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      1 /*
      2  * Copyright (C) 2006 The Android Open Source Project
      3  *
      4  * Licensed under the Apache License, Version 2.0 (the "License");
      5  * you may not use this file except in compliance with the License.
      6  * You may obtain a copy of the License at
      7  *
      8  *      http://www.apache.org/licenses/LICENSE-2.0
      9  *
     10  * Unless required by applicable law or agreed to in writing, software
     11  * distributed under the License is distributed on an "AS IS" BASIS,
     12  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
     13  * See the License for the specific language governing permissions and
     14  * limitations under the License.
     15  */
     16 
     17 package android.view;
     18 
     19 import android.content.ClipData;
     20 import android.content.Context;
     21 import android.content.res.Configuration;
     22 import android.content.res.Resources;
     23 import android.content.res.TypedArray;
     24 import android.graphics.Bitmap;
     25 import android.graphics.Camera;
     26 import android.graphics.Canvas;
     27 import android.graphics.Insets;
     28 import android.graphics.Interpolator;
     29 import android.graphics.LinearGradient;
     30 import android.graphics.Matrix;
     31 import android.graphics.Paint;
     32 import android.graphics.PixelFormat;
     33 import android.graphics.Point;
     34 import android.graphics.PorterDuff;
     35 import android.graphics.PorterDuffXfermode;
     36 import android.graphics.Rect;
     37 import android.graphics.RectF;
     38 import android.graphics.Region;
     39 import android.graphics.Shader;
     40 import android.graphics.drawable.ColorDrawable;
     41 import android.graphics.drawable.Drawable;
     42 import android.hardware.display.DisplayManagerGlobal;
     43 import android.os.Bundle;
     44 import android.os.Handler;
     45 import android.os.IBinder;
     46 import android.os.Parcel;
     47 import android.os.Parcelable;
     48 import android.os.RemoteException;
     49 import android.os.SystemClock;
     50 import android.os.SystemProperties;
     51 import android.text.TextUtils;
     52 import android.util.AttributeSet;
     53 import android.util.FloatProperty;
     54 import android.util.LayoutDirection;
     55 import android.util.Log;
     56 import android.util.LongSparseLongArray;
     57 import android.util.Pools.SynchronizedPool;
     58 import android.util.Property;
     59 import android.util.SparseArray;
     60 import android.util.SuperNotCalledException;
     61 import android.util.TypedValue;
     62 import android.view.ContextMenu.ContextMenuInfo;
     63 import android.view.AccessibilityIterators.TextSegmentIterator;
     64 import android.view.AccessibilityIterators.CharacterTextSegmentIterator;
     65 import android.view.AccessibilityIterators.WordTextSegmentIterator;
     66 import android.view.AccessibilityIterators.ParagraphTextSegmentIterator;
     67 import android.view.accessibility.AccessibilityEvent;
     68 import android.view.accessibility.AccessibilityEventSource;
     69 import android.view.accessibility.AccessibilityManager;
     70 import android.view.accessibility.AccessibilityNodeInfo;
     71 import android.view.accessibility.AccessibilityNodeProvider;
     72 import android.view.animation.Animation;
     73 import android.view.animation.AnimationUtils;
     74 import android.view.animation.Transformation;
     75 import android.view.inputmethod.EditorInfo;
     76 import android.view.inputmethod.InputConnection;
     77 import android.view.inputmethod.InputMethodManager;
     78 import android.widget.ScrollBarDrawable;
     79 
     80 import static android.os.Build.VERSION_CODES.*;
     81 import static java.lang.Math.max;
     82 
     83 import com.android.internal.R;
     84 import com.android.internal.util.Predicate;
     85 import com.android.internal.view.menu.MenuBuilder;
     86 import com.google.android.collect.Lists;
     87 import com.google.android.collect.Maps;
     88 
     89 import java.lang.ref.WeakReference;
     90 import java.lang.reflect.Field;
     91 import java.lang.reflect.InvocationTargetException;
     92 import java.lang.reflect.Method;
     93 import java.lang.reflect.Modifier;
     94 import java.util.ArrayList;
     95 import java.util.Arrays;
     96 import java.util.Collections;
     97 import java.util.HashMap;
     98 import java.util.Locale;
     99 import java.util.concurrent.CopyOnWriteArrayList;
    100 import java.util.concurrent.atomic.AtomicInteger;
    101 
    102 /**
    103  * <p>
    104  * This class represents the basic building block for user interface components. A View
    105  * occupies a rectangular area on the screen and is responsible for drawing and
    106  * event handling. View is the base class for <em>widgets</em>, which are
    107  * used to create interactive UI components (buttons, text fields, etc.). The
    108  * {@link android.view.ViewGroup} subclass is the base class for <em>layouts</em>, which
    109  * are invisible containers that hold other Views (or other ViewGroups) and define
    110  * their layout properties.
    111  * </p>
    112  *
    113  * <div class="special reference">
    114  * <h3>Developer Guides</h3>
    115  * <p>For information about using this class to develop your application's user interface,
    116  * read the <a href="{@docRoot}guide/topics/ui/index.html">User Interface</a> developer guide.
    117  * </div>
    118  *
    119  * <a name="Using"></a>
    120  * <h3>Using Views</h3>
    121  * <p>
    122  * All of the views in a window are arranged in a single tree. You can add views
    123  * either from code or by specifying a tree of views in one or more XML layout
    124  * files. There are many specialized subclasses of views that act as controls or
    125  * are capable of displaying text, images, or other content.
    126  * </p>
    127  * <p>
    128  * Once you have created a tree of views, there are typically a few types of
    129  * common operations you may wish to perform:
    130  * <ul>
    131  * <li><strong>Set properties:</strong> for example setting the text of a
    132  * {@link android.widget.TextView}. The available properties and the methods
    133  * that set them will vary among the different subclasses of views. Note that
    134  * properties that are known at build time can be set in the XML layout
    135  * files.</li>
    136  * <li><strong>Set focus:</strong> The framework will handled moving focus in
    137  * response to user input. To force focus to a specific view, call
    138  * {@link #requestFocus}.</li>
    139  * <li><strong>Set up listeners:</strong> Views allow clients to set listeners
    140  * that will be notified when something interesting happens to the view. For
    141  * example, all views will let you set a listener to be notified when the view
    142  * gains or loses focus. You can register such a listener using
    143  * {@link #setOnFocusChangeListener(android.view.View.OnFocusChangeListener)}.
    144  * Other view subclasses offer more specialized listeners. For example, a Button
    145  * exposes a listener to notify clients when the button is clicked.</li>
    146  * <li><strong>Set visibility:</strong> You can hide or show views using
    147  * {@link #setVisibility(int)}.</li>
    148  * </ul>
    149  * </p>
    150  * <p><em>
    151  * Note: The Android framework is responsible for measuring, laying out and
    152  * drawing views. You should not call methods that perform these actions on
    153  * views yourself unless you are actually implementing a
    154  * {@link android.view.ViewGroup}.
    155  * </em></p>
    156  *
    157  * <a name="Lifecycle"></a>
    158  * <h3>Implementing a Custom View</h3>
    159  *
    160  * <p>
    161  * To implement a custom view, you will usually begin by providing overrides for
    162  * some of the standard methods that the framework calls on all views. You do
    163  * not need to override all of these methods. In fact, you can start by just
    164  * overriding {@link #onDraw(android.graphics.Canvas)}.
    165  * <table border="2" width="85%" align="center" cellpadding="5">
    166  *     <thead>
    167  *         <tr><th>Category</th> <th>Methods</th> <th>Description</th></tr>
    168  *     </thead>
    169  *
    170  *     <tbody>
    171  *     <tr>
    172  *         <td rowspan="2">Creation</td>
    173  *         <td>Constructors</td>
    174  *         <td>There is a form of the constructor that are called when the view
    175  *         is created from code and a form that is called when the view is
    176  *         inflated from a layout file. The second form should parse and apply
    177  *         any attributes defined in the layout file.
    178  *         </td>
    179  *     </tr>
    180  *     <tr>
    181  *         <td><code>{@link #onFinishInflate()}</code></td>
    182  *         <td>Called after a view and all of its children has been inflated
    183  *         from XML.</td>
    184  *     </tr>
    185  *
    186  *     <tr>
    187  *         <td rowspan="3">Layout</td>
    188  *         <td><code>{@link #onMeasure(int, int)}</code></td>
    189  *         <td>Called to determine the size requirements for this view and all
    190  *         of its children.
    191  *         </td>
    192  *     </tr>
    193  *     <tr>
    194  *         <td><code>{@link #onLayout(boolean, int, int, int, int)}</code></td>
    195  *         <td>Called when this view should assign a size and position to all
    196  *         of its children.
    197  *         </td>
    198  *     </tr>
    199  *     <tr>
    200  *         <td><code>{@link #onSizeChanged(int, int, int, int)}</code></td>
    201  *         <td>Called when the size of this view has changed.
    202  *         </td>
    203  *     </tr>
    204  *
    205  *     <tr>
    206  *         <td>Drawing</td>
    207  *         <td><code>{@link #onDraw(android.graphics.Canvas)}</code></td>
    208  *         <td>Called when the view should render its content.
    209  *         </td>
    210  *     </tr>
    211  *
    212  *     <tr>
    213  *         <td rowspan="4">Event processing</td>
    214  *         <td><code>{@link #onKeyDown(int, KeyEvent)}</code></td>
    215  *         <td>Called when a new hardware key event occurs.
    216  *         </td>
    217  *     </tr>
    218  *     <tr>
    219  *         <td><code>{@link #onKeyUp(int, KeyEvent)}</code></td>
    220  *         <td>Called when a hardware key up event occurs.
    221  *         </td>
    222  *     </tr>
    223  *     <tr>
    224  *         <td><code>{@link #onTrackballEvent(MotionEvent)}</code></td>
    225  *         <td>Called when a trackball motion event occurs.
    226  *         </td>
    227  *     </tr>
    228  *     <tr>
    229  *         <td><code>{@link #onTouchEvent(MotionEvent)}</code></td>
    230  *         <td>Called when a touch screen motion event occurs.
    231  *         </td>
    232  *     </tr>
    233  *
    234  *     <tr>
    235  *         <td rowspan="2">Focus</td>
    236  *         <td><code>{@link #onFocusChanged(boolean, int, android.graphics.Rect)}</code></td>
    237  *         <td>Called when the view gains or loses focus.
    238  *         </td>
    239  *     </tr>
    240  *
    241  *     <tr>
    242  *         <td><code>{@link #onWindowFocusChanged(boolean)}</code></td>
    243  *         <td>Called when the window containing the view gains or loses focus.
    244  *         </td>
    245  *     </tr>
    246  *
    247  *     <tr>
    248  *         <td rowspan="3">Attaching</td>
    249  *         <td><code>{@link #onAttachedToWindow()}</code></td>
    250  *         <td>Called when the view is attached to a window.
    251  *         </td>
    252  *     </tr>
    253  *
    254  *     <tr>
    255  *         <td><code>{@link #onDetachedFromWindow}</code></td>
    256  *         <td>Called when the view is detached from its window.
    257  *         </td>
    258  *     </tr>
    259  *
    260  *     <tr>
    261  *         <td><code>{@link #onWindowVisibilityChanged(int)}</code></td>
    262  *         <td>Called when the visibility of the window containing the view
    263  *         has changed.
    264  *         </td>
    265  *     </tr>
    266  *     </tbody>
    267  *
    268  * </table>
    269  * </p>
    270  *
    271  * <a name="IDs"></a>
    272  * <h3>IDs</h3>
    273  * Views may have an integer id associated with them. These ids are typically
    274  * assigned in the layout XML files, and are used to find specific views within
    275  * the view tree. A common pattern is to:
    276  * <ul>
    277  * <li>Define a Button in the layout file and assign it a unique ID.
    278  * <pre>
    279  * &lt;Button
    280  *     android:id="@+id/my_button"
    281  *     android:layout_width="wrap_content"
    282  *     android:layout_height="wrap_content"
    283  *     android:text="@string/my_button_text"/&gt;
    284  * </pre></li>
    285  * <li>From the onCreate method of an Activity, find the Button
    286  * <pre class="prettyprint">
    287  *      Button myButton = (Button) findViewById(R.id.my_button);
    288  * </pre></li>
    289  * </ul>
    290  * <p>
    291  * View IDs need not be unique throughout the tree, but it is good practice to
    292  * ensure that they are at least unique within the part of the tree you are
    293  * searching.
    294  * </p>
    295  *
    296  * <a name="Position"></a>
    297  * <h3>Position</h3>
    298  * <p>
    299  * The geometry of a view is that of a rectangle. A view has a location,
    300  * expressed as a pair of <em>left</em> and <em>top</em> coordinates, and
    301  * two dimensions, expressed as a width and a height. The unit for location
    302  * and dimensions is the pixel.
    303  * </p>
    304  *
    305  * <p>
    306  * It is possible to retrieve the location of a view by invoking the methods
    307  * {@link #getLeft()} and {@link #getTop()}. The former returns the left, or X,
    308  * coordinate of the rectangle representing the view. The latter returns the
    309  * top, or Y, coordinate of the rectangle representing the view. These methods
    310  * both return the location of the view relative to its parent. For instance,
    311  * when getLeft() returns 20, that means the view is located 20 pixels to the
    312  * right of the left edge of its direct parent.
    313  * </p>
    314  *
    315  * <p>
    316  * In addition, several convenience methods are offered to avoid unnecessary
    317  * computations, namely {@link #getRight()} and {@link #getBottom()}.
    318  * These methods return the coordinates of the right and bottom edges of the
    319  * rectangle representing the view. For instance, calling {@link #getRight()}
    320  * is similar to the following computation: <code>getLeft() + getWidth()</code>
    321  * (see <a href="#SizePaddingMargins">Size</a> for more information about the width.)
    322  * </p>
    323  *
    324  * <a name="SizePaddingMargins"></a>
    325  * <h3>Size, padding and margins</h3>
    326  * <p>
    327  * The size of a view is expressed with a width and a height. A view actually
    328  * possess two pairs of width and height values.
    329  * </p>
    330  *
    331  * <p>
    332  * The first pair is known as <em>measured width</em> and
    333  * <em>measured height</em>. These dimensions define how big a view wants to be
    334  * within its parent (see <a href="#Layout">Layout</a> for more details.) The
    335  * measured dimensions can be obtained by calling {@link #getMeasuredWidth()}
    336  * and {@link #getMeasuredHeight()}.
    337  * </p>
    338  *
    339  * <p>
    340  * The second pair is simply known as <em>width</em> and <em>height</em>, or
    341  * sometimes <em>drawing width</em> and <em>drawing height</em>. These
    342  * dimensions define the actual size of the view on screen, at drawing time and
    343  * after layout. These values may, but do not have to, be different from the
    344  * measured width and height. The width and height can be obtained by calling
    345  * {@link #getWidth()} and {@link #getHeight()}.
    346  * </p>
    347  *
    348  * <p>
    349  * To measure its dimensions, a view takes into account its padding. The padding
    350  * is expressed in pixels for the left, top, right and bottom parts of the view.
    351  * Padding can be used to offset the content of the view by a specific amount of
    352  * pixels. For instance, a left padding of 2 will push the view's content by
    353  * 2 pixels to the right of the left edge. Padding can be set using the
    354  * {@link #setPadding(int, int, int, int)} or {@link #setPaddingRelative(int, int, int, int)}
    355  * method and queried by calling {@link #getPaddingLeft()}, {@link #getPaddingTop()},
    356  * {@link #getPaddingRight()}, {@link #getPaddingBottom()}, {@link #getPaddingStart()},
    357  * {@link #getPaddingEnd()}.
    358  * </p>
    359  *
    360  * <p>
    361  * Even though a view can define a padding, it does not provide any support for
    362  * margins. However, view groups provide such a support. Refer to
    363  * {@link android.view.ViewGroup} and
    364  * {@link android.view.ViewGroup.MarginLayoutParams} for further information.
    365  * </p>
    366  *
    367  * <a name="Layout"></a>
    368  * <h3>Layout</h3>
    369  * <p>
    370  * Layout is a two pass process: a measure pass and a layout pass. The measuring
    371  * pass is implemented in {@link #measure(int, int)} and is a top-down traversal
    372  * of the view tree. Each view pushes dimension specifications down the tree
    373  * during the recursion. At the end of the measure pass, every view has stored
    374  * its measurements. The second pass happens in
    375  * {@link #layout(int,int,int,int)} and is also top-down. During
    376  * this pass each parent is responsible for positioning all of its children
    377  * using the sizes computed in the measure pass.
    378  * </p>
    379  *
    380  * <p>
    381  * When a view's measure() method returns, its {@link #getMeasuredWidth()} and
    382  * {@link #getMeasuredHeight()} values must be set, along with those for all of
    383  * that view's descendants. A view's measured width and measured height values
    384  * must respect the constraints imposed by the view's parents. This guarantees
    385  * that at the end of the measure pass, all parents accept all of their
    386  * children's measurements. A parent view may call measure() more than once on
    387  * its children. For example, the parent may measure each child once with
    388  * unspecified dimensions to find out how big they want to be, then call
    389  * measure() on them again with actual numbers if the sum of all the children's
    390  * unconstrained sizes is too big or too small.
    391  * </p>
    392  *
    393  * <p>
    394  * The measure pass uses two classes to communicate dimensions. The
    395  * {@link MeasureSpec} class is used by views to tell their parents how they
    396  * want to be measured and positioned. The base LayoutParams class just
    397  * describes how big the view wants to be for both width and height. For each
    398  * dimension, it can specify one of:
    399  * <ul>
    400  * <li> an exact number
    401  * <li>MATCH_PARENT, which means the view wants to be as big as its parent
    402  * (minus padding)
    403  * <li> WRAP_CONTENT, which means that the view wants to be just big enough to
    404  * enclose its content (plus padding).
    405  * </ul>
    406  * There are subclasses of LayoutParams for different subclasses of ViewGroup.
    407  * For example, AbsoluteLayout has its own subclass of LayoutParams which adds
    408  * an X and Y value.
    409  * </p>
    410  *
    411  * <p>
    412  * MeasureSpecs are used to push requirements down the tree from parent to
    413  * child. A MeasureSpec can be in one of three modes:
    414  * <ul>
    415  * <li>UNSPECIFIED: This is used by a parent to determine the desired dimension
    416  * of a child view. For example, a LinearLayout may call measure() on its child
    417  * with the height set to UNSPECIFIED and a width of EXACTLY 240 to find out how
    418  * tall the child view wants to be given a width of 240 pixels.
    419  * <li>EXACTLY: This is used by the parent to impose an exact size on the
    420  * child. The child must use this size, and guarantee that all of its
    421  * descendants will fit within this size.
    422  * <li>AT_MOST: This is used by the parent to impose a maximum size on the
    423  * child. The child must gurantee that it and all of its descendants will fit
    424  * within this size.
    425  * </ul>
    426  * </p>
    427  *
    428  * <p>
    429  * To intiate a layout, call {@link #requestLayout}. This method is typically
    430  * called by a view on itself when it believes that is can no longer fit within
    431  * its current bounds.
    432  * </p>
    433  *
    434  * <a name="Drawing"></a>
    435  * <h3>Drawing</h3>
    436  * <p>
    437  * Drawing is handled by walking the tree and rendering each view that
    438  * intersects the invalid region. Because the tree is traversed in-order,
    439  * this means that parents will draw before (i.e., behind) their children, with
    440  * siblings drawn in the order they appear in the tree.
    441  * If you set a background drawable for a View, then the View will draw it for you
    442  * before calling back to its <code>onDraw()</code> method.
    443  * </p>
    444  *
    445  * <p>
    446  * Note that the framework will not draw views that are not in the invalid region.
    447  * </p>
    448  *
    449  * <p>
    450  * To force a view to draw, call {@link #invalidate()}.
    451  * </p>
    452  *
    453  * <a name="EventHandlingThreading"></a>
    454  * <h3>Event Handling and Threading</h3>
    455  * <p>
    456  * The basic cycle of a view is as follows:
    457  * <ol>
    458  * <li>An event comes in and is dispatched to the appropriate view. The view
    459  * handles the event and notifies any listeners.</li>
    460  * <li>If in the course of processing the event, the view's bounds may need
    461  * to be changed, the view will call {@link #requestLayout()}.</li>
    462  * <li>Similarly, if in the course of processing the event the view's appearance
    463  * may need to be changed, the view will call {@link #invalidate()}.</li>
    464  * <li>If either {@link #requestLayout()} or {@link #invalidate()} were called,
    465  * the framework will take care of measuring, laying out, and drawing the tree
    466  * as appropriate.</li>
    467  * </ol>
    468  * </p>
    469  *
    470  * <p><em>Note: The entire view tree is single threaded. You must always be on
    471  * the UI thread when calling any method on any view.</em>
    472  * If you are doing work on other threads and want to update the state of a view
    473  * from that thread, you should use a {@link Handler}.
    474  * </p>
    475  *
    476  * <a name="FocusHandling"></a>
    477  * <h3>Focus Handling</h3>
    478  * <p>
    479  * The framework will handle routine focus movement in response to user input.
    480  * This includes changing the focus as views are removed or hidden, or as new
    481  * views become available. Views indicate their willingness to take focus
    482  * through the {@link #isFocusable} method. To change whether a view can take
    483  * focus, call {@link #setFocusable(boolean)}.  When in touch mode (see notes below)
    484  * views indicate whether they still would like focus via {@link #isFocusableInTouchMode}
    485  * and can change this via {@link #setFocusableInTouchMode(boolean)}.
    486  * </p>
    487  * <p>
    488  * Focus movement is based on an algorithm which finds the nearest neighbor in a
    489  * given direction. In rare cases, the default algorithm may not match the
    490  * intended behavior of the developer. In these situations, you can provide
    491  * explicit overrides by using these XML attributes in the layout file:
    492  * <pre>
    493  * nextFocusDown
    494  * nextFocusLeft
    495  * nextFocusRight
    496  * nextFocusUp
    497  * </pre>
    498  * </p>
    499  *
    500  *
    501  * <p>
    502  * To get a particular view to take focus, call {@link #requestFocus()}.
    503  * </p>
    504  *
    505  * <a name="TouchMode"></a>
    506  * <h3>Touch Mode</h3>
    507  * <p>
    508  * When a user is navigating a user interface via directional keys such as a D-pad, it is
    509  * necessary to give focus to actionable items such as buttons so the user can see
    510  * what will take input.  If the device has touch capabilities, however, and the user
    511  * begins interacting with the interface by touching it, it is no longer necessary to
    512  * always highlight, or give focus to, a particular view.  This motivates a mode
    513  * for interaction named 'touch mode'.
    514  * </p>
    515  * <p>
    516  * For a touch capable device, once the user touches the screen, the device
    517  * will enter touch mode.  From this point onward, only views for which
    518  * {@link #isFocusableInTouchMode} is true will be focusable, such as text editing widgets.
    519  * Other views that are touchable, like buttons, will not take focus when touched; they will
    520  * only fire the on click listeners.
    521  * </p>
    522  * <p>
    523  * Any time a user hits a directional key, such as a D-pad direction, the view device will
    524  * exit touch mode, and find a view to take focus, so that the user may resume interacting
    525  * with the user interface without touching the screen again.
    526  * </p>
    527  * <p>
    528  * The touch mode state is maintained across {@link android.app.Activity}s.  Call
    529  * {@link #isInTouchMode} to see whether the device is currently in touch mode.
    530  * </p>
    531  *
    532  * <a name="Scrolling"></a>
    533  * <h3>Scrolling</h3>
    534  * <p>
    535  * The framework provides basic support for views that wish to internally
    536  * scroll their content. This includes keeping track of the X and Y scroll
    537  * offset as well as mechanisms for drawing scrollbars. See
    538  * {@link #scrollBy(int, int)}, {@link #scrollTo(int, int)}, and
    539  * {@link #awakenScrollBars()} for more details.
    540  * </p>
    541  *
    542  * <a name="Tags"></a>
    543  * <h3>Tags</h3>
    544  * <p>
    545  * Unlike IDs, tags are not used to identify views. Tags are essentially an
    546  * extra piece of information that can be associated with a view. They are most
    547  * often used as a convenience to store data related to views in the views
    548  * themselves rather than by putting them in a separate structure.
    549  * </p>
    550  *
    551  * <a name="Properties"></a>
    552  * <h3>Properties</h3>
    553  * <p>
    554  * The View class exposes an {@link #ALPHA} property, as well as several transform-related
    555  * properties, such as {@link #TRANSLATION_X} and {@link #TRANSLATION_Y}. These properties are
    556  * available both in the {@link Property} form as well as in similarly-named setter/getter
    557  * methods (such as {@link #setAlpha(float)} for {@link #ALPHA}). These properties can
    558  * be used to set persistent state associated with these rendering-related properties on the view.
    559  * The properties and methods can also be used in conjunction with
    560  * {@link android.animation.Animator Animator}-based animations, described more in the
    561  * <a href="#Animation">Animation</a> section.
    562  * </p>
    563  *
    564  * <a name="Animation"></a>
    565  * <h3>Animation</h3>
    566  * <p>
    567  * Starting with Android 3.0, the preferred way of animating views is to use the
    568  * {@link android.animation} package APIs. These {@link android.animation.Animator Animator}-based
    569  * classes change actual properties of the View object, such as {@link #setAlpha(float) alpha} and
    570  * {@link #setTranslationX(float) translationX}. This behavior is contrasted to that of the pre-3.0
    571  * {@link android.view.animation.Animation Animation}-based classes, which instead animate only
    572  * how the view is drawn on the display. In particular, the {@link ViewPropertyAnimator} class
    573  * makes animating these View properties particularly easy and efficient.
    574  * </p>
    575  * <p>
    576  * Alternatively, you can use the pre-3.0 animation classes to animate how Views are rendered.
    577  * You can attach an {@link Animation} object to a view using
    578  * {@link #setAnimation(Animation)} or
    579  * {@link #startAnimation(Animation)}. The animation can alter the scale,
    580  * rotation, translation and alpha of a view over time. If the animation is
    581  * attached to a view that has children, the animation will affect the entire
    582  * subtree rooted by that node. When an animation is started, the framework will
    583  * take care of redrawing the appropriate views until the animation completes.
    584  * </p>
    585  *
    586  * <a name="Security"></a>
    587  * <h3>Security</h3>
    588  * <p>
    589  * Sometimes it is essential that an application be able to verify that an action
    590  * is being performed with the full knowledge and consent of the user, such as
    591  * granting a permission request, making a purchase or clicking on an advertisement.
    592  * Unfortunately, a malicious application could try to spoof the user into
    593  * performing these actions, unaware, by concealing the intended purpose of the view.
    594  * As a remedy, the framework offers a touch filtering mechanism that can be used to
    595  * improve the security of views that provide access to sensitive functionality.
    596  * </p><p>
    597  * To enable touch filtering, call {@link #setFilterTouchesWhenObscured(boolean)} or set the
    598  * android:filterTouchesWhenObscured layout attribute to true.  When enabled, the framework
    599  * will discard touches that are received whenever the view's window is obscured by
    600  * another visible window.  As a result, the view will not receive touches whenever a
    601  * toast, dialog or other window appears above the view's window.
    602  * </p><p>
    603  * For more fine-grained control over security, consider overriding the
    604  * {@link #onFilterTouchEventForSecurity(MotionEvent)} method to implement your own
    605  * security policy. See also {@link MotionEvent#FLAG_WINDOW_IS_OBSCURED}.
    606  * </p>
    607  *
    608  * @attr ref android.R.styleable#View_alpha
    609  * @attr ref android.R.styleable#View_background
    610  * @attr ref android.R.styleable#View_clickable
    611  * @attr ref android.R.styleable#View_contentDescription
    612  * @attr ref android.R.styleable#View_drawingCacheQuality
    613  * @attr ref android.R.styleable#View_duplicateParentState
    614  * @attr ref android.R.styleable#View_id
    615  * @attr ref android.R.styleable#View_requiresFadingEdge
    616  * @attr ref android.R.styleable#View_fadeScrollbars
    617  * @attr ref android.R.styleable#View_fadingEdgeLength
    618  * @attr ref android.R.styleable#View_filterTouchesWhenObscured
    619  * @attr ref android.R.styleable#View_fitsSystemWindows
    620  * @attr ref android.R.styleable#View_isScrollContainer
    621  * @attr ref android.R.styleable#View_focusable
    622  * @attr ref android.R.styleable#View_focusableInTouchMode
    623  * @attr ref android.R.styleable#View_hapticFeedbackEnabled
    624  * @attr ref android.R.styleable#View_keepScreenOn
    625  * @attr ref android.R.styleable#View_layerType
    626  * @attr ref android.R.styleable#View_layoutDirection
    627  * @attr ref android.R.styleable#View_longClickable
    628  * @attr ref android.R.styleable#View_minHeight
    629  * @attr ref android.R.styleable#View_minWidth
    630  * @attr ref android.R.styleable#View_nextFocusDown
    631  * @attr ref android.R.styleable#View_nextFocusLeft
    632  * @attr ref android.R.styleable#View_nextFocusRight
    633  * @attr ref android.R.styleable#View_nextFocusUp
    634  * @attr ref android.R.styleable#View_onClick
    635  * @attr ref android.R.styleable#View_padding
    636  * @attr ref android.R.styleable#View_paddingBottom
    637  * @attr ref android.R.styleable#View_paddingLeft
    638  * @attr ref android.R.styleable#View_paddingRight
    639  * @attr ref android.R.styleable#View_paddingTop
    640  * @attr ref android.R.styleable#View_paddingStart
    641  * @attr ref android.R.styleable#View_paddingEnd
    642  * @attr ref android.R.styleable#View_saveEnabled
    643  * @attr ref android.R.styleable#View_rotation
    644  * @attr ref android.R.styleable#View_rotationX
    645  * @attr ref android.R.styleable#View_rotationY
    646  * @attr ref android.R.styleable#View_scaleX
    647  * @attr ref android.R.styleable#View_scaleY
    648  * @attr ref android.R.styleable#View_scrollX
    649  * @attr ref android.R.styleable#View_scrollY
    650  * @attr ref android.R.styleable#View_scrollbarSize
    651  * @attr ref android.R.styleable#View_scrollbarStyle
    652  * @attr ref android.R.styleable#View_scrollbars
    653  * @attr ref android.R.styleable#View_scrollbarDefaultDelayBeforeFade
    654  * @attr ref android.R.styleable#View_scrollbarFadeDuration
    655  * @attr ref android.R.styleable#View_scrollbarTrackHorizontal
    656  * @attr ref android.R.styleable#View_scrollbarThumbHorizontal
    657  * @attr ref android.R.styleable#View_scrollbarThumbVertical
    658  * @attr ref android.R.styleable#View_scrollbarTrackVertical
    659  * @attr ref android.R.styleable#View_scrollbarAlwaysDrawHorizontalTrack
    660  * @attr ref android.R.styleable#View_scrollbarAlwaysDrawVerticalTrack
    661  * @attr ref android.R.styleable#View_soundEffectsEnabled
    662  * @attr ref android.R.styleable#View_tag
    663  * @attr ref android.R.styleable#View_textAlignment
    664  * @attr ref android.R.styleable#View_textDirection
    665  * @attr ref android.R.styleable#View_transformPivotX
    666  * @attr ref android.R.styleable#View_transformPivotY
    667  * @attr ref android.R.styleable#View_translationX
    668  * @attr ref android.R.styleable#View_translationY
    669  * @attr ref android.R.styleable#View_visibility
    670  *
    671  * @see android.view.ViewGroup
    672  */
    673 public class View implements Drawable.Callback, KeyEvent.Callback,
    674         AccessibilityEventSource {
    675     private static final boolean DBG = false;
    676 
    677     /**
    678      * The logging tag used by this class with android.util.Log.
    679      */
    680     protected static final String VIEW_LOG_TAG = "View";
    681 
    682     /**
    683      * When set to true, apps will draw debugging information about their layouts.
    684      *
    685      * @hide
    686      */
    687     public static final String DEBUG_LAYOUT_PROPERTY = "debug.layout";
    688 
    689     /**
    690      * Used to mark a View that has no ID.
    691      */
    692     public static final int NO_ID = -1;
    693 
    694     /**
    695      * Signals that compatibility booleans have been initialized according to
    696      * target SDK versions.
    697      */
    698     private static boolean sCompatibilityDone = false;
    699 
    700     /**
    701      * Use the old (broken) way of building MeasureSpecs.
    702      */
    703     private static boolean sUseBrokenMakeMeasureSpec = false;
    704 
    705     /**
    706      * Ignore any optimizations using the measure cache.
    707      */
    708     private static boolean sIgnoreMeasureCache = false;
    709 
    710     /**
    711      * This view does not want keystrokes. Use with TAKES_FOCUS_MASK when
    712      * calling setFlags.
    713      */
    714     private static final int NOT_FOCUSABLE = 0x00000000;
    715 
    716     /**
    717      * This view wants keystrokes. Use with TAKES_FOCUS_MASK when calling
    718      * setFlags.
    719      */
    720     private static final int FOCUSABLE = 0x00000001;
    721 
    722     /**
    723      * Mask for use with setFlags indicating bits used for focus.
    724      */
    725     private static final int FOCUSABLE_MASK = 0x00000001;
    726 
    727     /**
    728      * This view will adjust its padding to fit sytem windows (e.g. status bar)
    729      */
    730     private static final int FITS_SYSTEM_WINDOWS = 0x00000002;
    731 
    732     /**
    733      * This view is visible.
    734      * Use with {@link #setVisibility} and <a href="#attr_android:visibility">{@code
    735      * android:visibility}.
    736      */
    737     public static final int VISIBLE = 0x00000000;
    738 
    739     /**
    740      * This view is invisible, but it still takes up space for layout purposes.
    741      * Use with {@link #setVisibility} and <a href="#attr_android:visibility">{@code
    742      * android:visibility}.
    743      */
    744     public static final int INVISIBLE = 0x00000004;
    745 
    746     /**
    747      * This view is invisible, and it doesn't take any space for layout
    748      * purposes. Use with {@link #setVisibility} and <a href="#attr_android:visibility">{@code
    749      * android:visibility}.
    750      */
    751     public static final int GONE = 0x00000008;
    752 
    753     /**
    754      * Mask for use with setFlags indicating bits used for visibility.
    755      * {@hide}
    756      */
    757     static final int VISIBILITY_MASK = 0x0000000C;
    758 
    759     private static final int[] VISIBILITY_FLAGS = {VISIBLE, INVISIBLE, GONE};
    760 
    761     /**
    762      * This view is enabled. Interpretation varies by subclass.
    763      * Use with ENABLED_MASK when calling setFlags.
    764      * {@hide}
    765      */
    766     static final int ENABLED = 0x00000000;
    767 
    768     /**
    769      * This view is disabled. Interpretation varies by subclass.
    770      * Use with ENABLED_MASK when calling setFlags.
    771      * {@hide}
    772      */
    773     static final int DISABLED = 0x00000020;
    774 
    775    /**
    776     * Mask for use with setFlags indicating bits used for indicating whether
    777     * this view is enabled
    778     * {@hide}
    779     */
    780     static final int ENABLED_MASK = 0x00000020;
    781 
    782     /**
    783      * This view won't draw. {@link #onDraw(android.graphics.Canvas)} won't be
    784      * called and further optimizations will be performed. It is okay to have
    785      * this flag set and a background. Use with DRAW_MASK when calling setFlags.
    786      * {@hide}
    787      */
    788     static final int WILL_NOT_DRAW = 0x00000080;
    789 
    790     /**
    791      * Mask for use with setFlags indicating bits used for indicating whether
    792      * this view is will draw
    793      * {@hide}
    794      */
    795     static final int DRAW_MASK = 0x00000080;
    796 
    797     /**
    798      * <p>This view doesn't show scrollbars.</p>
    799      * {@hide}
    800      */
    801     static final int SCROLLBARS_NONE = 0x00000000;
    802 
    803     /**
    804      * <p>This view shows horizontal scrollbars.</p>
    805      * {@hide}
    806      */
    807     static final int SCROLLBARS_HORIZONTAL = 0x00000100;
    808 
    809     /**
    810      * <p>This view shows vertical scrollbars.</p>
    811      * {@hide}
    812      */
    813     static final int SCROLLBARS_VERTICAL = 0x00000200;
    814 
    815     /**
    816      * <p>Mask for use with setFlags indicating bits used for indicating which
    817      * scrollbars are enabled.</p>
    818      * {@hide}
    819      */
    820     static final int SCROLLBARS_MASK = 0x00000300;
    821 
    822     /**
    823      * Indicates that the view should filter touches when its window is obscured.
    824      * Refer to the class comments for more information about this security feature.
    825      * {@hide}
    826      */
    827     static final int FILTER_TOUCHES_WHEN_OBSCURED = 0x00000400;
    828 
    829     /**
    830      * Set for framework elements that use FITS_SYSTEM_WINDOWS, to indicate
    831      * that they are optional and should be skipped if the window has
    832      * requested system UI flags that ignore those insets for layout.
    833      */
    834     static final int OPTIONAL_FITS_SYSTEM_WINDOWS = 0x00000800;
    835 
    836     /**
    837      * <p>This view doesn't show fading edges.</p>
    838      * {@hide}
    839      */
    840     static final int FADING_EDGE_NONE = 0x00000000;
    841 
    842     /**
    843      * <p>This view shows horizontal fading edges.</p>
    844      * {@hide}
    845      */
    846     static final int FADING_EDGE_HORIZONTAL = 0x00001000;
    847 
    848     /**
    849      * <p>This view shows vertical fading edges.</p>
    850      * {@hide}
    851      */
    852     static final int FADING_EDGE_VERTICAL = 0x00002000;
    853 
    854     /**
    855      * <p>Mask for use with setFlags indicating bits used for indicating which
    856      * fading edges are enabled.</p>
    857      * {@hide}
    858      */
    859     static final int FADING_EDGE_MASK = 0x00003000;
    860 
    861     /**
    862      * <p>Indicates this view can be clicked. When clickable, a View reacts
    863      * to clicks by notifying the OnClickListener.<p>
    864      * {@hide}
    865      */
    866     static final int CLICKABLE = 0x00004000;
    867 
    868     /**
    869      * <p>Indicates this view is caching its drawing into a bitmap.</p>
    870      * {@hide}
    871      */
    872     static final int DRAWING_CACHE_ENABLED = 0x00008000;
    873 
    874     /**
    875      * <p>Indicates that no icicle should be saved for this view.<p>
    876      * {@hide}
    877      */
    878     static final int SAVE_DISABLED = 0x000010000;
    879 
    880     /**
    881      * <p>Mask for use with setFlags indicating bits used for the saveEnabled
    882      * property.</p>
    883      * {@hide}
    884      */
    885     static final int SAVE_DISABLED_MASK = 0x000010000;
    886 
    887     /**
    888      * <p>Indicates that no drawing cache should ever be created for this view.<p>
    889      * {@hide}
    890      */
    891     static final int WILL_NOT_CACHE_DRAWING = 0x000020000;
    892 
    893     /**
    894      * <p>Indicates this view can take / keep focus when int touch mode.</p>
    895      * {@hide}
    896      */
    897     static final int FOCUSABLE_IN_TOUCH_MODE = 0x00040000;
    898 
    899     /**
    900      * <p>Enables low quality mode for the drawing cache.</p>
    901      */
    902     public static final int DRAWING_CACHE_QUALITY_LOW = 0x00080000;
    903 
    904     /**
    905      * <p>Enables high quality mode for the drawing cache.</p>
    906      */
    907     public static final int DRAWING_CACHE_QUALITY_HIGH = 0x00100000;
    908 
    909     /**
    910      * <p>Enables automatic quality mode for the drawing cache.</p>
    911      */
    912     public static final int DRAWING_CACHE_QUALITY_AUTO = 0x00000000;
    913 
    914     private static final int[] DRAWING_CACHE_QUALITY_FLAGS = {
    915             DRAWING_CACHE_QUALITY_AUTO, DRAWING_CACHE_QUALITY_LOW, DRAWING_CACHE_QUALITY_HIGH
    916     };
    917 
    918     /**
    919      * <p>Mask for use with setFlags indicating bits used for the cache
    920      * quality property.</p>
    921      * {@hide}
    922      */
    923     static final int DRAWING_CACHE_QUALITY_MASK = 0x00180000;
    924 
    925     /**
    926      * <p>
    927      * Indicates this view can be long clicked. When long clickable, a View
    928      * reacts to long clicks by notifying the OnLongClickListener or showing a
    929      * context menu.
    930      * </p>
    931      * {@hide}
    932      */
    933     static final int LONG_CLICKABLE = 0x00200000;
    934 
    935     /**
    936      * <p>Indicates that this view gets its drawable states from its direct parent
    937      * and ignores its original internal states.</p>
    938      *
    939      * @hide
    940      */
    941     static final int DUPLICATE_PARENT_STATE = 0x00400000;
    942 
    943     /**
    944      * The scrollbar style to display the scrollbars inside the content area,
    945      * without increasing the padding. The scrollbars will be overlaid with
    946      * translucency on the view's content.
    947      */
    948     public static final int SCROLLBARS_INSIDE_OVERLAY = 0;
    949 
    950     /**
    951      * The scrollbar style to display the scrollbars inside the padded area,
    952      * increasing the padding of the view. The scrollbars will not overlap the
    953      * content area of the view.
    954      */
    955     public static final int SCROLLBARS_INSIDE_INSET = 0x01000000;
    956 
    957     /**
    958      * The scrollbar style to display the scrollbars at the edge of the view,
    959      * without increasing the padding. The scrollbars will be overlaid with
    960      * translucency.
    961      */
    962     public static final int SCROLLBARS_OUTSIDE_OVERLAY = 0x02000000;
    963 
    964     /**
    965      * The scrollbar style to display the scrollbars at the edge of the view,
    966      * increasing the padding of the view. The scrollbars will only overlap the
    967      * background, if any.
    968      */
    969     public static final int SCROLLBARS_OUTSIDE_INSET = 0x03000000;
    970 
    971     /**
    972      * Mask to check if the scrollbar style is overlay or inset.
    973      * {@hide}
    974      */
    975     static final int SCROLLBARS_INSET_MASK = 0x01000000;
    976 
    977     /**
    978      * Mask to check if the scrollbar style is inside or outside.
    979      * {@hide}
    980      */
    981     static final int SCROLLBARS_OUTSIDE_MASK = 0x02000000;
    982 
    983     /**
    984      * Mask for scrollbar style.
    985      * {@hide}
    986      */
    987     static final int SCROLLBARS_STYLE_MASK = 0x03000000;
    988 
    989     /**
    990      * View flag indicating that the screen should remain on while the
    991      * window containing this view is visible to the user.  This effectively
    992      * takes care of automatically setting the WindowManager's
    993      * {@link WindowManager.LayoutParams#FLAG_KEEP_SCREEN_ON}.
    994      */
    995     public static final int KEEP_SCREEN_ON = 0x04000000;
    996 
    997     /**
    998      * View flag indicating whether this view should have sound effects enabled
    999      * for events such as clicking and touching.
   1000      */
   1001     public static final int SOUND_EFFECTS_ENABLED = 0x08000000;
   1002 
   1003     /**
   1004      * View flag indicating whether this view should have haptic feedback
   1005      * enabled for events such as long presses.
   1006      */
   1007     public static final int HAPTIC_FEEDBACK_ENABLED = 0x10000000;
   1008 
   1009     /**
   1010      * <p>Indicates that the view hierarchy should stop saving state when
   1011      * it reaches this view.  If state saving is initiated immediately at
   1012      * the view, it will be allowed.
   1013      * {@hide}
   1014      */
   1015     static final int PARENT_SAVE_DISABLED = 0x20000000;
   1016 
   1017     /**
   1018      * <p>Mask for use with setFlags indicating bits used for PARENT_SAVE_DISABLED.</p>
   1019      * {@hide}
   1020      */
   1021     static final int PARENT_SAVE_DISABLED_MASK = 0x20000000;
   1022 
   1023     /**
   1024      * View flag indicating whether {@link #addFocusables(ArrayList, int, int)}
   1025      * should add all focusable Views regardless if they are focusable in touch mode.
   1026      */
   1027     public static final int FOCUSABLES_ALL = 0x00000000;
   1028 
   1029     /**
   1030      * View flag indicating whether {@link #addFocusables(ArrayList, int, int)}
   1031      * should add only Views focusable in touch mode.
   1032      */
   1033     public static final int FOCUSABLES_TOUCH_MODE = 0x00000001;
   1034 
   1035     /**
   1036      * Use with {@link #focusSearch(int)}. Move focus to the previous selectable
   1037      * item.
   1038      */
   1039     public static final int FOCUS_BACKWARD = 0x00000001;
   1040 
   1041     /**
   1042      * Use with {@link #focusSearch(int)}. Move focus to the next selectable
   1043      * item.
   1044      */
   1045     public static final int FOCUS_FORWARD = 0x00000002;
   1046 
   1047     /**
   1048      * Use with {@link #focusSearch(int)}. Move focus to the left.
   1049      */
   1050     public static final int FOCUS_LEFT = 0x00000011;
   1051 
   1052     /**
   1053      * Use with {@link #focusSearch(int)}. Move focus up.
   1054      */
   1055     public static final int FOCUS_UP = 0x00000021;
   1056 
   1057     /**
   1058      * Use with {@link #focusSearch(int)}. Move focus to the right.
   1059      */
   1060     public static final int FOCUS_RIGHT = 0x00000042;
   1061 
   1062     /**
   1063      * Use with {@link #focusSearch(int)}. Move focus down.
   1064      */
   1065     public static final int FOCUS_DOWN = 0x00000082;
   1066 
   1067     /**
   1068      * Bits of {@link #getMeasuredWidthAndState()} and
   1069      * {@link #getMeasuredWidthAndState()} that provide the actual measured size.
   1070      */
   1071     public static final int MEASURED_SIZE_MASK = 0x00ffffff;
   1072 
   1073     /**
   1074      * Bits of {@link #getMeasuredWidthAndState()} and
   1075      * {@link #getMeasuredWidthAndState()} that provide the additional state bits.
   1076      */
   1077     public static final int MEASURED_STATE_MASK = 0xff000000;
   1078 
   1079     /**
   1080      * Bit shift of {@link #MEASURED_STATE_MASK} to get to the height bits
   1081      * for functions that combine both width and height into a single int,
   1082      * such as {@link #getMeasuredState()} and the childState argument of
   1083      * {@link #resolveSizeAndState(int, int, int)}.
   1084      */
   1085     public static final int MEASURED_HEIGHT_STATE_SHIFT = 16;
   1086 
   1087     /**
   1088      * Bit of {@link #getMeasuredWidthAndState()} and
   1089      * {@link #getMeasuredWidthAndState()} that indicates the measured size
   1090      * is smaller that the space the view would like to have.
   1091      */
   1092     public static final int MEASURED_STATE_TOO_SMALL = 0x01000000;
   1093 
   1094     /**
   1095      * Base View state sets
   1096      */
   1097     // Singles
   1098     /**
   1099      * Indicates the view has no states set. States are used with
   1100      * {@link android.graphics.drawable.Drawable} to change the drawing of the
   1101      * view depending on its state.
   1102      *
   1103      * @see android.graphics.drawable.Drawable
   1104      * @see #getDrawableState()
   1105      */
   1106     protected static final int[] EMPTY_STATE_SET;
   1107     /**
   1108      * Indicates the view is enabled. States are used with
   1109      * {@link android.graphics.drawable.Drawable} to change the drawing of the
   1110      * view depending on its state.
   1111      *
   1112      * @see android.graphics.drawable.Drawable
   1113      * @see #getDrawableState()
   1114      */
   1115     protected static final int[] ENABLED_STATE_SET;
   1116     /**
   1117      * Indicates the view is focused. States are used with
   1118      * {@link android.graphics.drawable.Drawable} to change the drawing of the
   1119      * view depending on its state.
   1120      *
   1121      * @see android.graphics.drawable.Drawable
   1122      * @see #getDrawableState()
   1123      */
   1124     protected static final int[] FOCUSED_STATE_SET;
   1125     /**
   1126      * Indicates the view is selected. States are used with
   1127      * {@link android.graphics.drawable.Drawable} to change the drawing of the
   1128      * view depending on its state.
   1129      *
   1130      * @see android.graphics.drawable.Drawable
   1131      * @see #getDrawableState()
   1132      */
   1133     protected static final int[] SELECTED_STATE_SET;
   1134     /**
   1135      * Indicates the view is pressed. States are used with
   1136      * {@link android.graphics.drawable.Drawable} to change the drawing of the
   1137      * view depending on its state.
   1138      *
   1139      * @see android.graphics.drawable.Drawable
   1140      * @see #getDrawableState()
   1141      */
   1142     protected static final int[] PRESSED_STATE_SET;
   1143     /**
   1144      * Indicates the view's window has focus. States are used with
   1145      * {@link android.graphics.drawable.Drawable} to change the drawing of the
   1146      * view depending on its state.
   1147      *
   1148      * @see android.graphics.drawable.Drawable
   1149      * @see #getDrawableState()
   1150      */
   1151     protected static final int[] WINDOW_FOCUSED_STATE_SET;
   1152     // Doubles
   1153     /**
   1154      * Indicates the view is enabled and has the focus.
   1155      *
   1156      * @see #ENABLED_STATE_SET
   1157      * @see #FOCUSED_STATE_SET
   1158      */
   1159     protected static final int[] ENABLED_FOCUSED_STATE_SET;
   1160     /**
   1161      * Indicates the view is enabled and selected.
   1162      *
   1163      * @see #ENABLED_STATE_SET
   1164      * @see #SELECTED_STATE_SET
   1165      */
   1166     protected static final int[] ENABLED_SELECTED_STATE_SET;
   1167     /**
   1168      * Indicates the view is enabled and that its window has focus.
   1169      *
   1170      * @see #ENABLED_STATE_SET
   1171      * @see #WINDOW_FOCUSED_STATE_SET
   1172      */
   1173     protected static final int[] ENABLED_WINDOW_FOCUSED_STATE_SET;
   1174     /**
   1175      * Indicates the view is focused and selected.
   1176      *
   1177      * @see #FOCUSED_STATE_SET
   1178      * @see #SELECTED_STATE_SET
   1179      */
   1180     protected static final int[] FOCUSED_SELECTED_STATE_SET;
   1181     /**
   1182      * Indicates the view has the focus and that its window has the focus.
   1183      *
   1184      * @see #FOCUSED_STATE_SET
   1185      * @see #WINDOW_FOCUSED_STATE_SET
   1186      */
   1187     protected static final int[] FOCUSED_WINDOW_FOCUSED_STATE_SET;
   1188     /**
   1189      * Indicates the view is selected and that its window has the focus.
   1190      *
   1191      * @see #SELECTED_STATE_SET
   1192      * @see #WINDOW_FOCUSED_STATE_SET
   1193      */
   1194     protected static final int[] SELECTED_WINDOW_FOCUSED_STATE_SET;
   1195     // Triples
   1196     /**
   1197      * Indicates the view is enabled, focused and selected.
   1198      *
   1199      * @see #ENABLED_STATE_SET
   1200      * @see #FOCUSED_STATE_SET
   1201      * @see #SELECTED_STATE_SET
   1202      */
   1203     protected static final int[] ENABLED_FOCUSED_SELECTED_STATE_SET;
   1204     /**
   1205      * Indicates the view is enabled, focused and its window has the focus.
   1206      *
   1207      * @see #ENABLED_STATE_SET
   1208      * @see #FOCUSED_STATE_SET
   1209      * @see #WINDOW_FOCUSED_STATE_SET
   1210      */
   1211     protected static final int[] ENABLED_FOCUSED_WINDOW_FOCUSED_STATE_SET;
   1212     /**
   1213      * Indicates the view is enabled, selected and its window has the focus.
   1214      *
   1215      * @see #ENABLED_STATE_SET
   1216      * @see #SELECTED_STATE_SET
   1217      * @see #WINDOW_FOCUSED_STATE_SET
   1218      */
   1219     protected static final int[] ENABLED_SELECTED_WINDOW_FOCUSED_STATE_SET;
   1220     /**
   1221      * Indicates the view is focused, selected and its window has the focus.
   1222      *
   1223      * @see #FOCUSED_STATE_SET
   1224      * @see #SELECTED_STATE_SET
   1225      * @see #WINDOW_FOCUSED_STATE_SET
   1226      */
   1227     protected static final int[] FOCUSED_SELECTED_WINDOW_FOCUSED_STATE_SET;
   1228     /**
   1229      * Indicates the view is enabled, focused, selected and its window
   1230      * has the focus.
   1231      *
   1232      * @see #ENABLED_STATE_SET
   1233      * @see #FOCUSED_STATE_SET
   1234      * @see #SELECTED_STATE_SET
   1235      * @see #WINDOW_FOCUSED_STATE_SET
   1236      */
   1237     protected static final int[] ENABLED_FOCUSED_SELECTED_WINDOW_FOCUSED_STATE_SET;
   1238     /**
   1239      * Indicates the view is pressed and its window has the focus.
   1240      *
   1241      * @see #PRESSED_STATE_SET
   1242      * @see #WINDOW_FOCUSED_STATE_SET
   1243      */
   1244     protected static final int[] PRESSED_WINDOW_FOCUSED_STATE_SET;
   1245     /**
   1246      * Indicates the view is pressed and selected.
   1247      *
   1248      * @see #PRESSED_STATE_SET
   1249      * @see #SELECTED_STATE_SET
   1250      */
   1251     protected static final int[] PRESSED_SELECTED_STATE_SET;
   1252     /**
   1253      * Indicates the view is pressed, selected and its window has the focus.
   1254      *
   1255      * @see #PRESSED_STATE_SET
   1256      * @see #SELECTED_STATE_SET
   1257      * @see #WINDOW_FOCUSED_STATE_SET
   1258      */
   1259     protected static final int[] PRESSED_SELECTED_WINDOW_FOCUSED_STATE_SET;
   1260     /**
   1261      * Indicates the view is pressed and focused.
   1262      *
   1263      * @see #PRESSED_STATE_SET
   1264      * @see #FOCUSED_STATE_SET
   1265      */
   1266     protected static final int[] PRESSED_FOCUSED_STATE_SET;
   1267     /**
   1268      * Indicates the view is pressed, focused and its window has the focus.
   1269      *
   1270      * @see #PRESSED_STATE_SET
   1271      * @see #FOCUSED_STATE_SET
   1272      * @see #WINDOW_FOCUSED_STATE_SET
   1273      */
   1274     protected static final int[] PRESSED_FOCUSED_WINDOW_FOCUSED_STATE_SET;
   1275     /**
   1276      * Indicates the view is pressed, focused and selected.
   1277      *
   1278      * @see #PRESSED_STATE_SET
   1279      * @see #SELECTED_STATE_SET
   1280      * @see #FOCUSED_STATE_SET
   1281      */
   1282     protected static final int[] PRESSED_FOCUSED_SELECTED_STATE_SET;
   1283     /**
   1284      * Indicates the view is pressed, focused, selected and its window has the focus.
   1285      *
   1286      * @see #PRESSED_STATE_SET
   1287      * @see #FOCUSED_STATE_SET
   1288      * @see #SELECTED_STATE_SET
   1289      * @see #WINDOW_FOCUSED_STATE_SET
   1290      */
   1291     protected static final int[] PRESSED_FOCUSED_SELECTED_WINDOW_FOCUSED_STATE_SET;
   1292     /**
   1293      * Indicates the view is pressed and enabled.
   1294      *
   1295      * @see #PRESSED_STATE_SET
   1296      * @see #ENABLED_STATE_SET
   1297      */
   1298     protected static final int[] PRESSED_ENABLED_STATE_SET;
   1299     /**
   1300      * Indicates the view is pressed, enabled and its window has the focus.
   1301      *
   1302      * @see #PRESSED_STATE_SET
   1303      * @see #ENABLED_STATE_SET
   1304      * @see #WINDOW_FOCUSED_STATE_SET
   1305      */
   1306     protected static final int[] PRESSED_ENABLED_WINDOW_FOCUSED_STATE_SET;
   1307     /**
   1308      * Indicates the view is pressed, enabled and selected.
   1309      *
   1310      * @see #PRESSED_STATE_SET
   1311      * @see #ENABLED_STATE_SET
   1312      * @see #SELECTED_STATE_SET
   1313      */
   1314     protected static final int[] PRESSED_ENABLED_SELECTED_STATE_SET;
   1315     /**
   1316      * Indicates the view is pressed, enabled, selected and its window has the
   1317      * focus.
   1318      *
   1319      * @see #PRESSED_STATE_SET
   1320      * @see #ENABLED_STATE_SET
   1321      * @see #SELECTED_STATE_SET
   1322      * @see #WINDOW_FOCUSED_STATE_SET
   1323      */
   1324     protected static final int[] PRESSED_ENABLED_SELECTED_WINDOW_FOCUSED_STATE_SET;
   1325     /**
   1326      * Indicates the view is pressed, enabled and focused.
   1327      *
   1328      * @see #PRESSED_STATE_SET
   1329      * @see #ENABLED_STATE_SET
   1330      * @see #FOCUSED_STATE_SET
   1331      */
   1332     protected static final int[] PRESSED_ENABLED_FOCUSED_STATE_SET;
   1333     /**
   1334      * Indicates the view is pressed, enabled, focused and its window has the
   1335      * focus.
   1336      *
   1337      * @see #PRESSED_STATE_SET
   1338      * @see #ENABLED_STATE_SET
   1339      * @see #FOCUSED_STATE_SET
   1340      * @see #WINDOW_FOCUSED_STATE_SET
   1341      */
   1342     protected static final int[] PRESSED_ENABLED_FOCUSED_WINDOW_FOCUSED_STATE_SET;
   1343     /**
   1344      * Indicates the view is pressed, enabled, focused and selected.
   1345      *
   1346      * @see #PRESSED_STATE_SET
   1347      * @see #ENABLED_STATE_SET
   1348      * @see #SELECTED_STATE_SET
   1349      * @see #FOCUSED_STATE_SET
   1350      */
   1351     protected static final int[] PRESSED_ENABLED_FOCUSED_SELECTED_STATE_SET;
   1352     /**
   1353      * Indicates the view is pressed, enabled, focused, selected and its window
   1354      * has the focus.
   1355      *
   1356      * @see #PRESSED_STATE_SET
   1357      * @see #ENABLED_STATE_SET
   1358      * @see #SELECTED_STATE_SET
   1359      * @see #FOCUSED_STATE_SET
   1360      * @see #WINDOW_FOCUSED_STATE_SET
   1361      */
   1362     protected static final int[] PRESSED_ENABLED_FOCUSED_SELECTED_WINDOW_FOCUSED_STATE_SET;
   1363 
   1364     /**
   1365      * The order here is very important to {@link #getDrawableState()}
   1366      */
   1367     private static final int[][] VIEW_STATE_SETS;
   1368 
   1369     static final int VIEW_STATE_WINDOW_FOCUSED = 1;
   1370     static final int VIEW_STATE_SELECTED = 1 << 1;
   1371     static final int VIEW_STATE_FOCUSED = 1 << 2;
   1372     static final int VIEW_STATE_ENABLED = 1 << 3;
   1373     static final int VIEW_STATE_PRESSED = 1 << 4;
   1374     static final int VIEW_STATE_ACTIVATED = 1 << 5;
   1375     static final int VIEW_STATE_ACCELERATED = 1 << 6;
   1376     static final int VIEW_STATE_HOVERED = 1 << 7;
   1377     static final int VIEW_STATE_DRAG_CAN_ACCEPT = 1 << 8;
   1378     static final int VIEW_STATE_DRAG_HOVERED = 1 << 9;
   1379 
   1380     static final int[] VIEW_STATE_IDS = new int[] {
   1381         R.attr.state_window_focused,    VIEW_STATE_WINDOW_FOCUSED,
   1382         R.attr.state_selected,          VIEW_STATE_SELECTED,
   1383         R.attr.state_focused,           VIEW_STATE_FOCUSED,
   1384         R.attr.state_enabled,           VIEW_STATE_ENABLED,
   1385         R.attr.state_pressed,           VIEW_STATE_PRESSED,
   1386         R.attr.state_activated,         VIEW_STATE_ACTIVATED,
   1387         R.attr.state_accelerated,       VIEW_STATE_ACCELERATED,
   1388         R.attr.state_hovered,           VIEW_STATE_HOVERED,
   1389         R.attr.state_drag_can_accept,   VIEW_STATE_DRAG_CAN_ACCEPT,
   1390         R.attr.state_drag_hovered,      VIEW_STATE_DRAG_HOVERED
   1391     };
   1392 
   1393     static {
   1394         if ((VIEW_STATE_IDS.length/2) != R.styleable.ViewDrawableStates.length) {
   1395             throw new IllegalStateException(
   1396                     "VIEW_STATE_IDs array length does not match ViewDrawableStates style array");
   1397         }
   1398         int[] orderedIds = new int[VIEW_STATE_IDS.length];
   1399         for (int i = 0; i < R.styleable.ViewDrawableStates.length; i++) {
   1400             int viewState = R.styleable.ViewDrawableStates[i];
   1401             for (int j = 0; j<VIEW_STATE_IDS.length; j += 2) {
   1402                 if (VIEW_STATE_IDS[j] == viewState) {
   1403                     orderedIds[i * 2] = viewState;
   1404                     orderedIds[i * 2 + 1] = VIEW_STATE_IDS[j + 1];
   1405                 }
   1406             }
   1407         }
   1408         final int NUM_BITS = VIEW_STATE_IDS.length / 2;
   1409         VIEW_STATE_SETS = new int[1 << NUM_BITS][];
   1410         for (int i = 0; i < VIEW_STATE_SETS.length; i++) {
   1411             int numBits = Integer.bitCount(i);
   1412             int[] set = new int[numBits];
   1413             int pos = 0;
   1414             for (int j = 0; j < orderedIds.length; j += 2) {
   1415                 if ((i & orderedIds[j+1]) != 0) {
   1416                     set[pos++] = orderedIds[j];
   1417                 }
   1418             }
   1419             VIEW_STATE_SETS[i] = set;
   1420         }
   1421 
   1422         EMPTY_STATE_SET = VIEW_STATE_SETS[0];
   1423         WINDOW_FOCUSED_STATE_SET = VIEW_STATE_SETS[VIEW_STATE_WINDOW_FOCUSED];
   1424         SELECTED_STATE_SET = VIEW_STATE_SETS[VIEW_STATE_SELECTED];
   1425         SELECTED_WINDOW_FOCUSED_STATE_SET = VIEW_STATE_SETS[
   1426                 VIEW_STATE_WINDOW_FOCUSED | VIEW_STATE_SELECTED];
   1427         FOCUSED_STATE_SET = VIEW_STATE_SETS[VIEW_STATE_FOCUSED];
   1428         FOCUSED_WINDOW_FOCUSED_STATE_SET = VIEW_STATE_SETS[
   1429                 VIEW_STATE_WINDOW_FOCUSED | VIEW_STATE_FOCUSED];
   1430         FOCUSED_SELECTED_STATE_SET = VIEW_STATE_SETS[
   1431                 VIEW_STATE_SELECTED | VIEW_STATE_FOCUSED];
   1432         FOCUSED_SELECTED_WINDOW_FOCUSED_STATE_SET = VIEW_STATE_SETS[
   1433                 VIEW_STATE_WINDOW_FOCUSED | VIEW_STATE_SELECTED
   1434                 | VIEW_STATE_FOCUSED];
   1435         ENABLED_STATE_SET = VIEW_STATE_SETS[VIEW_STATE_ENABLED];
   1436         ENABLED_WINDOW_FOCUSED_STATE_SET = VIEW_STATE_SETS[
   1437                 VIEW_STATE_WINDOW_FOCUSED | VIEW_STATE_ENABLED];
   1438         ENABLED_SELECTED_STATE_SET = VIEW_STATE_SETS[
   1439                 VIEW_STATE_SELECTED | VIEW_STATE_ENABLED];
   1440         ENABLED_SELECTED_WINDOW_FOCUSED_STATE_SET = VIEW_STATE_SETS[
   1441                 VIEW_STATE_WINDOW_FOCUSED | VIEW_STATE_SELECTED
   1442                 | VIEW_STATE_ENABLED];
   1443         ENABLED_FOCUSED_STATE_SET = VIEW_STATE_SETS[
   1444                 VIEW_STATE_FOCUSED | VIEW_STATE_ENABLED];
   1445         ENABLED_FOCUSED_WINDOW_FOCUSED_STATE_SET = VIEW_STATE_SETS[
   1446                 VIEW_STATE_WINDOW_FOCUSED | VIEW_STATE_FOCUSED
   1447                 | VIEW_STATE_ENABLED];
   1448         ENABLED_FOCUSED_SELECTED_STATE_SET = VIEW_STATE_SETS[
   1449                 VIEW_STATE_SELECTED | VIEW_STATE_FOCUSED
   1450                 | VIEW_STATE_ENABLED];
   1451         ENABLED_FOCUSED_SELECTED_WINDOW_FOCUSED_STATE_SET = VIEW_STATE_SETS[
   1452                 VIEW_STATE_WINDOW_FOCUSED | VIEW_STATE_SELECTED
   1453                 | VIEW_STATE_FOCUSED| VIEW_STATE_ENABLED];
   1454 
   1455         PRESSED_STATE_SET = VIEW_STATE_SETS[VIEW_STATE_PRESSED];
   1456         PRESSED_WINDOW_FOCUSED_STATE_SET = VIEW_STATE_SETS[
   1457                 VIEW_STATE_WINDOW_FOCUSED | VIEW_STATE_PRESSED];
   1458         PRESSED_SELECTED_STATE_SET = VIEW_STATE_SETS[
   1459                 VIEW_STATE_SELECTED | VIEW_STATE_PRESSED];
   1460         PRESSED_SELECTED_WINDOW_FOCUSED_STATE_SET = VIEW_STATE_SETS[
   1461                 VIEW_STATE_WINDOW_FOCUSED | VIEW_STATE_SELECTED
   1462                 | VIEW_STATE_PRESSED];
   1463         PRESSED_FOCUSED_STATE_SET = VIEW_STATE_SETS[
   1464                 VIEW_STATE_FOCUSED | VIEW_STATE_PRESSED];
   1465         PRESSED_FOCUSED_WINDOW_FOCUSED_STATE_SET = VIEW_STATE_SETS[
   1466                 VIEW_STATE_WINDOW_FOCUSED | VIEW_STATE_FOCUSED
   1467                 | VIEW_STATE_PRESSED];
   1468         PRESSED_FOCUSED_SELECTED_STATE_SET = VIEW_STATE_SETS[
   1469                 VIEW_STATE_SELECTED | VIEW_STATE_FOCUSED
   1470                 | VIEW_STATE_PRESSED];
   1471         PRESSED_FOCUSED_SELECTED_WINDOW_FOCUSED_STATE_SET = VIEW_STATE_SETS[
   1472                 VIEW_STATE_WINDOW_FOCUSED | VIEW_STATE_SELECTED
   1473                 | VIEW_STATE_FOCUSED | VIEW_STATE_PRESSED];
   1474         PRESSED_ENABLED_STATE_SET = VIEW_STATE_SETS[
   1475                 VIEW_STATE_ENABLED | VIEW_STATE_PRESSED];
   1476         PRESSED_ENABLED_WINDOW_FOCUSED_STATE_SET = VIEW_STATE_SETS[
   1477                 VIEW_STATE_WINDOW_FOCUSED | VIEW_STATE_ENABLED
   1478                 | VIEW_STATE_PRESSED];
   1479         PRESSED_ENABLED_SELECTED_STATE_SET = VIEW_STATE_SETS[
   1480                 VIEW_STATE_SELECTED | VIEW_STATE_ENABLED
   1481                 | VIEW_STATE_PRESSED];
   1482         PRESSED_ENABLED_SELECTED_WINDOW_FOCUSED_STATE_SET = VIEW_STATE_SETS[
   1483                 VIEW_STATE_WINDOW_FOCUSED | VIEW_STATE_SELECTED
   1484                 | VIEW_STATE_ENABLED | VIEW_STATE_PRESSED];
   1485         PRESSED_ENABLED_FOCUSED_STATE_SET = VIEW_STATE_SETS[
   1486                 VIEW_STATE_FOCUSED | VIEW_STATE_ENABLED
   1487                 | VIEW_STATE_PRESSED];
   1488         PRESSED_ENABLED_FOCUSED_WINDOW_FOCUSED_STATE_SET = VIEW_STATE_SETS[
   1489                 VIEW_STATE_WINDOW_FOCUSED | VIEW_STATE_FOCUSED
   1490                 | VIEW_STATE_ENABLED | VIEW_STATE_PRESSED];
   1491         PRESSED_ENABLED_FOCUSED_SELECTED_STATE_SET = VIEW_STATE_SETS[
   1492                 VIEW_STATE_SELECTED | VIEW_STATE_FOCUSED
   1493                 | VIEW_STATE_ENABLED | VIEW_STATE_PRESSED];
   1494         PRESSED_ENABLED_FOCUSED_SELECTED_WINDOW_FOCUSED_STATE_SET = VIEW_STATE_SETS[
   1495                 VIEW_STATE_WINDOW_FOCUSED | VIEW_STATE_SELECTED
   1496                 | VIEW_STATE_FOCUSED| VIEW_STATE_ENABLED
   1497                 | VIEW_STATE_PRESSED];
   1498     }
   1499 
   1500     /**
   1501      * Accessibility event types that are dispatched for text population.
   1502      */
   1503     private static final int POPULATING_ACCESSIBILITY_EVENT_TYPES =
   1504             AccessibilityEvent.TYPE_VIEW_CLICKED
   1505             | AccessibilityEvent.TYPE_VIEW_LONG_CLICKED
   1506             | AccessibilityEvent.TYPE_VIEW_SELECTED
   1507             | AccessibilityEvent.TYPE_VIEW_FOCUSED
   1508             | AccessibilityEvent.TYPE_WINDOW_STATE_CHANGED
   1509             | AccessibilityEvent.TYPE_VIEW_HOVER_ENTER
   1510             | AccessibilityEvent.TYPE_VIEW_HOVER_EXIT
   1511             | AccessibilityEvent.TYPE_VIEW_TEXT_CHANGED
   1512             | AccessibilityEvent.TYPE_VIEW_TEXT_SELECTION_CHANGED
   1513             | AccessibilityEvent.TYPE_VIEW_ACCESSIBILITY_FOCUSED
   1514             | AccessibilityEvent.TYPE_VIEW_TEXT_TRAVERSED_AT_MOVEMENT_GRANULARITY;
   1515 
   1516     /**
   1517      * Temporary Rect currently for use in setBackground().  This will probably
   1518      * be extended in the future to hold our own class with more than just
   1519      * a Rect. :)
   1520      */
   1521     static final ThreadLocal<Rect> sThreadLocal = new ThreadLocal<Rect>();
   1522 
   1523     /**
   1524      * Map used to store views' tags.
   1525      */
   1526     private SparseArray<Object> mKeyedTags;
   1527 
   1528     /**
   1529      * The next available accessibility id.
   1530      */
   1531     private static int sNextAccessibilityViewId;
   1532 
   1533     /**
   1534      * The animation currently associated with this view.
   1535      * @hide
   1536      */
   1537     protected Animation mCurrentAnimation = null;
   1538 
   1539     /**
   1540      * Width as measured during measure pass.
   1541      * {@hide}
   1542      */
   1543     @ViewDebug.ExportedProperty(category = "measurement")
   1544     int mMeasuredWidth;
   1545 
   1546     /**
   1547      * Height as measured during measure pass.
   1548      * {@hide}
   1549      */
   1550     @ViewDebug.ExportedProperty(category = "measurement")
   1551     int mMeasuredHeight;
   1552 
   1553     /**
   1554      * Flag to indicate that this view was marked INVALIDATED, or had its display list
   1555      * invalidated, prior to the current drawing iteration. If true, the view must re-draw
   1556      * its display list. This flag, used only when hw accelerated, allows us to clear the
   1557      * flag while retaining this information until it's needed (at getDisplayList() time and
   1558      * in drawChild(), when we decide to draw a view's children's display lists into our own).
   1559      *
   1560      * {@hide}
   1561      */
   1562     boolean mRecreateDisplayList = false;
   1563 
   1564     /**
   1565      * The view's identifier.
   1566      * {@hide}
   1567      *
   1568      * @see #setId(int)
   1569      * @see #getId()
   1570      */
   1571     @ViewDebug.ExportedProperty(resolveId = true)
   1572     int mID = NO_ID;
   1573 
   1574     /**
   1575      * The stable ID of this view for accessibility purposes.
   1576      */
   1577     int mAccessibilityViewId = NO_ID;
   1578 
   1579     private int mAccessibilityCursorPosition = ACCESSIBILITY_CURSOR_POSITION_UNDEFINED;
   1580 
   1581     SendViewStateChangedAccessibilityEvent mSendViewStateChangedAccessibilityEvent;
   1582 
   1583     /**
   1584      * The view's tag.
   1585      * {@hide}
   1586      *
   1587      * @see #setTag(Object)
   1588      * @see #getTag()
   1589      */
   1590     protected Object mTag;
   1591 
   1592     // for mPrivateFlags:
   1593     /** {@hide} */
   1594     static final int PFLAG_WANTS_FOCUS                 = 0x00000001;
   1595     /** {@hide} */
   1596     static final int PFLAG_FOCUSED                     = 0x00000002;
   1597     /** {@hide} */
   1598     static final int PFLAG_SELECTED                    = 0x00000004;
   1599     /** {@hide} */
   1600     static final int PFLAG_IS_ROOT_NAMESPACE           = 0x00000008;
   1601     /** {@hide} */
   1602     static final int PFLAG_HAS_BOUNDS                  = 0x00000010;
   1603     /** {@hide} */
   1604     static final int PFLAG_DRAWN                       = 0x00000020;
   1605     /**
   1606      * When this flag is set, this view is running an animation on behalf of its
   1607      * children and should therefore not cancel invalidate requests, even if they
   1608      * lie outside of this view's bounds.
   1609      *
   1610      * {@hide}
   1611      */
   1612     static final int PFLAG_DRAW_ANIMATION              = 0x00000040;
   1613     /** {@hide} */
   1614     static final int PFLAG_SKIP_DRAW                   = 0x00000080;
   1615     /** {@hide} */
   1616     static final int PFLAG_ONLY_DRAWS_BACKGROUND       = 0x00000100;
   1617     /** {@hide} */
   1618     static final int PFLAG_REQUEST_TRANSPARENT_REGIONS = 0x00000200;
   1619     /** {@hide} */
   1620     static final int PFLAG_DRAWABLE_STATE_DIRTY        = 0x00000400;
   1621     /** {@hide} */
   1622     static final int PFLAG_MEASURED_DIMENSION_SET      = 0x00000800;
   1623     /** {@hide} */
   1624     static final int PFLAG_FORCE_LAYOUT                = 0x00001000;
   1625     /** {@hide} */
   1626     static final int PFLAG_LAYOUT_REQUIRED             = 0x00002000;
   1627 
   1628     private static final int PFLAG_PRESSED             = 0x00004000;
   1629 
   1630     /** {@hide} */
   1631     static final int PFLAG_DRAWING_CACHE_VALID         = 0x00008000;
   1632     /**
   1633      * Flag used to indicate that this view should be drawn once more (and only once
   1634      * more) after its animation has completed.
   1635      * {@hide}
   1636      */
   1637     static final int PFLAG_ANIMATION_STARTED           = 0x00010000;
   1638 
   1639     private static final int PFLAG_SAVE_STATE_CALLED   = 0x00020000;
   1640 
   1641     /**
   1642      * Indicates that the View returned true when onSetAlpha() was called and that
   1643      * the alpha must be restored.
   1644      * {@hide}
   1645      */
   1646     static final int PFLAG_ALPHA_SET                   = 0x00040000;
   1647 
   1648     /**
   1649      * Set by {@link #setScrollContainer(boolean)}.
   1650      */
   1651     static final int PFLAG_SCROLL_CONTAINER            = 0x00080000;
   1652 
   1653     /**
   1654      * Set by {@link #setScrollContainer(boolean)}.
   1655      */
   1656     static final int PFLAG_SCROLL_CONTAINER_ADDED      = 0x00100000;
   1657 
   1658     /**
   1659      * View flag indicating whether this view was invalidated (fully or partially.)
   1660      *
   1661      * @hide
   1662      */
   1663     static final int PFLAG_DIRTY                       = 0x00200000;
   1664 
   1665     /**
   1666      * View flag indicating whether this view was invalidated by an opaque
   1667      * invalidate request.
   1668      *
   1669      * @hide
   1670      */
   1671     static final int PFLAG_DIRTY_OPAQUE                = 0x00400000;
   1672 
   1673     /**
   1674      * Mask for {@link #PFLAG_DIRTY} and {@link #PFLAG_DIRTY_OPAQUE}.
   1675      *
   1676      * @hide
   1677      */
   1678     static final int PFLAG_DIRTY_MASK                  = 0x00600000;
   1679 
   1680     /**
   1681      * Indicates whether the background is opaque.
   1682      *
   1683      * @hide
   1684      */
   1685     static final int PFLAG_OPAQUE_BACKGROUND           = 0x00800000;
   1686 
   1687     /**
   1688      * Indicates whether the scrollbars are opaque.
   1689      *
   1690      * @hide
   1691      */
   1692     static final int PFLAG_OPAQUE_SCROLLBARS           = 0x01000000;
   1693 
   1694     /**
   1695      * Indicates whether the view is opaque.
   1696      *
   1697      * @hide
   1698      */
   1699     static final int PFLAG_OPAQUE_MASK                 = 0x01800000;
   1700 
   1701     /**
   1702      * Indicates a prepressed state;
   1703      * the short time between ACTION_DOWN and recognizing
   1704      * a 'real' press. Prepressed is used to recognize quick taps
   1705      * even when they are shorter than ViewConfiguration.getTapTimeout().
   1706      *
   1707      * @hide
   1708      */
   1709     private static final int PFLAG_PREPRESSED          = 0x02000000;
   1710 
   1711     /**
   1712      * Indicates whether the view is temporarily detached.
   1713      *
   1714      * @hide
   1715      */
   1716     static final int PFLAG_CANCEL_NEXT_UP_EVENT        = 0x04000000;
   1717 
   1718     /**
   1719      * Indicates that we should awaken scroll bars once attached
   1720      *
   1721      * @hide
   1722      */
   1723     private static final int PFLAG_AWAKEN_SCROLL_BARS_ON_ATTACH = 0x08000000;
   1724 
   1725     /**
   1726      * Indicates that the view has received HOVER_ENTER.  Cleared on HOVER_EXIT.
   1727      * @hide
   1728      */
   1729     private static final int PFLAG_HOVERED             = 0x10000000;
   1730 
   1731     /**
   1732      * Indicates that pivotX or pivotY were explicitly set and we should not assume the center
   1733      * for transform operations
   1734      *
   1735      * @hide
   1736      */
   1737     private static final int PFLAG_PIVOT_EXPLICITLY_SET = 0x20000000;
   1738 
   1739     /** {@hide} */
   1740     static final int PFLAG_ACTIVATED                   = 0x40000000;
   1741 
   1742     /**
   1743      * Indicates that this view was specifically invalidated, not just dirtied because some
   1744      * child view was invalidated. The flag is used to determine when we need to recreate
   1745      * a view's display list (as opposed to just returning a reference to its existing
   1746      * display list).
   1747      *
   1748      * @hide
   1749      */
   1750     static final int PFLAG_INVALIDATED                 = 0x80000000;
   1751 
   1752     /**
   1753      * Masks for mPrivateFlags2, as generated by dumpFlags():
   1754      *
   1755      * |-------|-------|-------|-------|
   1756      *                                 1 PFLAG2_DRAG_CAN_ACCEPT
   1757      *                                1  PFLAG2_DRAG_HOVERED
   1758      *                              11   PFLAG2_LAYOUT_DIRECTION_MASK
   1759      *                             1     PFLAG2_LAYOUT_DIRECTION_RESOLVED_RTL
   1760      *                            1      PFLAG2_LAYOUT_DIRECTION_RESOLVED
   1761      *                            11     PFLAG2_LAYOUT_DIRECTION_RESOLVED_MASK
   1762      *                           1       PFLAG2_TEXT_DIRECTION_FLAGS[1]
   1763      *                          1        PFLAG2_TEXT_DIRECTION_FLAGS[2]
   1764      *                          11       PFLAG2_TEXT_DIRECTION_FLAGS[3]
   1765      *                         1         PFLAG2_TEXT_DIRECTION_FLAGS[4]
   1766      *                         1 1       PFLAG2_TEXT_DIRECTION_FLAGS[5]
   1767      *                         111       PFLAG2_TEXT_DIRECTION_MASK
   1768      *                        1          PFLAG2_TEXT_DIRECTION_RESOLVED
   1769      *                       1           PFLAG2_TEXT_DIRECTION_RESOLVED_DEFAULT
   1770      *                     111           PFLAG2_TEXT_DIRECTION_RESOLVED_MASK
   1771      *                    1              PFLAG2_TEXT_ALIGNMENT_FLAGS[1]
   1772      *                   1               PFLAG2_TEXT_ALIGNMENT_FLAGS[2]
   1773      *                   11              PFLAG2_TEXT_ALIGNMENT_FLAGS[3]
   1774      *                  1                PFLAG2_TEXT_ALIGNMENT_FLAGS[4]
   1775      *                  1 1              PFLAG2_TEXT_ALIGNMENT_FLAGS[5]
   1776      *                  11               PFLAG2_TEXT_ALIGNMENT_FLAGS[6]
   1777      *                  111              PFLAG2_TEXT_ALIGNMENT_MASK
   1778      *                 1                 PFLAG2_TEXT_ALIGNMENT_RESOLVED
   1779      *                1                  PFLAG2_TEXT_ALIGNMENT_RESOLVED_DEFAULT
   1780      *              111                  PFLAG2_TEXT_ALIGNMENT_RESOLVED_MASK
   1781      *           111                     PFLAG2_IMPORTANT_FOR_ACCESSIBILITY_MASK
   1782      *         11                        PFLAG2_ACCESSIBILITY_LIVE_REGION_MASK
   1783      *       1                           PFLAG2_ACCESSIBILITY_FOCUSED
   1784      *      1                            PFLAG2_SUBTREE_ACCESSIBILITY_STATE_CHANGED
   1785      *     1                             PFLAG2_VIEW_QUICK_REJECTED
   1786      *    1                              PFLAG2_PADDING_RESOLVED
   1787      *   1                               PFLAG2_DRAWABLE_RESOLVED
   1788      *  1                                PFLAG2_HAS_TRANSIENT_STATE
   1789      * |-------|-------|-------|-------|
   1790      */
   1791 
   1792     /**
   1793      * Indicates that this view has reported that it can accept the current drag's content.
   1794      * Cleared when the drag operation concludes.
   1795      * @hide
   1796      */
   1797     static final int PFLAG2_DRAG_CAN_ACCEPT            = 0x00000001;
   1798 
   1799     /**
   1800      * Indicates that this view is currently directly under the drag location in a
   1801      * drag-and-drop operation involving content that it can accept.  Cleared when
   1802      * the drag exits the view, or when the drag operation concludes.
   1803      * @hide
   1804      */
   1805     static final int PFLAG2_DRAG_HOVERED               = 0x00000002;
   1806 
   1807     /**
   1808      * Horizontal layout direction of this view is from Left to Right.
   1809      * Use with {@link #setLayoutDirection}.
   1810      */
   1811     public static final int LAYOUT_DIRECTION_LTR = LayoutDirection.LTR;
   1812 
   1813     /**
   1814      * Horizontal layout direction of this view is from Right to Left.
   1815      * Use with {@link #setLayoutDirection}.
   1816      */
   1817     public static final int LAYOUT_DIRECTION_RTL = LayoutDirection.RTL;
   1818 
   1819     /**
   1820      * Horizontal layout direction of this view is inherited from its parent.
   1821      * Use with {@link #setLayoutDirection}.
   1822      */
   1823     public static final int LAYOUT_DIRECTION_INHERIT = LayoutDirection.INHERIT;
   1824 
   1825     /**
   1826      * Horizontal layout direction of this view is from deduced from the default language
   1827      * script for the locale. Use with {@link #setLayoutDirection}.
   1828      */
   1829     public static final int LAYOUT_DIRECTION_LOCALE = LayoutDirection.LOCALE;
   1830 
   1831     /**
   1832      * Bit shift to get the horizontal layout direction. (bits after DRAG_HOVERED)
   1833      * @hide
   1834      */
   1835     static final int PFLAG2_LAYOUT_DIRECTION_MASK_SHIFT = 2;
   1836 
   1837     /**
   1838      * Mask for use with private flags indicating bits used for horizontal layout direction.
   1839      * @hide
   1840      */
   1841     static final int PFLAG2_LAYOUT_DIRECTION_MASK = 0x00000003 << PFLAG2_LAYOUT_DIRECTION_MASK_SHIFT;
   1842 
   1843     /**
   1844      * Indicates whether the view horizontal layout direction has been resolved and drawn to the
   1845      * right-to-left direction.
   1846      * @hide
   1847      */
   1848     static final int PFLAG2_LAYOUT_DIRECTION_RESOLVED_RTL = 4 << PFLAG2_LAYOUT_DIRECTION_MASK_SHIFT;
   1849 
   1850     /**
   1851      * Indicates whether the view horizontal layout direction has been resolved.
   1852      * @hide
   1853      */
   1854     static final int PFLAG2_LAYOUT_DIRECTION_RESOLVED = 8 << PFLAG2_LAYOUT_DIRECTION_MASK_SHIFT;
   1855 
   1856     /**
   1857      * Mask for use with private flags indicating bits used for resolved horizontal layout direction.
   1858      * @hide
   1859      */
   1860     static final int PFLAG2_LAYOUT_DIRECTION_RESOLVED_MASK = 0x0000000C
   1861             << PFLAG2_LAYOUT_DIRECTION_MASK_SHIFT;
   1862 
   1863     /*
   1864      * Array of horizontal layout direction flags for mapping attribute "layoutDirection" to correct
   1865      * flag value.
   1866      * @hide
   1867      */
   1868     private static final int[] LAYOUT_DIRECTION_FLAGS = {
   1869             LAYOUT_DIRECTION_LTR,
   1870             LAYOUT_DIRECTION_RTL,
   1871             LAYOUT_DIRECTION_INHERIT,
   1872             LAYOUT_DIRECTION_LOCALE
   1873     };
   1874 
   1875     /**
   1876      * Default horizontal layout direction.
   1877      */
   1878     private static final int LAYOUT_DIRECTION_DEFAULT = LAYOUT_DIRECTION_INHERIT;
   1879 
   1880     /**
   1881      * Default horizontal layout direction.
   1882      * @hide
   1883      */
   1884     static final int LAYOUT_DIRECTION_RESOLVED_DEFAULT = LAYOUT_DIRECTION_LTR;
   1885 
   1886     /**
   1887      * Text direction is inherited thru {@link ViewGroup}
   1888      */
   1889     public static final int TEXT_DIRECTION_INHERIT = 0;
   1890 
   1891     /**
   1892      * Text direction is using "first strong algorithm". The first strong directional character
   1893      * determines the paragraph direction. If there is no strong directional character, the
   1894      * paragraph direction is the view's resolved layout direction.
   1895      */
   1896     public static final int TEXT_DIRECTION_FIRST_STRONG = 1;
   1897 
   1898     /**
   1899      * Text direction is using "any-RTL" algorithm. The paragraph direction is RTL if it contains
   1900      * any strong RTL character, otherwise it is LTR if it contains any strong LTR characters.
   1901      * If there are neither, the paragraph direction is the view's resolved layout direction.
   1902      */
   1903     public static final int TEXT_DIRECTION_ANY_RTL = 2;
   1904 
   1905     /**
   1906      * Text direction is forced to LTR.
   1907      */
   1908     public static final int TEXT_DIRECTION_LTR = 3;
   1909 
   1910     /**
   1911      * Text direction is forced to RTL.
   1912      */
   1913     public static final int TEXT_DIRECTION_RTL = 4;
   1914 
   1915     /**
   1916      * Text direction is coming from the system Locale.
   1917      */
   1918     public static final int TEXT_DIRECTION_LOCALE = 5;
   1919 
   1920     /**
   1921      * Default text direction is inherited
   1922      */
   1923     private static final int TEXT_DIRECTION_DEFAULT = TEXT_DIRECTION_INHERIT;
   1924 
   1925     /**
   1926      * Default resolved text direction
   1927      * @hide
   1928      */
   1929     static final int TEXT_DIRECTION_RESOLVED_DEFAULT = TEXT_DIRECTION_FIRST_STRONG;
   1930 
   1931     /**
   1932      * Bit shift to get the horizontal layout direction. (bits after LAYOUT_DIRECTION_RESOLVED)
   1933      * @hide
   1934      */
   1935     static final int PFLAG2_TEXT_DIRECTION_MASK_SHIFT = 6;
   1936 
   1937     /**
   1938      * Mask for use with private flags indicating bits used for text direction.
   1939      * @hide
   1940      */
   1941     static final int PFLAG2_TEXT_DIRECTION_MASK = 0x00000007
   1942             << PFLAG2_TEXT_DIRECTION_MASK_SHIFT;
   1943 
   1944     /**
   1945      * Array of text direction flags for mapping attribute "textDirection" to correct
   1946      * flag value.
   1947      * @hide
   1948      */
   1949     private static final int[] PFLAG2_TEXT_DIRECTION_FLAGS = {
   1950             TEXT_DIRECTION_INHERIT << PFLAG2_TEXT_DIRECTION_MASK_SHIFT,
   1951             TEXT_DIRECTION_FIRST_STRONG << PFLAG2_TEXT_DIRECTION_MASK_SHIFT,
   1952             TEXT_DIRECTION_ANY_RTL << PFLAG2_TEXT_DIRECTION_MASK_SHIFT,
   1953             TEXT_DIRECTION_LTR << PFLAG2_TEXT_DIRECTION_MASK_SHIFT,
   1954             TEXT_DIRECTION_RTL << PFLAG2_TEXT_DIRECTION_MASK_SHIFT,
   1955             TEXT_DIRECTION_LOCALE << PFLAG2_TEXT_DIRECTION_MASK_SHIFT
   1956     };
   1957 
   1958     /**
   1959      * Indicates whether the view text direction has been resolved.
   1960      * @hide
   1961      */
   1962     static final int PFLAG2_TEXT_DIRECTION_RESOLVED = 0x00000008
   1963             << PFLAG2_TEXT_DIRECTION_MASK_SHIFT;
   1964 
   1965     /**
   1966      * Bit shift to get the horizontal layout direction. (bits after DRAG_HOVERED)
   1967      * @hide
   1968      */
   1969     static final int PFLAG2_TEXT_DIRECTION_RESOLVED_MASK_SHIFT = 10;
   1970 
   1971     /**
   1972      * Mask for use with private flags indicating bits used for resolved text direction.
   1973      * @hide
   1974      */
   1975     static final int PFLAG2_TEXT_DIRECTION_RESOLVED_MASK = 0x00000007
   1976             << PFLAG2_TEXT_DIRECTION_RESOLVED_MASK_SHIFT;
   1977 
   1978     /**
   1979      * Indicates whether the view text direction has been resolved to the "first strong" heuristic.
   1980      * @hide
   1981      */
   1982     static final int PFLAG2_TEXT_DIRECTION_RESOLVED_DEFAULT =
   1983             TEXT_DIRECTION_RESOLVED_DEFAULT << PFLAG2_TEXT_DIRECTION_RESOLVED_MASK_SHIFT;
   1984 
   1985     /*
   1986      * Default text alignment. The text alignment of this View is inherited from its parent.
   1987      * Use with {@link #setTextAlignment(int)}
   1988      */
   1989     public static final int TEXT_ALIGNMENT_INHERIT = 0;
   1990 
   1991     /**
   1992      * Default for the root view. The gravity determines the text alignment, ALIGN_NORMAL,
   1993      * ALIGN_CENTER, or ALIGN_OPPOSITE, which are relative to each paragraphs text direction.
   1994      *
   1995      * Use with {@link #setTextAlignment(int)}
   1996      */
   1997     public static final int TEXT_ALIGNMENT_GRAVITY = 1;
   1998 
   1999     /**
   2000      * Align to the start of the paragraph, e.g. ALIGN_NORMAL.
   2001      *
   2002      * Use with {@link #setTextAlignment(int)}
   2003      */
   2004     public static final int TEXT_ALIGNMENT_TEXT_START = 2;
   2005 
   2006     /**
   2007      * Align to the end of the paragraph, e.g. ALIGN_OPPOSITE.
   2008      *
   2009      * Use with {@link #setTextAlignment(int)}
   2010      */
   2011     public static final int TEXT_ALIGNMENT_TEXT_END = 3;
   2012 
   2013     /**
   2014      * Center the paragraph, e.g. ALIGN_CENTER.
   2015      *
   2016      * Use with {@link #setTextAlignment(int)}
   2017      */
   2018     public static final int TEXT_ALIGNMENT_CENTER = 4;
   2019 
   2020     /**
   2021      * Align to the start of the view, which is ALIGN_LEFT if the views resolved
   2022      * layoutDirection is LTR, and ALIGN_RIGHT otherwise.
   2023      *
   2024      * Use with {@link #setTextAlignment(int)}
   2025      */
   2026     public static final int TEXT_ALIGNMENT_VIEW_START = 5;
   2027 
   2028     /**
   2029      * Align to the end of the view, which is ALIGN_RIGHT if the views resolved
   2030      * layoutDirection is LTR, and ALIGN_LEFT otherwise.
   2031      *
   2032      * Use with {@link #setTextAlignment(int)}
   2033      */
   2034     public static final int TEXT_ALIGNMENT_VIEW_END = 6;
   2035 
   2036     /**
   2037      * Default text alignment is inherited
   2038      */
   2039     private static final int TEXT_ALIGNMENT_DEFAULT = TEXT_ALIGNMENT_GRAVITY;
   2040 
   2041     /**
   2042      * Default resolved text alignment
   2043      * @hide
   2044      */
   2045     static final int TEXT_ALIGNMENT_RESOLVED_DEFAULT = TEXT_ALIGNMENT_GRAVITY;
   2046 
   2047     /**
   2048       * Bit shift to get the horizontal layout direction. (bits after DRAG_HOVERED)
   2049       * @hide
   2050       */
   2051     static final int PFLAG2_TEXT_ALIGNMENT_MASK_SHIFT = 13;
   2052 
   2053     /**
   2054       * Mask for use with private flags indicating bits used for text alignment.
   2055       * @hide
   2056       */
   2057     static final int PFLAG2_TEXT_ALIGNMENT_MASK = 0x00000007 << PFLAG2_TEXT_ALIGNMENT_MASK_SHIFT;
   2058 
   2059     /**
   2060      * Array of text direction flags for mapping attribute "textAlignment" to correct
   2061      * flag value.
   2062      * @hide
   2063      */
   2064     private static final int[] PFLAG2_TEXT_ALIGNMENT_FLAGS = {
   2065             TEXT_ALIGNMENT_INHERIT << PFLAG2_TEXT_ALIGNMENT_MASK_SHIFT,
   2066             TEXT_ALIGNMENT_GRAVITY << PFLAG2_TEXT_ALIGNMENT_MASK_SHIFT,
   2067             TEXT_ALIGNMENT_TEXT_START << PFLAG2_TEXT_ALIGNMENT_MASK_SHIFT,
   2068             TEXT_ALIGNMENT_TEXT_END << PFLAG2_TEXT_ALIGNMENT_MASK_SHIFT,
   2069             TEXT_ALIGNMENT_CENTER << PFLAG2_TEXT_ALIGNMENT_MASK_SHIFT,
   2070             TEXT_ALIGNMENT_VIEW_START << PFLAG2_TEXT_ALIGNMENT_MASK_SHIFT,
   2071             TEXT_ALIGNMENT_VIEW_END << PFLAG2_TEXT_ALIGNMENT_MASK_SHIFT
   2072     };
   2073 
   2074     /**
   2075      * Indicates whether the view text alignment has been resolved.
   2076      * @hide
   2077      */
   2078     static final int PFLAG2_TEXT_ALIGNMENT_RESOLVED = 0x00000008 << PFLAG2_TEXT_ALIGNMENT_MASK_SHIFT;
   2079 
   2080     /**
   2081      * Bit shift to get the resolved text alignment.
   2082      * @hide
   2083      */
   2084     static final int PFLAG2_TEXT_ALIGNMENT_RESOLVED_MASK_SHIFT = 17;
   2085 
   2086     /**
   2087      * Mask for use with private flags indicating bits used for text alignment.
   2088      * @hide
   2089      */
   2090     static final int PFLAG2_TEXT_ALIGNMENT_RESOLVED_MASK = 0x00000007
   2091             << PFLAG2_TEXT_ALIGNMENT_RESOLVED_MASK_SHIFT;
   2092 
   2093     /**
   2094      * Indicates whether if the view text alignment has been resolved to gravity
   2095      */
   2096     private static final int PFLAG2_TEXT_ALIGNMENT_RESOLVED_DEFAULT =
   2097             TEXT_ALIGNMENT_RESOLVED_DEFAULT << PFLAG2_TEXT_ALIGNMENT_RESOLVED_MASK_SHIFT;
   2098 
   2099     // Accessiblity constants for mPrivateFlags2
   2100 
   2101     /**
   2102      * Shift for the bits in {@link #mPrivateFlags2} related to the
   2103      * "importantForAccessibility" attribute.
   2104      */
   2105     static final int PFLAG2_IMPORTANT_FOR_ACCESSIBILITY_SHIFT = 20;
   2106 
   2107     /**
   2108      * Automatically determine whether a view is important for accessibility.
   2109      */
   2110     public static final int IMPORTANT_FOR_ACCESSIBILITY_AUTO = 0x00000000;
   2111 
   2112     /**
   2113      * The view is important for accessibility.
   2114      */
   2115     public static final int IMPORTANT_FOR_ACCESSIBILITY_YES = 0x00000001;
   2116 
   2117     /**
   2118      * The view is not important for accessibility.
   2119      */
   2120     public static final int IMPORTANT_FOR_ACCESSIBILITY_NO = 0x00000002;
   2121 
   2122     /**
   2123      * The view is not important for accessibility, nor are any of its
   2124      * descendant views.
   2125      */
   2126     public static final int IMPORTANT_FOR_ACCESSIBILITY_NO_HIDE_DESCENDANTS = 0x00000004;
   2127 
   2128     /**
   2129      * The default whether the view is important for accessibility.
   2130      */
   2131     static final int IMPORTANT_FOR_ACCESSIBILITY_DEFAULT = IMPORTANT_FOR_ACCESSIBILITY_AUTO;
   2132 
   2133     /**
   2134      * Mask for obtainig the bits which specify how to determine
   2135      * whether a view is important for accessibility.
   2136      */
   2137     static final int PFLAG2_IMPORTANT_FOR_ACCESSIBILITY_MASK = (IMPORTANT_FOR_ACCESSIBILITY_AUTO
   2138         | IMPORTANT_FOR_ACCESSIBILITY_YES | IMPORTANT_FOR_ACCESSIBILITY_NO
   2139         | IMPORTANT_FOR_ACCESSIBILITY_NO_HIDE_DESCENDANTS)
   2140         << PFLAG2_IMPORTANT_FOR_ACCESSIBILITY_SHIFT;
   2141 
   2142     /**
   2143      * Shift for the bits in {@link #mPrivateFlags2} related to the
   2144      * "accessibilityLiveRegion" attribute.
   2145      */
   2146     static final int PFLAG2_ACCESSIBILITY_LIVE_REGION_SHIFT = 23;
   2147 
   2148     /**
   2149      * Live region mode specifying that accessibility services should not
   2150      * automatically announce changes to this view. This is the default live
   2151      * region mode for most views.
   2152      * <p>
   2153      * Use with {@link #setAccessibilityLiveRegion(int)}.
   2154      */
   2155     public static final int ACCESSIBILITY_LIVE_REGION_NONE = 0x00000000;
   2156 
   2157     /**
   2158      * Live region mode specifying that accessibility services should announce
   2159      * changes to this view.
   2160      * <p>
   2161      * Use with {@link #setAccessibilityLiveRegion(int)}.
   2162      */
   2163     public static final int ACCESSIBILITY_LIVE_REGION_POLITE = 0x00000001;
   2164 
   2165     /**
   2166      * Live region mode specifying that accessibility services should interrupt
   2167      * ongoing speech to immediately announce changes to this view.
   2168      * <p>
   2169      * Use with {@link #setAccessibilityLiveRegion(int)}.
   2170      */
   2171     public static final int ACCESSIBILITY_LIVE_REGION_ASSERTIVE = 0x00000002;
   2172 
   2173     /**
   2174      * The default whether the view is important for accessibility.
   2175      */
   2176     static final int ACCESSIBILITY_LIVE_REGION_DEFAULT = ACCESSIBILITY_LIVE_REGION_NONE;
   2177 
   2178     /**
   2179      * Mask for obtaining the bits which specify a view's accessibility live
   2180      * region mode.
   2181      */
   2182     static final int PFLAG2_ACCESSIBILITY_LIVE_REGION_MASK = (ACCESSIBILITY_LIVE_REGION_NONE
   2183             | ACCESSIBILITY_LIVE_REGION_POLITE | ACCESSIBILITY_LIVE_REGION_ASSERTIVE)
   2184             << PFLAG2_ACCESSIBILITY_LIVE_REGION_SHIFT;
   2185 
   2186     /**
   2187      * Flag indicating whether a view has accessibility focus.
   2188      */
   2189     static final int PFLAG2_ACCESSIBILITY_FOCUSED = 0x04000000;
   2190 
   2191     /**
   2192      * Flag whether the accessibility state of the subtree rooted at this view changed.
   2193      */
   2194     static final int PFLAG2_SUBTREE_ACCESSIBILITY_STATE_CHANGED = 0x08000000;
   2195 
   2196     /**
   2197      * Flag indicating whether a view failed the quickReject() check in draw(). This condition
   2198      * is used to check whether later changes to the view's transform should invalidate the
   2199      * view to force the quickReject test to run again.
   2200      */
   2201     static final int PFLAG2_VIEW_QUICK_REJECTED = 0x10000000;
   2202 
   2203     /**
   2204      * Flag indicating that start/end padding has been resolved into left/right padding
   2205      * for use in measurement, layout, drawing, etc. This is set by {@link #resolvePadding()}
   2206      * and checked by {@link #measure(int, int)} to determine if padding needs to be resolved
   2207      * during measurement. In some special cases this is required such as when an adapter-based
   2208      * view measures prospective children without attaching them to a window.
   2209      */
   2210     static final int PFLAG2_PADDING_RESOLVED = 0x20000000;
   2211 
   2212     /**
   2213      * Flag indicating that the start/end drawables has been resolved into left/right ones.
   2214      */
   2215     static final int PFLAG2_DRAWABLE_RESOLVED = 0x40000000;
   2216 
   2217     /**
   2218      * Indicates that the view is tracking some sort of transient state
   2219      * that the app should not need to be aware of, but that the framework
   2220      * should take special care to preserve.
   2221      */
   2222     static final int PFLAG2_HAS_TRANSIENT_STATE = 0x80000000;
   2223 
   2224     /**
   2225      * Group of bits indicating that RTL properties resolution is done.
   2226      */
   2227     static final int ALL_RTL_PROPERTIES_RESOLVED = PFLAG2_LAYOUT_DIRECTION_RESOLVED |
   2228             PFLAG2_TEXT_DIRECTION_RESOLVED |
   2229             PFLAG2_TEXT_ALIGNMENT_RESOLVED |
   2230             PFLAG2_PADDING_RESOLVED |
   2231             PFLAG2_DRAWABLE_RESOLVED;
   2232 
   2233     // There are a couple of flags left in mPrivateFlags2
   2234 
   2235     /* End of masks for mPrivateFlags2 */
   2236 
   2237     /* Masks for mPrivateFlags3 */
   2238 
   2239     /**
   2240      * Flag indicating that view has a transform animation set on it. This is used to track whether
   2241      * an animation is cleared between successive frames, in order to tell the associated
   2242      * DisplayList to clear its animation matrix.
   2243      */
   2244     static final int PFLAG3_VIEW_IS_ANIMATING_TRANSFORM = 0x1;
   2245 
   2246     /**
   2247      * Flag indicating that view has an alpha animation set on it. This is used to track whether an
   2248      * animation is cleared between successive frames, in order to tell the associated
   2249      * DisplayList to restore its alpha value.
   2250      */
   2251     static final int PFLAG3_VIEW_IS_ANIMATING_ALPHA = 0x2;
   2252 
   2253     /**
   2254      * Flag indicating that the view has been through at least one layout since it
   2255      * was last attached to a window.
   2256      */
   2257     static final int PFLAG3_IS_LAID_OUT = 0x4;
   2258 
   2259     /**
   2260      * Flag indicating that a call to measure() was skipped and should be done
   2261      * instead when layout() is invoked.
   2262      */
   2263     static final int PFLAG3_MEASURE_NEEDED_BEFORE_LAYOUT = 0x8;
   2264 
   2265     /**
   2266      * Flag indicating that an overridden method correctly  called down to
   2267      * the superclass implementation as required by the API spec.
   2268      */
   2269     static final int PFLAG3_CALLED_SUPER = 0x10;
   2270 
   2271 
   2272     /* End of masks for mPrivateFlags3 */
   2273 
   2274     static final int DRAG_MASK = PFLAG2_DRAG_CAN_ACCEPT | PFLAG2_DRAG_HOVERED;
   2275 
   2276     /**
   2277      * Always allow a user to over-scroll this view, provided it is a
   2278      * view that can scroll.
   2279      *
   2280      * @see #getOverScrollMode()
   2281      * @see #setOverScrollMode(int)
   2282      */
   2283     public static final int OVER_SCROLL_ALWAYS = 0;
   2284 
   2285     /**
   2286      * Allow a user to over-scroll this view only if the content is large
   2287      * enough to meaningfully scroll, provided it is a view that can scroll.
   2288      *
   2289      * @see #getOverScrollMode()
   2290      * @see #setOverScrollMode(int)
   2291      */
   2292     public static final int OVER_SCROLL_IF_CONTENT_SCROLLS = 1;
   2293 
   2294     /**
   2295      * Never allow a user to over-scroll this view.
   2296      *
   2297      * @see #getOverScrollMode()
   2298      * @see #setOverScrollMode(int)
   2299      */
   2300     public static final int OVER_SCROLL_NEVER = 2;
   2301 
   2302     /**
   2303      * Special constant for {@link #setSystemUiVisibility(int)}: View has
   2304      * requested the system UI (status bar) to be visible (the default).
   2305      *
   2306      * @see #setSystemUiVisibility(int)
   2307      */
   2308     public static final int SYSTEM_UI_FLAG_VISIBLE = 0;
   2309 
   2310     /**
   2311      * Flag for {@link #setSystemUiVisibility(int)}: View has requested the
   2312      * system UI to enter an unobtrusive "low profile" mode.
   2313      *
   2314      * <p>This is for use in games, book readers, video players, or any other
   2315      * "immersive" application where the usual system chrome is deemed too distracting.
   2316      *
   2317      * <p>In low profile mode, the status bar and/or navigation icons may dim.
   2318      *
   2319      * @see #setSystemUiVisibility(int)
   2320      */
   2321     public static final int SYSTEM_UI_FLAG_LOW_PROFILE = 0x00000001;
   2322 
   2323     /**
   2324      * Flag for {@link #setSystemUiVisibility(int)}: View has requested that the
   2325      * system navigation be temporarily hidden.
   2326      *
   2327      * <p>This is an even less obtrusive state than that called for by
   2328      * {@link #SYSTEM_UI_FLAG_LOW_PROFILE}; on devices that draw essential navigation controls
   2329      * (Home, Back, and the like) on screen, <code>SYSTEM_UI_FLAG_HIDE_NAVIGATION</code> will cause
   2330      * those to disappear. This is useful (in conjunction with the
   2331      * {@link android.view.WindowManager.LayoutParams#FLAG_FULLSCREEN FLAG_FULLSCREEN} and
   2332      * {@link android.view.WindowManager.LayoutParams#FLAG_LAYOUT_IN_SCREEN FLAG_LAYOUT_IN_SCREEN}
   2333      * window flags) for displaying content using every last pixel on the display.
   2334      *
   2335      * <p>There is a limitation: because navigation controls are so important, the least user
   2336      * interaction will cause them to reappear immediately.  When this happens, both
   2337      * this flag and {@link #SYSTEM_UI_FLAG_FULLSCREEN} will be cleared automatically,
   2338      * so that both elements reappear at the same time.
   2339      *
   2340      * @see #setSystemUiVisibility(int)
   2341      */
   2342     public static final int SYSTEM_UI_FLAG_HIDE_NAVIGATION = 0x00000002;
   2343 
   2344     /**
   2345      * Flag for {@link #setSystemUiVisibility(int)}: View has requested to go
   2346      * into the normal fullscreen mode so that its content can take over the screen
   2347      * while still allowing the user to interact with the application.
   2348      *
   2349      * <p>This has the same visual effect as
   2350      * {@link android.view.WindowManager.LayoutParams#FLAG_FULLSCREEN
   2351      * WindowManager.LayoutParams.FLAG_FULLSCREEN},
   2352      * meaning that non-critical screen decorations (such as the status bar) will be
   2353      * hidden while the user is in the View's window, focusing the experience on
   2354      * that content.  Unlike the window flag, if you are using ActionBar in
   2355      * overlay mode with {@link Window#FEATURE_ACTION_BAR_OVERLAY
   2356      * Window.FEATURE_ACTION_BAR_OVERLAY}, then enabling this flag will also
   2357      * hide the action bar.
   2358      *
   2359      * <p>This approach to going fullscreen is best used over the window flag when
   2360      * it is a transient state -- that is, the application does this at certain
   2361      * points in its user interaction where it wants to allow the user to focus
   2362      * on content, but not as a continuous state.  For situations where the application
   2363      * would like to simply stay full screen the entire time (such as a game that
   2364      * wants to take over the screen), the
   2365      * {@link android.view.WindowManager.LayoutParams#FLAG_FULLSCREEN window flag}
   2366      * is usually a better approach.  The state set here will be removed by the system
   2367      * in various situations (such as the user moving to another application) like
   2368      * the other system UI states.
   2369      *
   2370      * <p>When using this flag, the application should provide some easy facility
   2371      * for the user to go out of it.  A common example would be in an e-book
   2372      * reader, where tapping on the screen brings back whatever screen and UI
   2373      * decorations that had been hidden while the user was immersed in reading
   2374      * the book.
   2375      *
   2376      * @see #setSystemUiVisibility(int)
   2377      */
   2378     public static final int SYSTEM_UI_FLAG_FULLSCREEN = 0x00000004;
   2379 
   2380     /**
   2381      * Flag for {@link #setSystemUiVisibility(int)}: When using other layout
   2382      * flags, we would like a stable view of the content insets given to
   2383      * {@link #fitSystemWindows(Rect)}.  This means that the insets seen there
   2384      * will always represent the worst case that the application can expect
   2385      * as a continuous state.  In the stock Android UI this is the space for
   2386      * the system bar, nav bar, and status bar, but not more transient elements
   2387      * such as an input method.
   2388      *
   2389      * The stable layout your UI sees is based on the system UI modes you can
   2390      * switch to.  That is, if you specify {@link #SYSTEM_UI_FLAG_LAYOUT_FULLSCREEN}
   2391      * then you will get a stable layout for changes of the
   2392      * {@link #SYSTEM_UI_FLAG_FULLSCREEN} mode; if you specify
   2393      * {@link #SYSTEM_UI_FLAG_LAYOUT_FULLSCREEN} and
   2394      * {@link #SYSTEM_UI_FLAG_LAYOUT_HIDE_NAVIGATION}, then you can transition
   2395      * to {@link #SYSTEM_UI_FLAG_FULLSCREEN} and {@link #SYSTEM_UI_FLAG_HIDE_NAVIGATION}
   2396      * with a stable layout.  (Note that you should avoid using
   2397      * {@link #SYSTEM_UI_FLAG_LAYOUT_HIDE_NAVIGATION} by itself.)
   2398      *
   2399      * If you have set the window flag {@link WindowManager.LayoutParams#FLAG_FULLSCREEN}
   2400      * to hide the status bar (instead of using {@link #SYSTEM_UI_FLAG_FULLSCREEN}),
   2401      * then a hidden status bar will be considered a "stable" state for purposes
   2402      * here.  This allows your UI to continually hide the status bar, while still
   2403      * using the system UI flags to hide the action bar while still retaining
   2404      * a stable layout.  Note that changing the window fullscreen flag will never
   2405      * provide a stable layout for a clean transition.
   2406      *
   2407      * <p>If you are using ActionBar in
   2408      * overlay mode with {@link Window#FEATURE_ACTION_BAR_OVERLAY
   2409      * Window.FEATURE_ACTION_BAR_OVERLAY}, this flag will also impact the
   2410      * insets it adds to those given to the application.
   2411      */
   2412     public static final int SYSTEM_UI_FLAG_LAYOUT_STABLE = 0x00000100;
   2413 
   2414     /**
   2415      * Flag for {@link #setSystemUiVisibility(int)}: View would like its window
   2416      * to be layed out as if it has requested
   2417      * {@link #SYSTEM_UI_FLAG_HIDE_NAVIGATION}, even if it currently hasn't.  This
   2418      * allows it to avoid artifacts when switching in and out of that mode, at
   2419      * the expense that some of its user interface may be covered by screen
   2420      * decorations when they are shown.  You can perform layout of your inner
   2421      * UI elements to account for the navigation system UI through the
   2422      * {@link #fitSystemWindows(Rect)} method.
   2423      */
   2424     public static final int SYSTEM_UI_FLAG_LAYOUT_HIDE_NAVIGATION = 0x00000200;
   2425 
   2426     /**
   2427      * Flag for {@link #setSystemUiVisibility(int)}: View would like its window
   2428      * to be layed out as if it has requested
   2429      * {@link #SYSTEM_UI_FLAG_FULLSCREEN}, even if it currently hasn't.  This
   2430      * allows it to avoid artifacts when switching in and out of that mode, at
   2431      * the expense that some of its user interface may be covered by screen
   2432      * decorations when they are shown.  You can perform layout of your inner
   2433      * UI elements to account for non-fullscreen system UI through the
   2434      * {@link #fitSystemWindows(Rect)} method.
   2435      */
   2436     public static final int SYSTEM_UI_FLAG_LAYOUT_FULLSCREEN = 0x00000400;
   2437 
   2438     /**
   2439      * Flag for {@link #setSystemUiVisibility(int)}: View would like to remain interactive when
   2440      * hiding the navigation bar with {@link #SYSTEM_UI_FLAG_HIDE_NAVIGATION}.  If this flag is
   2441      * not set, {@link #SYSTEM_UI_FLAG_HIDE_NAVIGATION} will be force cleared by the system on any
   2442      * user interaction.
   2443      * <p>Since this flag is a modifier for {@link #SYSTEM_UI_FLAG_HIDE_NAVIGATION}, it only
   2444      * has an effect when used in combination with that flag.</p>
   2445      */
   2446     public static final int SYSTEM_UI_FLAG_IMMERSIVE = 0x00000800;
   2447 
   2448     /**
   2449      * Flag for {@link #setSystemUiVisibility(int)}: View would like to remain interactive when
   2450      * hiding the status bar with {@link #SYSTEM_UI_FLAG_FULLSCREEN} and/or hiding the navigation
   2451      * bar with {@link #SYSTEM_UI_FLAG_HIDE_NAVIGATION}.  Use this flag to create an immersive
   2452      * experience while also hiding the system bars.  If this flag is not set,
   2453      * {@link #SYSTEM_UI_FLAG_HIDE_NAVIGATION} will be force cleared by the system on any user
   2454      * interaction, and {@link #SYSTEM_UI_FLAG_FULLSCREEN} will be force-cleared by the system
   2455      * if the user swipes from the top of the screen.
   2456      * <p>When system bars are hidden in immersive mode, they can be revealed temporarily with
   2457      * system gestures, such as swiping from the top of the screen.  These transient system bars
   2458      * will overlay apps content, may have some degree of transparency, and will automatically
   2459      * hide after a short timeout.
   2460      * </p><p>Since this flag is a modifier for {@link #SYSTEM_UI_FLAG_FULLSCREEN} and
   2461      * {@link #SYSTEM_UI_FLAG_HIDE_NAVIGATION}, it only has an effect when used in combination
   2462      * with one or both of those flags.</p>
   2463      */
   2464     public static final int SYSTEM_UI_FLAG_IMMERSIVE_STICKY = 0x00001000;
   2465 
   2466     /**
   2467      * @deprecated Use {@link #SYSTEM_UI_FLAG_LOW_PROFILE} instead.
   2468      */
   2469     public static final int STATUS_BAR_HIDDEN = SYSTEM_UI_FLAG_LOW_PROFILE;
   2470 
   2471     /**
   2472      * @deprecated Use {@link #SYSTEM_UI_FLAG_VISIBLE} instead.
   2473      */
   2474     public static final int STATUS_BAR_VISIBLE = SYSTEM_UI_FLAG_VISIBLE;
   2475 
   2476     /**
   2477      * @hide
   2478      *
   2479      * NOTE: This flag may only be used in subtreeSystemUiVisibility. It is masked
   2480      * out of the public fields to keep the undefined bits out of the developer's way.
   2481      *
   2482      * Flag to make the status bar not expandable.  Unless you also
   2483      * set {@link #STATUS_BAR_DISABLE_NOTIFICATION_ICONS}, new notifications will continue to show.
   2484      */
   2485     public static final int STATUS_BAR_DISABLE_EXPAND = 0x00010000;
   2486 
   2487     /**
   2488      * @hide
   2489      *
   2490      * NOTE: This flag may only be used in subtreeSystemUiVisibility. It is masked
   2491      * out of the public fields to keep the undefined bits out of the developer's way.
   2492      *
   2493      * Flag to hide notification icons and scrolling ticker text.
   2494      */
   2495     public static final int STATUS_BAR_DISABLE_NOTIFICATION_ICONS = 0x00020000;
   2496 
   2497     /**
   2498      * @hide
   2499      *
   2500      * NOTE: This flag may only be used in subtreeSystemUiVisibility. It is masked
   2501      * out of the public fields to keep the undefined bits out of the developer's way.
   2502      *
   2503      * Flag to disable incoming notification alerts.  This will not block
   2504      * icons, but it will block sound, vibrating and other visual or aural notifications.
   2505      */
   2506     public static final int STATUS_BAR_DISABLE_NOTIFICATION_ALERTS = 0x00040000;
   2507 
   2508     /**
   2509      * @hide
   2510      *
   2511      * NOTE: This flag may only be used in subtreeSystemUiVisibility. It is masked
   2512      * out of the public fields to keep the undefined bits out of the developer's way.
   2513      *
   2514      * Flag to hide only the scrolling ticker.  Note that
   2515      * {@link #STATUS_BAR_DISABLE_NOTIFICATION_ICONS} implies
   2516      * {@link #STATUS_BAR_DISABLE_NOTIFICATION_TICKER}.
   2517      */
   2518     public static final int STATUS_BAR_DISABLE_NOTIFICATION_TICKER = 0x00080000;
   2519 
   2520     /**
   2521      * @hide
   2522      *
   2523      * NOTE: This flag may only be used in subtreeSystemUiVisibility. It is masked
   2524      * out of the public fields to keep the undefined bits out of the developer's way.
   2525      *
   2526      * Flag to hide the center system info area.
   2527      */
   2528     public static final int STATUS_BAR_DISABLE_SYSTEM_INFO = 0x00100000;
   2529 
   2530     /**
   2531      * @hide
   2532      *
   2533      * NOTE: This flag may only be used in subtreeSystemUiVisibility. It is masked
   2534      * out of the public fields to keep the undefined bits out of the developer's way.
   2535      *
   2536      * Flag to hide only the home button.  Don't use this
   2537      * unless you're a special part of the system UI (i.e., setup wizard, keyguard).
   2538      */
   2539     public static final int STATUS_BAR_DISABLE_HOME = 0x00200000;
   2540 
   2541     /**
   2542      * @hide
   2543      *
   2544      * NOTE: This flag may only be used in subtreeSystemUiVisibility. It is masked
   2545      * out of the public fields to keep the undefined bits out of the developer's way.
   2546      *
   2547      * Flag to hide only the back button. Don't use this
   2548      * unless you're a special part of the system UI (i.e., setup wizard, keyguard).
   2549      */
   2550     public static final int STATUS_BAR_DISABLE_BACK = 0x00400000;
   2551 
   2552     /**
   2553      * @hide
   2554      *
   2555      * NOTE: This flag may only be used in subtreeSystemUiVisibility. It is masked
   2556      * out of the public fields to keep the undefined bits out of the developer's way.
   2557      *
   2558      * Flag to hide only the clock.  You might use this if your activity has
   2559      * its own clock making the status bar's clock redundant.
   2560      */
   2561     public static final int STATUS_BAR_DISABLE_CLOCK = 0x00800000;
   2562 
   2563     /**
   2564      * @hide
   2565      *
   2566      * NOTE: This flag may only be used in subtreeSystemUiVisibility. It is masked
   2567      * out of the public fields to keep the undefined bits out of the developer's way.
   2568      *
   2569      * Flag to hide only the recent apps button. Don't use this
   2570      * unless you're a special part of the system UI (i.e., setup wizard, keyguard).
   2571      */
   2572     public static final int STATUS_BAR_DISABLE_RECENT = 0x01000000;
   2573 
   2574     /**
   2575      * @hide
   2576      *
   2577      * NOTE: This flag may only be used in subtreeSystemUiVisibility. It is masked
   2578      * out of the public fields to keep the undefined bits out of the developer's way.
   2579      *
   2580      * Flag to disable the global search gesture. Don't use this
   2581      * unless you're a special part of the system UI (i.e., setup wizard, keyguard).
   2582      */
   2583     public static final int STATUS_BAR_DISABLE_SEARCH = 0x02000000;
   2584 
   2585     /**
   2586      * @hide
   2587      *
   2588      * NOTE: This flag may only be used in subtreeSystemUiVisibility. It is masked
   2589      * out of the public fields to keep the undefined bits out of the developer's way.
   2590      *
   2591      * Flag to specify that the status bar is displayed in transient mode.
   2592      */
   2593     public static final int STATUS_BAR_TRANSIENT = 0x04000000;
   2594 
   2595     /**
   2596      * @hide
   2597      *
   2598      * NOTE: This flag may only be used in subtreeSystemUiVisibility. It is masked
   2599      * out of the public fields to keep the undefined bits out of the developer's way.
   2600      *
   2601      * Flag to specify that the navigation bar is displayed in transient mode.
   2602      */
   2603     public static final int NAVIGATION_BAR_TRANSIENT = 0x08000000;
   2604 
   2605     /**
   2606      * @hide
   2607      *
   2608      * NOTE: This flag may only be used in subtreeSystemUiVisibility. It is masked
   2609      * out of the public fields to keep the undefined bits out of the developer's way.
   2610      *
   2611      * Flag to specify that the hidden status bar would like to be shown.
   2612      */
   2613     public static final int STATUS_BAR_UNHIDE = 0x10000000;
   2614 
   2615     /**
   2616      * @hide
   2617      *
   2618      * NOTE: This flag may only be used in subtreeSystemUiVisibility. It is masked
   2619      * out of the public fields to keep the undefined bits out of the developer's way.
   2620      *
   2621      * Flag to specify that the hidden navigation bar would like to be shown.
   2622      */
   2623     public static final int NAVIGATION_BAR_UNHIDE = 0x20000000;
   2624 
   2625     /**
   2626      * @hide
   2627      *
   2628      * NOTE: This flag may only be used in subtreeSystemUiVisibility. It is masked
   2629      * out of the public fields to keep the undefined bits out of the developer's way.
   2630      *
   2631      * Flag to specify that the status bar is displayed in translucent mode.
   2632      */
   2633     public static final int STATUS_BAR_TRANSLUCENT = 0x40000000;
   2634 
   2635     /**
   2636      * @hide
   2637      *
   2638      * NOTE: This flag may only be used in subtreeSystemUiVisibility. It is masked
   2639      * out of the public fields to keep the undefined bits out of the developer's way.
   2640      *
   2641      * Flag to specify that the navigation bar is displayed in translucent mode.
   2642      */
   2643     public static final int NAVIGATION_BAR_TRANSLUCENT = 0x80000000;
   2644 
   2645     /**
   2646      * @hide
   2647      */
   2648     public static final int PUBLIC_STATUS_BAR_VISIBILITY_MASK = 0x0000FFFF;
   2649 
   2650     /**
   2651      * These are the system UI flags that can be cleared by events outside
   2652      * of an application.  Currently this is just the ability to tap on the
   2653      * screen while hiding the navigation bar to have it return.
   2654      * @hide
   2655      */
   2656     public static final int SYSTEM_UI_CLEARABLE_FLAGS =
   2657             SYSTEM_UI_FLAG_LOW_PROFILE | SYSTEM_UI_FLAG_HIDE_NAVIGATION
   2658             | SYSTEM_UI_FLAG_FULLSCREEN;
   2659 
   2660     /**
   2661      * Flags that can impact the layout in relation to system UI.
   2662      */
   2663     public static final int SYSTEM_UI_LAYOUT_FLAGS =
   2664             SYSTEM_UI_FLAG_LAYOUT_HIDE_NAVIGATION
   2665             | SYSTEM_UI_FLAG_LAYOUT_FULLSCREEN;
   2666 
   2667     /**
   2668      * Find views that render the specified text.
   2669      *
   2670      * @see #findViewsWithText(ArrayList, CharSequence, int)
   2671      */
   2672     public static final int FIND_VIEWS_WITH_TEXT = 0x00000001;
   2673 
   2674     /**
   2675      * Find find views that contain the specified content description.
   2676      *
   2677      * @see #findViewsWithText(ArrayList, CharSequence, int)
   2678      */
   2679     public static final int FIND_VIEWS_WITH_CONTENT_DESCRIPTION = 0x00000002;
   2680 
   2681     /**
   2682      * Find views that contain {@link AccessibilityNodeProvider}. Such
   2683      * a View is a root of virtual view hierarchy and may contain the searched
   2684      * text. If this flag is set Views with providers are automatically
   2685      * added and it is a responsibility of the client to call the APIs of
   2686      * the provider to determine whether the virtual tree rooted at this View
   2687      * contains the text, i.e. getting the list of {@link AccessibilityNodeInfo}s
   2688      * represeting the virtual views with this text.
   2689      *
   2690      * @see #findViewsWithText(ArrayList, CharSequence, int)
   2691      *
   2692      * @hide
   2693      */
   2694     public static final int FIND_VIEWS_WITH_ACCESSIBILITY_NODE_PROVIDERS = 0x00000004;
   2695 
   2696     /**
   2697      * The undefined cursor position.
   2698      *
   2699      * @hide
   2700      */
   2701     public static final int ACCESSIBILITY_CURSOR_POSITION_UNDEFINED = -1;
   2702 
   2703     /**
   2704      * Indicates that the screen has changed state and is now off.
   2705      *
   2706      * @see #onScreenStateChanged(int)
   2707      */
   2708     public static final int SCREEN_STATE_OFF = 0x0;
   2709 
   2710     /**
   2711      * Indicates that the screen has changed state and is now on.
   2712      *
   2713      * @see #onScreenStateChanged(int)
   2714      */
   2715     public static final int SCREEN_STATE_ON = 0x1;
   2716 
   2717     /**
   2718      * Controls the over-scroll mode for this view.
   2719      * See {@link #overScrollBy(int, int, int, int, int, int, int, int, boolean)},
   2720      * {@link #OVER_SCROLL_ALWAYS}, {@link #OVER_SCROLL_IF_CONTENT_SCROLLS},
   2721      * and {@link #OVER_SCROLL_NEVER}.
   2722      */
   2723     private int mOverScrollMode;
   2724 
   2725     /**
   2726      * The parent this view is attached to.
   2727      * {@hide}
   2728      *
   2729      * @see #getParent()
   2730      */
   2731     protected ViewParent mParent;
   2732 
   2733     /**
   2734      * {@hide}
   2735      */
   2736     AttachInfo mAttachInfo;
   2737 
   2738     /**
   2739      * {@hide}
   2740      */
   2741     @ViewDebug.ExportedProperty(flagMapping = {
   2742         @ViewDebug.FlagToString(mask = PFLAG_FORCE_LAYOUT, equals = PFLAG_FORCE_LAYOUT,
   2743                 name = "FORCE_LAYOUT"),
   2744         @ViewDebug.FlagToString(mask = PFLAG_LAYOUT_REQUIRED, equals = PFLAG_LAYOUT_REQUIRED,
   2745                 name = "LAYOUT_REQUIRED"),
   2746         @ViewDebug.FlagToString(mask = PFLAG_DRAWING_CACHE_VALID, equals = PFLAG_DRAWING_CACHE_VALID,
   2747             name = "DRAWING_CACHE_INVALID", outputIf = false),
   2748         @ViewDebug.FlagToString(mask = PFLAG_DRAWN, equals = PFLAG_DRAWN, name = "DRAWN", outputIf = true),
   2749         @ViewDebug.FlagToString(mask = PFLAG_DRAWN, equals = PFLAG_DRAWN, name = "NOT_DRAWN", outputIf = false),
   2750         @ViewDebug.FlagToString(mask = PFLAG_DIRTY_MASK, equals = PFLAG_DIRTY_OPAQUE, name = "DIRTY_OPAQUE"),
   2751         @ViewDebug.FlagToString(mask = PFLAG_DIRTY_MASK, equals = PFLAG_DIRTY, name = "DIRTY")
   2752     })
   2753     int mPrivateFlags;
   2754     int mPrivateFlags2;
   2755     int mPrivateFlags3;
   2756 
   2757     /**
   2758      * This view's request for the visibility of the status bar.
   2759      * @hide
   2760      */
   2761     @ViewDebug.ExportedProperty(flagMapping = {
   2762         @ViewDebug.FlagToString(mask = SYSTEM_UI_FLAG_LOW_PROFILE,
   2763                                 equals = SYSTEM_UI_FLAG_LOW_PROFILE,
   2764                                 name = "SYSTEM_UI_FLAG_LOW_PROFILE", outputIf = true),
   2765         @ViewDebug.FlagToString(mask = SYSTEM_UI_FLAG_HIDE_NAVIGATION,
   2766                                 equals = SYSTEM_UI_FLAG_HIDE_NAVIGATION,
   2767                                 name = "SYSTEM_UI_FLAG_HIDE_NAVIGATION", outputIf = true),
   2768         @ViewDebug.FlagToString(mask = PUBLIC_STATUS_BAR_VISIBILITY_MASK,
   2769                                 equals = SYSTEM_UI_FLAG_VISIBLE,
   2770                                 name = "SYSTEM_UI_FLAG_VISIBLE", outputIf = true)
   2771     })
   2772     int mSystemUiVisibility;
   2773 
   2774     /**
   2775      * Reference count for transient state.
   2776      * @see #setHasTransientState(boolean)
   2777      */
   2778     int mTransientStateCount = 0;
   2779 
   2780     /**
   2781      * Count of how many windows this view has been attached to.
   2782      */
   2783     int mWindowAttachCount;
   2784 
   2785     /**
   2786      * The layout parameters associated with this view and used by the parent
   2787      * {@link android.view.ViewGroup} to determine how this view should be
   2788      * laid out.
   2789      * {@hide}
   2790      */
   2791     protected ViewGroup.LayoutParams mLayoutParams;
   2792 
   2793     /**
   2794      * The view flags hold various views states.
   2795      * {@hide}
   2796      */
   2797     @ViewDebug.ExportedProperty
   2798     int mViewFlags;
   2799 
   2800     static class TransformationInfo {
   2801         /**
   2802          * The transform matrix for the View. This transform is calculated internally
   2803          * based on the rotation, scaleX, and scaleY properties. The identity matrix
   2804          * is used by default. Do *not* use this variable directly; instead call
   2805          * getMatrix(), which will automatically recalculate the matrix if necessary
   2806          * to get the correct matrix based on the latest rotation and scale properties.
   2807          */
   2808         private final Matrix mMatrix = new Matrix();
   2809 
   2810         /**
   2811          * The transform matrix for the View. This transform is calculated internally
   2812          * based on the rotation, scaleX, and scaleY properties. The identity matrix
   2813          * is used by default. Do *not* use this variable directly; instead call
   2814          * getInverseMatrix(), which will automatically recalculate the matrix if necessary
   2815          * to get the correct matrix based on the latest rotation and scale properties.
   2816          */
   2817         private Matrix mInverseMatrix;
   2818 
   2819         /**
   2820          * An internal variable that tracks whether we need to recalculate the
   2821          * transform matrix, based on whether the rotation or scaleX/Y properties
   2822          * have changed since the matrix was last calculated.
   2823          */
   2824         boolean mMatrixDirty = false;
   2825 
   2826         /**
   2827          * An internal variable that tracks whether we need to recalculate the
   2828          * transform matrix, based on whether the rotation or scaleX/Y properties
   2829          * have changed since the matrix was last calculated.
   2830          */
   2831         private boolean mInverseMatrixDirty = true;
   2832 
   2833         /**
   2834          * A variable that tracks whether we need to recalculate the
   2835          * transform matrix, based on whether the rotation or scaleX/Y properties
   2836          * have changed since the matrix was last calculated. This variable
   2837          * is only valid after a call to updateMatrix() or to a function that
   2838          * calls it such as getMatrix(), hasIdentityMatrix() and getInverseMatrix().
   2839          */
   2840         private boolean mMatrixIsIdentity = true;
   2841 
   2842         /**
   2843          * The Camera object is used to compute a 3D matrix when rotationX or rotationY are set.
   2844          */
   2845         private Camera mCamera = null;
   2846 
   2847         /**
   2848          * This matrix is used when computing the matrix for 3D rotations.
   2849          */
   2850         private Matrix matrix3D = null;
   2851 
   2852         /**
   2853          * These prev values are used to recalculate a centered pivot point when necessary. The
   2854          * pivot point is only used in matrix operations (when rotation, scale, or translation are
   2855          * set), so thes values are only used then as well.
   2856          */
   2857         private int mPrevWidth = -1;
   2858         private int mPrevHeight = -1;
   2859 
   2860         /**
   2861          * The degrees rotation around the vertical axis through the pivot point.
   2862          */
   2863         @ViewDebug.ExportedProperty
   2864         float mRotationY = 0f;
   2865 
   2866         /**
   2867          * The degrees rotation around the horizontal axis through the pivot point.
   2868          */
   2869         @ViewDebug.ExportedProperty
   2870         float mRotationX = 0f;
   2871 
   2872         /**
   2873          * The degrees rotation around the pivot point.
   2874          */
   2875         @ViewDebug.ExportedProperty
   2876         float mRotation = 0f;
   2877 
   2878         /**
   2879          * The amount of translation of the object away from its left property (post-layout).
   2880          */
   2881         @ViewDebug.ExportedProperty
   2882         float mTranslationX = 0f;
   2883 
   2884         /**
   2885          * The amount of translation of the object away from its top property (post-layout).
   2886          */
   2887         @ViewDebug.ExportedProperty
   2888         float mTranslationY = 0f;
   2889 
   2890         /**
   2891          * The amount of scale in the x direction around the pivot point. A
   2892          * value of 1 means no scaling is applied.
   2893          */
   2894         @ViewDebug.ExportedProperty
   2895         float mScaleX = 1f;
   2896 
   2897         /**
   2898          * The amount of scale in the y direction around the pivot point. A
   2899          * value of 1 means no scaling is applied.
   2900          */
   2901         @ViewDebug.ExportedProperty
   2902         float mScaleY = 1f;
   2903 
   2904         /**
   2905          * The x location of the point around which the view is rotated and scaled.
   2906          */
   2907         @ViewDebug.ExportedProperty
   2908         float mPivotX = 0f;
   2909 
   2910         /**
   2911          * The y location of the point around which the view is rotated and scaled.
   2912          */
   2913         @ViewDebug.ExportedProperty
   2914         float mPivotY = 0f;
   2915 
   2916         /**
   2917          * The opacity of the View. This is a value from 0 to 1, where 0 means
   2918          * completely transparent and 1 means completely opaque.
   2919          */
   2920         @ViewDebug.ExportedProperty
   2921         float mAlpha = 1f;
   2922 
   2923         /**
   2924          * The opacity of the view as manipulated by the Fade transition. This is a hidden
   2925          * property only used by transitions, which is composited with the other alpha
   2926          * values to calculate the final visual alpha value.
   2927          */
   2928         float mTransitionAlpha = 1f;
   2929     }
   2930 
   2931     TransformationInfo mTransformationInfo;
   2932 
   2933     /**
   2934      * Current clip bounds. to which all drawing of this view are constrained.
   2935      */
   2936     private Rect mClipBounds = null;
   2937 
   2938     private boolean mLastIsOpaque;
   2939 
   2940     /**
   2941      * Convenience value to check for float values that are close enough to zero to be considered
   2942      * zero.
   2943      */
   2944     private static final float NONZERO_EPSILON = .001f;
   2945 
   2946     /**
   2947      * The distance in pixels from the left edge of this view's parent
   2948      * to the left edge of this view.
   2949      * {@hide}
   2950      */
   2951     @ViewDebug.ExportedProperty(category = "layout")
   2952     protected int mLeft;
   2953     /**
   2954      * The distance in pixels from the left edge of this view's parent
   2955      * to the right edge of this view.
   2956      * {@hide}
   2957      */
   2958     @ViewDebug.ExportedProperty(category = "layout")
   2959     protected int mRight;
   2960     /**
   2961      * The distance in pixels from the top edge of this view's parent
   2962      * to the top edge of this view.
   2963      * {@hide}
   2964      */
   2965     @ViewDebug.ExportedProperty(category = "layout")
   2966     protected int mTop;
   2967     /**
   2968      * The distance in pixels from the top edge of this view's parent
   2969      * to the bottom edge of this view.
   2970      * {@hide}
   2971      */
   2972     @ViewDebug.ExportedProperty(category = "layout")
   2973     protected int mBottom;
   2974 
   2975     /**
   2976      * The offset, in pixels, by which the content of this view is scrolled
   2977      * horizontally.
   2978      * {@hide}
   2979      */
   2980     @ViewDebug.ExportedProperty(category = "scrolling")
   2981     protected int mScrollX;
   2982     /**
   2983      * The offset, in pixels, by which the content of this view is scrolled
   2984      * vertically.
   2985      * {@hide}
   2986      */
   2987     @ViewDebug.ExportedProperty(category = "scrolling")
   2988     protected int mScrollY;
   2989 
   2990     /**
   2991      * The left padding in pixels, that is the distance in pixels between the
   2992      * left edge of this view and the left edge of its content.
   2993      * {@hide}
   2994      */
   2995     @ViewDebug.ExportedProperty(category = "padding")
   2996     protected int mPaddingLeft = 0;
   2997     /**
   2998      * The right padding in pixels, that is the distance in pixels between the
   2999      * right edge of this view and the right edge of its content.
   3000      * {@hide}
   3001      */
   3002     @ViewDebug.ExportedProperty(category = "padding")
   3003     protected int mPaddingRight = 0;
   3004     /**
   3005      * The top padding in pixels, that is the distance in pixels between the
   3006      * top edge of this view and the top edge of its content.
   3007      * {@hide}
   3008      */
   3009     @ViewDebug.ExportedProperty(category = "padding")
   3010     protected int mPaddingTop;
   3011     /**
   3012      * The bottom padding in pixels, that is the distance in pixels between the
   3013      * bottom edge of this view and the bottom edge of its content.
   3014      * {@hide}
   3015      */
   3016     @ViewDebug.ExportedProperty(category = "padding")
   3017     protected int mPaddingBottom;
   3018 
   3019     /**
   3020      * The layout insets in pixels, that is the distance in pixels between the
   3021      * visible edges of this view its bounds.
   3022      */
   3023     private Insets mLayoutInsets;
   3024 
   3025     /**
   3026      * Briefly describes the view and is primarily used for accessibility support.
   3027      */
   3028     private CharSequence mContentDescription;
   3029 
   3030     /**
   3031      * Specifies the id of a view for which this view serves as a label for
   3032      * accessibility purposes.
   3033      */
   3034     private int mLabelForId = View.NO_ID;
   3035 
   3036     /**
   3037      * Predicate for matching labeled view id with its label for
   3038      * accessibility purposes.
   3039      */
   3040     private MatchLabelForPredicate mMatchLabelForPredicate;
   3041 
   3042     /**
   3043      * Predicate for matching a view by its id.
   3044      */
   3045     private MatchIdPredicate mMatchIdPredicate;
   3046 
   3047     /**
   3048      * Cache the paddingRight set by the user to append to the scrollbar's size.
   3049      *
   3050      * @hide
   3051      */
   3052     @ViewDebug.ExportedProperty(category = "padding")
   3053     protected int mUserPaddingRight;
   3054 
   3055     /**
   3056      * Cache the paddingBottom set by the user to append to the scrollbar's size.
   3057      *
   3058      * @hide
   3059      */
   3060     @ViewDebug.ExportedProperty(category = "padding")
   3061     protected int mUserPaddingBottom;
   3062 
   3063     /**
   3064      * Cache the paddingLeft set by the user to append to the scrollbar's size.
   3065      *
   3066      * @hide
   3067      */
   3068     @ViewDebug.ExportedProperty(category = "padding")
   3069     protected int mUserPaddingLeft;
   3070 
   3071     /**
   3072      * Cache the paddingStart set by the user to append to the scrollbar's size.
   3073      *
   3074      */
   3075     @ViewDebug.ExportedProperty(category = "padding")
   3076     int mUserPaddingStart;
   3077 
   3078     /**
   3079      * Cache the paddingEnd set by the user to append to the scrollbar's size.
   3080      *
   3081      */
   3082     @ViewDebug.ExportedProperty(category = "padding")
   3083     int mUserPaddingEnd;
   3084 
   3085     /**
   3086      * Cache initial left padding.
   3087      *
   3088      * @hide
   3089      */
   3090     int mUserPaddingLeftInitial;
   3091 
   3092     /**
   3093      * Cache initial right padding.
   3094      *
   3095      * @hide
   3096      */
   3097     int mUserPaddingRightInitial;
   3098 
   3099     /**
   3100      * Default undefined padding
   3101      */
   3102     private static final int UNDEFINED_PADDING = Integer.MIN_VALUE;
   3103 
   3104     /**
   3105      * Cache if a left padding has been defined
   3106      */
   3107     private boolean mLeftPaddingDefined = false;
   3108 
   3109     /**
   3110      * Cache if a right padding has been defined
   3111      */
   3112     private boolean mRightPaddingDefined = false;
   3113 
   3114     /**
   3115      * @hide
   3116      */
   3117     int mOldWidthMeasureSpec = Integer.MIN_VALUE;
   3118     /**
   3119      * @hide
   3120      */
   3121     int mOldHeightMeasureSpec = Integer.MIN_VALUE;
   3122 
   3123     private LongSparseLongArray mMeasureCache;
   3124 
   3125     @ViewDebug.ExportedProperty(deepExport = true, prefix = "bg_")
   3126     private Drawable mBackground;
   3127 
   3128     private int mBackgroundResource;
   3129     private boolean mBackgroundSizeChanged;
   3130 
   3131     static class ListenerInfo {
   3132         /**
   3133          * Listener used to dispatch focus change events.
   3134          * This field should be made private, so it is hidden from the SDK.
   3135          * {@hide}
   3136          */
   3137         protected OnFocusChangeListener mOnFocusChangeListener;
   3138 
   3139         /**
   3140          * Listeners for layout change events.
   3141          */
   3142         private ArrayList<OnLayoutChangeListener> mOnLayoutChangeListeners;
   3143 
   3144         /**
   3145          * Listeners for attach events.
   3146          */
   3147         private CopyOnWriteArrayList<OnAttachStateChangeListener> mOnAttachStateChangeListeners;
   3148 
   3149         /**
   3150          * Listener used to dispatch click events.
   3151          * This field should be made private, so it is hidden from the SDK.
   3152          * {@hide}
   3153          */
   3154         public OnClickListener mOnClickListener;
   3155 
   3156         /**
   3157          * Listener used to dispatch long click events.
   3158          * This field should be made private, so it is hidden from the SDK.
   3159          * {@hide}
   3160          */
   3161         protected OnLongClickListener mOnLongClickListener;
   3162 
   3163         /**
   3164          * Listener used to build the context menu.
   3165          * This field should be made private, so it is hidden from the SDK.
   3166          * {@hide}
   3167          */
   3168         protected OnCreateContextMenuListener mOnCreateContextMenuListener;
   3169 
   3170         private OnKeyListener mOnKeyListener;
   3171 
   3172         private OnTouchListener mOnTouchListener;
   3173 
   3174         private OnHoverListener mOnHoverListener;
   3175 
   3176         private OnGenericMotionListener mOnGenericMotionListener;
   3177 
   3178         private OnDragListener mOnDragListener;
   3179 
   3180         private OnSystemUiVisibilityChangeListener mOnSystemUiVisibilityChangeListener;
   3181     }
   3182 
   3183     ListenerInfo mListenerInfo;
   3184 
   3185     /**
   3186      * The application environment this view lives in.
   3187      * This field should be made private, so it is hidden from the SDK.
   3188      * {@hide}
   3189      */
   3190     protected Context mContext;
   3191 
   3192     private final Resources mResources;
   3193 
   3194     private ScrollabilityCache mScrollCache;
   3195 
   3196     private int[] mDrawableState = null;
   3197 
   3198     /**
   3199      * When this view has focus and the next focus is {@link #FOCUS_LEFT},
   3200      * the user may specify which view to go to next.
   3201      */
   3202     private int mNextFocusLeftId = View.NO_ID;
   3203 
   3204     /**
   3205      * When this view has focus and the next focus is {@link #FOCUS_RIGHT},
   3206      * the user may specify which view to go to next.
   3207      */
   3208     private int mNextFocusRightId = View.NO_ID;
   3209 
   3210     /**
   3211      * When this view has focus and the next focus is {@link #FOCUS_UP},
   3212      * the user may specify which view to go to next.
   3213      */
   3214     private int mNextFocusUpId = View.NO_ID;
   3215 
   3216     /**
   3217      * When this view has focus and the next focus is {@link #FOCUS_DOWN},
   3218      * the user may specify which view to go to next.
   3219      */
   3220     private int mNextFocusDownId = View.NO_ID;
   3221 
   3222     /**
   3223      * When this view has focus and the next focus is {@link #FOCUS_FORWARD},
   3224      * the user may specify which view to go to next.
   3225      */
   3226     int mNextFocusForwardId = View.NO_ID;
   3227 
   3228     private CheckForLongPress mPendingCheckForLongPress;
   3229     private CheckForTap mPendingCheckForTap = null;
   3230     private PerformClick mPerformClick;
   3231     private SendViewScrolledAccessibilityEvent mSendViewScrolledAccessibilityEvent;
   3232 
   3233     private UnsetPressedState mUnsetPressedState;
   3234 
   3235     /**
   3236      * Whether the long press's action has been invoked.  The tap's action is invoked on the
   3237      * up event while a long press is invoked as soon as the long press duration is reached, so
   3238      * a long press could be performed before the tap is checked, in which case the tap's action
   3239      * should not be invoked.
   3240      */
   3241     private boolean mHasPerformedLongPress;
   3242 
   3243     /**
   3244      * The minimum height of the view. We'll try our best to have the height
   3245      * of this view to at least this amount.
   3246      */
   3247     @ViewDebug.ExportedProperty(category = "measurement")
   3248     private int mMinHeight;
   3249 
   3250     /**
   3251      * The minimum width of the view. We'll try our best to have the width
   3252      * of this view to at least this amount.
   3253      */
   3254     @ViewDebug.ExportedProperty(category = "measurement")
   3255     private int mMinWidth;
   3256 
   3257     /**
   3258      * The delegate to handle touch events that are physically in this view
   3259      * but should be handled by another view.
   3260      */
   3261     private TouchDelegate mTouchDelegate = null;
   3262 
   3263     /**
   3264      * Solid color to use as a background when creating the drawing cache. Enables
   3265      * the cache to use 16 bit bitmaps instead of 32 bit.
   3266      */
   3267     private int mDrawingCacheBackgroundColor = 0;
   3268 
   3269     /**
   3270      * Special tree observer used when mAttachInfo is null.
   3271      */
   3272     private ViewTreeObserver mFloatingTreeObserver;
   3273 
   3274     /**
   3275      * Cache the touch slop from the context that created the view.
   3276      */
   3277     private int mTouchSlop;
   3278 
   3279     /**
   3280      * Object that handles automatic animation of view properties.
   3281      */
   3282     private ViewPropertyAnimator mAnimator = null;
   3283 
   3284     /**
   3285      * Flag indicating that a drag can cross window boundaries.  When
   3286      * {@link #startDrag(ClipData, DragShadowBuilder, Object, int)} is called
   3287      * with this flag set, all visible applications will be able to participate
   3288      * in the drag operation and receive the dragged content.
   3289      *
   3290      * @hide
   3291      */
   3292     public static final int DRAG_FLAG_GLOBAL = 1;
   3293 
   3294     /**
   3295      * Vertical scroll factor cached by {@link #getVerticalScrollFactor}.
   3296      */
   3297     private float mVerticalScrollFactor;
   3298 
   3299     /**
   3300      * Position of the vertical scroll bar.
   3301      */
   3302     private int mVerticalScrollbarPosition;
   3303 
   3304     /**
   3305      * Position the scroll bar at the default position as determined by the system.
   3306      */
   3307     public static final int SCROLLBAR_POSITION_DEFAULT = 0;
   3308 
   3309     /**
   3310      * Position the scroll bar along the left edge.
   3311      */
   3312     public static final int SCROLLBAR_POSITION_LEFT = 1;
   3313 
   3314     /**
   3315      * Position the scroll bar along the right edge.
   3316      */
   3317     public static final int SCROLLBAR_POSITION_RIGHT = 2;
   3318 
   3319     /**
   3320      * Indicates that the view does not have a layer.
   3321      *
   3322      * @see #getLayerType()
   3323      * @see #setLayerType(int, android.graphics.Paint)
   3324      * @see #LAYER_TYPE_SOFTWARE
   3325      * @see #LAYER_TYPE_HARDWARE
   3326      */
   3327     public static final int LAYER_TYPE_NONE = 0;
   3328 
   3329     /**
   3330      * <p>Indicates that the view has a software layer. A software layer is backed
   3331      * by a bitmap and causes the view to be rendered using Android's software
   3332      * rendering pipeline, even if hardware acceleration is enabled.</p>
   3333      *
   3334      * <p>Software layers have various usages:</p>
   3335      * <p>When the application is not using hardware acceleration, a software layer
   3336      * is useful to apply a specific color filter and/or blending mode and/or
   3337      * translucency to a view and all its children.</p>
   3338      * <p>When the application is using hardware acceleration, a software layer
   3339      * is useful to render drawing primitives not supported by the hardware
   3340      * accelerated pipeline. It can also be used to cache a complex view tree
   3341      * into a texture and reduce the complexity of drawing operations. For instance,
   3342      * when animating a complex view tree with a translation, a software layer can
   3343      * be used to render the view tree only once.</p>
   3344      * <p>Software layers should be avoided when the affected view tree updates
   3345      * often. Every update will require to re-render the software layer, which can
   3346      * potentially be slow (particularly when hardware acceleration is turned on
   3347      * since the layer will have to be uploaded into a hardware texture after every
   3348      * update.)</p>
   3349      *
   3350      * @see #getLayerType()
   3351      * @see #setLayerType(int, android.graphics.Paint)
   3352      * @see #LAYER_TYPE_NONE
   3353      * @see #LAYER_TYPE_HARDWARE
   3354      */
   3355     public static final int LAYER_TYPE_SOFTWARE = 1;
   3356 
   3357     /**
   3358      * <p>Indicates that the view has a hardware layer. A hardware layer is backed
   3359      * by a hardware specific texture (generally Frame Buffer Objects or FBO on
   3360      * OpenGL hardware) and causes the view to be rendered using Android's hardware
   3361      * rendering pipeline, but only if hardware acceleration is turned on for the
   3362      * view hierarchy. When hardware acceleration is turned off, hardware layers
   3363      * behave exactly as {@link #LAYER_TYPE_SOFTWARE software layers}.</p>
   3364      *
   3365      * <p>A hardware layer is useful to apply a specific color filter and/or
   3366      * blending mode and/or translucency to a view and all its children.</p>
   3367      * <p>A hardware layer can be used to cache a complex view tree into a
   3368      * texture and reduce the complexity of drawing operations. For instance,
   3369      * when animating a complex view tree with a translation, a hardware layer can
   3370      * be used to render the view tree only once.</p>
   3371      * <p>A hardware layer can also be used to increase the rendering quality when
   3372      * rotation transformations are applied on a view. It can also be used to
   3373      * prevent potential clipping issues when applying 3D transforms on a view.</p>
   3374      *
   3375      * @see #getLayerType()
   3376      * @see #setLayerType(int, android.graphics.Paint)
   3377      * @see #LAYER_TYPE_NONE
   3378      * @see #LAYER_TYPE_SOFTWARE
   3379      */
   3380     public static final int LAYER_TYPE_HARDWARE = 2;
   3381 
   3382     @ViewDebug.ExportedProperty(category = "drawing", mapping = {
   3383             @ViewDebug.IntToString(from = LAYER_TYPE_NONE, to = "NONE"),
   3384             @ViewDebug.IntToString(from = LAYER_TYPE_SOFTWARE, to = "SOFTWARE"),
   3385             @ViewDebug.IntToString(from = LAYER_TYPE_HARDWARE, to = "HARDWARE")
   3386     })
   3387     int mLayerType = LAYER_TYPE_NONE;
   3388     Paint mLayerPaint;
   3389     Rect mLocalDirtyRect;
   3390     private HardwareLayer mHardwareLayer;
   3391 
   3392     /**
   3393      * Set to true when drawing cache is enabled and cannot be created.
   3394      *
   3395      * @hide
   3396      */
   3397     public boolean mCachingFailed;
   3398     private Bitmap mDrawingCache;
   3399     private Bitmap mUnscaledDrawingCache;
   3400 
   3401     DisplayList mDisplayList;
   3402 
   3403     /**
   3404      * Set to true when the view is sending hover accessibility events because it
   3405      * is the innermost hovered view.
   3406      */
   3407     private boolean mSendingHoverAccessibilityEvents;
   3408 
   3409     /**
   3410      * Delegate for injecting accessibility functionality.
   3411      */
   3412     AccessibilityDelegate mAccessibilityDelegate;
   3413 
   3414     /**
   3415      * The view's overlay layer. Developers get a reference to the overlay via getOverlay()
   3416      * and add/remove objects to/from the overlay directly through the Overlay methods.
   3417      */
   3418     ViewOverlay mOverlay;
   3419 
   3420     /**
   3421      * Consistency verifier for debugging purposes.
   3422      * @hide
   3423      */
   3424     protected final InputEventConsistencyVerifier mInputEventConsistencyVerifier =
   3425             InputEventConsistencyVerifier.isInstrumentationEnabled() ?
   3426                     new InputEventConsistencyVerifier(this, 0) : null;
   3427 
   3428     private static final AtomicInteger sNextGeneratedId = new AtomicInteger(1);
   3429 
   3430     /**
   3431      * Simple constructor to use when creating a view from code.
   3432      *
   3433      * @param context The Context the view is running in, through which it can
   3434      *        access the current theme, resources, etc.
   3435      */
   3436     public View(Context context) {
   3437         mContext = context;
   3438         mResources = context != null ? context.getResources() : null;
   3439         mViewFlags = SOUND_EFFECTS_ENABLED | HAPTIC_FEEDBACK_ENABLED;
   3440         // Set some flags defaults
   3441         mPrivateFlags2 =
   3442                 (LAYOUT_DIRECTION_DEFAULT << PFLAG2_LAYOUT_DIRECTION_MASK_SHIFT) |
   3443                 (TEXT_DIRECTION_DEFAULT << PFLAG2_TEXT_DIRECTION_MASK_SHIFT) |
   3444                 (PFLAG2_TEXT_DIRECTION_RESOLVED_DEFAULT) |
   3445                 (TEXT_ALIGNMENT_DEFAULT << PFLAG2_TEXT_ALIGNMENT_MASK_SHIFT) |
   3446                 (PFLAG2_TEXT_ALIGNMENT_RESOLVED_DEFAULT) |
   3447                 (IMPORTANT_FOR_ACCESSIBILITY_DEFAULT << PFLAG2_IMPORTANT_FOR_ACCESSIBILITY_SHIFT);
   3448         mTouchSlop = ViewConfiguration.get(context).getScaledTouchSlop();
   3449         setOverScrollMode(OVER_SCROLL_IF_CONTENT_SCROLLS);
   3450         mUserPaddingStart = UNDEFINED_PADDING;
   3451         mUserPaddingEnd = UNDEFINED_PADDING;
   3452 
   3453         if (!sCompatibilityDone && context != null) {
   3454             final int targetSdkVersion = context.getApplicationInfo().targetSdkVersion;
   3455 
   3456             // Older apps may need this compatibility hack for measurement.
   3457             sUseBrokenMakeMeasureSpec = targetSdkVersion <= JELLY_BEAN_MR1;
   3458 
   3459             // Older apps expect onMeasure() to always be called on a layout pass, regardless
   3460             // of whether a layout was requested on that View.
   3461             sIgnoreMeasureCache = targetSdkVersion < KITKAT;
   3462 
   3463             sCompatibilityDone = true;
   3464         }
   3465     }
   3466 
   3467     /**
   3468      * Constructor that is called when inflating a view from XML. This is called
   3469      * when a view is being constructed from an XML file, supplying attributes
   3470      * that were specified in the XML file. This version uses a default style of
   3471      * 0, so the only attribute values applied are those in the Context's Theme
   3472      * and the given AttributeSet.
   3473      *
   3474      * <p>
   3475      * The method onFinishInflate() will be called after all children have been
   3476      * added.
   3477      *
   3478      * @param context The Context the view is running in, through which it can
   3479      *        access the current theme, resources, etc.
   3480      * @param attrs The attributes of the XML tag that is inflating the view.
   3481      * @see #View(Context, AttributeSet, int)
   3482      */
   3483     public View(Context context, AttributeSet attrs) {
   3484         this(context, attrs, 0);
   3485     }
   3486 
   3487     /**
   3488      * Perform inflation from XML and apply a class-specific base style. This
   3489      * constructor of View allows subclasses to use their own base style when
   3490      * they are inflating. For example, a Button class's constructor would call
   3491      * this version of the super class constructor and supply
   3492      * <code>R.attr.buttonStyle</code> for <var>defStyle</var>; this allows
   3493      * the theme's button style to modify all of the base view attributes (in
   3494      * particular its background) as well as the Button class's attributes.
   3495      *
   3496      * @param context The Context the view is running in, through which it can
   3497      *        access the current theme, resources, etc.
   3498      * @param attrs The attributes of the XML tag that is inflating the view.
   3499      * @param defStyleAttr An attribute in the current theme that contains a
   3500      *        reference to a style resource to apply to this view. If 0, no
   3501      *        default style will be applied.
   3502      * @see #View(Context, AttributeSet)
   3503      */
   3504     public View(Context context, AttributeSet attrs, int defStyleAttr) {
   3505         this(context);
   3506 
   3507         TypedArray a = context.obtainStyledAttributes(attrs, com.android.internal.R.styleable.View,
   3508                 defStyleAttr, 0);
   3509 
   3510         Drawable background = null;
   3511 
   3512         int leftPadding = -1;
   3513         int topPadding = -1;
   3514         int rightPadding = -1;
   3515         int bottomPadding = -1;
   3516         int startPadding = UNDEFINED_PADDING;
   3517         int endPadding = UNDEFINED_PADDING;
   3518 
   3519         int padding = -1;
   3520 
   3521         int viewFlagValues = 0;
   3522         int viewFlagMasks = 0;
   3523 
   3524         boolean setScrollContainer = false;
   3525 
   3526         int x = 0;
   3527         int y = 0;
   3528 
   3529         float tx = 0;
   3530         float ty = 0;
   3531         float rotation = 0;
   3532         float rotationX = 0;
   3533         float rotationY = 0;
   3534         float sx = 1f;
   3535         float sy = 1f;
   3536         boolean transformSet = false;
   3537 
   3538         int scrollbarStyle = SCROLLBARS_INSIDE_OVERLAY;
   3539         int overScrollMode = mOverScrollMode;
   3540         boolean initializeScrollbars = false;
   3541 
   3542         boolean startPaddingDefined = false;
   3543         boolean endPaddingDefined = false;
   3544         boolean leftPaddingDefined = false;
   3545         boolean rightPaddingDefined = false;
   3546 
   3547         final int targetSdkVersion = context.getApplicationInfo().targetSdkVersion;
   3548 
   3549         final int N = a.getIndexCount();
   3550         for (int i = 0; i < N; i++) {
   3551             int attr = a.getIndex(i);
   3552             switch (attr) {
   3553                 case com.android.internal.R.styleable.View_background:
   3554                     background = a.getDrawable(attr);
   3555                     break;
   3556                 case com.android.internal.R.styleable.View_padding:
   3557                     padding = a.getDimensionPixelSize(attr, -1);
   3558                     mUserPaddingLeftInitial = padding;
   3559                     mUserPaddingRightInitial = padding;
   3560                     leftPaddingDefined = true;
   3561                     rightPaddingDefined = true;
   3562                     break;
   3563                  case com.android.internal.R.styleable.View_paddingLeft:
   3564                     leftPadding = a.getDimensionPixelSize(attr, -1);
   3565                     mUserPaddingLeftInitial = leftPadding;
   3566                     leftPaddingDefined = true;
   3567                     break;
   3568                 case com.android.internal.R.styleable.View_paddingTop:
   3569                     topPadding = a.getDimensionPixelSize(attr, -1);
   3570                     break;
   3571                 case com.android.internal.R.styleable.View_paddingRight:
   3572                     rightPadding = a.getDimensionPixelSize(attr, -1);
   3573                     mUserPaddingRightInitial = rightPadding;
   3574                     rightPaddingDefined = true;
   3575                     break;
   3576                 case com.android.internal.R.styleable.View_paddingBottom:
   3577                     bottomPadding = a.getDimensionPixelSize(attr, -1);
   3578                     break;
   3579                 case com.android.internal.R.styleable.View_paddingStart:
   3580                     startPadding = a.getDimensionPixelSize(attr, UNDEFINED_PADDING);
   3581                     startPaddingDefined = (startPadding != UNDEFINED_PADDING);
   3582                     break;
   3583                 case com.android.internal.R.styleable.View_paddingEnd:
   3584                     endPadding = a.getDimensionPixelSize(attr, UNDEFINED_PADDING);
   3585                     endPaddingDefined = (endPadding != UNDEFINED_PADDING);
   3586                     break;
   3587                 case com.android.internal.R.styleable.View_scrollX:
   3588                     x = a.getDimensionPixelOffset(attr, 0);
   3589                     break;
   3590                 case com.android.internal.R.styleable.View_scrollY:
   3591                     y = a.getDimensionPixelOffset(attr, 0);
   3592                     break;
   3593                 case com.android.internal.R.styleable.View_alpha:
   3594                     setAlpha(a.getFloat(attr, 1f));
   3595                     break;
   3596                 case com.android.internal.R.styleable.View_transformPivotX:
   3597                     setPivotX(a.getDimensionPixelOffset(attr, 0));
   3598                     break;
   3599                 case com.android.internal.R.styleable.View_transformPivotY:
   3600                     setPivotY(a.getDimensionPixelOffset(attr, 0));
   3601                     break;
   3602                 case com.android.internal.R.styleable.View_translationX:
   3603                     tx = a.getDimensionPixelOffset(attr, 0);
   3604                     transformSet = true;
   3605                     break;
   3606                 case com.android.internal.R.styleable.View_translationY:
   3607                     ty = a.getDimensionPixelOffset(attr, 0);
   3608                     transformSet = true;
   3609                     break;
   3610                 case com.android.internal.R.styleable.View_rotation:
   3611                     rotation = a.getFloat(attr, 0);
   3612                     transformSet = true;
   3613                     break;
   3614                 case com.android.internal.R.styleable.View_rotationX:
   3615                     rotationX = a.getFloat(attr, 0);
   3616                     transformSet = true;
   3617                     break;
   3618                 case com.android.internal.R.styleable.View_rotationY:
   3619                     rotationY = a.getFloat(attr, 0);
   3620                     transformSet = true;
   3621                     break;
   3622                 case com.android.internal.R.styleable.View_scaleX:
   3623                     sx = a.getFloat(attr, 1f);
   3624                     transformSet = true;
   3625                     break;
   3626                 case com.android.internal.R.styleable.View_scaleY:
   3627                     sy = a.getFloat(attr, 1f);
   3628                     transformSet = true;
   3629                     break;
   3630                 case com.android.internal.R.styleable.View_id:
   3631                     mID = a.getResourceId(attr, NO_ID);
   3632                     break;
   3633                 case com.android.internal.R.styleable.View_tag:
   3634                     mTag = a.getText(attr);
   3635                     break;
   3636                 case com.android.internal.R.styleable.View_fitsSystemWindows:
   3637                     if (a.getBoolean(attr, false)) {
   3638                         viewFlagValues |= FITS_SYSTEM_WINDOWS;
   3639                         viewFlagMasks |= FITS_SYSTEM_WINDOWS;
   3640                     }
   3641                     break;
   3642                 case com.android.internal.R.styleable.View_focusable:
   3643                     if (a.getBoolean(attr, false)) {
   3644                         viewFlagValues |= FOCUSABLE;
   3645                         viewFlagMasks |= FOCUSABLE_MASK;
   3646                     }
   3647                     break;
   3648                 case com.android.internal.R.styleable.View_focusableInTouchMode:
   3649                     if (a.getBoolean(attr, false)) {
   3650                         viewFlagValues |= FOCUSABLE_IN_TOUCH_MODE | FOCUSABLE;
   3651                         viewFlagMasks |= FOCUSABLE_IN_TOUCH_MODE | FOCUSABLE_MASK;
   3652                     }
   3653                     break;
   3654                 case com.android.internal.R.styleable.View_clickable:
   3655                     if (a.getBoolean(attr, false)) {
   3656                         viewFlagValues |= CLICKABLE;
   3657                         viewFlagMasks |= CLICKABLE;
   3658                     }
   3659                     break;
   3660                 case com.android.internal.R.styleable.View_longClickable:
   3661                     if (a.getBoolean(attr, false)) {
   3662                         viewFlagValues |= LONG_CLICKABLE;
   3663                         viewFlagMasks |= LONG_CLICKABLE;
   3664                     }
   3665                     break;
   3666                 case com.android.internal.R.styleable.View_saveEnabled:
   3667                     if (!a.getBoolean(attr, true)) {
   3668                         viewFlagValues |= SAVE_DISABLED;
   3669                         viewFlagMasks |= SAVE_DISABLED_MASK;
   3670                     }
   3671                     break;
   3672                 case com.android.internal.R.styleable.View_duplicateParentState:
   3673                     if (a.getBoolean(attr, false)) {
   3674                         viewFlagValues |= DUPLICATE_PARENT_STATE;
   3675                         viewFlagMasks |= DUPLICATE_PARENT_STATE;
   3676                     }
   3677                     break;
   3678                 case com.android.internal.R.styleable.View_visibility:
   3679                     final int visibility = a.getInt(attr, 0);
   3680                     if (visibility != 0) {
   3681                         viewFlagValues |= VISIBILITY_FLAGS[visibility];
   3682                         viewFlagMasks |= VISIBILITY_MASK;
   3683                     }
   3684                     break;
   3685                 case com.android.internal.R.styleable.View_layoutDirection:
   3686                     // Clear any layout direction flags (included resolved bits) already set
   3687                     mPrivateFlags2 &=
   3688                             ~(PFLAG2_LAYOUT_DIRECTION_MASK | PFLAG2_LAYOUT_DIRECTION_RESOLVED_MASK);
   3689                     // Set the layout direction flags depending on the value of the attribute
   3690                     final int layoutDirection = a.getInt(attr, -1);
   3691                     final int value = (layoutDirection != -1) ?
   3692                             LAYOUT_DIRECTION_FLAGS[layoutDirection] : LAYOUT_DIRECTION_DEFAULT;
   3693                     mPrivateFlags2 |= (value << PFLAG2_LAYOUT_DIRECTION_MASK_SHIFT);
   3694                     break;
   3695                 case com.android.internal.R.styleable.View_drawingCacheQuality:
   3696                     final int cacheQuality = a.getInt(attr, 0);
   3697                     if (cacheQuality != 0) {
   3698                         viewFlagValues |= DRAWING_CACHE_QUALITY_FLAGS[cacheQuality];
   3699                         viewFlagMasks |= DRAWING_CACHE_QUALITY_MASK;
   3700                     }
   3701                     break;
   3702                 case com.android.internal.R.styleable.View_contentDescription:
   3703                     setContentDescription(a.getString(attr));
   3704                     break;
   3705                 case com.android.internal.R.styleable.View_labelFor:
   3706                     setLabelFor(a.getResourceId(attr, NO_ID));
   3707                     break;
   3708                 case com.android.internal.R.styleable.View_soundEffectsEnabled:
   3709                     if (!a.getBoolean(attr, true)) {
   3710                         viewFlagValues &= ~SOUND_EFFECTS_ENABLED;
   3711                         viewFlagMasks |= SOUND_EFFECTS_ENABLED;
   3712                     }
   3713                     break;
   3714                 case com.android.internal.R.styleable.View_hapticFeedbackEnabled:
   3715                     if (!a.getBoolean(attr, true)) {
   3716                         viewFlagValues &= ~HAPTIC_FEEDBACK_ENABLED;
   3717                         viewFlagMasks |= HAPTIC_FEEDBACK_ENABLED;
   3718                     }
   3719                     break;
   3720                 case R.styleable.View_scrollbars:
   3721                     final int scrollbars = a.getInt(attr, SCROLLBARS_NONE);
   3722                     if (scrollbars != SCROLLBARS_NONE) {
   3723                         viewFlagValues |= scrollbars;
   3724                         viewFlagMasks |= SCROLLBARS_MASK;
   3725                         initializeScrollbars = true;
   3726                     }
   3727                     break;
   3728                 //noinspection deprecation
   3729                 case R.styleable.View_fadingEdge:
   3730                     if (targetSdkVersion >= ICE_CREAM_SANDWICH) {
   3731                         // Ignore the attribute starting with ICS
   3732                         break;
   3733                     }
   3734                     // With builds < ICS, fall through and apply fading edges
   3735                 case R.styleable.View_requiresFadingEdge:
   3736                     final int fadingEdge = a.getInt(attr, FADING_EDGE_NONE);
   3737                     if (fadingEdge != FADING_EDGE_NONE) {
   3738                         viewFlagValues |= fadingEdge;
   3739                         viewFlagMasks |= FADING_EDGE_MASK;
   3740                         initializeFadingEdge(a);
   3741                     }
   3742                     break;
   3743                 case R.styleable.View_scrollbarStyle:
   3744                     scrollbarStyle = a.getInt(attr, SCROLLBARS_INSIDE_OVERLAY);
   3745                     if (scrollbarStyle != SCROLLBARS_INSIDE_OVERLAY) {
   3746                         viewFlagValues |= scrollbarStyle & SCROLLBARS_STYLE_MASK;
   3747                         viewFlagMasks |= SCROLLBARS_STYLE_MASK;
   3748                     }
   3749                     break;
   3750                 case R.styleable.View_isScrollContainer:
   3751                     setScrollContainer = true;
   3752                     if (a.getBoolean(attr, false)) {
   3753                         setScrollContainer(true);
   3754                     }
   3755                     break;
   3756                 case com.android.internal.R.styleable.View_keepScreenOn:
   3757                     if (a.getBoolean(attr, false)) {
   3758                         viewFlagValues |= KEEP_SCREEN_ON;
   3759                         viewFlagMasks |= KEEP_SCREEN_ON;
   3760                     }
   3761                     break;
   3762                 case R.styleable.View_filterTouchesWhenObscured:
   3763                     if (a.getBoolean(attr, false)) {
   3764                         viewFlagValues |= FILTER_TOUCHES_WHEN_OBSCURED;
   3765                         viewFlagMasks |= FILTER_TOUCHES_WHEN_OBSCURED;
   3766                     }
   3767                     break;
   3768                 case R.styleable.View_nextFocusLeft:
   3769                     mNextFocusLeftId = a.getResourceId(attr, View.NO_ID);
   3770                     break;
   3771                 case R.styleable.View_nextFocusRight:
   3772                     mNextFocusRightId = a.getResourceId(attr, View.NO_ID);
   3773                     break;
   3774                 case R.styleable.View_nextFocusUp:
   3775                     mNextFocusUpId = a.getResourceId(attr, View.NO_ID);
   3776                     break;
   3777                 case R.styleable.View_nextFocusDown:
   3778                     mNextFocusDownId = a.getResourceId(attr, View.NO_ID);
   3779                     break;
   3780                 case R.styleable.View_nextFocusForward:
   3781                     mNextFocusForwardId = a.getResourceId(attr, View.NO_ID);
   3782                     break;
   3783                 case R.styleable.View_minWidth:
   3784                     mMinWidth = a.getDimensionPixelSize(attr, 0);
   3785                     break;
   3786                 case R.styleable.View_minHeight:
   3787                     mMinHeight = a.getDimensionPixelSize(attr, 0);
   3788                     break;
   3789                 case R.styleable.View_onClick:
   3790                     if (context.isRestricted()) {
   3791                         throw new IllegalStateException("The android:onClick attribute cannot "
   3792                                 + "be used within a restricted context");
   3793                     }
   3794 
   3795                     final String handlerName = a.getString(attr);
   3796                     if (handlerName != null) {
   3797                         setOnClickListener(new OnClickListener() {
   3798                             private Method mHandler;
   3799 
   3800                             public void onClick(View v) {
   3801                                 if (mHandler == null) {
   3802                                     try {
   3803                                         mHandler = getContext().getClass().getMethod(handlerName,
   3804                                                 View.class);
   3805                                     } catch (NoSuchMethodException e) {
   3806                                         int id = getId();
   3807                                         String idText = id == NO_ID ? "" : " with id '"
   3808                                                 + getContext().getResources().getResourceEntryName(
   3809                                                     id) + "'";
   3810                                         throw new IllegalStateException("Could not find a method " +
   3811                                                 handlerName + "(View) in the activity "
   3812                                                 + getContext().getClass() + " for onClick handler"
   3813                                                 + " on view " + View.this.getClass() + idText, e);
   3814                                     }
   3815                                 }
   3816 
   3817                                 try {
   3818                                     mHandler.invoke(getContext(), View.this);
   3819                                 } catch (IllegalAccessException e) {
   3820                                     throw new IllegalStateException("Could not execute non "
   3821                                             + "public method of the activity", e);
   3822                                 } catch (InvocationTargetException e) {
   3823                                     throw new IllegalStateException("Could not execute "
   3824                                             + "method of the activity", e);
   3825                                 }
   3826                             }
   3827                         });
   3828                     }
   3829                     break;
   3830                 case R.styleable.View_overScrollMode:
   3831                     overScrollMode = a.getInt(attr, OVER_SCROLL_IF_CONTENT_SCROLLS);
   3832                     break;
   3833                 case R.styleable.View_verticalScrollbarPosition:
   3834                     mVerticalScrollbarPosition = a.getInt(attr, SCROLLBAR_POSITION_DEFAULT);
   3835                     break;
   3836                 case R.styleable.View_layerType:
   3837                     setLayerType(a.getInt(attr, LAYER_TYPE_NONE), null);
   3838                     break;
   3839                 case R.styleable.View_textDirection:
   3840                     // Clear any text direction flag already set
   3841                     mPrivateFlags2 &= ~PFLAG2_TEXT_DIRECTION_MASK;
   3842                     // Set the text direction flags depending on the value of the attribute
   3843                     final int textDirection = a.getInt(attr, -1);
   3844                     if (textDirection != -1) {
   3845                         mPrivateFlags2 |= PFLAG2_TEXT_DIRECTION_FLAGS[textDirection];
   3846                     }
   3847                     break;
   3848                 case R.styleable.View_textAlignment:
   3849                     // Clear any text alignment flag already set
   3850                     mPrivateFlags2 &= ~PFLAG2_TEXT_ALIGNMENT_MASK;
   3851                     // Set the text alignment flag depending on the value of the attribute
   3852                     final int textAlignment = a.getInt(attr, TEXT_ALIGNMENT_DEFAULT);
   3853                     mPrivateFlags2 |= PFLAG2_TEXT_ALIGNMENT_FLAGS[textAlignment];
   3854                     break;
   3855                 case R.styleable.View_importantForAccessibility:
   3856                     setImportantForAccessibility(a.getInt(attr,
   3857                             IMPORTANT_FOR_ACCESSIBILITY_DEFAULT));
   3858                     break;
   3859                 case R.styleable.View_accessibilityLiveRegion:
   3860                     setAccessibilityLiveRegion(a.getInt(attr, ACCESSIBILITY_LIVE_REGION_DEFAULT));
   3861                     break;
   3862             }
   3863         }
   3864 
   3865         setOverScrollMode(overScrollMode);
   3866 
   3867         // Cache start/end user padding as we cannot fully resolve padding here (we dont have yet
   3868         // the resolved layout direction). Those cached values will be used later during padding
   3869         // resolution.
   3870         mUserPaddingStart = startPadding;
   3871         mUserPaddingEnd = endPadding;
   3872 
   3873         if (background != null) {
   3874             setBackground(background);
   3875         }
   3876 
   3877         // setBackground above will record that padding is currently provided by the background.
   3878         // If we have padding specified via xml, record that here instead and use it.
   3879         mLeftPaddingDefined = leftPaddingDefined;
   3880         mRightPaddingDefined = rightPaddingDefined;
   3881 
   3882         if (padding >= 0) {
   3883             leftPadding = padding;
   3884             topPadding = padding;
   3885             rightPadding = padding;
   3886             bottomPadding = padding;
   3887             mUserPaddingLeftInitial = padding;
   3888             mUserPaddingRightInitial = padding;
   3889         }
   3890 
   3891         if (isRtlCompatibilityMode()) {
   3892             // RTL compatibility mode: pre Jelly Bean MR1 case OR no RTL support case.
   3893             // left / right padding are used if defined (meaning here nothing to do). If they are not
   3894             // defined and start / end padding are defined (e.g. in Frameworks resources), then we use
   3895             // start / end and resolve them as left / right (layout direction is not taken into account).
   3896             // Padding from the background drawable is stored at this point in mUserPaddingLeftInitial
   3897             // and mUserPaddingRightInitial) so drawable padding will be used as ultimate default if
   3898             // defined.
   3899             if (!mLeftPaddingDefined && startPaddingDefined) {
   3900                 leftPadding = startPadding;
   3901             }
   3902             mUserPaddingLeftInitial = (leftPadding >= 0) ? leftPadding : mUserPaddingLeftInitial;
   3903             if (!mRightPaddingDefined && endPaddingDefined) {
   3904                 rightPadding = endPadding;
   3905             }
   3906             mUserPaddingRightInitial = (rightPadding >= 0) ? rightPadding : mUserPaddingRightInitial;
   3907         } else {
   3908             // Jelly Bean MR1 and after case: if start/end defined, they will override any left/right
   3909             // values defined. Otherwise, left /right values are used.
   3910             // Padding from the background drawable is stored at this point in mUserPaddingLeftInitial
   3911             // and mUserPaddingRightInitial) so drawable padding will be used as ultimate default if
   3912             // defined.
   3913             final boolean hasRelativePadding = startPaddingDefined || endPaddingDefined;
   3914 
   3915             if (mLeftPaddingDefined && !hasRelativePadding) {
   3916                 mUserPaddingLeftInitial = leftPadding;
   3917             }
   3918             if (mRightPaddingDefined && !hasRelativePadding) {
   3919                 mUserPaddingRightInitial = rightPadding;
   3920             }
   3921         }
   3922 
   3923         internalSetPadding(
   3924                 mUserPaddingLeftInitial,
   3925                 topPadding >= 0 ? topPadding : mPaddingTop,
   3926                 mUserPaddingRightInitial,
   3927                 bottomPadding >= 0 ? bottomPadding : mPaddingBottom);
   3928 
   3929         if (viewFlagMasks != 0) {
   3930             setFlags(viewFlagValues, viewFlagMasks);
   3931         }
   3932 
   3933         if (initializeScrollbars) {
   3934             initializeScrollbars(a);
   3935         }
   3936 
   3937         a.recycle();
   3938 
   3939         // Needs to be called after mViewFlags is set
   3940         if (scrollbarStyle != SCROLLBARS_INSIDE_OVERLAY) {
   3941             recomputePadding();
   3942         }
   3943 
   3944         if (x != 0 || y != 0) {
   3945             scrollTo(x, y);
   3946         }
   3947 
   3948         if (transformSet) {
   3949             setTranslationX(tx);
   3950             setTranslationY(ty);
   3951             setRotation(rotation);
   3952             setRotationX(rotationX);
   3953             setRotationY(rotationY);
   3954             setScaleX(sx);
   3955             setScaleY(sy);
   3956         }
   3957 
   3958         if (!setScrollContainer && (viewFlagValues&SCROLLBARS_VERTICAL) != 0) {
   3959             setScrollContainer(true);
   3960         }
   3961 
   3962         computeOpaqueFlags();
   3963     }
   3964 
   3965     /**
   3966      * Non-public constructor for use in testing
   3967      */
   3968     View() {
   3969         mResources = null;
   3970     }
   3971 
   3972     public String toString() {
   3973         StringBuilder out = new StringBuilder(128);
   3974         out.append(getClass().getName());
   3975         out.append('{');
   3976         out.append(Integer.toHexString(System.identityHashCode(this)));
   3977         out.append(' ');
   3978         switch (mViewFlags&VISIBILITY_MASK) {
   3979             case VISIBLE: out.append('V'); break;
   3980             case INVISIBLE: out.append('I'); break;
   3981             case GONE: out.append('G'); break;
   3982             default: out.append('.'); break;
   3983         }
   3984         out.append((mViewFlags&FOCUSABLE_MASK) == FOCUSABLE ? 'F' : '.');
   3985         out.append((mViewFlags&ENABLED_MASK) == ENABLED ? 'E' : '.');
   3986         out.append((mViewFlags&DRAW_MASK) == WILL_NOT_DRAW ? '.' : 'D');
   3987         out.append((mViewFlags&SCROLLBARS_HORIZONTAL) != 0 ? 'H' : '.');
   3988         out.append((mViewFlags&SCROLLBARS_VERTICAL) != 0 ? 'V' : '.');
   3989         out.append((mViewFlags&CLICKABLE) != 0 ? 'C' : '.');
   3990         out.append((mViewFlags&LONG_CLICKABLE) != 0 ? 'L' : '.');
   3991         out.append(' ');
   3992         out.append((mPrivateFlags&PFLAG_IS_ROOT_NAMESPACE) != 0 ? 'R' : '.');
   3993         out.append((mPrivateFlags&PFLAG_FOCUSED) != 0 ? 'F' : '.');
   3994         out.append((mPrivateFlags&PFLAG_SELECTED) != 0 ? 'S' : '.');
   3995         if ((mPrivateFlags&PFLAG_PREPRESSED) != 0) {
   3996             out.append('p');
   3997         } else {
   3998             out.append((mPrivateFlags&PFLAG_PRESSED) != 0 ? 'P' : '.');
   3999         }
   4000         out.append((mPrivateFlags&PFLAG_HOVERED) != 0 ? 'H' : '.');
   4001         out.append((mPrivateFlags&PFLAG_ACTIVATED) != 0 ? 'A' : '.');
   4002         out.append((mPrivateFlags&PFLAG_INVALIDATED) != 0 ? 'I' : '.');
   4003         out.append((mPrivateFlags&PFLAG_DIRTY_MASK) != 0 ? 'D' : '.');
   4004         out.append(' ');
   4005         out.append(mLeft);
   4006         out.append(',');
   4007         out.append(mTop);
   4008         out.append('-');
   4009         out.append(mRight);
   4010         out.append(',');
   4011         out.append(mBottom);
   4012         final int id = getId();
   4013         if (id != NO_ID) {
   4014             out.append(" #");
   4015             out.append(Integer.toHexString(id));
   4016             final Resources r = mResources;
   4017             if (id != 0 && r != null) {
   4018                 try {
   4019                     String pkgname;
   4020                     switch (id&0xff000000) {
   4021                         case 0x7f000000:
   4022                             pkgname="app";
   4023                             break;
   4024                         case 0x01000000:
   4025                             pkgname="android";
   4026                             break;
   4027                         default:
   4028                             pkgname = r.getResourcePackageName(id);
   4029                             break;
   4030                     }
   4031                     String typename = r.getResourceTypeName(id);
   4032                     String entryname = r.getResourceEntryName(id);
   4033                     out.append(" ");
   4034                     out.append(pkgname);
   4035                     out.append(":");
   4036                     out.append(typename);
   4037                     out.append("/");
   4038                     out.append(entryname);
   4039                 } catch (Resources.NotFoundException e) {
   4040                 }
   4041             }
   4042         }
   4043         out.append("}");
   4044         return out.toString();
   4045     }
   4046 
   4047     /**
   4048      * <p>
   4049      * Initializes the fading edges from a given set of styled attributes. This
   4050      * method should be called by subclasses that need fading edges and when an
   4051      * instance of these subclasses is created programmatically rather than
   4052      * being inflated from XML. This method is automatically called when the XML
   4053      * is inflated.
   4054      * </p>
   4055      *
   4056      * @param a the styled attributes set to initialize the fading edges from
   4057      */
   4058     protected void initializeFadingEdge(TypedArray a) {
   4059         initScrollCache();
   4060 
   4061         mScrollCache.fadingEdgeLength = a.getDimensionPixelSize(
   4062                 R.styleable.View_fadingEdgeLength,
   4063                 ViewConfiguration.get(mContext).getScaledFadingEdgeLength());
   4064     }
   4065 
   4066     /**
   4067      * Returns the size of the vertical faded edges used to indicate that more
   4068      * content in this view is visible.
   4069      *
   4070      * @return The size in pixels of the vertical faded edge or 0 if vertical
   4071      *         faded edges are not enabled for this view.
   4072      * @attr ref android.R.styleable#View_fadingEdgeLength
   4073      */
   4074     public int getVerticalFadingEdgeLength() {
   4075         if (isVerticalFadingEdgeEnabled()) {
   4076             ScrollabilityCache cache = mScrollCache;
   4077             if (cache != null) {
   4078                 return cache.fadingEdgeLength;
   4079             }
   4080         }
   4081         return 0;
   4082     }
   4083 
   4084     /**
   4085      * Set the size of the faded edge used to indicate that more content in this
   4086      * view is available.  Will not change whether the fading edge is enabled; use
   4087      * {@link #setVerticalFadingEdgeEnabled(boolean)} or
   4088      * {@link #setHorizontalFadingEdgeEnabled(boolean)} to enable the fading edge
   4089      * for the vertical or horizontal fading edges.
   4090      *
   4091      * @param length The size in pixels of the faded edge used to indicate that more
   4092      *        content in this view is visible.
   4093      */
   4094     public void setFadingEdgeLength(int length) {
   4095         initScrollCache();
   4096         mScrollCache.fadingEdgeLength = length;
   4097     }
   4098 
   4099     /**
   4100      * Returns the size of the horizontal faded edges used to indicate that more
   4101      * content in this view is visible.
   4102      *
   4103      * @return The size in pixels of the horizontal faded edge or 0 if horizontal
   4104      *         faded edges are not enabled for this view.
   4105      * @attr ref android.R.styleable#View_fadingEdgeLength
   4106      */
   4107     public int getHorizontalFadingEdgeLength() {
   4108         if (isHorizontalFadingEdgeEnabled()) {
   4109             ScrollabilityCache cache = mScrollCache;
   4110             if (cache != null) {
   4111                 return cache.fadingEdgeLength;
   4112             }
   4113         }
   4114         return 0;
   4115     }
   4116 
   4117     /**
   4118      * Returns the width of the vertical scrollbar.
   4119      *
   4120      * @return The width in pixels of the vertical scrollbar or 0 if there
   4121      *         is no vertical scrollbar.
   4122      */
   4123     public int getVerticalScrollbarWidth() {
   4124         ScrollabilityCache cache = mScrollCache;
   4125         if (cache != null) {
   4126             ScrollBarDrawable scrollBar = cache.scrollBar;
   4127             if (scrollBar != null) {
   4128                 int size = scrollBar.getSize(true);
   4129                 if (size <= 0) {
   4130                     size = cache.scrollBarSize;
   4131                 }
   4132                 return size;
   4133             }
   4134             return 0;
   4135         }
   4136         return 0;
   4137     }
   4138 
   4139     /**
   4140      * Returns the height of the horizontal scrollbar.
   4141      *
   4142      * @return The height in pixels of the horizontal scrollbar or 0 if
   4143      *         there is no horizontal scrollbar.
   4144      */
   4145     protected int getHorizontalScrollbarHeight() {
   4146         ScrollabilityCache cache = mScrollCache;
   4147         if (cache != null) {
   4148             ScrollBarDrawable scrollBar = cache.scrollBar;
   4149             if (scrollBar != null) {
   4150                 int size = scrollBar.getSize(false);
   4151                 if (size <= 0) {
   4152                     size = cache.scrollBarSize;
   4153                 }
   4154                 return size;
   4155             }
   4156             return 0;
   4157         }
   4158         return 0;
   4159     }
   4160 
   4161     /**
   4162      * <p>
   4163      * Initializes the scrollbars from a given set of styled attributes. This
   4164      * method should be called by subclasses that need scrollbars and when an
   4165      * instance of these subclasses is created programmatically rather than
   4166      * being inflated from XML. This method is automatically called when the XML
   4167      * is inflated.
   4168      * </p>
   4169      *
   4170      * @param a the styled attributes set to initialize the scrollbars from
   4171      */
   4172     protected void initializeScrollbars(TypedArray a) {
   4173         initScrollCache();
   4174 
   4175         final ScrollabilityCache scrollabilityCache = mScrollCache;
   4176 
   4177         if (scrollabilityCache.scrollBar == null) {
   4178             scrollabilityCache.scrollBar = new ScrollBarDrawable();
   4179         }
   4180 
   4181         final boolean fadeScrollbars = a.getBoolean(R.styleable.View_fadeScrollbars, true);
   4182 
   4183         if (!fadeScrollbars) {
   4184             scrollabilityCache.state = ScrollabilityCache.ON;
   4185         }
   4186         scrollabilityCache.fadeScrollBars = fadeScrollbars;
   4187 
   4188 
   4189         scrollabilityCache.scrollBarFadeDuration = a.getInt(
   4190                 R.styleable.View_scrollbarFadeDuration, ViewConfiguration
   4191                         .getScrollBarFadeDuration());
   4192         scrollabilityCache.scrollBarDefaultDelayBeforeFade = a.getInt(
   4193                 R.styleable.View_scrollbarDefaultDelayBeforeFade,
   4194                 ViewConfiguration.getScrollDefaultDelay());
   4195 
   4196 
   4197         scrollabilityCache.scrollBarSize = a.getDimensionPixelSize(
   4198                 com.android.internal.R.styleable.View_scrollbarSize,
   4199                 ViewConfiguration.get(mContext).getScaledScrollBarSize());
   4200 
   4201         Drawable track = a.getDrawable(R.styleable.View_scrollbarTrackHorizontal);
   4202         scrollabilityCache.scrollBar.setHorizontalTrackDrawable(track);
   4203 
   4204         Drawable thumb = a.getDrawable(R.styleable.View_scrollbarThumbHorizontal);
   4205         if (thumb != null) {
   4206             scrollabilityCache.scrollBar.setHorizontalThumbDrawable(thumb);
   4207         }
   4208 
   4209         boolean alwaysDraw = a.getBoolean(R.styleable.View_scrollbarAlwaysDrawHorizontalTrack,
   4210                 false);
   4211         if (alwaysDraw) {
   4212             scrollabilityCache.scrollBar.setAlwaysDrawHorizontalTrack(true);
   4213         }
   4214 
   4215         track = a.getDrawable(R.styleable.View_scrollbarTrackVertical);
   4216         scrollabilityCache.scrollBar.setVerticalTrackDrawable(track);
   4217 
   4218         thumb = a.getDrawable(R.styleable.View_scrollbarThumbVertical);
   4219         if (thumb != null) {
   4220             scrollabilityCache.scrollBar.setVerticalThumbDrawable(thumb);
   4221         }
   4222 
   4223         alwaysDraw = a.getBoolean(R.styleable.View_scrollbarAlwaysDrawVerticalTrack,
   4224                 false);
   4225         if (alwaysDraw) {
   4226             scrollabilityCache.scrollBar.setAlwaysDrawVerticalTrack(true);
   4227         }
   4228 
   4229         // Apply layout direction to the new Drawables if needed
   4230         final int layoutDirection = getLayoutDirection();
   4231         if (track != null) {
   4232             track.setLayoutDirection(layoutDirection);
   4233         }
   4234         if (thumb != null) {
   4235             thumb.setLayoutDirection(layoutDirection);
   4236         }
   4237 
   4238         // Re-apply user/background padding so that scrollbar(s) get added
   4239         resolvePadding();
   4240     }
   4241 
   4242     /**
   4243      * <p>
   4244      * Initalizes the scrollability cache if necessary.
   4245      * </p>
   4246      */
   4247     private void initScrollCache() {
   4248         if (mScrollCache == null) {
   4249             mScrollCache = new ScrollabilityCache(ViewConfiguration.get(mContext), this);
   4250         }
   4251     }
   4252 
   4253     private ScrollabilityCache getScrollCache() {
   4254         initScrollCache();
   4255         return mScrollCache;
   4256     }
   4257 
   4258     /**
   4259      * Set the position of the vertical scroll bar. Should be one of
   4260      * {@link #SCROLLBAR_POSITION_DEFAULT}, {@link #SCROLLBAR_POSITION_LEFT} or
   4261      * {@link #SCROLLBAR_POSITION_RIGHT}.
   4262      *
   4263      * @param position Where the vertical scroll bar should be positioned.
   4264      */
   4265     public void setVerticalScrollbarPosition(int position) {
   4266         if (mVerticalScrollbarPosition != position) {
   4267             mVerticalScrollbarPosition = position;
   4268             computeOpaqueFlags();
   4269             resolvePadding();
   4270         }
   4271     }
   4272 
   4273     /**
   4274      * @return The position where the vertical scroll bar will show, if applicable.
   4275      * @see #setVerticalScrollbarPosition(int)
   4276      */
   4277     public int getVerticalScrollbarPosition() {
   4278         return mVerticalScrollbarPosition;
   4279     }
   4280 
   4281     ListenerInfo getListenerInfo() {
   4282         if (mListenerInfo != null) {
   4283             return mListenerInfo;
   4284         }
   4285         mListenerInfo = new ListenerInfo();
   4286         return mListenerInfo;
   4287     }
   4288 
   4289     /**
   4290      * Register a callback to be invoked when focus of this view changed.
   4291      *
   4292      * @param l The callback that will run.
   4293      */
   4294     public void setOnFocusChangeListener(OnFocusChangeListener l) {
   4295         getListenerInfo().mOnFocusChangeListener = l;
   4296     }
   4297 
   4298     /**
   4299      * Add a listener that will be called when the bounds of the view change due to
   4300      * layout processing.
   4301      *
   4302      * @param listener The listener that will be called when layout bounds change.
   4303      */
   4304     public void addOnLayoutChangeListener(OnLayoutChangeListener listener) {
   4305         ListenerInfo li = getListenerInfo();
   4306         if (li.mOnLayoutChangeListeners == null) {
   4307             li.mOnLayoutChangeListeners = new ArrayList<OnLayoutChangeListener>();
   4308         }
   4309         if (!li.mOnLayoutChangeListeners.contains(listener)) {
   4310             li.mOnLayoutChangeListeners.add(listener);
   4311         }
   4312     }
   4313 
   4314     /**
   4315      * Remove a listener for layout changes.
   4316      *
   4317      * @param listener The listener for layout bounds change.
   4318      */
   4319     public void removeOnLayoutChangeListener(OnLayoutChangeListener listener) {
   4320         ListenerInfo li = mListenerInfo;
   4321         if (li == null || li.mOnLayoutChangeListeners == null) {
   4322             return;
   4323         }
   4324         li.mOnLayoutChangeListeners.remove(listener);
   4325     }
   4326 
   4327     /**
   4328      * Add a listener for attach state changes.
   4329      *
   4330      * This listener will be called whenever this view is attached or detached
   4331      * from a window. Remove the listener using
   4332      * {@link #removeOnAttachStateChangeListener(OnAttachStateChangeListener)}.
   4333      *
   4334      * @param listener Listener to attach
   4335      * @see #removeOnAttachStateChangeListener(OnAttachStateChangeListener)
   4336      */
   4337     public void addOnAttachStateChangeListener(OnAttachStateChangeListener listener) {
   4338         ListenerInfo li = getListenerInfo();
   4339         if (li.mOnAttachStateChangeListeners == null) {
   4340             li.mOnAttachStateChangeListeners
   4341                     = new CopyOnWriteArrayList<OnAttachStateChangeListener>();
   4342         }
   4343         li.mOnAttachStateChangeListeners.add(listener);
   4344     }
   4345 
   4346     /**
   4347      * Remove a listener for attach state changes. The listener will receive no further
   4348      * notification of window attach/detach events.
   4349      *
   4350      * @param listener Listener to remove
   4351      * @see #addOnAttachStateChangeListener(OnAttachStateChangeListener)
   4352      */
   4353     public void removeOnAttachStateChangeListener(OnAttachStateChangeListener listener) {
   4354         ListenerInfo li = mListenerInfo;
   4355         if (li == null || li.mOnAttachStateChangeListeners == null) {
   4356             return;
   4357         }
   4358         li.mOnAttachStateChangeListeners.remove(listener);
   4359     }
   4360 
   4361     /**
   4362      * Returns the focus-change callback registered for this view.
   4363      *
   4364      * @return The callback, or null if one is not registered.
   4365      */
   4366     public OnFocusChangeListener getOnFocusChangeListener() {
   4367         ListenerInfo li = mListenerInfo;
   4368         return li != null ? li.mOnFocusChangeListener : null;
   4369     }
   4370 
   4371     /**
   4372      * Register a callback to be invoked when this view is clicked. If this view is not
   4373      * clickable, it becomes clickable.
   4374      *
   4375      * @param l The callback that will run
   4376      *
   4377      * @see #setClickable(boolean)
   4378      */
   4379     public void setOnClickListener(OnClickListener l) {
   4380         if (!isClickable()) {
   4381             setClickable(true);
   4382         }
   4383         getListenerInfo().mOnClickListener = l;
   4384     }
   4385 
   4386     /**
   4387      * Return whether this view has an attached OnClickListener.  Returns
   4388      * true if there is a listener, false if there is none.
   4389      */
   4390     public boolean hasOnClickListeners() {
   4391         ListenerInfo li = mListenerInfo;
   4392         return (li != null && li.mOnClickListener != null);
   4393     }
   4394 
   4395     /**
   4396      * Register a callback to be invoked when this view is clicked and held. If this view is not
   4397      * long clickable, it becomes long clickable.
   4398      *
   4399      * @param l The callback that will run
   4400      *
   4401      * @see #setLongClickable(boolean)
   4402      */
   4403     public void setOnLongClickListener(OnLongClickListener l) {
   4404         if (!isLongClickable()) {
   4405             setLongClickable(true);
   4406         }
   4407         getListenerInfo().mOnLongClickListener = l;
   4408     }
   4409 
   4410     /**
   4411      * Register a callback to be invoked when the context menu for this view is
   4412      * being built. If this view is not long clickable, it becomes long clickable.
   4413      *
   4414      * @param l The callback that will run
   4415      *
   4416      */
   4417     public void setOnCreateContextMenuListener(OnCreateContextMenuListener l) {
   4418         if (!isLongClickable()) {
   4419             setLongClickable(true);
   4420         }
   4421         getListenerInfo().mOnCreateContextMenuListener = l;
   4422     }
   4423 
   4424     /**
   4425      * Call this view's OnClickListener, if it is defined.  Performs all normal
   4426      * actions associated with clicking: reporting accessibility event, playing
   4427      * a sound, etc.
   4428      *
   4429      * @return True there was an assigned OnClickListener that was called, false
   4430      *         otherwise is returned.
   4431      */
   4432     public boolean performClick() {
   4433         sendAccessibilityEvent(AccessibilityEvent.TYPE_VIEW_CLICKED);
   4434 
   4435         ListenerInfo li = mListenerInfo;
   4436         if (li != null && li.mOnClickListener != null) {
   4437             playSoundEffect(SoundEffectConstants.CLICK);
   4438             li.mOnClickListener.onClick(this);
   4439             return true;
   4440         }
   4441 
   4442         return false;
   4443     }
   4444 
   4445     /**
   4446      * Directly call any attached OnClickListener.  Unlike {@link #performClick()},
   4447      * this only calls the listener, and does not do any associated clicking
   4448      * actions like reporting an accessibility event.
   4449      *
   4450      * @return True there was an assigned OnClickListener that was called, false
   4451      *         otherwise is returned.
   4452      */
   4453     public boolean callOnClick() {
   4454         ListenerInfo li = mListenerInfo;
   4455         if (li != null && li.mOnClickListener != null) {
   4456             li.mOnClickListener.onClick(this);
   4457             return true;
   4458         }
   4459         return false;
   4460     }
   4461 
   4462     /**
   4463      * Call this view's OnLongClickListener, if it is defined. Invokes the context menu if the
   4464      * OnLongClickListener did not consume the event.
   4465      *
   4466      * @return True if one of the above receivers consumed the event, false otherwise.
   4467      */
   4468     public boolean performLongClick() {
   4469         sendAccessibilityEvent(AccessibilityEvent.TYPE_VIEW_LONG_CLICKED);
   4470 
   4471         boolean handled = false;
   4472         ListenerInfo li = mListenerInfo;
   4473         if (li != null && li.mOnLongClickListener != null) {
   4474             handled = li.mOnLongClickListener.onLongClick(View.this);
   4475         }
   4476         if (!handled) {
   4477             handled = showContextMenu();
   4478         }
   4479         if (handled) {
   4480             performHapticFeedback(HapticFeedbackConstants.LONG_PRESS);
   4481         }
   4482         return handled;
   4483     }
   4484 
   4485     /**
   4486      * Performs button-related actions during a touch down event.
   4487      *
   4488      * @param event The event.
   4489      * @return True if the down was consumed.
   4490      *
   4491      * @hide
   4492      */
   4493     protected boolean performButtonActionOnTouchDown(MotionEvent event) {
   4494         if ((event.getButtonState() & MotionEvent.BUTTON_SECONDARY) != 0) {
   4495             if (showContextMenu(event.getX(), event.getY(), event.getMetaState())) {
   4496                 return true;
   4497             }
   4498         }
   4499         return false;
   4500     }
   4501 
   4502     /**
   4503      * Bring up the context menu for this view.
   4504      *
   4505      * @return Whether a context menu was displayed.
   4506      */
   4507     public boolean showContextMenu() {
   4508         return getParent().showContextMenuForChild(this);
   4509     }
   4510 
   4511     /**
   4512      * Bring up the context menu for this view, referring to the item under the specified point.
   4513      *
   4514      * @param x The referenced x coordinate.
   4515      * @param y The referenced y coordinate.
   4516      * @param metaState The keyboard modifiers that were pressed.
   4517      * @return Whether a context menu was displayed.
   4518      *
   4519      * @hide
   4520      */
   4521     public boolean showContextMenu(float x, float y, int metaState) {
   4522         return showContextMenu();
   4523     }
   4524 
   4525     /**
   4526      * Start an action mode.
   4527      *
   4528      * @param callback Callback that will control the lifecycle of the action mode
   4529      * @return The new action mode if it is started, null otherwise
   4530      *
   4531      * @see ActionMode
   4532      */
   4533     public ActionMode startActionMode(ActionMode.Callback callback) {
   4534         ViewParent parent = getParent();
   4535         if (parent == null) return null;
   4536         return parent.startActionModeForChild(this, callback);
   4537     }
   4538 
   4539     /**
   4540      * Register a callback to be invoked when a hardware key is pressed in this view.
   4541      * Key presses in software input methods will generally not trigger the methods of
   4542      * this listener.
   4543      * @param l the key listener to attach to this view
   4544      */
   4545     public void setOnKeyListener(OnKeyListener l) {
   4546         getListenerInfo().mOnKeyListener = l;
   4547     }
   4548 
   4549     /**
   4550      * Register a callback to be invoked when a touch event is sent to this view.
   4551      * @param l the touch listener to attach to this view
   4552      */
   4553     public void setOnTouchListener(OnTouchListener l) {
   4554         getListenerInfo().mOnTouchListener = l;
   4555     }
   4556 
   4557     /**
   4558      * Register a callback to be invoked when a generic motion event is sent to this view.
   4559      * @param l the generic motion listener to attach to this view
   4560      */
   4561     public void setOnGenericMotionListener(OnGenericMotionListener l) {
   4562         getListenerInfo().mOnGenericMotionListener = l;
   4563     }
   4564 
   4565     /**
   4566      * Register a callback to be invoked when a hover event is sent to this view.
   4567      * @param l the hover listener to attach to this view
   4568      */
   4569     public void setOnHoverListener(OnHoverListener l) {
   4570         getListenerInfo().mOnHoverListener = l;
   4571     }
   4572 
   4573     /**
   4574      * Register a drag event listener callback object for this View. The parameter is
   4575      * an implementation of {@link android.view.View.OnDragListener}. To send a drag event to a
   4576      * View, the system calls the
   4577      * {@link android.view.View.OnDragListener#onDrag(View,DragEvent)} method.
   4578      * @param l An implementation of {@link android.view.View.OnDragListener}.
   4579      */
   4580     public void setOnDragListener(OnDragListener l) {
   4581         getListenerInfo().mOnDragListener = l;
   4582     }
   4583 
   4584     /**
   4585      * Give this view focus. This will cause
   4586      * {@link #onFocusChanged(boolean, int, android.graphics.Rect)} to be called.
   4587      *
   4588      * Note: this does not check whether this {@link View} should get focus, it just
   4589      * gives it focus no matter what.  It should only be called internally by framework
   4590      * code that knows what it is doing, namely {@link #requestFocus(int, Rect)}.
   4591      *
   4592      * @param direction values are {@link View#FOCUS_UP}, {@link View#FOCUS_DOWN},
   4593      *        {@link View#FOCUS_LEFT} or {@link View#FOCUS_RIGHT}. This is the direction which
   4594      *        focus moved when requestFocus() is called. It may not always
   4595      *        apply, in which case use the default View.FOCUS_DOWN.
   4596      * @param previouslyFocusedRect The rectangle of the view that had focus
   4597      *        prior in this View's coordinate system.
   4598      */
   4599     void handleFocusGainInternal(int direction, Rect previouslyFocusedRect) {
   4600         if (DBG) {
   4601             System.out.println(this + " requestFocus()");
   4602         }
   4603 
   4604         if ((mPrivateFlags & PFLAG_FOCUSED) == 0) {
   4605             mPrivateFlags |= PFLAG_FOCUSED;
   4606 
   4607             View oldFocus = (mAttachInfo != null) ? getRootView().findFocus() : null;
   4608 
   4609             if (mParent != null) {
   4610                 mParent.requestChildFocus(this, this);
   4611             }
   4612 
   4613             if (mAttachInfo != null) {
   4614                 mAttachInfo.mTreeObserver.dispatchOnGlobalFocusChange(oldFocus, this);
   4615             }
   4616 
   4617             onFocusChanged(true, direction, previouslyFocusedRect);
   4618             refreshDrawableState();
   4619         }
   4620     }
   4621 
   4622     /**
   4623      * Request that a rectangle of this view be visible on the screen,
   4624      * scrolling if necessary just enough.
   4625      *
   4626      * <p>A View should call this if it maintains some notion of which part
   4627      * of its content is interesting.  For example, a text editing view
   4628      * should call this when its cursor moves.
   4629      *
   4630      * @param rectangle The rectangle.
   4631      * @return Whether any parent scrolled.
   4632      */
   4633     public boolean requestRectangleOnScreen(Rect rectangle) {
   4634         return requestRectangleOnScreen(rectangle, false);
   4635     }
   4636 
   4637     /**
   4638      * Request that a rectangle of this view be visible on the screen,
   4639      * scrolling if necessary just enough.
   4640      *
   4641      * <p>A View should call this if it maintains some notion of which part
   4642      * of its content is interesting.  For example, a text editing view
   4643      * should call this when its cursor moves.
   4644      *
   4645      * <p>When <code>immediate</code> is set to true, scrolling will not be
   4646      * animated.
   4647      *
   4648      * @param rectangle The rectangle.
   4649      * @param immediate True to forbid animated scrolling, false otherwise
   4650      * @return Whether any parent scrolled.
   4651      */
   4652     public boolean requestRectangleOnScreen(Rect rectangle, boolean immediate) {
   4653         if (mParent == null) {
   4654             return false;
   4655         }
   4656 
   4657         View child = this;
   4658 
   4659         RectF position = (mAttachInfo != null) ? mAttachInfo.mTmpTransformRect : new RectF();
   4660         position.set(rectangle);
   4661 
   4662         ViewParent parent = mParent;
   4663         boolean scrolled = false;
   4664         while (parent != null) {
   4665             rectangle.set((int) position.left, (int) position.top,
   4666                     (int) position.right, (int) position.bottom);
   4667 
   4668             scrolled |= parent.requestChildRectangleOnScreen(child,
   4669                     rectangle, immediate);
   4670 
   4671             if (!child.hasIdentityMatrix()) {
   4672                 child.getMatrix().mapRect(position);
   4673             }
   4674 
   4675             position.offset(child.mLeft, child.mTop);
   4676 
   4677             if (!(parent instanceof View)) {
   4678                 break;
   4679             }
   4680 
   4681             View parentView = (View) parent;
   4682 
   4683             position.offset(-parentView.getScrollX(), -parentView.getScrollY());
   4684 
   4685             child = parentView;
   4686             parent = child.getParent();
   4687         }
   4688 
   4689         return scrolled;
   4690     }
   4691 
   4692     /**
   4693      * Called when this view wants to give up focus. If focus is cleared
   4694      * {@link #onFocusChanged(boolean, int, android.graphics.Rect)} is called.
   4695      * <p>
   4696      * <strong>Note:</strong> When a View clears focus the framework is trying
   4697      * to give focus to the first focusable View from the top. Hence, if this
   4698      * View is the first from the top that can take focus, then all callbacks
   4699      * related to clearing focus will be invoked after wich the framework will
   4700      * give focus to this view.
   4701      * </p>
   4702      */
   4703     public void clearFocus() {
   4704         if (DBG) {
   4705             System.out.println(this + " clearFocus()");
   4706         }
   4707 
   4708         clearFocusInternal(true, true);
   4709     }
   4710 
   4711     /**
   4712      * Clears focus from the view, optionally propagating the change up through
   4713      * the parent hierarchy and requesting that the root view place new focus.
   4714      *
   4715      * @param propagate whether to propagate the change up through the parent
   4716      *            hierarchy
   4717      * @param refocus when propagate is true, specifies whether to request the
   4718      *            root view place new focus
   4719      */
   4720     void clearFocusInternal(boolean propagate, boolean refocus) {
   4721         if ((mPrivateFlags & PFLAG_FOCUSED) != 0) {
   4722             mPrivateFlags &= ~PFLAG_FOCUSED;
   4723 
   4724             if (propagate && mParent != null) {
   4725                 mParent.clearChildFocus(this);
   4726             }
   4727 
   4728             onFocusChanged(false, 0, null);
   4729 
   4730             refreshDrawableState();
   4731 
   4732             if (propagate && (!refocus || !rootViewRequestFocus())) {
   4733                 notifyGlobalFocusCleared(this);
   4734             }
   4735         }
   4736     }
   4737 
   4738     void notifyGlobalFocusCleared(View oldFocus) {
   4739         if (oldFocus != null && mAttachInfo != null) {
   4740             mAttachInfo.mTreeObserver.dispatchOnGlobalFocusChange(oldFocus, null);
   4741         }
   4742     }
   4743 
   4744     boolean rootViewRequestFocus() {
   4745         final View root = getRootView();
   4746         return root != null && root.requestFocus();
   4747     }
   4748 
   4749     /**
   4750      * Called internally by the view system when a new view is getting focus.
   4751      * This is what clears the old focus.
   4752      * <p>
   4753      * <b>NOTE:</b> The parent view's focused child must be updated manually
   4754      * after calling this method. Otherwise, the view hierarchy may be left in
   4755      * an inconstent state.
   4756      */
   4757     void unFocus() {
   4758         if (DBG) {
   4759             System.out.println(this + " unFocus()");
   4760         }
   4761 
   4762         clearFocusInternal(false, false);
   4763     }
   4764 
   4765     /**
   4766      * Returns true if this view has focus iteself, or is the ancestor of the
   4767      * view that has focus.
   4768      *
   4769      * @return True if this view has or contains focus, false otherwise.
   4770      */
   4771     @ViewDebug.ExportedProperty(category = "focus")
   4772     public boolean hasFocus() {
   4773         return (mPrivateFlags & PFLAG_FOCUSED) != 0;
   4774     }
   4775 
   4776     /**
   4777      * Returns true if this view is focusable or if it contains a reachable View
   4778      * for which {@link #hasFocusable()} returns true. A "reachable hasFocusable()"
   4779      * is a View whose parents do not block descendants focus.
   4780      *
   4781      * Only {@link #VISIBLE} views are considered focusable.
   4782      *
   4783      * @return True if the view is focusable or if the view contains a focusable
   4784      *         View, false otherwise.
   4785      *
   4786      * @see ViewGroup#FOCUS_BLOCK_DESCENDANTS
   4787      */
   4788     public boolean hasFocusable() {
   4789         return (mViewFlags & VISIBILITY_MASK) == VISIBLE && isFocusable();
   4790     }
   4791 
   4792     /**
   4793      * Called by the view system when the focus state of this view changes.
   4794      * When the focus change event is caused by directional navigation, direction
   4795      * and previouslyFocusedRect provide insight into where the focus is coming from.
   4796      * When overriding, be sure to call up through to the super class so that
   4797      * the standard focus handling will occur.
   4798      *
   4799      * @param gainFocus True if the View has focus; false otherwise.
   4800      * @param direction The direction focus has moved when requestFocus()
   4801      *                  is called to give this view focus. Values are
   4802      *                  {@link #FOCUS_UP}, {@link #FOCUS_DOWN}, {@link #FOCUS_LEFT},
   4803      *                  {@link #FOCUS_RIGHT}, {@link #FOCUS_FORWARD}, or {@link #FOCUS_BACKWARD}.
   4804      *                  It may not always apply, in which case use the default.
   4805      * @param previouslyFocusedRect The rectangle, in this view's coordinate
   4806      *        system, of the previously focused view.  If applicable, this will be
   4807      *        passed in as finer grained information about where the focus is coming
   4808      *        from (in addition to direction).  Will be <code>null</code> otherwise.
   4809      */
   4810     protected void onFocusChanged(boolean gainFocus, int direction, Rect previouslyFocusedRect) {
   4811         if (gainFocus) {
   4812             sendAccessibilityEvent(AccessibilityEvent.TYPE_VIEW_FOCUSED);
   4813         } else {
   4814             notifyViewAccessibilityStateChangedIfNeeded(
   4815                     AccessibilityEvent.CONTENT_CHANGE_TYPE_UNDEFINED);
   4816         }
   4817 
   4818         InputMethodManager imm = InputMethodManager.peekInstance();
   4819         if (!gainFocus) {
   4820             if (isPressed()) {
   4821                 setPressed(false);
   4822             }
   4823             if (imm != null && mAttachInfo != null
   4824                     && mAttachInfo.mHasWindowFocus) {
   4825                 imm.focusOut(this);
   4826             }
   4827             onFocusLost();
   4828         } else if (imm != null && mAttachInfo != null
   4829                 && mAttachInfo.mHasWindowFocus) {
   4830             imm.focusIn(this);
   4831         }
   4832 
   4833         invalidate(true);
   4834         ListenerInfo li = mListenerInfo;
   4835         if (li != null && li.mOnFocusChangeListener != null) {
   4836             li.mOnFocusChangeListener.onFocusChange(this, gainFocus);
   4837         }
   4838 
   4839         if (mAttachInfo != null) {
   4840             mAttachInfo.mKeyDispatchState.reset(this);
   4841         }
   4842     }
   4843 
   4844     /**
   4845      * Sends an accessibility event of the given type. If accessibility is
   4846      * not enabled this method has no effect. The default implementation calls
   4847      * {@link #onInitializeAccessibilityEvent(AccessibilityEvent)} first
   4848      * to populate information about the event source (this View), then calls
   4849      * {@link #dispatchPopulateAccessibilityEvent(AccessibilityEvent)} to
   4850      * populate the text content of the event source including its descendants,
   4851      * and last calls
   4852      * {@link ViewParent#requestSendAccessibilityEvent(View, AccessibilityEvent)}
   4853      * on its parent to resuest sending of the event to interested parties.
   4854      * <p>
   4855      * If an {@link AccessibilityDelegate} has been specified via calling
   4856      * {@link #setAccessibilityDelegate(AccessibilityDelegate)} its
   4857      * {@link AccessibilityDelegate#sendAccessibilityEvent(View, int)} is
   4858      * responsible for handling this call.
   4859      * </p>
   4860      *
   4861      * @param eventType The type of the event to send, as defined by several types from
   4862      * {@link android.view.accessibility.AccessibilityEvent}, such as
   4863      * {@link android.view.accessibility.AccessibilityEvent#TYPE_VIEW_CLICKED} or
   4864      * {@link android.view.accessibility.AccessibilityEvent#TYPE_VIEW_HOVER_ENTER}.
   4865      *
   4866      * @see #onInitializeAccessibilityEvent(AccessibilityEvent)
   4867      * @see #dispatchPopulateAccessibilityEvent(AccessibilityEvent)
   4868      * @see ViewParent#requestSendAccessibilityEvent(View, AccessibilityEvent)
   4869      * @see AccessibilityDelegate
   4870      */
   4871     public void sendAccessibilityEvent(int eventType) {
   4872         // Excluded views do not send accessibility events.
   4873         if (!includeForAccessibility()) {
   4874             return;
   4875         }
   4876         if (mAccessibilityDelegate != null) {
   4877             mAccessibilityDelegate.sendAccessibilityEvent(this, eventType);
   4878         } else {
   4879             sendAccessibilityEventInternal(eventType);
   4880         }
   4881     }
   4882 
   4883     /**
   4884      * Convenience method for sending a {@link AccessibilityEvent#TYPE_ANNOUNCEMENT}
   4885      * {@link AccessibilityEvent} to make an announcement which is related to some
   4886      * sort of a context change for which none of the events representing UI transitions
   4887      * is a good fit. For example, announcing a new page in a book. If accessibility
   4888      * is not enabled this method does nothing.
   4889      *
   4890      * @param text The announcement text.
   4891      */
   4892     public void announceForAccessibility(CharSequence text) {
   4893         if (AccessibilityManager.getInstance(mContext).isEnabled() && mParent != null) {
   4894             AccessibilityEvent event = AccessibilityEvent.obtain(
   4895                     AccessibilityEvent.TYPE_ANNOUNCEMENT);
   4896             onInitializeAccessibilityEvent(event);
   4897             event.getText().add(text);
   4898             event.setContentDescription(null);
   4899             mParent.requestSendAccessibilityEvent(this, event);
   4900         }
   4901     }
   4902 
   4903     /**
   4904      * @see #sendAccessibilityEvent(int)
   4905      *
   4906      * Note: Called from the default {@link AccessibilityDelegate}.
   4907      */
   4908     void sendAccessibilityEventInternal(int eventType) {
   4909         if (AccessibilityManager.getInstance(mContext).isEnabled()) {
   4910             sendAccessibilityEventUnchecked(AccessibilityEvent.obtain(eventType));
   4911         }
   4912     }
   4913 
   4914     /**
   4915      * This method behaves exactly as {@link #sendAccessibilityEvent(int)} but
   4916      * takes as an argument an empty {@link AccessibilityEvent} and does not
   4917      * perform a check whether accessibility is enabled.
   4918      * <p>
   4919      * If an {@link AccessibilityDelegate} has been specified via calling
   4920      * {@link #setAccessibilityDelegate(AccessibilityDelegate)} its
   4921      * {@link AccessibilityDelegate#sendAccessibilityEventUnchecked(View, AccessibilityEvent)}
   4922      * is responsible for handling this call.
   4923      * </p>
   4924      *
   4925      * @param event The event to send.
   4926      *
   4927      * @see #sendAccessibilityEvent(int)
   4928      */
   4929     public void sendAccessibilityEventUnchecked(AccessibilityEvent event) {
   4930         if (mAccessibilityDelegate != null) {
   4931             mAccessibilityDelegate.sendAccessibilityEventUnchecked(this, event);
   4932         } else {
   4933             sendAccessibilityEventUncheckedInternal(event);
   4934         }
   4935     }
   4936 
   4937     /**
   4938      * @see #sendAccessibilityEventUnchecked(AccessibilityEvent)
   4939      *
   4940      * Note: Called from the default {@link AccessibilityDelegate}.
   4941      */
   4942     void sendAccessibilityEventUncheckedInternal(AccessibilityEvent event) {
   4943         if (!isShown()) {
   4944             return;
   4945         }
   4946         onInitializeAccessibilityEvent(event);
   4947         // Only a subset of accessibility events populates text content.
   4948         if ((event.getEventType() & POPULATING_ACCESSIBILITY_EVENT_TYPES) != 0) {
   4949             dispatchPopulateAccessibilityEvent(event);
   4950         }
   4951         // In the beginning we called #isShown(), so we know that getParent() is not null.
   4952         getParent().requestSendAccessibilityEvent(this, event);
   4953     }
   4954 
   4955     /**
   4956      * Dispatches an {@link AccessibilityEvent} to the {@link View} first and then
   4957      * to its children for adding their text content to the event. Note that the
   4958      * event text is populated in a separate dispatch path since we add to the
   4959      * event not only the text of the source but also the text of all its descendants.
   4960      * A typical implementation will call
   4961      * {@link #onPopulateAccessibilityEvent(AccessibilityEvent)} on the this view
   4962      * and then call the {@link #dispatchPopulateAccessibilityEvent(AccessibilityEvent)}
   4963      * on each child. Override this method if custom population of the event text
   4964      * content is required.
   4965      * <p>
   4966      * If an {@link AccessibilityDelegate} has been specified via calling
   4967      * {@link #setAccessibilityDelegate(AccessibilityDelegate)} its
   4968      * {@link AccessibilityDelegate#dispatchPopulateAccessibilityEvent(View, AccessibilityEvent)}
   4969      * is responsible for handling this call.
   4970      * </p>
   4971      * <p>
   4972      * <em>Note:</em> Accessibility events of certain types are not dispatched for
   4973      * populating the event text via this method. For details refer to {@link AccessibilityEvent}.
   4974      * </p>
   4975      *
   4976      * @param event The event.
   4977      *
   4978      * @return True if the event population was completed.
   4979      */
   4980     public boolean dispatchPopulateAccessibilityEvent(AccessibilityEvent event) {
   4981         if (mAccessibilityDelegate != null) {
   4982             return mAccessibilityDelegate.dispatchPopulateAccessibilityEvent(this, event);
   4983         } else {
   4984             return dispatchPopulateAccessibilityEventInternal(event);
   4985         }
   4986     }
   4987 
   4988     /**
   4989      * @see #dispatchPopulateAccessibilityEvent(AccessibilityEvent)
   4990      *
   4991      * Note: Called from the default {@link AccessibilityDelegate}.
   4992      */
   4993     boolean dispatchPopulateAccessibilityEventInternal(AccessibilityEvent event) {
   4994         onPopulateAccessibilityEvent(event);
   4995         return false;
   4996     }
   4997 
   4998     /**
   4999      * Called from {@link #dispatchPopulateAccessibilityEvent(AccessibilityEvent)}
   5000      * giving a chance to this View to populate the accessibility event with its
   5001      * text content. While this method is free to modify event
   5002      * attributes other than text content, doing so should normally be performed in
   5003      * {@link #onInitializeAccessibilityEvent(AccessibilityEvent)}.
   5004      * <p>
   5005      * Example: Adding formatted date string to an accessibility event in addition
   5006      *          to the text added by the super implementation:
   5007      * <pre> public void onPopulateAccessibilityEvent(AccessibilityEvent event) {
   5008      *     super.onPopulateAccessibilityEvent(event);
   5009      *     final int flags = DateUtils.FORMAT_SHOW_DATE | DateUtils.FORMAT_SHOW_WEEKDAY;
   5010      *     String selectedDateUtterance = DateUtils.formatDateTime(mContext,
   5011      *         mCurrentDate.getTimeInMillis(), flags);
   5012      *     event.getText().add(selectedDateUtterance);
   5013      * }</pre>
   5014      * <p>
   5015      * If an {@link AccessibilityDelegate} has been specified via calling
   5016      * {@link #setAccessibilityDelegate(AccessibilityDelegate)} its
   5017      * {@link AccessibilityDelegate#onPopulateAccessibilityEvent(View, AccessibilityEvent)}
   5018      * is responsible for handling this call.
   5019      * </p>
   5020      * <p class="note"><strong>Note:</strong> Always call the super implementation before adding
   5021      * information to the event, in case the default implementation has basic information to add.
   5022      * </p>
   5023      *
   5024      * @param event The accessibility event which to populate.
   5025      *
   5026      * @see #sendAccessibilityEvent(int)
   5027      * @see #dispatchPopulateAccessibilityEvent(AccessibilityEvent)
   5028      */
   5029     public void onPopulateAccessibilityEvent(AccessibilityEvent event) {
   5030         if (mAccessibilityDelegate != null) {
   5031             mAccessibilityDelegate.onPopulateAccessibilityEvent(this, event);
   5032         } else {
   5033             onPopulateAccessibilityEventInternal(event);
   5034         }
   5035     }
   5036 
   5037     /**
   5038      * @see #onPopulateAccessibilityEvent(AccessibilityEvent)
   5039      *
   5040      * Note: Called from the default {@link AccessibilityDelegate}.
   5041      */
   5042     void onPopulateAccessibilityEventInternal(AccessibilityEvent event) {
   5043     }
   5044 
   5045     /**
   5046      * Initializes an {@link AccessibilityEvent} with information about
   5047      * this View which is the event source. In other words, the source of
   5048      * an accessibility event is the view whose state change triggered firing
   5049      * the event.
   5050      * <p>
   5051      * Example: Setting the password property of an event in addition
   5052      *          to properties set by the super implementation:
   5053      * <pre> public void onInitializeAccessibilityEvent(AccessibilityEvent event) {
   5054      *     super.onInitializeAccessibilityEvent(event);
   5055      *     event.setPassword(true);
   5056      * }</pre>
   5057      * <p>
   5058      * If an {@link AccessibilityDelegate} has been specified via calling
   5059      * {@link #setAccessibilityDelegate(AccessibilityDelegate)} its
   5060      * {@link AccessibilityDelegate#onInitializeAccessibilityEvent(View, AccessibilityEvent)}
   5061      * is responsible for handling this call.
   5062      * </p>
   5063      * <p class="note"><strong>Note:</strong> Always call the super implementation before adding
   5064      * information to the event, in case the default implementation has basic information to add.
   5065      * </p>
   5066      * @param event The event to initialize.
   5067      *
   5068      * @see #sendAccessibilityEvent(int)
   5069      * @see #dispatchPopulateAccessibilityEvent(AccessibilityEvent)
   5070      */
   5071     public void onInitializeAccessibilityEvent(AccessibilityEvent event) {
   5072         if (mAccessibilityDelegate != null) {
   5073             mAccessibilityDelegate.onInitializeAccessibilityEvent(this, event);
   5074         } else {
   5075             onInitializeAccessibilityEventInternal(event);
   5076         }
   5077     }
   5078 
   5079     /**
   5080      * @see #onInitializeAccessibilityEvent(AccessibilityEvent)
   5081      *
   5082      * Note: Called from the default {@link AccessibilityDelegate}.
   5083      */
   5084     void onInitializeAccessibilityEventInternal(AccessibilityEvent event) {
   5085         event.setSource(this);
   5086         event.setClassName(View.class.getName());
   5087         event.setPackageName(getContext().getPackageName());
   5088         event.setEnabled(isEnabled());
   5089         event.setContentDescription(mContentDescription);
   5090 
   5091         switch (event.getEventType()) {
   5092             case AccessibilityEvent.TYPE_VIEW_FOCUSED: {
   5093                 ArrayList<View> focusablesTempList = (mAttachInfo != null)
   5094                         ? mAttachInfo.mTempArrayList : new ArrayList<View>();
   5095                 getRootView().addFocusables(focusablesTempList, View.FOCUS_FORWARD, FOCUSABLES_ALL);
   5096                 event.setItemCount(focusablesTempList.size());
   5097                 event.setCurrentItemIndex(focusablesTempList.indexOf(this));
   5098                 if (mAttachInfo != null) {
   5099                     focusablesTempList.clear();
   5100                 }
   5101             } break;
   5102             case AccessibilityEvent.TYPE_VIEW_TEXT_SELECTION_CHANGED: {
   5103                 CharSequence text = getIterableTextForAccessibility();
   5104                 if (text != null && text.length() > 0) {
   5105                     event.setFromIndex(getAccessibilitySelectionStart());
   5106                     event.setToIndex(getAccessibilitySelectionEnd());
   5107                     event.setItemCount(text.length());
   5108                 }
   5109             } break;
   5110         }
   5111     }
   5112 
   5113     /**
   5114      * Returns an {@link AccessibilityNodeInfo} representing this view from the
   5115      * point of view of an {@link android.accessibilityservice.AccessibilityService}.
   5116      * This method is responsible for obtaining an accessibility node info from a
   5117      * pool of reusable instances and calling
   5118      * {@link #onInitializeAccessibilityNodeInfo(AccessibilityNodeInfo)} on this view to
   5119      * initialize the former.
   5120      * <p>
   5121      * Note: The client is responsible for recycling the obtained instance by calling
   5122      *       {@link AccessibilityNodeInfo#recycle()} to minimize object creation.
   5123      * </p>
   5124      *
   5125      * @return A populated {@link AccessibilityNodeInfo}.
   5126      *
   5127      * @see AccessibilityNodeInfo
   5128      */
   5129     public AccessibilityNodeInfo createAccessibilityNodeInfo() {
   5130         if (mAccessibilityDelegate != null) {
   5131             return mAccessibilityDelegate.createAccessibilityNodeInfo(this);
   5132         } else {
   5133             return createAccessibilityNodeInfoInternal();
   5134         }
   5135     }
   5136 
   5137     /**
   5138      * @see #createAccessibilityNodeInfo()
   5139      */
   5140     AccessibilityNodeInfo createAccessibilityNodeInfoInternal() {
   5141         AccessibilityNodeProvider provider = getAccessibilityNodeProvider();
   5142         if (provider != null) {
   5143             return provider.createAccessibilityNodeInfo(View.NO_ID);
   5144         } else {
   5145             AccessibilityNodeInfo info = AccessibilityNodeInfo.obtain(this);
   5146             onInitializeAccessibilityNodeInfo(info);
   5147             return info;
   5148         }
   5149     }
   5150 
   5151     /**
   5152      * Initializes an {@link AccessibilityNodeInfo} with information about this view.
   5153      * The base implementation sets:
   5154      * <ul>
   5155      *   <li>{@link AccessibilityNodeInfo#setParent(View)},</li>
   5156      *   <li>{@link AccessibilityNodeInfo#setBoundsInParent(Rect)},</li>
   5157      *   <li>{@link AccessibilityNodeInfo#setBoundsInScreen(Rect)},</li>
   5158      *   <li>{@link AccessibilityNodeInfo#setPackageName(CharSequence)},</li>
   5159      *   <li>{@link AccessibilityNodeInfo#setClassName(CharSequence)},</li>
   5160      *   <li>{@link AccessibilityNodeInfo#setContentDescription(CharSequence)},</li>
   5161      *   <li>{@link AccessibilityNodeInfo#setEnabled(boolean)},</li>
   5162      *   <li>{@link AccessibilityNodeInfo#setClickable(boolean)},</li>
   5163      *   <li>{@link AccessibilityNodeInfo#setFocusable(boolean)},</li>
   5164      *   <li>{@link AccessibilityNodeInfo#setFocused(boolean)},</li>
   5165      *   <li>{@link AccessibilityNodeInfo#setLongClickable(boolean)},</li>
   5166      *   <li>{@link AccessibilityNodeInfo#setSelected(boolean)},</li>
   5167      * </ul>
   5168      * <p>
   5169      * Subclasses should override this method, call the super implementation,
   5170      * and set additional attributes.
   5171      * </p>
   5172      * <p>
   5173      * If an {@link AccessibilityDelegate} has been specified via calling
   5174      * {@link #setAccessibilityDelegate(AccessibilityDelegate)} its
   5175      * {@link AccessibilityDelegate#onInitializeAccessibilityNodeInfo(View, AccessibilityNodeInfo)}
   5176      * is responsible for handling this call.
   5177      * </p>
   5178      *
   5179      * @param info The instance to initialize.
   5180      */
   5181     public void onInitializeAccessibilityNodeInfo(AccessibilityNodeInfo info) {
   5182         if (mAccessibilityDelegate != null) {
   5183             mAccessibilityDelegate.onInitializeAccessibilityNodeInfo(this, info);
   5184         } else {
   5185             onInitializeAccessibilityNodeInfoInternal(info);
   5186         }
   5187     }
   5188 
   5189     /**
   5190      * Gets the location of this view in screen coordintates.
   5191      *
   5192      * @param outRect The output location
   5193      */
   5194     void getBoundsOnScreen(Rect outRect) {
   5195         if (mAttachInfo == null) {
   5196             return;
   5197         }
   5198 
   5199         RectF position = mAttachInfo.mTmpTransformRect;
   5200         position.set(0, 0, mRight - mLeft, mBottom - mTop);
   5201 
   5202         if (!hasIdentityMatrix()) {
   5203             getMatrix().mapRect(position);
   5204         }
   5205 
   5206         position.offset(mLeft, mTop);
   5207 
   5208         ViewParent parent = mParent;
   5209         while (parent instanceof View) {
   5210             View parentView = (View) parent;
   5211 
   5212             position.offset(-parentView.mScrollX, -parentView.mScrollY);
   5213 
   5214             if (!parentView.hasIdentityMatrix()) {
   5215                 parentView.getMatrix().mapRect(position);
   5216             }
   5217 
   5218             position.offset(parentView.mLeft, parentView.mTop);
   5219 
   5220             parent = parentView.mParent;
   5221         }
   5222 
   5223         if (parent instanceof ViewRootImpl) {
   5224             ViewRootImpl viewRootImpl = (ViewRootImpl) parent;
   5225             position.offset(0, -viewRootImpl.mCurScrollY);
   5226         }
   5227 
   5228         position.offset(mAttachInfo.mWindowLeft, mAttachInfo.mWindowTop);
   5229 
   5230         outRect.set((int) (position.left + 0.5f), (int) (position.top + 0.5f),
   5231                 (int) (position.right + 0.5f), (int) (position.bottom + 0.5f));
   5232     }
   5233 
   5234     /**
   5235      * @see #onInitializeAccessibilityNodeInfo(AccessibilityNodeInfo)
   5236      *
   5237      * Note: Called from the default {@link AccessibilityDelegate}.
   5238      */
   5239     void onInitializeAccessibilityNodeInfoInternal(AccessibilityNodeInfo info) {
   5240         Rect bounds = mAttachInfo.mTmpInvalRect;
   5241 
   5242         getDrawingRect(bounds);
   5243         info.setBoundsInParent(bounds);
   5244 
   5245         getBoundsOnScreen(bounds);
   5246         info.setBoundsInScreen(bounds);
   5247 
   5248         ViewParent parent = getParentForAccessibility();
   5249         if (parent instanceof View) {
   5250             info.setParent((View) parent);
   5251         }
   5252 
   5253         if (mID != View.NO_ID) {
   5254             View rootView = getRootView();
   5255             if (rootView == null) {
   5256                 rootView = this;
   5257             }
   5258             View label = rootView.findLabelForView(this, mID);
   5259             if (label != null) {
   5260                 info.setLabeledBy(label);
   5261             }
   5262 
   5263             if ((mAttachInfo.mAccessibilityFetchFlags
   5264                     & AccessibilityNodeInfo.FLAG_REPORT_VIEW_IDS) != 0
   5265                     && Resources.resourceHasPackage(mID)) {
   5266                 try {
   5267                     String viewId = getResources().getResourceName(mID);
   5268                     info.setViewIdResourceName(viewId);
   5269                 } catch (Resources.NotFoundException nfe) {
   5270                     /* ignore */
   5271                 }
   5272             }
   5273         }
   5274 
   5275         if (mLabelForId != View.NO_ID) {
   5276             View rootView = getRootView();
   5277             if (rootView == null) {
   5278                 rootView = this;
   5279             }
   5280             View labeled = rootView.findViewInsideOutShouldExist(this, mLabelForId);
   5281             if (labeled != null) {
   5282                 info.setLabelFor(labeled);
   5283             }
   5284         }
   5285 
   5286         info.setVisibleToUser(isVisibleToUser());
   5287 
   5288         info.setPackageName(mContext.getPackageName());
   5289         info.setClassName(View.class.getName());
   5290         info.setContentDescription(getContentDescription());
   5291 
   5292         info.setEnabled(isEnabled());
   5293         info.setClickable(isClickable());
   5294         info.setFocusable(isFocusable());
   5295         info.setFocused(isFocused());
   5296         info.setAccessibilityFocused(isAccessibilityFocused());
   5297         info.setSelected(isSelected());
   5298         info.setLongClickable(isLongClickable());
   5299         info.setLiveRegion(getAccessibilityLiveRegion());
   5300 
   5301         // TODO: These make sense only if we are in an AdapterView but all
   5302         // views can be selected. Maybe from accessibility perspective
   5303         // we should report as selectable view in an AdapterView.
   5304         info.addAction(AccessibilityNodeInfo.ACTION_SELECT);
   5305         info.addAction(AccessibilityNodeInfo.ACTION_CLEAR_SELECTION);
   5306 
   5307         if (isFocusable()) {
   5308             if (isFocused()) {
   5309                 info.addAction(AccessibilityNodeInfo.ACTION_CLEAR_FOCUS);
   5310             } else {
   5311                 info.addAction(AccessibilityNodeInfo.ACTION_FOCUS);
   5312             }
   5313         }
   5314 
   5315         if (!isAccessibilityFocused()) {
   5316             info.addAction(AccessibilityNodeInfo.ACTION_ACCESSIBILITY_FOCUS);
   5317         } else {
   5318             info.addAction(AccessibilityNodeInfo.ACTION_CLEAR_ACCESSIBILITY_FOCUS);
   5319         }
   5320 
   5321         if (isClickable() && isEnabled()) {
   5322             info.addAction(AccessibilityNodeInfo.ACTION_CLICK);
   5323         }
   5324 
   5325         if (isLongClickable() && isEnabled()) {
   5326             info.addAction(AccessibilityNodeInfo.ACTION_LONG_CLICK);
   5327         }
   5328 
   5329         CharSequence text = getIterableTextForAccessibility();
   5330         if (text != null && text.length() > 0) {
   5331             info.setTextSelection(getAccessibilitySelectionStart(), getAccessibilitySelectionEnd());
   5332 
   5333             info.addAction(AccessibilityNodeInfo.ACTION_SET_SELECTION);
   5334             info.addAction(AccessibilityNodeInfo.ACTION_NEXT_AT_MOVEMENT_GRANULARITY);
   5335             info.addAction(AccessibilityNodeInfo.ACTION_PREVIOUS_AT_MOVEMENT_GRANULARITY);
   5336             info.setMovementGranularities(AccessibilityNodeInfo.MOVEMENT_GRANULARITY_CHARACTER
   5337                     | AccessibilityNodeInfo.MOVEMENT_GRANULARITY_WORD
   5338                     | AccessibilityNodeInfo.MOVEMENT_GRANULARITY_PARAGRAPH);
   5339         }
   5340     }
   5341 
   5342     private View findLabelForView(View view, int labeledId) {
   5343         if (mMatchLabelForPredicate == null) {
   5344             mMatchLabelForPredicate = new MatchLabelForPredicate();
   5345         }
   5346         mMatchLabelForPredicate.mLabeledId = labeledId;
   5347         return findViewByPredicateInsideOut(view, mMatchLabelForPredicate);
   5348     }
   5349 
   5350     /**
   5351      * Computes whether this view is visible to the user. Such a view is
   5352      * attached, visible, all its predecessors are visible, it is not clipped
   5353      * entirely by its predecessors, and has an alpha greater than zero.
   5354      *
   5355      * @return Whether the view is visible on the screen.
   5356      *
   5357      * @hide
   5358      */
   5359     protected boolean isVisibleToUser() {
   5360         return isVisibleToUser(null);
   5361     }
   5362 
   5363     /**
   5364      * Computes whether the given portion of this view is visible to the user.
   5365      * Such a view is attached, visible, all its predecessors are visible,
   5366      * has an alpha greater than zero, and the specified portion is not
   5367      * clipped entirely by its predecessors.
   5368      *
   5369      * @param boundInView the portion of the view to test; coordinates should be relative; may be
   5370      *                    <code>null</code>, and the entire view will be tested in this case.
   5371      *                    When <code>true</code> is returned by the function, the actual visible
   5372      *                    region will be stored in this parameter; that is, if boundInView is fully
   5373      *                    contained within the view, no modification will be made, otherwise regions
   5374      *                    outside of the visible area of the view will be clipped.
   5375      *
   5376      * @return Whether the specified portion of the view is visible on the screen.
   5377      *
   5378      * @hide
   5379      */
   5380     protected boolean isVisibleToUser(Rect boundInView) {
   5381         if (mAttachInfo != null) {
   5382             // Attached to invisible window means this view is not visible.
   5383             if (mAttachInfo.mWindowVisibility != View.VISIBLE) {
   5384                 return false;
   5385             }
   5386             // An invisible predecessor or one with alpha zero means
   5387             // that this view is not visible to the user.
   5388             Object current = this;
   5389             while (current instanceof View) {
   5390                 View view = (View) current;
   5391                 // We have attach info so this view is attached and there is no
   5392                 // need to check whether we reach to ViewRootImpl on the way up.
   5393                 if (view.getAlpha() <= 0 || view.getTransitionAlpha() <= 0 ||
   5394                         view.getVisibility() != VISIBLE) {
   5395                     return false;
   5396                 }
   5397                 current = view.mParent;
   5398             }
   5399             // Check if the view is entirely covered by its predecessors.
   5400             Rect visibleRect = mAttachInfo.mTmpInvalRect;
   5401             Point offset = mAttachInfo.mPoint;
   5402             if (!getGlobalVisibleRect(visibleRect, offset)) {
   5403                 return false;
   5404             }
   5405             // Check if the visible portion intersects the rectangle of interest.
   5406             if (boundInView != null) {
   5407                 visibleRect.offset(-offset.x, -offset.y);
   5408                 return boundInView.intersect(visibleRect);
   5409             }
   5410             return true;
   5411         }
   5412         return false;
   5413     }
   5414 
   5415     /**
   5416      * Returns the delegate for implementing accessibility support via
   5417      * composition. For more details see {@link AccessibilityDelegate}.
   5418      *
   5419      * @return The delegate, or null if none set.
   5420      *
   5421      * @hide
   5422      */
   5423     public AccessibilityDelegate getAccessibilityDelegate() {
   5424         return mAccessibilityDelegate;
   5425     }
   5426 
   5427     /**
   5428      * Sets a delegate for implementing accessibility support via composition as
   5429      * opposed to inheritance. The delegate's primary use is for implementing
   5430      * backwards compatible widgets. For more details see {@link AccessibilityDelegate}.
   5431      *
   5432      * @param delegate The delegate instance.
   5433      *
   5434      * @see AccessibilityDelegate
   5435      */
   5436     public void setAccessibilityDelegate(AccessibilityDelegate delegate) {
   5437         mAccessibilityDelegate = delegate;
   5438     }
   5439 
   5440     /**
   5441      * Gets the provider for managing a virtual view hierarchy rooted at this View
   5442      * and reported to {@link android.accessibilityservice.AccessibilityService}s
   5443      * that explore the window content.
   5444      * <p>
   5445      * If this method returns an instance, this instance is responsible for managing
   5446      * {@link AccessibilityNodeInfo}s describing the virtual sub-tree rooted at this
   5447      * View including the one representing the View itself. Similarly the returned
   5448      * instance is responsible for performing accessibility actions on any virtual
   5449      * view or the root view itself.
   5450      * </p>
   5451      * <p>
   5452      * If an {@link AccessibilityDelegate} has been specified via calling
   5453      * {@link #setAccessibilityDelegate(AccessibilityDelegate)} its
   5454      * {@link AccessibilityDelegate#getAccessibilityNodeProvider(View)}
   5455      * is responsible for handling this call.
   5456      * </p>
   5457      *
   5458      * @return The provider.
   5459      *
   5460      * @see AccessibilityNodeProvider
   5461      */
   5462     public AccessibilityNodeProvider getAccessibilityNodeProvider() {
   5463         if (mAccessibilityDelegate != null) {
   5464             return mAccessibilityDelegate.getAccessibilityNodeProvider(this);
   5465         } else {
   5466             return null;
   5467         }
   5468     }
   5469 
   5470     /**
   5471      * Gets the unique identifier of this view on the screen for accessibility purposes.
   5472      * If this {@link View} is not attached to any window, {@value #NO_ID} is returned.
   5473      *
   5474      * @return The view accessibility id.
   5475      *
   5476      * @hide
   5477      */
   5478     public int getAccessibilityViewId() {
   5479         if (mAccessibilityViewId == NO_ID) {
   5480             mAccessibilityViewId = sNextAccessibilityViewId++;
   5481         }
   5482         return mAccessibilityViewId;
   5483     }
   5484 
   5485     /**
   5486      * Gets the unique identifier of the window in which this View reseides.
   5487      *
   5488      * @return The window accessibility id.
   5489      *
   5490      * @hide
   5491      */
   5492     public int getAccessibilityWindowId() {
   5493         return mAttachInfo != null ? mAttachInfo.mAccessibilityWindowId : NO_ID;
   5494     }
   5495 
   5496     /**
   5497      * Gets the {@link View} description. It briefly describes the view and is
   5498      * primarily used for accessibility support. Set this property to enable
   5499      * better accessibility support for your application. This is especially
   5500      * true for views that do not have textual representation (For example,
   5501      * ImageButton).
   5502      *
   5503      * @return The content description.
   5504      *
   5505      * @attr ref android.R.styleable#View_contentDescription
   5506      */
   5507     @ViewDebug.ExportedProperty(category = "accessibility")
   5508     public CharSequence getContentDescription() {
   5509         return mContentDescription;
   5510     }
   5511 
   5512     /**
   5513      * Sets the {@link View} description. It briefly describes the view and is
   5514      * primarily used for accessibility support. Set this property to enable
   5515      * better accessibility support for your application. This is especially
   5516      * true for views that do not have textual representation (For example,
   5517      * ImageButton).
   5518      *
   5519      * @param contentDescription The content description.
   5520      *
   5521      * @attr ref android.R.styleable#View_contentDescription
   5522      */
   5523     @RemotableViewMethod
   5524     public void setContentDescription(CharSequence contentDescription) {
   5525         if (mContentDescription == null) {
   5526             if (contentDescription == null) {
   5527                 return;
   5528             }
   5529         } else if (mContentDescription.equals(contentDescription)) {
   5530             return;
   5531         }
   5532         mContentDescription = contentDescription;
   5533         final boolean nonEmptyDesc = contentDescription != null && contentDescription.length() > 0;
   5534         if (nonEmptyDesc && getImportantForAccessibility() == IMPORTANT_FOR_ACCESSIBILITY_AUTO) {
   5535             setImportantForAccessibility(IMPORTANT_FOR_ACCESSIBILITY_YES);
   5536             notifySubtreeAccessibilityStateChangedIfNeeded();
   5537         } else {
   5538             notifyViewAccessibilityStateChangedIfNeeded(
   5539                     AccessibilityEvent.CONTENT_CHANGE_TYPE_CONTENT_DESCRIPTION);
   5540         }
   5541     }
   5542 
   5543     /**
   5544      * Gets the id of a view for which this view serves as a label for
   5545      * accessibility purposes.
   5546      *
   5547      * @return The labeled view id.
   5548      */
   5549     @ViewDebug.ExportedProperty(category = "accessibility")
   5550     public int getLabelFor() {
   5551         return mLabelForId;
   5552     }
   5553 
   5554     /**
   5555      * Sets the id of a view for which this view serves as a label for
   5556      * accessibility purposes.
   5557      *
   5558      * @param id The labeled view id.
   5559      */
   5560     @RemotableViewMethod
   5561     public void setLabelFor(int id) {
   5562         mLabelForId = id;
   5563         if (mLabelForId != View.NO_ID
   5564                 && mID == View.NO_ID) {
   5565             mID = generateViewId();
   5566         }
   5567     }
   5568 
   5569     /**
   5570      * Invoked whenever this view loses focus, either by losing window focus or by losing
   5571      * focus within its window. This method can be used to clear any state tied to the
   5572      * focus. For instance, if a button is held pressed with the trackball and the window
   5573      * loses focus, this method can be used to cancel the press.
   5574      *
   5575      * Subclasses of View overriding this method should always call super.onFocusLost().
   5576      *
   5577      * @see #onFocusChanged(boolean, int, android.graphics.Rect)
   5578      * @see #onWindowFocusChanged(boolean)
   5579      *
   5580      * @hide pending API council approval
   5581      */
   5582     protected void onFocusLost() {
   5583         resetPressedState();
   5584     }
   5585 
   5586     private void resetPressedState() {
   5587         if ((mViewFlags & ENABLED_MASK) == DISABLED) {
   5588             return;
   5589         }
   5590 
   5591         if (isPressed()) {
   5592             setPressed(false);
   5593 
   5594             if (!mHasPerformedLongPress) {
   5595                 removeLongPressCallback();
   5596             }
   5597         }
   5598     }
   5599 
   5600     /**
   5601      * Returns true if this view has focus
   5602      *
   5603      * @return True if this view has focus, false otherwise.
   5604      */
   5605     @ViewDebug.ExportedProperty(category = "focus")
   5606     public boolean isFocused() {
   5607         return (mPrivateFlags & PFLAG_FOCUSED) != 0;
   5608     }
   5609 
   5610     /**
   5611      * Find the view in the hierarchy rooted at this view that currently has
   5612      * focus.
   5613      *
   5614      * @return The view that currently has focus, or null if no focused view can
   5615      *         be found.
   5616      */
   5617     public View findFocus() {
   5618         return (mPrivateFlags & PFLAG_FOCUSED) != 0 ? this : null;
   5619     }
   5620 
   5621     /**
   5622      * Indicates whether this view is one of the set of scrollable containers in
   5623      * its window.
   5624      *
   5625      * @return whether this view is one of the set of scrollable containers in
   5626      * its window
   5627      *
   5628      * @attr ref android.R.styleable#View_isScrollContainer
   5629      */
   5630     public boolean isScrollContainer() {
   5631         return (mPrivateFlags & PFLAG_SCROLL_CONTAINER_ADDED) != 0;
   5632     }
   5633 
   5634     /**
   5635      * Change whether this view is one of the set of scrollable containers in
   5636      * its window.  This will be used to determine whether the window can
   5637      * resize or must pan when a soft input area is open -- scrollable
   5638      * containers allow the window to use resize mode since the container
   5639      * will appropriately shrink.
   5640      *
   5641      * @attr ref android.R.styleable#View_isScrollContainer
   5642      */
   5643     public void setScrollContainer(boolean isScrollContainer) {
   5644         if (isScrollContainer) {
   5645             if (mAttachInfo != null && (mPrivateFlags&PFLAG_SCROLL_CONTAINER_ADDED) == 0) {
   5646                 mAttachInfo.mScrollContainers.add(this);
   5647                 mPrivateFlags |= PFLAG_SCROLL_CONTAINER_ADDED;
   5648             }
   5649             mPrivateFlags |= PFLAG_SCROLL_CONTAINER;
   5650         } else {
   5651             if ((mPrivateFlags&PFLAG_SCROLL_CONTAINER_ADDED) != 0) {
   5652                 mAttachInfo.mScrollContainers.remove(this);
   5653             }
   5654             mPrivateFlags &= ~(PFLAG_SCROLL_CONTAINER|PFLAG_SCROLL_CONTAINER_ADDED);
   5655         }
   5656     }
   5657 
   5658     /**
   5659      * Returns the quality of the drawing cache.
   5660      *
   5661      * @return One of {@link #DRAWING_CACHE_QUALITY_AUTO},
   5662      *         {@link #DRAWING_CACHE_QUALITY_LOW}, or {@link #DRAWING_CACHE_QUALITY_HIGH}
   5663      *
   5664      * @see #setDrawingCacheQuality(int)
   5665      * @see #setDrawingCacheEnabled(boolean)
   5666      * @see #isDrawingCacheEnabled()
   5667      *
   5668      * @attr ref android.R.styleable#View_drawingCacheQuality
   5669      */
   5670     public int getDrawingCacheQuality() {
   5671         return mViewFlags & DRAWING_CACHE_QUALITY_MASK;
   5672     }
   5673 
   5674     /**
   5675      * Set the drawing cache quality of this view. This value is used only when the
   5676      * drawing cache is enabled
   5677      *
   5678      * @param quality One of {@link #DRAWING_CACHE_QUALITY_AUTO},
   5679      *        {@link #DRAWING_CACHE_QUALITY_LOW}, or {@link #DRAWING_CACHE_QUALITY_HIGH}
   5680      *
   5681      * @see #getDrawingCacheQuality()
   5682      * @see #setDrawingCacheEnabled(boolean)
   5683      * @see #isDrawingCacheEnabled()
   5684      *
   5685      * @attr ref android.R.styleable#View_drawingCacheQuality
   5686      */
   5687     public void setDrawingCacheQuality(int quality) {
   5688         setFlags(quality, DRAWING_CACHE_QUALITY_MASK);
   5689     }
   5690 
   5691     /**
   5692      * Returns whether the screen should remain on, corresponding to the current
   5693      * value of {@link #KEEP_SCREEN_ON}.
   5694      *
   5695      * @return Returns true if {@link #KEEP_SCREEN_ON} is set.
   5696      *
   5697      * @see #setKeepScreenOn(boolean)
   5698      *
   5699      * @attr ref android.R.styleable#View_keepScreenOn
   5700      */
   5701     public boolean getKeepScreenOn() {
   5702         return (mViewFlags & KEEP_SCREEN_ON) != 0;
   5703     }
   5704 
   5705     /**
   5706      * Controls whether the screen should remain on, modifying the
   5707      * value of {@link #KEEP_SCREEN_ON}.
   5708      *
   5709      * @param keepScreenOn Supply true to set {@link #KEEP_SCREEN_ON}.
   5710      *
   5711      * @see #getKeepScreenOn()
   5712      *
   5713      * @attr ref android.R.styleable#View_keepScreenOn
   5714      */
   5715     public void setKeepScreenOn(boolean keepScreenOn) {
   5716         setFlags(keepScreenOn ? KEEP_SCREEN_ON : 0, KEEP_SCREEN_ON);
   5717     }
   5718 
   5719     /**
   5720      * Gets the id of the view to use when the next focus is {@link #FOCUS_LEFT}.
   5721      * @return The next focus ID, or {@link #NO_ID} if the framework should decide automatically.
   5722      *
   5723      * @attr ref android.R.styleable#View_nextFocusLeft
   5724      */
   5725     public int getNextFocusLeftId() {
   5726         return mNextFocusLeftId;
   5727     }
   5728 
   5729     /**
   5730      * Sets the id of the view to use when the next focus is {@link #FOCUS_LEFT}.
   5731      * @param nextFocusLeftId The next focus ID, or {@link #NO_ID} if the framework should
   5732      * decide automatically.
   5733      *
   5734      * @attr ref android.R.styleable#View_nextFocusLeft
   5735      */
   5736     public void setNextFocusLeftId(int nextFocusLeftId) {
   5737         mNextFocusLeftId = nextFocusLeftId;
   5738     }
   5739 
   5740     /**
   5741      * Gets the id of the view to use when the next focus is {@link #FOCUS_RIGHT}.
   5742      * @return The next focus ID, or {@link #NO_ID} if the framework should decide automatically.
   5743      *
   5744      * @attr ref android.R.styleable#View_nextFocusRight
   5745      */
   5746     public int getNextFocusRightId() {
   5747         return mNextFocusRightId;
   5748     }
   5749 
   5750     /**
   5751      * Sets the id of the view to use when the next focus is {@link #FOCUS_RIGHT}.
   5752      * @param nextFocusRightId The next focus ID, or {@link #NO_ID} if the framework should
   5753      * decide automatically.
   5754      *
   5755      * @attr ref android.R.styleable#View_nextFocusRight
   5756      */
   5757     public void setNextFocusRightId(int nextFocusRightId) {
   5758         mNextFocusRightId = nextFocusRightId;
   5759     }
   5760 
   5761     /**
   5762      * Gets the id of the view to use when the next focus is {@link #FOCUS_UP}.
   5763      * @return The next focus ID, or {@link #NO_ID} if the framework should decide automatically.
   5764      *
   5765      * @attr ref android.R.styleable#View_nextFocusUp
   5766      */
   5767     public int getNextFocusUpId() {
   5768         return mNextFocusUpId;
   5769     }
   5770 
   5771     /**
   5772      * Sets the id of the view to use when the next focus is {@link #FOCUS_UP}.
   5773      * @param nextFocusUpId The next focus ID, or {@link #NO_ID} if the framework should
   5774      * decide automatically.
   5775      *
   5776      * @attr ref android.R.styleable#View_nextFocusUp
   5777      */
   5778     public void setNextFocusUpId(int nextFocusUpId) {
   5779         mNextFocusUpId = nextFocusUpId;
   5780     }
   5781 
   5782     /**
   5783      * Gets the id of the view to use when the next focus is {@link #FOCUS_DOWN}.
   5784      * @return The next focus ID, or {@link #NO_ID} if the framework should decide automatically.
   5785      *
   5786      * @attr ref android.R.styleable#View_nextFocusDown
   5787      */
   5788     public int getNextFocusDownId() {
   5789         return mNextFocusDownId;
   5790     }
   5791 
   5792     /**
   5793      * Sets the id of the view to use when the next focus is {@link #FOCUS_DOWN}.
   5794      * @param nextFocusDownId The next focus ID, or {@link #NO_ID} if the framework should
   5795      * decide automatically.
   5796      *
   5797      * @attr ref android.R.styleable#View_nextFocusDown
   5798      */
   5799     public void setNextFocusDownId(int nextFocusDownId) {
   5800         mNextFocusDownId = nextFocusDownId;
   5801     }
   5802 
   5803     /**
   5804      * Gets the id of the view to use when the next focus is {@link #FOCUS_FORWARD}.
   5805      * @return The next focus ID, or {@link #NO_ID} if the framework should decide automatically.
   5806      *
   5807      * @attr ref android.R.styleable#View_nextFocusForward
   5808      */
   5809     public int getNextFocusForwardId() {
   5810         return mNextFocusForwardId;
   5811     }
   5812 
   5813     /**
   5814      * Sets the id of the view to use when the next focus is {@link #FOCUS_FORWARD}.
   5815      * @param nextFocusForwardId The next focus ID, or {@link #NO_ID} if the framework should
   5816      * decide automatically.
   5817      *
   5818      * @attr ref android.R.styleable#View_nextFocusForward
   5819      */
   5820     public void setNextFocusForwardId(int nextFocusForwardId) {
   5821         mNextFocusForwardId = nextFocusForwardId;
   5822     }
   5823 
   5824     /**
   5825      * Returns the visibility of this view and all of its ancestors
   5826      *
   5827      * @return True if this view and all of its ancestors are {@link #VISIBLE}
   5828      */
   5829     public boolean isShown() {
   5830         View current = this;
   5831         //noinspection ConstantConditions
   5832         do {
   5833             if ((current.mViewFlags & VISIBILITY_MASK) != VISIBLE) {
   5834                 return false;
   5835             }
   5836             ViewParent parent = current.mParent;
   5837             if (parent == null) {
   5838                 return false; // We are not attached to the view root
   5839             }
   5840             if (!(parent instanceof View)) {
   5841                 return true;
   5842             }
   5843             current = (View) parent;
   5844         } while (current != null);
   5845 
   5846         return false;
   5847     }
   5848 
   5849     /**
   5850      * Called by the view hierarchy when the content insets for a window have
   5851      * changed, to allow it to adjust its content to fit within those windows.
   5852      * The content insets tell you the space that the status bar, input method,
   5853      * and other system windows infringe on the application's window.
   5854      *
   5855      * <p>You do not normally need to deal with this function, since the default
   5856      * window decoration given to applications takes care of applying it to the
   5857      * content of the window.  If you use {@link #SYSTEM_UI_FLAG_LAYOUT_FULLSCREEN}
   5858      * or {@link #SYSTEM_UI_FLAG_LAYOUT_HIDE_NAVIGATION} this will not be the case,
   5859      * and your content can be placed under those system elements.  You can then
   5860      * use this method within your view hierarchy if you have parts of your UI
   5861      * which you would like to ensure are not being covered.
   5862      *
   5863      * <p>The default implementation of this method simply applies the content
   5864      * insets to the view's padding, consuming that content (modifying the
   5865      * insets to be 0), and returning true.  This behavior is off by default, but can
   5866      * be enabled through {@link #setFitsSystemWindows(boolean)}.
   5867      *
   5868      * <p>This function's traversal down the hierarchy is depth-first.  The same content
   5869      * insets object is propagated down the hierarchy, so any changes made to it will
   5870      * be seen by all following views (including potentially ones above in
   5871      * the hierarchy since this is a depth-first traversal).  The first view
   5872      * that returns true will abort the entire traversal.
   5873      *
   5874      * <p>The default implementation works well for a situation where it is
   5875      * used with a container that covers the entire window, allowing it to
   5876      * apply the appropriate insets to its content on all edges.  If you need
   5877      * a more complicated layout (such as two different views fitting system
   5878      * windows, one on the top of the window, and one on the bottom),
   5879      * you can override the method and handle the insets however you would like.
   5880      * Note that the insets provided by the framework are always relative to the
   5881      * far edges of the window, not accounting for the location of the called view
   5882      * within that window.  (In fact when this method is called you do not yet know
   5883      * where the layout will place the view, as it is done before layout happens.)
   5884      *
   5885      * <p>Note: unlike many View methods, there is no dispatch phase to this
   5886      * call.  If you are overriding it in a ViewGroup and want to allow the
   5887      * call to continue to your children, you must be sure to call the super
   5888      * implementation.
   5889      *
   5890      * <p>Here is a sample layout that makes use of fitting system windows
   5891      * to have controls for a video view placed inside of the window decorations
   5892      * that it hides and shows.  This can be used with code like the second
   5893      * sample (video player) shown in {@link #setSystemUiVisibility(int)}.
   5894      *
   5895      * {@sample development/samples/ApiDemos/res/layout/video_player.xml complete}
   5896      *
   5897      * @param insets Current content insets of the window.  Prior to
   5898      * {@link android.os.Build.VERSION_CODES#JELLY_BEAN} you must not modify
   5899      * the insets or else you and Android will be unhappy.
   5900      *
   5901      * @return {@code true} if this view applied the insets and it should not
   5902      * continue propagating further down the hierarchy, {@code false} otherwise.
   5903      * @see #getFitsSystemWindows()
   5904      * @see #setFitsSystemWindows(boolean)
   5905      * @see #setSystemUiVisibility(int)
   5906      */
   5907     protected boolean fitSystemWindows(Rect insets) {
   5908         if ((mViewFlags & FITS_SYSTEM_WINDOWS) == FITS_SYSTEM_WINDOWS) {
   5909             mUserPaddingStart = UNDEFINED_PADDING;
   5910             mUserPaddingEnd = UNDEFINED_PADDING;
   5911             Rect localInsets = sThreadLocal.get();
   5912             if (localInsets == null) {
   5913                 localInsets = new Rect();
   5914                 sThreadLocal.set(localInsets);
   5915             }
   5916             boolean res = computeFitSystemWindows(insets, localInsets);
   5917             mUserPaddingLeftInitial = localInsets.left;
   5918             mUserPaddingRightInitial = localInsets.right;
   5919             internalSetPadding(localInsets.left, localInsets.top,
   5920                     localInsets.right, localInsets.bottom);
   5921             return res;
   5922         }
   5923         return false;
   5924     }
   5925 
   5926     /**
   5927      * @hide Compute the insets that should be consumed by this view and the ones
   5928      * that should propagate to those under it.
   5929      */
   5930     protected boolean computeFitSystemWindows(Rect inoutInsets, Rect outLocalInsets) {
   5931         if ((mViewFlags & OPTIONAL_FITS_SYSTEM_WINDOWS) == 0
   5932                 || mAttachInfo == null
   5933                 || ((mAttachInfo.mSystemUiVisibility & SYSTEM_UI_LAYOUT_FLAGS) == 0
   5934                         && !mAttachInfo.mOverscanRequested)) {
   5935             outLocalInsets.set(inoutInsets);
   5936             inoutInsets.set(0, 0, 0, 0);
   5937             return true;
   5938         } else {
   5939             // The application wants to take care of fitting system window for
   5940             // the content...  however we still need to take care of any overscan here.
   5941             final Rect overscan = mAttachInfo.mOverscanInsets;
   5942             outLocalInsets.set(overscan);
   5943             inoutInsets.left -= overscan.left;
   5944             inoutInsets.top -= overscan.top;
   5945             inoutInsets.right -= overscan.right;
   5946             inoutInsets.bottom -= overscan.bottom;
   5947             return false;
   5948         }
   5949     }
   5950 
   5951     /**
   5952      * Sets whether or not this view should account for system screen decorations
   5953      * such as the status bar and inset its content; that is, controlling whether
   5954      * the default implementation of {@link #fitSystemWindows(Rect)} will be
   5955      * executed.  See that method for more details.
   5956      *
   5957      * <p>Note that if you are providing your own implementation of
   5958      * {@link #fitSystemWindows(Rect)}, then there is no need to set this
   5959      * flag to true -- your implementation will be overriding the default
   5960      * implementation that checks this flag.
   5961      *
   5962      * @param fitSystemWindows If true, then the default implementation of
   5963      * {@link #fitSystemWindows(Rect)} will be executed.
   5964      *
   5965      * @attr ref android.R.styleable#View_fitsSystemWindows
   5966      * @see #getFitsSystemWindows()
   5967      * @see #fitSystemWindows(Rect)
   5968      * @see #setSystemUiVisibility(int)
   5969      */
   5970     public void setFitsSystemWindows(boolean fitSystemWindows) {
   5971         setFlags(fitSystemWindows ? FITS_SYSTEM_WINDOWS : 0, FITS_SYSTEM_WINDOWS);
   5972     }
   5973 
   5974     /**
   5975      * Check for state of {@link #setFitsSystemWindows(boolean)}. If this method
   5976      * returns {@code true}, the default implementation of {@link #fitSystemWindows(Rect)}
   5977      * will be executed.
   5978      *
   5979      * @return {@code true} if the default implementation of
   5980      * {@link #fitSystemWindows(Rect)} will be executed.
   5981      *
   5982      * @attr ref android.R.styleable#View_fitsSystemWindows
   5983      * @see #setFitsSystemWindows(boolean)
   5984      * @see #fitSystemWindows(Rect)
   5985      * @see #setSystemUiVisibility(int)
   5986      */
   5987     public boolean getFitsSystemWindows() {
   5988         return (mViewFlags & FITS_SYSTEM_WINDOWS) == FITS_SYSTEM_WINDOWS;
   5989     }
   5990 
   5991     /** @hide */
   5992     public boolean fitsSystemWindows() {
   5993         return getFitsSystemWindows();
   5994     }
   5995 
   5996     /**
   5997      * Ask that a new dispatch of {@link #fitSystemWindows(Rect)} be performed.
   5998      */
   5999     public void requestFitSystemWindows() {
   6000         if (mParent != null) {
   6001             mParent.requestFitSystemWindows();
   6002         }
   6003     }
   6004 
   6005     /**
   6006      * For use by PhoneWindow to make its own system window fitting optional.
   6007      * @hide
   6008      */
   6009     public void makeOptionalFitsSystemWindows() {
   6010         setFlags(OPTIONAL_FITS_SYSTEM_WINDOWS, OPTIONAL_FITS_SYSTEM_WINDOWS);
   6011     }
   6012 
   6013     /**
   6014      * Returns the visibility status for this view.
   6015      *
   6016      * @return One of {@link #VISIBLE}, {@link #INVISIBLE}, or {@link #GONE}.
   6017      * @attr ref android.R.styleable#View_visibility
   6018      */
   6019     @ViewDebug.ExportedProperty(mapping = {
   6020         @ViewDebug.IntToString(from = VISIBLE,   to = "VISIBLE"),
   6021         @ViewDebug.IntToString(from = INVISIBLE, to = "INVISIBLE"),
   6022         @ViewDebug.IntToString(from = GONE,      to = "GONE")
   6023     })
   6024     public int getVisibility() {
   6025         return mViewFlags & VISIBILITY_MASK;
   6026     }
   6027 
   6028     /**
   6029      * Set the enabled state of this view.
   6030      *
   6031      * @param visibility One of {@link #VISIBLE}, {@link #INVISIBLE}, or {@link #GONE}.
   6032      * @attr ref android.R.styleable#View_visibility
   6033      */
   6034     @RemotableViewMethod
   6035     public void setVisibility(int visibility) {
   6036         setFlags(visibility, VISIBILITY_MASK);
   6037         if (mBackground != null) mBackground.setVisible(visibility == VISIBLE, false);
   6038     }
   6039 
   6040     /**
   6041      * Returns the enabled status for this view. The interpretation of the
   6042      * enabled state varies by subclass.
   6043      *
   6044      * @return True if this view is enabled, false otherwise.
   6045      */
   6046     @ViewDebug.ExportedProperty
   6047     public boolean isEnabled() {
   6048         return (mViewFlags & ENABLED_MASK) == ENABLED;
   6049     }
   6050 
   6051     /**
   6052      * Set the enabled state of this view. The interpretation of the enabled
   6053      * state varies by subclass.
   6054      *
   6055      * @param enabled True if this view is enabled, false otherwise.
   6056      */
   6057     @RemotableViewMethod
   6058     public void setEnabled(boolean enabled) {
   6059         if (enabled == isEnabled()) return;
   6060 
   6061         setFlags(enabled ? ENABLED : DISABLED, ENABLED_MASK);
   6062 
   6063         /*
   6064          * The View most likely has to change its appearance, so refresh
   6065          * the drawable state.
   6066          */
   6067         refreshDrawableState();
   6068 
   6069         // Invalidate too, since the default behavior for views is to be
   6070         // be drawn at 50% alpha rather than to change the drawable.
   6071         invalidate(true);
   6072 
   6073         if (!enabled) {
   6074             cancelPendingInputEvents();
   6075         }
   6076     }
   6077 
   6078     /**
   6079      * Set whether this view can receive the focus.
   6080      *
   6081      * Setting this to false will also ensure that this view is not focusable
   6082      * in touch mode.
   6083      *
   6084      * @param focusable If true, this view can receive the focus.
   6085      *
   6086      * @see #setFocusableInTouchMode(boolean)
   6087      * @attr ref android.R.styleable#View_focusable
   6088      */
   6089     public void setFocusable(boolean focusable) {
   6090         if (!focusable) {
   6091             setFlags(0, FOCUSABLE_IN_TOUCH_MODE);
   6092         }
   6093         setFlags(focusable ? FOCUSABLE : NOT_FOCUSABLE, FOCUSABLE_MASK);
   6094     }
   6095 
   6096     /**
   6097      * Set whether this view can receive focus while in touch mode.
   6098      *
   6099      * Setting this to true will also ensure that this view is focusable.
   6100      *
   6101      * @param focusableInTouchMode If true, this view can receive the focus while
   6102      *   in touch mode.
   6103      *
   6104      * @see #setFocusable(boolean)
   6105      * @attr ref android.R.styleable#View_focusableInTouchMode
   6106      */
   6107     public void setFocusableInTouchMode(boolean focusableInTouchMode) {
   6108         // Focusable in touch mode should always be set before the focusable flag
   6109         // otherwise, setting the focusable flag will trigger a focusableViewAvailable()
   6110         // which, in touch mode, will not successfully request focus on this view
   6111         // because the focusable in touch mode flag is not set
   6112         setFlags(focusableInTouchMode ? FOCUSABLE_IN_TOUCH_MODE : 0, FOCUSABLE_IN_TOUCH_MODE);
   6113         if (focusableInTouchMode) {
   6114             setFlags(FOCUSABLE, FOCUSABLE_MASK);
   6115         }
   6116     }
   6117 
   6118     /**
   6119      * Set whether this view should have sound effects enabled for events such as
   6120      * clicking and touching.
   6121      *
   6122      * <p>You may wish to disable sound effects for a view if you already play sounds,
   6123      * for instance, a dial key that plays dtmf tones.
   6124      *
   6125      * @param soundEffectsEnabled whether sound effects are enabled for this view.
   6126      * @see #isSoundEffectsEnabled()
   6127      * @see #playSoundEffect(int)
   6128      * @attr ref android.R.styleable#View_soundEffectsEnabled
   6129      */
   6130     public void setSoundEffectsEnabled(boolean soundEffectsEnabled) {
   6131         setFlags(soundEffectsEnabled ? SOUND_EFFECTS_ENABLED: 0, SOUND_EFFECTS_ENABLED);
   6132     }
   6133 
   6134     /**
   6135      * @return whether this view should have sound effects enabled for events such as
   6136      *     clicking and touching.
   6137      *
   6138      * @see #setSoundEffectsEnabled(boolean)
   6139      * @see #playSoundEffect(int)
   6140      * @attr ref android.R.styleable#View_soundEffectsEnabled
   6141      */
   6142     @ViewDebug.ExportedProperty
   6143     public boolean isSoundEffectsEnabled() {
   6144         return SOUND_EFFECTS_ENABLED == (mViewFlags & SOUND_EFFECTS_ENABLED);
   6145     }
   6146 
   6147     /**
   6148      * Set whether this view should have haptic feedback for events such as
   6149      * long presses.
   6150      *
   6151      * <p>You may wish to disable haptic feedback if your view already controls
   6152      * its own haptic feedback.
   6153      *
   6154      * @param hapticFeedbackEnabled whether haptic feedback enabled for this view.
   6155      * @see #isHapticFeedbackEnabled()
   6156      * @see #performHapticFeedback(int)
   6157      * @attr ref android.R.styleable#View_hapticFeedbackEnabled
   6158      */
   6159     public void setHapticFeedbackEnabled(boolean hapticFeedbackEnabled) {
   6160         setFlags(hapticFeedbackEnabled ? HAPTIC_FEEDBACK_ENABLED: 0, HAPTIC_FEEDBACK_ENABLED);
   6161     }
   6162 
   6163     /**
   6164      * @return whether this view should have haptic feedback enabled for events
   6165      * long presses.
   6166      *
   6167      * @see #setHapticFeedbackEnabled(boolean)
   6168      * @see #performHapticFeedback(int)
   6169      * @attr ref android.R.styleable#View_hapticFeedbackEnabled
   6170      */
   6171     @ViewDebug.ExportedProperty
   6172     public boolean isHapticFeedbackEnabled() {
   6173         return HAPTIC_FEEDBACK_ENABLED == (mViewFlags & HAPTIC_FEEDBACK_ENABLED);
   6174     }
   6175 
   6176     /**
   6177      * Returns the layout direction for this view.
   6178      *
   6179      * @return One of {@link #LAYOUT_DIRECTION_LTR},
   6180      *   {@link #LAYOUT_DIRECTION_RTL},
   6181      *   {@link #LAYOUT_DIRECTION_INHERIT} or
   6182      *   {@link #LAYOUT_DIRECTION_LOCALE}.
   6183      *
   6184      * @attr ref android.R.styleable#View_layoutDirection
   6185      *
   6186      * @hide
   6187      */
   6188     @ViewDebug.ExportedProperty(category = "layout", mapping = {
   6189         @ViewDebug.IntToString(from = LAYOUT_DIRECTION_LTR,     to = "LTR"),
   6190         @ViewDebug.IntToString(from = LAYOUT_DIRECTION_RTL,     to = "RTL"),
   6191         @ViewDebug.IntToString(from = LAYOUT_DIRECTION_INHERIT, to = "INHERIT"),
   6192         @ViewDebug.IntToString(from = LAYOUT_DIRECTION_LOCALE,  to = "LOCALE")
   6193     })
   6194     public int getRawLayoutDirection() {
   6195         return (mPrivateFlags2 & PFLAG2_LAYOUT_DIRECTION_MASK) >> PFLAG2_LAYOUT_DIRECTION_MASK_SHIFT;
   6196     }
   6197 
   6198     /**
   6199      * Set the layout direction for this view. This will propagate a reset of layout direction
   6200      * resolution to the view's children and resolve layout direction for this view.
   6201      *
   6202      * @param layoutDirection the layout direction to set. Should be one of:
   6203      *
   6204      * {@link #LAYOUT_DIRECTION_LTR},
   6205      * {@link #LAYOUT_DIRECTION_RTL},
   6206      * {@link #LAYOUT_DIRECTION_INHERIT},
   6207      * {@link #LAYOUT_DIRECTION_LOCALE}.
   6208      *
   6209      * Resolution will be done if the value is set to LAYOUT_DIRECTION_INHERIT. The resolution
   6210      * proceeds up the parent chain of the view to get the value. If there is no parent, then it
   6211      * will return the default {@link #LAYOUT_DIRECTION_LTR}.
   6212      *
   6213      * @attr ref android.R.styleable#View_layoutDirection
   6214      */
   6215     @RemotableViewMethod
   6216     public void setLayoutDirection(int layoutDirection) {
   6217         if (getRawLayoutDirection() != layoutDirection) {
   6218             // Reset the current layout direction and the resolved one
   6219             mPrivateFlags2 &= ~PFLAG2_LAYOUT_DIRECTION_MASK;
   6220             resetRtlProperties();
   6221             // Set the new layout direction (filtered)
   6222             mPrivateFlags2 |=
   6223                     ((layoutDirection << PFLAG2_LAYOUT_DIRECTION_MASK_SHIFT) & PFLAG2_LAYOUT_DIRECTION_MASK);
   6224             // We need to resolve all RTL properties as they all depend on layout direction
   6225             resolveRtlPropertiesIfNeeded();
   6226             requestLayout();
   6227             invalidate(true);
   6228         }
   6229     }
   6230 
   6231     /**
   6232      * Returns the resolved layout direction for this view.
   6233      *
   6234      * @return {@link #LAYOUT_DIRECTION_RTL} if the layout direction is RTL or returns
   6235      * {@link #LAYOUT_DIRECTION_LTR} if the layout direction is not RTL.
   6236      *
   6237      * For compatibility, this will return {@link #LAYOUT_DIRECTION_LTR} if API version
   6238      * is lower than {@link android.os.Build.VERSION_CODES#JELLY_BEAN_MR1}.
   6239      *
   6240      * @attr ref android.R.styleable#View_layoutDirection
   6241      */
   6242     @ViewDebug.ExportedProperty(category = "layout", mapping = {
   6243         @ViewDebug.IntToString(from = LAYOUT_DIRECTION_LTR, to = "RESOLVED_DIRECTION_LTR"),
   6244         @ViewDebug.IntToString(from = LAYOUT_DIRECTION_RTL, to = "RESOLVED_DIRECTION_RTL")
   6245     })
   6246     public int getLayoutDirection() {
   6247         final int targetSdkVersion = getContext().getApplicationInfo().targetSdkVersion;
   6248         if (targetSdkVersion < JELLY_BEAN_MR1) {
   6249             mPrivateFlags2 |= PFLAG2_LAYOUT_DIRECTION_RESOLVED;
   6250             return LAYOUT_DIRECTION_RESOLVED_DEFAULT;
   6251         }
   6252         return ((mPrivateFlags2 & PFLAG2_LAYOUT_DIRECTION_RESOLVED_RTL) ==
   6253                 PFLAG2_LAYOUT_DIRECTION_RESOLVED_RTL) ? LAYOUT_DIRECTION_RTL : LAYOUT_DIRECTION_LTR;
   6254     }
   6255 
   6256     /**
   6257      * Indicates whether or not this view's layout is right-to-left. This is resolved from
   6258      * layout attribute and/or the inherited value from the parent
   6259      *
   6260      * @return true if the layout is right-to-left.
   6261      *
   6262      * @hide
   6263      */
   6264     @ViewDebug.ExportedProperty(category = "layout")
   6265     public boolean isLayoutRtl() {
   6266         return (getLayoutDirection() == LAYOUT_DIRECTION_RTL);
   6267     }
   6268 
   6269     /**
   6270      * Indicates whether the view is currently tracking transient state that the
   6271      * app should not need to concern itself with saving and restoring, but that
   6272      * the framework should take special note to preserve when possible.
   6273      *
   6274      * <p>A view with transient state cannot be trivially rebound from an external
   6275      * data source, such as an adapter binding item views in a list. This may be
   6276      * because the view is performing an animation, tracking user selection
   6277      * of content, or similar.</p>
   6278      *
   6279      * @return true if the view has transient state
   6280      */
   6281     @ViewDebug.ExportedProperty(category = "layout")
   6282     public boolean hasTransientState() {
   6283         return (mPrivateFlags2 & PFLAG2_HAS_TRANSIENT_STATE) == PFLAG2_HAS_TRANSIENT_STATE;
   6284     }
   6285 
   6286     /**
   6287      * Set whether this view is currently tracking transient state that the
   6288      * framework should attempt to preserve when possible. This flag is reference counted,
   6289      * so every call to setHasTransientState(true) should be paired with a later call
   6290      * to setHasTransientState(false).
   6291      *
   6292      * <p>A view with transient state cannot be trivially rebound from an external
   6293      * data source, such as an adapter binding item views in a list. This may be
   6294      * because the view is performing an animation, tracking user selection
   6295      * of content, or similar.</p>
   6296      *
   6297      * @param hasTransientState true if this view has transient state
   6298      */
   6299     public void setHasTransientState(boolean hasTransientState) {
   6300         mTransientStateCount = hasTransientState ? mTransientStateCount + 1 :
   6301                 mTransientStateCount - 1;
   6302         if (mTransientStateCount < 0) {
   6303             mTransientStateCount = 0;
   6304             Log.e(VIEW_LOG_TAG, "hasTransientState decremented below 0: " +
   6305                     "unmatched pair of setHasTransientState calls");
   6306         } else if ((hasTransientState && mTransientStateCount == 1) ||
   6307                 (!hasTransientState && mTransientStateCount == 0)) {
   6308             // update flag if we've just incremented up from 0 or decremented down to 0
   6309             mPrivateFlags2 = (mPrivateFlags2 & ~PFLAG2_HAS_TRANSIENT_STATE) |
   6310                     (hasTransientState ? PFLAG2_HAS_TRANSIENT_STATE : 0);
   6311             if (mParent != null) {
   6312                 try {
   6313                     mParent.childHasTransientStateChanged(this, hasTransientState);
   6314                 } catch (AbstractMethodError e) {
   6315                     Log.e(VIEW_LOG_TAG, mParent.getClass().getSimpleName() +
   6316                             " does not fully implement ViewParent", e);
   6317                 }
   6318             }
   6319         }
   6320     }
   6321 
   6322     /**
   6323      * Returns true if this view is currently attached to a window.
   6324      */
   6325     public boolean isAttachedToWindow() {
   6326         return mAttachInfo != null;
   6327     }
   6328 
   6329     /**
   6330      * Returns true if this view has been through at least one layout since it
   6331      * was last attached to or detached from a window.
   6332      */
   6333     public boolean isLaidOut() {
   6334         return (mPrivateFlags3 & PFLAG3_IS_LAID_OUT) == PFLAG3_IS_LAID_OUT;
   6335     }
   6336 
   6337     /**
   6338      * If this view doesn't do any drawing on its own, set this flag to
   6339      * allow further optimizations. By default, this flag is not set on
   6340      * View, but could be set on some View subclasses such as ViewGroup.
   6341      *
   6342      * Typically, if you override {@link #onDraw(android.graphics.Canvas)}
   6343      * you should clear this flag.
   6344      *
   6345      * @param willNotDraw whether or not this View draw on its own
   6346      */
   6347     public void setWillNotDraw(boolean willNotDraw) {
   6348         setFlags(willNotDraw ? WILL_NOT_DRAW : 0, DRAW_MASK);
   6349     }
   6350 
   6351     /**
   6352      * Returns whether or not this View draws on its own.
   6353      *
   6354      * @return true if this view has nothing to draw, false otherwise
   6355      */
   6356     @ViewDebug.ExportedProperty(category = "drawing")
   6357     public boolean willNotDraw() {
   6358         return (mViewFlags & DRAW_MASK) == WILL_NOT_DRAW;
   6359     }
   6360 
   6361     /**
   6362      * When a View's drawing cache is enabled, drawing is redirected to an
   6363      * offscreen bitmap. Some views, like an ImageView, must be able to
   6364      * bypass this mechanism if they already draw a single bitmap, to avoid
   6365      * unnecessary usage of the memory.
   6366      *
   6367      * @param willNotCacheDrawing true if this view does not cache its
   6368      *        drawing, false otherwise
   6369      */
   6370     public void setWillNotCacheDrawing(boolean willNotCacheDrawing) {
   6371         setFlags(willNotCacheDrawing ? WILL_NOT_CACHE_DRAWING : 0, WILL_NOT_CACHE_DRAWING);
   6372     }
   6373 
   6374     /**
   6375      * Returns whether or not this View can cache its drawing or not.
   6376      *
   6377      * @return true if this view does not cache its drawing, false otherwise
   6378      */
   6379     @ViewDebug.ExportedProperty(category = "drawing")
   6380     public boolean willNotCacheDrawing() {
   6381         return (mViewFlags & WILL_NOT_CACHE_DRAWING) == WILL_NOT_CACHE_DRAWING;
   6382     }
   6383 
   6384     /**
   6385      * Indicates whether this view reacts to click events or not.
   6386      *
   6387      * @return true if the view is clickable, false otherwise
   6388      *
   6389      * @see #setClickable(boolean)
   6390      * @attr ref android.R.styleable#View_clickable
   6391      */
   6392     @ViewDebug.ExportedProperty
   6393     public boolean isClickable() {
   6394         return (mViewFlags & CLICKABLE) == CLICKABLE;
   6395     }
   6396 
   6397     /**
   6398      * Enables or disables click events for this view. When a view
   6399      * is clickable it will change its state to "pressed" on every click.
   6400      * Subclasses should set the view clickable to visually react to
   6401      * user's clicks.
   6402      *
   6403      * @param clickable true to make the view clickable, false otherwise
   6404      *
   6405      * @see #isClickable()
   6406      * @attr ref android.R.styleable#View_clickable
   6407      */
   6408     public void setClickable(boolean clickable) {
   6409         setFlags(clickable ? CLICKABLE : 0, CLICKABLE);
   6410     }
   6411 
   6412     /**
   6413      * Indicates whether this view reacts to long click events or not.
   6414      *
   6415      * @return true if the view is long clickable, false otherwise
   6416      *
   6417      * @see #setLongClickable(boolean)
   6418      * @attr ref android.R.styleable#View_longClickable
   6419      */
   6420     public boolean isLongClickable() {
   6421         return (mViewFlags & LONG_CLICKABLE) == LONG_CLICKABLE;
   6422     }
   6423 
   6424     /**
   6425      * Enables or disables long click events for this view. When a view is long
   6426      * clickable it reacts to the user holding down the button for a longer
   6427      * duration than a tap. This event can either launch the listener or a
   6428      * context menu.
   6429      *
   6430      * @param longClickable true to make the view long clickable, false otherwise
   6431      * @see #isLongClickable()
   6432      * @attr ref android.R.styleable#View_longClickable
   6433      */
   6434     public void setLongClickable(boolean longClickable) {
   6435         setFlags(longClickable ? LONG_CLICKABLE : 0, LONG_CLICKABLE);
   6436     }
   6437 
   6438     /**
   6439      * Sets the pressed state for this view.
   6440      *
   6441      * @see #isClickable()
   6442      * @see #setClickable(boolean)
   6443      *
   6444      * @param pressed Pass true to set the View's internal state to "pressed", or false to reverts
   6445      *        the View's internal state from a previously set "pressed" state.
   6446      */
   6447     public void setPressed(boolean pressed) {
   6448         final boolean needsRefresh = pressed != ((mPrivateFlags & PFLAG_PRESSED) == PFLAG_PRESSED);
   6449 
   6450         if (pressed) {
   6451             mPrivateFlags |= PFLAG_PRESSED;
   6452         } else {
   6453             mPrivateFlags &= ~PFLAG_PRESSED;
   6454         }
   6455 
   6456         if (needsRefresh) {
   6457             refreshDrawableState();
   6458         }
   6459         dispatchSetPressed(pressed);
   6460     }
   6461 
   6462     /**
   6463      * Dispatch setPressed to all of this View's children.
   6464      *
   6465      * @see #setPressed(boolean)
   6466      *
   6467      * @param pressed The new pressed state
   6468      */
   6469     protected void dispatchSetPressed(boolean pressed) {
   6470     }
   6471 
   6472     /**
   6473      * Indicates whether the view is currently in pressed state. Unless
   6474      * {@link #setPressed(boolean)} is explicitly called, only clickable views can enter
   6475      * the pressed state.
   6476      *
   6477      * @see #setPressed(boolean)
   6478      * @see #isClickable()
   6479      * @see #setClickable(boolean)
   6480      *
   6481      * @return true if the view is currently pressed, false otherwise
   6482      */
   6483     public boolean isPressed() {
   6484         return (mPrivateFlags & PFLAG_PRESSED) == PFLAG_PRESSED;
   6485     }
   6486 
   6487     /**
   6488      * Indicates whether this view will save its state (that is,
   6489      * whether its {@link #onSaveInstanceState} method will be called).
   6490      *
   6491      * @return Returns true if the view state saving is enabled, else false.
   6492      *
   6493      * @see #setSaveEnabled(boolean)
   6494      * @attr ref android.R.styleable#View_saveEnabled
   6495      */
   6496     public boolean isSaveEnabled() {
   6497         return (mViewFlags & SAVE_DISABLED_MASK) != SAVE_DISABLED;
   6498     }
   6499 
   6500     /**
   6501      * Controls whether the saving of this view's state is
   6502      * enabled (that is, whether its {@link #onSaveInstanceState} method
   6503      * will be called).  Note that even if freezing is enabled, the
   6504      * view still must have an id assigned to it (via {@link #setId(int)})
   6505      * for its state to be saved.  This flag can only disable the
   6506      * saving of this view; any child views may still have their state saved.
   6507      *
   6508      * @param enabled Set to false to <em>disable</em> state saving, or true
   6509      * (the default) to allow it.
   6510      *
   6511      * @see #isSaveEnabled()
   6512      * @see #setId(int)
   6513      * @see #onSaveInstanceState()
   6514      * @attr ref android.R.styleable#View_saveEnabled
   6515      */
   6516     public void setSaveEnabled(boolean enabled) {
   6517         setFlags(enabled ? 0 : SAVE_DISABLED, SAVE_DISABLED_MASK);
   6518     }
   6519 
   6520     /**
   6521      * Gets whether the framework should discard touches when the view's
   6522      * window is obscured by another visible window.
   6523      * Refer to the {@link View} security documentation for more details.
   6524      *
   6525      * @return True if touch filtering is enabled.
   6526      *
   6527      * @see #setFilterTouchesWhenObscured(boolean)
   6528      * @attr ref android.R.styleable#View_filterTouchesWhenObscured
   6529      */
   6530     @ViewDebug.ExportedProperty
   6531     public boolean getFilterTouchesWhenObscured() {
   6532         return (mViewFlags & FILTER_TOUCHES_WHEN_OBSCURED) != 0;
   6533     }
   6534 
   6535     /**
   6536      * Sets whether the framework should discard touches when the view's
   6537      * window is obscured by another visible window.
   6538      * Refer to the {@link View} security documentation for more details.
   6539      *
   6540      * @param enabled True if touch filtering should be enabled.
   6541      *
   6542      * @see #getFilterTouchesWhenObscured
   6543      * @attr ref android.R.styleable#View_filterTouchesWhenObscured
   6544      */
   6545     public void setFilterTouchesWhenObscured(boolean enabled) {
   6546         setFlags(enabled ? FILTER_TOUCHES_WHEN_OBSCURED : 0,
   6547                 FILTER_TOUCHES_WHEN_OBSCURED);
   6548     }
   6549 
   6550     /**
   6551      * Indicates whether the entire hierarchy under this view will save its
   6552      * state when a state saving traversal occurs from its parent.  The default
   6553      * is true; if false, these views will not be saved unless
   6554      * {@link #saveHierarchyState(SparseArray)} is called directly on this view.
   6555      *
   6556      * @return Returns true if the view state saving from parent is enabled, else false.
   6557      *
   6558      * @see #setSaveFromParentEnabled(boolean)
   6559      */
   6560     public boolean isSaveFromParentEnabled() {
   6561         return (mViewFlags & PARENT_SAVE_DISABLED_MASK) != PARENT_SAVE_DISABLED;
   6562     }
   6563 
   6564     /**
   6565      * Controls whether the entire hierarchy under this view will save its
   6566      * state when a state saving traversal occurs from its parent.  The default
   6567      * is true; if false, these views will not be saved unless
   6568      * {@link #saveHierarchyState(SparseArray)} is called directly on this view.
   6569      *
   6570      * @param enabled Set to false to <em>disable</em> state saving, or true
   6571      * (the default) to allow it.
   6572      *
   6573      * @see #isSaveFromParentEnabled()
   6574      * @see #setId(int)
   6575      * @see #onSaveInstanceState()
   6576      */
   6577     public void setSaveFromParentEnabled(boolean enabled) {
   6578         setFlags(enabled ? 0 : PARENT_SAVE_DISABLED, PARENT_SAVE_DISABLED_MASK);
   6579     }
   6580 
   6581 
   6582     /**
   6583      * Returns whether this View is able to take focus.
   6584      *
   6585      * @return True if this view can take focus, or false otherwise.
   6586      * @attr ref android.R.styleable#View_focusable
   6587      */
   6588     @ViewDebug.ExportedProperty(category = "focus")
   6589     public final boolean isFocusable() {
   6590         return FOCUSABLE == (mViewFlags & FOCUSABLE_MASK);
   6591     }
   6592 
   6593     /**
   6594      * When a view is focusable, it may not want to take focus when in touch mode.
   6595      * For example, a button would like focus when the user is navigating via a D-pad
   6596      * so that the user can click on it, but once the user starts touching the screen,
   6597      * the button shouldn't take focus
   6598      * @return Whether the view is focusable in touch mode.
   6599      * @attr ref android.R.styleable#View_focusableInTouchMode
   6600      */
   6601     @ViewDebug.ExportedProperty
   6602     public final boolean isFocusableInTouchMode() {
   6603         return FOCUSABLE_IN_TOUCH_MODE == (mViewFlags & FOCUSABLE_IN_TOUCH_MODE);
   6604     }
   6605 
   6606     /**
   6607      * Find the nearest view in the specified direction that can take focus.
   6608      * This does not actually give focus to that view.
   6609      *
   6610      * @param direction One of FOCUS_UP, FOCUS_DOWN, FOCUS_LEFT, and FOCUS_RIGHT
   6611      *
   6612      * @return The nearest focusable in the specified direction, or null if none
   6613      *         can be found.
   6614      */
   6615     public View focusSearch(int direction) {
   6616         if (mParent != null) {
   6617             return mParent.focusSearch(this, direction);
   6618         } else {
   6619             return null;
   6620         }
   6621     }
   6622 
   6623     /**
   6624      * This method is the last chance for the focused view and its ancestors to
   6625      * respond to an arrow key. This is called when the focused view did not
   6626      * consume the key internally, nor could the view system find a new view in
   6627      * the requested direction to give focus to.
   6628      *
   6629      * @param focused The currently focused view.
   6630      * @param direction The direction focus wants to move. One of FOCUS_UP,
   6631      *        FOCUS_DOWN, FOCUS_LEFT, and FOCUS_RIGHT.
   6632      * @return True if the this view consumed this unhandled move.
   6633      */
   6634     public boolean dispatchUnhandledMove(View focused, int direction) {
   6635         return false;
   6636     }
   6637 
   6638     /**
   6639      * If a user manually specified the next view id for a particular direction,
   6640      * use the root to look up the view.
   6641      * @param root The root view of the hierarchy containing this view.
   6642      * @param direction One of FOCUS_UP, FOCUS_DOWN, FOCUS_LEFT, FOCUS_RIGHT, FOCUS_FORWARD,
   6643      * or FOCUS_BACKWARD.
   6644      * @return The user specified next view, or null if there is none.
   6645      */
   6646     View findUserSetNextFocus(View root, int direction) {
   6647         switch (direction) {
   6648             case FOCUS_LEFT:
   6649                 if (mNextFocusLeftId == View.NO_ID) return null;
   6650                 return findViewInsideOutShouldExist(root, mNextFocusLeftId);
   6651             case FOCUS_RIGHT:
   6652                 if (mNextFocusRightId == View.NO_ID) return null;
   6653                 return findViewInsideOutShouldExist(root, mNextFocusRightId);
   6654             case FOCUS_UP:
   6655                 if (mNextFocusUpId == View.NO_ID) return null;
   6656                 return findViewInsideOutShouldExist(root, mNextFocusUpId);
   6657             case FOCUS_DOWN:
   6658                 if (mNextFocusDownId == View.NO_ID) return null;
   6659                 return findViewInsideOutShouldExist(root, mNextFocusDownId);
   6660             case FOCUS_FORWARD:
   6661                 if (mNextFocusForwardId == View.NO_ID) return null;
   6662                 return findViewInsideOutShouldExist(root, mNextFocusForwardId);
   6663             case FOCUS_BACKWARD: {
   6664                 if (mID == View.NO_ID) return null;
   6665                 final int id = mID;
   6666                 return root.findViewByPredicateInsideOut(this, new Predicate<View>() {
   6667                     @Override
   6668                     public boolean apply(View t) {
   6669                         return t.mNextFocusForwardId == id;
   6670                     }
   6671                 });
   6672             }
   6673         }
   6674         return null;
   6675     }
   6676 
   6677     private View findViewInsideOutShouldExist(View root, int id) {
   6678         if (mMatchIdPredicate == null) {
   6679             mMatchIdPredicate = new MatchIdPredicate();
   6680         }
   6681         mMatchIdPredicate.mId = id;
   6682         View result = root.findViewByPredicateInsideOut(this, mMatchIdPredicate);
   6683         if (result == null) {
   6684             Log.w(VIEW_LOG_TAG, "couldn't find view with id " + id);
   6685         }
   6686         return result;
   6687     }
   6688 
   6689     /**
   6690      * Find and return all focusable views that are descendants of this view,
   6691      * possibly including this view if it is focusable itself.
   6692      *
   6693      * @param direction The direction of the focus
   6694      * @return A list of focusable views
   6695      */
   6696     public ArrayList<View> getFocusables(int direction) {
   6697         ArrayList<View> result = new ArrayList<View>(24);
   6698         addFocusables(result, direction);
   6699         return result;
   6700     }
   6701 
   6702     /**
   6703      * Add any focusable views that are descendants of this view (possibly
   6704      * including this view if it is focusable itself) to views.  If we are in touch mode,
   6705      * only add views that are also focusable in touch mode.
   6706      *
   6707      * @param views Focusable views found so far
   6708      * @param direction The direction of the focus
   6709      */
   6710     public void addFocusables(ArrayList<View> views, int direction) {
   6711         addFocusables(views, direction, FOCUSABLES_TOUCH_MODE);
   6712     }
   6713 
   6714     /**
   6715      * Adds any focusable views that are descendants of this view (possibly
   6716      * including this view if it is focusable itself) to views. This method
   6717      * adds all focusable views regardless if we are in touch mode or
   6718      * only views focusable in touch mode if we are in touch mode or
   6719      * only views that can take accessibility focus if accessibility is enabeld
   6720      * depending on the focusable mode paramater.
   6721      *
   6722      * @param views Focusable views found so far or null if all we are interested is
   6723      *        the number of focusables.
   6724      * @param direction The direction of the focus.
   6725      * @param focusableMode The type of focusables to be added.
   6726      *
   6727      * @see #FOCUSABLES_ALL
   6728      * @see #FOCUSABLES_TOUCH_MODE
   6729      */
   6730     public void addFocusables(ArrayList<View> views, int direction, int focusableMode) {
   6731         if (views == null) {
   6732             return;
   6733         }
   6734         if (!isFocusable()) {
   6735             return;
   6736         }
   6737         if ((focusableMode & FOCUSABLES_TOUCH_MODE) == FOCUSABLES_TOUCH_MODE
   6738                 && isInTouchMode() && !isFocusableInTouchMode()) {
   6739             return;
   6740         }
   6741         views.add(this);
   6742     }
   6743 
   6744     /**
   6745      * Finds the Views that contain given text. The containment is case insensitive.
   6746      * The search is performed by either the text that the View renders or the content
   6747      * description that describes the view for accessibility purposes and the view does
   6748      * not render or both. Clients can specify how the search is to be performed via
   6749      * passing the {@link #FIND_VIEWS_WITH_TEXT} and
   6750      * {@link #FIND_VIEWS_WITH_CONTENT_DESCRIPTION} flags.
   6751      *
   6752      * @param outViews The output list of matching Views.
   6753      * @param searched The text to match against.
   6754      *
   6755      * @see #FIND_VIEWS_WITH_TEXT
   6756      * @see #FIND_VIEWS_WITH_CONTENT_DESCRIPTION
   6757      * @see #setContentDescription(CharSequence)
   6758      */
   6759     public void findViewsWithText(ArrayList<View> outViews, CharSequence searched, int flags) {
   6760         if (getAccessibilityNodeProvider() != null) {
   6761             if ((flags & FIND_VIEWS_WITH_ACCESSIBILITY_NODE_PROVIDERS) != 0) {
   6762                 outViews.add(this);
   6763             }
   6764         } else if ((flags & FIND_VIEWS_WITH_CONTENT_DESCRIPTION) != 0
   6765                 && (searched != null && searched.length() > 0)
   6766                 && (mContentDescription != null && mContentDescription.length() > 0)) {
   6767             String searchedLowerCase = searched.toString().toLowerCase();
   6768             String contentDescriptionLowerCase = mContentDescription.toString().toLowerCase();
   6769             if (contentDescriptionLowerCase.contains(searchedLowerCase)) {
   6770                 outViews.add(this);
   6771             }
   6772         }
   6773     }
   6774 
   6775     /**
   6776      * Find and return all touchable views that are descendants of this view,
   6777      * possibly including this view if it is touchable itself.
   6778      *
   6779      * @return A list of touchable views
   6780      */
   6781     public ArrayList<View> getTouchables() {
   6782         ArrayList<View> result = new ArrayList<View>();
   6783         addTouchables(result);
   6784         return result;
   6785     }
   6786 
   6787     /**
   6788      * Add any touchable views that are descendants of this view (possibly
   6789      * including this view if it is touchable itself) to views.
   6790      *
   6791      * @param views Touchable views found so far
   6792      */
   6793     public void addTouchables(ArrayList<View> views) {
   6794         final int viewFlags = mViewFlags;
   6795 
   6796         if (((viewFlags & CLICKABLE) == CLICKABLE || (viewFlags & LONG_CLICKABLE) == LONG_CLICKABLE)
   6797                 && (viewFlags & ENABLED_MASK) == ENABLED) {
   6798             views.add(this);
   6799         }
   6800     }
   6801 
   6802     /**
   6803      * Returns whether this View is accessibility focused.
   6804      *
   6805      * @return True if this View is accessibility focused.
   6806      * @hide
   6807      */
   6808     public boolean isAccessibilityFocused() {
   6809         return (mPrivateFlags2 & PFLAG2_ACCESSIBILITY_FOCUSED) != 0;
   6810     }
   6811 
   6812     /**
   6813      * Call this to try to give accessibility focus to this view.
   6814      *
   6815      * A view will not actually take focus if {@link AccessibilityManager#isEnabled()}
   6816      * returns false or the view is no visible or the view already has accessibility
   6817      * focus.
   6818      *
   6819      * See also {@link #focusSearch(int)}, which is what you call to say that you
   6820      * have focus, and you want your parent to look for the next one.
   6821      *
   6822      * @return Whether this view actually took accessibility focus.
   6823      *
   6824      * @hide
   6825      */
   6826     public boolean requestAccessibilityFocus() {
   6827         AccessibilityManager manager = AccessibilityManager.getInstance(mContext);
   6828         if (!manager.isEnabled() || !manager.isTouchExplorationEnabled()) {
   6829             return false;
   6830         }
   6831         if ((mViewFlags & VISIBILITY_MASK) != VISIBLE) {
   6832             return false;
   6833         }
   6834         if ((mPrivateFlags2 & PFLAG2_ACCESSIBILITY_FOCUSED) == 0) {
   6835             mPrivateFlags2 |= PFLAG2_ACCESSIBILITY_FOCUSED;
   6836             ViewRootImpl viewRootImpl = getViewRootImpl();
   6837             if (viewRootImpl != null) {
   6838                 viewRootImpl.setAccessibilityFocus(this, null);
   6839             }
   6840             invalidate();
   6841             sendAccessibilityEvent(AccessibilityEvent.TYPE_VIEW_ACCESSIBILITY_FOCUSED);
   6842             return true;
   6843         }
   6844         return false;
   6845     }
   6846 
   6847     /**
   6848      * Call this to try to clear accessibility focus of this view.
   6849      *
   6850      * See also {@link #focusSearch(int)}, which is what you call to say that you
   6851      * have focus, and you want your parent to look for the next one.
   6852      *
   6853      * @hide
   6854      */
   6855     public void clearAccessibilityFocus() {
   6856         clearAccessibilityFocusNoCallbacks();
   6857         // Clear the global reference of accessibility focus if this
   6858         // view or any of its descendants had accessibility focus.
   6859         ViewRootImpl viewRootImpl = getViewRootImpl();
   6860         if (viewRootImpl != null) {
   6861             View focusHost = viewRootImpl.getAccessibilityFocusedHost();
   6862             if (focusHost != null && ViewRootImpl.isViewDescendantOf(focusHost, this)) {
   6863                 viewRootImpl.setAccessibilityFocus(null, null);
   6864             }
   6865         }
   6866     }
   6867 
   6868     private void sendAccessibilityHoverEvent(int eventType) {
   6869         // Since we are not delivering to a client accessibility events from not
   6870         // important views (unless the clinet request that) we need to fire the
   6871         // event from the deepest view exposed to the client. As a consequence if
   6872         // the user crosses a not exposed view the client will see enter and exit
   6873         // of the exposed predecessor followed by and enter and exit of that same
   6874         // predecessor when entering and exiting the not exposed descendant. This
   6875         // is fine since the client has a clear idea which view is hovered at the
   6876         // price of a couple more events being sent. This is a simple and
   6877         // working solution.
   6878         View source = this;
   6879         while (true) {
   6880             if (source.includeForAccessibility()) {
   6881                 source.sendAccessibilityEvent(eventType);
   6882                 return;
   6883             }
   6884             ViewParent parent = source.getParent();
   6885             if (parent instanceof View) {
   6886                 source = (View) parent;
   6887             } else {
   6888                 return;
   6889             }
   6890         }
   6891     }
   6892 
   6893     /**
   6894      * Clears accessibility focus without calling any callback methods
   6895      * normally invoked in {@link #clearAccessibilityFocus()}. This method
   6896      * is used for clearing accessibility focus when giving this focus to
   6897      * another view.
   6898      */
   6899     void clearAccessibilityFocusNoCallbacks() {
   6900         if ((mPrivateFlags2 & PFLAG2_ACCESSIBILITY_FOCUSED) != 0) {
   6901             mPrivateFlags2 &= ~PFLAG2_ACCESSIBILITY_FOCUSED;
   6902             invalidate();
   6903             sendAccessibilityEvent(AccessibilityEvent.TYPE_VIEW_ACCESSIBILITY_FOCUS_CLEARED);
   6904         }
   6905     }
   6906 
   6907     /**
   6908      * Call this to try to give focus to a specific view or to one of its
   6909      * descendants.
   6910      *
   6911      * A view will not actually take focus if it is not focusable ({@link #isFocusable} returns
   6912      * false), or if it is focusable and it is not focusable in touch mode
   6913      * ({@link #isFocusableInTouchMode}) while the device is in touch mode.
   6914      *
   6915      * See also {@link #focusSearch(int)}, which is what you call to say that you
   6916      * have focus, and you want your parent to look for the next one.
   6917      *
   6918      * This is equivalent to calling {@link #requestFocus(int, Rect)} with arguments
   6919      * {@link #FOCUS_DOWN} and <code>null</code>.
   6920      *
   6921      * @return Whether this view or one of its descendants actually took focus.
   6922      */
   6923     public final boolean requestFocus() {
   6924         return requestFocus(View.FOCUS_DOWN);
   6925     }
   6926 
   6927     /**
   6928      * Call this to try to give focus to a specific view or to one of its
   6929      * descendants and give it a hint about what direction focus is heading.
   6930      *
   6931      * A view will not actually take focus if it is not focusable ({@link #isFocusable} returns
   6932      * false), or if it is focusable and it is not focusable in touch mode
   6933      * ({@link #isFocusableInTouchMode}) while the device is in touch mode.
   6934      *
   6935      * See also {@link #focusSearch(int)}, which is what you call to say that you
   6936      * have focus, and you want your parent to look for the next one.
   6937      *
   6938      * This is equivalent to calling {@link #requestFocus(int, Rect)} with
   6939      * <code>null</code> set for the previously focused rectangle.
   6940      *
   6941      * @param direction One of FOCUS_UP, FOCUS_DOWN, FOCUS_LEFT, and FOCUS_RIGHT
   6942      * @return Whether this view or one of its descendants actually took focus.
   6943      */
   6944     public final boolean requestFocus(int direction) {
   6945         return requestFocus(direction, null);
   6946     }
   6947 
   6948     /**
   6949      * Call this to try to give focus to a specific view or to one of its descendants
   6950      * and give it hints about the direction and a specific rectangle that the focus
   6951      * is coming from.  The rectangle can help give larger views a finer grained hint
   6952      * about where focus is coming from, and therefore, where to show selection, or
   6953      * forward focus change internally.
   6954      *
   6955      * A view will not actually take focus if it is not focusable ({@link #isFocusable} returns
   6956      * false), or if it is focusable and it is not focusable in touch mode
   6957      * ({@link #isFocusableInTouchMode}) while the device is in touch mode.
   6958      *
   6959      * A View will not take focus if it is not visible.
   6960      *
   6961      * A View will not take focus if one of its parents has
   6962      * {@link android.view.ViewGroup#getDescendantFocusability()} equal to
   6963      * {@link ViewGroup#FOCUS_BLOCK_DESCENDANTS}.
   6964      *
   6965      * See also {@link #focusSearch(int)}, which is what you call to say that you
   6966      * have focus, and you want your parent to look for the next one.
   6967      *
   6968      * You may wish to override this method if your custom {@link View} has an internal
   6969      * {@link View} that it wishes to forward the request to.
   6970      *
   6971      * @param direction One of FOCUS_UP, FOCUS_DOWN, FOCUS_LEFT, and FOCUS_RIGHT
   6972      * @param previouslyFocusedRect The rectangle (in this View's coordinate system)
   6973      *        to give a finer grained hint about where focus is coming from.  May be null
   6974      *        if there is no hint.
   6975      * @return Whether this view or one of its descendants actually took focus.
   6976      */
   6977     public boolean requestFocus(int direction, Rect previouslyFocusedRect) {
   6978         return requestFocusNoSearch(direction, previouslyFocusedRect);
   6979     }
   6980 
   6981     private boolean requestFocusNoSearch(int direction, Rect previouslyFocusedRect) {
   6982         // need to be focusable
   6983         if ((mViewFlags & FOCUSABLE_MASK) != FOCUSABLE ||
   6984                 (mViewFlags & VISIBILITY_MASK) != VISIBLE) {
   6985             return false;
   6986         }
   6987 
   6988         // need to be focusable in touch mode if in touch mode
   6989         if (isInTouchMode() &&
   6990             (FOCUSABLE_IN_TOUCH_MODE != (mViewFlags & FOCUSABLE_IN_TOUCH_MODE))) {
   6991                return false;
   6992         }
   6993 
   6994         // need to not have any parents blocking us
   6995         if (hasAncestorThatBlocksDescendantFocus()) {
   6996             return false;
   6997         }
   6998 
   6999         handleFocusGainInternal(direction, previouslyFocusedRect);
   7000         return true;
   7001     }
   7002 
   7003     /**
   7004      * Call this to try to give focus to a specific view or to one of its descendants. This is a
   7005      * special variant of {@link #requestFocus() } that will allow views that are not focuable in
   7006      * touch mode to request focus when they are touched.
   7007      *
   7008      * @return Whether this view or one of its descendants actually took focus.
   7009      *
   7010      * @see #isInTouchMode()
   7011      *
   7012      */
   7013     public final boolean requestFocusFromTouch() {
   7014         // Leave touch mode if we need to
   7015         if (isInTouchMode()) {
   7016             ViewRootImpl viewRoot = getViewRootImpl();
   7017             if (viewRoot != null) {
   7018                 viewRoot.ensureTouchMode(false);
   7019             }
   7020         }
   7021         return requestFocus(View.FOCUS_DOWN);
   7022     }
   7023 
   7024     /**
   7025      * @return Whether any ancestor of this view blocks descendant focus.
   7026      */
   7027     private boolean hasAncestorThatBlocksDescendantFocus() {
   7028         ViewParent ancestor = mParent;
   7029         while (ancestor instanceof ViewGroup) {
   7030             final ViewGroup vgAncestor = (ViewGroup) ancestor;
   7031             if (vgAncestor.getDescendantFocusability() == ViewGroup.FOCUS_BLOCK_DESCENDANTS) {
   7032                 return true;
   7033             } else {
   7034                 ancestor = vgAncestor.getParent();
   7035             }
   7036         }
   7037         return false;
   7038     }
   7039 
   7040     /**
   7041      * Gets the mode for determining whether this View is important for accessibility
   7042      * which is if it fires accessibility events and if it is reported to
   7043      * accessibility services that query the screen.
   7044      *
   7045      * @return The mode for determining whether a View is important for accessibility.
   7046      *
   7047      * @attr ref android.R.styleable#View_importantForAccessibility
   7048      *
   7049      * @see #IMPORTANT_FOR_ACCESSIBILITY_YES
   7050      * @see #IMPORTANT_FOR_ACCESSIBILITY_NO
   7051      * @see #IMPORTANT_FOR_ACCESSIBILITY_NO_HIDE_DESCENDANTS
   7052      * @see #IMPORTANT_FOR_ACCESSIBILITY_AUTO
   7053      */
   7054     @ViewDebug.ExportedProperty(category = "accessibility", mapping = {
   7055             @ViewDebug.IntToString(from = IMPORTANT_FOR_ACCESSIBILITY_AUTO, to = "auto"),
   7056             @ViewDebug.IntToString(from = IMPORTANT_FOR_ACCESSIBILITY_YES, to = "yes"),
   7057             @ViewDebug.IntToString(from = IMPORTANT_FOR_ACCESSIBILITY_NO, to = "no"),
   7058             @ViewDebug.IntToString(from = IMPORTANT_FOR_ACCESSIBILITY_NO_HIDE_DESCENDANTS,
   7059                     to = "noHideDescendants")
   7060         })
   7061     public int getImportantForAccessibility() {
   7062         return (mPrivateFlags2 & PFLAG2_IMPORTANT_FOR_ACCESSIBILITY_MASK)
   7063                 >> PFLAG2_IMPORTANT_FOR_ACCESSIBILITY_SHIFT;
   7064     }
   7065 
   7066     /**
   7067      * Sets the live region mode for this view. This indicates to accessibility
   7068      * services whether they should automatically notify the user about changes
   7069      * to the view's content description or text, or to the content descriptions
   7070      * or text of the view's children (where applicable).
   7071      * <p>
   7072      * For example, in a login screen with a TextView that displays an "incorrect
   7073      * password" notification, that view should be marked as a live region with
   7074      * mode {@link #ACCESSIBILITY_LIVE_REGION_POLITE}.
   7075      * <p>
   7076      * To disable change notifications for this view, use
   7077      * {@link #ACCESSIBILITY_LIVE_REGION_NONE}. This is the default live region
   7078      * mode for most views.
   7079      * <p>
   7080      * To indicate that the user should be notified of changes, use
   7081      * {@link #ACCESSIBILITY_LIVE_REGION_POLITE}.
   7082      * <p>
   7083      * If the view's changes should interrupt ongoing speech and notify the user
   7084      * immediately, use {@link #ACCESSIBILITY_LIVE_REGION_ASSERTIVE}.
   7085      *
   7086      * @param mode The live region mode for this view, one of:
   7087      *        <ul>
   7088      *        <li>{@link #ACCESSIBILITY_LIVE_REGION_NONE}
   7089      *        <li>{@link #ACCESSIBILITY_LIVE_REGION_POLITE}
   7090      *        <li>{@link #ACCESSIBILITY_LIVE_REGION_ASSERTIVE}
   7091      *        </ul>
   7092      * @attr ref android.R.styleable#View_accessibilityLiveRegion
   7093      */
   7094     public void setAccessibilityLiveRegion(int mode) {
   7095         if (mode != getAccessibilityLiveRegion()) {
   7096             mPrivateFlags2 &= ~PFLAG2_ACCESSIBILITY_LIVE_REGION_MASK;
   7097             mPrivateFlags2 |= (mode << PFLAG2_ACCESSIBILITY_LIVE_REGION_SHIFT)
   7098                     & PFLAG2_ACCESSIBILITY_LIVE_REGION_MASK;
   7099             notifyViewAccessibilityStateChangedIfNeeded(
   7100                     AccessibilityEvent.CONTENT_CHANGE_TYPE_UNDEFINED);
   7101         }
   7102     }
   7103 
   7104     /**
   7105      * Gets the live region mode for this View.
   7106      *
   7107      * @return The live region mode for the view.
   7108      *
   7109      * @attr ref android.R.styleable#View_accessibilityLiveRegion
   7110      *
   7111      * @see #setAccessibilityLiveRegion(int)
   7112      */
   7113     public int getAccessibilityLiveRegion() {
   7114         return (mPrivateFlags2 & PFLAG2_ACCESSIBILITY_LIVE_REGION_MASK)
   7115                 >> PFLAG2_ACCESSIBILITY_LIVE_REGION_SHIFT;
   7116     }
   7117 
   7118     /**
   7119      * Sets how to determine whether this view is important for accessibility
   7120      * which is if it fires accessibility events and if it is reported to
   7121      * accessibility services that query the screen.
   7122      *
   7123      * @param mode How to determine whether this view is important for accessibility.
   7124      *
   7125      * @attr ref android.R.styleable#View_importantForAccessibility
   7126      *
   7127      * @see #IMPORTANT_FOR_ACCESSIBILITY_YES
   7128      * @see #IMPORTANT_FOR_ACCESSIBILITY_NO
   7129      * @see #IMPORTANT_FOR_ACCESSIBILITY_NO_HIDE_DESCENDANTS
   7130      * @see #IMPORTANT_FOR_ACCESSIBILITY_AUTO
   7131      */
   7132     public void setImportantForAccessibility(int mode) {
   7133         final int oldMode = getImportantForAccessibility();
   7134         if (mode != oldMode) {
   7135             // If we're moving between AUTO and another state, we might not need
   7136             // to send a subtree changed notification. We'll store the computed
   7137             // importance, since we'll need to check it later to make sure.
   7138             final boolean maySkipNotify = oldMode == IMPORTANT_FOR_ACCESSIBILITY_AUTO
   7139                     || mode == IMPORTANT_FOR_ACCESSIBILITY_AUTO;
   7140             final boolean oldIncludeForAccessibility = maySkipNotify && includeForAccessibility();
   7141             mPrivateFlags2 &= ~PFLAG2_IMPORTANT_FOR_ACCESSIBILITY_MASK;
   7142             mPrivateFlags2 |= (mode << PFLAG2_IMPORTANT_FOR_ACCESSIBILITY_SHIFT)
   7143                     & PFLAG2_IMPORTANT_FOR_ACCESSIBILITY_MASK;
   7144             if (!maySkipNotify || oldIncludeForAccessibility != includeForAccessibility()) {
   7145                 notifySubtreeAccessibilityStateChangedIfNeeded();
   7146             } else {
   7147                 notifyViewAccessibilityStateChangedIfNeeded(
   7148                         AccessibilityEvent.CONTENT_CHANGE_TYPE_UNDEFINED);
   7149             }
   7150         }
   7151     }
   7152 
   7153     /**
   7154      * Gets whether this view should be exposed for accessibility.
   7155      *
   7156      * @return Whether the view is exposed for accessibility.
   7157      *
   7158      * @hide
   7159      */
   7160     public boolean isImportantForAccessibility() {
   7161         final int mode = (mPrivateFlags2 & PFLAG2_IMPORTANT_FOR_ACCESSIBILITY_MASK)
   7162                 >> PFLAG2_IMPORTANT_FOR_ACCESSIBILITY_SHIFT;
   7163         if (mode == IMPORTANT_FOR_ACCESSIBILITY_NO
   7164                 || mode == IMPORTANT_FOR_ACCESSIBILITY_NO_HIDE_DESCENDANTS) {
   7165             return false;
   7166         }
   7167 
   7168         // Check parent mode to ensure we're not hidden.
   7169         ViewParent parent = mParent;
   7170         while (parent instanceof View) {
   7171             if (((View) parent).getImportantForAccessibility()
   7172                     == IMPORTANT_FOR_ACCESSIBILITY_NO_HIDE_DESCENDANTS) {
   7173                 return false;
   7174             }
   7175             parent = parent.getParent();
   7176         }
   7177 
   7178         return mode == IMPORTANT_FOR_ACCESSIBILITY_YES || isActionableForAccessibility()
   7179                 || hasListenersForAccessibility() || getAccessibilityNodeProvider() != null
   7180                 || getAccessibilityLiveRegion() != ACCESSIBILITY_LIVE_REGION_NONE;
   7181     }
   7182 
   7183     /**
   7184      * Gets the parent for accessibility purposes. Note that the parent for
   7185      * accessibility is not necessary the immediate parent. It is the first
   7186      * predecessor that is important for accessibility.
   7187      *
   7188      * @return The parent for accessibility purposes.
   7189      */
   7190     public ViewParent getParentForAccessibility() {
   7191         if (mParent instanceof View) {
   7192             View parentView = (View) mParent;
   7193             if (parentView.includeForAccessibility()) {
   7194                 return mParent;
   7195             } else {
   7196                 return mParent.getParentForAccessibility();
   7197             }
   7198         }
   7199         return null;
   7200     }
   7201 
   7202     /**
   7203      * Adds the children of a given View for accessibility. Since some Views are
   7204      * not important for accessibility the children for accessibility are not
   7205      * necessarily direct children of the view, rather they are the first level of
   7206      * descendants important for accessibility.
   7207      *
   7208      * @param children The list of children for accessibility.
   7209      */
   7210     public void addChildrenForAccessibility(ArrayList<View> children) {
   7211         if (includeForAccessibility()) {
   7212             children.add(this);
   7213         }
   7214     }
   7215 
   7216     /**
   7217      * Whether to regard this view for accessibility. A view is regarded for
   7218      * accessibility if it is important for accessibility or the querying
   7219      * accessibility service has explicitly requested that view not
   7220      * important for accessibility are regarded.
   7221      *
   7222      * @return Whether to regard the view for accessibility.
   7223      *
   7224      * @hide
   7225      */
   7226     public boolean includeForAccessibility() {
   7227         //noinspection SimplifiableIfStatement
   7228         if (mAttachInfo != null) {
   7229             return (mAttachInfo.mAccessibilityFetchFlags
   7230                     & AccessibilityNodeInfo.FLAG_INCLUDE_NOT_IMPORTANT_VIEWS) != 0
   7231                     || isImportantForAccessibility();
   7232         }
   7233         return false;
   7234     }
   7235 
   7236     /**
   7237      * Returns whether the View is considered actionable from
   7238      * accessibility perspective. Such view are important for
   7239      * accessibility.
   7240      *
   7241      * @return True if the view is actionable for accessibility.
   7242      *
   7243      * @hide
   7244      */
   7245     public boolean isActionableForAccessibility() {
   7246         return (isClickable() || isLongClickable() || isFocusable());
   7247     }
   7248 
   7249     /**
   7250      * Returns whether the View has registered callbacks wich makes it
   7251      * important for accessibility.
   7252      *
   7253      * @return True if the view is actionable for accessibility.
   7254      */
   7255     private boolean hasListenersForAccessibility() {
   7256         ListenerInfo info = getListenerInfo();
   7257         return mTouchDelegate != null || info.mOnKeyListener != null
   7258                 || info.mOnTouchListener != null || info.mOnGenericMotionListener != null
   7259                 || info.mOnHoverListener != null || info.mOnDragListener != null;
   7260     }
   7261 
   7262     /**
   7263      * Notifies that the accessibility state of this view changed. The change
   7264      * is local to this view and does not represent structural changes such
   7265      * as children and parent. For example, the view became focusable. The
   7266      * notification is at at most once every
   7267      * {@link ViewConfiguration#getSendRecurringAccessibilityEventsInterval()}
   7268      * to avoid unnecessary load to the system. Also once a view has a pending
   7269      * notifucation this method is a NOP until the notification has been sent.
   7270      *
   7271      * @hide
   7272      */
   7273     public void notifyViewAccessibilityStateChangedIfNeeded(int changeType) {
   7274         if (!AccessibilityManager.getInstance(mContext).isEnabled()) {
   7275             return;
   7276         }
   7277         if (mSendViewStateChangedAccessibilityEvent == null) {
   7278             mSendViewStateChangedAccessibilityEvent =
   7279                     new SendViewStateChangedAccessibilityEvent();
   7280         }
   7281         mSendViewStateChangedAccessibilityEvent.runOrPost(changeType);
   7282     }
   7283 
   7284     /**
   7285      * Notifies that the accessibility state of this view changed. The change
   7286      * is *not* local to this view and does represent structural changes such
   7287      * as children and parent. For example, the view size changed. The
   7288      * notification is at at most once every
   7289      * {@link ViewConfiguration#getSendRecurringAccessibilityEventsInterval()}
   7290      * to avoid unnecessary load to the system. Also once a view has a pending
   7291      * notifucation this method is a NOP until the notification has been sent.
   7292      *
   7293      * @hide
   7294      */
   7295     public void notifySubtreeAccessibilityStateChangedIfNeeded() {
   7296         if (!AccessibilityManager.getInstance(mContext).isEnabled()) {
   7297             return;
   7298         }
   7299         if ((mPrivateFlags2 & PFLAG2_SUBTREE_ACCESSIBILITY_STATE_CHANGED) == 0) {
   7300             mPrivateFlags2 |= PFLAG2_SUBTREE_ACCESSIBILITY_STATE_CHANGED;
   7301             if (mParent != null) {
   7302                 try {
   7303                     mParent.notifySubtreeAccessibilityStateChanged(
   7304                             this, this, AccessibilityEvent.CONTENT_CHANGE_TYPE_SUBTREE);
   7305                 } catch (AbstractMethodError e) {
   7306                     Log.e(VIEW_LOG_TAG, mParent.getClass().getSimpleName() +
   7307                             " does not fully implement ViewParent", e);
   7308                 }
   7309             }
   7310         }
   7311     }
   7312 
   7313     /**
   7314      * Reset the flag indicating the accessibility state of the subtree rooted
   7315      * at this view changed.
   7316      */
   7317     void resetSubtreeAccessibilityStateChanged() {
   7318         mPrivateFlags2 &= ~PFLAG2_SUBTREE_ACCESSIBILITY_STATE_CHANGED;
   7319     }
   7320 
   7321     /**
   7322      * Performs the specified accessibility action on the view. For
   7323      * possible accessibility actions look at {@link AccessibilityNodeInfo}.
   7324      * <p>
   7325      * If an {@link AccessibilityDelegate} has been specified via calling
   7326      * {@link #setAccessibilityDelegate(AccessibilityDelegate)} its
   7327      * {@link AccessibilityDelegate#performAccessibilityAction(View, int, Bundle)}
   7328      * is responsible for handling this call.
   7329      * </p>
   7330      *
   7331      * @param action The action to perform.
   7332      * @param arguments Optional action arguments.
   7333      * @return Whether the action was performed.
   7334      */
   7335     public boolean performAccessibilityAction(int action, Bundle arguments) {
   7336       if (mAccessibilityDelegate != null) {
   7337           return mAccessibilityDelegate.performAccessibilityAction(this, action, arguments);
   7338       } else {
   7339           return performAccessibilityActionInternal(action, arguments);
   7340       }
   7341     }
   7342 
   7343    /**
   7344     * @see #performAccessibilityAction(int, Bundle)
   7345     *
   7346     * Note: Called from the default {@link AccessibilityDelegate}.
   7347     */
   7348     boolean performAccessibilityActionInternal(int action, Bundle arguments) {
   7349         switch (action) {
   7350             case AccessibilityNodeInfo.ACTION_CLICK: {
   7351                 if (isClickable()) {
   7352                     performClick();
   7353                     return true;
   7354                 }
   7355             } break;
   7356             case AccessibilityNodeInfo.ACTION_LONG_CLICK: {
   7357                 if (isLongClickable()) {
   7358                     performLongClick();
   7359                     return true;
   7360                 }
   7361             } break;
   7362             case AccessibilityNodeInfo.ACTION_FOCUS: {
   7363                 if (!hasFocus()) {
   7364                     // Get out of touch mode since accessibility
   7365                     // wants to move focus around.
   7366                     getViewRootImpl().ensureTouchMode(false);
   7367                     return requestFocus();
   7368                 }
   7369             } break;
   7370             case AccessibilityNodeInfo.ACTION_CLEAR_FOCUS: {
   7371                 if (hasFocus()) {
   7372                     clearFocus();
   7373                     return !isFocused();
   7374                 }
   7375             } break;
   7376             case AccessibilityNodeInfo.ACTION_SELECT: {
   7377                 if (!isSelected()) {
   7378                     setSelected(true);
   7379                     return isSelected();
   7380                 }
   7381             } break;
   7382             case AccessibilityNodeInfo.ACTION_CLEAR_SELECTION: {
   7383                 if (isSelected()) {
   7384                     setSelected(false);
   7385                     return !isSelected();
   7386                 }
   7387             } break;
   7388             case AccessibilityNodeInfo.ACTION_ACCESSIBILITY_FOCUS: {
   7389                 if (!isAccessibilityFocused()) {
   7390                     return requestAccessibilityFocus();
   7391                 }
   7392             } break;
   7393             case AccessibilityNodeInfo.ACTION_CLEAR_ACCESSIBILITY_FOCUS: {
   7394                 if (isAccessibilityFocused()) {
   7395                     clearAccessibilityFocus();
   7396                     return true;
   7397                 }
   7398             } break;
   7399             case AccessibilityNodeInfo.ACTION_NEXT_AT_MOVEMENT_GRANULARITY: {
   7400                 if (arguments != null) {
   7401                     final int granularity = arguments.getInt(
   7402                             AccessibilityNodeInfo.ACTION_ARGUMENT_MOVEMENT_GRANULARITY_INT);
   7403                     final boolean extendSelection = arguments.getBoolean(
   7404                             AccessibilityNodeInfo.ACTION_ARGUMENT_EXTEND_SELECTION_BOOLEAN);
   7405                     return traverseAtGranularity(granularity, true, extendSelection);
   7406                 }
   7407             } break;
   7408             case AccessibilityNodeInfo.ACTION_PREVIOUS_AT_MOVEMENT_GRANULARITY: {
   7409                 if (arguments != null) {
   7410                     final int granularity = arguments.getInt(
   7411                             AccessibilityNodeInfo.ACTION_ARGUMENT_MOVEMENT_GRANULARITY_INT);
   7412                     final boolean extendSelection = arguments.getBoolean(
   7413                             AccessibilityNodeInfo.ACTION_ARGUMENT_EXTEND_SELECTION_BOOLEAN);
   7414                     return traverseAtGranularity(granularity, false, extendSelection);
   7415                 }
   7416             } break;
   7417             case AccessibilityNodeInfo.ACTION_SET_SELECTION: {
   7418                 CharSequence text = getIterableTextForAccessibility();
   7419                 if (text == null) {
   7420                     return false;
   7421                 }
   7422                 final int start = (arguments != null) ? arguments.getInt(
   7423                         AccessibilityNodeInfo.ACTION_ARGUMENT_SELECTION_START_INT, -1) : -1;
   7424                 final int end = (arguments != null) ? arguments.getInt(
   7425                 AccessibilityNodeInfo.ACTION_ARGUMENT_SELECTION_END_INT, -1) : -1;
   7426                 // Only cursor position can be specified (selection length == 0)
   7427                 if ((getAccessibilitySelectionStart() != start
   7428                         || getAccessibilitySelectionEnd() != end)
   7429                         && (start == end)) {
   7430                     setAccessibilitySelection(start, end);
   7431                     notifyViewAccessibilityStateChangedIfNeeded(
   7432                             AccessibilityEvent.CONTENT_CHANGE_TYPE_UNDEFINED);
   7433                     return true;
   7434                 }
   7435             } break;
   7436         }
   7437         return false;
   7438     }
   7439 
   7440     private boolean traverseAtGranularity(int granularity, boolean forward,
   7441             boolean extendSelection) {
   7442         CharSequence text = getIterableTextForAccessibility();
   7443         if (text == null || text.length() == 0) {
   7444             return false;
   7445         }
   7446         TextSegmentIterator iterator = getIteratorForGranularity(granularity);
   7447         if (iterator == null) {
   7448             return false;
   7449         }
   7450         int current = getAccessibilitySelectionEnd();
   7451         if (current == ACCESSIBILITY_CURSOR_POSITION_UNDEFINED) {
   7452             current = forward ? 0 : text.length();
   7453         }
   7454         final int[] range = forward ? iterator.following(current) : iterator.preceding(current);
   7455         if (range == null) {
   7456             return false;
   7457         }
   7458         final int segmentStart = range[0];
   7459         final int segmentEnd = range[1];
   7460         int selectionStart;
   7461         int selectionEnd;
   7462         if (extendSelection && isAccessibilitySelectionExtendable()) {
   7463             selectionStart = getAccessibilitySelectionStart();
   7464             if (selectionStart == ACCESSIBILITY_CURSOR_POSITION_UNDEFINED) {
   7465                 selectionStart = forward ? segmentStart : segmentEnd;
   7466             }
   7467             selectionEnd = forward ? segmentEnd : segmentStart;
   7468         } else {
   7469             selectionStart = selectionEnd= forward ? segmentEnd : segmentStart;
   7470         }
   7471         setAccessibilitySelection(selectionStart, selectionEnd);
   7472         final int action = forward ? AccessibilityNodeInfo.ACTION_NEXT_AT_MOVEMENT_GRANULARITY
   7473                 : AccessibilityNodeInfo.ACTION_PREVIOUS_AT_MOVEMENT_GRANULARITY;
   7474         sendViewTextTraversedAtGranularityEvent(action, granularity, segmentStart, segmentEnd);
   7475         return true;
   7476     }
   7477 
   7478     /**
   7479      * Gets the text reported for accessibility purposes.
   7480      *
   7481      * @return The accessibility text.
   7482      *
   7483      * @hide
   7484      */
   7485     public CharSequence getIterableTextForAccessibility() {
   7486         return getContentDescription();
   7487     }
   7488 
   7489     /**
   7490      * Gets whether accessibility selection can be extended.
   7491      *
   7492      * @return If selection is extensible.
   7493      *
   7494      * @hide
   7495      */
   7496     public boolean isAccessibilitySelectionExtendable() {
   7497         return false;
   7498     }
   7499 
   7500     /**
   7501      * @hide
   7502      */
   7503     public int getAccessibilitySelectionStart() {
   7504         return mAccessibilityCursorPosition;
   7505     }
   7506 
   7507     /**
   7508      * @hide
   7509      */
   7510     public int getAccessibilitySelectionEnd() {
   7511         return getAccessibilitySelectionStart();
   7512     }
   7513 
   7514     /**
   7515      * @hide
   7516      */
   7517     public void setAccessibilitySelection(int start, int end) {
   7518         if (start ==  end && end == mAccessibilityCursorPosition) {
   7519             return;
   7520         }
   7521         if (start >= 0 && start == end && end <= getIterableTextForAccessibility().length()) {
   7522             mAccessibilityCursorPosition = start;
   7523         } else {
   7524             mAccessibilityCursorPosition = ACCESSIBILITY_CURSOR_POSITION_UNDEFINED;
   7525         }
   7526         sendAccessibilityEvent(AccessibilityEvent.TYPE_VIEW_TEXT_SELECTION_CHANGED);
   7527     }
   7528 
   7529     private void sendViewTextTraversedAtGranularityEvent(int action, int granularity,
   7530             int fromIndex, int toIndex) {
   7531         if (mParent == null) {
   7532             return;
   7533         }
   7534         AccessibilityEvent event = AccessibilityEvent.obtain(
   7535                 AccessibilityEvent.TYPE_VIEW_TEXT_TRAVERSED_AT_MOVEMENT_GRANULARITY);
   7536         onInitializeAccessibilityEvent(event);
   7537         onPopulateAccessibilityEvent(event);
   7538         event.setFromIndex(fromIndex);
   7539         event.setToIndex(toIndex);
   7540         event.setAction(action);
   7541         event.setMovementGranularity(granularity);
   7542         mParent.requestSendAccessibilityEvent(this, event);
   7543     }
   7544 
   7545     /**
   7546      * @hide
   7547      */
   7548     public TextSegmentIterator getIteratorForGranularity(int granularity) {
   7549         switch (granularity) {
   7550             case AccessibilityNodeInfo.MOVEMENT_GRANULARITY_CHARACTER: {
   7551                 CharSequence text = getIterableTextForAccessibility();
   7552                 if (text != null && text.length() > 0) {
   7553                     CharacterTextSegmentIterator iterator =
   7554                         CharacterTextSegmentIterator.getInstance(
   7555                                 mContext.getResources().getConfiguration().locale);
   7556                     iterator.initialize(text.toString());
   7557                     return iterator;
   7558                 }
   7559             } break;
   7560             case AccessibilityNodeInfo.MOVEMENT_GRANULARITY_WORD: {
   7561                 CharSequence text = getIterableTextForAccessibility();
   7562                 if (text != null && text.length() > 0) {
   7563                     WordTextSegmentIterator iterator =
   7564                         WordTextSegmentIterator.getInstance(
   7565                                 mContext.getResources().getConfiguration().locale);
   7566                     iterator.initialize(text.toString());
   7567                     return iterator;
   7568                 }
   7569             } break;
   7570             case AccessibilityNodeInfo.MOVEMENT_GRANULARITY_PARAGRAPH: {
   7571                 CharSequence text = getIterableTextForAccessibility();
   7572                 if (text != null && text.length() > 0) {
   7573                     ParagraphTextSegmentIterator iterator =
   7574                         ParagraphTextSegmentIterator.getInstance();
   7575                     iterator.initialize(text.toString());
   7576                     return iterator;
   7577                 }
   7578             } break;
   7579         }
   7580         return null;
   7581     }
   7582 
   7583     /**
   7584      * @hide
   7585      */
   7586     public void dispatchStartTemporaryDetach() {
   7587         clearDisplayList();
   7588 
   7589         onStartTemporaryDetach();
   7590     }
   7591 
   7592     /**
   7593      * This is called when a container is going to temporarily detach a child, with
   7594      * {@link ViewGroup#detachViewFromParent(View) ViewGroup.detachViewFromParent}.
   7595      * It will either be followed by {@link #onFinishTemporaryDetach()} or
   7596      * {@link #onDetachedFromWindow()} when the container is done.
   7597      */
   7598     public void onStartTemporaryDetach() {
   7599         removeUnsetPressCallback();
   7600         mPrivateFlags |= PFLAG_CANCEL_NEXT_UP_EVENT;
   7601     }
   7602 
   7603     /**
   7604      * @hide
   7605      */
   7606     public void dispatchFinishTemporaryDetach() {
   7607         onFinishTemporaryDetach();
   7608     }
   7609 
   7610     /**
   7611      * Called after {@link #onStartTemporaryDetach} when the container is done
   7612      * changing the view.
   7613      */
   7614     public void onFinishTemporaryDetach() {
   7615     }
   7616 
   7617     /**
   7618      * Return the global {@link KeyEvent.DispatcherState KeyEvent.DispatcherState}
   7619      * for this view's window.  Returns null if the view is not currently attached
   7620      * to the window.  Normally you will not need to use this directly, but
   7621      * just use the standard high-level event callbacks like
   7622      * {@link #onKeyDown(int, KeyEvent)}.
   7623      */
   7624     public KeyEvent.DispatcherState getKeyDispatcherState() {
   7625         return mAttachInfo != null ? mAttachInfo.mKeyDispatchState : null;
   7626     }
   7627 
   7628     /**
   7629      * Dispatch a key event before it is processed by any input method
   7630      * associated with the view hierarchy.  This can be used to intercept
   7631      * key events in special situations before the IME consumes them; a
   7632      * typical example would be handling the BACK key to update the application's
   7633      * UI instead of allowing the IME to see it and close itself.
   7634      *
   7635      * @param event The key event to be dispatched.
   7636      * @return True if the event was handled, false otherwise.
   7637      */
   7638     public boolean dispatchKeyEventPreIme(KeyEvent event) {
   7639         return onKeyPreIme(event.getKeyCode(), event);
   7640     }
   7641 
   7642     /**
   7643      * Dispatch a key event to the next view on the focus path. This path runs
   7644      * from the top of the view tree down to the currently focused view. If this
   7645      * view has focus, it will dispatch to itself. Otherwise it will dispatch
   7646      * the next node down the focus path. This method also fires any key
   7647      * listeners.
   7648      *
   7649      * @param event The key event to be dispatched.
   7650      * @return True if the event was handled, false otherwise.
   7651      */
   7652     public boolean dispatchKeyEvent(KeyEvent event) {
   7653         if (mInputEventConsistencyVerifier != null) {
   7654             mInputEventConsistencyVerifier.onKeyEvent(event, 0);
   7655         }
   7656 
   7657         // Give any attached key listener a first crack at the event.
   7658         //noinspection SimplifiableIfStatement
   7659         ListenerInfo li = mListenerInfo;
   7660         if (li != null && li.mOnKeyListener != null && (mViewFlags & ENABLED_MASK) == ENABLED
   7661                 && li.mOnKeyListener.onKey(this, event.getKeyCode(), event)) {
   7662             return true;
   7663         }
   7664 
   7665         if (event.dispatch(this, mAttachInfo != null
   7666                 ? mAttachInfo.mKeyDispatchState : null, this)) {
   7667             return true;
   7668         }
   7669 
   7670         if (mInputEventConsistencyVerifier != null) {
   7671             mInputEventConsistencyVerifier.onUnhandledEvent(event, 0);
   7672         }
   7673         return false;
   7674     }
   7675 
   7676     /**
   7677      * Dispatches a key shortcut event.
   7678      *
   7679      * @param event The key event to be dispatched.
   7680      * @return True if the event was handled by the view, false otherwise.
   7681      */
   7682     public boolean dispatchKeyShortcutEvent(KeyEvent event) {
   7683         return onKeyShortcut(event.getKeyCode(), event);
   7684     }
   7685 
   7686     /**
   7687      * Pass the touch screen motion event down to the target view, or this
   7688      * view if it is the target.
   7689      *
   7690      * @param event The motion event to be dispatched.
   7691      * @return True if the event was handled by the view, false otherwise.
   7692      */
   7693     public boolean dispatchTouchEvent(MotionEvent event) {
   7694         if (mInputEventConsistencyVerifier != null) {
   7695             mInputEventConsistencyVerifier.onTouchEvent(event, 0);
   7696         }
   7697 
   7698         if (onFilterTouchEventForSecurity(event)) {
   7699             //noinspection SimplifiableIfStatement
   7700             ListenerInfo li = mListenerInfo;
   7701             if (li != null && li.mOnTouchListener != null && (mViewFlags & ENABLED_MASK) == ENABLED
   7702                     && li.mOnTouchListener.onTouch(this, event)) {
   7703                 return true;
   7704             }
   7705 
   7706             if (onTouchEvent(event)) {
   7707                 return true;
   7708             }
   7709         }
   7710 
   7711         if (mInputEventConsistencyVerifier != null) {
   7712             mInputEventConsistencyVerifier.onUnhandledEvent(event, 0);
   7713         }
   7714         return false;
   7715     }
   7716 
   7717     /**
   7718      * Filter the touch event to apply security policies.
   7719      *
   7720      * @param event The motion event to be filtered.
   7721      * @return True if the event should be dispatched, false if the event should be dropped.
   7722      *
   7723      * @see #getFilterTouchesWhenObscured
   7724      */
   7725     public boolean onFilterTouchEventForSecurity(MotionEvent event) {
   7726         //noinspection RedundantIfStatement
   7727         if ((mViewFlags & FILTER_TOUCHES_WHEN_OBSCURED) != 0
   7728                 && (event.getFlags() & MotionEvent.FLAG_WINDOW_IS_OBSCURED) != 0) {
   7729             // Window is obscured, drop this touch.
   7730             return false;
   7731         }
   7732         return true;
   7733     }
   7734 
   7735     /**
   7736      * Pass a trackball motion event down to the focused view.
   7737      *
   7738      * @param event The motion event to be dispatched.
   7739      * @return True if the event was handled by the view, false otherwise.
   7740      */
   7741     public boolean dispatchTrackballEvent(MotionEvent event) {
   7742         if (mInputEventConsistencyVerifier != null) {
   7743             mInputEventConsistencyVerifier.onTrackballEvent(event, 0);
   7744         }
   7745 
   7746         return onTrackballEvent(event);
   7747     }
   7748 
   7749     /**
   7750      * Dispatch a generic motion event.
   7751      * <p>
   7752      * Generic motion events with source class {@link InputDevice#SOURCE_CLASS_POINTER}
   7753      * are delivered to the view under the pointer.  All other generic motion events are
   7754      * delivered to the focused view.  Hover events are handled specially and are delivered
   7755      * to {@link #onHoverEvent(MotionEvent)}.
   7756      * </p>
   7757      *
   7758      * @param event The motion event to be dispatched.
   7759      * @return True if the event was handled by the view, false otherwise.
   7760      */
   7761     public boolean dispatchGenericMotionEvent(MotionEvent event) {
   7762         if (mInputEventConsistencyVerifier != null) {
   7763             mInputEventConsistencyVerifier.onGenericMotionEvent(event, 0);
   7764         }
   7765 
   7766         final int source = event.getSource();
   7767         if ((source & InputDevice.SOURCE_CLASS_POINTER) != 0) {
   7768             final int action = event.getAction();
   7769             if (action == MotionEvent.ACTION_HOVER_ENTER
   7770                     || action == MotionEvent.ACTION_HOVER_MOVE
   7771                     || action == MotionEvent.ACTION_HOVER_EXIT) {
   7772                 if (dispatchHoverEvent(event)) {
   7773                     return true;
   7774                 }
   7775             } else if (dispatchGenericPointerEvent(event)) {
   7776                 return true;
   7777             }
   7778         } else if (dispatchGenericFocusedEvent(event)) {
   7779             return true;
   7780         }
   7781 
   7782         if (dispatchGenericMotionEventInternal(event)) {
   7783             return true;
   7784         }
   7785 
   7786         if (mInputEventConsistencyVerifier != null) {
   7787             mInputEventConsistencyVerifier.onUnhandledEvent(event, 0);
   7788         }
   7789         return false;
   7790     }
   7791 
   7792     private boolean dispatchGenericMotionEventInternal(MotionEvent event) {
   7793         //noinspection SimplifiableIfStatement
   7794         ListenerInfo li = mListenerInfo;
   7795         if (li != null && li.mOnGenericMotionListener != null
   7796                 && (mViewFlags & ENABLED_MASK) == ENABLED
   7797                 && li.mOnGenericMotionListener.onGenericMotion(this, event)) {
   7798             return true;
   7799         }
   7800 
   7801         if (onGenericMotionEvent(event)) {
   7802             return true;
   7803         }
   7804 
   7805         if (mInputEventConsistencyVerifier != null) {
   7806             mInputEventConsistencyVerifier.onUnhandledEvent(event, 0);
   7807         }
   7808         return false;
   7809     }
   7810 
   7811     /**
   7812      * Dispatch a hover event.
   7813      * <p>
   7814      * Do not call this method directly.
   7815      * Call {@link #dispatchGenericMotionEvent(MotionEvent)} instead.
   7816      * </p>
   7817      *
   7818      * @param event The motion event to be dispatched.
   7819      * @return True if the event was handled by the view, false otherwise.
   7820      */
   7821     protected boolean dispatchHoverEvent(MotionEvent event) {
   7822         ListenerInfo li = mListenerInfo;
   7823         //noinspection SimplifiableIfStatement
   7824         if (li != null && li.mOnHoverListener != null
   7825                 && (mViewFlags & ENABLED_MASK) == ENABLED
   7826                 && li.mOnHoverListener.onHover(this, event)) {
   7827             return true;
   7828         }
   7829 
   7830         return onHoverEvent(event);
   7831     }
   7832 
   7833     /**
   7834      * Returns true if the view has a child to which it has recently sent
   7835      * {@link MotionEvent#ACTION_HOVER_ENTER}.  If this view is hovered and
   7836      * it does not have a hovered child, then it must be the innermost hovered view.
   7837      * @hide
   7838      */
   7839     protected boolean hasHoveredChild() {
   7840         return false;
   7841     }
   7842 
   7843     /**
   7844      * Dispatch a generic motion event to the view under the first pointer.
   7845      * <p>
   7846      * Do not call this method directly.
   7847      * Call {@link #dispatchGenericMotionEvent(MotionEvent)} instead.
   7848      * </p>
   7849      *
   7850      * @param event The motion event to be dispatched.
   7851      * @return True if the event was handled by the view, false otherwise.
   7852      */
   7853     protected boolean dispatchGenericPointerEvent(MotionEvent event) {
   7854         return false;
   7855     }
   7856 
   7857     /**
   7858      * Dispatch a generic motion event to the currently focused view.
   7859      * <p>
   7860      * Do not call this method directly.
   7861      * Call {@link #dispatchGenericMotionEvent(MotionEvent)} instead.
   7862      * </p>
   7863      *
   7864      * @param event The motion event to be dispatched.
   7865      * @return True if the event was handled by the view, false otherwise.
   7866      */
   7867     protected boolean dispatchGenericFocusedEvent(MotionEvent event) {
   7868         return false;
   7869     }
   7870 
   7871     /**
   7872      * Dispatch a pointer event.
   7873      * <p>
   7874      * Dispatches touch related pointer events to {@link #onTouchEvent(MotionEvent)} and all
   7875      * other events to {@link #onGenericMotionEvent(MotionEvent)}.  This separation of concerns
   7876      * reinforces the invariant that {@link #onTouchEvent(MotionEvent)} is really about touches
   7877      * and should not be expected to handle other pointing device features.
   7878      * </p>
   7879      *
   7880      * @param event The motion event to be dispatched.
   7881      * @return True if the event was handled by the view, false otherwise.
   7882      * @hide
   7883      */
   7884     public final boolean dispatchPointerEvent(MotionEvent event) {
   7885         if (event.isTouchEvent()) {
   7886             return dispatchTouchEvent(event);
   7887         } else {
   7888             return dispatchGenericMotionEvent(event);
   7889         }
   7890     }
   7891 
   7892     /**
   7893      * Called when the window containing this view gains or loses window focus.
   7894      * ViewGroups should override to route to their children.
   7895      *
   7896      * @param hasFocus True if the window containing this view now has focus,
   7897      *        false otherwise.
   7898      */
   7899     public void dispatchWindowFocusChanged(boolean hasFocus) {
   7900         onWindowFocusChanged(hasFocus);
   7901     }
   7902 
   7903     /**
   7904      * Called when the window containing this view gains or loses focus.  Note
   7905      * that this is separate from view focus: to receive key events, both
   7906      * your view and its window must have focus.  If a window is displayed
   7907      * on top of yours that takes input focus, then your own window will lose
   7908      * focus but the view focus will remain unchanged.
   7909      *
   7910      * @param hasWindowFocus True if the window containing this view now has
   7911      *        focus, false otherwise.
   7912      */
   7913     public void onWindowFocusChanged(boolean hasWindowFocus) {
   7914         InputMethodManager imm = InputMethodManager.peekInstance();
   7915         if (!hasWindowFocus) {
   7916             if (isPressed()) {
   7917                 setPressed(false);
   7918             }
   7919             if (imm != null && (mPrivateFlags & PFLAG_FOCUSED) != 0) {
   7920                 imm.focusOut(this);
   7921             }
   7922             removeLongPressCallback();
   7923             removeTapCallback();
   7924             onFocusLost();
   7925         } else if (imm != null && (mPrivateFlags & PFLAG_FOCUSED) != 0) {
   7926             imm.focusIn(this);
   7927         }
   7928         refreshDrawableState();
   7929     }
   7930 
   7931     /**
   7932      * Returns true if this view is in a window that currently has window focus.
   7933      * Note that this is not the same as the view itself having focus.
   7934      *
   7935      * @return True if this view is in a window that currently has window focus.
   7936      */
   7937     public boolean hasWindowFocus() {
   7938         return mAttachInfo != null && mAttachInfo.mHasWindowFocus;
   7939     }
   7940 
   7941     /**
   7942      * Dispatch a view visibility change down the view hierarchy.
   7943      * ViewGroups should override to route to their children.
   7944      * @param changedView The view whose visibility changed. Could be 'this' or
   7945      * an ancestor view.
   7946      * @param visibility The new visibility of changedView: {@link #VISIBLE},
   7947      * {@link #INVISIBLE} or {@link #GONE}.
   7948      */
   7949     protected void dispatchVisibilityChanged(View changedView, int visibility) {
   7950         onVisibilityChanged(changedView, visibility);
   7951     }
   7952 
   7953     /**
   7954      * Called when the visibility of the view or an ancestor of the view is changed.
   7955      * @param changedView The view whose visibility changed. Could be 'this' or
   7956      * an ancestor view.
   7957      * @param visibility The new visibility of changedView: {@link #VISIBLE},
   7958      * {@link #INVISIBLE} or {@link #GONE}.
   7959      */
   7960     protected void onVisibilityChanged(View changedView, int visibility) {
   7961         if (visibility == VISIBLE) {
   7962             if (mAttachInfo != null) {
   7963                 initialAwakenScrollBars();
   7964             } else {
   7965                 mPrivateFlags |= PFLAG_AWAKEN_SCROLL_BARS_ON_ATTACH;
   7966             }
   7967         }
   7968     }
   7969 
   7970     /**
   7971      * Dispatch a hint about whether this view is displayed. For instance, when
   7972      * a View moves out of the screen, it might receives a display hint indicating
   7973      * the view is not displayed. Applications should not <em>rely</em> on this hint
   7974      * as there is no guarantee that they will receive one.
   7975      *
   7976      * @param hint A hint about whether or not this view is displayed:
   7977      * {@link #VISIBLE} or {@link #INVISIBLE}.
   7978      */
   7979     public void dispatchDisplayHint(int hint) {
   7980         onDisplayHint(hint);
   7981     }
   7982 
   7983     /**
   7984      * Gives this view a hint about whether is displayed or not. For instance, when
   7985      * a View moves out of the screen, it might receives a display hint indicating
   7986      * the view is not displayed. Applications should not <em>rely</em> on this hint
   7987      * as there is no guarantee that they will receive one.
   7988      *
   7989      * @param hint A hint about whether or not this view is displayed:
   7990      * {@link #VISIBLE} or {@link #INVISIBLE}.
   7991      */
   7992     protected void onDisplayHint(int hint) {
   7993     }
   7994 
   7995     /**
   7996      * Dispatch a window visibility change down the view hierarchy.
   7997      * ViewGroups should override to route to their children.
   7998      *
   7999      * @param visibility The new visibility of the window.
   8000      *
   8001      * @see #onWindowVisibilityChanged(int)
   8002      */
   8003     public void dispatchWindowVisibilityChanged(int visibility) {
   8004         onWindowVisibilityChanged(visibility);
   8005     }
   8006 
   8007     /**
   8008      * Called when the window containing has change its visibility
   8009      * (between {@link #GONE}, {@link #INVISIBLE}, and {@link #VISIBLE}).  Note
   8010      * that this tells you whether or not your window is being made visible
   8011      * to the window manager; this does <em>not</em> tell you whether or not
   8012      * your window is obscured by other windows on the screen, even if it
   8013      * is itself visible.
   8014      *
   8015      * @param visibility The new visibility of the window.
   8016      */
   8017     protected void onWindowVisibilityChanged(int visibility) {
   8018         if (visibility == VISIBLE) {
   8019             initialAwakenScrollBars();
   8020         }
   8021     }
   8022 
   8023     /**
   8024      * Returns the current visibility of the window this view is attached to
   8025      * (either {@link #GONE}, {@link #INVISIBLE}, or {@link #VISIBLE}).
   8026      *
   8027      * @return Returns the current visibility of the view's window.
   8028      */
   8029     public int getWindowVisibility() {
   8030         return mAttachInfo != null ? mAttachInfo.mWindowVisibility : GONE;
   8031     }
   8032 
   8033     /**
   8034      * Retrieve the overall visible display size in which the window this view is
   8035      * attached to has been positioned in.  This takes into account screen
   8036      * decorations above the window, for both cases where the window itself
   8037      * is being position inside of them or the window is being placed under
   8038      * then and covered insets are used for the window to position its content
   8039      * inside.  In effect, this tells you the available area where content can
   8040      * be placed and remain visible to users.
   8041      *
   8042      * <p>This function requires an IPC back to the window manager to retrieve
   8043      * the requested information, so should not be used in performance critical
   8044      * code like drawing.
   8045      *
   8046      * @param outRect Filled in with the visible display frame.  If the view
   8047      * is not attached to a window, this is simply the raw display size.
   8048      */
   8049     public void getWindowVisibleDisplayFrame(Rect outRect) {
   8050         if (mAttachInfo != null) {
   8051             try {
   8052                 mAttachInfo.mSession.getDisplayFrame(mAttachInfo.mWindow, outRect);
   8053             } catch (RemoteException e) {
   8054                 return;
   8055             }
   8056             // XXX This is really broken, and probably all needs to be done
   8057             // in the window manager, and we need to know more about whether
   8058             // we want the area behind or in front of the IME.
   8059             final Rect insets = mAttachInfo.mVisibleInsets;
   8060             outRect.left += insets.left;
   8061             outRect.top += insets.top;
   8062             outRect.right -= insets.right;
   8063             outRect.bottom -= insets.bottom;
   8064             return;
   8065         }
   8066         // The view is not attached to a display so we don't have a context.
   8067         // Make a best guess about the display size.
   8068         Display d = DisplayManagerGlobal.getInstance().getRealDisplay(Display.DEFAULT_DISPLAY);
   8069         d.getRectSize(outRect);
   8070     }
   8071 
   8072     /**
   8073      * Dispatch a notification about a resource configuration change down
   8074      * the view hierarchy.
   8075      * ViewGroups should override to route to their children.
   8076      *
   8077      * @param newConfig The new resource configuration.
   8078      *
   8079      * @see #onConfigurationChanged(android.content.res.Configuration)
   8080      */
   8081     public void dispatchConfigurationChanged(Configuration newConfig) {
   8082         onConfigurationChanged(newConfig);
   8083     }
   8084 
   8085     /**
   8086      * Called when the current configuration of the resources being used
   8087      * by the application have changed.  You can use this to decide when
   8088      * to reload resources that can changed based on orientation and other
   8089      * configuration characterstics.  You only need to use this if you are
   8090      * not relying on the normal {@link android.app.Activity} mechanism of
   8091      * recreating the activity instance upon a configuration change.
   8092      *
   8093      * @param newConfig The new resource configuration.
   8094      */
   8095     protected void onConfigurationChanged(Configuration newConfig) {
   8096     }
   8097 
   8098     /**
   8099      * Private function to aggregate all per-view attributes in to the view
   8100      * root.
   8101      */
   8102     void dispatchCollectViewAttributes(AttachInfo attachInfo, int visibility) {
   8103         performCollectViewAttributes(attachInfo, visibility);
   8104     }
   8105 
   8106     void performCollectViewAttributes(AttachInfo attachInfo, int visibility) {
   8107         if ((visibility & VISIBILITY_MASK) == VISIBLE) {
   8108             if ((mViewFlags & KEEP_SCREEN_ON) == KEEP_SCREEN_ON) {
   8109                 attachInfo.mKeepScreenOn = true;
   8110             }
   8111             attachInfo.mSystemUiVisibility |= mSystemUiVisibility;
   8112             ListenerInfo li = mListenerInfo;
   8113             if (li != null && li.mOnSystemUiVisibilityChangeListener != null) {
   8114                 attachInfo.mHasSystemUiListeners = true;
   8115             }
   8116         }
   8117     }
   8118 
   8119     void needGlobalAttributesUpdate(boolean force) {
   8120         final AttachInfo ai = mAttachInfo;
   8121         if (ai != null && !ai.mRecomputeGlobalAttributes) {
   8122             if (force || ai.mKeepScreenOn || (ai.mSystemUiVisibility != 0)
   8123                     || ai.mHasSystemUiListeners) {
   8124                 ai.mRecomputeGlobalAttributes = true;
   8125             }
   8126         }
   8127     }
   8128 
   8129     /**
   8130      * Returns whether the device is currently in touch mode.  Touch mode is entered
   8131      * once the user begins interacting with the device by touch, and affects various
   8132      * things like whether focus is always visible to the user.
   8133      *
   8134      * @return Whether the device is in touch mode.
   8135      */
   8136     @ViewDebug.ExportedProperty
   8137     public boolean isInTouchMode() {
   8138         if (mAttachInfo != null) {
   8139             return mAttachInfo.mInTouchMode;
   8140         } else {
   8141             return ViewRootImpl.isInTouchMode();
   8142         }
   8143     }
   8144 
   8145     /**
   8146      * Returns the context the view is running in, through which it can
   8147      * access the current theme, resources, etc.
   8148      *
   8149      * @return The view's Context.
   8150      */
   8151     @ViewDebug.CapturedViewProperty
   8152     public final Context getContext() {
   8153         return mContext;
   8154     }
   8155 
   8156     /**
   8157      * Handle a key event before it is processed by any input method
   8158      * associated with the view hierarchy.  This can be used to intercept
   8159      * key events in special situations before the IME consumes them; a
   8160      * typical example would be handling the BACK key to update the application's
   8161      * UI instead of allowing the IME to see it and close itself.
   8162      *
   8163      * @param keyCode The value in event.getKeyCode().
   8164      * @param event Description of the key event.
   8165      * @return If you handled the event, return true. If you want to allow the
   8166      *         event to be handled by the next receiver, return false.
   8167      */
   8168     public boolean onKeyPreIme(int keyCode, KeyEvent event) {
   8169         return false;
   8170     }
   8171 
   8172     /**
   8173      * Default implementation of {@link KeyEvent.Callback#onKeyDown(int, KeyEvent)
   8174      * KeyEvent.Callback.onKeyDown()}: perform press of the view
   8175      * when {@link KeyEvent#KEYCODE_DPAD_CENTER} or {@link KeyEvent#KEYCODE_ENTER}
   8176      * is released, if the view is enabled and clickable.
   8177      *
   8178      * <p>Key presses in software keyboards will generally NOT trigger this listener,
   8179      * although some may elect to do so in some situations. Do not rely on this to
   8180      * catch software key presses.
   8181      *
   8182      * @param keyCode A key code that represents the button pressed, from
   8183      *                {@link android.view.KeyEvent}.
   8184      * @param event   The KeyEvent object that defines the button action.
   8185      */
   8186     public boolean onKeyDown(int keyCode, KeyEvent event) {
   8187         boolean result = false;
   8188 
   8189         if (KeyEvent.isConfirmKey(keyCode)) {
   8190             if ((mViewFlags & ENABLED_MASK) == DISABLED) {
   8191                 return true;
   8192             }
   8193             // Long clickable items don't necessarily have to be clickable
   8194             if (((mViewFlags & CLICKABLE) == CLICKABLE ||
   8195                     (mViewFlags & LONG_CLICKABLE) == LONG_CLICKABLE) &&
   8196                     (event.getRepeatCount() == 0)) {
   8197                 setPressed(true);
   8198                 checkForLongClick(0);
   8199                 return true;
   8200             }
   8201         }
   8202         return result;
   8203     }
   8204 
   8205     /**
   8206      * Default implementation of {@link KeyEvent.Callback#onKeyLongPress(int, KeyEvent)
   8207      * KeyEvent.Callback.onKeyLongPress()}: always returns false (doesn't handle
   8208      * the event).
   8209      * <p>Key presses in software keyboards will generally NOT trigger this listener,
   8210      * although some may elect to do so in some situations. Do not rely on this to
   8211      * catch software key presses.
   8212      */
   8213     public boolean onKeyLongPress(int keyCode, KeyEvent event) {
   8214         return false;
   8215     }
   8216 
   8217     /**
   8218      * Default implementation of {@link KeyEvent.Callback#onKeyUp(int, KeyEvent)
   8219      * KeyEvent.Callback.onKeyUp()}: perform clicking of the view
   8220      * when {@link KeyEvent#KEYCODE_DPAD_CENTER} or
   8221      * {@link KeyEvent#KEYCODE_ENTER} is released.
   8222      * <p>Key presses in software keyboards will generally NOT trigger this listener,
   8223      * although some may elect to do so in some situations. Do not rely on this to
   8224      * catch software key presses.
   8225      *
   8226      * @param keyCode A key code that represents the button pressed, from
   8227      *                {@link android.view.KeyEvent}.
   8228      * @param event   The KeyEvent object that defines the button action.
   8229      */
   8230     public boolean onKeyUp(int keyCode, KeyEvent event) {
   8231         if (KeyEvent.isConfirmKey(keyCode)) {
   8232             if ((mViewFlags & ENABLED_MASK) == DISABLED) {
   8233                 return true;
   8234             }
   8235             if ((mViewFlags & CLICKABLE) == CLICKABLE && isPressed()) {
   8236                 setPressed(false);
   8237 
   8238                 if (!mHasPerformedLongPress) {
   8239                     // This is a tap, so remove the longpress check
   8240                     removeLongPressCallback();
   8241                     return performClick();
   8242                 }
   8243             }
   8244         }
   8245         return false;
   8246     }
   8247 
   8248     /**
   8249      * Default implementation of {@link KeyEvent.Callback#onKeyMultiple(int, int, KeyEvent)
   8250      * KeyEvent.Callback.onKeyMultiple()}: always returns false (doesn't handle
   8251      * the event).
   8252      * <p>Key presses in software keyboards will generally NOT trigger this listener,
   8253      * although some may elect to do so in some situations. Do not rely on this to
   8254      * catch software key presses.
   8255      *
   8256      * @param keyCode     A key code that represents the button pressed, from
   8257      *                    {@link android.view.KeyEvent}.
   8258      * @param repeatCount The number of times the action was made.
   8259      * @param event       The KeyEvent object that defines the button action.
   8260      */
   8261     public boolean onKeyMultiple(int keyCode, int repeatCount, KeyEvent event) {
   8262         return false;
   8263     }
   8264 
   8265     /**
   8266      * Called on the focused view when a key shortcut event is not handled.
   8267      * Override this method to implement local key shortcuts for the View.
   8268      * Key shortcuts can also be implemented by setting the
   8269      * {@link MenuItem#setShortcut(char, char) shortcut} property of menu items.
   8270      *
   8271      * @param keyCode The value in event.getKeyCode().
   8272      * @param event Description of the key event.
   8273      * @return If you handled the event, return true. If you want to allow the
   8274      *         event to be handled by the next receiver, return false.
   8275      */
   8276     public boolean onKeyShortcut(int keyCode, KeyEvent event) {
   8277         return false;
   8278     }
   8279 
   8280     /**
   8281      * Check whether the called view is a text editor, in which case it
   8282      * would make sense to automatically display a soft input window for
   8283      * it.  Subclasses should override this if they implement
   8284      * {@link #onCreateInputConnection(EditorInfo)} to return true if
   8285      * a call on that method would return a non-null InputConnection, and
   8286      * they are really a first-class editor that the user would normally
   8287      * start typing on when the go into a window containing your view.
   8288      *
   8289      * <p>The default implementation always returns false.  This does
   8290      * <em>not</em> mean that its {@link #onCreateInputConnection(EditorInfo)}
   8291      * will not be called or the user can not otherwise perform edits on your
   8292      * view; it is just a hint to the system that this is not the primary
   8293      * purpose of this view.
   8294      *
   8295      * @return Returns true if this view is a text editor, else false.
   8296      */
   8297     public boolean onCheckIsTextEditor() {
   8298         return false;
   8299     }
   8300 
   8301     /**
   8302      * Create a new InputConnection for an InputMethod to interact
   8303      * with the view.  The default implementation returns null, since it doesn't
   8304      * support input methods.  You can override this to implement such support.
   8305      * This is only needed for views that take focus and text input.
   8306      *
   8307      * <p>When implementing this, you probably also want to implement
   8308      * {@link #onCheckIsTextEditor()} to indicate you will return a
   8309      * non-null InputConnection.
   8310      *
   8311      * @param outAttrs Fill in with attribute information about the connection.
   8312      */
   8313     public InputConnection onCreateInputConnection(EditorInfo outAttrs) {
   8314         return null;
   8315     }
   8316 
   8317     /**
   8318      * Called by the {@link android.view.inputmethod.InputMethodManager}
   8319      * when a view who is not the current
   8320      * input connection target is trying to make a call on the manager.  The
   8321      * default implementation returns false; you can override this to return
   8322      * true for certain views if you are performing InputConnection proxying
   8323      * to them.
   8324      * @param view The View that is making the InputMethodManager call.
   8325      * @return Return true to allow the call, false to reject.
   8326      */
   8327     public boolean checkInputConnectionProxy(View view) {
   8328         return false;
   8329     }
   8330 
   8331     /**
   8332      * Show the context menu for this view. It is not safe to hold on to the
   8333      * menu after returning from this method.
   8334      *
   8335      * You should normally not overload this method. Overload
   8336      * {@link #onCreateContextMenu(ContextMenu)} or define an
   8337      * {@link OnCreateContextMenuListener} to add items to the context menu.
   8338      *
   8339      * @param menu The context menu to populate
   8340      */
   8341     public void createContextMenu(ContextMenu menu) {
   8342         ContextMenuInfo menuInfo = getContextMenuInfo();
   8343 
   8344         // Sets the current menu info so all items added to menu will have
   8345         // my extra info set.
   8346         ((MenuBuilder)menu).setCurrentMenuInfo(menuInfo);
   8347 
   8348         onCreateContextMenu(menu);
   8349         ListenerInfo li = mListenerInfo;
   8350         if (li != null && li.mOnCreateContextMenuListener != null) {
   8351             li.mOnCreateContextMenuListener.onCreateContextMenu(menu, this, menuInfo);
   8352         }
   8353 
   8354         // Clear the extra information so subsequent items that aren't mine don't
   8355         // have my extra info.
   8356         ((MenuBuilder)menu).setCurrentMenuInfo(null);
   8357 
   8358         if (mParent != null) {
   8359             mParent.createContextMenu(menu);
   8360         }
   8361     }
   8362 
   8363     /**
   8364      * Views should implement this if they have extra information to associate
   8365      * with the context menu. The return result is supplied as a parameter to
   8366      * the {@link OnCreateContextMenuListener#onCreateContextMenu(ContextMenu, View, ContextMenuInfo)}
   8367      * callback.
   8368      *
   8369      * @return Extra information about the item for which the context menu
   8370      *         should be shown. This information will vary across different
   8371      *         subclasses of View.
   8372      */
   8373     protected ContextMenuInfo getContextMenuInfo() {
   8374         return null;
   8375     }
   8376 
   8377     /**
   8378      * Views should implement this if the view itself is going to add items to
   8379      * the context menu.
   8380      *
   8381      * @param menu the context menu to populate
   8382      */
   8383     protected void onCreateContextMenu(ContextMenu menu) {
   8384     }
   8385 
   8386     /**
   8387      * Implement this method to handle trackball motion events.  The
   8388      * <em>relative</em> movement of the trackball since the last event
   8389      * can be retrieve with {@link MotionEvent#getX MotionEvent.getX()} and
   8390      * {@link MotionEvent#getY MotionEvent.getY()}.  These are normalized so
   8391      * that a movement of 1 corresponds to the user pressing one DPAD key (so
   8392      * they will often be fractional values, representing the more fine-grained
   8393      * movement information available from a trackball).
   8394      *
   8395      * @param event The motion event.
   8396      * @return True if the event was handled, false otherwise.
   8397      */
   8398     public boolean onTrackballEvent(MotionEvent event) {
   8399         return false;
   8400     }
   8401 
   8402     /**
   8403      * Implement this method to handle generic motion events.
   8404      * <p>
   8405      * Generic motion events describe joystick movements, mouse hovers, track pad
   8406      * touches, scroll wheel movements and other input events.  The
   8407      * {@link MotionEvent#getSource() source} of the motion event specifies
   8408      * the class of input that was received.  Implementations of this method
   8409      * must examine the bits in the source before processing the event.
   8410      * The following code example shows how this is done.
   8411      * </p><p>
   8412      * Generic motion events with source class {@link InputDevice#SOURCE_CLASS_POINTER}
   8413      * are delivered to the view under the pointer.  All other generic motion events are
   8414      * delivered to the focused view.
   8415      * </p>
   8416      * <pre> public boolean onGenericMotionEvent(MotionEvent event) {
   8417      *     if (event.isFromSource(InputDevice.SOURCE_CLASS_JOYSTICK)) {
   8418      *         if (event.getAction() == MotionEvent.ACTION_MOVE) {
   8419      *             // process the joystick movement...
   8420      *             return true;
   8421      *         }
   8422      *     }
   8423      *     if (event.isFromSource(InputDevice.SOURCE_CLASS_POINTER)) {
   8424      *         switch (event.getAction()) {
   8425      *             case MotionEvent.ACTION_HOVER_MOVE:
   8426      *                 // process the mouse hover movement...
   8427      *                 return true;
   8428      *             case MotionEvent.ACTION_SCROLL:
   8429      *                 // process the scroll wheel movement...
   8430      *                 return true;
   8431      *         }
   8432      *     }
   8433      *     return super.onGenericMotionEvent(event);
   8434      * }</pre>
   8435      *
   8436      * @param event The generic motion event being processed.
   8437      * @return True if the event was handled, false otherwise.
   8438      */
   8439     public boolean onGenericMotionEvent(MotionEvent event) {
   8440         return false;
   8441     }
   8442 
   8443     /**
   8444      * Implement this method to handle hover events.
   8445      * <p>
   8446      * This method is called whenever a pointer is hovering into, over, or out of the
   8447      * bounds of a view and the view is not currently being touched.
   8448      * Hover events are represented as pointer events with action
   8449      * {@link MotionEvent#ACTION_HOVER_ENTER}, {@link MotionEvent#ACTION_HOVER_MOVE},
   8450      * or {@link MotionEvent#ACTION_HOVER_EXIT}.
   8451      * </p>
   8452      * <ul>
   8453      * <li>The view receives a hover event with action {@link MotionEvent#ACTION_HOVER_ENTER}
   8454      * when the pointer enters the bounds of the view.</li>
   8455      * <li>The view receives a hover event with action {@link MotionEvent#ACTION_HOVER_MOVE}
   8456      * when the pointer has already entered the bounds of the view and has moved.</li>
   8457      * <li>The view receives a hover event with action {@link MotionEvent#ACTION_HOVER_EXIT}
   8458      * when the pointer has exited the bounds of the view or when the pointer is
   8459      * about to go down due to a button click, tap, or similar user action that
   8460      * causes the view to be touched.</li>
   8461      * </ul>
   8462      * <p>
   8463      * The view should implement this method to return true to indicate that it is
   8464      * handling the hover event, such as by changing its drawable state.
   8465      * </p><p>
   8466      * The default implementation calls {@link #setHovered} to update the hovered state
   8467      * of the view when a hover enter or hover exit event is received, if the view
   8468      * is enabled and is clickable.  The default implementation also sends hover
   8469      * accessibility events.
   8470      * </p>
   8471      *
   8472      * @param event The motion event that describes the hover.
   8473      * @return True if the view handled the hover event.
   8474      *
   8475      * @see #isHovered
   8476      * @see #setHovered
   8477      * @see #onHoverChanged
   8478      */
   8479     public boolean onHoverEvent(MotionEvent event) {
   8480         // The root view may receive hover (or touch) events that are outside the bounds of
   8481         // the window.  This code ensures that we only send accessibility events for
   8482         // hovers that are actually within the bounds of the root view.
   8483         final int action = event.getActionMasked();
   8484         if (!mSendingHoverAccessibilityEvents) {
   8485             if ((action == MotionEvent.ACTION_HOVER_ENTER
   8486                     || action == MotionEvent.ACTION_HOVER_MOVE)
   8487                     && !hasHoveredChild()
   8488                     && pointInView(event.getX(), event.getY())) {
   8489                 sendAccessibilityHoverEvent(AccessibilityEvent.TYPE_VIEW_HOVER_ENTER);
   8490                 mSendingHoverAccessibilityEvents = true;
   8491             }
   8492         } else {
   8493             if (action == MotionEvent.ACTION_HOVER_EXIT
   8494                     || (action == MotionEvent.ACTION_MOVE
   8495                             && !pointInView(event.getX(), event.getY()))) {
   8496                 mSendingHoverAccessibilityEvents = false;
   8497                 sendAccessibilityHoverEvent(AccessibilityEvent.TYPE_VIEW_HOVER_EXIT);
   8498                 // If the window does not have input focus we take away accessibility
   8499                 // focus as soon as the user stop hovering over the view.
   8500                 if (mAttachInfo != null && !mAttachInfo.mHasWindowFocus) {
   8501                     getViewRootImpl().setAccessibilityFocus(null, null);
   8502                 }
   8503             }
   8504         }
   8505 
   8506         if (isHoverable()) {
   8507             switch (action) {
   8508                 case MotionEvent.ACTION_HOVER_ENTER:
   8509                     setHovered(true);
   8510                     break;
   8511                 case MotionEvent.ACTION_HOVER_EXIT:
   8512                     setHovered(false);
   8513                     break;
   8514             }
   8515 
   8516             // Dispatch the event to onGenericMotionEvent before returning true.
   8517             // This is to provide compatibility with existing applications that
   8518             // handled HOVER_MOVE events in onGenericMotionEvent and that would
   8519             // break because of the new default handling for hoverable views
   8520             // in onHoverEvent.
   8521             // Note that onGenericMotionEvent will be called by default when
   8522             // onHoverEvent returns false (refer to dispatchGenericMotionEvent).
   8523             dispatchGenericMotionEventInternal(event);
   8524             // The event was already handled by calling setHovered(), so always
   8525             // return true.
   8526             return true;
   8527         }
   8528 
   8529         return false;
   8530     }
   8531 
   8532     /**
   8533      * Returns true if the view should handle {@link #onHoverEvent}
   8534      * by calling {@link #setHovered} to change its hovered state.
   8535      *
   8536      * @return True if the view is hoverable.
   8537      */
   8538     private boolean isHoverable() {
   8539         final int viewFlags = mViewFlags;
   8540         if ((viewFlags & ENABLED_MASK) == DISABLED) {
   8541             return false;
   8542         }
   8543 
   8544         return (viewFlags & CLICKABLE) == CLICKABLE
   8545                 || (viewFlags & LONG_CLICKABLE) == LONG_CLICKABLE;
   8546     }
   8547 
   8548     /**
   8549      * Returns true if the view is currently hovered.
   8550      *
   8551      * @return True if the view is currently hovered.
   8552      *
   8553      * @see #setHovered
   8554      * @see #onHoverChanged
   8555      */
   8556     @ViewDebug.ExportedProperty
   8557     public boolean isHovered() {
   8558         return (mPrivateFlags & PFLAG_HOVERED) != 0;
   8559     }
   8560 
   8561     /**
   8562      * Sets whether the view is currently hovered.
   8563      * <p>
   8564      * Calling this method also changes the drawable state of the view.  This
   8565      * enables the view to react to hover by using different drawable resources
   8566      * to change its appearance.
   8567      * </p><p>
   8568      * The {@link #onHoverChanged} method is called when the hovered state changes.
   8569      * </p>
   8570      *
   8571      * @param hovered True if the view is hovered.
   8572      *
   8573      * @see #isHovered
   8574      * @see #onHoverChanged
   8575      */
   8576     public void setHovered(boolean hovered) {
   8577         if (hovered) {
   8578             if ((mPrivateFlags & PFLAG_HOVERED) == 0) {
   8579                 mPrivateFlags |= PFLAG_HOVERED;
   8580                 refreshDrawableState();
   8581                 onHoverChanged(true);
   8582             }
   8583         } else {
   8584             if ((mPrivateFlags & PFLAG_HOVERED) != 0) {
   8585                 mPrivateFlags &= ~PFLAG_HOVERED;
   8586                 refreshDrawableState();
   8587                 onHoverChanged(false);
   8588             }
   8589         }
   8590     }
   8591 
   8592     /**
   8593      * Implement this method to handle hover state changes.
   8594      * <p>
   8595      * This method is called whenever the hover state changes as a result of a
   8596      * call to {@link #setHovered}.
   8597      * </p>
   8598      *
   8599      * @param hovered The current hover state, as returned by {@link #isHovered}.
   8600      *
   8601      * @see #isHovered
   8602      * @see #setHovered
   8603      */
   8604     public void onHoverChanged(boolean hovered) {
   8605     }
   8606 
   8607     /**
   8608      * Implement this method to handle touch screen motion events.
   8609      * <p>
   8610      * If this method is used to detect click actions, it is recommended that
   8611      * the actions be performed by implementing and calling
   8612      * {@link #performClick()}. This will ensure consistent system behavior,
   8613      * including:
   8614      * <ul>
   8615      * <li>obeying click sound preferences
   8616      * <li>dispatching OnClickListener calls
   8617      * <li>handling {@link AccessibilityNodeInfo#ACTION_CLICK ACTION_CLICK} when
   8618      * accessibility features are enabled
   8619      * </ul>
   8620      *
   8621      * @param event The motion event.
   8622      * @return True if the event was handled, false otherwise.
   8623      */
   8624     public boolean onTouchEvent(MotionEvent event) {
   8625         final int viewFlags = mViewFlags;
   8626 
   8627         if ((viewFlags & ENABLED_MASK) == DISABLED) {
   8628             if (event.getAction() == MotionEvent.ACTION_UP && (mPrivateFlags & PFLAG_PRESSED) != 0) {
   8629                 setPressed(false);
   8630             }
   8631             // A disabled view that is clickable still consumes the touch
   8632             // events, it just doesn't respond to them.
   8633             return (((viewFlags & CLICKABLE) == CLICKABLE ||
   8634                     (viewFlags & LONG_CLICKABLE) == LONG_CLICKABLE));
   8635         }
   8636 
   8637         if (mTouchDelegate != null) {
   8638             if (mTouchDelegate.onTouchEvent(event)) {
   8639                 return true;
   8640             }
   8641         }
   8642 
   8643         if (((viewFlags & CLICKABLE) == CLICKABLE ||
   8644                 (viewFlags & LONG_CLICKABLE) == LONG_CLICKABLE)) {
   8645             switch (event.getAction()) {
   8646                 case MotionEvent.ACTION_UP:
   8647                     boolean prepressed = (mPrivateFlags & PFLAG_PREPRESSED) != 0;
   8648                     if ((mPrivateFlags & PFLAG_PRESSED) != 0 || prepressed) {
   8649                         // take focus if we don't have it already and we should in
   8650                         // touch mode.
   8651                         boolean focusTaken = false;
   8652                         if (isFocusable() && isFocusableInTouchMode() && !isFocused()) {
   8653                             focusTaken = requestFocus();
   8654                         }
   8655 
   8656                         if (prepressed) {
   8657                             // The button is being released before we actually
   8658                             // showed it as pressed.  Make it show the pressed
   8659                             // state now (before scheduling the click) to ensure
   8660                             // the user sees it.
   8661                             setPressed(true);
   8662                        }
   8663 
   8664                         if (!mHasPerformedLongPress) {
   8665                             // This is a tap, so remove the longpress check
   8666                             removeLongPressCallback();
   8667 
   8668                             // Only perform take click actions if we were in the pressed state
   8669                             if (!focusTaken) {
   8670                                 // Use a Runnable and post this rather than calling
   8671                                 // performClick directly. This lets other visual state
   8672                                 // of the view update before click actions start.
   8673                                 if (mPerformClick == null) {
   8674                                     mPerformClick = new PerformClick();
   8675                                 }
   8676                                 if (!post(mPerformClick)) {
   8677                                     performClick();
   8678                                 }
   8679                             }
   8680                         }
   8681 
   8682                         if (mUnsetPressedState == null) {
   8683                             mUnsetPressedState = new UnsetPressedState();
   8684                         }
   8685 
   8686                         if (prepressed) {
   8687                             postDelayed(mUnsetPressedState,
   8688                                     ViewConfiguration.getPressedStateDuration());
   8689                         } else if (!post(mUnsetPressedState)) {
   8690                             // If the post failed, unpress right now
   8691                             mUnsetPressedState.run();
   8692                         }
   8693                         removeTapCallback();
   8694                     }
   8695                     break;
   8696 
   8697                 case MotionEvent.ACTION_DOWN:
   8698                     mHasPerformedLongPress = false;
   8699 
   8700                     if (performButtonActionOnTouchDown(event)) {
   8701                         break;
   8702                     }
   8703 
   8704                     // Walk up the hierarchy to determine if we're inside a scrolling container.
   8705                     boolean isInScrollingContainer = isInScrollingContainer();
   8706 
   8707                     // For views inside a scrolling container, delay the pressed feedback for
   8708                     // a short period in case this is a scroll.
   8709                     if (isInScrollingContainer) {
   8710                         mPrivateFlags |= PFLAG_PREPRESSED;
   8711                         if (mPendingCheckForTap == null) {
   8712                             mPendingCheckForTap = new CheckForTap();
   8713                         }
   8714                         postDelayed(mPendingCheckForTap, ViewConfiguration.getTapTimeout());
   8715                     } else {
   8716                         // Not inside a scrolling container, so show the feedback right away
   8717                         setPressed(true);
   8718                         checkForLongClick(0);
   8719                     }
   8720                     break;
   8721 
   8722                 case MotionEvent.ACTION_CANCEL:
   8723                     setPressed(false);
   8724                     removeTapCallback();
   8725                     removeLongPressCallback();
   8726                     break;
   8727 
   8728                 case MotionEvent.ACTION_MOVE:
   8729                     final int x = (int) event.getX();
   8730                     final int y = (int) event.getY();
   8731 
   8732                     // Be lenient about moving outside of buttons
   8733                     if (!pointInView(x, y, mTouchSlop)) {
   8734                         // Outside button
   8735                         removeTapCallback();
   8736                         if ((mPrivateFlags & PFLAG_PRESSED) != 0) {
   8737                             // Remove any future long press/tap checks
   8738                             removeLongPressCallback();
   8739 
   8740                             setPressed(false);
   8741                         }
   8742                     }
   8743                     break;
   8744             }
   8745             return true;
   8746         }
   8747 
   8748         return false;
   8749     }
   8750 
   8751     /**
   8752      * @hide
   8753      */
   8754     public boolean isInScrollingContainer() {
   8755         ViewParent p = getParent();
   8756         while (p != null && p instanceof ViewGroup) {
   8757             if (((ViewGroup) p).shouldDelayChildPressedState()) {
   8758                 return true;
   8759             }
   8760             p = p.getParent();
   8761         }
   8762         return false;
   8763     }
   8764 
   8765     /**
   8766      * Remove the longpress detection timer.
   8767      */
   8768     private void removeLongPressCallback() {
   8769         if (mPendingCheckForLongPress != null) {
   8770           removeCallbacks(mPendingCheckForLongPress);
   8771         }
   8772     }
   8773 
   8774     /**
   8775      * Remove the pending click action
   8776      */
   8777     private void removePerformClickCallback() {
   8778         if (mPerformClick != null) {
   8779             removeCallbacks(mPerformClick);
   8780         }
   8781     }
   8782 
   8783     /**
   8784      * Remove the prepress detection timer.
   8785      */
   8786     private void removeUnsetPressCallback() {
   8787         if ((mPrivateFlags & PFLAG_PRESSED) != 0 && mUnsetPressedState != null) {
   8788             setPressed(false);
   8789             removeCallbacks(mUnsetPressedState);
   8790         }
   8791     }
   8792 
   8793     /**
   8794      * Remove the tap detection timer.
   8795      */
   8796     private void removeTapCallback() {
   8797         if (mPendingCheckForTap != null) {
   8798             mPrivateFlags &= ~PFLAG_PREPRESSED;
   8799             removeCallbacks(mPendingCheckForTap);
   8800         }
   8801     }
   8802 
   8803     /**
   8804      * Cancels a pending long press.  Your subclass can use this if you
   8805      * want the context menu to come up if the user presses and holds
   8806      * at the same place, but you don't want it to come up if they press
   8807      * and then move around enough to cause scrolling.
   8808      */
   8809     public void cancelLongPress() {
   8810         removeLongPressCallback();
   8811 
   8812         /*
   8813          * The prepressed state handled by the tap callback is a display
   8814          * construct, but the tap callback will post a long press callback
   8815          * less its own timeout. Remove it here.
   8816          */
   8817         removeTapCallback();
   8818     }
   8819 
   8820     /**
   8821      * Remove the pending callback for sending a
   8822      * {@link AccessibilityEvent#TYPE_VIEW_SCROLLED} accessibility event.
   8823      */
   8824     private void removeSendViewScrolledAccessibilityEventCallback() {
   8825         if (mSendViewScrolledAccessibilityEvent != null) {
   8826             removeCallbacks(mSendViewScrolledAccessibilityEvent);
   8827             mSendViewScrolledAccessibilityEvent.mIsPending = false;
   8828         }
   8829     }
   8830 
   8831     /**
   8832      * Sets the TouchDelegate for this View.
   8833      */
   8834     public void setTouchDelegate(TouchDelegate delegate) {
   8835         mTouchDelegate = delegate;
   8836     }
   8837 
   8838     /**
   8839      * Gets the TouchDelegate for this View.
   8840      */
   8841     public TouchDelegate getTouchDelegate() {
   8842         return mTouchDelegate;
   8843     }
   8844 
   8845     /**
   8846      * Set flags controlling behavior of this view.
   8847      *
   8848      * @param flags Constant indicating the value which should be set
   8849      * @param mask Constant indicating the bit range that should be changed
   8850      */
   8851     void setFlags(int flags, int mask) {
   8852         final boolean accessibilityEnabled =
   8853                 AccessibilityManager.getInstance(mContext).isEnabled();
   8854         final boolean oldIncludeForAccessibility = accessibilityEnabled && includeForAccessibility();
   8855 
   8856         int old = mViewFlags;
   8857         mViewFlags = (mViewFlags & ~mask) | (flags & mask);
   8858 
   8859         int changed = mViewFlags ^ old;
   8860         if (changed == 0) {
   8861             return;
   8862         }
   8863         int privateFlags = mPrivateFlags;
   8864 
   8865         /* Check if the FOCUSABLE bit has changed */
   8866         if (((changed & FOCUSABLE_MASK) != 0) &&
   8867                 ((privateFlags & PFLAG_HAS_BOUNDS) !=0)) {
   8868             if (((old & FOCUSABLE_MASK) == FOCUSABLE)
   8869                     && ((privateFlags & PFLAG_FOCUSED) != 0)) {
   8870                 /* Give up focus if we are no longer focusable */
   8871                 clearFocus();
   8872             } else if (((old & FOCUSABLE_MASK) == NOT_FOCUSABLE)
   8873                     && ((privateFlags & PFLAG_FOCUSED) == 0)) {
   8874                 /*
   8875                  * Tell the view system that we are now available to take focus
   8876                  * if no one else already has it.
   8877                  */
   8878                 if (mParent != null) mParent.focusableViewAvailable(this);
   8879             }
   8880         }
   8881 
   8882         final int newVisibility = flags & VISIBILITY_MASK;
   8883         if (newVisibility == VISIBLE) {
   8884             if ((changed & VISIBILITY_MASK) != 0) {
   8885                 /*
   8886                  * If this view is becoming visible, invalidate it in case it changed while
   8887                  * it was not visible. Marking it drawn ensures that the invalidation will
   8888                  * go through.
   8889                  */
   8890                 mPrivateFlags |= PFLAG_DRAWN;
   8891                 invalidate(true);
   8892 
   8893                 needGlobalAttributesUpdate(true);
   8894 
   8895                 // a view becoming visible is worth notifying the parent
   8896                 // about in case nothing has focus.  even if this specific view
   8897                 // isn't focusable, it may contain something that is, so let
   8898                 // the root view try to give this focus if nothing else does.
   8899                 if ((mParent != null) && (mBottom > mTop) && (mRight > mLeft)) {
   8900                     mParent.focusableViewAvailable(this);
   8901                 }
   8902             }
   8903         }
   8904 
   8905         /* Check if the GONE bit has changed */
   8906         if ((changed & GONE) != 0) {
   8907             needGlobalAttributesUpdate(false);
   8908             requestLayout();
   8909 
   8910             if (((mViewFlags & VISIBILITY_MASK) == GONE)) {
   8911                 if (hasFocus()) clearFocus();
   8912                 clearAccessibilityFocus();
   8913                 destroyDrawingCache();
   8914                 if (mParent instanceof View) {
   8915                     // GONE views noop invalidation, so invalidate the parent
   8916                     ((View) mParent).invalidate(true);
   8917                 }
   8918                 // Mark the view drawn to ensure that it gets invalidated properly the next
   8919                 // time it is visible and gets invalidated
   8920                 mPrivateFlags |= PFLAG_DRAWN;
   8921             }
   8922             if (mAttachInfo != null) {
   8923                 mAttachInfo.mViewVisibilityChanged = true;
   8924             }
   8925         }
   8926 
   8927         /* Check if the VISIBLE bit has changed */
   8928         if ((changed & INVISIBLE) != 0) {
   8929             needGlobalAttributesUpdate(false);
   8930             /*
   8931              * If this view is becoming invisible, set the DRAWN flag so that
   8932              * the next invalidate() will not be skipped.
   8933              */
   8934             mPrivateFlags |= PFLAG_DRAWN;
   8935 
   8936             if (((mViewFlags & VISIBILITY_MASK) == INVISIBLE)) {
   8937                 // root view becoming invisible shouldn't clear focus and accessibility focus
   8938                 if (getRootView() != this) {
   8939                     if (hasFocus()) clearFocus();
   8940                     clearAccessibilityFocus();
   8941                 }
   8942             }
   8943             if (mAttachInfo != null) {
   8944                 mAttachInfo.mViewVisibilityChanged = true;
   8945             }
   8946         }
   8947 
   8948         if ((changed & VISIBILITY_MASK) != 0) {
   8949             // If the view is invisible, cleanup its display list to free up resources
   8950             if (newVisibility != VISIBLE) {
   8951                 cleanupDraw();
   8952             }
   8953 
   8954             if (mParent instanceof ViewGroup) {
   8955                 ((ViewGroup) mParent).onChildVisibilityChanged(this,
   8956                         (changed & VISIBILITY_MASK), newVisibility);
   8957                 ((View) mParent).invalidate(true);
   8958             } else if (mParent != null) {
   8959                 mParent.invalidateChild(this, null);
   8960             }
   8961             dispatchVisibilityChanged(this, newVisibility);
   8962         }
   8963 
   8964         if ((changed & WILL_NOT_CACHE_DRAWING) != 0) {
   8965             destroyDrawingCache();
   8966         }
   8967 
   8968         if ((changed & DRAWING_CACHE_ENABLED) != 0) {
   8969             destroyDrawingCache();
   8970             mPrivateFlags &= ~PFLAG_DRAWING_CACHE_VALID;
   8971             invalidateParentCaches();
   8972         }
   8973 
   8974         if ((changed & DRAWING_CACHE_QUALITY_MASK) != 0) {
   8975             destroyDrawingCache();
   8976             mPrivateFlags &= ~PFLAG_DRAWING_CACHE_VALID;
   8977         }
   8978 
   8979         if ((changed & DRAW_MASK) != 0) {
   8980             if ((mViewFlags & WILL_NOT_DRAW) != 0) {
   8981                 if (mBackground != null) {
   8982                     mPrivateFlags &= ~PFLAG_SKIP_DRAW;
   8983                     mPrivateFlags |= PFLAG_ONLY_DRAWS_BACKGROUND;
   8984                 } else {
   8985                     mPrivateFlags |= PFLAG_SKIP_DRAW;
   8986                 }
   8987             } else {
   8988                 mPrivateFlags &= ~PFLAG_SKIP_DRAW;
   8989             }
   8990             requestLayout();
   8991             invalidate(true);
   8992         }
   8993 
   8994         if ((changed & KEEP_SCREEN_ON) != 0) {
   8995             if (mParent != null && mAttachInfo != null && !mAttachInfo.mRecomputeGlobalAttributes) {
   8996                 mParent.recomputeViewAttributes(this);
   8997             }
   8998         }
   8999 
   9000         if (accessibilityEnabled) {
   9001             if ((changed & FOCUSABLE_MASK) != 0 || (changed & VISIBILITY_MASK) != 0
   9002                     || (changed & CLICKABLE) != 0 || (changed & LONG_CLICKABLE) != 0) {
   9003                 if (oldIncludeForAccessibility != includeForAccessibility()) {
   9004                     notifySubtreeAccessibilityStateChangedIfNeeded();
   9005                 } else {
   9006                     notifyViewAccessibilityStateChangedIfNeeded(
   9007                             AccessibilityEvent.CONTENT_CHANGE_TYPE_UNDEFINED);
   9008                 }
   9009             } else if ((changed & ENABLED_MASK) != 0) {
   9010                 notifyViewAccessibilityStateChangedIfNeeded(
   9011                         AccessibilityEvent.CONTENT_CHANGE_TYPE_UNDEFINED);
   9012             }
   9013         }
   9014     }
   9015 
   9016     /**
   9017      * Change the view's z order in the tree, so it's on top of other sibling
   9018      * views. This ordering change may affect layout, if the parent container
   9019      * uses an order-dependent layout scheme (e.g., LinearLayout). Prior
   9020      * to {@link android.os.Build.VERSION_CODES#KITKAT} this
   9021      * method should be followed by calls to {@link #requestLayout()} and
   9022      * {@link View#invalidate()} on the view's parent to force the parent to redraw
   9023      * with the new child ordering.
   9024      *
   9025      * @see ViewGroup#bringChildToFront(View)
   9026      */
   9027     public void bringToFront() {
   9028         if (mParent != null) {
   9029             mParent.bringChildToFront(this);
   9030         }
   9031     }
   9032 
   9033     /**
   9034      * This is called in response to an internal scroll in this view (i.e., the
   9035      * view scrolled its own contents). This is typically as a result of
   9036      * {@link #scrollBy(int, int)} or {@link #scrollTo(int, int)} having been
   9037      * called.
   9038      *
   9039      * @param l Current horizontal scroll origin.
   9040      * @param t Current vertical scroll origin.
   9041      * @param oldl Previous horizontal scroll origin.
   9042      * @param oldt Previous vertical scroll origin.
   9043      */
   9044     protected void onScrollChanged(int l, int t, int oldl, int oldt) {
   9045         if (AccessibilityManager.getInstance(mContext).isEnabled()) {
   9046             postSendViewScrolledAccessibilityEventCallback();
   9047         }
   9048 
   9049         mBackgroundSizeChanged = true;
   9050 
   9051         final AttachInfo ai = mAttachInfo;
   9052         if (ai != null) {
   9053             ai.mViewScrollChanged = true;
   9054         }
   9055     }
   9056 
   9057     /**
   9058      * Interface definition for a callback to be invoked when the layout bounds of a view
   9059      * changes due to layout processing.
   9060      */
   9061     public interface OnLayoutChangeListener {
   9062         /**
   9063          * Called when the focus state of a view has changed.
   9064          *
   9065          * @param v The view whose state has changed.
   9066          * @param left The new value of the view's left property.
   9067          * @param top The new value of the view's top property.
   9068          * @param right The new value of the view's right property.
   9069          * @param bottom The new value of the view's bottom property.
   9070          * @param oldLeft The previous value of the view's left property.
   9071          * @param oldTop The previous value of the view's top property.
   9072          * @param oldRight The previous value of the view's right property.
   9073          * @param oldBottom The previous value of the view's bottom property.
   9074          */
   9075         void onLayoutChange(View v, int left, int top, int right, int bottom,
   9076             int oldLeft, int oldTop, int oldRight, int oldBottom);
   9077     }
   9078 
   9079     /**
   9080      * This is called during layout when the size of this view has changed. If
   9081      * you were just added to the view hierarchy, you're called with the old
   9082      * values of 0.
   9083      *
   9084      * @param w Current width of this view.
   9085      * @param h Current height of this view.
   9086      * @param oldw Old width of this view.
   9087      * @param oldh Old height of this view.
   9088      */
   9089     protected void onSizeChanged(int w, int h, int oldw, int oldh) {
   9090     }
   9091 
   9092     /**
   9093      * Called by draw to draw the child views. This may be overridden
   9094      * by derived classes to gain control just before its children are drawn
   9095      * (but after its own view has been drawn).
   9096      * @param canvas the canvas on which to draw the view
   9097      */
   9098     protected void dispatchDraw(Canvas canvas) {
   9099 
   9100     }
   9101 
   9102     /**
   9103      * Gets the parent of this view. Note that the parent is a
   9104      * ViewParent and not necessarily a View.
   9105      *
   9106      * @return Parent of this view.
   9107      */
   9108     public final ViewParent getParent() {
   9109         return mParent;
   9110     }
   9111 
   9112     /**
   9113      * Set the horizontal scrolled position of your view. This will cause a call to
   9114      * {@link #onScrollChanged(int, int, int, int)} and the view will be
   9115      * invalidated.
   9116      * @param value the x position to scroll to
   9117      */
   9118     public void setScrollX(int value) {
   9119         scrollTo(value, mScrollY);
   9120     }
   9121 
   9122     /**
   9123      * Set the vertical scrolled position of your view. This will cause a call to
   9124      * {@link #onScrollChanged(int, int, int, int)} and the view will be
   9125      * invalidated.
   9126      * @param value the y position to scroll to
   9127      */
   9128     public void setScrollY(int value) {
   9129         scrollTo(mScrollX, value);
   9130     }
   9131 
   9132     /**
   9133      * Return the scrolled left position of this view. This is the left edge of
   9134      * the displayed part of your view. You do not need to draw any pixels
   9135      * farther left, since those are outside of the frame of your view on
   9136      * screen.
   9137      *
   9138      * @return The left edge of the displayed part of your view, in pixels.
   9139      */
   9140     public final int getScrollX() {
   9141         return mScrollX;
   9142     }
   9143 
   9144     /**
   9145      * Return the scrolled top position of this view. This is the top edge of
   9146      * the displayed part of your view. You do not need to draw any pixels above
   9147      * it, since those are outside of the frame of your view on screen.
   9148      *
   9149      * @return The top edge of the displayed part of your view, in pixels.
   9150      */
   9151     public final int getScrollY() {
   9152         return mScrollY;
   9153     }
   9154 
   9155     /**
   9156      * Return the width of the your view.
   9157      *
   9158      * @return The width of your view, in pixels.
   9159      */
   9160     @ViewDebug.ExportedProperty(category = "layout")
   9161     public final int getWidth() {
   9162         return mRight - mLeft;
   9163     }
   9164 
   9165     /**
   9166      * Return the height of your view.
   9167      *
   9168      * @return The height of your view, in pixels.
   9169      */
   9170     @ViewDebug.ExportedProperty(category = "layout")
   9171     public final int getHeight() {
   9172         return mBottom - mTop;
   9173     }
   9174 
   9175     /**
   9176      * Return the visible drawing bounds of your view. Fills in the output
   9177      * rectangle with the values from getScrollX(), getScrollY(),
   9178      * getWidth(), and getHeight(). These bounds do not account for any
   9179      * transformation properties currently set on the view, such as
   9180      * {@link #setScaleX(float)} or {@link #setRotation(float)}.
   9181      *
   9182      * @param outRect The (scrolled) drawing bounds of the view.
   9183      */
   9184     public void getDrawingRect(Rect outRect) {
   9185         outRect.left = mScrollX;
   9186         outRect.top = mScrollY;
   9187         outRect.right = mScrollX + (mRight - mLeft);
   9188         outRect.bottom = mScrollY + (mBottom - mTop);
   9189     }
   9190 
   9191     /**
   9192      * Like {@link #getMeasuredWidthAndState()}, but only returns the
   9193      * raw width component (that is the result is masked by
   9194      * {@link #MEASURED_SIZE_MASK}).
   9195      *
   9196      * @return The raw measured width of this view.
   9197      */
   9198     public final int getMeasuredWidth() {
   9199         return mMeasuredWidth & MEASURED_SIZE_MASK;
   9200     }
   9201 
   9202     /**
   9203      * Return the full width measurement information for this view as computed
   9204      * by the most recent call to {@link #measure(int, int)}.  This result is a bit mask
   9205      * as defined by {@link #MEASURED_SIZE_MASK} and {@link #MEASURED_STATE_TOO_SMALL}.
   9206      * This should be used during measurement and layout calculations only. Use
   9207      * {@link #getWidth()} to see how wide a view is after layout.
   9208      *
   9209      * @return The measured width of this view as a bit mask.
   9210      */
   9211     public final int getMeasuredWidthAndState() {
   9212         return mMeasuredWidth;
   9213     }
   9214 
   9215     /**
   9216      * Like {@link #getMeasuredHeightAndState()}, but only returns the
   9217      * raw width component (that is the result is masked by
   9218      * {@link #MEASURED_SIZE_MASK}).
   9219      *
   9220      * @return The raw measured height of this view.
   9221      */
   9222     public final int getMeasuredHeight() {
   9223         return mMeasuredHeight & MEASURED_SIZE_MASK;
   9224     }
   9225 
   9226     /**
   9227      * Return the full height measurement information for this view as computed
   9228      * by the most recent call to {@link #measure(int, int)}.  This result is a bit mask
   9229      * as defined by {@link #MEASURED_SIZE_MASK} and {@link #MEASURED_STATE_TOO_SMALL}.
   9230      * This should be used during measurement and layout calculations only. Use
   9231      * {@link #getHeight()} to see how wide a view is after layout.
   9232      *
   9233      * @return The measured width of this view as a bit mask.
   9234      */
   9235     public final int getMeasuredHeightAndState() {
   9236         return mMeasuredHeight;
   9237     }
   9238 
   9239     /**
   9240      * Return only the state bits of {@link #getMeasuredWidthAndState()}
   9241      * and {@link #getMeasuredHeightAndState()}, combined into one integer.
   9242      * The width component is in the regular bits {@link #MEASURED_STATE_MASK}
   9243      * and the height component is at the shifted bits
   9244      * {@link #MEASURED_HEIGHT_STATE_SHIFT}>>{@link #MEASURED_STATE_MASK}.
   9245      */
   9246     public final int getMeasuredState() {
   9247         return (mMeasuredWidth&MEASURED_STATE_MASK)
   9248                 | ((mMeasuredHeight>>MEASURED_HEIGHT_STATE_SHIFT)
   9249                         & (MEASURED_STATE_MASK>>MEASURED_HEIGHT_STATE_SHIFT));
   9250     }
   9251 
   9252     /**
   9253      * The transform matrix of this view, which is calculated based on the current
   9254      * roation, scale, and pivot properties.
   9255      *
   9256      * @see #getRotation()
   9257      * @see #getScaleX()
   9258      * @see #getScaleY()
   9259      * @see #getPivotX()
   9260      * @see #getPivotY()
   9261      * @return The current transform matrix for the view
   9262      */
   9263     public Matrix getMatrix() {
   9264         if (mTransformationInfo != null) {
   9265             updateMatrix();
   9266             return mTransformationInfo.mMatrix;
   9267         }
   9268         return Matrix.IDENTITY_MATRIX;
   9269     }
   9270 
   9271     /**
   9272      * Utility function to determine if the value is far enough away from zero to be
   9273      * considered non-zero.
   9274      * @param value A floating point value to check for zero-ness
   9275      * @return whether the passed-in value is far enough away from zero to be considered non-zero
   9276      */
   9277     private static boolean nonzero(float value) {
   9278         return (value < -NONZERO_EPSILON || value > NONZERO_EPSILON);
   9279     }
   9280 
   9281     /**
   9282      * Returns true if the transform matrix is the identity matrix.
   9283      * Recomputes the matrix if necessary.
   9284      *
   9285      * @return True if the transform matrix is the identity matrix, false otherwise.
   9286      */
   9287     final boolean hasIdentityMatrix() {
   9288         if (mTransformationInfo != null) {
   9289             updateMatrix();
   9290             return mTransformationInfo.mMatrixIsIdentity;
   9291         }
   9292         return true;
   9293     }
   9294 
   9295     void ensureTransformationInfo() {
   9296         if (mTransformationInfo == null) {
   9297             mTransformationInfo = new TransformationInfo();
   9298         }
   9299     }
   9300 
   9301     /**
   9302      * Recomputes the transform matrix if necessary.
   9303      */
   9304     private void updateMatrix() {
   9305         final TransformationInfo info = mTransformationInfo;
   9306         if (info == null) {
   9307             return;
   9308         }
   9309         if (info.mMatrixDirty) {
   9310             // transform-related properties have changed since the last time someone
   9311             // asked for the matrix; recalculate it with the current values
   9312 
   9313             // Figure out if we need to update the pivot point
   9314             if ((mPrivateFlags & PFLAG_PIVOT_EXPLICITLY_SET) == 0) {
   9315                 if ((mRight - mLeft) != info.mPrevWidth || (mBottom - mTop) != info.mPrevHeight) {
   9316                     info.mPrevWidth = mRight - mLeft;
   9317                     info.mPrevHeight = mBottom - mTop;
   9318                     info.mPivotX = info.mPrevWidth / 2f;
   9319                     info.mPivotY = info.mPrevHeight / 2f;
   9320                 }
   9321             }
   9322             info.mMatrix.reset();
   9323             if (!nonzero(info.mRotationX) && !nonzero(info.mRotationY)) {
   9324                 info.mMatrix.setTranslate(info.mTranslationX, info.mTranslationY);
   9325                 info.mMatrix.preRotate(info.mRotation, info.mPivotX, info.mPivotY);
   9326                 info.mMatrix.preScale(info.mScaleX, info.mScaleY, info.mPivotX, info.mPivotY);
   9327             } else {
   9328                 if (info.mCamera == null) {
   9329                     info.mCamera = new Camera();
   9330                     info.matrix3D = new Matrix();
   9331                 }
   9332                 info.mCamera.save();
   9333                 info.mMatrix.preScale(info.mScaleX, info.mScaleY, info.mPivotX, info.mPivotY);
   9334                 info.mCamera.rotate(info.mRotationX, info.mRotationY, -info.mRotation);
   9335                 info.mCamera.getMatrix(info.matrix3D);
   9336                 info.matrix3D.preTranslate(-info.mPivotX, -info.mPivotY);
   9337                 info.matrix3D.postTranslate(info.mPivotX + info.mTranslationX,
   9338                         info.mPivotY + info.mTranslationY);
   9339                 info.mMatrix.postConcat(info.matrix3D);
   9340                 info.mCamera.restore();
   9341             }
   9342             info.mMatrixDirty = false;
   9343             info.mMatrixIsIdentity = info.mMatrix.isIdentity();
   9344             info.mInverseMatrixDirty = true;
   9345         }
   9346     }
   9347 
   9348    /**
   9349      * Utility method to retrieve the inverse of the current mMatrix property.
   9350      * We cache the matrix to avoid recalculating it when transform properties
   9351      * have not changed.
   9352      *
   9353      * @return The inverse of the current matrix of this view.
   9354      */
   9355     final Matrix getInverseMatrix() {
   9356         final TransformationInfo info = mTransformationInfo;
   9357         if (info != null) {
   9358             updateMatrix();
   9359             if (info.mInverseMatrixDirty) {
   9360                 if (info.mInverseMatrix == null) {
   9361                     info.mInverseMatrix = new Matrix();
   9362                 }
   9363                 info.mMatrix.invert(info.mInverseMatrix);
   9364                 info.mInverseMatrixDirty = false;
   9365             }
   9366             return info.mInverseMatrix;
   9367         }
   9368         return Matrix.IDENTITY_MATRIX;
   9369     }
   9370 
   9371     /**
   9372      * Gets the distance along the Z axis from the camera to this view.
   9373      *
   9374      * @see #setCameraDistance(float)
   9375      *
   9376      * @return The distance along the Z axis.
   9377      */
   9378     public float getCameraDistance() {
   9379         ensureTransformationInfo();
   9380         final float dpi = mResources.getDisplayMetrics().densityDpi;
   9381         final TransformationInfo info = mTransformationInfo;
   9382         if (info.mCamera == null) {
   9383             info.mCamera = new Camera();
   9384             info.matrix3D = new Matrix();
   9385         }
   9386         return -(info.mCamera.getLocationZ() * dpi);
   9387     }
   9388 
   9389     /**
   9390      * <p>Sets the distance along the Z axis (orthogonal to the X/Y plane on which
   9391      * views are drawn) from the camera to this view. The camera's distance
   9392      * affects 3D transformations, for instance rotations around the X and Y
   9393      * axis. If the rotationX or rotationY properties are changed and this view is
   9394      * large (more than half the size of the screen), it is recommended to always
   9395      * use a camera distance that's greater than the height (X axis rotation) or
   9396      * the width (Y axis rotation) of this view.</p>
   9397      *
   9398      * <p>The distance of the camera from the view plane can have an affect on the
   9399      * perspective distortion of the view when it is rotated around the x or y axis.
   9400      * For example, a large distance will result in a large viewing angle, and there
   9401      * will not be much perspective distortion of the view as it rotates. A short
   9402      * distance may cause much more perspective distortion upon rotation, and can
   9403      * also result in some drawing artifacts if the rotated view ends up partially
   9404      * behind the camera (which is why the recommendation is to use a distance at
   9405      * least as far as the size of the view, if the view is to be rotated.)</p>
   9406      *
   9407      * <p>The distance is expressed in "depth pixels." The default distance depends
   9408      * on the screen density. For instance, on a medium density display, the
   9409      * default distance is 1280. On a high density display, the default distance
   9410      * is 1920.</p>
   9411      *
   9412      * <p>If you want to specify a distance that leads to visually consistent
   9413      * results across various densities, use the following formula:</p>
   9414      * <pre>
   9415      * float scale = context.getResources().getDisplayMetrics().density;
   9416      * view.setCameraDistance(distance * scale);
   9417      * </pre>
   9418      *
   9419      * <p>The density scale factor of a high density display is 1.5,
   9420      * and 1920 = 1280 * 1.5.</p>
   9421      *
   9422      * @param distance The distance in "depth pixels", if negative the opposite
   9423      *        value is used
   9424      *
   9425      * @see #setRotationX(float)
   9426      * @see #setRotationY(float)
   9427      */
   9428     public void setCameraDistance(float distance) {
   9429         invalidateViewProperty(true, false);
   9430 
   9431         ensureTransformationInfo();
   9432         final float dpi = mResources.getDisplayMetrics().densityDpi;
   9433         final TransformationInfo info = mTransformationInfo;
   9434         if (info.mCamera == null) {
   9435             info.mCamera = new Camera();
   9436             info.matrix3D = new Matrix();
   9437         }
   9438 
   9439         info.mCamera.setLocation(0.0f, 0.0f, -Math.abs(distance) / dpi);
   9440         info.mMatrixDirty = true;
   9441 
   9442         invalidateViewProperty(false, false);
   9443         if (mDisplayList != null) {
   9444             mDisplayList.setCameraDistance(-Math.abs(distance) / dpi);
   9445         }
   9446         if ((mPrivateFlags2 & PFLAG2_VIEW_QUICK_REJECTED) == PFLAG2_VIEW_QUICK_REJECTED) {
   9447             // View was rejected last time it was drawn by its parent; this may have changed
   9448             invalidateParentIfNeeded();
   9449         }
   9450     }
   9451 
   9452     /**
   9453      * The degrees that the view is rotated around the pivot point.
   9454      *
   9455      * @see #setRotation(float)
   9456      * @see #getPivotX()
   9457      * @see #getPivotY()
   9458      *
   9459      * @return The degrees of rotation.
   9460      */
   9461     @ViewDebug.ExportedProperty(category = "drawing")
   9462     public float getRotation() {
   9463         return mTransformationInfo != null ? mTransformationInfo.mRotation : 0;
   9464     }
   9465 
   9466     /**
   9467      * Sets the degrees that the view is rotated around the pivot point. Increasing values
   9468      * result in clockwise rotation.
   9469      *
   9470      * @param rotation The degrees of rotation.
   9471      *
   9472      * @see #getRotation()
   9473      * @see #getPivotX()
   9474      * @see #getPivotY()
   9475      * @see #setRotationX(float)
   9476      * @see #setRotationY(float)
   9477      *
   9478      * @attr ref android.R.styleable#View_rotation
   9479      */
   9480     public void setRotation(float rotation) {
   9481         ensureTransformationInfo();
   9482         final TransformationInfo info = mTransformationInfo;
   9483         if (info.mRotation != rotation) {
   9484             // Double-invalidation is necessary to capture view's old and new areas
   9485             invalidateViewProperty(true, false);
   9486             info.mRotation = rotation;
   9487             info.mMatrixDirty = true;
   9488             invalidateViewProperty(false, true);
   9489             if (mDisplayList != null) {
   9490                 mDisplayList.setRotation(rotation);
   9491             }
   9492             if ((mPrivateFlags2 & PFLAG2_VIEW_QUICK_REJECTED) == PFLAG2_VIEW_QUICK_REJECTED) {
   9493                 // View was rejected last time it was drawn by its parent; this may have changed
   9494                 invalidateParentIfNeeded();
   9495             }
   9496         }
   9497     }
   9498 
   9499     /**
   9500      * The degrees that the view is rotated around the vertical axis through the pivot point.
   9501      *
   9502      * @see #getPivotX()
   9503      * @see #getPivotY()
   9504      * @see #setRotationY(float)
   9505      *
   9506      * @return The degrees of Y rotation.
   9507      */
   9508     @ViewDebug.ExportedProperty(category = "drawing")
   9509     public float getRotationY() {
   9510         return mTransformationInfo != null ? mTransformationInfo.mRotationY : 0;
   9511     }
   9512 
   9513     /**
   9514      * Sets the degrees that the view is rotated around the vertical axis through the pivot point.
   9515      * Increasing values result in counter-clockwise rotation from the viewpoint of looking
   9516      * down the y axis.
   9517      *
   9518      * When rotating large views, it is recommended to adjust the camera distance
   9519      * accordingly. Refer to {@link #setCameraDistance(float)} for more information.
   9520      *
   9521      * @param rotationY The degrees of Y rotation.
   9522      *
   9523      * @see #getRotationY()
   9524      * @see #getPivotX()
   9525      * @see #getPivotY()
   9526      * @see #setRotation(float)
   9527      * @see #setRotationX(float)
   9528      * @see #setCameraDistance(float)
   9529      *
   9530      * @attr ref android.R.styleable#View_rotationY
   9531      */
   9532     public void setRotationY(float rotationY) {
   9533         ensureTransformationInfo();
   9534         final TransformationInfo info = mTransformationInfo;
   9535         if (info.mRotationY != rotationY) {
   9536             invalidateViewProperty(true, false);
   9537             info.mRotationY = rotationY;
   9538             info.mMatrixDirty = true;
   9539             invalidateViewProperty(false, true);
   9540             if (mDisplayList != null) {
   9541                 mDisplayList.setRotationY(rotationY);
   9542             }
   9543             if ((mPrivateFlags2 & PFLAG2_VIEW_QUICK_REJECTED) == PFLAG2_VIEW_QUICK_REJECTED) {
   9544                 // View was rejected last time it was drawn by its parent; this may have changed
   9545                 invalidateParentIfNeeded();
   9546             }
   9547         }
   9548     }
   9549 
   9550     /**
   9551      * The degrees that the view is rotated around the horizontal axis through the pivot point.
   9552      *
   9553      * @see #getPivotX()
   9554      * @see #getPivotY()
   9555      * @see #setRotationX(float)
   9556      *
   9557      * @return The degrees of X rotation.
   9558      */
   9559     @ViewDebug.ExportedProperty(category = "drawing")
   9560     public float getRotationX() {
   9561         return mTransformationInfo != null ? mTransformationInfo.mRotationX : 0;
   9562     }
   9563 
   9564     /**
   9565      * Sets the degrees that the view is rotated around the horizontal axis through the pivot point.
   9566      * Increasing values result in clockwise rotation from the viewpoint of looking down the
   9567      * x axis.
   9568      *
   9569      * When rotating large views, it is recommended to adjust the camera distance
   9570      * accordingly. Refer to {@link #setCameraDistance(float)} for more information.
   9571      *
   9572      * @param rotationX The degrees of X rotation.
   9573      *
   9574      * @see #getRotationX()
   9575      * @see #getPivotX()
   9576      * @see #getPivotY()
   9577      * @see #setRotation(float)
   9578      * @see #setRotationY(float)
   9579      * @see #setCameraDistance(float)
   9580      *
   9581      * @attr ref android.R.styleable#View_rotationX
   9582      */
   9583     public void setRotationX(float rotationX) {
   9584         ensureTransformationInfo();
   9585         final TransformationInfo info = mTransformationInfo;
   9586         if (info.mRotationX != rotationX) {
   9587             invalidateViewProperty(true, false);
   9588             info.mRotationX = rotationX;
   9589             info.mMatrixDirty = true;
   9590             invalidateViewProperty(false, true);
   9591             if (mDisplayList != null) {
   9592                 mDisplayList.setRotationX(rotationX);
   9593             }
   9594             if ((mPrivateFlags2 & PFLAG2_VIEW_QUICK_REJECTED) == PFLAG2_VIEW_QUICK_REJECTED) {
   9595                 // View was rejected last time it was drawn by its parent; this may have changed
   9596                 invalidateParentIfNeeded();
   9597             }
   9598         }
   9599     }
   9600 
   9601     /**
   9602      * The amount that the view is scaled in x around the pivot point, as a proportion of
   9603      * the view's unscaled width. A value of 1, the default, means that no scaling is applied.
   9604      *
   9605      * <p>By default, this is 1.0f.
   9606      *
   9607      * @see #getPivotX()
   9608      * @see #getPivotY()
   9609      * @return The scaling factor.
   9610      */
   9611     @ViewDebug.ExportedProperty(category = "drawing")
   9612     public float getScaleX() {
   9613         return mTransformationInfo != null ? mTransformationInfo.mScaleX : 1;
   9614     }
   9615 
   9616     /**
   9617      * Sets the amount that the view is scaled in x around the pivot point, as a proportion of
   9618      * the view's unscaled width. A value of 1 means that no scaling is applied.
   9619      *
   9620      * @param scaleX The scaling factor.
   9621      * @see #getPivotX()
   9622      * @see #getPivotY()
   9623      *
   9624      * @attr ref android.R.styleable#View_scaleX
   9625      */
   9626     public void setScaleX(float scaleX) {
   9627         ensureTransformationInfo();
   9628         final TransformationInfo info = mTransformationInfo;
   9629         if (info.mScaleX != scaleX) {
   9630             invalidateViewProperty(true, false);
   9631             info.mScaleX = scaleX;
   9632             info.mMatrixDirty = true;
   9633             invalidateViewProperty(false, true);
   9634             if (mDisplayList != null) {
   9635                 mDisplayList.setScaleX(scaleX);
   9636             }
   9637             if ((mPrivateFlags2 & PFLAG2_VIEW_QUICK_REJECTED) == PFLAG2_VIEW_QUICK_REJECTED) {
   9638                 // View was rejected last time it was drawn by its parent; this may have changed
   9639                 invalidateParentIfNeeded();
   9640             }
   9641         }
   9642     }
   9643 
   9644     /**
   9645      * The amount that the view is scaled in y around the pivot point, as a proportion of
   9646      * the view's unscaled height. A value of 1, the default, means that no scaling is applied.
   9647      *
   9648      * <p>By default, this is 1.0f.
   9649      *
   9650      * @see #getPivotX()
   9651      * @see #getPivotY()
   9652      * @return The scaling factor.
   9653      */
   9654     @ViewDebug.ExportedProperty(category = "drawing")
   9655     public float getScaleY() {
   9656         return mTransformationInfo != null ? mTransformationInfo.mScaleY : 1;
   9657     }
   9658 
   9659     /**
   9660      * Sets the amount that the view is scaled in Y around the pivot point, as a proportion of
   9661      * the view's unscaled width. A value of 1 means that no scaling is applied.
   9662      *
   9663      * @param scaleY The scaling factor.
   9664      * @see #getPivotX()
   9665      * @see #getPivotY()
   9666      *
   9667      * @attr ref android.R.styleable#View_scaleY
   9668      */
   9669     public void setScaleY(float scaleY) {
   9670         ensureTransformationInfo();
   9671         final TransformationInfo info = mTransformationInfo;
   9672         if (info.mScaleY != scaleY) {
   9673             invalidateViewProperty(true, false);
   9674             info.mScaleY = scaleY;
   9675             info.mMatrixDirty = true;
   9676             invalidateViewProperty(false, true);
   9677             if (mDisplayList != null) {
   9678                 mDisplayList.setScaleY(scaleY);
   9679             }
   9680             if ((mPrivateFlags2 & PFLAG2_VIEW_QUICK_REJECTED) == PFLAG2_VIEW_QUICK_REJECTED) {
   9681                 // View was rejected last time it was drawn by its parent; this may have changed
   9682                 invalidateParentIfNeeded();
   9683             }
   9684         }
   9685     }
   9686 
   9687     /**
   9688      * The x location of the point around which the view is {@link #setRotation(float) rotated}
   9689      * and {@link #setScaleX(float) scaled}.
   9690      *
   9691      * @see #getRotation()
   9692      * @see #getScaleX()
   9693      * @see #getScaleY()
   9694      * @see #getPivotY()
   9695      * @return The x location of the pivot point.
   9696      *
   9697      * @attr ref android.R.styleable#View_transformPivotX
   9698      */
   9699     @ViewDebug.ExportedProperty(category = "drawing")
   9700     public float getPivotX() {
   9701         return mTransformationInfo != null ? mTransformationInfo.mPivotX : 0;
   9702     }
   9703 
   9704     /**
   9705      * Sets the x location of the point around which the view is
   9706      * {@link #setRotation(float) rotated} and {@link #setScaleX(float) scaled}.
   9707      * By default, the pivot point is centered on the object.
   9708      * Setting this property disables this behavior and causes the view to use only the
   9709      * explicitly set pivotX and pivotY values.
   9710      *
   9711      * @param pivotX The x location of the pivot point.
   9712      * @see #getRotation()
   9713      * @see #getScaleX()
   9714      * @see #getScaleY()
   9715      * @see #getPivotY()
   9716      *
   9717      * @attr ref android.R.styleable#View_transformPivotX
   9718      */
   9719     public void setPivotX(float pivotX) {
   9720         ensureTransformationInfo();
   9721         final TransformationInfo info = mTransformationInfo;
   9722         boolean pivotSet = (mPrivateFlags & PFLAG_PIVOT_EXPLICITLY_SET) ==
   9723                 PFLAG_PIVOT_EXPLICITLY_SET;
   9724         if (info.mPivotX != pivotX || !pivotSet) {
   9725             mPrivateFlags |= PFLAG_PIVOT_EXPLICITLY_SET;
   9726             invalidateViewProperty(true, false);
   9727             info.mPivotX = pivotX;
   9728             info.mMatrixDirty = true;
   9729             invalidateViewProperty(false, true);
   9730             if (mDisplayList != null) {
   9731                 mDisplayList.setPivotX(pivotX);
   9732             }
   9733             if ((mPrivateFlags2 & PFLAG2_VIEW_QUICK_REJECTED) == PFLAG2_VIEW_QUICK_REJECTED) {
   9734                 // View was rejected last time it was drawn by its parent; this may have changed
   9735                 invalidateParentIfNeeded();
   9736             }
   9737         }
   9738     }
   9739 
   9740     /**
   9741      * The y location of the point around which the view is {@link #setRotation(float) rotated}
   9742      * and {@link #setScaleY(float) scaled}.
   9743      *
   9744      * @see #getRotation()
   9745      * @see #getScaleX()
   9746      * @see #getScaleY()
   9747      * @see #getPivotY()
   9748      * @return The y location of the pivot point.
   9749      *
   9750      * @attr ref android.R.styleable#View_transformPivotY
   9751      */
   9752     @ViewDebug.ExportedProperty(category = "drawing")
   9753     public float getPivotY() {
   9754         return mTransformationInfo != null ? mTransformationInfo.mPivotY : 0;
   9755     }
   9756 
   9757     /**
   9758      * Sets the y location of the point around which the view is {@link #setRotation(float) rotated}
   9759      * and {@link #setScaleY(float) scaled}. By default, the pivot point is centered on the object.
   9760      * Setting this property disables this behavior and causes the view to use only the
   9761      * explicitly set pivotX and pivotY values.
   9762      *
   9763      * @param pivotY The y location of the pivot point.
   9764      * @see #getRotation()
   9765      * @see #getScaleX()
   9766      * @see #getScaleY()
   9767      * @see #getPivotY()
   9768      *
   9769      * @attr ref android.R.styleable#View_transformPivotY
   9770      */
   9771     public void setPivotY(float pivotY) {
   9772         ensureTransformationInfo();
   9773         final TransformationInfo info = mTransformationInfo;
   9774         boolean pivotSet = (mPrivateFlags & PFLAG_PIVOT_EXPLICITLY_SET) ==
   9775                 PFLAG_PIVOT_EXPLICITLY_SET;
   9776         if (info.mPivotY != pivotY || !pivotSet) {
   9777             mPrivateFlags |= PFLAG_PIVOT_EXPLICITLY_SET;
   9778             invalidateViewProperty(true, false);
   9779             info.mPivotY = pivotY;
   9780             info.mMatrixDirty = true;
   9781             invalidateViewProperty(false, true);
   9782             if (mDisplayList != null) {
   9783                 mDisplayList.setPivotY(pivotY);
   9784             }
   9785             if ((mPrivateFlags2 & PFLAG2_VIEW_QUICK_REJECTED) == PFLAG2_VIEW_QUICK_REJECTED) {
   9786                 // View was rejected last time it was drawn by its parent; this may have changed
   9787                 invalidateParentIfNeeded();
   9788             }
   9789         }
   9790     }
   9791 
   9792     /**
   9793      * The opacity of the view. This is a value from 0 to 1, where 0 means the view is
   9794      * completely transparent and 1 means the view is completely opaque.
   9795      *
   9796      * <p>By default this is 1.0f.
   9797      * @return The opacity of the view.
   9798      */
   9799     @ViewDebug.ExportedProperty(category = "drawing")
   9800     public float getAlpha() {
   9801         return mTransformationInfo != null ? mTransformationInfo.mAlpha : 1;
   9802     }
   9803 
   9804     /**
   9805      * Returns whether this View has content which overlaps.
   9806      *
   9807      * <p>This function, intended to be overridden by specific View types, is an optimization when
   9808      * alpha is set on a view. If rendering overlaps in a view with alpha < 1, that view is drawn to
   9809      * an offscreen buffer and then composited into place, which can be expensive. If the view has
   9810      * no overlapping rendering, the view can draw each primitive with the appropriate alpha value
   9811      * directly. An example of overlapping rendering is a TextView with a background image, such as
   9812      * a Button. An example of non-overlapping rendering is a TextView with no background, or an
   9813      * ImageView with only the foreground image. The default implementation returns true; subclasses
   9814      * should override if they have cases which can be optimized.</p>
   9815      *
   9816      * <p>The current implementation of the saveLayer and saveLayerAlpha methods in {@link Canvas}
   9817      * necessitates that a View return true if it uses the methods internally without passing the
   9818      * {@link Canvas#CLIP_TO_LAYER_SAVE_FLAG}.</p>
   9819      *
   9820      * @return true if the content in this view might overlap, false otherwise.
   9821      */
   9822     public boolean hasOverlappingRendering() {
   9823         return true;
   9824     }
   9825 
   9826     /**
   9827      * <p>Sets the opacity of the view. This is a value from 0 to 1, where 0 means the view is
   9828      * completely transparent and 1 means the view is completely opaque.</p>
   9829      *
   9830      * <p> Note that setting alpha to a translucent value (0 < alpha < 1) can have significant
   9831      * performance implications, especially for large views. It is best to use the alpha property
   9832      * sparingly and transiently, as in the case of fading animations.</p>
   9833      *
   9834      * <p>For a view with a frequently changing alpha, such as during a fading animation, it is
   9835      * strongly recommended for performance reasons to either override
   9836      * {@link #hasOverlappingRendering()} to return false if appropriate, or setting a
   9837      * {@link #setLayerType(int, android.graphics.Paint) layer type} on the view.</p>
   9838      *
   9839      * <p>If this view overrides {@link #onSetAlpha(int)} to return true, then this view is
   9840      * responsible for applying the opacity itself.</p>
   9841      *
   9842      * <p>Note that if the view is backed by a
   9843      * {@link #setLayerType(int, android.graphics.Paint) layer} and is associated with a
   9844      * {@link #setLayerPaint(android.graphics.Paint) layer paint}, setting an alpha value less than
   9845      * 1.0 will supercede the alpha of the layer paint.</p>
   9846      *
   9847      * @param alpha The opacity of the view.
   9848      *
   9849      * @see #hasOverlappingRendering()
   9850      * @see #setLayerType(int, android.graphics.Paint)
   9851      *
   9852      * @attr ref android.R.styleable#View_alpha
   9853      */
   9854     public void setAlpha(float alpha) {
   9855         ensureTransformationInfo();
   9856         if (mTransformationInfo.mAlpha != alpha) {
   9857             mTransformationInfo.mAlpha = alpha;
   9858             if (onSetAlpha((int) (alpha * 255))) {
   9859                 mPrivateFlags |= PFLAG_ALPHA_SET;
   9860                 // subclass is handling alpha - don't optimize rendering cache invalidation
   9861                 invalidateParentCaches();
   9862                 invalidate(true);
   9863             } else {
   9864                 mPrivateFlags &= ~PFLAG_ALPHA_SET;
   9865                 invalidateViewProperty(true, false);
   9866                 if (mDisplayList != null) {
   9867                     mDisplayList.setAlpha(getFinalAlpha());
   9868                 }
   9869             }
   9870         }
   9871     }
   9872 
   9873     /**
   9874      * Faster version of setAlpha() which performs the same steps except there are
   9875      * no calls to invalidate(). The caller of this function should perform proper invalidation
   9876      * on the parent and this object. The return value indicates whether the subclass handles
   9877      * alpha (the return value for onSetAlpha()).
   9878      *
   9879      * @param alpha The new value for the alpha property
   9880      * @return true if the View subclass handles alpha (the return value for onSetAlpha()) and
   9881      *         the new value for the alpha property is different from the old value
   9882      */
   9883     boolean setAlphaNoInvalidation(float alpha) {
   9884         ensureTransformationInfo();
   9885         if (mTransformationInfo.mAlpha != alpha) {
   9886             mTransformationInfo.mAlpha = alpha;
   9887             boolean subclassHandlesAlpha = onSetAlpha((int) (alpha * 255));
   9888             if (subclassHandlesAlpha) {
   9889                 mPrivateFlags |= PFLAG_ALPHA_SET;
   9890                 return true;
   9891             } else {
   9892                 mPrivateFlags &= ~PFLAG_ALPHA_SET;
   9893                 if (mDisplayList != null) {
   9894                     mDisplayList.setAlpha(getFinalAlpha());
   9895                 }
   9896             }
   9897         }
   9898         return false;
   9899     }
   9900 
   9901     /**
   9902      * This property is hidden and intended only for use by the Fade transition, which
   9903      * animates it to produce a visual translucency that does not side-effect (or get
   9904      * affected by) the real alpha property. This value is composited with the other
   9905      * alpha value (and the AlphaAnimation value, when that is present) to produce
   9906      * a final visual translucency result, which is what is passed into the DisplayList.
   9907      *
   9908      * @hide
   9909      */
   9910     public void setTransitionAlpha(float alpha) {
   9911         ensureTransformationInfo();
   9912         if (mTransformationInfo.mTransitionAlpha != alpha) {
   9913             mTransformationInfo.mTransitionAlpha = alpha;
   9914             mPrivateFlags &= ~PFLAG_ALPHA_SET;
   9915             invalidateViewProperty(true, false);
   9916             if (mDisplayList != null) {
   9917                 mDisplayList.setAlpha(getFinalAlpha());
   9918             }
   9919         }
   9920     }
   9921 
   9922     /**
   9923      * Calculates the visual alpha of this view, which is a combination of the actual
   9924      * alpha value and the transitionAlpha value (if set).
   9925      */
   9926     private float getFinalAlpha() {
   9927         if (mTransformationInfo != null) {
   9928             return mTransformationInfo.mAlpha * mTransformationInfo.mTransitionAlpha;
   9929         }
   9930         return 1;
   9931     }
   9932 
   9933     /**
   9934      * This property is hidden and intended only for use by the Fade transition, which
   9935      * animates it to produce a visual translucency that does not side-effect (or get
   9936      * affected by) the real alpha property. This value is composited with the other
   9937      * alpha value (and the AlphaAnimation value, when that is present) to produce
   9938      * a final visual translucency result, which is what is passed into the DisplayList.
   9939      *
   9940      * @hide
   9941      */
   9942     public float getTransitionAlpha() {
   9943         return mTransformationInfo != null ? mTransformationInfo.mTransitionAlpha : 1;
   9944     }
   9945 
   9946     /**
   9947      * Top position of this view relative to its parent.
   9948      *
   9949      * @return The top of this view, in pixels.
   9950      */
   9951     @ViewDebug.CapturedViewProperty
   9952     public final int getTop() {
   9953         return mTop;
   9954     }
   9955 
   9956     /**
   9957      * Sets the top position of this view relative to its parent. This method is meant to be called
   9958      * by the layout system and should not generally be called otherwise, because the property
   9959      * may be changed at any time by the layout.
   9960      *
   9961      * @param top The top of this view, in pixels.
   9962      */
   9963     public final void setTop(int top) {
   9964         if (top != mTop) {
   9965             updateMatrix();
   9966             final boolean matrixIsIdentity = mTransformationInfo == null
   9967                     || mTransformationInfo.mMatrixIsIdentity;
   9968             if (matrixIsIdentity) {
   9969                 if (mAttachInfo != null) {
   9970                     int minTop;
   9971                     int yLoc;
   9972                     if (top < mTop) {
   9973                         minTop = top;
   9974                         yLoc = top - mTop;
   9975                     } else {
   9976                         minTop = mTop;
   9977                         yLoc = 0;
   9978                     }
   9979                     invalidate(0, yLoc, mRight - mLeft, mBottom - minTop);
   9980                 }
   9981             } else {
   9982                 // Double-invalidation is necessary to capture view's old and new areas
   9983                 invalidate(true);
   9984             }
   9985 
   9986             int width = mRight - mLeft;
   9987             int oldHeight = mBottom - mTop;
   9988 
   9989             mTop = top;
   9990             if (mDisplayList != null) {
   9991                 mDisplayList.setTop(mTop);
   9992             }
   9993 
   9994             sizeChange(width, mBottom - mTop, width, oldHeight);
   9995 
   9996             if (!matrixIsIdentity) {
   9997                 if ((mPrivateFlags & PFLAG_PIVOT_EXPLICITLY_SET) == 0) {
   9998                     // A change in dimension means an auto-centered pivot point changes, too
   9999                     mTransformationInfo.mMatrixDirty = true;
   10000                 }
   10001                 mPrivateFlags |= PFLAG_DRAWN; // force another invalidation with the new orientation
   10002                 invalidate(true);
   10003             }
   10004             mBackgroundSizeChanged = true;
   10005             invalidateParentIfNeeded();
   10006             if ((mPrivateFlags2 & PFLAG2_VIEW_QUICK_REJECTED) == PFLAG2_VIEW_QUICK_REJECTED) {
   10007                 // View was rejected last time it was drawn by its parent; this may have changed
   10008                 invalidateParentIfNeeded();
   10009             }
   10010         }
   10011     }
   10012 
   10013     /**
   10014      * Bottom position of this view relative to its parent.
   10015      *
   10016      * @return The bottom of this view, in pixels.
   10017      */
   10018     @ViewDebug.CapturedViewProperty
   10019     public final int getBottom() {
   10020         return mBottom;
   10021     }
   10022 
   10023     /**
   10024      * True if this view has changed since the last time being drawn.
   10025      *
   10026      * @return The dirty state of this view.
   10027      */
   10028     public boolean isDirty() {
   10029         return (mPrivateFlags & PFLAG_DIRTY_MASK) != 0;
   10030     }
   10031 
   10032     /**
   10033      * Sets the bottom position of this view relative to its parent. This method is meant to be
   10034      * called by the layout system and should not generally be called otherwise, because the
   10035      * property may be changed at any time by the layout.
   10036      *
   10037      * @param bottom The bottom of this view, in pixels.
   10038      */
   10039     public final void setBottom(int bottom) {
   10040         if (bottom != mBottom) {
   10041             updateMatrix();
   10042             final boolean matrixIsIdentity = mTransformationInfo == null
   10043                     || mTransformationInfo.mMatrixIsIdentity;
   10044             if (matrixIsIdentity) {
   10045                 if (mAttachInfo != null) {
   10046                     int maxBottom;
   10047                     if (bottom < mBottom) {
   10048                         maxBottom = mBottom;
   10049                     } else {
   10050                         maxBottom = bottom;
   10051                     }
   10052                     invalidate(0, 0, mRight - mLeft, maxBottom - mTop);
   10053                 }
   10054             } else {
   10055                 // Double-invalidation is necessary to capture view's old and new areas
   10056                 invalidate(true);
   10057             }
   10058 
   10059             int width = mRight - mLeft;
   10060             int oldHeight = mBottom - mTop;
   10061 
   10062             mBottom = bottom;
   10063             if (mDisplayList != null) {
   10064                 mDisplayList.setBottom(mBottom);
   10065             }
   10066 
   10067             sizeChange(width, mBottom - mTop, width, oldHeight);
   10068 
   10069             if (!matrixIsIdentity) {
   10070                 if ((mPrivateFlags & PFLAG_PIVOT_EXPLICITLY_SET) == 0) {
   10071                     // A change in dimension means an auto-centered pivot point changes, too
   10072                     mTransformationInfo.mMatrixDirty = true;
   10073                 }
   10074                 mPrivateFlags |= PFLAG_DRAWN; // force another invalidation with the new orientation
   10075                 invalidate(true);
   10076             }
   10077             mBackgroundSizeChanged = true;
   10078             invalidateParentIfNeeded();
   10079             if ((mPrivateFlags2 & PFLAG2_VIEW_QUICK_REJECTED) == PFLAG2_VIEW_QUICK_REJECTED) {
   10080                 // View was rejected last time it was drawn by its parent; this may have changed
   10081                 invalidateParentIfNeeded();
   10082             }
   10083         }
   10084     }
   10085 
   10086     /**
   10087      * Left position of this view relative to its parent.
   10088      *
   10089      * @return The left edge of this view, in pixels.
   10090      */
   10091     @ViewDebug.CapturedViewProperty
   10092     public final int getLeft() {
   10093         return mLeft;
   10094     }
   10095 
   10096     /**
   10097      * Sets the left position of this view relative to its parent. This method is meant to be called
   10098      * by the layout system and should not generally be called otherwise, because the property
   10099      * may be changed at any time by the layout.
   10100      *
   10101      * @param left The bottom of this view, in pixels.
   10102      */
   10103     public final void setLeft(int left) {
   10104         if (left != mLeft) {
   10105             updateMatrix();
   10106             final boolean matrixIsIdentity = mTransformationInfo == null
   10107                     || mTransformationInfo.mMatrixIsIdentity;
   10108             if (matrixIsIdentity) {
   10109                 if (mAttachInfo != null) {
   10110                     int minLeft;
   10111                     int xLoc;
   10112                     if (left < mLeft) {
   10113                         minLeft = left;
   10114                         xLoc = left - mLeft;
   10115                     } else {
   10116                         minLeft = mLeft;
   10117                         xLoc = 0;
   10118                     }
   10119                     invalidate(xLoc, 0, mRight - minLeft, mBottom - mTop);
   10120                 }
   10121             } else {
   10122                 // Double-invalidation is necessary to capture view's old and new areas
   10123                 invalidate(true);
   10124             }
   10125 
   10126             int oldWidth = mRight - mLeft;
   10127             int height = mBottom - mTop;
   10128 
   10129             mLeft = left;
   10130             if (mDisplayList != null) {
   10131                 mDisplayList.setLeft(left);
   10132             }
   10133 
   10134             sizeChange(mRight - mLeft, height, oldWidth, height);
   10135 
   10136             if (!matrixIsIdentity) {
   10137                 if ((mPrivateFlags & PFLAG_PIVOT_EXPLICITLY_SET) == 0) {
   10138                     // A change in dimension means an auto-centered pivot point changes, too
   10139                     mTransformationInfo.mMatrixDirty = true;
   10140                 }
   10141                 mPrivateFlags |= PFLAG_DRAWN; // force another invalidation with the new orientation
   10142                 invalidate(true);
   10143             }
   10144             mBackgroundSizeChanged = true;
   10145             invalidateParentIfNeeded();
   10146             if ((mPrivateFlags2 & PFLAG2_VIEW_QUICK_REJECTED) == PFLAG2_VIEW_QUICK_REJECTED) {
   10147                 // View was rejected last time it was drawn by its parent; this may have changed
   10148                 invalidateParentIfNeeded();
   10149             }
   10150         }
   10151     }
   10152 
   10153     /**
   10154      * Right position of this view relative to its parent.
   10155      *
   10156      * @return The right edge of this view, in pixels.
   10157      */
   10158     @ViewDebug.CapturedViewProperty
   10159     public final int getRight() {
   10160         return mRight;
   10161     }
   10162 
   10163     /**
   10164      * Sets the right position of this view relative to its parent. This method is meant to be called
   10165      * by the layout system and should not generally be called otherwise, because the property
   10166      * may be changed at any time by the layout.
   10167      *
   10168      * @param right The bottom of this view, in pixels.
   10169      */
   10170     public final void setRight(int right) {
   10171         if (right != mRight) {
   10172             updateMatrix();
   10173             final boolean matrixIsIdentity = mTransformationInfo == null
   10174                     || mTransformationInfo.mMatrixIsIdentity;
   10175             if (matrixIsIdentity) {
   10176                 if (mAttachInfo != null) {
   10177                     int maxRight;
   10178                     if (right < mRight) {
   10179                         maxRight = mRight;
   10180                     } else {
   10181                         maxRight = right;
   10182                     }
   10183                     invalidate(0, 0, maxRight - mLeft, mBottom - mTop);
   10184                 }
   10185             } else {
   10186                 // Double-invalidation is necessary to capture view's old and new areas
   10187                 invalidate(true);
   10188             }
   10189 
   10190             int oldWidth = mRight - mLeft;
   10191             int height = mBottom - mTop;
   10192 
   10193             mRight = right;
   10194             if (mDisplayList != null) {
   10195                 mDisplayList.setRight(mRight);
   10196             }
   10197 
   10198             sizeChange(mRight - mLeft, height, oldWidth, height);
   10199 
   10200             if (!matrixIsIdentity) {
   10201                 if ((mPrivateFlags & PFLAG_PIVOT_EXPLICITLY_SET) == 0) {
   10202                     // A change in dimension means an auto-centered pivot point changes, too
   10203                     mTransformationInfo.mMatrixDirty = true;
   10204                 }
   10205                 mPrivateFlags |= PFLAG_DRAWN; // force another invalidation with the new orientation
   10206                 invalidate(true);
   10207             }
   10208             mBackgroundSizeChanged = true;
   10209             invalidateParentIfNeeded();
   10210             if ((mPrivateFlags2 & PFLAG2_VIEW_QUICK_REJECTED) == PFLAG2_VIEW_QUICK_REJECTED) {
   10211                 // View was rejected last time it was drawn by its parent; this may have changed
   10212                 invalidateParentIfNeeded();
   10213             }
   10214         }
   10215     }
   10216 
   10217     /**
   10218      * The visual x position of this view, in pixels. This is equivalent to the
   10219      * {@link #setTranslationX(float) translationX} property plus the current
   10220      * {@link #getLeft() left} property.
   10221      *
   10222      * @return The visual x position of this view, in pixels.
   10223      */
   10224     @ViewDebug.ExportedProperty(category = "drawing")
   10225     public float getX() {
   10226         return mLeft + (mTransformationInfo != null ? mTransformationInfo.mTranslationX : 0);
   10227     }
   10228 
   10229     /**
   10230      * Sets the visual x position of this view, in pixels. This is equivalent to setting the
   10231      * {@link #setTranslationX(float) translationX} property to be the difference between
   10232      * the x value passed in and the current {@link #getLeft() left} property.
   10233      *
   10234      * @param x The visual x position of this view, in pixels.
   10235      */
   10236     public void setX(float x) {
   10237         setTranslationX(x - mLeft);
   10238     }
   10239 
   10240     /**
   10241      * The visual y position of this view, in pixels. This is equivalent to the
   10242      * {@link #setTranslationY(float) translationY} property plus the current
   10243      * {@link #getTop() top} property.
   10244      *
   10245      * @return The visual y position of this view, in pixels.
   10246      */
   10247     @ViewDebug.ExportedProperty(category = "drawing")
   10248     public float getY() {
   10249         return mTop + (mTransformationInfo != null ? mTransformationInfo.mTranslationY : 0);
   10250     }
   10251 
   10252     /**
   10253      * Sets the visual y position of this view, in pixels. This is equivalent to setting the
   10254      * {@link #setTranslationY(float) translationY} property to be the difference between
   10255      * the y value passed in and the current {@link #getTop() top} property.
   10256      *
   10257      * @param y The visual y position of this view, in pixels.
   10258      */
   10259     public void setY(float y) {
   10260         setTranslationY(y - mTop);
   10261     }
   10262 
   10263 
   10264     /**
   10265      * The horizontal location of this view relative to its {@link #getLeft() left} position.
   10266      * This position is post-layout, in addition to wherever the object's
   10267      * layout placed it.
   10268      *
   10269      * @return The horizontal position of this view relative to its left position, in pixels.
   10270      */
   10271     @ViewDebug.ExportedProperty(category = "drawing")
   10272     public float getTranslationX() {
   10273         return mTransformationInfo != null ? mTransformationInfo.mTranslationX : 0;
   10274     }
   10275 
   10276     /**
   10277      * Sets the horizontal location of this view relative to its {@link #getLeft() left} position.
   10278      * This effectively positions the object post-layout, in addition to wherever the object's
   10279      * layout placed it.
   10280      *
   10281      * @param translationX The horizontal position of this view relative to its left position,
   10282      * in pixels.
   10283      *
   10284      * @attr ref android.R.styleable#View_translationX
   10285      */
   10286     public void setTranslationX(float translationX) {
   10287         ensureTransformationInfo();
   10288         final TransformationInfo info = mTransformationInfo;
   10289         if (info.mTranslationX != translationX) {
   10290             // Double-invalidation is necessary to capture view's old and new areas
   10291             invalidateViewProperty(true, false);
   10292             info.mTranslationX = translationX;
   10293             info.mMatrixDirty = true;
   10294             invalidateViewProperty(false, true);
   10295             if (mDisplayList != null) {
   10296                 mDisplayList.setTranslationX(translationX);
   10297             }
   10298             if ((mPrivateFlags2 & PFLAG2_VIEW_QUICK_REJECTED) == PFLAG2_VIEW_QUICK_REJECTED) {
   10299                 // View was rejected last time it was drawn by its parent; this may have changed
   10300                 invalidateParentIfNeeded();
   10301             }
   10302         }
   10303     }
   10304 
   10305     /**
   10306      * The horizontal location of this view relative to its {@link #getTop() top} position.
   10307      * This position is post-layout, in addition to wherever the object's
   10308      * layout placed it.
   10309      *
   10310      * @return The vertical position of this view relative to its top position,
   10311      * in pixels.
   10312      */
   10313     @ViewDebug.ExportedProperty(category = "drawing")
   10314     public float getTranslationY() {
   10315         return mTransformationInfo != null ? mTransformationInfo.mTranslationY : 0;
   10316     }
   10317 
   10318     /**
   10319      * Sets the vertical location of this view relative to its {@link #getTop() top} position.
   10320      * This effectively positions the object post-layout, in addition to wherever the object's
   10321      * layout placed it.
   10322      *
   10323      * @param translationY The vertical position of this view relative to its top position,
   10324      * in pixels.
   10325      *
   10326      * @attr ref android.R.styleable#View_translationY
   10327      */
   10328     public void setTranslationY(float translationY) {
   10329         ensureTransformationInfo();
   10330         final TransformationInfo info = mTransformationInfo;
   10331         if (info.mTranslationY != translationY) {
   10332             invalidateViewProperty(true, false);
   10333             info.mTranslationY = translationY;
   10334             info.mMatrixDirty = true;
   10335             invalidateViewProperty(false, true);
   10336             if (mDisplayList != null) {
   10337                 mDisplayList.setTranslationY(translationY);
   10338             }
   10339             if ((mPrivateFlags2 & PFLAG2_VIEW_QUICK_REJECTED) == PFLAG2_VIEW_QUICK_REJECTED) {
   10340                 // View was rejected last time it was drawn by its parent; this may have changed
   10341                 invalidateParentIfNeeded();
   10342             }
   10343         }
   10344     }
   10345 
   10346     /**
   10347      * Hit rectangle in parent's coordinates
   10348      *
   10349      * @param outRect The hit rectangle of the view.
   10350      */
   10351     public void getHitRect(Rect outRect) {
   10352         updateMatrix();
   10353         final TransformationInfo info = mTransformationInfo;
   10354         if (info == null || info.mMatrixIsIdentity || mAttachInfo == null) {
   10355             outRect.set(mLeft, mTop, mRight, mBottom);
   10356         } else {
   10357             final RectF tmpRect = mAttachInfo.mTmpTransformRect;
   10358             tmpRect.set(0, 0, getWidth(), getHeight());
   10359             info.mMatrix.mapRect(tmpRect);
   10360             outRect.set((int) tmpRect.left + mLeft, (int) tmpRect.top + mTop,
   10361                     (int) tmpRect.right + mLeft, (int) tmpRect.bottom + mTop);
   10362         }
   10363     }
   10364 
   10365     /**
   10366      * Determines whether the given point, in local coordinates is inside the view.
   10367      */
   10368     /*package*/ final boolean pointInView(float localX, float localY) {
   10369         return localX >= 0 && localX < (mRight - mLeft)
   10370                 && localY >= 0 && localY < (mBottom - mTop);
   10371     }
   10372 
   10373     /**
   10374      * Utility method to determine whether the given point, in local coordinates,
   10375      * is inside the view, where the area of the view is expanded by the slop factor.
   10376      * This method is called while processing touch-move events to determine if the event
   10377      * is still within the view.
   10378      *
   10379      * @hide
   10380      */
   10381     public boolean pointInView(float localX, float localY, float slop) {
   10382         return localX >= -slop && localY >= -slop && localX < ((mRight - mLeft) + slop) &&
   10383                 localY < ((mBottom - mTop) + slop);
   10384     }
   10385 
   10386     /**
   10387      * When a view has focus and the user navigates away from it, the next view is searched for
   10388      * starting from the rectangle filled in by this method.
   10389      *
   10390      * By default, the rectangle is the {@link #getDrawingRect(android.graphics.Rect)})
   10391      * of the view.  However, if your view maintains some idea of internal selection,
   10392      * such as a cursor, or a selected row or column, you should override this method and
   10393      * fill in a more specific rectangle.
   10394      *
   10395      * @param r The rectangle to fill in, in this view's coordinates.
   10396      */
   10397     public void getFocusedRect(Rect r) {
   10398         getDrawingRect(r);
   10399     }
   10400 
   10401     /**
   10402      * If some part of this view is not clipped by any of its parents, then
   10403      * return that area in r in global (root) coordinates. To convert r to local
   10404      * coordinates (without taking possible View rotations into account), offset
   10405      * it by -globalOffset (e.g. r.offset(-globalOffset.x, -globalOffset.y)).
   10406      * If the view is completely clipped or translated out, return false.
   10407      *
   10408      * @param r If true is returned, r holds the global coordinates of the
   10409      *        visible portion of this view.
   10410      * @param globalOffset If true is returned, globalOffset holds the dx,dy
   10411      *        between this view and its root. globalOffet may be null.
   10412      * @return true if r is non-empty (i.e. part of the view is visible at the
   10413      *         root level.
   10414      */
   10415     public boolean getGlobalVisibleRect(Rect r, Point globalOffset) {
   10416         int width = mRight - mLeft;
   10417         int height = mBottom - mTop;
   10418         if (width > 0 && height > 0) {
   10419             r.set(0, 0, width, height);
   10420             if (globalOffset != null) {
   10421                 globalOffset.set(-mScrollX, -mScrollY);
   10422             }
   10423             return mParent == null || mParent.getChildVisibleRect(this, r, globalOffset);
   10424         }
   10425         return false;
   10426     }
   10427 
   10428     public final boolean getGlobalVisibleRect(Rect r) {
   10429         return getGlobalVisibleRect(r, null);
   10430     }
   10431 
   10432     public final boolean getLocalVisibleRect(Rect r) {
   10433         final Point offset = mAttachInfo != null ? mAttachInfo.mPoint : new Point();
   10434         if (getGlobalVisibleRect(r, offset)) {
   10435             r.offset(-offset.x, -offset.y); // make r local
   10436             return true;
   10437         }
   10438         return false;
   10439     }
   10440 
   10441     /**
   10442      * Offset this view's vertical location by the specified number of pixels.
   10443      *
   10444      * @param offset the number of pixels to offset the view by
   10445      */
   10446     public void offsetTopAndBottom(int offset) {
   10447         if (offset != 0) {
   10448             updateMatrix();
   10449             final boolean matrixIsIdentity = mTransformationInfo == null
   10450                     || mTransformationInfo.mMatrixIsIdentity;
   10451             if (matrixIsIdentity) {
   10452                 if (mDisplayList != null) {
   10453                     invalidateViewProperty(false, false);
   10454                 } else {
   10455                     final ViewParent p = mParent;
   10456                     if (p != null && mAttachInfo != null) {
   10457                         final Rect r = mAttachInfo.mTmpInvalRect;
   10458                         int minTop;
   10459                         int maxBottom;
   10460                         int yLoc;
   10461                         if (offset < 0) {
   10462                             minTop = mTop + offset;
   10463                             maxBottom = mBottom;
   10464                             yLoc = offset;
   10465                         } else {
   10466                             minTop = mTop;
   10467                             maxBottom = mBottom + offset;
   10468                             yLoc = 0;
   10469                         }
   10470                         r.set(0, yLoc, mRight - mLeft, maxBottom - minTop);
   10471                         p.invalidateChild(this, r);
   10472                     }
   10473                 }
   10474             } else {
   10475                 invalidateViewProperty(false, false);
   10476             }
   10477 
   10478             mTop += offset;
   10479             mBottom += offset;
   10480             if (mDisplayList != null) {
   10481                 mDisplayList.offsetTopAndBottom(offset);
   10482                 invalidateViewProperty(false, false);
   10483             } else {
   10484                 if (!matrixIsIdentity) {
   10485                     invalidateViewProperty(false, true);
   10486                 }
   10487                 invalidateParentIfNeeded();
   10488             }
   10489         }
   10490     }
   10491 
   10492     /**
   10493      * Offset this view's horizontal location by the specified amount of pixels.
   10494      *
   10495      * @param offset the number of pixels to offset the view by
   10496      */
   10497     public void offsetLeftAndRight(int offset) {
   10498         if (offset != 0) {
   10499             updateMatrix();
   10500             final boolean matrixIsIdentity = mTransformationInfo == null
   10501                     || mTransformationInfo.mMatrixIsIdentity;
   10502             if (matrixIsIdentity) {
   10503                 if (mDisplayList != null) {
   10504                     invalidateViewProperty(false, false);
   10505                 } else {
   10506                     final ViewParent p = mParent;
   10507                     if (p != null && mAttachInfo != null) {
   10508                         final Rect r = mAttachInfo.mTmpInvalRect;
   10509                         int minLeft;
   10510                         int maxRight;
   10511                         if (offset < 0) {
   10512                             minLeft = mLeft + offset;
   10513                             maxRight = mRight;
   10514                         } else {
   10515                             minLeft = mLeft;
   10516                             maxRight = mRight + offset;
   10517                         }
   10518                         r.set(0, 0, maxRight - minLeft, mBottom - mTop);
   10519                         p.invalidateChild(this, r);
   10520                     }
   10521                 }
   10522             } else {
   10523                 invalidateViewProperty(false, false);
   10524             }
   10525 
   10526             mLeft += offset;
   10527             mRight += offset;
   10528             if (mDisplayList != null) {
   10529                 mDisplayList.offsetLeftAndRight(offset);
   10530                 invalidateViewProperty(false, false);
   10531             } else {
   10532                 if (!matrixIsIdentity) {
   10533                     invalidateViewProperty(false, true);
   10534                 }
   10535                 invalidateParentIfNeeded();
   10536             }
   10537         }
   10538     }
   10539 
   10540     /**
   10541      * Get the LayoutParams associated with this view. All views should have
   10542      * layout parameters. These supply parameters to the <i>parent</i> of this
   10543      * view specifying how it should be arranged. There are many subclasses of
   10544      * ViewGroup.LayoutParams, and these correspond to the different subclasses
   10545      * of ViewGroup that are responsible for arranging their children.
   10546      *
   10547      * This method may return null if this View is not attached to a parent
   10548      * ViewGroup or {@link #setLayoutParams(android.view.ViewGroup.LayoutParams)}
   10549      * was not invoked successfully. When a View is attached to a parent
   10550      * ViewGroup, this method must not return null.
   10551      *
   10552      * @return The LayoutParams associated with this view, or null if no
   10553      *         parameters have been set yet
   10554      */
   10555     @ViewDebug.ExportedProperty(deepExport = true, prefix = "layout_")
   10556     public ViewGroup.LayoutParams getLayoutParams() {
   10557         return mLayoutParams;
   10558     }
   10559 
   10560     /**
   10561      * Set the layout parameters associated with this view. These supply
   10562      * parameters to the <i>parent</i> of this view specifying how it should be
   10563      * arranged. There are many subclasses of ViewGroup.LayoutParams, and these
   10564      * correspond to the different subclasses of ViewGroup that are responsible
   10565      * for arranging their children.
   10566      *
   10567      * @param params The layout parameters for this view, cannot be null
   10568      */
   10569     public void setLayoutParams(ViewGroup.LayoutParams params) {
   10570         if (params == null) {
   10571             throw new NullPointerException("Layout parameters cannot be null");
   10572         }
   10573         mLayoutParams = params;
   10574         resolveLayoutParams();
   10575         if (mParent instanceof ViewGroup) {
   10576             ((ViewGroup) mParent).onSetLayoutParams(this, params);
   10577         }
   10578         requestLayout();
   10579     }
   10580 
   10581     /**
   10582      * Resolve the layout parameters depending on the resolved layout direction
   10583      *
   10584      * @hide
   10585      */
   10586     public void resolveLayoutParams() {
   10587         if (mLayoutParams != null) {
   10588             mLayoutParams.resolveLayoutDirection(getLayoutDirection());
   10589         }
   10590     }
   10591 
   10592     /**
   10593      * Set the scrolled position of your view. This will cause a call to
   10594      * {@link #onScrollChanged(int, int, int, int)} and the view will be
   10595      * invalidated.
   10596      * @param x the x position to scroll to
   10597      * @param y the y position to scroll to
   10598      */
   10599     public void scrollTo(int x, int y) {
   10600         if (mScrollX != x || mScrollY != y) {
   10601             int oldX = mScrollX;
   10602             int oldY = mScrollY;
   10603             mScrollX = x;
   10604             mScrollY = y;
   10605             invalidateParentCaches();
   10606             onScrollChanged(mScrollX, mScrollY, oldX, oldY);
   10607             if (!awakenScrollBars()) {
   10608                 postInvalidateOnAnimation();
   10609             }
   10610         }
   10611     }
   10612 
   10613     /**
   10614      * Move the scrolled position of your view. This will cause a call to
   10615      * {@link #onScrollChanged(int, int, int, int)} and the view will be
   10616      * invalidated.
   10617      * @param x the amount of pixels to scroll by horizontally
   10618      * @param y the amount of pixels to scroll by vertically
   10619      */
   10620     public void scrollBy(int x, int y) {
   10621         scrollTo(mScrollX + x, mScrollY + y);
   10622     }
   10623 
   10624     /**
   10625      * <p>Trigger the scrollbars to draw. When invoked this method starts an
   10626      * animation to fade the scrollbars out after a default delay. If a subclass
   10627      * provides animated scrolling, the start delay should equal the duration
   10628      * of the scrolling animation.</p>
   10629      *
   10630      * <p>The animation starts only if at least one of the scrollbars is
   10631      * enabled, as specified by {@link #isHorizontalScrollBarEnabled()} and
   10632      * {@link #isVerticalScrollBarEnabled()}. When the animation is started,
   10633      * this method returns true, and false otherwise. If the animation is
   10634      * started, this method calls {@link #invalidate()}; in that case the
   10635      * caller should not call {@link #invalidate()}.</p>
   10636      *
   10637      * <p>This method should be invoked every time a subclass directly updates
   10638      * the scroll parameters.</p>
   10639      *
   10640      * <p>This method is automatically invoked by {@link #scrollBy(int, int)}
   10641      * and {@link #scrollTo(int, int)}.</p>
   10642      *
   10643      * @return true if the animation is played, false otherwise
   10644      *
   10645      * @see #awakenScrollBars(int)
   10646      * @see #scrollBy(int, int)
   10647      * @see #scrollTo(int, int)
   10648      * @see #isHorizontalScrollBarEnabled()
   10649      * @see #isVerticalScrollBarEnabled()
   10650      * @see #setHorizontalScrollBarEnabled(boolean)
   10651      * @see #setVerticalScrollBarEnabled(boolean)
   10652      */
   10653     protected boolean awakenScrollBars() {
   10654         return mScrollCache != null &&
   10655                 awakenScrollBars(mScrollCache.scrollBarDefaultDelayBeforeFade, true);
   10656     }
   10657 
   10658     /**
   10659      * Trigger the scrollbars to draw.
   10660      * This method differs from awakenScrollBars() only in its default duration.
   10661      * initialAwakenScrollBars() will show the scroll bars for longer than
   10662      * usual to give the user more of a chance to notice them.
   10663      *
   10664      * @return true if the animation is played, false otherwise.
   10665      */
   10666     private boolean initialAwakenScrollBars() {
   10667         return mScrollCache != null &&
   10668                 awakenScrollBars(mScrollCache.scrollBarDefaultDelayBeforeFade * 4, true);
   10669     }
   10670 
   10671     /**
   10672      * <p>
   10673      * Trigger the scrollbars to draw. When invoked this method starts an
   10674      * animation to fade the scrollbars out after a fixed delay. If a subclass
   10675      * provides animated scrolling, the start delay should equal the duration of
   10676      * the scrolling animation.
   10677      * </p>
   10678      *
   10679      * <p>
   10680      * The animation starts only if at least one of the scrollbars is enabled,
   10681      * as specified by {@link #isHorizontalScrollBarEnabled()} and
   10682      * {@link #isVerticalScrollBarEnabled()}. When the animation is started,
   10683      * this method returns true, and false otherwise. If the animation is
   10684      * started, this method calls {@link #invalidate()}; in that case the caller
   10685      * should not call {@link #invalidate()}.
   10686      * </p>
   10687      *
   10688      * <p>
   10689      * This method should be invoked everytime a subclass directly updates the
   10690      * scroll parameters.
   10691      * </p>
   10692      *
   10693      * @param startDelay the delay, in milliseconds, after which the animation
   10694      *        should start; when the delay is 0, the animation starts
   10695      *        immediately
   10696      * @return true if the animation is played, false otherwise
   10697      *
   10698      * @see #scrollBy(int, int)
   10699      * @see #scrollTo(int, int)
   10700      * @see #isHorizontalScrollBarEnabled()
   10701      * @see #isVerticalScrollBarEnabled()
   10702      * @see #setHorizontalScrollBarEnabled(boolean)
   10703      * @see #setVerticalScrollBarEnabled(boolean)
   10704      */
   10705     protected boolean awakenScrollBars(int startDelay) {
   10706         return awakenScrollBars(startDelay, true);
   10707     }
   10708 
   10709     /**
   10710      * <p>
   10711      * Trigger the scrollbars to draw. When invoked this method starts an
   10712      * animation to fade the scrollbars out after a fixed delay. If a subclass
   10713      * provides animated scrolling, the start delay should equal the duration of
   10714      * the scrolling animation.
   10715      * </p>
   10716      *
   10717      * <p>
   10718      * The animation starts only if at least one of the scrollbars is enabled,
   10719      * as specified by {@link #isHorizontalScrollBarEnabled()} and
   10720      * {@link #isVerticalScrollBarEnabled()}. When the animation is started,
   10721      * this method returns true, and false otherwise. If the animation is
   10722      * started, this method calls {@link #invalidate()} if the invalidate parameter
   10723      * is set to true; in that case the caller
   10724      * should not call {@link #invalidate()}.
   10725      * </p>
   10726      *
   10727      * <p>
   10728      * This method should be invoked everytime a subclass directly updates the
   10729      * scroll parameters.
   10730      * </p>
   10731      *
   10732      * @param startDelay the delay, in milliseconds, after which the animation
   10733      *        should start; when the delay is 0, the animation starts
   10734      *        immediately
   10735      *
   10736      * @param invalidate Wheter this method should call invalidate
   10737      *
   10738      * @return true if the animation is played, false otherwise
   10739      *
   10740      * @see #scrollBy(int, int)
   10741      * @see #scrollTo(int, int)
   10742      * @see #isHorizontalScrollBarEnabled()
   10743      * @see #isVerticalScrollBarEnabled()
   10744      * @see #setHorizontalScrollBarEnabled(boolean)
   10745      * @see #setVerticalScrollBarEnabled(boolean)
   10746      */
   10747     protected boolean awakenScrollBars(int startDelay, boolean invalidate) {
   10748         final ScrollabilityCache scrollCache = mScrollCache;
   10749 
   10750         if (scrollCache == null || !scrollCache.fadeScrollBars) {
   10751             return false;
   10752         }
   10753 
   10754         if (scrollCache.scrollBar == null) {
   10755             scrollCache.scrollBar = new ScrollBarDrawable();
   10756         }
   10757 
   10758         if (isHorizontalScrollBarEnabled() || isVerticalScrollBarEnabled()) {
   10759 
   10760             if (invalidate) {
   10761                 // Invalidate to show the scrollbars
   10762                 postInvalidateOnAnimation();
   10763             }
   10764 
   10765             if (scrollCache.state == ScrollabilityCache.OFF) {
   10766                 // FIXME: this is copied from WindowManagerService.
   10767                 // We should get this value from the system when it
   10768                 // is possible to do so.
   10769                 final int KEY_REPEAT_FIRST_DELAY = 750;
   10770                 startDelay = Math.max(KEY_REPEAT_FIRST_DELAY, startDelay);
   10771             }
   10772 
   10773             // Tell mScrollCache when we should start fading. This may
   10774             // extend the fade start time if one was already scheduled
   10775             long fadeStartTime = AnimationUtils.currentAnimationTimeMillis() + startDelay;
   10776             scrollCache.fadeStartTime = fadeStartTime;
   10777             scrollCache.state = ScrollabilityCache.ON;
   10778 
   10779             // Schedule our fader to run, unscheduling any old ones first
   10780             if (mAttachInfo != null) {
   10781                 mAttachInfo.mHandler.removeCallbacks(scrollCache);
   10782                 mAttachInfo.mHandler.postAtTime(scrollCache, fadeStartTime);
   10783             }
   10784 
   10785             return true;
   10786         }
   10787 
   10788         return false;
   10789     }
   10790 
   10791     /**
   10792      * Do not invalidate views which are not visible and which are not running an animation. They
   10793      * will not get drawn and they should not set dirty flags as if they will be drawn
   10794      */
   10795     private boolean skipInvalidate() {
   10796         return (mViewFlags & VISIBILITY_MASK) != VISIBLE && mCurrentAnimation == null &&
   10797                 (!(mParent instanceof ViewGroup) ||
   10798                         !((ViewGroup) mParent).isViewTransitioning(this));
   10799     }
   10800     /**
   10801      * Mark the area defined by dirty as needing to be drawn. If the view is
   10802      * visible, {@link #onDraw(android.graphics.Canvas)} will be called at some point
   10803      * in the future. This must be called from a UI thread. To call from a non-UI
   10804      * thread, call {@link #postInvalidate()}.
   10805      *
   10806      * WARNING: This method is destructive to dirty.
   10807      * @param dirty the rectangle representing the bounds of the dirty region
   10808      */
   10809     public void invalidate(Rect dirty) {
   10810         if (skipInvalidate()) {
   10811             return;
   10812         }
   10813         if ((mPrivateFlags & (PFLAG_DRAWN | PFLAG_HAS_BOUNDS)) == (PFLAG_DRAWN | PFLAG_HAS_BOUNDS) ||
   10814                 (mPrivateFlags & PFLAG_DRAWING_CACHE_VALID) == PFLAG_DRAWING_CACHE_VALID ||
   10815                 (mPrivateFlags & PFLAG_INVALIDATED) != PFLAG_INVALIDATED) {
   10816             mPrivateFlags &= ~PFLAG_DRAWING_CACHE_VALID;
   10817             mPrivateFlags |= PFLAG_INVALIDATED;
   10818             mPrivateFlags |= PFLAG_DIRTY;
   10819             final ViewParent p = mParent;
   10820             final AttachInfo ai = mAttachInfo;
   10821             //noinspection PointlessBooleanExpression,ConstantConditions
   10822             if (!HardwareRenderer.RENDER_DIRTY_REGIONS) {
   10823                 if (p != null && ai != null && ai.mHardwareAccelerated) {
   10824                     // fast-track for GL-enabled applications; just invalidate the whole hierarchy
   10825                     // with a null dirty rect, which tells the ViewAncestor to redraw everything
   10826                     p.invalidateChild(this, null);
   10827                     return;
   10828                 }
   10829             }
   10830             if (p != null && ai != null) {
   10831                 final int scrollX = mScrollX;
   10832                 final int scrollY = mScrollY;
   10833                 final Rect r = ai.mTmpInvalRect;
   10834                 r.set(dirty.left - scrollX, dirty.top - scrollY,
   10835                         dirty.right - scrollX, dirty.bottom - scrollY);
   10836                 mParent.invalidateChild(this, r);
   10837             }
   10838         }
   10839     }
   10840 
   10841     /**
   10842      * Mark the area defined by the rect (l,t,r,b) as needing to be drawn.
   10843      * The coordinates of the dirty rect are relative to the view.
   10844      * If the view is visible, {@link #onDraw(android.graphics.Canvas)}
   10845      * will be called at some point in the future. This must be called from
   10846      * a UI thread. To call from a non-UI thread, call {@link #postInvalidate()}.
   10847      * @param l the left position of the dirty region
   10848      * @param t the top position of the dirty region
   10849      * @param r the right position of the dirty region
   10850      * @param b the bottom position of the dirty region
   10851      */
   10852     public void invalidate(int l, int t, int r, int b) {
   10853         if (skipInvalidate()) {
   10854             return;
   10855         }
   10856         if ((mPrivateFlags & (PFLAG_DRAWN | PFLAG_HAS_BOUNDS)) == (PFLAG_DRAWN | PFLAG_HAS_BOUNDS) ||
   10857                 (mPrivateFlags & PFLAG_DRAWING_CACHE_VALID) == PFLAG_DRAWING_CACHE_VALID ||
   10858                 (mPrivateFlags & PFLAG_INVALIDATED) != PFLAG_INVALIDATED) {
   10859             mPrivateFlags &= ~PFLAG_DRAWING_CACHE_VALID;
   10860             mPrivateFlags |= PFLAG_INVALIDATED;
   10861             mPrivateFlags |= PFLAG_DIRTY;
   10862             final ViewParent p = mParent;
   10863             final AttachInfo ai = mAttachInfo;
   10864             //noinspection PointlessBooleanExpression,ConstantConditions
   10865             if (!HardwareRenderer.RENDER_DIRTY_REGIONS) {
   10866                 if (p != null && ai != null && ai.mHardwareAccelerated) {
   10867                     // fast-track for GL-enabled applications; just invalidate the whole hierarchy
   10868                     // with a null dirty rect, which tells the ViewAncestor to redraw everything
   10869                     p.invalidateChild(this, null);
   10870                     return;
   10871                 }
   10872             }
   10873             if (p != null && ai != null && l < r && t < b) {
   10874                 final int scrollX = mScrollX;
   10875                 final int scrollY = mScrollY;
   10876                 final Rect tmpr = ai.mTmpInvalRect;
   10877                 tmpr.set(l - scrollX, t - scrollY, r - scrollX, b - scrollY);
   10878                 p.invalidateChild(this, tmpr);
   10879             }
   10880         }
   10881     }
   10882 
   10883     /**
   10884      * Invalidate the whole view. If the view is visible,
   10885      * {@link #onDraw(android.graphics.Canvas)} will be called at some point in
   10886      * the future. This must be called from a UI thread. To call from a non-UI thread,
   10887      * call {@link #postInvalidate()}.
   10888      */
   10889     public void invalidate() {
   10890         invalidate(true);
   10891     }
   10892 
   10893     /**
   10894      * This is where the invalidate() work actually happens. A full invalidate()
   10895      * causes the drawing cache to be invalidated, but this function can be called with
   10896      * invalidateCache set to false to skip that invalidation step for cases that do not
   10897      * need it (for example, a component that remains at the same dimensions with the same
   10898      * content).
   10899      *
   10900      * @param invalidateCache Whether the drawing cache for this view should be invalidated as
   10901      * well. This is usually true for a full invalidate, but may be set to false if the
   10902      * View's contents or dimensions have not changed.
   10903      */
   10904     void invalidate(boolean invalidateCache) {
   10905         if (skipInvalidate()) {
   10906             return;
   10907         }
   10908         if ((mPrivateFlags & (PFLAG_DRAWN | PFLAG_HAS_BOUNDS)) == (PFLAG_DRAWN | PFLAG_HAS_BOUNDS) ||
   10909                 (invalidateCache && (mPrivateFlags & PFLAG_DRAWING_CACHE_VALID) == PFLAG_DRAWING_CACHE_VALID) ||
   10910                 (mPrivateFlags & PFLAG_INVALIDATED) != PFLAG_INVALIDATED || isOpaque() != mLastIsOpaque) {
   10911             mLastIsOpaque = isOpaque();
   10912             mPrivateFlags &= ~PFLAG_DRAWN;
   10913             mPrivateFlags |= PFLAG_DIRTY;
   10914             if (invalidateCache) {
   10915                 mPrivateFlags |= PFLAG_INVALIDATED;
   10916                 mPrivateFlags &= ~PFLAG_DRAWING_CACHE_VALID;
   10917             }
   10918             final AttachInfo ai = mAttachInfo;
   10919             final ViewParent p = mParent;
   10920             //noinspection PointlessBooleanExpression,ConstantConditions
   10921             if (!HardwareRenderer.RENDER_DIRTY_REGIONS) {
   10922                 if (p != null && ai != null && ai.mHardwareAccelerated) {
   10923                     // fast-track for GL-enabled applications; just invalidate the whole hierarchy
   10924                     // with a null dirty rect, which tells the ViewAncestor to redraw everything
   10925                     p.invalidateChild(this, null);
   10926                     return;
   10927                 }
   10928             }
   10929 
   10930             if (p != null && ai != null) {
   10931                 final Rect r = ai.mTmpInvalRect;
   10932                 r.set(0, 0, mRight - mLeft, mBottom - mTop);
   10933                 // Don't call invalidate -- we don't want to internally scroll
   10934                 // our own bounds
   10935                 p.invalidateChild(this, r);
   10936             }
   10937         }
   10938     }
   10939 
   10940     /**
   10941      * Quick invalidation for View property changes (alpha, translationXY, etc.). We don't want to
   10942      * set any flags or handle all of the cases handled by the default invalidation methods.
   10943      * Instead, we just want to schedule a traversal in ViewRootImpl with the appropriate
   10944      * dirty rect. This method calls into fast invalidation methods in ViewGroup that
   10945      * walk up the hierarchy, transforming the dirty rect as necessary.
   10946      *
   10947      * The method also handles normal invalidation logic if display list properties are not
   10948      * being used in this view. The invalidateParent and forceRedraw flags are used by that
   10949      * backup approach, to handle these cases used in the various property-setting methods.
   10950      *
   10951      * @param invalidateParent Force a call to invalidateParentCaches() if display list properties
   10952      * are not being used in this view
   10953      * @param forceRedraw Mark the view as DRAWN to force the invalidation to propagate, if display
   10954      * list properties are not being used in this view
   10955      */
   10956     void invalidateViewProperty(boolean invalidateParent, boolean forceRedraw) {
   10957         if (mDisplayList == null || (mPrivateFlags & PFLAG_DRAW_ANIMATION) == PFLAG_DRAW_ANIMATION) {
   10958             if (invalidateParent) {
   10959                 invalidateParentCaches();
   10960             }
   10961             if (forceRedraw) {
   10962                 mPrivateFlags |= PFLAG_DRAWN; // force another invalidation with the new orientation
   10963             }
   10964             invalidate(false);
   10965         } else {
   10966             final AttachInfo ai = mAttachInfo;
   10967             final ViewParent p = mParent;
   10968             if (p != null && ai != null) {
   10969                 final Rect r = ai.mTmpInvalRect;
   10970                 r.set(0, 0, mRight - mLeft, mBottom - mTop);
   10971                 if (mParent instanceof ViewGroup) {
   10972                     ((ViewGroup) mParent).invalidateChildFast(this, r);
   10973                 } else {
   10974                     mParent.invalidateChild(this, r);
   10975                 }
   10976             }
   10977         }
   10978     }
   10979 
   10980     /**
   10981      * Utility method to transform a given Rect by the current matrix of this view.
   10982      */
   10983     void transformRect(final Rect rect) {
   10984         if (!getMatrix().isIdentity()) {
   10985             RectF boundingRect = mAttachInfo.mTmpTransformRect;
   10986             boundingRect.set(rect);
   10987             getMatrix().mapRect(boundingRect);
   10988             rect.set((int) Math.floor(boundingRect.left),
   10989                     (int) Math.floor(boundingRect.top),
   10990                     (int) Math.ceil(boundingRect.right),
   10991                     (int) Math.ceil(boundingRect.bottom));
   10992         }
   10993     }
   10994 
   10995     /**
   10996      * Used to indicate that the parent of this view should clear its caches. This functionality
   10997      * is used to force the parent to rebuild its display list (when hardware-accelerated),
   10998      * which is necessary when various parent-managed properties of the view change, such as
   10999      * alpha, translationX/Y, scrollX/Y, scaleX/Y, and rotation/X/Y. This method only
   11000      * clears the parent caches and does not causes an invalidate event.
   11001      *
   11002      * @hide
   11003      */
   11004     protected void invalidateParentCaches() {
   11005         if (mParent instanceof View) {
   11006             ((View) mParent).mPrivateFlags |= PFLAG_INVALIDATED;
   11007         }
   11008     }
   11009 
   11010     /**
   11011      * Used to indicate that the parent of this view should be invalidated. This functionality
   11012      * is used to force the parent to rebuild its display list (when hardware-accelerated),
   11013      * which is necessary when various parent-managed properties of the view change, such as
   11014      * alpha, translationX/Y, scrollX/Y, scaleX/Y, and rotation/X/Y. This method will propagate
   11015      * an invalidation event to the parent.
   11016      *
   11017      * @hide
   11018      */
   11019     protected void invalidateParentIfNeeded() {
   11020         if (isHardwareAccelerated() && mParent instanceof View) {
   11021             ((View) mParent).invalidate(true);
   11022         }
   11023     }
   11024 
   11025     /**
   11026      * Indicates whether this View is opaque. An opaque View guarantees that it will
   11027      * draw all the pixels overlapping its bounds using a fully opaque color.
   11028      *
   11029      * Subclasses of View should override this method whenever possible to indicate
   11030      * whether an instance is opaque. Opaque Views are treated in a special way by
   11031      * the View hierarchy, possibly allowing it to perform optimizations during
   11032      * invalidate/draw passes.
   11033      *
   11034      * @return True if this View is guaranteed to be fully opaque, false otherwise.
   11035      */
   11036     @ViewDebug.ExportedProperty(category = "drawing")
   11037     public boolean isOpaque() {
   11038         return (mPrivateFlags & PFLAG_OPAQUE_MASK) == PFLAG_OPAQUE_MASK &&
   11039                 getFinalAlpha() >= 1.0f;
   11040     }
   11041 
   11042     /**
   11043      * @hide
   11044      */
   11045     protected void computeOpaqueFlags() {
   11046         // Opaque if:
   11047         //   - Has a background
   11048         //   - Background is opaque
   11049         //   - Doesn't have scrollbars or scrollbars overlay
   11050 
   11051         if (mBackground != null && mBackground.getOpacity() == PixelFormat.OPAQUE) {
   11052             mPrivateFlags |= PFLAG_OPAQUE_BACKGROUND;
   11053         } else {
   11054             mPrivateFlags &= ~PFLAG_OPAQUE_BACKGROUND;
   11055         }
   11056 
   11057         final int flags = mViewFlags;
   11058         if (((flags & SCROLLBARS_VERTICAL) == 0 && (flags & SCROLLBARS_HORIZONTAL) == 0) ||
   11059                 (flags & SCROLLBARS_STYLE_MASK) == SCROLLBARS_INSIDE_OVERLAY ||
   11060                 (flags & SCROLLBARS_STYLE_MASK) == SCROLLBARS_OUTSIDE_OVERLAY) {
   11061             mPrivateFlags |= PFLAG_OPAQUE_SCROLLBARS;
   11062         } else {
   11063             mPrivateFlags &= ~PFLAG_OPAQUE_SCROLLBARS;
   11064         }
   11065     }
   11066 
   11067     /**
   11068      * @hide
   11069      */
   11070     protected boolean hasOpaqueScrollbars() {
   11071         return (mPrivateFlags & PFLAG_OPAQUE_SCROLLBARS) == PFLAG_OPAQUE_SCROLLBARS;
   11072     }
   11073 
   11074     /**
   11075      * @return A handler associated with the thread running the View. This
   11076      * handler can be used to pump events in the UI events queue.
   11077      */
   11078     public Handler getHandler() {
   11079         final AttachInfo attachInfo = mAttachInfo;
   11080         if (attachInfo != null) {
   11081             return attachInfo.mHandler;
   11082         }
   11083         return null;
   11084     }
   11085 
   11086     /**
   11087      * Gets the view root associated with the View.
   11088      * @return The view root, or null if none.
   11089      * @hide
   11090      */
   11091     public ViewRootImpl getViewRootImpl() {
   11092         if (mAttachInfo != null) {
   11093             return mAttachInfo.mViewRootImpl;
   11094         }
   11095         return null;
   11096     }
   11097 
   11098     /**
   11099      * <p>Causes the Runnable to be added to the message queue.
   11100      * The runnable will be run on the user interface thread.</p>
   11101      *
   11102      * @param action The Runnable that will be executed.
   11103      *
   11104      * @return Returns true if the Runnable was successfully placed in to the
   11105      *         message queue.  Returns false on failure, usually because the
   11106      *         looper processing the message queue is exiting.
   11107      *
   11108      * @see #postDelayed
   11109      * @see #removeCallbacks
   11110      */
   11111     public boolean post(Runnable action) {
   11112         final AttachInfo attachInfo = mAttachInfo;
   11113         if (attachInfo != null) {
   11114             return attachInfo.mHandler.post(action);
   11115         }
   11116         // Assume that post will succeed later
   11117         ViewRootImpl.getRunQueue().post(action);
   11118         return true;
   11119     }
   11120 
   11121     /**
   11122      * <p>Causes the Runnable to be added to the message queue, to be run
   11123      * after the specified amount of time elapses.
   11124      * The runnable will be run on the user interface thread.</p>
   11125      *
   11126      * @param action The Runnable that will be executed.
   11127      * @param delayMillis The delay (in milliseconds) until the Runnable
   11128      *        will be executed.
   11129      *
   11130      * @return true if the Runnable was successfully placed in to the
   11131      *         message queue.  Returns false on failure, usually because the
   11132      *         looper processing the message queue is exiting.  Note that a
   11133      *         result of true does not mean the Runnable will be processed --
   11134      *         if the looper is quit before the delivery time of the message
   11135      *         occurs then the message will be dropped.
   11136      *
   11137      * @see #post
   11138      * @see #removeCallbacks
   11139      */
   11140     public boolean postDelayed(Runnable action, long delayMillis) {
   11141         final AttachInfo attachInfo = mAttachInfo;
   11142         if (attachInfo != null) {
   11143             return attachInfo.mHandler.postDelayed(action, delayMillis);
   11144         }
   11145         // Assume that post will succeed later
   11146         ViewRootImpl.getRunQueue().postDelayed(action, delayMillis);
   11147         return true;
   11148     }
   11149 
   11150     /**
   11151      * <p>Causes the Runnable to execute on the next animation time step.
   11152      * The runnable will be run on the user interface thread.</p>
   11153      *
   11154      * @param action The Runnable that will be executed.
   11155      *
   11156      * @see #postOnAnimationDelayed
   11157      * @see #removeCallbacks
   11158      */
   11159     public void postOnAnimation(Runnable action) {
   11160         final AttachInfo attachInfo = mAttachInfo;
   11161         if (attachInfo != null) {
   11162             attachInfo.mViewRootImpl.mChoreographer.postCallback(
   11163                     Choreographer.CALLBACK_ANIMATION, action, null);
   11164         } else {
   11165             // Assume that post will succeed later
   11166             ViewRootImpl.getRunQueue().post(action);
   11167         }
   11168     }
   11169 
   11170     /**
   11171      * <p>Causes the Runnable to execute on the next animation time step,
   11172      * after the specified amount of time elapses.
   11173      * The runnable will be run on the user interface thread.</p>
   11174      *
   11175      * @param action The Runnable that will be executed.
   11176      * @param delayMillis The delay (in milliseconds) until the Runnable
   11177      *        will be executed.
   11178      *
   11179      * @see #postOnAnimation
   11180      * @see #removeCallbacks
   11181      */
   11182     public void postOnAnimationDelayed(Runnable action, long delayMillis) {
   11183         final AttachInfo attachInfo = mAttachInfo;
   11184         if (attachInfo != null) {
   11185             attachInfo.mViewRootImpl.mChoreographer.postCallbackDelayed(
   11186                     Choreographer.CALLBACK_ANIMATION, action, null, delayMillis);
   11187         } else {
   11188             // Assume that post will succeed later
   11189             ViewRootImpl.getRunQueue().postDelayed(action, delayMillis);
   11190         }
   11191     }
   11192 
   11193     /**
   11194      * <p>Removes the specified Runnable from the message queue.</p>
   11195      *
   11196      * @param action The Runnable to remove from the message handling queue
   11197      *
   11198      * @return true if this view could ask the Handler to remove the Runnable,
   11199      *         false otherwise. When the returned value is true, the Runnable
   11200      *         may or may not have been actually removed from the message queue
   11201      *         (for instance, if the Runnable was not in the queue already.)
   11202      *
   11203      * @see #post
   11204      * @see #postDelayed
   11205      * @see #postOnAnimation
   11206      * @see #postOnAnimationDelayed
   11207      */
   11208     public boolean removeCallbacks(Runnable action) {
   11209         if (action != null) {
   11210             final AttachInfo attachInfo = mAttachInfo;
   11211             if (attachInfo != null) {
   11212                 attachInfo.mHandler.removeCallbacks(action);
   11213                 attachInfo.mViewRootImpl.mChoreographer.removeCallbacks(
   11214                         Choreographer.CALLBACK_ANIMATION, action, null);
   11215             } else {
   11216                 // Assume that post will succeed later
   11217                 ViewRootImpl.getRunQueue().removeCallbacks(action);
   11218             }
   11219         }
   11220         return true;
   11221     }
   11222 
   11223     /**
   11224      * <p>Cause an invalidate to happen on a subsequent cycle through the event loop.
   11225      * Use this to invalidate the View from a non-UI thread.</p>
   11226      *
   11227      * <p>This method can be invoked from outside of the UI thread
   11228      * only when this View is attached to a window.</p>
   11229      *
   11230      * @see #invalidate()
   11231      * @see #postInvalidateDelayed(long)
   11232      */
   11233     public void postInvalidate() {
   11234         postInvalidateDelayed(0);
   11235     }
   11236 
   11237     /**
   11238      * <p>Cause an invalidate of the specified area to happen on a subsequent cycle
   11239      * through the event loop. Use this to invalidate the View from a non-UI thread.</p>
   11240      *
   11241      * <p>This method can be invoked from outside of the UI thread
   11242      * only when this View is attached to a window.</p>
   11243      *
   11244      * @param left The left coordinate of the rectangle to invalidate.
   11245      * @param top The top coordinate of the rectangle to invalidate.
   11246      * @param right The right coordinate of the rectangle to invalidate.
   11247      * @param bottom The bottom coordinate of the rectangle to invalidate.
   11248      *
   11249      * @see #invalidate(int, int, int, int)
   11250      * @see #invalidate(Rect)
   11251      * @see #postInvalidateDelayed(long, int, int, int, int)
   11252      */
   11253     public void postInvalidate(int left, int top, int right, int bottom) {
   11254         postInvalidateDelayed(0, left, top, right, bottom);
   11255     }
   11256 
   11257     /**
   11258      * <p>Cause an invalidate to happen on a subsequent cycle through the event
   11259      * loop. Waits for the specified amount of time.</p>
   11260      *
   11261      * <p>This method can be invoked from outside of the UI thread
   11262      * only when this View is attached to a window.</p>
   11263      *
   11264      * @param delayMilliseconds the duration in milliseconds to delay the
   11265      *         invalidation by
   11266      *
   11267      * @see #invalidate()
   11268      * @see #postInvalidate()
   11269      */
   11270     public void postInvalidateDelayed(long delayMilliseconds) {
   11271         // We try only with the AttachInfo because there's no point in invalidating
   11272         // if we are not attached to our window
   11273         final AttachInfo attachInfo = mAttachInfo;
   11274         if (attachInfo != null) {
   11275             attachInfo.mViewRootImpl.dispatchInvalidateDelayed(this, delayMilliseconds);
   11276         }
   11277     }
   11278 
   11279     /**
   11280      * <p>Cause an invalidate of the specified area to happen on a subsequent cycle
   11281      * through the event loop. Waits for the specified amount of time.</p>
   11282      *
   11283      * <p>This method can be invoked from outside of the UI thread
   11284      * only when this View is attached to a window.</p>
   11285      *
   11286      * @param delayMilliseconds the duration in milliseconds to delay the
   11287      *         invalidation by
   11288      * @param left The left coordinate of the rectangle to invalidate.
   11289      * @param top The top coordinate of the rectangle to invalidate.
   11290      * @param right The right coordinate of the rectangle to invalidate.
   11291      * @param bottom The bottom coordinate of the rectangle to invalidate.
   11292      *
   11293      * @see #invalidate(int, int, int, int)
   11294      * @see #invalidate(Rect)
   11295      * @see #postInvalidate(int, int, int, int)
   11296      */
   11297     public void postInvalidateDelayed(long delayMilliseconds, int left, int top,
   11298             int right, int bottom) {
   11299 
   11300         // We try only with the AttachInfo because there's no point in invalidating
   11301         // if we are not attached to our window
   11302         final AttachInfo attachInfo = mAttachInfo;
   11303         if (attachInfo != null) {
   11304             final AttachInfo.InvalidateInfo info = AttachInfo.InvalidateInfo.obtain();
   11305             info.target = this;
   11306             info.left = left;
   11307             info.top = top;
   11308             info.right = right;
   11309             info.bottom = bottom;
   11310 
   11311             attachInfo.mViewRootImpl.dispatchInvalidateRectDelayed(info, delayMilliseconds);
   11312         }
   11313     }
   11314 
   11315     /**
   11316      * <p>Cause an invalidate to happen on the next animation time step, typically the
   11317      * next display frame.</p>
   11318      *
   11319      * <p>This method can be invoked from outside of the UI thread
   11320      * only when this View is attached to a window.</p>
   11321      *
   11322      * @see #invalidate()
   11323      */
   11324     public void postInvalidateOnAnimation() {
   11325         // We try only with the AttachInfo because there's no point in invalidating
   11326         // if we are not attached to our window
   11327         final AttachInfo attachInfo = mAttachInfo;
   11328         if (attachInfo != null) {
   11329             attachInfo.mViewRootImpl.dispatchInvalidateOnAnimation(this);
   11330         }
   11331     }
   11332 
   11333     /**
   11334      * <p>Cause an invalidate of the specified area to happen on the next animation
   11335      * time step, typically the next display frame.</p>
   11336      *
   11337      * <p>This method can be invoked from outside of the UI thread
   11338      * only when this View is attached to a window.</p>
   11339      *
   11340      * @param left The left coordinate of the rectangle to invalidate.
   11341      * @param top The top coordinate of the rectangle to invalidate.
   11342      * @param right The right coordinate of the rectangle to invalidate.
   11343      * @param bottom The bottom coordinate of the rectangle to invalidate.
   11344      *
   11345      * @see #invalidate(int, int, int, int)
   11346      * @see #invalidate(Rect)
   11347      */
   11348     public void postInvalidateOnAnimation(int left, int top, int right, int bottom) {
   11349         // We try only with the AttachInfo because there's no point in invalidating
   11350         // if we are not attached to our window
   11351         final AttachInfo attachInfo = mAttachInfo;
   11352         if (attachInfo != null) {
   11353             final AttachInfo.InvalidateInfo info = AttachInfo.InvalidateInfo.obtain();
   11354             info.target = this;
   11355             info.left = left;
   11356             info.top = top;
   11357             info.right = right;
   11358             info.bottom = bottom;
   11359 
   11360             attachInfo.mViewRootImpl.dispatchInvalidateRectOnAnimation(info);
   11361         }
   11362     }
   11363 
   11364     /**
   11365      * Post a callback to send a {@link AccessibilityEvent#TYPE_VIEW_SCROLLED} event.
   11366      * This event is sent at most once every
   11367      * {@link ViewConfiguration#getSendRecurringAccessibilityEventsInterval()}.
   11368      */
   11369     private void postSendViewScrolledAccessibilityEventCallback() {
   11370         if (mSendViewScrolledAccessibilityEvent == null) {
   11371             mSendViewScrolledAccessibilityEvent = new SendViewScrolledAccessibilityEvent();
   11372         }
   11373         if (!mSendViewScrolledAccessibilityEvent.mIsPending) {
   11374             mSendViewScrolledAccessibilityEvent.mIsPending = true;
   11375             postDelayed(mSendViewScrolledAccessibilityEvent,
   11376                     ViewConfiguration.getSendRecurringAccessibilityEventsInterval());
   11377         }
   11378     }
   11379 
   11380     /**
   11381      * Called by a parent to request that a child update its values for mScrollX
   11382      * and mScrollY if necessary. This will typically be done if the child is
   11383      * animating a scroll using a {@link android.widget.Scroller Scroller}
   11384      * object.
   11385      */
   11386     public void computeScroll() {
   11387     }
   11388 
   11389     /**
   11390      * <p>Indicate whether the horizontal edges are faded when the view is
   11391      * scrolled horizontally.</p>
   11392      *
   11393      * @return true if the horizontal edges should are faded on scroll, false
   11394      *         otherwise
   11395      *
   11396      * @see #setHorizontalFadingEdgeEnabled(boolean)
   11397      *
   11398      * @attr ref android.R.styleable#View_requiresFadingEdge
   11399      */
   11400     public boolean isHorizontalFadingEdgeEnabled() {
   11401         return (mViewFlags & FADING_EDGE_HORIZONTAL) == FADING_EDGE_HORIZONTAL;
   11402     }
   11403 
   11404     /**
   11405      * <p>Define whether the horizontal edges should be faded when this view
   11406      * is scrolled horizontally.</p>
   11407      *
   11408      * @param horizontalFadingEdgeEnabled true if the horizontal edges should
   11409      *                                    be faded when the view is scrolled
   11410      *                                    horizontally
   11411      *
   11412      * @see #isHorizontalFadingEdgeEnabled()
   11413      *
   11414      * @attr ref android.R.styleable#View_requiresFadingEdge
   11415      */
   11416     public void setHorizontalFadingEdgeEnabled(boolean horizontalFadingEdgeEnabled) {
   11417         if (isHorizontalFadingEdgeEnabled() != horizontalFadingEdgeEnabled) {
   11418             if (horizontalFadingEdgeEnabled) {
   11419                 initScrollCache();
   11420             }
   11421 
   11422             mViewFlags ^= FADING_EDGE_HORIZONTAL;
   11423         }
   11424     }
   11425 
   11426     /**
   11427      * <p>Indicate whether the vertical edges are faded when the view is
   11428      * scrolled horizontally.</p>
   11429      *
   11430      * @return true if the vertical edges should are faded on scroll, false
   11431      *         otherwise
   11432      *
   11433      * @see #setVerticalFadingEdgeEnabled(boolean)
   11434      *
   11435      * @attr ref android.R.styleable#View_requiresFadingEdge
   11436      */
   11437     public boolean isVerticalFadingEdgeEnabled() {
   11438         return (mViewFlags & FADING_EDGE_VERTICAL) == FADING_EDGE_VERTICAL;
   11439     }
   11440 
   11441     /**
   11442      * <p>Define whether the vertical edges should be faded when this view
   11443      * is scrolled vertically.</p>
   11444      *
   11445      * @param verticalFadingEdgeEnabled true if the vertical edges should
   11446      *                                  be faded when the view is scrolled
   11447      *                                  vertically
   11448      *
   11449      * @see #isVerticalFadingEdgeEnabled()
   11450      *
   11451      * @attr ref android.R.styleable#View_requiresFadingEdge
   11452      */
   11453     public void setVerticalFadingEdgeEnabled(boolean verticalFadingEdgeEnabled) {
   11454         if (isVerticalFadingEdgeEnabled() != verticalFadingEdgeEnabled) {
   11455             if (verticalFadingEdgeEnabled) {
   11456                 initScrollCache();
   11457             }
   11458 
   11459             mViewFlags ^= FADING_EDGE_VERTICAL;
   11460         }
   11461     }
   11462 
   11463     /**
   11464      * Returns the strength, or intensity, of the top faded edge. The strength is
   11465      * a value between 0.0 (no fade) and 1.0 (full fade). The default implementation
   11466      * returns 0.0 or 1.0 but no value in between.
   11467      *
   11468      * Subclasses should override this method to provide a smoother fade transition
   11469      * when scrolling occurs.
   11470      *
   11471      * @return the intensity of the top fade as a float between 0.0f and 1.0f
   11472      */
   11473     protected float getTopFadingEdgeStrength() {
   11474         return computeVerticalScrollOffset() > 0 ? 1.0f : 0.0f;
   11475     }
   11476 
   11477     /**
   11478      * Returns the strength, or intensity, of the bottom faded edge. The strength is
   11479      * a value between 0.0 (no fade) and 1.0 (full fade). The default implementation
   11480      * returns 0.0 or 1.0 but no value in between.
   11481      *
   11482      * Subclasses should override this method to provide a smoother fade transition
   11483      * when scrolling occurs.
   11484      *
   11485      * @return the intensity of the bottom fade as a float between 0.0f and 1.0f
   11486      */
   11487     protected float getBottomFadingEdgeStrength() {
   11488         return computeVerticalScrollOffset() + computeVerticalScrollExtent() <
   11489                 computeVerticalScrollRange() ? 1.0f : 0.0f;
   11490     }
   11491 
   11492     /**
   11493      * Returns the strength, or intensity, of the left faded edge. The strength is
   11494      * a value between 0.0 (no fade) and 1.0 (full fade). The default implementation
   11495      * returns 0.0 or 1.0 but no value in between.
   11496      *
   11497      * Subclasses should override this method to provide a smoother fade transition
   11498      * when scrolling occurs.
   11499      *
   11500      * @return the intensity of the left fade as a float between 0.0f and 1.0f
   11501      */
   11502     protected float getLeftFadingEdgeStrength() {
   11503         return computeHorizontalScrollOffset() > 0 ? 1.0f : 0.0f;
   11504     }
   11505 
   11506     /**
   11507      * Returns the strength, or intensity, of the right faded edge. The strength is
   11508      * a value between 0.0 (no fade) and 1.0 (full fade). The default implementation
   11509      * returns 0.0 or 1.0 but no value in between.
   11510      *
   11511      * Subclasses should override this method to provide a smoother fade transition
   11512      * when scrolling occurs.
   11513      *
   11514      * @return the intensity of the right fade as a float between 0.0f and 1.0f
   11515      */
   11516     protected float getRightFadingEdgeStrength() {
   11517         return computeHorizontalScrollOffset() + computeHorizontalScrollExtent() <
   11518                 computeHorizontalScrollRange() ? 1.0f : 0.0f;
   11519     }
   11520 
   11521     /**
   11522      * <p>Indicate whether the horizontal scrollbar should be drawn or not. The
   11523      * scrollbar is not drawn by default.</p>
   11524      *
   11525      * @return true if the horizontal scrollbar should be painted, false
   11526      *         otherwise
   11527      *
   11528      * @see #setHorizontalScrollBarEnabled(boolean)
   11529      */
   11530     public boolean isHorizontalScrollBarEnabled() {
   11531         return (mViewFlags & SCROLLBARS_HORIZONTAL) == SCROLLBARS_HORIZONTAL;
   11532     }
   11533 
   11534     /**
   11535      * <p>Define whether the horizontal scrollbar should be drawn or not. The
   11536      * scrollbar is not drawn by default.</p>
   11537      *
   11538      * @param horizontalScrollBarEnabled true if the horizontal scrollbar should
   11539      *                                   be painted
   11540      *
   11541      * @see #isHorizontalScrollBarEnabled()
   11542      */
   11543     public void setHorizontalScrollBarEnabled(boolean horizontalScrollBarEnabled) {
   11544         if (isHorizontalScrollBarEnabled() != horizontalScrollBarEnabled) {
   11545             mViewFlags ^= SCROLLBARS_HORIZONTAL;
   11546             computeOpaqueFlags();
   11547             resolvePadding();
   11548         }
   11549     }
   11550 
   11551     /**
   11552      * <p>Indicate whether the vertical scrollbar should be drawn or not. The
   11553      * scrollbar is not drawn by default.</p>
   11554      *
   11555      * @return true if the vertical scrollbar should be painted, false
   11556      *         otherwise
   11557      *
   11558      * @see #setVerticalScrollBarEnabled(boolean)
   11559      */
   11560     public boolean isVerticalScrollBarEnabled() {
   11561         return (mViewFlags & SCROLLBARS_VERTICAL) == SCROLLBARS_VERTICAL;
   11562     }
   11563 
   11564     /**
   11565      * <p>Define whether the vertical scrollbar should be drawn or not. The
   11566      * scrollbar is not drawn by default.</p>
   11567      *
   11568      * @param verticalScrollBarEnabled true if the vertical scrollbar should
   11569      *                                 be painted
   11570      *
   11571      * @see #isVerticalScrollBarEnabled()
   11572      */
   11573     public void setVerticalScrollBarEnabled(boolean verticalScrollBarEnabled) {
   11574         if (isVerticalScrollBarEnabled() != verticalScrollBarEnabled) {
   11575             mViewFlags ^= SCROLLBARS_VERTICAL;
   11576             computeOpaqueFlags();
   11577             resolvePadding();
   11578         }
   11579     }
   11580 
   11581     /**
   11582      * @hide
   11583      */
   11584     protected void recomputePadding() {
   11585         internalSetPadding(mUserPaddingLeft, mPaddingTop, mUserPaddingRight, mUserPaddingBottom);
   11586     }
   11587 
   11588     /**
   11589      * Define whether scrollbars will fade when the view is not scrolling.
   11590      *
   11591      * @param fadeScrollbars wheter to enable fading
   11592      *
   11593      * @attr ref android.R.styleable#View_fadeScrollbars
   11594      */
   11595     public void setScrollbarFadingEnabled(boolean fadeScrollbars) {
   11596         initScrollCache();
   11597         final ScrollabilityCache scrollabilityCache = mScrollCache;
   11598         scrollabilityCache.fadeScrollBars = fadeScrollbars;
   11599         if (fadeScrollbars) {
   11600             scrollabilityCache.state = ScrollabilityCache.OFF;
   11601         } else {
   11602             scrollabilityCache.state = ScrollabilityCache.ON;
   11603         }
   11604     }
   11605 
   11606     /**
   11607      *
   11608      * Returns true if scrollbars will fade when this view is not scrolling
   11609      *
   11610      * @return true if scrollbar fading is enabled
   11611      *
   11612      * @attr ref android.R.styleable#View_fadeScrollbars
   11613      */
   11614     public boolean isScrollbarFadingEnabled() {
   11615         return mScrollCache != null && mScrollCache.fadeScrollBars;
   11616     }
   11617 
   11618     /**
   11619      *
   11620      * Returns the delay before scrollbars fade.
   11621      *
   11622      * @return the delay before scrollbars fade
   11623      *
   11624      * @attr ref android.R.styleable#View_scrollbarDefaultDelayBeforeFade
   11625      */
   11626     public int getScrollBarDefaultDelayBeforeFade() {
   11627         return mScrollCache == null ? ViewConfiguration.getScrollDefaultDelay() :
   11628                 mScrollCache.scrollBarDefaultDelayBeforeFade;
   11629     }
   11630 
   11631     /**
   11632      * Define the delay before scrollbars fade.
   11633      *
   11634      * @param scrollBarDefaultDelayBeforeFade - the delay before scrollbars fade
   11635      *
   11636      * @attr ref android.R.styleable#View_scrollbarDefaultDelayBeforeFade
   11637      */
   11638     public void setScrollBarDefaultDelayBeforeFade(int scrollBarDefaultDelayBeforeFade) {
   11639         getScrollCache().scrollBarDefaultDelayBeforeFade = scrollBarDefaultDelayBeforeFade;
   11640     }
   11641 
   11642     /**
   11643      *
   11644      * Returns the scrollbar fade duration.
   11645      *
   11646      * @return the scrollbar fade duration
   11647      *
   11648      * @attr ref android.R.styleable#View_scrollbarFadeDuration
   11649      */
   11650     public int getScrollBarFadeDuration() {
   11651         return mScrollCache == null ? ViewConfiguration.getScrollBarFadeDuration() :
   11652                 mScrollCache.scrollBarFadeDuration;
   11653     }
   11654 
   11655     /**
   11656      * Define the scrollbar fade duration.
   11657      *
   11658      * @param scrollBarFadeDuration - the scrollbar fade duration
   11659      *
   11660      * @attr ref android.R.styleable#View_scrollbarFadeDuration
   11661      */
   11662     public void setScrollBarFadeDuration(int scrollBarFadeDuration) {
   11663         getScrollCache().scrollBarFadeDuration = scrollBarFadeDuration;
   11664     }
   11665 
   11666     /**
   11667      *
   11668      * Returns the scrollbar size.
   11669      *
   11670      * @return the scrollbar size
   11671      *
   11672      * @attr ref android.R.styleable#View_scrollbarSize
   11673      */
   11674     public int getScrollBarSize() {
   11675         return mScrollCache == null ? ViewConfiguration.get(mContext).getScaledScrollBarSize() :
   11676                 mScrollCache.scrollBarSize;
   11677     }
   11678 
   11679     /**
   11680      * Define the scrollbar size.
   11681      *
   11682      * @param scrollBarSize - the scrollbar size
   11683      *
   11684      * @attr ref android.R.styleable#View_scrollbarSize
   11685      */
   11686     public void setScrollBarSize(int scrollBarSize) {
   11687         getScrollCache().scrollBarSize = scrollBarSize;
   11688     }
   11689 
   11690     /**
   11691      * <p>Specify the style of the scrollbars. The scrollbars can be overlaid or
   11692      * inset. When inset, they add to the padding of the view. And the scrollbars
   11693      * can be drawn inside the padding area or on the edge of the view. For example,
   11694      * if a view has a background drawable and you want to draw the scrollbars
   11695      * inside the padding specified by the drawable, you can use
   11696      * SCROLLBARS_INSIDE_OVERLAY or SCROLLBARS_INSIDE_INSET. If you want them to
   11697      * appear at the edge of the view, ignoring the padding, then you can use
   11698      * SCROLLBARS_OUTSIDE_OVERLAY or SCROLLBARS_OUTSIDE_INSET.</p>
   11699      * @param style the style of the scrollbars. Should be one of
   11700      * SCROLLBARS_INSIDE_OVERLAY, SCROLLBARS_INSIDE_INSET,
   11701      * SCROLLBARS_OUTSIDE_OVERLAY or SCROLLBARS_OUTSIDE_INSET.
   11702      * @see #SCROLLBARS_INSIDE_OVERLAY
   11703      * @see #SCROLLBARS_INSIDE_INSET
   11704      * @see #SCROLLBARS_OUTSIDE_OVERLAY
   11705      * @see #SCROLLBARS_OUTSIDE_INSET
   11706      *
   11707      * @attr ref android.R.styleable#View_scrollbarStyle
   11708      */
   11709     public void setScrollBarStyle(int style) {
   11710         if (style != (mViewFlags & SCROLLBARS_STYLE_MASK)) {
   11711             mViewFlags = (mViewFlags & ~SCROLLBARS_STYLE_MASK) | (style & SCROLLBARS_STYLE_MASK);
   11712             computeOpaqueFlags();
   11713             resolvePadding();
   11714         }
   11715     }
   11716 
   11717     /**
   11718      * <p>Returns the current scrollbar style.</p>
   11719      * @return the current scrollbar style
   11720      * @see #SCROLLBARS_INSIDE_OVERLAY
   11721      * @see #SCROLLBARS_INSIDE_INSET
   11722      * @see #SCROLLBARS_OUTSIDE_OVERLAY
   11723      * @see #SCROLLBARS_OUTSIDE_INSET
   11724      *
   11725      * @attr ref android.R.styleable#View_scrollbarStyle
   11726      */
   11727     @ViewDebug.ExportedProperty(mapping = {
   11728             @ViewDebug.IntToString(from = SCROLLBARS_INSIDE_OVERLAY, to = "INSIDE_OVERLAY"),
   11729             @ViewDebug.IntToString(from = SCROLLBARS_INSIDE_INSET, to = "INSIDE_INSET"),
   11730             @ViewDebug.IntToString(from = SCROLLBARS_OUTSIDE_OVERLAY, to = "OUTSIDE_OVERLAY"),
   11731             @ViewDebug.IntToString(from = SCROLLBARS_OUTSIDE_INSET, to = "OUTSIDE_INSET")
   11732     })
   11733     public int getScrollBarStyle() {
   11734         return mViewFlags & SCROLLBARS_STYLE_MASK;
   11735     }
   11736 
   11737     /**
   11738      * <p>Compute the horizontal range that the horizontal scrollbar
   11739      * represents.</p>
   11740      *
   11741      * <p>The range is expressed in arbitrary units that must be the same as the
   11742      * units used by {@link #computeHorizontalScrollExtent()} and
   11743      * {@link #computeHorizontalScrollOffset()}.</p>
   11744      *
   11745      * <p>The default range is the drawing width of this view.</p>
   11746      *
   11747      * @return the total horizontal range represented by the horizontal
   11748      *         scrollbar
   11749      *
   11750      * @see #computeHorizontalScrollExtent()
   11751      * @see #computeHorizontalScrollOffset()
   11752      * @see android.widget.ScrollBarDrawable
   11753      */
   11754     protected int computeHorizontalScrollRange() {
   11755         return getWidth();
   11756     }
   11757 
   11758     /**
   11759      * <p>Compute the horizontal offset of the horizontal scrollbar's thumb
   11760      * within the horizontal range. This value is used to compute the position
   11761      * of the thumb within the scrollbar's track.</p>
   11762      *
   11763      * <p>The range is expressed in arbitrary units that must be the same as the
   11764      * units used by {@link #computeHorizontalScrollRange()} and
   11765      * {@link #computeHorizontalScrollExtent()}.</p>
   11766      *
   11767      * <p>The default offset is the scroll offset of this view.</p>
   11768      *
   11769      * @return the horizontal offset of the scrollbar's thumb
   11770      *
   11771      * @see #computeHorizontalScrollRange()
   11772      * @see #computeHorizontalScrollExtent()
   11773      * @see android.widget.ScrollBarDrawable
   11774      */
   11775     protected int computeHorizontalScrollOffset() {
   11776         return mScrollX;
   11777     }
   11778 
   11779     /**
   11780      * <p>Compute the horizontal extent of the horizontal scrollbar's thumb
   11781      * within the horizontal range. This value is used to compute the length
   11782      * of the thumb within the scrollbar's track.</p>
   11783      *
   11784      * <p>The range is expressed in arbitrary units that must be the same as the
   11785      * units used by {@link #computeHorizontalScrollRange()} and
   11786      * {@link #computeHorizontalScrollOffset()}.</p>
   11787      *
   11788      * <p>The default extent is the drawing width of this view.</p>
   11789      *
   11790      * @return the horizontal extent of the scrollbar's thumb
   11791      *
   11792      * @see #computeHorizontalScrollRange()
   11793      * @see #computeHorizontalScrollOffset()
   11794      * @see android.widget.ScrollBarDrawable
   11795      */
   11796     protected int computeHorizontalScrollExtent() {
   11797         return getWidth();
   11798     }
   11799 
   11800     /**
   11801      * <p>Compute the vertical range that the vertical scrollbar represents.</p>
   11802      *
   11803      * <p>The range is expressed in arbitrary units that must be the same as the
   11804      * units used by {@link #computeVerticalScrollExtent()} and
   11805      * {@link #computeVerticalScrollOffset()}.</p>
   11806      *
   11807      * @return the total vertical range represented by the vertical scrollbar
   11808      *
   11809      * <p>The default range is the drawing height of this view.</p>
   11810      *
   11811      * @see #computeVerticalScrollExtent()
   11812      * @see #computeVerticalScrollOffset()
   11813      * @see android.widget.ScrollBarDrawable
   11814      */
   11815     protected int computeVerticalScrollRange() {
   11816         return getHeight();
   11817     }
   11818 
   11819     /**
   11820      * <p>Compute the vertical offset of the vertical scrollbar's thumb
   11821      * within the horizontal range. This value is used to compute the position
   11822      * of the thumb within the scrollbar's track.</p>
   11823      *
   11824      * <p>The range is expressed in arbitrary units that must be the same as the
   11825      * units used by {@link #computeVerticalScrollRange()} and
   11826      * {@link #computeVerticalScrollExtent()}.</p>
   11827      *
   11828      * <p>The default offset is the scroll offset of this view.</p>
   11829      *
   11830      * @return the vertical offset of the scrollbar's thumb
   11831      *
   11832      * @see #computeVerticalScrollRange()
   11833      * @see #computeVerticalScrollExtent()
   11834      * @see android.widget.ScrollBarDrawable
   11835      */
   11836     protected int computeVerticalScrollOffset() {
   11837         return mScrollY;
   11838     }
   11839 
   11840     /**
   11841      * <p>Compute the vertical extent of the horizontal scrollbar's thumb
   11842      * within the vertical range. This value is used to compute the length
   11843      * of the thumb within the scrollbar's track.</p>
   11844      *
   11845      * <p>The range is expressed in arbitrary units that must be the same as the
   11846      * units used by {@link #computeVerticalScrollRange()} and
   11847      * {@link #computeVerticalScrollOffset()}.</p>
   11848      *
   11849      * <p>The default extent is the drawing height of this view.</p>
   11850      *
   11851      * @return the vertical extent of the scrollbar's thumb
   11852      *
   11853      * @see #computeVerticalScrollRange()
   11854      * @see #computeVerticalScrollOffset()
   11855      * @see android.widget.ScrollBarDrawable
   11856      */
   11857     protected int computeVerticalScrollExtent() {
   11858         return getHeight();
   11859     }
   11860 
   11861     /**
   11862      * Check if this view can be scrolled horizontally in a certain direction.
   11863      *
   11864      * @param direction Negative to check scrolling left, positive to check scrolling right.
   11865      * @return true if this view can be scrolled in the specified direction, false otherwise.
   11866      */
   11867     public boolean canScrollHorizontally(int direction) {
   11868         final int offset = computeHorizontalScrollOffset();
   11869         final int range = computeHorizontalScrollRange() - computeHorizontalScrollExtent();
   11870         if (range == 0) return false;
   11871         if (direction < 0) {
   11872             return offset > 0;
   11873         } else {
   11874             return offset < range - 1;
   11875         }
   11876     }
   11877 
   11878     /**
   11879      * Check if this view can be scrolled vertically in a certain direction.
   11880      *
   11881      * @param direction Negative to check scrolling up, positive to check scrolling down.
   11882      * @return true if this view can be scrolled in the specified direction, false otherwise.
   11883      */
   11884     public boolean canScrollVertically(int direction) {
   11885         final int offset = computeVerticalScrollOffset();
   11886         final int range = computeVerticalScrollRange() - computeVerticalScrollExtent();
   11887         if (range == 0) return false;
   11888         if (direction < 0) {
   11889             return offset > 0;
   11890         } else {
   11891             return offset < range - 1;
   11892         }
   11893     }
   11894 
   11895     /**
   11896      * <p>Request the drawing of the horizontal and the vertical scrollbar. The
   11897      * scrollbars are painted only if they have been awakened first.</p>
   11898      *
   11899      * @param canvas the canvas on which to draw the scrollbars
   11900      *
   11901      * @see #awakenScrollBars(int)
   11902      */
   11903     protected final void onDrawScrollBars(Canvas canvas) {
   11904         // scrollbars are drawn only when the animation is running
   11905         final ScrollabilityCache cache = mScrollCache;
   11906         if (cache != null) {
   11907 
   11908             int state = cache.state;
   11909 
   11910             if (state == ScrollabilityCache.OFF) {
   11911                 return;
   11912             }
   11913 
   11914             boolean invalidate = false;
   11915 
   11916             if (state == ScrollabilityCache.FADING) {
   11917                 // We're fading -- get our fade interpolation
   11918                 if (cache.interpolatorValues == null) {
   11919                     cache.interpolatorValues = new float[1];
   11920                 }
   11921 
   11922                 float[] values = cache.interpolatorValues;
   11923 
   11924                 // Stops the animation if we're done
   11925                 if (cache.scrollBarInterpolator.timeToValues(values) ==
   11926                         Interpolator.Result.FREEZE_END) {
   11927                     cache.state = ScrollabilityCache.OFF;
   11928                 } else {
   11929                     cache.scrollBar.setAlpha(Math.round(values[0]));
   11930                 }
   11931 
   11932                 // This will make the scroll bars inval themselves after
   11933                 // drawing. We only want this when we're fading so that
   11934                 // we prevent excessive redraws
   11935                 invalidate = true;
   11936             } else {
   11937                 // We're just on -- but we may have been fading before so
   11938                 // reset alpha
   11939                 cache.scrollBar.setAlpha(255);
   11940             }
   11941 
   11942 
   11943             final int viewFlags = mViewFlags;
   11944 
   11945             final boolean drawHorizontalScrollBar =
   11946                 (viewFlags & SCROLLBARS_HORIZONTAL) == SCROLLBARS_HORIZONTAL;
   11947             final boolean drawVerticalScrollBar =
   11948                 (viewFlags & SCROLLBARS_VERTICAL) == SCROLLBARS_VERTICAL
   11949                 && !isVerticalScrollBarHidden();
   11950 
   11951             if (drawVerticalScrollBar || drawHorizontalScrollBar) {
   11952                 final int width = mRight - mLeft;
   11953                 final int height = mBottom - mTop;
   11954 
   11955                 final ScrollBarDrawable scrollBar = cache.scrollBar;
   11956 
   11957                 final int scrollX = mScrollX;
   11958                 final int scrollY = mScrollY;
   11959                 final int inside = (viewFlags & SCROLLBARS_OUTSIDE_MASK) == 0 ? ~0 : 0;
   11960 
   11961                 int left;
   11962                 int top;
   11963                 int right;
   11964                 int bottom;
   11965 
   11966                 if (drawHorizontalScrollBar) {
   11967                     int size = scrollBar.getSize(false);
   11968                     if (size <= 0) {
   11969                         size = cache.scrollBarSize;
   11970                     }
   11971 
   11972                     scrollBar.setParameters(computeHorizontalScrollRange(),
   11973                                             computeHorizontalScrollOffset(),
   11974                                             computeHorizontalScrollExtent(), false);
   11975                     final int verticalScrollBarGap = drawVerticalScrollBar ?
   11976                             getVerticalScrollbarWidth() : 0;
   11977                     top = scrollY + height - size - (mUserPaddingBottom & inside);
   11978                     left = scrollX + (mPaddingLeft & inside);
   11979                     right = scrollX + width - (mUserPaddingRight & inside) - verticalScrollBarGap;
   11980                     bottom = top + size;
   11981                     onDrawHorizontalScrollBar(canvas, scrollBar, left, top, right, bottom);
   11982                     if (invalidate) {
   11983                         invalidate(left, top, right, bottom);
   11984                     }
   11985                 }
   11986 
   11987                 if (drawVerticalScrollBar) {
   11988                     int size = scrollBar.getSize(true);
   11989                     if (size <= 0) {
   11990                         size = cache.scrollBarSize;
   11991                     }
   11992 
   11993                     scrollBar.setParameters(computeVerticalScrollRange(),
   11994                                             computeVerticalScrollOffset(),
   11995                                             computeVerticalScrollExtent(), true);
   11996                     int verticalScrollbarPosition = mVerticalScrollbarPosition;
   11997                     if (verticalScrollbarPosition == SCROLLBAR_POSITION_DEFAULT) {
   11998                         verticalScrollbarPosition = isLayoutRtl() ?
   11999                                 SCROLLBAR_POSITION_LEFT : SCROLLBAR_POSITION_RIGHT;
   12000                     }
   12001                     switch (verticalScrollbarPosition) {
   12002                         default:
   12003                         case SCROLLBAR_POSITION_RIGHT:
   12004                             left = scrollX + width - size - (mUserPaddingRight & inside);
   12005                             break;
   12006                         case SCROLLBAR_POSITION_LEFT:
   12007                             left = scrollX + (mUserPaddingLeft & inside);
   12008                             break;
   12009                     }
   12010                     top = scrollY + (mPaddingTop & inside);
   12011                     right = left + size;
   12012                     bottom = scrollY + height - (mUserPaddingBottom & inside);
   12013                     onDrawVerticalScrollBar(canvas, scrollBar, left, top, right, bottom);
   12014                     if (invalidate) {
   12015                         invalidate(left, top, right, bottom);
   12016                     }
   12017                 }
   12018             }
   12019         }
   12020     }
   12021 
   12022     /**
   12023      * Override this if the vertical scrollbar needs to be hidden in a subclass, like when
   12024      * FastScroller is visible.
   12025      * @return whether to temporarily hide the vertical scrollbar
   12026      * @hide
   12027      */
   12028     protected boolean isVerticalScrollBarHidden() {
   12029         return false;
   12030     }
   12031 
   12032     /**
   12033      * <p>Draw the horizontal scrollbar if
   12034      * {@link #isHorizontalScrollBarEnabled()} returns true.</p>
   12035      *
   12036      * @param canvas the canvas on which to draw the scrollbar
   12037      * @param scrollBar the scrollbar's drawable
   12038      *
   12039      * @see #isHorizontalScrollBarEnabled()
   12040      * @see #computeHorizontalScrollRange()
   12041      * @see #computeHorizontalScrollExtent()
   12042      * @see #computeHorizontalScrollOffset()
   12043      * @see android.widget.ScrollBarDrawable
   12044      * @hide
   12045      */
   12046     protected void onDrawHorizontalScrollBar(Canvas canvas, Drawable scrollBar,
   12047             int l, int t, int r, int b) {
   12048         scrollBar.setBounds(l, t, r, b);
   12049         scrollBar.draw(canvas);
   12050     }
   12051 
   12052     /**
   12053      * <p>Draw the vertical scrollbar if {@link #isVerticalScrollBarEnabled()}
   12054      * returns true.</p>
   12055      *
   12056      * @param canvas the canvas on which to draw the scrollbar
   12057      * @param scrollBar the scrollbar's drawable
   12058      *
   12059      * @see #isVerticalScrollBarEnabled()
   12060      * @see #computeVerticalScrollRange()
   12061      * @see #computeVerticalScrollExtent()
   12062      * @see #computeVerticalScrollOffset()
   12063      * @see android.widget.ScrollBarDrawable
   12064      * @hide
   12065      */
   12066     protected void onDrawVerticalScrollBar(Canvas canvas, Drawable scrollBar,
   12067             int l, int t, int r, int b) {
   12068         scrollBar.setBounds(l, t, r, b);
   12069         scrollBar.draw(canvas);
   12070     }
   12071 
   12072     /**
   12073      * Implement this to do your drawing.
   12074      *
   12075      * @param canvas the canvas on which the background will be drawn
   12076      */
   12077     protected void onDraw(Canvas canvas) {
   12078     }
   12079 
   12080     /*
   12081      * Caller is responsible for calling requestLayout if necessary.
   12082      * (This allows addViewInLayout to not request a new layout.)
   12083      */
   12084     void assignParent(ViewParent parent) {
   12085         if (mParent == null) {
   12086             mParent = parent;
   12087         } else if (parent == null) {
   12088             mParent = null;
   12089         } else {
   12090             throw new RuntimeException("view " + this + " being added, but"
   12091                     + " it already has a parent");
   12092         }
   12093     }
   12094 
   12095     /**
   12096      * This is called when the view is attached to a window.  At this point it
   12097      * has a Surface and will start drawing.  Note that this function is
   12098      * guaranteed to be called before {@link #onDraw(android.graphics.Canvas)},
   12099      * however it may be called any time before the first onDraw -- including
   12100      * before or after {@link #onMeasure(int, int)}.
   12101      *
   12102      * @see #onDetachedFromWindow()
   12103      */
   12104     protected void onAttachedToWindow() {
   12105         if ((mPrivateFlags & PFLAG_REQUEST_TRANSPARENT_REGIONS) != 0) {
   12106             mParent.requestTransparentRegion(this);
   12107         }
   12108 
   12109         if ((mPrivateFlags & PFLAG_AWAKEN_SCROLL_BARS_ON_ATTACH) != 0) {
   12110             initialAwakenScrollBars();
   12111             mPrivateFlags &= ~PFLAG_AWAKEN_SCROLL_BARS_ON_ATTACH;
   12112         }
   12113 
   12114         mPrivateFlags3 &= ~PFLAG3_IS_LAID_OUT;
   12115 
   12116         jumpDrawablesToCurrentState();
   12117 
   12118         resetSubtreeAccessibilityStateChanged();
   12119 
   12120         if (isFocused()) {
   12121             InputMethodManager imm = InputMethodManager.peekInstance();
   12122             imm.focusIn(this);
   12123         }
   12124 
   12125         if (mDisplayList != null) {
   12126             mDisplayList.clearDirty();
   12127         }
   12128     }
   12129 
   12130     /**
   12131      * Resolve all RTL related properties.
   12132      *
   12133      * @return true if resolution of RTL properties has been done
   12134      *
   12135      * @hide
   12136      */
   12137     public boolean resolveRtlPropertiesIfNeeded() {
   12138         if (!needRtlPropertiesResolution()) return false;
   12139 
   12140         // Order is important here: LayoutDirection MUST be resolved first
   12141         if (!isLayoutDirectionResolved()) {
   12142             resolveLayoutDirection();
   12143             resolveLayoutParams();
   12144         }
   12145         // ... then we can resolve the others properties depending on the resolved LayoutDirection.
   12146         if (!isTextDirectionResolved()) {
   12147             resolveTextDirection();
   12148         }
   12149         if (!isTextAlignmentResolved()) {
   12150             resolveTextAlignment();
   12151         }
   12152         // Should resolve Drawables before Padding because we need the layout direction of the
   12153         // Drawable to correctly resolve Padding.
   12154         if (!isDrawablesResolved()) {
   12155             resolveDrawables();
   12156         }
   12157         if (!isPaddingResolved()) {
   12158             resolvePadding();
   12159         }
   12160         onRtlPropertiesChanged(getLayoutDirection());
   12161         return true;
   12162     }
   12163 
   12164     /**
   12165      * Reset resolution of all RTL related properties.
   12166      *
   12167      * @hide
   12168      */
   12169     public void resetRtlProperties() {
   12170         resetResolvedLayoutDirection();
   12171         resetResolvedTextDirection();
   12172         resetResolvedTextAlignment();
   12173         resetResolvedPadding();
   12174         resetResolvedDrawables();
   12175     }
   12176 
   12177     /**
   12178      * @see #onScreenStateChanged(int)
   12179      */
   12180     void dispatchScreenStateChanged(int screenState) {
   12181         onScreenStateChanged(screenState);
   12182     }
   12183 
   12184     /**
   12185      * This method is called whenever the state of the screen this view is
   12186      * attached to changes. A state change will usually occurs when the screen
   12187      * turns on or off (whether it happens automatically or the user does it
   12188      * manually.)
   12189      *
   12190      * @param screenState The new state of the screen. Can be either
   12191      *                    {@link #SCREEN_STATE_ON} or {@link #SCREEN_STATE_OFF}
   12192      */
   12193     public void onScreenStateChanged(int screenState) {
   12194     }
   12195 
   12196     /**
   12197      * Return true if the application tag in the AndroidManifest has set "supportRtl" to true
   12198      */
   12199     private boolean hasRtlSupport() {
   12200         return mContext.getApplicationInfo().hasRtlSupport();
   12201     }
   12202 
   12203     /**
   12204      * Return true if we are in RTL compatibility mode (either before Jelly Bean MR1 or
   12205      * RTL not supported)
   12206      */
   12207     private boolean isRtlCompatibilityMode() {
   12208         final int targetSdkVersion = getContext().getApplicationInfo().targetSdkVersion;
   12209         return targetSdkVersion < JELLY_BEAN_MR1 || !hasRtlSupport();
   12210     }
   12211 
   12212     /**
   12213      * @return true if RTL properties need resolution.
   12214      *
   12215      */
   12216     private boolean needRtlPropertiesResolution() {
   12217         return (mPrivateFlags2 & ALL_RTL_PROPERTIES_RESOLVED) != ALL_RTL_PROPERTIES_RESOLVED;
   12218     }
   12219 
   12220     /**
   12221      * Called when any RTL property (layout direction or text direction or text alignment) has
   12222      * been changed.
   12223      *
   12224      * Subclasses need to override this method to take care of cached information that depends on the
   12225      * resolved layout direction, or to inform child views that inherit their layout direction.
   12226      *
   12227      * The default implementation does nothing.
   12228      *
   12229      * @param layoutDirection the direction of the layout
   12230      *
   12231      * @see #LAYOUT_DIRECTION_LTR
   12232      * @see #LAYOUT_DIRECTION_RTL
   12233      */
   12234     public void onRtlPropertiesChanged(int layoutDirection) {
   12235     }
   12236 
   12237     /**
   12238      * Resolve and cache the layout direction. LTR is set initially. This is implicitly supposing
   12239      * that the parent directionality can and will be resolved before its children.
   12240      *
   12241      * @return true if resolution has been done, false otherwise.
   12242      *
   12243      * @hide
   12244      */
   12245     public boolean resolveLayoutDirection() {
   12246         // Clear any previous layout direction resolution
   12247         mPrivateFlags2 &= ~PFLAG2_LAYOUT_DIRECTION_RESOLVED_MASK;
   12248 
   12249         if (hasRtlSupport()) {
   12250             // Set resolved depending on layout direction
   12251             switch ((mPrivateFlags2 & PFLAG2_LAYOUT_DIRECTION_MASK) >>
   12252                     PFLAG2_LAYOUT_DIRECTION_MASK_SHIFT) {
   12253                 case LAYOUT_DIRECTION_INHERIT:
   12254                     // We cannot resolve yet. LTR is by default and let the resolution happen again
   12255                     // later to get the correct resolved value
   12256                     if (!canResolveLayoutDirection()) return false;
   12257 
   12258                     // Parent has not yet resolved, LTR is still the default
   12259                     try {
   12260                         if (!mParent.isLayoutDirectionResolved()) return false;
   12261 
   12262                         if (mParent.getLayoutDirection() == LAYOUT_DIRECTION_RTL) {
   12263                             mPrivateFlags2 |= PFLAG2_LAYOUT_DIRECTION_RESOLVED_RTL;
   12264                         }
   12265                     } catch (AbstractMethodError e) {
   12266                         Log.e(VIEW_LOG_TAG, mParent.getClass().getSimpleName() +
   12267                                 " does not fully implement ViewParent", e);
   12268                     }
   12269                     break;
   12270                 case LAYOUT_DIRECTION_RTL:
   12271                     mPrivateFlags2 |= PFLAG2_LAYOUT_DIRECTION_RESOLVED_RTL;
   12272                     break;
   12273                 case LAYOUT_DIRECTION_LOCALE:
   12274                     if((LAYOUT_DIRECTION_RTL ==
   12275                             TextUtils.getLayoutDirectionFromLocale(Locale.getDefault()))) {
   12276                         mPrivateFlags2 |= PFLAG2_LAYOUT_DIRECTION_RESOLVED_RTL;
   12277                     }
   12278                     break;
   12279                 default:
   12280                     // Nothing to do, LTR by default
   12281             }
   12282         }
   12283 
   12284         // Set to resolved
   12285         mPrivateFlags2 |= PFLAG2_LAYOUT_DIRECTION_RESOLVED;
   12286         return true;
   12287     }
   12288 
   12289     /**
   12290      * Check if layout direction resolution can be done.
   12291      *
   12292      * @return true if layout direction resolution can be done otherwise return false.
   12293      */
   12294     public boolean canResolveLayoutDirection() {
   12295         switch (getRawLayoutDirection()) {
   12296             case LAYOUT_DIRECTION_INHERIT:
   12297                 if (mParent != null) {
   12298                     try {
   12299                         return mParent.canResolveLayoutDirection();
   12300                     } catch (AbstractMethodError e) {
   12301                         Log.e(VIEW_LOG_TAG, mParent.getClass().getSimpleName() +
   12302                                 " does not fully implement ViewParent", e);
   12303                     }
   12304                 }
   12305                 return false;
   12306 
   12307             default:
   12308                 return true;
   12309         }
   12310     }
   12311 
   12312     /**
   12313      * Reset the resolved layout direction. Layout direction will be resolved during a call to
   12314      * {@link #onMeasure(int, int)}.
   12315      *
   12316      * @hide
   12317      */
   12318     public void resetResolvedLayoutDirection() {
   12319         // Reset the current resolved bits
   12320         mPrivateFlags2 &= ~PFLAG2_LAYOUT_DIRECTION_RESOLVED_MASK;
   12321     }
   12322 
   12323     /**
   12324      * @return true if the layout direction is inherited.
   12325      *
   12326      * @hide
   12327      */
   12328     public boolean isLayoutDirectionInherited() {
   12329         return (getRawLayoutDirection() == LAYOUT_DIRECTION_INHERIT);
   12330     }
   12331 
   12332     /**
   12333      * @return true if layout direction has been resolved.
   12334      */
   12335     public boolean isLayoutDirectionResolved() {
   12336         return (mPrivateFlags2 & PFLAG2_LAYOUT_DIRECTION_RESOLVED) == PFLAG2_LAYOUT_DIRECTION_RESOLVED;
   12337     }
   12338 
   12339     /**
   12340      * Return if padding has been resolved
   12341      *
   12342      * @hide
   12343      */
   12344     boolean isPaddingResolved() {
   12345         return (mPrivateFlags2 & PFLAG2_PADDING_RESOLVED) == PFLAG2_PADDING_RESOLVED;
   12346     }
   12347 
   12348     /**
   12349      * Resolves padding depending on layout direction, if applicable, and
   12350      * recomputes internal padding values to adjust for scroll bars.
   12351      *
   12352      * @hide
   12353      */
   12354     public void resolvePadding() {
   12355         final int resolvedLayoutDirection = getLayoutDirection();
   12356 
   12357         if (!isRtlCompatibilityMode()) {
   12358             // Post Jelly Bean MR1 case: we need to take the resolved layout direction into account.
   12359             // If start / end padding are defined, they will be resolved (hence overriding) to
   12360             // left / right or right / left depending on the resolved layout direction.
   12361             // If start / end padding are not defined, use the left / right ones.
   12362             if (mBackground != null && (!mLeftPaddingDefined || !mRightPaddingDefined)) {
   12363                 Rect padding = sThreadLocal.get();
   12364                 if (padding == null) {
   12365                     padding = new Rect();
   12366                     sThreadLocal.set(padding);
   12367                 }
   12368                 mBackground.getPadding(padding);
   12369                 if (!mLeftPaddingDefined) {
   12370                     mUserPaddingLeftInitial = padding.left;
   12371                 }
   12372                 if (!mRightPaddingDefined) {
   12373                     mUserPaddingRightInitial = padding.right;
   12374                 }
   12375             }
   12376             switch (resolvedLayoutDirection) {
   12377                 case LAYOUT_DIRECTION_RTL:
   12378                     if (mUserPaddingStart != UNDEFINED_PADDING) {
   12379                         mUserPaddingRight = mUserPaddingStart;
   12380                     } else {
   12381                         mUserPaddingRight = mUserPaddingRightInitial;
   12382                     }
   12383                     if (mUserPaddingEnd != UNDEFINED_PADDING) {
   12384                         mUserPaddingLeft = mUserPaddingEnd;
   12385                     } else {
   12386                         mUserPaddingLeft = mUserPaddingLeftInitial;
   12387                     }
   12388                     break;
   12389                 case LAYOUT_DIRECTION_LTR:
   12390                 default:
   12391                     if (mUserPaddingStart != UNDEFINED_PADDING) {
   12392                         mUserPaddingLeft = mUserPaddingStart;
   12393                     } else {
   12394                         mUserPaddingLeft = mUserPaddingLeftInitial;
   12395                     }
   12396                     if (mUserPaddingEnd != UNDEFINED_PADDING) {
   12397                         mUserPaddingRight = mUserPaddingEnd;
   12398                     } else {
   12399                         mUserPaddingRight = mUserPaddingRightInitial;
   12400                     }
   12401             }
   12402 
   12403             mUserPaddingBottom = (mUserPaddingBottom >= 0) ? mUserPaddingBottom : mPaddingBottom;
   12404         }
   12405 
   12406         internalSetPadding(mUserPaddingLeft, mPaddingTop, mUserPaddingRight, mUserPaddingBottom);
   12407         onRtlPropertiesChanged(resolvedLayoutDirection);
   12408 
   12409         mPrivateFlags2 |= PFLAG2_PADDING_RESOLVED;
   12410     }
   12411 
   12412     /**
   12413      * Reset the resolved layout direction.
   12414      *
   12415      * @hide
   12416      */
   12417     public void resetResolvedPadding() {
   12418         mPrivateFlags2 &= ~PFLAG2_PADDING_RESOLVED;
   12419     }
   12420 
   12421     /**
   12422      * This is called when the view is detached from a window.  At this point it
   12423      * no longer has a surface for drawing.
   12424      *
   12425      * @see #onAttachedToWindow()
   12426      */
   12427     protected void onDetachedFromWindow() {
   12428         mPrivateFlags &= ~PFLAG_CANCEL_NEXT_UP_EVENT;
   12429         mPrivateFlags3 &= ~PFLAG3_IS_LAID_OUT;
   12430 
   12431         removeUnsetPressCallback();
   12432         removeLongPressCallback();
   12433         removePerformClickCallback();
   12434         removeSendViewScrolledAccessibilityEventCallback();
   12435 
   12436         destroyDrawingCache();
   12437         destroyLayer(false);
   12438 
   12439         cleanupDraw();
   12440 
   12441         mCurrentAnimation = null;
   12442     }
   12443 
   12444     private void cleanupDraw() {
   12445         if (mAttachInfo != null) {
   12446             if (mDisplayList != null) {
   12447                 mDisplayList.markDirty();
   12448                 mAttachInfo.mViewRootImpl.enqueueDisplayList(mDisplayList);
   12449             }
   12450             mAttachInfo.mViewRootImpl.cancelInvalidate(this);
   12451         } else {
   12452             // Should never happen
   12453             resetDisplayList();
   12454         }
   12455     }
   12456 
   12457     /**
   12458      * This method ensures the hardware renderer is in a valid state
   12459      * before executing the specified action.
   12460      *
   12461      * This method will attempt to set a valid state even if the window
   12462      * the renderer is attached to was destroyed.
   12463      *
   12464      * This method is not guaranteed to work. If the hardware renderer
   12465      * does not exist or cannot be put in a valid state, this method
   12466      * will not executed the specified action.
   12467      *
   12468      * The specified action is executed synchronously.
   12469      *
   12470      * @param action The action to execute after the renderer is in a valid state
   12471      *
   12472      * @return True if the specified Runnable was executed, false otherwise
   12473      *
   12474      * @hide
   12475      */
   12476     public boolean executeHardwareAction(Runnable action) {
   12477         //noinspection SimplifiableIfStatement
   12478         if (mAttachInfo != null && mAttachInfo.mHardwareRenderer != null) {
   12479             return mAttachInfo.mHardwareRenderer.safelyRun(action);
   12480         }
   12481         return false;
   12482     }
   12483 
   12484     void invalidateInheritedLayoutMode(int layoutModeOfRoot) {
   12485     }
   12486 
   12487     /**
   12488      * @return The number of times this view has been attached to a window
   12489      */
   12490     protected int getWindowAttachCount() {
   12491         return mWindowAttachCount;
   12492     }
   12493 
   12494     /**
   12495      * Retrieve a unique token identifying the window this view is attached to.
   12496      * @return Return the window's token for use in
   12497      * {@link WindowManager.LayoutParams#token WindowManager.LayoutParams.token}.
   12498      */
   12499     public IBinder getWindowToken() {
   12500         return mAttachInfo != null ? mAttachInfo.mWindowToken : null;
   12501     }
   12502 
   12503     /**
   12504      * Retrieve the {@link WindowId} for the window this view is
   12505      * currently attached to.
   12506      */
   12507     public WindowId getWindowId() {
   12508         if (mAttachInfo == null) {
   12509             return null;
   12510         }
   12511         if (mAttachInfo.mWindowId == null) {
   12512             try {
   12513                 mAttachInfo.mIWindowId = mAttachInfo.mSession.getWindowId(
   12514                         mAttachInfo.mWindowToken);
   12515                 mAttachInfo.mWindowId = new WindowId(
   12516                         mAttachInfo.mIWindowId);
   12517             } catch (RemoteException e) {
   12518             }
   12519         }
   12520         return mAttachInfo.mWindowId;
   12521     }
   12522 
   12523     /**
   12524      * Retrieve a unique token identifying the top-level "real" window of
   12525      * the window that this view is attached to.  That is, this is like
   12526      * {@link #getWindowToken}, except if the window this view in is a panel
   12527      * window (attached to another containing window), then the token of
   12528      * the containing window is returned instead.
   12529      *
   12530      * @return Returns the associated window token, either
   12531      * {@link #getWindowToken()} or the containing window's token.
   12532      */
   12533     public IBinder getApplicationWindowToken() {
   12534         AttachInfo ai = mAttachInfo;
   12535         if (ai != null) {
   12536             IBinder appWindowToken = ai.mPanelParentWindowToken;
   12537             if (appWindowToken == null) {
   12538                 appWindowToken = ai.mWindowToken;
   12539             }
   12540             return appWindowToken;
   12541         }
   12542         return null;
   12543     }
   12544 
   12545     /**
   12546      * Gets the logical display to which the view's window has been attached.
   12547      *
   12548      * @return The logical display, or null if the view is not currently attached to a window.
   12549      */
   12550     public Display getDisplay() {
   12551         return mAttachInfo != null ? mAttachInfo.mDisplay : null;
   12552     }
   12553 
   12554     /**
   12555      * Retrieve private session object this view hierarchy is using to
   12556      * communicate with the window manager.
   12557      * @return the session object to communicate with the window manager
   12558      */
   12559     /*package*/ IWindowSession getWindowSession() {
   12560         return mAttachInfo != null ? mAttachInfo.mSession : null;
   12561     }
   12562 
   12563     /**
   12564      * @param info the {@link android.view.View.AttachInfo} to associated with
   12565      *        this view
   12566      */
   12567     void dispatchAttachedToWindow(AttachInfo info, int visibility) {
   12568         //System.out.println("Attached! " + this);
   12569         mAttachInfo = info;
   12570         if (mOverlay != null) {
   12571             mOverlay.getOverlayView().dispatchAttachedToWindow(info, visibility);
   12572         }
   12573         mWindowAttachCount++;
   12574         // We will need to evaluate the drawable state at least once.
   12575         mPrivateFlags |= PFLAG_DRAWABLE_STATE_DIRTY;
   12576         if (mFloatingTreeObserver != null) {
   12577             info.mTreeObserver.merge(mFloatingTreeObserver);
   12578             mFloatingTreeObserver = null;
   12579         }
   12580         if ((mPrivateFlags&PFLAG_SCROLL_CONTAINER) != 0) {
   12581             mAttachInfo.mScrollContainers.add(this);
   12582             mPrivateFlags |= PFLAG_SCROLL_CONTAINER_ADDED;
   12583         }
   12584         performCollectViewAttributes(mAttachInfo, visibility);
   12585         onAttachedToWindow();
   12586 
   12587         ListenerInfo li = mListenerInfo;
   12588         final CopyOnWriteArrayList<OnAttachStateChangeListener> listeners =
   12589                 li != null ? li.mOnAttachStateChangeListeners : null;
   12590         if (listeners != null && listeners.size() > 0) {
   12591             // NOTE: because of the use of CopyOnWriteArrayList, we *must* use an iterator to
   12592             // perform the dispatching. The iterator is a safe guard against listeners that
   12593             // could mutate the list by calling the various add/remove methods. This prevents
   12594             // the array from being modified while we iterate it.
   12595             for (OnAttachStateChangeListener listener : listeners) {
   12596                 listener.onViewAttachedToWindow(this);
   12597             }
   12598         }
   12599 
   12600         int vis = info.mWindowVisibility;
   12601         if (vis != GONE) {
   12602             onWindowVisibilityChanged(vis);
   12603         }
   12604         if ((mPrivateFlags&PFLAG_DRAWABLE_STATE_DIRTY) != 0) {
   12605             // If nobody has evaluated the drawable state yet, then do it now.
   12606             refreshDrawableState();
   12607         }
   12608         needGlobalAttributesUpdate(false);
   12609     }
   12610 
   12611     void dispatchDetachedFromWindow() {
   12612         AttachInfo info = mAttachInfo;
   12613         if (info != null) {
   12614             int vis = info.mWindowVisibility;
   12615             if (vis != GONE) {
   12616                 onWindowVisibilityChanged(GONE);
   12617             }
   12618         }
   12619 
   12620         onDetachedFromWindow();
   12621 
   12622         ListenerInfo li = mListenerInfo;
   12623         final CopyOnWriteArrayList<OnAttachStateChangeListener> listeners =
   12624                 li != null ? li.mOnAttachStateChangeListeners : null;
   12625         if (listeners != null && listeners.size() > 0) {
   12626             // NOTE: because of the use of CopyOnWriteArrayList, we *must* use an iterator to
   12627             // perform the dispatching. The iterator is a safe guard against listeners that
   12628             // could mutate the list by calling the various add/remove methods. This prevents
   12629             // the array from being modified while we iterate it.
   12630             for (OnAttachStateChangeListener listener : listeners) {
   12631                 listener.onViewDetachedFromWindow(this);
   12632             }
   12633         }
   12634 
   12635         if ((mPrivateFlags & PFLAG_SCROLL_CONTAINER_ADDED) != 0) {
   12636             mAttachInfo.mScrollContainers.remove(this);
   12637             mPrivateFlags &= ~PFLAG_SCROLL_CONTAINER_ADDED;
   12638         }
   12639 
   12640         mAttachInfo = null;
   12641         if (mOverlay != null) {
   12642             mOverlay.getOverlayView().dispatchDetachedFromWindow();
   12643         }
   12644     }
   12645 
   12646     /**
   12647      * Cancel any deferred high-level input events that were previously posted to the event queue.
   12648      *
   12649      * <p>Many views post high-level events such as click handlers to the event queue
   12650      * to run deferred in order to preserve a desired user experience - clearing visible
   12651      * pressed states before executing, etc. This method will abort any events of this nature
   12652      * that are currently in flight.</p>
   12653      *
   12654      * <p>Custom views that generate their own high-level deferred input events should override
   12655      * {@link #onCancelPendingInputEvents()} and remove those pending events from the queue.</p>
   12656      *
   12657      * <p>This will also cancel pending input events for any child views.</p>
   12658      *
   12659      * <p>Note that this may not be sufficient as a debouncing strategy for clicks in all cases.
   12660      * This will not impact newer events posted after this call that may occur as a result of
   12661      * lower-level input events still waiting in the queue. If you are trying to prevent
   12662      * double-submitted  events for the duration of some sort of asynchronous transaction
   12663      * you should also take other steps to protect against unexpected double inputs e.g. calling
   12664      * {@link #setEnabled(boolean) setEnabled(false)} and re-enabling the view when
   12665      * the transaction completes, tracking already submitted transaction IDs, etc.</p>
   12666      */
   12667     public final void cancelPendingInputEvents() {
   12668         dispatchCancelPendingInputEvents();
   12669     }
   12670 
   12671     /**
   12672      * Called by {@link #cancelPendingInputEvents()} to cancel input events in flight.
   12673      * Overridden by ViewGroup to dispatch. Package scoped to prevent app-side meddling.
   12674      */
   12675     void dispatchCancelPendingInputEvents() {
   12676         mPrivateFlags3 &= ~PFLAG3_CALLED_SUPER;
   12677         onCancelPendingInputEvents();
   12678         if ((mPrivateFlags3 & PFLAG3_CALLED_SUPER) != PFLAG3_CALLED_SUPER) {
   12679             throw new SuperNotCalledException("View " + getClass().getSimpleName() +
   12680                     " did not call through to super.onCancelPendingInputEvents()");
   12681         }
   12682     }
   12683 
   12684     /**
   12685      * Called as the result of a call to {@link #cancelPendingInputEvents()} on this view or
   12686      * a parent view.
   12687      *
   12688      * <p>This method is responsible for removing any pending high-level input events that were
   12689      * posted to the event queue to run later. Custom view classes that post their own deferred
   12690      * high-level events via {@link #post(Runnable)}, {@link #postDelayed(Runnable, long)} or
   12691      * {@link android.os.Handler} should override this method, call
   12692      * <code>super.onCancelPendingInputEvents()</code> and remove those callbacks as appropriate.
   12693      * </p>
   12694      */
   12695     public void onCancelPendingInputEvents() {
   12696         removePerformClickCallback();
   12697         cancelLongPress();
   12698         mPrivateFlags3 |= PFLAG3_CALLED_SUPER;
   12699     }
   12700 
   12701     /**
   12702      * Store this view hierarchy's frozen state into the given container.
   12703      *
   12704      * @param container The SparseArray in which to save the view's state.
   12705      *
   12706      * @see #restoreHierarchyState(android.util.SparseArray)
   12707      * @see #dispatchSaveInstanceState(android.util.SparseArray)
   12708      * @see #onSaveInstanceState()
   12709      */
   12710     public void saveHierarchyState(SparseArray<Parcelable> container) {
   12711         dispatchSaveInstanceState(container);
   12712     }
   12713 
   12714     /**
   12715      * Called by {@link #saveHierarchyState(android.util.SparseArray)} to store the state for
   12716      * this view and its children. May be overridden to modify how freezing happens to a
   12717      * view's children; for example, some views may want to not store state for their children.
   12718      *
   12719      * @param container The SparseArray in which to save the view's state.
   12720      *
   12721      * @see #dispatchRestoreInstanceState(android.util.SparseArray)
   12722      * @see #saveHierarchyState(android.util.SparseArray)
   12723      * @see #onSaveInstanceState()
   12724      */
   12725     protected void dispatchSaveInstanceState(SparseArray<Parcelable> container) {
   12726         if (mID != NO_ID && (mViewFlags & SAVE_DISABLED_MASK) == 0) {
   12727             mPrivateFlags &= ~PFLAG_SAVE_STATE_CALLED;
   12728             Parcelable state = onSaveInstanceState();
   12729             if ((mPrivateFlags & PFLAG_SAVE_STATE_CALLED) == 0) {
   12730                 throw new IllegalStateException(
   12731                         "Derived class did not call super.onSaveInstanceState()");
   12732             }
   12733             if (state != null) {
   12734                 // Log.i("View", "Freezing #" + Integer.toHexString(mID)
   12735                 // + ": " + state);
   12736                 container.put(mID, state);
   12737             }
   12738         }
   12739     }
   12740 
   12741     /**
   12742      * Hook allowing a view to generate a representation of its internal state
   12743      * that can later be used to create a new instance with that same state.
   12744      * This state should only contain information that is not persistent or can
   12745      * not be reconstructed later. For example, you will never store your
   12746      * current position on screen because that will be computed again when a
   12747      * new instance of the view is placed in its view hierarchy.
   12748      * <p>
   12749      * Some examples of things you may store here: the current cursor position
   12750      * in a text view (but usually not the text itself since that is stored in a
   12751      * content provider or other persistent storage), the currently selected
   12752      * item in a list view.
   12753      *
   12754      * @return Returns a Parcelable object containing the view's current dynamic
   12755      *         state, or null if there is nothing interesting to save. The
   12756      *         default implementation returns null.
   12757      * @see #onRestoreInstanceState(android.os.Parcelable)
   12758      * @see #saveHierarchyState(android.util.SparseArray)
   12759      * @see #dispatchSaveInstanceState(android.util.SparseArray)
   12760      * @see #setSaveEnabled(boolean)
   12761      */
   12762     protected Parcelable onSaveInstanceState() {
   12763         mPrivateFlags |= PFLAG_SAVE_STATE_CALLED;
   12764         return BaseSavedState.EMPTY_STATE;
   12765     }
   12766 
   12767     /**
   12768      * Restore this view hierarchy's frozen state from the given container.
   12769      *
   12770      * @param container The SparseArray which holds previously frozen states.
   12771      *
   12772      * @see #saveHierarchyState(android.util.SparseArray)
   12773      * @see #dispatchRestoreInstanceState(android.util.SparseArray)
   12774      * @see #onRestoreInstanceState(android.os.Parcelable)
   12775      */
   12776     public void restoreHierarchyState(SparseArray<Parcelable> container) {
   12777         dispatchRestoreInstanceState(container);
   12778     }
   12779 
   12780     /**
   12781      * Called by {@link #restoreHierarchyState(android.util.SparseArray)} to retrieve the
   12782      * state for this view and its children. May be overridden to modify how restoring
   12783      * happens to a view's children; for example, some views may want to not store state
   12784      * for their children.
   12785      *
   12786      * @param container The SparseArray which holds previously saved state.
   12787      *
   12788      * @see #dispatchSaveInstanceState(android.util.SparseArray)
   12789      * @see #restoreHierarchyState(android.util.SparseArray)
   12790      * @see #onRestoreInstanceState(android.os.Parcelable)
   12791      */
   12792     protected void dispatchRestoreInstanceState(SparseArray<Parcelable> container) {
   12793         if (mID != NO_ID) {
   12794             Parcelable state = container.get(mID);
   12795             if (state != null) {
   12796                 // Log.i("View", "Restoreing #" + Integer.toHexString(mID)
   12797                 // + ": " + state);
   12798                 mPrivateFlags &= ~PFLAG_SAVE_STATE_CALLED;
   12799                 onRestoreInstanceState(state);
   12800                 if ((mPrivateFlags & PFLAG_SAVE_STATE_CALLED) == 0) {
   12801                     throw new IllegalStateException(
   12802                             "Derived class did not call super.onRestoreInstanceState()");
   12803                 }
   12804             }
   12805         }
   12806     }
   12807 
   12808     /**
   12809      * Hook allowing a view to re-apply a representation of its internal state that had previously
   12810      * been generated by {@link #onSaveInstanceState}. This function will never be called with a
   12811      * null state.
   12812      *
   12813      * @param state The frozen state that had previously been returned by
   12814      *        {@link #onSaveInstanceState}.
   12815      *
   12816      * @see #onSaveInstanceState()
   12817      * @see #restoreHierarchyState(android.util.SparseArray)
   12818      * @see #dispatchRestoreInstanceState(android.util.SparseArray)
   12819      */
   12820     protected void onRestoreInstanceState(Parcelable state) {
   12821         mPrivateFlags |= PFLAG_SAVE_STATE_CALLED;
   12822         if (state != BaseSavedState.EMPTY_STATE && state != null) {
   12823             throw new IllegalArgumentException("Wrong state class, expecting View State but "
   12824                     + "received " + state.getClass().toString() + " instead. This usually happens "
   12825                     + "when two views of different type have the same id in the same hierarchy. "
   12826                     + "This view's id is " + ViewDebug.resolveId(mContext, getId()) + ". Make sure "
   12827                     + "other views do not use the same id.");
   12828         }
   12829     }
   12830 
   12831     /**
   12832      * <p>Return the time at which the drawing of the view hierarchy started.</p>
   12833      *
   12834      * @return the drawing start time in milliseconds
   12835      */
   12836     public long getDrawingTime() {
   12837         return mAttachInfo != null ? mAttachInfo.mDrawingTime : 0;
   12838     }
   12839 
   12840     /**
   12841      * <p>Enables or disables the duplication of the parent's state into this view. When
   12842      * duplication is enabled, this view gets its drawable state from its parent rather
   12843      * than from its own internal properties.</p>
   12844      *
   12845      * <p>Note: in the current implementation, setting this property to true after the
   12846      * view was added to a ViewGroup might have no effect at all. This property should
   12847      * always be used from XML or set to true before adding this view to a ViewGroup.</p>
   12848      *
   12849      * <p>Note: if this view's parent addStateFromChildren property is enabled and this
   12850      * property is enabled, an exception will be thrown.</p>
   12851      *
   12852      * <p>Note: if the child view uses and updates additionnal states which are unknown to the
   12853      * parent, these states should not be affected by this method.</p>
   12854      *
   12855      * @param enabled True to enable duplication of the parent's drawable state, false
   12856      *                to disable it.
   12857      *
   12858      * @see #getDrawableState()
   12859      * @see #isDuplicateParentStateEnabled()
   12860      */
   12861     public void setDuplicateParentStateEnabled(boolean enabled) {
   12862         setFlags(enabled ? DUPLICATE_PARENT_STATE : 0, DUPLICATE_PARENT_STATE);
   12863     }
   12864 
   12865     /**
   12866      * <p>Indicates whether this duplicates its drawable state from its parent.</p>
   12867      *
   12868      * @return True if this view's drawable state is duplicated from the parent,
   12869      *         false otherwise
   12870      *
   12871      * @see #getDrawableState()
   12872      * @see #setDuplicateParentStateEnabled(boolean)
   12873      */
   12874     public boolean isDuplicateParentStateEnabled() {
   12875         return (mViewFlags & DUPLICATE_PARENT_STATE) == DUPLICATE_PARENT_STATE;
   12876     }
   12877 
   12878     /**
   12879      * <p>Specifies the type of layer backing this view. The layer can be
   12880      * {@link #LAYER_TYPE_NONE}, {@link #LAYER_TYPE_SOFTWARE} or
   12881      * {@link #LAYER_TYPE_HARDWARE}.</p>
   12882      *
   12883      * <p>A layer is associated with an optional {@link android.graphics.Paint}
   12884      * instance that controls how the layer is composed on screen. The following
   12885      * properties of the paint are taken into account when composing the layer:</p>
   12886      * <ul>
   12887      * <li>{@link android.graphics.Paint#getAlpha() Translucency (alpha)}</li>
   12888      * <li>{@link android.graphics.Paint#getXfermode() Blending mode}</li>
   12889      * <li>{@link android.graphics.Paint#getColorFilter() Color filter}</li>
   12890      * </ul>
   12891      *
   12892      * <p>If this view has an alpha value set to < 1.0 by calling
   12893      * {@link #setAlpha(float)}, the alpha value of the layer's paint is superceded
   12894      * by this view's alpha value.</p>
   12895      *
   12896      * <p>Refer to the documentation of {@link #LAYER_TYPE_NONE},
   12897      * {@link #LAYER_TYPE_SOFTWARE} and {@link #LAYER_TYPE_HARDWARE}
   12898      * for more information on when and how to use layers.</p>
   12899      *
   12900      * @param layerType The type of layer to use with this view, must be one of
   12901      *        {@link #LAYER_TYPE_NONE}, {@link #LAYER_TYPE_SOFTWARE} or
   12902      *        {@link #LAYER_TYPE_HARDWARE}
   12903      * @param paint The paint used to compose the layer. This argument is optional
   12904      *        and can be null. It is ignored when the layer type is
   12905      *        {@link #LAYER_TYPE_NONE}
   12906      *
   12907      * @see #getLayerType()
   12908      * @see #LAYER_TYPE_NONE
   12909      * @see #LAYER_TYPE_SOFTWARE
   12910      * @see #LAYER_TYPE_HARDWARE
   12911      * @see #setAlpha(float)
   12912      *
   12913      * @attr ref android.R.styleable#View_layerType
   12914      */
   12915     public void setLayerType(int layerType, Paint paint) {
   12916         if (layerType < LAYER_TYPE_NONE || layerType > LAYER_TYPE_HARDWARE) {
   12917             throw new IllegalArgumentException("Layer type can only be one of: LAYER_TYPE_NONE, "
   12918                     + "LAYER_TYPE_SOFTWARE or LAYER_TYPE_HARDWARE");
   12919         }
   12920 
   12921         if (layerType == mLayerType) {
   12922             if (layerType != LAYER_TYPE_NONE && paint != mLayerPaint) {
   12923                 mLayerPaint = paint == null ? new Paint() : paint;
   12924                 invalidateParentCaches();
   12925                 invalidate(true);
   12926             }
   12927             return;
   12928         }
   12929 
   12930         // Destroy any previous software drawing cache if needed
   12931         switch (mLayerType) {
   12932             case LAYER_TYPE_HARDWARE:
   12933                 destroyLayer(false);
   12934                 // fall through - non-accelerated views may use software layer mechanism instead
   12935             case LAYER_TYPE_SOFTWARE:
   12936                 destroyDrawingCache();
   12937                 break;
   12938             default:
   12939                 break;
   12940         }
   12941 
   12942         mLayerType = layerType;
   12943         final boolean layerDisabled = mLayerType == LAYER_TYPE_NONE;
   12944         mLayerPaint = layerDisabled ? null : (paint == null ? new Paint() : paint);
   12945         mLocalDirtyRect = layerDisabled ? null : new Rect();
   12946 
   12947         invalidateParentCaches();
   12948         invalidate(true);
   12949     }
   12950 
   12951     /**
   12952      * Updates the {@link Paint} object used with the current layer (used only if the current
   12953      * layer type is not set to {@link #LAYER_TYPE_NONE}). Changed properties of the Paint
   12954      * provided to {@link #setLayerType(int, android.graphics.Paint)} will be used the next time
   12955      * the View is redrawn, but {@link #setLayerPaint(android.graphics.Paint)} must be called to
   12956      * ensure that the view gets redrawn immediately.
   12957      *
   12958      * <p>A layer is associated with an optional {@link android.graphics.Paint}
   12959      * instance that controls how the layer is composed on screen. The following
   12960      * properties of the paint are taken into account when composing the layer:</p>
   12961      * <ul>
   12962      * <li>{@link android.graphics.Paint#getAlpha() Translucency (alpha)}</li>
   12963      * <li>{@link android.graphics.Paint#getXfermode() Blending mode}</li>
   12964      * <li>{@link android.graphics.Paint#getColorFilter() Color filter}</li>
   12965      * </ul>
   12966      *
   12967      * <p>If this view has an alpha value set to < 1.0 by calling {@link #setAlpha(float)}, the
   12968      * alpha value of the layer's paint is superceded by this view's alpha value.</p>
   12969      *
   12970      * @param paint The paint used to compose the layer. This argument is optional
   12971      *        and can be null. It is ignored when the layer type is
   12972      *        {@link #LAYER_TYPE_NONE}
   12973      *
   12974      * @see #setLayerType(int, android.graphics.Paint)
   12975      */
   12976     public void setLayerPaint(Paint paint) {
   12977         int layerType = getLayerType();
   12978         if (layerType != LAYER_TYPE_NONE) {
   12979             mLayerPaint = paint == null ? new Paint() : paint;
   12980             if (layerType == LAYER_TYPE_HARDWARE) {
   12981                 HardwareLayer layer = getHardwareLayer();
   12982                 if (layer != null) {
   12983                     layer.setLayerPaint(paint);
   12984                 }
   12985                 invalidateViewProperty(false, false);
   12986             } else {
   12987                 invalidate();
   12988             }
   12989         }
   12990     }
   12991 
   12992     /**
   12993      * Indicates whether this view has a static layer. A view with layer type
   12994      * {@link #LAYER_TYPE_NONE} is a static layer. Other types of layers are
   12995      * dynamic.
   12996      */
   12997     boolean hasStaticLayer() {
   12998         return true;
   12999     }
   13000 
   13001     /**
   13002      * Indicates what type of layer is currently associated with this view. By default
   13003      * a view does not have a layer, and the layer type is {@link #LAYER_TYPE_NONE}.
   13004      * Refer to the documentation of {@link #setLayerType(int, android.graphics.Paint)}
   13005      * for more information on the different types of layers.
   13006      *
   13007      * @return {@link #LAYER_TYPE_NONE}, {@link #LAYER_TYPE_SOFTWARE} or
   13008      *         {@link #LAYER_TYPE_HARDWARE}
   13009      *
   13010      * @see #setLayerType(int, android.graphics.Paint)
   13011      * @see #buildLayer()
   13012      * @see #LAYER_TYPE_NONE
   13013      * @see #LAYER_TYPE_SOFTWARE
   13014      * @see #LAYER_TYPE_HARDWARE
   13015      */
   13016     public int getLayerType() {
   13017         return mLayerType;
   13018     }
   13019 
   13020     /**
   13021      * Forces this view's layer to be created and this view to be rendered
   13022      * into its layer. If this view's layer type is set to {@link #LAYER_TYPE_NONE},
   13023      * invoking this method will have no effect.
   13024      *
   13025      * This method can for instance be used to render a view into its layer before
   13026      * starting an animation. If this view is complex, rendering into the layer
   13027      * before starting the animation will avoid skipping frames.
   13028      *
   13029      * @throws IllegalStateException If this view is not attached to a window
   13030      *
   13031      * @see #setLayerType(int, android.graphics.Paint)
   13032      */
   13033     public void buildLayer() {
   13034         if (mLayerType == LAYER_TYPE_NONE) return;
   13035 
   13036         final AttachInfo attachInfo = mAttachInfo;
   13037         if (attachInfo == null) {
   13038             throw new IllegalStateException("This view must be attached to a window first");
   13039         }
   13040 
   13041         switch (mLayerType) {
   13042             case LAYER_TYPE_HARDWARE:
   13043                 if (attachInfo.mHardwareRenderer != null &&
   13044                         attachInfo.mHardwareRenderer.isEnabled() &&
   13045                         attachInfo.mHardwareRenderer.validate()) {
   13046                     getHardwareLayer();
   13047                     // TODO: We need a better way to handle this case
   13048                     // If views have registered pre-draw listeners they need
   13049                     // to be notified before we build the layer. Those listeners
   13050                     // may however rely on other events to happen first so we
   13051                     // cannot just invoke them here until they don't cancel the
   13052                     // current frame
   13053                     if (!attachInfo.mTreeObserver.hasOnPreDrawListeners()) {
   13054                         attachInfo.mViewRootImpl.dispatchFlushHardwareLayerUpdates();
   13055                     }
   13056                 }
   13057                 break;
   13058             case LAYER_TYPE_SOFTWARE:
   13059                 buildDrawingCache(true);
   13060                 break;
   13061         }
   13062     }
   13063 
   13064     /**
   13065      * <p>Returns a hardware layer that can be used to draw this view again
   13066      * without executing its draw method.</p>
   13067      *
   13068      * @return A HardwareLayer ready to render, or null if an error occurred.
   13069      */
   13070     HardwareLayer getHardwareLayer() {
   13071         if (mAttachInfo == null || mAttachInfo.mHardwareRenderer == null ||
   13072                 !mAttachInfo.mHardwareRenderer.isEnabled()) {
   13073             return null;
   13074         }
   13075 
   13076         if (!mAttachInfo.mHardwareRenderer.validate()) return null;
   13077 
   13078         final int width = mRight - mLeft;
   13079         final int height = mBottom - mTop;
   13080 
   13081         if (width == 0 || height == 0) {
   13082             return null;
   13083         }
   13084 
   13085         if ((mPrivateFlags & PFLAG_DRAWING_CACHE_VALID) == 0 || mHardwareLayer == null) {
   13086             if (mHardwareLayer == null) {
   13087                 mHardwareLayer = mAttachInfo.mHardwareRenderer.createHardwareLayer(
   13088                         width, height, isOpaque());
   13089                 mLocalDirtyRect.set(0, 0, width, height);
   13090             } else {
   13091                 if (mHardwareLayer.getWidth() != width || mHardwareLayer.getHeight() != height) {
   13092                     if (mHardwareLayer.resize(width, height)) {
   13093                         mLocalDirtyRect.set(0, 0, width, height);
   13094                     }
   13095                 }
   13096 
   13097                 // This should not be necessary but applications that change
   13098                 // the parameters of their background drawable without calling
   13099                 // this.setBackground(Drawable) can leave the view in a bad state
   13100                 // (for instance isOpaque() returns true, but the background is
   13101                 // not opaque.)
   13102                 computeOpaqueFlags();
   13103 
   13104                 final boolean opaque = isOpaque();
   13105                 if (mHardwareLayer.isValid() && mHardwareLayer.isOpaque() != opaque) {
   13106                     mHardwareLayer.setOpaque(opaque);
   13107                     mLocalDirtyRect.set(0, 0, width, height);
   13108                 }
   13109             }
   13110 
   13111             // The layer is not valid if the underlying GPU resources cannot be allocated
   13112             if (!mHardwareLayer.isValid()) {
   13113                 return null;
   13114             }
   13115 
   13116             mHardwareLayer.setLayerPaint(mLayerPaint);
   13117             mHardwareLayer.redrawLater(getHardwareLayerDisplayList(mHardwareLayer), mLocalDirtyRect);
   13118             ViewRootImpl viewRoot = getViewRootImpl();
   13119             if (viewRoot != null) viewRoot.pushHardwareLayerUpdate(mHardwareLayer);
   13120 
   13121             mLocalDirtyRect.setEmpty();
   13122         }
   13123 
   13124         return mHardwareLayer;
   13125     }
   13126 
   13127     /**
   13128      * Destroys this View's hardware layer if possible.
   13129      *
   13130      * @return True if the layer was destroyed, false otherwise.
   13131      *
   13132      * @see #setLayerType(int, android.graphics.Paint)
   13133      * @see #LAYER_TYPE_HARDWARE
   13134      */
   13135     boolean destroyLayer(boolean valid) {
   13136         if (mHardwareLayer != null) {
   13137             AttachInfo info = mAttachInfo;
   13138             if (info != null && info.mHardwareRenderer != null &&
   13139                     info.mHardwareRenderer.isEnabled() &&
   13140                     (valid || info.mHardwareRenderer.validate())) {
   13141 
   13142                 info.mHardwareRenderer.cancelLayerUpdate(mHardwareLayer);
   13143                 mHardwareLayer.destroy();
   13144                 mHardwareLayer = null;
   13145 
   13146                 invalidate(true);
   13147                 invalidateParentCaches();
   13148             }
   13149             return true;
   13150         }
   13151         return false;
   13152     }
   13153 
   13154     /**
   13155      * Destroys all hardware rendering resources. This method is invoked
   13156      * when the system needs to reclaim resources. Upon execution of this
   13157      * method, you should free any OpenGL resources created by the view.
   13158      *
   13159      * Note: you <strong>must</strong> call
   13160      * <code>super.destroyHardwareResources()</code> when overriding
   13161      * this method.
   13162      *
   13163      * @hide
   13164      */
   13165     protected void destroyHardwareResources() {
   13166         resetDisplayList();
   13167         destroyLayer(true);
   13168     }
   13169 
   13170     /**
   13171      * <p>Enables or disables the drawing cache. When the drawing cache is enabled, the next call
   13172      * to {@link #getDrawingCache()} or {@link #buildDrawingCache()} will draw the view in a
   13173      * bitmap. Calling {@link #draw(android.graphics.Canvas)} will not draw from the cache when
   13174      * the cache is enabled. To benefit from the cache, you must request the drawing cache by
   13175      * calling {@link #getDrawingCache()} and draw it on screen if the returned bitmap is not
   13176      * null.</p>
   13177      *
   13178      * <p>Enabling the drawing cache is similar to
   13179      * {@link #setLayerType(int, android.graphics.Paint) setting a layer} when hardware
   13180      * acceleration is turned off. When hardware acceleration is turned on, enabling the
   13181      * drawing cache has no effect on rendering because the system uses a different mechanism
   13182      * for acceleration which ignores the flag. If you want to use a Bitmap for the view, even
   13183      * when hardware acceleration is enabled, see {@link #setLayerType(int, android.graphics.Paint)}
   13184      * for information on how to enable software and hardware layers.</p>
   13185      *
   13186      * <p>This API can be used to manually generate
   13187      * a bitmap copy of this view, by setting the flag to <code>true</code> and calling
   13188      * {@link #getDrawingCache()}.</p>
   13189      *
   13190      * @param enabled true to enable the drawing cache, false otherwise
   13191      *
   13192      * @see #isDrawingCacheEnabled()
   13193      * @see #getDrawingCache()
   13194      * @see #buildDrawingCache()
   13195      * @see #setLayerType(int, android.graphics.Paint)
   13196      */
   13197     public void setDrawingCacheEnabled(boolean enabled) {
   13198         mCachingFailed = false;
   13199         setFlags(enabled ? DRAWING_CACHE_ENABLED : 0, DRAWING_CACHE_ENABLED);
   13200     }
   13201 
   13202     /**
   13203      * <p>Indicates whether the drawing cache is enabled for this view.</p>
   13204      *
   13205      * @return true if the drawing cache is enabled
   13206      *
   13207      * @see #setDrawingCacheEnabled(boolean)
   13208      * @see #getDrawingCache()
   13209      */
   13210     @ViewDebug.ExportedProperty(category = "drawing")
   13211     public boolean isDrawingCacheEnabled() {
   13212         return (mViewFlags & DRAWING_CACHE_ENABLED) == DRAWING_CACHE_ENABLED;
   13213     }
   13214 
   13215     /**
   13216      * Debugging utility which recursively outputs the dirty state of a view and its
   13217      * descendants.
   13218      *
   13219      * @hide
   13220      */
   13221     @SuppressWarnings({"UnusedDeclaration"})
   13222     public void outputDirtyFlags(String indent, boolean clear, int clearMask) {
   13223         Log.d("View", indent + this + "             DIRTY(" + (mPrivateFlags & View.PFLAG_DIRTY_MASK) +
   13224                 ") DRAWN(" + (mPrivateFlags & PFLAG_DRAWN) + ")" + " CACHE_VALID(" +
   13225                 (mPrivateFlags & View.PFLAG_DRAWING_CACHE_VALID) +
   13226                 ") INVALIDATED(" + (mPrivateFlags & PFLAG_INVALIDATED) + ")");
   13227         if (clear) {
   13228             mPrivateFlags &= clearMask;
   13229         }
   13230         if (this instanceof ViewGroup) {
   13231             ViewGroup parent = (ViewGroup) this;
   13232             final int count = parent.getChildCount();
   13233             for (int i = 0; i < count; i++) {
   13234                 final View child = parent.getChildAt(i);
   13235                 child.outputDirtyFlags(indent + "  ", clear, clearMask);
   13236             }
   13237         }
   13238     }
   13239 
   13240     /**
   13241      * This method is used by ViewGroup to cause its children to restore or recreate their
   13242      * display lists. It is called by getDisplayList() when the parent ViewGroup does not need
   13243      * to recreate its own display list, which would happen if it went through the normal
   13244      * draw/dispatchDraw mechanisms.
   13245      *
   13246      * @hide
   13247      */
   13248     protected void dispatchGetDisplayList() {}
   13249 
   13250     /**
   13251      * A view that is not attached or hardware accelerated cannot create a display list.
   13252      * This method checks these conditions and returns the appropriate result.
   13253      *
   13254      * @return true if view has the ability to create a display list, false otherwise.
   13255      *
   13256      * @hide
   13257      */
   13258     public boolean canHaveDisplayList() {
   13259         return !(mAttachInfo == null || mAttachInfo.mHardwareRenderer == null);
   13260     }
   13261 
   13262     /**
   13263      * @return The {@link HardwareRenderer} associated with that view or null if
   13264      *         hardware rendering is not supported or this view is not attached
   13265      *         to a window.
   13266      *
   13267      * @hide
   13268      */
   13269     public HardwareRenderer getHardwareRenderer() {
   13270         if (mAttachInfo != null) {
   13271             return mAttachInfo.mHardwareRenderer;
   13272         }
   13273         return null;
   13274     }
   13275 
   13276     /**
   13277      * Returns a DisplayList. If the incoming displayList is null, one will be created.
   13278      * Otherwise, the same display list will be returned (after having been rendered into
   13279      * along the way, depending on the invalidation state of the view).
   13280      *
   13281      * @param displayList The previous version of this displayList, could be null.
   13282      * @param isLayer Whether the requester of the display list is a layer. If so,
   13283      * the view will avoid creating a layer inside the resulting display list.
   13284      * @return A new or reused DisplayList object.
   13285      */
   13286     private DisplayList getDisplayList(DisplayList displayList, boolean isLayer) {
   13287         if (!canHaveDisplayList()) {
   13288             return null;
   13289         }
   13290 
   13291         if (((mPrivateFlags & PFLAG_DRAWING_CACHE_VALID) == 0 ||
   13292                 displayList == null || !displayList.isValid() ||
   13293                 (!isLayer && mRecreateDisplayList))) {
   13294             // Don't need to recreate the display list, just need to tell our
   13295             // children to restore/recreate theirs
   13296             if (displayList != null && displayList.isValid() &&
   13297                     !isLayer && !mRecreateDisplayList) {
   13298                 mPrivateFlags |= PFLAG_DRAWN | PFLAG_DRAWING_CACHE_VALID;
   13299                 mPrivateFlags &= ~PFLAG_DIRTY_MASK;
   13300                 dispatchGetDisplayList();
   13301 
   13302                 return displayList;
   13303             }
   13304 
   13305             if (!isLayer) {
   13306                 // If we got here, we're recreating it. Mark it as such to ensure that
   13307                 // we copy in child display lists into ours in drawChild()
   13308                 mRecreateDisplayList = true;
   13309             }
   13310             if (displayList == null) {
   13311                 displayList = mAttachInfo.mHardwareRenderer.createDisplayList(getClass().getName());
   13312                 // If we're creating a new display list, make sure our parent gets invalidated
   13313                 // since they will need to recreate their display list to account for this
   13314                 // new child display list.
   13315                 invalidateParentCaches();
   13316             }
   13317 
   13318             boolean caching = false;
   13319             int width = mRight - mLeft;
   13320             int height = mBottom - mTop;
   13321             int layerType = getLayerType();
   13322 
   13323             final HardwareCanvas canvas = displayList.start(width, height);
   13324 
   13325             try {
   13326                 if (!isLayer && layerType != LAYER_TYPE_NONE) {
   13327                     if (layerType == LAYER_TYPE_HARDWARE) {
   13328                         final HardwareLayer layer = getHardwareLayer();
   13329                         if (layer != null && layer.isValid()) {
   13330                             canvas.drawHardwareLayer(layer, 0, 0, mLayerPaint);
   13331                         } else {
   13332                             canvas.saveLayer(0, 0, mRight - mLeft, mBottom - mTop, mLayerPaint,
   13333                                     Canvas.HAS_ALPHA_LAYER_SAVE_FLAG |
   13334                                             Canvas.CLIP_TO_LAYER_SAVE_FLAG);
   13335                         }
   13336                         caching = true;
   13337                     } else {
   13338                         buildDrawingCache(true);
   13339                         Bitmap cache = getDrawingCache(true);
   13340                         if (cache != null) {
   13341                             canvas.drawBitmap(cache, 0, 0, mLayerPaint);
   13342                             caching = true;
   13343                         }
   13344                     }
   13345                 } else {
   13346 
   13347                     computeScroll();
   13348 
   13349                     canvas.translate(-mScrollX, -mScrollY);
   13350                     if (!isLayer) {
   13351                         mPrivateFlags |= PFLAG_DRAWN | PFLAG_DRAWING_CACHE_VALID;
   13352                         mPrivateFlags &= ~PFLAG_DIRTY_MASK;
   13353                     }
   13354 
   13355                     // Fast path for layouts with no backgrounds
   13356                     if ((mPrivateFlags & PFLAG_SKIP_DRAW) == PFLAG_SKIP_DRAW) {
   13357                         dispatchDraw(canvas);
   13358                         if (mOverlay != null && !mOverlay.isEmpty()) {
   13359                             mOverlay.getOverlayView().draw(canvas);
   13360                         }
   13361                     } else {
   13362                         draw(canvas);
   13363                     }
   13364                 }
   13365             } finally {
   13366                 displayList.end();
   13367                 displayList.setCaching(caching);
   13368                 if (isLayer) {
   13369                     displayList.setLeftTopRightBottom(0, 0, width, height);
   13370                 } else {
   13371                     setDisplayListProperties(displayList);
   13372                 }
   13373             }
   13374         } else if (!isLayer) {
   13375             mPrivateFlags |= PFLAG_DRAWN | PFLAG_DRAWING_CACHE_VALID;
   13376             mPrivateFlags &= ~PFLAG_DIRTY_MASK;
   13377         }
   13378 
   13379         return displayList;
   13380     }
   13381 
   13382     /**
   13383      * Get the DisplayList for the HardwareLayer
   13384      *
   13385      * @param layer The HardwareLayer whose DisplayList we want
   13386      * @return A DisplayList fopr the specified HardwareLayer
   13387      */
   13388     private DisplayList getHardwareLayerDisplayList(HardwareLayer layer) {
   13389         DisplayList displayList = getDisplayList(layer.getDisplayList(), true);
   13390         layer.setDisplayList(displayList);
   13391         return displayList;
   13392     }
   13393 
   13394 
   13395     /**
   13396      * <p>Returns a display list that can be used to draw this view again
   13397      * without executing its draw method.</p>
   13398      *
   13399      * @return A DisplayList ready to replay, or null if caching is not enabled.
   13400      *
   13401      * @hide
   13402      */
   13403     public DisplayList getDisplayList() {
   13404         mDisplayList = getDisplayList(mDisplayList, false);
   13405         return mDisplayList;
   13406     }
   13407 
   13408     private void clearDisplayList() {
   13409         if (mDisplayList != null) {
   13410             mDisplayList.clear();
   13411         }
   13412     }
   13413 
   13414     private void resetDisplayList() {
   13415         if (mDisplayList != null) {
   13416             mDisplayList.reset();
   13417         }
   13418     }
   13419 
   13420     /**
   13421      * <p>Calling this method is equivalent to calling <code>getDrawingCache(false)</code>.</p>
   13422      *
   13423      * @return A non-scaled bitmap representing this view or null if cache is disabled.
   13424      *
   13425      * @see #getDrawingCache(boolean)
   13426      */
   13427     public Bitmap getDrawingCache() {
   13428         return getDrawingCache(false);
   13429     }
   13430 
   13431     /**
   13432      * <p>Returns the bitmap in which this view drawing is cached. The returned bitmap
   13433      * is null when caching is disabled. If caching is enabled and the cache is not ready,
   13434      * this method will create it. Calling {@link #draw(android.graphics.Canvas)} will not
   13435      * draw from the cache when the cache is enabled. To benefit from the cache, you must
   13436      * request the drawing cache by calling this method and draw it on screen if the
   13437      * returned bitmap is not null.</p>
   13438      *
   13439      * <p>Note about auto scaling in compatibility mode: When auto scaling is not enabled,
   13440      * this method will create a bitmap of the same size as this view. Because this bitmap
   13441      * will be drawn scaled by the parent ViewGroup, the result on screen might show
   13442      * scaling artifacts. To avoid such artifacts, you should call this method by setting
   13443      * the auto scaling to true. Doing so, however, will generate a bitmap of a different
   13444      * size than the view. This implies that your application must be able to handle this
   13445      * size.</p>
   13446      *
   13447      * @param autoScale Indicates whether the generated bitmap should be scaled based on
   13448      *        the current density of the screen when the application is in compatibility
   13449      *        mode.
   13450      *
   13451      * @return A bitmap representing this view or null if cache is disabled.
   13452      *
   13453      * @see #setDrawingCacheEnabled(boolean)
   13454      * @see #isDrawingCacheEnabled()
   13455      * @see #buildDrawingCache(boolean)
   13456      * @see #destroyDrawingCache()
   13457      */
   13458     public Bitmap getDrawingCache(boolean autoScale) {
   13459         if ((mViewFlags & WILL_NOT_CACHE_DRAWING) == WILL_NOT_CACHE_DRAWING) {
   13460             return null;
   13461         }
   13462         if ((mViewFlags & DRAWING_CACHE_ENABLED) == DRAWING_CACHE_ENABLED) {
   13463             buildDrawingCache(autoScale);
   13464         }
   13465         return autoScale ? mDrawingCache : mUnscaledDrawingCache;
   13466     }
   13467 
   13468     /**
   13469      * <p>Frees the resources used by the drawing cache. If you call
   13470      * {@link #buildDrawingCache()} manually without calling
   13471      * {@link #setDrawingCacheEnabled(boolean) setDrawingCacheEnabled(true)}, you
   13472      * should cleanup the cache with this method afterwards.</p>
   13473      *
   13474      * @see #setDrawingCacheEnabled(boolean)
   13475      * @see #buildDrawingCache()
   13476      * @see #getDrawingCache()
   13477      */
   13478     public void destroyDrawingCache() {
   13479         if (mDrawingCache != null) {
   13480             mDrawingCache.recycle();
   13481             mDrawingCache = null;
   13482         }
   13483         if (mUnscaledDrawingCache != null) {
   13484             mUnscaledDrawingCache.recycle();
   13485             mUnscaledDrawingCache = null;
   13486         }
   13487     }
   13488 
   13489     /**
   13490      * Setting a solid background color for the drawing cache's bitmaps will improve
   13491      * performance and memory usage. Note, though that this should only be used if this
   13492      * view will always be drawn on top of a solid color.
   13493      *
   13494      * @param color The background color to use for the drawing cache's bitmap
   13495      *
   13496      * @see #setDrawingCacheEnabled(boolean)
   13497      * @see #buildDrawingCache()
   13498      * @see #getDrawingCache()
   13499      */
   13500     public void setDrawingCacheBackgroundColor(int color) {
   13501         if (color != mDrawingCacheBackgroundColor) {
   13502             mDrawingCacheBackgroundColor = color;
   13503             mPrivateFlags &= ~PFLAG_DRAWING_CACHE_VALID;
   13504         }
   13505     }
   13506 
   13507     /**
   13508      * @see #setDrawingCacheBackgroundColor(int)
   13509      *
   13510      * @return The background color to used for the drawing cache's bitmap
   13511      */
   13512     public int getDrawingCacheBackgroundColor() {
   13513         return mDrawingCacheBackgroundColor;
   13514     }
   13515 
   13516     /**
   13517      * <p>Calling this method is equivalent to calling <code>buildDrawingCache(false)</code>.</p>
   13518      *
   13519      * @see #buildDrawingCache(boolean)
   13520      */
   13521     public void buildDrawingCache() {
   13522         buildDrawingCache(false);
   13523     }
   13524 
   13525     /**
   13526      * <p>Forces the drawing cache to be built if the drawing cache is invalid.</p>
   13527      *
   13528      * <p>If you call {@link #buildDrawingCache()} manually without calling
   13529      * {@link #setDrawingCacheEnabled(boolean) setDrawingCacheEnabled(true)}, you
   13530      * should cleanup the cache by calling {@link #destroyDrawingCache()} afterwards.</p>
   13531      *
   13532      * <p>Note about auto scaling in compatibility mode: When auto scaling is not enabled,
   13533      * this method will create a bitmap of the same size as this view. Because this bitmap
   13534      * will be drawn scaled by the parent ViewGroup, the result on screen might show
   13535      * scaling artifacts. To avoid such artifacts, you should call this method by setting
   13536      * the auto scaling to true. Doing so, however, will generate a bitmap of a different
   13537      * size than the view. This implies that your application must be able to handle this
   13538      * size.</p>
   13539      *
   13540      * <p>You should avoid calling this method when hardware acceleration is enabled. If
   13541      * you do not need the drawing cache bitmap, calling this method will increase memory
   13542      * usage and cause the view to be rendered in software once, thus negatively impacting
   13543      * performance.</p>
   13544      *
   13545      * @see #getDrawingCache()
   13546      * @see #destroyDrawingCache()
   13547      */
   13548     public void buildDrawingCache(boolean autoScale) {
   13549         if ((mPrivateFlags & PFLAG_DRAWING_CACHE_VALID) == 0 || (autoScale ?
   13550                 mDrawingCache == null : mUnscaledDrawingCache == null)) {
   13551             mCachingFailed = false;
   13552 
   13553             int width = mRight - mLeft;
   13554             int height = mBottom - mTop;
   13555 
   13556             final AttachInfo attachInfo = mAttachInfo;
   13557             final boolean scalingRequired = attachInfo != null && attachInfo.mScalingRequired;
   13558 
   13559             if (autoScale && scalingRequired) {
   13560                 width = (int) ((width * attachInfo.mApplicationScale) + 0.5f);
   13561                 height = (int) ((height * attachInfo.mApplicationScale) + 0.5f);
   13562             }
   13563 
   13564             final int drawingCacheBackgroundColor = mDrawingCacheBackgroundColor;
   13565             final boolean opaque = drawingCacheBackgroundColor != 0 || isOpaque();
   13566             final boolean use32BitCache = attachInfo != null && attachInfo.mUse32BitDrawingCache;
   13567 
   13568             final long projectedBitmapSize = width * height * (opaque && !use32BitCache ? 2 : 4);
   13569             final long drawingCacheSize =
   13570                     ViewConfiguration.get(mContext).getScaledMaximumDrawingCacheSize();
   13571             if (width <= 0 || height <= 0 || projectedBitmapSize > drawingCacheSize) {
   13572                 if (width > 0 && height > 0) {
   13573                     Log.w(VIEW_LOG_TAG, "View too large to fit into drawing cache, needs "
   13574                             + projectedBitmapSize + " bytes, only "
   13575                             + drawingCacheSize + " available");
   13576                 }
   13577                 destroyDrawingCache();
   13578                 mCachingFailed = true;
   13579                 return;
   13580             }
   13581 
   13582             boolean clear = true;
   13583             Bitmap bitmap = autoScale ? mDrawingCache : mUnscaledDrawingCache;
   13584 
   13585             if (bitmap == null || bitmap.getWidth() != width || bitmap.getHeight() != height) {
   13586                 Bitmap.Config quality;
   13587                 if (!opaque) {
   13588                     // Never pick ARGB_4444 because it looks awful
   13589                     // Keep the DRAWING_CACHE_QUALITY_LOW flag just in case
   13590                     switch (mViewFlags & DRAWING_CACHE_QUALITY_MASK) {
   13591                         case DRAWING_CACHE_QUALITY_AUTO:
   13592                         case DRAWING_CACHE_QUALITY_LOW:
   13593                         case DRAWING_CACHE_QUALITY_HIGH:
   13594                         default:
   13595                             quality = Bitmap.Config.ARGB_8888;
   13596                             break;
   13597                     }
   13598                 } else {
   13599                     // Optimization for translucent windows
   13600                     // If the window is translucent, use a 32 bits bitmap to benefit from memcpy()
   13601                     quality = use32BitCache ? Bitmap.Config.ARGB_8888 : Bitmap.Config.RGB_565;
   13602                 }
   13603 
   13604                 // Try to cleanup memory
   13605                 if (bitmap != null) bitmap.recycle();
   13606 
   13607                 try {
   13608                     bitmap = Bitmap.createBitmap(mResources.getDisplayMetrics(),
   13609                             width, height, quality);
   13610                     bitmap.setDensity(getResources().getDisplayMetrics().densityDpi);
   13611                     if (autoScale) {
   13612                         mDrawingCache = bitmap;
   13613                     } else {
   13614                         mUnscaledDrawingCache = bitmap;
   13615                     }
   13616                     if (opaque && use32BitCache) bitmap.setHasAlpha(false);
   13617                 } catch (OutOfMemoryError e) {
   13618                     // If there is not enough memory to create the bitmap cache, just
   13619                     // ignore the issue as bitmap caches are not required to draw the
   13620                     // view hierarchy
   13621                     if (autoScale) {
   13622                         mDrawingCache = null;
   13623                     } else {
   13624                         mUnscaledDrawingCache = null;
   13625                     }
   13626                     mCachingFailed = true;
   13627                     return;
   13628                 }
   13629 
   13630                 clear = drawingCacheBackgroundColor != 0;
   13631             }
   13632 
   13633             Canvas canvas;
   13634             if (attachInfo != null) {
   13635                 canvas = attachInfo.mCanvas;
   13636                 if (canvas == null) {
   13637                     canvas = new Canvas();
   13638                 }
   13639                 canvas.setBitmap(bitmap);
   13640                 // Temporarily clobber the cached Canvas in case one of our children
   13641                 // is also using a drawing cache. Without this, the children would
   13642                 // steal the canvas by attaching their own bitmap to it and bad, bad
   13643                 // thing would happen (invisible views, corrupted drawings, etc.)
   13644                 attachInfo.mCanvas = null;
   13645             } else {
   13646                 // This case should hopefully never or seldom happen
   13647                 canvas = new Canvas(bitmap);
   13648             }
   13649 
   13650             if (clear) {
   13651                 bitmap.eraseColor(drawingCacheBackgroundColor);
   13652             }
   13653 
   13654             computeScroll();
   13655             final int restoreCount = canvas.save();
   13656 
   13657             if (autoScale && scalingRequired) {
   13658                 final float scale = attachInfo.mApplicationScale;
   13659                 canvas.scale(scale, scale);
   13660             }
   13661 
   13662             canvas.translate(-mScrollX, -mScrollY);
   13663 
   13664             mPrivateFlags |= PFLAG_DRAWN;
   13665             if (mAttachInfo == null || !mAttachInfo.mHardwareAccelerated ||
   13666                     mLayerType != LAYER_TYPE_NONE) {
   13667                 mPrivateFlags |= PFLAG_DRAWING_CACHE_VALID;
   13668             }
   13669 
   13670             // Fast path for layouts with no backgrounds
   13671             if ((mPrivateFlags & PFLAG_SKIP_DRAW) == PFLAG_SKIP_DRAW) {
   13672                 mPrivateFlags &= ~PFLAG_DIRTY_MASK;
   13673                 dispatchDraw(canvas);
   13674                 if (mOverlay != null && !mOverlay.isEmpty()) {
   13675                     mOverlay.getOverlayView().draw(canvas);
   13676                 }
   13677             } else {
   13678                 draw(canvas);
   13679             }
   13680 
   13681             canvas.restoreToCount(restoreCount);
   13682             canvas.setBitmap(null);
   13683 
   13684             if (attachInfo != null) {
   13685                 // Restore the cached Canvas for our siblings
   13686                 attachInfo.mCanvas = canvas;
   13687             }
   13688         }
   13689     }
   13690 
   13691     /**
   13692      * Create a snapshot of the view into a bitmap.  We should probably make
   13693      * some form of this public, but should think about the API.
   13694      */
   13695     Bitmap createSnapshot(Bitmap.Config quality, int backgroundColor, boolean skipChildren) {
   13696         int width = mRight - mLeft;
   13697         int height = mBottom - mTop;
   13698 
   13699         final AttachInfo attachInfo = mAttachInfo;
   13700         final float scale = attachInfo != null ? attachInfo.mApplicationScale : 1.0f;
   13701         width = (int) ((width * scale) + 0.5f);
   13702         height = (int) ((height * scale) + 0.5f);
   13703 
   13704         Bitmap bitmap = Bitmap.createBitmap(mResources.getDisplayMetrics(),
   13705                 width > 0 ? width : 1, height > 0 ? height : 1, quality);
   13706         if (bitmap == null) {
   13707             throw new OutOfMemoryError();
   13708         }
   13709 
   13710         Resources resources = getResources();
   13711         if (resources != null) {
   13712             bitmap.setDensity(resources.getDisplayMetrics().densityDpi);
   13713         }
   13714 
   13715         Canvas canvas;
   13716         if (attachInfo != null) {
   13717             canvas = attachInfo.mCanvas;
   13718             if (canvas == null) {
   13719                 canvas = new Canvas();
   13720             }
   13721             canvas.setBitmap(bitmap);
   13722             // Temporarily clobber the cached Canvas in case one of our children
   13723             // is also using a drawing cache. Without this, the children would
   13724             // steal the canvas by attaching their own bitmap to it and bad, bad
   13725             // things would happen (invisible views, corrupted drawings, etc.)
   13726             attachInfo.mCanvas = null;
   13727         } else {
   13728             // This case should hopefully never or seldom happen
   13729             canvas = new Canvas(bitmap);
   13730         }
   13731 
   13732         if ((backgroundColor & 0xff000000) != 0) {
   13733             bitmap.eraseColor(backgroundColor);
   13734         }
   13735 
   13736         computeScroll();
   13737         final int restoreCount = canvas.save();
   13738         canvas.scale(scale, scale);
   13739         canvas.translate(-mScrollX, -mScrollY);
   13740 
   13741         // Temporarily remove the dirty mask
   13742         int flags = mPrivateFlags;
   13743         mPrivateFlags &= ~PFLAG_DIRTY_MASK;
   13744 
   13745         // Fast path for layouts with no backgrounds
   13746         if ((mPrivateFlags & PFLAG_SKIP_DRAW) == PFLAG_SKIP_DRAW) {
   13747             dispatchDraw(canvas);
   13748             if (mOverlay != null && !mOverlay.isEmpty()) {
   13749                 mOverlay.getOverlayView().draw(canvas);
   13750             }
   13751         } else {
   13752             draw(canvas);
   13753         }
   13754 
   13755         mPrivateFlags = flags;
   13756 
   13757         canvas.restoreToCount(restoreCount);
   13758         canvas.setBitmap(null);
   13759 
   13760         if (attachInfo != null) {
   13761             // Restore the cached Canvas for our siblings
   13762             attachInfo.mCanvas = canvas;
   13763         }
   13764 
   13765         return bitmap;
   13766     }
   13767 
   13768     /**
   13769      * Indicates whether this View is currently in edit mode. A View is usually
   13770      * in edit mode when displayed within a developer tool. For instance, if
   13771      * this View is being drawn by a visual user interface builder, this method
   13772      * should return true.
   13773      *
   13774      * Subclasses should check the return value of this method to provide
   13775      * different behaviors if their normal behavior might interfere with the
   13776      * host environment. For instance: the class spawns a thread in its
   13777      * constructor, the drawing code relies on device-specific features, etc.
   13778      *
   13779      * This method is usually checked in the drawing code of custom widgets.
   13780      *
   13781      * @return True if this View is in edit mode, false otherwise.
   13782      */
   13783     public boolean isInEditMode() {
   13784         return false;
   13785     }
   13786 
   13787     /**
   13788      * If the View draws content inside its padding and enables fading edges,
   13789      * it needs to support padding offsets. Padding offsets are added to the
   13790      * fading edges to extend the length of the fade so that it covers pixels
   13791      * drawn inside the padding.
   13792      *
   13793      * Subclasses of this class should override this method if they need
   13794      * to draw content inside the padding.
   13795      *
   13796      * @return True if padding offset must be applied, false otherwise.
   13797      *
   13798      * @see #getLeftPaddingOffset()
   13799      * @see #getRightPaddingOffset()
   13800      * @see #getTopPaddingOffset()
   13801      * @see #getBottomPaddingOffset()
   13802      *
   13803      * @since CURRENT
   13804      */
   13805     protected boolean isPaddingOffsetRequired() {
   13806         return false;
   13807     }
   13808 
   13809     /**
   13810      * Amount by which to extend the left fading region. Called only when
   13811      * {@link #isPaddingOffsetRequired()} returns true.
   13812      *
   13813      * @return The left padding offset in pixels.
   13814      *
   13815      * @see #isPaddingOffsetRequired()
   13816      *
   13817      * @since CURRENT
   13818      */
   13819     protected int getLeftPaddingOffset() {
   13820         return 0;
   13821     }
   13822 
   13823     /**
   13824      * Amount by which to extend the right fading region. Called only when
   13825      * {@link #isPaddingOffsetRequired()} returns true.
   13826      *
   13827      * @return The right padding offset in pixels.
   13828      *
   13829      * @see #isPaddingOffsetRequired()
   13830      *
   13831      * @since CURRENT
   13832      */
   13833     protected int getRightPaddingOffset() {
   13834         return 0;
   13835     }
   13836 
   13837     /**
   13838      * Amount by which to extend the top fading region. Called only when
   13839      * {@link #isPaddingOffsetRequired()} returns true.
   13840      *
   13841      * @return The top padding offset in pixels.
   13842      *
   13843      * @see #isPaddingOffsetRequired()
   13844      *
   13845      * @since CURRENT
   13846      */
   13847     protected int getTopPaddingOffset() {
   13848         return 0;
   13849     }
   13850 
   13851     /**
   13852      * Amount by which to extend the bottom fading region. Called only when
   13853      * {@link #isPaddingOffsetRequired()} returns true.
   13854      *
   13855      * @return The bottom padding offset in pixels.
   13856      *
   13857      * @see #isPaddingOffsetRequired()
   13858      *
   13859      * @since CURRENT
   13860      */
   13861     protected int getBottomPaddingOffset() {
   13862         return 0;
   13863     }
   13864 
   13865     /**
   13866      * @hide
   13867      * @param offsetRequired
   13868      */
   13869     protected int getFadeTop(boolean offsetRequired) {
   13870         int top = mPaddingTop;
   13871         if (offsetRequired) top += getTopPaddingOffset();
   13872         return top;
   13873     }
   13874 
   13875     /**
   13876      * @hide
   13877      * @param offsetRequired
   13878      */
   13879     protected int getFadeHeight(boolean offsetRequired) {
   13880         int padding = mPaddingTop;
   13881         if (offsetRequired) padding += getTopPaddingOffset();
   13882         return mBottom - mTop - mPaddingBottom - padding;
   13883     }
   13884 
   13885     /**
   13886      * <p>Indicates whether this view is attached to a hardware accelerated
   13887      * window or not.</p>
   13888      *
   13889      * <p>Even if this method returns true, it does not mean that every call
   13890      * to {@link #draw(android.graphics.Canvas)} will be made with an hardware
   13891      * accelerated {@link android.graphics.Canvas}. For instance, if this view
   13892      * is drawn onto an offscreen {@link android.graphics.Bitmap} and its
   13893      * window is hardware accelerated,
   13894      * {@link android.graphics.Canvas#isHardwareAccelerated()} will likely
   13895      * return false, and this method will return true.</p>
   13896      *
   13897      * @return True if the view is attached to a window and the window is
   13898      *         hardware accelerated; false in any other case.
   13899      */
   13900     public boolean isHardwareAccelerated() {
   13901         return mAttachInfo != null && mAttachInfo.mHardwareAccelerated;
   13902     }
   13903 
   13904     /**
   13905      * Sets a rectangular area on this view to which the view will be clipped
   13906      * when it is drawn. Setting the value to null will remove the clip bounds
   13907      * and the view will draw normally, using its full bounds.
   13908      *
   13909      * @param clipBounds The rectangular area, in the local coordinates of
   13910      * this view, to which future drawing operations will be clipped.
   13911      */
   13912     public void setClipBounds(Rect clipBounds) {
   13913         if (clipBounds != null) {
   13914             if (clipBounds.equals(mClipBounds)) {
   13915                 return;
   13916             }
   13917             if (mClipBounds == null) {
   13918                 invalidate();
   13919                 mClipBounds = new Rect(clipBounds);
   13920             } else {
   13921                 invalidate(Math.min(mClipBounds.left, clipBounds.left),
   13922                         Math.min(mClipBounds.top, clipBounds.top),
   13923                         Math.max(mClipBounds.right, clipBounds.right),
   13924                         Math.max(mClipBounds.bottom, clipBounds.bottom));
   13925                 mClipBounds.set(clipBounds);
   13926             }
   13927         } else {
   13928             if (mClipBounds != null) {
   13929                 invalidate();
   13930                 mClipBounds = null;
   13931             }
   13932         }
   13933     }
   13934 
   13935     /**
   13936      * Returns a copy of the current {@link #setClipBounds(Rect) clipBounds}.
   13937      *
   13938      * @return A copy of the current clip bounds if clip bounds are set,
   13939      * otherwise null.
   13940      */
   13941     public Rect getClipBounds() {
   13942         return (mClipBounds != null) ? new Rect(mClipBounds) : null;
   13943     }
   13944 
   13945     /**
   13946      * Utility function, called by draw(canvas, parent, drawingTime) to handle the less common
   13947      * case of an active Animation being run on the view.
   13948      */
   13949     private boolean drawAnimation(ViewGroup parent, long drawingTime,
   13950             Animation a, boolean scalingRequired) {
   13951         Transformation invalidationTransform;
   13952         final int flags = parent.mGroupFlags;
   13953         final boolean initialized = a.isInitialized();
   13954         if (!initialized) {
   13955             a.initialize(mRight - mLeft, mBottom - mTop, parent.getWidth(), parent.getHeight());
   13956             a.initializeInvalidateRegion(0, 0, mRight - mLeft, mBottom - mTop);
   13957             if (mAttachInfo != null) a.setListenerHandler(mAttachInfo.mHandler);
   13958             onAnimationStart();
   13959         }
   13960 
   13961         final Transformation t = parent.getChildTransformation();
   13962         boolean more = a.getTransformation(drawingTime, t, 1f);
   13963         if (scalingRequired && mAttachInfo.mApplicationScale != 1f) {
   13964             if (parent.mInvalidationTransformation == null) {
   13965                 parent.mInvalidationTransformation = new Transformation();
   13966             }
   13967             invalidationTransform = parent.mInvalidationTransformation;
   13968             a.getTransformation(drawingTime, invalidationTransform, 1f);
   13969         } else {
   13970             invalidationTransform = t;
   13971         }
   13972 
   13973         if (more) {
   13974             if (!a.willChangeBounds()) {
   13975                 if ((flags & (ViewGroup.FLAG_OPTIMIZE_INVALIDATE | ViewGroup.FLAG_ANIMATION_DONE)) ==
   13976                         ViewGroup.FLAG_OPTIMIZE_INVALIDATE) {
   13977                     parent.mGroupFlags |= ViewGroup.FLAG_INVALIDATE_REQUIRED;
   13978                 } else if ((flags & ViewGroup.FLAG_INVALIDATE_REQUIRED) == 0) {
   13979                     // The child need to draw an animation, potentially offscreen, so
   13980                     // make sure we do not cancel invalidate requests
   13981                     parent.mPrivateFlags |= PFLAG_DRAW_ANIMATION;
   13982                     parent.invalidate(mLeft, mTop, mRight, mBottom);
   13983                 }
   13984             } else {
   13985                 if (parent.mInvalidateRegion == null) {
   13986                     parent.mInvalidateRegion = new RectF();
   13987                 }
   13988                 final RectF region = parent.mInvalidateRegion;
   13989                 a.getInvalidateRegion(0, 0, mRight - mLeft, mBottom - mTop, region,
   13990                         invalidationTransform);
   13991 
   13992                 // The child need to draw an animation, potentially offscreen, so
   13993                 // make sure we do not cancel invalidate requests
   13994                 parent.mPrivateFlags |= PFLAG_DRAW_ANIMATION;
   13995 
   13996                 final int left = mLeft + (int) region.left;
   13997                 final int top = mTop + (int) region.top;
   13998                 parent.invalidate(left, top, left + (int) (region.width() + .5f),
   13999                         top + (int) (region.height() + .5f));
   14000             }
   14001         }
   14002         return more;
   14003     }
   14004 
   14005     /**
   14006      * This method is called by getDisplayList() when a display list is created or re-rendered.
   14007      * It sets or resets the current value of all properties on that display list (resetting is
   14008      * necessary when a display list is being re-created, because we need to make sure that
   14009      * previously-set transform values
   14010      */
   14011     void setDisplayListProperties(DisplayList displayList) {
   14012         if (displayList != null) {
   14013             displayList.setLeftTopRightBottom(mLeft, mTop, mRight, mBottom);
   14014             displayList.setHasOverlappingRendering(hasOverlappingRendering());
   14015             if (mParent instanceof ViewGroup) {
   14016                 displayList.setClipToBounds(
   14017                         (((ViewGroup) mParent).mGroupFlags & ViewGroup.FLAG_CLIP_CHILDREN) != 0);
   14018             }
   14019             float alpha = 1;
   14020             if (mParent instanceof ViewGroup && (((ViewGroup) mParent).mGroupFlags &
   14021                     ViewGroup.FLAG_SUPPORT_STATIC_TRANSFORMATIONS) != 0) {
   14022                 ViewGroup parentVG = (ViewGroup) mParent;
   14023                 final Transformation t = parentVG.getChildTransformation();
   14024                 if (parentVG.getChildStaticTransformation(this, t)) {
   14025                     final int transformType = t.getTransformationType();
   14026                     if (transformType != Transformation.TYPE_IDENTITY) {
   14027                         if ((transformType & Transformation.TYPE_ALPHA) != 0) {
   14028                             alpha = t.getAlpha();
   14029                         }
   14030                         if ((transformType & Transformation.TYPE_MATRIX) != 0) {
   14031                             displayList.setMatrix(t.getMatrix());
   14032                         }
   14033                     }
   14034                 }
   14035             }
   14036             if (mTransformationInfo != null) {
   14037                 alpha *= getFinalAlpha();
   14038                 if (alpha < 1) {
   14039                     final int multipliedAlpha = (int) (255 * alpha);
   14040                     if (onSetAlpha(multipliedAlpha)) {
   14041                         alpha = 1;
   14042                     }
   14043                 }
   14044                 displayList.setTransformationInfo(alpha,
   14045                         mTransformationInfo.mTranslationX, mTransformationInfo.mTranslationY,
   14046                         mTransformationInfo.mRotation, mTransformationInfo.mRotationX,
   14047                         mTransformationInfo.mRotationY, mTransformationInfo.mScaleX,
   14048                         mTransformationInfo.mScaleY);
   14049                 if (mTransformationInfo.mCamera == null) {
   14050                     mTransformationInfo.mCamera = new Camera();
   14051                     mTransformationInfo.matrix3D = new Matrix();
   14052                 }
   14053                 displayList.setCameraDistance(mTransformationInfo.mCamera.getLocationZ());
   14054                 if ((mPrivateFlags & PFLAG_PIVOT_EXPLICITLY_SET) == PFLAG_PIVOT_EXPLICITLY_SET) {
   14055                     displayList.setPivotX(getPivotX());
   14056                     displayList.setPivotY(getPivotY());
   14057                 }
   14058             } else if (alpha < 1) {
   14059                 displayList.setAlpha(alpha);
   14060             }
   14061         }
   14062     }
   14063 
   14064     /**
   14065      * This method is called by ViewGroup.drawChild() to have each child view draw itself.
   14066      * This draw() method is an implementation detail and is not intended to be overridden or
   14067      * to be called from anywhere else other than ViewGroup.drawChild().
   14068      */
   14069     boolean draw(Canvas canvas, ViewGroup parent, long drawingTime) {
   14070         boolean useDisplayListProperties = mAttachInfo != null && mAttachInfo.mHardwareAccelerated;
   14071         boolean more = false;
   14072         final boolean childHasIdentityMatrix = hasIdentityMatrix();
   14073         final int flags = parent.mGroupFlags;
   14074 
   14075         if ((flags & ViewGroup.FLAG_CLEAR_TRANSFORMATION) == ViewGroup.FLAG_CLEAR_TRANSFORMATION) {
   14076             parent.getChildTransformation().clear();
   14077             parent.mGroupFlags &= ~ViewGroup.FLAG_CLEAR_TRANSFORMATION;
   14078         }
   14079 
   14080         Transformation transformToApply = null;
   14081         boolean concatMatrix = false;
   14082 
   14083         boolean scalingRequired = false;
   14084         boolean caching;
   14085         int layerType = getLayerType();
   14086 
   14087         final boolean hardwareAccelerated = canvas.isHardwareAccelerated();
   14088         if ((flags & ViewGroup.FLAG_CHILDREN_DRAWN_WITH_CACHE) != 0 ||
   14089                 (flags & ViewGroup.FLAG_ALWAYS_DRAWN_WITH_CACHE) != 0) {
   14090             caching = true;
   14091             // Auto-scaled apps are not hw-accelerated, no need to set scaling flag on DisplayList
   14092             if (mAttachInfo != null) scalingRequired = mAttachInfo.mScalingRequired;
   14093         } else {
   14094             caching = (layerType != LAYER_TYPE_NONE) || hardwareAccelerated;
   14095         }
   14096 
   14097         final Animation a = getAnimation();
   14098         if (a != null) {
   14099             more = drawAnimation(parent, drawingTime, a, scalingRequired);
   14100             concatMatrix = a.willChangeTransformationMatrix();
   14101             if (concatMatrix) {
   14102                 mPrivateFlags3 |= PFLAG3_VIEW_IS_ANIMATING_TRANSFORM;
   14103             }
   14104             transformToApply = parent.getChildTransformation();
   14105         } else {
   14106             if ((mPrivateFlags3 & PFLAG3_VIEW_IS_ANIMATING_TRANSFORM) ==
   14107                     PFLAG3_VIEW_IS_ANIMATING_TRANSFORM && mDisplayList != null) {
   14108                 // No longer animating: clear out old animation matrix
   14109                 mDisplayList.setAnimationMatrix(null);
   14110                 mPrivateFlags3 &= ~PFLAG3_VIEW_IS_ANIMATING_TRANSFORM;
   14111             }
   14112             if (!useDisplayListProperties &&
   14113                     (flags & ViewGroup.FLAG_SUPPORT_STATIC_TRANSFORMATIONS) != 0) {
   14114                 final Transformation t = parent.getChildTransformation();
   14115                 final boolean hasTransform = parent.getChildStaticTransformation(this, t);
   14116                 if (hasTransform) {
   14117                     final int transformType = t.getTransformationType();
   14118                     transformToApply = transformType != Transformation.TYPE_IDENTITY ? t : null;
   14119                     concatMatrix = (transformType & Transformation.TYPE_MATRIX) != 0;
   14120                 }
   14121             }
   14122         }
   14123 
   14124         concatMatrix |= !childHasIdentityMatrix;
   14125 
   14126         // Sets the flag as early as possible to allow draw() implementations
   14127         // to call invalidate() successfully when doing animations
   14128         mPrivateFlags |= PFLAG_DRAWN;
   14129 
   14130         if (!concatMatrix &&
   14131                 (flags & (ViewGroup.FLAG_SUPPORT_STATIC_TRANSFORMATIONS |
   14132                         ViewGroup.FLAG_CLIP_CHILDREN)) == ViewGroup.FLAG_CLIP_CHILDREN &&
   14133                 canvas.quickReject(mLeft, mTop, mRight, mBottom, Canvas.EdgeType.BW) &&
   14134                 (mPrivateFlags & PFLAG_DRAW_ANIMATION) == 0) {
   14135             mPrivateFlags2 |= PFLAG2_VIEW_QUICK_REJECTED;
   14136             return more;
   14137         }
   14138         mPrivateFlags2 &= ~PFLAG2_VIEW_QUICK_REJECTED;
   14139 
   14140         if (hardwareAccelerated) {
   14141             // Clear INVALIDATED flag to allow invalidation to occur during rendering, but
   14142             // retain the flag's value temporarily in the mRecreateDisplayList flag
   14143             mRecreateDisplayList = (mPrivateFlags & PFLAG_INVALIDATED) == PFLAG_INVALIDATED;
   14144             mPrivateFlags &= ~PFLAG_INVALIDATED;
   14145         }
   14146 
   14147         DisplayList displayList = null;
   14148         Bitmap cache = null;
   14149         boolean hasDisplayList = false;
   14150         if (caching) {
   14151             if (!hardwareAccelerated) {
   14152                 if (layerType != LAYER_TYPE_NONE) {
   14153                     layerType = LAYER_TYPE_SOFTWARE;
   14154                     buildDrawingCache(true);
   14155                 }
   14156                 cache = getDrawingCache(true);
   14157             } else {
   14158                 switch (layerType) {
   14159                     case LAYER_TYPE_SOFTWARE:
   14160                         if (useDisplayListProperties) {
   14161                             hasDisplayList = canHaveDisplayList();
   14162                         } else {
   14163                             buildDrawingCache(true);
   14164                             cache = getDrawingCache(true);
   14165                         }
   14166                         break;
   14167                     case LAYER_TYPE_HARDWARE:
   14168                         if (useDisplayListProperties) {
   14169                             hasDisplayList = canHaveDisplayList();
   14170                         }
   14171                         break;
   14172                     case LAYER_TYPE_NONE:
   14173                         // Delay getting the display list until animation-driven alpha values are
   14174                         // set up and possibly passed on to the view
   14175                         hasDisplayList = canHaveDisplayList();
   14176                         break;
   14177                 }
   14178             }
   14179         }
   14180         useDisplayListProperties &= hasDisplayList;
   14181         if (useDisplayListProperties) {
   14182             displayList = getDisplayList();
   14183             if (!displayList.isValid()) {
   14184                 // Uncommon, but possible. If a view is removed from the hierarchy during the call
   14185                 // to getDisplayList(), the display list will be marked invalid and we should not
   14186                 // try to use it again.
   14187                 displayList = null;
   14188                 hasDisplayList = false;
   14189                 useDisplayListProperties = false;
   14190             }
   14191         }
   14192 
   14193         int sx = 0;
   14194         int sy = 0;
   14195         if (!hasDisplayList) {
   14196             computeScroll();
   14197             sx = mScrollX;
   14198             sy = mScrollY;
   14199         }
   14200 
   14201         final boolean hasNoCache = cache == null || hasDisplayList;
   14202         final boolean offsetForScroll = cache == null && !hasDisplayList &&
   14203                 layerType != LAYER_TYPE_HARDWARE;
   14204 
   14205         int restoreTo = -1;
   14206         if (!useDisplayListProperties || transformToApply != null) {
   14207             restoreTo = canvas.save();
   14208         }
   14209         if (offsetForScroll) {
   14210             canvas.translate(mLeft - sx, mTop - sy);
   14211         } else {
   14212             if (!useDisplayListProperties) {
   14213                 canvas.translate(mLeft, mTop);
   14214             }
   14215             if (scalingRequired) {
   14216                 if (useDisplayListProperties) {
   14217                     // TODO: Might not need this if we put everything inside the DL
   14218                     restoreTo = canvas.save();
   14219                 }
   14220                 // mAttachInfo cannot be null, otherwise scalingRequired == false
   14221                 final float scale = 1.0f / mAttachInfo.mApplicationScale;
   14222                 canvas.scale(scale, scale);
   14223             }
   14224         }
   14225 
   14226         float alpha = useDisplayListProperties ? 1 : (getAlpha() * getTransitionAlpha());
   14227         if (transformToApply != null || alpha < 1 ||  !hasIdentityMatrix() ||
   14228                 (mPrivateFlags3 & PFLAG3_VIEW_IS_ANIMATING_ALPHA) == PFLAG3_VIEW_IS_ANIMATING_ALPHA) {
   14229             if (transformToApply != null || !childHasIdentityMatrix) {
   14230                 int transX = 0;
   14231                 int transY = 0;
   14232 
   14233                 if (offsetForScroll) {
   14234                     transX = -sx;
   14235                     transY = -sy;
   14236                 }
   14237 
   14238                 if (transformToApply != null) {
   14239                     if (concatMatrix) {
   14240                         if (useDisplayListProperties) {
   14241                             displayList.setAnimationMatrix(transformToApply.getMatrix());
   14242                         } else {
   14243                             // Undo the scroll translation, apply the transformation matrix,
   14244                             // then redo the scroll translate to get the correct result.
   14245                             canvas.translate(-transX, -transY);
   14246                             canvas.concat(transformToApply.getMatrix());
   14247                             canvas.translate(transX, transY);
   14248                         }
   14249                         parent.mGroupFlags |= ViewGroup.FLAG_CLEAR_TRANSFORMATION;
   14250                     }
   14251 
   14252                     float transformAlpha = transformToApply.getAlpha();
   14253                     if (transformAlpha < 1) {
   14254                         alpha *= transformAlpha;
   14255                         parent.mGroupFlags |= ViewGroup.FLAG_CLEAR_TRANSFORMATION;
   14256                     }
   14257                 }
   14258 
   14259                 if (!childHasIdentityMatrix && !useDisplayListProperties) {
   14260                     canvas.translate(-transX, -transY);
   14261                     canvas.concat(getMatrix());
   14262                     canvas.translate(transX, transY);
   14263                 }
   14264             }
   14265 
   14266             // Deal with alpha if it is or used to be <1
   14267             if (alpha < 1 ||
   14268                     (mPrivateFlags3 & PFLAG3_VIEW_IS_ANIMATING_ALPHA) == PFLAG3_VIEW_IS_ANIMATING_ALPHA) {
   14269                 if (alpha < 1) {
   14270                     mPrivateFlags3 |= PFLAG3_VIEW_IS_ANIMATING_ALPHA;
   14271                 } else {
   14272                     mPrivateFlags3 &= ~PFLAG3_VIEW_IS_ANIMATING_ALPHA;
   14273                 }
   14274                 parent.mGroupFlags |= ViewGroup.FLAG_CLEAR_TRANSFORMATION;
   14275                 if (hasNoCache) {
   14276                     final int multipliedAlpha = (int) (255 * alpha);
   14277                     if (!onSetAlpha(multipliedAlpha)) {
   14278                         int layerFlags = Canvas.HAS_ALPHA_LAYER_SAVE_FLAG;
   14279                         if ((flags & ViewGroup.FLAG_CLIP_CHILDREN) != 0 ||
   14280                                 layerType != LAYER_TYPE_NONE) {
   14281                             layerFlags |= Canvas.CLIP_TO_LAYER_SAVE_FLAG;
   14282                         }
   14283                         if (useDisplayListProperties) {
   14284                             displayList.setAlpha(alpha * getAlpha() * getTransitionAlpha());
   14285                         } else  if (layerType == LAYER_TYPE_NONE) {
   14286                             final int scrollX = hasDisplayList ? 0 : sx;
   14287                             final int scrollY = hasDisplayList ? 0 : sy;
   14288                             canvas.saveLayerAlpha(scrollX, scrollY, scrollX + mRight - mLeft,
   14289                                     scrollY + mBottom - mTop, multipliedAlpha, layerFlags);
   14290                         }
   14291                     } else {
   14292                         // Alpha is handled by the child directly, clobber the layer's alpha
   14293                         mPrivateFlags |= PFLAG_ALPHA_SET;
   14294                     }
   14295                 }
   14296             }
   14297         } else if ((mPrivateFlags & PFLAG_ALPHA_SET) == PFLAG_ALPHA_SET) {
   14298             onSetAlpha(255);
   14299             mPrivateFlags &= ~PFLAG_ALPHA_SET;
   14300         }
   14301 
   14302         if ((flags & ViewGroup.FLAG_CLIP_CHILDREN) == ViewGroup.FLAG_CLIP_CHILDREN &&
   14303                 !useDisplayListProperties && cache == null) {
   14304             if (offsetForScroll) {
   14305                 canvas.clipRect(sx, sy, sx + (mRight - mLeft), sy + (mBottom - mTop));
   14306             } else {
   14307                 if (!scalingRequired || cache == null) {
   14308                     canvas.clipRect(0, 0, mRight - mLeft, mBottom - mTop);
   14309                 } else {
   14310                     canvas.clipRect(0, 0, cache.getWidth(), cache.getHeight());
   14311                 }
   14312             }
   14313         }
   14314 
   14315         if (!useDisplayListProperties && hasDisplayList) {
   14316             displayList = getDisplayList();
   14317             if (!displayList.isValid()) {
   14318                 // Uncommon, but possible. If a view is removed from the hierarchy during the call
   14319                 // to getDisplayList(), the display list will be marked invalid and we should not
   14320                 // try to use it again.
   14321                 displayList = null;
   14322                 hasDisplayList = false;
   14323             }
   14324         }
   14325 
   14326         if (hasNoCache) {
   14327             boolean layerRendered = false;
   14328             if (layerType == LAYER_TYPE_HARDWARE && !useDisplayListProperties) {
   14329                 final HardwareLayer layer = getHardwareLayer();
   14330                 if (layer != null && layer.isValid()) {
   14331                     mLayerPaint.setAlpha((int) (alpha * 255));
   14332                     ((HardwareCanvas) canvas).drawHardwareLayer(layer, 0, 0, mLayerPaint);
   14333                     layerRendered = true;
   14334                 } else {
   14335                     final int scrollX = hasDisplayList ? 0 : sx;
   14336                     final int scrollY = hasDisplayList ? 0 : sy;
   14337                     canvas.saveLayer(scrollX, scrollY,
   14338                             scrollX + mRight - mLeft, scrollY + mBottom - mTop, mLayerPaint,
   14339                             Canvas.HAS_ALPHA_LAYER_SAVE_FLAG | Canvas.CLIP_TO_LAYER_SAVE_FLAG);
   14340                 }
   14341             }
   14342 
   14343             if (!layerRendered) {
   14344                 if (!hasDisplayList) {
   14345                     // Fast path for layouts with no backgrounds
   14346                     if ((mPrivateFlags & PFLAG_SKIP_DRAW) == PFLAG_SKIP_DRAW) {
   14347                         mPrivateFlags &= ~PFLAG_DIRTY_MASK;
   14348                         dispatchDraw(canvas);
   14349                     } else {
   14350                         draw(canvas);
   14351                     }
   14352                 } else {
   14353                     mPrivateFlags &= ~PFLAG_DIRTY_MASK;
   14354                     ((HardwareCanvas) canvas).drawDisplayList(displayList, null, flags);
   14355                 }
   14356             }
   14357         } else if (cache != null) {
   14358             mPrivateFlags &= ~PFLAG_DIRTY_MASK;
   14359             Paint cachePaint;
   14360 
   14361             if (layerType == LAYER_TYPE_NONE) {
   14362                 cachePaint = parent.mCachePaint;
   14363                 if (cachePaint == null) {
   14364                     cachePaint = new Paint();
   14365                     cachePaint.setDither(false);
   14366                     parent.mCachePaint = cachePaint;
   14367                 }
   14368                 if (alpha < 1) {
   14369                     cachePaint.setAlpha((int) (alpha * 255));
   14370                     parent.mGroupFlags |= ViewGroup.FLAG_ALPHA_LOWER_THAN_ONE;
   14371                 } else if  ((flags & ViewGroup.FLAG_ALPHA_LOWER_THAN_ONE) != 0) {
   14372                     cachePaint.setAlpha(255);
   14373                     parent.mGroupFlags &= ~ViewGroup.FLAG_ALPHA_LOWER_THAN_ONE;
   14374                 }
   14375             } else {
   14376                 cachePaint = mLayerPaint;
   14377                 cachePaint.setAlpha((int) (alpha * 255));
   14378             }
   14379             canvas.drawBitmap(cache, 0.0f, 0.0f, cachePaint);
   14380         }
   14381 
   14382         if (restoreTo >= 0) {
   14383             canvas.restoreToCount(restoreTo);
   14384         }
   14385 
   14386         if (a != null && !more) {
   14387             if (!hardwareAccelerated && !a.getFillAfter()) {
   14388                 onSetAlpha(255);
   14389             }
   14390             parent.finishAnimatingView(this, a);
   14391         }
   14392 
   14393         if (more && hardwareAccelerated) {
   14394             if (a.hasAlpha() && (mPrivateFlags & PFLAG_ALPHA_SET) == PFLAG_ALPHA_SET) {
   14395                 // alpha animations should cause the child to recreate its display list
   14396                 invalidate(true);
   14397             }
   14398         }
   14399 
   14400         mRecreateDisplayList = false;
   14401 
   14402         return more;
   14403     }
   14404 
   14405     /**
   14406      * Manually render this view (and all of its children) to the given Canvas.
   14407      * The view must have already done a full layout before this function is
   14408      * called.  When implementing a view, implement
   14409      * {@link #onDraw(android.graphics.Canvas)} instead of overriding this method.
   14410      * If you do need to override this method, call the superclass version.
   14411      *
   14412      * @param canvas The Canvas to which the View is rendered.
   14413      */
   14414     public void draw(Canvas canvas) {
   14415         if (mClipBounds != null) {
   14416             canvas.clipRect(mClipBounds);
   14417         }
   14418         final int privateFlags = mPrivateFlags;
   14419         final boolean dirtyOpaque = (privateFlags & PFLAG_DIRTY_MASK) == PFLAG_DIRTY_OPAQUE &&
   14420                 (mAttachInfo == null || !mAttachInfo.mIgnoreDirtyState);
   14421         mPrivateFlags = (privateFlags & ~PFLAG_DIRTY_MASK) | PFLAG_DRAWN;
   14422 
   14423         /*
   14424          * Draw traversal performs several drawing steps which must be executed
   14425          * in the appropriate order:
   14426          *
   14427          *      1. Draw the background
   14428          *      2. If necessary, save the canvas' layers to prepare for fading
   14429          *      3. Draw view's content
   14430          *      4. Draw children
   14431          *      5. If necessary, draw the fading edges and restore layers
   14432          *      6. Draw decorations (scrollbars for instance)
   14433          */
   14434 
   14435         // Step 1, draw the background, if needed
   14436         int saveCount;
   14437 
   14438         if (!dirtyOpaque) {
   14439             final Drawable background = mBackground;
   14440             if (background != null) {
   14441                 final int scrollX = mScrollX;
   14442                 final int scrollY = mScrollY;
   14443 
   14444                 if (mBackgroundSizeChanged) {
   14445                     background.setBounds(0, 0,  mRight - mLeft, mBottom - mTop);
   14446                     mBackgroundSizeChanged = false;
   14447                 }
   14448 
   14449                 if ((scrollX | scrollY) == 0) {
   14450                     background.draw(canvas);
   14451                 } else {
   14452                     canvas.translate(scrollX, scrollY);
   14453                     background.draw(canvas);
   14454                     canvas.translate(-scrollX, -scrollY);
   14455                 }
   14456             }
   14457         }
   14458 
   14459         // skip step 2 & 5 if possible (common case)
   14460         final int viewFlags = mViewFlags;
   14461         boolean horizontalEdges = (viewFlags & FADING_EDGE_HORIZONTAL) != 0;
   14462         boolean verticalEdges = (viewFlags & FADING_EDGE_VERTICAL) != 0;
   14463         if (!verticalEdges && !horizontalEdges) {
   14464             // Step 3, draw the content
   14465             if (!dirtyOpaque) onDraw(canvas);
   14466 
   14467             // Step 4, draw the children
   14468             dispatchDraw(canvas);
   14469 
   14470             // Step 6, draw decorations (scrollbars)
   14471             onDrawScrollBars(canvas);
   14472 
   14473             if (mOverlay != null && !mOverlay.isEmpty()) {
   14474                 mOverlay.getOverlayView().dispatchDraw(canvas);
   14475             }
   14476 
   14477             // we're done...
   14478             return;
   14479         }
   14480 
   14481         /*
   14482          * Here we do the full fledged routine...
   14483          * (this is an uncommon case where speed matters less,
   14484          * this is why we repeat some of the tests that have been
   14485          * done above)
   14486          */
   14487 
   14488         boolean drawTop = false;
   14489         boolean drawBottom = false;
   14490         boolean drawLeft = false;
   14491         boolean drawRight = false;
   14492 
   14493         float topFadeStrength = 0.0f;
   14494         float bottomFadeStrength = 0.0f;
   14495         float leftFadeStrength = 0.0f;
   14496         float rightFadeStrength = 0.0f;
   14497 
   14498         // Step 2, save the canvas' layers
   14499         int paddingLeft = mPaddingLeft;
   14500 
   14501         final boolean offsetRequired = isPaddingOffsetRequired();
   14502         if (offsetRequired) {
   14503             paddingLeft += getLeftPaddingOffset();
   14504         }
   14505 
   14506         int left = mScrollX + paddingLeft;
   14507         int right = left + mRight - mLeft - mPaddingRight - paddingLeft;
   14508         int top = mScrollY + getFadeTop(offsetRequired);
   14509         int bottom = top + getFadeHeight(offsetRequired);
   14510 
   14511         if (offsetRequired) {
   14512             right += getRightPaddingOffset();
   14513             bottom += getBottomPaddingOffset();
   14514         }
   14515 
   14516         final ScrollabilityCache scrollabilityCache = mScrollCache;
   14517         final float fadeHeight = scrollabilityCache.fadingEdgeLength;
   14518         int length = (int) fadeHeight;
   14519 
   14520         // clip the fade length if top and bottom fades overlap
   14521         // overlapping fades produce odd-looking artifacts
   14522         if (verticalEdges && (top + length > bottom - length)) {
   14523             length = (bottom - top) / 2;
   14524         }
   14525 
   14526         // also clip horizontal fades if necessary
   14527         if (horizontalEdges && (left + length > right - length)) {
   14528             length = (right - left) / 2;
   14529         }
   14530 
   14531         if (verticalEdges) {
   14532             topFadeStrength = Math.max(0.0f, Math.min(1.0f, getTopFadingEdgeStrength()));
   14533             drawTop = topFadeStrength * fadeHeight > 1.0f;
   14534             bottomFadeStrength = Math.max(0.0f, Math.min(1.0f, getBottomFadingEdgeStrength()));
   14535             drawBottom = bottomFadeStrength * fadeHeight > 1.0f;
   14536         }
   14537 
   14538         if (horizontalEdges) {
   14539             leftFadeStrength = Math.max(0.0f, Math.min(1.0f, getLeftFadingEdgeStrength()));
   14540             drawLeft = leftFadeStrength * fadeHeight > 1.0f;
   14541             rightFadeStrength = Math.max(0.0f, Math.min(1.0f, getRightFadingEdgeStrength()));
   14542             drawRight = rightFadeStrength * fadeHeight > 1.0f;
   14543         }
   14544 
   14545         saveCount = canvas.getSaveCount();
   14546 
   14547         int solidColor = getSolidColor();
   14548         if (solidColor == 0) {
   14549             final int flags = Canvas.HAS_ALPHA_LAYER_SAVE_FLAG;
   14550 
   14551             if (drawTop) {
   14552                 canvas.saveLayer(left, top, right, top + length, null, flags);
   14553             }
   14554 
   14555             if (drawBottom) {
   14556                 canvas.saveLayer(left, bottom - length, right, bottom, null, flags);
   14557             }
   14558 
   14559             if (drawLeft) {
   14560                 canvas.saveLayer(left, top, left + length, bottom, null, flags);
   14561             }
   14562 
   14563             if (drawRight) {
   14564                 canvas.saveLayer(right - length, top, right, bottom, null, flags);
   14565             }
   14566         } else {
   14567             scrollabilityCache.setFadeColor(solidColor);
   14568         }
   14569 
   14570         // Step 3, draw the content
   14571         if (!dirtyOpaque) onDraw(canvas);
   14572 
   14573         // Step 4, draw the children
   14574         dispatchDraw(canvas);
   14575 
   14576         // Step 5, draw the fade effect and restore layers
   14577         final Paint p = scrollabilityCache.paint;
   14578         final Matrix matrix = scrollabilityCache.matrix;
   14579         final Shader fade = scrollabilityCache.shader;
   14580 
   14581         if (drawTop) {
   14582             matrix.setScale(1, fadeHeight * topFadeStrength);
   14583             matrix.postTranslate(left, top);
   14584             fade.setLocalMatrix(matrix);
   14585             canvas.drawRect(left, top, right, top + length, p);
   14586         }
   14587 
   14588         if (drawBottom) {
   14589             matrix.setScale(1, fadeHeight * bottomFadeStrength);
   14590             matrix.postRotate(180);
   14591             matrix.postTranslate(left, bottom);
   14592             fade.setLocalMatrix(matrix);
   14593             canvas.drawRect(left, bottom - length, right, bottom, p);
   14594         }
   14595 
   14596         if (drawLeft) {
   14597             matrix.setScale(1, fadeHeight * leftFadeStrength);
   14598             matrix.postRotate(-90);
   14599             matrix.postTranslate(left, top);
   14600             fade.setLocalMatrix(matrix);
   14601             canvas.drawRect(left, top, left + length, bottom, p);
   14602         }
   14603 
   14604         if (drawRight) {
   14605             matrix.setScale(1, fadeHeight * rightFadeStrength);
   14606             matrix.postRotate(90);
   14607             matrix.postTranslate(right, top);
   14608             fade.setLocalMatrix(matrix);
   14609             canvas.drawRect(right - length, top, right, bottom, p);
   14610         }
   14611 
   14612         canvas.restoreToCount(saveCount);
   14613 
   14614         // Step 6, draw decorations (scrollbars)
   14615         onDrawScrollBars(canvas);
   14616 
   14617         if (mOverlay != null && !mOverlay.isEmpty()) {
   14618             mOverlay.getOverlayView().dispatchDraw(canvas);
   14619         }
   14620     }
   14621 
   14622     /**
   14623      * Returns the overlay for this view, creating it if it does not yet exist.
   14624      * Adding drawables to the overlay will cause them to be displayed whenever
   14625      * the view itself is redrawn. Objects in the overlay should be actively
   14626      * managed: remove them when they should not be displayed anymore. The
   14627      * overlay will always have the same size as its host view.
   14628      *
   14629      * <p>Note: Overlays do not currently work correctly with {@link
   14630      * SurfaceView} or {@link TextureView}; contents in overlays for these
   14631      * types of views may not display correctly.</p>
   14632      *
   14633      * @return The ViewOverlay object for this view.
   14634      * @see ViewOverlay
   14635      */
   14636     public ViewOverlay getOverlay() {
   14637         if (mOverlay == null) {
   14638             mOverlay = new ViewOverlay(mContext, this);
   14639         }
   14640         return mOverlay;
   14641     }
   14642 
   14643     /**
   14644      * Override this if your view is known to always be drawn on top of a solid color background,
   14645      * and needs to draw fading edges. Returning a non-zero color enables the view system to
   14646      * optimize the drawing of the fading edges. If you do return a non-zero color, the alpha
   14647      * should be set to 0xFF.
   14648      *
   14649      * @see #setVerticalFadingEdgeEnabled(boolean)
   14650      * @see #setHorizontalFadingEdgeEnabled(boolean)
   14651      *
   14652      * @return The known solid color background for this view, or 0 if the color may vary
   14653      */
   14654     @ViewDebug.ExportedProperty(category = "drawing")
   14655     public int getSolidColor() {
   14656         return 0;
   14657     }
   14658 
   14659     /**
   14660      * Build a human readable string representation of the specified view flags.
   14661      *
   14662      * @param flags the view flags to convert to a string
   14663      * @return a String representing the supplied flags
   14664      */
   14665     private static String printFlags(int flags) {
   14666         String output = "";
   14667         int numFlags = 0;
   14668         if ((flags & FOCUSABLE_MASK) == FOCUSABLE) {
   14669             output += "TAKES_FOCUS";
   14670             numFlags++;
   14671         }
   14672 
   14673         switch (flags & VISIBILITY_MASK) {
   14674         case INVISIBLE:
   14675             if (numFlags > 0) {
   14676                 output += " ";
   14677             }
   14678             output += "INVISIBLE";
   14679             // USELESS HERE numFlags++;
   14680             break;
   14681         case GONE:
   14682             if (numFlags > 0) {
   14683                 output += " ";
   14684             }
   14685             output += "GONE";
   14686             // USELESS HERE numFlags++;
   14687             break;
   14688         default:
   14689             break;
   14690         }
   14691         return output;
   14692     }
   14693 
   14694     /**
   14695      * Build a human readable string representation of the specified private
   14696      * view flags.
   14697      *
   14698      * @param privateFlags the private view flags to convert to a string
   14699      * @return a String representing the supplied flags
   14700      */
   14701     private static String printPrivateFlags(int privateFlags) {
   14702         String output = "";
   14703         int numFlags = 0;
   14704 
   14705         if ((privateFlags & PFLAG_WANTS_FOCUS) == PFLAG_WANTS_FOCUS) {
   14706             output += "WANTS_FOCUS";
   14707             numFlags++;
   14708         }
   14709 
   14710         if ((privateFlags & PFLAG_FOCUSED) == PFLAG_FOCUSED) {
   14711             if (numFlags > 0) {
   14712                 output += " ";
   14713             }
   14714             output += "FOCUSED";
   14715             numFlags++;
   14716         }
   14717 
   14718         if ((privateFlags & PFLAG_SELECTED) == PFLAG_SELECTED) {
   14719             if (numFlags > 0) {
   14720                 output += " ";
   14721             }
   14722             output += "SELECTED";
   14723             numFlags++;
   14724         }
   14725 
   14726         if ((privateFlags & PFLAG_IS_ROOT_NAMESPACE) == PFLAG_IS_ROOT_NAMESPACE) {
   14727             if (numFlags > 0) {
   14728                 output += " ";
   14729             }
   14730             output += "IS_ROOT_NAMESPACE";
   14731             numFlags++;
   14732         }
   14733 
   14734         if ((privateFlags & PFLAG_HAS_BOUNDS) == PFLAG_HAS_BOUNDS) {
   14735             if (numFlags > 0) {
   14736                 output += " ";
   14737             }
   14738             output += "HAS_BOUNDS";
   14739             numFlags++;
   14740         }
   14741 
   14742         if ((privateFlags & PFLAG_DRAWN) == PFLAG_DRAWN) {
   14743             if (numFlags > 0) {
   14744                 output += " ";
   14745             }
   14746             output += "DRAWN";
   14747             // USELESS HERE numFlags++;
   14748         }
   14749         return output;
   14750     }
   14751 
   14752     /**
   14753      * <p>Indicates whether or not this view's layout will be requested during
   14754      * the next hierarchy layout pass.</p>
   14755      *
   14756      * @return true if the layout will be forced during next layout pass
   14757      */
   14758     public boolean isLayoutRequested() {
   14759         return (mPrivateFlags & PFLAG_FORCE_LAYOUT) == PFLAG_FORCE_LAYOUT;
   14760     }
   14761 
   14762     /**
   14763      * Return true if o is a ViewGroup that is laying out using optical bounds.
   14764      * @hide
   14765      */
   14766     public static boolean isLayoutModeOptical(Object o) {
   14767         return o instanceof ViewGroup && ((ViewGroup) o).isLayoutModeOptical();
   14768     }
   14769 
   14770     private boolean setOpticalFrame(int left, int top, int right, int bottom) {
   14771         Insets parentInsets = mParent instanceof View ?
   14772                 ((View) mParent).getOpticalInsets() : Insets.NONE;
   14773         Insets childInsets = getOpticalInsets();
   14774         return setFrame(
   14775                 left   + parentInsets.left - childInsets.left,
   14776                 top    + parentInsets.top  - childInsets.top,
   14777                 right  + parentInsets.left + childInsets.right,
   14778                 bottom + parentInsets.top  + childInsets.bottom);
   14779     }
   14780 
   14781     /**
   14782      * Assign a size and position to a view and all of its
   14783      * descendants
   14784      *
   14785      * <p>This is the second phase of the layout mechanism.
   14786      * (The first is measuring). In this phase, each parent calls
   14787      * layout on all of its children to position them.
   14788      * This is typically done using the child measurements
   14789      * that were stored in the measure pass().</p>
   14790      *
   14791      * <p>Derived classes should not override this method.
   14792      * Derived classes with children should override
   14793      * onLayout. In that method, they should
   14794      * call layout on each of their children.</p>
   14795      *
   14796      * @param l Left position, relative to parent
   14797      * @param t Top position, relative to parent
   14798      * @param r Right position, relative to parent
   14799      * @param b Bottom position, relative to parent
   14800      */
   14801     @SuppressWarnings({"unchecked"})
   14802     public void layout(int l, int t, int r, int b) {
   14803         if ((mPrivateFlags3 & PFLAG3_MEASURE_NEEDED_BEFORE_LAYOUT) != 0) {
   14804             onMeasure(mOldWidthMeasureSpec, mOldHeightMeasureSpec);
   14805             mPrivateFlags3 &= ~PFLAG3_MEASURE_NEEDED_BEFORE_LAYOUT;
   14806         }
   14807 
   14808         int oldL = mLeft;
   14809         int oldT = mTop;
   14810         int oldB = mBottom;
   14811         int oldR = mRight;
   14812 
   14813         boolean changed = isLayoutModeOptical(mParent) ?
   14814                 setOpticalFrame(l, t, r, b) : setFrame(l, t, r, b);
   14815 
   14816         if (changed || (mPrivateFlags & PFLAG_LAYOUT_REQUIRED) == PFLAG_LAYOUT_REQUIRED) {
   14817             onLayout(changed, l, t, r, b);
   14818             mPrivateFlags &= ~PFLAG_LAYOUT_REQUIRED;
   14819 
   14820             ListenerInfo li = mListenerInfo;
   14821             if (li != null && li.mOnLayoutChangeListeners != null) {
   14822                 ArrayList<OnLayoutChangeListener> listenersCopy =
   14823                         (ArrayList<OnLayoutChangeListener>)li.mOnLayoutChangeListeners.clone();
   14824                 int numListeners = listenersCopy.size();
   14825                 for (int i = 0; i < numListeners; ++i) {
   14826                     listenersCopy.get(i).onLayoutChange(this, l, t, r, b, oldL, oldT, oldR, oldB);
   14827                 }
   14828             }
   14829         }
   14830 
   14831         mPrivateFlags &= ~PFLAG_FORCE_LAYOUT;
   14832         mPrivateFlags3 |= PFLAG3_IS_LAID_OUT;
   14833     }
   14834 
   14835     /**
   14836      * Called from layout when this view should
   14837      * assign a size and position to each of its children.
   14838      *
   14839      * Derived classes with children should override
   14840      * this method and call layout on each of
   14841      * their children.
   14842      * @param changed This is a new size or position for this view
   14843      * @param left Left position, relative to parent
   14844      * @param top Top position, relative to parent
   14845      * @param right Right position, relative to parent
   14846      * @param bottom Bottom position, relative to parent
   14847      */
   14848     protected void onLayout(boolean changed, int left, int top, int right, int bottom) {
   14849     }
   14850 
   14851     /**
   14852      * Assign a size and position to this view.
   14853      *
   14854      * This is called from layout.
   14855      *
   14856      * @param left Left position, relative to parent
   14857      * @param top Top position, relative to parent
   14858      * @param right Right position, relative to parent
   14859      * @param bottom Bottom position, relative to parent
   14860      * @return true if the new size and position are different than the
   14861      *         previous ones
   14862      * {@hide}
   14863      */
   14864     protected boolean setFrame(int left, int top, int right, int bottom) {
   14865         boolean changed = false;
   14866 
   14867         if (DBG) {
   14868             Log.d("View", this + " View.setFrame(" + left + "," + top + ","
   14869                     + right + "," + bottom + ")");
   14870         }
   14871 
   14872         if (mLeft != left || mRight != right || mTop != top || mBottom != bottom) {
   14873             changed = true;
   14874 
   14875             // Remember our drawn bit
   14876             int drawn = mPrivateFlags & PFLAG_DRAWN;
   14877 
   14878             int oldWidth = mRight - mLeft;
   14879             int oldHeight = mBottom - mTop;
   14880             int newWidth = right - left;
   14881             int newHeight = bottom - top;
   14882             boolean sizeChanged = (newWidth != oldWidth) || (newHeight != oldHeight);
   14883 
   14884             // Invalidate our old position
   14885             invalidate(sizeChanged);
   14886 
   14887             mLeft = left;
   14888             mTop = top;
   14889             mRight = right;
   14890             mBottom = bottom;
   14891             if (mDisplayList != null) {
   14892                 mDisplayList.setLeftTopRightBottom(mLeft, mTop, mRight, mBottom);
   14893             }
   14894 
   14895             mPrivateFlags |= PFLAG_HAS_BOUNDS;
   14896 
   14897 
   14898             if (sizeChanged) {
   14899                 if ((mPrivateFlags & PFLAG_PIVOT_EXPLICITLY_SET) == 0) {
   14900                     // A change in dimension means an auto-centered pivot point changes, too
   14901                     if (mTransformationInfo != null) {
   14902                         mTransformationInfo.mMatrixDirty = true;
   14903                     }
   14904                 }
   14905                 sizeChange(newWidth, newHeight, oldWidth, oldHeight);
   14906             }
   14907 
   14908             if ((mViewFlags & VISIBILITY_MASK) == VISIBLE) {
   14909                 // If we are visible, force the DRAWN bit to on so that
   14910                 // this invalidate will go through (at least to our parent).
   14911                 // This is because someone may have invalidated this view
   14912                 // before this call to setFrame came in, thereby clearing
   14913                 // the DRAWN bit.
   14914                 mPrivateFlags |= PFLAG_DRAWN;
   14915                 invalidate(sizeChanged);
   14916                 // parent display list may need to be recreated based on a change in the bounds
   14917                 // of any child
   14918                 invalidateParentCaches();
   14919             }
   14920 
   14921             // Reset drawn bit to original value (invalidate turns it off)
   14922             mPrivateFlags |= drawn;
   14923 
   14924             mBackgroundSizeChanged = true;
   14925 
   14926             notifySubtreeAccessibilityStateChangedIfNeeded();
   14927         }
   14928         return changed;
   14929     }
   14930 
   14931     private void sizeChange(int newWidth, int newHeight, int oldWidth, int oldHeight) {
   14932         onSizeChanged(newWidth, newHeight, oldWidth, oldHeight);
   14933         if (mOverlay != null) {
   14934             mOverlay.getOverlayView().setRight(newWidth);
   14935             mOverlay.getOverlayView().setBottom(newHeight);
   14936         }
   14937     }
   14938 
   14939     /**
   14940      * Finalize inflating a view from XML.  This is called as the last phase
   14941      * of inflation, after all child views have been added.
   14942      *
   14943      * <p>Even if the subclass overrides onFinishInflate, they should always be
   14944      * sure to call the super method, so that we get called.
   14945      */
   14946     protected void onFinishInflate() {
   14947     }
   14948 
   14949     /**
   14950      * Returns the resources associated with this view.
   14951      *
   14952      * @return Resources object.
   14953      */
   14954     public Resources getResources() {
   14955         return mResources;
   14956     }
   14957 
   14958     /**
   14959      * Invalidates the specified Drawable.
   14960      *
   14961      * @param drawable the drawable to invalidate
   14962      */
   14963     public void invalidateDrawable(Drawable drawable) {
   14964         if (verifyDrawable(drawable)) {
   14965             final Rect dirty = drawable.getBounds();
   14966             final int scrollX = mScrollX;
   14967             final int scrollY = mScrollY;
   14968 
   14969             invalidate(dirty.left + scrollX, dirty.top + scrollY,
   14970                     dirty.right + scrollX, dirty.bottom + scrollY);
   14971         }
   14972     }
   14973 
   14974     /**
   14975      * Schedules an action on a drawable to occur at a specified time.
   14976      *
   14977      * @param who the recipient of the action
   14978      * @param what the action to run on the drawable
   14979      * @param when the time at which the action must occur. Uses the
   14980      *        {@link SystemClock#uptimeMillis} timebase.
   14981      */
   14982     public void scheduleDrawable(Drawable who, Runnable what, long when) {
   14983         if (verifyDrawable(who) && what != null) {
   14984             final long delay = when - SystemClock.uptimeMillis();
   14985             if (mAttachInfo != null) {
   14986                 mAttachInfo.mViewRootImpl.mChoreographer.postCallbackDelayed(
   14987                         Choreographer.CALLBACK_ANIMATION, what, who,
   14988                         Choreographer.subtractFrameDelay(delay));
   14989             } else {
   14990                 ViewRootImpl.getRunQueue().postDelayed(what, delay);
   14991             }
   14992         }
   14993     }
   14994 
   14995     /**
   14996      * Cancels a scheduled action on a drawable.
   14997      *
   14998      * @param who the recipient of the action
   14999      * @param what the action to cancel
   15000      */
   15001     public void unscheduleDrawable(Drawable who, Runnable what) {
   15002         if (verifyDrawable(who) && what != null) {
   15003             if (mAttachInfo != null) {
   15004                 mAttachInfo.mViewRootImpl.mChoreographer.removeCallbacks(
   15005                         Choreographer.CALLBACK_ANIMATION, what, who);
   15006             } else {
   15007                 ViewRootImpl.getRunQueue().removeCallbacks(what);
   15008             }
   15009         }
   15010     }
   15011 
   15012     /**
   15013      * Unschedule any events associated with the given Drawable.  This can be
   15014      * used when selecting a new Drawable into a view, so that the previous
   15015      * one is completely unscheduled.
   15016      *
   15017      * @param who The Drawable to unschedule.
   15018      *
   15019      * @see #drawableStateChanged
   15020      */
   15021     public void unscheduleDrawable(Drawable who) {
   15022         if (mAttachInfo != null && who != null) {
   15023             mAttachInfo.mViewRootImpl.mChoreographer.removeCallbacks(
   15024                     Choreographer.CALLBACK_ANIMATION, null, who);
   15025         }
   15026     }
   15027 
   15028     /**
   15029      * Resolve the Drawables depending on the layout direction. This is implicitly supposing
   15030      * that the View directionality can and will be resolved before its Drawables.
   15031      *
   15032      * Will call {@link View#onResolveDrawables} when resolution is done.
   15033      *
   15034      * @hide
   15035      */
   15036     protected void resolveDrawables() {
   15037         // Drawables resolution may need to happen before resolving the layout direction (which is
   15038         // done only during the measure() call).
   15039         // If the layout direction is not resolved yet, we cannot resolve the Drawables except in
   15040         // one case: when the raw layout direction has not been defined as LAYOUT_DIRECTION_INHERIT.
   15041         // So, if the raw layout direction is LAYOUT_DIRECTION_LTR or LAYOUT_DIRECTION_RTL or
   15042         // LAYOUT_DIRECTION_LOCALE, we can "cheat" and we don't need to wait for the layout
   15043         // direction to be resolved as its resolved value will be the same as its raw value.
   15044         if (!isLayoutDirectionResolved() &&
   15045                 getRawLayoutDirection() == View.LAYOUT_DIRECTION_INHERIT) {
   15046             return;
   15047         }
   15048 
   15049         final int layoutDirection = isLayoutDirectionResolved() ?
   15050                 getLayoutDirection() : getRawLayoutDirection();
   15051 
   15052         if (mBackground != null) {
   15053             mBackground.setLayoutDirection(layoutDirection);
   15054         }
   15055         mPrivateFlags2 |= PFLAG2_DRAWABLE_RESOLVED;
   15056         onResolveDrawables(layoutDirection);
   15057     }
   15058 
   15059     /**
   15060      * Called when layout direction has been resolved.
   15061      *
   15062      * The default implementation does nothing.
   15063      *
   15064      * @param layoutDirection The resolved layout direction.
   15065      *
   15066      * @see #LAYOUT_DIRECTION_LTR
   15067      * @see #LAYOUT_DIRECTION_RTL
   15068      *
   15069      * @hide
   15070      */
   15071     public void onResolveDrawables(int layoutDirection) {
   15072     }
   15073 
   15074     /**
   15075      * @hide
   15076      */
   15077     protected void resetResolvedDrawables() {
   15078         mPrivateFlags2 &= ~PFLAG2_DRAWABLE_RESOLVED;
   15079     }
   15080 
   15081     private boolean isDrawablesResolved() {
   15082         return (mPrivateFlags2 & PFLAG2_DRAWABLE_RESOLVED) == PFLAG2_DRAWABLE_RESOLVED;
   15083     }
   15084 
   15085     /**
   15086      * If your view subclass is displaying its own Drawable objects, it should
   15087      * override this function and return true for any Drawable it is
   15088      * displaying.  This allows animations for those drawables to be
   15089      * scheduled.
   15090      *
   15091      * <p>Be sure to call through to the super class when overriding this
   15092      * function.
   15093      *
   15094      * @param who The Drawable to verify.  Return true if it is one you are
   15095      *            displaying, else return the result of calling through to the
   15096      *            super class.
   15097      *
   15098      * @return boolean If true than the Drawable is being displayed in the
   15099      *         view; else false and it is not allowed to animate.
   15100      *
   15101      * @see #unscheduleDrawable(android.graphics.drawable.Drawable)
   15102      * @see #drawableStateChanged()
   15103      */
   15104     protected boolean verifyDrawable(Drawable who) {
   15105         return who == mBackground;
   15106     }
   15107 
   15108     /**
   15109      * This function is called whenever the state of the view changes in such
   15110      * a way that it impacts the state of drawables being shown.
   15111      *
   15112      * <p>Be sure to call through to the superclass when overriding this
   15113      * function.
   15114      *
   15115      * @see Drawable#setState(int[])
   15116      */
   15117     protected void drawableStateChanged() {
   15118         Drawable d = mBackground;
   15119         if (d != null && d.isStateful()) {
   15120             d.setState(getDrawableState());
   15121         }
   15122     }
   15123 
   15124     /**
   15125      * Call this to force a view to update its drawable state. This will cause
   15126      * drawableStateChanged to be called on this view. Views that are interested
   15127      * in the new state should call getDrawableState.
   15128      *
   15129      * @see #drawableStateChanged
   15130      * @see #getDrawableState
   15131      */
   15132     public void refreshDrawableState() {
   15133         mPrivateFlags |= PFLAG_DRAWABLE_STATE_DIRTY;
   15134         drawableStateChanged();
   15135 
   15136         ViewParent parent = mParent;
   15137         if (parent != null) {
   15138             parent.childDrawableStateChanged(this);
   15139         }
   15140     }
   15141 
   15142     /**
   15143      * Return an array of resource IDs of the drawable states representing the
   15144      * current state of the view.
   15145      *
   15146      * @return The current drawable state
   15147      *
   15148      * @see Drawable#setState(int[])
   15149      * @see #drawableStateChanged()
   15150      * @see #onCreateDrawableState(int)
   15151      */
   15152     public final int[] getDrawableState() {
   15153         if ((mDrawableState != null) && ((mPrivateFlags & PFLAG_DRAWABLE_STATE_DIRTY) == 0)) {
   15154             return mDrawableState;
   15155         } else {
   15156             mDrawableState = onCreateDrawableState(0);
   15157             mPrivateFlags &= ~PFLAG_DRAWABLE_STATE_DIRTY;
   15158             return mDrawableState;
   15159         }
   15160     }
   15161 
   15162     /**
   15163      * Generate the new {@link android.graphics.drawable.Drawable} state for
   15164      * this view. This is called by the view
   15165      * system when the cached Drawable state is determined to be invalid.  To
   15166      * retrieve the current state, you should use {@link #getDrawableState}.
   15167      *
   15168      * @param extraSpace if non-zero, this is the number of extra entries you
   15169      * would like in the returned array in which you can place your own
   15170      * states.
   15171      *
   15172      * @return Returns an array holding the current {@link Drawable} state of
   15173      * the view.
   15174      *
   15175      * @see #mergeDrawableStates(int[], int[])
   15176      */
   15177     protected int[] onCreateDrawableState(int extraSpace) {
   15178         if ((mViewFlags & DUPLICATE_PARENT_STATE) == DUPLICATE_PARENT_STATE &&
   15179                 mParent instanceof View) {
   15180             return ((View) mParent).onCreateDrawableState(extraSpace);
   15181         }
   15182 
   15183         int[] drawableState;
   15184 
   15185         int privateFlags = mPrivateFlags;
   15186 
   15187         int viewStateIndex = 0;
   15188         if ((privateFlags & PFLAG_PRESSED) != 0) viewStateIndex |= VIEW_STATE_PRESSED;
   15189         if ((mViewFlags & ENABLED_MASK) == ENABLED) viewStateIndex |= VIEW_STATE_ENABLED;
   15190         if (isFocused()) viewStateIndex |= VIEW_STATE_FOCUSED;
   15191         if ((privateFlags & PFLAG_SELECTED) != 0) viewStateIndex |= VIEW_STATE_SELECTED;
   15192         if (hasWindowFocus()) viewStateIndex |= VIEW_STATE_WINDOW_FOCUSED;
   15193         if ((privateFlags & PFLAG_ACTIVATED) != 0) viewStateIndex |= VIEW_STATE_ACTIVATED;
   15194         if (mAttachInfo != null && mAttachInfo.mHardwareAccelerationRequested &&
   15195                 HardwareRenderer.isAvailable()) {
   15196             // This is set if HW acceleration is requested, even if the current
   15197             // process doesn't allow it.  This is just to allow app preview
   15198             // windows to better match their app.
   15199             viewStateIndex |= VIEW_STATE_ACCELERATED;
   15200         }
   15201         if ((privateFlags & PFLAG_HOVERED) != 0) viewStateIndex |= VIEW_STATE_HOVERED;
   15202 
   15203         final int privateFlags2 = mPrivateFlags2;
   15204         if ((privateFlags2 & PFLAG2_DRAG_CAN_ACCEPT) != 0) viewStateIndex |= VIEW_STATE_DRAG_CAN_ACCEPT;
   15205         if ((privateFlags2 & PFLAG2_DRAG_HOVERED) != 0) viewStateIndex |= VIEW_STATE_DRAG_HOVERED;
   15206 
   15207         drawableState = VIEW_STATE_SETS[viewStateIndex];
   15208 
   15209         //noinspection ConstantIfStatement
   15210         if (false) {
   15211             Log.i("View", "drawableStateIndex=" + viewStateIndex);
   15212             Log.i("View", toString()
   15213                     + " pressed=" + ((privateFlags & PFLAG_PRESSED) != 0)
   15214                     + " en=" + ((mViewFlags & ENABLED_MASK) == ENABLED)
   15215                     + " fo=" + hasFocus()
   15216                     + " sl=" + ((privateFlags & PFLAG_SELECTED) != 0)
   15217                     + " wf=" + hasWindowFocus()
   15218                     + ": " + Arrays.toString(drawableState));
   15219         }
   15220 
   15221         if (extraSpace == 0) {
   15222             return drawableState;
   15223         }
   15224 
   15225         final int[] fullState;
   15226         if (drawableState != null) {
   15227             fullState = new int[drawableState.length + extraSpace];
   15228             System.arraycopy(drawableState, 0, fullState, 0, drawableState.length);
   15229         } else {
   15230             fullState = new int[extraSpace];
   15231         }
   15232 
   15233         return fullState;
   15234     }
   15235 
   15236     /**
   15237      * Merge your own state values in <var>additionalState</var> into the base
   15238      * state values <var>baseState</var> that were returned by
   15239      * {@link #onCreateDrawableState(int)}.
   15240      *
   15241      * @param baseState The base state values returned by
   15242      * {@link #onCreateDrawableState(int)}, which will be modified to also hold your
   15243      * own additional state values.
   15244      *
   15245      * @param additionalState The additional state values you would like
   15246      * added to <var>baseState</var>; this array is not modified.
   15247      *
   15248      * @return As a convenience, the <var>baseState</var> array you originally
   15249      * passed into the function is returned.
   15250      *
   15251      * @see #onCreateDrawableState(int)
   15252      */
   15253     protected static int[] mergeDrawableStates(int[] baseState, int[] additionalState) {
   15254         final int N = baseState.length;
   15255         int i = N - 1;
   15256         while (i >= 0 && baseState[i] == 0) {
   15257             i--;
   15258         }
   15259         System.arraycopy(additionalState, 0, baseState, i + 1, additionalState.length);
   15260         return baseState;
   15261     }
   15262 
   15263     /**
   15264      * Call {@link Drawable#jumpToCurrentState() Drawable.jumpToCurrentState()}
   15265      * on all Drawable objects associated with this view.
   15266      */
   15267     public void jumpDrawablesToCurrentState() {
   15268         if (mBackground != null) {
   15269             mBackground.jumpToCurrentState();
   15270         }
   15271     }
   15272 
   15273     /**
   15274      * Sets the background color for this view.
   15275      * @param color the color of the background
   15276      */
   15277     @RemotableViewMethod
   15278     public void setBackgroundColor(int color) {
   15279         if (mBackground instanceof ColorDrawable) {
   15280             ((ColorDrawable) mBackground.mutate()).setColor(color);
   15281             computeOpaqueFlags();
   15282             mBackgroundResource = 0;
   15283         } else {
   15284             setBackground(new ColorDrawable(color));
   15285         }
   15286     }
   15287 
   15288     /**
   15289      * Set the background to a given resource. The resource should refer to
   15290      * a Drawable object or 0 to remove the background.
   15291      * @param resid The identifier of the resource.
   15292      *
   15293      * @attr ref android.R.styleable#View_background
   15294      */
   15295     @RemotableViewMethod
   15296     public void setBackgroundResource(int resid) {
   15297         if (resid != 0 && resid == mBackgroundResource) {
   15298             return;
   15299         }
   15300 
   15301         Drawable d= null;
   15302         if (resid != 0) {
   15303             d = mResources.getDrawable(resid);
   15304         }
   15305         setBackground(d);
   15306 
   15307         mBackgroundResource = resid;
   15308     }
   15309 
   15310     /**
   15311      * Set the background to a given Drawable, or remove the background. If the
   15312      * background has padding, this View's padding is set to the background's
   15313      * padding. However, when a background is removed, this View's padding isn't
   15314      * touched. If setting the padding is desired, please use
   15315      * {@link #setPadding(int, int, int, int)}.
   15316      *
   15317      * @param background The Drawable to use as the background, or null to remove the
   15318      *        background
   15319      */
   15320     public void setBackground(Drawable background) {
   15321         //noinspection deprecation
   15322         setBackgroundDrawable(background);
   15323     }
   15324 
   15325     /**
   15326      * @deprecated use {@link #setBackground(Drawable)} instead
   15327      */
   15328     @Deprecated
   15329     public void setBackgroundDrawable(Drawable background) {
   15330         computeOpaqueFlags();
   15331 
   15332         if (background == mBackground) {
   15333             return;
   15334         }
   15335 
   15336         boolean requestLayout = false;
   15337 
   15338         mBackgroundResource = 0;
   15339 
   15340         /*
   15341          * Regardless of whether we're setting a new background or not, we want
   15342          * to clear the previous drawable.
   15343          */
   15344         if (mBackground != null) {
   15345             mBackground.setCallback(null);
   15346             unscheduleDrawable(mBackground);
   15347         }
   15348 
   15349         if (background != null) {
   15350             Rect padding = sThreadLocal.get();
   15351             if (padding == null) {
   15352                 padding = new Rect();
   15353                 sThreadLocal.set(padding);
   15354             }
   15355             resetResolvedDrawables();
   15356             background.setLayoutDirection(getLayoutDirection());
   15357             if (background.getPadding(padding)) {
   15358                 resetResolvedPadding();
   15359                 switch (background.getLayoutDirection()) {
   15360                     case LAYOUT_DIRECTION_RTL:
   15361                         mUserPaddingLeftInitial = padding.right;
   15362                         mUserPaddingRightInitial = padding.left;
   15363                         internalSetPadding(padding.right, padding.top, padding.left, padding.bottom);
   15364                         break;
   15365                     case LAYOUT_DIRECTION_LTR:
   15366                     default:
   15367                         mUserPaddingLeftInitial = padding.left;
   15368                         mUserPaddingRightInitial = padding.right;
   15369                         internalSetPadding(padding.left, padding.top, padding.right, padding.bottom);
   15370                 }
   15371                 mLeftPaddingDefined = false;
   15372                 mRightPaddingDefined = false;
   15373             }
   15374 
   15375             // Compare the minimum sizes of the old Drawable and the new.  If there isn't an old or
   15376             // if it has a different minimum size, we should layout again
   15377             if (mBackground == null || mBackground.getMinimumHeight() != background.getMinimumHeight() ||
   15378                     mBackground.getMinimumWidth() != background.getMinimumWidth()) {
   15379                 requestLayout = true;
   15380             }
   15381 
   15382             background.setCallback(this);
   15383             if (background.isStateful()) {
   15384                 background.setState(getDrawableState());
   15385             }
   15386             background.setVisible(getVisibility() == VISIBLE, false);
   15387             mBackground = background;
   15388 
   15389             if ((mPrivateFlags & PFLAG_SKIP_DRAW) != 0) {
   15390                 mPrivateFlags &= ~PFLAG_SKIP_DRAW;
   15391                 mPrivateFlags |= PFLAG_ONLY_DRAWS_BACKGROUND;
   15392                 requestLayout = true;
   15393             }
   15394         } else {
   15395             /* Remove the background */
   15396             mBackground = null;
   15397 
   15398             if ((mPrivateFlags & PFLAG_ONLY_DRAWS_BACKGROUND) != 0) {
   15399                 /*
   15400                  * This view ONLY drew the background before and we're removing
   15401                  * the background, so now it won't draw anything
   15402                  * (hence we SKIP_DRAW)
   15403                  */
   15404                 mPrivateFlags &= ~PFLAG_ONLY_DRAWS_BACKGROUND;
   15405                 mPrivateFlags |= PFLAG_SKIP_DRAW;
   15406             }
   15407 
   15408             /*
   15409              * When the background is set, we try to apply its padding to this
   15410              * View. When the background is removed, we don't touch this View's
   15411              * padding. This is noted in the Javadocs. Hence, we don't need to
   15412              * requestLayout(), the invalidate() below is sufficient.
   15413              */
   15414 
   15415             // The old background's minimum size could have affected this
   15416             // View's layout, so let's requestLayout
   15417             requestLayout = true;
   15418         }
   15419 
   15420         computeOpaqueFlags();
   15421 
   15422         if (requestLayout) {
   15423             requestLayout();
   15424         }
   15425 
   15426         mBackgroundSizeChanged = true;
   15427         invalidate(true);
   15428     }
   15429 
   15430     /**
   15431      * Gets the background drawable
   15432      *
   15433      * @return The drawable used as the background for this view, if any.
   15434      *
   15435      * @see #setBackground(Drawable)
   15436      *
   15437      * @attr ref android.R.styleable#View_background
   15438      */
   15439     public Drawable getBackground() {
   15440         return mBackground;
   15441     }
   15442 
   15443     /**
   15444      * Sets the padding. The view may add on the space required to display
   15445      * the scrollbars, depending on the style and visibility of the scrollbars.
   15446      * So the values returned from {@link #getPaddingLeft}, {@link #getPaddingTop},
   15447      * {@link #getPaddingRight} and {@link #getPaddingBottom} may be different
   15448      * from the values set in this call.
   15449      *
   15450      * @attr ref android.R.styleable#View_padding
   15451      * @attr ref android.R.styleable#View_paddingBottom
   15452      * @attr ref android.R.styleable#View_paddingLeft
   15453      * @attr ref android.R.styleable#View_paddingRight
   15454      * @attr ref android.R.styleable#View_paddingTop
   15455      * @param left the left padding in pixels
   15456      * @param top the top padding in pixels
   15457      * @param right the right padding in pixels
   15458      * @param bottom the bottom padding in pixels
   15459      */
   15460     public void setPadding(int left, int top, int right, int bottom) {
   15461         resetResolvedPadding();
   15462 
   15463         mUserPaddingStart = UNDEFINED_PADDING;
   15464         mUserPaddingEnd = UNDEFINED_PADDING;
   15465 
   15466         mUserPaddingLeftInitial = left;
   15467         mUserPaddingRightInitial = right;
   15468 
   15469         mLeftPaddingDefined = true;
   15470         mRightPaddingDefined = true;
   15471 
   15472         internalSetPadding(left, top, right, bottom);
   15473     }
   15474 
   15475     /**
   15476      * @hide
   15477      */
   15478     protected void internalSetPadding(int left, int top, int right, int bottom) {
   15479         mUserPaddingLeft = left;
   15480         mUserPaddingRight = right;
   15481         mUserPaddingBottom = bottom;
   15482 
   15483         final int viewFlags = mViewFlags;
   15484         boolean changed = false;
   15485 
   15486         // Common case is there are no scroll bars.
   15487         if ((viewFlags & (SCROLLBARS_VERTICAL|SCROLLBARS_HORIZONTAL)) != 0) {
   15488             if ((viewFlags & SCROLLBARS_VERTICAL) != 0) {
   15489                 final int offset = (viewFlags & SCROLLBARS_INSET_MASK) == 0
   15490                         ? 0 : getVerticalScrollbarWidth();
   15491                 switch (mVerticalScrollbarPosition) {
   15492                     case SCROLLBAR_POSITION_DEFAULT:
   15493                         if (isLayoutRtl()) {
   15494                             left += offset;
   15495                         } else {
   15496                             right += offset;
   15497                         }
   15498                         break;
   15499                     case SCROLLBAR_POSITION_RIGHT:
   15500                         right += offset;
   15501                         break;
   15502                     case SCROLLBAR_POSITION_LEFT:
   15503                         left += offset;
   15504                         break;
   15505                 }
   15506             }
   15507             if ((viewFlags & SCROLLBARS_HORIZONTAL) != 0) {
   15508                 bottom += (viewFlags & SCROLLBARS_INSET_MASK) == 0
   15509                         ? 0 : getHorizontalScrollbarHeight();
   15510             }
   15511         }
   15512 
   15513         if (mPaddingLeft != left) {
   15514             changed = true;
   15515             mPaddingLeft = left;
   15516         }
   15517         if (mPaddingTop != top) {
   15518             changed = true;
   15519             mPaddingTop = top;
   15520         }
   15521         if (mPaddingRight != right) {
   15522             changed = true;
   15523             mPaddingRight = right;
   15524         }
   15525         if (mPaddingBottom != bottom) {
   15526             changed = true;
   15527             mPaddingBottom = bottom;
   15528         }
   15529 
   15530         if (changed) {
   15531             requestLayout();
   15532         }
   15533     }
   15534 
   15535     /**
   15536      * Sets the relative padding. The view may add on the space required to display
   15537      * the scrollbars, depending on the style and visibility of the scrollbars.
   15538      * So the values returned from {@link #getPaddingStart}, {@link #getPaddingTop},
   15539      * {@link #getPaddingEnd} and {@link #getPaddingBottom} may be different
   15540      * from the values set in this call.
   15541      *
   15542      * @attr ref android.R.styleable#View_padding
   15543      * @attr ref android.R.styleable#View_paddingBottom
   15544      * @attr ref android.R.styleable#View_paddingStart
   15545      * @attr ref android.R.styleable#View_paddingEnd
   15546      * @attr ref android.R.styleable#View_paddingTop
   15547      * @param start the start padding in pixels
   15548      * @param top the top padding in pixels
   15549      * @param end the end padding in pixels
   15550      * @param bottom the bottom padding in pixels
   15551      */
   15552     public void setPaddingRelative(int start, int top, int end, int bottom) {
   15553         resetResolvedPadding();
   15554 
   15555         mUserPaddingStart = start;
   15556         mUserPaddingEnd = end;
   15557         mLeftPaddingDefined = true;
   15558         mRightPaddingDefined = true;
   15559 
   15560         switch(getLayoutDirection()) {
   15561             case LAYOUT_DIRECTION_RTL:
   15562                 mUserPaddingLeftInitial = end;
   15563                 mUserPaddingRightInitial = start;
   15564                 internalSetPadding(end, top, start, bottom);
   15565                 break;
   15566             case LAYOUT_DIRECTION_LTR:
   15567             default:
   15568                 mUserPaddingLeftInitial = start;
   15569                 mUserPaddingRightInitial = end;
   15570                 internalSetPadding(start, top, end, bottom);
   15571         }
   15572     }
   15573 
   15574     /**
   15575      * Returns the top padding of this view.
   15576      *
   15577      * @return the top padding in pixels
   15578      */
   15579     public int getPaddingTop() {
   15580         return mPaddingTop;
   15581     }
   15582 
   15583     /**
   15584      * Returns the bottom padding of this view. If there are inset and enabled
   15585      * scrollbars, this value may include the space required to display the
   15586      * scrollbars as well.
   15587      *
   15588      * @return the bottom padding in pixels
   15589      */
   15590     public int getPaddingBottom() {
   15591         return mPaddingBottom;
   15592     }
   15593 
   15594     /**
   15595      * Returns the left padding of this view. If there are inset and enabled
   15596      * scrollbars, this value may include the space required to display the
   15597      * scrollbars as well.
   15598      *
   15599      * @return the left padding in pixels
   15600      */
   15601     public int getPaddingLeft() {
   15602         if (!isPaddingResolved()) {
   15603             resolvePadding();
   15604         }
   15605         return mPaddingLeft;
   15606     }
   15607 
   15608     /**
   15609      * Returns the start padding of this view depending on its resolved layout direction.
   15610      * If there are inset and enabled scrollbars, this value may include the space
   15611      * required to display the scrollbars as well.
   15612      *
   15613      * @return the start padding in pixels
   15614      */
   15615     public int getPaddingStart() {
   15616         if (!isPaddingResolved()) {
   15617             resolvePadding();
   15618         }
   15619         return (getLayoutDirection() == LAYOUT_DIRECTION_RTL) ?
   15620                 mPaddingRight : mPaddingLeft;
   15621     }
   15622 
   15623     /**
   15624      * Returns the right padding of this view. If there are inset and enabled
   15625      * scrollbars, this value may include the space required to display the
   15626      * scrollbars as well.
   15627      *
   15628      * @return the right padding in pixels
   15629      */
   15630     public int getPaddingRight() {
   15631         if (!isPaddingResolved()) {
   15632             resolvePadding();
   15633         }
   15634         return mPaddingRight;
   15635     }
   15636 
   15637     /**
   15638      * Returns the end padding of this view depending on its resolved layout direction.
   15639      * If there are inset and enabled scrollbars, this value may include the space
   15640      * required to display the scrollbars as well.
   15641      *
   15642      * @return the end padding in pixels
   15643      */
   15644     public int getPaddingEnd() {
   15645         if (!isPaddingResolved()) {
   15646             resolvePadding();
   15647         }
   15648         return (getLayoutDirection() == LAYOUT_DIRECTION_RTL) ?
   15649                 mPaddingLeft : mPaddingRight;
   15650     }
   15651 
   15652     /**
   15653      * Return if the padding as been set thru relative values
   15654      * {@link #setPaddingRelative(int, int, int, int)} or thru
   15655      * @attr ref android.R.styleable#View_paddingStart or
   15656      * @attr ref android.R.styleable#View_paddingEnd
   15657      *
   15658      * @return true if the padding is relative or false if it is not.
   15659      */
   15660     public boolean isPaddingRelative() {
   15661         return (mUserPaddingStart != UNDEFINED_PADDING || mUserPaddingEnd != UNDEFINED_PADDING);
   15662     }
   15663 
   15664     Insets computeOpticalInsets() {
   15665         return (mBackground == null) ? Insets.NONE : mBackground.getOpticalInsets();
   15666     }
   15667 
   15668     /**
   15669      * @hide
   15670      */
   15671     public void resetPaddingToInitialValues() {
   15672         if (isRtlCompatibilityMode()) {
   15673             mPaddingLeft = mUserPaddingLeftInitial;
   15674             mPaddingRight = mUserPaddingRightInitial;
   15675             return;
   15676         }
   15677         if (isLayoutRtl()) {
   15678             mPaddingLeft = (mUserPaddingEnd >= 0) ? mUserPaddingEnd : mUserPaddingLeftInitial;
   15679             mPaddingRight = (mUserPaddingStart >= 0) ? mUserPaddingStart : mUserPaddingRightInitial;
   15680         } else {
   15681             mPaddingLeft = (mUserPaddingStart >= 0) ? mUserPaddingStart : mUserPaddingLeftInitial;
   15682             mPaddingRight = (mUserPaddingEnd >= 0) ? mUserPaddingEnd : mUserPaddingRightInitial;
   15683         }
   15684     }
   15685 
   15686     /**
   15687      * @hide
   15688      */
   15689     public Insets getOpticalInsets() {
   15690         if (mLayoutInsets == null) {
   15691             mLayoutInsets = computeOpticalInsets();
   15692         }
   15693         return mLayoutInsets;
   15694     }
   15695 
   15696     /**
   15697      * Changes the selection state of this view. A view can be selected or not.
   15698      * Note that selection is not the same as focus. Views are typically
   15699      * selected in the context of an AdapterView like ListView or GridView;
   15700      * the selected view is the view that is highlighted.
   15701      *
   15702      * @param selected true if the view must be selected, false otherwise
   15703      */
   15704     public void setSelected(boolean selected) {
   15705         //noinspection DoubleNegation
   15706         if (((mPrivateFlags & PFLAG_SELECTED) != 0) != selected) {
   15707             mPrivateFlags = (mPrivateFlags & ~PFLAG_SELECTED) | (selected ? PFLAG_SELECTED : 0);
   15708             if (!selected) resetPressedState();
   15709             invalidate(true);
   15710             refreshDrawableState();
   15711             dispatchSetSelected(selected);
   15712             notifyViewAccessibilityStateChangedIfNeeded(
   15713                     AccessibilityEvent.CONTENT_CHANGE_TYPE_UNDEFINED);
   15714         }
   15715     }
   15716 
   15717     /**
   15718      * Dispatch setSelected to all of this View's children.
   15719      *
   15720      * @see #setSelected(boolean)
   15721      *
   15722      * @param selected The new selected state
   15723      */
   15724     protected void dispatchSetSelected(boolean selected) {
   15725     }
   15726 
   15727     /**
   15728      * Indicates the selection state of this view.
   15729      *
   15730      * @return true if the view is selected, false otherwise
   15731      */
   15732     @ViewDebug.ExportedProperty
   15733     public boolean isSelected() {
   15734         return (mPrivateFlags & PFLAG_SELECTED) != 0;
   15735     }
   15736 
   15737     /**
   15738      * Changes the activated state of this view. A view can be activated or not.
   15739      * Note that activation is not the same as selection.  Selection is
   15740      * a transient property, representing the view (hierarchy) the user is
   15741      * currently interacting with.  Activation is a longer-term state that the
   15742      * user can move views in and out of.  For example, in a list view with
   15743      * single or multiple selection enabled, the views in the current selection
   15744      * set are activated.  (Um, yeah, we are deeply sorry about the terminology
   15745      * here.)  The activated state is propagated down to children of the view it
   15746      * is set on.
   15747      *
   15748      * @param activated true if the view must be activated, false otherwise
   15749      */
   15750     public void setActivated(boolean activated) {
   15751         //noinspection DoubleNegation
   15752         if (((mPrivateFlags & PFLAG_ACTIVATED) != 0) != activated) {
   15753             mPrivateFlags = (mPrivateFlags & ~PFLAG_ACTIVATED) | (activated ? PFLAG_ACTIVATED : 0);
   15754             invalidate(true);
   15755             refreshDrawableState();
   15756             dispatchSetActivated(activated);
   15757         }
   15758     }
   15759 
   15760     /**
   15761      * Dispatch setActivated to all of this View's children.
   15762      *
   15763      * @see #setActivated(boolean)
   15764      *
   15765      * @param activated The new activated state
   15766      */
   15767     protected void dispatchSetActivated(boolean activated) {
   15768     }
   15769 
   15770     /**
   15771      * Indicates the activation state of this view.
   15772      *
   15773      * @return true if the view is activated, false otherwise
   15774      */
   15775     @ViewDebug.ExportedProperty
   15776     public boolean isActivated() {
   15777         return (mPrivateFlags & PFLAG_ACTIVATED) != 0;
   15778     }
   15779 
   15780     /**
   15781      * Returns the ViewTreeObserver for this view's hierarchy. The view tree
   15782      * observer can be used to get notifications when global events, like
   15783      * layout, happen.
   15784      *
   15785      * The returned ViewTreeObserver observer is not guaranteed to remain
   15786      * valid for the lifetime of this View. If the caller of this method keeps
   15787      * a long-lived reference to ViewTreeObserver, it should always check for
   15788      * the return value of {@link ViewTreeObserver#isAlive()}.
   15789      *
   15790      * @return The ViewTreeObserver for this view's hierarchy.
   15791      */
   15792     public ViewTreeObserver getViewTreeObserver() {
   15793         if (mAttachInfo != null) {
   15794             return mAttachInfo.mTreeObserver;
   15795         }
   15796         if (mFloatingTreeObserver == null) {
   15797             mFloatingTreeObserver = new ViewTreeObserver();
   15798         }
   15799         return mFloatingTreeObserver;
   15800     }
   15801 
   15802     /**
   15803      * <p>Finds the topmost view in the current view hierarchy.</p>
   15804      *
   15805      * @return the topmost view containing this view
   15806      */
   15807     public View getRootView() {
   15808         if (mAttachInfo != null) {
   15809             final View v = mAttachInfo.mRootView;
   15810             if (v != null) {
   15811                 return v;
   15812             }
   15813         }
   15814 
   15815         View parent = this;
   15816 
   15817         while (parent.mParent != null && parent.mParent instanceof View) {
   15818             parent = (View) parent.mParent;
   15819         }
   15820 
   15821         return parent;
   15822     }
   15823 
   15824     /**
   15825      * Transforms a motion event from view-local coordinates to on-screen
   15826      * coordinates.
   15827      *
   15828      * @param ev the view-local motion event
   15829      * @return false if the transformation could not be applied
   15830      * @hide
   15831      */
   15832     public boolean toGlobalMotionEvent(MotionEvent ev) {
   15833         final AttachInfo info = mAttachInfo;
   15834         if (info == null) {
   15835             return false;
   15836         }
   15837 
   15838         transformMotionEventToGlobal(ev);
   15839         ev.offsetLocation(info.mWindowLeft, info.mWindowTop);
   15840         return true;
   15841     }
   15842 
   15843     /**
   15844      * Transforms a motion event from on-screen coordinates to view-local
   15845      * coordinates.
   15846      *
   15847      * @param ev the on-screen motion event
   15848      * @return false if the transformation could not be applied
   15849      * @hide
   15850      */
   15851     public boolean toLocalMotionEvent(MotionEvent ev) {
   15852         final AttachInfo info = mAttachInfo;
   15853         if (info == null) {
   15854             return false;
   15855         }
   15856 
   15857         ev.offsetLocation(-info.mWindowLeft, -info.mWindowTop);
   15858         transformMotionEventToLocal(ev);
   15859         return true;
   15860     }
   15861 
   15862     /**
   15863      * Recursive helper method that applies transformations in post-order.
   15864      *
   15865      * @param ev the on-screen motion event
   15866      */
   15867     private void transformMotionEventToLocal(MotionEvent ev) {
   15868         final ViewParent parent = mParent;
   15869         if (parent instanceof View) {
   15870             final View vp = (View) parent;
   15871             vp.transformMotionEventToLocal(ev);
   15872             ev.offsetLocation(vp.mScrollX, vp.mScrollY);
   15873         } else if (parent instanceof ViewRootImpl) {
   15874             final ViewRootImpl vr = (ViewRootImpl) parent;
   15875             ev.offsetLocation(0, vr.mCurScrollY);
   15876         }
   15877 
   15878         ev.offsetLocation(-mLeft, -mTop);
   15879 
   15880         if (!hasIdentityMatrix()) {
   15881             ev.transform(getInverseMatrix());
   15882         }
   15883     }
   15884 
   15885     /**
   15886      * Recursive helper method that applies transformations in pre-order.
   15887      *
   15888      * @param ev the on-screen motion event
   15889      */
   15890     private void transformMotionEventToGlobal(MotionEvent ev) {
   15891         if (!hasIdentityMatrix()) {
   15892             ev.transform(getMatrix());
   15893         }
   15894 
   15895         ev.offsetLocation(mLeft, mTop);
   15896 
   15897         final ViewParent parent = mParent;
   15898         if (parent instanceof View) {
   15899             final View vp = (View) parent;
   15900             ev.offsetLocation(-vp.mScrollX, -vp.mScrollY);
   15901             vp.transformMotionEventToGlobal(ev);
   15902         } else if (parent instanceof ViewRootImpl) {
   15903             final ViewRootImpl vr = (ViewRootImpl) parent;
   15904             ev.offsetLocation(0, -vr.mCurScrollY);
   15905         }
   15906     }
   15907 
   15908     /**
   15909      * <p>Computes the coordinates of this view on the screen. The argument
   15910      * must be an array of two integers. After the method returns, the array
   15911      * contains the x and y location in that order.</p>
   15912      *
   15913      * @param location an array of two integers in which to hold the coordinates
   15914      */
   15915     public void getLocationOnScreen(int[] location) {
   15916         getLocationInWindow(location);
   15917 
   15918         final AttachInfo info = mAttachInfo;
   15919         if (info != null) {
   15920             location[0] += info.mWindowLeft;
   15921             location[1] += info.mWindowTop;
   15922         }
   15923     }
   15924 
   15925     /**
   15926      * <p>Computes the coordinates of this view in its window. The argument
   15927      * must be an array of two integers. After the method returns, the array
   15928      * contains the x and y location in that order.</p>
   15929      *
   15930      * @param location an array of two integers in which to hold the coordinates
   15931      */
   15932     public void getLocationInWindow(int[] location) {
   15933         if (location == null || location.length < 2) {
   15934             throw new IllegalArgumentException("location must be an array of two integers");
   15935         }
   15936 
   15937         if (mAttachInfo == null) {
   15938             // When the view is not attached to a window, this method does not make sense
   15939             location[0] = location[1] = 0;
   15940             return;
   15941         }
   15942 
   15943         float[] position = mAttachInfo.mTmpTransformLocation;
   15944         position[0] = position[1] = 0.0f;
   15945 
   15946         if (!hasIdentityMatrix()) {
   15947             getMatrix().mapPoints(position);
   15948         }
   15949 
   15950         position[0] += mLeft;
   15951         position[1] += mTop;
   15952 
   15953         ViewParent viewParent = mParent;
   15954         while (viewParent instanceof View) {
   15955             final View view = (View) viewParent;
   15956 
   15957             position[0] -= view.mScrollX;
   15958             position[1] -= view.mScrollY;
   15959 
   15960             if (!view.hasIdentityMatrix()) {
   15961                 view.getMatrix().mapPoints(position);
   15962             }
   15963 
   15964             position[0] += view.mLeft;
   15965             position[1] += view.mTop;
   15966 
   15967             viewParent = view.mParent;
   15968          }
   15969 
   15970         if (viewParent instanceof ViewRootImpl) {
   15971             // *cough*
   15972             final ViewRootImpl vr = (ViewRootImpl) viewParent;
   15973             position[1] -= vr.mCurScrollY;
   15974         }
   15975 
   15976         location[0] = (int) (position[0] + 0.5f);
   15977         location[1] = (int) (position[1] + 0.5f);
   15978     }
   15979 
   15980     /**
   15981      * {@hide}
   15982      * @param id the id of the view to be found
   15983      * @return the view of the specified id, null if cannot be found
   15984      */
   15985     protected View findViewTraversal(int id) {
   15986         if (id == mID) {
   15987             return this;
   15988         }
   15989         return null;
   15990     }
   15991 
   15992     /**
   15993      * {@hide}
   15994      * @param tag the tag of the view to be found
   15995      * @return the view of specified tag, null if cannot be found
   15996      */
   15997     protected View findViewWithTagTraversal(Object tag) {
   15998         if (tag != null && tag.equals(mTag)) {
   15999             return this;
   16000         }
   16001         return null;
   16002     }
   16003 
   16004     /**
   16005      * {@hide}
   16006      * @param predicate The predicate to evaluate.
   16007      * @param childToSkip If not null, ignores this child during the recursive traversal.
   16008      * @return The first view that matches the predicate or null.
   16009      */
   16010     protected View findViewByPredicateTraversal(Predicate<View> predicate, View childToSkip) {
   16011         if (predicate.apply(this)) {
   16012             return this;
   16013         }
   16014         return null;
   16015     }
   16016 
   16017     /**
   16018      * Look for a child view with the given id.  If this view has the given
   16019      * id, return this view.
   16020      *
   16021      * @param id The id to search for.
   16022      * @return The view that has the given id in the hierarchy or null
   16023      */
   16024     public final View findViewById(int id) {
   16025         if (id < 0) {
   16026             return null;
   16027         }
   16028         return findViewTraversal(id);
   16029     }
   16030 
   16031     /**
   16032      * Finds a view by its unuque and stable accessibility id.
   16033      *
   16034      * @param accessibilityId The searched accessibility id.
   16035      * @return The found view.
   16036      */
   16037     final View findViewByAccessibilityId(int accessibilityId) {
   16038         if (accessibilityId < 0) {
   16039             return null;
   16040         }
   16041         return findViewByAccessibilityIdTraversal(accessibilityId);
   16042     }
   16043 
   16044     /**
   16045      * Performs the traversal to find a view by its unuque and stable accessibility id.
   16046      *
   16047      * <strong>Note:</strong>This method does not stop at the root namespace
   16048      * boundary since the user can touch the screen at an arbitrary location
   16049      * potentially crossing the root namespace bounday which will send an
   16050      * accessibility event to accessibility services and they should be able
   16051      * to obtain the event source. Also accessibility ids are guaranteed to be
   16052      * unique in the window.
   16053      *
   16054      * @param accessibilityId The accessibility id.
   16055      * @return The found view.
   16056      *
   16057      * @hide
   16058      */
   16059     public View findViewByAccessibilityIdTraversal(int accessibilityId) {
   16060         if (getAccessibilityViewId() == accessibilityId) {
   16061             return this;
   16062         }
   16063         return null;
   16064     }
   16065 
   16066     /**
   16067      * Look for a child view with the given tag.  If this view has the given
   16068      * tag, return this view.
   16069      *
   16070      * @param tag The tag to search for, using "tag.equals(getTag())".
   16071      * @return The View that has the given tag in the hierarchy or null
   16072      */
   16073     public final View findViewWithTag(Object tag) {
   16074         if (tag == null) {
   16075             return null;
   16076         }
   16077         return findViewWithTagTraversal(tag);
   16078     }
   16079 
   16080     /**
   16081      * {@hide}
   16082      * Look for a child view that matches the specified predicate.
   16083      * If this view matches the predicate, return this view.
   16084      *
   16085      * @param predicate The predicate to evaluate.
   16086      * @return The first view that matches the predicate or null.
   16087      */
   16088     public final View findViewByPredicate(Predicate<View> predicate) {
   16089         return findViewByPredicateTraversal(predicate, null);
   16090     }
   16091 
   16092     /**
   16093      * {@hide}
   16094      * Look for a child view that matches the specified predicate,
   16095      * starting with the specified view and its descendents and then
   16096      * recusively searching the ancestors and siblings of that view
   16097      * until this view is reached.
   16098      *
   16099      * This method is useful in cases where the predicate does not match
   16100      * a single unique view (perhaps multiple views use the same id)
   16101      * and we are trying to find the view that is "closest" in scope to the
   16102      * starting view.
   16103      *
   16104      * @param start The view to start from.
   16105      * @param predicate The predicate to evaluate.
   16106      * @return The first view that matches the predicate or null.
   16107      */
   16108     public final View findViewByPredicateInsideOut(View start, Predicate<View> predicate) {
   16109         View childToSkip = null;
   16110         for (;;) {
   16111             View view = start.findViewByPredicateTraversal(predicate, childToSkip);
   16112             if (view != null || start == this) {
   16113                 return view;
   16114             }
   16115 
   16116             ViewParent parent = start.getParent();
   16117             if (parent == null || !(parent instanceof View)) {
   16118                 return null;
   16119             }
   16120 
   16121             childToSkip = start;
   16122             start = (View) parent;
   16123         }
   16124     }
   16125 
   16126     /**
   16127      * Sets the identifier for this view. The identifier does not have to be
   16128      * unique in this view's hierarchy. The identifier should be a positive
   16129      * number.
   16130      *
   16131      * @see #NO_ID
   16132      * @see #getId()
   16133      * @see #findViewById(int)
   16134      *
   16135      * @param id a number used to identify the view
   16136      *
   16137      * @attr ref android.R.styleable#View_id
   16138      */
   16139     public void setId(int id) {
   16140         mID = id;
   16141         if (mID == View.NO_ID && mLabelForId != View.NO_ID) {
   16142             mID = generateViewId();
   16143         }
   16144     }
   16145 
   16146     /**
   16147      * {@hide}
   16148      *
   16149      * @param isRoot true if the view belongs to the root namespace, false
   16150      *        otherwise
   16151      */
   16152     public void setIsRootNamespace(boolean isRoot) {
   16153         if (isRoot) {
   16154             mPrivateFlags |= PFLAG_IS_ROOT_NAMESPACE;
   16155         } else {
   16156             mPrivateFlags &= ~PFLAG_IS_ROOT_NAMESPACE;
   16157         }
   16158     }
   16159 
   16160     /**
   16161      * {@hide}
   16162      *
   16163      * @return true if the view belongs to the root namespace, false otherwise
   16164      */
   16165     public boolean isRootNamespace() {
   16166         return (mPrivateFlags&PFLAG_IS_ROOT_NAMESPACE) != 0;
   16167     }
   16168 
   16169     /**
   16170      * Returns this view's identifier.
   16171      *
   16172      * @return a positive integer used to identify the view or {@link #NO_ID}
   16173      *         if the view has no ID
   16174      *
   16175      * @see #setId(int)
   16176      * @see #findViewById(int)
   16177      * @attr ref android.R.styleable#View_id
   16178      */
   16179     @ViewDebug.CapturedViewProperty
   16180     public int getId() {
   16181         return mID;
   16182     }
   16183 
   16184     /**
   16185      * Returns this view's tag.
   16186      *
   16187      * @return the Object stored in this view as a tag
   16188      *
   16189      * @see #setTag(Object)
   16190      * @see #getTag(int)
   16191      */
   16192     @ViewDebug.ExportedProperty
   16193     public Object getTag() {
   16194         return mTag;
   16195     }
   16196 
   16197     /**
   16198      * Sets the tag associated with this view. A tag can be used to mark
   16199      * a view in its hierarchy and does not have to be unique within the
   16200      * hierarchy. Tags can also be used to store data within a view without
   16201      * resorting to another data structure.
   16202      *
   16203      * @param tag an Object to tag the view with
   16204      *
   16205      * @see #getTag()
   16206      * @see #setTag(int, Object)
   16207      */
   16208     public void setTag(final Object tag) {
   16209         mTag = tag;
   16210     }
   16211 
   16212     /**
   16213      * Returns the tag associated with this view and the specified key.
   16214      *
   16215      * @param key The key identifying the tag
   16216      *
   16217      * @return the Object stored in this view as a tag
   16218      *
   16219      * @see #setTag(int, Object)
   16220      * @see #getTag()
   16221      */
   16222     public Object getTag(int key) {
   16223         if (mKeyedTags != null) return mKeyedTags.get(key);
   16224         return null;
   16225     }
   16226 
   16227     /**
   16228      * Sets a tag associated with this view and a key. A tag can be used
   16229      * to mark a view in its hierarchy and does not have to be unique within
   16230      * the hierarchy. Tags can also be used to store data within a view
   16231      * without resorting to another data structure.
   16232      *
   16233      * The specified key should be an id declared in the resources of the
   16234      * application to ensure it is unique (see the <a
   16235      * href={@docRoot}guide/topics/resources/more-resources.html#Id">ID resource type</a>).
   16236      * Keys identified as belonging to
   16237      * the Android framework or not associated with any package will cause
   16238      * an {@link IllegalArgumentException} to be thrown.
   16239      *
   16240      * @param key The key identifying the tag
   16241      * @param tag An Object to tag the view with
   16242      *
   16243      * @throws IllegalArgumentException If they specified key is not valid
   16244      *
   16245      * @see #setTag(Object)
   16246      * @see #getTag(int)
   16247      */
   16248     public void setTag(int key, final Object tag) {
   16249         // If the package id is 0x00 or 0x01, it's either an undefined package
   16250         // or a framework id
   16251         if ((key >>> 24) < 2) {
   16252             throw new IllegalArgumentException("The key must be an application-specific "
   16253                     + "resource id.");
   16254         }
   16255 
   16256         setKeyedTag(key, tag);
   16257     }
   16258 
   16259     /**
   16260      * Variation of {@link #setTag(int, Object)} that enforces the key to be a
   16261      * framework id.
   16262      *
   16263      * @hide
   16264      */
   16265     public void setTagInternal(int key, Object tag) {
   16266         if ((key >>> 24) != 0x1) {
   16267             throw new IllegalArgumentException("The key must be a framework-specific "
   16268                     + "resource id.");
   16269         }
   16270 
   16271         setKeyedTag(key, tag);
   16272     }
   16273 
   16274     private void setKeyedTag(int key, Object tag) {
   16275         if (mKeyedTags == null) {
   16276             mKeyedTags = new SparseArray<Object>(2);
   16277         }
   16278 
   16279         mKeyedTags.put(key, tag);
   16280     }
   16281 
   16282     /**
   16283      * Prints information about this view in the log output, with the tag
   16284      * {@link #VIEW_LOG_TAG}.
   16285      *
   16286      * @hide
   16287      */
   16288     public void debug() {
   16289         debug(0);
   16290     }
   16291 
   16292     /**
   16293      * Prints information about this view in the log output, with the tag
   16294      * {@link #VIEW_LOG_TAG}. Each line in the output is preceded with an
   16295      * indentation defined by the <code>depth</code>.
   16296      *
   16297      * @param depth the indentation level
   16298      *
   16299      * @hide
   16300      */
   16301     protected void debug(int depth) {
   16302         String output = debugIndent(depth - 1);
   16303 
   16304         output += "+ " + this;
   16305         int id = getId();
   16306         if (id != -1) {
   16307             output += " (id=" + id + ")";
   16308         }
   16309         Object tag = getTag();
   16310         if (tag != null) {
   16311             output += " (tag=" + tag + ")";
   16312         }
   16313         Log.d(VIEW_LOG_TAG, output);
   16314 
   16315         if ((mPrivateFlags & PFLAG_FOCUSED) != 0) {
   16316             output = debugIndent(depth) + " FOCUSED";
   16317             Log.d(VIEW_LOG_TAG, output);
   16318         }
   16319 
   16320         output = debugIndent(depth);
   16321         output += "frame={" + mLeft + ", " + mTop + ", " + mRight
   16322                 + ", " + mBottom + "} scroll={" + mScrollX + ", " + mScrollY
   16323                 + "} ";
   16324         Log.d(VIEW_LOG_TAG, output);
   16325 
   16326         if (mPaddingLeft != 0 || mPaddingTop != 0 || mPaddingRight != 0
   16327                 || mPaddingBottom != 0) {
   16328             output = debugIndent(depth);
   16329             output += "padding={" + mPaddingLeft + ", " + mPaddingTop
   16330                     + ", " + mPaddingRight + ", " + mPaddingBottom + "}";
   16331             Log.d(VIEW_LOG_TAG, output);
   16332         }
   16333 
   16334         output = debugIndent(depth);
   16335         output += "mMeasureWidth=" + mMeasuredWidth +
   16336                 " mMeasureHeight=" + mMeasuredHeight;
   16337         Log.d(VIEW_LOG_TAG, output);
   16338 
   16339         output = debugIndent(depth);
   16340         if (mLayoutParams == null) {
   16341             output += "BAD! no layout params";
   16342         } else {
   16343             output = mLayoutParams.debug(output);
   16344         }
   16345         Log.d(VIEW_LOG_TAG, output);
   16346 
   16347         output = debugIndent(depth);
   16348         output += "flags={";
   16349         output += View.printFlags(mViewFlags);
   16350         output += "}";
   16351         Log.d(VIEW_LOG_TAG, output);
   16352 
   16353         output = debugIndent(depth);
   16354         output += "privateFlags={";
   16355         output += View.printPrivateFlags(mPrivateFlags);
   16356         output += "}";
   16357         Log.d(VIEW_LOG_TAG, output);
   16358     }
   16359 
   16360     /**
   16361      * Creates a string of whitespaces used for indentation.
   16362      *
   16363      * @param depth the indentation level
   16364      * @return a String containing (depth * 2 + 3) * 2 white spaces
   16365      *
   16366      * @hide
   16367      */
   16368     protected static String debugIndent(int depth) {
   16369         StringBuilder spaces = new StringBuilder((depth * 2 + 3) * 2);
   16370         for (int i = 0; i < (depth * 2) + 3; i++) {
   16371             spaces.append(' ').append(' ');
   16372         }
   16373         return spaces.toString();
   16374     }
   16375 
   16376     /**
   16377      * <p>Return the offset of the widget's text baseline from the widget's top
   16378      * boundary. If this widget does not support baseline alignment, this
   16379      * method returns -1. </p>
   16380      *
   16381      * @return the offset of the baseline within the widget's bounds or -1
   16382      *         if baseline alignment is not supported
   16383      */
   16384     @ViewDebug.ExportedProperty(category = "layout")
   16385     public int getBaseline() {
   16386         return -1;
   16387     }
   16388 
   16389     /**
   16390      * Returns whether the view hierarchy is currently undergoing a layout pass. This
   16391      * information is useful to avoid situations such as calling {@link #requestLayout()} during
   16392      * a layout pass.
   16393      *
   16394      * @return whether the view hierarchy is currently undergoing a layout pass
   16395      */
   16396     public boolean isInLayout() {
   16397         ViewRootImpl viewRoot = getViewRootImpl();
   16398         return (viewRoot != null && viewRoot.isInLayout());
   16399     }
   16400 
   16401     /**
   16402      * Call this when something has changed which has invalidated the
   16403      * layout of this view. This will schedule a layout pass of the view
   16404      * tree. This should not be called while the view hierarchy is currently in a layout
   16405      * pass ({@link #isInLayout()}. If layout is happening, the request may be honored at the
   16406      * end of the current layout pass (and then layout will run again) or after the current
   16407      * frame is drawn and the next layout occurs.
   16408      *
   16409      * <p>Subclasses which override this method should call the superclass method to
   16410      * handle possible request-during-layout errors correctly.</p>
   16411      */
   16412     public void requestLayout() {
   16413         if (mMeasureCache != null) mMeasureCache.clear();
   16414 
   16415         if (mAttachInfo != null && mAttachInfo.mViewRequestingLayout == null) {
   16416             // Only trigger request-during-layout logic if this is the view requesting it,
   16417             // not the views in its parent hierarchy
   16418             ViewRootImpl viewRoot = getViewRootImpl();
   16419             if (viewRoot != null && viewRoot.isInLayout()) {
   16420                 if (!viewRoot.requestLayoutDuringLayout(this)) {
   16421                     return;
   16422                 }
   16423             }
   16424             mAttachInfo.mViewRequestingLayout = this;
   16425         }
   16426 
   16427         mPrivateFlags |= PFLAG_FORCE_LAYOUT;
   16428         mPrivateFlags |= PFLAG_INVALIDATED;
   16429 
   16430         if (mParent != null && !mParent.isLayoutRequested()) {
   16431             mParent.requestLayout();
   16432         }
   16433         if (mAttachInfo != null && mAttachInfo.mViewRequestingLayout == this) {
   16434             mAttachInfo.mViewRequestingLayout = null;
   16435         }
   16436     }
   16437 
   16438     /**
   16439      * Forces this view to be laid out during the next layout pass.
   16440      * This method does not call requestLayout() or forceLayout()
   16441      * on the parent.
   16442      */
   16443     public void forceLayout() {
   16444         if (mMeasureCache != null) mMeasureCache.clear();
   16445 
   16446         mPrivateFlags |= PFLAG_FORCE_LAYOUT;
   16447         mPrivateFlags |= PFLAG_INVALIDATED;
   16448     }
   16449 
   16450     /**
   16451      * <p>
   16452      * This is called to find out how big a view should be. The parent
   16453      * supplies constraint information in the width and height parameters.
   16454      * </p>
   16455      *
   16456      * <p>
   16457      * The actual measurement work of a view is performed in
   16458      * {@link #onMeasure(int, int)}, called by this method. Therefore, only
   16459      * {@link #onMeasure(int, int)} can and must be overridden by subclasses.
   16460      * </p>
   16461      *
   16462      *
   16463      * @param widthMeasureSpec Horizontal space requirements as imposed by the
   16464      *        parent
   16465      * @param heightMeasureSpec Vertical space requirements as imposed by the
   16466      *        parent
   16467      *
   16468      * @see #onMeasure(int, int)
   16469      */
   16470     public final void measure(int widthMeasureSpec, int heightMeasureSpec) {
   16471         boolean optical = isLayoutModeOptical(this);
   16472         if (optical != isLayoutModeOptical(mParent)) {
   16473             Insets insets = getOpticalInsets();
   16474             int oWidth  = insets.left + insets.right;
   16475             int oHeight = insets.top  + insets.bottom;
   16476             widthMeasureSpec  = MeasureSpec.adjust(widthMeasureSpec,  optical ? -oWidth  : oWidth);
   16477             heightMeasureSpec = MeasureSpec.adjust(heightMeasureSpec, optical ? -oHeight : oHeight);
   16478         }
   16479 
   16480         // Suppress sign extension for the low bytes
   16481         long key = (long) widthMeasureSpec << 32 | (long) heightMeasureSpec & 0xffffffffL;
   16482         if (mMeasureCache == null) mMeasureCache = new LongSparseLongArray(2);
   16483 
   16484         if ((mPrivateFlags & PFLAG_FORCE_LAYOUT) == PFLAG_FORCE_LAYOUT ||
   16485                 widthMeasureSpec != mOldWidthMeasureSpec ||
   16486                 heightMeasureSpec != mOldHeightMeasureSpec) {
   16487 
   16488             // first clears the measured dimension flag
   16489             mPrivateFlags &= ~PFLAG_MEASURED_DIMENSION_SET;
   16490 
   16491             resolveRtlPropertiesIfNeeded();
   16492 
   16493             int cacheIndex = (mPrivateFlags & PFLAG_FORCE_LAYOUT) == PFLAG_FORCE_LAYOUT ? -1 :
   16494                     mMeasureCache.indexOfKey(key);
   16495             if (cacheIndex < 0 || sIgnoreMeasureCache) {
   16496                 // measure ourselves, this should set the measured dimension flag back
   16497                 onMeasure(widthMeasureSpec, heightMeasureSpec);
   16498                 mPrivateFlags3 &= ~PFLAG3_MEASURE_NEEDED_BEFORE_LAYOUT;
   16499             } else {
   16500                 long value = mMeasureCache.valueAt(cacheIndex);
   16501                 // Casting a long to int drops the high 32 bits, no mask needed
   16502                 setMeasuredDimension((int) (value >> 32), (int) value);
   16503                 mPrivateFlags3 |= PFLAG3_MEASURE_NEEDED_BEFORE_LAYOUT;
   16504             }
   16505 
   16506             // flag not set, setMeasuredDimension() was not invoked, we raise
   16507             // an exception to warn the developer
   16508             if ((mPrivateFlags & PFLAG_MEASURED_DIMENSION_SET) != PFLAG_MEASURED_DIMENSION_SET) {
   16509                 throw new IllegalStateException("onMeasure() did not set the"
   16510                         + " measured dimension by calling"
   16511                         + " setMeasuredDimension()");
   16512             }
   16513 
   16514             mPrivateFlags |= PFLAG_LAYOUT_REQUIRED;
   16515         }
   16516 
   16517         mOldWidthMeasureSpec = widthMeasureSpec;
   16518         mOldHeightMeasureSpec = heightMeasureSpec;
   16519 
   16520         mMeasureCache.put(key, ((long) mMeasuredWidth) << 32 |
   16521                 (long) mMeasuredHeight & 0xffffffffL); // suppress sign extension
   16522     }
   16523 
   16524     /**
   16525      * <p>
   16526      * Measure the view and its content to determine the measured width and the
   16527      * measured height. This method is invoked by {@link #measure(int, int)} and
   16528      * should be overriden by subclasses to provide accurate and efficient
   16529      * measurement of their contents.
   16530      * </p>
   16531      *
   16532      * <p>
   16533      * <strong>CONTRACT:</strong> When overriding this method, you
   16534      * <em>must</em> call {@link #setMeasuredDimension(int, int)} to store the
   16535      * measured width and height of this view. Failure to do so will trigger an
   16536      * <code>IllegalStateException</code>, thrown by
   16537      * {@link #measure(int, int)}. Calling the superclass'
   16538      * {@link #onMeasure(int, int)} is a valid use.
   16539      * </p>
   16540      *
   16541      * <p>
   16542      * The base class implementation of measure defaults to the background size,
   16543      * unless a larger size is allowed by the MeasureSpec. Subclasses should
   16544      * override {@link #onMeasure(int, int)} to provide better measurements of
   16545      * their content.
   16546      * </p>
   16547      *
   16548      * <p>
   16549      * If this method is overridden, it is the subclass's responsibility to make
   16550      * sure the measured height and width are at least the view's minimum height
   16551      * and width ({@link #getSuggestedMinimumHeight()} and
   16552      * {@link #getSuggestedMinimumWidth()}).
   16553      * </p>
   16554      *
   16555      * @param widthMeasureSpec horizontal space requirements as imposed by the parent.
   16556      *                         The requirements are encoded with
   16557      *                         {@link android.view.View.MeasureSpec}.
   16558      * @param heightMeasureSpec vertical space requirements as imposed by the parent.
   16559      *                         The requirements are encoded with
   16560      *                         {@link android.view.View.MeasureSpec}.
   16561      *
   16562      * @see #getMeasuredWidth()
   16563      * @see #getMeasuredHeight()
   16564      * @see #setMeasuredDimension(int, int)
   16565      * @see #getSuggestedMinimumHeight()
   16566      * @see #getSuggestedMinimumWidth()
   16567      * @see android.view.View.MeasureSpec#getMode(int)
   16568      * @see android.view.View.MeasureSpec#getSize(int)
   16569      */
   16570     protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
   16571         setMeasuredDimension(getDefaultSize(getSuggestedMinimumWidth(), widthMeasureSpec),
   16572                 getDefaultSize(getSuggestedMinimumHeight(), heightMeasureSpec));
   16573     }
   16574 
   16575     /**
   16576      * <p>This method must be called by {@link #onMeasure(int, int)} to store the
   16577      * measured width and measured height. Failing to do so will trigger an
   16578      * exception at measurement time.</p>
   16579      *
   16580      * @param measuredWidth The measured width of this view.  May be a complex
   16581      * bit mask as defined by {@link #MEASURED_SIZE_MASK} and
   16582      * {@link #MEASURED_STATE_TOO_SMALL}.
   16583      * @param measuredHeight The measured height of this view.  May be a complex
   16584      * bit mask as defined by {@link #MEASURED_SIZE_MASK} and
   16585      * {@link #MEASURED_STATE_TOO_SMALL}.
   16586      */
   16587     protected final void setMeasuredDimension(int measuredWidth, int measuredHeight) {
   16588         boolean optical = isLayoutModeOptical(this);
   16589         if (optical != isLayoutModeOptical(mParent)) {
   16590             Insets insets = getOpticalInsets();
   16591             int opticalWidth  = insets.left + insets.right;
   16592             int opticalHeight = insets.top  + insets.bottom;
   16593 
   16594             measuredWidth  += optical ? opticalWidth  : -opticalWidth;
   16595             measuredHeight += optical ? opticalHeight : -opticalHeight;
   16596         }
   16597         mMeasuredWidth = measuredWidth;
   16598         mMeasuredHeight = measuredHeight;
   16599 
   16600         mPrivateFlags |= PFLAG_MEASURED_DIMENSION_SET;
   16601     }
   16602 
   16603     /**
   16604      * Merge two states as returned by {@link #getMeasuredState()}.
   16605      * @param curState The current state as returned from a view or the result
   16606      * of combining multiple views.
   16607      * @param newState The new view state to combine.
   16608      * @return Returns a new integer reflecting the combination of the two
   16609      * states.
   16610      */
   16611     public static int combineMeasuredStates(int curState, int newState) {
   16612         return curState | newState;
   16613     }
   16614 
   16615     /**
   16616      * Version of {@link #resolveSizeAndState(int, int, int)}
   16617      * returning only the {@link #MEASURED_SIZE_MASK} bits of the result.
   16618      */
   16619     public static int resolveSize(int size, int measureSpec) {
   16620         return resolveSizeAndState(size, measureSpec, 0) & MEASURED_SIZE_MASK;
   16621     }
   16622 
   16623     /**
   16624      * Utility to reconcile a desired size and state, with constraints imposed
   16625      * by a MeasureSpec.  Will take the desired size, unless a different size
   16626      * is imposed by the constraints.  The returned value is a compound integer,
   16627      * with the resolved size in the {@link #MEASURED_SIZE_MASK} bits and
   16628      * optionally the bit {@link #MEASURED_STATE_TOO_SMALL} set if the resulting
   16629      * size is smaller than the size the view wants to be.
   16630      *
   16631      * @param size How big the view wants to be
   16632      * @param measureSpec Constraints imposed by the parent
   16633      * @return Size information bit mask as defined by
   16634      * {@link #MEASURED_SIZE_MASK} and {@link #MEASURED_STATE_TOO_SMALL}.
   16635      */
   16636     public static int resolveSizeAndState(int size, int measureSpec, int childMeasuredState) {
   16637         int result = size;
   16638         int specMode = MeasureSpec.getMode(measureSpec);
   16639         int specSize =  MeasureSpec.getSize(measureSpec);
   16640         switch (specMode) {
   16641         case MeasureSpec.UNSPECIFIED:
   16642             result = size;
   16643             break;
   16644         case MeasureSpec.AT_MOST:
   16645             if (specSize < size) {
   16646                 result = specSize | MEASURED_STATE_TOO_SMALL;
   16647             } else {
   16648                 result = size;
   16649             }
   16650             break;
   16651         case MeasureSpec.EXACTLY:
   16652             result = specSize;
   16653             break;
   16654         }
   16655         return result | (childMeasuredState&MEASURED_STATE_MASK);
   16656     }
   16657 
   16658     /**
   16659      * Utility to return a default size. Uses the supplied size if the
   16660      * MeasureSpec imposed no constraints. Will get larger if allowed
   16661      * by the MeasureSpec.
   16662      *
   16663      * @param size Default size for this view
   16664      * @param measureSpec Constraints imposed by the parent
   16665      * @return The size this view should be.
   16666      */
   16667     public static int getDefaultSize(int size, int measureSpec) {
   16668         int result = size;
   16669         int specMode = MeasureSpec.getMode(measureSpec);
   16670         int specSize = MeasureSpec.getSize(measureSpec);
   16671 
   16672         switch (specMode) {
   16673         case MeasureSpec.UNSPECIFIED:
   16674             result = size;
   16675             break;
   16676         case MeasureSpec.AT_MOST:
   16677         case MeasureSpec.EXACTLY:
   16678             result = specSize;
   16679             break;
   16680         }
   16681         return result;
   16682     }
   16683 
   16684     /**
   16685      * Returns the suggested minimum height that the view should use. This
   16686      * returns the maximum of the view's minimum height
   16687      * and the background's minimum height
   16688      * ({@link android.graphics.drawable.Drawable#getMinimumHeight()}).
   16689      * <p>
   16690      * When being used in {@link #onMeasure(int, int)}, the caller should still
   16691      * ensure the returned height is within the requirements of the parent.
   16692      *
   16693      * @return The suggested minimum height of the view.
   16694      */
   16695     protected int getSuggestedMinimumHeight() {
   16696         return (mBackground == null) ? mMinHeight : max(mMinHeight, mBackground.getMinimumHeight());
   16697 
   16698     }
   16699 
   16700     /**
   16701      * Returns the suggested minimum width that the view should use. This
   16702      * returns the maximum of the view's minimum width)
   16703      * and the background's minimum width
   16704      *  ({@link android.graphics.drawable.Drawable#getMinimumWidth()}).
   16705      * <p>
   16706      * When being used in {@link #onMeasure(int, int)}, the caller should still
   16707      * ensure the returned width is within the requirements of the parent.
   16708      *
   16709      * @return The suggested minimum width of the view.
   16710      */
   16711     protected int getSuggestedMinimumWidth() {
   16712         return (mBackground == null) ? mMinWidth : max(mMinWidth, mBackground.getMinimumWidth());
   16713     }
   16714 
   16715     /**
   16716      * Returns the minimum height of the view.
   16717      *
   16718      * @return the minimum height the view will try to be.
   16719      *
   16720      * @see #setMinimumHeight(int)
   16721      *
   16722      * @attr ref android.R.styleable#View_minHeight
   16723      */
   16724     public int getMinimumHeight() {
   16725         return mMinHeight;
   16726     }
   16727 
   16728     /**
   16729      * Sets the minimum height of the view. It is not guaranteed the view will
   16730      * be able to achieve this minimum height (for example, if its parent layout
   16731      * constrains it with less available height).
   16732      *
   16733      * @param minHeight The minimum height the view will try to be.
   16734      *
   16735      * @see #getMinimumHeight()
   16736      *
   16737      * @attr ref android.R.styleable#View_minHeight
   16738      */
   16739     public void setMinimumHeight(int minHeight) {
   16740         mMinHeight = minHeight;
   16741         requestLayout();
   16742     }
   16743 
   16744     /**
   16745      * Returns the minimum width of the view.
   16746      *
   16747      * @return the minimum width the view will try to be.
   16748      *
   16749      * @see #setMinimumWidth(int)
   16750      *
   16751      * @attr ref android.R.styleable#View_minWidth
   16752      */
   16753     public int getMinimumWidth() {
   16754         return mMinWidth;
   16755     }
   16756 
   16757     /**
   16758      * Sets the minimum width of the view. It is not guaranteed the view will
   16759      * be able to achieve this minimum width (for example, if its parent layout
   16760      * constrains it with less available width).
   16761      *
   16762      * @param minWidth The minimum width the view will try to be.
   16763      *
   16764      * @see #getMinimumWidth()
   16765      *
   16766      * @attr ref android.R.styleable#View_minWidth
   16767      */
   16768     public void setMinimumWidth(int minWidth) {
   16769         mMinWidth = minWidth;
   16770         requestLayout();
   16771 
   16772     }
   16773 
   16774     /**
   16775      * Get the animation currently associated with this view.
   16776      *
   16777      * @return The animation that is currently playing or
   16778      *         scheduled to play for this view.
   16779      */
   16780     public Animation getAnimation() {
   16781         return mCurrentAnimation;
   16782     }
   16783 
   16784     /**
   16785      * Start the specified animation now.
   16786      *
   16787      * @param animation the animation to start now
   16788      */
   16789     public void startAnimation(Animation animation) {
   16790         animation.setStartTime(Animation.START_ON_FIRST_FRAME);
   16791         setAnimation(animation);
   16792         invalidateParentCaches();
   16793         invalidate(true);
   16794     }
   16795 
   16796     /**
   16797      * Cancels any animations for this view.
   16798      */
   16799     public void clearAnimation() {
   16800         if (mCurrentAnimation != null) {
   16801             mCurrentAnimation.detach();
   16802         }
   16803         mCurrentAnimation = null;
   16804         invalidateParentIfNeeded();
   16805     }
   16806 
   16807     /**
   16808      * Sets the next animation to play for this view.
   16809      * If you want the animation to play immediately, use
   16810      * {@link #startAnimation(android.view.animation.Animation)} instead.
   16811      * This method provides allows fine-grained
   16812      * control over the start time and invalidation, but you
   16813      * must make sure that 1) the animation has a start time set, and
   16814      * 2) the view's parent (which controls animations on its children)
   16815      * will be invalidated when the animation is supposed to
   16816      * start.
   16817      *
   16818      * @param animation The next animation, or null.
   16819      */
   16820     public void setAnimation(Animation animation) {
   16821         mCurrentAnimation = animation;
   16822 
   16823         if (animation != null) {
   16824             // If the screen is off assume the animation start time is now instead of
   16825             // the next frame we draw. Keeping the START_ON_FIRST_FRAME start time
   16826             // would cause the animation to start when the screen turns back on
   16827             if (mAttachInfo != null && !mAttachInfo.mScreenOn &&
   16828                     animation.getStartTime() == Animation.START_ON_FIRST_FRAME) {
   16829                 animation.setStartTime(AnimationUtils.currentAnimationTimeMillis());
   16830             }
   16831             animation.reset();
   16832         }
   16833     }
   16834 
   16835     /**
   16836      * Invoked by a parent ViewGroup to notify the start of the animation
   16837      * currently associated with this view. If you override this method,
   16838      * always call super.onAnimationStart();
   16839      *
   16840      * @see #setAnimation(android.view.animation.Animation)
   16841      * @see #getAnimation()
   16842      */
   16843     protected void onAnimationStart() {
   16844         mPrivateFlags |= PFLAG_ANIMATION_STARTED;
   16845     }
   16846 
   16847     /**
   16848      * Invoked by a parent ViewGroup to notify the end of the animation
   16849      * currently associated with this view. If you override this method,
   16850      * always call super.onAnimationEnd();
   16851      *
   16852      * @see #setAnimation(android.view.animation.Animation)
   16853      * @see #getAnimation()
   16854      */
   16855     protected void onAnimationEnd() {
   16856         mPrivateFlags &= ~PFLAG_ANIMATION_STARTED;
   16857     }
   16858 
   16859     /**
   16860      * Invoked if there is a Transform that involves alpha. Subclass that can
   16861      * draw themselves with the specified alpha should return true, and then
   16862      * respect that alpha when their onDraw() is called. If this returns false
   16863      * then the view may be redirected to draw into an offscreen buffer to
   16864      * fulfill the request, which will look fine, but may be slower than if the
   16865      * subclass handles it internally. The default implementation returns false.
   16866      *
   16867      * @param alpha The alpha (0..255) to apply to the view's drawing
   16868      * @return true if the view can draw with the specified alpha.
   16869      */
   16870     protected boolean onSetAlpha(int alpha) {
   16871         return false;
   16872     }
   16873 
   16874     /**
   16875      * This is used by the RootView to perform an optimization when
   16876      * the view hierarchy contains one or several SurfaceView.
   16877      * SurfaceView is always considered transparent, but its children are not,
   16878      * therefore all View objects remove themselves from the global transparent
   16879      * region (passed as a parameter to this function).
   16880      *
   16881      * @param region The transparent region for this ViewAncestor (window).
   16882      *
   16883      * @return Returns true if the effective visibility of the view at this
   16884      * point is opaque, regardless of the transparent region; returns false
   16885      * if it is possible for underlying windows to be seen behind the view.
   16886      *
   16887      * {@hide}
   16888      */
   16889     public boolean gatherTransparentRegion(Region region) {
   16890         final AttachInfo attachInfo = mAttachInfo;
   16891         if (region != null && attachInfo != null) {
   16892             final int pflags = mPrivateFlags;
   16893             if ((pflags & PFLAG_SKIP_DRAW) == 0) {
   16894                 // The SKIP_DRAW flag IS NOT set, so this view draws. We need to
   16895                 // remove it from the transparent region.
   16896                 final int[] location = attachInfo.mTransparentLocation;
   16897                 getLocationInWindow(location);
   16898                 region.op(location[0], location[1], location[0] + mRight - mLeft,
   16899                         location[1] + mBottom - mTop, Region.Op.DIFFERENCE);
   16900             } else if ((pflags & PFLAG_ONLY_DRAWS_BACKGROUND) != 0 && mBackground != null) {
   16901                 // The ONLY_DRAWS_BACKGROUND flag IS set and the background drawable
   16902                 // exists, so we remove the background drawable's non-transparent
   16903                 // parts from this transparent region.
   16904                 applyDrawableToTransparentRegion(mBackground, region);
   16905             }
   16906         }
   16907         return true;
   16908     }
   16909 
   16910     /**
   16911      * Play a sound effect for this view.
   16912      *
   16913      * <p>The framework will play sound effects for some built in actions, such as
   16914      * clicking, but you may wish to play these effects in your widget,
   16915      * for instance, for internal navigation.
   16916      *
   16917      * <p>The sound effect will only be played if sound effects are enabled by the user, and
   16918      * {@link #isSoundEffectsEnabled()} is true.
   16919      *
   16920      * @param soundConstant One of the constants defined in {@link SoundEffectConstants}
   16921      */
   16922     public void playSoundEffect(int soundConstant) {
   16923         if (mAttachInfo == null || mAttachInfo.mRootCallbacks == null || !isSoundEffectsEnabled()) {
   16924             return;
   16925         }
   16926         mAttachInfo.mRootCallbacks.playSoundEffect(soundConstant);
   16927     }
   16928 
   16929     /**
   16930      * BZZZTT!!1!
   16931      *
   16932      * <p>Provide haptic feedback to the user for this view.
   16933      *
   16934      * <p>The framework will provide haptic feedback for some built in actions,
   16935      * such as long presses, but you may wish to provide feedback for your
   16936      * own widget.
   16937      *
   16938      * <p>The feedback will only be performed if
   16939      * {@link #isHapticFeedbackEnabled()} is true.
   16940      *
   16941      * @param feedbackConstant One of the constants defined in
   16942      * {@link HapticFeedbackConstants}
   16943      */
   16944     public boolean performHapticFeedback(int feedbackConstant) {
   16945         return performHapticFeedback(feedbackConstant, 0);
   16946     }
   16947 
   16948     /**
   16949      * BZZZTT!!1!
   16950      *
   16951      * <p>Like {@link #performHapticFeedback(int)}, with additional options.
   16952      *
   16953      * @param feedbackConstant One of the constants defined in
   16954      * {@link HapticFeedbackConstants}
   16955      * @param flags Additional flags as per {@link HapticFeedbackConstants}.
   16956      */
   16957     public boolean performHapticFeedback(int feedbackConstant, int flags) {
   16958         if (mAttachInfo == null) {
   16959             return false;
   16960         }
   16961         //noinspection SimplifiableIfStatement
   16962         if ((flags & HapticFeedbackConstants.FLAG_IGNORE_VIEW_SETTING) == 0
   16963                 && !isHapticFeedbackEnabled()) {
   16964             return false;
   16965         }
   16966         return mAttachInfo.mRootCallbacks.performHapticFeedback(feedbackConstant,
   16967                 (flags & HapticFeedbackConstants.FLAG_IGNORE_GLOBAL_SETTING) != 0);
   16968     }
   16969 
   16970     /**
   16971      * Request that the visibility of the status bar or other screen/window
   16972      * decorations be changed.
   16973      *
   16974      * <p>This method is used to put the over device UI into temporary modes
   16975      * where the user's attention is focused more on the application content,
   16976      * by dimming or hiding surrounding system affordances.  This is typically
   16977      * used in conjunction with {@link Window#FEATURE_ACTION_BAR_OVERLAY
   16978      * Window.FEATURE_ACTION_BAR_OVERLAY}, allowing the applications content
   16979      * to be placed behind the action bar (and with these flags other system
   16980      * affordances) so that smooth transitions between hiding and showing them
   16981      * can be done.
   16982      *
   16983      * <p>Two representative examples of the use of system UI visibility is
   16984      * implementing a content browsing application (like a magazine reader)
   16985      * and a video playing application.
   16986      *
   16987      * <p>The first code shows a typical implementation of a View in a content
   16988      * browsing application.  In this implementation, the application goes
   16989      * into a content-oriented mode by hiding the status bar and action bar,
   16990      * and putting the navigation elements into lights out mode.  The user can
   16991      * then interact with content while in this mode.  Such an application should
   16992      * provide an easy way for the user to toggle out of the mode (such as to
   16993      * check information in the status bar or access notifications).  In the
   16994      * implementation here, this is done simply by tapping on the content.
   16995      *
   16996      * {@sample development/samples/ApiDemos/src/com/example/android/apis/view/ContentBrowserActivity.java
   16997      *      content}
   16998      *
   16999      * <p>This second code sample shows a typical implementation of a View
   17000      * in a video playing application.  In this situation, while the video is
   17001      * playing the application would like to go into a complete full-screen mode,
   17002      * to use as much of the display as possible for the video.  When in this state
   17003      * the user can not interact with the application; the system intercepts
   17004      * touching on the screen to pop the UI out of full screen mode.  See
   17005      * {@link #fitSystemWindows(Rect)} for a sample layout that goes with this code.
   17006      *
   17007      * {@sample development/samples/ApiDemos/src/com/example/android/apis/view/VideoPlayerActivity.java
   17008      *      content}
   17009      *
   17010      * @param visibility  Bitwise-or of flags {@link #SYSTEM_UI_FLAG_LOW_PROFILE},
   17011      * {@link #SYSTEM_UI_FLAG_HIDE_NAVIGATION}, {@link #SYSTEM_UI_FLAG_FULLSCREEN},
   17012      * {@link #SYSTEM_UI_FLAG_LAYOUT_STABLE}, {@link #SYSTEM_UI_FLAG_LAYOUT_HIDE_NAVIGATION},
   17013      * {@link #SYSTEM_UI_FLAG_LAYOUT_FULLSCREEN}, {@link #SYSTEM_UI_FLAG_IMMERSIVE},
   17014      * and {@link #SYSTEM_UI_FLAG_IMMERSIVE_STICKY}.
   17015      */
   17016     public void setSystemUiVisibility(int visibility) {
   17017         if (visibility != mSystemUiVisibility) {
   17018             mSystemUiVisibility = visibility;
   17019             if (mParent != null && mAttachInfo != null && !mAttachInfo.mRecomputeGlobalAttributes) {
   17020                 mParent.recomputeViewAttributes(this);
   17021             }
   17022         }
   17023     }
   17024 
   17025     /**
   17026      * Returns the last {@link #setSystemUiVisibility(int)} that this view has requested.
   17027      * @return  Bitwise-or of flags {@link #SYSTEM_UI_FLAG_LOW_PROFILE},
   17028      * {@link #SYSTEM_UI_FLAG_HIDE_NAVIGATION}, {@link #SYSTEM_UI_FLAG_FULLSCREEN},
   17029      * {@link #SYSTEM_UI_FLAG_LAYOUT_STABLE}, {@link #SYSTEM_UI_FLAG_LAYOUT_HIDE_NAVIGATION},
   17030      * {@link #SYSTEM_UI_FLAG_LAYOUT_FULLSCREEN}, {@link #SYSTEM_UI_FLAG_IMMERSIVE},
   17031      * and {@link #SYSTEM_UI_FLAG_IMMERSIVE_STICKY}.
   17032      */
   17033     public int getSystemUiVisibility() {
   17034         return mSystemUiVisibility;
   17035     }
   17036 
   17037     /**
   17038      * Returns the current system UI visibility that is currently set for
   17039      * the entire window.  This is the combination of the
   17040      * {@link #setSystemUiVisibility(int)} values supplied by all of the
   17041      * views in the window.
   17042      */
   17043     public int getWindowSystemUiVisibility() {
   17044         return mAttachInfo != null ? mAttachInfo.mSystemUiVisibility : 0;
   17045     }
   17046 
   17047     /**
   17048      * Override to find out when the window's requested system UI visibility
   17049      * has changed, that is the value returned by {@link #getWindowSystemUiVisibility()}.
   17050      * This is different from the callbacks received through
   17051      * {@link #setOnSystemUiVisibilityChangeListener(OnSystemUiVisibilityChangeListener)}
   17052      * in that this is only telling you about the local request of the window,
   17053      * not the actual values applied by the system.
   17054      */
   17055     public void onWindowSystemUiVisibilityChanged(int visible) {
   17056     }
   17057 
   17058     /**
   17059      * Dispatch callbacks to {@link #onWindowSystemUiVisibilityChanged(int)} down
   17060      * the view hierarchy.
   17061      */
   17062     public void dispatchWindowSystemUiVisiblityChanged(int visible) {
   17063         onWindowSystemUiVisibilityChanged(visible);
   17064     }
   17065 
   17066     /**
   17067      * Set a listener to receive callbacks when the visibility of the system bar changes.
   17068      * @param l  The {@link OnSystemUiVisibilityChangeListener} to receive callbacks.
   17069      */
   17070     public void setOnSystemUiVisibilityChangeListener(OnSystemUiVisibilityChangeListener l) {
   17071         getListenerInfo().mOnSystemUiVisibilityChangeListener = l;
   17072         if (mParent != null && mAttachInfo != null && !mAttachInfo.mRecomputeGlobalAttributes) {
   17073             mParent.recomputeViewAttributes(this);
   17074         }
   17075     }
   17076 
   17077     /**
   17078      * Dispatch callbacks to {@link #setOnSystemUiVisibilityChangeListener} down
   17079      * the view hierarchy.
   17080      */
   17081     public void dispatchSystemUiVisibilityChanged(int visibility) {
   17082         ListenerInfo li = mListenerInfo;
   17083         if (li != null && li.mOnSystemUiVisibilityChangeListener != null) {
   17084             li.mOnSystemUiVisibilityChangeListener.onSystemUiVisibilityChange(
   17085                     visibility & PUBLIC_STATUS_BAR_VISIBILITY_MASK);
   17086         }
   17087     }
   17088 
   17089     boolean updateLocalSystemUiVisibility(int localValue, int localChanges) {
   17090         int val = (mSystemUiVisibility&~localChanges) | (localValue&localChanges);
   17091         if (val != mSystemUiVisibility) {
   17092             setSystemUiVisibility(val);
   17093             return true;
   17094         }
   17095         return false;
   17096     }
   17097 
   17098     /** @hide */
   17099     public void setDisabledSystemUiVisibility(int flags) {
   17100         if (mAttachInfo != null) {
   17101             if (mAttachInfo.mDisabledSystemUiVisibility != flags) {
   17102                 mAttachInfo.mDisabledSystemUiVisibility = flags;
   17103                 if (mParent != null) {
   17104                     mParent.recomputeViewAttributes(this);
   17105                 }
   17106             }
   17107         }
   17108     }
   17109 
   17110     /**
   17111      * Creates an image that the system displays during the drag and drop
   17112      * operation. This is called a &quot;drag shadow&quot;. The default implementation
   17113      * for a DragShadowBuilder based on a View returns an image that has exactly the same
   17114      * appearance as the given View. The default also positions the center of the drag shadow
   17115      * directly under the touch point. If no View is provided (the constructor with no parameters
   17116      * is used), and {@link #onProvideShadowMetrics(Point,Point) onProvideShadowMetrics()} and
   17117      * {@link #onDrawShadow(Canvas) onDrawShadow()} are not overriden, then the
   17118      * default is an invisible drag shadow.
   17119      * <p>
   17120      * You are not required to use the View you provide to the constructor as the basis of the
   17121      * drag shadow. The {@link #onDrawShadow(Canvas) onDrawShadow()} method allows you to draw
   17122      * anything you want as the drag shadow.
   17123      * </p>
   17124      * <p>
   17125      *  You pass a DragShadowBuilder object to the system when you start the drag. The system
   17126      *  calls {@link #onProvideShadowMetrics(Point,Point) onProvideShadowMetrics()} to get the
   17127      *  size and position of the drag shadow. It uses this data to construct a
   17128      *  {@link android.graphics.Canvas} object, then it calls {@link #onDrawShadow(Canvas) onDrawShadow()}
   17129      *  so that your application can draw the shadow image in the Canvas.
   17130      * </p>
   17131      *
   17132      * <div class="special reference">
   17133      * <h3>Developer Guides</h3>
   17134      * <p>For a guide to implementing drag and drop features, read the
   17135      * <a href="{@docRoot}guide/topics/ui/drag-drop.html">Drag and Drop</a> developer guide.</p>
   17136      * </div>
   17137      */
   17138     public static class DragShadowBuilder {
   17139         private final WeakReference<View> mView;
   17140 
   17141         /**
   17142          * Constructs a shadow image builder based on a View. By default, the resulting drag
   17143          * shadow will have the same appearance and dimensions as the View, with the touch point
   17144          * over the center of the View.
   17145          * @param view A View. Any View in scope can be used.
   17146          */
   17147         public DragShadowBuilder(View view) {
   17148             mView = new WeakReference<View>(view);
   17149         }
   17150 
   17151         /**
   17152          * Construct a shadow builder object with no associated View.  This
   17153          * constructor variant is only useful when the {@link #onProvideShadowMetrics(Point, Point)}
   17154          * and {@link #onDrawShadow(Canvas)} methods are also overridden in order
   17155          * to supply the drag shadow's dimensions and appearance without
   17156          * reference to any View object. If they are not overridden, then the result is an
   17157          * invisible drag shadow.
   17158          */
   17159         public DragShadowBuilder() {
   17160             mView = new WeakReference<View>(null);
   17161         }
   17162 
   17163         /**
   17164          * Returns the View object that had been passed to the
   17165          * {@link #View.DragShadowBuilder(View)}
   17166          * constructor.  If that View parameter was {@code null} or if the
   17167          * {@link #View.DragShadowBuilder()}
   17168          * constructor was used to instantiate the builder object, this method will return
   17169          * null.
   17170          *
   17171          * @return The View object associate with this builder object.
   17172          */
   17173         @SuppressWarnings({"JavadocReference"})
   17174         final public View getView() {
   17175             return mView.get();
   17176         }
   17177 
   17178         /**
   17179          * Provides the metrics for the shadow image. These include the dimensions of
   17180          * the shadow image, and the point within that shadow that should
   17181          * be centered under the touch location while dragging.
   17182          * <p>
   17183          * The default implementation sets the dimensions of the shadow to be the
   17184          * same as the dimensions of the View itself and centers the shadow under
   17185          * the touch point.
   17186          * </p>
   17187          *
   17188          * @param shadowSize A {@link android.graphics.Point} containing the width and height
   17189          * of the shadow image. Your application must set {@link android.graphics.Point#x} to the
   17190          * desired width and must set {@link android.graphics.Point#y} to the desired height of the
   17191          * image.
   17192          *
   17193          * @param shadowTouchPoint A {@link android.graphics.Point} for the position within the
   17194          * shadow image that should be underneath the touch point during the drag and drop
   17195          * operation. Your application must set {@link android.graphics.Point#x} to the
   17196          * X coordinate and {@link android.graphics.Point#y} to the Y coordinate of this position.
   17197          */
   17198         public void onProvideShadowMetrics(Point shadowSize, Point shadowTouchPoint) {
   17199             final View view = mView.get();
   17200             if (view != null) {
   17201                 shadowSize.set(view.getWidth(), view.getHeight());
   17202                 shadowTouchPoint.set(shadowSize.x / 2, shadowSize.y / 2);
   17203             } else {
   17204                 Log.e(View.VIEW_LOG_TAG, "Asked for drag thumb metrics but no view");
   17205             }
   17206         }
   17207 
   17208         /**
   17209          * Draws the shadow image. The system creates the {@link android.graphics.Canvas} object
   17210          * based on the dimensions it received from the
   17211          * {@link #onProvideShadowMetrics(Point, Point)} callback.
   17212          *
   17213          * @param canvas A {@link android.graphics.Canvas} object in which to draw the shadow image.
   17214          */
   17215         public void onDrawShadow(Canvas canvas) {
   17216             final View view = mView.get();
   17217             if (view != null) {
   17218                 view.draw(canvas);
   17219             } else {
   17220                 Log.e(View.VIEW_LOG_TAG, "Asked to draw drag shadow but no view");
   17221             }
   17222         }
   17223     }
   17224 
   17225     /**
   17226      * Starts a drag and drop operation. When your application calls this method, it passes a
   17227      * {@link android.view.View.DragShadowBuilder} object to the system. The
   17228      * system calls this object's {@link DragShadowBuilder#onProvideShadowMetrics(Point, Point)}
   17229      * to get metrics for the drag shadow, and then calls the object's
   17230      * {@link DragShadowBuilder#onDrawShadow(Canvas)} to draw the drag shadow itself.
   17231      * <p>
   17232      *  Once the system has the drag shadow, it begins the drag and drop operation by sending
   17233      *  drag events to all the View objects in your application that are currently visible. It does
   17234      *  this either by calling the View object's drag listener (an implementation of
   17235      *  {@link android.view.View.OnDragListener#onDrag(View,DragEvent) onDrag()} or by calling the
   17236      *  View object's {@link android.view.View#onDragEvent(DragEvent) onDragEvent()} method.
   17237      *  Both are passed a {@link android.view.DragEvent} object that has a
   17238      *  {@link android.view.DragEvent#getAction()} value of
   17239      *  {@link android.view.DragEvent#ACTION_DRAG_STARTED}.
   17240      * </p>
   17241      * <p>
   17242      * Your application can invoke startDrag() on any attached View object. The View object does not
   17243      * need to be the one used in {@link android.view.View.DragShadowBuilder}, nor does it need to
   17244      * be related to the View the user selected for dragging.
   17245      * </p>
   17246      * @param data A {@link android.content.ClipData} object pointing to the data to be
   17247      * transferred by the drag and drop operation.
   17248      * @param shadowBuilder A {@link android.view.View.DragShadowBuilder} object for building the
   17249      * drag shadow.
   17250      * @param myLocalState An {@link java.lang.Object} containing local data about the drag and
   17251      * drop operation. This Object is put into every DragEvent object sent by the system during the
   17252      * current drag.
   17253      * <p>
   17254      * myLocalState is a lightweight mechanism for the sending information from the dragged View
   17255      * to the target Views. For example, it can contain flags that differentiate between a
   17256      * a copy operation and a move operation.
   17257      * </p>
   17258      * @param flags Flags that control the drag and drop operation. No flags are currently defined,
   17259      * so the parameter should be set to 0.
   17260      * @return {@code true} if the method completes successfully, or
   17261      * {@code false} if it fails anywhere. Returning {@code false} means the system was unable to
   17262      * do a drag, and so no drag operation is in progress.
   17263      */
   17264     public final boolean startDrag(ClipData data, DragShadowBuilder shadowBuilder,
   17265             Object myLocalState, int flags) {
   17266         if (ViewDebug.DEBUG_DRAG) {
   17267             Log.d(VIEW_LOG_TAG, "startDrag: data=" + data + " flags=" + flags);
   17268         }
   17269         boolean okay = false;
   17270 
   17271         Point shadowSize = new Point();
   17272         Point shadowTouchPoint = new Point();
   17273         shadowBuilder.onProvideShadowMetrics(shadowSize, shadowTouchPoint);
   17274 
   17275         if ((shadowSize.x < 0) || (shadowSize.y < 0) ||
   17276                 (shadowTouchPoint.x < 0) || (shadowTouchPoint.y < 0)) {
   17277             throw new IllegalStateException("Drag shadow dimensions must not be negative");
   17278         }
   17279 
   17280         if (ViewDebug.DEBUG_DRAG) {
   17281             Log.d(VIEW_LOG_TAG, "drag shadow: width=" + shadowSize.x + " height=" + shadowSize.y
   17282                     + " shadowX=" + shadowTouchPoint.x + " shadowY=" + shadowTouchPoint.y);
   17283         }
   17284         Surface surface = new Surface();
   17285         try {
   17286             IBinder token = mAttachInfo.mSession.prepareDrag(mAttachInfo.mWindow,
   17287                     flags, shadowSize.x, shadowSize.y, surface);
   17288             if (ViewDebug.DEBUG_DRAG) Log.d(VIEW_LOG_TAG, "prepareDrag returned token=" + token
   17289                     + " surface=" + surface);
   17290             if (token != null) {
   17291                 Canvas canvas = surface.lockCanvas(null);
   17292                 try {
   17293                     canvas.drawColor(0, PorterDuff.Mode.CLEAR);
   17294                     shadowBuilder.onDrawShadow(canvas);
   17295                 } finally {
   17296                     surface.unlockCanvasAndPost(canvas);
   17297                 }
   17298 
   17299                 final ViewRootImpl root = getViewRootImpl();
   17300 
   17301                 // Cache the local state object for delivery with DragEvents
   17302                 root.setLocalDragState(myLocalState);
   17303 
   17304                 // repurpose 'shadowSize' for the last touch point
   17305                 root.getLastTouchPoint(shadowSize);
   17306 
   17307                 okay = mAttachInfo.mSession.performDrag(mAttachInfo.mWindow, token,
   17308                         shadowSize.x, shadowSize.y,
   17309                         shadowTouchPoint.x, shadowTouchPoint.y, data);
   17310                 if (ViewDebug.DEBUG_DRAG) Log.d(VIEW_LOG_TAG, "performDrag returned " + okay);
   17311 
   17312                 // Off and running!  Release our local surface instance; the drag
   17313                 // shadow surface is now managed by the system process.
   17314                 surface.release();
   17315             }
   17316         } catch (Exception e) {
   17317             Log.e(VIEW_LOG_TAG, "Unable to initiate drag", e);
   17318             surface.destroy();
   17319         }
   17320 
   17321         return okay;
   17322     }
   17323 
   17324     /**
   17325      * Handles drag events sent by the system following a call to
   17326      * {@link android.view.View#startDrag(ClipData,DragShadowBuilder,Object,int) startDrag()}.
   17327      *<p>
   17328      * When the system calls this method, it passes a
   17329      * {@link android.view.DragEvent} object. A call to
   17330      * {@link android.view.DragEvent#getAction()} returns one of the action type constants defined
   17331      * in DragEvent. The method uses these to determine what is happening in the drag and drop
   17332      * operation.
   17333      * @param event The {@link android.view.DragEvent} sent by the system.
   17334      * The {@link android.view.DragEvent#getAction()} method returns an action type constant defined
   17335      * in DragEvent, indicating the type of drag event represented by this object.
   17336      * @return {@code true} if the method was successful, otherwise {@code false}.
   17337      * <p>
   17338      *  The method should return {@code true} in response to an action type of
   17339      *  {@link android.view.DragEvent#ACTION_DRAG_STARTED} to receive drag events for the current
   17340      *  operation.
   17341      * </p>
   17342      * <p>
   17343      *  The method should also return {@code true} in response to an action type of
   17344      *  {@link android.view.DragEvent#ACTION_DROP} if it consumed the drop, or
   17345      *  {@code false} if it didn't.
   17346      * </p>
   17347      */
   17348     public boolean onDragEvent(DragEvent event) {
   17349         return false;
   17350     }
   17351 
   17352     /**
   17353      * Detects if this View is enabled and has a drag event listener.
   17354      * If both are true, then it calls the drag event listener with the
   17355      * {@link android.view.DragEvent} it received. If the drag event listener returns
   17356      * {@code true}, then dispatchDragEvent() returns {@code true}.
   17357      * <p>
   17358      * For all other cases, the method calls the
   17359      * {@link android.view.View#onDragEvent(DragEvent) onDragEvent()} drag event handler
   17360      * method and returns its result.
   17361      * </p>
   17362      * <p>
   17363      * This ensures that a drag event is always consumed, even if the View does not have a drag
   17364      * event listener. However, if the View has a listener and the listener returns true, then
   17365      * onDragEvent() is not called.
   17366      * </p>
   17367      */
   17368     public boolean dispatchDragEvent(DragEvent event) {
   17369         ListenerInfo li = mListenerInfo;
   17370         //noinspection SimplifiableIfStatement
   17371         if (li != null && li.mOnDragListener != null && (mViewFlags & ENABLED_MASK) == ENABLED
   17372                 && li.mOnDragListener.onDrag(this, event)) {
   17373             return true;
   17374         }
   17375         return onDragEvent(event);
   17376     }
   17377 
   17378     boolean canAcceptDrag() {
   17379         return (mPrivateFlags2 & PFLAG2_DRAG_CAN_ACCEPT) != 0;
   17380     }
   17381 
   17382     /**
   17383      * This needs to be a better API (NOT ON VIEW) before it is exposed.  If
   17384      * it is ever exposed at all.
   17385      * @hide
   17386      */
   17387     public void onCloseSystemDialogs(String reason) {
   17388     }
   17389 
   17390     /**
   17391      * Given a Drawable whose bounds have been set to draw into this view,
   17392      * update a Region being computed for
   17393      * {@link #gatherTransparentRegion(android.graphics.Region)} so
   17394      * that any non-transparent parts of the Drawable are removed from the
   17395      * given transparent region.
   17396      *
   17397      * @param dr The Drawable whose transparency is to be applied to the region.
   17398      * @param region A Region holding the current transparency information,
   17399      * where any parts of the region that are set are considered to be
   17400      * transparent.  On return, this region will be modified to have the
   17401      * transparency information reduced by the corresponding parts of the
   17402      * Drawable that are not transparent.
   17403      * {@hide}
   17404      */
   17405     public void applyDrawableToTransparentRegion(Drawable dr, Region region) {
   17406         if (DBG) {
   17407             Log.i("View", "Getting transparent region for: " + this);
   17408         }
   17409         final Region r = dr.getTransparentRegion();
   17410         final Rect db = dr.getBounds();
   17411         final AttachInfo attachInfo = mAttachInfo;
   17412         if (r != null && attachInfo != null) {
   17413             final int w = getRight()-getLeft();
   17414             final int h = getBottom()-getTop();
   17415             if (db.left > 0) {
   17416                 //Log.i("VIEW", "Drawable left " + db.left + " > view 0");
   17417                 r.op(0, 0, db.left, h, Region.Op.UNION);
   17418             }
   17419             if (db.right < w) {
   17420                 //Log.i("VIEW", "Drawable right " + db.right + " < view " + w);
   17421                 r.op(db.right, 0, w, h, Region.Op.UNION);
   17422             }
   17423             if (db.top > 0) {
   17424                 //Log.i("VIEW", "Drawable top " + db.top + " > view 0");
   17425                 r.op(0, 0, w, db.top, Region.Op.UNION);
   17426             }
   17427             if (db.bottom < h) {
   17428                 //Log.i("VIEW", "Drawable bottom " + db.bottom + " < view " + h);
   17429                 r.op(0, db.bottom, w, h, Region.Op.UNION);
   17430             }
   17431             final int[] location = attachInfo.mTransparentLocation;
   17432             getLocationInWindow(location);
   17433             r.translate(location[0], location[1]);
   17434             region.op(r, Region.Op.INTERSECT);
   17435         } else {
   17436             region.op(db, Region.Op.DIFFERENCE);
   17437         }
   17438     }
   17439 
   17440     private void checkForLongClick(int delayOffset) {
   17441         if ((mViewFlags & LONG_CLICKABLE) == LONG_CLICKABLE) {
   17442             mHasPerformedLongPress = false;
   17443 
   17444             if (mPendingCheckForLongPress == null) {
   17445                 mPendingCheckForLongPress = new CheckForLongPress();
   17446             }
   17447             mPendingCheckForLongPress.rememberWindowAttachCount();
   17448             postDelayed(mPendingCheckForLongPress,
   17449                     ViewConfiguration.getLongPressTimeout() - delayOffset);
   17450         }
   17451     }
   17452 
   17453     /**
   17454      * Inflate a view from an XML resource.  This convenience method wraps the {@link
   17455      * LayoutInflater} class, which provides a full range of options for view inflation.
   17456      *
   17457      * @param context The Context object for your activity or application.
   17458      * @param resource The resource ID to inflate
   17459      * @param root A view group that will be the parent.  Used to properly inflate the
   17460      * layout_* parameters.
   17461      * @see LayoutInflater
   17462      */
   17463     public static View inflate(Context context, int resource, ViewGroup root) {
   17464         LayoutInflater factory = LayoutInflater.from(context);
   17465         return factory.inflate(resource, root);
   17466     }
   17467 
   17468     /**
   17469      * Scroll the view with standard behavior for scrolling beyond the normal
   17470      * content boundaries. Views that call this method should override
   17471      * {@link #onOverScrolled(int, int, boolean, boolean)} to respond to the
   17472      * results of an over-scroll operation.
   17473      *
   17474      * Views can use this method to handle any touch or fling-based scrolling.
   17475      *
   17476      * @param deltaX Change in X in pixels
   17477      * @param deltaY Change in Y in pixels
   17478      * @param scrollX Current X scroll value in pixels before applying deltaX
   17479      * @param scrollY Current Y scroll value in pixels before applying deltaY
   17480      * @param scrollRangeX Maximum content scroll range along the X axis
   17481      * @param scrollRangeY Maximum content scroll range along the Y axis
   17482      * @param maxOverScrollX Number of pixels to overscroll by in either direction
   17483      *          along the X axis.
   17484      * @param maxOverScrollY Number of pixels to overscroll by in either direction
   17485      *          along the Y axis.
   17486      * @param isTouchEvent true if this scroll operation is the result of a touch event.
   17487      * @return true if scrolling was clamped to an over-scroll boundary along either
   17488      *          axis, false otherwise.
   17489      */
   17490     @SuppressWarnings({"UnusedParameters"})
   17491     protected boolean overScrollBy(int deltaX, int deltaY,
   17492             int scrollX, int scrollY,
   17493             int scrollRangeX, int scrollRangeY,
   17494             int maxOverScrollX, int maxOverScrollY,
   17495             boolean isTouchEvent) {
   17496         final int overScrollMode = mOverScrollMode;
   17497         final boolean canScrollHorizontal =
   17498                 computeHorizontalScrollRange() > computeHorizontalScrollExtent();
   17499         final boolean canScrollVertical =
   17500                 computeVerticalScrollRange() > computeVerticalScrollExtent();
   17501         final boolean overScrollHorizontal = overScrollMode == OVER_SCROLL_ALWAYS ||
   17502                 (overScrollMode == OVER_SCROLL_IF_CONTENT_SCROLLS && canScrollHorizontal);
   17503         final boolean overScrollVertical = overScrollMode == OVER_SCROLL_ALWAYS ||
   17504                 (overScrollMode == OVER_SCROLL_IF_CONTENT_SCROLLS && canScrollVertical);
   17505 
   17506         int newScrollX = scrollX + deltaX;
   17507         if (!overScrollHorizontal) {
   17508             maxOverScrollX = 0;
   17509         }
   17510 
   17511         int newScrollY = scrollY + deltaY;
   17512         if (!overScrollVertical) {
   17513             maxOverScrollY = 0;
   17514         }
   17515 
   17516         // Clamp values if at the limits and record
   17517         final int left = -maxOverScrollX;
   17518         final int right = maxOverScrollX + scrollRangeX;
   17519         final int top = -maxOverScrollY;
   17520         final int bottom = maxOverScrollY + scrollRangeY;
   17521 
   17522         boolean clampedX = false;
   17523         if (newScrollX > right) {
   17524             newScrollX = right;
   17525             clampedX = true;
   17526         } else if (newScrollX < left) {
   17527             newScrollX = left;
   17528             clampedX = true;
   17529         }
   17530 
   17531         boolean clampedY = false;
   17532         if (newScrollY > bottom) {
   17533             newScrollY = bottom;
   17534             clampedY = true;
   17535         } else if (newScrollY < top) {
   17536             newScrollY = top;
   17537             clampedY = true;
   17538         }
   17539 
   17540         onOverScrolled(newScrollX, newScrollY, clampedX, clampedY);
   17541 
   17542         return clampedX || clampedY;
   17543     }
   17544 
   17545     /**
   17546      * Called by {@link #overScrollBy(int, int, int, int, int, int, int, int, boolean)} to
   17547      * respond to the results of an over-scroll operation.
   17548      *
   17549      * @param scrollX New X scroll value in pixels
   17550      * @param scrollY New Y scroll value in pixels
   17551      * @param clampedX True if scrollX was clamped to an over-scroll boundary
   17552      * @param clampedY True if scrollY was clamped to an over-scroll boundary
   17553      */
   17554     protected void onOverScrolled(int scrollX, int scrollY,
   17555             boolean clampedX, boolean clampedY) {
   17556         // Intentionally empty.
   17557     }
   17558 
   17559     /**
   17560      * Returns the over-scroll mode for this view. The result will be
   17561      * one of {@link #OVER_SCROLL_ALWAYS} (default), {@link #OVER_SCROLL_IF_CONTENT_SCROLLS}
   17562      * (allow over-scrolling only if the view content is larger than the container),
   17563      * or {@link #OVER_SCROLL_NEVER}.
   17564      *
   17565      * @return This view's over-scroll mode.
   17566      */
   17567     public int getOverScrollMode() {
   17568         return mOverScrollMode;
   17569     }
   17570 
   17571     /**
   17572      * Set the over-scroll mode for this view. Valid over-scroll modes are
   17573      * {@link #OVER_SCROLL_ALWAYS} (default), {@link #OVER_SCROLL_IF_CONTENT_SCROLLS}
   17574      * (allow over-scrolling only if the view content is larger than the container),
   17575      * or {@link #OVER_SCROLL_NEVER}.
   17576      *
   17577      * Setting the over-scroll mode of a view will have an effect only if the
   17578      * view is capable of scrolling.
   17579      *
   17580      * @param overScrollMode The new over-scroll mode for this view.
   17581      */
   17582     public void setOverScrollMode(int overScrollMode) {
   17583         if (overScrollMode != OVER_SCROLL_ALWAYS &&
   17584                 overScrollMode != OVER_SCROLL_IF_CONTENT_SCROLLS &&
   17585                 overScrollMode != OVER_SCROLL_NEVER) {
   17586             throw new IllegalArgumentException("Invalid overscroll mode " + overScrollMode);
   17587         }
   17588         mOverScrollMode = overScrollMode;
   17589     }
   17590 
   17591     /**
   17592      * Gets a scale factor that determines the distance the view should scroll
   17593      * vertically in response to {@link MotionEvent#ACTION_SCROLL}.
   17594      * @return The vertical scroll scale factor.
   17595      * @hide
   17596      */
   17597     protected float getVerticalScrollFactor() {
   17598         if (mVerticalScrollFactor == 0) {
   17599             TypedValue outValue = new TypedValue();
   17600             if (!mContext.getTheme().resolveAttribute(
   17601                     com.android.internal.R.attr.listPreferredItemHeight, outValue, true)) {
   17602                 throw new IllegalStateException(
   17603                         "Expected theme to define listPreferredItemHeight.");
   17604             }
   17605             mVerticalScrollFactor = outValue.getDimension(
   17606                     mContext.getResources().getDisplayMetrics());
   17607         }
   17608         return mVerticalScrollFactor;
   17609     }
   17610 
   17611     /**
   17612      * Gets a scale factor that determines the distance the view should scroll
   17613      * horizontally in response to {@link MotionEvent#ACTION_SCROLL}.
   17614      * @return The horizontal scroll scale factor.
   17615      * @hide
   17616      */
   17617     protected float getHorizontalScrollFactor() {
   17618         // TODO: Should use something else.
   17619         return getVerticalScrollFactor();
   17620     }
   17621 
   17622     /**
   17623      * Return the value specifying the text direction or policy that was set with
   17624      * {@link #setTextDirection(int)}.
   17625      *
   17626      * @return the defined text direction. It can be one of:
   17627      *
   17628      * {@link #TEXT_DIRECTION_INHERIT},
   17629      * {@link #TEXT_DIRECTION_FIRST_STRONG}
   17630      * {@link #TEXT_DIRECTION_ANY_RTL},
   17631      * {@link #TEXT_DIRECTION_LTR},
   17632      * {@link #TEXT_DIRECTION_RTL},
   17633      * {@link #TEXT_DIRECTION_LOCALE}
   17634      *
   17635      * @attr ref android.R.styleable#View_textDirection
   17636      *
   17637      * @hide
   17638      */
   17639     @ViewDebug.ExportedProperty(category = "text", mapping = {
   17640             @ViewDebug.IntToString(from = TEXT_DIRECTION_INHERIT, to = "INHERIT"),
   17641             @ViewDebug.IntToString(from = TEXT_DIRECTION_FIRST_STRONG, to = "FIRST_STRONG"),
   17642             @ViewDebug.IntToString(from = TEXT_DIRECTION_ANY_RTL, to = "ANY_RTL"),
   17643             @ViewDebug.IntToString(from = TEXT_DIRECTION_LTR, to = "LTR"),
   17644             @ViewDebug.IntToString(from = TEXT_DIRECTION_RTL, to = "RTL"),
   17645             @ViewDebug.IntToString(from = TEXT_DIRECTION_LOCALE, to = "LOCALE")
   17646     })
   17647     public int getRawTextDirection() {
   17648         return (mPrivateFlags2 & PFLAG2_TEXT_DIRECTION_MASK) >> PFLAG2_TEXT_DIRECTION_MASK_SHIFT;
   17649     }
   17650 
   17651     /**
   17652      * Set the text direction.
   17653      *
   17654      * @param textDirection the direction to set. Should be one of:
   17655      *
   17656      * {@link #TEXT_DIRECTION_INHERIT},
   17657      * {@link #TEXT_DIRECTION_FIRST_STRONG}
   17658      * {@link #TEXT_DIRECTION_ANY_RTL},
   17659      * {@link #TEXT_DIRECTION_LTR},
   17660      * {@link #TEXT_DIRECTION_RTL},
   17661      * {@link #TEXT_DIRECTION_LOCALE}
   17662      *
   17663      * Resolution will be done if the value is set to TEXT_DIRECTION_INHERIT. The resolution
   17664      * proceeds up the parent chain of the view to get the value. If there is no parent, then it will
   17665      * return the default {@link #TEXT_DIRECTION_FIRST_STRONG}.
   17666      *
   17667      * @attr ref android.R.styleable#View_textDirection
   17668      */
   17669     public void setTextDirection(int textDirection) {
   17670         if (getRawTextDirection() != textDirection) {
   17671             // Reset the current text direction and the resolved one
   17672             mPrivateFlags2 &= ~PFLAG2_TEXT_DIRECTION_MASK;
   17673             resetResolvedTextDirection();
   17674             // Set the new text direction
   17675             mPrivateFlags2 |= ((textDirection << PFLAG2_TEXT_DIRECTION_MASK_SHIFT) & PFLAG2_TEXT_DIRECTION_MASK);
   17676             // Do resolution
   17677             resolveTextDirection();
   17678             // Notify change
   17679             onRtlPropertiesChanged(getLayoutDirection());
   17680             // Refresh
   17681             requestLayout();
   17682             invalidate(true);
   17683         }
   17684     }
   17685 
   17686     /**
   17687      * Return the resolved text direction.
   17688      *
   17689      * @return the resolved text direction. Returns one of:
   17690      *
   17691      * {@link #TEXT_DIRECTION_FIRST_STRONG}
   17692      * {@link #TEXT_DIRECTION_ANY_RTL},
   17693      * {@link #TEXT_DIRECTION_LTR},
   17694      * {@link #TEXT_DIRECTION_RTL},
   17695      * {@link #TEXT_DIRECTION_LOCALE}
   17696      *
   17697      * @attr ref android.R.styleable#View_textDirection
   17698      */
   17699     @ViewDebug.ExportedProperty(category = "text", mapping = {
   17700             @ViewDebug.IntToString(from = TEXT_DIRECTION_INHERIT, to = "INHERIT"),
   17701             @ViewDebug.IntToString(from = TEXT_DIRECTION_FIRST_STRONG, to = "FIRST_STRONG"),
   17702             @ViewDebug.IntToString(from = TEXT_DIRECTION_ANY_RTL, to = "ANY_RTL"),
   17703             @ViewDebug.IntToString(from = TEXT_DIRECTION_LTR, to = "LTR"),
   17704             @ViewDebug.IntToString(from = TEXT_DIRECTION_RTL, to = "RTL"),
   17705             @ViewDebug.IntToString(from = TEXT_DIRECTION_LOCALE, to = "LOCALE")
   17706     })
   17707     public int getTextDirection() {
   17708         return (mPrivateFlags2 & PFLAG2_TEXT_DIRECTION_RESOLVED_MASK) >> PFLAG2_TEXT_DIRECTION_RESOLVED_MASK_SHIFT;
   17709     }
   17710 
   17711     /**
   17712      * Resolve the text direction.
   17713      *
   17714      * @return true if resolution has been done, false otherwise.
   17715      *
   17716      * @hide
   17717      */
   17718     public boolean resolveTextDirection() {
   17719         // Reset any previous text direction resolution
   17720         mPrivateFlags2 &= ~(PFLAG2_TEXT_DIRECTION_RESOLVED | PFLAG2_TEXT_DIRECTION_RESOLVED_MASK);
   17721 
   17722         if (hasRtlSupport()) {
   17723             // Set resolved text direction flag depending on text direction flag
   17724             final int textDirection = getRawTextDirection();
   17725             switch(textDirection) {
   17726                 case TEXT_DIRECTION_INHERIT:
   17727                     if (!canResolveTextDirection()) {
   17728                         // We cannot do the resolution if there is no parent, so use the default one
   17729                         mPrivateFlags2 |= PFLAG2_TEXT_DIRECTION_RESOLVED_DEFAULT;
   17730                         // Resolution will need to happen again later
   17731                         return false;
   17732                     }
   17733 
   17734                     // Parent has not yet resolved, so we still return the default
   17735                     try {
   17736                         if (!mParent.isTextDirectionResolved()) {
   17737                             mPrivateFlags2 |= PFLAG2_TEXT_DIRECTION_RESOLVED_DEFAULT;
   17738                             // Resolution will need to happen again later
   17739                             return false;
   17740                         }
   17741                     } catch (AbstractMethodError e) {
   17742                         Log.e(VIEW_LOG_TAG, mParent.getClass().getSimpleName() +
   17743                                 " does not fully implement ViewParent", e);
   17744                         mPrivateFlags2 |= PFLAG2_TEXT_DIRECTION_RESOLVED |
   17745                                 PFLAG2_TEXT_DIRECTION_RESOLVED_DEFAULT;
   17746                         return true;
   17747                     }
   17748 
   17749                     // Set current resolved direction to the same value as the parent's one
   17750                     int parentResolvedDirection;
   17751                     try {
   17752                         parentResolvedDirection = mParent.getTextDirection();
   17753                     } catch (AbstractMethodError e) {
   17754                         Log.e(VIEW_LOG_TAG, mParent.getClass().getSimpleName() +
   17755                                 " does not fully implement ViewParent", e);
   17756                         parentResolvedDirection = TEXT_DIRECTION_LTR;
   17757                     }
   17758                     switch (parentResolvedDirection) {
   17759                         case TEXT_DIRECTION_FIRST_STRONG:
   17760                         case TEXT_DIRECTION_ANY_RTL:
   17761                         case TEXT_DIRECTION_LTR:
   17762                         case TEXT_DIRECTION_RTL:
   17763                         case TEXT_DIRECTION_LOCALE:
   17764                             mPrivateFlags2 |=
   17765                                     (parentResolvedDirection << PFLAG2_TEXT_DIRECTION_RESOLVED_MASK_SHIFT);
   17766                             break;
   17767                         default:
   17768                             // Default resolved direction is "first strong" heuristic
   17769                             mPrivateFlags2 |= PFLAG2_TEXT_DIRECTION_RESOLVED_DEFAULT;
   17770                     }
   17771                     break;
   17772                 case TEXT_DIRECTION_FIRST_STRONG:
   17773                 case TEXT_DIRECTION_ANY_RTL:
   17774                 case TEXT_DIRECTION_LTR:
   17775                 case TEXT_DIRECTION_RTL:
   17776                 case TEXT_DIRECTION_LOCALE:
   17777                     // Resolved direction is the same as text direction
   17778                     mPrivateFlags2 |= (textDirection << PFLAG2_TEXT_DIRECTION_RESOLVED_MASK_SHIFT);
   17779                     break;
   17780                 default:
   17781                     // Default resolved direction is "first strong" heuristic
   17782                     mPrivateFlags2 |= PFLAG2_TEXT_DIRECTION_RESOLVED_DEFAULT;
   17783             }
   17784         } else {
   17785             // Default resolved direction is "first strong" heuristic
   17786             mPrivateFlags2 |= PFLAG2_TEXT_DIRECTION_RESOLVED_DEFAULT;
   17787         }
   17788 
   17789         // Set to resolved
   17790         mPrivateFlags2 |= PFLAG2_TEXT_DIRECTION_RESOLVED;
   17791         return true;
   17792     }
   17793 
   17794     /**
   17795      * Check if text direction resolution can be done.
   17796      *
   17797      * @return true if text direction resolution can be done otherwise return false.
   17798      */
   17799     public boolean canResolveTextDirection() {
   17800         switch (getRawTextDirection()) {
   17801             case TEXT_DIRECTION_INHERIT:
   17802                 if (mParent != null) {
   17803                     try {
   17804                         return mParent.canResolveTextDirection();
   17805                     } catch (AbstractMethodError e) {
   17806                         Log.e(VIEW_LOG_TAG, mParent.getClass().getSimpleName() +
   17807                                 " does not fully implement ViewParent", e);
   17808                     }
   17809                 }
   17810                 return false;
   17811 
   17812             default:
   17813                 return true;
   17814         }
   17815     }
   17816 
   17817     /**
   17818      * Reset resolved text direction. Text direction will be resolved during a call to
   17819      * {@link #onMeasure(int, int)}.
   17820      *
   17821      * @hide
   17822      */
   17823     public void resetResolvedTextDirection() {
   17824         // Reset any previous text direction resolution
   17825         mPrivateFlags2 &= ~(PFLAG2_TEXT_DIRECTION_RESOLVED | PFLAG2_TEXT_DIRECTION_RESOLVED_MASK);
   17826         // Set to default value
   17827         mPrivateFlags2 |= PFLAG2_TEXT_DIRECTION_RESOLVED_DEFAULT;
   17828     }
   17829 
   17830     /**
   17831      * @return true if text direction is inherited.
   17832      *
   17833      * @hide
   17834      */
   17835     public boolean isTextDirectionInherited() {
   17836         return (getRawTextDirection() == TEXT_DIRECTION_INHERIT);
   17837     }
   17838 
   17839     /**
   17840      * @return true if text direction is resolved.
   17841      */
   17842     public boolean isTextDirectionResolved() {
   17843         return (mPrivateFlags2 & PFLAG2_TEXT_DIRECTION_RESOLVED) == PFLAG2_TEXT_DIRECTION_RESOLVED;
   17844     }
   17845 
   17846     /**
   17847      * Return the value specifying the text alignment or policy that was set with
   17848      * {@link #setTextAlignment(int)}.
   17849      *
   17850      * @return the defined text alignment. It can be one of:
   17851      *
   17852      * {@link #TEXT_ALIGNMENT_INHERIT},
   17853      * {@link #TEXT_ALIGNMENT_GRAVITY},
   17854      * {@link #TEXT_ALIGNMENT_CENTER},
   17855      * {@link #TEXT_ALIGNMENT_TEXT_START},
   17856      * {@link #TEXT_ALIGNMENT_TEXT_END},
   17857      * {@link #TEXT_ALIGNMENT_VIEW_START},
   17858      * {@link #TEXT_ALIGNMENT_VIEW_END}
   17859      *
   17860      * @attr ref android.R.styleable#View_textAlignment
   17861      *
   17862      * @hide
   17863      */
   17864     @ViewDebug.ExportedProperty(category = "text", mapping = {
   17865             @ViewDebug.IntToString(from = TEXT_ALIGNMENT_INHERIT, to = "INHERIT"),
   17866             @ViewDebug.IntToString(from = TEXT_ALIGNMENT_GRAVITY, to = "GRAVITY"),
   17867             @ViewDebug.IntToString(from = TEXT_ALIGNMENT_TEXT_START, to = "TEXT_START"),
   17868             @ViewDebug.IntToString(from = TEXT_ALIGNMENT_TEXT_END, to = "TEXT_END"),
   17869             @ViewDebug.IntToString(from = TEXT_ALIGNMENT_CENTER, to = "CENTER"),
   17870             @ViewDebug.IntToString(from = TEXT_ALIGNMENT_VIEW_START, to = "VIEW_START"),
   17871             @ViewDebug.IntToString(from = TEXT_ALIGNMENT_VIEW_END, to = "VIEW_END")
   17872     })
   17873     public int getRawTextAlignment() {
   17874         return (mPrivateFlags2 & PFLAG2_TEXT_ALIGNMENT_MASK) >> PFLAG2_TEXT_ALIGNMENT_MASK_SHIFT;
   17875     }
   17876 
   17877     /**
   17878      * Set the text alignment.
   17879      *
   17880      * @param textAlignment The text alignment to set. Should be one of
   17881      *
   17882      * {@link #TEXT_ALIGNMENT_INHERIT},
   17883      * {@link #TEXT_ALIGNMENT_GRAVITY},
   17884      * {@link #TEXT_ALIGNMENT_CENTER},
   17885      * {@link #TEXT_ALIGNMENT_TEXT_START},
   17886      * {@link #TEXT_ALIGNMENT_TEXT_END},
   17887      * {@link #TEXT_ALIGNMENT_VIEW_START},
   17888      * {@link #TEXT_ALIGNMENT_VIEW_END}
   17889      *
   17890      * Resolution will be done if the value is set to TEXT_ALIGNMENT_INHERIT. The resolution
   17891      * proceeds up the parent chain of the view to get the value. If there is no parent, then it
   17892      * will return the default {@link #TEXT_ALIGNMENT_GRAVITY}.
   17893      *
   17894      * @attr ref android.R.styleable#View_textAlignment
   17895      */
   17896     public void setTextAlignment(int textAlignment) {
   17897         if (textAlignment != getRawTextAlignment()) {
   17898             // Reset the current and resolved text alignment
   17899             mPrivateFlags2 &= ~PFLAG2_TEXT_ALIGNMENT_MASK;
   17900             resetResolvedTextAlignment();
   17901             // Set the new text alignment
   17902             mPrivateFlags2 |=
   17903                     ((textAlignment << PFLAG2_TEXT_ALIGNMENT_MASK_SHIFT) & PFLAG2_TEXT_ALIGNMENT_MASK);
   17904             // Do resolution
   17905             resolveTextAlignment();
   17906             // Notify change
   17907             onRtlPropertiesChanged(getLayoutDirection());
   17908             // Refresh
   17909             requestLayout();
   17910             invalidate(true);
   17911         }
   17912     }
   17913 
   17914     /**
   17915      * Return the resolved text alignment.
   17916      *
   17917      * @return the resolved text alignment. Returns one of:
   17918      *
   17919      * {@link #TEXT_ALIGNMENT_GRAVITY},
   17920      * {@link #TEXT_ALIGNMENT_CENTER},
   17921      * {@link #TEXT_ALIGNMENT_TEXT_START},
   17922      * {@link #TEXT_ALIGNMENT_TEXT_END},
   17923      * {@link #TEXT_ALIGNMENT_VIEW_START},
   17924      * {@link #TEXT_ALIGNMENT_VIEW_END}
   17925      *
   17926      * @attr ref android.R.styleable#View_textAlignment
   17927      */
   17928     @ViewDebug.ExportedProperty(category = "text", mapping = {
   17929             @ViewDebug.IntToString(from = TEXT_ALIGNMENT_INHERIT, to = "INHERIT"),
   17930             @ViewDebug.IntToString(from = TEXT_ALIGNMENT_GRAVITY, to = "GRAVITY"),
   17931             @ViewDebug.IntToString(from = TEXT_ALIGNMENT_TEXT_START, to = "TEXT_START"),
   17932             @ViewDebug.IntToString(from = TEXT_ALIGNMENT_TEXT_END, to = "TEXT_END"),
   17933             @ViewDebug.IntToString(from = TEXT_ALIGNMENT_CENTER, to = "CENTER"),
   17934             @ViewDebug.IntToString(from = TEXT_ALIGNMENT_VIEW_START, to = "VIEW_START"),
   17935             @ViewDebug.IntToString(from = TEXT_ALIGNMENT_VIEW_END, to = "VIEW_END")
   17936     })
   17937     public int getTextAlignment() {
   17938         return (mPrivateFlags2 & PFLAG2_TEXT_ALIGNMENT_RESOLVED_MASK) >>
   17939                 PFLAG2_TEXT_ALIGNMENT_RESOLVED_MASK_SHIFT;
   17940     }
   17941 
   17942     /**
   17943      * Resolve the text alignment.
   17944      *
   17945      * @return true if resolution has been done, false otherwise.
   17946      *
   17947      * @hide
   17948      */
   17949     public boolean resolveTextAlignment() {
   17950         // Reset any previous text alignment resolution
   17951         mPrivateFlags2 &= ~(PFLAG2_TEXT_ALIGNMENT_RESOLVED | PFLAG2_TEXT_ALIGNMENT_RESOLVED_MASK);
   17952 
   17953         if (hasRtlSupport()) {
   17954             // Set resolved text alignment flag depending on text alignment flag
   17955             final int textAlignment = getRawTextAlignment();
   17956             switch (textAlignment) {
   17957                 case TEXT_ALIGNMENT_INHERIT:
   17958                     // Check if we can resolve the text alignment
   17959                     if (!canResolveTextAlignment()) {
   17960                         // We cannot do the resolution if there is no parent so use the default
   17961                         mPrivateFlags2 |= PFLAG2_TEXT_ALIGNMENT_RESOLVED_DEFAULT;
   17962                         // Resolution will need to happen again later
   17963                         return false;
   17964                     }
   17965 
   17966                     // Parent has not yet resolved, so we still return the default
   17967                     try {
   17968                         if (!mParent.isTextAlignmentResolved()) {
   17969                             mPrivateFlags2 |= PFLAG2_TEXT_ALIGNMENT_RESOLVED_DEFAULT;
   17970                             // Resolution will need to happen again later
   17971                             return false;
   17972                         }
   17973                     } catch (AbstractMethodError e) {
   17974                         Log.e(VIEW_LOG_TAG, mParent.getClass().getSimpleName() +
   17975                                 " does not fully implement ViewParent", e);
   17976                         mPrivateFlags2 |= PFLAG2_TEXT_ALIGNMENT_RESOLVED |
   17977                                 PFLAG2_TEXT_ALIGNMENT_RESOLVED_DEFAULT;
   17978                         return true;
   17979                     }
   17980 
   17981                     int parentResolvedTextAlignment;
   17982                     try {
   17983                         parentResolvedTextAlignment = mParent.getTextAlignment();
   17984                     } catch (AbstractMethodError e) {
   17985                         Log.e(VIEW_LOG_TAG, mParent.getClass().getSimpleName() +
   17986                                 " does not fully implement ViewParent", e);
   17987                         parentResolvedTextAlignment = TEXT_ALIGNMENT_GRAVITY;
   17988                     }
   17989                     switch (parentResolvedTextAlignment) {
   17990                         case TEXT_ALIGNMENT_GRAVITY:
   17991                         case TEXT_ALIGNMENT_TEXT_START:
   17992                         case TEXT_ALIGNMENT_TEXT_END:
   17993                         case TEXT_ALIGNMENT_CENTER:
   17994                         case TEXT_ALIGNMENT_VIEW_START:
   17995                         case TEXT_ALIGNMENT_VIEW_END:
   17996                             // Resolved text alignment is the same as the parent resolved
   17997                             // text alignment
   17998                             mPrivateFlags2 |=
   17999                                     (parentResolvedTextAlignment << PFLAG2_TEXT_ALIGNMENT_RESOLVED_MASK_SHIFT);
   18000                             break;
   18001                         default:
   18002                             // Use default resolved text alignment
   18003                             mPrivateFlags2 |= PFLAG2_TEXT_ALIGNMENT_RESOLVED_DEFAULT;
   18004                     }
   18005                     break;
   18006                 case TEXT_ALIGNMENT_GRAVITY:
   18007                 case TEXT_ALIGNMENT_TEXT_START:
   18008                 case TEXT_ALIGNMENT_TEXT_END:
   18009                 case TEXT_ALIGNMENT_CENTER:
   18010                 case TEXT_ALIGNMENT_VIEW_START:
   18011                 case TEXT_ALIGNMENT_VIEW_END:
   18012                     // Resolved text alignment is the same as text alignment
   18013                     mPrivateFlags2 |= (textAlignment << PFLAG2_TEXT_ALIGNMENT_RESOLVED_MASK_SHIFT);
   18014                     break;
   18015                 default:
   18016                     // Use default resolved text alignment
   18017                     mPrivateFlags2 |= PFLAG2_TEXT_ALIGNMENT_RESOLVED_DEFAULT;
   18018             }
   18019         } else {
   18020             // Use default resolved text alignment
   18021             mPrivateFlags2 |= PFLAG2_TEXT_ALIGNMENT_RESOLVED_DEFAULT;
   18022         }
   18023 
   18024         // Set the resolved
   18025         mPrivateFlags2 |= PFLAG2_TEXT_ALIGNMENT_RESOLVED;
   18026         return true;
   18027     }
   18028 
   18029     /**
   18030      * Check if text alignment resolution can be done.
   18031      *
   18032      * @return true if text alignment resolution can be done otherwise return false.
   18033      */
   18034     public boolean canResolveTextAlignment() {
   18035         switch (getRawTextAlignment()) {
   18036             case TEXT_DIRECTION_INHERIT:
   18037                 if (mParent != null) {
   18038                     try {
   18039                         return mParent.canResolveTextAlignment();
   18040                     } catch (AbstractMethodError e) {
   18041                         Log.e(VIEW_LOG_TAG, mParent.getClass().getSimpleName() +
   18042                                 " does not fully implement ViewParent", e);
   18043                     }
   18044                 }
   18045                 return false;
   18046 
   18047             default:
   18048                 return true;
   18049         }
   18050     }
   18051 
   18052     /**
   18053      * Reset resolved text alignment. Text alignment will be resolved during a call to
   18054      * {@link #onMeasure(int, int)}.
   18055      *
   18056      * @hide
   18057      */
   18058     public void resetResolvedTextAlignment() {
   18059         // Reset any previous text alignment resolution
   18060         mPrivateFlags2 &= ~(PFLAG2_TEXT_ALIGNMENT_RESOLVED | PFLAG2_TEXT_ALIGNMENT_RESOLVED_MASK);
   18061         // Set to default
   18062         mPrivateFlags2 |= PFLAG2_TEXT_ALIGNMENT_RESOLVED_DEFAULT;
   18063     }
   18064 
   18065     /**
   18066      * @return true if text alignment is inherited.
   18067      *
   18068      * @hide
   18069      */
   18070     public boolean isTextAlignmentInherited() {
   18071         return (getRawTextAlignment() == TEXT_ALIGNMENT_INHERIT);
   18072     }
   18073 
   18074     /**
   18075      * @return true if text alignment is resolved.
   18076      */
   18077     public boolean isTextAlignmentResolved() {
   18078         return (mPrivateFlags2 & PFLAG2_TEXT_ALIGNMENT_RESOLVED) == PFLAG2_TEXT_ALIGNMENT_RESOLVED;
   18079     }
   18080 
   18081     /**
   18082      * Generate a value suitable for use in {@link #setId(int)}.
   18083      * This value will not collide with ID values generated at build time by aapt for R.id.
   18084      *
   18085      * @return a generated ID value
   18086      */
   18087     public static int generateViewId() {
   18088         for (;;) {
   18089             final int result = sNextGeneratedId.get();
   18090             // aapt-generated IDs have the high byte nonzero; clamp to the range under that.
   18091             int newValue = result + 1;
   18092             if (newValue > 0x00FFFFFF) newValue = 1; // Roll over to 1, not 0.
   18093             if (sNextGeneratedId.compareAndSet(result, newValue)) {
   18094                 return result;
   18095             }
   18096         }
   18097     }
   18098 
   18099     //
   18100     // Properties
   18101     //
   18102     /**
   18103      * A Property wrapper around the <code>alpha</code> functionality handled by the
   18104      * {@link View#setAlpha(float)} and {@link View#getAlpha()} methods.
   18105      */
   18106     public static final Property<View, Float> ALPHA = new FloatProperty<View>("alpha") {
   18107         @Override
   18108         public void setValue(View object, float value) {
   18109             object.setAlpha(value);
   18110         }
   18111 
   18112         @Override
   18113         public Float get(View object) {
   18114             return object.getAlpha();
   18115         }
   18116     };
   18117 
   18118     /**
   18119      * A Property wrapper around the <code>translationX</code> functionality handled by the
   18120      * {@link View#setTranslationX(float)} and {@link View#getTranslationX()} methods.
   18121      */
   18122     public static final Property<View, Float> TRANSLATION_X = new FloatProperty<View>("translationX") {
   18123         @Override
   18124         public void setValue(View object, float value) {
   18125             object.setTranslationX(value);
   18126         }
   18127 
   18128                 @Override
   18129         public Float get(View object) {
   18130             return object.getTranslationX();
   18131         }
   18132     };
   18133 
   18134     /**
   18135      * A Property wrapper around the <code>translationY</code> functionality handled by the
   18136      * {@link View#setTranslationY(float)} and {@link View#getTranslationY()} methods.
   18137      */
   18138     public static final Property<View, Float> TRANSLATION_Y = new FloatProperty<View>("translationY") {
   18139         @Override
   18140         public void setValue(View object, float value) {
   18141             object.setTranslationY(value);
   18142         }
   18143 
   18144         @Override
   18145         public Float get(View object) {
   18146             return object.getTranslationY();
   18147         }
   18148     };
   18149 
   18150     /**
   18151      * A Property wrapper around the <code>x</code> functionality handled by the
   18152      * {@link View#setX(float)} and {@link View#getX()} methods.
   18153      */
   18154     public static final Property<View, Float> X = new FloatProperty<View>("x") {
   18155         @Override
   18156         public void setValue(View object, float value) {
   18157             object.setX(value);
   18158         }
   18159 
   18160         @Override
   18161         public Float get(View object) {
   18162             return object.getX();
   18163         }
   18164     };
   18165 
   18166     /**
   18167      * A Property wrapper around the <code>y</code> functionality handled by the
   18168      * {@link View#setY(float)} and {@link View#getY()} methods.
   18169      */
   18170     public static final Property<View, Float> Y = new FloatProperty<View>("y") {
   18171         @Override
   18172         public void setValue(View object, float value) {
   18173             object.setY(value);
   18174         }
   18175 
   18176         @Override
   18177         public Float get(View object) {
   18178             return object.getY();
   18179         }
   18180     };
   18181 
   18182     /**
   18183      * A Property wrapper around the <code>rotation</code> functionality handled by the
   18184      * {@link View#setRotation(float)} and {@link View#getRotation()} methods.
   18185      */
   18186     public static final Property<View, Float> ROTATION = new FloatProperty<View>("rotation") {
   18187         @Override
   18188         public void setValue(View object, float value) {
   18189             object.setRotation(value);
   18190         }
   18191 
   18192         @Override
   18193         public Float get(View object) {
   18194             return object.getRotation();
   18195         }
   18196     };
   18197 
   18198     /**
   18199      * A Property wrapper around the <code>rotationX</code> functionality handled by the
   18200      * {@link View#setRotationX(float)} and {@link View#getRotationX()} methods.
   18201      */
   18202     public static final Property<View, Float> ROTATION_X = new FloatProperty<View>("rotationX") {
   18203         @Override
   18204         public void setValue(View object, float value) {
   18205             object.setRotationX(value);
   18206         }
   18207 
   18208         @Override
   18209         public Float get(View object) {
   18210             return object.getRotationX();
   18211         }
   18212     };
   18213 
   18214     /**
   18215      * A Property wrapper around the <code>rotationY</code> functionality handled by the
   18216      * {@link View#setRotationY(float)} and {@link View#getRotationY()} methods.
   18217      */
   18218     public static final Property<View, Float> ROTATION_Y = new FloatProperty<View>("rotationY") {
   18219         @Override
   18220         public void setValue(View object, float value) {
   18221             object.setRotationY(value);
   18222         }
   18223 
   18224         @Override
   18225         public Float get(View object) {
   18226             return object.getRotationY();
   18227         }
   18228     };
   18229 
   18230     /**
   18231      * A Property wrapper around the <code>scaleX</code> functionality handled by the
   18232      * {@link View#setScaleX(float)} and {@link View#getScaleX()} methods.
   18233      */
   18234     public static final Property<View, Float> SCALE_X = new FloatProperty<View>("scaleX") {
   18235         @Override
   18236         public void setValue(View object, float value) {
   18237             object.setScaleX(value);
   18238         }
   18239 
   18240         @Override
   18241         public Float get(View object) {
   18242             return object.getScaleX();
   18243         }
   18244     };
   18245 
   18246     /**
   18247      * A Property wrapper around the <code>scaleY</code> functionality handled by the
   18248      * {@link View#setScaleY(float)} and {@link View#getScaleY()} methods.
   18249      */
   18250     public static final Property<View, Float> SCALE_Y = new FloatProperty<View>("scaleY") {
   18251         @Override
   18252         public void setValue(View object, float value) {
   18253             object.setScaleY(value);
   18254         }
   18255 
   18256         @Override
   18257         public Float get(View object) {
   18258             return object.getScaleY();
   18259         }
   18260     };
   18261 
   18262     /**
   18263      * A MeasureSpec encapsulates the layout requirements passed from parent to child.
   18264      * Each MeasureSpec represents a requirement for either the width or the height.
   18265      * A MeasureSpec is comprised of a size and a mode. There are three possible
   18266      * modes:
   18267      * <dl>
   18268      * <dt>UNSPECIFIED</dt>
   18269      * <dd>
   18270      * The parent has not imposed any constraint on the child. It can be whatever size
   18271      * it wants.
   18272      * </dd>
   18273      *
   18274      * <dt>EXACTLY</dt>
   18275      * <dd>
   18276      * The parent has determined an exact size for the child. The child is going to be
   18277      * given those bounds regardless of how big it wants to be.
   18278      * </dd>
   18279      *
   18280      * <dt>AT_MOST</dt>
   18281      * <dd>
   18282      * The child can be as large as it wants up to the specified size.
   18283      * </dd>
   18284      * </dl>
   18285      *
   18286      * MeasureSpecs are implemented as ints to reduce object allocation. This class
   18287      * is provided to pack and unpack the &lt;size, mode&gt; tuple into the int.
   18288      */
   18289     public static class MeasureSpec {
   18290         private static final int MODE_SHIFT = 30;
   18291         private static final int MODE_MASK  = 0x3 << MODE_SHIFT;
   18292 
   18293         /**
   18294          * Measure specification mode: The parent has not imposed any constraint
   18295          * on the child. It can be whatever size it wants.
   18296          */
   18297         public static final int UNSPECIFIED = 0 << MODE_SHIFT;
   18298 
   18299         /**
   18300          * Measure specification mode: The parent has determined an exact size
   18301          * for the child. The child is going to be given those bounds regardless
   18302          * of how big it wants to be.
   18303          */
   18304         public static final int EXACTLY     = 1 << MODE_SHIFT;
   18305 
   18306         /**
   18307          * Measure specification mode: The child can be as large as it wants up
   18308          * to the specified size.
   18309          */
   18310         public static final int AT_MOST     = 2 << MODE_SHIFT;
   18311 
   18312         /**
   18313          * Creates a measure specification based on the supplied size and mode.
   18314          *
   18315          * The mode must always be one of the following:
   18316          * <ul>
   18317          *  <li>{@link android.view.View.MeasureSpec#UNSPECIFIED}</li>
   18318          *  <li>{@link android.view.View.MeasureSpec#EXACTLY}</li>
   18319          *  <li>{@link android.view.View.MeasureSpec#AT_MOST}</li>
   18320          * </ul>
   18321          *
   18322          * <p><strong>Note:</strong> On API level 17 and lower, makeMeasureSpec's
   18323          * implementation was such that the order of arguments did not matter
   18324          * and overflow in either value could impact the resulting MeasureSpec.
   18325          * {@link android.widget.RelativeLayout} was affected by this bug.
   18326          * Apps targeting API levels greater than 17 will get the fixed, more strict
   18327          * behavior.</p>
   18328          *
   18329          * @param size the size of the measure specification
   18330          * @param mode the mode of the measure specification
   18331          * @return the measure specification based on size and mode
   18332          */
   18333         public static int makeMeasureSpec(int size, int mode) {
   18334             if (sUseBrokenMakeMeasureSpec) {
   18335                 return size + mode;
   18336             } else {
   18337                 return (size & ~MODE_MASK) | (mode & MODE_MASK);
   18338             }
   18339         }
   18340 
   18341         /**
   18342          * Extracts the mode from the supplied measure specification.
   18343          *
   18344          * @param measureSpec the measure specification to extract the mode from
   18345          * @return {@link android.view.View.MeasureSpec#UNSPECIFIED},
   18346          *         {@link android.view.View.MeasureSpec#AT_MOST} or
   18347          *         {@link android.view.View.MeasureSpec#EXACTLY}
   18348          */
   18349         public static int getMode(int measureSpec) {
   18350             return (measureSpec & MODE_MASK);
   18351         }
   18352 
   18353         /**
   18354          * Extracts the size from the supplied measure specification.
   18355          *
   18356          * @param measureSpec the measure specification to extract the size from
   18357          * @return the size in pixels defined in the supplied measure specification
   18358          */
   18359         public static int getSize(int measureSpec) {
   18360             return (measureSpec & ~MODE_MASK);
   18361         }
   18362 
   18363         static int adjust(int measureSpec, int delta) {
   18364             return makeMeasureSpec(getSize(measureSpec + delta), getMode(measureSpec));
   18365         }
   18366 
   18367         /**
   18368          * Returns a String representation of the specified measure
   18369          * specification.
   18370          *
   18371          * @param measureSpec the measure specification to convert to a String
   18372          * @return a String with the following format: "MeasureSpec: MODE SIZE"
   18373          */
   18374         public static String toString(int measureSpec) {
   18375             int mode = getMode(measureSpec);
   18376             int size = getSize(measureSpec);
   18377 
   18378             StringBuilder sb = new StringBuilder("MeasureSpec: ");
   18379 
   18380             if (mode == UNSPECIFIED)
   18381                 sb.append("UNSPECIFIED ");
   18382             else if (mode == EXACTLY)
   18383                 sb.append("EXACTLY ");
   18384             else if (mode == AT_MOST)
   18385                 sb.append("AT_MOST ");
   18386             else
   18387                 sb.append(mode).append(" ");
   18388 
   18389             sb.append(size);
   18390             return sb.toString();
   18391         }
   18392     }
   18393 
   18394     class CheckForLongPress implements Runnable {
   18395 
   18396         private int mOriginalWindowAttachCount;
   18397 
   18398         public void run() {
   18399             if (isPressed() && (mParent != null)
   18400                     && mOriginalWindowAttachCount == mWindowAttachCount) {
   18401                 if (performLongClick()) {
   18402                     mHasPerformedLongPress = true;
   18403                 }
   18404             }
   18405         }
   18406 
   18407         public void rememberWindowAttachCount() {
   18408             mOriginalWindowAttachCount = mWindowAttachCount;
   18409         }
   18410     }
   18411 
   18412     private final class CheckForTap implements Runnable {
   18413         public void run() {
   18414             mPrivateFlags &= ~PFLAG_PREPRESSED;
   18415             setPressed(true);
   18416             checkForLongClick(ViewConfiguration.getTapTimeout());
   18417         }
   18418     }
   18419 
   18420     private final class PerformClick implements Runnable {
   18421         public void run() {
   18422             performClick();
   18423         }
   18424     }
   18425 
   18426     /** @hide */
   18427     public void hackTurnOffWindowResizeAnim(boolean off) {
   18428         mAttachInfo.mTurnOffWindowResizeAnim = off;
   18429     }
   18430 
   18431     /**
   18432      * This method returns a ViewPropertyAnimator object, which can be used to animate
   18433      * specific properties on this View.
   18434      *
   18435      * @return ViewPropertyAnimator The ViewPropertyAnimator associated with this View.
   18436      */
   18437     public ViewPropertyAnimator animate() {
   18438         if (mAnimator == null) {
   18439             mAnimator = new ViewPropertyAnimator(this);
   18440         }
   18441         return mAnimator;
   18442     }
   18443 
   18444     /**
   18445      * Interface definition for a callback to be invoked when a hardware key event is
   18446      * dispatched to this view. The callback will be invoked before the key event is
   18447      * given to the view. This is only useful for hardware keyboards; a software input
   18448      * method has no obligation to trigger this listener.
   18449      */
   18450     public interface OnKeyListener {
   18451         /**
   18452          * Called when a hardware key is dispatched to a view. This allows listeners to
   18453          * get a chance to respond before the target view.
   18454          * <p>Key presses in software keyboards will generally NOT trigger this method,
   18455          * although some may elect to do so in some situations. Do not assume a
   18456          * software input method has to be key-based; even if it is, it may use key presses
   18457          * in a different way than you expect, so there is no way to reliably catch soft
   18458          * input key presses.
   18459          *
   18460          * @param v The view the key has been dispatched to.
   18461          * @param keyCode The code for the physical key that was pressed
   18462          * @param event The KeyEvent object containing full information about
   18463          *        the event.
   18464          * @return True if the listener has consumed the event, false otherwise.
   18465          */
   18466         boolean onKey(View v, int keyCode, KeyEvent event);
   18467     }
   18468 
   18469     /**
   18470      * Interface definition for a callback to be invoked when a touch event is
   18471      * dispatched to this view. The callback will be invoked before the touch
   18472      * event is given to the view.
   18473      */
   18474     public interface OnTouchListener {
   18475         /**
   18476          * Called when a touch event is dispatched to a view. This allows listeners to
   18477          * get a chance to respond before the target view.
   18478          *
   18479          * @param v The view the touch event has been dispatched to.
   18480          * @param event The MotionEvent object containing full information about
   18481          *        the event.
   18482          * @return True if the listener has consumed the event, false otherwise.
   18483          */
   18484         boolean onTouch(View v, MotionEvent event);
   18485     }
   18486 
   18487     /**
   18488      * Interface definition for a callback to be invoked when a hover event is
   18489      * dispatched to this view. The callback will be invoked before the hover
   18490      * event is given to the view.
   18491      */
   18492     public interface OnHoverListener {
   18493         /**
   18494          * Called when a hover event is dispatched to a view. This allows listeners to
   18495          * get a chance to respond before the target view.
   18496          *
   18497          * @param v The view the hover event has been dispatched to.
   18498          * @param event The MotionEvent object containing full information about
   18499          *        the event.
   18500          * @return True if the listener has consumed the event, false otherwise.
   18501          */
   18502         boolean onHover(View v, MotionEvent event);
   18503     }
   18504 
   18505     /**
   18506      * Interface definition for a callback to be invoked when a generic motion event is
   18507      * dispatched to this view. The callback will be invoked before the generic motion
   18508      * event is given to the view.
   18509      */
   18510     public interface OnGenericMotionListener {
   18511         /**
   18512          * Called when a generic motion event is dispatched to a view. This allows listeners to
   18513          * get a chance to respond before the target view.
   18514          *
   18515          * @param v The view the generic motion event has been dispatched to.
   18516          * @param event The MotionEvent object containing full information about
   18517          *        the event.
   18518          * @return True if the listener has consumed the event, false otherwise.
   18519          */
   18520         boolean onGenericMotion(View v, MotionEvent event);
   18521     }
   18522 
   18523     /**
   18524      * Interface definition for a callback to be invoked when a view has been clicked and held.
   18525      */
   18526     public interface OnLongClickListener {
   18527         /**
   18528          * Called when a view has been clicked and held.
   18529          *
   18530          * @param v The view that was clicked and held.
   18531          *
   18532          * @return true if the callback consumed the long click, false otherwise.
   18533          */
   18534         boolean onLongClick(View v);
   18535     }
   18536 
   18537     /**
   18538      * Interface definition for a callback to be invoked when a drag is being dispatched
   18539      * to this view.  The callback will be invoked before the hosting view's own
   18540      * onDrag(event) method.  If the listener wants to fall back to the hosting view's
   18541      * onDrag(event) behavior, it should return 'false' from this callback.
   18542      *
   18543      * <div class="special reference">
   18544      * <h3>Developer Guides</h3>
   18545      * <p>For a guide to implementing drag and drop features, read the
   18546      * <a href="{@docRoot}guide/topics/ui/drag-drop.html">Drag and Drop</a> developer guide.</p>
   18547      * </div>
   18548      */
   18549     public interface OnDragListener {
   18550         /**
   18551          * Called when a drag event is dispatched to a view. This allows listeners
   18552          * to get a chance to override base View behavior.
   18553          *
   18554          * @param v The View that received the drag event.
   18555          * @param event The {@link android.view.DragEvent} object for the drag event.
   18556          * @return {@code true} if the drag event was handled successfully, or {@code false}
   18557          * if the drag event was not handled. Note that {@code false} will trigger the View
   18558          * to call its {@link #onDragEvent(DragEvent) onDragEvent()} handler.
   18559          */
   18560         boolean onDrag(View v, DragEvent event);
   18561     }
   18562 
   18563     /**
   18564      * Interface definition for a callback to be invoked when the focus state of
   18565      * a view changed.
   18566      */
   18567     public interface OnFocusChangeListener {
   18568         /**
   18569          * Called when the focus state of a view has changed.
   18570          *
   18571          * @param v The view whose state has changed.
   18572          * @param hasFocus The new focus state of v.
   18573          */
   18574         void onFocusChange(View v, boolean hasFocus);
   18575     }
   18576 
   18577     /**
   18578      * Interface definition for a callback to be invoked when a view is clicked.
   18579      */
   18580     public interface OnClickListener {
   18581         /**
   18582          * Called when a view has been clicked.
   18583          *
   18584          * @param v The view that was clicked.
   18585          */
   18586         void onClick(View v);
   18587     }
   18588 
   18589     /**
   18590      * Interface definition for a callback to be invoked when the context menu
   18591      * for this view is being built.
   18592      */
   18593     public interface OnCreateContextMenuListener {
   18594         /**
   18595          * Called when the context menu for this view is being built. It is not
   18596          * safe to hold onto the menu after this method returns.
   18597          *
   18598          * @param menu The context menu that is being built
   18599          * @param v The view for which the context menu is being built
   18600          * @param menuInfo Extra information about the item for which the
   18601          *            context menu should be shown. This information will vary
   18602          *            depending on the class of v.
   18603          */
   18604         void onCreateContextMenu(ContextMenu menu, View v, ContextMenuInfo menuInfo);
   18605     }
   18606 
   18607     /**
   18608      * Interface definition for a callback to be invoked when the status bar changes
   18609      * visibility.  This reports <strong>global</strong> changes to the system UI
   18610      * state, not what the application is requesting.
   18611      *
   18612      * @see View#setOnSystemUiVisibilityChangeListener(android.view.View.OnSystemUiVisibilityChangeListener)
   18613      */
   18614     public interface OnSystemUiVisibilityChangeListener {
   18615         /**
   18616          * Called when the status bar changes visibility because of a call to
   18617          * {@link View#setSystemUiVisibility(int)}.
   18618          *
   18619          * @param visibility  Bitwise-or of flags {@link #SYSTEM_UI_FLAG_LOW_PROFILE},
   18620          * {@link #SYSTEM_UI_FLAG_HIDE_NAVIGATION}, and {@link #SYSTEM_UI_FLAG_FULLSCREEN}.
   18621          * This tells you the <strong>global</strong> state of these UI visibility
   18622          * flags, not what your app is currently applying.
   18623          */
   18624         public void onSystemUiVisibilityChange(int visibility);
   18625     }
   18626 
   18627     /**
   18628      * Interface definition for a callback to be invoked when this view is attached
   18629      * or detached from its window.
   18630      */
   18631     public interface OnAttachStateChangeListener {
   18632         /**
   18633          * Called when the view is attached to a window.
   18634          * @param v The view that was attached
   18635          */
   18636         public void onViewAttachedToWindow(View v);
   18637         /**
   18638          * Called when the view is detached from a window.
   18639          * @param v The view that was detached
   18640          */
   18641         public void onViewDetachedFromWindow(View v);
   18642     }
   18643 
   18644     private final class UnsetPressedState implements Runnable {
   18645         public void run() {
   18646             setPressed(false);
   18647         }
   18648     }
   18649 
   18650     /**
   18651      * Base class for derived classes that want to save and restore their own
   18652      * state in {@link android.view.View#onSaveInstanceState()}.
   18653      */
   18654     public static class BaseSavedState extends AbsSavedState {
   18655         /**
   18656          * Constructor used when reading from a parcel. Reads the state of the superclass.
   18657          *
   18658          * @param source
   18659          */
   18660         public BaseSavedState(Parcel source) {
   18661             super(source);
   18662         }
   18663 
   18664         /**
   18665          * Constructor called by derived classes when creating their SavedState objects
   18666          *
   18667          * @param superState The state of the superclass of this view
   18668          */
   18669         public BaseSavedState(Parcelable superState) {
   18670             super(superState);
   18671         }
   18672 
   18673         public static final Parcelable.Creator<BaseSavedState> CREATOR =
   18674                 new Parcelable.Creator<BaseSavedState>() {
   18675             public BaseSavedState createFromParcel(Parcel in) {
   18676                 return new BaseSavedState(in);
   18677             }
   18678 
   18679             public BaseSavedState[] newArray(int size) {
   18680                 return new BaseSavedState[size];
   18681             }
   18682         };
   18683     }
   18684 
   18685     /**
   18686      * A set of information given to a view when it is attached to its parent
   18687      * window.
   18688      */
   18689     static class AttachInfo {
   18690         interface Callbacks {
   18691             void playSoundEffect(int effectId);
   18692             boolean performHapticFeedback(int effectId, boolean always);
   18693         }
   18694 
   18695         /**
   18696          * InvalidateInfo is used to post invalidate(int, int, int, int) messages
   18697          * to a Handler. This class contains the target (View) to invalidate and
   18698          * the coordinates of the dirty rectangle.
   18699          *
   18700          * For performance purposes, this class also implements a pool of up to
   18701          * POOL_LIMIT objects that get reused. This reduces memory allocations
   18702          * whenever possible.
   18703          */
   18704         static class InvalidateInfo {
   18705             private static final int POOL_LIMIT = 10;
   18706 
   18707             private static final SynchronizedPool<InvalidateInfo> sPool =
   18708                     new SynchronizedPool<InvalidateInfo>(POOL_LIMIT);
   18709 
   18710             View target;
   18711 
   18712             int left;
   18713             int top;
   18714             int right;
   18715             int bottom;
   18716 
   18717             public static InvalidateInfo obtain() {
   18718                 InvalidateInfo instance = sPool.acquire();
   18719                 return (instance != null) ? instance : new InvalidateInfo();
   18720             }
   18721 
   18722             public void recycle() {
   18723                 target = null;
   18724                 sPool.release(this);
   18725             }
   18726         }
   18727 
   18728         final IWindowSession mSession;
   18729 
   18730         final IWindow mWindow;
   18731 
   18732         final IBinder mWindowToken;
   18733 
   18734         final Display mDisplay;
   18735 
   18736         final Callbacks mRootCallbacks;
   18737 
   18738         HardwareCanvas mHardwareCanvas;
   18739 
   18740         IWindowId mIWindowId;
   18741         WindowId mWindowId;
   18742 
   18743         /**
   18744          * The top view of the hierarchy.
   18745          */
   18746         View mRootView;
   18747 
   18748         IBinder mPanelParentWindowToken;
   18749         Surface mSurface;
   18750 
   18751         boolean mHardwareAccelerated;
   18752         boolean mHardwareAccelerationRequested;
   18753         HardwareRenderer mHardwareRenderer;
   18754 
   18755         boolean mScreenOn;
   18756 
   18757         /**
   18758          * Scale factor used by the compatibility mode
   18759          */
   18760         float mApplicationScale;
   18761 
   18762         /**
   18763          * Indicates whether the application is in compatibility mode
   18764          */
   18765         boolean mScalingRequired;
   18766 
   18767         /**
   18768          * If set, ViewRootImpl doesn't use its lame animation for when the window resizes.
   18769          */
   18770         boolean mTurnOffWindowResizeAnim;
   18771 
   18772         /**
   18773          * Left position of this view's window
   18774          */
   18775         int mWindowLeft;
   18776 
   18777         /**
   18778          * Top position of this view's window
   18779          */
   18780         int mWindowTop;
   18781 
   18782         /**
   18783          * Indicates whether views need to use 32-bit drawing caches
   18784          */
   18785         boolean mUse32BitDrawingCache;
   18786 
   18787         /**
   18788          * For windows that are full-screen but using insets to layout inside
   18789          * of the screen areas, these are the current insets to appear inside
   18790          * the overscan area of the display.
   18791          */
   18792         final Rect mOverscanInsets = new Rect();
   18793 
   18794         /**
   18795          * For windows that are full-screen but using insets to layout inside
   18796          * of the screen decorations, these are the current insets for the
   18797          * content of the window.
   18798          */
   18799         final Rect mContentInsets = new Rect();
   18800 
   18801         /**
   18802          * For windows that are full-screen but using insets to layout inside
   18803          * of the screen decorations, these are the current insets for the
   18804          * actual visible parts of the window.
   18805          */
   18806         final Rect mVisibleInsets = new Rect();
   18807 
   18808         /**
   18809          * The internal insets given by this window.  This value is
   18810          * supplied by the client (through
   18811          * {@link ViewTreeObserver.OnComputeInternalInsetsListener}) and will
   18812          * be given to the window manager when changed to be used in laying
   18813          * out windows behind it.
   18814          */
   18815         final ViewTreeObserver.InternalInsetsInfo mGivenInternalInsets
   18816                 = new ViewTreeObserver.InternalInsetsInfo();
   18817 
   18818         /**
   18819          * Set to true when mGivenInternalInsets is non-empty.
   18820          */
   18821         boolean mHasNonEmptyGivenInternalInsets;
   18822 
   18823         /**
   18824          * All views in the window's hierarchy that serve as scroll containers,
   18825          * used to determine if the window can be resized or must be panned
   18826          * to adjust for a soft input area.
   18827          */
   18828         final ArrayList<View> mScrollContainers = new ArrayList<View>();
   18829 
   18830         final KeyEvent.DispatcherState mKeyDispatchState
   18831                 = new KeyEvent.DispatcherState();
   18832 
   18833         /**
   18834          * Indicates whether the view's window currently has the focus.
   18835          */
   18836         boolean mHasWindowFocus;
   18837 
   18838         /**
   18839          * The current visibility of the window.
   18840          */
   18841         int mWindowVisibility;
   18842 
   18843         /**
   18844          * Indicates the time at which drawing started to occur.
   18845          */
   18846         long mDrawingTime;
   18847 
   18848         /**
   18849          * Indicates whether or not ignoring the DIRTY_MASK flags.
   18850          */
   18851         boolean mIgnoreDirtyState;
   18852 
   18853         /**
   18854          * This flag tracks when the mIgnoreDirtyState flag is set during draw(),
   18855          * to avoid clearing that flag prematurely.
   18856          */
   18857         boolean mSetIgnoreDirtyState = false;
   18858 
   18859         /**
   18860          * Indicates whether the view's window is currently in touch mode.
   18861          */
   18862         boolean mInTouchMode;
   18863 
   18864         /**
   18865          * Indicates that ViewAncestor should trigger a global layout change
   18866          * the next time it performs a traversal
   18867          */
   18868         boolean mRecomputeGlobalAttributes;
   18869 
   18870         /**
   18871          * Always report new attributes at next traversal.
   18872          */
   18873         boolean mForceReportNewAttributes;
   18874 
   18875         /**
   18876          * Set during a traveral if any views want to keep the screen on.
   18877          */
   18878         boolean mKeepScreenOn;
   18879 
   18880         /**
   18881          * Bitwise-or of all of the values that views have passed to setSystemUiVisibility().
   18882          */
   18883         int mSystemUiVisibility;
   18884 
   18885         /**
   18886          * Hack to force certain system UI visibility flags to be cleared.
   18887          */
   18888         int mDisabledSystemUiVisibility;
   18889 
   18890         /**
   18891          * Last global system UI visibility reported by the window manager.
   18892          */
   18893         int mGlobalSystemUiVisibility;
   18894 
   18895         /**
   18896          * True if a view in this hierarchy has an OnSystemUiVisibilityChangeListener
   18897          * attached.
   18898          */
   18899         boolean mHasSystemUiListeners;
   18900 
   18901         /**
   18902          * Set if the window has requested to extend into the overscan region
   18903          * via WindowManager.LayoutParams.FLAG_LAYOUT_IN_OVERSCAN.
   18904          */
   18905         boolean mOverscanRequested;
   18906 
   18907         /**
   18908          * Set if the visibility of any views has changed.
   18909          */
   18910         boolean mViewVisibilityChanged;
   18911 
   18912         /**
   18913          * Set to true if a view has been scrolled.
   18914          */
   18915         boolean mViewScrollChanged;
   18916 
   18917         /**
   18918          * Global to the view hierarchy used as a temporary for dealing with
   18919          * x/y points in the transparent region computations.
   18920          */
   18921         final int[] mTransparentLocation = new int[2];
   18922 
   18923         /**
   18924          * Global to the view hierarchy used as a temporary for dealing with
   18925          * x/y points in the ViewGroup.invalidateChild implementation.
   18926          */
   18927         final int[] mInvalidateChildLocation = new int[2];
   18928 
   18929 
   18930         /**
   18931          * Global to the view hierarchy used as a temporary for dealing with
   18932          * x/y location when view is transformed.
   18933          */
   18934         final float[] mTmpTransformLocation = new float[2];
   18935 
   18936         /**
   18937          * The view tree observer used to dispatch global events like
   18938          * layout, pre-draw, touch mode change, etc.
   18939          */
   18940         final ViewTreeObserver mTreeObserver = new ViewTreeObserver();
   18941 
   18942         /**
   18943          * A Canvas used by the view hierarchy to perform bitmap caching.
   18944          */
   18945         Canvas mCanvas;
   18946 
   18947         /**
   18948          * The view root impl.
   18949          */
   18950         final ViewRootImpl mViewRootImpl;
   18951 
   18952         /**
   18953          * A Handler supplied by a view's {@link android.view.ViewRootImpl}. This
   18954          * handler can be used to pump events in the UI events queue.
   18955          */
   18956         final Handler mHandler;
   18957 
   18958         /**
   18959          * Temporary for use in computing invalidate rectangles while
   18960          * calling up the hierarchy.
   18961          */
   18962         final Rect mTmpInvalRect = new Rect();
   18963 
   18964         /**
   18965          * Temporary for use in computing hit areas with transformed views
   18966          */
   18967         final RectF mTmpTransformRect = new RectF();
   18968 
   18969         /**
   18970          * Temporary for use in transforming invalidation rect
   18971          */
   18972         final Matrix mTmpMatrix = new Matrix();
   18973 
   18974         /**
   18975          * Temporary for use in transforming invalidation rect
   18976          */
   18977         final Transformation mTmpTransformation = new Transformation();
   18978 
   18979         /**
   18980          * Temporary list for use in collecting focusable descendents of a view.
   18981          */
   18982         final ArrayList<View> mTempArrayList = new ArrayList<View>(24);
   18983 
   18984         /**
   18985          * The id of the window for accessibility purposes.
   18986          */
   18987         int mAccessibilityWindowId = View.NO_ID;
   18988 
   18989         /**
   18990          * Flags related to accessibility processing.
   18991          *
   18992          * @see AccessibilityNodeInfo#FLAG_INCLUDE_NOT_IMPORTANT_VIEWS
   18993          * @see AccessibilityNodeInfo#FLAG_REPORT_VIEW_IDS
   18994          */
   18995         int mAccessibilityFetchFlags;
   18996 
   18997         /**
   18998          * The drawable for highlighting accessibility focus.
   18999          */
   19000         Drawable mAccessibilityFocusDrawable;
   19001 
   19002         /**
   19003          * Show where the margins, bounds and layout bounds are for each view.
   19004          */
   19005         boolean mDebugLayout = SystemProperties.getBoolean(DEBUG_LAYOUT_PROPERTY, false);
   19006 
   19007         /**
   19008          * Point used to compute visible regions.
   19009          */
   19010         final Point mPoint = new Point();
   19011 
   19012         /**
   19013          * Used to track which View originated a requestLayout() call, used when
   19014          * requestLayout() is called during layout.
   19015          */
   19016         View mViewRequestingLayout;
   19017 
   19018         /**
   19019          * Creates a new set of attachment information with the specified
   19020          * events handler and thread.
   19021          *
   19022          * @param handler the events handler the view must use
   19023          */
   19024         AttachInfo(IWindowSession session, IWindow window, Display display,
   19025                 ViewRootImpl viewRootImpl, Handler handler, Callbacks effectPlayer) {
   19026             mSession = session;
   19027             mWindow = window;
   19028             mWindowToken = window.asBinder();
   19029             mDisplay = display;
   19030             mViewRootImpl = viewRootImpl;
   19031             mHandler = handler;
   19032             mRootCallbacks = effectPlayer;
   19033         }
   19034     }
   19035 
   19036     /**
   19037      * <p>ScrollabilityCache holds various fields used by a View when scrolling
   19038      * is supported. This avoids keeping too many unused fields in most
   19039      * instances of View.</p>
   19040      */
   19041     private static class ScrollabilityCache implements Runnable {
   19042 
   19043         /**
   19044          * Scrollbars are not visible
   19045          */
   19046         public static final int OFF = 0;
   19047 
   19048         /**
   19049          * Scrollbars are visible
   19050          */
   19051         public static final int ON = 1;
   19052 
   19053         /**
   19054          * Scrollbars are fading away
   19055          */
   19056         public static final int FADING = 2;
   19057 
   19058         public boolean fadeScrollBars;
   19059 
   19060         public int fadingEdgeLength;
   19061         public int scrollBarDefaultDelayBeforeFade;
   19062         public int scrollBarFadeDuration;
   19063 
   19064         public int scrollBarSize;
   19065         public ScrollBarDrawable scrollBar;
   19066         public float[] interpolatorValues;
   19067         public View host;
   19068 
   19069         public final Paint paint;
   19070         public final Matrix matrix;
   19071         public Shader shader;
   19072 
   19073         public final Interpolator scrollBarInterpolator = new Interpolator(1, 2);
   19074 
   19075         private static final float[] OPAQUE = { 255 };
   19076         private static final float[] TRANSPARENT = { 0.0f };
   19077 
   19078         /**
   19079          * When fading should start. This time moves into the future every time
   19080          * a new scroll happens. Measured based on SystemClock.uptimeMillis()
   19081          */
   19082         public long fadeStartTime;
   19083 
   19084 
   19085         /**
   19086          * The current state of the scrollbars: ON, OFF, or FADING
   19087          */
   19088         public int state = OFF;
   19089 
   19090         private int mLastColor;
   19091 
   19092         public ScrollabilityCache(ViewConfiguration configuration, View host) {
   19093             fadingEdgeLength = configuration.getScaledFadingEdgeLength();
   19094             scrollBarSize = configuration.getScaledScrollBarSize();
   19095             scrollBarDefaultDelayBeforeFade = ViewConfiguration.getScrollDefaultDelay();
   19096             scrollBarFadeDuration = ViewConfiguration.getScrollBarFadeDuration();
   19097 
   19098             paint = new Paint();
   19099             matrix = new Matrix();
   19100             // use use a height of 1, and then wack the matrix each time we
   19101             // actually use it.
   19102             shader = new LinearGradient(0, 0, 0, 1, 0xFF000000, 0, Shader.TileMode.CLAMP);
   19103             paint.setShader(shader);
   19104             paint.setXfermode(new PorterDuffXfermode(PorterDuff.Mode.DST_OUT));
   19105 
   19106             this.host = host;
   19107         }
   19108 
   19109         public void setFadeColor(int color) {
   19110             if (color != mLastColor) {
   19111                 mLastColor = color;
   19112 
   19113                 if (color != 0) {
   19114                     shader = new LinearGradient(0, 0, 0, 1, color | 0xFF000000,
   19115                             color & 0x00FFFFFF, Shader.TileMode.CLAMP);
   19116                     paint.setShader(shader);
   19117                     // Restore the default transfer mode (src_over)
   19118                     paint.setXfermode(null);
   19119                 } else {
   19120                     shader = new LinearGradient(0, 0, 0, 1, 0xFF000000, 0, Shader.TileMode.CLAMP);
   19121                     paint.setShader(shader);
   19122                     paint.setXfermode(new PorterDuffXfermode(PorterDuff.Mode.DST_OUT));
   19123                 }
   19124             }
   19125         }
   19126 
   19127         public void run() {
   19128             long now = AnimationUtils.currentAnimationTimeMillis();
   19129             if (now >= fadeStartTime) {
   19130 
   19131                 // the animation fades the scrollbars out by changing
   19132                 // the opacity (alpha) from fully opaque to fully
   19133                 // transparent
   19134                 int nextFrame = (int) now;
   19135                 int framesCount = 0;
   19136 
   19137                 Interpolator interpolator = scrollBarInterpolator;
   19138 
   19139                 // Start opaque
   19140                 interpolator.setKeyFrame(framesCount++, nextFrame, OPAQUE);
   19141 
   19142                 // End transparent
   19143                 nextFrame += scrollBarFadeDuration;
   19144                 interpolator.setKeyFrame(framesCount, nextFrame, TRANSPARENT);
   19145 
   19146                 state = FADING;
   19147 
   19148                 // Kick off the fade animation
   19149                 host.invalidate(true);
   19150             }
   19151         }
   19152     }
   19153 
   19154     /**
   19155      * Resuable callback for sending
   19156      * {@link AccessibilityEvent#TYPE_VIEW_SCROLLED} accessibility event.
   19157      */
   19158     private class SendViewScrolledAccessibilityEvent implements Runnable {
   19159         public volatile boolean mIsPending;
   19160 
   19161         public void run() {
   19162             sendAccessibilityEvent(AccessibilityEvent.TYPE_VIEW_SCROLLED);
   19163             mIsPending = false;
   19164         }
   19165     }
   19166 
   19167     /**
   19168      * <p>
   19169      * This class represents a delegate that can be registered in a {@link View}
   19170      * to enhance accessibility support via composition rather via inheritance.
   19171      * It is specifically targeted to widget developers that extend basic View
   19172      * classes i.e. classes in package android.view, that would like their
   19173      * applications to be backwards compatible.
   19174      * </p>
   19175      * <div class="special reference">
   19176      * <h3>Developer Guides</h3>
   19177      * <p>For more information about making applications accessible, read the
   19178      * <a href="{@docRoot}guide/topics/ui/accessibility/index.html">Accessibility</a>
   19179      * developer guide.</p>
   19180      * </div>
   19181      * <p>
   19182      * A scenario in which a developer would like to use an accessibility delegate
   19183      * is overriding a method introduced in a later API version then the minimal API
   19184      * version supported by the application. For example, the method
   19185      * {@link View#onInitializeAccessibilityNodeInfo(AccessibilityNodeInfo)} is not available
   19186      * in API version 4 when the accessibility APIs were first introduced. If a
   19187      * developer would like his application to run on API version 4 devices (assuming
   19188      * all other APIs used by the application are version 4 or lower) and take advantage
   19189      * of this method, instead of overriding the method which would break the application's
   19190      * backwards compatibility, he can override the corresponding method in this
   19191      * delegate and register the delegate in the target View if the API version of
   19192      * the system is high enough i.e. the API version is same or higher to the API
   19193      * version that introduced
   19194      * {@link View#onInitializeAccessibilityNodeInfo(AccessibilityNodeInfo)}.
   19195      * </p>
   19196      * <p>
   19197      * Here is an example implementation:
   19198      * </p>
   19199      * <code><pre><p>
   19200      * if (Build.VERSION.SDK_INT >= 14) {
   19201      *     // If the API version is equal of higher than the version in
   19202      *     // which onInitializeAccessibilityNodeInfo was introduced we
   19203      *     // register a delegate with a customized implementation.
   19204      *     View view = findViewById(R.id.view_id);
   19205      *     view.setAccessibilityDelegate(new AccessibilityDelegate() {
   19206      *         public void onInitializeAccessibilityNodeInfo(View host,
   19207      *                 AccessibilityNodeInfo info) {
   19208      *             // Let the default implementation populate the info.
   19209      *             super.onInitializeAccessibilityNodeInfo(host, info);
   19210      *             // Set some other information.
   19211      *             info.setEnabled(host.isEnabled());
   19212      *         }
   19213      *     });
   19214      * }
   19215      * </code></pre></p>
   19216      * <p>
   19217      * This delegate contains methods that correspond to the accessibility methods
   19218      * in View. If a delegate has been specified the implementation in View hands
   19219      * off handling to the corresponding method in this delegate. The default
   19220      * implementation the delegate methods behaves exactly as the corresponding
   19221      * method in View for the case of no accessibility delegate been set. Hence,
   19222      * to customize the behavior of a View method, clients can override only the
   19223      * corresponding delegate method without altering the behavior of the rest
   19224      * accessibility related methods of the host view.
   19225      * </p>
   19226      */
   19227     public static class AccessibilityDelegate {
   19228 
   19229         /**
   19230          * Sends an accessibility event of the given type. If accessibility is not
   19231          * enabled this method has no effect.
   19232          * <p>
   19233          * The default implementation behaves as {@link View#sendAccessibilityEvent(int)
   19234          *  View#sendAccessibilityEvent(int)} for the case of no accessibility delegate
   19235          * been set.
   19236          * </p>
   19237          *
   19238          * @param host The View hosting the delegate.
   19239          * @param eventType The type of the event to send.
   19240          *
   19241          * @see View#sendAccessibilityEvent(int) View#sendAccessibilityEvent(int)
   19242          */
   19243         public void sendAccessibilityEvent(View host, int eventType) {
   19244             host.sendAccessibilityEventInternal(eventType);
   19245         }
   19246 
   19247         /**
   19248          * Performs the specified accessibility action on the view. For
   19249          * possible accessibility actions look at {@link AccessibilityNodeInfo}.
   19250          * <p>
   19251          * The default implementation behaves as
   19252          * {@link View#performAccessibilityAction(int, Bundle)
   19253          *  View#performAccessibilityAction(int, Bundle)} for the case of
   19254          *  no accessibility delegate been set.
   19255          * </p>
   19256          *
   19257          * @param action The action to perform.
   19258          * @return Whether the action was performed.
   19259          *
   19260          * @see View#performAccessibilityAction(int, Bundle)
   19261          *      View#performAccessibilityAction(int, Bundle)
   19262          */
   19263         public boolean performAccessibilityAction(View host, int action, Bundle args) {
   19264             return host.performAccessibilityActionInternal(action, args);
   19265         }
   19266 
   19267         /**
   19268          * Sends an accessibility event. This method behaves exactly as
   19269          * {@link #sendAccessibilityEvent(View, int)} but takes as an argument an
   19270          * empty {@link AccessibilityEvent} and does not perform a check whether
   19271          * accessibility is enabled.
   19272          * <p>
   19273          * The default implementation behaves as
   19274          * {@link View#sendAccessibilityEventUnchecked(AccessibilityEvent)
   19275          *  View#sendAccessibilityEventUnchecked(AccessibilityEvent)} for
   19276          * the case of no accessibility delegate been set.
   19277          * </p>
   19278          *
   19279          * @param host The View hosting the delegate.
   19280          * @param event The event to send.
   19281          *
   19282          * @see View#sendAccessibilityEventUnchecked(AccessibilityEvent)
   19283          *      View#sendAccessibilityEventUnchecked(AccessibilityEvent)
   19284          */
   19285         public void sendAccessibilityEventUnchecked(View host, AccessibilityEvent event) {
   19286             host.sendAccessibilityEventUncheckedInternal(event);
   19287         }
   19288 
   19289         /**
   19290          * Dispatches an {@link AccessibilityEvent} to the host {@link View} first and then
   19291          * to its children for adding their text content to the event.
   19292          * <p>
   19293          * The default implementation behaves as
   19294          * {@link View#dispatchPopulateAccessibilityEvent(AccessibilityEvent)
   19295          *  View#dispatchPopulateAccessibilityEvent(AccessibilityEvent)} for
   19296          * the case of no accessibility delegate been set.
   19297          * </p>
   19298          *
   19299          * @param host The View hosting the delegate.
   19300          * @param event The event.
   19301          * @return True if the event population was completed.
   19302          *
   19303          * @see View#dispatchPopulateAccessibilityEvent(AccessibilityEvent)
   19304          *      View#dispatchPopulateAccessibilityEvent(AccessibilityEvent)
   19305          */
   19306         public boolean dispatchPopulateAccessibilityEvent(View host, AccessibilityEvent event) {
   19307             return host.dispatchPopulateAccessibilityEventInternal(event);
   19308         }
   19309 
   19310         /**
   19311          * Gives a chance to the host View to populate the accessibility event with its
   19312          * text content.
   19313          * <p>
   19314          * The default implementation behaves as
   19315          * {@link View#onPopulateAccessibilityEvent(AccessibilityEvent)
   19316          *  View#onPopulateAccessibilityEvent(AccessibilityEvent)} for
   19317          * the case of no accessibility delegate been set.
   19318          * </p>
   19319          *
   19320          * @param host The View hosting the delegate.
   19321          * @param event The accessibility event which to populate.
   19322          *
   19323          * @see View#onPopulateAccessibilityEvent(AccessibilityEvent)
   19324          *      View#onPopulateAccessibilityEvent(AccessibilityEvent)
   19325          */
   19326         public void onPopulateAccessibilityEvent(View host, AccessibilityEvent event) {
   19327             host.onPopulateAccessibilityEventInternal(event);
   19328         }
   19329 
   19330         /**
   19331          * Initializes an {@link AccessibilityEvent} with information about the
   19332          * the host View which is the event source.
   19333          * <p>
   19334          * The default implementation behaves as
   19335          * {@link View#onInitializeAccessibilityEvent(AccessibilityEvent)
   19336          *  View#onInitializeAccessibilityEvent(AccessibilityEvent)} for
   19337          * the case of no accessibility delegate been set.
   19338          * </p>
   19339          *
   19340          * @param host The View hosting the delegate.
   19341          * @param event The event to initialize.
   19342          *
   19343          * @see View#onInitializeAccessibilityEvent(AccessibilityEvent)
   19344          *      View#onInitializeAccessibilityEvent(AccessibilityEvent)
   19345          */
   19346         public void onInitializeAccessibilityEvent(View host, AccessibilityEvent event) {
   19347             host.onInitializeAccessibilityEventInternal(event);
   19348         }
   19349 
   19350         /**
   19351          * Initializes an {@link AccessibilityNodeInfo} with information about the host view.
   19352          * <p>
   19353          * The default implementation behaves as
   19354          * {@link View#onInitializeAccessibilityNodeInfo(AccessibilityNodeInfo)
   19355          *  View#onInitializeAccessibilityNodeInfo(AccessibilityNodeInfo)} for
   19356          * the case of no accessibility delegate been set.
   19357          * </p>
   19358          *
   19359          * @param host The View hosting the delegate.
   19360          * @param info The instance to initialize.
   19361          *
   19362          * @see View#onInitializeAccessibilityNodeInfo(AccessibilityNodeInfo)
   19363          *      View#onInitializeAccessibilityNodeInfo(AccessibilityNodeInfo)
   19364          */
   19365         public void onInitializeAccessibilityNodeInfo(View host, AccessibilityNodeInfo info) {
   19366             host.onInitializeAccessibilityNodeInfoInternal(info);
   19367         }
   19368 
   19369         /**
   19370          * Called when a child of the host View has requested sending an
   19371          * {@link AccessibilityEvent} and gives an opportunity to the parent (the host)
   19372          * to augment the event.
   19373          * <p>
   19374          * The default implementation behaves as
   19375          * {@link ViewGroup#onRequestSendAccessibilityEvent(View, AccessibilityEvent)
   19376          *  ViewGroup#onRequestSendAccessibilityEvent(View, AccessibilityEvent)} for
   19377          * the case of no accessibility delegate been set.
   19378          * </p>
   19379          *
   19380          * @param host The View hosting the delegate.
   19381          * @param child The child which requests sending the event.
   19382          * @param event The event to be sent.
   19383          * @return True if the event should be sent
   19384          *
   19385          * @see ViewGroup#onRequestSendAccessibilityEvent(View, AccessibilityEvent)
   19386          *      ViewGroup#onRequestSendAccessibilityEvent(View, AccessibilityEvent)
   19387          */
   19388         public boolean onRequestSendAccessibilityEvent(ViewGroup host, View child,
   19389                 AccessibilityEvent event) {
   19390             return host.onRequestSendAccessibilityEventInternal(child, event);
   19391         }
   19392 
   19393         /**
   19394          * Gets the provider for managing a virtual view hierarchy rooted at this View
   19395          * and reported to {@link android.accessibilityservice.AccessibilityService}s
   19396          * that explore the window content.
   19397          * <p>
   19398          * The default implementation behaves as
   19399          * {@link View#getAccessibilityNodeProvider() View#getAccessibilityNodeProvider()} for
   19400          * the case of no accessibility delegate been set.
   19401          * </p>
   19402          *
   19403          * @return The provider.
   19404          *
   19405          * @see AccessibilityNodeProvider
   19406          */
   19407         public AccessibilityNodeProvider getAccessibilityNodeProvider(View host) {
   19408             return null;
   19409         }
   19410 
   19411         /**
   19412          * Returns an {@link AccessibilityNodeInfo} representing the host view from the
   19413          * point of view of an {@link android.accessibilityservice.AccessibilityService}.
   19414          * This method is responsible for obtaining an accessibility node info from a
   19415          * pool of reusable instances and calling
   19416          * {@link #onInitializeAccessibilityNodeInfo(AccessibilityNodeInfo)} on the host
   19417          * view to initialize the former.
   19418          * <p>
   19419          * <strong>Note:</strong> The client is responsible for recycling the obtained
   19420          * instance by calling {@link AccessibilityNodeInfo#recycle()} to minimize object
   19421          * creation.
   19422          * </p>
   19423          * <p>
   19424          * The default implementation behaves as
   19425          * {@link View#createAccessibilityNodeInfo() View#createAccessibilityNodeInfo()} for
   19426          * the case of no accessibility delegate been set.
   19427          * </p>
   19428          * @return A populated {@link AccessibilityNodeInfo}.
   19429          *
   19430          * @see AccessibilityNodeInfo
   19431          *
   19432          * @hide
   19433          */
   19434         public AccessibilityNodeInfo createAccessibilityNodeInfo(View host) {
   19435             return host.createAccessibilityNodeInfoInternal();
   19436         }
   19437     }
   19438 
   19439     private class MatchIdPredicate implements Predicate<View> {
   19440         public int mId;
   19441 
   19442         @Override
   19443         public boolean apply(View view) {
   19444             return (view.mID == mId);
   19445         }
   19446     }
   19447 
   19448     private class MatchLabelForPredicate implements Predicate<View> {
   19449         private int mLabeledId;
   19450 
   19451         @Override
   19452         public boolean apply(View view) {
   19453             return (view.mLabelForId == mLabeledId);
   19454         }
   19455     }
   19456 
   19457     private class SendViewStateChangedAccessibilityEvent implements Runnable {
   19458         private int mChangeTypes = 0;
   19459         private boolean mPosted;
   19460         private boolean mPostedWithDelay;
   19461         private long mLastEventTimeMillis;
   19462 
   19463         @Override
   19464         public void run() {
   19465             mPosted = false;
   19466             mPostedWithDelay = false;
   19467             mLastEventTimeMillis = SystemClock.uptimeMillis();
   19468             if (AccessibilityManager.getInstance(mContext).isEnabled()) {
   19469                 final AccessibilityEvent event = AccessibilityEvent.obtain();
   19470                 event.setEventType(AccessibilityEvent.TYPE_WINDOW_CONTENT_CHANGED);
   19471                 event.setContentChangeTypes(mChangeTypes);
   19472                 sendAccessibilityEventUnchecked(event);
   19473             }
   19474             mChangeTypes = 0;
   19475         }
   19476 
   19477         public void runOrPost(int changeType) {
   19478             mChangeTypes |= changeType;
   19479 
   19480             // If this is a live region or the child of a live region, collect
   19481             // all events from this frame and send them on the next frame.
   19482             if (inLiveRegion()) {
   19483                 // If we're already posted with a delay, remove that.
   19484                 if (mPostedWithDelay) {
   19485                     removeCallbacks(this);
   19486                     mPostedWithDelay = false;
   19487                 }
   19488                 // Only post if we're not already posted.
   19489                 if (!mPosted) {
   19490                     post(this);
   19491                     mPosted = true;
   19492                 }
   19493                 return;
   19494             }
   19495 
   19496             if (mPosted) {
   19497                 return;
   19498             }
   19499             final long timeSinceLastMillis = SystemClock.uptimeMillis() - mLastEventTimeMillis;
   19500             final long minEventIntevalMillis =
   19501                     ViewConfiguration.getSendRecurringAccessibilityEventsInterval();
   19502             if (timeSinceLastMillis >= minEventIntevalMillis) {
   19503                 removeCallbacks(this);
   19504                 run();
   19505             } else {
   19506                 postDelayed(this, minEventIntevalMillis - timeSinceLastMillis);
   19507                 mPosted = true;
   19508                 mPostedWithDelay = true;
   19509             }
   19510         }
   19511     }
   19512 
   19513     private boolean inLiveRegion() {
   19514         if (getAccessibilityLiveRegion() != View.ACCESSIBILITY_LIVE_REGION_NONE) {
   19515             return true;
   19516         }
   19517 
   19518         ViewParent parent = getParent();
   19519         while (parent instanceof View) {
   19520             if (((View) parent).getAccessibilityLiveRegion()
   19521                     != View.ACCESSIBILITY_LIVE_REGION_NONE) {
   19522                 return true;
   19523             }
   19524             parent = parent.getParent();
   19525         }
   19526 
   19527         return false;
   19528     }
   19529 
   19530     /**
   19531      * Dump all private flags in readable format, useful for documentation and
   19532      * sanity checking.
   19533      */
   19534     private static void dumpFlags() {
   19535         final HashMap<String, String> found = Maps.newHashMap();
   19536         try {
   19537             for (Field field : View.class.getDeclaredFields()) {
   19538                 final int modifiers = field.getModifiers();
   19539                 if (Modifier.isStatic(modifiers) && Modifier.isFinal(modifiers)) {
   19540                     if (field.getType().equals(int.class)) {
   19541                         final int value = field.getInt(null);
   19542                         dumpFlag(found, field.getName(), value);
   19543                     } else if (field.getType().equals(int[].class)) {
   19544                         final int[] values = (int[]) field.get(null);
   19545                         for (int i = 0; i < values.length; i++) {
   19546                             dumpFlag(found, field.getName() + "[" + i + "]", values[i]);
   19547                         }
   19548                     }
   19549                 }
   19550             }
   19551         } catch (IllegalAccessException e) {
   19552             throw new RuntimeException(e);
   19553         }
   19554 
   19555         final ArrayList<String> keys = Lists.newArrayList();
   19556         keys.addAll(found.keySet());
   19557         Collections.sort(keys);
   19558         for (String key : keys) {
   19559             Log.d(VIEW_LOG_TAG, found.get(key));
   19560         }
   19561     }
   19562 
   19563     private static void dumpFlag(HashMap<String, String> found, String name, int value) {
   19564         // Sort flags by prefix, then by bits, always keeping unique keys
   19565         final String bits = String.format("%32s", Integer.toBinaryString(value)).replace('0', ' ');
   19566         final int prefix = name.indexOf('_');
   19567         final String key = (prefix > 0 ? name.substring(0, prefix) : name) + bits + name;
   19568         final String output = bits + " " + name;
   19569         found.put(key, output);
   19570     }
   19571 }
   19572