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.Build; 44 import android.os.Bundle; 45 import android.os.Handler; 46 import android.os.IBinder; 47 import android.os.Parcel; 48 import android.os.Parcelable; 49 import android.os.RemoteException; 50 import android.os.SystemClock; 51 import android.os.SystemProperties; 52 import android.text.TextUtils; 53 import android.util.AttributeSet; 54 import android.util.FloatProperty; 55 import android.util.Log; 56 import android.util.Pools.SynchronizedPool; 57 import android.util.Property; 58 import android.util.SparseArray; 59 import android.util.TypedValue; 60 import android.view.ContextMenu.ContextMenuInfo; 61 import android.view.AccessibilityIterators.TextSegmentIterator; 62 import android.view.AccessibilityIterators.CharacterTextSegmentIterator; 63 import android.view.AccessibilityIterators.WordTextSegmentIterator; 64 import android.view.AccessibilityIterators.ParagraphTextSegmentIterator; 65 import android.view.accessibility.AccessibilityEvent; 66 import android.view.accessibility.AccessibilityEventSource; 67 import android.view.accessibility.AccessibilityManager; 68 import android.view.accessibility.AccessibilityNodeInfo; 69 import android.view.accessibility.AccessibilityNodeProvider; 70 import android.view.animation.Animation; 71 import android.view.animation.AnimationUtils; 72 import android.view.animation.Transformation; 73 import android.view.inputmethod.EditorInfo; 74 import android.view.inputmethod.InputConnection; 75 import android.view.inputmethod.InputMethodManager; 76 import android.widget.ScrollBarDrawable; 77 78 import static android.os.Build.VERSION_CODES.*; 79 import static java.lang.Math.max; 80 81 import com.android.internal.R; 82 import com.android.internal.util.Predicate; 83 import com.android.internal.view.menu.MenuBuilder; 84 import com.google.android.collect.Lists; 85 import com.google.android.collect.Maps; 86 87 import java.lang.ref.WeakReference; 88 import java.lang.reflect.Field; 89 import java.lang.reflect.InvocationTargetException; 90 import java.lang.reflect.Method; 91 import java.lang.reflect.Modifier; 92 import java.util.ArrayList; 93 import java.util.Arrays; 94 import java.util.Collections; 95 import java.util.HashMap; 96 import java.util.Locale; 97 import java.util.concurrent.CopyOnWriteArrayList; 98 import java.util.concurrent.atomic.AtomicInteger; 99 100 /** 101 * <p> 102 * This class represents the basic building block for user interface components. A View 103 * occupies a rectangular area on the screen and is responsible for drawing and 104 * event handling. View is the base class for <em>widgets</em>, which are 105 * used to create interactive UI components (buttons, text fields, etc.). The 106 * {@link android.view.ViewGroup} subclass is the base class for <em>layouts</em>, which 107 * are invisible containers that hold other Views (or other ViewGroups) and define 108 * their layout properties. 109 * </p> 110 * 111 * <div class="special reference"> 112 * <h3>Developer Guides</h3> 113 * <p>For information about using this class to develop your application's user interface, 114 * read the <a href="{@docRoot}guide/topics/ui/index.html">User Interface</a> developer guide. 115 * </div> 116 * 117 * <a name="Using"></a> 118 * <h3>Using Views</h3> 119 * <p> 120 * All of the views in a window are arranged in a single tree. You can add views 121 * either from code or by specifying a tree of views in one or more XML layout 122 * files. There are many specialized subclasses of views that act as controls or 123 * are capable of displaying text, images, or other content. 124 * </p> 125 * <p> 126 * Once you have created a tree of views, there are typically a few types of 127 * common operations you may wish to perform: 128 * <ul> 129 * <li><strong>Set properties:</strong> for example setting the text of a 130 * {@link android.widget.TextView}. The available properties and the methods 131 * that set them will vary among the different subclasses of views. Note that 132 * properties that are known at build time can be set in the XML layout 133 * files.</li> 134 * <li><strong>Set focus:</strong> The framework will handled moving focus in 135 * response to user input. To force focus to a specific view, call 136 * {@link #requestFocus}.</li> 137 * <li><strong>Set up listeners:</strong> Views allow clients to set listeners 138 * that will be notified when something interesting happens to the view. For 139 * example, all views will let you set a listener to be notified when the view 140 * gains or loses focus. You can register such a listener using 141 * {@link #setOnFocusChangeListener(android.view.View.OnFocusChangeListener)}. 142 * Other view subclasses offer more specialized listeners. For example, a Button 143 * exposes a listener to notify clients when the button is clicked.</li> 144 * <li><strong>Set visibility:</strong> You can hide or show views using 145 * {@link #setVisibility(int)}.</li> 146 * </ul> 147 * </p> 148 * <p><em> 149 * Note: The Android framework is responsible for measuring, laying out and 150 * drawing views. You should not call methods that perform these actions on 151 * views yourself unless you are actually implementing a 152 * {@link android.view.ViewGroup}. 153 * </em></p> 154 * 155 * <a name="Lifecycle"></a> 156 * <h3>Implementing a Custom View</h3> 157 * 158 * <p> 159 * To implement a custom view, you will usually begin by providing overrides for 160 * some of the standard methods that the framework calls on all views. You do 161 * not need to override all of these methods. In fact, you can start by just 162 * overriding {@link #onDraw(android.graphics.Canvas)}. 163 * <table border="2" width="85%" align="center" cellpadding="5"> 164 * <thead> 165 * <tr><th>Category</th> <th>Methods</th> <th>Description</th></tr> 166 * </thead> 167 * 168 * <tbody> 169 * <tr> 170 * <td rowspan="2">Creation</td> 171 * <td>Constructors</td> 172 * <td>There is a form of the constructor that are called when the view 173 * is created from code and a form that is called when the view is 174 * inflated from a layout file. The second form should parse and apply 175 * any attributes defined in the layout file. 176 * </td> 177 * </tr> 178 * <tr> 179 * <td><code>{@link #onFinishInflate()}</code></td> 180 * <td>Called after a view and all of its children has been inflated 181 * from XML.</td> 182 * </tr> 183 * 184 * <tr> 185 * <td rowspan="3">Layout</td> 186 * <td><code>{@link #onMeasure(int, int)}</code></td> 187 * <td>Called to determine the size requirements for this view and all 188 * of its children. 189 * </td> 190 * </tr> 191 * <tr> 192 * <td><code>{@link #onLayout(boolean, int, int, int, int)}</code></td> 193 * <td>Called when this view should assign a size and position to all 194 * of its children. 195 * </td> 196 * </tr> 197 * <tr> 198 * <td><code>{@link #onSizeChanged(int, int, int, int)}</code></td> 199 * <td>Called when the size of this view has changed. 200 * </td> 201 * </tr> 202 * 203 * <tr> 204 * <td>Drawing</td> 205 * <td><code>{@link #onDraw(android.graphics.Canvas)}</code></td> 206 * <td>Called when the view should render its content. 207 * </td> 208 * </tr> 209 * 210 * <tr> 211 * <td rowspan="4">Event processing</td> 212 * <td><code>{@link #onKeyDown(int, KeyEvent)}</code></td> 213 * <td>Called when a new hardware key event occurs. 214 * </td> 215 * </tr> 216 * <tr> 217 * <td><code>{@link #onKeyUp(int, KeyEvent)}</code></td> 218 * <td>Called when a hardware key up event occurs. 219 * </td> 220 * </tr> 221 * <tr> 222 * <td><code>{@link #onTrackballEvent(MotionEvent)}</code></td> 223 * <td>Called when a trackball motion event occurs. 224 * </td> 225 * </tr> 226 * <tr> 227 * <td><code>{@link #onTouchEvent(MotionEvent)}</code></td> 228 * <td>Called when a touch screen motion event occurs. 229 * </td> 230 * </tr> 231 * 232 * <tr> 233 * <td rowspan="2">Focus</td> 234 * <td><code>{@link #onFocusChanged(boolean, int, android.graphics.Rect)}</code></td> 235 * <td>Called when the view gains or loses focus. 236 * </td> 237 * </tr> 238 * 239 * <tr> 240 * <td><code>{@link #onWindowFocusChanged(boolean)}</code></td> 241 * <td>Called when the window containing the view gains or loses focus. 242 * </td> 243 * </tr> 244 * 245 * <tr> 246 * <td rowspan="3">Attaching</td> 247 * <td><code>{@link #onAttachedToWindow()}</code></td> 248 * <td>Called when the view is attached to a window. 249 * </td> 250 * </tr> 251 * 252 * <tr> 253 * <td><code>{@link #onDetachedFromWindow}</code></td> 254 * <td>Called when the view is detached from its window. 255 * </td> 256 * </tr> 257 * 258 * <tr> 259 * <td><code>{@link #onWindowVisibilityChanged(int)}</code></td> 260 * <td>Called when the visibility of the window containing the view 261 * has changed. 262 * </td> 263 * </tr> 264 * </tbody> 265 * 266 * </table> 267 * </p> 268 * 269 * <a name="IDs"></a> 270 * <h3>IDs</h3> 271 * Views may have an integer id associated with them. These ids are typically 272 * assigned in the layout XML files, and are used to find specific views within 273 * the view tree. A common pattern is to: 274 * <ul> 275 * <li>Define a Button in the layout file and assign it a unique ID. 276 * <pre> 277 * <Button 278 * android:id="@+id/my_button" 279 * android:layout_width="wrap_content" 280 * android:layout_height="wrap_content" 281 * android:text="@string/my_button_text"/> 282 * </pre></li> 283 * <li>From the onCreate method of an Activity, find the Button 284 * <pre class="prettyprint"> 285 * Button myButton = (Button) findViewById(R.id.my_button); 286 * </pre></li> 287 * </ul> 288 * <p> 289 * View IDs need not be unique throughout the tree, but it is good practice to 290 * ensure that they are at least unique within the part of the tree you are 291 * searching. 292 * </p> 293 * 294 * <a name="Position"></a> 295 * <h3>Position</h3> 296 * <p> 297 * The geometry of a view is that of a rectangle. A view has a location, 298 * expressed as a pair of <em>left</em> and <em>top</em> coordinates, and 299 * two dimensions, expressed as a width and a height. The unit for location 300 * and dimensions is the pixel. 301 * </p> 302 * 303 * <p> 304 * It is possible to retrieve the location of a view by invoking the methods 305 * {@link #getLeft()} and {@link #getTop()}. The former returns the left, or X, 306 * coordinate of the rectangle representing the view. The latter returns the 307 * top, or Y, coordinate of the rectangle representing the view. These methods 308 * both return the location of the view relative to its parent. For instance, 309 * when getLeft() returns 20, that means the view is located 20 pixels to the 310 * right of the left edge of its direct parent. 311 * </p> 312 * 313 * <p> 314 * In addition, several convenience methods are offered to avoid unnecessary 315 * computations, namely {@link #getRight()} and {@link #getBottom()}. 316 * These methods return the coordinates of the right and bottom edges of the 317 * rectangle representing the view. For instance, calling {@link #getRight()} 318 * is similar to the following computation: <code>getLeft() + getWidth()</code> 319 * (see <a href="#SizePaddingMargins">Size</a> for more information about the width.) 320 * </p> 321 * 322 * <a name="SizePaddingMargins"></a> 323 * <h3>Size, padding and margins</h3> 324 * <p> 325 * The size of a view is expressed with a width and a height. A view actually 326 * possess two pairs of width and height values. 327 * </p> 328 * 329 * <p> 330 * The first pair is known as <em>measured width</em> and 331 * <em>measured height</em>. These dimensions define how big a view wants to be 332 * within its parent (see <a href="#Layout">Layout</a> for more details.) The 333 * measured dimensions can be obtained by calling {@link #getMeasuredWidth()} 334 * and {@link #getMeasuredHeight()}. 335 * </p> 336 * 337 * <p> 338 * The second pair is simply known as <em>width</em> and <em>height</em>, or 339 * sometimes <em>drawing width</em> and <em>drawing height</em>. These 340 * dimensions define the actual size of the view on screen, at drawing time and 341 * after layout. These values may, but do not have to, be different from the 342 * measured width and height. The width and height can be obtained by calling 343 * {@link #getWidth()} and {@link #getHeight()}. 344 * </p> 345 * 346 * <p> 347 * To measure its dimensions, a view takes into account its padding. The padding 348 * is expressed in pixels for the left, top, right and bottom parts of the view. 349 * Padding can be used to offset the content of the view by a specific amount of 350 * pixels. For instance, a left padding of 2 will push the view's content by 351 * 2 pixels to the right of the left edge. Padding can be set using the 352 * {@link #setPadding(int, int, int, int)} or {@link #setPaddingRelative(int, int, int, int)} 353 * method and queried by calling {@link #getPaddingLeft()}, {@link #getPaddingTop()}, 354 * {@link #getPaddingRight()}, {@link #getPaddingBottom()}, {@link #getPaddingStart()}, 355 * {@link #getPaddingEnd()}. 356 * </p> 357 * 358 * <p> 359 * Even though a view can define a padding, it does not provide any support for 360 * margins. However, view groups provide such a support. Refer to 361 * {@link android.view.ViewGroup} and 362 * {@link android.view.ViewGroup.MarginLayoutParams} for further information. 363 * </p> 364 * 365 * <a name="Layout"></a> 366 * <h3>Layout</h3> 367 * <p> 368 * Layout is a two pass process: a measure pass and a layout pass. The measuring 369 * pass is implemented in {@link #measure(int, int)} and is a top-down traversal 370 * of the view tree. Each view pushes dimension specifications down the tree 371 * during the recursion. At the end of the measure pass, every view has stored 372 * its measurements. The second pass happens in 373 * {@link #layout(int,int,int,int)} and is also top-down. During 374 * this pass each parent is responsible for positioning all of its children 375 * using the sizes computed in the measure pass. 376 * </p> 377 * 378 * <p> 379 * When a view's measure() method returns, its {@link #getMeasuredWidth()} and 380 * {@link #getMeasuredHeight()} values must be set, along with those for all of 381 * that view's descendants. A view's measured width and measured height values 382 * must respect the constraints imposed by the view's parents. This guarantees 383 * that at the end of the measure pass, all parents accept all of their 384 * children's measurements. A parent view may call measure() more than once on 385 * its children. For example, the parent may measure each child once with 386 * unspecified dimensions to find out how big they want to be, then call 387 * measure() on them again with actual numbers if the sum of all the children's 388 * unconstrained sizes is too big or too small. 389 * </p> 390 * 391 * <p> 392 * The measure pass uses two classes to communicate dimensions. The 393 * {@link MeasureSpec} class is used by views to tell their parents how they 394 * want to be measured and positioned. The base LayoutParams class just 395 * describes how big the view wants to be for both width and height. For each 396 * dimension, it can specify one of: 397 * <ul> 398 * <li> an exact number 399 * <li>MATCH_PARENT, which means the view wants to be as big as its parent 400 * (minus padding) 401 * <li> WRAP_CONTENT, which means that the view wants to be just big enough to 402 * enclose its content (plus padding). 403 * </ul> 404 * There are subclasses of LayoutParams for different subclasses of ViewGroup. 405 * For example, AbsoluteLayout has its own subclass of LayoutParams which adds 406 * an X and Y value. 407 * </p> 408 * 409 * <p> 410 * MeasureSpecs are used to push requirements down the tree from parent to 411 * child. A MeasureSpec can be in one of three modes: 412 * <ul> 413 * <li>UNSPECIFIED: This is used by a parent to determine the desired dimension 414 * of a child view. For example, a LinearLayout may call measure() on its child 415 * with the height set to UNSPECIFIED and a width of EXACTLY 240 to find out how 416 * tall the child view wants to be given a width of 240 pixels. 417 * <li>EXACTLY: This is used by the parent to impose an exact size on the 418 * child. The child must use this size, and guarantee that all of its 419 * descendants will fit within this size. 420 * <li>AT_MOST: This is used by the parent to impose a maximum size on the 421 * child. The child must gurantee that it and all of its descendants will fit 422 * within this size. 423 * </ul> 424 * </p> 425 * 426 * <p> 427 * To intiate a layout, call {@link #requestLayout}. This method is typically 428 * called by a view on itself when it believes that is can no longer fit within 429 * its current bounds. 430 * </p> 431 * 432 * <a name="Drawing"></a> 433 * <h3>Drawing</h3> 434 * <p> 435 * Drawing is handled by walking the tree and rendering each view that 436 * intersects the invalid region. Because the tree is traversed in-order, 437 * this means that parents will draw before (i.e., behind) their children, with 438 * siblings drawn in the order they appear in the tree. 439 * If you set a background drawable for a View, then the View will draw it for you 440 * before calling back to its <code>onDraw()</code> method. 441 * </p> 442 * 443 * <p> 444 * Note that the framework will not draw views that are not in the invalid region. 445 * </p> 446 * 447 * <p> 448 * To force a view to draw, call {@link #invalidate()}. 449 * </p> 450 * 451 * <a name="EventHandlingThreading"></a> 452 * <h3>Event Handling and Threading</h3> 453 * <p> 454 * The basic cycle of a view is as follows: 455 * <ol> 456 * <li>An event comes in and is dispatched to the appropriate view. The view 457 * handles the event and notifies any listeners.</li> 458 * <li>If in the course of processing the event, the view's bounds may need 459 * to be changed, the view will call {@link #requestLayout()}.</li> 460 * <li>Similarly, if in the course of processing the event the view's appearance 461 * may need to be changed, the view will call {@link #invalidate()}.</li> 462 * <li>If either {@link #requestLayout()} or {@link #invalidate()} were called, 463 * the framework will take care of measuring, laying out, and drawing the tree 464 * as appropriate.</li> 465 * </ol> 466 * </p> 467 * 468 * <p><em>Note: The entire view tree is single threaded. You must always be on 469 * the UI thread when calling any method on any view.</em> 470 * If you are doing work on other threads and want to update the state of a view 471 * from that thread, you should use a {@link Handler}. 472 * </p> 473 * 474 * <a name="FocusHandling"></a> 475 * <h3>Focus Handling</h3> 476 * <p> 477 * The framework will handle routine focus movement in response to user input. 478 * This includes changing the focus as views are removed or hidden, or as new 479 * views become available. Views indicate their willingness to take focus 480 * through the {@link #isFocusable} method. To change whether a view can take 481 * focus, call {@link #setFocusable(boolean)}. When in touch mode (see notes below) 482 * views indicate whether they still would like focus via {@link #isFocusableInTouchMode} 483 * and can change this via {@link #setFocusableInTouchMode(boolean)}. 484 * </p> 485 * <p> 486 * Focus movement is based on an algorithm which finds the nearest neighbor in a 487 * given direction. In rare cases, the default algorithm may not match the 488 * intended behavior of the developer. In these situations, you can provide 489 * explicit overrides by using these XML attributes in the layout file: 490 * <pre> 491 * nextFocusDown 492 * nextFocusLeft 493 * nextFocusRight 494 * nextFocusUp 495 * </pre> 496 * </p> 497 * 498 * 499 * <p> 500 * To get a particular view to take focus, call {@link #requestFocus()}. 501 * </p> 502 * 503 * <a name="TouchMode"></a> 504 * <h3>Touch Mode</h3> 505 * <p> 506 * When a user is navigating a user interface via directional keys such as a D-pad, it is 507 * necessary to give focus to actionable items such as buttons so the user can see 508 * what will take input. If the device has touch capabilities, however, and the user 509 * begins interacting with the interface by touching it, it is no longer necessary to 510 * always highlight, or give focus to, a particular view. This motivates a mode 511 * for interaction named 'touch mode'. 512 * </p> 513 * <p> 514 * For a touch capable device, once the user touches the screen, the device 515 * will enter touch mode. From this point onward, only views for which 516 * {@link #isFocusableInTouchMode} is true will be focusable, such as text editing widgets. 517 * Other views that are touchable, like buttons, will not take focus when touched; they will 518 * only fire the on click listeners. 519 * </p> 520 * <p> 521 * Any time a user hits a directional key, such as a D-pad direction, the view device will 522 * exit touch mode, and find a view to take focus, so that the user may resume interacting 523 * with the user interface without touching the screen again. 524 * </p> 525 * <p> 526 * The touch mode state is maintained across {@link android.app.Activity}s. Call 527 * {@link #isInTouchMode} to see whether the device is currently in touch mode. 528 * </p> 529 * 530 * <a name="Scrolling"></a> 531 * <h3>Scrolling</h3> 532 * <p> 533 * The framework provides basic support for views that wish to internally 534 * scroll their content. This includes keeping track of the X and Y scroll 535 * offset as well as mechanisms for drawing scrollbars. See 536 * {@link #scrollBy(int, int)}, {@link #scrollTo(int, int)}, and 537 * {@link #awakenScrollBars()} for more details. 538 * </p> 539 * 540 * <a name="Tags"></a> 541 * <h3>Tags</h3> 542 * <p> 543 * Unlike IDs, tags are not used to identify views. Tags are essentially an 544 * extra piece of information that can be associated with a view. They are most 545 * often used as a convenience to store data related to views in the views 546 * themselves rather than by putting them in a separate structure. 547 * </p> 548 * 549 * <a name="Properties"></a> 550 * <h3>Properties</h3> 551 * <p> 552 * The View class exposes an {@link #ALPHA} property, as well as several transform-related 553 * properties, such as {@link #TRANSLATION_X} and {@link #TRANSLATION_Y}. These properties are 554 * available both in the {@link Property} form as well as in similarly-named setter/getter 555 * methods (such as {@link #setAlpha(float)} for {@link #ALPHA}). These properties can 556 * be used to set persistent state associated with these rendering-related properties on the view. 557 * The properties and methods can also be used in conjunction with 558 * {@link android.animation.Animator Animator}-based animations, described more in the 559 * <a href="#Animation">Animation</a> section. 560 * </p> 561 * 562 * <a name="Animation"></a> 563 * <h3>Animation</h3> 564 * <p> 565 * Starting with Android 3.0, the preferred way of animating views is to use the 566 * {@link android.animation} package APIs. These {@link android.animation.Animator Animator}-based 567 * classes change actual properties of the View object, such as {@link #setAlpha(float) alpha} and 568 * {@link #setTranslationX(float) translationX}. This behavior is contrasted to that of the pre-3.0 569 * {@link android.view.animation.Animation Animation}-based classes, which instead animate only 570 * how the view is drawn on the display. In particular, the {@link ViewPropertyAnimator} class 571 * makes animating these View properties particularly easy and efficient. 572 * </p> 573 * <p> 574 * Alternatively, you can use the pre-3.0 animation classes to animate how Views are rendered. 575 * You can attach an {@link Animation} object to a view using 576 * {@link #setAnimation(Animation)} or 577 * {@link #startAnimation(Animation)}. The animation can alter the scale, 578 * rotation, translation and alpha of a view over time. If the animation is 579 * attached to a view that has children, the animation will affect the entire 580 * subtree rooted by that node. When an animation is started, the framework will 581 * take care of redrawing the appropriate views until the animation completes. 582 * </p> 583 * 584 * <a name="Security"></a> 585 * <h3>Security</h3> 586 * <p> 587 * Sometimes it is essential that an application be able to verify that an action 588 * is being performed with the full knowledge and consent of the user, such as 589 * granting a permission request, making a purchase or clicking on an advertisement. 590 * Unfortunately, a malicious application could try to spoof the user into 591 * performing these actions, unaware, by concealing the intended purpose of the view. 592 * As a remedy, the framework offers a touch filtering mechanism that can be used to 593 * improve the security of views that provide access to sensitive functionality. 594 * </p><p> 595 * To enable touch filtering, call {@link #setFilterTouchesWhenObscured(boolean)} or set the 596 * android:filterTouchesWhenObscured layout attribute to true. When enabled, the framework 597 * will discard touches that are received whenever the view's window is obscured by 598 * another visible window. As a result, the view will not receive touches whenever a 599 * toast, dialog or other window appears above the view's window. 600 * </p><p> 601 * For more fine-grained control over security, consider overriding the 602 * {@link #onFilterTouchEventForSecurity(MotionEvent)} method to implement your own 603 * security policy. See also {@link MotionEvent#FLAG_WINDOW_IS_OBSCURED}. 604 * </p> 605 * 606 * @attr ref android.R.styleable#View_alpha 607 * @attr ref android.R.styleable#View_background 608 * @attr ref android.R.styleable#View_clickable 609 * @attr ref android.R.styleable#View_contentDescription 610 * @attr ref android.R.styleable#View_drawingCacheQuality 611 * @attr ref android.R.styleable#View_duplicateParentState 612 * @attr ref android.R.styleable#View_id 613 * @attr ref android.R.styleable#View_requiresFadingEdge 614 * @attr ref android.R.styleable#View_fadeScrollbars 615 * @attr ref android.R.styleable#View_fadingEdgeLength 616 * @attr ref android.R.styleable#View_filterTouchesWhenObscured 617 * @attr ref android.R.styleable#View_fitsSystemWindows 618 * @attr ref android.R.styleable#View_isScrollContainer 619 * @attr ref android.R.styleable#View_focusable 620 * @attr ref android.R.styleable#View_focusableInTouchMode 621 * @attr ref android.R.styleable#View_hapticFeedbackEnabled 622 * @attr ref android.R.styleable#View_keepScreenOn 623 * @attr ref android.R.styleable#View_layerType 624 * @attr ref android.R.styleable#View_layoutDirection 625 * @attr ref android.R.styleable#View_longClickable 626 * @attr ref android.R.styleable#View_minHeight 627 * @attr ref android.R.styleable#View_minWidth 628 * @attr ref android.R.styleable#View_nextFocusDown 629 * @attr ref android.R.styleable#View_nextFocusLeft 630 * @attr ref android.R.styleable#View_nextFocusRight 631 * @attr ref android.R.styleable#View_nextFocusUp 632 * @attr ref android.R.styleable#View_onClick 633 * @attr ref android.R.styleable#View_padding 634 * @attr ref android.R.styleable#View_paddingBottom 635 * @attr ref android.R.styleable#View_paddingLeft 636 * @attr ref android.R.styleable#View_paddingRight 637 * @attr ref android.R.styleable#View_paddingTop 638 * @attr ref android.R.styleable#View_paddingStart 639 * @attr ref android.R.styleable#View_paddingEnd 640 * @attr ref android.R.styleable#View_saveEnabled 641 * @attr ref android.R.styleable#View_rotation 642 * @attr ref android.R.styleable#View_rotationX 643 * @attr ref android.R.styleable#View_rotationY 644 * @attr ref android.R.styleable#View_scaleX 645 * @attr ref android.R.styleable#View_scaleY 646 * @attr ref android.R.styleable#View_scrollX 647 * @attr ref android.R.styleable#View_scrollY 648 * @attr ref android.R.styleable#View_scrollbarSize 649 * @attr ref android.R.styleable#View_scrollbarStyle 650 * @attr ref android.R.styleable#View_scrollbars 651 * @attr ref android.R.styleable#View_scrollbarDefaultDelayBeforeFade 652 * @attr ref android.R.styleable#View_scrollbarFadeDuration 653 * @attr ref android.R.styleable#View_scrollbarTrackHorizontal 654 * @attr ref android.R.styleable#View_scrollbarThumbHorizontal 655 * @attr ref android.R.styleable#View_scrollbarThumbVertical 656 * @attr ref android.R.styleable#View_scrollbarTrackVertical 657 * @attr ref android.R.styleable#View_scrollbarAlwaysDrawHorizontalTrack 658 * @attr ref android.R.styleable#View_scrollbarAlwaysDrawVerticalTrack 659 * @attr ref android.R.styleable#View_soundEffectsEnabled 660 * @attr ref android.R.styleable#View_tag 661 * @attr ref android.R.styleable#View_textAlignment 662 * @attr ref android.R.styleable#View_textDirection 663 * @attr ref android.R.styleable#View_transformPivotX 664 * @attr ref android.R.styleable#View_transformPivotY 665 * @attr ref android.R.styleable#View_translationX 666 * @attr ref android.R.styleable#View_translationY 667 * @attr ref android.R.styleable#View_visibility 668 * 669 * @see android.view.ViewGroup 670 */ 671 public class View implements Drawable.Callback, KeyEvent.Callback, 672 AccessibilityEventSource { 673 private static final boolean DBG = false; 674 675 /** 676 * The logging tag used by this class with android.util.Log. 677 */ 678 protected static final String VIEW_LOG_TAG = "View"; 679 680 /** 681 * When set to true, apps will draw debugging information about their layouts. 682 * 683 * @hide 684 */ 685 public static final String DEBUG_LAYOUT_PROPERTY = "debug.layout"; 686 687 /** 688 * Used to mark a View that has no ID. 689 */ 690 public static final int NO_ID = -1; 691 692 private static boolean sUseBrokenMakeMeasureSpec = false; 693 694 /** 695 * This view does not want keystrokes. Use with TAKES_FOCUS_MASK when 696 * calling setFlags. 697 */ 698 private static final int NOT_FOCUSABLE = 0x00000000; 699 700 /** 701 * This view wants keystrokes. Use with TAKES_FOCUS_MASK when calling 702 * setFlags. 703 */ 704 private static final int FOCUSABLE = 0x00000001; 705 706 /** 707 * Mask for use with setFlags indicating bits used for focus. 708 */ 709 private static final int FOCUSABLE_MASK = 0x00000001; 710 711 /** 712 * This view will adjust its padding to fit sytem windows (e.g. status bar) 713 */ 714 private static final int FITS_SYSTEM_WINDOWS = 0x00000002; 715 716 /** 717 * This view is visible. 718 * Use with {@link #setVisibility} and <a href="#attr_android:visibility">{@code 719 * android:visibility}. 720 */ 721 public static final int VISIBLE = 0x00000000; 722 723 /** 724 * This view is invisible, but it still takes up space for layout purposes. 725 * Use with {@link #setVisibility} and <a href="#attr_android:visibility">{@code 726 * android:visibility}. 727 */ 728 public static final int INVISIBLE = 0x00000004; 729 730 /** 731 * This view is invisible, and it doesn't take any space for layout 732 * purposes. Use with {@link #setVisibility} and <a href="#attr_android:visibility">{@code 733 * android:visibility}. 734 */ 735 public static final int GONE = 0x00000008; 736 737 /** 738 * Mask for use with setFlags indicating bits used for visibility. 739 * {@hide} 740 */ 741 static final int VISIBILITY_MASK = 0x0000000C; 742 743 private static final int[] VISIBILITY_FLAGS = {VISIBLE, INVISIBLE, GONE}; 744 745 /** 746 * This view is enabled. Interpretation varies by subclass. 747 * Use with ENABLED_MASK when calling setFlags. 748 * {@hide} 749 */ 750 static final int ENABLED = 0x00000000; 751 752 /** 753 * This view is disabled. Interpretation varies by subclass. 754 * Use with ENABLED_MASK when calling setFlags. 755 * {@hide} 756 */ 757 static final int DISABLED = 0x00000020; 758 759 /** 760 * Mask for use with setFlags indicating bits used for indicating whether 761 * this view is enabled 762 * {@hide} 763 */ 764 static final int ENABLED_MASK = 0x00000020; 765 766 /** 767 * This view won't draw. {@link #onDraw(android.graphics.Canvas)} won't be 768 * called and further optimizations will be performed. It is okay to have 769 * this flag set and a background. Use with DRAW_MASK when calling setFlags. 770 * {@hide} 771 */ 772 static final int WILL_NOT_DRAW = 0x00000080; 773 774 /** 775 * Mask for use with setFlags indicating bits used for indicating whether 776 * this view is will draw 777 * {@hide} 778 */ 779 static final int DRAW_MASK = 0x00000080; 780 781 /** 782 * <p>This view doesn't show scrollbars.</p> 783 * {@hide} 784 */ 785 static final int SCROLLBARS_NONE = 0x00000000; 786 787 /** 788 * <p>This view shows horizontal scrollbars.</p> 789 * {@hide} 790 */ 791 static final int SCROLLBARS_HORIZONTAL = 0x00000100; 792 793 /** 794 * <p>This view shows vertical scrollbars.</p> 795 * {@hide} 796 */ 797 static final int SCROLLBARS_VERTICAL = 0x00000200; 798 799 /** 800 * <p>Mask for use with setFlags indicating bits used for indicating which 801 * scrollbars are enabled.</p> 802 * {@hide} 803 */ 804 static final int SCROLLBARS_MASK = 0x00000300; 805 806 /** 807 * Indicates that the view should filter touches when its window is obscured. 808 * Refer to the class comments for more information about this security feature. 809 * {@hide} 810 */ 811 static final int FILTER_TOUCHES_WHEN_OBSCURED = 0x00000400; 812 813 /** 814 * Set for framework elements that use FITS_SYSTEM_WINDOWS, to indicate 815 * that they are optional and should be skipped if the window has 816 * requested system UI flags that ignore those insets for layout. 817 */ 818 static final int OPTIONAL_FITS_SYSTEM_WINDOWS = 0x00000800; 819 820 /** 821 * <p>This view doesn't show fading edges.</p> 822 * {@hide} 823 */ 824 static final int FADING_EDGE_NONE = 0x00000000; 825 826 /** 827 * <p>This view shows horizontal fading edges.</p> 828 * {@hide} 829 */ 830 static final int FADING_EDGE_HORIZONTAL = 0x00001000; 831 832 /** 833 * <p>This view shows vertical fading edges.</p> 834 * {@hide} 835 */ 836 static final int FADING_EDGE_VERTICAL = 0x00002000; 837 838 /** 839 * <p>Mask for use with setFlags indicating bits used for indicating which 840 * fading edges are enabled.</p> 841 * {@hide} 842 */ 843 static final int FADING_EDGE_MASK = 0x00003000; 844 845 /** 846 * <p>Indicates this view can be clicked. When clickable, a View reacts 847 * to clicks by notifying the OnClickListener.<p> 848 * {@hide} 849 */ 850 static final int CLICKABLE = 0x00004000; 851 852 /** 853 * <p>Indicates this view is caching its drawing into a bitmap.</p> 854 * {@hide} 855 */ 856 static final int DRAWING_CACHE_ENABLED = 0x00008000; 857 858 /** 859 * <p>Indicates that no icicle should be saved for this view.<p> 860 * {@hide} 861 */ 862 static final int SAVE_DISABLED = 0x000010000; 863 864 /** 865 * <p>Mask for use with setFlags indicating bits used for the saveEnabled 866 * property.</p> 867 * {@hide} 868 */ 869 static final int SAVE_DISABLED_MASK = 0x000010000; 870 871 /** 872 * <p>Indicates that no drawing cache should ever be created for this view.<p> 873 * {@hide} 874 */ 875 static final int WILL_NOT_CACHE_DRAWING = 0x000020000; 876 877 /** 878 * <p>Indicates this view can take / keep focus when int touch mode.</p> 879 * {@hide} 880 */ 881 static final int FOCUSABLE_IN_TOUCH_MODE = 0x00040000; 882 883 /** 884 * <p>Enables low quality mode for the drawing cache.</p> 885 */ 886 public static final int DRAWING_CACHE_QUALITY_LOW = 0x00080000; 887 888 /** 889 * <p>Enables high quality mode for the drawing cache.</p> 890 */ 891 public static final int DRAWING_CACHE_QUALITY_HIGH = 0x00100000; 892 893 /** 894 * <p>Enables automatic quality mode for the drawing cache.</p> 895 */ 896 public static final int DRAWING_CACHE_QUALITY_AUTO = 0x00000000; 897 898 private static final int[] DRAWING_CACHE_QUALITY_FLAGS = { 899 DRAWING_CACHE_QUALITY_AUTO, DRAWING_CACHE_QUALITY_LOW, DRAWING_CACHE_QUALITY_HIGH 900 }; 901 902 /** 903 * <p>Mask for use with setFlags indicating bits used for the cache 904 * quality property.</p> 905 * {@hide} 906 */ 907 static final int DRAWING_CACHE_QUALITY_MASK = 0x00180000; 908 909 /** 910 * <p> 911 * Indicates this view can be long clicked. When long clickable, a View 912 * reacts to long clicks by notifying the OnLongClickListener or showing a 913 * context menu. 914 * </p> 915 * {@hide} 916 */ 917 static final int LONG_CLICKABLE = 0x00200000; 918 919 /** 920 * <p>Indicates that this view gets its drawable states from its direct parent 921 * and ignores its original internal states.</p> 922 * 923 * @hide 924 */ 925 static final int DUPLICATE_PARENT_STATE = 0x00400000; 926 927 /** 928 * The scrollbar style to display the scrollbars inside the content area, 929 * without increasing the padding. The scrollbars will be overlaid with 930 * translucency on the view's content. 931 */ 932 public static final int SCROLLBARS_INSIDE_OVERLAY = 0; 933 934 /** 935 * The scrollbar style to display the scrollbars inside the padded area, 936 * increasing the padding of the view. The scrollbars will not overlap the 937 * content area of the view. 938 */ 939 public static final int SCROLLBARS_INSIDE_INSET = 0x01000000; 940 941 /** 942 * The scrollbar style to display the scrollbars at the edge of the view, 943 * without increasing the padding. The scrollbars will be overlaid with 944 * translucency. 945 */ 946 public static final int SCROLLBARS_OUTSIDE_OVERLAY = 0x02000000; 947 948 /** 949 * The scrollbar style to display the scrollbars at the edge of the view, 950 * increasing the padding of the view. The scrollbars will only overlap the 951 * background, if any. 952 */ 953 public static final int SCROLLBARS_OUTSIDE_INSET = 0x03000000; 954 955 /** 956 * Mask to check if the scrollbar style is overlay or inset. 957 * {@hide} 958 */ 959 static final int SCROLLBARS_INSET_MASK = 0x01000000; 960 961 /** 962 * Mask to check if the scrollbar style is inside or outside. 963 * {@hide} 964 */ 965 static final int SCROLLBARS_OUTSIDE_MASK = 0x02000000; 966 967 /** 968 * Mask for scrollbar style. 969 * {@hide} 970 */ 971 static final int SCROLLBARS_STYLE_MASK = 0x03000000; 972 973 /** 974 * View flag indicating that the screen should remain on while the 975 * window containing this view is visible to the user. This effectively 976 * takes care of automatically setting the WindowManager's 977 * {@link WindowManager.LayoutParams#FLAG_KEEP_SCREEN_ON}. 978 */ 979 public static final int KEEP_SCREEN_ON = 0x04000000; 980 981 /** 982 * View flag indicating whether this view should have sound effects enabled 983 * for events such as clicking and touching. 984 */ 985 public static final int SOUND_EFFECTS_ENABLED = 0x08000000; 986 987 /** 988 * View flag indicating whether this view should have haptic feedback 989 * enabled for events such as long presses. 990 */ 991 public static final int HAPTIC_FEEDBACK_ENABLED = 0x10000000; 992 993 /** 994 * <p>Indicates that the view hierarchy should stop saving state when 995 * it reaches this view. If state saving is initiated immediately at 996 * the view, it will be allowed. 997 * {@hide} 998 */ 999 static final int PARENT_SAVE_DISABLED = 0x20000000; 1000 1001 /** 1002 * <p>Mask for use with setFlags indicating bits used for PARENT_SAVE_DISABLED.</p> 1003 * {@hide} 1004 */ 1005 static final int PARENT_SAVE_DISABLED_MASK = 0x20000000; 1006 1007 /** 1008 * View flag indicating whether {@link #addFocusables(ArrayList, int, int)} 1009 * should add all focusable Views regardless if they are focusable in touch mode. 1010 */ 1011 public static final int FOCUSABLES_ALL = 0x00000000; 1012 1013 /** 1014 * View flag indicating whether {@link #addFocusables(ArrayList, int, int)} 1015 * should add only Views focusable in touch mode. 1016 */ 1017 public static final int FOCUSABLES_TOUCH_MODE = 0x00000001; 1018 1019 /** 1020 * Use with {@link #focusSearch(int)}. Move focus to the previous selectable 1021 * item. 1022 */ 1023 public static final int FOCUS_BACKWARD = 0x00000001; 1024 1025 /** 1026 * Use with {@link #focusSearch(int)}. Move focus to the next selectable 1027 * item. 1028 */ 1029 public static final int FOCUS_FORWARD = 0x00000002; 1030 1031 /** 1032 * Use with {@link #focusSearch(int)}. Move focus to the left. 1033 */ 1034 public static final int FOCUS_LEFT = 0x00000011; 1035 1036 /** 1037 * Use with {@link #focusSearch(int)}. Move focus up. 1038 */ 1039 public static final int FOCUS_UP = 0x00000021; 1040 1041 /** 1042 * Use with {@link #focusSearch(int)}. Move focus to the right. 1043 */ 1044 public static final int FOCUS_RIGHT = 0x00000042; 1045 1046 /** 1047 * Use with {@link #focusSearch(int)}. Move focus down. 1048 */ 1049 public static final int FOCUS_DOWN = 0x00000082; 1050 1051 /** 1052 * Bits of {@link #getMeasuredWidthAndState()} and 1053 * {@link #getMeasuredWidthAndState()} that provide the actual measured size. 1054 */ 1055 public static final int MEASURED_SIZE_MASK = 0x00ffffff; 1056 1057 /** 1058 * Bits of {@link #getMeasuredWidthAndState()} and 1059 * {@link #getMeasuredWidthAndState()} that provide the additional state bits. 1060 */ 1061 public static final int MEASURED_STATE_MASK = 0xff000000; 1062 1063 /** 1064 * Bit shift of {@link #MEASURED_STATE_MASK} to get to the height bits 1065 * for functions that combine both width and height into a single int, 1066 * such as {@link #getMeasuredState()} and the childState argument of 1067 * {@link #resolveSizeAndState(int, int, int)}. 1068 */ 1069 public static final int MEASURED_HEIGHT_STATE_SHIFT = 16; 1070 1071 /** 1072 * Bit of {@link #getMeasuredWidthAndState()} and 1073 * {@link #getMeasuredWidthAndState()} that indicates the measured size 1074 * is smaller that the space the view would like to have. 1075 */ 1076 public static final int MEASURED_STATE_TOO_SMALL = 0x01000000; 1077 1078 /** 1079 * Base View state sets 1080 */ 1081 // Singles 1082 /** 1083 * Indicates the view has no states set. States are used with 1084 * {@link android.graphics.drawable.Drawable} to change the drawing of the 1085 * view depending on its state. 1086 * 1087 * @see android.graphics.drawable.Drawable 1088 * @see #getDrawableState() 1089 */ 1090 protected static final int[] EMPTY_STATE_SET; 1091 /** 1092 * Indicates the view is enabled. States are used with 1093 * {@link android.graphics.drawable.Drawable} to change the drawing of the 1094 * view depending on its state. 1095 * 1096 * @see android.graphics.drawable.Drawable 1097 * @see #getDrawableState() 1098 */ 1099 protected static final int[] ENABLED_STATE_SET; 1100 /** 1101 * Indicates the view is focused. States are used with 1102 * {@link android.graphics.drawable.Drawable} to change the drawing of the 1103 * view depending on its state. 1104 * 1105 * @see android.graphics.drawable.Drawable 1106 * @see #getDrawableState() 1107 */ 1108 protected static final int[] FOCUSED_STATE_SET; 1109 /** 1110 * Indicates the view is selected. States are used with 1111 * {@link android.graphics.drawable.Drawable} to change the drawing of the 1112 * view depending on its state. 1113 * 1114 * @see android.graphics.drawable.Drawable 1115 * @see #getDrawableState() 1116 */ 1117 protected static final int[] SELECTED_STATE_SET; 1118 /** 1119 * Indicates the view is pressed. States are used with 1120 * {@link android.graphics.drawable.Drawable} to change the drawing of the 1121 * view depending on its state. 1122 * 1123 * @see android.graphics.drawable.Drawable 1124 * @see #getDrawableState() 1125 * @hide 1126 */ 1127 protected static final int[] PRESSED_STATE_SET; 1128 /** 1129 * Indicates the view's window has focus. States are used with 1130 * {@link android.graphics.drawable.Drawable} to change the drawing of the 1131 * view depending on its state. 1132 * 1133 * @see android.graphics.drawable.Drawable 1134 * @see #getDrawableState() 1135 */ 1136 protected static final int[] WINDOW_FOCUSED_STATE_SET; 1137 // Doubles 1138 /** 1139 * Indicates the view is enabled and has the focus. 1140 * 1141 * @see #ENABLED_STATE_SET 1142 * @see #FOCUSED_STATE_SET 1143 */ 1144 protected static final int[] ENABLED_FOCUSED_STATE_SET; 1145 /** 1146 * Indicates the view is enabled and selected. 1147 * 1148 * @see #ENABLED_STATE_SET 1149 * @see #SELECTED_STATE_SET 1150 */ 1151 protected static final int[] ENABLED_SELECTED_STATE_SET; 1152 /** 1153 * Indicates the view is enabled and that its window has focus. 1154 * 1155 * @see #ENABLED_STATE_SET 1156 * @see #WINDOW_FOCUSED_STATE_SET 1157 */ 1158 protected static final int[] ENABLED_WINDOW_FOCUSED_STATE_SET; 1159 /** 1160 * Indicates the view is focused and selected. 1161 * 1162 * @see #FOCUSED_STATE_SET 1163 * @see #SELECTED_STATE_SET 1164 */ 1165 protected static final int[] FOCUSED_SELECTED_STATE_SET; 1166 /** 1167 * Indicates the view has the focus and that its window has the focus. 1168 * 1169 * @see #FOCUSED_STATE_SET 1170 * @see #WINDOW_FOCUSED_STATE_SET 1171 */ 1172 protected static final int[] FOCUSED_WINDOW_FOCUSED_STATE_SET; 1173 /** 1174 * Indicates the view is selected and that its window has the focus. 1175 * 1176 * @see #SELECTED_STATE_SET 1177 * @see #WINDOW_FOCUSED_STATE_SET 1178 */ 1179 protected static final int[] SELECTED_WINDOW_FOCUSED_STATE_SET; 1180 // Triples 1181 /** 1182 * Indicates the view is enabled, focused and selected. 1183 * 1184 * @see #ENABLED_STATE_SET 1185 * @see #FOCUSED_STATE_SET 1186 * @see #SELECTED_STATE_SET 1187 */ 1188 protected static final int[] ENABLED_FOCUSED_SELECTED_STATE_SET; 1189 /** 1190 * Indicates the view is enabled, focused and its window has the focus. 1191 * 1192 * @see #ENABLED_STATE_SET 1193 * @see #FOCUSED_STATE_SET 1194 * @see #WINDOW_FOCUSED_STATE_SET 1195 */ 1196 protected static final int[] ENABLED_FOCUSED_WINDOW_FOCUSED_STATE_SET; 1197 /** 1198 * Indicates the view is enabled, selected and its window has the focus. 1199 * 1200 * @see #ENABLED_STATE_SET 1201 * @see #SELECTED_STATE_SET 1202 * @see #WINDOW_FOCUSED_STATE_SET 1203 */ 1204 protected static final int[] ENABLED_SELECTED_WINDOW_FOCUSED_STATE_SET; 1205 /** 1206 * Indicates the view is focused, selected and its window has the focus. 1207 * 1208 * @see #FOCUSED_STATE_SET 1209 * @see #SELECTED_STATE_SET 1210 * @see #WINDOW_FOCUSED_STATE_SET 1211 */ 1212 protected static final int[] FOCUSED_SELECTED_WINDOW_FOCUSED_STATE_SET; 1213 /** 1214 * Indicates the view is enabled, focused, selected and its window 1215 * has the focus. 1216 * 1217 * @see #ENABLED_STATE_SET 1218 * @see #FOCUSED_STATE_SET 1219 * @see #SELECTED_STATE_SET 1220 * @see #WINDOW_FOCUSED_STATE_SET 1221 */ 1222 protected static final int[] ENABLED_FOCUSED_SELECTED_WINDOW_FOCUSED_STATE_SET; 1223 /** 1224 * Indicates the view is pressed and its window has the focus. 1225 * 1226 * @see #PRESSED_STATE_SET 1227 * @see #WINDOW_FOCUSED_STATE_SET 1228 */ 1229 protected static final int[] PRESSED_WINDOW_FOCUSED_STATE_SET; 1230 /** 1231 * Indicates the view is pressed and selected. 1232 * 1233 * @see #PRESSED_STATE_SET 1234 * @see #SELECTED_STATE_SET 1235 */ 1236 protected static final int[] PRESSED_SELECTED_STATE_SET; 1237 /** 1238 * Indicates the view is pressed, selected and its window has the focus. 1239 * 1240 * @see #PRESSED_STATE_SET 1241 * @see #SELECTED_STATE_SET 1242 * @see #WINDOW_FOCUSED_STATE_SET 1243 */ 1244 protected static final int[] PRESSED_SELECTED_WINDOW_FOCUSED_STATE_SET; 1245 /** 1246 * Indicates the view is pressed and focused. 1247 * 1248 * @see #PRESSED_STATE_SET 1249 * @see #FOCUSED_STATE_SET 1250 */ 1251 protected static final int[] PRESSED_FOCUSED_STATE_SET; 1252 /** 1253 * Indicates the view is pressed, focused and its window has the focus. 1254 * 1255 * @see #PRESSED_STATE_SET 1256 * @see #FOCUSED_STATE_SET 1257 * @see #WINDOW_FOCUSED_STATE_SET 1258 */ 1259 protected static final int[] PRESSED_FOCUSED_WINDOW_FOCUSED_STATE_SET; 1260 /** 1261 * Indicates the view is pressed, focused and selected. 1262 * 1263 * @see #PRESSED_STATE_SET 1264 * @see #SELECTED_STATE_SET 1265 * @see #FOCUSED_STATE_SET 1266 */ 1267 protected static final int[] PRESSED_FOCUSED_SELECTED_STATE_SET; 1268 /** 1269 * Indicates the view is pressed, focused, selected and its window has the focus. 1270 * 1271 * @see #PRESSED_STATE_SET 1272 * @see #FOCUSED_STATE_SET 1273 * @see #SELECTED_STATE_SET 1274 * @see #WINDOW_FOCUSED_STATE_SET 1275 */ 1276 protected static final int[] PRESSED_FOCUSED_SELECTED_WINDOW_FOCUSED_STATE_SET; 1277 /** 1278 * Indicates the view is pressed and enabled. 1279 * 1280 * @see #PRESSED_STATE_SET 1281 * @see #ENABLED_STATE_SET 1282 */ 1283 protected static final int[] PRESSED_ENABLED_STATE_SET; 1284 /** 1285 * Indicates the view is pressed, enabled and its window has the focus. 1286 * 1287 * @see #PRESSED_STATE_SET 1288 * @see #ENABLED_STATE_SET 1289 * @see #WINDOW_FOCUSED_STATE_SET 1290 */ 1291 protected static final int[] PRESSED_ENABLED_WINDOW_FOCUSED_STATE_SET; 1292 /** 1293 * Indicates the view is pressed, enabled and selected. 1294 * 1295 * @see #PRESSED_STATE_SET 1296 * @see #ENABLED_STATE_SET 1297 * @see #SELECTED_STATE_SET 1298 */ 1299 protected static final int[] PRESSED_ENABLED_SELECTED_STATE_SET; 1300 /** 1301 * Indicates the view is pressed, enabled, selected and its window has the 1302 * focus. 1303 * 1304 * @see #PRESSED_STATE_SET 1305 * @see #ENABLED_STATE_SET 1306 * @see #SELECTED_STATE_SET 1307 * @see #WINDOW_FOCUSED_STATE_SET 1308 */ 1309 protected static final int[] PRESSED_ENABLED_SELECTED_WINDOW_FOCUSED_STATE_SET; 1310 /** 1311 * Indicates the view is pressed, enabled and focused. 1312 * 1313 * @see #PRESSED_STATE_SET 1314 * @see #ENABLED_STATE_SET 1315 * @see #FOCUSED_STATE_SET 1316 */ 1317 protected static final int[] PRESSED_ENABLED_FOCUSED_STATE_SET; 1318 /** 1319 * Indicates the view is pressed, enabled, focused and its window has the 1320 * focus. 1321 * 1322 * @see #PRESSED_STATE_SET 1323 * @see #ENABLED_STATE_SET 1324 * @see #FOCUSED_STATE_SET 1325 * @see #WINDOW_FOCUSED_STATE_SET 1326 */ 1327 protected static final int[] PRESSED_ENABLED_FOCUSED_WINDOW_FOCUSED_STATE_SET; 1328 /** 1329 * Indicates the view is pressed, enabled, focused and selected. 1330 * 1331 * @see #PRESSED_STATE_SET 1332 * @see #ENABLED_STATE_SET 1333 * @see #SELECTED_STATE_SET 1334 * @see #FOCUSED_STATE_SET 1335 */ 1336 protected static final int[] PRESSED_ENABLED_FOCUSED_SELECTED_STATE_SET; 1337 /** 1338 * Indicates the view is pressed, enabled, focused, selected and its window 1339 * has the focus. 1340 * 1341 * @see #PRESSED_STATE_SET 1342 * @see #ENABLED_STATE_SET 1343 * @see #SELECTED_STATE_SET 1344 * @see #FOCUSED_STATE_SET 1345 * @see #WINDOW_FOCUSED_STATE_SET 1346 */ 1347 protected static final int[] PRESSED_ENABLED_FOCUSED_SELECTED_WINDOW_FOCUSED_STATE_SET; 1348 1349 /** 1350 * The order here is very important to {@link #getDrawableState()} 1351 */ 1352 private static final int[][] VIEW_STATE_SETS; 1353 1354 static final int VIEW_STATE_WINDOW_FOCUSED = 1; 1355 static final int VIEW_STATE_SELECTED = 1 << 1; 1356 static final int VIEW_STATE_FOCUSED = 1 << 2; 1357 static final int VIEW_STATE_ENABLED = 1 << 3; 1358 static final int VIEW_STATE_PRESSED = 1 << 4; 1359 static final int VIEW_STATE_ACTIVATED = 1 << 5; 1360 static final int VIEW_STATE_ACCELERATED = 1 << 6; 1361 static final int VIEW_STATE_HOVERED = 1 << 7; 1362 static final int VIEW_STATE_DRAG_CAN_ACCEPT = 1 << 8; 1363 static final int VIEW_STATE_DRAG_HOVERED = 1 << 9; 1364 1365 static final int[] VIEW_STATE_IDS = new int[] { 1366 R.attr.state_window_focused, VIEW_STATE_WINDOW_FOCUSED, 1367 R.attr.state_selected, VIEW_STATE_SELECTED, 1368 R.attr.state_focused, VIEW_STATE_FOCUSED, 1369 R.attr.state_enabled, VIEW_STATE_ENABLED, 1370 R.attr.state_pressed, VIEW_STATE_PRESSED, 1371 R.attr.state_activated, VIEW_STATE_ACTIVATED, 1372 R.attr.state_accelerated, VIEW_STATE_ACCELERATED, 1373 R.attr.state_hovered, VIEW_STATE_HOVERED, 1374 R.attr.state_drag_can_accept, VIEW_STATE_DRAG_CAN_ACCEPT, 1375 R.attr.state_drag_hovered, VIEW_STATE_DRAG_HOVERED 1376 }; 1377 1378 static { 1379 if ((VIEW_STATE_IDS.length/2) != R.styleable.ViewDrawableStates.length) { 1380 throw new IllegalStateException( 1381 "VIEW_STATE_IDs array length does not match ViewDrawableStates style array"); 1382 } 1383 int[] orderedIds = new int[VIEW_STATE_IDS.length]; 1384 for (int i = 0; i < R.styleable.ViewDrawableStates.length; i++) { 1385 int viewState = R.styleable.ViewDrawableStates[i]; 1386 for (int j = 0; j<VIEW_STATE_IDS.length; j += 2) { 1387 if (VIEW_STATE_IDS[j] == viewState) { 1388 orderedIds[i * 2] = viewState; 1389 orderedIds[i * 2 + 1] = VIEW_STATE_IDS[j + 1]; 1390 } 1391 } 1392 } 1393 final int NUM_BITS = VIEW_STATE_IDS.length / 2; 1394 VIEW_STATE_SETS = new int[1 << NUM_BITS][]; 1395 for (int i = 0; i < VIEW_STATE_SETS.length; i++) { 1396 int numBits = Integer.bitCount(i); 1397 int[] set = new int[numBits]; 1398 int pos = 0; 1399 for (int j = 0; j < orderedIds.length; j += 2) { 1400 if ((i & orderedIds[j+1]) != 0) { 1401 set[pos++] = orderedIds[j]; 1402 } 1403 } 1404 VIEW_STATE_SETS[i] = set; 1405 } 1406 1407 EMPTY_STATE_SET = VIEW_STATE_SETS[0]; 1408 WINDOW_FOCUSED_STATE_SET = VIEW_STATE_SETS[VIEW_STATE_WINDOW_FOCUSED]; 1409 SELECTED_STATE_SET = VIEW_STATE_SETS[VIEW_STATE_SELECTED]; 1410 SELECTED_WINDOW_FOCUSED_STATE_SET = VIEW_STATE_SETS[ 1411 VIEW_STATE_WINDOW_FOCUSED | VIEW_STATE_SELECTED]; 1412 FOCUSED_STATE_SET = VIEW_STATE_SETS[VIEW_STATE_FOCUSED]; 1413 FOCUSED_WINDOW_FOCUSED_STATE_SET = VIEW_STATE_SETS[ 1414 VIEW_STATE_WINDOW_FOCUSED | VIEW_STATE_FOCUSED]; 1415 FOCUSED_SELECTED_STATE_SET = VIEW_STATE_SETS[ 1416 VIEW_STATE_SELECTED | VIEW_STATE_FOCUSED]; 1417 FOCUSED_SELECTED_WINDOW_FOCUSED_STATE_SET = VIEW_STATE_SETS[ 1418 VIEW_STATE_WINDOW_FOCUSED | VIEW_STATE_SELECTED 1419 | VIEW_STATE_FOCUSED]; 1420 ENABLED_STATE_SET = VIEW_STATE_SETS[VIEW_STATE_ENABLED]; 1421 ENABLED_WINDOW_FOCUSED_STATE_SET = VIEW_STATE_SETS[ 1422 VIEW_STATE_WINDOW_FOCUSED | VIEW_STATE_ENABLED]; 1423 ENABLED_SELECTED_STATE_SET = VIEW_STATE_SETS[ 1424 VIEW_STATE_SELECTED | VIEW_STATE_ENABLED]; 1425 ENABLED_SELECTED_WINDOW_FOCUSED_STATE_SET = VIEW_STATE_SETS[ 1426 VIEW_STATE_WINDOW_FOCUSED | VIEW_STATE_SELECTED 1427 | VIEW_STATE_ENABLED]; 1428 ENABLED_FOCUSED_STATE_SET = VIEW_STATE_SETS[ 1429 VIEW_STATE_FOCUSED | VIEW_STATE_ENABLED]; 1430 ENABLED_FOCUSED_WINDOW_FOCUSED_STATE_SET = VIEW_STATE_SETS[ 1431 VIEW_STATE_WINDOW_FOCUSED | VIEW_STATE_FOCUSED 1432 | VIEW_STATE_ENABLED]; 1433 ENABLED_FOCUSED_SELECTED_STATE_SET = VIEW_STATE_SETS[ 1434 VIEW_STATE_SELECTED | VIEW_STATE_FOCUSED 1435 | VIEW_STATE_ENABLED]; 1436 ENABLED_FOCUSED_SELECTED_WINDOW_FOCUSED_STATE_SET = VIEW_STATE_SETS[ 1437 VIEW_STATE_WINDOW_FOCUSED | VIEW_STATE_SELECTED 1438 | VIEW_STATE_FOCUSED| VIEW_STATE_ENABLED]; 1439 1440 PRESSED_STATE_SET = VIEW_STATE_SETS[VIEW_STATE_PRESSED]; 1441 PRESSED_WINDOW_FOCUSED_STATE_SET = VIEW_STATE_SETS[ 1442 VIEW_STATE_WINDOW_FOCUSED | VIEW_STATE_PRESSED]; 1443 PRESSED_SELECTED_STATE_SET = VIEW_STATE_SETS[ 1444 VIEW_STATE_SELECTED | VIEW_STATE_PRESSED]; 1445 PRESSED_SELECTED_WINDOW_FOCUSED_STATE_SET = VIEW_STATE_SETS[ 1446 VIEW_STATE_WINDOW_FOCUSED | VIEW_STATE_SELECTED 1447 | VIEW_STATE_PRESSED]; 1448 PRESSED_FOCUSED_STATE_SET = VIEW_STATE_SETS[ 1449 VIEW_STATE_FOCUSED | VIEW_STATE_PRESSED]; 1450 PRESSED_FOCUSED_WINDOW_FOCUSED_STATE_SET = VIEW_STATE_SETS[ 1451 VIEW_STATE_WINDOW_FOCUSED | VIEW_STATE_FOCUSED 1452 | VIEW_STATE_PRESSED]; 1453 PRESSED_FOCUSED_SELECTED_STATE_SET = VIEW_STATE_SETS[ 1454 VIEW_STATE_SELECTED | VIEW_STATE_FOCUSED 1455 | VIEW_STATE_PRESSED]; 1456 PRESSED_FOCUSED_SELECTED_WINDOW_FOCUSED_STATE_SET = VIEW_STATE_SETS[ 1457 VIEW_STATE_WINDOW_FOCUSED | VIEW_STATE_SELECTED 1458 | VIEW_STATE_FOCUSED | VIEW_STATE_PRESSED]; 1459 PRESSED_ENABLED_STATE_SET = VIEW_STATE_SETS[ 1460 VIEW_STATE_ENABLED | VIEW_STATE_PRESSED]; 1461 PRESSED_ENABLED_WINDOW_FOCUSED_STATE_SET = VIEW_STATE_SETS[ 1462 VIEW_STATE_WINDOW_FOCUSED | VIEW_STATE_ENABLED 1463 | VIEW_STATE_PRESSED]; 1464 PRESSED_ENABLED_SELECTED_STATE_SET = VIEW_STATE_SETS[ 1465 VIEW_STATE_SELECTED | VIEW_STATE_ENABLED 1466 | VIEW_STATE_PRESSED]; 1467 PRESSED_ENABLED_SELECTED_WINDOW_FOCUSED_STATE_SET = VIEW_STATE_SETS[ 1468 VIEW_STATE_WINDOW_FOCUSED | VIEW_STATE_SELECTED 1469 | VIEW_STATE_ENABLED | VIEW_STATE_PRESSED]; 1470 PRESSED_ENABLED_FOCUSED_STATE_SET = VIEW_STATE_SETS[ 1471 VIEW_STATE_FOCUSED | VIEW_STATE_ENABLED 1472 | VIEW_STATE_PRESSED]; 1473 PRESSED_ENABLED_FOCUSED_WINDOW_FOCUSED_STATE_SET = VIEW_STATE_SETS[ 1474 VIEW_STATE_WINDOW_FOCUSED | VIEW_STATE_FOCUSED 1475 | VIEW_STATE_ENABLED | VIEW_STATE_PRESSED]; 1476 PRESSED_ENABLED_FOCUSED_SELECTED_STATE_SET = VIEW_STATE_SETS[ 1477 VIEW_STATE_SELECTED | VIEW_STATE_FOCUSED 1478 | VIEW_STATE_ENABLED | VIEW_STATE_PRESSED]; 1479 PRESSED_ENABLED_FOCUSED_SELECTED_WINDOW_FOCUSED_STATE_SET = VIEW_STATE_SETS[ 1480 VIEW_STATE_WINDOW_FOCUSED | VIEW_STATE_SELECTED 1481 | VIEW_STATE_FOCUSED| VIEW_STATE_ENABLED 1482 | VIEW_STATE_PRESSED]; 1483 } 1484 1485 /** 1486 * Accessibility event types that are dispatched for text population. 1487 */ 1488 private static final int POPULATING_ACCESSIBILITY_EVENT_TYPES = 1489 AccessibilityEvent.TYPE_VIEW_CLICKED 1490 | AccessibilityEvent.TYPE_VIEW_LONG_CLICKED 1491 | AccessibilityEvent.TYPE_VIEW_SELECTED 1492 | AccessibilityEvent.TYPE_VIEW_FOCUSED 1493 | AccessibilityEvent.TYPE_WINDOW_STATE_CHANGED 1494 | AccessibilityEvent.TYPE_VIEW_HOVER_ENTER 1495 | AccessibilityEvent.TYPE_VIEW_HOVER_EXIT 1496 | AccessibilityEvent.TYPE_VIEW_TEXT_CHANGED 1497 | AccessibilityEvent.TYPE_VIEW_TEXT_SELECTION_CHANGED 1498 | AccessibilityEvent.TYPE_VIEW_ACCESSIBILITY_FOCUSED 1499 | AccessibilityEvent.TYPE_VIEW_TEXT_TRAVERSED_AT_MOVEMENT_GRANULARITY; 1500 1501 /** 1502 * Temporary Rect currently for use in setBackground(). This will probably 1503 * be extended in the future to hold our own class with more than just 1504 * a Rect. :) 1505 */ 1506 static final ThreadLocal<Rect> sThreadLocal = new ThreadLocal<Rect>(); 1507 1508 /** 1509 * Map used to store views' tags. 1510 */ 1511 private SparseArray<Object> mKeyedTags; 1512 1513 /** 1514 * The next available accessibility id. 1515 */ 1516 private static int sNextAccessibilityViewId; 1517 1518 /** 1519 * The animation currently associated with this view. 1520 * @hide 1521 */ 1522 protected Animation mCurrentAnimation = null; 1523 1524 /** 1525 * Width as measured during measure pass. 1526 * {@hide} 1527 */ 1528 @ViewDebug.ExportedProperty(category = "measurement") 1529 int mMeasuredWidth; 1530 1531 /** 1532 * Height as measured during measure pass. 1533 * {@hide} 1534 */ 1535 @ViewDebug.ExportedProperty(category = "measurement") 1536 int mMeasuredHeight; 1537 1538 /** 1539 * Flag to indicate that this view was marked INVALIDATED, or had its display list 1540 * invalidated, prior to the current drawing iteration. If true, the view must re-draw 1541 * its display list. This flag, used only when hw accelerated, allows us to clear the 1542 * flag while retaining this information until it's needed (at getDisplayList() time and 1543 * in drawChild(), when we decide to draw a view's children's display lists into our own). 1544 * 1545 * {@hide} 1546 */ 1547 boolean mRecreateDisplayList = false; 1548 1549 /** 1550 * The view's identifier. 1551 * {@hide} 1552 * 1553 * @see #setId(int) 1554 * @see #getId() 1555 */ 1556 @ViewDebug.ExportedProperty(resolveId = true) 1557 int mID = NO_ID; 1558 1559 /** 1560 * The stable ID of this view for accessibility purposes. 1561 */ 1562 int mAccessibilityViewId = NO_ID; 1563 1564 private int mAccessibilityCursorPosition = ACCESSIBILITY_CURSOR_POSITION_UNDEFINED; 1565 1566 /** 1567 * The view's tag. 1568 * {@hide} 1569 * 1570 * @see #setTag(Object) 1571 * @see #getTag() 1572 */ 1573 protected Object mTag; 1574 1575 // for mPrivateFlags: 1576 /** {@hide} */ 1577 static final int PFLAG_WANTS_FOCUS = 0x00000001; 1578 /** {@hide} */ 1579 static final int PFLAG_FOCUSED = 0x00000002; 1580 /** {@hide} */ 1581 static final int PFLAG_SELECTED = 0x00000004; 1582 /** {@hide} */ 1583 static final int PFLAG_IS_ROOT_NAMESPACE = 0x00000008; 1584 /** {@hide} */ 1585 static final int PFLAG_HAS_BOUNDS = 0x00000010; 1586 /** {@hide} */ 1587 static final int PFLAG_DRAWN = 0x00000020; 1588 /** 1589 * When this flag is set, this view is running an animation on behalf of its 1590 * children and should therefore not cancel invalidate requests, even if they 1591 * lie outside of this view's bounds. 1592 * 1593 * {@hide} 1594 */ 1595 static final int PFLAG_DRAW_ANIMATION = 0x00000040; 1596 /** {@hide} */ 1597 static final int PFLAG_SKIP_DRAW = 0x00000080; 1598 /** {@hide} */ 1599 static final int PFLAG_ONLY_DRAWS_BACKGROUND = 0x00000100; 1600 /** {@hide} */ 1601 static final int PFLAG_REQUEST_TRANSPARENT_REGIONS = 0x00000200; 1602 /** {@hide} */ 1603 static final int PFLAG_DRAWABLE_STATE_DIRTY = 0x00000400; 1604 /** {@hide} */ 1605 static final int PFLAG_MEASURED_DIMENSION_SET = 0x00000800; 1606 /** {@hide} */ 1607 static final int PFLAG_FORCE_LAYOUT = 0x00001000; 1608 /** {@hide} */ 1609 static final int PFLAG_LAYOUT_REQUIRED = 0x00002000; 1610 1611 private static final int PFLAG_PRESSED = 0x00004000; 1612 1613 /** {@hide} */ 1614 static final int PFLAG_DRAWING_CACHE_VALID = 0x00008000; 1615 /** 1616 * Flag used to indicate that this view should be drawn once more (and only once 1617 * more) after its animation has completed. 1618 * {@hide} 1619 */ 1620 static final int PFLAG_ANIMATION_STARTED = 0x00010000; 1621 1622 private static final int PFLAG_SAVE_STATE_CALLED = 0x00020000; 1623 1624 /** 1625 * Indicates that the View returned true when onSetAlpha() was called and that 1626 * the alpha must be restored. 1627 * {@hide} 1628 */ 1629 static final int PFLAG_ALPHA_SET = 0x00040000; 1630 1631 /** 1632 * Set by {@link #setScrollContainer(boolean)}. 1633 */ 1634 static final int PFLAG_SCROLL_CONTAINER = 0x00080000; 1635 1636 /** 1637 * Set by {@link #setScrollContainer(boolean)}. 1638 */ 1639 static final int PFLAG_SCROLL_CONTAINER_ADDED = 0x00100000; 1640 1641 /** 1642 * View flag indicating whether this view was invalidated (fully or partially.) 1643 * 1644 * @hide 1645 */ 1646 static final int PFLAG_DIRTY = 0x00200000; 1647 1648 /** 1649 * View flag indicating whether this view was invalidated by an opaque 1650 * invalidate request. 1651 * 1652 * @hide 1653 */ 1654 static final int PFLAG_DIRTY_OPAQUE = 0x00400000; 1655 1656 /** 1657 * Mask for {@link #PFLAG_DIRTY} and {@link #PFLAG_DIRTY_OPAQUE}. 1658 * 1659 * @hide 1660 */ 1661 static final int PFLAG_DIRTY_MASK = 0x00600000; 1662 1663 /** 1664 * Indicates whether the background is opaque. 1665 * 1666 * @hide 1667 */ 1668 static final int PFLAG_OPAQUE_BACKGROUND = 0x00800000; 1669 1670 /** 1671 * Indicates whether the scrollbars are opaque. 1672 * 1673 * @hide 1674 */ 1675 static final int PFLAG_OPAQUE_SCROLLBARS = 0x01000000; 1676 1677 /** 1678 * Indicates whether the view is opaque. 1679 * 1680 * @hide 1681 */ 1682 static final int PFLAG_OPAQUE_MASK = 0x01800000; 1683 1684 /** 1685 * Indicates a prepressed state; 1686 * the short time between ACTION_DOWN and recognizing 1687 * a 'real' press. Prepressed is used to recognize quick taps 1688 * even when they are shorter than ViewConfiguration.getTapTimeout(). 1689 * 1690 * @hide 1691 */ 1692 private static final int PFLAG_PREPRESSED = 0x02000000; 1693 1694 /** 1695 * Indicates whether the view is temporarily detached. 1696 * 1697 * @hide 1698 */ 1699 static final int PFLAG_CANCEL_NEXT_UP_EVENT = 0x04000000; 1700 1701 /** 1702 * Indicates that we should awaken scroll bars once attached 1703 * 1704 * @hide 1705 */ 1706 private static final int PFLAG_AWAKEN_SCROLL_BARS_ON_ATTACH = 0x08000000; 1707 1708 /** 1709 * Indicates that the view has received HOVER_ENTER. Cleared on HOVER_EXIT. 1710 * @hide 1711 */ 1712 private static final int PFLAG_HOVERED = 0x10000000; 1713 1714 /** 1715 * Indicates that pivotX or pivotY were explicitly set and we should not assume the center 1716 * for transform operations 1717 * 1718 * @hide 1719 */ 1720 private static final int PFLAG_PIVOT_EXPLICITLY_SET = 0x20000000; 1721 1722 /** {@hide} */ 1723 static final int PFLAG_ACTIVATED = 0x40000000; 1724 1725 /** 1726 * Indicates that this view was specifically invalidated, not just dirtied because some 1727 * child view was invalidated. The flag is used to determine when we need to recreate 1728 * a view's display list (as opposed to just returning a reference to its existing 1729 * display list). 1730 * 1731 * @hide 1732 */ 1733 static final int PFLAG_INVALIDATED = 0x80000000; 1734 1735 /** 1736 * Masks for mPrivateFlags2, as generated by dumpFlags(): 1737 * 1738 * -------|-------|-------|-------| 1739 * PFLAG2_TEXT_ALIGNMENT_FLAGS[0] 1740 * PFLAG2_TEXT_DIRECTION_FLAGS[0] 1741 * 1 PFLAG2_DRAG_CAN_ACCEPT 1742 * 1 PFLAG2_DRAG_HOVERED 1743 * 1 PFLAG2_LAYOUT_DIRECTION_MASK_SHIFT 1744 * 11 PFLAG2_TEXT_DIRECTION_MASK_SHIFT 1745 * 1 1 PFLAG2_TEXT_DIRECTION_RESOLVED_MASK_SHIFT 1746 * 11 PFLAG2_LAYOUT_DIRECTION_MASK 1747 * 11 1 PFLAG2_TEXT_ALIGNMENT_MASK_SHIFT 1748 * 1 PFLAG2_LAYOUT_DIRECTION_RESOLVED_RTL 1749 * 1 1 PFLAG2_TEXT_ALIGNMENT_RESOLVED_MASK_SHIFT 1750 * 1 1 PFLAG2_IMPORTANT_FOR_ACCESSIBILITY_SHIFT 1751 * 1 PFLAG2_LAYOUT_DIRECTION_RESOLVED 1752 * 11 PFLAG2_LAYOUT_DIRECTION_RESOLVED_MASK 1753 * 1 PFLAG2_TEXT_DIRECTION_FLAGS[1] 1754 * 1 PFLAG2_TEXT_DIRECTION_FLAGS[2] 1755 * 11 PFLAG2_TEXT_DIRECTION_FLAGS[3] 1756 * 1 PFLAG2_TEXT_DIRECTION_FLAGS[4] 1757 * 1 1 PFLAG2_TEXT_DIRECTION_FLAGS[5] 1758 * 111 PFLAG2_TEXT_DIRECTION_MASK 1759 * 1 PFLAG2_TEXT_DIRECTION_RESOLVED 1760 * 1 PFLAG2_TEXT_DIRECTION_RESOLVED_DEFAULT 1761 * 111 PFLAG2_TEXT_DIRECTION_RESOLVED_MASK 1762 * 1 PFLAG2_TEXT_ALIGNMENT_FLAGS[1] 1763 * 1 PFLAG2_TEXT_ALIGNMENT_FLAGS[2] 1764 * 11 PFLAG2_TEXT_ALIGNMENT_FLAGS[3] 1765 * 1 PFLAG2_TEXT_ALIGNMENT_FLAGS[4] 1766 * 1 1 PFLAG2_TEXT_ALIGNMENT_FLAGS[5] 1767 * 11 PFLAG2_TEXT_ALIGNMENT_FLAGS[6] 1768 * 111 PFLAG2_TEXT_ALIGNMENT_MASK 1769 * 1 PFLAG2_TEXT_ALIGNMENT_RESOLVED 1770 * 1 PFLAG2_TEXT_ALIGNMENT_RESOLVED_DEFAULT 1771 * 111 PFLAG2_TEXT_ALIGNMENT_RESOLVED_MASK 1772 * 11 PFLAG2_IMPORTANT_FOR_ACCESSIBILITY_MASK 1773 * 1 PFLAG2_HAS_TRANSIENT_STATE 1774 * 1 PFLAG2_ACCESSIBILITY_FOCUSED 1775 * 1 PFLAG2_ACCESSIBILITY_STATE_CHANGED 1776 * 1 PFLAG2_VIEW_QUICK_REJECTED 1777 * 1 PFLAG2_PADDING_RESOLVED 1778 * -------|-------|-------|-------| 1779 */ 1780 1781 /** 1782 * Indicates that this view has reported that it can accept the current drag's content. 1783 * Cleared when the drag operation concludes. 1784 * @hide 1785 */ 1786 static final int PFLAG2_DRAG_CAN_ACCEPT = 0x00000001; 1787 1788 /** 1789 * Indicates that this view is currently directly under the drag location in a 1790 * drag-and-drop operation involving content that it can accept. Cleared when 1791 * the drag exits the view, or when the drag operation concludes. 1792 * @hide 1793 */ 1794 static final int PFLAG2_DRAG_HOVERED = 0x00000002; 1795 1796 /** 1797 * Horizontal layout direction of this view is from Left to Right. 1798 * Use with {@link #setLayoutDirection}. 1799 */ 1800 public static final int LAYOUT_DIRECTION_LTR = 0; 1801 1802 /** 1803 * Horizontal layout direction of this view is from Right to Left. 1804 * Use with {@link #setLayoutDirection}. 1805 */ 1806 public static final int LAYOUT_DIRECTION_RTL = 1; 1807 1808 /** 1809 * Horizontal layout direction of this view is inherited from its parent. 1810 * Use with {@link #setLayoutDirection}. 1811 */ 1812 public static final int LAYOUT_DIRECTION_INHERIT = 2; 1813 1814 /** 1815 * Horizontal layout direction of this view is from deduced from the default language 1816 * script for the locale. Use with {@link #setLayoutDirection}. 1817 */ 1818 public static final int LAYOUT_DIRECTION_LOCALE = 3; 1819 1820 /** 1821 * Bit shift to get the horizontal layout direction. (bits after DRAG_HOVERED) 1822 * @hide 1823 */ 1824 static final int PFLAG2_LAYOUT_DIRECTION_MASK_SHIFT = 2; 1825 1826 /** 1827 * Mask for use with private flags indicating bits used for horizontal layout direction. 1828 * @hide 1829 */ 1830 static final int PFLAG2_LAYOUT_DIRECTION_MASK = 0x00000003 << PFLAG2_LAYOUT_DIRECTION_MASK_SHIFT; 1831 1832 /** 1833 * Indicates whether the view horizontal layout direction has been resolved and drawn to the 1834 * right-to-left direction. 1835 * @hide 1836 */ 1837 static final int PFLAG2_LAYOUT_DIRECTION_RESOLVED_RTL = 4 << PFLAG2_LAYOUT_DIRECTION_MASK_SHIFT; 1838 1839 /** 1840 * Indicates whether the view horizontal layout direction has been resolved. 1841 * @hide 1842 */ 1843 static final int PFLAG2_LAYOUT_DIRECTION_RESOLVED = 8 << PFLAG2_LAYOUT_DIRECTION_MASK_SHIFT; 1844 1845 /** 1846 * Mask for use with private flags indicating bits used for resolved horizontal layout direction. 1847 * @hide 1848 */ 1849 static final int PFLAG2_LAYOUT_DIRECTION_RESOLVED_MASK = 0x0000000C 1850 << PFLAG2_LAYOUT_DIRECTION_MASK_SHIFT; 1851 1852 /* 1853 * Array of horizontal layout direction flags for mapping attribute "layoutDirection" to correct 1854 * flag value. 1855 * @hide 1856 */ 1857 private static final int[] LAYOUT_DIRECTION_FLAGS = { 1858 LAYOUT_DIRECTION_LTR, 1859 LAYOUT_DIRECTION_RTL, 1860 LAYOUT_DIRECTION_INHERIT, 1861 LAYOUT_DIRECTION_LOCALE 1862 }; 1863 1864 /** 1865 * Default horizontal layout direction. 1866 */ 1867 private static final int LAYOUT_DIRECTION_DEFAULT = LAYOUT_DIRECTION_INHERIT; 1868 1869 /** 1870 * Default horizontal layout direction. 1871 * @hide 1872 */ 1873 static final int LAYOUT_DIRECTION_RESOLVED_DEFAULT = LAYOUT_DIRECTION_LTR; 1874 1875 /** 1876 * Indicates that the view is tracking some sort of transient state 1877 * that the app should not need to be aware of, but that the framework 1878 * should take special care to preserve. 1879 * 1880 * @hide 1881 */ 1882 static final int PFLAG2_HAS_TRANSIENT_STATE = 0x1 << 22; 1883 1884 /** 1885 * Text direction is inherited thru {@link ViewGroup} 1886 */ 1887 public static final int TEXT_DIRECTION_INHERIT = 0; 1888 1889 /** 1890 * Text direction is using "first strong algorithm". The first strong directional character 1891 * determines the paragraph direction. If there is no strong directional character, the 1892 * paragraph direction is the view's resolved layout direction. 1893 */ 1894 public static final int TEXT_DIRECTION_FIRST_STRONG = 1; 1895 1896 /** 1897 * Text direction is using "any-RTL" algorithm. The paragraph direction is RTL if it contains 1898 * any strong RTL character, otherwise it is LTR if it contains any strong LTR characters. 1899 * If there are neither, the paragraph direction is the view's resolved layout direction. 1900 */ 1901 public static final int TEXT_DIRECTION_ANY_RTL = 2; 1902 1903 /** 1904 * Text direction is forced to LTR. 1905 */ 1906 public static final int TEXT_DIRECTION_LTR = 3; 1907 1908 /** 1909 * Text direction is forced to RTL. 1910 */ 1911 public static final int TEXT_DIRECTION_RTL = 4; 1912 1913 /** 1914 * Text direction is coming from the system Locale. 1915 */ 1916 public static final int TEXT_DIRECTION_LOCALE = 5; 1917 1918 /** 1919 * Default text direction is inherited 1920 */ 1921 private static final int TEXT_DIRECTION_DEFAULT = TEXT_DIRECTION_INHERIT; 1922 1923 /** 1924 * Default resolved text direction 1925 * @hide 1926 */ 1927 static final int TEXT_DIRECTION_RESOLVED_DEFAULT = TEXT_DIRECTION_FIRST_STRONG; 1928 1929 /** 1930 * Bit shift to get the horizontal layout direction. (bits after LAYOUT_DIRECTION_RESOLVED) 1931 * @hide 1932 */ 1933 static final int PFLAG2_TEXT_DIRECTION_MASK_SHIFT = 6; 1934 1935 /** 1936 * Mask for use with private flags indicating bits used for text direction. 1937 * @hide 1938 */ 1939 static final int PFLAG2_TEXT_DIRECTION_MASK = 0x00000007 1940 << PFLAG2_TEXT_DIRECTION_MASK_SHIFT; 1941 1942 /** 1943 * Array of text direction flags for mapping attribute "textDirection" to correct 1944 * flag value. 1945 * @hide 1946 */ 1947 private static final int[] PFLAG2_TEXT_DIRECTION_FLAGS = { 1948 TEXT_DIRECTION_INHERIT << PFLAG2_TEXT_DIRECTION_MASK_SHIFT, 1949 TEXT_DIRECTION_FIRST_STRONG << PFLAG2_TEXT_DIRECTION_MASK_SHIFT, 1950 TEXT_DIRECTION_ANY_RTL << PFLAG2_TEXT_DIRECTION_MASK_SHIFT, 1951 TEXT_DIRECTION_LTR << PFLAG2_TEXT_DIRECTION_MASK_SHIFT, 1952 TEXT_DIRECTION_RTL << PFLAG2_TEXT_DIRECTION_MASK_SHIFT, 1953 TEXT_DIRECTION_LOCALE << PFLAG2_TEXT_DIRECTION_MASK_SHIFT 1954 }; 1955 1956 /** 1957 * Indicates whether the view text direction has been resolved. 1958 * @hide 1959 */ 1960 static final int PFLAG2_TEXT_DIRECTION_RESOLVED = 0x00000008 1961 << PFLAG2_TEXT_DIRECTION_MASK_SHIFT; 1962 1963 /** 1964 * Bit shift to get the horizontal layout direction. (bits after DRAG_HOVERED) 1965 * @hide 1966 */ 1967 static final int PFLAG2_TEXT_DIRECTION_RESOLVED_MASK_SHIFT = 10; 1968 1969 /** 1970 * Mask for use with private flags indicating bits used for resolved text direction. 1971 * @hide 1972 */ 1973 static final int PFLAG2_TEXT_DIRECTION_RESOLVED_MASK = 0x00000007 1974 << PFLAG2_TEXT_DIRECTION_RESOLVED_MASK_SHIFT; 1975 1976 /** 1977 * Indicates whether the view text direction has been resolved to the "first strong" heuristic. 1978 * @hide 1979 */ 1980 static final int PFLAG2_TEXT_DIRECTION_RESOLVED_DEFAULT = 1981 TEXT_DIRECTION_RESOLVED_DEFAULT << PFLAG2_TEXT_DIRECTION_RESOLVED_MASK_SHIFT; 1982 1983 /* 1984 * Default text alignment. The text alignment of this View is inherited from its parent. 1985 * Use with {@link #setTextAlignment(int)} 1986 */ 1987 public static final int TEXT_ALIGNMENT_INHERIT = 0; 1988 1989 /** 1990 * Default for the root view. The gravity determines the text alignment, ALIGN_NORMAL, 1991 * ALIGN_CENTER, or ALIGN_OPPOSITE, which are relative to each paragraphs text direction. 1992 * 1993 * Use with {@link #setTextAlignment(int)} 1994 */ 1995 public static final int TEXT_ALIGNMENT_GRAVITY = 1; 1996 1997 /** 1998 * Align to the start of the paragraph, e.g. ALIGN_NORMAL. 1999 * 2000 * Use with {@link #setTextAlignment(int)} 2001 */ 2002 public static final int TEXT_ALIGNMENT_TEXT_START = 2; 2003 2004 /** 2005 * Align to the end of the paragraph, e.g. ALIGN_OPPOSITE. 2006 * 2007 * Use with {@link #setTextAlignment(int)} 2008 */ 2009 public static final int TEXT_ALIGNMENT_TEXT_END = 3; 2010 2011 /** 2012 * Center the paragraph, e.g. ALIGN_CENTER. 2013 * 2014 * Use with {@link #setTextAlignment(int)} 2015 */ 2016 public static final int TEXT_ALIGNMENT_CENTER = 4; 2017 2018 /** 2019 * Align to the start of the view, which is ALIGN_LEFT if the views resolved 2020 * layoutDirection is LTR, and ALIGN_RIGHT otherwise. 2021 * 2022 * Use with {@link #setTextAlignment(int)} 2023 */ 2024 public static final int TEXT_ALIGNMENT_VIEW_START = 5; 2025 2026 /** 2027 * Align to the end of the view, which is ALIGN_RIGHT if the views resolved 2028 * layoutDirection is LTR, and ALIGN_LEFT otherwise. 2029 * 2030 * Use with {@link #setTextAlignment(int)} 2031 */ 2032 public static final int TEXT_ALIGNMENT_VIEW_END = 6; 2033 2034 /** 2035 * Default text alignment is inherited 2036 */ 2037 private static final int TEXT_ALIGNMENT_DEFAULT = TEXT_ALIGNMENT_GRAVITY; 2038 2039 /** 2040 * Default resolved text alignment 2041 * @hide 2042 */ 2043 static final int TEXT_ALIGNMENT_RESOLVED_DEFAULT = TEXT_ALIGNMENT_GRAVITY; 2044 2045 /** 2046 * Bit shift to get the horizontal layout direction. (bits after DRAG_HOVERED) 2047 * @hide 2048 */ 2049 static final int PFLAG2_TEXT_ALIGNMENT_MASK_SHIFT = 13; 2050 2051 /** 2052 * Mask for use with private flags indicating bits used for text alignment. 2053 * @hide 2054 */ 2055 static final int PFLAG2_TEXT_ALIGNMENT_MASK = 0x00000007 << PFLAG2_TEXT_ALIGNMENT_MASK_SHIFT; 2056 2057 /** 2058 * Array of text direction flags for mapping attribute "textAlignment" to correct 2059 * flag value. 2060 * @hide 2061 */ 2062 private static final int[] PFLAG2_TEXT_ALIGNMENT_FLAGS = { 2063 TEXT_ALIGNMENT_INHERIT << PFLAG2_TEXT_ALIGNMENT_MASK_SHIFT, 2064 TEXT_ALIGNMENT_GRAVITY << PFLAG2_TEXT_ALIGNMENT_MASK_SHIFT, 2065 TEXT_ALIGNMENT_TEXT_START << PFLAG2_TEXT_ALIGNMENT_MASK_SHIFT, 2066 TEXT_ALIGNMENT_TEXT_END << PFLAG2_TEXT_ALIGNMENT_MASK_SHIFT, 2067 TEXT_ALIGNMENT_CENTER << PFLAG2_TEXT_ALIGNMENT_MASK_SHIFT, 2068 TEXT_ALIGNMENT_VIEW_START << PFLAG2_TEXT_ALIGNMENT_MASK_SHIFT, 2069 TEXT_ALIGNMENT_VIEW_END << PFLAG2_TEXT_ALIGNMENT_MASK_SHIFT 2070 }; 2071 2072 /** 2073 * Indicates whether the view text alignment has been resolved. 2074 * @hide 2075 */ 2076 static final int PFLAG2_TEXT_ALIGNMENT_RESOLVED = 0x00000008 << PFLAG2_TEXT_ALIGNMENT_MASK_SHIFT; 2077 2078 /** 2079 * Bit shift to get the resolved text alignment. 2080 * @hide 2081 */ 2082 static final int PFLAG2_TEXT_ALIGNMENT_RESOLVED_MASK_SHIFT = 17; 2083 2084 /** 2085 * Mask for use with private flags indicating bits used for text alignment. 2086 * @hide 2087 */ 2088 static final int PFLAG2_TEXT_ALIGNMENT_RESOLVED_MASK = 0x00000007 2089 << PFLAG2_TEXT_ALIGNMENT_RESOLVED_MASK_SHIFT; 2090 2091 /** 2092 * Indicates whether if the view text alignment has been resolved to gravity 2093 */ 2094 private static final int PFLAG2_TEXT_ALIGNMENT_RESOLVED_DEFAULT = 2095 TEXT_ALIGNMENT_RESOLVED_DEFAULT << PFLAG2_TEXT_ALIGNMENT_RESOLVED_MASK_SHIFT; 2096 2097 // Accessiblity constants for mPrivateFlags2 2098 2099 /** 2100 * Shift for the bits in {@link #mPrivateFlags2} related to the 2101 * "importantForAccessibility" attribute. 2102 */ 2103 static final int PFLAG2_IMPORTANT_FOR_ACCESSIBILITY_SHIFT = 20; 2104 2105 /** 2106 * Automatically determine whether a view is important for accessibility. 2107 */ 2108 public static final int IMPORTANT_FOR_ACCESSIBILITY_AUTO = 0x00000000; 2109 2110 /** 2111 * The view is important for accessibility. 2112 */ 2113 public static final int IMPORTANT_FOR_ACCESSIBILITY_YES = 0x00000001; 2114 2115 /** 2116 * The view is not important for accessibility. 2117 */ 2118 public static final int IMPORTANT_FOR_ACCESSIBILITY_NO = 0x00000002; 2119 2120 /** 2121 * The default whether the view is important for accessibility. 2122 */ 2123 static final int IMPORTANT_FOR_ACCESSIBILITY_DEFAULT = IMPORTANT_FOR_ACCESSIBILITY_AUTO; 2124 2125 /** 2126 * Mask for obtainig the bits which specify how to determine 2127 * whether a view is important for accessibility. 2128 */ 2129 static final int PFLAG2_IMPORTANT_FOR_ACCESSIBILITY_MASK = (IMPORTANT_FOR_ACCESSIBILITY_AUTO 2130 | IMPORTANT_FOR_ACCESSIBILITY_YES | IMPORTANT_FOR_ACCESSIBILITY_NO) 2131 << PFLAG2_IMPORTANT_FOR_ACCESSIBILITY_SHIFT; 2132 2133 /** 2134 * Flag indicating whether a view has accessibility focus. 2135 */ 2136 static final int PFLAG2_ACCESSIBILITY_FOCUSED = 0x00000040 << PFLAG2_IMPORTANT_FOR_ACCESSIBILITY_SHIFT; 2137 2138 /** 2139 * Flag indicating whether a view state for accessibility has changed. 2140 */ 2141 static final int PFLAG2_ACCESSIBILITY_STATE_CHANGED = 0x00000080 2142 << PFLAG2_IMPORTANT_FOR_ACCESSIBILITY_SHIFT; 2143 2144 /** 2145 * Flag indicating whether a view failed the quickReject() check in draw(). This condition 2146 * is used to check whether later changes to the view's transform should invalidate the 2147 * view to force the quickReject test to run again. 2148 */ 2149 static final int PFLAG2_VIEW_QUICK_REJECTED = 0x10000000; 2150 2151 /** 2152 * Flag indicating that start/end padding has been resolved into left/right padding 2153 * for use in measurement, layout, drawing, etc. This is set by {@link #resolvePadding()} 2154 * and checked by {@link #measure(int, int)} to determine if padding needs to be resolved 2155 * during measurement. In some special cases this is required such as when an adapter-based 2156 * view measures prospective children without attaching them to a window. 2157 */ 2158 static final int PFLAG2_PADDING_RESOLVED = 0x20000000; 2159 2160 /** 2161 * Flag indicating that the start/end drawables has been resolved into left/right ones. 2162 */ 2163 static final int PFLAG2_DRAWABLE_RESOLVED = 0x40000000; 2164 2165 /** 2166 * Group of bits indicating that RTL properties resolution is done. 2167 */ 2168 static final int ALL_RTL_PROPERTIES_RESOLVED = PFLAG2_LAYOUT_DIRECTION_RESOLVED | 2169 PFLAG2_TEXT_DIRECTION_RESOLVED | 2170 PFLAG2_TEXT_ALIGNMENT_RESOLVED | 2171 PFLAG2_PADDING_RESOLVED | 2172 PFLAG2_DRAWABLE_RESOLVED; 2173 2174 // There are a couple of flags left in mPrivateFlags2 2175 2176 /* End of masks for mPrivateFlags2 */ 2177 2178 /* Masks for mPrivateFlags3 */ 2179 2180 /** 2181 * Flag indicating that view has a transform animation set on it. This is used to track whether 2182 * an animation is cleared between successive frames, in order to tell the associated 2183 * DisplayList to clear its animation matrix. 2184 */ 2185 static final int PFLAG3_VIEW_IS_ANIMATING_TRANSFORM = 0x1; 2186 2187 /** 2188 * Flag indicating that view has an alpha animation set on it. This is used to track whether an 2189 * animation is cleared between successive frames, in order to tell the associated 2190 * DisplayList to restore its alpha value. 2191 */ 2192 static final int PFLAG3_VIEW_IS_ANIMATING_ALPHA = 0x2; 2193 2194 2195 /* End of masks for mPrivateFlags3 */ 2196 2197 static final int DRAG_MASK = PFLAG2_DRAG_CAN_ACCEPT | PFLAG2_DRAG_HOVERED; 2198 2199 /** 2200 * Always allow a user to over-scroll this view, provided it is a 2201 * view that can scroll. 2202 * 2203 * @see #getOverScrollMode() 2204 * @see #setOverScrollMode(int) 2205 */ 2206 public static final int OVER_SCROLL_ALWAYS = 0; 2207 2208 /** 2209 * Allow a user to over-scroll this view only if the content is large 2210 * enough to meaningfully scroll, provided it is a view that can scroll. 2211 * 2212 * @see #getOverScrollMode() 2213 * @see #setOverScrollMode(int) 2214 */ 2215 public static final int OVER_SCROLL_IF_CONTENT_SCROLLS = 1; 2216 2217 /** 2218 * Never allow a user to over-scroll this view. 2219 * 2220 * @see #getOverScrollMode() 2221 * @see #setOverScrollMode(int) 2222 */ 2223 public static final int OVER_SCROLL_NEVER = 2; 2224 2225 /** 2226 * Special constant for {@link #setSystemUiVisibility(int)}: View has 2227 * requested the system UI (status bar) to be visible (the default). 2228 * 2229 * @see #setSystemUiVisibility(int) 2230 */ 2231 public static final int SYSTEM_UI_FLAG_VISIBLE = 0; 2232 2233 /** 2234 * Flag for {@link #setSystemUiVisibility(int)}: View has requested the 2235 * system UI to enter an unobtrusive "low profile" mode. 2236 * 2237 * <p>This is for use in games, book readers, video players, or any other 2238 * "immersive" application where the usual system chrome is deemed too distracting. 2239 * 2240 * <p>In low profile mode, the status bar and/or navigation icons may dim. 2241 * 2242 * @see #setSystemUiVisibility(int) 2243 */ 2244 public static final int SYSTEM_UI_FLAG_LOW_PROFILE = 0x00000001; 2245 2246 /** 2247 * Flag for {@link #setSystemUiVisibility(int)}: View has requested that the 2248 * system navigation be temporarily hidden. 2249 * 2250 * <p>This is an even less obtrusive state than that called for by 2251 * {@link #SYSTEM_UI_FLAG_LOW_PROFILE}; on devices that draw essential navigation controls 2252 * (Home, Back, and the like) on screen, <code>SYSTEM_UI_FLAG_HIDE_NAVIGATION</code> will cause 2253 * those to disappear. This is useful (in conjunction with the 2254 * {@link android.view.WindowManager.LayoutParams#FLAG_FULLSCREEN FLAG_FULLSCREEN} and 2255 * {@link android.view.WindowManager.LayoutParams#FLAG_LAYOUT_IN_SCREEN FLAG_LAYOUT_IN_SCREEN} 2256 * window flags) for displaying content using every last pixel on the display. 2257 * 2258 * <p>There is a limitation: because navigation controls are so important, the least user 2259 * interaction will cause them to reappear immediately. When this happens, both 2260 * this flag and {@link #SYSTEM_UI_FLAG_FULLSCREEN} will be cleared automatically, 2261 * so that both elements reappear at the same time. 2262 * 2263 * @see #setSystemUiVisibility(int) 2264 */ 2265 public static final int SYSTEM_UI_FLAG_HIDE_NAVIGATION = 0x00000002; 2266 2267 /** 2268 * Flag for {@link #setSystemUiVisibility(int)}: View has requested to go 2269 * into the normal fullscreen mode so that its content can take over the screen 2270 * while still allowing the user to interact with the application. 2271 * 2272 * <p>This has the same visual effect as 2273 * {@link android.view.WindowManager.LayoutParams#FLAG_FULLSCREEN 2274 * WindowManager.LayoutParams.FLAG_FULLSCREEN}, 2275 * meaning that non-critical screen decorations (such as the status bar) will be 2276 * hidden while the user is in the View's window, focusing the experience on 2277 * that content. Unlike the window flag, if you are using ActionBar in 2278 * overlay mode with {@link Window#FEATURE_ACTION_BAR_OVERLAY 2279 * Window.FEATURE_ACTION_BAR_OVERLAY}, then enabling this flag will also 2280 * hide the action bar. 2281 * 2282 * <p>This approach to going fullscreen is best used over the window flag when 2283 * it is a transient state -- that is, the application does this at certain 2284 * points in its user interaction where it wants to allow the user to focus 2285 * on content, but not as a continuous state. For situations where the application 2286 * would like to simply stay full screen the entire time (such as a game that 2287 * wants to take over the screen), the 2288 * {@link android.view.WindowManager.LayoutParams#FLAG_FULLSCREEN window flag} 2289 * is usually a better approach. The state set here will be removed by the system 2290 * in various situations (such as the user moving to another application) like 2291 * the other system UI states. 2292 * 2293 * <p>When using this flag, the application should provide some easy facility 2294 * for the user to go out of it. A common example would be in an e-book 2295 * reader, where tapping on the screen brings back whatever screen and UI 2296 * decorations that had been hidden while the user was immersed in reading 2297 * the book. 2298 * 2299 * @see #setSystemUiVisibility(int) 2300 */ 2301 public static final int SYSTEM_UI_FLAG_FULLSCREEN = 0x00000004; 2302 2303 /** 2304 * Flag for {@link #setSystemUiVisibility(int)}: When using other layout 2305 * flags, we would like a stable view of the content insets given to 2306 * {@link #fitSystemWindows(Rect)}. This means that the insets seen there 2307 * will always represent the worst case that the application can expect 2308 * as a continuous state. In the stock Android UI this is the space for 2309 * the system bar, nav bar, and status bar, but not more transient elements 2310 * such as an input method. 2311 * 2312 * The stable layout your UI sees is based on the system UI modes you can 2313 * switch to. That is, if you specify {@link #SYSTEM_UI_FLAG_LAYOUT_FULLSCREEN} 2314 * then you will get a stable layout for changes of the 2315 * {@link #SYSTEM_UI_FLAG_FULLSCREEN} mode; if you specify 2316 * {@link #SYSTEM_UI_FLAG_LAYOUT_FULLSCREEN} and 2317 * {@link #SYSTEM_UI_FLAG_LAYOUT_HIDE_NAVIGATION}, then you can transition 2318 * to {@link #SYSTEM_UI_FLAG_FULLSCREEN} and {@link #SYSTEM_UI_FLAG_HIDE_NAVIGATION} 2319 * with a stable layout. (Note that you should avoid using 2320 * {@link #SYSTEM_UI_FLAG_LAYOUT_HIDE_NAVIGATION} by itself.) 2321 * 2322 * If you have set the window flag {@link WindowManager.LayoutParams#FLAG_FULLSCREEN} 2323 * to hide the status bar (instead of using {@link #SYSTEM_UI_FLAG_FULLSCREEN}), 2324 * then a hidden status bar will be considered a "stable" state for purposes 2325 * here. This allows your UI to continually hide the status bar, while still 2326 * using the system UI flags to hide the action bar while still retaining 2327 * a stable layout. Note that changing the window fullscreen flag will never 2328 * provide a stable layout for a clean transition. 2329 * 2330 * <p>If you are using ActionBar in 2331 * overlay mode with {@link Window#FEATURE_ACTION_BAR_OVERLAY 2332 * Window.FEATURE_ACTION_BAR_OVERLAY}, this flag will also impact the 2333 * insets it adds to those given to the application. 2334 */ 2335 public static final int SYSTEM_UI_FLAG_LAYOUT_STABLE = 0x00000100; 2336 2337 /** 2338 * Flag for {@link #setSystemUiVisibility(int)}: View would like its window 2339 * to be layed out as if it has requested 2340 * {@link #SYSTEM_UI_FLAG_HIDE_NAVIGATION}, even if it currently hasn't. This 2341 * allows it to avoid artifacts when switching in and out of that mode, at 2342 * the expense that some of its user interface may be covered by screen 2343 * decorations when they are shown. You can perform layout of your inner 2344 * UI elements to account for the navagation system UI through the 2345 * {@link #fitSystemWindows(Rect)} method. 2346 */ 2347 public static final int SYSTEM_UI_FLAG_LAYOUT_HIDE_NAVIGATION = 0x00000200; 2348 2349 /** 2350 * Flag for {@link #setSystemUiVisibility(int)}: View would like its window 2351 * to be layed out as if it has requested 2352 * {@link #SYSTEM_UI_FLAG_FULLSCREEN}, even if it currently hasn't. This 2353 * allows it to avoid artifacts when switching in and out of that mode, at 2354 * the expense that some of its user interface may be covered by screen 2355 * decorations when they are shown. You can perform layout of your inner 2356 * UI elements to account for non-fullscreen system UI through the 2357 * {@link #fitSystemWindows(Rect)} method. 2358 */ 2359 public static final int SYSTEM_UI_FLAG_LAYOUT_FULLSCREEN = 0x00000400; 2360 2361 /** 2362 * @deprecated Use {@link #SYSTEM_UI_FLAG_LOW_PROFILE} instead. 2363 */ 2364 public static final int STATUS_BAR_HIDDEN = SYSTEM_UI_FLAG_LOW_PROFILE; 2365 2366 /** 2367 * @deprecated Use {@link #SYSTEM_UI_FLAG_VISIBLE} instead. 2368 */ 2369 public static final int STATUS_BAR_VISIBLE = SYSTEM_UI_FLAG_VISIBLE; 2370 2371 /** 2372 * @hide 2373 * 2374 * NOTE: This flag may only be used in subtreeSystemUiVisibility. It is masked 2375 * out of the public fields to keep the undefined bits out of the developer's way. 2376 * 2377 * Flag to make the status bar not expandable. Unless you also 2378 * set {@link #STATUS_BAR_DISABLE_NOTIFICATION_ICONS}, new notifications will continue to show. 2379 */ 2380 public static final int STATUS_BAR_DISABLE_EXPAND = 0x00010000; 2381 2382 /** 2383 * @hide 2384 * 2385 * NOTE: This flag may only be used in subtreeSystemUiVisibility. It is masked 2386 * out of the public fields to keep the undefined bits out of the developer's way. 2387 * 2388 * Flag to hide notification icons and scrolling ticker text. 2389 */ 2390 public static final int STATUS_BAR_DISABLE_NOTIFICATION_ICONS = 0x00020000; 2391 2392 /** 2393 * @hide 2394 * 2395 * NOTE: This flag may only be used in subtreeSystemUiVisibility. It is masked 2396 * out of the public fields to keep the undefined bits out of the developer's way. 2397 * 2398 * Flag to disable incoming notification alerts. This will not block 2399 * icons, but it will block sound, vibrating and other visual or aural notifications. 2400 */ 2401 public static final int STATUS_BAR_DISABLE_NOTIFICATION_ALERTS = 0x00040000; 2402 2403 /** 2404 * @hide 2405 * 2406 * NOTE: This flag may only be used in subtreeSystemUiVisibility. It is masked 2407 * out of the public fields to keep the undefined bits out of the developer's way. 2408 * 2409 * Flag to hide only the scrolling ticker. Note that 2410 * {@link #STATUS_BAR_DISABLE_NOTIFICATION_ICONS} implies 2411 * {@link #STATUS_BAR_DISABLE_NOTIFICATION_TICKER}. 2412 */ 2413 public static final int STATUS_BAR_DISABLE_NOTIFICATION_TICKER = 0x00080000; 2414 2415 /** 2416 * @hide 2417 * 2418 * NOTE: This flag may only be used in subtreeSystemUiVisibility. It is masked 2419 * out of the public fields to keep the undefined bits out of the developer's way. 2420 * 2421 * Flag to hide the center system info area. 2422 */ 2423 public static final int STATUS_BAR_DISABLE_SYSTEM_INFO = 0x00100000; 2424 2425 /** 2426 * @hide 2427 * 2428 * NOTE: This flag may only be used in subtreeSystemUiVisibility. It is masked 2429 * out of the public fields to keep the undefined bits out of the developer's way. 2430 * 2431 * Flag to hide only the home button. Don't use this 2432 * unless you're a special part of the system UI (i.e., setup wizard, keyguard). 2433 */ 2434 public static final int STATUS_BAR_DISABLE_HOME = 0x00200000; 2435 2436 /** 2437 * @hide 2438 * 2439 * NOTE: This flag may only be used in subtreeSystemUiVisibility. It is masked 2440 * out of the public fields to keep the undefined bits out of the developer's way. 2441 * 2442 * Flag to hide only the back button. Don't use this 2443 * unless you're a special part of the system UI (i.e., setup wizard, keyguard). 2444 */ 2445 public static final int STATUS_BAR_DISABLE_BACK = 0x00400000; 2446 2447 /** 2448 * @hide 2449 * 2450 * NOTE: This flag may only be used in subtreeSystemUiVisibility. It is masked 2451 * out of the public fields to keep the undefined bits out of the developer's way. 2452 * 2453 * Flag to hide only the clock. You might use this if your activity has 2454 * its own clock making the status bar's clock redundant. 2455 */ 2456 public static final int STATUS_BAR_DISABLE_CLOCK = 0x00800000; 2457 2458 /** 2459 * @hide 2460 * 2461 * NOTE: This flag may only be used in subtreeSystemUiVisibility. It is masked 2462 * out of the public fields to keep the undefined bits out of the developer's way. 2463 * 2464 * Flag to hide only the recent apps button. Don't use this 2465 * unless you're a special part of the system UI (i.e., setup wizard, keyguard). 2466 */ 2467 public static final int STATUS_BAR_DISABLE_RECENT = 0x01000000; 2468 2469 /** 2470 * @hide 2471 * 2472 * NOTE: This flag may only be used in subtreeSystemUiVisibility. It is masked 2473 * out of the public fields to keep the undefined bits out of the developer's way. 2474 * 2475 * Flag to disable the global search gesture. Don't use this 2476 * unless you're a special part of the system UI (i.e., setup wizard, keyguard). 2477 */ 2478 public static final int STATUS_BAR_DISABLE_SEARCH = 0x02000000; 2479 2480 /** 2481 * @hide 2482 */ 2483 public static final int PUBLIC_STATUS_BAR_VISIBILITY_MASK = 0x0000FFFF; 2484 2485 /** 2486 * These are the system UI flags that can be cleared by events outside 2487 * of an application. Currently this is just the ability to tap on the 2488 * screen while hiding the navigation bar to have it return. 2489 * @hide 2490 */ 2491 public static final int SYSTEM_UI_CLEARABLE_FLAGS = 2492 SYSTEM_UI_FLAG_LOW_PROFILE | SYSTEM_UI_FLAG_HIDE_NAVIGATION 2493 | SYSTEM_UI_FLAG_FULLSCREEN; 2494 2495 /** 2496 * Flags that can impact the layout in relation to system UI. 2497 */ 2498 public static final int SYSTEM_UI_LAYOUT_FLAGS = 2499 SYSTEM_UI_FLAG_LAYOUT_HIDE_NAVIGATION 2500 | SYSTEM_UI_FLAG_LAYOUT_FULLSCREEN; 2501 2502 /** 2503 * Find views that render the specified text. 2504 * 2505 * @see #findViewsWithText(ArrayList, CharSequence, int) 2506 */ 2507 public static final int FIND_VIEWS_WITH_TEXT = 0x00000001; 2508 2509 /** 2510 * Find find views that contain the specified content description. 2511 * 2512 * @see #findViewsWithText(ArrayList, CharSequence, int) 2513 */ 2514 public static final int FIND_VIEWS_WITH_CONTENT_DESCRIPTION = 0x00000002; 2515 2516 /** 2517 * Find views that contain {@link AccessibilityNodeProvider}. Such 2518 * a View is a root of virtual view hierarchy and may contain the searched 2519 * text. If this flag is set Views with providers are automatically 2520 * added and it is a responsibility of the client to call the APIs of 2521 * the provider to determine whether the virtual tree rooted at this View 2522 * contains the text, i.e. getting the list of {@link AccessibilityNodeInfo}s 2523 * represeting the virtual views with this text. 2524 * 2525 * @see #findViewsWithText(ArrayList, CharSequence, int) 2526 * 2527 * @hide 2528 */ 2529 public static final int FIND_VIEWS_WITH_ACCESSIBILITY_NODE_PROVIDERS = 0x00000004; 2530 2531 /** 2532 * The undefined cursor position. 2533 * 2534 * @hide 2535 */ 2536 public static final int ACCESSIBILITY_CURSOR_POSITION_UNDEFINED = -1; 2537 2538 /** 2539 * Indicates that the screen has changed state and is now off. 2540 * 2541 * @see #onScreenStateChanged(int) 2542 */ 2543 public static final int SCREEN_STATE_OFF = 0x0; 2544 2545 /** 2546 * Indicates that the screen has changed state and is now on. 2547 * 2548 * @see #onScreenStateChanged(int) 2549 */ 2550 public static final int SCREEN_STATE_ON = 0x1; 2551 2552 /** 2553 * Controls the over-scroll mode for this view. 2554 * See {@link #overScrollBy(int, int, int, int, int, int, int, int, boolean)}, 2555 * {@link #OVER_SCROLL_ALWAYS}, {@link #OVER_SCROLL_IF_CONTENT_SCROLLS}, 2556 * and {@link #OVER_SCROLL_NEVER}. 2557 */ 2558 private int mOverScrollMode; 2559 2560 /** 2561 * The parent this view is attached to. 2562 * {@hide} 2563 * 2564 * @see #getParent() 2565 */ 2566 protected ViewParent mParent; 2567 2568 /** 2569 * {@hide} 2570 */ 2571 AttachInfo mAttachInfo; 2572 2573 /** 2574 * {@hide} 2575 */ 2576 @ViewDebug.ExportedProperty(flagMapping = { 2577 @ViewDebug.FlagToString(mask = PFLAG_FORCE_LAYOUT, equals = PFLAG_FORCE_LAYOUT, 2578 name = "FORCE_LAYOUT"), 2579 @ViewDebug.FlagToString(mask = PFLAG_LAYOUT_REQUIRED, equals = PFLAG_LAYOUT_REQUIRED, 2580 name = "LAYOUT_REQUIRED"), 2581 @ViewDebug.FlagToString(mask = PFLAG_DRAWING_CACHE_VALID, equals = PFLAG_DRAWING_CACHE_VALID, 2582 name = "DRAWING_CACHE_INVALID", outputIf = false), 2583 @ViewDebug.FlagToString(mask = PFLAG_DRAWN, equals = PFLAG_DRAWN, name = "DRAWN", outputIf = true), 2584 @ViewDebug.FlagToString(mask = PFLAG_DRAWN, equals = PFLAG_DRAWN, name = "NOT_DRAWN", outputIf = false), 2585 @ViewDebug.FlagToString(mask = PFLAG_DIRTY_MASK, equals = PFLAG_DIRTY_OPAQUE, name = "DIRTY_OPAQUE"), 2586 @ViewDebug.FlagToString(mask = PFLAG_DIRTY_MASK, equals = PFLAG_DIRTY, name = "DIRTY") 2587 }) 2588 int mPrivateFlags; 2589 int mPrivateFlags2; 2590 int mPrivateFlags3; 2591 2592 /** 2593 * This view's request for the visibility of the status bar. 2594 * @hide 2595 */ 2596 @ViewDebug.ExportedProperty(flagMapping = { 2597 @ViewDebug.FlagToString(mask = SYSTEM_UI_FLAG_LOW_PROFILE, 2598 equals = SYSTEM_UI_FLAG_LOW_PROFILE, 2599 name = "SYSTEM_UI_FLAG_LOW_PROFILE", outputIf = true), 2600 @ViewDebug.FlagToString(mask = SYSTEM_UI_FLAG_HIDE_NAVIGATION, 2601 equals = SYSTEM_UI_FLAG_HIDE_NAVIGATION, 2602 name = "SYSTEM_UI_FLAG_HIDE_NAVIGATION", outputIf = true), 2603 @ViewDebug.FlagToString(mask = PUBLIC_STATUS_BAR_VISIBILITY_MASK, 2604 equals = SYSTEM_UI_FLAG_VISIBLE, 2605 name = "SYSTEM_UI_FLAG_VISIBLE", outputIf = true) 2606 }) 2607 int mSystemUiVisibility; 2608 2609 /** 2610 * Reference count for transient state. 2611 * @see #setHasTransientState(boolean) 2612 */ 2613 int mTransientStateCount = 0; 2614 2615 /** 2616 * Count of how many windows this view has been attached to. 2617 */ 2618 int mWindowAttachCount; 2619 2620 /** 2621 * The layout parameters associated with this view and used by the parent 2622 * {@link android.view.ViewGroup} to determine how this view should be 2623 * laid out. 2624 * {@hide} 2625 */ 2626 protected ViewGroup.LayoutParams mLayoutParams; 2627 2628 /** 2629 * The view flags hold various views states. 2630 * {@hide} 2631 */ 2632 @ViewDebug.ExportedProperty 2633 int mViewFlags; 2634 2635 static class TransformationInfo { 2636 /** 2637 * The transform matrix for the View. This transform is calculated internally 2638 * based on the rotation, scaleX, and scaleY properties. The identity matrix 2639 * is used by default. Do *not* use this variable directly; instead call 2640 * getMatrix(), which will automatically recalculate the matrix if necessary 2641 * to get the correct matrix based on the latest rotation and scale properties. 2642 */ 2643 private final Matrix mMatrix = new Matrix(); 2644 2645 /** 2646 * The transform matrix for the View. This transform is calculated internally 2647 * based on the rotation, scaleX, and scaleY properties. The identity matrix 2648 * is used by default. Do *not* use this variable directly; instead call 2649 * getInverseMatrix(), which will automatically recalculate the matrix if necessary 2650 * to get the correct matrix based on the latest rotation and scale properties. 2651 */ 2652 private Matrix mInverseMatrix; 2653 2654 /** 2655 * An internal variable that tracks whether we need to recalculate the 2656 * transform matrix, based on whether the rotation or scaleX/Y properties 2657 * have changed since the matrix was last calculated. 2658 */ 2659 boolean mMatrixDirty = false; 2660 2661 /** 2662 * An internal variable that tracks whether we need to recalculate the 2663 * transform matrix, based on whether the rotation or scaleX/Y properties 2664 * have changed since the matrix was last calculated. 2665 */ 2666 private boolean mInverseMatrixDirty = true; 2667 2668 /** 2669 * A variable that tracks whether we need to recalculate the 2670 * transform matrix, based on whether the rotation or scaleX/Y properties 2671 * have changed since the matrix was last calculated. This variable 2672 * is only valid after a call to updateMatrix() or to a function that 2673 * calls it such as getMatrix(), hasIdentityMatrix() and getInverseMatrix(). 2674 */ 2675 private boolean mMatrixIsIdentity = true; 2676 2677 /** 2678 * The Camera object is used to compute a 3D matrix when rotationX or rotationY are set. 2679 */ 2680 private Camera mCamera = null; 2681 2682 /** 2683 * This matrix is used when computing the matrix for 3D rotations. 2684 */ 2685 private Matrix matrix3D = null; 2686 2687 /** 2688 * These prev values are used to recalculate a centered pivot point when necessary. The 2689 * pivot point is only used in matrix operations (when rotation, scale, or translation are 2690 * set), so thes values are only used then as well. 2691 */ 2692 private int mPrevWidth = -1; 2693 private int mPrevHeight = -1; 2694 2695 /** 2696 * The degrees rotation around the vertical axis through the pivot point. 2697 */ 2698 @ViewDebug.ExportedProperty 2699 float mRotationY = 0f; 2700 2701 /** 2702 * The degrees rotation around the horizontal axis through the pivot point. 2703 */ 2704 @ViewDebug.ExportedProperty 2705 float mRotationX = 0f; 2706 2707 /** 2708 * The degrees rotation around the pivot point. 2709 */ 2710 @ViewDebug.ExportedProperty 2711 float mRotation = 0f; 2712 2713 /** 2714 * The amount of translation of the object away from its left property (post-layout). 2715 */ 2716 @ViewDebug.ExportedProperty 2717 float mTranslationX = 0f; 2718 2719 /** 2720 * The amount of translation of the object away from its top property (post-layout). 2721 */ 2722 @ViewDebug.ExportedProperty 2723 float mTranslationY = 0f; 2724 2725 /** 2726 * The amount of scale in the x direction around the pivot point. A 2727 * value of 1 means no scaling is applied. 2728 */ 2729 @ViewDebug.ExportedProperty 2730 float mScaleX = 1f; 2731 2732 /** 2733 * The amount of scale in the y direction around the pivot point. A 2734 * value of 1 means no scaling is applied. 2735 */ 2736 @ViewDebug.ExportedProperty 2737 float mScaleY = 1f; 2738 2739 /** 2740 * The x location of the point around which the view is rotated and scaled. 2741 */ 2742 @ViewDebug.ExportedProperty 2743 float mPivotX = 0f; 2744 2745 /** 2746 * The y location of the point around which the view is rotated and scaled. 2747 */ 2748 @ViewDebug.ExportedProperty 2749 float mPivotY = 0f; 2750 2751 /** 2752 * The opacity of the View. This is a value from 0 to 1, where 0 means 2753 * completely transparent and 1 means completely opaque. 2754 */ 2755 @ViewDebug.ExportedProperty 2756 float mAlpha = 1f; 2757 } 2758 2759 TransformationInfo mTransformationInfo; 2760 2761 /** 2762 * Current clip bounds. to which all drawing of this view are constrained. 2763 */ 2764 private Rect mClipBounds = null; 2765 2766 private boolean mLastIsOpaque; 2767 2768 /** 2769 * Convenience value to check for float values that are close enough to zero to be considered 2770 * zero. 2771 */ 2772 private static final float NONZERO_EPSILON = .001f; 2773 2774 /** 2775 * The distance in pixels from the left edge of this view's parent 2776 * to the left edge of this view. 2777 * {@hide} 2778 */ 2779 @ViewDebug.ExportedProperty(category = "layout") 2780 protected int mLeft; 2781 /** 2782 * The distance in pixels from the left edge of this view's parent 2783 * to the right edge of this view. 2784 * {@hide} 2785 */ 2786 @ViewDebug.ExportedProperty(category = "layout") 2787 protected int mRight; 2788 /** 2789 * The distance in pixels from the top edge of this view's parent 2790 * to the top edge of this view. 2791 * {@hide} 2792 */ 2793 @ViewDebug.ExportedProperty(category = "layout") 2794 protected int mTop; 2795 /** 2796 * The distance in pixels from the top edge of this view's parent 2797 * to the bottom edge of this view. 2798 * {@hide} 2799 */ 2800 @ViewDebug.ExportedProperty(category = "layout") 2801 protected int mBottom; 2802 2803 /** 2804 * The offset, in pixels, by which the content of this view is scrolled 2805 * horizontally. 2806 * {@hide} 2807 */ 2808 @ViewDebug.ExportedProperty(category = "scrolling") 2809 protected int mScrollX; 2810 /** 2811 * The offset, in pixels, by which the content of this view is scrolled 2812 * vertically. 2813 * {@hide} 2814 */ 2815 @ViewDebug.ExportedProperty(category = "scrolling") 2816 protected int mScrollY; 2817 2818 /** 2819 * The left padding in pixels, that is the distance in pixels between the 2820 * left edge of this view and the left edge of its content. 2821 * {@hide} 2822 */ 2823 @ViewDebug.ExportedProperty(category = "padding") 2824 protected int mPaddingLeft = 0; 2825 /** 2826 * The right padding in pixels, that is the distance in pixels between the 2827 * right edge of this view and the right edge of its content. 2828 * {@hide} 2829 */ 2830 @ViewDebug.ExportedProperty(category = "padding") 2831 protected int mPaddingRight = 0; 2832 /** 2833 * The top padding in pixels, that is the distance in pixels between the 2834 * top edge of this view and the top edge of its content. 2835 * {@hide} 2836 */ 2837 @ViewDebug.ExportedProperty(category = "padding") 2838 protected int mPaddingTop; 2839 /** 2840 * The bottom padding in pixels, that is the distance in pixels between the 2841 * bottom edge of this view and the bottom edge of its content. 2842 * {@hide} 2843 */ 2844 @ViewDebug.ExportedProperty(category = "padding") 2845 protected int mPaddingBottom; 2846 2847 /** 2848 * The layout insets in pixels, that is the distance in pixels between the 2849 * visible edges of this view its bounds. 2850 */ 2851 private Insets mLayoutInsets; 2852 2853 /** 2854 * Briefly describes the view and is primarily used for accessibility support. 2855 */ 2856 private CharSequence mContentDescription; 2857 2858 /** 2859 * Specifies the id of a view for which this view serves as a label for 2860 * accessibility purposes. 2861 */ 2862 private int mLabelForId = View.NO_ID; 2863 2864 /** 2865 * Predicate for matching labeled view id with its label for 2866 * accessibility purposes. 2867 */ 2868 private MatchLabelForPredicate mMatchLabelForPredicate; 2869 2870 /** 2871 * Predicate for matching a view by its id. 2872 */ 2873 private MatchIdPredicate mMatchIdPredicate; 2874 2875 /** 2876 * Cache the paddingRight set by the user to append to the scrollbar's size. 2877 * 2878 * @hide 2879 */ 2880 @ViewDebug.ExportedProperty(category = "padding") 2881 protected int mUserPaddingRight; 2882 2883 /** 2884 * Cache the paddingBottom set by the user to append to the scrollbar's size. 2885 * 2886 * @hide 2887 */ 2888 @ViewDebug.ExportedProperty(category = "padding") 2889 protected int mUserPaddingBottom; 2890 2891 /** 2892 * Cache the paddingLeft set by the user to append to the scrollbar's size. 2893 * 2894 * @hide 2895 */ 2896 @ViewDebug.ExportedProperty(category = "padding") 2897 protected int mUserPaddingLeft; 2898 2899 /** 2900 * Cache the paddingStart set by the user to append to the scrollbar's size. 2901 * 2902 */ 2903 @ViewDebug.ExportedProperty(category = "padding") 2904 int mUserPaddingStart; 2905 2906 /** 2907 * Cache the paddingEnd set by the user to append to the scrollbar's size. 2908 * 2909 */ 2910 @ViewDebug.ExportedProperty(category = "padding") 2911 int mUserPaddingEnd; 2912 2913 /** 2914 * Cache initial left padding. 2915 * 2916 * @hide 2917 */ 2918 int mUserPaddingLeftInitial; 2919 2920 /** 2921 * Cache initial right padding. 2922 * 2923 * @hide 2924 */ 2925 int mUserPaddingRightInitial; 2926 2927 /** 2928 * Default undefined padding 2929 */ 2930 private static final int UNDEFINED_PADDING = Integer.MIN_VALUE; 2931 2932 /** 2933 * @hide 2934 */ 2935 int mOldWidthMeasureSpec = Integer.MIN_VALUE; 2936 /** 2937 * @hide 2938 */ 2939 int mOldHeightMeasureSpec = Integer.MIN_VALUE; 2940 2941 @ViewDebug.ExportedProperty(deepExport = true, prefix = "bg_") 2942 private Drawable mBackground; 2943 2944 private int mBackgroundResource; 2945 private boolean mBackgroundSizeChanged; 2946 2947 static class ListenerInfo { 2948 /** 2949 * Listener used to dispatch focus change events. 2950 * This field should be made private, so it is hidden from the SDK. 2951 * {@hide} 2952 */ 2953 protected OnFocusChangeListener mOnFocusChangeListener; 2954 2955 /** 2956 * Listeners for layout change events. 2957 */ 2958 private ArrayList<OnLayoutChangeListener> mOnLayoutChangeListeners; 2959 2960 /** 2961 * Listeners for attach events. 2962 */ 2963 private CopyOnWriteArrayList<OnAttachStateChangeListener> mOnAttachStateChangeListeners; 2964 2965 /** 2966 * Listener used to dispatch click events. 2967 * This field should be made private, so it is hidden from the SDK. 2968 * {@hide} 2969 */ 2970 public OnClickListener mOnClickListener; 2971 2972 /** 2973 * Listener used to dispatch long click events. 2974 * This field should be made private, so it is hidden from the SDK. 2975 * {@hide} 2976 */ 2977 protected OnLongClickListener mOnLongClickListener; 2978 2979 /** 2980 * Listener used to build the context menu. 2981 * This field should be made private, so it is hidden from the SDK. 2982 * {@hide} 2983 */ 2984 protected OnCreateContextMenuListener mOnCreateContextMenuListener; 2985 2986 private OnKeyListener mOnKeyListener; 2987 2988 private OnTouchListener mOnTouchListener; 2989 2990 private OnHoverListener mOnHoverListener; 2991 2992 private OnGenericMotionListener mOnGenericMotionListener; 2993 2994 private OnDragListener mOnDragListener; 2995 2996 private OnSystemUiVisibilityChangeListener mOnSystemUiVisibilityChangeListener; 2997 } 2998 2999 ListenerInfo mListenerInfo; 3000 3001 /** 3002 * The application environment this view lives in. 3003 * This field should be made private, so it is hidden from the SDK. 3004 * {@hide} 3005 */ 3006 protected Context mContext; 3007 3008 private final Resources mResources; 3009 3010 private ScrollabilityCache mScrollCache; 3011 3012 private int[] mDrawableState = null; 3013 3014 /** 3015 * Set to true when drawing cache is enabled and cannot be created. 3016 * 3017 * @hide 3018 */ 3019 public boolean mCachingFailed; 3020 3021 private Bitmap mDrawingCache; 3022 private Bitmap mUnscaledDrawingCache; 3023 private HardwareLayer mHardwareLayer; 3024 DisplayList mDisplayList; 3025 3026 /** 3027 * When this view has focus and the next focus is {@link #FOCUS_LEFT}, 3028 * the user may specify which view to go to next. 3029 */ 3030 private int mNextFocusLeftId = View.NO_ID; 3031 3032 /** 3033 * When this view has focus and the next focus is {@link #FOCUS_RIGHT}, 3034 * the user may specify which view to go to next. 3035 */ 3036 private int mNextFocusRightId = View.NO_ID; 3037 3038 /** 3039 * When this view has focus and the next focus is {@link #FOCUS_UP}, 3040 * the user may specify which view to go to next. 3041 */ 3042 private int mNextFocusUpId = View.NO_ID; 3043 3044 /** 3045 * When this view has focus and the next focus is {@link #FOCUS_DOWN}, 3046 * the user may specify which view to go to next. 3047 */ 3048 private int mNextFocusDownId = View.NO_ID; 3049 3050 /** 3051 * When this view has focus and the next focus is {@link #FOCUS_FORWARD}, 3052 * the user may specify which view to go to next. 3053 */ 3054 int mNextFocusForwardId = View.NO_ID; 3055 3056 private CheckForLongPress mPendingCheckForLongPress; 3057 private CheckForTap mPendingCheckForTap = null; 3058 private PerformClick mPerformClick; 3059 private SendViewScrolledAccessibilityEvent mSendViewScrolledAccessibilityEvent; 3060 3061 private UnsetPressedState mUnsetPressedState; 3062 3063 /** 3064 * Whether the long press's action has been invoked. The tap's action is invoked on the 3065 * up event while a long press is invoked as soon as the long press duration is reached, so 3066 * a long press could be performed before the tap is checked, in which case the tap's action 3067 * should not be invoked. 3068 */ 3069 private boolean mHasPerformedLongPress; 3070 3071 /** 3072 * The minimum height of the view. We'll try our best to have the height 3073 * of this view to at least this amount. 3074 */ 3075 @ViewDebug.ExportedProperty(category = "measurement") 3076 private int mMinHeight; 3077 3078 /** 3079 * The minimum width of the view. We'll try our best to have the width 3080 * of this view to at least this amount. 3081 */ 3082 @ViewDebug.ExportedProperty(category = "measurement") 3083 private int mMinWidth; 3084 3085 /** 3086 * The delegate to handle touch events that are physically in this view 3087 * but should be handled by another view. 3088 */ 3089 private TouchDelegate mTouchDelegate = null; 3090 3091 /** 3092 * Solid color to use as a background when creating the drawing cache. Enables 3093 * the cache to use 16 bit bitmaps instead of 32 bit. 3094 */ 3095 private int mDrawingCacheBackgroundColor = 0; 3096 3097 /** 3098 * Special tree observer used when mAttachInfo is null. 3099 */ 3100 private ViewTreeObserver mFloatingTreeObserver; 3101 3102 /** 3103 * Cache the touch slop from the context that created the view. 3104 */ 3105 private int mTouchSlop; 3106 3107 /** 3108 * Object that handles automatic animation of view properties. 3109 */ 3110 private ViewPropertyAnimator mAnimator = null; 3111 3112 /** 3113 * Flag indicating that a drag can cross window boundaries. When 3114 * {@link #startDrag(ClipData, DragShadowBuilder, Object, int)} is called 3115 * with this flag set, all visible applications will be able to participate 3116 * in the drag operation and receive the dragged content. 3117 * 3118 * @hide 3119 */ 3120 public static final int DRAG_FLAG_GLOBAL = 1; 3121 3122 /** 3123 * Vertical scroll factor cached by {@link #getVerticalScrollFactor}. 3124 */ 3125 private float mVerticalScrollFactor; 3126 3127 /** 3128 * Position of the vertical scroll bar. 3129 */ 3130 private int mVerticalScrollbarPosition; 3131 3132 /** 3133 * Position the scroll bar at the default position as determined by the system. 3134 */ 3135 public static final int SCROLLBAR_POSITION_DEFAULT = 0; 3136 3137 /** 3138 * Position the scroll bar along the left edge. 3139 */ 3140 public static final int SCROLLBAR_POSITION_LEFT = 1; 3141 3142 /** 3143 * Position the scroll bar along the right edge. 3144 */ 3145 public static final int SCROLLBAR_POSITION_RIGHT = 2; 3146 3147 /** 3148 * Indicates that the view does not have a layer. 3149 * 3150 * @see #getLayerType() 3151 * @see #setLayerType(int, android.graphics.Paint) 3152 * @see #LAYER_TYPE_SOFTWARE 3153 * @see #LAYER_TYPE_HARDWARE 3154 */ 3155 public static final int LAYER_TYPE_NONE = 0; 3156 3157 /** 3158 * <p>Indicates that the view has a software layer. A software layer is backed 3159 * by a bitmap and causes the view to be rendered using Android's software 3160 * rendering pipeline, even if hardware acceleration is enabled.</p> 3161 * 3162 * <p>Software layers have various usages:</p> 3163 * <p>When the application is not using hardware acceleration, a software layer 3164 * is useful to apply a specific color filter and/or blending mode and/or 3165 * translucency to a view and all its children.</p> 3166 * <p>When the application is using hardware acceleration, a software layer 3167 * is useful to render drawing primitives not supported by the hardware 3168 * accelerated pipeline. It can also be used to cache a complex view tree 3169 * into a texture and reduce the complexity of drawing operations. For instance, 3170 * when animating a complex view tree with a translation, a software layer can 3171 * be used to render the view tree only once.</p> 3172 * <p>Software layers should be avoided when the affected view tree updates 3173 * often. Every update will require to re-render the software layer, which can 3174 * potentially be slow (particularly when hardware acceleration is turned on 3175 * since the layer will have to be uploaded into a hardware texture after every 3176 * update.)</p> 3177 * 3178 * @see #getLayerType() 3179 * @see #setLayerType(int, android.graphics.Paint) 3180 * @see #LAYER_TYPE_NONE 3181 * @see #LAYER_TYPE_HARDWARE 3182 */ 3183 public static final int LAYER_TYPE_SOFTWARE = 1; 3184 3185 /** 3186 * <p>Indicates that the view has a hardware layer. A hardware layer is backed 3187 * by a hardware specific texture (generally Frame Buffer Objects or FBO on 3188 * OpenGL hardware) and causes the view to be rendered using Android's hardware 3189 * rendering pipeline, but only if hardware acceleration is turned on for the 3190 * view hierarchy. When hardware acceleration is turned off, hardware layers 3191 * behave exactly as {@link #LAYER_TYPE_SOFTWARE software layers}.</p> 3192 * 3193 * <p>A hardware layer is useful to apply a specific color filter and/or 3194 * blending mode and/or translucency to a view and all its children.</p> 3195 * <p>A hardware layer can be used to cache a complex view tree into a 3196 * texture and reduce the complexity of drawing operations. For instance, 3197 * when animating a complex view tree with a translation, a hardware layer can 3198 * be used to render the view tree only once.</p> 3199 * <p>A hardware layer can also be used to increase the rendering quality when 3200 * rotation transformations are applied on a view. It can also be used to 3201 * prevent potential clipping issues when applying 3D transforms on a view.</p> 3202 * 3203 * @see #getLayerType() 3204 * @see #setLayerType(int, android.graphics.Paint) 3205 * @see #LAYER_TYPE_NONE 3206 * @see #LAYER_TYPE_SOFTWARE 3207 */ 3208 public static final int LAYER_TYPE_HARDWARE = 2; 3209 3210 @ViewDebug.ExportedProperty(category = "drawing", mapping = { 3211 @ViewDebug.IntToString(from = LAYER_TYPE_NONE, to = "NONE"), 3212 @ViewDebug.IntToString(from = LAYER_TYPE_SOFTWARE, to = "SOFTWARE"), 3213 @ViewDebug.IntToString(from = LAYER_TYPE_HARDWARE, to = "HARDWARE") 3214 }) 3215 int mLayerType = LAYER_TYPE_NONE; 3216 Paint mLayerPaint; 3217 Rect mLocalDirtyRect; 3218 3219 /** 3220 * Set to true when the view is sending hover accessibility events because it 3221 * is the innermost hovered view. 3222 */ 3223 private boolean mSendingHoverAccessibilityEvents; 3224 3225 /** 3226 * Delegate for injecting accessibility functionality. 3227 */ 3228 AccessibilityDelegate mAccessibilityDelegate; 3229 3230 /** 3231 * The view's overlay layer. Developers get a reference to the overlay via getOverlay() 3232 * and add/remove objects to/from the overlay directly through the Overlay methods. 3233 */ 3234 ViewOverlay mOverlay; 3235 3236 /** 3237 * Consistency verifier for debugging purposes. 3238 * @hide 3239 */ 3240 protected final InputEventConsistencyVerifier mInputEventConsistencyVerifier = 3241 InputEventConsistencyVerifier.isInstrumentationEnabled() ? 3242 new InputEventConsistencyVerifier(this, 0) : null; 3243 3244 private static final AtomicInteger sNextGeneratedId = new AtomicInteger(1); 3245 3246 /** 3247 * Simple constructor to use when creating a view from code. 3248 * 3249 * @param context The Context the view is running in, through which it can 3250 * access the current theme, resources, etc. 3251 */ 3252 public View(Context context) { 3253 mContext = context; 3254 mResources = context != null ? context.getResources() : null; 3255 mViewFlags = SOUND_EFFECTS_ENABLED | HAPTIC_FEEDBACK_ENABLED; 3256 // Set some flags defaults 3257 mPrivateFlags2 = 3258 (LAYOUT_DIRECTION_DEFAULT << PFLAG2_LAYOUT_DIRECTION_MASK_SHIFT) | 3259 (TEXT_DIRECTION_DEFAULT << PFLAG2_TEXT_DIRECTION_MASK_SHIFT) | 3260 (PFLAG2_TEXT_DIRECTION_RESOLVED_DEFAULT) | 3261 (TEXT_ALIGNMENT_DEFAULT << PFLAG2_TEXT_ALIGNMENT_MASK_SHIFT) | 3262 (PFLAG2_TEXT_ALIGNMENT_RESOLVED_DEFAULT) | 3263 (IMPORTANT_FOR_ACCESSIBILITY_DEFAULT << PFLAG2_IMPORTANT_FOR_ACCESSIBILITY_SHIFT); 3264 mTouchSlop = ViewConfiguration.get(context).getScaledTouchSlop(); 3265 setOverScrollMode(OVER_SCROLL_IF_CONTENT_SCROLLS); 3266 mUserPaddingStart = UNDEFINED_PADDING; 3267 mUserPaddingEnd = UNDEFINED_PADDING; 3268 3269 if (!sUseBrokenMakeMeasureSpec && context.getApplicationInfo().targetSdkVersion <= 3270 Build.VERSION_CODES.JELLY_BEAN_MR1 ) { 3271 // Older apps may need this compatibility hack for measurement. 3272 sUseBrokenMakeMeasureSpec = true; 3273 } 3274 } 3275 3276 /** 3277 * Constructor that is called when inflating a view from XML. This is called 3278 * when a view is being constructed from an XML file, supplying attributes 3279 * that were specified in the XML file. This version uses a default style of 3280 * 0, so the only attribute values applied are those in the Context's Theme 3281 * and the given AttributeSet. 3282 * 3283 * <p> 3284 * The method onFinishInflate() will be called after all children have been 3285 * added. 3286 * 3287 * @param context The Context the view is running in, through which it can 3288 * access the current theme, resources, etc. 3289 * @param attrs The attributes of the XML tag that is inflating the view. 3290 * @see #View(Context, AttributeSet, int) 3291 */ 3292 public View(Context context, AttributeSet attrs) { 3293 this(context, attrs, 0); 3294 } 3295 3296 /** 3297 * Perform inflation from XML and apply a class-specific base style. This 3298 * constructor of View allows subclasses to use their own base style when 3299 * they are inflating. For example, a Button class's constructor would call 3300 * this version of the super class constructor and supply 3301 * <code>R.attr.buttonStyle</code> for <var>defStyle</var>; this allows 3302 * the theme's button style to modify all of the base view attributes (in 3303 * particular its background) as well as the Button class's attributes. 3304 * 3305 * @param context The Context the view is running in, through which it can 3306 * access the current theme, resources, etc. 3307 * @param attrs The attributes of the XML tag that is inflating the view. 3308 * @param defStyle The default style to apply to this view. If 0, no style 3309 * will be applied (beyond what is included in the theme). This may 3310 * either be an attribute resource, whose value will be retrieved 3311 * from the current theme, or an explicit style resource. 3312 * @see #View(Context, AttributeSet) 3313 */ 3314 public View(Context context, AttributeSet attrs, int defStyle) { 3315 this(context); 3316 3317 TypedArray a = context.obtainStyledAttributes(attrs, com.android.internal.R.styleable.View, 3318 defStyle, 0); 3319 3320 Drawable background = null; 3321 3322 int leftPadding = -1; 3323 int topPadding = -1; 3324 int rightPadding = -1; 3325 int bottomPadding = -1; 3326 int startPadding = UNDEFINED_PADDING; 3327 int endPadding = UNDEFINED_PADDING; 3328 3329 int padding = -1; 3330 3331 int viewFlagValues = 0; 3332 int viewFlagMasks = 0; 3333 3334 boolean setScrollContainer = false; 3335 3336 int x = 0; 3337 int y = 0; 3338 3339 float tx = 0; 3340 float ty = 0; 3341 float rotation = 0; 3342 float rotationX = 0; 3343 float rotationY = 0; 3344 float sx = 1f; 3345 float sy = 1f; 3346 boolean transformSet = false; 3347 3348 int scrollbarStyle = SCROLLBARS_INSIDE_OVERLAY; 3349 int overScrollMode = mOverScrollMode; 3350 boolean initializeScrollbars = false; 3351 3352 boolean leftPaddingDefined = false; 3353 boolean rightPaddingDefined = false; 3354 boolean startPaddingDefined = false; 3355 boolean endPaddingDefined = false; 3356 3357 final int targetSdkVersion = context.getApplicationInfo().targetSdkVersion; 3358 3359 final int N = a.getIndexCount(); 3360 for (int i = 0; i < N; i++) { 3361 int attr = a.getIndex(i); 3362 switch (attr) { 3363 case com.android.internal.R.styleable.View_background: 3364 background = a.getDrawable(attr); 3365 break; 3366 case com.android.internal.R.styleable.View_padding: 3367 padding = a.getDimensionPixelSize(attr, -1); 3368 mUserPaddingLeftInitial = padding; 3369 mUserPaddingRightInitial = padding; 3370 leftPaddingDefined = true; 3371 rightPaddingDefined = true; 3372 break; 3373 case com.android.internal.R.styleable.View_paddingLeft: 3374 leftPadding = a.getDimensionPixelSize(attr, -1); 3375 mUserPaddingLeftInitial = leftPadding; 3376 leftPaddingDefined = true; 3377 break; 3378 case com.android.internal.R.styleable.View_paddingTop: 3379 topPadding = a.getDimensionPixelSize(attr, -1); 3380 break; 3381 case com.android.internal.R.styleable.View_paddingRight: 3382 rightPadding = a.getDimensionPixelSize(attr, -1); 3383 mUserPaddingRightInitial = rightPadding; 3384 rightPaddingDefined = true; 3385 break; 3386 case com.android.internal.R.styleable.View_paddingBottom: 3387 bottomPadding = a.getDimensionPixelSize(attr, -1); 3388 break; 3389 case com.android.internal.R.styleable.View_paddingStart: 3390 startPadding = a.getDimensionPixelSize(attr, UNDEFINED_PADDING); 3391 startPaddingDefined = (startPadding != UNDEFINED_PADDING); 3392 break; 3393 case com.android.internal.R.styleable.View_paddingEnd: 3394 endPadding = a.getDimensionPixelSize(attr, UNDEFINED_PADDING); 3395 endPaddingDefined = (endPadding != UNDEFINED_PADDING); 3396 break; 3397 case com.android.internal.R.styleable.View_scrollX: 3398 x = a.getDimensionPixelOffset(attr, 0); 3399 break; 3400 case com.android.internal.R.styleable.View_scrollY: 3401 y = a.getDimensionPixelOffset(attr, 0); 3402 break; 3403 case com.android.internal.R.styleable.View_alpha: 3404 setAlpha(a.getFloat(attr, 1f)); 3405 break; 3406 case com.android.internal.R.styleable.View_transformPivotX: 3407 setPivotX(a.getDimensionPixelOffset(attr, 0)); 3408 break; 3409 case com.android.internal.R.styleable.View_transformPivotY: 3410 setPivotY(a.getDimensionPixelOffset(attr, 0)); 3411 break; 3412 case com.android.internal.R.styleable.View_translationX: 3413 tx = a.getDimensionPixelOffset(attr, 0); 3414 transformSet = true; 3415 break; 3416 case com.android.internal.R.styleable.View_translationY: 3417 ty = a.getDimensionPixelOffset(attr, 0); 3418 transformSet = true; 3419 break; 3420 case com.android.internal.R.styleable.View_rotation: 3421 rotation = a.getFloat(attr, 0); 3422 transformSet = true; 3423 break; 3424 case com.android.internal.R.styleable.View_rotationX: 3425 rotationX = a.getFloat(attr, 0); 3426 transformSet = true; 3427 break; 3428 case com.android.internal.R.styleable.View_rotationY: 3429 rotationY = a.getFloat(attr, 0); 3430 transformSet = true; 3431 break; 3432 case com.android.internal.R.styleable.View_scaleX: 3433 sx = a.getFloat(attr, 1f); 3434 transformSet = true; 3435 break; 3436 case com.android.internal.R.styleable.View_scaleY: 3437 sy = a.getFloat(attr, 1f); 3438 transformSet = true; 3439 break; 3440 case com.android.internal.R.styleable.View_id: 3441 mID = a.getResourceId(attr, NO_ID); 3442 break; 3443 case com.android.internal.R.styleable.View_tag: 3444 mTag = a.getText(attr); 3445 break; 3446 case com.android.internal.R.styleable.View_fitsSystemWindows: 3447 if (a.getBoolean(attr, false)) { 3448 viewFlagValues |= FITS_SYSTEM_WINDOWS; 3449 viewFlagMasks |= FITS_SYSTEM_WINDOWS; 3450 } 3451 break; 3452 case com.android.internal.R.styleable.View_focusable: 3453 if (a.getBoolean(attr, false)) { 3454 viewFlagValues |= FOCUSABLE; 3455 viewFlagMasks |= FOCUSABLE_MASK; 3456 } 3457 break; 3458 case com.android.internal.R.styleable.View_focusableInTouchMode: 3459 if (a.getBoolean(attr, false)) { 3460 viewFlagValues |= FOCUSABLE_IN_TOUCH_MODE | FOCUSABLE; 3461 viewFlagMasks |= FOCUSABLE_IN_TOUCH_MODE | FOCUSABLE_MASK; 3462 } 3463 break; 3464 case com.android.internal.R.styleable.View_clickable: 3465 if (a.getBoolean(attr, false)) { 3466 viewFlagValues |= CLICKABLE; 3467 viewFlagMasks |= CLICKABLE; 3468 } 3469 break; 3470 case com.android.internal.R.styleable.View_longClickable: 3471 if (a.getBoolean(attr, false)) { 3472 viewFlagValues |= LONG_CLICKABLE; 3473 viewFlagMasks |= LONG_CLICKABLE; 3474 } 3475 break; 3476 case com.android.internal.R.styleable.View_saveEnabled: 3477 if (!a.getBoolean(attr, true)) { 3478 viewFlagValues |= SAVE_DISABLED; 3479 viewFlagMasks |= SAVE_DISABLED_MASK; 3480 } 3481 break; 3482 case com.android.internal.R.styleable.View_duplicateParentState: 3483 if (a.getBoolean(attr, false)) { 3484 viewFlagValues |= DUPLICATE_PARENT_STATE; 3485 viewFlagMasks |= DUPLICATE_PARENT_STATE; 3486 } 3487 break; 3488 case com.android.internal.R.styleable.View_visibility: 3489 final int visibility = a.getInt(attr, 0); 3490 if (visibility != 0) { 3491 viewFlagValues |= VISIBILITY_FLAGS[visibility]; 3492 viewFlagMasks |= VISIBILITY_MASK; 3493 } 3494 break; 3495 case com.android.internal.R.styleable.View_layoutDirection: 3496 // Clear any layout direction flags (included resolved bits) already set 3497 mPrivateFlags2 &= 3498 ~(PFLAG2_LAYOUT_DIRECTION_MASK | PFLAG2_LAYOUT_DIRECTION_RESOLVED_MASK); 3499 // Set the layout direction flags depending on the value of the attribute 3500 final int layoutDirection = a.getInt(attr, -1); 3501 final int value = (layoutDirection != -1) ? 3502 LAYOUT_DIRECTION_FLAGS[layoutDirection] : LAYOUT_DIRECTION_DEFAULT; 3503 mPrivateFlags2 |= (value << PFLAG2_LAYOUT_DIRECTION_MASK_SHIFT); 3504 break; 3505 case com.android.internal.R.styleable.View_drawingCacheQuality: 3506 final int cacheQuality = a.getInt(attr, 0); 3507 if (cacheQuality != 0) { 3508 viewFlagValues |= DRAWING_CACHE_QUALITY_FLAGS[cacheQuality]; 3509 viewFlagMasks |= DRAWING_CACHE_QUALITY_MASK; 3510 } 3511 break; 3512 case com.android.internal.R.styleable.View_contentDescription: 3513 setContentDescription(a.getString(attr)); 3514 break; 3515 case com.android.internal.R.styleable.View_labelFor: 3516 setLabelFor(a.getResourceId(attr, NO_ID)); 3517 break; 3518 case com.android.internal.R.styleable.View_soundEffectsEnabled: 3519 if (!a.getBoolean(attr, true)) { 3520 viewFlagValues &= ~SOUND_EFFECTS_ENABLED; 3521 viewFlagMasks |= SOUND_EFFECTS_ENABLED; 3522 } 3523 break; 3524 case com.android.internal.R.styleable.View_hapticFeedbackEnabled: 3525 if (!a.getBoolean(attr, true)) { 3526 viewFlagValues &= ~HAPTIC_FEEDBACK_ENABLED; 3527 viewFlagMasks |= HAPTIC_FEEDBACK_ENABLED; 3528 } 3529 break; 3530 case R.styleable.View_scrollbars: 3531 final int scrollbars = a.getInt(attr, SCROLLBARS_NONE); 3532 if (scrollbars != SCROLLBARS_NONE) { 3533 viewFlagValues |= scrollbars; 3534 viewFlagMasks |= SCROLLBARS_MASK; 3535 initializeScrollbars = true; 3536 } 3537 break; 3538 //noinspection deprecation 3539 case R.styleable.View_fadingEdge: 3540 if (targetSdkVersion >= ICE_CREAM_SANDWICH) { 3541 // Ignore the attribute starting with ICS 3542 break; 3543 } 3544 // With builds < ICS, fall through and apply fading edges 3545 case R.styleable.View_requiresFadingEdge: 3546 final int fadingEdge = a.getInt(attr, FADING_EDGE_NONE); 3547 if (fadingEdge != FADING_EDGE_NONE) { 3548 viewFlagValues |= fadingEdge; 3549 viewFlagMasks |= FADING_EDGE_MASK; 3550 initializeFadingEdge(a); 3551 } 3552 break; 3553 case R.styleable.View_scrollbarStyle: 3554 scrollbarStyle = a.getInt(attr, SCROLLBARS_INSIDE_OVERLAY); 3555 if (scrollbarStyle != SCROLLBARS_INSIDE_OVERLAY) { 3556 viewFlagValues |= scrollbarStyle & SCROLLBARS_STYLE_MASK; 3557 viewFlagMasks |= SCROLLBARS_STYLE_MASK; 3558 } 3559 break; 3560 case R.styleable.View_isScrollContainer: 3561 setScrollContainer = true; 3562 if (a.getBoolean(attr, false)) { 3563 setScrollContainer(true); 3564 } 3565 break; 3566 case com.android.internal.R.styleable.View_keepScreenOn: 3567 if (a.getBoolean(attr, false)) { 3568 viewFlagValues |= KEEP_SCREEN_ON; 3569 viewFlagMasks |= KEEP_SCREEN_ON; 3570 } 3571 break; 3572 case R.styleable.View_filterTouchesWhenObscured: 3573 if (a.getBoolean(attr, false)) { 3574 viewFlagValues |= FILTER_TOUCHES_WHEN_OBSCURED; 3575 viewFlagMasks |= FILTER_TOUCHES_WHEN_OBSCURED; 3576 } 3577 break; 3578 case R.styleable.View_nextFocusLeft: 3579 mNextFocusLeftId = a.getResourceId(attr, View.NO_ID); 3580 break; 3581 case R.styleable.View_nextFocusRight: 3582 mNextFocusRightId = a.getResourceId(attr, View.NO_ID); 3583 break; 3584 case R.styleable.View_nextFocusUp: 3585 mNextFocusUpId = a.getResourceId(attr, View.NO_ID); 3586 break; 3587 case R.styleable.View_nextFocusDown: 3588 mNextFocusDownId = a.getResourceId(attr, View.NO_ID); 3589 break; 3590 case R.styleable.View_nextFocusForward: 3591 mNextFocusForwardId = a.getResourceId(attr, View.NO_ID); 3592 break; 3593 case R.styleable.View_minWidth: 3594 mMinWidth = a.getDimensionPixelSize(attr, 0); 3595 break; 3596 case R.styleable.View_minHeight: 3597 mMinHeight = a.getDimensionPixelSize(attr, 0); 3598 break; 3599 case R.styleable.View_onClick: 3600 if (context.isRestricted()) { 3601 throw new IllegalStateException("The android:onClick attribute cannot " 3602 + "be used within a restricted context"); 3603 } 3604 3605 final String handlerName = a.getString(attr); 3606 if (handlerName != null) { 3607 setOnClickListener(new OnClickListener() { 3608 private Method mHandler; 3609 3610 public void onClick(View v) { 3611 if (mHandler == null) { 3612 try { 3613 mHandler = getContext().getClass().getMethod(handlerName, 3614 View.class); 3615 } catch (NoSuchMethodException e) { 3616 int id = getId(); 3617 String idText = id == NO_ID ? "" : " with id '" 3618 + getContext().getResources().getResourceEntryName( 3619 id) + "'"; 3620 throw new IllegalStateException("Could not find a method " + 3621 handlerName + "(View) in the activity " 3622 + getContext().getClass() + " for onClick handler" 3623 + " on view " + View.this.getClass() + idText, e); 3624 } 3625 } 3626 3627 try { 3628 mHandler.invoke(getContext(), View.this); 3629 } catch (IllegalAccessException e) { 3630 throw new IllegalStateException("Could not execute non " 3631 + "public method of the activity", e); 3632 } catch (InvocationTargetException e) { 3633 throw new IllegalStateException("Could not execute " 3634 + "method of the activity", e); 3635 } 3636 } 3637 }); 3638 } 3639 break; 3640 case R.styleable.View_overScrollMode: 3641 overScrollMode = a.getInt(attr, OVER_SCROLL_IF_CONTENT_SCROLLS); 3642 break; 3643 case R.styleable.View_verticalScrollbarPosition: 3644 mVerticalScrollbarPosition = a.getInt(attr, SCROLLBAR_POSITION_DEFAULT); 3645 break; 3646 case R.styleable.View_layerType: 3647 setLayerType(a.getInt(attr, LAYER_TYPE_NONE), null); 3648 break; 3649 case R.styleable.View_textDirection: 3650 // Clear any text direction flag already set 3651 mPrivateFlags2 &= ~PFLAG2_TEXT_DIRECTION_MASK; 3652 // Set the text direction flags depending on the value of the attribute 3653 final int textDirection = a.getInt(attr, -1); 3654 if (textDirection != -1) { 3655 mPrivateFlags2 |= PFLAG2_TEXT_DIRECTION_FLAGS[textDirection]; 3656 } 3657 break; 3658 case R.styleable.View_textAlignment: 3659 // Clear any text alignment flag already set 3660 mPrivateFlags2 &= ~PFLAG2_TEXT_ALIGNMENT_MASK; 3661 // Set the text alignment flag depending on the value of the attribute 3662 final int textAlignment = a.getInt(attr, TEXT_ALIGNMENT_DEFAULT); 3663 mPrivateFlags2 |= PFLAG2_TEXT_ALIGNMENT_FLAGS[textAlignment]; 3664 break; 3665 case R.styleable.View_importantForAccessibility: 3666 setImportantForAccessibility(a.getInt(attr, 3667 IMPORTANT_FOR_ACCESSIBILITY_DEFAULT)); 3668 break; 3669 } 3670 } 3671 3672 setOverScrollMode(overScrollMode); 3673 3674 // Cache start/end user padding as we cannot fully resolve padding here (we dont have yet 3675 // the resolved layout direction). Those cached values will be used later during padding 3676 // resolution. 3677 mUserPaddingStart = startPadding; 3678 mUserPaddingEnd = endPadding; 3679 3680 if (background != null) { 3681 setBackground(background); 3682 } 3683 3684 if (padding >= 0) { 3685 leftPadding = padding; 3686 topPadding = padding; 3687 rightPadding = padding; 3688 bottomPadding = padding; 3689 mUserPaddingLeftInitial = padding; 3690 mUserPaddingRightInitial = padding; 3691 } 3692 3693 if (isRtlCompatibilityMode()) { 3694 // RTL compatibility mode: pre Jelly Bean MR1 case OR no RTL support case. 3695 // left / right padding are used if defined (meaning here nothing to do). If they are not 3696 // defined and start / end padding are defined (e.g. in Frameworks resources), then we use 3697 // start / end and resolve them as left / right (layout direction is not taken into account). 3698 // Padding from the background drawable is stored at this point in mUserPaddingLeftInitial 3699 // and mUserPaddingRightInitial) so drawable padding will be used as ultimate default if 3700 // defined. 3701 if (!leftPaddingDefined && startPaddingDefined) { 3702 leftPadding = startPadding; 3703 } 3704 mUserPaddingLeftInitial = (leftPadding >= 0) ? leftPadding : mUserPaddingLeftInitial; 3705 if (!rightPaddingDefined && endPaddingDefined) { 3706 rightPadding = endPadding; 3707 } 3708 mUserPaddingRightInitial = (rightPadding >= 0) ? rightPadding : mUserPaddingRightInitial; 3709 } else { 3710 // Jelly Bean MR1 and after case: if start/end defined, they will override any left/right 3711 // values defined. Otherwise, left /right values are used. 3712 // Padding from the background drawable is stored at this point in mUserPaddingLeftInitial 3713 // and mUserPaddingRightInitial) so drawable padding will be used as ultimate default if 3714 // defined. 3715 final boolean hasRelativePadding = startPaddingDefined || endPaddingDefined; 3716 3717 if (leftPaddingDefined && !hasRelativePadding) { 3718 mUserPaddingLeftInitial = leftPadding; 3719 } 3720 if (rightPaddingDefined && !hasRelativePadding) { 3721 mUserPaddingRightInitial = rightPadding; 3722 } 3723 } 3724 3725 internalSetPadding( 3726 mUserPaddingLeftInitial, 3727 topPadding >= 0 ? topPadding : mPaddingTop, 3728 mUserPaddingRightInitial, 3729 bottomPadding >= 0 ? bottomPadding : mPaddingBottom); 3730 3731 if (viewFlagMasks != 0) { 3732 setFlags(viewFlagValues, viewFlagMasks); 3733 } 3734 3735 if (initializeScrollbars) { 3736 initializeScrollbars(a); 3737 } 3738 3739 a.recycle(); 3740 3741 // Needs to be called after mViewFlags is set 3742 if (scrollbarStyle != SCROLLBARS_INSIDE_OVERLAY) { 3743 recomputePadding(); 3744 } 3745 3746 if (x != 0 || y != 0) { 3747 scrollTo(x, y); 3748 } 3749 3750 if (transformSet) { 3751 setTranslationX(tx); 3752 setTranslationY(ty); 3753 setRotation(rotation); 3754 setRotationX(rotationX); 3755 setRotationY(rotationY); 3756 setScaleX(sx); 3757 setScaleY(sy); 3758 } 3759 3760 if (!setScrollContainer && (viewFlagValues&SCROLLBARS_VERTICAL) != 0) { 3761 setScrollContainer(true); 3762 } 3763 3764 computeOpaqueFlags(); 3765 } 3766 3767 /** 3768 * Non-public constructor for use in testing 3769 */ 3770 View() { 3771 mResources = null; 3772 } 3773 3774 public String toString() { 3775 StringBuilder out = new StringBuilder(128); 3776 out.append(getClass().getName()); 3777 out.append('{'); 3778 out.append(Integer.toHexString(System.identityHashCode(this))); 3779 out.append(' '); 3780 switch (mViewFlags&VISIBILITY_MASK) { 3781 case VISIBLE: out.append('V'); break; 3782 case INVISIBLE: out.append('I'); break; 3783 case GONE: out.append('G'); break; 3784 default: out.append('.'); break; 3785 } 3786 out.append((mViewFlags&FOCUSABLE_MASK) == FOCUSABLE ? 'F' : '.'); 3787 out.append((mViewFlags&ENABLED_MASK) == ENABLED ? 'E' : '.'); 3788 out.append((mViewFlags&DRAW_MASK) == WILL_NOT_DRAW ? '.' : 'D'); 3789 out.append((mViewFlags&SCROLLBARS_HORIZONTAL) != 0 ? 'H' : '.'); 3790 out.append((mViewFlags&SCROLLBARS_VERTICAL) != 0 ? 'V' : '.'); 3791 out.append((mViewFlags&CLICKABLE) != 0 ? 'C' : '.'); 3792 out.append((mViewFlags&LONG_CLICKABLE) != 0 ? 'L' : '.'); 3793 out.append(' '); 3794 out.append((mPrivateFlags&PFLAG_IS_ROOT_NAMESPACE) != 0 ? 'R' : '.'); 3795 out.append((mPrivateFlags&PFLAG_FOCUSED) != 0 ? 'F' : '.'); 3796 out.append((mPrivateFlags&PFLAG_SELECTED) != 0 ? 'S' : '.'); 3797 if ((mPrivateFlags&PFLAG_PREPRESSED) != 0) { 3798 out.append('p'); 3799 } else { 3800 out.append((mPrivateFlags&PFLAG_PRESSED) != 0 ? 'P' : '.'); 3801 } 3802 out.append((mPrivateFlags&PFLAG_HOVERED) != 0 ? 'H' : '.'); 3803 out.append((mPrivateFlags&PFLAG_ACTIVATED) != 0 ? 'A' : '.'); 3804 out.append((mPrivateFlags&PFLAG_INVALIDATED) != 0 ? 'I' : '.'); 3805 out.append((mPrivateFlags&PFLAG_DIRTY_MASK) != 0 ? 'D' : '.'); 3806 out.append(' '); 3807 out.append(mLeft); 3808 out.append(','); 3809 out.append(mTop); 3810 out.append('-'); 3811 out.append(mRight); 3812 out.append(','); 3813 out.append(mBottom); 3814 final int id = getId(); 3815 if (id != NO_ID) { 3816 out.append(" #"); 3817 out.append(Integer.toHexString(id)); 3818 final Resources r = mResources; 3819 if (id != 0 && r != null) { 3820 try { 3821 String pkgname; 3822 switch (id&0xff000000) { 3823 case 0x7f000000: 3824 pkgname="app"; 3825 break; 3826 case 0x01000000: 3827 pkgname="android"; 3828 break; 3829 default: 3830 pkgname = r.getResourcePackageName(id); 3831 break; 3832 } 3833 String typename = r.getResourceTypeName(id); 3834 String entryname = r.getResourceEntryName(id); 3835 out.append(" "); 3836 out.append(pkgname); 3837 out.append(":"); 3838 out.append(typename); 3839 out.append("/"); 3840 out.append(entryname); 3841 } catch (Resources.NotFoundException e) { 3842 } 3843 } 3844 } 3845 out.append("}"); 3846 return out.toString(); 3847 } 3848 3849 /** 3850 * <p> 3851 * Initializes the fading edges from a given set of styled attributes. This 3852 * method should be called by subclasses that need fading edges and when an 3853 * instance of these subclasses is created programmatically rather than 3854 * being inflated from XML. This method is automatically called when the XML 3855 * is inflated. 3856 * </p> 3857 * 3858 * @param a the styled attributes set to initialize the fading edges from 3859 */ 3860 protected void initializeFadingEdge(TypedArray a) { 3861 initScrollCache(); 3862 3863 mScrollCache.fadingEdgeLength = a.getDimensionPixelSize( 3864 R.styleable.View_fadingEdgeLength, 3865 ViewConfiguration.get(mContext).getScaledFadingEdgeLength()); 3866 } 3867 3868 /** 3869 * Returns the size of the vertical faded edges used to indicate that more 3870 * content in this view is visible. 3871 * 3872 * @return The size in pixels of the vertical faded edge or 0 if vertical 3873 * faded edges are not enabled for this view. 3874 * @attr ref android.R.styleable#View_fadingEdgeLength 3875 */ 3876 public int getVerticalFadingEdgeLength() { 3877 if (isVerticalFadingEdgeEnabled()) { 3878 ScrollabilityCache cache = mScrollCache; 3879 if (cache != null) { 3880 return cache.fadingEdgeLength; 3881 } 3882 } 3883 return 0; 3884 } 3885 3886 /** 3887 * Set the size of the faded edge used to indicate that more content in this 3888 * view is available. Will not change whether the fading edge is enabled; use 3889 * {@link #setVerticalFadingEdgeEnabled(boolean)} or 3890 * {@link #setHorizontalFadingEdgeEnabled(boolean)} to enable the fading edge 3891 * for the vertical or horizontal fading edges. 3892 * 3893 * @param length The size in pixels of the faded edge used to indicate that more 3894 * content in this view is visible. 3895 */ 3896 public void setFadingEdgeLength(int length) { 3897 initScrollCache(); 3898 mScrollCache.fadingEdgeLength = length; 3899 } 3900 3901 /** 3902 * Returns the size of the horizontal faded edges used to indicate that more 3903 * content in this view is visible. 3904 * 3905 * @return The size in pixels of the horizontal faded edge or 0 if horizontal 3906 * faded edges are not enabled for this view. 3907 * @attr ref android.R.styleable#View_fadingEdgeLength 3908 */ 3909 public int getHorizontalFadingEdgeLength() { 3910 if (isHorizontalFadingEdgeEnabled()) { 3911 ScrollabilityCache cache = mScrollCache; 3912 if (cache != null) { 3913 return cache.fadingEdgeLength; 3914 } 3915 } 3916 return 0; 3917 } 3918 3919 /** 3920 * Returns the width of the vertical scrollbar. 3921 * 3922 * @return The width in pixels of the vertical scrollbar or 0 if there 3923 * is no vertical scrollbar. 3924 */ 3925 public int getVerticalScrollbarWidth() { 3926 ScrollabilityCache cache = mScrollCache; 3927 if (cache != null) { 3928 ScrollBarDrawable scrollBar = cache.scrollBar; 3929 if (scrollBar != null) { 3930 int size = scrollBar.getSize(true); 3931 if (size <= 0) { 3932 size = cache.scrollBarSize; 3933 } 3934 return size; 3935 } 3936 return 0; 3937 } 3938 return 0; 3939 } 3940 3941 /** 3942 * Returns the height of the horizontal scrollbar. 3943 * 3944 * @return The height in pixels of the horizontal scrollbar or 0 if 3945 * there is no horizontal scrollbar. 3946 */ 3947 protected int getHorizontalScrollbarHeight() { 3948 ScrollabilityCache cache = mScrollCache; 3949 if (cache != null) { 3950 ScrollBarDrawable scrollBar = cache.scrollBar; 3951 if (scrollBar != null) { 3952 int size = scrollBar.getSize(false); 3953 if (size <= 0) { 3954 size = cache.scrollBarSize; 3955 } 3956 return size; 3957 } 3958 return 0; 3959 } 3960 return 0; 3961 } 3962 3963 /** 3964 * <p> 3965 * Initializes the scrollbars from a given set of styled attributes. This 3966 * method should be called by subclasses that need scrollbars and when an 3967 * instance of these subclasses is created programmatically rather than 3968 * being inflated from XML. This method is automatically called when the XML 3969 * is inflated. 3970 * </p> 3971 * 3972 * @param a the styled attributes set to initialize the scrollbars from 3973 */ 3974 protected void initializeScrollbars(TypedArray a) { 3975 initScrollCache(); 3976 3977 final ScrollabilityCache scrollabilityCache = mScrollCache; 3978 3979 if (scrollabilityCache.scrollBar == null) { 3980 scrollabilityCache.scrollBar = new ScrollBarDrawable(); 3981 } 3982 3983 final boolean fadeScrollbars = a.getBoolean(R.styleable.View_fadeScrollbars, true); 3984 3985 if (!fadeScrollbars) { 3986 scrollabilityCache.state = ScrollabilityCache.ON; 3987 } 3988 scrollabilityCache.fadeScrollBars = fadeScrollbars; 3989 3990 3991 scrollabilityCache.scrollBarFadeDuration = a.getInt( 3992 R.styleable.View_scrollbarFadeDuration, ViewConfiguration 3993 .getScrollBarFadeDuration()); 3994 scrollabilityCache.scrollBarDefaultDelayBeforeFade = a.getInt( 3995 R.styleable.View_scrollbarDefaultDelayBeforeFade, 3996 ViewConfiguration.getScrollDefaultDelay()); 3997 3998 3999 scrollabilityCache.scrollBarSize = a.getDimensionPixelSize( 4000 com.android.internal.R.styleable.View_scrollbarSize, 4001 ViewConfiguration.get(mContext).getScaledScrollBarSize()); 4002 4003 Drawable track = a.getDrawable(R.styleable.View_scrollbarTrackHorizontal); 4004 scrollabilityCache.scrollBar.setHorizontalTrackDrawable(track); 4005 4006 Drawable thumb = a.getDrawable(R.styleable.View_scrollbarThumbHorizontal); 4007 if (thumb != null) { 4008 scrollabilityCache.scrollBar.setHorizontalThumbDrawable(thumb); 4009 } 4010 4011 boolean alwaysDraw = a.getBoolean(R.styleable.View_scrollbarAlwaysDrawHorizontalTrack, 4012 false); 4013 if (alwaysDraw) { 4014 scrollabilityCache.scrollBar.setAlwaysDrawHorizontalTrack(true); 4015 } 4016 4017 track = a.getDrawable(R.styleable.View_scrollbarTrackVertical); 4018 scrollabilityCache.scrollBar.setVerticalTrackDrawable(track); 4019 4020 thumb = a.getDrawable(R.styleable.View_scrollbarThumbVertical); 4021 if (thumb != null) { 4022 scrollabilityCache.scrollBar.setVerticalThumbDrawable(thumb); 4023 } 4024 4025 alwaysDraw = a.getBoolean(R.styleable.View_scrollbarAlwaysDrawVerticalTrack, 4026 false); 4027 if (alwaysDraw) { 4028 scrollabilityCache.scrollBar.setAlwaysDrawVerticalTrack(true); 4029 } 4030 4031 // Apply layout direction to the new Drawables if needed 4032 final int layoutDirection = getLayoutDirection(); 4033 if (track != null) { 4034 track.setLayoutDirection(layoutDirection); 4035 } 4036 if (thumb != null) { 4037 thumb.setLayoutDirection(layoutDirection); 4038 } 4039 4040 // Re-apply user/background padding so that scrollbar(s) get added 4041 resolvePadding(); 4042 } 4043 4044 /** 4045 * <p> 4046 * Initalizes the scrollability cache if necessary. 4047 * </p> 4048 */ 4049 private void initScrollCache() { 4050 if (mScrollCache == null) { 4051 mScrollCache = new ScrollabilityCache(ViewConfiguration.get(mContext), this); 4052 } 4053 } 4054 4055 private ScrollabilityCache getScrollCache() { 4056 initScrollCache(); 4057 return mScrollCache; 4058 } 4059 4060 /** 4061 * Set the position of the vertical scroll bar. Should be one of 4062 * {@link #SCROLLBAR_POSITION_DEFAULT}, {@link #SCROLLBAR_POSITION_LEFT} or 4063 * {@link #SCROLLBAR_POSITION_RIGHT}. 4064 * 4065 * @param position Where the vertical scroll bar should be positioned. 4066 */ 4067 public void setVerticalScrollbarPosition(int position) { 4068 if (mVerticalScrollbarPosition != position) { 4069 mVerticalScrollbarPosition = position; 4070 computeOpaqueFlags(); 4071 resolvePadding(); 4072 } 4073 } 4074 4075 /** 4076 * @return The position where the vertical scroll bar will show, if applicable. 4077 * @see #setVerticalScrollbarPosition(int) 4078 */ 4079 public int getVerticalScrollbarPosition() { 4080 return mVerticalScrollbarPosition; 4081 } 4082 4083 ListenerInfo getListenerInfo() { 4084 if (mListenerInfo != null) { 4085 return mListenerInfo; 4086 } 4087 mListenerInfo = new ListenerInfo(); 4088 return mListenerInfo; 4089 } 4090 4091 /** 4092 * Register a callback to be invoked when focus of this view changed. 4093 * 4094 * @param l The callback that will run. 4095 */ 4096 public void setOnFocusChangeListener(OnFocusChangeListener l) { 4097 getListenerInfo().mOnFocusChangeListener = l; 4098 } 4099 4100 /** 4101 * Add a listener that will be called when the bounds of the view change due to 4102 * layout processing. 4103 * 4104 * @param listener The listener that will be called when layout bounds change. 4105 */ 4106 public void addOnLayoutChangeListener(OnLayoutChangeListener listener) { 4107 ListenerInfo li = getListenerInfo(); 4108 if (li.mOnLayoutChangeListeners == null) { 4109 li.mOnLayoutChangeListeners = new ArrayList<OnLayoutChangeListener>(); 4110 } 4111 if (!li.mOnLayoutChangeListeners.contains(listener)) { 4112 li.mOnLayoutChangeListeners.add(listener); 4113 } 4114 } 4115 4116 /** 4117 * Remove a listener for layout changes. 4118 * 4119 * @param listener The listener for layout bounds change. 4120 */ 4121 public void removeOnLayoutChangeListener(OnLayoutChangeListener listener) { 4122 ListenerInfo li = mListenerInfo; 4123 if (li == null || li.mOnLayoutChangeListeners == null) { 4124 return; 4125 } 4126 li.mOnLayoutChangeListeners.remove(listener); 4127 } 4128 4129 /** 4130 * Add a listener for attach state changes. 4131 * 4132 * This listener will be called whenever this view is attached or detached 4133 * from a window. Remove the listener using 4134 * {@link #removeOnAttachStateChangeListener(OnAttachStateChangeListener)}. 4135 * 4136 * @param listener Listener to attach 4137 * @see #removeOnAttachStateChangeListener(OnAttachStateChangeListener) 4138 */ 4139 public void addOnAttachStateChangeListener(OnAttachStateChangeListener listener) { 4140 ListenerInfo li = getListenerInfo(); 4141 if (li.mOnAttachStateChangeListeners == null) { 4142 li.mOnAttachStateChangeListeners 4143 = new CopyOnWriteArrayList<OnAttachStateChangeListener>(); 4144 } 4145 li.mOnAttachStateChangeListeners.add(listener); 4146 } 4147 4148 /** 4149 * Remove a listener for attach state changes. The listener will receive no further 4150 * notification of window attach/detach events. 4151 * 4152 * @param listener Listener to remove 4153 * @see #addOnAttachStateChangeListener(OnAttachStateChangeListener) 4154 */ 4155 public void removeOnAttachStateChangeListener(OnAttachStateChangeListener listener) { 4156 ListenerInfo li = mListenerInfo; 4157 if (li == null || li.mOnAttachStateChangeListeners == null) { 4158 return; 4159 } 4160 li.mOnAttachStateChangeListeners.remove(listener); 4161 } 4162 4163 /** 4164 * Returns the focus-change callback registered for this view. 4165 * 4166 * @return The callback, or null if one is not registered. 4167 */ 4168 public OnFocusChangeListener getOnFocusChangeListener() { 4169 ListenerInfo li = mListenerInfo; 4170 return li != null ? li.mOnFocusChangeListener : null; 4171 } 4172 4173 /** 4174 * Register a callback to be invoked when this view is clicked. If this view is not 4175 * clickable, it becomes clickable. 4176 * 4177 * @param l The callback that will run 4178 * 4179 * @see #setClickable(boolean) 4180 */ 4181 public void setOnClickListener(OnClickListener l) { 4182 if (!isClickable()) { 4183 setClickable(true); 4184 } 4185 getListenerInfo().mOnClickListener = l; 4186 } 4187 4188 /** 4189 * Return whether this view has an attached OnClickListener. Returns 4190 * true if there is a listener, false if there is none. 4191 */ 4192 public boolean hasOnClickListeners() { 4193 ListenerInfo li = mListenerInfo; 4194 return (li != null && li.mOnClickListener != null); 4195 } 4196 4197 /** 4198 * Register a callback to be invoked when this view is clicked and held. If this view is not 4199 * long clickable, it becomes long clickable. 4200 * 4201 * @param l The callback that will run 4202 * 4203 * @see #setLongClickable(boolean) 4204 */ 4205 public void setOnLongClickListener(OnLongClickListener l) { 4206 if (!isLongClickable()) { 4207 setLongClickable(true); 4208 } 4209 getListenerInfo().mOnLongClickListener = l; 4210 } 4211 4212 /** 4213 * Register a callback to be invoked when the context menu for this view is 4214 * being built. If this view is not long clickable, it becomes long clickable. 4215 * 4216 * @param l The callback that will run 4217 * 4218 */ 4219 public void setOnCreateContextMenuListener(OnCreateContextMenuListener l) { 4220 if (!isLongClickable()) { 4221 setLongClickable(true); 4222 } 4223 getListenerInfo().mOnCreateContextMenuListener = l; 4224 } 4225 4226 /** 4227 * Call this view's OnClickListener, if it is defined. Performs all normal 4228 * actions associated with clicking: reporting accessibility event, playing 4229 * a sound, etc. 4230 * 4231 * @return True there was an assigned OnClickListener that was called, false 4232 * otherwise is returned. 4233 */ 4234 public boolean performClick() { 4235 sendAccessibilityEvent(AccessibilityEvent.TYPE_VIEW_CLICKED); 4236 4237 ListenerInfo li = mListenerInfo; 4238 if (li != null && li.mOnClickListener != null) { 4239 playSoundEffect(SoundEffectConstants.CLICK); 4240 li.mOnClickListener.onClick(this); 4241 return true; 4242 } 4243 4244 return false; 4245 } 4246 4247 /** 4248 * Directly call any attached OnClickListener. Unlike {@link #performClick()}, 4249 * this only calls the listener, and does not do any associated clicking 4250 * actions like reporting an accessibility event. 4251 * 4252 * @return True there was an assigned OnClickListener that was called, false 4253 * otherwise is returned. 4254 */ 4255 public boolean callOnClick() { 4256 ListenerInfo li = mListenerInfo; 4257 if (li != null && li.mOnClickListener != null) { 4258 li.mOnClickListener.onClick(this); 4259 return true; 4260 } 4261 return false; 4262 } 4263 4264 /** 4265 * Call this view's OnLongClickListener, if it is defined. Invokes the context menu if the 4266 * OnLongClickListener did not consume the event. 4267 * 4268 * @return True if one of the above receivers consumed the event, false otherwise. 4269 */ 4270 public boolean performLongClick() { 4271 sendAccessibilityEvent(AccessibilityEvent.TYPE_VIEW_LONG_CLICKED); 4272 4273 boolean handled = false; 4274 ListenerInfo li = mListenerInfo; 4275 if (li != null && li.mOnLongClickListener != null) { 4276 handled = li.mOnLongClickListener.onLongClick(View.this); 4277 } 4278 if (!handled) { 4279 handled = showContextMenu(); 4280 } 4281 if (handled) { 4282 performHapticFeedback(HapticFeedbackConstants.LONG_PRESS); 4283 } 4284 return handled; 4285 } 4286 4287 /** 4288 * Performs button-related actions during a touch down event. 4289 * 4290 * @param event The event. 4291 * @return True if the down was consumed. 4292 * 4293 * @hide 4294 */ 4295 protected boolean performButtonActionOnTouchDown(MotionEvent event) { 4296 if ((event.getButtonState() & MotionEvent.BUTTON_SECONDARY) != 0) { 4297 if (showContextMenu(event.getX(), event.getY(), event.getMetaState())) { 4298 return true; 4299 } 4300 } 4301 return false; 4302 } 4303 4304 /** 4305 * Bring up the context menu for this view. 4306 * 4307 * @return Whether a context menu was displayed. 4308 */ 4309 public boolean showContextMenu() { 4310 return getParent().showContextMenuForChild(this); 4311 } 4312 4313 /** 4314 * Bring up the context menu for this view, referring to the item under the specified point. 4315 * 4316 * @param x The referenced x coordinate. 4317 * @param y The referenced y coordinate. 4318 * @param metaState The keyboard modifiers that were pressed. 4319 * @return Whether a context menu was displayed. 4320 * 4321 * @hide 4322 */ 4323 public boolean showContextMenu(float x, float y, int metaState) { 4324 return showContextMenu(); 4325 } 4326 4327 /** 4328 * Start an action mode. 4329 * 4330 * @param callback Callback that will control the lifecycle of the action mode 4331 * @return The new action mode if it is started, null otherwise 4332 * 4333 * @see ActionMode 4334 */ 4335 public ActionMode startActionMode(ActionMode.Callback callback) { 4336 ViewParent parent = getParent(); 4337 if (parent == null) return null; 4338 return parent.startActionModeForChild(this, callback); 4339 } 4340 4341 /** 4342 * Register a callback to be invoked when a hardware key is pressed in this view. 4343 * Key presses in software input methods will generally not trigger the methods of 4344 * this listener. 4345 * @param l the key listener to attach to this view 4346 */ 4347 public void setOnKeyListener(OnKeyListener l) { 4348 getListenerInfo().mOnKeyListener = l; 4349 } 4350 4351 /** 4352 * Register a callback to be invoked when a touch event is sent to this view. 4353 * @param l the touch listener to attach to this view 4354 */ 4355 public void setOnTouchListener(OnTouchListener l) { 4356 getListenerInfo().mOnTouchListener = l; 4357 } 4358 4359 /** 4360 * Register a callback to be invoked when a generic motion event is sent to this view. 4361 * @param l the generic motion listener to attach to this view 4362 */ 4363 public void setOnGenericMotionListener(OnGenericMotionListener l) { 4364 getListenerInfo().mOnGenericMotionListener = l; 4365 } 4366 4367 /** 4368 * Register a callback to be invoked when a hover event is sent to this view. 4369 * @param l the hover listener to attach to this view 4370 */ 4371 public void setOnHoverListener(OnHoverListener l) { 4372 getListenerInfo().mOnHoverListener = l; 4373 } 4374 4375 /** 4376 * Register a drag event listener callback object for this View. The parameter is 4377 * an implementation of {@link android.view.View.OnDragListener}. To send a drag event to a 4378 * View, the system calls the 4379 * {@link android.view.View.OnDragListener#onDrag(View,DragEvent)} method. 4380 * @param l An implementation of {@link android.view.View.OnDragListener}. 4381 */ 4382 public void setOnDragListener(OnDragListener l) { 4383 getListenerInfo().mOnDragListener = l; 4384 } 4385 4386 /** 4387 * Give this view focus. This will cause 4388 * {@link #onFocusChanged(boolean, int, android.graphics.Rect)} to be called. 4389 * 4390 * Note: this does not check whether this {@link View} should get focus, it just 4391 * gives it focus no matter what. It should only be called internally by framework 4392 * code that knows what it is doing, namely {@link #requestFocus(int, Rect)}. 4393 * 4394 * @param direction values are {@link View#FOCUS_UP}, {@link View#FOCUS_DOWN}, 4395 * {@link View#FOCUS_LEFT} or {@link View#FOCUS_RIGHT}. This is the direction which 4396 * focus moved when requestFocus() is called. It may not always 4397 * apply, in which case use the default View.FOCUS_DOWN. 4398 * @param previouslyFocusedRect The rectangle of the view that had focus 4399 * prior in this View's coordinate system. 4400 */ 4401 void handleFocusGainInternal(int direction, Rect previouslyFocusedRect) { 4402 if (DBG) { 4403 System.out.println(this + " requestFocus()"); 4404 } 4405 4406 if ((mPrivateFlags & PFLAG_FOCUSED) == 0) { 4407 mPrivateFlags |= PFLAG_FOCUSED; 4408 4409 View oldFocus = (mAttachInfo != null) ? getRootView().findFocus() : null; 4410 4411 if (mParent != null) { 4412 mParent.requestChildFocus(this, this); 4413 } 4414 4415 if (mAttachInfo != null) { 4416 mAttachInfo.mTreeObserver.dispatchOnGlobalFocusChange(oldFocus, this); 4417 } 4418 4419 onFocusChanged(true, direction, previouslyFocusedRect); 4420 refreshDrawableState(); 4421 4422 if (AccessibilityManager.getInstance(mContext).isEnabled()) { 4423 notifyAccessibilityStateChanged(); 4424 } 4425 } 4426 } 4427 4428 /** 4429 * Request that a rectangle of this view be visible on the screen, 4430 * scrolling if necessary just enough. 4431 * 4432 * <p>A View should call this if it maintains some notion of which part 4433 * of its content is interesting. For example, a text editing view 4434 * should call this when its cursor moves. 4435 * 4436 * @param rectangle The rectangle. 4437 * @return Whether any parent scrolled. 4438 */ 4439 public boolean requestRectangleOnScreen(Rect rectangle) { 4440 return requestRectangleOnScreen(rectangle, false); 4441 } 4442 4443 /** 4444 * Request that a rectangle of this view be visible on the screen, 4445 * scrolling if necessary just enough. 4446 * 4447 * <p>A View should call this if it maintains some notion of which part 4448 * of its content is interesting. For example, a text editing view 4449 * should call this when its cursor moves. 4450 * 4451 * <p>When <code>immediate</code> is set to true, scrolling will not be 4452 * animated. 4453 * 4454 * @param rectangle The rectangle. 4455 * @param immediate True to forbid animated scrolling, false otherwise 4456 * @return Whether any parent scrolled. 4457 */ 4458 public boolean requestRectangleOnScreen(Rect rectangle, boolean immediate) { 4459 if (mParent == null) { 4460 return false; 4461 } 4462 4463 View child = this; 4464 4465 RectF position = (mAttachInfo != null) ? mAttachInfo.mTmpTransformRect : new RectF(); 4466 position.set(rectangle); 4467 4468 ViewParent parent = mParent; 4469 boolean scrolled = false; 4470 while (parent != null) { 4471 rectangle.set((int) position.left, (int) position.top, 4472 (int) position.right, (int) position.bottom); 4473 4474 scrolled |= parent.requestChildRectangleOnScreen(child, 4475 rectangle, immediate); 4476 4477 if (!child.hasIdentityMatrix()) { 4478 child.getMatrix().mapRect(position); 4479 } 4480 4481 position.offset(child.mLeft, child.mTop); 4482 4483 if (!(parent instanceof View)) { 4484 break; 4485 } 4486 4487 View parentView = (View) parent; 4488 4489 position.offset(-parentView.getScrollX(), -parentView.getScrollY()); 4490 4491 child = parentView; 4492 parent = child.getParent(); 4493 } 4494 4495 return scrolled; 4496 } 4497 4498 /** 4499 * Called when this view wants to give up focus. If focus is cleared 4500 * {@link #onFocusChanged(boolean, int, android.graphics.Rect)} is called. 4501 * <p> 4502 * <strong>Note:</strong> When a View clears focus the framework is trying 4503 * to give focus to the first focusable View from the top. Hence, if this 4504 * View is the first from the top that can take focus, then all callbacks 4505 * related to clearing focus will be invoked after wich the framework will 4506 * give focus to this view. 4507 * </p> 4508 */ 4509 public void clearFocus() { 4510 if (DBG) { 4511 System.out.println(this + " clearFocus()"); 4512 } 4513 4514 if ((mPrivateFlags & PFLAG_FOCUSED) != 0) { 4515 mPrivateFlags &= ~PFLAG_FOCUSED; 4516 4517 if (mParent != null) { 4518 mParent.clearChildFocus(this); 4519 } 4520 4521 onFocusChanged(false, 0, null); 4522 4523 refreshDrawableState(); 4524 4525 if (!rootViewRequestFocus()) { 4526 notifyGlobalFocusCleared(this); 4527 } 4528 4529 if (AccessibilityManager.getInstance(mContext).isEnabled()) { 4530 notifyAccessibilityStateChanged(); 4531 } 4532 } 4533 } 4534 4535 void notifyGlobalFocusCleared(View oldFocus) { 4536 if (oldFocus != null && mAttachInfo != null) { 4537 mAttachInfo.mTreeObserver.dispatchOnGlobalFocusChange(oldFocus, null); 4538 } 4539 } 4540 4541 boolean rootViewRequestFocus() { 4542 View root = getRootView(); 4543 if (root != null) { 4544 return root.requestFocus(); 4545 } 4546 return false; 4547 } 4548 4549 /** 4550 * Called internally by the view system when a new view is getting focus. 4551 * This is what clears the old focus. 4552 */ 4553 void unFocus() { 4554 if (DBG) { 4555 System.out.println(this + " unFocus()"); 4556 } 4557 4558 if ((mPrivateFlags & PFLAG_FOCUSED) != 0) { 4559 mPrivateFlags &= ~PFLAG_FOCUSED; 4560 4561 onFocusChanged(false, 0, null); 4562 refreshDrawableState(); 4563 4564 if (AccessibilityManager.getInstance(mContext).isEnabled()) { 4565 notifyAccessibilityStateChanged(); 4566 } 4567 } 4568 } 4569 4570 /** 4571 * Returns true if this view has focus iteself, or is the ancestor of the 4572 * view that has focus. 4573 * 4574 * @return True if this view has or contains focus, false otherwise. 4575 */ 4576 @ViewDebug.ExportedProperty(category = "focus") 4577 public boolean hasFocus() { 4578 return (mPrivateFlags & PFLAG_FOCUSED) != 0; 4579 } 4580 4581 /** 4582 * Returns true if this view is focusable or if it contains a reachable View 4583 * for which {@link #hasFocusable()} returns true. A "reachable hasFocusable()" 4584 * is a View whose parents do not block descendants focus. 4585 * 4586 * Only {@link #VISIBLE} views are considered focusable. 4587 * 4588 * @return True if the view is focusable or if the view contains a focusable 4589 * View, false otherwise. 4590 * 4591 * @see ViewGroup#FOCUS_BLOCK_DESCENDANTS 4592 */ 4593 public boolean hasFocusable() { 4594 return (mViewFlags & VISIBILITY_MASK) == VISIBLE && isFocusable(); 4595 } 4596 4597 /** 4598 * Called by the view system when the focus state of this view changes. 4599 * When the focus change event is caused by directional navigation, direction 4600 * and previouslyFocusedRect provide insight into where the focus is coming from. 4601 * When overriding, be sure to call up through to the super class so that 4602 * the standard focus handling will occur. 4603 * 4604 * @param gainFocus True if the View has focus; false otherwise. 4605 * @param direction The direction focus has moved when requestFocus() 4606 * is called to give this view focus. Values are 4607 * {@link #FOCUS_UP}, {@link #FOCUS_DOWN}, {@link #FOCUS_LEFT}, 4608 * {@link #FOCUS_RIGHT}, {@link #FOCUS_FORWARD}, or {@link #FOCUS_BACKWARD}. 4609 * It may not always apply, in which case use the default. 4610 * @param previouslyFocusedRect The rectangle, in this view's coordinate 4611 * system, of the previously focused view. If applicable, this will be 4612 * passed in as finer grained information about where the focus is coming 4613 * from (in addition to direction). Will be <code>null</code> otherwise. 4614 */ 4615 protected void onFocusChanged(boolean gainFocus, int direction, Rect previouslyFocusedRect) { 4616 if (gainFocus) { 4617 if (AccessibilityManager.getInstance(mContext).isEnabled()) { 4618 sendAccessibilityEvent(AccessibilityEvent.TYPE_VIEW_FOCUSED); 4619 } 4620 } 4621 4622 InputMethodManager imm = InputMethodManager.peekInstance(); 4623 if (!gainFocus) { 4624 if (isPressed()) { 4625 setPressed(false); 4626 } 4627 if (imm != null && mAttachInfo != null 4628 && mAttachInfo.mHasWindowFocus) { 4629 imm.focusOut(this); 4630 } 4631 onFocusLost(); 4632 } else if (imm != null && mAttachInfo != null 4633 && mAttachInfo.mHasWindowFocus) { 4634 imm.focusIn(this); 4635 } 4636 4637 invalidate(true); 4638 ListenerInfo li = mListenerInfo; 4639 if (li != null && li.mOnFocusChangeListener != null) { 4640 li.mOnFocusChangeListener.onFocusChange(this, gainFocus); 4641 } 4642 4643 if (mAttachInfo != null) { 4644 mAttachInfo.mKeyDispatchState.reset(this); 4645 } 4646 } 4647 4648 /** 4649 * Sends an accessibility event of the given type. If accessibility is 4650 * not enabled this method has no effect. The default implementation calls 4651 * {@link #onInitializeAccessibilityEvent(AccessibilityEvent)} first 4652 * to populate information about the event source (this View), then calls 4653 * {@link #dispatchPopulateAccessibilityEvent(AccessibilityEvent)} to 4654 * populate the text content of the event source including its descendants, 4655 * and last calls 4656 * {@link ViewParent#requestSendAccessibilityEvent(View, AccessibilityEvent)} 4657 * on its parent to resuest sending of the event to interested parties. 4658 * <p> 4659 * If an {@link AccessibilityDelegate} has been specified via calling 4660 * {@link #setAccessibilityDelegate(AccessibilityDelegate)} its 4661 * {@link AccessibilityDelegate#sendAccessibilityEvent(View, int)} is 4662 * responsible for handling this call. 4663 * </p> 4664 * 4665 * @param eventType The type of the event to send, as defined by several types from 4666 * {@link android.view.accessibility.AccessibilityEvent}, such as 4667 * {@link android.view.accessibility.AccessibilityEvent#TYPE_VIEW_CLICKED} or 4668 * {@link android.view.accessibility.AccessibilityEvent#TYPE_VIEW_HOVER_ENTER}. 4669 * 4670 * @see #onInitializeAccessibilityEvent(AccessibilityEvent) 4671 * @see #dispatchPopulateAccessibilityEvent(AccessibilityEvent) 4672 * @see ViewParent#requestSendAccessibilityEvent(View, AccessibilityEvent) 4673 * @see AccessibilityDelegate 4674 */ 4675 public void sendAccessibilityEvent(int eventType) { 4676 if (mAccessibilityDelegate != null) { 4677 mAccessibilityDelegate.sendAccessibilityEvent(this, eventType); 4678 } else { 4679 sendAccessibilityEventInternal(eventType); 4680 } 4681 } 4682 4683 /** 4684 * Convenience method for sending a {@link AccessibilityEvent#TYPE_ANNOUNCEMENT} 4685 * {@link AccessibilityEvent} to make an announcement which is related to some 4686 * sort of a context change for which none of the events representing UI transitions 4687 * is a good fit. For example, announcing a new page in a book. If accessibility 4688 * is not enabled this method does nothing. 4689 * 4690 * @param text The announcement text. 4691 */ 4692 public void announceForAccessibility(CharSequence text) { 4693 if (AccessibilityManager.getInstance(mContext).isEnabled() && mParent != null) { 4694 AccessibilityEvent event = AccessibilityEvent.obtain( 4695 AccessibilityEvent.TYPE_ANNOUNCEMENT); 4696 onInitializeAccessibilityEvent(event); 4697 event.getText().add(text); 4698 event.setContentDescription(null); 4699 mParent.requestSendAccessibilityEvent(this, event); 4700 } 4701 } 4702 4703 /** 4704 * @see #sendAccessibilityEvent(int) 4705 * 4706 * Note: Called from the default {@link AccessibilityDelegate}. 4707 */ 4708 void sendAccessibilityEventInternal(int eventType) { 4709 if (AccessibilityManager.getInstance(mContext).isEnabled()) { 4710 sendAccessibilityEventUnchecked(AccessibilityEvent.obtain(eventType)); 4711 } 4712 } 4713 4714 /** 4715 * This method behaves exactly as {@link #sendAccessibilityEvent(int)} but 4716 * takes as an argument an empty {@link AccessibilityEvent} and does not 4717 * perform a check whether accessibility is enabled. 4718 * <p> 4719 * If an {@link AccessibilityDelegate} has been specified via calling 4720 * {@link #setAccessibilityDelegate(AccessibilityDelegate)} its 4721 * {@link AccessibilityDelegate#sendAccessibilityEventUnchecked(View, AccessibilityEvent)} 4722 * is responsible for handling this call. 4723 * </p> 4724 * 4725 * @param event The event to send. 4726 * 4727 * @see #sendAccessibilityEvent(int) 4728 */ 4729 public void sendAccessibilityEventUnchecked(AccessibilityEvent event) { 4730 if (mAccessibilityDelegate != null) { 4731 mAccessibilityDelegate.sendAccessibilityEventUnchecked(this, event); 4732 } else { 4733 sendAccessibilityEventUncheckedInternal(event); 4734 } 4735 } 4736 4737 /** 4738 * @see #sendAccessibilityEventUnchecked(AccessibilityEvent) 4739 * 4740 * Note: Called from the default {@link AccessibilityDelegate}. 4741 */ 4742 void sendAccessibilityEventUncheckedInternal(AccessibilityEvent event) { 4743 if (!isShown()) { 4744 return; 4745 } 4746 onInitializeAccessibilityEvent(event); 4747 // Only a subset of accessibility events populates text content. 4748 if ((event.getEventType() & POPULATING_ACCESSIBILITY_EVENT_TYPES) != 0) { 4749 dispatchPopulateAccessibilityEvent(event); 4750 } 4751 // In the beginning we called #isShown(), so we know that getParent() is not null. 4752 getParent().requestSendAccessibilityEvent(this, event); 4753 } 4754 4755 /** 4756 * Dispatches an {@link AccessibilityEvent} to the {@link View} first and then 4757 * to its children for adding their text content to the event. Note that the 4758 * event text is populated in a separate dispatch path since we add to the 4759 * event not only the text of the source but also the text of all its descendants. 4760 * A typical implementation will call 4761 * {@link #onPopulateAccessibilityEvent(AccessibilityEvent)} on the this view 4762 * and then call the {@link #dispatchPopulateAccessibilityEvent(AccessibilityEvent)} 4763 * on each child. Override this method if custom population of the event text 4764 * content is required. 4765 * <p> 4766 * If an {@link AccessibilityDelegate} has been specified via calling 4767 * {@link #setAccessibilityDelegate(AccessibilityDelegate)} its 4768 * {@link AccessibilityDelegate#dispatchPopulateAccessibilityEvent(View, AccessibilityEvent)} 4769 * is responsible for handling this call. 4770 * </p> 4771 * <p> 4772 * <em>Note:</em> Accessibility events of certain types are not dispatched for 4773 * populating the event text via this method. For details refer to {@link AccessibilityEvent}. 4774 * </p> 4775 * 4776 * @param event The event. 4777 * 4778 * @return True if the event population was completed. 4779 */ 4780 public boolean dispatchPopulateAccessibilityEvent(AccessibilityEvent event) { 4781 if (mAccessibilityDelegate != null) { 4782 return mAccessibilityDelegate.dispatchPopulateAccessibilityEvent(this, event); 4783 } else { 4784 return dispatchPopulateAccessibilityEventInternal(event); 4785 } 4786 } 4787 4788 /** 4789 * @see #dispatchPopulateAccessibilityEvent(AccessibilityEvent) 4790 * 4791 * Note: Called from the default {@link AccessibilityDelegate}. 4792 */ 4793 boolean dispatchPopulateAccessibilityEventInternal(AccessibilityEvent event) { 4794 onPopulateAccessibilityEvent(event); 4795 return false; 4796 } 4797 4798 /** 4799 * Called from {@link #dispatchPopulateAccessibilityEvent(AccessibilityEvent)} 4800 * giving a chance to this View to populate the accessibility event with its 4801 * text content. While this method is free to modify event 4802 * attributes other than text content, doing so should normally be performed in 4803 * {@link #onInitializeAccessibilityEvent(AccessibilityEvent)}. 4804 * <p> 4805 * Example: Adding formatted date string to an accessibility event in addition 4806 * to the text added by the super implementation: 4807 * <pre> public void onPopulateAccessibilityEvent(AccessibilityEvent event) { 4808 * super.onPopulateAccessibilityEvent(event); 4809 * final int flags = DateUtils.FORMAT_SHOW_DATE | DateUtils.FORMAT_SHOW_WEEKDAY; 4810 * String selectedDateUtterance = DateUtils.formatDateTime(mContext, 4811 * mCurrentDate.getTimeInMillis(), flags); 4812 * event.getText().add(selectedDateUtterance); 4813 * }</pre> 4814 * <p> 4815 * If an {@link AccessibilityDelegate} has been specified via calling 4816 * {@link #setAccessibilityDelegate(AccessibilityDelegate)} its 4817 * {@link AccessibilityDelegate#onPopulateAccessibilityEvent(View, AccessibilityEvent)} 4818 * is responsible for handling this call. 4819 * </p> 4820 * <p class="note"><strong>Note:</strong> Always call the super implementation before adding 4821 * information to the event, in case the default implementation has basic information to add. 4822 * </p> 4823 * 4824 * @param event The accessibility event which to populate. 4825 * 4826 * @see #sendAccessibilityEvent(int) 4827 * @see #dispatchPopulateAccessibilityEvent(AccessibilityEvent) 4828 */ 4829 public void onPopulateAccessibilityEvent(AccessibilityEvent event) { 4830 if (mAccessibilityDelegate != null) { 4831 mAccessibilityDelegate.onPopulateAccessibilityEvent(this, event); 4832 } else { 4833 onPopulateAccessibilityEventInternal(event); 4834 } 4835 } 4836 4837 /** 4838 * @see #onPopulateAccessibilityEvent(AccessibilityEvent) 4839 * 4840 * Note: Called from the default {@link AccessibilityDelegate}. 4841 */ 4842 void onPopulateAccessibilityEventInternal(AccessibilityEvent event) { 4843 4844 } 4845 4846 /** 4847 * Initializes an {@link AccessibilityEvent} with information about 4848 * this View which is the event source. In other words, the source of 4849 * an accessibility event is the view whose state change triggered firing 4850 * the event. 4851 * <p> 4852 * Example: Setting the password property of an event in addition 4853 * to properties set by the super implementation: 4854 * <pre> public void onInitializeAccessibilityEvent(AccessibilityEvent event) { 4855 * super.onInitializeAccessibilityEvent(event); 4856 * event.setPassword(true); 4857 * }</pre> 4858 * <p> 4859 * If an {@link AccessibilityDelegate} has been specified via calling 4860 * {@link #setAccessibilityDelegate(AccessibilityDelegate)} its 4861 * {@link AccessibilityDelegate#onInitializeAccessibilityEvent(View, AccessibilityEvent)} 4862 * is responsible for handling this call. 4863 * </p> 4864 * <p class="note"><strong>Note:</strong> Always call the super implementation before adding 4865 * information to the event, in case the default implementation has basic information to add. 4866 * </p> 4867 * @param event The event to initialize. 4868 * 4869 * @see #sendAccessibilityEvent(int) 4870 * @see #dispatchPopulateAccessibilityEvent(AccessibilityEvent) 4871 */ 4872 public void onInitializeAccessibilityEvent(AccessibilityEvent event) { 4873 if (mAccessibilityDelegate != null) { 4874 mAccessibilityDelegate.onInitializeAccessibilityEvent(this, event); 4875 } else { 4876 onInitializeAccessibilityEventInternal(event); 4877 } 4878 } 4879 4880 /** 4881 * @see #onInitializeAccessibilityEvent(AccessibilityEvent) 4882 * 4883 * Note: Called from the default {@link AccessibilityDelegate}. 4884 */ 4885 void onInitializeAccessibilityEventInternal(AccessibilityEvent event) { 4886 event.setSource(this); 4887 event.setClassName(View.class.getName()); 4888 event.setPackageName(getContext().getPackageName()); 4889 event.setEnabled(isEnabled()); 4890 event.setContentDescription(mContentDescription); 4891 4892 switch (event.getEventType()) { 4893 case AccessibilityEvent.TYPE_VIEW_FOCUSED: { 4894 ArrayList<View> focusablesTempList = (mAttachInfo != null) 4895 ? mAttachInfo.mTempArrayList : new ArrayList<View>(); 4896 getRootView().addFocusables(focusablesTempList, View.FOCUS_FORWARD, FOCUSABLES_ALL); 4897 event.setItemCount(focusablesTempList.size()); 4898 event.setCurrentItemIndex(focusablesTempList.indexOf(this)); 4899 if (mAttachInfo != null) { 4900 focusablesTempList.clear(); 4901 } 4902 } break; 4903 case AccessibilityEvent.TYPE_VIEW_TEXT_SELECTION_CHANGED: { 4904 CharSequence text = getIterableTextForAccessibility(); 4905 if (text != null && text.length() > 0) { 4906 event.setFromIndex(getAccessibilitySelectionStart()); 4907 event.setToIndex(getAccessibilitySelectionEnd()); 4908 event.setItemCount(text.length()); 4909 } 4910 } break; 4911 } 4912 } 4913 4914 /** 4915 * Returns an {@link AccessibilityNodeInfo} representing this view from the 4916 * point of view of an {@link android.accessibilityservice.AccessibilityService}. 4917 * This method is responsible for obtaining an accessibility node info from a 4918 * pool of reusable instances and calling 4919 * {@link #onInitializeAccessibilityNodeInfo(AccessibilityNodeInfo)} on this view to 4920 * initialize the former. 4921 * <p> 4922 * Note: The client is responsible for recycling the obtained instance by calling 4923 * {@link AccessibilityNodeInfo#recycle()} to minimize object creation. 4924 * </p> 4925 * 4926 * @return A populated {@link AccessibilityNodeInfo}. 4927 * 4928 * @see AccessibilityNodeInfo 4929 */ 4930 public AccessibilityNodeInfo createAccessibilityNodeInfo() { 4931 if (mAccessibilityDelegate != null) { 4932 return mAccessibilityDelegate.createAccessibilityNodeInfo(this); 4933 } else { 4934 return createAccessibilityNodeInfoInternal(); 4935 } 4936 } 4937 4938 /** 4939 * @see #createAccessibilityNodeInfo() 4940 */ 4941 AccessibilityNodeInfo createAccessibilityNodeInfoInternal() { 4942 AccessibilityNodeProvider provider = getAccessibilityNodeProvider(); 4943 if (provider != null) { 4944 return provider.createAccessibilityNodeInfo(View.NO_ID); 4945 } else { 4946 AccessibilityNodeInfo info = AccessibilityNodeInfo.obtain(this); 4947 onInitializeAccessibilityNodeInfo(info); 4948 return info; 4949 } 4950 } 4951 4952 /** 4953 * Initializes an {@link AccessibilityNodeInfo} with information about this view. 4954 * The base implementation sets: 4955 * <ul> 4956 * <li>{@link AccessibilityNodeInfo#setParent(View)},</li> 4957 * <li>{@link AccessibilityNodeInfo#setBoundsInParent(Rect)},</li> 4958 * <li>{@link AccessibilityNodeInfo#setBoundsInScreen(Rect)},</li> 4959 * <li>{@link AccessibilityNodeInfo#setPackageName(CharSequence)},</li> 4960 * <li>{@link AccessibilityNodeInfo#setClassName(CharSequence)},</li> 4961 * <li>{@link AccessibilityNodeInfo#setContentDescription(CharSequence)},</li> 4962 * <li>{@link AccessibilityNodeInfo#setEnabled(boolean)},</li> 4963 * <li>{@link AccessibilityNodeInfo#setClickable(boolean)},</li> 4964 * <li>{@link AccessibilityNodeInfo#setFocusable(boolean)},</li> 4965 * <li>{@link AccessibilityNodeInfo#setFocused(boolean)},</li> 4966 * <li>{@link AccessibilityNodeInfo#setLongClickable(boolean)},</li> 4967 * <li>{@link AccessibilityNodeInfo#setSelected(boolean)},</li> 4968 * </ul> 4969 * <p> 4970 * Subclasses should override this method, call the super implementation, 4971 * and set additional attributes. 4972 * </p> 4973 * <p> 4974 * If an {@link AccessibilityDelegate} has been specified via calling 4975 * {@link #setAccessibilityDelegate(AccessibilityDelegate)} its 4976 * {@link AccessibilityDelegate#onInitializeAccessibilityNodeInfo(View, AccessibilityNodeInfo)} 4977 * is responsible for handling this call. 4978 * </p> 4979 * 4980 * @param info The instance to initialize. 4981 */ 4982 public void onInitializeAccessibilityNodeInfo(AccessibilityNodeInfo info) { 4983 if (mAccessibilityDelegate != null) { 4984 mAccessibilityDelegate.onInitializeAccessibilityNodeInfo(this, info); 4985 } else { 4986 onInitializeAccessibilityNodeInfoInternal(info); 4987 } 4988 } 4989 4990 /** 4991 * Gets the location of this view in screen coordintates. 4992 * 4993 * @param outRect The output location 4994 */ 4995 void getBoundsOnScreen(Rect outRect) { 4996 if (mAttachInfo == null) { 4997 return; 4998 } 4999 5000 RectF position = mAttachInfo.mTmpTransformRect; 5001 position.set(0, 0, mRight - mLeft, mBottom - mTop); 5002 5003 if (!hasIdentityMatrix()) { 5004 getMatrix().mapRect(position); 5005 } 5006 5007 position.offset(mLeft, mTop); 5008 5009 ViewParent parent = mParent; 5010 while (parent instanceof View) { 5011 View parentView = (View) parent; 5012 5013 position.offset(-parentView.mScrollX, -parentView.mScrollY); 5014 5015 if (!parentView.hasIdentityMatrix()) { 5016 parentView.getMatrix().mapRect(position); 5017 } 5018 5019 position.offset(parentView.mLeft, parentView.mTop); 5020 5021 parent = parentView.mParent; 5022 } 5023 5024 if (parent instanceof ViewRootImpl) { 5025 ViewRootImpl viewRootImpl = (ViewRootImpl) parent; 5026 position.offset(0, -viewRootImpl.mCurScrollY); 5027 } 5028 5029 position.offset(mAttachInfo.mWindowLeft, mAttachInfo.mWindowTop); 5030 5031 outRect.set((int) (position.left + 0.5f), (int) (position.top + 0.5f), 5032 (int) (position.right + 0.5f), (int) (position.bottom + 0.5f)); 5033 } 5034 5035 /** 5036 * @see #onInitializeAccessibilityNodeInfo(AccessibilityNodeInfo) 5037 * 5038 * Note: Called from the default {@link AccessibilityDelegate}. 5039 */ 5040 void onInitializeAccessibilityNodeInfoInternal(AccessibilityNodeInfo info) { 5041 Rect bounds = mAttachInfo.mTmpInvalRect; 5042 5043 getDrawingRect(bounds); 5044 info.setBoundsInParent(bounds); 5045 5046 getBoundsOnScreen(bounds); 5047 info.setBoundsInScreen(bounds); 5048 5049 ViewParent parent = getParentForAccessibility(); 5050 if (parent instanceof View) { 5051 info.setParent((View) parent); 5052 } 5053 5054 if (mID != View.NO_ID) { 5055 View rootView = getRootView(); 5056 if (rootView == null) { 5057 rootView = this; 5058 } 5059 View label = rootView.findLabelForView(this, mID); 5060 if (label != null) { 5061 info.setLabeledBy(label); 5062 } 5063 5064 if ((mAttachInfo.mAccessibilityFetchFlags 5065 & AccessibilityNodeInfo.FLAG_REPORT_VIEW_IDS) != 0 5066 && Resources.resourceHasPackage(mID)) { 5067 try { 5068 String viewId = getResources().getResourceName(mID); 5069 info.setViewIdResourceName(viewId); 5070 } catch (Resources.NotFoundException nfe) { 5071 /* ignore */ 5072 } 5073 } 5074 } 5075 5076 if (mLabelForId != View.NO_ID) { 5077 View rootView = getRootView(); 5078 if (rootView == null) { 5079 rootView = this; 5080 } 5081 View labeled = rootView.findViewInsideOutShouldExist(this, mLabelForId); 5082 if (labeled != null) { 5083 info.setLabelFor(labeled); 5084 } 5085 } 5086 5087 info.setVisibleToUser(isVisibleToUser()); 5088 5089 info.setPackageName(mContext.getPackageName()); 5090 info.setClassName(View.class.getName()); 5091 info.setContentDescription(getContentDescription()); 5092 5093 info.setEnabled(isEnabled()); 5094 info.setClickable(isClickable()); 5095 info.setFocusable(isFocusable()); 5096 info.setFocused(isFocused()); 5097 info.setAccessibilityFocused(isAccessibilityFocused()); 5098 info.setSelected(isSelected()); 5099 info.setLongClickable(isLongClickable()); 5100 5101 // TODO: These make sense only if we are in an AdapterView but all 5102 // views can be selected. Maybe from accessibility perspective 5103 // we should report as selectable view in an AdapterView. 5104 info.addAction(AccessibilityNodeInfo.ACTION_SELECT); 5105 info.addAction(AccessibilityNodeInfo.ACTION_CLEAR_SELECTION); 5106 5107 if (isFocusable()) { 5108 if (isFocused()) { 5109 info.addAction(AccessibilityNodeInfo.ACTION_CLEAR_FOCUS); 5110 } else { 5111 info.addAction(AccessibilityNodeInfo.ACTION_FOCUS); 5112 } 5113 } 5114 5115 if (!isAccessibilityFocused()) { 5116 info.addAction(AccessibilityNodeInfo.ACTION_ACCESSIBILITY_FOCUS); 5117 } else { 5118 info.addAction(AccessibilityNodeInfo.ACTION_CLEAR_ACCESSIBILITY_FOCUS); 5119 } 5120 5121 if (isClickable() && isEnabled()) { 5122 info.addAction(AccessibilityNodeInfo.ACTION_CLICK); 5123 } 5124 5125 if (isLongClickable() && isEnabled()) { 5126 info.addAction(AccessibilityNodeInfo.ACTION_LONG_CLICK); 5127 } 5128 5129 CharSequence text = getIterableTextForAccessibility(); 5130 if (text != null && text.length() > 0) { 5131 info.setTextSelection(getAccessibilitySelectionStart(), getAccessibilitySelectionEnd()); 5132 5133 info.addAction(AccessibilityNodeInfo.ACTION_SET_SELECTION); 5134 info.addAction(AccessibilityNodeInfo.ACTION_NEXT_AT_MOVEMENT_GRANULARITY); 5135 info.addAction(AccessibilityNodeInfo.ACTION_PREVIOUS_AT_MOVEMENT_GRANULARITY); 5136 info.setMovementGranularities(AccessibilityNodeInfo.MOVEMENT_GRANULARITY_CHARACTER 5137 | AccessibilityNodeInfo.MOVEMENT_GRANULARITY_WORD 5138 | AccessibilityNodeInfo.MOVEMENT_GRANULARITY_PARAGRAPH); 5139 } 5140 } 5141 5142 private View findLabelForView(View view, int labeledId) { 5143 if (mMatchLabelForPredicate == null) { 5144 mMatchLabelForPredicate = new MatchLabelForPredicate(); 5145 } 5146 mMatchLabelForPredicate.mLabeledId = labeledId; 5147 return findViewByPredicateInsideOut(view, mMatchLabelForPredicate); 5148 } 5149 5150 /** 5151 * Computes whether this view is visible to the user. Such a view is 5152 * attached, visible, all its predecessors are visible, it is not clipped 5153 * entirely by its predecessors, and has an alpha greater than zero. 5154 * 5155 * @return Whether the view is visible on the screen. 5156 * 5157 * @hide 5158 */ 5159 protected boolean isVisibleToUser() { 5160 return isVisibleToUser(null); 5161 } 5162 5163 /** 5164 * Computes whether the given portion of this view is visible to the user. 5165 * Such a view is attached, visible, all its predecessors are visible, 5166 * has an alpha greater than zero, and the specified portion is not 5167 * clipped entirely by its predecessors. 5168 * 5169 * @param boundInView the portion of the view to test; coordinates should be relative; may be 5170 * <code>null</code>, and the entire view will be tested in this case. 5171 * When <code>true</code> is returned by the function, the actual visible 5172 * region will be stored in this parameter; that is, if boundInView is fully 5173 * contained within the view, no modification will be made, otherwise regions 5174 * outside of the visible area of the view will be clipped. 5175 * 5176 * @return Whether the specified portion of the view is visible on the screen. 5177 * 5178 * @hide 5179 */ 5180 protected boolean isVisibleToUser(Rect boundInView) { 5181 if (mAttachInfo != null) { 5182 // Attached to invisible window means this view is not visible. 5183 if (mAttachInfo.mWindowVisibility != View.VISIBLE) { 5184 return false; 5185 } 5186 // An invisible predecessor or one with alpha zero means 5187 // that this view is not visible to the user. 5188 Object current = this; 5189 while (current instanceof View) { 5190 View view = (View) current; 5191 // We have attach info so this view is attached and there is no 5192 // need to check whether we reach to ViewRootImpl on the way up. 5193 if (view.getAlpha() <= 0 || view.getVisibility() != VISIBLE) { 5194 return false; 5195 } 5196 current = view.mParent; 5197 } 5198 // Check if the view is entirely covered by its predecessors. 5199 Rect visibleRect = mAttachInfo.mTmpInvalRect; 5200 Point offset = mAttachInfo.mPoint; 5201 if (!getGlobalVisibleRect(visibleRect, offset)) { 5202 return false; 5203 } 5204 // Check if the visible portion intersects the rectangle of interest. 5205 if (boundInView != null) { 5206 visibleRect.offset(-offset.x, -offset.y); 5207 return boundInView.intersect(visibleRect); 5208 } 5209 return true; 5210 } 5211 return false; 5212 } 5213 5214 /** 5215 * Returns the delegate for implementing accessibility support via 5216 * composition. For more details see {@link AccessibilityDelegate}. 5217 * 5218 * @return The delegate, or null if none set. 5219 * 5220 * @hide 5221 */ 5222 public AccessibilityDelegate getAccessibilityDelegate() { 5223 return mAccessibilityDelegate; 5224 } 5225 5226 /** 5227 * Sets a delegate for implementing accessibility support via composition as 5228 * opposed to inheritance. The delegate's primary use is for implementing 5229 * backwards compatible widgets. For more details see {@link AccessibilityDelegate}. 5230 * 5231 * @param delegate The delegate instance. 5232 * 5233 * @see AccessibilityDelegate 5234 */ 5235 public void setAccessibilityDelegate(AccessibilityDelegate delegate) { 5236 mAccessibilityDelegate = delegate; 5237 } 5238 5239 /** 5240 * Gets the provider for managing a virtual view hierarchy rooted at this View 5241 * and reported to {@link android.accessibilityservice.AccessibilityService}s 5242 * that explore the window content. 5243 * <p> 5244 * If this method returns an instance, this instance is responsible for managing 5245 * {@link AccessibilityNodeInfo}s describing the virtual sub-tree rooted at this 5246 * View including the one representing the View itself. Similarly the returned 5247 * instance is responsible for performing accessibility actions on any virtual 5248 * view or the root view itself. 5249 * </p> 5250 * <p> 5251 * If an {@link AccessibilityDelegate} has been specified via calling 5252 * {@link #setAccessibilityDelegate(AccessibilityDelegate)} its 5253 * {@link AccessibilityDelegate#getAccessibilityNodeProvider(View)} 5254 * is responsible for handling this call. 5255 * </p> 5256 * 5257 * @return The provider. 5258 * 5259 * @see AccessibilityNodeProvider 5260 */ 5261 public AccessibilityNodeProvider getAccessibilityNodeProvider() { 5262 if (mAccessibilityDelegate != null) { 5263 return mAccessibilityDelegate.getAccessibilityNodeProvider(this); 5264 } else { 5265 return null; 5266 } 5267 } 5268 5269 /** 5270 * Gets the unique identifier of this view on the screen for accessibility purposes. 5271 * If this {@link View} is not attached to any window, {@value #NO_ID} is returned. 5272 * 5273 * @return The view accessibility id. 5274 * 5275 * @hide 5276 */ 5277 public int getAccessibilityViewId() { 5278 if (mAccessibilityViewId == NO_ID) { 5279 mAccessibilityViewId = sNextAccessibilityViewId++; 5280 } 5281 return mAccessibilityViewId; 5282 } 5283 5284 /** 5285 * Gets the unique identifier of the window in which this View reseides. 5286 * 5287 * @return The window accessibility id. 5288 * 5289 * @hide 5290 */ 5291 public int getAccessibilityWindowId() { 5292 return mAttachInfo != null ? mAttachInfo.mAccessibilityWindowId : NO_ID; 5293 } 5294 5295 /** 5296 * Gets the {@link View} description. It briefly describes the view and is 5297 * primarily used for accessibility support. Set this property to enable 5298 * better accessibility support for your application. This is especially 5299 * true for views that do not have textual representation (For example, 5300 * ImageButton). 5301 * 5302 * @return The content description. 5303 * 5304 * @attr ref android.R.styleable#View_contentDescription 5305 */ 5306 @ViewDebug.ExportedProperty(category = "accessibility") 5307 public CharSequence getContentDescription() { 5308 return mContentDescription; 5309 } 5310 5311 /** 5312 * Sets the {@link View} description. It briefly describes the view and is 5313 * primarily used for accessibility support. Set this property to enable 5314 * better accessibility support for your application. This is especially 5315 * true for views that do not have textual representation (For example, 5316 * ImageButton). 5317 * 5318 * @param contentDescription The content description. 5319 * 5320 * @attr ref android.R.styleable#View_contentDescription 5321 */ 5322 @RemotableViewMethod 5323 public void setContentDescription(CharSequence contentDescription) { 5324 if (mContentDescription == null) { 5325 if (contentDescription == null) { 5326 return; 5327 } 5328 } else if (mContentDescription.equals(contentDescription)) { 5329 return; 5330 } 5331 mContentDescription = contentDescription; 5332 final boolean nonEmptyDesc = contentDescription != null && contentDescription.length() > 0; 5333 if (nonEmptyDesc && getImportantForAccessibility() == IMPORTANT_FOR_ACCESSIBILITY_AUTO) { 5334 setImportantForAccessibility(IMPORTANT_FOR_ACCESSIBILITY_YES); 5335 } 5336 notifyAccessibilityStateChanged(); 5337 } 5338 5339 /** 5340 * Gets the id of a view for which this view serves as a label for 5341 * accessibility purposes. 5342 * 5343 * @return The labeled view id. 5344 */ 5345 @ViewDebug.ExportedProperty(category = "accessibility") 5346 public int getLabelFor() { 5347 return mLabelForId; 5348 } 5349 5350 /** 5351 * Sets the id of a view for which this view serves as a label for 5352 * accessibility purposes. 5353 * 5354 * @param id The labeled view id. 5355 */ 5356 @RemotableViewMethod 5357 public void setLabelFor(int id) { 5358 mLabelForId = id; 5359 if (mLabelForId != View.NO_ID 5360 && mID == View.NO_ID) { 5361 mID = generateViewId(); 5362 } 5363 } 5364 5365 /** 5366 * Invoked whenever this view loses focus, either by losing window focus or by losing 5367 * focus within its window. This method can be used to clear any state tied to the 5368 * focus. For instance, if a button is held pressed with the trackball and the window 5369 * loses focus, this method can be used to cancel the press. 5370 * 5371 * Subclasses of View overriding this method should always call super.onFocusLost(). 5372 * 5373 * @see #onFocusChanged(boolean, int, android.graphics.Rect) 5374 * @see #onWindowFocusChanged(boolean) 5375 * 5376 * @hide pending API council approval 5377 */ 5378 protected void onFocusLost() { 5379 resetPressedState(); 5380 } 5381 5382 private void resetPressedState() { 5383 if ((mViewFlags & ENABLED_MASK) == DISABLED) { 5384 return; 5385 } 5386 5387 if (isPressed()) { 5388 setPressed(false); 5389 5390 if (!mHasPerformedLongPress) { 5391 removeLongPressCallback(); 5392 } 5393 } 5394 } 5395 5396 /** 5397 * Returns true if this view has focus 5398 * 5399 * @return True if this view has focus, false otherwise. 5400 */ 5401 @ViewDebug.ExportedProperty(category = "focus") 5402 public boolean isFocused() { 5403 return (mPrivateFlags & PFLAG_FOCUSED) != 0; 5404 } 5405 5406 /** 5407 * Find the view in the hierarchy rooted at this view that currently has 5408 * focus. 5409 * 5410 * @return The view that currently has focus, or null if no focused view can 5411 * be found. 5412 */ 5413 public View findFocus() { 5414 return (mPrivateFlags & PFLAG_FOCUSED) != 0 ? this : null; 5415 } 5416 5417 /** 5418 * Indicates whether this view is one of the set of scrollable containers in 5419 * its window. 5420 * 5421 * @return whether this view is one of the set of scrollable containers in 5422 * its window 5423 * 5424 * @attr ref android.R.styleable#View_isScrollContainer 5425 */ 5426 public boolean isScrollContainer() { 5427 return (mPrivateFlags & PFLAG_SCROLL_CONTAINER_ADDED) != 0; 5428 } 5429 5430 /** 5431 * Change whether this view is one of the set of scrollable containers in 5432 * its window. This will be used to determine whether the window can 5433 * resize or must pan when a soft input area is open -- scrollable 5434 * containers allow the window to use resize mode since the container 5435 * will appropriately shrink. 5436 * 5437 * @attr ref android.R.styleable#View_isScrollContainer 5438 */ 5439 public void setScrollContainer(boolean isScrollContainer) { 5440 if (isScrollContainer) { 5441 if (mAttachInfo != null && (mPrivateFlags&PFLAG_SCROLL_CONTAINER_ADDED) == 0) { 5442 mAttachInfo.mScrollContainers.add(this); 5443 mPrivateFlags |= PFLAG_SCROLL_CONTAINER_ADDED; 5444 } 5445 mPrivateFlags |= PFLAG_SCROLL_CONTAINER; 5446 } else { 5447 if ((mPrivateFlags&PFLAG_SCROLL_CONTAINER_ADDED) != 0) { 5448 mAttachInfo.mScrollContainers.remove(this); 5449 } 5450 mPrivateFlags &= ~(PFLAG_SCROLL_CONTAINER|PFLAG_SCROLL_CONTAINER_ADDED); 5451 } 5452 } 5453 5454 /** 5455 * Returns the quality of the drawing cache. 5456 * 5457 * @return One of {@link #DRAWING_CACHE_QUALITY_AUTO}, 5458 * {@link #DRAWING_CACHE_QUALITY_LOW}, or {@link #DRAWING_CACHE_QUALITY_HIGH} 5459 * 5460 * @see #setDrawingCacheQuality(int) 5461 * @see #setDrawingCacheEnabled(boolean) 5462 * @see #isDrawingCacheEnabled() 5463 * 5464 * @attr ref android.R.styleable#View_drawingCacheQuality 5465 */ 5466 public int getDrawingCacheQuality() { 5467 return mViewFlags & DRAWING_CACHE_QUALITY_MASK; 5468 } 5469 5470 /** 5471 * Set the drawing cache quality of this view. This value is used only when the 5472 * drawing cache is enabled 5473 * 5474 * @param quality One of {@link #DRAWING_CACHE_QUALITY_AUTO}, 5475 * {@link #DRAWING_CACHE_QUALITY_LOW}, or {@link #DRAWING_CACHE_QUALITY_HIGH} 5476 * 5477 * @see #getDrawingCacheQuality() 5478 * @see #setDrawingCacheEnabled(boolean) 5479 * @see #isDrawingCacheEnabled() 5480 * 5481 * @attr ref android.R.styleable#View_drawingCacheQuality 5482 */ 5483 public void setDrawingCacheQuality(int quality) { 5484 setFlags(quality, DRAWING_CACHE_QUALITY_MASK); 5485 } 5486 5487 /** 5488 * Returns whether the screen should remain on, corresponding to the current 5489 * value of {@link #KEEP_SCREEN_ON}. 5490 * 5491 * @return Returns true if {@link #KEEP_SCREEN_ON} is set. 5492 * 5493 * @see #setKeepScreenOn(boolean) 5494 * 5495 * @attr ref android.R.styleable#View_keepScreenOn 5496 */ 5497 public boolean getKeepScreenOn() { 5498 return (mViewFlags & KEEP_SCREEN_ON) != 0; 5499 } 5500 5501 /** 5502 * Controls whether the screen should remain on, modifying the 5503 * value of {@link #KEEP_SCREEN_ON}. 5504 * 5505 * @param keepScreenOn Supply true to set {@link #KEEP_SCREEN_ON}. 5506 * 5507 * @see #getKeepScreenOn() 5508 * 5509 * @attr ref android.R.styleable#View_keepScreenOn 5510 */ 5511 public void setKeepScreenOn(boolean keepScreenOn) { 5512 setFlags(keepScreenOn ? KEEP_SCREEN_ON : 0, KEEP_SCREEN_ON); 5513 } 5514 5515 /** 5516 * Gets the id of the view to use when the next focus is {@link #FOCUS_LEFT}. 5517 * @return The next focus ID, or {@link #NO_ID} if the framework should decide automatically. 5518 * 5519 * @attr ref android.R.styleable#View_nextFocusLeft 5520 */ 5521 public int getNextFocusLeftId() { 5522 return mNextFocusLeftId; 5523 } 5524 5525 /** 5526 * Sets the id of the view to use when the next focus is {@link #FOCUS_LEFT}. 5527 * @param nextFocusLeftId The next focus ID, or {@link #NO_ID} if the framework should 5528 * decide automatically. 5529 * 5530 * @attr ref android.R.styleable#View_nextFocusLeft 5531 */ 5532 public void setNextFocusLeftId(int nextFocusLeftId) { 5533 mNextFocusLeftId = nextFocusLeftId; 5534 } 5535 5536 /** 5537 * Gets the id of the view to use when the next focus is {@link #FOCUS_RIGHT}. 5538 * @return The next focus ID, or {@link #NO_ID} if the framework should decide automatically. 5539 * 5540 * @attr ref android.R.styleable#View_nextFocusRight 5541 */ 5542 public int getNextFocusRightId() { 5543 return mNextFocusRightId; 5544 } 5545 5546 /** 5547 * Sets the id of the view to use when the next focus is {@link #FOCUS_RIGHT}. 5548 * @param nextFocusRightId The next focus ID, or {@link #NO_ID} if the framework should 5549 * decide automatically. 5550 * 5551 * @attr ref android.R.styleable#View_nextFocusRight 5552 */ 5553 public void setNextFocusRightId(int nextFocusRightId) { 5554 mNextFocusRightId = nextFocusRightId; 5555 } 5556 5557 /** 5558 * Gets the id of the view to use when the next focus is {@link #FOCUS_UP}. 5559 * @return The next focus ID, or {@link #NO_ID} if the framework should decide automatically. 5560 * 5561 * @attr ref android.R.styleable#View_nextFocusUp 5562 */ 5563 public int getNextFocusUpId() { 5564 return mNextFocusUpId; 5565 } 5566 5567 /** 5568 * Sets the id of the view to use when the next focus is {@link #FOCUS_UP}. 5569 * @param nextFocusUpId The next focus ID, or {@link #NO_ID} if the framework should 5570 * decide automatically. 5571 * 5572 * @attr ref android.R.styleable#View_nextFocusUp 5573 */ 5574 public void setNextFocusUpId(int nextFocusUpId) { 5575 mNextFocusUpId = nextFocusUpId; 5576 } 5577 5578 /** 5579 * Gets the id of the view to use when the next focus is {@link #FOCUS_DOWN}. 5580 * @return The next focus ID, or {@link #NO_ID} if the framework should decide automatically. 5581 * 5582 * @attr ref android.R.styleable#View_nextFocusDown 5583 */ 5584 public int getNextFocusDownId() { 5585 return mNextFocusDownId; 5586 } 5587 5588 /** 5589 * Sets the id of the view to use when the next focus is {@link #FOCUS_DOWN}. 5590 * @param nextFocusDownId The next focus ID, or {@link #NO_ID} if the framework should 5591 * decide automatically. 5592 * 5593 * @attr ref android.R.styleable#View_nextFocusDown 5594 */ 5595 public void setNextFocusDownId(int nextFocusDownId) { 5596 mNextFocusDownId = nextFocusDownId; 5597 } 5598 5599 /** 5600 * Gets the id of the view to use when the next focus is {@link #FOCUS_FORWARD}. 5601 * @return The next focus ID, or {@link #NO_ID} if the framework should decide automatically. 5602 * 5603 * @attr ref android.R.styleable#View_nextFocusForward 5604 */ 5605 public int getNextFocusForwardId() { 5606 return mNextFocusForwardId; 5607 } 5608 5609 /** 5610 * Sets the id of the view to use when the next focus is {@link #FOCUS_FORWARD}. 5611 * @param nextFocusForwardId The next focus ID, or {@link #NO_ID} if the framework should 5612 * decide automatically. 5613 * 5614 * @attr ref android.R.styleable#View_nextFocusForward 5615 */ 5616 public void setNextFocusForwardId(int nextFocusForwardId) { 5617 mNextFocusForwardId = nextFocusForwardId; 5618 } 5619 5620 /** 5621 * Returns the visibility of this view and all of its ancestors 5622 * 5623 * @return True if this view and all of its ancestors are {@link #VISIBLE} 5624 */ 5625 public boolean isShown() { 5626 View current = this; 5627 //noinspection ConstantConditions 5628 do { 5629 if ((current.mViewFlags & VISIBILITY_MASK) != VISIBLE) { 5630 return false; 5631 } 5632 ViewParent parent = current.mParent; 5633 if (parent == null) { 5634 return false; // We are not attached to the view root 5635 } 5636 if (!(parent instanceof View)) { 5637 return true; 5638 } 5639 current = (View) parent; 5640 } while (current != null); 5641 5642 return false; 5643 } 5644 5645 /** 5646 * Called by the view hierarchy when the content insets for a window have 5647 * changed, to allow it to adjust its content to fit within those windows. 5648 * The content insets tell you the space that the status bar, input method, 5649 * and other system windows infringe on the application's window. 5650 * 5651 * <p>You do not normally need to deal with this function, since the default 5652 * window decoration given to applications takes care of applying it to the 5653 * content of the window. If you use {@link #SYSTEM_UI_FLAG_LAYOUT_FULLSCREEN} 5654 * or {@link #SYSTEM_UI_FLAG_LAYOUT_HIDE_NAVIGATION} this will not be the case, 5655 * and your content can be placed under those system elements. You can then 5656 * use this method within your view hierarchy if you have parts of your UI 5657 * which you would like to ensure are not being covered. 5658 * 5659 * <p>The default implementation of this method simply applies the content 5660 * inset's to the view's padding, consuming that content (modifying the 5661 * insets to be 0), and returning true. This behavior is off by default, but can 5662 * be enabled through {@link #setFitsSystemWindows(boolean)}. 5663 * 5664 * <p>This function's traversal down the hierarchy is depth-first. The same content 5665 * insets object is propagated down the hierarchy, so any changes made to it will 5666 * be seen by all following views (including potentially ones above in 5667 * the hierarchy since this is a depth-first traversal). The first view 5668 * that returns true will abort the entire traversal. 5669 * 5670 * <p>The default implementation works well for a situation where it is 5671 * used with a container that covers the entire window, allowing it to 5672 * apply the appropriate insets to its content on all edges. If you need 5673 * a more complicated layout (such as two different views fitting system 5674 * windows, one on the top of the window, and one on the bottom), 5675 * you can override the method and handle the insets however you would like. 5676 * Note that the insets provided by the framework are always relative to the 5677 * far edges of the window, not accounting for the location of the called view 5678 * within that window. (In fact when this method is called you do not yet know 5679 * where the layout will place the view, as it is done before layout happens.) 5680 * 5681 * <p>Note: unlike many View methods, there is no dispatch phase to this 5682 * call. If you are overriding it in a ViewGroup and want to allow the 5683 * call to continue to your children, you must be sure to call the super 5684 * implementation. 5685 * 5686 * <p>Here is a sample layout that makes use of fitting system windows 5687 * to have controls for a video view placed inside of the window decorations 5688 * that it hides and shows. This can be used with code like the second 5689 * sample (video player) shown in {@link #setSystemUiVisibility(int)}. 5690 * 5691 * {@sample development/samples/ApiDemos/res/layout/video_player.xml complete} 5692 * 5693 * @param insets Current content insets of the window. Prior to 5694 * {@link android.os.Build.VERSION_CODES#JELLY_BEAN} you must not modify 5695 * the insets or else you and Android will be unhappy. 5696 * 5697 * @return Return true if this view applied the insets and it should not 5698 * continue propagating further down the hierarchy, false otherwise. 5699 * @see #getFitsSystemWindows() 5700 * @see #setFitsSystemWindows(boolean) 5701 * @see #setSystemUiVisibility(int) 5702 */ 5703 protected boolean fitSystemWindows(Rect insets) { 5704 if ((mViewFlags & FITS_SYSTEM_WINDOWS) == FITS_SYSTEM_WINDOWS) { 5705 mUserPaddingStart = UNDEFINED_PADDING; 5706 mUserPaddingEnd = UNDEFINED_PADDING; 5707 Rect localInsets = sThreadLocal.get(); 5708 if (localInsets == null) { 5709 localInsets = new Rect(); 5710 sThreadLocal.set(localInsets); 5711 } 5712 boolean res = computeFitSystemWindows(insets, localInsets); 5713 internalSetPadding(localInsets.left, localInsets.top, 5714 localInsets.right, localInsets.bottom); 5715 return res; 5716 } 5717 return false; 5718 } 5719 5720 /** 5721 * @hide Compute the insets that should be consumed by this view and the ones 5722 * that should propagate to those under it. 5723 */ 5724 protected boolean computeFitSystemWindows(Rect inoutInsets, Rect outLocalInsets) { 5725 if ((mViewFlags & OPTIONAL_FITS_SYSTEM_WINDOWS) == 0 5726 || mAttachInfo == null 5727 || ((mAttachInfo.mSystemUiVisibility & SYSTEM_UI_LAYOUT_FLAGS) == 0 5728 && !mAttachInfo.mOverscanRequested)) { 5729 outLocalInsets.set(inoutInsets); 5730 inoutInsets.set(0, 0, 0, 0); 5731 return true; 5732 } else { 5733 // The application wants to take care of fitting system window for 5734 // the content... however we still need to take care of any overscan here. 5735 final Rect overscan = mAttachInfo.mOverscanInsets; 5736 outLocalInsets.set(overscan); 5737 inoutInsets.left -= overscan.left; 5738 inoutInsets.top -= overscan.top; 5739 inoutInsets.right -= overscan.right; 5740 inoutInsets.bottom -= overscan.bottom; 5741 return false; 5742 } 5743 } 5744 5745 /** 5746 * Sets whether or not this view should account for system screen decorations 5747 * such as the status bar and inset its content; that is, controlling whether 5748 * the default implementation of {@link #fitSystemWindows(Rect)} will be 5749 * executed. See that method for more details. 5750 * 5751 * <p>Note that if you are providing your own implementation of 5752 * {@link #fitSystemWindows(Rect)}, then there is no need to set this 5753 * flag to true -- your implementation will be overriding the default 5754 * implementation that checks this flag. 5755 * 5756 * @param fitSystemWindows If true, then the default implementation of 5757 * {@link #fitSystemWindows(Rect)} will be executed. 5758 * 5759 * @attr ref android.R.styleable#View_fitsSystemWindows 5760 * @see #getFitsSystemWindows() 5761 * @see #fitSystemWindows(Rect) 5762 * @see #setSystemUiVisibility(int) 5763 */ 5764 public void setFitsSystemWindows(boolean fitSystemWindows) { 5765 setFlags(fitSystemWindows ? FITS_SYSTEM_WINDOWS : 0, FITS_SYSTEM_WINDOWS); 5766 } 5767 5768 /** 5769 * Check for state of {@link #setFitsSystemWindows(boolean). If this method 5770 * returns true, the default implementation of {@link #fitSystemWindows(Rect)} 5771 * will be executed. 5772 * 5773 * @return Returns true if the default implementation of 5774 * {@link #fitSystemWindows(Rect)} will be executed. 5775 * 5776 * @attr ref android.R.styleable#View_fitsSystemWindows 5777 * @see #setFitsSystemWindows() 5778 * @see #fitSystemWindows(Rect) 5779 * @see #setSystemUiVisibility(int) 5780 */ 5781 public boolean getFitsSystemWindows() { 5782 return (mViewFlags & FITS_SYSTEM_WINDOWS) == FITS_SYSTEM_WINDOWS; 5783 } 5784 5785 /** @hide */ 5786 public boolean fitsSystemWindows() { 5787 return getFitsSystemWindows(); 5788 } 5789 5790 /** 5791 * Ask that a new dispatch of {@link #fitSystemWindows(Rect)} be performed. 5792 */ 5793 public void requestFitSystemWindows() { 5794 if (mParent != null) { 5795 mParent.requestFitSystemWindows(); 5796 } 5797 } 5798 5799 /** 5800 * For use by PhoneWindow to make its own system window fitting optional. 5801 * @hide 5802 */ 5803 public void makeOptionalFitsSystemWindows() { 5804 setFlags(OPTIONAL_FITS_SYSTEM_WINDOWS, OPTIONAL_FITS_SYSTEM_WINDOWS); 5805 } 5806 5807 /** 5808 * Returns the visibility status for this view. 5809 * 5810 * @return One of {@link #VISIBLE}, {@link #INVISIBLE}, or {@link #GONE}. 5811 * @attr ref android.R.styleable#View_visibility 5812 */ 5813 @ViewDebug.ExportedProperty(mapping = { 5814 @ViewDebug.IntToString(from = VISIBLE, to = "VISIBLE"), 5815 @ViewDebug.IntToString(from = INVISIBLE, to = "INVISIBLE"), 5816 @ViewDebug.IntToString(from = GONE, to = "GONE") 5817 }) 5818 public int getVisibility() { 5819 return mViewFlags & VISIBILITY_MASK; 5820 } 5821 5822 /** 5823 * Set the enabled state of this view. 5824 * 5825 * @param visibility One of {@link #VISIBLE}, {@link #INVISIBLE}, or {@link #GONE}. 5826 * @attr ref android.R.styleable#View_visibility 5827 */ 5828 @RemotableViewMethod 5829 public void setVisibility(int visibility) { 5830 setFlags(visibility, VISIBILITY_MASK); 5831 if (mBackground != null) mBackground.setVisible(visibility == VISIBLE, false); 5832 } 5833 5834 /** 5835 * Returns the enabled status for this view. The interpretation of the 5836 * enabled state varies by subclass. 5837 * 5838 * @return True if this view is enabled, false otherwise. 5839 */ 5840 @ViewDebug.ExportedProperty 5841 public boolean isEnabled() { 5842 return (mViewFlags & ENABLED_MASK) == ENABLED; 5843 } 5844 5845 /** 5846 * Set the enabled state of this view. The interpretation of the enabled 5847 * state varies by subclass. 5848 * 5849 * @param enabled True if this view is enabled, false otherwise. 5850 */ 5851 @RemotableViewMethod 5852 public void setEnabled(boolean enabled) { 5853 if (enabled == isEnabled()) return; 5854 5855 setFlags(enabled ? ENABLED : DISABLED, ENABLED_MASK); 5856 5857 /* 5858 * The View most likely has to change its appearance, so refresh 5859 * the drawable state. 5860 */ 5861 refreshDrawableState(); 5862 5863 // Invalidate too, since the default behavior for views is to be 5864 // be drawn at 50% alpha rather than to change the drawable. 5865 invalidate(true); 5866 } 5867 5868 /** 5869 * Set whether this view can receive the focus. 5870 * 5871 * Setting this to false will also ensure that this view is not focusable 5872 * in touch mode. 5873 * 5874 * @param focusable If true, this view can receive the focus. 5875 * 5876 * @see #setFocusableInTouchMode(boolean) 5877 * @attr ref android.R.styleable#View_focusable 5878 */ 5879 public void setFocusable(boolean focusable) { 5880 if (!focusable) { 5881 setFlags(0, FOCUSABLE_IN_TOUCH_MODE); 5882 } 5883 setFlags(focusable ? FOCUSABLE : NOT_FOCUSABLE, FOCUSABLE_MASK); 5884 } 5885 5886 /** 5887 * Set whether this view can receive focus while in touch mode. 5888 * 5889 * Setting this to true will also ensure that this view is focusable. 5890 * 5891 * @param focusableInTouchMode If true, this view can receive the focus while 5892 * in touch mode. 5893 * 5894 * @see #setFocusable(boolean) 5895 * @attr ref android.R.styleable#View_focusableInTouchMode 5896 */ 5897 public void setFocusableInTouchMode(boolean focusableInTouchMode) { 5898 // Focusable in touch mode should always be set before the focusable flag 5899 // otherwise, setting the focusable flag will trigger a focusableViewAvailable() 5900 // which, in touch mode, will not successfully request focus on this view 5901 // because the focusable in touch mode flag is not set 5902 setFlags(focusableInTouchMode ? FOCUSABLE_IN_TOUCH_MODE : 0, FOCUSABLE_IN_TOUCH_MODE); 5903 if (focusableInTouchMode) { 5904 setFlags(FOCUSABLE, FOCUSABLE_MASK); 5905 } 5906 } 5907 5908 /** 5909 * Set whether this view should have sound effects enabled for events such as 5910 * clicking and touching. 5911 * 5912 * <p>You may wish to disable sound effects for a view if you already play sounds, 5913 * for instance, a dial key that plays dtmf tones. 5914 * 5915 * @param soundEffectsEnabled whether sound effects are enabled for this view. 5916 * @see #isSoundEffectsEnabled() 5917 * @see #playSoundEffect(int) 5918 * @attr ref android.R.styleable#View_soundEffectsEnabled 5919 */ 5920 public void setSoundEffectsEnabled(boolean soundEffectsEnabled) { 5921 setFlags(soundEffectsEnabled ? SOUND_EFFECTS_ENABLED: 0, SOUND_EFFECTS_ENABLED); 5922 } 5923 5924 /** 5925 * @return whether this view should have sound effects enabled for events such as 5926 * clicking and touching. 5927 * 5928 * @see #setSoundEffectsEnabled(boolean) 5929 * @see #playSoundEffect(int) 5930 * @attr ref android.R.styleable#View_soundEffectsEnabled 5931 */ 5932 @ViewDebug.ExportedProperty 5933 public boolean isSoundEffectsEnabled() { 5934 return SOUND_EFFECTS_ENABLED == (mViewFlags & SOUND_EFFECTS_ENABLED); 5935 } 5936 5937 /** 5938 * Set whether this view should have haptic feedback for events such as 5939 * long presses. 5940 * 5941 * <p>You may wish to disable haptic feedback if your view already controls 5942 * its own haptic feedback. 5943 * 5944 * @param hapticFeedbackEnabled whether haptic feedback enabled for this view. 5945 * @see #isHapticFeedbackEnabled() 5946 * @see #performHapticFeedback(int) 5947 * @attr ref android.R.styleable#View_hapticFeedbackEnabled 5948 */ 5949 public void setHapticFeedbackEnabled(boolean hapticFeedbackEnabled) { 5950 setFlags(hapticFeedbackEnabled ? HAPTIC_FEEDBACK_ENABLED: 0, HAPTIC_FEEDBACK_ENABLED); 5951 } 5952 5953 /** 5954 * @return whether this view should have haptic feedback enabled for events 5955 * long presses. 5956 * 5957 * @see #setHapticFeedbackEnabled(boolean) 5958 * @see #performHapticFeedback(int) 5959 * @attr ref android.R.styleable#View_hapticFeedbackEnabled 5960 */ 5961 @ViewDebug.ExportedProperty 5962 public boolean isHapticFeedbackEnabled() { 5963 return HAPTIC_FEEDBACK_ENABLED == (mViewFlags & HAPTIC_FEEDBACK_ENABLED); 5964 } 5965 5966 /** 5967 * Returns the layout direction for this view. 5968 * 5969 * @return One of {@link #LAYOUT_DIRECTION_LTR}, 5970 * {@link #LAYOUT_DIRECTION_RTL}, 5971 * {@link #LAYOUT_DIRECTION_INHERIT} or 5972 * {@link #LAYOUT_DIRECTION_LOCALE}. 5973 * 5974 * @attr ref android.R.styleable#View_layoutDirection 5975 * 5976 * @hide 5977 */ 5978 @ViewDebug.ExportedProperty(category = "layout", mapping = { 5979 @ViewDebug.IntToString(from = LAYOUT_DIRECTION_LTR, to = "LTR"), 5980 @ViewDebug.IntToString(from = LAYOUT_DIRECTION_RTL, to = "RTL"), 5981 @ViewDebug.IntToString(from = LAYOUT_DIRECTION_INHERIT, to = "INHERIT"), 5982 @ViewDebug.IntToString(from = LAYOUT_DIRECTION_LOCALE, to = "LOCALE") 5983 }) 5984 public int getRawLayoutDirection() { 5985 return (mPrivateFlags2 & PFLAG2_LAYOUT_DIRECTION_MASK) >> PFLAG2_LAYOUT_DIRECTION_MASK_SHIFT; 5986 } 5987 5988 /** 5989 * Set the layout direction for this view. This will propagate a reset of layout direction 5990 * resolution to the view's children and resolve layout direction for this view. 5991 * 5992 * @param layoutDirection the layout direction to set. Should be one of: 5993 * 5994 * {@link #LAYOUT_DIRECTION_LTR}, 5995 * {@link #LAYOUT_DIRECTION_RTL}, 5996 * {@link #LAYOUT_DIRECTION_INHERIT}, 5997 * {@link #LAYOUT_DIRECTION_LOCALE}. 5998 * 5999 * Resolution will be done if the value is set to LAYOUT_DIRECTION_INHERIT. The resolution 6000 * proceeds up the parent chain of the view to get the value. If there is no parent, then it 6001 * will return the default {@link #LAYOUT_DIRECTION_LTR}. 6002 * 6003 * @attr ref android.R.styleable#View_layoutDirection 6004 */ 6005 @RemotableViewMethod 6006 public void setLayoutDirection(int layoutDirection) { 6007 if (getRawLayoutDirection() != layoutDirection) { 6008 // Reset the current layout direction and the resolved one 6009 mPrivateFlags2 &= ~PFLAG2_LAYOUT_DIRECTION_MASK; 6010 resetRtlProperties(); 6011 // Set the new layout direction (filtered) 6012 mPrivateFlags2 |= 6013 ((layoutDirection << PFLAG2_LAYOUT_DIRECTION_MASK_SHIFT) & PFLAG2_LAYOUT_DIRECTION_MASK); 6014 // We need to resolve all RTL properties as they all depend on layout direction 6015 resolveRtlPropertiesIfNeeded(); 6016 requestLayout(); 6017 invalidate(true); 6018 } 6019 } 6020 6021 /** 6022 * Returns the resolved layout direction for this view. 6023 * 6024 * @return {@link #LAYOUT_DIRECTION_RTL} if the layout direction is RTL or returns 6025 * {@link #LAYOUT_DIRECTION_LTR} if the layout direction is not RTL. 6026 * 6027 * For compatibility, this will return {@link #LAYOUT_DIRECTION_LTR} if API version 6028 * is lower than {@link android.os.Build.VERSION_CODES#JELLY_BEAN_MR1}. 6029 * 6030 * @attr ref android.R.styleable#View_layoutDirection 6031 */ 6032 @ViewDebug.ExportedProperty(category = "layout", mapping = { 6033 @ViewDebug.IntToString(from = LAYOUT_DIRECTION_LTR, to = "RESOLVED_DIRECTION_LTR"), 6034 @ViewDebug.IntToString(from = LAYOUT_DIRECTION_RTL, to = "RESOLVED_DIRECTION_RTL") 6035 }) 6036 public int getLayoutDirection() { 6037 final int targetSdkVersion = getContext().getApplicationInfo().targetSdkVersion; 6038 if (targetSdkVersion < JELLY_BEAN_MR1) { 6039 mPrivateFlags2 |= PFLAG2_LAYOUT_DIRECTION_RESOLVED; 6040 return LAYOUT_DIRECTION_RESOLVED_DEFAULT; 6041 } 6042 return ((mPrivateFlags2 & PFLAG2_LAYOUT_DIRECTION_RESOLVED_RTL) == 6043 PFLAG2_LAYOUT_DIRECTION_RESOLVED_RTL) ? LAYOUT_DIRECTION_RTL : LAYOUT_DIRECTION_LTR; 6044 } 6045 6046 /** 6047 * Indicates whether or not this view's layout is right-to-left. This is resolved from 6048 * layout attribute and/or the inherited value from the parent 6049 * 6050 * @return true if the layout is right-to-left. 6051 * 6052 * @hide 6053 */ 6054 @ViewDebug.ExportedProperty(category = "layout") 6055 public boolean isLayoutRtl() { 6056 return (getLayoutDirection() == LAYOUT_DIRECTION_RTL); 6057 } 6058 6059 /** 6060 * Indicates whether the view is currently tracking transient state that the 6061 * app should not need to concern itself with saving and restoring, but that 6062 * the framework should take special note to preserve when possible. 6063 * 6064 * <p>A view with transient state cannot be trivially rebound from an external 6065 * data source, such as an adapter binding item views in a list. This may be 6066 * because the view is performing an animation, tracking user selection 6067 * of content, or similar.</p> 6068 * 6069 * @return true if the view has transient state 6070 */ 6071 @ViewDebug.ExportedProperty(category = "layout") 6072 public boolean hasTransientState() { 6073 return (mPrivateFlags2 & PFLAG2_HAS_TRANSIENT_STATE) == PFLAG2_HAS_TRANSIENT_STATE; 6074 } 6075 6076 /** 6077 * Set whether this view is currently tracking transient state that the 6078 * framework should attempt to preserve when possible. This flag is reference counted, 6079 * so every call to setHasTransientState(true) should be paired with a later call 6080 * to setHasTransientState(false). 6081 * 6082 * <p>A view with transient state cannot be trivially rebound from an external 6083 * data source, such as an adapter binding item views in a list. This may be 6084 * because the view is performing an animation, tracking user selection 6085 * of content, or similar.</p> 6086 * 6087 * @param hasTransientState true if this view has transient state 6088 */ 6089 public void setHasTransientState(boolean hasTransientState) { 6090 mTransientStateCount = hasTransientState ? mTransientStateCount + 1 : 6091 mTransientStateCount - 1; 6092 if (mTransientStateCount < 0) { 6093 mTransientStateCount = 0; 6094 Log.e(VIEW_LOG_TAG, "hasTransientState decremented below 0: " + 6095 "unmatched pair of setHasTransientState calls"); 6096 } else if ((hasTransientState && mTransientStateCount == 1) || 6097 (!hasTransientState && mTransientStateCount == 0)) { 6098 // update flag if we've just incremented up from 0 or decremented down to 0 6099 mPrivateFlags2 = (mPrivateFlags2 & ~PFLAG2_HAS_TRANSIENT_STATE) | 6100 (hasTransientState ? PFLAG2_HAS_TRANSIENT_STATE : 0); 6101 if (mParent != null) { 6102 try { 6103 mParent.childHasTransientStateChanged(this, hasTransientState); 6104 } catch (AbstractMethodError e) { 6105 Log.e(VIEW_LOG_TAG, mParent.getClass().getSimpleName() + 6106 " does not fully implement ViewParent", e); 6107 } 6108 } 6109 } 6110 } 6111 6112 /** 6113 * If this view doesn't do any drawing on its own, set this flag to 6114 * allow further optimizations. By default, this flag is not set on 6115 * View, but could be set on some View subclasses such as ViewGroup. 6116 * 6117 * Typically, if you override {@link #onDraw(android.graphics.Canvas)} 6118 * you should clear this flag. 6119 * 6120 * @param willNotDraw whether or not this View draw on its own 6121 */ 6122 public void setWillNotDraw(boolean willNotDraw) { 6123 setFlags(willNotDraw ? WILL_NOT_DRAW : 0, DRAW_MASK); 6124 } 6125 6126 /** 6127 * Returns whether or not this View draws on its own. 6128 * 6129 * @return true if this view has nothing to draw, false otherwise 6130 */ 6131 @ViewDebug.ExportedProperty(category = "drawing") 6132 public boolean willNotDraw() { 6133 return (mViewFlags & DRAW_MASK) == WILL_NOT_DRAW; 6134 } 6135 6136 /** 6137 * When a View's drawing cache is enabled, drawing is redirected to an 6138 * offscreen bitmap. Some views, like an ImageView, must be able to 6139 * bypass this mechanism if they already draw a single bitmap, to avoid 6140 * unnecessary usage of the memory. 6141 * 6142 * @param willNotCacheDrawing true if this view does not cache its 6143 * drawing, false otherwise 6144 */ 6145 public void setWillNotCacheDrawing(boolean willNotCacheDrawing) { 6146 setFlags(willNotCacheDrawing ? WILL_NOT_CACHE_DRAWING : 0, WILL_NOT_CACHE_DRAWING); 6147 } 6148 6149 /** 6150 * Returns whether or not this View can cache its drawing or not. 6151 * 6152 * @return true if this view does not cache its drawing, false otherwise 6153 */ 6154 @ViewDebug.ExportedProperty(category = "drawing") 6155 public boolean willNotCacheDrawing() { 6156 return (mViewFlags & WILL_NOT_CACHE_DRAWING) == WILL_NOT_CACHE_DRAWING; 6157 } 6158 6159 /** 6160 * Indicates whether this view reacts to click events or not. 6161 * 6162 * @return true if the view is clickable, false otherwise 6163 * 6164 * @see #setClickable(boolean) 6165 * @attr ref android.R.styleable#View_clickable 6166 */ 6167 @ViewDebug.ExportedProperty 6168 public boolean isClickable() { 6169 return (mViewFlags & CLICKABLE) == CLICKABLE; 6170 } 6171 6172 /** 6173 * Enables or disables click events for this view. When a view 6174 * is clickable it will change its state to "pressed" on every click. 6175 * Subclasses should set the view clickable to visually react to 6176 * user's clicks. 6177 * 6178 * @param clickable true to make the view clickable, false otherwise 6179 * 6180 * @see #isClickable() 6181 * @attr ref android.R.styleable#View_clickable 6182 */ 6183 public void setClickable(boolean clickable) { 6184 setFlags(clickable ? CLICKABLE : 0, CLICKABLE); 6185 } 6186 6187 /** 6188 * Indicates whether this view reacts to long click events or not. 6189 * 6190 * @return true if the view is long clickable, false otherwise 6191 * 6192 * @see #setLongClickable(boolean) 6193 * @attr ref android.R.styleable#View_longClickable 6194 */ 6195 public boolean isLongClickable() { 6196 return (mViewFlags & LONG_CLICKABLE) == LONG_CLICKABLE; 6197 } 6198 6199 /** 6200 * Enables or disables long click events for this view. When a view is long 6201 * clickable it reacts to the user holding down the button for a longer 6202 * duration than a tap. This event can either launch the listener or a 6203 * context menu. 6204 * 6205 * @param longClickable true to make the view long clickable, false otherwise 6206 * @see #isLongClickable() 6207 * @attr ref android.R.styleable#View_longClickable 6208 */ 6209 public void setLongClickable(boolean longClickable) { 6210 setFlags(longClickable ? LONG_CLICKABLE : 0, LONG_CLICKABLE); 6211 } 6212 6213 /** 6214 * Sets the pressed state for this view. 6215 * 6216 * @see #isClickable() 6217 * @see #setClickable(boolean) 6218 * 6219 * @param pressed Pass true to set the View's internal state to "pressed", or false to reverts 6220 * the View's internal state from a previously set "pressed" state. 6221 */ 6222 public void setPressed(boolean pressed) { 6223 final boolean needsRefresh = pressed != ((mPrivateFlags & PFLAG_PRESSED) == PFLAG_PRESSED); 6224 6225 if (pressed) { 6226 mPrivateFlags |= PFLAG_PRESSED; 6227 } else { 6228 mPrivateFlags &= ~PFLAG_PRESSED; 6229 } 6230 6231 if (needsRefresh) { 6232 refreshDrawableState(); 6233 } 6234 dispatchSetPressed(pressed); 6235 } 6236 6237 /** 6238 * Dispatch setPressed to all of this View's children. 6239 * 6240 * @see #setPressed(boolean) 6241 * 6242 * @param pressed The new pressed state 6243 */ 6244 protected void dispatchSetPressed(boolean pressed) { 6245 } 6246 6247 /** 6248 * Indicates whether the view is currently in pressed state. Unless 6249 * {@link #setPressed(boolean)} is explicitly called, only clickable views can enter 6250 * the pressed state. 6251 * 6252 * @see #setPressed(boolean) 6253 * @see #isClickable() 6254 * @see #setClickable(boolean) 6255 * 6256 * @return true if the view is currently pressed, false otherwise 6257 */ 6258 public boolean isPressed() { 6259 return (mPrivateFlags & PFLAG_PRESSED) == PFLAG_PRESSED; 6260 } 6261 6262 /** 6263 * Indicates whether this view will save its state (that is, 6264 * whether its {@link #onSaveInstanceState} method will be called). 6265 * 6266 * @return Returns true if the view state saving is enabled, else false. 6267 * 6268 * @see #setSaveEnabled(boolean) 6269 * @attr ref android.R.styleable#View_saveEnabled 6270 */ 6271 public boolean isSaveEnabled() { 6272 return (mViewFlags & SAVE_DISABLED_MASK) != SAVE_DISABLED; 6273 } 6274 6275 /** 6276 * Controls whether the saving of this view's state is 6277 * enabled (that is, whether its {@link #onSaveInstanceState} method 6278 * will be called). Note that even if freezing is enabled, the 6279 * view still must have an id assigned to it (via {@link #setId(int)}) 6280 * for its state to be saved. This flag can only disable the 6281 * saving of this view; any child views may still have their state saved. 6282 * 6283 * @param enabled Set to false to <em>disable</em> state saving, or true 6284 * (the default) to allow it. 6285 * 6286 * @see #isSaveEnabled() 6287 * @see #setId(int) 6288 * @see #onSaveInstanceState() 6289 * @attr ref android.R.styleable#View_saveEnabled 6290 */ 6291 public void setSaveEnabled(boolean enabled) { 6292 setFlags(enabled ? 0 : SAVE_DISABLED, SAVE_DISABLED_MASK); 6293 } 6294 6295 /** 6296 * Gets whether the framework should discard touches when the view's 6297 * window is obscured by another visible window. 6298 * Refer to the {@link View} security documentation for more details. 6299 * 6300 * @return True if touch filtering is enabled. 6301 * 6302 * @see #setFilterTouchesWhenObscured(boolean) 6303 * @attr ref android.R.styleable#View_filterTouchesWhenObscured 6304 */ 6305 @ViewDebug.ExportedProperty 6306 public boolean getFilterTouchesWhenObscured() { 6307 return (mViewFlags & FILTER_TOUCHES_WHEN_OBSCURED) != 0; 6308 } 6309 6310 /** 6311 * Sets whether the framework should discard touches when the view's 6312 * window is obscured by another visible window. 6313 * Refer to the {@link View} security documentation for more details. 6314 * 6315 * @param enabled True if touch filtering should be enabled. 6316 * 6317 * @see #getFilterTouchesWhenObscured 6318 * @attr ref android.R.styleable#View_filterTouchesWhenObscured 6319 */ 6320 public void setFilterTouchesWhenObscured(boolean enabled) { 6321 setFlags(enabled ? 0 : FILTER_TOUCHES_WHEN_OBSCURED, 6322 FILTER_TOUCHES_WHEN_OBSCURED); 6323 } 6324 6325 /** 6326 * Indicates whether the entire hierarchy under this view will save its 6327 * state when a state saving traversal occurs from its parent. The default 6328 * is true; if false, these views will not be saved unless 6329 * {@link #saveHierarchyState(SparseArray)} is called directly on this view. 6330 * 6331 * @return Returns true if the view state saving from parent is enabled, else false. 6332 * 6333 * @see #setSaveFromParentEnabled(boolean) 6334 */ 6335 public boolean isSaveFromParentEnabled() { 6336 return (mViewFlags & PARENT_SAVE_DISABLED_MASK) != PARENT_SAVE_DISABLED; 6337 } 6338 6339 /** 6340 * Controls whether the entire hierarchy under this view will save its 6341 * state when a state saving traversal occurs from its parent. The default 6342 * is true; if false, these views will not be saved unless 6343 * {@link #saveHierarchyState(SparseArray)} is called directly on this view. 6344 * 6345 * @param enabled Set to false to <em>disable</em> state saving, or true 6346 * (the default) to allow it. 6347 * 6348 * @see #isSaveFromParentEnabled() 6349 * @see #setId(int) 6350 * @see #onSaveInstanceState() 6351 */ 6352 public void setSaveFromParentEnabled(boolean enabled) { 6353 setFlags(enabled ? 0 : PARENT_SAVE_DISABLED, PARENT_SAVE_DISABLED_MASK); 6354 } 6355 6356 6357 /** 6358 * Returns whether this View is able to take focus. 6359 * 6360 * @return True if this view can take focus, or false otherwise. 6361 * @attr ref android.R.styleable#View_focusable 6362 */ 6363 @ViewDebug.ExportedProperty(category = "focus") 6364 public final boolean isFocusable() { 6365 return FOCUSABLE == (mViewFlags & FOCUSABLE_MASK); 6366 } 6367 6368 /** 6369 * When a view is focusable, it may not want to take focus when in touch mode. 6370 * For example, a button would like focus when the user is navigating via a D-pad 6371 * so that the user can click on it, but once the user starts touching the screen, 6372 * the button shouldn't take focus 6373 * @return Whether the view is focusable in touch mode. 6374 * @attr ref android.R.styleable#View_focusableInTouchMode 6375 */ 6376 @ViewDebug.ExportedProperty 6377 public final boolean isFocusableInTouchMode() { 6378 return FOCUSABLE_IN_TOUCH_MODE == (mViewFlags & FOCUSABLE_IN_TOUCH_MODE); 6379 } 6380 6381 /** 6382 * Find the nearest view in the specified direction that can take focus. 6383 * This does not actually give focus to that view. 6384 * 6385 * @param direction One of FOCUS_UP, FOCUS_DOWN, FOCUS_LEFT, and FOCUS_RIGHT 6386 * 6387 * @return The nearest focusable in the specified direction, or null if none 6388 * can be found. 6389 */ 6390 public View focusSearch(int direction) { 6391 if (mParent != null) { 6392 return mParent.focusSearch(this, direction); 6393 } else { 6394 return null; 6395 } 6396 } 6397 6398 /** 6399 * This method is the last chance for the focused view and its ancestors to 6400 * respond to an arrow key. This is called when the focused view did not 6401 * consume the key internally, nor could the view system find a new view in 6402 * the requested direction to give focus to. 6403 * 6404 * @param focused The currently focused view. 6405 * @param direction The direction focus wants to move. One of FOCUS_UP, 6406 * FOCUS_DOWN, FOCUS_LEFT, and FOCUS_RIGHT. 6407 * @return True if the this view consumed this unhandled move. 6408 */ 6409 public boolean dispatchUnhandledMove(View focused, int direction) { 6410 return false; 6411 } 6412 6413 /** 6414 * If a user manually specified the next view id for a particular direction, 6415 * use the root to look up the view. 6416 * @param root The root view of the hierarchy containing this view. 6417 * @param direction One of FOCUS_UP, FOCUS_DOWN, FOCUS_LEFT, FOCUS_RIGHT, FOCUS_FORWARD, 6418 * or FOCUS_BACKWARD. 6419 * @return The user specified next view, or null if there is none. 6420 */ 6421 View findUserSetNextFocus(View root, int direction) { 6422 switch (direction) { 6423 case FOCUS_LEFT: 6424 if (mNextFocusLeftId == View.NO_ID) return null; 6425 return findViewInsideOutShouldExist(root, mNextFocusLeftId); 6426 case FOCUS_RIGHT: 6427 if (mNextFocusRightId == View.NO_ID) return null; 6428 return findViewInsideOutShouldExist(root, mNextFocusRightId); 6429 case FOCUS_UP: 6430 if (mNextFocusUpId == View.NO_ID) return null; 6431 return findViewInsideOutShouldExist(root, mNextFocusUpId); 6432 case FOCUS_DOWN: 6433 if (mNextFocusDownId == View.NO_ID) return null; 6434 return findViewInsideOutShouldExist(root, mNextFocusDownId); 6435 case FOCUS_FORWARD: 6436 if (mNextFocusForwardId == View.NO_ID) return null; 6437 return findViewInsideOutShouldExist(root, mNextFocusForwardId); 6438 case FOCUS_BACKWARD: { 6439 if (mID == View.NO_ID) return null; 6440 final int id = mID; 6441 return root.findViewByPredicateInsideOut(this, new Predicate<View>() { 6442 @Override 6443 public boolean apply(View t) { 6444 return t.mNextFocusForwardId == id; 6445 } 6446 }); 6447 } 6448 } 6449 return null; 6450 } 6451 6452 private View findViewInsideOutShouldExist(View root, int id) { 6453 if (mMatchIdPredicate == null) { 6454 mMatchIdPredicate = new MatchIdPredicate(); 6455 } 6456 mMatchIdPredicate.mId = id; 6457 View result = root.findViewByPredicateInsideOut(this, mMatchIdPredicate); 6458 if (result == null) { 6459 Log.w(VIEW_LOG_TAG, "couldn't find view with id " + id); 6460 } 6461 return result; 6462 } 6463 6464 /** 6465 * Find and return all focusable views that are descendants of this view, 6466 * possibly including this view if it is focusable itself. 6467 * 6468 * @param direction The direction of the focus 6469 * @return A list of focusable views 6470 */ 6471 public ArrayList<View> getFocusables(int direction) { 6472 ArrayList<View> result = new ArrayList<View>(24); 6473 addFocusables(result, direction); 6474 return result; 6475 } 6476 6477 /** 6478 * Add any focusable views that are descendants of this view (possibly 6479 * including this view if it is focusable itself) to views. If we are in touch mode, 6480 * only add views that are also focusable in touch mode. 6481 * 6482 * @param views Focusable views found so far 6483 * @param direction The direction of the focus 6484 */ 6485 public void addFocusables(ArrayList<View> views, int direction) { 6486 addFocusables(views, direction, FOCUSABLES_TOUCH_MODE); 6487 } 6488 6489 /** 6490 * Adds any focusable views that are descendants of this view (possibly 6491 * including this view if it is focusable itself) to views. This method 6492 * adds all focusable views regardless if we are in touch mode or 6493 * only views focusable in touch mode if we are in touch mode or 6494 * only views that can take accessibility focus if accessibility is enabeld 6495 * depending on the focusable mode paramater. 6496 * 6497 * @param views Focusable views found so far or null if all we are interested is 6498 * the number of focusables. 6499 * @param direction The direction of the focus. 6500 * @param focusableMode The type of focusables to be added. 6501 * 6502 * @see #FOCUSABLES_ALL 6503 * @see #FOCUSABLES_TOUCH_MODE 6504 */ 6505 public void addFocusables(ArrayList<View> views, int direction, int focusableMode) { 6506 if (views == null) { 6507 return; 6508 } 6509 if (!isFocusable()) { 6510 return; 6511 } 6512 if ((focusableMode & FOCUSABLES_TOUCH_MODE) == FOCUSABLES_TOUCH_MODE 6513 && isInTouchMode() && !isFocusableInTouchMode()) { 6514 return; 6515 } 6516 views.add(this); 6517 } 6518 6519 /** 6520 * Finds the Views that contain given text. The containment is case insensitive. 6521 * The search is performed by either the text that the View renders or the content 6522 * description that describes the view for accessibility purposes and the view does 6523 * not render or both. Clients can specify how the search is to be performed via 6524 * passing the {@link #FIND_VIEWS_WITH_TEXT} and 6525 * {@link #FIND_VIEWS_WITH_CONTENT_DESCRIPTION} flags. 6526 * 6527 * @param outViews The output list of matching Views. 6528 * @param searched The text to match against. 6529 * 6530 * @see #FIND_VIEWS_WITH_TEXT 6531 * @see #FIND_VIEWS_WITH_CONTENT_DESCRIPTION 6532 * @see #setContentDescription(CharSequence) 6533 */ 6534 public void findViewsWithText(ArrayList<View> outViews, CharSequence searched, int flags) { 6535 if (getAccessibilityNodeProvider() != null) { 6536 if ((flags & FIND_VIEWS_WITH_ACCESSIBILITY_NODE_PROVIDERS) != 0) { 6537 outViews.add(this); 6538 } 6539 } else if ((flags & FIND_VIEWS_WITH_CONTENT_DESCRIPTION) != 0 6540 && (searched != null && searched.length() > 0) 6541 && (mContentDescription != null && mContentDescription.length() > 0)) { 6542 String searchedLowerCase = searched.toString().toLowerCase(); 6543 String contentDescriptionLowerCase = mContentDescription.toString().toLowerCase(); 6544 if (contentDescriptionLowerCase.contains(searchedLowerCase)) { 6545 outViews.add(this); 6546 } 6547 } 6548 } 6549 6550 /** 6551 * Find and return all touchable views that are descendants of this view, 6552 * possibly including this view if it is touchable itself. 6553 * 6554 * @return A list of touchable views 6555 */ 6556 public ArrayList<View> getTouchables() { 6557 ArrayList<View> result = new ArrayList<View>(); 6558 addTouchables(result); 6559 return result; 6560 } 6561 6562 /** 6563 * Add any touchable views that are descendants of this view (possibly 6564 * including this view if it is touchable itself) to views. 6565 * 6566 * @param views Touchable views found so far 6567 */ 6568 public void addTouchables(ArrayList<View> views) { 6569 final int viewFlags = mViewFlags; 6570 6571 if (((viewFlags & CLICKABLE) == CLICKABLE || (viewFlags & LONG_CLICKABLE) == LONG_CLICKABLE) 6572 && (viewFlags & ENABLED_MASK) == ENABLED) { 6573 views.add(this); 6574 } 6575 } 6576 6577 /** 6578 * Returns whether this View is accessibility focused. 6579 * 6580 * @return True if this View is accessibility focused. 6581 */ 6582 boolean isAccessibilityFocused() { 6583 return (mPrivateFlags2 & PFLAG2_ACCESSIBILITY_FOCUSED) != 0; 6584 } 6585 6586 /** 6587 * Call this to try to give accessibility focus to this view. 6588 * 6589 * A view will not actually take focus if {@link AccessibilityManager#isEnabled()} 6590 * returns false or the view is no visible or the view already has accessibility 6591 * focus. 6592 * 6593 * See also {@link #focusSearch(int)}, which is what you call to say that you 6594 * have focus, and you want your parent to look for the next one. 6595 * 6596 * @return Whether this view actually took accessibility focus. 6597 * 6598 * @hide 6599 */ 6600 public boolean requestAccessibilityFocus() { 6601 AccessibilityManager manager = AccessibilityManager.getInstance(mContext); 6602 if (!manager.isEnabled() || !manager.isTouchExplorationEnabled()) { 6603 return false; 6604 } 6605 if ((mViewFlags & VISIBILITY_MASK) != VISIBLE) { 6606 return false; 6607 } 6608 if ((mPrivateFlags2 & PFLAG2_ACCESSIBILITY_FOCUSED) == 0) { 6609 mPrivateFlags2 |= PFLAG2_ACCESSIBILITY_FOCUSED; 6610 ViewRootImpl viewRootImpl = getViewRootImpl(); 6611 if (viewRootImpl != null) { 6612 viewRootImpl.setAccessibilityFocus(this, null); 6613 } 6614 invalidate(); 6615 sendAccessibilityEvent(AccessibilityEvent.TYPE_VIEW_ACCESSIBILITY_FOCUSED); 6616 notifyAccessibilityStateChanged(); 6617 return true; 6618 } 6619 return false; 6620 } 6621 6622 /** 6623 * Call this to try to clear accessibility focus of this view. 6624 * 6625 * See also {@link #focusSearch(int)}, which is what you call to say that you 6626 * have focus, and you want your parent to look for the next one. 6627 * 6628 * @hide 6629 */ 6630 public void clearAccessibilityFocus() { 6631 clearAccessibilityFocusNoCallbacks(); 6632 // Clear the global reference of accessibility focus if this 6633 // view or any of its descendants had accessibility focus. 6634 ViewRootImpl viewRootImpl = getViewRootImpl(); 6635 if (viewRootImpl != null) { 6636 View focusHost = viewRootImpl.getAccessibilityFocusedHost(); 6637 if (focusHost != null && ViewRootImpl.isViewDescendantOf(focusHost, this)) { 6638 viewRootImpl.setAccessibilityFocus(null, null); 6639 } 6640 } 6641 } 6642 6643 private void sendAccessibilityHoverEvent(int eventType) { 6644 // Since we are not delivering to a client accessibility events from not 6645 // important views (unless the clinet request that) we need to fire the 6646 // event from the deepest view exposed to the client. As a consequence if 6647 // the user crosses a not exposed view the client will see enter and exit 6648 // of the exposed predecessor followed by and enter and exit of that same 6649 // predecessor when entering and exiting the not exposed descendant. This 6650 // is fine since the client has a clear idea which view is hovered at the 6651 // price of a couple more events being sent. This is a simple and 6652 // working solution. 6653 View source = this; 6654 while (true) { 6655 if (source.includeForAccessibility()) { 6656 source.sendAccessibilityEvent(eventType); 6657 return; 6658 } 6659 ViewParent parent = source.getParent(); 6660 if (parent instanceof View) { 6661 source = (View) parent; 6662 } else { 6663 return; 6664 } 6665 } 6666 } 6667 6668 /** 6669 * Clears accessibility focus without calling any callback methods 6670 * normally invoked in {@link #clearAccessibilityFocus()}. This method 6671 * is used for clearing accessibility focus when giving this focus to 6672 * another view. 6673 */ 6674 void clearAccessibilityFocusNoCallbacks() { 6675 if ((mPrivateFlags2 & PFLAG2_ACCESSIBILITY_FOCUSED) != 0) { 6676 mPrivateFlags2 &= ~PFLAG2_ACCESSIBILITY_FOCUSED; 6677 invalidate(); 6678 sendAccessibilityEvent(AccessibilityEvent.TYPE_VIEW_ACCESSIBILITY_FOCUS_CLEARED); 6679 notifyAccessibilityStateChanged(); 6680 } 6681 } 6682 6683 /** 6684 * Call this to try to give focus to a specific view or to one of its 6685 * descendants. 6686 * 6687 * A view will not actually take focus if it is not focusable ({@link #isFocusable} returns 6688 * false), or if it is focusable and it is not focusable in touch mode 6689 * ({@link #isFocusableInTouchMode}) while the device is in touch mode. 6690 * 6691 * See also {@link #focusSearch(int)}, which is what you call to say that you 6692 * have focus, and you want your parent to look for the next one. 6693 * 6694 * This is equivalent to calling {@link #requestFocus(int, Rect)} with arguments 6695 * {@link #FOCUS_DOWN} and <code>null</code>. 6696 * 6697 * @return Whether this view or one of its descendants actually took focus. 6698 */ 6699 public final boolean requestFocus() { 6700 return requestFocus(View.FOCUS_DOWN); 6701 } 6702 6703 /** 6704 * Call this to try to give focus to a specific view or to one of its 6705 * descendants and give it a hint about what direction focus is heading. 6706 * 6707 * A view will not actually take focus if it is not focusable ({@link #isFocusable} returns 6708 * false), or if it is focusable and it is not focusable in touch mode 6709 * ({@link #isFocusableInTouchMode}) while the device is in touch mode. 6710 * 6711 * See also {@link #focusSearch(int)}, which is what you call to say that you 6712 * have focus, and you want your parent to look for the next one. 6713 * 6714 * This is equivalent to calling {@link #requestFocus(int, Rect)} with 6715 * <code>null</code> set for the previously focused rectangle. 6716 * 6717 * @param direction One of FOCUS_UP, FOCUS_DOWN, FOCUS_LEFT, and FOCUS_RIGHT 6718 * @return Whether this view or one of its descendants actually took focus. 6719 */ 6720 public final boolean requestFocus(int direction) { 6721 return requestFocus(direction, null); 6722 } 6723 6724 /** 6725 * Call this to try to give focus to a specific view or to one of its descendants 6726 * and give it hints about the direction and a specific rectangle that the focus 6727 * is coming from. The rectangle can help give larger views a finer grained hint 6728 * about where focus is coming from, and therefore, where to show selection, or 6729 * forward focus change internally. 6730 * 6731 * A view will not actually take focus if it is not focusable ({@link #isFocusable} returns 6732 * false), or if it is focusable and it is not focusable in touch mode 6733 * ({@link #isFocusableInTouchMode}) while the device is in touch mode. 6734 * 6735 * A View will not take focus if it is not visible. 6736 * 6737 * A View will not take focus if one of its parents has 6738 * {@link android.view.ViewGroup#getDescendantFocusability()} equal to 6739 * {@link ViewGroup#FOCUS_BLOCK_DESCENDANTS}. 6740 * 6741 * See also {@link #focusSearch(int)}, which is what you call to say that you 6742 * have focus, and you want your parent to look for the next one. 6743 * 6744 * You may wish to override this method if your custom {@link View} has an internal 6745 * {@link View} that it wishes to forward the request to. 6746 * 6747 * @param direction One of FOCUS_UP, FOCUS_DOWN, FOCUS_LEFT, and FOCUS_RIGHT 6748 * @param previouslyFocusedRect The rectangle (in this View's coordinate system) 6749 * to give a finer grained hint about where focus is coming from. May be null 6750 * if there is no hint. 6751 * @return Whether this view or one of its descendants actually took focus. 6752 */ 6753 public boolean requestFocus(int direction, Rect previouslyFocusedRect) { 6754 return requestFocusNoSearch(direction, previouslyFocusedRect); 6755 } 6756 6757 private boolean requestFocusNoSearch(int direction, Rect previouslyFocusedRect) { 6758 // need to be focusable 6759 if ((mViewFlags & FOCUSABLE_MASK) != FOCUSABLE || 6760 (mViewFlags & VISIBILITY_MASK) != VISIBLE) { 6761 return false; 6762 } 6763 6764 // need to be focusable in touch mode if in touch mode 6765 if (isInTouchMode() && 6766 (FOCUSABLE_IN_TOUCH_MODE != (mViewFlags & FOCUSABLE_IN_TOUCH_MODE))) { 6767 return false; 6768 } 6769 6770 // need to not have any parents blocking us 6771 if (hasAncestorThatBlocksDescendantFocus()) { 6772 return false; 6773 } 6774 6775 handleFocusGainInternal(direction, previouslyFocusedRect); 6776 return true; 6777 } 6778 6779 /** 6780 * Call this to try to give focus to a specific view or to one of its descendants. This is a 6781 * special variant of {@link #requestFocus() } that will allow views that are not focuable in 6782 * touch mode to request focus when they are touched. 6783 * 6784 * @return Whether this view or one of its descendants actually took focus. 6785 * 6786 * @see #isInTouchMode() 6787 * 6788 */ 6789 public final boolean requestFocusFromTouch() { 6790 // Leave touch mode if we need to 6791 if (isInTouchMode()) { 6792 ViewRootImpl viewRoot = getViewRootImpl(); 6793 if (viewRoot != null) { 6794 viewRoot.ensureTouchMode(false); 6795 } 6796 } 6797 return requestFocus(View.FOCUS_DOWN); 6798 } 6799 6800 /** 6801 * @return Whether any ancestor of this view blocks descendant focus. 6802 */ 6803 private boolean hasAncestorThatBlocksDescendantFocus() { 6804 ViewParent ancestor = mParent; 6805 while (ancestor instanceof ViewGroup) { 6806 final ViewGroup vgAncestor = (ViewGroup) ancestor; 6807 if (vgAncestor.getDescendantFocusability() == ViewGroup.FOCUS_BLOCK_DESCENDANTS) { 6808 return true; 6809 } else { 6810 ancestor = vgAncestor.getParent(); 6811 } 6812 } 6813 return false; 6814 } 6815 6816 /** 6817 * Gets the mode for determining whether this View is important for accessibility 6818 * which is if it fires accessibility events and if it is reported to 6819 * accessibility services that query the screen. 6820 * 6821 * @return The mode for determining whether a View is important for accessibility. 6822 * 6823 * @attr ref android.R.styleable#View_importantForAccessibility 6824 * 6825 * @see #IMPORTANT_FOR_ACCESSIBILITY_YES 6826 * @see #IMPORTANT_FOR_ACCESSIBILITY_NO 6827 * @see #IMPORTANT_FOR_ACCESSIBILITY_AUTO 6828 */ 6829 @ViewDebug.ExportedProperty(category = "accessibility", mapping = { 6830 @ViewDebug.IntToString(from = IMPORTANT_FOR_ACCESSIBILITY_AUTO, to = "auto"), 6831 @ViewDebug.IntToString(from = IMPORTANT_FOR_ACCESSIBILITY_YES, to = "yes"), 6832 @ViewDebug.IntToString(from = IMPORTANT_FOR_ACCESSIBILITY_NO, to = "no") 6833 }) 6834 public int getImportantForAccessibility() { 6835 return (mPrivateFlags2 & PFLAG2_IMPORTANT_FOR_ACCESSIBILITY_MASK) 6836 >> PFLAG2_IMPORTANT_FOR_ACCESSIBILITY_SHIFT; 6837 } 6838 6839 /** 6840 * Sets how to determine whether this view is important for accessibility 6841 * which is if it fires accessibility events and if it is reported to 6842 * accessibility services that query the screen. 6843 * 6844 * @param mode How to determine whether this view is important for accessibility. 6845 * 6846 * @attr ref android.R.styleable#View_importantForAccessibility 6847 * 6848 * @see #IMPORTANT_FOR_ACCESSIBILITY_YES 6849 * @see #IMPORTANT_FOR_ACCESSIBILITY_NO 6850 * @see #IMPORTANT_FOR_ACCESSIBILITY_AUTO 6851 */ 6852 public void setImportantForAccessibility(int mode) { 6853 if (mode != getImportantForAccessibility()) { 6854 mPrivateFlags2 &= ~PFLAG2_IMPORTANT_FOR_ACCESSIBILITY_MASK; 6855 mPrivateFlags2 |= (mode << PFLAG2_IMPORTANT_FOR_ACCESSIBILITY_SHIFT) 6856 & PFLAG2_IMPORTANT_FOR_ACCESSIBILITY_MASK; 6857 notifyAccessibilityStateChanged(); 6858 } 6859 } 6860 6861 /** 6862 * Gets whether this view should be exposed for accessibility. 6863 * 6864 * @return Whether the view is exposed for accessibility. 6865 * 6866 * @hide 6867 */ 6868 public boolean isImportantForAccessibility() { 6869 final int mode = (mPrivateFlags2 & PFLAG2_IMPORTANT_FOR_ACCESSIBILITY_MASK) 6870 >> PFLAG2_IMPORTANT_FOR_ACCESSIBILITY_SHIFT; 6871 switch (mode) { 6872 case IMPORTANT_FOR_ACCESSIBILITY_YES: 6873 return true; 6874 case IMPORTANT_FOR_ACCESSIBILITY_NO: 6875 return false; 6876 case IMPORTANT_FOR_ACCESSIBILITY_AUTO: 6877 return isActionableForAccessibility() || hasListenersForAccessibility() 6878 || getAccessibilityNodeProvider() != null; 6879 default: 6880 throw new IllegalArgumentException("Unknow important for accessibility mode: " 6881 + mode); 6882 } 6883 } 6884 6885 /** 6886 * Gets the parent for accessibility purposes. Note that the parent for 6887 * accessibility is not necessary the immediate parent. It is the first 6888 * predecessor that is important for accessibility. 6889 * 6890 * @return The parent for accessibility purposes. 6891 */ 6892 public ViewParent getParentForAccessibility() { 6893 if (mParent instanceof View) { 6894 View parentView = (View) mParent; 6895 if (parentView.includeForAccessibility()) { 6896 return mParent; 6897 } else { 6898 return mParent.getParentForAccessibility(); 6899 } 6900 } 6901 return null; 6902 } 6903 6904 /** 6905 * Adds the children of a given View for accessibility. Since some Views are 6906 * not important for accessibility the children for accessibility are not 6907 * necessarily direct children of the view, rather they are the first level of 6908 * descendants important for accessibility. 6909 * 6910 * @param children The list of children for accessibility. 6911 */ 6912 public void addChildrenForAccessibility(ArrayList<View> children) { 6913 if (includeForAccessibility()) { 6914 children.add(this); 6915 } 6916 } 6917 6918 /** 6919 * Whether to regard this view for accessibility. A view is regarded for 6920 * accessibility if it is important for accessibility or the querying 6921 * accessibility service has explicitly requested that view not 6922 * important for accessibility are regarded. 6923 * 6924 * @return Whether to regard the view for accessibility. 6925 * 6926 * @hide 6927 */ 6928 public boolean includeForAccessibility() { 6929 if (mAttachInfo != null) { 6930 return (mAttachInfo.mAccessibilityFetchFlags 6931 & AccessibilityNodeInfo.FLAG_INCLUDE_NOT_IMPORTANT_VIEWS) != 0 6932 || isImportantForAccessibility(); 6933 } 6934 return false; 6935 } 6936 6937 /** 6938 * Returns whether the View is considered actionable from 6939 * accessibility perspective. Such view are important for 6940 * accessibility. 6941 * 6942 * @return True if the view is actionable for accessibility. 6943 * 6944 * @hide 6945 */ 6946 public boolean isActionableForAccessibility() { 6947 return (isClickable() || isLongClickable() || isFocusable()); 6948 } 6949 6950 /** 6951 * Returns whether the View has registered callbacks wich makes it 6952 * important for accessibility. 6953 * 6954 * @return True if the view is actionable for accessibility. 6955 */ 6956 private boolean hasListenersForAccessibility() { 6957 ListenerInfo info = getListenerInfo(); 6958 return mTouchDelegate != null || info.mOnKeyListener != null 6959 || info.mOnTouchListener != null || info.mOnGenericMotionListener != null 6960 || info.mOnHoverListener != null || info.mOnDragListener != null; 6961 } 6962 6963 /** 6964 * Notifies accessibility services that some view's important for 6965 * accessibility state has changed. Note that such notifications 6966 * are made at most once every 6967 * {@link ViewConfiguration#getSendRecurringAccessibilityEventsInterval()} 6968 * to avoid unnecessary load to the system. Also once a view has 6969 * made a notifucation this method is a NOP until the notification has 6970 * been sent to clients. 6971 * 6972 * @hide 6973 * 6974 * TODO: Makse sure this method is called for any view state change 6975 * that is interesting for accessilility purposes. 6976 */ 6977 public void notifyAccessibilityStateChanged() { 6978 if (!AccessibilityManager.getInstance(mContext).isEnabled()) { 6979 return; 6980 } 6981 if ((mPrivateFlags2 & PFLAG2_ACCESSIBILITY_STATE_CHANGED) == 0) { 6982 mPrivateFlags2 |= PFLAG2_ACCESSIBILITY_STATE_CHANGED; 6983 if (mParent != null) { 6984 mParent.childAccessibilityStateChanged(this); 6985 } 6986 } 6987 } 6988 6989 /** 6990 * Reset the state indicating the this view has requested clients 6991 * interested in its accessibility state to be notified. 6992 * 6993 * @hide 6994 */ 6995 public void resetAccessibilityStateChanged() { 6996 mPrivateFlags2 &= ~PFLAG2_ACCESSIBILITY_STATE_CHANGED; 6997 } 6998 6999 /** 7000 * Performs the specified accessibility action on the view. For 7001 * possible accessibility actions look at {@link AccessibilityNodeInfo}. 7002 * <p> 7003 * If an {@link AccessibilityDelegate} has been specified via calling 7004 * {@link #setAccessibilityDelegate(AccessibilityDelegate)} its 7005 * {@link AccessibilityDelegate#performAccessibilityAction(View, int, Bundle)} 7006 * is responsible for handling this call. 7007 * </p> 7008 * 7009 * @param action The action to perform. 7010 * @param arguments Optional action arguments. 7011 * @return Whether the action was performed. 7012 */ 7013 public boolean performAccessibilityAction(int action, Bundle arguments) { 7014 if (mAccessibilityDelegate != null) { 7015 return mAccessibilityDelegate.performAccessibilityAction(this, action, arguments); 7016 } else { 7017 return performAccessibilityActionInternal(action, arguments); 7018 } 7019 } 7020 7021 /** 7022 * @see #performAccessibilityAction(int, Bundle) 7023 * 7024 * Note: Called from the default {@link AccessibilityDelegate}. 7025 */ 7026 boolean performAccessibilityActionInternal(int action, Bundle arguments) { 7027 switch (action) { 7028 case AccessibilityNodeInfo.ACTION_CLICK: { 7029 if (isClickable()) { 7030 performClick(); 7031 return true; 7032 } 7033 } break; 7034 case AccessibilityNodeInfo.ACTION_LONG_CLICK: { 7035 if (isLongClickable()) { 7036 performLongClick(); 7037 return true; 7038 } 7039 } break; 7040 case AccessibilityNodeInfo.ACTION_FOCUS: { 7041 if (!hasFocus()) { 7042 // Get out of touch mode since accessibility 7043 // wants to move focus around. 7044 getViewRootImpl().ensureTouchMode(false); 7045 return requestFocus(); 7046 } 7047 } break; 7048 case AccessibilityNodeInfo.ACTION_CLEAR_FOCUS: { 7049 if (hasFocus()) { 7050 clearFocus(); 7051 return !isFocused(); 7052 } 7053 } break; 7054 case AccessibilityNodeInfo.ACTION_SELECT: { 7055 if (!isSelected()) { 7056 setSelected(true); 7057 return isSelected(); 7058 } 7059 } break; 7060 case AccessibilityNodeInfo.ACTION_CLEAR_SELECTION: { 7061 if (isSelected()) { 7062 setSelected(false); 7063 return !isSelected(); 7064 } 7065 } break; 7066 case AccessibilityNodeInfo.ACTION_ACCESSIBILITY_FOCUS: { 7067 if (!isAccessibilityFocused()) { 7068 return requestAccessibilityFocus(); 7069 } 7070 } break; 7071 case AccessibilityNodeInfo.ACTION_CLEAR_ACCESSIBILITY_FOCUS: { 7072 if (isAccessibilityFocused()) { 7073 clearAccessibilityFocus(); 7074 return true; 7075 } 7076 } break; 7077 case AccessibilityNodeInfo.ACTION_NEXT_AT_MOVEMENT_GRANULARITY: { 7078 if (arguments != null) { 7079 final int granularity = arguments.getInt( 7080 AccessibilityNodeInfo.ACTION_ARGUMENT_MOVEMENT_GRANULARITY_INT); 7081 final boolean extendSelection = arguments.getBoolean( 7082 AccessibilityNodeInfo.ACTION_ARGUMENT_EXTEND_SELECTION_BOOLEAN); 7083 return traverseAtGranularity(granularity, true, extendSelection); 7084 } 7085 } break; 7086 case AccessibilityNodeInfo.ACTION_PREVIOUS_AT_MOVEMENT_GRANULARITY: { 7087 if (arguments != null) { 7088 final int granularity = arguments.getInt( 7089 AccessibilityNodeInfo.ACTION_ARGUMENT_MOVEMENT_GRANULARITY_INT); 7090 final boolean extendSelection = arguments.getBoolean( 7091 AccessibilityNodeInfo.ACTION_ARGUMENT_EXTEND_SELECTION_BOOLEAN); 7092 return traverseAtGranularity(granularity, false, extendSelection); 7093 } 7094 } break; 7095 case AccessibilityNodeInfo.ACTION_SET_SELECTION: { 7096 CharSequence text = getIterableTextForAccessibility(); 7097 if (text == null) { 7098 return false; 7099 } 7100 final int start = (arguments != null) ? arguments.getInt( 7101 AccessibilityNodeInfo.ACTION_ARGUMENT_SELECTION_START_INT, -1) : -1; 7102 final int end = (arguments != null) ? arguments.getInt( 7103 AccessibilityNodeInfo.ACTION_ARGUMENT_SELECTION_END_INT, -1) : -1; 7104 // Only cursor position can be specified (selection length == 0) 7105 if ((getAccessibilitySelectionStart() != start 7106 || getAccessibilitySelectionEnd() != end) 7107 && (start == end)) { 7108 setAccessibilitySelection(start, end); 7109 notifyAccessibilityStateChanged(); 7110 return true; 7111 } 7112 } break; 7113 } 7114 return false; 7115 } 7116 7117 private boolean traverseAtGranularity(int granularity, boolean forward, 7118 boolean extendSelection) { 7119 CharSequence text = getIterableTextForAccessibility(); 7120 if (text == null || text.length() == 0) { 7121 return false; 7122 } 7123 TextSegmentIterator iterator = getIteratorForGranularity(granularity); 7124 if (iterator == null) { 7125 return false; 7126 } 7127 int current = getAccessibilitySelectionEnd(); 7128 if (current == ACCESSIBILITY_CURSOR_POSITION_UNDEFINED) { 7129 current = forward ? 0 : text.length(); 7130 } 7131 final int[] range = forward ? iterator.following(current) : iterator.preceding(current); 7132 if (range == null) { 7133 return false; 7134 } 7135 final int segmentStart = range[0]; 7136 final int segmentEnd = range[1]; 7137 int selectionStart; 7138 int selectionEnd; 7139 if (extendSelection && isAccessibilitySelectionExtendable()) { 7140 selectionStart = getAccessibilitySelectionStart(); 7141 if (selectionStart == ACCESSIBILITY_CURSOR_POSITION_UNDEFINED) { 7142 selectionStart = forward ? segmentStart : segmentEnd; 7143 } 7144 selectionEnd = forward ? segmentEnd : segmentStart; 7145 } else { 7146 selectionStart = selectionEnd= forward ? segmentEnd : segmentStart; 7147 } 7148 setAccessibilitySelection(selectionStart, selectionEnd); 7149 final int action = forward ? AccessibilityNodeInfo.ACTION_NEXT_AT_MOVEMENT_GRANULARITY 7150 : AccessibilityNodeInfo.ACTION_PREVIOUS_AT_MOVEMENT_GRANULARITY; 7151 sendViewTextTraversedAtGranularityEvent(action, granularity, segmentStart, segmentEnd); 7152 return true; 7153 } 7154 7155 /** 7156 * Gets the text reported for accessibility purposes. 7157 * 7158 * @return The accessibility text. 7159 * 7160 * @hide 7161 */ 7162 public CharSequence getIterableTextForAccessibility() { 7163 return getContentDescription(); 7164 } 7165 7166 /** 7167 * Gets whether accessibility selection can be extended. 7168 * 7169 * @return If selection is extensible. 7170 * 7171 * @hide 7172 */ 7173 public boolean isAccessibilitySelectionExtendable() { 7174 return false; 7175 } 7176 7177 /** 7178 * @hide 7179 */ 7180 public int getAccessibilitySelectionStart() { 7181 return mAccessibilityCursorPosition; 7182 } 7183 7184 /** 7185 * @hide 7186 */ 7187 public int getAccessibilitySelectionEnd() { 7188 return getAccessibilitySelectionStart(); 7189 } 7190 7191 /** 7192 * @hide 7193 */ 7194 public void setAccessibilitySelection(int start, int end) { 7195 if (start == end && end == mAccessibilityCursorPosition) { 7196 return; 7197 } 7198 if (start >= 0 && start == end && end <= getIterableTextForAccessibility().length()) { 7199 mAccessibilityCursorPosition = start; 7200 } else { 7201 mAccessibilityCursorPosition = ACCESSIBILITY_CURSOR_POSITION_UNDEFINED; 7202 } 7203 sendAccessibilityEvent(AccessibilityEvent.TYPE_VIEW_TEXT_SELECTION_CHANGED); 7204 } 7205 7206 private void sendViewTextTraversedAtGranularityEvent(int action, int granularity, 7207 int fromIndex, int toIndex) { 7208 if (mParent == null) { 7209 return; 7210 } 7211 AccessibilityEvent event = AccessibilityEvent.obtain( 7212 AccessibilityEvent.TYPE_VIEW_TEXT_TRAVERSED_AT_MOVEMENT_GRANULARITY); 7213 onInitializeAccessibilityEvent(event); 7214 onPopulateAccessibilityEvent(event); 7215 event.setFromIndex(fromIndex); 7216 event.setToIndex(toIndex); 7217 event.setAction(action); 7218 event.setMovementGranularity(granularity); 7219 mParent.requestSendAccessibilityEvent(this, event); 7220 } 7221 7222 /** 7223 * @hide 7224 */ 7225 public TextSegmentIterator getIteratorForGranularity(int granularity) { 7226 switch (granularity) { 7227 case AccessibilityNodeInfo.MOVEMENT_GRANULARITY_CHARACTER: { 7228 CharSequence text = getIterableTextForAccessibility(); 7229 if (text != null && text.length() > 0) { 7230 CharacterTextSegmentIterator iterator = 7231 CharacterTextSegmentIterator.getInstance( 7232 mContext.getResources().getConfiguration().locale); 7233 iterator.initialize(text.toString()); 7234 return iterator; 7235 } 7236 } break; 7237 case AccessibilityNodeInfo.MOVEMENT_GRANULARITY_WORD: { 7238 CharSequence text = getIterableTextForAccessibility(); 7239 if (text != null && text.length() > 0) { 7240 WordTextSegmentIterator iterator = 7241 WordTextSegmentIterator.getInstance( 7242 mContext.getResources().getConfiguration().locale); 7243 iterator.initialize(text.toString()); 7244 return iterator; 7245 } 7246 } break; 7247 case AccessibilityNodeInfo.MOVEMENT_GRANULARITY_PARAGRAPH: { 7248 CharSequence text = getIterableTextForAccessibility(); 7249 if (text != null && text.length() > 0) { 7250 ParagraphTextSegmentIterator iterator = 7251 ParagraphTextSegmentIterator.getInstance(); 7252 iterator.initialize(text.toString()); 7253 return iterator; 7254 } 7255 } break; 7256 } 7257 return null; 7258 } 7259 7260 /** 7261 * @hide 7262 */ 7263 public void dispatchStartTemporaryDetach() { 7264 clearAccessibilityFocus(); 7265 clearDisplayList(); 7266 7267 onStartTemporaryDetach(); 7268 } 7269 7270 /** 7271 * This is called when a container is going to temporarily detach a child, with 7272 * {@link ViewGroup#detachViewFromParent(View) ViewGroup.detachViewFromParent}. 7273 * It will either be followed by {@link #onFinishTemporaryDetach()} or 7274 * {@link #onDetachedFromWindow()} when the container is done. 7275 */ 7276 public void onStartTemporaryDetach() { 7277 removeUnsetPressCallback(); 7278 mPrivateFlags |= PFLAG_CANCEL_NEXT_UP_EVENT; 7279 } 7280 7281 /** 7282 * @hide 7283 */ 7284 public void dispatchFinishTemporaryDetach() { 7285 onFinishTemporaryDetach(); 7286 } 7287 7288 /** 7289 * Called after {@link #onStartTemporaryDetach} when the container is done 7290 * changing the view. 7291 */ 7292 public void onFinishTemporaryDetach() { 7293 } 7294 7295 /** 7296 * Return the global {@link KeyEvent.DispatcherState KeyEvent.DispatcherState} 7297 * for this view's window. Returns null if the view is not currently attached 7298 * to the window. Normally you will not need to use this directly, but 7299 * just use the standard high-level event callbacks like 7300 * {@link #onKeyDown(int, KeyEvent)}. 7301 */ 7302 public KeyEvent.DispatcherState getKeyDispatcherState() { 7303 return mAttachInfo != null ? mAttachInfo.mKeyDispatchState : null; 7304 } 7305 7306 /** 7307 * Dispatch a key event before it is processed by any input method 7308 * associated with the view hierarchy. This can be used to intercept 7309 * key events in special situations before the IME consumes them; a 7310 * typical example would be handling the BACK key to update the application's 7311 * UI instead of allowing the IME to see it and close itself. 7312 * 7313 * @param event The key event to be dispatched. 7314 * @return True if the event was handled, false otherwise. 7315 */ 7316 public boolean dispatchKeyEventPreIme(KeyEvent event) { 7317 return onKeyPreIme(event.getKeyCode(), event); 7318 } 7319 7320 /** 7321 * Dispatch a key event to the next view on the focus path. This path runs 7322 * from the top of the view tree down to the currently focused view. If this 7323 * view has focus, it will dispatch to itself. Otherwise it will dispatch 7324 * the next node down the focus path. This method also fires any key 7325 * listeners. 7326 * 7327 * @param event The key event to be dispatched. 7328 * @return True if the event was handled, false otherwise. 7329 */ 7330 public boolean dispatchKeyEvent(KeyEvent event) { 7331 if (mInputEventConsistencyVerifier != null) { 7332 mInputEventConsistencyVerifier.onKeyEvent(event, 0); 7333 } 7334 7335 // Give any attached key listener a first crack at the event. 7336 //noinspection SimplifiableIfStatement 7337 ListenerInfo li = mListenerInfo; 7338 if (li != null && li.mOnKeyListener != null && (mViewFlags & ENABLED_MASK) == ENABLED 7339 && li.mOnKeyListener.onKey(this, event.getKeyCode(), event)) { 7340 return true; 7341 } 7342 7343 if (event.dispatch(this, mAttachInfo != null 7344 ? mAttachInfo.mKeyDispatchState : null, this)) { 7345 return true; 7346 } 7347 7348 if (mInputEventConsistencyVerifier != null) { 7349 mInputEventConsistencyVerifier.onUnhandledEvent(event, 0); 7350 } 7351 return false; 7352 } 7353 7354 /** 7355 * Dispatches a key shortcut event. 7356 * 7357 * @param event The key event to be dispatched. 7358 * @return True if the event was handled by the view, false otherwise. 7359 */ 7360 public boolean dispatchKeyShortcutEvent(KeyEvent event) { 7361 return onKeyShortcut(event.getKeyCode(), event); 7362 } 7363 7364 /** 7365 * Pass the touch screen motion event down to the target view, or this 7366 * view if it is the target. 7367 * 7368 * @param event The motion event to be dispatched. 7369 * @return True if the event was handled by the view, false otherwise. 7370 */ 7371 public boolean dispatchTouchEvent(MotionEvent event) { 7372 if (mInputEventConsistencyVerifier != null) { 7373 mInputEventConsistencyVerifier.onTouchEvent(event, 0); 7374 } 7375 7376 if (onFilterTouchEventForSecurity(event)) { 7377 //noinspection SimplifiableIfStatement 7378 ListenerInfo li = mListenerInfo; 7379 if (li != null && li.mOnTouchListener != null && (mViewFlags & ENABLED_MASK) == ENABLED 7380 && li.mOnTouchListener.onTouch(this, event)) { 7381 return true; 7382 } 7383 7384 if (onTouchEvent(event)) { 7385 return true; 7386 } 7387 } 7388 7389 if (mInputEventConsistencyVerifier != null) { 7390 mInputEventConsistencyVerifier.onUnhandledEvent(event, 0); 7391 } 7392 return false; 7393 } 7394 7395 /** 7396 * Filter the touch event to apply security policies. 7397 * 7398 * @param event The motion event to be filtered. 7399 * @return True if the event should be dispatched, false if the event should be dropped. 7400 * 7401 * @see #getFilterTouchesWhenObscured 7402 */ 7403 public boolean onFilterTouchEventForSecurity(MotionEvent event) { 7404 //noinspection RedundantIfStatement 7405 if ((mViewFlags & FILTER_TOUCHES_WHEN_OBSCURED) != 0 7406 && (event.getFlags() & MotionEvent.FLAG_WINDOW_IS_OBSCURED) != 0) { 7407 // Window is obscured, drop this touch. 7408 return false; 7409 } 7410 return true; 7411 } 7412 7413 /** 7414 * Pass a trackball motion event down to the focused view. 7415 * 7416 * @param event The motion event to be dispatched. 7417 * @return True if the event was handled by the view, false otherwise. 7418 */ 7419 public boolean dispatchTrackballEvent(MotionEvent event) { 7420 if (mInputEventConsistencyVerifier != null) { 7421 mInputEventConsistencyVerifier.onTrackballEvent(event, 0); 7422 } 7423 7424 return onTrackballEvent(event); 7425 } 7426 7427 /** 7428 * Dispatch a generic motion event. 7429 * <p> 7430 * Generic motion events with source class {@link InputDevice#SOURCE_CLASS_POINTER} 7431 * are delivered to the view under the pointer. All other generic motion events are 7432 * delivered to the focused view. Hover events are handled specially and are delivered 7433 * to {@link #onHoverEvent(MotionEvent)}. 7434 * </p> 7435 * 7436 * @param event The motion event to be dispatched. 7437 * @return True if the event was handled by the view, false otherwise. 7438 */ 7439 public boolean dispatchGenericMotionEvent(MotionEvent event) { 7440 if (mInputEventConsistencyVerifier != null) { 7441 mInputEventConsistencyVerifier.onGenericMotionEvent(event, 0); 7442 } 7443 7444 final int source = event.getSource(); 7445 if ((source & InputDevice.SOURCE_CLASS_POINTER) != 0) { 7446 final int action = event.getAction(); 7447 if (action == MotionEvent.ACTION_HOVER_ENTER 7448 || action == MotionEvent.ACTION_HOVER_MOVE 7449 || action == MotionEvent.ACTION_HOVER_EXIT) { 7450 if (dispatchHoverEvent(event)) { 7451 return true; 7452 } 7453 } else if (dispatchGenericPointerEvent(event)) { 7454 return true; 7455 } 7456 } else if (dispatchGenericFocusedEvent(event)) { 7457 return true; 7458 } 7459 7460 if (dispatchGenericMotionEventInternal(event)) { 7461 return true; 7462 } 7463 7464 if (mInputEventConsistencyVerifier != null) { 7465 mInputEventConsistencyVerifier.onUnhandledEvent(event, 0); 7466 } 7467 return false; 7468 } 7469 7470 private boolean dispatchGenericMotionEventInternal(MotionEvent event) { 7471 //noinspection SimplifiableIfStatement 7472 ListenerInfo li = mListenerInfo; 7473 if (li != null && li.mOnGenericMotionListener != null 7474 && (mViewFlags & ENABLED_MASK) == ENABLED 7475 && li.mOnGenericMotionListener.onGenericMotion(this, event)) { 7476 return true; 7477 } 7478 7479 if (onGenericMotionEvent(event)) { 7480 return true; 7481 } 7482 7483 if (mInputEventConsistencyVerifier != null) { 7484 mInputEventConsistencyVerifier.onUnhandledEvent(event, 0); 7485 } 7486 return false; 7487 } 7488 7489 /** 7490 * Dispatch a hover event. 7491 * <p> 7492 * Do not call this method directly. 7493 * Call {@link #dispatchGenericMotionEvent(MotionEvent)} instead. 7494 * </p> 7495 * 7496 * @param event The motion event to be dispatched. 7497 * @return True if the event was handled by the view, false otherwise. 7498 */ 7499 protected boolean dispatchHoverEvent(MotionEvent event) { 7500 //noinspection SimplifiableIfStatement 7501 ListenerInfo li = mListenerInfo; 7502 if (li != null && li.mOnHoverListener != null 7503 && (mViewFlags & ENABLED_MASK) == ENABLED 7504 && li.mOnHoverListener.onHover(this, event)) { 7505 return true; 7506 } 7507 7508 return onHoverEvent(event); 7509 } 7510 7511 /** 7512 * Returns true if the view has a child to which it has recently sent 7513 * {@link MotionEvent#ACTION_HOVER_ENTER}. If this view is hovered and 7514 * it does not have a hovered child, then it must be the innermost hovered view. 7515 * @hide 7516 */ 7517 protected boolean hasHoveredChild() { 7518 return false; 7519 } 7520 7521 /** 7522 * Dispatch a generic motion event to the view under the first pointer. 7523 * <p> 7524 * Do not call this method directly. 7525 * Call {@link #dispatchGenericMotionEvent(MotionEvent)} instead. 7526 * </p> 7527 * 7528 * @param event The motion event to be dispatched. 7529 * @return True if the event was handled by the view, false otherwise. 7530 */ 7531 protected boolean dispatchGenericPointerEvent(MotionEvent event) { 7532 return false; 7533 } 7534 7535 /** 7536 * Dispatch a generic motion event to the currently focused view. 7537 * <p> 7538 * Do not call this method directly. 7539 * Call {@link #dispatchGenericMotionEvent(MotionEvent)} instead. 7540 * </p> 7541 * 7542 * @param event The motion event to be dispatched. 7543 * @return True if the event was handled by the view, false otherwise. 7544 */ 7545 protected boolean dispatchGenericFocusedEvent(MotionEvent event) { 7546 return false; 7547 } 7548 7549 /** 7550 * Dispatch a pointer event. 7551 * <p> 7552 * Dispatches touch related pointer events to {@link #onTouchEvent(MotionEvent)} and all 7553 * other events to {@link #onGenericMotionEvent(MotionEvent)}. This separation of concerns 7554 * reinforces the invariant that {@link #onTouchEvent(MotionEvent)} is really about touches 7555 * and should not be expected to handle other pointing device features. 7556 * </p> 7557 * 7558 * @param event The motion event to be dispatched. 7559 * @return True if the event was handled by the view, false otherwise. 7560 * @hide 7561 */ 7562 public final boolean dispatchPointerEvent(MotionEvent event) { 7563 if (event.isTouchEvent()) { 7564 return dispatchTouchEvent(event); 7565 } else { 7566 return dispatchGenericMotionEvent(event); 7567 } 7568 } 7569 7570 /** 7571 * Called when the window containing this view gains or loses window focus. 7572 * ViewGroups should override to route to their children. 7573 * 7574 * @param hasFocus True if the window containing this view now has focus, 7575 * false otherwise. 7576 */ 7577 public void dispatchWindowFocusChanged(boolean hasFocus) { 7578 onWindowFocusChanged(hasFocus); 7579 } 7580 7581 /** 7582 * Called when the window containing this view gains or loses focus. Note 7583 * that this is separate from view focus: to receive key events, both 7584 * your view and its window must have focus. If a window is displayed 7585 * on top of yours that takes input focus, then your own window will lose 7586 * focus but the view focus will remain unchanged. 7587 * 7588 * @param hasWindowFocus True if the window containing this view now has 7589 * focus, false otherwise. 7590 */ 7591 public void onWindowFocusChanged(boolean hasWindowFocus) { 7592 InputMethodManager imm = InputMethodManager.peekInstance(); 7593 if (!hasWindowFocus) { 7594 if (isPressed()) { 7595 setPressed(false); 7596 } 7597 if (imm != null && (mPrivateFlags & PFLAG_FOCUSED) != 0) { 7598 imm.focusOut(this); 7599 } 7600 removeLongPressCallback(); 7601 removeTapCallback(); 7602 onFocusLost(); 7603 } else if (imm != null && (mPrivateFlags & PFLAG_FOCUSED) != 0) { 7604 imm.focusIn(this); 7605 } 7606 refreshDrawableState(); 7607 } 7608 7609 /** 7610 * Returns true if this view is in a window that currently has window focus. 7611 * Note that this is not the same as the view itself having focus. 7612 * 7613 * @return True if this view is in a window that currently has window focus. 7614 */ 7615 public boolean hasWindowFocus() { 7616 return mAttachInfo != null && mAttachInfo.mHasWindowFocus; 7617 } 7618 7619 /** 7620 * Dispatch a view visibility change down the view hierarchy. 7621 * ViewGroups should override to route to their children. 7622 * @param changedView The view whose visibility changed. Could be 'this' or 7623 * an ancestor view. 7624 * @param visibility The new visibility of changedView: {@link #VISIBLE}, 7625 * {@link #INVISIBLE} or {@link #GONE}. 7626 */ 7627 protected void dispatchVisibilityChanged(View changedView, int visibility) { 7628 onVisibilityChanged(changedView, visibility); 7629 } 7630 7631 /** 7632 * Called when the visibility of the view or an ancestor of the view is changed. 7633 * @param changedView The view whose visibility changed. Could be 'this' or 7634 * an ancestor view. 7635 * @param visibility The new visibility of changedView: {@link #VISIBLE}, 7636 * {@link #INVISIBLE} or {@link #GONE}. 7637 */ 7638 protected void onVisibilityChanged(View changedView, int visibility) { 7639 if (visibility == VISIBLE) { 7640 if (mAttachInfo != null) { 7641 initialAwakenScrollBars(); 7642 } else { 7643 mPrivateFlags |= PFLAG_AWAKEN_SCROLL_BARS_ON_ATTACH; 7644 } 7645 } 7646 } 7647 7648 /** 7649 * Dispatch a hint about whether this view is displayed. For instance, when 7650 * a View moves out of the screen, it might receives a display hint indicating 7651 * the view is not displayed. Applications should not <em>rely</em> on this hint 7652 * as there is no guarantee that they will receive one. 7653 * 7654 * @param hint A hint about whether or not this view is displayed: 7655 * {@link #VISIBLE} or {@link #INVISIBLE}. 7656 */ 7657 public void dispatchDisplayHint(int hint) { 7658 onDisplayHint(hint); 7659 } 7660 7661 /** 7662 * Gives this view a hint about whether is displayed or not. For instance, when 7663 * a View moves out of the screen, it might receives a display hint indicating 7664 * the view is not displayed. Applications should not <em>rely</em> on this hint 7665 * as there is no guarantee that they will receive one. 7666 * 7667 * @param hint A hint about whether or not this view is displayed: 7668 * {@link #VISIBLE} or {@link #INVISIBLE}. 7669 */ 7670 protected void onDisplayHint(int hint) { 7671 } 7672 7673 /** 7674 * Dispatch a window visibility change down the view hierarchy. 7675 * ViewGroups should override to route to their children. 7676 * 7677 * @param visibility The new visibility of the window. 7678 * 7679 * @see #onWindowVisibilityChanged(int) 7680 */ 7681 public void dispatchWindowVisibilityChanged(int visibility) { 7682 onWindowVisibilityChanged(visibility); 7683 } 7684 7685 /** 7686 * Called when the window containing has change its visibility 7687 * (between {@link #GONE}, {@link #INVISIBLE}, and {@link #VISIBLE}). Note 7688 * that this tells you whether or not your window is being made visible 7689 * to the window manager; this does <em>not</em> tell you whether or not 7690 * your window is obscured by other windows on the screen, even if it 7691 * is itself visible. 7692 * 7693 * @param visibility The new visibility of the window. 7694 */ 7695 protected void onWindowVisibilityChanged(int visibility) { 7696 if (visibility == VISIBLE) { 7697 initialAwakenScrollBars(); 7698 } 7699 } 7700 7701 /** 7702 * Returns the current visibility of the window this view is attached to 7703 * (either {@link #GONE}, {@link #INVISIBLE}, or {@link #VISIBLE}). 7704 * 7705 * @return Returns the current visibility of the view's window. 7706 */ 7707 public int getWindowVisibility() { 7708 return mAttachInfo != null ? mAttachInfo.mWindowVisibility : GONE; 7709 } 7710 7711 /** 7712 * Retrieve the overall visible display size in which the window this view is 7713 * attached to has been positioned in. This takes into account screen 7714 * decorations above the window, for both cases where the window itself 7715 * is being position inside of them or the window is being placed under 7716 * then and covered insets are used for the window to position its content 7717 * inside. In effect, this tells you the available area where content can 7718 * be placed and remain visible to users. 7719 * 7720 * <p>This function requires an IPC back to the window manager to retrieve 7721 * the requested information, so should not be used in performance critical 7722 * code like drawing. 7723 * 7724 * @param outRect Filled in with the visible display frame. If the view 7725 * is not attached to a window, this is simply the raw display size. 7726 */ 7727 public void getWindowVisibleDisplayFrame(Rect outRect) { 7728 if (mAttachInfo != null) { 7729 try { 7730 mAttachInfo.mSession.getDisplayFrame(mAttachInfo.mWindow, outRect); 7731 } catch (RemoteException e) { 7732 return; 7733 } 7734 // XXX This is really broken, and probably all needs to be done 7735 // in the window manager, and we need to know more about whether 7736 // we want the area behind or in front of the IME. 7737 final Rect insets = mAttachInfo.mVisibleInsets; 7738 outRect.left += insets.left; 7739 outRect.top += insets.top; 7740 outRect.right -= insets.right; 7741 outRect.bottom -= insets.bottom; 7742 return; 7743 } 7744 // The view is not attached to a display so we don't have a context. 7745 // Make a best guess about the display size. 7746 Display d = DisplayManagerGlobal.getInstance().getRealDisplay(Display.DEFAULT_DISPLAY); 7747 d.getRectSize(outRect); 7748 } 7749 7750 /** 7751 * Dispatch a notification about a resource configuration change down 7752 * the view hierarchy. 7753 * ViewGroups should override to route to their children. 7754 * 7755 * @param newConfig The new resource configuration. 7756 * 7757 * @see #onConfigurationChanged(android.content.res.Configuration) 7758 */ 7759 public void dispatchConfigurationChanged(Configuration newConfig) { 7760 onConfigurationChanged(newConfig); 7761 } 7762 7763 /** 7764 * Called when the current configuration of the resources being used 7765 * by the application have changed. You can use this to decide when 7766 * to reload resources that can changed based on orientation and other 7767 * configuration characterstics. You only need to use this if you are 7768 * not relying on the normal {@link android.app.Activity} mechanism of 7769 * recreating the activity instance upon a configuration change. 7770 * 7771 * @param newConfig The new resource configuration. 7772 */ 7773 protected void onConfigurationChanged(Configuration newConfig) { 7774 } 7775 7776 /** 7777 * Private function to aggregate all per-view attributes in to the view 7778 * root. 7779 */ 7780 void dispatchCollectViewAttributes(AttachInfo attachInfo, int visibility) { 7781 performCollectViewAttributes(attachInfo, visibility); 7782 } 7783 7784 void performCollectViewAttributes(AttachInfo attachInfo, int visibility) { 7785 if ((visibility & VISIBILITY_MASK) == VISIBLE) { 7786 if ((mViewFlags & KEEP_SCREEN_ON) == KEEP_SCREEN_ON) { 7787 attachInfo.mKeepScreenOn = true; 7788 } 7789 attachInfo.mSystemUiVisibility |= mSystemUiVisibility; 7790 ListenerInfo li = mListenerInfo; 7791 if (li != null && li.mOnSystemUiVisibilityChangeListener != null) { 7792 attachInfo.mHasSystemUiListeners = true; 7793 } 7794 } 7795 } 7796 7797 void needGlobalAttributesUpdate(boolean force) { 7798 final AttachInfo ai = mAttachInfo; 7799 if (ai != null && !ai.mRecomputeGlobalAttributes) { 7800 if (force || ai.mKeepScreenOn || (ai.mSystemUiVisibility != 0) 7801 || ai.mHasSystemUiListeners) { 7802 ai.mRecomputeGlobalAttributes = true; 7803 } 7804 } 7805 } 7806 7807 /** 7808 * Returns whether the device is currently in touch mode. Touch mode is entered 7809 * once the user begins interacting with the device by touch, and affects various 7810 * things like whether focus is always visible to the user. 7811 * 7812 * @return Whether the device is in touch mode. 7813 */ 7814 @ViewDebug.ExportedProperty 7815 public boolean isInTouchMode() { 7816 if (mAttachInfo != null) { 7817 return mAttachInfo.mInTouchMode; 7818 } else { 7819 return ViewRootImpl.isInTouchMode(); 7820 } 7821 } 7822 7823 /** 7824 * Returns the context the view is running in, through which it can 7825 * access the current theme, resources, etc. 7826 * 7827 * @return The view's Context. 7828 */ 7829 @ViewDebug.CapturedViewProperty 7830 public final Context getContext() { 7831 return mContext; 7832 } 7833 7834 /** 7835 * Handle a key event before it is processed by any input method 7836 * associated with the view hierarchy. This can be used to intercept 7837 * key events in special situations before the IME consumes them; a 7838 * typical example would be handling the BACK key to update the application's 7839 * UI instead of allowing the IME to see it and close itself. 7840 * 7841 * @param keyCode The value in event.getKeyCode(). 7842 * @param event Description of the key event. 7843 * @return If you handled the event, return true. If you want to allow the 7844 * event to be handled by the next receiver, return false. 7845 */ 7846 public boolean onKeyPreIme(int keyCode, KeyEvent event) { 7847 return false; 7848 } 7849 7850 /** 7851 * Default implementation of {@link KeyEvent.Callback#onKeyDown(int, KeyEvent) 7852 * KeyEvent.Callback.onKeyDown()}: perform press of the view 7853 * when {@link KeyEvent#KEYCODE_DPAD_CENTER} or {@link KeyEvent#KEYCODE_ENTER} 7854 * is released, if the view is enabled and clickable. 7855 * 7856 * <p>Key presses in software keyboards will generally NOT trigger this listener, 7857 * although some may elect to do so in some situations. Do not rely on this to 7858 * catch software key presses. 7859 * 7860 * @param keyCode A key code that represents the button pressed, from 7861 * {@link android.view.KeyEvent}. 7862 * @param event The KeyEvent object that defines the button action. 7863 */ 7864 public boolean onKeyDown(int keyCode, KeyEvent event) { 7865 boolean result = false; 7866 7867 switch (keyCode) { 7868 case KeyEvent.KEYCODE_DPAD_CENTER: 7869 case KeyEvent.KEYCODE_ENTER: { 7870 if ((mViewFlags & ENABLED_MASK) == DISABLED) { 7871 return true; 7872 } 7873 // Long clickable items don't necessarily have to be clickable 7874 if (((mViewFlags & CLICKABLE) == CLICKABLE || 7875 (mViewFlags & LONG_CLICKABLE) == LONG_CLICKABLE) && 7876 (event.getRepeatCount() == 0)) { 7877 setPressed(true); 7878 checkForLongClick(0); 7879 return true; 7880 } 7881 break; 7882 } 7883 } 7884 return result; 7885 } 7886 7887 /** 7888 * Default implementation of {@link KeyEvent.Callback#onKeyLongPress(int, KeyEvent) 7889 * KeyEvent.Callback.onKeyLongPress()}: always returns false (doesn't handle 7890 * the event). 7891 * <p>Key presses in software keyboards will generally NOT trigger this listener, 7892 * although some may elect to do so in some situations. Do not rely on this to 7893 * catch software key presses. 7894 */ 7895 public boolean onKeyLongPress(int keyCode, KeyEvent event) { 7896 return false; 7897 } 7898 7899 /** 7900 * Default implementation of {@link KeyEvent.Callback#onKeyUp(int, KeyEvent) 7901 * KeyEvent.Callback.onKeyUp()}: perform clicking of the view 7902 * when {@link KeyEvent#KEYCODE_DPAD_CENTER} or 7903 * {@link KeyEvent#KEYCODE_ENTER} is released. 7904 * <p>Key presses in software keyboards will generally NOT trigger this listener, 7905 * although some may elect to do so in some situations. Do not rely on this to 7906 * catch software key presses. 7907 * 7908 * @param keyCode A key code that represents the button pressed, from 7909 * {@link android.view.KeyEvent}. 7910 * @param event The KeyEvent object that defines the button action. 7911 */ 7912 public boolean onKeyUp(int keyCode, KeyEvent event) { 7913 boolean result = false; 7914 7915 switch (keyCode) { 7916 case KeyEvent.KEYCODE_DPAD_CENTER: 7917 case KeyEvent.KEYCODE_ENTER: { 7918 if ((mViewFlags & ENABLED_MASK) == DISABLED) { 7919 return true; 7920 } 7921 if ((mViewFlags & CLICKABLE) == CLICKABLE && isPressed()) { 7922 setPressed(false); 7923 7924 if (!mHasPerformedLongPress) { 7925 // This is a tap, so remove the longpress check 7926 removeLongPressCallback(); 7927 7928 result = performClick(); 7929 } 7930 } 7931 break; 7932 } 7933 } 7934 return result; 7935 } 7936 7937 /** 7938 * Default implementation of {@link KeyEvent.Callback#onKeyMultiple(int, int, KeyEvent) 7939 * KeyEvent.Callback.onKeyMultiple()}: always returns false (doesn't handle 7940 * the event). 7941 * <p>Key presses in software keyboards will generally NOT trigger this listener, 7942 * although some may elect to do so in some situations. Do not rely on this to 7943 * catch software key presses. 7944 * 7945 * @param keyCode A key code that represents the button pressed, from 7946 * {@link android.view.KeyEvent}. 7947 * @param repeatCount The number of times the action was made. 7948 * @param event The KeyEvent object that defines the button action. 7949 */ 7950 public boolean onKeyMultiple(int keyCode, int repeatCount, KeyEvent event) { 7951 return false; 7952 } 7953 7954 /** 7955 * Called on the focused view when a key shortcut event is not handled. 7956 * Override this method to implement local key shortcuts for the View. 7957 * Key shortcuts can also be implemented by setting the 7958 * {@link MenuItem#setShortcut(char, char) shortcut} property of menu items. 7959 * 7960 * @param keyCode The value in event.getKeyCode(). 7961 * @param event Description of the key event. 7962 * @return If you handled the event, return true. If you want to allow the 7963 * event to be handled by the next receiver, return false. 7964 */ 7965 public boolean onKeyShortcut(int keyCode, KeyEvent event) { 7966 return false; 7967 } 7968 7969 /** 7970 * Check whether the called view is a text editor, in which case it 7971 * would make sense to automatically display a soft input window for 7972 * it. Subclasses should override this if they implement 7973 * {@link #onCreateInputConnection(EditorInfo)} to return true if 7974 * a call on that method would return a non-null InputConnection, and 7975 * they are really a first-class editor that the user would normally 7976 * start typing on when the go into a window containing your view. 7977 * 7978 * <p>The default implementation always returns false. This does 7979 * <em>not</em> mean that its {@link #onCreateInputConnection(EditorInfo)} 7980 * will not be called or the user can not otherwise perform edits on your 7981 * view; it is just a hint to the system that this is not the primary 7982 * purpose of this view. 7983 * 7984 * @return Returns true if this view is a text editor, else false. 7985 */ 7986 public boolean onCheckIsTextEditor() { 7987 return false; 7988 } 7989 7990 /** 7991 * Create a new InputConnection for an InputMethod to interact 7992 * with the view. The default implementation returns null, since it doesn't 7993 * support input methods. You can override this to implement such support. 7994 * This is only needed for views that take focus and text input. 7995 * 7996 * <p>When implementing this, you probably also want to implement 7997 * {@link #onCheckIsTextEditor()} to indicate you will return a 7998 * non-null InputConnection. 7999 * 8000 * @param outAttrs Fill in with attribute information about the connection. 8001 */ 8002 public InputConnection onCreateInputConnection(EditorInfo outAttrs) { 8003 return null; 8004 } 8005 8006 /** 8007 * Called by the {@link android.view.inputmethod.InputMethodManager} 8008 * when a view who is not the current 8009 * input connection target is trying to make a call on the manager. The 8010 * default implementation returns false; you can override this to return 8011 * true for certain views if you are performing InputConnection proxying 8012 * to them. 8013 * @param view The View that is making the InputMethodManager call. 8014 * @return Return true to allow the call, false to reject. 8015 */ 8016 public boolean checkInputConnectionProxy(View view) { 8017 return false; 8018 } 8019 8020 /** 8021 * Show the context menu for this view. It is not safe to hold on to the 8022 * menu after returning from this method. 8023 * 8024 * You should normally not overload this method. Overload 8025 * {@link #onCreateContextMenu(ContextMenu)} or define an 8026 * {@link OnCreateContextMenuListener} to add items to the context menu. 8027 * 8028 * @param menu The context menu to populate 8029 */ 8030 public void createContextMenu(ContextMenu menu) { 8031 ContextMenuInfo menuInfo = getContextMenuInfo(); 8032 8033 // Sets the current menu info so all items added to menu will have 8034 // my extra info set. 8035 ((MenuBuilder)menu).setCurrentMenuInfo(menuInfo); 8036 8037 onCreateContextMenu(menu); 8038 ListenerInfo li = mListenerInfo; 8039 if (li != null && li.mOnCreateContextMenuListener != null) { 8040 li.mOnCreateContextMenuListener.onCreateContextMenu(menu, this, menuInfo); 8041 } 8042 8043 // Clear the extra information so subsequent items that aren't mine don't 8044 // have my extra info. 8045 ((MenuBuilder)menu).setCurrentMenuInfo(null); 8046 8047 if (mParent != null) { 8048 mParent.createContextMenu(menu); 8049 } 8050 } 8051 8052 /** 8053 * Views should implement this if they have extra information to associate 8054 * with the context menu. The return result is supplied as a parameter to 8055 * the {@link OnCreateContextMenuListener#onCreateContextMenu(ContextMenu, View, ContextMenuInfo)} 8056 * callback. 8057 * 8058 * @return Extra information about the item for which the context menu 8059 * should be shown. This information will vary across different 8060 * subclasses of View. 8061 */ 8062 protected ContextMenuInfo getContextMenuInfo() { 8063 return null; 8064 } 8065 8066 /** 8067 * Views should implement this if the view itself is going to add items to 8068 * the context menu. 8069 * 8070 * @param menu the context menu to populate 8071 */ 8072 protected void onCreateContextMenu(ContextMenu menu) { 8073 } 8074 8075 /** 8076 * Implement this method to handle trackball motion events. The 8077 * <em>relative</em> movement of the trackball since the last event 8078 * can be retrieve with {@link MotionEvent#getX MotionEvent.getX()} and 8079 * {@link MotionEvent#getY MotionEvent.getY()}. These are normalized so 8080 * that a movement of 1 corresponds to the user pressing one DPAD key (so 8081 * they will often be fractional values, representing the more fine-grained 8082 * movement information available from a trackball). 8083 * 8084 * @param event The motion event. 8085 * @return True if the event was handled, false otherwise. 8086 */ 8087 public boolean onTrackballEvent(MotionEvent event) { 8088 return false; 8089 } 8090 8091 /** 8092 * Implement this method to handle generic motion events. 8093 * <p> 8094 * Generic motion events describe joystick movements, mouse hovers, track pad 8095 * touches, scroll wheel movements and other input events. The 8096 * {@link MotionEvent#getSource() source} of the motion event specifies 8097 * the class of input that was received. Implementations of this method 8098 * must examine the bits in the source before processing the event. 8099 * The following code example shows how this is done. 8100 * </p><p> 8101 * Generic motion events with source class {@link InputDevice#SOURCE_CLASS_POINTER} 8102 * are delivered to the view under the pointer. All other generic motion events are 8103 * delivered to the focused view. 8104 * </p> 8105 * <pre> public boolean onGenericMotionEvent(MotionEvent event) { 8106 * if (event.isFromSource(InputDevice.SOURCE_CLASS_JOYSTICK)) { 8107 * if (event.getAction() == MotionEvent.ACTION_MOVE) { 8108 * // process the joystick movement... 8109 * return true; 8110 * } 8111 * } 8112 * if (event.isFromSource(InputDevice.SOURCE_CLASS_POINTER)) { 8113 * switch (event.getAction()) { 8114 * case MotionEvent.ACTION_HOVER_MOVE: 8115 * // process the mouse hover movement... 8116 * return true; 8117 * case MotionEvent.ACTION_SCROLL: 8118 * // process the scroll wheel movement... 8119 * return true; 8120 * } 8121 * } 8122 * return super.onGenericMotionEvent(event); 8123 * }</pre> 8124 * 8125 * @param event The generic motion event being processed. 8126 * @return True if the event was handled, false otherwise. 8127 */ 8128 public boolean onGenericMotionEvent(MotionEvent event) { 8129 return false; 8130 } 8131 8132 /** 8133 * Implement this method to handle hover events. 8134 * <p> 8135 * This method is called whenever a pointer is hovering into, over, or out of the 8136 * bounds of a view and the view is not currently being touched. 8137 * Hover events are represented as pointer events with action 8138 * {@link MotionEvent#ACTION_HOVER_ENTER}, {@link MotionEvent#ACTION_HOVER_MOVE}, 8139 * or {@link MotionEvent#ACTION_HOVER_EXIT}. 8140 * </p> 8141 * <ul> 8142 * <li>The view receives a hover event with action {@link MotionEvent#ACTION_HOVER_ENTER} 8143 * when the pointer enters the bounds of the view.</li> 8144 * <li>The view receives a hover event with action {@link MotionEvent#ACTION_HOVER_MOVE} 8145 * when the pointer has already entered the bounds of the view and has moved.</li> 8146 * <li>The view receives a hover event with action {@link MotionEvent#ACTION_HOVER_EXIT} 8147 * when the pointer has exited the bounds of the view or when the pointer is 8148 * about to go down due to a button click, tap, or similar user action that 8149 * causes the view to be touched.</li> 8150 * </ul> 8151 * <p> 8152 * The view should implement this method to return true to indicate that it is 8153 * handling the hover event, such as by changing its drawable state. 8154 * </p><p> 8155 * The default implementation calls {@link #setHovered} to update the hovered state 8156 * of the view when a hover enter or hover exit event is received, if the view 8157 * is enabled and is clickable. The default implementation also sends hover 8158 * accessibility events. 8159 * </p> 8160 * 8161 * @param event The motion event that describes the hover. 8162 * @return True if the view handled the hover event. 8163 * 8164 * @see #isHovered 8165 * @see #setHovered 8166 * @see #onHoverChanged 8167 */ 8168 public boolean onHoverEvent(MotionEvent event) { 8169 // The root view may receive hover (or touch) events that are outside the bounds of 8170 // the window. This code ensures that we only send accessibility events for 8171 // hovers that are actually within the bounds of the root view. 8172 final int action = event.getActionMasked(); 8173 if (!mSendingHoverAccessibilityEvents) { 8174 if ((action == MotionEvent.ACTION_HOVER_ENTER 8175 || action == MotionEvent.ACTION_HOVER_MOVE) 8176 && !hasHoveredChild() 8177 && pointInView(event.getX(), event.getY())) { 8178 sendAccessibilityHoverEvent(AccessibilityEvent.TYPE_VIEW_HOVER_ENTER); 8179 mSendingHoverAccessibilityEvents = true; 8180 } 8181 } else { 8182 if (action == MotionEvent.ACTION_HOVER_EXIT 8183 || (action == MotionEvent.ACTION_MOVE 8184 && !pointInView(event.getX(), event.getY()))) { 8185 mSendingHoverAccessibilityEvents = false; 8186 sendAccessibilityHoverEvent(AccessibilityEvent.TYPE_VIEW_HOVER_EXIT); 8187 // If the window does not have input focus we take away accessibility 8188 // focus as soon as the user stop hovering over the view. 8189 if (mAttachInfo != null && !mAttachInfo.mHasWindowFocus) { 8190 getViewRootImpl().setAccessibilityFocus(null, null); 8191 } 8192 } 8193 } 8194 8195 if (isHoverable()) { 8196 switch (action) { 8197 case MotionEvent.ACTION_HOVER_ENTER: 8198 setHovered(true); 8199 break; 8200 case MotionEvent.ACTION_HOVER_EXIT: 8201 setHovered(false); 8202 break; 8203 } 8204 8205 // Dispatch the event to onGenericMotionEvent before returning true. 8206 // This is to provide compatibility with existing applications that 8207 // handled HOVER_MOVE events in onGenericMotionEvent and that would 8208 // break because of the new default handling for hoverable views 8209 // in onHoverEvent. 8210 // Note that onGenericMotionEvent will be called by default when 8211 // onHoverEvent returns false (refer to dispatchGenericMotionEvent). 8212 dispatchGenericMotionEventInternal(event); 8213 // The event was already handled by calling setHovered(), so always 8214 // return true. 8215 return true; 8216 } 8217 8218 return false; 8219 } 8220 8221 /** 8222 * Returns true if the view should handle {@link #onHoverEvent} 8223 * by calling {@link #setHovered} to change its hovered state. 8224 * 8225 * @return True if the view is hoverable. 8226 */ 8227 private boolean isHoverable() { 8228 final int viewFlags = mViewFlags; 8229 if ((viewFlags & ENABLED_MASK) == DISABLED) { 8230 return false; 8231 } 8232 8233 return (viewFlags & CLICKABLE) == CLICKABLE 8234 || (viewFlags & LONG_CLICKABLE) == LONG_CLICKABLE; 8235 } 8236 8237 /** 8238 * Returns true if the view is currently hovered. 8239 * 8240 * @return True if the view is currently hovered. 8241 * 8242 * @see #setHovered 8243 * @see #onHoverChanged 8244 */ 8245 @ViewDebug.ExportedProperty 8246 public boolean isHovered() { 8247 return (mPrivateFlags & PFLAG_HOVERED) != 0; 8248 } 8249 8250 /** 8251 * Sets whether the view is currently hovered. 8252 * <p> 8253 * Calling this method also changes the drawable state of the view. This 8254 * enables the view to react to hover by using different drawable resources 8255 * to change its appearance. 8256 * </p><p> 8257 * The {@link #onHoverChanged} method is called when the hovered state changes. 8258 * </p> 8259 * 8260 * @param hovered True if the view is hovered. 8261 * 8262 * @see #isHovered 8263 * @see #onHoverChanged 8264 */ 8265 public void setHovered(boolean hovered) { 8266 if (hovered) { 8267 if ((mPrivateFlags & PFLAG_HOVERED) == 0) { 8268 mPrivateFlags |= PFLAG_HOVERED; 8269 refreshDrawableState(); 8270 onHoverChanged(true); 8271 } 8272 } else { 8273 if ((mPrivateFlags & PFLAG_HOVERED) != 0) { 8274 mPrivateFlags &= ~PFLAG_HOVERED; 8275 refreshDrawableState(); 8276 onHoverChanged(false); 8277 } 8278 } 8279 } 8280 8281 /** 8282 * Implement this method to handle hover state changes. 8283 * <p> 8284 * This method is called whenever the hover state changes as a result of a 8285 * call to {@link #setHovered}. 8286 * </p> 8287 * 8288 * @param hovered The current hover state, as returned by {@link #isHovered}. 8289 * 8290 * @see #isHovered 8291 * @see #setHovered 8292 */ 8293 public void onHoverChanged(boolean hovered) { 8294 } 8295 8296 /** 8297 * Implement this method to handle touch screen motion events. 8298 * 8299 * @param event The motion event. 8300 * @return True if the event was handled, false otherwise. 8301 */ 8302 public boolean onTouchEvent(MotionEvent event) { 8303 final int viewFlags = mViewFlags; 8304 8305 if ((viewFlags & ENABLED_MASK) == DISABLED) { 8306 if (event.getAction() == MotionEvent.ACTION_UP && (mPrivateFlags & PFLAG_PRESSED) != 0) { 8307 setPressed(false); 8308 } 8309 // A disabled view that is clickable still consumes the touch 8310 // events, it just doesn't respond to them. 8311 return (((viewFlags & CLICKABLE) == CLICKABLE || 8312 (viewFlags & LONG_CLICKABLE) == LONG_CLICKABLE)); 8313 } 8314 8315 if (mTouchDelegate != null) { 8316 if (mTouchDelegate.onTouchEvent(event)) { 8317 return true; 8318 } 8319 } 8320 8321 if (((viewFlags & CLICKABLE) == CLICKABLE || 8322 (viewFlags & LONG_CLICKABLE) == LONG_CLICKABLE)) { 8323 switch (event.getAction()) { 8324 case MotionEvent.ACTION_UP: 8325 boolean prepressed = (mPrivateFlags & PFLAG_PREPRESSED) != 0; 8326 if ((mPrivateFlags & PFLAG_PRESSED) != 0 || prepressed) { 8327 // take focus if we don't have it already and we should in 8328 // touch mode. 8329 boolean focusTaken = false; 8330 if (isFocusable() && isFocusableInTouchMode() && !isFocused()) { 8331 focusTaken = requestFocus(); 8332 } 8333 8334 if (prepressed) { 8335 // The button is being released before we actually 8336 // showed it as pressed. Make it show the pressed 8337 // state now (before scheduling the click) to ensure 8338 // the user sees it. 8339 setPressed(true); 8340 } 8341 8342 if (!mHasPerformedLongPress) { 8343 // This is a tap, so remove the longpress check 8344 removeLongPressCallback(); 8345 8346 // Only perform take click actions if we were in the pressed state 8347 if (!focusTaken) { 8348 // Use a Runnable and post this rather than calling 8349 // performClick directly. This lets other visual state 8350 // of the view update before click actions start. 8351 if (mPerformClick == null) { 8352 mPerformClick = new PerformClick(); 8353 } 8354 if (!post(mPerformClick)) { 8355 performClick(); 8356 } 8357 } 8358 } 8359 8360 if (mUnsetPressedState == null) { 8361 mUnsetPressedState = new UnsetPressedState(); 8362 } 8363 8364 if (prepressed) { 8365 postDelayed(mUnsetPressedState, 8366 ViewConfiguration.getPressedStateDuration()); 8367 } else if (!post(mUnsetPressedState)) { 8368 // If the post failed, unpress right now 8369 mUnsetPressedState.run(); 8370 } 8371 removeTapCallback(); 8372 } 8373 break; 8374 8375 case MotionEvent.ACTION_DOWN: 8376 mHasPerformedLongPress = false; 8377 8378 if (performButtonActionOnTouchDown(event)) { 8379 break; 8380 } 8381 8382 // Walk up the hierarchy to determine if we're inside a scrolling container. 8383 boolean isInScrollingContainer = isInScrollingContainer(); 8384 8385 // For views inside a scrolling container, delay the pressed feedback for 8386 // a short period in case this is a scroll. 8387 if (isInScrollingContainer) { 8388 mPrivateFlags |= PFLAG_PREPRESSED; 8389 if (mPendingCheckForTap == null) { 8390 mPendingCheckForTap = new CheckForTap(); 8391 } 8392 postDelayed(mPendingCheckForTap, ViewConfiguration.getTapTimeout()); 8393 } else { 8394 // Not inside a scrolling container, so show the feedback right away 8395 setPressed(true); 8396 checkForLongClick(0); 8397 } 8398 break; 8399 8400 case MotionEvent.ACTION_CANCEL: 8401 setPressed(false); 8402 removeTapCallback(); 8403 removeLongPressCallback(); 8404 break; 8405 8406 case MotionEvent.ACTION_MOVE: 8407 final int x = (int) event.getX(); 8408 final int y = (int) event.getY(); 8409 8410 // Be lenient about moving outside of buttons 8411 if (!pointInView(x, y, mTouchSlop)) { 8412 // Outside button 8413 removeTapCallback(); 8414 if ((mPrivateFlags & PFLAG_PRESSED) != 0) { 8415 // Remove any future long press/tap checks 8416 removeLongPressCallback(); 8417 8418 setPressed(false); 8419 } 8420 } 8421 break; 8422 } 8423 return true; 8424 } 8425 8426 return false; 8427 } 8428 8429 /** 8430 * @hide 8431 */ 8432 public boolean isInScrollingContainer() { 8433 ViewParent p = getParent(); 8434 while (p != null && p instanceof ViewGroup) { 8435 if (((ViewGroup) p).shouldDelayChildPressedState()) { 8436 return true; 8437 } 8438 p = p.getParent(); 8439 } 8440 return false; 8441 } 8442 8443 /** 8444 * Remove the longpress detection timer. 8445 */ 8446 private void removeLongPressCallback() { 8447 if (mPendingCheckForLongPress != null) { 8448 removeCallbacks(mPendingCheckForLongPress); 8449 } 8450 } 8451 8452 /** 8453 * Remove the pending click action 8454 */ 8455 private void removePerformClickCallback() { 8456 if (mPerformClick != null) { 8457 removeCallbacks(mPerformClick); 8458 } 8459 } 8460 8461 /** 8462 * Remove the prepress detection timer. 8463 */ 8464 private void removeUnsetPressCallback() { 8465 if ((mPrivateFlags & PFLAG_PRESSED) != 0 && mUnsetPressedState != null) { 8466 setPressed(false); 8467 removeCallbacks(mUnsetPressedState); 8468 } 8469 } 8470 8471 /** 8472 * Remove the tap detection timer. 8473 */ 8474 private void removeTapCallback() { 8475 if (mPendingCheckForTap != null) { 8476 mPrivateFlags &= ~PFLAG_PREPRESSED; 8477 removeCallbacks(mPendingCheckForTap); 8478 } 8479 } 8480 8481 /** 8482 * Cancels a pending long press. Your subclass can use this if you 8483 * want the context menu to come up if the user presses and holds 8484 * at the same place, but you don't want it to come up if they press 8485 * and then move around enough to cause scrolling. 8486 */ 8487 public void cancelLongPress() { 8488 removeLongPressCallback(); 8489 8490 /* 8491 * The prepressed state handled by the tap callback is a display 8492 * construct, but the tap callback will post a long press callback 8493 * less its own timeout. Remove it here. 8494 */ 8495 removeTapCallback(); 8496 } 8497 8498 /** 8499 * Remove the pending callback for sending a 8500 * {@link AccessibilityEvent#TYPE_VIEW_SCROLLED} accessibility event. 8501 */ 8502 private void removeSendViewScrolledAccessibilityEventCallback() { 8503 if (mSendViewScrolledAccessibilityEvent != null) { 8504 removeCallbacks(mSendViewScrolledAccessibilityEvent); 8505 mSendViewScrolledAccessibilityEvent.mIsPending = false; 8506 } 8507 } 8508 8509 /** 8510 * Sets the TouchDelegate for this View. 8511 */ 8512 public void setTouchDelegate(TouchDelegate delegate) { 8513 mTouchDelegate = delegate; 8514 } 8515 8516 /** 8517 * Gets the TouchDelegate for this View. 8518 */ 8519 public TouchDelegate getTouchDelegate() { 8520 return mTouchDelegate; 8521 } 8522 8523 /** 8524 * Set flags controlling behavior of this view. 8525 * 8526 * @param flags Constant indicating the value which should be set 8527 * @param mask Constant indicating the bit range that should be changed 8528 */ 8529 void setFlags(int flags, int mask) { 8530 int old = mViewFlags; 8531 mViewFlags = (mViewFlags & ~mask) | (flags & mask); 8532 8533 int changed = mViewFlags ^ old; 8534 if (changed == 0) { 8535 return; 8536 } 8537 int privateFlags = mPrivateFlags; 8538 8539 /* Check if the FOCUSABLE bit has changed */ 8540 if (((changed & FOCUSABLE_MASK) != 0) && 8541 ((privateFlags & PFLAG_HAS_BOUNDS) !=0)) { 8542 if (((old & FOCUSABLE_MASK) == FOCUSABLE) 8543 && ((privateFlags & PFLAG_FOCUSED) != 0)) { 8544 /* Give up focus if we are no longer focusable */ 8545 clearFocus(); 8546 } else if (((old & FOCUSABLE_MASK) == NOT_FOCUSABLE) 8547 && ((privateFlags & PFLAG_FOCUSED) == 0)) { 8548 /* 8549 * Tell the view system that we are now available to take focus 8550 * if no one else already has it. 8551 */ 8552 if (mParent != null) mParent.focusableViewAvailable(this); 8553 } 8554 if (AccessibilityManager.getInstance(mContext).isEnabled()) { 8555 notifyAccessibilityStateChanged(); 8556 } 8557 } 8558 8559 if ((flags & VISIBILITY_MASK) == VISIBLE) { 8560 if ((changed & VISIBILITY_MASK) != 0) { 8561 /* 8562 * If this view is becoming visible, invalidate it in case it changed while 8563 * it was not visible. Marking it drawn ensures that the invalidation will 8564 * go through. 8565 */ 8566 mPrivateFlags |= PFLAG_DRAWN; 8567 invalidate(true); 8568 8569 needGlobalAttributesUpdate(true); 8570 8571 // a view becoming visible is worth notifying the parent 8572 // about in case nothing has focus. even if this specific view 8573 // isn't focusable, it may contain something that is, so let 8574 // the root view try to give this focus if nothing else does. 8575 if ((mParent != null) && (mBottom > mTop) && (mRight > mLeft)) { 8576 mParent.focusableViewAvailable(this); 8577 } 8578 } 8579 } 8580 8581 /* Check if the GONE bit has changed */ 8582 if ((changed & GONE) != 0) { 8583 needGlobalAttributesUpdate(false); 8584 requestLayout(); 8585 8586 if (((mViewFlags & VISIBILITY_MASK) == GONE)) { 8587 if (hasFocus()) clearFocus(); 8588 clearAccessibilityFocus(); 8589 destroyDrawingCache(); 8590 if (mParent instanceof View) { 8591 // GONE views noop invalidation, so invalidate the parent 8592 ((View) mParent).invalidate(true); 8593 } 8594 // Mark the view drawn to ensure that it gets invalidated properly the next 8595 // time it is visible and gets invalidated 8596 mPrivateFlags |= PFLAG_DRAWN; 8597 } 8598 if (mAttachInfo != null) { 8599 mAttachInfo.mViewVisibilityChanged = true; 8600 } 8601 } 8602 8603 /* Check if the VISIBLE bit has changed */ 8604 if ((changed & INVISIBLE) != 0) { 8605 needGlobalAttributesUpdate(false); 8606 /* 8607 * If this view is becoming invisible, set the DRAWN flag so that 8608 * the next invalidate() will not be skipped. 8609 */ 8610 mPrivateFlags |= PFLAG_DRAWN; 8611 8612 if (((mViewFlags & VISIBILITY_MASK) == INVISIBLE) && hasFocus()) { 8613 // root view becoming invisible shouldn't clear focus and accessibility focus 8614 if (getRootView() != this) { 8615 clearFocus(); 8616 clearAccessibilityFocus(); 8617 } 8618 } 8619 if (mAttachInfo != null) { 8620 mAttachInfo.mViewVisibilityChanged = true; 8621 } 8622 } 8623 8624 if ((changed & VISIBILITY_MASK) != 0) { 8625 if (mParent instanceof ViewGroup) { 8626 ((ViewGroup) mParent).onChildVisibilityChanged(this, 8627 (changed & VISIBILITY_MASK), (flags & VISIBILITY_MASK)); 8628 ((View) mParent).invalidate(true); 8629 } else if (mParent != null) { 8630 mParent.invalidateChild(this, null); 8631 } 8632 dispatchVisibilityChanged(this, (flags & VISIBILITY_MASK)); 8633 } 8634 8635 if ((changed & WILL_NOT_CACHE_DRAWING) != 0) { 8636 destroyDrawingCache(); 8637 } 8638 8639 if ((changed & DRAWING_CACHE_ENABLED) != 0) { 8640 destroyDrawingCache(); 8641 mPrivateFlags &= ~PFLAG_DRAWING_CACHE_VALID; 8642 invalidateParentCaches(); 8643 } 8644 8645 if ((changed & DRAWING_CACHE_QUALITY_MASK) != 0) { 8646 destroyDrawingCache(); 8647 mPrivateFlags &= ~PFLAG_DRAWING_CACHE_VALID; 8648 } 8649 8650 if ((changed & DRAW_MASK) != 0) { 8651 if ((mViewFlags & WILL_NOT_DRAW) != 0) { 8652 if (mBackground != null) { 8653 mPrivateFlags &= ~PFLAG_SKIP_DRAW; 8654 mPrivateFlags |= PFLAG_ONLY_DRAWS_BACKGROUND; 8655 } else { 8656 mPrivateFlags |= PFLAG_SKIP_DRAW; 8657 } 8658 } else { 8659 mPrivateFlags &= ~PFLAG_SKIP_DRAW; 8660 } 8661 requestLayout(); 8662 invalidate(true); 8663 } 8664 8665 if ((changed & KEEP_SCREEN_ON) != 0) { 8666 if (mParent != null && mAttachInfo != null && !mAttachInfo.mRecomputeGlobalAttributes) { 8667 mParent.recomputeViewAttributes(this); 8668 } 8669 } 8670 8671 if (AccessibilityManager.getInstance(mContext).isEnabled() 8672 && ((changed & FOCUSABLE) != 0 || (changed & CLICKABLE) != 0 8673 || (changed & LONG_CLICKABLE) != 0 || (changed & ENABLED) != 0)) { 8674 notifyAccessibilityStateChanged(); 8675 } 8676 } 8677 8678 /** 8679 * Change the view's z order in the tree, so it's on top of other sibling 8680 * views. This ordering change may affect layout, if the parent container 8681 * uses an order-dependent layout scheme (e.g., LinearLayout). This 8682 * method should be followed by calls to {@link #requestLayout()} and 8683 * {@link View#invalidate()} on the parent. 8684 * 8685 * @see ViewGroup#bringChildToFront(View) 8686 */ 8687 public void bringToFront() { 8688 if (mParent != null) { 8689 mParent.bringChildToFront(this); 8690 } 8691 } 8692 8693 /** 8694 * This is called in response to an internal scroll in this view (i.e., the 8695 * view scrolled its own contents). This is typically as a result of 8696 * {@link #scrollBy(int, int)} or {@link #scrollTo(int, int)} having been 8697 * called. 8698 * 8699 * @param l Current horizontal scroll origin. 8700 * @param t Current vertical scroll origin. 8701 * @param oldl Previous horizontal scroll origin. 8702 * @param oldt Previous vertical scroll origin. 8703 */ 8704 protected void onScrollChanged(int l, int t, int oldl, int oldt) { 8705 if (AccessibilityManager.getInstance(mContext).isEnabled()) { 8706 postSendViewScrolledAccessibilityEventCallback(); 8707 } 8708 8709 mBackgroundSizeChanged = true; 8710 8711 final AttachInfo ai = mAttachInfo; 8712 if (ai != null) { 8713 ai.mViewScrollChanged = true; 8714 } 8715 } 8716 8717 /** 8718 * Interface definition for a callback to be invoked when the layout bounds of a view 8719 * changes due to layout processing. 8720 */ 8721 public interface OnLayoutChangeListener { 8722 /** 8723 * Called when the focus state of a view has changed. 8724 * 8725 * @param v The view whose state has changed. 8726 * @param left The new value of the view's left property. 8727 * @param top The new value of the view's top property. 8728 * @param right The new value of the view's right property. 8729 * @param bottom The new value of the view's bottom property. 8730 * @param oldLeft The previous value of the view's left property. 8731 * @param oldTop The previous value of the view's top property. 8732 * @param oldRight The previous value of the view's right property. 8733 * @param oldBottom The previous value of the view's bottom property. 8734 */ 8735 void onLayoutChange(View v, int left, int top, int right, int bottom, 8736 int oldLeft, int oldTop, int oldRight, int oldBottom); 8737 } 8738 8739 /** 8740 * This is called during layout when the size of this view has changed. If 8741 * you were just added to the view hierarchy, you're called with the old 8742 * values of 0. 8743 * 8744 * @param w Current width of this view. 8745 * @param h Current height of this view. 8746 * @param oldw Old width of this view. 8747 * @param oldh Old height of this view. 8748 */ 8749 protected void onSizeChanged(int w, int h, int oldw, int oldh) { 8750 } 8751 8752 /** 8753 * Called by draw to draw the child views. This may be overridden 8754 * by derived classes to gain control just before its children are drawn 8755 * (but after its own view has been drawn). 8756 * @param canvas the canvas on which to draw the view 8757 */ 8758 protected void dispatchDraw(Canvas canvas) { 8759 8760 } 8761 8762 /** 8763 * Gets the parent of this view. Note that the parent is a 8764 * ViewParent and not necessarily a View. 8765 * 8766 * @return Parent of this view. 8767 */ 8768 public final ViewParent getParent() { 8769 return mParent; 8770 } 8771 8772 /** 8773 * Set the horizontal scrolled position of your view. This will cause a call to 8774 * {@link #onScrollChanged(int, int, int, int)} and the view will be 8775 * invalidated. 8776 * @param value the x position to scroll to 8777 */ 8778 public void setScrollX(int value) { 8779 scrollTo(value, mScrollY); 8780 } 8781 8782 /** 8783 * Set the vertical scrolled position of your view. This will cause a call to 8784 * {@link #onScrollChanged(int, int, int, int)} and the view will be 8785 * invalidated. 8786 * @param value the y position to scroll to 8787 */ 8788 public void setScrollY(int value) { 8789 scrollTo(mScrollX, value); 8790 } 8791 8792 /** 8793 * Return the scrolled left position of this view. This is the left edge of 8794 * the displayed part of your view. You do not need to draw any pixels 8795 * farther left, since those are outside of the frame of your view on 8796 * screen. 8797 * 8798 * @return The left edge of the displayed part of your view, in pixels. 8799 */ 8800 public final int getScrollX() { 8801 return mScrollX; 8802 } 8803 8804 /** 8805 * Return the scrolled top position of this view. This is the top edge of 8806 * the displayed part of your view. You do not need to draw any pixels above 8807 * it, since those are outside of the frame of your view on screen. 8808 * 8809 * @return The top edge of the displayed part of your view, in pixels. 8810 */ 8811 public final int getScrollY() { 8812 return mScrollY; 8813 } 8814 8815 /** 8816 * Return the width of the your view. 8817 * 8818 * @return The width of your view, in pixels. 8819 */ 8820 @ViewDebug.ExportedProperty(category = "layout") 8821 public final int getWidth() { 8822 return mRight - mLeft; 8823 } 8824 8825 /** 8826 * Return the height of your view. 8827 * 8828 * @return The height of your view, in pixels. 8829 */ 8830 @ViewDebug.ExportedProperty(category = "layout") 8831 public final int getHeight() { 8832 return mBottom - mTop; 8833 } 8834 8835 /** 8836 * Return the visible drawing bounds of your view. Fills in the output 8837 * rectangle with the values from getScrollX(), getScrollY(), 8838 * getWidth(), and getHeight(). These bounds do not account for any 8839 * transformation properties currently set on the view, such as 8840 * {@link #setScaleX(float)} or {@link #setRotation(float)}. 8841 * 8842 * @param outRect The (scrolled) drawing bounds of the view. 8843 */ 8844 public void getDrawingRect(Rect outRect) { 8845 outRect.left = mScrollX; 8846 outRect.top = mScrollY; 8847 outRect.right = mScrollX + (mRight - mLeft); 8848 outRect.bottom = mScrollY + (mBottom - mTop); 8849 } 8850 8851 /** 8852 * Like {@link #getMeasuredWidthAndState()}, but only returns the 8853 * raw width component (that is the result is masked by 8854 * {@link #MEASURED_SIZE_MASK}). 8855 * 8856 * @return The raw measured width of this view. 8857 */ 8858 public final int getMeasuredWidth() { 8859 return mMeasuredWidth & MEASURED_SIZE_MASK; 8860 } 8861 8862 /** 8863 * Return the full width measurement information for this view as computed 8864 * by the most recent call to {@link #measure(int, int)}. This result is a bit mask 8865 * as defined by {@link #MEASURED_SIZE_MASK} and {@link #MEASURED_STATE_TOO_SMALL}. 8866 * This should be used during measurement and layout calculations only. Use 8867 * {@link #getWidth()} to see how wide a view is after layout. 8868 * 8869 * @return The measured width of this view as a bit mask. 8870 */ 8871 public final int getMeasuredWidthAndState() { 8872 return mMeasuredWidth; 8873 } 8874 8875 /** 8876 * Like {@link #getMeasuredHeightAndState()}, but only returns the 8877 * raw width component (that is the result is masked by 8878 * {@link #MEASURED_SIZE_MASK}). 8879 * 8880 * @return The raw measured height of this view. 8881 */ 8882 public final int getMeasuredHeight() { 8883 return mMeasuredHeight & MEASURED_SIZE_MASK; 8884 } 8885 8886 /** 8887 * Return the full height measurement information for this view as computed 8888 * by the most recent call to {@link #measure(int, int)}. This result is a bit mask 8889 * as defined by {@link #MEASURED_SIZE_MASK} and {@link #MEASURED_STATE_TOO_SMALL}. 8890 * This should be used during measurement and layout calculations only. Use 8891 * {@link #getHeight()} to see how wide a view is after layout. 8892 * 8893 * @return The measured width of this view as a bit mask. 8894 */ 8895 public final int getMeasuredHeightAndState() { 8896 return mMeasuredHeight; 8897 } 8898 8899 /** 8900 * Return only the state bits of {@link #getMeasuredWidthAndState()} 8901 * and {@link #getMeasuredHeightAndState()}, combined into one integer. 8902 * The width component is in the regular bits {@link #MEASURED_STATE_MASK} 8903 * and the height component is at the shifted bits 8904 * {@link #MEASURED_HEIGHT_STATE_SHIFT}>>{@link #MEASURED_STATE_MASK}. 8905 */ 8906 public final int getMeasuredState() { 8907 return (mMeasuredWidth&MEASURED_STATE_MASK) 8908 | ((mMeasuredHeight>>MEASURED_HEIGHT_STATE_SHIFT) 8909 & (MEASURED_STATE_MASK>>MEASURED_HEIGHT_STATE_SHIFT)); 8910 } 8911 8912 /** 8913 * The transform matrix of this view, which is calculated based on the current 8914 * roation, scale, and pivot properties. 8915 * 8916 * @see #getRotation() 8917 * @see #getScaleX() 8918 * @see #getScaleY() 8919 * @see #getPivotX() 8920 * @see #getPivotY() 8921 * @return The current transform matrix for the view 8922 */ 8923 public Matrix getMatrix() { 8924 if (mTransformationInfo != null) { 8925 updateMatrix(); 8926 return mTransformationInfo.mMatrix; 8927 } 8928 return Matrix.IDENTITY_MATRIX; 8929 } 8930 8931 /** 8932 * Utility function to determine if the value is far enough away from zero to be 8933 * considered non-zero. 8934 * @param value A floating point value to check for zero-ness 8935 * @return whether the passed-in value is far enough away from zero to be considered non-zero 8936 */ 8937 private static boolean nonzero(float value) { 8938 return (value < -NONZERO_EPSILON || value > NONZERO_EPSILON); 8939 } 8940 8941 /** 8942 * Returns true if the transform matrix is the identity matrix. 8943 * Recomputes the matrix if necessary. 8944 * 8945 * @return True if the transform matrix is the identity matrix, false otherwise. 8946 */ 8947 final boolean hasIdentityMatrix() { 8948 if (mTransformationInfo != null) { 8949 updateMatrix(); 8950 return mTransformationInfo.mMatrixIsIdentity; 8951 } 8952 return true; 8953 } 8954 8955 void ensureTransformationInfo() { 8956 if (mTransformationInfo == null) { 8957 mTransformationInfo = new TransformationInfo(); 8958 } 8959 } 8960 8961 /** 8962 * Recomputes the transform matrix if necessary. 8963 */ 8964 private void updateMatrix() { 8965 final TransformationInfo info = mTransformationInfo; 8966 if (info == null) { 8967 return; 8968 } 8969 if (info.mMatrixDirty) { 8970 // transform-related properties have changed since the last time someone 8971 // asked for the matrix; recalculate it with the current values 8972 8973 // Figure out if we need to update the pivot point 8974 if ((mPrivateFlags & PFLAG_PIVOT_EXPLICITLY_SET) == 0) { 8975 if ((mRight - mLeft) != info.mPrevWidth || (mBottom - mTop) != info.mPrevHeight) { 8976 info.mPrevWidth = mRight - mLeft; 8977 info.mPrevHeight = mBottom - mTop; 8978 info.mPivotX = info.mPrevWidth / 2f; 8979 info.mPivotY = info.mPrevHeight / 2f; 8980 } 8981 } 8982 info.mMatrix.reset(); 8983 if (!nonzero(info.mRotationX) && !nonzero(info.mRotationY)) { 8984 info.mMatrix.setTranslate(info.mTranslationX, info.mTranslationY); 8985 info.mMatrix.preRotate(info.mRotation, info.mPivotX, info.mPivotY); 8986 info.mMatrix.preScale(info.mScaleX, info.mScaleY, info.mPivotX, info.mPivotY); 8987 } else { 8988 if (info.mCamera == null) { 8989 info.mCamera = new Camera(); 8990 info.matrix3D = new Matrix(); 8991 } 8992 info.mCamera.save(); 8993 info.mMatrix.preScale(info.mScaleX, info.mScaleY, info.mPivotX, info.mPivotY); 8994 info.mCamera.rotate(info.mRotationX, info.mRotationY, -info.mRotation); 8995 info.mCamera.getMatrix(info.matrix3D); 8996 info.matrix3D.preTranslate(-info.mPivotX, -info.mPivotY); 8997 info.matrix3D.postTranslate(info.mPivotX + info.mTranslationX, 8998 info.mPivotY + info.mTranslationY); 8999 info.mMatrix.postConcat(info.matrix3D); 9000 info.mCamera.restore(); 9001 } 9002 info.mMatrixDirty = false; 9003 info.mMatrixIsIdentity = info.mMatrix.isIdentity(); 9004 info.mInverseMatrixDirty = true; 9005 } 9006 } 9007 9008 /** 9009 * Utility method to retrieve the inverse of the current mMatrix property. 9010 * We cache the matrix to avoid recalculating it when transform properties 9011 * have not changed. 9012 * 9013 * @return The inverse of the current matrix of this view. 9014 */ 9015 final Matrix getInverseMatrix() { 9016 final TransformationInfo info = mTransformationInfo; 9017 if (info != null) { 9018 updateMatrix(); 9019 if (info.mInverseMatrixDirty) { 9020 if (info.mInverseMatrix == null) { 9021 info.mInverseMatrix = new Matrix(); 9022 } 9023 info.mMatrix.invert(info.mInverseMatrix); 9024 info.mInverseMatrixDirty = false; 9025 } 9026 return info.mInverseMatrix; 9027 } 9028 return Matrix.IDENTITY_MATRIX; 9029 } 9030 9031 /** 9032 * Gets the distance along the Z axis from the camera to this view. 9033 * 9034 * @see #setCameraDistance(float) 9035 * 9036 * @return The distance along the Z axis. 9037 */ 9038 public float getCameraDistance() { 9039 ensureTransformationInfo(); 9040 final float dpi = mResources.getDisplayMetrics().densityDpi; 9041 final TransformationInfo info = mTransformationInfo; 9042 if (info.mCamera == null) { 9043 info.mCamera = new Camera(); 9044 info.matrix3D = new Matrix(); 9045 } 9046 return -(info.mCamera.getLocationZ() * dpi); 9047 } 9048 9049 /** 9050 * <p>Sets the distance along the Z axis (orthogonal to the X/Y plane on which 9051 * views are drawn) from the camera to this view. The camera's distance 9052 * affects 3D transformations, for instance rotations around the X and Y 9053 * axis. If the rotationX or rotationY properties are changed and this view is 9054 * large (more than half the size of the screen), it is recommended to always 9055 * use a camera distance that's greater than the height (X axis rotation) or 9056 * the width (Y axis rotation) of this view.</p> 9057 * 9058 * <p>The distance of the camera from the view plane can have an affect on the 9059 * perspective distortion of the view when it is rotated around the x or y axis. 9060 * For example, a large distance will result in a large viewing angle, and there 9061 * will not be much perspective distortion of the view as it rotates. A short 9062 * distance may cause much more perspective distortion upon rotation, and can 9063 * also result in some drawing artifacts if the rotated view ends up partially 9064 * behind the camera (which is why the recommendation is to use a distance at 9065 * least as far as the size of the view, if the view is to be rotated.)</p> 9066 * 9067 * <p>The distance is expressed in "depth pixels." The default distance depends 9068 * on the screen density. For instance, on a medium density display, the 9069 * default distance is 1280. On a high density display, the default distance 9070 * is 1920.</p> 9071 * 9072 * <p>If you want to specify a distance that leads to visually consistent 9073 * results across various densities, use the following formula:</p> 9074 * <pre> 9075 * float scale = context.getResources().getDisplayMetrics().density; 9076 * view.setCameraDistance(distance * scale); 9077 * </pre> 9078 * 9079 * <p>The density scale factor of a high density display is 1.5, 9080 * and 1920 = 1280 * 1.5.</p> 9081 * 9082 * @param distance The distance in "depth pixels", if negative the opposite 9083 * value is used 9084 * 9085 * @see #setRotationX(float) 9086 * @see #setRotationY(float) 9087 */ 9088 public void setCameraDistance(float distance) { 9089 invalidateViewProperty(true, false); 9090 9091 ensureTransformationInfo(); 9092 final float dpi = mResources.getDisplayMetrics().densityDpi; 9093 final TransformationInfo info = mTransformationInfo; 9094 if (info.mCamera == null) { 9095 info.mCamera = new Camera(); 9096 info.matrix3D = new Matrix(); 9097 } 9098 9099 info.mCamera.setLocation(0.0f, 0.0f, -Math.abs(distance) / dpi); 9100 info.mMatrixDirty = true; 9101 9102 invalidateViewProperty(false, false); 9103 if (mDisplayList != null) { 9104 mDisplayList.setCameraDistance(-Math.abs(distance) / dpi); 9105 } 9106 if ((mPrivateFlags2 & PFLAG2_VIEW_QUICK_REJECTED) == PFLAG2_VIEW_QUICK_REJECTED) { 9107 // View was rejected last time it was drawn by its parent; this may have changed 9108 invalidateParentIfNeeded(); 9109 } 9110 } 9111 9112 /** 9113 * The degrees that the view is rotated around the pivot point. 9114 * 9115 * @see #setRotation(float) 9116 * @see #getPivotX() 9117 * @see #getPivotY() 9118 * 9119 * @return The degrees of rotation. 9120 */ 9121 @ViewDebug.ExportedProperty(category = "drawing") 9122 public float getRotation() { 9123 return mTransformationInfo != null ? mTransformationInfo.mRotation : 0; 9124 } 9125 9126 /** 9127 * Sets the degrees that the view is rotated around the pivot point. Increasing values 9128 * result in clockwise rotation. 9129 * 9130 * @param rotation The degrees of rotation. 9131 * 9132 * @see #getRotation() 9133 * @see #getPivotX() 9134 * @see #getPivotY() 9135 * @see #setRotationX(float) 9136 * @see #setRotationY(float) 9137 * 9138 * @attr ref android.R.styleable#View_rotation 9139 */ 9140 public void setRotation(float rotation) { 9141 ensureTransformationInfo(); 9142 final TransformationInfo info = mTransformationInfo; 9143 if (info.mRotation != rotation) { 9144 // Double-invalidation is necessary to capture view's old and new areas 9145 invalidateViewProperty(true, false); 9146 info.mRotation = rotation; 9147 info.mMatrixDirty = true; 9148 invalidateViewProperty(false, true); 9149 if (mDisplayList != null) { 9150 mDisplayList.setRotation(rotation); 9151 } 9152 if ((mPrivateFlags2 & PFLAG2_VIEW_QUICK_REJECTED) == PFLAG2_VIEW_QUICK_REJECTED) { 9153 // View was rejected last time it was drawn by its parent; this may have changed 9154 invalidateParentIfNeeded(); 9155 } 9156 } 9157 } 9158 9159 /** 9160 * The degrees that the view is rotated around the vertical axis through the pivot point. 9161 * 9162 * @see #getPivotX() 9163 * @see #getPivotY() 9164 * @see #setRotationY(float) 9165 * 9166 * @return The degrees of Y rotation. 9167 */ 9168 @ViewDebug.ExportedProperty(category = "drawing") 9169 public float getRotationY() { 9170 return mTransformationInfo != null ? mTransformationInfo.mRotationY : 0; 9171 } 9172 9173 /** 9174 * Sets the degrees that the view is rotated around the vertical axis through the pivot point. 9175 * Increasing values result in counter-clockwise rotation from the viewpoint of looking 9176 * down the y axis. 9177 * 9178 * When rotating large views, it is recommended to adjust the camera distance 9179 * accordingly. Refer to {@link #setCameraDistance(float)} for more information. 9180 * 9181 * @param rotationY The degrees of Y rotation. 9182 * 9183 * @see #getRotationY() 9184 * @see #getPivotX() 9185 * @see #getPivotY() 9186 * @see #setRotation(float) 9187 * @see #setRotationX(float) 9188 * @see #setCameraDistance(float) 9189 * 9190 * @attr ref android.R.styleable#View_rotationY 9191 */ 9192 public void setRotationY(float rotationY) { 9193 ensureTransformationInfo(); 9194 final TransformationInfo info = mTransformationInfo; 9195 if (info.mRotationY != rotationY) { 9196 invalidateViewProperty(true, false); 9197 info.mRotationY = rotationY; 9198 info.mMatrixDirty = true; 9199 invalidateViewProperty(false, true); 9200 if (mDisplayList != null) { 9201 mDisplayList.setRotationY(rotationY); 9202 } 9203 if ((mPrivateFlags2 & PFLAG2_VIEW_QUICK_REJECTED) == PFLAG2_VIEW_QUICK_REJECTED) { 9204 // View was rejected last time it was drawn by its parent; this may have changed 9205 invalidateParentIfNeeded(); 9206 } 9207 } 9208 } 9209 9210 /** 9211 * The degrees that the view is rotated around the horizontal axis through the pivot point. 9212 * 9213 * @see #getPivotX() 9214 * @see #getPivotY() 9215 * @see #setRotationX(float) 9216 * 9217 * @return The degrees of X rotation. 9218 */ 9219 @ViewDebug.ExportedProperty(category = "drawing") 9220 public float getRotationX() { 9221 return mTransformationInfo != null ? mTransformationInfo.mRotationX : 0; 9222 } 9223 9224 /** 9225 * Sets the degrees that the view is rotated around the horizontal axis through the pivot point. 9226 * Increasing values result in clockwise rotation from the viewpoint of looking down the 9227 * x axis. 9228 * 9229 * When rotating large views, it is recommended to adjust the camera distance 9230 * accordingly. Refer to {@link #setCameraDistance(float)} for more information. 9231 * 9232 * @param rotationX The degrees of X rotation. 9233 * 9234 * @see #getRotationX() 9235 * @see #getPivotX() 9236 * @see #getPivotY() 9237 * @see #setRotation(float) 9238 * @see #setRotationY(float) 9239 * @see #setCameraDistance(float) 9240 * 9241 * @attr ref android.R.styleable#View_rotationX 9242 */ 9243 public void setRotationX(float rotationX) { 9244 ensureTransformationInfo(); 9245 final TransformationInfo info = mTransformationInfo; 9246 if (info.mRotationX != rotationX) { 9247 invalidateViewProperty(true, false); 9248 info.mRotationX = rotationX; 9249 info.mMatrixDirty = true; 9250 invalidateViewProperty(false, true); 9251 if (mDisplayList != null) { 9252 mDisplayList.setRotationX(rotationX); 9253 } 9254 if ((mPrivateFlags2 & PFLAG2_VIEW_QUICK_REJECTED) == PFLAG2_VIEW_QUICK_REJECTED) { 9255 // View was rejected last time it was drawn by its parent; this may have changed 9256 invalidateParentIfNeeded(); 9257 } 9258 } 9259 } 9260 9261 /** 9262 * The amount that the view is scaled in x around the pivot point, as a proportion of 9263 * the view's unscaled width. A value of 1, the default, means that no scaling is applied. 9264 * 9265 * <p>By default, this is 1.0f. 9266 * 9267 * @see #getPivotX() 9268 * @see #getPivotY() 9269 * @return The scaling factor. 9270 */ 9271 @ViewDebug.ExportedProperty(category = "drawing") 9272 public float getScaleX() { 9273 return mTransformationInfo != null ? mTransformationInfo.mScaleX : 1; 9274 } 9275 9276 /** 9277 * Sets the amount that the view is scaled in x around the pivot point, as a proportion of 9278 * the view's unscaled width. A value of 1 means that no scaling is applied. 9279 * 9280 * @param scaleX The scaling factor. 9281 * @see #getPivotX() 9282 * @see #getPivotY() 9283 * 9284 * @attr ref android.R.styleable#View_scaleX 9285 */ 9286 public void setScaleX(float scaleX) { 9287 ensureTransformationInfo(); 9288 final TransformationInfo info = mTransformationInfo; 9289 if (info.mScaleX != scaleX) { 9290 invalidateViewProperty(true, false); 9291 info.mScaleX = scaleX; 9292 info.mMatrixDirty = true; 9293 invalidateViewProperty(false, true); 9294 if (mDisplayList != null) { 9295 mDisplayList.setScaleX(scaleX); 9296 } 9297 if ((mPrivateFlags2 & PFLAG2_VIEW_QUICK_REJECTED) == PFLAG2_VIEW_QUICK_REJECTED) { 9298 // View was rejected last time it was drawn by its parent; this may have changed 9299 invalidateParentIfNeeded(); 9300 } 9301 } 9302 } 9303 9304 /** 9305 * The amount that the view is scaled in y around the pivot point, as a proportion of 9306 * the view's unscaled height. A value of 1, the default, means that no scaling is applied. 9307 * 9308 * <p>By default, this is 1.0f. 9309 * 9310 * @see #getPivotX() 9311 * @see #getPivotY() 9312 * @return The scaling factor. 9313 */ 9314 @ViewDebug.ExportedProperty(category = "drawing") 9315 public float getScaleY() { 9316 return mTransformationInfo != null ? mTransformationInfo.mScaleY : 1; 9317 } 9318 9319 /** 9320 * Sets the amount that the view is scaled in Y around the pivot point, as a proportion of 9321 * the view's unscaled width. A value of 1 means that no scaling is applied. 9322 * 9323 * @param scaleY The scaling factor. 9324 * @see #getPivotX() 9325 * @see #getPivotY() 9326 * 9327 * @attr ref android.R.styleable#View_scaleY 9328 */ 9329 public void setScaleY(float scaleY) { 9330 ensureTransformationInfo(); 9331 final TransformationInfo info = mTransformationInfo; 9332 if (info.mScaleY != scaleY) { 9333 invalidateViewProperty(true, false); 9334 info.mScaleY = scaleY; 9335 info.mMatrixDirty = true; 9336 invalidateViewProperty(false, true); 9337 if (mDisplayList != null) { 9338 mDisplayList.setScaleY(scaleY); 9339 } 9340 if ((mPrivateFlags2 & PFLAG2_VIEW_QUICK_REJECTED) == PFLAG2_VIEW_QUICK_REJECTED) { 9341 // View was rejected last time it was drawn by its parent; this may have changed 9342 invalidateParentIfNeeded(); 9343 } 9344 } 9345 } 9346 9347 /** 9348 * The x location of the point around which the view is {@link #setRotation(float) rotated} 9349 * and {@link #setScaleX(float) scaled}. 9350 * 9351 * @see #getRotation() 9352 * @see #getScaleX() 9353 * @see #getScaleY() 9354 * @see #getPivotY() 9355 * @return The x location of the pivot point. 9356 * 9357 * @attr ref android.R.styleable#View_transformPivotX 9358 */ 9359 @ViewDebug.ExportedProperty(category = "drawing") 9360 public float getPivotX() { 9361 return mTransformationInfo != null ? mTransformationInfo.mPivotX : 0; 9362 } 9363 9364 /** 9365 * Sets the x location of the point around which the view is 9366 * {@link #setRotation(float) rotated} and {@link #setScaleX(float) scaled}. 9367 * By default, the pivot point is centered on the object. 9368 * Setting this property disables this behavior and causes the view to use only the 9369 * explicitly set pivotX and pivotY values. 9370 * 9371 * @param pivotX The x location of the pivot point. 9372 * @see #getRotation() 9373 * @see #getScaleX() 9374 * @see #getScaleY() 9375 * @see #getPivotY() 9376 * 9377 * @attr ref android.R.styleable#View_transformPivotX 9378 */ 9379 public void setPivotX(float pivotX) { 9380 ensureTransformationInfo(); 9381 mPrivateFlags |= PFLAG_PIVOT_EXPLICITLY_SET; 9382 final TransformationInfo info = mTransformationInfo; 9383 if (info.mPivotX != pivotX) { 9384 invalidateViewProperty(true, false); 9385 info.mPivotX = pivotX; 9386 info.mMatrixDirty = true; 9387 invalidateViewProperty(false, true); 9388 if (mDisplayList != null) { 9389 mDisplayList.setPivotX(pivotX); 9390 } 9391 if ((mPrivateFlags2 & PFLAG2_VIEW_QUICK_REJECTED) == PFLAG2_VIEW_QUICK_REJECTED) { 9392 // View was rejected last time it was drawn by its parent; this may have changed 9393 invalidateParentIfNeeded(); 9394 } 9395 } 9396 } 9397 9398 /** 9399 * The y location of the point around which the view is {@link #setRotation(float) rotated} 9400 * and {@link #setScaleY(float) scaled}. 9401 * 9402 * @see #getRotation() 9403 * @see #getScaleX() 9404 * @see #getScaleY() 9405 * @see #getPivotY() 9406 * @return The y location of the pivot point. 9407 * 9408 * @attr ref android.R.styleable#View_transformPivotY 9409 */ 9410 @ViewDebug.ExportedProperty(category = "drawing") 9411 public float getPivotY() { 9412 return mTransformationInfo != null ? mTransformationInfo.mPivotY : 0; 9413 } 9414 9415 /** 9416 * Sets the y location of the point around which the view is {@link #setRotation(float) rotated} 9417 * and {@link #setScaleY(float) scaled}. By default, the pivot point is centered on the object. 9418 * Setting this property disables this behavior and causes the view to use only the 9419 * explicitly set pivotX and pivotY values. 9420 * 9421 * @param pivotY The y location of the pivot point. 9422 * @see #getRotation() 9423 * @see #getScaleX() 9424 * @see #getScaleY() 9425 * @see #getPivotY() 9426 * 9427 * @attr ref android.R.styleable#View_transformPivotY 9428 */ 9429 public void setPivotY(float pivotY) { 9430 ensureTransformationInfo(); 9431 mPrivateFlags |= PFLAG_PIVOT_EXPLICITLY_SET; 9432 final TransformationInfo info = mTransformationInfo; 9433 if (info.mPivotY != pivotY) { 9434 invalidateViewProperty(true, false); 9435 info.mPivotY = pivotY; 9436 info.mMatrixDirty = true; 9437 invalidateViewProperty(false, true); 9438 if (mDisplayList != null) { 9439 mDisplayList.setPivotY(pivotY); 9440 } 9441 if ((mPrivateFlags2 & PFLAG2_VIEW_QUICK_REJECTED) == PFLAG2_VIEW_QUICK_REJECTED) { 9442 // View was rejected last time it was drawn by its parent; this may have changed 9443 invalidateParentIfNeeded(); 9444 } 9445 } 9446 } 9447 9448 /** 9449 * The opacity of the view. This is a value from 0 to 1, where 0 means the view is 9450 * completely transparent and 1 means the view is completely opaque. 9451 * 9452 * <p>By default this is 1.0f. 9453 * @return The opacity of the view. 9454 */ 9455 @ViewDebug.ExportedProperty(category = "drawing") 9456 public float getAlpha() { 9457 return mTransformationInfo != null ? mTransformationInfo.mAlpha : 1; 9458 } 9459 9460 /** 9461 * Returns whether this View has content which overlaps. This function, intended to be 9462 * overridden by specific View types, is an optimization when alpha is set on a view. If 9463 * rendering overlaps in a view with alpha < 1, that view is drawn to an offscreen buffer 9464 * and then composited it into place, which can be expensive. If the view has no overlapping 9465 * rendering, the view can draw each primitive with the appropriate alpha value directly. 9466 * An example of overlapping rendering is a TextView with a background image, such as a 9467 * Button. An example of non-overlapping rendering is a TextView with no background, or 9468 * an ImageView with only the foreground image. The default implementation returns true; 9469 * subclasses should override if they have cases which can be optimized. 9470 * 9471 * @return true if the content in this view might overlap, false otherwise. 9472 */ 9473 public boolean hasOverlappingRendering() { 9474 return true; 9475 } 9476 9477 /** 9478 * <p>Sets the opacity of the view. This is a value from 0 to 1, where 0 means the view is 9479 * completely transparent and 1 means the view is completely opaque.</p> 9480 * 9481 * <p> Note that setting alpha to a translucent value (0 < alpha < 1) can have significant 9482 * performance implications, especially for large views. It is best to use the alpha property 9483 * sparingly and transiently, as in the case of fading animations.</p> 9484 * 9485 * <p>For a view with a frequently changing alpha, such as during a fading animation, it is 9486 * strongly recommended for performance reasons to either override 9487 * {@link #hasOverlappingRendering()} to return false if appropriate, or setting a 9488 * {@link #setLayerType(int, android.graphics.Paint) layer type} on the view.</p> 9489 * 9490 * <p>If this view overrides {@link #onSetAlpha(int)} to return true, then this view is 9491 * responsible for applying the opacity itself.</p> 9492 * 9493 * <p>Note that if the view is backed by a 9494 * {@link #setLayerType(int, android.graphics.Paint) layer} and is associated with a 9495 * {@link #setLayerPaint(android.graphics.Paint) layer paint}, setting an alpha value less than 9496 * 1.0 will supercede the alpha of the layer paint.</p> 9497 * 9498 * @param alpha The opacity of the view. 9499 * 9500 * @see #hasOverlappingRendering() 9501 * @see #setLayerType(int, android.graphics.Paint) 9502 * 9503 * @attr ref android.R.styleable#View_alpha 9504 */ 9505 public void setAlpha(float alpha) { 9506 ensureTransformationInfo(); 9507 if (mTransformationInfo.mAlpha != alpha) { 9508 mTransformationInfo.mAlpha = alpha; 9509 if (onSetAlpha((int) (alpha * 255))) { 9510 mPrivateFlags |= PFLAG_ALPHA_SET; 9511 // subclass is handling alpha - don't optimize rendering cache invalidation 9512 invalidateParentCaches(); 9513 invalidate(true); 9514 } else { 9515 mPrivateFlags &= ~PFLAG_ALPHA_SET; 9516 invalidateViewProperty(true, false); 9517 if (mDisplayList != null) { 9518 mDisplayList.setAlpha(alpha); 9519 } 9520 } 9521 } 9522 } 9523 9524 /** 9525 * Faster version of setAlpha() which performs the same steps except there are 9526 * no calls to invalidate(). The caller of this function should perform proper invalidation 9527 * on the parent and this object. The return value indicates whether the subclass handles 9528 * alpha (the return value for onSetAlpha()). 9529 * 9530 * @param alpha The new value for the alpha property 9531 * @return true if the View subclass handles alpha (the return value for onSetAlpha()) and 9532 * the new value for the alpha property is different from the old value 9533 */ 9534 boolean setAlphaNoInvalidation(float alpha) { 9535 ensureTransformationInfo(); 9536 if (mTransformationInfo.mAlpha != alpha) { 9537 mTransformationInfo.mAlpha = alpha; 9538 boolean subclassHandlesAlpha = onSetAlpha((int) (alpha * 255)); 9539 if (subclassHandlesAlpha) { 9540 mPrivateFlags |= PFLAG_ALPHA_SET; 9541 return true; 9542 } else { 9543 mPrivateFlags &= ~PFLAG_ALPHA_SET; 9544 if (mDisplayList != null) { 9545 mDisplayList.setAlpha(alpha); 9546 } 9547 } 9548 } 9549 return false; 9550 } 9551 9552 /** 9553 * Top position of this view relative to its parent. 9554 * 9555 * @return The top of this view, in pixels. 9556 */ 9557 @ViewDebug.CapturedViewProperty 9558 public final int getTop() { 9559 return mTop; 9560 } 9561 9562 /** 9563 * Sets the top position of this view relative to its parent. This method is meant to be called 9564 * by the layout system and should not generally be called otherwise, because the property 9565 * may be changed at any time by the layout. 9566 * 9567 * @param top The top of this view, in pixels. 9568 */ 9569 public final void setTop(int top) { 9570 if (top != mTop) { 9571 updateMatrix(); 9572 final boolean matrixIsIdentity = mTransformationInfo == null 9573 || mTransformationInfo.mMatrixIsIdentity; 9574 if (matrixIsIdentity) { 9575 if (mAttachInfo != null) { 9576 int minTop; 9577 int yLoc; 9578 if (top < mTop) { 9579 minTop = top; 9580 yLoc = top - mTop; 9581 } else { 9582 minTop = mTop; 9583 yLoc = 0; 9584 } 9585 invalidate(0, yLoc, mRight - mLeft, mBottom - minTop); 9586 } 9587 } else { 9588 // Double-invalidation is necessary to capture view's old and new areas 9589 invalidate(true); 9590 } 9591 9592 int width = mRight - mLeft; 9593 int oldHeight = mBottom - mTop; 9594 9595 mTop = top; 9596 if (mDisplayList != null) { 9597 mDisplayList.setTop(mTop); 9598 } 9599 9600 sizeChange(width, mBottom - mTop, width, oldHeight); 9601 9602 if (!matrixIsIdentity) { 9603 if ((mPrivateFlags & PFLAG_PIVOT_EXPLICITLY_SET) == 0) { 9604 // A change in dimension means an auto-centered pivot point changes, too 9605 mTransformationInfo.mMatrixDirty = true; 9606 } 9607 mPrivateFlags |= PFLAG_DRAWN; // force another invalidation with the new orientation 9608 invalidate(true); 9609 } 9610 mBackgroundSizeChanged = true; 9611 invalidateParentIfNeeded(); 9612 if ((mPrivateFlags2 & PFLAG2_VIEW_QUICK_REJECTED) == PFLAG2_VIEW_QUICK_REJECTED) { 9613 // View was rejected last time it was drawn by its parent; this may have changed 9614 invalidateParentIfNeeded(); 9615 } 9616 } 9617 } 9618 9619 /** 9620 * Bottom position of this view relative to its parent. 9621 * 9622 * @return The bottom of this view, in pixels. 9623 */ 9624 @ViewDebug.CapturedViewProperty 9625 public final int getBottom() { 9626 return mBottom; 9627 } 9628 9629 /** 9630 * True if this view has changed since the last time being drawn. 9631 * 9632 * @return The dirty state of this view. 9633 */ 9634 public boolean isDirty() { 9635 return (mPrivateFlags & PFLAG_DIRTY_MASK) != 0; 9636 } 9637 9638 /** 9639 * Sets the bottom position of this view relative to its parent. This method is meant to be 9640 * called by the layout system and should not generally be called otherwise, because the 9641 * property may be changed at any time by the layout. 9642 * 9643 * @param bottom The bottom of this view, in pixels. 9644 */ 9645 public final void setBottom(int bottom) { 9646 if (bottom != mBottom) { 9647 updateMatrix(); 9648 final boolean matrixIsIdentity = mTransformationInfo == null 9649 || mTransformationInfo.mMatrixIsIdentity; 9650 if (matrixIsIdentity) { 9651 if (mAttachInfo != null) { 9652 int maxBottom; 9653 if (bottom < mBottom) { 9654 maxBottom = mBottom; 9655 } else { 9656 maxBottom = bottom; 9657 } 9658 invalidate(0, 0, mRight - mLeft, maxBottom - mTop); 9659 } 9660 } else { 9661 // Double-invalidation is necessary to capture view's old and new areas 9662 invalidate(true); 9663 } 9664 9665 int width = mRight - mLeft; 9666 int oldHeight = mBottom - mTop; 9667 9668 mBottom = bottom; 9669 if (mDisplayList != null) { 9670 mDisplayList.setBottom(mBottom); 9671 } 9672 9673 sizeChange(width, mBottom - mTop, width, oldHeight); 9674 9675 if (!matrixIsIdentity) { 9676 if ((mPrivateFlags & PFLAG_PIVOT_EXPLICITLY_SET) == 0) { 9677 // A change in dimension means an auto-centered pivot point changes, too 9678 mTransformationInfo.mMatrixDirty = true; 9679 } 9680 mPrivateFlags |= PFLAG_DRAWN; // force another invalidation with the new orientation 9681 invalidate(true); 9682 } 9683 mBackgroundSizeChanged = true; 9684 invalidateParentIfNeeded(); 9685 if ((mPrivateFlags2 & PFLAG2_VIEW_QUICK_REJECTED) == PFLAG2_VIEW_QUICK_REJECTED) { 9686 // View was rejected last time it was drawn by its parent; this may have changed 9687 invalidateParentIfNeeded(); 9688 } 9689 } 9690 } 9691 9692 /** 9693 * Left position of this view relative to its parent. 9694 * 9695 * @return The left edge of this view, in pixels. 9696 */ 9697 @ViewDebug.CapturedViewProperty 9698 public final int getLeft() { 9699 return mLeft; 9700 } 9701 9702 /** 9703 * Sets the left position of this view relative to its parent. This method is meant to be called 9704 * by the layout system and should not generally be called otherwise, because the property 9705 * may be changed at any time by the layout. 9706 * 9707 * @param left The bottom of this view, in pixels. 9708 */ 9709 public final void setLeft(int left) { 9710 if (left != mLeft) { 9711 updateMatrix(); 9712 final boolean matrixIsIdentity = mTransformationInfo == null 9713 || mTransformationInfo.mMatrixIsIdentity; 9714 if (matrixIsIdentity) { 9715 if (mAttachInfo != null) { 9716 int minLeft; 9717 int xLoc; 9718 if (left < mLeft) { 9719 minLeft = left; 9720 xLoc = left - mLeft; 9721 } else { 9722 minLeft = mLeft; 9723 xLoc = 0; 9724 } 9725 invalidate(xLoc, 0, mRight - minLeft, mBottom - mTop); 9726 } 9727 } else { 9728 // Double-invalidation is necessary to capture view's old and new areas 9729 invalidate(true); 9730 } 9731 9732 int oldWidth = mRight - mLeft; 9733 int height = mBottom - mTop; 9734 9735 mLeft = left; 9736 if (mDisplayList != null) { 9737 mDisplayList.setLeft(left); 9738 } 9739 9740 sizeChange(mRight - mLeft, height, oldWidth, height); 9741 9742 if (!matrixIsIdentity) { 9743 if ((mPrivateFlags & PFLAG_PIVOT_EXPLICITLY_SET) == 0) { 9744 // A change in dimension means an auto-centered pivot point changes, too 9745 mTransformationInfo.mMatrixDirty = true; 9746 } 9747 mPrivateFlags |= PFLAG_DRAWN; // force another invalidation with the new orientation 9748 invalidate(true); 9749 } 9750 mBackgroundSizeChanged = true; 9751 invalidateParentIfNeeded(); 9752 if ((mPrivateFlags2 & PFLAG2_VIEW_QUICK_REJECTED) == PFLAG2_VIEW_QUICK_REJECTED) { 9753 // View was rejected last time it was drawn by its parent; this may have changed 9754 invalidateParentIfNeeded(); 9755 } 9756 } 9757 } 9758 9759 /** 9760 * Right position of this view relative to its parent. 9761 * 9762 * @return The right edge of this view, in pixels. 9763 */ 9764 @ViewDebug.CapturedViewProperty 9765 public final int getRight() { 9766 return mRight; 9767 } 9768 9769 /** 9770 * Sets the right position of this view relative to its parent. This method is meant to be called 9771 * by the layout system and should not generally be called otherwise, because the property 9772 * may be changed at any time by the layout. 9773 * 9774 * @param right The bottom of this view, in pixels. 9775 */ 9776 public final void setRight(int right) { 9777 if (right != mRight) { 9778 updateMatrix(); 9779 final boolean matrixIsIdentity = mTransformationInfo == null 9780 || mTransformationInfo.mMatrixIsIdentity; 9781 if (matrixIsIdentity) { 9782 if (mAttachInfo != null) { 9783 int maxRight; 9784 if (right < mRight) { 9785 maxRight = mRight; 9786 } else { 9787 maxRight = right; 9788 } 9789 invalidate(0, 0, maxRight - mLeft, mBottom - mTop); 9790 } 9791 } else { 9792 // Double-invalidation is necessary to capture view's old and new areas 9793 invalidate(true); 9794 } 9795 9796 int oldWidth = mRight - mLeft; 9797 int height = mBottom - mTop; 9798 9799 mRight = right; 9800 if (mDisplayList != null) { 9801 mDisplayList.setRight(mRight); 9802 } 9803 9804 sizeChange(mRight - mLeft, height, oldWidth, height); 9805 9806 if (!matrixIsIdentity) { 9807 if ((mPrivateFlags & PFLAG_PIVOT_EXPLICITLY_SET) == 0) { 9808 // A change in dimension means an auto-centered pivot point changes, too 9809 mTransformationInfo.mMatrixDirty = true; 9810 } 9811 mPrivateFlags |= PFLAG_DRAWN; // force another invalidation with the new orientation 9812 invalidate(true); 9813 } 9814 mBackgroundSizeChanged = true; 9815 invalidateParentIfNeeded(); 9816 if ((mPrivateFlags2 & PFLAG2_VIEW_QUICK_REJECTED) == PFLAG2_VIEW_QUICK_REJECTED) { 9817 // View was rejected last time it was drawn by its parent; this may have changed 9818 invalidateParentIfNeeded(); 9819 } 9820 } 9821 } 9822 9823 /** 9824 * The visual x position of this view, in pixels. This is equivalent to the 9825 * {@link #setTranslationX(float) translationX} property plus the current 9826 * {@link #getLeft() left} property. 9827 * 9828 * @return The visual x position of this view, in pixels. 9829 */ 9830 @ViewDebug.ExportedProperty(category = "drawing") 9831 public float getX() { 9832 return mLeft + (mTransformationInfo != null ? mTransformationInfo.mTranslationX : 0); 9833 } 9834 9835 /** 9836 * Sets the visual x position of this view, in pixels. This is equivalent to setting the 9837 * {@link #setTranslationX(float) translationX} property to be the difference between 9838 * the x value passed in and the current {@link #getLeft() left} property. 9839 * 9840 * @param x The visual x position of this view, in pixels. 9841 */ 9842 public void setX(float x) { 9843 setTranslationX(x - mLeft); 9844 } 9845 9846 /** 9847 * The visual y position of this view, in pixels. This is equivalent to the 9848 * {@link #setTranslationY(float) translationY} property plus the current 9849 * {@link #getTop() top} property. 9850 * 9851 * @return The visual y position of this view, in pixels. 9852 */ 9853 @ViewDebug.ExportedProperty(category = "drawing") 9854 public float getY() { 9855 return mTop + (mTransformationInfo != null ? mTransformationInfo.mTranslationY : 0); 9856 } 9857 9858 /** 9859 * Sets the visual y position of this view, in pixels. This is equivalent to setting the 9860 * {@link #setTranslationY(float) translationY} property to be the difference between 9861 * the y value passed in and the current {@link #getTop() top} property. 9862 * 9863 * @param y The visual y position of this view, in pixels. 9864 */ 9865 public void setY(float y) { 9866 setTranslationY(y - mTop); 9867 } 9868 9869 9870 /** 9871 * The horizontal location of this view relative to its {@link #getLeft() left} position. 9872 * This position is post-layout, in addition to wherever the object's 9873 * layout placed it. 9874 * 9875 * @return The horizontal position of this view relative to its left position, in pixels. 9876 */ 9877 @ViewDebug.ExportedProperty(category = "drawing") 9878 public float getTranslationX() { 9879 return mTransformationInfo != null ? mTransformationInfo.mTranslationX : 0; 9880 } 9881 9882 /** 9883 * Sets the horizontal location of this view relative to its {@link #getLeft() left} position. 9884 * This effectively positions the object post-layout, in addition to wherever the object's 9885 * layout placed it. 9886 * 9887 * @param translationX The horizontal position of this view relative to its left position, 9888 * in pixels. 9889 * 9890 * @attr ref android.R.styleable#View_translationX 9891 */ 9892 public void setTranslationX(float translationX) { 9893 ensureTransformationInfo(); 9894 final TransformationInfo info = mTransformationInfo; 9895 if (info.mTranslationX != translationX) { 9896 // Double-invalidation is necessary to capture view's old and new areas 9897 invalidateViewProperty(true, false); 9898 info.mTranslationX = translationX; 9899 info.mMatrixDirty = true; 9900 invalidateViewProperty(false, true); 9901 if (mDisplayList != null) { 9902 mDisplayList.setTranslationX(translationX); 9903 } 9904 if ((mPrivateFlags2 & PFLAG2_VIEW_QUICK_REJECTED) == PFLAG2_VIEW_QUICK_REJECTED) { 9905 // View was rejected last time it was drawn by its parent; this may have changed 9906 invalidateParentIfNeeded(); 9907 } 9908 } 9909 } 9910 9911 /** 9912 * The horizontal location of this view relative to its {@link #getTop() top} position. 9913 * This position is post-layout, in addition to wherever the object's 9914 * layout placed it. 9915 * 9916 * @return The vertical position of this view relative to its top position, 9917 * in pixels. 9918 */ 9919 @ViewDebug.ExportedProperty(category = "drawing") 9920 public float getTranslationY() { 9921 return mTransformationInfo != null ? mTransformationInfo.mTranslationY : 0; 9922 } 9923 9924 /** 9925 * Sets the vertical location of this view relative to its {@link #getTop() top} position. 9926 * This effectively positions the object post-layout, in addition to wherever the object's 9927 * layout placed it. 9928 * 9929 * @param translationY The vertical position of this view relative to its top position, 9930 * in pixels. 9931 * 9932 * @attr ref android.R.styleable#View_translationY 9933 */ 9934 public void setTranslationY(float translationY) { 9935 ensureTransformationInfo(); 9936 final TransformationInfo info = mTransformationInfo; 9937 if (info.mTranslationY != translationY) { 9938 invalidateViewProperty(true, false); 9939 info.mTranslationY = translationY; 9940 info.mMatrixDirty = true; 9941 invalidateViewProperty(false, true); 9942 if (mDisplayList != null) { 9943 mDisplayList.setTranslationY(translationY); 9944 } 9945 if ((mPrivateFlags2 & PFLAG2_VIEW_QUICK_REJECTED) == PFLAG2_VIEW_QUICK_REJECTED) { 9946 // View was rejected last time it was drawn by its parent; this may have changed 9947 invalidateParentIfNeeded(); 9948 } 9949 } 9950 } 9951 9952 /** 9953 * Hit rectangle in parent's coordinates 9954 * 9955 * @param outRect The hit rectangle of the view. 9956 */ 9957 public void getHitRect(Rect outRect) { 9958 updateMatrix(); 9959 final TransformationInfo info = mTransformationInfo; 9960 if (info == null || info.mMatrixIsIdentity || mAttachInfo == null) { 9961 outRect.set(mLeft, mTop, mRight, mBottom); 9962 } else { 9963 final RectF tmpRect = mAttachInfo.mTmpTransformRect; 9964 tmpRect.set(0, 0, getWidth(), getHeight()); 9965 info.mMatrix.mapRect(tmpRect); 9966 outRect.set((int) tmpRect.left + mLeft, (int) tmpRect.top + mTop, 9967 (int) tmpRect.right + mLeft, (int) tmpRect.bottom + mTop); 9968 } 9969 } 9970 9971 /** 9972 * Determines whether the given point, in local coordinates is inside the view. 9973 */ 9974 /*package*/ final boolean pointInView(float localX, float localY) { 9975 return localX >= 0 && localX < (mRight - mLeft) 9976 && localY >= 0 && localY < (mBottom - mTop); 9977 } 9978 9979 /** 9980 * Utility method to determine whether the given point, in local coordinates, 9981 * is inside the view, where the area of the view is expanded by the slop factor. 9982 * This method is called while processing touch-move events to determine if the event 9983 * is still within the view. 9984 */ 9985 private boolean pointInView(float localX, float localY, float slop) { 9986 return localX >= -slop && localY >= -slop && localX < ((mRight - mLeft) + slop) && 9987 localY < ((mBottom - mTop) + slop); 9988 } 9989 9990 /** 9991 * When a view has focus and the user navigates away from it, the next view is searched for 9992 * starting from the rectangle filled in by this method. 9993 * 9994 * By default, the rectangle is the {@link #getDrawingRect(android.graphics.Rect)}) 9995 * of the view. However, if your view maintains some idea of internal selection, 9996 * such as a cursor, or a selected row or column, you should override this method and 9997 * fill in a more specific rectangle. 9998 * 9999 * @param r The rectangle to fill in, in this view's coordinates. 10000 */ 10001 public void getFocusedRect(Rect r) { 10002 getDrawingRect(r); 10003 } 10004 10005 /** 10006 * If some part of this view is not clipped by any of its parents, then 10007 * return that area in r in global (root) coordinates. To convert r to local 10008 * coordinates (without taking possible View rotations into account), offset 10009 * it by -globalOffset (e.g. r.offset(-globalOffset.x, -globalOffset.y)). 10010 * If the view is completely clipped or translated out, return false. 10011 * 10012 * @param r If true is returned, r holds the global coordinates of the 10013 * visible portion of this view. 10014 * @param globalOffset If true is returned, globalOffset holds the dx,dy 10015 * between this view and its root. globalOffet may be null. 10016 * @return true if r is non-empty (i.e. part of the view is visible at the 10017 * root level. 10018 */ 10019 public boolean getGlobalVisibleRect(Rect r, Point globalOffset) { 10020 int width = mRight - mLeft; 10021 int height = mBottom - mTop; 10022 if (width > 0 && height > 0) { 10023 r.set(0, 0, width, height); 10024 if (globalOffset != null) { 10025 globalOffset.set(-mScrollX, -mScrollY); 10026 } 10027 return mParent == null || mParent.getChildVisibleRect(this, r, globalOffset); 10028 } 10029 return false; 10030 } 10031 10032 public final boolean getGlobalVisibleRect(Rect r) { 10033 return getGlobalVisibleRect(r, null); 10034 } 10035 10036 public final boolean getLocalVisibleRect(Rect r) { 10037 final Point offset = mAttachInfo != null ? mAttachInfo.mPoint : new Point(); 10038 if (getGlobalVisibleRect(r, offset)) { 10039 r.offset(-offset.x, -offset.y); // make r local 10040 return true; 10041 } 10042 return false; 10043 } 10044 10045 /** 10046 * Offset this view's vertical location by the specified number of pixels. 10047 * 10048 * @param offset the number of pixels to offset the view by 10049 */ 10050 public void offsetTopAndBottom(int offset) { 10051 if (offset != 0) { 10052 updateMatrix(); 10053 final boolean matrixIsIdentity = mTransformationInfo == null 10054 || mTransformationInfo.mMatrixIsIdentity; 10055 if (matrixIsIdentity) { 10056 if (mDisplayList != null) { 10057 invalidateViewProperty(false, false); 10058 } else { 10059 final ViewParent p = mParent; 10060 if (p != null && mAttachInfo != null) { 10061 final Rect r = mAttachInfo.mTmpInvalRect; 10062 int minTop; 10063 int maxBottom; 10064 int yLoc; 10065 if (offset < 0) { 10066 minTop = mTop + offset; 10067 maxBottom = mBottom; 10068 yLoc = offset; 10069 } else { 10070 minTop = mTop; 10071 maxBottom = mBottom + offset; 10072 yLoc = 0; 10073 } 10074 r.set(0, yLoc, mRight - mLeft, maxBottom - minTop); 10075 p.invalidateChild(this, r); 10076 } 10077 } 10078 } else { 10079 invalidateViewProperty(false, false); 10080 } 10081 10082 mTop += offset; 10083 mBottom += offset; 10084 if (mDisplayList != null) { 10085 mDisplayList.offsetTopAndBottom(offset); 10086 invalidateViewProperty(false, false); 10087 } else { 10088 if (!matrixIsIdentity) { 10089 invalidateViewProperty(false, true); 10090 } 10091 invalidateParentIfNeeded(); 10092 } 10093 } 10094 } 10095 10096 /** 10097 * Offset this view's horizontal location by the specified amount of pixels. 10098 * 10099 * @param offset the number of pixels to offset the view by 10100 */ 10101 public void offsetLeftAndRight(int offset) { 10102 if (offset != 0) { 10103 updateMatrix(); 10104 final boolean matrixIsIdentity = mTransformationInfo == null 10105 || mTransformationInfo.mMatrixIsIdentity; 10106 if (matrixIsIdentity) { 10107 if (mDisplayList != null) { 10108 invalidateViewProperty(false, false); 10109 } else { 10110 final ViewParent p = mParent; 10111 if (p != null && mAttachInfo != null) { 10112 final Rect r = mAttachInfo.mTmpInvalRect; 10113 int minLeft; 10114 int maxRight; 10115 if (offset < 0) { 10116 minLeft = mLeft + offset; 10117 maxRight = mRight; 10118 } else { 10119 minLeft = mLeft; 10120 maxRight = mRight + offset; 10121 } 10122 r.set(0, 0, maxRight - minLeft, mBottom - mTop); 10123 p.invalidateChild(this, r); 10124 } 10125 } 10126 } else { 10127 invalidateViewProperty(false, false); 10128 } 10129 10130 mLeft += offset; 10131 mRight += offset; 10132 if (mDisplayList != null) { 10133 mDisplayList.offsetLeftAndRight(offset); 10134 invalidateViewProperty(false, false); 10135 } else { 10136 if (!matrixIsIdentity) { 10137 invalidateViewProperty(false, true); 10138 } 10139 invalidateParentIfNeeded(); 10140 } 10141 } 10142 } 10143 10144 /** 10145 * Get the LayoutParams associated with this view. All views should have 10146 * layout parameters. These supply parameters to the <i>parent</i> of this 10147 * view specifying how it should be arranged. There are many subclasses of 10148 * ViewGroup.LayoutParams, and these correspond to the different subclasses 10149 * of ViewGroup that are responsible for arranging their children. 10150 * 10151 * This method may return null if this View is not attached to a parent 10152 * ViewGroup or {@link #setLayoutParams(android.view.ViewGroup.LayoutParams)} 10153 * was not invoked successfully. When a View is attached to a parent 10154 * ViewGroup, this method must not return null. 10155 * 10156 * @return The LayoutParams associated with this view, or null if no 10157 * parameters have been set yet 10158 */ 10159 @ViewDebug.ExportedProperty(deepExport = true, prefix = "layout_") 10160 public ViewGroup.LayoutParams getLayoutParams() { 10161 return mLayoutParams; 10162 } 10163 10164 /** 10165 * Set the layout parameters associated with this view. These supply 10166 * parameters to the <i>parent</i> of this view specifying how it should be 10167 * arranged. There are many subclasses of ViewGroup.LayoutParams, and these 10168 * correspond to the different subclasses of ViewGroup that are responsible 10169 * for arranging their children. 10170 * 10171 * @param params The layout parameters for this view, cannot be null 10172 */ 10173 public void setLayoutParams(ViewGroup.LayoutParams params) { 10174 if (params == null) { 10175 throw new NullPointerException("Layout parameters cannot be null"); 10176 } 10177 mLayoutParams = params; 10178 resolveLayoutParams(); 10179 if (mParent instanceof ViewGroup) { 10180 ((ViewGroup) mParent).onSetLayoutParams(this, params); 10181 } 10182 requestLayout(); 10183 } 10184 10185 /** 10186 * Resolve the layout parameters depending on the resolved layout direction 10187 * 10188 * @hide 10189 */ 10190 public void resolveLayoutParams() { 10191 if (mLayoutParams != null) { 10192 mLayoutParams.resolveLayoutDirection(getLayoutDirection()); 10193 } 10194 } 10195 10196 /** 10197 * Set the scrolled position of your view. This will cause a call to 10198 * {@link #onScrollChanged(int, int, int, int)} and the view will be 10199 * invalidated. 10200 * @param x the x position to scroll to 10201 * @param y the y position to scroll to 10202 */ 10203 public void scrollTo(int x, int y) { 10204 if (mScrollX != x || mScrollY != y) { 10205 int oldX = mScrollX; 10206 int oldY = mScrollY; 10207 mScrollX = x; 10208 mScrollY = y; 10209 invalidateParentCaches(); 10210 onScrollChanged(mScrollX, mScrollY, oldX, oldY); 10211 if (!awakenScrollBars()) { 10212 postInvalidateOnAnimation(); 10213 } 10214 } 10215 } 10216 10217 /** 10218 * Move the scrolled position of your view. This will cause a call to 10219 * {@link #onScrollChanged(int, int, int, int)} and the view will be 10220 * invalidated. 10221 * @param x the amount of pixels to scroll by horizontally 10222 * @param y the amount of pixels to scroll by vertically 10223 */ 10224 public void scrollBy(int x, int y) { 10225 scrollTo(mScrollX + x, mScrollY + y); 10226 } 10227 10228 /** 10229 * <p>Trigger the scrollbars to draw. When invoked this method starts an 10230 * animation to fade the scrollbars out after a default delay. If a subclass 10231 * provides animated scrolling, the start delay should equal the duration 10232 * of the scrolling animation.</p> 10233 * 10234 * <p>The animation starts only if at least one of the scrollbars is 10235 * enabled, as specified by {@link #isHorizontalScrollBarEnabled()} and 10236 * {@link #isVerticalScrollBarEnabled()}. When the animation is started, 10237 * this method returns true, and false otherwise. If the animation is 10238 * started, this method calls {@link #invalidate()}; in that case the 10239 * caller should not call {@link #invalidate()}.</p> 10240 * 10241 * <p>This method should be invoked every time a subclass directly updates 10242 * the scroll parameters.</p> 10243 * 10244 * <p>This method is automatically invoked by {@link #scrollBy(int, int)} 10245 * and {@link #scrollTo(int, int)}.</p> 10246 * 10247 * @return true if the animation is played, false otherwise 10248 * 10249 * @see #awakenScrollBars(int) 10250 * @see #scrollBy(int, int) 10251 * @see #scrollTo(int, int) 10252 * @see #isHorizontalScrollBarEnabled() 10253 * @see #isVerticalScrollBarEnabled() 10254 * @see #setHorizontalScrollBarEnabled(boolean) 10255 * @see #setVerticalScrollBarEnabled(boolean) 10256 */ 10257 protected boolean awakenScrollBars() { 10258 return mScrollCache != null && 10259 awakenScrollBars(mScrollCache.scrollBarDefaultDelayBeforeFade, true); 10260 } 10261 10262 /** 10263 * Trigger the scrollbars to draw. 10264 * This method differs from awakenScrollBars() only in its default duration. 10265 * initialAwakenScrollBars() will show the scroll bars for longer than 10266 * usual to give the user more of a chance to notice them. 10267 * 10268 * @return true if the animation is played, false otherwise. 10269 */ 10270 private boolean initialAwakenScrollBars() { 10271 return mScrollCache != null && 10272 awakenScrollBars(mScrollCache.scrollBarDefaultDelayBeforeFade * 4, true); 10273 } 10274 10275 /** 10276 * <p> 10277 * Trigger the scrollbars to draw. When invoked this method starts an 10278 * animation to fade the scrollbars out after a fixed delay. If a subclass 10279 * provides animated scrolling, the start delay should equal the duration of 10280 * the scrolling animation. 10281 * </p> 10282 * 10283 * <p> 10284 * The animation starts only if at least one of the scrollbars is enabled, 10285 * as specified by {@link #isHorizontalScrollBarEnabled()} and 10286 * {@link #isVerticalScrollBarEnabled()}. When the animation is started, 10287 * this method returns true, and false otherwise. If the animation is 10288 * started, this method calls {@link #invalidate()}; in that case the caller 10289 * should not call {@link #invalidate()}. 10290 * </p> 10291 * 10292 * <p> 10293 * This method should be invoked everytime a subclass directly updates the 10294 * scroll parameters. 10295 * </p> 10296 * 10297 * @param startDelay the delay, in milliseconds, after which the animation 10298 * should start; when the delay is 0, the animation starts 10299 * immediately 10300 * @return true if the animation is played, false otherwise 10301 * 10302 * @see #scrollBy(int, int) 10303 * @see #scrollTo(int, int) 10304 * @see #isHorizontalScrollBarEnabled() 10305 * @see #isVerticalScrollBarEnabled() 10306 * @see #setHorizontalScrollBarEnabled(boolean) 10307 * @see #setVerticalScrollBarEnabled(boolean) 10308 */ 10309 protected boolean awakenScrollBars(int startDelay) { 10310 return awakenScrollBars(startDelay, true); 10311 } 10312 10313 /** 10314 * <p> 10315 * Trigger the scrollbars to draw. When invoked this method starts an 10316 * animation to fade the scrollbars out after a fixed delay. If a subclass 10317 * provides animated scrolling, the start delay should equal the duration of 10318 * the scrolling animation. 10319 * </p> 10320 * 10321 * <p> 10322 * The animation starts only if at least one of the scrollbars is enabled, 10323 * as specified by {@link #isHorizontalScrollBarEnabled()} and 10324 * {@link #isVerticalScrollBarEnabled()}. When the animation is started, 10325 * this method returns true, and false otherwise. If the animation is 10326 * started, this method calls {@link #invalidate()} if the invalidate parameter 10327 * is set to true; in that case the caller 10328 * should not call {@link #invalidate()}. 10329 * </p> 10330 * 10331 * <p> 10332 * This method should be invoked everytime a subclass directly updates the 10333 * scroll parameters. 10334 * </p> 10335 * 10336 * @param startDelay the delay, in milliseconds, after which the animation 10337 * should start; when the delay is 0, the animation starts 10338 * immediately 10339 * 10340 * @param invalidate Wheter this method should call invalidate 10341 * 10342 * @return true if the animation is played, false otherwise 10343 * 10344 * @see #scrollBy(int, int) 10345 * @see #scrollTo(int, int) 10346 * @see #isHorizontalScrollBarEnabled() 10347 * @see #isVerticalScrollBarEnabled() 10348 * @see #setHorizontalScrollBarEnabled(boolean) 10349 * @see #setVerticalScrollBarEnabled(boolean) 10350 */ 10351 protected boolean awakenScrollBars(int startDelay, boolean invalidate) { 10352 final ScrollabilityCache scrollCache = mScrollCache; 10353 10354 if (scrollCache == null || !scrollCache.fadeScrollBars) { 10355 return false; 10356 } 10357 10358 if (scrollCache.scrollBar == null) { 10359 scrollCache.scrollBar = new ScrollBarDrawable(); 10360 } 10361 10362 if (isHorizontalScrollBarEnabled() || isVerticalScrollBarEnabled()) { 10363 10364 if (invalidate) { 10365 // Invalidate to show the scrollbars 10366 postInvalidateOnAnimation(); 10367 } 10368 10369 if (scrollCache.state == ScrollabilityCache.OFF) { 10370 // FIXME: this is copied from WindowManagerService. 10371 // We should get this value from the system when it 10372 // is possible to do so. 10373 final int KEY_REPEAT_FIRST_DELAY = 750; 10374 startDelay = Math.max(KEY_REPEAT_FIRST_DELAY, startDelay); 10375 } 10376 10377 // Tell mScrollCache when we should start fading. This may 10378 // extend the fade start time if one was already scheduled 10379 long fadeStartTime = AnimationUtils.currentAnimationTimeMillis() + startDelay; 10380 scrollCache.fadeStartTime = fadeStartTime; 10381 scrollCache.state = ScrollabilityCache.ON; 10382 10383 // Schedule our fader to run, unscheduling any old ones first 10384 if (mAttachInfo != null) { 10385 mAttachInfo.mHandler.removeCallbacks(scrollCache); 10386 mAttachInfo.mHandler.postAtTime(scrollCache, fadeStartTime); 10387 } 10388 10389 return true; 10390 } 10391 10392 return false; 10393 } 10394 10395 /** 10396 * Do not invalidate views which are not visible and which are not running an animation. They 10397 * will not get drawn and they should not set dirty flags as if they will be drawn 10398 */ 10399 private boolean skipInvalidate() { 10400 return (mViewFlags & VISIBILITY_MASK) != VISIBLE && mCurrentAnimation == null && 10401 (!(mParent instanceof ViewGroup) || 10402 !((ViewGroup) mParent).isViewTransitioning(this)); 10403 } 10404 /** 10405 * Mark the area defined by dirty as needing to be drawn. If the view is 10406 * visible, {@link #onDraw(android.graphics.Canvas)} will be called at some point 10407 * in the future. This must be called from a UI thread. To call from a non-UI 10408 * thread, call {@link #postInvalidate()}. 10409 * 10410 * WARNING: This method is destructive to dirty. 10411 * @param dirty the rectangle representing the bounds of the dirty region 10412 */ 10413 public void invalidate(Rect dirty) { 10414 if (skipInvalidate()) { 10415 return; 10416 } 10417 if ((mPrivateFlags & (PFLAG_DRAWN | PFLAG_HAS_BOUNDS)) == (PFLAG_DRAWN | PFLAG_HAS_BOUNDS) || 10418 (mPrivateFlags & PFLAG_DRAWING_CACHE_VALID) == PFLAG_DRAWING_CACHE_VALID || 10419 (mPrivateFlags & PFLAG_INVALIDATED) != PFLAG_INVALIDATED) { 10420 mPrivateFlags &= ~PFLAG_DRAWING_CACHE_VALID; 10421 mPrivateFlags |= PFLAG_INVALIDATED; 10422 mPrivateFlags |= PFLAG_DIRTY; 10423 final ViewParent p = mParent; 10424 final AttachInfo ai = mAttachInfo; 10425 //noinspection PointlessBooleanExpression,ConstantConditions 10426 if (!HardwareRenderer.RENDER_DIRTY_REGIONS) { 10427 if (p != null && ai != null && ai.mHardwareAccelerated) { 10428 // fast-track for GL-enabled applications; just invalidate the whole hierarchy 10429 // with a null dirty rect, which tells the ViewAncestor to redraw everything 10430 p.invalidateChild(this, null); 10431 return; 10432 } 10433 } 10434 if (p != null && ai != null) { 10435 final int scrollX = mScrollX; 10436 final int scrollY = mScrollY; 10437 final Rect r = ai.mTmpInvalRect; 10438 r.set(dirty.left - scrollX, dirty.top - scrollY, 10439 dirty.right - scrollX, dirty.bottom - scrollY); 10440 mParent.invalidateChild(this, r); 10441 } 10442 } 10443 } 10444 10445 /** 10446 * Mark the area defined by the rect (l,t,r,b) as needing to be drawn. 10447 * The coordinates of the dirty rect are relative to the view. 10448 * If the view is visible, {@link #onDraw(android.graphics.Canvas)} 10449 * will be called at some point in the future. This must be called from 10450 * a UI thread. To call from a non-UI thread, call {@link #postInvalidate()}. 10451 * @param l the left position of the dirty region 10452 * @param t the top position of the dirty region 10453 * @param r the right position of the dirty region 10454 * @param b the bottom position of the dirty region 10455 */ 10456 public void invalidate(int l, int t, int r, int b) { 10457 if (skipInvalidate()) { 10458 return; 10459 } 10460 if ((mPrivateFlags & (PFLAG_DRAWN | PFLAG_HAS_BOUNDS)) == (PFLAG_DRAWN | PFLAG_HAS_BOUNDS) || 10461 (mPrivateFlags & PFLAG_DRAWING_CACHE_VALID) == PFLAG_DRAWING_CACHE_VALID || 10462 (mPrivateFlags & PFLAG_INVALIDATED) != PFLAG_INVALIDATED) { 10463 mPrivateFlags &= ~PFLAG_DRAWING_CACHE_VALID; 10464 mPrivateFlags |= PFLAG_INVALIDATED; 10465 mPrivateFlags |= PFLAG_DIRTY; 10466 final ViewParent p = mParent; 10467 final AttachInfo ai = mAttachInfo; 10468 //noinspection PointlessBooleanExpression,ConstantConditions 10469 if (!HardwareRenderer.RENDER_DIRTY_REGIONS) { 10470 if (p != null && ai != null && ai.mHardwareAccelerated) { 10471 // fast-track for GL-enabled applications; just invalidate the whole hierarchy 10472 // with a null dirty rect, which tells the ViewAncestor to redraw everything 10473 p.invalidateChild(this, null); 10474 return; 10475 } 10476 } 10477 if (p != null && ai != null && l < r && t < b) { 10478 final int scrollX = mScrollX; 10479 final int scrollY = mScrollY; 10480 final Rect tmpr = ai.mTmpInvalRect; 10481 tmpr.set(l - scrollX, t - scrollY, r - scrollX, b - scrollY); 10482 p.invalidateChild(this, tmpr); 10483 } 10484 } 10485 } 10486 10487 /** 10488 * Invalidate the whole view. If the view is visible, 10489 * {@link #onDraw(android.graphics.Canvas)} will be called at some point in 10490 * the future. This must be called from a UI thread. To call from a non-UI thread, 10491 * call {@link #postInvalidate()}. 10492 */ 10493 public void invalidate() { 10494 invalidate(true); 10495 } 10496 10497 /** 10498 * This is where the invalidate() work actually happens. A full invalidate() 10499 * causes the drawing cache to be invalidated, but this function can be called with 10500 * invalidateCache set to false to skip that invalidation step for cases that do not 10501 * need it (for example, a component that remains at the same dimensions with the same 10502 * content). 10503 * 10504 * @param invalidateCache Whether the drawing cache for this view should be invalidated as 10505 * well. This is usually true for a full invalidate, but may be set to false if the 10506 * View's contents or dimensions have not changed. 10507 */ 10508 void invalidate(boolean invalidateCache) { 10509 if (skipInvalidate()) { 10510 return; 10511 } 10512 if ((mPrivateFlags & (PFLAG_DRAWN | PFLAG_HAS_BOUNDS)) == (PFLAG_DRAWN | PFLAG_HAS_BOUNDS) || 10513 (invalidateCache && (mPrivateFlags & PFLAG_DRAWING_CACHE_VALID) == PFLAG_DRAWING_CACHE_VALID) || 10514 (mPrivateFlags & PFLAG_INVALIDATED) != PFLAG_INVALIDATED || isOpaque() != mLastIsOpaque) { 10515 mLastIsOpaque = isOpaque(); 10516 mPrivateFlags &= ~PFLAG_DRAWN; 10517 mPrivateFlags |= PFLAG_DIRTY; 10518 if (invalidateCache) { 10519 mPrivateFlags |= PFLAG_INVALIDATED; 10520 mPrivateFlags &= ~PFLAG_DRAWING_CACHE_VALID; 10521 } 10522 final AttachInfo ai = mAttachInfo; 10523 final ViewParent p = mParent; 10524 //noinspection PointlessBooleanExpression,ConstantConditions 10525 if (!HardwareRenderer.RENDER_DIRTY_REGIONS) { 10526 if (p != null && ai != null && ai.mHardwareAccelerated) { 10527 // fast-track for GL-enabled applications; just invalidate the whole hierarchy 10528 // with a null dirty rect, which tells the ViewAncestor to redraw everything 10529 p.invalidateChild(this, null); 10530 return; 10531 } 10532 } 10533 10534 if (p != null && ai != null) { 10535 final Rect r = ai.mTmpInvalRect; 10536 r.set(0, 0, mRight - mLeft, mBottom - mTop); 10537 // Don't call invalidate -- we don't want to internally scroll 10538 // our own bounds 10539 p.invalidateChild(this, r); 10540 } 10541 } 10542 } 10543 10544 /** 10545 * Quick invalidation for View property changes (alpha, translationXY, etc.). We don't want to 10546 * set any flags or handle all of the cases handled by the default invalidation methods. 10547 * Instead, we just want to schedule a traversal in ViewRootImpl with the appropriate 10548 * dirty rect. This method calls into fast invalidation methods in ViewGroup that 10549 * walk up the hierarchy, transforming the dirty rect as necessary. 10550 * 10551 * The method also handles normal invalidation logic if display list properties are not 10552 * being used in this view. The invalidateParent and forceRedraw flags are used by that 10553 * backup approach, to handle these cases used in the various property-setting methods. 10554 * 10555 * @param invalidateParent Force a call to invalidateParentCaches() if display list properties 10556 * are not being used in this view 10557 * @param forceRedraw Mark the view as DRAWN to force the invalidation to propagate, if display 10558 * list properties are not being used in this view 10559 */ 10560 void invalidateViewProperty(boolean invalidateParent, boolean forceRedraw) { 10561 if (mDisplayList == null || (mPrivateFlags & PFLAG_DRAW_ANIMATION) == PFLAG_DRAW_ANIMATION) { 10562 if (invalidateParent) { 10563 invalidateParentCaches(); 10564 } 10565 if (forceRedraw) { 10566 mPrivateFlags |= PFLAG_DRAWN; // force another invalidation with the new orientation 10567 } 10568 invalidate(false); 10569 } else { 10570 final AttachInfo ai = mAttachInfo; 10571 final ViewParent p = mParent; 10572 if (p != null && ai != null) { 10573 final Rect r = ai.mTmpInvalRect; 10574 r.set(0, 0, mRight - mLeft, mBottom - mTop); 10575 if (mParent instanceof ViewGroup) { 10576 ((ViewGroup) mParent).invalidateChildFast(this, r); 10577 } else { 10578 mParent.invalidateChild(this, r); 10579 } 10580 } 10581 } 10582 } 10583 10584 /** 10585 * Utility method to transform a given Rect by the current matrix of this view. 10586 */ 10587 void transformRect(final Rect rect) { 10588 if (!getMatrix().isIdentity()) { 10589 RectF boundingRect = mAttachInfo.mTmpTransformRect; 10590 boundingRect.set(rect); 10591 getMatrix().mapRect(boundingRect); 10592 rect.set((int) Math.floor(boundingRect.left), 10593 (int) Math.floor(boundingRect.top), 10594 (int) Math.ceil(boundingRect.right), 10595 (int) Math.ceil(boundingRect.bottom)); 10596 } 10597 } 10598 10599 /** 10600 * Used to indicate that the parent of this view should clear its caches. This functionality 10601 * is used to force the parent to rebuild its display list (when hardware-accelerated), 10602 * which is necessary when various parent-managed properties of the view change, such as 10603 * alpha, translationX/Y, scrollX/Y, scaleX/Y, and rotation/X/Y. This method only 10604 * clears the parent caches and does not causes an invalidate event. 10605 * 10606 * @hide 10607 */ 10608 protected void invalidateParentCaches() { 10609 if (mParent instanceof View) { 10610 ((View) mParent).mPrivateFlags |= PFLAG_INVALIDATED; 10611 } 10612 } 10613 10614 /** 10615 * Used to indicate that the parent of this view should be invalidated. This functionality 10616 * is used to force the parent to rebuild its display list (when hardware-accelerated), 10617 * which is necessary when various parent-managed properties of the view change, such as 10618 * alpha, translationX/Y, scrollX/Y, scaleX/Y, and rotation/X/Y. This method will propagate 10619 * an invalidation event to the parent. 10620 * 10621 * @hide 10622 */ 10623 protected void invalidateParentIfNeeded() { 10624 if (isHardwareAccelerated() && mParent instanceof View) { 10625 ((View) mParent).invalidate(true); 10626 } 10627 } 10628 10629 /** 10630 * Indicates whether this View is opaque. An opaque View guarantees that it will 10631 * draw all the pixels overlapping its bounds using a fully opaque color. 10632 * 10633 * Subclasses of View should override this method whenever possible to indicate 10634 * whether an instance is opaque. Opaque Views are treated in a special way by 10635 * the View hierarchy, possibly allowing it to perform optimizations during 10636 * invalidate/draw passes. 10637 * 10638 * @return True if this View is guaranteed to be fully opaque, false otherwise. 10639 */ 10640 @ViewDebug.ExportedProperty(category = "drawing") 10641 public boolean isOpaque() { 10642 return (mPrivateFlags & PFLAG_OPAQUE_MASK) == PFLAG_OPAQUE_MASK && 10643 ((mTransformationInfo != null ? mTransformationInfo.mAlpha : 1.0f) >= 1.0f); 10644 } 10645 10646 /** 10647 * @hide 10648 */ 10649 protected void computeOpaqueFlags() { 10650 // Opaque if: 10651 // - Has a background 10652 // - Background is opaque 10653 // - Doesn't have scrollbars or scrollbars overlay 10654 10655 if (mBackground != null && mBackground.getOpacity() == PixelFormat.OPAQUE) { 10656 mPrivateFlags |= PFLAG_OPAQUE_BACKGROUND; 10657 } else { 10658 mPrivateFlags &= ~PFLAG_OPAQUE_BACKGROUND; 10659 } 10660 10661 final int flags = mViewFlags; 10662 if (((flags & SCROLLBARS_VERTICAL) == 0 && (flags & SCROLLBARS_HORIZONTAL) == 0) || 10663 (flags & SCROLLBARS_STYLE_MASK) == SCROLLBARS_INSIDE_OVERLAY || 10664 (flags & SCROLLBARS_STYLE_MASK) == SCROLLBARS_OUTSIDE_OVERLAY) { 10665 mPrivateFlags |= PFLAG_OPAQUE_SCROLLBARS; 10666 } else { 10667 mPrivateFlags &= ~PFLAG_OPAQUE_SCROLLBARS; 10668 } 10669 } 10670 10671 /** 10672 * @hide 10673 */ 10674 protected boolean hasOpaqueScrollbars() { 10675 return (mPrivateFlags & PFLAG_OPAQUE_SCROLLBARS) == PFLAG_OPAQUE_SCROLLBARS; 10676 } 10677 10678 /** 10679 * @return A handler associated with the thread running the View. This 10680 * handler can be used to pump events in the UI events queue. 10681 */ 10682 public Handler getHandler() { 10683 if (mAttachInfo != null) { 10684 return mAttachInfo.mHandler; 10685 } 10686 return null; 10687 } 10688 10689 /** 10690 * Gets the view root associated with the View. 10691 * @return The view root, or null if none. 10692 * @hide 10693 */ 10694 public ViewRootImpl getViewRootImpl() { 10695 if (mAttachInfo != null) { 10696 return mAttachInfo.mViewRootImpl; 10697 } 10698 return null; 10699 } 10700 10701 /** 10702 * <p>Causes the Runnable to be added to the message queue. 10703 * The runnable will be run on the user interface thread.</p> 10704 * 10705 * @param action The Runnable that will be executed. 10706 * 10707 * @return Returns true if the Runnable was successfully placed in to the 10708 * message queue. Returns false on failure, usually because the 10709 * looper processing the message queue is exiting. 10710 * 10711 * @see #postDelayed 10712 * @see #removeCallbacks 10713 */ 10714 public boolean post(Runnable action) { 10715 final AttachInfo attachInfo = mAttachInfo; 10716 if (attachInfo != null) { 10717 return attachInfo.mHandler.post(action); 10718 } 10719 // Assume that post will succeed later 10720 ViewRootImpl.getRunQueue().post(action); 10721 return true; 10722 } 10723 10724 /** 10725 * <p>Causes the Runnable to be added to the message queue, to be run 10726 * after the specified amount of time elapses. 10727 * The runnable will be run on the user interface thread.</p> 10728 * 10729 * @param action The Runnable that will be executed. 10730 * @param delayMillis The delay (in milliseconds) until the Runnable 10731 * will be executed. 10732 * 10733 * @return true if the Runnable was successfully placed in to the 10734 * message queue. Returns false on failure, usually because the 10735 * looper processing the message queue is exiting. Note that a 10736 * result of true does not mean the Runnable will be processed -- 10737 * if the looper is quit before the delivery time of the message 10738 * occurs then the message will be dropped. 10739 * 10740 * @see #post 10741 * @see #removeCallbacks 10742 */ 10743 public boolean postDelayed(Runnable action, long delayMillis) { 10744 final AttachInfo attachInfo = mAttachInfo; 10745 if (attachInfo != null) { 10746 return attachInfo.mHandler.postDelayed(action, delayMillis); 10747 } 10748 // Assume that post will succeed later 10749 ViewRootImpl.getRunQueue().postDelayed(action, delayMillis); 10750 return true; 10751 } 10752 10753 /** 10754 * <p>Causes the Runnable to execute on the next animation time step. 10755 * The runnable will be run on the user interface thread.</p> 10756 * 10757 * @param action The Runnable that will be executed. 10758 * 10759 * @see #postOnAnimationDelayed 10760 * @see #removeCallbacks 10761 */ 10762 public void postOnAnimation(Runnable action) { 10763 final AttachInfo attachInfo = mAttachInfo; 10764 if (attachInfo != null) { 10765 attachInfo.mViewRootImpl.mChoreographer.postCallback( 10766 Choreographer.CALLBACK_ANIMATION, action, null); 10767 } else { 10768 // Assume that post will succeed later 10769 ViewRootImpl.getRunQueue().post(action); 10770 } 10771 } 10772 10773 /** 10774 * <p>Causes the Runnable to execute on the next animation time step, 10775 * after the specified amount of time elapses. 10776 * The runnable will be run on the user interface thread.</p> 10777 * 10778 * @param action The Runnable that will be executed. 10779 * @param delayMillis The delay (in milliseconds) until the Runnable 10780 * will be executed. 10781 * 10782 * @see #postOnAnimation 10783 * @see #removeCallbacks 10784 */ 10785 public void postOnAnimationDelayed(Runnable action, long delayMillis) { 10786 final AttachInfo attachInfo = mAttachInfo; 10787 if (attachInfo != null) { 10788 attachInfo.mViewRootImpl.mChoreographer.postCallbackDelayed( 10789 Choreographer.CALLBACK_ANIMATION, action, null, delayMillis); 10790 } else { 10791 // Assume that post will succeed later 10792 ViewRootImpl.getRunQueue().postDelayed(action, delayMillis); 10793 } 10794 } 10795 10796 /** 10797 * <p>Removes the specified Runnable from the message queue.</p> 10798 * 10799 * @param action The Runnable to remove from the message handling queue 10800 * 10801 * @return true if this view could ask the Handler to remove the Runnable, 10802 * false otherwise. When the returned value is true, the Runnable 10803 * may or may not have been actually removed from the message queue 10804 * (for instance, if the Runnable was not in the queue already.) 10805 * 10806 * @see #post 10807 * @see #postDelayed 10808 * @see #postOnAnimation 10809 * @see #postOnAnimationDelayed 10810 */ 10811 public boolean removeCallbacks(Runnable action) { 10812 if (action != null) { 10813 final AttachInfo attachInfo = mAttachInfo; 10814 if (attachInfo != null) { 10815 attachInfo.mHandler.removeCallbacks(action); 10816 attachInfo.mViewRootImpl.mChoreographer.removeCallbacks( 10817 Choreographer.CALLBACK_ANIMATION, action, null); 10818 } else { 10819 // Assume that post will succeed later 10820 ViewRootImpl.getRunQueue().removeCallbacks(action); 10821 } 10822 } 10823 return true; 10824 } 10825 10826 /** 10827 * <p>Cause an invalidate to happen on a subsequent cycle through the event loop. 10828 * Use this to invalidate the View from a non-UI thread.</p> 10829 * 10830 * <p>This method can be invoked from outside of the UI thread 10831 * only when this View is attached to a window.</p> 10832 * 10833 * @see #invalidate() 10834 * @see #postInvalidateDelayed(long) 10835 */ 10836 public void postInvalidate() { 10837 postInvalidateDelayed(0); 10838 } 10839 10840 /** 10841 * <p>Cause an invalidate of the specified area to happen on a subsequent cycle 10842 * through the event loop. Use this to invalidate the View from a non-UI thread.</p> 10843 * 10844 * <p>This method can be invoked from outside of the UI thread 10845 * only when this View is attached to a window.</p> 10846 * 10847 * @param left The left coordinate of the rectangle to invalidate. 10848 * @param top The top coordinate of the rectangle to invalidate. 10849 * @param right The right coordinate of the rectangle to invalidate. 10850 * @param bottom The bottom coordinate of the rectangle to invalidate. 10851 * 10852 * @see #invalidate(int, int, int, int) 10853 * @see #invalidate(Rect) 10854 * @see #postInvalidateDelayed(long, int, int, int, int) 10855 */ 10856 public void postInvalidate(int left, int top, int right, int bottom) { 10857 postInvalidateDelayed(0, left, top, right, bottom); 10858 } 10859 10860 /** 10861 * <p>Cause an invalidate to happen on a subsequent cycle through the event 10862 * loop. Waits for the specified amount of time.</p> 10863 * 10864 * <p>This method can be invoked from outside of the UI thread 10865 * only when this View is attached to a window.</p> 10866 * 10867 * @param delayMilliseconds the duration in milliseconds to delay the 10868 * invalidation by 10869 * 10870 * @see #invalidate() 10871 * @see #postInvalidate() 10872 */ 10873 public void postInvalidateDelayed(long delayMilliseconds) { 10874 // We try only with the AttachInfo because there's no point in invalidating 10875 // if we are not attached to our window 10876 final AttachInfo attachInfo = mAttachInfo; 10877 if (attachInfo != null) { 10878 attachInfo.mViewRootImpl.dispatchInvalidateDelayed(this, delayMilliseconds); 10879 } 10880 } 10881 10882 /** 10883 * <p>Cause an invalidate of the specified area to happen on a subsequent cycle 10884 * through the event loop. Waits for the specified amount of time.</p> 10885 * 10886 * <p>This method can be invoked from outside of the UI thread 10887 * only when this View is attached to a window.</p> 10888 * 10889 * @param delayMilliseconds the duration in milliseconds to delay the 10890 * invalidation by 10891 * @param left The left coordinate of the rectangle to invalidate. 10892 * @param top The top coordinate of the rectangle to invalidate. 10893 * @param right The right coordinate of the rectangle to invalidate. 10894 * @param bottom The bottom coordinate of the rectangle to invalidate. 10895 * 10896 * @see #invalidate(int, int, int, int) 10897 * @see #invalidate(Rect) 10898 * @see #postInvalidate(int, int, int, int) 10899 */ 10900 public void postInvalidateDelayed(long delayMilliseconds, int left, int top, 10901 int right, int bottom) { 10902 10903 // We try only with the AttachInfo because there's no point in invalidating 10904 // if we are not attached to our window 10905 final AttachInfo attachInfo = mAttachInfo; 10906 if (attachInfo != null) { 10907 final AttachInfo.InvalidateInfo info = AttachInfo.InvalidateInfo.obtain(); 10908 info.target = this; 10909 info.left = left; 10910 info.top = top; 10911 info.right = right; 10912 info.bottom = bottom; 10913 10914 attachInfo.mViewRootImpl.dispatchInvalidateRectDelayed(info, delayMilliseconds); 10915 } 10916 } 10917 10918 /** 10919 * <p>Cause an invalidate to happen on the next animation time step, typically the 10920 * next display frame.</p> 10921 * 10922 * <p>This method can be invoked from outside of the UI thread 10923 * only when this View is attached to a window.</p> 10924 * 10925 * @see #invalidate() 10926 */ 10927 public void postInvalidateOnAnimation() { 10928 // We try only with the AttachInfo because there's no point in invalidating 10929 // if we are not attached to our window 10930 final AttachInfo attachInfo = mAttachInfo; 10931 if (attachInfo != null) { 10932 attachInfo.mViewRootImpl.dispatchInvalidateOnAnimation(this); 10933 } 10934 } 10935 10936 /** 10937 * <p>Cause an invalidate of the specified area to happen on the next animation 10938 * time step, typically the next display frame.</p> 10939 * 10940 * <p>This method can be invoked from outside of the UI thread 10941 * only when this View is attached to a window.</p> 10942 * 10943 * @param left The left coordinate of the rectangle to invalidate. 10944 * @param top The top coordinate of the rectangle to invalidate. 10945 * @param right The right coordinate of the rectangle to invalidate. 10946 * @param bottom The bottom coordinate of the rectangle to invalidate. 10947 * 10948 * @see #invalidate(int, int, int, int) 10949 * @see #invalidate(Rect) 10950 */ 10951 public void postInvalidateOnAnimation(int left, int top, int right, int bottom) { 10952 // We try only with the AttachInfo because there's no point in invalidating 10953 // if we are not attached to our window 10954 final AttachInfo attachInfo = mAttachInfo; 10955 if (attachInfo != null) { 10956 final AttachInfo.InvalidateInfo info = AttachInfo.InvalidateInfo.obtain(); 10957 info.target = this; 10958 info.left = left; 10959 info.top = top; 10960 info.right = right; 10961 info.bottom = bottom; 10962 10963 attachInfo.mViewRootImpl.dispatchInvalidateRectOnAnimation(info); 10964 } 10965 } 10966 10967 /** 10968 * Post a callback to send a {@link AccessibilityEvent#TYPE_VIEW_SCROLLED} event. 10969 * This event is sent at most once every 10970 * {@link ViewConfiguration#getSendRecurringAccessibilityEventsInterval()}. 10971 */ 10972 private void postSendViewScrolledAccessibilityEventCallback() { 10973 if (mSendViewScrolledAccessibilityEvent == null) { 10974 mSendViewScrolledAccessibilityEvent = new SendViewScrolledAccessibilityEvent(); 10975 } 10976 if (!mSendViewScrolledAccessibilityEvent.mIsPending) { 10977 mSendViewScrolledAccessibilityEvent.mIsPending = true; 10978 postDelayed(mSendViewScrolledAccessibilityEvent, 10979 ViewConfiguration.getSendRecurringAccessibilityEventsInterval()); 10980 } 10981 } 10982 10983 /** 10984 * Called by a parent to request that a child update its values for mScrollX 10985 * and mScrollY if necessary. This will typically be done if the child is 10986 * animating a scroll using a {@link android.widget.Scroller Scroller} 10987 * object. 10988 */ 10989 public void computeScroll() { 10990 } 10991 10992 /** 10993 * <p>Indicate whether the horizontal edges are faded when the view is 10994 * scrolled horizontally.</p> 10995 * 10996 * @return true if the horizontal edges should are faded on scroll, false 10997 * otherwise 10998 * 10999 * @see #setHorizontalFadingEdgeEnabled(boolean) 11000 * 11001 * @attr ref android.R.styleable#View_requiresFadingEdge 11002 */ 11003 public boolean isHorizontalFadingEdgeEnabled() { 11004 return (mViewFlags & FADING_EDGE_HORIZONTAL) == FADING_EDGE_HORIZONTAL; 11005 } 11006 11007 /** 11008 * <p>Define whether the horizontal edges should be faded when this view 11009 * is scrolled horizontally.</p> 11010 * 11011 * @param horizontalFadingEdgeEnabled true if the horizontal edges should 11012 * be faded when the view is scrolled 11013 * horizontally 11014 * 11015 * @see #isHorizontalFadingEdgeEnabled() 11016 * 11017 * @attr ref android.R.styleable#View_requiresFadingEdge 11018 */ 11019 public void setHorizontalFadingEdgeEnabled(boolean horizontalFadingEdgeEnabled) { 11020 if (isHorizontalFadingEdgeEnabled() != horizontalFadingEdgeEnabled) { 11021 if (horizontalFadingEdgeEnabled) { 11022 initScrollCache(); 11023 } 11024 11025 mViewFlags ^= FADING_EDGE_HORIZONTAL; 11026 } 11027 } 11028 11029 /** 11030 * <p>Indicate whether the vertical edges are faded when the view is 11031 * scrolled horizontally.</p> 11032 * 11033 * @return true if the vertical edges should are faded on scroll, false 11034 * otherwise 11035 * 11036 * @see #setVerticalFadingEdgeEnabled(boolean) 11037 * 11038 * @attr ref android.R.styleable#View_requiresFadingEdge 11039 */ 11040 public boolean isVerticalFadingEdgeEnabled() { 11041 return (mViewFlags & FADING_EDGE_VERTICAL) == FADING_EDGE_VERTICAL; 11042 } 11043 11044 /** 11045 * <p>Define whether the vertical edges should be faded when this view 11046 * is scrolled vertically.</p> 11047 * 11048 * @param verticalFadingEdgeEnabled true if the vertical edges should 11049 * be faded when the view is scrolled 11050 * vertically 11051 * 11052 * @see #isVerticalFadingEdgeEnabled() 11053 * 11054 * @attr ref android.R.styleable#View_requiresFadingEdge 11055 */ 11056 public void setVerticalFadingEdgeEnabled(boolean verticalFadingEdgeEnabled) { 11057 if (isVerticalFadingEdgeEnabled() != verticalFadingEdgeEnabled) { 11058 if (verticalFadingEdgeEnabled) { 11059 initScrollCache(); 11060 } 11061 11062 mViewFlags ^= FADING_EDGE_VERTICAL; 11063 } 11064 } 11065 11066 /** 11067 * Returns the strength, or intensity, of the top faded edge. The strength is 11068 * a value between 0.0 (no fade) and 1.0 (full fade). The default implementation 11069 * returns 0.0 or 1.0 but no value in between. 11070 * 11071 * Subclasses should override this method to provide a smoother fade transition 11072 * when scrolling occurs. 11073 * 11074 * @return the intensity of the top fade as a float between 0.0f and 1.0f 11075 */ 11076 protected float getTopFadingEdgeStrength() { 11077 return computeVerticalScrollOffset() > 0 ? 1.0f : 0.0f; 11078 } 11079 11080 /** 11081 * Returns the strength, or intensity, of the bottom faded edge. The strength is 11082 * a value between 0.0 (no fade) and 1.0 (full fade). The default implementation 11083 * returns 0.0 or 1.0 but no value in between. 11084 * 11085 * Subclasses should override this method to provide a smoother fade transition 11086 * when scrolling occurs. 11087 * 11088 * @return the intensity of the bottom fade as a float between 0.0f and 1.0f 11089 */ 11090 protected float getBottomFadingEdgeStrength() { 11091 return computeVerticalScrollOffset() + computeVerticalScrollExtent() < 11092 computeVerticalScrollRange() ? 1.0f : 0.0f; 11093 } 11094 11095 /** 11096 * Returns the strength, or intensity, of the left faded edge. The strength is 11097 * a value between 0.0 (no fade) and 1.0 (full fade). The default implementation 11098 * returns 0.0 or 1.0 but no value in between. 11099 * 11100 * Subclasses should override this method to provide a smoother fade transition 11101 * when scrolling occurs. 11102 * 11103 * @return the intensity of the left fade as a float between 0.0f and 1.0f 11104 */ 11105 protected float getLeftFadingEdgeStrength() { 11106 return computeHorizontalScrollOffset() > 0 ? 1.0f : 0.0f; 11107 } 11108 11109 /** 11110 * Returns the strength, or intensity, of the right faded edge. The strength is 11111 * a value between 0.0 (no fade) and 1.0 (full fade). The default implementation 11112 * returns 0.0 or 1.0 but no value in between. 11113 * 11114 * Subclasses should override this method to provide a smoother fade transition 11115 * when scrolling occurs. 11116 * 11117 * @return the intensity of the right fade as a float between 0.0f and 1.0f 11118 */ 11119 protected float getRightFadingEdgeStrength() { 11120 return computeHorizontalScrollOffset() + computeHorizontalScrollExtent() < 11121 computeHorizontalScrollRange() ? 1.0f : 0.0f; 11122 } 11123 11124 /** 11125 * <p>Indicate whether the horizontal scrollbar should be drawn or not. The 11126 * scrollbar is not drawn by default.</p> 11127 * 11128 * @return true if the horizontal scrollbar should be painted, false 11129 * otherwise 11130 * 11131 * @see #setHorizontalScrollBarEnabled(boolean) 11132 */ 11133 public boolean isHorizontalScrollBarEnabled() { 11134 return (mViewFlags & SCROLLBARS_HORIZONTAL) == SCROLLBARS_HORIZONTAL; 11135 } 11136 11137 /** 11138 * <p>Define whether the horizontal scrollbar should be drawn or not. The 11139 * scrollbar is not drawn by default.</p> 11140 * 11141 * @param horizontalScrollBarEnabled true if the horizontal scrollbar should 11142 * be painted 11143 * 11144 * @see #isHorizontalScrollBarEnabled() 11145 */ 11146 public void setHorizontalScrollBarEnabled(boolean horizontalScrollBarEnabled) { 11147 if (isHorizontalScrollBarEnabled() != horizontalScrollBarEnabled) { 11148 mViewFlags ^= SCROLLBARS_HORIZONTAL; 11149 computeOpaqueFlags(); 11150 resolvePadding(); 11151 } 11152 } 11153 11154 /** 11155 * <p>Indicate whether the vertical scrollbar should be drawn or not. The 11156 * scrollbar is not drawn by default.</p> 11157 * 11158 * @return true if the vertical scrollbar should be painted, false 11159 * otherwise 11160 * 11161 * @see #setVerticalScrollBarEnabled(boolean) 11162 */ 11163 public boolean isVerticalScrollBarEnabled() { 11164 return (mViewFlags & SCROLLBARS_VERTICAL) == SCROLLBARS_VERTICAL; 11165 } 11166 11167 /** 11168 * <p>Define whether the vertical scrollbar should be drawn or not. The 11169 * scrollbar is not drawn by default.</p> 11170 * 11171 * @param verticalScrollBarEnabled true if the vertical scrollbar should 11172 * be painted 11173 * 11174 * @see #isVerticalScrollBarEnabled() 11175 */ 11176 public void setVerticalScrollBarEnabled(boolean verticalScrollBarEnabled) { 11177 if (isVerticalScrollBarEnabled() != verticalScrollBarEnabled) { 11178 mViewFlags ^= SCROLLBARS_VERTICAL; 11179 computeOpaqueFlags(); 11180 resolvePadding(); 11181 } 11182 } 11183 11184 /** 11185 * @hide 11186 */ 11187 protected void recomputePadding() { 11188 internalSetPadding(mUserPaddingLeft, mPaddingTop, mUserPaddingRight, mUserPaddingBottom); 11189 } 11190 11191 /** 11192 * Define whether scrollbars will fade when the view is not scrolling. 11193 * 11194 * @param fadeScrollbars wheter to enable fading 11195 * 11196 * @attr ref android.R.styleable#View_fadeScrollbars 11197 */ 11198 public void setScrollbarFadingEnabled(boolean fadeScrollbars) { 11199 initScrollCache(); 11200 final ScrollabilityCache scrollabilityCache = mScrollCache; 11201 scrollabilityCache.fadeScrollBars = fadeScrollbars; 11202 if (fadeScrollbars) { 11203 scrollabilityCache.state = ScrollabilityCache.OFF; 11204 } else { 11205 scrollabilityCache.state = ScrollabilityCache.ON; 11206 } 11207 } 11208 11209 /** 11210 * 11211 * Returns true if scrollbars will fade when this view is not scrolling 11212 * 11213 * @return true if scrollbar fading is enabled 11214 * 11215 * @attr ref android.R.styleable#View_fadeScrollbars 11216 */ 11217 public boolean isScrollbarFadingEnabled() { 11218 return mScrollCache != null && mScrollCache.fadeScrollBars; 11219 } 11220 11221 /** 11222 * 11223 * Returns the delay before scrollbars fade. 11224 * 11225 * @return the delay before scrollbars fade 11226 * 11227 * @attr ref android.R.styleable#View_scrollbarDefaultDelayBeforeFade 11228 */ 11229 public int getScrollBarDefaultDelayBeforeFade() { 11230 return mScrollCache == null ? ViewConfiguration.getScrollDefaultDelay() : 11231 mScrollCache.scrollBarDefaultDelayBeforeFade; 11232 } 11233 11234 /** 11235 * Define the delay before scrollbars fade. 11236 * 11237 * @param scrollBarDefaultDelayBeforeFade - the delay before scrollbars fade 11238 * 11239 * @attr ref android.R.styleable#View_scrollbarDefaultDelayBeforeFade 11240 */ 11241 public void setScrollBarDefaultDelayBeforeFade(int scrollBarDefaultDelayBeforeFade) { 11242 getScrollCache().scrollBarDefaultDelayBeforeFade = scrollBarDefaultDelayBeforeFade; 11243 } 11244 11245 /** 11246 * 11247 * Returns the scrollbar fade duration. 11248 * 11249 * @return the scrollbar fade duration 11250 * 11251 * @attr ref android.R.styleable#View_scrollbarFadeDuration 11252 */ 11253 public int getScrollBarFadeDuration() { 11254 return mScrollCache == null ? ViewConfiguration.getScrollBarFadeDuration() : 11255 mScrollCache.scrollBarFadeDuration; 11256 } 11257 11258 /** 11259 * Define the scrollbar fade duration. 11260 * 11261 * @param scrollBarFadeDuration - the scrollbar fade duration 11262 * 11263 * @attr ref android.R.styleable#View_scrollbarFadeDuration 11264 */ 11265 public void setScrollBarFadeDuration(int scrollBarFadeDuration) { 11266 getScrollCache().scrollBarFadeDuration = scrollBarFadeDuration; 11267 } 11268 11269 /** 11270 * 11271 * Returns the scrollbar size. 11272 * 11273 * @return the scrollbar size 11274 * 11275 * @attr ref android.R.styleable#View_scrollbarSize 11276 */ 11277 public int getScrollBarSize() { 11278 return mScrollCache == null ? ViewConfiguration.get(mContext).getScaledScrollBarSize() : 11279 mScrollCache.scrollBarSize; 11280 } 11281 11282 /** 11283 * Define the scrollbar size. 11284 * 11285 * @param scrollBarSize - the scrollbar size 11286 * 11287 * @attr ref android.R.styleable#View_scrollbarSize 11288 */ 11289 public void setScrollBarSize(int scrollBarSize) { 11290 getScrollCache().scrollBarSize = scrollBarSize; 11291 } 11292 11293 /** 11294 * <p>Specify the style of the scrollbars. The scrollbars can be overlaid or 11295 * inset. When inset, they add to the padding of the view. And the scrollbars 11296 * can be drawn inside the padding area or on the edge of the view. For example, 11297 * if a view has a background drawable and you want to draw the scrollbars 11298 * inside the padding specified by the drawable, you can use 11299 * SCROLLBARS_INSIDE_OVERLAY or SCROLLBARS_INSIDE_INSET. If you want them to 11300 * appear at the edge of the view, ignoring the padding, then you can use 11301 * SCROLLBARS_OUTSIDE_OVERLAY or SCROLLBARS_OUTSIDE_INSET.</p> 11302 * @param style the style of the scrollbars. Should be one of 11303 * SCROLLBARS_INSIDE_OVERLAY, SCROLLBARS_INSIDE_INSET, 11304 * SCROLLBARS_OUTSIDE_OVERLAY or SCROLLBARS_OUTSIDE_INSET. 11305 * @see #SCROLLBARS_INSIDE_OVERLAY 11306 * @see #SCROLLBARS_INSIDE_INSET 11307 * @see #SCROLLBARS_OUTSIDE_OVERLAY 11308 * @see #SCROLLBARS_OUTSIDE_INSET 11309 * 11310 * @attr ref android.R.styleable#View_scrollbarStyle 11311 */ 11312 public void setScrollBarStyle(int style) { 11313 if (style != (mViewFlags & SCROLLBARS_STYLE_MASK)) { 11314 mViewFlags = (mViewFlags & ~SCROLLBARS_STYLE_MASK) | (style & SCROLLBARS_STYLE_MASK); 11315 computeOpaqueFlags(); 11316 resolvePadding(); 11317 } 11318 } 11319 11320 /** 11321 * <p>Returns the current scrollbar style.</p> 11322 * @return the current scrollbar style 11323 * @see #SCROLLBARS_INSIDE_OVERLAY 11324 * @see #SCROLLBARS_INSIDE_INSET 11325 * @see #SCROLLBARS_OUTSIDE_OVERLAY 11326 * @see #SCROLLBARS_OUTSIDE_INSET 11327 * 11328 * @attr ref android.R.styleable#View_scrollbarStyle 11329 */ 11330 @ViewDebug.ExportedProperty(mapping = { 11331 @ViewDebug.IntToString(from = SCROLLBARS_INSIDE_OVERLAY, to = "INSIDE_OVERLAY"), 11332 @ViewDebug.IntToString(from = SCROLLBARS_INSIDE_INSET, to = "INSIDE_INSET"), 11333 @ViewDebug.IntToString(from = SCROLLBARS_OUTSIDE_OVERLAY, to = "OUTSIDE_OVERLAY"), 11334 @ViewDebug.IntToString(from = SCROLLBARS_OUTSIDE_INSET, to = "OUTSIDE_INSET") 11335 }) 11336 public int getScrollBarStyle() { 11337 return mViewFlags & SCROLLBARS_STYLE_MASK; 11338 } 11339 11340 /** 11341 * <p>Compute the horizontal range that the horizontal scrollbar 11342 * represents.</p> 11343 * 11344 * <p>The range is expressed in arbitrary units that must be the same as the 11345 * units used by {@link #computeHorizontalScrollExtent()} and 11346 * {@link #computeHorizontalScrollOffset()}.</p> 11347 * 11348 * <p>The default range is the drawing width of this view.</p> 11349 * 11350 * @return the total horizontal range represented by the horizontal 11351 * scrollbar 11352 * 11353 * @see #computeHorizontalScrollExtent() 11354 * @see #computeHorizontalScrollOffset() 11355 * @see android.widget.ScrollBarDrawable 11356 */ 11357 protected int computeHorizontalScrollRange() { 11358 return getWidth(); 11359 } 11360 11361 /** 11362 * <p>Compute the horizontal offset of the horizontal scrollbar's thumb 11363 * within the horizontal range. This value is used to compute the position 11364 * of the thumb within the scrollbar's track.</p> 11365 * 11366 * <p>The range is expressed in arbitrary units that must be the same as the 11367 * units used by {@link #computeHorizontalScrollRange()} and 11368 * {@link #computeHorizontalScrollExtent()}.</p> 11369 * 11370 * <p>The default offset is the scroll offset of this view.</p> 11371 * 11372 * @return the horizontal offset of the scrollbar's thumb 11373 * 11374 * @see #computeHorizontalScrollRange() 11375 * @see #computeHorizontalScrollExtent() 11376 * @see android.widget.ScrollBarDrawable 11377 */ 11378 protected int computeHorizontalScrollOffset() { 11379 return mScrollX; 11380 } 11381 11382 /** 11383 * <p>Compute the horizontal extent of the horizontal scrollbar's thumb 11384 * within the horizontal range. This value is used to compute the length 11385 * of the thumb within the scrollbar's track.</p> 11386 * 11387 * <p>The range is expressed in arbitrary units that must be the same as the 11388 * units used by {@link #computeHorizontalScrollRange()} and 11389 * {@link #computeHorizontalScrollOffset()}.</p> 11390 * 11391 * <p>The default extent is the drawing width of this view.</p> 11392 * 11393 * @return the horizontal extent of the scrollbar's thumb 11394 * 11395 * @see #computeHorizontalScrollRange() 11396 * @see #computeHorizontalScrollOffset() 11397 * @see android.widget.ScrollBarDrawable 11398 */ 11399 protected int computeHorizontalScrollExtent() { 11400 return getWidth(); 11401 } 11402 11403 /** 11404 * <p>Compute the vertical range that the vertical scrollbar represents.</p> 11405 * 11406 * <p>The range is expressed in arbitrary units that must be the same as the 11407 * units used by {@link #computeVerticalScrollExtent()} and 11408 * {@link #computeVerticalScrollOffset()}.</p> 11409 * 11410 * @return the total vertical range represented by the vertical scrollbar 11411 * 11412 * <p>The default range is the drawing height of this view.</p> 11413 * 11414 * @see #computeVerticalScrollExtent() 11415 * @see #computeVerticalScrollOffset() 11416 * @see android.widget.ScrollBarDrawable 11417 */ 11418 protected int computeVerticalScrollRange() { 11419 return getHeight(); 11420 } 11421 11422 /** 11423 * <p>Compute the vertical offset of the vertical scrollbar's thumb 11424 * within the horizontal range. This value is used to compute the position 11425 * of the thumb within the scrollbar's track.</p> 11426 * 11427 * <p>The range is expressed in arbitrary units that must be the same as the 11428 * units used by {@link #computeVerticalScrollRange()} and 11429 * {@link #computeVerticalScrollExtent()}.</p> 11430 * 11431 * <p>The default offset is the scroll offset of this view.</p> 11432 * 11433 * @return the vertical offset of the scrollbar's thumb 11434 * 11435 * @see #computeVerticalScrollRange() 11436 * @see #computeVerticalScrollExtent() 11437 * @see android.widget.ScrollBarDrawable 11438 */ 11439 protected int computeVerticalScrollOffset() { 11440 return mScrollY; 11441 } 11442 11443 /** 11444 * <p>Compute the vertical extent of the horizontal scrollbar's thumb 11445 * within the vertical range. This value is used to compute the length 11446 * of the thumb within the scrollbar's track.</p> 11447 * 11448 * <p>The range is expressed in arbitrary units that must be the same as the 11449 * units used by {@link #computeVerticalScrollRange()} and 11450 * {@link #computeVerticalScrollOffset()}.</p> 11451 * 11452 * <p>The default extent is the drawing height of this view.</p> 11453 * 11454 * @return the vertical extent of the scrollbar's thumb 11455 * 11456 * @see #computeVerticalScrollRange() 11457 * @see #computeVerticalScrollOffset() 11458 * @see android.widget.ScrollBarDrawable 11459 */ 11460 protected int computeVerticalScrollExtent() { 11461 return getHeight(); 11462 } 11463 11464 /** 11465 * Check if this view can be scrolled horizontally in a certain direction. 11466 * 11467 * @param direction Negative to check scrolling left, positive to check scrolling right. 11468 * @return true if this view can be scrolled in the specified direction, false otherwise. 11469 */ 11470 public boolean canScrollHorizontally(int direction) { 11471 final int offset = computeHorizontalScrollOffset(); 11472 final int range = computeHorizontalScrollRange() - computeHorizontalScrollExtent(); 11473 if (range == 0) return false; 11474 if (direction < 0) { 11475 return offset > 0; 11476 } else { 11477 return offset < range - 1; 11478 } 11479 } 11480 11481 /** 11482 * Check if this view can be scrolled vertically in a certain direction. 11483 * 11484 * @param direction Negative to check scrolling up, positive to check scrolling down. 11485 * @return true if this view can be scrolled in the specified direction, false otherwise. 11486 */ 11487 public boolean canScrollVertically(int direction) { 11488 final int offset = computeVerticalScrollOffset(); 11489 final int range = computeVerticalScrollRange() - computeVerticalScrollExtent(); 11490 if (range == 0) return false; 11491 if (direction < 0) { 11492 return offset > 0; 11493 } else { 11494 return offset < range - 1; 11495 } 11496 } 11497 11498 /** 11499 * <p>Request the drawing of the horizontal and the vertical scrollbar. The 11500 * scrollbars are painted only if they have been awakened first.</p> 11501 * 11502 * @param canvas the canvas on which to draw the scrollbars 11503 * 11504 * @see #awakenScrollBars(int) 11505 */ 11506 protected final void onDrawScrollBars(Canvas canvas) { 11507 // scrollbars are drawn only when the animation is running 11508 final ScrollabilityCache cache = mScrollCache; 11509 if (cache != null) { 11510 11511 int state = cache.state; 11512 11513 if (state == ScrollabilityCache.OFF) { 11514 return; 11515 } 11516 11517 boolean invalidate = false; 11518 11519 if (state == ScrollabilityCache.FADING) { 11520 // We're fading -- get our fade interpolation 11521 if (cache.interpolatorValues == null) { 11522 cache.interpolatorValues = new float[1]; 11523 } 11524 11525 float[] values = cache.interpolatorValues; 11526 11527 // Stops the animation if we're done 11528 if (cache.scrollBarInterpolator.timeToValues(values) == 11529 Interpolator.Result.FREEZE_END) { 11530 cache.state = ScrollabilityCache.OFF; 11531 } else { 11532 cache.scrollBar.setAlpha(Math.round(values[0])); 11533 } 11534 11535 // This will make the scroll bars inval themselves after 11536 // drawing. We only want this when we're fading so that 11537 // we prevent excessive redraws 11538 invalidate = true; 11539 } else { 11540 // We're just on -- but we may have been fading before so 11541 // reset alpha 11542 cache.scrollBar.setAlpha(255); 11543 } 11544 11545 11546 final int viewFlags = mViewFlags; 11547 11548 final boolean drawHorizontalScrollBar = 11549 (viewFlags & SCROLLBARS_HORIZONTAL) == SCROLLBARS_HORIZONTAL; 11550 final boolean drawVerticalScrollBar = 11551 (viewFlags & SCROLLBARS_VERTICAL) == SCROLLBARS_VERTICAL 11552 && !isVerticalScrollBarHidden(); 11553 11554 if (drawVerticalScrollBar || drawHorizontalScrollBar) { 11555 final int width = mRight - mLeft; 11556 final int height = mBottom - mTop; 11557 11558 final ScrollBarDrawable scrollBar = cache.scrollBar; 11559 11560 final int scrollX = mScrollX; 11561 final int scrollY = mScrollY; 11562 final int inside = (viewFlags & SCROLLBARS_OUTSIDE_MASK) == 0 ? ~0 : 0; 11563 11564 int left; 11565 int top; 11566 int right; 11567 int bottom; 11568 11569 if (drawHorizontalScrollBar) { 11570 int size = scrollBar.getSize(false); 11571 if (size <= 0) { 11572 size = cache.scrollBarSize; 11573 } 11574 11575 scrollBar.setParameters(computeHorizontalScrollRange(), 11576 computeHorizontalScrollOffset(), 11577 computeHorizontalScrollExtent(), false); 11578 final int verticalScrollBarGap = drawVerticalScrollBar ? 11579 getVerticalScrollbarWidth() : 0; 11580 top = scrollY + height - size - (mUserPaddingBottom & inside); 11581 left = scrollX + (mPaddingLeft & inside); 11582 right = scrollX + width - (mUserPaddingRight & inside) - verticalScrollBarGap; 11583 bottom = top + size; 11584 onDrawHorizontalScrollBar(canvas, scrollBar, left, top, right, bottom); 11585 if (invalidate) { 11586 invalidate(left, top, right, bottom); 11587 } 11588 } 11589 11590 if (drawVerticalScrollBar) { 11591 int size = scrollBar.getSize(true); 11592 if (size <= 0) { 11593 size = cache.scrollBarSize; 11594 } 11595 11596 scrollBar.setParameters(computeVerticalScrollRange(), 11597 computeVerticalScrollOffset(), 11598 computeVerticalScrollExtent(), true); 11599 int verticalScrollbarPosition = mVerticalScrollbarPosition; 11600 if (verticalScrollbarPosition == SCROLLBAR_POSITION_DEFAULT) { 11601 verticalScrollbarPosition = isLayoutRtl() ? 11602 SCROLLBAR_POSITION_LEFT : SCROLLBAR_POSITION_RIGHT; 11603 } 11604 switch (verticalScrollbarPosition) { 11605 default: 11606 case SCROLLBAR_POSITION_RIGHT: 11607 left = scrollX + width - size - (mUserPaddingRight & inside); 11608 break; 11609 case SCROLLBAR_POSITION_LEFT: 11610 left = scrollX + (mUserPaddingLeft & inside); 11611 break; 11612 } 11613 top = scrollY + (mPaddingTop & inside); 11614 right = left + size; 11615 bottom = scrollY + height - (mUserPaddingBottom & inside); 11616 onDrawVerticalScrollBar(canvas, scrollBar, left, top, right, bottom); 11617 if (invalidate) { 11618 invalidate(left, top, right, bottom); 11619 } 11620 } 11621 } 11622 } 11623 } 11624 11625 /** 11626 * Override this if the vertical scrollbar needs to be hidden in a subclass, like when 11627 * FastScroller is visible. 11628 * @return whether to temporarily hide the vertical scrollbar 11629 * @hide 11630 */ 11631 protected boolean isVerticalScrollBarHidden() { 11632 return false; 11633 } 11634 11635 /** 11636 * <p>Draw the horizontal scrollbar if 11637 * {@link #isHorizontalScrollBarEnabled()} returns true.</p> 11638 * 11639 * @param canvas the canvas on which to draw the scrollbar 11640 * @param scrollBar the scrollbar's drawable 11641 * 11642 * @see #isHorizontalScrollBarEnabled() 11643 * @see #computeHorizontalScrollRange() 11644 * @see #computeHorizontalScrollExtent() 11645 * @see #computeHorizontalScrollOffset() 11646 * @see android.widget.ScrollBarDrawable 11647 * @hide 11648 */ 11649 protected void onDrawHorizontalScrollBar(Canvas canvas, Drawable scrollBar, 11650 int l, int t, int r, int b) { 11651 scrollBar.setBounds(l, t, r, b); 11652 scrollBar.draw(canvas); 11653 } 11654 11655 /** 11656 * <p>Draw the vertical scrollbar if {@link #isVerticalScrollBarEnabled()} 11657 * returns true.</p> 11658 * 11659 * @param canvas the canvas on which to draw the scrollbar 11660 * @param scrollBar the scrollbar's drawable 11661 * 11662 * @see #isVerticalScrollBarEnabled() 11663 * @see #computeVerticalScrollRange() 11664 * @see #computeVerticalScrollExtent() 11665 * @see #computeVerticalScrollOffset() 11666 * @see android.widget.ScrollBarDrawable 11667 * @hide 11668 */ 11669 protected void onDrawVerticalScrollBar(Canvas canvas, Drawable scrollBar, 11670 int l, int t, int r, int b) { 11671 scrollBar.setBounds(l, t, r, b); 11672 scrollBar.draw(canvas); 11673 } 11674 11675 /** 11676 * Implement this to do your drawing. 11677 * 11678 * @param canvas the canvas on which the background will be drawn 11679 */ 11680 protected void onDraw(Canvas canvas) { 11681 } 11682 11683 /* 11684 * Caller is responsible for calling requestLayout if necessary. 11685 * (This allows addViewInLayout to not request a new layout.) 11686 */ 11687 void assignParent(ViewParent parent) { 11688 if (mParent == null) { 11689 mParent = parent; 11690 } else if (parent == null) { 11691 mParent = null; 11692 } else { 11693 throw new RuntimeException("view " + this + " being added, but" 11694 + " it already has a parent"); 11695 } 11696 } 11697 11698 /** 11699 * This is called when the view is attached to a window. At this point it 11700 * has a Surface and will start drawing. Note that this function is 11701 * guaranteed to be called before {@link #onDraw(android.graphics.Canvas)}, 11702 * however it may be called any time before the first onDraw -- including 11703 * before or after {@link #onMeasure(int, int)}. 11704 * 11705 * @see #onDetachedFromWindow() 11706 */ 11707 protected void onAttachedToWindow() { 11708 if ((mPrivateFlags & PFLAG_REQUEST_TRANSPARENT_REGIONS) != 0) { 11709 mParent.requestTransparentRegion(this); 11710 } 11711 11712 if ((mPrivateFlags & PFLAG_AWAKEN_SCROLL_BARS_ON_ATTACH) != 0) { 11713 initialAwakenScrollBars(); 11714 mPrivateFlags &= ~PFLAG_AWAKEN_SCROLL_BARS_ON_ATTACH; 11715 } 11716 11717 jumpDrawablesToCurrentState(); 11718 11719 clearAccessibilityFocus(); 11720 if (isFocused()) { 11721 InputMethodManager imm = InputMethodManager.peekInstance(); 11722 imm.focusIn(this); 11723 } 11724 11725 if (mDisplayList != null) { 11726 mDisplayList.clearDirty(); 11727 } 11728 } 11729 11730 /** 11731 * Resolve all RTL related properties. 11732 * 11733 * @return true if resolution of RTL properties has been done 11734 * 11735 * @hide 11736 */ 11737 public boolean resolveRtlPropertiesIfNeeded() { 11738 if (!needRtlPropertiesResolution()) return false; 11739 11740 // Order is important here: LayoutDirection MUST be resolved first 11741 if (!isLayoutDirectionResolved()) { 11742 resolveLayoutDirection(); 11743 resolveLayoutParams(); 11744 } 11745 // ... then we can resolve the others properties depending on the resolved LayoutDirection. 11746 if (!isTextDirectionResolved()) { 11747 resolveTextDirection(); 11748 } 11749 if (!isTextAlignmentResolved()) { 11750 resolveTextAlignment(); 11751 } 11752 if (!isPaddingResolved()) { 11753 resolvePadding(); 11754 } 11755 if (!isDrawablesResolved()) { 11756 resolveDrawables(); 11757 } 11758 onRtlPropertiesChanged(getLayoutDirection()); 11759 return true; 11760 } 11761 11762 /** 11763 * Reset resolution of all RTL related properties. 11764 * 11765 * @hide 11766 */ 11767 public void resetRtlProperties() { 11768 resetResolvedLayoutDirection(); 11769 resetResolvedTextDirection(); 11770 resetResolvedTextAlignment(); 11771 resetResolvedPadding(); 11772 resetResolvedDrawables(); 11773 } 11774 11775 /** 11776 * @see #onScreenStateChanged(int) 11777 */ 11778 void dispatchScreenStateChanged(int screenState) { 11779 onScreenStateChanged(screenState); 11780 } 11781 11782 /** 11783 * This method is called whenever the state of the screen this view is 11784 * attached to changes. A state change will usually occurs when the screen 11785 * turns on or off (whether it happens automatically or the user does it 11786 * manually.) 11787 * 11788 * @param screenState The new state of the screen. Can be either 11789 * {@link #SCREEN_STATE_ON} or {@link #SCREEN_STATE_OFF} 11790 */ 11791 public void onScreenStateChanged(int screenState) { 11792 } 11793 11794 /** 11795 * Return true if the application tag in the AndroidManifest has set "supportRtl" to true 11796 */ 11797 private boolean hasRtlSupport() { 11798 return mContext.getApplicationInfo().hasRtlSupport(); 11799 } 11800 11801 /** 11802 * Return true if we are in RTL compatibility mode (either before Jelly Bean MR1 or 11803 * RTL not supported) 11804 */ 11805 private boolean isRtlCompatibilityMode() { 11806 final int targetSdkVersion = getContext().getApplicationInfo().targetSdkVersion; 11807 return targetSdkVersion < JELLY_BEAN_MR1 || !hasRtlSupport(); 11808 } 11809 11810 /** 11811 * @return true if RTL properties need resolution. 11812 * 11813 */ 11814 private boolean needRtlPropertiesResolution() { 11815 return (mPrivateFlags2 & ALL_RTL_PROPERTIES_RESOLVED) != ALL_RTL_PROPERTIES_RESOLVED; 11816 } 11817 11818 /** 11819 * Called when any RTL property (layout direction or text direction or text alignment) has 11820 * been changed. 11821 * 11822 * Subclasses need to override this method to take care of cached information that depends on the 11823 * resolved layout direction, or to inform child views that inherit their layout direction. 11824 * 11825 * The default implementation does nothing. 11826 * 11827 * @param layoutDirection the direction of the layout 11828 * 11829 * @see #LAYOUT_DIRECTION_LTR 11830 * @see #LAYOUT_DIRECTION_RTL 11831 */ 11832 public void onRtlPropertiesChanged(int layoutDirection) { 11833 } 11834 11835 /** 11836 * Resolve and cache the layout direction. LTR is set initially. This is implicitly supposing 11837 * that the parent directionality can and will be resolved before its children. 11838 * 11839 * @return true if resolution has been done, false otherwise. 11840 * 11841 * @hide 11842 */ 11843 public boolean resolveLayoutDirection() { 11844 // Clear any previous layout direction resolution 11845 mPrivateFlags2 &= ~PFLAG2_LAYOUT_DIRECTION_RESOLVED_MASK; 11846 11847 if (hasRtlSupport()) { 11848 // Set resolved depending on layout direction 11849 switch ((mPrivateFlags2 & PFLAG2_LAYOUT_DIRECTION_MASK) >> 11850 PFLAG2_LAYOUT_DIRECTION_MASK_SHIFT) { 11851 case LAYOUT_DIRECTION_INHERIT: 11852 // We cannot resolve yet. LTR is by default and let the resolution happen again 11853 // later to get the correct resolved value 11854 if (!canResolveLayoutDirection()) return false; 11855 11856 // Parent has not yet resolved, LTR is still the default 11857 if (!mParent.isLayoutDirectionResolved()) return false; 11858 11859 if (mParent.getLayoutDirection() == LAYOUT_DIRECTION_RTL) { 11860 mPrivateFlags2 |= PFLAG2_LAYOUT_DIRECTION_RESOLVED_RTL; 11861 } 11862 break; 11863 case LAYOUT_DIRECTION_RTL: 11864 mPrivateFlags2 |= PFLAG2_LAYOUT_DIRECTION_RESOLVED_RTL; 11865 break; 11866 case LAYOUT_DIRECTION_LOCALE: 11867 if((LAYOUT_DIRECTION_RTL == 11868 TextUtils.getLayoutDirectionFromLocale(Locale.getDefault()))) { 11869 mPrivateFlags2 |= PFLAG2_LAYOUT_DIRECTION_RESOLVED_RTL; 11870 } 11871 break; 11872 default: 11873 // Nothing to do, LTR by default 11874 } 11875 } 11876 11877 // Set to resolved 11878 mPrivateFlags2 |= PFLAG2_LAYOUT_DIRECTION_RESOLVED; 11879 return true; 11880 } 11881 11882 /** 11883 * Check if layout direction resolution can be done. 11884 * 11885 * @return true if layout direction resolution can be done otherwise return false. 11886 * 11887 * @hide 11888 */ 11889 public boolean canResolveLayoutDirection() { 11890 switch (getRawLayoutDirection()) { 11891 case LAYOUT_DIRECTION_INHERIT: 11892 return (mParent != null) && mParent.canResolveLayoutDirection(); 11893 default: 11894 return true; 11895 } 11896 } 11897 11898 /** 11899 * Reset the resolved layout direction. Layout direction will be resolved during a call to 11900 * {@link #onMeasure(int, int)}. 11901 * 11902 * @hide 11903 */ 11904 public void resetResolvedLayoutDirection() { 11905 // Reset the current resolved bits 11906 mPrivateFlags2 &= ~PFLAG2_LAYOUT_DIRECTION_RESOLVED_MASK; 11907 } 11908 11909 /** 11910 * @return true if the layout direction is inherited. 11911 * 11912 * @hide 11913 */ 11914 public boolean isLayoutDirectionInherited() { 11915 return (getRawLayoutDirection() == LAYOUT_DIRECTION_INHERIT); 11916 } 11917 11918 /** 11919 * @return true if layout direction has been resolved. 11920 * @hide 11921 */ 11922 public boolean isLayoutDirectionResolved() { 11923 return (mPrivateFlags2 & PFLAG2_LAYOUT_DIRECTION_RESOLVED) == PFLAG2_LAYOUT_DIRECTION_RESOLVED; 11924 } 11925 11926 /** 11927 * Return if padding has been resolved 11928 * 11929 * @hide 11930 */ 11931 boolean isPaddingResolved() { 11932 return (mPrivateFlags2 & PFLAG2_PADDING_RESOLVED) == PFLAG2_PADDING_RESOLVED; 11933 } 11934 11935 /** 11936 * Resolve padding depending on layout direction. 11937 * 11938 * @hide 11939 */ 11940 public void resolvePadding() { 11941 if (!isRtlCompatibilityMode()) { 11942 // Post Jelly Bean MR1 case: we need to take the resolved layout direction into account. 11943 // If start / end padding are defined, they will be resolved (hence overriding) to 11944 // left / right or right / left depending on the resolved layout direction. 11945 // If start / end padding are not defined, use the left / right ones. 11946 int resolvedLayoutDirection = getLayoutDirection(); 11947 switch (resolvedLayoutDirection) { 11948 case LAYOUT_DIRECTION_RTL: 11949 if (mUserPaddingStart != UNDEFINED_PADDING) { 11950 mUserPaddingRight = mUserPaddingStart; 11951 } else { 11952 mUserPaddingRight = mUserPaddingRightInitial; 11953 } 11954 if (mUserPaddingEnd != UNDEFINED_PADDING) { 11955 mUserPaddingLeft = mUserPaddingEnd; 11956 } else { 11957 mUserPaddingLeft = mUserPaddingLeftInitial; 11958 } 11959 break; 11960 case LAYOUT_DIRECTION_LTR: 11961 default: 11962 if (mUserPaddingStart != UNDEFINED_PADDING) { 11963 mUserPaddingLeft = mUserPaddingStart; 11964 } else { 11965 mUserPaddingLeft = mUserPaddingLeftInitial; 11966 } 11967 if (mUserPaddingEnd != UNDEFINED_PADDING) { 11968 mUserPaddingRight = mUserPaddingEnd; 11969 } else { 11970 mUserPaddingRight = mUserPaddingRightInitial; 11971 } 11972 } 11973 11974 mUserPaddingBottom = (mUserPaddingBottom >= 0) ? mUserPaddingBottom : mPaddingBottom; 11975 11976 internalSetPadding(mUserPaddingLeft, mPaddingTop, mUserPaddingRight, 11977 mUserPaddingBottom); 11978 onRtlPropertiesChanged(resolvedLayoutDirection); 11979 } 11980 11981 mPrivateFlags2 |= PFLAG2_PADDING_RESOLVED; 11982 } 11983 11984 /** 11985 * Reset the resolved layout direction. 11986 * 11987 * @hide 11988 */ 11989 public void resetResolvedPadding() { 11990 mPrivateFlags2 &= ~PFLAG2_PADDING_RESOLVED; 11991 } 11992 11993 /** 11994 * This is called when the view is detached from a window. At this point it 11995 * no longer has a surface for drawing. 11996 * 11997 * @see #onAttachedToWindow() 11998 */ 11999 protected void onDetachedFromWindow() { 12000 mPrivateFlags &= ~PFLAG_CANCEL_NEXT_UP_EVENT; 12001 12002 removeUnsetPressCallback(); 12003 removeLongPressCallback(); 12004 removePerformClickCallback(); 12005 removeSendViewScrolledAccessibilityEventCallback(); 12006 12007 destroyDrawingCache(); 12008 12009 destroyLayer(false); 12010 12011 if (mAttachInfo != null) { 12012 if (mDisplayList != null) { 12013 mDisplayList.markDirty(); 12014 mAttachInfo.mViewRootImpl.enqueueDisplayList(mDisplayList); 12015 } 12016 mAttachInfo.mViewRootImpl.cancelInvalidate(this); 12017 } else { 12018 // Should never happen 12019 clearDisplayList(); 12020 } 12021 12022 mCurrentAnimation = null; 12023 12024 resetAccessibilityStateChanged(); 12025 } 12026 12027 /** 12028 * @return The number of times this view has been attached to a window 12029 */ 12030 protected int getWindowAttachCount() { 12031 return mWindowAttachCount; 12032 } 12033 12034 /** 12035 * Retrieve a unique token identifying the window this view is attached to. 12036 * @return Return the window's token for use in 12037 * {@link WindowManager.LayoutParams#token WindowManager.LayoutParams.token}. 12038 */ 12039 public IBinder getWindowToken() { 12040 return mAttachInfo != null ? mAttachInfo.mWindowToken : null; 12041 } 12042 12043 /** 12044 * Retrieve the {@link WindowId} for the window this view is 12045 * currently attached to. 12046 */ 12047 public WindowId getWindowId() { 12048 if (mAttachInfo == null) { 12049 return null; 12050 } 12051 if (mAttachInfo.mWindowId == null) { 12052 try { 12053 mAttachInfo.mIWindowId = mAttachInfo.mSession.getWindowId( 12054 mAttachInfo.mWindowToken); 12055 mAttachInfo.mWindowId = new WindowId( 12056 mAttachInfo.mIWindowId); 12057 } catch (RemoteException e) { 12058 } 12059 } 12060 return mAttachInfo.mWindowId; 12061 } 12062 12063 /** 12064 * Retrieve a unique token identifying the top-level "real" window of 12065 * the window that this view is attached to. That is, this is like 12066 * {@link #getWindowToken}, except if the window this view in is a panel 12067 * window (attached to another containing window), then the token of 12068 * the containing window is returned instead. 12069 * 12070 * @return Returns the associated window token, either 12071 * {@link #getWindowToken()} or the containing window's token. 12072 */ 12073 public IBinder getApplicationWindowToken() { 12074 AttachInfo ai = mAttachInfo; 12075 if (ai != null) { 12076 IBinder appWindowToken = ai.mPanelParentWindowToken; 12077 if (appWindowToken == null) { 12078 appWindowToken = ai.mWindowToken; 12079 } 12080 return appWindowToken; 12081 } 12082 return null; 12083 } 12084 12085 /** 12086 * Gets the logical display to which the view's window has been attached. 12087 * 12088 * @return The logical display, or null if the view is not currently attached to a window. 12089 */ 12090 public Display getDisplay() { 12091 return mAttachInfo != null ? mAttachInfo.mDisplay : null; 12092 } 12093 12094 /** 12095 * Retrieve private session object this view hierarchy is using to 12096 * communicate with the window manager. 12097 * @return the session object to communicate with the window manager 12098 */ 12099 /*package*/ IWindowSession getWindowSession() { 12100 return mAttachInfo != null ? mAttachInfo.mSession : null; 12101 } 12102 12103 /** 12104 * @param info the {@link android.view.View.AttachInfo} to associated with 12105 * this view 12106 */ 12107 void dispatchAttachedToWindow(AttachInfo info, int visibility) { 12108 //System.out.println("Attached! " + this); 12109 mAttachInfo = info; 12110 if (mOverlay != null) { 12111 mOverlay.getOverlayView().dispatchAttachedToWindow(info, visibility); 12112 } 12113 mWindowAttachCount++; 12114 // We will need to evaluate the drawable state at least once. 12115 mPrivateFlags |= PFLAG_DRAWABLE_STATE_DIRTY; 12116 if (mFloatingTreeObserver != null) { 12117 info.mTreeObserver.merge(mFloatingTreeObserver); 12118 mFloatingTreeObserver = null; 12119 } 12120 if ((mPrivateFlags&PFLAG_SCROLL_CONTAINER) != 0) { 12121 mAttachInfo.mScrollContainers.add(this); 12122 mPrivateFlags |= PFLAG_SCROLL_CONTAINER_ADDED; 12123 } 12124 performCollectViewAttributes(mAttachInfo, visibility); 12125 onAttachedToWindow(); 12126 12127 ListenerInfo li = mListenerInfo; 12128 final CopyOnWriteArrayList<OnAttachStateChangeListener> listeners = 12129 li != null ? li.mOnAttachStateChangeListeners : null; 12130 if (listeners != null && listeners.size() > 0) { 12131 // NOTE: because of the use of CopyOnWriteArrayList, we *must* use an iterator to 12132 // perform the dispatching. The iterator is a safe guard against listeners that 12133 // could mutate the list by calling the various add/remove methods. This prevents 12134 // the array from being modified while we iterate it. 12135 for (OnAttachStateChangeListener listener : listeners) { 12136 listener.onViewAttachedToWindow(this); 12137 } 12138 } 12139 12140 int vis = info.mWindowVisibility; 12141 if (vis != GONE) { 12142 onWindowVisibilityChanged(vis); 12143 } 12144 if ((mPrivateFlags&PFLAG_DRAWABLE_STATE_DIRTY) != 0) { 12145 // If nobody has evaluated the drawable state yet, then do it now. 12146 refreshDrawableState(); 12147 } 12148 needGlobalAttributesUpdate(false); 12149 } 12150 12151 void dispatchDetachedFromWindow() { 12152 AttachInfo info = mAttachInfo; 12153 if (info != null) { 12154 int vis = info.mWindowVisibility; 12155 if (vis != GONE) { 12156 onWindowVisibilityChanged(GONE); 12157 } 12158 } 12159 12160 onDetachedFromWindow(); 12161 12162 ListenerInfo li = mListenerInfo; 12163 final CopyOnWriteArrayList<OnAttachStateChangeListener> listeners = 12164 li != null ? li.mOnAttachStateChangeListeners : null; 12165 if (listeners != null && listeners.size() > 0) { 12166 // NOTE: because of the use of CopyOnWriteArrayList, we *must* use an iterator to 12167 // perform the dispatching. The iterator is a safe guard against listeners that 12168 // could mutate the list by calling the various add/remove methods. This prevents 12169 // the array from being modified while we iterate it. 12170 for (OnAttachStateChangeListener listener : listeners) { 12171 listener.onViewDetachedFromWindow(this); 12172 } 12173 } 12174 12175 if ((mPrivateFlags & PFLAG_SCROLL_CONTAINER_ADDED) != 0) { 12176 mAttachInfo.mScrollContainers.remove(this); 12177 mPrivateFlags &= ~PFLAG_SCROLL_CONTAINER_ADDED; 12178 } 12179 12180 mAttachInfo = null; 12181 if (mOverlay != null) { 12182 mOverlay.getOverlayView().dispatchDetachedFromWindow(); 12183 } 12184 } 12185 12186 /** 12187 * Store this view hierarchy's frozen state into the given container. 12188 * 12189 * @param container The SparseArray in which to save the view's state. 12190 * 12191 * @see #restoreHierarchyState(android.util.SparseArray) 12192 * @see #dispatchSaveInstanceState(android.util.SparseArray) 12193 * @see #onSaveInstanceState() 12194 */ 12195 public void saveHierarchyState(SparseArray<Parcelable> container) { 12196 dispatchSaveInstanceState(container); 12197 } 12198 12199 /** 12200 * Called by {@link #saveHierarchyState(android.util.SparseArray)} to store the state for 12201 * this view and its children. May be overridden to modify how freezing happens to a 12202 * view's children; for example, some views may want to not store state for their children. 12203 * 12204 * @param container The SparseArray in which to save the view's state. 12205 * 12206 * @see #dispatchRestoreInstanceState(android.util.SparseArray) 12207 * @see #saveHierarchyState(android.util.SparseArray) 12208 * @see #onSaveInstanceState() 12209 */ 12210 protected void dispatchSaveInstanceState(SparseArray<Parcelable> container) { 12211 if (mID != NO_ID && (mViewFlags & SAVE_DISABLED_MASK) == 0) { 12212 mPrivateFlags &= ~PFLAG_SAVE_STATE_CALLED; 12213 Parcelable state = onSaveInstanceState(); 12214 if ((mPrivateFlags & PFLAG_SAVE_STATE_CALLED) == 0) { 12215 throw new IllegalStateException( 12216 "Derived class did not call super.onSaveInstanceState()"); 12217 } 12218 if (state != null) { 12219 // Log.i("View", "Freezing #" + Integer.toHexString(mID) 12220 // + ": " + state); 12221 container.put(mID, state); 12222 } 12223 } 12224 } 12225 12226 /** 12227 * Hook allowing a view to generate a representation of its internal state 12228 * that can later be used to create a new instance with that same state. 12229 * This state should only contain information that is not persistent or can 12230 * not be reconstructed later. For example, you will never store your 12231 * current position on screen because that will be computed again when a 12232 * new instance of the view is placed in its view hierarchy. 12233 * <p> 12234 * Some examples of things you may store here: the current cursor position 12235 * in a text view (but usually not the text itself since that is stored in a 12236 * content provider or other persistent storage), the currently selected 12237 * item in a list view. 12238 * 12239 * @return Returns a Parcelable object containing the view's current dynamic 12240 * state, or null if there is nothing interesting to save. The 12241 * default implementation returns null. 12242 * @see #onRestoreInstanceState(android.os.Parcelable) 12243 * @see #saveHierarchyState(android.util.SparseArray) 12244 * @see #dispatchSaveInstanceState(android.util.SparseArray) 12245 * @see #setSaveEnabled(boolean) 12246 */ 12247 protected Parcelable onSaveInstanceState() { 12248 mPrivateFlags |= PFLAG_SAVE_STATE_CALLED; 12249 return BaseSavedState.EMPTY_STATE; 12250 } 12251 12252 /** 12253 * Restore this view hierarchy's frozen state from the given container. 12254 * 12255 * @param container The SparseArray which holds previously frozen states. 12256 * 12257 * @see #saveHierarchyState(android.util.SparseArray) 12258 * @see #dispatchRestoreInstanceState(android.util.SparseArray) 12259 * @see #onRestoreInstanceState(android.os.Parcelable) 12260 */ 12261 public void restoreHierarchyState(SparseArray<Parcelable> container) { 12262 dispatchRestoreInstanceState(container); 12263 } 12264 12265 /** 12266 * Called by {@link #restoreHierarchyState(android.util.SparseArray)} to retrieve the 12267 * state for this view and its children. May be overridden to modify how restoring 12268 * happens to a view's children; for example, some views may want to not store state 12269 * for their children. 12270 * 12271 * @param container The SparseArray which holds previously saved state. 12272 * 12273 * @see #dispatchSaveInstanceState(android.util.SparseArray) 12274 * @see #restoreHierarchyState(android.util.SparseArray) 12275 * @see #onRestoreInstanceState(android.os.Parcelable) 12276 */ 12277 protected void dispatchRestoreInstanceState(SparseArray<Parcelable> container) { 12278 if (mID != NO_ID) { 12279 Parcelable state = container.get(mID); 12280 if (state != null) { 12281 // Log.i("View", "Restoreing #" + Integer.toHexString(mID) 12282 // + ": " + state); 12283 mPrivateFlags &= ~PFLAG_SAVE_STATE_CALLED; 12284 onRestoreInstanceState(state); 12285 if ((mPrivateFlags & PFLAG_SAVE_STATE_CALLED) == 0) { 12286 throw new IllegalStateException( 12287 "Derived class did not call super.onRestoreInstanceState()"); 12288 } 12289 } 12290 } 12291 } 12292 12293 /** 12294 * Hook allowing a view to re-apply a representation of its internal state that had previously 12295 * been generated by {@link #onSaveInstanceState}. This function will never be called with a 12296 * null state. 12297 * 12298 * @param state The frozen state that had previously been returned by 12299 * {@link #onSaveInstanceState}. 12300 * 12301 * @see #onSaveInstanceState() 12302 * @see #restoreHierarchyState(android.util.SparseArray) 12303 * @see #dispatchRestoreInstanceState(android.util.SparseArray) 12304 */ 12305 protected void onRestoreInstanceState(Parcelable state) { 12306 mPrivateFlags |= PFLAG_SAVE_STATE_CALLED; 12307 if (state != BaseSavedState.EMPTY_STATE && state != null) { 12308 throw new IllegalArgumentException("Wrong state class, expecting View State but " 12309 + "received " + state.getClass().toString() + " instead. This usually happens " 12310 + "when two views of different type have the same id in the same hierarchy. " 12311 + "This view's id is " + ViewDebug.resolveId(mContext, getId()) + ". Make sure " 12312 + "other views do not use the same id."); 12313 } 12314 } 12315 12316 /** 12317 * <p>Return the time at which the drawing of the view hierarchy started.</p> 12318 * 12319 * @return the drawing start time in milliseconds 12320 */ 12321 public long getDrawingTime() { 12322 return mAttachInfo != null ? mAttachInfo.mDrawingTime : 0; 12323 } 12324 12325 /** 12326 * <p>Enables or disables the duplication of the parent's state into this view. When 12327 * duplication is enabled, this view gets its drawable state from its parent rather 12328 * than from its own internal properties.</p> 12329 * 12330 * <p>Note: in the current implementation, setting this property to true after the 12331 * view was added to a ViewGroup might have no effect at all. This property should 12332 * always be used from XML or set to true before adding this view to a ViewGroup.</p> 12333 * 12334 * <p>Note: if this view's parent addStateFromChildren property is enabled and this 12335 * property is enabled, an exception will be thrown.</p> 12336 * 12337 * <p>Note: if the child view uses and updates additionnal states which are unknown to the 12338 * parent, these states should not be affected by this method.</p> 12339 * 12340 * @param enabled True to enable duplication of the parent's drawable state, false 12341 * to disable it. 12342 * 12343 * @see #getDrawableState() 12344 * @see #isDuplicateParentStateEnabled() 12345 */ 12346 public void setDuplicateParentStateEnabled(boolean enabled) { 12347 setFlags(enabled ? DUPLICATE_PARENT_STATE : 0, DUPLICATE_PARENT_STATE); 12348 } 12349 12350 /** 12351 * <p>Indicates whether this duplicates its drawable state from its parent.</p> 12352 * 12353 * @return True if this view's drawable state is duplicated from the parent, 12354 * false otherwise 12355 * 12356 * @see #getDrawableState() 12357 * @see #setDuplicateParentStateEnabled(boolean) 12358 */ 12359 public boolean isDuplicateParentStateEnabled() { 12360 return (mViewFlags & DUPLICATE_PARENT_STATE) == DUPLICATE_PARENT_STATE; 12361 } 12362 12363 /** 12364 * <p>Specifies the type of layer backing this view. The layer can be 12365 * {@link #LAYER_TYPE_NONE}, {@link #LAYER_TYPE_SOFTWARE} or 12366 * {@link #LAYER_TYPE_HARDWARE}.</p> 12367 * 12368 * <p>A layer is associated with an optional {@link android.graphics.Paint} 12369 * instance that controls how the layer is composed on screen. The following 12370 * properties of the paint are taken into account when composing the layer:</p> 12371 * <ul> 12372 * <li>{@link android.graphics.Paint#getAlpha() Translucency (alpha)}</li> 12373 * <li>{@link android.graphics.Paint#getXfermode() Blending mode}</li> 12374 * <li>{@link android.graphics.Paint#getColorFilter() Color filter}</li> 12375 * </ul> 12376 * 12377 * <p>If this view has an alpha value set to < 1.0 by calling 12378 * {@link #setAlpha(float)}, the alpha value of the layer's paint is superceded 12379 * by this view's alpha value.</p> 12380 * 12381 * <p>Refer to the documentation of {@link #LAYER_TYPE_NONE}, 12382 * {@link #LAYER_TYPE_SOFTWARE} and {@link #LAYER_TYPE_HARDWARE} 12383 * for more information on when and how to use layers.</p> 12384 * 12385 * @param layerType The type of layer to use with this view, must be one of 12386 * {@link #LAYER_TYPE_NONE}, {@link #LAYER_TYPE_SOFTWARE} or 12387 * {@link #LAYER_TYPE_HARDWARE} 12388 * @param paint The paint used to compose the layer. This argument is optional 12389 * and can be null. It is ignored when the layer type is 12390 * {@link #LAYER_TYPE_NONE} 12391 * 12392 * @see #getLayerType() 12393 * @see #LAYER_TYPE_NONE 12394 * @see #LAYER_TYPE_SOFTWARE 12395 * @see #LAYER_TYPE_HARDWARE 12396 * @see #setAlpha(float) 12397 * 12398 * @attr ref android.R.styleable#View_layerType 12399 */ 12400 public void setLayerType(int layerType, Paint paint) { 12401 if (layerType < LAYER_TYPE_NONE || layerType > LAYER_TYPE_HARDWARE) { 12402 throw new IllegalArgumentException("Layer type can only be one of: LAYER_TYPE_NONE, " 12403 + "LAYER_TYPE_SOFTWARE or LAYER_TYPE_HARDWARE"); 12404 } 12405 12406 if (layerType == mLayerType) { 12407 if (layerType != LAYER_TYPE_NONE && paint != mLayerPaint) { 12408 mLayerPaint = paint == null ? new Paint() : paint; 12409 invalidateParentCaches(); 12410 invalidate(true); 12411 } 12412 return; 12413 } 12414 12415 // Destroy any previous software drawing cache if needed 12416 switch (mLayerType) { 12417 case LAYER_TYPE_HARDWARE: 12418 destroyLayer(false); 12419 // fall through - non-accelerated views may use software layer mechanism instead 12420 case LAYER_TYPE_SOFTWARE: 12421 destroyDrawingCache(); 12422 break; 12423 default: 12424 break; 12425 } 12426 12427 mLayerType = layerType; 12428 final boolean layerDisabled = mLayerType == LAYER_TYPE_NONE; 12429 mLayerPaint = layerDisabled ? null : (paint == null ? new Paint() : paint); 12430 mLocalDirtyRect = layerDisabled ? null : new Rect(); 12431 12432 invalidateParentCaches(); 12433 invalidate(true); 12434 } 12435 12436 /** 12437 * Updates the {@link Paint} object used with the current layer (used only if the current 12438 * layer type is not set to {@link #LAYER_TYPE_NONE}). Changed properties of the Paint 12439 * provided to {@link #setLayerType(int, android.graphics.Paint)} will be used the next time 12440 * the View is redrawn, but {@link #setLayerPaint(android.graphics.Paint)} must be called to 12441 * ensure that the view gets redrawn immediately. 12442 * 12443 * <p>A layer is associated with an optional {@link android.graphics.Paint} 12444 * instance that controls how the layer is composed on screen. The following 12445 * properties of the paint are taken into account when composing the layer:</p> 12446 * <ul> 12447 * <li>{@link android.graphics.Paint#getAlpha() Translucency (alpha)}</li> 12448 * <li>{@link android.graphics.Paint#getXfermode() Blending mode}</li> 12449 * <li>{@link android.graphics.Paint#getColorFilter() Color filter}</li> 12450 * </ul> 12451 * 12452 * <p>If this view has an alpha value set to < 1.0 by calling {@link #setAlpha(float)}, the 12453 * alpha value of the layer's paint is superceded by this view's alpha value.</p> 12454 * 12455 * @param paint The paint used to compose the layer. This argument is optional 12456 * and can be null. It is ignored when the layer type is 12457 * {@link #LAYER_TYPE_NONE} 12458 * 12459 * @see #setLayerType(int, android.graphics.Paint) 12460 */ 12461 public void setLayerPaint(Paint paint) { 12462 int layerType = getLayerType(); 12463 if (layerType != LAYER_TYPE_NONE) { 12464 mLayerPaint = paint == null ? new Paint() : paint; 12465 if (layerType == LAYER_TYPE_HARDWARE) { 12466 HardwareLayer layer = getHardwareLayer(); 12467 if (layer != null) { 12468 layer.setLayerPaint(paint); 12469 } 12470 invalidateViewProperty(false, false); 12471 } else { 12472 invalidate(); 12473 } 12474 } 12475 } 12476 12477 /** 12478 * Indicates whether this view has a static layer. A view with layer type 12479 * {@link #LAYER_TYPE_NONE} is a static layer. Other types of layers are 12480 * dynamic. 12481 */ 12482 boolean hasStaticLayer() { 12483 return true; 12484 } 12485 12486 /** 12487 * Indicates what type of layer is currently associated with this view. By default 12488 * a view does not have a layer, and the layer type is {@link #LAYER_TYPE_NONE}. 12489 * Refer to the documentation of {@link #setLayerType(int, android.graphics.Paint)} 12490 * for more information on the different types of layers. 12491 * 12492 * @return {@link #LAYER_TYPE_NONE}, {@link #LAYER_TYPE_SOFTWARE} or 12493 * {@link #LAYER_TYPE_HARDWARE} 12494 * 12495 * @see #setLayerType(int, android.graphics.Paint) 12496 * @see #buildLayer() 12497 * @see #LAYER_TYPE_NONE 12498 * @see #LAYER_TYPE_SOFTWARE 12499 * @see #LAYER_TYPE_HARDWARE 12500 */ 12501 public int getLayerType() { 12502 return mLayerType; 12503 } 12504 12505 /** 12506 * Forces this view's layer to be created and this view to be rendered 12507 * into its layer. If this view's layer type is set to {@link #LAYER_TYPE_NONE}, 12508 * invoking this method will have no effect. 12509 * 12510 * This method can for instance be used to render a view into its layer before 12511 * starting an animation. If this view is complex, rendering into the layer 12512 * before starting the animation will avoid skipping frames. 12513 * 12514 * @throws IllegalStateException If this view is not attached to a window 12515 * 12516 * @see #setLayerType(int, android.graphics.Paint) 12517 */ 12518 public void buildLayer() { 12519 if (mLayerType == LAYER_TYPE_NONE) return; 12520 12521 if (mAttachInfo == null) { 12522 throw new IllegalStateException("This view must be attached to a window first"); 12523 } 12524 12525 switch (mLayerType) { 12526 case LAYER_TYPE_HARDWARE: 12527 if (mAttachInfo.mHardwareRenderer != null && 12528 mAttachInfo.mHardwareRenderer.isEnabled() && 12529 mAttachInfo.mHardwareRenderer.validate()) { 12530 getHardwareLayer(); 12531 } 12532 break; 12533 case LAYER_TYPE_SOFTWARE: 12534 buildDrawingCache(true); 12535 break; 12536 } 12537 } 12538 12539 /** 12540 * <p>Returns a hardware layer that can be used to draw this view again 12541 * without executing its draw method.</p> 12542 * 12543 * @return A HardwareLayer ready to render, or null if an error occurred. 12544 */ 12545 HardwareLayer getHardwareLayer() { 12546 if (mAttachInfo == null || mAttachInfo.mHardwareRenderer == null || 12547 !mAttachInfo.mHardwareRenderer.isEnabled()) { 12548 return null; 12549 } 12550 12551 if (!mAttachInfo.mHardwareRenderer.validate()) return null; 12552 12553 final int width = mRight - mLeft; 12554 final int height = mBottom - mTop; 12555 12556 if (width == 0 || height == 0) { 12557 return null; 12558 } 12559 12560 if ((mPrivateFlags & PFLAG_DRAWING_CACHE_VALID) == 0 || mHardwareLayer == null) { 12561 if (mHardwareLayer == null) { 12562 mHardwareLayer = mAttachInfo.mHardwareRenderer.createHardwareLayer( 12563 width, height, isOpaque()); 12564 mLocalDirtyRect.set(0, 0, width, height); 12565 } else { 12566 if (mHardwareLayer.getWidth() != width || mHardwareLayer.getHeight() != height) { 12567 if (mHardwareLayer.resize(width, height)) { 12568 mLocalDirtyRect.set(0, 0, width, height); 12569 } 12570 } 12571 12572 // This should not be necessary but applications that change 12573 // the parameters of their background drawable without calling 12574 // this.setBackground(Drawable) can leave the view in a bad state 12575 // (for instance isOpaque() returns true, but the background is 12576 // not opaque.) 12577 computeOpaqueFlags(); 12578 12579 final boolean opaque = isOpaque(); 12580 if (mHardwareLayer.isValid() && mHardwareLayer.isOpaque() != opaque) { 12581 mHardwareLayer.setOpaque(opaque); 12582 mLocalDirtyRect.set(0, 0, width, height); 12583 } 12584 } 12585 12586 // The layer is not valid if the underlying GPU resources cannot be allocated 12587 if (!mHardwareLayer.isValid()) { 12588 return null; 12589 } 12590 12591 mHardwareLayer.setLayerPaint(mLayerPaint); 12592 mHardwareLayer.redrawLater(getHardwareLayerDisplayList(mHardwareLayer), mLocalDirtyRect); 12593 ViewRootImpl viewRoot = getViewRootImpl(); 12594 if (viewRoot != null) viewRoot.pushHardwareLayerUpdate(mHardwareLayer); 12595 12596 mLocalDirtyRect.setEmpty(); 12597 } 12598 12599 return mHardwareLayer; 12600 } 12601 12602 /** 12603 * Destroys this View's hardware layer if possible. 12604 * 12605 * @return True if the layer was destroyed, false otherwise. 12606 * 12607 * @see #setLayerType(int, android.graphics.Paint) 12608 * @see #LAYER_TYPE_HARDWARE 12609 */ 12610 boolean destroyLayer(boolean valid) { 12611 if (mHardwareLayer != null) { 12612 AttachInfo info = mAttachInfo; 12613 if (info != null && info.mHardwareRenderer != null && 12614 info.mHardwareRenderer.isEnabled() && 12615 (valid || info.mHardwareRenderer.validate())) { 12616 mHardwareLayer.destroy(); 12617 mHardwareLayer = null; 12618 12619 if (mDisplayList != null) { 12620 mDisplayList.reset(); 12621 } 12622 invalidate(true); 12623 invalidateParentCaches(); 12624 } 12625 return true; 12626 } 12627 return false; 12628 } 12629 12630 /** 12631 * Destroys all hardware rendering resources. This method is invoked 12632 * when the system needs to reclaim resources. Upon execution of this 12633 * method, you should free any OpenGL resources created by the view. 12634 * 12635 * Note: you <strong>must</strong> call 12636 * <code>super.destroyHardwareResources()</code> when overriding 12637 * this method. 12638 * 12639 * @hide 12640 */ 12641 protected void destroyHardwareResources() { 12642 destroyLayer(true); 12643 } 12644 12645 /** 12646 * <p>Enables or disables the drawing cache. When the drawing cache is enabled, the next call 12647 * to {@link #getDrawingCache()} or {@link #buildDrawingCache()} will draw the view in a 12648 * bitmap. Calling {@link #draw(android.graphics.Canvas)} will not draw from the cache when 12649 * the cache is enabled. To benefit from the cache, you must request the drawing cache by 12650 * calling {@link #getDrawingCache()} and draw it on screen if the returned bitmap is not 12651 * null.</p> 12652 * 12653 * <p>Enabling the drawing cache is similar to 12654 * {@link #setLayerType(int, android.graphics.Paint) setting a layer} when hardware 12655 * acceleration is turned off. When hardware acceleration is turned on, enabling the 12656 * drawing cache has no effect on rendering because the system uses a different mechanism 12657 * for acceleration which ignores the flag. If you want to use a Bitmap for the view, even 12658 * when hardware acceleration is enabled, see {@link #setLayerType(int, android.graphics.Paint)} 12659 * for information on how to enable software and hardware layers.</p> 12660 * 12661 * <p>This API can be used to manually generate 12662 * a bitmap copy of this view, by setting the flag to <code>true</code> and calling 12663 * {@link #getDrawingCache()}.</p> 12664 * 12665 * @param enabled true to enable the drawing cache, false otherwise 12666 * 12667 * @see #isDrawingCacheEnabled() 12668 * @see #getDrawingCache() 12669 * @see #buildDrawingCache() 12670 * @see #setLayerType(int, android.graphics.Paint) 12671 */ 12672 public void setDrawingCacheEnabled(boolean enabled) { 12673 mCachingFailed = false; 12674 setFlags(enabled ? DRAWING_CACHE_ENABLED : 0, DRAWING_CACHE_ENABLED); 12675 } 12676 12677 /** 12678 * <p>Indicates whether the drawing cache is enabled for this view.</p> 12679 * 12680 * @return true if the drawing cache is enabled 12681 * 12682 * @see #setDrawingCacheEnabled(boolean) 12683 * @see #getDrawingCache() 12684 */ 12685 @ViewDebug.ExportedProperty(category = "drawing") 12686 public boolean isDrawingCacheEnabled() { 12687 return (mViewFlags & DRAWING_CACHE_ENABLED) == DRAWING_CACHE_ENABLED; 12688 } 12689 12690 /** 12691 * Debugging utility which recursively outputs the dirty state of a view and its 12692 * descendants. 12693 * 12694 * @hide 12695 */ 12696 @SuppressWarnings({"UnusedDeclaration"}) 12697 public void outputDirtyFlags(String indent, boolean clear, int clearMask) { 12698 Log.d("View", indent + this + " DIRTY(" + (mPrivateFlags & View.PFLAG_DIRTY_MASK) + 12699 ") DRAWN(" + (mPrivateFlags & PFLAG_DRAWN) + ")" + " CACHE_VALID(" + 12700 (mPrivateFlags & View.PFLAG_DRAWING_CACHE_VALID) + 12701 ") INVALIDATED(" + (mPrivateFlags & PFLAG_INVALIDATED) + ")"); 12702 if (clear) { 12703 mPrivateFlags &= clearMask; 12704 } 12705 if (this instanceof ViewGroup) { 12706 ViewGroup parent = (ViewGroup) this; 12707 final int count = parent.getChildCount(); 12708 for (int i = 0; i < count; i++) { 12709 final View child = parent.getChildAt(i); 12710 child.outputDirtyFlags(indent + " ", clear, clearMask); 12711 } 12712 } 12713 } 12714 12715 /** 12716 * This method is used by ViewGroup to cause its children to restore or recreate their 12717 * display lists. It is called by getDisplayList() when the parent ViewGroup does not need 12718 * to recreate its own display list, which would happen if it went through the normal 12719 * draw/dispatchDraw mechanisms. 12720 * 12721 * @hide 12722 */ 12723 protected void dispatchGetDisplayList() {} 12724 12725 /** 12726 * A view that is not attached or hardware accelerated cannot create a display list. 12727 * This method checks these conditions and returns the appropriate result. 12728 * 12729 * @return true if view has the ability to create a display list, false otherwise. 12730 * 12731 * @hide 12732 */ 12733 public boolean canHaveDisplayList() { 12734 return !(mAttachInfo == null || mAttachInfo.mHardwareRenderer == null); 12735 } 12736 12737 /** 12738 * @return The {@link HardwareRenderer} associated with that view or null if 12739 * hardware rendering is not supported or this view is not attached 12740 * to a window. 12741 * 12742 * @hide 12743 */ 12744 public HardwareRenderer getHardwareRenderer() { 12745 if (mAttachInfo != null) { 12746 return mAttachInfo.mHardwareRenderer; 12747 } 12748 return null; 12749 } 12750 12751 /** 12752 * Returns a DisplayList. If the incoming displayList is null, one will be created. 12753 * Otherwise, the same display list will be returned (after having been rendered into 12754 * along the way, depending on the invalidation state of the view). 12755 * 12756 * @param displayList The previous version of this displayList, could be null. 12757 * @param isLayer Whether the requester of the display list is a layer. If so, 12758 * the view will avoid creating a layer inside the resulting display list. 12759 * @return A new or reused DisplayList object. 12760 */ 12761 private DisplayList getDisplayList(DisplayList displayList, boolean isLayer) { 12762 if (!canHaveDisplayList()) { 12763 return null; 12764 } 12765 12766 if (((mPrivateFlags & PFLAG_DRAWING_CACHE_VALID) == 0 || 12767 displayList == null || !displayList.isValid() || 12768 (!isLayer && mRecreateDisplayList))) { 12769 // Don't need to recreate the display list, just need to tell our 12770 // children to restore/recreate theirs 12771 if (displayList != null && displayList.isValid() && 12772 !isLayer && !mRecreateDisplayList) { 12773 mPrivateFlags |= PFLAG_DRAWN | PFLAG_DRAWING_CACHE_VALID; 12774 mPrivateFlags &= ~PFLAG_DIRTY_MASK; 12775 dispatchGetDisplayList(); 12776 12777 return displayList; 12778 } 12779 12780 if (!isLayer) { 12781 // If we got here, we're recreating it. Mark it as such to ensure that 12782 // we copy in child display lists into ours in drawChild() 12783 mRecreateDisplayList = true; 12784 } 12785 if (displayList == null) { 12786 final String name = getClass().getSimpleName(); 12787 displayList = mAttachInfo.mHardwareRenderer.createDisplayList(name); 12788 // If we're creating a new display list, make sure our parent gets invalidated 12789 // since they will need to recreate their display list to account for this 12790 // new child display list. 12791 invalidateParentCaches(); 12792 } 12793 12794 boolean caching = false; 12795 int width = mRight - mLeft; 12796 int height = mBottom - mTop; 12797 int layerType = getLayerType(); 12798 12799 final HardwareCanvas canvas = displayList.start(width, height); 12800 12801 try { 12802 if (!isLayer && layerType != LAYER_TYPE_NONE) { 12803 if (layerType == LAYER_TYPE_HARDWARE) { 12804 final HardwareLayer layer = getHardwareLayer(); 12805 if (layer != null && layer.isValid()) { 12806 canvas.drawHardwareLayer(layer, 0, 0, mLayerPaint); 12807 } else { 12808 canvas.saveLayer(0, 0, mRight - mLeft, mBottom - mTop, mLayerPaint, 12809 Canvas.HAS_ALPHA_LAYER_SAVE_FLAG | 12810 Canvas.CLIP_TO_LAYER_SAVE_FLAG); 12811 } 12812 caching = true; 12813 } else { 12814 buildDrawingCache(true); 12815 Bitmap cache = getDrawingCache(true); 12816 if (cache != null) { 12817 canvas.drawBitmap(cache, 0, 0, mLayerPaint); 12818 caching = true; 12819 } 12820 } 12821 } else { 12822 12823 computeScroll(); 12824 12825 canvas.translate(-mScrollX, -mScrollY); 12826 if (!isLayer) { 12827 mPrivateFlags |= PFLAG_DRAWN | PFLAG_DRAWING_CACHE_VALID; 12828 mPrivateFlags &= ~PFLAG_DIRTY_MASK; 12829 } 12830 12831 // Fast path for layouts with no backgrounds 12832 if ((mPrivateFlags & PFLAG_SKIP_DRAW) == PFLAG_SKIP_DRAW) { 12833 dispatchDraw(canvas); 12834 if (mOverlay != null && !mOverlay.isEmpty()) { 12835 mOverlay.getOverlayView().draw(canvas); 12836 } 12837 } else { 12838 draw(canvas); 12839 } 12840 } 12841 } finally { 12842 displayList.end(); 12843 displayList.setCaching(caching); 12844 if (isLayer) { 12845 displayList.setLeftTopRightBottom(0, 0, width, height); 12846 } else { 12847 setDisplayListProperties(displayList); 12848 } 12849 } 12850 } else if (!isLayer) { 12851 mPrivateFlags |= PFLAG_DRAWN | PFLAG_DRAWING_CACHE_VALID; 12852 mPrivateFlags &= ~PFLAG_DIRTY_MASK; 12853 } 12854 12855 return displayList; 12856 } 12857 12858 /** 12859 * Get the DisplayList for the HardwareLayer 12860 * 12861 * @param layer The HardwareLayer whose DisplayList we want 12862 * @return A DisplayList fopr the specified HardwareLayer 12863 */ 12864 private DisplayList getHardwareLayerDisplayList(HardwareLayer layer) { 12865 DisplayList displayList = getDisplayList(layer.getDisplayList(), true); 12866 layer.setDisplayList(displayList); 12867 return displayList; 12868 } 12869 12870 12871 /** 12872 * <p>Returns a display list that can be used to draw this view again 12873 * without executing its draw method.</p> 12874 * 12875 * @return A DisplayList ready to replay, or null if caching is not enabled. 12876 * 12877 * @hide 12878 */ 12879 public DisplayList getDisplayList() { 12880 mDisplayList = getDisplayList(mDisplayList, false); 12881 return mDisplayList; 12882 } 12883 12884 private void clearDisplayList() { 12885 if (mDisplayList != null) { 12886 mDisplayList.clear(); 12887 } 12888 } 12889 12890 /** 12891 * <p>Calling this method is equivalent to calling <code>getDrawingCache(false)</code>.</p> 12892 * 12893 * @return A non-scaled bitmap representing this view or null if cache is disabled. 12894 * 12895 * @see #getDrawingCache(boolean) 12896 */ 12897 public Bitmap getDrawingCache() { 12898 return getDrawingCache(false); 12899 } 12900 12901 /** 12902 * <p>Returns the bitmap in which this view drawing is cached. The returned bitmap 12903 * is null when caching is disabled. If caching is enabled and the cache is not ready, 12904 * this method will create it. Calling {@link #draw(android.graphics.Canvas)} will not 12905 * draw from the cache when the cache is enabled. To benefit from the cache, you must 12906 * request the drawing cache by calling this method and draw it on screen if the 12907 * returned bitmap is not null.</p> 12908 * 12909 * <p>Note about auto scaling in compatibility mode: When auto scaling is not enabled, 12910 * this method will create a bitmap of the same size as this view. Because this bitmap 12911 * will be drawn scaled by the parent ViewGroup, the result on screen might show 12912 * scaling artifacts. To avoid such artifacts, you should call this method by setting 12913 * the auto scaling to true. Doing so, however, will generate a bitmap of a different 12914 * size than the view. This implies that your application must be able to handle this 12915 * size.</p> 12916 * 12917 * @param autoScale Indicates whether the generated bitmap should be scaled based on 12918 * the current density of the screen when the application is in compatibility 12919 * mode. 12920 * 12921 * @return A bitmap representing this view or null if cache is disabled. 12922 * 12923 * @see #setDrawingCacheEnabled(boolean) 12924 * @see #isDrawingCacheEnabled() 12925 * @see #buildDrawingCache(boolean) 12926 * @see #destroyDrawingCache() 12927 */ 12928 public Bitmap getDrawingCache(boolean autoScale) { 12929 if ((mViewFlags & WILL_NOT_CACHE_DRAWING) == WILL_NOT_CACHE_DRAWING) { 12930 return null; 12931 } 12932 if ((mViewFlags & DRAWING_CACHE_ENABLED) == DRAWING_CACHE_ENABLED) { 12933 buildDrawingCache(autoScale); 12934 } 12935 return autoScale ? mDrawingCache : mUnscaledDrawingCache; 12936 } 12937 12938 /** 12939 * <p>Frees the resources used by the drawing cache. If you call 12940 * {@link #buildDrawingCache()} manually without calling 12941 * {@link #setDrawingCacheEnabled(boolean) setDrawingCacheEnabled(true)}, you 12942 * should cleanup the cache with this method afterwards.</p> 12943 * 12944 * @see #setDrawingCacheEnabled(boolean) 12945 * @see #buildDrawingCache() 12946 * @see #getDrawingCache() 12947 */ 12948 public void destroyDrawingCache() { 12949 if (mDrawingCache != null) { 12950 mDrawingCache.recycle(); 12951 mDrawingCache = null; 12952 } 12953 if (mUnscaledDrawingCache != null) { 12954 mUnscaledDrawingCache.recycle(); 12955 mUnscaledDrawingCache = null; 12956 } 12957 } 12958 12959 /** 12960 * Setting a solid background color for the drawing cache's bitmaps will improve 12961 * performance and memory usage. Note, though that this should only be used if this 12962 * view will always be drawn on top of a solid color. 12963 * 12964 * @param color The background color to use for the drawing cache's bitmap 12965 * 12966 * @see #setDrawingCacheEnabled(boolean) 12967 * @see #buildDrawingCache() 12968 * @see #getDrawingCache() 12969 */ 12970 public void setDrawingCacheBackgroundColor(int color) { 12971 if (color != mDrawingCacheBackgroundColor) { 12972 mDrawingCacheBackgroundColor = color; 12973 mPrivateFlags &= ~PFLAG_DRAWING_CACHE_VALID; 12974 } 12975 } 12976 12977 /** 12978 * @see #setDrawingCacheBackgroundColor(int) 12979 * 12980 * @return The background color to used for the drawing cache's bitmap 12981 */ 12982 public int getDrawingCacheBackgroundColor() { 12983 return mDrawingCacheBackgroundColor; 12984 } 12985 12986 /** 12987 * <p>Calling this method is equivalent to calling <code>buildDrawingCache(false)</code>.</p> 12988 * 12989 * @see #buildDrawingCache(boolean) 12990 */ 12991 public void buildDrawingCache() { 12992 buildDrawingCache(false); 12993 } 12994 12995 /** 12996 * <p>Forces the drawing cache to be built if the drawing cache is invalid.</p> 12997 * 12998 * <p>If you call {@link #buildDrawingCache()} manually without calling 12999 * {@link #setDrawingCacheEnabled(boolean) setDrawingCacheEnabled(true)}, you 13000 * should cleanup the cache by calling {@link #destroyDrawingCache()} afterwards.</p> 13001 * 13002 * <p>Note about auto scaling in compatibility mode: When auto scaling is not enabled, 13003 * this method will create a bitmap of the same size as this view. Because this bitmap 13004 * will be drawn scaled by the parent ViewGroup, the result on screen might show 13005 * scaling artifacts. To avoid such artifacts, you should call this method by setting 13006 * the auto scaling to true. Doing so, however, will generate a bitmap of a different 13007 * size than the view. This implies that your application must be able to handle this 13008 * size.</p> 13009 * 13010 * <p>You should avoid calling this method when hardware acceleration is enabled. If 13011 * you do not need the drawing cache bitmap, calling this method will increase memory 13012 * usage and cause the view to be rendered in software once, thus negatively impacting 13013 * performance.</p> 13014 * 13015 * @see #getDrawingCache() 13016 * @see #destroyDrawingCache() 13017 */ 13018 public void buildDrawingCache(boolean autoScale) { 13019 if ((mPrivateFlags & PFLAG_DRAWING_CACHE_VALID) == 0 || (autoScale ? 13020 mDrawingCache == null : mUnscaledDrawingCache == null)) { 13021 mCachingFailed = false; 13022 13023 int width = mRight - mLeft; 13024 int height = mBottom - mTop; 13025 13026 final AttachInfo attachInfo = mAttachInfo; 13027 final boolean scalingRequired = attachInfo != null && attachInfo.mScalingRequired; 13028 13029 if (autoScale && scalingRequired) { 13030 width = (int) ((width * attachInfo.mApplicationScale) + 0.5f); 13031 height = (int) ((height * attachInfo.mApplicationScale) + 0.5f); 13032 } 13033 13034 final int drawingCacheBackgroundColor = mDrawingCacheBackgroundColor; 13035 final boolean opaque = drawingCacheBackgroundColor != 0 || isOpaque(); 13036 final boolean use32BitCache = attachInfo != null && attachInfo.mUse32BitDrawingCache; 13037 13038 final long projectedBitmapSize = width * height * (opaque && !use32BitCache ? 2 : 4); 13039 final long drawingCacheSize = 13040 ViewConfiguration.get(mContext).getScaledMaximumDrawingCacheSize(); 13041 if (width <= 0 || height <= 0 || projectedBitmapSize > drawingCacheSize) { 13042 if (width > 0 && height > 0) { 13043 Log.w(VIEW_LOG_TAG, "View too large to fit into drawing cache, needs " 13044 + projectedBitmapSize + " bytes, only " 13045 + drawingCacheSize + " available"); 13046 } 13047 destroyDrawingCache(); 13048 mCachingFailed = true; 13049 return; 13050 } 13051 13052 boolean clear = true; 13053 Bitmap bitmap = autoScale ? mDrawingCache : mUnscaledDrawingCache; 13054 13055 if (bitmap == null || bitmap.getWidth() != width || bitmap.getHeight() != height) { 13056 Bitmap.Config quality; 13057 if (!opaque) { 13058 // Never pick ARGB_4444 because it looks awful 13059 // Keep the DRAWING_CACHE_QUALITY_LOW flag just in case 13060 switch (mViewFlags & DRAWING_CACHE_QUALITY_MASK) { 13061 case DRAWING_CACHE_QUALITY_AUTO: 13062 quality = Bitmap.Config.ARGB_8888; 13063 break; 13064 case DRAWING_CACHE_QUALITY_LOW: 13065 quality = Bitmap.Config.ARGB_8888; 13066 break; 13067 case DRAWING_CACHE_QUALITY_HIGH: 13068 quality = Bitmap.Config.ARGB_8888; 13069 break; 13070 default: 13071 quality = Bitmap.Config.ARGB_8888; 13072 break; 13073 } 13074 } else { 13075 // Optimization for translucent windows 13076 // If the window is translucent, use a 32 bits bitmap to benefit from memcpy() 13077 quality = use32BitCache ? Bitmap.Config.ARGB_8888 : Bitmap.Config.RGB_565; 13078 } 13079 13080 // Try to cleanup memory 13081 if (bitmap != null) bitmap.recycle(); 13082 13083 try { 13084 bitmap = Bitmap.createBitmap(mResources.getDisplayMetrics(), 13085 width, height, quality); 13086 bitmap.setDensity(getResources().getDisplayMetrics().densityDpi); 13087 if (autoScale) { 13088 mDrawingCache = bitmap; 13089 } else { 13090 mUnscaledDrawingCache = bitmap; 13091 } 13092 if (opaque && use32BitCache) bitmap.setHasAlpha(false); 13093 } catch (OutOfMemoryError e) { 13094 // If there is not enough memory to create the bitmap cache, just 13095 // ignore the issue as bitmap caches are not required to draw the 13096 // view hierarchy 13097 if (autoScale) { 13098 mDrawingCache = null; 13099 } else { 13100 mUnscaledDrawingCache = null; 13101 } 13102 mCachingFailed = true; 13103 return; 13104 } 13105 13106 clear = drawingCacheBackgroundColor != 0; 13107 } 13108 13109 Canvas canvas; 13110 if (attachInfo != null) { 13111 canvas = attachInfo.mCanvas; 13112 if (canvas == null) { 13113 canvas = new Canvas(); 13114 } 13115 canvas.setBitmap(bitmap); 13116 // Temporarily clobber the cached Canvas in case one of our children 13117 // is also using a drawing cache. Without this, the children would 13118 // steal the canvas by attaching their own bitmap to it and bad, bad 13119 // thing would happen (invisible views, corrupted drawings, etc.) 13120 attachInfo.mCanvas = null; 13121 } else { 13122 // This case should hopefully never or seldom happen 13123 canvas = new Canvas(bitmap); 13124 } 13125 13126 if (clear) { 13127 bitmap.eraseColor(drawingCacheBackgroundColor); 13128 } 13129 13130 computeScroll(); 13131 final int restoreCount = canvas.save(); 13132 13133 if (autoScale && scalingRequired) { 13134 final float scale = attachInfo.mApplicationScale; 13135 canvas.scale(scale, scale); 13136 } 13137 13138 canvas.translate(-mScrollX, -mScrollY); 13139 13140 mPrivateFlags |= PFLAG_DRAWN; 13141 if (mAttachInfo == null || !mAttachInfo.mHardwareAccelerated || 13142 mLayerType != LAYER_TYPE_NONE) { 13143 mPrivateFlags |= PFLAG_DRAWING_CACHE_VALID; 13144 } 13145 13146 // Fast path for layouts with no backgrounds 13147 if ((mPrivateFlags & PFLAG_SKIP_DRAW) == PFLAG_SKIP_DRAW) { 13148 mPrivateFlags &= ~PFLAG_DIRTY_MASK; 13149 dispatchDraw(canvas); 13150 if (mOverlay != null && !mOverlay.isEmpty()) { 13151 mOverlay.getOverlayView().draw(canvas); 13152 } 13153 } else { 13154 draw(canvas); 13155 } 13156 13157 canvas.restoreToCount(restoreCount); 13158 canvas.setBitmap(null); 13159 13160 if (attachInfo != null) { 13161 // Restore the cached Canvas for our siblings 13162 attachInfo.mCanvas = canvas; 13163 } 13164 } 13165 } 13166 13167 /** 13168 * Create a snapshot of the view into a bitmap. We should probably make 13169 * some form of this public, but should think about the API. 13170 */ 13171 Bitmap createSnapshot(Bitmap.Config quality, int backgroundColor, boolean skipChildren) { 13172 int width = mRight - mLeft; 13173 int height = mBottom - mTop; 13174 13175 final AttachInfo attachInfo = mAttachInfo; 13176 final float scale = attachInfo != null ? attachInfo.mApplicationScale : 1.0f; 13177 width = (int) ((width * scale) + 0.5f); 13178 height = (int) ((height * scale) + 0.5f); 13179 13180 Bitmap bitmap = Bitmap.createBitmap(mResources.getDisplayMetrics(), 13181 width > 0 ? width : 1, height > 0 ? height : 1, quality); 13182 if (bitmap == null) { 13183 throw new OutOfMemoryError(); 13184 } 13185 13186 Resources resources = getResources(); 13187 if (resources != null) { 13188 bitmap.setDensity(resources.getDisplayMetrics().densityDpi); 13189 } 13190 13191 Canvas canvas; 13192 if (attachInfo != null) { 13193 canvas = attachInfo.mCanvas; 13194 if (canvas == null) { 13195 canvas = new Canvas(); 13196 } 13197 canvas.setBitmap(bitmap); 13198 // Temporarily clobber the cached Canvas in case one of our children 13199 // is also using a drawing cache. Without this, the children would 13200 // steal the canvas by attaching their own bitmap to it and bad, bad 13201 // things would happen (invisible views, corrupted drawings, etc.) 13202 attachInfo.mCanvas = null; 13203 } else { 13204 // This case should hopefully never or seldom happen 13205 canvas = new Canvas(bitmap); 13206 } 13207 13208 if ((backgroundColor & 0xff000000) != 0) { 13209 bitmap.eraseColor(backgroundColor); 13210 } 13211 13212 computeScroll(); 13213 final int restoreCount = canvas.save(); 13214 canvas.scale(scale, scale); 13215 canvas.translate(-mScrollX, -mScrollY); 13216 13217 // Temporarily remove the dirty mask 13218 int flags = mPrivateFlags; 13219 mPrivateFlags &= ~PFLAG_DIRTY_MASK; 13220 13221 // Fast path for layouts with no backgrounds 13222 if ((mPrivateFlags & PFLAG_SKIP_DRAW) == PFLAG_SKIP_DRAW) { 13223 dispatchDraw(canvas); 13224 } else { 13225 draw(canvas); 13226 } 13227 13228 mPrivateFlags = flags; 13229 13230 canvas.restoreToCount(restoreCount); 13231 canvas.setBitmap(null); 13232 13233 if (attachInfo != null) { 13234 // Restore the cached Canvas for our siblings 13235 attachInfo.mCanvas = canvas; 13236 } 13237 13238 return bitmap; 13239 } 13240 13241 /** 13242 * Indicates whether this View is currently in edit mode. A View is usually 13243 * in edit mode when displayed within a developer tool. For instance, if 13244 * this View is being drawn by a visual user interface builder, this method 13245 * should return true. 13246 * 13247 * Subclasses should check the return value of this method to provide 13248 * different behaviors if their normal behavior might interfere with the 13249 * host environment. For instance: the class spawns a thread in its 13250 * constructor, the drawing code relies on device-specific features, etc. 13251 * 13252 * This method is usually checked in the drawing code of custom widgets. 13253 * 13254 * @return True if this View is in edit mode, false otherwise. 13255 */ 13256 public boolean isInEditMode() { 13257 return false; 13258 } 13259 13260 /** 13261 * If the View draws content inside its padding and enables fading edges, 13262 * it needs to support padding offsets. Padding offsets are added to the 13263 * fading edges to extend the length of the fade so that it covers pixels 13264 * drawn inside the padding. 13265 * 13266 * Subclasses of this class should override this method if they need 13267 * to draw content inside the padding. 13268 * 13269 * @return True if padding offset must be applied, false otherwise. 13270 * 13271 * @see #getLeftPaddingOffset() 13272 * @see #getRightPaddingOffset() 13273 * @see #getTopPaddingOffset() 13274 * @see #getBottomPaddingOffset() 13275 * 13276 * @since CURRENT 13277 */ 13278 protected boolean isPaddingOffsetRequired() { 13279 return false; 13280 } 13281 13282 /** 13283 * Amount by which to extend the left fading region. Called only when 13284 * {@link #isPaddingOffsetRequired()} returns true. 13285 * 13286 * @return The left padding offset in pixels. 13287 * 13288 * @see #isPaddingOffsetRequired() 13289 * 13290 * @since CURRENT 13291 */ 13292 protected int getLeftPaddingOffset() { 13293 return 0; 13294 } 13295 13296 /** 13297 * Amount by which to extend the right fading region. Called only when 13298 * {@link #isPaddingOffsetRequired()} returns true. 13299 * 13300 * @return The right padding offset in pixels. 13301 * 13302 * @see #isPaddingOffsetRequired() 13303 * 13304 * @since CURRENT 13305 */ 13306 protected int getRightPaddingOffset() { 13307 return 0; 13308 } 13309 13310 /** 13311 * Amount by which to extend the top fading region. Called only when 13312 * {@link #isPaddingOffsetRequired()} returns true. 13313 * 13314 * @return The top padding offset in pixels. 13315 * 13316 * @see #isPaddingOffsetRequired() 13317 * 13318 * @since CURRENT 13319 */ 13320 protected int getTopPaddingOffset() { 13321 return 0; 13322 } 13323 13324 /** 13325 * Amount by which to extend the bottom fading region. Called only when 13326 * {@link #isPaddingOffsetRequired()} returns true. 13327 * 13328 * @return The bottom padding offset in pixels. 13329 * 13330 * @see #isPaddingOffsetRequired() 13331 * 13332 * @since CURRENT 13333 */ 13334 protected int getBottomPaddingOffset() { 13335 return 0; 13336 } 13337 13338 /** 13339 * @hide 13340 * @param offsetRequired 13341 */ 13342 protected int getFadeTop(boolean offsetRequired) { 13343 int top = mPaddingTop; 13344 if (offsetRequired) top += getTopPaddingOffset(); 13345 return top; 13346 } 13347 13348 /** 13349 * @hide 13350 * @param offsetRequired 13351 */ 13352 protected int getFadeHeight(boolean offsetRequired) { 13353 int padding = mPaddingTop; 13354 if (offsetRequired) padding += getTopPaddingOffset(); 13355 return mBottom - mTop - mPaddingBottom - padding; 13356 } 13357 13358 /** 13359 * <p>Indicates whether this view is attached to a hardware accelerated 13360 * window or not.</p> 13361 * 13362 * <p>Even if this method returns true, it does not mean that every call 13363 * to {@link #draw(android.graphics.Canvas)} will be made with an hardware 13364 * accelerated {@link android.graphics.Canvas}. For instance, if this view 13365 * is drawn onto an offscreen {@link android.graphics.Bitmap} and its 13366 * window is hardware accelerated, 13367 * {@link android.graphics.Canvas#isHardwareAccelerated()} will likely 13368 * return false, and this method will return true.</p> 13369 * 13370 * @return True if the view is attached to a window and the window is 13371 * hardware accelerated; false in any other case. 13372 */ 13373 public boolean isHardwareAccelerated() { 13374 return mAttachInfo != null && mAttachInfo.mHardwareAccelerated; 13375 } 13376 13377 /** 13378 * Sets a rectangular area on this view to which the view will be clipped 13379 * when it is drawn. Setting the value to null will remove the clip bounds 13380 * and the view will draw normally, using its full bounds. 13381 * 13382 * @param clipBounds The rectangular area, in the local coordinates of 13383 * this view, to which future drawing operations will be clipped. 13384 */ 13385 public void setClipBounds(Rect clipBounds) { 13386 if (clipBounds != null) { 13387 if (clipBounds.equals(mClipBounds)) { 13388 return; 13389 } 13390 if (mClipBounds == null) { 13391 invalidate(); 13392 mClipBounds = new Rect(clipBounds); 13393 } else { 13394 invalidate(Math.min(mClipBounds.left, clipBounds.left), 13395 Math.min(mClipBounds.top, clipBounds.top), 13396 Math.max(mClipBounds.right, clipBounds.right), 13397 Math.max(mClipBounds.bottom, clipBounds.bottom)); 13398 mClipBounds.set(clipBounds); 13399 } 13400 } else { 13401 if (mClipBounds != null) { 13402 invalidate(); 13403 mClipBounds = null; 13404 } 13405 } 13406 } 13407 13408 /** 13409 * Returns a copy of the current {@link #setClipBounds(Rect) clipBounds}. 13410 * 13411 * @return A copy of the current clip bounds if clip bounds are set, 13412 * otherwise null. 13413 */ 13414 public Rect getClipBounds() { 13415 return (mClipBounds != null) ? new Rect(mClipBounds) : null; 13416 } 13417 13418 /** 13419 * Utility function, called by draw(canvas, parent, drawingTime) to handle the less common 13420 * case of an active Animation being run on the view. 13421 */ 13422 private boolean drawAnimation(ViewGroup parent, long drawingTime, 13423 Animation a, boolean scalingRequired) { 13424 Transformation invalidationTransform; 13425 final int flags = parent.mGroupFlags; 13426 final boolean initialized = a.isInitialized(); 13427 if (!initialized) { 13428 a.initialize(mRight - mLeft, mBottom - mTop, parent.getWidth(), parent.getHeight()); 13429 a.initializeInvalidateRegion(0, 0, mRight - mLeft, mBottom - mTop); 13430 if (mAttachInfo != null) a.setListenerHandler(mAttachInfo.mHandler); 13431 onAnimationStart(); 13432 } 13433 13434 boolean more = a.getTransformation(drawingTime, parent.mChildTransformation, 1f); 13435 if (scalingRequired && mAttachInfo.mApplicationScale != 1f) { 13436 if (parent.mInvalidationTransformation == null) { 13437 parent.mInvalidationTransformation = new Transformation(); 13438 } 13439 invalidationTransform = parent.mInvalidationTransformation; 13440 a.getTransformation(drawingTime, invalidationTransform, 1f); 13441 } else { 13442 invalidationTransform = parent.mChildTransformation; 13443 } 13444 13445 if (more) { 13446 if (!a.willChangeBounds()) { 13447 if ((flags & (ViewGroup.FLAG_OPTIMIZE_INVALIDATE | ViewGroup.FLAG_ANIMATION_DONE)) == 13448 ViewGroup.FLAG_OPTIMIZE_INVALIDATE) { 13449 parent.mGroupFlags |= ViewGroup.FLAG_INVALIDATE_REQUIRED; 13450 } else if ((flags & ViewGroup.FLAG_INVALIDATE_REQUIRED) == 0) { 13451 // The child need to draw an animation, potentially offscreen, so 13452 // make sure we do not cancel invalidate requests 13453 parent.mPrivateFlags |= PFLAG_DRAW_ANIMATION; 13454 parent.invalidate(mLeft, mTop, mRight, mBottom); 13455 } 13456 } else { 13457 if (parent.mInvalidateRegion == null) { 13458 parent.mInvalidateRegion = new RectF(); 13459 } 13460 final RectF region = parent.mInvalidateRegion; 13461 a.getInvalidateRegion(0, 0, mRight - mLeft, mBottom - mTop, region, 13462 invalidationTransform); 13463 13464 // The child need to draw an animation, potentially offscreen, so 13465 // make sure we do not cancel invalidate requests 13466 parent.mPrivateFlags |= PFLAG_DRAW_ANIMATION; 13467 13468 final int left = mLeft + (int) region.left; 13469 final int top = mTop + (int) region.top; 13470 parent.invalidate(left, top, left + (int) (region.width() + .5f), 13471 top + (int) (region.height() + .5f)); 13472 } 13473 } 13474 return more; 13475 } 13476 13477 /** 13478 * This method is called by getDisplayList() when a display list is created or re-rendered. 13479 * It sets or resets the current value of all properties on that display list (resetting is 13480 * necessary when a display list is being re-created, because we need to make sure that 13481 * previously-set transform values 13482 */ 13483 void setDisplayListProperties(DisplayList displayList) { 13484 if (displayList != null) { 13485 displayList.setLeftTopRightBottom(mLeft, mTop, mRight, mBottom); 13486 displayList.setHasOverlappingRendering(hasOverlappingRendering()); 13487 if (mParent instanceof ViewGroup) { 13488 displayList.setClipToBounds( 13489 (((ViewGroup) mParent).mGroupFlags & ViewGroup.FLAG_CLIP_CHILDREN) != 0); 13490 } 13491 float alpha = 1; 13492 if (mParent instanceof ViewGroup && (((ViewGroup) mParent).mGroupFlags & 13493 ViewGroup.FLAG_SUPPORT_STATIC_TRANSFORMATIONS) != 0) { 13494 ViewGroup parentVG = (ViewGroup) mParent; 13495 final boolean hasTransform = 13496 parentVG.getChildStaticTransformation(this, parentVG.mChildTransformation); 13497 if (hasTransform) { 13498 Transformation transform = parentVG.mChildTransformation; 13499 final int transformType = parentVG.mChildTransformation.getTransformationType(); 13500 if (transformType != Transformation.TYPE_IDENTITY) { 13501 if ((transformType & Transformation.TYPE_ALPHA) != 0) { 13502 alpha = transform.getAlpha(); 13503 } 13504 if ((transformType & Transformation.TYPE_MATRIX) != 0) { 13505 displayList.setMatrix(transform.getMatrix()); 13506 } 13507 } 13508 } 13509 } 13510 if (mTransformationInfo != null) { 13511 alpha *= mTransformationInfo.mAlpha; 13512 if (alpha < 1) { 13513 final int multipliedAlpha = (int) (255 * alpha); 13514 if (onSetAlpha(multipliedAlpha)) { 13515 alpha = 1; 13516 } 13517 } 13518 displayList.setTransformationInfo(alpha, 13519 mTransformationInfo.mTranslationX, mTransformationInfo.mTranslationY, 13520 mTransformationInfo.mRotation, mTransformationInfo.mRotationX, 13521 mTransformationInfo.mRotationY, mTransformationInfo.mScaleX, 13522 mTransformationInfo.mScaleY); 13523 if (mTransformationInfo.mCamera == null) { 13524 mTransformationInfo.mCamera = new Camera(); 13525 mTransformationInfo.matrix3D = new Matrix(); 13526 } 13527 displayList.setCameraDistance(mTransformationInfo.mCamera.getLocationZ()); 13528 if ((mPrivateFlags & PFLAG_PIVOT_EXPLICITLY_SET) == PFLAG_PIVOT_EXPLICITLY_SET) { 13529 displayList.setPivotX(getPivotX()); 13530 displayList.setPivotY(getPivotY()); 13531 } 13532 } else if (alpha < 1) { 13533 displayList.setAlpha(alpha); 13534 } 13535 } 13536 } 13537 13538 /** 13539 * This method is called by ViewGroup.drawChild() to have each child view draw itself. 13540 * This draw() method is an implementation detail and is not intended to be overridden or 13541 * to be called from anywhere else other than ViewGroup.drawChild(). 13542 */ 13543 boolean draw(Canvas canvas, ViewGroup parent, long drawingTime) { 13544 boolean useDisplayListProperties = mAttachInfo != null && mAttachInfo.mHardwareAccelerated; 13545 boolean more = false; 13546 final boolean childHasIdentityMatrix = hasIdentityMatrix(); 13547 final int flags = parent.mGroupFlags; 13548 13549 if ((flags & ViewGroup.FLAG_CLEAR_TRANSFORMATION) == ViewGroup.FLAG_CLEAR_TRANSFORMATION) { 13550 parent.mChildTransformation.clear(); 13551 parent.mGroupFlags &= ~ViewGroup.FLAG_CLEAR_TRANSFORMATION; 13552 } 13553 13554 Transformation transformToApply = null; 13555 boolean concatMatrix = false; 13556 13557 boolean scalingRequired = false; 13558 boolean caching; 13559 int layerType = getLayerType(); 13560 13561 final boolean hardwareAccelerated = canvas.isHardwareAccelerated(); 13562 if ((flags & ViewGroup.FLAG_CHILDREN_DRAWN_WITH_CACHE) != 0 || 13563 (flags & ViewGroup.FLAG_ALWAYS_DRAWN_WITH_CACHE) != 0) { 13564 caching = true; 13565 // Auto-scaled apps are not hw-accelerated, no need to set scaling flag on DisplayList 13566 if (mAttachInfo != null) scalingRequired = mAttachInfo.mScalingRequired; 13567 } else { 13568 caching = (layerType != LAYER_TYPE_NONE) || hardwareAccelerated; 13569 } 13570 13571 final Animation a = getAnimation(); 13572 if (a != null) { 13573 more = drawAnimation(parent, drawingTime, a, scalingRequired); 13574 concatMatrix = a.willChangeTransformationMatrix(); 13575 if (concatMatrix) { 13576 mPrivateFlags3 |= PFLAG3_VIEW_IS_ANIMATING_TRANSFORM; 13577 } 13578 transformToApply = parent.mChildTransformation; 13579 } else { 13580 if ((mPrivateFlags3 & PFLAG3_VIEW_IS_ANIMATING_TRANSFORM) == 13581 PFLAG3_VIEW_IS_ANIMATING_TRANSFORM && mDisplayList != null) { 13582 // No longer animating: clear out old animation matrix 13583 mDisplayList.setAnimationMatrix(null); 13584 mPrivateFlags3 &= ~PFLAG3_VIEW_IS_ANIMATING_TRANSFORM; 13585 } 13586 if (!useDisplayListProperties && 13587 (flags & ViewGroup.FLAG_SUPPORT_STATIC_TRANSFORMATIONS) != 0) { 13588 final boolean hasTransform = 13589 parent.getChildStaticTransformation(this, parent.mChildTransformation); 13590 if (hasTransform) { 13591 final int transformType = parent.mChildTransformation.getTransformationType(); 13592 transformToApply = transformType != Transformation.TYPE_IDENTITY ? 13593 parent.mChildTransformation : null; 13594 concatMatrix = (transformType & Transformation.TYPE_MATRIX) != 0; 13595 } 13596 } 13597 } 13598 13599 concatMatrix |= !childHasIdentityMatrix; 13600 13601 // Sets the flag as early as possible to allow draw() implementations 13602 // to call invalidate() successfully when doing animations 13603 mPrivateFlags |= PFLAG_DRAWN; 13604 13605 if (!concatMatrix && 13606 (flags & (ViewGroup.FLAG_SUPPORT_STATIC_TRANSFORMATIONS | 13607 ViewGroup.FLAG_CLIP_CHILDREN)) == ViewGroup.FLAG_CLIP_CHILDREN && 13608 canvas.quickReject(mLeft, mTop, mRight, mBottom, Canvas.EdgeType.BW) && 13609 (mPrivateFlags & PFLAG_DRAW_ANIMATION) == 0) { 13610 mPrivateFlags2 |= PFLAG2_VIEW_QUICK_REJECTED; 13611 return more; 13612 } 13613 mPrivateFlags2 &= ~PFLAG2_VIEW_QUICK_REJECTED; 13614 13615 if (hardwareAccelerated) { 13616 // Clear INVALIDATED flag to allow invalidation to occur during rendering, but 13617 // retain the flag's value temporarily in the mRecreateDisplayList flag 13618 mRecreateDisplayList = (mPrivateFlags & PFLAG_INVALIDATED) == PFLAG_INVALIDATED; 13619 mPrivateFlags &= ~PFLAG_INVALIDATED; 13620 } 13621 13622 DisplayList displayList = null; 13623 Bitmap cache = null; 13624 boolean hasDisplayList = false; 13625 if (caching) { 13626 if (!hardwareAccelerated) { 13627 if (layerType != LAYER_TYPE_NONE) { 13628 layerType = LAYER_TYPE_SOFTWARE; 13629 buildDrawingCache(true); 13630 } 13631 cache = getDrawingCache(true); 13632 } else { 13633 switch (layerType) { 13634 case LAYER_TYPE_SOFTWARE: 13635 if (useDisplayListProperties) { 13636 hasDisplayList = canHaveDisplayList(); 13637 } else { 13638 buildDrawingCache(true); 13639 cache = getDrawingCache(true); 13640 } 13641 break; 13642 case LAYER_TYPE_HARDWARE: 13643 if (useDisplayListProperties) { 13644 hasDisplayList = canHaveDisplayList(); 13645 } 13646 break; 13647 case LAYER_TYPE_NONE: 13648 // Delay getting the display list until animation-driven alpha values are 13649 // set up and possibly passed on to the view 13650 hasDisplayList = canHaveDisplayList(); 13651 break; 13652 } 13653 } 13654 } 13655 useDisplayListProperties &= hasDisplayList; 13656 if (useDisplayListProperties) { 13657 displayList = getDisplayList(); 13658 if (!displayList.isValid()) { 13659 // Uncommon, but possible. If a view is removed from the hierarchy during the call 13660 // to getDisplayList(), the display list will be marked invalid and we should not 13661 // try to use it again. 13662 displayList = null; 13663 hasDisplayList = false; 13664 useDisplayListProperties = false; 13665 } 13666 } 13667 13668 int sx = 0; 13669 int sy = 0; 13670 if (!hasDisplayList) { 13671 computeScroll(); 13672 sx = mScrollX; 13673 sy = mScrollY; 13674 } 13675 13676 final boolean hasNoCache = cache == null || hasDisplayList; 13677 final boolean offsetForScroll = cache == null && !hasDisplayList && 13678 layerType != LAYER_TYPE_HARDWARE; 13679 13680 int restoreTo = -1; 13681 if (!useDisplayListProperties || transformToApply != null) { 13682 restoreTo = canvas.save(); 13683 } 13684 if (offsetForScroll) { 13685 canvas.translate(mLeft - sx, mTop - sy); 13686 } else { 13687 if (!useDisplayListProperties) { 13688 canvas.translate(mLeft, mTop); 13689 } 13690 if (scalingRequired) { 13691 if (useDisplayListProperties) { 13692 // TODO: Might not need this if we put everything inside the DL 13693 restoreTo = canvas.save(); 13694 } 13695 // mAttachInfo cannot be null, otherwise scalingRequired == false 13696 final float scale = 1.0f / mAttachInfo.mApplicationScale; 13697 canvas.scale(scale, scale); 13698 } 13699 } 13700 13701 float alpha = useDisplayListProperties ? 1 : getAlpha(); 13702 if (transformToApply != null || alpha < 1 || !hasIdentityMatrix() || 13703 (mPrivateFlags3 & PFLAG3_VIEW_IS_ANIMATING_ALPHA) == PFLAG3_VIEW_IS_ANIMATING_ALPHA) { 13704 if (transformToApply != null || !childHasIdentityMatrix) { 13705 int transX = 0; 13706 int transY = 0; 13707 13708 if (offsetForScroll) { 13709 transX = -sx; 13710 transY = -sy; 13711 } 13712 13713 if (transformToApply != null) { 13714 if (concatMatrix) { 13715 if (useDisplayListProperties) { 13716 displayList.setAnimationMatrix(transformToApply.getMatrix()); 13717 } else { 13718 // Undo the scroll translation, apply the transformation matrix, 13719 // then redo the scroll translate to get the correct result. 13720 canvas.translate(-transX, -transY); 13721 canvas.concat(transformToApply.getMatrix()); 13722 canvas.translate(transX, transY); 13723 } 13724 parent.mGroupFlags |= ViewGroup.FLAG_CLEAR_TRANSFORMATION; 13725 } 13726 13727 float transformAlpha = transformToApply.getAlpha(); 13728 if (transformAlpha < 1) { 13729 alpha *= transformAlpha; 13730 parent.mGroupFlags |= ViewGroup.FLAG_CLEAR_TRANSFORMATION; 13731 } 13732 } 13733 13734 if (!childHasIdentityMatrix && !useDisplayListProperties) { 13735 canvas.translate(-transX, -transY); 13736 canvas.concat(getMatrix()); 13737 canvas.translate(transX, transY); 13738 } 13739 } 13740 13741 // Deal with alpha if it is or used to be <1 13742 if (alpha < 1 || 13743 (mPrivateFlags3 & PFLAG3_VIEW_IS_ANIMATING_ALPHA) == PFLAG3_VIEW_IS_ANIMATING_ALPHA) { 13744 if (alpha < 1) { 13745 mPrivateFlags3 |= PFLAG3_VIEW_IS_ANIMATING_ALPHA; 13746 } else { 13747 mPrivateFlags3 &= ~PFLAG3_VIEW_IS_ANIMATING_ALPHA; 13748 } 13749 parent.mGroupFlags |= ViewGroup.FLAG_CLEAR_TRANSFORMATION; 13750 if (hasNoCache) { 13751 final int multipliedAlpha = (int) (255 * alpha); 13752 if (!onSetAlpha(multipliedAlpha)) { 13753 int layerFlags = Canvas.HAS_ALPHA_LAYER_SAVE_FLAG; 13754 if ((flags & ViewGroup.FLAG_CLIP_CHILDREN) != 0 || 13755 layerType != LAYER_TYPE_NONE) { 13756 layerFlags |= Canvas.CLIP_TO_LAYER_SAVE_FLAG; 13757 } 13758 if (useDisplayListProperties) { 13759 displayList.setAlpha(alpha * getAlpha()); 13760 } else if (layerType == LAYER_TYPE_NONE) { 13761 final int scrollX = hasDisplayList ? 0 : sx; 13762 final int scrollY = hasDisplayList ? 0 : sy; 13763 canvas.saveLayerAlpha(scrollX, scrollY, scrollX + mRight - mLeft, 13764 scrollY + mBottom - mTop, multipliedAlpha, layerFlags); 13765 } 13766 } else { 13767 // Alpha is handled by the child directly, clobber the layer's alpha 13768 mPrivateFlags |= PFLAG_ALPHA_SET; 13769 } 13770 } 13771 } 13772 } else if ((mPrivateFlags & PFLAG_ALPHA_SET) == PFLAG_ALPHA_SET) { 13773 onSetAlpha(255); 13774 mPrivateFlags &= ~PFLAG_ALPHA_SET; 13775 } 13776 13777 if ((flags & ViewGroup.FLAG_CLIP_CHILDREN) == ViewGroup.FLAG_CLIP_CHILDREN && 13778 !useDisplayListProperties && cache == null) { 13779 if (offsetForScroll) { 13780 canvas.clipRect(sx, sy, sx + (mRight - mLeft), sy + (mBottom - mTop)); 13781 } else { 13782 if (!scalingRequired || cache == null) { 13783 canvas.clipRect(0, 0, mRight - mLeft, mBottom - mTop); 13784 } else { 13785 canvas.clipRect(0, 0, cache.getWidth(), cache.getHeight()); 13786 } 13787 } 13788 } 13789 13790 if (!useDisplayListProperties && hasDisplayList) { 13791 displayList = getDisplayList(); 13792 if (!displayList.isValid()) { 13793 // Uncommon, but possible. If a view is removed from the hierarchy during the call 13794 // to getDisplayList(), the display list will be marked invalid and we should not 13795 // try to use it again. 13796 displayList = null; 13797 hasDisplayList = false; 13798 } 13799 } 13800 13801 if (hasNoCache) { 13802 boolean layerRendered = false; 13803 if (layerType == LAYER_TYPE_HARDWARE && !useDisplayListProperties) { 13804 final HardwareLayer layer = getHardwareLayer(); 13805 if (layer != null && layer.isValid()) { 13806 mLayerPaint.setAlpha((int) (alpha * 255)); 13807 ((HardwareCanvas) canvas).drawHardwareLayer(layer, 0, 0, mLayerPaint); 13808 layerRendered = true; 13809 } else { 13810 final int scrollX = hasDisplayList ? 0 : sx; 13811 final int scrollY = hasDisplayList ? 0 : sy; 13812 canvas.saveLayer(scrollX, scrollY, 13813 scrollX + mRight - mLeft, scrollY + mBottom - mTop, mLayerPaint, 13814 Canvas.HAS_ALPHA_LAYER_SAVE_FLAG | Canvas.CLIP_TO_LAYER_SAVE_FLAG); 13815 } 13816 } 13817 13818 if (!layerRendered) { 13819 if (!hasDisplayList) { 13820 // Fast path for layouts with no backgrounds 13821 if ((mPrivateFlags & PFLAG_SKIP_DRAW) == PFLAG_SKIP_DRAW) { 13822 mPrivateFlags &= ~PFLAG_DIRTY_MASK; 13823 dispatchDraw(canvas); 13824 } else { 13825 draw(canvas); 13826 } 13827 } else { 13828 mPrivateFlags &= ~PFLAG_DIRTY_MASK; 13829 ((HardwareCanvas) canvas).drawDisplayList(displayList, null, flags); 13830 } 13831 } 13832 } else if (cache != null) { 13833 mPrivateFlags &= ~PFLAG_DIRTY_MASK; 13834 Paint cachePaint; 13835 13836 if (layerType == LAYER_TYPE_NONE) { 13837 cachePaint = parent.mCachePaint; 13838 if (cachePaint == null) { 13839 cachePaint = new Paint(); 13840 cachePaint.setDither(false); 13841 parent.mCachePaint = cachePaint; 13842 } 13843 if (alpha < 1) { 13844 cachePaint.setAlpha((int) (alpha * 255)); 13845 parent.mGroupFlags |= ViewGroup.FLAG_ALPHA_LOWER_THAN_ONE; 13846 } else if ((flags & ViewGroup.FLAG_ALPHA_LOWER_THAN_ONE) != 0) { 13847 cachePaint.setAlpha(255); 13848 parent.mGroupFlags &= ~ViewGroup.FLAG_ALPHA_LOWER_THAN_ONE; 13849 } 13850 } else { 13851 cachePaint = mLayerPaint; 13852 cachePaint.setAlpha((int) (alpha * 255)); 13853 } 13854 canvas.drawBitmap(cache, 0.0f, 0.0f, cachePaint); 13855 } 13856 13857 if (restoreTo >= 0) { 13858 canvas.restoreToCount(restoreTo); 13859 } 13860 13861 if (a != null && !more) { 13862 if (!hardwareAccelerated && !a.getFillAfter()) { 13863 onSetAlpha(255); 13864 } 13865 parent.finishAnimatingView(this, a); 13866 } 13867 13868 if (more && hardwareAccelerated) { 13869 // invalidation is the trigger to recreate display lists, so if we're using 13870 // display lists to render, force an invalidate to allow the animation to 13871 // continue drawing another frame 13872 parent.invalidate(true); 13873 if (a.hasAlpha() && (mPrivateFlags & PFLAG_ALPHA_SET) == PFLAG_ALPHA_SET) { 13874 // alpha animations should cause the child to recreate its display list 13875 invalidate(true); 13876 } 13877 } 13878 13879 mRecreateDisplayList = false; 13880 13881 return more; 13882 } 13883 13884 /** 13885 * Manually render this view (and all of its children) to the given Canvas. 13886 * The view must have already done a full layout before this function is 13887 * called. When implementing a view, implement 13888 * {@link #onDraw(android.graphics.Canvas)} instead of overriding this method. 13889 * If you do need to override this method, call the superclass version. 13890 * 13891 * @param canvas The Canvas to which the View is rendered. 13892 */ 13893 public void draw(Canvas canvas) { 13894 if (mClipBounds != null) { 13895 canvas.clipRect(mClipBounds); 13896 } 13897 final int privateFlags = mPrivateFlags; 13898 final boolean dirtyOpaque = (privateFlags & PFLAG_DIRTY_MASK) == PFLAG_DIRTY_OPAQUE && 13899 (mAttachInfo == null || !mAttachInfo.mIgnoreDirtyState); 13900 mPrivateFlags = (privateFlags & ~PFLAG_DIRTY_MASK) | PFLAG_DRAWN; 13901 13902 /* 13903 * Draw traversal performs several drawing steps which must be executed 13904 * in the appropriate order: 13905 * 13906 * 1. Draw the background 13907 * 2. If necessary, save the canvas' layers to prepare for fading 13908 * 3. Draw view's content 13909 * 4. Draw children 13910 * 5. If necessary, draw the fading edges and restore layers 13911 * 6. Draw decorations (scrollbars for instance) 13912 */ 13913 13914 // Step 1, draw the background, if needed 13915 int saveCount; 13916 13917 if (!dirtyOpaque) { 13918 final Drawable background = mBackground; 13919 if (background != null) { 13920 final int scrollX = mScrollX; 13921 final int scrollY = mScrollY; 13922 13923 if (mBackgroundSizeChanged) { 13924 background.setBounds(0, 0, mRight - mLeft, mBottom - mTop); 13925 mBackgroundSizeChanged = false; 13926 } 13927 13928 if ((scrollX | scrollY) == 0) { 13929 background.draw(canvas); 13930 } else { 13931 canvas.translate(scrollX, scrollY); 13932 background.draw(canvas); 13933 canvas.translate(-scrollX, -scrollY); 13934 } 13935 } 13936 } 13937 13938 // skip step 2 & 5 if possible (common case) 13939 final int viewFlags = mViewFlags; 13940 boolean horizontalEdges = (viewFlags & FADING_EDGE_HORIZONTAL) != 0; 13941 boolean verticalEdges = (viewFlags & FADING_EDGE_VERTICAL) != 0; 13942 if (!verticalEdges && !horizontalEdges) { 13943 // Step 3, draw the content 13944 if (!dirtyOpaque) onDraw(canvas); 13945 13946 // Step 4, draw the children 13947 dispatchDraw(canvas); 13948 13949 // Step 6, draw decorations (scrollbars) 13950 onDrawScrollBars(canvas); 13951 13952 if (mOverlay != null && !mOverlay.isEmpty()) { 13953 mOverlay.getOverlayView().dispatchDraw(canvas); 13954 } 13955 13956 // we're done... 13957 return; 13958 } 13959 13960 /* 13961 * Here we do the full fledged routine... 13962 * (this is an uncommon case where speed matters less, 13963 * this is why we repeat some of the tests that have been 13964 * done above) 13965 */ 13966 13967 boolean drawTop = false; 13968 boolean drawBottom = false; 13969 boolean drawLeft = false; 13970 boolean drawRight = false; 13971 13972 float topFadeStrength = 0.0f; 13973 float bottomFadeStrength = 0.0f; 13974 float leftFadeStrength = 0.0f; 13975 float rightFadeStrength = 0.0f; 13976 13977 // Step 2, save the canvas' layers 13978 int paddingLeft = mPaddingLeft; 13979 13980 final boolean offsetRequired = isPaddingOffsetRequired(); 13981 if (offsetRequired) { 13982 paddingLeft += getLeftPaddingOffset(); 13983 } 13984 13985 int left = mScrollX + paddingLeft; 13986 int right = left + mRight - mLeft - mPaddingRight - paddingLeft; 13987 int top = mScrollY + getFadeTop(offsetRequired); 13988 int bottom = top + getFadeHeight(offsetRequired); 13989 13990 if (offsetRequired) { 13991 right += getRightPaddingOffset(); 13992 bottom += getBottomPaddingOffset(); 13993 } 13994 13995 final ScrollabilityCache scrollabilityCache = mScrollCache; 13996 final float fadeHeight = scrollabilityCache.fadingEdgeLength; 13997 int length = (int) fadeHeight; 13998 13999 // clip the fade length if top and bottom fades overlap 14000 // overlapping fades produce odd-looking artifacts 14001 if (verticalEdges && (top + length > bottom - length)) { 14002 length = (bottom - top) / 2; 14003 } 14004 14005 // also clip horizontal fades if necessary 14006 if (horizontalEdges && (left + length > right - length)) { 14007 length = (right - left) / 2; 14008 } 14009 14010 if (verticalEdges) { 14011 topFadeStrength = Math.max(0.0f, Math.min(1.0f, getTopFadingEdgeStrength())); 14012 drawTop = topFadeStrength * fadeHeight > 1.0f; 14013 bottomFadeStrength = Math.max(0.0f, Math.min(1.0f, getBottomFadingEdgeStrength())); 14014 drawBottom = bottomFadeStrength * fadeHeight > 1.0f; 14015 } 14016 14017 if (horizontalEdges) { 14018 leftFadeStrength = Math.max(0.0f, Math.min(1.0f, getLeftFadingEdgeStrength())); 14019 drawLeft = leftFadeStrength * fadeHeight > 1.0f; 14020 rightFadeStrength = Math.max(0.0f, Math.min(1.0f, getRightFadingEdgeStrength())); 14021 drawRight = rightFadeStrength * fadeHeight > 1.0f; 14022 } 14023 14024 saveCount = canvas.getSaveCount(); 14025 14026 int solidColor = getSolidColor(); 14027 if (solidColor == 0) { 14028 final int flags = Canvas.HAS_ALPHA_LAYER_SAVE_FLAG; 14029 14030 if (drawTop) { 14031 canvas.saveLayer(left, top, right, top + length, null, flags); 14032 } 14033 14034 if (drawBottom) { 14035 canvas.saveLayer(left, bottom - length, right, bottom, null, flags); 14036 } 14037 14038 if (drawLeft) { 14039 canvas.saveLayer(left, top, left + length, bottom, null, flags); 14040 } 14041 14042 if (drawRight) { 14043 canvas.saveLayer(right - length, top, right, bottom, null, flags); 14044 } 14045 } else { 14046 scrollabilityCache.setFadeColor(solidColor); 14047 } 14048 14049 // Step 3, draw the content 14050 if (!dirtyOpaque) onDraw(canvas); 14051 14052 // Step 4, draw the children 14053 dispatchDraw(canvas); 14054 14055 // Step 5, draw the fade effect and restore layers 14056 final Paint p = scrollabilityCache.paint; 14057 final Matrix matrix = scrollabilityCache.matrix; 14058 final Shader fade = scrollabilityCache.shader; 14059 14060 if (drawTop) { 14061 matrix.setScale(1, fadeHeight * topFadeStrength); 14062 matrix.postTranslate(left, top); 14063 fade.setLocalMatrix(matrix); 14064 canvas.drawRect(left, top, right, top + length, p); 14065 } 14066 14067 if (drawBottom) { 14068 matrix.setScale(1, fadeHeight * bottomFadeStrength); 14069 matrix.postRotate(180); 14070 matrix.postTranslate(left, bottom); 14071 fade.setLocalMatrix(matrix); 14072 canvas.drawRect(left, bottom - length, right, bottom, p); 14073 } 14074 14075 if (drawLeft) { 14076 matrix.setScale(1, fadeHeight * leftFadeStrength); 14077 matrix.postRotate(-90); 14078 matrix.postTranslate(left, top); 14079 fade.setLocalMatrix(matrix); 14080 canvas.drawRect(left, top, left + length, bottom, p); 14081 } 14082 14083 if (drawRight) { 14084 matrix.setScale(1, fadeHeight * rightFadeStrength); 14085 matrix.postRotate(90); 14086 matrix.postTranslate(right, top); 14087 fade.setLocalMatrix(matrix); 14088 canvas.drawRect(right - length, top, right, bottom, p); 14089 } 14090 14091 canvas.restoreToCount(saveCount); 14092 14093 // Step 6, draw decorations (scrollbars) 14094 onDrawScrollBars(canvas); 14095 14096 if (mOverlay != null && !mOverlay.isEmpty()) { 14097 mOverlay.getOverlayView().dispatchDraw(canvas); 14098 } 14099 } 14100 14101 /** 14102 * Returns the overlay for this view, creating it if it does not yet exist. 14103 * Adding drawables to the overlay will cause them to be displayed whenever 14104 * the view itself is redrawn. Objects in the overlay should be actively 14105 * managed: remove them when they should not be displayed anymore. The 14106 * overlay will always have the same size as its host view. 14107 * 14108 * <p>Note: Overlays do not currently work correctly with {@link 14109 * SurfaceView} or {@link TextureView}; contents in overlays for these 14110 * types of views may not display correctly.</p> 14111 * 14112 * @return The ViewOverlay object for this view. 14113 * @see ViewOverlay 14114 */ 14115 public ViewOverlay getOverlay() { 14116 if (mOverlay == null) { 14117 mOverlay = new ViewOverlay(mContext, this); 14118 } 14119 return mOverlay; 14120 } 14121 14122 /** 14123 * Override this if your view is known to always be drawn on top of a solid color background, 14124 * and needs to draw fading edges. Returning a non-zero color enables the view system to 14125 * optimize the drawing of the fading edges. If you do return a non-zero color, the alpha 14126 * should be set to 0xFF. 14127 * 14128 * @see #setVerticalFadingEdgeEnabled(boolean) 14129 * @see #setHorizontalFadingEdgeEnabled(boolean) 14130 * 14131 * @return The known solid color background for this view, or 0 if the color may vary 14132 */ 14133 @ViewDebug.ExportedProperty(category = "drawing") 14134 public int getSolidColor() { 14135 return 0; 14136 } 14137 14138 /** 14139 * Build a human readable string representation of the specified view flags. 14140 * 14141 * @param flags the view flags to convert to a string 14142 * @return a String representing the supplied flags 14143 */ 14144 private static String printFlags(int flags) { 14145 String output = ""; 14146 int numFlags = 0; 14147 if ((flags & FOCUSABLE_MASK) == FOCUSABLE) { 14148 output += "TAKES_FOCUS"; 14149 numFlags++; 14150 } 14151 14152 switch (flags & VISIBILITY_MASK) { 14153 case INVISIBLE: 14154 if (numFlags > 0) { 14155 output += " "; 14156 } 14157 output += "INVISIBLE"; 14158 // USELESS HERE numFlags++; 14159 break; 14160 case GONE: 14161 if (numFlags > 0) { 14162 output += " "; 14163 } 14164 output += "GONE"; 14165 // USELESS HERE numFlags++; 14166 break; 14167 default: 14168 break; 14169 } 14170 return output; 14171 } 14172 14173 /** 14174 * Build a human readable string representation of the specified private 14175 * view flags. 14176 * 14177 * @param privateFlags the private view flags to convert to a string 14178 * @return a String representing the supplied flags 14179 */ 14180 private static String printPrivateFlags(int privateFlags) { 14181 String output = ""; 14182 int numFlags = 0; 14183 14184 if ((privateFlags & PFLAG_WANTS_FOCUS) == PFLAG_WANTS_FOCUS) { 14185 output += "WANTS_FOCUS"; 14186 numFlags++; 14187 } 14188 14189 if ((privateFlags & PFLAG_FOCUSED) == PFLAG_FOCUSED) { 14190 if (numFlags > 0) { 14191 output += " "; 14192 } 14193 output += "FOCUSED"; 14194 numFlags++; 14195 } 14196 14197 if ((privateFlags & PFLAG_SELECTED) == PFLAG_SELECTED) { 14198 if (numFlags > 0) { 14199 output += " "; 14200 } 14201 output += "SELECTED"; 14202 numFlags++; 14203 } 14204 14205 if ((privateFlags & PFLAG_IS_ROOT_NAMESPACE) == PFLAG_IS_ROOT_NAMESPACE) { 14206 if (numFlags > 0) { 14207 output += " "; 14208 } 14209 output += "IS_ROOT_NAMESPACE"; 14210 numFlags++; 14211 } 14212 14213 if ((privateFlags & PFLAG_HAS_BOUNDS) == PFLAG_HAS_BOUNDS) { 14214 if (numFlags > 0) { 14215 output += " "; 14216 } 14217 output += "HAS_BOUNDS"; 14218 numFlags++; 14219 } 14220 14221 if ((privateFlags & PFLAG_DRAWN) == PFLAG_DRAWN) { 14222 if (numFlags > 0) { 14223 output += " "; 14224 } 14225 output += "DRAWN"; 14226 // USELESS HERE numFlags++; 14227 } 14228 return output; 14229 } 14230 14231 /** 14232 * <p>Indicates whether or not this view's layout will be requested during 14233 * the next hierarchy layout pass.</p> 14234 * 14235 * @return true if the layout will be forced during next layout pass 14236 */ 14237 public boolean isLayoutRequested() { 14238 return (mPrivateFlags & PFLAG_FORCE_LAYOUT) == PFLAG_FORCE_LAYOUT; 14239 } 14240 14241 /** 14242 * Return true if o is a ViewGroup that is laying out using optical bounds. 14243 * @hide 14244 */ 14245 public static boolean isLayoutModeOptical(Object o) { 14246 return o instanceof ViewGroup && ((ViewGroup) o).isLayoutModeOptical(); 14247 } 14248 14249 private boolean setOpticalFrame(int left, int top, int right, int bottom) { 14250 Insets parentInsets = mParent instanceof View ? 14251 ((View) mParent).getOpticalInsets() : Insets.NONE; 14252 Insets childInsets = getOpticalInsets(); 14253 return setFrame( 14254 left + parentInsets.left - childInsets.left, 14255 top + parentInsets.top - childInsets.top, 14256 right + parentInsets.left + childInsets.right, 14257 bottom + parentInsets.top + childInsets.bottom); 14258 } 14259 14260 /** 14261 * Assign a size and position to a view and all of its 14262 * descendants 14263 * 14264 * <p>This is the second phase of the layout mechanism. 14265 * (The first is measuring). In this phase, each parent calls 14266 * layout on all of its children to position them. 14267 * This is typically done using the child measurements 14268 * that were stored in the measure pass().</p> 14269 * 14270 * <p>Derived classes should not override this method. 14271 * Derived classes with children should override 14272 * onLayout. In that method, they should 14273 * call layout on each of their children.</p> 14274 * 14275 * @param l Left position, relative to parent 14276 * @param t Top position, relative to parent 14277 * @param r Right position, relative to parent 14278 * @param b Bottom position, relative to parent 14279 */ 14280 @SuppressWarnings({"unchecked"}) 14281 public void layout(int l, int t, int r, int b) { 14282 int oldL = mLeft; 14283 int oldT = mTop; 14284 int oldB = mBottom; 14285 int oldR = mRight; 14286 boolean changed = isLayoutModeOptical(mParent) ? 14287 setOpticalFrame(l, t, r, b) : setFrame(l, t, r, b); 14288 if (changed || (mPrivateFlags & PFLAG_LAYOUT_REQUIRED) == PFLAG_LAYOUT_REQUIRED) { 14289 onLayout(changed, l, t, r, b); 14290 mPrivateFlags &= ~PFLAG_LAYOUT_REQUIRED; 14291 14292 ListenerInfo li = mListenerInfo; 14293 if (li != null && li.mOnLayoutChangeListeners != null) { 14294 ArrayList<OnLayoutChangeListener> listenersCopy = 14295 (ArrayList<OnLayoutChangeListener>)li.mOnLayoutChangeListeners.clone(); 14296 int numListeners = listenersCopy.size(); 14297 for (int i = 0; i < numListeners; ++i) { 14298 listenersCopy.get(i).onLayoutChange(this, l, t, r, b, oldL, oldT, oldR, oldB); 14299 } 14300 } 14301 } 14302 mPrivateFlags &= ~PFLAG_FORCE_LAYOUT; 14303 } 14304 14305 /** 14306 * Called from layout when this view should 14307 * assign a size and position to each of its children. 14308 * 14309 * Derived classes with children should override 14310 * this method and call layout on each of 14311 * their children. 14312 * @param changed This is a new size or position for this view 14313 * @param left Left position, relative to parent 14314 * @param top Top position, relative to parent 14315 * @param right Right position, relative to parent 14316 * @param bottom Bottom position, relative to parent 14317 */ 14318 protected void onLayout(boolean changed, int left, int top, int right, int bottom) { 14319 } 14320 14321 /** 14322 * Assign a size and position to this view. 14323 * 14324 * This is called from layout. 14325 * 14326 * @param left Left position, relative to parent 14327 * @param top Top position, relative to parent 14328 * @param right Right position, relative to parent 14329 * @param bottom Bottom position, relative to parent 14330 * @return true if the new size and position are different than the 14331 * previous ones 14332 * {@hide} 14333 */ 14334 protected boolean setFrame(int left, int top, int right, int bottom) { 14335 boolean changed = false; 14336 14337 if (DBG) { 14338 Log.d("View", this + " View.setFrame(" + left + "," + top + "," 14339 + right + "," + bottom + ")"); 14340 } 14341 14342 if (mLeft != left || mRight != right || mTop != top || mBottom != bottom) { 14343 changed = true; 14344 14345 // Remember our drawn bit 14346 int drawn = mPrivateFlags & PFLAG_DRAWN; 14347 14348 int oldWidth = mRight - mLeft; 14349 int oldHeight = mBottom - mTop; 14350 int newWidth = right - left; 14351 int newHeight = bottom - top; 14352 boolean sizeChanged = (newWidth != oldWidth) || (newHeight != oldHeight); 14353 14354 // Invalidate our old position 14355 invalidate(sizeChanged); 14356 14357 mLeft = left; 14358 mTop = top; 14359 mRight = right; 14360 mBottom = bottom; 14361 if (mDisplayList != null) { 14362 mDisplayList.setLeftTopRightBottom(mLeft, mTop, mRight, mBottom); 14363 } 14364 14365 mPrivateFlags |= PFLAG_HAS_BOUNDS; 14366 14367 14368 if (sizeChanged) { 14369 if ((mPrivateFlags & PFLAG_PIVOT_EXPLICITLY_SET) == 0) { 14370 // A change in dimension means an auto-centered pivot point changes, too 14371 if (mTransformationInfo != null) { 14372 mTransformationInfo.mMatrixDirty = true; 14373 } 14374 } 14375 sizeChange(newWidth, newHeight, oldWidth, oldHeight); 14376 } 14377 14378 if ((mViewFlags & VISIBILITY_MASK) == VISIBLE) { 14379 // If we are visible, force the DRAWN bit to on so that 14380 // this invalidate will go through (at least to our parent). 14381 // This is because someone may have invalidated this view 14382 // before this call to setFrame came in, thereby clearing 14383 // the DRAWN bit. 14384 mPrivateFlags |= PFLAG_DRAWN; 14385 invalidate(sizeChanged); 14386 // parent display list may need to be recreated based on a change in the bounds 14387 // of any child 14388 invalidateParentCaches(); 14389 } 14390 14391 // Reset drawn bit to original value (invalidate turns it off) 14392 mPrivateFlags |= drawn; 14393 14394 mBackgroundSizeChanged = true; 14395 } 14396 return changed; 14397 } 14398 14399 private void sizeChange(int newWidth, int newHeight, int oldWidth, int oldHeight) { 14400 onSizeChanged(newWidth, newHeight, oldWidth, oldHeight); 14401 if (mOverlay != null) { 14402 mOverlay.getOverlayView().setRight(newWidth); 14403 mOverlay.getOverlayView().setBottom(newHeight); 14404 } 14405 } 14406 14407 /** 14408 * Finalize inflating a view from XML. This is called as the last phase 14409 * of inflation, after all child views have been added. 14410 * 14411 * <p>Even if the subclass overrides onFinishInflate, they should always be 14412 * sure to call the super method, so that we get called. 14413 */ 14414 protected void onFinishInflate() { 14415 } 14416 14417 /** 14418 * Returns the resources associated with this view. 14419 * 14420 * @return Resources object. 14421 */ 14422 public Resources getResources() { 14423 return mResources; 14424 } 14425 14426 /** 14427 * Invalidates the specified Drawable. 14428 * 14429 * @param drawable the drawable to invalidate 14430 */ 14431 public void invalidateDrawable(Drawable drawable) { 14432 if (verifyDrawable(drawable)) { 14433 final Rect dirty = drawable.getBounds(); 14434 final int scrollX = mScrollX; 14435 final int scrollY = mScrollY; 14436 14437 invalidate(dirty.left + scrollX, dirty.top + scrollY, 14438 dirty.right + scrollX, dirty.bottom + scrollY); 14439 } 14440 } 14441 14442 /** 14443 * Schedules an action on a drawable to occur at a specified time. 14444 * 14445 * @param who the recipient of the action 14446 * @param what the action to run on the drawable 14447 * @param when the time at which the action must occur. Uses the 14448 * {@link SystemClock#uptimeMillis} timebase. 14449 */ 14450 public void scheduleDrawable(Drawable who, Runnable what, long when) { 14451 if (verifyDrawable(who) && what != null) { 14452 final long delay = when - SystemClock.uptimeMillis(); 14453 if (mAttachInfo != null) { 14454 mAttachInfo.mViewRootImpl.mChoreographer.postCallbackDelayed( 14455 Choreographer.CALLBACK_ANIMATION, what, who, 14456 Choreographer.subtractFrameDelay(delay)); 14457 } else { 14458 ViewRootImpl.getRunQueue().postDelayed(what, delay); 14459 } 14460 } 14461 } 14462 14463 /** 14464 * Cancels a scheduled action on a drawable. 14465 * 14466 * @param who the recipient of the action 14467 * @param what the action to cancel 14468 */ 14469 public void unscheduleDrawable(Drawable who, Runnable what) { 14470 if (verifyDrawable(who) && what != null) { 14471 if (mAttachInfo != null) { 14472 mAttachInfo.mViewRootImpl.mChoreographer.removeCallbacks( 14473 Choreographer.CALLBACK_ANIMATION, what, who); 14474 } else { 14475 ViewRootImpl.getRunQueue().removeCallbacks(what); 14476 } 14477 } 14478 } 14479 14480 /** 14481 * Unschedule any events associated with the given Drawable. This can be 14482 * used when selecting a new Drawable into a view, so that the previous 14483 * one is completely unscheduled. 14484 * 14485 * @param who The Drawable to unschedule. 14486 * 14487 * @see #drawableStateChanged 14488 */ 14489 public void unscheduleDrawable(Drawable who) { 14490 if (mAttachInfo != null && who != null) { 14491 mAttachInfo.mViewRootImpl.mChoreographer.removeCallbacks( 14492 Choreographer.CALLBACK_ANIMATION, null, who); 14493 } 14494 } 14495 14496 /** 14497 * Resolve the Drawables depending on the layout direction. This is implicitly supposing 14498 * that the View directionality can and will be resolved before its Drawables. 14499 * 14500 * Will call {@link View#onResolveDrawables} when resolution is done. 14501 * 14502 * @hide 14503 */ 14504 protected void resolveDrawables() { 14505 if (canResolveLayoutDirection()) { 14506 if (mBackground != null) { 14507 mBackground.setLayoutDirection(getLayoutDirection()); 14508 } 14509 mPrivateFlags2 |= PFLAG2_DRAWABLE_RESOLVED; 14510 onResolveDrawables(getLayoutDirection()); 14511 } 14512 } 14513 14514 /** 14515 * Called when layout direction has been resolved. 14516 * 14517 * The default implementation does nothing. 14518 * 14519 * @param layoutDirection The resolved layout direction. 14520 * 14521 * @see #LAYOUT_DIRECTION_LTR 14522 * @see #LAYOUT_DIRECTION_RTL 14523 * 14524 * @hide 14525 */ 14526 public void onResolveDrawables(int layoutDirection) { 14527 } 14528 14529 /** 14530 * @hide 14531 */ 14532 protected void resetResolvedDrawables() { 14533 mPrivateFlags2 &= ~PFLAG2_DRAWABLE_RESOLVED; 14534 } 14535 14536 private boolean isDrawablesResolved() { 14537 return (mPrivateFlags2 & PFLAG2_DRAWABLE_RESOLVED) == PFLAG2_DRAWABLE_RESOLVED; 14538 } 14539 14540 /** 14541 * If your view subclass is displaying its own Drawable objects, it should 14542 * override this function and return true for any Drawable it is 14543 * displaying. This allows animations for those drawables to be 14544 * scheduled. 14545 * 14546 * <p>Be sure to call through to the super class when overriding this 14547 * function. 14548 * 14549 * @param who The Drawable to verify. Return true if it is one you are 14550 * displaying, else return the result of calling through to the 14551 * super class. 14552 * 14553 * @return boolean If true than the Drawable is being displayed in the 14554 * view; else false and it is not allowed to animate. 14555 * 14556 * @see #unscheduleDrawable(android.graphics.drawable.Drawable) 14557 * @see #drawableStateChanged() 14558 */ 14559 protected boolean verifyDrawable(Drawable who) { 14560 return who == mBackground; 14561 } 14562 14563 /** 14564 * This function is called whenever the state of the view changes in such 14565 * a way that it impacts the state of drawables being shown. 14566 * 14567 * <p>Be sure to call through to the superclass when overriding this 14568 * function. 14569 * 14570 * @see Drawable#setState(int[]) 14571 */ 14572 protected void drawableStateChanged() { 14573 Drawable d = mBackground; 14574 if (d != null && d.isStateful()) { 14575 d.setState(getDrawableState()); 14576 } 14577 } 14578 14579 /** 14580 * Call this to force a view to update its drawable state. This will cause 14581 * drawableStateChanged to be called on this view. Views that are interested 14582 * in the new state should call getDrawableState. 14583 * 14584 * @see #drawableStateChanged 14585 * @see #getDrawableState 14586 */ 14587 public void refreshDrawableState() { 14588 mPrivateFlags |= PFLAG_DRAWABLE_STATE_DIRTY; 14589 drawableStateChanged(); 14590 14591 ViewParent parent = mParent; 14592 if (parent != null) { 14593 parent.childDrawableStateChanged(this); 14594 } 14595 } 14596 14597 /** 14598 * Return an array of resource IDs of the drawable states representing the 14599 * current state of the view. 14600 * 14601 * @return The current drawable state 14602 * 14603 * @see Drawable#setState(int[]) 14604 * @see #drawableStateChanged() 14605 * @see #onCreateDrawableState(int) 14606 */ 14607 public final int[] getDrawableState() { 14608 if ((mDrawableState != null) && ((mPrivateFlags & PFLAG_DRAWABLE_STATE_DIRTY) == 0)) { 14609 return mDrawableState; 14610 } else { 14611 mDrawableState = onCreateDrawableState(0); 14612 mPrivateFlags &= ~PFLAG_DRAWABLE_STATE_DIRTY; 14613 return mDrawableState; 14614 } 14615 } 14616 14617 /** 14618 * Generate the new {@link android.graphics.drawable.Drawable} state for 14619 * this view. This is called by the view 14620 * system when the cached Drawable state is determined to be invalid. To 14621 * retrieve the current state, you should use {@link #getDrawableState}. 14622 * 14623 * @param extraSpace if non-zero, this is the number of extra entries you 14624 * would like in the returned array in which you can place your own 14625 * states. 14626 * 14627 * @return Returns an array holding the current {@link Drawable} state of 14628 * the view. 14629 * 14630 * @see #mergeDrawableStates(int[], int[]) 14631 */ 14632 protected int[] onCreateDrawableState(int extraSpace) { 14633 if ((mViewFlags & DUPLICATE_PARENT_STATE) == DUPLICATE_PARENT_STATE && 14634 mParent instanceof View) { 14635 return ((View) mParent).onCreateDrawableState(extraSpace); 14636 } 14637 14638 int[] drawableState; 14639 14640 int privateFlags = mPrivateFlags; 14641 14642 int viewStateIndex = 0; 14643 if ((privateFlags & PFLAG_PRESSED) != 0) viewStateIndex |= VIEW_STATE_PRESSED; 14644 if ((mViewFlags & ENABLED_MASK) == ENABLED) viewStateIndex |= VIEW_STATE_ENABLED; 14645 if (isFocused()) viewStateIndex |= VIEW_STATE_FOCUSED; 14646 if ((privateFlags & PFLAG_SELECTED) != 0) viewStateIndex |= VIEW_STATE_SELECTED; 14647 if (hasWindowFocus()) viewStateIndex |= VIEW_STATE_WINDOW_FOCUSED; 14648 if ((privateFlags & PFLAG_ACTIVATED) != 0) viewStateIndex |= VIEW_STATE_ACTIVATED; 14649 if (mAttachInfo != null && mAttachInfo.mHardwareAccelerationRequested && 14650 HardwareRenderer.isAvailable()) { 14651 // This is set if HW acceleration is requested, even if the current 14652 // process doesn't allow it. This is just to allow app preview 14653 // windows to better match their app. 14654 viewStateIndex |= VIEW_STATE_ACCELERATED; 14655 } 14656 if ((privateFlags & PFLAG_HOVERED) != 0) viewStateIndex |= VIEW_STATE_HOVERED; 14657 14658 final int privateFlags2 = mPrivateFlags2; 14659 if ((privateFlags2 & PFLAG2_DRAG_CAN_ACCEPT) != 0) viewStateIndex |= VIEW_STATE_DRAG_CAN_ACCEPT; 14660 if ((privateFlags2 & PFLAG2_DRAG_HOVERED) != 0) viewStateIndex |= VIEW_STATE_DRAG_HOVERED; 14661 14662 drawableState = VIEW_STATE_SETS[viewStateIndex]; 14663 14664 //noinspection ConstantIfStatement 14665 if (false) { 14666 Log.i("View", "drawableStateIndex=" + viewStateIndex); 14667 Log.i("View", toString() 14668 + " pressed=" + ((privateFlags & PFLAG_PRESSED) != 0) 14669 + " en=" + ((mViewFlags & ENABLED_MASK) == ENABLED) 14670 + " fo=" + hasFocus() 14671 + " sl=" + ((privateFlags & PFLAG_SELECTED) != 0) 14672 + " wf=" + hasWindowFocus() 14673 + ": " + Arrays.toString(drawableState)); 14674 } 14675 14676 if (extraSpace == 0) { 14677 return drawableState; 14678 } 14679 14680 final int[] fullState; 14681 if (drawableState != null) { 14682 fullState = new int[drawableState.length + extraSpace]; 14683 System.arraycopy(drawableState, 0, fullState, 0, drawableState.length); 14684 } else { 14685 fullState = new int[extraSpace]; 14686 } 14687 14688 return fullState; 14689 } 14690 14691 /** 14692 * Merge your own state values in <var>additionalState</var> into the base 14693 * state values <var>baseState</var> that were returned by 14694 * {@link #onCreateDrawableState(int)}. 14695 * 14696 * @param baseState The base state values returned by 14697 * {@link #onCreateDrawableState(int)}, which will be modified to also hold your 14698 * own additional state values. 14699 * 14700 * @param additionalState The additional state values you would like 14701 * added to <var>baseState</var>; this array is not modified. 14702 * 14703 * @return As a convenience, the <var>baseState</var> array you originally 14704 * passed into the function is returned. 14705 * 14706 * @see #onCreateDrawableState(int) 14707 */ 14708 protected static int[] mergeDrawableStates(int[] baseState, int[] additionalState) { 14709 final int N = baseState.length; 14710 int i = N - 1; 14711 while (i >= 0 && baseState[i] == 0) { 14712 i--; 14713 } 14714 System.arraycopy(additionalState, 0, baseState, i + 1, additionalState.length); 14715 return baseState; 14716 } 14717 14718 /** 14719 * Call {@link Drawable#jumpToCurrentState() Drawable.jumpToCurrentState()} 14720 * on all Drawable objects associated with this view. 14721 */ 14722 public void jumpDrawablesToCurrentState() { 14723 if (mBackground != null) { 14724 mBackground.jumpToCurrentState(); 14725 } 14726 } 14727 14728 /** 14729 * Sets the background color for this view. 14730 * @param color the color of the background 14731 */ 14732 @RemotableViewMethod 14733 public void setBackgroundColor(int color) { 14734 if (mBackground instanceof ColorDrawable) { 14735 ((ColorDrawable) mBackground.mutate()).setColor(color); 14736 computeOpaqueFlags(); 14737 mBackgroundResource = 0; 14738 } else { 14739 setBackground(new ColorDrawable(color)); 14740 } 14741 } 14742 14743 /** 14744 * Set the background to a given resource. The resource should refer to 14745 * a Drawable object or 0 to remove the background. 14746 * @param resid The identifier of the resource. 14747 * 14748 * @attr ref android.R.styleable#View_background 14749 */ 14750 @RemotableViewMethod 14751 public void setBackgroundResource(int resid) { 14752 if (resid != 0 && resid == mBackgroundResource) { 14753 return; 14754 } 14755 14756 Drawable d= null; 14757 if (resid != 0) { 14758 d = mResources.getDrawable(resid); 14759 } 14760 setBackground(d); 14761 14762 mBackgroundResource = resid; 14763 } 14764 14765 /** 14766 * Set the background to a given Drawable, or remove the background. If the 14767 * background has padding, this View's padding is set to the background's 14768 * padding. However, when a background is removed, this View's padding isn't 14769 * touched. If setting the padding is desired, please use 14770 * {@link #setPadding(int, int, int, int)}. 14771 * 14772 * @param background The Drawable to use as the background, or null to remove the 14773 * background 14774 */ 14775 public void setBackground(Drawable background) { 14776 //noinspection deprecation 14777 setBackgroundDrawable(background); 14778 } 14779 14780 /** 14781 * @deprecated use {@link #setBackground(Drawable)} instead 14782 */ 14783 @Deprecated 14784 public void setBackgroundDrawable(Drawable background) { 14785 computeOpaqueFlags(); 14786 14787 if (background == mBackground) { 14788 return; 14789 } 14790 14791 boolean requestLayout = false; 14792 14793 mBackgroundResource = 0; 14794 14795 /* 14796 * Regardless of whether we're setting a new background or not, we want 14797 * to clear the previous drawable. 14798 */ 14799 if (mBackground != null) { 14800 mBackground.setCallback(null); 14801 unscheduleDrawable(mBackground); 14802 } 14803 14804 if (background != null) { 14805 Rect padding = sThreadLocal.get(); 14806 if (padding == null) { 14807 padding = new Rect(); 14808 sThreadLocal.set(padding); 14809 } 14810 resetResolvedDrawables(); 14811 background.setLayoutDirection(getLayoutDirection()); 14812 if (background.getPadding(padding)) { 14813 resetResolvedPadding(); 14814 switch (background.getLayoutDirection()) { 14815 case LAYOUT_DIRECTION_RTL: 14816 mUserPaddingLeftInitial = padding.right; 14817 mUserPaddingRightInitial = padding.left; 14818 internalSetPadding(padding.right, padding.top, padding.left, padding.bottom); 14819 break; 14820 case LAYOUT_DIRECTION_LTR: 14821 default: 14822 mUserPaddingLeftInitial = padding.left; 14823 mUserPaddingRightInitial = padding.right; 14824 internalSetPadding(padding.left, padding.top, padding.right, padding.bottom); 14825 } 14826 } 14827 14828 // Compare the minimum sizes of the old Drawable and the new. If there isn't an old or 14829 // if it has a different minimum size, we should layout again 14830 if (mBackground == null || mBackground.getMinimumHeight() != background.getMinimumHeight() || 14831 mBackground.getMinimumWidth() != background.getMinimumWidth()) { 14832 requestLayout = true; 14833 } 14834 14835 background.setCallback(this); 14836 if (background.isStateful()) { 14837 background.setState(getDrawableState()); 14838 } 14839 background.setVisible(getVisibility() == VISIBLE, false); 14840 mBackground = background; 14841 14842 if ((mPrivateFlags & PFLAG_SKIP_DRAW) != 0) { 14843 mPrivateFlags &= ~PFLAG_SKIP_DRAW; 14844 mPrivateFlags |= PFLAG_ONLY_DRAWS_BACKGROUND; 14845 requestLayout = true; 14846 } 14847 } else { 14848 /* Remove the background */ 14849 mBackground = null; 14850 14851 if ((mPrivateFlags & PFLAG_ONLY_DRAWS_BACKGROUND) != 0) { 14852 /* 14853 * This view ONLY drew the background before and we're removing 14854 * the background, so now it won't draw anything 14855 * (hence we SKIP_DRAW) 14856 */ 14857 mPrivateFlags &= ~PFLAG_ONLY_DRAWS_BACKGROUND; 14858 mPrivateFlags |= PFLAG_SKIP_DRAW; 14859 } 14860 14861 /* 14862 * When the background is set, we try to apply its padding to this 14863 * View. When the background is removed, we don't touch this View's 14864 * padding. This is noted in the Javadocs. Hence, we don't need to 14865 * requestLayout(), the invalidate() below is sufficient. 14866 */ 14867 14868 // The old background's minimum size could have affected this 14869 // View's layout, so let's requestLayout 14870 requestLayout = true; 14871 } 14872 14873 computeOpaqueFlags(); 14874 14875 if (requestLayout) { 14876 requestLayout(); 14877 } 14878 14879 mBackgroundSizeChanged = true; 14880 invalidate(true); 14881 } 14882 14883 /** 14884 * Gets the background drawable 14885 * 14886 * @return The drawable used as the background for this view, if any. 14887 * 14888 * @see #setBackground(Drawable) 14889 * 14890 * @attr ref android.R.styleable#View_background 14891 */ 14892 public Drawable getBackground() { 14893 return mBackground; 14894 } 14895 14896 /** 14897 * Sets the padding. The view may add on the space required to display 14898 * the scrollbars, depending on the style and visibility of the scrollbars. 14899 * So the values returned from {@link #getPaddingLeft}, {@link #getPaddingTop}, 14900 * {@link #getPaddingRight} and {@link #getPaddingBottom} may be different 14901 * from the values set in this call. 14902 * 14903 * @attr ref android.R.styleable#View_padding 14904 * @attr ref android.R.styleable#View_paddingBottom 14905 * @attr ref android.R.styleable#View_paddingLeft 14906 * @attr ref android.R.styleable#View_paddingRight 14907 * @attr ref android.R.styleable#View_paddingTop 14908 * @param left the left padding in pixels 14909 * @param top the top padding in pixels 14910 * @param right the right padding in pixels 14911 * @param bottom the bottom padding in pixels 14912 */ 14913 public void setPadding(int left, int top, int right, int bottom) { 14914 resetResolvedPadding(); 14915 14916 mUserPaddingStart = UNDEFINED_PADDING; 14917 mUserPaddingEnd = UNDEFINED_PADDING; 14918 14919 mUserPaddingLeftInitial = left; 14920 mUserPaddingRightInitial = right; 14921 14922 internalSetPadding(left, top, right, bottom); 14923 } 14924 14925 /** 14926 * @hide 14927 */ 14928 protected void internalSetPadding(int left, int top, int right, int bottom) { 14929 mUserPaddingLeft = left; 14930 mUserPaddingRight = right; 14931 mUserPaddingBottom = bottom; 14932 14933 final int viewFlags = mViewFlags; 14934 boolean changed = false; 14935 14936 // Common case is there are no scroll bars. 14937 if ((viewFlags & (SCROLLBARS_VERTICAL|SCROLLBARS_HORIZONTAL)) != 0) { 14938 if ((viewFlags & SCROLLBARS_VERTICAL) != 0) { 14939 final int offset = (viewFlags & SCROLLBARS_INSET_MASK) == 0 14940 ? 0 : getVerticalScrollbarWidth(); 14941 switch (mVerticalScrollbarPosition) { 14942 case SCROLLBAR_POSITION_DEFAULT: 14943 if (isLayoutRtl()) { 14944 left += offset; 14945 } else { 14946 right += offset; 14947 } 14948 break; 14949 case SCROLLBAR_POSITION_RIGHT: 14950 right += offset; 14951 break; 14952 case SCROLLBAR_POSITION_LEFT: 14953 left += offset; 14954 break; 14955 } 14956 } 14957 if ((viewFlags & SCROLLBARS_HORIZONTAL) != 0) { 14958 bottom += (viewFlags & SCROLLBARS_INSET_MASK) == 0 14959 ? 0 : getHorizontalScrollbarHeight(); 14960 } 14961 } 14962 14963 if (mPaddingLeft != left) { 14964 changed = true; 14965 mPaddingLeft = left; 14966 } 14967 if (mPaddingTop != top) { 14968 changed = true; 14969 mPaddingTop = top; 14970 } 14971 if (mPaddingRight != right) { 14972 changed = true; 14973 mPaddingRight = right; 14974 } 14975 if (mPaddingBottom != bottom) { 14976 changed = true; 14977 mPaddingBottom = bottom; 14978 } 14979 14980 if (changed) { 14981 requestLayout(); 14982 } 14983 } 14984 14985 /** 14986 * Sets the relative padding. The view may add on the space required to display 14987 * the scrollbars, depending on the style and visibility of the scrollbars. 14988 * So the values returned from {@link #getPaddingStart}, {@link #getPaddingTop}, 14989 * {@link #getPaddingEnd} and {@link #getPaddingBottom} may be different 14990 * from the values set in this call. 14991 * 14992 * @attr ref android.R.styleable#View_padding 14993 * @attr ref android.R.styleable#View_paddingBottom 14994 * @attr ref android.R.styleable#View_paddingStart 14995 * @attr ref android.R.styleable#View_paddingEnd 14996 * @attr ref android.R.styleable#View_paddingTop 14997 * @param start the start padding in pixels 14998 * @param top the top padding in pixels 14999 * @param end the end padding in pixels 15000 * @param bottom the bottom padding in pixels 15001 */ 15002 public void setPaddingRelative(int start, int top, int end, int bottom) { 15003 resetResolvedPadding(); 15004 15005 mUserPaddingStart = start; 15006 mUserPaddingEnd = end; 15007 15008 switch(getLayoutDirection()) { 15009 case LAYOUT_DIRECTION_RTL: 15010 mUserPaddingLeftInitial = end; 15011 mUserPaddingRightInitial = start; 15012 internalSetPadding(end, top, start, bottom); 15013 break; 15014 case LAYOUT_DIRECTION_LTR: 15015 default: 15016 mUserPaddingLeftInitial = start; 15017 mUserPaddingRightInitial = end; 15018 internalSetPadding(start, top, end, bottom); 15019 } 15020 } 15021 15022 /** 15023 * Returns the top padding of this view. 15024 * 15025 * @return the top padding in pixels 15026 */ 15027 public int getPaddingTop() { 15028 return mPaddingTop; 15029 } 15030 15031 /** 15032 * Returns the bottom padding of this view. If there are inset and enabled 15033 * scrollbars, this value may include the space required to display the 15034 * scrollbars as well. 15035 * 15036 * @return the bottom padding in pixels 15037 */ 15038 public int getPaddingBottom() { 15039 return mPaddingBottom; 15040 } 15041 15042 /** 15043 * Returns the left padding of this view. If there are inset and enabled 15044 * scrollbars, this value may include the space required to display the 15045 * scrollbars as well. 15046 * 15047 * @return the left padding in pixels 15048 */ 15049 public int getPaddingLeft() { 15050 if (!isPaddingResolved()) { 15051 resolvePadding(); 15052 } 15053 return mPaddingLeft; 15054 } 15055 15056 /** 15057 * Returns the start padding of this view depending on its resolved layout direction. 15058 * If there are inset and enabled scrollbars, this value may include the space 15059 * required to display the scrollbars as well. 15060 * 15061 * @return the start padding in pixels 15062 */ 15063 public int getPaddingStart() { 15064 if (!isPaddingResolved()) { 15065 resolvePadding(); 15066 } 15067 return (getLayoutDirection() == LAYOUT_DIRECTION_RTL) ? 15068 mPaddingRight : mPaddingLeft; 15069 } 15070 15071 /** 15072 * Returns the right padding of this view. If there are inset and enabled 15073 * scrollbars, this value may include the space required to display the 15074 * scrollbars as well. 15075 * 15076 * @return the right padding in pixels 15077 */ 15078 public int getPaddingRight() { 15079 if (!isPaddingResolved()) { 15080 resolvePadding(); 15081 } 15082 return mPaddingRight; 15083 } 15084 15085 /** 15086 * Returns the end padding of this view depending on its resolved layout direction. 15087 * If there are inset and enabled scrollbars, this value may include the space 15088 * required to display the scrollbars as well. 15089 * 15090 * @return the end padding in pixels 15091 */ 15092 public int getPaddingEnd() { 15093 if (!isPaddingResolved()) { 15094 resolvePadding(); 15095 } 15096 return (getLayoutDirection() == LAYOUT_DIRECTION_RTL) ? 15097 mPaddingLeft : mPaddingRight; 15098 } 15099 15100 /** 15101 * Return if the padding as been set thru relative values 15102 * {@link #setPaddingRelative(int, int, int, int)} or thru 15103 * @attr ref android.R.styleable#View_paddingStart or 15104 * @attr ref android.R.styleable#View_paddingEnd 15105 * 15106 * @return true if the padding is relative or false if it is not. 15107 */ 15108 public boolean isPaddingRelative() { 15109 return (mUserPaddingStart != UNDEFINED_PADDING || mUserPaddingEnd != UNDEFINED_PADDING); 15110 } 15111 15112 Insets computeOpticalInsets() { 15113 return (mBackground == null) ? Insets.NONE : mBackground.getOpticalInsets(); 15114 } 15115 15116 /** 15117 * @hide 15118 */ 15119 public void resetPaddingToInitialValues() { 15120 if (isRtlCompatibilityMode()) { 15121 mPaddingLeft = mUserPaddingLeftInitial; 15122 mPaddingRight = mUserPaddingRightInitial; 15123 return; 15124 } 15125 if (isLayoutRtl()) { 15126 mPaddingLeft = (mUserPaddingEnd >= 0) ? mUserPaddingEnd : mUserPaddingLeftInitial; 15127 mPaddingRight = (mUserPaddingStart >= 0) ? mUserPaddingStart : mUserPaddingRightInitial; 15128 } else { 15129 mPaddingLeft = (mUserPaddingStart >= 0) ? mUserPaddingStart : mUserPaddingLeftInitial; 15130 mPaddingRight = (mUserPaddingEnd >= 0) ? mUserPaddingEnd : mUserPaddingRightInitial; 15131 } 15132 } 15133 15134 /** 15135 * @hide 15136 */ 15137 public Insets getOpticalInsets() { 15138 if (mLayoutInsets == null) { 15139 mLayoutInsets = computeOpticalInsets(); 15140 } 15141 return mLayoutInsets; 15142 } 15143 15144 /** 15145 * Changes the selection state of this view. A view can be selected or not. 15146 * Note that selection is not the same as focus. Views are typically 15147 * selected in the context of an AdapterView like ListView or GridView; 15148 * the selected view is the view that is highlighted. 15149 * 15150 * @param selected true if the view must be selected, false otherwise 15151 */ 15152 public void setSelected(boolean selected) { 15153 if (((mPrivateFlags & PFLAG_SELECTED) != 0) != selected) { 15154 mPrivateFlags = (mPrivateFlags & ~PFLAG_SELECTED) | (selected ? PFLAG_SELECTED : 0); 15155 if (!selected) resetPressedState(); 15156 invalidate(true); 15157 refreshDrawableState(); 15158 dispatchSetSelected(selected); 15159 if (AccessibilityManager.getInstance(mContext).isEnabled()) { 15160 notifyAccessibilityStateChanged(); 15161 } 15162 } 15163 } 15164 15165 /** 15166 * Dispatch setSelected to all of this View's children. 15167 * 15168 * @see #setSelected(boolean) 15169 * 15170 * @param selected The new selected state 15171 */ 15172 protected void dispatchSetSelected(boolean selected) { 15173 } 15174 15175 /** 15176 * Indicates the selection state of this view. 15177 * 15178 * @return true if the view is selected, false otherwise 15179 */ 15180 @ViewDebug.ExportedProperty 15181 public boolean isSelected() { 15182 return (mPrivateFlags & PFLAG_SELECTED) != 0; 15183 } 15184 15185 /** 15186 * Changes the activated state of this view. A view can be activated or not. 15187 * Note that activation is not the same as selection. Selection is 15188 * a transient property, representing the view (hierarchy) the user is 15189 * currently interacting with. Activation is a longer-term state that the 15190 * user can move views in and out of. For example, in a list view with 15191 * single or multiple selection enabled, the views in the current selection 15192 * set are activated. (Um, yeah, we are deeply sorry about the terminology 15193 * here.) The activated state is propagated down to children of the view it 15194 * is set on. 15195 * 15196 * @param activated true if the view must be activated, false otherwise 15197 */ 15198 public void setActivated(boolean activated) { 15199 if (((mPrivateFlags & PFLAG_ACTIVATED) != 0) != activated) { 15200 mPrivateFlags = (mPrivateFlags & ~PFLAG_ACTIVATED) | (activated ? PFLAG_ACTIVATED : 0); 15201 invalidate(true); 15202 refreshDrawableState(); 15203 dispatchSetActivated(activated); 15204 } 15205 } 15206 15207 /** 15208 * Dispatch setActivated to all of this View's children. 15209 * 15210 * @see #setActivated(boolean) 15211 * 15212 * @param activated The new activated state 15213 */ 15214 protected void dispatchSetActivated(boolean activated) { 15215 } 15216 15217 /** 15218 * Indicates the activation state of this view. 15219 * 15220 * @return true if the view is activated, false otherwise 15221 */ 15222 @ViewDebug.ExportedProperty 15223 public boolean isActivated() { 15224 return (mPrivateFlags & PFLAG_ACTIVATED) != 0; 15225 } 15226 15227 /** 15228 * Returns the ViewTreeObserver for this view's hierarchy. The view tree 15229 * observer can be used to get notifications when global events, like 15230 * layout, happen. 15231 * 15232 * The returned ViewTreeObserver observer is not guaranteed to remain 15233 * valid for the lifetime of this View. If the caller of this method keeps 15234 * a long-lived reference to ViewTreeObserver, it should always check for 15235 * the return value of {@link ViewTreeObserver#isAlive()}. 15236 * 15237 * @return The ViewTreeObserver for this view's hierarchy. 15238 */ 15239 public ViewTreeObserver getViewTreeObserver() { 15240 if (mAttachInfo != null) { 15241 return mAttachInfo.mTreeObserver; 15242 } 15243 if (mFloatingTreeObserver == null) { 15244 mFloatingTreeObserver = new ViewTreeObserver(); 15245 } 15246 return mFloatingTreeObserver; 15247 } 15248 15249 /** 15250 * <p>Finds the topmost view in the current view hierarchy.</p> 15251 * 15252 * @return the topmost view containing this view 15253 */ 15254 public View getRootView() { 15255 if (mAttachInfo != null) { 15256 final View v = mAttachInfo.mRootView; 15257 if (v != null) { 15258 return v; 15259 } 15260 } 15261 15262 View parent = this; 15263 15264 while (parent.mParent != null && parent.mParent instanceof View) { 15265 parent = (View) parent.mParent; 15266 } 15267 15268 return parent; 15269 } 15270 15271 /** 15272 * <p>Computes the coordinates of this view on the screen. The argument 15273 * must be an array of two integers. After the method returns, the array 15274 * contains the x and y location in that order.</p> 15275 * 15276 * @param location an array of two integers in which to hold the coordinates 15277 */ 15278 public void getLocationOnScreen(int[] location) { 15279 getLocationInWindow(location); 15280 15281 final AttachInfo info = mAttachInfo; 15282 if (info != null) { 15283 location[0] += info.mWindowLeft; 15284 location[1] += info.mWindowTop; 15285 } 15286 } 15287 15288 /** 15289 * <p>Computes the coordinates of this view in its window. The argument 15290 * must be an array of two integers. After the method returns, the array 15291 * contains the x and y location in that order.</p> 15292 * 15293 * @param location an array of two integers in which to hold the coordinates 15294 */ 15295 public void getLocationInWindow(int[] location) { 15296 if (location == null || location.length < 2) { 15297 throw new IllegalArgumentException("location must be an array of two integers"); 15298 } 15299 15300 if (mAttachInfo == null) { 15301 // When the view is not attached to a window, this method does not make sense 15302 location[0] = location[1] = 0; 15303 return; 15304 } 15305 15306 float[] position = mAttachInfo.mTmpTransformLocation; 15307 position[0] = position[1] = 0.0f; 15308 15309 if (!hasIdentityMatrix()) { 15310 getMatrix().mapPoints(position); 15311 } 15312 15313 position[0] += mLeft; 15314 position[1] += mTop; 15315 15316 ViewParent viewParent = mParent; 15317 while (viewParent instanceof View) { 15318 final View view = (View) viewParent; 15319 15320 position[0] -= view.mScrollX; 15321 position[1] -= view.mScrollY; 15322 15323 if (!view.hasIdentityMatrix()) { 15324 view.getMatrix().mapPoints(position); 15325 } 15326 15327 position[0] += view.mLeft; 15328 position[1] += view.mTop; 15329 15330 viewParent = view.mParent; 15331 } 15332 15333 if (viewParent instanceof ViewRootImpl) { 15334 // *cough* 15335 final ViewRootImpl vr = (ViewRootImpl) viewParent; 15336 position[1] -= vr.mCurScrollY; 15337 } 15338 15339 location[0] = (int) (position[0] + 0.5f); 15340 location[1] = (int) (position[1] + 0.5f); 15341 } 15342 15343 /** 15344 * {@hide} 15345 * @param id the id of the view to be found 15346 * @return the view of the specified id, null if cannot be found 15347 */ 15348 protected View findViewTraversal(int id) { 15349 if (id == mID) { 15350 return this; 15351 } 15352 return null; 15353 } 15354 15355 /** 15356 * {@hide} 15357 * @param tag the tag of the view to be found 15358 * @return the view of specified tag, null if cannot be found 15359 */ 15360 protected View findViewWithTagTraversal(Object tag) { 15361 if (tag != null && tag.equals(mTag)) { 15362 return this; 15363 } 15364 return null; 15365 } 15366 15367 /** 15368 * {@hide} 15369 * @param predicate The predicate to evaluate. 15370 * @param childToSkip If not null, ignores this child during the recursive traversal. 15371 * @return The first view that matches the predicate or null. 15372 */ 15373 protected View findViewByPredicateTraversal(Predicate<View> predicate, View childToSkip) { 15374 if (predicate.apply(this)) { 15375 return this; 15376 } 15377 return null; 15378 } 15379 15380 /** 15381 * Look for a child view with the given id. If this view has the given 15382 * id, return this view. 15383 * 15384 * @param id The id to search for. 15385 * @return The view that has the given id in the hierarchy or null 15386 */ 15387 public final View findViewById(int id) { 15388 if (id < 0) { 15389 return null; 15390 } 15391 return findViewTraversal(id); 15392 } 15393 15394 /** 15395 * Finds a view by its unuque and stable accessibility id. 15396 * 15397 * @param accessibilityId The searched accessibility id. 15398 * @return The found view. 15399 */ 15400 final View findViewByAccessibilityId(int accessibilityId) { 15401 if (accessibilityId < 0) { 15402 return null; 15403 } 15404 return findViewByAccessibilityIdTraversal(accessibilityId); 15405 } 15406 15407 /** 15408 * Performs the traversal to find a view by its unuque and stable accessibility id. 15409 * 15410 * <strong>Note:</strong>This method does not stop at the root namespace 15411 * boundary since the user can touch the screen at an arbitrary location 15412 * potentially crossing the root namespace bounday which will send an 15413 * accessibility event to accessibility services and they should be able 15414 * to obtain the event source. Also accessibility ids are guaranteed to be 15415 * unique in the window. 15416 * 15417 * @param accessibilityId The accessibility id. 15418 * @return The found view. 15419 * 15420 * @hide 15421 */ 15422 public View findViewByAccessibilityIdTraversal(int accessibilityId) { 15423 if (getAccessibilityViewId() == accessibilityId) { 15424 return this; 15425 } 15426 return null; 15427 } 15428 15429 /** 15430 * Look for a child view with the given tag. If this view has the given 15431 * tag, return this view. 15432 * 15433 * @param tag The tag to search for, using "tag.equals(getTag())". 15434 * @return The View that has the given tag in the hierarchy or null 15435 */ 15436 public final View findViewWithTag(Object tag) { 15437 if (tag == null) { 15438 return null; 15439 } 15440 return findViewWithTagTraversal(tag); 15441 } 15442 15443 /** 15444 * {@hide} 15445 * Look for a child view that matches the specified predicate. 15446 * If this view matches the predicate, return this view. 15447 * 15448 * @param predicate The predicate to evaluate. 15449 * @return The first view that matches the predicate or null. 15450 */ 15451 public final View findViewByPredicate(Predicate<View> predicate) { 15452 return findViewByPredicateTraversal(predicate, null); 15453 } 15454 15455 /** 15456 * {@hide} 15457 * Look for a child view that matches the specified predicate, 15458 * starting with the specified view and its descendents and then 15459 * recusively searching the ancestors and siblings of that view 15460 * until this view is reached. 15461 * 15462 * This method is useful in cases where the predicate does not match 15463 * a single unique view (perhaps multiple views use the same id) 15464 * and we are trying to find the view that is "closest" in scope to the 15465 * starting view. 15466 * 15467 * @param start The view to start from. 15468 * @param predicate The predicate to evaluate. 15469 * @return The first view that matches the predicate or null. 15470 */ 15471 public final View findViewByPredicateInsideOut(View start, Predicate<View> predicate) { 15472 View childToSkip = null; 15473 for (;;) { 15474 View view = start.findViewByPredicateTraversal(predicate, childToSkip); 15475 if (view != null || start == this) { 15476 return view; 15477 } 15478 15479 ViewParent parent = start.getParent(); 15480 if (parent == null || !(parent instanceof View)) { 15481 return null; 15482 } 15483 15484 childToSkip = start; 15485 start = (View) parent; 15486 } 15487 } 15488 15489 /** 15490 * Sets the identifier for this view. The identifier does not have to be 15491 * unique in this view's hierarchy. The identifier should be a positive 15492 * number. 15493 * 15494 * @see #NO_ID 15495 * @see #getId() 15496 * @see #findViewById(int) 15497 * 15498 * @param id a number used to identify the view 15499 * 15500 * @attr ref android.R.styleable#View_id 15501 */ 15502 public void setId(int id) { 15503 mID = id; 15504 if (mID == View.NO_ID && mLabelForId != View.NO_ID) { 15505 mID = generateViewId(); 15506 } 15507 } 15508 15509 /** 15510 * {@hide} 15511 * 15512 * @param isRoot true if the view belongs to the root namespace, false 15513 * otherwise 15514 */ 15515 public void setIsRootNamespace(boolean isRoot) { 15516 if (isRoot) { 15517 mPrivateFlags |= PFLAG_IS_ROOT_NAMESPACE; 15518 } else { 15519 mPrivateFlags &= ~PFLAG_IS_ROOT_NAMESPACE; 15520 } 15521 } 15522 15523 /** 15524 * {@hide} 15525 * 15526 * @return true if the view belongs to the root namespace, false otherwise 15527 */ 15528 public boolean isRootNamespace() { 15529 return (mPrivateFlags&PFLAG_IS_ROOT_NAMESPACE) != 0; 15530 } 15531 15532 /** 15533 * Returns this view's identifier. 15534 * 15535 * @return a positive integer used to identify the view or {@link #NO_ID} 15536 * if the view has no ID 15537 * 15538 * @see #setId(int) 15539 * @see #findViewById(int) 15540 * @attr ref android.R.styleable#View_id 15541 */ 15542 @ViewDebug.CapturedViewProperty 15543 public int getId() { 15544 return mID; 15545 } 15546 15547 /** 15548 * Returns this view's tag. 15549 * 15550 * @return the Object stored in this view as a tag 15551 * 15552 * @see #setTag(Object) 15553 * @see #getTag(int) 15554 */ 15555 @ViewDebug.ExportedProperty 15556 public Object getTag() { 15557 return mTag; 15558 } 15559 15560 /** 15561 * Sets the tag associated with this view. A tag can be used to mark 15562 * a view in its hierarchy and does not have to be unique within the 15563 * hierarchy. Tags can also be used to store data within a view without 15564 * resorting to another data structure. 15565 * 15566 * @param tag an Object to tag the view with 15567 * 15568 * @see #getTag() 15569 * @see #setTag(int, Object) 15570 */ 15571 public void setTag(final Object tag) { 15572 mTag = tag; 15573 } 15574 15575 /** 15576 * Returns the tag associated with this view and the specified key. 15577 * 15578 * @param key The key identifying the tag 15579 * 15580 * @return the Object stored in this view as a tag 15581 * 15582 * @see #setTag(int, Object) 15583 * @see #getTag() 15584 */ 15585 public Object getTag(int key) { 15586 if (mKeyedTags != null) return mKeyedTags.get(key); 15587 return null; 15588 } 15589 15590 /** 15591 * Sets a tag associated with this view and a key. A tag can be used 15592 * to mark a view in its hierarchy and does not have to be unique within 15593 * the hierarchy. Tags can also be used to store data within a view 15594 * without resorting to another data structure. 15595 * 15596 * The specified key should be an id declared in the resources of the 15597 * application to ensure it is unique (see the <a 15598 * href={@docRoot}guide/topics/resources/more-resources.html#Id">ID resource type</a>). 15599 * Keys identified as belonging to 15600 * the Android framework or not associated with any package will cause 15601 * an {@link IllegalArgumentException} to be thrown. 15602 * 15603 * @param key The key identifying the tag 15604 * @param tag An Object to tag the view with 15605 * 15606 * @throws IllegalArgumentException If they specified key is not valid 15607 * 15608 * @see #setTag(Object) 15609 * @see #getTag(int) 15610 */ 15611 public void setTag(int key, final Object tag) { 15612 // If the package id is 0x00 or 0x01, it's either an undefined package 15613 // or a framework id 15614 if ((key >>> 24) < 2) { 15615 throw new IllegalArgumentException("The key must be an application-specific " 15616 + "resource id."); 15617 } 15618 15619 setKeyedTag(key, tag); 15620 } 15621 15622 /** 15623 * Variation of {@link #setTag(int, Object)} that enforces the key to be a 15624 * framework id. 15625 * 15626 * @hide 15627 */ 15628 public void setTagInternal(int key, Object tag) { 15629 if ((key >>> 24) != 0x1) { 15630 throw new IllegalArgumentException("The key must be a framework-specific " 15631 + "resource id."); 15632 } 15633 15634 setKeyedTag(key, tag); 15635 } 15636 15637 private void setKeyedTag(int key, Object tag) { 15638 if (mKeyedTags == null) { 15639 mKeyedTags = new SparseArray<Object>(); 15640 } 15641 15642 mKeyedTags.put(key, tag); 15643 } 15644 15645 /** 15646 * Prints information about this view in the log output, with the tag 15647 * {@link #VIEW_LOG_TAG}. 15648 * 15649 * @hide 15650 */ 15651 public void debug() { 15652 debug(0); 15653 } 15654 15655 /** 15656 * Prints information about this view in the log output, with the tag 15657 * {@link #VIEW_LOG_TAG}. Each line in the output is preceded with an 15658 * indentation defined by the <code>depth</code>. 15659 * 15660 * @param depth the indentation level 15661 * 15662 * @hide 15663 */ 15664 protected void debug(int depth) { 15665 String output = debugIndent(depth - 1); 15666 15667 output += "+ " + this; 15668 int id = getId(); 15669 if (id != -1) { 15670 output += " (id=" + id + ")"; 15671 } 15672 Object tag = getTag(); 15673 if (tag != null) { 15674 output += " (tag=" + tag + ")"; 15675 } 15676 Log.d(VIEW_LOG_TAG, output); 15677 15678 if ((mPrivateFlags & PFLAG_FOCUSED) != 0) { 15679 output = debugIndent(depth) + " FOCUSED"; 15680 Log.d(VIEW_LOG_TAG, output); 15681 } 15682 15683 output = debugIndent(depth); 15684 output += "frame={" + mLeft + ", " + mTop + ", " + mRight 15685 + ", " + mBottom + "} scroll={" + mScrollX + ", " + mScrollY 15686 + "} "; 15687 Log.d(VIEW_LOG_TAG, output); 15688 15689 if (mPaddingLeft != 0 || mPaddingTop != 0 || mPaddingRight != 0 15690 || mPaddingBottom != 0) { 15691 output = debugIndent(depth); 15692 output += "padding={" + mPaddingLeft + ", " + mPaddingTop 15693 + ", " + mPaddingRight + ", " + mPaddingBottom + "}"; 15694 Log.d(VIEW_LOG_TAG, output); 15695 } 15696 15697 output = debugIndent(depth); 15698 output += "mMeasureWidth=" + mMeasuredWidth + 15699 " mMeasureHeight=" + mMeasuredHeight; 15700 Log.d(VIEW_LOG_TAG, output); 15701 15702 output = debugIndent(depth); 15703 if (mLayoutParams == null) { 15704 output += "BAD! no layout params"; 15705 } else { 15706 output = mLayoutParams.debug(output); 15707 } 15708 Log.d(VIEW_LOG_TAG, output); 15709 15710 output = debugIndent(depth); 15711 output += "flags={"; 15712 output += View.printFlags(mViewFlags); 15713 output += "}"; 15714 Log.d(VIEW_LOG_TAG, output); 15715 15716 output = debugIndent(depth); 15717 output += "privateFlags={"; 15718 output += View.printPrivateFlags(mPrivateFlags); 15719 output += "}"; 15720 Log.d(VIEW_LOG_TAG, output); 15721 } 15722 15723 /** 15724 * Creates a string of whitespaces used for indentation. 15725 * 15726 * @param depth the indentation level 15727 * @return a String containing (depth * 2 + 3) * 2 white spaces 15728 * 15729 * @hide 15730 */ 15731 protected static String debugIndent(int depth) { 15732 StringBuilder spaces = new StringBuilder((depth * 2 + 3) * 2); 15733 for (int i = 0; i < (depth * 2) + 3; i++) { 15734 spaces.append(' ').append(' '); 15735 } 15736 return spaces.toString(); 15737 } 15738 15739 /** 15740 * <p>Return the offset of the widget's text baseline from the widget's top 15741 * boundary. If this widget does not support baseline alignment, this 15742 * method returns -1. </p> 15743 * 15744 * @return the offset of the baseline within the widget's bounds or -1 15745 * if baseline alignment is not supported 15746 */ 15747 @ViewDebug.ExportedProperty(category = "layout") 15748 public int getBaseline() { 15749 return -1; 15750 } 15751 15752 /** 15753 * Returns whether the view hierarchy is currently undergoing a layout pass. This 15754 * information is useful to avoid situations such as calling {@link #requestLayout()} during 15755 * a layout pass. 15756 * 15757 * @return whether the view hierarchy is currently undergoing a layout pass 15758 */ 15759 public boolean isInLayout() { 15760 ViewRootImpl viewRoot = getViewRootImpl(); 15761 return (viewRoot != null && viewRoot.isInLayout()); 15762 } 15763 15764 /** 15765 * Call this when something has changed which has invalidated the 15766 * layout of this view. This will schedule a layout pass of the view 15767 * tree. This should not be called while the view hierarchy is currently in a layout 15768 * pass ({@link #isInLayout()}. If layout is happening, the request may be honored at the 15769 * end of the current layout pass (and then layout will run again) or after the current 15770 * frame is drawn and the next layout occurs. 15771 * 15772 * <p>Subclasses which override this method should call the superclass method to 15773 * handle possible request-during-layout errors correctly.</p> 15774 */ 15775 public void requestLayout() { 15776 if (mAttachInfo != null && mAttachInfo.mViewRequestingLayout == null) { 15777 // Only trigger request-during-layout logic if this is the view requesting it, 15778 // not the views in its parent hierarchy 15779 ViewRootImpl viewRoot = getViewRootImpl(); 15780 if (viewRoot != null && viewRoot.isInLayout()) { 15781 if (!viewRoot.requestLayoutDuringLayout(this)) { 15782 return; 15783 } 15784 } 15785 mAttachInfo.mViewRequestingLayout = this; 15786 } 15787 15788 mPrivateFlags |= PFLAG_FORCE_LAYOUT; 15789 mPrivateFlags |= PFLAG_INVALIDATED; 15790 15791 if (mParent != null && !mParent.isLayoutRequested()) { 15792 mParent.requestLayout(); 15793 } 15794 if (mAttachInfo != null && mAttachInfo.mViewRequestingLayout == this) { 15795 mAttachInfo.mViewRequestingLayout = null; 15796 } 15797 } 15798 15799 /** 15800 * Forces this view to be laid out during the next layout pass. 15801 * This method does not call requestLayout() or forceLayout() 15802 * on the parent. 15803 */ 15804 public void forceLayout() { 15805 mPrivateFlags |= PFLAG_FORCE_LAYOUT; 15806 mPrivateFlags |= PFLAG_INVALIDATED; 15807 } 15808 15809 /** 15810 * <p> 15811 * This is called to find out how big a view should be. The parent 15812 * supplies constraint information in the width and height parameters. 15813 * </p> 15814 * 15815 * <p> 15816 * The actual measurement work of a view is performed in 15817 * {@link #onMeasure(int, int)}, called by this method. Therefore, only 15818 * {@link #onMeasure(int, int)} can and must be overridden by subclasses. 15819 * </p> 15820 * 15821 * 15822 * @param widthMeasureSpec Horizontal space requirements as imposed by the 15823 * parent 15824 * @param heightMeasureSpec Vertical space requirements as imposed by the 15825 * parent 15826 * 15827 * @see #onMeasure(int, int) 15828 */ 15829 public final void measure(int widthMeasureSpec, int heightMeasureSpec) { 15830 boolean optical = isLayoutModeOptical(this); 15831 if (optical != isLayoutModeOptical(mParent)) { 15832 Insets insets = getOpticalInsets(); 15833 int oWidth = insets.left + insets.right; 15834 int oHeight = insets.top + insets.bottom; 15835 widthMeasureSpec = MeasureSpec.adjust(widthMeasureSpec, optical ? -oWidth : oWidth); 15836 heightMeasureSpec = MeasureSpec.adjust(heightMeasureSpec, optical ? -oHeight : oHeight); 15837 } 15838 if ((mPrivateFlags & PFLAG_FORCE_LAYOUT) == PFLAG_FORCE_LAYOUT || 15839 widthMeasureSpec != mOldWidthMeasureSpec || 15840 heightMeasureSpec != mOldHeightMeasureSpec) { 15841 15842 // first clears the measured dimension flag 15843 mPrivateFlags &= ~PFLAG_MEASURED_DIMENSION_SET; 15844 15845 resolveRtlPropertiesIfNeeded(); 15846 15847 // measure ourselves, this should set the measured dimension flag back 15848 onMeasure(widthMeasureSpec, heightMeasureSpec); 15849 15850 // flag not set, setMeasuredDimension() was not invoked, we raise 15851 // an exception to warn the developer 15852 if ((mPrivateFlags & PFLAG_MEASURED_DIMENSION_SET) != PFLAG_MEASURED_DIMENSION_SET) { 15853 throw new IllegalStateException("onMeasure() did not set the" 15854 + " measured dimension by calling" 15855 + " setMeasuredDimension()"); 15856 } 15857 15858 mPrivateFlags |= PFLAG_LAYOUT_REQUIRED; 15859 } 15860 15861 mOldWidthMeasureSpec = widthMeasureSpec; 15862 mOldHeightMeasureSpec = heightMeasureSpec; 15863 } 15864 15865 /** 15866 * <p> 15867 * Measure the view and its content to determine the measured width and the 15868 * measured height. This method is invoked by {@link #measure(int, int)} and 15869 * should be overriden by subclasses to provide accurate and efficient 15870 * measurement of their contents. 15871 * </p> 15872 * 15873 * <p> 15874 * <strong>CONTRACT:</strong> When overriding this method, you 15875 * <em>must</em> call {@link #setMeasuredDimension(int, int)} to store the 15876 * measured width and height of this view. Failure to do so will trigger an 15877 * <code>IllegalStateException</code>, thrown by 15878 * {@link #measure(int, int)}. Calling the superclass' 15879 * {@link #onMeasure(int, int)} is a valid use. 15880 * </p> 15881 * 15882 * <p> 15883 * The base class implementation of measure defaults to the background size, 15884 * unless a larger size is allowed by the MeasureSpec. Subclasses should 15885 * override {@link #onMeasure(int, int)} to provide better measurements of 15886 * their content. 15887 * </p> 15888 * 15889 * <p> 15890 * If this method is overridden, it is the subclass's responsibility to make 15891 * sure the measured height and width are at least the view's minimum height 15892 * and width ({@link #getSuggestedMinimumHeight()} and 15893 * {@link #getSuggestedMinimumWidth()}). 15894 * </p> 15895 * 15896 * @param widthMeasureSpec horizontal space requirements as imposed by the parent. 15897 * The requirements are encoded with 15898 * {@link android.view.View.MeasureSpec}. 15899 * @param heightMeasureSpec vertical space requirements as imposed by the parent. 15900 * The requirements are encoded with 15901 * {@link android.view.View.MeasureSpec}. 15902 * 15903 * @see #getMeasuredWidth() 15904 * @see #getMeasuredHeight() 15905 * @see #setMeasuredDimension(int, int) 15906 * @see #getSuggestedMinimumHeight() 15907 * @see #getSuggestedMinimumWidth() 15908 * @see android.view.View.MeasureSpec#getMode(int) 15909 * @see android.view.View.MeasureSpec#getSize(int) 15910 */ 15911 protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) { 15912 setMeasuredDimension(getDefaultSize(getSuggestedMinimumWidth(), widthMeasureSpec), 15913 getDefaultSize(getSuggestedMinimumHeight(), heightMeasureSpec)); 15914 } 15915 15916 /** 15917 * <p>This method must be called by {@link #onMeasure(int, int)} to store the 15918 * measured width and measured height. Failing to do so will trigger an 15919 * exception at measurement time.</p> 15920 * 15921 * @param measuredWidth The measured width of this view. May be a complex 15922 * bit mask as defined by {@link #MEASURED_SIZE_MASK} and 15923 * {@link #MEASURED_STATE_TOO_SMALL}. 15924 * @param measuredHeight The measured height of this view. May be a complex 15925 * bit mask as defined by {@link #MEASURED_SIZE_MASK} and 15926 * {@link #MEASURED_STATE_TOO_SMALL}. 15927 */ 15928 protected final void setMeasuredDimension(int measuredWidth, int measuredHeight) { 15929 boolean optical = isLayoutModeOptical(this); 15930 if (optical != isLayoutModeOptical(mParent)) { 15931 Insets insets = getOpticalInsets(); 15932 int opticalWidth = insets.left + insets.right; 15933 int opticalHeight = insets.top + insets.bottom; 15934 15935 measuredWidth += optical ? opticalWidth : -opticalWidth; 15936 measuredHeight += optical ? opticalHeight : -opticalHeight; 15937 } 15938 mMeasuredWidth = measuredWidth; 15939 mMeasuredHeight = measuredHeight; 15940 15941 mPrivateFlags |= PFLAG_MEASURED_DIMENSION_SET; 15942 } 15943 15944 /** 15945 * Merge two states as returned by {@link #getMeasuredState()}. 15946 * @param curState The current state as returned from a view or the result 15947 * of combining multiple views. 15948 * @param newState The new view state to combine. 15949 * @return Returns a new integer reflecting the combination of the two 15950 * states. 15951 */ 15952 public static int combineMeasuredStates(int curState, int newState) { 15953 return curState | newState; 15954 } 15955 15956 /** 15957 * Version of {@link #resolveSizeAndState(int, int, int)} 15958 * returning only the {@link #MEASURED_SIZE_MASK} bits of the result. 15959 */ 15960 public static int resolveSize(int size, int measureSpec) { 15961 return resolveSizeAndState(size, measureSpec, 0) & MEASURED_SIZE_MASK; 15962 } 15963 15964 /** 15965 * Utility to reconcile a desired size and state, with constraints imposed 15966 * by a MeasureSpec. Will take the desired size, unless a different size 15967 * is imposed by the constraints. The returned value is a compound integer, 15968 * with the resolved size in the {@link #MEASURED_SIZE_MASK} bits and 15969 * optionally the bit {@link #MEASURED_STATE_TOO_SMALL} set if the resulting 15970 * size is smaller than the size the view wants to be. 15971 * 15972 * @param size How big the view wants to be 15973 * @param measureSpec Constraints imposed by the parent 15974 * @return Size information bit mask as defined by 15975 * {@link #MEASURED_SIZE_MASK} and {@link #MEASURED_STATE_TOO_SMALL}. 15976 */ 15977 public static int resolveSizeAndState(int size, int measureSpec, int childMeasuredState) { 15978 int result = size; 15979 int specMode = MeasureSpec.getMode(measureSpec); 15980 int specSize = MeasureSpec.getSize(measureSpec); 15981 switch (specMode) { 15982 case MeasureSpec.UNSPECIFIED: 15983 result = size; 15984 break; 15985 case MeasureSpec.AT_MOST: 15986 if (specSize < size) { 15987 result = specSize | MEASURED_STATE_TOO_SMALL; 15988 } else { 15989 result = size; 15990 } 15991 break; 15992 case MeasureSpec.EXACTLY: 15993 result = specSize; 15994 break; 15995 } 15996 return result | (childMeasuredState&MEASURED_STATE_MASK); 15997 } 15998 15999 /** 16000 * Utility to return a default size. Uses the supplied size if the 16001 * MeasureSpec imposed no constraints. Will get larger if allowed 16002 * by the MeasureSpec. 16003 * 16004 * @param size Default size for this view 16005 * @param measureSpec Constraints imposed by the parent 16006 * @return The size this view should be. 16007 */ 16008 public static int getDefaultSize(int size, int measureSpec) { 16009 int result = size; 16010 int specMode = MeasureSpec.getMode(measureSpec); 16011 int specSize = MeasureSpec.getSize(measureSpec); 16012 16013 switch (specMode) { 16014 case MeasureSpec.UNSPECIFIED: 16015 result = size; 16016 break; 16017 case MeasureSpec.AT_MOST: 16018 case MeasureSpec.EXACTLY: 16019 result = specSize; 16020 break; 16021 } 16022 return result; 16023 } 16024 16025 /** 16026 * Returns the suggested minimum height that the view should use. This 16027 * returns the maximum of the view's minimum height 16028 * and the background's minimum height 16029 * ({@link android.graphics.drawable.Drawable#getMinimumHeight()}). 16030 * <p> 16031 * When being used in {@link #onMeasure(int, int)}, the caller should still 16032 * ensure the returned height is within the requirements of the parent. 16033 * 16034 * @return The suggested minimum height of the view. 16035 */ 16036 protected int getSuggestedMinimumHeight() { 16037 return (mBackground == null) ? mMinHeight : max(mMinHeight, mBackground.getMinimumHeight()); 16038 16039 } 16040 16041 /** 16042 * Returns the suggested minimum width that the view should use. This 16043 * returns the maximum of the view's minimum width) 16044 * and the background's minimum width 16045 * ({@link android.graphics.drawable.Drawable#getMinimumWidth()}). 16046 * <p> 16047 * When being used in {@link #onMeasure(int, int)}, the caller should still 16048 * ensure the returned width is within the requirements of the parent. 16049 * 16050 * @return The suggested minimum width of the view. 16051 */ 16052 protected int getSuggestedMinimumWidth() { 16053 return (mBackground == null) ? mMinWidth : max(mMinWidth, mBackground.getMinimumWidth()); 16054 } 16055 16056 /** 16057 * Returns the minimum height of the view. 16058 * 16059 * @return the minimum height the view will try to be. 16060 * 16061 * @see #setMinimumHeight(int) 16062 * 16063 * @attr ref android.R.styleable#View_minHeight 16064 */ 16065 public int getMinimumHeight() { 16066 return mMinHeight; 16067 } 16068 16069 /** 16070 * Sets the minimum height of the view. It is not guaranteed the view will 16071 * be able to achieve this minimum height (for example, if its parent layout 16072 * constrains it with less available height). 16073 * 16074 * @param minHeight The minimum height the view will try to be. 16075 * 16076 * @see #getMinimumHeight() 16077 * 16078 * @attr ref android.R.styleable#View_minHeight 16079 */ 16080 public void setMinimumHeight(int minHeight) { 16081 mMinHeight = minHeight; 16082 requestLayout(); 16083 } 16084 16085 /** 16086 * Returns the minimum width of the view. 16087 * 16088 * @return the minimum width the view will try to be. 16089 * 16090 * @see #setMinimumWidth(int) 16091 * 16092 * @attr ref android.R.styleable#View_minWidth 16093 */ 16094 public int getMinimumWidth() { 16095 return mMinWidth; 16096 } 16097 16098 /** 16099 * Sets the minimum width of the view. It is not guaranteed the view will 16100 * be able to achieve this minimum width (for example, if its parent layout 16101 * constrains it with less available width). 16102 * 16103 * @param minWidth The minimum width the view will try to be. 16104 * 16105 * @see #getMinimumWidth() 16106 * 16107 * @attr ref android.R.styleable#View_minWidth 16108 */ 16109 public void setMinimumWidth(int minWidth) { 16110 mMinWidth = minWidth; 16111 requestLayout(); 16112 16113 } 16114 16115 /** 16116 * Get the animation currently associated with this view. 16117 * 16118 * @return The animation that is currently playing or 16119 * scheduled to play for this view. 16120 */ 16121 public Animation getAnimation() { 16122 return mCurrentAnimation; 16123 } 16124 16125 /** 16126 * Start the specified animation now. 16127 * 16128 * @param animation the animation to start now 16129 */ 16130 public void startAnimation(Animation animation) { 16131 animation.setStartTime(Animation.START_ON_FIRST_FRAME); 16132 setAnimation(animation); 16133 invalidateParentCaches(); 16134 invalidate(true); 16135 } 16136 16137 /** 16138 * Cancels any animations for this view. 16139 */ 16140 public void clearAnimation() { 16141 if (mCurrentAnimation != null) { 16142 mCurrentAnimation.detach(); 16143 } 16144 mCurrentAnimation = null; 16145 invalidateParentIfNeeded(); 16146 } 16147 16148 /** 16149 * Sets the next animation to play for this view. 16150 * If you want the animation to play immediately, use 16151 * {@link #startAnimation(android.view.animation.Animation)} instead. 16152 * This method provides allows fine-grained 16153 * control over the start time and invalidation, but you 16154 * must make sure that 1) the animation has a start time set, and 16155 * 2) the view's parent (which controls animations on its children) 16156 * will be invalidated when the animation is supposed to 16157 * start. 16158 * 16159 * @param animation The next animation, or null. 16160 */ 16161 public void setAnimation(Animation animation) { 16162 mCurrentAnimation = animation; 16163 16164 if (animation != null) { 16165 // If the screen is off assume the animation start time is now instead of 16166 // the next frame we draw. Keeping the START_ON_FIRST_FRAME start time 16167 // would cause the animation to start when the screen turns back on 16168 if (mAttachInfo != null && !mAttachInfo.mScreenOn && 16169 animation.getStartTime() == Animation.START_ON_FIRST_FRAME) { 16170 animation.setStartTime(AnimationUtils.currentAnimationTimeMillis()); 16171 } 16172 animation.reset(); 16173 } 16174 } 16175 16176 /** 16177 * Invoked by a parent ViewGroup to notify the start of the animation 16178 * currently associated with this view. If you override this method, 16179 * always call super.onAnimationStart(); 16180 * 16181 * @see #setAnimation(android.view.animation.Animation) 16182 * @see #getAnimation() 16183 */ 16184 protected void onAnimationStart() { 16185 mPrivateFlags |= PFLAG_ANIMATION_STARTED; 16186 } 16187 16188 /** 16189 * Invoked by a parent ViewGroup to notify the end of the animation 16190 * currently associated with this view. If you override this method, 16191 * always call super.onAnimationEnd(); 16192 * 16193 * @see #setAnimation(android.view.animation.Animation) 16194 * @see #getAnimation() 16195 */ 16196 protected void onAnimationEnd() { 16197 mPrivateFlags &= ~PFLAG_ANIMATION_STARTED; 16198 } 16199 16200 /** 16201 * Invoked if there is a Transform that involves alpha. Subclass that can 16202 * draw themselves with the specified alpha should return true, and then 16203 * respect that alpha when their onDraw() is called. If this returns false 16204 * then the view may be redirected to draw into an offscreen buffer to 16205 * fulfill the request, which will look fine, but may be slower than if the 16206 * subclass handles it internally. The default implementation returns false. 16207 * 16208 * @param alpha The alpha (0..255) to apply to the view's drawing 16209 * @return true if the view can draw with the specified alpha. 16210 */ 16211 protected boolean onSetAlpha(int alpha) { 16212 return false; 16213 } 16214 16215 /** 16216 * This is used by the RootView to perform an optimization when 16217 * the view hierarchy contains one or several SurfaceView. 16218 * SurfaceView is always considered transparent, but its children are not, 16219 * therefore all View objects remove themselves from the global transparent 16220 * region (passed as a parameter to this function). 16221 * 16222 * @param region The transparent region for this ViewAncestor (window). 16223 * 16224 * @return Returns true if the effective visibility of the view at this 16225 * point is opaque, regardless of the transparent region; returns false 16226 * if it is possible for underlying windows to be seen behind the view. 16227 * 16228 * {@hide} 16229 */ 16230 public boolean gatherTransparentRegion(Region region) { 16231 final AttachInfo attachInfo = mAttachInfo; 16232 if (region != null && attachInfo != null) { 16233 final int pflags = mPrivateFlags; 16234 if ((pflags & PFLAG_SKIP_DRAW) == 0) { 16235 // The SKIP_DRAW flag IS NOT set, so this view draws. We need to 16236 // remove it from the transparent region. 16237 final int[] location = attachInfo.mTransparentLocation; 16238 getLocationInWindow(location); 16239 region.op(location[0], location[1], location[0] + mRight - mLeft, 16240 location[1] + mBottom - mTop, Region.Op.DIFFERENCE); 16241 } else if ((pflags & PFLAG_ONLY_DRAWS_BACKGROUND) != 0 && mBackground != null) { 16242 // The ONLY_DRAWS_BACKGROUND flag IS set and the background drawable 16243 // exists, so we remove the background drawable's non-transparent 16244 // parts from this transparent region. 16245 applyDrawableToTransparentRegion(mBackground, region); 16246 } 16247 } 16248 return true; 16249 } 16250 16251 /** 16252 * Play a sound effect for this view. 16253 * 16254 * <p>The framework will play sound effects for some built in actions, such as 16255 * clicking, but you may wish to play these effects in your widget, 16256 * for instance, for internal navigation. 16257 * 16258 * <p>The sound effect will only be played if sound effects are enabled by the user, and 16259 * {@link #isSoundEffectsEnabled()} is true. 16260 * 16261 * @param soundConstant One of the constants defined in {@link SoundEffectConstants} 16262 */ 16263 public void playSoundEffect(int soundConstant) { 16264 if (mAttachInfo == null || mAttachInfo.mRootCallbacks == null || !isSoundEffectsEnabled()) { 16265 return; 16266 } 16267 mAttachInfo.mRootCallbacks.playSoundEffect(soundConstant); 16268 } 16269 16270 /** 16271 * BZZZTT!!1! 16272 * 16273 * <p>Provide haptic feedback to the user for this view. 16274 * 16275 * <p>The framework will provide haptic feedback for some built in actions, 16276 * such as long presses, but you may wish to provide feedback for your 16277 * own widget. 16278 * 16279 * <p>The feedback will only be performed if 16280 * {@link #isHapticFeedbackEnabled()} is true. 16281 * 16282 * @param feedbackConstant One of the constants defined in 16283 * {@link HapticFeedbackConstants} 16284 */ 16285 public boolean performHapticFeedback(int feedbackConstant) { 16286 return performHapticFeedback(feedbackConstant, 0); 16287 } 16288 16289 /** 16290 * BZZZTT!!1! 16291 * 16292 * <p>Like {@link #performHapticFeedback(int)}, with additional options. 16293 * 16294 * @param feedbackConstant One of the constants defined in 16295 * {@link HapticFeedbackConstants} 16296 * @param flags Additional flags as per {@link HapticFeedbackConstants}. 16297 */ 16298 public boolean performHapticFeedback(int feedbackConstant, int flags) { 16299 if (mAttachInfo == null) { 16300 return false; 16301 } 16302 //noinspection SimplifiableIfStatement 16303 if ((flags & HapticFeedbackConstants.FLAG_IGNORE_VIEW_SETTING) == 0 16304 && !isHapticFeedbackEnabled()) { 16305 return false; 16306 } 16307 return mAttachInfo.mRootCallbacks.performHapticFeedback(feedbackConstant, 16308 (flags & HapticFeedbackConstants.FLAG_IGNORE_GLOBAL_SETTING) != 0); 16309 } 16310 16311 /** 16312 * Request that the visibility of the status bar or other screen/window 16313 * decorations be changed. 16314 * 16315 * <p>This method is used to put the over device UI into temporary modes 16316 * where the user's attention is focused more on the application content, 16317 * by dimming or hiding surrounding system affordances. This is typically 16318 * used in conjunction with {@link Window#FEATURE_ACTION_BAR_OVERLAY 16319 * Window.FEATURE_ACTION_BAR_OVERLAY}, allowing the applications content 16320 * to be placed behind the action bar (and with these flags other system 16321 * affordances) so that smooth transitions between hiding and showing them 16322 * can be done. 16323 * 16324 * <p>Two representative examples of the use of system UI visibility is 16325 * implementing a content browsing application (like a magazine reader) 16326 * and a video playing application. 16327 * 16328 * <p>The first code shows a typical implementation of a View in a content 16329 * browsing application. In this implementation, the application goes 16330 * into a content-oriented mode by hiding the status bar and action bar, 16331 * and putting the navigation elements into lights out mode. The user can 16332 * then interact with content while in this mode. Such an application should 16333 * provide an easy way for the user to toggle out of the mode (such as to 16334 * check information in the status bar or access notifications). In the 16335 * implementation here, this is done simply by tapping on the content. 16336 * 16337 * {@sample development/samples/ApiDemos/src/com/example/android/apis/view/ContentBrowserActivity.java 16338 * content} 16339 * 16340 * <p>This second code sample shows a typical implementation of a View 16341 * in a video playing application. In this situation, while the video is 16342 * playing the application would like to go into a complete full-screen mode, 16343 * to use as much of the display as possible for the video. When in this state 16344 * the user can not interact with the application; the system intercepts 16345 * touching on the screen to pop the UI out of full screen mode. See 16346 * {@link #fitSystemWindows(Rect)} for a sample layout that goes with this code. 16347 * 16348 * {@sample development/samples/ApiDemos/src/com/example/android/apis/view/VideoPlayerActivity.java 16349 * content} 16350 * 16351 * @param visibility Bitwise-or of flags {@link #SYSTEM_UI_FLAG_LOW_PROFILE}, 16352 * {@link #SYSTEM_UI_FLAG_HIDE_NAVIGATION}, {@link #SYSTEM_UI_FLAG_FULLSCREEN}, 16353 * {@link #SYSTEM_UI_FLAG_LAYOUT_STABLE}, {@link #SYSTEM_UI_FLAG_LAYOUT_HIDE_NAVIGATION}, 16354 * and {@link #SYSTEM_UI_FLAG_LAYOUT_FULLSCREEN}. 16355 */ 16356 public void setSystemUiVisibility(int visibility) { 16357 if (visibility != mSystemUiVisibility) { 16358 mSystemUiVisibility = visibility; 16359 if (mParent != null && mAttachInfo != null && !mAttachInfo.mRecomputeGlobalAttributes) { 16360 mParent.recomputeViewAttributes(this); 16361 } 16362 } 16363 } 16364 16365 /** 16366 * Returns the last {@link #setSystemUiVisibility(int) that this view has requested. 16367 * @return Bitwise-or of flags {@link #SYSTEM_UI_FLAG_LOW_PROFILE}, 16368 * {@link #SYSTEM_UI_FLAG_HIDE_NAVIGATION}, {@link #SYSTEM_UI_FLAG_FULLSCREEN}, 16369 * {@link #SYSTEM_UI_FLAG_LAYOUT_STABLE}, {@link #SYSTEM_UI_FLAG_LAYOUT_HIDE_NAVIGATION}, 16370 * and {@link #SYSTEM_UI_FLAG_LAYOUT_FULLSCREEN}. 16371 */ 16372 public int getSystemUiVisibility() { 16373 return mSystemUiVisibility; 16374 } 16375 16376 /** 16377 * Returns the current system UI visibility that is currently set for 16378 * the entire window. This is the combination of the 16379 * {@link #setSystemUiVisibility(int)} values supplied by all of the 16380 * views in the window. 16381 */ 16382 public int getWindowSystemUiVisibility() { 16383 return mAttachInfo != null ? mAttachInfo.mSystemUiVisibility : 0; 16384 } 16385 16386 /** 16387 * Override to find out when the window's requested system UI visibility 16388 * has changed, that is the value returned by {@link #getWindowSystemUiVisibility()}. 16389 * This is different from the callbacks recieved through 16390 * {@link #setOnSystemUiVisibilityChangeListener(OnSystemUiVisibilityChangeListener)} 16391 * in that this is only telling you about the local request of the window, 16392 * not the actual values applied by the system. 16393 */ 16394 public void onWindowSystemUiVisibilityChanged(int visible) { 16395 } 16396 16397 /** 16398 * Dispatch callbacks to {@link #onWindowSystemUiVisibilityChanged(int)} down 16399 * the view hierarchy. 16400 */ 16401 public void dispatchWindowSystemUiVisiblityChanged(int visible) { 16402 onWindowSystemUiVisibilityChanged(visible); 16403 } 16404 16405 /** 16406 * Set a listener to receive callbacks when the visibility of the system bar changes. 16407 * @param l The {@link OnSystemUiVisibilityChangeListener} to receive callbacks. 16408 */ 16409 public void setOnSystemUiVisibilityChangeListener(OnSystemUiVisibilityChangeListener l) { 16410 getListenerInfo().mOnSystemUiVisibilityChangeListener = l; 16411 if (mParent != null && mAttachInfo != null && !mAttachInfo.mRecomputeGlobalAttributes) { 16412 mParent.recomputeViewAttributes(this); 16413 } 16414 } 16415 16416 /** 16417 * Dispatch callbacks to {@link #setOnSystemUiVisibilityChangeListener} down 16418 * the view hierarchy. 16419 */ 16420 public void dispatchSystemUiVisibilityChanged(int visibility) { 16421 ListenerInfo li = mListenerInfo; 16422 if (li != null && li.mOnSystemUiVisibilityChangeListener != null) { 16423 li.mOnSystemUiVisibilityChangeListener.onSystemUiVisibilityChange( 16424 visibility & PUBLIC_STATUS_BAR_VISIBILITY_MASK); 16425 } 16426 } 16427 16428 boolean updateLocalSystemUiVisibility(int localValue, int localChanges) { 16429 int val = (mSystemUiVisibility&~localChanges) | (localValue&localChanges); 16430 if (val != mSystemUiVisibility) { 16431 setSystemUiVisibility(val); 16432 return true; 16433 } 16434 return false; 16435 } 16436 16437 /** @hide */ 16438 public void setDisabledSystemUiVisibility(int flags) { 16439 if (mAttachInfo != null) { 16440 if (mAttachInfo.mDisabledSystemUiVisibility != flags) { 16441 mAttachInfo.mDisabledSystemUiVisibility = flags; 16442 if (mParent != null) { 16443 mParent.recomputeViewAttributes(this); 16444 } 16445 } 16446 } 16447 } 16448 16449 /** 16450 * Creates an image that the system displays during the drag and drop 16451 * operation. This is called a "drag shadow". The default implementation 16452 * for a DragShadowBuilder based on a View returns an image that has exactly the same 16453 * appearance as the given View. The default also positions the center of the drag shadow 16454 * directly under the touch point. If no View is provided (the constructor with no parameters 16455 * is used), and {@link #onProvideShadowMetrics(Point,Point) onProvideShadowMetrics()} and 16456 * {@link #onDrawShadow(Canvas) onDrawShadow()} are not overriden, then the 16457 * default is an invisible drag shadow. 16458 * <p> 16459 * You are not required to use the View you provide to the constructor as the basis of the 16460 * drag shadow. The {@link #onDrawShadow(Canvas) onDrawShadow()} method allows you to draw 16461 * anything you want as the drag shadow. 16462 * </p> 16463 * <p> 16464 * You pass a DragShadowBuilder object to the system when you start the drag. The system 16465 * calls {@link #onProvideShadowMetrics(Point,Point) onProvideShadowMetrics()} to get the 16466 * size and position of the drag shadow. It uses this data to construct a 16467 * {@link android.graphics.Canvas} object, then it calls {@link #onDrawShadow(Canvas) onDrawShadow()} 16468 * so that your application can draw the shadow image in the Canvas. 16469 * </p> 16470 * 16471 * <div class="special reference"> 16472 * <h3>Developer Guides</h3> 16473 * <p>For a guide to implementing drag and drop features, read the 16474 * <a href="{@docRoot}guide/topics/ui/drag-drop.html">Drag and Drop</a> developer guide.</p> 16475 * </div> 16476 */ 16477 public static class DragShadowBuilder { 16478 private final WeakReference<View> mView; 16479 16480 /** 16481 * Constructs a shadow image builder based on a View. By default, the resulting drag 16482 * shadow will have the same appearance and dimensions as the View, with the touch point 16483 * over the center of the View. 16484 * @param view A View. Any View in scope can be used. 16485 */ 16486 public DragShadowBuilder(View view) { 16487 mView = new WeakReference<View>(view); 16488 } 16489 16490 /** 16491 * Construct a shadow builder object with no associated View. This 16492 * constructor variant is only useful when the {@link #onProvideShadowMetrics(Point, Point)} 16493 * and {@link #onDrawShadow(Canvas)} methods are also overridden in order 16494 * to supply the drag shadow's dimensions and appearance without 16495 * reference to any View object. If they are not overridden, then the result is an 16496 * invisible drag shadow. 16497 */ 16498 public DragShadowBuilder() { 16499 mView = new WeakReference<View>(null); 16500 } 16501 16502 /** 16503 * Returns the View object that had been passed to the 16504 * {@link #View.DragShadowBuilder(View)} 16505 * constructor. If that View parameter was {@code null} or if the 16506 * {@link #View.DragShadowBuilder()} 16507 * constructor was used to instantiate the builder object, this method will return 16508 * null. 16509 * 16510 * @return The View object associate with this builder object. 16511 */ 16512 @SuppressWarnings({"JavadocReference"}) 16513 final public View getView() { 16514 return mView.get(); 16515 } 16516 16517 /** 16518 * Provides the metrics for the shadow image. These include the dimensions of 16519 * the shadow image, and the point within that shadow that should 16520 * be centered under the touch location while dragging. 16521 * <p> 16522 * The default implementation sets the dimensions of the shadow to be the 16523 * same as the dimensions of the View itself and centers the shadow under 16524 * the touch point. 16525 * </p> 16526 * 16527 * @param shadowSize A {@link android.graphics.Point} containing the width and height 16528 * of the shadow image. Your application must set {@link android.graphics.Point#x} to the 16529 * desired width and must set {@link android.graphics.Point#y} to the desired height of the 16530 * image. 16531 * 16532 * @param shadowTouchPoint A {@link android.graphics.Point} for the position within the 16533 * shadow image that should be underneath the touch point during the drag and drop 16534 * operation. Your application must set {@link android.graphics.Point#x} to the 16535 * X coordinate and {@link android.graphics.Point#y} to the Y coordinate of this position. 16536 */ 16537 public void onProvideShadowMetrics(Point shadowSize, Point shadowTouchPoint) { 16538 final View view = mView.get(); 16539 if (view != null) { 16540 shadowSize.set(view.getWidth(), view.getHeight()); 16541 shadowTouchPoint.set(shadowSize.x / 2, shadowSize.y / 2); 16542 } else { 16543 Log.e(View.VIEW_LOG_TAG, "Asked for drag thumb metrics but no view"); 16544 } 16545 } 16546 16547 /** 16548 * Draws the shadow image. The system creates the {@link android.graphics.Canvas} object 16549 * based on the dimensions it received from the 16550 * {@link #onProvideShadowMetrics(Point, Point)} callback. 16551 * 16552 * @param canvas A {@link android.graphics.Canvas} object in which to draw the shadow image. 16553 */ 16554 public void onDrawShadow(Canvas canvas) { 16555 final View view = mView.get(); 16556 if (view != null) { 16557 view.draw(canvas); 16558 } else { 16559 Log.e(View.VIEW_LOG_TAG, "Asked to draw drag shadow but no view"); 16560 } 16561 } 16562 } 16563 16564 /** 16565 * Starts a drag and drop operation. When your application calls this method, it passes a 16566 * {@link android.view.View.DragShadowBuilder} object to the system. The 16567 * system calls this object's {@link DragShadowBuilder#onProvideShadowMetrics(Point, Point)} 16568 * to get metrics for the drag shadow, and then calls the object's 16569 * {@link DragShadowBuilder#onDrawShadow(Canvas)} to draw the drag shadow itself. 16570 * <p> 16571 * Once the system has the drag shadow, it begins the drag and drop operation by sending 16572 * drag events to all the View objects in your application that are currently visible. It does 16573 * this either by calling the View object's drag listener (an implementation of 16574 * {@link android.view.View.OnDragListener#onDrag(View,DragEvent) onDrag()} or by calling the 16575 * View object's {@link android.view.View#onDragEvent(DragEvent) onDragEvent()} method. 16576 * Both are passed a {@link android.view.DragEvent} object that has a 16577 * {@link android.view.DragEvent#getAction()} value of 16578 * {@link android.view.DragEvent#ACTION_DRAG_STARTED}. 16579 * </p> 16580 * <p> 16581 * Your application can invoke startDrag() on any attached View object. The View object does not 16582 * need to be the one used in {@link android.view.View.DragShadowBuilder}, nor does it need to 16583 * be related to the View the user selected for dragging. 16584 * </p> 16585 * @param data A {@link android.content.ClipData} object pointing to the data to be 16586 * transferred by the drag and drop operation. 16587 * @param shadowBuilder A {@link android.view.View.DragShadowBuilder} object for building the 16588 * drag shadow. 16589 * @param myLocalState An {@link java.lang.Object} containing local data about the drag and 16590 * drop operation. This Object is put into every DragEvent object sent by the system during the 16591 * current drag. 16592 * <p> 16593 * myLocalState is a lightweight mechanism for the sending information from the dragged View 16594 * to the target Views. For example, it can contain flags that differentiate between a 16595 * a copy operation and a move operation. 16596 * </p> 16597 * @param flags Flags that control the drag and drop operation. No flags are currently defined, 16598 * so the parameter should be set to 0. 16599 * @return {@code true} if the method completes successfully, or 16600 * {@code false} if it fails anywhere. Returning {@code false} means the system was unable to 16601 * do a drag, and so no drag operation is in progress. 16602 */ 16603 public final boolean startDrag(ClipData data, DragShadowBuilder shadowBuilder, 16604 Object myLocalState, int flags) { 16605 if (ViewDebug.DEBUG_DRAG) { 16606 Log.d(VIEW_LOG_TAG, "startDrag: data=" + data + " flags=" + flags); 16607 } 16608 boolean okay = false; 16609 16610 Point shadowSize = new Point(); 16611 Point shadowTouchPoint = new Point(); 16612 shadowBuilder.onProvideShadowMetrics(shadowSize, shadowTouchPoint); 16613 16614 if ((shadowSize.x < 0) || (shadowSize.y < 0) || 16615 (shadowTouchPoint.x < 0) || (shadowTouchPoint.y < 0)) { 16616 throw new IllegalStateException("Drag shadow dimensions must not be negative"); 16617 } 16618 16619 if (ViewDebug.DEBUG_DRAG) { 16620 Log.d(VIEW_LOG_TAG, "drag shadow: width=" + shadowSize.x + " height=" + shadowSize.y 16621 + " shadowX=" + shadowTouchPoint.x + " shadowY=" + shadowTouchPoint.y); 16622 } 16623 Surface surface = new Surface(); 16624 try { 16625 IBinder token = mAttachInfo.mSession.prepareDrag(mAttachInfo.mWindow, 16626 flags, shadowSize.x, shadowSize.y, surface); 16627 if (ViewDebug.DEBUG_DRAG) Log.d(VIEW_LOG_TAG, "prepareDrag returned token=" + token 16628 + " surface=" + surface); 16629 if (token != null) { 16630 Canvas canvas = surface.lockCanvas(null); 16631 try { 16632 canvas.drawColor(0, PorterDuff.Mode.CLEAR); 16633 shadowBuilder.onDrawShadow(canvas); 16634 } finally { 16635 surface.unlockCanvasAndPost(canvas); 16636 } 16637 16638 final ViewRootImpl root = getViewRootImpl(); 16639 16640 // Cache the local state object for delivery with DragEvents 16641 root.setLocalDragState(myLocalState); 16642 16643 // repurpose 'shadowSize' for the last touch point 16644 root.getLastTouchPoint(shadowSize); 16645 16646 okay = mAttachInfo.mSession.performDrag(mAttachInfo.mWindow, token, 16647 shadowSize.x, shadowSize.y, 16648 shadowTouchPoint.x, shadowTouchPoint.y, data); 16649 if (ViewDebug.DEBUG_DRAG) Log.d(VIEW_LOG_TAG, "performDrag returned " + okay); 16650 16651 // Off and running! Release our local surface instance; the drag 16652 // shadow surface is now managed by the system process. 16653 surface.release(); 16654 } 16655 } catch (Exception e) { 16656 Log.e(VIEW_LOG_TAG, "Unable to initiate drag", e); 16657 surface.destroy(); 16658 } 16659 16660 return okay; 16661 } 16662 16663 /** 16664 * Handles drag events sent by the system following a call to 16665 * {@link android.view.View#startDrag(ClipData,DragShadowBuilder,Object,int) startDrag()}. 16666 *<p> 16667 * When the system calls this method, it passes a 16668 * {@link android.view.DragEvent} object. A call to 16669 * {@link android.view.DragEvent#getAction()} returns one of the action type constants defined 16670 * in DragEvent. The method uses these to determine what is happening in the drag and drop 16671 * operation. 16672 * @param event The {@link android.view.DragEvent} sent by the system. 16673 * The {@link android.view.DragEvent#getAction()} method returns an action type constant defined 16674 * in DragEvent, indicating the type of drag event represented by this object. 16675 * @return {@code true} if the method was successful, otherwise {@code false}. 16676 * <p> 16677 * The method should return {@code true} in response to an action type of 16678 * {@link android.view.DragEvent#ACTION_DRAG_STARTED} to receive drag events for the current 16679 * operation. 16680 * </p> 16681 * <p> 16682 * The method should also return {@code true} in response to an action type of 16683 * {@link android.view.DragEvent#ACTION_DROP} if it consumed the drop, or 16684 * {@code false} if it didn't. 16685 * </p> 16686 */ 16687 public boolean onDragEvent(DragEvent event) { 16688 return false; 16689 } 16690 16691 /** 16692 * Detects if this View is enabled and has a drag event listener. 16693 * If both are true, then it calls the drag event listener with the 16694 * {@link android.view.DragEvent} it received. If the drag event listener returns 16695 * {@code true}, then dispatchDragEvent() returns {@code true}. 16696 * <p> 16697 * For all other cases, the method calls the 16698 * {@link android.view.View#onDragEvent(DragEvent) onDragEvent()} drag event handler 16699 * method and returns its result. 16700 * </p> 16701 * <p> 16702 * This ensures that a drag event is always consumed, even if the View does not have a drag 16703 * event listener. However, if the View has a listener and the listener returns true, then 16704 * onDragEvent() is not called. 16705 * </p> 16706 */ 16707 public boolean dispatchDragEvent(DragEvent event) { 16708 //noinspection SimplifiableIfStatement 16709 ListenerInfo li = mListenerInfo; 16710 if (li != null && li.mOnDragListener != null && (mViewFlags & ENABLED_MASK) == ENABLED 16711 && li.mOnDragListener.onDrag(this, event)) { 16712 return true; 16713 } 16714 return onDragEvent(event); 16715 } 16716 16717 boolean canAcceptDrag() { 16718 return (mPrivateFlags2 & PFLAG2_DRAG_CAN_ACCEPT) != 0; 16719 } 16720 16721 /** 16722 * This needs to be a better API (NOT ON VIEW) before it is exposed. If 16723 * it is ever exposed at all. 16724 * @hide 16725 */ 16726 public void onCloseSystemDialogs(String reason) { 16727 } 16728 16729 /** 16730 * Given a Drawable whose bounds have been set to draw into this view, 16731 * update a Region being computed for 16732 * {@link #gatherTransparentRegion(android.graphics.Region)} so 16733 * that any non-transparent parts of the Drawable are removed from the 16734 * given transparent region. 16735 * 16736 * @param dr The Drawable whose transparency is to be applied to the region. 16737 * @param region A Region holding the current transparency information, 16738 * where any parts of the region that are set are considered to be 16739 * transparent. On return, this region will be modified to have the 16740 * transparency information reduced by the corresponding parts of the 16741 * Drawable that are not transparent. 16742 * {@hide} 16743 */ 16744 public void applyDrawableToTransparentRegion(Drawable dr, Region region) { 16745 if (DBG) { 16746 Log.i("View", "Getting transparent region for: " + this); 16747 } 16748 final Region r = dr.getTransparentRegion(); 16749 final Rect db = dr.getBounds(); 16750 final AttachInfo attachInfo = mAttachInfo; 16751 if (r != null && attachInfo != null) { 16752 final int w = getRight()-getLeft(); 16753 final int h = getBottom()-getTop(); 16754 if (db.left > 0) { 16755 //Log.i("VIEW", "Drawable left " + db.left + " > view 0"); 16756 r.op(0, 0, db.left, h, Region.Op.UNION); 16757 } 16758 if (db.right < w) { 16759 //Log.i("VIEW", "Drawable right " + db.right + " < view " + w); 16760 r.op(db.right, 0, w, h, Region.Op.UNION); 16761 } 16762 if (db.top > 0) { 16763 //Log.i("VIEW", "Drawable top " + db.top + " > view 0"); 16764 r.op(0, 0, w, db.top, Region.Op.UNION); 16765 } 16766 if (db.bottom < h) { 16767 //Log.i("VIEW", "Drawable bottom " + db.bottom + " < view " + h); 16768 r.op(0, db.bottom, w, h, Region.Op.UNION); 16769 } 16770 final int[] location = attachInfo.mTransparentLocation; 16771 getLocationInWindow(location); 16772 r.translate(location[0], location[1]); 16773 region.op(r, Region.Op.INTERSECT); 16774 } else { 16775 region.op(db, Region.Op.DIFFERENCE); 16776 } 16777 } 16778 16779 private void checkForLongClick(int delayOffset) { 16780 if ((mViewFlags & LONG_CLICKABLE) == LONG_CLICKABLE) { 16781 mHasPerformedLongPress = false; 16782 16783 if (mPendingCheckForLongPress == null) { 16784 mPendingCheckForLongPress = new CheckForLongPress(); 16785 } 16786 mPendingCheckForLongPress.rememberWindowAttachCount(); 16787 postDelayed(mPendingCheckForLongPress, 16788 ViewConfiguration.getLongPressTimeout() - delayOffset); 16789 } 16790 } 16791 16792 /** 16793 * Inflate a view from an XML resource. This convenience method wraps the {@link 16794 * LayoutInflater} class, which provides a full range of options for view inflation. 16795 * 16796 * @param context The Context object for your activity or application. 16797 * @param resource The resource ID to inflate 16798 * @param root A view group that will be the parent. Used to properly inflate the 16799 * layout_* parameters. 16800 * @see LayoutInflater 16801 */ 16802 public static View inflate(Context context, int resource, ViewGroup root) { 16803 LayoutInflater factory = LayoutInflater.from(context); 16804 return factory.inflate(resource, root); 16805 } 16806 16807 /** 16808 * Scroll the view with standard behavior for scrolling beyond the normal 16809 * content boundaries. Views that call this method should override 16810 * {@link #onOverScrolled(int, int, boolean, boolean)} to respond to the 16811 * results of an over-scroll operation. 16812 * 16813 * Views can use this method to handle any touch or fling-based scrolling. 16814 * 16815 * @param deltaX Change in X in pixels 16816 * @param deltaY Change in Y in pixels 16817 * @param scrollX Current X scroll value in pixels before applying deltaX 16818 * @param scrollY Current Y scroll value in pixels before applying deltaY 16819 * @param scrollRangeX Maximum content scroll range along the X axis 16820 * @param scrollRangeY Maximum content scroll range along the Y axis 16821 * @param maxOverScrollX Number of pixels to overscroll by in either direction 16822 * along the X axis. 16823 * @param maxOverScrollY Number of pixels to overscroll by in either direction 16824 * along the Y axis. 16825 * @param isTouchEvent true if this scroll operation is the result of a touch event. 16826 * @return true if scrolling was clamped to an over-scroll boundary along either 16827 * axis, false otherwise. 16828 */ 16829 @SuppressWarnings({"UnusedParameters"}) 16830 protected boolean overScrollBy(int deltaX, int deltaY, 16831 int scrollX, int scrollY, 16832 int scrollRangeX, int scrollRangeY, 16833 int maxOverScrollX, int maxOverScrollY, 16834 boolean isTouchEvent) { 16835 final int overScrollMode = mOverScrollMode; 16836 final boolean canScrollHorizontal = 16837 computeHorizontalScrollRange() > computeHorizontalScrollExtent(); 16838 final boolean canScrollVertical = 16839 computeVerticalScrollRange() > computeVerticalScrollExtent(); 16840 final boolean overScrollHorizontal = overScrollMode == OVER_SCROLL_ALWAYS || 16841 (overScrollMode == OVER_SCROLL_IF_CONTENT_SCROLLS && canScrollHorizontal); 16842 final boolean overScrollVertical = overScrollMode == OVER_SCROLL_ALWAYS || 16843 (overScrollMode == OVER_SCROLL_IF_CONTENT_SCROLLS && canScrollVertical); 16844 16845 int newScrollX = scrollX + deltaX; 16846 if (!overScrollHorizontal) { 16847 maxOverScrollX = 0; 16848 } 16849 16850 int newScrollY = scrollY + deltaY; 16851 if (!overScrollVertical) { 16852 maxOverScrollY = 0; 16853 } 16854 16855 // Clamp values if at the limits and record 16856 final int left = -maxOverScrollX; 16857 final int right = maxOverScrollX + scrollRangeX; 16858 final int top = -maxOverScrollY; 16859 final int bottom = maxOverScrollY + scrollRangeY; 16860 16861 boolean clampedX = false; 16862 if (newScrollX > right) { 16863 newScrollX = right; 16864 clampedX = true; 16865 } else if (newScrollX < left) { 16866 newScrollX = left; 16867 clampedX = true; 16868 } 16869 16870 boolean clampedY = false; 16871 if (newScrollY > bottom) { 16872 newScrollY = bottom; 16873 clampedY = true; 16874 } else if (newScrollY < top) { 16875 newScrollY = top; 16876 clampedY = true; 16877 } 16878 16879 onOverScrolled(newScrollX, newScrollY, clampedX, clampedY); 16880 16881 return clampedX || clampedY; 16882 } 16883 16884 /** 16885 * Called by {@link #overScrollBy(int, int, int, int, int, int, int, int, boolean)} to 16886 * respond to the results of an over-scroll operation. 16887 * 16888 * @param scrollX New X scroll value in pixels 16889 * @param scrollY New Y scroll value in pixels 16890 * @param clampedX True if scrollX was clamped to an over-scroll boundary 16891 * @param clampedY True if scrollY was clamped to an over-scroll boundary 16892 */ 16893 protected void onOverScrolled(int scrollX, int scrollY, 16894 boolean clampedX, boolean clampedY) { 16895 // Intentionally empty. 16896 } 16897 16898 /** 16899 * Returns the over-scroll mode for this view. The result will be 16900 * one of {@link #OVER_SCROLL_ALWAYS} (default), {@link #OVER_SCROLL_IF_CONTENT_SCROLLS} 16901 * (allow over-scrolling only if the view content is larger than the container), 16902 * or {@link #OVER_SCROLL_NEVER}. 16903 * 16904 * @return This view's over-scroll mode. 16905 */ 16906 public int getOverScrollMode() { 16907 return mOverScrollMode; 16908 } 16909 16910 /** 16911 * Set the over-scroll mode for this view. Valid over-scroll modes are 16912 * {@link #OVER_SCROLL_ALWAYS} (default), {@link #OVER_SCROLL_IF_CONTENT_SCROLLS} 16913 * (allow over-scrolling only if the view content is larger than the container), 16914 * or {@link #OVER_SCROLL_NEVER}. 16915 * 16916 * Setting the over-scroll mode of a view will have an effect only if the 16917 * view is capable of scrolling. 16918 * 16919 * @param overScrollMode The new over-scroll mode for this view. 16920 */ 16921 public void setOverScrollMode(int overScrollMode) { 16922 if (overScrollMode != OVER_SCROLL_ALWAYS && 16923 overScrollMode != OVER_SCROLL_IF_CONTENT_SCROLLS && 16924 overScrollMode != OVER_SCROLL_NEVER) { 16925 throw new IllegalArgumentException("Invalid overscroll mode " + overScrollMode); 16926 } 16927 mOverScrollMode = overScrollMode; 16928 } 16929 16930 /** 16931 * Gets a scale factor that determines the distance the view should scroll 16932 * vertically in response to {@link MotionEvent#ACTION_SCROLL}. 16933 * @return The vertical scroll scale factor. 16934 * @hide 16935 */ 16936 protected float getVerticalScrollFactor() { 16937 if (mVerticalScrollFactor == 0) { 16938 TypedValue outValue = new TypedValue(); 16939 if (!mContext.getTheme().resolveAttribute( 16940 com.android.internal.R.attr.listPreferredItemHeight, outValue, true)) { 16941 throw new IllegalStateException( 16942 "Expected theme to define listPreferredItemHeight."); 16943 } 16944 mVerticalScrollFactor = outValue.getDimension( 16945 mContext.getResources().getDisplayMetrics()); 16946 } 16947 return mVerticalScrollFactor; 16948 } 16949 16950 /** 16951 * Gets a scale factor that determines the distance the view should scroll 16952 * horizontally in response to {@link MotionEvent#ACTION_SCROLL}. 16953 * @return The horizontal scroll scale factor. 16954 * @hide 16955 */ 16956 protected float getHorizontalScrollFactor() { 16957 // TODO: Should use something else. 16958 return getVerticalScrollFactor(); 16959 } 16960 16961 /** 16962 * Return the value specifying the text direction or policy that was set with 16963 * {@link #setTextDirection(int)}. 16964 * 16965 * @return the defined text direction. It can be one of: 16966 * 16967 * {@link #TEXT_DIRECTION_INHERIT}, 16968 * {@link #TEXT_DIRECTION_FIRST_STRONG} 16969 * {@link #TEXT_DIRECTION_ANY_RTL}, 16970 * {@link #TEXT_DIRECTION_LTR}, 16971 * {@link #TEXT_DIRECTION_RTL}, 16972 * {@link #TEXT_DIRECTION_LOCALE} 16973 * 16974 * @attr ref android.R.styleable#View_textDirection 16975 * 16976 * @hide 16977 */ 16978 @ViewDebug.ExportedProperty(category = "text", mapping = { 16979 @ViewDebug.IntToString(from = TEXT_DIRECTION_INHERIT, to = "INHERIT"), 16980 @ViewDebug.IntToString(from = TEXT_DIRECTION_FIRST_STRONG, to = "FIRST_STRONG"), 16981 @ViewDebug.IntToString(from = TEXT_DIRECTION_ANY_RTL, to = "ANY_RTL"), 16982 @ViewDebug.IntToString(from = TEXT_DIRECTION_LTR, to = "LTR"), 16983 @ViewDebug.IntToString(from = TEXT_DIRECTION_RTL, to = "RTL"), 16984 @ViewDebug.IntToString(from = TEXT_DIRECTION_LOCALE, to = "LOCALE") 16985 }) 16986 public int getRawTextDirection() { 16987 return (mPrivateFlags2 & PFLAG2_TEXT_DIRECTION_MASK) >> PFLAG2_TEXT_DIRECTION_MASK_SHIFT; 16988 } 16989 16990 /** 16991 * Set the text direction. 16992 * 16993 * @param textDirection the direction to set. Should be one of: 16994 * 16995 * {@link #TEXT_DIRECTION_INHERIT}, 16996 * {@link #TEXT_DIRECTION_FIRST_STRONG} 16997 * {@link #TEXT_DIRECTION_ANY_RTL}, 16998 * {@link #TEXT_DIRECTION_LTR}, 16999 * {@link #TEXT_DIRECTION_RTL}, 17000 * {@link #TEXT_DIRECTION_LOCALE} 17001 * 17002 * Resolution will be done if the value is set to TEXT_DIRECTION_INHERIT. The resolution 17003 * proceeds up the parent chain of the view to get the value. If there is no parent, then it will 17004 * return the default {@link #TEXT_DIRECTION_FIRST_STRONG}. 17005 * 17006 * @attr ref android.R.styleable#View_textDirection 17007 */ 17008 public void setTextDirection(int textDirection) { 17009 if (getRawTextDirection() != textDirection) { 17010 // Reset the current text direction and the resolved one 17011 mPrivateFlags2 &= ~PFLAG2_TEXT_DIRECTION_MASK; 17012 resetResolvedTextDirection(); 17013 // Set the new text direction 17014 mPrivateFlags2 |= ((textDirection << PFLAG2_TEXT_DIRECTION_MASK_SHIFT) & PFLAG2_TEXT_DIRECTION_MASK); 17015 // Do resolution 17016 resolveTextDirection(); 17017 // Notify change 17018 onRtlPropertiesChanged(getLayoutDirection()); 17019 // Refresh 17020 requestLayout(); 17021 invalidate(true); 17022 } 17023 } 17024 17025 /** 17026 * Return the resolved text direction. 17027 * 17028 * @return the resolved text direction. Returns one of: 17029 * 17030 * {@link #TEXT_DIRECTION_FIRST_STRONG} 17031 * {@link #TEXT_DIRECTION_ANY_RTL}, 17032 * {@link #TEXT_DIRECTION_LTR}, 17033 * {@link #TEXT_DIRECTION_RTL}, 17034 * {@link #TEXT_DIRECTION_LOCALE} 17035 * 17036 * @attr ref android.R.styleable#View_textDirection 17037 */ 17038 @ViewDebug.ExportedProperty(category = "text", mapping = { 17039 @ViewDebug.IntToString(from = TEXT_DIRECTION_INHERIT, to = "INHERIT"), 17040 @ViewDebug.IntToString(from = TEXT_DIRECTION_FIRST_STRONG, to = "FIRST_STRONG"), 17041 @ViewDebug.IntToString(from = TEXT_DIRECTION_ANY_RTL, to = "ANY_RTL"), 17042 @ViewDebug.IntToString(from = TEXT_DIRECTION_LTR, to = "LTR"), 17043 @ViewDebug.IntToString(from = TEXT_DIRECTION_RTL, to = "RTL"), 17044 @ViewDebug.IntToString(from = TEXT_DIRECTION_LOCALE, to = "LOCALE") 17045 }) 17046 public int getTextDirection() { 17047 return (mPrivateFlags2 & PFLAG2_TEXT_DIRECTION_RESOLVED_MASK) >> PFLAG2_TEXT_DIRECTION_RESOLVED_MASK_SHIFT; 17048 } 17049 17050 /** 17051 * Resolve the text direction. 17052 * 17053 * @return true if resolution has been done, false otherwise. 17054 * 17055 * @hide 17056 */ 17057 public boolean resolveTextDirection() { 17058 // Reset any previous text direction resolution 17059 mPrivateFlags2 &= ~(PFLAG2_TEXT_DIRECTION_RESOLVED | PFLAG2_TEXT_DIRECTION_RESOLVED_MASK); 17060 17061 if (hasRtlSupport()) { 17062 // Set resolved text direction flag depending on text direction flag 17063 final int textDirection = getRawTextDirection(); 17064 switch(textDirection) { 17065 case TEXT_DIRECTION_INHERIT: 17066 if (!canResolveTextDirection()) { 17067 // We cannot do the resolution if there is no parent, so use the default one 17068 mPrivateFlags2 |= PFLAG2_TEXT_DIRECTION_RESOLVED_DEFAULT; 17069 // Resolution will need to happen again later 17070 return false; 17071 } 17072 17073 // Parent has not yet resolved, so we still return the default 17074 if (!mParent.isTextDirectionResolved()) { 17075 mPrivateFlags2 |= PFLAG2_TEXT_DIRECTION_RESOLVED_DEFAULT; 17076 // Resolution will need to happen again later 17077 return false; 17078 } 17079 17080 // Set current resolved direction to the same value as the parent's one 17081 final int parentResolvedDirection = mParent.getTextDirection(); 17082 switch (parentResolvedDirection) { 17083 case TEXT_DIRECTION_FIRST_STRONG: 17084 case TEXT_DIRECTION_ANY_RTL: 17085 case TEXT_DIRECTION_LTR: 17086 case TEXT_DIRECTION_RTL: 17087 case TEXT_DIRECTION_LOCALE: 17088 mPrivateFlags2 |= 17089 (parentResolvedDirection << PFLAG2_TEXT_DIRECTION_RESOLVED_MASK_SHIFT); 17090 break; 17091 default: 17092 // Default resolved direction is "first strong" heuristic 17093 mPrivateFlags2 |= PFLAG2_TEXT_DIRECTION_RESOLVED_DEFAULT; 17094 } 17095 break; 17096 case TEXT_DIRECTION_FIRST_STRONG: 17097 case TEXT_DIRECTION_ANY_RTL: 17098 case TEXT_DIRECTION_LTR: 17099 case TEXT_DIRECTION_RTL: 17100 case TEXT_DIRECTION_LOCALE: 17101 // Resolved direction is the same as text direction 17102 mPrivateFlags2 |= (textDirection << PFLAG2_TEXT_DIRECTION_RESOLVED_MASK_SHIFT); 17103 break; 17104 default: 17105 // Default resolved direction is "first strong" heuristic 17106 mPrivateFlags2 |= PFLAG2_TEXT_DIRECTION_RESOLVED_DEFAULT; 17107 } 17108 } else { 17109 // Default resolved direction is "first strong" heuristic 17110 mPrivateFlags2 |= PFLAG2_TEXT_DIRECTION_RESOLVED_DEFAULT; 17111 } 17112 17113 // Set to resolved 17114 mPrivateFlags2 |= PFLAG2_TEXT_DIRECTION_RESOLVED; 17115 return true; 17116 } 17117 17118 /** 17119 * Check if text direction resolution can be done. 17120 * 17121 * @return true if text direction resolution can be done otherwise return false. 17122 * 17123 * @hide 17124 */ 17125 public boolean canResolveTextDirection() { 17126 switch (getRawTextDirection()) { 17127 case TEXT_DIRECTION_INHERIT: 17128 return (mParent != null) && mParent.canResolveTextDirection(); 17129 default: 17130 return true; 17131 } 17132 } 17133 17134 /** 17135 * Reset resolved text direction. Text direction will be resolved during a call to 17136 * {@link #onMeasure(int, int)}. 17137 * 17138 * @hide 17139 */ 17140 public void resetResolvedTextDirection() { 17141 // Reset any previous text direction resolution 17142 mPrivateFlags2 &= ~(PFLAG2_TEXT_DIRECTION_RESOLVED | PFLAG2_TEXT_DIRECTION_RESOLVED_MASK); 17143 // Set to default value 17144 mPrivateFlags2 |= PFLAG2_TEXT_DIRECTION_RESOLVED_DEFAULT; 17145 } 17146 17147 /** 17148 * @return true if text direction is inherited. 17149 * 17150 * @hide 17151 */ 17152 public boolean isTextDirectionInherited() { 17153 return (getRawTextDirection() == TEXT_DIRECTION_INHERIT); 17154 } 17155 17156 /** 17157 * @return true if text direction is resolved. 17158 * 17159 * @hide 17160 */ 17161 public boolean isTextDirectionResolved() { 17162 return (mPrivateFlags2 & PFLAG2_TEXT_DIRECTION_RESOLVED) == PFLAG2_TEXT_DIRECTION_RESOLVED; 17163 } 17164 17165 /** 17166 * Return the value specifying the text alignment or policy that was set with 17167 * {@link #setTextAlignment(int)}. 17168 * 17169 * @return the defined text alignment. It can be one of: 17170 * 17171 * {@link #TEXT_ALIGNMENT_INHERIT}, 17172 * {@link #TEXT_ALIGNMENT_GRAVITY}, 17173 * {@link #TEXT_ALIGNMENT_CENTER}, 17174 * {@link #TEXT_ALIGNMENT_TEXT_START}, 17175 * {@link #TEXT_ALIGNMENT_TEXT_END}, 17176 * {@link #TEXT_ALIGNMENT_VIEW_START}, 17177 * {@link #TEXT_ALIGNMENT_VIEW_END} 17178 * 17179 * @attr ref android.R.styleable#View_textAlignment 17180 * 17181 * @hide 17182 */ 17183 @ViewDebug.ExportedProperty(category = "text", mapping = { 17184 @ViewDebug.IntToString(from = TEXT_ALIGNMENT_INHERIT, to = "INHERIT"), 17185 @ViewDebug.IntToString(from = TEXT_ALIGNMENT_GRAVITY, to = "GRAVITY"), 17186 @ViewDebug.IntToString(from = TEXT_ALIGNMENT_TEXT_START, to = "TEXT_START"), 17187 @ViewDebug.IntToString(from = TEXT_ALIGNMENT_TEXT_END, to = "TEXT_END"), 17188 @ViewDebug.IntToString(from = TEXT_ALIGNMENT_CENTER, to = "CENTER"), 17189 @ViewDebug.IntToString(from = TEXT_ALIGNMENT_VIEW_START, to = "VIEW_START"), 17190 @ViewDebug.IntToString(from = TEXT_ALIGNMENT_VIEW_END, to = "VIEW_END") 17191 }) 17192 public int getRawTextAlignment() { 17193 return (mPrivateFlags2 & PFLAG2_TEXT_ALIGNMENT_MASK) >> PFLAG2_TEXT_ALIGNMENT_MASK_SHIFT; 17194 } 17195 17196 /** 17197 * Set the text alignment. 17198 * 17199 * @param textAlignment The text alignment to set. Should be one of 17200 * 17201 * {@link #TEXT_ALIGNMENT_INHERIT}, 17202 * {@link #TEXT_ALIGNMENT_GRAVITY}, 17203 * {@link #TEXT_ALIGNMENT_CENTER}, 17204 * {@link #TEXT_ALIGNMENT_TEXT_START}, 17205 * {@link #TEXT_ALIGNMENT_TEXT_END}, 17206 * {@link #TEXT_ALIGNMENT_VIEW_START}, 17207 * {@link #TEXT_ALIGNMENT_VIEW_END} 17208 * 17209 * Resolution will be done if the value is set to TEXT_ALIGNMENT_INHERIT. The resolution 17210 * proceeds up the parent chain of the view to get the value. If there is no parent, then it 17211 * will return the default {@link #TEXT_ALIGNMENT_GRAVITY}. 17212 * 17213 * @attr ref android.R.styleable#View_textAlignment 17214 */ 17215 public void setTextAlignment(int textAlignment) { 17216 if (textAlignment != getRawTextAlignment()) { 17217 // Reset the current and resolved text alignment 17218 mPrivateFlags2 &= ~PFLAG2_TEXT_ALIGNMENT_MASK; 17219 resetResolvedTextAlignment(); 17220 // Set the new text alignment 17221 mPrivateFlags2 |= 17222 ((textAlignment << PFLAG2_TEXT_ALIGNMENT_MASK_SHIFT) & PFLAG2_TEXT_ALIGNMENT_MASK); 17223 // Do resolution 17224 resolveTextAlignment(); 17225 // Notify change 17226 onRtlPropertiesChanged(getLayoutDirection()); 17227 // Refresh 17228 requestLayout(); 17229 invalidate(true); 17230 } 17231 } 17232 17233 /** 17234 * Return the resolved text alignment. 17235 * 17236 * @return the resolved text alignment. Returns one of: 17237 * 17238 * {@link #TEXT_ALIGNMENT_GRAVITY}, 17239 * {@link #TEXT_ALIGNMENT_CENTER}, 17240 * {@link #TEXT_ALIGNMENT_TEXT_START}, 17241 * {@link #TEXT_ALIGNMENT_TEXT_END}, 17242 * {@link #TEXT_ALIGNMENT_VIEW_START}, 17243 * {@link #TEXT_ALIGNMENT_VIEW_END} 17244 * 17245 * @attr ref android.R.styleable#View_textAlignment 17246 */ 17247 @ViewDebug.ExportedProperty(category = "text", mapping = { 17248 @ViewDebug.IntToString(from = TEXT_ALIGNMENT_INHERIT, to = "INHERIT"), 17249 @ViewDebug.IntToString(from = TEXT_ALIGNMENT_GRAVITY, to = "GRAVITY"), 17250 @ViewDebug.IntToString(from = TEXT_ALIGNMENT_TEXT_START, to = "TEXT_START"), 17251 @ViewDebug.IntToString(from = TEXT_ALIGNMENT_TEXT_END, to = "TEXT_END"), 17252 @ViewDebug.IntToString(from = TEXT_ALIGNMENT_CENTER, to = "CENTER"), 17253 @ViewDebug.IntToString(from = TEXT_ALIGNMENT_VIEW_START, to = "VIEW_START"), 17254 @ViewDebug.IntToString(from = TEXT_ALIGNMENT_VIEW_END, to = "VIEW_END") 17255 }) 17256 public int getTextAlignment() { 17257 return (mPrivateFlags2 & PFLAG2_TEXT_ALIGNMENT_RESOLVED_MASK) >> 17258 PFLAG2_TEXT_ALIGNMENT_RESOLVED_MASK_SHIFT; 17259 } 17260 17261 /** 17262 * Resolve the text alignment. 17263 * 17264 * @return true if resolution has been done, false otherwise. 17265 * 17266 * @hide 17267 */ 17268 public boolean resolveTextAlignment() { 17269 // Reset any previous text alignment resolution 17270 mPrivateFlags2 &= ~(PFLAG2_TEXT_ALIGNMENT_RESOLVED | PFLAG2_TEXT_ALIGNMENT_RESOLVED_MASK); 17271 17272 if (hasRtlSupport()) { 17273 // Set resolved text alignment flag depending on text alignment flag 17274 final int textAlignment = getRawTextAlignment(); 17275 switch (textAlignment) { 17276 case TEXT_ALIGNMENT_INHERIT: 17277 // Check if we can resolve the text alignment 17278 if (!canResolveTextAlignment()) { 17279 // We cannot do the resolution if there is no parent so use the default 17280 mPrivateFlags2 |= PFLAG2_TEXT_ALIGNMENT_RESOLVED_DEFAULT; 17281 // Resolution will need to happen again later 17282 return false; 17283 } 17284 17285 // Parent has not yet resolved, so we still return the default 17286 if (!mParent.isTextAlignmentResolved()) { 17287 mPrivateFlags2 |= PFLAG2_TEXT_ALIGNMENT_RESOLVED_DEFAULT; 17288 // Resolution will need to happen again later 17289 return false; 17290 } 17291 17292 final int parentResolvedTextAlignment = mParent.getTextAlignment(); 17293 switch (parentResolvedTextAlignment) { 17294 case TEXT_ALIGNMENT_GRAVITY: 17295 case TEXT_ALIGNMENT_TEXT_START: 17296 case TEXT_ALIGNMENT_TEXT_END: 17297 case TEXT_ALIGNMENT_CENTER: 17298 case TEXT_ALIGNMENT_VIEW_START: 17299 case TEXT_ALIGNMENT_VIEW_END: 17300 // Resolved text alignment is the same as the parent resolved 17301 // text alignment 17302 mPrivateFlags2 |= 17303 (parentResolvedTextAlignment << PFLAG2_TEXT_ALIGNMENT_RESOLVED_MASK_SHIFT); 17304 break; 17305 default: 17306 // Use default resolved text alignment 17307 mPrivateFlags2 |= PFLAG2_TEXT_ALIGNMENT_RESOLVED_DEFAULT; 17308 } 17309 break; 17310 case TEXT_ALIGNMENT_GRAVITY: 17311 case TEXT_ALIGNMENT_TEXT_START: 17312 case TEXT_ALIGNMENT_TEXT_END: 17313 case TEXT_ALIGNMENT_CENTER: 17314 case TEXT_ALIGNMENT_VIEW_START: 17315 case TEXT_ALIGNMENT_VIEW_END: 17316 // Resolved text alignment is the same as text alignment 17317 mPrivateFlags2 |= (textAlignment << PFLAG2_TEXT_ALIGNMENT_RESOLVED_MASK_SHIFT); 17318 break; 17319 default: 17320 // Use default resolved text alignment 17321 mPrivateFlags2 |= PFLAG2_TEXT_ALIGNMENT_RESOLVED_DEFAULT; 17322 } 17323 } else { 17324 // Use default resolved text alignment 17325 mPrivateFlags2 |= PFLAG2_TEXT_ALIGNMENT_RESOLVED_DEFAULT; 17326 } 17327 17328 // Set the resolved 17329 mPrivateFlags2 |= PFLAG2_TEXT_ALIGNMENT_RESOLVED; 17330 return true; 17331 } 17332 17333 /** 17334 * Check if text alignment resolution can be done. 17335 * 17336 * @return true if text alignment resolution can be done otherwise return false. 17337 * 17338 * @hide 17339 */ 17340 public boolean canResolveTextAlignment() { 17341 switch (getRawTextAlignment()) { 17342 case TEXT_DIRECTION_INHERIT: 17343 return (mParent != null) && mParent.canResolveTextAlignment(); 17344 default: 17345 return true; 17346 } 17347 } 17348 17349 /** 17350 * Reset resolved text alignment. Text alignment will be resolved during a call to 17351 * {@link #onMeasure(int, int)}. 17352 * 17353 * @hide 17354 */ 17355 public void resetResolvedTextAlignment() { 17356 // Reset any previous text alignment resolution 17357 mPrivateFlags2 &= ~(PFLAG2_TEXT_ALIGNMENT_RESOLVED | PFLAG2_TEXT_ALIGNMENT_RESOLVED_MASK); 17358 // Set to default 17359 mPrivateFlags2 |= PFLAG2_TEXT_ALIGNMENT_RESOLVED_DEFAULT; 17360 } 17361 17362 /** 17363 * @return true if text alignment is inherited. 17364 * 17365 * @hide 17366 */ 17367 public boolean isTextAlignmentInherited() { 17368 return (getRawTextAlignment() == TEXT_ALIGNMENT_INHERIT); 17369 } 17370 17371 /** 17372 * @return true if text alignment is resolved. 17373 * 17374 * @hide 17375 */ 17376 public boolean isTextAlignmentResolved() { 17377 return (mPrivateFlags2 & PFLAG2_TEXT_ALIGNMENT_RESOLVED) == PFLAG2_TEXT_ALIGNMENT_RESOLVED; 17378 } 17379 17380 /** 17381 * Generate a value suitable for use in {@link #setId(int)}. 17382 * This value will not collide with ID values generated at build time by aapt for R.id. 17383 * 17384 * @return a generated ID value 17385 */ 17386 public static int generateViewId() { 17387 for (;;) { 17388 final int result = sNextGeneratedId.get(); 17389 // aapt-generated IDs have the high byte nonzero; clamp to the range under that. 17390 int newValue = result + 1; 17391 if (newValue > 0x00FFFFFF) newValue = 1; // Roll over to 1, not 0. 17392 if (sNextGeneratedId.compareAndSet(result, newValue)) { 17393 return result; 17394 } 17395 } 17396 } 17397 17398 // 17399 // Properties 17400 // 17401 /** 17402 * A Property wrapper around the <code>alpha</code> functionality handled by the 17403 * {@link View#setAlpha(float)} and {@link View#getAlpha()} methods. 17404 */ 17405 public static final Property<View, Float> ALPHA = new FloatProperty<View>("alpha") { 17406 @Override 17407 public void setValue(View object, float value) { 17408 object.setAlpha(value); 17409 } 17410 17411 @Override 17412 public Float get(View object) { 17413 return object.getAlpha(); 17414 } 17415 }; 17416 17417 /** 17418 * A Property wrapper around the <code>translationX</code> functionality handled by the 17419 * {@link View#setTranslationX(float)} and {@link View#getTranslationX()} methods. 17420 */ 17421 public static final Property<View, Float> TRANSLATION_X = new FloatProperty<View>("translationX") { 17422 @Override 17423 public void setValue(View object, float value) { 17424 object.setTranslationX(value); 17425 } 17426 17427 @Override 17428 public Float get(View object) { 17429 return object.getTranslationX(); 17430 } 17431 }; 17432 17433 /** 17434 * A Property wrapper around the <code>translationY</code> functionality handled by the 17435 * {@link View#setTranslationY(float)} and {@link View#getTranslationY()} methods. 17436 */ 17437 public static final Property<View, Float> TRANSLATION_Y = new FloatProperty<View>("translationY") { 17438 @Override 17439 public void setValue(View object, float value) { 17440 object.setTranslationY(value); 17441 } 17442 17443 @Override 17444 public Float get(View object) { 17445 return object.getTranslationY(); 17446 } 17447 }; 17448 17449 /** 17450 * A Property wrapper around the <code>x</code> functionality handled by the 17451 * {@link View#setX(float)} and {@link View#getX()} methods. 17452 */ 17453 public static final Property<View, Float> X = new FloatProperty<View>("x") { 17454 @Override 17455 public void setValue(View object, float value) { 17456 object.setX(value); 17457 } 17458 17459 @Override 17460 public Float get(View object) { 17461 return object.getX(); 17462 } 17463 }; 17464 17465 /** 17466 * A Property wrapper around the <code>y</code> functionality handled by the 17467 * {@link View#setY(float)} and {@link View#getY()} methods. 17468 */ 17469 public static final Property<View, Float> Y = new FloatProperty<View>("y") { 17470 @Override 17471 public void setValue(View object, float value) { 17472 object.setY(value); 17473 } 17474 17475 @Override 17476 public Float get(View object) { 17477 return object.getY(); 17478 } 17479 }; 17480 17481 /** 17482 * A Property wrapper around the <code>rotation</code> functionality handled by the 17483 * {@link View#setRotation(float)} and {@link View#getRotation()} methods. 17484 */ 17485 public static final Property<View, Float> ROTATION = new FloatProperty<View>("rotation") { 17486 @Override 17487 public void setValue(View object, float value) { 17488 object.setRotation(value); 17489 } 17490 17491 @Override 17492 public Float get(View object) { 17493 return object.getRotation(); 17494 } 17495 }; 17496 17497 /** 17498 * A Property wrapper around the <code>rotationX</code> functionality handled by the 17499 * {@link View#setRotationX(float)} and {@link View#getRotationX()} methods. 17500 */ 17501 public static final Property<View, Float> ROTATION_X = new FloatProperty<View>("rotationX") { 17502 @Override 17503 public void setValue(View object, float value) { 17504 object.setRotationX(value); 17505 } 17506 17507 @Override 17508 public Float get(View object) { 17509 return object.getRotationX(); 17510 } 17511 }; 17512 17513 /** 17514 * A Property wrapper around the <code>rotationY</code> functionality handled by the 17515 * {@link View#setRotationY(float)} and {@link View#getRotationY()} methods. 17516 */ 17517 public static final Property<View, Float> ROTATION_Y = new FloatProperty<View>("rotationY") { 17518 @Override 17519 public void setValue(View object, float value) { 17520 object.setRotationY(value); 17521 } 17522 17523 @Override 17524 public Float get(View object) { 17525 return object.getRotationY(); 17526 } 17527 }; 17528 17529 /** 17530 * A Property wrapper around the <code>scaleX</code> functionality handled by the 17531 * {@link View#setScaleX(float)} and {@link View#getScaleX()} methods. 17532 */ 17533 public static final Property<View, Float> SCALE_X = new FloatProperty<View>("scaleX") { 17534 @Override 17535 public void setValue(View object, float value) { 17536 object.setScaleX(value); 17537 } 17538 17539 @Override 17540 public Float get(View object) { 17541 return object.getScaleX(); 17542 } 17543 }; 17544 17545 /** 17546 * A Property wrapper around the <code>scaleY</code> functionality handled by the 17547 * {@link View#setScaleY(float)} and {@link View#getScaleY()} methods. 17548 */ 17549 public static final Property<View, Float> SCALE_Y = new FloatProperty<View>("scaleY") { 17550 @Override 17551 public void setValue(View object, float value) { 17552 object.setScaleY(value); 17553 } 17554 17555 @Override 17556 public Float get(View object) { 17557 return object.getScaleY(); 17558 } 17559 }; 17560 17561 /** 17562 * A MeasureSpec encapsulates the layout requirements passed from parent to child. 17563 * Each MeasureSpec represents a requirement for either the width or the height. 17564 * A MeasureSpec is comprised of a size and a mode. There are three possible 17565 * modes: 17566 * <dl> 17567 * <dt>UNSPECIFIED</dt> 17568 * <dd> 17569 * The parent has not imposed any constraint on the child. It can be whatever size 17570 * it wants. 17571 * </dd> 17572 * 17573 * <dt>EXACTLY</dt> 17574 * <dd> 17575 * The parent has determined an exact size for the child. The child is going to be 17576 * given those bounds regardless of how big it wants to be. 17577 * </dd> 17578 * 17579 * <dt>AT_MOST</dt> 17580 * <dd> 17581 * The child can be as large as it wants up to the specified size. 17582 * </dd> 17583 * </dl> 17584 * 17585 * MeasureSpecs are implemented as ints to reduce object allocation. This class 17586 * is provided to pack and unpack the <size, mode> tuple into the int. 17587 */ 17588 public static class MeasureSpec { 17589 private static final int MODE_SHIFT = 30; 17590 private static final int MODE_MASK = 0x3 << MODE_SHIFT; 17591 17592 /** 17593 * Measure specification mode: The parent has not imposed any constraint 17594 * on the child. It can be whatever size it wants. 17595 */ 17596 public static final int UNSPECIFIED = 0 << MODE_SHIFT; 17597 17598 /** 17599 * Measure specification mode: The parent has determined an exact size 17600 * for the child. The child is going to be given those bounds regardless 17601 * of how big it wants to be. 17602 */ 17603 public static final int EXACTLY = 1 << MODE_SHIFT; 17604 17605 /** 17606 * Measure specification mode: The child can be as large as it wants up 17607 * to the specified size. 17608 */ 17609 public static final int AT_MOST = 2 << MODE_SHIFT; 17610 17611 /** 17612 * Creates a measure specification based on the supplied size and mode. 17613 * 17614 * The mode must always be one of the following: 17615 * <ul> 17616 * <li>{@link android.view.View.MeasureSpec#UNSPECIFIED}</li> 17617 * <li>{@link android.view.View.MeasureSpec#EXACTLY}</li> 17618 * <li>{@link android.view.View.MeasureSpec#AT_MOST}</li> 17619 * </ul> 17620 * 17621 * <p><strong>Note:</strong> On API level 17 and lower, makeMeasureSpec's 17622 * implementation was such that the order of arguments did not matter 17623 * and overflow in either value could impact the resulting MeasureSpec. 17624 * {@link android.widget.RelativeLayout} was affected by this bug. 17625 * Apps targeting API levels greater than 17 will get the fixed, more strict 17626 * behavior.</p> 17627 * 17628 * @param size the size of the measure specification 17629 * @param mode the mode of the measure specification 17630 * @return the measure specification based on size and mode 17631 */ 17632 public static int makeMeasureSpec(int size, int mode) { 17633 if (sUseBrokenMakeMeasureSpec) { 17634 return size + mode; 17635 } else { 17636 return (size & ~MODE_MASK) | (mode & MODE_MASK); 17637 } 17638 } 17639 17640 /** 17641 * Extracts the mode from the supplied measure specification. 17642 * 17643 * @param measureSpec the measure specification to extract the mode from 17644 * @return {@link android.view.View.MeasureSpec#UNSPECIFIED}, 17645 * {@link android.view.View.MeasureSpec#AT_MOST} or 17646 * {@link android.view.View.MeasureSpec#EXACTLY} 17647 */ 17648 public static int getMode(int measureSpec) { 17649 return (measureSpec & MODE_MASK); 17650 } 17651 17652 /** 17653 * Extracts the size from the supplied measure specification. 17654 * 17655 * @param measureSpec the measure specification to extract the size from 17656 * @return the size in pixels defined in the supplied measure specification 17657 */ 17658 public static int getSize(int measureSpec) { 17659 return (measureSpec & ~MODE_MASK); 17660 } 17661 17662 static int adjust(int measureSpec, int delta) { 17663 return makeMeasureSpec(getSize(measureSpec + delta), getMode(measureSpec)); 17664 } 17665 17666 /** 17667 * Returns a String representation of the specified measure 17668 * specification. 17669 * 17670 * @param measureSpec the measure specification to convert to a String 17671 * @return a String with the following format: "MeasureSpec: MODE SIZE" 17672 */ 17673 public static String toString(int measureSpec) { 17674 int mode = getMode(measureSpec); 17675 int size = getSize(measureSpec); 17676 17677 StringBuilder sb = new StringBuilder("MeasureSpec: "); 17678 17679 if (mode == UNSPECIFIED) 17680 sb.append("UNSPECIFIED "); 17681 else if (mode == EXACTLY) 17682 sb.append("EXACTLY "); 17683 else if (mode == AT_MOST) 17684 sb.append("AT_MOST "); 17685 else 17686 sb.append(mode).append(" "); 17687 17688 sb.append(size); 17689 return sb.toString(); 17690 } 17691 } 17692 17693 class CheckForLongPress implements Runnable { 17694 17695 private int mOriginalWindowAttachCount; 17696 17697 public void run() { 17698 if (isPressed() && (mParent != null) 17699 && mOriginalWindowAttachCount == mWindowAttachCount) { 17700 if (performLongClick()) { 17701 mHasPerformedLongPress = true; 17702 } 17703 } 17704 } 17705 17706 public void rememberWindowAttachCount() { 17707 mOriginalWindowAttachCount = mWindowAttachCount; 17708 } 17709 } 17710 17711 private final class CheckForTap implements Runnable { 17712 public void run() { 17713 mPrivateFlags &= ~PFLAG_PREPRESSED; 17714 setPressed(true); 17715 checkForLongClick(ViewConfiguration.getTapTimeout()); 17716 } 17717 } 17718 17719 private final class PerformClick implements Runnable { 17720 public void run() { 17721 performClick(); 17722 } 17723 } 17724 17725 /** @hide */ 17726 public void hackTurnOffWindowResizeAnim(boolean off) { 17727 mAttachInfo.mTurnOffWindowResizeAnim = off; 17728 } 17729 17730 /** 17731 * This method returns a ViewPropertyAnimator object, which can be used to animate 17732 * specific properties on this View. 17733 * 17734 * @return ViewPropertyAnimator The ViewPropertyAnimator associated with this View. 17735 */ 17736 public ViewPropertyAnimator animate() { 17737 if (mAnimator == null) { 17738 mAnimator = new ViewPropertyAnimator(this); 17739 } 17740 return mAnimator; 17741 } 17742 17743 /** 17744 * Interface definition for a callback to be invoked when a hardware key event is 17745 * dispatched to this view. The callback will be invoked before the key event is 17746 * given to the view. This is only useful for hardware keyboards; a software input 17747 * method has no obligation to trigger this listener. 17748 */ 17749 public interface OnKeyListener { 17750 /** 17751 * Called when a hardware key is dispatched to a view. This allows listeners to 17752 * get a chance to respond before the target view. 17753 * <p>Key presses in software keyboards will generally NOT trigger this method, 17754 * although some may elect to do so in some situations. Do not assume a 17755 * software input method has to be key-based; even if it is, it may use key presses 17756 * in a different way than you expect, so there is no way to reliably catch soft 17757 * input key presses. 17758 * 17759 * @param v The view the key has been dispatched to. 17760 * @param keyCode The code for the physical key that was pressed 17761 * @param event The KeyEvent object containing full information about 17762 * the event. 17763 * @return True if the listener has consumed the event, false otherwise. 17764 */ 17765 boolean onKey(View v, int keyCode, KeyEvent event); 17766 } 17767 17768 /** 17769 * Interface definition for a callback to be invoked when a touch event is 17770 * dispatched to this view. The callback will be invoked before the touch 17771 * event is given to the view. 17772 */ 17773 public interface OnTouchListener { 17774 /** 17775 * Called when a touch event is dispatched to a view. This allows listeners to 17776 * get a chance to respond before the target view. 17777 * 17778 * @param v The view the touch event has been dispatched to. 17779 * @param event The MotionEvent object containing full information about 17780 * the event. 17781 * @return True if the listener has consumed the event, false otherwise. 17782 */ 17783 boolean onTouch(View v, MotionEvent event); 17784 } 17785 17786 /** 17787 * Interface definition for a callback to be invoked when a hover event is 17788 * dispatched to this view. The callback will be invoked before the hover 17789 * event is given to the view. 17790 */ 17791 public interface OnHoverListener { 17792 /** 17793 * Called when a hover event is dispatched to a view. This allows listeners to 17794 * get a chance to respond before the target view. 17795 * 17796 * @param v The view the hover event has been dispatched to. 17797 * @param event The MotionEvent object containing full information about 17798 * the event. 17799 * @return True if the listener has consumed the event, false otherwise. 17800 */ 17801 boolean onHover(View v, MotionEvent event); 17802 } 17803 17804 /** 17805 * Interface definition for a callback to be invoked when a generic motion event is 17806 * dispatched to this view. The callback will be invoked before the generic motion 17807 * event is given to the view. 17808 */ 17809 public interface OnGenericMotionListener { 17810 /** 17811 * Called when a generic motion event is dispatched to a view. This allows listeners to 17812 * get a chance to respond before the target view. 17813 * 17814 * @param v The view the generic motion event has been dispatched to. 17815 * @param event The MotionEvent object containing full information about 17816 * the event. 17817 * @return True if the listener has consumed the event, false otherwise. 17818 */ 17819 boolean onGenericMotion(View v, MotionEvent event); 17820 } 17821 17822 /** 17823 * Interface definition for a callback to be invoked when a view has been clicked and held. 17824 */ 17825 public interface OnLongClickListener { 17826 /** 17827 * Called when a view has been clicked and held. 17828 * 17829 * @param v The view that was clicked and held. 17830 * 17831 * @return true if the callback consumed the long click, false otherwise. 17832 */ 17833 boolean onLongClick(View v); 17834 } 17835 17836 /** 17837 * Interface definition for a callback to be invoked when a drag is being dispatched 17838 * to this view. The callback will be invoked before the hosting view's own 17839 * onDrag(event) method. If the listener wants to fall back to the hosting view's 17840 * onDrag(event) behavior, it should return 'false' from this callback. 17841 * 17842 * <div class="special reference"> 17843 * <h3>Developer Guides</h3> 17844 * <p>For a guide to implementing drag and drop features, read the 17845 * <a href="{@docRoot}guide/topics/ui/drag-drop.html">Drag and Drop</a> developer guide.</p> 17846 * </div> 17847 */ 17848 public interface OnDragListener { 17849 /** 17850 * Called when a drag event is dispatched to a view. This allows listeners 17851 * to get a chance to override base View behavior. 17852 * 17853 * @param v The View that received the drag event. 17854 * @param event The {@link android.view.DragEvent} object for the drag event. 17855 * @return {@code true} if the drag event was handled successfully, or {@code false} 17856 * if the drag event was not handled. Note that {@code false} will trigger the View 17857 * to call its {@link #onDragEvent(DragEvent) onDragEvent()} handler. 17858 */ 17859 boolean onDrag(View v, DragEvent event); 17860 } 17861 17862 /** 17863 * Interface definition for a callback to be invoked when the focus state of 17864 * a view changed. 17865 */ 17866 public interface OnFocusChangeListener { 17867 /** 17868 * Called when the focus state of a view has changed. 17869 * 17870 * @param v The view whose state has changed. 17871 * @param hasFocus The new focus state of v. 17872 */ 17873 void onFocusChange(View v, boolean hasFocus); 17874 } 17875 17876 /** 17877 * Interface definition for a callback to be invoked when a view is clicked. 17878 */ 17879 public interface OnClickListener { 17880 /** 17881 * Called when a view has been clicked. 17882 * 17883 * @param v The view that was clicked. 17884 */ 17885 void onClick(View v); 17886 } 17887 17888 /** 17889 * Interface definition for a callback to be invoked when the context menu 17890 * for this view is being built. 17891 */ 17892 public interface OnCreateContextMenuListener { 17893 /** 17894 * Called when the context menu for this view is being built. It is not 17895 * safe to hold onto the menu after this method returns. 17896 * 17897 * @param menu The context menu that is being built 17898 * @param v The view for which the context menu is being built 17899 * @param menuInfo Extra information about the item for which the 17900 * context menu should be shown. This information will vary 17901 * depending on the class of v. 17902 */ 17903 void onCreateContextMenu(ContextMenu menu, View v, ContextMenuInfo menuInfo); 17904 } 17905 17906 /** 17907 * Interface definition for a callback to be invoked when the status bar changes 17908 * visibility. This reports <strong>global</strong> changes to the system UI 17909 * state, not what the application is requesting. 17910 * 17911 * @see View#setOnSystemUiVisibilityChangeListener(android.view.View.OnSystemUiVisibilityChangeListener) 17912 */ 17913 public interface OnSystemUiVisibilityChangeListener { 17914 /** 17915 * Called when the status bar changes visibility because of a call to 17916 * {@link View#setSystemUiVisibility(int)}. 17917 * 17918 * @param visibility Bitwise-or of flags {@link #SYSTEM_UI_FLAG_LOW_PROFILE}, 17919 * {@link #SYSTEM_UI_FLAG_HIDE_NAVIGATION}, and {@link #SYSTEM_UI_FLAG_FULLSCREEN}. 17920 * This tells you the <strong>global</strong> state of these UI visibility 17921 * flags, not what your app is currently applying. 17922 */ 17923 public void onSystemUiVisibilityChange(int visibility); 17924 } 17925 17926 /** 17927 * Interface definition for a callback to be invoked when this view is attached 17928 * or detached from its window. 17929 */ 17930 public interface OnAttachStateChangeListener { 17931 /** 17932 * Called when the view is attached to a window. 17933 * @param v The view that was attached 17934 */ 17935 public void onViewAttachedToWindow(View v); 17936 /** 17937 * Called when the view is detached from a window. 17938 * @param v The view that was detached 17939 */ 17940 public void onViewDetachedFromWindow(View v); 17941 } 17942 17943 private final class UnsetPressedState implements Runnable { 17944 public void run() { 17945 setPressed(false); 17946 } 17947 } 17948 17949 /** 17950 * Base class for derived classes that want to save and restore their own 17951 * state in {@link android.view.View#onSaveInstanceState()}. 17952 */ 17953 public static class BaseSavedState extends AbsSavedState { 17954 /** 17955 * Constructor used when reading from a parcel. Reads the state of the superclass. 17956 * 17957 * @param source 17958 */ 17959 public BaseSavedState(Parcel source) { 17960 super(source); 17961 } 17962 17963 /** 17964 * Constructor called by derived classes when creating their SavedState objects 17965 * 17966 * @param superState The state of the superclass of this view 17967 */ 17968 public BaseSavedState(Parcelable superState) { 17969 super(superState); 17970 } 17971 17972 public static final Parcelable.Creator<BaseSavedState> CREATOR = 17973 new Parcelable.Creator<BaseSavedState>() { 17974 public BaseSavedState createFromParcel(Parcel in) { 17975 return new BaseSavedState(in); 17976 } 17977 17978 public BaseSavedState[] newArray(int size) { 17979 return new BaseSavedState[size]; 17980 } 17981 }; 17982 } 17983 17984 /** 17985 * A set of information given to a view when it is attached to its parent 17986 * window. 17987 */ 17988 static class AttachInfo { 17989 interface Callbacks { 17990 void playSoundEffect(int effectId); 17991 boolean performHapticFeedback(int effectId, boolean always); 17992 } 17993 17994 /** 17995 * InvalidateInfo is used to post invalidate(int, int, int, int) messages 17996 * to a Handler. This class contains the target (View) to invalidate and 17997 * the coordinates of the dirty rectangle. 17998 * 17999 * For performance purposes, this class also implements a pool of up to 18000 * POOL_LIMIT objects that get reused. This reduces memory allocations 18001 * whenever possible. 18002 */ 18003 static class InvalidateInfo { 18004 private static final int POOL_LIMIT = 10; 18005 18006 private static final SynchronizedPool<InvalidateInfo> sPool = 18007 new SynchronizedPool<InvalidateInfo>(POOL_LIMIT); 18008 18009 View target; 18010 18011 int left; 18012 int top; 18013 int right; 18014 int bottom; 18015 18016 public static InvalidateInfo obtain() { 18017 InvalidateInfo instance = sPool.acquire(); 18018 return (instance != null) ? instance : new InvalidateInfo(); 18019 } 18020 18021 public void recycle() { 18022 target = null; 18023 sPool.release(this); 18024 } 18025 } 18026 18027 final IWindowSession mSession; 18028 18029 final IWindow mWindow; 18030 18031 final IBinder mWindowToken; 18032 18033 final Display mDisplay; 18034 18035 final Callbacks mRootCallbacks; 18036 18037 HardwareCanvas mHardwareCanvas; 18038 18039 IWindowId mIWindowId; 18040 WindowId mWindowId; 18041 18042 /** 18043 * The top view of the hierarchy. 18044 */ 18045 View mRootView; 18046 18047 IBinder mPanelParentWindowToken; 18048 Surface mSurface; 18049 18050 boolean mHardwareAccelerated; 18051 boolean mHardwareAccelerationRequested; 18052 HardwareRenderer mHardwareRenderer; 18053 18054 boolean mScreenOn; 18055 18056 /** 18057 * Scale factor used by the compatibility mode 18058 */ 18059 float mApplicationScale; 18060 18061 /** 18062 * Indicates whether the application is in compatibility mode 18063 */ 18064 boolean mScalingRequired; 18065 18066 /** 18067 * If set, ViewRootImpl doesn't use its lame animation for when the window resizes. 18068 */ 18069 boolean mTurnOffWindowResizeAnim; 18070 18071 /** 18072 * Left position of this view's window 18073 */ 18074 int mWindowLeft; 18075 18076 /** 18077 * Top position of this view's window 18078 */ 18079 int mWindowTop; 18080 18081 /** 18082 * Indicates whether views need to use 32-bit drawing caches 18083 */ 18084 boolean mUse32BitDrawingCache; 18085 18086 /** 18087 * For windows that are full-screen but using insets to layout inside 18088 * of the screen areas, these are the current insets to appear inside 18089 * the overscan area of the display. 18090 */ 18091 final Rect mOverscanInsets = new Rect(); 18092 18093 /** 18094 * For windows that are full-screen but using insets to layout inside 18095 * of the screen decorations, these are the current insets for the 18096 * content of the window. 18097 */ 18098 final Rect mContentInsets = new Rect(); 18099 18100 /** 18101 * For windows that are full-screen but using insets to layout inside 18102 * of the screen decorations, these are the current insets for the 18103 * actual visible parts of the window. 18104 */ 18105 final Rect mVisibleInsets = new Rect(); 18106 18107 /** 18108 * The internal insets given by this window. This value is 18109 * supplied by the client (through 18110 * {@link ViewTreeObserver.OnComputeInternalInsetsListener}) and will 18111 * be given to the window manager when changed to be used in laying 18112 * out windows behind it. 18113 */ 18114 final ViewTreeObserver.InternalInsetsInfo mGivenInternalInsets 18115 = new ViewTreeObserver.InternalInsetsInfo(); 18116 18117 /** 18118 * All views in the window's hierarchy that serve as scroll containers, 18119 * used to determine if the window can be resized or must be panned 18120 * to adjust for a soft input area. 18121 */ 18122 final ArrayList<View> mScrollContainers = new ArrayList<View>(); 18123 18124 final KeyEvent.DispatcherState mKeyDispatchState 18125 = new KeyEvent.DispatcherState(); 18126 18127 /** 18128 * Indicates whether the view's window currently has the focus. 18129 */ 18130 boolean mHasWindowFocus; 18131 18132 /** 18133 * The current visibility of the window. 18134 */ 18135 int mWindowVisibility; 18136 18137 /** 18138 * Indicates the time at which drawing started to occur. 18139 */ 18140 long mDrawingTime; 18141 18142 /** 18143 * Indicates whether or not ignoring the DIRTY_MASK flags. 18144 */ 18145 boolean mIgnoreDirtyState; 18146 18147 /** 18148 * This flag tracks when the mIgnoreDirtyState flag is set during draw(), 18149 * to avoid clearing that flag prematurely. 18150 */ 18151 boolean mSetIgnoreDirtyState = false; 18152 18153 /** 18154 * Indicates whether the view's window is currently in touch mode. 18155 */ 18156 boolean mInTouchMode; 18157 18158 /** 18159 * Indicates that ViewAncestor should trigger a global layout change 18160 * the next time it performs a traversal 18161 */ 18162 boolean mRecomputeGlobalAttributes; 18163 18164 /** 18165 * Always report new attributes at next traversal. 18166 */ 18167 boolean mForceReportNewAttributes; 18168 18169 /** 18170 * Set during a traveral if any views want to keep the screen on. 18171 */ 18172 boolean mKeepScreenOn; 18173 18174 /** 18175 * Bitwise-or of all of the values that views have passed to setSystemUiVisibility(). 18176 */ 18177 int mSystemUiVisibility; 18178 18179 /** 18180 * Hack to force certain system UI visibility flags to be cleared. 18181 */ 18182 int mDisabledSystemUiVisibility; 18183 18184 /** 18185 * Last global system UI visibility reported by the window manager. 18186 */ 18187 int mGlobalSystemUiVisibility; 18188 18189 /** 18190 * True if a view in this hierarchy has an OnSystemUiVisibilityChangeListener 18191 * attached. 18192 */ 18193 boolean mHasSystemUiListeners; 18194 18195 /** 18196 * Set if the window has requested to extend into the overscan region 18197 * via WindowManager.LayoutParams.FLAG_LAYOUT_IN_OVERSCAN. 18198 */ 18199 boolean mOverscanRequested; 18200 18201 /** 18202 * Set if the visibility of any views has changed. 18203 */ 18204 boolean mViewVisibilityChanged; 18205 18206 /** 18207 * Set to true if a view has been scrolled. 18208 */ 18209 boolean mViewScrollChanged; 18210 18211 /** 18212 * Global to the view hierarchy used as a temporary for dealing with 18213 * x/y points in the transparent region computations. 18214 */ 18215 final int[] mTransparentLocation = new int[2]; 18216 18217 /** 18218 * Global to the view hierarchy used as a temporary for dealing with 18219 * x/y points in the ViewGroup.invalidateChild implementation. 18220 */ 18221 final int[] mInvalidateChildLocation = new int[2]; 18222 18223 18224 /** 18225 * Global to the view hierarchy used as a temporary for dealing with 18226 * x/y location when view is transformed. 18227 */ 18228 final float[] mTmpTransformLocation = new float[2]; 18229 18230 /** 18231 * The view tree observer used to dispatch global events like 18232 * layout, pre-draw, touch mode change, etc. 18233 */ 18234 final ViewTreeObserver mTreeObserver = new ViewTreeObserver(); 18235 18236 /** 18237 * A Canvas used by the view hierarchy to perform bitmap caching. 18238 */ 18239 Canvas mCanvas; 18240 18241 /** 18242 * The view root impl. 18243 */ 18244 final ViewRootImpl mViewRootImpl; 18245 18246 /** 18247 * A Handler supplied by a view's {@link android.view.ViewRootImpl}. This 18248 * handler can be used to pump events in the UI events queue. 18249 */ 18250 final Handler mHandler; 18251 18252 /** 18253 * Temporary for use in computing invalidate rectangles while 18254 * calling up the hierarchy. 18255 */ 18256 final Rect mTmpInvalRect = new Rect(); 18257 18258 /** 18259 * Temporary for use in computing hit areas with transformed views 18260 */ 18261 final RectF mTmpTransformRect = new RectF(); 18262 18263 /** 18264 * Temporary for use in transforming invalidation rect 18265 */ 18266 final Matrix mTmpMatrix = new Matrix(); 18267 18268 /** 18269 * Temporary for use in transforming invalidation rect 18270 */ 18271 final Transformation mTmpTransformation = new Transformation(); 18272 18273 /** 18274 * Temporary list for use in collecting focusable descendents of a view. 18275 */ 18276 final ArrayList<View> mTempArrayList = new ArrayList<View>(24); 18277 18278 /** 18279 * The id of the window for accessibility purposes. 18280 */ 18281 int mAccessibilityWindowId = View.NO_ID; 18282 18283 /** 18284 * Flags related to accessibility processing. 18285 * 18286 * @see AccessibilityNodeInfo#FLAG_INCLUDE_NOT_IMPORTANT_VIEWS 18287 * @see AccessibilityNodeInfo#FLAG_REPORT_VIEW_IDS 18288 */ 18289 int mAccessibilityFetchFlags; 18290 18291 /** 18292 * The drawable for highlighting accessibility focus. 18293 */ 18294 Drawable mAccessibilityFocusDrawable; 18295 18296 /** 18297 * Show where the margins, bounds and layout bounds are for each view. 18298 */ 18299 boolean mDebugLayout = SystemProperties.getBoolean(DEBUG_LAYOUT_PROPERTY, false); 18300 18301 /** 18302 * Point used to compute visible regions. 18303 */ 18304 final Point mPoint = new Point(); 18305 18306 /** 18307 * Used to track which View originated a requestLayout() call, used when 18308 * requestLayout() is called during layout. 18309 */ 18310 View mViewRequestingLayout; 18311 18312 /** 18313 * Creates a new set of attachment information with the specified 18314 * events handler and thread. 18315 * 18316 * @param handler the events handler the view must use 18317 */ 18318 AttachInfo(IWindowSession session, IWindow window, Display display, 18319 ViewRootImpl viewRootImpl, Handler handler, Callbacks effectPlayer) { 18320 mSession = session; 18321 mWindow = window; 18322 mWindowToken = window.asBinder(); 18323 mDisplay = display; 18324 mViewRootImpl = viewRootImpl; 18325 mHandler = handler; 18326 mRootCallbacks = effectPlayer; 18327 } 18328 } 18329 18330 /** 18331 * <p>ScrollabilityCache holds various fields used by a View when scrolling 18332 * is supported. This avoids keeping too many unused fields in most 18333 * instances of View.</p> 18334 */ 18335 private static class ScrollabilityCache implements Runnable { 18336 18337 /** 18338 * Scrollbars are not visible 18339 */ 18340 public static final int OFF = 0; 18341 18342 /** 18343 * Scrollbars are visible 18344 */ 18345 public static final int ON = 1; 18346 18347 /** 18348 * Scrollbars are fading away 18349 */ 18350 public static final int FADING = 2; 18351 18352 public boolean fadeScrollBars; 18353 18354 public int fadingEdgeLength; 18355 public int scrollBarDefaultDelayBeforeFade; 18356 public int scrollBarFadeDuration; 18357 18358 public int scrollBarSize; 18359 public ScrollBarDrawable scrollBar; 18360 public float[] interpolatorValues; 18361 public View host; 18362 18363 public final Paint paint; 18364 public final Matrix matrix; 18365 public Shader shader; 18366 18367 public final Interpolator scrollBarInterpolator = new Interpolator(1, 2); 18368 18369 private static final float[] OPAQUE = { 255 }; 18370 private static final float[] TRANSPARENT = { 0.0f }; 18371 18372 /** 18373 * When fading should start. This time moves into the future every time 18374 * a new scroll happens. Measured based on SystemClock.uptimeMillis() 18375 */ 18376 public long fadeStartTime; 18377 18378 18379 /** 18380 * The current state of the scrollbars: ON, OFF, or FADING 18381 */ 18382 public int state = OFF; 18383 18384 private int mLastColor; 18385 18386 public ScrollabilityCache(ViewConfiguration configuration, View host) { 18387 fadingEdgeLength = configuration.getScaledFadingEdgeLength(); 18388 scrollBarSize = configuration.getScaledScrollBarSize(); 18389 scrollBarDefaultDelayBeforeFade = ViewConfiguration.getScrollDefaultDelay(); 18390 scrollBarFadeDuration = ViewConfiguration.getScrollBarFadeDuration(); 18391 18392 paint = new Paint(); 18393 matrix = new Matrix(); 18394 // use use a height of 1, and then wack the matrix each time we 18395 // actually use it. 18396 shader = new LinearGradient(0, 0, 0, 1, 0xFF000000, 0, Shader.TileMode.CLAMP); 18397 paint.setShader(shader); 18398 paint.setXfermode(new PorterDuffXfermode(PorterDuff.Mode.DST_OUT)); 18399 18400 this.host = host; 18401 } 18402 18403 public void setFadeColor(int color) { 18404 if (color != mLastColor) { 18405 mLastColor = color; 18406 18407 if (color != 0) { 18408 shader = new LinearGradient(0, 0, 0, 1, color | 0xFF000000, 18409 color & 0x00FFFFFF, Shader.TileMode.CLAMP); 18410 paint.setShader(shader); 18411 // Restore the default transfer mode (src_over) 18412 paint.setXfermode(null); 18413 } else { 18414 shader = new LinearGradient(0, 0, 0, 1, 0xFF000000, 0, Shader.TileMode.CLAMP); 18415 paint.setShader(shader); 18416 paint.setXfermode(new PorterDuffXfermode(PorterDuff.Mode.DST_OUT)); 18417 } 18418 } 18419 } 18420 18421 public void run() { 18422 long now = AnimationUtils.currentAnimationTimeMillis(); 18423 if (now >= fadeStartTime) { 18424 18425 // the animation fades the scrollbars out by changing 18426 // the opacity (alpha) from fully opaque to fully 18427 // transparent 18428 int nextFrame = (int) now; 18429 int framesCount = 0; 18430 18431 Interpolator interpolator = scrollBarInterpolator; 18432 18433 // Start opaque 18434 interpolator.setKeyFrame(framesCount++, nextFrame, OPAQUE); 18435 18436 // End transparent 18437 nextFrame += scrollBarFadeDuration; 18438 interpolator.setKeyFrame(framesCount, nextFrame, TRANSPARENT); 18439 18440 state = FADING; 18441 18442 // Kick off the fade animation 18443 host.invalidate(true); 18444 } 18445 } 18446 } 18447 18448 /** 18449 * Resuable callback for sending 18450 * {@link AccessibilityEvent#TYPE_VIEW_SCROLLED} accessibility event. 18451 */ 18452 private class SendViewScrolledAccessibilityEvent implements Runnable { 18453 public volatile boolean mIsPending; 18454 18455 public void run() { 18456 sendAccessibilityEvent(AccessibilityEvent.TYPE_VIEW_SCROLLED); 18457 mIsPending = false; 18458 } 18459 } 18460 18461 /** 18462 * <p> 18463 * This class represents a delegate that can be registered in a {@link View} 18464 * to enhance accessibility support via composition rather via inheritance. 18465 * It is specifically targeted to widget developers that extend basic View 18466 * classes i.e. classes in package android.view, that would like their 18467 * applications to be backwards compatible. 18468 * </p> 18469 * <div class="special reference"> 18470 * <h3>Developer Guides</h3> 18471 * <p>For more information about making applications accessible, read the 18472 * <a href="{@docRoot}guide/topics/ui/accessibility/index.html">Accessibility</a> 18473 * developer guide.</p> 18474 * </div> 18475 * <p> 18476 * A scenario in which a developer would like to use an accessibility delegate 18477 * is overriding a method introduced in a later API version then the minimal API 18478 * version supported by the application. For example, the method 18479 * {@link View#onInitializeAccessibilityNodeInfo(AccessibilityNodeInfo)} is not available 18480 * in API version 4 when the accessibility APIs were first introduced. If a 18481 * developer would like his application to run on API version 4 devices (assuming 18482 * all other APIs used by the application are version 4 or lower) and take advantage 18483 * of this method, instead of overriding the method which would break the application's 18484 * backwards compatibility, he can override the corresponding method in this 18485 * delegate and register the delegate in the target View if the API version of 18486 * the system is high enough i.e. the API version is same or higher to the API 18487 * version that introduced 18488 * {@link View#onInitializeAccessibilityNodeInfo(AccessibilityNodeInfo)}. 18489 * </p> 18490 * <p> 18491 * Here is an example implementation: 18492 * </p> 18493 * <code><pre><p> 18494 * if (Build.VERSION.SDK_INT >= 14) { 18495 * // If the API version is equal of higher than the version in 18496 * // which onInitializeAccessibilityNodeInfo was introduced we 18497 * // register a delegate with a customized implementation. 18498 * View view = findViewById(R.id.view_id); 18499 * view.setAccessibilityDelegate(new AccessibilityDelegate() { 18500 * public void onInitializeAccessibilityNodeInfo(View host, 18501 * AccessibilityNodeInfo info) { 18502 * // Let the default implementation populate the info. 18503 * super.onInitializeAccessibilityNodeInfo(host, info); 18504 * // Set some other information. 18505 * info.setEnabled(host.isEnabled()); 18506 * } 18507 * }); 18508 * } 18509 * </code></pre></p> 18510 * <p> 18511 * This delegate contains methods that correspond to the accessibility methods 18512 * in View. If a delegate has been specified the implementation in View hands 18513 * off handling to the corresponding method in this delegate. The default 18514 * implementation the delegate methods behaves exactly as the corresponding 18515 * method in View for the case of no accessibility delegate been set. Hence, 18516 * to customize the behavior of a View method, clients can override only the 18517 * corresponding delegate method without altering the behavior of the rest 18518 * accessibility related methods of the host view. 18519 * </p> 18520 */ 18521 public static class AccessibilityDelegate { 18522 18523 /** 18524 * Sends an accessibility event of the given type. If accessibility is not 18525 * enabled this method has no effect. 18526 * <p> 18527 * The default implementation behaves as {@link View#sendAccessibilityEvent(int) 18528 * View#sendAccessibilityEvent(int)} for the case of no accessibility delegate 18529 * been set. 18530 * </p> 18531 * 18532 * @param host The View hosting the delegate. 18533 * @param eventType The type of the event to send. 18534 * 18535 * @see View#sendAccessibilityEvent(int) View#sendAccessibilityEvent(int) 18536 */ 18537 public void sendAccessibilityEvent(View host, int eventType) { 18538 host.sendAccessibilityEventInternal(eventType); 18539 } 18540 18541 /** 18542 * Performs the specified accessibility action on the view. For 18543 * possible accessibility actions look at {@link AccessibilityNodeInfo}. 18544 * <p> 18545 * The default implementation behaves as 18546 * {@link View#performAccessibilityAction(int, Bundle) 18547 * View#performAccessibilityAction(int, Bundle)} for the case of 18548 * no accessibility delegate been set. 18549 * </p> 18550 * 18551 * @param action The action to perform. 18552 * @return Whether the action was performed. 18553 * 18554 * @see View#performAccessibilityAction(int, Bundle) 18555 * View#performAccessibilityAction(int, Bundle) 18556 */ 18557 public boolean performAccessibilityAction(View host, int action, Bundle args) { 18558 return host.performAccessibilityActionInternal(action, args); 18559 } 18560 18561 /** 18562 * Sends an accessibility event. This method behaves exactly as 18563 * {@link #sendAccessibilityEvent(View, int)} but takes as an argument an 18564 * empty {@link AccessibilityEvent} and does not perform a check whether 18565 * accessibility is enabled. 18566 * <p> 18567 * The default implementation behaves as 18568 * {@link View#sendAccessibilityEventUnchecked(AccessibilityEvent) 18569 * View#sendAccessibilityEventUnchecked(AccessibilityEvent)} for 18570 * the case of no accessibility delegate been set. 18571 * </p> 18572 * 18573 * @param host The View hosting the delegate. 18574 * @param event The event to send. 18575 * 18576 * @see View#sendAccessibilityEventUnchecked(AccessibilityEvent) 18577 * View#sendAccessibilityEventUnchecked(AccessibilityEvent) 18578 */ 18579 public void sendAccessibilityEventUnchecked(View host, AccessibilityEvent event) { 18580 host.sendAccessibilityEventUncheckedInternal(event); 18581 } 18582 18583 /** 18584 * Dispatches an {@link AccessibilityEvent} to the host {@link View} first and then 18585 * to its children for adding their text content to the event. 18586 * <p> 18587 * The default implementation behaves as 18588 * {@link View#dispatchPopulateAccessibilityEvent(AccessibilityEvent) 18589 * View#dispatchPopulateAccessibilityEvent(AccessibilityEvent)} for 18590 * the case of no accessibility delegate been set. 18591 * </p> 18592 * 18593 * @param host The View hosting the delegate. 18594 * @param event The event. 18595 * @return True if the event population was completed. 18596 * 18597 * @see View#dispatchPopulateAccessibilityEvent(AccessibilityEvent) 18598 * View#dispatchPopulateAccessibilityEvent(AccessibilityEvent) 18599 */ 18600 public boolean dispatchPopulateAccessibilityEvent(View host, AccessibilityEvent event) { 18601 return host.dispatchPopulateAccessibilityEventInternal(event); 18602 } 18603 18604 /** 18605 * Gives a chance to the host View to populate the accessibility event with its 18606 * text content. 18607 * <p> 18608 * The default implementation behaves as 18609 * {@link View#onPopulateAccessibilityEvent(AccessibilityEvent) 18610 * View#onPopulateAccessibilityEvent(AccessibilityEvent)} for 18611 * the case of no accessibility delegate been set. 18612 * </p> 18613 * 18614 * @param host The View hosting the delegate. 18615 * @param event The accessibility event which to populate. 18616 * 18617 * @see View#onPopulateAccessibilityEvent(AccessibilityEvent) 18618 * View#onPopulateAccessibilityEvent(AccessibilityEvent) 18619 */ 18620 public void onPopulateAccessibilityEvent(View host, AccessibilityEvent event) { 18621 host.onPopulateAccessibilityEventInternal(event); 18622 } 18623 18624 /** 18625 * Initializes an {@link AccessibilityEvent} with information about the 18626 * the host View which is the event source. 18627 * <p> 18628 * The default implementation behaves as 18629 * {@link View#onInitializeAccessibilityEvent(AccessibilityEvent) 18630 * View#onInitializeAccessibilityEvent(AccessibilityEvent)} for 18631 * the case of no accessibility delegate been set. 18632 * </p> 18633 * 18634 * @param host The View hosting the delegate. 18635 * @param event The event to initialize. 18636 * 18637 * @see View#onInitializeAccessibilityEvent(AccessibilityEvent) 18638 * View#onInitializeAccessibilityEvent(AccessibilityEvent) 18639 */ 18640 public void onInitializeAccessibilityEvent(View host, AccessibilityEvent event) { 18641 host.onInitializeAccessibilityEventInternal(event); 18642 } 18643 18644 /** 18645 * Initializes an {@link AccessibilityNodeInfo} with information about the host view. 18646 * <p> 18647 * The default implementation behaves as 18648 * {@link View#onInitializeAccessibilityNodeInfo(AccessibilityNodeInfo) 18649 * View#onInitializeAccessibilityNodeInfo(AccessibilityNodeInfo)} for 18650 * the case of no accessibility delegate been set. 18651 * </p> 18652 * 18653 * @param host The View hosting the delegate. 18654 * @param info The instance to initialize. 18655 * 18656 * @see View#onInitializeAccessibilityNodeInfo(AccessibilityNodeInfo) 18657 * View#onInitializeAccessibilityNodeInfo(AccessibilityNodeInfo) 18658 */ 18659 public void onInitializeAccessibilityNodeInfo(View host, AccessibilityNodeInfo info) { 18660 host.onInitializeAccessibilityNodeInfoInternal(info); 18661 } 18662 18663 /** 18664 * Called when a child of the host View has requested sending an 18665 * {@link AccessibilityEvent} and gives an opportunity to the parent (the host) 18666 * to augment the event. 18667 * <p> 18668 * The default implementation behaves as 18669 * {@link ViewGroup#onRequestSendAccessibilityEvent(View, AccessibilityEvent) 18670 * ViewGroup#onRequestSendAccessibilityEvent(View, AccessibilityEvent)} for 18671 * the case of no accessibility delegate been set. 18672 * </p> 18673 * 18674 * @param host The View hosting the delegate. 18675 * @param child The child which requests sending the event. 18676 * @param event The event to be sent. 18677 * @return True if the event should be sent 18678 * 18679 * @see ViewGroup#onRequestSendAccessibilityEvent(View, AccessibilityEvent) 18680 * ViewGroup#onRequestSendAccessibilityEvent(View, AccessibilityEvent) 18681 */ 18682 public boolean onRequestSendAccessibilityEvent(ViewGroup host, View child, 18683 AccessibilityEvent event) { 18684 return host.onRequestSendAccessibilityEventInternal(child, event); 18685 } 18686 18687 /** 18688 * Gets the provider for managing a virtual view hierarchy rooted at this View 18689 * and reported to {@link android.accessibilityservice.AccessibilityService}s 18690 * that explore the window content. 18691 * <p> 18692 * The default implementation behaves as 18693 * {@link View#getAccessibilityNodeProvider() View#getAccessibilityNodeProvider()} for 18694 * the case of no accessibility delegate been set. 18695 * </p> 18696 * 18697 * @return The provider. 18698 * 18699 * @see AccessibilityNodeProvider 18700 */ 18701 public AccessibilityNodeProvider getAccessibilityNodeProvider(View host) { 18702 return null; 18703 } 18704 18705 /** 18706 * Returns an {@link AccessibilityNodeInfo} representing the host view from the 18707 * point of view of an {@link android.accessibilityservice.AccessibilityService}. 18708 * This method is responsible for obtaining an accessibility node info from a 18709 * pool of reusable instances and calling 18710 * {@link #onInitializeAccessibilityNodeInfo(AccessibilityNodeInfo)} on the host 18711 * view to initialize the former. 18712 * <p> 18713 * <strong>Note:</strong> The client is responsible for recycling the obtained 18714 * instance by calling {@link AccessibilityNodeInfo#recycle()} to minimize object 18715 * creation. 18716 * </p> 18717 * <p> 18718 * The default implementation behaves as 18719 * {@link View#createAccessibilityNodeInfo() View#createAccessibilityNodeInfo()} for 18720 * the case of no accessibility delegate been set. 18721 * </p> 18722 * @return A populated {@link AccessibilityNodeInfo}. 18723 * 18724 * @see AccessibilityNodeInfo 18725 * 18726 * @hide 18727 */ 18728 public AccessibilityNodeInfo createAccessibilityNodeInfo(View host) { 18729 return host.createAccessibilityNodeInfoInternal(); 18730 } 18731 } 18732 18733 private class MatchIdPredicate implements Predicate<View> { 18734 public int mId; 18735 18736 @Override 18737 public boolean apply(View view) { 18738 return (view.mID == mId); 18739 } 18740 } 18741 18742 private class MatchLabelForPredicate implements Predicate<View> { 18743 private int mLabeledId; 18744 18745 @Override 18746 public boolean apply(View view) { 18747 return (view.mLabelForId == mLabeledId); 18748 } 18749 } 18750 18751 /** 18752 * Dump all private flags in readable format, useful for documentation and 18753 * sanity checking. 18754 */ 18755 private static void dumpFlags() { 18756 final HashMap<String, String> found = Maps.newHashMap(); 18757 try { 18758 for (Field field : View.class.getDeclaredFields()) { 18759 final int modifiers = field.getModifiers(); 18760 if (Modifier.isStatic(modifiers) && Modifier.isFinal(modifiers)) { 18761 if (field.getType().equals(int.class)) { 18762 final int value = field.getInt(null); 18763 dumpFlag(found, field.getName(), value); 18764 } else if (field.getType().equals(int[].class)) { 18765 final int[] values = (int[]) field.get(null); 18766 for (int i = 0; i < values.length; i++) { 18767 dumpFlag(found, field.getName() + "[" + i + "]", values[i]); 18768 } 18769 } 18770 } 18771 } 18772 } catch (IllegalAccessException e) { 18773 throw new RuntimeException(e); 18774 } 18775 18776 final ArrayList<String> keys = Lists.newArrayList(); 18777 keys.addAll(found.keySet()); 18778 Collections.sort(keys); 18779 for (String key : keys) { 18780 Log.d(VIEW_LOG_TAG, found.get(key)); 18781 } 18782 } 18783 18784 private static void dumpFlag(HashMap<String, String> found, String name, int value) { 18785 // Sort flags by prefix, then by bits, always keeping unique keys 18786 final String bits = String.format("%32s", Integer.toBinaryString(value)).replace('0', ' '); 18787 final int prefix = name.indexOf('_'); 18788 final String key = (prefix > 0 ? name.substring(0, prefix) : name) + bits + name; 18789 final String output = bits + " " + name; 18790 found.put(key, output); 18791 } 18792 } 18793
