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.animation.LayoutTransition; 20 import android.content.Context; 21 import android.content.res.Configuration; 22 import android.content.res.TypedArray; 23 import android.graphics.Bitmap; 24 import android.graphics.Canvas; 25 import android.graphics.Matrix; 26 import android.graphics.Paint; 27 import android.graphics.PointF; 28 import android.graphics.Rect; 29 import android.graphics.RectF; 30 import android.graphics.Region; 31 import android.os.Build; 32 import android.os.Parcelable; 33 import android.os.SystemClock; 34 import android.util.AttributeSet; 35 import android.util.Log; 36 import android.util.SparseArray; 37 import android.view.accessibility.AccessibilityEvent; 38 import android.view.accessibility.AccessibilityNodeInfo; 39 import android.view.animation.Animation; 40 import android.view.animation.AnimationUtils; 41 import android.view.animation.LayoutAnimationController; 42 import android.view.animation.Transformation; 43 44 import com.android.internal.R; 45 import com.android.internal.util.Predicate; 46 47 import java.util.ArrayList; 48 import java.util.HashSet; 49 50 /** 51 * <p> 52 * A <code>ViewGroup</code> is a special view that can contain other views 53 * (called children.) The view group is the base class for layouts and views 54 * containers. This class also defines the 55 * {@link android.view.ViewGroup.LayoutParams} class which serves as the base 56 * class for layouts parameters. 57 * </p> 58 * 59 * <p> 60 * Also see {@link LayoutParams} for layout attributes. 61 * </p> 62 * 63 * <div class="special reference"> 64 * <h3>Developer Guides</h3> 65 * <p>For more information about creating user interface layouts, read the 66 * <a href="{@docRoot}guide/topics/ui/declaring-layout.html">XML Layouts</a> developer 67 * guide.</p></div> 68 * 69 * @attr ref android.R.styleable#ViewGroup_clipChildren 70 * @attr ref android.R.styleable#ViewGroup_clipToPadding 71 * @attr ref android.R.styleable#ViewGroup_layoutAnimation 72 * @attr ref android.R.styleable#ViewGroup_animationCache 73 * @attr ref android.R.styleable#ViewGroup_persistentDrawingCache 74 * @attr ref android.R.styleable#ViewGroup_alwaysDrawnWithCache 75 * @attr ref android.R.styleable#ViewGroup_addStatesFromChildren 76 * @attr ref android.R.styleable#ViewGroup_descendantFocusability 77 * @attr ref android.R.styleable#ViewGroup_animateLayoutChanges 78 */ 79 public abstract class ViewGroup extends View implements ViewParent, ViewManager { 80 81 private static final boolean DBG = false; 82 83 /** 84 * Views which have been hidden or removed which need to be animated on 85 * their way out. 86 * This field should be made private, so it is hidden from the SDK. 87 * {@hide} 88 */ 89 protected ArrayList<View> mDisappearingChildren; 90 91 /** 92 * Listener used to propagate events indicating when children are added 93 * and/or removed from a view group. 94 * This field should be made private, so it is hidden from the SDK. 95 * {@hide} 96 */ 97 protected OnHierarchyChangeListener mOnHierarchyChangeListener; 98 99 // The view contained within this ViewGroup that has or contains focus. 100 private View mFocused; 101 102 /** 103 * A Transformation used when drawing children, to 104 * apply on the child being drawn. 105 */ 106 private final Transformation mChildTransformation = new Transformation(); 107 108 /** 109 * Used to track the current invalidation region. 110 */ 111 private RectF mInvalidateRegion; 112 113 /** 114 * A Transformation used to calculate a correct 115 * invalidation area when the application is autoscaled. 116 */ 117 private Transformation mInvalidationTransformation; 118 119 // View currently under an ongoing drag 120 private View mCurrentDragView; 121 122 // Metadata about the ongoing drag 123 private DragEvent mCurrentDrag; 124 private HashSet<View> mDragNotifiedChildren; 125 126 // Does this group have a child that can accept the current drag payload? 127 private boolean mChildAcceptsDrag; 128 129 // Used during drag dispatch 130 private final PointF mLocalPoint = new PointF(); 131 132 // Layout animation 133 private LayoutAnimationController mLayoutAnimationController; 134 private Animation.AnimationListener mAnimationListener; 135 136 // First touch target in the linked list of touch targets. 137 private TouchTarget mFirstTouchTarget; 138 139 // For debugging only. You can see these in hierarchyviewer. 140 @SuppressWarnings({"FieldCanBeLocal", "UnusedDeclaration"}) 141 @ViewDebug.ExportedProperty(category = "events") 142 private long mLastTouchDownTime; 143 @ViewDebug.ExportedProperty(category = "events") 144 private int mLastTouchDownIndex = -1; 145 @SuppressWarnings({"FieldCanBeLocal", "UnusedDeclaration"}) 146 @ViewDebug.ExportedProperty(category = "events") 147 private float mLastTouchDownX; 148 @SuppressWarnings({"FieldCanBeLocal", "UnusedDeclaration"}) 149 @ViewDebug.ExportedProperty(category = "events") 150 private float mLastTouchDownY; 151 152 // First hover target in the linked list of hover targets. 153 // The hover targets are children which have received ACTION_HOVER_ENTER. 154 // They might not have actually handled the hover event, but we will 155 // continue sending hover events to them as long as the pointer remains over 156 // their bounds and the view group does not intercept hover. 157 private HoverTarget mFirstHoverTarget; 158 159 // True if the view group itself received a hover event. 160 // It might not have actually handled the hover event. 161 private boolean mHoveredSelf; 162 163 /** 164 * Internal flags. 165 * 166 * This field should be made private, so it is hidden from the SDK. 167 * {@hide} 168 */ 169 protected int mGroupFlags; 170 171 // When set, ViewGroup invalidates only the child's rectangle 172 // Set by default 173 private static final int FLAG_CLIP_CHILDREN = 0x1; 174 175 // When set, ViewGroup excludes the padding area from the invalidate rectangle 176 // Set by default 177 private static final int FLAG_CLIP_TO_PADDING = 0x2; 178 179 // When set, dispatchDraw() will invoke invalidate(); this is set by drawChild() when 180 // a child needs to be invalidated and FLAG_OPTIMIZE_INVALIDATE is set 181 private static final int FLAG_INVALIDATE_REQUIRED = 0x4; 182 183 // When set, dispatchDraw() will run the layout animation and unset the flag 184 private static final int FLAG_RUN_ANIMATION = 0x8; 185 186 // When set, there is either no layout animation on the ViewGroup or the layout 187 // animation is over 188 // Set by default 189 private static final int FLAG_ANIMATION_DONE = 0x10; 190 191 // If set, this ViewGroup has padding; if unset there is no padding and we don't need 192 // to clip it, even if FLAG_CLIP_TO_PADDING is set 193 private static final int FLAG_PADDING_NOT_NULL = 0x20; 194 195 // When set, this ViewGroup caches its children in a Bitmap before starting a layout animation 196 // Set by default 197 private static final int FLAG_ANIMATION_CACHE = 0x40; 198 199 // When set, this ViewGroup converts calls to invalidate(Rect) to invalidate() during a 200 // layout animation; this avoid clobbering the hierarchy 201 // Automatically set when the layout animation starts, depending on the animation's 202 // characteristics 203 private static final int FLAG_OPTIMIZE_INVALIDATE = 0x80; 204 205 // When set, the next call to drawChild() will clear mChildTransformation's matrix 206 private static final int FLAG_CLEAR_TRANSFORMATION = 0x100; 207 208 // When set, this ViewGroup invokes mAnimationListener.onAnimationEnd() and removes 209 // the children's Bitmap caches if necessary 210 // This flag is set when the layout animation is over (after FLAG_ANIMATION_DONE is set) 211 private static final int FLAG_NOTIFY_ANIMATION_LISTENER = 0x200; 212 213 /** 214 * When set, the drawing method will call {@link #getChildDrawingOrder(int, int)} 215 * to get the index of the child to draw for that iteration. 216 * 217 * @hide 218 */ 219 protected static final int FLAG_USE_CHILD_DRAWING_ORDER = 0x400; 220 221 /** 222 * When set, this ViewGroup supports static transformations on children; this causes 223 * {@link #getChildStaticTransformation(View, android.view.animation.Transformation)} to be 224 * invoked when a child is drawn. 225 * 226 * Any subclass overriding 227 * {@link #getChildStaticTransformation(View, android.view.animation.Transformation)} should 228 * set this flags in {@link #mGroupFlags}. 229 * 230 * {@hide} 231 */ 232 protected static final int FLAG_SUPPORT_STATIC_TRANSFORMATIONS = 0x800; 233 234 // When the previous drawChild() invocation used an alpha value that was lower than 235 // 1.0 and set it in mCachePaint 236 private static final int FLAG_ALPHA_LOWER_THAN_ONE = 0x1000; 237 238 /** 239 * When set, this ViewGroup's drawable states also include those 240 * of its children. 241 */ 242 private static final int FLAG_ADD_STATES_FROM_CHILDREN = 0x2000; 243 244 /** 245 * When set, this ViewGroup tries to always draw its children using their drawing cache. 246 */ 247 private static final int FLAG_ALWAYS_DRAWN_WITH_CACHE = 0x4000; 248 249 /** 250 * When set, and if FLAG_ALWAYS_DRAWN_WITH_CACHE is not set, this ViewGroup will try to 251 * draw its children with their drawing cache. 252 */ 253 private static final int FLAG_CHILDREN_DRAWN_WITH_CACHE = 0x8000; 254 255 /** 256 * When set, this group will go through its list of children to notify them of 257 * any drawable state change. 258 */ 259 private static final int FLAG_NOTIFY_CHILDREN_ON_DRAWABLE_STATE_CHANGE = 0x10000; 260 261 private static final int FLAG_MASK_FOCUSABILITY = 0x60000; 262 263 /** 264 * This view will get focus before any of its descendants. 265 */ 266 public static final int FOCUS_BEFORE_DESCENDANTS = 0x20000; 267 268 /** 269 * This view will get focus only if none of its descendants want it. 270 */ 271 public static final int FOCUS_AFTER_DESCENDANTS = 0x40000; 272 273 /** 274 * This view will block any of its descendants from getting focus, even 275 * if they are focusable. 276 */ 277 public static final int FOCUS_BLOCK_DESCENDANTS = 0x60000; 278 279 /** 280 * Used to map between enum in attrubutes and flag values. 281 */ 282 private static final int[] DESCENDANT_FOCUSABILITY_FLAGS = 283 {FOCUS_BEFORE_DESCENDANTS, FOCUS_AFTER_DESCENDANTS, 284 FOCUS_BLOCK_DESCENDANTS}; 285 286 /** 287 * When set, this ViewGroup should not intercept touch events. 288 * {@hide} 289 */ 290 protected static final int FLAG_DISALLOW_INTERCEPT = 0x80000; 291 292 /** 293 * When set, this ViewGroup will split MotionEvents to multiple child Views when appropriate. 294 */ 295 private static final int FLAG_SPLIT_MOTION_EVENTS = 0x200000; 296 297 /** 298 * When set, this ViewGroup will not dispatch onAttachedToWindow calls 299 * to children when adding new views. This is used to prevent multiple 300 * onAttached calls when a ViewGroup adds children in its own onAttached method. 301 */ 302 private static final int FLAG_PREVENT_DISPATCH_ATTACHED_TO_WINDOW = 0x400000; 303 304 /** 305 * Indicates which types of drawing caches are to be kept in memory. 306 * This field should be made private, so it is hidden from the SDK. 307 * {@hide} 308 */ 309 protected int mPersistentDrawingCache; 310 311 /** 312 * Used to indicate that no drawing cache should be kept in memory. 313 */ 314 public static final int PERSISTENT_NO_CACHE = 0x0; 315 316 /** 317 * Used to indicate that the animation drawing cache should be kept in memory. 318 */ 319 public static final int PERSISTENT_ANIMATION_CACHE = 0x1; 320 321 /** 322 * Used to indicate that the scrolling drawing cache should be kept in memory. 323 */ 324 public static final int PERSISTENT_SCROLLING_CACHE = 0x2; 325 326 /** 327 * Used to indicate that all drawing caches should be kept in memory. 328 */ 329 public static final int PERSISTENT_ALL_CACHES = 0x3; 330 331 /** 332 * We clip to padding when FLAG_CLIP_TO_PADDING and FLAG_PADDING_NOT_NULL 333 * are set at the same time. 334 */ 335 protected static final int CLIP_TO_PADDING_MASK = FLAG_CLIP_TO_PADDING | FLAG_PADDING_NOT_NULL; 336 337 // Index of the child's left position in the mLocation array 338 private static final int CHILD_LEFT_INDEX = 0; 339 // Index of the child's top position in the mLocation array 340 private static final int CHILD_TOP_INDEX = 1; 341 342 // Child views of this ViewGroup 343 private View[] mChildren; 344 // Number of valid children in the mChildren array, the rest should be null or not 345 // considered as children 346 347 private boolean mLayoutSuppressed = false; 348 349 private int mChildrenCount; 350 351 private static final int ARRAY_INITIAL_CAPACITY = 12; 352 private static final int ARRAY_CAPACITY_INCREMENT = 12; 353 354 // Used to draw cached views 355 private Paint mCachePaint; 356 357 // Used to animate add/remove changes in layout 358 private LayoutTransition mTransition; 359 360 // The set of views that are currently being transitioned. This list is used to track views 361 // being removed that should not actually be removed from the parent yet because they are 362 // being animated. 363 private ArrayList<View> mTransitioningViews; 364 365 // List of children changing visibility. This is used to potentially keep rendering 366 // views during a transition when they otherwise would have become gone/invisible 367 private ArrayList<View> mVisibilityChangingChildren; 368 369 // Indicates whether this container will use its children layers to draw 370 @ViewDebug.ExportedProperty(category = "drawing") 371 private boolean mDrawLayers = true; 372 373 public ViewGroup(Context context) { 374 super(context); 375 initViewGroup(); 376 } 377 378 public ViewGroup(Context context, AttributeSet attrs) { 379 super(context, attrs); 380 initViewGroup(); 381 initFromAttributes(context, attrs); 382 } 383 384 public ViewGroup(Context context, AttributeSet attrs, int defStyle) { 385 super(context, attrs, defStyle); 386 initViewGroup(); 387 initFromAttributes(context, attrs); 388 } 389 390 private void initViewGroup() { 391 // ViewGroup doesn't draw by default 392 setFlags(WILL_NOT_DRAW, DRAW_MASK); 393 mGroupFlags |= FLAG_CLIP_CHILDREN; 394 mGroupFlags |= FLAG_CLIP_TO_PADDING; 395 mGroupFlags |= FLAG_ANIMATION_DONE; 396 mGroupFlags |= FLAG_ANIMATION_CACHE; 397 mGroupFlags |= FLAG_ALWAYS_DRAWN_WITH_CACHE; 398 399 if (mContext.getApplicationInfo().targetSdkVersion >= Build.VERSION_CODES.HONEYCOMB) { 400 mGroupFlags |= FLAG_SPLIT_MOTION_EVENTS; 401 } 402 403 setDescendantFocusability(FOCUS_BEFORE_DESCENDANTS); 404 405 mChildren = new View[ARRAY_INITIAL_CAPACITY]; 406 mChildrenCount = 0; 407 408 mPersistentDrawingCache = PERSISTENT_SCROLLING_CACHE; 409 } 410 411 private void initFromAttributes(Context context, AttributeSet attrs) { 412 TypedArray a = context.obtainStyledAttributes(attrs, 413 R.styleable.ViewGroup); 414 415 final int N = a.getIndexCount(); 416 for (int i = 0; i < N; i++) { 417 int attr = a.getIndex(i); 418 switch (attr) { 419 case R.styleable.ViewGroup_clipChildren: 420 setClipChildren(a.getBoolean(attr, true)); 421 break; 422 case R.styleable.ViewGroup_clipToPadding: 423 setClipToPadding(a.getBoolean(attr, true)); 424 break; 425 case R.styleable.ViewGroup_animationCache: 426 setAnimationCacheEnabled(a.getBoolean(attr, true)); 427 break; 428 case R.styleable.ViewGroup_persistentDrawingCache: 429 setPersistentDrawingCache(a.getInt(attr, PERSISTENT_SCROLLING_CACHE)); 430 break; 431 case R.styleable.ViewGroup_addStatesFromChildren: 432 setAddStatesFromChildren(a.getBoolean(attr, false)); 433 break; 434 case R.styleable.ViewGroup_alwaysDrawnWithCache: 435 setAlwaysDrawnWithCacheEnabled(a.getBoolean(attr, true)); 436 break; 437 case R.styleable.ViewGroup_layoutAnimation: 438 int id = a.getResourceId(attr, -1); 439 if (id > 0) { 440 setLayoutAnimation(AnimationUtils.loadLayoutAnimation(mContext, id)); 441 } 442 break; 443 case R.styleable.ViewGroup_descendantFocusability: 444 setDescendantFocusability(DESCENDANT_FOCUSABILITY_FLAGS[a.getInt(attr, 0)]); 445 break; 446 case R.styleable.ViewGroup_splitMotionEvents: 447 setMotionEventSplittingEnabled(a.getBoolean(attr, false)); 448 break; 449 case R.styleable.ViewGroup_animateLayoutChanges: 450 boolean animateLayoutChanges = a.getBoolean(attr, false); 451 if (animateLayoutChanges) { 452 setLayoutTransition(new LayoutTransition()); 453 } 454 break; 455 } 456 } 457 458 a.recycle(); 459 } 460 461 /** 462 * Gets the descendant focusability of this view group. The descendant 463 * focusability defines the relationship between this view group and its 464 * descendants when looking for a view to take focus in 465 * {@link #requestFocus(int, android.graphics.Rect)}. 466 * 467 * @return one of {@link #FOCUS_BEFORE_DESCENDANTS}, {@link #FOCUS_AFTER_DESCENDANTS}, 468 * {@link #FOCUS_BLOCK_DESCENDANTS}. 469 */ 470 @ViewDebug.ExportedProperty(category = "focus", mapping = { 471 @ViewDebug.IntToString(from = FOCUS_BEFORE_DESCENDANTS, to = "FOCUS_BEFORE_DESCENDANTS"), 472 @ViewDebug.IntToString(from = FOCUS_AFTER_DESCENDANTS, to = "FOCUS_AFTER_DESCENDANTS"), 473 @ViewDebug.IntToString(from = FOCUS_BLOCK_DESCENDANTS, to = "FOCUS_BLOCK_DESCENDANTS") 474 }) 475 public int getDescendantFocusability() { 476 return mGroupFlags & FLAG_MASK_FOCUSABILITY; 477 } 478 479 /** 480 * Set the descendant focusability of this view group. This defines the relationship 481 * between this view group and its descendants when looking for a view to 482 * take focus in {@link #requestFocus(int, android.graphics.Rect)}. 483 * 484 * @param focusability one of {@link #FOCUS_BEFORE_DESCENDANTS}, {@link #FOCUS_AFTER_DESCENDANTS}, 485 * {@link #FOCUS_BLOCK_DESCENDANTS}. 486 */ 487 public void setDescendantFocusability(int focusability) { 488 switch (focusability) { 489 case FOCUS_BEFORE_DESCENDANTS: 490 case FOCUS_AFTER_DESCENDANTS: 491 case FOCUS_BLOCK_DESCENDANTS: 492 break; 493 default: 494 throw new IllegalArgumentException("must be one of FOCUS_BEFORE_DESCENDANTS, " 495 + "FOCUS_AFTER_DESCENDANTS, FOCUS_BLOCK_DESCENDANTS"); 496 } 497 mGroupFlags &= ~FLAG_MASK_FOCUSABILITY; 498 mGroupFlags |= (focusability & FLAG_MASK_FOCUSABILITY); 499 } 500 501 /** 502 * {@inheritDoc} 503 */ 504 @Override 505 void handleFocusGainInternal(int direction, Rect previouslyFocusedRect) { 506 if (mFocused != null) { 507 mFocused.unFocus(); 508 mFocused = null; 509 } 510 super.handleFocusGainInternal(direction, previouslyFocusedRect); 511 } 512 513 /** 514 * {@inheritDoc} 515 */ 516 public void requestChildFocus(View child, View focused) { 517 if (DBG) { 518 System.out.println(this + " requestChildFocus()"); 519 } 520 if (getDescendantFocusability() == FOCUS_BLOCK_DESCENDANTS) { 521 return; 522 } 523 524 // Unfocus us, if necessary 525 super.unFocus(); 526 527 // We had a previous notion of who had focus. Clear it. 528 if (mFocused != child) { 529 if (mFocused != null) { 530 mFocused.unFocus(); 531 } 532 533 mFocused = child; 534 } 535 if (mParent != null) { 536 mParent.requestChildFocus(this, focused); 537 } 538 } 539 540 /** 541 * {@inheritDoc} 542 */ 543 public void focusableViewAvailable(View v) { 544 if (mParent != null 545 // shortcut: don't report a new focusable view if we block our descendants from 546 // getting focus 547 && (getDescendantFocusability() != FOCUS_BLOCK_DESCENDANTS) 548 // shortcut: don't report a new focusable view if we already are focused 549 // (and we don't prefer our descendants) 550 // 551 // note: knowing that mFocused is non-null is not a good enough reason 552 // to break the traversal since in that case we'd actually have to find 553 // the focused view and make sure it wasn't FOCUS_AFTER_DESCENDANTS and 554 // an ancestor of v; this will get checked for at ViewAncestor 555 && !(isFocused() && getDescendantFocusability() != FOCUS_AFTER_DESCENDANTS)) { 556 mParent.focusableViewAvailable(v); 557 } 558 } 559 560 /** 561 * {@inheritDoc} 562 */ 563 public boolean showContextMenuForChild(View originalView) { 564 return mParent != null && mParent.showContextMenuForChild(originalView); 565 } 566 567 /** 568 * {@inheritDoc} 569 */ 570 public ActionMode startActionModeForChild(View originalView, ActionMode.Callback callback) { 571 return mParent != null ? mParent.startActionModeForChild(originalView, callback) : null; 572 } 573 574 /** 575 * Find the nearest view in the specified direction that wants to take 576 * focus. 577 * 578 * @param focused The view that currently has focus 579 * @param direction One of FOCUS_UP, FOCUS_DOWN, FOCUS_LEFT, and 580 * FOCUS_RIGHT, or 0 for not applicable. 581 */ 582 public View focusSearch(View focused, int direction) { 583 if (isRootNamespace()) { 584 // root namespace means we should consider ourselves the top of the 585 // tree for focus searching; otherwise we could be focus searching 586 // into other tabs. see LocalActivityManager and TabHost for more info 587 return FocusFinder.getInstance().findNextFocus(this, focused, direction); 588 } else if (mParent != null) { 589 return mParent.focusSearch(focused, direction); 590 } 591 return null; 592 } 593 594 /** 595 * {@inheritDoc} 596 */ 597 public boolean requestChildRectangleOnScreen(View child, Rect rectangle, boolean immediate) { 598 return false; 599 } 600 601 /** 602 * {@inheritDoc} 603 */ 604 public boolean requestSendAccessibilityEvent(View child, AccessibilityEvent event) { 605 ViewParent parent = getParent(); 606 if (parent == null) { 607 return false; 608 } 609 final boolean propagate = onRequestSendAccessibilityEvent(child, event); 610 //noinspection SimplifiableIfStatement 611 if (!propagate) { 612 return false; 613 } 614 return parent.requestSendAccessibilityEvent(this, event); 615 } 616 617 /** 618 * Called when a child has requested sending an {@link AccessibilityEvent} and 619 * gives an opportunity to its parent to augment the event. 620 * <p> 621 * If an {@link android.view.View.AccessibilityDelegate} has been specified via calling 622 * {@link android.view.View#setAccessibilityDelegate(android.view.View.AccessibilityDelegate)} its 623 * {@link android.view.View.AccessibilityDelegate#onRequestSendAccessibilityEvent(ViewGroup, View, AccessibilityEvent)} 624 * is responsible for handling this call. 625 * </p> 626 * 627 * @param child The child which requests sending the event. 628 * @param event The event to be sent. 629 * @return True if the event should be sent. 630 * 631 * @see #requestSendAccessibilityEvent(View, AccessibilityEvent) 632 */ 633 public boolean onRequestSendAccessibilityEvent(View child, AccessibilityEvent event) { 634 if (mAccessibilityDelegate != null) { 635 return mAccessibilityDelegate.onRequestSendAccessibilityEvent(this, child, event); 636 } else { 637 return onRequestSendAccessibilityEventInternal(child, event); 638 } 639 } 640 641 /** 642 * @see #onRequestSendAccessibilityEvent(View, AccessibilityEvent) 643 * 644 * Note: Called from the default {@link View.AccessibilityDelegate}. 645 */ 646 boolean onRequestSendAccessibilityEventInternal(View child, AccessibilityEvent event) { 647 return true; 648 } 649 650 /** 651 * {@inheritDoc} 652 */ 653 @Override 654 public boolean dispatchUnhandledMove(View focused, int direction) { 655 return mFocused != null && 656 mFocused.dispatchUnhandledMove(focused, direction); 657 } 658 659 /** 660 * {@inheritDoc} 661 */ 662 public void clearChildFocus(View child) { 663 if (DBG) { 664 System.out.println(this + " clearChildFocus()"); 665 } 666 667 mFocused = null; 668 if (mParent != null) { 669 mParent.clearChildFocus(this); 670 } 671 } 672 673 /** 674 * {@inheritDoc} 675 */ 676 @Override 677 public void clearFocus() { 678 super.clearFocus(); 679 680 // clear any child focus if it exists 681 if (mFocused != null) { 682 mFocused.clearFocus(); 683 } 684 } 685 686 /** 687 * {@inheritDoc} 688 */ 689 @Override 690 void unFocus() { 691 if (DBG) { 692 System.out.println(this + " unFocus()"); 693 } 694 695 super.unFocus(); 696 if (mFocused != null) { 697 mFocused.unFocus(); 698 } 699 mFocused = null; 700 } 701 702 /** 703 * Returns the focused child of this view, if any. The child may have focus 704 * or contain focus. 705 * 706 * @return the focused child or null. 707 */ 708 public View getFocusedChild() { 709 return mFocused; 710 } 711 712 /** 713 * Returns true if this view has or contains focus 714 * 715 * @return true if this view has or contains focus 716 */ 717 @Override 718 public boolean hasFocus() { 719 return (mPrivateFlags & FOCUSED) != 0 || mFocused != null; 720 } 721 722 /* 723 * (non-Javadoc) 724 * 725 * @see android.view.View#findFocus() 726 */ 727 @Override 728 public View findFocus() { 729 if (DBG) { 730 System.out.println("Find focus in " + this + ": flags=" 731 + isFocused() + ", child=" + mFocused); 732 } 733 734 if (isFocused()) { 735 return this; 736 } 737 738 if (mFocused != null) { 739 return mFocused.findFocus(); 740 } 741 return null; 742 } 743 744 /** 745 * {@inheritDoc} 746 */ 747 @Override 748 public boolean hasFocusable() { 749 if ((mViewFlags & VISIBILITY_MASK) != VISIBLE) { 750 return false; 751 } 752 753 if (isFocusable()) { 754 return true; 755 } 756 757 final int descendantFocusability = getDescendantFocusability(); 758 if (descendantFocusability != FOCUS_BLOCK_DESCENDANTS) { 759 final int count = mChildrenCount; 760 final View[] children = mChildren; 761 762 for (int i = 0; i < count; i++) { 763 final View child = children[i]; 764 if (child.hasFocusable()) { 765 return true; 766 } 767 } 768 } 769 770 return false; 771 } 772 773 /** 774 * {@inheritDoc} 775 */ 776 @Override 777 public void addFocusables(ArrayList<View> views, int direction) { 778 addFocusables(views, direction, FOCUSABLES_TOUCH_MODE); 779 } 780 781 /** 782 * {@inheritDoc} 783 */ 784 @Override 785 public void addFocusables(ArrayList<View> views, int direction, int focusableMode) { 786 final int focusableCount = views.size(); 787 788 final int descendantFocusability = getDescendantFocusability(); 789 790 if (descendantFocusability != FOCUS_BLOCK_DESCENDANTS) { 791 final int count = mChildrenCount; 792 final View[] children = mChildren; 793 794 for (int i = 0; i < count; i++) { 795 final View child = children[i]; 796 if ((child.mViewFlags & VISIBILITY_MASK) == VISIBLE) { 797 child.addFocusables(views, direction, focusableMode); 798 } 799 } 800 } 801 802 // we add ourselves (if focusable) in all cases except for when we are 803 // FOCUS_AFTER_DESCENDANTS and there are some descendants focusable. this is 804 // to avoid the focus search finding layouts when a more precise search 805 // among the focusable children would be more interesting. 806 if ( 807 descendantFocusability != FOCUS_AFTER_DESCENDANTS || 808 // No focusable descendants 809 (focusableCount == views.size())) { 810 super.addFocusables(views, direction, focusableMode); 811 } 812 } 813 814 @Override 815 public void findViewsWithText(ArrayList<View> outViews, CharSequence text, int flags) { 816 super.findViewsWithText(outViews, text, flags); 817 final int childrenCount = mChildrenCount; 818 final View[] children = mChildren; 819 for (int i = 0; i < childrenCount; i++) { 820 View child = children[i]; 821 if ((child.mViewFlags & VISIBILITY_MASK) == VISIBLE 822 && (child.mPrivateFlags & IS_ROOT_NAMESPACE) == 0) { 823 child.findViewsWithText(outViews, text, flags); 824 } 825 } 826 } 827 828 @Override 829 View findViewByAccessibilityIdTraversal(int accessibilityId) { 830 View foundView = super.findViewByAccessibilityIdTraversal(accessibilityId); 831 if (foundView != null) { 832 return foundView; 833 } 834 final int childrenCount = mChildrenCount; 835 final View[] children = mChildren; 836 for (int i = 0; i < childrenCount; i++) { 837 View child = children[i]; 838 foundView = child.findViewByAccessibilityIdTraversal(accessibilityId); 839 if (foundView != null) { 840 return foundView; 841 } 842 } 843 return null; 844 } 845 846 /** 847 * {@inheritDoc} 848 */ 849 @Override 850 public void dispatchWindowFocusChanged(boolean hasFocus) { 851 super.dispatchWindowFocusChanged(hasFocus); 852 final int count = mChildrenCount; 853 final View[] children = mChildren; 854 for (int i = 0; i < count; i++) { 855 children[i].dispatchWindowFocusChanged(hasFocus); 856 } 857 } 858 859 /** 860 * {@inheritDoc} 861 */ 862 @Override 863 public void addTouchables(ArrayList<View> views) { 864 super.addTouchables(views); 865 866 final int count = mChildrenCount; 867 final View[] children = mChildren; 868 869 for (int i = 0; i < count; i++) { 870 final View child = children[i]; 871 if ((child.mViewFlags & VISIBILITY_MASK) == VISIBLE) { 872 child.addTouchables(views); 873 } 874 } 875 } 876 877 /** 878 * {@inheritDoc} 879 */ 880 @Override 881 public void dispatchDisplayHint(int hint) { 882 super.dispatchDisplayHint(hint); 883 final int count = mChildrenCount; 884 final View[] children = mChildren; 885 for (int i = 0; i < count; i++) { 886 children[i].dispatchDisplayHint(hint); 887 } 888 } 889 890 /** 891 * @hide 892 * @param child 893 * @param visibility 894 */ 895 protected void onChildVisibilityChanged(View child, int visibility) { 896 if (mTransition != null) { 897 if (visibility == VISIBLE) { 898 mTransition.showChild(this, child); 899 } else { 900 mTransition.hideChild(this, child); 901 } 902 if (visibility != VISIBLE) { 903 // Only track this on disappearing views - appearing views are already visible 904 // and don't need special handling during drawChild() 905 if (mVisibilityChangingChildren == null) { 906 mVisibilityChangingChildren = new ArrayList<View>(); 907 } 908 mVisibilityChangingChildren.add(child); 909 if (mTransitioningViews != null && mTransitioningViews.contains(child)) { 910 addDisappearingView(child); 911 } 912 } 913 } 914 915 // in all cases, for drags 916 if (mCurrentDrag != null) { 917 if (visibility == VISIBLE) { 918 notifyChildOfDrag(child); 919 } 920 } 921 } 922 923 /** 924 * {@inheritDoc} 925 */ 926 @Override 927 protected void dispatchVisibilityChanged(View changedView, int visibility) { 928 super.dispatchVisibilityChanged(changedView, visibility); 929 final int count = mChildrenCount; 930 final View[] children = mChildren; 931 for (int i = 0; i < count; i++) { 932 children[i].dispatchVisibilityChanged(changedView, visibility); 933 } 934 } 935 936 /** 937 * {@inheritDoc} 938 */ 939 @Override 940 public void dispatchWindowVisibilityChanged(int visibility) { 941 super.dispatchWindowVisibilityChanged(visibility); 942 final int count = mChildrenCount; 943 final View[] children = mChildren; 944 for (int i = 0; i < count; i++) { 945 children[i].dispatchWindowVisibilityChanged(visibility); 946 } 947 } 948 949 /** 950 * {@inheritDoc} 951 */ 952 @Override 953 public void dispatchConfigurationChanged(Configuration newConfig) { 954 super.dispatchConfigurationChanged(newConfig); 955 final int count = mChildrenCount; 956 final View[] children = mChildren; 957 for (int i = 0; i < count; i++) { 958 children[i].dispatchConfigurationChanged(newConfig); 959 } 960 } 961 962 /** 963 * {@inheritDoc} 964 */ 965 public void recomputeViewAttributes(View child) { 966 if (mAttachInfo != null && !mAttachInfo.mRecomputeGlobalAttributes) { 967 ViewParent parent = mParent; 968 if (parent != null) parent.recomputeViewAttributes(this); 969 } 970 } 971 972 @Override 973 void dispatchCollectViewAttributes(int visibility) { 974 visibility |= mViewFlags&VISIBILITY_MASK; 975 super.dispatchCollectViewAttributes(visibility); 976 final int count = mChildrenCount; 977 final View[] children = mChildren; 978 for (int i = 0; i < count; i++) { 979 children[i].dispatchCollectViewAttributes(visibility); 980 } 981 } 982 983 /** 984 * {@inheritDoc} 985 */ 986 public void bringChildToFront(View child) { 987 int index = indexOfChild(child); 988 if (index >= 0) { 989 removeFromArray(index); 990 addInArray(child, mChildrenCount); 991 child.mParent = this; 992 } 993 } 994 995 /** 996 * {@inheritDoc} 997 * 998 * !!! TODO: write real docs 999 */ 1000 @Override 1001 public boolean dispatchDragEvent(DragEvent event) { 1002 boolean retval = false; 1003 final float tx = event.mX; 1004 final float ty = event.mY; 1005 1006 ViewRootImpl root = getViewRootImpl(); 1007 1008 // Dispatch down the view hierarchy 1009 switch (event.mAction) { 1010 case DragEvent.ACTION_DRAG_STARTED: { 1011 // clear state to recalculate which views we drag over 1012 mCurrentDragView = null; 1013 1014 // Set up our tracking of drag-started notifications 1015 mCurrentDrag = DragEvent.obtain(event); 1016 if (mDragNotifiedChildren == null) { 1017 mDragNotifiedChildren = new HashSet<View>(); 1018 } else { 1019 mDragNotifiedChildren.clear(); 1020 } 1021 1022 // Now dispatch down to our children, caching the responses 1023 mChildAcceptsDrag = false; 1024 final int count = mChildrenCount; 1025 final View[] children = mChildren; 1026 for (int i = 0; i < count; i++) { 1027 final View child = children[i]; 1028 child.mPrivateFlags2 &= ~View.DRAG_MASK; 1029 if (child.getVisibility() == VISIBLE) { 1030 final boolean handled = notifyChildOfDrag(children[i]); 1031 if (handled) { 1032 mChildAcceptsDrag = true; 1033 } 1034 } 1035 } 1036 1037 // Return HANDLED if one of our children can accept the drag 1038 if (mChildAcceptsDrag) { 1039 retval = true; 1040 } 1041 } break; 1042 1043 case DragEvent.ACTION_DRAG_ENDED: { 1044 // Release the bookkeeping now that the drag lifecycle has ended 1045 if (mDragNotifiedChildren != null) { 1046 for (View child : mDragNotifiedChildren) { 1047 // If a child was notified about an ongoing drag, it's told that it's over 1048 child.dispatchDragEvent(event); 1049 child.mPrivateFlags2 &= ~View.DRAG_MASK; 1050 child.refreshDrawableState(); 1051 } 1052 1053 mDragNotifiedChildren.clear(); 1054 mCurrentDrag.recycle(); 1055 mCurrentDrag = null; 1056 } 1057 1058 // We consider drag-ended to have been handled if one of our children 1059 // had offered to handle the drag. 1060 if (mChildAcceptsDrag) { 1061 retval = true; 1062 } 1063 } break; 1064 1065 case DragEvent.ACTION_DRAG_LOCATION: { 1066 // Find the [possibly new] drag target 1067 final View target = findFrontmostDroppableChildAt(event.mX, event.mY, mLocalPoint); 1068 1069 // If we've changed apparent drag target, tell the view root which view 1070 // we're over now [for purposes of the eventual drag-recipient-changed 1071 // notifications to the framework] and tell the new target that the drag 1072 // has entered its bounds. The root will see setDragFocus() calls all 1073 // the way down to the final leaf view that is handling the LOCATION event 1074 // before reporting the new potential recipient to the framework. 1075 if (mCurrentDragView != target) { 1076 root.setDragFocus(target); 1077 1078 final int action = event.mAction; 1079 // If we've dragged off of a child view, send it the EXITED message 1080 if (mCurrentDragView != null) { 1081 final View view = mCurrentDragView; 1082 event.mAction = DragEvent.ACTION_DRAG_EXITED; 1083 view.dispatchDragEvent(event); 1084 view.mPrivateFlags2 &= ~View.DRAG_HOVERED; 1085 view.refreshDrawableState(); 1086 } 1087 mCurrentDragView = target; 1088 1089 // If we've dragged over a new child view, send it the ENTERED message 1090 if (target != null) { 1091 event.mAction = DragEvent.ACTION_DRAG_ENTERED; 1092 target.dispatchDragEvent(event); 1093 target.mPrivateFlags2 |= View.DRAG_HOVERED; 1094 target.refreshDrawableState(); 1095 } 1096 event.mAction = action; // restore the event's original state 1097 } 1098 1099 // Dispatch the actual drag location notice, localized into its coordinates 1100 if (target != null) { 1101 event.mX = mLocalPoint.x; 1102 event.mY = mLocalPoint.y; 1103 1104 retval = target.dispatchDragEvent(event); 1105 1106 event.mX = tx; 1107 event.mY = ty; 1108 } 1109 } break; 1110 1111 /* Entered / exited dispatch 1112 * 1113 * DRAG_ENTERED is not dispatched downwards from ViewGroup. The reason for this is 1114 * that we're about to get the corresponding LOCATION event, which we will use to 1115 * determine which of our children is the new target; at that point we will 1116 * push a DRAG_ENTERED down to the new target child [which may itself be a ViewGroup]. 1117 * 1118 * DRAG_EXITED *is* dispatched all the way down immediately: once we know the 1119 * drag has left this ViewGroup, we know by definition that every contained subview 1120 * is also no longer under the drag point. 1121 */ 1122 1123 case DragEvent.ACTION_DRAG_EXITED: { 1124 if (mCurrentDragView != null) { 1125 final View view = mCurrentDragView; 1126 view.dispatchDragEvent(event); 1127 view.mPrivateFlags2 &= ~View.DRAG_HOVERED; 1128 view.refreshDrawableState(); 1129 1130 mCurrentDragView = null; 1131 } 1132 } break; 1133 1134 case DragEvent.ACTION_DROP: { 1135 if (ViewDebug.DEBUG_DRAG) Log.d(View.VIEW_LOG_TAG, "Drop event: " + event); 1136 View target = findFrontmostDroppableChildAt(event.mX, event.mY, mLocalPoint); 1137 if (target != null) { 1138 if (ViewDebug.DEBUG_DRAG) Log.d(View.VIEW_LOG_TAG, " dispatch drop to " + target); 1139 event.mX = mLocalPoint.x; 1140 event.mY = mLocalPoint.y; 1141 retval = target.dispatchDragEvent(event); 1142 event.mX = tx; 1143 event.mY = ty; 1144 } else { 1145 if (ViewDebug.DEBUG_DRAG) { 1146 Log.d(View.VIEW_LOG_TAG, " not dropped on an accepting view"); 1147 } 1148 } 1149 } break; 1150 } 1151 1152 // If none of our children could handle the event, try here 1153 if (!retval) { 1154 // Call up to the View implementation that dispatches to installed listeners 1155 retval = super.dispatchDragEvent(event); 1156 } 1157 return retval; 1158 } 1159 1160 // Find the frontmost child view that lies under the given point, and calculate 1161 // the position within its own local coordinate system. 1162 View findFrontmostDroppableChildAt(float x, float y, PointF outLocalPoint) { 1163 final int count = mChildrenCount; 1164 final View[] children = mChildren; 1165 for (int i = count - 1; i >= 0; i--) { 1166 final View child = children[i]; 1167 if (!child.canAcceptDrag()) { 1168 continue; 1169 } 1170 1171 if (isTransformedTouchPointInView(x, y, child, outLocalPoint)) { 1172 return child; 1173 } 1174 } 1175 return null; 1176 } 1177 1178 boolean notifyChildOfDrag(View child) { 1179 if (ViewDebug.DEBUG_DRAG) { 1180 Log.d(View.VIEW_LOG_TAG, "Sending drag-started to view: " + child); 1181 } 1182 1183 boolean canAccept = false; 1184 if (! mDragNotifiedChildren.contains(child)) { 1185 mDragNotifiedChildren.add(child); 1186 canAccept = child.dispatchDragEvent(mCurrentDrag); 1187 if (canAccept && !child.canAcceptDrag()) { 1188 child.mPrivateFlags2 |= View.DRAG_CAN_ACCEPT; 1189 child.refreshDrawableState(); 1190 } 1191 } 1192 return canAccept; 1193 } 1194 1195 @Override 1196 public void dispatchSystemUiVisibilityChanged(int visible) { 1197 super.dispatchSystemUiVisibilityChanged(visible); 1198 1199 final int count = mChildrenCount; 1200 final View[] children = mChildren; 1201 for (int i=0; i <count; i++) { 1202 final View child = children[i]; 1203 child.dispatchSystemUiVisibilityChanged(visible); 1204 } 1205 } 1206 1207 @Override 1208 void updateLocalSystemUiVisibility(int localValue, int localChanges) { 1209 super.updateLocalSystemUiVisibility(localValue, localChanges); 1210 1211 final int count = mChildrenCount; 1212 final View[] children = mChildren; 1213 for (int i=0; i <count; i++) { 1214 final View child = children[i]; 1215 child.updateLocalSystemUiVisibility(localValue, localChanges); 1216 } 1217 } 1218 1219 /** 1220 * {@inheritDoc} 1221 */ 1222 @Override 1223 public boolean dispatchKeyEventPreIme(KeyEvent event) { 1224 if ((mPrivateFlags & (FOCUSED | HAS_BOUNDS)) == (FOCUSED | HAS_BOUNDS)) { 1225 return super.dispatchKeyEventPreIme(event); 1226 } else if (mFocused != null && (mFocused.mPrivateFlags & HAS_BOUNDS) == HAS_BOUNDS) { 1227 return mFocused.dispatchKeyEventPreIme(event); 1228 } 1229 return false; 1230 } 1231 1232 /** 1233 * {@inheritDoc} 1234 */ 1235 @Override 1236 public boolean dispatchKeyEvent(KeyEvent event) { 1237 if (mInputEventConsistencyVerifier != null) { 1238 mInputEventConsistencyVerifier.onKeyEvent(event, 1); 1239 } 1240 1241 if ((mPrivateFlags & (FOCUSED | HAS_BOUNDS)) == (FOCUSED | HAS_BOUNDS)) { 1242 if (super.dispatchKeyEvent(event)) { 1243 return true; 1244 } 1245 } else if (mFocused != null && (mFocused.mPrivateFlags & HAS_BOUNDS) == HAS_BOUNDS) { 1246 if (mFocused.dispatchKeyEvent(event)) { 1247 return true; 1248 } 1249 } 1250 1251 if (mInputEventConsistencyVerifier != null) { 1252 mInputEventConsistencyVerifier.onUnhandledEvent(event, 1); 1253 } 1254 return false; 1255 } 1256 1257 /** 1258 * {@inheritDoc} 1259 */ 1260 @Override 1261 public boolean dispatchKeyShortcutEvent(KeyEvent event) { 1262 if ((mPrivateFlags & (FOCUSED | HAS_BOUNDS)) == (FOCUSED | HAS_BOUNDS)) { 1263 return super.dispatchKeyShortcutEvent(event); 1264 } else if (mFocused != null && (mFocused.mPrivateFlags & HAS_BOUNDS) == HAS_BOUNDS) { 1265 return mFocused.dispatchKeyShortcutEvent(event); 1266 } 1267 return false; 1268 } 1269 1270 /** 1271 * {@inheritDoc} 1272 */ 1273 @Override 1274 public boolean dispatchTrackballEvent(MotionEvent event) { 1275 if (mInputEventConsistencyVerifier != null) { 1276 mInputEventConsistencyVerifier.onTrackballEvent(event, 1); 1277 } 1278 1279 if ((mPrivateFlags & (FOCUSED | HAS_BOUNDS)) == (FOCUSED | HAS_BOUNDS)) { 1280 if (super.dispatchTrackballEvent(event)) { 1281 return true; 1282 } 1283 } else if (mFocused != null && (mFocused.mPrivateFlags & HAS_BOUNDS) == HAS_BOUNDS) { 1284 if (mFocused.dispatchTrackballEvent(event)) { 1285 return true; 1286 } 1287 } 1288 1289 if (mInputEventConsistencyVerifier != null) { 1290 mInputEventConsistencyVerifier.onUnhandledEvent(event, 1); 1291 } 1292 return false; 1293 } 1294 1295 /** 1296 * {@inheritDoc} 1297 */ 1298 @SuppressWarnings({"ConstantConditions"}) 1299 @Override 1300 protected boolean dispatchHoverEvent(MotionEvent event) { 1301 final int action = event.getAction(); 1302 1303 // First check whether the view group wants to intercept the hover event. 1304 final boolean interceptHover = onInterceptHoverEvent(event); 1305 event.setAction(action); // restore action in case it was changed 1306 1307 MotionEvent eventNoHistory = event; 1308 boolean handled = false; 1309 1310 // Send events to the hovered children and build a new list of hover targets until 1311 // one is found that handles the event. 1312 HoverTarget firstOldHoverTarget = mFirstHoverTarget; 1313 mFirstHoverTarget = null; 1314 if (!interceptHover && action != MotionEvent.ACTION_HOVER_EXIT) { 1315 final float x = event.getX(); 1316 final float y = event.getY(); 1317 final int childrenCount = mChildrenCount; 1318 if (childrenCount != 0) { 1319 final View[] children = mChildren; 1320 HoverTarget lastHoverTarget = null; 1321 for (int i = childrenCount - 1; i >= 0; i--) { 1322 final View child = children[i]; 1323 if (!canViewReceivePointerEvents(child) 1324 || !isTransformedTouchPointInView(x, y, child, null)) { 1325 continue; 1326 } 1327 1328 // Obtain a hover target for this child. Dequeue it from the 1329 // old hover target list if the child was previously hovered. 1330 HoverTarget hoverTarget = firstOldHoverTarget; 1331 final boolean wasHovered; 1332 for (HoverTarget predecessor = null; ;) { 1333 if (hoverTarget == null) { 1334 hoverTarget = HoverTarget.obtain(child); 1335 wasHovered = false; 1336 break; 1337 } 1338 1339 if (hoverTarget.child == child) { 1340 if (predecessor != null) { 1341 predecessor.next = hoverTarget.next; 1342 } else { 1343 firstOldHoverTarget = hoverTarget.next; 1344 } 1345 hoverTarget.next = null; 1346 wasHovered = true; 1347 break; 1348 } 1349 1350 predecessor = hoverTarget; 1351 hoverTarget = hoverTarget.next; 1352 } 1353 1354 // Enqueue the hover target onto the new hover target list. 1355 if (lastHoverTarget != null) { 1356 lastHoverTarget.next = hoverTarget; 1357 } else { 1358 lastHoverTarget = hoverTarget; 1359 mFirstHoverTarget = hoverTarget; 1360 } 1361 1362 // Dispatch the event to the child. 1363 if (action == MotionEvent.ACTION_HOVER_ENTER) { 1364 if (!wasHovered) { 1365 // Send the enter as is. 1366 handled |= dispatchTransformedGenericPointerEvent( 1367 event, child); // enter 1368 } 1369 } else if (action == MotionEvent.ACTION_HOVER_MOVE) { 1370 if (!wasHovered) { 1371 // Synthesize an enter from a move. 1372 eventNoHistory = obtainMotionEventNoHistoryOrSelf(eventNoHistory); 1373 eventNoHistory.setAction(MotionEvent.ACTION_HOVER_ENTER); 1374 handled |= dispatchTransformedGenericPointerEvent( 1375 eventNoHistory, child); // enter 1376 eventNoHistory.setAction(action); 1377 1378 handled |= dispatchTransformedGenericPointerEvent( 1379 eventNoHistory, child); // move 1380 } else { 1381 // Send the move as is. 1382 handled |= dispatchTransformedGenericPointerEvent(event, child); 1383 } 1384 } 1385 if (handled) { 1386 break; 1387 } 1388 } 1389 } 1390 } 1391 1392 // Send exit events to all previously hovered children that are no longer hovered. 1393 while (firstOldHoverTarget != null) { 1394 final View child = firstOldHoverTarget.child; 1395 1396 // Exit the old hovered child. 1397 if (action == MotionEvent.ACTION_HOVER_EXIT) { 1398 // Send the exit as is. 1399 handled |= dispatchTransformedGenericPointerEvent( 1400 event, child); // exit 1401 } else { 1402 // Synthesize an exit from a move or enter. 1403 // Ignore the result because hover focus has moved to a different view. 1404 if (action == MotionEvent.ACTION_HOVER_MOVE) { 1405 dispatchTransformedGenericPointerEvent( 1406 event, child); // move 1407 } 1408 eventNoHistory = obtainMotionEventNoHistoryOrSelf(eventNoHistory); 1409 eventNoHistory.setAction(MotionEvent.ACTION_HOVER_EXIT); 1410 dispatchTransformedGenericPointerEvent( 1411 eventNoHistory, child); // exit 1412 eventNoHistory.setAction(action); 1413 } 1414 1415 final HoverTarget nextOldHoverTarget = firstOldHoverTarget.next; 1416 firstOldHoverTarget.recycle(); 1417 firstOldHoverTarget = nextOldHoverTarget; 1418 } 1419 1420 // Send events to the view group itself if no children have handled it. 1421 boolean newHoveredSelf = !handled; 1422 if (newHoveredSelf == mHoveredSelf) { 1423 if (newHoveredSelf) { 1424 // Send event to the view group as before. 1425 handled |= super.dispatchHoverEvent(event); 1426 } 1427 } else { 1428 if (mHoveredSelf) { 1429 // Exit the view group. 1430 if (action == MotionEvent.ACTION_HOVER_EXIT) { 1431 // Send the exit as is. 1432 handled |= super.dispatchHoverEvent(event); // exit 1433 } else { 1434 // Synthesize an exit from a move or enter. 1435 // Ignore the result because hover focus is moving to a different view. 1436 if (action == MotionEvent.ACTION_HOVER_MOVE) { 1437 super.dispatchHoverEvent(event); // move 1438 } 1439 eventNoHistory = obtainMotionEventNoHistoryOrSelf(eventNoHistory); 1440 eventNoHistory.setAction(MotionEvent.ACTION_HOVER_EXIT); 1441 super.dispatchHoverEvent(eventNoHistory); // exit 1442 eventNoHistory.setAction(action); 1443 } 1444 mHoveredSelf = false; 1445 } 1446 1447 if (newHoveredSelf) { 1448 // Enter the view group. 1449 if (action == MotionEvent.ACTION_HOVER_ENTER) { 1450 // Send the enter as is. 1451 handled |= super.dispatchHoverEvent(event); // enter 1452 mHoveredSelf = true; 1453 } else if (action == MotionEvent.ACTION_HOVER_MOVE) { 1454 // Synthesize an enter from a move. 1455 eventNoHistory = obtainMotionEventNoHistoryOrSelf(eventNoHistory); 1456 eventNoHistory.setAction(MotionEvent.ACTION_HOVER_ENTER); 1457 handled |= super.dispatchHoverEvent(eventNoHistory); // enter 1458 eventNoHistory.setAction(action); 1459 1460 handled |= super.dispatchHoverEvent(eventNoHistory); // move 1461 mHoveredSelf = true; 1462 } 1463 } 1464 } 1465 1466 // Recycle the copy of the event that we made. 1467 if (eventNoHistory != event) { 1468 eventNoHistory.recycle(); 1469 } 1470 1471 // Done. 1472 return handled; 1473 } 1474 1475 /** @hide */ 1476 @Override 1477 protected boolean hasHoveredChild() { 1478 return mFirstHoverTarget != null; 1479 } 1480 1481 /** 1482 * Implement this method to intercept hover events before they are handled 1483 * by child views. 1484 * <p> 1485 * This method is called before dispatching a hover event to a child of 1486 * the view group or to the view group's own {@link #onHoverEvent} to allow 1487 * the view group a chance to intercept the hover event. 1488 * This method can also be used to watch all pointer motions that occur within 1489 * the bounds of the view group even when the pointer is hovering over 1490 * a child of the view group rather than over the view group itself. 1491 * </p><p> 1492 * The view group can prevent its children from receiving hover events by 1493 * implementing this method and returning <code>true</code> to indicate 1494 * that it would like to intercept hover events. The view group must 1495 * continuously return <code>true</code> from {@link #onInterceptHoverEvent} 1496 * for as long as it wishes to continue intercepting hover events from 1497 * its children. 1498 * </p><p> 1499 * Interception preserves the invariant that at most one view can be 1500 * hovered at a time by transferring hover focus from the currently hovered 1501 * child to the view group or vice-versa as needed. 1502 * </p><p> 1503 * If this method returns <code>true</code> and a child is already hovered, then the 1504 * child view will first receive a hover exit event and then the view group 1505 * itself will receive a hover enter event in {@link #onHoverEvent}. 1506 * Likewise, if this method had previously returned <code>true</code> to intercept hover 1507 * events and instead returns <code>false</code> while the pointer is hovering 1508 * within the bounds of one of a child, then the view group will first receive a 1509 * hover exit event in {@link #onHoverEvent} and then the hovered child will 1510 * receive a hover enter event. 1511 * </p><p> 1512 * The default implementation always returns false. 1513 * </p> 1514 * 1515 * @param event The motion event that describes the hover. 1516 * @return True if the view group would like to intercept the hover event 1517 * and prevent its children from receiving it. 1518 */ 1519 public boolean onInterceptHoverEvent(MotionEvent event) { 1520 return false; 1521 } 1522 1523 private static MotionEvent obtainMotionEventNoHistoryOrSelf(MotionEvent event) { 1524 if (event.getHistorySize() == 0) { 1525 return event; 1526 } 1527 return MotionEvent.obtainNoHistory(event); 1528 } 1529 1530 /** 1531 * {@inheritDoc} 1532 */ 1533 @Override 1534 protected boolean dispatchGenericPointerEvent(MotionEvent event) { 1535 // Send the event to the child under the pointer. 1536 final int childrenCount = mChildrenCount; 1537 if (childrenCount != 0) { 1538 final View[] children = mChildren; 1539 final float x = event.getX(); 1540 final float y = event.getY(); 1541 1542 for (int i = childrenCount - 1; i >= 0; i--) { 1543 final View child = children[i]; 1544 if (!canViewReceivePointerEvents(child) 1545 || !isTransformedTouchPointInView(x, y, child, null)) { 1546 continue; 1547 } 1548 1549 if (dispatchTransformedGenericPointerEvent(event, child)) { 1550 return true; 1551 } 1552 } 1553 } 1554 1555 // No child handled the event. Send it to this view group. 1556 return super.dispatchGenericPointerEvent(event); 1557 } 1558 1559 /** 1560 * {@inheritDoc} 1561 */ 1562 @Override 1563 protected boolean dispatchGenericFocusedEvent(MotionEvent event) { 1564 // Send the event to the focused child or to this view group if it has focus. 1565 if ((mPrivateFlags & (FOCUSED | HAS_BOUNDS)) == (FOCUSED | HAS_BOUNDS)) { 1566 return super.dispatchGenericFocusedEvent(event); 1567 } else if (mFocused != null && (mFocused.mPrivateFlags & HAS_BOUNDS) == HAS_BOUNDS) { 1568 return mFocused.dispatchGenericMotionEvent(event); 1569 } 1570 return false; 1571 } 1572 1573 /** 1574 * Dispatches a generic pointer event to a child, taking into account 1575 * transformations that apply to the child. 1576 * 1577 * @param event The event to send. 1578 * @param child The view to send the event to. 1579 * @return {@code true} if the child handled the event. 1580 */ 1581 private boolean dispatchTransformedGenericPointerEvent(MotionEvent event, View child) { 1582 final float offsetX = mScrollX - child.mLeft; 1583 final float offsetY = mScrollY - child.mTop; 1584 1585 boolean handled; 1586 if (!child.hasIdentityMatrix()) { 1587 MotionEvent transformedEvent = MotionEvent.obtain(event); 1588 transformedEvent.offsetLocation(offsetX, offsetY); 1589 transformedEvent.transform(child.getInverseMatrix()); 1590 handled = child.dispatchGenericMotionEvent(transformedEvent); 1591 transformedEvent.recycle(); 1592 } else { 1593 event.offsetLocation(offsetX, offsetY); 1594 handled = child.dispatchGenericMotionEvent(event); 1595 event.offsetLocation(-offsetX, -offsetY); 1596 } 1597 return handled; 1598 } 1599 1600 /** 1601 * {@inheritDoc} 1602 */ 1603 @Override 1604 public boolean dispatchTouchEvent(MotionEvent ev) { 1605 if (mInputEventConsistencyVerifier != null) { 1606 mInputEventConsistencyVerifier.onTouchEvent(ev, 1); 1607 } 1608 1609 boolean handled = false; 1610 if (onFilterTouchEventForSecurity(ev)) { 1611 final int action = ev.getAction(); 1612 final int actionMasked = action & MotionEvent.ACTION_MASK; 1613 1614 // Handle an initial down. 1615 if (actionMasked == MotionEvent.ACTION_DOWN) { 1616 // Throw away all previous state when starting a new touch gesture. 1617 // The framework may have dropped the up or cancel event for the previous gesture 1618 // due to an app switch, ANR, or some other state change. 1619 cancelAndClearTouchTargets(ev); 1620 resetTouchState(); 1621 } 1622 1623 // Check for interception. 1624 final boolean intercepted; 1625 if (actionMasked == MotionEvent.ACTION_DOWN 1626 || mFirstTouchTarget != null) { 1627 final boolean disallowIntercept = (mGroupFlags & FLAG_DISALLOW_INTERCEPT) != 0; 1628 if (!disallowIntercept) { 1629 intercepted = onInterceptTouchEvent(ev); 1630 ev.setAction(action); // restore action in case it was changed 1631 } else { 1632 intercepted = false; 1633 } 1634 } else { 1635 // There are no touch targets and this action is not an initial down 1636 // so this view group continues to intercept touches. 1637 intercepted = true; 1638 } 1639 1640 // Check for cancelation. 1641 final boolean canceled = resetCancelNextUpFlag(this) 1642 || actionMasked == MotionEvent.ACTION_CANCEL; 1643 1644 // Update list of touch targets for pointer down, if needed. 1645 final boolean split = (mGroupFlags & FLAG_SPLIT_MOTION_EVENTS) != 0; 1646 TouchTarget newTouchTarget = null; 1647 boolean alreadyDispatchedToNewTouchTarget = false; 1648 if (!canceled && !intercepted) { 1649 if (actionMasked == MotionEvent.ACTION_DOWN 1650 || (split && actionMasked == MotionEvent.ACTION_POINTER_DOWN) 1651 || actionMasked == MotionEvent.ACTION_HOVER_MOVE) { 1652 final int actionIndex = ev.getActionIndex(); // always 0 for down 1653 final int idBitsToAssign = split ? 1 << ev.getPointerId(actionIndex) 1654 : TouchTarget.ALL_POINTER_IDS; 1655 1656 // Clean up earlier touch targets for this pointer id in case they 1657 // have become out of sync. 1658 removePointersFromTouchTargets(idBitsToAssign); 1659 1660 final int childrenCount = mChildrenCount; 1661 if (childrenCount != 0) { 1662 // Find a child that can receive the event. 1663 // Scan children from front to back. 1664 final View[] children = mChildren; 1665 final float x = ev.getX(actionIndex); 1666 final float y = ev.getY(actionIndex); 1667 1668 for (int i = childrenCount - 1; i >= 0; i--) { 1669 final View child = children[i]; 1670 if (!canViewReceivePointerEvents(child) 1671 || !isTransformedTouchPointInView(x, y, child, null)) { 1672 continue; 1673 } 1674 1675 newTouchTarget = getTouchTarget(child); 1676 if (newTouchTarget != null) { 1677 // Child is already receiving touch within its bounds. 1678 // Give it the new pointer in addition to the ones it is handling. 1679 newTouchTarget.pointerIdBits |= idBitsToAssign; 1680 break; 1681 } 1682 1683 resetCancelNextUpFlag(child); 1684 if (dispatchTransformedTouchEvent(ev, false, child, idBitsToAssign)) { 1685 // Child wants to receive touch within its bounds. 1686 mLastTouchDownTime = ev.getDownTime(); 1687 mLastTouchDownIndex = i; 1688 mLastTouchDownX = ev.getX(); 1689 mLastTouchDownY = ev.getY(); 1690 newTouchTarget = addTouchTarget(child, idBitsToAssign); 1691 alreadyDispatchedToNewTouchTarget = true; 1692 break; 1693 } 1694 } 1695 } 1696 1697 if (newTouchTarget == null && mFirstTouchTarget != null) { 1698 // Did not find a child to receive the event. 1699 // Assign the pointer to the least recently added target. 1700 newTouchTarget = mFirstTouchTarget; 1701 while (newTouchTarget.next != null) { 1702 newTouchTarget = newTouchTarget.next; 1703 } 1704 newTouchTarget.pointerIdBits |= idBitsToAssign; 1705 } 1706 } 1707 } 1708 1709 // Dispatch to touch targets. 1710 if (mFirstTouchTarget == null) { 1711 // No touch targets so treat this as an ordinary view. 1712 handled = dispatchTransformedTouchEvent(ev, canceled, null, 1713 TouchTarget.ALL_POINTER_IDS); 1714 } else { 1715 // Dispatch to touch targets, excluding the new touch target if we already 1716 // dispatched to it. Cancel touch targets if necessary. 1717 TouchTarget predecessor = null; 1718 TouchTarget target = mFirstTouchTarget; 1719 while (target != null) { 1720 final TouchTarget next = target.next; 1721 if (alreadyDispatchedToNewTouchTarget && target == newTouchTarget) { 1722 handled = true; 1723 } else { 1724 final boolean cancelChild = resetCancelNextUpFlag(target.child) 1725 || intercepted; 1726 if (dispatchTransformedTouchEvent(ev, cancelChild, 1727 target.child, target.pointerIdBits)) { 1728 handled = true; 1729 } 1730 if (cancelChild) { 1731 if (predecessor == null) { 1732 mFirstTouchTarget = next; 1733 } else { 1734 predecessor.next = next; 1735 } 1736 target.recycle(); 1737 target = next; 1738 continue; 1739 } 1740 } 1741 predecessor = target; 1742 target = next; 1743 } 1744 } 1745 1746 // Update list of touch targets for pointer up or cancel, if needed. 1747 if (canceled 1748 || actionMasked == MotionEvent.ACTION_UP 1749 || actionMasked == MotionEvent.ACTION_HOVER_MOVE) { 1750 resetTouchState(); 1751 } else if (split && actionMasked == MotionEvent.ACTION_POINTER_UP) { 1752 final int actionIndex = ev.getActionIndex(); 1753 final int idBitsToRemove = 1 << ev.getPointerId(actionIndex); 1754 removePointersFromTouchTargets(idBitsToRemove); 1755 } 1756 } 1757 1758 if (!handled && mInputEventConsistencyVerifier != null) { 1759 mInputEventConsistencyVerifier.onUnhandledEvent(ev, 1); 1760 } 1761 return handled; 1762 } 1763 1764 /** 1765 * Resets all touch state in preparation for a new cycle. 1766 */ 1767 private void resetTouchState() { 1768 clearTouchTargets(); 1769 resetCancelNextUpFlag(this); 1770 mGroupFlags &= ~FLAG_DISALLOW_INTERCEPT; 1771 } 1772 1773 /** 1774 * Resets the cancel next up flag. 1775 * Returns true if the flag was previously set. 1776 */ 1777 private boolean resetCancelNextUpFlag(View view) { 1778 if ((view.mPrivateFlags & CANCEL_NEXT_UP_EVENT) != 0) { 1779 view.mPrivateFlags &= ~CANCEL_NEXT_UP_EVENT; 1780 return true; 1781 } 1782 return false; 1783 } 1784 1785 /** 1786 * Clears all touch targets. 1787 */ 1788 private void clearTouchTargets() { 1789 TouchTarget target = mFirstTouchTarget; 1790 if (target != null) { 1791 do { 1792 TouchTarget next = target.next; 1793 target.recycle(); 1794 target = next; 1795 } while (target != null); 1796 mFirstTouchTarget = null; 1797 } 1798 } 1799 1800 /** 1801 * Cancels and clears all touch targets. 1802 */ 1803 private void cancelAndClearTouchTargets(MotionEvent event) { 1804 if (mFirstTouchTarget != null) { 1805 boolean syntheticEvent = false; 1806 if (event == null) { 1807 final long now = SystemClock.uptimeMillis(); 1808 event = MotionEvent.obtain(now, now, 1809 MotionEvent.ACTION_CANCEL, 0.0f, 0.0f, 0); 1810 event.setSource(InputDevice.SOURCE_TOUCHSCREEN); 1811 syntheticEvent = true; 1812 } 1813 1814 for (TouchTarget target = mFirstTouchTarget; target != null; target = target.next) { 1815 resetCancelNextUpFlag(target.child); 1816 dispatchTransformedTouchEvent(event, true, target.child, target.pointerIdBits); 1817 } 1818 clearTouchTargets(); 1819 1820 if (syntheticEvent) { 1821 event.recycle(); 1822 } 1823 } 1824 } 1825 1826 /** 1827 * Gets the touch target for specified child view. 1828 * Returns null if not found. 1829 */ 1830 private TouchTarget getTouchTarget(View child) { 1831 for (TouchTarget target = mFirstTouchTarget; target != null; target = target.next) { 1832 if (target.child == child) { 1833 return target; 1834 } 1835 } 1836 return null; 1837 } 1838 1839 /** 1840 * Adds a touch target for specified child to the beginning of the list. 1841 * Assumes the target child is not already present. 1842 */ 1843 private TouchTarget addTouchTarget(View child, int pointerIdBits) { 1844 TouchTarget target = TouchTarget.obtain(child, pointerIdBits); 1845 target.next = mFirstTouchTarget; 1846 mFirstTouchTarget = target; 1847 return target; 1848 } 1849 1850 /** 1851 * Removes the pointer ids from consideration. 1852 */ 1853 private void removePointersFromTouchTargets(int pointerIdBits) { 1854 TouchTarget predecessor = null; 1855 TouchTarget target = mFirstTouchTarget; 1856 while (target != null) { 1857 final TouchTarget next = target.next; 1858 if ((target.pointerIdBits & pointerIdBits) != 0) { 1859 target.pointerIdBits &= ~pointerIdBits; 1860 if (target.pointerIdBits == 0) { 1861 if (predecessor == null) { 1862 mFirstTouchTarget = next; 1863 } else { 1864 predecessor.next = next; 1865 } 1866 target.recycle(); 1867 target = next; 1868 continue; 1869 } 1870 } 1871 predecessor = target; 1872 target = next; 1873 } 1874 } 1875 1876 /** 1877 * Returns true if a child view can receive pointer events. 1878 * @hide 1879 */ 1880 private static boolean canViewReceivePointerEvents(View child) { 1881 return (child.mViewFlags & VISIBILITY_MASK) == VISIBLE 1882 || child.getAnimation() != null; 1883 } 1884 1885 /** 1886 * Returns true if a child view contains the specified point when transformed 1887 * into its coordinate space. 1888 * Child must not be null. 1889 * @hide 1890 */ 1891 protected boolean isTransformedTouchPointInView(float x, float y, View child, 1892 PointF outLocalPoint) { 1893 float localX = x + mScrollX - child.mLeft; 1894 float localY = y + mScrollY - child.mTop; 1895 if (! child.hasIdentityMatrix() && mAttachInfo != null) { 1896 final float[] localXY = mAttachInfo.mTmpTransformLocation; 1897 localXY[0] = localX; 1898 localXY[1] = localY; 1899 child.getInverseMatrix().mapPoints(localXY); 1900 localX = localXY[0]; 1901 localY = localXY[1]; 1902 } 1903 final boolean isInView = child.pointInView(localX, localY); 1904 if (isInView && outLocalPoint != null) { 1905 outLocalPoint.set(localX, localY); 1906 } 1907 return isInView; 1908 } 1909 1910 /** 1911 * Transforms a motion event into the coordinate space of a particular child view, 1912 * filters out irrelevant pointer ids, and overrides its action if necessary. 1913 * If child is null, assumes the MotionEvent will be sent to this ViewGroup instead. 1914 */ 1915 private boolean dispatchTransformedTouchEvent(MotionEvent event, boolean cancel, 1916 View child, int desiredPointerIdBits) { 1917 final boolean handled; 1918 1919 // Canceling motions is a special case. We don't need to perform any transformations 1920 // or filtering. The important part is the action, not the contents. 1921 final int oldAction = event.getAction(); 1922 if (cancel || oldAction == MotionEvent.ACTION_CANCEL) { 1923 event.setAction(MotionEvent.ACTION_CANCEL); 1924 if (child == null) { 1925 handled = super.dispatchTouchEvent(event); 1926 } else { 1927 handled = child.dispatchTouchEvent(event); 1928 } 1929 event.setAction(oldAction); 1930 return handled; 1931 } 1932 1933 // Calculate the number of pointers to deliver. 1934 final int oldPointerIdBits = event.getPointerIdBits(); 1935 final int newPointerIdBits = oldPointerIdBits & desiredPointerIdBits; 1936 1937 // If for some reason we ended up in an inconsistent state where it looks like we 1938 // might produce a motion event with no pointers in it, then drop the event. 1939 if (newPointerIdBits == 0) { 1940 return false; 1941 } 1942 1943 // If the number of pointers is the same and we don't need to perform any fancy 1944 // irreversible transformations, then we can reuse the motion event for this 1945 // dispatch as long as we are careful to revert any changes we make. 1946 // Otherwise we need to make a copy. 1947 final MotionEvent transformedEvent; 1948 if (newPointerIdBits == oldPointerIdBits) { 1949 if (child == null || child.hasIdentityMatrix()) { 1950 if (child == null) { 1951 handled = super.dispatchTouchEvent(event); 1952 } else { 1953 final float offsetX = mScrollX - child.mLeft; 1954 final float offsetY = mScrollY - child.mTop; 1955 event.offsetLocation(offsetX, offsetY); 1956 1957 handled = child.dispatchTouchEvent(event); 1958 1959 event.offsetLocation(-offsetX, -offsetY); 1960 } 1961 return handled; 1962 } 1963 transformedEvent = MotionEvent.obtain(event); 1964 } else { 1965 transformedEvent = event.split(newPointerIdBits); 1966 } 1967 1968 // Perform any necessary transformations and dispatch. 1969 if (child == null) { 1970 handled = super.dispatchTouchEvent(transformedEvent); 1971 } else { 1972 final float offsetX = mScrollX - child.mLeft; 1973 final float offsetY = mScrollY - child.mTop; 1974 transformedEvent.offsetLocation(offsetX, offsetY); 1975 if (! child.hasIdentityMatrix()) { 1976 transformedEvent.transform(child.getInverseMatrix()); 1977 } 1978 1979 handled = child.dispatchTouchEvent(transformedEvent); 1980 } 1981 1982 // Done. 1983 transformedEvent.recycle(); 1984 return handled; 1985 } 1986 1987 /** 1988 * Enable or disable the splitting of MotionEvents to multiple children during touch event 1989 * dispatch. This behavior is enabled by default for applications that target an 1990 * SDK version of {@link Build.VERSION_CODES#HONEYCOMB} or newer. 1991 * 1992 * <p>When this option is enabled MotionEvents may be split and dispatched to different child 1993 * views depending on where each pointer initially went down. This allows for user interactions 1994 * such as scrolling two panes of content independently, chording of buttons, and performing 1995 * independent gestures on different pieces of content. 1996 * 1997 * @param split <code>true</code> to allow MotionEvents to be split and dispatched to multiple 1998 * child views. <code>false</code> to only allow one child view to be the target of 1999 * any MotionEvent received by this ViewGroup. 2000 */ 2001 public void setMotionEventSplittingEnabled(boolean split) { 2002 // TODO Applications really shouldn't change this setting mid-touch event, 2003 // but perhaps this should handle that case and send ACTION_CANCELs to any child views 2004 // with gestures in progress when this is changed. 2005 if (split) { 2006 mGroupFlags |= FLAG_SPLIT_MOTION_EVENTS; 2007 } else { 2008 mGroupFlags &= ~FLAG_SPLIT_MOTION_EVENTS; 2009 } 2010 } 2011 2012 /** 2013 * Returns true if MotionEvents dispatched to this ViewGroup can be split to multiple children. 2014 * @return true if MotionEvents dispatched to this ViewGroup can be split to multiple children. 2015 */ 2016 public boolean isMotionEventSplittingEnabled() { 2017 return (mGroupFlags & FLAG_SPLIT_MOTION_EVENTS) == FLAG_SPLIT_MOTION_EVENTS; 2018 } 2019 2020 /** 2021 * {@inheritDoc} 2022 */ 2023 public void requestDisallowInterceptTouchEvent(boolean disallowIntercept) { 2024 2025 if (disallowIntercept == ((mGroupFlags & FLAG_DISALLOW_INTERCEPT) != 0)) { 2026 // We're already in this state, assume our ancestors are too 2027 return; 2028 } 2029 2030 if (disallowIntercept) { 2031 mGroupFlags |= FLAG_DISALLOW_INTERCEPT; 2032 } else { 2033 mGroupFlags &= ~FLAG_DISALLOW_INTERCEPT; 2034 } 2035 2036 // Pass it up to our parent 2037 if (mParent != null) { 2038 mParent.requestDisallowInterceptTouchEvent(disallowIntercept); 2039 } 2040 } 2041 2042 /** 2043 * Implement this method to intercept all touch screen motion events. This 2044 * allows you to watch events as they are dispatched to your children, and 2045 * take ownership of the current gesture at any point. 2046 * 2047 * <p>Using this function takes some care, as it has a fairly complicated 2048 * interaction with {@link View#onTouchEvent(MotionEvent) 2049 * View.onTouchEvent(MotionEvent)}, and using it requires implementing 2050 * that method as well as this one in the correct way. Events will be 2051 * received in the following order: 2052 * 2053 * <ol> 2054 * <li> You will receive the down event here. 2055 * <li> The down event will be handled either by a child of this view 2056 * group, or given to your own onTouchEvent() method to handle; this means 2057 * you should implement onTouchEvent() to return true, so you will 2058 * continue to see the rest of the gesture (instead of looking for 2059 * a parent view to handle it). Also, by returning true from 2060 * onTouchEvent(), you will not receive any following 2061 * events in onInterceptTouchEvent() and all touch processing must 2062 * happen in onTouchEvent() like normal. 2063 * <li> For as long as you return false from this function, each following 2064 * event (up to and including the final up) will be delivered first here 2065 * and then to the target's onTouchEvent(). 2066 * <li> If you return true from here, you will not receive any 2067 * following events: the target view will receive the same event but 2068 * with the action {@link MotionEvent#ACTION_CANCEL}, and all further 2069 * events will be delivered to your onTouchEvent() method and no longer 2070 * appear here. 2071 * </ol> 2072 * 2073 * @param ev The motion event being dispatched down the hierarchy. 2074 * @return Return true to steal motion events from the children and have 2075 * them dispatched to this ViewGroup through onTouchEvent(). 2076 * The current target will receive an ACTION_CANCEL event, and no further 2077 * messages will be delivered here. 2078 */ 2079 public boolean onInterceptTouchEvent(MotionEvent ev) { 2080 return false; 2081 } 2082 2083 /** 2084 * {@inheritDoc} 2085 * 2086 * Looks for a view to give focus to respecting the setting specified by 2087 * {@link #getDescendantFocusability()}. 2088 * 2089 * Uses {@link #onRequestFocusInDescendants(int, android.graphics.Rect)} to 2090 * find focus within the children of this group when appropriate. 2091 * 2092 * @see #FOCUS_BEFORE_DESCENDANTS 2093 * @see #FOCUS_AFTER_DESCENDANTS 2094 * @see #FOCUS_BLOCK_DESCENDANTS 2095 * @see #onRequestFocusInDescendants(int, android.graphics.Rect) 2096 */ 2097 @Override 2098 public boolean requestFocus(int direction, Rect previouslyFocusedRect) { 2099 if (DBG) { 2100 System.out.println(this + " ViewGroup.requestFocus direction=" 2101 + direction); 2102 } 2103 int descendantFocusability = getDescendantFocusability(); 2104 2105 switch (descendantFocusability) { 2106 case FOCUS_BLOCK_DESCENDANTS: 2107 return super.requestFocus(direction, previouslyFocusedRect); 2108 case FOCUS_BEFORE_DESCENDANTS: { 2109 final boolean took = super.requestFocus(direction, previouslyFocusedRect); 2110 return took ? took : onRequestFocusInDescendants(direction, previouslyFocusedRect); 2111 } 2112 case FOCUS_AFTER_DESCENDANTS: { 2113 final boolean took = onRequestFocusInDescendants(direction, previouslyFocusedRect); 2114 return took ? took : super.requestFocus(direction, previouslyFocusedRect); 2115 } 2116 default: 2117 throw new IllegalStateException("descendant focusability must be " 2118 + "one of FOCUS_BEFORE_DESCENDANTS, FOCUS_AFTER_DESCENDANTS, FOCUS_BLOCK_DESCENDANTS " 2119 + "but is " + descendantFocusability); 2120 } 2121 } 2122 2123 /** 2124 * Look for a descendant to call {@link View#requestFocus} on. 2125 * Called by {@link ViewGroup#requestFocus(int, android.graphics.Rect)} 2126 * when it wants to request focus within its children. Override this to 2127 * customize how your {@link ViewGroup} requests focus within its children. 2128 * @param direction One of FOCUS_UP, FOCUS_DOWN, FOCUS_LEFT, and FOCUS_RIGHT 2129 * @param previouslyFocusedRect The rectangle (in this View's coordinate system) 2130 * to give a finer grained hint about where focus is coming from. May be null 2131 * if there is no hint. 2132 * @return Whether focus was taken. 2133 */ 2134 @SuppressWarnings({"ConstantConditions"}) 2135 protected boolean onRequestFocusInDescendants(int direction, 2136 Rect previouslyFocusedRect) { 2137 int index; 2138 int increment; 2139 int end; 2140 int count = mChildrenCount; 2141 if ((direction & FOCUS_FORWARD) != 0) { 2142 index = 0; 2143 increment = 1; 2144 end = count; 2145 } else { 2146 index = count - 1; 2147 increment = -1; 2148 end = -1; 2149 } 2150 final View[] children = mChildren; 2151 for (int i = index; i != end; i += increment) { 2152 View child = children[i]; 2153 if ((child.mViewFlags & VISIBILITY_MASK) == VISIBLE) { 2154 if (child.requestFocus(direction, previouslyFocusedRect)) { 2155 return true; 2156 } 2157 } 2158 } 2159 return false; 2160 } 2161 2162 /** 2163 * {@inheritDoc} 2164 * 2165 * @hide 2166 */ 2167 @Override 2168 public void dispatchStartTemporaryDetach() { 2169 super.dispatchStartTemporaryDetach(); 2170 final int count = mChildrenCount; 2171 final View[] children = mChildren; 2172 for (int i = 0; i < count; i++) { 2173 children[i].dispatchStartTemporaryDetach(); 2174 } 2175 } 2176 2177 /** 2178 * {@inheritDoc} 2179 * 2180 * @hide 2181 */ 2182 @Override 2183 public void dispatchFinishTemporaryDetach() { 2184 super.dispatchFinishTemporaryDetach(); 2185 final int count = mChildrenCount; 2186 final View[] children = mChildren; 2187 for (int i = 0; i < count; i++) { 2188 children[i].dispatchFinishTemporaryDetach(); 2189 } 2190 } 2191 2192 /** 2193 * {@inheritDoc} 2194 */ 2195 @Override 2196 void dispatchAttachedToWindow(AttachInfo info, int visibility) { 2197 mGroupFlags |= FLAG_PREVENT_DISPATCH_ATTACHED_TO_WINDOW; 2198 super.dispatchAttachedToWindow(info, visibility); 2199 mGroupFlags &= ~FLAG_PREVENT_DISPATCH_ATTACHED_TO_WINDOW; 2200 2201 visibility |= mViewFlags & VISIBILITY_MASK; 2202 2203 final int count = mChildrenCount; 2204 final View[] children = mChildren; 2205 for (int i = 0; i < count; i++) { 2206 children[i].dispatchAttachedToWindow(info, visibility); 2207 } 2208 } 2209 2210 @Override 2211 boolean dispatchPopulateAccessibilityEventInternal(AccessibilityEvent event) { 2212 boolean handled = super.dispatchPopulateAccessibilityEventInternal(event); 2213 if (handled) { 2214 return handled; 2215 } 2216 // Let our children have a shot in populating the event. 2217 for (int i = 0, count = getChildCount(); i < count; i++) { 2218 View child = getChildAt(i); 2219 if ((child.mViewFlags & VISIBILITY_MASK) == VISIBLE) { 2220 handled = getChildAt(i).dispatchPopulateAccessibilityEvent(event); 2221 if (handled) { 2222 return handled; 2223 } 2224 } 2225 } 2226 return false; 2227 } 2228 2229 @Override 2230 void onInitializeAccessibilityNodeInfoInternal(AccessibilityNodeInfo info) { 2231 super.onInitializeAccessibilityNodeInfoInternal(info); 2232 for (int i = 0, count = mChildrenCount; i < count; i++) { 2233 View child = mChildren[i]; 2234 if ((child.mViewFlags & VISIBILITY_MASK) == VISIBLE 2235 && (child.mPrivateFlags & IS_ROOT_NAMESPACE) == 0) { 2236 info.addChild(child); 2237 } 2238 } 2239 } 2240 2241 /** 2242 * {@inheritDoc} 2243 */ 2244 @Override 2245 void dispatchDetachedFromWindow() { 2246 // If we still have a touch target, we are still in the process of 2247 // dispatching motion events to a child; we need to get rid of that 2248 // child to avoid dispatching events to it after the window is torn 2249 // down. To make sure we keep the child in a consistent state, we 2250 // first send it an ACTION_CANCEL motion event. 2251 cancelAndClearTouchTargets(null); 2252 2253 // In case view is detached while transition is running 2254 mLayoutSuppressed = false; 2255 2256 // Tear down our drag tracking 2257 mDragNotifiedChildren = null; 2258 if (mCurrentDrag != null) { 2259 mCurrentDrag.recycle(); 2260 mCurrentDrag = null; 2261 } 2262 2263 final int count = mChildrenCount; 2264 final View[] children = mChildren; 2265 for (int i = 0; i < count; i++) { 2266 children[i].dispatchDetachedFromWindow(); 2267 } 2268 super.dispatchDetachedFromWindow(); 2269 } 2270 2271 /** 2272 * {@inheritDoc} 2273 */ 2274 @Override 2275 public void setPadding(int left, int top, int right, int bottom) { 2276 super.setPadding(left, top, right, bottom); 2277 2278 if ((mPaddingLeft | mPaddingTop | mPaddingRight | mPaddingBottom) != 0) { 2279 mGroupFlags |= FLAG_PADDING_NOT_NULL; 2280 } else { 2281 mGroupFlags &= ~FLAG_PADDING_NOT_NULL; 2282 } 2283 } 2284 2285 /** 2286 * {@inheritDoc} 2287 */ 2288 @Override 2289 protected void dispatchSaveInstanceState(SparseArray<Parcelable> container) { 2290 super.dispatchSaveInstanceState(container); 2291 final int count = mChildrenCount; 2292 final View[] children = mChildren; 2293 for (int i = 0; i < count; i++) { 2294 View c = children[i]; 2295 if ((c.mViewFlags & PARENT_SAVE_DISABLED_MASK) != PARENT_SAVE_DISABLED) { 2296 c.dispatchSaveInstanceState(container); 2297 } 2298 } 2299 } 2300 2301 /** 2302 * Perform dispatching of a {@link #saveHierarchyState(android.util.SparseArray)} freeze()} 2303 * to only this view, not to its children. For use when overriding 2304 * {@link #dispatchSaveInstanceState(android.util.SparseArray)} dispatchFreeze()} to allow 2305 * subclasses to freeze their own state but not the state of their children. 2306 * 2307 * @param container the container 2308 */ 2309 protected void dispatchFreezeSelfOnly(SparseArray<Parcelable> container) { 2310 super.dispatchSaveInstanceState(container); 2311 } 2312 2313 /** 2314 * {@inheritDoc} 2315 */ 2316 @Override 2317 protected void dispatchRestoreInstanceState(SparseArray<Parcelable> container) { 2318 super.dispatchRestoreInstanceState(container); 2319 final int count = mChildrenCount; 2320 final View[] children = mChildren; 2321 for (int i = 0; i < count; i++) { 2322 View c = children[i]; 2323 if ((c.mViewFlags & PARENT_SAVE_DISABLED_MASK) != PARENT_SAVE_DISABLED) { 2324 c.dispatchRestoreInstanceState(container); 2325 } 2326 } 2327 } 2328 2329 /** 2330 * Perform dispatching of a {@link #restoreHierarchyState(android.util.SparseArray)} 2331 * to only this view, not to its children. For use when overriding 2332 * {@link #dispatchRestoreInstanceState(android.util.SparseArray)} to allow 2333 * subclasses to thaw their own state but not the state of their children. 2334 * 2335 * @param container the container 2336 */ 2337 protected void dispatchThawSelfOnly(SparseArray<Parcelable> container) { 2338 super.dispatchRestoreInstanceState(container); 2339 } 2340 2341 /** 2342 * Enables or disables the drawing cache for each child of this view group. 2343 * 2344 * @param enabled true to enable the cache, false to dispose of it 2345 */ 2346 protected void setChildrenDrawingCacheEnabled(boolean enabled) { 2347 if (enabled || (mPersistentDrawingCache & PERSISTENT_ALL_CACHES) != PERSISTENT_ALL_CACHES) { 2348 final View[] children = mChildren; 2349 final int count = mChildrenCount; 2350 for (int i = 0; i < count; i++) { 2351 children[i].setDrawingCacheEnabled(enabled); 2352 } 2353 } 2354 } 2355 2356 @Override 2357 protected void onAnimationStart() { 2358 super.onAnimationStart(); 2359 2360 // When this ViewGroup's animation starts, build the cache for the children 2361 if ((mGroupFlags & FLAG_ANIMATION_CACHE) == FLAG_ANIMATION_CACHE) { 2362 final int count = mChildrenCount; 2363 final View[] children = mChildren; 2364 final boolean buildCache = !isHardwareAccelerated(); 2365 2366 for (int i = 0; i < count; i++) { 2367 final View child = children[i]; 2368 if ((child.mViewFlags & VISIBILITY_MASK) == VISIBLE) { 2369 child.setDrawingCacheEnabled(true); 2370 if (buildCache) { 2371 child.buildDrawingCache(true); 2372 } 2373 } 2374 } 2375 2376 mGroupFlags |= FLAG_CHILDREN_DRAWN_WITH_CACHE; 2377 } 2378 } 2379 2380 @Override 2381 protected void onAnimationEnd() { 2382 super.onAnimationEnd(); 2383 2384 // When this ViewGroup's animation ends, destroy the cache of the children 2385 if ((mGroupFlags & FLAG_ANIMATION_CACHE) == FLAG_ANIMATION_CACHE) { 2386 mGroupFlags &= ~FLAG_CHILDREN_DRAWN_WITH_CACHE; 2387 2388 if ((mPersistentDrawingCache & PERSISTENT_ANIMATION_CACHE) == 0) { 2389 setChildrenDrawingCacheEnabled(false); 2390 } 2391 } 2392 } 2393 2394 @Override 2395 Bitmap createSnapshot(Bitmap.Config quality, int backgroundColor, boolean skipChildren) { 2396 int count = mChildrenCount; 2397 int[] visibilities = null; 2398 2399 if (skipChildren) { 2400 visibilities = new int[count]; 2401 for (int i = 0; i < count; i++) { 2402 View child = getChildAt(i); 2403 visibilities[i] = child.getVisibility(); 2404 if (visibilities[i] == View.VISIBLE) { 2405 child.setVisibility(INVISIBLE); 2406 } 2407 } 2408 } 2409 2410 Bitmap b = super.createSnapshot(quality, backgroundColor, skipChildren); 2411 2412 if (skipChildren) { 2413 for (int i = 0; i < count; i++) { 2414 getChildAt(i).setVisibility(visibilities[i]); 2415 } 2416 } 2417 2418 return b; 2419 } 2420 2421 /** 2422 * {@inheritDoc} 2423 */ 2424 @Override 2425 protected void dispatchDraw(Canvas canvas) { 2426 final int count = mChildrenCount; 2427 final View[] children = mChildren; 2428 int flags = mGroupFlags; 2429 2430 if ((flags & FLAG_RUN_ANIMATION) != 0 && canAnimate()) { 2431 final boolean cache = (mGroupFlags & FLAG_ANIMATION_CACHE) == FLAG_ANIMATION_CACHE; 2432 2433 final boolean buildCache = !isHardwareAccelerated(); 2434 for (int i = 0; i < count; i++) { 2435 final View child = children[i]; 2436 if ((child.mViewFlags & VISIBILITY_MASK) == VISIBLE) { 2437 final LayoutParams params = child.getLayoutParams(); 2438 attachLayoutAnimationParameters(child, params, i, count); 2439 bindLayoutAnimation(child); 2440 if (cache) { 2441 child.setDrawingCacheEnabled(true); 2442 if (buildCache) { 2443 child.buildDrawingCache(true); 2444 } 2445 } 2446 } 2447 } 2448 2449 final LayoutAnimationController controller = mLayoutAnimationController; 2450 if (controller.willOverlap()) { 2451 mGroupFlags |= FLAG_OPTIMIZE_INVALIDATE; 2452 } 2453 2454 controller.start(); 2455 2456 mGroupFlags &= ~FLAG_RUN_ANIMATION; 2457 mGroupFlags &= ~FLAG_ANIMATION_DONE; 2458 2459 if (cache) { 2460 mGroupFlags |= FLAG_CHILDREN_DRAWN_WITH_CACHE; 2461 } 2462 2463 if (mAnimationListener != null) { 2464 mAnimationListener.onAnimationStart(controller.getAnimation()); 2465 } 2466 } 2467 2468 int saveCount = 0; 2469 final boolean clipToPadding = (flags & CLIP_TO_PADDING_MASK) == CLIP_TO_PADDING_MASK; 2470 if (clipToPadding) { 2471 saveCount = canvas.save(); 2472 canvas.clipRect(mScrollX + mPaddingLeft, mScrollY + mPaddingTop, 2473 mScrollX + mRight - mLeft - mPaddingRight, 2474 mScrollY + mBottom - mTop - mPaddingBottom); 2475 2476 } 2477 2478 // We will draw our child's animation, let's reset the flag 2479 mPrivateFlags &= ~DRAW_ANIMATION; 2480 mGroupFlags &= ~FLAG_INVALIDATE_REQUIRED; 2481 2482 boolean more = false; 2483 final long drawingTime = getDrawingTime(); 2484 2485 if ((flags & FLAG_USE_CHILD_DRAWING_ORDER) == 0) { 2486 for (int i = 0; i < count; i++) { 2487 final View child = children[i]; 2488 if ((child.mViewFlags & VISIBILITY_MASK) == VISIBLE || child.getAnimation() != null) { 2489 more |= drawChild(canvas, child, drawingTime); 2490 } 2491 } 2492 } else { 2493 for (int i = 0; i < count; i++) { 2494 final View child = children[getChildDrawingOrder(count, i)]; 2495 if ((child.mViewFlags & VISIBILITY_MASK) == VISIBLE || child.getAnimation() != null) { 2496 more |= drawChild(canvas, child, drawingTime); 2497 } 2498 } 2499 } 2500 2501 // Draw any disappearing views that have animations 2502 if (mDisappearingChildren != null) { 2503 final ArrayList<View> disappearingChildren = mDisappearingChildren; 2504 final int disappearingCount = disappearingChildren.size() - 1; 2505 // Go backwards -- we may delete as animations finish 2506 for (int i = disappearingCount; i >= 0; i--) { 2507 final View child = disappearingChildren.get(i); 2508 more |= drawChild(canvas, child, drawingTime); 2509 } 2510 } 2511 2512 if (clipToPadding) { 2513 canvas.restoreToCount(saveCount); 2514 } 2515 2516 // mGroupFlags might have been updated by drawChild() 2517 flags = mGroupFlags; 2518 2519 if ((flags & FLAG_INVALIDATE_REQUIRED) == FLAG_INVALIDATE_REQUIRED) { 2520 invalidate(true); 2521 } 2522 2523 if ((flags & FLAG_ANIMATION_DONE) == 0 && (flags & FLAG_NOTIFY_ANIMATION_LISTENER) == 0 && 2524 mLayoutAnimationController.isDone() && !more) { 2525 // We want to erase the drawing cache and notify the listener after the 2526 // next frame is drawn because one extra invalidate() is caused by 2527 // drawChild() after the animation is over 2528 mGroupFlags |= FLAG_NOTIFY_ANIMATION_LISTENER; 2529 final Runnable end = new Runnable() { 2530 public void run() { 2531 notifyAnimationListener(); 2532 } 2533 }; 2534 post(end); 2535 } 2536 } 2537 2538 /** 2539 * Returns the index of the child to draw for this iteration. Override this 2540 * if you want to change the drawing order of children. By default, it 2541 * returns i. 2542 * <p> 2543 * NOTE: In order for this method to be called, you must enable child ordering 2544 * first by calling {@link #setChildrenDrawingOrderEnabled(boolean)}. 2545 * 2546 * @param i The current iteration. 2547 * @return The index of the child to draw this iteration. 2548 * 2549 * @see #setChildrenDrawingOrderEnabled(boolean) 2550 * @see #isChildrenDrawingOrderEnabled() 2551 */ 2552 protected int getChildDrawingOrder(int childCount, int i) { 2553 return i; 2554 } 2555 2556 private void notifyAnimationListener() { 2557 mGroupFlags &= ~FLAG_NOTIFY_ANIMATION_LISTENER; 2558 mGroupFlags |= FLAG_ANIMATION_DONE; 2559 2560 if (mAnimationListener != null) { 2561 final Runnable end = new Runnable() { 2562 public void run() { 2563 mAnimationListener.onAnimationEnd(mLayoutAnimationController.getAnimation()); 2564 } 2565 }; 2566 post(end); 2567 } 2568 2569 if ((mGroupFlags & FLAG_ANIMATION_CACHE) == FLAG_ANIMATION_CACHE) { 2570 mGroupFlags &= ~FLAG_CHILDREN_DRAWN_WITH_CACHE; 2571 if ((mPersistentDrawingCache & PERSISTENT_ANIMATION_CACHE) == 0) { 2572 setChildrenDrawingCacheEnabled(false); 2573 } 2574 } 2575 2576 invalidate(true); 2577 } 2578 2579 /** 2580 * This method is used to cause children of this ViewGroup to restore or recreate their 2581 * display lists. It is called by getDisplayList() when the parent ViewGroup does not need 2582 * to recreate its own display list, which would happen if it went through the normal 2583 * draw/dispatchDraw mechanisms. 2584 * 2585 * @hide 2586 */ 2587 @Override 2588 protected void dispatchGetDisplayList() { 2589 final int count = mChildrenCount; 2590 final View[] children = mChildren; 2591 for (int i = 0; i < count; i++) { 2592 final View child = children[i]; 2593 if (((child.mViewFlags & VISIBILITY_MASK) == VISIBLE || child.getAnimation() != null) && 2594 child.hasStaticLayer()) { 2595 child.mRecreateDisplayList = (child.mPrivateFlags & INVALIDATED) == INVALIDATED; 2596 child.mPrivateFlags &= ~INVALIDATED; 2597 child.getDisplayList(); 2598 child.mRecreateDisplayList = false; 2599 } 2600 } 2601 } 2602 2603 /** 2604 * Draw one child of this View Group. This method is responsible for getting 2605 * the canvas in the right state. This includes clipping, translating so 2606 * that the child's scrolled origin is at 0, 0, and applying any animation 2607 * transformations. 2608 * 2609 * @param canvas The canvas on which to draw the child 2610 * @param child Who to draw 2611 * @param drawingTime The time at which draw is occuring 2612 * @return True if an invalidate() was issued 2613 */ 2614 protected boolean drawChild(Canvas canvas, View child, long drawingTime) { 2615 boolean more = false; 2616 2617 final int cl = child.mLeft; 2618 final int ct = child.mTop; 2619 final int cr = child.mRight; 2620 final int cb = child.mBottom; 2621 2622 final boolean childHasIdentityMatrix = child.hasIdentityMatrix(); 2623 2624 final int flags = mGroupFlags; 2625 2626 if ((flags & FLAG_CLEAR_TRANSFORMATION) == FLAG_CLEAR_TRANSFORMATION) { 2627 mChildTransformation.clear(); 2628 mGroupFlags &= ~FLAG_CLEAR_TRANSFORMATION; 2629 } 2630 2631 Transformation transformToApply = null; 2632 Transformation invalidationTransform; 2633 final Animation a = child.getAnimation(); 2634 boolean concatMatrix = false; 2635 2636 boolean scalingRequired = false; 2637 boolean caching; 2638 int layerType = mDrawLayers ? child.getLayerType() : LAYER_TYPE_NONE; 2639 2640 final boolean hardwareAccelerated = canvas.isHardwareAccelerated(); 2641 if ((flags & FLAG_CHILDREN_DRAWN_WITH_CACHE) == FLAG_CHILDREN_DRAWN_WITH_CACHE || 2642 (flags & FLAG_ALWAYS_DRAWN_WITH_CACHE) == FLAG_ALWAYS_DRAWN_WITH_CACHE) { 2643 caching = true; 2644 if (mAttachInfo != null) scalingRequired = mAttachInfo.mScalingRequired; 2645 } else { 2646 caching = (layerType != LAYER_TYPE_NONE) || hardwareAccelerated; 2647 } 2648 2649 if (a != null) { 2650 final boolean initialized = a.isInitialized(); 2651 if (!initialized) { 2652 a.initialize(cr - cl, cb - ct, getWidth(), getHeight()); 2653 a.initializeInvalidateRegion(0, 0, cr - cl, cb - ct); 2654 child.onAnimationStart(); 2655 } 2656 2657 more = a.getTransformation(drawingTime, mChildTransformation, 2658 scalingRequired ? mAttachInfo.mApplicationScale : 1f); 2659 if (scalingRequired && mAttachInfo.mApplicationScale != 1f) { 2660 if (mInvalidationTransformation == null) { 2661 mInvalidationTransformation = new Transformation(); 2662 } 2663 invalidationTransform = mInvalidationTransformation; 2664 a.getTransformation(drawingTime, invalidationTransform, 1f); 2665 } else { 2666 invalidationTransform = mChildTransformation; 2667 } 2668 transformToApply = mChildTransformation; 2669 2670 concatMatrix = a.willChangeTransformationMatrix(); 2671 2672 if (more) { 2673 if (!a.willChangeBounds()) { 2674 if ((flags & (FLAG_OPTIMIZE_INVALIDATE | FLAG_ANIMATION_DONE)) == 2675 FLAG_OPTIMIZE_INVALIDATE) { 2676 mGroupFlags |= FLAG_INVALIDATE_REQUIRED; 2677 } else if ((flags & FLAG_INVALIDATE_REQUIRED) == 0) { 2678 // The child need to draw an animation, potentially offscreen, so 2679 // make sure we do not cancel invalidate requests 2680 mPrivateFlags |= DRAW_ANIMATION; 2681 invalidate(cl, ct, cr, cb); 2682 } 2683 } else { 2684 if (mInvalidateRegion == null) { 2685 mInvalidateRegion = new RectF(); 2686 } 2687 final RectF region = mInvalidateRegion; 2688 a.getInvalidateRegion(0, 0, cr - cl, cb - ct, region, invalidationTransform); 2689 2690 // The child need to draw an animation, potentially offscreen, so 2691 // make sure we do not cancel invalidate requests 2692 mPrivateFlags |= DRAW_ANIMATION; 2693 2694 final int left = cl + (int) region.left; 2695 final int top = ct + (int) region.top; 2696 invalidate(left, top, left + (int) (region.width() + .5f), 2697 top + (int) (region.height() + .5f)); 2698 } 2699 } 2700 } else if ((flags & FLAG_SUPPORT_STATIC_TRANSFORMATIONS) == 2701 FLAG_SUPPORT_STATIC_TRANSFORMATIONS) { 2702 final boolean hasTransform = getChildStaticTransformation(child, mChildTransformation); 2703 if (hasTransform) { 2704 final int transformType = mChildTransformation.getTransformationType(); 2705 transformToApply = transformType != Transformation.TYPE_IDENTITY ? 2706 mChildTransformation : null; 2707 concatMatrix = (transformType & Transformation.TYPE_MATRIX) != 0; 2708 } 2709 } 2710 2711 concatMatrix |= !childHasIdentityMatrix; 2712 2713 // Sets the flag as early as possible to allow draw() implementations 2714 // to call invalidate() successfully when doing animations 2715 child.mPrivateFlags |= DRAWN; 2716 2717 if (!concatMatrix && canvas.quickReject(cl, ct, cr, cb, Canvas.EdgeType.BW) && 2718 (child.mPrivateFlags & DRAW_ANIMATION) == 0) { 2719 return more; 2720 } 2721 2722 if (hardwareAccelerated) { 2723 // Clear INVALIDATED flag to allow invalidation to occur during rendering, but 2724 // retain the flag's value temporarily in the mRecreateDisplayList flag 2725 child.mRecreateDisplayList = (child.mPrivateFlags & INVALIDATED) == INVALIDATED; 2726 child.mPrivateFlags &= ~INVALIDATED; 2727 } 2728 2729 child.computeScroll(); 2730 2731 final int sx = child.mScrollX; 2732 final int sy = child.mScrollY; 2733 2734 DisplayList displayList = null; 2735 Bitmap cache = null; 2736 boolean hasDisplayList = false; 2737 if (caching) { 2738 if (!hardwareAccelerated) { 2739 if (layerType != LAYER_TYPE_NONE) { 2740 layerType = LAYER_TYPE_SOFTWARE; 2741 child.buildDrawingCache(true); 2742 } 2743 cache = child.getDrawingCache(true); 2744 } else { 2745 switch (layerType) { 2746 case LAYER_TYPE_SOFTWARE: 2747 child.buildDrawingCache(true); 2748 cache = child.getDrawingCache(true); 2749 break; 2750 case LAYER_TYPE_NONE: 2751 // Delay getting the display list until animation-driven alpha values are 2752 // set up and possibly passed on to the view 2753 hasDisplayList = child.canHaveDisplayList(); 2754 break; 2755 } 2756 } 2757 } 2758 2759 final boolean hasNoCache = cache == null || hasDisplayList; 2760 final boolean offsetForScroll = cache == null && !hasDisplayList && 2761 layerType != LAYER_TYPE_HARDWARE; 2762 2763 final int restoreTo = canvas.save(); 2764 if (offsetForScroll) { 2765 canvas.translate(cl - sx, ct - sy); 2766 } else { 2767 canvas.translate(cl, ct); 2768 if (scalingRequired) { 2769 // mAttachInfo cannot be null, otherwise scalingRequired == false 2770 final float scale = 1.0f / mAttachInfo.mApplicationScale; 2771 canvas.scale(scale, scale); 2772 } 2773 } 2774 2775 float alpha = child.getAlpha(); 2776 if (transformToApply != null || alpha < 1.0f || !child.hasIdentityMatrix()) { 2777 if (transformToApply != null || !childHasIdentityMatrix) { 2778 int transX = 0; 2779 int transY = 0; 2780 2781 if (offsetForScroll) { 2782 transX = -sx; 2783 transY = -sy; 2784 } 2785 2786 if (transformToApply != null) { 2787 if (concatMatrix) { 2788 // Undo the scroll translation, apply the transformation matrix, 2789 // then redo the scroll translate to get the correct result. 2790 canvas.translate(-transX, -transY); 2791 canvas.concat(transformToApply.getMatrix()); 2792 canvas.translate(transX, transY); 2793 mGroupFlags |= FLAG_CLEAR_TRANSFORMATION; 2794 } 2795 2796 float transformAlpha = transformToApply.getAlpha(); 2797 if (transformAlpha < 1.0f) { 2798 alpha *= transformToApply.getAlpha(); 2799 mGroupFlags |= FLAG_CLEAR_TRANSFORMATION; 2800 } 2801 } 2802 2803 if (!childHasIdentityMatrix) { 2804 canvas.translate(-transX, -transY); 2805 canvas.concat(child.getMatrix()); 2806 canvas.translate(transX, transY); 2807 } 2808 } 2809 2810 if (alpha < 1.0f) { 2811 mGroupFlags |= FLAG_CLEAR_TRANSFORMATION; 2812 if (hasNoCache) { 2813 final int multipliedAlpha = (int) (255 * alpha); 2814 if (!child.onSetAlpha(multipliedAlpha)) { 2815 int layerFlags = Canvas.HAS_ALPHA_LAYER_SAVE_FLAG; 2816 if ((flags & FLAG_CLIP_CHILDREN) == FLAG_CLIP_CHILDREN || 2817 layerType != LAYER_TYPE_NONE) { 2818 layerFlags |= Canvas.CLIP_TO_LAYER_SAVE_FLAG; 2819 } 2820 if (layerType == LAYER_TYPE_NONE) { 2821 final int scrollX = hasDisplayList ? 0 : sx; 2822 final int scrollY = hasDisplayList ? 0 : sy; 2823 canvas.saveLayerAlpha(scrollX, scrollY, scrollX + cr - cl, 2824 scrollY + cb - ct, multipliedAlpha, layerFlags); 2825 } 2826 } else { 2827 // Alpha is handled by the child directly, clobber the layer's alpha 2828 child.mPrivateFlags |= ALPHA_SET; 2829 } 2830 } 2831 } 2832 } else if ((child.mPrivateFlags & ALPHA_SET) == ALPHA_SET) { 2833 child.onSetAlpha(255); 2834 child.mPrivateFlags &= ~ALPHA_SET; 2835 } 2836 2837 if ((flags & FLAG_CLIP_CHILDREN) == FLAG_CLIP_CHILDREN) { 2838 if (offsetForScroll) { 2839 canvas.clipRect(sx, sy, sx + (cr - cl), sy + (cb - ct)); 2840 } else { 2841 if (!scalingRequired || cache == null) { 2842 canvas.clipRect(0, 0, cr - cl, cb - ct); 2843 } else { 2844 canvas.clipRect(0, 0, cache.getWidth(), cache.getHeight()); 2845 } 2846 } 2847 } 2848 2849 if (hasDisplayList) { 2850 displayList = child.getDisplayList(); 2851 if (!displayList.isValid()) { 2852 // Uncommon, but possible. If a view is removed from the hierarchy during the call 2853 // to getDisplayList(), the display list will be marked invalid and we should not 2854 // try to use it again. 2855 displayList = null; 2856 hasDisplayList = false; 2857 } 2858 } 2859 2860 if (hasNoCache) { 2861 boolean layerRendered = false; 2862 if (layerType == LAYER_TYPE_HARDWARE) { 2863 final HardwareLayer layer = child.getHardwareLayer(); 2864 if (layer != null && layer.isValid()) { 2865 child.mLayerPaint.setAlpha((int) (alpha * 255)); 2866 ((HardwareCanvas) canvas).drawHardwareLayer(layer, 0, 0, child.mLayerPaint); 2867 layerRendered = true; 2868 } else { 2869 final int scrollX = hasDisplayList ? 0 : sx; 2870 final int scrollY = hasDisplayList ? 0 : sy; 2871 canvas.saveLayer(scrollX, scrollY, 2872 scrollX + cr - cl, scrollY + cb - ct, child.mLayerPaint, 2873 Canvas.HAS_ALPHA_LAYER_SAVE_FLAG | Canvas.CLIP_TO_LAYER_SAVE_FLAG); 2874 } 2875 } 2876 2877 if (!layerRendered) { 2878 if (!hasDisplayList) { 2879 // Fast path for layouts with no backgrounds 2880 if ((child.mPrivateFlags & SKIP_DRAW) == SKIP_DRAW) { 2881 if (ViewDebug.TRACE_HIERARCHY) { 2882 ViewDebug.trace(this, ViewDebug.HierarchyTraceType.DRAW); 2883 } 2884 child.mPrivateFlags &= ~DIRTY_MASK; 2885 child.dispatchDraw(canvas); 2886 } else { 2887 child.draw(canvas); 2888 } 2889 } else { 2890 child.mPrivateFlags &= ~DIRTY_MASK; 2891 ((HardwareCanvas) canvas).drawDisplayList(displayList, cr - cl, cb - ct, null); 2892 } 2893 } 2894 } else if (cache != null) { 2895 child.mPrivateFlags &= ~DIRTY_MASK; 2896 Paint cachePaint; 2897 2898 if (layerType == LAYER_TYPE_NONE) { 2899 cachePaint = mCachePaint; 2900 if (cachePaint == null) { 2901 cachePaint = new Paint(); 2902 cachePaint.setDither(false); 2903 mCachePaint = cachePaint; 2904 } 2905 if (alpha < 1.0f) { 2906 cachePaint.setAlpha((int) (alpha * 255)); 2907 mGroupFlags |= FLAG_ALPHA_LOWER_THAN_ONE; 2908 } else if ((flags & FLAG_ALPHA_LOWER_THAN_ONE) == FLAG_ALPHA_LOWER_THAN_ONE) { 2909 cachePaint.setAlpha(255); 2910 mGroupFlags &= ~FLAG_ALPHA_LOWER_THAN_ONE; 2911 } 2912 } else { 2913 cachePaint = child.mLayerPaint; 2914 cachePaint.setAlpha((int) (alpha * 255)); 2915 } 2916 canvas.drawBitmap(cache, 0.0f, 0.0f, cachePaint); 2917 } 2918 2919 canvas.restoreToCount(restoreTo); 2920 2921 if (a != null && !more) { 2922 if (!hardwareAccelerated && !a.getFillAfter()) { 2923 child.onSetAlpha(255); 2924 } 2925 finishAnimatingView(child, a); 2926 } 2927 2928 if (more && hardwareAccelerated) { 2929 // invalidation is the trigger to recreate display lists, so if we're using 2930 // display lists to render, force an invalidate to allow the animation to 2931 // continue drawing another frame 2932 invalidate(true); 2933 if (a.hasAlpha() && (child.mPrivateFlags & ALPHA_SET) == ALPHA_SET) { 2934 // alpha animations should cause the child to recreate its display list 2935 child.invalidate(true); 2936 } 2937 } 2938 2939 child.mRecreateDisplayList = false; 2940 2941 return more; 2942 } 2943 2944 /** 2945 * 2946 * @param enabled True if children should be drawn with layers, false otherwise. 2947 * 2948 * @hide 2949 */ 2950 public void setChildrenLayersEnabled(boolean enabled) { 2951 if (enabled != mDrawLayers) { 2952 mDrawLayers = enabled; 2953 invalidate(true); 2954 2955 // We need to invalidate any child with a layer. For instance, 2956 // if a child is backed by a hardware layer and we disable layers 2957 // the child is marked as not dirty (flags cleared the last time 2958 // the child was drawn inside its layer.) However, that child might 2959 // never have created its own display list or have an obsolete 2960 // display list. By invalidating the child we ensure the display 2961 // list is in sync with the content of the hardware layer. 2962 for (int i = 0; i < mChildrenCount; i++) { 2963 View child = mChildren[i]; 2964 if (child.mLayerType != LAYER_TYPE_NONE) { 2965 child.invalidate(true); 2966 } 2967 } 2968 } 2969 } 2970 2971 /** 2972 * By default, children are clipped to their bounds before drawing. This 2973 * allows view groups to override this behavior for animations, etc. 2974 * 2975 * @param clipChildren true to clip children to their bounds, 2976 * false otherwise 2977 * @attr ref android.R.styleable#ViewGroup_clipChildren 2978 */ 2979 public void setClipChildren(boolean clipChildren) { 2980 setBooleanFlag(FLAG_CLIP_CHILDREN, clipChildren); 2981 } 2982 2983 /** 2984 * By default, children are clipped to the padding of the ViewGroup. This 2985 * allows view groups to override this behavior 2986 * 2987 * @param clipToPadding true to clip children to the padding of the 2988 * group, false otherwise 2989 * @attr ref android.R.styleable#ViewGroup_clipToPadding 2990 */ 2991 public void setClipToPadding(boolean clipToPadding) { 2992 setBooleanFlag(FLAG_CLIP_TO_PADDING, clipToPadding); 2993 } 2994 2995 /** 2996 * {@inheritDoc} 2997 */ 2998 @Override 2999 public void dispatchSetSelected(boolean selected) { 3000 final View[] children = mChildren; 3001 final int count = mChildrenCount; 3002 for (int i = 0; i < count; i++) { 3003 children[i].setSelected(selected); 3004 } 3005 } 3006 3007 /** 3008 * {@inheritDoc} 3009 */ 3010 @Override 3011 public void dispatchSetActivated(boolean activated) { 3012 final View[] children = mChildren; 3013 final int count = mChildrenCount; 3014 for (int i = 0; i < count; i++) { 3015 children[i].setActivated(activated); 3016 } 3017 } 3018 3019 @Override 3020 protected void dispatchSetPressed(boolean pressed) { 3021 final View[] children = mChildren; 3022 final int count = mChildrenCount; 3023 for (int i = 0; i < count; i++) { 3024 children[i].setPressed(pressed); 3025 } 3026 } 3027 3028 /** 3029 * When this property is set to true, this ViewGroup supports static transformations on 3030 * children; this causes 3031 * {@link #getChildStaticTransformation(View, android.view.animation.Transformation)} to be 3032 * invoked when a child is drawn. 3033 * 3034 * Any subclass overriding 3035 * {@link #getChildStaticTransformation(View, android.view.animation.Transformation)} should 3036 * set this property to true. 3037 * 3038 * @param enabled True to enable static transformations on children, false otherwise. 3039 * 3040 * @see #FLAG_SUPPORT_STATIC_TRANSFORMATIONS 3041 */ 3042 protected void setStaticTransformationsEnabled(boolean enabled) { 3043 setBooleanFlag(FLAG_SUPPORT_STATIC_TRANSFORMATIONS, enabled); 3044 } 3045 3046 /** 3047 * {@inheritDoc} 3048 * 3049 * @see #setStaticTransformationsEnabled(boolean) 3050 */ 3051 protected boolean getChildStaticTransformation(View child, Transformation t) { 3052 return false; 3053 } 3054 3055 /** 3056 * {@hide} 3057 */ 3058 @Override 3059 protected View findViewTraversal(int id) { 3060 if (id == mID) { 3061 return this; 3062 } 3063 3064 final View[] where = mChildren; 3065 final int len = mChildrenCount; 3066 3067 for (int i = 0; i < len; i++) { 3068 View v = where[i]; 3069 3070 if ((v.mPrivateFlags & IS_ROOT_NAMESPACE) == 0) { 3071 v = v.findViewById(id); 3072 3073 if (v != null) { 3074 return v; 3075 } 3076 } 3077 } 3078 3079 return null; 3080 } 3081 3082 /** 3083 * {@hide} 3084 */ 3085 @Override 3086 protected View findViewWithTagTraversal(Object tag) { 3087 if (tag != null && tag.equals(mTag)) { 3088 return this; 3089 } 3090 3091 final View[] where = mChildren; 3092 final int len = mChildrenCount; 3093 3094 for (int i = 0; i < len; i++) { 3095 View v = where[i]; 3096 3097 if ((v.mPrivateFlags & IS_ROOT_NAMESPACE) == 0) { 3098 v = v.findViewWithTag(tag); 3099 3100 if (v != null) { 3101 return v; 3102 } 3103 } 3104 } 3105 3106 return null; 3107 } 3108 3109 /** 3110 * {@hide} 3111 */ 3112 @Override 3113 protected View findViewByPredicateTraversal(Predicate<View> predicate, View childToSkip) { 3114 if (predicate.apply(this)) { 3115 return this; 3116 } 3117 3118 final View[] where = mChildren; 3119 final int len = mChildrenCount; 3120 3121 for (int i = 0; i < len; i++) { 3122 View v = where[i]; 3123 3124 if (v != childToSkip && (v.mPrivateFlags & IS_ROOT_NAMESPACE) == 0) { 3125 v = v.findViewByPredicate(predicate); 3126 3127 if (v != null) { 3128 return v; 3129 } 3130 } 3131 } 3132 3133 return null; 3134 } 3135 3136 /** 3137 * Adds a child view. If no layout parameters are already set on the child, the 3138 * default parameters for this ViewGroup are set on the child. 3139 * 3140 * @param child the child view to add 3141 * 3142 * @see #generateDefaultLayoutParams() 3143 */ 3144 public void addView(View child) { 3145 addView(child, -1); 3146 } 3147 3148 /** 3149 * Adds a child view. If no layout parameters are already set on the child, the 3150 * default parameters for this ViewGroup are set on the child. 3151 * 3152 * @param child the child view to add 3153 * @param index the position at which to add the child 3154 * 3155 * @see #generateDefaultLayoutParams() 3156 */ 3157 public void addView(View child, int index) { 3158 LayoutParams params = child.getLayoutParams(); 3159 if (params == null) { 3160 params = generateDefaultLayoutParams(); 3161 if (params == null) { 3162 throw new IllegalArgumentException("generateDefaultLayoutParams() cannot return null"); 3163 } 3164 } 3165 addView(child, index, params); 3166 } 3167 3168 /** 3169 * Adds a child view with this ViewGroup's default layout parameters and the 3170 * specified width and height. 3171 * 3172 * @param child the child view to add 3173 */ 3174 public void addView(View child, int width, int height) { 3175 final LayoutParams params = generateDefaultLayoutParams(); 3176 params.width = width; 3177 params.height = height; 3178 addView(child, -1, params); 3179 } 3180 3181 /** 3182 * Adds a child view with the specified layout parameters. 3183 * 3184 * @param child the child view to add 3185 * @param params the layout parameters to set on the child 3186 */ 3187 public void addView(View child, LayoutParams params) { 3188 addView(child, -1, params); 3189 } 3190 3191 /** 3192 * Adds a child view with the specified layout parameters. 3193 * 3194 * @param child the child view to add 3195 * @param index the position at which to add the child 3196 * @param params the layout parameters to set on the child 3197 */ 3198 public void addView(View child, int index, LayoutParams params) { 3199 if (DBG) { 3200 System.out.println(this + " addView"); 3201 } 3202 3203 // addViewInner() will call child.requestLayout() when setting the new LayoutParams 3204 // therefore, we call requestLayout() on ourselves before, so that the child's request 3205 // will be blocked at our level 3206 requestLayout(); 3207 invalidate(true); 3208 addViewInner(child, index, params, false); 3209 } 3210 3211 /** 3212 * {@inheritDoc} 3213 */ 3214 public void updateViewLayout(View view, ViewGroup.LayoutParams params) { 3215 if (!checkLayoutParams(params)) { 3216 throw new IllegalArgumentException("Invalid LayoutParams supplied to " + this); 3217 } 3218 if (view.mParent != this) { 3219 throw new IllegalArgumentException("Given view not a child of " + this); 3220 } 3221 view.setLayoutParams(params); 3222 } 3223 3224 /** 3225 * {@inheritDoc} 3226 */ 3227 protected boolean checkLayoutParams(ViewGroup.LayoutParams p) { 3228 return p != null; 3229 } 3230 3231 /** 3232 * Interface definition for a callback to be invoked when the hierarchy 3233 * within this view changed. The hierarchy changes whenever a child is added 3234 * to or removed from this view. 3235 */ 3236 public interface OnHierarchyChangeListener { 3237 /** 3238 * Called when a new child is added to a parent view. 3239 * 3240 * @param parent the view in which a child was added 3241 * @param child the new child view added in the hierarchy 3242 */ 3243 void onChildViewAdded(View parent, View child); 3244 3245 /** 3246 * Called when a child is removed from a parent view. 3247 * 3248 * @param parent the view from which the child was removed 3249 * @param child the child removed from the hierarchy 3250 */ 3251 void onChildViewRemoved(View parent, View child); 3252 } 3253 3254 /** 3255 * Register a callback to be invoked when a child is added to or removed 3256 * from this view. 3257 * 3258 * @param listener the callback to invoke on hierarchy change 3259 */ 3260 public void setOnHierarchyChangeListener(OnHierarchyChangeListener listener) { 3261 mOnHierarchyChangeListener = listener; 3262 } 3263 3264 /** 3265 * @hide 3266 */ 3267 protected void onViewAdded(View child) { 3268 if (mOnHierarchyChangeListener != null) { 3269 mOnHierarchyChangeListener.onChildViewAdded(this, child); 3270 } 3271 } 3272 3273 /** 3274 * @hide 3275 */ 3276 protected void onViewRemoved(View child) { 3277 if (mOnHierarchyChangeListener != null) { 3278 mOnHierarchyChangeListener.onChildViewRemoved(this, child); 3279 } 3280 } 3281 3282 /** 3283 * Adds a view during layout. This is useful if in your onLayout() method, 3284 * you need to add more views (as does the list view for example). 3285 * 3286 * If index is negative, it means put it at the end of the list. 3287 * 3288 * @param child the view to add to the group 3289 * @param index the index at which the child must be added 3290 * @param params the layout parameters to associate with the child 3291 * @return true if the child was added, false otherwise 3292 */ 3293 protected boolean addViewInLayout(View child, int index, LayoutParams params) { 3294 return addViewInLayout(child, index, params, false); 3295 } 3296 3297 /** 3298 * Adds a view during layout. This is useful if in your onLayout() method, 3299 * you need to add more views (as does the list view for example). 3300 * 3301 * If index is negative, it means put it at the end of the list. 3302 * 3303 * @param child the view to add to the group 3304 * @param index the index at which the child must be added 3305 * @param params the layout parameters to associate with the child 3306 * @param preventRequestLayout if true, calling this method will not trigger a 3307 * layout request on child 3308 * @return true if the child was added, false otherwise 3309 */ 3310 protected boolean addViewInLayout(View child, int index, LayoutParams params, 3311 boolean preventRequestLayout) { 3312 child.mParent = null; 3313 addViewInner(child, index, params, preventRequestLayout); 3314 child.mPrivateFlags = (child.mPrivateFlags & ~DIRTY_MASK) | DRAWN; 3315 return true; 3316 } 3317 3318 /** 3319 * Prevents the specified child to be laid out during the next layout pass. 3320 * 3321 * @param child the child on which to perform the cleanup 3322 */ 3323 protected void cleanupLayoutState(View child) { 3324 child.mPrivateFlags &= ~View.FORCE_LAYOUT; 3325 } 3326 3327 private void addViewInner(View child, int index, LayoutParams params, 3328 boolean preventRequestLayout) { 3329 3330 if (mTransition != null) { 3331 // Don't prevent other add transitions from completing, but cancel remove 3332 // transitions to let them complete the process before we add to the container 3333 mTransition.cancel(LayoutTransition.DISAPPEARING); 3334 } 3335 3336 if (child.getParent() != null) { 3337 throw new IllegalStateException("The specified child already has a parent. " + 3338 "You must call removeView() on the child's parent first."); 3339 } 3340 3341 if (mTransition != null) { 3342 mTransition.addChild(this, child); 3343 } 3344 3345 if (!checkLayoutParams(params)) { 3346 params = generateLayoutParams(params); 3347 } 3348 3349 if (preventRequestLayout) { 3350 child.mLayoutParams = params; 3351 } else { 3352 child.setLayoutParams(params); 3353 } 3354 3355 if (index < 0) { 3356 index = mChildrenCount; 3357 } 3358 3359 addInArray(child, index); 3360 3361 // tell our children 3362 if (preventRequestLayout) { 3363 child.assignParent(this); 3364 } else { 3365 child.mParent = this; 3366 } 3367 3368 if (child.hasFocus()) { 3369 requestChildFocus(child, child.findFocus()); 3370 } 3371 3372 AttachInfo ai = mAttachInfo; 3373 if (ai != null && (mGroupFlags & FLAG_PREVENT_DISPATCH_ATTACHED_TO_WINDOW) == 0) { 3374 boolean lastKeepOn = ai.mKeepScreenOn; 3375 ai.mKeepScreenOn = false; 3376 child.dispatchAttachedToWindow(mAttachInfo, (mViewFlags&VISIBILITY_MASK)); 3377 if (ai.mKeepScreenOn) { 3378 needGlobalAttributesUpdate(true); 3379 } 3380 ai.mKeepScreenOn = lastKeepOn; 3381 } 3382 3383 onViewAdded(child); 3384 3385 if ((child.mViewFlags & DUPLICATE_PARENT_STATE) == DUPLICATE_PARENT_STATE) { 3386 mGroupFlags |= FLAG_NOTIFY_CHILDREN_ON_DRAWABLE_STATE_CHANGE; 3387 } 3388 } 3389 3390 private void addInArray(View child, int index) { 3391 View[] children = mChildren; 3392 final int count = mChildrenCount; 3393 final int size = children.length; 3394 if (index == count) { 3395 if (size == count) { 3396 mChildren = new View[size + ARRAY_CAPACITY_INCREMENT]; 3397 System.arraycopy(children, 0, mChildren, 0, size); 3398 children = mChildren; 3399 } 3400 children[mChildrenCount++] = child; 3401 } else if (index < count) { 3402 if (size == count) { 3403 mChildren = new View[size + ARRAY_CAPACITY_INCREMENT]; 3404 System.arraycopy(children, 0, mChildren, 0, index); 3405 System.arraycopy(children, index, mChildren, index + 1, count - index); 3406 children = mChildren; 3407 } else { 3408 System.arraycopy(children, index, children, index + 1, count - index); 3409 } 3410 children[index] = child; 3411 mChildrenCount++; 3412 if (mLastTouchDownIndex >= index) { 3413 mLastTouchDownIndex++; 3414 } 3415 } else { 3416 throw new IndexOutOfBoundsException("index=" + index + " count=" + count); 3417 } 3418 } 3419 3420 // This method also sets the child's mParent to null 3421 private void removeFromArray(int index) { 3422 final View[] children = mChildren; 3423 if (!(mTransitioningViews != null && mTransitioningViews.contains(children[index]))) { 3424 children[index].mParent = null; 3425 } 3426 final int count = mChildrenCount; 3427 if (index == count - 1) { 3428 children[--mChildrenCount] = null; 3429 } else if (index >= 0 && index < count) { 3430 System.arraycopy(children, index + 1, children, index, count - index - 1); 3431 children[--mChildrenCount] = null; 3432 } else { 3433 throw new IndexOutOfBoundsException(); 3434 } 3435 if (mLastTouchDownIndex == index) { 3436 mLastTouchDownTime = 0; 3437 mLastTouchDownIndex = -1; 3438 } else if (mLastTouchDownIndex > index) { 3439 mLastTouchDownIndex--; 3440 } 3441 } 3442 3443 // This method also sets the children's mParent to null 3444 private void removeFromArray(int start, int count) { 3445 final View[] children = mChildren; 3446 final int childrenCount = mChildrenCount; 3447 3448 start = Math.max(0, start); 3449 final int end = Math.min(childrenCount, start + count); 3450 3451 if (start == end) { 3452 return; 3453 } 3454 3455 if (end == childrenCount) { 3456 for (int i = start; i < end; i++) { 3457 children[i].mParent = null; 3458 children[i] = null; 3459 } 3460 } else { 3461 for (int i = start; i < end; i++) { 3462 children[i].mParent = null; 3463 } 3464 3465 // Since we're looping above, we might as well do the copy, but is arraycopy() 3466 // faster than the extra 2 bounds checks we would do in the loop? 3467 System.arraycopy(children, end, children, start, childrenCount - end); 3468 3469 for (int i = childrenCount - (end - start); i < childrenCount; i++) { 3470 children[i] = null; 3471 } 3472 } 3473 3474 mChildrenCount -= (end - start); 3475 } 3476 3477 private void bindLayoutAnimation(View child) { 3478 Animation a = mLayoutAnimationController.getAnimationForView(child); 3479 child.setAnimation(a); 3480 } 3481 3482 /** 3483 * Subclasses should override this method to set layout animation 3484 * parameters on the supplied child. 3485 * 3486 * @param child the child to associate with animation parameters 3487 * @param params the child's layout parameters which hold the animation 3488 * parameters 3489 * @param index the index of the child in the view group 3490 * @param count the number of children in the view group 3491 */ 3492 protected void attachLayoutAnimationParameters(View child, 3493 LayoutParams params, int index, int count) { 3494 LayoutAnimationController.AnimationParameters animationParams = 3495 params.layoutAnimationParameters; 3496 if (animationParams == null) { 3497 animationParams = new LayoutAnimationController.AnimationParameters(); 3498 params.layoutAnimationParameters = animationParams; 3499 } 3500 3501 animationParams.count = count; 3502 animationParams.index = index; 3503 } 3504 3505 /** 3506 * {@inheritDoc} 3507 */ 3508 public void removeView(View view) { 3509 removeViewInternal(view); 3510 requestLayout(); 3511 invalidate(true); 3512 } 3513 3514 /** 3515 * Removes a view during layout. This is useful if in your onLayout() method, 3516 * you need to remove more views. 3517 * 3518 * @param view the view to remove from the group 3519 */ 3520 public void removeViewInLayout(View view) { 3521 removeViewInternal(view); 3522 } 3523 3524 /** 3525 * Removes a range of views during layout. This is useful if in your onLayout() method, 3526 * you need to remove more views. 3527 * 3528 * @param start the index of the first view to remove from the group 3529 * @param count the number of views to remove from the group 3530 */ 3531 public void removeViewsInLayout(int start, int count) { 3532 removeViewsInternal(start, count); 3533 } 3534 3535 /** 3536 * Removes the view at the specified position in the group. 3537 * 3538 * @param index the position in the group of the view to remove 3539 */ 3540 public void removeViewAt(int index) { 3541 removeViewInternal(index, getChildAt(index)); 3542 requestLayout(); 3543 invalidate(true); 3544 } 3545 3546 /** 3547 * Removes the specified range of views from the group. 3548 * 3549 * @param start the first position in the group of the range of views to remove 3550 * @param count the number of views to remove 3551 */ 3552 public void removeViews(int start, int count) { 3553 removeViewsInternal(start, count); 3554 requestLayout(); 3555 invalidate(true); 3556 } 3557 3558 private void removeViewInternal(View view) { 3559 final int index = indexOfChild(view); 3560 if (index >= 0) { 3561 removeViewInternal(index, view); 3562 } 3563 } 3564 3565 private void removeViewInternal(int index, View view) { 3566 3567 if (mTransition != null) { 3568 mTransition.removeChild(this, view); 3569 } 3570 3571 boolean clearChildFocus = false; 3572 if (view == mFocused) { 3573 view.clearFocusForRemoval(); 3574 clearChildFocus = true; 3575 } 3576 3577 if (view.getAnimation() != null || 3578 (mTransitioningViews != null && mTransitioningViews.contains(view))) { 3579 addDisappearingView(view); 3580 } else if (view.mAttachInfo != null) { 3581 view.dispatchDetachedFromWindow(); 3582 } 3583 3584 onViewRemoved(view); 3585 3586 needGlobalAttributesUpdate(false); 3587 3588 removeFromArray(index); 3589 3590 if (clearChildFocus) { 3591 clearChildFocus(view); 3592 } 3593 } 3594 3595 /** 3596 * Sets the LayoutTransition object for this ViewGroup. If the LayoutTransition object is 3597 * not null, changes in layout which occur because of children being added to or removed from 3598 * the ViewGroup will be animated according to the animations defined in that LayoutTransition 3599 * object. By default, the transition object is null (so layout changes are not animated). 3600 * 3601 * @param transition The LayoutTransition object that will animated changes in layout. A value 3602 * of <code>null</code> means no transition will run on layout changes. 3603 * @attr ref android.R.styleable#ViewGroup_animateLayoutChanges 3604 */ 3605 public void setLayoutTransition(LayoutTransition transition) { 3606 if (mTransition != null) { 3607 mTransition.removeTransitionListener(mLayoutTransitionListener); 3608 } 3609 mTransition = transition; 3610 if (mTransition != null) { 3611 mTransition.addTransitionListener(mLayoutTransitionListener); 3612 } 3613 } 3614 3615 /** 3616 * Gets the LayoutTransition object for this ViewGroup. If the LayoutTransition object is 3617 * not null, changes in layout which occur because of children being added to or removed from 3618 * the ViewGroup will be animated according to the animations defined in that LayoutTransition 3619 * object. By default, the transition object is null (so layout changes are not animated). 3620 * 3621 * @return LayoutTranstion The LayoutTransition object that will animated changes in layout. 3622 * A value of <code>null</code> means no transition will run on layout changes. 3623 */ 3624 public LayoutTransition getLayoutTransition() { 3625 return mTransition; 3626 } 3627 3628 private void removeViewsInternal(int start, int count) { 3629 final View focused = mFocused; 3630 final boolean detach = mAttachInfo != null; 3631 View clearChildFocus = null; 3632 3633 final View[] children = mChildren; 3634 final int end = start + count; 3635 3636 for (int i = start; i < end; i++) { 3637 final View view = children[i]; 3638 3639 if (mTransition != null) { 3640 mTransition.removeChild(this, view); 3641 } 3642 3643 if (view == focused) { 3644 view.clearFocusForRemoval(); 3645 clearChildFocus = view; 3646 } 3647 3648 if (view.getAnimation() != null || 3649 (mTransitioningViews != null && mTransitioningViews.contains(view))) { 3650 addDisappearingView(view); 3651 } else if (detach) { 3652 view.dispatchDetachedFromWindow(); 3653 } 3654 3655 needGlobalAttributesUpdate(false); 3656 3657 onViewRemoved(view); 3658 } 3659 3660 removeFromArray(start, count); 3661 3662 if (clearChildFocus != null) { 3663 clearChildFocus(clearChildFocus); 3664 } 3665 } 3666 3667 /** 3668 * Call this method to remove all child views from the 3669 * ViewGroup. 3670 */ 3671 public void removeAllViews() { 3672 removeAllViewsInLayout(); 3673 requestLayout(); 3674 invalidate(true); 3675 } 3676 3677 /** 3678 * Called by a ViewGroup subclass to remove child views from itself, 3679 * when it must first know its size on screen before it can calculate how many 3680 * child views it will render. An example is a Gallery or a ListView, which 3681 * may "have" 50 children, but actually only render the number of children 3682 * that can currently fit inside the object on screen. Do not call 3683 * this method unless you are extending ViewGroup and understand the 3684 * view measuring and layout pipeline. 3685 */ 3686 public void removeAllViewsInLayout() { 3687 final int count = mChildrenCount; 3688 if (count <= 0) { 3689 return; 3690 } 3691 3692 final View[] children = mChildren; 3693 mChildrenCount = 0; 3694 3695 final View focused = mFocused; 3696 final boolean detach = mAttachInfo != null; 3697 View clearChildFocus = null; 3698 3699 needGlobalAttributesUpdate(false); 3700 3701 for (int i = count - 1; i >= 0; i--) { 3702 final View view = children[i]; 3703 3704 if (mTransition != null) { 3705 mTransition.removeChild(this, view); 3706 } 3707 3708 if (view == focused) { 3709 view.clearFocusForRemoval(); 3710 clearChildFocus = view; 3711 } 3712 3713 if (view.getAnimation() != null || 3714 (mTransitioningViews != null && mTransitioningViews.contains(view))) { 3715 addDisappearingView(view); 3716 } else if (detach) { 3717 view.dispatchDetachedFromWindow(); 3718 } 3719 3720 onViewRemoved(view); 3721 3722 view.mParent = null; 3723 children[i] = null; 3724 } 3725 3726 if (clearChildFocus != null) { 3727 clearChildFocus(clearChildFocus); 3728 } 3729 } 3730 3731 /** 3732 * Finishes the removal of a detached view. This method will dispatch the detached from 3733 * window event and notify the hierarchy change listener. 3734 * 3735 * @param child the child to be definitely removed from the view hierarchy 3736 * @param animate if true and the view has an animation, the view is placed in the 3737 * disappearing views list, otherwise, it is detached from the window 3738 * 3739 * @see #attachViewToParent(View, int, android.view.ViewGroup.LayoutParams) 3740 * @see #detachAllViewsFromParent() 3741 * @see #detachViewFromParent(View) 3742 * @see #detachViewFromParent(int) 3743 */ 3744 protected void removeDetachedView(View child, boolean animate) { 3745 if (mTransition != null) { 3746 mTransition.removeChild(this, child); 3747 } 3748 3749 if (child == mFocused) { 3750 child.clearFocus(); 3751 } 3752 3753 if ((animate && child.getAnimation() != null) || 3754 (mTransitioningViews != null && mTransitioningViews.contains(child))) { 3755 addDisappearingView(child); 3756 } else if (child.mAttachInfo != null) { 3757 child.dispatchDetachedFromWindow(); 3758 } 3759 3760 onViewRemoved(child); 3761 } 3762 3763 /** 3764 * Attaches a view to this view group. Attaching a view assigns this group as the parent, 3765 * sets the layout parameters and puts the view in the list of children so it can be retrieved 3766 * by calling {@link #getChildAt(int)}. 3767 * 3768 * This method should be called only for view which were detached from their parent. 3769 * 3770 * @param child the child to attach 3771 * @param index the index at which the child should be attached 3772 * @param params the layout parameters of the child 3773 * 3774 * @see #removeDetachedView(View, boolean) 3775 * @see #detachAllViewsFromParent() 3776 * @see #detachViewFromParent(View) 3777 * @see #detachViewFromParent(int) 3778 */ 3779 protected void attachViewToParent(View child, int index, LayoutParams params) { 3780 child.mLayoutParams = params; 3781 3782 if (index < 0) { 3783 index = mChildrenCount; 3784 } 3785 3786 addInArray(child, index); 3787 3788 child.mParent = this; 3789 child.mPrivateFlags = (child.mPrivateFlags & ~DIRTY_MASK & ~DRAWING_CACHE_VALID) | 3790 DRAWN | INVALIDATED; 3791 this.mPrivateFlags |= INVALIDATED; 3792 3793 if (child.hasFocus()) { 3794 requestChildFocus(child, child.findFocus()); 3795 } 3796 } 3797 3798 /** 3799 * Detaches a view from its parent. Detaching a view should be temporary and followed 3800 * either by a call to {@link #attachViewToParent(View, int, android.view.ViewGroup.LayoutParams)} 3801 * or a call to {@link #removeDetachedView(View, boolean)}. When a view is detached, 3802 * its parent is null and cannot be retrieved by a call to {@link #getChildAt(int)}. 3803 * 3804 * @param child the child to detach 3805 * 3806 * @see #detachViewFromParent(int) 3807 * @see #detachViewsFromParent(int, int) 3808 * @see #detachAllViewsFromParent() 3809 * @see #attachViewToParent(View, int, android.view.ViewGroup.LayoutParams) 3810 * @see #removeDetachedView(View, boolean) 3811 */ 3812 protected void detachViewFromParent(View child) { 3813 removeFromArray(indexOfChild(child)); 3814 } 3815 3816 /** 3817 * Detaches a view from its parent. Detaching a view should be temporary and followed 3818 * either by a call to {@link #attachViewToParent(View, int, android.view.ViewGroup.LayoutParams)} 3819 * or a call to {@link #removeDetachedView(View, boolean)}. When a view is detached, 3820 * its parent is null and cannot be retrieved by a call to {@link #getChildAt(int)}. 3821 * 3822 * @param index the index of the child to detach 3823 * 3824 * @see #detachViewFromParent(View) 3825 * @see #detachAllViewsFromParent() 3826 * @see #detachViewsFromParent(int, int) 3827 * @see #attachViewToParent(View, int, android.view.ViewGroup.LayoutParams) 3828 * @see #removeDetachedView(View, boolean) 3829 */ 3830 protected void detachViewFromParent(int index) { 3831 removeFromArray(index); 3832 } 3833 3834 /** 3835 * Detaches a range of view from their parent. Detaching a view should be temporary and followed 3836 * either by a call to {@link #attachViewToParent(View, int, android.view.ViewGroup.LayoutParams)} 3837 * or a call to {@link #removeDetachedView(View, boolean)}. When a view is detached, its 3838 * parent is null and cannot be retrieved by a call to {@link #getChildAt(int)}. 3839 * 3840 * @param start the first index of the childrend range to detach 3841 * @param count the number of children to detach 3842 * 3843 * @see #detachViewFromParent(View) 3844 * @see #detachViewFromParent(int) 3845 * @see #detachAllViewsFromParent() 3846 * @see #attachViewToParent(View, int, android.view.ViewGroup.LayoutParams) 3847 * @see #removeDetachedView(View, boolean) 3848 */ 3849 protected void detachViewsFromParent(int start, int count) { 3850 removeFromArray(start, count); 3851 } 3852 3853 /** 3854 * Detaches all views from the parent. Detaching a view should be temporary and followed 3855 * either by a call to {@link #attachViewToParent(View, int, android.view.ViewGroup.LayoutParams)} 3856 * or a call to {@link #removeDetachedView(View, boolean)}. When a view is detached, 3857 * its parent is null and cannot be retrieved by a call to {@link #getChildAt(int)}. 3858 * 3859 * @see #detachViewFromParent(View) 3860 * @see #detachViewFromParent(int) 3861 * @see #detachViewsFromParent(int, int) 3862 * @see #attachViewToParent(View, int, android.view.ViewGroup.LayoutParams) 3863 * @see #removeDetachedView(View, boolean) 3864 */ 3865 protected void detachAllViewsFromParent() { 3866 final int count = mChildrenCount; 3867 if (count <= 0) { 3868 return; 3869 } 3870 3871 final View[] children = mChildren; 3872 mChildrenCount = 0; 3873 3874 for (int i = count - 1; i >= 0; i--) { 3875 children[i].mParent = null; 3876 children[i] = null; 3877 } 3878 } 3879 3880 /** 3881 * Don't call or override this method. It is used for the implementation of 3882 * the view hierarchy. 3883 */ 3884 public final void invalidateChild(View child, final Rect dirty) { 3885 if (ViewDebug.TRACE_HIERARCHY) { 3886 ViewDebug.trace(this, ViewDebug.HierarchyTraceType.INVALIDATE_CHILD); 3887 } 3888 3889 ViewParent parent = this; 3890 3891 final AttachInfo attachInfo = mAttachInfo; 3892 if (attachInfo != null) { 3893 // If the child is drawing an animation, we want to copy this flag onto 3894 // ourselves and the parent to make sure the invalidate request goes 3895 // through 3896 final boolean drawAnimation = (child.mPrivateFlags & DRAW_ANIMATION) == DRAW_ANIMATION; 3897 3898 if (dirty == null) { 3899 if (child.mLayerType != LAYER_TYPE_NONE) { 3900 mPrivateFlags |= INVALIDATED; 3901 mPrivateFlags &= ~DRAWING_CACHE_VALID; 3902 child.mLocalDirtyRect.setEmpty(); 3903 } 3904 do { 3905 View view = null; 3906 if (parent instanceof View) { 3907 view = (View) parent; 3908 if (view.mLayerType != LAYER_TYPE_NONE) { 3909 view.mLocalDirtyRect.setEmpty(); 3910 if (view.getParent() instanceof View) { 3911 final View grandParent = (View) view.getParent(); 3912 grandParent.mPrivateFlags |= INVALIDATED; 3913 grandParent.mPrivateFlags &= ~DRAWING_CACHE_VALID; 3914 } 3915 } 3916 if ((view.mPrivateFlags & DIRTY_MASK) != 0) { 3917 // already marked dirty - we're done 3918 break; 3919 } 3920 } 3921 3922 if (drawAnimation) { 3923 if (view != null) { 3924 view.mPrivateFlags |= DRAW_ANIMATION; 3925 } else if (parent instanceof ViewRootImpl) { 3926 ((ViewRootImpl) parent).mIsAnimating = true; 3927 } 3928 } 3929 3930 if (parent instanceof ViewRootImpl) { 3931 ((ViewRootImpl) parent).invalidate(); 3932 parent = null; 3933 } else if (view != null) { 3934 if ((view.mPrivateFlags & DRAWN) == DRAWN || 3935 (view.mPrivateFlags & DRAWING_CACHE_VALID) == DRAWING_CACHE_VALID) { 3936 view.mPrivateFlags &= ~DRAWING_CACHE_VALID; 3937 view.mPrivateFlags |= DIRTY; 3938 parent = view.mParent; 3939 } else { 3940 parent = null; 3941 } 3942 } 3943 } while (parent != null); 3944 } else { 3945 // Check whether the child that requests the invalidate is fully opaque 3946 final boolean isOpaque = child.isOpaque() && !drawAnimation && 3947 child.getAnimation() == null; 3948 // Mark the child as dirty, using the appropriate flag 3949 // Make sure we do not set both flags at the same time 3950 int opaqueFlag = isOpaque ? DIRTY_OPAQUE : DIRTY; 3951 3952 if (child.mLayerType != LAYER_TYPE_NONE) { 3953 mPrivateFlags |= INVALIDATED; 3954 mPrivateFlags &= ~DRAWING_CACHE_VALID; 3955 child.mLocalDirtyRect.union(dirty); 3956 } 3957 3958 final int[] location = attachInfo.mInvalidateChildLocation; 3959 location[CHILD_LEFT_INDEX] = child.mLeft; 3960 location[CHILD_TOP_INDEX] = child.mTop; 3961 Matrix childMatrix = child.getMatrix(); 3962 if (!childMatrix.isIdentity()) { 3963 RectF boundingRect = attachInfo.mTmpTransformRect; 3964 boundingRect.set(dirty); 3965 //boundingRect.inset(-0.5f, -0.5f); 3966 childMatrix.mapRect(boundingRect); 3967 dirty.set((int) (boundingRect.left - 0.5f), 3968 (int) (boundingRect.top - 0.5f), 3969 (int) (boundingRect.right + 0.5f), 3970 (int) (boundingRect.bottom + 0.5f)); 3971 } 3972 3973 do { 3974 View view = null; 3975 if (parent instanceof View) { 3976 view = (View) parent; 3977 if (view.mLayerType != LAYER_TYPE_NONE && 3978 view.getParent() instanceof View) { 3979 final View grandParent = (View) view.getParent(); 3980 grandParent.mPrivateFlags |= INVALIDATED; 3981 grandParent.mPrivateFlags &= ~DRAWING_CACHE_VALID; 3982 } 3983 } 3984 3985 if (drawAnimation) { 3986 if (view != null) { 3987 view.mPrivateFlags |= DRAW_ANIMATION; 3988 } else if (parent instanceof ViewRootImpl) { 3989 ((ViewRootImpl) parent).mIsAnimating = true; 3990 } 3991 } 3992 3993 // If the parent is dirty opaque or not dirty, mark it dirty with the opaque 3994 // flag coming from the child that initiated the invalidate 3995 if (view != null) { 3996 if ((view.mViewFlags & FADING_EDGE_MASK) != 0 && 3997 view.getSolidColor() == 0) { 3998 opaqueFlag = DIRTY; 3999 } 4000 if ((view.mPrivateFlags & DIRTY_MASK) != DIRTY) { 4001 view.mPrivateFlags = (view.mPrivateFlags & ~DIRTY_MASK) | opaqueFlag; 4002 } 4003 } 4004 4005 parent = parent.invalidateChildInParent(location, dirty); 4006 if (view != null) { 4007 // Account for transform on current parent 4008 Matrix m = view.getMatrix(); 4009 if (!m.isIdentity()) { 4010 RectF boundingRect = attachInfo.mTmpTransformRect; 4011 boundingRect.set(dirty); 4012 m.mapRect(boundingRect); 4013 dirty.set((int) boundingRect.left, (int) boundingRect.top, 4014 (int) (boundingRect.right + 0.5f), 4015 (int) (boundingRect.bottom + 0.5f)); 4016 } 4017 } 4018 } while (parent != null); 4019 } 4020 } 4021 } 4022 4023 /** 4024 * Don't call or override this method. It is used for the implementation of 4025 * the view hierarchy. 4026 * 4027 * This implementation returns null if this ViewGroup does not have a parent, 4028 * if this ViewGroup is already fully invalidated or if the dirty rectangle 4029 * does not intersect with this ViewGroup's bounds. 4030 */ 4031 public ViewParent invalidateChildInParent(final int[] location, final Rect dirty) { 4032 if (ViewDebug.TRACE_HIERARCHY) { 4033 ViewDebug.trace(this, ViewDebug.HierarchyTraceType.INVALIDATE_CHILD_IN_PARENT); 4034 } 4035 4036 if ((mPrivateFlags & DRAWN) == DRAWN || 4037 (mPrivateFlags & DRAWING_CACHE_VALID) == DRAWING_CACHE_VALID) { 4038 if ((mGroupFlags & (FLAG_OPTIMIZE_INVALIDATE | FLAG_ANIMATION_DONE)) != 4039 FLAG_OPTIMIZE_INVALIDATE) { 4040 dirty.offset(location[CHILD_LEFT_INDEX] - mScrollX, 4041 location[CHILD_TOP_INDEX] - mScrollY); 4042 4043 final int left = mLeft; 4044 final int top = mTop; 4045 4046 if ((mGroupFlags & FLAG_CLIP_CHILDREN) != FLAG_CLIP_CHILDREN || 4047 dirty.intersect(0, 0, mRight - left, mBottom - top) || 4048 (mPrivateFlags & DRAW_ANIMATION) == DRAW_ANIMATION) { 4049 mPrivateFlags &= ~DRAWING_CACHE_VALID; 4050 4051 location[CHILD_LEFT_INDEX] = left; 4052 location[CHILD_TOP_INDEX] = top; 4053 4054 if (mLayerType != LAYER_TYPE_NONE) { 4055 mLocalDirtyRect.union(dirty); 4056 } 4057 4058 return mParent; 4059 } 4060 } else { 4061 mPrivateFlags &= ~DRAWN & ~DRAWING_CACHE_VALID; 4062 4063 location[CHILD_LEFT_INDEX] = mLeft; 4064 location[CHILD_TOP_INDEX] = mTop; 4065 if ((mGroupFlags & FLAG_CLIP_CHILDREN) == FLAG_CLIP_CHILDREN) { 4066 dirty.set(0, 0, mRight - mLeft, mBottom - mTop); 4067 } else { 4068 // in case the dirty rect extends outside the bounds of this container 4069 dirty.union(0, 0, mRight - mLeft, mBottom - mTop); 4070 } 4071 4072 if (mLayerType != LAYER_TYPE_NONE) { 4073 mLocalDirtyRect.union(dirty); 4074 } 4075 4076 return mParent; 4077 } 4078 } 4079 4080 return null; 4081 } 4082 4083 /** 4084 * Offset a rectangle that is in a descendant's coordinate 4085 * space into our coordinate space. 4086 * @param descendant A descendant of this view 4087 * @param rect A rectangle defined in descendant's coordinate space. 4088 */ 4089 public final void offsetDescendantRectToMyCoords(View descendant, Rect rect) { 4090 offsetRectBetweenParentAndChild(descendant, rect, true, false); 4091 } 4092 4093 /** 4094 * Offset a rectangle that is in our coordinate space into an ancestor's 4095 * coordinate space. 4096 * @param descendant A descendant of this view 4097 * @param rect A rectangle defined in descendant's coordinate space. 4098 */ 4099 public final void offsetRectIntoDescendantCoords(View descendant, Rect rect) { 4100 offsetRectBetweenParentAndChild(descendant, rect, false, false); 4101 } 4102 4103 /** 4104 * Helper method that offsets a rect either from parent to descendant or 4105 * descendant to parent. 4106 */ 4107 void offsetRectBetweenParentAndChild(View descendant, Rect rect, 4108 boolean offsetFromChildToParent, boolean clipToBounds) { 4109 4110 // already in the same coord system :) 4111 if (descendant == this) { 4112 return; 4113 } 4114 4115 ViewParent theParent = descendant.mParent; 4116 4117 // search and offset up to the parent 4118 while ((theParent != null) 4119 && (theParent instanceof View) 4120 && (theParent != this)) { 4121 4122 if (offsetFromChildToParent) { 4123 rect.offset(descendant.mLeft - descendant.mScrollX, 4124 descendant.mTop - descendant.mScrollY); 4125 if (clipToBounds) { 4126 View p = (View) theParent; 4127 rect.intersect(0, 0, p.mRight - p.mLeft, p.mBottom - p.mTop); 4128 } 4129 } else { 4130 if (clipToBounds) { 4131 View p = (View) theParent; 4132 rect.intersect(0, 0, p.mRight - p.mLeft, p.mBottom - p.mTop); 4133 } 4134 rect.offset(descendant.mScrollX - descendant.mLeft, 4135 descendant.mScrollY - descendant.mTop); 4136 } 4137 4138 descendant = (View) theParent; 4139 theParent = descendant.mParent; 4140 } 4141 4142 // now that we are up to this view, need to offset one more time 4143 // to get into our coordinate space 4144 if (theParent == this) { 4145 if (offsetFromChildToParent) { 4146 rect.offset(descendant.mLeft - descendant.mScrollX, 4147 descendant.mTop - descendant.mScrollY); 4148 } else { 4149 rect.offset(descendant.mScrollX - descendant.mLeft, 4150 descendant.mScrollY - descendant.mTop); 4151 } 4152 } else { 4153 throw new IllegalArgumentException("parameter must be a descendant of this view"); 4154 } 4155 } 4156 4157 /** 4158 * Offset the vertical location of all children of this view by the specified number of pixels. 4159 * 4160 * @param offset the number of pixels to offset 4161 * 4162 * @hide 4163 */ 4164 public void offsetChildrenTopAndBottom(int offset) { 4165 final int count = mChildrenCount; 4166 final View[] children = mChildren; 4167 4168 for (int i = 0; i < count; i++) { 4169 final View v = children[i]; 4170 v.mTop += offset; 4171 v.mBottom += offset; 4172 } 4173 } 4174 4175 /** 4176 * {@inheritDoc} 4177 */ 4178 public boolean getChildVisibleRect(View child, Rect r, android.graphics.Point offset) { 4179 // It doesn't make a whole lot of sense to call this on a view that isn't attached, 4180 // but for some simple tests it can be useful. If we don't have attach info this 4181 // will allocate memory. 4182 final RectF rect = mAttachInfo != null ? mAttachInfo.mTmpTransformRect : new RectF(); 4183 rect.set(r); 4184 4185 if (!child.hasIdentityMatrix()) { 4186 child.getMatrix().mapRect(rect); 4187 } 4188 4189 int dx = child.mLeft - mScrollX; 4190 int dy = child.mTop - mScrollY; 4191 4192 rect.offset(dx, dy); 4193 4194 if (offset != null) { 4195 if (!child.hasIdentityMatrix()) { 4196 float[] position = mAttachInfo != null ? mAttachInfo.mTmpTransformLocation 4197 : new float[2]; 4198 position[0] = offset.x; 4199 position[1] = offset.y; 4200 child.getMatrix().mapPoints(position); 4201 offset.x = (int) (position[0] + 0.5f); 4202 offset.y = (int) (position[1] + 0.5f); 4203 } 4204 offset.x += dx; 4205 offset.y += dy; 4206 } 4207 4208 if (rect.intersect(0, 0, mRight - mLeft, mBottom - mTop)) { 4209 if (mParent == null) return true; 4210 r.set((int) (rect.left + 0.5f), (int) (rect.top + 0.5f), 4211 (int) (rect.right + 0.5f), (int) (rect.bottom + 0.5f)); 4212 return mParent.getChildVisibleRect(this, r, offset); 4213 } 4214 4215 return false; 4216 } 4217 4218 /** 4219 * {@inheritDoc} 4220 */ 4221 @Override 4222 public final void layout(int l, int t, int r, int b) { 4223 if (mTransition == null || !mTransition.isChangingLayout()) { 4224 super.layout(l, t, r, b); 4225 } else { 4226 // record the fact that we noop'd it; request layout when transition finishes 4227 mLayoutSuppressed = true; 4228 } 4229 } 4230 4231 /** 4232 * {@inheritDoc} 4233 */ 4234 @Override 4235 protected abstract void onLayout(boolean changed, 4236 int l, int t, int r, int b); 4237 4238 /** 4239 * Indicates whether the view group has the ability to animate its children 4240 * after the first layout. 4241 * 4242 * @return true if the children can be animated, false otherwise 4243 */ 4244 protected boolean canAnimate() { 4245 return mLayoutAnimationController != null; 4246 } 4247 4248 /** 4249 * Runs the layout animation. Calling this method triggers a relayout of 4250 * this view group. 4251 */ 4252 public void startLayoutAnimation() { 4253 if (mLayoutAnimationController != null) { 4254 mGroupFlags |= FLAG_RUN_ANIMATION; 4255 requestLayout(); 4256 } 4257 } 4258 4259 /** 4260 * Schedules the layout animation to be played after the next layout pass 4261 * of this view group. This can be used to restart the layout animation 4262 * when the content of the view group changes or when the activity is 4263 * paused and resumed. 4264 */ 4265 public void scheduleLayoutAnimation() { 4266 mGroupFlags |= FLAG_RUN_ANIMATION; 4267 } 4268 4269 /** 4270 * Sets the layout animation controller used to animate the group's 4271 * children after the first layout. 4272 * 4273 * @param controller the animation controller 4274 */ 4275 public void setLayoutAnimation(LayoutAnimationController controller) { 4276 mLayoutAnimationController = controller; 4277 if (mLayoutAnimationController != null) { 4278 mGroupFlags |= FLAG_RUN_ANIMATION; 4279 } 4280 } 4281 4282 /** 4283 * Returns the layout animation controller used to animate the group's 4284 * children. 4285 * 4286 * @return the current animation controller 4287 */ 4288 public LayoutAnimationController getLayoutAnimation() { 4289 return mLayoutAnimationController; 4290 } 4291 4292 /** 4293 * Indicates whether the children's drawing cache is used during a layout 4294 * animation. By default, the drawing cache is enabled but this will prevent 4295 * nested layout animations from working. To nest animations, you must disable 4296 * the cache. 4297 * 4298 * @return true if the animation cache is enabled, false otherwise 4299 * 4300 * @see #setAnimationCacheEnabled(boolean) 4301 * @see View#setDrawingCacheEnabled(boolean) 4302 */ 4303 @ViewDebug.ExportedProperty 4304 public boolean isAnimationCacheEnabled() { 4305 return (mGroupFlags & FLAG_ANIMATION_CACHE) == FLAG_ANIMATION_CACHE; 4306 } 4307 4308 /** 4309 * Enables or disables the children's drawing cache during a layout animation. 4310 * By default, the drawing cache is enabled but this will prevent nested 4311 * layout animations from working. To nest animations, you must disable the 4312 * cache. 4313 * 4314 * @param enabled true to enable the animation cache, false otherwise 4315 * 4316 * @see #isAnimationCacheEnabled() 4317 * @see View#setDrawingCacheEnabled(boolean) 4318 */ 4319 public void setAnimationCacheEnabled(boolean enabled) { 4320 setBooleanFlag(FLAG_ANIMATION_CACHE, enabled); 4321 } 4322 4323 /** 4324 * Indicates whether this ViewGroup will always try to draw its children using their 4325 * drawing cache. By default this property is enabled. 4326 * 4327 * @return true if the animation cache is enabled, false otherwise 4328 * 4329 * @see #setAlwaysDrawnWithCacheEnabled(boolean) 4330 * @see #setChildrenDrawnWithCacheEnabled(boolean) 4331 * @see View#setDrawingCacheEnabled(boolean) 4332 */ 4333 @ViewDebug.ExportedProperty(category = "drawing") 4334 public boolean isAlwaysDrawnWithCacheEnabled() { 4335 return (mGroupFlags & FLAG_ALWAYS_DRAWN_WITH_CACHE) == FLAG_ALWAYS_DRAWN_WITH_CACHE; 4336 } 4337 4338 /** 4339 * Indicates whether this ViewGroup will always try to draw its children using their 4340 * drawing cache. This property can be set to true when the cache rendering is 4341 * slightly different from the children's normal rendering. Renderings can be different, 4342 * for instance, when the cache's quality is set to low. 4343 * 4344 * When this property is disabled, the ViewGroup will use the drawing cache of its 4345 * children only when asked to. It's usually the task of subclasses to tell ViewGroup 4346 * when to start using the drawing cache and when to stop using it. 4347 * 4348 * @param always true to always draw with the drawing cache, false otherwise 4349 * 4350 * @see #isAlwaysDrawnWithCacheEnabled() 4351 * @see #setChildrenDrawnWithCacheEnabled(boolean) 4352 * @see View#setDrawingCacheEnabled(boolean) 4353 * @see View#setDrawingCacheQuality(int) 4354 */ 4355 public void setAlwaysDrawnWithCacheEnabled(boolean always) { 4356 setBooleanFlag(FLAG_ALWAYS_DRAWN_WITH_CACHE, always); 4357 } 4358 4359 /** 4360 * Indicates whether the ViewGroup is currently drawing its children using 4361 * their drawing cache. 4362 * 4363 * @return true if children should be drawn with their cache, false otherwise 4364 * 4365 * @see #setAlwaysDrawnWithCacheEnabled(boolean) 4366 * @see #setChildrenDrawnWithCacheEnabled(boolean) 4367 */ 4368 @ViewDebug.ExportedProperty(category = "drawing") 4369 protected boolean isChildrenDrawnWithCacheEnabled() { 4370 return (mGroupFlags & FLAG_CHILDREN_DRAWN_WITH_CACHE) == FLAG_CHILDREN_DRAWN_WITH_CACHE; 4371 } 4372 4373 /** 4374 * Tells the ViewGroup to draw its children using their drawing cache. This property 4375 * is ignored when {@link #isAlwaysDrawnWithCacheEnabled()} is true. A child's drawing cache 4376 * will be used only if it has been enabled. 4377 * 4378 * Subclasses should call this method to start and stop using the drawing cache when 4379 * they perform performance sensitive operations, like scrolling or animating. 4380 * 4381 * @param enabled true if children should be drawn with their cache, false otherwise 4382 * 4383 * @see #setAlwaysDrawnWithCacheEnabled(boolean) 4384 * @see #isChildrenDrawnWithCacheEnabled() 4385 */ 4386 protected void setChildrenDrawnWithCacheEnabled(boolean enabled) { 4387 setBooleanFlag(FLAG_CHILDREN_DRAWN_WITH_CACHE, enabled); 4388 } 4389 4390 /** 4391 * Indicates whether the ViewGroup is drawing its children in the order defined by 4392 * {@link #getChildDrawingOrder(int, int)}. 4393 * 4394 * @return true if children drawing order is defined by {@link #getChildDrawingOrder(int, int)}, 4395 * false otherwise 4396 * 4397 * @see #setChildrenDrawingOrderEnabled(boolean) 4398 * @see #getChildDrawingOrder(int, int) 4399 */ 4400 @ViewDebug.ExportedProperty(category = "drawing") 4401 protected boolean isChildrenDrawingOrderEnabled() { 4402 return (mGroupFlags & FLAG_USE_CHILD_DRAWING_ORDER) == FLAG_USE_CHILD_DRAWING_ORDER; 4403 } 4404 4405 /** 4406 * Tells the ViewGroup whether to draw its children in the order defined by the method 4407 * {@link #getChildDrawingOrder(int, int)}. 4408 * 4409 * @param enabled true if the order of the children when drawing is determined by 4410 * {@link #getChildDrawingOrder(int, int)}, false otherwise 4411 * 4412 * @see #isChildrenDrawingOrderEnabled() 4413 * @see #getChildDrawingOrder(int, int) 4414 */ 4415 protected void setChildrenDrawingOrderEnabled(boolean enabled) { 4416 setBooleanFlag(FLAG_USE_CHILD_DRAWING_ORDER, enabled); 4417 } 4418 4419 private void setBooleanFlag(int flag, boolean value) { 4420 if (value) { 4421 mGroupFlags |= flag; 4422 } else { 4423 mGroupFlags &= ~flag; 4424 } 4425 } 4426 4427 /** 4428 * Returns an integer indicating what types of drawing caches are kept in memory. 4429 * 4430 * @see #setPersistentDrawingCache(int) 4431 * @see #setAnimationCacheEnabled(boolean) 4432 * 4433 * @return one or a combination of {@link #PERSISTENT_NO_CACHE}, 4434 * {@link #PERSISTENT_ANIMATION_CACHE}, {@link #PERSISTENT_SCROLLING_CACHE} 4435 * and {@link #PERSISTENT_ALL_CACHES} 4436 */ 4437 @ViewDebug.ExportedProperty(category = "drawing", mapping = { 4438 @ViewDebug.IntToString(from = PERSISTENT_NO_CACHE, to = "NONE"), 4439 @ViewDebug.IntToString(from = PERSISTENT_ANIMATION_CACHE, to = "ANIMATION"), 4440 @ViewDebug.IntToString(from = PERSISTENT_SCROLLING_CACHE, to = "SCROLLING"), 4441 @ViewDebug.IntToString(from = PERSISTENT_ALL_CACHES, to = "ALL") 4442 }) 4443 public int getPersistentDrawingCache() { 4444 return mPersistentDrawingCache; 4445 } 4446 4447 /** 4448 * Indicates what types of drawing caches should be kept in memory after 4449 * they have been created. 4450 * 4451 * @see #getPersistentDrawingCache() 4452 * @see #setAnimationCacheEnabled(boolean) 4453 * 4454 * @param drawingCacheToKeep one or a combination of {@link #PERSISTENT_NO_CACHE}, 4455 * {@link #PERSISTENT_ANIMATION_CACHE}, {@link #PERSISTENT_SCROLLING_CACHE} 4456 * and {@link #PERSISTENT_ALL_CACHES} 4457 */ 4458 public void setPersistentDrawingCache(int drawingCacheToKeep) { 4459 mPersistentDrawingCache = drawingCacheToKeep & PERSISTENT_ALL_CACHES; 4460 } 4461 4462 /** 4463 * Returns a new set of layout parameters based on the supplied attributes set. 4464 * 4465 * @param attrs the attributes to build the layout parameters from 4466 * 4467 * @return an instance of {@link android.view.ViewGroup.LayoutParams} or one 4468 * of its descendants 4469 */ 4470 public LayoutParams generateLayoutParams(AttributeSet attrs) { 4471 return new LayoutParams(getContext(), attrs); 4472 } 4473 4474 /** 4475 * Returns a safe set of layout parameters based on the supplied layout params. 4476 * When a ViewGroup is passed a View whose layout params do not pass the test of 4477 * {@link #checkLayoutParams(android.view.ViewGroup.LayoutParams)}, this method 4478 * is invoked. This method should return a new set of layout params suitable for 4479 * this ViewGroup, possibly by copying the appropriate attributes from the 4480 * specified set of layout params. 4481 * 4482 * @param p The layout parameters to convert into a suitable set of layout parameters 4483 * for this ViewGroup. 4484 * 4485 * @return an instance of {@link android.view.ViewGroup.LayoutParams} or one 4486 * of its descendants 4487 */ 4488 protected LayoutParams generateLayoutParams(ViewGroup.LayoutParams p) { 4489 return p; 4490 } 4491 4492 /** 4493 * Returns a set of default layout parameters. These parameters are requested 4494 * when the View passed to {@link #addView(View)} has no layout parameters 4495 * already set. If null is returned, an exception is thrown from addView. 4496 * 4497 * @return a set of default layout parameters or null 4498 */ 4499 protected LayoutParams generateDefaultLayoutParams() { 4500 return new LayoutParams(LayoutParams.WRAP_CONTENT, LayoutParams.WRAP_CONTENT); 4501 } 4502 4503 /** 4504 * @hide 4505 */ 4506 @Override 4507 protected boolean dispatchConsistencyCheck(int consistency) { 4508 boolean result = super.dispatchConsistencyCheck(consistency); 4509 4510 final int count = mChildrenCount; 4511 final View[] children = mChildren; 4512 for (int i = 0; i < count; i++) { 4513 if (!children[i].dispatchConsistencyCheck(consistency)) result = false; 4514 } 4515 4516 return result; 4517 } 4518 4519 /** 4520 * @hide 4521 */ 4522 @Override 4523 protected boolean onConsistencyCheck(int consistency) { 4524 boolean result = super.onConsistencyCheck(consistency); 4525 4526 final boolean checkLayout = (consistency & ViewDebug.CONSISTENCY_LAYOUT) != 0; 4527 final boolean checkDrawing = (consistency & ViewDebug.CONSISTENCY_DRAWING) != 0; 4528 4529 if (checkLayout) { 4530 final int count = mChildrenCount; 4531 final View[] children = mChildren; 4532 for (int i = 0; i < count; i++) { 4533 if (children[i].getParent() != this) { 4534 result = false; 4535 android.util.Log.d(ViewDebug.CONSISTENCY_LOG_TAG, 4536 "View " + children[i] + " has no parent/a parent that is not " + this); 4537 } 4538 } 4539 } 4540 4541 if (checkDrawing) { 4542 // If this group is dirty, check that the parent is dirty as well 4543 if ((mPrivateFlags & DIRTY_MASK) != 0) { 4544 final ViewParent parent = getParent(); 4545 if (parent != null && !(parent instanceof ViewRootImpl)) { 4546 if ((((View) parent).mPrivateFlags & DIRTY_MASK) == 0) { 4547 result = false; 4548 android.util.Log.d(ViewDebug.CONSISTENCY_LOG_TAG, 4549 "ViewGroup " + this + " is dirty but its parent is not: " + this); 4550 } 4551 } 4552 } 4553 } 4554 4555 return result; 4556 } 4557 4558 /** 4559 * {@inheritDoc} 4560 */ 4561 @Override 4562 protected void debug(int depth) { 4563 super.debug(depth); 4564 String output; 4565 4566 if (mFocused != null) { 4567 output = debugIndent(depth); 4568 output += "mFocused"; 4569 Log.d(VIEW_LOG_TAG, output); 4570 } 4571 if (mChildrenCount != 0) { 4572 output = debugIndent(depth); 4573 output += "{"; 4574 Log.d(VIEW_LOG_TAG, output); 4575 } 4576 int count = mChildrenCount; 4577 for (int i = 0; i < count; i++) { 4578 View child = mChildren[i]; 4579 child.debug(depth + 1); 4580 } 4581 4582 if (mChildrenCount != 0) { 4583 output = debugIndent(depth); 4584 output += "}"; 4585 Log.d(VIEW_LOG_TAG, output); 4586 } 4587 } 4588 4589 /** 4590 * Returns the position in the group of the specified child view. 4591 * 4592 * @param child the view for which to get the position 4593 * @return a positive integer representing the position of the view in the 4594 * group, or -1 if the view does not exist in the group 4595 */ 4596 public int indexOfChild(View child) { 4597 final int count = mChildrenCount; 4598 final View[] children = mChildren; 4599 for (int i = 0; i < count; i++) { 4600 if (children[i] == child) { 4601 return i; 4602 } 4603 } 4604 return -1; 4605 } 4606 4607 /** 4608 * Returns the number of children in the group. 4609 * 4610 * @return a positive integer representing the number of children in 4611 * the group 4612 */ 4613 public int getChildCount() { 4614 return mChildrenCount; 4615 } 4616 4617 /** 4618 * Returns the view at the specified position in the group. 4619 * 4620 * @param index the position at which to get the view from 4621 * @return the view at the specified position or null if the position 4622 * does not exist within the group 4623 */ 4624 public View getChildAt(int index) { 4625 if (index < 0 || index >= mChildrenCount) { 4626 return null; 4627 } 4628 return mChildren[index]; 4629 } 4630 4631 /** 4632 * Ask all of the children of this view to measure themselves, taking into 4633 * account both the MeasureSpec requirements for this view and its padding. 4634 * We skip children that are in the GONE state The heavy lifting is done in 4635 * getChildMeasureSpec. 4636 * 4637 * @param widthMeasureSpec The width requirements for this view 4638 * @param heightMeasureSpec The height requirements for this view 4639 */ 4640 protected void measureChildren(int widthMeasureSpec, int heightMeasureSpec) { 4641 final int size = mChildrenCount; 4642 final View[] children = mChildren; 4643 for (int i = 0; i < size; ++i) { 4644 final View child = children[i]; 4645 if ((child.mViewFlags & VISIBILITY_MASK) != GONE) { 4646 measureChild(child, widthMeasureSpec, heightMeasureSpec); 4647 } 4648 } 4649 } 4650 4651 /** 4652 * Ask one of the children of this view to measure itself, taking into 4653 * account both the MeasureSpec requirements for this view and its padding. 4654 * The heavy lifting is done in getChildMeasureSpec. 4655 * 4656 * @param child The child to measure 4657 * @param parentWidthMeasureSpec The width requirements for this view 4658 * @param parentHeightMeasureSpec The height requirements for this view 4659 */ 4660 protected void measureChild(View child, int parentWidthMeasureSpec, 4661 int parentHeightMeasureSpec) { 4662 final LayoutParams lp = child.getLayoutParams(); 4663 4664 final int childWidthMeasureSpec = getChildMeasureSpec(parentWidthMeasureSpec, 4665 mPaddingLeft + mPaddingRight, lp.width); 4666 final int childHeightMeasureSpec = getChildMeasureSpec(parentHeightMeasureSpec, 4667 mPaddingTop + mPaddingBottom, lp.height); 4668 4669 child.measure(childWidthMeasureSpec, childHeightMeasureSpec); 4670 } 4671 4672 /** 4673 * Ask one of the children of this view to measure itself, taking into 4674 * account both the MeasureSpec requirements for this view and its padding 4675 * and margins. The child must have MarginLayoutParams The heavy lifting is 4676 * done in getChildMeasureSpec. 4677 * 4678 * @param child The child to measure 4679 * @param parentWidthMeasureSpec The width requirements for this view 4680 * @param widthUsed Extra space that has been used up by the parent 4681 * horizontally (possibly by other children of the parent) 4682 * @param parentHeightMeasureSpec The height requirements for this view 4683 * @param heightUsed Extra space that has been used up by the parent 4684 * vertically (possibly by other children of the parent) 4685 */ 4686 protected void measureChildWithMargins(View child, 4687 int parentWidthMeasureSpec, int widthUsed, 4688 int parentHeightMeasureSpec, int heightUsed) { 4689 final MarginLayoutParams lp = (MarginLayoutParams) child.getLayoutParams(); 4690 4691 final int childWidthMeasureSpec = getChildMeasureSpec(parentWidthMeasureSpec, 4692 mPaddingLeft + mPaddingRight + lp.leftMargin + lp.rightMargin 4693 + widthUsed, lp.width); 4694 final int childHeightMeasureSpec = getChildMeasureSpec(parentHeightMeasureSpec, 4695 mPaddingTop + mPaddingBottom + lp.topMargin + lp.bottomMargin 4696 + heightUsed, lp.height); 4697 4698 child.measure(childWidthMeasureSpec, childHeightMeasureSpec); 4699 } 4700 4701 /** 4702 * Does the hard part of measureChildren: figuring out the MeasureSpec to 4703 * pass to a particular child. This method figures out the right MeasureSpec 4704 * for one dimension (height or width) of one child view. 4705 * 4706 * The goal is to combine information from our MeasureSpec with the 4707 * LayoutParams of the child to get the best possible results. For example, 4708 * if the this view knows its size (because its MeasureSpec has a mode of 4709 * EXACTLY), and the child has indicated in its LayoutParams that it wants 4710 * to be the same size as the parent, the parent should ask the child to 4711 * layout given an exact size. 4712 * 4713 * @param spec The requirements for this view 4714 * @param padding The padding of this view for the current dimension and 4715 * margins, if applicable 4716 * @param childDimension How big the child wants to be in the current 4717 * dimension 4718 * @return a MeasureSpec integer for the child 4719 */ 4720 public static int getChildMeasureSpec(int spec, int padding, int childDimension) { 4721 int specMode = MeasureSpec.getMode(spec); 4722 int specSize = MeasureSpec.getSize(spec); 4723 4724 int size = Math.max(0, specSize - padding); 4725 4726 int resultSize = 0; 4727 int resultMode = 0; 4728 4729 switch (specMode) { 4730 // Parent has imposed an exact size on us 4731 case MeasureSpec.EXACTLY: 4732 if (childDimension >= 0) { 4733 resultSize = childDimension; 4734 resultMode = MeasureSpec.EXACTLY; 4735 } else if (childDimension == LayoutParams.MATCH_PARENT) { 4736 // Child wants to be our size. So be it. 4737 resultSize = size; 4738 resultMode = MeasureSpec.EXACTLY; 4739 } else if (childDimension == LayoutParams.WRAP_CONTENT) { 4740 // Child wants to determine its own size. It can't be 4741 // bigger than us. 4742 resultSize = size; 4743 resultMode = MeasureSpec.AT_MOST; 4744 } 4745 break; 4746 4747 // Parent has imposed a maximum size on us 4748 case MeasureSpec.AT_MOST: 4749 if (childDimension >= 0) { 4750 // Child wants a specific size... so be it 4751 resultSize = childDimension; 4752 resultMode = MeasureSpec.EXACTLY; 4753 } else if (childDimension == LayoutParams.MATCH_PARENT) { 4754 // Child wants to be our size, but our size is not fixed. 4755 // Constrain child to not be bigger than us. 4756 resultSize = size; 4757 resultMode = MeasureSpec.AT_MOST; 4758 } else if (childDimension == LayoutParams.WRAP_CONTENT) { 4759 // Child wants to determine its own size. It can't be 4760 // bigger than us. 4761 resultSize = size; 4762 resultMode = MeasureSpec.AT_MOST; 4763 } 4764 break; 4765 4766 // Parent asked to see how big we want to be 4767 case MeasureSpec.UNSPECIFIED: 4768 if (childDimension >= 0) { 4769 // Child wants a specific size... let him have it 4770 resultSize = childDimension; 4771 resultMode = MeasureSpec.EXACTLY; 4772 } else if (childDimension == LayoutParams.MATCH_PARENT) { 4773 // Child wants to be our size... find out how big it should 4774 // be 4775 resultSize = 0; 4776 resultMode = MeasureSpec.UNSPECIFIED; 4777 } else if (childDimension == LayoutParams.WRAP_CONTENT) { 4778 // Child wants to determine its own size.... find out how 4779 // big it should be 4780 resultSize = 0; 4781 resultMode = MeasureSpec.UNSPECIFIED; 4782 } 4783 break; 4784 } 4785 return MeasureSpec.makeMeasureSpec(resultSize, resultMode); 4786 } 4787 4788 4789 /** 4790 * Removes any pending animations for views that have been removed. Call 4791 * this if you don't want animations for exiting views to stack up. 4792 */ 4793 public void clearDisappearingChildren() { 4794 if (mDisappearingChildren != null) { 4795 mDisappearingChildren.clear(); 4796 } 4797 } 4798 4799 /** 4800 * Add a view which is removed from mChildren but still needs animation 4801 * 4802 * @param v View to add 4803 */ 4804 private void addDisappearingView(View v) { 4805 ArrayList<View> disappearingChildren = mDisappearingChildren; 4806 4807 if (disappearingChildren == null) { 4808 disappearingChildren = mDisappearingChildren = new ArrayList<View>(); 4809 } 4810 4811 disappearingChildren.add(v); 4812 } 4813 4814 /** 4815 * Cleanup a view when its animation is done. This may mean removing it from 4816 * the list of disappearing views. 4817 * 4818 * @param view The view whose animation has finished 4819 * @param animation The animation, cannot be null 4820 */ 4821 private void finishAnimatingView(final View view, Animation animation) { 4822 final ArrayList<View> disappearingChildren = mDisappearingChildren; 4823 if (disappearingChildren != null) { 4824 if (disappearingChildren.contains(view)) { 4825 disappearingChildren.remove(view); 4826 4827 if (view.mAttachInfo != null) { 4828 view.dispatchDetachedFromWindow(); 4829 } 4830 4831 view.clearAnimation(); 4832 mGroupFlags |= FLAG_INVALIDATE_REQUIRED; 4833 } 4834 } 4835 4836 if (animation != null && !animation.getFillAfter()) { 4837 view.clearAnimation(); 4838 } 4839 4840 if ((view.mPrivateFlags & ANIMATION_STARTED) == ANIMATION_STARTED) { 4841 view.onAnimationEnd(); 4842 // Should be performed by onAnimationEnd() but this avoid an infinite loop, 4843 // so we'd rather be safe than sorry 4844 view.mPrivateFlags &= ~ANIMATION_STARTED; 4845 // Draw one more frame after the animation is done 4846 mGroupFlags |= FLAG_INVALIDATE_REQUIRED; 4847 } 4848 } 4849 4850 /** 4851 * Utility function called by View during invalidation to determine whether a view that 4852 * is invisible or gone should still be invalidated because it is being transitioned (and 4853 * therefore still needs to be drawn). 4854 */ 4855 boolean isViewTransitioning(View view) { 4856 return (mTransitioningViews != null && mTransitioningViews.contains(view)); 4857 } 4858 4859 /** 4860 * This method tells the ViewGroup that the given View object, which should have this 4861 * ViewGroup as its parent, 4862 * should be kept around (re-displayed when the ViewGroup draws its children) even if it 4863 * is removed from its parent. This allows animations, such as those used by 4864 * {@link android.app.Fragment} and {@link android.animation.LayoutTransition} to animate 4865 * the removal of views. A call to this method should always be accompanied by a later call 4866 * to {@link #endViewTransition(View)}, such as after an animation on the View has finished, 4867 * so that the View finally gets removed. 4868 * 4869 * @param view The View object to be kept visible even if it gets removed from its parent. 4870 */ 4871 public void startViewTransition(View view) { 4872 if (view.mParent == this) { 4873 if (mTransitioningViews == null) { 4874 mTransitioningViews = new ArrayList<View>(); 4875 } 4876 mTransitioningViews.add(view); 4877 } 4878 } 4879 4880 /** 4881 * This method should always be called following an earlier call to 4882 * {@link #startViewTransition(View)}. The given View is finally removed from its parent 4883 * and will no longer be displayed. Note that this method does not perform the functionality 4884 * of removing a view from its parent; it just discontinues the display of a View that 4885 * has previously been removed. 4886 * 4887 * @return view The View object that has been removed but is being kept around in the visible 4888 * hierarchy by an earlier call to {@link #startViewTransition(View)}. 4889 */ 4890 public void endViewTransition(View view) { 4891 if (mTransitioningViews != null) { 4892 mTransitioningViews.remove(view); 4893 final ArrayList<View> disappearingChildren = mDisappearingChildren; 4894 if (disappearingChildren != null && disappearingChildren.contains(view)) { 4895 disappearingChildren.remove(view); 4896 if (mVisibilityChangingChildren != null && 4897 mVisibilityChangingChildren.contains(view)) { 4898 mVisibilityChangingChildren.remove(view); 4899 } else { 4900 if (view.mAttachInfo != null) { 4901 view.dispatchDetachedFromWindow(); 4902 } 4903 if (view.mParent != null) { 4904 view.mParent = null; 4905 } 4906 } 4907 mGroupFlags |= FLAG_INVALIDATE_REQUIRED; 4908 } 4909 } 4910 } 4911 4912 private LayoutTransition.TransitionListener mLayoutTransitionListener = 4913 new LayoutTransition.TransitionListener() { 4914 @Override 4915 public void startTransition(LayoutTransition transition, ViewGroup container, 4916 View view, int transitionType) { 4917 // We only care about disappearing items, since we need special logic to keep 4918 // those items visible after they've been 'removed' 4919 if (transitionType == LayoutTransition.DISAPPEARING) { 4920 startViewTransition(view); 4921 } 4922 } 4923 4924 @Override 4925 public void endTransition(LayoutTransition transition, ViewGroup container, 4926 View view, int transitionType) { 4927 if (mLayoutSuppressed && !transition.isChangingLayout()) { 4928 requestLayout(); 4929 mLayoutSuppressed = false; 4930 } 4931 if (transitionType == LayoutTransition.DISAPPEARING && mTransitioningViews != null) { 4932 endViewTransition(view); 4933 } 4934 } 4935 }; 4936 4937 /** 4938 * {@inheritDoc} 4939 */ 4940 @Override 4941 public boolean gatherTransparentRegion(Region region) { 4942 // If no transparent regions requested, we are always opaque. 4943 final boolean meOpaque = (mPrivateFlags & View.REQUEST_TRANSPARENT_REGIONS) == 0; 4944 if (meOpaque && region == null) { 4945 // The caller doesn't care about the region, so stop now. 4946 return true; 4947 } 4948 super.gatherTransparentRegion(region); 4949 final View[] children = mChildren; 4950 final int count = mChildrenCount; 4951 boolean noneOfTheChildrenAreTransparent = true; 4952 for (int i = 0; i < count; i++) { 4953 final View child = children[i]; 4954 if ((child.mViewFlags & VISIBILITY_MASK) == VISIBLE || child.getAnimation() != null) { 4955 if (!child.gatherTransparentRegion(region)) { 4956 noneOfTheChildrenAreTransparent = false; 4957 } 4958 } 4959 } 4960 return meOpaque || noneOfTheChildrenAreTransparent; 4961 } 4962 4963 /** 4964 * {@inheritDoc} 4965 */ 4966 public void requestTransparentRegion(View child) { 4967 if (child != null) { 4968 child.mPrivateFlags |= View.REQUEST_TRANSPARENT_REGIONS; 4969 if (mParent != null) { 4970 mParent.requestTransparentRegion(this); 4971 } 4972 } 4973 } 4974 4975 4976 @Override 4977 protected boolean fitSystemWindows(Rect insets) { 4978 boolean done = super.fitSystemWindows(insets); 4979 if (!done) { 4980 final int count = mChildrenCount; 4981 final View[] children = mChildren; 4982 for (int i = 0; i < count; i++) { 4983 done = children[i].fitSystemWindows(insets); 4984 if (done) { 4985 break; 4986 } 4987 } 4988 } 4989 return done; 4990 } 4991 4992 /** 4993 * Returns the animation listener to which layout animation events are 4994 * sent. 4995 * 4996 * @return an {@link android.view.animation.Animation.AnimationListener} 4997 */ 4998 public Animation.AnimationListener getLayoutAnimationListener() { 4999 return mAnimationListener; 5000 } 5001 5002 @Override 5003 protected void drawableStateChanged() { 5004 super.drawableStateChanged(); 5005 5006 if ((mGroupFlags & FLAG_NOTIFY_CHILDREN_ON_DRAWABLE_STATE_CHANGE) != 0) { 5007 if ((mGroupFlags & FLAG_ADD_STATES_FROM_CHILDREN) != 0) { 5008 throw new IllegalStateException("addStateFromChildren cannot be enabled if a" 5009 + " child has duplicateParentState set to true"); 5010 } 5011 5012 final View[] children = mChildren; 5013 final int count = mChildrenCount; 5014 5015 for (int i = 0; i < count; i++) { 5016 final View child = children[i]; 5017 if ((child.mViewFlags & DUPLICATE_PARENT_STATE) != 0) { 5018 child.refreshDrawableState(); 5019 } 5020 } 5021 } 5022 } 5023 5024 @Override 5025 public void jumpDrawablesToCurrentState() { 5026 super.jumpDrawablesToCurrentState(); 5027 final View[] children = mChildren; 5028 final int count = mChildrenCount; 5029 for (int i = 0; i < count; i++) { 5030 children[i].jumpDrawablesToCurrentState(); 5031 } 5032 } 5033 5034 @Override 5035 protected int[] onCreateDrawableState(int extraSpace) { 5036 if ((mGroupFlags & FLAG_ADD_STATES_FROM_CHILDREN) == 0) { 5037 return super.onCreateDrawableState(extraSpace); 5038 } 5039 5040 int need = 0; 5041 int n = getChildCount(); 5042 for (int i = 0; i < n; i++) { 5043 int[] childState = getChildAt(i).getDrawableState(); 5044 5045 if (childState != null) { 5046 need += childState.length; 5047 } 5048 } 5049 5050 int[] state = super.onCreateDrawableState(extraSpace + need); 5051 5052 for (int i = 0; i < n; i++) { 5053 int[] childState = getChildAt(i).getDrawableState(); 5054 5055 if (childState != null) { 5056 state = mergeDrawableStates(state, childState); 5057 } 5058 } 5059 5060 return state; 5061 } 5062 5063 /** 5064 * Sets whether this ViewGroup's drawable states also include 5065 * its children's drawable states. This is used, for example, to 5066 * make a group appear to be focused when its child EditText or button 5067 * is focused. 5068 */ 5069 public void setAddStatesFromChildren(boolean addsStates) { 5070 if (addsStates) { 5071 mGroupFlags |= FLAG_ADD_STATES_FROM_CHILDREN; 5072 } else { 5073 mGroupFlags &= ~FLAG_ADD_STATES_FROM_CHILDREN; 5074 } 5075 5076 refreshDrawableState(); 5077 } 5078 5079 /** 5080 * Returns whether this ViewGroup's drawable states also include 5081 * its children's drawable states. This is used, for example, to 5082 * make a group appear to be focused when its child EditText or button 5083 * is focused. 5084 */ 5085 public boolean addStatesFromChildren() { 5086 return (mGroupFlags & FLAG_ADD_STATES_FROM_CHILDREN) != 0; 5087 } 5088 5089 /** 5090 * If {link #addStatesFromChildren} is true, refreshes this group's 5091 * drawable state (to include the states from its children). 5092 */ 5093 public void childDrawableStateChanged(View child) { 5094 if ((mGroupFlags & FLAG_ADD_STATES_FROM_CHILDREN) != 0) { 5095 refreshDrawableState(); 5096 } 5097 } 5098 5099 /** 5100 * Specifies the animation listener to which layout animation events must 5101 * be sent. Only 5102 * {@link android.view.animation.Animation.AnimationListener#onAnimationStart(Animation)} 5103 * and 5104 * {@link android.view.animation.Animation.AnimationListener#onAnimationEnd(Animation)} 5105 * are invoked. 5106 * 5107 * @param animationListener the layout animation listener 5108 */ 5109 public void setLayoutAnimationListener(Animation.AnimationListener animationListener) { 5110 mAnimationListener = animationListener; 5111 } 5112 5113 /** 5114 * This method is called by LayoutTransition when there are 'changing' animations that need 5115 * to start after the layout/setup phase. The request is forwarded to the ViewAncestor, who 5116 * starts all pending transitions prior to the drawing phase in the current traversal. 5117 * 5118 * @param transition The LayoutTransition to be started on the next traversal. 5119 * 5120 * @hide 5121 */ 5122 public void requestTransitionStart(LayoutTransition transition) { 5123 ViewRootImpl viewAncestor = getViewRootImpl(); 5124 if (viewAncestor != null) { 5125 viewAncestor.requestTransitionStart(transition); 5126 } 5127 } 5128 5129 @Override 5130 protected void resetResolvedLayoutDirection() { 5131 super.resetResolvedLayoutDirection(); 5132 5133 // Take care of resetting the children resolution too 5134 final int count = getChildCount(); 5135 for (int i = 0; i < count; i++) { 5136 final View child = getChildAt(i); 5137 if (child.getLayoutDirection() == LAYOUT_DIRECTION_INHERIT) { 5138 child.resetResolvedLayoutDirection(); 5139 } 5140 } 5141 } 5142 5143 @Override 5144 protected void resetResolvedTextDirection() { 5145 super.resetResolvedTextDirection(); 5146 5147 // Take care of resetting the children resolution too 5148 final int count = getChildCount(); 5149 for (int i = 0; i < count; i++) { 5150 final View child = getChildAt(i); 5151 if (child.getTextDirection() == TEXT_DIRECTION_INHERIT) { 5152 child.resetResolvedTextDirection(); 5153 } 5154 } 5155 } 5156 5157 /** 5158 * Return true if the pressed state should be delayed for children or descendants of this 5159 * ViewGroup. Generally, this should be done for containers that can scroll, such as a List. 5160 * This prevents the pressed state from appearing when the user is actually trying to scroll 5161 * the content. 5162 * 5163 * The default implementation returns true for compatibility reasons. Subclasses that do 5164 * not scroll should generally override this method and return false. 5165 */ 5166 public boolean shouldDelayChildPressedState() { 5167 return true; 5168 } 5169 5170 /** 5171 * LayoutParams are used by views to tell their parents how they want to be 5172 * laid out. See 5173 * {@link android.R.styleable#ViewGroup_Layout ViewGroup Layout Attributes} 5174 * for a list of all child view attributes that this class supports. 5175 * 5176 * <p> 5177 * The base LayoutParams class just describes how big the view wants to be 5178 * for both width and height. For each dimension, it can specify one of: 5179 * <ul> 5180 * <li>FILL_PARENT (renamed MATCH_PARENT in API Level 8 and higher), which 5181 * means that the view wants to be as big as its parent (minus padding) 5182 * <li> WRAP_CONTENT, which means that the view wants to be just big enough 5183 * to enclose its content (plus padding) 5184 * <li> an exact number 5185 * </ul> 5186 * There are subclasses of LayoutParams for different subclasses of 5187 * ViewGroup. For example, AbsoluteLayout has its own subclass of 5188 * LayoutParams which adds an X and Y value.</p> 5189 * 5190 * <div class="special reference"> 5191 * <h3>Developer Guides</h3> 5192 * <p>For more information about creating user interface layouts, read the 5193 * <a href="{@docRoot}guide/topics/ui/declaring-layout.html">XML Layouts</a> developer 5194 * guide.</p></div> 5195 * 5196 * @attr ref android.R.styleable#ViewGroup_Layout_layout_height 5197 * @attr ref android.R.styleable#ViewGroup_Layout_layout_width 5198 */ 5199 public static class LayoutParams { 5200 /** 5201 * Special value for the height or width requested by a View. 5202 * FILL_PARENT means that the view wants to be as big as its parent, 5203 * minus the parent's padding, if any. This value is deprecated 5204 * starting in API Level 8 and replaced by {@link #MATCH_PARENT}. 5205 */ 5206 @SuppressWarnings({"UnusedDeclaration"}) 5207 @Deprecated 5208 public static final int FILL_PARENT = -1; 5209 5210 /** 5211 * Special value for the height or width requested by a View. 5212 * MATCH_PARENT means that the view wants to be as big as its parent, 5213 * minus the parent's padding, if any. Introduced in API Level 8. 5214 */ 5215 public static final int MATCH_PARENT = -1; 5216 5217 /** 5218 * Special value for the height or width requested by a View. 5219 * WRAP_CONTENT means that the view wants to be just large enough to fit 5220 * its own internal content, taking its own padding into account. 5221 */ 5222 public static final int WRAP_CONTENT = -2; 5223 5224 /** 5225 * Information about how wide the view wants to be. Can be one of the 5226 * constants FILL_PARENT (replaced by MATCH_PARENT , 5227 * in API Level 8) or WRAP_CONTENT. or an exact size. 5228 */ 5229 @ViewDebug.ExportedProperty(category = "layout", mapping = { 5230 @ViewDebug.IntToString(from = MATCH_PARENT, to = "MATCH_PARENT"), 5231 @ViewDebug.IntToString(from = WRAP_CONTENT, to = "WRAP_CONTENT") 5232 }) 5233 public int width; 5234 5235 /** 5236 * Information about how tall the view wants to be. Can be one of the 5237 * constants FILL_PARENT (replaced by MATCH_PARENT , 5238 * in API Level 8) or WRAP_CONTENT. or an exact size. 5239 */ 5240 @ViewDebug.ExportedProperty(category = "layout", mapping = { 5241 @ViewDebug.IntToString(from = MATCH_PARENT, to = "MATCH_PARENT"), 5242 @ViewDebug.IntToString(from = WRAP_CONTENT, to = "WRAP_CONTENT") 5243 }) 5244 public int height; 5245 5246 /** 5247 * Used to animate layouts. 5248 */ 5249 public LayoutAnimationController.AnimationParameters layoutAnimationParameters; 5250 5251 /** 5252 * Creates a new set of layout parameters. The values are extracted from 5253 * the supplied attributes set and context. The XML attributes mapped 5254 * to this set of layout parameters are: 5255 * 5256 * <ul> 5257 * <li><code>layout_width</code>: the width, either an exact value, 5258 * {@link #WRAP_CONTENT}, or {@link #FILL_PARENT} (replaced by 5259 * {@link #MATCH_PARENT} in API Level 8)</li> 5260 * <li><code>layout_height</code>: the height, either an exact value, 5261 * {@link #WRAP_CONTENT}, or {@link #FILL_PARENT} (replaced by 5262 * {@link #MATCH_PARENT} in API Level 8)</li> 5263 * </ul> 5264 * 5265 * @param c the application environment 5266 * @param attrs the set of attributes from which to extract the layout 5267 * parameters' values 5268 */ 5269 public LayoutParams(Context c, AttributeSet attrs) { 5270 TypedArray a = c.obtainStyledAttributes(attrs, R.styleable.ViewGroup_Layout); 5271 setBaseAttributes(a, 5272 R.styleable.ViewGroup_Layout_layout_width, 5273 R.styleable.ViewGroup_Layout_layout_height); 5274 a.recycle(); 5275 } 5276 5277 /** 5278 * Creates a new set of layout parameters with the specified width 5279 * and height. 5280 * 5281 * @param width the width, either {@link #WRAP_CONTENT}, 5282 * {@link #FILL_PARENT} (replaced by {@link #MATCH_PARENT} in 5283 * API Level 8), or a fixed size in pixels 5284 * @param height the height, either {@link #WRAP_CONTENT}, 5285 * {@link #FILL_PARENT} (replaced by {@link #MATCH_PARENT} in 5286 * API Level 8), or a fixed size in pixels 5287 */ 5288 public LayoutParams(int width, int height) { 5289 this.width = width; 5290 this.height = height; 5291 } 5292 5293 /** 5294 * Copy constructor. Clones the width and height values of the source. 5295 * 5296 * @param source The layout params to copy from. 5297 */ 5298 public LayoutParams(LayoutParams source) { 5299 this.width = source.width; 5300 this.height = source.height; 5301 } 5302 5303 /** 5304 * Used internally by MarginLayoutParams. 5305 * @hide 5306 */ 5307 LayoutParams() { 5308 } 5309 5310 /** 5311 * Extracts the layout parameters from the supplied attributes. 5312 * 5313 * @param a the style attributes to extract the parameters from 5314 * @param widthAttr the identifier of the width attribute 5315 * @param heightAttr the identifier of the height attribute 5316 */ 5317 protected void setBaseAttributes(TypedArray a, int widthAttr, int heightAttr) { 5318 width = a.getLayoutDimension(widthAttr, "layout_width"); 5319 height = a.getLayoutDimension(heightAttr, "layout_height"); 5320 } 5321 5322 /** 5323 * Resolve layout parameters depending on the layout direction. Subclasses that care about 5324 * layoutDirection changes should override this method. The default implementation does 5325 * nothing. 5326 * 5327 * @param layoutDirection the direction of the layout 5328 * 5329 * {@link View#LAYOUT_DIRECTION_LTR} 5330 * {@link View#LAYOUT_DIRECTION_RTL} 5331 * 5332 * @hide 5333 */ 5334 protected void resolveWithDirection(int layoutDirection) { 5335 } 5336 5337 /** 5338 * Returns a String representation of this set of layout parameters. 5339 * 5340 * @param output the String to prepend to the internal representation 5341 * @return a String with the following format: output + 5342 * "ViewGroup.LayoutParams={ width=WIDTH, height=HEIGHT }" 5343 * 5344 * @hide 5345 */ 5346 public String debug(String output) { 5347 return output + "ViewGroup.LayoutParams={ width=" 5348 + sizeToString(width) + ", height=" + sizeToString(height) + " }"; 5349 } 5350 5351 /** 5352 * Converts the specified size to a readable String. 5353 * 5354 * @param size the size to convert 5355 * @return a String instance representing the supplied size 5356 * 5357 * @hide 5358 */ 5359 protected static String sizeToString(int size) { 5360 if (size == WRAP_CONTENT) { 5361 return "wrap-content"; 5362 } 5363 if (size == MATCH_PARENT) { 5364 return "match-parent"; 5365 } 5366 return String.valueOf(size); 5367 } 5368 } 5369 5370 /** 5371 * Per-child layout information for layouts that support margins. 5372 * See 5373 * {@link android.R.styleable#ViewGroup_MarginLayout ViewGroup Margin Layout Attributes} 5374 * for a list of all child view attributes that this class supports. 5375 */ 5376 public static class MarginLayoutParams extends ViewGroup.LayoutParams { 5377 /** 5378 * The left margin in pixels of the child. Whenever this value is changed, a call to 5379 * {@link android.view.View#requestLayout()} needs to be done. 5380 */ 5381 @ViewDebug.ExportedProperty(category = "layout") 5382 public int leftMargin; 5383 5384 /** 5385 * The top margin in pixels of the child. Whenever this value is changed, a call to 5386 * {@link android.view.View#requestLayout()} needs to be done. 5387 */ 5388 @ViewDebug.ExportedProperty(category = "layout") 5389 public int topMargin; 5390 5391 /** 5392 * The right margin in pixels of the child. Whenever this value is changed, a call to 5393 * {@link android.view.View#requestLayout()} needs to be done. 5394 */ 5395 @ViewDebug.ExportedProperty(category = "layout") 5396 public int rightMargin; 5397 5398 /** 5399 * The bottom margin in pixels of the child. Whenever this value is changed, a call to 5400 * {@link android.view.View#requestLayout()} needs to be done. 5401 */ 5402 @ViewDebug.ExportedProperty(category = "layout") 5403 public int bottomMargin; 5404 5405 /** 5406 * The start margin in pixels of the child. 5407 * 5408 * @hide 5409 * 5410 */ 5411 @ViewDebug.ExportedProperty(category = "layout") 5412 protected int startMargin = DEFAULT_RELATIVE; 5413 5414 /** 5415 * The end margin in pixels of the child. 5416 * 5417 * @hide 5418 */ 5419 @ViewDebug.ExportedProperty(category = "layout") 5420 protected int endMargin = DEFAULT_RELATIVE; 5421 5422 /** 5423 * The default start and end margin. 5424 */ 5425 static private final int DEFAULT_RELATIVE = Integer.MIN_VALUE; 5426 5427 /** 5428 * Creates a new set of layout parameters. The values are extracted from 5429 * the supplied attributes set and context. 5430 * 5431 * @param c the application environment 5432 * @param attrs the set of attributes from which to extract the layout 5433 * parameters' values 5434 */ 5435 public MarginLayoutParams(Context c, AttributeSet attrs) { 5436 super(); 5437 5438 TypedArray a = c.obtainStyledAttributes(attrs, R.styleable.ViewGroup_MarginLayout); 5439 setBaseAttributes(a, 5440 R.styleable.ViewGroup_MarginLayout_layout_width, 5441 R.styleable.ViewGroup_MarginLayout_layout_height); 5442 5443 int margin = a.getDimensionPixelSize( 5444 com.android.internal.R.styleable.ViewGroup_MarginLayout_layout_margin, -1); 5445 if (margin >= 0) { 5446 leftMargin = margin; 5447 topMargin = margin; 5448 rightMargin= margin; 5449 bottomMargin = margin; 5450 } else { 5451 leftMargin = a.getDimensionPixelSize( 5452 R.styleable.ViewGroup_MarginLayout_layout_marginLeft, 0); 5453 topMargin = a.getDimensionPixelSize( 5454 R.styleable.ViewGroup_MarginLayout_layout_marginTop, 0); 5455 rightMargin = a.getDimensionPixelSize( 5456 R.styleable.ViewGroup_MarginLayout_layout_marginRight, 0); 5457 bottomMargin = a.getDimensionPixelSize( 5458 R.styleable.ViewGroup_MarginLayout_layout_marginBottom, 0); 5459 startMargin = a.getDimensionPixelSize( 5460 R.styleable.ViewGroup_MarginLayout_layout_marginStart, DEFAULT_RELATIVE); 5461 endMargin = a.getDimensionPixelSize( 5462 R.styleable.ViewGroup_MarginLayout_layout_marginEnd, DEFAULT_RELATIVE); 5463 } 5464 5465 a.recycle(); 5466 } 5467 5468 /** 5469 * {@inheritDoc} 5470 */ 5471 public MarginLayoutParams(int width, int height) { 5472 super(width, height); 5473 } 5474 5475 /** 5476 * Copy constructor. Clones the width, height and margin values of the source. 5477 * 5478 * @param source The layout params to copy from. 5479 */ 5480 public MarginLayoutParams(MarginLayoutParams source) { 5481 this.width = source.width; 5482 this.height = source.height; 5483 5484 this.leftMargin = source.leftMargin; 5485 this.topMargin = source.topMargin; 5486 this.rightMargin = source.rightMargin; 5487 this.bottomMargin = source.bottomMargin; 5488 this.startMargin = source.startMargin; 5489 this.endMargin = source.endMargin; 5490 } 5491 5492 /** 5493 * {@inheritDoc} 5494 */ 5495 public MarginLayoutParams(LayoutParams source) { 5496 super(source); 5497 } 5498 5499 /** 5500 * Sets the margins, in pixels. A call to {@link android.view.View#requestLayout()} needs 5501 * to be done so that the new margins are taken into account. Left and right margins may be 5502 * overriden by {@link android.view.View#requestLayout()} depending on layout direction. 5503 * 5504 * @param left the left margin size 5505 * @param top the top margin size 5506 * @param right the right margin size 5507 * @param bottom the bottom margin size 5508 * 5509 * @attr ref android.R.styleable#ViewGroup_MarginLayout_layout_marginLeft 5510 * @attr ref android.R.styleable#ViewGroup_MarginLayout_layout_marginTop 5511 * @attr ref android.R.styleable#ViewGroup_MarginLayout_layout_marginRight 5512 * @attr ref android.R.styleable#ViewGroup_MarginLayout_layout_marginBottom 5513 */ 5514 public void setMargins(int left, int top, int right, int bottom) { 5515 leftMargin = left; 5516 topMargin = top; 5517 rightMargin = right; 5518 bottomMargin = bottom; 5519 } 5520 5521 /** 5522 * Sets the relative margins, in pixels. A call to {@link android.view.View#requestLayout()} 5523 * needs to be done so that the new relative margins are taken into account. Left and right 5524 * margins may be overriden by {@link android.view.View#requestLayout()} depending on layout 5525 * direction. 5526 * 5527 * @param start the start margin size 5528 * @param top the top margin size 5529 * @param end the right margin size 5530 * @param bottom the bottom margin size 5531 * 5532 * @attr ref android.R.styleable#ViewGroup_MarginLayout_layout_marginStart 5533 * @attr ref android.R.styleable#ViewGroup_MarginLayout_layout_marginTop 5534 * @attr ref android.R.styleable#ViewGroup_MarginLayout_layout_marginEnd 5535 * @attr ref android.R.styleable#ViewGroup_MarginLayout_layout_marginBottom 5536 * 5537 * @hide 5538 */ 5539 public void setMarginsRelative(int start, int top, int end, int bottom) { 5540 startMargin = start; 5541 topMargin = top; 5542 endMargin = end; 5543 bottomMargin = bottom; 5544 } 5545 5546 /** 5547 * Returns the start margin in pixels. 5548 * 5549 * @attr ref android.R.styleable#ViewGroup_MarginLayout_layout_marginStart 5550 * 5551 * @return the start margin in pixels. 5552 * 5553 * @hide 5554 */ 5555 public int getMarginStart() { 5556 return startMargin; 5557 } 5558 5559 /** 5560 * Returns the end margin in pixels. 5561 * 5562 * @attr ref android.R.styleable#ViewGroup_MarginLayout_layout_marginEnd 5563 * 5564 * @return the end margin in pixels. 5565 * 5566 * @hide 5567 */ 5568 public int getMarginEnd() { 5569 return endMargin; 5570 } 5571 5572 /** 5573 * Check if margins are relative. 5574 * 5575 * @attr ref android.R.styleable#ViewGroup_MarginLayout_layout_marginStart 5576 * @attr ref android.R.styleable#ViewGroup_MarginLayout_layout_marginEnd 5577 * 5578 * @return true if either marginStart or marginEnd has been set 5579 * 5580 * @hide 5581 */ 5582 public boolean isMarginRelative() { 5583 return (startMargin != DEFAULT_RELATIVE) || (endMargin != DEFAULT_RELATIVE); 5584 } 5585 5586 /** 5587 * This will be called by {@link android.view.View#requestLayout()}. Left and Right margins 5588 * maybe overriden depending on layout direction. 5589 * 5590 * @hide 5591 */ 5592 @Override 5593 protected void resolveWithDirection(int layoutDirection) { 5594 switch(layoutDirection) { 5595 case View.LAYOUT_DIRECTION_RTL: 5596 leftMargin = (endMargin > DEFAULT_RELATIVE) ? endMargin : leftMargin; 5597 rightMargin = (startMargin > DEFAULT_RELATIVE) ? startMargin : rightMargin; 5598 break; 5599 case View.LAYOUT_DIRECTION_LTR: 5600 default: 5601 leftMargin = (startMargin > DEFAULT_RELATIVE) ? startMargin : leftMargin; 5602 rightMargin = (endMargin > DEFAULT_RELATIVE) ? endMargin : rightMargin; 5603 break; 5604 } 5605 } 5606 } 5607 5608 /* Describes a touched view and the ids of the pointers that it has captured. 5609 * 5610 * This code assumes that pointer ids are always in the range 0..31 such that 5611 * it can use a bitfield to track which pointer ids are present. 5612 * As it happens, the lower layers of the input dispatch pipeline also use the 5613 * same trick so the assumption should be safe here... 5614 */ 5615 private static final class TouchTarget { 5616 private static final int MAX_RECYCLED = 32; 5617 private static final Object sRecycleLock = new Object(); 5618 private static TouchTarget sRecycleBin; 5619 private static int sRecycledCount; 5620 5621 public static final int ALL_POINTER_IDS = -1; // all ones 5622 5623 // The touched child view. 5624 public View child; 5625 5626 // The combined bit mask of pointer ids for all pointers captured by the target. 5627 public int pointerIdBits; 5628 5629 // The next target in the target list. 5630 public TouchTarget next; 5631 5632 private TouchTarget() { 5633 } 5634 5635 public static TouchTarget obtain(View child, int pointerIdBits) { 5636 final TouchTarget target; 5637 synchronized (sRecycleLock) { 5638 if (sRecycleBin == null) { 5639 target = new TouchTarget(); 5640 } else { 5641 target = sRecycleBin; 5642 sRecycleBin = target.next; 5643 sRecycledCount--; 5644 target.next = null; 5645 } 5646 } 5647 target.child = child; 5648 target.pointerIdBits = pointerIdBits; 5649 return target; 5650 } 5651 5652 public void recycle() { 5653 synchronized (sRecycleLock) { 5654 if (sRecycledCount < MAX_RECYCLED) { 5655 next = sRecycleBin; 5656 sRecycleBin = this; 5657 sRecycledCount += 1; 5658 } else { 5659 next = null; 5660 } 5661 child = null; 5662 } 5663 } 5664 } 5665 5666 /* Describes a hovered view. */ 5667 private static final class HoverTarget { 5668 private static final int MAX_RECYCLED = 32; 5669 private static final Object sRecycleLock = new Object(); 5670 private static HoverTarget sRecycleBin; 5671 private static int sRecycledCount; 5672 5673 // The hovered child view. 5674 public View child; 5675 5676 // The next target in the target list. 5677 public HoverTarget next; 5678 5679 private HoverTarget() { 5680 } 5681 5682 public static HoverTarget obtain(View child) { 5683 final HoverTarget target; 5684 synchronized (sRecycleLock) { 5685 if (sRecycleBin == null) { 5686 target = new HoverTarget(); 5687 } else { 5688 target = sRecycleBin; 5689 sRecycleBin = target.next; 5690 sRecycledCount--; 5691 target.next = null; 5692 } 5693 } 5694 target.child = child; 5695 return target; 5696 } 5697 5698 public void recycle() { 5699 synchronized (sRecycleLock) { 5700 if (sRecycledCount < MAX_RECYCLED) { 5701 next = sRecycleBin; 5702 sRecycleBin = this; 5703 sRecycledCount += 1; 5704 } else { 5705 next = null; 5706 } 5707 child = null; 5708 } 5709 } 5710 } 5711 } 5712