ViewGroup.java revision 76f287e416ded85734b610f316e38d243d2ddb09
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 17package android.view; 18 19import android.animation.LayoutTransition; 20import android.content.Context; 21import android.content.res.Configuration; 22import android.content.res.TypedArray; 23import android.graphics.Bitmap; 24import android.graphics.Canvas; 25import android.graphics.Matrix; 26import android.graphics.Paint; 27import android.graphics.PointF; 28import android.graphics.Rect; 29import android.graphics.RectF; 30import android.graphics.Region; 31import android.os.Build; 32import android.os.Parcelable; 33import android.os.SystemClock; 34import android.util.AttributeSet; 35import android.util.Log; 36import android.util.SparseArray; 37import android.view.accessibility.AccessibilityEvent; 38import android.view.accessibility.AccessibilityNodeInfo; 39import android.view.animation.Animation; 40import android.view.animation.AnimationUtils; 41import android.view.animation.LayoutAnimationController; 42import android.view.animation.Transformation; 43 44import com.android.internal.R; 45import com.android.internal.util.Predicate; 46 47import java.util.ArrayList; 48import java.util.Collections; 49import java.util.HashSet; 50 51/** 52 * <p> 53 * A <code>ViewGroup</code> is a special view that can contain other views 54 * (called children.) The view group is the base class for layouts and views 55 * containers. This class also defines the 56 * {@link android.view.ViewGroup.LayoutParams} class which serves as the base 57 * class for layouts parameters. 58 * </p> 59 * 60 * <p> 61 * Also see {@link LayoutParams} for layout attributes. 62 * </p> 63 * 64 * <div class="special reference"> 65 * <h3>Developer Guides</h3> 66 * <p>For more information about creating user interface layouts, read the 67 * <a href="{@docRoot}guide/topics/ui/declaring-layout.html">XML Layouts</a> developer 68 * guide.</p></div> 69 * 70 * @attr ref android.R.styleable#ViewGroup_clipChildren 71 * @attr ref android.R.styleable#ViewGroup_clipToPadding 72 * @attr ref android.R.styleable#ViewGroup_layoutAnimation 73 * @attr ref android.R.styleable#ViewGroup_animationCache 74 * @attr ref android.R.styleable#ViewGroup_persistentDrawingCache 75 * @attr ref android.R.styleable#ViewGroup_alwaysDrawnWithCache 76 * @attr ref android.R.styleable#ViewGroup_addStatesFromChildren 77 * @attr ref android.R.styleable#ViewGroup_descendantFocusability 78 * @attr ref android.R.styleable#ViewGroup_animateLayoutChanges 79 */ 80public abstract class ViewGroup extends View implements ViewParent, ViewManager { 81 private static final String TAG = "ViewGroup"; 82 83 private static final boolean DBG = false; 84 85 /** 86 * Views which have been hidden or removed which need to be animated on 87 * their way out. 88 * This field should be made private, so it is hidden from the SDK. 89 * {@hide} 90 */ 91 protected ArrayList<View> mDisappearingChildren; 92 93 /** 94 * Listener used to propagate events indicating when children are added 95 * and/or removed from a view group. 96 * This field should be made private, so it is hidden from the SDK. 97 * {@hide} 98 */ 99 protected OnHierarchyChangeListener mOnHierarchyChangeListener; 100 101 // The view contained within this ViewGroup that has or contains focus. 102 private View mFocused; 103 104 /** 105 * A Transformation used when drawing children, to 106 * apply on the child being drawn. 107 */ 108 final Transformation mChildTransformation = new Transformation(); 109 110 /** 111 * Used to track the current invalidation region. 112 */ 113 RectF mInvalidateRegion; 114 115 /** 116 * A Transformation used to calculate a correct 117 * invalidation area when the application is autoscaled. 118 */ 119 Transformation mInvalidationTransformation; 120 121 // View currently under an ongoing drag 122 private View mCurrentDragView; 123 124 // Metadata about the ongoing drag 125 private DragEvent mCurrentDrag; 126 private HashSet<View> mDragNotifiedChildren; 127 128 // Does this group have a child that can accept the current drag payload? 129 private boolean mChildAcceptsDrag; 130 131 // Used during drag dispatch 132 private final PointF mLocalPoint = new PointF(); 133 134 // Layout animation 135 private LayoutAnimationController mLayoutAnimationController; 136 private Animation.AnimationListener mAnimationListener; 137 138 // First touch target in the linked list of touch targets. 139 private TouchTarget mFirstTouchTarget; 140 141 // For debugging only. You can see these in hierarchyviewer. 142 @SuppressWarnings({"FieldCanBeLocal", "UnusedDeclaration"}) 143 @ViewDebug.ExportedProperty(category = "events") 144 private long mLastTouchDownTime; 145 @ViewDebug.ExportedProperty(category = "events") 146 private int mLastTouchDownIndex = -1; 147 @SuppressWarnings({"FieldCanBeLocal", "UnusedDeclaration"}) 148 @ViewDebug.ExportedProperty(category = "events") 149 private float mLastTouchDownX; 150 @SuppressWarnings({"FieldCanBeLocal", "UnusedDeclaration"}) 151 @ViewDebug.ExportedProperty(category = "events") 152 private float mLastTouchDownY; 153 154 // First hover target in the linked list of hover targets. 155 // The hover targets are children which have received ACTION_HOVER_ENTER. 156 // They might not have actually handled the hover event, but we will 157 // continue sending hover events to them as long as the pointer remains over 158 // their bounds and the view group does not intercept hover. 159 private HoverTarget mFirstHoverTarget; 160 161 // True if the view group itself received a hover event. 162 // It might not have actually handled the hover event. 163 private boolean mHoveredSelf; 164 165 /** 166 * Internal flags. 167 * 168 * This field should be made private, so it is hidden from the SDK. 169 * {@hide} 170 */ 171 protected int mGroupFlags; 172 173 /* 174 * THe layout mode: either {@link #UNDEFINED_LAYOUT_MODE}, {@link #COMPONENT_BOUNDS} or 175 * {@link #LAYOUT_BOUNDS} 176 */ 177 private int mLayoutMode = UNDEFINED_LAYOUT_MODE; 178 179 /** 180 * NOTE: If you change the flags below make sure to reflect the changes 181 * the DisplayList class 182 */ 183 184 // When set, ViewGroup invalidates only the child's rectangle 185 // Set by default 186 static final int FLAG_CLIP_CHILDREN = 0x1; 187 188 // When set, ViewGroup excludes the padding area from the invalidate rectangle 189 // Set by default 190 private static final int FLAG_CLIP_TO_PADDING = 0x2; 191 192 // When set, dispatchDraw() will invoke invalidate(); this is set by drawChild() when 193 // a child needs to be invalidated and FLAG_OPTIMIZE_INVALIDATE is set 194 static final int FLAG_INVALIDATE_REQUIRED = 0x4; 195 196 // When set, dispatchDraw() will run the layout animation and unset the flag 197 private static final int FLAG_RUN_ANIMATION = 0x8; 198 199 // When set, there is either no layout animation on the ViewGroup or the layout 200 // animation is over 201 // Set by default 202 static final int FLAG_ANIMATION_DONE = 0x10; 203 204 // If set, this ViewGroup has padding; if unset there is no padding and we don't need 205 // to clip it, even if FLAG_CLIP_TO_PADDING is set 206 private static final int FLAG_PADDING_NOT_NULL = 0x20; 207 208 // When set, this ViewGroup caches its children in a Bitmap before starting a layout animation 209 // Set by default 210 private static final int FLAG_ANIMATION_CACHE = 0x40; 211 212 // When set, this ViewGroup converts calls to invalidate(Rect) to invalidate() during a 213 // layout animation; this avoid clobbering the hierarchy 214 // Automatically set when the layout animation starts, depending on the animation's 215 // characteristics 216 static final int FLAG_OPTIMIZE_INVALIDATE = 0x80; 217 218 // When set, the next call to drawChild() will clear mChildTransformation's matrix 219 static final int FLAG_CLEAR_TRANSFORMATION = 0x100; 220 221 // When set, this ViewGroup invokes mAnimationListener.onAnimationEnd() and removes 222 // the children's Bitmap caches if necessary 223 // This flag is set when the layout animation is over (after FLAG_ANIMATION_DONE is set) 224 private static final int FLAG_NOTIFY_ANIMATION_LISTENER = 0x200; 225 226 /** 227 * When set, the drawing method will call {@link #getChildDrawingOrder(int, int)} 228 * to get the index of the child to draw for that iteration. 229 * 230 * @hide 231 */ 232 protected static final int FLAG_USE_CHILD_DRAWING_ORDER = 0x400; 233 234 /** 235 * When set, this ViewGroup supports static transformations on children; this causes 236 * {@link #getChildStaticTransformation(View, android.view.animation.Transformation)} to be 237 * invoked when a child is drawn. 238 * 239 * Any subclass overriding 240 * {@link #getChildStaticTransformation(View, android.view.animation.Transformation)} should 241 * set this flags in {@link #mGroupFlags}. 242 * 243 * {@hide} 244 */ 245 protected static final int FLAG_SUPPORT_STATIC_TRANSFORMATIONS = 0x800; 246 247 // When the previous drawChild() invocation used an alpha value that was lower than 248 // 1.0 and set it in mCachePaint 249 static final int FLAG_ALPHA_LOWER_THAN_ONE = 0x1000; 250 251 /** 252 * When set, this ViewGroup's drawable states also include those 253 * of its children. 254 */ 255 private static final int FLAG_ADD_STATES_FROM_CHILDREN = 0x2000; 256 257 /** 258 * When set, this ViewGroup tries to always draw its children using their drawing cache. 259 */ 260 static final int FLAG_ALWAYS_DRAWN_WITH_CACHE = 0x4000; 261 262 /** 263 * When set, and if FLAG_ALWAYS_DRAWN_WITH_CACHE is not set, this ViewGroup will try to 264 * draw its children with their drawing cache. 265 */ 266 static final int FLAG_CHILDREN_DRAWN_WITH_CACHE = 0x8000; 267 268 /** 269 * When set, this group will go through its list of children to notify them of 270 * any drawable state change. 271 */ 272 private static final int FLAG_NOTIFY_CHILDREN_ON_DRAWABLE_STATE_CHANGE = 0x10000; 273 274 private static final int FLAG_MASK_FOCUSABILITY = 0x60000; 275 276 /** 277 * This view will get focus before any of its descendants. 278 */ 279 public static final int FOCUS_BEFORE_DESCENDANTS = 0x20000; 280 281 /** 282 * This view will get focus only if none of its descendants want it. 283 */ 284 public static final int FOCUS_AFTER_DESCENDANTS = 0x40000; 285 286 /** 287 * This view will block any of its descendants from getting focus, even 288 * if they are focusable. 289 */ 290 public static final int FOCUS_BLOCK_DESCENDANTS = 0x60000; 291 292 /** 293 * Used to map between enum in attrubutes and flag values. 294 */ 295 private static final int[] DESCENDANT_FOCUSABILITY_FLAGS = 296 {FOCUS_BEFORE_DESCENDANTS, FOCUS_AFTER_DESCENDANTS, 297 FOCUS_BLOCK_DESCENDANTS}; 298 299 /** 300 * When set, this ViewGroup should not intercept touch events. 301 * {@hide} 302 */ 303 protected static final int FLAG_DISALLOW_INTERCEPT = 0x80000; 304 305 /** 306 * When set, this ViewGroup will split MotionEvents to multiple child Views when appropriate. 307 */ 308 private static final int FLAG_SPLIT_MOTION_EVENTS = 0x200000; 309 310 /** 311 * When set, this ViewGroup will not dispatch onAttachedToWindow calls 312 * to children when adding new views. This is used to prevent multiple 313 * onAttached calls when a ViewGroup adds children in its own onAttached method. 314 */ 315 private static final int FLAG_PREVENT_DISPATCH_ATTACHED_TO_WINDOW = 0x400000; 316 317 /** 318 * Indicates which types of drawing caches are to be kept in memory. 319 * This field should be made private, so it is hidden from the SDK. 320 * {@hide} 321 */ 322 protected int mPersistentDrawingCache; 323 324 /** 325 * Used to indicate that no drawing cache should be kept in memory. 326 */ 327 public static final int PERSISTENT_NO_CACHE = 0x0; 328 329 /** 330 * Used to indicate that the animation drawing cache should be kept in memory. 331 */ 332 public static final int PERSISTENT_ANIMATION_CACHE = 0x1; 333 334 /** 335 * Used to indicate that the scrolling drawing cache should be kept in memory. 336 */ 337 public static final int PERSISTENT_SCROLLING_CACHE = 0x2; 338 339 /** 340 * Used to indicate that all drawing caches should be kept in memory. 341 */ 342 public static final int PERSISTENT_ALL_CACHES = 0x3; 343 344 // Layout Modes 345 346 private static final int UNDEFINED_LAYOUT_MODE = -1; 347 348 /** 349 * This constant is a {@link #setLayoutMode(int) layoutMode}. 350 * Component bounds are the raw values of {@link #getLeft() left}, {@link #getTop() top}, 351 * {@link #getRight() right} and {@link #getBottom() bottom}. 352 */ 353 public static final int COMPONENT_BOUNDS = 0; 354 355 /** 356 * This constant is a {@link #setLayoutMode(int) layoutMode}. 357 */ 358 public static final int LAYOUT_BOUNDS = 1; 359 360 /** 361 * We clip to padding when FLAG_CLIP_TO_PADDING and FLAG_PADDING_NOT_NULL 362 * are set at the same time. 363 */ 364 protected static final int CLIP_TO_PADDING_MASK = FLAG_CLIP_TO_PADDING | FLAG_PADDING_NOT_NULL; 365 366 // Index of the child's left position in the mLocation array 367 private static final int CHILD_LEFT_INDEX = 0; 368 // Index of the child's top position in the mLocation array 369 private static final int CHILD_TOP_INDEX = 1; 370 371 // Child views of this ViewGroup 372 private View[] mChildren; 373 // Number of valid children in the mChildren array, the rest should be null or not 374 // considered as children 375 376 private boolean mLayoutSuppressed = false; 377 378 private int mChildrenCount; 379 380 private static final int ARRAY_INITIAL_CAPACITY = 12; 381 private static final int ARRAY_CAPACITY_INCREMENT = 12; 382 383 // Used to draw cached views 384 Paint mCachePaint; 385 386 // Used to animate add/remove changes in layout 387 private LayoutTransition mTransition; 388 389 // The set of views that are currently being transitioned. This list is used to track views 390 // being removed that should not actually be removed from the parent yet because they are 391 // being animated. 392 private ArrayList<View> mTransitioningViews; 393 394 // List of children changing visibility. This is used to potentially keep rendering 395 // views during a transition when they otherwise would have become gone/invisible 396 private ArrayList<View> mVisibilityChangingChildren; 397 398 // Indicates whether this container will use its children layers to draw 399 @ViewDebug.ExportedProperty(category = "drawing") 400 boolean mDrawLayers = true; 401 402 // Indicates how many of this container's child subtrees contain transient state 403 @ViewDebug.ExportedProperty(category = "layout") 404 private int mChildCountWithTransientState = 0; 405 406 public ViewGroup(Context context) { 407 super(context); 408 initViewGroup(); 409 } 410 411 public ViewGroup(Context context, AttributeSet attrs) { 412 super(context, attrs); 413 initViewGroup(); 414 initFromAttributes(context, attrs); 415 } 416 417 public ViewGroup(Context context, AttributeSet attrs, int defStyle) { 418 super(context, attrs, defStyle); 419 initViewGroup(); 420 initFromAttributes(context, attrs); 421 } 422 423 private void initViewGroup() { 424 // ViewGroup doesn't draw by default 425 setFlags(WILL_NOT_DRAW, DRAW_MASK); 426 mGroupFlags |= FLAG_CLIP_CHILDREN; 427 mGroupFlags |= FLAG_CLIP_TO_PADDING; 428 mGroupFlags |= FLAG_ANIMATION_DONE; 429 mGroupFlags |= FLAG_ANIMATION_CACHE; 430 mGroupFlags |= FLAG_ALWAYS_DRAWN_WITH_CACHE; 431 432 if (mContext.getApplicationInfo().targetSdkVersion >= Build.VERSION_CODES.HONEYCOMB) { 433 mGroupFlags |= FLAG_SPLIT_MOTION_EVENTS; 434 } 435 436 setDescendantFocusability(FOCUS_BEFORE_DESCENDANTS); 437 438 mChildren = new View[ARRAY_INITIAL_CAPACITY]; 439 mChildrenCount = 0; 440 441 mPersistentDrawingCache = PERSISTENT_SCROLLING_CACHE; 442 } 443 444 private void initFromAttributes(Context context, AttributeSet attrs) { 445 TypedArray a = context.obtainStyledAttributes(attrs, 446 R.styleable.ViewGroup); 447 448 final int N = a.getIndexCount(); 449 for (int i = 0; i < N; i++) { 450 int attr = a.getIndex(i); 451 switch (attr) { 452 case R.styleable.ViewGroup_clipChildren: 453 setClipChildren(a.getBoolean(attr, true)); 454 break; 455 case R.styleable.ViewGroup_clipToPadding: 456 setClipToPadding(a.getBoolean(attr, true)); 457 break; 458 case R.styleable.ViewGroup_animationCache: 459 setAnimationCacheEnabled(a.getBoolean(attr, true)); 460 break; 461 case R.styleable.ViewGroup_persistentDrawingCache: 462 setPersistentDrawingCache(a.getInt(attr, PERSISTENT_SCROLLING_CACHE)); 463 break; 464 case R.styleable.ViewGroup_addStatesFromChildren: 465 setAddStatesFromChildren(a.getBoolean(attr, false)); 466 break; 467 case R.styleable.ViewGroup_alwaysDrawnWithCache: 468 setAlwaysDrawnWithCacheEnabled(a.getBoolean(attr, true)); 469 break; 470 case R.styleable.ViewGroup_layoutAnimation: 471 int id = a.getResourceId(attr, -1); 472 if (id > 0) { 473 setLayoutAnimation(AnimationUtils.loadLayoutAnimation(mContext, id)); 474 } 475 break; 476 case R.styleable.ViewGroup_descendantFocusability: 477 setDescendantFocusability(DESCENDANT_FOCUSABILITY_FLAGS[a.getInt(attr, 0)]); 478 break; 479 case R.styleable.ViewGroup_splitMotionEvents: 480 setMotionEventSplittingEnabled(a.getBoolean(attr, false)); 481 break; 482 case R.styleable.ViewGroup_animateLayoutChanges: 483 boolean animateLayoutChanges = a.getBoolean(attr, false); 484 if (animateLayoutChanges) { 485 setLayoutTransition(new LayoutTransition()); 486 } 487 break; 488 } 489 } 490 491 a.recycle(); 492 } 493 494 /** 495 * Gets the descendant focusability of this view group. The descendant 496 * focusability defines the relationship between this view group and its 497 * descendants when looking for a view to take focus in 498 * {@link #requestFocus(int, android.graphics.Rect)}. 499 * 500 * @return one of {@link #FOCUS_BEFORE_DESCENDANTS}, {@link #FOCUS_AFTER_DESCENDANTS}, 501 * {@link #FOCUS_BLOCK_DESCENDANTS}. 502 */ 503 @ViewDebug.ExportedProperty(category = "focus", mapping = { 504 @ViewDebug.IntToString(from = FOCUS_BEFORE_DESCENDANTS, to = "FOCUS_BEFORE_DESCENDANTS"), 505 @ViewDebug.IntToString(from = FOCUS_AFTER_DESCENDANTS, to = "FOCUS_AFTER_DESCENDANTS"), 506 @ViewDebug.IntToString(from = FOCUS_BLOCK_DESCENDANTS, to = "FOCUS_BLOCK_DESCENDANTS") 507 }) 508 public int getDescendantFocusability() { 509 return mGroupFlags & FLAG_MASK_FOCUSABILITY; 510 } 511 512 /** 513 * Set the descendant focusability of this view group. This defines the relationship 514 * between this view group and its descendants when looking for a view to 515 * take focus in {@link #requestFocus(int, android.graphics.Rect)}. 516 * 517 * @param focusability one of {@link #FOCUS_BEFORE_DESCENDANTS}, {@link #FOCUS_AFTER_DESCENDANTS}, 518 * {@link #FOCUS_BLOCK_DESCENDANTS}. 519 */ 520 public void setDescendantFocusability(int focusability) { 521 switch (focusability) { 522 case FOCUS_BEFORE_DESCENDANTS: 523 case FOCUS_AFTER_DESCENDANTS: 524 case FOCUS_BLOCK_DESCENDANTS: 525 break; 526 default: 527 throw new IllegalArgumentException("must be one of FOCUS_BEFORE_DESCENDANTS, " 528 + "FOCUS_AFTER_DESCENDANTS, FOCUS_BLOCK_DESCENDANTS"); 529 } 530 mGroupFlags &= ~FLAG_MASK_FOCUSABILITY; 531 mGroupFlags |= (focusability & FLAG_MASK_FOCUSABILITY); 532 } 533 534 /** 535 * {@inheritDoc} 536 */ 537 @Override 538 void handleFocusGainInternal(int direction, Rect previouslyFocusedRect) { 539 if (mFocused != null) { 540 mFocused.unFocus(); 541 mFocused = null; 542 } 543 super.handleFocusGainInternal(direction, previouslyFocusedRect); 544 } 545 546 /** 547 * {@inheritDoc} 548 */ 549 public void requestChildFocus(View child, View focused) { 550 if (DBG) { 551 System.out.println(this + " requestChildFocus()"); 552 } 553 if (getDescendantFocusability() == FOCUS_BLOCK_DESCENDANTS) { 554 return; 555 } 556 557 // Unfocus us, if necessary 558 super.unFocus(); 559 560 // We had a previous notion of who had focus. Clear it. 561 if (mFocused != child) { 562 if (mFocused != null) { 563 mFocused.unFocus(); 564 } 565 566 mFocused = child; 567 } 568 if (mParent != null) { 569 mParent.requestChildFocus(this, focused); 570 } 571 } 572 573 /** 574 * {@inheritDoc} 575 */ 576 public void focusableViewAvailable(View v) { 577 if (mParent != null 578 // shortcut: don't report a new focusable view if we block our descendants from 579 // getting focus 580 && (getDescendantFocusability() != FOCUS_BLOCK_DESCENDANTS) 581 // shortcut: don't report a new focusable view if we already are focused 582 // (and we don't prefer our descendants) 583 // 584 // note: knowing that mFocused is non-null is not a good enough reason 585 // to break the traversal since in that case we'd actually have to find 586 // the focused view and make sure it wasn't FOCUS_AFTER_DESCENDANTS and 587 // an ancestor of v; this will get checked for at ViewAncestor 588 && !(isFocused() && getDescendantFocusability() != FOCUS_AFTER_DESCENDANTS)) { 589 mParent.focusableViewAvailable(v); 590 } 591 } 592 593 /** 594 * {@inheritDoc} 595 */ 596 public boolean showContextMenuForChild(View originalView) { 597 return mParent != null && mParent.showContextMenuForChild(originalView); 598 } 599 600 /** 601 * {@inheritDoc} 602 */ 603 public ActionMode startActionModeForChild(View originalView, ActionMode.Callback callback) { 604 return mParent != null ? mParent.startActionModeForChild(originalView, callback) : null; 605 } 606 607 /** 608 * Find the nearest view in the specified direction that wants to take 609 * focus. 610 * 611 * @param focused The view that currently has focus 612 * @param direction One of FOCUS_UP, FOCUS_DOWN, FOCUS_LEFT, and 613 * FOCUS_RIGHT, or 0 for not applicable. 614 */ 615 public View focusSearch(View focused, int direction) { 616 if (isRootNamespace()) { 617 // root namespace means we should consider ourselves the top of the 618 // tree for focus searching; otherwise we could be focus searching 619 // into other tabs. see LocalActivityManager and TabHost for more info 620 return FocusFinder.getInstance().findNextFocus(this, focused, direction); 621 } else if (mParent != null) { 622 return mParent.focusSearch(focused, direction); 623 } 624 return null; 625 } 626 627 /** 628 * {@inheritDoc} 629 */ 630 public boolean requestChildRectangleOnScreen(View child, Rect rectangle, boolean immediate) { 631 return false; 632 } 633 634 /** 635 * {@inheritDoc} 636 */ 637 @Override 638 public boolean requestSendAccessibilityEvent(View child, AccessibilityEvent event) { 639 ViewParent parent = mParent; 640 if (parent == null) { 641 return false; 642 } 643 final boolean propagate = onRequestSendAccessibilityEvent(child, event); 644 if (!propagate) { 645 return false; 646 } 647 return parent.requestSendAccessibilityEvent(this, event); 648 } 649 650 /** 651 * Called when a child has requested sending an {@link AccessibilityEvent} and 652 * gives an opportunity to its parent to augment the event. 653 * <p> 654 * If an {@link android.view.View.AccessibilityDelegate} has been specified via calling 655 * {@link android.view.View#setAccessibilityDelegate(android.view.View.AccessibilityDelegate)} its 656 * {@link android.view.View.AccessibilityDelegate#onRequestSendAccessibilityEvent(ViewGroup, View, AccessibilityEvent)} 657 * is responsible for handling this call. 658 * </p> 659 * 660 * @param child The child which requests sending the event. 661 * @param event The event to be sent. 662 * @return True if the event should be sent. 663 * 664 * @see #requestSendAccessibilityEvent(View, AccessibilityEvent) 665 */ 666 public boolean onRequestSendAccessibilityEvent(View child, AccessibilityEvent event) { 667 if (mAccessibilityDelegate != null) { 668 return mAccessibilityDelegate.onRequestSendAccessibilityEvent(this, child, event); 669 } else { 670 return onRequestSendAccessibilityEventInternal(child, event); 671 } 672 } 673 674 /** 675 * @see #onRequestSendAccessibilityEvent(View, AccessibilityEvent) 676 * 677 * Note: Called from the default {@link View.AccessibilityDelegate}. 678 */ 679 boolean onRequestSendAccessibilityEventInternal(View child, AccessibilityEvent event) { 680 return true; 681 } 682 683 /** 684 * Called when a child view has changed whether or not it is tracking transient state. 685 * 686 * @hide 687 */ 688 public void childHasTransientStateChanged(View child, boolean childHasTransientState) { 689 final boolean oldHasTransientState = hasTransientState(); 690 if (childHasTransientState) { 691 mChildCountWithTransientState++; 692 } else { 693 mChildCountWithTransientState--; 694 } 695 696 final boolean newHasTransientState = hasTransientState(); 697 if (mParent != null && oldHasTransientState != newHasTransientState) { 698 try { 699 mParent.childHasTransientStateChanged(this, newHasTransientState); 700 } catch (AbstractMethodError e) { 701 Log.e(TAG, mParent.getClass().getSimpleName() + 702 " does not fully implement ViewParent", e); 703 } 704 } 705 } 706 707 /** 708 * @hide 709 */ 710 @Override 711 public boolean hasTransientState() { 712 return mChildCountWithTransientState > 0 || super.hasTransientState(); 713 } 714 715 /** 716 * {@inheritDoc} 717 */ 718 @Override 719 public boolean dispatchUnhandledMove(View focused, int direction) { 720 return mFocused != null && 721 mFocused.dispatchUnhandledMove(focused, direction); 722 } 723 724 /** 725 * {@inheritDoc} 726 */ 727 public void clearChildFocus(View child) { 728 if (DBG) { 729 System.out.println(this + " clearChildFocus()"); 730 } 731 732 mFocused = null; 733 if (mParent != null) { 734 mParent.clearChildFocus(this); 735 } 736 } 737 738 /** 739 * {@inheritDoc} 740 */ 741 @Override 742 public void clearFocus() { 743 if (DBG) { 744 System.out.println(this + " clearFocus()"); 745 } 746 if (mFocused == null) { 747 super.clearFocus(); 748 } else { 749 mFocused.clearFocus(); 750 mFocused = null; 751 } 752 } 753 754 /** 755 * {@inheritDoc} 756 */ 757 @Override 758 void unFocus() { 759 if (DBG) { 760 System.out.println(this + " unFocus()"); 761 } 762 if (mFocused == null) { 763 super.unFocus(); 764 } else { 765 mFocused.unFocus(); 766 mFocused = null; 767 } 768 } 769 770 /** 771 * Returns the focused child of this view, if any. The child may have focus 772 * or contain focus. 773 * 774 * @return the focused child or null. 775 */ 776 public View getFocusedChild() { 777 return mFocused; 778 } 779 780 /** 781 * Returns true if this view has or contains focus 782 * 783 * @return true if this view has or contains focus 784 */ 785 @Override 786 public boolean hasFocus() { 787 return (mPrivateFlags & FOCUSED) != 0 || mFocused != null; 788 } 789 790 /* 791 * (non-Javadoc) 792 * 793 * @see android.view.View#findFocus() 794 */ 795 @Override 796 public View findFocus() { 797 if (DBG) { 798 System.out.println("Find focus in " + this + ": flags=" 799 + isFocused() + ", child=" + mFocused); 800 } 801 802 if (isFocused()) { 803 return this; 804 } 805 806 if (mFocused != null) { 807 return mFocused.findFocus(); 808 } 809 return null; 810 } 811 812 /** 813 * {@inheritDoc} 814 */ 815 @Override 816 public boolean hasFocusable() { 817 if ((mViewFlags & VISIBILITY_MASK) != VISIBLE) { 818 return false; 819 } 820 821 if (isFocusable()) { 822 return true; 823 } 824 825 final int descendantFocusability = getDescendantFocusability(); 826 if (descendantFocusability != FOCUS_BLOCK_DESCENDANTS) { 827 final int count = mChildrenCount; 828 final View[] children = mChildren; 829 830 for (int i = 0; i < count; i++) { 831 final View child = children[i]; 832 if (child.hasFocusable()) { 833 return true; 834 } 835 } 836 } 837 838 return false; 839 } 840 841 /** 842 * {@inheritDoc} 843 */ 844 @Override 845 public void addFocusables(ArrayList<View> views, int direction) { 846 addFocusables(views, direction, FOCUSABLES_TOUCH_MODE); 847 } 848 849 /** 850 * {@inheritDoc} 851 */ 852 @Override 853 public void addFocusables(ArrayList<View> views, int direction, int focusableMode) { 854 final int focusableCount = views.size(); 855 856 final int descendantFocusability = getDescendantFocusability(); 857 858 if (descendantFocusability != FOCUS_BLOCK_DESCENDANTS) { 859 final int count = mChildrenCount; 860 final View[] children = mChildren; 861 862 for (int i = 0; i < count; i++) { 863 final View child = children[i]; 864 if ((child.mViewFlags & VISIBILITY_MASK) == VISIBLE) { 865 child.addFocusables(views, direction, focusableMode); 866 } 867 } 868 } 869 870 // we add ourselves (if focusable) in all cases except for when we are 871 // FOCUS_AFTER_DESCENDANTS and there are some descendants focusable. this is 872 // to avoid the focus search finding layouts when a more precise search 873 // among the focusable children would be more interesting. 874 if ( 875 descendantFocusability != FOCUS_AFTER_DESCENDANTS || 876 // No focusable descendants 877 (focusableCount == views.size())) { 878 super.addFocusables(views, direction, focusableMode); 879 } 880 } 881 882 @Override 883 public void findViewsWithText(ArrayList<View> outViews, CharSequence text, int flags) { 884 super.findViewsWithText(outViews, text, flags); 885 final int childrenCount = mChildrenCount; 886 final View[] children = mChildren; 887 for (int i = 0; i < childrenCount; i++) { 888 View child = children[i]; 889 if ((child.mViewFlags & VISIBILITY_MASK) == VISIBLE 890 && (child.mPrivateFlags & IS_ROOT_NAMESPACE) == 0) { 891 child.findViewsWithText(outViews, text, flags); 892 } 893 } 894 } 895 896 @Override 897 View findViewByAccessibilityIdTraversal(int accessibilityId) { 898 View foundView = super.findViewByAccessibilityIdTraversal(accessibilityId); 899 if (foundView != null) { 900 return foundView; 901 } 902 final int childrenCount = mChildrenCount; 903 final View[] children = mChildren; 904 for (int i = 0; i < childrenCount; i++) { 905 View child = children[i]; 906 foundView = child.findViewByAccessibilityIdTraversal(accessibilityId); 907 if (foundView != null) { 908 return foundView; 909 } 910 } 911 return null; 912 } 913 914 /** 915 * {@inheritDoc} 916 */ 917 @Override 918 public void dispatchWindowFocusChanged(boolean hasFocus) { 919 super.dispatchWindowFocusChanged(hasFocus); 920 final int count = mChildrenCount; 921 final View[] children = mChildren; 922 for (int i = 0; i < count; i++) { 923 children[i].dispatchWindowFocusChanged(hasFocus); 924 } 925 } 926 927 /** 928 * {@inheritDoc} 929 */ 930 @Override 931 public void addTouchables(ArrayList<View> views) { 932 super.addTouchables(views); 933 934 final int count = mChildrenCount; 935 final View[] children = mChildren; 936 937 for (int i = 0; i < count; i++) { 938 final View child = children[i]; 939 if ((child.mViewFlags & VISIBILITY_MASK) == VISIBLE) { 940 child.addTouchables(views); 941 } 942 } 943 } 944 945 /** 946 * @hide 947 */ 948 @Override 949 public void makeOptionalFitsSystemWindows() { 950 super.makeOptionalFitsSystemWindows(); 951 final int count = mChildrenCount; 952 final View[] children = mChildren; 953 for (int i = 0; i < count; i++) { 954 children[i].makeOptionalFitsSystemWindows(); 955 } 956 } 957 958 /** 959 * {@inheritDoc} 960 */ 961 @Override 962 public void dispatchDisplayHint(int hint) { 963 super.dispatchDisplayHint(hint); 964 final int count = mChildrenCount; 965 final View[] children = mChildren; 966 for (int i = 0; i < count; i++) { 967 children[i].dispatchDisplayHint(hint); 968 } 969 } 970 971 /** 972 * Called when a view's visibility has changed. Notify the parent to take any appropriate 973 * action. 974 * 975 * @param child The view whose visibility has changed 976 * @param oldVisibility The previous visibility value (GONE, INVISIBLE, or VISIBLE). 977 * @param newVisibility The new visibility value (GONE, INVISIBLE, or VISIBLE). 978 * @hide 979 */ 980 protected void onChildVisibilityChanged(View child, int oldVisibility, int newVisibility) { 981 if (mTransition != null) { 982 if (newVisibility == VISIBLE) { 983 mTransition.showChild(this, child, oldVisibility); 984 } else { 985 mTransition.hideChild(this, child, newVisibility); 986 // Only track this on disappearing views - appearing views are already visible 987 // and don't need special handling during drawChild() 988 if (mVisibilityChangingChildren == null) { 989 mVisibilityChangingChildren = new ArrayList<View>(); 990 } 991 mVisibilityChangingChildren.add(child); 992 if (mTransitioningViews != null && mTransitioningViews.contains(child)) { 993 addDisappearingView(child); 994 } 995 } 996 } 997 998 // in all cases, for drags 999 if (mCurrentDrag != null) { 1000 if (newVisibility == VISIBLE) { 1001 notifyChildOfDrag(child); 1002 } 1003 } 1004 } 1005 1006 /** 1007 * {@inheritDoc} 1008 */ 1009 @Override 1010 protected void dispatchVisibilityChanged(View changedView, int visibility) { 1011 super.dispatchVisibilityChanged(changedView, visibility); 1012 final int count = mChildrenCount; 1013 final View[] children = mChildren; 1014 for (int i = 0; i < count; i++) { 1015 children[i].dispatchVisibilityChanged(changedView, visibility); 1016 } 1017 } 1018 1019 /** 1020 * {@inheritDoc} 1021 */ 1022 @Override 1023 public void dispatchWindowVisibilityChanged(int visibility) { 1024 super.dispatchWindowVisibilityChanged(visibility); 1025 final int count = mChildrenCount; 1026 final View[] children = mChildren; 1027 for (int i = 0; i < count; i++) { 1028 children[i].dispatchWindowVisibilityChanged(visibility); 1029 } 1030 } 1031 1032 /** 1033 * {@inheritDoc} 1034 */ 1035 @Override 1036 public void dispatchConfigurationChanged(Configuration newConfig) { 1037 super.dispatchConfigurationChanged(newConfig); 1038 final int count = mChildrenCount; 1039 final View[] children = mChildren; 1040 for (int i = 0; i < count; i++) { 1041 children[i].dispatchConfigurationChanged(newConfig); 1042 } 1043 } 1044 1045 /** 1046 * {@inheritDoc} 1047 */ 1048 public void recomputeViewAttributes(View child) { 1049 if (mAttachInfo != null && !mAttachInfo.mRecomputeGlobalAttributes) { 1050 ViewParent parent = mParent; 1051 if (parent != null) parent.recomputeViewAttributes(this); 1052 } 1053 } 1054 1055 @Override 1056 void dispatchCollectViewAttributes(AttachInfo attachInfo, int visibility) { 1057 if ((visibility & VISIBILITY_MASK) == VISIBLE) { 1058 super.dispatchCollectViewAttributes(attachInfo, visibility); 1059 final int count = mChildrenCount; 1060 final View[] children = mChildren; 1061 for (int i = 0; i < count; i++) { 1062 final View child = children[i]; 1063 child.dispatchCollectViewAttributes(attachInfo, 1064 visibility | (child.mViewFlags&VISIBILITY_MASK)); 1065 } 1066 } 1067 } 1068 1069 /** 1070 * {@inheritDoc} 1071 */ 1072 public void bringChildToFront(View child) { 1073 int index = indexOfChild(child); 1074 if (index >= 0) { 1075 removeFromArray(index); 1076 addInArray(child, mChildrenCount); 1077 child.mParent = this; 1078 } 1079 } 1080 1081 /** 1082 * {@inheritDoc} 1083 */ 1084 // TODO: Write real docs 1085 @Override 1086 public boolean dispatchDragEvent(DragEvent event) { 1087 boolean retval = false; 1088 final float tx = event.mX; 1089 final float ty = event.mY; 1090 1091 ViewRootImpl root = getViewRootImpl(); 1092 1093 // Dispatch down the view hierarchy 1094 switch (event.mAction) { 1095 case DragEvent.ACTION_DRAG_STARTED: { 1096 // clear state to recalculate which views we drag over 1097 mCurrentDragView = null; 1098 1099 // Set up our tracking of drag-started notifications 1100 mCurrentDrag = DragEvent.obtain(event); 1101 if (mDragNotifiedChildren == null) { 1102 mDragNotifiedChildren = new HashSet<View>(); 1103 } else { 1104 mDragNotifiedChildren.clear(); 1105 } 1106 1107 // Now dispatch down to our children, caching the responses 1108 mChildAcceptsDrag = false; 1109 final int count = mChildrenCount; 1110 final View[] children = mChildren; 1111 for (int i = 0; i < count; i++) { 1112 final View child = children[i]; 1113 child.mPrivateFlags2 &= ~View.DRAG_MASK; 1114 if (child.getVisibility() == VISIBLE) { 1115 final boolean handled = notifyChildOfDrag(children[i]); 1116 if (handled) { 1117 mChildAcceptsDrag = true; 1118 } 1119 } 1120 } 1121 1122 // Return HANDLED if one of our children can accept the drag 1123 if (mChildAcceptsDrag) { 1124 retval = true; 1125 } 1126 } break; 1127 1128 case DragEvent.ACTION_DRAG_ENDED: { 1129 // Release the bookkeeping now that the drag lifecycle has ended 1130 if (mDragNotifiedChildren != null) { 1131 for (View child : mDragNotifiedChildren) { 1132 // If a child was notified about an ongoing drag, it's told that it's over 1133 child.dispatchDragEvent(event); 1134 child.mPrivateFlags2 &= ~View.DRAG_MASK; 1135 child.refreshDrawableState(); 1136 } 1137 1138 mDragNotifiedChildren.clear(); 1139 mCurrentDrag.recycle(); 1140 mCurrentDrag = null; 1141 } 1142 1143 // We consider drag-ended to have been handled if one of our children 1144 // had offered to handle the drag. 1145 if (mChildAcceptsDrag) { 1146 retval = true; 1147 } 1148 } break; 1149 1150 case DragEvent.ACTION_DRAG_LOCATION: { 1151 // Find the [possibly new] drag target 1152 final View target = findFrontmostDroppableChildAt(event.mX, event.mY, mLocalPoint); 1153 1154 // If we've changed apparent drag target, tell the view root which view 1155 // we're over now [for purposes of the eventual drag-recipient-changed 1156 // notifications to the framework] and tell the new target that the drag 1157 // has entered its bounds. The root will see setDragFocus() calls all 1158 // the way down to the final leaf view that is handling the LOCATION event 1159 // before reporting the new potential recipient to the framework. 1160 if (mCurrentDragView != target) { 1161 root.setDragFocus(target); 1162 1163 final int action = event.mAction; 1164 // If we've dragged off of a child view, send it the EXITED message 1165 if (mCurrentDragView != null) { 1166 final View view = mCurrentDragView; 1167 event.mAction = DragEvent.ACTION_DRAG_EXITED; 1168 view.dispatchDragEvent(event); 1169 view.mPrivateFlags2 &= ~View.DRAG_HOVERED; 1170 view.refreshDrawableState(); 1171 } 1172 mCurrentDragView = target; 1173 1174 // If we've dragged over a new child view, send it the ENTERED message 1175 if (target != null) { 1176 event.mAction = DragEvent.ACTION_DRAG_ENTERED; 1177 target.dispatchDragEvent(event); 1178 target.mPrivateFlags2 |= View.DRAG_HOVERED; 1179 target.refreshDrawableState(); 1180 } 1181 event.mAction = action; // restore the event's original state 1182 } 1183 1184 // Dispatch the actual drag location notice, localized into its coordinates 1185 if (target != null) { 1186 event.mX = mLocalPoint.x; 1187 event.mY = mLocalPoint.y; 1188 1189 retval = target.dispatchDragEvent(event); 1190 1191 event.mX = tx; 1192 event.mY = ty; 1193 } 1194 } break; 1195 1196 /* Entered / exited dispatch 1197 * 1198 * DRAG_ENTERED is not dispatched downwards from ViewGroup. The reason for this is 1199 * that we're about to get the corresponding LOCATION event, which we will use to 1200 * determine which of our children is the new target; at that point we will 1201 * push a DRAG_ENTERED down to the new target child [which may itself be a ViewGroup]. 1202 * 1203 * DRAG_EXITED *is* dispatched all the way down immediately: once we know the 1204 * drag has left this ViewGroup, we know by definition that every contained subview 1205 * is also no longer under the drag point. 1206 */ 1207 1208 case DragEvent.ACTION_DRAG_EXITED: { 1209 if (mCurrentDragView != null) { 1210 final View view = mCurrentDragView; 1211 view.dispatchDragEvent(event); 1212 view.mPrivateFlags2 &= ~View.DRAG_HOVERED; 1213 view.refreshDrawableState(); 1214 1215 mCurrentDragView = null; 1216 } 1217 } break; 1218 1219 case DragEvent.ACTION_DROP: { 1220 if (ViewDebug.DEBUG_DRAG) Log.d(View.VIEW_LOG_TAG, "Drop event: " + event); 1221 View target = findFrontmostDroppableChildAt(event.mX, event.mY, mLocalPoint); 1222 if (target != null) { 1223 if (ViewDebug.DEBUG_DRAG) Log.d(View.VIEW_LOG_TAG, " dispatch drop to " + target); 1224 event.mX = mLocalPoint.x; 1225 event.mY = mLocalPoint.y; 1226 retval = target.dispatchDragEvent(event); 1227 event.mX = tx; 1228 event.mY = ty; 1229 } else { 1230 if (ViewDebug.DEBUG_DRAG) { 1231 Log.d(View.VIEW_LOG_TAG, " not dropped on an accepting view"); 1232 } 1233 } 1234 } break; 1235 } 1236 1237 // If none of our children could handle the event, try here 1238 if (!retval) { 1239 // Call up to the View implementation that dispatches to installed listeners 1240 retval = super.dispatchDragEvent(event); 1241 } 1242 return retval; 1243 } 1244 1245 // Find the frontmost child view that lies under the given point, and calculate 1246 // the position within its own local coordinate system. 1247 View findFrontmostDroppableChildAt(float x, float y, PointF outLocalPoint) { 1248 final int count = mChildrenCount; 1249 final View[] children = mChildren; 1250 for (int i = count - 1; i >= 0; i--) { 1251 final View child = children[i]; 1252 if (!child.canAcceptDrag()) { 1253 continue; 1254 } 1255 1256 if (isTransformedTouchPointInView(x, y, child, outLocalPoint)) { 1257 return child; 1258 } 1259 } 1260 return null; 1261 } 1262 1263 boolean notifyChildOfDrag(View child) { 1264 if (ViewDebug.DEBUG_DRAG) { 1265 Log.d(View.VIEW_LOG_TAG, "Sending drag-started to view: " + child); 1266 } 1267 1268 boolean canAccept = false; 1269 if (! mDragNotifiedChildren.contains(child)) { 1270 mDragNotifiedChildren.add(child); 1271 canAccept = child.dispatchDragEvent(mCurrentDrag); 1272 if (canAccept && !child.canAcceptDrag()) { 1273 child.mPrivateFlags2 |= View.DRAG_CAN_ACCEPT; 1274 child.refreshDrawableState(); 1275 } 1276 } 1277 return canAccept; 1278 } 1279 1280 @Override 1281 public void dispatchWindowSystemUiVisiblityChanged(int visible) { 1282 super.dispatchWindowSystemUiVisiblityChanged(visible); 1283 1284 final int count = mChildrenCount; 1285 final View[] children = mChildren; 1286 for (int i=0; i <count; i++) { 1287 final View child = children[i]; 1288 child.dispatchWindowSystemUiVisiblityChanged(visible); 1289 } 1290 } 1291 1292 @Override 1293 public void dispatchSystemUiVisibilityChanged(int visible) { 1294 super.dispatchSystemUiVisibilityChanged(visible); 1295 1296 final int count = mChildrenCount; 1297 final View[] children = mChildren; 1298 for (int i=0; i <count; i++) { 1299 final View child = children[i]; 1300 child.dispatchSystemUiVisibilityChanged(visible); 1301 } 1302 } 1303 1304 @Override 1305 void updateLocalSystemUiVisibility(int localValue, int localChanges) { 1306 super.updateLocalSystemUiVisibility(localValue, localChanges); 1307 1308 final int count = mChildrenCount; 1309 final View[] children = mChildren; 1310 for (int i=0; i <count; i++) { 1311 final View child = children[i]; 1312 child.updateLocalSystemUiVisibility(localValue, localChanges); 1313 } 1314 } 1315 1316 /** 1317 * {@inheritDoc} 1318 */ 1319 @Override 1320 public boolean dispatchKeyEventPreIme(KeyEvent event) { 1321 if ((mPrivateFlags & (FOCUSED | HAS_BOUNDS)) == (FOCUSED | HAS_BOUNDS)) { 1322 return super.dispatchKeyEventPreIme(event); 1323 } else if (mFocused != null && (mFocused.mPrivateFlags & HAS_BOUNDS) == HAS_BOUNDS) { 1324 return mFocused.dispatchKeyEventPreIme(event); 1325 } 1326 return false; 1327 } 1328 1329 /** 1330 * {@inheritDoc} 1331 */ 1332 @Override 1333 public boolean dispatchKeyEvent(KeyEvent event) { 1334 if (mInputEventConsistencyVerifier != null) { 1335 mInputEventConsistencyVerifier.onKeyEvent(event, 1); 1336 } 1337 1338 if ((mPrivateFlags & (FOCUSED | HAS_BOUNDS)) == (FOCUSED | HAS_BOUNDS)) { 1339 if (super.dispatchKeyEvent(event)) { 1340 return true; 1341 } 1342 } else if (mFocused != null && (mFocused.mPrivateFlags & HAS_BOUNDS) == HAS_BOUNDS) { 1343 if (mFocused.dispatchKeyEvent(event)) { 1344 return true; 1345 } 1346 } 1347 1348 if (mInputEventConsistencyVerifier != null) { 1349 mInputEventConsistencyVerifier.onUnhandledEvent(event, 1); 1350 } 1351 return false; 1352 } 1353 1354 /** 1355 * {@inheritDoc} 1356 */ 1357 @Override 1358 public boolean dispatchKeyShortcutEvent(KeyEvent event) { 1359 if ((mPrivateFlags & (FOCUSED | HAS_BOUNDS)) == (FOCUSED | HAS_BOUNDS)) { 1360 return super.dispatchKeyShortcutEvent(event); 1361 } else if (mFocused != null && (mFocused.mPrivateFlags & HAS_BOUNDS) == HAS_BOUNDS) { 1362 return mFocused.dispatchKeyShortcutEvent(event); 1363 } 1364 return false; 1365 } 1366 1367 /** 1368 * {@inheritDoc} 1369 */ 1370 @Override 1371 public boolean dispatchTrackballEvent(MotionEvent event) { 1372 if (mInputEventConsistencyVerifier != null) { 1373 mInputEventConsistencyVerifier.onTrackballEvent(event, 1); 1374 } 1375 1376 if ((mPrivateFlags & (FOCUSED | HAS_BOUNDS)) == (FOCUSED | HAS_BOUNDS)) { 1377 if (super.dispatchTrackballEvent(event)) { 1378 return true; 1379 } 1380 } else if (mFocused != null && (mFocused.mPrivateFlags & HAS_BOUNDS) == HAS_BOUNDS) { 1381 if (mFocused.dispatchTrackballEvent(event)) { 1382 return true; 1383 } 1384 } 1385 1386 if (mInputEventConsistencyVerifier != null) { 1387 mInputEventConsistencyVerifier.onUnhandledEvent(event, 1); 1388 } 1389 return false; 1390 } 1391 1392 /** 1393 * {@inheritDoc} 1394 */ 1395 @SuppressWarnings({"ConstantConditions"}) 1396 @Override 1397 protected boolean dispatchHoverEvent(MotionEvent event) { 1398 final int action = event.getAction(); 1399 1400 // First check whether the view group wants to intercept the hover event. 1401 final boolean interceptHover = onInterceptHoverEvent(event); 1402 event.setAction(action); // restore action in case it was changed 1403 1404 MotionEvent eventNoHistory = event; 1405 boolean handled = false; 1406 1407 // Send events to the hovered children and build a new list of hover targets until 1408 // one is found that handles the event. 1409 HoverTarget firstOldHoverTarget = mFirstHoverTarget; 1410 mFirstHoverTarget = null; 1411 if (!interceptHover && action != MotionEvent.ACTION_HOVER_EXIT) { 1412 final float x = event.getX(); 1413 final float y = event.getY(); 1414 final int childrenCount = mChildrenCount; 1415 if (childrenCount != 0) { 1416 final View[] children = mChildren; 1417 HoverTarget lastHoverTarget = null; 1418 for (int i = childrenCount - 1; i >= 0; i--) { 1419 final View child = children[i]; 1420 if (!canViewReceivePointerEvents(child) 1421 || !isTransformedTouchPointInView(x, y, child, null)) { 1422 continue; 1423 } 1424 1425 // Obtain a hover target for this child. Dequeue it from the 1426 // old hover target list if the child was previously hovered. 1427 HoverTarget hoverTarget = firstOldHoverTarget; 1428 final boolean wasHovered; 1429 for (HoverTarget predecessor = null; ;) { 1430 if (hoverTarget == null) { 1431 hoverTarget = HoverTarget.obtain(child); 1432 wasHovered = false; 1433 break; 1434 } 1435 1436 if (hoverTarget.child == child) { 1437 if (predecessor != null) { 1438 predecessor.next = hoverTarget.next; 1439 } else { 1440 firstOldHoverTarget = hoverTarget.next; 1441 } 1442 hoverTarget.next = null; 1443 wasHovered = true; 1444 break; 1445 } 1446 1447 predecessor = hoverTarget; 1448 hoverTarget = hoverTarget.next; 1449 } 1450 1451 // Enqueue the hover target onto the new hover target list. 1452 if (lastHoverTarget != null) { 1453 lastHoverTarget.next = hoverTarget; 1454 } else { 1455 lastHoverTarget = hoverTarget; 1456 mFirstHoverTarget = hoverTarget; 1457 } 1458 1459 // Dispatch the event to the child. 1460 if (action == MotionEvent.ACTION_HOVER_ENTER) { 1461 if (!wasHovered) { 1462 // Send the enter as is. 1463 handled |= dispatchTransformedGenericPointerEvent( 1464 event, child); // enter 1465 } 1466 } else if (action == MotionEvent.ACTION_HOVER_MOVE) { 1467 if (!wasHovered) { 1468 // Synthesize an enter from a move. 1469 eventNoHistory = obtainMotionEventNoHistoryOrSelf(eventNoHistory); 1470 eventNoHistory.setAction(MotionEvent.ACTION_HOVER_ENTER); 1471 handled |= dispatchTransformedGenericPointerEvent( 1472 eventNoHistory, child); // enter 1473 eventNoHistory.setAction(action); 1474 1475 handled |= dispatchTransformedGenericPointerEvent( 1476 eventNoHistory, child); // move 1477 } else { 1478 // Send the move as is. 1479 handled |= dispatchTransformedGenericPointerEvent(event, child); 1480 } 1481 } 1482 if (handled) { 1483 break; 1484 } 1485 } 1486 } 1487 } 1488 1489 // Send exit events to all previously hovered children that are no longer hovered. 1490 while (firstOldHoverTarget != null) { 1491 final View child = firstOldHoverTarget.child; 1492 1493 // Exit the old hovered child. 1494 if (action == MotionEvent.ACTION_HOVER_EXIT) { 1495 // Send the exit as is. 1496 handled |= dispatchTransformedGenericPointerEvent( 1497 event, child); // exit 1498 } else { 1499 // Synthesize an exit from a move or enter. 1500 // Ignore the result because hover focus has moved to a different view. 1501 if (action == MotionEvent.ACTION_HOVER_MOVE) { 1502 dispatchTransformedGenericPointerEvent( 1503 event, child); // move 1504 } 1505 eventNoHistory = obtainMotionEventNoHistoryOrSelf(eventNoHistory); 1506 eventNoHistory.setAction(MotionEvent.ACTION_HOVER_EXIT); 1507 dispatchTransformedGenericPointerEvent( 1508 eventNoHistory, child); // exit 1509 eventNoHistory.setAction(action); 1510 } 1511 1512 final HoverTarget nextOldHoverTarget = firstOldHoverTarget.next; 1513 firstOldHoverTarget.recycle(); 1514 firstOldHoverTarget = nextOldHoverTarget; 1515 } 1516 1517 // Send events to the view group itself if no children have handled it. 1518 boolean newHoveredSelf = !handled; 1519 if (newHoveredSelf == mHoveredSelf) { 1520 if (newHoveredSelf) { 1521 // Send event to the view group as before. 1522 handled |= super.dispatchHoverEvent(event); 1523 } 1524 } else { 1525 if (mHoveredSelf) { 1526 // Exit the view group. 1527 if (action == MotionEvent.ACTION_HOVER_EXIT) { 1528 // Send the exit as is. 1529 handled |= super.dispatchHoverEvent(event); // exit 1530 } else { 1531 // Synthesize an exit from a move or enter. 1532 // Ignore the result because hover focus is moving to a different view. 1533 if (action == MotionEvent.ACTION_HOVER_MOVE) { 1534 super.dispatchHoverEvent(event); // move 1535 } 1536 eventNoHistory = obtainMotionEventNoHistoryOrSelf(eventNoHistory); 1537 eventNoHistory.setAction(MotionEvent.ACTION_HOVER_EXIT); 1538 super.dispatchHoverEvent(eventNoHistory); // exit 1539 eventNoHistory.setAction(action); 1540 } 1541 mHoveredSelf = false; 1542 } 1543 1544 if (newHoveredSelf) { 1545 // Enter the view group. 1546 if (action == MotionEvent.ACTION_HOVER_ENTER) { 1547 // Send the enter as is. 1548 handled |= super.dispatchHoverEvent(event); // enter 1549 mHoveredSelf = true; 1550 } else if (action == MotionEvent.ACTION_HOVER_MOVE) { 1551 // Synthesize an enter from a move. 1552 eventNoHistory = obtainMotionEventNoHistoryOrSelf(eventNoHistory); 1553 eventNoHistory.setAction(MotionEvent.ACTION_HOVER_ENTER); 1554 handled |= super.dispatchHoverEvent(eventNoHistory); // enter 1555 eventNoHistory.setAction(action); 1556 1557 handled |= super.dispatchHoverEvent(eventNoHistory); // move 1558 mHoveredSelf = true; 1559 } 1560 } 1561 } 1562 1563 // Recycle the copy of the event that we made. 1564 if (eventNoHistory != event) { 1565 eventNoHistory.recycle(); 1566 } 1567 1568 // Done. 1569 return handled; 1570 } 1571 1572 private void exitHoverTargets() { 1573 if (mHoveredSelf || mFirstHoverTarget != null) { 1574 final long now = SystemClock.uptimeMillis(); 1575 MotionEvent event = MotionEvent.obtain(now, now, 1576 MotionEvent.ACTION_HOVER_EXIT, 0.0f, 0.0f, 0); 1577 event.setSource(InputDevice.SOURCE_TOUCHSCREEN); 1578 dispatchHoverEvent(event); 1579 event.recycle(); 1580 } 1581 } 1582 1583 private void cancelHoverTarget(View view) { 1584 HoverTarget predecessor = null; 1585 HoverTarget target = mFirstHoverTarget; 1586 while (target != null) { 1587 final HoverTarget next = target.next; 1588 if (target.child == view) { 1589 if (predecessor == null) { 1590 mFirstHoverTarget = next; 1591 } else { 1592 predecessor.next = next; 1593 } 1594 target.recycle(); 1595 1596 final long now = SystemClock.uptimeMillis(); 1597 MotionEvent event = MotionEvent.obtain(now, now, 1598 MotionEvent.ACTION_HOVER_EXIT, 0.0f, 0.0f, 0); 1599 event.setSource(InputDevice.SOURCE_TOUCHSCREEN); 1600 view.dispatchHoverEvent(event); 1601 event.recycle(); 1602 return; 1603 } 1604 predecessor = target; 1605 target = next; 1606 } 1607 } 1608 1609 /** @hide */ 1610 @Override 1611 protected boolean hasHoveredChild() { 1612 return mFirstHoverTarget != null; 1613 } 1614 1615 @Override 1616 public void addChildrenForAccessibility(ArrayList<View> childrenForAccessibility) { 1617 ChildListForAccessibility children = ChildListForAccessibility.obtain(this, true); 1618 try { 1619 final int childrenCount = children.getChildCount(); 1620 for (int i = 0; i < childrenCount; i++) { 1621 View child = children.getChildAt(i); 1622 if ((child.mViewFlags & VISIBILITY_MASK) == VISIBLE 1623 && (child.mPrivateFlags & IS_ROOT_NAMESPACE) == 0) { 1624 if (child.includeForAccessibility()) { 1625 childrenForAccessibility.add(child); 1626 } else { 1627 child.addChildrenForAccessibility(childrenForAccessibility); 1628 } 1629 } 1630 } 1631 } finally { 1632 children.recycle(); 1633 } 1634 } 1635 1636 /** 1637 * @hide 1638 */ 1639 @Override 1640 public void childAccessibilityStateChanged(View child) { 1641 if (mParent != null) { 1642 mParent.childAccessibilityStateChanged(child); 1643 } 1644 } 1645 1646 /** 1647 * Implement this method to intercept hover events before they are handled 1648 * by child views. 1649 * <p> 1650 * This method is called before dispatching a hover event to a child of 1651 * the view group or to the view group's own {@link #onHoverEvent} to allow 1652 * the view group a chance to intercept the hover event. 1653 * This method can also be used to watch all pointer motions that occur within 1654 * the bounds of the view group even when the pointer is hovering over 1655 * a child of the view group rather than over the view group itself. 1656 * </p><p> 1657 * The view group can prevent its children from receiving hover events by 1658 * implementing this method and returning <code>true</code> to indicate 1659 * that it would like to intercept hover events. The view group must 1660 * continuously return <code>true</code> from {@link #onInterceptHoverEvent} 1661 * for as long as it wishes to continue intercepting hover events from 1662 * its children. 1663 * </p><p> 1664 * Interception preserves the invariant that at most one view can be 1665 * hovered at a time by transferring hover focus from the currently hovered 1666 * child to the view group or vice-versa as needed. 1667 * </p><p> 1668 * If this method returns <code>true</code> and a child is already hovered, then the 1669 * child view will first receive a hover exit event and then the view group 1670 * itself will receive a hover enter event in {@link #onHoverEvent}. 1671 * Likewise, if this method had previously returned <code>true</code> to intercept hover 1672 * events and instead returns <code>false</code> while the pointer is hovering 1673 * within the bounds of one of a child, then the view group will first receive a 1674 * hover exit event in {@link #onHoverEvent} and then the hovered child will 1675 * receive a hover enter event. 1676 * </p><p> 1677 * The default implementation always returns false. 1678 * </p> 1679 * 1680 * @param event The motion event that describes the hover. 1681 * @return True if the view group would like to intercept the hover event 1682 * and prevent its children from receiving it. 1683 */ 1684 public boolean onInterceptHoverEvent(MotionEvent event) { 1685 return false; 1686 } 1687 1688 private static MotionEvent obtainMotionEventNoHistoryOrSelf(MotionEvent event) { 1689 if (event.getHistorySize() == 0) { 1690 return event; 1691 } 1692 return MotionEvent.obtainNoHistory(event); 1693 } 1694 1695 /** 1696 * {@inheritDoc} 1697 */ 1698 @Override 1699 protected boolean dispatchGenericPointerEvent(MotionEvent event) { 1700 // Send the event to the child under the pointer. 1701 final int childrenCount = mChildrenCount; 1702 if (childrenCount != 0) { 1703 final View[] children = mChildren; 1704 final float x = event.getX(); 1705 final float y = event.getY(); 1706 1707 for (int i = childrenCount - 1; i >= 0; i--) { 1708 final View child = children[i]; 1709 if (!canViewReceivePointerEvents(child) 1710 || !isTransformedTouchPointInView(x, y, child, null)) { 1711 continue; 1712 } 1713 1714 if (dispatchTransformedGenericPointerEvent(event, child)) { 1715 return true; 1716 } 1717 } 1718 } 1719 1720 // No child handled the event. Send it to this view group. 1721 return super.dispatchGenericPointerEvent(event); 1722 } 1723 1724 /** 1725 * {@inheritDoc} 1726 */ 1727 @Override 1728 protected boolean dispatchGenericFocusedEvent(MotionEvent event) { 1729 // Send the event to the focused child or to this view group if it has focus. 1730 if ((mPrivateFlags & (FOCUSED | HAS_BOUNDS)) == (FOCUSED | HAS_BOUNDS)) { 1731 return super.dispatchGenericFocusedEvent(event); 1732 } else if (mFocused != null && (mFocused.mPrivateFlags & HAS_BOUNDS) == HAS_BOUNDS) { 1733 return mFocused.dispatchGenericMotionEvent(event); 1734 } 1735 return false; 1736 } 1737 1738 /** 1739 * Dispatches a generic pointer event to a child, taking into account 1740 * transformations that apply to the child. 1741 * 1742 * @param event The event to send. 1743 * @param child The view to send the event to. 1744 * @return {@code true} if the child handled the event. 1745 */ 1746 private boolean dispatchTransformedGenericPointerEvent(MotionEvent event, View child) { 1747 final float offsetX = mScrollX - child.mLeft; 1748 final float offsetY = mScrollY - child.mTop; 1749 1750 boolean handled; 1751 if (!child.hasIdentityMatrix()) { 1752 MotionEvent transformedEvent = MotionEvent.obtain(event); 1753 transformedEvent.offsetLocation(offsetX, offsetY); 1754 transformedEvent.transform(child.getInverseMatrix()); 1755 handled = child.dispatchGenericMotionEvent(transformedEvent); 1756 transformedEvent.recycle(); 1757 } else { 1758 event.offsetLocation(offsetX, offsetY); 1759 handled = child.dispatchGenericMotionEvent(event); 1760 event.offsetLocation(-offsetX, -offsetY); 1761 } 1762 return handled; 1763 } 1764 1765 /** 1766 * {@inheritDoc} 1767 */ 1768 @Override 1769 public boolean dispatchTouchEvent(MotionEvent ev) { 1770 if (mInputEventConsistencyVerifier != null) { 1771 mInputEventConsistencyVerifier.onTouchEvent(ev, 1); 1772 } 1773 1774 boolean handled = false; 1775 if (onFilterTouchEventForSecurity(ev)) { 1776 final int action = ev.getAction(); 1777 final int actionMasked = action & MotionEvent.ACTION_MASK; 1778 1779 // Handle an initial down. 1780 if (actionMasked == MotionEvent.ACTION_DOWN) { 1781 // Throw away all previous state when starting a new touch gesture. 1782 // The framework may have dropped the up or cancel event for the previous gesture 1783 // due to an app switch, ANR, or some other state change. 1784 cancelAndClearTouchTargets(ev); 1785 resetTouchState(); 1786 } 1787 1788 // Check for interception. 1789 final boolean intercepted; 1790 if (actionMasked == MotionEvent.ACTION_DOWN 1791 || mFirstTouchTarget != null) { 1792 final boolean disallowIntercept = (mGroupFlags & FLAG_DISALLOW_INTERCEPT) != 0; 1793 if (!disallowIntercept) { 1794 intercepted = onInterceptTouchEvent(ev); 1795 ev.setAction(action); // restore action in case it was changed 1796 } else { 1797 intercepted = false; 1798 } 1799 } else { 1800 // There are no touch targets and this action is not an initial down 1801 // so this view group continues to intercept touches. 1802 intercepted = true; 1803 } 1804 1805 // Check for cancelation. 1806 final boolean canceled = resetCancelNextUpFlag(this) 1807 || actionMasked == MotionEvent.ACTION_CANCEL; 1808 1809 // Update list of touch targets for pointer down, if needed. 1810 final boolean split = (mGroupFlags & FLAG_SPLIT_MOTION_EVENTS) != 0; 1811 TouchTarget newTouchTarget = null; 1812 boolean alreadyDispatchedToNewTouchTarget = false; 1813 if (!canceled && !intercepted) { 1814 if (actionMasked == MotionEvent.ACTION_DOWN 1815 || (split && actionMasked == MotionEvent.ACTION_POINTER_DOWN) 1816 || actionMasked == MotionEvent.ACTION_HOVER_MOVE) { 1817 final int actionIndex = ev.getActionIndex(); // always 0 for down 1818 final int idBitsToAssign = split ? 1 << ev.getPointerId(actionIndex) 1819 : TouchTarget.ALL_POINTER_IDS; 1820 1821 // Clean up earlier touch targets for this pointer id in case they 1822 // have become out of sync. 1823 removePointersFromTouchTargets(idBitsToAssign); 1824 1825 final int childrenCount = mChildrenCount; 1826 if (childrenCount != 0) { 1827 // Find a child that can receive the event. 1828 // Scan children from front to back. 1829 final View[] children = mChildren; 1830 final float x = ev.getX(actionIndex); 1831 final float y = ev.getY(actionIndex); 1832 1833 for (int i = childrenCount - 1; i >= 0; i--) { 1834 final View child = children[i]; 1835 if (!canViewReceivePointerEvents(child) 1836 || !isTransformedTouchPointInView(x, y, child, null)) { 1837 continue; 1838 } 1839 1840 newTouchTarget = getTouchTarget(child); 1841 if (newTouchTarget != null) { 1842 // Child is already receiving touch within its bounds. 1843 // Give it the new pointer in addition to the ones it is handling. 1844 newTouchTarget.pointerIdBits |= idBitsToAssign; 1845 break; 1846 } 1847 1848 resetCancelNextUpFlag(child); 1849 if (dispatchTransformedTouchEvent(ev, false, child, idBitsToAssign)) { 1850 // Child wants to receive touch within its bounds. 1851 mLastTouchDownTime = ev.getDownTime(); 1852 mLastTouchDownIndex = i; 1853 mLastTouchDownX = ev.getX(); 1854 mLastTouchDownY = ev.getY(); 1855 newTouchTarget = addTouchTarget(child, idBitsToAssign); 1856 alreadyDispatchedToNewTouchTarget = true; 1857 break; 1858 } 1859 } 1860 } 1861 1862 if (newTouchTarget == null && mFirstTouchTarget != null) { 1863 // Did not find a child to receive the event. 1864 // Assign the pointer to the least recently added target. 1865 newTouchTarget = mFirstTouchTarget; 1866 while (newTouchTarget.next != null) { 1867 newTouchTarget = newTouchTarget.next; 1868 } 1869 newTouchTarget.pointerIdBits |= idBitsToAssign; 1870 } 1871 } 1872 } 1873 1874 // Dispatch to touch targets. 1875 if (mFirstTouchTarget == null) { 1876 // No touch targets so treat this as an ordinary view. 1877 handled = dispatchTransformedTouchEvent(ev, canceled, null, 1878 TouchTarget.ALL_POINTER_IDS); 1879 } else { 1880 // Dispatch to touch targets, excluding the new touch target if we already 1881 // dispatched to it. Cancel touch targets if necessary. 1882 TouchTarget predecessor = null; 1883 TouchTarget target = mFirstTouchTarget; 1884 while (target != null) { 1885 final TouchTarget next = target.next; 1886 if (alreadyDispatchedToNewTouchTarget && target == newTouchTarget) { 1887 handled = true; 1888 } else { 1889 final boolean cancelChild = resetCancelNextUpFlag(target.child) 1890 || intercepted; 1891 if (dispatchTransformedTouchEvent(ev, cancelChild, 1892 target.child, target.pointerIdBits)) { 1893 handled = true; 1894 } 1895 if (cancelChild) { 1896 if (predecessor == null) { 1897 mFirstTouchTarget = next; 1898 } else { 1899 predecessor.next = next; 1900 } 1901 target.recycle(); 1902 target = next; 1903 continue; 1904 } 1905 } 1906 predecessor = target; 1907 target = next; 1908 } 1909 } 1910 1911 // Update list of touch targets for pointer up or cancel, if needed. 1912 if (canceled 1913 || actionMasked == MotionEvent.ACTION_UP 1914 || actionMasked == MotionEvent.ACTION_HOVER_MOVE) { 1915 resetTouchState(); 1916 } else if (split && actionMasked == MotionEvent.ACTION_POINTER_UP) { 1917 final int actionIndex = ev.getActionIndex(); 1918 final int idBitsToRemove = 1 << ev.getPointerId(actionIndex); 1919 removePointersFromTouchTargets(idBitsToRemove); 1920 } 1921 } 1922 1923 if (!handled && mInputEventConsistencyVerifier != null) { 1924 mInputEventConsistencyVerifier.onUnhandledEvent(ev, 1); 1925 } 1926 return handled; 1927 } 1928 1929 /** 1930 * Resets all touch state in preparation for a new cycle. 1931 */ 1932 private void resetTouchState() { 1933 clearTouchTargets(); 1934 resetCancelNextUpFlag(this); 1935 mGroupFlags &= ~FLAG_DISALLOW_INTERCEPT; 1936 } 1937 1938 /** 1939 * Resets the cancel next up flag. 1940 * Returns true if the flag was previously set. 1941 */ 1942 private static boolean resetCancelNextUpFlag(View view) { 1943 if ((view.mPrivateFlags & CANCEL_NEXT_UP_EVENT) != 0) { 1944 view.mPrivateFlags &= ~CANCEL_NEXT_UP_EVENT; 1945 return true; 1946 } 1947 return false; 1948 } 1949 1950 /** 1951 * Clears all touch targets. 1952 */ 1953 private void clearTouchTargets() { 1954 TouchTarget target = mFirstTouchTarget; 1955 if (target != null) { 1956 do { 1957 TouchTarget next = target.next; 1958 target.recycle(); 1959 target = next; 1960 } while (target != null); 1961 mFirstTouchTarget = null; 1962 } 1963 } 1964 1965 /** 1966 * Cancels and clears all touch targets. 1967 */ 1968 private void cancelAndClearTouchTargets(MotionEvent event) { 1969 if (mFirstTouchTarget != null) { 1970 boolean syntheticEvent = false; 1971 if (event == null) { 1972 final long now = SystemClock.uptimeMillis(); 1973 event = MotionEvent.obtain(now, now, 1974 MotionEvent.ACTION_CANCEL, 0.0f, 0.0f, 0); 1975 event.setSource(InputDevice.SOURCE_TOUCHSCREEN); 1976 syntheticEvent = true; 1977 } 1978 1979 for (TouchTarget target = mFirstTouchTarget; target != null; target = target.next) { 1980 resetCancelNextUpFlag(target.child); 1981 dispatchTransformedTouchEvent(event, true, target.child, target.pointerIdBits); 1982 } 1983 clearTouchTargets(); 1984 1985 if (syntheticEvent) { 1986 event.recycle(); 1987 } 1988 } 1989 } 1990 1991 /** 1992 * Gets the touch target for specified child view. 1993 * Returns null if not found. 1994 */ 1995 private TouchTarget getTouchTarget(View child) { 1996 for (TouchTarget target = mFirstTouchTarget; target != null; target = target.next) { 1997 if (target.child == child) { 1998 return target; 1999 } 2000 } 2001 return null; 2002 } 2003 2004 /** 2005 * Adds a touch target for specified child to the beginning of the list. 2006 * Assumes the target child is not already present. 2007 */ 2008 private TouchTarget addTouchTarget(View child, int pointerIdBits) { 2009 TouchTarget target = TouchTarget.obtain(child, pointerIdBits); 2010 target.next = mFirstTouchTarget; 2011 mFirstTouchTarget = target; 2012 return target; 2013 } 2014 2015 /** 2016 * Removes the pointer ids from consideration. 2017 */ 2018 private void removePointersFromTouchTargets(int pointerIdBits) { 2019 TouchTarget predecessor = null; 2020 TouchTarget target = mFirstTouchTarget; 2021 while (target != null) { 2022 final TouchTarget next = target.next; 2023 if ((target.pointerIdBits & pointerIdBits) != 0) { 2024 target.pointerIdBits &= ~pointerIdBits; 2025 if (target.pointerIdBits == 0) { 2026 if (predecessor == null) { 2027 mFirstTouchTarget = next; 2028 } else { 2029 predecessor.next = next; 2030 } 2031 target.recycle(); 2032 target = next; 2033 continue; 2034 } 2035 } 2036 predecessor = target; 2037 target = next; 2038 } 2039 } 2040 2041 private void cancelTouchTarget(View view) { 2042 TouchTarget predecessor = null; 2043 TouchTarget target = mFirstTouchTarget; 2044 while (target != null) { 2045 final TouchTarget next = target.next; 2046 if (target.child == view) { 2047 if (predecessor == null) { 2048 mFirstTouchTarget = next; 2049 } else { 2050 predecessor.next = next; 2051 } 2052 target.recycle(); 2053 2054 final long now = SystemClock.uptimeMillis(); 2055 MotionEvent event = MotionEvent.obtain(now, now, 2056 MotionEvent.ACTION_CANCEL, 0.0f, 0.0f, 0); 2057 event.setSource(InputDevice.SOURCE_TOUCHSCREEN); 2058 view.dispatchTouchEvent(event); 2059 event.recycle(); 2060 return; 2061 } 2062 predecessor = target; 2063 target = next; 2064 } 2065 } 2066 2067 /** 2068 * Returns true if a child view can receive pointer events. 2069 * @hide 2070 */ 2071 private static boolean canViewReceivePointerEvents(View child) { 2072 return (child.mViewFlags & VISIBILITY_MASK) == VISIBLE 2073 || child.getAnimation() != null; 2074 } 2075 2076 /** 2077 * Returns true if a child view contains the specified point when transformed 2078 * into its coordinate space. 2079 * Child must not be null. 2080 * @hide 2081 */ 2082 protected boolean isTransformedTouchPointInView(float x, float y, View child, 2083 PointF outLocalPoint) { 2084 float localX = x + mScrollX - child.mLeft; 2085 float localY = y + mScrollY - child.mTop; 2086 if (! child.hasIdentityMatrix() && mAttachInfo != null) { 2087 final float[] localXY = mAttachInfo.mTmpTransformLocation; 2088 localXY[0] = localX; 2089 localXY[1] = localY; 2090 child.getInverseMatrix().mapPoints(localXY); 2091 localX = localXY[0]; 2092 localY = localXY[1]; 2093 } 2094 final boolean isInView = child.pointInView(localX, localY); 2095 if (isInView && outLocalPoint != null) { 2096 outLocalPoint.set(localX, localY); 2097 } 2098 return isInView; 2099 } 2100 2101 /** 2102 * Transforms a motion event into the coordinate space of a particular child view, 2103 * filters out irrelevant pointer ids, and overrides its action if necessary. 2104 * If child is null, assumes the MotionEvent will be sent to this ViewGroup instead. 2105 */ 2106 private boolean dispatchTransformedTouchEvent(MotionEvent event, boolean cancel, 2107 View child, int desiredPointerIdBits) { 2108 final boolean handled; 2109 2110 // Canceling motions is a special case. We don't need to perform any transformations 2111 // or filtering. The important part is the action, not the contents. 2112 final int oldAction = event.getAction(); 2113 if (cancel || oldAction == MotionEvent.ACTION_CANCEL) { 2114 event.setAction(MotionEvent.ACTION_CANCEL); 2115 if (child == null) { 2116 handled = super.dispatchTouchEvent(event); 2117 } else { 2118 handled = child.dispatchTouchEvent(event); 2119 } 2120 event.setAction(oldAction); 2121 return handled; 2122 } 2123 2124 // Calculate the number of pointers to deliver. 2125 final int oldPointerIdBits = event.getPointerIdBits(); 2126 final int newPointerIdBits = oldPointerIdBits & desiredPointerIdBits; 2127 2128 // If for some reason we ended up in an inconsistent state where it looks like we 2129 // might produce a motion event with no pointers in it, then drop the event. 2130 if (newPointerIdBits == 0) { 2131 return false; 2132 } 2133 2134 // If the number of pointers is the same and we don't need to perform any fancy 2135 // irreversible transformations, then we can reuse the motion event for this 2136 // dispatch as long as we are careful to revert any changes we make. 2137 // Otherwise we need to make a copy. 2138 final MotionEvent transformedEvent; 2139 if (newPointerIdBits == oldPointerIdBits) { 2140 if (child == null || child.hasIdentityMatrix()) { 2141 if (child == null) { 2142 handled = super.dispatchTouchEvent(event); 2143 } else { 2144 final float offsetX = mScrollX - child.mLeft; 2145 final float offsetY = mScrollY - child.mTop; 2146 event.offsetLocation(offsetX, offsetY); 2147 2148 handled = child.dispatchTouchEvent(event); 2149 2150 event.offsetLocation(-offsetX, -offsetY); 2151 } 2152 return handled; 2153 } 2154 transformedEvent = MotionEvent.obtain(event); 2155 } else { 2156 transformedEvent = event.split(newPointerIdBits); 2157 } 2158 2159 // Perform any necessary transformations and dispatch. 2160 if (child == null) { 2161 handled = super.dispatchTouchEvent(transformedEvent); 2162 } else { 2163 final float offsetX = mScrollX - child.mLeft; 2164 final float offsetY = mScrollY - child.mTop; 2165 transformedEvent.offsetLocation(offsetX, offsetY); 2166 if (! child.hasIdentityMatrix()) { 2167 transformedEvent.transform(child.getInverseMatrix()); 2168 } 2169 2170 handled = child.dispatchTouchEvent(transformedEvent); 2171 } 2172 2173 // Done. 2174 transformedEvent.recycle(); 2175 return handled; 2176 } 2177 2178 /** 2179 * Enable or disable the splitting of MotionEvents to multiple children during touch event 2180 * dispatch. This behavior is enabled by default for applications that target an 2181 * SDK version of {@link Build.VERSION_CODES#HONEYCOMB} or newer. 2182 * 2183 * <p>When this option is enabled MotionEvents may be split and dispatched to different child 2184 * views depending on where each pointer initially went down. This allows for user interactions 2185 * such as scrolling two panes of content independently, chording of buttons, and performing 2186 * independent gestures on different pieces of content. 2187 * 2188 * @param split <code>true</code> to allow MotionEvents to be split and dispatched to multiple 2189 * child views. <code>false</code> to only allow one child view to be the target of 2190 * any MotionEvent received by this ViewGroup. 2191 */ 2192 public void setMotionEventSplittingEnabled(boolean split) { 2193 // TODO Applications really shouldn't change this setting mid-touch event, 2194 // but perhaps this should handle that case and send ACTION_CANCELs to any child views 2195 // with gestures in progress when this is changed. 2196 if (split) { 2197 mGroupFlags |= FLAG_SPLIT_MOTION_EVENTS; 2198 } else { 2199 mGroupFlags &= ~FLAG_SPLIT_MOTION_EVENTS; 2200 } 2201 } 2202 2203 /** 2204 * Returns true if MotionEvents dispatched to this ViewGroup can be split to multiple children. 2205 * @return true if MotionEvents dispatched to this ViewGroup can be split to multiple children. 2206 */ 2207 public boolean isMotionEventSplittingEnabled() { 2208 return (mGroupFlags & FLAG_SPLIT_MOTION_EVENTS) == FLAG_SPLIT_MOTION_EVENTS; 2209 } 2210 2211 /** 2212 * {@inheritDoc} 2213 */ 2214 public void requestDisallowInterceptTouchEvent(boolean disallowIntercept) { 2215 2216 if (disallowIntercept == ((mGroupFlags & FLAG_DISALLOW_INTERCEPT) != 0)) { 2217 // We're already in this state, assume our ancestors are too 2218 return; 2219 } 2220 2221 if (disallowIntercept) { 2222 mGroupFlags |= FLAG_DISALLOW_INTERCEPT; 2223 } else { 2224 mGroupFlags &= ~FLAG_DISALLOW_INTERCEPT; 2225 } 2226 2227 // Pass it up to our parent 2228 if (mParent != null) { 2229 mParent.requestDisallowInterceptTouchEvent(disallowIntercept); 2230 } 2231 } 2232 2233 /** 2234 * Implement this method to intercept all touch screen motion events. This 2235 * allows you to watch events as they are dispatched to your children, and 2236 * take ownership of the current gesture at any point. 2237 * 2238 * <p>Using this function takes some care, as it has a fairly complicated 2239 * interaction with {@link View#onTouchEvent(MotionEvent) 2240 * View.onTouchEvent(MotionEvent)}, and using it requires implementing 2241 * that method as well as this one in the correct way. Events will be 2242 * received in the following order: 2243 * 2244 * <ol> 2245 * <li> You will receive the down event here. 2246 * <li> The down event will be handled either by a child of this view 2247 * group, or given to your own onTouchEvent() method to handle; this means 2248 * you should implement onTouchEvent() to return true, so you will 2249 * continue to see the rest of the gesture (instead of looking for 2250 * a parent view to handle it). Also, by returning true from 2251 * onTouchEvent(), you will not receive any following 2252 * events in onInterceptTouchEvent() and all touch processing must 2253 * happen in onTouchEvent() like normal. 2254 * <li> For as long as you return false from this function, each following 2255 * event (up to and including the final up) will be delivered first here 2256 * and then to the target's onTouchEvent(). 2257 * <li> If you return true from here, you will not receive any 2258 * following events: the target view will receive the same event but 2259 * with the action {@link MotionEvent#ACTION_CANCEL}, and all further 2260 * events will be delivered to your onTouchEvent() method and no longer 2261 * appear here. 2262 * </ol> 2263 * 2264 * @param ev The motion event being dispatched down the hierarchy. 2265 * @return Return true to steal motion events from the children and have 2266 * them dispatched to this ViewGroup through onTouchEvent(). 2267 * The current target will receive an ACTION_CANCEL event, and no further 2268 * messages will be delivered here. 2269 */ 2270 public boolean onInterceptTouchEvent(MotionEvent ev) { 2271 return false; 2272 } 2273 2274 /** 2275 * {@inheritDoc} 2276 * 2277 * Looks for a view to give focus to respecting the setting specified by 2278 * {@link #getDescendantFocusability()}. 2279 * 2280 * Uses {@link #onRequestFocusInDescendants(int, android.graphics.Rect)} to 2281 * find focus within the children of this group when appropriate. 2282 * 2283 * @see #FOCUS_BEFORE_DESCENDANTS 2284 * @see #FOCUS_AFTER_DESCENDANTS 2285 * @see #FOCUS_BLOCK_DESCENDANTS 2286 * @see #onRequestFocusInDescendants(int, android.graphics.Rect) 2287 */ 2288 @Override 2289 public boolean requestFocus(int direction, Rect previouslyFocusedRect) { 2290 if (DBG) { 2291 System.out.println(this + " ViewGroup.requestFocus direction=" 2292 + direction); 2293 } 2294 int descendantFocusability = getDescendantFocusability(); 2295 2296 switch (descendantFocusability) { 2297 case FOCUS_BLOCK_DESCENDANTS: 2298 return super.requestFocus(direction, previouslyFocusedRect); 2299 case FOCUS_BEFORE_DESCENDANTS: { 2300 final boolean took = super.requestFocus(direction, previouslyFocusedRect); 2301 return took ? took : onRequestFocusInDescendants(direction, previouslyFocusedRect); 2302 } 2303 case FOCUS_AFTER_DESCENDANTS: { 2304 final boolean took = onRequestFocusInDescendants(direction, previouslyFocusedRect); 2305 return took ? took : super.requestFocus(direction, previouslyFocusedRect); 2306 } 2307 default: 2308 throw new IllegalStateException("descendant focusability must be " 2309 + "one of FOCUS_BEFORE_DESCENDANTS, FOCUS_AFTER_DESCENDANTS, FOCUS_BLOCK_DESCENDANTS " 2310 + "but is " + descendantFocusability); 2311 } 2312 } 2313 2314 /** 2315 * Look for a descendant to call {@link View#requestFocus} on. 2316 * Called by {@link ViewGroup#requestFocus(int, android.graphics.Rect)} 2317 * when it wants to request focus within its children. Override this to 2318 * customize how your {@link ViewGroup} requests focus within its children. 2319 * @param direction One of FOCUS_UP, FOCUS_DOWN, FOCUS_LEFT, and FOCUS_RIGHT 2320 * @param previouslyFocusedRect The rectangle (in this View's coordinate system) 2321 * to give a finer grained hint about where focus is coming from. May be null 2322 * if there is no hint. 2323 * @return Whether focus was taken. 2324 */ 2325 @SuppressWarnings({"ConstantConditions"}) 2326 protected boolean onRequestFocusInDescendants(int direction, 2327 Rect previouslyFocusedRect) { 2328 int index; 2329 int increment; 2330 int end; 2331 int count = mChildrenCount; 2332 if ((direction & FOCUS_FORWARD) != 0) { 2333 index = 0; 2334 increment = 1; 2335 end = count; 2336 } else { 2337 index = count - 1; 2338 increment = -1; 2339 end = -1; 2340 } 2341 final View[] children = mChildren; 2342 for (int i = index; i != end; i += increment) { 2343 View child = children[i]; 2344 if ((child.mViewFlags & VISIBILITY_MASK) == VISIBLE) { 2345 if (child.requestFocus(direction, previouslyFocusedRect)) { 2346 return true; 2347 } 2348 } 2349 } 2350 return false; 2351 } 2352 2353 /** 2354 * {@inheritDoc} 2355 * 2356 * @hide 2357 */ 2358 @Override 2359 public void dispatchStartTemporaryDetach() { 2360 super.dispatchStartTemporaryDetach(); 2361 final int count = mChildrenCount; 2362 final View[] children = mChildren; 2363 for (int i = 0; i < count; i++) { 2364 children[i].dispatchStartTemporaryDetach(); 2365 } 2366 } 2367 2368 /** 2369 * {@inheritDoc} 2370 * 2371 * @hide 2372 */ 2373 @Override 2374 public void dispatchFinishTemporaryDetach() { 2375 super.dispatchFinishTemporaryDetach(); 2376 final int count = mChildrenCount; 2377 final View[] children = mChildren; 2378 for (int i = 0; i < count; i++) { 2379 children[i].dispatchFinishTemporaryDetach(); 2380 } 2381 } 2382 2383 /** 2384 * {@inheritDoc} 2385 */ 2386 @Override 2387 void dispatchAttachedToWindow(AttachInfo info, int visibility) { 2388 mGroupFlags |= FLAG_PREVENT_DISPATCH_ATTACHED_TO_WINDOW; 2389 super.dispatchAttachedToWindow(info, visibility); 2390 mGroupFlags &= ~FLAG_PREVENT_DISPATCH_ATTACHED_TO_WINDOW; 2391 2392 final int count = mChildrenCount; 2393 final View[] children = mChildren; 2394 for (int i = 0; i < count; i++) { 2395 final View child = children[i]; 2396 child.dispatchAttachedToWindow(info, 2397 visibility | (child.mViewFlags&VISIBILITY_MASK)); 2398 } 2399 } 2400 2401 @Override 2402 void dispatchScreenStateChanged(int screenState) { 2403 super.dispatchScreenStateChanged(screenState); 2404 2405 final int count = mChildrenCount; 2406 final View[] children = mChildren; 2407 for (int i = 0; i < count; i++) { 2408 children[i].dispatchScreenStateChanged(screenState); 2409 } 2410 } 2411 2412 @Override 2413 boolean dispatchPopulateAccessibilityEventInternal(AccessibilityEvent event) { 2414 boolean handled = false; 2415 if (includeForAccessibility()) { 2416 handled = super.dispatchPopulateAccessibilityEventInternal(event); 2417 if (handled) { 2418 return handled; 2419 } 2420 } 2421 // Let our children have a shot in populating the event. 2422 ChildListForAccessibility children = ChildListForAccessibility.obtain(this, true); 2423 try { 2424 final int childCount = children.getChildCount(); 2425 for (int i = 0; i < childCount; i++) { 2426 View child = children.getChildAt(i); 2427 if ((child.mViewFlags & VISIBILITY_MASK) == VISIBLE) { 2428 handled = child.dispatchPopulateAccessibilityEvent(event); 2429 if (handled) { 2430 children.recycle(); 2431 return handled; 2432 } 2433 } 2434 } 2435 } finally { 2436 children.recycle(); 2437 } 2438 return false; 2439 } 2440 2441 @Override 2442 void onInitializeAccessibilityNodeInfoInternal(AccessibilityNodeInfo info) { 2443 super.onInitializeAccessibilityNodeInfoInternal(info); 2444 if (mAttachInfo != null) { 2445 ArrayList<View> childrenForAccessibility = mAttachInfo.mTempArrayList; 2446 childrenForAccessibility.clear(); 2447 addChildrenForAccessibility(childrenForAccessibility); 2448 final int childrenForAccessibilityCount = childrenForAccessibility.size(); 2449 for (int i = 0; i < childrenForAccessibilityCount; i++) { 2450 View child = childrenForAccessibility.get(i); 2451 info.addChild(child); 2452 } 2453 childrenForAccessibility.clear(); 2454 } 2455 } 2456 2457 @Override 2458 void onInitializeAccessibilityEventInternal(AccessibilityEvent event) { 2459 super.onInitializeAccessibilityEventInternal(event); 2460 event.setClassName(ViewGroup.class.getName()); 2461 } 2462 2463 /** 2464 * @hide 2465 */ 2466 @Override 2467 public void resetAccessibilityStateChanged() { 2468 super.resetAccessibilityStateChanged(); 2469 View[] children = mChildren; 2470 final int childCount = mChildrenCount; 2471 for (int i = 0; i < childCount; i++) { 2472 View child = children[i]; 2473 child.resetAccessibilityStateChanged(); 2474 } 2475 } 2476 2477 /** 2478 * {@inheritDoc} 2479 */ 2480 @Override 2481 void dispatchDetachedFromWindow() { 2482 // If we still have a touch target, we are still in the process of 2483 // dispatching motion events to a child; we need to get rid of that 2484 // child to avoid dispatching events to it after the window is torn 2485 // down. To make sure we keep the child in a consistent state, we 2486 // first send it an ACTION_CANCEL motion event. 2487 cancelAndClearTouchTargets(null); 2488 2489 // Similarly, set ACTION_EXIT to all hover targets and clear them. 2490 exitHoverTargets(); 2491 2492 // In case view is detached while transition is running 2493 mLayoutSuppressed = false; 2494 2495 // Tear down our drag tracking 2496 mDragNotifiedChildren = null; 2497 if (mCurrentDrag != null) { 2498 mCurrentDrag.recycle(); 2499 mCurrentDrag = null; 2500 } 2501 2502 final int count = mChildrenCount; 2503 final View[] children = mChildren; 2504 for (int i = 0; i < count; i++) { 2505 children[i].dispatchDetachedFromWindow(); 2506 } 2507 super.dispatchDetachedFromWindow(); 2508 } 2509 2510 /** 2511 * {@inheritDoc} 2512 */ 2513 @Override 2514 public void setPadding(int left, int top, int right, int bottom) { 2515 super.setPadding(left, top, right, bottom); 2516 2517 if ((mPaddingLeft | mPaddingTop | mPaddingRight | mPaddingBottom) != 0) { 2518 mGroupFlags |= FLAG_PADDING_NOT_NULL; 2519 } else { 2520 mGroupFlags &= ~FLAG_PADDING_NOT_NULL; 2521 } 2522 } 2523 2524 /** 2525 * {@inheritDoc} 2526 */ 2527 @Override 2528 protected void dispatchSaveInstanceState(SparseArray<Parcelable> container) { 2529 super.dispatchSaveInstanceState(container); 2530 final int count = mChildrenCount; 2531 final View[] children = mChildren; 2532 for (int i = 0; i < count; i++) { 2533 View c = children[i]; 2534 if ((c.mViewFlags & PARENT_SAVE_DISABLED_MASK) != PARENT_SAVE_DISABLED) { 2535 c.dispatchSaveInstanceState(container); 2536 } 2537 } 2538 } 2539 2540 /** 2541 * Perform dispatching of a {@link #saveHierarchyState(android.util.SparseArray)} freeze()} 2542 * to only this view, not to its children. For use when overriding 2543 * {@link #dispatchSaveInstanceState(android.util.SparseArray)} dispatchFreeze()} to allow 2544 * subclasses to freeze their own state but not the state of their children. 2545 * 2546 * @param container the container 2547 */ 2548 protected void dispatchFreezeSelfOnly(SparseArray<Parcelable> container) { 2549 super.dispatchSaveInstanceState(container); 2550 } 2551 2552 /** 2553 * {@inheritDoc} 2554 */ 2555 @Override 2556 protected void dispatchRestoreInstanceState(SparseArray<Parcelable> container) { 2557 super.dispatchRestoreInstanceState(container); 2558 final int count = mChildrenCount; 2559 final View[] children = mChildren; 2560 for (int i = 0; i < count; i++) { 2561 View c = children[i]; 2562 if ((c.mViewFlags & PARENT_SAVE_DISABLED_MASK) != PARENT_SAVE_DISABLED) { 2563 c.dispatchRestoreInstanceState(container); 2564 } 2565 } 2566 } 2567 2568 /** 2569 * Perform dispatching of a {@link #restoreHierarchyState(android.util.SparseArray)} 2570 * to only this view, not to its children. For use when overriding 2571 * {@link #dispatchRestoreInstanceState(android.util.SparseArray)} to allow 2572 * subclasses to thaw their own state but not the state of their children. 2573 * 2574 * @param container the container 2575 */ 2576 protected void dispatchThawSelfOnly(SparseArray<Parcelable> container) { 2577 super.dispatchRestoreInstanceState(container); 2578 } 2579 2580 /** 2581 * Enables or disables the drawing cache for each child of this view group. 2582 * 2583 * @param enabled true to enable the cache, false to dispose of it 2584 */ 2585 protected void setChildrenDrawingCacheEnabled(boolean enabled) { 2586 if (enabled || (mPersistentDrawingCache & PERSISTENT_ALL_CACHES) != PERSISTENT_ALL_CACHES) { 2587 final View[] children = mChildren; 2588 final int count = mChildrenCount; 2589 for (int i = 0; i < count; i++) { 2590 children[i].setDrawingCacheEnabled(enabled); 2591 } 2592 } 2593 } 2594 2595 @Override 2596 protected void onAnimationStart() { 2597 super.onAnimationStart(); 2598 2599 // When this ViewGroup's animation starts, build the cache for the children 2600 if ((mGroupFlags & FLAG_ANIMATION_CACHE) == FLAG_ANIMATION_CACHE) { 2601 final int count = mChildrenCount; 2602 final View[] children = mChildren; 2603 final boolean buildCache = !isHardwareAccelerated(); 2604 2605 for (int i = 0; i < count; i++) { 2606 final View child = children[i]; 2607 if ((child.mViewFlags & VISIBILITY_MASK) == VISIBLE) { 2608 child.setDrawingCacheEnabled(true); 2609 if (buildCache) { 2610 child.buildDrawingCache(true); 2611 } 2612 } 2613 } 2614 2615 mGroupFlags |= FLAG_CHILDREN_DRAWN_WITH_CACHE; 2616 } 2617 } 2618 2619 @Override 2620 protected void onAnimationEnd() { 2621 super.onAnimationEnd(); 2622 2623 // When this ViewGroup's animation ends, destroy the cache of the children 2624 if ((mGroupFlags & FLAG_ANIMATION_CACHE) == FLAG_ANIMATION_CACHE) { 2625 mGroupFlags &= ~FLAG_CHILDREN_DRAWN_WITH_CACHE; 2626 2627 if ((mPersistentDrawingCache & PERSISTENT_ANIMATION_CACHE) == 0) { 2628 setChildrenDrawingCacheEnabled(false); 2629 } 2630 } 2631 } 2632 2633 @Override 2634 Bitmap createSnapshot(Bitmap.Config quality, int backgroundColor, boolean skipChildren) { 2635 int count = mChildrenCount; 2636 int[] visibilities = null; 2637 2638 if (skipChildren) { 2639 visibilities = new int[count]; 2640 for (int i = 0; i < count; i++) { 2641 View child = getChildAt(i); 2642 visibilities[i] = child.getVisibility(); 2643 if (visibilities[i] == View.VISIBLE) { 2644 child.setVisibility(INVISIBLE); 2645 } 2646 } 2647 } 2648 2649 Bitmap b = super.createSnapshot(quality, backgroundColor, skipChildren); 2650 2651 if (skipChildren) { 2652 for (int i = 0; i < count; i++) { 2653 getChildAt(i).setVisibility(visibilities[i]); 2654 } 2655 } 2656 2657 return b; 2658 } 2659 2660 /** 2661 * {@inheritDoc} 2662 */ 2663 @Override 2664 protected void dispatchDraw(Canvas canvas) { 2665 final int count = mChildrenCount; 2666 final View[] children = mChildren; 2667 int flags = mGroupFlags; 2668 2669 if ((flags & FLAG_RUN_ANIMATION) != 0 && canAnimate()) { 2670 final boolean cache = (mGroupFlags & FLAG_ANIMATION_CACHE) == FLAG_ANIMATION_CACHE; 2671 2672 final boolean buildCache = !isHardwareAccelerated(); 2673 for (int i = 0; i < count; i++) { 2674 final View child = children[i]; 2675 if ((child.mViewFlags & VISIBILITY_MASK) == VISIBLE) { 2676 final LayoutParams params = child.getLayoutParams(); 2677 attachLayoutAnimationParameters(child, params, i, count); 2678 bindLayoutAnimation(child); 2679 if (cache) { 2680 child.setDrawingCacheEnabled(true); 2681 if (buildCache) { 2682 child.buildDrawingCache(true); 2683 } 2684 } 2685 } 2686 } 2687 2688 final LayoutAnimationController controller = mLayoutAnimationController; 2689 if (controller.willOverlap()) { 2690 mGroupFlags |= FLAG_OPTIMIZE_INVALIDATE; 2691 } 2692 2693 controller.start(); 2694 2695 mGroupFlags &= ~FLAG_RUN_ANIMATION; 2696 mGroupFlags &= ~FLAG_ANIMATION_DONE; 2697 2698 if (cache) { 2699 mGroupFlags |= FLAG_CHILDREN_DRAWN_WITH_CACHE; 2700 } 2701 2702 if (mAnimationListener != null) { 2703 mAnimationListener.onAnimationStart(controller.getAnimation()); 2704 } 2705 } 2706 2707 int saveCount = 0; 2708 final boolean clipToPadding = (flags & CLIP_TO_PADDING_MASK) == CLIP_TO_PADDING_MASK; 2709 if (clipToPadding) { 2710 saveCount = canvas.save(); 2711 canvas.clipRect(mScrollX + mPaddingLeft, mScrollY + mPaddingTop, 2712 mScrollX + mRight - mLeft - mPaddingRight, 2713 mScrollY + mBottom - mTop - mPaddingBottom); 2714 2715 } 2716 2717 // We will draw our child's animation, let's reset the flag 2718 mPrivateFlags &= ~DRAW_ANIMATION; 2719 mGroupFlags &= ~FLAG_INVALIDATE_REQUIRED; 2720 2721 boolean more = false; 2722 final long drawingTime = getDrawingTime(); 2723 2724 if ((flags & FLAG_USE_CHILD_DRAWING_ORDER) == 0) { 2725 for (int i = 0; i < count; i++) { 2726 final View child = children[i]; 2727 if ((child.mViewFlags & VISIBILITY_MASK) == VISIBLE || child.getAnimation() != null) { 2728 more |= drawChild(canvas, child, drawingTime); 2729 } 2730 } 2731 } else { 2732 for (int i = 0; i < count; i++) { 2733 final View child = children[getChildDrawingOrder(count, i)]; 2734 if ((child.mViewFlags & VISIBILITY_MASK) == VISIBLE || child.getAnimation() != null) { 2735 more |= drawChild(canvas, child, drawingTime); 2736 } 2737 } 2738 } 2739 2740 // Draw any disappearing views that have animations 2741 if (mDisappearingChildren != null) { 2742 final ArrayList<View> disappearingChildren = mDisappearingChildren; 2743 final int disappearingCount = disappearingChildren.size() - 1; 2744 // Go backwards -- we may delete as animations finish 2745 for (int i = disappearingCount; i >= 0; i--) { 2746 final View child = disappearingChildren.get(i); 2747 more |= drawChild(canvas, child, drawingTime); 2748 } 2749 } 2750 2751 if (clipToPadding) { 2752 canvas.restoreToCount(saveCount); 2753 } 2754 2755 // mGroupFlags might have been updated by drawChild() 2756 flags = mGroupFlags; 2757 2758 if ((flags & FLAG_INVALIDATE_REQUIRED) == FLAG_INVALIDATE_REQUIRED) { 2759 invalidate(true); 2760 } 2761 2762 if ((flags & FLAG_ANIMATION_DONE) == 0 && (flags & FLAG_NOTIFY_ANIMATION_LISTENER) == 0 && 2763 mLayoutAnimationController.isDone() && !more) { 2764 // We want to erase the drawing cache and notify the listener after the 2765 // next frame is drawn because one extra invalidate() is caused by 2766 // drawChild() after the animation is over 2767 mGroupFlags |= FLAG_NOTIFY_ANIMATION_LISTENER; 2768 final Runnable end = new Runnable() { 2769 public void run() { 2770 notifyAnimationListener(); 2771 } 2772 }; 2773 post(end); 2774 } 2775 } 2776 2777 /** 2778 * Returns the index of the child to draw for this iteration. Override this 2779 * if you want to change the drawing order of children. By default, it 2780 * returns i. 2781 * <p> 2782 * NOTE: In order for this method to be called, you must enable child ordering 2783 * first by calling {@link #setChildrenDrawingOrderEnabled(boolean)}. 2784 * 2785 * @param i The current iteration. 2786 * @return The index of the child to draw this iteration. 2787 * 2788 * @see #setChildrenDrawingOrderEnabled(boolean) 2789 * @see #isChildrenDrawingOrderEnabled() 2790 */ 2791 protected int getChildDrawingOrder(int childCount, int i) { 2792 return i; 2793 } 2794 2795 private void notifyAnimationListener() { 2796 mGroupFlags &= ~FLAG_NOTIFY_ANIMATION_LISTENER; 2797 mGroupFlags |= FLAG_ANIMATION_DONE; 2798 2799 if (mAnimationListener != null) { 2800 final Runnable end = new Runnable() { 2801 public void run() { 2802 mAnimationListener.onAnimationEnd(mLayoutAnimationController.getAnimation()); 2803 } 2804 }; 2805 post(end); 2806 } 2807 2808 if ((mGroupFlags & FLAG_ANIMATION_CACHE) == FLAG_ANIMATION_CACHE) { 2809 mGroupFlags &= ~FLAG_CHILDREN_DRAWN_WITH_CACHE; 2810 if ((mPersistentDrawingCache & PERSISTENT_ANIMATION_CACHE) == 0) { 2811 setChildrenDrawingCacheEnabled(false); 2812 } 2813 } 2814 2815 invalidate(true); 2816 } 2817 2818 /** 2819 * This method is used to cause children of this ViewGroup to restore or recreate their 2820 * display lists. It is called by getDisplayList() when the parent ViewGroup does not need 2821 * to recreate its own display list, which would happen if it went through the normal 2822 * draw/dispatchDraw mechanisms. 2823 * 2824 * @hide 2825 */ 2826 @Override 2827 protected void dispatchGetDisplayList() { 2828 final int count = mChildrenCount; 2829 final View[] children = mChildren; 2830 for (int i = 0; i < count; i++) { 2831 final View child = children[i]; 2832 if (((child.mViewFlags & VISIBILITY_MASK) == VISIBLE || child.getAnimation() != null) && 2833 child.hasStaticLayer()) { 2834 child.mRecreateDisplayList = (child.mPrivateFlags & INVALIDATED) == INVALIDATED; 2835 child.mPrivateFlags &= ~INVALIDATED; 2836 child.getDisplayList(); 2837 child.mRecreateDisplayList = false; 2838 } 2839 } 2840 } 2841 2842 /** 2843 * Draw one child of this View Group. This method is responsible for getting 2844 * the canvas in the right state. This includes clipping, translating so 2845 * that the child's scrolled origin is at 0, 0, and applying any animation 2846 * transformations. 2847 * 2848 * @param canvas The canvas on which to draw the child 2849 * @param child Who to draw 2850 * @param drawingTime The time at which draw is occurring 2851 * @return True if an invalidate() was issued 2852 */ 2853 protected boolean drawChild(Canvas canvas, View child, long drawingTime) { 2854 return child.draw(canvas, this, drawingTime); 2855 } 2856 2857 /** 2858 * 2859 * @param enabled True if children should be drawn with layers, false otherwise. 2860 * 2861 * @hide 2862 */ 2863 public void setChildrenLayersEnabled(boolean enabled) { 2864 if (enabled != mDrawLayers) { 2865 mDrawLayers = enabled; 2866 invalidate(true); 2867 2868 boolean flushLayers = !enabled; 2869 AttachInfo info = mAttachInfo; 2870 if (info != null && info.mHardwareRenderer != null && 2871 info.mHardwareRenderer.isEnabled()) { 2872 if (!info.mHardwareRenderer.validate()) { 2873 flushLayers = false; 2874 } 2875 } else { 2876 flushLayers = false; 2877 } 2878 2879 // We need to invalidate any child with a layer. For instance, 2880 // if a child is backed by a hardware layer and we disable layers 2881 // the child is marked as not dirty (flags cleared the last time 2882 // the child was drawn inside its layer.) However, that child might 2883 // never have created its own display list or have an obsolete 2884 // display list. By invalidating the child we ensure the display 2885 // list is in sync with the content of the hardware layer. 2886 for (int i = 0; i < mChildrenCount; i++) { 2887 View child = mChildren[i]; 2888 if (child.mLayerType != LAYER_TYPE_NONE) { 2889 if (flushLayers) child.flushLayer(); 2890 child.invalidate(true); 2891 } 2892 } 2893 } 2894 } 2895 2896 /** 2897 * By default, children are clipped to their bounds before drawing. This 2898 * allows view groups to override this behavior for animations, etc. 2899 * 2900 * @param clipChildren true to clip children to their bounds, 2901 * false otherwise 2902 * @attr ref android.R.styleable#ViewGroup_clipChildren 2903 */ 2904 public void setClipChildren(boolean clipChildren) { 2905 boolean previousValue = (mGroupFlags & FLAG_CLIP_CHILDREN) == FLAG_CLIP_CHILDREN; 2906 if (clipChildren != previousValue) { 2907 setBooleanFlag(FLAG_CLIP_CHILDREN, clipChildren); 2908 for (int i = 0; i < mChildrenCount; ++i) { 2909 View child = getChildAt(i); 2910 if (child.mDisplayList != null) { 2911 child.mDisplayList.setClipChildren(clipChildren); 2912 } 2913 } 2914 } 2915 } 2916 2917 /** 2918 * By default, children are clipped to the padding of the ViewGroup. This 2919 * allows view groups to override this behavior 2920 * 2921 * @param clipToPadding true to clip children to the padding of the 2922 * group, false otherwise 2923 * @attr ref android.R.styleable#ViewGroup_clipToPadding 2924 */ 2925 public void setClipToPadding(boolean clipToPadding) { 2926 setBooleanFlag(FLAG_CLIP_TO_PADDING, clipToPadding); 2927 } 2928 2929 /** 2930 * {@inheritDoc} 2931 */ 2932 @Override 2933 public void dispatchSetSelected(boolean selected) { 2934 final View[] children = mChildren; 2935 final int count = mChildrenCount; 2936 for (int i = 0; i < count; i++) { 2937 children[i].setSelected(selected); 2938 } 2939 } 2940 2941 /** 2942 * {@inheritDoc} 2943 */ 2944 @Override 2945 public void dispatchSetActivated(boolean activated) { 2946 final View[] children = mChildren; 2947 final int count = mChildrenCount; 2948 for (int i = 0; i < count; i++) { 2949 children[i].setActivated(activated); 2950 } 2951 } 2952 2953 @Override 2954 protected void dispatchSetPressed(boolean pressed) { 2955 final View[] children = mChildren; 2956 final int count = mChildrenCount; 2957 for (int i = 0; i < count; i++) { 2958 final View child = children[i]; 2959 // Children that are clickable on their own should not 2960 // show a pressed state when their parent view does. 2961 // Clearing a pressed state always propagates. 2962 if (!pressed || (!child.isClickable() && !child.isLongClickable())) { 2963 child.setPressed(pressed); 2964 } 2965 } 2966 } 2967 2968 /** 2969 * When this property is set to true, this ViewGroup supports static transformations on 2970 * children; this causes 2971 * {@link #getChildStaticTransformation(View, android.view.animation.Transformation)} to be 2972 * invoked when a child is drawn. 2973 * 2974 * Any subclass overriding 2975 * {@link #getChildStaticTransformation(View, android.view.animation.Transformation)} should 2976 * set this property to true. 2977 * 2978 * @param enabled True to enable static transformations on children, false otherwise. 2979 * 2980 * @see #FLAG_SUPPORT_STATIC_TRANSFORMATIONS 2981 */ 2982 protected void setStaticTransformationsEnabled(boolean enabled) { 2983 setBooleanFlag(FLAG_SUPPORT_STATIC_TRANSFORMATIONS, enabled); 2984 } 2985 2986 /** 2987 * Sets <code>t</code> to be the static transformation of the child, if set, returning a 2988 * boolean to indicate whether a static transform was set. The default implementation 2989 * simply returns <code>false</code>; subclasses may override this method for different 2990 * behavior. 2991 * 2992 * @param child The child view whose static transform is being requested 2993 * @param t The Transformation which will hold the result 2994 * @return true if the transformation was set, false otherwise 2995 * @see #setStaticTransformationsEnabled(boolean) 2996 */ 2997 protected boolean getChildStaticTransformation(View child, Transformation t) { 2998 return false; 2999 } 3000 3001 /** 3002 * {@hide} 3003 */ 3004 @Override 3005 protected View findViewTraversal(int id) { 3006 if (id == mID) { 3007 return this; 3008 } 3009 3010 final View[] where = mChildren; 3011 final int len = mChildrenCount; 3012 3013 for (int i = 0; i < len; i++) { 3014 View v = where[i]; 3015 3016 if ((v.mPrivateFlags & IS_ROOT_NAMESPACE) == 0) { 3017 v = v.findViewById(id); 3018 3019 if (v != null) { 3020 return v; 3021 } 3022 } 3023 } 3024 3025 return null; 3026 } 3027 3028 /** 3029 * {@hide} 3030 */ 3031 @Override 3032 protected View findViewWithTagTraversal(Object tag) { 3033 if (tag != null && tag.equals(mTag)) { 3034 return this; 3035 } 3036 3037 final View[] where = mChildren; 3038 final int len = mChildrenCount; 3039 3040 for (int i = 0; i < len; i++) { 3041 View v = where[i]; 3042 3043 if ((v.mPrivateFlags & IS_ROOT_NAMESPACE) == 0) { 3044 v = v.findViewWithTag(tag); 3045 3046 if (v != null) { 3047 return v; 3048 } 3049 } 3050 } 3051 3052 return null; 3053 } 3054 3055 /** 3056 * {@hide} 3057 */ 3058 @Override 3059 protected View findViewByPredicateTraversal(Predicate<View> predicate, View childToSkip) { 3060 if (predicate.apply(this)) { 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 != childToSkip && (v.mPrivateFlags & IS_ROOT_NAMESPACE) == 0) { 3071 v = v.findViewByPredicate(predicate); 3072 3073 if (v != null) { 3074 return v; 3075 } 3076 } 3077 } 3078 3079 return null; 3080 } 3081 3082 /** 3083 * Adds a child view. If no layout parameters are already set on the child, the 3084 * default parameters for this ViewGroup are set on the child. 3085 * 3086 * @param child the child view to add 3087 * 3088 * @see #generateDefaultLayoutParams() 3089 */ 3090 public void addView(View child) { 3091 addView(child, -1); 3092 } 3093 3094 /** 3095 * Adds a child view. If no layout parameters are already set on the child, the 3096 * default parameters for this ViewGroup are set on the child. 3097 * 3098 * @param child the child view to add 3099 * @param index the position at which to add the child 3100 * 3101 * @see #generateDefaultLayoutParams() 3102 */ 3103 public void addView(View child, int index) { 3104 LayoutParams params = child.getLayoutParams(); 3105 if (params == null) { 3106 params = generateDefaultLayoutParams(); 3107 if (params == null) { 3108 throw new IllegalArgumentException("generateDefaultLayoutParams() cannot return null"); 3109 } 3110 } 3111 addView(child, index, params); 3112 } 3113 3114 /** 3115 * Adds a child view with this ViewGroup's default layout parameters and the 3116 * specified width and height. 3117 * 3118 * @param child the child view to add 3119 */ 3120 public void addView(View child, int width, int height) { 3121 final LayoutParams params = generateDefaultLayoutParams(); 3122 params.width = width; 3123 params.height = height; 3124 addView(child, -1, params); 3125 } 3126 3127 /** 3128 * Adds a child view with the specified layout parameters. 3129 * 3130 * @param child the child view to add 3131 * @param params the layout parameters to set on the child 3132 */ 3133 public void addView(View child, LayoutParams params) { 3134 addView(child, -1, params); 3135 } 3136 3137 /** 3138 * Adds a child view with the specified layout parameters. 3139 * 3140 * @param child the child view to add 3141 * @param index the position at which to add the child 3142 * @param params the layout parameters to set on the child 3143 */ 3144 public void addView(View child, int index, LayoutParams params) { 3145 if (DBG) { 3146 System.out.println(this + " addView"); 3147 } 3148 3149 // addViewInner() will call child.requestLayout() when setting the new LayoutParams 3150 // therefore, we call requestLayout() on ourselves before, so that the child's request 3151 // will be blocked at our level 3152 requestLayout(); 3153 invalidate(true); 3154 addViewInner(child, index, params, false); 3155 } 3156 3157 /** 3158 * {@inheritDoc} 3159 */ 3160 public void updateViewLayout(View view, ViewGroup.LayoutParams params) { 3161 if (!checkLayoutParams(params)) { 3162 throw new IllegalArgumentException("Invalid LayoutParams supplied to " + this); 3163 } 3164 if (view.mParent != this) { 3165 throw new IllegalArgumentException("Given view not a child of " + this); 3166 } 3167 view.setLayoutParams(params); 3168 } 3169 3170 /** 3171 * {@inheritDoc} 3172 */ 3173 protected boolean checkLayoutParams(ViewGroup.LayoutParams p) { 3174 return p != null; 3175 } 3176 3177 /** 3178 * Interface definition for a callback to be invoked when the hierarchy 3179 * within this view changed. The hierarchy changes whenever a child is added 3180 * to or removed from this view. 3181 */ 3182 public interface OnHierarchyChangeListener { 3183 /** 3184 * Called when a new child is added to a parent view. 3185 * 3186 * @param parent the view in which a child was added 3187 * @param child the new child view added in the hierarchy 3188 */ 3189 void onChildViewAdded(View parent, View child); 3190 3191 /** 3192 * Called when a child is removed from a parent view. 3193 * 3194 * @param parent the view from which the child was removed 3195 * @param child the child removed from the hierarchy 3196 */ 3197 void onChildViewRemoved(View parent, View child); 3198 } 3199 3200 /** 3201 * Register a callback to be invoked when a child is added to or removed 3202 * from this view. 3203 * 3204 * @param listener the callback to invoke on hierarchy change 3205 */ 3206 public void setOnHierarchyChangeListener(OnHierarchyChangeListener listener) { 3207 mOnHierarchyChangeListener = listener; 3208 } 3209 3210 /** 3211 * @hide 3212 */ 3213 protected void onViewAdded(View child) { 3214 if (mOnHierarchyChangeListener != null) { 3215 mOnHierarchyChangeListener.onChildViewAdded(this, child); 3216 } 3217 } 3218 3219 /** 3220 * @hide 3221 */ 3222 protected void onViewRemoved(View child) { 3223 if (mOnHierarchyChangeListener != null) { 3224 mOnHierarchyChangeListener.onChildViewRemoved(this, child); 3225 } 3226 } 3227 3228 /** 3229 * Adds a view during layout. This is useful if in your onLayout() method, 3230 * you need to add more views (as does the list view for example). 3231 * 3232 * If index is negative, it means put it at the end of the list. 3233 * 3234 * @param child the view to add to the group 3235 * @param index the index at which the child must be added 3236 * @param params the layout parameters to associate with the child 3237 * @return true if the child was added, false otherwise 3238 */ 3239 protected boolean addViewInLayout(View child, int index, LayoutParams params) { 3240 return addViewInLayout(child, index, params, false); 3241 } 3242 3243 /** 3244 * Adds a view during layout. This is useful if in your onLayout() method, 3245 * you need to add more views (as does the list view for example). 3246 * 3247 * If index is negative, it means put it at the end of the list. 3248 * 3249 * @param child the view to add to the group 3250 * @param index the index at which the child must be added 3251 * @param params the layout parameters to associate with the child 3252 * @param preventRequestLayout if true, calling this method will not trigger a 3253 * layout request on child 3254 * @return true if the child was added, false otherwise 3255 */ 3256 protected boolean addViewInLayout(View child, int index, LayoutParams params, 3257 boolean preventRequestLayout) { 3258 child.mParent = null; 3259 addViewInner(child, index, params, preventRequestLayout); 3260 child.mPrivateFlags = (child.mPrivateFlags & ~DIRTY_MASK) | DRAWN; 3261 return true; 3262 } 3263 3264 /** 3265 * Prevents the specified child to be laid out during the next layout pass. 3266 * 3267 * @param child the child on which to perform the cleanup 3268 */ 3269 protected void cleanupLayoutState(View child) { 3270 child.mPrivateFlags &= ~View.FORCE_LAYOUT; 3271 } 3272 3273 private void addViewInner(View child, int index, LayoutParams params, 3274 boolean preventRequestLayout) { 3275 3276 if (mTransition != null) { 3277 // Don't prevent other add transitions from completing, but cancel remove 3278 // transitions to let them complete the process before we add to the container 3279 mTransition.cancel(LayoutTransition.DISAPPEARING); 3280 } 3281 3282 if (child.getParent() != null) { 3283 throw new IllegalStateException("The specified child already has a parent. " + 3284 "You must call removeView() on the child's parent first."); 3285 } 3286 3287 if (mTransition != null) { 3288 mTransition.addChild(this, child); 3289 } 3290 3291 if (!checkLayoutParams(params)) { 3292 params = generateLayoutParams(params); 3293 } 3294 3295 if (preventRequestLayout) { 3296 child.mLayoutParams = params; 3297 } else { 3298 child.setLayoutParams(params); 3299 } 3300 3301 if (index < 0) { 3302 index = mChildrenCount; 3303 } 3304 3305 addInArray(child, index); 3306 3307 // tell our children 3308 if (preventRequestLayout) { 3309 child.assignParent(this); 3310 } else { 3311 child.mParent = this; 3312 } 3313 3314 if (child.hasFocus()) { 3315 requestChildFocus(child, child.findFocus()); 3316 } 3317 3318 AttachInfo ai = mAttachInfo; 3319 if (ai != null && (mGroupFlags & FLAG_PREVENT_DISPATCH_ATTACHED_TO_WINDOW) == 0) { 3320 boolean lastKeepOn = ai.mKeepScreenOn; 3321 ai.mKeepScreenOn = false; 3322 child.dispatchAttachedToWindow(mAttachInfo, (mViewFlags&VISIBILITY_MASK)); 3323 if (ai.mKeepScreenOn) { 3324 needGlobalAttributesUpdate(true); 3325 } 3326 ai.mKeepScreenOn = lastKeepOn; 3327 } 3328 3329 onViewAdded(child); 3330 3331 if ((child.mViewFlags & DUPLICATE_PARENT_STATE) == DUPLICATE_PARENT_STATE) { 3332 mGroupFlags |= FLAG_NOTIFY_CHILDREN_ON_DRAWABLE_STATE_CHANGE; 3333 } 3334 3335 if (child.hasTransientState()) { 3336 childHasTransientStateChanged(child, true); 3337 } 3338 } 3339 3340 private void addInArray(View child, int index) { 3341 View[] children = mChildren; 3342 final int count = mChildrenCount; 3343 final int size = children.length; 3344 if (index == count) { 3345 if (size == count) { 3346 mChildren = new View[size + ARRAY_CAPACITY_INCREMENT]; 3347 System.arraycopy(children, 0, mChildren, 0, size); 3348 children = mChildren; 3349 } 3350 children[mChildrenCount++] = child; 3351 } else if (index < count) { 3352 if (size == count) { 3353 mChildren = new View[size + ARRAY_CAPACITY_INCREMENT]; 3354 System.arraycopy(children, 0, mChildren, 0, index); 3355 System.arraycopy(children, index, mChildren, index + 1, count - index); 3356 children = mChildren; 3357 } else { 3358 System.arraycopy(children, index, children, index + 1, count - index); 3359 } 3360 children[index] = child; 3361 mChildrenCount++; 3362 if (mLastTouchDownIndex >= index) { 3363 mLastTouchDownIndex++; 3364 } 3365 } else { 3366 throw new IndexOutOfBoundsException("index=" + index + " count=" + count); 3367 } 3368 } 3369 3370 // This method also sets the child's mParent to null 3371 private void removeFromArray(int index) { 3372 final View[] children = mChildren; 3373 if (!(mTransitioningViews != null && mTransitioningViews.contains(children[index]))) { 3374 children[index].mParent = null; 3375 } 3376 final int count = mChildrenCount; 3377 if (index == count - 1) { 3378 children[--mChildrenCount] = null; 3379 } else if (index >= 0 && index < count) { 3380 System.arraycopy(children, index + 1, children, index, count - index - 1); 3381 children[--mChildrenCount] = null; 3382 } else { 3383 throw new IndexOutOfBoundsException(); 3384 } 3385 if (mLastTouchDownIndex == index) { 3386 mLastTouchDownTime = 0; 3387 mLastTouchDownIndex = -1; 3388 } else if (mLastTouchDownIndex > index) { 3389 mLastTouchDownIndex--; 3390 } 3391 } 3392 3393 // This method also sets the children's mParent to null 3394 private void removeFromArray(int start, int count) { 3395 final View[] children = mChildren; 3396 final int childrenCount = mChildrenCount; 3397 3398 start = Math.max(0, start); 3399 final int end = Math.min(childrenCount, start + count); 3400 3401 if (start == end) { 3402 return; 3403 } 3404 3405 if (end == childrenCount) { 3406 for (int i = start; i < end; i++) { 3407 children[i].mParent = null; 3408 children[i] = null; 3409 } 3410 } else { 3411 for (int i = start; i < end; i++) { 3412 children[i].mParent = null; 3413 } 3414 3415 // Since we're looping above, we might as well do the copy, but is arraycopy() 3416 // faster than the extra 2 bounds checks we would do in the loop? 3417 System.arraycopy(children, end, children, start, childrenCount - end); 3418 3419 for (int i = childrenCount - (end - start); i < childrenCount; i++) { 3420 children[i] = null; 3421 } 3422 } 3423 3424 mChildrenCount -= (end - start); 3425 } 3426 3427 private void bindLayoutAnimation(View child) { 3428 Animation a = mLayoutAnimationController.getAnimationForView(child); 3429 child.setAnimation(a); 3430 } 3431 3432 /** 3433 * Subclasses should override this method to set layout animation 3434 * parameters on the supplied child. 3435 * 3436 * @param child the child to associate with animation parameters 3437 * @param params the child's layout parameters which hold the animation 3438 * parameters 3439 * @param index the index of the child in the view group 3440 * @param count the number of children in the view group 3441 */ 3442 protected void attachLayoutAnimationParameters(View child, 3443 LayoutParams params, int index, int count) { 3444 LayoutAnimationController.AnimationParameters animationParams = 3445 params.layoutAnimationParameters; 3446 if (animationParams == null) { 3447 animationParams = new LayoutAnimationController.AnimationParameters(); 3448 params.layoutAnimationParameters = animationParams; 3449 } 3450 3451 animationParams.count = count; 3452 animationParams.index = index; 3453 } 3454 3455 /** 3456 * {@inheritDoc} 3457 */ 3458 public void removeView(View view) { 3459 removeViewInternal(view); 3460 requestLayout(); 3461 invalidate(true); 3462 } 3463 3464 /** 3465 * Removes a view during layout. This is useful if in your onLayout() method, 3466 * you need to remove more views. 3467 * 3468 * @param view the view to remove from the group 3469 */ 3470 public void removeViewInLayout(View view) { 3471 removeViewInternal(view); 3472 } 3473 3474 /** 3475 * Removes a range of views during layout. This is useful if in your onLayout() method, 3476 * you need to remove more views. 3477 * 3478 * @param start the index of the first view to remove from the group 3479 * @param count the number of views to remove from the group 3480 */ 3481 public void removeViewsInLayout(int start, int count) { 3482 removeViewsInternal(start, count); 3483 } 3484 3485 /** 3486 * Removes the view at the specified position in the group. 3487 * 3488 * @param index the position in the group of the view to remove 3489 */ 3490 public void removeViewAt(int index) { 3491 removeViewInternal(index, getChildAt(index)); 3492 requestLayout(); 3493 invalidate(true); 3494 } 3495 3496 /** 3497 * Removes the specified range of views from the group. 3498 * 3499 * @param start the first position in the group of the range of views to remove 3500 * @param count the number of views to remove 3501 */ 3502 public void removeViews(int start, int count) { 3503 removeViewsInternal(start, count); 3504 requestLayout(); 3505 invalidate(true); 3506 } 3507 3508 private void removeViewInternal(View view) { 3509 final int index = indexOfChild(view); 3510 if (index >= 0) { 3511 removeViewInternal(index, view); 3512 } 3513 } 3514 3515 private void removeViewInternal(int index, View view) { 3516 3517 if (mTransition != null) { 3518 mTransition.removeChild(this, view); 3519 } 3520 3521 boolean clearChildFocus = false; 3522 if (view == mFocused) { 3523 view.unFocus(); 3524 clearChildFocus = true; 3525 } 3526 3527 cancelTouchTarget(view); 3528 cancelHoverTarget(view); 3529 3530 if (view.getAnimation() != null || 3531 (mTransitioningViews != null && mTransitioningViews.contains(view))) { 3532 addDisappearingView(view); 3533 } else if (view.mAttachInfo != null) { 3534 view.dispatchDetachedFromWindow(); 3535 } 3536 3537 if (view.hasTransientState()) { 3538 childHasTransientStateChanged(view, false); 3539 } 3540 3541 onViewRemoved(view); 3542 3543 needGlobalAttributesUpdate(false); 3544 3545 removeFromArray(index); 3546 3547 if (clearChildFocus) { 3548 clearChildFocus(view); 3549 ensureInputFocusOnFirstFocusable(); 3550 } 3551 3552 if (view.isAccessibilityFocused()) { 3553 view.clearAccessibilityFocus(); 3554 } 3555 } 3556 3557 /** 3558 * Sets the LayoutTransition object for this ViewGroup. If the LayoutTransition object is 3559 * not null, changes in layout which occur because of children being added to or removed from 3560 * the ViewGroup will be animated according to the animations defined in that LayoutTransition 3561 * object. By default, the transition object is null (so layout changes are not animated). 3562 * 3563 * @param transition The LayoutTransition object that will animated changes in layout. A value 3564 * of <code>null</code> means no transition will run on layout changes. 3565 * @attr ref android.R.styleable#ViewGroup_animateLayoutChanges 3566 */ 3567 public void setLayoutTransition(LayoutTransition transition) { 3568 if (mTransition != null) { 3569 mTransition.removeTransitionListener(mLayoutTransitionListener); 3570 } 3571 mTransition = transition; 3572 if (mTransition != null) { 3573 mTransition.addTransitionListener(mLayoutTransitionListener); 3574 } 3575 } 3576 3577 /** 3578 * Gets the LayoutTransition object for this ViewGroup. If the LayoutTransition object is 3579 * not null, changes in layout which occur because of children being added to or removed from 3580 * the ViewGroup will be animated according to the animations defined in that LayoutTransition 3581 * object. By default, the transition object is null (so layout changes are not animated). 3582 * 3583 * @return LayoutTranstion The LayoutTransition object that will animated changes in layout. 3584 * A value of <code>null</code> means no transition will run on layout changes. 3585 */ 3586 public LayoutTransition getLayoutTransition() { 3587 return mTransition; 3588 } 3589 3590 private void removeViewsInternal(int start, int count) { 3591 final View focused = mFocused; 3592 final boolean detach = mAttachInfo != null; 3593 View clearChildFocus = null; 3594 3595 final View[] children = mChildren; 3596 final int end = start + count; 3597 3598 for (int i = start; i < end; i++) { 3599 final View view = children[i]; 3600 3601 if (mTransition != null) { 3602 mTransition.removeChild(this, view); 3603 } 3604 3605 if (view == focused) { 3606 view.unFocus(); 3607 clearChildFocus = view; 3608 } 3609 3610 cancelTouchTarget(view); 3611 cancelHoverTarget(view); 3612 3613 if (view.getAnimation() != null || 3614 (mTransitioningViews != null && mTransitioningViews.contains(view))) { 3615 addDisappearingView(view); 3616 } else if (detach) { 3617 view.dispatchDetachedFromWindow(); 3618 } 3619 3620 if (view.hasTransientState()) { 3621 childHasTransientStateChanged(view, false); 3622 } 3623 3624 needGlobalAttributesUpdate(false); 3625 3626 onViewRemoved(view); 3627 } 3628 3629 removeFromArray(start, count); 3630 3631 if (clearChildFocus != null) { 3632 clearChildFocus(clearChildFocus); 3633 ensureInputFocusOnFirstFocusable(); 3634 } 3635 } 3636 3637 /** 3638 * Call this method to remove all child views from the 3639 * ViewGroup. 3640 */ 3641 public void removeAllViews() { 3642 removeAllViewsInLayout(); 3643 requestLayout(); 3644 invalidate(true); 3645 } 3646 3647 /** 3648 * Called by a ViewGroup subclass to remove child views from itself, 3649 * when it must first know its size on screen before it can calculate how many 3650 * child views it will render. An example is a Gallery or a ListView, which 3651 * may "have" 50 children, but actually only render the number of children 3652 * that can currently fit inside the object on screen. Do not call 3653 * this method unless you are extending ViewGroup and understand the 3654 * view measuring and layout pipeline. 3655 */ 3656 public void removeAllViewsInLayout() { 3657 final int count = mChildrenCount; 3658 if (count <= 0) { 3659 return; 3660 } 3661 3662 final View[] children = mChildren; 3663 mChildrenCount = 0; 3664 3665 final View focused = mFocused; 3666 final boolean detach = mAttachInfo != null; 3667 View clearChildFocus = null; 3668 3669 needGlobalAttributesUpdate(false); 3670 3671 for (int i = count - 1; i >= 0; i--) { 3672 final View view = children[i]; 3673 3674 if (mTransition != null) { 3675 mTransition.removeChild(this, view); 3676 } 3677 3678 if (view == focused) { 3679 view.unFocus(); 3680 clearChildFocus = view; 3681 } 3682 3683 cancelTouchTarget(view); 3684 cancelHoverTarget(view); 3685 3686 if (view.getAnimation() != null || 3687 (mTransitioningViews != null && mTransitioningViews.contains(view))) { 3688 addDisappearingView(view); 3689 } else if (detach) { 3690 view.dispatchDetachedFromWindow(); 3691 } 3692 3693 if (view.hasTransientState()) { 3694 childHasTransientStateChanged(view, false); 3695 } 3696 3697 onViewRemoved(view); 3698 3699 view.mParent = null; 3700 children[i] = null; 3701 } 3702 3703 if (clearChildFocus != null) { 3704 clearChildFocus(clearChildFocus); 3705 ensureInputFocusOnFirstFocusable(); 3706 } 3707 } 3708 3709 /** 3710 * Finishes the removal of a detached view. This method will dispatch the detached from 3711 * window event and notify the hierarchy change listener. 3712 * 3713 * @param child the child to be definitely removed from the view hierarchy 3714 * @param animate if true and the view has an animation, the view is placed in the 3715 * disappearing views list, otherwise, it is detached from the window 3716 * 3717 * @see #attachViewToParent(View, int, android.view.ViewGroup.LayoutParams) 3718 * @see #detachAllViewsFromParent() 3719 * @see #detachViewFromParent(View) 3720 * @see #detachViewFromParent(int) 3721 */ 3722 protected void removeDetachedView(View child, boolean animate) { 3723 if (mTransition != null) { 3724 mTransition.removeChild(this, child); 3725 } 3726 3727 if (child == mFocused) { 3728 child.clearFocus(); 3729 } 3730 3731 cancelTouchTarget(child); 3732 cancelHoverTarget(child); 3733 3734 if ((animate && child.getAnimation() != null) || 3735 (mTransitioningViews != null && mTransitioningViews.contains(child))) { 3736 addDisappearingView(child); 3737 } else if (child.mAttachInfo != null) { 3738 child.dispatchDetachedFromWindow(); 3739 } 3740 3741 if (child.hasTransientState()) { 3742 childHasTransientStateChanged(child, false); 3743 } 3744 3745 onViewRemoved(child); 3746 } 3747 3748 /** 3749 * Attaches a view to this view group. Attaching a view assigns this group as the parent, 3750 * sets the layout parameters and puts the view in the list of children so it can be retrieved 3751 * by calling {@link #getChildAt(int)}. 3752 * 3753 * This method should be called only for view which were detached from their parent. 3754 * 3755 * @param child the child to attach 3756 * @param index the index at which the child should be attached 3757 * @param params the layout parameters of the child 3758 * 3759 * @see #removeDetachedView(View, boolean) 3760 * @see #detachAllViewsFromParent() 3761 * @see #detachViewFromParent(View) 3762 * @see #detachViewFromParent(int) 3763 */ 3764 protected void attachViewToParent(View child, int index, LayoutParams params) { 3765 child.mLayoutParams = params; 3766 3767 if (index < 0) { 3768 index = mChildrenCount; 3769 } 3770 3771 addInArray(child, index); 3772 3773 child.mParent = this; 3774 child.mPrivateFlags = (child.mPrivateFlags & ~DIRTY_MASK & ~DRAWING_CACHE_VALID) | 3775 DRAWN | INVALIDATED; 3776 this.mPrivateFlags |= INVALIDATED; 3777 3778 if (child.hasFocus()) { 3779 requestChildFocus(child, child.findFocus()); 3780 } 3781 } 3782 3783 /** 3784 * Detaches a view from its parent. Detaching a view should be temporary and followed 3785 * either by a call to {@link #attachViewToParent(View, int, android.view.ViewGroup.LayoutParams)} 3786 * or a call to {@link #removeDetachedView(View, boolean)}. When a view is detached, 3787 * its parent is null and cannot be retrieved by a call to {@link #getChildAt(int)}. 3788 * 3789 * @param child the child to detach 3790 * 3791 * @see #detachViewFromParent(int) 3792 * @see #detachViewsFromParent(int, int) 3793 * @see #detachAllViewsFromParent() 3794 * @see #attachViewToParent(View, int, android.view.ViewGroup.LayoutParams) 3795 * @see #removeDetachedView(View, boolean) 3796 */ 3797 protected void detachViewFromParent(View child) { 3798 removeFromArray(indexOfChild(child)); 3799 } 3800 3801 /** 3802 * Detaches a view from its parent. Detaching a view should be temporary and followed 3803 * either by a call to {@link #attachViewToParent(View, int, android.view.ViewGroup.LayoutParams)} 3804 * or a call to {@link #removeDetachedView(View, boolean)}. When a view is detached, 3805 * its parent is null and cannot be retrieved by a call to {@link #getChildAt(int)}. 3806 * 3807 * @param index the index of the child to detach 3808 * 3809 * @see #detachViewFromParent(View) 3810 * @see #detachAllViewsFromParent() 3811 * @see #detachViewsFromParent(int, int) 3812 * @see #attachViewToParent(View, int, android.view.ViewGroup.LayoutParams) 3813 * @see #removeDetachedView(View, boolean) 3814 */ 3815 protected void detachViewFromParent(int index) { 3816 removeFromArray(index); 3817 } 3818 3819 /** 3820 * Detaches a range of view from their parent. Detaching a view should be temporary and followed 3821 * either by a call to {@link #attachViewToParent(View, int, android.view.ViewGroup.LayoutParams)} 3822 * or a call to {@link #removeDetachedView(View, boolean)}. When a view is detached, its 3823 * parent is null and cannot be retrieved by a call to {@link #getChildAt(int)}. 3824 * 3825 * @param start the first index of the childrend range to detach 3826 * @param count the number of children to detach 3827 * 3828 * @see #detachViewFromParent(View) 3829 * @see #detachViewFromParent(int) 3830 * @see #detachAllViewsFromParent() 3831 * @see #attachViewToParent(View, int, android.view.ViewGroup.LayoutParams) 3832 * @see #removeDetachedView(View, boolean) 3833 */ 3834 protected void detachViewsFromParent(int start, int count) { 3835 removeFromArray(start, count); 3836 } 3837 3838 /** 3839 * Detaches all views from the parent. Detaching a view should be temporary and followed 3840 * either by a call to {@link #attachViewToParent(View, int, android.view.ViewGroup.LayoutParams)} 3841 * or a call to {@link #removeDetachedView(View, boolean)}. When a view is detached, 3842 * its parent is null and cannot be retrieved by a call to {@link #getChildAt(int)}. 3843 * 3844 * @see #detachViewFromParent(View) 3845 * @see #detachViewFromParent(int) 3846 * @see #detachViewsFromParent(int, int) 3847 * @see #attachViewToParent(View, int, android.view.ViewGroup.LayoutParams) 3848 * @see #removeDetachedView(View, boolean) 3849 */ 3850 protected void detachAllViewsFromParent() { 3851 final int count = mChildrenCount; 3852 if (count <= 0) { 3853 return; 3854 } 3855 3856 final View[] children = mChildren; 3857 mChildrenCount = 0; 3858 3859 for (int i = count - 1; i >= 0; i--) { 3860 children[i].mParent = null; 3861 children[i] = null; 3862 } 3863 } 3864 3865 /** 3866 * Don't call or override this method. It is used for the implementation of 3867 * the view hierarchy. 3868 */ 3869 public final void invalidateChild(View child, final Rect dirty) { 3870 if (ViewDebug.TRACE_HIERARCHY) { 3871 ViewDebug.trace(this, ViewDebug.HierarchyTraceType.INVALIDATE_CHILD); 3872 } 3873 3874 ViewParent parent = this; 3875 3876 final AttachInfo attachInfo = mAttachInfo; 3877 if (attachInfo != null) { 3878 // If the child is drawing an animation, we want to copy this flag onto 3879 // ourselves and the parent to make sure the invalidate request goes 3880 // through 3881 final boolean drawAnimation = (child.mPrivateFlags & DRAW_ANIMATION) == DRAW_ANIMATION; 3882 3883 //noinspection PointlessBooleanExpression 3884 if (!HardwareRenderer.RENDER_DIRTY_REGIONS) { 3885 if (dirty == null) { 3886 if (child.mLayerType != LAYER_TYPE_NONE) { 3887 mPrivateFlags |= INVALIDATED; 3888 mPrivateFlags &= ~DRAWING_CACHE_VALID; 3889 child.mLocalDirtyRect.setEmpty(); 3890 } 3891 do { 3892 View view = null; 3893 if (parent instanceof View) { 3894 view = (View) parent; 3895 if (view.mLayerType != LAYER_TYPE_NONE) { 3896 view.mLocalDirtyRect.setEmpty(); 3897 if (view.getParent() instanceof View) { 3898 final View grandParent = (View) view.getParent(); 3899 grandParent.mPrivateFlags |= INVALIDATED; 3900 grandParent.mPrivateFlags &= ~DRAWING_CACHE_VALID; 3901 } 3902 } 3903 if ((view.mPrivateFlags & DIRTY_MASK) != 0) { 3904 // already marked dirty - we're done 3905 break; 3906 } 3907 } 3908 3909 if (drawAnimation) { 3910 if (view != null) { 3911 view.mPrivateFlags |= DRAW_ANIMATION; 3912 } else if (parent instanceof ViewRootImpl) { 3913 ((ViewRootImpl) parent).mIsAnimating = true; 3914 } 3915 } 3916 3917 if (parent instanceof ViewRootImpl) { 3918 ((ViewRootImpl) parent).invalidate(); 3919 parent = null; 3920 } else if (view != null) { 3921 if ((view.mPrivateFlags & DRAWN) == DRAWN || 3922 (view.mPrivateFlags & DRAWING_CACHE_VALID) == DRAWING_CACHE_VALID) { 3923 view.mPrivateFlags &= ~DRAWING_CACHE_VALID; 3924 view.mPrivateFlags |= DIRTY; 3925 parent = view.mParent; 3926 } else { 3927 parent = null; 3928 } 3929 } 3930 } while (parent != null); 3931 } 3932 3933 return; 3934 } 3935 3936 // Check whether the child that requests the invalidate is fully opaque 3937 // Views being animated or transformed are not considered opaque because we may 3938 // be invalidating their old position and need the parent to paint behind them. 3939 Matrix childMatrix = child.getMatrix(); 3940 final boolean isOpaque = child.isOpaque() && !drawAnimation && 3941 child.getAnimation() == null && childMatrix.isIdentity(); 3942 // Mark the child as dirty, using the appropriate flag 3943 // Make sure we do not set both flags at the same time 3944 int opaqueFlag = isOpaque ? DIRTY_OPAQUE : DIRTY; 3945 3946 if (child.mLayerType != LAYER_TYPE_NONE) { 3947 mPrivateFlags |= INVALIDATED; 3948 mPrivateFlags &= ~DRAWING_CACHE_VALID; 3949 child.mLocalDirtyRect.union(dirty); 3950 } 3951 3952 final int[] location = attachInfo.mInvalidateChildLocation; 3953 location[CHILD_LEFT_INDEX] = child.mLeft; 3954 location[CHILD_TOP_INDEX] = child.mTop; 3955 if (!childMatrix.isIdentity()) { 3956 RectF boundingRect = attachInfo.mTmpTransformRect; 3957 boundingRect.set(dirty); 3958 //boundingRect.inset(-0.5f, -0.5f); 3959 childMatrix.mapRect(boundingRect); 3960 dirty.set((int) (boundingRect.left - 0.5f), 3961 (int) (boundingRect.top - 0.5f), 3962 (int) (boundingRect.right + 0.5f), 3963 (int) (boundingRect.bottom + 0.5f)); 3964 } 3965 3966 do { 3967 View view = null; 3968 if (parent instanceof View) { 3969 view = (View) parent; 3970 if (view.mLayerType != LAYER_TYPE_NONE && 3971 view.getParent() instanceof View) { 3972 final View grandParent = (View) view.getParent(); 3973 grandParent.mPrivateFlags |= INVALIDATED; 3974 grandParent.mPrivateFlags &= ~DRAWING_CACHE_VALID; 3975 } 3976 } 3977 3978 if (drawAnimation) { 3979 if (view != null) { 3980 view.mPrivateFlags |= DRAW_ANIMATION; 3981 } else if (parent instanceof ViewRootImpl) { 3982 ((ViewRootImpl) parent).mIsAnimating = true; 3983 } 3984 } 3985 3986 // If the parent is dirty opaque or not dirty, mark it dirty with the opaque 3987 // flag coming from the child that initiated the invalidate 3988 if (view != null) { 3989 if ((view.mViewFlags & FADING_EDGE_MASK) != 0 && 3990 view.getSolidColor() == 0) { 3991 opaqueFlag = DIRTY; 3992 } 3993 if ((view.mPrivateFlags & DIRTY_MASK) != DIRTY) { 3994 view.mPrivateFlags = (view.mPrivateFlags & ~DIRTY_MASK) | opaqueFlag; 3995 } 3996 } 3997 3998 parent = parent.invalidateChildInParent(location, dirty); 3999 if (view != null) { 4000 // Account for transform on current parent 4001 Matrix m = view.getMatrix(); 4002 if (!m.isIdentity()) { 4003 RectF boundingRect = attachInfo.mTmpTransformRect; 4004 boundingRect.set(dirty); 4005 m.mapRect(boundingRect); 4006 dirty.set((int) (boundingRect.left - 0.5f), 4007 (int) (boundingRect.top - 0.5f), 4008 (int) (boundingRect.right + 0.5f), 4009 (int) (boundingRect.bottom + 0.5f)); 4010 } 4011 } 4012 } while (parent != null); 4013 } 4014 } 4015 4016 /** 4017 * Don't call or override this method. It is used for the implementation of 4018 * the view hierarchy. 4019 * 4020 * This implementation returns null if this ViewGroup does not have a parent, 4021 * if this ViewGroup is already fully invalidated or if the dirty rectangle 4022 * does not intersect with this ViewGroup's bounds. 4023 */ 4024 public ViewParent invalidateChildInParent(final int[] location, final Rect dirty) { 4025 if (ViewDebug.TRACE_HIERARCHY) { 4026 ViewDebug.trace(this, ViewDebug.HierarchyTraceType.INVALIDATE_CHILD_IN_PARENT); 4027 } 4028 4029 if ((mPrivateFlags & DRAWN) == DRAWN || 4030 (mPrivateFlags & DRAWING_CACHE_VALID) == DRAWING_CACHE_VALID) { 4031 if ((mGroupFlags & (FLAG_OPTIMIZE_INVALIDATE | FLAG_ANIMATION_DONE)) != 4032 FLAG_OPTIMIZE_INVALIDATE) { 4033 dirty.offset(location[CHILD_LEFT_INDEX] - mScrollX, 4034 location[CHILD_TOP_INDEX] - mScrollY); 4035 4036 final int left = mLeft; 4037 final int top = mTop; 4038 4039 if ((mGroupFlags & FLAG_CLIP_CHILDREN) != FLAG_CLIP_CHILDREN || 4040 dirty.intersect(0, 0, mRight - left, mBottom - top) || 4041 (mPrivateFlags & DRAW_ANIMATION) == DRAW_ANIMATION) { 4042 mPrivateFlags &= ~DRAWING_CACHE_VALID; 4043 4044 location[CHILD_LEFT_INDEX] = left; 4045 location[CHILD_TOP_INDEX] = top; 4046 4047 if (mLayerType != LAYER_TYPE_NONE) { 4048 mLocalDirtyRect.union(dirty); 4049 } 4050 4051 return mParent; 4052 } 4053 } else { 4054 mPrivateFlags &= ~DRAWN & ~DRAWING_CACHE_VALID; 4055 4056 location[CHILD_LEFT_INDEX] = mLeft; 4057 location[CHILD_TOP_INDEX] = mTop; 4058 if ((mGroupFlags & FLAG_CLIP_CHILDREN) == FLAG_CLIP_CHILDREN) { 4059 dirty.set(0, 0, mRight - mLeft, mBottom - mTop); 4060 } else { 4061 // in case the dirty rect extends outside the bounds of this container 4062 dirty.union(0, 0, mRight - mLeft, mBottom - mTop); 4063 } 4064 4065 if (mLayerType != LAYER_TYPE_NONE) { 4066 mLocalDirtyRect.union(dirty); 4067 } 4068 4069 return mParent; 4070 } 4071 } 4072 4073 return null; 4074 } 4075 4076 /** 4077 * Quick invalidation method called by View.invalidateViewProperty. This doesn't set the 4078 * DRAWN flags and doesn't handle the Animation logic that the default invalidation methods 4079 * do; all we want to do here is schedule a traversal with the appropriate dirty rect. 4080 * 4081 * @hide 4082 */ 4083 public void invalidateChildFast(View child, final Rect dirty) { 4084 ViewParent parent = this; 4085 4086 final AttachInfo attachInfo = mAttachInfo; 4087 if (attachInfo != null) { 4088 if (child.mLayerType != LAYER_TYPE_NONE) { 4089 child.mLocalDirtyRect.union(dirty); 4090 } 4091 4092 int left = child.mLeft; 4093 int top = child.mTop; 4094 if (!child.getMatrix().isIdentity()) { 4095 child.transformRect(dirty); 4096 } 4097 4098 do { 4099 if (parent instanceof ViewGroup) { 4100 ViewGroup parentVG = (ViewGroup) parent; 4101 if (parentVG.mLayerType != LAYER_TYPE_NONE) { 4102 // Layered parents should be recreated, not just re-issued 4103 parentVG.invalidate(); 4104 parent = null; 4105 } else { 4106 parent = parentVG.invalidateChildInParentFast(left, top, dirty); 4107 left = parentVG.mLeft; 4108 top = parentVG.mTop; 4109 } 4110 } else { 4111 // Reached the top; this calls into the usual invalidate method in 4112 // ViewRootImpl, which schedules a traversal 4113 final int[] location = attachInfo.mInvalidateChildLocation; 4114 location[0] = left; 4115 location[1] = top; 4116 parent = parent.invalidateChildInParent(location, dirty); 4117 } 4118 } while (parent != null); 4119 } 4120 } 4121 4122 /** 4123 * Quick invalidation method that simply transforms the dirty rect into the parent's 4124 * coordinate system, pruning the invalidation if the parent has already been invalidated. 4125 */ 4126 private ViewParent invalidateChildInParentFast(int left, int top, final Rect dirty) { 4127 if ((mPrivateFlags & DRAWN) == DRAWN || 4128 (mPrivateFlags & DRAWING_CACHE_VALID) == DRAWING_CACHE_VALID) { 4129 dirty.offset(left - mScrollX, top - mScrollY); 4130 4131 if ((mGroupFlags & FLAG_CLIP_CHILDREN) == 0 || 4132 dirty.intersect(0, 0, mRight - mLeft, mBottom - mTop)) { 4133 4134 if (mLayerType != LAYER_TYPE_NONE) { 4135 mLocalDirtyRect.union(dirty); 4136 } 4137 if (!getMatrix().isIdentity()) { 4138 transformRect(dirty); 4139 } 4140 4141 return mParent; 4142 } 4143 } 4144 4145 return null; 4146 } 4147 4148 /** 4149 * Offset a rectangle that is in a descendant's coordinate 4150 * space into our coordinate space. 4151 * @param descendant A descendant of this view 4152 * @param rect A rectangle defined in descendant's coordinate space. 4153 */ 4154 public final void offsetDescendantRectToMyCoords(View descendant, Rect rect) { 4155 offsetRectBetweenParentAndChild(descendant, rect, true, false); 4156 } 4157 4158 /** 4159 * Offset a rectangle that is in our coordinate space into an ancestor's 4160 * coordinate space. 4161 * @param descendant A descendant of this view 4162 * @param rect A rectangle defined in descendant's coordinate space. 4163 */ 4164 public final void offsetRectIntoDescendantCoords(View descendant, Rect rect) { 4165 offsetRectBetweenParentAndChild(descendant, rect, false, false); 4166 } 4167 4168 /** 4169 * Helper method that offsets a rect either from parent to descendant or 4170 * descendant to parent. 4171 */ 4172 void offsetRectBetweenParentAndChild(View descendant, Rect rect, 4173 boolean offsetFromChildToParent, boolean clipToBounds) { 4174 4175 // already in the same coord system :) 4176 if (descendant == this) { 4177 return; 4178 } 4179 4180 ViewParent theParent = descendant.mParent; 4181 4182 // search and offset up to the parent 4183 while ((theParent != null) 4184 && (theParent instanceof View) 4185 && (theParent != this)) { 4186 4187 if (offsetFromChildToParent) { 4188 rect.offset(descendant.mLeft - descendant.mScrollX, 4189 descendant.mTop - descendant.mScrollY); 4190 if (clipToBounds) { 4191 View p = (View) theParent; 4192 rect.intersect(0, 0, p.mRight - p.mLeft, p.mBottom - p.mTop); 4193 } 4194 } else { 4195 if (clipToBounds) { 4196 View p = (View) theParent; 4197 rect.intersect(0, 0, p.mRight - p.mLeft, p.mBottom - p.mTop); 4198 } 4199 rect.offset(descendant.mScrollX - descendant.mLeft, 4200 descendant.mScrollY - descendant.mTop); 4201 } 4202 4203 descendant = (View) theParent; 4204 theParent = descendant.mParent; 4205 } 4206 4207 // now that we are up to this view, need to offset one more time 4208 // to get into our coordinate space 4209 if (theParent == this) { 4210 if (offsetFromChildToParent) { 4211 rect.offset(descendant.mLeft - descendant.mScrollX, 4212 descendant.mTop - descendant.mScrollY); 4213 } else { 4214 rect.offset(descendant.mScrollX - descendant.mLeft, 4215 descendant.mScrollY - descendant.mTop); 4216 } 4217 } else { 4218 throw new IllegalArgumentException("parameter must be a descendant of this view"); 4219 } 4220 } 4221 4222 /** 4223 * Offset the vertical location of all children of this view by the specified number of pixels. 4224 * 4225 * @param offset the number of pixels to offset 4226 * 4227 * @hide 4228 */ 4229 public void offsetChildrenTopAndBottom(int offset) { 4230 final int count = mChildrenCount; 4231 final View[] children = mChildren; 4232 4233 for (int i = 0; i < count; i++) { 4234 final View v = children[i]; 4235 v.mTop += offset; 4236 v.mBottom += offset; 4237 if (v.mDisplayList != null) { 4238 v.mDisplayList.offsetTopBottom(offset); 4239 invalidateViewProperty(false, false); 4240 } 4241 } 4242 } 4243 4244 /** 4245 * {@inheritDoc} 4246 */ 4247 public boolean getChildVisibleRect(View child, Rect r, android.graphics.Point offset) { 4248 // It doesn't make a whole lot of sense to call this on a view that isn't attached, 4249 // but for some simple tests it can be useful. If we don't have attach info this 4250 // will allocate memory. 4251 final RectF rect = mAttachInfo != null ? mAttachInfo.mTmpTransformRect : new RectF(); 4252 rect.set(r); 4253 4254 if (!child.hasIdentityMatrix()) { 4255 child.getMatrix().mapRect(rect); 4256 } 4257 4258 int dx = child.mLeft - mScrollX; 4259 int dy = child.mTop - mScrollY; 4260 4261 rect.offset(dx, dy); 4262 4263 if (offset != null) { 4264 if (!child.hasIdentityMatrix()) { 4265 float[] position = mAttachInfo != null ? mAttachInfo.mTmpTransformLocation 4266 : new float[2]; 4267 position[0] = offset.x; 4268 position[1] = offset.y; 4269 child.getMatrix().mapPoints(position); 4270 offset.x = (int) (position[0] + 0.5f); 4271 offset.y = (int) (position[1] + 0.5f); 4272 } 4273 offset.x += dx; 4274 offset.y += dy; 4275 } 4276 4277 if (rect.intersect(0, 0, mRight - mLeft, mBottom - mTop)) { 4278 if (mParent == null) return true; 4279 r.set((int) (rect.left + 0.5f), (int) (rect.top + 0.5f), 4280 (int) (rect.right + 0.5f), (int) (rect.bottom + 0.5f)); 4281 return mParent.getChildVisibleRect(this, r, offset); 4282 } 4283 4284 return false; 4285 } 4286 4287 /** 4288 * {@inheritDoc} 4289 */ 4290 @Override 4291 public final void layout(int l, int t, int r, int b) { 4292 if (mTransition == null || !mTransition.isChangingLayout()) { 4293 if (mTransition != null) { 4294 mTransition.layoutChange(this); 4295 } 4296 super.layout(l, t, r, b); 4297 } else { 4298 // record the fact that we noop'd it; request layout when transition finishes 4299 mLayoutSuppressed = true; 4300 } 4301 } 4302 4303 /** 4304 * {@inheritDoc} 4305 */ 4306 @Override 4307 protected abstract void onLayout(boolean changed, 4308 int l, int t, int r, int b); 4309 4310 /** 4311 * Indicates whether the view group has the ability to animate its children 4312 * after the first layout. 4313 * 4314 * @return true if the children can be animated, false otherwise 4315 */ 4316 protected boolean canAnimate() { 4317 return mLayoutAnimationController != null; 4318 } 4319 4320 /** 4321 * Runs the layout animation. Calling this method triggers a relayout of 4322 * this view group. 4323 */ 4324 public void startLayoutAnimation() { 4325 if (mLayoutAnimationController != null) { 4326 mGroupFlags |= FLAG_RUN_ANIMATION; 4327 requestLayout(); 4328 } 4329 } 4330 4331 /** 4332 * Schedules the layout animation to be played after the next layout pass 4333 * of this view group. This can be used to restart the layout animation 4334 * when the content of the view group changes or when the activity is 4335 * paused and resumed. 4336 */ 4337 public void scheduleLayoutAnimation() { 4338 mGroupFlags |= FLAG_RUN_ANIMATION; 4339 } 4340 4341 /** 4342 * Sets the layout animation controller used to animate the group's 4343 * children after the first layout. 4344 * 4345 * @param controller the animation controller 4346 */ 4347 public void setLayoutAnimation(LayoutAnimationController controller) { 4348 mLayoutAnimationController = controller; 4349 if (mLayoutAnimationController != null) { 4350 mGroupFlags |= FLAG_RUN_ANIMATION; 4351 } 4352 } 4353 4354 /** 4355 * Returns the layout animation controller used to animate the group's 4356 * children. 4357 * 4358 * @return the current animation controller 4359 */ 4360 public LayoutAnimationController getLayoutAnimation() { 4361 return mLayoutAnimationController; 4362 } 4363 4364 /** 4365 * Indicates whether the children's drawing cache is used during a layout 4366 * animation. By default, the drawing cache is enabled but this will prevent 4367 * nested layout animations from working. To nest animations, you must disable 4368 * the cache. 4369 * 4370 * @return true if the animation cache is enabled, false otherwise 4371 * 4372 * @see #setAnimationCacheEnabled(boolean) 4373 * @see View#setDrawingCacheEnabled(boolean) 4374 */ 4375 @ViewDebug.ExportedProperty 4376 public boolean isAnimationCacheEnabled() { 4377 return (mGroupFlags & FLAG_ANIMATION_CACHE) == FLAG_ANIMATION_CACHE; 4378 } 4379 4380 /** 4381 * Enables or disables the children's drawing cache during a layout animation. 4382 * By default, the drawing cache is enabled but this will prevent nested 4383 * layout animations from working. To nest animations, you must disable the 4384 * cache. 4385 * 4386 * @param enabled true to enable the animation cache, false otherwise 4387 * 4388 * @see #isAnimationCacheEnabled() 4389 * @see View#setDrawingCacheEnabled(boolean) 4390 */ 4391 public void setAnimationCacheEnabled(boolean enabled) { 4392 setBooleanFlag(FLAG_ANIMATION_CACHE, enabled); 4393 } 4394 4395 /** 4396 * Indicates whether this ViewGroup will always try to draw its children using their 4397 * drawing cache. By default this property is enabled. 4398 * 4399 * @return true if the animation cache is enabled, false otherwise 4400 * 4401 * @see #setAlwaysDrawnWithCacheEnabled(boolean) 4402 * @see #setChildrenDrawnWithCacheEnabled(boolean) 4403 * @see View#setDrawingCacheEnabled(boolean) 4404 */ 4405 @ViewDebug.ExportedProperty(category = "drawing") 4406 public boolean isAlwaysDrawnWithCacheEnabled() { 4407 return (mGroupFlags & FLAG_ALWAYS_DRAWN_WITH_CACHE) == FLAG_ALWAYS_DRAWN_WITH_CACHE; 4408 } 4409 4410 /** 4411 * Indicates whether this ViewGroup will always try to draw its children using their 4412 * drawing cache. This property can be set to true when the cache rendering is 4413 * slightly different from the children's normal rendering. Renderings can be different, 4414 * for instance, when the cache's quality is set to low. 4415 * 4416 * When this property is disabled, the ViewGroup will use the drawing cache of its 4417 * children only when asked to. It's usually the task of subclasses to tell ViewGroup 4418 * when to start using the drawing cache and when to stop using it. 4419 * 4420 * @param always true to always draw with the drawing cache, false otherwise 4421 * 4422 * @see #isAlwaysDrawnWithCacheEnabled() 4423 * @see #setChildrenDrawnWithCacheEnabled(boolean) 4424 * @see View#setDrawingCacheEnabled(boolean) 4425 * @see View#setDrawingCacheQuality(int) 4426 */ 4427 public void setAlwaysDrawnWithCacheEnabled(boolean always) { 4428 setBooleanFlag(FLAG_ALWAYS_DRAWN_WITH_CACHE, always); 4429 } 4430 4431 /** 4432 * Indicates whether the ViewGroup is currently drawing its children using 4433 * their drawing cache. 4434 * 4435 * @return true if children should be drawn with their cache, false otherwise 4436 * 4437 * @see #setAlwaysDrawnWithCacheEnabled(boolean) 4438 * @see #setChildrenDrawnWithCacheEnabled(boolean) 4439 */ 4440 @ViewDebug.ExportedProperty(category = "drawing") 4441 protected boolean isChildrenDrawnWithCacheEnabled() { 4442 return (mGroupFlags & FLAG_CHILDREN_DRAWN_WITH_CACHE) == FLAG_CHILDREN_DRAWN_WITH_CACHE; 4443 } 4444 4445 /** 4446 * Tells the ViewGroup to draw its children using their drawing cache. This property 4447 * is ignored when {@link #isAlwaysDrawnWithCacheEnabled()} is true. A child's drawing cache 4448 * will be used only if it has been enabled. 4449 * 4450 * Subclasses should call this method to start and stop using the drawing cache when 4451 * they perform performance sensitive operations, like scrolling or animating. 4452 * 4453 * @param enabled true if children should be drawn with their cache, false otherwise 4454 * 4455 * @see #setAlwaysDrawnWithCacheEnabled(boolean) 4456 * @see #isChildrenDrawnWithCacheEnabled() 4457 */ 4458 protected void setChildrenDrawnWithCacheEnabled(boolean enabled) { 4459 setBooleanFlag(FLAG_CHILDREN_DRAWN_WITH_CACHE, enabled); 4460 } 4461 4462 /** 4463 * Indicates whether the ViewGroup is drawing its children in the order defined by 4464 * {@link #getChildDrawingOrder(int, int)}. 4465 * 4466 * @return true if children drawing order is defined by {@link #getChildDrawingOrder(int, int)}, 4467 * false otherwise 4468 * 4469 * @see #setChildrenDrawingOrderEnabled(boolean) 4470 * @see #getChildDrawingOrder(int, int) 4471 */ 4472 @ViewDebug.ExportedProperty(category = "drawing") 4473 protected boolean isChildrenDrawingOrderEnabled() { 4474 return (mGroupFlags & FLAG_USE_CHILD_DRAWING_ORDER) == FLAG_USE_CHILD_DRAWING_ORDER; 4475 } 4476 4477 /** 4478 * Tells the ViewGroup whether to draw its children in the order defined by the method 4479 * {@link #getChildDrawingOrder(int, int)}. 4480 * 4481 * @param enabled true if the order of the children when drawing is determined by 4482 * {@link #getChildDrawingOrder(int, int)}, false otherwise 4483 * 4484 * @see #isChildrenDrawingOrderEnabled() 4485 * @see #getChildDrawingOrder(int, int) 4486 */ 4487 protected void setChildrenDrawingOrderEnabled(boolean enabled) { 4488 setBooleanFlag(FLAG_USE_CHILD_DRAWING_ORDER, enabled); 4489 } 4490 4491 private void setBooleanFlag(int flag, boolean value) { 4492 if (value) { 4493 mGroupFlags |= flag; 4494 } else { 4495 mGroupFlags &= ~flag; 4496 } 4497 } 4498 4499 /** 4500 * Returns an integer indicating what types of drawing caches are kept in memory. 4501 * 4502 * @see #setPersistentDrawingCache(int) 4503 * @see #setAnimationCacheEnabled(boolean) 4504 * 4505 * @return one or a combination of {@link #PERSISTENT_NO_CACHE}, 4506 * {@link #PERSISTENT_ANIMATION_CACHE}, {@link #PERSISTENT_SCROLLING_CACHE} 4507 * and {@link #PERSISTENT_ALL_CACHES} 4508 */ 4509 @ViewDebug.ExportedProperty(category = "drawing", mapping = { 4510 @ViewDebug.IntToString(from = PERSISTENT_NO_CACHE, to = "NONE"), 4511 @ViewDebug.IntToString(from = PERSISTENT_ANIMATION_CACHE, to = "ANIMATION"), 4512 @ViewDebug.IntToString(from = PERSISTENT_SCROLLING_CACHE, to = "SCROLLING"), 4513 @ViewDebug.IntToString(from = PERSISTENT_ALL_CACHES, to = "ALL") 4514 }) 4515 public int getPersistentDrawingCache() { 4516 return mPersistentDrawingCache; 4517 } 4518 4519 /** 4520 * Indicates what types of drawing caches should be kept in memory after 4521 * they have been created. 4522 * 4523 * @see #getPersistentDrawingCache() 4524 * @see #setAnimationCacheEnabled(boolean) 4525 * 4526 * @param drawingCacheToKeep one or a combination of {@link #PERSISTENT_NO_CACHE}, 4527 * {@link #PERSISTENT_ANIMATION_CACHE}, {@link #PERSISTENT_SCROLLING_CACHE} 4528 * and {@link #PERSISTENT_ALL_CACHES} 4529 */ 4530 public void setPersistentDrawingCache(int drawingCacheToKeep) { 4531 mPersistentDrawingCache = drawingCacheToKeep & PERSISTENT_ALL_CACHES; 4532 } 4533 4534 /** 4535 * Returns the basis of alignment during the layout of this view group: 4536 * either {@link #COMPONENT_BOUNDS} or {@link #LAYOUT_BOUNDS}. 4537 * 4538 * @return the layout mode to use during layout operations 4539 * 4540 * @see #setLayoutMode(int) 4541 */ 4542 public int getLayoutMode() { 4543 if (mLayoutMode == UNDEFINED_LAYOUT_MODE) { 4544 ViewParent parent = getParent(); 4545 if (parent instanceof ViewGroup) { 4546 ViewGroup viewGroup = (ViewGroup) parent; 4547 return viewGroup.getLayoutMode(); 4548 } else { 4549 int targetSdkVersion = mContext.getApplicationInfo().targetSdkVersion; 4550 boolean preJellyBean = targetSdkVersion < Build.VERSION_CODES.JELLY_BEAN; 4551 return preJellyBean ? COMPONENT_BOUNDS : LAYOUT_BOUNDS; 4552 } 4553 4554 } 4555 return mLayoutMode; 4556 } 4557 4558 /** 4559 * Sets the basis of alignment during alignment of this view group. 4560 * Valid values are either {@link #COMPONENT_BOUNDS} or {@link #LAYOUT_BOUNDS}. 4561 * <p> 4562 * The default is to query the property of the parent if this view group has a parent. 4563 * If this ViewGroup is the root of the view hierarchy the default 4564 * value is {@link #LAYOUT_BOUNDS} for target SDK's greater than JellyBean, 4565 * {@link #LAYOUT_BOUNDS} otherwise. 4566 * 4567 * @param layoutMode the layout mode to use during layout operations 4568 * 4569 * @see #getLayoutMode() 4570 */ 4571 public void setLayoutMode(int layoutMode) { 4572 if (mLayoutMode != layoutMode) { 4573 mLayoutMode = layoutMode; 4574 requestLayout(); 4575 } 4576 } 4577 4578 /** 4579 * Returns a new set of layout parameters based on the supplied attributes set. 4580 * 4581 * @param attrs the attributes to build the layout parameters from 4582 * 4583 * @return an instance of {@link android.view.ViewGroup.LayoutParams} or one 4584 * of its descendants 4585 */ 4586 public LayoutParams generateLayoutParams(AttributeSet attrs) { 4587 return new LayoutParams(getContext(), attrs); 4588 } 4589 4590 /** 4591 * Returns a safe set of layout parameters based on the supplied layout params. 4592 * When a ViewGroup is passed a View whose layout params do not pass the test of 4593 * {@link #checkLayoutParams(android.view.ViewGroup.LayoutParams)}, this method 4594 * is invoked. This method should return a new set of layout params suitable for 4595 * this ViewGroup, possibly by copying the appropriate attributes from the 4596 * specified set of layout params. 4597 * 4598 * @param p The layout parameters to convert into a suitable set of layout parameters 4599 * for this ViewGroup. 4600 * 4601 * @return an instance of {@link android.view.ViewGroup.LayoutParams} or one 4602 * of its descendants 4603 */ 4604 protected LayoutParams generateLayoutParams(ViewGroup.LayoutParams p) { 4605 return p; 4606 } 4607 4608 /** 4609 * Returns a set of default layout parameters. These parameters are requested 4610 * when the View passed to {@link #addView(View)} has no layout parameters 4611 * already set. If null is returned, an exception is thrown from addView. 4612 * 4613 * @return a set of default layout parameters or null 4614 */ 4615 protected LayoutParams generateDefaultLayoutParams() { 4616 return new LayoutParams(LayoutParams.WRAP_CONTENT, LayoutParams.WRAP_CONTENT); 4617 } 4618 4619 /** 4620 * @hide 4621 */ 4622 @Override 4623 protected boolean dispatchConsistencyCheck(int consistency) { 4624 boolean result = super.dispatchConsistencyCheck(consistency); 4625 4626 final int count = mChildrenCount; 4627 final View[] children = mChildren; 4628 for (int i = 0; i < count; i++) { 4629 if (!children[i].dispatchConsistencyCheck(consistency)) result = false; 4630 } 4631 4632 return result; 4633 } 4634 4635 /** 4636 * @hide 4637 */ 4638 @Override 4639 protected boolean onConsistencyCheck(int consistency) { 4640 boolean result = super.onConsistencyCheck(consistency); 4641 4642 final boolean checkLayout = (consistency & ViewDebug.CONSISTENCY_LAYOUT) != 0; 4643 final boolean checkDrawing = (consistency & ViewDebug.CONSISTENCY_DRAWING) != 0; 4644 4645 if (checkLayout) { 4646 final int count = mChildrenCount; 4647 final View[] children = mChildren; 4648 for (int i = 0; i < count; i++) { 4649 if (children[i].getParent() != this) { 4650 result = false; 4651 android.util.Log.d(ViewDebug.CONSISTENCY_LOG_TAG, 4652 "View " + children[i] + " has no parent/a parent that is not " + this); 4653 } 4654 } 4655 } 4656 4657 if (checkDrawing) { 4658 // If this group is dirty, check that the parent is dirty as well 4659 if ((mPrivateFlags & DIRTY_MASK) != 0) { 4660 final ViewParent parent = getParent(); 4661 if (parent != null && !(parent instanceof ViewRootImpl)) { 4662 if ((((View) parent).mPrivateFlags & DIRTY_MASK) == 0) { 4663 result = false; 4664 android.util.Log.d(ViewDebug.CONSISTENCY_LOG_TAG, 4665 "ViewGroup " + this + " is dirty but its parent is not: " + this); 4666 } 4667 } 4668 } 4669 } 4670 4671 return result; 4672 } 4673 4674 /** 4675 * {@inheritDoc} 4676 */ 4677 @Override 4678 protected void debug(int depth) { 4679 super.debug(depth); 4680 String output; 4681 4682 if (mFocused != null) { 4683 output = debugIndent(depth); 4684 output += "mFocused"; 4685 Log.d(VIEW_LOG_TAG, output); 4686 } 4687 if (mChildrenCount != 0) { 4688 output = debugIndent(depth); 4689 output += "{"; 4690 Log.d(VIEW_LOG_TAG, output); 4691 } 4692 int count = mChildrenCount; 4693 for (int i = 0; i < count; i++) { 4694 View child = mChildren[i]; 4695 child.debug(depth + 1); 4696 } 4697 4698 if (mChildrenCount != 0) { 4699 output = debugIndent(depth); 4700 output += "}"; 4701 Log.d(VIEW_LOG_TAG, output); 4702 } 4703 } 4704 4705 /** 4706 * Returns the position in the group of the specified child view. 4707 * 4708 * @param child the view for which to get the position 4709 * @return a positive integer representing the position of the view in the 4710 * group, or -1 if the view does not exist in the group 4711 */ 4712 public int indexOfChild(View child) { 4713 final int count = mChildrenCount; 4714 final View[] children = mChildren; 4715 for (int i = 0; i < count; i++) { 4716 if (children[i] == child) { 4717 return i; 4718 } 4719 } 4720 return -1; 4721 } 4722 4723 /** 4724 * Returns the number of children in the group. 4725 * 4726 * @return a positive integer representing the number of children in 4727 * the group 4728 */ 4729 public int getChildCount() { 4730 return mChildrenCount; 4731 } 4732 4733 /** 4734 * Returns the view at the specified position in the group. 4735 * 4736 * @param index the position at which to get the view from 4737 * @return the view at the specified position or null if the position 4738 * does not exist within the group 4739 */ 4740 public View getChildAt(int index) { 4741 if (index < 0 || index >= mChildrenCount) { 4742 return null; 4743 } 4744 return mChildren[index]; 4745 } 4746 4747 /** 4748 * Ask all of the children of this view to measure themselves, taking into 4749 * account both the MeasureSpec requirements for this view and its padding. 4750 * We skip children that are in the GONE state The heavy lifting is done in 4751 * getChildMeasureSpec. 4752 * 4753 * @param widthMeasureSpec The width requirements for this view 4754 * @param heightMeasureSpec The height requirements for this view 4755 */ 4756 protected void measureChildren(int widthMeasureSpec, int heightMeasureSpec) { 4757 final int size = mChildrenCount; 4758 final View[] children = mChildren; 4759 for (int i = 0; i < size; ++i) { 4760 final View child = children[i]; 4761 if ((child.mViewFlags & VISIBILITY_MASK) != GONE) { 4762 measureChild(child, widthMeasureSpec, heightMeasureSpec); 4763 } 4764 } 4765 } 4766 4767 /** 4768 * Ask one of the children of this view to measure itself, taking into 4769 * account both the MeasureSpec requirements for this view and its padding. 4770 * The heavy lifting is done in getChildMeasureSpec. 4771 * 4772 * @param child The child to measure 4773 * @param parentWidthMeasureSpec The width requirements for this view 4774 * @param parentHeightMeasureSpec The height requirements for this view 4775 */ 4776 protected void measureChild(View child, int parentWidthMeasureSpec, 4777 int parentHeightMeasureSpec) { 4778 final LayoutParams lp = child.getLayoutParams(); 4779 4780 final int childWidthMeasureSpec = getChildMeasureSpec(parentWidthMeasureSpec, 4781 mPaddingLeft + mPaddingRight, lp.width); 4782 final int childHeightMeasureSpec = getChildMeasureSpec(parentHeightMeasureSpec, 4783 mPaddingTop + mPaddingBottom, lp.height); 4784 4785 child.measure(childWidthMeasureSpec, childHeightMeasureSpec); 4786 } 4787 4788 /** 4789 * Ask one of the children of this view to measure itself, taking into 4790 * account both the MeasureSpec requirements for this view and its padding 4791 * and margins. The child must have MarginLayoutParams The heavy lifting is 4792 * done in getChildMeasureSpec. 4793 * 4794 * @param child The child to measure 4795 * @param parentWidthMeasureSpec The width requirements for this view 4796 * @param widthUsed Extra space that has been used up by the parent 4797 * horizontally (possibly by other children of the parent) 4798 * @param parentHeightMeasureSpec The height requirements for this view 4799 * @param heightUsed Extra space that has been used up by the parent 4800 * vertically (possibly by other children of the parent) 4801 */ 4802 protected void measureChildWithMargins(View child, 4803 int parentWidthMeasureSpec, int widthUsed, 4804 int parentHeightMeasureSpec, int heightUsed) { 4805 final MarginLayoutParams lp = (MarginLayoutParams) child.getLayoutParams(); 4806 4807 final int childWidthMeasureSpec = getChildMeasureSpec(parentWidthMeasureSpec, 4808 mPaddingLeft + mPaddingRight + lp.leftMargin + lp.rightMargin 4809 + widthUsed, lp.width); 4810 final int childHeightMeasureSpec = getChildMeasureSpec(parentHeightMeasureSpec, 4811 mPaddingTop + mPaddingBottom + lp.topMargin + lp.bottomMargin 4812 + heightUsed, lp.height); 4813 4814 child.measure(childWidthMeasureSpec, childHeightMeasureSpec); 4815 } 4816 4817 /** 4818 * Does the hard part of measureChildren: figuring out the MeasureSpec to 4819 * pass to a particular child. This method figures out the right MeasureSpec 4820 * for one dimension (height or width) of one child view. 4821 * 4822 * The goal is to combine information from our MeasureSpec with the 4823 * LayoutParams of the child to get the best possible results. For example, 4824 * if the this view knows its size (because its MeasureSpec has a mode of 4825 * EXACTLY), and the child has indicated in its LayoutParams that it wants 4826 * to be the same size as the parent, the parent should ask the child to 4827 * layout given an exact size. 4828 * 4829 * @param spec The requirements for this view 4830 * @param padding The padding of this view for the current dimension and 4831 * margins, if applicable 4832 * @param childDimension How big the child wants to be in the current 4833 * dimension 4834 * @return a MeasureSpec integer for the child 4835 */ 4836 public static int getChildMeasureSpec(int spec, int padding, int childDimension) { 4837 int specMode = MeasureSpec.getMode(spec); 4838 int specSize = MeasureSpec.getSize(spec); 4839 4840 int size = Math.max(0, specSize - padding); 4841 4842 int resultSize = 0; 4843 int resultMode = 0; 4844 4845 switch (specMode) { 4846 // Parent has imposed an exact size on us 4847 case MeasureSpec.EXACTLY: 4848 if (childDimension >= 0) { 4849 resultSize = childDimension; 4850 resultMode = MeasureSpec.EXACTLY; 4851 } else if (childDimension == LayoutParams.MATCH_PARENT) { 4852 // Child wants to be our size. So be it. 4853 resultSize = size; 4854 resultMode = MeasureSpec.EXACTLY; 4855 } else if (childDimension == LayoutParams.WRAP_CONTENT) { 4856 // Child wants to determine its own size. It can't be 4857 // bigger than us. 4858 resultSize = size; 4859 resultMode = MeasureSpec.AT_MOST; 4860 } 4861 break; 4862 4863 // Parent has imposed a maximum size on us 4864 case MeasureSpec.AT_MOST: 4865 if (childDimension >= 0) { 4866 // Child wants a specific size... so be it 4867 resultSize = childDimension; 4868 resultMode = MeasureSpec.EXACTLY; 4869 } else if (childDimension == LayoutParams.MATCH_PARENT) { 4870 // Child wants to be our size, but our size is not fixed. 4871 // Constrain child to not be bigger than us. 4872 resultSize = size; 4873 resultMode = MeasureSpec.AT_MOST; 4874 } else if (childDimension == LayoutParams.WRAP_CONTENT) { 4875 // Child wants to determine its own size. It can't be 4876 // bigger than us. 4877 resultSize = size; 4878 resultMode = MeasureSpec.AT_MOST; 4879 } 4880 break; 4881 4882 // Parent asked to see how big we want to be 4883 case MeasureSpec.UNSPECIFIED: 4884 if (childDimension >= 0) { 4885 // Child wants a specific size... let him have it 4886 resultSize = childDimension; 4887 resultMode = MeasureSpec.EXACTLY; 4888 } else if (childDimension == LayoutParams.MATCH_PARENT) { 4889 // Child wants to be our size... find out how big it should 4890 // be 4891 resultSize = 0; 4892 resultMode = MeasureSpec.UNSPECIFIED; 4893 } else if (childDimension == LayoutParams.WRAP_CONTENT) { 4894 // Child wants to determine its own size.... find out how 4895 // big it should be 4896 resultSize = 0; 4897 resultMode = MeasureSpec.UNSPECIFIED; 4898 } 4899 break; 4900 } 4901 return MeasureSpec.makeMeasureSpec(resultSize, resultMode); 4902 } 4903 4904 4905 /** 4906 * Removes any pending animations for views that have been removed. Call 4907 * this if you don't want animations for exiting views to stack up. 4908 */ 4909 public void clearDisappearingChildren() { 4910 if (mDisappearingChildren != null) { 4911 mDisappearingChildren.clear(); 4912 invalidate(); 4913 } 4914 } 4915 4916 /** 4917 * Add a view which is removed from mChildren but still needs animation 4918 * 4919 * @param v View to add 4920 */ 4921 private void addDisappearingView(View v) { 4922 ArrayList<View> disappearingChildren = mDisappearingChildren; 4923 4924 if (disappearingChildren == null) { 4925 disappearingChildren = mDisappearingChildren = new ArrayList<View>(); 4926 } 4927 4928 disappearingChildren.add(v); 4929 } 4930 4931 /** 4932 * Cleanup a view when its animation is done. This may mean removing it from 4933 * the list of disappearing views. 4934 * 4935 * @param view The view whose animation has finished 4936 * @param animation The animation, cannot be null 4937 */ 4938 void finishAnimatingView(final View view, Animation animation) { 4939 final ArrayList<View> disappearingChildren = mDisappearingChildren; 4940 if (disappearingChildren != null) { 4941 if (disappearingChildren.contains(view)) { 4942 disappearingChildren.remove(view); 4943 4944 if (view.mAttachInfo != null) { 4945 view.dispatchDetachedFromWindow(); 4946 } 4947 4948 view.clearAnimation(); 4949 mGroupFlags |= FLAG_INVALIDATE_REQUIRED; 4950 } 4951 } 4952 4953 if (animation != null && !animation.getFillAfter()) { 4954 view.clearAnimation(); 4955 } 4956 4957 if ((view.mPrivateFlags & ANIMATION_STARTED) == ANIMATION_STARTED) { 4958 view.onAnimationEnd(); 4959 // Should be performed by onAnimationEnd() but this avoid an infinite loop, 4960 // so we'd rather be safe than sorry 4961 view.mPrivateFlags &= ~ANIMATION_STARTED; 4962 // Draw one more frame after the animation is done 4963 mGroupFlags |= FLAG_INVALIDATE_REQUIRED; 4964 } 4965 } 4966 4967 /** 4968 * Utility function called by View during invalidation to determine whether a view that 4969 * is invisible or gone should still be invalidated because it is being transitioned (and 4970 * therefore still needs to be drawn). 4971 */ 4972 boolean isViewTransitioning(View view) { 4973 return (mTransitioningViews != null && mTransitioningViews.contains(view)); 4974 } 4975 4976 /** 4977 * This method tells the ViewGroup that the given View object, which should have this 4978 * ViewGroup as its parent, 4979 * should be kept around (re-displayed when the ViewGroup draws its children) even if it 4980 * is removed from its parent. This allows animations, such as those used by 4981 * {@link android.app.Fragment} and {@link android.animation.LayoutTransition} to animate 4982 * the removal of views. A call to this method should always be accompanied by a later call 4983 * to {@link #endViewTransition(View)}, such as after an animation on the View has finished, 4984 * so that the View finally gets removed. 4985 * 4986 * @param view The View object to be kept visible even if it gets removed from its parent. 4987 */ 4988 public void startViewTransition(View view) { 4989 if (view.mParent == this) { 4990 if (mTransitioningViews == null) { 4991 mTransitioningViews = new ArrayList<View>(); 4992 } 4993 mTransitioningViews.add(view); 4994 } 4995 } 4996 4997 /** 4998 * This method should always be called following an earlier call to 4999 * {@link #startViewTransition(View)}. The given View is finally removed from its parent 5000 * and will no longer be displayed. Note that this method does not perform the functionality 5001 * of removing a view from its parent; it just discontinues the display of a View that 5002 * has previously been removed. 5003 * 5004 * @return view The View object that has been removed but is being kept around in the visible 5005 * hierarchy by an earlier call to {@link #startViewTransition(View)}. 5006 */ 5007 public void endViewTransition(View view) { 5008 if (mTransitioningViews != null) { 5009 mTransitioningViews.remove(view); 5010 final ArrayList<View> disappearingChildren = mDisappearingChildren; 5011 if (disappearingChildren != null && disappearingChildren.contains(view)) { 5012 disappearingChildren.remove(view); 5013 if (mVisibilityChangingChildren != null && 5014 mVisibilityChangingChildren.contains(view)) { 5015 mVisibilityChangingChildren.remove(view); 5016 } else { 5017 if (view.mAttachInfo != null) { 5018 view.dispatchDetachedFromWindow(); 5019 } 5020 if (view.mParent != null) { 5021 view.mParent = null; 5022 } 5023 } 5024 invalidate(); 5025 } 5026 } 5027 } 5028 5029 private LayoutTransition.TransitionListener mLayoutTransitionListener = 5030 new LayoutTransition.TransitionListener() { 5031 @Override 5032 public void startTransition(LayoutTransition transition, ViewGroup container, 5033 View view, int transitionType) { 5034 // We only care about disappearing items, since we need special logic to keep 5035 // those items visible after they've been 'removed' 5036 if (transitionType == LayoutTransition.DISAPPEARING) { 5037 startViewTransition(view); 5038 } 5039 } 5040 5041 @Override 5042 public void endTransition(LayoutTransition transition, ViewGroup container, 5043 View view, int transitionType) { 5044 if (mLayoutSuppressed && !transition.isChangingLayout()) { 5045 requestLayout(); 5046 mLayoutSuppressed = false; 5047 } 5048 if (transitionType == LayoutTransition.DISAPPEARING && mTransitioningViews != null) { 5049 endViewTransition(view); 5050 } 5051 } 5052 }; 5053 5054 /** 5055 * {@inheritDoc} 5056 */ 5057 @Override 5058 public boolean gatherTransparentRegion(Region region) { 5059 // If no transparent regions requested, we are always opaque. 5060 final boolean meOpaque = (mPrivateFlags & View.REQUEST_TRANSPARENT_REGIONS) == 0; 5061 if (meOpaque && region == null) { 5062 // The caller doesn't care about the region, so stop now. 5063 return true; 5064 } 5065 super.gatherTransparentRegion(region); 5066 final View[] children = mChildren; 5067 final int count = mChildrenCount; 5068 boolean noneOfTheChildrenAreTransparent = true; 5069 for (int i = 0; i < count; i++) { 5070 final View child = children[i]; 5071 if ((child.mViewFlags & VISIBILITY_MASK) == VISIBLE || child.getAnimation() != null) { 5072 if (!child.gatherTransparentRegion(region)) { 5073 noneOfTheChildrenAreTransparent = false; 5074 } 5075 } 5076 } 5077 return meOpaque || noneOfTheChildrenAreTransparent; 5078 } 5079 5080 /** 5081 * {@inheritDoc} 5082 */ 5083 public void requestTransparentRegion(View child) { 5084 if (child != null) { 5085 child.mPrivateFlags |= View.REQUEST_TRANSPARENT_REGIONS; 5086 if (mParent != null) { 5087 mParent.requestTransparentRegion(this); 5088 } 5089 } 5090 } 5091 5092 5093 @Override 5094 protected boolean fitSystemWindows(Rect insets) { 5095 boolean done = super.fitSystemWindows(insets); 5096 if (!done) { 5097 final int count = mChildrenCount; 5098 final View[] children = mChildren; 5099 for (int i = 0; i < count; i++) { 5100 done = children[i].fitSystemWindows(insets); 5101 if (done) { 5102 break; 5103 } 5104 } 5105 } 5106 return done; 5107 } 5108 5109 /** 5110 * Returns the animation listener to which layout animation events are 5111 * sent. 5112 * 5113 * @return an {@link android.view.animation.Animation.AnimationListener} 5114 */ 5115 public Animation.AnimationListener getLayoutAnimationListener() { 5116 return mAnimationListener; 5117 } 5118 5119 @Override 5120 protected void drawableStateChanged() { 5121 super.drawableStateChanged(); 5122 5123 if ((mGroupFlags & FLAG_NOTIFY_CHILDREN_ON_DRAWABLE_STATE_CHANGE) != 0) { 5124 if ((mGroupFlags & FLAG_ADD_STATES_FROM_CHILDREN) != 0) { 5125 throw new IllegalStateException("addStateFromChildren cannot be enabled if a" 5126 + " child has duplicateParentState set to true"); 5127 } 5128 5129 final View[] children = mChildren; 5130 final int count = mChildrenCount; 5131 5132 for (int i = 0; i < count; i++) { 5133 final View child = children[i]; 5134 if ((child.mViewFlags & DUPLICATE_PARENT_STATE) != 0) { 5135 child.refreshDrawableState(); 5136 } 5137 } 5138 } 5139 } 5140 5141 @Override 5142 public void jumpDrawablesToCurrentState() { 5143 super.jumpDrawablesToCurrentState(); 5144 final View[] children = mChildren; 5145 final int count = mChildrenCount; 5146 for (int i = 0; i < count; i++) { 5147 children[i].jumpDrawablesToCurrentState(); 5148 } 5149 } 5150 5151 @Override 5152 protected int[] onCreateDrawableState(int extraSpace) { 5153 if ((mGroupFlags & FLAG_ADD_STATES_FROM_CHILDREN) == 0) { 5154 return super.onCreateDrawableState(extraSpace); 5155 } 5156 5157 int need = 0; 5158 int n = getChildCount(); 5159 for (int i = 0; i < n; i++) { 5160 int[] childState = getChildAt(i).getDrawableState(); 5161 5162 if (childState != null) { 5163 need += childState.length; 5164 } 5165 } 5166 5167 int[] state = super.onCreateDrawableState(extraSpace + need); 5168 5169 for (int i = 0; i < n; i++) { 5170 int[] childState = getChildAt(i).getDrawableState(); 5171 5172 if (childState != null) { 5173 state = mergeDrawableStates(state, childState); 5174 } 5175 } 5176 5177 return state; 5178 } 5179 5180 /** 5181 * Sets whether this ViewGroup's drawable states also include 5182 * its children's drawable states. This is used, for example, to 5183 * make a group appear to be focused when its child EditText or button 5184 * is focused. 5185 */ 5186 public void setAddStatesFromChildren(boolean addsStates) { 5187 if (addsStates) { 5188 mGroupFlags |= FLAG_ADD_STATES_FROM_CHILDREN; 5189 } else { 5190 mGroupFlags &= ~FLAG_ADD_STATES_FROM_CHILDREN; 5191 } 5192 5193 refreshDrawableState(); 5194 } 5195 5196 /** 5197 * Returns whether this ViewGroup's drawable states also include 5198 * its children's drawable states. This is used, for example, to 5199 * make a group appear to be focused when its child EditText or button 5200 * is focused. 5201 */ 5202 public boolean addStatesFromChildren() { 5203 return (mGroupFlags & FLAG_ADD_STATES_FROM_CHILDREN) != 0; 5204 } 5205 5206 /** 5207 * If {link #addStatesFromChildren} is true, refreshes this group's 5208 * drawable state (to include the states from its children). 5209 */ 5210 public void childDrawableStateChanged(View child) { 5211 if ((mGroupFlags & FLAG_ADD_STATES_FROM_CHILDREN) != 0) { 5212 refreshDrawableState(); 5213 } 5214 } 5215 5216 /** 5217 * Specifies the animation listener to which layout animation events must 5218 * be sent. Only 5219 * {@link android.view.animation.Animation.AnimationListener#onAnimationStart(Animation)} 5220 * and 5221 * {@link android.view.animation.Animation.AnimationListener#onAnimationEnd(Animation)} 5222 * are invoked. 5223 * 5224 * @param animationListener the layout animation listener 5225 */ 5226 public void setLayoutAnimationListener(Animation.AnimationListener animationListener) { 5227 mAnimationListener = animationListener; 5228 } 5229 5230 /** 5231 * This method is called by LayoutTransition when there are 'changing' animations that need 5232 * to start after the layout/setup phase. The request is forwarded to the ViewAncestor, who 5233 * starts all pending transitions prior to the drawing phase in the current traversal. 5234 * 5235 * @param transition The LayoutTransition to be started on the next traversal. 5236 * 5237 * @hide 5238 */ 5239 public void requestTransitionStart(LayoutTransition transition) { 5240 ViewRootImpl viewAncestor = getViewRootImpl(); 5241 if (viewAncestor != null) { 5242 viewAncestor.requestTransitionStart(transition); 5243 } 5244 } 5245 5246 @Override 5247 public void onResolvedLayoutDirectionReset() { 5248 // Take care of resetting the children resolution too 5249 final int count = getChildCount(); 5250 for (int i = 0; i < count; i++) { 5251 final View child = getChildAt(i); 5252 if (child.getLayoutDirection() == LAYOUT_DIRECTION_INHERIT) { 5253 child.resetResolvedLayoutDirection(); 5254 } 5255 } 5256 } 5257 5258 @Override 5259 public void onResolvedTextDirectionReset() { 5260 // Take care of resetting the children resolution too 5261 final int count = getChildCount(); 5262 for (int i = 0; i < count; i++) { 5263 final View child = getChildAt(i); 5264 if (child.getTextDirection() == TEXT_DIRECTION_INHERIT) { 5265 child.resetResolvedTextDirection(); 5266 } 5267 } 5268 } 5269 5270 @Override 5271 public void onResolvedTextAlignmentReset() { 5272 // Take care of resetting the children resolution too 5273 final int count = getChildCount(); 5274 for (int i = 0; i < count; i++) { 5275 final View child = getChildAt(i); 5276 if (child.getTextAlignment() == TEXT_ALIGNMENT_INHERIT) { 5277 child.resetResolvedTextAlignment(); 5278 } 5279 } 5280 } 5281 5282 /** 5283 * Return true if the pressed state should be delayed for children or descendants of this 5284 * ViewGroup. Generally, this should be done for containers that can scroll, such as a List. 5285 * This prevents the pressed state from appearing when the user is actually trying to scroll 5286 * the content. 5287 * 5288 * The default implementation returns true for compatibility reasons. Subclasses that do 5289 * not scroll should generally override this method and return false. 5290 */ 5291 public boolean shouldDelayChildPressedState() { 5292 return true; 5293 } 5294 5295 /** @hide */ 5296 protected void onSetLayoutParams(View child, LayoutParams layoutParams) { 5297 } 5298 5299 /** 5300 * LayoutParams are used by views to tell their parents how they want to be 5301 * laid out. See 5302 * {@link android.R.styleable#ViewGroup_Layout ViewGroup Layout Attributes} 5303 * for a list of all child view attributes that this class supports. 5304 * 5305 * <p> 5306 * The base LayoutParams class just describes how big the view wants to be 5307 * for both width and height. For each dimension, it can specify one of: 5308 * <ul> 5309 * <li>FILL_PARENT (renamed MATCH_PARENT in API Level 8 and higher), which 5310 * means that the view wants to be as big as its parent (minus padding) 5311 * <li> WRAP_CONTENT, which means that the view wants to be just big enough 5312 * to enclose its content (plus padding) 5313 * <li> an exact number 5314 * </ul> 5315 * There are subclasses of LayoutParams for different subclasses of 5316 * ViewGroup. For example, AbsoluteLayout has its own subclass of 5317 * LayoutParams which adds an X and Y value.</p> 5318 * 5319 * <div class="special reference"> 5320 * <h3>Developer Guides</h3> 5321 * <p>For more information about creating user interface layouts, read the 5322 * <a href="{@docRoot}guide/topics/ui/declaring-layout.html">XML Layouts</a> developer 5323 * guide.</p></div> 5324 * 5325 * @attr ref android.R.styleable#ViewGroup_Layout_layout_height 5326 * @attr ref android.R.styleable#ViewGroup_Layout_layout_width 5327 */ 5328 public static class LayoutParams { 5329 /** 5330 * Special value for the height or width requested by a View. 5331 * FILL_PARENT means that the view wants to be as big as its parent, 5332 * minus the parent's padding, if any. This value is deprecated 5333 * starting in API Level 8 and replaced by {@link #MATCH_PARENT}. 5334 */ 5335 @SuppressWarnings({"UnusedDeclaration"}) 5336 @Deprecated 5337 public static final int FILL_PARENT = -1; 5338 5339 /** 5340 * Special value for the height or width requested by a View. 5341 * MATCH_PARENT means that the view wants to be as big as its parent, 5342 * minus the parent's padding, if any. Introduced in API Level 8. 5343 */ 5344 public static final int MATCH_PARENT = -1; 5345 5346 /** 5347 * Special value for the height or width requested by a View. 5348 * WRAP_CONTENT means that the view wants to be just large enough to fit 5349 * its own internal content, taking its own padding into account. 5350 */ 5351 public static final int WRAP_CONTENT = -2; 5352 5353 /** 5354 * Information about how wide the view wants to be. Can be one of the 5355 * constants FILL_PARENT (replaced by MATCH_PARENT , 5356 * in API Level 8) or WRAP_CONTENT. or an exact size. 5357 */ 5358 @ViewDebug.ExportedProperty(category = "layout", mapping = { 5359 @ViewDebug.IntToString(from = MATCH_PARENT, to = "MATCH_PARENT"), 5360 @ViewDebug.IntToString(from = WRAP_CONTENT, to = "WRAP_CONTENT") 5361 }) 5362 public int width; 5363 5364 /** 5365 * Information about how tall the view wants to be. Can be one of the 5366 * constants FILL_PARENT (replaced by MATCH_PARENT , 5367 * in API Level 8) or WRAP_CONTENT. or an exact size. 5368 */ 5369 @ViewDebug.ExportedProperty(category = "layout", mapping = { 5370 @ViewDebug.IntToString(from = MATCH_PARENT, to = "MATCH_PARENT"), 5371 @ViewDebug.IntToString(from = WRAP_CONTENT, to = "WRAP_CONTENT") 5372 }) 5373 public int height; 5374 5375 /** 5376 * Used to animate layouts. 5377 */ 5378 public LayoutAnimationController.AnimationParameters layoutAnimationParameters; 5379 5380 /** 5381 * Creates a new set of layout parameters. The values are extracted from 5382 * the supplied attributes set and context. The XML attributes mapped 5383 * to this set of layout parameters are: 5384 * 5385 * <ul> 5386 * <li><code>layout_width</code>: the width, either an exact value, 5387 * {@link #WRAP_CONTENT}, or {@link #FILL_PARENT} (replaced by 5388 * {@link #MATCH_PARENT} in API Level 8)</li> 5389 * <li><code>layout_height</code>: the height, either an exact value, 5390 * {@link #WRAP_CONTENT}, or {@link #FILL_PARENT} (replaced by 5391 * {@link #MATCH_PARENT} in API Level 8)</li> 5392 * </ul> 5393 * 5394 * @param c the application environment 5395 * @param attrs the set of attributes from which to extract the layout 5396 * parameters' values 5397 */ 5398 public LayoutParams(Context c, AttributeSet attrs) { 5399 TypedArray a = c.obtainStyledAttributes(attrs, R.styleable.ViewGroup_Layout); 5400 setBaseAttributes(a, 5401 R.styleable.ViewGroup_Layout_layout_width, 5402 R.styleable.ViewGroup_Layout_layout_height); 5403 a.recycle(); 5404 } 5405 5406 /** 5407 * Creates a new set of layout parameters with the specified width 5408 * and height. 5409 * 5410 * @param width the width, either {@link #WRAP_CONTENT}, 5411 * {@link #FILL_PARENT} (replaced by {@link #MATCH_PARENT} in 5412 * API Level 8), or a fixed size in pixels 5413 * @param height the height, either {@link #WRAP_CONTENT}, 5414 * {@link #FILL_PARENT} (replaced by {@link #MATCH_PARENT} in 5415 * API Level 8), or a fixed size in pixels 5416 */ 5417 public LayoutParams(int width, int height) { 5418 this.width = width; 5419 this.height = height; 5420 } 5421 5422 /** 5423 * Copy constructor. Clones the width and height values of the source. 5424 * 5425 * @param source The layout params to copy from. 5426 */ 5427 public LayoutParams(LayoutParams source) { 5428 this.width = source.width; 5429 this.height = source.height; 5430 } 5431 5432 /** 5433 * Used internally by MarginLayoutParams. 5434 * @hide 5435 */ 5436 LayoutParams() { 5437 } 5438 5439 /** 5440 * Extracts the layout parameters from the supplied attributes. 5441 * 5442 * @param a the style attributes to extract the parameters from 5443 * @param widthAttr the identifier of the width attribute 5444 * @param heightAttr the identifier of the height attribute 5445 */ 5446 protected void setBaseAttributes(TypedArray a, int widthAttr, int heightAttr) { 5447 width = a.getLayoutDimension(widthAttr, "layout_width"); 5448 height = a.getLayoutDimension(heightAttr, "layout_height"); 5449 } 5450 5451 /** 5452 * Resolve layout parameters depending on the layout direction. Subclasses that care about 5453 * layoutDirection changes should override this method. The default implementation does 5454 * nothing. 5455 * 5456 * @param layoutDirection the direction of the layout 5457 * 5458 * {@link View#LAYOUT_DIRECTION_LTR} 5459 * {@link View#LAYOUT_DIRECTION_RTL} 5460 */ 5461 public void onResolveLayoutDirection(int layoutDirection) { 5462 } 5463 5464 /** 5465 * Returns a String representation of this set of layout parameters. 5466 * 5467 * @param output the String to prepend to the internal representation 5468 * @return a String with the following format: output + 5469 * "ViewGroup.LayoutParams={ width=WIDTH, height=HEIGHT }" 5470 * 5471 * @hide 5472 */ 5473 public String debug(String output) { 5474 return output + "ViewGroup.LayoutParams={ width=" 5475 + sizeToString(width) + ", height=" + sizeToString(height) + " }"; 5476 } 5477 5478 /** 5479 * Converts the specified size to a readable String. 5480 * 5481 * @param size the size to convert 5482 * @return a String instance representing the supplied size 5483 * 5484 * @hide 5485 */ 5486 protected static String sizeToString(int size) { 5487 if (size == WRAP_CONTENT) { 5488 return "wrap-content"; 5489 } 5490 if (size == MATCH_PARENT) { 5491 return "match-parent"; 5492 } 5493 return String.valueOf(size); 5494 } 5495 } 5496 5497 /** 5498 * Per-child layout information for layouts that support margins. 5499 * See 5500 * {@link android.R.styleable#ViewGroup_MarginLayout ViewGroup Margin Layout Attributes} 5501 * for a list of all child view attributes that this class supports. 5502 */ 5503 public static class MarginLayoutParams extends ViewGroup.LayoutParams { 5504 /** 5505 * The left margin in pixels of the child. 5506 * Call {@link ViewGroup#setLayoutParams(LayoutParams)} after reassigning a new value 5507 * to this field. 5508 */ 5509 @ViewDebug.ExportedProperty(category = "layout") 5510 public int leftMargin; 5511 5512 /** 5513 * The top margin in pixels of the child. 5514 * Call {@link ViewGroup#setLayoutParams(LayoutParams)} after reassigning a new value 5515 * to this field. 5516 */ 5517 @ViewDebug.ExportedProperty(category = "layout") 5518 public int topMargin; 5519 5520 /** 5521 * The right margin in pixels of the child. 5522 * Call {@link ViewGroup#setLayoutParams(LayoutParams)} after reassigning a new value 5523 * to this field. 5524 */ 5525 @ViewDebug.ExportedProperty(category = "layout") 5526 public int rightMargin; 5527 5528 /** 5529 * The bottom margin in pixels of the child. 5530 * Call {@link ViewGroup#setLayoutParams(LayoutParams)} after reassigning a new value 5531 * to this field. 5532 */ 5533 @ViewDebug.ExportedProperty(category = "layout") 5534 public int bottomMargin; 5535 5536 /** 5537 * The start margin in pixels of the child. 5538 * Call {@link ViewGroup#setLayoutParams(LayoutParams)} after reassigning a new value 5539 * to this field. 5540 */ 5541 @ViewDebug.ExportedProperty(category = "layout") 5542 public int startMargin = DEFAULT_RELATIVE; 5543 5544 /** 5545 * The end margin in pixels of the child. 5546 * Call {@link ViewGroup#setLayoutParams(LayoutParams)} after reassigning a new value 5547 * to this field. 5548 */ 5549 @ViewDebug.ExportedProperty(category = "layout") 5550 public int endMargin = DEFAULT_RELATIVE; 5551 5552 /** 5553 * The default start and end margin. 5554 */ 5555 static private final int DEFAULT_RELATIVE = Integer.MIN_VALUE; 5556 5557 /** 5558 * Creates a new set of layout parameters. The values are extracted from 5559 * the supplied attributes set and context. 5560 * 5561 * @param c the application environment 5562 * @param attrs the set of attributes from which to extract the layout 5563 * parameters' values 5564 */ 5565 public MarginLayoutParams(Context c, AttributeSet attrs) { 5566 super(); 5567 5568 TypedArray a = c.obtainStyledAttributes(attrs, R.styleable.ViewGroup_MarginLayout); 5569 setBaseAttributes(a, 5570 R.styleable.ViewGroup_MarginLayout_layout_width, 5571 R.styleable.ViewGroup_MarginLayout_layout_height); 5572 5573 int margin = a.getDimensionPixelSize( 5574 com.android.internal.R.styleable.ViewGroup_MarginLayout_layout_margin, -1); 5575 if (margin >= 0) { 5576 leftMargin = margin; 5577 topMargin = margin; 5578 rightMargin= margin; 5579 bottomMargin = margin; 5580 } else { 5581 leftMargin = a.getDimensionPixelSize( 5582 R.styleable.ViewGroup_MarginLayout_layout_marginLeft, 0); 5583 topMargin = a.getDimensionPixelSize( 5584 R.styleable.ViewGroup_MarginLayout_layout_marginTop, 0); 5585 rightMargin = a.getDimensionPixelSize( 5586 R.styleable.ViewGroup_MarginLayout_layout_marginRight, 0); 5587 bottomMargin = a.getDimensionPixelSize( 5588 R.styleable.ViewGroup_MarginLayout_layout_marginBottom, 0); 5589 startMargin = a.getDimensionPixelSize( 5590 R.styleable.ViewGroup_MarginLayout_layout_marginStart, DEFAULT_RELATIVE); 5591 endMargin = a.getDimensionPixelSize( 5592 R.styleable.ViewGroup_MarginLayout_layout_marginEnd, DEFAULT_RELATIVE); 5593 } 5594 5595 a.recycle(); 5596 } 5597 5598 /** 5599 * {@inheritDoc} 5600 */ 5601 public MarginLayoutParams(int width, int height) { 5602 super(width, height); 5603 } 5604 5605 /** 5606 * Copy constructor. Clones the width, height and margin values of the source. 5607 * 5608 * @param source The layout params to copy from. 5609 */ 5610 public MarginLayoutParams(MarginLayoutParams source) { 5611 this.width = source.width; 5612 this.height = source.height; 5613 5614 this.leftMargin = source.leftMargin; 5615 this.topMargin = source.topMargin; 5616 this.rightMargin = source.rightMargin; 5617 this.bottomMargin = source.bottomMargin; 5618 this.startMargin = source.startMargin; 5619 this.endMargin = source.endMargin; 5620 } 5621 5622 /** 5623 * {@inheritDoc} 5624 */ 5625 public MarginLayoutParams(LayoutParams source) { 5626 super(source); 5627 } 5628 5629 /** 5630 * Sets the margins, in pixels. A call to {@link android.view.View#requestLayout()} needs 5631 * to be done so that the new margins are taken into account. Left and right margins may be 5632 * overriden by {@link android.view.View#requestLayout()} depending on layout direction. 5633 * 5634 * @param left the left margin size 5635 * @param top the top margin size 5636 * @param right the right margin size 5637 * @param bottom the bottom margin size 5638 * 5639 * @attr ref android.R.styleable#ViewGroup_MarginLayout_layout_marginLeft 5640 * @attr ref android.R.styleable#ViewGroup_MarginLayout_layout_marginTop 5641 * @attr ref android.R.styleable#ViewGroup_MarginLayout_layout_marginRight 5642 * @attr ref android.R.styleable#ViewGroup_MarginLayout_layout_marginBottom 5643 */ 5644 public void setMargins(int left, int top, int right, int bottom) { 5645 leftMargin = left; 5646 topMargin = top; 5647 rightMargin = right; 5648 bottomMargin = bottom; 5649 } 5650 5651 /** 5652 * Sets the relative margins, in pixels. A call to {@link android.view.View#requestLayout()} 5653 * needs to be done so that the new relative margins are taken into account. Left and right 5654 * margins may be overriden by {@link android.view.View#requestLayout()} depending on layout 5655 * direction. 5656 * 5657 * @param start the start margin size 5658 * @param top the top margin size 5659 * @param end the right margin size 5660 * @param bottom the bottom margin size 5661 * 5662 * @attr ref android.R.styleable#ViewGroup_MarginLayout_layout_marginStart 5663 * @attr ref android.R.styleable#ViewGroup_MarginLayout_layout_marginTop 5664 * @attr ref android.R.styleable#ViewGroup_MarginLayout_layout_marginEnd 5665 * @attr ref android.R.styleable#ViewGroup_MarginLayout_layout_marginBottom 5666 * 5667 * @hide 5668 */ 5669 public void setMarginsRelative(int start, int top, int end, int bottom) { 5670 startMargin = start; 5671 topMargin = top; 5672 endMargin = end; 5673 bottomMargin = bottom; 5674 } 5675 5676 /** 5677 * Returns the start margin in pixels. 5678 * 5679 * @attr ref android.R.styleable#ViewGroup_MarginLayout_layout_marginStart 5680 * 5681 * @return the start margin in pixels. 5682 */ 5683 public int getMarginStart() { 5684 return startMargin; 5685 } 5686 5687 /** 5688 * Returns the end margin in pixels. 5689 * 5690 * @attr ref android.R.styleable#ViewGroup_MarginLayout_layout_marginEnd 5691 * 5692 * @return the end margin in pixels. 5693 */ 5694 public int getMarginEnd() { 5695 return endMargin; 5696 } 5697 5698 /** 5699 * Check if margins are relative. 5700 * 5701 * @attr ref android.R.styleable#ViewGroup_MarginLayout_layout_marginStart 5702 * @attr ref android.R.styleable#ViewGroup_MarginLayout_layout_marginEnd 5703 * 5704 * @return true if either marginStart or marginEnd has been set 5705 */ 5706 public boolean isMarginRelative() { 5707 return (startMargin != DEFAULT_RELATIVE) || (endMargin != DEFAULT_RELATIVE); 5708 } 5709 5710 /** 5711 * This will be called by {@link android.view.View#requestLayout()}. Left and Right margins 5712 * may be overridden depending on layout direction. 5713 */ 5714 @Override 5715 public void onResolveLayoutDirection(int layoutDirection) { 5716 switch(layoutDirection) { 5717 case View.LAYOUT_DIRECTION_RTL: 5718 leftMargin = (endMargin > DEFAULT_RELATIVE) ? endMargin : leftMargin; 5719 rightMargin = (startMargin > DEFAULT_RELATIVE) ? startMargin : rightMargin; 5720 break; 5721 case View.LAYOUT_DIRECTION_LTR: 5722 default: 5723 leftMargin = (startMargin > DEFAULT_RELATIVE) ? startMargin : leftMargin; 5724 rightMargin = (endMargin > DEFAULT_RELATIVE) ? endMargin : rightMargin; 5725 break; 5726 } 5727 } 5728 } 5729 5730 /* Describes a touched view and the ids of the pointers that it has captured. 5731 * 5732 * This code assumes that pointer ids are always in the range 0..31 such that 5733 * it can use a bitfield to track which pointer ids are present. 5734 * As it happens, the lower layers of the input dispatch pipeline also use the 5735 * same trick so the assumption should be safe here... 5736 */ 5737 private static final class TouchTarget { 5738 private static final int MAX_RECYCLED = 32; 5739 private static final Object sRecycleLock = new Object(); 5740 private static TouchTarget sRecycleBin; 5741 private static int sRecycledCount; 5742 5743 public static final int ALL_POINTER_IDS = -1; // all ones 5744 5745 // The touched child view. 5746 public View child; 5747 5748 // The combined bit mask of pointer ids for all pointers captured by the target. 5749 public int pointerIdBits; 5750 5751 // The next target in the target list. 5752 public TouchTarget next; 5753 5754 private TouchTarget() { 5755 } 5756 5757 public static TouchTarget obtain(View child, int pointerIdBits) { 5758 final TouchTarget target; 5759 synchronized (sRecycleLock) { 5760 if (sRecycleBin == null) { 5761 target = new TouchTarget(); 5762 } else { 5763 target = sRecycleBin; 5764 sRecycleBin = target.next; 5765 sRecycledCount--; 5766 target.next = null; 5767 } 5768 } 5769 target.child = child; 5770 target.pointerIdBits = pointerIdBits; 5771 return target; 5772 } 5773 5774 public void recycle() { 5775 synchronized (sRecycleLock) { 5776 if (sRecycledCount < MAX_RECYCLED) { 5777 next = sRecycleBin; 5778 sRecycleBin = this; 5779 sRecycledCount += 1; 5780 } else { 5781 next = null; 5782 } 5783 child = null; 5784 } 5785 } 5786 } 5787 5788 /* Describes a hovered view. */ 5789 private static final class HoverTarget { 5790 private static final int MAX_RECYCLED = 32; 5791 private static final Object sRecycleLock = new Object(); 5792 private static HoverTarget sRecycleBin; 5793 private static int sRecycledCount; 5794 5795 // The hovered child view. 5796 public View child; 5797 5798 // The next target in the target list. 5799 public HoverTarget next; 5800 5801 private HoverTarget() { 5802 } 5803 5804 public static HoverTarget obtain(View child) { 5805 final HoverTarget target; 5806 synchronized (sRecycleLock) { 5807 if (sRecycleBin == null) { 5808 target = new HoverTarget(); 5809 } else { 5810 target = sRecycleBin; 5811 sRecycleBin = target.next; 5812 sRecycledCount--; 5813 target.next = null; 5814 } 5815 } 5816 target.child = child; 5817 return target; 5818 } 5819 5820 public void recycle() { 5821 synchronized (sRecycleLock) { 5822 if (sRecycledCount < MAX_RECYCLED) { 5823 next = sRecycleBin; 5824 sRecycleBin = this; 5825 sRecycledCount += 1; 5826 } else { 5827 next = null; 5828 } 5829 child = null; 5830 } 5831 } 5832 } 5833 5834 /** 5835 * Pooled class that orderes the children of a ViewGroup from start 5836 * to end based on how they are laid out and the layout direction. 5837 */ 5838 static class ChildListForAccessibility { 5839 5840 private static final int MAX_POOL_SIZE = 32; 5841 5842 private static final Object sPoolLock = new Object(); 5843 5844 private static ChildListForAccessibility sPool; 5845 5846 private static int sPoolSize; 5847 5848 private boolean mIsPooled; 5849 5850 private ChildListForAccessibility mNext; 5851 5852 private final ArrayList<View> mChildren = new ArrayList<View>(); 5853 5854 private final ArrayList<ViewLocationHolder> mHolders = new ArrayList<ViewLocationHolder>(); 5855 5856 public static ChildListForAccessibility obtain(ViewGroup parent, boolean sort) { 5857 ChildListForAccessibility list = null; 5858 synchronized (sPoolLock) { 5859 if (sPool != null) { 5860 list = sPool; 5861 sPool = list.mNext; 5862 list.mNext = null; 5863 list.mIsPooled = false; 5864 sPoolSize--; 5865 } else { 5866 list = new ChildListForAccessibility(); 5867 } 5868 list.init(parent, sort); 5869 return list; 5870 } 5871 } 5872 5873 public void recycle() { 5874 if (mIsPooled) { 5875 throw new IllegalStateException("Instance already recycled."); 5876 } 5877 clear(); 5878 synchronized (sPoolLock) { 5879 if (sPoolSize < MAX_POOL_SIZE) { 5880 mNext = sPool; 5881 mIsPooled = true; 5882 sPool = this; 5883 sPoolSize++; 5884 } 5885 } 5886 } 5887 5888 public int getChildCount() { 5889 return mChildren.size(); 5890 } 5891 5892 public View getChildAt(int index) { 5893 return mChildren.get(index); 5894 } 5895 5896 public int getChildIndex(View child) { 5897 return mChildren.indexOf(child); 5898 } 5899 5900 private void init(ViewGroup parent, boolean sort) { 5901 ArrayList<View> children = mChildren; 5902 final int childCount = parent.getChildCount(); 5903 for (int i = 0; i < childCount; i++) { 5904 View child = parent.getChildAt(i); 5905 children.add(child); 5906 } 5907 if (sort) { 5908 ArrayList<ViewLocationHolder> holders = mHolders; 5909 for (int i = 0; i < childCount; i++) { 5910 View child = children.get(i); 5911 ViewLocationHolder holder = ViewLocationHolder.obtain(parent, child); 5912 holders.add(holder); 5913 } 5914 Collections.sort(holders); 5915 for (int i = 0; i < childCount; i++) { 5916 ViewLocationHolder holder = holders.get(i); 5917 children.set(i, holder.mView); 5918 holder.recycle(); 5919 } 5920 holders.clear(); 5921 } 5922 } 5923 5924 private void clear() { 5925 mChildren.clear(); 5926 } 5927 } 5928 5929 /** 5930 * Pooled class that holds a View and its location with respect to 5931 * a specified root. This enables sorting of views based on their 5932 * coordinates without recomputing the position relative to the root 5933 * on every comparison. 5934 */ 5935 static class ViewLocationHolder implements Comparable<ViewLocationHolder> { 5936 5937 private static final int MAX_POOL_SIZE = 32; 5938 5939 private static final Object sPoolLock = new Object(); 5940 5941 private static ViewLocationHolder sPool; 5942 5943 private static int sPoolSize; 5944 5945 private boolean mIsPooled; 5946 5947 private ViewLocationHolder mNext; 5948 5949 private final Rect mLocation = new Rect(); 5950 5951 public View mView; 5952 5953 private int mLayoutDirection; 5954 5955 public static ViewLocationHolder obtain(ViewGroup root, View view) { 5956 ViewLocationHolder holder = null; 5957 synchronized (sPoolLock) { 5958 if (sPool != null) { 5959 holder = sPool; 5960 sPool = holder.mNext; 5961 holder.mNext = null; 5962 holder.mIsPooled = false; 5963 sPoolSize--; 5964 } else { 5965 holder = new ViewLocationHolder(); 5966 } 5967 holder.init(root, view); 5968 return holder; 5969 } 5970 } 5971 5972 public void recycle() { 5973 if (mIsPooled) { 5974 throw new IllegalStateException("Instance already recycled."); 5975 } 5976 clear(); 5977 synchronized (sPoolLock) { 5978 if (sPoolSize < MAX_POOL_SIZE) { 5979 mNext = sPool; 5980 mIsPooled = true; 5981 sPool = this; 5982 sPoolSize++; 5983 } 5984 } 5985 } 5986 5987 @Override 5988 public int compareTo(ViewLocationHolder another) { 5989 // This instance is greater than an invalid argument. 5990 if (another == null) { 5991 return 1; 5992 } 5993 if (getClass() != another.getClass()) { 5994 return 1; 5995 } 5996 // First is above second. 5997 if (mLocation.bottom - another.mLocation.top <= 0) { 5998 return -1; 5999 } 6000 // First is below second. 6001 if (mLocation.top - another.mLocation.bottom >= 0) { 6002 return 1; 6003 } 6004 // LTR 6005 if (mLayoutDirection == LAYOUT_DIRECTION_LTR) { 6006 final int leftDifference = mLocation.left - another.mLocation.left; 6007 // First more to the left than second. 6008 if (leftDifference != 0) { 6009 return leftDifference; 6010 } 6011 } else { // RTL 6012 final int rightDifference = mLocation.right - another.mLocation.right; 6013 // First more to the right than second. 6014 if (rightDifference != 0) { 6015 return -rightDifference; 6016 } 6017 } 6018 // Break tie by top. 6019 final int topDiference = mLocation.top - another.mLocation.top; 6020 if (topDiference != 0) { 6021 return topDiference; 6022 } 6023 // Break tie by height. 6024 final int heightDiference = mLocation.height() - another.mLocation.height(); 6025 if (heightDiference != 0) { 6026 return -heightDiference; 6027 } 6028 // Break tie by width. 6029 final int widthDiference = mLocation.width() - another.mLocation.width(); 6030 if (widthDiference != 0) { 6031 return -widthDiference; 6032 } 6033 // Just break the tie somehow. The accessibliity ids are unique 6034 // and stable, hence this is deterministic tie breaking. 6035 return mView.getAccessibilityViewId() - another.mView.getAccessibilityViewId(); 6036 } 6037 6038 private void init(ViewGroup root, View view) { 6039 Rect viewLocation = mLocation; 6040 view.getDrawingRect(viewLocation); 6041 root.offsetDescendantRectToMyCoords(view, viewLocation); 6042 mView = view; 6043 mLayoutDirection = root.getResolvedLayoutDirection(); 6044 } 6045 6046 private void clear() { 6047 mView = null; 6048 mLocation.set(0, 0, 0, 0); 6049 } 6050 } 6051} 6052