ViewGroup.java revision 10ca24a97cefc14fca1b26f59e627f487b3b108b
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.Color; 26import android.graphics.Insets; 27import android.graphics.Matrix; 28import android.graphics.Paint; 29import android.graphics.PointF; 30import android.graphics.Rect; 31import android.graphics.RectF; 32import android.graphics.Region; 33import android.os.Build; 34import android.os.Parcelable; 35import android.os.SystemClock; 36import android.util.AttributeSet; 37import android.util.Log; 38import android.util.SparseArray; 39import android.view.accessibility.AccessibilityEvent; 40import android.view.accessibility.AccessibilityNodeInfo; 41import android.view.animation.Animation; 42import android.view.animation.AnimationUtils; 43import android.view.animation.LayoutAnimationController; 44import android.view.animation.Transformation; 45 46import com.android.internal.R; 47import com.android.internal.util.Predicate; 48 49import java.util.ArrayList; 50import java.util.Collections; 51import java.util.HashSet; 52 53/** 54 * <p> 55 * A <code>ViewGroup</code> is a special view that can contain other views 56 * (called children.) The view group is the base class for layouts and views 57 * containers. This class also defines the 58 * {@link android.view.ViewGroup.LayoutParams} class which serves as the base 59 * class for layouts parameters. 60 * </p> 61 * 62 * <p> 63 * Also see {@link LayoutParams} for layout attributes. 64 * </p> 65 * 66 * <div class="special reference"> 67 * <h3>Developer Guides</h3> 68 * <p>For more information about creating user interface layouts, read the 69 * <a href="{@docRoot}guide/topics/ui/declaring-layout.html">XML Layouts</a> developer 70 * guide.</p></div> 71 * 72 * @attr ref android.R.styleable#ViewGroup_clipChildren 73 * @attr ref android.R.styleable#ViewGroup_clipToPadding 74 * @attr ref android.R.styleable#ViewGroup_layoutAnimation 75 * @attr ref android.R.styleable#ViewGroup_animationCache 76 * @attr ref android.R.styleable#ViewGroup_persistentDrawingCache 77 * @attr ref android.R.styleable#ViewGroup_alwaysDrawnWithCache 78 * @attr ref android.R.styleable#ViewGroup_addStatesFromChildren 79 * @attr ref android.R.styleable#ViewGroup_descendantFocusability 80 * @attr ref android.R.styleable#ViewGroup_animateLayoutChanges 81 */ 82public abstract class ViewGroup extends View implements ViewParent, ViewManager { 83 private static final String TAG = "ViewGroup"; 84 85 private static final boolean DBG = false; 86 87 /** 88 * Views which have been hidden or removed which need to be animated on 89 * their way out. 90 * This field should be made private, so it is hidden from the SDK. 91 * {@hide} 92 */ 93 protected ArrayList<View> mDisappearingChildren; 94 95 /** 96 * Listener used to propagate events indicating when children are added 97 * and/or removed from a view group. 98 * This field should be made private, so it is hidden from the SDK. 99 * {@hide} 100 */ 101 protected OnHierarchyChangeListener mOnHierarchyChangeListener; 102 103 // The view contained within this ViewGroup that has or contains focus. 104 private View mFocused; 105 106 /** 107 * A Transformation used when drawing children, to 108 * apply on the child being drawn. 109 */ 110 final Transformation mChildTransformation = new Transformation(); 111 112 /** 113 * Used to track the current invalidation region. 114 */ 115 RectF mInvalidateRegion; 116 117 /** 118 * A Transformation used to calculate a correct 119 * invalidation area when the application is autoscaled. 120 */ 121 Transformation mInvalidationTransformation; 122 123 // View currently under an ongoing drag 124 private View mCurrentDragView; 125 126 // Metadata about the ongoing drag 127 private DragEvent mCurrentDrag; 128 private HashSet<View> mDragNotifiedChildren; 129 130 // Does this group have a child that can accept the current drag payload? 131 private boolean mChildAcceptsDrag; 132 133 // Used during drag dispatch 134 private final PointF mLocalPoint = new PointF(); 135 136 // Layout animation 137 private LayoutAnimationController mLayoutAnimationController; 138 private Animation.AnimationListener mAnimationListener; 139 140 // First touch target in the linked list of touch targets. 141 private TouchTarget mFirstTouchTarget; 142 143 // For debugging only. You can see these in hierarchyviewer. 144 @SuppressWarnings({"FieldCanBeLocal", "UnusedDeclaration"}) 145 @ViewDebug.ExportedProperty(category = "events") 146 private long mLastTouchDownTime; 147 @ViewDebug.ExportedProperty(category = "events") 148 private int mLastTouchDownIndex = -1; 149 @SuppressWarnings({"FieldCanBeLocal", "UnusedDeclaration"}) 150 @ViewDebug.ExportedProperty(category = "events") 151 private float mLastTouchDownX; 152 @SuppressWarnings({"FieldCanBeLocal", "UnusedDeclaration"}) 153 @ViewDebug.ExportedProperty(category = "events") 154 private float mLastTouchDownY; 155 156 // First hover target in the linked list of hover targets. 157 // The hover targets are children which have received ACTION_HOVER_ENTER. 158 // They might not have actually handled the hover event, but we will 159 // continue sending hover events to them as long as the pointer remains over 160 // their bounds and the view group does not intercept hover. 161 private HoverTarget mFirstHoverTarget; 162 163 // True if the view group itself received a hover event. 164 // It might not have actually handled the hover event. 165 private boolean mHoveredSelf; 166 167 /** 168 * Internal flags. 169 * 170 * This field should be made private, so it is hidden from the SDK. 171 * {@hide} 172 */ 173 protected int mGroupFlags; 174 175 /* 176 * THe layout mode: either {@link #UNDEFINED_LAYOUT_MODE}, {@link #COMPONENT_BOUNDS} or 177 * {@link #LAYOUT_BOUNDS} 178 */ 179 private int mLayoutMode = UNDEFINED_LAYOUT_MODE; 180 181 /** 182 * NOTE: If you change the flags below make sure to reflect the changes 183 * the DisplayList class 184 */ 185 186 // When set, ViewGroup invalidates only the child's rectangle 187 // Set by default 188 static final int FLAG_CLIP_CHILDREN = 0x1; 189 190 // When set, ViewGroup excludes the padding area from the invalidate rectangle 191 // Set by default 192 private static final int FLAG_CLIP_TO_PADDING = 0x2; 193 194 // When set, dispatchDraw() will invoke invalidate(); this is set by drawChild() when 195 // a child needs to be invalidated and FLAG_OPTIMIZE_INVALIDATE is set 196 static final int FLAG_INVALIDATE_REQUIRED = 0x4; 197 198 // When set, dispatchDraw() will run the layout animation and unset the flag 199 private static final int FLAG_RUN_ANIMATION = 0x8; 200 201 // When set, there is either no layout animation on the ViewGroup or the layout 202 // animation is over 203 // Set by default 204 static final int FLAG_ANIMATION_DONE = 0x10; 205 206 // If set, this ViewGroup has padding; if unset there is no padding and we don't need 207 // to clip it, even if FLAG_CLIP_TO_PADDING is set 208 private static final int FLAG_PADDING_NOT_NULL = 0x20; 209 210 // When set, this ViewGroup caches its children in a Bitmap before starting a layout animation 211 // Set by default 212 private static final int FLAG_ANIMATION_CACHE = 0x40; 213 214 // When set, this ViewGroup converts calls to invalidate(Rect) to invalidate() during a 215 // layout animation; this avoid clobbering the hierarchy 216 // Automatically set when the layout animation starts, depending on the animation's 217 // characteristics 218 static final int FLAG_OPTIMIZE_INVALIDATE = 0x80; 219 220 // When set, the next call to drawChild() will clear mChildTransformation's matrix 221 static final int FLAG_CLEAR_TRANSFORMATION = 0x100; 222 223 // When set, this ViewGroup invokes mAnimationListener.onAnimationEnd() and removes 224 // the children's Bitmap caches if necessary 225 // This flag is set when the layout animation is over (after FLAG_ANIMATION_DONE is set) 226 private static final int FLAG_NOTIFY_ANIMATION_LISTENER = 0x200; 227 228 /** 229 * When set, the drawing method will call {@link #getChildDrawingOrder(int, int)} 230 * to get the index of the child to draw for that iteration. 231 * 232 * @hide 233 */ 234 protected static final int FLAG_USE_CHILD_DRAWING_ORDER = 0x400; 235 236 /** 237 * When set, this ViewGroup supports static transformations on children; this causes 238 * {@link #getChildStaticTransformation(View, android.view.animation.Transformation)} to be 239 * invoked when a child is drawn. 240 * 241 * Any subclass overriding 242 * {@link #getChildStaticTransformation(View, android.view.animation.Transformation)} should 243 * set this flags in {@link #mGroupFlags}. 244 * 245 * {@hide} 246 */ 247 protected static final int FLAG_SUPPORT_STATIC_TRANSFORMATIONS = 0x800; 248 249 // When the previous drawChild() invocation used an alpha value that was lower than 250 // 1.0 and set it in mCachePaint 251 static final int FLAG_ALPHA_LOWER_THAN_ONE = 0x1000; 252 253 /** 254 * When set, this ViewGroup's drawable states also include those 255 * of its children. 256 */ 257 private static final int FLAG_ADD_STATES_FROM_CHILDREN = 0x2000; 258 259 /** 260 * When set, this ViewGroup tries to always draw its children using their drawing cache. 261 */ 262 static final int FLAG_ALWAYS_DRAWN_WITH_CACHE = 0x4000; 263 264 /** 265 * When set, and if FLAG_ALWAYS_DRAWN_WITH_CACHE is not set, this ViewGroup will try to 266 * draw its children with their drawing cache. 267 */ 268 static final int FLAG_CHILDREN_DRAWN_WITH_CACHE = 0x8000; 269 270 /** 271 * When set, this group will go through its list of children to notify them of 272 * any drawable state change. 273 */ 274 private static final int FLAG_NOTIFY_CHILDREN_ON_DRAWABLE_STATE_CHANGE = 0x10000; 275 276 private static final int FLAG_MASK_FOCUSABILITY = 0x60000; 277 278 /** 279 * This view will get focus before any of its descendants. 280 */ 281 public static final int FOCUS_BEFORE_DESCENDANTS = 0x20000; 282 283 /** 284 * This view will get focus only if none of its descendants want it. 285 */ 286 public static final int FOCUS_AFTER_DESCENDANTS = 0x40000; 287 288 /** 289 * This view will block any of its descendants from getting focus, even 290 * if they are focusable. 291 */ 292 public static final int FOCUS_BLOCK_DESCENDANTS = 0x60000; 293 294 /** 295 * Used to map between enum in attrubutes and flag values. 296 */ 297 private static final int[] DESCENDANT_FOCUSABILITY_FLAGS = 298 {FOCUS_BEFORE_DESCENDANTS, FOCUS_AFTER_DESCENDANTS, 299 FOCUS_BLOCK_DESCENDANTS}; 300 301 /** 302 * When set, this ViewGroup should not intercept touch events. 303 * {@hide} 304 */ 305 protected static final int FLAG_DISALLOW_INTERCEPT = 0x80000; 306 307 /** 308 * When set, this ViewGroup will split MotionEvents to multiple child Views when appropriate. 309 */ 310 private static final int FLAG_SPLIT_MOTION_EVENTS = 0x200000; 311 312 /** 313 * When set, this ViewGroup will not dispatch onAttachedToWindow calls 314 * to children when adding new views. This is used to prevent multiple 315 * onAttached calls when a ViewGroup adds children in its own onAttached method. 316 */ 317 private static final int FLAG_PREVENT_DISPATCH_ATTACHED_TO_WINDOW = 0x400000; 318 319 /** 320 * Indicates which types of drawing caches are to be kept in memory. 321 * This field should be made private, so it is hidden from the SDK. 322 * {@hide} 323 */ 324 protected int mPersistentDrawingCache; 325 326 /** 327 * Used to indicate that no drawing cache should be kept in memory. 328 */ 329 public static final int PERSISTENT_NO_CACHE = 0x0; 330 331 /** 332 * Used to indicate that the animation drawing cache should be kept in memory. 333 */ 334 public static final int PERSISTENT_ANIMATION_CACHE = 0x1; 335 336 /** 337 * Used to indicate that the scrolling drawing cache should be kept in memory. 338 */ 339 public static final int PERSISTENT_SCROLLING_CACHE = 0x2; 340 341 /** 342 * Used to indicate that all drawing caches should be kept in memory. 343 */ 344 public static final int PERSISTENT_ALL_CACHES = 0x3; 345 346 // Layout Modes 347 348 private static final int UNDEFINED_LAYOUT_MODE = -1; 349 350 /** 351 * This constant is a {@link #setLayoutMode(int) layoutMode}. 352 * Component bounds are the raw values of {@link #getLeft() left}, {@link #getTop() top}, 353 * {@link #getRight() right} and {@link #getBottom() bottom}. 354 */ 355 public static final int COMPONENT_BOUNDS = 0; 356 357 /** 358 * This constant is a {@link #setLayoutMode(int) layoutMode}. 359 */ 360 public static final int LAYOUT_BOUNDS = 1; 361 362 /** 363 * We clip to padding when FLAG_CLIP_TO_PADDING and FLAG_PADDING_NOT_NULL 364 * are set at the same time. 365 */ 366 protected static final int CLIP_TO_PADDING_MASK = FLAG_CLIP_TO_PADDING | FLAG_PADDING_NOT_NULL; 367 368 // Index of the child's left position in the mLocation array 369 private static final int CHILD_LEFT_INDEX = 0; 370 // Index of the child's top position in the mLocation array 371 private static final int CHILD_TOP_INDEX = 1; 372 373 // Child views of this ViewGroup 374 private View[] mChildren; 375 // Number of valid children in the mChildren array, the rest should be null or not 376 // considered as children 377 378 private boolean mLayoutSuppressed = false; 379 380 private int mChildrenCount; 381 382 private static final int ARRAY_INITIAL_CAPACITY = 12; 383 private static final int ARRAY_CAPACITY_INCREMENT = 12; 384 385 // Used to draw cached views 386 Paint mCachePaint; 387 388 // Used to animate add/remove changes in layout 389 private LayoutTransition mTransition; 390 391 // The set of views that are currently being transitioned. This list is used to track views 392 // being removed that should not actually be removed from the parent yet because they are 393 // being animated. 394 private ArrayList<View> mTransitioningViews; 395 396 // List of children changing visibility. This is used to potentially keep rendering 397 // views during a transition when they otherwise would have become gone/invisible 398 private ArrayList<View> mVisibilityChangingChildren; 399 400 // Indicates whether this container will use its children layers to draw 401 @ViewDebug.ExportedProperty(category = "drawing") 402 boolean mDrawLayers = true; 403 404 // Indicates how many of this container's child subtrees contain transient state 405 @ViewDebug.ExportedProperty(category = "layout") 406 private int mChildCountWithTransientState = 0; 407 408 public ViewGroup(Context context) { 409 super(context); 410 initViewGroup(); 411 } 412 413 public ViewGroup(Context context, AttributeSet attrs) { 414 super(context, attrs); 415 initViewGroup(); 416 initFromAttributes(context, attrs); 417 } 418 419 public ViewGroup(Context context, AttributeSet attrs, int defStyle) { 420 super(context, attrs, defStyle); 421 initViewGroup(); 422 initFromAttributes(context, attrs); 423 } 424 425 private boolean debugDraw() { 426 return mAttachInfo != null && mAttachInfo.mDebugLayout; 427 } 428 429 private void initViewGroup() { 430 // ViewGroup doesn't draw by default 431 if (!debugDraw()) { 432 setFlags(WILL_NOT_DRAW, DRAW_MASK); 433 } 434 mGroupFlags |= FLAG_CLIP_CHILDREN; 435 mGroupFlags |= FLAG_CLIP_TO_PADDING; 436 mGroupFlags |= FLAG_ANIMATION_DONE; 437 mGroupFlags |= FLAG_ANIMATION_CACHE; 438 mGroupFlags |= FLAG_ALWAYS_DRAWN_WITH_CACHE; 439 440 if (mContext.getApplicationInfo().targetSdkVersion >= Build.VERSION_CODES.HONEYCOMB) { 441 mGroupFlags |= FLAG_SPLIT_MOTION_EVENTS; 442 } 443 444 setDescendantFocusability(FOCUS_BEFORE_DESCENDANTS); 445 446 mChildren = new View[ARRAY_INITIAL_CAPACITY]; 447 mChildrenCount = 0; 448 449 mPersistentDrawingCache = PERSISTENT_SCROLLING_CACHE; 450 } 451 452 private void initFromAttributes(Context context, AttributeSet attrs) { 453 TypedArray a = context.obtainStyledAttributes(attrs, 454 R.styleable.ViewGroup); 455 456 final int N = a.getIndexCount(); 457 for (int i = 0; i < N; i++) { 458 int attr = a.getIndex(i); 459 switch (attr) { 460 case R.styleable.ViewGroup_clipChildren: 461 setClipChildren(a.getBoolean(attr, true)); 462 break; 463 case R.styleable.ViewGroup_clipToPadding: 464 setClipToPadding(a.getBoolean(attr, true)); 465 break; 466 case R.styleable.ViewGroup_animationCache: 467 setAnimationCacheEnabled(a.getBoolean(attr, true)); 468 break; 469 case R.styleable.ViewGroup_persistentDrawingCache: 470 setPersistentDrawingCache(a.getInt(attr, PERSISTENT_SCROLLING_CACHE)); 471 break; 472 case R.styleable.ViewGroup_addStatesFromChildren: 473 setAddStatesFromChildren(a.getBoolean(attr, false)); 474 break; 475 case R.styleable.ViewGroup_alwaysDrawnWithCache: 476 setAlwaysDrawnWithCacheEnabled(a.getBoolean(attr, true)); 477 break; 478 case R.styleable.ViewGroup_layoutAnimation: 479 int id = a.getResourceId(attr, -1); 480 if (id > 0) { 481 setLayoutAnimation(AnimationUtils.loadLayoutAnimation(mContext, id)); 482 } 483 break; 484 case R.styleable.ViewGroup_descendantFocusability: 485 setDescendantFocusability(DESCENDANT_FOCUSABILITY_FLAGS[a.getInt(attr, 0)]); 486 break; 487 case R.styleable.ViewGroup_splitMotionEvents: 488 setMotionEventSplittingEnabled(a.getBoolean(attr, false)); 489 break; 490 case R.styleable.ViewGroup_animateLayoutChanges: 491 boolean animateLayoutChanges = a.getBoolean(attr, false); 492 if (animateLayoutChanges) { 493 setLayoutTransition(new LayoutTransition()); 494 } 495 break; 496 } 497 } 498 499 a.recycle(); 500 } 501 502 /** 503 * Gets the descendant focusability of this view group. The descendant 504 * focusability defines the relationship between this view group and its 505 * descendants when looking for a view to take focus in 506 * {@link #requestFocus(int, android.graphics.Rect)}. 507 * 508 * @return one of {@link #FOCUS_BEFORE_DESCENDANTS}, {@link #FOCUS_AFTER_DESCENDANTS}, 509 * {@link #FOCUS_BLOCK_DESCENDANTS}. 510 */ 511 @ViewDebug.ExportedProperty(category = "focus", mapping = { 512 @ViewDebug.IntToString(from = FOCUS_BEFORE_DESCENDANTS, to = "FOCUS_BEFORE_DESCENDANTS"), 513 @ViewDebug.IntToString(from = FOCUS_AFTER_DESCENDANTS, to = "FOCUS_AFTER_DESCENDANTS"), 514 @ViewDebug.IntToString(from = FOCUS_BLOCK_DESCENDANTS, to = "FOCUS_BLOCK_DESCENDANTS") 515 }) 516 public int getDescendantFocusability() { 517 return mGroupFlags & FLAG_MASK_FOCUSABILITY; 518 } 519 520 /** 521 * Set the descendant focusability of this view group. This defines the relationship 522 * between this view group and its descendants when looking for a view to 523 * take focus in {@link #requestFocus(int, android.graphics.Rect)}. 524 * 525 * @param focusability one of {@link #FOCUS_BEFORE_DESCENDANTS}, {@link #FOCUS_AFTER_DESCENDANTS}, 526 * {@link #FOCUS_BLOCK_DESCENDANTS}. 527 */ 528 public void setDescendantFocusability(int focusability) { 529 switch (focusability) { 530 case FOCUS_BEFORE_DESCENDANTS: 531 case FOCUS_AFTER_DESCENDANTS: 532 case FOCUS_BLOCK_DESCENDANTS: 533 break; 534 default: 535 throw new IllegalArgumentException("must be one of FOCUS_BEFORE_DESCENDANTS, " 536 + "FOCUS_AFTER_DESCENDANTS, FOCUS_BLOCK_DESCENDANTS"); 537 } 538 mGroupFlags &= ~FLAG_MASK_FOCUSABILITY; 539 mGroupFlags |= (focusability & FLAG_MASK_FOCUSABILITY); 540 } 541 542 /** 543 * {@inheritDoc} 544 */ 545 @Override 546 void handleFocusGainInternal(int direction, Rect previouslyFocusedRect) { 547 if (mFocused != null) { 548 mFocused.unFocus(); 549 mFocused = null; 550 } 551 super.handleFocusGainInternal(direction, previouslyFocusedRect); 552 } 553 554 /** 555 * {@inheritDoc} 556 */ 557 public void requestChildFocus(View child, View focused) { 558 if (DBG) { 559 System.out.println(this + " requestChildFocus()"); 560 } 561 if (getDescendantFocusability() == FOCUS_BLOCK_DESCENDANTS) { 562 return; 563 } 564 565 // Unfocus us, if necessary 566 super.unFocus(); 567 568 // We had a previous notion of who had focus. Clear it. 569 if (mFocused != child) { 570 if (mFocused != null) { 571 mFocused.unFocus(); 572 } 573 574 mFocused = child; 575 } 576 if (mParent != null) { 577 mParent.requestChildFocus(this, focused); 578 } 579 } 580 581 /** 582 * {@inheritDoc} 583 */ 584 public void focusableViewAvailable(View v) { 585 if (mParent != null 586 // shortcut: don't report a new focusable view if we block our descendants from 587 // getting focus 588 && (getDescendantFocusability() != FOCUS_BLOCK_DESCENDANTS) 589 // shortcut: don't report a new focusable view if we already are focused 590 // (and we don't prefer our descendants) 591 // 592 // note: knowing that mFocused is non-null is not a good enough reason 593 // to break the traversal since in that case we'd actually have to find 594 // the focused view and make sure it wasn't FOCUS_AFTER_DESCENDANTS and 595 // an ancestor of v; this will get checked for at ViewAncestor 596 && !(isFocused() && getDescendantFocusability() != FOCUS_AFTER_DESCENDANTS)) { 597 mParent.focusableViewAvailable(v); 598 } 599 } 600 601 /** 602 * {@inheritDoc} 603 */ 604 public boolean showContextMenuForChild(View originalView) { 605 return mParent != null && mParent.showContextMenuForChild(originalView); 606 } 607 608 /** 609 * {@inheritDoc} 610 */ 611 public ActionMode startActionModeForChild(View originalView, ActionMode.Callback callback) { 612 return mParent != null ? mParent.startActionModeForChild(originalView, callback) : null; 613 } 614 615 /** 616 * Find the nearest view in the specified direction that wants to take 617 * focus. 618 * 619 * @param focused The view that currently has focus 620 * @param direction One of FOCUS_UP, FOCUS_DOWN, FOCUS_LEFT, and 621 * FOCUS_RIGHT, or 0 for not applicable. 622 */ 623 public View focusSearch(View focused, int direction) { 624 if (isRootNamespace()) { 625 // root namespace means we should consider ourselves the top of the 626 // tree for focus searching; otherwise we could be focus searching 627 // into other tabs. see LocalActivityManager and TabHost for more info 628 return FocusFinder.getInstance().findNextFocus(this, focused, direction); 629 } else if (mParent != null) { 630 return mParent.focusSearch(focused, direction); 631 } 632 return null; 633 } 634 635 /** 636 * {@inheritDoc} 637 */ 638 public boolean requestChildRectangleOnScreen(View child, Rect rectangle, boolean immediate) { 639 return false; 640 } 641 642 /** 643 * {@inheritDoc} 644 */ 645 @Override 646 public boolean requestSendAccessibilityEvent(View child, AccessibilityEvent event) { 647 ViewParent parent = mParent; 648 if (parent == null) { 649 return false; 650 } 651 final boolean propagate = onRequestSendAccessibilityEvent(child, event); 652 if (!propagate) { 653 return false; 654 } 655 return parent.requestSendAccessibilityEvent(this, event); 656 } 657 658 /** 659 * Called when a child has requested sending an {@link AccessibilityEvent} and 660 * gives an opportunity to its parent to augment the event. 661 * <p> 662 * If an {@link android.view.View.AccessibilityDelegate} has been specified via calling 663 * {@link android.view.View#setAccessibilityDelegate(android.view.View.AccessibilityDelegate)} its 664 * {@link android.view.View.AccessibilityDelegate#onRequestSendAccessibilityEvent(ViewGroup, View, AccessibilityEvent)} 665 * is responsible for handling this call. 666 * </p> 667 * 668 * @param child The child which requests sending the event. 669 * @param event The event to be sent. 670 * @return True if the event should be sent. 671 * 672 * @see #requestSendAccessibilityEvent(View, AccessibilityEvent) 673 */ 674 public boolean onRequestSendAccessibilityEvent(View child, AccessibilityEvent event) { 675 if (mAccessibilityDelegate != null) { 676 return mAccessibilityDelegate.onRequestSendAccessibilityEvent(this, child, event); 677 } else { 678 return onRequestSendAccessibilityEventInternal(child, event); 679 } 680 } 681 682 /** 683 * @see #onRequestSendAccessibilityEvent(View, AccessibilityEvent) 684 * 685 * Note: Called from the default {@link View.AccessibilityDelegate}. 686 */ 687 boolean onRequestSendAccessibilityEventInternal(View child, AccessibilityEvent event) { 688 return true; 689 } 690 691 /** 692 * Called when a child view has changed whether or not it is tracking transient state. 693 * 694 * @hide 695 */ 696 public void childHasTransientStateChanged(View child, boolean childHasTransientState) { 697 final boolean oldHasTransientState = hasTransientState(); 698 if (childHasTransientState) { 699 mChildCountWithTransientState++; 700 } else { 701 mChildCountWithTransientState--; 702 } 703 704 final boolean newHasTransientState = hasTransientState(); 705 if (mParent != null && oldHasTransientState != newHasTransientState) { 706 try { 707 mParent.childHasTransientStateChanged(this, newHasTransientState); 708 } catch (AbstractMethodError e) { 709 Log.e(TAG, mParent.getClass().getSimpleName() + 710 " does not fully implement ViewParent", e); 711 } 712 } 713 } 714 715 /** 716 * @hide 717 */ 718 @Override 719 public boolean hasTransientState() { 720 return mChildCountWithTransientState > 0 || super.hasTransientState(); 721 } 722 723 /** 724 * {@inheritDoc} 725 */ 726 @Override 727 public boolean dispatchUnhandledMove(View focused, int direction) { 728 return mFocused != null && 729 mFocused.dispatchUnhandledMove(focused, direction); 730 } 731 732 /** 733 * {@inheritDoc} 734 */ 735 public void clearChildFocus(View child) { 736 if (DBG) { 737 System.out.println(this + " clearChildFocus()"); 738 } 739 740 mFocused = null; 741 if (mParent != null) { 742 mParent.clearChildFocus(this); 743 } 744 } 745 746 /** 747 * {@inheritDoc} 748 */ 749 @Override 750 public void clearFocus() { 751 if (DBG) { 752 System.out.println(this + " clearFocus()"); 753 } 754 if (mFocused == null) { 755 super.clearFocus(); 756 } else { 757 mFocused.clearFocus(); 758 mFocused = null; 759 } 760 } 761 762 /** 763 * {@inheritDoc} 764 */ 765 @Override 766 void unFocus() { 767 if (DBG) { 768 System.out.println(this + " unFocus()"); 769 } 770 if (mFocused == null) { 771 super.unFocus(); 772 } else { 773 mFocused.unFocus(); 774 mFocused = null; 775 } 776 } 777 778 /** 779 * Returns the focused child of this view, if any. The child may have focus 780 * or contain focus. 781 * 782 * @return the focused child or null. 783 */ 784 public View getFocusedChild() { 785 return mFocused; 786 } 787 788 /** 789 * Returns true if this view has or contains focus 790 * 791 * @return true if this view has or contains focus 792 */ 793 @Override 794 public boolean hasFocus() { 795 return (mPrivateFlags & FOCUSED) != 0 || mFocused != null; 796 } 797 798 /* 799 * (non-Javadoc) 800 * 801 * @see android.view.View#findFocus() 802 */ 803 @Override 804 public View findFocus() { 805 if (DBG) { 806 System.out.println("Find focus in " + this + ": flags=" 807 + isFocused() + ", child=" + mFocused); 808 } 809 810 if (isFocused()) { 811 return this; 812 } 813 814 if (mFocused != null) { 815 return mFocused.findFocus(); 816 } 817 return null; 818 } 819 820 /** 821 * {@inheritDoc} 822 */ 823 @Override 824 public boolean hasFocusable() { 825 if ((mViewFlags & VISIBILITY_MASK) != VISIBLE) { 826 return false; 827 } 828 829 if (isFocusable()) { 830 return true; 831 } 832 833 final int descendantFocusability = getDescendantFocusability(); 834 if (descendantFocusability != FOCUS_BLOCK_DESCENDANTS) { 835 final int count = mChildrenCount; 836 final View[] children = mChildren; 837 838 for (int i = 0; i < count; i++) { 839 final View child = children[i]; 840 if (child.hasFocusable()) { 841 return true; 842 } 843 } 844 } 845 846 return false; 847 } 848 849 /** 850 * {@inheritDoc} 851 */ 852 @Override 853 public void addFocusables(ArrayList<View> views, int direction) { 854 addFocusables(views, direction, FOCUSABLES_TOUCH_MODE); 855 } 856 857 /** 858 * {@inheritDoc} 859 */ 860 @Override 861 public void addFocusables(ArrayList<View> views, int direction, int focusableMode) { 862 final int focusableCount = views.size(); 863 864 final int descendantFocusability = getDescendantFocusability(); 865 866 if (descendantFocusability != FOCUS_BLOCK_DESCENDANTS) { 867 final int count = mChildrenCount; 868 final View[] children = mChildren; 869 870 for (int i = 0; i < count; i++) { 871 final View child = children[i]; 872 if ((child.mViewFlags & VISIBILITY_MASK) == VISIBLE) { 873 child.addFocusables(views, direction, focusableMode); 874 } 875 } 876 } 877 878 // we add ourselves (if focusable) in all cases except for when we are 879 // FOCUS_AFTER_DESCENDANTS and there are some descendants focusable. this is 880 // to avoid the focus search finding layouts when a more precise search 881 // among the focusable children would be more interesting. 882 if ( 883 descendantFocusability != FOCUS_AFTER_DESCENDANTS || 884 // No focusable descendants 885 (focusableCount == views.size())) { 886 super.addFocusables(views, direction, focusableMode); 887 } 888 } 889 890 @Override 891 public void findViewsWithText(ArrayList<View> outViews, CharSequence text, int flags) { 892 super.findViewsWithText(outViews, text, flags); 893 final int childrenCount = mChildrenCount; 894 final View[] children = mChildren; 895 for (int i = 0; i < childrenCount; i++) { 896 View child = children[i]; 897 if ((child.mViewFlags & VISIBILITY_MASK) == VISIBLE 898 && (child.mPrivateFlags & IS_ROOT_NAMESPACE) == 0) { 899 child.findViewsWithText(outViews, text, flags); 900 } 901 } 902 } 903 904 @Override 905 View findViewByAccessibilityIdTraversal(int accessibilityId) { 906 View foundView = super.findViewByAccessibilityIdTraversal(accessibilityId); 907 if (foundView != null) { 908 return foundView; 909 } 910 final int childrenCount = mChildrenCount; 911 final View[] children = mChildren; 912 for (int i = 0; i < childrenCount; i++) { 913 View child = children[i]; 914 foundView = child.findViewByAccessibilityIdTraversal(accessibilityId); 915 if (foundView != null) { 916 return foundView; 917 } 918 } 919 return null; 920 } 921 922 /** 923 * {@inheritDoc} 924 */ 925 @Override 926 public void dispatchWindowFocusChanged(boolean hasFocus) { 927 super.dispatchWindowFocusChanged(hasFocus); 928 final int count = mChildrenCount; 929 final View[] children = mChildren; 930 for (int i = 0; i < count; i++) { 931 children[i].dispatchWindowFocusChanged(hasFocus); 932 } 933 } 934 935 /** 936 * {@inheritDoc} 937 */ 938 @Override 939 public void addTouchables(ArrayList<View> views) { 940 super.addTouchables(views); 941 942 final int count = mChildrenCount; 943 final View[] children = mChildren; 944 945 for (int i = 0; i < count; i++) { 946 final View child = children[i]; 947 if ((child.mViewFlags & VISIBILITY_MASK) == VISIBLE) { 948 child.addTouchables(views); 949 } 950 } 951 } 952 953 /** 954 * @hide 955 */ 956 @Override 957 public void makeOptionalFitsSystemWindows() { 958 super.makeOptionalFitsSystemWindows(); 959 final int count = mChildrenCount; 960 final View[] children = mChildren; 961 for (int i = 0; i < count; i++) { 962 children[i].makeOptionalFitsSystemWindows(); 963 } 964 } 965 966 /** 967 * {@inheritDoc} 968 */ 969 @Override 970 public void dispatchDisplayHint(int hint) { 971 super.dispatchDisplayHint(hint); 972 final int count = mChildrenCount; 973 final View[] children = mChildren; 974 for (int i = 0; i < count; i++) { 975 children[i].dispatchDisplayHint(hint); 976 } 977 } 978 979 /** 980 * Called when a view's visibility has changed. Notify the parent to take any appropriate 981 * action. 982 * 983 * @param child The view whose visibility has changed 984 * @param oldVisibility The previous visibility value (GONE, INVISIBLE, or VISIBLE). 985 * @param newVisibility The new visibility value (GONE, INVISIBLE, or VISIBLE). 986 * @hide 987 */ 988 protected void onChildVisibilityChanged(View child, int oldVisibility, int newVisibility) { 989 if (mTransition != null) { 990 if (newVisibility == VISIBLE) { 991 mTransition.showChild(this, child, oldVisibility); 992 } else { 993 mTransition.hideChild(this, child, newVisibility); 994 // Only track this on disappearing views - appearing views are already visible 995 // and don't need special handling during drawChild() 996 if (mVisibilityChangingChildren == null) { 997 mVisibilityChangingChildren = new ArrayList<View>(); 998 } 999 mVisibilityChangingChildren.add(child); 1000 if (mTransitioningViews != null && mTransitioningViews.contains(child)) { 1001 addDisappearingView(child); 1002 } 1003 } 1004 } 1005 1006 // in all cases, for drags 1007 if (mCurrentDrag != null) { 1008 if (newVisibility == VISIBLE) { 1009 notifyChildOfDrag(child); 1010 } 1011 } 1012 } 1013 1014 /** 1015 * {@inheritDoc} 1016 */ 1017 @Override 1018 protected void dispatchVisibilityChanged(View changedView, int visibility) { 1019 super.dispatchVisibilityChanged(changedView, visibility); 1020 final int count = mChildrenCount; 1021 final View[] children = mChildren; 1022 for (int i = 0; i < count; i++) { 1023 children[i].dispatchVisibilityChanged(changedView, visibility); 1024 } 1025 } 1026 1027 /** 1028 * {@inheritDoc} 1029 */ 1030 @Override 1031 public void dispatchWindowVisibilityChanged(int visibility) { 1032 super.dispatchWindowVisibilityChanged(visibility); 1033 final int count = mChildrenCount; 1034 final View[] children = mChildren; 1035 for (int i = 0; i < count; i++) { 1036 children[i].dispatchWindowVisibilityChanged(visibility); 1037 } 1038 } 1039 1040 /** 1041 * {@inheritDoc} 1042 */ 1043 @Override 1044 public void dispatchConfigurationChanged(Configuration newConfig) { 1045 super.dispatchConfigurationChanged(newConfig); 1046 final int count = mChildrenCount; 1047 final View[] children = mChildren; 1048 for (int i = 0; i < count; i++) { 1049 children[i].dispatchConfigurationChanged(newConfig); 1050 } 1051 } 1052 1053 /** 1054 * {@inheritDoc} 1055 */ 1056 public void recomputeViewAttributes(View child) { 1057 if (mAttachInfo != null && !mAttachInfo.mRecomputeGlobalAttributes) { 1058 ViewParent parent = mParent; 1059 if (parent != null) parent.recomputeViewAttributes(this); 1060 } 1061 } 1062 1063 @Override 1064 void dispatchCollectViewAttributes(AttachInfo attachInfo, int visibility) { 1065 if ((visibility & VISIBILITY_MASK) == VISIBLE) { 1066 super.dispatchCollectViewAttributes(attachInfo, visibility); 1067 final int count = mChildrenCount; 1068 final View[] children = mChildren; 1069 for (int i = 0; i < count; i++) { 1070 final View child = children[i]; 1071 child.dispatchCollectViewAttributes(attachInfo, 1072 visibility | (child.mViewFlags&VISIBILITY_MASK)); 1073 } 1074 } 1075 } 1076 1077 /** 1078 * {@inheritDoc} 1079 */ 1080 public void bringChildToFront(View child) { 1081 int index = indexOfChild(child); 1082 if (index >= 0) { 1083 removeFromArray(index); 1084 addInArray(child, mChildrenCount); 1085 child.mParent = this; 1086 } 1087 } 1088 1089 /** 1090 * {@inheritDoc} 1091 */ 1092 // TODO: Write real docs 1093 @Override 1094 public boolean dispatchDragEvent(DragEvent event) { 1095 boolean retval = false; 1096 final float tx = event.mX; 1097 final float ty = event.mY; 1098 1099 ViewRootImpl root = getViewRootImpl(); 1100 1101 // Dispatch down the view hierarchy 1102 switch (event.mAction) { 1103 case DragEvent.ACTION_DRAG_STARTED: { 1104 // clear state to recalculate which views we drag over 1105 mCurrentDragView = null; 1106 1107 // Set up our tracking of drag-started notifications 1108 mCurrentDrag = DragEvent.obtain(event); 1109 if (mDragNotifiedChildren == null) { 1110 mDragNotifiedChildren = new HashSet<View>(); 1111 } else { 1112 mDragNotifiedChildren.clear(); 1113 } 1114 1115 // Now dispatch down to our children, caching the responses 1116 mChildAcceptsDrag = false; 1117 final int count = mChildrenCount; 1118 final View[] children = mChildren; 1119 for (int i = 0; i < count; i++) { 1120 final View child = children[i]; 1121 child.mPrivateFlags2 &= ~View.DRAG_MASK; 1122 if (child.getVisibility() == VISIBLE) { 1123 final boolean handled = notifyChildOfDrag(children[i]); 1124 if (handled) { 1125 mChildAcceptsDrag = true; 1126 } 1127 } 1128 } 1129 1130 // Return HANDLED if one of our children can accept the drag 1131 if (mChildAcceptsDrag) { 1132 retval = true; 1133 } 1134 } break; 1135 1136 case DragEvent.ACTION_DRAG_ENDED: { 1137 // Release the bookkeeping now that the drag lifecycle has ended 1138 if (mDragNotifiedChildren != null) { 1139 for (View child : mDragNotifiedChildren) { 1140 // If a child was notified about an ongoing drag, it's told that it's over 1141 child.dispatchDragEvent(event); 1142 child.mPrivateFlags2 &= ~View.DRAG_MASK; 1143 child.refreshDrawableState(); 1144 } 1145 1146 mDragNotifiedChildren.clear(); 1147 mCurrentDrag.recycle(); 1148 mCurrentDrag = null; 1149 } 1150 1151 // We consider drag-ended to have been handled if one of our children 1152 // had offered to handle the drag. 1153 if (mChildAcceptsDrag) { 1154 retval = true; 1155 } 1156 } break; 1157 1158 case DragEvent.ACTION_DRAG_LOCATION: { 1159 // Find the [possibly new] drag target 1160 final View target = findFrontmostDroppableChildAt(event.mX, event.mY, mLocalPoint); 1161 1162 // If we've changed apparent drag target, tell the view root which view 1163 // we're over now [for purposes of the eventual drag-recipient-changed 1164 // notifications to the framework] and tell the new target that the drag 1165 // has entered its bounds. The root will see setDragFocus() calls all 1166 // the way down to the final leaf view that is handling the LOCATION event 1167 // before reporting the new potential recipient to the framework. 1168 if (mCurrentDragView != target) { 1169 root.setDragFocus(target); 1170 1171 final int action = event.mAction; 1172 // If we've dragged off of a child view, send it the EXITED message 1173 if (mCurrentDragView != null) { 1174 final View view = mCurrentDragView; 1175 event.mAction = DragEvent.ACTION_DRAG_EXITED; 1176 view.dispatchDragEvent(event); 1177 view.mPrivateFlags2 &= ~View.DRAG_HOVERED; 1178 view.refreshDrawableState(); 1179 } 1180 mCurrentDragView = target; 1181 1182 // If we've dragged over a new child view, send it the ENTERED message 1183 if (target != null) { 1184 event.mAction = DragEvent.ACTION_DRAG_ENTERED; 1185 target.dispatchDragEvent(event); 1186 target.mPrivateFlags2 |= View.DRAG_HOVERED; 1187 target.refreshDrawableState(); 1188 } 1189 event.mAction = action; // restore the event's original state 1190 } 1191 1192 // Dispatch the actual drag location notice, localized into its coordinates 1193 if (target != null) { 1194 event.mX = mLocalPoint.x; 1195 event.mY = mLocalPoint.y; 1196 1197 retval = target.dispatchDragEvent(event); 1198 1199 event.mX = tx; 1200 event.mY = ty; 1201 } 1202 } break; 1203 1204 /* Entered / exited dispatch 1205 * 1206 * DRAG_ENTERED is not dispatched downwards from ViewGroup. The reason for this is 1207 * that we're about to get the corresponding LOCATION event, which we will use to 1208 * determine which of our children is the new target; at that point we will 1209 * push a DRAG_ENTERED down to the new target child [which may itself be a ViewGroup]. 1210 * 1211 * DRAG_EXITED *is* dispatched all the way down immediately: once we know the 1212 * drag has left this ViewGroup, we know by definition that every contained subview 1213 * is also no longer under the drag point. 1214 */ 1215 1216 case DragEvent.ACTION_DRAG_EXITED: { 1217 if (mCurrentDragView != null) { 1218 final View view = mCurrentDragView; 1219 view.dispatchDragEvent(event); 1220 view.mPrivateFlags2 &= ~View.DRAG_HOVERED; 1221 view.refreshDrawableState(); 1222 1223 mCurrentDragView = null; 1224 } 1225 } break; 1226 1227 case DragEvent.ACTION_DROP: { 1228 if (ViewDebug.DEBUG_DRAG) Log.d(View.VIEW_LOG_TAG, "Drop event: " + event); 1229 View target = findFrontmostDroppableChildAt(event.mX, event.mY, mLocalPoint); 1230 if (target != null) { 1231 if (ViewDebug.DEBUG_DRAG) Log.d(View.VIEW_LOG_TAG, " dispatch drop to " + target); 1232 event.mX = mLocalPoint.x; 1233 event.mY = mLocalPoint.y; 1234 retval = target.dispatchDragEvent(event); 1235 event.mX = tx; 1236 event.mY = ty; 1237 } else { 1238 if (ViewDebug.DEBUG_DRAG) { 1239 Log.d(View.VIEW_LOG_TAG, " not dropped on an accepting view"); 1240 } 1241 } 1242 } break; 1243 } 1244 1245 // If none of our children could handle the event, try here 1246 if (!retval) { 1247 // Call up to the View implementation that dispatches to installed listeners 1248 retval = super.dispatchDragEvent(event); 1249 } 1250 return retval; 1251 } 1252 1253 // Find the frontmost child view that lies under the given point, and calculate 1254 // the position within its own local coordinate system. 1255 View findFrontmostDroppableChildAt(float x, float y, PointF outLocalPoint) { 1256 final int count = mChildrenCount; 1257 final View[] children = mChildren; 1258 for (int i = count - 1; i >= 0; i--) { 1259 final View child = children[i]; 1260 if (!child.canAcceptDrag()) { 1261 continue; 1262 } 1263 1264 if (isTransformedTouchPointInView(x, y, child, outLocalPoint)) { 1265 return child; 1266 } 1267 } 1268 return null; 1269 } 1270 1271 boolean notifyChildOfDrag(View child) { 1272 if (ViewDebug.DEBUG_DRAG) { 1273 Log.d(View.VIEW_LOG_TAG, "Sending drag-started to view: " + child); 1274 } 1275 1276 boolean canAccept = false; 1277 if (! mDragNotifiedChildren.contains(child)) { 1278 mDragNotifiedChildren.add(child); 1279 canAccept = child.dispatchDragEvent(mCurrentDrag); 1280 if (canAccept && !child.canAcceptDrag()) { 1281 child.mPrivateFlags2 |= View.DRAG_CAN_ACCEPT; 1282 child.refreshDrawableState(); 1283 } 1284 } 1285 return canAccept; 1286 } 1287 1288 @Override 1289 public void dispatchWindowSystemUiVisiblityChanged(int visible) { 1290 super.dispatchWindowSystemUiVisiblityChanged(visible); 1291 1292 final int count = mChildrenCount; 1293 final View[] children = mChildren; 1294 for (int i=0; i <count; i++) { 1295 final View child = children[i]; 1296 child.dispatchWindowSystemUiVisiblityChanged(visible); 1297 } 1298 } 1299 1300 @Override 1301 public void dispatchSystemUiVisibilityChanged(int visible) { 1302 super.dispatchSystemUiVisibilityChanged(visible); 1303 1304 final int count = mChildrenCount; 1305 final View[] children = mChildren; 1306 for (int i=0; i <count; i++) { 1307 final View child = children[i]; 1308 child.dispatchSystemUiVisibilityChanged(visible); 1309 } 1310 } 1311 1312 @Override 1313 void updateLocalSystemUiVisibility(int localValue, int localChanges) { 1314 super.updateLocalSystemUiVisibility(localValue, localChanges); 1315 1316 final int count = mChildrenCount; 1317 final View[] children = mChildren; 1318 for (int i=0; i <count; i++) { 1319 final View child = children[i]; 1320 child.updateLocalSystemUiVisibility(localValue, localChanges); 1321 } 1322 } 1323 1324 /** 1325 * {@inheritDoc} 1326 */ 1327 @Override 1328 public boolean dispatchKeyEventPreIme(KeyEvent event) { 1329 if ((mPrivateFlags & (FOCUSED | HAS_BOUNDS)) == (FOCUSED | HAS_BOUNDS)) { 1330 return super.dispatchKeyEventPreIme(event); 1331 } else if (mFocused != null && (mFocused.mPrivateFlags & HAS_BOUNDS) == HAS_BOUNDS) { 1332 return mFocused.dispatchKeyEventPreIme(event); 1333 } 1334 return false; 1335 } 1336 1337 /** 1338 * {@inheritDoc} 1339 */ 1340 @Override 1341 public boolean dispatchKeyEvent(KeyEvent event) { 1342 if (mInputEventConsistencyVerifier != null) { 1343 mInputEventConsistencyVerifier.onKeyEvent(event, 1); 1344 } 1345 1346 if ((mPrivateFlags & (FOCUSED | HAS_BOUNDS)) == (FOCUSED | HAS_BOUNDS)) { 1347 if (super.dispatchKeyEvent(event)) { 1348 return true; 1349 } 1350 } else if (mFocused != null && (mFocused.mPrivateFlags & HAS_BOUNDS) == HAS_BOUNDS) { 1351 if (mFocused.dispatchKeyEvent(event)) { 1352 return true; 1353 } 1354 } 1355 1356 if (mInputEventConsistencyVerifier != null) { 1357 mInputEventConsistencyVerifier.onUnhandledEvent(event, 1); 1358 } 1359 return false; 1360 } 1361 1362 /** 1363 * {@inheritDoc} 1364 */ 1365 @Override 1366 public boolean dispatchKeyShortcutEvent(KeyEvent event) { 1367 if ((mPrivateFlags & (FOCUSED | HAS_BOUNDS)) == (FOCUSED | HAS_BOUNDS)) { 1368 return super.dispatchKeyShortcutEvent(event); 1369 } else if (mFocused != null && (mFocused.mPrivateFlags & HAS_BOUNDS) == HAS_BOUNDS) { 1370 return mFocused.dispatchKeyShortcutEvent(event); 1371 } 1372 return false; 1373 } 1374 1375 /** 1376 * {@inheritDoc} 1377 */ 1378 @Override 1379 public boolean dispatchTrackballEvent(MotionEvent event) { 1380 if (mInputEventConsistencyVerifier != null) { 1381 mInputEventConsistencyVerifier.onTrackballEvent(event, 1); 1382 } 1383 1384 if ((mPrivateFlags & (FOCUSED | HAS_BOUNDS)) == (FOCUSED | HAS_BOUNDS)) { 1385 if (super.dispatchTrackballEvent(event)) { 1386 return true; 1387 } 1388 } else if (mFocused != null && (mFocused.mPrivateFlags & HAS_BOUNDS) == HAS_BOUNDS) { 1389 if (mFocused.dispatchTrackballEvent(event)) { 1390 return true; 1391 } 1392 } 1393 1394 if (mInputEventConsistencyVerifier != null) { 1395 mInputEventConsistencyVerifier.onUnhandledEvent(event, 1); 1396 } 1397 return false; 1398 } 1399 1400 /** 1401 * {@inheritDoc} 1402 */ 1403 @SuppressWarnings({"ConstantConditions"}) 1404 @Override 1405 protected boolean dispatchHoverEvent(MotionEvent event) { 1406 final int action = event.getAction(); 1407 1408 // First check whether the view group wants to intercept the hover event. 1409 final boolean interceptHover = onInterceptHoverEvent(event); 1410 event.setAction(action); // restore action in case it was changed 1411 1412 MotionEvent eventNoHistory = event; 1413 boolean handled = false; 1414 1415 // Send events to the hovered children and build a new list of hover targets until 1416 // one is found that handles the event. 1417 HoverTarget firstOldHoverTarget = mFirstHoverTarget; 1418 mFirstHoverTarget = null; 1419 if (!interceptHover && action != MotionEvent.ACTION_HOVER_EXIT) { 1420 final float x = event.getX(); 1421 final float y = event.getY(); 1422 final int childrenCount = mChildrenCount; 1423 if (childrenCount != 0) { 1424 final View[] children = mChildren; 1425 HoverTarget lastHoverTarget = null; 1426 for (int i = childrenCount - 1; i >= 0; i--) { 1427 final View child = children[i]; 1428 if (!canViewReceivePointerEvents(child) 1429 || !isTransformedTouchPointInView(x, y, child, null)) { 1430 continue; 1431 } 1432 1433 // Obtain a hover target for this child. Dequeue it from the 1434 // old hover target list if the child was previously hovered. 1435 HoverTarget hoverTarget = firstOldHoverTarget; 1436 final boolean wasHovered; 1437 for (HoverTarget predecessor = null; ;) { 1438 if (hoverTarget == null) { 1439 hoverTarget = HoverTarget.obtain(child); 1440 wasHovered = false; 1441 break; 1442 } 1443 1444 if (hoverTarget.child == child) { 1445 if (predecessor != null) { 1446 predecessor.next = hoverTarget.next; 1447 } else { 1448 firstOldHoverTarget = hoverTarget.next; 1449 } 1450 hoverTarget.next = null; 1451 wasHovered = true; 1452 break; 1453 } 1454 1455 predecessor = hoverTarget; 1456 hoverTarget = hoverTarget.next; 1457 } 1458 1459 // Enqueue the hover target onto the new hover target list. 1460 if (lastHoverTarget != null) { 1461 lastHoverTarget.next = hoverTarget; 1462 } else { 1463 lastHoverTarget = hoverTarget; 1464 mFirstHoverTarget = hoverTarget; 1465 } 1466 1467 // Dispatch the event to the child. 1468 if (action == MotionEvent.ACTION_HOVER_ENTER) { 1469 if (!wasHovered) { 1470 // Send the enter as is. 1471 handled |= dispatchTransformedGenericPointerEvent( 1472 event, child); // enter 1473 } 1474 } else if (action == MotionEvent.ACTION_HOVER_MOVE) { 1475 if (!wasHovered) { 1476 // Synthesize an enter from a move. 1477 eventNoHistory = obtainMotionEventNoHistoryOrSelf(eventNoHistory); 1478 eventNoHistory.setAction(MotionEvent.ACTION_HOVER_ENTER); 1479 handled |= dispatchTransformedGenericPointerEvent( 1480 eventNoHistory, child); // enter 1481 eventNoHistory.setAction(action); 1482 1483 handled |= dispatchTransformedGenericPointerEvent( 1484 eventNoHistory, child); // move 1485 } else { 1486 // Send the move as is. 1487 handled |= dispatchTransformedGenericPointerEvent(event, child); 1488 } 1489 } 1490 if (handled) { 1491 break; 1492 } 1493 } 1494 } 1495 } 1496 1497 // Send exit events to all previously hovered children that are no longer hovered. 1498 while (firstOldHoverTarget != null) { 1499 final View child = firstOldHoverTarget.child; 1500 1501 // Exit the old hovered child. 1502 if (action == MotionEvent.ACTION_HOVER_EXIT) { 1503 // Send the exit as is. 1504 handled |= dispatchTransformedGenericPointerEvent( 1505 event, child); // exit 1506 } else { 1507 // Synthesize an exit from a move or enter. 1508 // Ignore the result because hover focus has moved to a different view. 1509 if (action == MotionEvent.ACTION_HOVER_MOVE) { 1510 dispatchTransformedGenericPointerEvent( 1511 event, child); // move 1512 } 1513 eventNoHistory = obtainMotionEventNoHistoryOrSelf(eventNoHistory); 1514 eventNoHistory.setAction(MotionEvent.ACTION_HOVER_EXIT); 1515 dispatchTransformedGenericPointerEvent( 1516 eventNoHistory, child); // exit 1517 eventNoHistory.setAction(action); 1518 } 1519 1520 final HoverTarget nextOldHoverTarget = firstOldHoverTarget.next; 1521 firstOldHoverTarget.recycle(); 1522 firstOldHoverTarget = nextOldHoverTarget; 1523 } 1524 1525 // Send events to the view group itself if no children have handled it. 1526 boolean newHoveredSelf = !handled; 1527 if (newHoveredSelf == mHoveredSelf) { 1528 if (newHoveredSelf) { 1529 // Send event to the view group as before. 1530 handled |= super.dispatchHoverEvent(event); 1531 } 1532 } else { 1533 if (mHoveredSelf) { 1534 // Exit the view group. 1535 if (action == MotionEvent.ACTION_HOVER_EXIT) { 1536 // Send the exit as is. 1537 handled |= super.dispatchHoverEvent(event); // exit 1538 } else { 1539 // Synthesize an exit from a move or enter. 1540 // Ignore the result because hover focus is moving to a different view. 1541 if (action == MotionEvent.ACTION_HOVER_MOVE) { 1542 super.dispatchHoverEvent(event); // move 1543 } 1544 eventNoHistory = obtainMotionEventNoHistoryOrSelf(eventNoHistory); 1545 eventNoHistory.setAction(MotionEvent.ACTION_HOVER_EXIT); 1546 super.dispatchHoverEvent(eventNoHistory); // exit 1547 eventNoHistory.setAction(action); 1548 } 1549 mHoveredSelf = false; 1550 } 1551 1552 if (newHoveredSelf) { 1553 // Enter the view group. 1554 if (action == MotionEvent.ACTION_HOVER_ENTER) { 1555 // Send the enter as is. 1556 handled |= super.dispatchHoverEvent(event); // enter 1557 mHoveredSelf = true; 1558 } else if (action == MotionEvent.ACTION_HOVER_MOVE) { 1559 // Synthesize an enter from a move. 1560 eventNoHistory = obtainMotionEventNoHistoryOrSelf(eventNoHistory); 1561 eventNoHistory.setAction(MotionEvent.ACTION_HOVER_ENTER); 1562 handled |= super.dispatchHoverEvent(eventNoHistory); // enter 1563 eventNoHistory.setAction(action); 1564 1565 handled |= super.dispatchHoverEvent(eventNoHistory); // move 1566 mHoveredSelf = true; 1567 } 1568 } 1569 } 1570 1571 // Recycle the copy of the event that we made. 1572 if (eventNoHistory != event) { 1573 eventNoHistory.recycle(); 1574 } 1575 1576 // Done. 1577 return handled; 1578 } 1579 1580 /** @hide */ 1581 @Override 1582 protected boolean hasHoveredChild() { 1583 return mFirstHoverTarget != null; 1584 } 1585 1586 @Override 1587 public void addChildrenForAccessibility(ArrayList<View> childrenForAccessibility) { 1588 View[] children = mChildren; 1589 final int childrenCount = mChildrenCount; 1590 for (int i = 0; i < childrenCount; i++) { 1591 View child = children[i]; 1592 if ((child.mViewFlags & VISIBILITY_MASK) == VISIBLE 1593 && (child.mPrivateFlags & IS_ROOT_NAMESPACE) == 0) { 1594 if (child.includeForAccessibility()) { 1595 childrenForAccessibility.add(child); 1596 } else { 1597 child.addChildrenForAccessibility(childrenForAccessibility); 1598 } 1599 } 1600 } 1601 } 1602 1603 /** 1604 * @hide 1605 */ 1606 @Override 1607 public void childAccessibilityStateChanged(View child) { 1608 if (mParent != null) { 1609 mParent.childAccessibilityStateChanged(child); 1610 } 1611 } 1612 1613 /** 1614 * Implement this method to intercept hover events before they are handled 1615 * by child views. 1616 * <p> 1617 * This method is called before dispatching a hover event to a child of 1618 * the view group or to the view group's own {@link #onHoverEvent} to allow 1619 * the view group a chance to intercept the hover event. 1620 * This method can also be used to watch all pointer motions that occur within 1621 * the bounds of the view group even when the pointer is hovering over 1622 * a child of the view group rather than over the view group itself. 1623 * </p><p> 1624 * The view group can prevent its children from receiving hover events by 1625 * implementing this method and returning <code>true</code> to indicate 1626 * that it would like to intercept hover events. The view group must 1627 * continuously return <code>true</code> from {@link #onInterceptHoverEvent} 1628 * for as long as it wishes to continue intercepting hover events from 1629 * its children. 1630 * </p><p> 1631 * Interception preserves the invariant that at most one view can be 1632 * hovered at a time by transferring hover focus from the currently hovered 1633 * child to the view group or vice-versa as needed. 1634 * </p><p> 1635 * If this method returns <code>true</code> and a child is already hovered, then the 1636 * child view will first receive a hover exit event and then the view group 1637 * itself will receive a hover enter event in {@link #onHoverEvent}. 1638 * Likewise, if this method had previously returned <code>true</code> to intercept hover 1639 * events and instead returns <code>false</code> while the pointer is hovering 1640 * within the bounds of one of a child, then the view group will first receive a 1641 * hover exit event in {@link #onHoverEvent} and then the hovered child will 1642 * receive a hover enter event. 1643 * </p><p> 1644 * The default implementation always returns false. 1645 * </p> 1646 * 1647 * @param event The motion event that describes the hover. 1648 * @return True if the view group would like to intercept the hover event 1649 * and prevent its children from receiving it. 1650 */ 1651 public boolean onInterceptHoverEvent(MotionEvent event) { 1652 return false; 1653 } 1654 1655 private static MotionEvent obtainMotionEventNoHistoryOrSelf(MotionEvent event) { 1656 if (event.getHistorySize() == 0) { 1657 return event; 1658 } 1659 return MotionEvent.obtainNoHistory(event); 1660 } 1661 1662 /** 1663 * {@inheritDoc} 1664 */ 1665 @Override 1666 protected boolean dispatchGenericPointerEvent(MotionEvent event) { 1667 // Send the event to the child under the pointer. 1668 final int childrenCount = mChildrenCount; 1669 if (childrenCount != 0) { 1670 final View[] children = mChildren; 1671 final float x = event.getX(); 1672 final float y = event.getY(); 1673 1674 for (int i = childrenCount - 1; i >= 0; i--) { 1675 final View child = children[i]; 1676 if (!canViewReceivePointerEvents(child) 1677 || !isTransformedTouchPointInView(x, y, child, null)) { 1678 continue; 1679 } 1680 1681 if (dispatchTransformedGenericPointerEvent(event, child)) { 1682 return true; 1683 } 1684 } 1685 } 1686 1687 // No child handled the event. Send it to this view group. 1688 return super.dispatchGenericPointerEvent(event); 1689 } 1690 1691 /** 1692 * {@inheritDoc} 1693 */ 1694 @Override 1695 protected boolean dispatchGenericFocusedEvent(MotionEvent event) { 1696 // Send the event to the focused child or to this view group if it has focus. 1697 if ((mPrivateFlags & (FOCUSED | HAS_BOUNDS)) == (FOCUSED | HAS_BOUNDS)) { 1698 return super.dispatchGenericFocusedEvent(event); 1699 } else if (mFocused != null && (mFocused.mPrivateFlags & HAS_BOUNDS) == HAS_BOUNDS) { 1700 return mFocused.dispatchGenericMotionEvent(event); 1701 } 1702 return false; 1703 } 1704 1705 /** 1706 * Dispatches a generic pointer event to a child, taking into account 1707 * transformations that apply to the child. 1708 * 1709 * @param event The event to send. 1710 * @param child The view to send the event to. 1711 * @return {@code true} if the child handled the event. 1712 */ 1713 private boolean dispatchTransformedGenericPointerEvent(MotionEvent event, View child) { 1714 final float offsetX = mScrollX - child.mLeft; 1715 final float offsetY = mScrollY - child.mTop; 1716 1717 boolean handled; 1718 if (!child.hasIdentityMatrix()) { 1719 MotionEvent transformedEvent = MotionEvent.obtain(event); 1720 transformedEvent.offsetLocation(offsetX, offsetY); 1721 transformedEvent.transform(child.getInverseMatrix()); 1722 handled = child.dispatchGenericMotionEvent(transformedEvent); 1723 transformedEvent.recycle(); 1724 } else { 1725 event.offsetLocation(offsetX, offsetY); 1726 handled = child.dispatchGenericMotionEvent(event); 1727 event.offsetLocation(-offsetX, -offsetY); 1728 } 1729 return handled; 1730 } 1731 1732 /** 1733 * {@inheritDoc} 1734 */ 1735 @Override 1736 public boolean dispatchTouchEvent(MotionEvent ev) { 1737 if (mInputEventConsistencyVerifier != null) { 1738 mInputEventConsistencyVerifier.onTouchEvent(ev, 1); 1739 } 1740 1741 boolean handled = false; 1742 if (onFilterTouchEventForSecurity(ev)) { 1743 final int action = ev.getAction(); 1744 final int actionMasked = action & MotionEvent.ACTION_MASK; 1745 1746 // Handle an initial down. 1747 if (actionMasked == MotionEvent.ACTION_DOWN) { 1748 // Throw away all previous state when starting a new touch gesture. 1749 // The framework may have dropped the up or cancel event for the previous gesture 1750 // due to an app switch, ANR, or some other state change. 1751 cancelAndClearTouchTargets(ev); 1752 resetTouchState(); 1753 } 1754 1755 // Check for interception. 1756 final boolean intercepted; 1757 if (actionMasked == MotionEvent.ACTION_DOWN 1758 || mFirstTouchTarget != null) { 1759 final boolean disallowIntercept = (mGroupFlags & FLAG_DISALLOW_INTERCEPT) != 0; 1760 if (!disallowIntercept) { 1761 intercepted = onInterceptTouchEvent(ev); 1762 ev.setAction(action); // restore action in case it was changed 1763 } else { 1764 intercepted = false; 1765 } 1766 } else { 1767 // There are no touch targets and this action is not an initial down 1768 // so this view group continues to intercept touches. 1769 intercepted = true; 1770 } 1771 1772 // Check for cancelation. 1773 final boolean canceled = resetCancelNextUpFlag(this) 1774 || actionMasked == MotionEvent.ACTION_CANCEL; 1775 1776 // Update list of touch targets for pointer down, if needed. 1777 final boolean split = (mGroupFlags & FLAG_SPLIT_MOTION_EVENTS) != 0; 1778 TouchTarget newTouchTarget = null; 1779 boolean alreadyDispatchedToNewTouchTarget = false; 1780 if (!canceled && !intercepted) { 1781 if (actionMasked == MotionEvent.ACTION_DOWN 1782 || (split && actionMasked == MotionEvent.ACTION_POINTER_DOWN) 1783 || actionMasked == MotionEvent.ACTION_HOVER_MOVE) { 1784 final int actionIndex = ev.getActionIndex(); // always 0 for down 1785 final int idBitsToAssign = split ? 1 << ev.getPointerId(actionIndex) 1786 : TouchTarget.ALL_POINTER_IDS; 1787 1788 // Clean up earlier touch targets for this pointer id in case they 1789 // have become out of sync. 1790 removePointersFromTouchTargets(idBitsToAssign); 1791 1792 final int childrenCount = mChildrenCount; 1793 if (childrenCount != 0) { 1794 // Find a child that can receive the event. 1795 // Scan children from front to back. 1796 final View[] children = mChildren; 1797 final float x = ev.getX(actionIndex); 1798 final float y = ev.getY(actionIndex); 1799 1800 for (int i = childrenCount - 1; i >= 0; i--) { 1801 final View child = children[i]; 1802 if (!canViewReceivePointerEvents(child) 1803 || !isTransformedTouchPointInView(x, y, child, null)) { 1804 continue; 1805 } 1806 1807 newTouchTarget = getTouchTarget(child); 1808 if (newTouchTarget != null) { 1809 // Child is already receiving touch within its bounds. 1810 // Give it the new pointer in addition to the ones it is handling. 1811 newTouchTarget.pointerIdBits |= idBitsToAssign; 1812 break; 1813 } 1814 1815 resetCancelNextUpFlag(child); 1816 if (dispatchTransformedTouchEvent(ev, false, child, idBitsToAssign)) { 1817 // Child wants to receive touch within its bounds. 1818 mLastTouchDownTime = ev.getDownTime(); 1819 mLastTouchDownIndex = i; 1820 mLastTouchDownX = ev.getX(); 1821 mLastTouchDownY = ev.getY(); 1822 newTouchTarget = addTouchTarget(child, idBitsToAssign); 1823 alreadyDispatchedToNewTouchTarget = true; 1824 break; 1825 } 1826 } 1827 } 1828 1829 if (newTouchTarget == null && mFirstTouchTarget != null) { 1830 // Did not find a child to receive the event. 1831 // Assign the pointer to the least recently added target. 1832 newTouchTarget = mFirstTouchTarget; 1833 while (newTouchTarget.next != null) { 1834 newTouchTarget = newTouchTarget.next; 1835 } 1836 newTouchTarget.pointerIdBits |= idBitsToAssign; 1837 } 1838 } 1839 } 1840 1841 // Dispatch to touch targets. 1842 if (mFirstTouchTarget == null) { 1843 // No touch targets so treat this as an ordinary view. 1844 handled = dispatchTransformedTouchEvent(ev, canceled, null, 1845 TouchTarget.ALL_POINTER_IDS); 1846 } else { 1847 // Dispatch to touch targets, excluding the new touch target if we already 1848 // dispatched to it. Cancel touch targets if necessary. 1849 TouchTarget predecessor = null; 1850 TouchTarget target = mFirstTouchTarget; 1851 while (target != null) { 1852 final TouchTarget next = target.next; 1853 if (alreadyDispatchedToNewTouchTarget && target == newTouchTarget) { 1854 handled = true; 1855 } else { 1856 final boolean cancelChild = resetCancelNextUpFlag(target.child) 1857 || intercepted; 1858 if (dispatchTransformedTouchEvent(ev, cancelChild, 1859 target.child, target.pointerIdBits)) { 1860 handled = true; 1861 } 1862 if (cancelChild) { 1863 if (predecessor == null) { 1864 mFirstTouchTarget = next; 1865 } else { 1866 predecessor.next = next; 1867 } 1868 target.recycle(); 1869 target = next; 1870 continue; 1871 } 1872 } 1873 predecessor = target; 1874 target = next; 1875 } 1876 } 1877 1878 // Update list of touch targets for pointer up or cancel, if needed. 1879 if (canceled 1880 || actionMasked == MotionEvent.ACTION_UP 1881 || actionMasked == MotionEvent.ACTION_HOVER_MOVE) { 1882 resetTouchState(); 1883 } else if (split && actionMasked == MotionEvent.ACTION_POINTER_UP) { 1884 final int actionIndex = ev.getActionIndex(); 1885 final int idBitsToRemove = 1 << ev.getPointerId(actionIndex); 1886 removePointersFromTouchTargets(idBitsToRemove); 1887 } 1888 } 1889 1890 if (!handled && mInputEventConsistencyVerifier != null) { 1891 mInputEventConsistencyVerifier.onUnhandledEvent(ev, 1); 1892 } 1893 return handled; 1894 } 1895 1896 /** 1897 * Resets all touch state in preparation for a new cycle. 1898 */ 1899 private void resetTouchState() { 1900 clearTouchTargets(); 1901 resetCancelNextUpFlag(this); 1902 mGroupFlags &= ~FLAG_DISALLOW_INTERCEPT; 1903 } 1904 1905 /** 1906 * Resets the cancel next up flag. 1907 * Returns true if the flag was previously set. 1908 */ 1909 private static boolean resetCancelNextUpFlag(View view) { 1910 if ((view.mPrivateFlags & CANCEL_NEXT_UP_EVENT) != 0) { 1911 view.mPrivateFlags &= ~CANCEL_NEXT_UP_EVENT; 1912 return true; 1913 } 1914 return false; 1915 } 1916 1917 /** 1918 * Clears all touch targets. 1919 */ 1920 private void clearTouchTargets() { 1921 TouchTarget target = mFirstTouchTarget; 1922 if (target != null) { 1923 do { 1924 TouchTarget next = target.next; 1925 target.recycle(); 1926 target = next; 1927 } while (target != null); 1928 mFirstTouchTarget = null; 1929 } 1930 } 1931 1932 /** 1933 * Cancels and clears all touch targets. 1934 */ 1935 private void cancelAndClearTouchTargets(MotionEvent event) { 1936 if (mFirstTouchTarget != null) { 1937 boolean syntheticEvent = false; 1938 if (event == null) { 1939 final long now = SystemClock.uptimeMillis(); 1940 event = MotionEvent.obtain(now, now, 1941 MotionEvent.ACTION_CANCEL, 0.0f, 0.0f, 0); 1942 event.setSource(InputDevice.SOURCE_TOUCHSCREEN); 1943 syntheticEvent = true; 1944 } 1945 1946 for (TouchTarget target = mFirstTouchTarget; target != null; target = target.next) { 1947 resetCancelNextUpFlag(target.child); 1948 dispatchTransformedTouchEvent(event, true, target.child, target.pointerIdBits); 1949 } 1950 clearTouchTargets(); 1951 1952 if (syntheticEvent) { 1953 event.recycle(); 1954 } 1955 } 1956 } 1957 1958 /** 1959 * Gets the touch target for specified child view. 1960 * Returns null if not found. 1961 */ 1962 private TouchTarget getTouchTarget(View child) { 1963 for (TouchTarget target = mFirstTouchTarget; target != null; target = target.next) { 1964 if (target.child == child) { 1965 return target; 1966 } 1967 } 1968 return null; 1969 } 1970 1971 /** 1972 * Adds a touch target for specified child to the beginning of the list. 1973 * Assumes the target child is not already present. 1974 */ 1975 private TouchTarget addTouchTarget(View child, int pointerIdBits) { 1976 TouchTarget target = TouchTarget.obtain(child, pointerIdBits); 1977 target.next = mFirstTouchTarget; 1978 mFirstTouchTarget = target; 1979 return target; 1980 } 1981 1982 /** 1983 * Removes the pointer ids from consideration. 1984 */ 1985 private void removePointersFromTouchTargets(int pointerIdBits) { 1986 TouchTarget predecessor = null; 1987 TouchTarget target = mFirstTouchTarget; 1988 while (target != null) { 1989 final TouchTarget next = target.next; 1990 if ((target.pointerIdBits & pointerIdBits) != 0) { 1991 target.pointerIdBits &= ~pointerIdBits; 1992 if (target.pointerIdBits == 0) { 1993 if (predecessor == null) { 1994 mFirstTouchTarget = next; 1995 } else { 1996 predecessor.next = next; 1997 } 1998 target.recycle(); 1999 target = next; 2000 continue; 2001 } 2002 } 2003 predecessor = target; 2004 target = next; 2005 } 2006 } 2007 2008 /** 2009 * Returns true if a child view can receive pointer events. 2010 * @hide 2011 */ 2012 private static boolean canViewReceivePointerEvents(View child) { 2013 return (child.mViewFlags & VISIBILITY_MASK) == VISIBLE 2014 || child.getAnimation() != null; 2015 } 2016 2017 /** 2018 * Returns true if a child view contains the specified point when transformed 2019 * into its coordinate space. 2020 * Child must not be null. 2021 * @hide 2022 */ 2023 protected boolean isTransformedTouchPointInView(float x, float y, View child, 2024 PointF outLocalPoint) { 2025 float localX = x + mScrollX - child.mLeft; 2026 float localY = y + mScrollY - child.mTop; 2027 if (! child.hasIdentityMatrix() && mAttachInfo != null) { 2028 final float[] localXY = mAttachInfo.mTmpTransformLocation; 2029 localXY[0] = localX; 2030 localXY[1] = localY; 2031 child.getInverseMatrix().mapPoints(localXY); 2032 localX = localXY[0]; 2033 localY = localXY[1]; 2034 } 2035 final boolean isInView = child.pointInView(localX, localY); 2036 if (isInView && outLocalPoint != null) { 2037 outLocalPoint.set(localX, localY); 2038 } 2039 return isInView; 2040 } 2041 2042 /** 2043 * Transforms a motion event into the coordinate space of a particular child view, 2044 * filters out irrelevant pointer ids, and overrides its action if necessary. 2045 * If child is null, assumes the MotionEvent will be sent to this ViewGroup instead. 2046 */ 2047 private boolean dispatchTransformedTouchEvent(MotionEvent event, boolean cancel, 2048 View child, int desiredPointerIdBits) { 2049 final boolean handled; 2050 2051 // Canceling motions is a special case. We don't need to perform any transformations 2052 // or filtering. The important part is the action, not the contents. 2053 final int oldAction = event.getAction(); 2054 if (cancel || oldAction == MotionEvent.ACTION_CANCEL) { 2055 event.setAction(MotionEvent.ACTION_CANCEL); 2056 if (child == null) { 2057 handled = super.dispatchTouchEvent(event); 2058 } else { 2059 handled = child.dispatchTouchEvent(event); 2060 } 2061 event.setAction(oldAction); 2062 return handled; 2063 } 2064 2065 // Calculate the number of pointers to deliver. 2066 final int oldPointerIdBits = event.getPointerIdBits(); 2067 final int newPointerIdBits = oldPointerIdBits & desiredPointerIdBits; 2068 2069 // If for some reason we ended up in an inconsistent state where it looks like we 2070 // might produce a motion event with no pointers in it, then drop the event. 2071 if (newPointerIdBits == 0) { 2072 return false; 2073 } 2074 2075 // If the number of pointers is the same and we don't need to perform any fancy 2076 // irreversible transformations, then we can reuse the motion event for this 2077 // dispatch as long as we are careful to revert any changes we make. 2078 // Otherwise we need to make a copy. 2079 final MotionEvent transformedEvent; 2080 if (newPointerIdBits == oldPointerIdBits) { 2081 if (child == null || child.hasIdentityMatrix()) { 2082 if (child == null) { 2083 handled = super.dispatchTouchEvent(event); 2084 } else { 2085 final float offsetX = mScrollX - child.mLeft; 2086 final float offsetY = mScrollY - child.mTop; 2087 event.offsetLocation(offsetX, offsetY); 2088 2089 handled = child.dispatchTouchEvent(event); 2090 2091 event.offsetLocation(-offsetX, -offsetY); 2092 } 2093 return handled; 2094 } 2095 transformedEvent = MotionEvent.obtain(event); 2096 } else { 2097 transformedEvent = event.split(newPointerIdBits); 2098 } 2099 2100 // Perform any necessary transformations and dispatch. 2101 if (child == null) { 2102 handled = super.dispatchTouchEvent(transformedEvent); 2103 } else { 2104 final float offsetX = mScrollX - child.mLeft; 2105 final float offsetY = mScrollY - child.mTop; 2106 transformedEvent.offsetLocation(offsetX, offsetY); 2107 if (! child.hasIdentityMatrix()) { 2108 transformedEvent.transform(child.getInverseMatrix()); 2109 } 2110 2111 handled = child.dispatchTouchEvent(transformedEvent); 2112 } 2113 2114 // Done. 2115 transformedEvent.recycle(); 2116 return handled; 2117 } 2118 2119 /** 2120 * Enable or disable the splitting of MotionEvents to multiple children during touch event 2121 * dispatch. This behavior is enabled by default for applications that target an 2122 * SDK version of {@link Build.VERSION_CODES#HONEYCOMB} or newer. 2123 * 2124 * <p>When this option is enabled MotionEvents may be split and dispatched to different child 2125 * views depending on where each pointer initially went down. This allows for user interactions 2126 * such as scrolling two panes of content independently, chording of buttons, and performing 2127 * independent gestures on different pieces of content. 2128 * 2129 * @param split <code>true</code> to allow MotionEvents to be split and dispatched to multiple 2130 * child views. <code>false</code> to only allow one child view to be the target of 2131 * any MotionEvent received by this ViewGroup. 2132 */ 2133 public void setMotionEventSplittingEnabled(boolean split) { 2134 // TODO Applications really shouldn't change this setting mid-touch event, 2135 // but perhaps this should handle that case and send ACTION_CANCELs to any child views 2136 // with gestures in progress when this is changed. 2137 if (split) { 2138 mGroupFlags |= FLAG_SPLIT_MOTION_EVENTS; 2139 } else { 2140 mGroupFlags &= ~FLAG_SPLIT_MOTION_EVENTS; 2141 } 2142 } 2143 2144 /** 2145 * Returns true if MotionEvents dispatched to this ViewGroup can be split to multiple children. 2146 * @return true if MotionEvents dispatched to this ViewGroup can be split to multiple children. 2147 */ 2148 public boolean isMotionEventSplittingEnabled() { 2149 return (mGroupFlags & FLAG_SPLIT_MOTION_EVENTS) == FLAG_SPLIT_MOTION_EVENTS; 2150 } 2151 2152 /** 2153 * {@inheritDoc} 2154 */ 2155 public void requestDisallowInterceptTouchEvent(boolean disallowIntercept) { 2156 2157 if (disallowIntercept == ((mGroupFlags & FLAG_DISALLOW_INTERCEPT) != 0)) { 2158 // We're already in this state, assume our ancestors are too 2159 return; 2160 } 2161 2162 if (disallowIntercept) { 2163 mGroupFlags |= FLAG_DISALLOW_INTERCEPT; 2164 } else { 2165 mGroupFlags &= ~FLAG_DISALLOW_INTERCEPT; 2166 } 2167 2168 // Pass it up to our parent 2169 if (mParent != null) { 2170 mParent.requestDisallowInterceptTouchEvent(disallowIntercept); 2171 } 2172 } 2173 2174 /** 2175 * Implement this method to intercept all touch screen motion events. This 2176 * allows you to watch events as they are dispatched to your children, and 2177 * take ownership of the current gesture at any point. 2178 * 2179 * <p>Using this function takes some care, as it has a fairly complicated 2180 * interaction with {@link View#onTouchEvent(MotionEvent) 2181 * View.onTouchEvent(MotionEvent)}, and using it requires implementing 2182 * that method as well as this one in the correct way. Events will be 2183 * received in the following order: 2184 * 2185 * <ol> 2186 * <li> You will receive the down event here. 2187 * <li> The down event will be handled either by a child of this view 2188 * group, or given to your own onTouchEvent() method to handle; this means 2189 * you should implement onTouchEvent() to return true, so you will 2190 * continue to see the rest of the gesture (instead of looking for 2191 * a parent view to handle it). Also, by returning true from 2192 * onTouchEvent(), you will not receive any following 2193 * events in onInterceptTouchEvent() and all touch processing must 2194 * happen in onTouchEvent() like normal. 2195 * <li> For as long as you return false from this function, each following 2196 * event (up to and including the final up) will be delivered first here 2197 * and then to the target's onTouchEvent(). 2198 * <li> If you return true from here, you will not receive any 2199 * following events: the target view will receive the same event but 2200 * with the action {@link MotionEvent#ACTION_CANCEL}, and all further 2201 * events will be delivered to your onTouchEvent() method and no longer 2202 * appear here. 2203 * </ol> 2204 * 2205 * @param ev The motion event being dispatched down the hierarchy. 2206 * @return Return true to steal motion events from the children and have 2207 * them dispatched to this ViewGroup through onTouchEvent(). 2208 * The current target will receive an ACTION_CANCEL event, and no further 2209 * messages will be delivered here. 2210 */ 2211 public boolean onInterceptTouchEvent(MotionEvent ev) { 2212 return false; 2213 } 2214 2215 /** 2216 * {@inheritDoc} 2217 * 2218 * Looks for a view to give focus to respecting the setting specified by 2219 * {@link #getDescendantFocusability()}. 2220 * 2221 * Uses {@link #onRequestFocusInDescendants(int, android.graphics.Rect)} to 2222 * find focus within the children of this group when appropriate. 2223 * 2224 * @see #FOCUS_BEFORE_DESCENDANTS 2225 * @see #FOCUS_AFTER_DESCENDANTS 2226 * @see #FOCUS_BLOCK_DESCENDANTS 2227 * @see #onRequestFocusInDescendants(int, android.graphics.Rect) 2228 */ 2229 @Override 2230 public boolean requestFocus(int direction, Rect previouslyFocusedRect) { 2231 if (DBG) { 2232 System.out.println(this + " ViewGroup.requestFocus direction=" 2233 + direction); 2234 } 2235 int descendantFocusability = getDescendantFocusability(); 2236 2237 switch (descendantFocusability) { 2238 case FOCUS_BLOCK_DESCENDANTS: 2239 return super.requestFocus(direction, previouslyFocusedRect); 2240 case FOCUS_BEFORE_DESCENDANTS: { 2241 final boolean took = super.requestFocus(direction, previouslyFocusedRect); 2242 return took ? took : onRequestFocusInDescendants(direction, previouslyFocusedRect); 2243 } 2244 case FOCUS_AFTER_DESCENDANTS: { 2245 final boolean took = onRequestFocusInDescendants(direction, previouslyFocusedRect); 2246 return took ? took : super.requestFocus(direction, previouslyFocusedRect); 2247 } 2248 default: 2249 throw new IllegalStateException("descendant focusability must be " 2250 + "one of FOCUS_BEFORE_DESCENDANTS, FOCUS_AFTER_DESCENDANTS, FOCUS_BLOCK_DESCENDANTS " 2251 + "but is " + descendantFocusability); 2252 } 2253 } 2254 2255 /** 2256 * Look for a descendant to call {@link View#requestFocus} on. 2257 * Called by {@link ViewGroup#requestFocus(int, android.graphics.Rect)} 2258 * when it wants to request focus within its children. Override this to 2259 * customize how your {@link ViewGroup} requests focus within its children. 2260 * @param direction One of FOCUS_UP, FOCUS_DOWN, FOCUS_LEFT, and FOCUS_RIGHT 2261 * @param previouslyFocusedRect The rectangle (in this View's coordinate system) 2262 * to give a finer grained hint about where focus is coming from. May be null 2263 * if there is no hint. 2264 * @return Whether focus was taken. 2265 */ 2266 @SuppressWarnings({"ConstantConditions"}) 2267 protected boolean onRequestFocusInDescendants(int direction, 2268 Rect previouslyFocusedRect) { 2269 int index; 2270 int increment; 2271 int end; 2272 int count = mChildrenCount; 2273 if ((direction & FOCUS_FORWARD) != 0) { 2274 index = 0; 2275 increment = 1; 2276 end = count; 2277 } else { 2278 index = count - 1; 2279 increment = -1; 2280 end = -1; 2281 } 2282 final View[] children = mChildren; 2283 for (int i = index; i != end; i += increment) { 2284 View child = children[i]; 2285 if ((child.mViewFlags & VISIBILITY_MASK) == VISIBLE) { 2286 if (child.requestFocus(direction, previouslyFocusedRect)) { 2287 return true; 2288 } 2289 } 2290 } 2291 return false; 2292 } 2293 2294 /** 2295 * {@inheritDoc} 2296 * 2297 * @hide 2298 */ 2299 @Override 2300 public void dispatchStartTemporaryDetach() { 2301 super.dispatchStartTemporaryDetach(); 2302 final int count = mChildrenCount; 2303 final View[] children = mChildren; 2304 for (int i = 0; i < count; i++) { 2305 children[i].dispatchStartTemporaryDetach(); 2306 } 2307 } 2308 2309 /** 2310 * {@inheritDoc} 2311 * 2312 * @hide 2313 */ 2314 @Override 2315 public void dispatchFinishTemporaryDetach() { 2316 super.dispatchFinishTemporaryDetach(); 2317 final int count = mChildrenCount; 2318 final View[] children = mChildren; 2319 for (int i = 0; i < count; i++) { 2320 children[i].dispatchFinishTemporaryDetach(); 2321 } 2322 } 2323 2324 /** 2325 * {@inheritDoc} 2326 */ 2327 @Override 2328 void dispatchAttachedToWindow(AttachInfo info, int visibility) { 2329 mGroupFlags |= FLAG_PREVENT_DISPATCH_ATTACHED_TO_WINDOW; 2330 super.dispatchAttachedToWindow(info, visibility); 2331 mGroupFlags &= ~FLAG_PREVENT_DISPATCH_ATTACHED_TO_WINDOW; 2332 2333 final int count = mChildrenCount; 2334 final View[] children = mChildren; 2335 for (int i = 0; i < count; i++) { 2336 final View child = children[i]; 2337 child.dispatchAttachedToWindow(info, 2338 visibility | (child.mViewFlags&VISIBILITY_MASK)); 2339 } 2340 } 2341 2342 @Override 2343 void dispatchScreenStateChanged(int screenState) { 2344 super.dispatchScreenStateChanged(screenState); 2345 2346 final int count = mChildrenCount; 2347 final View[] children = mChildren; 2348 for (int i = 0; i < count; i++) { 2349 children[i].dispatchScreenStateChanged(screenState); 2350 } 2351 } 2352 2353 @Override 2354 boolean dispatchPopulateAccessibilityEventInternal(AccessibilityEvent event) { 2355 boolean handled = false; 2356 if (includeForAccessibility()) { 2357 handled = super.dispatchPopulateAccessibilityEventInternal(event); 2358 if (handled) { 2359 return handled; 2360 } 2361 } 2362 // Let our children have a shot in populating the event. 2363 ChildListForAccessibility children = ChildListForAccessibility.obtain(this, true); 2364 final int childCount = children.getChildCount(); 2365 for (int i = 0; i < childCount; i++) { 2366 View child = children.getChildAt(i); 2367 if ((child.mViewFlags & VISIBILITY_MASK) == VISIBLE) { 2368 handled = child.dispatchPopulateAccessibilityEvent(event); 2369 if (handled) { 2370 children.recycle(); 2371 return handled; 2372 } 2373 } 2374 } 2375 children.recycle(); 2376 return false; 2377 } 2378 2379 @Override 2380 void onInitializeAccessibilityNodeInfoInternal(AccessibilityNodeInfo info) { 2381 super.onInitializeAccessibilityNodeInfoInternal(info); 2382 if (mAttachInfo != null) { 2383 ArrayList<View> childrenForAccessibility = mAttachInfo.mTempArrayList; 2384 childrenForAccessibility.clear(); 2385 addChildrenForAccessibility(childrenForAccessibility); 2386 final int childrenForAccessibilityCount = childrenForAccessibility.size(); 2387 for (int i = 0; i < childrenForAccessibilityCount; i++) { 2388 View child = childrenForAccessibility.get(i); 2389 info.addChild(child); 2390 } 2391 childrenForAccessibility.clear(); 2392 } 2393 } 2394 2395 @Override 2396 void onInitializeAccessibilityEventInternal(AccessibilityEvent event) { 2397 super.onInitializeAccessibilityEventInternal(event); 2398 event.setClassName(ViewGroup.class.getName()); 2399 } 2400 2401 /** 2402 * @hide 2403 */ 2404 @Override 2405 public void resetAccessibilityStateChanged() { 2406 super.resetAccessibilityStateChanged(); 2407 View[] children = mChildren; 2408 final int childCount = mChildrenCount; 2409 for (int i = 0; i < childCount; i++) { 2410 View child = children[i]; 2411 child.resetAccessibilityStateChanged(); 2412 } 2413 } 2414 2415 /** 2416 * {@inheritDoc} 2417 */ 2418 @Override 2419 void dispatchDetachedFromWindow() { 2420 // If we still have a touch target, we are still in the process of 2421 // dispatching motion events to a child; we need to get rid of that 2422 // child to avoid dispatching events to it after the window is torn 2423 // down. To make sure we keep the child in a consistent state, we 2424 // first send it an ACTION_CANCEL motion event. 2425 cancelAndClearTouchTargets(null); 2426 2427 // In case view is detached while transition is running 2428 mLayoutSuppressed = false; 2429 2430 // Tear down our drag tracking 2431 mDragNotifiedChildren = null; 2432 if (mCurrentDrag != null) { 2433 mCurrentDrag.recycle(); 2434 mCurrentDrag = null; 2435 } 2436 2437 final int count = mChildrenCount; 2438 final View[] children = mChildren; 2439 for (int i = 0; i < count; i++) { 2440 children[i].dispatchDetachedFromWindow(); 2441 } 2442 super.dispatchDetachedFromWindow(); 2443 } 2444 2445 /** 2446 * {@inheritDoc} 2447 */ 2448 @Override 2449 public void setPadding(int left, int top, int right, int bottom) { 2450 super.setPadding(left, top, right, bottom); 2451 2452 if ((mPaddingLeft | mPaddingTop | mPaddingRight | mPaddingBottom) != 0) { 2453 mGroupFlags |= FLAG_PADDING_NOT_NULL; 2454 } else { 2455 mGroupFlags &= ~FLAG_PADDING_NOT_NULL; 2456 } 2457 } 2458 2459 /** 2460 * {@inheritDoc} 2461 */ 2462 @Override 2463 protected void dispatchSaveInstanceState(SparseArray<Parcelable> container) { 2464 super.dispatchSaveInstanceState(container); 2465 final int count = mChildrenCount; 2466 final View[] children = mChildren; 2467 for (int i = 0; i < count; i++) { 2468 View c = children[i]; 2469 if ((c.mViewFlags & PARENT_SAVE_DISABLED_MASK) != PARENT_SAVE_DISABLED) { 2470 c.dispatchSaveInstanceState(container); 2471 } 2472 } 2473 } 2474 2475 /** 2476 * Perform dispatching of a {@link #saveHierarchyState(android.util.SparseArray)} freeze()} 2477 * to only this view, not to its children. For use when overriding 2478 * {@link #dispatchSaveInstanceState(android.util.SparseArray)} dispatchFreeze()} to allow 2479 * subclasses to freeze their own state but not the state of their children. 2480 * 2481 * @param container the container 2482 */ 2483 protected void dispatchFreezeSelfOnly(SparseArray<Parcelable> container) { 2484 super.dispatchSaveInstanceState(container); 2485 } 2486 2487 /** 2488 * {@inheritDoc} 2489 */ 2490 @Override 2491 protected void dispatchRestoreInstanceState(SparseArray<Parcelable> container) { 2492 super.dispatchRestoreInstanceState(container); 2493 final int count = mChildrenCount; 2494 final View[] children = mChildren; 2495 for (int i = 0; i < count; i++) { 2496 View c = children[i]; 2497 if ((c.mViewFlags & PARENT_SAVE_DISABLED_MASK) != PARENT_SAVE_DISABLED) { 2498 c.dispatchRestoreInstanceState(container); 2499 } 2500 } 2501 } 2502 2503 /** 2504 * Perform dispatching of a {@link #restoreHierarchyState(android.util.SparseArray)} 2505 * to only this view, not to its children. For use when overriding 2506 * {@link #dispatchRestoreInstanceState(android.util.SparseArray)} to allow 2507 * subclasses to thaw their own state but not the state of their children. 2508 * 2509 * @param container the container 2510 */ 2511 protected void dispatchThawSelfOnly(SparseArray<Parcelable> container) { 2512 super.dispatchRestoreInstanceState(container); 2513 } 2514 2515 /** 2516 * Enables or disables the drawing cache for each child of this view group. 2517 * 2518 * @param enabled true to enable the cache, false to dispose of it 2519 */ 2520 protected void setChildrenDrawingCacheEnabled(boolean enabled) { 2521 if (enabled || (mPersistentDrawingCache & PERSISTENT_ALL_CACHES) != PERSISTENT_ALL_CACHES) { 2522 final View[] children = mChildren; 2523 final int count = mChildrenCount; 2524 for (int i = 0; i < count; i++) { 2525 children[i].setDrawingCacheEnabled(enabled); 2526 } 2527 } 2528 } 2529 2530 @Override 2531 protected void onAnimationStart() { 2532 super.onAnimationStart(); 2533 2534 // When this ViewGroup's animation starts, build the cache for the children 2535 if ((mGroupFlags & FLAG_ANIMATION_CACHE) == FLAG_ANIMATION_CACHE) { 2536 final int count = mChildrenCount; 2537 final View[] children = mChildren; 2538 final boolean buildCache = !isHardwareAccelerated(); 2539 2540 for (int i = 0; i < count; i++) { 2541 final View child = children[i]; 2542 if ((child.mViewFlags & VISIBILITY_MASK) == VISIBLE) { 2543 child.setDrawingCacheEnabled(true); 2544 if (buildCache) { 2545 child.buildDrawingCache(true); 2546 } 2547 } 2548 } 2549 2550 mGroupFlags |= FLAG_CHILDREN_DRAWN_WITH_CACHE; 2551 } 2552 } 2553 2554 @Override 2555 protected void onAnimationEnd() { 2556 super.onAnimationEnd(); 2557 2558 // When this ViewGroup's animation ends, destroy the cache of the children 2559 if ((mGroupFlags & FLAG_ANIMATION_CACHE) == FLAG_ANIMATION_CACHE) { 2560 mGroupFlags &= ~FLAG_CHILDREN_DRAWN_WITH_CACHE; 2561 2562 if ((mPersistentDrawingCache & PERSISTENT_ANIMATION_CACHE) == 0) { 2563 setChildrenDrawingCacheEnabled(false); 2564 } 2565 } 2566 } 2567 2568 @Override 2569 Bitmap createSnapshot(Bitmap.Config quality, int backgroundColor, boolean skipChildren) { 2570 int count = mChildrenCount; 2571 int[] visibilities = null; 2572 2573 if (skipChildren) { 2574 visibilities = new int[count]; 2575 for (int i = 0; i < count; i++) { 2576 View child = getChildAt(i); 2577 visibilities[i] = child.getVisibility(); 2578 if (visibilities[i] == View.VISIBLE) { 2579 child.setVisibility(INVISIBLE); 2580 } 2581 } 2582 } 2583 2584 Bitmap b = super.createSnapshot(quality, backgroundColor, skipChildren); 2585 2586 if (skipChildren) { 2587 for (int i = 0; i < count; i++) { 2588 getChildAt(i).setVisibility(visibilities[i]); 2589 } 2590 } 2591 2592 return b; 2593 } 2594 2595 private static void drawRect(Canvas canvas, int x1, int y1, int x2, int y2, Paint paint) { 2596 canvas.drawRect(x1, y1, x2 - 1, y2 - 1, paint); 2597 } 2598 2599 /** 2600 * @hide 2601 */ 2602 protected void onDebugDrawMargins(Canvas canvas) { 2603 for (int i = 0; i < getChildCount(); i++) { 2604 View c = getChildAt(i); 2605 c.getLayoutParams().onDebugDraw(this, canvas); 2606 } 2607 } 2608 2609 /** 2610 * @hide 2611 */ 2612 protected void onDebugDraw(Canvas canvas) { 2613 Paint paint = new Paint(); 2614 paint.setStyle(Paint.Style.STROKE); 2615 2616 // Draw optical bounds 2617 if (getLayoutMode() == LAYOUT_BOUNDS) { 2618 paint.setColor(Color.RED); 2619 for (int i = 0; i < getChildCount(); i++) { 2620 View c = getChildAt(i); 2621 Insets insets = c.getLayoutInsets(); 2622 drawRect(canvas, 2623 c.getLeft() + insets.left, 2624 c.getTop() + insets.top, 2625 c.getRight() - insets.right, 2626 c.getBottom() - insets.bottom, paint); 2627 } 2628 } 2629 2630 // Draw bounds 2631 paint.setColor(Color.BLUE); 2632 for (int i = 0; i < getChildCount(); i++) { 2633 View c = getChildAt(i); 2634 drawRect(canvas, c.getLeft(), c.getTop(), c.getRight(), c.getBottom(), paint); 2635 } 2636 2637 // Draw margins 2638 onDebugDrawMargins(canvas); 2639 } 2640 2641 /** 2642 * {@inheritDoc} 2643 */ 2644 @Override 2645 protected void dispatchDraw(Canvas canvas) { 2646 final int count = mChildrenCount; 2647 final View[] children = mChildren; 2648 int flags = mGroupFlags; 2649 2650 if ((flags & FLAG_RUN_ANIMATION) != 0 && canAnimate()) { 2651 final boolean cache = (mGroupFlags & FLAG_ANIMATION_CACHE) == FLAG_ANIMATION_CACHE; 2652 2653 final boolean buildCache = !isHardwareAccelerated(); 2654 for (int i = 0; i < count; i++) { 2655 final View child = children[i]; 2656 if ((child.mViewFlags & VISIBILITY_MASK) == VISIBLE) { 2657 final LayoutParams params = child.getLayoutParams(); 2658 attachLayoutAnimationParameters(child, params, i, count); 2659 bindLayoutAnimation(child); 2660 if (cache) { 2661 child.setDrawingCacheEnabled(true); 2662 if (buildCache) { 2663 child.buildDrawingCache(true); 2664 } 2665 } 2666 } 2667 } 2668 2669 final LayoutAnimationController controller = mLayoutAnimationController; 2670 if (controller.willOverlap()) { 2671 mGroupFlags |= FLAG_OPTIMIZE_INVALIDATE; 2672 } 2673 2674 controller.start(); 2675 2676 mGroupFlags &= ~FLAG_RUN_ANIMATION; 2677 mGroupFlags &= ~FLAG_ANIMATION_DONE; 2678 2679 if (cache) { 2680 mGroupFlags |= FLAG_CHILDREN_DRAWN_WITH_CACHE; 2681 } 2682 2683 if (mAnimationListener != null) { 2684 mAnimationListener.onAnimationStart(controller.getAnimation()); 2685 } 2686 } 2687 2688 int saveCount = 0; 2689 final boolean clipToPadding = (flags & CLIP_TO_PADDING_MASK) == CLIP_TO_PADDING_MASK; 2690 if (clipToPadding) { 2691 saveCount = canvas.save(); 2692 canvas.clipRect(mScrollX + mPaddingLeft, mScrollY + mPaddingTop, 2693 mScrollX + mRight - mLeft - mPaddingRight, 2694 mScrollY + mBottom - mTop - mPaddingBottom); 2695 2696 } 2697 2698 // We will draw our child's animation, let's reset the flag 2699 mPrivateFlags &= ~DRAW_ANIMATION; 2700 mGroupFlags &= ~FLAG_INVALIDATE_REQUIRED; 2701 2702 boolean more = false; 2703 final long drawingTime = getDrawingTime(); 2704 2705 if ((flags & FLAG_USE_CHILD_DRAWING_ORDER) == 0) { 2706 for (int i = 0; i < count; i++) { 2707 final View child = children[i]; 2708 if ((child.mViewFlags & VISIBILITY_MASK) == VISIBLE || child.getAnimation() != null) { 2709 more |= drawChild(canvas, child, drawingTime); 2710 } 2711 } 2712 } else { 2713 for (int i = 0; i < count; i++) { 2714 final View child = children[getChildDrawingOrder(count, i)]; 2715 if ((child.mViewFlags & VISIBILITY_MASK) == VISIBLE || child.getAnimation() != null) { 2716 more |= drawChild(canvas, child, drawingTime); 2717 } 2718 } 2719 } 2720 2721 // Draw any disappearing views that have animations 2722 if (mDisappearingChildren != null) { 2723 final ArrayList<View> disappearingChildren = mDisappearingChildren; 2724 final int disappearingCount = disappearingChildren.size() - 1; 2725 // Go backwards -- we may delete as animations finish 2726 for (int i = disappearingCount; i >= 0; i--) { 2727 final View child = disappearingChildren.get(i); 2728 more |= drawChild(canvas, child, drawingTime); 2729 } 2730 } 2731 2732 if (debugDraw()) { 2733 onDebugDraw(canvas); 2734 } 2735 2736 if (clipToPadding) { 2737 canvas.restoreToCount(saveCount); 2738 } 2739 2740 // mGroupFlags might have been updated by drawChild() 2741 flags = mGroupFlags; 2742 2743 if ((flags & FLAG_INVALIDATE_REQUIRED) == FLAG_INVALIDATE_REQUIRED) { 2744 invalidate(true); 2745 } 2746 2747 if ((flags & FLAG_ANIMATION_DONE) == 0 && (flags & FLAG_NOTIFY_ANIMATION_LISTENER) == 0 && 2748 mLayoutAnimationController.isDone() && !more) { 2749 // We want to erase the drawing cache and notify the listener after the 2750 // next frame is drawn because one extra invalidate() is caused by 2751 // drawChild() after the animation is over 2752 mGroupFlags |= FLAG_NOTIFY_ANIMATION_LISTENER; 2753 final Runnable end = new Runnable() { 2754 public void run() { 2755 notifyAnimationListener(); 2756 } 2757 }; 2758 post(end); 2759 } 2760 } 2761 2762 /** 2763 * Returns the index of the child to draw for this iteration. Override this 2764 * if you want to change the drawing order of children. By default, it 2765 * returns i. 2766 * <p> 2767 * NOTE: In order for this method to be called, you must enable child ordering 2768 * first by calling {@link #setChildrenDrawingOrderEnabled(boolean)}. 2769 * 2770 * @param i The current iteration. 2771 * @return The index of the child to draw this iteration. 2772 * 2773 * @see #setChildrenDrawingOrderEnabled(boolean) 2774 * @see #isChildrenDrawingOrderEnabled() 2775 */ 2776 protected int getChildDrawingOrder(int childCount, int i) { 2777 return i; 2778 } 2779 2780 private void notifyAnimationListener() { 2781 mGroupFlags &= ~FLAG_NOTIFY_ANIMATION_LISTENER; 2782 mGroupFlags |= FLAG_ANIMATION_DONE; 2783 2784 if (mAnimationListener != null) { 2785 final Runnable end = new Runnable() { 2786 public void run() { 2787 mAnimationListener.onAnimationEnd(mLayoutAnimationController.getAnimation()); 2788 } 2789 }; 2790 post(end); 2791 } 2792 2793 if ((mGroupFlags & FLAG_ANIMATION_CACHE) == FLAG_ANIMATION_CACHE) { 2794 mGroupFlags &= ~FLAG_CHILDREN_DRAWN_WITH_CACHE; 2795 if ((mPersistentDrawingCache & PERSISTENT_ANIMATION_CACHE) == 0) { 2796 setChildrenDrawingCacheEnabled(false); 2797 } 2798 } 2799 2800 invalidate(true); 2801 } 2802 2803 /** 2804 * This method is used to cause children of this ViewGroup to restore or recreate their 2805 * display lists. It is called by getDisplayList() when the parent ViewGroup does not need 2806 * to recreate its own display list, which would happen if it went through the normal 2807 * draw/dispatchDraw mechanisms. 2808 * 2809 * @hide 2810 */ 2811 @Override 2812 protected void dispatchGetDisplayList() { 2813 final int count = mChildrenCount; 2814 final View[] children = mChildren; 2815 for (int i = 0; i < count; i++) { 2816 final View child = children[i]; 2817 if (((child.mViewFlags & VISIBILITY_MASK) == VISIBLE || child.getAnimation() != null) && 2818 child.hasStaticLayer()) { 2819 child.mRecreateDisplayList = (child.mPrivateFlags & INVALIDATED) == INVALIDATED; 2820 child.mPrivateFlags &= ~INVALIDATED; 2821 child.getDisplayList(); 2822 child.mRecreateDisplayList = false; 2823 } 2824 } 2825 } 2826 2827 /** 2828 * Draw one child of this View Group. This method is responsible for getting 2829 * the canvas in the right state. This includes clipping, translating so 2830 * that the child's scrolled origin is at 0, 0, and applying any animation 2831 * transformations. 2832 * 2833 * @param canvas The canvas on which to draw the child 2834 * @param child Who to draw 2835 * @param drawingTime The time at which draw is occurring 2836 * @return True if an invalidate() was issued 2837 */ 2838 protected boolean drawChild(Canvas canvas, View child, long drawingTime) { 2839 return child.draw(canvas, this, drawingTime); 2840 } 2841 2842 /** 2843 * 2844 * @param enabled True if children should be drawn with layers, false otherwise. 2845 * 2846 * @hide 2847 */ 2848 public void setChildrenLayersEnabled(boolean enabled) { 2849 if (enabled != mDrawLayers) { 2850 mDrawLayers = enabled; 2851 invalidate(true); 2852 2853 boolean flushLayers = !enabled; 2854 AttachInfo info = mAttachInfo; 2855 if (info != null && info.mHardwareRenderer != null && 2856 info.mHardwareRenderer.isEnabled()) { 2857 if (!info.mHardwareRenderer.validate()) { 2858 flushLayers = false; 2859 } 2860 } else { 2861 flushLayers = false; 2862 } 2863 2864 // We need to invalidate any child with a layer. For instance, 2865 // if a child is backed by a hardware layer and we disable layers 2866 // the child is marked as not dirty (flags cleared the last time 2867 // the child was drawn inside its layer.) However, that child might 2868 // never have created its own display list or have an obsolete 2869 // display list. By invalidating the child we ensure the display 2870 // list is in sync with the content of the hardware layer. 2871 for (int i = 0; i < mChildrenCount; i++) { 2872 View child = mChildren[i]; 2873 if (child.mLayerType != LAYER_TYPE_NONE) { 2874 if (flushLayers) child.flushLayer(); 2875 child.invalidate(true); 2876 } 2877 } 2878 } 2879 } 2880 2881 /** 2882 * By default, children are clipped to their bounds before drawing. This 2883 * allows view groups to override this behavior for animations, etc. 2884 * 2885 * @param clipChildren true to clip children to their bounds, 2886 * false otherwise 2887 * @attr ref android.R.styleable#ViewGroup_clipChildren 2888 */ 2889 public void setClipChildren(boolean clipChildren) { 2890 boolean previousValue = (mGroupFlags & FLAG_CLIP_CHILDREN) == FLAG_CLIP_CHILDREN; 2891 if (clipChildren != previousValue) { 2892 setBooleanFlag(FLAG_CLIP_CHILDREN, clipChildren); 2893 if (USE_DISPLAY_LIST_PROPERTIES) { 2894 for (int i = 0; i < mChildrenCount; ++i) { 2895 View child = getChildAt(i); 2896 if (child.mDisplayList != null) { 2897 child.mDisplayList.setClipChildren(clipChildren); 2898 } 2899 } 2900 } 2901 } 2902 } 2903 2904 /** 2905 * By default, children are clipped to the padding of the ViewGroup. This 2906 * allows view groups to override this behavior 2907 * 2908 * @param clipToPadding true to clip children to the padding of the 2909 * group, false otherwise 2910 * @attr ref android.R.styleable#ViewGroup_clipToPadding 2911 */ 2912 public void setClipToPadding(boolean clipToPadding) { 2913 setBooleanFlag(FLAG_CLIP_TO_PADDING, clipToPadding); 2914 } 2915 2916 /** 2917 * {@inheritDoc} 2918 */ 2919 @Override 2920 public void dispatchSetSelected(boolean selected) { 2921 final View[] children = mChildren; 2922 final int count = mChildrenCount; 2923 for (int i = 0; i < count; i++) { 2924 children[i].setSelected(selected); 2925 } 2926 } 2927 2928 /** 2929 * {@inheritDoc} 2930 */ 2931 @Override 2932 public void dispatchSetActivated(boolean activated) { 2933 final View[] children = mChildren; 2934 final int count = mChildrenCount; 2935 for (int i = 0; i < count; i++) { 2936 children[i].setActivated(activated); 2937 } 2938 } 2939 2940 @Override 2941 protected void dispatchSetPressed(boolean pressed) { 2942 final View[] children = mChildren; 2943 final int count = mChildrenCount; 2944 for (int i = 0; i < count; i++) { 2945 final View child = children[i]; 2946 // Children that are clickable on their own should not 2947 // show a pressed state when their parent view does. 2948 // Clearing a pressed state always propagates. 2949 if (!pressed || (!child.isClickable() && !child.isLongClickable())) { 2950 child.setPressed(pressed); 2951 } 2952 } 2953 } 2954 2955 /** 2956 * When this property is set to true, this ViewGroup supports static transformations on 2957 * children; this causes 2958 * {@link #getChildStaticTransformation(View, android.view.animation.Transformation)} to be 2959 * invoked when a child is drawn. 2960 * 2961 * Any subclass overriding 2962 * {@link #getChildStaticTransformation(View, android.view.animation.Transformation)} should 2963 * set this property to true. 2964 * 2965 * @param enabled True to enable static transformations on children, false otherwise. 2966 * 2967 * @see #FLAG_SUPPORT_STATIC_TRANSFORMATIONS 2968 */ 2969 protected void setStaticTransformationsEnabled(boolean enabled) { 2970 setBooleanFlag(FLAG_SUPPORT_STATIC_TRANSFORMATIONS, enabled); 2971 } 2972 2973 /** 2974 * Sets <code>t</code> to be the static transformation of the child, if set, returning a 2975 * boolean to indicate whether a static transform was set. The default implementation 2976 * simply returns <code>false</code>; subclasses may override this method for different 2977 * behavior. 2978 * 2979 * @param child The child view whose static transform is being requested 2980 * @param t The Transformation which will hold the result 2981 * @return true if the transformation was set, false otherwise 2982 * @see #setStaticTransformationsEnabled(boolean) 2983 */ 2984 protected boolean getChildStaticTransformation(View child, Transformation t) { 2985 return false; 2986 } 2987 2988 /** 2989 * {@hide} 2990 */ 2991 @Override 2992 protected View findViewTraversal(int id) { 2993 if (id == mID) { 2994 return this; 2995 } 2996 2997 final View[] where = mChildren; 2998 final int len = mChildrenCount; 2999 3000 for (int i = 0; i < len; i++) { 3001 View v = where[i]; 3002 3003 if ((v.mPrivateFlags & IS_ROOT_NAMESPACE) == 0) { 3004 v = v.findViewById(id); 3005 3006 if (v != null) { 3007 return v; 3008 } 3009 } 3010 } 3011 3012 return null; 3013 } 3014 3015 /** 3016 * {@hide} 3017 */ 3018 @Override 3019 protected View findViewWithTagTraversal(Object tag) { 3020 if (tag != null && tag.equals(mTag)) { 3021 return this; 3022 } 3023 3024 final View[] where = mChildren; 3025 final int len = mChildrenCount; 3026 3027 for (int i = 0; i < len; i++) { 3028 View v = where[i]; 3029 3030 if ((v.mPrivateFlags & IS_ROOT_NAMESPACE) == 0) { 3031 v = v.findViewWithTag(tag); 3032 3033 if (v != null) { 3034 return v; 3035 } 3036 } 3037 } 3038 3039 return null; 3040 } 3041 3042 /** 3043 * {@hide} 3044 */ 3045 @Override 3046 protected View findViewByPredicateTraversal(Predicate<View> predicate, View childToSkip) { 3047 if (predicate.apply(this)) { 3048 return this; 3049 } 3050 3051 final View[] where = mChildren; 3052 final int len = mChildrenCount; 3053 3054 for (int i = 0; i < len; i++) { 3055 View v = where[i]; 3056 3057 if (v != childToSkip && (v.mPrivateFlags & IS_ROOT_NAMESPACE) == 0) { 3058 v = v.findViewByPredicate(predicate); 3059 3060 if (v != null) { 3061 return v; 3062 } 3063 } 3064 } 3065 3066 return null; 3067 } 3068 3069 /** 3070 * Adds a child view. If no layout parameters are already set on the child, the 3071 * default parameters for this ViewGroup are set on the child. 3072 * 3073 * @param child the child view to add 3074 * 3075 * @see #generateDefaultLayoutParams() 3076 */ 3077 public void addView(View child) { 3078 addView(child, -1); 3079 } 3080 3081 /** 3082 * Adds a child view. If no layout parameters are already set on the child, the 3083 * default parameters for this ViewGroup are set on the child. 3084 * 3085 * @param child the child view to add 3086 * @param index the position at which to add the child 3087 * 3088 * @see #generateDefaultLayoutParams() 3089 */ 3090 public void addView(View child, int index) { 3091 LayoutParams params = child.getLayoutParams(); 3092 if (params == null) { 3093 params = generateDefaultLayoutParams(); 3094 if (params == null) { 3095 throw new IllegalArgumentException("generateDefaultLayoutParams() cannot return null"); 3096 } 3097 } 3098 addView(child, index, params); 3099 } 3100 3101 /** 3102 * Adds a child view with this ViewGroup's default layout parameters and the 3103 * specified width and height. 3104 * 3105 * @param child the child view to add 3106 */ 3107 public void addView(View child, int width, int height) { 3108 final LayoutParams params = generateDefaultLayoutParams(); 3109 params.width = width; 3110 params.height = height; 3111 addView(child, -1, params); 3112 } 3113 3114 /** 3115 * Adds a child view with the specified layout parameters. 3116 * 3117 * @param child the child view to add 3118 * @param params the layout parameters to set on the child 3119 */ 3120 public void addView(View child, LayoutParams params) { 3121 addView(child, -1, params); 3122 } 3123 3124 /** 3125 * Adds a child view with the specified layout parameters. 3126 * 3127 * @param child the child view to add 3128 * @param index the position at which to add the child 3129 * @param params the layout parameters to set on the child 3130 */ 3131 public void addView(View child, int index, LayoutParams params) { 3132 if (DBG) { 3133 System.out.println(this + " addView"); 3134 } 3135 3136 // addViewInner() will call child.requestLayout() when setting the new LayoutParams 3137 // therefore, we call requestLayout() on ourselves before, so that the child's request 3138 // will be blocked at our level 3139 requestLayout(); 3140 invalidate(true); 3141 addViewInner(child, index, params, false); 3142 } 3143 3144 /** 3145 * {@inheritDoc} 3146 */ 3147 public void updateViewLayout(View view, ViewGroup.LayoutParams params) { 3148 if (!checkLayoutParams(params)) { 3149 throw new IllegalArgumentException("Invalid LayoutParams supplied to " + this); 3150 } 3151 if (view.mParent != this) { 3152 throw new IllegalArgumentException("Given view not a child of " + this); 3153 } 3154 view.setLayoutParams(params); 3155 } 3156 3157 /** 3158 * {@inheritDoc} 3159 */ 3160 protected boolean checkLayoutParams(ViewGroup.LayoutParams p) { 3161 return p != null; 3162 } 3163 3164 /** 3165 * Interface definition for a callback to be invoked when the hierarchy 3166 * within this view changed. The hierarchy changes whenever a child is added 3167 * to or removed from this view. 3168 */ 3169 public interface OnHierarchyChangeListener { 3170 /** 3171 * Called when a new child is added to a parent view. 3172 * 3173 * @param parent the view in which a child was added 3174 * @param child the new child view added in the hierarchy 3175 */ 3176 void onChildViewAdded(View parent, View child); 3177 3178 /** 3179 * Called when a child is removed from a parent view. 3180 * 3181 * @param parent the view from which the child was removed 3182 * @param child the child removed from the hierarchy 3183 */ 3184 void onChildViewRemoved(View parent, View child); 3185 } 3186 3187 /** 3188 * Register a callback to be invoked when a child is added to or removed 3189 * from this view. 3190 * 3191 * @param listener the callback to invoke on hierarchy change 3192 */ 3193 public void setOnHierarchyChangeListener(OnHierarchyChangeListener listener) { 3194 mOnHierarchyChangeListener = listener; 3195 } 3196 3197 /** 3198 * @hide 3199 */ 3200 protected void onViewAdded(View child) { 3201 if (mOnHierarchyChangeListener != null) { 3202 mOnHierarchyChangeListener.onChildViewAdded(this, child); 3203 } 3204 } 3205 3206 /** 3207 * @hide 3208 */ 3209 protected void onViewRemoved(View child) { 3210 if (mOnHierarchyChangeListener != null) { 3211 mOnHierarchyChangeListener.onChildViewRemoved(this, child); 3212 } 3213 } 3214 3215 /** 3216 * Adds a view during layout. This is useful if in your onLayout() method, 3217 * you need to add more views (as does the list view for example). 3218 * 3219 * If index is negative, it means put it at the end of the list. 3220 * 3221 * @param child the view to add to the group 3222 * @param index the index at which the child must be added 3223 * @param params the layout parameters to associate with the child 3224 * @return true if the child was added, false otherwise 3225 */ 3226 protected boolean addViewInLayout(View child, int index, LayoutParams params) { 3227 return addViewInLayout(child, index, params, false); 3228 } 3229 3230 /** 3231 * Adds a view during layout. This is useful if in your onLayout() method, 3232 * you need to add more views (as does the list view for example). 3233 * 3234 * If index is negative, it means put it at the end of the list. 3235 * 3236 * @param child the view to add to the group 3237 * @param index the index at which the child must be added 3238 * @param params the layout parameters to associate with the child 3239 * @param preventRequestLayout if true, calling this method will not trigger a 3240 * layout request on child 3241 * @return true if the child was added, false otherwise 3242 */ 3243 protected boolean addViewInLayout(View child, int index, LayoutParams params, 3244 boolean preventRequestLayout) { 3245 child.mParent = null; 3246 addViewInner(child, index, params, preventRequestLayout); 3247 child.mPrivateFlags = (child.mPrivateFlags & ~DIRTY_MASK) | DRAWN; 3248 return true; 3249 } 3250 3251 /** 3252 * Prevents the specified child to be laid out during the next layout pass. 3253 * 3254 * @param child the child on which to perform the cleanup 3255 */ 3256 protected void cleanupLayoutState(View child) { 3257 child.mPrivateFlags &= ~View.FORCE_LAYOUT; 3258 } 3259 3260 private void addViewInner(View child, int index, LayoutParams params, 3261 boolean preventRequestLayout) { 3262 3263 if (mTransition != null) { 3264 // Don't prevent other add transitions from completing, but cancel remove 3265 // transitions to let them complete the process before we add to the container 3266 mTransition.cancel(LayoutTransition.DISAPPEARING); 3267 } 3268 3269 if (child.getParent() != null) { 3270 throw new IllegalStateException("The specified child already has a parent. " + 3271 "You must call removeView() on the child's parent first."); 3272 } 3273 3274 if (mTransition != null) { 3275 mTransition.addChild(this, child); 3276 } 3277 3278 if (!checkLayoutParams(params)) { 3279 params = generateLayoutParams(params); 3280 } 3281 3282 if (preventRequestLayout) { 3283 child.mLayoutParams = params; 3284 } else { 3285 child.setLayoutParams(params); 3286 } 3287 3288 if (index < 0) { 3289 index = mChildrenCount; 3290 } 3291 3292 addInArray(child, index); 3293 3294 // tell our children 3295 if (preventRequestLayout) { 3296 child.assignParent(this); 3297 } else { 3298 child.mParent = this; 3299 } 3300 3301 if (child.hasFocus()) { 3302 requestChildFocus(child, child.findFocus()); 3303 } 3304 3305 AttachInfo ai = mAttachInfo; 3306 if (ai != null && (mGroupFlags & FLAG_PREVENT_DISPATCH_ATTACHED_TO_WINDOW) == 0) { 3307 boolean lastKeepOn = ai.mKeepScreenOn; 3308 ai.mKeepScreenOn = false; 3309 child.dispatchAttachedToWindow(mAttachInfo, (mViewFlags&VISIBILITY_MASK)); 3310 if (ai.mKeepScreenOn) { 3311 needGlobalAttributesUpdate(true); 3312 } 3313 ai.mKeepScreenOn = lastKeepOn; 3314 } 3315 3316 onViewAdded(child); 3317 3318 if ((child.mViewFlags & DUPLICATE_PARENT_STATE) == DUPLICATE_PARENT_STATE) { 3319 mGroupFlags |= FLAG_NOTIFY_CHILDREN_ON_DRAWABLE_STATE_CHANGE; 3320 } 3321 3322 if (child.hasTransientState()) { 3323 childHasTransientStateChanged(child, true); 3324 } 3325 } 3326 3327 private void addInArray(View child, int index) { 3328 View[] children = mChildren; 3329 final int count = mChildrenCount; 3330 final int size = children.length; 3331 if (index == count) { 3332 if (size == count) { 3333 mChildren = new View[size + ARRAY_CAPACITY_INCREMENT]; 3334 System.arraycopy(children, 0, mChildren, 0, size); 3335 children = mChildren; 3336 } 3337 children[mChildrenCount++] = child; 3338 } else if (index < count) { 3339 if (size == count) { 3340 mChildren = new View[size + ARRAY_CAPACITY_INCREMENT]; 3341 System.arraycopy(children, 0, mChildren, 0, index); 3342 System.arraycopy(children, index, mChildren, index + 1, count - index); 3343 children = mChildren; 3344 } else { 3345 System.arraycopy(children, index, children, index + 1, count - index); 3346 } 3347 children[index] = child; 3348 mChildrenCount++; 3349 if (mLastTouchDownIndex >= index) { 3350 mLastTouchDownIndex++; 3351 } 3352 } else { 3353 throw new IndexOutOfBoundsException("index=" + index + " count=" + count); 3354 } 3355 } 3356 3357 // This method also sets the child's mParent to null 3358 private void removeFromArray(int index) { 3359 final View[] children = mChildren; 3360 if (!(mTransitioningViews != null && mTransitioningViews.contains(children[index]))) { 3361 children[index].mParent = null; 3362 } 3363 final int count = mChildrenCount; 3364 if (index == count - 1) { 3365 children[--mChildrenCount] = null; 3366 } else if (index >= 0 && index < count) { 3367 System.arraycopy(children, index + 1, children, index, count - index - 1); 3368 children[--mChildrenCount] = null; 3369 } else { 3370 throw new IndexOutOfBoundsException(); 3371 } 3372 if (mLastTouchDownIndex == index) { 3373 mLastTouchDownTime = 0; 3374 mLastTouchDownIndex = -1; 3375 } else if (mLastTouchDownIndex > index) { 3376 mLastTouchDownIndex--; 3377 } 3378 } 3379 3380 // This method also sets the children's mParent to null 3381 private void removeFromArray(int start, int count) { 3382 final View[] children = mChildren; 3383 final int childrenCount = mChildrenCount; 3384 3385 start = Math.max(0, start); 3386 final int end = Math.min(childrenCount, start + count); 3387 3388 if (start == end) { 3389 return; 3390 } 3391 3392 if (end == childrenCount) { 3393 for (int i = start; i < end; i++) { 3394 children[i].mParent = null; 3395 children[i] = null; 3396 } 3397 } else { 3398 for (int i = start; i < end; i++) { 3399 children[i].mParent = null; 3400 } 3401 3402 // Since we're looping above, we might as well do the copy, but is arraycopy() 3403 // faster than the extra 2 bounds checks we would do in the loop? 3404 System.arraycopy(children, end, children, start, childrenCount - end); 3405 3406 for (int i = childrenCount - (end - start); i < childrenCount; i++) { 3407 children[i] = null; 3408 } 3409 } 3410 3411 mChildrenCount -= (end - start); 3412 } 3413 3414 private void bindLayoutAnimation(View child) { 3415 Animation a = mLayoutAnimationController.getAnimationForView(child); 3416 child.setAnimation(a); 3417 } 3418 3419 /** 3420 * Subclasses should override this method to set layout animation 3421 * parameters on the supplied child. 3422 * 3423 * @param child the child to associate with animation parameters 3424 * @param params the child's layout parameters which hold the animation 3425 * parameters 3426 * @param index the index of the child in the view group 3427 * @param count the number of children in the view group 3428 */ 3429 protected void attachLayoutAnimationParameters(View child, 3430 LayoutParams params, int index, int count) { 3431 LayoutAnimationController.AnimationParameters animationParams = 3432 params.layoutAnimationParameters; 3433 if (animationParams == null) { 3434 animationParams = new LayoutAnimationController.AnimationParameters(); 3435 params.layoutAnimationParameters = animationParams; 3436 } 3437 3438 animationParams.count = count; 3439 animationParams.index = index; 3440 } 3441 3442 /** 3443 * {@inheritDoc} 3444 */ 3445 public void removeView(View view) { 3446 removeViewInternal(view); 3447 requestLayout(); 3448 invalidate(true); 3449 } 3450 3451 /** 3452 * Removes a view during layout. This is useful if in your onLayout() method, 3453 * you need to remove more views. 3454 * 3455 * @param view the view to remove from the group 3456 */ 3457 public void removeViewInLayout(View view) { 3458 removeViewInternal(view); 3459 } 3460 3461 /** 3462 * Removes a range of views during layout. This is useful if in your onLayout() method, 3463 * you need to remove more views. 3464 * 3465 * @param start the index of the first view to remove from the group 3466 * @param count the number of views to remove from the group 3467 */ 3468 public void removeViewsInLayout(int start, int count) { 3469 removeViewsInternal(start, count); 3470 } 3471 3472 /** 3473 * Removes the view at the specified position in the group. 3474 * 3475 * @param index the position in the group of the view to remove 3476 */ 3477 public void removeViewAt(int index) { 3478 removeViewInternal(index, getChildAt(index)); 3479 requestLayout(); 3480 invalidate(true); 3481 } 3482 3483 /** 3484 * Removes the specified range of views from the group. 3485 * 3486 * @param start the first position in the group of the range of views to remove 3487 * @param count the number of views to remove 3488 */ 3489 public void removeViews(int start, int count) { 3490 removeViewsInternal(start, count); 3491 requestLayout(); 3492 invalidate(true); 3493 } 3494 3495 private void removeViewInternal(View view) { 3496 final int index = indexOfChild(view); 3497 if (index >= 0) { 3498 removeViewInternal(index, view); 3499 } 3500 } 3501 3502 private void removeViewInternal(int index, View view) { 3503 3504 if (mTransition != null) { 3505 mTransition.removeChild(this, view); 3506 } 3507 3508 boolean clearChildFocus = false; 3509 if (view == mFocused) { 3510 view.unFocus(); 3511 clearChildFocus = true; 3512 } 3513 3514 if (view.getAnimation() != null || 3515 (mTransitioningViews != null && mTransitioningViews.contains(view))) { 3516 addDisappearingView(view); 3517 } else if (view.mAttachInfo != null) { 3518 view.dispatchDetachedFromWindow(); 3519 } 3520 3521 if (view.hasTransientState()) { 3522 childHasTransientStateChanged(view, false); 3523 } 3524 3525 onViewRemoved(view); 3526 3527 needGlobalAttributesUpdate(false); 3528 3529 removeFromArray(index); 3530 3531 if (clearChildFocus) { 3532 clearChildFocus(view); 3533 ensureInputFocusOnFirstFocusable(); 3534 } 3535 3536 if (view.isAccessibilityFocused()) { 3537 view.clearAccessibilityFocus(); 3538 } 3539 } 3540 3541 /** 3542 * Sets the LayoutTransition object for this ViewGroup. If the LayoutTransition object is 3543 * not null, changes in layout which occur because of children being added to or removed from 3544 * the ViewGroup will be animated according to the animations defined in that LayoutTransition 3545 * object. By default, the transition object is null (so layout changes are not animated). 3546 * 3547 * @param transition The LayoutTransition object that will animated changes in layout. A value 3548 * of <code>null</code> means no transition will run on layout changes. 3549 * @attr ref android.R.styleable#ViewGroup_animateLayoutChanges 3550 */ 3551 public void setLayoutTransition(LayoutTransition transition) { 3552 if (mTransition != null) { 3553 mTransition.removeTransitionListener(mLayoutTransitionListener); 3554 } 3555 mTransition = transition; 3556 if (mTransition != null) { 3557 mTransition.addTransitionListener(mLayoutTransitionListener); 3558 } 3559 } 3560 3561 /** 3562 * Gets the LayoutTransition object for this ViewGroup. If the LayoutTransition object is 3563 * not null, changes in layout which occur because of children being added to or removed from 3564 * the ViewGroup will be animated according to the animations defined in that LayoutTransition 3565 * object. By default, the transition object is null (so layout changes are not animated). 3566 * 3567 * @return LayoutTranstion The LayoutTransition object that will animated changes in layout. 3568 * A value of <code>null</code> means no transition will run on layout changes. 3569 */ 3570 public LayoutTransition getLayoutTransition() { 3571 return mTransition; 3572 } 3573 3574 private void removeViewsInternal(int start, int count) { 3575 final View focused = mFocused; 3576 final boolean detach = mAttachInfo != null; 3577 View clearChildFocus = null; 3578 3579 final View[] children = mChildren; 3580 final int end = start + count; 3581 3582 for (int i = start; i < end; i++) { 3583 final View view = children[i]; 3584 3585 if (mTransition != null) { 3586 mTransition.removeChild(this, view); 3587 } 3588 3589 if (view == focused) { 3590 view.unFocus(); 3591 clearChildFocus = view; 3592 } 3593 3594 if (view.getAnimation() != null || 3595 (mTransitioningViews != null && mTransitioningViews.contains(view))) { 3596 addDisappearingView(view); 3597 } else if (detach) { 3598 view.dispatchDetachedFromWindow(); 3599 } 3600 3601 if (view.hasTransientState()) { 3602 childHasTransientStateChanged(view, false); 3603 } 3604 3605 needGlobalAttributesUpdate(false); 3606 3607 onViewRemoved(view); 3608 } 3609 3610 removeFromArray(start, count); 3611 3612 if (clearChildFocus != null) { 3613 clearChildFocus(clearChildFocus); 3614 ensureInputFocusOnFirstFocusable(); 3615 } 3616 } 3617 3618 /** 3619 * Call this method to remove all child views from the 3620 * ViewGroup. 3621 */ 3622 public void removeAllViews() { 3623 removeAllViewsInLayout(); 3624 requestLayout(); 3625 invalidate(true); 3626 } 3627 3628 /** 3629 * Called by a ViewGroup subclass to remove child views from itself, 3630 * when it must first know its size on screen before it can calculate how many 3631 * child views it will render. An example is a Gallery or a ListView, which 3632 * may "have" 50 children, but actually only render the number of children 3633 * that can currently fit inside the object on screen. Do not call 3634 * this method unless you are extending ViewGroup and understand the 3635 * view measuring and layout pipeline. 3636 */ 3637 public void removeAllViewsInLayout() { 3638 final int count = mChildrenCount; 3639 if (count <= 0) { 3640 return; 3641 } 3642 3643 final View[] children = mChildren; 3644 mChildrenCount = 0; 3645 3646 final View focused = mFocused; 3647 final boolean detach = mAttachInfo != null; 3648 View clearChildFocus = null; 3649 3650 needGlobalAttributesUpdate(false); 3651 3652 for (int i = count - 1; i >= 0; i--) { 3653 final View view = children[i]; 3654 3655 if (mTransition != null) { 3656 mTransition.removeChild(this, view); 3657 } 3658 3659 if (view == focused) { 3660 view.unFocus(); 3661 clearChildFocus = view; 3662 } 3663 3664 if (view.getAnimation() != null || 3665 (mTransitioningViews != null && mTransitioningViews.contains(view))) { 3666 addDisappearingView(view); 3667 } else if (detach) { 3668 view.dispatchDetachedFromWindow(); 3669 } 3670 3671 if (view.hasTransientState()) { 3672 childHasTransientStateChanged(view, false); 3673 } 3674 3675 onViewRemoved(view); 3676 3677 view.mParent = null; 3678 children[i] = null; 3679 } 3680 3681 if (clearChildFocus != null) { 3682 clearChildFocus(clearChildFocus); 3683 ensureInputFocusOnFirstFocusable(); 3684 } 3685 } 3686 3687 /** 3688 * Finishes the removal of a detached view. This method will dispatch the detached from 3689 * window event and notify the hierarchy change listener. 3690 * 3691 * @param child the child to be definitely removed from the view hierarchy 3692 * @param animate if true and the view has an animation, the view is placed in the 3693 * disappearing views list, otherwise, it is detached from the window 3694 * 3695 * @see #attachViewToParent(View, int, android.view.ViewGroup.LayoutParams) 3696 * @see #detachAllViewsFromParent() 3697 * @see #detachViewFromParent(View) 3698 * @see #detachViewFromParent(int) 3699 */ 3700 protected void removeDetachedView(View child, boolean animate) { 3701 if (mTransition != null) { 3702 mTransition.removeChild(this, child); 3703 } 3704 3705 if (child == mFocused) { 3706 child.clearFocus(); 3707 } 3708 3709 if ((animate && child.getAnimation() != null) || 3710 (mTransitioningViews != null && mTransitioningViews.contains(child))) { 3711 addDisappearingView(child); 3712 } else if (child.mAttachInfo != null) { 3713 child.dispatchDetachedFromWindow(); 3714 } 3715 3716 if (child.hasTransientState()) { 3717 childHasTransientStateChanged(child, false); 3718 } 3719 3720 onViewRemoved(child); 3721 } 3722 3723 /** 3724 * Attaches a view to this view group. Attaching a view assigns this group as the parent, 3725 * sets the layout parameters and puts the view in the list of children so it can be retrieved 3726 * by calling {@link #getChildAt(int)}. 3727 * 3728 * This method should be called only for view which were detached from their parent. 3729 * 3730 * @param child the child to attach 3731 * @param index the index at which the child should be attached 3732 * @param params the layout parameters of the child 3733 * 3734 * @see #removeDetachedView(View, boolean) 3735 * @see #detachAllViewsFromParent() 3736 * @see #detachViewFromParent(View) 3737 * @see #detachViewFromParent(int) 3738 */ 3739 protected void attachViewToParent(View child, int index, LayoutParams params) { 3740 child.mLayoutParams = params; 3741 3742 if (index < 0) { 3743 index = mChildrenCount; 3744 } 3745 3746 addInArray(child, index); 3747 3748 child.mParent = this; 3749 child.mPrivateFlags = (child.mPrivateFlags & ~DIRTY_MASK & ~DRAWING_CACHE_VALID) | 3750 DRAWN | INVALIDATED; 3751 this.mPrivateFlags |= INVALIDATED; 3752 3753 if (child.hasFocus()) { 3754 requestChildFocus(child, child.findFocus()); 3755 } 3756 } 3757 3758 /** 3759 * Detaches a view from its parent. Detaching a view should be temporary and followed 3760 * either by a call to {@link #attachViewToParent(View, int, android.view.ViewGroup.LayoutParams)} 3761 * or a call to {@link #removeDetachedView(View, boolean)}. When a view is detached, 3762 * its parent is null and cannot be retrieved by a call to {@link #getChildAt(int)}. 3763 * 3764 * @param child the child to detach 3765 * 3766 * @see #detachViewFromParent(int) 3767 * @see #detachViewsFromParent(int, int) 3768 * @see #detachAllViewsFromParent() 3769 * @see #attachViewToParent(View, int, android.view.ViewGroup.LayoutParams) 3770 * @see #removeDetachedView(View, boolean) 3771 */ 3772 protected void detachViewFromParent(View child) { 3773 removeFromArray(indexOfChild(child)); 3774 } 3775 3776 /** 3777 * Detaches a view from its parent. Detaching a view should be temporary and followed 3778 * either by a call to {@link #attachViewToParent(View, int, android.view.ViewGroup.LayoutParams)} 3779 * or a call to {@link #removeDetachedView(View, boolean)}. When a view is detached, 3780 * its parent is null and cannot be retrieved by a call to {@link #getChildAt(int)}. 3781 * 3782 * @param index the index of the child to detach 3783 * 3784 * @see #detachViewFromParent(View) 3785 * @see #detachAllViewsFromParent() 3786 * @see #detachViewsFromParent(int, int) 3787 * @see #attachViewToParent(View, int, android.view.ViewGroup.LayoutParams) 3788 * @see #removeDetachedView(View, boolean) 3789 */ 3790 protected void detachViewFromParent(int index) { 3791 removeFromArray(index); 3792 } 3793 3794 /** 3795 * Detaches a range of view from their parent. Detaching a view should be temporary and followed 3796 * either by a call to {@link #attachViewToParent(View, int, android.view.ViewGroup.LayoutParams)} 3797 * or a call to {@link #removeDetachedView(View, boolean)}. When a view is detached, its 3798 * parent is null and cannot be retrieved by a call to {@link #getChildAt(int)}. 3799 * 3800 * @param start the first index of the childrend range to detach 3801 * @param count the number of children to detach 3802 * 3803 * @see #detachViewFromParent(View) 3804 * @see #detachViewFromParent(int) 3805 * @see #detachAllViewsFromParent() 3806 * @see #attachViewToParent(View, int, android.view.ViewGroup.LayoutParams) 3807 * @see #removeDetachedView(View, boolean) 3808 */ 3809 protected void detachViewsFromParent(int start, int count) { 3810 removeFromArray(start, count); 3811 } 3812 3813 /** 3814 * Detaches all views from the parent. Detaching a view should be temporary and followed 3815 * either by a call to {@link #attachViewToParent(View, int, android.view.ViewGroup.LayoutParams)} 3816 * or a call to {@link #removeDetachedView(View, boolean)}. When a view is detached, 3817 * its parent is null and cannot be retrieved by a call to {@link #getChildAt(int)}. 3818 * 3819 * @see #detachViewFromParent(View) 3820 * @see #detachViewFromParent(int) 3821 * @see #detachViewsFromParent(int, int) 3822 * @see #attachViewToParent(View, int, android.view.ViewGroup.LayoutParams) 3823 * @see #removeDetachedView(View, boolean) 3824 */ 3825 protected void detachAllViewsFromParent() { 3826 final int count = mChildrenCount; 3827 if (count <= 0) { 3828 return; 3829 } 3830 3831 final View[] children = mChildren; 3832 mChildrenCount = 0; 3833 3834 for (int i = count - 1; i >= 0; i--) { 3835 children[i].mParent = null; 3836 children[i] = null; 3837 } 3838 } 3839 3840 /** 3841 * Don't call or override this method. It is used for the implementation of 3842 * the view hierarchy. 3843 */ 3844 public final void invalidateChild(View child, final Rect dirty) { 3845 if (ViewDebug.TRACE_HIERARCHY) { 3846 ViewDebug.trace(this, ViewDebug.HierarchyTraceType.INVALIDATE_CHILD); 3847 } 3848 3849 ViewParent parent = this; 3850 3851 final AttachInfo attachInfo = mAttachInfo; 3852 if (attachInfo != null) { 3853 // If the child is drawing an animation, we want to copy this flag onto 3854 // ourselves and the parent to make sure the invalidate request goes 3855 // through 3856 final boolean drawAnimation = (child.mPrivateFlags & DRAW_ANIMATION) == DRAW_ANIMATION; 3857 3858 //noinspection PointlessBooleanExpression 3859 if (!HardwareRenderer.RENDER_DIRTY_REGIONS) { 3860 if (dirty == null) { 3861 if (child.mLayerType != LAYER_TYPE_NONE) { 3862 mPrivateFlags |= INVALIDATED; 3863 mPrivateFlags &= ~DRAWING_CACHE_VALID; 3864 child.mLocalDirtyRect.setEmpty(); 3865 } 3866 do { 3867 View view = null; 3868 if (parent instanceof View) { 3869 view = (View) parent; 3870 if (view.mLayerType != LAYER_TYPE_NONE) { 3871 view.mLocalDirtyRect.setEmpty(); 3872 if (view.getParent() instanceof View) { 3873 final View grandParent = (View) view.getParent(); 3874 grandParent.mPrivateFlags |= INVALIDATED; 3875 grandParent.mPrivateFlags &= ~DRAWING_CACHE_VALID; 3876 } 3877 } 3878 if ((view.mPrivateFlags & DIRTY_MASK) != 0) { 3879 // already marked dirty - we're done 3880 break; 3881 } 3882 } 3883 3884 if (drawAnimation) { 3885 if (view != null) { 3886 view.mPrivateFlags |= DRAW_ANIMATION; 3887 } else if (parent instanceof ViewRootImpl) { 3888 ((ViewRootImpl) parent).mIsAnimating = true; 3889 } 3890 } 3891 3892 if (parent instanceof ViewRootImpl) { 3893 ((ViewRootImpl) parent).invalidate(); 3894 parent = null; 3895 } else if (view != null) { 3896 if ((view.mPrivateFlags & DRAWN) == DRAWN || 3897 (view.mPrivateFlags & DRAWING_CACHE_VALID) == DRAWING_CACHE_VALID) { 3898 view.mPrivateFlags &= ~DRAWING_CACHE_VALID; 3899 view.mPrivateFlags |= DIRTY; 3900 parent = view.mParent; 3901 } else { 3902 parent = null; 3903 } 3904 } 3905 } while (parent != null); 3906 } 3907 3908 return; 3909 } 3910 3911 // Check whether the child that requests the invalidate is fully opaque 3912 // Views being animated or transformed are not considered opaque because we may 3913 // be invalidating their old position and need the parent to paint behind them. 3914 Matrix childMatrix = child.getMatrix(); 3915 final boolean isOpaque = child.isOpaque() && !drawAnimation && 3916 child.getAnimation() == null && childMatrix.isIdentity(); 3917 // Mark the child as dirty, using the appropriate flag 3918 // Make sure we do not set both flags at the same time 3919 int opaqueFlag = isOpaque ? DIRTY_OPAQUE : DIRTY; 3920 3921 if (child.mLayerType != LAYER_TYPE_NONE) { 3922 mPrivateFlags |= INVALIDATED; 3923 mPrivateFlags &= ~DRAWING_CACHE_VALID; 3924 child.mLocalDirtyRect.union(dirty); 3925 } 3926 3927 final int[] location = attachInfo.mInvalidateChildLocation; 3928 location[CHILD_LEFT_INDEX] = child.mLeft; 3929 location[CHILD_TOP_INDEX] = child.mTop; 3930 if (!childMatrix.isIdentity()) { 3931 RectF boundingRect = attachInfo.mTmpTransformRect; 3932 boundingRect.set(dirty); 3933 //boundingRect.inset(-0.5f, -0.5f); 3934 childMatrix.mapRect(boundingRect); 3935 dirty.set((int) (boundingRect.left - 0.5f), 3936 (int) (boundingRect.top - 0.5f), 3937 (int) (boundingRect.right + 0.5f), 3938 (int) (boundingRect.bottom + 0.5f)); 3939 } 3940 3941 do { 3942 View view = null; 3943 if (parent instanceof View) { 3944 view = (View) parent; 3945 if (view.mLayerType != LAYER_TYPE_NONE && 3946 view.getParent() instanceof View) { 3947 final View grandParent = (View) view.getParent(); 3948 grandParent.mPrivateFlags |= INVALIDATED; 3949 grandParent.mPrivateFlags &= ~DRAWING_CACHE_VALID; 3950 } 3951 } 3952 3953 if (drawAnimation) { 3954 if (view != null) { 3955 view.mPrivateFlags |= DRAW_ANIMATION; 3956 } else if (parent instanceof ViewRootImpl) { 3957 ((ViewRootImpl) parent).mIsAnimating = true; 3958 } 3959 } 3960 3961 // If the parent is dirty opaque or not dirty, mark it dirty with the opaque 3962 // flag coming from the child that initiated the invalidate 3963 if (view != null) { 3964 if ((view.mViewFlags & FADING_EDGE_MASK) != 0 && 3965 view.getSolidColor() == 0) { 3966 opaqueFlag = DIRTY; 3967 } 3968 if ((view.mPrivateFlags & DIRTY_MASK) != DIRTY) { 3969 view.mPrivateFlags = (view.mPrivateFlags & ~DIRTY_MASK) | opaqueFlag; 3970 } 3971 } 3972 3973 parent = parent.invalidateChildInParent(location, dirty); 3974 if (view != null) { 3975 // Account for transform on current parent 3976 Matrix m = view.getMatrix(); 3977 if (!m.isIdentity()) { 3978 RectF boundingRect = attachInfo.mTmpTransformRect; 3979 boundingRect.set(dirty); 3980 m.mapRect(boundingRect); 3981 dirty.set((int) (boundingRect.left - 0.5f), 3982 (int) (boundingRect.top - 0.5f), 3983 (int) (boundingRect.right + 0.5f), 3984 (int) (boundingRect.bottom + 0.5f)); 3985 } 3986 } 3987 } while (parent != null); 3988 } 3989 } 3990 3991 /** 3992 * Don't call or override this method. It is used for the implementation of 3993 * the view hierarchy. 3994 * 3995 * This implementation returns null if this ViewGroup does not have a parent, 3996 * if this ViewGroup is already fully invalidated or if the dirty rectangle 3997 * does not intersect with this ViewGroup's bounds. 3998 */ 3999 public ViewParent invalidateChildInParent(final int[] location, final Rect dirty) { 4000 if (ViewDebug.TRACE_HIERARCHY) { 4001 ViewDebug.trace(this, ViewDebug.HierarchyTraceType.INVALIDATE_CHILD_IN_PARENT); 4002 } 4003 4004 if ((mPrivateFlags & DRAWN) == DRAWN || 4005 (mPrivateFlags & DRAWING_CACHE_VALID) == DRAWING_CACHE_VALID) { 4006 if ((mGroupFlags & (FLAG_OPTIMIZE_INVALIDATE | FLAG_ANIMATION_DONE)) != 4007 FLAG_OPTIMIZE_INVALIDATE) { 4008 dirty.offset(location[CHILD_LEFT_INDEX] - mScrollX, 4009 location[CHILD_TOP_INDEX] - mScrollY); 4010 4011 final int left = mLeft; 4012 final int top = mTop; 4013 4014 if ((mGroupFlags & FLAG_CLIP_CHILDREN) != FLAG_CLIP_CHILDREN || 4015 dirty.intersect(0, 0, mRight - left, mBottom - top) || 4016 (mPrivateFlags & DRAW_ANIMATION) == DRAW_ANIMATION) { 4017 mPrivateFlags &= ~DRAWING_CACHE_VALID; 4018 4019 location[CHILD_LEFT_INDEX] = left; 4020 location[CHILD_TOP_INDEX] = top; 4021 4022 if (mLayerType != LAYER_TYPE_NONE) { 4023 mLocalDirtyRect.union(dirty); 4024 } 4025 4026 return mParent; 4027 } 4028 } else { 4029 mPrivateFlags &= ~DRAWN & ~DRAWING_CACHE_VALID; 4030 4031 location[CHILD_LEFT_INDEX] = mLeft; 4032 location[CHILD_TOP_INDEX] = mTop; 4033 if ((mGroupFlags & FLAG_CLIP_CHILDREN) == FLAG_CLIP_CHILDREN) { 4034 dirty.set(0, 0, mRight - mLeft, mBottom - mTop); 4035 } else { 4036 // in case the dirty rect extends outside the bounds of this container 4037 dirty.union(0, 0, mRight - mLeft, mBottom - mTop); 4038 } 4039 4040 if (mLayerType != LAYER_TYPE_NONE) { 4041 mLocalDirtyRect.union(dirty); 4042 } 4043 4044 return mParent; 4045 } 4046 } 4047 4048 return null; 4049 } 4050 4051 /** 4052 * Quick invalidation method called by View.invalidateViewProperty. This doesn't set the 4053 * DRAWN flags and doesn't handle the Animation logic that the default invalidation methods 4054 * do; all we want to do here is schedule a traversal with the appropriate dirty rect. 4055 * 4056 * @hide 4057 */ 4058 public void invalidateChildFast(View child, final Rect dirty) { 4059 ViewParent parent = this; 4060 4061 final AttachInfo attachInfo = mAttachInfo; 4062 if (attachInfo != null) { 4063 if (child.mLayerType != LAYER_TYPE_NONE) { 4064 child.mLocalDirtyRect.union(dirty); 4065 } 4066 4067 int left = child.mLeft; 4068 int top = child.mTop; 4069 if (!child.getMatrix().isIdentity()) { 4070 child.transformRect(dirty); 4071 } 4072 4073 do { 4074 if (parent instanceof ViewGroup) { 4075 ViewGroup parentVG = (ViewGroup) parent; 4076 if (parentVG.mLayerType != LAYER_TYPE_NONE) { 4077 // Layered parents should be recreated, not just re-issued 4078 parentVG.invalidate(); 4079 parent = null; 4080 } else { 4081 parent = parentVG.invalidateChildInParentFast(left, top, dirty); 4082 left = parentVG.mLeft; 4083 top = parentVG.mTop; 4084 } 4085 } else { 4086 // Reached the top; this calls into the usual invalidate method in 4087 // ViewRootImpl, which schedules a traversal 4088 final int[] location = attachInfo.mInvalidateChildLocation; 4089 location[0] = left; 4090 location[1] = top; 4091 parent = parent.invalidateChildInParent(location, dirty); 4092 } 4093 } while (parent != null); 4094 } 4095 } 4096 4097 /** 4098 * Quick invalidation method that simply transforms the dirty rect into the parent's 4099 * coordinate system, pruning the invalidation if the parent has already been invalidated. 4100 */ 4101 private ViewParent invalidateChildInParentFast(int left, int top, final Rect dirty) { 4102 if ((mPrivateFlags & DRAWN) == DRAWN || 4103 (mPrivateFlags & DRAWING_CACHE_VALID) == DRAWING_CACHE_VALID) { 4104 dirty.offset(left - mScrollX, top - mScrollY); 4105 4106 if ((mGroupFlags & FLAG_CLIP_CHILDREN) == 0 || 4107 dirty.intersect(0, 0, mRight - mLeft, mBottom - mTop)) { 4108 4109 if (mLayerType != LAYER_TYPE_NONE) { 4110 mLocalDirtyRect.union(dirty); 4111 } 4112 if (!getMatrix().isIdentity()) { 4113 transformRect(dirty); 4114 } 4115 4116 return mParent; 4117 } 4118 } 4119 4120 return null; 4121 } 4122 4123 /** 4124 * Offset a rectangle that is in a descendant's coordinate 4125 * space into our coordinate space. 4126 * @param descendant A descendant of this view 4127 * @param rect A rectangle defined in descendant's coordinate space. 4128 */ 4129 public final void offsetDescendantRectToMyCoords(View descendant, Rect rect) { 4130 offsetRectBetweenParentAndChild(descendant, rect, true, false); 4131 } 4132 4133 /** 4134 * Offset a rectangle that is in our coordinate space into an ancestor's 4135 * coordinate space. 4136 * @param descendant A descendant of this view 4137 * @param rect A rectangle defined in descendant's coordinate space. 4138 */ 4139 public final void offsetRectIntoDescendantCoords(View descendant, Rect rect) { 4140 offsetRectBetweenParentAndChild(descendant, rect, false, false); 4141 } 4142 4143 /** 4144 * Helper method that offsets a rect either from parent to descendant or 4145 * descendant to parent. 4146 */ 4147 void offsetRectBetweenParentAndChild(View descendant, Rect rect, 4148 boolean offsetFromChildToParent, boolean clipToBounds) { 4149 4150 // already in the same coord system :) 4151 if (descendant == this) { 4152 return; 4153 } 4154 4155 ViewParent theParent = descendant.mParent; 4156 4157 // search and offset up to the parent 4158 while ((theParent != null) 4159 && (theParent instanceof View) 4160 && (theParent != this)) { 4161 4162 if (offsetFromChildToParent) { 4163 rect.offset(descendant.mLeft - descendant.mScrollX, 4164 descendant.mTop - descendant.mScrollY); 4165 if (clipToBounds) { 4166 View p = (View) theParent; 4167 rect.intersect(0, 0, p.mRight - p.mLeft, p.mBottom - p.mTop); 4168 } 4169 } else { 4170 if (clipToBounds) { 4171 View p = (View) theParent; 4172 rect.intersect(0, 0, p.mRight - p.mLeft, p.mBottom - p.mTop); 4173 } 4174 rect.offset(descendant.mScrollX - descendant.mLeft, 4175 descendant.mScrollY - descendant.mTop); 4176 } 4177 4178 descendant = (View) theParent; 4179 theParent = descendant.mParent; 4180 } 4181 4182 // now that we are up to this view, need to offset one more time 4183 // to get into our coordinate space 4184 if (theParent == this) { 4185 if (offsetFromChildToParent) { 4186 rect.offset(descendant.mLeft - descendant.mScrollX, 4187 descendant.mTop - descendant.mScrollY); 4188 } else { 4189 rect.offset(descendant.mScrollX - descendant.mLeft, 4190 descendant.mScrollY - descendant.mTop); 4191 } 4192 } else { 4193 throw new IllegalArgumentException("parameter must be a descendant of this view"); 4194 } 4195 } 4196 4197 /** 4198 * Offset the vertical location of all children of this view by the specified number of pixels. 4199 * 4200 * @param offset the number of pixels to offset 4201 * 4202 * @hide 4203 */ 4204 public void offsetChildrenTopAndBottom(int offset) { 4205 final int count = mChildrenCount; 4206 final View[] children = mChildren; 4207 4208 for (int i = 0; i < count; i++) { 4209 final View v = children[i]; 4210 v.mTop += offset; 4211 v.mBottom += offset; 4212 if (USE_DISPLAY_LIST_PROPERTIES && v.mDisplayList != null) { 4213 v.mDisplayList.offsetTopBottom(offset); 4214 invalidateViewProperty(false, false); 4215 } 4216 } 4217 } 4218 4219 /** 4220 * {@inheritDoc} 4221 */ 4222 public boolean getChildVisibleRect(View child, Rect r, android.graphics.Point offset) { 4223 // It doesn't make a whole lot of sense to call this on a view that isn't attached, 4224 // but for some simple tests it can be useful. If we don't have attach info this 4225 // will allocate memory. 4226 final RectF rect = mAttachInfo != null ? mAttachInfo.mTmpTransformRect : new RectF(); 4227 rect.set(r); 4228 4229 if (!child.hasIdentityMatrix()) { 4230 child.getMatrix().mapRect(rect); 4231 } 4232 4233 int dx = child.mLeft - mScrollX; 4234 int dy = child.mTop - mScrollY; 4235 4236 rect.offset(dx, dy); 4237 4238 if (offset != null) { 4239 if (!child.hasIdentityMatrix()) { 4240 float[] position = mAttachInfo != null ? mAttachInfo.mTmpTransformLocation 4241 : new float[2]; 4242 position[0] = offset.x; 4243 position[1] = offset.y; 4244 child.getMatrix().mapPoints(position); 4245 offset.x = (int) (position[0] + 0.5f); 4246 offset.y = (int) (position[1] + 0.5f); 4247 } 4248 offset.x += dx; 4249 offset.y += dy; 4250 } 4251 4252 if (rect.intersect(0, 0, mRight - mLeft, mBottom - mTop)) { 4253 if (mParent == null) return true; 4254 r.set((int) (rect.left + 0.5f), (int) (rect.top + 0.5f), 4255 (int) (rect.right + 0.5f), (int) (rect.bottom + 0.5f)); 4256 return mParent.getChildVisibleRect(this, r, offset); 4257 } 4258 4259 return false; 4260 } 4261 4262 /** 4263 * {@inheritDoc} 4264 */ 4265 @Override 4266 public final void layout(int l, int t, int r, int b) { 4267 if (mTransition == null || !mTransition.isChangingLayout()) { 4268 if (mTransition != null) { 4269 mTransition.layoutChange(this); 4270 } 4271 super.layout(l, t, r, b); 4272 } else { 4273 // record the fact that we noop'd it; request layout when transition finishes 4274 mLayoutSuppressed = true; 4275 } 4276 } 4277 4278 /** 4279 * {@inheritDoc} 4280 */ 4281 @Override 4282 protected abstract void onLayout(boolean changed, 4283 int l, int t, int r, int b); 4284 4285 /** 4286 * Indicates whether the view group has the ability to animate its children 4287 * after the first layout. 4288 * 4289 * @return true if the children can be animated, false otherwise 4290 */ 4291 protected boolean canAnimate() { 4292 return mLayoutAnimationController != null; 4293 } 4294 4295 /** 4296 * Runs the layout animation. Calling this method triggers a relayout of 4297 * this view group. 4298 */ 4299 public void startLayoutAnimation() { 4300 if (mLayoutAnimationController != null) { 4301 mGroupFlags |= FLAG_RUN_ANIMATION; 4302 requestLayout(); 4303 } 4304 } 4305 4306 /** 4307 * Schedules the layout animation to be played after the next layout pass 4308 * of this view group. This can be used to restart the layout animation 4309 * when the content of the view group changes or when the activity is 4310 * paused and resumed. 4311 */ 4312 public void scheduleLayoutAnimation() { 4313 mGroupFlags |= FLAG_RUN_ANIMATION; 4314 } 4315 4316 /** 4317 * Sets the layout animation controller used to animate the group's 4318 * children after the first layout. 4319 * 4320 * @param controller the animation controller 4321 */ 4322 public void setLayoutAnimation(LayoutAnimationController controller) { 4323 mLayoutAnimationController = controller; 4324 if (mLayoutAnimationController != null) { 4325 mGroupFlags |= FLAG_RUN_ANIMATION; 4326 } 4327 } 4328 4329 /** 4330 * Returns the layout animation controller used to animate the group's 4331 * children. 4332 * 4333 * @return the current animation controller 4334 */ 4335 public LayoutAnimationController getLayoutAnimation() { 4336 return mLayoutAnimationController; 4337 } 4338 4339 /** 4340 * Indicates whether the children's drawing cache is used during a layout 4341 * animation. By default, the drawing cache is enabled but this will prevent 4342 * nested layout animations from working. To nest animations, you must disable 4343 * the cache. 4344 * 4345 * @return true if the animation cache is enabled, false otherwise 4346 * 4347 * @see #setAnimationCacheEnabled(boolean) 4348 * @see View#setDrawingCacheEnabled(boolean) 4349 */ 4350 @ViewDebug.ExportedProperty 4351 public boolean isAnimationCacheEnabled() { 4352 return (mGroupFlags & FLAG_ANIMATION_CACHE) == FLAG_ANIMATION_CACHE; 4353 } 4354 4355 /** 4356 * Enables or disables the children's drawing cache during a layout animation. 4357 * By default, the drawing cache is enabled but this will prevent nested 4358 * layout animations from working. To nest animations, you must disable the 4359 * cache. 4360 * 4361 * @param enabled true to enable the animation cache, false otherwise 4362 * 4363 * @see #isAnimationCacheEnabled() 4364 * @see View#setDrawingCacheEnabled(boolean) 4365 */ 4366 public void setAnimationCacheEnabled(boolean enabled) { 4367 setBooleanFlag(FLAG_ANIMATION_CACHE, enabled); 4368 } 4369 4370 /** 4371 * Indicates whether this ViewGroup will always try to draw its children using their 4372 * drawing cache. By default this property is enabled. 4373 * 4374 * @return true if the animation cache is enabled, false otherwise 4375 * 4376 * @see #setAlwaysDrawnWithCacheEnabled(boolean) 4377 * @see #setChildrenDrawnWithCacheEnabled(boolean) 4378 * @see View#setDrawingCacheEnabled(boolean) 4379 */ 4380 @ViewDebug.ExportedProperty(category = "drawing") 4381 public boolean isAlwaysDrawnWithCacheEnabled() { 4382 return (mGroupFlags & FLAG_ALWAYS_DRAWN_WITH_CACHE) == FLAG_ALWAYS_DRAWN_WITH_CACHE; 4383 } 4384 4385 /** 4386 * Indicates whether this ViewGroup will always try to draw its children using their 4387 * drawing cache. This property can be set to true when the cache rendering is 4388 * slightly different from the children's normal rendering. Renderings can be different, 4389 * for instance, when the cache's quality is set to low. 4390 * 4391 * When this property is disabled, the ViewGroup will use the drawing cache of its 4392 * children only when asked to. It's usually the task of subclasses to tell ViewGroup 4393 * when to start using the drawing cache and when to stop using it. 4394 * 4395 * @param always true to always draw with the drawing cache, false otherwise 4396 * 4397 * @see #isAlwaysDrawnWithCacheEnabled() 4398 * @see #setChildrenDrawnWithCacheEnabled(boolean) 4399 * @see View#setDrawingCacheEnabled(boolean) 4400 * @see View#setDrawingCacheQuality(int) 4401 */ 4402 public void setAlwaysDrawnWithCacheEnabled(boolean always) { 4403 setBooleanFlag(FLAG_ALWAYS_DRAWN_WITH_CACHE, always); 4404 } 4405 4406 /** 4407 * Indicates whether the ViewGroup is currently drawing its children using 4408 * their drawing cache. 4409 * 4410 * @return true if children should be drawn with their cache, false otherwise 4411 * 4412 * @see #setAlwaysDrawnWithCacheEnabled(boolean) 4413 * @see #setChildrenDrawnWithCacheEnabled(boolean) 4414 */ 4415 @ViewDebug.ExportedProperty(category = "drawing") 4416 protected boolean isChildrenDrawnWithCacheEnabled() { 4417 return (mGroupFlags & FLAG_CHILDREN_DRAWN_WITH_CACHE) == FLAG_CHILDREN_DRAWN_WITH_CACHE; 4418 } 4419 4420 /** 4421 * Tells the ViewGroup to draw its children using their drawing cache. This property 4422 * is ignored when {@link #isAlwaysDrawnWithCacheEnabled()} is true. A child's drawing cache 4423 * will be used only if it has been enabled. 4424 * 4425 * Subclasses should call this method to start and stop using the drawing cache when 4426 * they perform performance sensitive operations, like scrolling or animating. 4427 * 4428 * @param enabled true if children should be drawn with their cache, false otherwise 4429 * 4430 * @see #setAlwaysDrawnWithCacheEnabled(boolean) 4431 * @see #isChildrenDrawnWithCacheEnabled() 4432 */ 4433 protected void setChildrenDrawnWithCacheEnabled(boolean enabled) { 4434 setBooleanFlag(FLAG_CHILDREN_DRAWN_WITH_CACHE, enabled); 4435 } 4436 4437 /** 4438 * Indicates whether the ViewGroup is drawing its children in the order defined by 4439 * {@link #getChildDrawingOrder(int, int)}. 4440 * 4441 * @return true if children drawing order is defined by {@link #getChildDrawingOrder(int, int)}, 4442 * false otherwise 4443 * 4444 * @see #setChildrenDrawingOrderEnabled(boolean) 4445 * @see #getChildDrawingOrder(int, int) 4446 */ 4447 @ViewDebug.ExportedProperty(category = "drawing") 4448 protected boolean isChildrenDrawingOrderEnabled() { 4449 return (mGroupFlags & FLAG_USE_CHILD_DRAWING_ORDER) == FLAG_USE_CHILD_DRAWING_ORDER; 4450 } 4451 4452 /** 4453 * Tells the ViewGroup whether to draw its children in the order defined by the method 4454 * {@link #getChildDrawingOrder(int, int)}. 4455 * 4456 * @param enabled true if the order of the children when drawing is determined by 4457 * {@link #getChildDrawingOrder(int, int)}, false otherwise 4458 * 4459 * @see #isChildrenDrawingOrderEnabled() 4460 * @see #getChildDrawingOrder(int, int) 4461 */ 4462 protected void setChildrenDrawingOrderEnabled(boolean enabled) { 4463 setBooleanFlag(FLAG_USE_CHILD_DRAWING_ORDER, enabled); 4464 } 4465 4466 private void setBooleanFlag(int flag, boolean value) { 4467 if (value) { 4468 mGroupFlags |= flag; 4469 } else { 4470 mGroupFlags &= ~flag; 4471 } 4472 } 4473 4474 /** 4475 * Returns an integer indicating what types of drawing caches are kept in memory. 4476 * 4477 * @see #setPersistentDrawingCache(int) 4478 * @see #setAnimationCacheEnabled(boolean) 4479 * 4480 * @return one or a combination of {@link #PERSISTENT_NO_CACHE}, 4481 * {@link #PERSISTENT_ANIMATION_CACHE}, {@link #PERSISTENT_SCROLLING_CACHE} 4482 * and {@link #PERSISTENT_ALL_CACHES} 4483 */ 4484 @ViewDebug.ExportedProperty(category = "drawing", mapping = { 4485 @ViewDebug.IntToString(from = PERSISTENT_NO_CACHE, to = "NONE"), 4486 @ViewDebug.IntToString(from = PERSISTENT_ANIMATION_CACHE, to = "ANIMATION"), 4487 @ViewDebug.IntToString(from = PERSISTENT_SCROLLING_CACHE, to = "SCROLLING"), 4488 @ViewDebug.IntToString(from = PERSISTENT_ALL_CACHES, to = "ALL") 4489 }) 4490 public int getPersistentDrawingCache() { 4491 return mPersistentDrawingCache; 4492 } 4493 4494 /** 4495 * Indicates what types of drawing caches should be kept in memory after 4496 * they have been created. 4497 * 4498 * @see #getPersistentDrawingCache() 4499 * @see #setAnimationCacheEnabled(boolean) 4500 * 4501 * @param drawingCacheToKeep one or a combination of {@link #PERSISTENT_NO_CACHE}, 4502 * {@link #PERSISTENT_ANIMATION_CACHE}, {@link #PERSISTENT_SCROLLING_CACHE} 4503 * and {@link #PERSISTENT_ALL_CACHES} 4504 */ 4505 public void setPersistentDrawingCache(int drawingCacheToKeep) { 4506 mPersistentDrawingCache = drawingCacheToKeep & PERSISTENT_ALL_CACHES; 4507 } 4508 4509 /** 4510 * Returns the basis of alignment during the layout of this view group: 4511 * either {@link #COMPONENT_BOUNDS} or {@link #LAYOUT_BOUNDS}. 4512 * 4513 * @return the layout mode to use during layout operations 4514 * 4515 * @see #setLayoutMode(int) 4516 */ 4517 public int getLayoutMode() { 4518 if (mLayoutMode == UNDEFINED_LAYOUT_MODE) { 4519 ViewParent parent = getParent(); 4520 if (parent instanceof ViewGroup) { 4521 ViewGroup viewGroup = (ViewGroup) parent; 4522 return viewGroup.getLayoutMode(); 4523 } else { 4524 int targetSdkVersion = mContext.getApplicationInfo().targetSdkVersion; 4525 boolean preJellyBean = targetSdkVersion < Build.VERSION_CODES.JELLY_BEAN; 4526 return preJellyBean ? COMPONENT_BOUNDS : LAYOUT_BOUNDS; 4527 } 4528 4529 } 4530 return mLayoutMode; 4531 } 4532 4533 /** 4534 * Sets the basis of alignment during alignment of this view group. 4535 * Valid values are either {@link #COMPONENT_BOUNDS} or {@link #LAYOUT_BOUNDS}. 4536 * <p> 4537 * The default is to query the property of the parent if this view group has a parent. 4538 * If this ViewGroup is the root of the view hierarchy the default 4539 * value is {@link #LAYOUT_BOUNDS} for target SDK's greater than JellyBean, 4540 * {@link #LAYOUT_BOUNDS} otherwise. 4541 * 4542 * @param layoutMode the layout mode to use during layout operations 4543 * 4544 * @see #getLayoutMode() 4545 */ 4546 public void setLayoutMode(int layoutMode) { 4547 if (mLayoutMode != layoutMode) { 4548 mLayoutMode = layoutMode; 4549 requestLayout(); 4550 } 4551 } 4552 4553 /** 4554 * Returns a new set of layout parameters based on the supplied attributes set. 4555 * 4556 * @param attrs the attributes to build the layout parameters from 4557 * 4558 * @return an instance of {@link android.view.ViewGroup.LayoutParams} or one 4559 * of its descendants 4560 */ 4561 public LayoutParams generateLayoutParams(AttributeSet attrs) { 4562 return new LayoutParams(getContext(), attrs); 4563 } 4564 4565 /** 4566 * Returns a safe set of layout parameters based on the supplied layout params. 4567 * When a ViewGroup is passed a View whose layout params do not pass the test of 4568 * {@link #checkLayoutParams(android.view.ViewGroup.LayoutParams)}, this method 4569 * is invoked. This method should return a new set of layout params suitable for 4570 * this ViewGroup, possibly by copying the appropriate attributes from the 4571 * specified set of layout params. 4572 * 4573 * @param p The layout parameters to convert into a suitable set of layout parameters 4574 * for this ViewGroup. 4575 * 4576 * @return an instance of {@link android.view.ViewGroup.LayoutParams} or one 4577 * of its descendants 4578 */ 4579 protected LayoutParams generateLayoutParams(ViewGroup.LayoutParams p) { 4580 return p; 4581 } 4582 4583 /** 4584 * Returns a set of default layout parameters. These parameters are requested 4585 * when the View passed to {@link #addView(View)} has no layout parameters 4586 * already set. If null is returned, an exception is thrown from addView. 4587 * 4588 * @return a set of default layout parameters or null 4589 */ 4590 protected LayoutParams generateDefaultLayoutParams() { 4591 return new LayoutParams(LayoutParams.WRAP_CONTENT, LayoutParams.WRAP_CONTENT); 4592 } 4593 4594 /** 4595 * @hide 4596 */ 4597 @Override 4598 protected boolean dispatchConsistencyCheck(int consistency) { 4599 boolean result = super.dispatchConsistencyCheck(consistency); 4600 4601 final int count = mChildrenCount; 4602 final View[] children = mChildren; 4603 for (int i = 0; i < count; i++) { 4604 if (!children[i].dispatchConsistencyCheck(consistency)) result = false; 4605 } 4606 4607 return result; 4608 } 4609 4610 /** 4611 * @hide 4612 */ 4613 @Override 4614 protected boolean onConsistencyCheck(int consistency) { 4615 boolean result = super.onConsistencyCheck(consistency); 4616 4617 final boolean checkLayout = (consistency & ViewDebug.CONSISTENCY_LAYOUT) != 0; 4618 final boolean checkDrawing = (consistency & ViewDebug.CONSISTENCY_DRAWING) != 0; 4619 4620 if (checkLayout) { 4621 final int count = mChildrenCount; 4622 final View[] children = mChildren; 4623 for (int i = 0; i < count; i++) { 4624 if (children[i].getParent() != this) { 4625 result = false; 4626 android.util.Log.d(ViewDebug.CONSISTENCY_LOG_TAG, 4627 "View " + children[i] + " has no parent/a parent that is not " + this); 4628 } 4629 } 4630 } 4631 4632 if (checkDrawing) { 4633 // If this group is dirty, check that the parent is dirty as well 4634 if ((mPrivateFlags & DIRTY_MASK) != 0) { 4635 final ViewParent parent = getParent(); 4636 if (parent != null && !(parent instanceof ViewRootImpl)) { 4637 if ((((View) parent).mPrivateFlags & DIRTY_MASK) == 0) { 4638 result = false; 4639 android.util.Log.d(ViewDebug.CONSISTENCY_LOG_TAG, 4640 "ViewGroup " + this + " is dirty but its parent is not: " + this); 4641 } 4642 } 4643 } 4644 } 4645 4646 return result; 4647 } 4648 4649 /** 4650 * {@inheritDoc} 4651 */ 4652 @Override 4653 protected void debug(int depth) { 4654 super.debug(depth); 4655 String output; 4656 4657 if (mFocused != null) { 4658 output = debugIndent(depth); 4659 output += "mFocused"; 4660 Log.d(VIEW_LOG_TAG, output); 4661 } 4662 if (mChildrenCount != 0) { 4663 output = debugIndent(depth); 4664 output += "{"; 4665 Log.d(VIEW_LOG_TAG, output); 4666 } 4667 int count = mChildrenCount; 4668 for (int i = 0; i < count; i++) { 4669 View child = mChildren[i]; 4670 child.debug(depth + 1); 4671 } 4672 4673 if (mChildrenCount != 0) { 4674 output = debugIndent(depth); 4675 output += "}"; 4676 Log.d(VIEW_LOG_TAG, output); 4677 } 4678 } 4679 4680 /** 4681 * Returns the position in the group of the specified child view. 4682 * 4683 * @param child the view for which to get the position 4684 * @return a positive integer representing the position of the view in the 4685 * group, or -1 if the view does not exist in the group 4686 */ 4687 public int indexOfChild(View child) { 4688 final int count = mChildrenCount; 4689 final View[] children = mChildren; 4690 for (int i = 0; i < count; i++) { 4691 if (children[i] == child) { 4692 return i; 4693 } 4694 } 4695 return -1; 4696 } 4697 4698 /** 4699 * Returns the number of children in the group. 4700 * 4701 * @return a positive integer representing the number of children in 4702 * the group 4703 */ 4704 public int getChildCount() { 4705 return mChildrenCount; 4706 } 4707 4708 /** 4709 * Returns the view at the specified position in the group. 4710 * 4711 * @param index the position at which to get the view from 4712 * @return the view at the specified position or null if the position 4713 * does not exist within the group 4714 */ 4715 public View getChildAt(int index) { 4716 if (index < 0 || index >= mChildrenCount) { 4717 return null; 4718 } 4719 return mChildren[index]; 4720 } 4721 4722 /** 4723 * Ask all of the children of this view to measure themselves, taking into 4724 * account both the MeasureSpec requirements for this view and its padding. 4725 * We skip children that are in the GONE state The heavy lifting is done in 4726 * getChildMeasureSpec. 4727 * 4728 * @param widthMeasureSpec The width requirements for this view 4729 * @param heightMeasureSpec The height requirements for this view 4730 */ 4731 protected void measureChildren(int widthMeasureSpec, int heightMeasureSpec) { 4732 final int size = mChildrenCount; 4733 final View[] children = mChildren; 4734 for (int i = 0; i < size; ++i) { 4735 final View child = children[i]; 4736 if ((child.mViewFlags & VISIBILITY_MASK) != GONE) { 4737 measureChild(child, widthMeasureSpec, heightMeasureSpec); 4738 } 4739 } 4740 } 4741 4742 /** 4743 * Ask one of the children of this view to measure itself, taking into 4744 * account both the MeasureSpec requirements for this view and its padding. 4745 * The heavy lifting is done in getChildMeasureSpec. 4746 * 4747 * @param child The child to measure 4748 * @param parentWidthMeasureSpec The width requirements for this view 4749 * @param parentHeightMeasureSpec The height requirements for this view 4750 */ 4751 protected void measureChild(View child, int parentWidthMeasureSpec, 4752 int parentHeightMeasureSpec) { 4753 final LayoutParams lp = child.getLayoutParams(); 4754 4755 final int childWidthMeasureSpec = getChildMeasureSpec(parentWidthMeasureSpec, 4756 mPaddingLeft + mPaddingRight, lp.width); 4757 final int childHeightMeasureSpec = getChildMeasureSpec(parentHeightMeasureSpec, 4758 mPaddingTop + mPaddingBottom, lp.height); 4759 4760 child.measure(childWidthMeasureSpec, childHeightMeasureSpec); 4761 } 4762 4763 /** 4764 * Ask one of the children of this view to measure itself, taking into 4765 * account both the MeasureSpec requirements for this view and its padding 4766 * and margins. The child must have MarginLayoutParams The heavy lifting is 4767 * done in getChildMeasureSpec. 4768 * 4769 * @param child The child to measure 4770 * @param parentWidthMeasureSpec The width requirements for this view 4771 * @param widthUsed Extra space that has been used up by the parent 4772 * horizontally (possibly by other children of the parent) 4773 * @param parentHeightMeasureSpec The height requirements for this view 4774 * @param heightUsed Extra space that has been used up by the parent 4775 * vertically (possibly by other children of the parent) 4776 */ 4777 protected void measureChildWithMargins(View child, 4778 int parentWidthMeasureSpec, int widthUsed, 4779 int parentHeightMeasureSpec, int heightUsed) { 4780 final MarginLayoutParams lp = (MarginLayoutParams) child.getLayoutParams(); 4781 4782 final int childWidthMeasureSpec = getChildMeasureSpec(parentWidthMeasureSpec, 4783 mPaddingLeft + mPaddingRight + lp.leftMargin + lp.rightMargin 4784 + widthUsed, lp.width); 4785 final int childHeightMeasureSpec = getChildMeasureSpec(parentHeightMeasureSpec, 4786 mPaddingTop + mPaddingBottom + lp.topMargin + lp.bottomMargin 4787 + heightUsed, lp.height); 4788 4789 child.measure(childWidthMeasureSpec, childHeightMeasureSpec); 4790 } 4791 4792 /** 4793 * Does the hard part of measureChildren: figuring out the MeasureSpec to 4794 * pass to a particular child. This method figures out the right MeasureSpec 4795 * for one dimension (height or width) of one child view. 4796 * 4797 * The goal is to combine information from our MeasureSpec with the 4798 * LayoutParams of the child to get the best possible results. For example, 4799 * if the this view knows its size (because its MeasureSpec has a mode of 4800 * EXACTLY), and the child has indicated in its LayoutParams that it wants 4801 * to be the same size as the parent, the parent should ask the child to 4802 * layout given an exact size. 4803 * 4804 * @param spec The requirements for this view 4805 * @param padding The padding of this view for the current dimension and 4806 * margins, if applicable 4807 * @param childDimension How big the child wants to be in the current 4808 * dimension 4809 * @return a MeasureSpec integer for the child 4810 */ 4811 public static int getChildMeasureSpec(int spec, int padding, int childDimension) { 4812 int specMode = MeasureSpec.getMode(spec); 4813 int specSize = MeasureSpec.getSize(spec); 4814 4815 int size = Math.max(0, specSize - padding); 4816 4817 int resultSize = 0; 4818 int resultMode = 0; 4819 4820 switch (specMode) { 4821 // Parent has imposed an exact size on us 4822 case MeasureSpec.EXACTLY: 4823 if (childDimension >= 0) { 4824 resultSize = childDimension; 4825 resultMode = MeasureSpec.EXACTLY; 4826 } else if (childDimension == LayoutParams.MATCH_PARENT) { 4827 // Child wants to be our size. So be it. 4828 resultSize = size; 4829 resultMode = MeasureSpec.EXACTLY; 4830 } else if (childDimension == LayoutParams.WRAP_CONTENT) { 4831 // Child wants to determine its own size. It can't be 4832 // bigger than us. 4833 resultSize = size; 4834 resultMode = MeasureSpec.AT_MOST; 4835 } 4836 break; 4837 4838 // Parent has imposed a maximum size on us 4839 case MeasureSpec.AT_MOST: 4840 if (childDimension >= 0) { 4841 // Child wants a specific size... so be it 4842 resultSize = childDimension; 4843 resultMode = MeasureSpec.EXACTLY; 4844 } else if (childDimension == LayoutParams.MATCH_PARENT) { 4845 // Child wants to be our size, but our size is not fixed. 4846 // Constrain child to not be bigger than us. 4847 resultSize = size; 4848 resultMode = MeasureSpec.AT_MOST; 4849 } else if (childDimension == LayoutParams.WRAP_CONTENT) { 4850 // Child wants to determine its own size. It can't be 4851 // bigger than us. 4852 resultSize = size; 4853 resultMode = MeasureSpec.AT_MOST; 4854 } 4855 break; 4856 4857 // Parent asked to see how big we want to be 4858 case MeasureSpec.UNSPECIFIED: 4859 if (childDimension >= 0) { 4860 // Child wants a specific size... let him have it 4861 resultSize = childDimension; 4862 resultMode = MeasureSpec.EXACTLY; 4863 } else if (childDimension == LayoutParams.MATCH_PARENT) { 4864 // Child wants to be our size... find out how big it should 4865 // be 4866 resultSize = 0; 4867 resultMode = MeasureSpec.UNSPECIFIED; 4868 } else if (childDimension == LayoutParams.WRAP_CONTENT) { 4869 // Child wants to determine its own size.... find out how 4870 // big it should be 4871 resultSize = 0; 4872 resultMode = MeasureSpec.UNSPECIFIED; 4873 } 4874 break; 4875 } 4876 return MeasureSpec.makeMeasureSpec(resultSize, resultMode); 4877 } 4878 4879 4880 /** 4881 * Removes any pending animations for views that have been removed. Call 4882 * this if you don't want animations for exiting views to stack up. 4883 */ 4884 public void clearDisappearingChildren() { 4885 if (mDisappearingChildren != null) { 4886 mDisappearingChildren.clear(); 4887 invalidate(); 4888 } 4889 } 4890 4891 /** 4892 * Add a view which is removed from mChildren but still needs animation 4893 * 4894 * @param v View to add 4895 */ 4896 private void addDisappearingView(View v) { 4897 ArrayList<View> disappearingChildren = mDisappearingChildren; 4898 4899 if (disappearingChildren == null) { 4900 disappearingChildren = mDisappearingChildren = new ArrayList<View>(); 4901 } 4902 4903 disappearingChildren.add(v); 4904 } 4905 4906 /** 4907 * Cleanup a view when its animation is done. This may mean removing it from 4908 * the list of disappearing views. 4909 * 4910 * @param view The view whose animation has finished 4911 * @param animation The animation, cannot be null 4912 */ 4913 void finishAnimatingView(final View view, Animation animation) { 4914 final ArrayList<View> disappearingChildren = mDisappearingChildren; 4915 if (disappearingChildren != null) { 4916 if (disappearingChildren.contains(view)) { 4917 disappearingChildren.remove(view); 4918 4919 if (view.mAttachInfo != null) { 4920 view.dispatchDetachedFromWindow(); 4921 } 4922 4923 view.clearAnimation(); 4924 mGroupFlags |= FLAG_INVALIDATE_REQUIRED; 4925 } 4926 } 4927 4928 if (animation != null && !animation.getFillAfter()) { 4929 view.clearAnimation(); 4930 } 4931 4932 if ((view.mPrivateFlags & ANIMATION_STARTED) == ANIMATION_STARTED) { 4933 view.onAnimationEnd(); 4934 // Should be performed by onAnimationEnd() but this avoid an infinite loop, 4935 // so we'd rather be safe than sorry 4936 view.mPrivateFlags &= ~ANIMATION_STARTED; 4937 // Draw one more frame after the animation is done 4938 mGroupFlags |= FLAG_INVALIDATE_REQUIRED; 4939 } 4940 } 4941 4942 /** 4943 * Utility function called by View during invalidation to determine whether a view that 4944 * is invisible or gone should still be invalidated because it is being transitioned (and 4945 * therefore still needs to be drawn). 4946 */ 4947 boolean isViewTransitioning(View view) { 4948 return (mTransitioningViews != null && mTransitioningViews.contains(view)); 4949 } 4950 4951 /** 4952 * This method tells the ViewGroup that the given View object, which should have this 4953 * ViewGroup as its parent, 4954 * should be kept around (re-displayed when the ViewGroup draws its children) even if it 4955 * is removed from its parent. This allows animations, such as those used by 4956 * {@link android.app.Fragment} and {@link android.animation.LayoutTransition} to animate 4957 * the removal of views. A call to this method should always be accompanied by a later call 4958 * to {@link #endViewTransition(View)}, such as after an animation on the View has finished, 4959 * so that the View finally gets removed. 4960 * 4961 * @param view The View object to be kept visible even if it gets removed from its parent. 4962 */ 4963 public void startViewTransition(View view) { 4964 if (view.mParent == this) { 4965 if (mTransitioningViews == null) { 4966 mTransitioningViews = new ArrayList<View>(); 4967 } 4968 mTransitioningViews.add(view); 4969 } 4970 } 4971 4972 /** 4973 * This method should always be called following an earlier call to 4974 * {@link #startViewTransition(View)}. The given View is finally removed from its parent 4975 * and will no longer be displayed. Note that this method does not perform the functionality 4976 * of removing a view from its parent; it just discontinues the display of a View that 4977 * has previously been removed. 4978 * 4979 * @return view The View object that has been removed but is being kept around in the visible 4980 * hierarchy by an earlier call to {@link #startViewTransition(View)}. 4981 */ 4982 public void endViewTransition(View view) { 4983 if (mTransitioningViews != null) { 4984 mTransitioningViews.remove(view); 4985 final ArrayList<View> disappearingChildren = mDisappearingChildren; 4986 if (disappearingChildren != null && disappearingChildren.contains(view)) { 4987 disappearingChildren.remove(view); 4988 if (mVisibilityChangingChildren != null && 4989 mVisibilityChangingChildren.contains(view)) { 4990 mVisibilityChangingChildren.remove(view); 4991 } else { 4992 if (view.mAttachInfo != null) { 4993 view.dispatchDetachedFromWindow(); 4994 } 4995 if (view.mParent != null) { 4996 view.mParent = null; 4997 } 4998 } 4999 invalidate(); 5000 } 5001 } 5002 } 5003 5004 private LayoutTransition.TransitionListener mLayoutTransitionListener = 5005 new LayoutTransition.TransitionListener() { 5006 @Override 5007 public void startTransition(LayoutTransition transition, ViewGroup container, 5008 View view, int transitionType) { 5009 // We only care about disappearing items, since we need special logic to keep 5010 // those items visible after they've been 'removed' 5011 if (transitionType == LayoutTransition.DISAPPEARING) { 5012 startViewTransition(view); 5013 } 5014 } 5015 5016 @Override 5017 public void endTransition(LayoutTransition transition, ViewGroup container, 5018 View view, int transitionType) { 5019 if (mLayoutSuppressed && !transition.isChangingLayout()) { 5020 requestLayout(); 5021 mLayoutSuppressed = false; 5022 } 5023 if (transitionType == LayoutTransition.DISAPPEARING && mTransitioningViews != null) { 5024 endViewTransition(view); 5025 } 5026 } 5027 }; 5028 5029 /** 5030 * {@inheritDoc} 5031 */ 5032 @Override 5033 public boolean gatherTransparentRegion(Region region) { 5034 // If no transparent regions requested, we are always opaque. 5035 final boolean meOpaque = (mPrivateFlags & View.REQUEST_TRANSPARENT_REGIONS) == 0; 5036 if (meOpaque && region == null) { 5037 // The caller doesn't care about the region, so stop now. 5038 return true; 5039 } 5040 super.gatherTransparentRegion(region); 5041 final View[] children = mChildren; 5042 final int count = mChildrenCount; 5043 boolean noneOfTheChildrenAreTransparent = true; 5044 for (int i = 0; i < count; i++) { 5045 final View child = children[i]; 5046 if ((child.mViewFlags & VISIBILITY_MASK) == VISIBLE || child.getAnimation() != null) { 5047 if (!child.gatherTransparentRegion(region)) { 5048 noneOfTheChildrenAreTransparent = false; 5049 } 5050 } 5051 } 5052 return meOpaque || noneOfTheChildrenAreTransparent; 5053 } 5054 5055 /** 5056 * {@inheritDoc} 5057 */ 5058 public void requestTransparentRegion(View child) { 5059 if (child != null) { 5060 child.mPrivateFlags |= View.REQUEST_TRANSPARENT_REGIONS; 5061 if (mParent != null) { 5062 mParent.requestTransparentRegion(this); 5063 } 5064 } 5065 } 5066 5067 5068 @Override 5069 protected boolean fitSystemWindows(Rect insets) { 5070 boolean done = super.fitSystemWindows(insets); 5071 if (!done) { 5072 final int count = mChildrenCount; 5073 final View[] children = mChildren; 5074 for (int i = 0; i < count; i++) { 5075 done = children[i].fitSystemWindows(insets); 5076 if (done) { 5077 break; 5078 } 5079 } 5080 } 5081 return done; 5082 } 5083 5084 /** 5085 * Returns the animation listener to which layout animation events are 5086 * sent. 5087 * 5088 * @return an {@link android.view.animation.Animation.AnimationListener} 5089 */ 5090 public Animation.AnimationListener getLayoutAnimationListener() { 5091 return mAnimationListener; 5092 } 5093 5094 @Override 5095 protected void drawableStateChanged() { 5096 super.drawableStateChanged(); 5097 5098 if ((mGroupFlags & FLAG_NOTIFY_CHILDREN_ON_DRAWABLE_STATE_CHANGE) != 0) { 5099 if ((mGroupFlags & FLAG_ADD_STATES_FROM_CHILDREN) != 0) { 5100 throw new IllegalStateException("addStateFromChildren cannot be enabled if a" 5101 + " child has duplicateParentState set to true"); 5102 } 5103 5104 final View[] children = mChildren; 5105 final int count = mChildrenCount; 5106 5107 for (int i = 0; i < count; i++) { 5108 final View child = children[i]; 5109 if ((child.mViewFlags & DUPLICATE_PARENT_STATE) != 0) { 5110 child.refreshDrawableState(); 5111 } 5112 } 5113 } 5114 } 5115 5116 @Override 5117 public void jumpDrawablesToCurrentState() { 5118 super.jumpDrawablesToCurrentState(); 5119 final View[] children = mChildren; 5120 final int count = mChildrenCount; 5121 for (int i = 0; i < count; i++) { 5122 children[i].jumpDrawablesToCurrentState(); 5123 } 5124 } 5125 5126 @Override 5127 protected int[] onCreateDrawableState(int extraSpace) { 5128 if ((mGroupFlags & FLAG_ADD_STATES_FROM_CHILDREN) == 0) { 5129 return super.onCreateDrawableState(extraSpace); 5130 } 5131 5132 int need = 0; 5133 int n = getChildCount(); 5134 for (int i = 0; i < n; i++) { 5135 int[] childState = getChildAt(i).getDrawableState(); 5136 5137 if (childState != null) { 5138 need += childState.length; 5139 } 5140 } 5141 5142 int[] state = super.onCreateDrawableState(extraSpace + need); 5143 5144 for (int i = 0; i < n; i++) { 5145 int[] childState = getChildAt(i).getDrawableState(); 5146 5147 if (childState != null) { 5148 state = mergeDrawableStates(state, childState); 5149 } 5150 } 5151 5152 return state; 5153 } 5154 5155 /** 5156 * Sets whether this ViewGroup's drawable states also include 5157 * its children's drawable states. This is used, for example, to 5158 * make a group appear to be focused when its child EditText or button 5159 * is focused. 5160 */ 5161 public void setAddStatesFromChildren(boolean addsStates) { 5162 if (addsStates) { 5163 mGroupFlags |= FLAG_ADD_STATES_FROM_CHILDREN; 5164 } else { 5165 mGroupFlags &= ~FLAG_ADD_STATES_FROM_CHILDREN; 5166 } 5167 5168 refreshDrawableState(); 5169 } 5170 5171 /** 5172 * Returns whether this ViewGroup's drawable states also include 5173 * its children's drawable states. This is used, for example, to 5174 * make a group appear to be focused when its child EditText or button 5175 * is focused. 5176 */ 5177 public boolean addStatesFromChildren() { 5178 return (mGroupFlags & FLAG_ADD_STATES_FROM_CHILDREN) != 0; 5179 } 5180 5181 /** 5182 * If {link #addStatesFromChildren} is true, refreshes this group's 5183 * drawable state (to include the states from its children). 5184 */ 5185 public void childDrawableStateChanged(View child) { 5186 if ((mGroupFlags & FLAG_ADD_STATES_FROM_CHILDREN) != 0) { 5187 refreshDrawableState(); 5188 } 5189 } 5190 5191 /** 5192 * Specifies the animation listener to which layout animation events must 5193 * be sent. Only 5194 * {@link android.view.animation.Animation.AnimationListener#onAnimationStart(Animation)} 5195 * and 5196 * {@link android.view.animation.Animation.AnimationListener#onAnimationEnd(Animation)} 5197 * are invoked. 5198 * 5199 * @param animationListener the layout animation listener 5200 */ 5201 public void setLayoutAnimationListener(Animation.AnimationListener animationListener) { 5202 mAnimationListener = animationListener; 5203 } 5204 5205 /** 5206 * This method is called by LayoutTransition when there are 'changing' animations that need 5207 * to start after the layout/setup phase. The request is forwarded to the ViewAncestor, who 5208 * starts all pending transitions prior to the drawing phase in the current traversal. 5209 * 5210 * @param transition The LayoutTransition to be started on the next traversal. 5211 * 5212 * @hide 5213 */ 5214 public void requestTransitionStart(LayoutTransition transition) { 5215 ViewRootImpl viewAncestor = getViewRootImpl(); 5216 if (viewAncestor != null) { 5217 viewAncestor.requestTransitionStart(transition); 5218 } 5219 } 5220 5221 @Override 5222 public void onResolvedLayoutDirectionReset() { 5223 // Take care of resetting the children resolution too 5224 final int count = getChildCount(); 5225 for (int i = 0; i < count; i++) { 5226 final View child = getChildAt(i); 5227 if (child.getLayoutDirection() == LAYOUT_DIRECTION_INHERIT) { 5228 child.resetResolvedLayoutDirection(); 5229 } 5230 } 5231 } 5232 5233 @Override 5234 public void onResolvedTextDirectionReset() { 5235 // Take care of resetting the children resolution too 5236 final int count = getChildCount(); 5237 for (int i = 0; i < count; i++) { 5238 final View child = getChildAt(i); 5239 if (child.getTextDirection() == TEXT_DIRECTION_INHERIT) { 5240 child.resetResolvedTextDirection(); 5241 } 5242 } 5243 } 5244 5245 @Override 5246 public void onResolvedTextAlignmentReset() { 5247 // Take care of resetting the children resolution too 5248 final int count = getChildCount(); 5249 for (int i = 0; i < count; i++) { 5250 final View child = getChildAt(i); 5251 if (child.getTextAlignment() == TEXT_ALIGNMENT_INHERIT) { 5252 child.resetResolvedTextAlignment(); 5253 } 5254 } 5255 } 5256 5257 /** 5258 * Return true if the pressed state should be delayed for children or descendants of this 5259 * ViewGroup. Generally, this should be done for containers that can scroll, such as a List. 5260 * This prevents the pressed state from appearing when the user is actually trying to scroll 5261 * the content. 5262 * 5263 * The default implementation returns true for compatibility reasons. Subclasses that do 5264 * not scroll should generally override this method and return false. 5265 */ 5266 public boolean shouldDelayChildPressedState() { 5267 return true; 5268 } 5269 5270 /** @hide */ 5271 protected void onSetLayoutParams(View child, LayoutParams layoutParams) { 5272 } 5273 5274 /** 5275 * LayoutParams are used by views to tell their parents how they want to be 5276 * laid out. See 5277 * {@link android.R.styleable#ViewGroup_Layout ViewGroup Layout Attributes} 5278 * for a list of all child view attributes that this class supports. 5279 * 5280 * <p> 5281 * The base LayoutParams class just describes how big the view wants to be 5282 * for both width and height. For each dimension, it can specify one of: 5283 * <ul> 5284 * <li>FILL_PARENT (renamed MATCH_PARENT in API Level 8 and higher), which 5285 * means that the view wants to be as big as its parent (minus padding) 5286 * <li> WRAP_CONTENT, which means that the view wants to be just big enough 5287 * to enclose its content (plus padding) 5288 * <li> an exact number 5289 * </ul> 5290 * There are subclasses of LayoutParams for different subclasses of 5291 * ViewGroup. For example, AbsoluteLayout has its own subclass of 5292 * LayoutParams which adds an X and Y value.</p> 5293 * 5294 * <div class="special reference"> 5295 * <h3>Developer Guides</h3> 5296 * <p>For more information about creating user interface layouts, read the 5297 * <a href="{@docRoot}guide/topics/ui/declaring-layout.html">XML Layouts</a> developer 5298 * guide.</p></div> 5299 * 5300 * @attr ref android.R.styleable#ViewGroup_Layout_layout_height 5301 * @attr ref android.R.styleable#ViewGroup_Layout_layout_width 5302 */ 5303 public static class LayoutParams { 5304 /** 5305 * Special value for the height or width requested by a View. 5306 * FILL_PARENT means that the view wants to be as big as its parent, 5307 * minus the parent's padding, if any. This value is deprecated 5308 * starting in API Level 8 and replaced by {@link #MATCH_PARENT}. 5309 */ 5310 @SuppressWarnings({"UnusedDeclaration"}) 5311 @Deprecated 5312 public static final int FILL_PARENT = -1; 5313 5314 /** 5315 * Special value for the height or width requested by a View. 5316 * MATCH_PARENT means that the view wants to be as big as its parent, 5317 * minus the parent's padding, if any. Introduced in API Level 8. 5318 */ 5319 public static final int MATCH_PARENT = -1; 5320 5321 /** 5322 * Special value for the height or width requested by a View. 5323 * WRAP_CONTENT means that the view wants to be just large enough to fit 5324 * its own internal content, taking its own padding into account. 5325 */ 5326 public static final int WRAP_CONTENT = -2; 5327 5328 /** 5329 * Information about how wide the view wants to be. Can be one of the 5330 * constants FILL_PARENT (replaced by MATCH_PARENT , 5331 * in API Level 8) or WRAP_CONTENT. or an exact size. 5332 */ 5333 @ViewDebug.ExportedProperty(category = "layout", mapping = { 5334 @ViewDebug.IntToString(from = MATCH_PARENT, to = "MATCH_PARENT"), 5335 @ViewDebug.IntToString(from = WRAP_CONTENT, to = "WRAP_CONTENT") 5336 }) 5337 public int width; 5338 5339 /** 5340 * Information about how tall the view wants to be. Can be one of the 5341 * constants FILL_PARENT (replaced by MATCH_PARENT , 5342 * in API Level 8) or WRAP_CONTENT. or an exact size. 5343 */ 5344 @ViewDebug.ExportedProperty(category = "layout", mapping = { 5345 @ViewDebug.IntToString(from = MATCH_PARENT, to = "MATCH_PARENT"), 5346 @ViewDebug.IntToString(from = WRAP_CONTENT, to = "WRAP_CONTENT") 5347 }) 5348 public int height; 5349 5350 /** 5351 * Used to animate layouts. 5352 */ 5353 public LayoutAnimationController.AnimationParameters layoutAnimationParameters; 5354 5355 /** 5356 * Creates a new set of layout parameters. The values are extracted from 5357 * the supplied attributes set and context. The XML attributes mapped 5358 * to this set of layout parameters are: 5359 * 5360 * <ul> 5361 * <li><code>layout_width</code>: the width, either an exact value, 5362 * {@link #WRAP_CONTENT}, or {@link #FILL_PARENT} (replaced by 5363 * {@link #MATCH_PARENT} in API Level 8)</li> 5364 * <li><code>layout_height</code>: the height, either an exact value, 5365 * {@link #WRAP_CONTENT}, or {@link #FILL_PARENT} (replaced by 5366 * {@link #MATCH_PARENT} in API Level 8)</li> 5367 * </ul> 5368 * 5369 * @param c the application environment 5370 * @param attrs the set of attributes from which to extract the layout 5371 * parameters' values 5372 */ 5373 public LayoutParams(Context c, AttributeSet attrs) { 5374 TypedArray a = c.obtainStyledAttributes(attrs, R.styleable.ViewGroup_Layout); 5375 setBaseAttributes(a, 5376 R.styleable.ViewGroup_Layout_layout_width, 5377 R.styleable.ViewGroup_Layout_layout_height); 5378 a.recycle(); 5379 } 5380 5381 /** 5382 * Creates a new set of layout parameters with the specified width 5383 * and height. 5384 * 5385 * @param width the width, either {@link #WRAP_CONTENT}, 5386 * {@link #FILL_PARENT} (replaced by {@link #MATCH_PARENT} in 5387 * API Level 8), or a fixed size in pixels 5388 * @param height the height, either {@link #WRAP_CONTENT}, 5389 * {@link #FILL_PARENT} (replaced by {@link #MATCH_PARENT} in 5390 * API Level 8), or a fixed size in pixels 5391 */ 5392 public LayoutParams(int width, int height) { 5393 this.width = width; 5394 this.height = height; 5395 } 5396 5397 /** 5398 * Copy constructor. Clones the width and height values of the source. 5399 * 5400 * @param source The layout params to copy from. 5401 */ 5402 public LayoutParams(LayoutParams source) { 5403 this.width = source.width; 5404 this.height = source.height; 5405 } 5406 5407 /** 5408 * Used internally by MarginLayoutParams. 5409 * @hide 5410 */ 5411 LayoutParams() { 5412 } 5413 5414 /** 5415 * Extracts the layout parameters from the supplied attributes. 5416 * 5417 * @param a the style attributes to extract the parameters from 5418 * @param widthAttr the identifier of the width attribute 5419 * @param heightAttr the identifier of the height attribute 5420 */ 5421 protected void setBaseAttributes(TypedArray a, int widthAttr, int heightAttr) { 5422 width = a.getLayoutDimension(widthAttr, "layout_width"); 5423 height = a.getLayoutDimension(heightAttr, "layout_height"); 5424 } 5425 5426 /** 5427 * Resolve layout parameters depending on the layout direction. Subclasses that care about 5428 * layoutDirection changes should override this method. The default implementation does 5429 * nothing. 5430 * 5431 * @param layoutDirection the direction of the layout 5432 * 5433 * {@link View#LAYOUT_DIRECTION_LTR} 5434 * {@link View#LAYOUT_DIRECTION_RTL} 5435 */ 5436 public void onResolveLayoutDirection(int layoutDirection) { 5437 } 5438 5439 /** 5440 * Returns a String representation of this set of layout parameters. 5441 * 5442 * @param output the String to prepend to the internal representation 5443 * @return a String with the following format: output + 5444 * "ViewGroup.LayoutParams={ width=WIDTH, height=HEIGHT }" 5445 * 5446 * @hide 5447 */ 5448 public String debug(String output) { 5449 return output + "ViewGroup.LayoutParams={ width=" 5450 + sizeToString(width) + ", height=" + sizeToString(height) + " }"; 5451 } 5452 5453 /** 5454 * Use {@code canvas} to draw suitable debugging annotations for these LayoutParameters. 5455 * 5456 * @param view the view that contains these layout parameters 5457 * @param canvas the canvas on which to draw 5458 * 5459 * @hide 5460 */ 5461 public void onDebugDraw(View view, Canvas canvas) { 5462 } 5463 5464 /** 5465 * Converts the specified size to a readable String. 5466 * 5467 * @param size the size to convert 5468 * @return a String instance representing the supplied size 5469 * 5470 * @hide 5471 */ 5472 protected static String sizeToString(int size) { 5473 if (size == WRAP_CONTENT) { 5474 return "wrap-content"; 5475 } 5476 if (size == MATCH_PARENT) { 5477 return "match-parent"; 5478 } 5479 return String.valueOf(size); 5480 } 5481 } 5482 5483 /** 5484 * Per-child layout information for layouts that support margins. 5485 * See 5486 * {@link android.R.styleable#ViewGroup_MarginLayout ViewGroup Margin Layout Attributes} 5487 * for a list of all child view attributes that this class supports. 5488 */ 5489 public static class MarginLayoutParams extends ViewGroup.LayoutParams { 5490 /** 5491 * The left margin in pixels of the child. 5492 * Call {@link ViewGroup#setLayoutParams(LayoutParams)} after reassigning a new value 5493 * to this field. 5494 */ 5495 @ViewDebug.ExportedProperty(category = "layout") 5496 public int leftMargin; 5497 5498 /** 5499 * The top margin in pixels of the child. 5500 * Call {@link ViewGroup#setLayoutParams(LayoutParams)} after reassigning a new value 5501 * to this field. 5502 */ 5503 @ViewDebug.ExportedProperty(category = "layout") 5504 public int topMargin; 5505 5506 /** 5507 * The right margin in pixels of the child. 5508 * Call {@link ViewGroup#setLayoutParams(LayoutParams)} after reassigning a new value 5509 * to this field. 5510 */ 5511 @ViewDebug.ExportedProperty(category = "layout") 5512 public int rightMargin; 5513 5514 /** 5515 * The bottom margin in pixels of the child. 5516 * Call {@link ViewGroup#setLayoutParams(LayoutParams)} after reassigning a new value 5517 * to this field. 5518 */ 5519 @ViewDebug.ExportedProperty(category = "layout") 5520 public int bottomMargin; 5521 5522 /** 5523 * The start margin in pixels of the child. 5524 * Call {@link ViewGroup#setLayoutParams(LayoutParams)} after reassigning a new value 5525 * to this field. 5526 */ 5527 @ViewDebug.ExportedProperty(category = "layout") 5528 public int startMargin = DEFAULT_RELATIVE; 5529 5530 /** 5531 * The end margin in pixels of the child. 5532 * Call {@link ViewGroup#setLayoutParams(LayoutParams)} after reassigning a new value 5533 * to this field. 5534 */ 5535 @ViewDebug.ExportedProperty(category = "layout") 5536 public int endMargin = DEFAULT_RELATIVE; 5537 5538 /** 5539 * The default start and end margin. 5540 */ 5541 static private final int DEFAULT_RELATIVE = Integer.MIN_VALUE; 5542 5543 /** 5544 * Creates a new set of layout parameters. The values are extracted from 5545 * the supplied attributes set and context. 5546 * 5547 * @param c the application environment 5548 * @param attrs the set of attributes from which to extract the layout 5549 * parameters' values 5550 */ 5551 public MarginLayoutParams(Context c, AttributeSet attrs) { 5552 super(); 5553 5554 TypedArray a = c.obtainStyledAttributes(attrs, R.styleable.ViewGroup_MarginLayout); 5555 setBaseAttributes(a, 5556 R.styleable.ViewGroup_MarginLayout_layout_width, 5557 R.styleable.ViewGroup_MarginLayout_layout_height); 5558 5559 int margin = a.getDimensionPixelSize( 5560 com.android.internal.R.styleable.ViewGroup_MarginLayout_layout_margin, -1); 5561 if (margin >= 0) { 5562 leftMargin = margin; 5563 topMargin = margin; 5564 rightMargin= margin; 5565 bottomMargin = margin; 5566 } else { 5567 leftMargin = a.getDimensionPixelSize( 5568 R.styleable.ViewGroup_MarginLayout_layout_marginLeft, 0); 5569 topMargin = a.getDimensionPixelSize( 5570 R.styleable.ViewGroup_MarginLayout_layout_marginTop, 0); 5571 rightMargin = a.getDimensionPixelSize( 5572 R.styleable.ViewGroup_MarginLayout_layout_marginRight, 0); 5573 bottomMargin = a.getDimensionPixelSize( 5574 R.styleable.ViewGroup_MarginLayout_layout_marginBottom, 0); 5575 startMargin = a.getDimensionPixelSize( 5576 R.styleable.ViewGroup_MarginLayout_layout_marginStart, DEFAULT_RELATIVE); 5577 endMargin = a.getDimensionPixelSize( 5578 R.styleable.ViewGroup_MarginLayout_layout_marginEnd, DEFAULT_RELATIVE); 5579 } 5580 5581 a.recycle(); 5582 } 5583 5584 /** 5585 * {@inheritDoc} 5586 */ 5587 public MarginLayoutParams(int width, int height) { 5588 super(width, height); 5589 } 5590 5591 /** 5592 * Copy constructor. Clones the width, height and margin values of the source. 5593 * 5594 * @param source The layout params to copy from. 5595 */ 5596 public MarginLayoutParams(MarginLayoutParams source) { 5597 this.width = source.width; 5598 this.height = source.height; 5599 5600 this.leftMargin = source.leftMargin; 5601 this.topMargin = source.topMargin; 5602 this.rightMargin = source.rightMargin; 5603 this.bottomMargin = source.bottomMargin; 5604 this.startMargin = source.startMargin; 5605 this.endMargin = source.endMargin; 5606 } 5607 5608 /** 5609 * {@inheritDoc} 5610 */ 5611 public MarginLayoutParams(LayoutParams source) { 5612 super(source); 5613 } 5614 5615 /** 5616 * Sets the margins, in pixels. A call to {@link android.view.View#requestLayout()} needs 5617 * to be done so that the new margins are taken into account. Left and right margins may be 5618 * overriden by {@link android.view.View#requestLayout()} depending on layout direction. 5619 * 5620 * @param left the left margin size 5621 * @param top the top margin size 5622 * @param right the right margin size 5623 * @param bottom the bottom margin size 5624 * 5625 * @attr ref android.R.styleable#ViewGroup_MarginLayout_layout_marginLeft 5626 * @attr ref android.R.styleable#ViewGroup_MarginLayout_layout_marginTop 5627 * @attr ref android.R.styleable#ViewGroup_MarginLayout_layout_marginRight 5628 * @attr ref android.R.styleable#ViewGroup_MarginLayout_layout_marginBottom 5629 */ 5630 public void setMargins(int left, int top, int right, int bottom) { 5631 leftMargin = left; 5632 topMargin = top; 5633 rightMargin = right; 5634 bottomMargin = bottom; 5635 } 5636 5637 /** 5638 * Sets the relative margins, in pixels. A call to {@link android.view.View#requestLayout()} 5639 * needs to be done so that the new relative margins are taken into account. Left and right 5640 * margins may be overriden by {@link android.view.View#requestLayout()} depending on layout 5641 * direction. 5642 * 5643 * @param start the start margin size 5644 * @param top the top margin size 5645 * @param end the right margin size 5646 * @param bottom the bottom margin size 5647 * 5648 * @attr ref android.R.styleable#ViewGroup_MarginLayout_layout_marginStart 5649 * @attr ref android.R.styleable#ViewGroup_MarginLayout_layout_marginTop 5650 * @attr ref android.R.styleable#ViewGroup_MarginLayout_layout_marginEnd 5651 * @attr ref android.R.styleable#ViewGroup_MarginLayout_layout_marginBottom 5652 * 5653 * @hide 5654 */ 5655 public void setMarginsRelative(int start, int top, int end, int bottom) { 5656 startMargin = start; 5657 topMargin = top; 5658 endMargin = end; 5659 bottomMargin = bottom; 5660 } 5661 5662 /** 5663 * Returns the start margin in pixels. 5664 * 5665 * @attr ref android.R.styleable#ViewGroup_MarginLayout_layout_marginStart 5666 * 5667 * @return the start margin in pixels. 5668 */ 5669 public int getMarginStart() { 5670 return startMargin; 5671 } 5672 5673 /** 5674 * Returns the end margin in pixels. 5675 * 5676 * @attr ref android.R.styleable#ViewGroup_MarginLayout_layout_marginEnd 5677 * 5678 * @return the end margin in pixels. 5679 */ 5680 public int getMarginEnd() { 5681 return endMargin; 5682 } 5683 5684 /** 5685 * Check if margins are relative. 5686 * 5687 * @attr ref android.R.styleable#ViewGroup_MarginLayout_layout_marginStart 5688 * @attr ref android.R.styleable#ViewGroup_MarginLayout_layout_marginEnd 5689 * 5690 * @return true if either marginStart or marginEnd has been set 5691 */ 5692 public boolean isMarginRelative() { 5693 return (startMargin != DEFAULT_RELATIVE) || (endMargin != DEFAULT_RELATIVE); 5694 } 5695 5696 /** 5697 * This will be called by {@link android.view.View#requestLayout()}. Left and Right margins 5698 * may be overridden depending on layout direction. 5699 */ 5700 @Override 5701 public void onResolveLayoutDirection(int layoutDirection) { 5702 switch(layoutDirection) { 5703 case View.LAYOUT_DIRECTION_RTL: 5704 leftMargin = (endMargin > DEFAULT_RELATIVE) ? endMargin : leftMargin; 5705 rightMargin = (startMargin > DEFAULT_RELATIVE) ? startMargin : rightMargin; 5706 break; 5707 case View.LAYOUT_DIRECTION_LTR: 5708 default: 5709 leftMargin = (startMargin > DEFAULT_RELATIVE) ? startMargin : leftMargin; 5710 rightMargin = (endMargin > DEFAULT_RELATIVE) ? endMargin : rightMargin; 5711 break; 5712 } 5713 } 5714 5715 /** 5716 * @hide 5717 */ 5718 @Override 5719 public void onDebugDraw(View view, Canvas canvas) { 5720 Paint paint = new Paint(); 5721 paint.setStyle(Paint.Style.STROKE); 5722 paint.setColor(Color.MAGENTA); 5723 5724 drawRect(canvas, 5725 view.getLeft() - leftMargin, 5726 view.getTop() - topMargin, 5727 view.getRight() + rightMargin, 5728 view.getBottom() + bottomMargin, paint); 5729 } 5730 } 5731 5732 /* Describes a touched view and the ids of the pointers that it has captured. 5733 * 5734 * This code assumes that pointer ids are always in the range 0..31 such that 5735 * it can use a bitfield to track which pointer ids are present. 5736 * As it happens, the lower layers of the input dispatch pipeline also use the 5737 * same trick so the assumption should be safe here... 5738 */ 5739 private static final class TouchTarget { 5740 private static final int MAX_RECYCLED = 32; 5741 private static final Object sRecycleLock = new Object(); 5742 private static TouchTarget sRecycleBin; 5743 private static int sRecycledCount; 5744 5745 public static final int ALL_POINTER_IDS = -1; // all ones 5746 5747 // The touched child view. 5748 public View child; 5749 5750 // The combined bit mask of pointer ids for all pointers captured by the target. 5751 public int pointerIdBits; 5752 5753 // The next target in the target list. 5754 public TouchTarget next; 5755 5756 private TouchTarget() { 5757 } 5758 5759 public static TouchTarget obtain(View child, int pointerIdBits) { 5760 final TouchTarget target; 5761 synchronized (sRecycleLock) { 5762 if (sRecycleBin == null) { 5763 target = new TouchTarget(); 5764 } else { 5765 target = sRecycleBin; 5766 sRecycleBin = target.next; 5767 sRecycledCount--; 5768 target.next = null; 5769 } 5770 } 5771 target.child = child; 5772 target.pointerIdBits = pointerIdBits; 5773 return target; 5774 } 5775 5776 public void recycle() { 5777 synchronized (sRecycleLock) { 5778 if (sRecycledCount < MAX_RECYCLED) { 5779 next = sRecycleBin; 5780 sRecycleBin = this; 5781 sRecycledCount += 1; 5782 } else { 5783 next = null; 5784 } 5785 child = null; 5786 } 5787 } 5788 } 5789 5790 /* Describes a hovered view. */ 5791 private static final class HoverTarget { 5792 private static final int MAX_RECYCLED = 32; 5793 private static final Object sRecycleLock = new Object(); 5794 private static HoverTarget sRecycleBin; 5795 private static int sRecycledCount; 5796 5797 // The hovered child view. 5798 public View child; 5799 5800 // The next target in the target list. 5801 public HoverTarget next; 5802 5803 private HoverTarget() { 5804 } 5805 5806 public static HoverTarget obtain(View child) { 5807 final HoverTarget target; 5808 synchronized (sRecycleLock) { 5809 if (sRecycleBin == null) { 5810 target = new HoverTarget(); 5811 } else { 5812 target = sRecycleBin; 5813 sRecycleBin = target.next; 5814 sRecycledCount--; 5815 target.next = null; 5816 } 5817 } 5818 target.child = child; 5819 return target; 5820 } 5821 5822 public void recycle() { 5823 synchronized (sRecycleLock) { 5824 if (sRecycledCount < MAX_RECYCLED) { 5825 next = sRecycleBin; 5826 sRecycleBin = this; 5827 sRecycledCount += 1; 5828 } else { 5829 next = null; 5830 } 5831 child = null; 5832 } 5833 } 5834 } 5835 5836 /** 5837 * Pooled class that orderes the children of a ViewGroup from start 5838 * to end based on how they are laid out and the layout direction. 5839 */ 5840 static class ChildListForAccessibility { 5841 5842 private static final int MAX_POOL_SIZE = 32; 5843 5844 private static final Object sPoolLock = new Object(); 5845 5846 private static ChildListForAccessibility sPool; 5847 5848 private static int sPoolSize; 5849 5850 private boolean mIsPooled; 5851 5852 private ChildListForAccessibility mNext; 5853 5854 private final ArrayList<View> mChildren = new ArrayList<View>(); 5855 5856 private final ArrayList<ViewLocationHolder> mHolders = new ArrayList<ViewLocationHolder>(); 5857 5858 public static ChildListForAccessibility obtain(ViewGroup parent, boolean sort) { 5859 ChildListForAccessibility list = null; 5860 synchronized (sPoolLock) { 5861 if (sPool != null) { 5862 list = sPool; 5863 sPool = list.mNext; 5864 list.mNext = null; 5865 list.mIsPooled = false; 5866 sPoolSize--; 5867 } else { 5868 list = new ChildListForAccessibility(); 5869 } 5870 list.init(parent, sort); 5871 return list; 5872 } 5873 } 5874 5875 public void recycle() { 5876 if (mIsPooled) { 5877 throw new IllegalStateException("Instance already recycled."); 5878 } 5879 clear(); 5880 synchronized (sPoolLock) { 5881 if (sPoolSize < MAX_POOL_SIZE) { 5882 mNext = sPool; 5883 mIsPooled = true; 5884 sPool = this; 5885 sPoolSize++; 5886 } 5887 } 5888 } 5889 5890 public int getChildCount() { 5891 return mChildren.size(); 5892 } 5893 5894 public View getChildAt(int index) { 5895 return mChildren.get(index); 5896 } 5897 5898 public int getChildIndex(View child) { 5899 return mChildren.indexOf(child); 5900 } 5901 5902 private void init(ViewGroup parent, boolean sort) { 5903 ArrayList<View> children = mChildren; 5904 final int childCount = parent.getChildCount(); 5905 for (int i = 0; i < childCount; i++) { 5906 View child = parent.getChildAt(i); 5907 children.add(child); 5908 } 5909 if (sort) { 5910 ArrayList<ViewLocationHolder> holders = mHolders; 5911 for (int i = 0; i < childCount; i++) { 5912 View child = children.get(i); 5913 ViewLocationHolder holder = ViewLocationHolder.obtain(parent, child); 5914 holders.add(holder); 5915 } 5916 Collections.sort(holders); 5917 for (int i = 0; i < childCount; i++) { 5918 ViewLocationHolder holder = holders.get(i); 5919 children.set(i, holder.mView); 5920 holder.recycle(); 5921 } 5922 holders.clear(); 5923 } 5924 } 5925 5926 private void clear() { 5927 mChildren.clear(); 5928 } 5929 } 5930 5931 /** 5932 * Pooled class that holds a View and its location with respect to 5933 * a specified root. This enables sorting of views based on their 5934 * coordinates without recomputing the position relative to the root 5935 * on every comparison. 5936 */ 5937 static class ViewLocationHolder implements Comparable<ViewLocationHolder> { 5938 5939 private static final int MAX_POOL_SIZE = 32; 5940 5941 private static final Object sPoolLock = new Object(); 5942 5943 private static ViewLocationHolder sPool; 5944 5945 private static int sPoolSize; 5946 5947 private boolean mIsPooled; 5948 5949 private ViewLocationHolder mNext; 5950 5951 private final Rect mLocation = new Rect(); 5952 5953 public View mView; 5954 5955 private int mLayoutDirection; 5956 5957 public static ViewLocationHolder obtain(ViewGroup root, View view) { 5958 ViewLocationHolder holder = null; 5959 synchronized (sPoolLock) { 5960 if (sPool != null) { 5961 holder = sPool; 5962 sPool = holder.mNext; 5963 holder.mNext = null; 5964 holder.mIsPooled = false; 5965 sPoolSize--; 5966 } else { 5967 holder = new ViewLocationHolder(); 5968 } 5969 holder.init(root, view); 5970 return holder; 5971 } 5972 } 5973 5974 public void recycle() { 5975 if (mIsPooled) { 5976 throw new IllegalStateException("Instance already recycled."); 5977 } 5978 clear(); 5979 synchronized (sPoolLock) { 5980 if (sPoolSize < MAX_POOL_SIZE) { 5981 mNext = sPool; 5982 mIsPooled = true; 5983 sPool = this; 5984 sPoolSize++; 5985 } 5986 } 5987 } 5988 5989 @Override 5990 public int compareTo(ViewLocationHolder another) { 5991 // This instance is greater than an invalid argument. 5992 if (another == null) { 5993 return 1; 5994 } 5995 if (getClass() != another.getClass()) { 5996 return 1; 5997 } 5998 // First is above second. 5999 if (mLocation.bottom - another.mLocation.top <= 0) { 6000 return -1; 6001 } 6002 // First is below second. 6003 if (mLocation.top - another.mLocation.bottom >= 0) { 6004 return 1; 6005 } 6006 // LTR 6007 if (mLayoutDirection == LAYOUT_DIRECTION_LTR) { 6008 final int leftDifference = mLocation.left - another.mLocation.left; 6009 // First more to the left than second. 6010 if (leftDifference != 0) { 6011 return leftDifference; 6012 } 6013 } else { // RTL 6014 final int rightDifference = mLocation.right - another.mLocation.right; 6015 // First more to the right than second. 6016 if (rightDifference != 0) { 6017 return -rightDifference; 6018 } 6019 } 6020 // Break tie by top. 6021 final int topDiference = mLocation.top - another.mLocation.top; 6022 if (topDiference != 0) { 6023 return topDiference; 6024 } 6025 // Break tie by height. 6026 final int heightDiference = mLocation.height() - another.mLocation.height(); 6027 if (heightDiference != 0) { 6028 return -heightDiference; 6029 } 6030 // Break tie by width. 6031 final int widthDiference = mLocation.width() - another.mLocation.width(); 6032 if (widthDiference != 0) { 6033 return -widthDiference; 6034 } 6035 // Just break the tie somehow. The accessibliity ids are unique 6036 // and stable, hence this is deterministic tie breaking. 6037 return mView.getAccessibilityViewId() - another.mView.getAccessibilityViewId(); 6038 } 6039 6040 private void init(ViewGroup root, View view) { 6041 Rect viewLocation = mLocation; 6042 view.getDrawingRect(viewLocation); 6043 root.offsetDescendantRectToMyCoords(view, viewLocation); 6044 mView = view; 6045 mLayoutDirection = root.getResolvedLayoutDirection(); 6046 } 6047 6048 private void clear() { 6049 mView = null; 6050 mLocation.set(0, 0, 0, 0); 6051 } 6052 } 6053} 6054