ViewGroup.java revision 604f440dfd6e5ee857f1e71d12c635d4ee1afcbc
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 private static Paint DEBUG_PAINT; 386 387 private static Paint getDebugPaint() { 388 if (DEBUG_PAINT == null) { 389 DEBUG_PAINT = new Paint(); 390 DEBUG_PAINT.setStyle(Paint.Style.STROKE); 391 } 392 return DEBUG_PAINT; 393 } 394 395 // Used to draw cached views 396 Paint mCachePaint; 397 398 // Used to animate add/remove changes in layout 399 private LayoutTransition mTransition; 400 401 // The set of views that are currently being transitioned. This list is used to track views 402 // being removed that should not actually be removed from the parent yet because they are 403 // being animated. 404 private ArrayList<View> mTransitioningViews; 405 406 // List of children changing visibility. This is used to potentially keep rendering 407 // views during a transition when they otherwise would have become gone/invisible 408 private ArrayList<View> mVisibilityChangingChildren; 409 410 // Indicates whether this container will use its children layers to draw 411 @ViewDebug.ExportedProperty(category = "drawing") 412 boolean mDrawLayers = true; 413 414 // Indicates how many of this container's child subtrees contain transient state 415 @ViewDebug.ExportedProperty(category = "layout") 416 private int mChildCountWithTransientState = 0; 417 418 public ViewGroup(Context context) { 419 super(context); 420 initViewGroup(); 421 } 422 423 public ViewGroup(Context context, AttributeSet attrs) { 424 super(context, attrs); 425 initViewGroup(); 426 initFromAttributes(context, attrs); 427 } 428 429 public ViewGroup(Context context, AttributeSet attrs, int defStyle) { 430 super(context, attrs, defStyle); 431 initViewGroup(); 432 initFromAttributes(context, attrs); 433 } 434 435 private boolean debugDraw() { 436 return mAttachInfo != null && mAttachInfo.mDebugLayout; 437 } 438 439 private void initViewGroup() { 440 // ViewGroup doesn't draw by default 441 if (!debugDraw()) { 442 setFlags(WILL_NOT_DRAW, DRAW_MASK); 443 } 444 mGroupFlags |= FLAG_CLIP_CHILDREN; 445 mGroupFlags |= FLAG_CLIP_TO_PADDING; 446 mGroupFlags |= FLAG_ANIMATION_DONE; 447 mGroupFlags |= FLAG_ANIMATION_CACHE; 448 mGroupFlags |= FLAG_ALWAYS_DRAWN_WITH_CACHE; 449 450 if (mContext.getApplicationInfo().targetSdkVersion >= Build.VERSION_CODES.HONEYCOMB) { 451 mGroupFlags |= FLAG_SPLIT_MOTION_EVENTS; 452 } 453 454 setDescendantFocusability(FOCUS_BEFORE_DESCENDANTS); 455 456 mChildren = new View[ARRAY_INITIAL_CAPACITY]; 457 mChildrenCount = 0; 458 459 mPersistentDrawingCache = PERSISTENT_SCROLLING_CACHE; 460 } 461 462 private void initFromAttributes(Context context, AttributeSet attrs) { 463 TypedArray a = context.obtainStyledAttributes(attrs, 464 R.styleable.ViewGroup); 465 466 final int N = a.getIndexCount(); 467 for (int i = 0; i < N; i++) { 468 int attr = a.getIndex(i); 469 switch (attr) { 470 case R.styleable.ViewGroup_clipChildren: 471 setClipChildren(a.getBoolean(attr, true)); 472 break; 473 case R.styleable.ViewGroup_clipToPadding: 474 setClipToPadding(a.getBoolean(attr, true)); 475 break; 476 case R.styleable.ViewGroup_animationCache: 477 setAnimationCacheEnabled(a.getBoolean(attr, true)); 478 break; 479 case R.styleable.ViewGroup_persistentDrawingCache: 480 setPersistentDrawingCache(a.getInt(attr, PERSISTENT_SCROLLING_CACHE)); 481 break; 482 case R.styleable.ViewGroup_addStatesFromChildren: 483 setAddStatesFromChildren(a.getBoolean(attr, false)); 484 break; 485 case R.styleable.ViewGroup_alwaysDrawnWithCache: 486 setAlwaysDrawnWithCacheEnabled(a.getBoolean(attr, true)); 487 break; 488 case R.styleable.ViewGroup_layoutAnimation: 489 int id = a.getResourceId(attr, -1); 490 if (id > 0) { 491 setLayoutAnimation(AnimationUtils.loadLayoutAnimation(mContext, id)); 492 } 493 break; 494 case R.styleable.ViewGroup_descendantFocusability: 495 setDescendantFocusability(DESCENDANT_FOCUSABILITY_FLAGS[a.getInt(attr, 0)]); 496 break; 497 case R.styleable.ViewGroup_splitMotionEvents: 498 setMotionEventSplittingEnabled(a.getBoolean(attr, false)); 499 break; 500 case R.styleable.ViewGroup_animateLayoutChanges: 501 boolean animateLayoutChanges = a.getBoolean(attr, false); 502 if (animateLayoutChanges) { 503 setLayoutTransition(new LayoutTransition()); 504 } 505 break; 506 } 507 } 508 509 a.recycle(); 510 } 511 512 /** 513 * Gets the descendant focusability of this view group. The descendant 514 * focusability defines the relationship between this view group and its 515 * descendants when looking for a view to take focus in 516 * {@link #requestFocus(int, android.graphics.Rect)}. 517 * 518 * @return one of {@link #FOCUS_BEFORE_DESCENDANTS}, {@link #FOCUS_AFTER_DESCENDANTS}, 519 * {@link #FOCUS_BLOCK_DESCENDANTS}. 520 */ 521 @ViewDebug.ExportedProperty(category = "focus", mapping = { 522 @ViewDebug.IntToString(from = FOCUS_BEFORE_DESCENDANTS, to = "FOCUS_BEFORE_DESCENDANTS"), 523 @ViewDebug.IntToString(from = FOCUS_AFTER_DESCENDANTS, to = "FOCUS_AFTER_DESCENDANTS"), 524 @ViewDebug.IntToString(from = FOCUS_BLOCK_DESCENDANTS, to = "FOCUS_BLOCK_DESCENDANTS") 525 }) 526 public int getDescendantFocusability() { 527 return mGroupFlags & FLAG_MASK_FOCUSABILITY; 528 } 529 530 /** 531 * Set the descendant focusability of this view group. This defines the relationship 532 * between this view group and its descendants when looking for a view to 533 * take focus in {@link #requestFocus(int, android.graphics.Rect)}. 534 * 535 * @param focusability one of {@link #FOCUS_BEFORE_DESCENDANTS}, {@link #FOCUS_AFTER_DESCENDANTS}, 536 * {@link #FOCUS_BLOCK_DESCENDANTS}. 537 */ 538 public void setDescendantFocusability(int focusability) { 539 switch (focusability) { 540 case FOCUS_BEFORE_DESCENDANTS: 541 case FOCUS_AFTER_DESCENDANTS: 542 case FOCUS_BLOCK_DESCENDANTS: 543 break; 544 default: 545 throw new IllegalArgumentException("must be one of FOCUS_BEFORE_DESCENDANTS, " 546 + "FOCUS_AFTER_DESCENDANTS, FOCUS_BLOCK_DESCENDANTS"); 547 } 548 mGroupFlags &= ~FLAG_MASK_FOCUSABILITY; 549 mGroupFlags |= (focusability & FLAG_MASK_FOCUSABILITY); 550 } 551 552 /** 553 * {@inheritDoc} 554 */ 555 @Override 556 void handleFocusGainInternal(int direction, Rect previouslyFocusedRect) { 557 if (mFocused != null) { 558 mFocused.unFocus(); 559 mFocused = null; 560 } 561 super.handleFocusGainInternal(direction, previouslyFocusedRect); 562 } 563 564 /** 565 * {@inheritDoc} 566 */ 567 public void requestChildFocus(View child, View focused) { 568 if (DBG) { 569 System.out.println(this + " requestChildFocus()"); 570 } 571 if (getDescendantFocusability() == FOCUS_BLOCK_DESCENDANTS) { 572 return; 573 } 574 575 // Unfocus us, if necessary 576 super.unFocus(); 577 578 // We had a previous notion of who had focus. Clear it. 579 if (mFocused != child) { 580 if (mFocused != null) { 581 mFocused.unFocus(); 582 } 583 584 mFocused = child; 585 } 586 if (mParent != null) { 587 mParent.requestChildFocus(this, focused); 588 } 589 } 590 591 /** 592 * {@inheritDoc} 593 */ 594 public void focusableViewAvailable(View v) { 595 if (mParent != null 596 // shortcut: don't report a new focusable view if we block our descendants from 597 // getting focus 598 && (getDescendantFocusability() != FOCUS_BLOCK_DESCENDANTS) 599 // shortcut: don't report a new focusable view if we already are focused 600 // (and we don't prefer our descendants) 601 // 602 // note: knowing that mFocused is non-null is not a good enough reason 603 // to break the traversal since in that case we'd actually have to find 604 // the focused view and make sure it wasn't FOCUS_AFTER_DESCENDANTS and 605 // an ancestor of v; this will get checked for at ViewAncestor 606 && !(isFocused() && getDescendantFocusability() != FOCUS_AFTER_DESCENDANTS)) { 607 mParent.focusableViewAvailable(v); 608 } 609 } 610 611 /** 612 * {@inheritDoc} 613 */ 614 public boolean showContextMenuForChild(View originalView) { 615 return mParent != null && mParent.showContextMenuForChild(originalView); 616 } 617 618 /** 619 * {@inheritDoc} 620 */ 621 public ActionMode startActionModeForChild(View originalView, ActionMode.Callback callback) { 622 return mParent != null ? mParent.startActionModeForChild(originalView, callback) : null; 623 } 624 625 /** 626 * Find the nearest view in the specified direction that wants to take 627 * focus. 628 * 629 * @param focused The view that currently has focus 630 * @param direction One of FOCUS_UP, FOCUS_DOWN, FOCUS_LEFT, and 631 * FOCUS_RIGHT, or 0 for not applicable. 632 */ 633 public View focusSearch(View focused, int direction) { 634 if (isRootNamespace()) { 635 // root namespace means we should consider ourselves the top of the 636 // tree for focus searching; otherwise we could be focus searching 637 // into other tabs. see LocalActivityManager and TabHost for more info 638 return FocusFinder.getInstance().findNextFocus(this, focused, direction); 639 } else if (mParent != null) { 640 return mParent.focusSearch(focused, direction); 641 } 642 return null; 643 } 644 645 /** 646 * {@inheritDoc} 647 */ 648 public boolean requestChildRectangleOnScreen(View child, Rect rectangle, boolean immediate) { 649 return false; 650 } 651 652 /** 653 * {@inheritDoc} 654 */ 655 @Override 656 public boolean requestSendAccessibilityEvent(View child, AccessibilityEvent event) { 657 ViewParent parent = mParent; 658 if (parent == null) { 659 return false; 660 } 661 final boolean propagate = onRequestSendAccessibilityEvent(child, event); 662 if (!propagate) { 663 return false; 664 } 665 return parent.requestSendAccessibilityEvent(this, event); 666 } 667 668 /** 669 * Called when a child has requested sending an {@link AccessibilityEvent} and 670 * gives an opportunity to its parent to augment the event. 671 * <p> 672 * If an {@link android.view.View.AccessibilityDelegate} has been specified via calling 673 * {@link android.view.View#setAccessibilityDelegate(android.view.View.AccessibilityDelegate)} its 674 * {@link android.view.View.AccessibilityDelegate#onRequestSendAccessibilityEvent(ViewGroup, View, AccessibilityEvent)} 675 * is responsible for handling this call. 676 * </p> 677 * 678 * @param child The child which requests sending the event. 679 * @param event The event to be sent. 680 * @return True if the event should be sent. 681 * 682 * @see #requestSendAccessibilityEvent(View, AccessibilityEvent) 683 */ 684 public boolean onRequestSendAccessibilityEvent(View child, AccessibilityEvent event) { 685 if (mAccessibilityDelegate != null) { 686 return mAccessibilityDelegate.onRequestSendAccessibilityEvent(this, child, event); 687 } else { 688 return onRequestSendAccessibilityEventInternal(child, event); 689 } 690 } 691 692 /** 693 * @see #onRequestSendAccessibilityEvent(View, AccessibilityEvent) 694 * 695 * Note: Called from the default {@link View.AccessibilityDelegate}. 696 */ 697 boolean onRequestSendAccessibilityEventInternal(View child, AccessibilityEvent event) { 698 return true; 699 } 700 701 /** 702 * Called when a child view has changed whether or not it is tracking transient state. 703 * 704 * @hide 705 */ 706 public void childHasTransientStateChanged(View child, boolean childHasTransientState) { 707 final boolean oldHasTransientState = hasTransientState(); 708 if (childHasTransientState) { 709 mChildCountWithTransientState++; 710 } else { 711 mChildCountWithTransientState--; 712 } 713 714 final boolean newHasTransientState = hasTransientState(); 715 if (mParent != null && oldHasTransientState != newHasTransientState) { 716 try { 717 mParent.childHasTransientStateChanged(this, newHasTransientState); 718 } catch (AbstractMethodError e) { 719 Log.e(TAG, mParent.getClass().getSimpleName() + 720 " does not fully implement ViewParent", e); 721 } 722 } 723 } 724 725 /** 726 * @hide 727 */ 728 @Override 729 public boolean hasTransientState() { 730 return mChildCountWithTransientState > 0 || super.hasTransientState(); 731 } 732 733 /** 734 * {@inheritDoc} 735 */ 736 @Override 737 public boolean dispatchUnhandledMove(View focused, int direction) { 738 return mFocused != null && 739 mFocused.dispatchUnhandledMove(focused, direction); 740 } 741 742 /** 743 * {@inheritDoc} 744 */ 745 public void clearChildFocus(View child) { 746 if (DBG) { 747 System.out.println(this + " clearChildFocus()"); 748 } 749 750 mFocused = null; 751 if (mParent != null) { 752 mParent.clearChildFocus(this); 753 } 754 } 755 756 /** 757 * {@inheritDoc} 758 */ 759 @Override 760 public void clearFocus() { 761 if (DBG) { 762 System.out.println(this + " clearFocus()"); 763 } 764 if (mFocused == null) { 765 super.clearFocus(); 766 } else { 767 mFocused.clearFocus(); 768 mFocused = null; 769 } 770 } 771 772 /** 773 * {@inheritDoc} 774 */ 775 @Override 776 void unFocus() { 777 if (DBG) { 778 System.out.println(this + " unFocus()"); 779 } 780 if (mFocused == null) { 781 super.unFocus(); 782 } else { 783 mFocused.unFocus(); 784 mFocused = null; 785 } 786 } 787 788 /** 789 * Returns the focused child of this view, if any. The child may have focus 790 * or contain focus. 791 * 792 * @return the focused child or null. 793 */ 794 public View getFocusedChild() { 795 return mFocused; 796 } 797 798 /** 799 * Returns true if this view has or contains focus 800 * 801 * @return true if this view has or contains focus 802 */ 803 @Override 804 public boolean hasFocus() { 805 return (mPrivateFlags & FOCUSED) != 0 || mFocused != null; 806 } 807 808 /* 809 * (non-Javadoc) 810 * 811 * @see android.view.View#findFocus() 812 */ 813 @Override 814 public View findFocus() { 815 if (DBG) { 816 System.out.println("Find focus in " + this + ": flags=" 817 + isFocused() + ", child=" + mFocused); 818 } 819 820 if (isFocused()) { 821 return this; 822 } 823 824 if (mFocused != null) { 825 return mFocused.findFocus(); 826 } 827 return null; 828 } 829 830 /** 831 * {@inheritDoc} 832 */ 833 @Override 834 public boolean hasFocusable() { 835 if ((mViewFlags & VISIBILITY_MASK) != VISIBLE) { 836 return false; 837 } 838 839 if (isFocusable()) { 840 return true; 841 } 842 843 final int descendantFocusability = getDescendantFocusability(); 844 if (descendantFocusability != FOCUS_BLOCK_DESCENDANTS) { 845 final int count = mChildrenCount; 846 final View[] children = mChildren; 847 848 for (int i = 0; i < count; i++) { 849 final View child = children[i]; 850 if (child.hasFocusable()) { 851 return true; 852 } 853 } 854 } 855 856 return false; 857 } 858 859 /** 860 * {@inheritDoc} 861 */ 862 @Override 863 public void addFocusables(ArrayList<View> views, int direction) { 864 addFocusables(views, direction, FOCUSABLES_TOUCH_MODE); 865 } 866 867 /** 868 * {@inheritDoc} 869 */ 870 @Override 871 public void addFocusables(ArrayList<View> views, int direction, int focusableMode) { 872 final int focusableCount = views.size(); 873 874 final int descendantFocusability = getDescendantFocusability(); 875 876 if (descendantFocusability != FOCUS_BLOCK_DESCENDANTS) { 877 final int count = mChildrenCount; 878 final View[] children = mChildren; 879 880 for (int i = 0; i < count; i++) { 881 final View child = children[i]; 882 if ((child.mViewFlags & VISIBILITY_MASK) == VISIBLE) { 883 child.addFocusables(views, direction, focusableMode); 884 } 885 } 886 } 887 888 // we add ourselves (if focusable) in all cases except for when we are 889 // FOCUS_AFTER_DESCENDANTS and there are some descendants focusable. this is 890 // to avoid the focus search finding layouts when a more precise search 891 // among the focusable children would be more interesting. 892 if ( 893 descendantFocusability != FOCUS_AFTER_DESCENDANTS || 894 // No focusable descendants 895 (focusableCount == views.size())) { 896 super.addFocusables(views, direction, focusableMode); 897 } 898 } 899 900 @Override 901 public void findViewsWithText(ArrayList<View> outViews, CharSequence text, int flags) { 902 super.findViewsWithText(outViews, text, flags); 903 final int childrenCount = mChildrenCount; 904 final View[] children = mChildren; 905 for (int i = 0; i < childrenCount; i++) { 906 View child = children[i]; 907 if ((child.mViewFlags & VISIBILITY_MASK) == VISIBLE 908 && (child.mPrivateFlags & IS_ROOT_NAMESPACE) == 0) { 909 child.findViewsWithText(outViews, text, flags); 910 } 911 } 912 } 913 914 @Override 915 View findViewByAccessibilityIdTraversal(int accessibilityId) { 916 View foundView = super.findViewByAccessibilityIdTraversal(accessibilityId); 917 if (foundView != null) { 918 return foundView; 919 } 920 final int childrenCount = mChildrenCount; 921 final View[] children = mChildren; 922 for (int i = 0; i < childrenCount; i++) { 923 View child = children[i]; 924 foundView = child.findViewByAccessibilityIdTraversal(accessibilityId); 925 if (foundView != null) { 926 return foundView; 927 } 928 } 929 return null; 930 } 931 932 /** 933 * {@inheritDoc} 934 */ 935 @Override 936 public void dispatchWindowFocusChanged(boolean hasFocus) { 937 super.dispatchWindowFocusChanged(hasFocus); 938 final int count = mChildrenCount; 939 final View[] children = mChildren; 940 for (int i = 0; i < count; i++) { 941 children[i].dispatchWindowFocusChanged(hasFocus); 942 } 943 } 944 945 /** 946 * {@inheritDoc} 947 */ 948 @Override 949 public void addTouchables(ArrayList<View> views) { 950 super.addTouchables(views); 951 952 final int count = mChildrenCount; 953 final View[] children = mChildren; 954 955 for (int i = 0; i < count; i++) { 956 final View child = children[i]; 957 if ((child.mViewFlags & VISIBILITY_MASK) == VISIBLE) { 958 child.addTouchables(views); 959 } 960 } 961 } 962 963 /** 964 * @hide 965 */ 966 @Override 967 public void makeOptionalFitsSystemWindows() { 968 super.makeOptionalFitsSystemWindows(); 969 final int count = mChildrenCount; 970 final View[] children = mChildren; 971 for (int i = 0; i < count; i++) { 972 children[i].makeOptionalFitsSystemWindows(); 973 } 974 } 975 976 /** 977 * {@inheritDoc} 978 */ 979 @Override 980 public void dispatchDisplayHint(int hint) { 981 super.dispatchDisplayHint(hint); 982 final int count = mChildrenCount; 983 final View[] children = mChildren; 984 for (int i = 0; i < count; i++) { 985 children[i].dispatchDisplayHint(hint); 986 } 987 } 988 989 /** 990 * Called when a view's visibility has changed. Notify the parent to take any appropriate 991 * action. 992 * 993 * @param child The view whose visibility has changed 994 * @param oldVisibility The previous visibility value (GONE, INVISIBLE, or VISIBLE). 995 * @param newVisibility The new visibility value (GONE, INVISIBLE, or VISIBLE). 996 * @hide 997 */ 998 protected void onChildVisibilityChanged(View child, int oldVisibility, int newVisibility) { 999 if (mTransition != null) { 1000 if (newVisibility == VISIBLE) { 1001 mTransition.showChild(this, child, oldVisibility); 1002 } else { 1003 mTransition.hideChild(this, child, newVisibility); 1004 // Only track this on disappearing views - appearing views are already visible 1005 // and don't need special handling during drawChild() 1006 if (mVisibilityChangingChildren == null) { 1007 mVisibilityChangingChildren = new ArrayList<View>(); 1008 } 1009 mVisibilityChangingChildren.add(child); 1010 if (mTransitioningViews != null && mTransitioningViews.contains(child)) { 1011 addDisappearingView(child); 1012 } 1013 } 1014 } 1015 1016 // in all cases, for drags 1017 if (mCurrentDrag != null) { 1018 if (newVisibility == VISIBLE) { 1019 notifyChildOfDrag(child); 1020 } 1021 } 1022 } 1023 1024 /** 1025 * {@inheritDoc} 1026 */ 1027 @Override 1028 protected void dispatchVisibilityChanged(View changedView, int visibility) { 1029 super.dispatchVisibilityChanged(changedView, visibility); 1030 final int count = mChildrenCount; 1031 final View[] children = mChildren; 1032 for (int i = 0; i < count; i++) { 1033 children[i].dispatchVisibilityChanged(changedView, visibility); 1034 } 1035 } 1036 1037 /** 1038 * {@inheritDoc} 1039 */ 1040 @Override 1041 public void dispatchWindowVisibilityChanged(int visibility) { 1042 super.dispatchWindowVisibilityChanged(visibility); 1043 final int count = mChildrenCount; 1044 final View[] children = mChildren; 1045 for (int i = 0; i < count; i++) { 1046 children[i].dispatchWindowVisibilityChanged(visibility); 1047 } 1048 } 1049 1050 /** 1051 * {@inheritDoc} 1052 */ 1053 @Override 1054 public void dispatchConfigurationChanged(Configuration newConfig) { 1055 super.dispatchConfigurationChanged(newConfig); 1056 final int count = mChildrenCount; 1057 final View[] children = mChildren; 1058 for (int i = 0; i < count; i++) { 1059 children[i].dispatchConfigurationChanged(newConfig); 1060 } 1061 } 1062 1063 /** 1064 * {@inheritDoc} 1065 */ 1066 public void recomputeViewAttributes(View child) { 1067 if (mAttachInfo != null && !mAttachInfo.mRecomputeGlobalAttributes) { 1068 ViewParent parent = mParent; 1069 if (parent != null) parent.recomputeViewAttributes(this); 1070 } 1071 } 1072 1073 @Override 1074 void dispatchCollectViewAttributes(AttachInfo attachInfo, int visibility) { 1075 if ((visibility & VISIBILITY_MASK) == VISIBLE) { 1076 super.dispatchCollectViewAttributes(attachInfo, visibility); 1077 final int count = mChildrenCount; 1078 final View[] children = mChildren; 1079 for (int i = 0; i < count; i++) { 1080 final View child = children[i]; 1081 child.dispatchCollectViewAttributes(attachInfo, 1082 visibility | (child.mViewFlags&VISIBILITY_MASK)); 1083 } 1084 } 1085 } 1086 1087 /** 1088 * {@inheritDoc} 1089 */ 1090 public void bringChildToFront(View child) { 1091 int index = indexOfChild(child); 1092 if (index >= 0) { 1093 removeFromArray(index); 1094 addInArray(child, mChildrenCount); 1095 child.mParent = this; 1096 } 1097 } 1098 1099 /** 1100 * {@inheritDoc} 1101 */ 1102 // TODO: Write real docs 1103 @Override 1104 public boolean dispatchDragEvent(DragEvent event) { 1105 boolean retval = false; 1106 final float tx = event.mX; 1107 final float ty = event.mY; 1108 1109 ViewRootImpl root = getViewRootImpl(); 1110 1111 // Dispatch down the view hierarchy 1112 switch (event.mAction) { 1113 case DragEvent.ACTION_DRAG_STARTED: { 1114 // clear state to recalculate which views we drag over 1115 mCurrentDragView = null; 1116 1117 // Set up our tracking of drag-started notifications 1118 mCurrentDrag = DragEvent.obtain(event); 1119 if (mDragNotifiedChildren == null) { 1120 mDragNotifiedChildren = new HashSet<View>(); 1121 } else { 1122 mDragNotifiedChildren.clear(); 1123 } 1124 1125 // Now dispatch down to our children, caching the responses 1126 mChildAcceptsDrag = false; 1127 final int count = mChildrenCount; 1128 final View[] children = mChildren; 1129 for (int i = 0; i < count; i++) { 1130 final View child = children[i]; 1131 child.mPrivateFlags2 &= ~View.DRAG_MASK; 1132 if (child.getVisibility() == VISIBLE) { 1133 final boolean handled = notifyChildOfDrag(children[i]); 1134 if (handled) { 1135 mChildAcceptsDrag = true; 1136 } 1137 } 1138 } 1139 1140 // Return HANDLED if one of our children can accept the drag 1141 if (mChildAcceptsDrag) { 1142 retval = true; 1143 } 1144 } break; 1145 1146 case DragEvent.ACTION_DRAG_ENDED: { 1147 // Release the bookkeeping now that the drag lifecycle has ended 1148 if (mDragNotifiedChildren != null) { 1149 for (View child : mDragNotifiedChildren) { 1150 // If a child was notified about an ongoing drag, it's told that it's over 1151 child.dispatchDragEvent(event); 1152 child.mPrivateFlags2 &= ~View.DRAG_MASK; 1153 child.refreshDrawableState(); 1154 } 1155 1156 mDragNotifiedChildren.clear(); 1157 mCurrentDrag.recycle(); 1158 mCurrentDrag = null; 1159 } 1160 1161 // We consider drag-ended to have been handled if one of our children 1162 // had offered to handle the drag. 1163 if (mChildAcceptsDrag) { 1164 retval = true; 1165 } 1166 } break; 1167 1168 case DragEvent.ACTION_DRAG_LOCATION: { 1169 // Find the [possibly new] drag target 1170 final View target = findFrontmostDroppableChildAt(event.mX, event.mY, mLocalPoint); 1171 1172 // If we've changed apparent drag target, tell the view root which view 1173 // we're over now [for purposes of the eventual drag-recipient-changed 1174 // notifications to the framework] and tell the new target that the drag 1175 // has entered its bounds. The root will see setDragFocus() calls all 1176 // the way down to the final leaf view that is handling the LOCATION event 1177 // before reporting the new potential recipient to the framework. 1178 if (mCurrentDragView != target) { 1179 root.setDragFocus(target); 1180 1181 final int action = event.mAction; 1182 // If we've dragged off of a child view, send it the EXITED message 1183 if (mCurrentDragView != null) { 1184 final View view = mCurrentDragView; 1185 event.mAction = DragEvent.ACTION_DRAG_EXITED; 1186 view.dispatchDragEvent(event); 1187 view.mPrivateFlags2 &= ~View.DRAG_HOVERED; 1188 view.refreshDrawableState(); 1189 } 1190 mCurrentDragView = target; 1191 1192 // If we've dragged over a new child view, send it the ENTERED message 1193 if (target != null) { 1194 event.mAction = DragEvent.ACTION_DRAG_ENTERED; 1195 target.dispatchDragEvent(event); 1196 target.mPrivateFlags2 |= View.DRAG_HOVERED; 1197 target.refreshDrawableState(); 1198 } 1199 event.mAction = action; // restore the event's original state 1200 } 1201 1202 // Dispatch the actual drag location notice, localized into its coordinates 1203 if (target != null) { 1204 event.mX = mLocalPoint.x; 1205 event.mY = mLocalPoint.y; 1206 1207 retval = target.dispatchDragEvent(event); 1208 1209 event.mX = tx; 1210 event.mY = ty; 1211 } 1212 } break; 1213 1214 /* Entered / exited dispatch 1215 * 1216 * DRAG_ENTERED is not dispatched downwards from ViewGroup. The reason for this is 1217 * that we're about to get the corresponding LOCATION event, which we will use to 1218 * determine which of our children is the new target; at that point we will 1219 * push a DRAG_ENTERED down to the new target child [which may itself be a ViewGroup]. 1220 * 1221 * DRAG_EXITED *is* dispatched all the way down immediately: once we know the 1222 * drag has left this ViewGroup, we know by definition that every contained subview 1223 * is also no longer under the drag point. 1224 */ 1225 1226 case DragEvent.ACTION_DRAG_EXITED: { 1227 if (mCurrentDragView != null) { 1228 final View view = mCurrentDragView; 1229 view.dispatchDragEvent(event); 1230 view.mPrivateFlags2 &= ~View.DRAG_HOVERED; 1231 view.refreshDrawableState(); 1232 1233 mCurrentDragView = null; 1234 } 1235 } break; 1236 1237 case DragEvent.ACTION_DROP: { 1238 if (ViewDebug.DEBUG_DRAG) Log.d(View.VIEW_LOG_TAG, "Drop event: " + event); 1239 View target = findFrontmostDroppableChildAt(event.mX, event.mY, mLocalPoint); 1240 if (target != null) { 1241 if (ViewDebug.DEBUG_DRAG) Log.d(View.VIEW_LOG_TAG, " dispatch drop to " + target); 1242 event.mX = mLocalPoint.x; 1243 event.mY = mLocalPoint.y; 1244 retval = target.dispatchDragEvent(event); 1245 event.mX = tx; 1246 event.mY = ty; 1247 } else { 1248 if (ViewDebug.DEBUG_DRAG) { 1249 Log.d(View.VIEW_LOG_TAG, " not dropped on an accepting view"); 1250 } 1251 } 1252 } break; 1253 } 1254 1255 // If none of our children could handle the event, try here 1256 if (!retval) { 1257 // Call up to the View implementation that dispatches to installed listeners 1258 retval = super.dispatchDragEvent(event); 1259 } 1260 return retval; 1261 } 1262 1263 // Find the frontmost child view that lies under the given point, and calculate 1264 // the position within its own local coordinate system. 1265 View findFrontmostDroppableChildAt(float x, float y, PointF outLocalPoint) { 1266 final int count = mChildrenCount; 1267 final View[] children = mChildren; 1268 for (int i = count - 1; i >= 0; i--) { 1269 final View child = children[i]; 1270 if (!child.canAcceptDrag()) { 1271 continue; 1272 } 1273 1274 if (isTransformedTouchPointInView(x, y, child, outLocalPoint)) { 1275 return child; 1276 } 1277 } 1278 return null; 1279 } 1280 1281 boolean notifyChildOfDrag(View child) { 1282 if (ViewDebug.DEBUG_DRAG) { 1283 Log.d(View.VIEW_LOG_TAG, "Sending drag-started to view: " + child); 1284 } 1285 1286 boolean canAccept = false; 1287 if (! mDragNotifiedChildren.contains(child)) { 1288 mDragNotifiedChildren.add(child); 1289 canAccept = child.dispatchDragEvent(mCurrentDrag); 1290 if (canAccept && !child.canAcceptDrag()) { 1291 child.mPrivateFlags2 |= View.DRAG_CAN_ACCEPT; 1292 child.refreshDrawableState(); 1293 } 1294 } 1295 return canAccept; 1296 } 1297 1298 @Override 1299 public void dispatchWindowSystemUiVisiblityChanged(int visible) { 1300 super.dispatchWindowSystemUiVisiblityChanged(visible); 1301 1302 final int count = mChildrenCount; 1303 final View[] children = mChildren; 1304 for (int i=0; i <count; i++) { 1305 final View child = children[i]; 1306 child.dispatchWindowSystemUiVisiblityChanged(visible); 1307 } 1308 } 1309 1310 @Override 1311 public void dispatchSystemUiVisibilityChanged(int visible) { 1312 super.dispatchSystemUiVisibilityChanged(visible); 1313 1314 final int count = mChildrenCount; 1315 final View[] children = mChildren; 1316 for (int i=0; i <count; i++) { 1317 final View child = children[i]; 1318 child.dispatchSystemUiVisibilityChanged(visible); 1319 } 1320 } 1321 1322 @Override 1323 void updateLocalSystemUiVisibility(int localValue, int localChanges) { 1324 super.updateLocalSystemUiVisibility(localValue, localChanges); 1325 1326 final int count = mChildrenCount; 1327 final View[] children = mChildren; 1328 for (int i=0; i <count; i++) { 1329 final View child = children[i]; 1330 child.updateLocalSystemUiVisibility(localValue, localChanges); 1331 } 1332 } 1333 1334 /** 1335 * {@inheritDoc} 1336 */ 1337 @Override 1338 public boolean dispatchKeyEventPreIme(KeyEvent event) { 1339 if ((mPrivateFlags & (FOCUSED | HAS_BOUNDS)) == (FOCUSED | HAS_BOUNDS)) { 1340 return super.dispatchKeyEventPreIme(event); 1341 } else if (mFocused != null && (mFocused.mPrivateFlags & HAS_BOUNDS) == HAS_BOUNDS) { 1342 return mFocused.dispatchKeyEventPreIme(event); 1343 } 1344 return false; 1345 } 1346 1347 /** 1348 * {@inheritDoc} 1349 */ 1350 @Override 1351 public boolean dispatchKeyEvent(KeyEvent event) { 1352 if (mInputEventConsistencyVerifier != null) { 1353 mInputEventConsistencyVerifier.onKeyEvent(event, 1); 1354 } 1355 1356 if ((mPrivateFlags & (FOCUSED | HAS_BOUNDS)) == (FOCUSED | HAS_BOUNDS)) { 1357 if (super.dispatchKeyEvent(event)) { 1358 return true; 1359 } 1360 } else if (mFocused != null && (mFocused.mPrivateFlags & HAS_BOUNDS) == HAS_BOUNDS) { 1361 if (mFocused.dispatchKeyEvent(event)) { 1362 return true; 1363 } 1364 } 1365 1366 if (mInputEventConsistencyVerifier != null) { 1367 mInputEventConsistencyVerifier.onUnhandledEvent(event, 1); 1368 } 1369 return false; 1370 } 1371 1372 /** 1373 * {@inheritDoc} 1374 */ 1375 @Override 1376 public boolean dispatchKeyShortcutEvent(KeyEvent event) { 1377 if ((mPrivateFlags & (FOCUSED | HAS_BOUNDS)) == (FOCUSED | HAS_BOUNDS)) { 1378 return super.dispatchKeyShortcutEvent(event); 1379 } else if (mFocused != null && (mFocused.mPrivateFlags & HAS_BOUNDS) == HAS_BOUNDS) { 1380 return mFocused.dispatchKeyShortcutEvent(event); 1381 } 1382 return false; 1383 } 1384 1385 /** 1386 * {@inheritDoc} 1387 */ 1388 @Override 1389 public boolean dispatchTrackballEvent(MotionEvent event) { 1390 if (mInputEventConsistencyVerifier != null) { 1391 mInputEventConsistencyVerifier.onTrackballEvent(event, 1); 1392 } 1393 1394 if ((mPrivateFlags & (FOCUSED | HAS_BOUNDS)) == (FOCUSED | HAS_BOUNDS)) { 1395 if (super.dispatchTrackballEvent(event)) { 1396 return true; 1397 } 1398 } else if (mFocused != null && (mFocused.mPrivateFlags & HAS_BOUNDS) == HAS_BOUNDS) { 1399 if (mFocused.dispatchTrackballEvent(event)) { 1400 return true; 1401 } 1402 } 1403 1404 if (mInputEventConsistencyVerifier != null) { 1405 mInputEventConsistencyVerifier.onUnhandledEvent(event, 1); 1406 } 1407 return false; 1408 } 1409 1410 /** 1411 * {@inheritDoc} 1412 */ 1413 @SuppressWarnings({"ConstantConditions"}) 1414 @Override 1415 protected boolean dispatchHoverEvent(MotionEvent event) { 1416 final int action = event.getAction(); 1417 1418 // First check whether the view group wants to intercept the hover event. 1419 final boolean interceptHover = onInterceptHoverEvent(event); 1420 event.setAction(action); // restore action in case it was changed 1421 1422 MotionEvent eventNoHistory = event; 1423 boolean handled = false; 1424 1425 // Send events to the hovered children and build a new list of hover targets until 1426 // one is found that handles the event. 1427 HoverTarget firstOldHoverTarget = mFirstHoverTarget; 1428 mFirstHoverTarget = null; 1429 if (!interceptHover && action != MotionEvent.ACTION_HOVER_EXIT) { 1430 final float x = event.getX(); 1431 final float y = event.getY(); 1432 final int childrenCount = mChildrenCount; 1433 if (childrenCount != 0) { 1434 final View[] children = mChildren; 1435 HoverTarget lastHoverTarget = null; 1436 for (int i = childrenCount - 1; i >= 0; i--) { 1437 final View child = children[i]; 1438 if (!canViewReceivePointerEvents(child) 1439 || !isTransformedTouchPointInView(x, y, child, null)) { 1440 continue; 1441 } 1442 1443 // Obtain a hover target for this child. Dequeue it from the 1444 // old hover target list if the child was previously hovered. 1445 HoverTarget hoverTarget = firstOldHoverTarget; 1446 final boolean wasHovered; 1447 for (HoverTarget predecessor = null; ;) { 1448 if (hoverTarget == null) { 1449 hoverTarget = HoverTarget.obtain(child); 1450 wasHovered = false; 1451 break; 1452 } 1453 1454 if (hoverTarget.child == child) { 1455 if (predecessor != null) { 1456 predecessor.next = hoverTarget.next; 1457 } else { 1458 firstOldHoverTarget = hoverTarget.next; 1459 } 1460 hoverTarget.next = null; 1461 wasHovered = true; 1462 break; 1463 } 1464 1465 predecessor = hoverTarget; 1466 hoverTarget = hoverTarget.next; 1467 } 1468 1469 // Enqueue the hover target onto the new hover target list. 1470 if (lastHoverTarget != null) { 1471 lastHoverTarget.next = hoverTarget; 1472 } else { 1473 lastHoverTarget = hoverTarget; 1474 mFirstHoverTarget = hoverTarget; 1475 } 1476 1477 // Dispatch the event to the child. 1478 if (action == MotionEvent.ACTION_HOVER_ENTER) { 1479 if (!wasHovered) { 1480 // Send the enter as is. 1481 handled |= dispatchTransformedGenericPointerEvent( 1482 event, child); // enter 1483 } 1484 } else if (action == MotionEvent.ACTION_HOVER_MOVE) { 1485 if (!wasHovered) { 1486 // Synthesize an enter from a move. 1487 eventNoHistory = obtainMotionEventNoHistoryOrSelf(eventNoHistory); 1488 eventNoHistory.setAction(MotionEvent.ACTION_HOVER_ENTER); 1489 handled |= dispatchTransformedGenericPointerEvent( 1490 eventNoHistory, child); // enter 1491 eventNoHistory.setAction(action); 1492 1493 handled |= dispatchTransformedGenericPointerEvent( 1494 eventNoHistory, child); // move 1495 } else { 1496 // Send the move as is. 1497 handled |= dispatchTransformedGenericPointerEvent(event, child); 1498 } 1499 } 1500 if (handled) { 1501 break; 1502 } 1503 } 1504 } 1505 } 1506 1507 // Send exit events to all previously hovered children that are no longer hovered. 1508 while (firstOldHoverTarget != null) { 1509 final View child = firstOldHoverTarget.child; 1510 1511 // Exit the old hovered child. 1512 if (action == MotionEvent.ACTION_HOVER_EXIT) { 1513 // Send the exit as is. 1514 handled |= dispatchTransformedGenericPointerEvent( 1515 event, child); // exit 1516 } else { 1517 // Synthesize an exit from a move or enter. 1518 // Ignore the result because hover focus has moved to a different view. 1519 if (action == MotionEvent.ACTION_HOVER_MOVE) { 1520 dispatchTransformedGenericPointerEvent( 1521 event, child); // move 1522 } 1523 eventNoHistory = obtainMotionEventNoHistoryOrSelf(eventNoHistory); 1524 eventNoHistory.setAction(MotionEvent.ACTION_HOVER_EXIT); 1525 dispatchTransformedGenericPointerEvent( 1526 eventNoHistory, child); // exit 1527 eventNoHistory.setAction(action); 1528 } 1529 1530 final HoverTarget nextOldHoverTarget = firstOldHoverTarget.next; 1531 firstOldHoverTarget.recycle(); 1532 firstOldHoverTarget = nextOldHoverTarget; 1533 } 1534 1535 // Send events to the view group itself if no children have handled it. 1536 boolean newHoveredSelf = !handled; 1537 if (newHoveredSelf == mHoveredSelf) { 1538 if (newHoveredSelf) { 1539 // Send event to the view group as before. 1540 handled |= super.dispatchHoverEvent(event); 1541 } 1542 } else { 1543 if (mHoveredSelf) { 1544 // Exit the view group. 1545 if (action == MotionEvent.ACTION_HOVER_EXIT) { 1546 // Send the exit as is. 1547 handled |= super.dispatchHoverEvent(event); // exit 1548 } else { 1549 // Synthesize an exit from a move or enter. 1550 // Ignore the result because hover focus is moving to a different view. 1551 if (action == MotionEvent.ACTION_HOVER_MOVE) { 1552 super.dispatchHoverEvent(event); // move 1553 } 1554 eventNoHistory = obtainMotionEventNoHistoryOrSelf(eventNoHistory); 1555 eventNoHistory.setAction(MotionEvent.ACTION_HOVER_EXIT); 1556 super.dispatchHoverEvent(eventNoHistory); // exit 1557 eventNoHistory.setAction(action); 1558 } 1559 mHoveredSelf = false; 1560 } 1561 1562 if (newHoveredSelf) { 1563 // Enter the view group. 1564 if (action == MotionEvent.ACTION_HOVER_ENTER) { 1565 // Send the enter as is. 1566 handled |= super.dispatchHoverEvent(event); // enter 1567 mHoveredSelf = true; 1568 } else if (action == MotionEvent.ACTION_HOVER_MOVE) { 1569 // Synthesize an enter from a move. 1570 eventNoHistory = obtainMotionEventNoHistoryOrSelf(eventNoHistory); 1571 eventNoHistory.setAction(MotionEvent.ACTION_HOVER_ENTER); 1572 handled |= super.dispatchHoverEvent(eventNoHistory); // enter 1573 eventNoHistory.setAction(action); 1574 1575 handled |= super.dispatchHoverEvent(eventNoHistory); // move 1576 mHoveredSelf = true; 1577 } 1578 } 1579 } 1580 1581 // Recycle the copy of the event that we made. 1582 if (eventNoHistory != event) { 1583 eventNoHistory.recycle(); 1584 } 1585 1586 // Done. 1587 return handled; 1588 } 1589 1590 private void exitHoverTargets() { 1591 if (mHoveredSelf || mFirstHoverTarget != null) { 1592 final long now = SystemClock.uptimeMillis(); 1593 MotionEvent event = MotionEvent.obtain(now, now, 1594 MotionEvent.ACTION_HOVER_EXIT, 0.0f, 0.0f, 0); 1595 event.setSource(InputDevice.SOURCE_TOUCHSCREEN); 1596 dispatchHoverEvent(event); 1597 event.recycle(); 1598 } 1599 } 1600 1601 private void cancelHoverTarget(View view) { 1602 HoverTarget predecessor = null; 1603 HoverTarget target = mFirstHoverTarget; 1604 while (target != null) { 1605 final HoverTarget next = target.next; 1606 if (target.child == view) { 1607 if (predecessor == null) { 1608 mFirstHoverTarget = next; 1609 } else { 1610 predecessor.next = next; 1611 } 1612 target.recycle(); 1613 1614 final long now = SystemClock.uptimeMillis(); 1615 MotionEvent event = MotionEvent.obtain(now, now, 1616 MotionEvent.ACTION_HOVER_EXIT, 0.0f, 0.0f, 0); 1617 event.setSource(InputDevice.SOURCE_TOUCHSCREEN); 1618 view.dispatchHoverEvent(event); 1619 event.recycle(); 1620 return; 1621 } 1622 predecessor = target; 1623 target = next; 1624 } 1625 } 1626 1627 /** @hide */ 1628 @Override 1629 protected boolean hasHoveredChild() { 1630 return mFirstHoverTarget != null; 1631 } 1632 1633 @Override 1634 public void addChildrenForAccessibility(ArrayList<View> childrenForAccessibility) { 1635 View[] children = mChildren; 1636 final int childrenCount = mChildrenCount; 1637 for (int i = 0; i < childrenCount; i++) { 1638 View child = children[i]; 1639 if ((child.mViewFlags & VISIBILITY_MASK) == VISIBLE 1640 && (child.mPrivateFlags & IS_ROOT_NAMESPACE) == 0) { 1641 if (child.includeForAccessibility()) { 1642 childrenForAccessibility.add(child); 1643 } else { 1644 child.addChildrenForAccessibility(childrenForAccessibility); 1645 } 1646 } 1647 } 1648 } 1649 1650 /** 1651 * @hide 1652 */ 1653 @Override 1654 public void childAccessibilityStateChanged(View child) { 1655 if (mParent != null) { 1656 mParent.childAccessibilityStateChanged(child); 1657 } 1658 } 1659 1660 /** 1661 * Implement this method to intercept hover events before they are handled 1662 * by child views. 1663 * <p> 1664 * This method is called before dispatching a hover event to a child of 1665 * the view group or to the view group's own {@link #onHoverEvent} to allow 1666 * the view group a chance to intercept the hover event. 1667 * This method can also be used to watch all pointer motions that occur within 1668 * the bounds of the view group even when the pointer is hovering over 1669 * a child of the view group rather than over the view group itself. 1670 * </p><p> 1671 * The view group can prevent its children from receiving hover events by 1672 * implementing this method and returning <code>true</code> to indicate 1673 * that it would like to intercept hover events. The view group must 1674 * continuously return <code>true</code> from {@link #onInterceptHoverEvent} 1675 * for as long as it wishes to continue intercepting hover events from 1676 * its children. 1677 * </p><p> 1678 * Interception preserves the invariant that at most one view can be 1679 * hovered at a time by transferring hover focus from the currently hovered 1680 * child to the view group or vice-versa as needed. 1681 * </p><p> 1682 * If this method returns <code>true</code> and a child is already hovered, then the 1683 * child view will first receive a hover exit event and then the view group 1684 * itself will receive a hover enter event in {@link #onHoverEvent}. 1685 * Likewise, if this method had previously returned <code>true</code> to intercept hover 1686 * events and instead returns <code>false</code> while the pointer is hovering 1687 * within the bounds of one of a child, then the view group will first receive a 1688 * hover exit event in {@link #onHoverEvent} and then the hovered child will 1689 * receive a hover enter event. 1690 * </p><p> 1691 * The default implementation always returns false. 1692 * </p> 1693 * 1694 * @param event The motion event that describes the hover. 1695 * @return True if the view group would like to intercept the hover event 1696 * and prevent its children from receiving it. 1697 */ 1698 public boolean onInterceptHoverEvent(MotionEvent event) { 1699 return false; 1700 } 1701 1702 private static MotionEvent obtainMotionEventNoHistoryOrSelf(MotionEvent event) { 1703 if (event.getHistorySize() == 0) { 1704 return event; 1705 } 1706 return MotionEvent.obtainNoHistory(event); 1707 } 1708 1709 /** 1710 * {@inheritDoc} 1711 */ 1712 @Override 1713 protected boolean dispatchGenericPointerEvent(MotionEvent event) { 1714 // Send the event to the child under the pointer. 1715 final int childrenCount = mChildrenCount; 1716 if (childrenCount != 0) { 1717 final View[] children = mChildren; 1718 final float x = event.getX(); 1719 final float y = event.getY(); 1720 1721 for (int i = childrenCount - 1; i >= 0; i--) { 1722 final View child = children[i]; 1723 if (!canViewReceivePointerEvents(child) 1724 || !isTransformedTouchPointInView(x, y, child, null)) { 1725 continue; 1726 } 1727 1728 if (dispatchTransformedGenericPointerEvent(event, child)) { 1729 return true; 1730 } 1731 } 1732 } 1733 1734 // No child handled the event. Send it to this view group. 1735 return super.dispatchGenericPointerEvent(event); 1736 } 1737 1738 /** 1739 * {@inheritDoc} 1740 */ 1741 @Override 1742 protected boolean dispatchGenericFocusedEvent(MotionEvent event) { 1743 // Send the event to the focused child or to this view group if it has focus. 1744 if ((mPrivateFlags & (FOCUSED | HAS_BOUNDS)) == (FOCUSED | HAS_BOUNDS)) { 1745 return super.dispatchGenericFocusedEvent(event); 1746 } else if (mFocused != null && (mFocused.mPrivateFlags & HAS_BOUNDS) == HAS_BOUNDS) { 1747 return mFocused.dispatchGenericMotionEvent(event); 1748 } 1749 return false; 1750 } 1751 1752 /** 1753 * Dispatches a generic pointer event to a child, taking into account 1754 * transformations that apply to the child. 1755 * 1756 * @param event The event to send. 1757 * @param child The view to send the event to. 1758 * @return {@code true} if the child handled the event. 1759 */ 1760 private boolean dispatchTransformedGenericPointerEvent(MotionEvent event, View child) { 1761 final float offsetX = mScrollX - child.mLeft; 1762 final float offsetY = mScrollY - child.mTop; 1763 1764 boolean handled; 1765 if (!child.hasIdentityMatrix()) { 1766 MotionEvent transformedEvent = MotionEvent.obtain(event); 1767 transformedEvent.offsetLocation(offsetX, offsetY); 1768 transformedEvent.transform(child.getInverseMatrix()); 1769 handled = child.dispatchGenericMotionEvent(transformedEvent); 1770 transformedEvent.recycle(); 1771 } else { 1772 event.offsetLocation(offsetX, offsetY); 1773 handled = child.dispatchGenericMotionEvent(event); 1774 event.offsetLocation(-offsetX, -offsetY); 1775 } 1776 return handled; 1777 } 1778 1779 /** 1780 * {@inheritDoc} 1781 */ 1782 @Override 1783 public boolean dispatchTouchEvent(MotionEvent ev) { 1784 if (mInputEventConsistencyVerifier != null) { 1785 mInputEventConsistencyVerifier.onTouchEvent(ev, 1); 1786 } 1787 1788 boolean handled = false; 1789 if (onFilterTouchEventForSecurity(ev)) { 1790 final int action = ev.getAction(); 1791 final int actionMasked = action & MotionEvent.ACTION_MASK; 1792 1793 // Handle an initial down. 1794 if (actionMasked == MotionEvent.ACTION_DOWN) { 1795 // Throw away all previous state when starting a new touch gesture. 1796 // The framework may have dropped the up or cancel event for the previous gesture 1797 // due to an app switch, ANR, or some other state change. 1798 cancelAndClearTouchTargets(ev); 1799 resetTouchState(); 1800 } 1801 1802 // Check for interception. 1803 final boolean intercepted; 1804 if (actionMasked == MotionEvent.ACTION_DOWN 1805 || mFirstTouchTarget != null) { 1806 final boolean disallowIntercept = (mGroupFlags & FLAG_DISALLOW_INTERCEPT) != 0; 1807 if (!disallowIntercept) { 1808 intercepted = onInterceptTouchEvent(ev); 1809 ev.setAction(action); // restore action in case it was changed 1810 } else { 1811 intercepted = false; 1812 } 1813 } else { 1814 // There are no touch targets and this action is not an initial down 1815 // so this view group continues to intercept touches. 1816 intercepted = true; 1817 } 1818 1819 // Check for cancelation. 1820 final boolean canceled = resetCancelNextUpFlag(this) 1821 || actionMasked == MotionEvent.ACTION_CANCEL; 1822 1823 // Update list of touch targets for pointer down, if needed. 1824 final boolean split = (mGroupFlags & FLAG_SPLIT_MOTION_EVENTS) != 0; 1825 TouchTarget newTouchTarget = null; 1826 boolean alreadyDispatchedToNewTouchTarget = false; 1827 if (!canceled && !intercepted) { 1828 if (actionMasked == MotionEvent.ACTION_DOWN 1829 || (split && actionMasked == MotionEvent.ACTION_POINTER_DOWN) 1830 || actionMasked == MotionEvent.ACTION_HOVER_MOVE) { 1831 final int actionIndex = ev.getActionIndex(); // always 0 for down 1832 final int idBitsToAssign = split ? 1 << ev.getPointerId(actionIndex) 1833 : TouchTarget.ALL_POINTER_IDS; 1834 1835 // Clean up earlier touch targets for this pointer id in case they 1836 // have become out of sync. 1837 removePointersFromTouchTargets(idBitsToAssign); 1838 1839 final int childrenCount = mChildrenCount; 1840 if (childrenCount != 0) { 1841 // Find a child that can receive the event. 1842 // Scan children from front to back. 1843 final View[] children = mChildren; 1844 final float x = ev.getX(actionIndex); 1845 final float y = ev.getY(actionIndex); 1846 1847 for (int i = childrenCount - 1; i >= 0; i--) { 1848 final View child = children[i]; 1849 if (!canViewReceivePointerEvents(child) 1850 || !isTransformedTouchPointInView(x, y, child, null)) { 1851 continue; 1852 } 1853 1854 newTouchTarget = getTouchTarget(child); 1855 if (newTouchTarget != null) { 1856 // Child is already receiving touch within its bounds. 1857 // Give it the new pointer in addition to the ones it is handling. 1858 newTouchTarget.pointerIdBits |= idBitsToAssign; 1859 break; 1860 } 1861 1862 resetCancelNextUpFlag(child); 1863 if (dispatchTransformedTouchEvent(ev, false, child, idBitsToAssign)) { 1864 // Child wants to receive touch within its bounds. 1865 mLastTouchDownTime = ev.getDownTime(); 1866 mLastTouchDownIndex = i; 1867 mLastTouchDownX = ev.getX(); 1868 mLastTouchDownY = ev.getY(); 1869 newTouchTarget = addTouchTarget(child, idBitsToAssign); 1870 alreadyDispatchedToNewTouchTarget = true; 1871 break; 1872 } 1873 } 1874 } 1875 1876 if (newTouchTarget == null && mFirstTouchTarget != null) { 1877 // Did not find a child to receive the event. 1878 // Assign the pointer to the least recently added target. 1879 newTouchTarget = mFirstTouchTarget; 1880 while (newTouchTarget.next != null) { 1881 newTouchTarget = newTouchTarget.next; 1882 } 1883 newTouchTarget.pointerIdBits |= idBitsToAssign; 1884 } 1885 } 1886 } 1887 1888 // Dispatch to touch targets. 1889 if (mFirstTouchTarget == null) { 1890 // No touch targets so treat this as an ordinary view. 1891 handled = dispatchTransformedTouchEvent(ev, canceled, null, 1892 TouchTarget.ALL_POINTER_IDS); 1893 } else { 1894 // Dispatch to touch targets, excluding the new touch target if we already 1895 // dispatched to it. Cancel touch targets if necessary. 1896 TouchTarget predecessor = null; 1897 TouchTarget target = mFirstTouchTarget; 1898 while (target != null) { 1899 final TouchTarget next = target.next; 1900 if (alreadyDispatchedToNewTouchTarget && target == newTouchTarget) { 1901 handled = true; 1902 } else { 1903 final boolean cancelChild = resetCancelNextUpFlag(target.child) 1904 || intercepted; 1905 if (dispatchTransformedTouchEvent(ev, cancelChild, 1906 target.child, target.pointerIdBits)) { 1907 handled = true; 1908 } 1909 if (cancelChild) { 1910 if (predecessor == null) { 1911 mFirstTouchTarget = next; 1912 } else { 1913 predecessor.next = next; 1914 } 1915 target.recycle(); 1916 target = next; 1917 continue; 1918 } 1919 } 1920 predecessor = target; 1921 target = next; 1922 } 1923 } 1924 1925 // Update list of touch targets for pointer up or cancel, if needed. 1926 if (canceled 1927 || actionMasked == MotionEvent.ACTION_UP 1928 || actionMasked == MotionEvent.ACTION_HOVER_MOVE) { 1929 resetTouchState(); 1930 } else if (split && actionMasked == MotionEvent.ACTION_POINTER_UP) { 1931 final int actionIndex = ev.getActionIndex(); 1932 final int idBitsToRemove = 1 << ev.getPointerId(actionIndex); 1933 removePointersFromTouchTargets(idBitsToRemove); 1934 } 1935 } 1936 1937 if (!handled && mInputEventConsistencyVerifier != null) { 1938 mInputEventConsistencyVerifier.onUnhandledEvent(ev, 1); 1939 } 1940 return handled; 1941 } 1942 1943 /** 1944 * Resets all touch state in preparation for a new cycle. 1945 */ 1946 private void resetTouchState() { 1947 clearTouchTargets(); 1948 resetCancelNextUpFlag(this); 1949 mGroupFlags &= ~FLAG_DISALLOW_INTERCEPT; 1950 } 1951 1952 /** 1953 * Resets the cancel next up flag. 1954 * Returns true if the flag was previously set. 1955 */ 1956 private static boolean resetCancelNextUpFlag(View view) { 1957 if ((view.mPrivateFlags & CANCEL_NEXT_UP_EVENT) != 0) { 1958 view.mPrivateFlags &= ~CANCEL_NEXT_UP_EVENT; 1959 return true; 1960 } 1961 return false; 1962 } 1963 1964 /** 1965 * Clears all touch targets. 1966 */ 1967 private void clearTouchTargets() { 1968 TouchTarget target = mFirstTouchTarget; 1969 if (target != null) { 1970 do { 1971 TouchTarget next = target.next; 1972 target.recycle(); 1973 target = next; 1974 } while (target != null); 1975 mFirstTouchTarget = null; 1976 } 1977 } 1978 1979 /** 1980 * Cancels and clears all touch targets. 1981 */ 1982 private void cancelAndClearTouchTargets(MotionEvent event) { 1983 if (mFirstTouchTarget != null) { 1984 boolean syntheticEvent = false; 1985 if (event == null) { 1986 final long now = SystemClock.uptimeMillis(); 1987 event = MotionEvent.obtain(now, now, 1988 MotionEvent.ACTION_CANCEL, 0.0f, 0.0f, 0); 1989 event.setSource(InputDevice.SOURCE_TOUCHSCREEN); 1990 syntheticEvent = true; 1991 } 1992 1993 for (TouchTarget target = mFirstTouchTarget; target != null; target = target.next) { 1994 resetCancelNextUpFlag(target.child); 1995 dispatchTransformedTouchEvent(event, true, target.child, target.pointerIdBits); 1996 } 1997 clearTouchTargets(); 1998 1999 if (syntheticEvent) { 2000 event.recycle(); 2001 } 2002 } 2003 } 2004 2005 /** 2006 * Gets the touch target for specified child view. 2007 * Returns null if not found. 2008 */ 2009 private TouchTarget getTouchTarget(View child) { 2010 for (TouchTarget target = mFirstTouchTarget; target != null; target = target.next) { 2011 if (target.child == child) { 2012 return target; 2013 } 2014 } 2015 return null; 2016 } 2017 2018 /** 2019 * Adds a touch target for specified child to the beginning of the list. 2020 * Assumes the target child is not already present. 2021 */ 2022 private TouchTarget addTouchTarget(View child, int pointerIdBits) { 2023 TouchTarget target = TouchTarget.obtain(child, pointerIdBits); 2024 target.next = mFirstTouchTarget; 2025 mFirstTouchTarget = target; 2026 return target; 2027 } 2028 2029 /** 2030 * Removes the pointer ids from consideration. 2031 */ 2032 private void removePointersFromTouchTargets(int pointerIdBits) { 2033 TouchTarget predecessor = null; 2034 TouchTarget target = mFirstTouchTarget; 2035 while (target != null) { 2036 final TouchTarget next = target.next; 2037 if ((target.pointerIdBits & pointerIdBits) != 0) { 2038 target.pointerIdBits &= ~pointerIdBits; 2039 if (target.pointerIdBits == 0) { 2040 if (predecessor == null) { 2041 mFirstTouchTarget = next; 2042 } else { 2043 predecessor.next = next; 2044 } 2045 target.recycle(); 2046 target = next; 2047 continue; 2048 } 2049 } 2050 predecessor = target; 2051 target = next; 2052 } 2053 } 2054 2055 private void cancelTouchTarget(View view) { 2056 TouchTarget predecessor = null; 2057 TouchTarget target = mFirstTouchTarget; 2058 while (target != null) { 2059 final TouchTarget next = target.next; 2060 if (target.child == view) { 2061 if (predecessor == null) { 2062 mFirstTouchTarget = next; 2063 } else { 2064 predecessor.next = next; 2065 } 2066 target.recycle(); 2067 2068 final long now = SystemClock.uptimeMillis(); 2069 MotionEvent event = MotionEvent.obtain(now, now, 2070 MotionEvent.ACTION_CANCEL, 0.0f, 0.0f, 0); 2071 event.setSource(InputDevice.SOURCE_TOUCHSCREEN); 2072 view.dispatchTouchEvent(event); 2073 event.recycle(); 2074 return; 2075 } 2076 predecessor = target; 2077 target = next; 2078 } 2079 } 2080 2081 /** 2082 * Returns true if a child view can receive pointer events. 2083 * @hide 2084 */ 2085 private static boolean canViewReceivePointerEvents(View child) { 2086 return (child.mViewFlags & VISIBILITY_MASK) == VISIBLE 2087 || child.getAnimation() != null; 2088 } 2089 2090 /** 2091 * Returns true if a child view contains the specified point when transformed 2092 * into its coordinate space. 2093 * Child must not be null. 2094 * @hide 2095 */ 2096 protected boolean isTransformedTouchPointInView(float x, float y, View child, 2097 PointF outLocalPoint) { 2098 float localX = x + mScrollX - child.mLeft; 2099 float localY = y + mScrollY - child.mTop; 2100 if (! child.hasIdentityMatrix() && mAttachInfo != null) { 2101 final float[] localXY = mAttachInfo.mTmpTransformLocation; 2102 localXY[0] = localX; 2103 localXY[1] = localY; 2104 child.getInverseMatrix().mapPoints(localXY); 2105 localX = localXY[0]; 2106 localY = localXY[1]; 2107 } 2108 final boolean isInView = child.pointInView(localX, localY); 2109 if (isInView && outLocalPoint != null) { 2110 outLocalPoint.set(localX, localY); 2111 } 2112 return isInView; 2113 } 2114 2115 /** 2116 * Transforms a motion event into the coordinate space of a particular child view, 2117 * filters out irrelevant pointer ids, and overrides its action if necessary. 2118 * If child is null, assumes the MotionEvent will be sent to this ViewGroup instead. 2119 */ 2120 private boolean dispatchTransformedTouchEvent(MotionEvent event, boolean cancel, 2121 View child, int desiredPointerIdBits) { 2122 final boolean handled; 2123 2124 // Canceling motions is a special case. We don't need to perform any transformations 2125 // or filtering. The important part is the action, not the contents. 2126 final int oldAction = event.getAction(); 2127 if (cancel || oldAction == MotionEvent.ACTION_CANCEL) { 2128 event.setAction(MotionEvent.ACTION_CANCEL); 2129 if (child == null) { 2130 handled = super.dispatchTouchEvent(event); 2131 } else { 2132 handled = child.dispatchTouchEvent(event); 2133 } 2134 event.setAction(oldAction); 2135 return handled; 2136 } 2137 2138 // Calculate the number of pointers to deliver. 2139 final int oldPointerIdBits = event.getPointerIdBits(); 2140 final int newPointerIdBits = oldPointerIdBits & desiredPointerIdBits; 2141 2142 // If for some reason we ended up in an inconsistent state where it looks like we 2143 // might produce a motion event with no pointers in it, then drop the event. 2144 if (newPointerIdBits == 0) { 2145 return false; 2146 } 2147 2148 // If the number of pointers is the same and we don't need to perform any fancy 2149 // irreversible transformations, then we can reuse the motion event for this 2150 // dispatch as long as we are careful to revert any changes we make. 2151 // Otherwise we need to make a copy. 2152 final MotionEvent transformedEvent; 2153 if (newPointerIdBits == oldPointerIdBits) { 2154 if (child == null || child.hasIdentityMatrix()) { 2155 if (child == null) { 2156 handled = super.dispatchTouchEvent(event); 2157 } else { 2158 final float offsetX = mScrollX - child.mLeft; 2159 final float offsetY = mScrollY - child.mTop; 2160 event.offsetLocation(offsetX, offsetY); 2161 2162 handled = child.dispatchTouchEvent(event); 2163 2164 event.offsetLocation(-offsetX, -offsetY); 2165 } 2166 return handled; 2167 } 2168 transformedEvent = MotionEvent.obtain(event); 2169 } else { 2170 transformedEvent = event.split(newPointerIdBits); 2171 } 2172 2173 // Perform any necessary transformations and dispatch. 2174 if (child == null) { 2175 handled = super.dispatchTouchEvent(transformedEvent); 2176 } else { 2177 final float offsetX = mScrollX - child.mLeft; 2178 final float offsetY = mScrollY - child.mTop; 2179 transformedEvent.offsetLocation(offsetX, offsetY); 2180 if (! child.hasIdentityMatrix()) { 2181 transformedEvent.transform(child.getInverseMatrix()); 2182 } 2183 2184 handled = child.dispatchTouchEvent(transformedEvent); 2185 } 2186 2187 // Done. 2188 transformedEvent.recycle(); 2189 return handled; 2190 } 2191 2192 /** 2193 * Enable or disable the splitting of MotionEvents to multiple children during touch event 2194 * dispatch. This behavior is enabled by default for applications that target an 2195 * SDK version of {@link Build.VERSION_CODES#HONEYCOMB} or newer. 2196 * 2197 * <p>When this option is enabled MotionEvents may be split and dispatched to different child 2198 * views depending on where each pointer initially went down. This allows for user interactions 2199 * such as scrolling two panes of content independently, chording of buttons, and performing 2200 * independent gestures on different pieces of content. 2201 * 2202 * @param split <code>true</code> to allow MotionEvents to be split and dispatched to multiple 2203 * child views. <code>false</code> to only allow one child view to be the target of 2204 * any MotionEvent received by this ViewGroup. 2205 */ 2206 public void setMotionEventSplittingEnabled(boolean split) { 2207 // TODO Applications really shouldn't change this setting mid-touch event, 2208 // but perhaps this should handle that case and send ACTION_CANCELs to any child views 2209 // with gestures in progress when this is changed. 2210 if (split) { 2211 mGroupFlags |= FLAG_SPLIT_MOTION_EVENTS; 2212 } else { 2213 mGroupFlags &= ~FLAG_SPLIT_MOTION_EVENTS; 2214 } 2215 } 2216 2217 /** 2218 * Returns true if MotionEvents dispatched to this ViewGroup can be split to multiple children. 2219 * @return true if MotionEvents dispatched to this ViewGroup can be split to multiple children. 2220 */ 2221 public boolean isMotionEventSplittingEnabled() { 2222 return (mGroupFlags & FLAG_SPLIT_MOTION_EVENTS) == FLAG_SPLIT_MOTION_EVENTS; 2223 } 2224 2225 /** 2226 * {@inheritDoc} 2227 */ 2228 public void requestDisallowInterceptTouchEvent(boolean disallowIntercept) { 2229 2230 if (disallowIntercept == ((mGroupFlags & FLAG_DISALLOW_INTERCEPT) != 0)) { 2231 // We're already in this state, assume our ancestors are too 2232 return; 2233 } 2234 2235 if (disallowIntercept) { 2236 mGroupFlags |= FLAG_DISALLOW_INTERCEPT; 2237 } else { 2238 mGroupFlags &= ~FLAG_DISALLOW_INTERCEPT; 2239 } 2240 2241 // Pass it up to our parent 2242 if (mParent != null) { 2243 mParent.requestDisallowInterceptTouchEvent(disallowIntercept); 2244 } 2245 } 2246 2247 /** 2248 * Implement this method to intercept all touch screen motion events. This 2249 * allows you to watch events as they are dispatched to your children, and 2250 * take ownership of the current gesture at any point. 2251 * 2252 * <p>Using this function takes some care, as it has a fairly complicated 2253 * interaction with {@link View#onTouchEvent(MotionEvent) 2254 * View.onTouchEvent(MotionEvent)}, and using it requires implementing 2255 * that method as well as this one in the correct way. Events will be 2256 * received in the following order: 2257 * 2258 * <ol> 2259 * <li> You will receive the down event here. 2260 * <li> The down event will be handled either by a child of this view 2261 * group, or given to your own onTouchEvent() method to handle; this means 2262 * you should implement onTouchEvent() to return true, so you will 2263 * continue to see the rest of the gesture (instead of looking for 2264 * a parent view to handle it). Also, by returning true from 2265 * onTouchEvent(), you will not receive any following 2266 * events in onInterceptTouchEvent() and all touch processing must 2267 * happen in onTouchEvent() like normal. 2268 * <li> For as long as you return false from this function, each following 2269 * event (up to and including the final up) will be delivered first here 2270 * and then to the target's onTouchEvent(). 2271 * <li> If you return true from here, you will not receive any 2272 * following events: the target view will receive the same event but 2273 * with the action {@link MotionEvent#ACTION_CANCEL}, and all further 2274 * events will be delivered to your onTouchEvent() method and no longer 2275 * appear here. 2276 * </ol> 2277 * 2278 * @param ev The motion event being dispatched down the hierarchy. 2279 * @return Return true to steal motion events from the children and have 2280 * them dispatched to this ViewGroup through onTouchEvent(). 2281 * The current target will receive an ACTION_CANCEL event, and no further 2282 * messages will be delivered here. 2283 */ 2284 public boolean onInterceptTouchEvent(MotionEvent ev) { 2285 return false; 2286 } 2287 2288 /** 2289 * {@inheritDoc} 2290 * 2291 * Looks for a view to give focus to respecting the setting specified by 2292 * {@link #getDescendantFocusability()}. 2293 * 2294 * Uses {@link #onRequestFocusInDescendants(int, android.graphics.Rect)} to 2295 * find focus within the children of this group when appropriate. 2296 * 2297 * @see #FOCUS_BEFORE_DESCENDANTS 2298 * @see #FOCUS_AFTER_DESCENDANTS 2299 * @see #FOCUS_BLOCK_DESCENDANTS 2300 * @see #onRequestFocusInDescendants(int, android.graphics.Rect) 2301 */ 2302 @Override 2303 public boolean requestFocus(int direction, Rect previouslyFocusedRect) { 2304 if (DBG) { 2305 System.out.println(this + " ViewGroup.requestFocus direction=" 2306 + direction); 2307 } 2308 int descendantFocusability = getDescendantFocusability(); 2309 2310 switch (descendantFocusability) { 2311 case FOCUS_BLOCK_DESCENDANTS: 2312 return super.requestFocus(direction, previouslyFocusedRect); 2313 case FOCUS_BEFORE_DESCENDANTS: { 2314 final boolean took = super.requestFocus(direction, previouslyFocusedRect); 2315 return took ? took : onRequestFocusInDescendants(direction, previouslyFocusedRect); 2316 } 2317 case FOCUS_AFTER_DESCENDANTS: { 2318 final boolean took = onRequestFocusInDescendants(direction, previouslyFocusedRect); 2319 return took ? took : super.requestFocus(direction, previouslyFocusedRect); 2320 } 2321 default: 2322 throw new IllegalStateException("descendant focusability must be " 2323 + "one of FOCUS_BEFORE_DESCENDANTS, FOCUS_AFTER_DESCENDANTS, FOCUS_BLOCK_DESCENDANTS " 2324 + "but is " + descendantFocusability); 2325 } 2326 } 2327 2328 /** 2329 * Look for a descendant to call {@link View#requestFocus} on. 2330 * Called by {@link ViewGroup#requestFocus(int, android.graphics.Rect)} 2331 * when it wants to request focus within its children. Override this to 2332 * customize how your {@link ViewGroup} requests focus within its children. 2333 * @param direction One of FOCUS_UP, FOCUS_DOWN, FOCUS_LEFT, and FOCUS_RIGHT 2334 * @param previouslyFocusedRect The rectangle (in this View's coordinate system) 2335 * to give a finer grained hint about where focus is coming from. May be null 2336 * if there is no hint. 2337 * @return Whether focus was taken. 2338 */ 2339 @SuppressWarnings({"ConstantConditions"}) 2340 protected boolean onRequestFocusInDescendants(int direction, 2341 Rect previouslyFocusedRect) { 2342 int index; 2343 int increment; 2344 int end; 2345 int count = mChildrenCount; 2346 if ((direction & FOCUS_FORWARD) != 0) { 2347 index = 0; 2348 increment = 1; 2349 end = count; 2350 } else { 2351 index = count - 1; 2352 increment = -1; 2353 end = -1; 2354 } 2355 final View[] children = mChildren; 2356 for (int i = index; i != end; i += increment) { 2357 View child = children[i]; 2358 if ((child.mViewFlags & VISIBILITY_MASK) == VISIBLE) { 2359 if (child.requestFocus(direction, previouslyFocusedRect)) { 2360 return true; 2361 } 2362 } 2363 } 2364 return false; 2365 } 2366 2367 /** 2368 * {@inheritDoc} 2369 * 2370 * @hide 2371 */ 2372 @Override 2373 public void dispatchStartTemporaryDetach() { 2374 super.dispatchStartTemporaryDetach(); 2375 final int count = mChildrenCount; 2376 final View[] children = mChildren; 2377 for (int i = 0; i < count; i++) { 2378 children[i].dispatchStartTemporaryDetach(); 2379 } 2380 } 2381 2382 /** 2383 * {@inheritDoc} 2384 * 2385 * @hide 2386 */ 2387 @Override 2388 public void dispatchFinishTemporaryDetach() { 2389 super.dispatchFinishTemporaryDetach(); 2390 final int count = mChildrenCount; 2391 final View[] children = mChildren; 2392 for (int i = 0; i < count; i++) { 2393 children[i].dispatchFinishTemporaryDetach(); 2394 } 2395 } 2396 2397 /** 2398 * {@inheritDoc} 2399 */ 2400 @Override 2401 void dispatchAttachedToWindow(AttachInfo info, int visibility) { 2402 mGroupFlags |= FLAG_PREVENT_DISPATCH_ATTACHED_TO_WINDOW; 2403 super.dispatchAttachedToWindow(info, visibility); 2404 mGroupFlags &= ~FLAG_PREVENT_DISPATCH_ATTACHED_TO_WINDOW; 2405 2406 final int count = mChildrenCount; 2407 final View[] children = mChildren; 2408 for (int i = 0; i < count; i++) { 2409 final View child = children[i]; 2410 child.dispatchAttachedToWindow(info, 2411 visibility | (child.mViewFlags&VISIBILITY_MASK)); 2412 } 2413 } 2414 2415 @Override 2416 void dispatchScreenStateChanged(int screenState) { 2417 super.dispatchScreenStateChanged(screenState); 2418 2419 final int count = mChildrenCount; 2420 final View[] children = mChildren; 2421 for (int i = 0; i < count; i++) { 2422 children[i].dispatchScreenStateChanged(screenState); 2423 } 2424 } 2425 2426 @Override 2427 boolean dispatchPopulateAccessibilityEventInternal(AccessibilityEvent event) { 2428 boolean handled = false; 2429 if (includeForAccessibility()) { 2430 handled = super.dispatchPopulateAccessibilityEventInternal(event); 2431 if (handled) { 2432 return handled; 2433 } 2434 } 2435 // Let our children have a shot in populating the event. 2436 ChildListForAccessibility children = ChildListForAccessibility.obtain(this, true); 2437 final int childCount = children.getChildCount(); 2438 for (int i = 0; i < childCount; i++) { 2439 View child = children.getChildAt(i); 2440 if ((child.mViewFlags & VISIBILITY_MASK) == VISIBLE) { 2441 handled = child.dispatchPopulateAccessibilityEvent(event); 2442 if (handled) { 2443 children.recycle(); 2444 return handled; 2445 } 2446 } 2447 } 2448 children.recycle(); 2449 return false; 2450 } 2451 2452 @Override 2453 void onInitializeAccessibilityNodeInfoInternal(AccessibilityNodeInfo info) { 2454 super.onInitializeAccessibilityNodeInfoInternal(info); 2455 if (mAttachInfo != null) { 2456 ArrayList<View> childrenForAccessibility = mAttachInfo.mTempArrayList; 2457 childrenForAccessibility.clear(); 2458 addChildrenForAccessibility(childrenForAccessibility); 2459 final int childrenForAccessibilityCount = childrenForAccessibility.size(); 2460 for (int i = 0; i < childrenForAccessibilityCount; i++) { 2461 View child = childrenForAccessibility.get(i); 2462 info.addChild(child); 2463 } 2464 childrenForAccessibility.clear(); 2465 } 2466 } 2467 2468 @Override 2469 void onInitializeAccessibilityEventInternal(AccessibilityEvent event) { 2470 super.onInitializeAccessibilityEventInternal(event); 2471 event.setClassName(ViewGroup.class.getName()); 2472 } 2473 2474 /** 2475 * @hide 2476 */ 2477 @Override 2478 public void resetAccessibilityStateChanged() { 2479 super.resetAccessibilityStateChanged(); 2480 View[] children = mChildren; 2481 final int childCount = mChildrenCount; 2482 for (int i = 0; i < childCount; i++) { 2483 View child = children[i]; 2484 child.resetAccessibilityStateChanged(); 2485 } 2486 } 2487 2488 /** 2489 * {@inheritDoc} 2490 */ 2491 @Override 2492 void dispatchDetachedFromWindow() { 2493 // If we still have a touch target, we are still in the process of 2494 // dispatching motion events to a child; we need to get rid of that 2495 // child to avoid dispatching events to it after the window is torn 2496 // down. To make sure we keep the child in a consistent state, we 2497 // first send it an ACTION_CANCEL motion event. 2498 cancelAndClearTouchTargets(null); 2499 2500 // Similarly, set ACTION_EXIT to all hover targets and clear them. 2501 exitHoverTargets(); 2502 2503 // In case view is detached while transition is running 2504 mLayoutSuppressed = false; 2505 2506 // Tear down our drag tracking 2507 mDragNotifiedChildren = null; 2508 if (mCurrentDrag != null) { 2509 mCurrentDrag.recycle(); 2510 mCurrentDrag = null; 2511 } 2512 2513 final int count = mChildrenCount; 2514 final View[] children = mChildren; 2515 for (int i = 0; i < count; i++) { 2516 children[i].dispatchDetachedFromWindow(); 2517 } 2518 super.dispatchDetachedFromWindow(); 2519 } 2520 2521 /** 2522 * {@inheritDoc} 2523 */ 2524 @Override 2525 public void setPadding(int left, int top, int right, int bottom) { 2526 super.setPadding(left, top, right, bottom); 2527 2528 if ((mPaddingLeft | mPaddingTop | mPaddingRight | mPaddingBottom) != 0) { 2529 mGroupFlags |= FLAG_PADDING_NOT_NULL; 2530 } else { 2531 mGroupFlags &= ~FLAG_PADDING_NOT_NULL; 2532 } 2533 } 2534 2535 /** 2536 * {@inheritDoc} 2537 */ 2538 @Override 2539 protected void dispatchSaveInstanceState(SparseArray<Parcelable> container) { 2540 super.dispatchSaveInstanceState(container); 2541 final int count = mChildrenCount; 2542 final View[] children = mChildren; 2543 for (int i = 0; i < count; i++) { 2544 View c = children[i]; 2545 if ((c.mViewFlags & PARENT_SAVE_DISABLED_MASK) != PARENT_SAVE_DISABLED) { 2546 c.dispatchSaveInstanceState(container); 2547 } 2548 } 2549 } 2550 2551 /** 2552 * Perform dispatching of a {@link #saveHierarchyState(android.util.SparseArray)} freeze()} 2553 * to only this view, not to its children. For use when overriding 2554 * {@link #dispatchSaveInstanceState(android.util.SparseArray)} dispatchFreeze()} to allow 2555 * subclasses to freeze their own state but not the state of their children. 2556 * 2557 * @param container the container 2558 */ 2559 protected void dispatchFreezeSelfOnly(SparseArray<Parcelable> container) { 2560 super.dispatchSaveInstanceState(container); 2561 } 2562 2563 /** 2564 * {@inheritDoc} 2565 */ 2566 @Override 2567 protected void dispatchRestoreInstanceState(SparseArray<Parcelable> container) { 2568 super.dispatchRestoreInstanceState(container); 2569 final int count = mChildrenCount; 2570 final View[] children = mChildren; 2571 for (int i = 0; i < count; i++) { 2572 View c = children[i]; 2573 if ((c.mViewFlags & PARENT_SAVE_DISABLED_MASK) != PARENT_SAVE_DISABLED) { 2574 c.dispatchRestoreInstanceState(container); 2575 } 2576 } 2577 } 2578 2579 /** 2580 * Perform dispatching of a {@link #restoreHierarchyState(android.util.SparseArray)} 2581 * to only this view, not to its children. For use when overriding 2582 * {@link #dispatchRestoreInstanceState(android.util.SparseArray)} to allow 2583 * subclasses to thaw their own state but not the state of their children. 2584 * 2585 * @param container the container 2586 */ 2587 protected void dispatchThawSelfOnly(SparseArray<Parcelable> container) { 2588 super.dispatchRestoreInstanceState(container); 2589 } 2590 2591 /** 2592 * Enables or disables the drawing cache for each child of this view group. 2593 * 2594 * @param enabled true to enable the cache, false to dispose of it 2595 */ 2596 protected void setChildrenDrawingCacheEnabled(boolean enabled) { 2597 if (enabled || (mPersistentDrawingCache & PERSISTENT_ALL_CACHES) != PERSISTENT_ALL_CACHES) { 2598 final View[] children = mChildren; 2599 final int count = mChildrenCount; 2600 for (int i = 0; i < count; i++) { 2601 children[i].setDrawingCacheEnabled(enabled); 2602 } 2603 } 2604 } 2605 2606 @Override 2607 protected void onAnimationStart() { 2608 super.onAnimationStart(); 2609 2610 // When this ViewGroup's animation starts, build the cache for the children 2611 if ((mGroupFlags & FLAG_ANIMATION_CACHE) == FLAG_ANIMATION_CACHE) { 2612 final int count = mChildrenCount; 2613 final View[] children = mChildren; 2614 final boolean buildCache = !isHardwareAccelerated(); 2615 2616 for (int i = 0; i < count; i++) { 2617 final View child = children[i]; 2618 if ((child.mViewFlags & VISIBILITY_MASK) == VISIBLE) { 2619 child.setDrawingCacheEnabled(true); 2620 if (buildCache) { 2621 child.buildDrawingCache(true); 2622 } 2623 } 2624 } 2625 2626 mGroupFlags |= FLAG_CHILDREN_DRAWN_WITH_CACHE; 2627 } 2628 } 2629 2630 @Override 2631 protected void onAnimationEnd() { 2632 super.onAnimationEnd(); 2633 2634 // When this ViewGroup's animation ends, destroy the cache of the children 2635 if ((mGroupFlags & FLAG_ANIMATION_CACHE) == FLAG_ANIMATION_CACHE) { 2636 mGroupFlags &= ~FLAG_CHILDREN_DRAWN_WITH_CACHE; 2637 2638 if ((mPersistentDrawingCache & PERSISTENT_ANIMATION_CACHE) == 0) { 2639 setChildrenDrawingCacheEnabled(false); 2640 } 2641 } 2642 } 2643 2644 @Override 2645 Bitmap createSnapshot(Bitmap.Config quality, int backgroundColor, boolean skipChildren) { 2646 int count = mChildrenCount; 2647 int[] visibilities = null; 2648 2649 if (skipChildren) { 2650 visibilities = new int[count]; 2651 for (int i = 0; i < count; i++) { 2652 View child = getChildAt(i); 2653 visibilities[i] = child.getVisibility(); 2654 if (visibilities[i] == View.VISIBLE) { 2655 child.setVisibility(INVISIBLE); 2656 } 2657 } 2658 } 2659 2660 Bitmap b = super.createSnapshot(quality, backgroundColor, skipChildren); 2661 2662 if (skipChildren) { 2663 for (int i = 0; i < count; i++) { 2664 getChildAt(i).setVisibility(visibilities[i]); 2665 } 2666 } 2667 2668 return b; 2669 } 2670 2671 private static void drawRect(Canvas canvas, int x1, int y1, int x2, int y2, int color) { 2672 Paint paint = getDebugPaint(); 2673 paint.setColor(color); 2674 canvas.drawRect(x1, y1, x2 - 1, y2 - 1, paint); 2675 } 2676 2677 /** 2678 * @hide 2679 */ 2680 protected void onDebugDrawMargins(Canvas canvas) { 2681 for (int i = 0; i < getChildCount(); i++) { 2682 View c = getChildAt(i); 2683 c.getLayoutParams().onDebugDraw(c, canvas); 2684 } 2685 } 2686 2687 /** 2688 * @hide 2689 */ 2690 protected void onDebugDraw(Canvas canvas) { 2691 // Draw optical bounds 2692 if (getLayoutMode() == LAYOUT_BOUNDS) { 2693 for (int i = 0; i < getChildCount(); i++) { 2694 View c = getChildAt(i); 2695 Insets insets = c.getLayoutInsets(); 2696 drawRect(canvas, 2697 c.getLeft() + insets.left, 2698 c.getTop() + insets.top, 2699 c.getRight() - insets.right, 2700 c.getBottom() - insets.bottom, Color.RED); 2701 } 2702 } 2703 2704 // Draw margins 2705 onDebugDrawMargins(canvas); 2706 2707 // Draw bounds 2708 for (int i = 0; i < getChildCount(); i++) { 2709 View c = getChildAt(i); 2710 drawRect(canvas, c.getLeft(), c.getTop(), c.getRight(), c.getBottom(), Color.BLUE); 2711 } 2712 } 2713 2714 /** 2715 * {@inheritDoc} 2716 */ 2717 @Override 2718 protected void dispatchDraw(Canvas canvas) { 2719 final int count = mChildrenCount; 2720 final View[] children = mChildren; 2721 int flags = mGroupFlags; 2722 2723 if ((flags & FLAG_RUN_ANIMATION) != 0 && canAnimate()) { 2724 final boolean cache = (mGroupFlags & FLAG_ANIMATION_CACHE) == FLAG_ANIMATION_CACHE; 2725 2726 final boolean buildCache = !isHardwareAccelerated(); 2727 for (int i = 0; i < count; i++) { 2728 final View child = children[i]; 2729 if ((child.mViewFlags & VISIBILITY_MASK) == VISIBLE) { 2730 final LayoutParams params = child.getLayoutParams(); 2731 attachLayoutAnimationParameters(child, params, i, count); 2732 bindLayoutAnimation(child); 2733 if (cache) { 2734 child.setDrawingCacheEnabled(true); 2735 if (buildCache) { 2736 child.buildDrawingCache(true); 2737 } 2738 } 2739 } 2740 } 2741 2742 final LayoutAnimationController controller = mLayoutAnimationController; 2743 if (controller.willOverlap()) { 2744 mGroupFlags |= FLAG_OPTIMIZE_INVALIDATE; 2745 } 2746 2747 controller.start(); 2748 2749 mGroupFlags &= ~FLAG_RUN_ANIMATION; 2750 mGroupFlags &= ~FLAG_ANIMATION_DONE; 2751 2752 if (cache) { 2753 mGroupFlags |= FLAG_CHILDREN_DRAWN_WITH_CACHE; 2754 } 2755 2756 if (mAnimationListener != null) { 2757 mAnimationListener.onAnimationStart(controller.getAnimation()); 2758 } 2759 } 2760 2761 int saveCount = 0; 2762 final boolean clipToPadding = (flags & CLIP_TO_PADDING_MASK) == CLIP_TO_PADDING_MASK; 2763 if (clipToPadding) { 2764 saveCount = canvas.save(); 2765 canvas.clipRect(mScrollX + mPaddingLeft, mScrollY + mPaddingTop, 2766 mScrollX + mRight - mLeft - mPaddingRight, 2767 mScrollY + mBottom - mTop - mPaddingBottom); 2768 2769 } 2770 2771 // We will draw our child's animation, let's reset the flag 2772 mPrivateFlags &= ~DRAW_ANIMATION; 2773 mGroupFlags &= ~FLAG_INVALIDATE_REQUIRED; 2774 2775 boolean more = false; 2776 final long drawingTime = getDrawingTime(); 2777 2778 if ((flags & FLAG_USE_CHILD_DRAWING_ORDER) == 0) { 2779 for (int i = 0; i < count; i++) { 2780 final View child = children[i]; 2781 if ((child.mViewFlags & VISIBILITY_MASK) == VISIBLE || child.getAnimation() != null) { 2782 more |= drawChild(canvas, child, drawingTime); 2783 } 2784 } 2785 } else { 2786 for (int i = 0; i < count; i++) { 2787 final View child = children[getChildDrawingOrder(count, i)]; 2788 if ((child.mViewFlags & VISIBILITY_MASK) == VISIBLE || child.getAnimation() != null) { 2789 more |= drawChild(canvas, child, drawingTime); 2790 } 2791 } 2792 } 2793 2794 // Draw any disappearing views that have animations 2795 if (mDisappearingChildren != null) { 2796 final ArrayList<View> disappearingChildren = mDisappearingChildren; 2797 final int disappearingCount = disappearingChildren.size() - 1; 2798 // Go backwards -- we may delete as animations finish 2799 for (int i = disappearingCount; i >= 0; i--) { 2800 final View child = disappearingChildren.get(i); 2801 more |= drawChild(canvas, child, drawingTime); 2802 } 2803 } 2804 2805 if (debugDraw()) { 2806 onDebugDraw(canvas); 2807 } 2808 2809 if (clipToPadding) { 2810 canvas.restoreToCount(saveCount); 2811 } 2812 2813 // mGroupFlags might have been updated by drawChild() 2814 flags = mGroupFlags; 2815 2816 if ((flags & FLAG_INVALIDATE_REQUIRED) == FLAG_INVALIDATE_REQUIRED) { 2817 invalidate(true); 2818 } 2819 2820 if ((flags & FLAG_ANIMATION_DONE) == 0 && (flags & FLAG_NOTIFY_ANIMATION_LISTENER) == 0 && 2821 mLayoutAnimationController.isDone() && !more) { 2822 // We want to erase the drawing cache and notify the listener after the 2823 // next frame is drawn because one extra invalidate() is caused by 2824 // drawChild() after the animation is over 2825 mGroupFlags |= FLAG_NOTIFY_ANIMATION_LISTENER; 2826 final Runnable end = new Runnable() { 2827 public void run() { 2828 notifyAnimationListener(); 2829 } 2830 }; 2831 post(end); 2832 } 2833 } 2834 2835 /** 2836 * Returns the index of the child to draw for this iteration. Override this 2837 * if you want to change the drawing order of children. By default, it 2838 * returns i. 2839 * <p> 2840 * NOTE: In order for this method to be called, you must enable child ordering 2841 * first by calling {@link #setChildrenDrawingOrderEnabled(boolean)}. 2842 * 2843 * @param i The current iteration. 2844 * @return The index of the child to draw this iteration. 2845 * 2846 * @see #setChildrenDrawingOrderEnabled(boolean) 2847 * @see #isChildrenDrawingOrderEnabled() 2848 */ 2849 protected int getChildDrawingOrder(int childCount, int i) { 2850 return i; 2851 } 2852 2853 private void notifyAnimationListener() { 2854 mGroupFlags &= ~FLAG_NOTIFY_ANIMATION_LISTENER; 2855 mGroupFlags |= FLAG_ANIMATION_DONE; 2856 2857 if (mAnimationListener != null) { 2858 final Runnable end = new Runnable() { 2859 public void run() { 2860 mAnimationListener.onAnimationEnd(mLayoutAnimationController.getAnimation()); 2861 } 2862 }; 2863 post(end); 2864 } 2865 2866 if ((mGroupFlags & FLAG_ANIMATION_CACHE) == FLAG_ANIMATION_CACHE) { 2867 mGroupFlags &= ~FLAG_CHILDREN_DRAWN_WITH_CACHE; 2868 if ((mPersistentDrawingCache & PERSISTENT_ANIMATION_CACHE) == 0) { 2869 setChildrenDrawingCacheEnabled(false); 2870 } 2871 } 2872 2873 invalidate(true); 2874 } 2875 2876 /** 2877 * This method is used to cause children of this ViewGroup to restore or recreate their 2878 * display lists. It is called by getDisplayList() when the parent ViewGroup does not need 2879 * to recreate its own display list, which would happen if it went through the normal 2880 * draw/dispatchDraw mechanisms. 2881 * 2882 * @hide 2883 */ 2884 @Override 2885 protected void dispatchGetDisplayList() { 2886 final int count = mChildrenCount; 2887 final View[] children = mChildren; 2888 for (int i = 0; i < count; i++) { 2889 final View child = children[i]; 2890 if (((child.mViewFlags & VISIBILITY_MASK) == VISIBLE || child.getAnimation() != null) && 2891 child.hasStaticLayer()) { 2892 child.mRecreateDisplayList = (child.mPrivateFlags & INVALIDATED) == INVALIDATED; 2893 child.mPrivateFlags &= ~INVALIDATED; 2894 child.getDisplayList(); 2895 child.mRecreateDisplayList = false; 2896 } 2897 } 2898 } 2899 2900 /** 2901 * Draw one child of this View Group. This method is responsible for getting 2902 * the canvas in the right state. This includes clipping, translating so 2903 * that the child's scrolled origin is at 0, 0, and applying any animation 2904 * transformations. 2905 * 2906 * @param canvas The canvas on which to draw the child 2907 * @param child Who to draw 2908 * @param drawingTime The time at which draw is occurring 2909 * @return True if an invalidate() was issued 2910 */ 2911 protected boolean drawChild(Canvas canvas, View child, long drawingTime) { 2912 return child.draw(canvas, this, drawingTime); 2913 } 2914 2915 /** 2916 * 2917 * @param enabled True if children should be drawn with layers, false otherwise. 2918 * 2919 * @hide 2920 */ 2921 public void setChildrenLayersEnabled(boolean enabled) { 2922 if (enabled != mDrawLayers) { 2923 mDrawLayers = enabled; 2924 invalidate(true); 2925 2926 boolean flushLayers = !enabled; 2927 AttachInfo info = mAttachInfo; 2928 if (info != null && info.mHardwareRenderer != null && 2929 info.mHardwareRenderer.isEnabled()) { 2930 if (!info.mHardwareRenderer.validate()) { 2931 flushLayers = false; 2932 } 2933 } else { 2934 flushLayers = false; 2935 } 2936 2937 // We need to invalidate any child with a layer. For instance, 2938 // if a child is backed by a hardware layer and we disable layers 2939 // the child is marked as not dirty (flags cleared the last time 2940 // the child was drawn inside its layer.) However, that child might 2941 // never have created its own display list or have an obsolete 2942 // display list. By invalidating the child we ensure the display 2943 // list is in sync with the content of the hardware layer. 2944 for (int i = 0; i < mChildrenCount; i++) { 2945 View child = mChildren[i]; 2946 if (child.mLayerType != LAYER_TYPE_NONE) { 2947 if (flushLayers) child.flushLayer(); 2948 child.invalidate(true); 2949 } 2950 } 2951 } 2952 } 2953 2954 /** 2955 * By default, children are clipped to their bounds before drawing. This 2956 * allows view groups to override this behavior for animations, etc. 2957 * 2958 * @param clipChildren true to clip children to their bounds, 2959 * false otherwise 2960 * @attr ref android.R.styleable#ViewGroup_clipChildren 2961 */ 2962 public void setClipChildren(boolean clipChildren) { 2963 boolean previousValue = (mGroupFlags & FLAG_CLIP_CHILDREN) == FLAG_CLIP_CHILDREN; 2964 if (clipChildren != previousValue) { 2965 setBooleanFlag(FLAG_CLIP_CHILDREN, clipChildren); 2966 for (int i = 0; i < mChildrenCount; ++i) { 2967 View child = getChildAt(i); 2968 if (child.mDisplayList != null) { 2969 child.mDisplayList.setClipChildren(clipChildren); 2970 } 2971 } 2972 } 2973 } 2974 2975 /** 2976 * By default, children are clipped to the padding of the ViewGroup. This 2977 * allows view groups to override this behavior 2978 * 2979 * @param clipToPadding true to clip children to the padding of the 2980 * group, false otherwise 2981 * @attr ref android.R.styleable#ViewGroup_clipToPadding 2982 */ 2983 public void setClipToPadding(boolean clipToPadding) { 2984 setBooleanFlag(FLAG_CLIP_TO_PADDING, clipToPadding); 2985 } 2986 2987 /** 2988 * {@inheritDoc} 2989 */ 2990 @Override 2991 public void dispatchSetSelected(boolean selected) { 2992 final View[] children = mChildren; 2993 final int count = mChildrenCount; 2994 for (int i = 0; i < count; i++) { 2995 children[i].setSelected(selected); 2996 } 2997 } 2998 2999 /** 3000 * {@inheritDoc} 3001 */ 3002 @Override 3003 public void dispatchSetActivated(boolean activated) { 3004 final View[] children = mChildren; 3005 final int count = mChildrenCount; 3006 for (int i = 0; i < count; i++) { 3007 children[i].setActivated(activated); 3008 } 3009 } 3010 3011 @Override 3012 protected void dispatchSetPressed(boolean pressed) { 3013 final View[] children = mChildren; 3014 final int count = mChildrenCount; 3015 for (int i = 0; i < count; i++) { 3016 final View child = children[i]; 3017 // Children that are clickable on their own should not 3018 // show a pressed state when their parent view does. 3019 // Clearing a pressed state always propagates. 3020 if (!pressed || (!child.isClickable() && !child.isLongClickable())) { 3021 child.setPressed(pressed); 3022 } 3023 } 3024 } 3025 3026 /** 3027 * When this property is set to true, this ViewGroup supports static transformations on 3028 * children; this causes 3029 * {@link #getChildStaticTransformation(View, android.view.animation.Transformation)} to be 3030 * invoked when a child is drawn. 3031 * 3032 * Any subclass overriding 3033 * {@link #getChildStaticTransformation(View, android.view.animation.Transformation)} should 3034 * set this property to true. 3035 * 3036 * @param enabled True to enable static transformations on children, false otherwise. 3037 * 3038 * @see #FLAG_SUPPORT_STATIC_TRANSFORMATIONS 3039 */ 3040 protected void setStaticTransformationsEnabled(boolean enabled) { 3041 setBooleanFlag(FLAG_SUPPORT_STATIC_TRANSFORMATIONS, enabled); 3042 } 3043 3044 /** 3045 * Sets <code>t</code> to be the static transformation of the child, if set, returning a 3046 * boolean to indicate whether a static transform was set. The default implementation 3047 * simply returns <code>false</code>; subclasses may override this method for different 3048 * behavior. 3049 * 3050 * @param child The child view whose static transform is being requested 3051 * @param t The Transformation which will hold the result 3052 * @return true if the transformation was set, false otherwise 3053 * @see #setStaticTransformationsEnabled(boolean) 3054 */ 3055 protected boolean getChildStaticTransformation(View child, Transformation t) { 3056 return false; 3057 } 3058 3059 /** 3060 * {@hide} 3061 */ 3062 @Override 3063 protected View findViewTraversal(int id) { 3064 if (id == mID) { 3065 return this; 3066 } 3067 3068 final View[] where = mChildren; 3069 final int len = mChildrenCount; 3070 3071 for (int i = 0; i < len; i++) { 3072 View v = where[i]; 3073 3074 if ((v.mPrivateFlags & IS_ROOT_NAMESPACE) == 0) { 3075 v = v.findViewById(id); 3076 3077 if (v != null) { 3078 return v; 3079 } 3080 } 3081 } 3082 3083 return null; 3084 } 3085 3086 /** 3087 * {@hide} 3088 */ 3089 @Override 3090 protected View findViewWithTagTraversal(Object tag) { 3091 if (tag != null && tag.equals(mTag)) { 3092 return this; 3093 } 3094 3095 final View[] where = mChildren; 3096 final int len = mChildrenCount; 3097 3098 for (int i = 0; i < len; i++) { 3099 View v = where[i]; 3100 3101 if ((v.mPrivateFlags & IS_ROOT_NAMESPACE) == 0) { 3102 v = v.findViewWithTag(tag); 3103 3104 if (v != null) { 3105 return v; 3106 } 3107 } 3108 } 3109 3110 return null; 3111 } 3112 3113 /** 3114 * {@hide} 3115 */ 3116 @Override 3117 protected View findViewByPredicateTraversal(Predicate<View> predicate, View childToSkip) { 3118 if (predicate.apply(this)) { 3119 return this; 3120 } 3121 3122 final View[] where = mChildren; 3123 final int len = mChildrenCount; 3124 3125 for (int i = 0; i < len; i++) { 3126 View v = where[i]; 3127 3128 if (v != childToSkip && (v.mPrivateFlags & IS_ROOT_NAMESPACE) == 0) { 3129 v = v.findViewByPredicate(predicate); 3130 3131 if (v != null) { 3132 return v; 3133 } 3134 } 3135 } 3136 3137 return null; 3138 } 3139 3140 /** 3141 * Adds a child view. If no layout parameters are already set on the child, the 3142 * default parameters for this ViewGroup are set on the child. 3143 * 3144 * @param child the child view to add 3145 * 3146 * @see #generateDefaultLayoutParams() 3147 */ 3148 public void addView(View child) { 3149 addView(child, -1); 3150 } 3151 3152 /** 3153 * Adds a child view. If no layout parameters are already set on the child, the 3154 * default parameters for this ViewGroup are set on the child. 3155 * 3156 * @param child the child view to add 3157 * @param index the position at which to add the child 3158 * 3159 * @see #generateDefaultLayoutParams() 3160 */ 3161 public void addView(View child, int index) { 3162 LayoutParams params = child.getLayoutParams(); 3163 if (params == null) { 3164 params = generateDefaultLayoutParams(); 3165 if (params == null) { 3166 throw new IllegalArgumentException("generateDefaultLayoutParams() cannot return null"); 3167 } 3168 } 3169 addView(child, index, params); 3170 } 3171 3172 /** 3173 * Adds a child view with this ViewGroup's default layout parameters and the 3174 * specified width and height. 3175 * 3176 * @param child the child view to add 3177 */ 3178 public void addView(View child, int width, int height) { 3179 final LayoutParams params = generateDefaultLayoutParams(); 3180 params.width = width; 3181 params.height = height; 3182 addView(child, -1, params); 3183 } 3184 3185 /** 3186 * Adds a child view with the specified layout parameters. 3187 * 3188 * @param child the child view to add 3189 * @param params the layout parameters to set on the child 3190 */ 3191 public void addView(View child, LayoutParams params) { 3192 addView(child, -1, params); 3193 } 3194 3195 /** 3196 * Adds a child view with the specified layout parameters. 3197 * 3198 * @param child the child view to add 3199 * @param index the position at which to add the child 3200 * @param params the layout parameters to set on the child 3201 */ 3202 public void addView(View child, int index, LayoutParams params) { 3203 if (DBG) { 3204 System.out.println(this + " addView"); 3205 } 3206 3207 // addViewInner() will call child.requestLayout() when setting the new LayoutParams 3208 // therefore, we call requestLayout() on ourselves before, so that the child's request 3209 // will be blocked at our level 3210 requestLayout(); 3211 invalidate(true); 3212 addViewInner(child, index, params, false); 3213 } 3214 3215 /** 3216 * {@inheritDoc} 3217 */ 3218 public void updateViewLayout(View view, ViewGroup.LayoutParams params) { 3219 if (!checkLayoutParams(params)) { 3220 throw new IllegalArgumentException("Invalid LayoutParams supplied to " + this); 3221 } 3222 if (view.mParent != this) { 3223 throw new IllegalArgumentException("Given view not a child of " + this); 3224 } 3225 view.setLayoutParams(params); 3226 } 3227 3228 /** 3229 * {@inheritDoc} 3230 */ 3231 protected boolean checkLayoutParams(ViewGroup.LayoutParams p) { 3232 return p != null; 3233 } 3234 3235 /** 3236 * Interface definition for a callback to be invoked when the hierarchy 3237 * within this view changed. The hierarchy changes whenever a child is added 3238 * to or removed from this view. 3239 */ 3240 public interface OnHierarchyChangeListener { 3241 /** 3242 * Called when a new child is added to a parent view. 3243 * 3244 * @param parent the view in which a child was added 3245 * @param child the new child view added in the hierarchy 3246 */ 3247 void onChildViewAdded(View parent, View child); 3248 3249 /** 3250 * Called when a child is removed from a parent view. 3251 * 3252 * @param parent the view from which the child was removed 3253 * @param child the child removed from the hierarchy 3254 */ 3255 void onChildViewRemoved(View parent, View child); 3256 } 3257 3258 /** 3259 * Register a callback to be invoked when a child is added to or removed 3260 * from this view. 3261 * 3262 * @param listener the callback to invoke on hierarchy change 3263 */ 3264 public void setOnHierarchyChangeListener(OnHierarchyChangeListener listener) { 3265 mOnHierarchyChangeListener = listener; 3266 } 3267 3268 /** 3269 * @hide 3270 */ 3271 protected void onViewAdded(View child) { 3272 if (mOnHierarchyChangeListener != null) { 3273 mOnHierarchyChangeListener.onChildViewAdded(this, child); 3274 } 3275 } 3276 3277 /** 3278 * @hide 3279 */ 3280 protected void onViewRemoved(View child) { 3281 if (mOnHierarchyChangeListener != null) { 3282 mOnHierarchyChangeListener.onChildViewRemoved(this, child); 3283 } 3284 } 3285 3286 /** 3287 * Adds a view during layout. This is useful if in your onLayout() method, 3288 * you need to add more views (as does the list view for example). 3289 * 3290 * If index is negative, it means put it at the end of the list. 3291 * 3292 * @param child the view to add to the group 3293 * @param index the index at which the child must be added 3294 * @param params the layout parameters to associate with the child 3295 * @return true if the child was added, false otherwise 3296 */ 3297 protected boolean addViewInLayout(View child, int index, LayoutParams params) { 3298 return addViewInLayout(child, index, params, false); 3299 } 3300 3301 /** 3302 * Adds a view during layout. This is useful if in your onLayout() method, 3303 * you need to add more views (as does the list view for example). 3304 * 3305 * If index is negative, it means put it at the end of the list. 3306 * 3307 * @param child the view to add to the group 3308 * @param index the index at which the child must be added 3309 * @param params the layout parameters to associate with the child 3310 * @param preventRequestLayout if true, calling this method will not trigger a 3311 * layout request on child 3312 * @return true if the child was added, false otherwise 3313 */ 3314 protected boolean addViewInLayout(View child, int index, LayoutParams params, 3315 boolean preventRequestLayout) { 3316 child.mParent = null; 3317 addViewInner(child, index, params, preventRequestLayout); 3318 child.mPrivateFlags = (child.mPrivateFlags & ~DIRTY_MASK) | DRAWN; 3319 return true; 3320 } 3321 3322 /** 3323 * Prevents the specified child to be laid out during the next layout pass. 3324 * 3325 * @param child the child on which to perform the cleanup 3326 */ 3327 protected void cleanupLayoutState(View child) { 3328 child.mPrivateFlags &= ~View.FORCE_LAYOUT; 3329 } 3330 3331 private void addViewInner(View child, int index, LayoutParams params, 3332 boolean preventRequestLayout) { 3333 3334 if (mTransition != null) { 3335 // Don't prevent other add transitions from completing, but cancel remove 3336 // transitions to let them complete the process before we add to the container 3337 mTransition.cancel(LayoutTransition.DISAPPEARING); 3338 } 3339 3340 if (child.getParent() != null) { 3341 throw new IllegalStateException("The specified child already has a parent. " + 3342 "You must call removeView() on the child's parent first."); 3343 } 3344 3345 if (mTransition != null) { 3346 mTransition.addChild(this, child); 3347 } 3348 3349 if (!checkLayoutParams(params)) { 3350 params = generateLayoutParams(params); 3351 } 3352 3353 if (preventRequestLayout) { 3354 child.mLayoutParams = params; 3355 } else { 3356 child.setLayoutParams(params); 3357 } 3358 3359 if (index < 0) { 3360 index = mChildrenCount; 3361 } 3362 3363 addInArray(child, index); 3364 3365 // tell our children 3366 if (preventRequestLayout) { 3367 child.assignParent(this); 3368 } else { 3369 child.mParent = this; 3370 } 3371 3372 if (child.hasFocus()) { 3373 requestChildFocus(child, child.findFocus()); 3374 } 3375 3376 AttachInfo ai = mAttachInfo; 3377 if (ai != null && (mGroupFlags & FLAG_PREVENT_DISPATCH_ATTACHED_TO_WINDOW) == 0) { 3378 boolean lastKeepOn = ai.mKeepScreenOn; 3379 ai.mKeepScreenOn = false; 3380 child.dispatchAttachedToWindow(mAttachInfo, (mViewFlags&VISIBILITY_MASK)); 3381 if (ai.mKeepScreenOn) { 3382 needGlobalAttributesUpdate(true); 3383 } 3384 ai.mKeepScreenOn = lastKeepOn; 3385 } 3386 3387 onViewAdded(child); 3388 3389 if ((child.mViewFlags & DUPLICATE_PARENT_STATE) == DUPLICATE_PARENT_STATE) { 3390 mGroupFlags |= FLAG_NOTIFY_CHILDREN_ON_DRAWABLE_STATE_CHANGE; 3391 } 3392 3393 if (child.hasTransientState()) { 3394 childHasTransientStateChanged(child, true); 3395 } 3396 } 3397 3398 private void addInArray(View child, int index) { 3399 View[] children = mChildren; 3400 final int count = mChildrenCount; 3401 final int size = children.length; 3402 if (index == count) { 3403 if (size == count) { 3404 mChildren = new View[size + ARRAY_CAPACITY_INCREMENT]; 3405 System.arraycopy(children, 0, mChildren, 0, size); 3406 children = mChildren; 3407 } 3408 children[mChildrenCount++] = child; 3409 } else if (index < count) { 3410 if (size == count) { 3411 mChildren = new View[size + ARRAY_CAPACITY_INCREMENT]; 3412 System.arraycopy(children, 0, mChildren, 0, index); 3413 System.arraycopy(children, index, mChildren, index + 1, count - index); 3414 children = mChildren; 3415 } else { 3416 System.arraycopy(children, index, children, index + 1, count - index); 3417 } 3418 children[index] = child; 3419 mChildrenCount++; 3420 if (mLastTouchDownIndex >= index) { 3421 mLastTouchDownIndex++; 3422 } 3423 } else { 3424 throw new IndexOutOfBoundsException("index=" + index + " count=" + count); 3425 } 3426 } 3427 3428 // This method also sets the child's mParent to null 3429 private void removeFromArray(int index) { 3430 final View[] children = mChildren; 3431 if (!(mTransitioningViews != null && mTransitioningViews.contains(children[index]))) { 3432 children[index].mParent = null; 3433 } 3434 final int count = mChildrenCount; 3435 if (index == count - 1) { 3436 children[--mChildrenCount] = null; 3437 } else if (index >= 0 && index < count) { 3438 System.arraycopy(children, index + 1, children, index, count - index - 1); 3439 children[--mChildrenCount] = null; 3440 } else { 3441 throw new IndexOutOfBoundsException(); 3442 } 3443 if (mLastTouchDownIndex == index) { 3444 mLastTouchDownTime = 0; 3445 mLastTouchDownIndex = -1; 3446 } else if (mLastTouchDownIndex > index) { 3447 mLastTouchDownIndex--; 3448 } 3449 } 3450 3451 // This method also sets the children's mParent to null 3452 private void removeFromArray(int start, int count) { 3453 final View[] children = mChildren; 3454 final int childrenCount = mChildrenCount; 3455 3456 start = Math.max(0, start); 3457 final int end = Math.min(childrenCount, start + count); 3458 3459 if (start == end) { 3460 return; 3461 } 3462 3463 if (end == childrenCount) { 3464 for (int i = start; i < end; i++) { 3465 children[i].mParent = null; 3466 children[i] = null; 3467 } 3468 } else { 3469 for (int i = start; i < end; i++) { 3470 children[i].mParent = null; 3471 } 3472 3473 // Since we're looping above, we might as well do the copy, but is arraycopy() 3474 // faster than the extra 2 bounds checks we would do in the loop? 3475 System.arraycopy(children, end, children, start, childrenCount - end); 3476 3477 for (int i = childrenCount - (end - start); i < childrenCount; i++) { 3478 children[i] = null; 3479 } 3480 } 3481 3482 mChildrenCount -= (end - start); 3483 } 3484 3485 private void bindLayoutAnimation(View child) { 3486 Animation a = mLayoutAnimationController.getAnimationForView(child); 3487 child.setAnimation(a); 3488 } 3489 3490 /** 3491 * Subclasses should override this method to set layout animation 3492 * parameters on the supplied child. 3493 * 3494 * @param child the child to associate with animation parameters 3495 * @param params the child's layout parameters which hold the animation 3496 * parameters 3497 * @param index the index of the child in the view group 3498 * @param count the number of children in the view group 3499 */ 3500 protected void attachLayoutAnimationParameters(View child, 3501 LayoutParams params, int index, int count) { 3502 LayoutAnimationController.AnimationParameters animationParams = 3503 params.layoutAnimationParameters; 3504 if (animationParams == null) { 3505 animationParams = new LayoutAnimationController.AnimationParameters(); 3506 params.layoutAnimationParameters = animationParams; 3507 } 3508 3509 animationParams.count = count; 3510 animationParams.index = index; 3511 } 3512 3513 /** 3514 * {@inheritDoc} 3515 */ 3516 public void removeView(View view) { 3517 removeViewInternal(view); 3518 requestLayout(); 3519 invalidate(true); 3520 } 3521 3522 /** 3523 * Removes a view during layout. This is useful if in your onLayout() method, 3524 * you need to remove more views. 3525 * 3526 * @param view the view to remove from the group 3527 */ 3528 public void removeViewInLayout(View view) { 3529 removeViewInternal(view); 3530 } 3531 3532 /** 3533 * Removes a range of views during layout. This is useful if in your onLayout() method, 3534 * you need to remove more views. 3535 * 3536 * @param start the index of the first view to remove from the group 3537 * @param count the number of views to remove from the group 3538 */ 3539 public void removeViewsInLayout(int start, int count) { 3540 removeViewsInternal(start, count); 3541 } 3542 3543 /** 3544 * Removes the view at the specified position in the group. 3545 * 3546 * @param index the position in the group of the view to remove 3547 */ 3548 public void removeViewAt(int index) { 3549 removeViewInternal(index, getChildAt(index)); 3550 requestLayout(); 3551 invalidate(true); 3552 } 3553 3554 /** 3555 * Removes the specified range of views from the group. 3556 * 3557 * @param start the first position in the group of the range of views to remove 3558 * @param count the number of views to remove 3559 */ 3560 public void removeViews(int start, int count) { 3561 removeViewsInternal(start, count); 3562 requestLayout(); 3563 invalidate(true); 3564 } 3565 3566 private void removeViewInternal(View view) { 3567 final int index = indexOfChild(view); 3568 if (index >= 0) { 3569 removeViewInternal(index, view); 3570 } 3571 } 3572 3573 private void removeViewInternal(int index, View view) { 3574 3575 if (mTransition != null) { 3576 mTransition.removeChild(this, view); 3577 } 3578 3579 boolean clearChildFocus = false; 3580 if (view == mFocused) { 3581 view.unFocus(); 3582 clearChildFocus = true; 3583 } 3584 3585 cancelTouchTarget(view); 3586 cancelHoverTarget(view); 3587 3588 if (view.getAnimation() != null || 3589 (mTransitioningViews != null && mTransitioningViews.contains(view))) { 3590 addDisappearingView(view); 3591 } else if (view.mAttachInfo != null) { 3592 view.dispatchDetachedFromWindow(); 3593 } 3594 3595 if (view.hasTransientState()) { 3596 childHasTransientStateChanged(view, false); 3597 } 3598 3599 onViewRemoved(view); 3600 3601 needGlobalAttributesUpdate(false); 3602 3603 removeFromArray(index); 3604 3605 if (clearChildFocus) { 3606 clearChildFocus(view); 3607 ensureInputFocusOnFirstFocusable(); 3608 } 3609 3610 if (view.isAccessibilityFocused()) { 3611 view.clearAccessibilityFocus(); 3612 } 3613 } 3614 3615 /** 3616 * Sets the LayoutTransition object for this ViewGroup. If the LayoutTransition object is 3617 * not null, changes in layout which occur because of children being added to or removed from 3618 * the ViewGroup will be animated according to the animations defined in that LayoutTransition 3619 * object. By default, the transition object is null (so layout changes are not animated). 3620 * 3621 * @param transition The LayoutTransition object that will animated changes in layout. A value 3622 * of <code>null</code> means no transition will run on layout changes. 3623 * @attr ref android.R.styleable#ViewGroup_animateLayoutChanges 3624 */ 3625 public void setLayoutTransition(LayoutTransition transition) { 3626 if (mTransition != null) { 3627 mTransition.removeTransitionListener(mLayoutTransitionListener); 3628 } 3629 mTransition = transition; 3630 if (mTransition != null) { 3631 mTransition.addTransitionListener(mLayoutTransitionListener); 3632 } 3633 } 3634 3635 /** 3636 * Gets the LayoutTransition object for this ViewGroup. If the LayoutTransition object is 3637 * not null, changes in layout which occur because of children being added to or removed from 3638 * the ViewGroup will be animated according to the animations defined in that LayoutTransition 3639 * object. By default, the transition object is null (so layout changes are not animated). 3640 * 3641 * @return LayoutTranstion The LayoutTransition object that will animated changes in layout. 3642 * A value of <code>null</code> means no transition will run on layout changes. 3643 */ 3644 public LayoutTransition getLayoutTransition() { 3645 return mTransition; 3646 } 3647 3648 private void removeViewsInternal(int start, int count) { 3649 final View focused = mFocused; 3650 final boolean detach = mAttachInfo != null; 3651 View clearChildFocus = null; 3652 3653 final View[] children = mChildren; 3654 final int end = start + count; 3655 3656 for (int i = start; i < end; i++) { 3657 final View view = children[i]; 3658 3659 if (mTransition != null) { 3660 mTransition.removeChild(this, view); 3661 } 3662 3663 if (view == focused) { 3664 view.unFocus(); 3665 clearChildFocus = view; 3666 } 3667 3668 cancelTouchTarget(view); 3669 cancelHoverTarget(view); 3670 3671 if (view.getAnimation() != null || 3672 (mTransitioningViews != null && mTransitioningViews.contains(view))) { 3673 addDisappearingView(view); 3674 } else if (detach) { 3675 view.dispatchDetachedFromWindow(); 3676 } 3677 3678 if (view.hasTransientState()) { 3679 childHasTransientStateChanged(view, false); 3680 } 3681 3682 needGlobalAttributesUpdate(false); 3683 3684 onViewRemoved(view); 3685 } 3686 3687 removeFromArray(start, count); 3688 3689 if (clearChildFocus != null) { 3690 clearChildFocus(clearChildFocus); 3691 ensureInputFocusOnFirstFocusable(); 3692 } 3693 } 3694 3695 /** 3696 * Call this method to remove all child views from the 3697 * ViewGroup. 3698 */ 3699 public void removeAllViews() { 3700 removeAllViewsInLayout(); 3701 requestLayout(); 3702 invalidate(true); 3703 } 3704 3705 /** 3706 * Called by a ViewGroup subclass to remove child views from itself, 3707 * when it must first know its size on screen before it can calculate how many 3708 * child views it will render. An example is a Gallery or a ListView, which 3709 * may "have" 50 children, but actually only render the number of children 3710 * that can currently fit inside the object on screen. Do not call 3711 * this method unless you are extending ViewGroup and understand the 3712 * view measuring and layout pipeline. 3713 */ 3714 public void removeAllViewsInLayout() { 3715 final int count = mChildrenCount; 3716 if (count <= 0) { 3717 return; 3718 } 3719 3720 final View[] children = mChildren; 3721 mChildrenCount = 0; 3722 3723 final View focused = mFocused; 3724 final boolean detach = mAttachInfo != null; 3725 View clearChildFocus = null; 3726 3727 needGlobalAttributesUpdate(false); 3728 3729 for (int i = count - 1; i >= 0; i--) { 3730 final View view = children[i]; 3731 3732 if (mTransition != null) { 3733 mTransition.removeChild(this, view); 3734 } 3735 3736 if (view == focused) { 3737 view.unFocus(); 3738 clearChildFocus = view; 3739 } 3740 3741 cancelTouchTarget(view); 3742 cancelHoverTarget(view); 3743 3744 if (view.getAnimation() != null || 3745 (mTransitioningViews != null && mTransitioningViews.contains(view))) { 3746 addDisappearingView(view); 3747 } else if (detach) { 3748 view.dispatchDetachedFromWindow(); 3749 } 3750 3751 if (view.hasTransientState()) { 3752 childHasTransientStateChanged(view, false); 3753 } 3754 3755 onViewRemoved(view); 3756 3757 view.mParent = null; 3758 children[i] = null; 3759 } 3760 3761 if (clearChildFocus != null) { 3762 clearChildFocus(clearChildFocus); 3763 ensureInputFocusOnFirstFocusable(); 3764 } 3765 } 3766 3767 /** 3768 * Finishes the removal of a detached view. This method will dispatch the detached from 3769 * window event and notify the hierarchy change listener. 3770 * 3771 * @param child the child to be definitely removed from the view hierarchy 3772 * @param animate if true and the view has an animation, the view is placed in the 3773 * disappearing views list, otherwise, it is detached from the window 3774 * 3775 * @see #attachViewToParent(View, int, android.view.ViewGroup.LayoutParams) 3776 * @see #detachAllViewsFromParent() 3777 * @see #detachViewFromParent(View) 3778 * @see #detachViewFromParent(int) 3779 */ 3780 protected void removeDetachedView(View child, boolean animate) { 3781 if (mTransition != null) { 3782 mTransition.removeChild(this, child); 3783 } 3784 3785 if (child == mFocused) { 3786 child.clearFocus(); 3787 } 3788 3789 cancelTouchTarget(child); 3790 cancelHoverTarget(child); 3791 3792 if ((animate && child.getAnimation() != null) || 3793 (mTransitioningViews != null && mTransitioningViews.contains(child))) { 3794 addDisappearingView(child); 3795 } else if (child.mAttachInfo != null) { 3796 child.dispatchDetachedFromWindow(); 3797 } 3798 3799 if (child.hasTransientState()) { 3800 childHasTransientStateChanged(child, false); 3801 } 3802 3803 onViewRemoved(child); 3804 } 3805 3806 /** 3807 * Attaches a view to this view group. Attaching a view assigns this group as the parent, 3808 * sets the layout parameters and puts the view in the list of children so it can be retrieved 3809 * by calling {@link #getChildAt(int)}. 3810 * 3811 * This method should be called only for view which were detached from their parent. 3812 * 3813 * @param child the child to attach 3814 * @param index the index at which the child should be attached 3815 * @param params the layout parameters of the child 3816 * 3817 * @see #removeDetachedView(View, boolean) 3818 * @see #detachAllViewsFromParent() 3819 * @see #detachViewFromParent(View) 3820 * @see #detachViewFromParent(int) 3821 */ 3822 protected void attachViewToParent(View child, int index, LayoutParams params) { 3823 child.mLayoutParams = params; 3824 3825 if (index < 0) { 3826 index = mChildrenCount; 3827 } 3828 3829 addInArray(child, index); 3830 3831 child.mParent = this; 3832 child.mPrivateFlags = (child.mPrivateFlags & ~DIRTY_MASK & ~DRAWING_CACHE_VALID) | 3833 DRAWN | INVALIDATED; 3834 this.mPrivateFlags |= INVALIDATED; 3835 3836 if (child.hasFocus()) { 3837 requestChildFocus(child, child.findFocus()); 3838 } 3839 } 3840 3841 /** 3842 * Detaches a view from its parent. Detaching a view should be temporary and followed 3843 * either by a call to {@link #attachViewToParent(View, int, android.view.ViewGroup.LayoutParams)} 3844 * or a call to {@link #removeDetachedView(View, boolean)}. When a view is detached, 3845 * its parent is null and cannot be retrieved by a call to {@link #getChildAt(int)}. 3846 * 3847 * @param child the child to detach 3848 * 3849 * @see #detachViewFromParent(int) 3850 * @see #detachViewsFromParent(int, int) 3851 * @see #detachAllViewsFromParent() 3852 * @see #attachViewToParent(View, int, android.view.ViewGroup.LayoutParams) 3853 * @see #removeDetachedView(View, boolean) 3854 */ 3855 protected void detachViewFromParent(View child) { 3856 removeFromArray(indexOfChild(child)); 3857 } 3858 3859 /** 3860 * Detaches a view from its parent. Detaching a view should be temporary and followed 3861 * either by a call to {@link #attachViewToParent(View, int, android.view.ViewGroup.LayoutParams)} 3862 * or a call to {@link #removeDetachedView(View, boolean)}. When a view is detached, 3863 * its parent is null and cannot be retrieved by a call to {@link #getChildAt(int)}. 3864 * 3865 * @param index the index of the child to detach 3866 * 3867 * @see #detachViewFromParent(View) 3868 * @see #detachAllViewsFromParent() 3869 * @see #detachViewsFromParent(int, int) 3870 * @see #attachViewToParent(View, int, android.view.ViewGroup.LayoutParams) 3871 * @see #removeDetachedView(View, boolean) 3872 */ 3873 protected void detachViewFromParent(int index) { 3874 removeFromArray(index); 3875 } 3876 3877 /** 3878 * Detaches a range of view from their parent. Detaching a view should be temporary and followed 3879 * either by a call to {@link #attachViewToParent(View, int, android.view.ViewGroup.LayoutParams)} 3880 * or a call to {@link #removeDetachedView(View, boolean)}. When a view is detached, its 3881 * parent is null and cannot be retrieved by a call to {@link #getChildAt(int)}. 3882 * 3883 * @param start the first index of the childrend range to detach 3884 * @param count the number of children to detach 3885 * 3886 * @see #detachViewFromParent(View) 3887 * @see #detachViewFromParent(int) 3888 * @see #detachAllViewsFromParent() 3889 * @see #attachViewToParent(View, int, android.view.ViewGroup.LayoutParams) 3890 * @see #removeDetachedView(View, boolean) 3891 */ 3892 protected void detachViewsFromParent(int start, int count) { 3893 removeFromArray(start, count); 3894 } 3895 3896 /** 3897 * Detaches all views from the parent. Detaching a view should be temporary and followed 3898 * either by a call to {@link #attachViewToParent(View, int, android.view.ViewGroup.LayoutParams)} 3899 * or a call to {@link #removeDetachedView(View, boolean)}. When a view is detached, 3900 * its parent is null and cannot be retrieved by a call to {@link #getChildAt(int)}. 3901 * 3902 * @see #detachViewFromParent(View) 3903 * @see #detachViewFromParent(int) 3904 * @see #detachViewsFromParent(int, int) 3905 * @see #attachViewToParent(View, int, android.view.ViewGroup.LayoutParams) 3906 * @see #removeDetachedView(View, boolean) 3907 */ 3908 protected void detachAllViewsFromParent() { 3909 final int count = mChildrenCount; 3910 if (count <= 0) { 3911 return; 3912 } 3913 3914 final View[] children = mChildren; 3915 mChildrenCount = 0; 3916 3917 for (int i = count - 1; i >= 0; i--) { 3918 children[i].mParent = null; 3919 children[i] = null; 3920 } 3921 } 3922 3923 /** 3924 * Don't call or override this method. It is used for the implementation of 3925 * the view hierarchy. 3926 */ 3927 public final void invalidateChild(View child, final Rect dirty) { 3928 if (ViewDebug.TRACE_HIERARCHY) { 3929 ViewDebug.trace(this, ViewDebug.HierarchyTraceType.INVALIDATE_CHILD); 3930 } 3931 3932 ViewParent parent = this; 3933 3934 final AttachInfo attachInfo = mAttachInfo; 3935 if (attachInfo != null) { 3936 // If the child is drawing an animation, we want to copy this flag onto 3937 // ourselves and the parent to make sure the invalidate request goes 3938 // through 3939 final boolean drawAnimation = (child.mPrivateFlags & DRAW_ANIMATION) == DRAW_ANIMATION; 3940 3941 //noinspection PointlessBooleanExpression 3942 if (!HardwareRenderer.RENDER_DIRTY_REGIONS) { 3943 if (dirty == null) { 3944 if (child.mLayerType != LAYER_TYPE_NONE) { 3945 mPrivateFlags |= INVALIDATED; 3946 mPrivateFlags &= ~DRAWING_CACHE_VALID; 3947 child.mLocalDirtyRect.setEmpty(); 3948 } 3949 do { 3950 View view = null; 3951 if (parent instanceof View) { 3952 view = (View) parent; 3953 if (view.mLayerType != LAYER_TYPE_NONE) { 3954 view.mLocalDirtyRect.setEmpty(); 3955 if (view.getParent() instanceof View) { 3956 final View grandParent = (View) view.getParent(); 3957 grandParent.mPrivateFlags |= INVALIDATED; 3958 grandParent.mPrivateFlags &= ~DRAWING_CACHE_VALID; 3959 } 3960 } 3961 if ((view.mPrivateFlags & DIRTY_MASK) != 0) { 3962 // already marked dirty - we're done 3963 break; 3964 } 3965 } 3966 3967 if (drawAnimation) { 3968 if (view != null) { 3969 view.mPrivateFlags |= DRAW_ANIMATION; 3970 } else if (parent instanceof ViewRootImpl) { 3971 ((ViewRootImpl) parent).mIsAnimating = true; 3972 } 3973 } 3974 3975 if (parent instanceof ViewRootImpl) { 3976 ((ViewRootImpl) parent).invalidate(); 3977 parent = null; 3978 } else if (view != null) { 3979 if ((view.mPrivateFlags & DRAWN) == DRAWN || 3980 (view.mPrivateFlags & DRAWING_CACHE_VALID) == DRAWING_CACHE_VALID) { 3981 view.mPrivateFlags &= ~DRAWING_CACHE_VALID; 3982 view.mPrivateFlags |= DIRTY; 3983 parent = view.mParent; 3984 } else { 3985 parent = null; 3986 } 3987 } 3988 } while (parent != null); 3989 } 3990 3991 return; 3992 } 3993 3994 // Check whether the child that requests the invalidate is fully opaque 3995 // Views being animated or transformed are not considered opaque because we may 3996 // be invalidating their old position and need the parent to paint behind them. 3997 Matrix childMatrix = child.getMatrix(); 3998 final boolean isOpaque = child.isOpaque() && !drawAnimation && 3999 child.getAnimation() == null && childMatrix.isIdentity(); 4000 // Mark the child as dirty, using the appropriate flag 4001 // Make sure we do not set both flags at the same time 4002 int opaqueFlag = isOpaque ? DIRTY_OPAQUE : DIRTY; 4003 4004 if (child.mLayerType != LAYER_TYPE_NONE) { 4005 mPrivateFlags |= INVALIDATED; 4006 mPrivateFlags &= ~DRAWING_CACHE_VALID; 4007 child.mLocalDirtyRect.union(dirty); 4008 } 4009 4010 final int[] location = attachInfo.mInvalidateChildLocation; 4011 location[CHILD_LEFT_INDEX] = child.mLeft; 4012 location[CHILD_TOP_INDEX] = child.mTop; 4013 if (!childMatrix.isIdentity()) { 4014 RectF boundingRect = attachInfo.mTmpTransformRect; 4015 boundingRect.set(dirty); 4016 //boundingRect.inset(-0.5f, -0.5f); 4017 childMatrix.mapRect(boundingRect); 4018 dirty.set((int) (boundingRect.left - 0.5f), 4019 (int) (boundingRect.top - 0.5f), 4020 (int) (boundingRect.right + 0.5f), 4021 (int) (boundingRect.bottom + 0.5f)); 4022 } 4023 4024 do { 4025 View view = null; 4026 if (parent instanceof View) { 4027 view = (View) parent; 4028 if (view.mLayerType != LAYER_TYPE_NONE && 4029 view.getParent() instanceof View) { 4030 final View grandParent = (View) view.getParent(); 4031 grandParent.mPrivateFlags |= INVALIDATED; 4032 grandParent.mPrivateFlags &= ~DRAWING_CACHE_VALID; 4033 } 4034 } 4035 4036 if (drawAnimation) { 4037 if (view != null) { 4038 view.mPrivateFlags |= DRAW_ANIMATION; 4039 } else if (parent instanceof ViewRootImpl) { 4040 ((ViewRootImpl) parent).mIsAnimating = true; 4041 } 4042 } 4043 4044 // If the parent is dirty opaque or not dirty, mark it dirty with the opaque 4045 // flag coming from the child that initiated the invalidate 4046 if (view != null) { 4047 if ((view.mViewFlags & FADING_EDGE_MASK) != 0 && 4048 view.getSolidColor() == 0) { 4049 opaqueFlag = DIRTY; 4050 } 4051 if ((view.mPrivateFlags & DIRTY_MASK) != DIRTY) { 4052 view.mPrivateFlags = (view.mPrivateFlags & ~DIRTY_MASK) | opaqueFlag; 4053 } 4054 } 4055 4056 parent = parent.invalidateChildInParent(location, dirty); 4057 if (view != null) { 4058 // Account for transform on current parent 4059 Matrix m = view.getMatrix(); 4060 if (!m.isIdentity()) { 4061 RectF boundingRect = attachInfo.mTmpTransformRect; 4062 boundingRect.set(dirty); 4063 m.mapRect(boundingRect); 4064 dirty.set((int) (boundingRect.left - 0.5f), 4065 (int) (boundingRect.top - 0.5f), 4066 (int) (boundingRect.right + 0.5f), 4067 (int) (boundingRect.bottom + 0.5f)); 4068 } 4069 } 4070 } while (parent != null); 4071 } 4072 } 4073 4074 /** 4075 * Don't call or override this method. It is used for the implementation of 4076 * the view hierarchy. 4077 * 4078 * This implementation returns null if this ViewGroup does not have a parent, 4079 * if this ViewGroup is already fully invalidated or if the dirty rectangle 4080 * does not intersect with this ViewGroup's bounds. 4081 */ 4082 public ViewParent invalidateChildInParent(final int[] location, final Rect dirty) { 4083 if (ViewDebug.TRACE_HIERARCHY) { 4084 ViewDebug.trace(this, ViewDebug.HierarchyTraceType.INVALIDATE_CHILD_IN_PARENT); 4085 } 4086 4087 if ((mPrivateFlags & DRAWN) == DRAWN || 4088 (mPrivateFlags & DRAWING_CACHE_VALID) == DRAWING_CACHE_VALID) { 4089 if ((mGroupFlags & (FLAG_OPTIMIZE_INVALIDATE | FLAG_ANIMATION_DONE)) != 4090 FLAG_OPTIMIZE_INVALIDATE) { 4091 dirty.offset(location[CHILD_LEFT_INDEX] - mScrollX, 4092 location[CHILD_TOP_INDEX] - mScrollY); 4093 4094 final int left = mLeft; 4095 final int top = mTop; 4096 4097 if ((mGroupFlags & FLAG_CLIP_CHILDREN) != FLAG_CLIP_CHILDREN || 4098 dirty.intersect(0, 0, mRight - left, mBottom - top) || 4099 (mPrivateFlags & DRAW_ANIMATION) == DRAW_ANIMATION) { 4100 mPrivateFlags &= ~DRAWING_CACHE_VALID; 4101 4102 location[CHILD_LEFT_INDEX] = left; 4103 location[CHILD_TOP_INDEX] = top; 4104 4105 if (mLayerType != LAYER_TYPE_NONE) { 4106 mLocalDirtyRect.union(dirty); 4107 } 4108 4109 return mParent; 4110 } 4111 } else { 4112 mPrivateFlags &= ~DRAWN & ~DRAWING_CACHE_VALID; 4113 4114 location[CHILD_LEFT_INDEX] = mLeft; 4115 location[CHILD_TOP_INDEX] = mTop; 4116 if ((mGroupFlags & FLAG_CLIP_CHILDREN) == FLAG_CLIP_CHILDREN) { 4117 dirty.set(0, 0, mRight - mLeft, mBottom - mTop); 4118 } else { 4119 // in case the dirty rect extends outside the bounds of this container 4120 dirty.union(0, 0, mRight - mLeft, mBottom - mTop); 4121 } 4122 4123 if (mLayerType != LAYER_TYPE_NONE) { 4124 mLocalDirtyRect.union(dirty); 4125 } 4126 4127 return mParent; 4128 } 4129 } 4130 4131 return null; 4132 } 4133 4134 /** 4135 * Quick invalidation method called by View.invalidateViewProperty. This doesn't set the 4136 * DRAWN flags and doesn't handle the Animation logic that the default invalidation methods 4137 * do; all we want to do here is schedule a traversal with the appropriate dirty rect. 4138 * 4139 * @hide 4140 */ 4141 public void invalidateChildFast(View child, final Rect dirty) { 4142 ViewParent parent = this; 4143 4144 final AttachInfo attachInfo = mAttachInfo; 4145 if (attachInfo != null) { 4146 if (child.mLayerType != LAYER_TYPE_NONE) { 4147 child.mLocalDirtyRect.union(dirty); 4148 } 4149 4150 int left = child.mLeft; 4151 int top = child.mTop; 4152 if (!child.getMatrix().isIdentity()) { 4153 child.transformRect(dirty); 4154 } 4155 4156 do { 4157 if (parent instanceof ViewGroup) { 4158 ViewGroup parentVG = (ViewGroup) parent; 4159 if (parentVG.mLayerType != LAYER_TYPE_NONE) { 4160 // Layered parents should be recreated, not just re-issued 4161 parentVG.invalidate(); 4162 parent = null; 4163 } else { 4164 parent = parentVG.invalidateChildInParentFast(left, top, dirty); 4165 left = parentVG.mLeft; 4166 top = parentVG.mTop; 4167 } 4168 } else { 4169 // Reached the top; this calls into the usual invalidate method in 4170 // ViewRootImpl, which schedules a traversal 4171 final int[] location = attachInfo.mInvalidateChildLocation; 4172 location[0] = left; 4173 location[1] = top; 4174 parent = parent.invalidateChildInParent(location, dirty); 4175 } 4176 } while (parent != null); 4177 } 4178 } 4179 4180 /** 4181 * Quick invalidation method that simply transforms the dirty rect into the parent's 4182 * coordinate system, pruning the invalidation if the parent has already been invalidated. 4183 */ 4184 private ViewParent invalidateChildInParentFast(int left, int top, final Rect dirty) { 4185 if ((mPrivateFlags & DRAWN) == DRAWN || 4186 (mPrivateFlags & DRAWING_CACHE_VALID) == DRAWING_CACHE_VALID) { 4187 dirty.offset(left - mScrollX, top - mScrollY); 4188 4189 if ((mGroupFlags & FLAG_CLIP_CHILDREN) == 0 || 4190 dirty.intersect(0, 0, mRight - mLeft, mBottom - mTop)) { 4191 4192 if (mLayerType != LAYER_TYPE_NONE) { 4193 mLocalDirtyRect.union(dirty); 4194 } 4195 if (!getMatrix().isIdentity()) { 4196 transformRect(dirty); 4197 } 4198 4199 return mParent; 4200 } 4201 } 4202 4203 return null; 4204 } 4205 4206 /** 4207 * Offset a rectangle that is in a descendant's coordinate 4208 * space into our coordinate space. 4209 * @param descendant A descendant of this view 4210 * @param rect A rectangle defined in descendant's coordinate space. 4211 */ 4212 public final void offsetDescendantRectToMyCoords(View descendant, Rect rect) { 4213 offsetRectBetweenParentAndChild(descendant, rect, true, false); 4214 } 4215 4216 /** 4217 * Offset a rectangle that is in our coordinate space into an ancestor's 4218 * coordinate space. 4219 * @param descendant A descendant of this view 4220 * @param rect A rectangle defined in descendant's coordinate space. 4221 */ 4222 public final void offsetRectIntoDescendantCoords(View descendant, Rect rect) { 4223 offsetRectBetweenParentAndChild(descendant, rect, false, false); 4224 } 4225 4226 /** 4227 * Helper method that offsets a rect either from parent to descendant or 4228 * descendant to parent. 4229 */ 4230 void offsetRectBetweenParentAndChild(View descendant, Rect rect, 4231 boolean offsetFromChildToParent, boolean clipToBounds) { 4232 4233 // already in the same coord system :) 4234 if (descendant == this) { 4235 return; 4236 } 4237 4238 ViewParent theParent = descendant.mParent; 4239 4240 // search and offset up to the parent 4241 while ((theParent != null) 4242 && (theParent instanceof View) 4243 && (theParent != this)) { 4244 4245 if (offsetFromChildToParent) { 4246 rect.offset(descendant.mLeft - descendant.mScrollX, 4247 descendant.mTop - descendant.mScrollY); 4248 if (clipToBounds) { 4249 View p = (View) theParent; 4250 rect.intersect(0, 0, p.mRight - p.mLeft, p.mBottom - p.mTop); 4251 } 4252 } else { 4253 if (clipToBounds) { 4254 View p = (View) theParent; 4255 rect.intersect(0, 0, p.mRight - p.mLeft, p.mBottom - p.mTop); 4256 } 4257 rect.offset(descendant.mScrollX - descendant.mLeft, 4258 descendant.mScrollY - descendant.mTop); 4259 } 4260 4261 descendant = (View) theParent; 4262 theParent = descendant.mParent; 4263 } 4264 4265 // now that we are up to this view, need to offset one more time 4266 // to get into our coordinate space 4267 if (theParent == this) { 4268 if (offsetFromChildToParent) { 4269 rect.offset(descendant.mLeft - descendant.mScrollX, 4270 descendant.mTop - descendant.mScrollY); 4271 } else { 4272 rect.offset(descendant.mScrollX - descendant.mLeft, 4273 descendant.mScrollY - descendant.mTop); 4274 } 4275 } else { 4276 throw new IllegalArgumentException("parameter must be a descendant of this view"); 4277 } 4278 } 4279 4280 /** 4281 * Offset the vertical location of all children of this view by the specified number of pixels. 4282 * 4283 * @param offset the number of pixels to offset 4284 * 4285 * @hide 4286 */ 4287 public void offsetChildrenTopAndBottom(int offset) { 4288 final int count = mChildrenCount; 4289 final View[] children = mChildren; 4290 4291 for (int i = 0; i < count; i++) { 4292 final View v = children[i]; 4293 v.mTop += offset; 4294 v.mBottom += offset; 4295 if (v.mDisplayList != null) { 4296 v.mDisplayList.offsetTopBottom(offset); 4297 invalidateViewProperty(false, false); 4298 } 4299 } 4300 } 4301 4302 /** 4303 * {@inheritDoc} 4304 */ 4305 public boolean getChildVisibleRect(View child, Rect r, android.graphics.Point offset) { 4306 // It doesn't make a whole lot of sense to call this on a view that isn't attached, 4307 // but for some simple tests it can be useful. If we don't have attach info this 4308 // will allocate memory. 4309 final RectF rect = mAttachInfo != null ? mAttachInfo.mTmpTransformRect : new RectF(); 4310 rect.set(r); 4311 4312 if (!child.hasIdentityMatrix()) { 4313 child.getMatrix().mapRect(rect); 4314 } 4315 4316 int dx = child.mLeft - mScrollX; 4317 int dy = child.mTop - mScrollY; 4318 4319 rect.offset(dx, dy); 4320 4321 if (offset != null) { 4322 if (!child.hasIdentityMatrix()) { 4323 float[] position = mAttachInfo != null ? mAttachInfo.mTmpTransformLocation 4324 : new float[2]; 4325 position[0] = offset.x; 4326 position[1] = offset.y; 4327 child.getMatrix().mapPoints(position); 4328 offset.x = (int) (position[0] + 0.5f); 4329 offset.y = (int) (position[1] + 0.5f); 4330 } 4331 offset.x += dx; 4332 offset.y += dy; 4333 } 4334 4335 if (rect.intersect(0, 0, mRight - mLeft, mBottom - mTop)) { 4336 if (mParent == null) return true; 4337 r.set((int) (rect.left + 0.5f), (int) (rect.top + 0.5f), 4338 (int) (rect.right + 0.5f), (int) (rect.bottom + 0.5f)); 4339 return mParent.getChildVisibleRect(this, r, offset); 4340 } 4341 4342 return false; 4343 } 4344 4345 /** 4346 * {@inheritDoc} 4347 */ 4348 @Override 4349 public final void layout(int l, int t, int r, int b) { 4350 if (mTransition == null || !mTransition.isChangingLayout()) { 4351 if (mTransition != null) { 4352 mTransition.layoutChange(this); 4353 } 4354 super.layout(l, t, r, b); 4355 } else { 4356 // record the fact that we noop'd it; request layout when transition finishes 4357 mLayoutSuppressed = true; 4358 } 4359 } 4360 4361 /** 4362 * {@inheritDoc} 4363 */ 4364 @Override 4365 protected abstract void onLayout(boolean changed, 4366 int l, int t, int r, int b); 4367 4368 /** 4369 * Indicates whether the view group has the ability to animate its children 4370 * after the first layout. 4371 * 4372 * @return true if the children can be animated, false otherwise 4373 */ 4374 protected boolean canAnimate() { 4375 return mLayoutAnimationController != null; 4376 } 4377 4378 /** 4379 * Runs the layout animation. Calling this method triggers a relayout of 4380 * this view group. 4381 */ 4382 public void startLayoutAnimation() { 4383 if (mLayoutAnimationController != null) { 4384 mGroupFlags |= FLAG_RUN_ANIMATION; 4385 requestLayout(); 4386 } 4387 } 4388 4389 /** 4390 * Schedules the layout animation to be played after the next layout pass 4391 * of this view group. This can be used to restart the layout animation 4392 * when the content of the view group changes or when the activity is 4393 * paused and resumed. 4394 */ 4395 public void scheduleLayoutAnimation() { 4396 mGroupFlags |= FLAG_RUN_ANIMATION; 4397 } 4398 4399 /** 4400 * Sets the layout animation controller used to animate the group's 4401 * children after the first layout. 4402 * 4403 * @param controller the animation controller 4404 */ 4405 public void setLayoutAnimation(LayoutAnimationController controller) { 4406 mLayoutAnimationController = controller; 4407 if (mLayoutAnimationController != null) { 4408 mGroupFlags |= FLAG_RUN_ANIMATION; 4409 } 4410 } 4411 4412 /** 4413 * Returns the layout animation controller used to animate the group's 4414 * children. 4415 * 4416 * @return the current animation controller 4417 */ 4418 public LayoutAnimationController getLayoutAnimation() { 4419 return mLayoutAnimationController; 4420 } 4421 4422 /** 4423 * Indicates whether the children's drawing cache is used during a layout 4424 * animation. By default, the drawing cache is enabled but this will prevent 4425 * nested layout animations from working. To nest animations, you must disable 4426 * the cache. 4427 * 4428 * @return true if the animation cache is enabled, false otherwise 4429 * 4430 * @see #setAnimationCacheEnabled(boolean) 4431 * @see View#setDrawingCacheEnabled(boolean) 4432 */ 4433 @ViewDebug.ExportedProperty 4434 public boolean isAnimationCacheEnabled() { 4435 return (mGroupFlags & FLAG_ANIMATION_CACHE) == FLAG_ANIMATION_CACHE; 4436 } 4437 4438 /** 4439 * Enables or disables the children's drawing cache during a layout animation. 4440 * By default, the drawing cache is enabled but this will prevent nested 4441 * layout animations from working. To nest animations, you must disable the 4442 * cache. 4443 * 4444 * @param enabled true to enable the animation cache, false otherwise 4445 * 4446 * @see #isAnimationCacheEnabled() 4447 * @see View#setDrawingCacheEnabled(boolean) 4448 */ 4449 public void setAnimationCacheEnabled(boolean enabled) { 4450 setBooleanFlag(FLAG_ANIMATION_CACHE, enabled); 4451 } 4452 4453 /** 4454 * Indicates whether this ViewGroup will always try to draw its children using their 4455 * drawing cache. By default this property is enabled. 4456 * 4457 * @return true if the animation cache is enabled, false otherwise 4458 * 4459 * @see #setAlwaysDrawnWithCacheEnabled(boolean) 4460 * @see #setChildrenDrawnWithCacheEnabled(boolean) 4461 * @see View#setDrawingCacheEnabled(boolean) 4462 */ 4463 @ViewDebug.ExportedProperty(category = "drawing") 4464 public boolean isAlwaysDrawnWithCacheEnabled() { 4465 return (mGroupFlags & FLAG_ALWAYS_DRAWN_WITH_CACHE) == FLAG_ALWAYS_DRAWN_WITH_CACHE; 4466 } 4467 4468 /** 4469 * Indicates whether this ViewGroup will always try to draw its children using their 4470 * drawing cache. This property can be set to true when the cache rendering is 4471 * slightly different from the children's normal rendering. Renderings can be different, 4472 * for instance, when the cache's quality is set to low. 4473 * 4474 * When this property is disabled, the ViewGroup will use the drawing cache of its 4475 * children only when asked to. It's usually the task of subclasses to tell ViewGroup 4476 * when to start using the drawing cache and when to stop using it. 4477 * 4478 * @param always true to always draw with the drawing cache, false otherwise 4479 * 4480 * @see #isAlwaysDrawnWithCacheEnabled() 4481 * @see #setChildrenDrawnWithCacheEnabled(boolean) 4482 * @see View#setDrawingCacheEnabled(boolean) 4483 * @see View#setDrawingCacheQuality(int) 4484 */ 4485 public void setAlwaysDrawnWithCacheEnabled(boolean always) { 4486 setBooleanFlag(FLAG_ALWAYS_DRAWN_WITH_CACHE, always); 4487 } 4488 4489 /** 4490 * Indicates whether the ViewGroup is currently drawing its children using 4491 * their drawing cache. 4492 * 4493 * @return true if children should be drawn with their cache, false otherwise 4494 * 4495 * @see #setAlwaysDrawnWithCacheEnabled(boolean) 4496 * @see #setChildrenDrawnWithCacheEnabled(boolean) 4497 */ 4498 @ViewDebug.ExportedProperty(category = "drawing") 4499 protected boolean isChildrenDrawnWithCacheEnabled() { 4500 return (mGroupFlags & FLAG_CHILDREN_DRAWN_WITH_CACHE) == FLAG_CHILDREN_DRAWN_WITH_CACHE; 4501 } 4502 4503 /** 4504 * Tells the ViewGroup to draw its children using their drawing cache. This property 4505 * is ignored when {@link #isAlwaysDrawnWithCacheEnabled()} is true. A child's drawing cache 4506 * will be used only if it has been enabled. 4507 * 4508 * Subclasses should call this method to start and stop using the drawing cache when 4509 * they perform performance sensitive operations, like scrolling or animating. 4510 * 4511 * @param enabled true if children should be drawn with their cache, false otherwise 4512 * 4513 * @see #setAlwaysDrawnWithCacheEnabled(boolean) 4514 * @see #isChildrenDrawnWithCacheEnabled() 4515 */ 4516 protected void setChildrenDrawnWithCacheEnabled(boolean enabled) { 4517 setBooleanFlag(FLAG_CHILDREN_DRAWN_WITH_CACHE, enabled); 4518 } 4519 4520 /** 4521 * Indicates whether the ViewGroup is drawing its children in the order defined by 4522 * {@link #getChildDrawingOrder(int, int)}. 4523 * 4524 * @return true if children drawing order is defined by {@link #getChildDrawingOrder(int, int)}, 4525 * false otherwise 4526 * 4527 * @see #setChildrenDrawingOrderEnabled(boolean) 4528 * @see #getChildDrawingOrder(int, int) 4529 */ 4530 @ViewDebug.ExportedProperty(category = "drawing") 4531 protected boolean isChildrenDrawingOrderEnabled() { 4532 return (mGroupFlags & FLAG_USE_CHILD_DRAWING_ORDER) == FLAG_USE_CHILD_DRAWING_ORDER; 4533 } 4534 4535 /** 4536 * Tells the ViewGroup whether to draw its children in the order defined by the method 4537 * {@link #getChildDrawingOrder(int, int)}. 4538 * 4539 * @param enabled true if the order of the children when drawing is determined by 4540 * {@link #getChildDrawingOrder(int, int)}, false otherwise 4541 * 4542 * @see #isChildrenDrawingOrderEnabled() 4543 * @see #getChildDrawingOrder(int, int) 4544 */ 4545 protected void setChildrenDrawingOrderEnabled(boolean enabled) { 4546 setBooleanFlag(FLAG_USE_CHILD_DRAWING_ORDER, enabled); 4547 } 4548 4549 private void setBooleanFlag(int flag, boolean value) { 4550 if (value) { 4551 mGroupFlags |= flag; 4552 } else { 4553 mGroupFlags &= ~flag; 4554 } 4555 } 4556 4557 /** 4558 * Returns an integer indicating what types of drawing caches are kept in memory. 4559 * 4560 * @see #setPersistentDrawingCache(int) 4561 * @see #setAnimationCacheEnabled(boolean) 4562 * 4563 * @return one or a combination of {@link #PERSISTENT_NO_CACHE}, 4564 * {@link #PERSISTENT_ANIMATION_CACHE}, {@link #PERSISTENT_SCROLLING_CACHE} 4565 * and {@link #PERSISTENT_ALL_CACHES} 4566 */ 4567 @ViewDebug.ExportedProperty(category = "drawing", mapping = { 4568 @ViewDebug.IntToString(from = PERSISTENT_NO_CACHE, to = "NONE"), 4569 @ViewDebug.IntToString(from = PERSISTENT_ANIMATION_CACHE, to = "ANIMATION"), 4570 @ViewDebug.IntToString(from = PERSISTENT_SCROLLING_CACHE, to = "SCROLLING"), 4571 @ViewDebug.IntToString(from = PERSISTENT_ALL_CACHES, to = "ALL") 4572 }) 4573 public int getPersistentDrawingCache() { 4574 return mPersistentDrawingCache; 4575 } 4576 4577 /** 4578 * Indicates what types of drawing caches should be kept in memory after 4579 * they have been created. 4580 * 4581 * @see #getPersistentDrawingCache() 4582 * @see #setAnimationCacheEnabled(boolean) 4583 * 4584 * @param drawingCacheToKeep one or a combination of {@link #PERSISTENT_NO_CACHE}, 4585 * {@link #PERSISTENT_ANIMATION_CACHE}, {@link #PERSISTENT_SCROLLING_CACHE} 4586 * and {@link #PERSISTENT_ALL_CACHES} 4587 */ 4588 public void setPersistentDrawingCache(int drawingCacheToKeep) { 4589 mPersistentDrawingCache = drawingCacheToKeep & PERSISTENT_ALL_CACHES; 4590 } 4591 4592 /** 4593 * Returns the basis of alignment during the layout of this view group: 4594 * either {@link #COMPONENT_BOUNDS} or {@link #LAYOUT_BOUNDS}. 4595 * 4596 * @return the layout mode to use during layout operations 4597 * 4598 * @see #setLayoutMode(int) 4599 */ 4600 public int getLayoutMode() { 4601 if (mLayoutMode == UNDEFINED_LAYOUT_MODE) { 4602 ViewParent parent = getParent(); 4603 if (parent instanceof ViewGroup) { 4604 ViewGroup viewGroup = (ViewGroup) parent; 4605 return viewGroup.getLayoutMode(); 4606 } else { 4607 int targetSdkVersion = mContext.getApplicationInfo().targetSdkVersion; 4608 boolean preJellyBean = targetSdkVersion < Build.VERSION_CODES.JELLY_BEAN; 4609 return preJellyBean ? COMPONENT_BOUNDS : LAYOUT_BOUNDS; 4610 } 4611 4612 } 4613 return mLayoutMode; 4614 } 4615 4616 /** 4617 * Sets the basis of alignment during alignment of this view group. 4618 * Valid values are either {@link #COMPONENT_BOUNDS} or {@link #LAYOUT_BOUNDS}. 4619 * <p> 4620 * The default is to query the property of the parent if this view group has a parent. 4621 * If this ViewGroup is the root of the view hierarchy the default 4622 * value is {@link #LAYOUT_BOUNDS} for target SDK's greater than JellyBean, 4623 * {@link #LAYOUT_BOUNDS} otherwise. 4624 * 4625 * @param layoutMode the layout mode to use during layout operations 4626 * 4627 * @see #getLayoutMode() 4628 */ 4629 public void setLayoutMode(int layoutMode) { 4630 if (mLayoutMode != layoutMode) { 4631 mLayoutMode = layoutMode; 4632 requestLayout(); 4633 } 4634 } 4635 4636 /** 4637 * Returns a new set of layout parameters based on the supplied attributes set. 4638 * 4639 * @param attrs the attributes to build the layout parameters from 4640 * 4641 * @return an instance of {@link android.view.ViewGroup.LayoutParams} or one 4642 * of its descendants 4643 */ 4644 public LayoutParams generateLayoutParams(AttributeSet attrs) { 4645 return new LayoutParams(getContext(), attrs); 4646 } 4647 4648 /** 4649 * Returns a safe set of layout parameters based on the supplied layout params. 4650 * When a ViewGroup is passed a View whose layout params do not pass the test of 4651 * {@link #checkLayoutParams(android.view.ViewGroup.LayoutParams)}, this method 4652 * is invoked. This method should return a new set of layout params suitable for 4653 * this ViewGroup, possibly by copying the appropriate attributes from the 4654 * specified set of layout params. 4655 * 4656 * @param p The layout parameters to convert into a suitable set of layout parameters 4657 * for this ViewGroup. 4658 * 4659 * @return an instance of {@link android.view.ViewGroup.LayoutParams} or one 4660 * of its descendants 4661 */ 4662 protected LayoutParams generateLayoutParams(ViewGroup.LayoutParams p) { 4663 return p; 4664 } 4665 4666 /** 4667 * Returns a set of default layout parameters. These parameters are requested 4668 * when the View passed to {@link #addView(View)} has no layout parameters 4669 * already set. If null is returned, an exception is thrown from addView. 4670 * 4671 * @return a set of default layout parameters or null 4672 */ 4673 protected LayoutParams generateDefaultLayoutParams() { 4674 return new LayoutParams(LayoutParams.WRAP_CONTENT, LayoutParams.WRAP_CONTENT); 4675 } 4676 4677 /** 4678 * @hide 4679 */ 4680 @Override 4681 protected boolean dispatchConsistencyCheck(int consistency) { 4682 boolean result = super.dispatchConsistencyCheck(consistency); 4683 4684 final int count = mChildrenCount; 4685 final View[] children = mChildren; 4686 for (int i = 0; i < count; i++) { 4687 if (!children[i].dispatchConsistencyCheck(consistency)) result = false; 4688 } 4689 4690 return result; 4691 } 4692 4693 /** 4694 * @hide 4695 */ 4696 @Override 4697 protected boolean onConsistencyCheck(int consistency) { 4698 boolean result = super.onConsistencyCheck(consistency); 4699 4700 final boolean checkLayout = (consistency & ViewDebug.CONSISTENCY_LAYOUT) != 0; 4701 final boolean checkDrawing = (consistency & ViewDebug.CONSISTENCY_DRAWING) != 0; 4702 4703 if (checkLayout) { 4704 final int count = mChildrenCount; 4705 final View[] children = mChildren; 4706 for (int i = 0; i < count; i++) { 4707 if (children[i].getParent() != this) { 4708 result = false; 4709 android.util.Log.d(ViewDebug.CONSISTENCY_LOG_TAG, 4710 "View " + children[i] + " has no parent/a parent that is not " + this); 4711 } 4712 } 4713 } 4714 4715 if (checkDrawing) { 4716 // If this group is dirty, check that the parent is dirty as well 4717 if ((mPrivateFlags & DIRTY_MASK) != 0) { 4718 final ViewParent parent = getParent(); 4719 if (parent != null && !(parent instanceof ViewRootImpl)) { 4720 if ((((View) parent).mPrivateFlags & DIRTY_MASK) == 0) { 4721 result = false; 4722 android.util.Log.d(ViewDebug.CONSISTENCY_LOG_TAG, 4723 "ViewGroup " + this + " is dirty but its parent is not: " + this); 4724 } 4725 } 4726 } 4727 } 4728 4729 return result; 4730 } 4731 4732 /** 4733 * {@inheritDoc} 4734 */ 4735 @Override 4736 protected void debug(int depth) { 4737 super.debug(depth); 4738 String output; 4739 4740 if (mFocused != null) { 4741 output = debugIndent(depth); 4742 output += "mFocused"; 4743 Log.d(VIEW_LOG_TAG, output); 4744 } 4745 if (mChildrenCount != 0) { 4746 output = debugIndent(depth); 4747 output += "{"; 4748 Log.d(VIEW_LOG_TAG, output); 4749 } 4750 int count = mChildrenCount; 4751 for (int i = 0; i < count; i++) { 4752 View child = mChildren[i]; 4753 child.debug(depth + 1); 4754 } 4755 4756 if (mChildrenCount != 0) { 4757 output = debugIndent(depth); 4758 output += "}"; 4759 Log.d(VIEW_LOG_TAG, output); 4760 } 4761 } 4762 4763 /** 4764 * Returns the position in the group of the specified child view. 4765 * 4766 * @param child the view for which to get the position 4767 * @return a positive integer representing the position of the view in the 4768 * group, or -1 if the view does not exist in the group 4769 */ 4770 public int indexOfChild(View child) { 4771 final int count = mChildrenCount; 4772 final View[] children = mChildren; 4773 for (int i = 0; i < count; i++) { 4774 if (children[i] == child) { 4775 return i; 4776 } 4777 } 4778 return -1; 4779 } 4780 4781 /** 4782 * Returns the number of children in the group. 4783 * 4784 * @return a positive integer representing the number of children in 4785 * the group 4786 */ 4787 public int getChildCount() { 4788 return mChildrenCount; 4789 } 4790 4791 /** 4792 * Returns the view at the specified position in the group. 4793 * 4794 * @param index the position at which to get the view from 4795 * @return the view at the specified position or null if the position 4796 * does not exist within the group 4797 */ 4798 public View getChildAt(int index) { 4799 if (index < 0 || index >= mChildrenCount) { 4800 return null; 4801 } 4802 return mChildren[index]; 4803 } 4804 4805 /** 4806 * Ask all of the children of this view to measure themselves, taking into 4807 * account both the MeasureSpec requirements for this view and its padding. 4808 * We skip children that are in the GONE state The heavy lifting is done in 4809 * getChildMeasureSpec. 4810 * 4811 * @param widthMeasureSpec The width requirements for this view 4812 * @param heightMeasureSpec The height requirements for this view 4813 */ 4814 protected void measureChildren(int widthMeasureSpec, int heightMeasureSpec) { 4815 final int size = mChildrenCount; 4816 final View[] children = mChildren; 4817 for (int i = 0; i < size; ++i) { 4818 final View child = children[i]; 4819 if ((child.mViewFlags & VISIBILITY_MASK) != GONE) { 4820 measureChild(child, widthMeasureSpec, heightMeasureSpec); 4821 } 4822 } 4823 } 4824 4825 /** 4826 * Ask one of the children of this view to measure itself, taking into 4827 * account both the MeasureSpec requirements for this view and its padding. 4828 * The heavy lifting is done in getChildMeasureSpec. 4829 * 4830 * @param child The child to measure 4831 * @param parentWidthMeasureSpec The width requirements for this view 4832 * @param parentHeightMeasureSpec The height requirements for this view 4833 */ 4834 protected void measureChild(View child, int parentWidthMeasureSpec, 4835 int parentHeightMeasureSpec) { 4836 final LayoutParams lp = child.getLayoutParams(); 4837 4838 final int childWidthMeasureSpec = getChildMeasureSpec(parentWidthMeasureSpec, 4839 mPaddingLeft + mPaddingRight, lp.width); 4840 final int childHeightMeasureSpec = getChildMeasureSpec(parentHeightMeasureSpec, 4841 mPaddingTop + mPaddingBottom, lp.height); 4842 4843 child.measure(childWidthMeasureSpec, childHeightMeasureSpec); 4844 } 4845 4846 /** 4847 * Ask one of the children of this view to measure itself, taking into 4848 * account both the MeasureSpec requirements for this view and its padding 4849 * and margins. The child must have MarginLayoutParams The heavy lifting is 4850 * done in getChildMeasureSpec. 4851 * 4852 * @param child The child to measure 4853 * @param parentWidthMeasureSpec The width requirements for this view 4854 * @param widthUsed Extra space that has been used up by the parent 4855 * horizontally (possibly by other children of the parent) 4856 * @param parentHeightMeasureSpec The height requirements for this view 4857 * @param heightUsed Extra space that has been used up by the parent 4858 * vertically (possibly by other children of the parent) 4859 */ 4860 protected void measureChildWithMargins(View child, 4861 int parentWidthMeasureSpec, int widthUsed, 4862 int parentHeightMeasureSpec, int heightUsed) { 4863 final MarginLayoutParams lp = (MarginLayoutParams) child.getLayoutParams(); 4864 4865 final int childWidthMeasureSpec = getChildMeasureSpec(parentWidthMeasureSpec, 4866 mPaddingLeft + mPaddingRight + lp.leftMargin + lp.rightMargin 4867 + widthUsed, lp.width); 4868 final int childHeightMeasureSpec = getChildMeasureSpec(parentHeightMeasureSpec, 4869 mPaddingTop + mPaddingBottom + lp.topMargin + lp.bottomMargin 4870 + heightUsed, lp.height); 4871 4872 child.measure(childWidthMeasureSpec, childHeightMeasureSpec); 4873 } 4874 4875 /** 4876 * Does the hard part of measureChildren: figuring out the MeasureSpec to 4877 * pass to a particular child. This method figures out the right MeasureSpec 4878 * for one dimension (height or width) of one child view. 4879 * 4880 * The goal is to combine information from our MeasureSpec with the 4881 * LayoutParams of the child to get the best possible results. For example, 4882 * if the this view knows its size (because its MeasureSpec has a mode of 4883 * EXACTLY), and the child has indicated in its LayoutParams that it wants 4884 * to be the same size as the parent, the parent should ask the child to 4885 * layout given an exact size. 4886 * 4887 * @param spec The requirements for this view 4888 * @param padding The padding of this view for the current dimension and 4889 * margins, if applicable 4890 * @param childDimension How big the child wants to be in the current 4891 * dimension 4892 * @return a MeasureSpec integer for the child 4893 */ 4894 public static int getChildMeasureSpec(int spec, int padding, int childDimension) { 4895 int specMode = MeasureSpec.getMode(spec); 4896 int specSize = MeasureSpec.getSize(spec); 4897 4898 int size = Math.max(0, specSize - padding); 4899 4900 int resultSize = 0; 4901 int resultMode = 0; 4902 4903 switch (specMode) { 4904 // Parent has imposed an exact size on us 4905 case MeasureSpec.EXACTLY: 4906 if (childDimension >= 0) { 4907 resultSize = childDimension; 4908 resultMode = MeasureSpec.EXACTLY; 4909 } else if (childDimension == LayoutParams.MATCH_PARENT) { 4910 // Child wants to be our size. So be it. 4911 resultSize = size; 4912 resultMode = MeasureSpec.EXACTLY; 4913 } else if (childDimension == LayoutParams.WRAP_CONTENT) { 4914 // Child wants to determine its own size. It can't be 4915 // bigger than us. 4916 resultSize = size; 4917 resultMode = MeasureSpec.AT_MOST; 4918 } 4919 break; 4920 4921 // Parent has imposed a maximum size on us 4922 case MeasureSpec.AT_MOST: 4923 if (childDimension >= 0) { 4924 // Child wants a specific size... so be it 4925 resultSize = childDimension; 4926 resultMode = MeasureSpec.EXACTLY; 4927 } else if (childDimension == LayoutParams.MATCH_PARENT) { 4928 // Child wants to be our size, but our size is not fixed. 4929 // Constrain child to not be bigger than us. 4930 resultSize = size; 4931 resultMode = MeasureSpec.AT_MOST; 4932 } else if (childDimension == LayoutParams.WRAP_CONTENT) { 4933 // Child wants to determine its own size. It can't be 4934 // bigger than us. 4935 resultSize = size; 4936 resultMode = MeasureSpec.AT_MOST; 4937 } 4938 break; 4939 4940 // Parent asked to see how big we want to be 4941 case MeasureSpec.UNSPECIFIED: 4942 if (childDimension >= 0) { 4943 // Child wants a specific size... let him have it 4944 resultSize = childDimension; 4945 resultMode = MeasureSpec.EXACTLY; 4946 } else if (childDimension == LayoutParams.MATCH_PARENT) { 4947 // Child wants to be our size... find out how big it should 4948 // be 4949 resultSize = 0; 4950 resultMode = MeasureSpec.UNSPECIFIED; 4951 } else if (childDimension == LayoutParams.WRAP_CONTENT) { 4952 // Child wants to determine its own size.... find out how 4953 // big it should be 4954 resultSize = 0; 4955 resultMode = MeasureSpec.UNSPECIFIED; 4956 } 4957 break; 4958 } 4959 return MeasureSpec.makeMeasureSpec(resultSize, resultMode); 4960 } 4961 4962 4963 /** 4964 * Removes any pending animations for views that have been removed. Call 4965 * this if you don't want animations for exiting views to stack up. 4966 */ 4967 public void clearDisappearingChildren() { 4968 if (mDisappearingChildren != null) { 4969 mDisappearingChildren.clear(); 4970 invalidate(); 4971 } 4972 } 4973 4974 /** 4975 * Add a view which is removed from mChildren but still needs animation 4976 * 4977 * @param v View to add 4978 */ 4979 private void addDisappearingView(View v) { 4980 ArrayList<View> disappearingChildren = mDisappearingChildren; 4981 4982 if (disappearingChildren == null) { 4983 disappearingChildren = mDisappearingChildren = new ArrayList<View>(); 4984 } 4985 4986 disappearingChildren.add(v); 4987 } 4988 4989 /** 4990 * Cleanup a view when its animation is done. This may mean removing it from 4991 * the list of disappearing views. 4992 * 4993 * @param view The view whose animation has finished 4994 * @param animation The animation, cannot be null 4995 */ 4996 void finishAnimatingView(final View view, Animation animation) { 4997 final ArrayList<View> disappearingChildren = mDisappearingChildren; 4998 if (disappearingChildren != null) { 4999 if (disappearingChildren.contains(view)) { 5000 disappearingChildren.remove(view); 5001 5002 if (view.mAttachInfo != null) { 5003 view.dispatchDetachedFromWindow(); 5004 } 5005 5006 view.clearAnimation(); 5007 mGroupFlags |= FLAG_INVALIDATE_REQUIRED; 5008 } 5009 } 5010 5011 if (animation != null && !animation.getFillAfter()) { 5012 view.clearAnimation(); 5013 } 5014 5015 if ((view.mPrivateFlags & ANIMATION_STARTED) == ANIMATION_STARTED) { 5016 view.onAnimationEnd(); 5017 // Should be performed by onAnimationEnd() but this avoid an infinite loop, 5018 // so we'd rather be safe than sorry 5019 view.mPrivateFlags &= ~ANIMATION_STARTED; 5020 // Draw one more frame after the animation is done 5021 mGroupFlags |= FLAG_INVALIDATE_REQUIRED; 5022 } 5023 } 5024 5025 /** 5026 * Utility function called by View during invalidation to determine whether a view that 5027 * is invisible or gone should still be invalidated because it is being transitioned (and 5028 * therefore still needs to be drawn). 5029 */ 5030 boolean isViewTransitioning(View view) { 5031 return (mTransitioningViews != null && mTransitioningViews.contains(view)); 5032 } 5033 5034 /** 5035 * This method tells the ViewGroup that the given View object, which should have this 5036 * ViewGroup as its parent, 5037 * should be kept around (re-displayed when the ViewGroup draws its children) even if it 5038 * is removed from its parent. This allows animations, such as those used by 5039 * {@link android.app.Fragment} and {@link android.animation.LayoutTransition} to animate 5040 * the removal of views. A call to this method should always be accompanied by a later call 5041 * to {@link #endViewTransition(View)}, such as after an animation on the View has finished, 5042 * so that the View finally gets removed. 5043 * 5044 * @param view The View object to be kept visible even if it gets removed from its parent. 5045 */ 5046 public void startViewTransition(View view) { 5047 if (view.mParent == this) { 5048 if (mTransitioningViews == null) { 5049 mTransitioningViews = new ArrayList<View>(); 5050 } 5051 mTransitioningViews.add(view); 5052 } 5053 } 5054 5055 /** 5056 * This method should always be called following an earlier call to 5057 * {@link #startViewTransition(View)}. The given View is finally removed from its parent 5058 * and will no longer be displayed. Note that this method does not perform the functionality 5059 * of removing a view from its parent; it just discontinues the display of a View that 5060 * has previously been removed. 5061 * 5062 * @return view The View object that has been removed but is being kept around in the visible 5063 * hierarchy by an earlier call to {@link #startViewTransition(View)}. 5064 */ 5065 public void endViewTransition(View view) { 5066 if (mTransitioningViews != null) { 5067 mTransitioningViews.remove(view); 5068 final ArrayList<View> disappearingChildren = mDisappearingChildren; 5069 if (disappearingChildren != null && disappearingChildren.contains(view)) { 5070 disappearingChildren.remove(view); 5071 if (mVisibilityChangingChildren != null && 5072 mVisibilityChangingChildren.contains(view)) { 5073 mVisibilityChangingChildren.remove(view); 5074 } else { 5075 if (view.mAttachInfo != null) { 5076 view.dispatchDetachedFromWindow(); 5077 } 5078 if (view.mParent != null) { 5079 view.mParent = null; 5080 } 5081 } 5082 invalidate(); 5083 } 5084 } 5085 } 5086 5087 private LayoutTransition.TransitionListener mLayoutTransitionListener = 5088 new LayoutTransition.TransitionListener() { 5089 @Override 5090 public void startTransition(LayoutTransition transition, ViewGroup container, 5091 View view, int transitionType) { 5092 // We only care about disappearing items, since we need special logic to keep 5093 // those items visible after they've been 'removed' 5094 if (transitionType == LayoutTransition.DISAPPEARING) { 5095 startViewTransition(view); 5096 } 5097 } 5098 5099 @Override 5100 public void endTransition(LayoutTransition transition, ViewGroup container, 5101 View view, int transitionType) { 5102 if (mLayoutSuppressed && !transition.isChangingLayout()) { 5103 requestLayout(); 5104 mLayoutSuppressed = false; 5105 } 5106 if (transitionType == LayoutTransition.DISAPPEARING && mTransitioningViews != null) { 5107 endViewTransition(view); 5108 } 5109 } 5110 }; 5111 5112 /** 5113 * {@inheritDoc} 5114 */ 5115 @Override 5116 public boolean gatherTransparentRegion(Region region) { 5117 // If no transparent regions requested, we are always opaque. 5118 final boolean meOpaque = (mPrivateFlags & View.REQUEST_TRANSPARENT_REGIONS) == 0; 5119 if (meOpaque && region == null) { 5120 // The caller doesn't care about the region, so stop now. 5121 return true; 5122 } 5123 super.gatherTransparentRegion(region); 5124 final View[] children = mChildren; 5125 final int count = mChildrenCount; 5126 boolean noneOfTheChildrenAreTransparent = true; 5127 for (int i = 0; i < count; i++) { 5128 final View child = children[i]; 5129 if ((child.mViewFlags & VISIBILITY_MASK) == VISIBLE || child.getAnimation() != null) { 5130 if (!child.gatherTransparentRegion(region)) { 5131 noneOfTheChildrenAreTransparent = false; 5132 } 5133 } 5134 } 5135 return meOpaque || noneOfTheChildrenAreTransparent; 5136 } 5137 5138 /** 5139 * {@inheritDoc} 5140 */ 5141 public void requestTransparentRegion(View child) { 5142 if (child != null) { 5143 child.mPrivateFlags |= View.REQUEST_TRANSPARENT_REGIONS; 5144 if (mParent != null) { 5145 mParent.requestTransparentRegion(this); 5146 } 5147 } 5148 } 5149 5150 5151 @Override 5152 protected boolean fitSystemWindows(Rect insets) { 5153 boolean done = super.fitSystemWindows(insets); 5154 if (!done) { 5155 final int count = mChildrenCount; 5156 final View[] children = mChildren; 5157 for (int i = 0; i < count; i++) { 5158 done = children[i].fitSystemWindows(insets); 5159 if (done) { 5160 break; 5161 } 5162 } 5163 } 5164 return done; 5165 } 5166 5167 /** 5168 * Returns the animation listener to which layout animation events are 5169 * sent. 5170 * 5171 * @return an {@link android.view.animation.Animation.AnimationListener} 5172 */ 5173 public Animation.AnimationListener getLayoutAnimationListener() { 5174 return mAnimationListener; 5175 } 5176 5177 @Override 5178 protected void drawableStateChanged() { 5179 super.drawableStateChanged(); 5180 5181 if ((mGroupFlags & FLAG_NOTIFY_CHILDREN_ON_DRAWABLE_STATE_CHANGE) != 0) { 5182 if ((mGroupFlags & FLAG_ADD_STATES_FROM_CHILDREN) != 0) { 5183 throw new IllegalStateException("addStateFromChildren cannot be enabled if a" 5184 + " child has duplicateParentState set to true"); 5185 } 5186 5187 final View[] children = mChildren; 5188 final int count = mChildrenCount; 5189 5190 for (int i = 0; i < count; i++) { 5191 final View child = children[i]; 5192 if ((child.mViewFlags & DUPLICATE_PARENT_STATE) != 0) { 5193 child.refreshDrawableState(); 5194 } 5195 } 5196 } 5197 } 5198 5199 @Override 5200 public void jumpDrawablesToCurrentState() { 5201 super.jumpDrawablesToCurrentState(); 5202 final View[] children = mChildren; 5203 final int count = mChildrenCount; 5204 for (int i = 0; i < count; i++) { 5205 children[i].jumpDrawablesToCurrentState(); 5206 } 5207 } 5208 5209 @Override 5210 protected int[] onCreateDrawableState(int extraSpace) { 5211 if ((mGroupFlags & FLAG_ADD_STATES_FROM_CHILDREN) == 0) { 5212 return super.onCreateDrawableState(extraSpace); 5213 } 5214 5215 int need = 0; 5216 int n = getChildCount(); 5217 for (int i = 0; i < n; i++) { 5218 int[] childState = getChildAt(i).getDrawableState(); 5219 5220 if (childState != null) { 5221 need += childState.length; 5222 } 5223 } 5224 5225 int[] state = super.onCreateDrawableState(extraSpace + need); 5226 5227 for (int i = 0; i < n; i++) { 5228 int[] childState = getChildAt(i).getDrawableState(); 5229 5230 if (childState != null) { 5231 state = mergeDrawableStates(state, childState); 5232 } 5233 } 5234 5235 return state; 5236 } 5237 5238 /** 5239 * Sets whether this ViewGroup's drawable states also include 5240 * its children's drawable states. This is used, for example, to 5241 * make a group appear to be focused when its child EditText or button 5242 * is focused. 5243 */ 5244 public void setAddStatesFromChildren(boolean addsStates) { 5245 if (addsStates) { 5246 mGroupFlags |= FLAG_ADD_STATES_FROM_CHILDREN; 5247 } else { 5248 mGroupFlags &= ~FLAG_ADD_STATES_FROM_CHILDREN; 5249 } 5250 5251 refreshDrawableState(); 5252 } 5253 5254 /** 5255 * Returns whether this ViewGroup's drawable states also include 5256 * its children's drawable states. This is used, for example, to 5257 * make a group appear to be focused when its child EditText or button 5258 * is focused. 5259 */ 5260 public boolean addStatesFromChildren() { 5261 return (mGroupFlags & FLAG_ADD_STATES_FROM_CHILDREN) != 0; 5262 } 5263 5264 /** 5265 * If {link #addStatesFromChildren} is true, refreshes this group's 5266 * drawable state (to include the states from its children). 5267 */ 5268 public void childDrawableStateChanged(View child) { 5269 if ((mGroupFlags & FLAG_ADD_STATES_FROM_CHILDREN) != 0) { 5270 refreshDrawableState(); 5271 } 5272 } 5273 5274 /** 5275 * Specifies the animation listener to which layout animation events must 5276 * be sent. Only 5277 * {@link android.view.animation.Animation.AnimationListener#onAnimationStart(Animation)} 5278 * and 5279 * {@link android.view.animation.Animation.AnimationListener#onAnimationEnd(Animation)} 5280 * are invoked. 5281 * 5282 * @param animationListener the layout animation listener 5283 */ 5284 public void setLayoutAnimationListener(Animation.AnimationListener animationListener) { 5285 mAnimationListener = animationListener; 5286 } 5287 5288 /** 5289 * This method is called by LayoutTransition when there are 'changing' animations that need 5290 * to start after the layout/setup phase. The request is forwarded to the ViewAncestor, who 5291 * starts all pending transitions prior to the drawing phase in the current traversal. 5292 * 5293 * @param transition The LayoutTransition to be started on the next traversal. 5294 * 5295 * @hide 5296 */ 5297 public void requestTransitionStart(LayoutTransition transition) { 5298 ViewRootImpl viewAncestor = getViewRootImpl(); 5299 if (viewAncestor != null) { 5300 viewAncestor.requestTransitionStart(transition); 5301 } 5302 } 5303 5304 @Override 5305 public void onResolvedLayoutDirectionReset() { 5306 // Take care of resetting the children resolution too 5307 final int count = getChildCount(); 5308 for (int i = 0; i < count; i++) { 5309 final View child = getChildAt(i); 5310 if (child.getLayoutDirection() == LAYOUT_DIRECTION_INHERIT) { 5311 child.resetResolvedLayoutDirection(); 5312 } 5313 } 5314 } 5315 5316 @Override 5317 public void onResolvedTextDirectionReset() { 5318 // Take care of resetting the children resolution too 5319 final int count = getChildCount(); 5320 for (int i = 0; i < count; i++) { 5321 final View child = getChildAt(i); 5322 if (child.getTextDirection() == TEXT_DIRECTION_INHERIT) { 5323 child.resetResolvedTextDirection(); 5324 } 5325 } 5326 } 5327 5328 @Override 5329 public void onResolvedTextAlignmentReset() { 5330 // Take care of resetting the children resolution too 5331 final int count = getChildCount(); 5332 for (int i = 0; i < count; i++) { 5333 final View child = getChildAt(i); 5334 if (child.getTextAlignment() == TEXT_ALIGNMENT_INHERIT) { 5335 child.resetResolvedTextAlignment(); 5336 } 5337 } 5338 } 5339 5340 /** 5341 * Return true if the pressed state should be delayed for children or descendants of this 5342 * ViewGroup. Generally, this should be done for containers that can scroll, such as a List. 5343 * This prevents the pressed state from appearing when the user is actually trying to scroll 5344 * the content. 5345 * 5346 * The default implementation returns true for compatibility reasons. Subclasses that do 5347 * not scroll should generally override this method and return false. 5348 */ 5349 public boolean shouldDelayChildPressedState() { 5350 return true; 5351 } 5352 5353 /** @hide */ 5354 protected void onSetLayoutParams(View child, LayoutParams layoutParams) { 5355 } 5356 5357 /** 5358 * LayoutParams are used by views to tell their parents how they want to be 5359 * laid out. See 5360 * {@link android.R.styleable#ViewGroup_Layout ViewGroup Layout Attributes} 5361 * for a list of all child view attributes that this class supports. 5362 * 5363 * <p> 5364 * The base LayoutParams class just describes how big the view wants to be 5365 * for both width and height. For each dimension, it can specify one of: 5366 * <ul> 5367 * <li>FILL_PARENT (renamed MATCH_PARENT in API Level 8 and higher), which 5368 * means that the view wants to be as big as its parent (minus padding) 5369 * <li> WRAP_CONTENT, which means that the view wants to be just big enough 5370 * to enclose its content (plus padding) 5371 * <li> an exact number 5372 * </ul> 5373 * There are subclasses of LayoutParams for different subclasses of 5374 * ViewGroup. For example, AbsoluteLayout has its own subclass of 5375 * LayoutParams which adds an X and Y value.</p> 5376 * 5377 * <div class="special reference"> 5378 * <h3>Developer Guides</h3> 5379 * <p>For more information about creating user interface layouts, read the 5380 * <a href="{@docRoot}guide/topics/ui/declaring-layout.html">XML Layouts</a> developer 5381 * guide.</p></div> 5382 * 5383 * @attr ref android.R.styleable#ViewGroup_Layout_layout_height 5384 * @attr ref android.R.styleable#ViewGroup_Layout_layout_width 5385 */ 5386 public static class LayoutParams { 5387 /** 5388 * Special value for the height or width requested by a View. 5389 * FILL_PARENT means that the view wants to be as big as its parent, 5390 * minus the parent's padding, if any. This value is deprecated 5391 * starting in API Level 8 and replaced by {@link #MATCH_PARENT}. 5392 */ 5393 @SuppressWarnings({"UnusedDeclaration"}) 5394 @Deprecated 5395 public static final int FILL_PARENT = -1; 5396 5397 /** 5398 * Special value for the height or width requested by a View. 5399 * MATCH_PARENT means that the view wants to be as big as its parent, 5400 * minus the parent's padding, if any. Introduced in API Level 8. 5401 */ 5402 public static final int MATCH_PARENT = -1; 5403 5404 /** 5405 * Special value for the height or width requested by a View. 5406 * WRAP_CONTENT means that the view wants to be just large enough to fit 5407 * its own internal content, taking its own padding into account. 5408 */ 5409 public static final int WRAP_CONTENT = -2; 5410 5411 /** 5412 * Information about how wide the view wants to be. Can be one of the 5413 * constants FILL_PARENT (replaced by MATCH_PARENT , 5414 * in API Level 8) or WRAP_CONTENT. or an exact size. 5415 */ 5416 @ViewDebug.ExportedProperty(category = "layout", mapping = { 5417 @ViewDebug.IntToString(from = MATCH_PARENT, to = "MATCH_PARENT"), 5418 @ViewDebug.IntToString(from = WRAP_CONTENT, to = "WRAP_CONTENT") 5419 }) 5420 public int width; 5421 5422 /** 5423 * Information about how tall the view wants to be. Can be one of the 5424 * constants FILL_PARENT (replaced by MATCH_PARENT , 5425 * in API Level 8) or WRAP_CONTENT. or an exact size. 5426 */ 5427 @ViewDebug.ExportedProperty(category = "layout", mapping = { 5428 @ViewDebug.IntToString(from = MATCH_PARENT, to = "MATCH_PARENT"), 5429 @ViewDebug.IntToString(from = WRAP_CONTENT, to = "WRAP_CONTENT") 5430 }) 5431 public int height; 5432 5433 /** 5434 * Used to animate layouts. 5435 */ 5436 public LayoutAnimationController.AnimationParameters layoutAnimationParameters; 5437 5438 /** 5439 * Creates a new set of layout parameters. The values are extracted from 5440 * the supplied attributes set and context. The XML attributes mapped 5441 * to this set of layout parameters are: 5442 * 5443 * <ul> 5444 * <li><code>layout_width</code>: the width, either an exact value, 5445 * {@link #WRAP_CONTENT}, or {@link #FILL_PARENT} (replaced by 5446 * {@link #MATCH_PARENT} in API Level 8)</li> 5447 * <li><code>layout_height</code>: the height, either an exact value, 5448 * {@link #WRAP_CONTENT}, or {@link #FILL_PARENT} (replaced by 5449 * {@link #MATCH_PARENT} in API Level 8)</li> 5450 * </ul> 5451 * 5452 * @param c the application environment 5453 * @param attrs the set of attributes from which to extract the layout 5454 * parameters' values 5455 */ 5456 public LayoutParams(Context c, AttributeSet attrs) { 5457 TypedArray a = c.obtainStyledAttributes(attrs, R.styleable.ViewGroup_Layout); 5458 setBaseAttributes(a, 5459 R.styleable.ViewGroup_Layout_layout_width, 5460 R.styleable.ViewGroup_Layout_layout_height); 5461 a.recycle(); 5462 } 5463 5464 /** 5465 * Creates a new set of layout parameters with the specified width 5466 * and height. 5467 * 5468 * @param width the width, either {@link #WRAP_CONTENT}, 5469 * {@link #FILL_PARENT} (replaced by {@link #MATCH_PARENT} in 5470 * API Level 8), or a fixed size in pixels 5471 * @param height the height, either {@link #WRAP_CONTENT}, 5472 * {@link #FILL_PARENT} (replaced by {@link #MATCH_PARENT} in 5473 * API Level 8), or a fixed size in pixels 5474 */ 5475 public LayoutParams(int width, int height) { 5476 this.width = width; 5477 this.height = height; 5478 } 5479 5480 /** 5481 * Copy constructor. Clones the width and height values of the source. 5482 * 5483 * @param source The layout params to copy from. 5484 */ 5485 public LayoutParams(LayoutParams source) { 5486 this.width = source.width; 5487 this.height = source.height; 5488 } 5489 5490 /** 5491 * Used internally by MarginLayoutParams. 5492 * @hide 5493 */ 5494 LayoutParams() { 5495 } 5496 5497 /** 5498 * Extracts the layout parameters from the supplied attributes. 5499 * 5500 * @param a the style attributes to extract the parameters from 5501 * @param widthAttr the identifier of the width attribute 5502 * @param heightAttr the identifier of the height attribute 5503 */ 5504 protected void setBaseAttributes(TypedArray a, int widthAttr, int heightAttr) { 5505 width = a.getLayoutDimension(widthAttr, "layout_width"); 5506 height = a.getLayoutDimension(heightAttr, "layout_height"); 5507 } 5508 5509 /** 5510 * Resolve layout parameters depending on the layout direction. Subclasses that care about 5511 * layoutDirection changes should override this method. The default implementation does 5512 * nothing. 5513 * 5514 * @param layoutDirection the direction of the layout 5515 * 5516 * {@link View#LAYOUT_DIRECTION_LTR} 5517 * {@link View#LAYOUT_DIRECTION_RTL} 5518 */ 5519 public void onResolveLayoutDirection(int layoutDirection) { 5520 } 5521 5522 /** 5523 * Returns a String representation of this set of layout parameters. 5524 * 5525 * @param output the String to prepend to the internal representation 5526 * @return a String with the following format: output + 5527 * "ViewGroup.LayoutParams={ width=WIDTH, height=HEIGHT }" 5528 * 5529 * @hide 5530 */ 5531 public String debug(String output) { 5532 return output + "ViewGroup.LayoutParams={ width=" 5533 + sizeToString(width) + ", height=" + sizeToString(height) + " }"; 5534 } 5535 5536 /** 5537 * Use {@code canvas} to draw suitable debugging annotations for these LayoutParameters. 5538 * 5539 * @param view the view that contains these layout parameters 5540 * @param canvas the canvas on which to draw 5541 * 5542 * @hide 5543 */ 5544 public void onDebugDraw(View view, Canvas canvas) { 5545 } 5546 5547 /** 5548 * Converts the specified size to a readable String. 5549 * 5550 * @param size the size to convert 5551 * @return a String instance representing the supplied size 5552 * 5553 * @hide 5554 */ 5555 protected static String sizeToString(int size) { 5556 if (size == WRAP_CONTENT) { 5557 return "wrap-content"; 5558 } 5559 if (size == MATCH_PARENT) { 5560 return "match-parent"; 5561 } 5562 return String.valueOf(size); 5563 } 5564 } 5565 5566 /** 5567 * Per-child layout information for layouts that support margins. 5568 * See 5569 * {@link android.R.styleable#ViewGroup_MarginLayout ViewGroup Margin Layout Attributes} 5570 * for a list of all child view attributes that this class supports. 5571 */ 5572 public static class MarginLayoutParams extends ViewGroup.LayoutParams { 5573 /** 5574 * The left margin in pixels of the child. 5575 * Call {@link ViewGroup#setLayoutParams(LayoutParams)} after reassigning a new value 5576 * to this field. 5577 */ 5578 @ViewDebug.ExportedProperty(category = "layout") 5579 public int leftMargin; 5580 5581 /** 5582 * The top margin in pixels of the child. 5583 * Call {@link ViewGroup#setLayoutParams(LayoutParams)} after reassigning a new value 5584 * to this field. 5585 */ 5586 @ViewDebug.ExportedProperty(category = "layout") 5587 public int topMargin; 5588 5589 /** 5590 * The right margin in pixels of the child. 5591 * Call {@link ViewGroup#setLayoutParams(LayoutParams)} after reassigning a new value 5592 * to this field. 5593 */ 5594 @ViewDebug.ExportedProperty(category = "layout") 5595 public int rightMargin; 5596 5597 /** 5598 * The bottom margin in pixels of the child. 5599 * Call {@link ViewGroup#setLayoutParams(LayoutParams)} after reassigning a new value 5600 * to this field. 5601 */ 5602 @ViewDebug.ExportedProperty(category = "layout") 5603 public int bottomMargin; 5604 5605 /** 5606 * The start margin in pixels of the child. 5607 * Call {@link ViewGroup#setLayoutParams(LayoutParams)} after reassigning a new value 5608 * to this field. 5609 */ 5610 @ViewDebug.ExportedProperty(category = "layout") 5611 public int startMargin = DEFAULT_RELATIVE; 5612 5613 /** 5614 * The end margin in pixels of the child. 5615 * Call {@link ViewGroup#setLayoutParams(LayoutParams)} after reassigning a new value 5616 * to this field. 5617 */ 5618 @ViewDebug.ExportedProperty(category = "layout") 5619 public int endMargin = DEFAULT_RELATIVE; 5620 5621 /** 5622 * The default start and end margin. 5623 */ 5624 static private final int DEFAULT_RELATIVE = Integer.MIN_VALUE; 5625 5626 /** 5627 * Creates a new set of layout parameters. The values are extracted from 5628 * the supplied attributes set and context. 5629 * 5630 * @param c the application environment 5631 * @param attrs the set of attributes from which to extract the layout 5632 * parameters' values 5633 */ 5634 public MarginLayoutParams(Context c, AttributeSet attrs) { 5635 super(); 5636 5637 TypedArray a = c.obtainStyledAttributes(attrs, R.styleable.ViewGroup_MarginLayout); 5638 setBaseAttributes(a, 5639 R.styleable.ViewGroup_MarginLayout_layout_width, 5640 R.styleable.ViewGroup_MarginLayout_layout_height); 5641 5642 int margin = a.getDimensionPixelSize( 5643 com.android.internal.R.styleable.ViewGroup_MarginLayout_layout_margin, -1); 5644 if (margin >= 0) { 5645 leftMargin = margin; 5646 topMargin = margin; 5647 rightMargin= margin; 5648 bottomMargin = margin; 5649 } else { 5650 leftMargin = a.getDimensionPixelSize( 5651 R.styleable.ViewGroup_MarginLayout_layout_marginLeft, 0); 5652 topMargin = a.getDimensionPixelSize( 5653 R.styleable.ViewGroup_MarginLayout_layout_marginTop, 0); 5654 rightMargin = a.getDimensionPixelSize( 5655 R.styleable.ViewGroup_MarginLayout_layout_marginRight, 0); 5656 bottomMargin = a.getDimensionPixelSize( 5657 R.styleable.ViewGroup_MarginLayout_layout_marginBottom, 0); 5658 startMargin = a.getDimensionPixelSize( 5659 R.styleable.ViewGroup_MarginLayout_layout_marginStart, DEFAULT_RELATIVE); 5660 endMargin = a.getDimensionPixelSize( 5661 R.styleable.ViewGroup_MarginLayout_layout_marginEnd, DEFAULT_RELATIVE); 5662 } 5663 5664 a.recycle(); 5665 } 5666 5667 /** 5668 * {@inheritDoc} 5669 */ 5670 public MarginLayoutParams(int width, int height) { 5671 super(width, height); 5672 } 5673 5674 /** 5675 * Copy constructor. Clones the width, height and margin values of the source. 5676 * 5677 * @param source The layout params to copy from. 5678 */ 5679 public MarginLayoutParams(MarginLayoutParams source) { 5680 this.width = source.width; 5681 this.height = source.height; 5682 5683 this.leftMargin = source.leftMargin; 5684 this.topMargin = source.topMargin; 5685 this.rightMargin = source.rightMargin; 5686 this.bottomMargin = source.bottomMargin; 5687 this.startMargin = source.startMargin; 5688 this.endMargin = source.endMargin; 5689 } 5690 5691 /** 5692 * {@inheritDoc} 5693 */ 5694 public MarginLayoutParams(LayoutParams source) { 5695 super(source); 5696 } 5697 5698 /** 5699 * Sets the margins, in pixels. A call to {@link android.view.View#requestLayout()} needs 5700 * to be done so that the new margins are taken into account. Left and right margins may be 5701 * overriden by {@link android.view.View#requestLayout()} depending on layout direction. 5702 * 5703 * @param left the left margin size 5704 * @param top the top margin size 5705 * @param right the right margin size 5706 * @param bottom the bottom margin size 5707 * 5708 * @attr ref android.R.styleable#ViewGroup_MarginLayout_layout_marginLeft 5709 * @attr ref android.R.styleable#ViewGroup_MarginLayout_layout_marginTop 5710 * @attr ref android.R.styleable#ViewGroup_MarginLayout_layout_marginRight 5711 * @attr ref android.R.styleable#ViewGroup_MarginLayout_layout_marginBottom 5712 */ 5713 public void setMargins(int left, int top, int right, int bottom) { 5714 leftMargin = left; 5715 topMargin = top; 5716 rightMargin = right; 5717 bottomMargin = bottom; 5718 } 5719 5720 /** 5721 * Sets the relative margins, in pixels. A call to {@link android.view.View#requestLayout()} 5722 * needs to be done so that the new relative margins are taken into account. Left and right 5723 * margins may be overriden by {@link android.view.View#requestLayout()} depending on layout 5724 * direction. 5725 * 5726 * @param start the start margin size 5727 * @param top the top margin size 5728 * @param end the right margin size 5729 * @param bottom the bottom margin size 5730 * 5731 * @attr ref android.R.styleable#ViewGroup_MarginLayout_layout_marginStart 5732 * @attr ref android.R.styleable#ViewGroup_MarginLayout_layout_marginTop 5733 * @attr ref android.R.styleable#ViewGroup_MarginLayout_layout_marginEnd 5734 * @attr ref android.R.styleable#ViewGroup_MarginLayout_layout_marginBottom 5735 * 5736 * @hide 5737 */ 5738 public void setMarginsRelative(int start, int top, int end, int bottom) { 5739 startMargin = start; 5740 topMargin = top; 5741 endMargin = end; 5742 bottomMargin = bottom; 5743 } 5744 5745 /** 5746 * Returns the start margin in pixels. 5747 * 5748 * @attr ref android.R.styleable#ViewGroup_MarginLayout_layout_marginStart 5749 * 5750 * @return the start margin in pixels. 5751 */ 5752 public int getMarginStart() { 5753 return startMargin; 5754 } 5755 5756 /** 5757 * Returns the end margin in pixels. 5758 * 5759 * @attr ref android.R.styleable#ViewGroup_MarginLayout_layout_marginEnd 5760 * 5761 * @return the end margin in pixels. 5762 */ 5763 public int getMarginEnd() { 5764 return endMargin; 5765 } 5766 5767 /** 5768 * Check if margins are relative. 5769 * 5770 * @attr ref android.R.styleable#ViewGroup_MarginLayout_layout_marginStart 5771 * @attr ref android.R.styleable#ViewGroup_MarginLayout_layout_marginEnd 5772 * 5773 * @return true if either marginStart or marginEnd has been set 5774 */ 5775 public boolean isMarginRelative() { 5776 return (startMargin != DEFAULT_RELATIVE) || (endMargin != DEFAULT_RELATIVE); 5777 } 5778 5779 /** 5780 * This will be called by {@link android.view.View#requestLayout()}. Left and Right margins 5781 * may be overridden depending on layout direction. 5782 */ 5783 @Override 5784 public void onResolveLayoutDirection(int layoutDirection) { 5785 switch(layoutDirection) { 5786 case View.LAYOUT_DIRECTION_RTL: 5787 leftMargin = (endMargin > DEFAULT_RELATIVE) ? endMargin : leftMargin; 5788 rightMargin = (startMargin > DEFAULT_RELATIVE) ? startMargin : rightMargin; 5789 break; 5790 case View.LAYOUT_DIRECTION_LTR: 5791 default: 5792 leftMargin = (startMargin > DEFAULT_RELATIVE) ? startMargin : leftMargin; 5793 rightMargin = (endMargin > DEFAULT_RELATIVE) ? endMargin : rightMargin; 5794 break; 5795 } 5796 } 5797 5798 /** 5799 * @hide 5800 */ 5801 @Override 5802 public void onDebugDraw(View view, Canvas canvas) { 5803 drawRect(canvas, 5804 view.getLeft() - leftMargin, 5805 view.getTop() - topMargin, 5806 view.getRight() + rightMargin, 5807 view.getBottom() + bottomMargin, Color.MAGENTA); 5808 } 5809 } 5810 5811 /* Describes a touched view and the ids of the pointers that it has captured. 5812 * 5813 * This code assumes that pointer ids are always in the range 0..31 such that 5814 * it can use a bitfield to track which pointer ids are present. 5815 * As it happens, the lower layers of the input dispatch pipeline also use the 5816 * same trick so the assumption should be safe here... 5817 */ 5818 private static final class TouchTarget { 5819 private static final int MAX_RECYCLED = 32; 5820 private static final Object sRecycleLock = new Object(); 5821 private static TouchTarget sRecycleBin; 5822 private static int sRecycledCount; 5823 5824 public static final int ALL_POINTER_IDS = -1; // all ones 5825 5826 // The touched child view. 5827 public View child; 5828 5829 // The combined bit mask of pointer ids for all pointers captured by the target. 5830 public int pointerIdBits; 5831 5832 // The next target in the target list. 5833 public TouchTarget next; 5834 5835 private TouchTarget() { 5836 } 5837 5838 public static TouchTarget obtain(View child, int pointerIdBits) { 5839 final TouchTarget target; 5840 synchronized (sRecycleLock) { 5841 if (sRecycleBin == null) { 5842 target = new TouchTarget(); 5843 } else { 5844 target = sRecycleBin; 5845 sRecycleBin = target.next; 5846 sRecycledCount--; 5847 target.next = null; 5848 } 5849 } 5850 target.child = child; 5851 target.pointerIdBits = pointerIdBits; 5852 return target; 5853 } 5854 5855 public void recycle() { 5856 synchronized (sRecycleLock) { 5857 if (sRecycledCount < MAX_RECYCLED) { 5858 next = sRecycleBin; 5859 sRecycleBin = this; 5860 sRecycledCount += 1; 5861 } else { 5862 next = null; 5863 } 5864 child = null; 5865 } 5866 } 5867 } 5868 5869 /* Describes a hovered view. */ 5870 private static final class HoverTarget { 5871 private static final int MAX_RECYCLED = 32; 5872 private static final Object sRecycleLock = new Object(); 5873 private static HoverTarget sRecycleBin; 5874 private static int sRecycledCount; 5875 5876 // The hovered child view. 5877 public View child; 5878 5879 // The next target in the target list. 5880 public HoverTarget next; 5881 5882 private HoverTarget() { 5883 } 5884 5885 public static HoverTarget obtain(View child) { 5886 final HoverTarget target; 5887 synchronized (sRecycleLock) { 5888 if (sRecycleBin == null) { 5889 target = new HoverTarget(); 5890 } else { 5891 target = sRecycleBin; 5892 sRecycleBin = target.next; 5893 sRecycledCount--; 5894 target.next = null; 5895 } 5896 } 5897 target.child = child; 5898 return target; 5899 } 5900 5901 public void recycle() { 5902 synchronized (sRecycleLock) { 5903 if (sRecycledCount < MAX_RECYCLED) { 5904 next = sRecycleBin; 5905 sRecycleBin = this; 5906 sRecycledCount += 1; 5907 } else { 5908 next = null; 5909 } 5910 child = null; 5911 } 5912 } 5913 } 5914 5915 /** 5916 * Pooled class that orderes the children of a ViewGroup from start 5917 * to end based on how they are laid out and the layout direction. 5918 */ 5919 static class ChildListForAccessibility { 5920 5921 private static final int MAX_POOL_SIZE = 32; 5922 5923 private static final Object sPoolLock = new Object(); 5924 5925 private static ChildListForAccessibility sPool; 5926 5927 private static int sPoolSize; 5928 5929 private boolean mIsPooled; 5930 5931 private ChildListForAccessibility mNext; 5932 5933 private final ArrayList<View> mChildren = new ArrayList<View>(); 5934 5935 private final ArrayList<ViewLocationHolder> mHolders = new ArrayList<ViewLocationHolder>(); 5936 5937 public static ChildListForAccessibility obtain(ViewGroup parent, boolean sort) { 5938 ChildListForAccessibility list = null; 5939 synchronized (sPoolLock) { 5940 if (sPool != null) { 5941 list = sPool; 5942 sPool = list.mNext; 5943 list.mNext = null; 5944 list.mIsPooled = false; 5945 sPoolSize--; 5946 } else { 5947 list = new ChildListForAccessibility(); 5948 } 5949 list.init(parent, sort); 5950 return list; 5951 } 5952 } 5953 5954 public void recycle() { 5955 if (mIsPooled) { 5956 throw new IllegalStateException("Instance already recycled."); 5957 } 5958 clear(); 5959 synchronized (sPoolLock) { 5960 if (sPoolSize < MAX_POOL_SIZE) { 5961 mNext = sPool; 5962 mIsPooled = true; 5963 sPool = this; 5964 sPoolSize++; 5965 } 5966 } 5967 } 5968 5969 public int getChildCount() { 5970 return mChildren.size(); 5971 } 5972 5973 public View getChildAt(int index) { 5974 return mChildren.get(index); 5975 } 5976 5977 public int getChildIndex(View child) { 5978 return mChildren.indexOf(child); 5979 } 5980 5981 private void init(ViewGroup parent, boolean sort) { 5982 ArrayList<View> children = mChildren; 5983 final int childCount = parent.getChildCount(); 5984 for (int i = 0; i < childCount; i++) { 5985 View child = parent.getChildAt(i); 5986 children.add(child); 5987 } 5988 if (sort) { 5989 ArrayList<ViewLocationHolder> holders = mHolders; 5990 for (int i = 0; i < childCount; i++) { 5991 View child = children.get(i); 5992 ViewLocationHolder holder = ViewLocationHolder.obtain(parent, child); 5993 holders.add(holder); 5994 } 5995 Collections.sort(holders); 5996 for (int i = 0; i < childCount; i++) { 5997 ViewLocationHolder holder = holders.get(i); 5998 children.set(i, holder.mView); 5999 holder.recycle(); 6000 } 6001 holders.clear(); 6002 } 6003 } 6004 6005 private void clear() { 6006 mChildren.clear(); 6007 } 6008 } 6009 6010 /** 6011 * Pooled class that holds a View and its location with respect to 6012 * a specified root. This enables sorting of views based on their 6013 * coordinates without recomputing the position relative to the root 6014 * on every comparison. 6015 */ 6016 static class ViewLocationHolder implements Comparable<ViewLocationHolder> { 6017 6018 private static final int MAX_POOL_SIZE = 32; 6019 6020 private static final Object sPoolLock = new Object(); 6021 6022 private static ViewLocationHolder sPool; 6023 6024 private static int sPoolSize; 6025 6026 private boolean mIsPooled; 6027 6028 private ViewLocationHolder mNext; 6029 6030 private final Rect mLocation = new Rect(); 6031 6032 public View mView; 6033 6034 private int mLayoutDirection; 6035 6036 public static ViewLocationHolder obtain(ViewGroup root, View view) { 6037 ViewLocationHolder holder = null; 6038 synchronized (sPoolLock) { 6039 if (sPool != null) { 6040 holder = sPool; 6041 sPool = holder.mNext; 6042 holder.mNext = null; 6043 holder.mIsPooled = false; 6044 sPoolSize--; 6045 } else { 6046 holder = new ViewLocationHolder(); 6047 } 6048 holder.init(root, view); 6049 return holder; 6050 } 6051 } 6052 6053 public void recycle() { 6054 if (mIsPooled) { 6055 throw new IllegalStateException("Instance already recycled."); 6056 } 6057 clear(); 6058 synchronized (sPoolLock) { 6059 if (sPoolSize < MAX_POOL_SIZE) { 6060 mNext = sPool; 6061 mIsPooled = true; 6062 sPool = this; 6063 sPoolSize++; 6064 } 6065 } 6066 } 6067 6068 @Override 6069 public int compareTo(ViewLocationHolder another) { 6070 // This instance is greater than an invalid argument. 6071 if (another == null) { 6072 return 1; 6073 } 6074 if (getClass() != another.getClass()) { 6075 return 1; 6076 } 6077 // First is above second. 6078 if (mLocation.bottom - another.mLocation.top <= 0) { 6079 return -1; 6080 } 6081 // First is below second. 6082 if (mLocation.top - another.mLocation.bottom >= 0) { 6083 return 1; 6084 } 6085 // LTR 6086 if (mLayoutDirection == LAYOUT_DIRECTION_LTR) { 6087 final int leftDifference = mLocation.left - another.mLocation.left; 6088 // First more to the left than second. 6089 if (leftDifference != 0) { 6090 return leftDifference; 6091 } 6092 } else { // RTL 6093 final int rightDifference = mLocation.right - another.mLocation.right; 6094 // First more to the right than second. 6095 if (rightDifference != 0) { 6096 return -rightDifference; 6097 } 6098 } 6099 // Break tie by top. 6100 final int topDiference = mLocation.top - another.mLocation.top; 6101 if (topDiference != 0) { 6102 return topDiference; 6103 } 6104 // Break tie by height. 6105 final int heightDiference = mLocation.height() - another.mLocation.height(); 6106 if (heightDiference != 0) { 6107 return -heightDiference; 6108 } 6109 // Break tie by width. 6110 final int widthDiference = mLocation.width() - another.mLocation.width(); 6111 if (widthDiference != 0) { 6112 return -widthDiference; 6113 } 6114 // Just break the tie somehow. The accessibliity ids are unique 6115 // and stable, hence this is deterministic tie breaking. 6116 return mView.getAccessibilityViewId() - another.mView.getAccessibilityViewId(); 6117 } 6118 6119 private void init(ViewGroup root, View view) { 6120 Rect viewLocation = mLocation; 6121 view.getDrawingRect(viewLocation); 6122 root.offsetDescendantRectToMyCoords(view, viewLocation); 6123 mView = view; 6124 mLayoutDirection = root.getResolvedLayoutDirection(); 6125 } 6126 6127 private void clear() { 6128 mView = null; 6129 mLocation.set(0, 0, 0, 0); 6130 } 6131 } 6132} 6133