ViewGroup.java revision 3fb3d7c4e756bd32d5abde0abca9ab52d559bc84
1/* 2 * Copyright (C) 2006 The Android Open Source Project 3 * 4 * Licensed under the Apache License, Version 2.0 (the "License"); 5 * you may not use this file except in compliance with the License. 6 * You may obtain a copy of the License at 7 * 8 * http://www.apache.org/licenses/LICENSE-2.0 9 * 10 * Unless required by applicable law or agreed to in writing, software 11 * distributed under the License is distributed on an "AS IS" BASIS, 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 13 * See the License for the specific language governing permissions and 14 * limitations under the License. 15 */ 16 17package android.view; 18 19import android.animation.LayoutTransition; 20import android.content.Context; 21import android.content.res.Configuration; 22import android.content.res.TypedArray; 23import android.graphics.Bitmap; 24import android.graphics.Canvas; 25import android.graphics.Matrix; 26import android.graphics.Paint; 27import android.graphics.PointF; 28import android.graphics.Rect; 29import android.graphics.RectF; 30import android.graphics.Region; 31import android.os.Build; 32import android.os.Parcelable; 33import android.os.SystemClock; 34import android.util.AttributeSet; 35import android.util.Log; 36import android.util.SparseArray; 37import android.view.accessibility.AccessibilityEvent; 38import android.view.animation.AlphaAnimation; 39import android.view.animation.Animation; 40import android.view.animation.AnimationUtils; 41import android.view.animation.LayoutAnimationController; 42import android.view.animation.Transformation; 43import com.android.internal.R; 44import com.android.internal.util.Predicate; 45 46import java.util.ArrayList; 47import java.util.HashSet; 48 49/** 50 * <p> 51 * A <code>ViewGroup</code> is a special view that can contain other views 52 * (called children.) The view group is the base class for layouts and views 53 * containers. This class also defines the 54 * {@link android.view.ViewGroup.LayoutParams} class which serves as the base 55 * class for layouts parameters. 56 * </p> 57 * 58 * <p> 59 * Also see {@link LayoutParams} for layout attributes. 60 * </p> 61 * 62 * @attr ref android.R.styleable#ViewGroup_clipChildren 63 * @attr ref android.R.styleable#ViewGroup_clipToPadding 64 * @attr ref android.R.styleable#ViewGroup_layoutAnimation 65 * @attr ref android.R.styleable#ViewGroup_animationCache 66 * @attr ref android.R.styleable#ViewGroup_persistentDrawingCache 67 * @attr ref android.R.styleable#ViewGroup_alwaysDrawnWithCache 68 * @attr ref android.R.styleable#ViewGroup_addStatesFromChildren 69 * @attr ref android.R.styleable#ViewGroup_descendantFocusability 70 * @attr ref android.R.styleable#ViewGroup_animateLayoutChanges 71 */ 72public abstract class ViewGroup extends View implements ViewParent, ViewManager { 73 74 private static final boolean DBG = false; 75 76 /** 77 * Views which have been hidden or removed which need to be animated on 78 * their way out. 79 * This field should be made private, so it is hidden from the SDK. 80 * {@hide} 81 */ 82 protected ArrayList<View> mDisappearingChildren; 83 84 /** 85 * Listener used to propagate events indicating when children are added 86 * and/or removed from a view group. 87 * This field should be made private, so it is hidden from the SDK. 88 * {@hide} 89 */ 90 protected OnHierarchyChangeListener mOnHierarchyChangeListener; 91 92 // The view contained within this ViewGroup that has or contains focus. 93 private View mFocused; 94 95 /** 96 * A Transformation used when drawing children, to 97 * apply on the child being drawn. 98 */ 99 private final Transformation mChildTransformation = new Transformation(); 100 101 /** 102 * Used to track the current invalidation region. 103 */ 104 private RectF mInvalidateRegion; 105 106 /** 107 * A Transformation used to calculate a correct 108 * invalidation area when the application is autoscaled. 109 */ 110 private Transformation mInvalidationTransformation; 111 112 // View currently under an ongoing drag 113 private View mCurrentDragView; 114 115 // Metadata about the ongoing drag 116 private DragEvent mCurrentDrag; 117 private HashSet<View> mDragNotifiedChildren; 118 119 // Does this group have a child that can accept the current drag payload? 120 private boolean mChildAcceptsDrag; 121 122 // Used during drag dispatch 123 private final PointF mLocalPoint = new PointF(); 124 125 // Layout animation 126 private LayoutAnimationController mLayoutAnimationController; 127 private Animation.AnimationListener mAnimationListener; 128 129 // First touch target in the linked list of touch targets. 130 private TouchTarget mFirstTouchTarget; 131 132 // Temporary arrays for splitting pointers. 133 private int[] mTmpPointerIndexMap; 134 private int[] mTmpPointerIds; 135 private MotionEvent.PointerCoords[] mTmpPointerCoords; 136 137 // For debugging only. You can see these in hierarchyviewer. 138 @SuppressWarnings({"FieldCanBeLocal", "UnusedDeclaration"}) 139 @ViewDebug.ExportedProperty(category = "events") 140 private long mLastTouchDownTime; 141 @ViewDebug.ExportedProperty(category = "events") 142 private int mLastTouchDownIndex = -1; 143 @SuppressWarnings({"FieldCanBeLocal", "UnusedDeclaration"}) 144 @ViewDebug.ExportedProperty(category = "events") 145 private float mLastTouchDownX; 146 @SuppressWarnings({"FieldCanBeLocal", "UnusedDeclaration"}) 147 @ViewDebug.ExportedProperty(category = "events") 148 private float mLastTouchDownY; 149 150 // Child which last received ACTION_HOVER_ENTER and ACTION_HOVER_MOVE. 151 private View mHoveredChild; 152 153 /** 154 * Internal flags. 155 * 156 * This field should be made private, so it is hidden from the SDK. 157 * {@hide} 158 */ 159 protected int mGroupFlags; 160 161 // When set, ViewGroup invalidates only the child's rectangle 162 // Set by default 163 private static final int FLAG_CLIP_CHILDREN = 0x1; 164 165 // When set, ViewGroup excludes the padding area from the invalidate rectangle 166 // Set by default 167 private static final int FLAG_CLIP_TO_PADDING = 0x2; 168 169 // When set, dispatchDraw() will invoke invalidate(); this is set by drawChild() when 170 // a child needs to be invalidated and FLAG_OPTIMIZE_INVALIDATE is set 171 private static final int FLAG_INVALIDATE_REQUIRED = 0x4; 172 173 // When set, dispatchDraw() will run the layout animation and unset the flag 174 private static final int FLAG_RUN_ANIMATION = 0x8; 175 176 // When set, there is either no layout animation on the ViewGroup or the layout 177 // animation is over 178 // Set by default 179 private static final int FLAG_ANIMATION_DONE = 0x10; 180 181 // If set, this ViewGroup has padding; if unset there is no padding and we don't need 182 // to clip it, even if FLAG_CLIP_TO_PADDING is set 183 private static final int FLAG_PADDING_NOT_NULL = 0x20; 184 185 // When set, this ViewGroup caches its children in a Bitmap before starting a layout animation 186 // Set by default 187 private static final int FLAG_ANIMATION_CACHE = 0x40; 188 189 // When set, this ViewGroup converts calls to invalidate(Rect) to invalidate() during a 190 // layout animation; this avoid clobbering the hierarchy 191 // Automatically set when the layout animation starts, depending on the animation's 192 // characteristics 193 private static final int FLAG_OPTIMIZE_INVALIDATE = 0x80; 194 195 // When set, the next call to drawChild() will clear mChildTransformation's matrix 196 private static final int FLAG_CLEAR_TRANSFORMATION = 0x100; 197 198 // When set, this ViewGroup invokes mAnimationListener.onAnimationEnd() and removes 199 // the children's Bitmap caches if necessary 200 // This flag is set when the layout animation is over (after FLAG_ANIMATION_DONE is set) 201 private static final int FLAG_NOTIFY_ANIMATION_LISTENER = 0x200; 202 203 /** 204 * When set, the drawing method will call {@link #getChildDrawingOrder(int, int)} 205 * to get the index of the child to draw for that iteration. 206 * 207 * @hide 208 */ 209 protected static final int FLAG_USE_CHILD_DRAWING_ORDER = 0x400; 210 211 /** 212 * When set, this ViewGroup supports static transformations on children; this causes 213 * {@link #getChildStaticTransformation(View, android.view.animation.Transformation)} to be 214 * invoked when a child is drawn. 215 * 216 * Any subclass overriding 217 * {@link #getChildStaticTransformation(View, android.view.animation.Transformation)} should 218 * set this flags in {@link #mGroupFlags}. 219 * 220 * {@hide} 221 */ 222 protected static final int FLAG_SUPPORT_STATIC_TRANSFORMATIONS = 0x800; 223 224 // When the previous drawChild() invocation used an alpha value that was lower than 225 // 1.0 and set it in mCachePaint 226 private static final int FLAG_ALPHA_LOWER_THAN_ONE = 0x1000; 227 228 /** 229 * When set, this ViewGroup's drawable states also include those 230 * of its children. 231 */ 232 private static final int FLAG_ADD_STATES_FROM_CHILDREN = 0x2000; 233 234 /** 235 * When set, this ViewGroup tries to always draw its children using their drawing cache. 236 */ 237 private static final int FLAG_ALWAYS_DRAWN_WITH_CACHE = 0x4000; 238 239 /** 240 * When set, and if FLAG_ALWAYS_DRAWN_WITH_CACHE is not set, this ViewGroup will try to 241 * draw its children with their drawing cache. 242 */ 243 private static final int FLAG_CHILDREN_DRAWN_WITH_CACHE = 0x8000; 244 245 /** 246 * When set, this group will go through its list of children to notify them of 247 * any drawable state change. 248 */ 249 private static final int FLAG_NOTIFY_CHILDREN_ON_DRAWABLE_STATE_CHANGE = 0x10000; 250 251 private static final int FLAG_MASK_FOCUSABILITY = 0x60000; 252 253 /** 254 * This view will get focus before any of its descendants. 255 */ 256 public static final int FOCUS_BEFORE_DESCENDANTS = 0x20000; 257 258 /** 259 * This view will get focus only if none of its descendants want it. 260 */ 261 public static final int FOCUS_AFTER_DESCENDANTS = 0x40000; 262 263 /** 264 * This view will block any of its descendants from getting focus, even 265 * if they are focusable. 266 */ 267 public static final int FOCUS_BLOCK_DESCENDANTS = 0x60000; 268 269 /** 270 * Used to map between enum in attrubutes and flag values. 271 */ 272 private static final int[] DESCENDANT_FOCUSABILITY_FLAGS = 273 {FOCUS_BEFORE_DESCENDANTS, FOCUS_AFTER_DESCENDANTS, 274 FOCUS_BLOCK_DESCENDANTS}; 275 276 /** 277 * When set, this ViewGroup should not intercept touch events. 278 * {@hide} 279 */ 280 protected static final int FLAG_DISALLOW_INTERCEPT = 0x80000; 281 282 /** 283 * When set, this ViewGroup will split MotionEvents to multiple child Views when appropriate. 284 */ 285 private static final int FLAG_SPLIT_MOTION_EVENTS = 0x200000; 286 287 /** 288 * Indicates which types of drawing caches are to be kept in memory. 289 * This field should be made private, so it is hidden from the SDK. 290 * {@hide} 291 */ 292 protected int mPersistentDrawingCache; 293 294 /** 295 * Used to indicate that no drawing cache should be kept in memory. 296 */ 297 public static final int PERSISTENT_NO_CACHE = 0x0; 298 299 /** 300 * Used to indicate that the animation drawing cache should be kept in memory. 301 */ 302 public static final int PERSISTENT_ANIMATION_CACHE = 0x1; 303 304 /** 305 * Used to indicate that the scrolling drawing cache should be kept in memory. 306 */ 307 public static final int PERSISTENT_SCROLLING_CACHE = 0x2; 308 309 /** 310 * Used to indicate that all drawing caches should be kept in memory. 311 */ 312 public static final int PERSISTENT_ALL_CACHES = 0x3; 313 314 /** 315 * We clip to padding when FLAG_CLIP_TO_PADDING and FLAG_PADDING_NOT_NULL 316 * are set at the same time. 317 */ 318 protected static final int CLIP_TO_PADDING_MASK = FLAG_CLIP_TO_PADDING | FLAG_PADDING_NOT_NULL; 319 320 // Index of the child's left position in the mLocation array 321 private static final int CHILD_LEFT_INDEX = 0; 322 // Index of the child's top position in the mLocation array 323 private static final int CHILD_TOP_INDEX = 1; 324 325 // Child views of this ViewGroup 326 private View[] mChildren; 327 // Number of valid children in the mChildren array, the rest should be null or not 328 // considered as children 329 330 private boolean mLayoutSuppressed = false; 331 332 private int mChildrenCount; 333 334 private static final int ARRAY_INITIAL_CAPACITY = 12; 335 private static final int ARRAY_CAPACITY_INCREMENT = 12; 336 337 // Used to draw cached views 338 private final Paint mCachePaint = new Paint(); 339 340 // Used to animate add/remove changes in layout 341 private LayoutTransition mTransition; 342 343 // The set of views that are currently being transitioned. This list is used to track views 344 // being removed that should not actually be removed from the parent yet because they are 345 // being animated. 346 private ArrayList<View> mTransitioningViews; 347 348 // List of children changing visibility. This is used to potentially keep rendering 349 // views during a transition when they otherwise would have become gone/invisible 350 private ArrayList<View> mVisibilityChangingChildren; 351 352 // Indicates whether this container will use its children layers to draw 353 @ViewDebug.ExportedProperty(category = "drawing") 354 private boolean mDrawLayers = true; 355 356 public ViewGroup(Context context) { 357 super(context); 358 initViewGroup(); 359 } 360 361 public ViewGroup(Context context, AttributeSet attrs) { 362 super(context, attrs); 363 initViewGroup(); 364 initFromAttributes(context, attrs); 365 } 366 367 public ViewGroup(Context context, AttributeSet attrs, int defStyle) { 368 super(context, attrs, defStyle); 369 initViewGroup(); 370 initFromAttributes(context, attrs); 371 } 372 373 private void initViewGroup() { 374 // ViewGroup doesn't draw by default 375 setFlags(WILL_NOT_DRAW, DRAW_MASK); 376 mGroupFlags |= FLAG_CLIP_CHILDREN; 377 mGroupFlags |= FLAG_CLIP_TO_PADDING; 378 mGroupFlags |= FLAG_ANIMATION_DONE; 379 mGroupFlags |= FLAG_ANIMATION_CACHE; 380 mGroupFlags |= FLAG_ALWAYS_DRAWN_WITH_CACHE; 381 382 if (mContext.getApplicationInfo().targetSdkVersion >= Build.VERSION_CODES.HONEYCOMB) { 383 mGroupFlags |= FLAG_SPLIT_MOTION_EVENTS; 384 } 385 386 setDescendantFocusability(FOCUS_BEFORE_DESCENDANTS); 387 388 mChildren = new View[ARRAY_INITIAL_CAPACITY]; 389 mChildrenCount = 0; 390 391 mCachePaint.setDither(false); 392 393 mPersistentDrawingCache = PERSISTENT_SCROLLING_CACHE; 394 } 395 396 private void initFromAttributes(Context context, AttributeSet attrs) { 397 TypedArray a = context.obtainStyledAttributes(attrs, 398 R.styleable.ViewGroup); 399 400 final int N = a.getIndexCount(); 401 for (int i = 0; i < N; i++) { 402 int attr = a.getIndex(i); 403 switch (attr) { 404 case R.styleable.ViewGroup_clipChildren: 405 setClipChildren(a.getBoolean(attr, true)); 406 break; 407 case R.styleable.ViewGroup_clipToPadding: 408 setClipToPadding(a.getBoolean(attr, true)); 409 break; 410 case R.styleable.ViewGroup_animationCache: 411 setAnimationCacheEnabled(a.getBoolean(attr, true)); 412 break; 413 case R.styleable.ViewGroup_persistentDrawingCache: 414 setPersistentDrawingCache(a.getInt(attr, PERSISTENT_SCROLLING_CACHE)); 415 break; 416 case R.styleable.ViewGroup_addStatesFromChildren: 417 setAddStatesFromChildren(a.getBoolean(attr, false)); 418 break; 419 case R.styleable.ViewGroup_alwaysDrawnWithCache: 420 setAlwaysDrawnWithCacheEnabled(a.getBoolean(attr, true)); 421 break; 422 case R.styleable.ViewGroup_layoutAnimation: 423 int id = a.getResourceId(attr, -1); 424 if (id > 0) { 425 setLayoutAnimation(AnimationUtils.loadLayoutAnimation(mContext, id)); 426 } 427 break; 428 case R.styleable.ViewGroup_descendantFocusability: 429 setDescendantFocusability(DESCENDANT_FOCUSABILITY_FLAGS[a.getInt(attr, 0)]); 430 break; 431 case R.styleable.ViewGroup_splitMotionEvents: 432 setMotionEventSplittingEnabled(a.getBoolean(attr, false)); 433 break; 434 case R.styleable.ViewGroup_animateLayoutChanges: 435 boolean animateLayoutChanges = a.getBoolean(attr, false); 436 if (animateLayoutChanges) { 437 setLayoutTransition(new LayoutTransition()); 438 } 439 break; 440 } 441 } 442 443 a.recycle(); 444 } 445 446 /** 447 * Gets the descendant focusability of this view group. The descendant 448 * focusability defines the relationship between this view group and its 449 * descendants when looking for a view to take focus in 450 * {@link #requestFocus(int, android.graphics.Rect)}. 451 * 452 * @return one of {@link #FOCUS_BEFORE_DESCENDANTS}, {@link #FOCUS_AFTER_DESCENDANTS}, 453 * {@link #FOCUS_BLOCK_DESCENDANTS}. 454 */ 455 @ViewDebug.ExportedProperty(category = "focus", mapping = { 456 @ViewDebug.IntToString(from = FOCUS_BEFORE_DESCENDANTS, to = "FOCUS_BEFORE_DESCENDANTS"), 457 @ViewDebug.IntToString(from = FOCUS_AFTER_DESCENDANTS, to = "FOCUS_AFTER_DESCENDANTS"), 458 @ViewDebug.IntToString(from = FOCUS_BLOCK_DESCENDANTS, to = "FOCUS_BLOCK_DESCENDANTS") 459 }) 460 public int getDescendantFocusability() { 461 return mGroupFlags & FLAG_MASK_FOCUSABILITY; 462 } 463 464 /** 465 * Set the descendant focusability of this view group. This defines the relationship 466 * between this view group and its descendants when looking for a view to 467 * take focus in {@link #requestFocus(int, android.graphics.Rect)}. 468 * 469 * @param focusability one of {@link #FOCUS_BEFORE_DESCENDANTS}, {@link #FOCUS_AFTER_DESCENDANTS}, 470 * {@link #FOCUS_BLOCK_DESCENDANTS}. 471 */ 472 public void setDescendantFocusability(int focusability) { 473 switch (focusability) { 474 case FOCUS_BEFORE_DESCENDANTS: 475 case FOCUS_AFTER_DESCENDANTS: 476 case FOCUS_BLOCK_DESCENDANTS: 477 break; 478 default: 479 throw new IllegalArgumentException("must be one of FOCUS_BEFORE_DESCENDANTS, " 480 + "FOCUS_AFTER_DESCENDANTS, FOCUS_BLOCK_DESCENDANTS"); 481 } 482 mGroupFlags &= ~FLAG_MASK_FOCUSABILITY; 483 mGroupFlags |= (focusability & FLAG_MASK_FOCUSABILITY); 484 } 485 486 /** 487 * {@inheritDoc} 488 */ 489 @Override 490 void handleFocusGainInternal(int direction, Rect previouslyFocusedRect) { 491 if (mFocused != null) { 492 mFocused.unFocus(); 493 mFocused = null; 494 } 495 super.handleFocusGainInternal(direction, previouslyFocusedRect); 496 } 497 498 /** 499 * {@inheritDoc} 500 */ 501 public void requestChildFocus(View child, View focused) { 502 if (DBG) { 503 System.out.println(this + " requestChildFocus()"); 504 } 505 if (getDescendantFocusability() == FOCUS_BLOCK_DESCENDANTS) { 506 return; 507 } 508 509 // Unfocus us, if necessary 510 super.unFocus(); 511 512 // We had a previous notion of who had focus. Clear it. 513 if (mFocused != child) { 514 if (mFocused != null) { 515 mFocused.unFocus(); 516 } 517 518 mFocused = child; 519 } 520 if (mParent != null) { 521 mParent.requestChildFocus(this, focused); 522 } 523 } 524 525 /** 526 * {@inheritDoc} 527 */ 528 public void focusableViewAvailable(View v) { 529 if (mParent != null 530 // shortcut: don't report a new focusable view if we block our descendants from 531 // getting focus 532 && (getDescendantFocusability() != FOCUS_BLOCK_DESCENDANTS) 533 // shortcut: don't report a new focusable view if we already are focused 534 // (and we don't prefer our descendants) 535 // 536 // note: knowing that mFocused is non-null is not a good enough reason 537 // to break the traversal since in that case we'd actually have to find 538 // the focused view and make sure it wasn't FOCUS_AFTER_DESCENDANTS and 539 // an ancestor of v; this will get checked for at ViewRoot 540 && !(isFocused() && getDescendantFocusability() != FOCUS_AFTER_DESCENDANTS)) { 541 mParent.focusableViewAvailable(v); 542 } 543 } 544 545 /** 546 * {@inheritDoc} 547 */ 548 public boolean showContextMenuForChild(View originalView) { 549 return mParent != null && mParent.showContextMenuForChild(originalView); 550 } 551 552 /** 553 * {@inheritDoc} 554 */ 555 public ActionMode startActionModeForChild(View originalView, ActionMode.Callback callback) { 556 return mParent != null ? mParent.startActionModeForChild(originalView, callback) : null; 557 } 558 559 /** 560 * Find the nearest view in the specified direction that wants to take 561 * focus. 562 * 563 * @param focused The view that currently has focus 564 * @param direction One of FOCUS_UP, FOCUS_DOWN, FOCUS_LEFT, and 565 * FOCUS_RIGHT, or 0 for not applicable. 566 */ 567 public View focusSearch(View focused, int direction) { 568 if (isRootNamespace()) { 569 // root namespace means we should consider ourselves the top of the 570 // tree for focus searching; otherwise we could be focus searching 571 // into other tabs. see LocalActivityManager and TabHost for more info 572 return FocusFinder.getInstance().findNextFocus(this, focused, direction); 573 } else if (mParent != null) { 574 return mParent.focusSearch(focused, direction); 575 } 576 return null; 577 } 578 579 /** 580 * {@inheritDoc} 581 */ 582 public boolean requestChildRectangleOnScreen(View child, Rect rectangle, boolean immediate) { 583 return false; 584 } 585 586 /** 587 * {@inheritDoc} 588 */ 589 @Override 590 public boolean dispatchUnhandledMove(View focused, int direction) { 591 return mFocused != null && 592 mFocused.dispatchUnhandledMove(focused, direction); 593 } 594 595 /** 596 * {@inheritDoc} 597 */ 598 public void clearChildFocus(View child) { 599 if (DBG) { 600 System.out.println(this + " clearChildFocus()"); 601 } 602 603 mFocused = null; 604 if (mParent != null) { 605 mParent.clearChildFocus(this); 606 } 607 } 608 609 /** 610 * {@inheritDoc} 611 */ 612 @Override 613 public void clearFocus() { 614 super.clearFocus(); 615 616 // clear any child focus if it exists 617 if (mFocused != null) { 618 mFocused.clearFocus(); 619 } 620 } 621 622 /** 623 * {@inheritDoc} 624 */ 625 @Override 626 void unFocus() { 627 if (DBG) { 628 System.out.println(this + " unFocus()"); 629 } 630 631 super.unFocus(); 632 if (mFocused != null) { 633 mFocused.unFocus(); 634 } 635 mFocused = null; 636 } 637 638 /** 639 * Returns the focused child of this view, if any. The child may have focus 640 * or contain focus. 641 * 642 * @return the focused child or null. 643 */ 644 public View getFocusedChild() { 645 return mFocused; 646 } 647 648 /** 649 * Returns true if this view has or contains focus 650 * 651 * @return true if this view has or contains focus 652 */ 653 @Override 654 public boolean hasFocus() { 655 return (mPrivateFlags & FOCUSED) != 0 || mFocused != null; 656 } 657 658 /* 659 * (non-Javadoc) 660 * 661 * @see android.view.View#findFocus() 662 */ 663 @Override 664 public View findFocus() { 665 if (DBG) { 666 System.out.println("Find focus in " + this + ": flags=" 667 + isFocused() + ", child=" + mFocused); 668 } 669 670 if (isFocused()) { 671 return this; 672 } 673 674 if (mFocused != null) { 675 return mFocused.findFocus(); 676 } 677 return null; 678 } 679 680 /** 681 * {@inheritDoc} 682 */ 683 @Override 684 public boolean hasFocusable() { 685 if ((mViewFlags & VISIBILITY_MASK) != VISIBLE) { 686 return false; 687 } 688 689 if (isFocusable()) { 690 return true; 691 } 692 693 final int descendantFocusability = getDescendantFocusability(); 694 if (descendantFocusability != FOCUS_BLOCK_DESCENDANTS) { 695 final int count = mChildrenCount; 696 final View[] children = mChildren; 697 698 for (int i = 0; i < count; i++) { 699 final View child = children[i]; 700 if (child.hasFocusable()) { 701 return true; 702 } 703 } 704 } 705 706 return false; 707 } 708 709 /** 710 * {@inheritDoc} 711 */ 712 @Override 713 public void addFocusables(ArrayList<View> views, int direction) { 714 addFocusables(views, direction, FOCUSABLES_TOUCH_MODE); 715 } 716 717 /** 718 * {@inheritDoc} 719 */ 720 @Override 721 public void addFocusables(ArrayList<View> views, int direction, int focusableMode) { 722 final int focusableCount = views.size(); 723 724 final int descendantFocusability = getDescendantFocusability(); 725 726 if (descendantFocusability != FOCUS_BLOCK_DESCENDANTS) { 727 final int count = mChildrenCount; 728 final View[] children = mChildren; 729 730 for (int i = 0; i < count; i++) { 731 final View child = children[i]; 732 if ((child.mViewFlags & VISIBILITY_MASK) == VISIBLE) { 733 child.addFocusables(views, direction, focusableMode); 734 } 735 } 736 } 737 738 // we add ourselves (if focusable) in all cases except for when we are 739 // FOCUS_AFTER_DESCENDANTS and there are some descendants focusable. this is 740 // to avoid the focus search finding layouts when a more precise search 741 // among the focusable children would be more interesting. 742 if ( 743 descendantFocusability != FOCUS_AFTER_DESCENDANTS || 744 // No focusable descendants 745 (focusableCount == views.size())) { 746 super.addFocusables(views, direction, focusableMode); 747 } 748 } 749 750 /** 751 * {@inheritDoc} 752 */ 753 @Override 754 public void dispatchWindowFocusChanged(boolean hasFocus) { 755 super.dispatchWindowFocusChanged(hasFocus); 756 final int count = mChildrenCount; 757 final View[] children = mChildren; 758 for (int i = 0; i < count; i++) { 759 children[i].dispatchWindowFocusChanged(hasFocus); 760 } 761 } 762 763 /** 764 * {@inheritDoc} 765 */ 766 @Override 767 public void addTouchables(ArrayList<View> views) { 768 super.addTouchables(views); 769 770 final int count = mChildrenCount; 771 final View[] children = mChildren; 772 773 for (int i = 0; i < count; i++) { 774 final View child = children[i]; 775 if ((child.mViewFlags & VISIBILITY_MASK) == VISIBLE) { 776 child.addTouchables(views); 777 } 778 } 779 } 780 781 /** 782 * {@inheritDoc} 783 */ 784 @Override 785 public void dispatchDisplayHint(int hint) { 786 super.dispatchDisplayHint(hint); 787 final int count = mChildrenCount; 788 final View[] children = mChildren; 789 for (int i = 0; i < count; i++) { 790 children[i].dispatchDisplayHint(hint); 791 } 792 } 793 794 /** 795 * @hide 796 * @param child 797 * @param visibility 798 */ 799 void onChildVisibilityChanged(View child, int visibility) { 800 if (mTransition != null) { 801 if (visibility == VISIBLE) { 802 mTransition.showChild(this, child); 803 } else { 804 mTransition.hideChild(this, child); 805 } 806 if (visibility != VISIBLE) { 807 // Only track this on disappearing views - appearing views are already visible 808 // and don't need special handling during drawChild() 809 if (mVisibilityChangingChildren == null) { 810 mVisibilityChangingChildren = new ArrayList<View>(); 811 } 812 mVisibilityChangingChildren.add(child); 813 if (mTransitioningViews != null && mTransitioningViews.contains(child)) { 814 addDisappearingView(child); 815 } 816 } 817 } 818 819 // in all cases, for drags 820 if (mCurrentDrag != null) { 821 if (visibility == VISIBLE) { 822 notifyChildOfDrag(child); 823 } 824 } 825 } 826 827 /** 828 * {@inheritDoc} 829 */ 830 @Override 831 protected void dispatchVisibilityChanged(View changedView, int visibility) { 832 super.dispatchVisibilityChanged(changedView, visibility); 833 final int count = mChildrenCount; 834 final View[] children = mChildren; 835 for (int i = 0; i < count; i++) { 836 children[i].dispatchVisibilityChanged(changedView, visibility); 837 } 838 } 839 840 /** 841 * {@inheritDoc} 842 */ 843 @Override 844 public void dispatchWindowVisibilityChanged(int visibility) { 845 super.dispatchWindowVisibilityChanged(visibility); 846 final int count = mChildrenCount; 847 final View[] children = mChildren; 848 for (int i = 0; i < count; i++) { 849 children[i].dispatchWindowVisibilityChanged(visibility); 850 } 851 } 852 853 /** 854 * {@inheritDoc} 855 */ 856 @Override 857 public void dispatchConfigurationChanged(Configuration newConfig) { 858 super.dispatchConfigurationChanged(newConfig); 859 final int count = mChildrenCount; 860 final View[] children = mChildren; 861 for (int i = 0; i < count; i++) { 862 children[i].dispatchConfigurationChanged(newConfig); 863 } 864 } 865 866 /** 867 * {@inheritDoc} 868 */ 869 public void recomputeViewAttributes(View child) { 870 if (mAttachInfo != null && !mAttachInfo.mRecomputeGlobalAttributes) { 871 ViewParent parent = mParent; 872 if (parent != null) parent.recomputeViewAttributes(this); 873 } 874 } 875 876 @Override 877 void dispatchCollectViewAttributes(int visibility) { 878 visibility |= mViewFlags&VISIBILITY_MASK; 879 super.dispatchCollectViewAttributes(visibility); 880 final int count = mChildrenCount; 881 final View[] children = mChildren; 882 for (int i = 0; i < count; i++) { 883 children[i].dispatchCollectViewAttributes(visibility); 884 } 885 } 886 887 /** 888 * {@inheritDoc} 889 */ 890 public void bringChildToFront(View child) { 891 int index = indexOfChild(child); 892 if (index >= 0) { 893 removeFromArray(index); 894 addInArray(child, mChildrenCount); 895 child.mParent = this; 896 } 897 } 898 899 /** 900 * {@inheritDoc} 901 * 902 * !!! TODO: write real docs 903 */ 904 @Override 905 public boolean dispatchDragEvent(DragEvent event) { 906 boolean retval = false; 907 final float tx = event.mX; 908 final float ty = event.mY; 909 910 ViewRoot root = getViewRoot(); 911 912 // Dispatch down the view hierarchy 913 switch (event.mAction) { 914 case DragEvent.ACTION_DRAG_STARTED: { 915 // clear state to recalculate which views we drag over 916 mCurrentDragView = null; 917 918 // Set up our tracking of drag-started notifications 919 mCurrentDrag = DragEvent.obtain(event); 920 if (mDragNotifiedChildren == null) { 921 mDragNotifiedChildren = new HashSet<View>(); 922 } else { 923 mDragNotifiedChildren.clear(); 924 } 925 926 // Now dispatch down to our children, caching the responses 927 mChildAcceptsDrag = false; 928 final int count = mChildrenCount; 929 final View[] children = mChildren; 930 for (int i = 0; i < count; i++) { 931 final View child = children[i]; 932 child.mPrivateFlags2 &= ~View.DRAG_MASK; 933 if (child.getVisibility() == VISIBLE) { 934 final boolean handled = notifyChildOfDrag(children[i]); 935 if (handled) { 936 mChildAcceptsDrag = true; 937 } 938 } 939 } 940 941 // Return HANDLED if one of our children can accept the drag 942 if (mChildAcceptsDrag) { 943 retval = true; 944 } 945 } break; 946 947 case DragEvent.ACTION_DRAG_ENDED: { 948 // Release the bookkeeping now that the drag lifecycle has ended 949 if (mDragNotifiedChildren != null) { 950 for (View child : mDragNotifiedChildren) { 951 // If a child was notified about an ongoing drag, it's told that it's over 952 child.dispatchDragEvent(event); 953 child.mPrivateFlags2 &= ~View.DRAG_MASK; 954 child.refreshDrawableState(); 955 } 956 957 mDragNotifiedChildren.clear(); 958 mCurrentDrag.recycle(); 959 mCurrentDrag = null; 960 } 961 962 // We consider drag-ended to have been handled if one of our children 963 // had offered to handle the drag. 964 if (mChildAcceptsDrag) { 965 retval = true; 966 } 967 } break; 968 969 case DragEvent.ACTION_DRAG_LOCATION: { 970 // Find the [possibly new] drag target 971 final View target = findFrontmostDroppableChildAt(event.mX, event.mY, mLocalPoint); 972 973 // If we've changed apparent drag target, tell the view root which view 974 // we're over now [for purposes of the eventual drag-recipient-changed 975 // notifications to the framework] and tell the new target that the drag 976 // has entered its bounds. The root will see setDragFocus() calls all 977 // the way down to the final leaf view that is handling the LOCATION event 978 // before reporting the new potential recipient to the framework. 979 if (mCurrentDragView != target) { 980 root.setDragFocus(target); 981 982 final int action = event.mAction; 983 // If we've dragged off of a child view, send it the EXITED message 984 if (mCurrentDragView != null) { 985 final View view = mCurrentDragView; 986 event.mAction = DragEvent.ACTION_DRAG_EXITED; 987 view.dispatchDragEvent(event); 988 view.mPrivateFlags2 &= ~View.DRAG_HOVERED; 989 view.refreshDrawableState(); 990 } 991 mCurrentDragView = target; 992 993 // If we've dragged over a new child view, send it the ENTERED message 994 if (target != null) { 995 event.mAction = DragEvent.ACTION_DRAG_ENTERED; 996 target.dispatchDragEvent(event); 997 target.mPrivateFlags2 |= View.DRAG_HOVERED; 998 target.refreshDrawableState(); 999 } 1000 event.mAction = action; // restore the event's original state 1001 } 1002 1003 // Dispatch the actual drag location notice, localized into its coordinates 1004 if (target != null) { 1005 event.mX = mLocalPoint.x; 1006 event.mY = mLocalPoint.y; 1007 1008 retval = target.dispatchDragEvent(event); 1009 1010 event.mX = tx; 1011 event.mY = ty; 1012 } 1013 } break; 1014 1015 /* Entered / exited dispatch 1016 * 1017 * DRAG_ENTERED is not dispatched downwards from ViewGroup. The reason for this is 1018 * that we're about to get the corresponding LOCATION event, which we will use to 1019 * determine which of our children is the new target; at that point we will 1020 * push a DRAG_ENTERED down to the new target child [which may itself be a ViewGroup]. 1021 * 1022 * DRAG_EXITED *is* dispatched all the way down immediately: once we know the 1023 * drag has left this ViewGroup, we know by definition that every contained subview 1024 * is also no longer under the drag point. 1025 */ 1026 1027 case DragEvent.ACTION_DRAG_EXITED: { 1028 if (mCurrentDragView != null) { 1029 final View view = mCurrentDragView; 1030 view.dispatchDragEvent(event); 1031 view.mPrivateFlags2 &= ~View.DRAG_HOVERED; 1032 view.refreshDrawableState(); 1033 1034 mCurrentDragView = null; 1035 } 1036 } break; 1037 1038 case DragEvent.ACTION_DROP: { 1039 if (ViewDebug.DEBUG_DRAG) Log.d(View.VIEW_LOG_TAG, "Drop event: " + event); 1040 View target = findFrontmostDroppableChildAt(event.mX, event.mY, mLocalPoint); 1041 if (target != null) { 1042 if (ViewDebug.DEBUG_DRAG) Log.d(View.VIEW_LOG_TAG, " dispatch drop to " + target); 1043 event.mX = mLocalPoint.x; 1044 event.mY = mLocalPoint.y; 1045 retval = target.dispatchDragEvent(event); 1046 event.mX = tx; 1047 event.mY = ty; 1048 } else { 1049 if (ViewDebug.DEBUG_DRAG) { 1050 Log.d(View.VIEW_LOG_TAG, " not dropped on an accepting view"); 1051 } 1052 } 1053 } break; 1054 } 1055 1056 // If none of our children could handle the event, try here 1057 if (!retval) { 1058 // Call up to the View implementation that dispatches to installed listeners 1059 retval = super.dispatchDragEvent(event); 1060 } 1061 return retval; 1062 } 1063 1064 // Find the frontmost child view that lies under the given point, and calculate 1065 // the position within its own local coordinate system. 1066 View findFrontmostDroppableChildAt(float x, float y, PointF outLocalPoint) { 1067 final int count = mChildrenCount; 1068 final View[] children = mChildren; 1069 for (int i = count - 1; i >= 0; i--) { 1070 final View child = children[i]; 1071 if (!child.canAcceptDrag()) { 1072 continue; 1073 } 1074 1075 if (isTransformedTouchPointInView(x, y, child, outLocalPoint)) { 1076 return child; 1077 } 1078 } 1079 return null; 1080 } 1081 1082 boolean notifyChildOfDrag(View child) { 1083 if (ViewDebug.DEBUG_DRAG) { 1084 Log.d(View.VIEW_LOG_TAG, "Sending drag-started to view: " + child); 1085 } 1086 1087 boolean canAccept = false; 1088 if (! mDragNotifiedChildren.contains(child)) { 1089 mDragNotifiedChildren.add(child); 1090 canAccept = child.dispatchDragEvent(mCurrentDrag); 1091 if (canAccept && !child.canAcceptDrag()) { 1092 child.mPrivateFlags2 |= View.DRAG_CAN_ACCEPT; 1093 child.refreshDrawableState(); 1094 } 1095 } 1096 return canAccept; 1097 } 1098 1099 @Override 1100 public void dispatchSystemUiVisibilityChanged(int visible) { 1101 super.dispatchSystemUiVisibilityChanged(visible); 1102 1103 final int count = mChildrenCount; 1104 final View[] children = mChildren; 1105 for (int i=0; i <count; i++) { 1106 final View child = children[i]; 1107 child.dispatchSystemUiVisibilityChanged(visible); 1108 } 1109 } 1110 1111 /** 1112 * {@inheritDoc} 1113 */ 1114 @Override 1115 public boolean dispatchKeyEventPreIme(KeyEvent event) { 1116 if ((mPrivateFlags & (FOCUSED | HAS_BOUNDS)) == (FOCUSED | HAS_BOUNDS)) { 1117 return super.dispatchKeyEventPreIme(event); 1118 } else if (mFocused != null && (mFocused.mPrivateFlags & HAS_BOUNDS) == HAS_BOUNDS) { 1119 return mFocused.dispatchKeyEventPreIme(event); 1120 } 1121 return false; 1122 } 1123 1124 /** 1125 * {@inheritDoc} 1126 */ 1127 @Override 1128 public boolean dispatchKeyEvent(KeyEvent event) { 1129 if (mInputEventConsistencyVerifier != null) { 1130 mInputEventConsistencyVerifier.onKeyEvent(event, 1); 1131 } 1132 1133 if ((mPrivateFlags & (FOCUSED | HAS_BOUNDS)) == (FOCUSED | HAS_BOUNDS)) { 1134 if (super.dispatchKeyEvent(event)) { 1135 return true; 1136 } 1137 } else if (mFocused != null && (mFocused.mPrivateFlags & HAS_BOUNDS) == HAS_BOUNDS) { 1138 if (mFocused.dispatchKeyEvent(event)) { 1139 return true; 1140 } 1141 } 1142 1143 if (mInputEventConsistencyVerifier != null) { 1144 mInputEventConsistencyVerifier.onUnhandledEvent(event, 1); 1145 } 1146 return false; 1147 } 1148 1149 /** 1150 * {@inheritDoc} 1151 */ 1152 @Override 1153 public boolean dispatchKeyShortcutEvent(KeyEvent event) { 1154 if ((mPrivateFlags & (FOCUSED | HAS_BOUNDS)) == (FOCUSED | HAS_BOUNDS)) { 1155 return super.dispatchKeyShortcutEvent(event); 1156 } else if (mFocused != null && (mFocused.mPrivateFlags & HAS_BOUNDS) == HAS_BOUNDS) { 1157 return mFocused.dispatchKeyShortcutEvent(event); 1158 } 1159 return false; 1160 } 1161 1162 /** 1163 * {@inheritDoc} 1164 */ 1165 @Override 1166 public boolean dispatchTrackballEvent(MotionEvent event) { 1167 if (mInputEventConsistencyVerifier != null) { 1168 mInputEventConsistencyVerifier.onTrackballEvent(event, 1); 1169 } 1170 1171 if ((mPrivateFlags & (FOCUSED | HAS_BOUNDS)) == (FOCUSED | HAS_BOUNDS)) { 1172 if (super.dispatchTrackballEvent(event)) { 1173 return true; 1174 } 1175 } else if (mFocused != null && (mFocused.mPrivateFlags & HAS_BOUNDS) == HAS_BOUNDS) { 1176 if (mFocused.dispatchTrackballEvent(event)) { 1177 return true; 1178 } 1179 } 1180 1181 if (mInputEventConsistencyVerifier != null) { 1182 mInputEventConsistencyVerifier.onUnhandledEvent(event, 1); 1183 } 1184 return false; 1185 } 1186 1187 /** @hide */ 1188 @Override 1189 protected boolean dispatchHoverEvent(MotionEvent event) { 1190 // Send the hover enter or hover move event to the view group first. 1191 // If it handles the event then a hovered child should receive hover exit. 1192 boolean handled = false; 1193 final boolean interceptHover; 1194 final int action = event.getAction(); 1195 if (action == MotionEvent.ACTION_HOVER_EXIT) { 1196 interceptHover = true; 1197 } else { 1198 handled = super.dispatchHoverEvent(event); 1199 interceptHover = handled; 1200 } 1201 1202 // Send successive hover events to the hovered child as long as the pointer 1203 // remains within the child's bounds. 1204 MotionEvent eventNoHistory = event; 1205 if (mHoveredChild != null) { 1206 final float x = event.getX(); 1207 final float y = event.getY(); 1208 1209 if (interceptHover 1210 || !isTransformedTouchPointInView(x, y, mHoveredChild, null)) { 1211 // Pointer exited the child. 1212 // Send it a hover exit with only the most recent coordinates. We could 1213 // try to find the exact point in history when the pointer left the view 1214 // but it is not worth the effort. 1215 eventNoHistory = obtainMotionEventNoHistoryOrSelf(eventNoHistory); 1216 eventNoHistory.setAction(MotionEvent.ACTION_HOVER_EXIT); 1217 handled |= dispatchTransformedGenericPointerEvent(eventNoHistory, mHoveredChild); 1218 eventNoHistory.setAction(action); 1219 1220 mHoveredChild = null; 1221 } else if (action == MotionEvent.ACTION_HOVER_MOVE) { 1222 // Pointer is still within the child. 1223 handled |= dispatchTransformedGenericPointerEvent(event, mHoveredChild); 1224 } 1225 } 1226 1227 // Find a new hovered child if needed. 1228 if (!interceptHover && mHoveredChild == null 1229 && (action == MotionEvent.ACTION_HOVER_ENTER 1230 || action == MotionEvent.ACTION_HOVER_MOVE)) { 1231 final int childrenCount = mChildrenCount; 1232 if (childrenCount != 0) { 1233 final View[] children = mChildren; 1234 final float x = event.getX(); 1235 final float y = event.getY(); 1236 1237 for (int i = childrenCount - 1; i >= 0; i--) { 1238 final View child = children[i]; 1239 if (!canViewReceivePointerEvents(child) 1240 || !isTransformedTouchPointInView(x, y, child, null)) { 1241 continue; 1242 } 1243 1244 // Found the hovered child. 1245 mHoveredChild = child; 1246 if (action == MotionEvent.ACTION_HOVER_MOVE) { 1247 // Pointer was moving within the view group and entered the child. 1248 // Send it a hover enter and hover move with only the most recent 1249 // coordinates. We could try to find the exact point in history when 1250 // the pointer entered the view but it is not worth the effort. 1251 eventNoHistory = obtainMotionEventNoHistoryOrSelf(eventNoHistory); 1252 eventNoHistory.setAction(MotionEvent.ACTION_HOVER_ENTER); 1253 handled |= dispatchTransformedGenericPointerEvent(eventNoHistory, child); 1254 eventNoHistory.setAction(action); 1255 1256 handled |= dispatchTransformedGenericPointerEvent(eventNoHistory, child); 1257 } else { /* must be ACTION_HOVER_ENTER */ 1258 // Pointer entered the child. 1259 handled |= dispatchTransformedGenericPointerEvent(event, child); 1260 } 1261 break; 1262 } 1263 } 1264 } 1265 1266 // Recycle the copy of the event that we made. 1267 if (eventNoHistory != event) { 1268 eventNoHistory.recycle(); 1269 } 1270 1271 // Send hover exit to the view group. If there was a child, we will already have 1272 // sent the hover exit to it. 1273 if (action == MotionEvent.ACTION_HOVER_EXIT) { 1274 handled |= super.dispatchHoverEvent(event); 1275 } 1276 1277 // Done. 1278 return handled; 1279 } 1280 1281 private static MotionEvent obtainMotionEventNoHistoryOrSelf(MotionEvent event) { 1282 if (event.getHistorySize() == 0) { 1283 return event; 1284 } 1285 return MotionEvent.obtainNoHistory(event); 1286 } 1287 1288 /** @hide */ 1289 @Override 1290 protected boolean dispatchGenericPointerEvent(MotionEvent event) { 1291 // Send the event to the child under the pointer. 1292 final int childrenCount = mChildrenCount; 1293 if (childrenCount != 0) { 1294 final View[] children = mChildren; 1295 final float x = event.getX(); 1296 final float y = event.getY(); 1297 1298 for (int i = childrenCount - 1; i >= 0; i--) { 1299 final View child = children[i]; 1300 if (!canViewReceivePointerEvents(child) 1301 || !isTransformedTouchPointInView(x, y, child, null)) { 1302 continue; 1303 } 1304 1305 if (dispatchTransformedGenericPointerEvent(event, child)) { 1306 return true; 1307 } 1308 } 1309 } 1310 1311 // No child handled the event. Send it to this view group. 1312 return super.dispatchGenericPointerEvent(event); 1313 } 1314 1315 /** @hide */ 1316 @Override 1317 protected boolean dispatchGenericFocusedEvent(MotionEvent event) { 1318 // Send the event to the focused child or to this view group if it has focus. 1319 if ((mPrivateFlags & (FOCUSED | HAS_BOUNDS)) == (FOCUSED | HAS_BOUNDS)) { 1320 return super.dispatchGenericFocusedEvent(event); 1321 } else if (mFocused != null && (mFocused.mPrivateFlags & HAS_BOUNDS) == HAS_BOUNDS) { 1322 return mFocused.dispatchGenericMotionEvent(event); 1323 } 1324 return false; 1325 } 1326 1327 /** 1328 * Dispatches a generic pointer event to a child, taking into account 1329 * transformations that apply to the child. 1330 * 1331 * @param event The event to send. 1332 * @param child The view to send the event to. 1333 * @return {@code true} if the child handled the event. 1334 */ 1335 private boolean dispatchTransformedGenericPointerEvent(MotionEvent event, View child) { 1336 final float offsetX = mScrollX - child.mLeft; 1337 final float offsetY = mScrollY - child.mTop; 1338 1339 boolean handled; 1340 if (!child.hasIdentityMatrix()) { 1341 MotionEvent transformedEvent = MotionEvent.obtain(event); 1342 transformedEvent.offsetLocation(offsetX, offsetY); 1343 transformedEvent.transform(child.getInverseMatrix()); 1344 handled = child.dispatchGenericMotionEvent(transformedEvent); 1345 transformedEvent.recycle(); 1346 } else { 1347 event.offsetLocation(offsetX, offsetY); 1348 handled = child.dispatchGenericMotionEvent(event); 1349 event.offsetLocation(-offsetX, -offsetY); 1350 } 1351 return handled; 1352 } 1353 1354 /** 1355 * {@inheritDoc} 1356 */ 1357 @Override 1358 public boolean dispatchTouchEvent(MotionEvent ev) { 1359 if (mInputEventConsistencyVerifier != null) { 1360 mInputEventConsistencyVerifier.onTouchEvent(ev, 1); 1361 } 1362 1363 boolean handled = false; 1364 if (onFilterTouchEventForSecurity(ev)) { 1365 final int action = ev.getAction(); 1366 final int actionMasked = action & MotionEvent.ACTION_MASK; 1367 1368 // Handle an initial down. 1369 if (actionMasked == MotionEvent.ACTION_DOWN) { 1370 // Throw away all previous state when starting a new touch gesture. 1371 // The framework may have dropped the up or cancel event for the previous gesture 1372 // due to an app switch, ANR, or some other state change. 1373 cancelAndClearTouchTargets(ev); 1374 resetTouchState(); 1375 } 1376 1377 // Check for interception. 1378 final boolean intercepted; 1379 if (actionMasked == MotionEvent.ACTION_DOWN 1380 || mFirstTouchTarget != null) { 1381 final boolean disallowIntercept = (mGroupFlags & FLAG_DISALLOW_INTERCEPT) != 0; 1382 if (!disallowIntercept) { 1383 intercepted = onInterceptTouchEvent(ev); 1384 ev.setAction(action); // restore action in case it was changed 1385 } else { 1386 intercepted = false; 1387 } 1388 } else { 1389 // There are no touch targets and this action is not an initial down 1390 // so this view group continues to intercept touches. 1391 intercepted = true; 1392 } 1393 1394 // Check for cancelation. 1395 final boolean canceled = resetCancelNextUpFlag(this) 1396 || actionMasked == MotionEvent.ACTION_CANCEL; 1397 1398 // Update list of touch targets for pointer down, if needed. 1399 final boolean split = (mGroupFlags & FLAG_SPLIT_MOTION_EVENTS) != 0; 1400 TouchTarget newTouchTarget = null; 1401 boolean alreadyDispatchedToNewTouchTarget = false; 1402 if (!canceled && !intercepted) { 1403 if (actionMasked == MotionEvent.ACTION_DOWN 1404 || (split && actionMasked == MotionEvent.ACTION_POINTER_DOWN) 1405 || actionMasked == MotionEvent.ACTION_HOVER_MOVE) { 1406 final int actionIndex = ev.getActionIndex(); // always 0 for down 1407 final int idBitsToAssign = split ? 1 << ev.getPointerId(actionIndex) 1408 : TouchTarget.ALL_POINTER_IDS; 1409 1410 // Clean up earlier touch targets for this pointer id in case they 1411 // have become out of sync. 1412 removePointersFromTouchTargets(idBitsToAssign); 1413 1414 final int childrenCount = mChildrenCount; 1415 if (childrenCount != 0) { 1416 // Find a child that can receive the event. 1417 // Scan children from front to back. 1418 final View[] children = mChildren; 1419 final float x = ev.getX(actionIndex); 1420 final float y = ev.getY(actionIndex); 1421 1422 for (int i = childrenCount - 1; i >= 0; i--) { 1423 final View child = children[i]; 1424 if (!canViewReceivePointerEvents(child) 1425 || !isTransformedTouchPointInView(x, y, child, null)) { 1426 continue; 1427 } 1428 1429 newTouchTarget = getTouchTarget(child); 1430 if (newTouchTarget != null) { 1431 // Child is already receiving touch within its bounds. 1432 // Give it the new pointer in addition to the ones it is handling. 1433 newTouchTarget.pointerIdBits |= idBitsToAssign; 1434 break; 1435 } 1436 1437 resetCancelNextUpFlag(child); 1438 if (dispatchTransformedTouchEvent(ev, false, child, idBitsToAssign)) { 1439 // Child wants to receive touch within its bounds. 1440 mLastTouchDownTime = ev.getDownTime(); 1441 mLastTouchDownIndex = i; 1442 mLastTouchDownX = ev.getX(); 1443 mLastTouchDownY = ev.getY(); 1444 newTouchTarget = addTouchTarget(child, idBitsToAssign); 1445 alreadyDispatchedToNewTouchTarget = true; 1446 break; 1447 } 1448 } 1449 } 1450 1451 if (newTouchTarget == null && mFirstTouchTarget != null) { 1452 // Did not find a child to receive the event. 1453 // Assign the pointer to the least recently added target. 1454 newTouchTarget = mFirstTouchTarget; 1455 while (newTouchTarget.next != null) { 1456 newTouchTarget = newTouchTarget.next; 1457 } 1458 newTouchTarget.pointerIdBits |= idBitsToAssign; 1459 } 1460 } 1461 } 1462 1463 // Dispatch to touch targets. 1464 if (mFirstTouchTarget == null) { 1465 // No touch targets so treat this as an ordinary view. 1466 handled = dispatchTransformedTouchEvent(ev, canceled, null, 1467 TouchTarget.ALL_POINTER_IDS); 1468 } else { 1469 // Dispatch to touch targets, excluding the new touch target if we already 1470 // dispatched to it. Cancel touch targets if necessary. 1471 TouchTarget predecessor = null; 1472 TouchTarget target = mFirstTouchTarget; 1473 while (target != null) { 1474 final TouchTarget next = target.next; 1475 if (alreadyDispatchedToNewTouchTarget && target == newTouchTarget) { 1476 handled = true; 1477 } else { 1478 final boolean cancelChild = resetCancelNextUpFlag(target.child) 1479 || intercepted; 1480 if (dispatchTransformedTouchEvent(ev, cancelChild, 1481 target.child, target.pointerIdBits)) { 1482 handled = true; 1483 } 1484 if (cancelChild) { 1485 if (predecessor == null) { 1486 mFirstTouchTarget = next; 1487 } else { 1488 predecessor.next = next; 1489 } 1490 target.recycle(); 1491 target = next; 1492 continue; 1493 } 1494 } 1495 predecessor = target; 1496 target = next; 1497 } 1498 } 1499 1500 // Update list of touch targets for pointer up or cancel, if needed. 1501 if (canceled 1502 || actionMasked == MotionEvent.ACTION_UP 1503 || actionMasked == MotionEvent.ACTION_HOVER_MOVE) { 1504 resetTouchState(); 1505 } else if (split && actionMasked == MotionEvent.ACTION_POINTER_UP) { 1506 final int actionIndex = ev.getActionIndex(); 1507 final int idBitsToRemove = 1 << ev.getPointerId(actionIndex); 1508 removePointersFromTouchTargets(idBitsToRemove); 1509 } 1510 } 1511 1512 if (!handled && mInputEventConsistencyVerifier != null) { 1513 mInputEventConsistencyVerifier.onUnhandledEvent(ev, 1); 1514 } 1515 return handled; 1516 } 1517 1518 /** 1519 * Resets all touch state in preparation for a new cycle. 1520 */ 1521 private void resetTouchState() { 1522 clearTouchTargets(); 1523 resetCancelNextUpFlag(this); 1524 mGroupFlags &= ~FLAG_DISALLOW_INTERCEPT; 1525 } 1526 1527 /** 1528 * Resets the cancel next up flag. 1529 * Returns true if the flag was previously set. 1530 */ 1531 private boolean resetCancelNextUpFlag(View view) { 1532 if ((view.mPrivateFlags & CANCEL_NEXT_UP_EVENT) != 0) { 1533 view.mPrivateFlags &= ~CANCEL_NEXT_UP_EVENT; 1534 return true; 1535 } 1536 return false; 1537 } 1538 1539 /** 1540 * Clears all touch targets. 1541 */ 1542 private void clearTouchTargets() { 1543 TouchTarget target = mFirstTouchTarget; 1544 if (target != null) { 1545 do { 1546 TouchTarget next = target.next; 1547 target.recycle(); 1548 target = next; 1549 } while (target != null); 1550 mFirstTouchTarget = null; 1551 } 1552 } 1553 1554 /** 1555 * Cancels and clears all touch targets. 1556 */ 1557 private void cancelAndClearTouchTargets(MotionEvent event) { 1558 if (mFirstTouchTarget != null) { 1559 boolean syntheticEvent = false; 1560 if (event == null) { 1561 final long now = SystemClock.uptimeMillis(); 1562 event = MotionEvent.obtain(now, now, 1563 MotionEvent.ACTION_CANCEL, 0.0f, 0.0f, 0); 1564 syntheticEvent = true; 1565 } 1566 1567 for (TouchTarget target = mFirstTouchTarget; target != null; target = target.next) { 1568 resetCancelNextUpFlag(target.child); 1569 dispatchTransformedTouchEvent(event, true, target.child, target.pointerIdBits); 1570 } 1571 clearTouchTargets(); 1572 1573 if (syntheticEvent) { 1574 event.recycle(); 1575 } 1576 } 1577 } 1578 1579 /** 1580 * Gets the touch target for specified child view. 1581 * Returns null if not found. 1582 */ 1583 private TouchTarget getTouchTarget(View child) { 1584 for (TouchTarget target = mFirstTouchTarget; target != null; target = target.next) { 1585 if (target.child == child) { 1586 return target; 1587 } 1588 } 1589 return null; 1590 } 1591 1592 /** 1593 * Adds a touch target for specified child to the beginning of the list. 1594 * Assumes the target child is not already present. 1595 */ 1596 private TouchTarget addTouchTarget(View child, int pointerIdBits) { 1597 TouchTarget target = TouchTarget.obtain(child, pointerIdBits); 1598 target.next = mFirstTouchTarget; 1599 mFirstTouchTarget = target; 1600 return target; 1601 } 1602 1603 /** 1604 * Removes the pointer ids from consideration. 1605 */ 1606 private void removePointersFromTouchTargets(int pointerIdBits) { 1607 TouchTarget predecessor = null; 1608 TouchTarget target = mFirstTouchTarget; 1609 while (target != null) { 1610 final TouchTarget next = target.next; 1611 if ((target.pointerIdBits & pointerIdBits) != 0) { 1612 target.pointerIdBits &= ~pointerIdBits; 1613 if (target.pointerIdBits == 0) { 1614 if (predecessor == null) { 1615 mFirstTouchTarget = next; 1616 } else { 1617 predecessor.next = next; 1618 } 1619 target.recycle(); 1620 target = next; 1621 continue; 1622 } 1623 } 1624 predecessor = target; 1625 target = next; 1626 } 1627 } 1628 1629 /** 1630 * Returns true if a child view can receive pointer events. 1631 * @hide 1632 */ 1633 private static boolean canViewReceivePointerEvents(View child) { 1634 return (child.mViewFlags & VISIBILITY_MASK) == VISIBLE 1635 || child.getAnimation() != null; 1636 } 1637 1638 /** 1639 * Returns true if a child view contains the specified point when transformed 1640 * into its coordinate space. 1641 * Child must not be null. 1642 * @hide 1643 */ 1644 protected boolean isTransformedTouchPointInView(float x, float y, View child, 1645 PointF outLocalPoint) { 1646 float localX = x + mScrollX - child.mLeft; 1647 float localY = y + mScrollY - child.mTop; 1648 if (! child.hasIdentityMatrix() && mAttachInfo != null) { 1649 final float[] localXY = mAttachInfo.mTmpTransformLocation; 1650 localXY[0] = localX; 1651 localXY[1] = localY; 1652 child.getInverseMatrix().mapPoints(localXY); 1653 localX = localXY[0]; 1654 localY = localXY[1]; 1655 } 1656 final boolean isInView = child.pointInView(localX, localY); 1657 if (isInView && outLocalPoint != null) { 1658 outLocalPoint.set(localX, localY); 1659 } 1660 return isInView; 1661 } 1662 1663 /** 1664 * Transforms a motion event into the coordinate space of a particular child view, 1665 * filters out irrelevant pointer ids, and overrides its action if necessary. 1666 * If child is null, assumes the MotionEvent will be sent to this ViewGroup instead. 1667 */ 1668 private boolean dispatchTransformedTouchEvent(MotionEvent event, boolean cancel, 1669 View child, int desiredPointerIdBits) { 1670 final boolean handled; 1671 1672 // Canceling motions is a special case. We don't need to perform any transformations 1673 // or filtering. The important part is the action, not the contents. 1674 final int oldAction = event.getAction(); 1675 if (cancel || oldAction == MotionEvent.ACTION_CANCEL) { 1676 event.setAction(MotionEvent.ACTION_CANCEL); 1677 if (child == null) { 1678 handled = super.dispatchTouchEvent(event); 1679 } else { 1680 handled = child.dispatchTouchEvent(event); 1681 } 1682 event.setAction(oldAction); 1683 return handled; 1684 } 1685 1686 // Calculate the number of pointers to deliver. 1687 final int oldPointerCount = event.getPointerCount(); 1688 int newPointerCount = 0; 1689 if (desiredPointerIdBits == TouchTarget.ALL_POINTER_IDS) { 1690 newPointerCount = oldPointerCount; 1691 } else { 1692 for (int i = 0; i < oldPointerCount; i++) { 1693 final int pointerId = event.getPointerId(i); 1694 final int pointerIdBit = 1 << pointerId; 1695 if ((pointerIdBit & desiredPointerIdBits) != 0) { 1696 newPointerCount += 1; 1697 } 1698 } 1699 } 1700 1701 // If for some reason we ended up in an inconsistent state where it looks like we 1702 // might produce a motion event with no pointers in it, then drop the event. 1703 if (newPointerCount == 0) { 1704 return false; 1705 } 1706 1707 // If the number of pointers is the same and we don't need to perform any fancy 1708 // irreversible transformations, then we can reuse the motion event for this 1709 // dispatch as long as we are careful to revert any changes we make. 1710 final boolean reuse = newPointerCount == oldPointerCount 1711 && (child == null || child.hasIdentityMatrix()); 1712 if (reuse) { 1713 if (child == null) { 1714 handled = super.dispatchTouchEvent(event); 1715 } else { 1716 final float offsetX = mScrollX - child.mLeft; 1717 final float offsetY = mScrollY - child.mTop; 1718 event.offsetLocation(offsetX, offsetY); 1719 1720 handled = child.dispatchTouchEvent(event); 1721 1722 event.offsetLocation(-offsetX, -offsetY); 1723 } 1724 return handled; 1725 } 1726 1727 // Make a copy of the event. 1728 // If the number of pointers is different, then we need to filter out irrelevant pointers 1729 // as we make a copy of the motion event. 1730 MotionEvent transformedEvent; 1731 if (newPointerCount == oldPointerCount) { 1732 transformedEvent = MotionEvent.obtain(event); 1733 } else { 1734 growTmpPointerArrays(newPointerCount); 1735 final int[] newPointerIndexMap = mTmpPointerIndexMap; 1736 final int[] newPointerIds = mTmpPointerIds; 1737 final MotionEvent.PointerCoords[] newPointerCoords = mTmpPointerCoords; 1738 1739 int newPointerIndex = 0; 1740 int oldPointerIndex = 0; 1741 while (newPointerIndex < newPointerCount) { 1742 final int pointerId = event.getPointerId(oldPointerIndex); 1743 final int pointerIdBits = 1 << pointerId; 1744 if ((pointerIdBits & desiredPointerIdBits) != 0) { 1745 newPointerIndexMap[newPointerIndex] = oldPointerIndex; 1746 newPointerIds[newPointerIndex] = pointerId; 1747 if (newPointerCoords[newPointerIndex] == null) { 1748 newPointerCoords[newPointerIndex] = new MotionEvent.PointerCoords(); 1749 } 1750 1751 newPointerIndex += 1; 1752 } 1753 oldPointerIndex += 1; 1754 } 1755 1756 final int newAction; 1757 if (cancel) { 1758 newAction = MotionEvent.ACTION_CANCEL; 1759 } else { 1760 final int oldMaskedAction = oldAction & MotionEvent.ACTION_MASK; 1761 if (oldMaskedAction == MotionEvent.ACTION_POINTER_DOWN 1762 || oldMaskedAction == MotionEvent.ACTION_POINTER_UP) { 1763 final int changedPointerId = event.getPointerId( 1764 (oldAction & MotionEvent.ACTION_POINTER_INDEX_MASK) 1765 >> MotionEvent.ACTION_POINTER_INDEX_SHIFT); 1766 final int changedPointerIdBits = 1 << changedPointerId; 1767 if ((changedPointerIdBits & desiredPointerIdBits) != 0) { 1768 if (newPointerCount == 1) { 1769 // The first/last pointer went down/up. 1770 newAction = oldMaskedAction == MotionEvent.ACTION_POINTER_DOWN 1771 ? MotionEvent.ACTION_DOWN : MotionEvent.ACTION_UP; 1772 } else { 1773 // A secondary pointer went down/up. 1774 int newChangedPointerIndex = 0; 1775 while (newPointerIds[newChangedPointerIndex] != changedPointerId) { 1776 newChangedPointerIndex += 1; 1777 } 1778 newAction = oldMaskedAction | (newChangedPointerIndex 1779 << MotionEvent.ACTION_POINTER_INDEX_SHIFT); 1780 } 1781 } else { 1782 // An unrelated pointer changed. 1783 newAction = MotionEvent.ACTION_MOVE; 1784 } 1785 } else { 1786 // Simple up/down/cancel/move motion action. 1787 newAction = oldMaskedAction; 1788 } 1789 } 1790 1791 transformedEvent = null; 1792 final int historySize = event.getHistorySize(); 1793 for (int historyIndex = 0; historyIndex <= historySize; historyIndex++) { 1794 for (newPointerIndex = 0; newPointerIndex < newPointerCount; newPointerIndex++) { 1795 final MotionEvent.PointerCoords c = newPointerCoords[newPointerIndex]; 1796 oldPointerIndex = newPointerIndexMap[newPointerIndex]; 1797 if (historyIndex != historySize) { 1798 event.getHistoricalPointerCoords(oldPointerIndex, historyIndex, c); 1799 } else { 1800 event.getPointerCoords(oldPointerIndex, c); 1801 } 1802 } 1803 1804 final long eventTime; 1805 if (historyIndex != historySize) { 1806 eventTime = event.getHistoricalEventTime(historyIndex); 1807 } else { 1808 eventTime = event.getEventTime(); 1809 } 1810 1811 if (transformedEvent == null) { 1812 transformedEvent = MotionEvent.obtain( 1813 event.getDownTime(), eventTime, newAction, 1814 newPointerCount, newPointerIds, newPointerCoords, 1815 event.getMetaState(), event.getXPrecision(), event.getYPrecision(), 1816 event.getDeviceId(), event.getEdgeFlags(), event.getSource(), 1817 event.getFlags()); 1818 } else { 1819 transformedEvent.addBatch(eventTime, newPointerCoords, 0); 1820 } 1821 } 1822 } 1823 1824 // Perform any necessary transformations and dispatch. 1825 if (child == null) { 1826 handled = super.dispatchTouchEvent(transformedEvent); 1827 } else { 1828 final float offsetX = mScrollX - child.mLeft; 1829 final float offsetY = mScrollY - child.mTop; 1830 transformedEvent.offsetLocation(offsetX, offsetY); 1831 if (! child.hasIdentityMatrix()) { 1832 transformedEvent.transform(child.getInverseMatrix()); 1833 } 1834 1835 handled = child.dispatchTouchEvent(transformedEvent); 1836 } 1837 1838 // Done. 1839 transformedEvent.recycle(); 1840 return handled; 1841 } 1842 1843 /** 1844 * Enlarge the temporary pointer arrays for splitting pointers. 1845 * May discard contents (but keeps PointerCoords objects to avoid reallocating them). 1846 */ 1847 private void growTmpPointerArrays(int desiredCapacity) { 1848 final MotionEvent.PointerCoords[] oldTmpPointerCoords = mTmpPointerCoords; 1849 int capacity; 1850 if (oldTmpPointerCoords != null) { 1851 capacity = oldTmpPointerCoords.length; 1852 if (desiredCapacity <= capacity) { 1853 return; 1854 } 1855 } else { 1856 capacity = 4; 1857 } 1858 1859 while (capacity < desiredCapacity) { 1860 capacity *= 2; 1861 } 1862 1863 mTmpPointerIndexMap = new int[capacity]; 1864 mTmpPointerIds = new int[capacity]; 1865 mTmpPointerCoords = new MotionEvent.PointerCoords[capacity]; 1866 1867 if (oldTmpPointerCoords != null) { 1868 System.arraycopy(oldTmpPointerCoords, 0, mTmpPointerCoords, 0, 1869 oldTmpPointerCoords.length); 1870 } 1871 } 1872 1873 /** 1874 * Enable or disable the splitting of MotionEvents to multiple children during touch event 1875 * dispatch. This behavior is enabled by default for applications that target an 1876 * SDK version of {@link Build.VERSION_CODES#HONEYCOMB} or newer. 1877 * 1878 * <p>When this option is enabled MotionEvents may be split and dispatched to different child 1879 * views depending on where each pointer initially went down. This allows for user interactions 1880 * such as scrolling two panes of content independently, chording of buttons, and performing 1881 * independent gestures on different pieces of content. 1882 * 1883 * @param split <code>true</code> to allow MotionEvents to be split and dispatched to multiple 1884 * child views. <code>false</code> to only allow one child view to be the target of 1885 * any MotionEvent received by this ViewGroup. 1886 */ 1887 public void setMotionEventSplittingEnabled(boolean split) { 1888 // TODO Applications really shouldn't change this setting mid-touch event, 1889 // but perhaps this should handle that case and send ACTION_CANCELs to any child views 1890 // with gestures in progress when this is changed. 1891 if (split) { 1892 mGroupFlags |= FLAG_SPLIT_MOTION_EVENTS; 1893 } else { 1894 mGroupFlags &= ~FLAG_SPLIT_MOTION_EVENTS; 1895 } 1896 } 1897 1898 /** 1899 * Returns true if MotionEvents dispatched to this ViewGroup can be split to multiple children. 1900 * @return true if MotionEvents dispatched to this ViewGroup can be split to multiple children. 1901 */ 1902 public boolean isMotionEventSplittingEnabled() { 1903 return (mGroupFlags & FLAG_SPLIT_MOTION_EVENTS) == FLAG_SPLIT_MOTION_EVENTS; 1904 } 1905 1906 /** 1907 * {@inheritDoc} 1908 */ 1909 public void requestDisallowInterceptTouchEvent(boolean disallowIntercept) { 1910 1911 if (disallowIntercept == ((mGroupFlags & FLAG_DISALLOW_INTERCEPT) != 0)) { 1912 // We're already in this state, assume our ancestors are too 1913 return; 1914 } 1915 1916 if (disallowIntercept) { 1917 mGroupFlags |= FLAG_DISALLOW_INTERCEPT; 1918 } else { 1919 mGroupFlags &= ~FLAG_DISALLOW_INTERCEPT; 1920 } 1921 1922 // Pass it up to our parent 1923 if (mParent != null) { 1924 mParent.requestDisallowInterceptTouchEvent(disallowIntercept); 1925 } 1926 } 1927 1928 /** 1929 * Implement this method to intercept all touch screen motion events. This 1930 * allows you to watch events as they are dispatched to your children, and 1931 * take ownership of the current gesture at any point. 1932 * 1933 * <p>Using this function takes some care, as it has a fairly complicated 1934 * interaction with {@link View#onTouchEvent(MotionEvent) 1935 * View.onTouchEvent(MotionEvent)}, and using it requires implementing 1936 * that method as well as this one in the correct way. Events will be 1937 * received in the following order: 1938 * 1939 * <ol> 1940 * <li> You will receive the down event here. 1941 * <li> The down event will be handled either by a child of this view 1942 * group, or given to your own onTouchEvent() method to handle; this means 1943 * you should implement onTouchEvent() to return true, so you will 1944 * continue to see the rest of the gesture (instead of looking for 1945 * a parent view to handle it). Also, by returning true from 1946 * onTouchEvent(), you will not receive any following 1947 * events in onInterceptTouchEvent() and all touch processing must 1948 * happen in onTouchEvent() like normal. 1949 * <li> For as long as you return false from this function, each following 1950 * event (up to and including the final up) will be delivered first here 1951 * and then to the target's onTouchEvent(). 1952 * <li> If you return true from here, you will not receive any 1953 * following events: the target view will receive the same event but 1954 * with the action {@link MotionEvent#ACTION_CANCEL}, and all further 1955 * events will be delivered to your onTouchEvent() method and no longer 1956 * appear here. 1957 * </ol> 1958 * 1959 * @param ev The motion event being dispatched down the hierarchy. 1960 * @return Return true to steal motion events from the children and have 1961 * them dispatched to this ViewGroup through onTouchEvent(). 1962 * The current target will receive an ACTION_CANCEL event, and no further 1963 * messages will be delivered here. 1964 */ 1965 public boolean onInterceptTouchEvent(MotionEvent ev) { 1966 return false; 1967 } 1968 1969 /** 1970 * {@inheritDoc} 1971 * 1972 * Looks for a view to give focus to respecting the setting specified by 1973 * {@link #getDescendantFocusability()}. 1974 * 1975 * Uses {@link #onRequestFocusInDescendants(int, android.graphics.Rect)} to 1976 * find focus within the children of this group when appropriate. 1977 * 1978 * @see #FOCUS_BEFORE_DESCENDANTS 1979 * @see #FOCUS_AFTER_DESCENDANTS 1980 * @see #FOCUS_BLOCK_DESCENDANTS 1981 * @see #onRequestFocusInDescendants 1982 */ 1983 @Override 1984 public boolean requestFocus(int direction, Rect previouslyFocusedRect) { 1985 if (DBG) { 1986 System.out.println(this + " ViewGroup.requestFocus direction=" 1987 + direction); 1988 } 1989 int descendantFocusability = getDescendantFocusability(); 1990 1991 switch (descendantFocusability) { 1992 case FOCUS_BLOCK_DESCENDANTS: 1993 return super.requestFocus(direction, previouslyFocusedRect); 1994 case FOCUS_BEFORE_DESCENDANTS: { 1995 final boolean took = super.requestFocus(direction, previouslyFocusedRect); 1996 return took ? took : onRequestFocusInDescendants(direction, previouslyFocusedRect); 1997 } 1998 case FOCUS_AFTER_DESCENDANTS: { 1999 final boolean took = onRequestFocusInDescendants(direction, previouslyFocusedRect); 2000 return took ? took : super.requestFocus(direction, previouslyFocusedRect); 2001 } 2002 default: 2003 throw new IllegalStateException("descendant focusability must be " 2004 + "one of FOCUS_BEFORE_DESCENDANTS, FOCUS_AFTER_DESCENDANTS, FOCUS_BLOCK_DESCENDANTS " 2005 + "but is " + descendantFocusability); 2006 } 2007 } 2008 2009 /** 2010 * Look for a descendant to call {@link View#requestFocus} on. 2011 * Called by {@link ViewGroup#requestFocus(int, android.graphics.Rect)} 2012 * when it wants to request focus within its children. Override this to 2013 * customize how your {@link ViewGroup} requests focus within its children. 2014 * @param direction One of FOCUS_UP, FOCUS_DOWN, FOCUS_LEFT, and FOCUS_RIGHT 2015 * @param previouslyFocusedRect The rectangle (in this View's coordinate system) 2016 * to give a finer grained hint about where focus is coming from. May be null 2017 * if there is no hint. 2018 * @return Whether focus was taken. 2019 */ 2020 @SuppressWarnings({"ConstantConditions"}) 2021 protected boolean onRequestFocusInDescendants(int direction, 2022 Rect previouslyFocusedRect) { 2023 int index; 2024 int increment; 2025 int end; 2026 int count = mChildrenCount; 2027 if ((direction & FOCUS_FORWARD) != 0) { 2028 index = 0; 2029 increment = 1; 2030 end = count; 2031 } else { 2032 index = count - 1; 2033 increment = -1; 2034 end = -1; 2035 } 2036 final View[] children = mChildren; 2037 for (int i = index; i != end; i += increment) { 2038 View child = children[i]; 2039 if ((child.mViewFlags & VISIBILITY_MASK) == VISIBLE) { 2040 if (child.requestFocus(direction, previouslyFocusedRect)) { 2041 return true; 2042 } 2043 } 2044 } 2045 return false; 2046 } 2047 2048 /** 2049 * {@inheritDoc} 2050 * 2051 * @hide 2052 */ 2053 @Override 2054 public void dispatchStartTemporaryDetach() { 2055 super.dispatchStartTemporaryDetach(); 2056 final int count = mChildrenCount; 2057 final View[] children = mChildren; 2058 for (int i = 0; i < count; i++) { 2059 children[i].dispatchStartTemporaryDetach(); 2060 } 2061 } 2062 2063 /** 2064 * {@inheritDoc} 2065 * 2066 * @hide 2067 */ 2068 @Override 2069 public void dispatchFinishTemporaryDetach() { 2070 super.dispatchFinishTemporaryDetach(); 2071 final int count = mChildrenCount; 2072 final View[] children = mChildren; 2073 for (int i = 0; i < count; i++) { 2074 children[i].dispatchFinishTemporaryDetach(); 2075 } 2076 } 2077 2078 /** 2079 * {@inheritDoc} 2080 */ 2081 @Override 2082 void dispatchAttachedToWindow(AttachInfo info, int visibility) { 2083 super.dispatchAttachedToWindow(info, visibility); 2084 visibility |= mViewFlags & VISIBILITY_MASK; 2085 final int count = mChildrenCount; 2086 final View[] children = mChildren; 2087 for (int i = 0; i < count; i++) { 2088 children[i].dispatchAttachedToWindow(info, visibility); 2089 } 2090 } 2091 2092 @Override 2093 public boolean dispatchPopulateAccessibilityEvent(AccessibilityEvent event) { 2094 boolean populated = false; 2095 for (int i = 0, count = getChildCount(); i < count; i++) { 2096 populated |= getChildAt(i).dispatchPopulateAccessibilityEvent(event); 2097 } 2098 return populated; 2099 } 2100 2101 /** 2102 * {@inheritDoc} 2103 */ 2104 @Override 2105 void dispatchDetachedFromWindow() { 2106 // If we still have a touch target, we are still in the process of 2107 // dispatching motion events to a child; we need to get rid of that 2108 // child to avoid dispatching events to it after the window is torn 2109 // down. To make sure we keep the child in a consistent state, we 2110 // first send it an ACTION_CANCEL motion event. 2111 cancelAndClearTouchTargets(null); 2112 2113 // In case view is detached while transition is running 2114 mLayoutSuppressed = false; 2115 2116 // Tear down our drag tracking 2117 mDragNotifiedChildren = null; 2118 if (mCurrentDrag != null) { 2119 mCurrentDrag.recycle(); 2120 mCurrentDrag = null; 2121 } 2122 2123 final int count = mChildrenCount; 2124 final View[] children = mChildren; 2125 for (int i = 0; i < count; i++) { 2126 children[i].dispatchDetachedFromWindow(); 2127 } 2128 super.dispatchDetachedFromWindow(); 2129 } 2130 2131 /** 2132 * {@inheritDoc} 2133 */ 2134 @Override 2135 public void setPadding(int left, int top, int right, int bottom) { 2136 super.setPadding(left, top, right, bottom); 2137 2138 if ((mPaddingLeft | mPaddingTop | mPaddingRight | mPaddingBottom) != 0) { 2139 mGroupFlags |= FLAG_PADDING_NOT_NULL; 2140 } else { 2141 mGroupFlags &= ~FLAG_PADDING_NOT_NULL; 2142 } 2143 } 2144 2145 /** 2146 * {@inheritDoc} 2147 */ 2148 @Override 2149 protected void dispatchSaveInstanceState(SparseArray<Parcelable> container) { 2150 super.dispatchSaveInstanceState(container); 2151 final int count = mChildrenCount; 2152 final View[] children = mChildren; 2153 for (int i = 0; i < count; i++) { 2154 View c = children[i]; 2155 if ((c.mViewFlags & PARENT_SAVE_DISABLED_MASK) != PARENT_SAVE_DISABLED) { 2156 c.dispatchSaveInstanceState(container); 2157 } 2158 } 2159 } 2160 2161 /** 2162 * Perform dispatching of a {@link #saveHierarchyState freeze()} to only this view, 2163 * not to its children. For use when overriding 2164 * {@link #dispatchSaveInstanceState dispatchFreeze()} to allow subclasses to freeze 2165 * their own state but not the state of their children. 2166 * 2167 * @param container the container 2168 */ 2169 protected void dispatchFreezeSelfOnly(SparseArray<Parcelable> container) { 2170 super.dispatchSaveInstanceState(container); 2171 } 2172 2173 /** 2174 * {@inheritDoc} 2175 */ 2176 @Override 2177 protected void dispatchRestoreInstanceState(SparseArray<Parcelable> container) { 2178 super.dispatchRestoreInstanceState(container); 2179 final int count = mChildrenCount; 2180 final View[] children = mChildren; 2181 for (int i = 0; i < count; i++) { 2182 View c = children[i]; 2183 if ((c.mViewFlags & PARENT_SAVE_DISABLED_MASK) != PARENT_SAVE_DISABLED) { 2184 c.dispatchRestoreInstanceState(container); 2185 } 2186 } 2187 } 2188 2189 /** 2190 * Perform dispatching of a {@link #restoreHierarchyState thaw()} to only this view, 2191 * not to its children. For use when overriding 2192 * {@link #dispatchRestoreInstanceState dispatchThaw()} to allow subclasses to thaw 2193 * their own state but not the state of their children. 2194 * 2195 * @param container the container 2196 */ 2197 protected void dispatchThawSelfOnly(SparseArray<Parcelable> container) { 2198 super.dispatchRestoreInstanceState(container); 2199 } 2200 2201 /** 2202 * Enables or disables the drawing cache for each child of this view group. 2203 * 2204 * @param enabled true to enable the cache, false to dispose of it 2205 */ 2206 protected void setChildrenDrawingCacheEnabled(boolean enabled) { 2207 if (enabled || (mPersistentDrawingCache & PERSISTENT_ALL_CACHES) != PERSISTENT_ALL_CACHES) { 2208 final View[] children = mChildren; 2209 final int count = mChildrenCount; 2210 for (int i = 0; i < count; i++) { 2211 children[i].setDrawingCacheEnabled(enabled); 2212 } 2213 } 2214 } 2215 2216 @Override 2217 protected void onAnimationStart() { 2218 super.onAnimationStart(); 2219 2220 // When this ViewGroup's animation starts, build the cache for the children 2221 if ((mGroupFlags & FLAG_ANIMATION_CACHE) == FLAG_ANIMATION_CACHE) { 2222 final int count = mChildrenCount; 2223 final View[] children = mChildren; 2224 final boolean buildCache = !isHardwareAccelerated(); 2225 2226 for (int i = 0; i < count; i++) { 2227 final View child = children[i]; 2228 if ((child.mViewFlags & VISIBILITY_MASK) == VISIBLE) { 2229 child.setDrawingCacheEnabled(true); 2230 if (buildCache) { 2231 child.buildDrawingCache(true); 2232 } 2233 } 2234 } 2235 2236 mGroupFlags |= FLAG_CHILDREN_DRAWN_WITH_CACHE; 2237 } 2238 } 2239 2240 @Override 2241 protected void onAnimationEnd() { 2242 super.onAnimationEnd(); 2243 2244 // When this ViewGroup's animation ends, destroy the cache of the children 2245 if ((mGroupFlags & FLAG_ANIMATION_CACHE) == FLAG_ANIMATION_CACHE) { 2246 mGroupFlags &= ~FLAG_CHILDREN_DRAWN_WITH_CACHE; 2247 2248 if ((mPersistentDrawingCache & PERSISTENT_ANIMATION_CACHE) == 0) { 2249 setChildrenDrawingCacheEnabled(false); 2250 } 2251 } 2252 } 2253 2254 @Override 2255 Bitmap createSnapshot(Bitmap.Config quality, int backgroundColor, boolean skipChildren) { 2256 int count = mChildrenCount; 2257 int[] visibilities = null; 2258 2259 if (skipChildren) { 2260 visibilities = new int[count]; 2261 for (int i = 0; i < count; i++) { 2262 View child = getChildAt(i); 2263 visibilities[i] = child.getVisibility(); 2264 if (visibilities[i] == View.VISIBLE) { 2265 child.setVisibility(INVISIBLE); 2266 } 2267 } 2268 } 2269 2270 Bitmap b = super.createSnapshot(quality, backgroundColor, skipChildren); 2271 2272 if (skipChildren) { 2273 for (int i = 0; i < count; i++) { 2274 getChildAt(i).setVisibility(visibilities[i]); 2275 } 2276 } 2277 2278 return b; 2279 } 2280 2281 /** 2282 * {@inheritDoc} 2283 */ 2284 @Override 2285 protected void dispatchDraw(Canvas canvas) { 2286 final int count = mChildrenCount; 2287 final View[] children = mChildren; 2288 int flags = mGroupFlags; 2289 2290 if ((flags & FLAG_RUN_ANIMATION) != 0 && canAnimate()) { 2291 final boolean cache = (mGroupFlags & FLAG_ANIMATION_CACHE) == FLAG_ANIMATION_CACHE; 2292 2293 final boolean buildCache = !isHardwareAccelerated(); 2294 for (int i = 0; i < count; i++) { 2295 final View child = children[i]; 2296 if ((child.mViewFlags & VISIBILITY_MASK) == VISIBLE) { 2297 final LayoutParams params = child.getLayoutParams(); 2298 attachLayoutAnimationParameters(child, params, i, count); 2299 bindLayoutAnimation(child); 2300 if (cache) { 2301 child.setDrawingCacheEnabled(true); 2302 if (buildCache) { 2303 child.buildDrawingCache(true); 2304 } 2305 } 2306 } 2307 } 2308 2309 final LayoutAnimationController controller = mLayoutAnimationController; 2310 if (controller.willOverlap()) { 2311 mGroupFlags |= FLAG_OPTIMIZE_INVALIDATE; 2312 } 2313 2314 controller.start(); 2315 2316 mGroupFlags &= ~FLAG_RUN_ANIMATION; 2317 mGroupFlags &= ~FLAG_ANIMATION_DONE; 2318 2319 if (cache) { 2320 mGroupFlags |= FLAG_CHILDREN_DRAWN_WITH_CACHE; 2321 } 2322 2323 if (mAnimationListener != null) { 2324 mAnimationListener.onAnimationStart(controller.getAnimation()); 2325 } 2326 } 2327 2328 int saveCount = 0; 2329 final boolean clipToPadding = (flags & CLIP_TO_PADDING_MASK) == CLIP_TO_PADDING_MASK; 2330 if (clipToPadding) { 2331 saveCount = canvas.save(); 2332 canvas.clipRect(mScrollX + mPaddingLeft, mScrollY + mPaddingTop, 2333 mScrollX + mRight - mLeft - mPaddingRight, 2334 mScrollY + mBottom - mTop - mPaddingBottom); 2335 2336 } 2337 2338 // We will draw our child's animation, let's reset the flag 2339 mPrivateFlags &= ~DRAW_ANIMATION; 2340 mGroupFlags &= ~FLAG_INVALIDATE_REQUIRED; 2341 2342 boolean more = false; 2343 final long drawingTime = getDrawingTime(); 2344 2345 if ((flags & FLAG_USE_CHILD_DRAWING_ORDER) == 0) { 2346 for (int i = 0; i < count; i++) { 2347 final View child = children[i]; 2348 if ((child.mViewFlags & VISIBILITY_MASK) == VISIBLE || child.getAnimation() != null) { 2349 more |= drawChild(canvas, child, drawingTime); 2350 } 2351 } 2352 } else { 2353 for (int i = 0; i < count; i++) { 2354 final View child = children[getChildDrawingOrder(count, i)]; 2355 if ((child.mViewFlags & VISIBILITY_MASK) == VISIBLE || child.getAnimation() != null) { 2356 more |= drawChild(canvas, child, drawingTime); 2357 } 2358 } 2359 } 2360 2361 // Draw any disappearing views that have animations 2362 if (mDisappearingChildren != null) { 2363 final ArrayList<View> disappearingChildren = mDisappearingChildren; 2364 final int disappearingCount = disappearingChildren.size() - 1; 2365 // Go backwards -- we may delete as animations finish 2366 for (int i = disappearingCount; i >= 0; i--) { 2367 final View child = disappearingChildren.get(i); 2368 more |= drawChild(canvas, child, drawingTime); 2369 } 2370 } 2371 2372 if (clipToPadding) { 2373 canvas.restoreToCount(saveCount); 2374 } 2375 2376 // mGroupFlags might have been updated by drawChild() 2377 flags = mGroupFlags; 2378 2379 if ((flags & FLAG_INVALIDATE_REQUIRED) == FLAG_INVALIDATE_REQUIRED) { 2380 invalidate(true); 2381 } 2382 2383 if ((flags & FLAG_ANIMATION_DONE) == 0 && (flags & FLAG_NOTIFY_ANIMATION_LISTENER) == 0 && 2384 mLayoutAnimationController.isDone() && !more) { 2385 // We want to erase the drawing cache and notify the listener after the 2386 // next frame is drawn because one extra invalidate() is caused by 2387 // drawChild() after the animation is over 2388 mGroupFlags |= FLAG_NOTIFY_ANIMATION_LISTENER; 2389 final Runnable end = new Runnable() { 2390 public void run() { 2391 notifyAnimationListener(); 2392 } 2393 }; 2394 post(end); 2395 } 2396 } 2397 2398 /** 2399 * Returns the index of the child to draw for this iteration. Override this 2400 * if you want to change the drawing order of children. By default, it 2401 * returns i. 2402 * <p> 2403 * NOTE: In order for this method to be called, you must enable child ordering 2404 * first by calling {@link #setChildrenDrawingOrderEnabled(boolean)}. 2405 * 2406 * @param i The current iteration. 2407 * @return The index of the child to draw this iteration. 2408 * 2409 * @see #setChildrenDrawingOrderEnabled(boolean) 2410 * @see #isChildrenDrawingOrderEnabled() 2411 */ 2412 protected int getChildDrawingOrder(int childCount, int i) { 2413 return i; 2414 } 2415 2416 private void notifyAnimationListener() { 2417 mGroupFlags &= ~FLAG_NOTIFY_ANIMATION_LISTENER; 2418 mGroupFlags |= FLAG_ANIMATION_DONE; 2419 2420 if (mAnimationListener != null) { 2421 final Runnable end = new Runnable() { 2422 public void run() { 2423 mAnimationListener.onAnimationEnd(mLayoutAnimationController.getAnimation()); 2424 } 2425 }; 2426 post(end); 2427 } 2428 2429 if ((mGroupFlags & FLAG_ANIMATION_CACHE) == FLAG_ANIMATION_CACHE) { 2430 mGroupFlags &= ~FLAG_CHILDREN_DRAWN_WITH_CACHE; 2431 if ((mPersistentDrawingCache & PERSISTENT_ANIMATION_CACHE) == 0) { 2432 setChildrenDrawingCacheEnabled(false); 2433 } 2434 } 2435 2436 invalidate(true); 2437 } 2438 2439 /** 2440 * This method is used to cause children of this ViewGroup to restore or recreate their 2441 * display lists. It is called by getDisplayList() when the parent ViewGroup does not need 2442 * to recreate its own display list, which would happen if it went through the normal 2443 * draw/dispatchDraw mechanisms. 2444 * 2445 * @hide 2446 */ 2447 @Override 2448 protected void dispatchGetDisplayList() { 2449 final int count = mChildrenCount; 2450 final View[] children = mChildren; 2451 for (int i = 0; i < count; i++) { 2452 final View child = children[i]; 2453 if ((child.mViewFlags & VISIBILITY_MASK) == VISIBLE || child.getAnimation() != null) { 2454 child.mRecreateDisplayList = (child.mPrivateFlags & INVALIDATED) == INVALIDATED; 2455 child.mPrivateFlags &= ~INVALIDATED; 2456 child.getDisplayList(); 2457 child.mRecreateDisplayList = false; 2458 } 2459 } 2460 } 2461 2462 /** 2463 * Draw one child of this View Group. This method is responsible for getting 2464 * the canvas in the right state. This includes clipping, translating so 2465 * that the child's scrolled origin is at 0, 0, and applying any animation 2466 * transformations. 2467 * 2468 * @param canvas The canvas on which to draw the child 2469 * @param child Who to draw 2470 * @param drawingTime The time at which draw is occuring 2471 * @return True if an invalidate() was issued 2472 */ 2473 protected boolean drawChild(Canvas canvas, View child, long drawingTime) { 2474 boolean more = false; 2475 2476 final int cl = child.mLeft; 2477 final int ct = child.mTop; 2478 final int cr = child.mRight; 2479 final int cb = child.mBottom; 2480 2481 final boolean childHasIdentityMatrix = child.hasIdentityMatrix(); 2482 2483 final int flags = mGroupFlags; 2484 2485 if ((flags & FLAG_CLEAR_TRANSFORMATION) == FLAG_CLEAR_TRANSFORMATION) { 2486 mChildTransformation.clear(); 2487 mGroupFlags &= ~FLAG_CLEAR_TRANSFORMATION; 2488 } 2489 2490 Transformation transformToApply = null; 2491 Transformation invalidationTransform; 2492 final Animation a = child.getAnimation(); 2493 boolean concatMatrix = false; 2494 2495 boolean scalingRequired = false; 2496 boolean caching; 2497 int layerType = mDrawLayers ? child.getLayerType() : LAYER_TYPE_NONE; 2498 2499 final boolean hardwareAccelerated = canvas.isHardwareAccelerated(); 2500 if ((flags & FLAG_CHILDREN_DRAWN_WITH_CACHE) == FLAG_CHILDREN_DRAWN_WITH_CACHE || 2501 (flags & FLAG_ALWAYS_DRAWN_WITH_CACHE) == FLAG_ALWAYS_DRAWN_WITH_CACHE) { 2502 caching = true; 2503 if (mAttachInfo != null) scalingRequired = mAttachInfo.mScalingRequired; 2504 } else { 2505 caching = (layerType != LAYER_TYPE_NONE) || hardwareAccelerated; 2506 } 2507 2508 if (a != null) { 2509 final boolean initialized = a.isInitialized(); 2510 if (!initialized) { 2511 a.initialize(cr - cl, cb - ct, getWidth(), getHeight()); 2512 a.initializeInvalidateRegion(0, 0, cr - cl, cb - ct); 2513 child.onAnimationStart(); 2514 } 2515 2516 more = a.getTransformation(drawingTime, mChildTransformation, 2517 scalingRequired ? mAttachInfo.mApplicationScale : 1f); 2518 if (scalingRequired && mAttachInfo.mApplicationScale != 1f) { 2519 if (mInvalidationTransformation == null) { 2520 mInvalidationTransformation = new Transformation(); 2521 } 2522 invalidationTransform = mInvalidationTransformation; 2523 a.getTransformation(drawingTime, invalidationTransform, 1f); 2524 } else { 2525 invalidationTransform = mChildTransformation; 2526 } 2527 transformToApply = mChildTransformation; 2528 2529 concatMatrix = a.willChangeTransformationMatrix(); 2530 2531 if (more) { 2532 if (!a.willChangeBounds()) { 2533 if ((flags & (FLAG_OPTIMIZE_INVALIDATE | FLAG_ANIMATION_DONE)) == 2534 FLAG_OPTIMIZE_INVALIDATE) { 2535 mGroupFlags |= FLAG_INVALIDATE_REQUIRED; 2536 } else if ((flags & FLAG_INVALIDATE_REQUIRED) == 0) { 2537 // The child need to draw an animation, potentially offscreen, so 2538 // make sure we do not cancel invalidate requests 2539 mPrivateFlags |= DRAW_ANIMATION; 2540 invalidate(cl, ct, cr, cb); 2541 } 2542 } else { 2543 if (mInvalidateRegion == null) { 2544 mInvalidateRegion = new RectF(); 2545 } 2546 final RectF region = mInvalidateRegion; 2547 a.getInvalidateRegion(0, 0, cr - cl, cb - ct, region, invalidationTransform); 2548 2549 // The child need to draw an animation, potentially offscreen, so 2550 // make sure we do not cancel invalidate requests 2551 mPrivateFlags |= DRAW_ANIMATION; 2552 2553 final int left = cl + (int) region.left; 2554 final int top = ct + (int) region.top; 2555 invalidate(left, top, left + (int) region.width(), top + (int) region.height()); 2556 } 2557 } 2558 } else if ((flags & FLAG_SUPPORT_STATIC_TRANSFORMATIONS) == 2559 FLAG_SUPPORT_STATIC_TRANSFORMATIONS) { 2560 final boolean hasTransform = getChildStaticTransformation(child, mChildTransformation); 2561 if (hasTransform) { 2562 final int transformType = mChildTransformation.getTransformationType(); 2563 transformToApply = transformType != Transformation.TYPE_IDENTITY ? 2564 mChildTransformation : null; 2565 concatMatrix = (transformType & Transformation.TYPE_MATRIX) != 0; 2566 } 2567 } 2568 2569 concatMatrix |= !childHasIdentityMatrix; 2570 2571 // Sets the flag as early as possible to allow draw() implementations 2572 // to call invalidate() successfully when doing animations 2573 child.mPrivateFlags |= DRAWN; 2574 2575 if (!concatMatrix && canvas.quickReject(cl, ct, cr, cb, Canvas.EdgeType.BW) && 2576 (child.mPrivateFlags & DRAW_ANIMATION) == 0) { 2577 return more; 2578 } 2579 2580 float alpha = child.getAlpha(); 2581 // Bail out early if the view does not need to be drawn 2582 if (alpha <= ViewConfiguration.ALPHA_THRESHOLD && (child.mPrivateFlags & ALPHA_SET) == 0 && 2583 !(child instanceof SurfaceView)) { 2584 return more; 2585 } 2586 2587 if (hardwareAccelerated) { 2588 // Clear INVALIDATED flag to allow invalidation to occur during rendering, but 2589 // retain the flag's value temporarily in the mRecreateDisplayList flag 2590 child.mRecreateDisplayList = (child.mPrivateFlags & INVALIDATED) == INVALIDATED; 2591 child.mPrivateFlags &= ~INVALIDATED; 2592 } 2593 2594 child.computeScroll(); 2595 2596 final int sx = child.mScrollX; 2597 final int sy = child.mScrollY; 2598 2599 DisplayList displayList = null; 2600 Bitmap cache = null; 2601 boolean hasDisplayList = false; 2602 if (caching) { 2603 if (!hardwareAccelerated) { 2604 if (layerType != LAYER_TYPE_NONE) { 2605 layerType = LAYER_TYPE_SOFTWARE; 2606 child.buildDrawingCache(true); 2607 } 2608 cache = child.getDrawingCache(true); 2609 } else { 2610 switch (layerType) { 2611 case LAYER_TYPE_SOFTWARE: 2612 child.buildDrawingCache(true); 2613 cache = child.getDrawingCache(true); 2614 break; 2615 case LAYER_TYPE_NONE: 2616 // Delay getting the display list until animation-driven alpha values are 2617 // set up and possibly passed on to the view 2618 hasDisplayList = child.canHaveDisplayList(); 2619 break; 2620 } 2621 } 2622 } 2623 2624 final boolean hasNoCache = cache == null || hasDisplayList; 2625 final boolean offsetForScroll = cache == null && !hasDisplayList && 2626 layerType != LAYER_TYPE_HARDWARE; 2627 2628 final int restoreTo = canvas.save(); 2629 if (offsetForScroll) { 2630 canvas.translate(cl - sx, ct - sy); 2631 } else { 2632 canvas.translate(cl, ct); 2633 if (scalingRequired) { 2634 // mAttachInfo cannot be null, otherwise scalingRequired == false 2635 final float scale = 1.0f / mAttachInfo.mApplicationScale; 2636 canvas.scale(scale, scale); 2637 } 2638 } 2639 2640 if (transformToApply != null || alpha < 1.0f || !child.hasIdentityMatrix()) { 2641 if (transformToApply != null || !childHasIdentityMatrix) { 2642 int transX = 0; 2643 int transY = 0; 2644 2645 if (offsetForScroll) { 2646 transX = -sx; 2647 transY = -sy; 2648 } 2649 2650 if (transformToApply != null) { 2651 if (concatMatrix) { 2652 // Undo the scroll translation, apply the transformation matrix, 2653 // then redo the scroll translate to get the correct result. 2654 canvas.translate(-transX, -transY); 2655 canvas.concat(transformToApply.getMatrix()); 2656 canvas.translate(transX, transY); 2657 mGroupFlags |= FLAG_CLEAR_TRANSFORMATION; 2658 } 2659 2660 float transformAlpha = transformToApply.getAlpha(); 2661 if (transformAlpha < 1.0f) { 2662 alpha *= transformToApply.getAlpha(); 2663 mGroupFlags |= FLAG_CLEAR_TRANSFORMATION; 2664 } 2665 } 2666 2667 if (!childHasIdentityMatrix) { 2668 canvas.translate(-transX, -transY); 2669 canvas.concat(child.getMatrix()); 2670 canvas.translate(transX, transY); 2671 } 2672 } 2673 2674 if (alpha < 1.0f) { 2675 mGroupFlags |= FLAG_CLEAR_TRANSFORMATION; 2676 if (hasNoCache) { 2677 final int multipliedAlpha = (int) (255 * alpha); 2678 if (!child.onSetAlpha(multipliedAlpha)) { 2679 int layerFlags = Canvas.HAS_ALPHA_LAYER_SAVE_FLAG; 2680 if ((flags & FLAG_CLIP_CHILDREN) == FLAG_CLIP_CHILDREN || 2681 layerType != LAYER_TYPE_NONE) { 2682 layerFlags |= Canvas.CLIP_TO_LAYER_SAVE_FLAG; 2683 } 2684 if (layerType == LAYER_TYPE_NONE) { 2685 final int scrollX = hasDisplayList ? 0 : sx; 2686 final int scrollY = hasDisplayList ? 0 : sy; 2687 canvas.saveLayerAlpha(scrollX, scrollY, scrollX + cr - cl, 2688 scrollY + cb - ct, multipliedAlpha, layerFlags); 2689 } 2690 } else { 2691 // Alpha is handled by the child directly, clobber the layer's alpha 2692 child.mPrivateFlags |= ALPHA_SET; 2693 } 2694 } 2695 } 2696 } else if ((child.mPrivateFlags & ALPHA_SET) == ALPHA_SET) { 2697 child.onSetAlpha(255); 2698 child.mPrivateFlags &= ~ALPHA_SET; 2699 } 2700 2701 if ((flags & FLAG_CLIP_CHILDREN) == FLAG_CLIP_CHILDREN) { 2702 if (offsetForScroll) { 2703 canvas.clipRect(sx, sy, sx + (cr - cl), sy + (cb - ct)); 2704 } else { 2705 if (!scalingRequired || cache == null) { 2706 canvas.clipRect(0, 0, cr - cl, cb - ct); 2707 } else { 2708 canvas.clipRect(0, 0, cache.getWidth(), cache.getHeight()); 2709 } 2710 } 2711 } 2712 2713 if (hasDisplayList) { 2714 displayList = child.getDisplayList(); 2715 } 2716 2717 if (hasNoCache) { 2718 boolean layerRendered = false; 2719 if (layerType == LAYER_TYPE_HARDWARE) { 2720 final HardwareLayer layer = child.getHardwareLayer(); 2721 if (layer != null && layer.isValid()) { 2722 child.mLayerPaint.setAlpha((int) (alpha * 255)); 2723 ((HardwareCanvas) canvas).drawHardwareLayer(layer, 0, 0, child.mLayerPaint); 2724 layerRendered = true; 2725 } else { 2726 final int scrollX = hasDisplayList ? 0 : sx; 2727 final int scrollY = hasDisplayList ? 0 : sy; 2728 canvas.saveLayer(scrollX, scrollY, 2729 scrollX + cr - cl, scrollY + cb - ct, child.mLayerPaint, 2730 Canvas.HAS_ALPHA_LAYER_SAVE_FLAG | Canvas.CLIP_TO_LAYER_SAVE_FLAG); 2731 } 2732 } 2733 2734 if (!layerRendered) { 2735 if (!hasDisplayList) { 2736 // Fast path for layouts with no backgrounds 2737 if ((child.mPrivateFlags & SKIP_DRAW) == SKIP_DRAW) { 2738 if (ViewDebug.TRACE_HIERARCHY) { 2739 ViewDebug.trace(this, ViewDebug.HierarchyTraceType.DRAW); 2740 } 2741 child.mPrivateFlags &= ~DIRTY_MASK; 2742 child.dispatchDraw(canvas); 2743 } else { 2744 child.draw(canvas); 2745 } 2746 } else { 2747 child.mPrivateFlags &= ~DIRTY_MASK; 2748 ((HardwareCanvas) canvas).drawDisplayList(displayList, cr - cl, cb - ct, null); 2749 } 2750 } 2751 } else if (cache != null) { 2752 child.mPrivateFlags &= ~DIRTY_MASK; 2753 Paint cachePaint; 2754 2755 if (layerType == LAYER_TYPE_NONE) { 2756 cachePaint = mCachePaint; 2757 if (alpha < 1.0f) { 2758 cachePaint.setAlpha((int) (alpha * 255)); 2759 mGroupFlags |= FLAG_ALPHA_LOWER_THAN_ONE; 2760 } else if ((flags & FLAG_ALPHA_LOWER_THAN_ONE) == FLAG_ALPHA_LOWER_THAN_ONE) { 2761 cachePaint.setAlpha(255); 2762 mGroupFlags &= ~FLAG_ALPHA_LOWER_THAN_ONE; 2763 } 2764 } else { 2765 cachePaint = child.mLayerPaint; 2766 cachePaint.setAlpha((int) (alpha * 255)); 2767 } 2768 canvas.drawBitmap(cache, 0.0f, 0.0f, cachePaint); 2769 } 2770 2771 canvas.restoreToCount(restoreTo); 2772 2773 if (a != null && !more) { 2774 if (!hardwareAccelerated && !a.getFillAfter()) { 2775 child.onSetAlpha(255); 2776 } 2777 finishAnimatingView(child, a); 2778 } 2779 2780 if (more && hardwareAccelerated) { 2781 // invalidation is the trigger to recreate display lists, so if we're using 2782 // display lists to render, force an invalidate to allow the animation to 2783 // continue drawing another frame 2784 invalidate(true); 2785 if (a instanceof AlphaAnimation) { 2786 // alpha animations should cause the child to recreate its display list 2787 child.invalidate(true); 2788 } 2789 } 2790 2791 child.mRecreateDisplayList = false; 2792 2793 return more; 2794 } 2795 2796 /** 2797 * 2798 * @param enabled True if children should be drawn with layers, false otherwise. 2799 * 2800 * @hide 2801 */ 2802 public void setChildrenLayersEnabled(boolean enabled) { 2803 if (enabled != mDrawLayers) { 2804 mDrawLayers = enabled; 2805 invalidate(true); 2806 2807 // We need to invalidate any child with a layer. For instance, 2808 // if a child is backed by a hardware layer and we disable layers 2809 // the child is marked as not dirty (flags cleared the last time 2810 // the child was drawn inside its layer.) However, that child might 2811 // never have created its own display list or have an obsolete 2812 // display list. By invalidating the child we ensure the display 2813 // list is in sync with the content of the hardware layer. 2814 for (int i = 0; i < mChildrenCount; i++) { 2815 View child = mChildren[i]; 2816 if (child.mLayerType != LAYER_TYPE_NONE) { 2817 child.invalidate(true); 2818 } 2819 } 2820 } 2821 } 2822 2823 /** 2824 * By default, children are clipped to their bounds before drawing. This 2825 * allows view groups to override this behavior for animations, etc. 2826 * 2827 * @param clipChildren true to clip children to their bounds, 2828 * false otherwise 2829 * @attr ref android.R.styleable#ViewGroup_clipChildren 2830 */ 2831 public void setClipChildren(boolean clipChildren) { 2832 setBooleanFlag(FLAG_CLIP_CHILDREN, clipChildren); 2833 } 2834 2835 /** 2836 * By default, children are clipped to the padding of the ViewGroup. This 2837 * allows view groups to override this behavior 2838 * 2839 * @param clipToPadding true to clip children to the padding of the 2840 * group, false otherwise 2841 * @attr ref android.R.styleable#ViewGroup_clipToPadding 2842 */ 2843 public void setClipToPadding(boolean clipToPadding) { 2844 setBooleanFlag(FLAG_CLIP_TO_PADDING, clipToPadding); 2845 } 2846 2847 /** 2848 * {@inheritDoc} 2849 */ 2850 @Override 2851 public void dispatchSetSelected(boolean selected) { 2852 final View[] children = mChildren; 2853 final int count = mChildrenCount; 2854 for (int i = 0; i < count; i++) { 2855 children[i].setSelected(selected); 2856 } 2857 } 2858 2859 /** 2860 * {@inheritDoc} 2861 */ 2862 @Override 2863 public void dispatchSetActivated(boolean activated) { 2864 final View[] children = mChildren; 2865 final int count = mChildrenCount; 2866 for (int i = 0; i < count; i++) { 2867 children[i].setActivated(activated); 2868 } 2869 } 2870 2871 @Override 2872 protected void dispatchSetPressed(boolean pressed) { 2873 final View[] children = mChildren; 2874 final int count = mChildrenCount; 2875 for (int i = 0; i < count; i++) { 2876 children[i].setPressed(pressed); 2877 } 2878 } 2879 2880 /** 2881 * When this property is set to true, this ViewGroup supports static transformations on 2882 * children; this causes 2883 * {@link #getChildStaticTransformation(View, android.view.animation.Transformation)} to be 2884 * invoked when a child is drawn. 2885 * 2886 * Any subclass overriding 2887 * {@link #getChildStaticTransformation(View, android.view.animation.Transformation)} should 2888 * set this property to true. 2889 * 2890 * @param enabled True to enable static transformations on children, false otherwise. 2891 * 2892 * @see #FLAG_SUPPORT_STATIC_TRANSFORMATIONS 2893 */ 2894 protected void setStaticTransformationsEnabled(boolean enabled) { 2895 setBooleanFlag(FLAG_SUPPORT_STATIC_TRANSFORMATIONS, enabled); 2896 } 2897 2898 /** 2899 * {@inheritDoc} 2900 * 2901 * @see #setStaticTransformationsEnabled(boolean) 2902 */ 2903 protected boolean getChildStaticTransformation(View child, Transformation t) { 2904 return false; 2905 } 2906 2907 /** 2908 * {@hide} 2909 */ 2910 @Override 2911 protected View findViewTraversal(int id) { 2912 if (id == mID) { 2913 return this; 2914 } 2915 2916 final View[] where = mChildren; 2917 final int len = mChildrenCount; 2918 2919 for (int i = 0; i < len; i++) { 2920 View v = where[i]; 2921 2922 if ((v.mPrivateFlags & IS_ROOT_NAMESPACE) == 0) { 2923 v = v.findViewById(id); 2924 2925 if (v != null) { 2926 return v; 2927 } 2928 } 2929 } 2930 2931 return null; 2932 } 2933 2934 /** 2935 * {@hide} 2936 */ 2937 @Override 2938 protected View findViewWithTagTraversal(Object tag) { 2939 if (tag != null && tag.equals(mTag)) { 2940 return this; 2941 } 2942 2943 final View[] where = mChildren; 2944 final int len = mChildrenCount; 2945 2946 for (int i = 0; i < len; i++) { 2947 View v = where[i]; 2948 2949 if ((v.mPrivateFlags & IS_ROOT_NAMESPACE) == 0) { 2950 v = v.findViewWithTag(tag); 2951 2952 if (v != null) { 2953 return v; 2954 } 2955 } 2956 } 2957 2958 return null; 2959 } 2960 2961 /** 2962 * {@hide} 2963 */ 2964 @Override 2965 protected View findViewByPredicateTraversal(Predicate<View> predicate) { 2966 if (predicate.apply(this)) { 2967 return this; 2968 } 2969 2970 final View[] where = mChildren; 2971 final int len = mChildrenCount; 2972 2973 for (int i = 0; i < len; i++) { 2974 View v = where[i]; 2975 2976 if ((v.mPrivateFlags & IS_ROOT_NAMESPACE) == 0) { 2977 v = v.findViewByPredicate(predicate); 2978 2979 if (v != null) { 2980 return v; 2981 } 2982 } 2983 } 2984 2985 return null; 2986 } 2987 2988 /** 2989 * Adds a child view. If no layout parameters are already set on the child, the 2990 * default parameters for this ViewGroup are set on the child. 2991 * 2992 * @param child the child view to add 2993 * 2994 * @see #generateDefaultLayoutParams() 2995 */ 2996 public void addView(View child) { 2997 addView(child, -1); 2998 } 2999 3000 /** 3001 * Adds a child view. If no layout parameters are already set on the child, the 3002 * default parameters for this ViewGroup are set on the child. 3003 * 3004 * @param child the child view to add 3005 * @param index the position at which to add the child 3006 * 3007 * @see #generateDefaultLayoutParams() 3008 */ 3009 public void addView(View child, int index) { 3010 LayoutParams params = child.getLayoutParams(); 3011 if (params == null) { 3012 params = generateDefaultLayoutParams(); 3013 if (params == null) { 3014 throw new IllegalArgumentException("generateDefaultLayoutParams() cannot return null"); 3015 } 3016 } 3017 addView(child, index, params); 3018 } 3019 3020 /** 3021 * Adds a child view with this ViewGroup's default layout parameters and the 3022 * specified width and height. 3023 * 3024 * @param child the child view to add 3025 */ 3026 public void addView(View child, int width, int height) { 3027 final LayoutParams params = generateDefaultLayoutParams(); 3028 params.width = width; 3029 params.height = height; 3030 addView(child, -1, params); 3031 } 3032 3033 /** 3034 * Adds a child view with the specified layout parameters. 3035 * 3036 * @param child the child view to add 3037 * @param params the layout parameters to set on the child 3038 */ 3039 public void addView(View child, LayoutParams params) { 3040 addView(child, -1, params); 3041 } 3042 3043 /** 3044 * Adds a child view with the specified layout parameters. 3045 * 3046 * @param child the child view to add 3047 * @param index the position at which to add the child 3048 * @param params the layout parameters to set on the child 3049 */ 3050 public void addView(View child, int index, LayoutParams params) { 3051 if (DBG) { 3052 System.out.println(this + " addView"); 3053 } 3054 3055 // addViewInner() will call child.requestLayout() when setting the new LayoutParams 3056 // therefore, we call requestLayout() on ourselves before, so that the child's request 3057 // will be blocked at our level 3058 requestLayout(); 3059 invalidate(true); 3060 addViewInner(child, index, params, false); 3061 } 3062 3063 /** 3064 * {@inheritDoc} 3065 */ 3066 public void updateViewLayout(View view, ViewGroup.LayoutParams params) { 3067 if (!checkLayoutParams(params)) { 3068 throw new IllegalArgumentException("Invalid LayoutParams supplied to " + this); 3069 } 3070 if (view.mParent != this) { 3071 throw new IllegalArgumentException("Given view not a child of " + this); 3072 } 3073 view.setLayoutParams(params); 3074 } 3075 3076 /** 3077 * {@inheritDoc} 3078 */ 3079 protected boolean checkLayoutParams(ViewGroup.LayoutParams p) { 3080 return p != null; 3081 } 3082 3083 /** 3084 * Interface definition for a callback to be invoked when the hierarchy 3085 * within this view changed. The hierarchy changes whenever a child is added 3086 * to or removed from this view. 3087 */ 3088 public interface OnHierarchyChangeListener { 3089 /** 3090 * Called when a new child is added to a parent view. 3091 * 3092 * @param parent the view in which a child was added 3093 * @param child the new child view added in the hierarchy 3094 */ 3095 void onChildViewAdded(View parent, View child); 3096 3097 /** 3098 * Called when a child is removed from a parent view. 3099 * 3100 * @param parent the view from which the child was removed 3101 * @param child the child removed from the hierarchy 3102 */ 3103 void onChildViewRemoved(View parent, View child); 3104 } 3105 3106 /** 3107 * Register a callback to be invoked when a child is added to or removed 3108 * from this view. 3109 * 3110 * @param listener the callback to invoke on hierarchy change 3111 */ 3112 public void setOnHierarchyChangeListener(OnHierarchyChangeListener listener) { 3113 mOnHierarchyChangeListener = listener; 3114 } 3115 3116 /** 3117 * Adds a view during layout. This is useful if in your onLayout() method, 3118 * you need to add more views (as does the list view for example). 3119 * 3120 * If index is negative, it means put it at the end of the list. 3121 * 3122 * @param child the view to add to the group 3123 * @param index the index at which the child must be added 3124 * @param params the layout parameters to associate with the child 3125 * @return true if the child was added, false otherwise 3126 */ 3127 protected boolean addViewInLayout(View child, int index, LayoutParams params) { 3128 return addViewInLayout(child, index, params, false); 3129 } 3130 3131 /** 3132 * Adds a view during layout. This is useful if in your onLayout() method, 3133 * you need to add more views (as does the list view for example). 3134 * 3135 * If index is negative, it means put it at the end of the list. 3136 * 3137 * @param child the view to add to the group 3138 * @param index the index at which the child must be added 3139 * @param params the layout parameters to associate with the child 3140 * @param preventRequestLayout if true, calling this method will not trigger a 3141 * layout request on child 3142 * @return true if the child was added, false otherwise 3143 */ 3144 protected boolean addViewInLayout(View child, int index, LayoutParams params, 3145 boolean preventRequestLayout) { 3146 child.mParent = null; 3147 addViewInner(child, index, params, preventRequestLayout); 3148 child.mPrivateFlags = (child.mPrivateFlags & ~DIRTY_MASK) | DRAWN; 3149 return true; 3150 } 3151 3152 /** 3153 * Prevents the specified child to be laid out during the next layout pass. 3154 * 3155 * @param child the child on which to perform the cleanup 3156 */ 3157 protected void cleanupLayoutState(View child) { 3158 child.mPrivateFlags &= ~View.FORCE_LAYOUT; 3159 } 3160 3161 private void addViewInner(View child, int index, LayoutParams params, 3162 boolean preventRequestLayout) { 3163 3164 if (mTransition != null) { 3165 // Don't prevent other add transitions from completing, but cancel remove 3166 // transitions to let them complete the process before we add to the container 3167 mTransition.cancel(LayoutTransition.DISAPPEARING); 3168 } 3169 3170 if (child.getParent() != null) { 3171 throw new IllegalStateException("The specified child already has a parent. " + 3172 "You must call removeView() on the child's parent first."); 3173 } 3174 3175 if (mTransition != null) { 3176 mTransition.addChild(this, child); 3177 } 3178 3179 if (!checkLayoutParams(params)) { 3180 params = generateLayoutParams(params); 3181 } 3182 3183 if (preventRequestLayout) { 3184 child.mLayoutParams = params; 3185 } else { 3186 child.setLayoutParams(params); 3187 } 3188 3189 if (index < 0) { 3190 index = mChildrenCount; 3191 } 3192 3193 addInArray(child, index); 3194 3195 // tell our children 3196 if (preventRequestLayout) { 3197 child.assignParent(this); 3198 } else { 3199 child.mParent = this; 3200 } 3201 3202 if (child.hasFocus()) { 3203 requestChildFocus(child, child.findFocus()); 3204 } 3205 3206 AttachInfo ai = mAttachInfo; 3207 if (ai != null) { 3208 boolean lastKeepOn = ai.mKeepScreenOn; 3209 ai.mKeepScreenOn = false; 3210 child.dispatchAttachedToWindow(mAttachInfo, (mViewFlags&VISIBILITY_MASK)); 3211 if (ai.mKeepScreenOn) { 3212 needGlobalAttributesUpdate(true); 3213 } 3214 ai.mKeepScreenOn = lastKeepOn; 3215 } 3216 3217 if (mOnHierarchyChangeListener != null) { 3218 mOnHierarchyChangeListener.onChildViewAdded(this, child); 3219 } 3220 3221 if ((child.mViewFlags & DUPLICATE_PARENT_STATE) == DUPLICATE_PARENT_STATE) { 3222 mGroupFlags |= FLAG_NOTIFY_CHILDREN_ON_DRAWABLE_STATE_CHANGE; 3223 } 3224 } 3225 3226 private void addInArray(View child, int index) { 3227 View[] children = mChildren; 3228 final int count = mChildrenCount; 3229 final int size = children.length; 3230 if (index == count) { 3231 if (size == count) { 3232 mChildren = new View[size + ARRAY_CAPACITY_INCREMENT]; 3233 System.arraycopy(children, 0, mChildren, 0, size); 3234 children = mChildren; 3235 } 3236 children[mChildrenCount++] = child; 3237 } else if (index < count) { 3238 if (size == count) { 3239 mChildren = new View[size + ARRAY_CAPACITY_INCREMENT]; 3240 System.arraycopy(children, 0, mChildren, 0, index); 3241 System.arraycopy(children, index, mChildren, index + 1, count - index); 3242 children = mChildren; 3243 } else { 3244 System.arraycopy(children, index, children, index + 1, count - index); 3245 } 3246 children[index] = child; 3247 mChildrenCount++; 3248 if (mLastTouchDownIndex >= index) { 3249 mLastTouchDownIndex++; 3250 } 3251 } else { 3252 throw new IndexOutOfBoundsException("index=" + index + " count=" + count); 3253 } 3254 } 3255 3256 // This method also sets the child's mParent to null 3257 private void removeFromArray(int index) { 3258 final View[] children = mChildren; 3259 if (!(mTransitioningViews != null && mTransitioningViews.contains(children[index]))) { 3260 children[index].mParent = null; 3261 } 3262 final int count = mChildrenCount; 3263 if (index == count - 1) { 3264 children[--mChildrenCount] = null; 3265 } else if (index >= 0 && index < count) { 3266 System.arraycopy(children, index + 1, children, index, count - index - 1); 3267 children[--mChildrenCount] = null; 3268 } else { 3269 throw new IndexOutOfBoundsException(); 3270 } 3271 if (mLastTouchDownIndex == index) { 3272 mLastTouchDownTime = 0; 3273 mLastTouchDownIndex = -1; 3274 } else if (mLastTouchDownIndex > index) { 3275 mLastTouchDownIndex--; 3276 } 3277 } 3278 3279 // This method also sets the children's mParent to null 3280 private void removeFromArray(int start, int count) { 3281 final View[] children = mChildren; 3282 final int childrenCount = mChildrenCount; 3283 3284 start = Math.max(0, start); 3285 final int end = Math.min(childrenCount, start + count); 3286 3287 if (start == end) { 3288 return; 3289 } 3290 3291 if (end == childrenCount) { 3292 for (int i = start; i < end; i++) { 3293 children[i].mParent = null; 3294 children[i] = null; 3295 } 3296 } else { 3297 for (int i = start; i < end; i++) { 3298 children[i].mParent = null; 3299 } 3300 3301 // Since we're looping above, we might as well do the copy, but is arraycopy() 3302 // faster than the extra 2 bounds checks we would do in the loop? 3303 System.arraycopy(children, end, children, start, childrenCount - end); 3304 3305 for (int i = childrenCount - (end - start); i < childrenCount; i++) { 3306 children[i] = null; 3307 } 3308 } 3309 3310 mChildrenCount -= (end - start); 3311 } 3312 3313 private void bindLayoutAnimation(View child) { 3314 Animation a = mLayoutAnimationController.getAnimationForView(child); 3315 child.setAnimation(a); 3316 } 3317 3318 /** 3319 * Subclasses should override this method to set layout animation 3320 * parameters on the supplied child. 3321 * 3322 * @param child the child to associate with animation parameters 3323 * @param params the child's layout parameters which hold the animation 3324 * parameters 3325 * @param index the index of the child in the view group 3326 * @param count the number of children in the view group 3327 */ 3328 protected void attachLayoutAnimationParameters(View child, 3329 LayoutParams params, int index, int count) { 3330 LayoutAnimationController.AnimationParameters animationParams = 3331 params.layoutAnimationParameters; 3332 if (animationParams == null) { 3333 animationParams = new LayoutAnimationController.AnimationParameters(); 3334 params.layoutAnimationParameters = animationParams; 3335 } 3336 3337 animationParams.count = count; 3338 animationParams.index = index; 3339 } 3340 3341 /** 3342 * {@inheritDoc} 3343 */ 3344 public void removeView(View view) { 3345 removeViewInternal(view); 3346 requestLayout(); 3347 invalidate(true); 3348 } 3349 3350 /** 3351 * Removes a view during layout. This is useful if in your onLayout() method, 3352 * you need to remove more views. 3353 * 3354 * @param view the view to remove from the group 3355 */ 3356 public void removeViewInLayout(View view) { 3357 removeViewInternal(view); 3358 } 3359 3360 /** 3361 * Removes a range of views during layout. This is useful if in your onLayout() method, 3362 * you need to remove more views. 3363 * 3364 * @param start the index of the first view to remove from the group 3365 * @param count the number of views to remove from the group 3366 */ 3367 public void removeViewsInLayout(int start, int count) { 3368 removeViewsInternal(start, count); 3369 } 3370 3371 /** 3372 * Removes the view at the specified position in the group. 3373 * 3374 * @param index the position in the group of the view to remove 3375 */ 3376 public void removeViewAt(int index) { 3377 removeViewInternal(index, getChildAt(index)); 3378 requestLayout(); 3379 invalidate(true); 3380 } 3381 3382 /** 3383 * Removes the specified range of views from the group. 3384 * 3385 * @param start the first position in the group of the range of views to remove 3386 * @param count the number of views to remove 3387 */ 3388 public void removeViews(int start, int count) { 3389 removeViewsInternal(start, count); 3390 requestLayout(); 3391 invalidate(true); 3392 } 3393 3394 private void removeViewInternal(View view) { 3395 final int index = indexOfChild(view); 3396 if (index >= 0) { 3397 removeViewInternal(index, view); 3398 } 3399 } 3400 3401 private void removeViewInternal(int index, View view) { 3402 3403 if (mTransition != null) { 3404 mTransition.removeChild(this, view); 3405 } 3406 3407 if (view == mHoveredChild) { 3408 mHoveredChild = null; 3409 } 3410 3411 boolean clearChildFocus = false; 3412 if (view == mFocused) { 3413 view.clearFocusForRemoval(); 3414 clearChildFocus = true; 3415 } 3416 3417 if (view.getAnimation() != null || 3418 (mTransitioningViews != null && mTransitioningViews.contains(view))) { 3419 addDisappearingView(view); 3420 } else if (view.mAttachInfo != null) { 3421 view.dispatchDetachedFromWindow(); 3422 } 3423 3424 if (mOnHierarchyChangeListener != null) { 3425 mOnHierarchyChangeListener.onChildViewRemoved(this, view); 3426 } 3427 3428 needGlobalAttributesUpdate(false); 3429 3430 removeFromArray(index); 3431 3432 if (clearChildFocus) { 3433 clearChildFocus(view); 3434 } 3435 } 3436 3437 /** 3438 * Sets the LayoutTransition object for this ViewGroup. If the LayoutTransition object is 3439 * not null, changes in layout which occur because of children being added to or removed from 3440 * the ViewGroup will be animated according to the animations defined in that LayoutTransition 3441 * object. By default, the transition object is null (so layout changes are not animated). 3442 * 3443 * @param transition The LayoutTransition object that will animated changes in layout. A value 3444 * of <code>null</code> means no transition will run on layout changes. 3445 * @attr ref android.R.styleable#ViewGroup_animateLayoutChanges 3446 */ 3447 public void setLayoutTransition(LayoutTransition transition) { 3448 if (mTransition != null) { 3449 mTransition.removeTransitionListener(mLayoutTransitionListener); 3450 } 3451 mTransition = transition; 3452 if (mTransition != null) { 3453 mTransition.addTransitionListener(mLayoutTransitionListener); 3454 } 3455 } 3456 3457 /** 3458 * Gets the LayoutTransition object for this ViewGroup. If the LayoutTransition object is 3459 * not null, changes in layout which occur because of children being added to or removed from 3460 * the ViewGroup will be animated according to the animations defined in that LayoutTransition 3461 * object. By default, the transition object is null (so layout changes are not animated). 3462 * 3463 * @return LayoutTranstion The LayoutTransition object that will animated changes in layout. 3464 * A value of <code>null</code> means no transition will run on layout changes. 3465 */ 3466 public LayoutTransition getLayoutTransition() { 3467 return mTransition; 3468 } 3469 3470 private void removeViewsInternal(int start, int count) { 3471 final OnHierarchyChangeListener onHierarchyChangeListener = mOnHierarchyChangeListener; 3472 final boolean notifyListener = onHierarchyChangeListener != null; 3473 final View focused = mFocused; 3474 final View hoveredChild = mHoveredChild; 3475 final boolean detach = mAttachInfo != null; 3476 View clearChildFocus = null; 3477 3478 final View[] children = mChildren; 3479 final int end = start + count; 3480 3481 for (int i = start; i < end; i++) { 3482 final View view = children[i]; 3483 3484 if (mTransition != null) { 3485 mTransition.removeChild(this, view); 3486 } 3487 3488 if (view == hoveredChild) { 3489 mHoveredChild = null; 3490 } 3491 3492 if (view == focused) { 3493 view.clearFocusForRemoval(); 3494 clearChildFocus = view; 3495 } 3496 3497 if (view.getAnimation() != null || 3498 (mTransitioningViews != null && mTransitioningViews.contains(view))) { 3499 addDisappearingView(view); 3500 } else if (detach) { 3501 view.dispatchDetachedFromWindow(); 3502 } 3503 3504 needGlobalAttributesUpdate(false); 3505 3506 if (notifyListener) { 3507 onHierarchyChangeListener.onChildViewRemoved(this, view); 3508 } 3509 } 3510 3511 removeFromArray(start, count); 3512 3513 if (clearChildFocus != null) { 3514 clearChildFocus(clearChildFocus); 3515 } 3516 } 3517 3518 /** 3519 * Call this method to remove all child views from the 3520 * ViewGroup. 3521 */ 3522 public void removeAllViews() { 3523 removeAllViewsInLayout(); 3524 requestLayout(); 3525 invalidate(true); 3526 } 3527 3528 /** 3529 * Called by a ViewGroup subclass to remove child views from itself, 3530 * when it must first know its size on screen before it can calculate how many 3531 * child views it will render. An example is a Gallery or a ListView, which 3532 * may "have" 50 children, but actually only render the number of children 3533 * that can currently fit inside the object on screen. Do not call 3534 * this method unless you are extending ViewGroup and understand the 3535 * view measuring and layout pipeline. 3536 */ 3537 public void removeAllViewsInLayout() { 3538 final int count = mChildrenCount; 3539 if (count <= 0) { 3540 return; 3541 } 3542 3543 final View[] children = mChildren; 3544 mChildrenCount = 0; 3545 3546 final OnHierarchyChangeListener listener = mOnHierarchyChangeListener; 3547 final boolean notify = listener != null; 3548 final View focused = mFocused; 3549 final View hoveredChild = mHoveredChild; 3550 final boolean detach = mAttachInfo != null; 3551 View clearChildFocus = null; 3552 3553 needGlobalAttributesUpdate(false); 3554 3555 for (int i = count - 1; i >= 0; i--) { 3556 final View view = children[i]; 3557 3558 if (mTransition != null) { 3559 mTransition.removeChild(this, view); 3560 } 3561 3562 if (view == hoveredChild) { 3563 mHoveredChild = null; 3564 } 3565 3566 if (view == focused) { 3567 view.clearFocusForRemoval(); 3568 clearChildFocus = view; 3569 } 3570 3571 if (view.getAnimation() != null || 3572 (mTransitioningViews != null && mTransitioningViews.contains(view))) { 3573 addDisappearingView(view); 3574 } else if (detach) { 3575 view.dispatchDetachedFromWindow(); 3576 } 3577 3578 if (notify) { 3579 listener.onChildViewRemoved(this, view); 3580 } 3581 3582 view.mParent = null; 3583 children[i] = null; 3584 } 3585 3586 if (clearChildFocus != null) { 3587 clearChildFocus(clearChildFocus); 3588 } 3589 } 3590 3591 /** 3592 * Finishes the removal of a detached view. This method will dispatch the detached from 3593 * window event and notify the hierarchy change listener. 3594 * 3595 * @param child the child to be definitely removed from the view hierarchy 3596 * @param animate if true and the view has an animation, the view is placed in the 3597 * disappearing views list, otherwise, it is detached from the window 3598 * 3599 * @see #attachViewToParent(View, int, android.view.ViewGroup.LayoutParams) 3600 * @see #detachAllViewsFromParent() 3601 * @see #detachViewFromParent(View) 3602 * @see #detachViewFromParent(int) 3603 */ 3604 protected void removeDetachedView(View child, boolean animate) { 3605 if (mTransition != null) { 3606 mTransition.removeChild(this, child); 3607 } 3608 3609 if (child == mFocused) { 3610 child.clearFocus(); 3611 } 3612 3613 if ((animate && child.getAnimation() != null) || 3614 (mTransitioningViews != null && mTransitioningViews.contains(child))) { 3615 addDisappearingView(child); 3616 } else if (child.mAttachInfo != null) { 3617 child.dispatchDetachedFromWindow(); 3618 } 3619 3620 if (mOnHierarchyChangeListener != null) { 3621 mOnHierarchyChangeListener.onChildViewRemoved(this, child); 3622 } 3623 } 3624 3625 /** 3626 * Attaches a view to this view group. Attaching a view assigns this group as the parent, 3627 * sets the layout parameters and puts the view in the list of children so it can be retrieved 3628 * by calling {@link #getChildAt(int)}. 3629 * 3630 * This method should be called only for view which were detached from their parent. 3631 * 3632 * @param child the child to attach 3633 * @param index the index at which the child should be attached 3634 * @param params the layout parameters of the child 3635 * 3636 * @see #removeDetachedView(View, boolean) 3637 * @see #detachAllViewsFromParent() 3638 * @see #detachViewFromParent(View) 3639 * @see #detachViewFromParent(int) 3640 */ 3641 protected void attachViewToParent(View child, int index, LayoutParams params) { 3642 child.mLayoutParams = params; 3643 3644 if (index < 0) { 3645 index = mChildrenCount; 3646 } 3647 3648 addInArray(child, index); 3649 3650 child.mParent = this; 3651 child.mPrivateFlags = (child.mPrivateFlags & ~DIRTY_MASK & ~DRAWING_CACHE_VALID) | 3652 DRAWN | INVALIDATED; 3653 this.mPrivateFlags |= INVALIDATED; 3654 3655 if (child.hasFocus()) { 3656 requestChildFocus(child, child.findFocus()); 3657 } 3658 } 3659 3660 /** 3661 * Detaches a view from its parent. Detaching a view should be temporary and followed 3662 * either by a call to {@link #attachViewToParent(View, int, android.view.ViewGroup.LayoutParams)} 3663 * or a call to {@link #removeDetachedView(View, boolean)}. When a view is detached, 3664 * its parent is null and cannot be retrieved by a call to {@link #getChildAt(int)}. 3665 * 3666 * @param child the child to detach 3667 * 3668 * @see #detachViewFromParent(int) 3669 * @see #detachViewsFromParent(int, int) 3670 * @see #detachAllViewsFromParent() 3671 * @see #attachViewToParent(View, int, android.view.ViewGroup.LayoutParams) 3672 * @see #removeDetachedView(View, boolean) 3673 */ 3674 protected void detachViewFromParent(View child) { 3675 removeFromArray(indexOfChild(child)); 3676 } 3677 3678 /** 3679 * Detaches a view from its parent. Detaching a view should be temporary and followed 3680 * either by a call to {@link #attachViewToParent(View, int, android.view.ViewGroup.LayoutParams)} 3681 * or a call to {@link #removeDetachedView(View, boolean)}. When a view is detached, 3682 * its parent is null and cannot be retrieved by a call to {@link #getChildAt(int)}. 3683 * 3684 * @param index the index of the child to detach 3685 * 3686 * @see #detachViewFromParent(View) 3687 * @see #detachAllViewsFromParent() 3688 * @see #detachViewsFromParent(int, int) 3689 * @see #attachViewToParent(View, int, android.view.ViewGroup.LayoutParams) 3690 * @see #removeDetachedView(View, boolean) 3691 */ 3692 protected void detachViewFromParent(int index) { 3693 removeFromArray(index); 3694 } 3695 3696 /** 3697 * Detaches a range of view from their parent. Detaching a view should be temporary and followed 3698 * either by a call to {@link #attachViewToParent(View, int, android.view.ViewGroup.LayoutParams)} 3699 * or a call to {@link #removeDetachedView(View, boolean)}. When a view is detached, its 3700 * parent is null and cannot be retrieved by a call to {@link #getChildAt(int)}. 3701 * 3702 * @param start the first index of the childrend range to detach 3703 * @param count the number of children to detach 3704 * 3705 * @see #detachViewFromParent(View) 3706 * @see #detachViewFromParent(int) 3707 * @see #detachAllViewsFromParent() 3708 * @see #attachViewToParent(View, int, android.view.ViewGroup.LayoutParams) 3709 * @see #removeDetachedView(View, boolean) 3710 */ 3711 protected void detachViewsFromParent(int start, int count) { 3712 removeFromArray(start, count); 3713 } 3714 3715 /** 3716 * Detaches all views from the parent. Detaching a view should be temporary and followed 3717 * either by a call to {@link #attachViewToParent(View, int, android.view.ViewGroup.LayoutParams)} 3718 * or a call to {@link #removeDetachedView(View, boolean)}. When a view is detached, 3719 * its parent is null and cannot be retrieved by a call to {@link #getChildAt(int)}. 3720 * 3721 * @see #detachViewFromParent(View) 3722 * @see #detachViewFromParent(int) 3723 * @see #detachViewsFromParent(int, int) 3724 * @see #attachViewToParent(View, int, android.view.ViewGroup.LayoutParams) 3725 * @see #removeDetachedView(View, boolean) 3726 */ 3727 protected void detachAllViewsFromParent() { 3728 final int count = mChildrenCount; 3729 if (count <= 0) { 3730 return; 3731 } 3732 3733 final View[] children = mChildren; 3734 mChildrenCount = 0; 3735 3736 for (int i = count - 1; i >= 0; i--) { 3737 children[i].mParent = null; 3738 children[i] = null; 3739 } 3740 } 3741 3742 /** 3743 * Don't call or override this method. It is used for the implementation of 3744 * the view hierarchy. 3745 */ 3746 public final void invalidateChild(View child, final Rect dirty) { 3747 if (ViewDebug.TRACE_HIERARCHY) { 3748 ViewDebug.trace(this, ViewDebug.HierarchyTraceType.INVALIDATE_CHILD); 3749 } 3750 3751 ViewParent parent = this; 3752 3753 final AttachInfo attachInfo = mAttachInfo; 3754 if (attachInfo != null) { 3755 // If the child is drawing an animation, we want to copy this flag onto 3756 // ourselves and the parent to make sure the invalidate request goes 3757 // through 3758 final boolean drawAnimation = (child.mPrivateFlags & DRAW_ANIMATION) == DRAW_ANIMATION; 3759 3760 if (dirty == null) { 3761 if (child.mLayerType != LAYER_TYPE_NONE) { 3762 mPrivateFlags |= INVALIDATED; 3763 mPrivateFlags &= ~DRAWING_CACHE_VALID; 3764 child.mLocalDirtyRect.setEmpty(); 3765 } 3766 do { 3767 View view = null; 3768 if (parent instanceof View) { 3769 view = (View) parent; 3770 if (view.mLayerType != LAYER_TYPE_NONE) { 3771 view.mLocalDirtyRect.setEmpty(); 3772 if (view.getParent() instanceof View) { 3773 final View grandParent = (View) view.getParent(); 3774 grandParent.mPrivateFlags |= INVALIDATED; 3775 grandParent.mPrivateFlags &= ~DRAWING_CACHE_VALID; 3776 } 3777 } 3778 if ((view.mPrivateFlags & DIRTY_MASK) != 0) { 3779 // already marked dirty - we're done 3780 break; 3781 } 3782 } 3783 3784 if (drawAnimation) { 3785 if (view != null) { 3786 view.mPrivateFlags |= DRAW_ANIMATION; 3787 } else if (parent instanceof ViewRoot) { 3788 ((ViewRoot) parent).mIsAnimating = true; 3789 } 3790 } 3791 3792 if (parent instanceof ViewRoot) { 3793 ((ViewRoot) parent).invalidate(); 3794 parent = null; 3795 } else if (view != null) { 3796 if ((view.mPrivateFlags & DRAWN) == DRAWN || 3797 (view.mPrivateFlags & DRAWING_CACHE_VALID) == DRAWING_CACHE_VALID) { 3798 view.mPrivateFlags &= ~DRAWING_CACHE_VALID; 3799 view.mPrivateFlags |= DIRTY; 3800 parent = view.mParent; 3801 } else { 3802 parent = null; 3803 } 3804 } 3805 } while (parent != null); 3806 } else { 3807 // Check whether the child that requests the invalidate is fully opaque 3808 final boolean isOpaque = child.isOpaque() && !drawAnimation && 3809 child.getAnimation() == null; 3810 // Mark the child as dirty, using the appropriate flag 3811 // Make sure we do not set both flags at the same time 3812 int opaqueFlag = isOpaque ? DIRTY_OPAQUE : DIRTY; 3813 3814 if (child.mLayerType != LAYER_TYPE_NONE) { 3815 mPrivateFlags |= INVALIDATED; 3816 mPrivateFlags &= ~DRAWING_CACHE_VALID; 3817 child.mLocalDirtyRect.union(dirty); 3818 } 3819 3820 final int[] location = attachInfo.mInvalidateChildLocation; 3821 location[CHILD_LEFT_INDEX] = child.mLeft; 3822 location[CHILD_TOP_INDEX] = child.mTop; 3823 Matrix childMatrix = child.getMatrix(); 3824 if (!childMatrix.isIdentity()) { 3825 RectF boundingRect = attachInfo.mTmpTransformRect; 3826 boundingRect.set(dirty); 3827 childMatrix.mapRect(boundingRect); 3828 dirty.set((int) boundingRect.left, (int) boundingRect.top, 3829 (int) (boundingRect.right + 0.5f), 3830 (int) (boundingRect.bottom + 0.5f)); 3831 } 3832 3833 do { 3834 View view = null; 3835 if (parent instanceof View) { 3836 view = (View) parent; 3837 if (view.mLayerType != LAYER_TYPE_NONE && 3838 view.getParent() instanceof View) { 3839 final View grandParent = (View) view.getParent(); 3840 grandParent.mPrivateFlags |= INVALIDATED; 3841 grandParent.mPrivateFlags &= ~DRAWING_CACHE_VALID; 3842 } 3843 } 3844 3845 if (drawAnimation) { 3846 if (view != null) { 3847 view.mPrivateFlags |= DRAW_ANIMATION; 3848 } else if (parent instanceof ViewRoot) { 3849 ((ViewRoot) parent).mIsAnimating = true; 3850 } 3851 } 3852 3853 // If the parent is dirty opaque or not dirty, mark it dirty with the opaque 3854 // flag coming from the child that initiated the invalidate 3855 if (view != null) { 3856 if ((view.mViewFlags & FADING_EDGE_MASK) != 0 && 3857 view.getSolidColor() == 0) { 3858 opaqueFlag = DIRTY; 3859 } 3860 if ((view.mPrivateFlags & DIRTY_MASK) != DIRTY) { 3861 view.mPrivateFlags = (view.mPrivateFlags & ~DIRTY_MASK) | opaqueFlag; 3862 } 3863 } 3864 3865 parent = parent.invalidateChildInParent(location, dirty); 3866 if (view != null) { 3867 // Account for transform on current parent 3868 Matrix m = view.getMatrix(); 3869 if (!m.isIdentity()) { 3870 RectF boundingRect = attachInfo.mTmpTransformRect; 3871 boundingRect.set(dirty); 3872 m.mapRect(boundingRect); 3873 dirty.set((int) boundingRect.left, (int) boundingRect.top, 3874 (int) (boundingRect.right + 0.5f), 3875 (int) (boundingRect.bottom + 0.5f)); 3876 } 3877 } 3878 } while (parent != null); 3879 } 3880 } 3881 } 3882 3883 /** 3884 * Don't call or override this method. It is used for the implementation of 3885 * the view hierarchy. 3886 * 3887 * This implementation returns null if this ViewGroup does not have a parent, 3888 * if this ViewGroup is already fully invalidated or if the dirty rectangle 3889 * does not intersect with this ViewGroup's bounds. 3890 */ 3891 public ViewParent invalidateChildInParent(final int[] location, final Rect dirty) { 3892 if (ViewDebug.TRACE_HIERARCHY) { 3893 ViewDebug.trace(this, ViewDebug.HierarchyTraceType.INVALIDATE_CHILD_IN_PARENT); 3894 } 3895 3896 if ((mPrivateFlags & DRAWN) == DRAWN || 3897 (mPrivateFlags & DRAWING_CACHE_VALID) == DRAWING_CACHE_VALID) { 3898 if ((mGroupFlags & (FLAG_OPTIMIZE_INVALIDATE | FLAG_ANIMATION_DONE)) != 3899 FLAG_OPTIMIZE_INVALIDATE) { 3900 dirty.offset(location[CHILD_LEFT_INDEX] - mScrollX, 3901 location[CHILD_TOP_INDEX] - mScrollY); 3902 3903 final int left = mLeft; 3904 final int top = mTop; 3905 3906 if (dirty.intersect(0, 0, mRight - left, mBottom - top) || 3907 (mPrivateFlags & DRAW_ANIMATION) == DRAW_ANIMATION) { 3908 mPrivateFlags &= ~DRAWING_CACHE_VALID; 3909 3910 location[CHILD_LEFT_INDEX] = left; 3911 location[CHILD_TOP_INDEX] = top; 3912 3913 if (mLayerType != LAYER_TYPE_NONE) { 3914 mLocalDirtyRect.union(dirty); 3915 } 3916 3917 return mParent; 3918 } 3919 } else { 3920 mPrivateFlags &= ~DRAWN & ~DRAWING_CACHE_VALID; 3921 3922 location[CHILD_LEFT_INDEX] = mLeft; 3923 location[CHILD_TOP_INDEX] = mTop; 3924 3925 dirty.set(0, 0, mRight - mLeft, mBottom - mTop); 3926 3927 if (mLayerType != LAYER_TYPE_NONE) { 3928 mLocalDirtyRect.union(dirty); 3929 } 3930 3931 return mParent; 3932 } 3933 } 3934 3935 return null; 3936 } 3937 3938 /** 3939 * Offset a rectangle that is in a descendant's coordinate 3940 * space into our coordinate space. 3941 * @param descendant A descendant of this view 3942 * @param rect A rectangle defined in descendant's coordinate space. 3943 */ 3944 public final void offsetDescendantRectToMyCoords(View descendant, Rect rect) { 3945 offsetRectBetweenParentAndChild(descendant, rect, true, false); 3946 } 3947 3948 /** 3949 * Offset a rectangle that is in our coordinate space into an ancestor's 3950 * coordinate space. 3951 * @param descendant A descendant of this view 3952 * @param rect A rectangle defined in descendant's coordinate space. 3953 */ 3954 public final void offsetRectIntoDescendantCoords(View descendant, Rect rect) { 3955 offsetRectBetweenParentAndChild(descendant, rect, false, false); 3956 } 3957 3958 /** 3959 * Helper method that offsets a rect either from parent to descendant or 3960 * descendant to parent. 3961 */ 3962 void offsetRectBetweenParentAndChild(View descendant, Rect rect, 3963 boolean offsetFromChildToParent, boolean clipToBounds) { 3964 3965 // already in the same coord system :) 3966 if (descendant == this) { 3967 return; 3968 } 3969 3970 ViewParent theParent = descendant.mParent; 3971 3972 // search and offset up to the parent 3973 while ((theParent != null) 3974 && (theParent instanceof View) 3975 && (theParent != this)) { 3976 3977 if (offsetFromChildToParent) { 3978 rect.offset(descendant.mLeft - descendant.mScrollX, 3979 descendant.mTop - descendant.mScrollY); 3980 if (clipToBounds) { 3981 View p = (View) theParent; 3982 rect.intersect(0, 0, p.mRight - p.mLeft, p.mBottom - p.mTop); 3983 } 3984 } else { 3985 if (clipToBounds) { 3986 View p = (View) theParent; 3987 rect.intersect(0, 0, p.mRight - p.mLeft, p.mBottom - p.mTop); 3988 } 3989 rect.offset(descendant.mScrollX - descendant.mLeft, 3990 descendant.mScrollY - descendant.mTop); 3991 } 3992 3993 descendant = (View) theParent; 3994 theParent = descendant.mParent; 3995 } 3996 3997 // now that we are up to this view, need to offset one more time 3998 // to get into our coordinate space 3999 if (theParent == this) { 4000 if (offsetFromChildToParent) { 4001 rect.offset(descendant.mLeft - descendant.mScrollX, 4002 descendant.mTop - descendant.mScrollY); 4003 } else { 4004 rect.offset(descendant.mScrollX - descendant.mLeft, 4005 descendant.mScrollY - descendant.mTop); 4006 } 4007 } else { 4008 throw new IllegalArgumentException("parameter must be a descendant of this view"); 4009 } 4010 } 4011 4012 /** 4013 * Offset the vertical location of all children of this view by the specified number of pixels. 4014 * 4015 * @param offset the number of pixels to offset 4016 * 4017 * @hide 4018 */ 4019 public void offsetChildrenTopAndBottom(int offset) { 4020 final int count = mChildrenCount; 4021 final View[] children = mChildren; 4022 4023 for (int i = 0; i < count; i++) { 4024 final View v = children[i]; 4025 v.mTop += offset; 4026 v.mBottom += offset; 4027 } 4028 } 4029 4030 /** 4031 * {@inheritDoc} 4032 */ 4033 public boolean getChildVisibleRect(View child, Rect r, android.graphics.Point offset) { 4034 int dx = child.mLeft - mScrollX; 4035 int dy = child.mTop - mScrollY; 4036 if (offset != null) { 4037 offset.x += dx; 4038 offset.y += dy; 4039 } 4040 r.offset(dx, dy); 4041 return r.intersect(0, 0, mRight - mLeft, mBottom - mTop) && 4042 (mParent == null || mParent.getChildVisibleRect(this, r, offset)); 4043 } 4044 4045 /** 4046 * {@inheritDoc} 4047 */ 4048 @Override 4049 public final void layout(int l, int t, int r, int b) { 4050 if (mTransition == null || !mTransition.isChangingLayout()) { 4051 super.layout(l, t, r, b); 4052 } else { 4053 // record the fact that we noop'd it; request layout when transition finishes 4054 mLayoutSuppressed = true; 4055 } 4056 } 4057 4058 /** 4059 * {@inheritDoc} 4060 */ 4061 @Override 4062 protected abstract void onLayout(boolean changed, 4063 int l, int t, int r, int b); 4064 4065 /** 4066 * Indicates whether the view group has the ability to animate its children 4067 * after the first layout. 4068 * 4069 * @return true if the children can be animated, false otherwise 4070 */ 4071 protected boolean canAnimate() { 4072 return mLayoutAnimationController != null; 4073 } 4074 4075 /** 4076 * Runs the layout animation. Calling this method triggers a relayout of 4077 * this view group. 4078 */ 4079 public void startLayoutAnimation() { 4080 if (mLayoutAnimationController != null) { 4081 mGroupFlags |= FLAG_RUN_ANIMATION; 4082 requestLayout(); 4083 } 4084 } 4085 4086 /** 4087 * Schedules the layout animation to be played after the next layout pass 4088 * of this view group. This can be used to restart the layout animation 4089 * when the content of the view group changes or when the activity is 4090 * paused and resumed. 4091 */ 4092 public void scheduleLayoutAnimation() { 4093 mGroupFlags |= FLAG_RUN_ANIMATION; 4094 } 4095 4096 /** 4097 * Sets the layout animation controller used to animate the group's 4098 * children after the first layout. 4099 * 4100 * @param controller the animation controller 4101 */ 4102 public void setLayoutAnimation(LayoutAnimationController controller) { 4103 mLayoutAnimationController = controller; 4104 if (mLayoutAnimationController != null) { 4105 mGroupFlags |= FLAG_RUN_ANIMATION; 4106 } 4107 } 4108 4109 /** 4110 * Returns the layout animation controller used to animate the group's 4111 * children. 4112 * 4113 * @return the current animation controller 4114 */ 4115 public LayoutAnimationController getLayoutAnimation() { 4116 return mLayoutAnimationController; 4117 } 4118 4119 /** 4120 * Indicates whether the children's drawing cache is used during a layout 4121 * animation. By default, the drawing cache is enabled but this will prevent 4122 * nested layout animations from working. To nest animations, you must disable 4123 * the cache. 4124 * 4125 * @return true if the animation cache is enabled, false otherwise 4126 * 4127 * @see #setAnimationCacheEnabled(boolean) 4128 * @see View#setDrawingCacheEnabled(boolean) 4129 */ 4130 @ViewDebug.ExportedProperty 4131 public boolean isAnimationCacheEnabled() { 4132 return (mGroupFlags & FLAG_ANIMATION_CACHE) == FLAG_ANIMATION_CACHE; 4133 } 4134 4135 /** 4136 * Enables or disables the children's drawing cache during a layout animation. 4137 * By default, the drawing cache is enabled but this will prevent nested 4138 * layout animations from working. To nest animations, you must disable the 4139 * cache. 4140 * 4141 * @param enabled true to enable the animation cache, false otherwise 4142 * 4143 * @see #isAnimationCacheEnabled() 4144 * @see View#setDrawingCacheEnabled(boolean) 4145 */ 4146 public void setAnimationCacheEnabled(boolean enabled) { 4147 setBooleanFlag(FLAG_ANIMATION_CACHE, enabled); 4148 } 4149 4150 /** 4151 * Indicates whether this ViewGroup will always try to draw its children using their 4152 * drawing cache. By default this property is enabled. 4153 * 4154 * @return true if the animation cache is enabled, false otherwise 4155 * 4156 * @see #setAlwaysDrawnWithCacheEnabled(boolean) 4157 * @see #setChildrenDrawnWithCacheEnabled(boolean) 4158 * @see View#setDrawingCacheEnabled(boolean) 4159 */ 4160 @ViewDebug.ExportedProperty(category = "drawing") 4161 public boolean isAlwaysDrawnWithCacheEnabled() { 4162 return (mGroupFlags & FLAG_ALWAYS_DRAWN_WITH_CACHE) == FLAG_ALWAYS_DRAWN_WITH_CACHE; 4163 } 4164 4165 /** 4166 * Indicates whether this ViewGroup will always try to draw its children using their 4167 * drawing cache. This property can be set to true when the cache rendering is 4168 * slightly different from the children's normal rendering. Renderings can be different, 4169 * for instance, when the cache's quality is set to low. 4170 * 4171 * When this property is disabled, the ViewGroup will use the drawing cache of its 4172 * children only when asked to. It's usually the task of subclasses to tell ViewGroup 4173 * when to start using the drawing cache and when to stop using it. 4174 * 4175 * @param always true to always draw with the drawing cache, false otherwise 4176 * 4177 * @see #isAlwaysDrawnWithCacheEnabled() 4178 * @see #setChildrenDrawnWithCacheEnabled(boolean) 4179 * @see View#setDrawingCacheEnabled(boolean) 4180 * @see View#setDrawingCacheQuality(int) 4181 */ 4182 public void setAlwaysDrawnWithCacheEnabled(boolean always) { 4183 setBooleanFlag(FLAG_ALWAYS_DRAWN_WITH_CACHE, always); 4184 } 4185 4186 /** 4187 * Indicates whether the ViewGroup is currently drawing its children using 4188 * their drawing cache. 4189 * 4190 * @return true if children should be drawn with their cache, false otherwise 4191 * 4192 * @see #setAlwaysDrawnWithCacheEnabled(boolean) 4193 * @see #setChildrenDrawnWithCacheEnabled(boolean) 4194 */ 4195 @ViewDebug.ExportedProperty(category = "drawing") 4196 protected boolean isChildrenDrawnWithCacheEnabled() { 4197 return (mGroupFlags & FLAG_CHILDREN_DRAWN_WITH_CACHE) == FLAG_CHILDREN_DRAWN_WITH_CACHE; 4198 } 4199 4200 /** 4201 * Tells the ViewGroup to draw its children using their drawing cache. This property 4202 * is ignored when {@link #isAlwaysDrawnWithCacheEnabled()} is true. A child's drawing cache 4203 * will be used only if it has been enabled. 4204 * 4205 * Subclasses should call this method to start and stop using the drawing cache when 4206 * they perform performance sensitive operations, like scrolling or animating. 4207 * 4208 * @param enabled true if children should be drawn with their cache, false otherwise 4209 * 4210 * @see #setAlwaysDrawnWithCacheEnabled(boolean) 4211 * @see #isChildrenDrawnWithCacheEnabled() 4212 */ 4213 protected void setChildrenDrawnWithCacheEnabled(boolean enabled) { 4214 setBooleanFlag(FLAG_CHILDREN_DRAWN_WITH_CACHE, enabled); 4215 } 4216 4217 /** 4218 * Indicates whether the ViewGroup is drawing its children in the order defined by 4219 * {@link #getChildDrawingOrder(int, int)}. 4220 * 4221 * @return true if children drawing order is defined by {@link #getChildDrawingOrder(int, int)}, 4222 * false otherwise 4223 * 4224 * @see #setChildrenDrawingOrderEnabled(boolean) 4225 * @see #getChildDrawingOrder(int, int) 4226 */ 4227 @ViewDebug.ExportedProperty(category = "drawing") 4228 protected boolean isChildrenDrawingOrderEnabled() { 4229 return (mGroupFlags & FLAG_USE_CHILD_DRAWING_ORDER) == FLAG_USE_CHILD_DRAWING_ORDER; 4230 } 4231 4232 /** 4233 * Tells the ViewGroup whether to draw its children in the order defined by the method 4234 * {@link #getChildDrawingOrder(int, int)}. 4235 * 4236 * @param enabled true if the order of the children when drawing is determined by 4237 * {@link #getChildDrawingOrder(int, int)}, false otherwise 4238 * 4239 * @see #isChildrenDrawingOrderEnabled() 4240 * @see #getChildDrawingOrder(int, int) 4241 */ 4242 protected void setChildrenDrawingOrderEnabled(boolean enabled) { 4243 setBooleanFlag(FLAG_USE_CHILD_DRAWING_ORDER, enabled); 4244 } 4245 4246 private void setBooleanFlag(int flag, boolean value) { 4247 if (value) { 4248 mGroupFlags |= flag; 4249 } else { 4250 mGroupFlags &= ~flag; 4251 } 4252 } 4253 4254 /** 4255 * Returns an integer indicating what types of drawing caches are kept in memory. 4256 * 4257 * @see #setPersistentDrawingCache(int) 4258 * @see #setAnimationCacheEnabled(boolean) 4259 * 4260 * @return one or a combination of {@link #PERSISTENT_NO_CACHE}, 4261 * {@link #PERSISTENT_ANIMATION_CACHE}, {@link #PERSISTENT_SCROLLING_CACHE} 4262 * and {@link #PERSISTENT_ALL_CACHES} 4263 */ 4264 @ViewDebug.ExportedProperty(category = "drawing", mapping = { 4265 @ViewDebug.IntToString(from = PERSISTENT_NO_CACHE, to = "NONE"), 4266 @ViewDebug.IntToString(from = PERSISTENT_ANIMATION_CACHE, to = "ANIMATION"), 4267 @ViewDebug.IntToString(from = PERSISTENT_SCROLLING_CACHE, to = "SCROLLING"), 4268 @ViewDebug.IntToString(from = PERSISTENT_ALL_CACHES, to = "ALL") 4269 }) 4270 public int getPersistentDrawingCache() { 4271 return mPersistentDrawingCache; 4272 } 4273 4274 /** 4275 * Indicates what types of drawing caches should be kept in memory after 4276 * they have been created. 4277 * 4278 * @see #getPersistentDrawingCache() 4279 * @see #setAnimationCacheEnabled(boolean) 4280 * 4281 * @param drawingCacheToKeep one or a combination of {@link #PERSISTENT_NO_CACHE}, 4282 * {@link #PERSISTENT_ANIMATION_CACHE}, {@link #PERSISTENT_SCROLLING_CACHE} 4283 * and {@link #PERSISTENT_ALL_CACHES} 4284 */ 4285 public void setPersistentDrawingCache(int drawingCacheToKeep) { 4286 mPersistentDrawingCache = drawingCacheToKeep & PERSISTENT_ALL_CACHES; 4287 } 4288 4289 /** 4290 * Returns a new set of layout parameters based on the supplied attributes set. 4291 * 4292 * @param attrs the attributes to build the layout parameters from 4293 * 4294 * @return an instance of {@link android.view.ViewGroup.LayoutParams} or one 4295 * of its descendants 4296 */ 4297 public LayoutParams generateLayoutParams(AttributeSet attrs) { 4298 return new LayoutParams(getContext(), attrs); 4299 } 4300 4301 /** 4302 * Returns a safe set of layout parameters based on the supplied layout params. 4303 * When a ViewGroup is passed a View whose layout params do not pass the test of 4304 * {@link #checkLayoutParams(android.view.ViewGroup.LayoutParams)}, this method 4305 * is invoked. This method should return a new set of layout params suitable for 4306 * this ViewGroup, possibly by copying the appropriate attributes from the 4307 * specified set of layout params. 4308 * 4309 * @param p The layout parameters to convert into a suitable set of layout parameters 4310 * for this ViewGroup. 4311 * 4312 * @return an instance of {@link android.view.ViewGroup.LayoutParams} or one 4313 * of its descendants 4314 */ 4315 protected LayoutParams generateLayoutParams(ViewGroup.LayoutParams p) { 4316 return p; 4317 } 4318 4319 /** 4320 * Returns a set of default layout parameters. These parameters are requested 4321 * when the View passed to {@link #addView(View)} has no layout parameters 4322 * already set. If null is returned, an exception is thrown from addView. 4323 * 4324 * @return a set of default layout parameters or null 4325 */ 4326 protected LayoutParams generateDefaultLayoutParams() { 4327 return new LayoutParams(LayoutParams.WRAP_CONTENT, LayoutParams.WRAP_CONTENT); 4328 } 4329 4330 /** 4331 * @hide 4332 */ 4333 @Override 4334 protected boolean dispatchConsistencyCheck(int consistency) { 4335 boolean result = super.dispatchConsistencyCheck(consistency); 4336 4337 final int count = mChildrenCount; 4338 final View[] children = mChildren; 4339 for (int i = 0; i < count; i++) { 4340 if (!children[i].dispatchConsistencyCheck(consistency)) result = false; 4341 } 4342 4343 return result; 4344 } 4345 4346 /** 4347 * @hide 4348 */ 4349 @Override 4350 protected boolean onConsistencyCheck(int consistency) { 4351 boolean result = super.onConsistencyCheck(consistency); 4352 4353 final boolean checkLayout = (consistency & ViewDebug.CONSISTENCY_LAYOUT) != 0; 4354 final boolean checkDrawing = (consistency & ViewDebug.CONSISTENCY_DRAWING) != 0; 4355 4356 if (checkLayout) { 4357 final int count = mChildrenCount; 4358 final View[] children = mChildren; 4359 for (int i = 0; i < count; i++) { 4360 if (children[i].getParent() != this) { 4361 result = false; 4362 android.util.Log.d(ViewDebug.CONSISTENCY_LOG_TAG, 4363 "View " + children[i] + " has no parent/a parent that is not " + this); 4364 } 4365 } 4366 } 4367 4368 if (checkDrawing) { 4369 // If this group is dirty, check that the parent is dirty as well 4370 if ((mPrivateFlags & DIRTY_MASK) != 0) { 4371 final ViewParent parent = getParent(); 4372 if (parent != null && !(parent instanceof ViewRoot)) { 4373 if ((((View) parent).mPrivateFlags & DIRTY_MASK) == 0) { 4374 result = false; 4375 android.util.Log.d(ViewDebug.CONSISTENCY_LOG_TAG, 4376 "ViewGroup " + this + " is dirty but its parent is not: " + this); 4377 } 4378 } 4379 } 4380 } 4381 4382 return result; 4383 } 4384 4385 /** 4386 * {@inheritDoc} 4387 */ 4388 @Override 4389 protected void debug(int depth) { 4390 super.debug(depth); 4391 String output; 4392 4393 if (mFocused != null) { 4394 output = debugIndent(depth); 4395 output += "mFocused"; 4396 Log.d(VIEW_LOG_TAG, output); 4397 } 4398 if (mChildrenCount != 0) { 4399 output = debugIndent(depth); 4400 output += "{"; 4401 Log.d(VIEW_LOG_TAG, output); 4402 } 4403 int count = mChildrenCount; 4404 for (int i = 0; i < count; i++) { 4405 View child = mChildren[i]; 4406 child.debug(depth + 1); 4407 } 4408 4409 if (mChildrenCount != 0) { 4410 output = debugIndent(depth); 4411 output += "}"; 4412 Log.d(VIEW_LOG_TAG, output); 4413 } 4414 } 4415 4416 /** 4417 * Returns the position in the group of the specified child view. 4418 * 4419 * @param child the view for which to get the position 4420 * @return a positive integer representing the position of the view in the 4421 * group, or -1 if the view does not exist in the group 4422 */ 4423 public int indexOfChild(View child) { 4424 final int count = mChildrenCount; 4425 final View[] children = mChildren; 4426 for (int i = 0; i < count; i++) { 4427 if (children[i] == child) { 4428 return i; 4429 } 4430 } 4431 return -1; 4432 } 4433 4434 /** 4435 * Returns the number of children in the group. 4436 * 4437 * @return a positive integer representing the number of children in 4438 * the group 4439 */ 4440 public int getChildCount() { 4441 return mChildrenCount; 4442 } 4443 4444 /** 4445 * Returns the view at the specified position in the group. 4446 * 4447 * @param index the position at which to get the view from 4448 * @return the view at the specified position or null if the position 4449 * does not exist within the group 4450 */ 4451 public View getChildAt(int index) { 4452 if (index < 0 || index >= mChildrenCount) { 4453 return null; 4454 } 4455 return mChildren[index]; 4456 } 4457 4458 /** 4459 * Ask all of the children of this view to measure themselves, taking into 4460 * account both the MeasureSpec requirements for this view and its padding. 4461 * We skip children that are in the GONE state The heavy lifting is done in 4462 * getChildMeasureSpec. 4463 * 4464 * @param widthMeasureSpec The width requirements for this view 4465 * @param heightMeasureSpec The height requirements for this view 4466 */ 4467 protected void measureChildren(int widthMeasureSpec, int heightMeasureSpec) { 4468 final int size = mChildrenCount; 4469 final View[] children = mChildren; 4470 for (int i = 0; i < size; ++i) { 4471 final View child = children[i]; 4472 if ((child.mViewFlags & VISIBILITY_MASK) != GONE) { 4473 measureChild(child, widthMeasureSpec, heightMeasureSpec); 4474 } 4475 } 4476 } 4477 4478 /** 4479 * Ask one of the children of this view to measure itself, taking into 4480 * account both the MeasureSpec requirements for this view and its padding. 4481 * The heavy lifting is done in getChildMeasureSpec. 4482 * 4483 * @param child The child to measure 4484 * @param parentWidthMeasureSpec The width requirements for this view 4485 * @param parentHeightMeasureSpec The height requirements for this view 4486 */ 4487 protected void measureChild(View child, int parentWidthMeasureSpec, 4488 int parentHeightMeasureSpec) { 4489 final LayoutParams lp = child.getLayoutParams(); 4490 4491 final int childWidthMeasureSpec = getChildMeasureSpec(parentWidthMeasureSpec, 4492 mPaddingLeft + mPaddingRight, lp.width); 4493 final int childHeightMeasureSpec = getChildMeasureSpec(parentHeightMeasureSpec, 4494 mPaddingTop + mPaddingBottom, lp.height); 4495 4496 child.measure(childWidthMeasureSpec, childHeightMeasureSpec); 4497 } 4498 4499 /** 4500 * Ask one of the children of this view to measure itself, taking into 4501 * account both the MeasureSpec requirements for this view and its padding 4502 * and margins. The child must have MarginLayoutParams The heavy lifting is 4503 * done in getChildMeasureSpec. 4504 * 4505 * @param child The child to measure 4506 * @param parentWidthMeasureSpec The width requirements for this view 4507 * @param widthUsed Extra space that has been used up by the parent 4508 * horizontally (possibly by other children of the parent) 4509 * @param parentHeightMeasureSpec The height requirements for this view 4510 * @param heightUsed Extra space that has been used up by the parent 4511 * vertically (possibly by other children of the parent) 4512 */ 4513 protected void measureChildWithMargins(View child, 4514 int parentWidthMeasureSpec, int widthUsed, 4515 int parentHeightMeasureSpec, int heightUsed) { 4516 final MarginLayoutParams lp = (MarginLayoutParams) child.getLayoutParams(); 4517 4518 final int childWidthMeasureSpec = getChildMeasureSpec(parentWidthMeasureSpec, 4519 mPaddingLeft + mPaddingRight + lp.leftMargin + lp.rightMargin 4520 + widthUsed, lp.width); 4521 final int childHeightMeasureSpec = getChildMeasureSpec(parentHeightMeasureSpec, 4522 mPaddingTop + mPaddingBottom + lp.topMargin + lp.bottomMargin 4523 + heightUsed, lp.height); 4524 4525 child.measure(childWidthMeasureSpec, childHeightMeasureSpec); 4526 } 4527 4528 /** 4529 * Does the hard part of measureChildren: figuring out the MeasureSpec to 4530 * pass to a particular child. This method figures out the right MeasureSpec 4531 * for one dimension (height or width) of one child view. 4532 * 4533 * The goal is to combine information from our MeasureSpec with the 4534 * LayoutParams of the child to get the best possible results. For example, 4535 * if the this view knows its size (because its MeasureSpec has a mode of 4536 * EXACTLY), and the child has indicated in its LayoutParams that it wants 4537 * to be the same size as the parent, the parent should ask the child to 4538 * layout given an exact size. 4539 * 4540 * @param spec The requirements for this view 4541 * @param padding The padding of this view for the current dimension and 4542 * margins, if applicable 4543 * @param childDimension How big the child wants to be in the current 4544 * dimension 4545 * @return a MeasureSpec integer for the child 4546 */ 4547 public static int getChildMeasureSpec(int spec, int padding, int childDimension) { 4548 int specMode = MeasureSpec.getMode(spec); 4549 int specSize = MeasureSpec.getSize(spec); 4550 4551 int size = Math.max(0, specSize - padding); 4552 4553 int resultSize = 0; 4554 int resultMode = 0; 4555 4556 switch (specMode) { 4557 // Parent has imposed an exact size on us 4558 case MeasureSpec.EXACTLY: 4559 if (childDimension >= 0) { 4560 resultSize = childDimension; 4561 resultMode = MeasureSpec.EXACTLY; 4562 } else if (childDimension == LayoutParams.MATCH_PARENT) { 4563 // Child wants to be our size. So be it. 4564 resultSize = size; 4565 resultMode = MeasureSpec.EXACTLY; 4566 } else if (childDimension == LayoutParams.WRAP_CONTENT) { 4567 // Child wants to determine its own size. It can't be 4568 // bigger than us. 4569 resultSize = size; 4570 resultMode = MeasureSpec.AT_MOST; 4571 } 4572 break; 4573 4574 // Parent has imposed a maximum size on us 4575 case MeasureSpec.AT_MOST: 4576 if (childDimension >= 0) { 4577 // Child wants a specific size... so be it 4578 resultSize = childDimension; 4579 resultMode = MeasureSpec.EXACTLY; 4580 } else if (childDimension == LayoutParams.MATCH_PARENT) { 4581 // Child wants to be our size, but our size is not fixed. 4582 // Constrain child to not be bigger than us. 4583 resultSize = size; 4584 resultMode = MeasureSpec.AT_MOST; 4585 } else if (childDimension == LayoutParams.WRAP_CONTENT) { 4586 // Child wants to determine its own size. It can't be 4587 // bigger than us. 4588 resultSize = size; 4589 resultMode = MeasureSpec.AT_MOST; 4590 } 4591 break; 4592 4593 // Parent asked to see how big we want to be 4594 case MeasureSpec.UNSPECIFIED: 4595 if (childDimension >= 0) { 4596 // Child wants a specific size... let him have it 4597 resultSize = childDimension; 4598 resultMode = MeasureSpec.EXACTLY; 4599 } else if (childDimension == LayoutParams.MATCH_PARENT) { 4600 // Child wants to be our size... find out how big it should 4601 // be 4602 resultSize = 0; 4603 resultMode = MeasureSpec.UNSPECIFIED; 4604 } else if (childDimension == LayoutParams.WRAP_CONTENT) { 4605 // Child wants to determine its own size.... find out how 4606 // big it should be 4607 resultSize = 0; 4608 resultMode = MeasureSpec.UNSPECIFIED; 4609 } 4610 break; 4611 } 4612 return MeasureSpec.makeMeasureSpec(resultSize, resultMode); 4613 } 4614 4615 4616 /** 4617 * Removes any pending animations for views that have been removed. Call 4618 * this if you don't want animations for exiting views to stack up. 4619 */ 4620 public void clearDisappearingChildren() { 4621 if (mDisappearingChildren != null) { 4622 mDisappearingChildren.clear(); 4623 } 4624 } 4625 4626 /** 4627 * Add a view which is removed from mChildren but still needs animation 4628 * 4629 * @param v View to add 4630 */ 4631 private void addDisappearingView(View v) { 4632 ArrayList<View> disappearingChildren = mDisappearingChildren; 4633 4634 if (disappearingChildren == null) { 4635 disappearingChildren = mDisappearingChildren = new ArrayList<View>(); 4636 } 4637 4638 disappearingChildren.add(v); 4639 } 4640 4641 /** 4642 * Cleanup a view when its animation is done. This may mean removing it from 4643 * the list of disappearing views. 4644 * 4645 * @param view The view whose animation has finished 4646 * @param animation The animation, cannot be null 4647 */ 4648 private void finishAnimatingView(final View view, Animation animation) { 4649 final ArrayList<View> disappearingChildren = mDisappearingChildren; 4650 if (disappearingChildren != null) { 4651 if (disappearingChildren.contains(view)) { 4652 disappearingChildren.remove(view); 4653 4654 if (view.mAttachInfo != null) { 4655 view.dispatchDetachedFromWindow(); 4656 } 4657 4658 view.clearAnimation(); 4659 mGroupFlags |= FLAG_INVALIDATE_REQUIRED; 4660 } 4661 } 4662 4663 if (animation != null && !animation.getFillAfter()) { 4664 view.clearAnimation(); 4665 } 4666 4667 if ((view.mPrivateFlags & ANIMATION_STARTED) == ANIMATION_STARTED) { 4668 view.onAnimationEnd(); 4669 // Should be performed by onAnimationEnd() but this avoid an infinite loop, 4670 // so we'd rather be safe than sorry 4671 view.mPrivateFlags &= ~ANIMATION_STARTED; 4672 // Draw one more frame after the animation is done 4673 mGroupFlags |= FLAG_INVALIDATE_REQUIRED; 4674 } 4675 } 4676 4677 /** 4678 * This method tells the ViewGroup that the given View object, which should have this 4679 * ViewGroup as its parent, 4680 * should be kept around (re-displayed when the ViewGroup draws its children) even if it 4681 * is removed from its parent. This allows animations, such as those used by 4682 * {@link android.app.Fragment} and {@link android.animation.LayoutTransition} to animate 4683 * the removal of views. A call to this method should always be accompanied by a later call 4684 * to {@link #endViewTransition(View)}, such as after an animation on the View has finished, 4685 * so that the View finally gets removed. 4686 * 4687 * @param view The View object to be kept visible even if it gets removed from its parent. 4688 */ 4689 public void startViewTransition(View view) { 4690 if (view.mParent == this) { 4691 if (mTransitioningViews == null) { 4692 mTransitioningViews = new ArrayList<View>(); 4693 } 4694 mTransitioningViews.add(view); 4695 } 4696 } 4697 4698 /** 4699 * This method should always be called following an earlier call to 4700 * {@link #startViewTransition(View)}. The given View is finally removed from its parent 4701 * and will no longer be displayed. Note that this method does not perform the functionality 4702 * of removing a view from its parent; it just discontinues the display of a View that 4703 * has previously been removed. 4704 * 4705 * @return view The View object that has been removed but is being kept around in the visible 4706 * hierarchy by an earlier call to {@link #startViewTransition(View)}. 4707 */ 4708 public void endViewTransition(View view) { 4709 if (mTransitioningViews != null) { 4710 mTransitioningViews.remove(view); 4711 final ArrayList<View> disappearingChildren = mDisappearingChildren; 4712 if (disappearingChildren != null && disappearingChildren.contains(view)) { 4713 disappearingChildren.remove(view); 4714 if (mVisibilityChangingChildren != null && 4715 mVisibilityChangingChildren.contains(view)) { 4716 mVisibilityChangingChildren.remove(view); 4717 } else { 4718 if (view.mAttachInfo != null) { 4719 view.dispatchDetachedFromWindow(); 4720 } 4721 if (view.mParent != null) { 4722 view.mParent = null; 4723 } 4724 } 4725 mGroupFlags |= FLAG_INVALIDATE_REQUIRED; 4726 } 4727 } 4728 } 4729 4730 private LayoutTransition.TransitionListener mLayoutTransitionListener = 4731 new LayoutTransition.TransitionListener() { 4732 @Override 4733 public void startTransition(LayoutTransition transition, ViewGroup container, 4734 View view, int transitionType) { 4735 // We only care about disappearing items, since we need special logic to keep 4736 // those items visible after they've been 'removed' 4737 if (transitionType == LayoutTransition.DISAPPEARING) { 4738 startViewTransition(view); 4739 } 4740 } 4741 4742 @Override 4743 public void endTransition(LayoutTransition transition, ViewGroup container, 4744 View view, int transitionType) { 4745 if (mLayoutSuppressed && !transition.isChangingLayout()) { 4746 requestLayout(); 4747 mLayoutSuppressed = false; 4748 } 4749 if (transitionType == LayoutTransition.DISAPPEARING && mTransitioningViews != null) { 4750 endViewTransition(view); 4751 } 4752 } 4753 }; 4754 4755 /** 4756 * {@inheritDoc} 4757 */ 4758 @Override 4759 public boolean gatherTransparentRegion(Region region) { 4760 // If no transparent regions requested, we are always opaque. 4761 final boolean meOpaque = (mPrivateFlags & View.REQUEST_TRANSPARENT_REGIONS) == 0; 4762 if (meOpaque && region == null) { 4763 // The caller doesn't care about the region, so stop now. 4764 return true; 4765 } 4766 super.gatherTransparentRegion(region); 4767 final View[] children = mChildren; 4768 final int count = mChildrenCount; 4769 boolean noneOfTheChildrenAreTransparent = true; 4770 for (int i = 0; i < count; i++) { 4771 final View child = children[i]; 4772 if ((child.mViewFlags & VISIBILITY_MASK) == VISIBLE || child.getAnimation() != null) { 4773 if (!child.gatherTransparentRegion(region)) { 4774 noneOfTheChildrenAreTransparent = false; 4775 } 4776 } 4777 } 4778 return meOpaque || noneOfTheChildrenAreTransparent; 4779 } 4780 4781 /** 4782 * {@inheritDoc} 4783 */ 4784 public void requestTransparentRegion(View child) { 4785 if (child != null) { 4786 child.mPrivateFlags |= View.REQUEST_TRANSPARENT_REGIONS; 4787 if (mParent != null) { 4788 mParent.requestTransparentRegion(this); 4789 } 4790 } 4791 } 4792 4793 4794 @Override 4795 protected boolean fitSystemWindows(Rect insets) { 4796 boolean done = super.fitSystemWindows(insets); 4797 if (!done) { 4798 final int count = mChildrenCount; 4799 final View[] children = mChildren; 4800 for (int i = 0; i < count; i++) { 4801 done = children[i].fitSystemWindows(insets); 4802 if (done) { 4803 break; 4804 } 4805 } 4806 } 4807 return done; 4808 } 4809 4810 /** 4811 * Returns the animation listener to which layout animation events are 4812 * sent. 4813 * 4814 * @return an {@link android.view.animation.Animation.AnimationListener} 4815 */ 4816 public Animation.AnimationListener getLayoutAnimationListener() { 4817 return mAnimationListener; 4818 } 4819 4820 @Override 4821 protected void drawableStateChanged() { 4822 super.drawableStateChanged(); 4823 4824 if ((mGroupFlags & FLAG_NOTIFY_CHILDREN_ON_DRAWABLE_STATE_CHANGE) != 0) { 4825 if ((mGroupFlags & FLAG_ADD_STATES_FROM_CHILDREN) != 0) { 4826 throw new IllegalStateException("addStateFromChildren cannot be enabled if a" 4827 + " child has duplicateParentState set to true"); 4828 } 4829 4830 final View[] children = mChildren; 4831 final int count = mChildrenCount; 4832 4833 for (int i = 0; i < count; i++) { 4834 final View child = children[i]; 4835 if ((child.mViewFlags & DUPLICATE_PARENT_STATE) != 0) { 4836 child.refreshDrawableState(); 4837 } 4838 } 4839 } 4840 } 4841 4842 @Override 4843 public void jumpDrawablesToCurrentState() { 4844 super.jumpDrawablesToCurrentState(); 4845 final View[] children = mChildren; 4846 final int count = mChildrenCount; 4847 for (int i = 0; i < count; i++) { 4848 children[i].jumpDrawablesToCurrentState(); 4849 } 4850 } 4851 4852 @Override 4853 protected int[] onCreateDrawableState(int extraSpace) { 4854 if ((mGroupFlags & FLAG_ADD_STATES_FROM_CHILDREN) == 0) { 4855 return super.onCreateDrawableState(extraSpace); 4856 } 4857 4858 int need = 0; 4859 int n = getChildCount(); 4860 for (int i = 0; i < n; i++) { 4861 int[] childState = getChildAt(i).getDrawableState(); 4862 4863 if (childState != null) { 4864 need += childState.length; 4865 } 4866 } 4867 4868 int[] state = super.onCreateDrawableState(extraSpace + need); 4869 4870 for (int i = 0; i < n; i++) { 4871 int[] childState = getChildAt(i).getDrawableState(); 4872 4873 if (childState != null) { 4874 state = mergeDrawableStates(state, childState); 4875 } 4876 } 4877 4878 return state; 4879 } 4880 4881 /** 4882 * Sets whether this ViewGroup's drawable states also include 4883 * its children's drawable states. This is used, for example, to 4884 * make a group appear to be focused when its child EditText or button 4885 * is focused. 4886 */ 4887 public void setAddStatesFromChildren(boolean addsStates) { 4888 if (addsStates) { 4889 mGroupFlags |= FLAG_ADD_STATES_FROM_CHILDREN; 4890 } else { 4891 mGroupFlags &= ~FLAG_ADD_STATES_FROM_CHILDREN; 4892 } 4893 4894 refreshDrawableState(); 4895 } 4896 4897 /** 4898 * Returns whether this ViewGroup's drawable states also include 4899 * its children's drawable states. This is used, for example, to 4900 * make a group appear to be focused when its child EditText or button 4901 * is focused. 4902 */ 4903 public boolean addStatesFromChildren() { 4904 return (mGroupFlags & FLAG_ADD_STATES_FROM_CHILDREN) != 0; 4905 } 4906 4907 /** 4908 * If {link #addStatesFromChildren} is true, refreshes this group's 4909 * drawable state (to include the states from its children). 4910 */ 4911 public void childDrawableStateChanged(View child) { 4912 if ((mGroupFlags & FLAG_ADD_STATES_FROM_CHILDREN) != 0) { 4913 refreshDrawableState(); 4914 } 4915 } 4916 4917 /** 4918 * Specifies the animation listener to which layout animation events must 4919 * be sent. Only 4920 * {@link android.view.animation.Animation.AnimationListener#onAnimationStart(Animation)} 4921 * and 4922 * {@link android.view.animation.Animation.AnimationListener#onAnimationEnd(Animation)} 4923 * are invoked. 4924 * 4925 * @param animationListener the layout animation listener 4926 */ 4927 public void setLayoutAnimationListener(Animation.AnimationListener animationListener) { 4928 mAnimationListener = animationListener; 4929 } 4930 4931 /** 4932 * LayoutParams are used by views to tell their parents how they want to be 4933 * laid out. See 4934 * {@link android.R.styleable#ViewGroup_Layout ViewGroup Layout Attributes} 4935 * for a list of all child view attributes that this class supports. 4936 * 4937 * <p> 4938 * The base LayoutParams class just describes how big the view wants to be 4939 * for both width and height. For each dimension, it can specify one of: 4940 * <ul> 4941 * <li>FILL_PARENT (renamed MATCH_PARENT in API Level 8 and higher), which 4942 * means that the view wants to be as big as its parent (minus padding) 4943 * <li> WRAP_CONTENT, which means that the view wants to be just big enough 4944 * to enclose its content (plus padding) 4945 * <li> an exact number 4946 * </ul> 4947 * There are subclasses of LayoutParams for different subclasses of 4948 * ViewGroup. For example, AbsoluteLayout has its own subclass of 4949 * LayoutParams which adds an X and Y value. 4950 * 4951 * @attr ref android.R.styleable#ViewGroup_Layout_layout_height 4952 * @attr ref android.R.styleable#ViewGroup_Layout_layout_width 4953 */ 4954 public static class LayoutParams { 4955 /** 4956 * Special value for the height or width requested by a View. 4957 * FILL_PARENT means that the view wants to be as big as its parent, 4958 * minus the parent's padding, if any. This value is deprecated 4959 * starting in API Level 8 and replaced by {@link #MATCH_PARENT}. 4960 */ 4961 @SuppressWarnings({"UnusedDeclaration"}) 4962 @Deprecated 4963 public static final int FILL_PARENT = -1; 4964 4965 /** 4966 * Special value for the height or width requested by a View. 4967 * MATCH_PARENT means that the view wants to be as big as its parent, 4968 * minus the parent's padding, if any. Introduced in API Level 8. 4969 */ 4970 public static final int MATCH_PARENT = -1; 4971 4972 /** 4973 * Special value for the height or width requested by a View. 4974 * WRAP_CONTENT means that the view wants to be just large enough to fit 4975 * its own internal content, taking its own padding into account. 4976 */ 4977 public static final int WRAP_CONTENT = -2; 4978 4979 /** 4980 * Information about how wide the view wants to be. Can be one of the 4981 * constants FILL_PARENT (replaced by MATCH_PARENT , 4982 * in API Level 8) or WRAP_CONTENT. or an exact size. 4983 */ 4984 @ViewDebug.ExportedProperty(category = "layout", mapping = { 4985 @ViewDebug.IntToString(from = MATCH_PARENT, to = "MATCH_PARENT"), 4986 @ViewDebug.IntToString(from = WRAP_CONTENT, to = "WRAP_CONTENT") 4987 }) 4988 public int width; 4989 4990 /** 4991 * Information about how tall the view wants to be. Can be one of the 4992 * constants FILL_PARENT (replaced by MATCH_PARENT , 4993 * in API Level 8) or WRAP_CONTENT. or an exact size. 4994 */ 4995 @ViewDebug.ExportedProperty(category = "layout", mapping = { 4996 @ViewDebug.IntToString(from = MATCH_PARENT, to = "MATCH_PARENT"), 4997 @ViewDebug.IntToString(from = WRAP_CONTENT, to = "WRAP_CONTENT") 4998 }) 4999 public int height; 5000 5001 /** 5002 * Used to animate layouts. 5003 */ 5004 public LayoutAnimationController.AnimationParameters layoutAnimationParameters; 5005 5006 /** 5007 * Creates a new set of layout parameters. The values are extracted from 5008 * the supplied attributes set and context. The XML attributes mapped 5009 * to this set of layout parameters are: 5010 * 5011 * <ul> 5012 * <li><code>layout_width</code>: the width, either an exact value, 5013 * {@link #WRAP_CONTENT}, or {@link #FILL_PARENT} (replaced by 5014 * {@link #MATCH_PARENT} in API Level 8)</li> 5015 * <li><code>layout_height</code>: the height, either an exact value, 5016 * {@link #WRAP_CONTENT}, or {@link #FILL_PARENT} (replaced by 5017 * {@link #MATCH_PARENT} in API Level 8)</li> 5018 * </ul> 5019 * 5020 * @param c the application environment 5021 * @param attrs the set of attributes from which to extract the layout 5022 * parameters' values 5023 */ 5024 public LayoutParams(Context c, AttributeSet attrs) { 5025 TypedArray a = c.obtainStyledAttributes(attrs, R.styleable.ViewGroup_Layout); 5026 setBaseAttributes(a, 5027 R.styleable.ViewGroup_Layout_layout_width, 5028 R.styleable.ViewGroup_Layout_layout_height); 5029 a.recycle(); 5030 } 5031 5032 /** 5033 * Creates a new set of layout parameters with the specified width 5034 * and height. 5035 * 5036 * @param width the width, either {@link #WRAP_CONTENT}, 5037 * {@link #FILL_PARENT} (replaced by {@link #MATCH_PARENT} in 5038 * API Level 8), or a fixed size in pixels 5039 * @param height the height, either {@link #WRAP_CONTENT}, 5040 * {@link #FILL_PARENT} (replaced by {@link #MATCH_PARENT} in 5041 * API Level 8), or a fixed size in pixels 5042 */ 5043 public LayoutParams(int width, int height) { 5044 this.width = width; 5045 this.height = height; 5046 } 5047 5048 /** 5049 * Copy constructor. Clones the width and height values of the source. 5050 * 5051 * @param source The layout params to copy from. 5052 */ 5053 public LayoutParams(LayoutParams source) { 5054 this.width = source.width; 5055 this.height = source.height; 5056 } 5057 5058 /** 5059 * Used internally by MarginLayoutParams. 5060 * @hide 5061 */ 5062 LayoutParams() { 5063 } 5064 5065 /** 5066 * Extracts the layout parameters from the supplied attributes. 5067 * 5068 * @param a the style attributes to extract the parameters from 5069 * @param widthAttr the identifier of the width attribute 5070 * @param heightAttr the identifier of the height attribute 5071 */ 5072 protected void setBaseAttributes(TypedArray a, int widthAttr, int heightAttr) { 5073 width = a.getLayoutDimension(widthAttr, "layout_width"); 5074 height = a.getLayoutDimension(heightAttr, "layout_height"); 5075 } 5076 5077 /** 5078 * Returns a String representation of this set of layout parameters. 5079 * 5080 * @param output the String to prepend to the internal representation 5081 * @return a String with the following format: output + 5082 * "ViewGroup.LayoutParams={ width=WIDTH, height=HEIGHT }" 5083 * 5084 * @hide 5085 */ 5086 public String debug(String output) { 5087 return output + "ViewGroup.LayoutParams={ width=" 5088 + sizeToString(width) + ", height=" + sizeToString(height) + " }"; 5089 } 5090 5091 /** 5092 * Converts the specified size to a readable String. 5093 * 5094 * @param size the size to convert 5095 * @return a String instance representing the supplied size 5096 * 5097 * @hide 5098 */ 5099 protected static String sizeToString(int size) { 5100 if (size == WRAP_CONTENT) { 5101 return "wrap-content"; 5102 } 5103 if (size == MATCH_PARENT) { 5104 return "match-parent"; 5105 } 5106 return String.valueOf(size); 5107 } 5108 } 5109 5110 /** 5111 * Per-child layout information for layouts that support margins. 5112 * See 5113 * {@link android.R.styleable#ViewGroup_MarginLayout ViewGroup Margin Layout Attributes} 5114 * for a list of all child view attributes that this class supports. 5115 */ 5116 public static class MarginLayoutParams extends ViewGroup.LayoutParams { 5117 /** 5118 * The left margin in pixels of the child. 5119 */ 5120 @ViewDebug.ExportedProperty(category = "layout") 5121 public int leftMargin; 5122 5123 /** 5124 * The top margin in pixels of the child. 5125 */ 5126 @ViewDebug.ExportedProperty(category = "layout") 5127 public int topMargin; 5128 5129 /** 5130 * The right margin in pixels of the child. 5131 */ 5132 @ViewDebug.ExportedProperty(category = "layout") 5133 public int rightMargin; 5134 5135 /** 5136 * The bottom margin in pixels of the child. 5137 */ 5138 @ViewDebug.ExportedProperty(category = "layout") 5139 public int bottomMargin; 5140 5141 /** 5142 * Creates a new set of layout parameters. The values are extracted from 5143 * the supplied attributes set and context. 5144 * 5145 * @param c the application environment 5146 * @param attrs the set of attributes from which to extract the layout 5147 * parameters' values 5148 */ 5149 public MarginLayoutParams(Context c, AttributeSet attrs) { 5150 super(); 5151 5152 TypedArray a = c.obtainStyledAttributes(attrs, R.styleable.ViewGroup_MarginLayout); 5153 setBaseAttributes(a, 5154 R.styleable.ViewGroup_MarginLayout_layout_width, 5155 R.styleable.ViewGroup_MarginLayout_layout_height); 5156 5157 int margin = a.getDimensionPixelSize( 5158 com.android.internal.R.styleable.ViewGroup_MarginLayout_layout_margin, -1); 5159 if (margin >= 0) { 5160 leftMargin = margin; 5161 topMargin = margin; 5162 rightMargin= margin; 5163 bottomMargin = margin; 5164 } else { 5165 leftMargin = a.getDimensionPixelSize( 5166 R.styleable.ViewGroup_MarginLayout_layout_marginLeft, 0); 5167 topMargin = a.getDimensionPixelSize( 5168 R.styleable.ViewGroup_MarginLayout_layout_marginTop, 0); 5169 rightMargin = a.getDimensionPixelSize( 5170 R.styleable.ViewGroup_MarginLayout_layout_marginRight, 0); 5171 bottomMargin = a.getDimensionPixelSize( 5172 R.styleable.ViewGroup_MarginLayout_layout_marginBottom, 0); 5173 } 5174 5175 a.recycle(); 5176 } 5177 5178 /** 5179 * {@inheritDoc} 5180 */ 5181 public MarginLayoutParams(int width, int height) { 5182 super(width, height); 5183 } 5184 5185 /** 5186 * Copy constructor. Clones the width, height and margin values of the source. 5187 * 5188 * @param source The layout params to copy from. 5189 */ 5190 public MarginLayoutParams(MarginLayoutParams source) { 5191 this.width = source.width; 5192 this.height = source.height; 5193 5194 this.leftMargin = source.leftMargin; 5195 this.topMargin = source.topMargin; 5196 this.rightMargin = source.rightMargin; 5197 this.bottomMargin = source.bottomMargin; 5198 } 5199 5200 /** 5201 * {@inheritDoc} 5202 */ 5203 public MarginLayoutParams(LayoutParams source) { 5204 super(source); 5205 } 5206 5207 /** 5208 * Sets the margins, in pixels. 5209 * 5210 * @param left the left margin size 5211 * @param top the top margin size 5212 * @param right the right margin size 5213 * @param bottom the bottom margin size 5214 * 5215 * @attr ref android.R.styleable#ViewGroup_MarginLayout_layout_marginLeft 5216 * @attr ref android.R.styleable#ViewGroup_MarginLayout_layout_marginTop 5217 * @attr ref android.R.styleable#ViewGroup_MarginLayout_layout_marginRight 5218 * @attr ref android.R.styleable#ViewGroup_MarginLayout_layout_marginBottom 5219 */ 5220 public void setMargins(int left, int top, int right, int bottom) { 5221 leftMargin = left; 5222 topMargin = top; 5223 rightMargin = right; 5224 bottomMargin = bottom; 5225 } 5226 } 5227 5228 /* Describes a touched view and the ids of the pointers that it has captured. 5229 * 5230 * This code assumes that pointer ids are always in the range 0..31 such that 5231 * it can use a bitfield to track which pointer ids are present. 5232 * As it happens, the lower layers of the input dispatch pipeline also use the 5233 * same trick so the assumption should be safe here... 5234 */ 5235 private static final class TouchTarget { 5236 private static final int MAX_RECYCLED = 32; 5237 private static final Object sRecycleLock = new Object(); 5238 private static TouchTarget sRecycleBin; 5239 private static int sRecycledCount; 5240 5241 public static final int ALL_POINTER_IDS = -1; // all ones 5242 5243 // The touched child view. 5244 public View child; 5245 5246 // The combined bit mask of pointer ids for all pointers captured by the target. 5247 public int pointerIdBits; 5248 5249 // The next target in the target list. 5250 public TouchTarget next; 5251 5252 private TouchTarget() { 5253 } 5254 5255 public static TouchTarget obtain(View child, int pointerIdBits) { 5256 final TouchTarget target; 5257 synchronized (sRecycleLock) { 5258 if (sRecycleBin == null) { 5259 target = new TouchTarget(); 5260 } else { 5261 target = sRecycleBin; 5262 sRecycleBin = target.next; 5263 sRecycledCount--; 5264 target.next = null; 5265 } 5266 } 5267 target.child = child; 5268 target.pointerIdBits = pointerIdBits; 5269 return target; 5270 } 5271 5272 public void recycle() { 5273 synchronized (sRecycleLock) { 5274 if (sRecycledCount < MAX_RECYCLED) { 5275 next = sRecycleBin; 5276 sRecycleBin = this; 5277 sRecycledCount += 1; 5278 } else { 5279 next = null; 5280 } 5281 child = null; 5282 } 5283 } 5284 } 5285} 5286