ViewGroup.java revision 3ed259a43cd6532c9cf835c925fc89c2f4f75bc1
1/* 2 * Copyright (C) 2006 The Android Open Source Project 3 * 4 * Licensed under the Apache License, Version 2.0 (the "License"); 5 * you may not use this file except in compliance with the License. 6 * You may obtain a copy of the License at 7 * 8 * http://www.apache.org/licenses/LICENSE-2.0 9 * 10 * Unless required by applicable law or agreed to in writing, software 11 * distributed under the License is distributed on an "AS IS" BASIS, 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 13 * See the License for the specific language governing permissions and 14 * limitations under the License. 15 */ 16 17package android.view; 18 19import android.animation.LayoutTransition; 20import android.content.Context; 21import android.content.res.Configuration; 22import android.content.res.TypedArray; 23import android.graphics.Bitmap; 24import android.graphics.Canvas; 25import android.graphics.Color; 26import android.graphics.Insets; 27import android.graphics.Matrix; 28import android.graphics.Paint; 29import android.graphics.PointF; 30import android.graphics.Rect; 31import android.graphics.RectF; 32import android.graphics.Region; 33import android.os.Build; 34import android.os.Parcelable; 35import android.os.SystemClock; 36import android.util.AttributeSet; 37import android.util.Log; 38import android.util.SparseArray; 39import android.view.accessibility.AccessibilityEvent; 40import android.view.accessibility.AccessibilityNodeInfo; 41import android.view.animation.Animation; 42import android.view.animation.AnimationUtils; 43import android.view.animation.LayoutAnimationController; 44import android.view.animation.Transformation; 45 46import com.android.internal.R; 47import com.android.internal.util.Predicate; 48 49import java.util.ArrayList; 50import java.util.Collections; 51import java.util.HashSet; 52 53/** 54 * <p> 55 * A <code>ViewGroup</code> is a special view that can contain other views 56 * (called children.) The view group is the base class for layouts and views 57 * containers. This class also defines the 58 * {@link android.view.ViewGroup.LayoutParams} class which serves as the base 59 * class for layouts parameters. 60 * </p> 61 * 62 * <p> 63 * Also see {@link LayoutParams} for layout attributes. 64 * </p> 65 * 66 * <div class="special reference"> 67 * <h3>Developer Guides</h3> 68 * <p>For more information about creating user interface layouts, read the 69 * <a href="{@docRoot}guide/topics/ui/declaring-layout.html">XML Layouts</a> developer 70 * guide.</p></div> 71 * 72 * @attr ref android.R.styleable#ViewGroup_clipChildren 73 * @attr ref android.R.styleable#ViewGroup_clipToPadding 74 * @attr ref android.R.styleable#ViewGroup_layoutAnimation 75 * @attr ref android.R.styleable#ViewGroup_animationCache 76 * @attr ref android.R.styleable#ViewGroup_persistentDrawingCache 77 * @attr ref android.R.styleable#ViewGroup_alwaysDrawnWithCache 78 * @attr ref android.R.styleable#ViewGroup_addStatesFromChildren 79 * @attr ref android.R.styleable#ViewGroup_descendantFocusability 80 * @attr ref android.R.styleable#ViewGroup_animateLayoutChanges 81 */ 82public abstract class ViewGroup extends View implements ViewParent, ViewManager { 83 private static final String TAG = "ViewGroup"; 84 85 private static final boolean DBG = false; 86 87 /** 88 * Views which have been hidden or removed which need to be animated on 89 * their way out. 90 * This field should be made private, so it is hidden from the SDK. 91 * {@hide} 92 */ 93 protected ArrayList<View> mDisappearingChildren; 94 95 /** 96 * Listener used to propagate events indicating when children are added 97 * and/or removed from a view group. 98 * This field should be made private, so it is hidden from the SDK. 99 * {@hide} 100 */ 101 protected OnHierarchyChangeListener mOnHierarchyChangeListener; 102 103 // The view contained within this ViewGroup that has or contains focus. 104 private View mFocused; 105 106 /** 107 * A Transformation used when drawing children, to 108 * apply on the child being drawn. 109 */ 110 final Transformation mChildTransformation = new Transformation(); 111 112 /** 113 * Used to track the current invalidation region. 114 */ 115 RectF mInvalidateRegion; 116 117 /** 118 * A Transformation used to calculate a correct 119 * invalidation area when the application is autoscaled. 120 */ 121 Transformation mInvalidationTransformation; 122 123 // View currently under an ongoing drag 124 private View mCurrentDragView; 125 126 // Metadata about the ongoing drag 127 private DragEvent mCurrentDrag; 128 private HashSet<View> mDragNotifiedChildren; 129 130 // Does this group have a child that can accept the current drag payload? 131 private boolean mChildAcceptsDrag; 132 133 // Used during drag dispatch 134 private final PointF mLocalPoint = new PointF(); 135 136 // Layout animation 137 private LayoutAnimationController mLayoutAnimationController; 138 private Animation.AnimationListener mAnimationListener; 139 140 // First touch target in the linked list of touch targets. 141 private TouchTarget mFirstTouchTarget; 142 143 // For debugging only. You can see these in hierarchyviewer. 144 @SuppressWarnings({"FieldCanBeLocal", "UnusedDeclaration"}) 145 @ViewDebug.ExportedProperty(category = "events") 146 private long mLastTouchDownTime; 147 @ViewDebug.ExportedProperty(category = "events") 148 private int mLastTouchDownIndex = -1; 149 @SuppressWarnings({"FieldCanBeLocal", "UnusedDeclaration"}) 150 @ViewDebug.ExportedProperty(category = "events") 151 private float mLastTouchDownX; 152 @SuppressWarnings({"FieldCanBeLocal", "UnusedDeclaration"}) 153 @ViewDebug.ExportedProperty(category = "events") 154 private float mLastTouchDownY; 155 156 // First hover target in the linked list of hover targets. 157 // The hover targets are children which have received ACTION_HOVER_ENTER. 158 // They might not have actually handled the hover event, but we will 159 // continue sending hover events to them as long as the pointer remains over 160 // their bounds and the view group does not intercept hover. 161 private HoverTarget mFirstHoverTarget; 162 163 // True if the view group itself received a hover event. 164 // It might not have actually handled the hover event. 165 private boolean mHoveredSelf; 166 167 /** 168 * Internal flags. 169 * 170 * This field should be made private, so it is hidden from the SDK. 171 * {@hide} 172 */ 173 protected int mGroupFlags; 174 175 /* 176 * The layout mode: either {@link #CLIP_BOUNDS} or {@link #OPTICAL_BOUNDS} 177 */ 178 private int mLayoutMode = CLIP_BOUNDS; 179 180 /** 181 * NOTE: If you change the flags below make sure to reflect the changes 182 * the DisplayList class 183 */ 184 185 // When set, ViewGroup invalidates only the child's rectangle 186 // Set by default 187 static final int FLAG_CLIP_CHILDREN = 0x1; 188 189 // When set, ViewGroup excludes the padding area from the invalidate rectangle 190 // Set by default 191 private static final int FLAG_CLIP_TO_PADDING = 0x2; 192 193 // When set, dispatchDraw() will invoke invalidate(); this is set by drawChild() when 194 // a child needs to be invalidated and FLAG_OPTIMIZE_INVALIDATE is set 195 static final int FLAG_INVALIDATE_REQUIRED = 0x4; 196 197 // When set, dispatchDraw() will run the layout animation and unset the flag 198 private static final int FLAG_RUN_ANIMATION = 0x8; 199 200 // When set, there is either no layout animation on the ViewGroup or the layout 201 // animation is over 202 // Set by default 203 static final int FLAG_ANIMATION_DONE = 0x10; 204 205 // If set, this ViewGroup has padding; if unset there is no padding and we don't need 206 // to clip it, even if FLAG_CLIP_TO_PADDING is set 207 private static final int FLAG_PADDING_NOT_NULL = 0x20; 208 209 // When set, this ViewGroup caches its children in a Bitmap before starting a layout animation 210 // Set by default 211 private static final int FLAG_ANIMATION_CACHE = 0x40; 212 213 // When set, this ViewGroup converts calls to invalidate(Rect) to invalidate() during a 214 // layout animation; this avoid clobbering the hierarchy 215 // Automatically set when the layout animation starts, depending on the animation's 216 // characteristics 217 static final int FLAG_OPTIMIZE_INVALIDATE = 0x80; 218 219 // When set, the next call to drawChild() will clear mChildTransformation's matrix 220 static final int FLAG_CLEAR_TRANSFORMATION = 0x100; 221 222 // When set, this ViewGroup invokes mAnimationListener.onAnimationEnd() and removes 223 // the children's Bitmap caches if necessary 224 // This flag is set when the layout animation is over (after FLAG_ANIMATION_DONE is set) 225 private static final int FLAG_NOTIFY_ANIMATION_LISTENER = 0x200; 226 227 /** 228 * When set, the drawing method will call {@link #getChildDrawingOrder(int, int)} 229 * to get the index of the child to draw for that iteration. 230 * 231 * @hide 232 */ 233 protected static final int FLAG_USE_CHILD_DRAWING_ORDER = 0x400; 234 235 /** 236 * When set, this ViewGroup supports static transformations on children; this causes 237 * {@link #getChildStaticTransformation(View, android.view.animation.Transformation)} to be 238 * invoked when a child is drawn. 239 * 240 * Any subclass overriding 241 * {@link #getChildStaticTransformation(View, android.view.animation.Transformation)} should 242 * set this flags in {@link #mGroupFlags}. 243 * 244 * {@hide} 245 */ 246 protected static final int FLAG_SUPPORT_STATIC_TRANSFORMATIONS = 0x800; 247 248 // When the previous drawChild() invocation used an alpha value that was lower than 249 // 1.0 and set it in mCachePaint 250 static final int FLAG_ALPHA_LOWER_THAN_ONE = 0x1000; 251 252 /** 253 * When set, this ViewGroup's drawable states also include those 254 * of its children. 255 */ 256 private static final int FLAG_ADD_STATES_FROM_CHILDREN = 0x2000; 257 258 /** 259 * When set, this ViewGroup tries to always draw its children using their drawing cache. 260 */ 261 static final int FLAG_ALWAYS_DRAWN_WITH_CACHE = 0x4000; 262 263 /** 264 * When set, and if FLAG_ALWAYS_DRAWN_WITH_CACHE is not set, this ViewGroup will try to 265 * draw its children with their drawing cache. 266 */ 267 static final int FLAG_CHILDREN_DRAWN_WITH_CACHE = 0x8000; 268 269 /** 270 * When set, this group will go through its list of children to notify them of 271 * any drawable state change. 272 */ 273 private static final int FLAG_NOTIFY_CHILDREN_ON_DRAWABLE_STATE_CHANGE = 0x10000; 274 275 private static final int FLAG_MASK_FOCUSABILITY = 0x60000; 276 277 /** 278 * This view will get focus before any of its descendants. 279 */ 280 public static final int FOCUS_BEFORE_DESCENDANTS = 0x20000; 281 282 /** 283 * This view will get focus only if none of its descendants want it. 284 */ 285 public static final int FOCUS_AFTER_DESCENDANTS = 0x40000; 286 287 /** 288 * This view will block any of its descendants from getting focus, even 289 * if they are focusable. 290 */ 291 public static final int FOCUS_BLOCK_DESCENDANTS = 0x60000; 292 293 /** 294 * Used to map between enum in attrubutes and flag values. 295 */ 296 private static final int[] DESCENDANT_FOCUSABILITY_FLAGS = 297 {FOCUS_BEFORE_DESCENDANTS, FOCUS_AFTER_DESCENDANTS, 298 FOCUS_BLOCK_DESCENDANTS}; 299 300 /** 301 * When set, this ViewGroup should not intercept touch events. 302 * {@hide} 303 */ 304 protected static final int FLAG_DISALLOW_INTERCEPT = 0x80000; 305 306 /** 307 * When set, this ViewGroup will split MotionEvents to multiple child Views when appropriate. 308 */ 309 private static final int FLAG_SPLIT_MOTION_EVENTS = 0x200000; 310 311 /** 312 * When set, this ViewGroup will not dispatch onAttachedToWindow calls 313 * to children when adding new views. This is used to prevent multiple 314 * onAttached calls when a ViewGroup adds children in its own onAttached method. 315 */ 316 private static final int FLAG_PREVENT_DISPATCH_ATTACHED_TO_WINDOW = 0x400000; 317 318 /** 319 * Indicates which types of drawing caches are to be kept in memory. 320 * This field should be made private, so it is hidden from the SDK. 321 * {@hide} 322 */ 323 protected int mPersistentDrawingCache; 324 325 /** 326 * Used to indicate that no drawing cache should be kept in memory. 327 */ 328 public static final int PERSISTENT_NO_CACHE = 0x0; 329 330 /** 331 * Used to indicate that the animation drawing cache should be kept in memory. 332 */ 333 public static final int PERSISTENT_ANIMATION_CACHE = 0x1; 334 335 /** 336 * Used to indicate that the scrolling drawing cache should be kept in memory. 337 */ 338 public static final int PERSISTENT_SCROLLING_CACHE = 0x2; 339 340 /** 341 * Used to indicate that all drawing caches should be kept in memory. 342 */ 343 public static final int PERSISTENT_ALL_CACHES = 0x3; 344 345 // Layout Modes 346 347 /** 348 * This constant is a {@link #setLayoutMode(int) layoutMode}. 349 * Clip bounds are the raw values of {@link #getLeft() left}, {@link #getTop() top}, 350 * {@link #getRight() right} and {@link #getBottom() bottom}. 351 * 352 * @hide 353 */ 354 public static final int CLIP_BOUNDS = 0; 355 356 /** 357 * This constant is a {@link #setLayoutMode(int) layoutMode}. 358 * Optical bounds describe where a widget appears to be. They sit inside the clip 359 * bounds which need to cover a larger area to allow other effects, 360 * such as shadows and glows, to be drawn. 361 * 362 * @hide 363 */ 364 public static final int OPTICAL_BOUNDS = 1; 365 366 /** 367 * We clip to padding when FLAG_CLIP_TO_PADDING and FLAG_PADDING_NOT_NULL 368 * are set at the same time. 369 */ 370 protected static final int CLIP_TO_PADDING_MASK = FLAG_CLIP_TO_PADDING | FLAG_PADDING_NOT_NULL; 371 372 // Index of the child's left position in the mLocation array 373 private static final int CHILD_LEFT_INDEX = 0; 374 // Index of the child's top position in the mLocation array 375 private static final int CHILD_TOP_INDEX = 1; 376 377 // Child views of this ViewGroup 378 private View[] mChildren; 379 // Number of valid children in the mChildren array, the rest should be null or not 380 // considered as children 381 382 private boolean mLayoutSuppressed = false; 383 384 private int mChildrenCount; 385 386 private static final int ARRAY_INITIAL_CAPACITY = 12; 387 private static final int ARRAY_CAPACITY_INCREMENT = 12; 388 389 private static Paint sDebugPaint; 390 private static float[] sDebugLines; 391 392 // Used to draw cached views 393 Paint mCachePaint; 394 395 // Used to animate add/remove changes in layout 396 private LayoutTransition mTransition; 397 398 // The set of views that are currently being transitioned. This list is used to track views 399 // being removed that should not actually be removed from the parent yet because they are 400 // being animated. 401 private ArrayList<View> mTransitioningViews; 402 403 // List of children changing visibility. This is used to potentially keep rendering 404 // views during a transition when they otherwise would have become gone/invisible 405 private ArrayList<View> mVisibilityChangingChildren; 406 407 // Indicates whether this container will use its children layers to draw 408 @ViewDebug.ExportedProperty(category = "drawing") 409 boolean mDrawLayers = true; 410 411 // Indicates how many of this container's child subtrees contain transient state 412 @ViewDebug.ExportedProperty(category = "layout") 413 private int mChildCountWithTransientState = 0; 414 415 public ViewGroup(Context context) { 416 super(context); 417 initViewGroup(); 418 } 419 420 public ViewGroup(Context context, AttributeSet attrs) { 421 super(context, attrs); 422 initViewGroup(); 423 initFromAttributes(context, attrs); 424 } 425 426 public ViewGroup(Context context, AttributeSet attrs, int defStyle) { 427 super(context, attrs, defStyle); 428 initViewGroup(); 429 initFromAttributes(context, attrs); 430 } 431 432 private boolean debugDraw() { 433 return mAttachInfo != null && mAttachInfo.mDebugLayout; 434 } 435 436 private void initViewGroup() { 437 // ViewGroup doesn't draw by default 438 if (!debugDraw()) { 439 setFlags(WILL_NOT_DRAW, DRAW_MASK); 440 } 441 mGroupFlags |= FLAG_CLIP_CHILDREN; 442 mGroupFlags |= FLAG_CLIP_TO_PADDING; 443 mGroupFlags |= FLAG_ANIMATION_DONE; 444 mGroupFlags |= FLAG_ANIMATION_CACHE; 445 mGroupFlags |= FLAG_ALWAYS_DRAWN_WITH_CACHE; 446 447 if (mContext.getApplicationInfo().targetSdkVersion >= Build.VERSION_CODES.HONEYCOMB) { 448 mGroupFlags |= FLAG_SPLIT_MOTION_EVENTS; 449 } 450 451 setDescendantFocusability(FOCUS_BEFORE_DESCENDANTS); 452 453 mChildren = new View[ARRAY_INITIAL_CAPACITY]; 454 mChildrenCount = 0; 455 456 mPersistentDrawingCache = PERSISTENT_SCROLLING_CACHE; 457 } 458 459 private void initFromAttributes(Context context, AttributeSet attrs) { 460 TypedArray a = context.obtainStyledAttributes(attrs, 461 R.styleable.ViewGroup); 462 463 final int N = a.getIndexCount(); 464 for (int i = 0; i < N; i++) { 465 int attr = a.getIndex(i); 466 switch (attr) { 467 case R.styleable.ViewGroup_clipChildren: 468 setClipChildren(a.getBoolean(attr, true)); 469 break; 470 case R.styleable.ViewGroup_clipToPadding: 471 setClipToPadding(a.getBoolean(attr, true)); 472 break; 473 case R.styleable.ViewGroup_animationCache: 474 setAnimationCacheEnabled(a.getBoolean(attr, true)); 475 break; 476 case R.styleable.ViewGroup_persistentDrawingCache: 477 setPersistentDrawingCache(a.getInt(attr, PERSISTENT_SCROLLING_CACHE)); 478 break; 479 case R.styleable.ViewGroup_addStatesFromChildren: 480 setAddStatesFromChildren(a.getBoolean(attr, false)); 481 break; 482 case R.styleable.ViewGroup_alwaysDrawnWithCache: 483 setAlwaysDrawnWithCacheEnabled(a.getBoolean(attr, true)); 484 break; 485 case R.styleable.ViewGroup_layoutAnimation: 486 int id = a.getResourceId(attr, -1); 487 if (id > 0) { 488 setLayoutAnimation(AnimationUtils.loadLayoutAnimation(mContext, id)); 489 } 490 break; 491 case R.styleable.ViewGroup_descendantFocusability: 492 setDescendantFocusability(DESCENDANT_FOCUSABILITY_FLAGS[a.getInt(attr, 0)]); 493 break; 494 case R.styleable.ViewGroup_splitMotionEvents: 495 setMotionEventSplittingEnabled(a.getBoolean(attr, false)); 496 break; 497 case R.styleable.ViewGroup_animateLayoutChanges: 498 boolean animateLayoutChanges = a.getBoolean(attr, false); 499 if (animateLayoutChanges) { 500 setLayoutTransition(new LayoutTransition()); 501 } 502 break; 503 } 504 } 505 506 a.recycle(); 507 } 508 509 /** 510 * Gets the descendant focusability of this view group. The descendant 511 * focusability defines the relationship between this view group and its 512 * descendants when looking for a view to take focus in 513 * {@link #requestFocus(int, android.graphics.Rect)}. 514 * 515 * @return one of {@link #FOCUS_BEFORE_DESCENDANTS}, {@link #FOCUS_AFTER_DESCENDANTS}, 516 * {@link #FOCUS_BLOCK_DESCENDANTS}. 517 */ 518 @ViewDebug.ExportedProperty(category = "focus", mapping = { 519 @ViewDebug.IntToString(from = FOCUS_BEFORE_DESCENDANTS, to = "FOCUS_BEFORE_DESCENDANTS"), 520 @ViewDebug.IntToString(from = FOCUS_AFTER_DESCENDANTS, to = "FOCUS_AFTER_DESCENDANTS"), 521 @ViewDebug.IntToString(from = FOCUS_BLOCK_DESCENDANTS, to = "FOCUS_BLOCK_DESCENDANTS") 522 }) 523 public int getDescendantFocusability() { 524 return mGroupFlags & FLAG_MASK_FOCUSABILITY; 525 } 526 527 /** 528 * Set the descendant focusability of this view group. This defines the relationship 529 * between this view group and its descendants when looking for a view to 530 * take focus in {@link #requestFocus(int, android.graphics.Rect)}. 531 * 532 * @param focusability one of {@link #FOCUS_BEFORE_DESCENDANTS}, {@link #FOCUS_AFTER_DESCENDANTS}, 533 * {@link #FOCUS_BLOCK_DESCENDANTS}. 534 */ 535 public void setDescendantFocusability(int focusability) { 536 switch (focusability) { 537 case FOCUS_BEFORE_DESCENDANTS: 538 case FOCUS_AFTER_DESCENDANTS: 539 case FOCUS_BLOCK_DESCENDANTS: 540 break; 541 default: 542 throw new IllegalArgumentException("must be one of FOCUS_BEFORE_DESCENDANTS, " 543 + "FOCUS_AFTER_DESCENDANTS, FOCUS_BLOCK_DESCENDANTS"); 544 } 545 mGroupFlags &= ~FLAG_MASK_FOCUSABILITY; 546 mGroupFlags |= (focusability & FLAG_MASK_FOCUSABILITY); 547 } 548 549 /** 550 * {@inheritDoc} 551 */ 552 @Override 553 void handleFocusGainInternal(int direction, Rect previouslyFocusedRect) { 554 if (mFocused != null) { 555 mFocused.unFocus(); 556 mFocused = null; 557 } 558 super.handleFocusGainInternal(direction, previouslyFocusedRect); 559 } 560 561 /** 562 * {@inheritDoc} 563 */ 564 public void requestChildFocus(View child, View focused) { 565 if (DBG) { 566 System.out.println(this + " requestChildFocus()"); 567 } 568 if (getDescendantFocusability() == FOCUS_BLOCK_DESCENDANTS) { 569 return; 570 } 571 572 // Unfocus us, if necessary 573 super.unFocus(); 574 575 // We had a previous notion of who had focus. Clear it. 576 if (mFocused != child) { 577 if (mFocused != null) { 578 mFocused.unFocus(); 579 } 580 581 mFocused = child; 582 } 583 if (mParent != null) { 584 mParent.requestChildFocus(this, focused); 585 } 586 } 587 588 /** 589 * {@inheritDoc} 590 */ 591 public void focusableViewAvailable(View v) { 592 if (mParent != null 593 // shortcut: don't report a new focusable view if we block our descendants from 594 // getting focus 595 && (getDescendantFocusability() != FOCUS_BLOCK_DESCENDANTS) 596 // shortcut: don't report a new focusable view if we already are focused 597 // (and we don't prefer our descendants) 598 // 599 // note: knowing that mFocused is non-null is not a good enough reason 600 // to break the traversal since in that case we'd actually have to find 601 // the focused view and make sure it wasn't FOCUS_AFTER_DESCENDANTS and 602 // an ancestor of v; this will get checked for at ViewAncestor 603 && !(isFocused() && getDescendantFocusability() != FOCUS_AFTER_DESCENDANTS)) { 604 mParent.focusableViewAvailable(v); 605 } 606 } 607 608 /** 609 * {@inheritDoc} 610 */ 611 public boolean showContextMenuForChild(View originalView) { 612 return mParent != null && mParent.showContextMenuForChild(originalView); 613 } 614 615 /** 616 * {@inheritDoc} 617 */ 618 public ActionMode startActionModeForChild(View originalView, ActionMode.Callback callback) { 619 return mParent != null ? mParent.startActionModeForChild(originalView, callback) : null; 620 } 621 622 /** 623 * Find the nearest view in the specified direction that wants to take 624 * focus. 625 * 626 * @param focused The view that currently has focus 627 * @param direction One of FOCUS_UP, FOCUS_DOWN, FOCUS_LEFT, and 628 * FOCUS_RIGHT, or 0 for not applicable. 629 */ 630 public View focusSearch(View focused, int direction) { 631 if (isRootNamespace()) { 632 // root namespace means we should consider ourselves the top of the 633 // tree for focus searching; otherwise we could be focus searching 634 // into other tabs. see LocalActivityManager and TabHost for more info 635 return FocusFinder.getInstance().findNextFocus(this, focused, direction); 636 } else if (mParent != null) { 637 return mParent.focusSearch(focused, direction); 638 } 639 return null; 640 } 641 642 /** 643 * {@inheritDoc} 644 */ 645 public boolean requestChildRectangleOnScreen(View child, Rect rectangle, boolean immediate) { 646 return false; 647 } 648 649 /** 650 * {@inheritDoc} 651 */ 652 @Override 653 public boolean requestSendAccessibilityEvent(View child, AccessibilityEvent event) { 654 ViewParent parent = mParent; 655 if (parent == null) { 656 return false; 657 } 658 final boolean propagate = onRequestSendAccessibilityEvent(child, event); 659 if (!propagate) { 660 return false; 661 } 662 return parent.requestSendAccessibilityEvent(this, event); 663 } 664 665 /** 666 * Called when a child has requested sending an {@link AccessibilityEvent} and 667 * gives an opportunity to its parent to augment the event. 668 * <p> 669 * If an {@link android.view.View.AccessibilityDelegate} has been specified via calling 670 * {@link android.view.View#setAccessibilityDelegate(android.view.View.AccessibilityDelegate)} its 671 * {@link android.view.View.AccessibilityDelegate#onRequestSendAccessibilityEvent(ViewGroup, View, AccessibilityEvent)} 672 * is responsible for handling this call. 673 * </p> 674 * 675 * @param child The child which requests sending the event. 676 * @param event The event to be sent. 677 * @return True if the event should be sent. 678 * 679 * @see #requestSendAccessibilityEvent(View, AccessibilityEvent) 680 */ 681 public boolean onRequestSendAccessibilityEvent(View child, AccessibilityEvent event) { 682 if (mAccessibilityDelegate != null) { 683 return mAccessibilityDelegate.onRequestSendAccessibilityEvent(this, child, event); 684 } else { 685 return onRequestSendAccessibilityEventInternal(child, event); 686 } 687 } 688 689 /** 690 * @see #onRequestSendAccessibilityEvent(View, AccessibilityEvent) 691 * 692 * Note: Called from the default {@link View.AccessibilityDelegate}. 693 */ 694 boolean onRequestSendAccessibilityEventInternal(View child, AccessibilityEvent event) { 695 return true; 696 } 697 698 /** 699 * Called when a child view has changed whether or not it is tracking transient state. 700 * 701 * @hide 702 */ 703 public void childHasTransientStateChanged(View child, boolean childHasTransientState) { 704 final boolean oldHasTransientState = hasTransientState(); 705 if (childHasTransientState) { 706 mChildCountWithTransientState++; 707 } else { 708 mChildCountWithTransientState--; 709 } 710 711 final boolean newHasTransientState = hasTransientState(); 712 if (mParent != null && oldHasTransientState != newHasTransientState) { 713 try { 714 mParent.childHasTransientStateChanged(this, newHasTransientState); 715 } catch (AbstractMethodError e) { 716 Log.e(TAG, mParent.getClass().getSimpleName() + 717 " does not fully implement ViewParent", e); 718 } 719 } 720 } 721 722 /** 723 * @hide 724 */ 725 @Override 726 public boolean hasTransientState() { 727 return mChildCountWithTransientState > 0 || super.hasTransientState(); 728 } 729 730 /** 731 * {@inheritDoc} 732 */ 733 @Override 734 public boolean dispatchUnhandledMove(View focused, int direction) { 735 return mFocused != null && 736 mFocused.dispatchUnhandledMove(focused, direction); 737 } 738 739 /** 740 * {@inheritDoc} 741 */ 742 public void clearChildFocus(View child) { 743 if (DBG) { 744 System.out.println(this + " clearChildFocus()"); 745 } 746 747 mFocused = null; 748 if (mParent != null) { 749 mParent.clearChildFocus(this); 750 } 751 } 752 753 /** 754 * {@inheritDoc} 755 */ 756 @Override 757 public void clearFocus() { 758 if (DBG) { 759 System.out.println(this + " clearFocus()"); 760 } 761 if (mFocused == null) { 762 super.clearFocus(); 763 } else { 764 mFocused.clearFocus(); 765 mFocused = null; 766 } 767 } 768 769 /** 770 * {@inheritDoc} 771 */ 772 @Override 773 void unFocus() { 774 if (DBG) { 775 System.out.println(this + " unFocus()"); 776 } 777 if (mFocused == null) { 778 super.unFocus(); 779 } else { 780 mFocused.unFocus(); 781 mFocused = null; 782 } 783 } 784 785 /** 786 * Returns the focused child of this view, if any. The child may have focus 787 * or contain focus. 788 * 789 * @return the focused child or null. 790 */ 791 public View getFocusedChild() { 792 return mFocused; 793 } 794 795 /** 796 * Returns true if this view has or contains focus 797 * 798 * @return true if this view has or contains focus 799 */ 800 @Override 801 public boolean hasFocus() { 802 return (mPrivateFlags & FOCUSED) != 0 || mFocused != null; 803 } 804 805 /* 806 * (non-Javadoc) 807 * 808 * @see android.view.View#findFocus() 809 */ 810 @Override 811 public View findFocus() { 812 if (DBG) { 813 System.out.println("Find focus in " + this + ": flags=" 814 + isFocused() + ", child=" + mFocused); 815 } 816 817 if (isFocused()) { 818 return this; 819 } 820 821 if (mFocused != null) { 822 return mFocused.findFocus(); 823 } 824 return null; 825 } 826 827 /** 828 * {@inheritDoc} 829 */ 830 @Override 831 public boolean hasFocusable() { 832 if ((mViewFlags & VISIBILITY_MASK) != VISIBLE) { 833 return false; 834 } 835 836 if (isFocusable()) { 837 return true; 838 } 839 840 final int descendantFocusability = getDescendantFocusability(); 841 if (descendantFocusability != FOCUS_BLOCK_DESCENDANTS) { 842 final int count = mChildrenCount; 843 final View[] children = mChildren; 844 845 for (int i = 0; i < count; i++) { 846 final View child = children[i]; 847 if (child.hasFocusable()) { 848 return true; 849 } 850 } 851 } 852 853 return false; 854 } 855 856 /** 857 * {@inheritDoc} 858 */ 859 @Override 860 public void addFocusables(ArrayList<View> views, int direction) { 861 addFocusables(views, direction, FOCUSABLES_TOUCH_MODE); 862 } 863 864 /** 865 * {@inheritDoc} 866 */ 867 @Override 868 public void addFocusables(ArrayList<View> views, int direction, int focusableMode) { 869 final int focusableCount = views.size(); 870 871 final int descendantFocusability = getDescendantFocusability(); 872 873 if (descendantFocusability != FOCUS_BLOCK_DESCENDANTS) { 874 final int count = mChildrenCount; 875 final View[] children = mChildren; 876 877 for (int i = 0; i < count; i++) { 878 final View child = children[i]; 879 if ((child.mViewFlags & VISIBILITY_MASK) == VISIBLE) { 880 child.addFocusables(views, direction, focusableMode); 881 } 882 } 883 } 884 885 // we add ourselves (if focusable) in all cases except for when we are 886 // FOCUS_AFTER_DESCENDANTS and there are some descendants focusable. this is 887 // to avoid the focus search finding layouts when a more precise search 888 // among the focusable children would be more interesting. 889 if ( 890 descendantFocusability != FOCUS_AFTER_DESCENDANTS || 891 // No focusable descendants 892 (focusableCount == views.size())) { 893 super.addFocusables(views, direction, focusableMode); 894 } 895 } 896 897 @Override 898 public void findViewsWithText(ArrayList<View> outViews, CharSequence text, int flags) { 899 super.findViewsWithText(outViews, text, flags); 900 final int childrenCount = mChildrenCount; 901 final View[] children = mChildren; 902 for (int i = 0; i < childrenCount; i++) { 903 View child = children[i]; 904 if ((child.mViewFlags & VISIBILITY_MASK) == VISIBLE 905 && (child.mPrivateFlags & IS_ROOT_NAMESPACE) == 0) { 906 child.findViewsWithText(outViews, text, flags); 907 } 908 } 909 } 910 911 @Override 912 View findViewByAccessibilityIdTraversal(int accessibilityId) { 913 View foundView = super.findViewByAccessibilityIdTraversal(accessibilityId); 914 if (foundView != null) { 915 return foundView; 916 } 917 final int childrenCount = mChildrenCount; 918 final View[] children = mChildren; 919 for (int i = 0; i < childrenCount; i++) { 920 View child = children[i]; 921 foundView = child.findViewByAccessibilityIdTraversal(accessibilityId); 922 if (foundView != null) { 923 return foundView; 924 } 925 } 926 return null; 927 } 928 929 /** 930 * {@inheritDoc} 931 */ 932 @Override 933 public void dispatchWindowFocusChanged(boolean hasFocus) { 934 super.dispatchWindowFocusChanged(hasFocus); 935 final int count = mChildrenCount; 936 final View[] children = mChildren; 937 for (int i = 0; i < count; i++) { 938 children[i].dispatchWindowFocusChanged(hasFocus); 939 } 940 } 941 942 /** 943 * {@inheritDoc} 944 */ 945 @Override 946 public void addTouchables(ArrayList<View> views) { 947 super.addTouchables(views); 948 949 final int count = mChildrenCount; 950 final View[] children = mChildren; 951 952 for (int i = 0; i < count; i++) { 953 final View child = children[i]; 954 if ((child.mViewFlags & VISIBILITY_MASK) == VISIBLE) { 955 child.addTouchables(views); 956 } 957 } 958 } 959 960 /** 961 * @hide 962 */ 963 @Override 964 public void makeOptionalFitsSystemWindows() { 965 super.makeOptionalFitsSystemWindows(); 966 final int count = mChildrenCount; 967 final View[] children = mChildren; 968 for (int i = 0; i < count; i++) { 969 children[i].makeOptionalFitsSystemWindows(); 970 } 971 } 972 973 /** 974 * {@inheritDoc} 975 */ 976 @Override 977 public void dispatchDisplayHint(int hint) { 978 super.dispatchDisplayHint(hint); 979 final int count = mChildrenCount; 980 final View[] children = mChildren; 981 for (int i = 0; i < count; i++) { 982 children[i].dispatchDisplayHint(hint); 983 } 984 } 985 986 /** 987 * Called when a view's visibility has changed. Notify the parent to take any appropriate 988 * action. 989 * 990 * @param child The view whose visibility has changed 991 * @param oldVisibility The previous visibility value (GONE, INVISIBLE, or VISIBLE). 992 * @param newVisibility The new visibility value (GONE, INVISIBLE, or VISIBLE). 993 * @hide 994 */ 995 protected void onChildVisibilityChanged(View child, int oldVisibility, int newVisibility) { 996 if (mTransition != null) { 997 if (newVisibility == VISIBLE) { 998 mTransition.showChild(this, child, oldVisibility); 999 } else { 1000 mTransition.hideChild(this, child, newVisibility); 1001 // Only track this on disappearing views - appearing views are already visible 1002 // and don't need special handling during drawChild() 1003 if (mVisibilityChangingChildren == null) { 1004 mVisibilityChangingChildren = new ArrayList<View>(); 1005 } 1006 mVisibilityChangingChildren.add(child); 1007 if (mTransitioningViews != null && mTransitioningViews.contains(child)) { 1008 addDisappearingView(child); 1009 } 1010 } 1011 } 1012 1013 // in all cases, for drags 1014 if (mCurrentDrag != null) { 1015 if (newVisibility == VISIBLE) { 1016 notifyChildOfDrag(child); 1017 } 1018 } 1019 } 1020 1021 /** 1022 * {@inheritDoc} 1023 */ 1024 @Override 1025 protected void dispatchVisibilityChanged(View changedView, int visibility) { 1026 super.dispatchVisibilityChanged(changedView, visibility); 1027 final int count = mChildrenCount; 1028 final View[] children = mChildren; 1029 for (int i = 0; i < count; i++) { 1030 children[i].dispatchVisibilityChanged(changedView, visibility); 1031 } 1032 } 1033 1034 /** 1035 * {@inheritDoc} 1036 */ 1037 @Override 1038 public void dispatchWindowVisibilityChanged(int visibility) { 1039 super.dispatchWindowVisibilityChanged(visibility); 1040 final int count = mChildrenCount; 1041 final View[] children = mChildren; 1042 for (int i = 0; i < count; i++) { 1043 children[i].dispatchWindowVisibilityChanged(visibility); 1044 } 1045 } 1046 1047 /** 1048 * {@inheritDoc} 1049 */ 1050 @Override 1051 public void dispatchConfigurationChanged(Configuration newConfig) { 1052 super.dispatchConfigurationChanged(newConfig); 1053 final int count = mChildrenCount; 1054 final View[] children = mChildren; 1055 for (int i = 0; i < count; i++) { 1056 children[i].dispatchConfigurationChanged(newConfig); 1057 } 1058 } 1059 1060 /** 1061 * {@inheritDoc} 1062 */ 1063 public void recomputeViewAttributes(View child) { 1064 if (mAttachInfo != null && !mAttachInfo.mRecomputeGlobalAttributes) { 1065 ViewParent parent = mParent; 1066 if (parent != null) parent.recomputeViewAttributes(this); 1067 } 1068 } 1069 1070 @Override 1071 void dispatchCollectViewAttributes(AttachInfo attachInfo, int visibility) { 1072 if ((visibility & VISIBILITY_MASK) == VISIBLE) { 1073 super.dispatchCollectViewAttributes(attachInfo, visibility); 1074 final int count = mChildrenCount; 1075 final View[] children = mChildren; 1076 for (int i = 0; i < count; i++) { 1077 final View child = children[i]; 1078 child.dispatchCollectViewAttributes(attachInfo, 1079 visibility | (child.mViewFlags&VISIBILITY_MASK)); 1080 } 1081 } 1082 } 1083 1084 /** 1085 * {@inheritDoc} 1086 */ 1087 public void bringChildToFront(View child) { 1088 int index = indexOfChild(child); 1089 if (index >= 0) { 1090 removeFromArray(index); 1091 addInArray(child, mChildrenCount); 1092 child.mParent = this; 1093 } 1094 } 1095 1096 /** 1097 * {@inheritDoc} 1098 */ 1099 // TODO: Write real docs 1100 @Override 1101 public boolean dispatchDragEvent(DragEvent event) { 1102 boolean retval = false; 1103 final float tx = event.mX; 1104 final float ty = event.mY; 1105 1106 ViewRootImpl root = getViewRootImpl(); 1107 1108 // Dispatch down the view hierarchy 1109 switch (event.mAction) { 1110 case DragEvent.ACTION_DRAG_STARTED: { 1111 // clear state to recalculate which views we drag over 1112 mCurrentDragView = null; 1113 1114 // Set up our tracking of drag-started notifications 1115 mCurrentDrag = DragEvent.obtain(event); 1116 if (mDragNotifiedChildren == null) { 1117 mDragNotifiedChildren = new HashSet<View>(); 1118 } else { 1119 mDragNotifiedChildren.clear(); 1120 } 1121 1122 // Now dispatch down to our children, caching the responses 1123 mChildAcceptsDrag = false; 1124 final int count = mChildrenCount; 1125 final View[] children = mChildren; 1126 for (int i = 0; i < count; i++) { 1127 final View child = children[i]; 1128 child.mPrivateFlags2 &= ~View.DRAG_MASK; 1129 if (child.getVisibility() == VISIBLE) { 1130 final boolean handled = notifyChildOfDrag(children[i]); 1131 if (handled) { 1132 mChildAcceptsDrag = true; 1133 } 1134 } 1135 } 1136 1137 // Return HANDLED if one of our children can accept the drag 1138 if (mChildAcceptsDrag) { 1139 retval = true; 1140 } 1141 } break; 1142 1143 case DragEvent.ACTION_DRAG_ENDED: { 1144 // Release the bookkeeping now that the drag lifecycle has ended 1145 if (mDragNotifiedChildren != null) { 1146 for (View child : mDragNotifiedChildren) { 1147 // If a child was notified about an ongoing drag, it's told that it's over 1148 child.dispatchDragEvent(event); 1149 child.mPrivateFlags2 &= ~View.DRAG_MASK; 1150 child.refreshDrawableState(); 1151 } 1152 1153 mDragNotifiedChildren.clear(); 1154 mCurrentDrag.recycle(); 1155 mCurrentDrag = null; 1156 } 1157 1158 // We consider drag-ended to have been handled if one of our children 1159 // had offered to handle the drag. 1160 if (mChildAcceptsDrag) { 1161 retval = true; 1162 } 1163 } break; 1164 1165 case DragEvent.ACTION_DRAG_LOCATION: { 1166 // Find the [possibly new] drag target 1167 final View target = findFrontmostDroppableChildAt(event.mX, event.mY, mLocalPoint); 1168 1169 // If we've changed apparent drag target, tell the view root which view 1170 // we're over now [for purposes of the eventual drag-recipient-changed 1171 // notifications to the framework] and tell the new target that the drag 1172 // has entered its bounds. The root will see setDragFocus() calls all 1173 // the way down to the final leaf view that is handling the LOCATION event 1174 // before reporting the new potential recipient to the framework. 1175 if (mCurrentDragView != target) { 1176 root.setDragFocus(target); 1177 1178 final int action = event.mAction; 1179 // If we've dragged off of a child view, send it the EXITED message 1180 if (mCurrentDragView != null) { 1181 final View view = mCurrentDragView; 1182 event.mAction = DragEvent.ACTION_DRAG_EXITED; 1183 view.dispatchDragEvent(event); 1184 view.mPrivateFlags2 &= ~View.DRAG_HOVERED; 1185 view.refreshDrawableState(); 1186 } 1187 mCurrentDragView = target; 1188 1189 // If we've dragged over a new child view, send it the ENTERED message 1190 if (target != null) { 1191 event.mAction = DragEvent.ACTION_DRAG_ENTERED; 1192 target.dispatchDragEvent(event); 1193 target.mPrivateFlags2 |= View.DRAG_HOVERED; 1194 target.refreshDrawableState(); 1195 } 1196 event.mAction = action; // restore the event's original state 1197 } 1198 1199 // Dispatch the actual drag location notice, localized into its coordinates 1200 if (target != null) { 1201 event.mX = mLocalPoint.x; 1202 event.mY = mLocalPoint.y; 1203 1204 retval = target.dispatchDragEvent(event); 1205 1206 event.mX = tx; 1207 event.mY = ty; 1208 } 1209 } break; 1210 1211 /* Entered / exited dispatch 1212 * 1213 * DRAG_ENTERED is not dispatched downwards from ViewGroup. The reason for this is 1214 * that we're about to get the corresponding LOCATION event, which we will use to 1215 * determine which of our children is the new target; at that point we will 1216 * push a DRAG_ENTERED down to the new target child [which may itself be a ViewGroup]. 1217 * 1218 * DRAG_EXITED *is* dispatched all the way down immediately: once we know the 1219 * drag has left this ViewGroup, we know by definition that every contained subview 1220 * is also no longer under the drag point. 1221 */ 1222 1223 case DragEvent.ACTION_DRAG_EXITED: { 1224 if (mCurrentDragView != null) { 1225 final View view = mCurrentDragView; 1226 view.dispatchDragEvent(event); 1227 view.mPrivateFlags2 &= ~View.DRAG_HOVERED; 1228 view.refreshDrawableState(); 1229 1230 mCurrentDragView = null; 1231 } 1232 } break; 1233 1234 case DragEvent.ACTION_DROP: { 1235 if (ViewDebug.DEBUG_DRAG) Log.d(View.VIEW_LOG_TAG, "Drop event: " + event); 1236 View target = findFrontmostDroppableChildAt(event.mX, event.mY, mLocalPoint); 1237 if (target != null) { 1238 if (ViewDebug.DEBUG_DRAG) Log.d(View.VIEW_LOG_TAG, " dispatch drop to " + target); 1239 event.mX = mLocalPoint.x; 1240 event.mY = mLocalPoint.y; 1241 retval = target.dispatchDragEvent(event); 1242 event.mX = tx; 1243 event.mY = ty; 1244 } else { 1245 if (ViewDebug.DEBUG_DRAG) { 1246 Log.d(View.VIEW_LOG_TAG, " not dropped on an accepting view"); 1247 } 1248 } 1249 } break; 1250 } 1251 1252 // If none of our children could handle the event, try here 1253 if (!retval) { 1254 // Call up to the View implementation that dispatches to installed listeners 1255 retval = super.dispatchDragEvent(event); 1256 } 1257 return retval; 1258 } 1259 1260 // Find the frontmost child view that lies under the given point, and calculate 1261 // the position within its own local coordinate system. 1262 View findFrontmostDroppableChildAt(float x, float y, PointF outLocalPoint) { 1263 final int count = mChildrenCount; 1264 final View[] children = mChildren; 1265 for (int i = count - 1; i >= 0; i--) { 1266 final View child = children[i]; 1267 if (!child.canAcceptDrag()) { 1268 continue; 1269 } 1270 1271 if (isTransformedTouchPointInView(x, y, child, outLocalPoint)) { 1272 return child; 1273 } 1274 } 1275 return null; 1276 } 1277 1278 boolean notifyChildOfDrag(View child) { 1279 if (ViewDebug.DEBUG_DRAG) { 1280 Log.d(View.VIEW_LOG_TAG, "Sending drag-started to view: " + child); 1281 } 1282 1283 boolean canAccept = false; 1284 if (! mDragNotifiedChildren.contains(child)) { 1285 mDragNotifiedChildren.add(child); 1286 canAccept = child.dispatchDragEvent(mCurrentDrag); 1287 if (canAccept && !child.canAcceptDrag()) { 1288 child.mPrivateFlags2 |= View.DRAG_CAN_ACCEPT; 1289 child.refreshDrawableState(); 1290 } 1291 } 1292 return canAccept; 1293 } 1294 1295 @Override 1296 public void dispatchWindowSystemUiVisiblityChanged(int visible) { 1297 super.dispatchWindowSystemUiVisiblityChanged(visible); 1298 1299 final int count = mChildrenCount; 1300 final View[] children = mChildren; 1301 for (int i=0; i <count; i++) { 1302 final View child = children[i]; 1303 child.dispatchWindowSystemUiVisiblityChanged(visible); 1304 } 1305 } 1306 1307 @Override 1308 public void dispatchSystemUiVisibilityChanged(int visible) { 1309 super.dispatchSystemUiVisibilityChanged(visible); 1310 1311 final int count = mChildrenCount; 1312 final View[] children = mChildren; 1313 for (int i=0; i <count; i++) { 1314 final View child = children[i]; 1315 child.dispatchSystemUiVisibilityChanged(visible); 1316 } 1317 } 1318 1319 @Override 1320 void updateLocalSystemUiVisibility(int localValue, int localChanges) { 1321 super.updateLocalSystemUiVisibility(localValue, localChanges); 1322 1323 final int count = mChildrenCount; 1324 final View[] children = mChildren; 1325 for (int i=0; i <count; i++) { 1326 final View child = children[i]; 1327 child.updateLocalSystemUiVisibility(localValue, localChanges); 1328 } 1329 } 1330 1331 /** 1332 * {@inheritDoc} 1333 */ 1334 @Override 1335 public boolean dispatchKeyEventPreIme(KeyEvent event) { 1336 if ((mPrivateFlags & (FOCUSED | HAS_BOUNDS)) == (FOCUSED | HAS_BOUNDS)) { 1337 return super.dispatchKeyEventPreIme(event); 1338 } else if (mFocused != null && (mFocused.mPrivateFlags & HAS_BOUNDS) == HAS_BOUNDS) { 1339 return mFocused.dispatchKeyEventPreIme(event); 1340 } 1341 return false; 1342 } 1343 1344 /** 1345 * {@inheritDoc} 1346 */ 1347 @Override 1348 public boolean dispatchKeyEvent(KeyEvent event) { 1349 if (mInputEventConsistencyVerifier != null) { 1350 mInputEventConsistencyVerifier.onKeyEvent(event, 1); 1351 } 1352 1353 if ((mPrivateFlags & (FOCUSED | HAS_BOUNDS)) == (FOCUSED | HAS_BOUNDS)) { 1354 if (super.dispatchKeyEvent(event)) { 1355 return true; 1356 } 1357 } else if (mFocused != null && (mFocused.mPrivateFlags & HAS_BOUNDS) == HAS_BOUNDS) { 1358 if (mFocused.dispatchKeyEvent(event)) { 1359 return true; 1360 } 1361 } 1362 1363 if (mInputEventConsistencyVerifier != null) { 1364 mInputEventConsistencyVerifier.onUnhandledEvent(event, 1); 1365 } 1366 return false; 1367 } 1368 1369 /** 1370 * {@inheritDoc} 1371 */ 1372 @Override 1373 public boolean dispatchKeyShortcutEvent(KeyEvent event) { 1374 if ((mPrivateFlags & (FOCUSED | HAS_BOUNDS)) == (FOCUSED | HAS_BOUNDS)) { 1375 return super.dispatchKeyShortcutEvent(event); 1376 } else if (mFocused != null && (mFocused.mPrivateFlags & HAS_BOUNDS) == HAS_BOUNDS) { 1377 return mFocused.dispatchKeyShortcutEvent(event); 1378 } 1379 return false; 1380 } 1381 1382 /** 1383 * {@inheritDoc} 1384 */ 1385 @Override 1386 public boolean dispatchTrackballEvent(MotionEvent event) { 1387 if (mInputEventConsistencyVerifier != null) { 1388 mInputEventConsistencyVerifier.onTrackballEvent(event, 1); 1389 } 1390 1391 if ((mPrivateFlags & (FOCUSED | HAS_BOUNDS)) == (FOCUSED | HAS_BOUNDS)) { 1392 if (super.dispatchTrackballEvent(event)) { 1393 return true; 1394 } 1395 } else if (mFocused != null && (mFocused.mPrivateFlags & HAS_BOUNDS) == HAS_BOUNDS) { 1396 if (mFocused.dispatchTrackballEvent(event)) { 1397 return true; 1398 } 1399 } 1400 1401 if (mInputEventConsistencyVerifier != null) { 1402 mInputEventConsistencyVerifier.onUnhandledEvent(event, 1); 1403 } 1404 return false; 1405 } 1406 1407 /** 1408 * {@inheritDoc} 1409 */ 1410 @SuppressWarnings({"ConstantConditions"}) 1411 @Override 1412 protected boolean dispatchHoverEvent(MotionEvent event) { 1413 final int action = event.getAction(); 1414 1415 // First check whether the view group wants to intercept the hover event. 1416 final boolean interceptHover = onInterceptHoverEvent(event); 1417 event.setAction(action); // restore action in case it was changed 1418 1419 MotionEvent eventNoHistory = event; 1420 boolean handled = false; 1421 1422 // Send events to the hovered children and build a new list of hover targets until 1423 // one is found that handles the event. 1424 HoverTarget firstOldHoverTarget = mFirstHoverTarget; 1425 mFirstHoverTarget = null; 1426 if (!interceptHover && action != MotionEvent.ACTION_HOVER_EXIT) { 1427 final float x = event.getX(); 1428 final float y = event.getY(); 1429 final int childrenCount = mChildrenCount; 1430 if (childrenCount != 0) { 1431 final View[] children = mChildren; 1432 HoverTarget lastHoverTarget = null; 1433 for (int i = childrenCount - 1; i >= 0; i--) { 1434 final View child = children[i]; 1435 if (!canViewReceivePointerEvents(child) 1436 || !isTransformedTouchPointInView(x, y, child, null)) { 1437 continue; 1438 } 1439 1440 // Obtain a hover target for this child. Dequeue it from the 1441 // old hover target list if the child was previously hovered. 1442 HoverTarget hoverTarget = firstOldHoverTarget; 1443 final boolean wasHovered; 1444 for (HoverTarget predecessor = null; ;) { 1445 if (hoverTarget == null) { 1446 hoverTarget = HoverTarget.obtain(child); 1447 wasHovered = false; 1448 break; 1449 } 1450 1451 if (hoverTarget.child == child) { 1452 if (predecessor != null) { 1453 predecessor.next = hoverTarget.next; 1454 } else { 1455 firstOldHoverTarget = hoverTarget.next; 1456 } 1457 hoverTarget.next = null; 1458 wasHovered = true; 1459 break; 1460 } 1461 1462 predecessor = hoverTarget; 1463 hoverTarget = hoverTarget.next; 1464 } 1465 1466 // Enqueue the hover target onto the new hover target list. 1467 if (lastHoverTarget != null) { 1468 lastHoverTarget.next = hoverTarget; 1469 } else { 1470 lastHoverTarget = hoverTarget; 1471 mFirstHoverTarget = hoverTarget; 1472 } 1473 1474 // Dispatch the event to the child. 1475 if (action == MotionEvent.ACTION_HOVER_ENTER) { 1476 if (!wasHovered) { 1477 // Send the enter as is. 1478 handled |= dispatchTransformedGenericPointerEvent( 1479 event, child); // enter 1480 } 1481 } else if (action == MotionEvent.ACTION_HOVER_MOVE) { 1482 if (!wasHovered) { 1483 // Synthesize an enter from a move. 1484 eventNoHistory = obtainMotionEventNoHistoryOrSelf(eventNoHistory); 1485 eventNoHistory.setAction(MotionEvent.ACTION_HOVER_ENTER); 1486 handled |= dispatchTransformedGenericPointerEvent( 1487 eventNoHistory, child); // enter 1488 eventNoHistory.setAction(action); 1489 1490 handled |= dispatchTransformedGenericPointerEvent( 1491 eventNoHistory, child); // move 1492 } else { 1493 // Send the move as is. 1494 handled |= dispatchTransformedGenericPointerEvent(event, child); 1495 } 1496 } 1497 if (handled) { 1498 break; 1499 } 1500 } 1501 } 1502 } 1503 1504 // Send exit events to all previously hovered children that are no longer hovered. 1505 while (firstOldHoverTarget != null) { 1506 final View child = firstOldHoverTarget.child; 1507 1508 // Exit the old hovered child. 1509 if (action == MotionEvent.ACTION_HOVER_EXIT) { 1510 // Send the exit as is. 1511 handled |= dispatchTransformedGenericPointerEvent( 1512 event, child); // exit 1513 } else { 1514 // Synthesize an exit from a move or enter. 1515 // Ignore the result because hover focus has moved to a different view. 1516 if (action == MotionEvent.ACTION_HOVER_MOVE) { 1517 dispatchTransformedGenericPointerEvent( 1518 event, child); // move 1519 } 1520 eventNoHistory = obtainMotionEventNoHistoryOrSelf(eventNoHistory); 1521 eventNoHistory.setAction(MotionEvent.ACTION_HOVER_EXIT); 1522 dispatchTransformedGenericPointerEvent( 1523 eventNoHistory, child); // exit 1524 eventNoHistory.setAction(action); 1525 } 1526 1527 final HoverTarget nextOldHoverTarget = firstOldHoverTarget.next; 1528 firstOldHoverTarget.recycle(); 1529 firstOldHoverTarget = nextOldHoverTarget; 1530 } 1531 1532 // Send events to the view group itself if no children have handled it. 1533 boolean newHoveredSelf = !handled; 1534 if (newHoveredSelf == mHoveredSelf) { 1535 if (newHoveredSelf) { 1536 // Send event to the view group as before. 1537 handled |= super.dispatchHoverEvent(event); 1538 } 1539 } else { 1540 if (mHoveredSelf) { 1541 // Exit the view group. 1542 if (action == MotionEvent.ACTION_HOVER_EXIT) { 1543 // Send the exit as is. 1544 handled |= super.dispatchHoverEvent(event); // exit 1545 } else { 1546 // Synthesize an exit from a move or enter. 1547 // Ignore the result because hover focus is moving to a different view. 1548 if (action == MotionEvent.ACTION_HOVER_MOVE) { 1549 super.dispatchHoverEvent(event); // move 1550 } 1551 eventNoHistory = obtainMotionEventNoHistoryOrSelf(eventNoHistory); 1552 eventNoHistory.setAction(MotionEvent.ACTION_HOVER_EXIT); 1553 super.dispatchHoverEvent(eventNoHistory); // exit 1554 eventNoHistory.setAction(action); 1555 } 1556 mHoveredSelf = false; 1557 } 1558 1559 if (newHoveredSelf) { 1560 // Enter the view group. 1561 if (action == MotionEvent.ACTION_HOVER_ENTER) { 1562 // Send the enter as is. 1563 handled |= super.dispatchHoverEvent(event); // enter 1564 mHoveredSelf = true; 1565 } else if (action == MotionEvent.ACTION_HOVER_MOVE) { 1566 // Synthesize an enter from a move. 1567 eventNoHistory = obtainMotionEventNoHistoryOrSelf(eventNoHistory); 1568 eventNoHistory.setAction(MotionEvent.ACTION_HOVER_ENTER); 1569 handled |= super.dispatchHoverEvent(eventNoHistory); // enter 1570 eventNoHistory.setAction(action); 1571 1572 handled |= super.dispatchHoverEvent(eventNoHistory); // move 1573 mHoveredSelf = true; 1574 } 1575 } 1576 } 1577 1578 // Recycle the copy of the event that we made. 1579 if (eventNoHistory != event) { 1580 eventNoHistory.recycle(); 1581 } 1582 1583 // Done. 1584 return handled; 1585 } 1586 1587 private void exitHoverTargets() { 1588 if (mHoveredSelf || mFirstHoverTarget != null) { 1589 final long now = SystemClock.uptimeMillis(); 1590 MotionEvent event = MotionEvent.obtain(now, now, 1591 MotionEvent.ACTION_HOVER_EXIT, 0.0f, 0.0f, 0); 1592 event.setSource(InputDevice.SOURCE_TOUCHSCREEN); 1593 dispatchHoverEvent(event); 1594 event.recycle(); 1595 } 1596 } 1597 1598 private void cancelHoverTarget(View view) { 1599 HoverTarget predecessor = null; 1600 HoverTarget target = mFirstHoverTarget; 1601 while (target != null) { 1602 final HoverTarget next = target.next; 1603 if (target.child == view) { 1604 if (predecessor == null) { 1605 mFirstHoverTarget = next; 1606 } else { 1607 predecessor.next = next; 1608 } 1609 target.recycle(); 1610 1611 final long now = SystemClock.uptimeMillis(); 1612 MotionEvent event = MotionEvent.obtain(now, now, 1613 MotionEvent.ACTION_HOVER_EXIT, 0.0f, 0.0f, 0); 1614 event.setSource(InputDevice.SOURCE_TOUCHSCREEN); 1615 view.dispatchHoverEvent(event); 1616 event.recycle(); 1617 return; 1618 } 1619 predecessor = target; 1620 target = next; 1621 } 1622 } 1623 1624 /** @hide */ 1625 @Override 1626 protected boolean hasHoveredChild() { 1627 return mFirstHoverTarget != null; 1628 } 1629 1630 @Override 1631 public void addChildrenForAccessibility(ArrayList<View> childrenForAccessibility) { 1632 ChildListForAccessibility children = ChildListForAccessibility.obtain(this, true); 1633 try { 1634 final int childrenCount = children.getChildCount(); 1635 for (int i = 0; i < childrenCount; i++) { 1636 View child = children.getChildAt(i); 1637 if ((child.mViewFlags & VISIBILITY_MASK) == VISIBLE 1638 && (child.mPrivateFlags & IS_ROOT_NAMESPACE) == 0) { 1639 if (child.includeForAccessibility()) { 1640 childrenForAccessibility.add(child); 1641 } else { 1642 child.addChildrenForAccessibility(childrenForAccessibility); 1643 } 1644 } 1645 } 1646 } finally { 1647 children.recycle(); 1648 } 1649 } 1650 1651 /** 1652 * @hide 1653 */ 1654 @Override 1655 public void childAccessibilityStateChanged(View child) { 1656 if (mParent != null) { 1657 mParent.childAccessibilityStateChanged(child); 1658 } 1659 } 1660 1661 /** 1662 * Implement this method to intercept hover events before they are handled 1663 * by child views. 1664 * <p> 1665 * This method is called before dispatching a hover event to a child of 1666 * the view group or to the view group's own {@link #onHoverEvent} to allow 1667 * the view group a chance to intercept the hover event. 1668 * This method can also be used to watch all pointer motions that occur within 1669 * the bounds of the view group even when the pointer is hovering over 1670 * a child of the view group rather than over the view group itself. 1671 * </p><p> 1672 * The view group can prevent its children from receiving hover events by 1673 * implementing this method and returning <code>true</code> to indicate 1674 * that it would like to intercept hover events. The view group must 1675 * continuously return <code>true</code> from {@link #onInterceptHoverEvent} 1676 * for as long as it wishes to continue intercepting hover events from 1677 * its children. 1678 * </p><p> 1679 * Interception preserves the invariant that at most one view can be 1680 * hovered at a time by transferring hover focus from the currently hovered 1681 * child to the view group or vice-versa as needed. 1682 * </p><p> 1683 * If this method returns <code>true</code> and a child is already hovered, then the 1684 * child view will first receive a hover exit event and then the view group 1685 * itself will receive a hover enter event in {@link #onHoverEvent}. 1686 * Likewise, if this method had previously returned <code>true</code> to intercept hover 1687 * events and instead returns <code>false</code> while the pointer is hovering 1688 * within the bounds of one of a child, then the view group will first receive a 1689 * hover exit event in {@link #onHoverEvent} and then the hovered child will 1690 * receive a hover enter event. 1691 * </p><p> 1692 * The default implementation always returns false. 1693 * </p> 1694 * 1695 * @param event The motion event that describes the hover. 1696 * @return True if the view group would like to intercept the hover event 1697 * and prevent its children from receiving it. 1698 */ 1699 public boolean onInterceptHoverEvent(MotionEvent event) { 1700 return false; 1701 } 1702 1703 private static MotionEvent obtainMotionEventNoHistoryOrSelf(MotionEvent event) { 1704 if (event.getHistorySize() == 0) { 1705 return event; 1706 } 1707 return MotionEvent.obtainNoHistory(event); 1708 } 1709 1710 /** 1711 * {@inheritDoc} 1712 */ 1713 @Override 1714 protected boolean dispatchGenericPointerEvent(MotionEvent event) { 1715 // Send the event to the child under the pointer. 1716 final int childrenCount = mChildrenCount; 1717 if (childrenCount != 0) { 1718 final View[] children = mChildren; 1719 final float x = event.getX(); 1720 final float y = event.getY(); 1721 1722 for (int i = childrenCount - 1; i >= 0; i--) { 1723 final View child = children[i]; 1724 if (!canViewReceivePointerEvents(child) 1725 || !isTransformedTouchPointInView(x, y, child, null)) { 1726 continue; 1727 } 1728 1729 if (dispatchTransformedGenericPointerEvent(event, child)) { 1730 return true; 1731 } 1732 } 1733 } 1734 1735 // No child handled the event. Send it to this view group. 1736 return super.dispatchGenericPointerEvent(event); 1737 } 1738 1739 /** 1740 * {@inheritDoc} 1741 */ 1742 @Override 1743 protected boolean dispatchGenericFocusedEvent(MotionEvent event) { 1744 // Send the event to the focused child or to this view group if it has focus. 1745 if ((mPrivateFlags & (FOCUSED | HAS_BOUNDS)) == (FOCUSED | HAS_BOUNDS)) { 1746 return super.dispatchGenericFocusedEvent(event); 1747 } else if (mFocused != null && (mFocused.mPrivateFlags & HAS_BOUNDS) == HAS_BOUNDS) { 1748 return mFocused.dispatchGenericMotionEvent(event); 1749 } 1750 return false; 1751 } 1752 1753 /** 1754 * Dispatches a generic pointer event to a child, taking into account 1755 * transformations that apply to the child. 1756 * 1757 * @param event The event to send. 1758 * @param child The view to send the event to. 1759 * @return {@code true} if the child handled the event. 1760 */ 1761 private boolean dispatchTransformedGenericPointerEvent(MotionEvent event, View child) { 1762 final float offsetX = mScrollX - child.mLeft; 1763 final float offsetY = mScrollY - child.mTop; 1764 1765 boolean handled; 1766 if (!child.hasIdentityMatrix()) { 1767 MotionEvent transformedEvent = MotionEvent.obtain(event); 1768 transformedEvent.offsetLocation(offsetX, offsetY); 1769 transformedEvent.transform(child.getInverseMatrix()); 1770 handled = child.dispatchGenericMotionEvent(transformedEvent); 1771 transformedEvent.recycle(); 1772 } else { 1773 event.offsetLocation(offsetX, offsetY); 1774 handled = child.dispatchGenericMotionEvent(event); 1775 event.offsetLocation(-offsetX, -offsetY); 1776 } 1777 return handled; 1778 } 1779 1780 /** 1781 * {@inheritDoc} 1782 */ 1783 @Override 1784 public boolean dispatchTouchEvent(MotionEvent ev) { 1785 if (mInputEventConsistencyVerifier != null) { 1786 mInputEventConsistencyVerifier.onTouchEvent(ev, 1); 1787 } 1788 1789 boolean handled = false; 1790 if (onFilterTouchEventForSecurity(ev)) { 1791 final int action = ev.getAction(); 1792 final int actionMasked = action & MotionEvent.ACTION_MASK; 1793 1794 // Handle an initial down. 1795 if (actionMasked == MotionEvent.ACTION_DOWN) { 1796 // Throw away all previous state when starting a new touch gesture. 1797 // The framework may have dropped the up or cancel event for the previous gesture 1798 // due to an app switch, ANR, or some other state change. 1799 cancelAndClearTouchTargets(ev); 1800 resetTouchState(); 1801 } 1802 1803 // Check for interception. 1804 final boolean intercepted; 1805 if (actionMasked == MotionEvent.ACTION_DOWN 1806 || mFirstTouchTarget != null) { 1807 final boolean disallowIntercept = (mGroupFlags & FLAG_DISALLOW_INTERCEPT) != 0; 1808 if (!disallowIntercept) { 1809 intercepted = onInterceptTouchEvent(ev); 1810 ev.setAction(action); // restore action in case it was changed 1811 } else { 1812 intercepted = false; 1813 } 1814 } else { 1815 // There are no touch targets and this action is not an initial down 1816 // so this view group continues to intercept touches. 1817 intercepted = true; 1818 } 1819 1820 // Check for cancelation. 1821 final boolean canceled = resetCancelNextUpFlag(this) 1822 || actionMasked == MotionEvent.ACTION_CANCEL; 1823 1824 // Update list of touch targets for pointer down, if needed. 1825 final boolean split = (mGroupFlags & FLAG_SPLIT_MOTION_EVENTS) != 0; 1826 TouchTarget newTouchTarget = null; 1827 boolean alreadyDispatchedToNewTouchTarget = false; 1828 if (!canceled && !intercepted) { 1829 if (actionMasked == MotionEvent.ACTION_DOWN 1830 || (split && actionMasked == MotionEvent.ACTION_POINTER_DOWN) 1831 || actionMasked == MotionEvent.ACTION_HOVER_MOVE) { 1832 final int actionIndex = ev.getActionIndex(); // always 0 for down 1833 final int idBitsToAssign = split ? 1 << ev.getPointerId(actionIndex) 1834 : TouchTarget.ALL_POINTER_IDS; 1835 1836 // Clean up earlier touch targets for this pointer id in case they 1837 // have become out of sync. 1838 removePointersFromTouchTargets(idBitsToAssign); 1839 1840 final int childrenCount = mChildrenCount; 1841 if (childrenCount != 0) { 1842 // Find a child that can receive the event. 1843 // Scan children from front to back. 1844 final View[] children = mChildren; 1845 final float x = ev.getX(actionIndex); 1846 final float y = ev.getY(actionIndex); 1847 1848 for (int i = childrenCount - 1; i >= 0; i--) { 1849 final View child = children[i]; 1850 if (!canViewReceivePointerEvents(child) 1851 || !isTransformedTouchPointInView(x, y, child, null)) { 1852 continue; 1853 } 1854 1855 newTouchTarget = getTouchTarget(child); 1856 if (newTouchTarget != null) { 1857 // Child is already receiving touch within its bounds. 1858 // Give it the new pointer in addition to the ones it is handling. 1859 newTouchTarget.pointerIdBits |= idBitsToAssign; 1860 break; 1861 } 1862 1863 resetCancelNextUpFlag(child); 1864 if (dispatchTransformedTouchEvent(ev, false, child, idBitsToAssign)) { 1865 // Child wants to receive touch within its bounds. 1866 mLastTouchDownTime = ev.getDownTime(); 1867 mLastTouchDownIndex = i; 1868 mLastTouchDownX = ev.getX(); 1869 mLastTouchDownY = ev.getY(); 1870 newTouchTarget = addTouchTarget(child, idBitsToAssign); 1871 alreadyDispatchedToNewTouchTarget = true; 1872 break; 1873 } 1874 } 1875 } 1876 1877 if (newTouchTarget == null && mFirstTouchTarget != null) { 1878 // Did not find a child to receive the event. 1879 // Assign the pointer to the least recently added target. 1880 newTouchTarget = mFirstTouchTarget; 1881 while (newTouchTarget.next != null) { 1882 newTouchTarget = newTouchTarget.next; 1883 } 1884 newTouchTarget.pointerIdBits |= idBitsToAssign; 1885 } 1886 } 1887 } 1888 1889 // Dispatch to touch targets. 1890 if (mFirstTouchTarget == null) { 1891 // No touch targets so treat this as an ordinary view. 1892 handled = dispatchTransformedTouchEvent(ev, canceled, null, 1893 TouchTarget.ALL_POINTER_IDS); 1894 } else { 1895 // Dispatch to touch targets, excluding the new touch target if we already 1896 // dispatched to it. Cancel touch targets if necessary. 1897 TouchTarget predecessor = null; 1898 TouchTarget target = mFirstTouchTarget; 1899 while (target != null) { 1900 final TouchTarget next = target.next; 1901 if (alreadyDispatchedToNewTouchTarget && target == newTouchTarget) { 1902 handled = true; 1903 } else { 1904 final boolean cancelChild = resetCancelNextUpFlag(target.child) 1905 || intercepted; 1906 if (dispatchTransformedTouchEvent(ev, cancelChild, 1907 target.child, target.pointerIdBits)) { 1908 handled = true; 1909 } 1910 if (cancelChild) { 1911 if (predecessor == null) { 1912 mFirstTouchTarget = next; 1913 } else { 1914 predecessor.next = next; 1915 } 1916 target.recycle(); 1917 target = next; 1918 continue; 1919 } 1920 } 1921 predecessor = target; 1922 target = next; 1923 } 1924 } 1925 1926 // Update list of touch targets for pointer up or cancel, if needed. 1927 if (canceled 1928 || actionMasked == MotionEvent.ACTION_UP 1929 || actionMasked == MotionEvent.ACTION_HOVER_MOVE) { 1930 resetTouchState(); 1931 } else if (split && actionMasked == MotionEvent.ACTION_POINTER_UP) { 1932 final int actionIndex = ev.getActionIndex(); 1933 final int idBitsToRemove = 1 << ev.getPointerId(actionIndex); 1934 removePointersFromTouchTargets(idBitsToRemove); 1935 } 1936 } 1937 1938 if (!handled && mInputEventConsistencyVerifier != null) { 1939 mInputEventConsistencyVerifier.onUnhandledEvent(ev, 1); 1940 } 1941 return handled; 1942 } 1943 1944 /** 1945 * Resets all touch state in preparation for a new cycle. 1946 */ 1947 private void resetTouchState() { 1948 clearTouchTargets(); 1949 resetCancelNextUpFlag(this); 1950 mGroupFlags &= ~FLAG_DISALLOW_INTERCEPT; 1951 } 1952 1953 /** 1954 * Resets the cancel next up flag. 1955 * Returns true if the flag was previously set. 1956 */ 1957 private static boolean resetCancelNextUpFlag(View view) { 1958 if ((view.mPrivateFlags & CANCEL_NEXT_UP_EVENT) != 0) { 1959 view.mPrivateFlags &= ~CANCEL_NEXT_UP_EVENT; 1960 return true; 1961 } 1962 return false; 1963 } 1964 1965 /** 1966 * Clears all touch targets. 1967 */ 1968 private void clearTouchTargets() { 1969 TouchTarget target = mFirstTouchTarget; 1970 if (target != null) { 1971 do { 1972 TouchTarget next = target.next; 1973 target.recycle(); 1974 target = next; 1975 } while (target != null); 1976 mFirstTouchTarget = null; 1977 } 1978 } 1979 1980 /** 1981 * Cancels and clears all touch targets. 1982 */ 1983 private void cancelAndClearTouchTargets(MotionEvent event) { 1984 if (mFirstTouchTarget != null) { 1985 boolean syntheticEvent = false; 1986 if (event == null) { 1987 final long now = SystemClock.uptimeMillis(); 1988 event = MotionEvent.obtain(now, now, 1989 MotionEvent.ACTION_CANCEL, 0.0f, 0.0f, 0); 1990 event.setSource(InputDevice.SOURCE_TOUCHSCREEN); 1991 syntheticEvent = true; 1992 } 1993 1994 for (TouchTarget target = mFirstTouchTarget; target != null; target = target.next) { 1995 resetCancelNextUpFlag(target.child); 1996 dispatchTransformedTouchEvent(event, true, target.child, target.pointerIdBits); 1997 } 1998 clearTouchTargets(); 1999 2000 if (syntheticEvent) { 2001 event.recycle(); 2002 } 2003 } 2004 } 2005 2006 /** 2007 * Gets the touch target for specified child view. 2008 * Returns null if not found. 2009 */ 2010 private TouchTarget getTouchTarget(View child) { 2011 for (TouchTarget target = mFirstTouchTarget; target != null; target = target.next) { 2012 if (target.child == child) { 2013 return target; 2014 } 2015 } 2016 return null; 2017 } 2018 2019 /** 2020 * Adds a touch target for specified child to the beginning of the list. 2021 * Assumes the target child is not already present. 2022 */ 2023 private TouchTarget addTouchTarget(View child, int pointerIdBits) { 2024 TouchTarget target = TouchTarget.obtain(child, pointerIdBits); 2025 target.next = mFirstTouchTarget; 2026 mFirstTouchTarget = target; 2027 return target; 2028 } 2029 2030 /** 2031 * Removes the pointer ids from consideration. 2032 */ 2033 private void removePointersFromTouchTargets(int pointerIdBits) { 2034 TouchTarget predecessor = null; 2035 TouchTarget target = mFirstTouchTarget; 2036 while (target != null) { 2037 final TouchTarget next = target.next; 2038 if ((target.pointerIdBits & pointerIdBits) != 0) { 2039 target.pointerIdBits &= ~pointerIdBits; 2040 if (target.pointerIdBits == 0) { 2041 if (predecessor == null) { 2042 mFirstTouchTarget = next; 2043 } else { 2044 predecessor.next = next; 2045 } 2046 target.recycle(); 2047 target = next; 2048 continue; 2049 } 2050 } 2051 predecessor = target; 2052 target = next; 2053 } 2054 } 2055 2056 private void cancelTouchTarget(View view) { 2057 TouchTarget predecessor = null; 2058 TouchTarget target = mFirstTouchTarget; 2059 while (target != null) { 2060 final TouchTarget next = target.next; 2061 if (target.child == view) { 2062 if (predecessor == null) { 2063 mFirstTouchTarget = next; 2064 } else { 2065 predecessor.next = next; 2066 } 2067 target.recycle(); 2068 2069 final long now = SystemClock.uptimeMillis(); 2070 MotionEvent event = MotionEvent.obtain(now, now, 2071 MotionEvent.ACTION_CANCEL, 0.0f, 0.0f, 0); 2072 event.setSource(InputDevice.SOURCE_TOUCHSCREEN); 2073 view.dispatchTouchEvent(event); 2074 event.recycle(); 2075 return; 2076 } 2077 predecessor = target; 2078 target = next; 2079 } 2080 } 2081 2082 /** 2083 * Returns true if a child view can receive pointer events. 2084 * @hide 2085 */ 2086 private static boolean canViewReceivePointerEvents(View child) { 2087 return (child.mViewFlags & VISIBILITY_MASK) == VISIBLE 2088 || child.getAnimation() != null; 2089 } 2090 2091 /** 2092 * Returns true if a child view contains the specified point when transformed 2093 * into its coordinate space. 2094 * Child must not be null. 2095 * @hide 2096 */ 2097 protected boolean isTransformedTouchPointInView(float x, float y, View child, 2098 PointF outLocalPoint) { 2099 float localX = x + mScrollX - child.mLeft; 2100 float localY = y + mScrollY - child.mTop; 2101 if (! child.hasIdentityMatrix() && mAttachInfo != null) { 2102 final float[] localXY = mAttachInfo.mTmpTransformLocation; 2103 localXY[0] = localX; 2104 localXY[1] = localY; 2105 child.getInverseMatrix().mapPoints(localXY); 2106 localX = localXY[0]; 2107 localY = localXY[1]; 2108 } 2109 final boolean isInView = child.pointInView(localX, localY); 2110 if (isInView && outLocalPoint != null) { 2111 outLocalPoint.set(localX, localY); 2112 } 2113 return isInView; 2114 } 2115 2116 /** 2117 * Transforms a motion event into the coordinate space of a particular child view, 2118 * filters out irrelevant pointer ids, and overrides its action if necessary. 2119 * If child is null, assumes the MotionEvent will be sent to this ViewGroup instead. 2120 */ 2121 private boolean dispatchTransformedTouchEvent(MotionEvent event, boolean cancel, 2122 View child, int desiredPointerIdBits) { 2123 final boolean handled; 2124 2125 // Canceling motions is a special case. We don't need to perform any transformations 2126 // or filtering. The important part is the action, not the contents. 2127 final int oldAction = event.getAction(); 2128 if (cancel || oldAction == MotionEvent.ACTION_CANCEL) { 2129 event.setAction(MotionEvent.ACTION_CANCEL); 2130 if (child == null) { 2131 handled = super.dispatchTouchEvent(event); 2132 } else { 2133 handled = child.dispatchTouchEvent(event); 2134 } 2135 event.setAction(oldAction); 2136 return handled; 2137 } 2138 2139 // Calculate the number of pointers to deliver. 2140 final int oldPointerIdBits = event.getPointerIdBits(); 2141 final int newPointerIdBits = oldPointerIdBits & desiredPointerIdBits; 2142 2143 // If for some reason we ended up in an inconsistent state where it looks like we 2144 // might produce a motion event with no pointers in it, then drop the event. 2145 if (newPointerIdBits == 0) { 2146 return false; 2147 } 2148 2149 // If the number of pointers is the same and we don't need to perform any fancy 2150 // irreversible transformations, then we can reuse the motion event for this 2151 // dispatch as long as we are careful to revert any changes we make. 2152 // Otherwise we need to make a copy. 2153 final MotionEvent transformedEvent; 2154 if (newPointerIdBits == oldPointerIdBits) { 2155 if (child == null || child.hasIdentityMatrix()) { 2156 if (child == null) { 2157 handled = super.dispatchTouchEvent(event); 2158 } else { 2159 final float offsetX = mScrollX - child.mLeft; 2160 final float offsetY = mScrollY - child.mTop; 2161 event.offsetLocation(offsetX, offsetY); 2162 2163 handled = child.dispatchTouchEvent(event); 2164 2165 event.offsetLocation(-offsetX, -offsetY); 2166 } 2167 return handled; 2168 } 2169 transformedEvent = MotionEvent.obtain(event); 2170 } else { 2171 transformedEvent = event.split(newPointerIdBits); 2172 } 2173 2174 // Perform any necessary transformations and dispatch. 2175 if (child == null) { 2176 handled = super.dispatchTouchEvent(transformedEvent); 2177 } else { 2178 final float offsetX = mScrollX - child.mLeft; 2179 final float offsetY = mScrollY - child.mTop; 2180 transformedEvent.offsetLocation(offsetX, offsetY); 2181 if (! child.hasIdentityMatrix()) { 2182 transformedEvent.transform(child.getInverseMatrix()); 2183 } 2184 2185 handled = child.dispatchTouchEvent(transformedEvent); 2186 } 2187 2188 // Done. 2189 transformedEvent.recycle(); 2190 return handled; 2191 } 2192 2193 /** 2194 * Enable or disable the splitting of MotionEvents to multiple children during touch event 2195 * dispatch. This behavior is enabled by default for applications that target an 2196 * SDK version of {@link Build.VERSION_CODES#HONEYCOMB} or newer. 2197 * 2198 * <p>When this option is enabled MotionEvents may be split and dispatched to different child 2199 * views depending on where each pointer initially went down. This allows for user interactions 2200 * such as scrolling two panes of content independently, chording of buttons, and performing 2201 * independent gestures on different pieces of content. 2202 * 2203 * @param split <code>true</code> to allow MotionEvents to be split and dispatched to multiple 2204 * child views. <code>false</code> to only allow one child view to be the target of 2205 * any MotionEvent received by this ViewGroup. 2206 */ 2207 public void setMotionEventSplittingEnabled(boolean split) { 2208 // TODO Applications really shouldn't change this setting mid-touch event, 2209 // but perhaps this should handle that case and send ACTION_CANCELs to any child views 2210 // with gestures in progress when this is changed. 2211 if (split) { 2212 mGroupFlags |= FLAG_SPLIT_MOTION_EVENTS; 2213 } else { 2214 mGroupFlags &= ~FLAG_SPLIT_MOTION_EVENTS; 2215 } 2216 } 2217 2218 /** 2219 * Returns true if MotionEvents dispatched to this ViewGroup can be split to multiple children. 2220 * @return true if MotionEvents dispatched to this ViewGroup can be split to multiple children. 2221 */ 2222 public boolean isMotionEventSplittingEnabled() { 2223 return (mGroupFlags & FLAG_SPLIT_MOTION_EVENTS) == FLAG_SPLIT_MOTION_EVENTS; 2224 } 2225 2226 /** 2227 * {@inheritDoc} 2228 */ 2229 public void requestDisallowInterceptTouchEvent(boolean disallowIntercept) { 2230 2231 if (disallowIntercept == ((mGroupFlags & FLAG_DISALLOW_INTERCEPT) != 0)) { 2232 // We're already in this state, assume our ancestors are too 2233 return; 2234 } 2235 2236 if (disallowIntercept) { 2237 mGroupFlags |= FLAG_DISALLOW_INTERCEPT; 2238 } else { 2239 mGroupFlags &= ~FLAG_DISALLOW_INTERCEPT; 2240 } 2241 2242 // Pass it up to our parent 2243 if (mParent != null) { 2244 mParent.requestDisallowInterceptTouchEvent(disallowIntercept); 2245 } 2246 } 2247 2248 /** 2249 * Implement this method to intercept all touch screen motion events. This 2250 * allows you to watch events as they are dispatched to your children, and 2251 * take ownership of the current gesture at any point. 2252 * 2253 * <p>Using this function takes some care, as it has a fairly complicated 2254 * interaction with {@link View#onTouchEvent(MotionEvent) 2255 * View.onTouchEvent(MotionEvent)}, and using it requires implementing 2256 * that method as well as this one in the correct way. Events will be 2257 * received in the following order: 2258 * 2259 * <ol> 2260 * <li> You will receive the down event here. 2261 * <li> The down event will be handled either by a child of this view 2262 * group, or given to your own onTouchEvent() method to handle; this means 2263 * you should implement onTouchEvent() to return true, so you will 2264 * continue to see the rest of the gesture (instead of looking for 2265 * a parent view to handle it). Also, by returning true from 2266 * onTouchEvent(), you will not receive any following 2267 * events in onInterceptTouchEvent() and all touch processing must 2268 * happen in onTouchEvent() like normal. 2269 * <li> For as long as you return false from this function, each following 2270 * event (up to and including the final up) will be delivered first here 2271 * and then to the target's onTouchEvent(). 2272 * <li> If you return true from here, you will not receive any 2273 * following events: the target view will receive the same event but 2274 * with the action {@link MotionEvent#ACTION_CANCEL}, and all further 2275 * events will be delivered to your onTouchEvent() method and no longer 2276 * appear here. 2277 * </ol> 2278 * 2279 * @param ev The motion event being dispatched down the hierarchy. 2280 * @return Return true to steal motion events from the children and have 2281 * them dispatched to this ViewGroup through onTouchEvent(). 2282 * The current target will receive an ACTION_CANCEL event, and no further 2283 * messages will be delivered here. 2284 */ 2285 public boolean onInterceptTouchEvent(MotionEvent ev) { 2286 return false; 2287 } 2288 2289 /** 2290 * {@inheritDoc} 2291 * 2292 * Looks for a view to give focus to respecting the setting specified by 2293 * {@link #getDescendantFocusability()}. 2294 * 2295 * Uses {@link #onRequestFocusInDescendants(int, android.graphics.Rect)} to 2296 * find focus within the children of this group when appropriate. 2297 * 2298 * @see #FOCUS_BEFORE_DESCENDANTS 2299 * @see #FOCUS_AFTER_DESCENDANTS 2300 * @see #FOCUS_BLOCK_DESCENDANTS 2301 * @see #onRequestFocusInDescendants(int, android.graphics.Rect) 2302 */ 2303 @Override 2304 public boolean requestFocus(int direction, Rect previouslyFocusedRect) { 2305 if (DBG) { 2306 System.out.println(this + " ViewGroup.requestFocus direction=" 2307 + direction); 2308 } 2309 int descendantFocusability = getDescendantFocusability(); 2310 2311 switch (descendantFocusability) { 2312 case FOCUS_BLOCK_DESCENDANTS: 2313 return super.requestFocus(direction, previouslyFocusedRect); 2314 case FOCUS_BEFORE_DESCENDANTS: { 2315 final boolean took = super.requestFocus(direction, previouslyFocusedRect); 2316 return took ? took : onRequestFocusInDescendants(direction, previouslyFocusedRect); 2317 } 2318 case FOCUS_AFTER_DESCENDANTS: { 2319 final boolean took = onRequestFocusInDescendants(direction, previouslyFocusedRect); 2320 return took ? took : super.requestFocus(direction, previouslyFocusedRect); 2321 } 2322 default: 2323 throw new IllegalStateException("descendant focusability must be " 2324 + "one of FOCUS_BEFORE_DESCENDANTS, FOCUS_AFTER_DESCENDANTS, FOCUS_BLOCK_DESCENDANTS " 2325 + "but is " + descendantFocusability); 2326 } 2327 } 2328 2329 /** 2330 * Look for a descendant to call {@link View#requestFocus} on. 2331 * Called by {@link ViewGroup#requestFocus(int, android.graphics.Rect)} 2332 * when it wants to request focus within its children. Override this to 2333 * customize how your {@link ViewGroup} requests focus within its children. 2334 * @param direction One of FOCUS_UP, FOCUS_DOWN, FOCUS_LEFT, and FOCUS_RIGHT 2335 * @param previouslyFocusedRect The rectangle (in this View's coordinate system) 2336 * to give a finer grained hint about where focus is coming from. May be null 2337 * if there is no hint. 2338 * @return Whether focus was taken. 2339 */ 2340 @SuppressWarnings({"ConstantConditions"}) 2341 protected boolean onRequestFocusInDescendants(int direction, 2342 Rect previouslyFocusedRect) { 2343 int index; 2344 int increment; 2345 int end; 2346 int count = mChildrenCount; 2347 if ((direction & FOCUS_FORWARD) != 0) { 2348 index = 0; 2349 increment = 1; 2350 end = count; 2351 } else { 2352 index = count - 1; 2353 increment = -1; 2354 end = -1; 2355 } 2356 final View[] children = mChildren; 2357 for (int i = index; i != end; i += increment) { 2358 View child = children[i]; 2359 if ((child.mViewFlags & VISIBILITY_MASK) == VISIBLE) { 2360 if (child.requestFocus(direction, previouslyFocusedRect)) { 2361 return true; 2362 } 2363 } 2364 } 2365 return false; 2366 } 2367 2368 /** 2369 * {@inheritDoc} 2370 * 2371 * @hide 2372 */ 2373 @Override 2374 public void dispatchStartTemporaryDetach() { 2375 super.dispatchStartTemporaryDetach(); 2376 final int count = mChildrenCount; 2377 final View[] children = mChildren; 2378 for (int i = 0; i < count; i++) { 2379 children[i].dispatchStartTemporaryDetach(); 2380 } 2381 } 2382 2383 /** 2384 * {@inheritDoc} 2385 * 2386 * @hide 2387 */ 2388 @Override 2389 public void dispatchFinishTemporaryDetach() { 2390 super.dispatchFinishTemporaryDetach(); 2391 final int count = mChildrenCount; 2392 final View[] children = mChildren; 2393 for (int i = 0; i < count; i++) { 2394 children[i].dispatchFinishTemporaryDetach(); 2395 } 2396 } 2397 2398 /** 2399 * {@inheritDoc} 2400 */ 2401 @Override 2402 void dispatchAttachedToWindow(AttachInfo info, int visibility) { 2403 mGroupFlags |= FLAG_PREVENT_DISPATCH_ATTACHED_TO_WINDOW; 2404 super.dispatchAttachedToWindow(info, visibility); 2405 mGroupFlags &= ~FLAG_PREVENT_DISPATCH_ATTACHED_TO_WINDOW; 2406 2407 final int count = mChildrenCount; 2408 final View[] children = mChildren; 2409 for (int i = 0; i < count; i++) { 2410 final View child = children[i]; 2411 child.dispatchAttachedToWindow(info, 2412 visibility | (child.mViewFlags&VISIBILITY_MASK)); 2413 } 2414 } 2415 2416 @Override 2417 void dispatchScreenStateChanged(int screenState) { 2418 super.dispatchScreenStateChanged(screenState); 2419 2420 final int count = mChildrenCount; 2421 final View[] children = mChildren; 2422 for (int i = 0; i < count; i++) { 2423 children[i].dispatchScreenStateChanged(screenState); 2424 } 2425 } 2426 2427 @Override 2428 boolean dispatchPopulateAccessibilityEventInternal(AccessibilityEvent event) { 2429 boolean handled = false; 2430 if (includeForAccessibility()) { 2431 handled = super.dispatchPopulateAccessibilityEventInternal(event); 2432 if (handled) { 2433 return handled; 2434 } 2435 } 2436 // Let our children have a shot in populating the event. 2437 ChildListForAccessibility children = ChildListForAccessibility.obtain(this, true); 2438 try { 2439 final int childCount = children.getChildCount(); 2440 for (int i = 0; i < childCount; i++) { 2441 View child = children.getChildAt(i); 2442 if ((child.mViewFlags & VISIBILITY_MASK) == VISIBLE) { 2443 handled = child.dispatchPopulateAccessibilityEvent(event); 2444 if (handled) { 2445 return handled; 2446 } 2447 } 2448 } 2449 } finally { 2450 children.recycle(); 2451 } 2452 return false; 2453 } 2454 2455 @Override 2456 void onInitializeAccessibilityNodeInfoInternal(AccessibilityNodeInfo info) { 2457 super.onInitializeAccessibilityNodeInfoInternal(info); 2458 if (mAttachInfo != null) { 2459 ArrayList<View> childrenForAccessibility = mAttachInfo.mTempArrayList; 2460 childrenForAccessibility.clear(); 2461 addChildrenForAccessibility(childrenForAccessibility); 2462 final int childrenForAccessibilityCount = childrenForAccessibility.size(); 2463 for (int i = 0; i < childrenForAccessibilityCount; i++) { 2464 View child = childrenForAccessibility.get(i); 2465 info.addChild(child); 2466 } 2467 childrenForAccessibility.clear(); 2468 } 2469 } 2470 2471 @Override 2472 void onInitializeAccessibilityEventInternal(AccessibilityEvent event) { 2473 super.onInitializeAccessibilityEventInternal(event); 2474 event.setClassName(ViewGroup.class.getName()); 2475 } 2476 2477 /** 2478 * @hide 2479 */ 2480 @Override 2481 public void resetAccessibilityStateChanged() { 2482 super.resetAccessibilityStateChanged(); 2483 View[] children = mChildren; 2484 final int childCount = mChildrenCount; 2485 for (int i = 0; i < childCount; i++) { 2486 View child = children[i]; 2487 child.resetAccessibilityStateChanged(); 2488 } 2489 } 2490 2491 /** 2492 * {@inheritDoc} 2493 */ 2494 @Override 2495 void dispatchDetachedFromWindow() { 2496 // If we still have a touch target, we are still in the process of 2497 // dispatching motion events to a child; we need to get rid of that 2498 // child to avoid dispatching events to it after the window is torn 2499 // down. To make sure we keep the child in a consistent state, we 2500 // first send it an ACTION_CANCEL motion event. 2501 cancelAndClearTouchTargets(null); 2502 2503 // Similarly, set ACTION_EXIT to all hover targets and clear them. 2504 exitHoverTargets(); 2505 2506 // In case view is detached while transition is running 2507 mLayoutSuppressed = false; 2508 2509 // Tear down our drag tracking 2510 mDragNotifiedChildren = null; 2511 if (mCurrentDrag != null) { 2512 mCurrentDrag.recycle(); 2513 mCurrentDrag = null; 2514 } 2515 2516 final int count = mChildrenCount; 2517 final View[] children = mChildren; 2518 for (int i = 0; i < count; i++) { 2519 children[i].dispatchDetachedFromWindow(); 2520 } 2521 super.dispatchDetachedFromWindow(); 2522 } 2523 2524 /** 2525 * {@inheritDoc} 2526 */ 2527 @Override 2528 public void setPadding(int left, int top, int right, int bottom) { 2529 super.setPadding(left, top, right, bottom); 2530 2531 if ((mPaddingLeft | mPaddingTop | mPaddingRight | mPaddingBottom) != 0) { 2532 mGroupFlags |= FLAG_PADDING_NOT_NULL; 2533 } else { 2534 mGroupFlags &= ~FLAG_PADDING_NOT_NULL; 2535 } 2536 } 2537 2538 /** 2539 * {@inheritDoc} 2540 */ 2541 @Override 2542 protected void dispatchSaveInstanceState(SparseArray<Parcelable> container) { 2543 super.dispatchSaveInstanceState(container); 2544 final int count = mChildrenCount; 2545 final View[] children = mChildren; 2546 for (int i = 0; i < count; i++) { 2547 View c = children[i]; 2548 if ((c.mViewFlags & PARENT_SAVE_DISABLED_MASK) != PARENT_SAVE_DISABLED) { 2549 c.dispatchSaveInstanceState(container); 2550 } 2551 } 2552 } 2553 2554 /** 2555 * Perform dispatching of a {@link #saveHierarchyState(android.util.SparseArray)} freeze()} 2556 * to only this view, not to its children. For use when overriding 2557 * {@link #dispatchSaveInstanceState(android.util.SparseArray)} dispatchFreeze()} to allow 2558 * subclasses to freeze their own state but not the state of their children. 2559 * 2560 * @param container the container 2561 */ 2562 protected void dispatchFreezeSelfOnly(SparseArray<Parcelable> container) { 2563 super.dispatchSaveInstanceState(container); 2564 } 2565 2566 /** 2567 * {@inheritDoc} 2568 */ 2569 @Override 2570 protected void dispatchRestoreInstanceState(SparseArray<Parcelable> container) { 2571 super.dispatchRestoreInstanceState(container); 2572 final int count = mChildrenCount; 2573 final View[] children = mChildren; 2574 for (int i = 0; i < count; i++) { 2575 View c = children[i]; 2576 if ((c.mViewFlags & PARENT_SAVE_DISABLED_MASK) != PARENT_SAVE_DISABLED) { 2577 c.dispatchRestoreInstanceState(container); 2578 } 2579 } 2580 } 2581 2582 /** 2583 * Perform dispatching of a {@link #restoreHierarchyState(android.util.SparseArray)} 2584 * to only this view, not to its children. For use when overriding 2585 * {@link #dispatchRestoreInstanceState(android.util.SparseArray)} to allow 2586 * subclasses to thaw their own state but not the state of their children. 2587 * 2588 * @param container the container 2589 */ 2590 protected void dispatchThawSelfOnly(SparseArray<Parcelable> container) { 2591 super.dispatchRestoreInstanceState(container); 2592 } 2593 2594 /** 2595 * Enables or disables the drawing cache for each child of this view group. 2596 * 2597 * @param enabled true to enable the cache, false to dispose of it 2598 */ 2599 protected void setChildrenDrawingCacheEnabled(boolean enabled) { 2600 if (enabled || (mPersistentDrawingCache & PERSISTENT_ALL_CACHES) != PERSISTENT_ALL_CACHES) { 2601 final View[] children = mChildren; 2602 final int count = mChildrenCount; 2603 for (int i = 0; i < count; i++) { 2604 children[i].setDrawingCacheEnabled(enabled); 2605 } 2606 } 2607 } 2608 2609 @Override 2610 protected void onAnimationStart() { 2611 super.onAnimationStart(); 2612 2613 // When this ViewGroup's animation starts, build the cache for the children 2614 if ((mGroupFlags & FLAG_ANIMATION_CACHE) == FLAG_ANIMATION_CACHE) { 2615 final int count = mChildrenCount; 2616 final View[] children = mChildren; 2617 final boolean buildCache = !isHardwareAccelerated(); 2618 2619 for (int i = 0; i < count; i++) { 2620 final View child = children[i]; 2621 if ((child.mViewFlags & VISIBILITY_MASK) == VISIBLE) { 2622 child.setDrawingCacheEnabled(true); 2623 if (buildCache) { 2624 child.buildDrawingCache(true); 2625 } 2626 } 2627 } 2628 2629 mGroupFlags |= FLAG_CHILDREN_DRAWN_WITH_CACHE; 2630 } 2631 } 2632 2633 @Override 2634 protected void onAnimationEnd() { 2635 super.onAnimationEnd(); 2636 2637 // When this ViewGroup's animation ends, destroy the cache of the children 2638 if ((mGroupFlags & FLAG_ANIMATION_CACHE) == FLAG_ANIMATION_CACHE) { 2639 mGroupFlags &= ~FLAG_CHILDREN_DRAWN_WITH_CACHE; 2640 2641 if ((mPersistentDrawingCache & PERSISTENT_ANIMATION_CACHE) == 0) { 2642 setChildrenDrawingCacheEnabled(false); 2643 } 2644 } 2645 } 2646 2647 @Override 2648 Bitmap createSnapshot(Bitmap.Config quality, int backgroundColor, boolean skipChildren) { 2649 int count = mChildrenCount; 2650 int[] visibilities = null; 2651 2652 if (skipChildren) { 2653 visibilities = new int[count]; 2654 for (int i = 0; i < count; i++) { 2655 View child = getChildAt(i); 2656 visibilities[i] = child.getVisibility(); 2657 if (visibilities[i] == View.VISIBLE) { 2658 child.setVisibility(INVISIBLE); 2659 } 2660 } 2661 } 2662 2663 Bitmap b = super.createSnapshot(quality, backgroundColor, skipChildren); 2664 2665 if (skipChildren) { 2666 for (int i = 0; i < count; i++) { 2667 getChildAt(i).setVisibility(visibilities[i]); 2668 } 2669 } 2670 2671 return b; 2672 } 2673 2674 private static void drawRect(Canvas canvas, int x1, int y1, int x2, int y2, int color) { 2675 Paint paint = getDebugPaint(); 2676 paint.setColor(color); 2677 2678 canvas.drawLines(getDebugLines(x1, y1, x2, y2), paint); 2679 } 2680 2681 /** 2682 * @hide 2683 */ 2684 protected void onDebugDrawMargins(Canvas canvas) { 2685 for (int i = 0; i < getChildCount(); i++) { 2686 View c = getChildAt(i); 2687 c.getLayoutParams().onDebugDraw(c, canvas); 2688 } 2689 } 2690 2691 /** 2692 * @hide 2693 */ 2694 protected void onDebugDraw(Canvas canvas) { 2695 // Draw optical bounds 2696 if (getLayoutMode() == OPTICAL_BOUNDS) { 2697 for (int i = 0; i < getChildCount(); i++) { 2698 View c = getChildAt(i); 2699 Insets insets = c.getOpticalInsets(); 2700 drawRect(canvas, 2701 c.getLeft() + insets.left, 2702 c.getTop() + insets.top, 2703 c.getRight() - insets.right, 2704 c.getBottom() - insets.bottom, Color.RED); 2705 } 2706 } 2707 2708 // Draw margins 2709 onDebugDrawMargins(canvas); 2710 2711 // Draw bounds 2712 for (int i = 0; i < getChildCount(); i++) { 2713 View c = getChildAt(i); 2714 drawRect(canvas, c.getLeft(), c.getTop(), c.getRight(), c.getBottom(), Color.BLUE); 2715 } 2716 } 2717 2718 /** 2719 * {@inheritDoc} 2720 */ 2721 @Override 2722 protected void dispatchDraw(Canvas canvas) { 2723 final int count = mChildrenCount; 2724 final View[] children = mChildren; 2725 int flags = mGroupFlags; 2726 2727 if ((flags & FLAG_RUN_ANIMATION) != 0 && canAnimate()) { 2728 final boolean cache = (mGroupFlags & FLAG_ANIMATION_CACHE) == FLAG_ANIMATION_CACHE; 2729 2730 final boolean buildCache = !isHardwareAccelerated(); 2731 for (int i = 0; i < count; i++) { 2732 final View child = children[i]; 2733 if ((child.mViewFlags & VISIBILITY_MASK) == VISIBLE) { 2734 final LayoutParams params = child.getLayoutParams(); 2735 attachLayoutAnimationParameters(child, params, i, count); 2736 bindLayoutAnimation(child); 2737 if (cache) { 2738 child.setDrawingCacheEnabled(true); 2739 if (buildCache) { 2740 child.buildDrawingCache(true); 2741 } 2742 } 2743 } 2744 } 2745 2746 final LayoutAnimationController controller = mLayoutAnimationController; 2747 if (controller.willOverlap()) { 2748 mGroupFlags |= FLAG_OPTIMIZE_INVALIDATE; 2749 } 2750 2751 controller.start(); 2752 2753 mGroupFlags &= ~FLAG_RUN_ANIMATION; 2754 mGroupFlags &= ~FLAG_ANIMATION_DONE; 2755 2756 if (cache) { 2757 mGroupFlags |= FLAG_CHILDREN_DRAWN_WITH_CACHE; 2758 } 2759 2760 if (mAnimationListener != null) { 2761 mAnimationListener.onAnimationStart(controller.getAnimation()); 2762 } 2763 } 2764 2765 int saveCount = 0; 2766 final boolean clipToPadding = (flags & CLIP_TO_PADDING_MASK) == CLIP_TO_PADDING_MASK; 2767 if (clipToPadding) { 2768 saveCount = canvas.save(); 2769 canvas.clipRect(mScrollX + mPaddingLeft, mScrollY + mPaddingTop, 2770 mScrollX + mRight - mLeft - mPaddingRight, 2771 mScrollY + mBottom - mTop - mPaddingBottom); 2772 2773 } 2774 2775 // We will draw our child's animation, let's reset the flag 2776 mPrivateFlags &= ~DRAW_ANIMATION; 2777 mGroupFlags &= ~FLAG_INVALIDATE_REQUIRED; 2778 2779 boolean more = false; 2780 final long drawingTime = getDrawingTime(); 2781 2782 if ((flags & FLAG_USE_CHILD_DRAWING_ORDER) == 0) { 2783 for (int i = 0; i < count; i++) { 2784 final View child = children[i]; 2785 if ((child.mViewFlags & VISIBILITY_MASK) == VISIBLE || child.getAnimation() != null) { 2786 more |= drawChild(canvas, child, drawingTime); 2787 } 2788 } 2789 } else { 2790 for (int i = 0; i < count; i++) { 2791 final View child = children[getChildDrawingOrder(count, i)]; 2792 if ((child.mViewFlags & VISIBILITY_MASK) == VISIBLE || child.getAnimation() != null) { 2793 more |= drawChild(canvas, child, drawingTime); 2794 } 2795 } 2796 } 2797 2798 // Draw any disappearing views that have animations 2799 if (mDisappearingChildren != null) { 2800 final ArrayList<View> disappearingChildren = mDisappearingChildren; 2801 final int disappearingCount = disappearingChildren.size() - 1; 2802 // Go backwards -- we may delete as animations finish 2803 for (int i = disappearingCount; i >= 0; i--) { 2804 final View child = disappearingChildren.get(i); 2805 more |= drawChild(canvas, child, drawingTime); 2806 } 2807 } 2808 2809 if (debugDraw()) { 2810 onDebugDraw(canvas); 2811 } 2812 2813 if (clipToPadding) { 2814 canvas.restoreToCount(saveCount); 2815 } 2816 2817 // mGroupFlags might have been updated by drawChild() 2818 flags = mGroupFlags; 2819 2820 if ((flags & FLAG_INVALIDATE_REQUIRED) == FLAG_INVALIDATE_REQUIRED) { 2821 invalidate(true); 2822 } 2823 2824 if ((flags & FLAG_ANIMATION_DONE) == 0 && (flags & FLAG_NOTIFY_ANIMATION_LISTENER) == 0 && 2825 mLayoutAnimationController.isDone() && !more) { 2826 // We want to erase the drawing cache and notify the listener after the 2827 // next frame is drawn because one extra invalidate() is caused by 2828 // drawChild() after the animation is over 2829 mGroupFlags |= FLAG_NOTIFY_ANIMATION_LISTENER; 2830 final Runnable end = new Runnable() { 2831 public void run() { 2832 notifyAnimationListener(); 2833 } 2834 }; 2835 post(end); 2836 } 2837 } 2838 2839 /** 2840 * Returns the index of the child to draw for this iteration. Override this 2841 * if you want to change the drawing order of children. By default, it 2842 * returns i. 2843 * <p> 2844 * NOTE: In order for this method to be called, you must enable child ordering 2845 * first by calling {@link #setChildrenDrawingOrderEnabled(boolean)}. 2846 * 2847 * @param i The current iteration. 2848 * @return The index of the child to draw this iteration. 2849 * 2850 * @see #setChildrenDrawingOrderEnabled(boolean) 2851 * @see #isChildrenDrawingOrderEnabled() 2852 */ 2853 protected int getChildDrawingOrder(int childCount, int i) { 2854 return i; 2855 } 2856 2857 private void notifyAnimationListener() { 2858 mGroupFlags &= ~FLAG_NOTIFY_ANIMATION_LISTENER; 2859 mGroupFlags |= FLAG_ANIMATION_DONE; 2860 2861 if (mAnimationListener != null) { 2862 final Runnable end = new Runnable() { 2863 public void run() { 2864 mAnimationListener.onAnimationEnd(mLayoutAnimationController.getAnimation()); 2865 } 2866 }; 2867 post(end); 2868 } 2869 2870 if ((mGroupFlags & FLAG_ANIMATION_CACHE) == FLAG_ANIMATION_CACHE) { 2871 mGroupFlags &= ~FLAG_CHILDREN_DRAWN_WITH_CACHE; 2872 if ((mPersistentDrawingCache & PERSISTENT_ANIMATION_CACHE) == 0) { 2873 setChildrenDrawingCacheEnabled(false); 2874 } 2875 } 2876 2877 invalidate(true); 2878 } 2879 2880 /** 2881 * This method is used to cause children of this ViewGroup to restore or recreate their 2882 * display lists. It is called by getDisplayList() when the parent ViewGroup does not need 2883 * to recreate its own display list, which would happen if it went through the normal 2884 * draw/dispatchDraw mechanisms. 2885 * 2886 * @hide 2887 */ 2888 @Override 2889 protected void dispatchGetDisplayList() { 2890 final int count = mChildrenCount; 2891 final View[] children = mChildren; 2892 for (int i = 0; i < count; i++) { 2893 final View child = children[i]; 2894 if (((child.mViewFlags & VISIBILITY_MASK) == VISIBLE || child.getAnimation() != null) && 2895 child.hasStaticLayer()) { 2896 child.mRecreateDisplayList = (child.mPrivateFlags & INVALIDATED) == INVALIDATED; 2897 child.mPrivateFlags &= ~INVALIDATED; 2898 child.getDisplayList(); 2899 child.mRecreateDisplayList = false; 2900 } 2901 } 2902 } 2903 2904 /** 2905 * Draw one child of this View Group. This method is responsible for getting 2906 * the canvas in the right state. This includes clipping, translating so 2907 * that the child's scrolled origin is at 0, 0, and applying any animation 2908 * transformations. 2909 * 2910 * @param canvas The canvas on which to draw the child 2911 * @param child Who to draw 2912 * @param drawingTime The time at which draw is occurring 2913 * @return True if an invalidate() was issued 2914 */ 2915 protected boolean drawChild(Canvas canvas, View child, long drawingTime) { 2916 return child.draw(canvas, this, drawingTime); 2917 } 2918 2919 /** 2920 * 2921 * @param enabled True if children should be drawn with layers, false otherwise. 2922 * 2923 * @hide 2924 */ 2925 public void setChildrenLayersEnabled(boolean enabled) { 2926 if (enabled != mDrawLayers) { 2927 mDrawLayers = enabled; 2928 invalidate(true); 2929 2930 boolean flushLayers = !enabled; 2931 AttachInfo info = mAttachInfo; 2932 if (info != null && info.mHardwareRenderer != null && 2933 info.mHardwareRenderer.isEnabled()) { 2934 if (!info.mHardwareRenderer.validate()) { 2935 flushLayers = false; 2936 } 2937 } else { 2938 flushLayers = false; 2939 } 2940 2941 // We need to invalidate any child with a layer. For instance, 2942 // if a child is backed by a hardware layer and we disable layers 2943 // the child is marked as not dirty (flags cleared the last time 2944 // the child was drawn inside its layer.) However, that child might 2945 // never have created its own display list or have an obsolete 2946 // display list. By invalidating the child we ensure the display 2947 // list is in sync with the content of the hardware layer. 2948 for (int i = 0; i < mChildrenCount; i++) { 2949 View child = mChildren[i]; 2950 if (child.mLayerType != LAYER_TYPE_NONE) { 2951 if (flushLayers) child.flushLayer(); 2952 child.invalidate(true); 2953 } 2954 } 2955 } 2956 } 2957 2958 /** 2959 * By default, children are clipped to their bounds before drawing. This 2960 * allows view groups to override this behavior for animations, etc. 2961 * 2962 * @param clipChildren true to clip children to their bounds, 2963 * false otherwise 2964 * @attr ref android.R.styleable#ViewGroup_clipChildren 2965 */ 2966 public void setClipChildren(boolean clipChildren) { 2967 boolean previousValue = (mGroupFlags & FLAG_CLIP_CHILDREN) == FLAG_CLIP_CHILDREN; 2968 if (clipChildren != previousValue) { 2969 setBooleanFlag(FLAG_CLIP_CHILDREN, clipChildren); 2970 for (int i = 0; i < mChildrenCount; ++i) { 2971 View child = getChildAt(i); 2972 if (child.mDisplayList != null) { 2973 child.mDisplayList.setClipChildren(clipChildren); 2974 } 2975 } 2976 } 2977 } 2978 2979 /** 2980 * By default, children are clipped to the padding of the ViewGroup. This 2981 * allows view groups to override this behavior 2982 * 2983 * @param clipToPadding true to clip children to the padding of the 2984 * group, false otherwise 2985 * @attr ref android.R.styleable#ViewGroup_clipToPadding 2986 */ 2987 public void setClipToPadding(boolean clipToPadding) { 2988 setBooleanFlag(FLAG_CLIP_TO_PADDING, clipToPadding); 2989 } 2990 2991 /** 2992 * {@inheritDoc} 2993 */ 2994 @Override 2995 public void dispatchSetSelected(boolean selected) { 2996 final View[] children = mChildren; 2997 final int count = mChildrenCount; 2998 for (int i = 0; i < count; i++) { 2999 children[i].setSelected(selected); 3000 } 3001 } 3002 3003 /** 3004 * {@inheritDoc} 3005 */ 3006 @Override 3007 public void dispatchSetActivated(boolean activated) { 3008 final View[] children = mChildren; 3009 final int count = mChildrenCount; 3010 for (int i = 0; i < count; i++) { 3011 children[i].setActivated(activated); 3012 } 3013 } 3014 3015 @Override 3016 protected void dispatchSetPressed(boolean pressed) { 3017 final View[] children = mChildren; 3018 final int count = mChildrenCount; 3019 for (int i = 0; i < count; i++) { 3020 final View child = children[i]; 3021 // Children that are clickable on their own should not 3022 // show a pressed state when their parent view does. 3023 // Clearing a pressed state always propagates. 3024 if (!pressed || (!child.isClickable() && !child.isLongClickable())) { 3025 child.setPressed(pressed); 3026 } 3027 } 3028 } 3029 3030 /** 3031 * When this property is set to true, this ViewGroup supports static transformations on 3032 * children; this causes 3033 * {@link #getChildStaticTransformation(View, android.view.animation.Transformation)} to be 3034 * invoked when a child is drawn. 3035 * 3036 * Any subclass overriding 3037 * {@link #getChildStaticTransformation(View, android.view.animation.Transformation)} should 3038 * set this property to true. 3039 * 3040 * @param enabled True to enable static transformations on children, false otherwise. 3041 * 3042 * @see #FLAG_SUPPORT_STATIC_TRANSFORMATIONS 3043 */ 3044 protected void setStaticTransformationsEnabled(boolean enabled) { 3045 setBooleanFlag(FLAG_SUPPORT_STATIC_TRANSFORMATIONS, enabled); 3046 } 3047 3048 /** 3049 * Sets <code>t</code> to be the static transformation of the child, if set, returning a 3050 * boolean to indicate whether a static transform was set. The default implementation 3051 * simply returns <code>false</code>; subclasses may override this method for different 3052 * behavior. 3053 * 3054 * @param child The child view whose static transform is being requested 3055 * @param t The Transformation which will hold the result 3056 * @return true if the transformation was set, false otherwise 3057 * @see #setStaticTransformationsEnabled(boolean) 3058 */ 3059 protected boolean getChildStaticTransformation(View child, Transformation t) { 3060 return false; 3061 } 3062 3063 /** 3064 * {@hide} 3065 */ 3066 @Override 3067 protected View findViewTraversal(int id) { 3068 if (id == mID) { 3069 return this; 3070 } 3071 3072 final View[] where = mChildren; 3073 final int len = mChildrenCount; 3074 3075 for (int i = 0; i < len; i++) { 3076 View v = where[i]; 3077 3078 if ((v.mPrivateFlags & IS_ROOT_NAMESPACE) == 0) { 3079 v = v.findViewById(id); 3080 3081 if (v != null) { 3082 return v; 3083 } 3084 } 3085 } 3086 3087 return null; 3088 } 3089 3090 /** 3091 * {@hide} 3092 */ 3093 @Override 3094 protected View findViewWithTagTraversal(Object tag) { 3095 if (tag != null && tag.equals(mTag)) { 3096 return this; 3097 } 3098 3099 final View[] where = mChildren; 3100 final int len = mChildrenCount; 3101 3102 for (int i = 0; i < len; i++) { 3103 View v = where[i]; 3104 3105 if ((v.mPrivateFlags & IS_ROOT_NAMESPACE) == 0) { 3106 v = v.findViewWithTag(tag); 3107 3108 if (v != null) { 3109 return v; 3110 } 3111 } 3112 } 3113 3114 return null; 3115 } 3116 3117 /** 3118 * {@hide} 3119 */ 3120 @Override 3121 protected View findViewByPredicateTraversal(Predicate<View> predicate, View childToSkip) { 3122 if (predicate.apply(this)) { 3123 return this; 3124 } 3125 3126 final View[] where = mChildren; 3127 final int len = mChildrenCount; 3128 3129 for (int i = 0; i < len; i++) { 3130 View v = where[i]; 3131 3132 if (v != childToSkip && (v.mPrivateFlags & IS_ROOT_NAMESPACE) == 0) { 3133 v = v.findViewByPredicate(predicate); 3134 3135 if (v != null) { 3136 return v; 3137 } 3138 } 3139 } 3140 3141 return null; 3142 } 3143 3144 /** 3145 * Adds a child view. If no layout parameters are already set on the child, the 3146 * default parameters for this ViewGroup are set on the child. 3147 * 3148 * @param child the child view to add 3149 * 3150 * @see #generateDefaultLayoutParams() 3151 */ 3152 public void addView(View child) { 3153 addView(child, -1); 3154 } 3155 3156 /** 3157 * Adds a child view. If no layout parameters are already set on the child, the 3158 * default parameters for this ViewGroup are set on the child. 3159 * 3160 * @param child the child view to add 3161 * @param index the position at which to add the child 3162 * 3163 * @see #generateDefaultLayoutParams() 3164 */ 3165 public void addView(View child, int index) { 3166 LayoutParams params = child.getLayoutParams(); 3167 if (params == null) { 3168 params = generateDefaultLayoutParams(); 3169 if (params == null) { 3170 throw new IllegalArgumentException("generateDefaultLayoutParams() cannot return null"); 3171 } 3172 } 3173 addView(child, index, params); 3174 } 3175 3176 /** 3177 * Adds a child view with this ViewGroup's default layout parameters and the 3178 * specified width and height. 3179 * 3180 * @param child the child view to add 3181 */ 3182 public void addView(View child, int width, int height) { 3183 final LayoutParams params = generateDefaultLayoutParams(); 3184 params.width = width; 3185 params.height = height; 3186 addView(child, -1, params); 3187 } 3188 3189 /** 3190 * Adds a child view with the specified layout parameters. 3191 * 3192 * @param child the child view to add 3193 * @param params the layout parameters to set on the child 3194 */ 3195 public void addView(View child, LayoutParams params) { 3196 addView(child, -1, params); 3197 } 3198 3199 /** 3200 * Adds a child view with the specified layout parameters. 3201 * 3202 * @param child the child view to add 3203 * @param index the position at which to add the child 3204 * @param params the layout parameters to set on the child 3205 */ 3206 public void addView(View child, int index, LayoutParams params) { 3207 if (DBG) { 3208 System.out.println(this + " addView"); 3209 } 3210 3211 // addViewInner() will call child.requestLayout() when setting the new LayoutParams 3212 // therefore, we call requestLayout() on ourselves before, so that the child's request 3213 // will be blocked at our level 3214 requestLayout(); 3215 invalidate(true); 3216 addViewInner(child, index, params, false); 3217 } 3218 3219 /** 3220 * {@inheritDoc} 3221 */ 3222 public void updateViewLayout(View view, ViewGroup.LayoutParams params) { 3223 if (!checkLayoutParams(params)) { 3224 throw new IllegalArgumentException("Invalid LayoutParams supplied to " + this); 3225 } 3226 if (view.mParent != this) { 3227 throw new IllegalArgumentException("Given view not a child of " + this); 3228 } 3229 view.setLayoutParams(params); 3230 } 3231 3232 /** 3233 * {@inheritDoc} 3234 */ 3235 protected boolean checkLayoutParams(ViewGroup.LayoutParams p) { 3236 return p != null; 3237 } 3238 3239 /** 3240 * Interface definition for a callback to be invoked when the hierarchy 3241 * within this view changed. The hierarchy changes whenever a child is added 3242 * to or removed from this view. 3243 */ 3244 public interface OnHierarchyChangeListener { 3245 /** 3246 * Called when a new child is added to a parent view. 3247 * 3248 * @param parent the view in which a child was added 3249 * @param child the new child view added in the hierarchy 3250 */ 3251 void onChildViewAdded(View parent, View child); 3252 3253 /** 3254 * Called when a child is removed from a parent view. 3255 * 3256 * @param parent the view from which the child was removed 3257 * @param child the child removed from the hierarchy 3258 */ 3259 void onChildViewRemoved(View parent, View child); 3260 } 3261 3262 /** 3263 * Register a callback to be invoked when a child is added to or removed 3264 * from this view. 3265 * 3266 * @param listener the callback to invoke on hierarchy change 3267 */ 3268 public void setOnHierarchyChangeListener(OnHierarchyChangeListener listener) { 3269 mOnHierarchyChangeListener = listener; 3270 } 3271 3272 /** 3273 * @hide 3274 */ 3275 protected void onViewAdded(View child) { 3276 if (mOnHierarchyChangeListener != null) { 3277 mOnHierarchyChangeListener.onChildViewAdded(this, child); 3278 } 3279 } 3280 3281 /** 3282 * @hide 3283 */ 3284 protected void onViewRemoved(View child) { 3285 if (mOnHierarchyChangeListener != null) { 3286 mOnHierarchyChangeListener.onChildViewRemoved(this, child); 3287 } 3288 } 3289 3290 /** 3291 * Adds a view during layout. This is useful if in your onLayout() method, 3292 * you need to add more views (as does the list view for example). 3293 * 3294 * If index is negative, it means put it at the end of the list. 3295 * 3296 * @param child the view to add to the group 3297 * @param index the index at which the child must be added 3298 * @param params the layout parameters to associate with the child 3299 * @return true if the child was added, false otherwise 3300 */ 3301 protected boolean addViewInLayout(View child, int index, LayoutParams params) { 3302 return addViewInLayout(child, index, params, false); 3303 } 3304 3305 /** 3306 * Adds a view during layout. This is useful if in your onLayout() method, 3307 * you need to add more views (as does the list view for example). 3308 * 3309 * If index is negative, it means put it at the end of the list. 3310 * 3311 * @param child the view to add to the group 3312 * @param index the index at which the child must be added 3313 * @param params the layout parameters to associate with the child 3314 * @param preventRequestLayout if true, calling this method will not trigger a 3315 * layout request on child 3316 * @return true if the child was added, false otherwise 3317 */ 3318 protected boolean addViewInLayout(View child, int index, LayoutParams params, 3319 boolean preventRequestLayout) { 3320 child.mParent = null; 3321 addViewInner(child, index, params, preventRequestLayout); 3322 child.mPrivateFlags = (child.mPrivateFlags & ~DIRTY_MASK) | DRAWN; 3323 return true; 3324 } 3325 3326 /** 3327 * Prevents the specified child to be laid out during the next layout pass. 3328 * 3329 * @param child the child on which to perform the cleanup 3330 */ 3331 protected void cleanupLayoutState(View child) { 3332 child.mPrivateFlags &= ~View.FORCE_LAYOUT; 3333 } 3334 3335 private void addViewInner(View child, int index, LayoutParams params, 3336 boolean preventRequestLayout) { 3337 3338 if (mTransition != null) { 3339 // Don't prevent other add transitions from completing, but cancel remove 3340 // transitions to let them complete the process before we add to the container 3341 mTransition.cancel(LayoutTransition.DISAPPEARING); 3342 } 3343 3344 if (child.getParent() != null) { 3345 throw new IllegalStateException("The specified child already has a parent. " + 3346 "You must call removeView() on the child's parent first."); 3347 } 3348 3349 if (mTransition != null) { 3350 mTransition.addChild(this, child); 3351 } 3352 3353 if (!checkLayoutParams(params)) { 3354 params = generateLayoutParams(params); 3355 } 3356 3357 if (preventRequestLayout) { 3358 child.mLayoutParams = params; 3359 } else { 3360 child.setLayoutParams(params); 3361 } 3362 3363 if (index < 0) { 3364 index = mChildrenCount; 3365 } 3366 3367 addInArray(child, index); 3368 3369 // tell our children 3370 if (preventRequestLayout) { 3371 child.assignParent(this); 3372 } else { 3373 child.mParent = this; 3374 } 3375 3376 if (child.hasFocus()) { 3377 requestChildFocus(child, child.findFocus()); 3378 } 3379 3380 AttachInfo ai = mAttachInfo; 3381 if (ai != null && (mGroupFlags & FLAG_PREVENT_DISPATCH_ATTACHED_TO_WINDOW) == 0) { 3382 boolean lastKeepOn = ai.mKeepScreenOn; 3383 ai.mKeepScreenOn = false; 3384 child.dispatchAttachedToWindow(mAttachInfo, (mViewFlags&VISIBILITY_MASK)); 3385 if (ai.mKeepScreenOn) { 3386 needGlobalAttributesUpdate(true); 3387 } 3388 ai.mKeepScreenOn = lastKeepOn; 3389 } 3390 3391 onViewAdded(child); 3392 3393 if ((child.mViewFlags & DUPLICATE_PARENT_STATE) == DUPLICATE_PARENT_STATE) { 3394 mGroupFlags |= FLAG_NOTIFY_CHILDREN_ON_DRAWABLE_STATE_CHANGE; 3395 } 3396 3397 if (child.hasTransientState()) { 3398 childHasTransientStateChanged(child, true); 3399 } 3400 } 3401 3402 private void addInArray(View child, int index) { 3403 View[] children = mChildren; 3404 final int count = mChildrenCount; 3405 final int size = children.length; 3406 if (index == count) { 3407 if (size == count) { 3408 mChildren = new View[size + ARRAY_CAPACITY_INCREMENT]; 3409 System.arraycopy(children, 0, mChildren, 0, size); 3410 children = mChildren; 3411 } 3412 children[mChildrenCount++] = child; 3413 } else if (index < count) { 3414 if (size == count) { 3415 mChildren = new View[size + ARRAY_CAPACITY_INCREMENT]; 3416 System.arraycopy(children, 0, mChildren, 0, index); 3417 System.arraycopy(children, index, mChildren, index + 1, count - index); 3418 children = mChildren; 3419 } else { 3420 System.arraycopy(children, index, children, index + 1, count - index); 3421 } 3422 children[index] = child; 3423 mChildrenCount++; 3424 if (mLastTouchDownIndex >= index) { 3425 mLastTouchDownIndex++; 3426 } 3427 } else { 3428 throw new IndexOutOfBoundsException("index=" + index + " count=" + count); 3429 } 3430 } 3431 3432 // This method also sets the child's mParent to null 3433 private void removeFromArray(int index) { 3434 final View[] children = mChildren; 3435 if (!(mTransitioningViews != null && mTransitioningViews.contains(children[index]))) { 3436 children[index].mParent = null; 3437 } 3438 final int count = mChildrenCount; 3439 if (index == count - 1) { 3440 children[--mChildrenCount] = null; 3441 } else if (index >= 0 && index < count) { 3442 System.arraycopy(children, index + 1, children, index, count - index - 1); 3443 children[--mChildrenCount] = null; 3444 } else { 3445 throw new IndexOutOfBoundsException(); 3446 } 3447 if (mLastTouchDownIndex == index) { 3448 mLastTouchDownTime = 0; 3449 mLastTouchDownIndex = -1; 3450 } else if (mLastTouchDownIndex > index) { 3451 mLastTouchDownIndex--; 3452 } 3453 } 3454 3455 // This method also sets the children's mParent to null 3456 private void removeFromArray(int start, int count) { 3457 final View[] children = mChildren; 3458 final int childrenCount = mChildrenCount; 3459 3460 start = Math.max(0, start); 3461 final int end = Math.min(childrenCount, start + count); 3462 3463 if (start == end) { 3464 return; 3465 } 3466 3467 if (end == childrenCount) { 3468 for (int i = start; i < end; i++) { 3469 children[i].mParent = null; 3470 children[i] = null; 3471 } 3472 } else { 3473 for (int i = start; i < end; i++) { 3474 children[i].mParent = null; 3475 } 3476 3477 // Since we're looping above, we might as well do the copy, but is arraycopy() 3478 // faster than the extra 2 bounds checks we would do in the loop? 3479 System.arraycopy(children, end, children, start, childrenCount - end); 3480 3481 for (int i = childrenCount - (end - start); i < childrenCount; i++) { 3482 children[i] = null; 3483 } 3484 } 3485 3486 mChildrenCount -= (end - start); 3487 } 3488 3489 private void bindLayoutAnimation(View child) { 3490 Animation a = mLayoutAnimationController.getAnimationForView(child); 3491 child.setAnimation(a); 3492 } 3493 3494 /** 3495 * Subclasses should override this method to set layout animation 3496 * parameters on the supplied child. 3497 * 3498 * @param child the child to associate with animation parameters 3499 * @param params the child's layout parameters which hold the animation 3500 * parameters 3501 * @param index the index of the child in the view group 3502 * @param count the number of children in the view group 3503 */ 3504 protected void attachLayoutAnimationParameters(View child, 3505 LayoutParams params, int index, int count) { 3506 LayoutAnimationController.AnimationParameters animationParams = 3507 params.layoutAnimationParameters; 3508 if (animationParams == null) { 3509 animationParams = new LayoutAnimationController.AnimationParameters(); 3510 params.layoutAnimationParameters = animationParams; 3511 } 3512 3513 animationParams.count = count; 3514 animationParams.index = index; 3515 } 3516 3517 /** 3518 * {@inheritDoc} 3519 */ 3520 public void removeView(View view) { 3521 removeViewInternal(view); 3522 requestLayout(); 3523 invalidate(true); 3524 } 3525 3526 /** 3527 * Removes a view during layout. This is useful if in your onLayout() method, 3528 * you need to remove more views. 3529 * 3530 * @param view the view to remove from the group 3531 */ 3532 public void removeViewInLayout(View view) { 3533 removeViewInternal(view); 3534 } 3535 3536 /** 3537 * Removes a range of views during layout. This is useful if in your onLayout() method, 3538 * you need to remove more views. 3539 * 3540 * @param start the index of the first view to remove from the group 3541 * @param count the number of views to remove from the group 3542 */ 3543 public void removeViewsInLayout(int start, int count) { 3544 removeViewsInternal(start, count); 3545 } 3546 3547 /** 3548 * Removes the view at the specified position in the group. 3549 * 3550 * @param index the position in the group of the view to remove 3551 */ 3552 public void removeViewAt(int index) { 3553 removeViewInternal(index, getChildAt(index)); 3554 requestLayout(); 3555 invalidate(true); 3556 } 3557 3558 /** 3559 * Removes the specified range of views from the group. 3560 * 3561 * @param start the first position in the group of the range of views to remove 3562 * @param count the number of views to remove 3563 */ 3564 public void removeViews(int start, int count) { 3565 removeViewsInternal(start, count); 3566 requestLayout(); 3567 invalidate(true); 3568 } 3569 3570 private void removeViewInternal(View view) { 3571 final int index = indexOfChild(view); 3572 if (index >= 0) { 3573 removeViewInternal(index, view); 3574 } 3575 } 3576 3577 private void removeViewInternal(int index, View view) { 3578 3579 if (mTransition != null) { 3580 mTransition.removeChild(this, view); 3581 } 3582 3583 boolean clearChildFocus = false; 3584 if (view == mFocused) { 3585 view.unFocus(); 3586 clearChildFocus = true; 3587 } 3588 3589 cancelTouchTarget(view); 3590 cancelHoverTarget(view); 3591 3592 if (view.getAnimation() != null || 3593 (mTransitioningViews != null && mTransitioningViews.contains(view))) { 3594 addDisappearingView(view); 3595 } else if (view.mAttachInfo != null) { 3596 view.dispatchDetachedFromWindow(); 3597 } 3598 3599 if (view.hasTransientState()) { 3600 childHasTransientStateChanged(view, false); 3601 } 3602 3603 onViewRemoved(view); 3604 3605 needGlobalAttributesUpdate(false); 3606 3607 removeFromArray(index); 3608 3609 if (clearChildFocus) { 3610 clearChildFocus(view); 3611 ensureInputFocusOnFirstFocusable(); 3612 } 3613 3614 if (view.isAccessibilityFocused()) { 3615 view.clearAccessibilityFocus(); 3616 } 3617 } 3618 3619 /** 3620 * Sets the LayoutTransition object for this ViewGroup. If the LayoutTransition object is 3621 * not null, changes in layout which occur because of children being added to or removed from 3622 * the ViewGroup will be animated according to the animations defined in that LayoutTransition 3623 * object. By default, the transition object is null (so layout changes are not animated). 3624 * 3625 * @param transition The LayoutTransition object that will animated changes in layout. A value 3626 * of <code>null</code> means no transition will run on layout changes. 3627 * @attr ref android.R.styleable#ViewGroup_animateLayoutChanges 3628 */ 3629 public void setLayoutTransition(LayoutTransition transition) { 3630 if (mTransition != null) { 3631 mTransition.removeTransitionListener(mLayoutTransitionListener); 3632 } 3633 mTransition = transition; 3634 if (mTransition != null) { 3635 mTransition.addTransitionListener(mLayoutTransitionListener); 3636 } 3637 } 3638 3639 /** 3640 * Gets the LayoutTransition object for this ViewGroup. If the LayoutTransition object is 3641 * not null, changes in layout which occur because of children being added to or removed from 3642 * the ViewGroup will be animated according to the animations defined in that LayoutTransition 3643 * object. By default, the transition object is null (so layout changes are not animated). 3644 * 3645 * @return LayoutTranstion The LayoutTransition object that will animated changes in layout. 3646 * A value of <code>null</code> means no transition will run on layout changes. 3647 */ 3648 public LayoutTransition getLayoutTransition() { 3649 return mTransition; 3650 } 3651 3652 private void removeViewsInternal(int start, int count) { 3653 final View focused = mFocused; 3654 final boolean detach = mAttachInfo != null; 3655 View clearChildFocus = null; 3656 3657 final View[] children = mChildren; 3658 final int end = start + count; 3659 3660 for (int i = start; i < end; i++) { 3661 final View view = children[i]; 3662 3663 if (mTransition != null) { 3664 mTransition.removeChild(this, view); 3665 } 3666 3667 if (view == focused) { 3668 view.unFocus(); 3669 clearChildFocus = view; 3670 } 3671 3672 cancelTouchTarget(view); 3673 cancelHoverTarget(view); 3674 3675 if (view.getAnimation() != null || 3676 (mTransitioningViews != null && mTransitioningViews.contains(view))) { 3677 addDisappearingView(view); 3678 } else if (detach) { 3679 view.dispatchDetachedFromWindow(); 3680 } 3681 3682 if (view.hasTransientState()) { 3683 childHasTransientStateChanged(view, false); 3684 } 3685 3686 needGlobalAttributesUpdate(false); 3687 3688 onViewRemoved(view); 3689 } 3690 3691 removeFromArray(start, count); 3692 3693 if (clearChildFocus != null) { 3694 clearChildFocus(clearChildFocus); 3695 ensureInputFocusOnFirstFocusable(); 3696 } 3697 } 3698 3699 /** 3700 * Call this method to remove all child views from the 3701 * ViewGroup. 3702 */ 3703 public void removeAllViews() { 3704 removeAllViewsInLayout(); 3705 requestLayout(); 3706 invalidate(true); 3707 } 3708 3709 /** 3710 * Called by a ViewGroup subclass to remove child views from itself, 3711 * when it must first know its size on screen before it can calculate how many 3712 * child views it will render. An example is a Gallery or a ListView, which 3713 * may "have" 50 children, but actually only render the number of children 3714 * that can currently fit inside the object on screen. Do not call 3715 * this method unless you are extending ViewGroup and understand the 3716 * view measuring and layout pipeline. 3717 */ 3718 public void removeAllViewsInLayout() { 3719 final int count = mChildrenCount; 3720 if (count <= 0) { 3721 return; 3722 } 3723 3724 final View[] children = mChildren; 3725 mChildrenCount = 0; 3726 3727 final View focused = mFocused; 3728 final boolean detach = mAttachInfo != null; 3729 View clearChildFocus = null; 3730 3731 needGlobalAttributesUpdate(false); 3732 3733 for (int i = count - 1; i >= 0; i--) { 3734 final View view = children[i]; 3735 3736 if (mTransition != null) { 3737 mTransition.removeChild(this, view); 3738 } 3739 3740 if (view == focused) { 3741 view.unFocus(); 3742 clearChildFocus = view; 3743 } 3744 3745 cancelTouchTarget(view); 3746 cancelHoverTarget(view); 3747 3748 if (view.getAnimation() != null || 3749 (mTransitioningViews != null && mTransitioningViews.contains(view))) { 3750 addDisappearingView(view); 3751 } else if (detach) { 3752 view.dispatchDetachedFromWindow(); 3753 } 3754 3755 if (view.hasTransientState()) { 3756 childHasTransientStateChanged(view, false); 3757 } 3758 3759 onViewRemoved(view); 3760 3761 view.mParent = null; 3762 children[i] = null; 3763 } 3764 3765 if (clearChildFocus != null) { 3766 clearChildFocus(clearChildFocus); 3767 ensureInputFocusOnFirstFocusable(); 3768 } 3769 } 3770 3771 /** 3772 * Finishes the removal of a detached view. This method will dispatch the detached from 3773 * window event and notify the hierarchy change listener. 3774 * 3775 * @param child the child to be definitely removed from the view hierarchy 3776 * @param animate if true and the view has an animation, the view is placed in the 3777 * disappearing views list, otherwise, it is detached from the window 3778 * 3779 * @see #attachViewToParent(View, int, android.view.ViewGroup.LayoutParams) 3780 * @see #detachAllViewsFromParent() 3781 * @see #detachViewFromParent(View) 3782 * @see #detachViewFromParent(int) 3783 */ 3784 protected void removeDetachedView(View child, boolean animate) { 3785 if (mTransition != null) { 3786 mTransition.removeChild(this, child); 3787 } 3788 3789 if (child == mFocused) { 3790 child.clearFocus(); 3791 } 3792 3793 cancelTouchTarget(child); 3794 cancelHoverTarget(child); 3795 3796 if ((animate && child.getAnimation() != null) || 3797 (mTransitioningViews != null && mTransitioningViews.contains(child))) { 3798 addDisappearingView(child); 3799 } else if (child.mAttachInfo != null) { 3800 child.dispatchDetachedFromWindow(); 3801 } 3802 3803 if (child.hasTransientState()) { 3804 childHasTransientStateChanged(child, false); 3805 } 3806 3807 onViewRemoved(child); 3808 } 3809 3810 /** 3811 * Attaches a view to this view group. Attaching a view assigns this group as the parent, 3812 * sets the layout parameters and puts the view in the list of children so it can be retrieved 3813 * by calling {@link #getChildAt(int)}. 3814 * 3815 * This method should be called only for view which were detached from their parent. 3816 * 3817 * @param child the child to attach 3818 * @param index the index at which the child should be attached 3819 * @param params the layout parameters of the child 3820 * 3821 * @see #removeDetachedView(View, boolean) 3822 * @see #detachAllViewsFromParent() 3823 * @see #detachViewFromParent(View) 3824 * @see #detachViewFromParent(int) 3825 */ 3826 protected void attachViewToParent(View child, int index, LayoutParams params) { 3827 child.mLayoutParams = params; 3828 3829 if (index < 0) { 3830 index = mChildrenCount; 3831 } 3832 3833 addInArray(child, index); 3834 3835 child.mParent = this; 3836 child.mPrivateFlags = (child.mPrivateFlags & ~DIRTY_MASK & ~DRAWING_CACHE_VALID) | 3837 DRAWN | INVALIDATED; 3838 this.mPrivateFlags |= INVALIDATED; 3839 3840 if (child.hasFocus()) { 3841 requestChildFocus(child, child.findFocus()); 3842 } 3843 } 3844 3845 /** 3846 * Detaches a view from its parent. Detaching a view should be temporary and followed 3847 * either by a call to {@link #attachViewToParent(View, int, android.view.ViewGroup.LayoutParams)} 3848 * or a call to {@link #removeDetachedView(View, boolean)}. When a view is detached, 3849 * its parent is null and cannot be retrieved by a call to {@link #getChildAt(int)}. 3850 * 3851 * @param child the child to detach 3852 * 3853 * @see #detachViewFromParent(int) 3854 * @see #detachViewsFromParent(int, int) 3855 * @see #detachAllViewsFromParent() 3856 * @see #attachViewToParent(View, int, android.view.ViewGroup.LayoutParams) 3857 * @see #removeDetachedView(View, boolean) 3858 */ 3859 protected void detachViewFromParent(View child) { 3860 removeFromArray(indexOfChild(child)); 3861 } 3862 3863 /** 3864 * Detaches a view from its parent. Detaching a view should be temporary and followed 3865 * either by a call to {@link #attachViewToParent(View, int, android.view.ViewGroup.LayoutParams)} 3866 * or a call to {@link #removeDetachedView(View, boolean)}. When a view is detached, 3867 * its parent is null and cannot be retrieved by a call to {@link #getChildAt(int)}. 3868 * 3869 * @param index the index of the child to detach 3870 * 3871 * @see #detachViewFromParent(View) 3872 * @see #detachAllViewsFromParent() 3873 * @see #detachViewsFromParent(int, int) 3874 * @see #attachViewToParent(View, int, android.view.ViewGroup.LayoutParams) 3875 * @see #removeDetachedView(View, boolean) 3876 */ 3877 protected void detachViewFromParent(int index) { 3878 removeFromArray(index); 3879 } 3880 3881 /** 3882 * Detaches a range of view from their parent. Detaching a view should be temporary and followed 3883 * either by a call to {@link #attachViewToParent(View, int, android.view.ViewGroup.LayoutParams)} 3884 * or a call to {@link #removeDetachedView(View, boolean)}. When a view is detached, its 3885 * parent is null and cannot be retrieved by a call to {@link #getChildAt(int)}. 3886 * 3887 * @param start the first index of the childrend range to detach 3888 * @param count the number of children to detach 3889 * 3890 * @see #detachViewFromParent(View) 3891 * @see #detachViewFromParent(int) 3892 * @see #detachAllViewsFromParent() 3893 * @see #attachViewToParent(View, int, android.view.ViewGroup.LayoutParams) 3894 * @see #removeDetachedView(View, boolean) 3895 */ 3896 protected void detachViewsFromParent(int start, int count) { 3897 removeFromArray(start, count); 3898 } 3899 3900 /** 3901 * Detaches all views from the parent. Detaching a view should be temporary and followed 3902 * either by a call to {@link #attachViewToParent(View, int, android.view.ViewGroup.LayoutParams)} 3903 * or a call to {@link #removeDetachedView(View, boolean)}. When a view is detached, 3904 * its parent is null and cannot be retrieved by a call to {@link #getChildAt(int)}. 3905 * 3906 * @see #detachViewFromParent(View) 3907 * @see #detachViewFromParent(int) 3908 * @see #detachViewsFromParent(int, int) 3909 * @see #attachViewToParent(View, int, android.view.ViewGroup.LayoutParams) 3910 * @see #removeDetachedView(View, boolean) 3911 */ 3912 protected void detachAllViewsFromParent() { 3913 final int count = mChildrenCount; 3914 if (count <= 0) { 3915 return; 3916 } 3917 3918 final View[] children = mChildren; 3919 mChildrenCount = 0; 3920 3921 for (int i = count - 1; i >= 0; i--) { 3922 children[i].mParent = null; 3923 children[i] = null; 3924 } 3925 } 3926 3927 /** 3928 * Don't call or override this method. It is used for the implementation of 3929 * the view hierarchy. 3930 */ 3931 public final void invalidateChild(View child, final Rect dirty) { 3932 if (ViewDebug.TRACE_HIERARCHY) { 3933 ViewDebug.trace(this, ViewDebug.HierarchyTraceType.INVALIDATE_CHILD); 3934 } 3935 3936 ViewParent parent = this; 3937 3938 final AttachInfo attachInfo = mAttachInfo; 3939 if (attachInfo != null) { 3940 // If the child is drawing an animation, we want to copy this flag onto 3941 // ourselves and the parent to make sure the invalidate request goes 3942 // through 3943 final boolean drawAnimation = (child.mPrivateFlags & DRAW_ANIMATION) == DRAW_ANIMATION; 3944 3945 // Check whether the child that requests the invalidate is fully opaque 3946 // Views being animated or transformed are not considered opaque because we may 3947 // be invalidating their old position and need the parent to paint behind them. 3948 Matrix childMatrix = child.getMatrix(); 3949 final boolean isOpaque = child.isOpaque() && !drawAnimation && 3950 child.getAnimation() == null && childMatrix.isIdentity(); 3951 // Mark the child as dirty, using the appropriate flag 3952 // Make sure we do not set both flags at the same time 3953 int opaqueFlag = isOpaque ? DIRTY_OPAQUE : DIRTY; 3954 3955 if (child.mLayerType != LAYER_TYPE_NONE) { 3956 mPrivateFlags |= INVALIDATED; 3957 mPrivateFlags &= ~DRAWING_CACHE_VALID; 3958 child.mLocalDirtyRect.union(dirty); 3959 } 3960 3961 final int[] location = attachInfo.mInvalidateChildLocation; 3962 location[CHILD_LEFT_INDEX] = child.mLeft; 3963 location[CHILD_TOP_INDEX] = child.mTop; 3964 if (!childMatrix.isIdentity()) { 3965 RectF boundingRect = attachInfo.mTmpTransformRect; 3966 boundingRect.set(dirty); 3967 //boundingRect.inset(-0.5f, -0.5f); 3968 childMatrix.mapRect(boundingRect); 3969 dirty.set((int) (boundingRect.left - 0.5f), 3970 (int) (boundingRect.top - 0.5f), 3971 (int) (boundingRect.right + 0.5f), 3972 (int) (boundingRect.bottom + 0.5f)); 3973 } 3974 3975 do { 3976 View view = null; 3977 if (parent instanceof View) { 3978 view = (View) parent; 3979 } 3980 3981 if (drawAnimation) { 3982 if (view != null) { 3983 view.mPrivateFlags |= DRAW_ANIMATION; 3984 } else if (parent instanceof ViewRootImpl) { 3985 ((ViewRootImpl) parent).mIsAnimating = true; 3986 } 3987 } 3988 3989 // If the parent is dirty opaque or not dirty, mark it dirty with the opaque 3990 // flag coming from the child that initiated the invalidate 3991 if (view != null) { 3992 if ((view.mViewFlags & FADING_EDGE_MASK) != 0 && 3993 view.getSolidColor() == 0) { 3994 opaqueFlag = DIRTY; 3995 } 3996 if ((view.mPrivateFlags & DIRTY_MASK) != DIRTY) { 3997 view.mPrivateFlags = (view.mPrivateFlags & ~DIRTY_MASK) | opaqueFlag; 3998 } 3999 } 4000 4001 parent = parent.invalidateChildInParent(location, dirty); 4002 if (view != null) { 4003 // Account for transform on current parent 4004 Matrix m = view.getMatrix(); 4005 if (!m.isIdentity()) { 4006 RectF boundingRect = attachInfo.mTmpTransformRect; 4007 boundingRect.set(dirty); 4008 m.mapRect(boundingRect); 4009 dirty.set((int) (boundingRect.left - 0.5f), 4010 (int) (boundingRect.top - 0.5f), 4011 (int) (boundingRect.right + 0.5f), 4012 (int) (boundingRect.bottom + 0.5f)); 4013 } 4014 } 4015 } while (parent != null); 4016 } 4017 } 4018 4019 /** 4020 * Don't call or override this method. It is used for the implementation of 4021 * the view hierarchy. 4022 * 4023 * This implementation returns null if this ViewGroup does not have a parent, 4024 * if this ViewGroup is already fully invalidated or if the dirty rectangle 4025 * does not intersect with this ViewGroup's bounds. 4026 */ 4027 public ViewParent invalidateChildInParent(final int[] location, final Rect dirty) { 4028 if (ViewDebug.TRACE_HIERARCHY) { 4029 ViewDebug.trace(this, ViewDebug.HierarchyTraceType.INVALIDATE_CHILD_IN_PARENT); 4030 } 4031 4032 if ((mPrivateFlags & DRAWN) == DRAWN || 4033 (mPrivateFlags & DRAWING_CACHE_VALID) == DRAWING_CACHE_VALID) { 4034 if ((mGroupFlags & (FLAG_OPTIMIZE_INVALIDATE | FLAG_ANIMATION_DONE)) != 4035 FLAG_OPTIMIZE_INVALIDATE) { 4036 dirty.offset(location[CHILD_LEFT_INDEX] - mScrollX, 4037 location[CHILD_TOP_INDEX] - mScrollY); 4038 4039 final int left = mLeft; 4040 final int top = mTop; 4041 4042 if ((mGroupFlags & FLAG_CLIP_CHILDREN) != FLAG_CLIP_CHILDREN || 4043 dirty.intersect(0, 0, mRight - left, mBottom - top) || 4044 (mPrivateFlags & DRAW_ANIMATION) == DRAW_ANIMATION) { 4045 mPrivateFlags &= ~DRAWING_CACHE_VALID; 4046 4047 location[CHILD_LEFT_INDEX] = left; 4048 location[CHILD_TOP_INDEX] = top; 4049 4050 if (mLayerType != LAYER_TYPE_NONE) { 4051 mPrivateFlags |= INVALIDATED; 4052 mLocalDirtyRect.union(dirty); 4053 } 4054 4055 return mParent; 4056 } 4057 } else { 4058 mPrivateFlags &= ~DRAWN & ~DRAWING_CACHE_VALID; 4059 4060 location[CHILD_LEFT_INDEX] = mLeft; 4061 location[CHILD_TOP_INDEX] = mTop; 4062 if ((mGroupFlags & FLAG_CLIP_CHILDREN) == FLAG_CLIP_CHILDREN) { 4063 dirty.set(0, 0, mRight - mLeft, mBottom - mTop); 4064 } else { 4065 // in case the dirty rect extends outside the bounds of this container 4066 dirty.union(0, 0, mRight - mLeft, mBottom - mTop); 4067 } 4068 4069 if (mLayerType != LAYER_TYPE_NONE) { 4070 mPrivateFlags |= INVALIDATED; 4071 mLocalDirtyRect.union(dirty); 4072 } 4073 4074 return mParent; 4075 } 4076 } 4077 4078 return null; 4079 } 4080 4081 /** 4082 * Quick invalidation method called by View.invalidateViewProperty. This doesn't set the 4083 * DRAWN flags and doesn't handle the Animation logic that the default invalidation methods 4084 * do; all we want to do here is schedule a traversal with the appropriate dirty rect. 4085 * 4086 * @hide 4087 */ 4088 public void invalidateChildFast(View child, final Rect dirty) { 4089 ViewParent parent = this; 4090 4091 final AttachInfo attachInfo = mAttachInfo; 4092 if (attachInfo != null) { 4093 if (child.mLayerType != LAYER_TYPE_NONE) { 4094 child.mLocalDirtyRect.union(dirty); 4095 } 4096 4097 int left = child.mLeft; 4098 int top = child.mTop; 4099 if (!child.getMatrix().isIdentity()) { 4100 child.transformRect(dirty); 4101 } 4102 4103 do { 4104 if (parent instanceof ViewGroup) { 4105 ViewGroup parentVG = (ViewGroup) parent; 4106 if (parentVG.mLayerType != LAYER_TYPE_NONE) { 4107 // Layered parents should be recreated, not just re-issued 4108 parentVG.invalidate(); 4109 parent = null; 4110 } else { 4111 parent = parentVG.invalidateChildInParentFast(left, top, dirty); 4112 left = parentVG.mLeft; 4113 top = parentVG.mTop; 4114 } 4115 } else { 4116 // Reached the top; this calls into the usual invalidate method in 4117 // ViewRootImpl, which schedules a traversal 4118 final int[] location = attachInfo.mInvalidateChildLocation; 4119 location[0] = left; 4120 location[1] = top; 4121 parent = parent.invalidateChildInParent(location, dirty); 4122 } 4123 } while (parent != null); 4124 } 4125 } 4126 4127 /** 4128 * Quick invalidation method that simply transforms the dirty rect into the parent's 4129 * coordinate system, pruning the invalidation if the parent has already been invalidated. 4130 */ 4131 private ViewParent invalidateChildInParentFast(int left, int top, final Rect dirty) { 4132 if ((mPrivateFlags & DRAWN) == DRAWN || 4133 (mPrivateFlags & DRAWING_CACHE_VALID) == DRAWING_CACHE_VALID) { 4134 dirty.offset(left - mScrollX, top - mScrollY); 4135 4136 if ((mGroupFlags & FLAG_CLIP_CHILDREN) == 0 || 4137 dirty.intersect(0, 0, mRight - mLeft, mBottom - mTop)) { 4138 4139 if (mLayerType != LAYER_TYPE_NONE) { 4140 mLocalDirtyRect.union(dirty); 4141 } 4142 if (!getMatrix().isIdentity()) { 4143 transformRect(dirty); 4144 } 4145 4146 return mParent; 4147 } 4148 } 4149 4150 return null; 4151 } 4152 4153 /** 4154 * Offset a rectangle that is in a descendant's coordinate 4155 * space into our coordinate space. 4156 * @param descendant A descendant of this view 4157 * @param rect A rectangle defined in descendant's coordinate space. 4158 */ 4159 public final void offsetDescendantRectToMyCoords(View descendant, Rect rect) { 4160 offsetRectBetweenParentAndChild(descendant, rect, true, false); 4161 } 4162 4163 /** 4164 * Offset a rectangle that is in our coordinate space into an ancestor's 4165 * coordinate space. 4166 * @param descendant A descendant of this view 4167 * @param rect A rectangle defined in descendant's coordinate space. 4168 */ 4169 public final void offsetRectIntoDescendantCoords(View descendant, Rect rect) { 4170 offsetRectBetweenParentAndChild(descendant, rect, false, false); 4171 } 4172 4173 /** 4174 * Helper method that offsets a rect either from parent to descendant or 4175 * descendant to parent. 4176 */ 4177 void offsetRectBetweenParentAndChild(View descendant, Rect rect, 4178 boolean offsetFromChildToParent, boolean clipToBounds) { 4179 4180 // already in the same coord system :) 4181 if (descendant == this) { 4182 return; 4183 } 4184 4185 ViewParent theParent = descendant.mParent; 4186 4187 // search and offset up to the parent 4188 while ((theParent != null) 4189 && (theParent instanceof View) 4190 && (theParent != this)) { 4191 4192 if (offsetFromChildToParent) { 4193 rect.offset(descendant.mLeft - descendant.mScrollX, 4194 descendant.mTop - descendant.mScrollY); 4195 if (clipToBounds) { 4196 View p = (View) theParent; 4197 rect.intersect(0, 0, p.mRight - p.mLeft, p.mBottom - p.mTop); 4198 } 4199 } else { 4200 if (clipToBounds) { 4201 View p = (View) theParent; 4202 rect.intersect(0, 0, p.mRight - p.mLeft, p.mBottom - p.mTop); 4203 } 4204 rect.offset(descendant.mScrollX - descendant.mLeft, 4205 descendant.mScrollY - descendant.mTop); 4206 } 4207 4208 descendant = (View) theParent; 4209 theParent = descendant.mParent; 4210 } 4211 4212 // now that we are up to this view, need to offset one more time 4213 // to get into our coordinate space 4214 if (theParent == this) { 4215 if (offsetFromChildToParent) { 4216 rect.offset(descendant.mLeft - descendant.mScrollX, 4217 descendant.mTop - descendant.mScrollY); 4218 } else { 4219 rect.offset(descendant.mScrollX - descendant.mLeft, 4220 descendant.mScrollY - descendant.mTop); 4221 } 4222 } else { 4223 throw new IllegalArgumentException("parameter must be a descendant of this view"); 4224 } 4225 } 4226 4227 /** 4228 * Offset the vertical location of all children of this view by the specified number of pixels. 4229 * 4230 * @param offset the number of pixels to offset 4231 * 4232 * @hide 4233 */ 4234 public void offsetChildrenTopAndBottom(int offset) { 4235 final int count = mChildrenCount; 4236 final View[] children = mChildren; 4237 4238 for (int i = 0; i < count; i++) { 4239 final View v = children[i]; 4240 v.mTop += offset; 4241 v.mBottom += offset; 4242 if (v.mDisplayList != null) { 4243 v.mDisplayList.offsetTopBottom(offset); 4244 invalidateViewProperty(false, false); 4245 } 4246 } 4247 } 4248 4249 /** 4250 * {@inheritDoc} 4251 */ 4252 public boolean getChildVisibleRect(View child, Rect r, android.graphics.Point offset) { 4253 // It doesn't make a whole lot of sense to call this on a view that isn't attached, 4254 // but for some simple tests it can be useful. If we don't have attach info this 4255 // will allocate memory. 4256 final RectF rect = mAttachInfo != null ? mAttachInfo.mTmpTransformRect : new RectF(); 4257 rect.set(r); 4258 4259 if (!child.hasIdentityMatrix()) { 4260 child.getMatrix().mapRect(rect); 4261 } 4262 4263 int dx = child.mLeft - mScrollX; 4264 int dy = child.mTop - mScrollY; 4265 4266 rect.offset(dx, dy); 4267 4268 if (offset != null) { 4269 if (!child.hasIdentityMatrix()) { 4270 float[] position = mAttachInfo != null ? mAttachInfo.mTmpTransformLocation 4271 : new float[2]; 4272 position[0] = offset.x; 4273 position[1] = offset.y; 4274 child.getMatrix().mapPoints(position); 4275 offset.x = (int) (position[0] + 0.5f); 4276 offset.y = (int) (position[1] + 0.5f); 4277 } 4278 offset.x += dx; 4279 offset.y += dy; 4280 } 4281 4282 if (rect.intersect(0, 0, mRight - mLeft, mBottom - mTop)) { 4283 if (mParent == null) return true; 4284 r.set((int) (rect.left + 0.5f), (int) (rect.top + 0.5f), 4285 (int) (rect.right + 0.5f), (int) (rect.bottom + 0.5f)); 4286 return mParent.getChildVisibleRect(this, r, offset); 4287 } 4288 4289 return false; 4290 } 4291 4292 /** 4293 * {@inheritDoc} 4294 */ 4295 @Override 4296 public final void layout(int l, int t, int r, int b) { 4297 if (mTransition == null || !mTransition.isChangingLayout()) { 4298 if (mTransition != null) { 4299 mTransition.layoutChange(this); 4300 } 4301 super.layout(l, t, r, b); 4302 } else { 4303 // record the fact that we noop'd it; request layout when transition finishes 4304 mLayoutSuppressed = true; 4305 } 4306 } 4307 4308 /** 4309 * {@inheritDoc} 4310 */ 4311 @Override 4312 protected abstract void onLayout(boolean changed, 4313 int l, int t, int r, int b); 4314 4315 /** 4316 * Indicates whether the view group has the ability to animate its children 4317 * after the first layout. 4318 * 4319 * @return true if the children can be animated, false otherwise 4320 */ 4321 protected boolean canAnimate() { 4322 return mLayoutAnimationController != null; 4323 } 4324 4325 /** 4326 * Runs the layout animation. Calling this method triggers a relayout of 4327 * this view group. 4328 */ 4329 public void startLayoutAnimation() { 4330 if (mLayoutAnimationController != null) { 4331 mGroupFlags |= FLAG_RUN_ANIMATION; 4332 requestLayout(); 4333 } 4334 } 4335 4336 /** 4337 * Schedules the layout animation to be played after the next layout pass 4338 * of this view group. This can be used to restart the layout animation 4339 * when the content of the view group changes or when the activity is 4340 * paused and resumed. 4341 */ 4342 public void scheduleLayoutAnimation() { 4343 mGroupFlags |= FLAG_RUN_ANIMATION; 4344 } 4345 4346 /** 4347 * Sets the layout animation controller used to animate the group's 4348 * children after the first layout. 4349 * 4350 * @param controller the animation controller 4351 */ 4352 public void setLayoutAnimation(LayoutAnimationController controller) { 4353 mLayoutAnimationController = controller; 4354 if (mLayoutAnimationController != null) { 4355 mGroupFlags |= FLAG_RUN_ANIMATION; 4356 } 4357 } 4358 4359 /** 4360 * Returns the layout animation controller used to animate the group's 4361 * children. 4362 * 4363 * @return the current animation controller 4364 */ 4365 public LayoutAnimationController getLayoutAnimation() { 4366 return mLayoutAnimationController; 4367 } 4368 4369 /** 4370 * Indicates whether the children's drawing cache is used during a layout 4371 * animation. By default, the drawing cache is enabled but this will prevent 4372 * nested layout animations from working. To nest animations, you must disable 4373 * the cache. 4374 * 4375 * @return true if the animation cache is enabled, false otherwise 4376 * 4377 * @see #setAnimationCacheEnabled(boolean) 4378 * @see View#setDrawingCacheEnabled(boolean) 4379 */ 4380 @ViewDebug.ExportedProperty 4381 public boolean isAnimationCacheEnabled() { 4382 return (mGroupFlags & FLAG_ANIMATION_CACHE) == FLAG_ANIMATION_CACHE; 4383 } 4384 4385 /** 4386 * Enables or disables the children's drawing cache during a layout animation. 4387 * By default, the drawing cache is enabled but this will prevent nested 4388 * layout animations from working. To nest animations, you must disable the 4389 * cache. 4390 * 4391 * @param enabled true to enable the animation cache, false otherwise 4392 * 4393 * @see #isAnimationCacheEnabled() 4394 * @see View#setDrawingCacheEnabled(boolean) 4395 */ 4396 public void setAnimationCacheEnabled(boolean enabled) { 4397 setBooleanFlag(FLAG_ANIMATION_CACHE, enabled); 4398 } 4399 4400 /** 4401 * Indicates whether this ViewGroup will always try to draw its children using their 4402 * drawing cache. By default this property is enabled. 4403 * 4404 * @return true if the animation cache is enabled, false otherwise 4405 * 4406 * @see #setAlwaysDrawnWithCacheEnabled(boolean) 4407 * @see #setChildrenDrawnWithCacheEnabled(boolean) 4408 * @see View#setDrawingCacheEnabled(boolean) 4409 */ 4410 @ViewDebug.ExportedProperty(category = "drawing") 4411 public boolean isAlwaysDrawnWithCacheEnabled() { 4412 return (mGroupFlags & FLAG_ALWAYS_DRAWN_WITH_CACHE) == FLAG_ALWAYS_DRAWN_WITH_CACHE; 4413 } 4414 4415 /** 4416 * Indicates whether this ViewGroup will always try to draw its children using their 4417 * drawing cache. This property can be set to true when the cache rendering is 4418 * slightly different from the children's normal rendering. Renderings can be different, 4419 * for instance, when the cache's quality is set to low. 4420 * 4421 * When this property is disabled, the ViewGroup will use the drawing cache of its 4422 * children only when asked to. It's usually the task of subclasses to tell ViewGroup 4423 * when to start using the drawing cache and when to stop using it. 4424 * 4425 * @param always true to always draw with the drawing cache, false otherwise 4426 * 4427 * @see #isAlwaysDrawnWithCacheEnabled() 4428 * @see #setChildrenDrawnWithCacheEnabled(boolean) 4429 * @see View#setDrawingCacheEnabled(boolean) 4430 * @see View#setDrawingCacheQuality(int) 4431 */ 4432 public void setAlwaysDrawnWithCacheEnabled(boolean always) { 4433 setBooleanFlag(FLAG_ALWAYS_DRAWN_WITH_CACHE, always); 4434 } 4435 4436 /** 4437 * Indicates whether the ViewGroup is currently drawing its children using 4438 * their drawing cache. 4439 * 4440 * @return true if children should be drawn with their cache, false otherwise 4441 * 4442 * @see #setAlwaysDrawnWithCacheEnabled(boolean) 4443 * @see #setChildrenDrawnWithCacheEnabled(boolean) 4444 */ 4445 @ViewDebug.ExportedProperty(category = "drawing") 4446 protected boolean isChildrenDrawnWithCacheEnabled() { 4447 return (mGroupFlags & FLAG_CHILDREN_DRAWN_WITH_CACHE) == FLAG_CHILDREN_DRAWN_WITH_CACHE; 4448 } 4449 4450 /** 4451 * Tells the ViewGroup to draw its children using their drawing cache. This property 4452 * is ignored when {@link #isAlwaysDrawnWithCacheEnabled()} is true. A child's drawing cache 4453 * will be used only if it has been enabled. 4454 * 4455 * Subclasses should call this method to start and stop using the drawing cache when 4456 * they perform performance sensitive operations, like scrolling or animating. 4457 * 4458 * @param enabled true if children should be drawn with their cache, false otherwise 4459 * 4460 * @see #setAlwaysDrawnWithCacheEnabled(boolean) 4461 * @see #isChildrenDrawnWithCacheEnabled() 4462 */ 4463 protected void setChildrenDrawnWithCacheEnabled(boolean enabled) { 4464 setBooleanFlag(FLAG_CHILDREN_DRAWN_WITH_CACHE, enabled); 4465 } 4466 4467 /** 4468 * Indicates whether the ViewGroup is drawing its children in the order defined by 4469 * {@link #getChildDrawingOrder(int, int)}. 4470 * 4471 * @return true if children drawing order is defined by {@link #getChildDrawingOrder(int, int)}, 4472 * false otherwise 4473 * 4474 * @see #setChildrenDrawingOrderEnabled(boolean) 4475 * @see #getChildDrawingOrder(int, int) 4476 */ 4477 @ViewDebug.ExportedProperty(category = "drawing") 4478 protected boolean isChildrenDrawingOrderEnabled() { 4479 return (mGroupFlags & FLAG_USE_CHILD_DRAWING_ORDER) == FLAG_USE_CHILD_DRAWING_ORDER; 4480 } 4481 4482 /** 4483 * Tells the ViewGroup whether to draw its children in the order defined by the method 4484 * {@link #getChildDrawingOrder(int, int)}. 4485 * 4486 * @param enabled true if the order of the children when drawing is determined by 4487 * {@link #getChildDrawingOrder(int, int)}, false otherwise 4488 * 4489 * @see #isChildrenDrawingOrderEnabled() 4490 * @see #getChildDrawingOrder(int, int) 4491 */ 4492 protected void setChildrenDrawingOrderEnabled(boolean enabled) { 4493 setBooleanFlag(FLAG_USE_CHILD_DRAWING_ORDER, enabled); 4494 } 4495 4496 private void setBooleanFlag(int flag, boolean value) { 4497 if (value) { 4498 mGroupFlags |= flag; 4499 } else { 4500 mGroupFlags &= ~flag; 4501 } 4502 } 4503 4504 /** 4505 * Returns an integer indicating what types of drawing caches are kept in memory. 4506 * 4507 * @see #setPersistentDrawingCache(int) 4508 * @see #setAnimationCacheEnabled(boolean) 4509 * 4510 * @return one or a combination of {@link #PERSISTENT_NO_CACHE}, 4511 * {@link #PERSISTENT_ANIMATION_CACHE}, {@link #PERSISTENT_SCROLLING_CACHE} 4512 * and {@link #PERSISTENT_ALL_CACHES} 4513 */ 4514 @ViewDebug.ExportedProperty(category = "drawing", mapping = { 4515 @ViewDebug.IntToString(from = PERSISTENT_NO_CACHE, to = "NONE"), 4516 @ViewDebug.IntToString(from = PERSISTENT_ANIMATION_CACHE, to = "ANIMATION"), 4517 @ViewDebug.IntToString(from = PERSISTENT_SCROLLING_CACHE, to = "SCROLLING"), 4518 @ViewDebug.IntToString(from = PERSISTENT_ALL_CACHES, to = "ALL") 4519 }) 4520 public int getPersistentDrawingCache() { 4521 return mPersistentDrawingCache; 4522 } 4523 4524 /** 4525 * Indicates what types of drawing caches should be kept in memory after 4526 * they have been created. 4527 * 4528 * @see #getPersistentDrawingCache() 4529 * @see #setAnimationCacheEnabled(boolean) 4530 * 4531 * @param drawingCacheToKeep one or a combination of {@link #PERSISTENT_NO_CACHE}, 4532 * {@link #PERSISTENT_ANIMATION_CACHE}, {@link #PERSISTENT_SCROLLING_CACHE} 4533 * and {@link #PERSISTENT_ALL_CACHES} 4534 */ 4535 public void setPersistentDrawingCache(int drawingCacheToKeep) { 4536 mPersistentDrawingCache = drawingCacheToKeep & PERSISTENT_ALL_CACHES; 4537 } 4538 4539 /** 4540 * Returns the basis of alignment during layout operations on this view group: 4541 * either {@link #CLIP_BOUNDS} or {@link #OPTICAL_BOUNDS}. 4542 * 4543 * @return the layout mode to use during layout operations 4544 * 4545 * @see #setLayoutMode(int) 4546 * 4547 * @hide 4548 */ 4549 public int getLayoutMode() { 4550 return mLayoutMode; 4551 } 4552 4553 /** 4554 * Sets the basis of alignment during the layout of this view group. 4555 * Valid values are either {@link #CLIP_BOUNDS} or {@link #OPTICAL_BOUNDS}. 4556 * <p> 4557 * The default is {@link #CLIP_BOUNDS}. 4558 * 4559 * @param layoutMode the layout mode to use during layout operations 4560 * 4561 * @see #getLayoutMode() 4562 * 4563 * @hide 4564 */ 4565 public void setLayoutMode(int layoutMode) { 4566 if (mLayoutMode != layoutMode) { 4567 mLayoutMode = layoutMode; 4568 requestLayout(); 4569 } 4570 } 4571 4572 /** 4573 * Returns a new set of layout parameters based on the supplied attributes set. 4574 * 4575 * @param attrs the attributes to build the layout parameters from 4576 * 4577 * @return an instance of {@link android.view.ViewGroup.LayoutParams} or one 4578 * of its descendants 4579 */ 4580 public LayoutParams generateLayoutParams(AttributeSet attrs) { 4581 return new LayoutParams(getContext(), attrs); 4582 } 4583 4584 /** 4585 * Returns a safe set of layout parameters based on the supplied layout params. 4586 * When a ViewGroup is passed a View whose layout params do not pass the test of 4587 * {@link #checkLayoutParams(android.view.ViewGroup.LayoutParams)}, this method 4588 * is invoked. This method should return a new set of layout params suitable for 4589 * this ViewGroup, possibly by copying the appropriate attributes from the 4590 * specified set of layout params. 4591 * 4592 * @param p The layout parameters to convert into a suitable set of layout parameters 4593 * for this ViewGroup. 4594 * 4595 * @return an instance of {@link android.view.ViewGroup.LayoutParams} or one 4596 * of its descendants 4597 */ 4598 protected LayoutParams generateLayoutParams(ViewGroup.LayoutParams p) { 4599 return p; 4600 } 4601 4602 /** 4603 * Returns a set of default layout parameters. These parameters are requested 4604 * when the View passed to {@link #addView(View)} has no layout parameters 4605 * already set. If null is returned, an exception is thrown from addView. 4606 * 4607 * @return a set of default layout parameters or null 4608 */ 4609 protected LayoutParams generateDefaultLayoutParams() { 4610 return new LayoutParams(LayoutParams.WRAP_CONTENT, LayoutParams.WRAP_CONTENT); 4611 } 4612 4613 /** 4614 * @hide 4615 */ 4616 @Override 4617 protected boolean dispatchConsistencyCheck(int consistency) { 4618 boolean result = super.dispatchConsistencyCheck(consistency); 4619 4620 final int count = mChildrenCount; 4621 final View[] children = mChildren; 4622 for (int i = 0; i < count; i++) { 4623 if (!children[i].dispatchConsistencyCheck(consistency)) result = false; 4624 } 4625 4626 return result; 4627 } 4628 4629 /** 4630 * @hide 4631 */ 4632 @Override 4633 protected boolean onConsistencyCheck(int consistency) { 4634 boolean result = super.onConsistencyCheck(consistency); 4635 4636 final boolean checkLayout = (consistency & ViewDebug.CONSISTENCY_LAYOUT) != 0; 4637 final boolean checkDrawing = (consistency & ViewDebug.CONSISTENCY_DRAWING) != 0; 4638 4639 if (checkLayout) { 4640 final int count = mChildrenCount; 4641 final View[] children = mChildren; 4642 for (int i = 0; i < count; i++) { 4643 if (children[i].getParent() != this) { 4644 result = false; 4645 android.util.Log.d(ViewDebug.CONSISTENCY_LOG_TAG, 4646 "View " + children[i] + " has no parent/a parent that is not " + this); 4647 } 4648 } 4649 } 4650 4651 if (checkDrawing) { 4652 // If this group is dirty, check that the parent is dirty as well 4653 if ((mPrivateFlags & DIRTY_MASK) != 0) { 4654 final ViewParent parent = getParent(); 4655 if (parent != null && !(parent instanceof ViewRootImpl)) { 4656 if ((((View) parent).mPrivateFlags & DIRTY_MASK) == 0) { 4657 result = false; 4658 android.util.Log.d(ViewDebug.CONSISTENCY_LOG_TAG, 4659 "ViewGroup " + this + " is dirty but its parent is not: " + this); 4660 } 4661 } 4662 } 4663 } 4664 4665 return result; 4666 } 4667 4668 /** 4669 * {@inheritDoc} 4670 */ 4671 @Override 4672 protected void debug(int depth) { 4673 super.debug(depth); 4674 String output; 4675 4676 if (mFocused != null) { 4677 output = debugIndent(depth); 4678 output += "mFocused"; 4679 Log.d(VIEW_LOG_TAG, output); 4680 } 4681 if (mChildrenCount != 0) { 4682 output = debugIndent(depth); 4683 output += "{"; 4684 Log.d(VIEW_LOG_TAG, output); 4685 } 4686 int count = mChildrenCount; 4687 for (int i = 0; i < count; i++) { 4688 View child = mChildren[i]; 4689 child.debug(depth + 1); 4690 } 4691 4692 if (mChildrenCount != 0) { 4693 output = debugIndent(depth); 4694 output += "}"; 4695 Log.d(VIEW_LOG_TAG, output); 4696 } 4697 } 4698 4699 /** 4700 * Returns the position in the group of the specified child view. 4701 * 4702 * @param child the view for which to get the position 4703 * @return a positive integer representing the position of the view in the 4704 * group, or -1 if the view does not exist in the group 4705 */ 4706 public int indexOfChild(View child) { 4707 final int count = mChildrenCount; 4708 final View[] children = mChildren; 4709 for (int i = 0; i < count; i++) { 4710 if (children[i] == child) { 4711 return i; 4712 } 4713 } 4714 return -1; 4715 } 4716 4717 /** 4718 * Returns the number of children in the group. 4719 * 4720 * @return a positive integer representing the number of children in 4721 * the group 4722 */ 4723 public int getChildCount() { 4724 return mChildrenCount; 4725 } 4726 4727 /** 4728 * Returns the view at the specified position in the group. 4729 * 4730 * @param index the position at which to get the view from 4731 * @return the view at the specified position or null if the position 4732 * does not exist within the group 4733 */ 4734 public View getChildAt(int index) { 4735 if (index < 0 || index >= mChildrenCount) { 4736 return null; 4737 } 4738 return mChildren[index]; 4739 } 4740 4741 /** 4742 * Ask all of the children of this view to measure themselves, taking into 4743 * account both the MeasureSpec requirements for this view and its padding. 4744 * We skip children that are in the GONE state The heavy lifting is done in 4745 * getChildMeasureSpec. 4746 * 4747 * @param widthMeasureSpec The width requirements for this view 4748 * @param heightMeasureSpec The height requirements for this view 4749 */ 4750 protected void measureChildren(int widthMeasureSpec, int heightMeasureSpec) { 4751 final int size = mChildrenCount; 4752 final View[] children = mChildren; 4753 for (int i = 0; i < size; ++i) { 4754 final View child = children[i]; 4755 if ((child.mViewFlags & VISIBILITY_MASK) != GONE) { 4756 measureChild(child, widthMeasureSpec, heightMeasureSpec); 4757 } 4758 } 4759 } 4760 4761 /** 4762 * Ask one of the children of this view to measure itself, taking into 4763 * account both the MeasureSpec requirements for this view and its padding. 4764 * The heavy lifting is done in getChildMeasureSpec. 4765 * 4766 * @param child The child to measure 4767 * @param parentWidthMeasureSpec The width requirements for this view 4768 * @param parentHeightMeasureSpec The height requirements for this view 4769 */ 4770 protected void measureChild(View child, int parentWidthMeasureSpec, 4771 int parentHeightMeasureSpec) { 4772 final LayoutParams lp = child.getLayoutParams(); 4773 4774 final int childWidthMeasureSpec = getChildMeasureSpec(parentWidthMeasureSpec, 4775 mPaddingLeft + mPaddingRight, lp.width); 4776 final int childHeightMeasureSpec = getChildMeasureSpec(parentHeightMeasureSpec, 4777 mPaddingTop + mPaddingBottom, lp.height); 4778 4779 child.measure(childWidthMeasureSpec, childHeightMeasureSpec); 4780 } 4781 4782 /** 4783 * Ask one of the children of this view to measure itself, taking into 4784 * account both the MeasureSpec requirements for this view and its padding 4785 * and margins. The child must have MarginLayoutParams The heavy lifting is 4786 * done in getChildMeasureSpec. 4787 * 4788 * @param child The child to measure 4789 * @param parentWidthMeasureSpec The width requirements for this view 4790 * @param widthUsed Extra space that has been used up by the parent 4791 * horizontally (possibly by other children of the parent) 4792 * @param parentHeightMeasureSpec The height requirements for this view 4793 * @param heightUsed Extra space that has been used up by the parent 4794 * vertically (possibly by other children of the parent) 4795 */ 4796 protected void measureChildWithMargins(View child, 4797 int parentWidthMeasureSpec, int widthUsed, 4798 int parentHeightMeasureSpec, int heightUsed) { 4799 final MarginLayoutParams lp = (MarginLayoutParams) child.getLayoutParams(); 4800 4801 final int childWidthMeasureSpec = getChildMeasureSpec(parentWidthMeasureSpec, 4802 mPaddingLeft + mPaddingRight + lp.leftMargin + lp.rightMargin 4803 + widthUsed, lp.width); 4804 final int childHeightMeasureSpec = getChildMeasureSpec(parentHeightMeasureSpec, 4805 mPaddingTop + mPaddingBottom + lp.topMargin + lp.bottomMargin 4806 + heightUsed, lp.height); 4807 4808 child.measure(childWidthMeasureSpec, childHeightMeasureSpec); 4809 } 4810 4811 /** 4812 * Does the hard part of measureChildren: figuring out the MeasureSpec to 4813 * pass to a particular child. This method figures out the right MeasureSpec 4814 * for one dimension (height or width) of one child view. 4815 * 4816 * The goal is to combine information from our MeasureSpec with the 4817 * LayoutParams of the child to get the best possible results. For example, 4818 * if the this view knows its size (because its MeasureSpec has a mode of 4819 * EXACTLY), and the child has indicated in its LayoutParams that it wants 4820 * to be the same size as the parent, the parent should ask the child to 4821 * layout given an exact size. 4822 * 4823 * @param spec The requirements for this view 4824 * @param padding The padding of this view for the current dimension and 4825 * margins, if applicable 4826 * @param childDimension How big the child wants to be in the current 4827 * dimension 4828 * @return a MeasureSpec integer for the child 4829 */ 4830 public static int getChildMeasureSpec(int spec, int padding, int childDimension) { 4831 int specMode = MeasureSpec.getMode(spec); 4832 int specSize = MeasureSpec.getSize(spec); 4833 4834 int size = Math.max(0, specSize - padding); 4835 4836 int resultSize = 0; 4837 int resultMode = 0; 4838 4839 switch (specMode) { 4840 // Parent has imposed an exact size on us 4841 case MeasureSpec.EXACTLY: 4842 if (childDimension >= 0) { 4843 resultSize = childDimension; 4844 resultMode = MeasureSpec.EXACTLY; 4845 } else if (childDimension == LayoutParams.MATCH_PARENT) { 4846 // Child wants to be our size. So be it. 4847 resultSize = size; 4848 resultMode = MeasureSpec.EXACTLY; 4849 } else if (childDimension == LayoutParams.WRAP_CONTENT) { 4850 // Child wants to determine its own size. It can't be 4851 // bigger than us. 4852 resultSize = size; 4853 resultMode = MeasureSpec.AT_MOST; 4854 } 4855 break; 4856 4857 // Parent has imposed a maximum size on us 4858 case MeasureSpec.AT_MOST: 4859 if (childDimension >= 0) { 4860 // Child wants a specific size... so be it 4861 resultSize = childDimension; 4862 resultMode = MeasureSpec.EXACTLY; 4863 } else if (childDimension == LayoutParams.MATCH_PARENT) { 4864 // Child wants to be our size, but our size is not fixed. 4865 // Constrain child to not be bigger than us. 4866 resultSize = size; 4867 resultMode = MeasureSpec.AT_MOST; 4868 } else if (childDimension == LayoutParams.WRAP_CONTENT) { 4869 // Child wants to determine its own size. It can't be 4870 // bigger than us. 4871 resultSize = size; 4872 resultMode = MeasureSpec.AT_MOST; 4873 } 4874 break; 4875 4876 // Parent asked to see how big we want to be 4877 case MeasureSpec.UNSPECIFIED: 4878 if (childDimension >= 0) { 4879 // Child wants a specific size... let him have it 4880 resultSize = childDimension; 4881 resultMode = MeasureSpec.EXACTLY; 4882 } else if (childDimension == LayoutParams.MATCH_PARENT) { 4883 // Child wants to be our size... find out how big it should 4884 // be 4885 resultSize = 0; 4886 resultMode = MeasureSpec.UNSPECIFIED; 4887 } else if (childDimension == LayoutParams.WRAP_CONTENT) { 4888 // Child wants to determine its own size.... find out how 4889 // big it should be 4890 resultSize = 0; 4891 resultMode = MeasureSpec.UNSPECIFIED; 4892 } 4893 break; 4894 } 4895 return MeasureSpec.makeMeasureSpec(resultSize, resultMode); 4896 } 4897 4898 4899 /** 4900 * Removes any pending animations for views that have been removed. Call 4901 * this if you don't want animations for exiting views to stack up. 4902 */ 4903 public void clearDisappearingChildren() { 4904 if (mDisappearingChildren != null) { 4905 mDisappearingChildren.clear(); 4906 invalidate(); 4907 } 4908 } 4909 4910 /** 4911 * Add a view which is removed from mChildren but still needs animation 4912 * 4913 * @param v View to add 4914 */ 4915 private void addDisappearingView(View v) { 4916 ArrayList<View> disappearingChildren = mDisappearingChildren; 4917 4918 if (disappearingChildren == null) { 4919 disappearingChildren = mDisappearingChildren = new ArrayList<View>(); 4920 } 4921 4922 disappearingChildren.add(v); 4923 } 4924 4925 /** 4926 * Cleanup a view when its animation is done. This may mean removing it from 4927 * the list of disappearing views. 4928 * 4929 * @param view The view whose animation has finished 4930 * @param animation The animation, cannot be null 4931 */ 4932 void finishAnimatingView(final View view, Animation animation) { 4933 final ArrayList<View> disappearingChildren = mDisappearingChildren; 4934 if (disappearingChildren != null) { 4935 if (disappearingChildren.contains(view)) { 4936 disappearingChildren.remove(view); 4937 4938 if (view.mAttachInfo != null) { 4939 view.dispatchDetachedFromWindow(); 4940 } 4941 4942 view.clearAnimation(); 4943 mGroupFlags |= FLAG_INVALIDATE_REQUIRED; 4944 } 4945 } 4946 4947 if (animation != null && !animation.getFillAfter()) { 4948 view.clearAnimation(); 4949 } 4950 4951 if ((view.mPrivateFlags & ANIMATION_STARTED) == ANIMATION_STARTED) { 4952 view.onAnimationEnd(); 4953 // Should be performed by onAnimationEnd() but this avoid an infinite loop, 4954 // so we'd rather be safe than sorry 4955 view.mPrivateFlags &= ~ANIMATION_STARTED; 4956 // Draw one more frame after the animation is done 4957 mGroupFlags |= FLAG_INVALIDATE_REQUIRED; 4958 } 4959 } 4960 4961 /** 4962 * Utility function called by View during invalidation to determine whether a view that 4963 * is invisible or gone should still be invalidated because it is being transitioned (and 4964 * therefore still needs to be drawn). 4965 */ 4966 boolean isViewTransitioning(View view) { 4967 return (mTransitioningViews != null && mTransitioningViews.contains(view)); 4968 } 4969 4970 /** 4971 * This method tells the ViewGroup that the given View object, which should have this 4972 * ViewGroup as its parent, 4973 * should be kept around (re-displayed when the ViewGroup draws its children) even if it 4974 * is removed from its parent. This allows animations, such as those used by 4975 * {@link android.app.Fragment} and {@link android.animation.LayoutTransition} to animate 4976 * the removal of views. A call to this method should always be accompanied by a later call 4977 * to {@link #endViewTransition(View)}, such as after an animation on the View has finished, 4978 * so that the View finally gets removed. 4979 * 4980 * @param view The View object to be kept visible even if it gets removed from its parent. 4981 */ 4982 public void startViewTransition(View view) { 4983 if (view.mParent == this) { 4984 if (mTransitioningViews == null) { 4985 mTransitioningViews = new ArrayList<View>(); 4986 } 4987 mTransitioningViews.add(view); 4988 } 4989 } 4990 4991 /** 4992 * This method should always be called following an earlier call to 4993 * {@link #startViewTransition(View)}. The given View is finally removed from its parent 4994 * and will no longer be displayed. Note that this method does not perform the functionality 4995 * of removing a view from its parent; it just discontinues the display of a View that 4996 * has previously been removed. 4997 * 4998 * @return view The View object that has been removed but is being kept around in the visible 4999 * hierarchy by an earlier call to {@link #startViewTransition(View)}. 5000 */ 5001 public void endViewTransition(View view) { 5002 if (mTransitioningViews != null) { 5003 mTransitioningViews.remove(view); 5004 final ArrayList<View> disappearingChildren = mDisappearingChildren; 5005 if (disappearingChildren != null && disappearingChildren.contains(view)) { 5006 disappearingChildren.remove(view); 5007 if (mVisibilityChangingChildren != null && 5008 mVisibilityChangingChildren.contains(view)) { 5009 mVisibilityChangingChildren.remove(view); 5010 } else { 5011 if (view.mAttachInfo != null) { 5012 view.dispatchDetachedFromWindow(); 5013 } 5014 if (view.mParent != null) { 5015 view.mParent = null; 5016 } 5017 } 5018 invalidate(); 5019 } 5020 } 5021 } 5022 5023 private LayoutTransition.TransitionListener mLayoutTransitionListener = 5024 new LayoutTransition.TransitionListener() { 5025 @Override 5026 public void startTransition(LayoutTransition transition, ViewGroup container, 5027 View view, int transitionType) { 5028 // We only care about disappearing items, since we need special logic to keep 5029 // those items visible after they've been 'removed' 5030 if (transitionType == LayoutTransition.DISAPPEARING) { 5031 startViewTransition(view); 5032 } 5033 } 5034 5035 @Override 5036 public void endTransition(LayoutTransition transition, ViewGroup container, 5037 View view, int transitionType) { 5038 if (mLayoutSuppressed && !transition.isChangingLayout()) { 5039 requestLayout(); 5040 mLayoutSuppressed = false; 5041 } 5042 if (transitionType == LayoutTransition.DISAPPEARING && mTransitioningViews != null) { 5043 endViewTransition(view); 5044 } 5045 } 5046 }; 5047 5048 /** 5049 * {@inheritDoc} 5050 */ 5051 @Override 5052 public boolean gatherTransparentRegion(Region region) { 5053 // If no transparent regions requested, we are always opaque. 5054 final boolean meOpaque = (mPrivateFlags & View.REQUEST_TRANSPARENT_REGIONS) == 0; 5055 if (meOpaque && region == null) { 5056 // The caller doesn't care about the region, so stop now. 5057 return true; 5058 } 5059 super.gatherTransparentRegion(region); 5060 final View[] children = mChildren; 5061 final int count = mChildrenCount; 5062 boolean noneOfTheChildrenAreTransparent = true; 5063 for (int i = 0; i < count; i++) { 5064 final View child = children[i]; 5065 if ((child.mViewFlags & VISIBILITY_MASK) == VISIBLE || child.getAnimation() != null) { 5066 if (!child.gatherTransparentRegion(region)) { 5067 noneOfTheChildrenAreTransparent = false; 5068 } 5069 } 5070 } 5071 return meOpaque || noneOfTheChildrenAreTransparent; 5072 } 5073 5074 /** 5075 * {@inheritDoc} 5076 */ 5077 public void requestTransparentRegion(View child) { 5078 if (child != null) { 5079 child.mPrivateFlags |= View.REQUEST_TRANSPARENT_REGIONS; 5080 if (mParent != null) { 5081 mParent.requestTransparentRegion(this); 5082 } 5083 } 5084 } 5085 5086 5087 @Override 5088 protected boolean fitSystemWindows(Rect insets) { 5089 boolean done = super.fitSystemWindows(insets); 5090 if (!done) { 5091 final int count = mChildrenCount; 5092 final View[] children = mChildren; 5093 for (int i = 0; i < count; i++) { 5094 done = children[i].fitSystemWindows(insets); 5095 if (done) { 5096 break; 5097 } 5098 } 5099 } 5100 return done; 5101 } 5102 5103 /** 5104 * Returns the animation listener to which layout animation events are 5105 * sent. 5106 * 5107 * @return an {@link android.view.animation.Animation.AnimationListener} 5108 */ 5109 public Animation.AnimationListener getLayoutAnimationListener() { 5110 return mAnimationListener; 5111 } 5112 5113 @Override 5114 protected void drawableStateChanged() { 5115 super.drawableStateChanged(); 5116 5117 if ((mGroupFlags & FLAG_NOTIFY_CHILDREN_ON_DRAWABLE_STATE_CHANGE) != 0) { 5118 if ((mGroupFlags & FLAG_ADD_STATES_FROM_CHILDREN) != 0) { 5119 throw new IllegalStateException("addStateFromChildren cannot be enabled if a" 5120 + " child has duplicateParentState set to true"); 5121 } 5122 5123 final View[] children = mChildren; 5124 final int count = mChildrenCount; 5125 5126 for (int i = 0; i < count; i++) { 5127 final View child = children[i]; 5128 if ((child.mViewFlags & DUPLICATE_PARENT_STATE) != 0) { 5129 child.refreshDrawableState(); 5130 } 5131 } 5132 } 5133 } 5134 5135 @Override 5136 public void jumpDrawablesToCurrentState() { 5137 super.jumpDrawablesToCurrentState(); 5138 final View[] children = mChildren; 5139 final int count = mChildrenCount; 5140 for (int i = 0; i < count; i++) { 5141 children[i].jumpDrawablesToCurrentState(); 5142 } 5143 } 5144 5145 @Override 5146 protected int[] onCreateDrawableState(int extraSpace) { 5147 if ((mGroupFlags & FLAG_ADD_STATES_FROM_CHILDREN) == 0) { 5148 return super.onCreateDrawableState(extraSpace); 5149 } 5150 5151 int need = 0; 5152 int n = getChildCount(); 5153 for (int i = 0; i < n; i++) { 5154 int[] childState = getChildAt(i).getDrawableState(); 5155 5156 if (childState != null) { 5157 need += childState.length; 5158 } 5159 } 5160 5161 int[] state = super.onCreateDrawableState(extraSpace + need); 5162 5163 for (int i = 0; i < n; i++) { 5164 int[] childState = getChildAt(i).getDrawableState(); 5165 5166 if (childState != null) { 5167 state = mergeDrawableStates(state, childState); 5168 } 5169 } 5170 5171 return state; 5172 } 5173 5174 /** 5175 * Sets whether this ViewGroup's drawable states also include 5176 * its children's drawable states. This is used, for example, to 5177 * make a group appear to be focused when its child EditText or button 5178 * is focused. 5179 */ 5180 public void setAddStatesFromChildren(boolean addsStates) { 5181 if (addsStates) { 5182 mGroupFlags |= FLAG_ADD_STATES_FROM_CHILDREN; 5183 } else { 5184 mGroupFlags &= ~FLAG_ADD_STATES_FROM_CHILDREN; 5185 } 5186 5187 refreshDrawableState(); 5188 } 5189 5190 /** 5191 * Returns whether this ViewGroup's drawable states also include 5192 * its children's drawable states. This is used, for example, to 5193 * make a group appear to be focused when its child EditText or button 5194 * is focused. 5195 */ 5196 public boolean addStatesFromChildren() { 5197 return (mGroupFlags & FLAG_ADD_STATES_FROM_CHILDREN) != 0; 5198 } 5199 5200 /** 5201 * If {link #addStatesFromChildren} is true, refreshes this group's 5202 * drawable state (to include the states from its children). 5203 */ 5204 public void childDrawableStateChanged(View child) { 5205 if ((mGroupFlags & FLAG_ADD_STATES_FROM_CHILDREN) != 0) { 5206 refreshDrawableState(); 5207 } 5208 } 5209 5210 /** 5211 * Specifies the animation listener to which layout animation events must 5212 * be sent. Only 5213 * {@link android.view.animation.Animation.AnimationListener#onAnimationStart(Animation)} 5214 * and 5215 * {@link android.view.animation.Animation.AnimationListener#onAnimationEnd(Animation)} 5216 * are invoked. 5217 * 5218 * @param animationListener the layout animation listener 5219 */ 5220 public void setLayoutAnimationListener(Animation.AnimationListener animationListener) { 5221 mAnimationListener = animationListener; 5222 } 5223 5224 /** 5225 * This method is called by LayoutTransition when there are 'changing' animations that need 5226 * to start after the layout/setup phase. The request is forwarded to the ViewAncestor, who 5227 * starts all pending transitions prior to the drawing phase in the current traversal. 5228 * 5229 * @param transition The LayoutTransition to be started on the next traversal. 5230 * 5231 * @hide 5232 */ 5233 public void requestTransitionStart(LayoutTransition transition) { 5234 ViewRootImpl viewAncestor = getViewRootImpl(); 5235 if (viewAncestor != null) { 5236 viewAncestor.requestTransitionStart(transition); 5237 } 5238 } 5239 5240 @Override 5241 public void onResolvedLayoutDirectionReset() { 5242 // Take care of resetting the children resolution too 5243 final int count = getChildCount(); 5244 for (int i = 0; i < count; i++) { 5245 final View child = getChildAt(i); 5246 if (child.getLayoutDirection() == LAYOUT_DIRECTION_INHERIT) { 5247 child.resetResolvedLayoutDirection(); 5248 } 5249 } 5250 } 5251 5252 @Override 5253 public void onResolvedTextDirectionReset() { 5254 // Take care of resetting the children resolution too 5255 final int count = getChildCount(); 5256 for (int i = 0; i < count; i++) { 5257 final View child = getChildAt(i); 5258 if (child.getTextDirection() == TEXT_DIRECTION_INHERIT) { 5259 child.resetResolvedTextDirection(); 5260 } 5261 } 5262 } 5263 5264 @Override 5265 public void onResolvedTextAlignmentReset() { 5266 // Take care of resetting the children resolution too 5267 final int count = getChildCount(); 5268 for (int i = 0; i < count; i++) { 5269 final View child = getChildAt(i); 5270 if (child.getTextAlignment() == TEXT_ALIGNMENT_INHERIT) { 5271 child.resetResolvedTextAlignment(); 5272 } 5273 } 5274 } 5275 5276 /** 5277 * Return true if the pressed state should be delayed for children or descendants of this 5278 * ViewGroup. Generally, this should be done for containers that can scroll, such as a List. 5279 * This prevents the pressed state from appearing when the user is actually trying to scroll 5280 * the content. 5281 * 5282 * The default implementation returns true for compatibility reasons. Subclasses that do 5283 * not scroll should generally override this method and return false. 5284 */ 5285 public boolean shouldDelayChildPressedState() { 5286 return true; 5287 } 5288 5289 /** @hide */ 5290 protected void onSetLayoutParams(View child, LayoutParams layoutParams) { 5291 } 5292 5293 /** 5294 * LayoutParams are used by views to tell their parents how they want to be 5295 * laid out. See 5296 * {@link android.R.styleable#ViewGroup_Layout ViewGroup Layout Attributes} 5297 * for a list of all child view attributes that this class supports. 5298 * 5299 * <p> 5300 * The base LayoutParams class just describes how big the view wants to be 5301 * for both width and height. For each dimension, it can specify one of: 5302 * <ul> 5303 * <li>FILL_PARENT (renamed MATCH_PARENT in API Level 8 and higher), which 5304 * means that the view wants to be as big as its parent (minus padding) 5305 * <li> WRAP_CONTENT, which means that the view wants to be just big enough 5306 * to enclose its content (plus padding) 5307 * <li> an exact number 5308 * </ul> 5309 * There are subclasses of LayoutParams for different subclasses of 5310 * ViewGroup. For example, AbsoluteLayout has its own subclass of 5311 * LayoutParams which adds an X and Y value.</p> 5312 * 5313 * <div class="special reference"> 5314 * <h3>Developer Guides</h3> 5315 * <p>For more information about creating user interface layouts, read the 5316 * <a href="{@docRoot}guide/topics/ui/declaring-layout.html">XML Layouts</a> developer 5317 * guide.</p></div> 5318 * 5319 * @attr ref android.R.styleable#ViewGroup_Layout_layout_height 5320 * @attr ref android.R.styleable#ViewGroup_Layout_layout_width 5321 */ 5322 public static class LayoutParams { 5323 /** 5324 * Special value for the height or width requested by a View. 5325 * FILL_PARENT means that the view wants to be as big as its parent, 5326 * minus the parent's padding, if any. This value is deprecated 5327 * starting in API Level 8 and replaced by {@link #MATCH_PARENT}. 5328 */ 5329 @SuppressWarnings({"UnusedDeclaration"}) 5330 @Deprecated 5331 public static final int FILL_PARENT = -1; 5332 5333 /** 5334 * Special value for the height or width requested by a View. 5335 * MATCH_PARENT means that the view wants to be as big as its parent, 5336 * minus the parent's padding, if any. Introduced in API Level 8. 5337 */ 5338 public static final int MATCH_PARENT = -1; 5339 5340 /** 5341 * Special value for the height or width requested by a View. 5342 * WRAP_CONTENT means that the view wants to be just large enough to fit 5343 * its own internal content, taking its own padding into account. 5344 */ 5345 public static final int WRAP_CONTENT = -2; 5346 5347 /** 5348 * Information about how wide the view wants to be. Can be one of the 5349 * constants FILL_PARENT (replaced by MATCH_PARENT , 5350 * in API Level 8) or WRAP_CONTENT. or an exact size. 5351 */ 5352 @ViewDebug.ExportedProperty(category = "layout", mapping = { 5353 @ViewDebug.IntToString(from = MATCH_PARENT, to = "MATCH_PARENT"), 5354 @ViewDebug.IntToString(from = WRAP_CONTENT, to = "WRAP_CONTENT") 5355 }) 5356 public int width; 5357 5358 /** 5359 * Information about how tall the view wants to be. Can be one of the 5360 * constants FILL_PARENT (replaced by MATCH_PARENT , 5361 * in API Level 8) or WRAP_CONTENT. or an exact size. 5362 */ 5363 @ViewDebug.ExportedProperty(category = "layout", mapping = { 5364 @ViewDebug.IntToString(from = MATCH_PARENT, to = "MATCH_PARENT"), 5365 @ViewDebug.IntToString(from = WRAP_CONTENT, to = "WRAP_CONTENT") 5366 }) 5367 public int height; 5368 5369 /** 5370 * Used to animate layouts. 5371 */ 5372 public LayoutAnimationController.AnimationParameters layoutAnimationParameters; 5373 5374 /** 5375 * Creates a new set of layout parameters. The values are extracted from 5376 * the supplied attributes set and context. The XML attributes mapped 5377 * to this set of layout parameters are: 5378 * 5379 * <ul> 5380 * <li><code>layout_width</code>: the width, either an exact value, 5381 * {@link #WRAP_CONTENT}, or {@link #FILL_PARENT} (replaced by 5382 * {@link #MATCH_PARENT} in API Level 8)</li> 5383 * <li><code>layout_height</code>: the height, either an exact value, 5384 * {@link #WRAP_CONTENT}, or {@link #FILL_PARENT} (replaced by 5385 * {@link #MATCH_PARENT} in API Level 8)</li> 5386 * </ul> 5387 * 5388 * @param c the application environment 5389 * @param attrs the set of attributes from which to extract the layout 5390 * parameters' values 5391 */ 5392 public LayoutParams(Context c, AttributeSet attrs) { 5393 TypedArray a = c.obtainStyledAttributes(attrs, R.styleable.ViewGroup_Layout); 5394 setBaseAttributes(a, 5395 R.styleable.ViewGroup_Layout_layout_width, 5396 R.styleable.ViewGroup_Layout_layout_height); 5397 a.recycle(); 5398 } 5399 5400 /** 5401 * Creates a new set of layout parameters with the specified width 5402 * and height. 5403 * 5404 * @param width the width, either {@link #WRAP_CONTENT}, 5405 * {@link #FILL_PARENT} (replaced by {@link #MATCH_PARENT} in 5406 * API Level 8), or a fixed size in pixels 5407 * @param height the height, either {@link #WRAP_CONTENT}, 5408 * {@link #FILL_PARENT} (replaced by {@link #MATCH_PARENT} in 5409 * API Level 8), or a fixed size in pixels 5410 */ 5411 public LayoutParams(int width, int height) { 5412 this.width = width; 5413 this.height = height; 5414 } 5415 5416 /** 5417 * Copy constructor. Clones the width and height values of the source. 5418 * 5419 * @param source The layout params to copy from. 5420 */ 5421 public LayoutParams(LayoutParams source) { 5422 this.width = source.width; 5423 this.height = source.height; 5424 } 5425 5426 /** 5427 * Used internally by MarginLayoutParams. 5428 * @hide 5429 */ 5430 LayoutParams() { 5431 } 5432 5433 /** 5434 * Extracts the layout parameters from the supplied attributes. 5435 * 5436 * @param a the style attributes to extract the parameters from 5437 * @param widthAttr the identifier of the width attribute 5438 * @param heightAttr the identifier of the height attribute 5439 */ 5440 protected void setBaseAttributes(TypedArray a, int widthAttr, int heightAttr) { 5441 width = a.getLayoutDimension(widthAttr, "layout_width"); 5442 height = a.getLayoutDimension(heightAttr, "layout_height"); 5443 } 5444 5445 /** 5446 * Resolve layout parameters depending on the layout direction. Subclasses that care about 5447 * layoutDirection changes should override this method. The default implementation does 5448 * nothing. 5449 * 5450 * @param layoutDirection the direction of the layout 5451 * 5452 * {@link View#LAYOUT_DIRECTION_LTR} 5453 * {@link View#LAYOUT_DIRECTION_RTL} 5454 */ 5455 public void onResolveLayoutDirection(int layoutDirection) { 5456 } 5457 5458 /** 5459 * Returns a String representation of this set of layout parameters. 5460 * 5461 * @param output the String to prepend to the internal representation 5462 * @return a String with the following format: output + 5463 * "ViewGroup.LayoutParams={ width=WIDTH, height=HEIGHT }" 5464 * 5465 * @hide 5466 */ 5467 public String debug(String output) { 5468 return output + "ViewGroup.LayoutParams={ width=" 5469 + sizeToString(width) + ", height=" + sizeToString(height) + " }"; 5470 } 5471 5472 /** 5473 * Use {@code canvas} to draw suitable debugging annotations for these LayoutParameters. 5474 * 5475 * @param view the view that contains these layout parameters 5476 * @param canvas the canvas on which to draw 5477 * 5478 * @hide 5479 */ 5480 public void onDebugDraw(View view, Canvas canvas) { 5481 } 5482 5483 /** 5484 * Converts the specified size to a readable String. 5485 * 5486 * @param size the size to convert 5487 * @return a String instance representing the supplied size 5488 * 5489 * @hide 5490 */ 5491 protected static String sizeToString(int size) { 5492 if (size == WRAP_CONTENT) { 5493 return "wrap-content"; 5494 } 5495 if (size == MATCH_PARENT) { 5496 return "match-parent"; 5497 } 5498 return String.valueOf(size); 5499 } 5500 } 5501 5502 /** 5503 * Per-child layout information for layouts that support margins. 5504 * See 5505 * {@link android.R.styleable#ViewGroup_MarginLayout ViewGroup Margin Layout Attributes} 5506 * for a list of all child view attributes that this class supports. 5507 */ 5508 public static class MarginLayoutParams extends ViewGroup.LayoutParams { 5509 /** 5510 * The left margin in pixels of the child. 5511 * Call {@link ViewGroup#setLayoutParams(LayoutParams)} after reassigning a new value 5512 * to this field. 5513 */ 5514 @ViewDebug.ExportedProperty(category = "layout") 5515 public int leftMargin; 5516 5517 /** 5518 * The top margin in pixels of the child. 5519 * Call {@link ViewGroup#setLayoutParams(LayoutParams)} after reassigning a new value 5520 * to this field. 5521 */ 5522 @ViewDebug.ExportedProperty(category = "layout") 5523 public int topMargin; 5524 5525 /** 5526 * The right margin in pixels of the child. 5527 * Call {@link ViewGroup#setLayoutParams(LayoutParams)} after reassigning a new value 5528 * to this field. 5529 */ 5530 @ViewDebug.ExportedProperty(category = "layout") 5531 public int rightMargin; 5532 5533 /** 5534 * The bottom margin in pixels of the child. 5535 * Call {@link ViewGroup#setLayoutParams(LayoutParams)} after reassigning a new value 5536 * to this field. 5537 */ 5538 @ViewDebug.ExportedProperty(category = "layout") 5539 public int bottomMargin; 5540 5541 /** 5542 * The start margin in pixels of the child. 5543 * Call {@link ViewGroup#setLayoutParams(LayoutParams)} after reassigning a new value 5544 * to this field. 5545 */ 5546 @ViewDebug.ExportedProperty(category = "layout") 5547 public int startMargin = DEFAULT_RELATIVE; 5548 5549 /** 5550 * The end margin in pixels of the child. 5551 * Call {@link ViewGroup#setLayoutParams(LayoutParams)} after reassigning a new value 5552 * to this field. 5553 */ 5554 @ViewDebug.ExportedProperty(category = "layout") 5555 public int endMargin = DEFAULT_RELATIVE; 5556 5557 /** 5558 * The default start and end margin. 5559 */ 5560 static private final int DEFAULT_RELATIVE = Integer.MIN_VALUE; 5561 5562 /** 5563 * Creates a new set of layout parameters. The values are extracted from 5564 * the supplied attributes set and context. 5565 * 5566 * @param c the application environment 5567 * @param attrs the set of attributes from which to extract the layout 5568 * parameters' values 5569 */ 5570 public MarginLayoutParams(Context c, AttributeSet attrs) { 5571 super(); 5572 5573 TypedArray a = c.obtainStyledAttributes(attrs, R.styleable.ViewGroup_MarginLayout); 5574 setBaseAttributes(a, 5575 R.styleable.ViewGroup_MarginLayout_layout_width, 5576 R.styleable.ViewGroup_MarginLayout_layout_height); 5577 5578 int margin = a.getDimensionPixelSize( 5579 com.android.internal.R.styleable.ViewGroup_MarginLayout_layout_margin, -1); 5580 if (margin >= 0) { 5581 leftMargin = margin; 5582 topMargin = margin; 5583 rightMargin= margin; 5584 bottomMargin = margin; 5585 } else { 5586 leftMargin = a.getDimensionPixelSize( 5587 R.styleable.ViewGroup_MarginLayout_layout_marginLeft, 0); 5588 topMargin = a.getDimensionPixelSize( 5589 R.styleable.ViewGroup_MarginLayout_layout_marginTop, 0); 5590 rightMargin = a.getDimensionPixelSize( 5591 R.styleable.ViewGroup_MarginLayout_layout_marginRight, 0); 5592 bottomMargin = a.getDimensionPixelSize( 5593 R.styleable.ViewGroup_MarginLayout_layout_marginBottom, 0); 5594 startMargin = a.getDimensionPixelSize( 5595 R.styleable.ViewGroup_MarginLayout_layout_marginStart, DEFAULT_RELATIVE); 5596 endMargin = a.getDimensionPixelSize( 5597 R.styleable.ViewGroup_MarginLayout_layout_marginEnd, DEFAULT_RELATIVE); 5598 } 5599 5600 a.recycle(); 5601 } 5602 5603 /** 5604 * {@inheritDoc} 5605 */ 5606 public MarginLayoutParams(int width, int height) { 5607 super(width, height); 5608 } 5609 5610 /** 5611 * Copy constructor. Clones the width, height and margin values of the source. 5612 * 5613 * @param source The layout params to copy from. 5614 */ 5615 public MarginLayoutParams(MarginLayoutParams source) { 5616 this.width = source.width; 5617 this.height = source.height; 5618 5619 this.leftMargin = source.leftMargin; 5620 this.topMargin = source.topMargin; 5621 this.rightMargin = source.rightMargin; 5622 this.bottomMargin = source.bottomMargin; 5623 this.startMargin = source.startMargin; 5624 this.endMargin = source.endMargin; 5625 } 5626 5627 /** 5628 * {@inheritDoc} 5629 */ 5630 public MarginLayoutParams(LayoutParams source) { 5631 super(source); 5632 } 5633 5634 /** 5635 * Sets the margins, in pixels. A call to {@link android.view.View#requestLayout()} needs 5636 * to be done so that the new margins are taken into account. Left and right margins may be 5637 * overriden by {@link android.view.View#requestLayout()} depending on layout direction. 5638 * 5639 * @param left the left margin size 5640 * @param top the top margin size 5641 * @param right the right margin size 5642 * @param bottom the bottom margin size 5643 * 5644 * @attr ref android.R.styleable#ViewGroup_MarginLayout_layout_marginLeft 5645 * @attr ref android.R.styleable#ViewGroup_MarginLayout_layout_marginTop 5646 * @attr ref android.R.styleable#ViewGroup_MarginLayout_layout_marginRight 5647 * @attr ref android.R.styleable#ViewGroup_MarginLayout_layout_marginBottom 5648 */ 5649 public void setMargins(int left, int top, int right, int bottom) { 5650 leftMargin = left; 5651 topMargin = top; 5652 rightMargin = right; 5653 bottomMargin = bottom; 5654 } 5655 5656 /** 5657 * Sets the relative margins, in pixels. A call to {@link android.view.View#requestLayout()} 5658 * needs to be done so that the new relative margins are taken into account. Left and right 5659 * margins may be overriden by {@link android.view.View#requestLayout()} depending on layout 5660 * direction. 5661 * 5662 * @param start the start margin size 5663 * @param top the top margin size 5664 * @param end the right margin size 5665 * @param bottom the bottom margin size 5666 * 5667 * @attr ref android.R.styleable#ViewGroup_MarginLayout_layout_marginStart 5668 * @attr ref android.R.styleable#ViewGroup_MarginLayout_layout_marginTop 5669 * @attr ref android.R.styleable#ViewGroup_MarginLayout_layout_marginEnd 5670 * @attr ref android.R.styleable#ViewGroup_MarginLayout_layout_marginBottom 5671 * 5672 * @hide 5673 */ 5674 public void setMarginsRelative(int start, int top, int end, int bottom) { 5675 startMargin = start; 5676 topMargin = top; 5677 endMargin = end; 5678 bottomMargin = bottom; 5679 } 5680 5681 /** 5682 * Returns the start margin in pixels. 5683 * 5684 * @attr ref android.R.styleable#ViewGroup_MarginLayout_layout_marginStart 5685 * 5686 * @return the start margin in pixels. 5687 */ 5688 public int getMarginStart() { 5689 return startMargin; 5690 } 5691 5692 /** 5693 * Returns the end margin in pixels. 5694 * 5695 * @attr ref android.R.styleable#ViewGroup_MarginLayout_layout_marginEnd 5696 * 5697 * @return the end margin in pixels. 5698 */ 5699 public int getMarginEnd() { 5700 return endMargin; 5701 } 5702 5703 /** 5704 * Check if margins are relative. 5705 * 5706 * @attr ref android.R.styleable#ViewGroup_MarginLayout_layout_marginStart 5707 * @attr ref android.R.styleable#ViewGroup_MarginLayout_layout_marginEnd 5708 * 5709 * @return true if either marginStart or marginEnd has been set 5710 */ 5711 public boolean isMarginRelative() { 5712 return (startMargin != DEFAULT_RELATIVE) || (endMargin != DEFAULT_RELATIVE); 5713 } 5714 5715 /** 5716 * This will be called by {@link android.view.View#requestLayout()}. Left and Right margins 5717 * may be overridden depending on layout direction. 5718 */ 5719 @Override 5720 public void onResolveLayoutDirection(int layoutDirection) { 5721 switch(layoutDirection) { 5722 case View.LAYOUT_DIRECTION_RTL: 5723 leftMargin = (endMargin > DEFAULT_RELATIVE) ? endMargin : leftMargin; 5724 rightMargin = (startMargin > DEFAULT_RELATIVE) ? startMargin : rightMargin; 5725 break; 5726 case View.LAYOUT_DIRECTION_LTR: 5727 default: 5728 leftMargin = (startMargin > DEFAULT_RELATIVE) ? startMargin : leftMargin; 5729 rightMargin = (endMargin > DEFAULT_RELATIVE) ? endMargin : rightMargin; 5730 break; 5731 } 5732 } 5733 5734 /** 5735 * @hide 5736 */ 5737 @Override 5738 public void onDebugDraw(View view, Canvas canvas) { 5739 drawRect(canvas, 5740 view.getLeft() - leftMargin, 5741 view.getTop() - topMargin, 5742 view.getRight() + rightMargin, 5743 view.getBottom() + bottomMargin, Color.MAGENTA); 5744 } 5745 } 5746 5747 /* Describes a touched view and the ids of the pointers that it has captured. 5748 * 5749 * This code assumes that pointer ids are always in the range 0..31 such that 5750 * it can use a bitfield to track which pointer ids are present. 5751 * As it happens, the lower layers of the input dispatch pipeline also use the 5752 * same trick so the assumption should be safe here... 5753 */ 5754 private static final class TouchTarget { 5755 private static final int MAX_RECYCLED = 32; 5756 private static final Object sRecycleLock = new Object(); 5757 private static TouchTarget sRecycleBin; 5758 private static int sRecycledCount; 5759 5760 public static final int ALL_POINTER_IDS = -1; // all ones 5761 5762 // The touched child view. 5763 public View child; 5764 5765 // The combined bit mask of pointer ids for all pointers captured by the target. 5766 public int pointerIdBits; 5767 5768 // The next target in the target list. 5769 public TouchTarget next; 5770 5771 private TouchTarget() { 5772 } 5773 5774 public static TouchTarget obtain(View child, int pointerIdBits) { 5775 final TouchTarget target; 5776 synchronized (sRecycleLock) { 5777 if (sRecycleBin == null) { 5778 target = new TouchTarget(); 5779 } else { 5780 target = sRecycleBin; 5781 sRecycleBin = target.next; 5782 sRecycledCount--; 5783 target.next = null; 5784 } 5785 } 5786 target.child = child; 5787 target.pointerIdBits = pointerIdBits; 5788 return target; 5789 } 5790 5791 public void recycle() { 5792 synchronized (sRecycleLock) { 5793 if (sRecycledCount < MAX_RECYCLED) { 5794 next = sRecycleBin; 5795 sRecycleBin = this; 5796 sRecycledCount += 1; 5797 } else { 5798 next = null; 5799 } 5800 child = null; 5801 } 5802 } 5803 } 5804 5805 /* Describes a hovered view. */ 5806 private static final class HoverTarget { 5807 private static final int MAX_RECYCLED = 32; 5808 private static final Object sRecycleLock = new Object(); 5809 private static HoverTarget sRecycleBin; 5810 private static int sRecycledCount; 5811 5812 // The hovered child view. 5813 public View child; 5814 5815 // The next target in the target list. 5816 public HoverTarget next; 5817 5818 private HoverTarget() { 5819 } 5820 5821 public static HoverTarget obtain(View child) { 5822 final HoverTarget target; 5823 synchronized (sRecycleLock) { 5824 if (sRecycleBin == null) { 5825 target = new HoverTarget(); 5826 } else { 5827 target = sRecycleBin; 5828 sRecycleBin = target.next; 5829 sRecycledCount--; 5830 target.next = null; 5831 } 5832 } 5833 target.child = child; 5834 return target; 5835 } 5836 5837 public void recycle() { 5838 synchronized (sRecycleLock) { 5839 if (sRecycledCount < MAX_RECYCLED) { 5840 next = sRecycleBin; 5841 sRecycleBin = this; 5842 sRecycledCount += 1; 5843 } else { 5844 next = null; 5845 } 5846 child = null; 5847 } 5848 } 5849 } 5850 5851 /** 5852 * Pooled class that orderes the children of a ViewGroup from start 5853 * to end based on how they are laid out and the layout direction. 5854 */ 5855 static class ChildListForAccessibility { 5856 5857 private static final int MAX_POOL_SIZE = 32; 5858 5859 private static final Object sPoolLock = new Object(); 5860 5861 private static ChildListForAccessibility sPool; 5862 5863 private static int sPoolSize; 5864 5865 private boolean mIsPooled; 5866 5867 private ChildListForAccessibility mNext; 5868 5869 private final ArrayList<View> mChildren = new ArrayList<View>(); 5870 5871 private final ArrayList<ViewLocationHolder> mHolders = new ArrayList<ViewLocationHolder>(); 5872 5873 public static ChildListForAccessibility obtain(ViewGroup parent, boolean sort) { 5874 ChildListForAccessibility list = null; 5875 synchronized (sPoolLock) { 5876 if (sPool != null) { 5877 list = sPool; 5878 sPool = list.mNext; 5879 list.mNext = null; 5880 list.mIsPooled = false; 5881 sPoolSize--; 5882 } else { 5883 list = new ChildListForAccessibility(); 5884 } 5885 list.init(parent, sort); 5886 return list; 5887 } 5888 } 5889 5890 public void recycle() { 5891 if (mIsPooled) { 5892 throw new IllegalStateException("Instance already recycled."); 5893 } 5894 clear(); 5895 synchronized (sPoolLock) { 5896 if (sPoolSize < MAX_POOL_SIZE) { 5897 mNext = sPool; 5898 mIsPooled = true; 5899 sPool = this; 5900 sPoolSize++; 5901 } 5902 } 5903 } 5904 5905 public int getChildCount() { 5906 return mChildren.size(); 5907 } 5908 5909 public View getChildAt(int index) { 5910 return mChildren.get(index); 5911 } 5912 5913 public int getChildIndex(View child) { 5914 return mChildren.indexOf(child); 5915 } 5916 5917 private void init(ViewGroup parent, boolean sort) { 5918 ArrayList<View> children = mChildren; 5919 final int childCount = parent.getChildCount(); 5920 for (int i = 0; i < childCount; i++) { 5921 View child = parent.getChildAt(i); 5922 children.add(child); 5923 } 5924 if (sort) { 5925 ArrayList<ViewLocationHolder> holders = mHolders; 5926 for (int i = 0; i < childCount; i++) { 5927 View child = children.get(i); 5928 ViewLocationHolder holder = ViewLocationHolder.obtain(parent, child); 5929 holders.add(holder); 5930 } 5931 Collections.sort(holders); 5932 for (int i = 0; i < childCount; i++) { 5933 ViewLocationHolder holder = holders.get(i); 5934 children.set(i, holder.mView); 5935 holder.recycle(); 5936 } 5937 holders.clear(); 5938 } 5939 } 5940 5941 private void clear() { 5942 mChildren.clear(); 5943 } 5944 } 5945 5946 /** 5947 * Pooled class that holds a View and its location with respect to 5948 * a specified root. This enables sorting of views based on their 5949 * coordinates without recomputing the position relative to the root 5950 * on every comparison. 5951 */ 5952 static class ViewLocationHolder implements Comparable<ViewLocationHolder> { 5953 5954 private static final int MAX_POOL_SIZE = 32; 5955 5956 private static final Object sPoolLock = new Object(); 5957 5958 private static ViewLocationHolder sPool; 5959 5960 private static int sPoolSize; 5961 5962 private boolean mIsPooled; 5963 5964 private ViewLocationHolder mNext; 5965 5966 private final Rect mLocation = new Rect(); 5967 5968 public View mView; 5969 5970 private int mLayoutDirection; 5971 5972 public static ViewLocationHolder obtain(ViewGroup root, View view) { 5973 ViewLocationHolder holder = null; 5974 synchronized (sPoolLock) { 5975 if (sPool != null) { 5976 holder = sPool; 5977 sPool = holder.mNext; 5978 holder.mNext = null; 5979 holder.mIsPooled = false; 5980 sPoolSize--; 5981 } else { 5982 holder = new ViewLocationHolder(); 5983 } 5984 holder.init(root, view); 5985 return holder; 5986 } 5987 } 5988 5989 public void recycle() { 5990 if (mIsPooled) { 5991 throw new IllegalStateException("Instance already recycled."); 5992 } 5993 clear(); 5994 synchronized (sPoolLock) { 5995 if (sPoolSize < MAX_POOL_SIZE) { 5996 mNext = sPool; 5997 mIsPooled = true; 5998 sPool = this; 5999 sPoolSize++; 6000 } 6001 } 6002 } 6003 6004 @Override 6005 public int compareTo(ViewLocationHolder another) { 6006 // This instance is greater than an invalid argument. 6007 if (another == null) { 6008 return 1; 6009 } 6010 if (getClass() != another.getClass()) { 6011 return 1; 6012 } 6013 // First is above second. 6014 if (mLocation.bottom - another.mLocation.top <= 0) { 6015 return -1; 6016 } 6017 // First is below second. 6018 if (mLocation.top - another.mLocation.bottom >= 0) { 6019 return 1; 6020 } 6021 // LTR 6022 if (mLayoutDirection == LAYOUT_DIRECTION_LTR) { 6023 final int leftDifference = mLocation.left - another.mLocation.left; 6024 // First more to the left than second. 6025 if (leftDifference != 0) { 6026 return leftDifference; 6027 } 6028 } else { // RTL 6029 final int rightDifference = mLocation.right - another.mLocation.right; 6030 // First more to the right than second. 6031 if (rightDifference != 0) { 6032 return -rightDifference; 6033 } 6034 } 6035 // Break tie by top. 6036 final int topDiference = mLocation.top - another.mLocation.top; 6037 if (topDiference != 0) { 6038 return topDiference; 6039 } 6040 // Break tie by height. 6041 final int heightDiference = mLocation.height() - another.mLocation.height(); 6042 if (heightDiference != 0) { 6043 return -heightDiference; 6044 } 6045 // Break tie by width. 6046 final int widthDiference = mLocation.width() - another.mLocation.width(); 6047 if (widthDiference != 0) { 6048 return -widthDiference; 6049 } 6050 // Just break the tie somehow. The accessibliity ids are unique 6051 // and stable, hence this is deterministic tie breaking. 6052 return mView.getAccessibilityViewId() - another.mView.getAccessibilityViewId(); 6053 } 6054 6055 private void init(ViewGroup root, View view) { 6056 Rect viewLocation = mLocation; 6057 view.getDrawingRect(viewLocation); 6058 root.offsetDescendantRectToMyCoords(view, viewLocation); 6059 mView = view; 6060 mLayoutDirection = root.getResolvedLayoutDirection(); 6061 } 6062 6063 private void clear() { 6064 mView = null; 6065 mLocation.set(0, 0, 0, 0); 6066 } 6067 } 6068 6069 private static Paint getDebugPaint() { 6070 if (sDebugPaint == null) { 6071 sDebugPaint = new Paint(); 6072 sDebugPaint.setAntiAlias(false); 6073 } 6074 return sDebugPaint; 6075 } 6076 6077 private static float[] getDebugLines(int x1, int y1, int x2, int y2) { 6078 if (sDebugLines== null) { 6079 sDebugLines = new float[16]; 6080 } 6081 6082 x2--; 6083 y2--; 6084 6085 sDebugLines[0] = x1; 6086 sDebugLines[1] = y1; 6087 sDebugLines[2] = x2; 6088 sDebugLines[3] = y1; 6089 6090 sDebugLines[4] = x2; 6091 sDebugLines[5] = y1; 6092 sDebugLines[6] = x2; 6093 sDebugLines[7] = y2 + 1; 6094 6095 sDebugLines[8] = x2 + 1; 6096 sDebugLines[9] = y2; 6097 sDebugLines[10] = x1; 6098 sDebugLines[11] = y2; 6099 6100 sDebugLines[12] = x1; 6101 sDebugLines[13] = y2; 6102 sDebugLines[14] = x1; 6103 sDebugLines[15] = y1; 6104 6105 return sDebugLines; 6106 } 6107} 6108