ViewGroup.java revision cbc6774ef0285956da74193e5d217738e7411830
1/* 2 * Copyright (C) 2006 The Android Open Source Project 3 * 4 * Licensed under the Apache License, Version 2.0 (the "License"); 5 * you may not use this file except in compliance with the License. 6 * You may obtain a copy of the License at 7 * 8 * http://www.apache.org/licenses/LICENSE-2.0 9 * 10 * Unless required by applicable law or agreed to in writing, software 11 * distributed under the License is distributed on an "AS IS" BASIS, 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 13 * See the License for the specific language governing permissions and 14 * limitations under the License. 15 */ 16 17package android.view; 18 19import android.animation.LayoutTransition; 20import android.content.Context; 21import android.content.res.Configuration; 22import android.content.res.TypedArray; 23import android.graphics.Bitmap; 24import android.graphics.Canvas; 25import android.graphics.Color; 26import android.graphics.Insets; 27import android.graphics.Matrix; 28import android.graphics.Paint; 29import android.graphics.PointF; 30import android.graphics.Rect; 31import android.graphics.RectF; 32import android.graphics.Region; 33import android.os.Build; 34import android.os.Parcelable; 35import android.os.SystemClock; 36import android.util.AttributeSet; 37import android.util.Log; 38import android.util.SparseArray; 39import android.view.accessibility.AccessibilityEvent; 40import android.view.accessibility.AccessibilityNodeInfo; 41import android.view.animation.Animation; 42import android.view.animation.AnimationUtils; 43import android.view.animation.LayoutAnimationController; 44import android.view.animation.Transformation; 45 46import com.android.internal.R; 47import com.android.internal.util.Predicate; 48 49import java.util.ArrayList; 50import java.util.Collections; 51import java.util.HashSet; 52 53/** 54 * <p> 55 * A <code>ViewGroup</code> is a special view that can contain other views 56 * (called children.) The view group is the base class for layouts and views 57 * containers. This class also defines the 58 * {@link android.view.ViewGroup.LayoutParams} class which serves as the base 59 * class for layouts parameters. 60 * </p> 61 * 62 * <p> 63 * Also see {@link LayoutParams} for layout attributes. 64 * </p> 65 * 66 * <div class="special reference"> 67 * <h3>Developer Guides</h3> 68 * <p>For more information about creating user interface layouts, read the 69 * <a href="{@docRoot}guide/topics/ui/declaring-layout.html">XML Layouts</a> developer 70 * guide.</p></div> 71 * 72 * @attr ref android.R.styleable#ViewGroup_clipChildren 73 * @attr ref android.R.styleable#ViewGroup_clipToPadding 74 * @attr ref android.R.styleable#ViewGroup_layoutAnimation 75 * @attr ref android.R.styleable#ViewGroup_animationCache 76 * @attr ref android.R.styleable#ViewGroup_persistentDrawingCache 77 * @attr ref android.R.styleable#ViewGroup_alwaysDrawnWithCache 78 * @attr ref android.R.styleable#ViewGroup_addStatesFromChildren 79 * @attr ref android.R.styleable#ViewGroup_descendantFocusability 80 * @attr ref android.R.styleable#ViewGroup_animateLayoutChanges 81 */ 82public abstract class ViewGroup extends View implements ViewParent, ViewManager { 83 private static final String TAG = "ViewGroup"; 84 85 private static final boolean DBG = false; 86 87 /** 88 * Views which have been hidden or removed which need to be animated on 89 * their way out. 90 * This field should be made private, so it is hidden from the SDK. 91 * {@hide} 92 */ 93 protected ArrayList<View> mDisappearingChildren; 94 95 /** 96 * Listener used to propagate events indicating when children are added 97 * and/or removed from a view group. 98 * This field should be made private, so it is hidden from the SDK. 99 * {@hide} 100 */ 101 protected OnHierarchyChangeListener mOnHierarchyChangeListener; 102 103 // The view contained within this ViewGroup that has or contains focus. 104 private View mFocused; 105 106 /** 107 * A Transformation used when drawing children, to 108 * apply on the child being drawn. 109 */ 110 final Transformation mChildTransformation = new Transformation(); 111 112 /** 113 * Used to track the current invalidation region. 114 */ 115 RectF mInvalidateRegion; 116 117 /** 118 * A Transformation used to calculate a correct 119 * invalidation area when the application is autoscaled. 120 */ 121 Transformation mInvalidationTransformation; 122 123 // View currently under an ongoing drag 124 private View mCurrentDragView; 125 126 // Metadata about the ongoing drag 127 private DragEvent mCurrentDrag; 128 private HashSet<View> mDragNotifiedChildren; 129 130 // Does this group have a child that can accept the current drag payload? 131 private boolean mChildAcceptsDrag; 132 133 // Used during drag dispatch 134 private final PointF mLocalPoint = new PointF(); 135 136 // Layout animation 137 private LayoutAnimationController mLayoutAnimationController; 138 private Animation.AnimationListener mAnimationListener; 139 140 // First touch target in the linked list of touch targets. 141 private TouchTarget mFirstTouchTarget; 142 143 // For debugging only. You can see these in hierarchyviewer. 144 @SuppressWarnings({"FieldCanBeLocal", "UnusedDeclaration"}) 145 @ViewDebug.ExportedProperty(category = "events") 146 private long mLastTouchDownTime; 147 @ViewDebug.ExportedProperty(category = "events") 148 private int mLastTouchDownIndex = -1; 149 @SuppressWarnings({"FieldCanBeLocal", "UnusedDeclaration"}) 150 @ViewDebug.ExportedProperty(category = "events") 151 private float mLastTouchDownX; 152 @SuppressWarnings({"FieldCanBeLocal", "UnusedDeclaration"}) 153 @ViewDebug.ExportedProperty(category = "events") 154 private float mLastTouchDownY; 155 156 // First hover target in the linked list of hover targets. 157 // The hover targets are children which have received ACTION_HOVER_ENTER. 158 // They might not have actually handled the hover event, but we will 159 // continue sending hover events to them as long as the pointer remains over 160 // their bounds and the view group does not intercept hover. 161 private HoverTarget mFirstHoverTarget; 162 163 // True if the view group itself received a hover event. 164 // It might not have actually handled the hover event. 165 private boolean mHoveredSelf; 166 167 /** 168 * Internal flags. 169 * 170 * This field should be made private, so it is hidden from the SDK. 171 * {@hide} 172 */ 173 protected int mGroupFlags; 174 175 /* 176 * THe layout mode: either {@link #UNDEFINED_LAYOUT_MODE}, {@link #COMPONENT_BOUNDS} or 177 * {@link #LAYOUT_BOUNDS} 178 */ 179 private int mLayoutMode = UNDEFINED_LAYOUT_MODE; 180 181 /** 182 * NOTE: If you change the flags below make sure to reflect the changes 183 * the DisplayList class 184 */ 185 186 // When set, ViewGroup invalidates only the child's rectangle 187 // Set by default 188 static final int FLAG_CLIP_CHILDREN = 0x1; 189 190 // When set, ViewGroup excludes the padding area from the invalidate rectangle 191 // Set by default 192 private static final int FLAG_CLIP_TO_PADDING = 0x2; 193 194 // When set, dispatchDraw() will invoke invalidate(); this is set by drawChild() when 195 // a child needs to be invalidated and FLAG_OPTIMIZE_INVALIDATE is set 196 static final int FLAG_INVALIDATE_REQUIRED = 0x4; 197 198 // When set, dispatchDraw() will run the layout animation and unset the flag 199 private static final int FLAG_RUN_ANIMATION = 0x8; 200 201 // When set, there is either no layout animation on the ViewGroup or the layout 202 // animation is over 203 // Set by default 204 static final int FLAG_ANIMATION_DONE = 0x10; 205 206 // If set, this ViewGroup has padding; if unset there is no padding and we don't need 207 // to clip it, even if FLAG_CLIP_TO_PADDING is set 208 private static final int FLAG_PADDING_NOT_NULL = 0x20; 209 210 // When set, this ViewGroup caches its children in a Bitmap before starting a layout animation 211 // Set by default 212 private static final int FLAG_ANIMATION_CACHE = 0x40; 213 214 // When set, this ViewGroup converts calls to invalidate(Rect) to invalidate() during a 215 // layout animation; this avoid clobbering the hierarchy 216 // Automatically set when the layout animation starts, depending on the animation's 217 // characteristics 218 static final int FLAG_OPTIMIZE_INVALIDATE = 0x80; 219 220 // When set, the next call to drawChild() will clear mChildTransformation's matrix 221 static final int FLAG_CLEAR_TRANSFORMATION = 0x100; 222 223 // When set, this ViewGroup invokes mAnimationListener.onAnimationEnd() and removes 224 // the children's Bitmap caches if necessary 225 // This flag is set when the layout animation is over (after FLAG_ANIMATION_DONE is set) 226 private static final int FLAG_NOTIFY_ANIMATION_LISTENER = 0x200; 227 228 /** 229 * When set, the drawing method will call {@link #getChildDrawingOrder(int, int)} 230 * to get the index of the child to draw for that iteration. 231 * 232 * @hide 233 */ 234 protected static final int FLAG_USE_CHILD_DRAWING_ORDER = 0x400; 235 236 /** 237 * When set, this ViewGroup supports static transformations on children; this causes 238 * {@link #getChildStaticTransformation(View, android.view.animation.Transformation)} to be 239 * invoked when a child is drawn. 240 * 241 * Any subclass overriding 242 * {@link #getChildStaticTransformation(View, android.view.animation.Transformation)} should 243 * set this flags in {@link #mGroupFlags}. 244 * 245 * {@hide} 246 */ 247 protected static final int FLAG_SUPPORT_STATIC_TRANSFORMATIONS = 0x800; 248 249 // When the previous drawChild() invocation used an alpha value that was lower than 250 // 1.0 and set it in mCachePaint 251 static final int FLAG_ALPHA_LOWER_THAN_ONE = 0x1000; 252 253 /** 254 * When set, this ViewGroup's drawable states also include those 255 * of its children. 256 */ 257 private static final int FLAG_ADD_STATES_FROM_CHILDREN = 0x2000; 258 259 /** 260 * When set, this ViewGroup tries to always draw its children using their drawing cache. 261 */ 262 static final int FLAG_ALWAYS_DRAWN_WITH_CACHE = 0x4000; 263 264 /** 265 * When set, and if FLAG_ALWAYS_DRAWN_WITH_CACHE is not set, this ViewGroup will try to 266 * draw its children with their drawing cache. 267 */ 268 static final int FLAG_CHILDREN_DRAWN_WITH_CACHE = 0x8000; 269 270 /** 271 * When set, this group will go through its list of children to notify them of 272 * any drawable state change. 273 */ 274 private static final int FLAG_NOTIFY_CHILDREN_ON_DRAWABLE_STATE_CHANGE = 0x10000; 275 276 private static final int FLAG_MASK_FOCUSABILITY = 0x60000; 277 278 /** 279 * This view will get focus before any of its descendants. 280 */ 281 public static final int FOCUS_BEFORE_DESCENDANTS = 0x20000; 282 283 /** 284 * This view will get focus only if none of its descendants want it. 285 */ 286 public static final int FOCUS_AFTER_DESCENDANTS = 0x40000; 287 288 /** 289 * This view will block any of its descendants from getting focus, even 290 * if they are focusable. 291 */ 292 public static final int FOCUS_BLOCK_DESCENDANTS = 0x60000; 293 294 /** 295 * Used to map between enum in attrubutes and flag values. 296 */ 297 private static final int[] DESCENDANT_FOCUSABILITY_FLAGS = 298 {FOCUS_BEFORE_DESCENDANTS, FOCUS_AFTER_DESCENDANTS, 299 FOCUS_BLOCK_DESCENDANTS}; 300 301 /** 302 * When set, this ViewGroup should not intercept touch events. 303 * {@hide} 304 */ 305 protected static final int FLAG_DISALLOW_INTERCEPT = 0x80000; 306 307 /** 308 * When set, this ViewGroup will split MotionEvents to multiple child Views when appropriate. 309 */ 310 private static final int FLAG_SPLIT_MOTION_EVENTS = 0x200000; 311 312 /** 313 * When set, this ViewGroup will not dispatch onAttachedToWindow calls 314 * to children when adding new views. This is used to prevent multiple 315 * onAttached calls when a ViewGroup adds children in its own onAttached method. 316 */ 317 private static final int FLAG_PREVENT_DISPATCH_ATTACHED_TO_WINDOW = 0x400000; 318 319 /** 320 * Indicates which types of drawing caches are to be kept in memory. 321 * This field should be made private, so it is hidden from the SDK. 322 * {@hide} 323 */ 324 protected int mPersistentDrawingCache; 325 326 /** 327 * Used to indicate that no drawing cache should be kept in memory. 328 */ 329 public static final int PERSISTENT_NO_CACHE = 0x0; 330 331 /** 332 * Used to indicate that the animation drawing cache should be kept in memory. 333 */ 334 public static final int PERSISTENT_ANIMATION_CACHE = 0x1; 335 336 /** 337 * Used to indicate that the scrolling drawing cache should be kept in memory. 338 */ 339 public static final int PERSISTENT_SCROLLING_CACHE = 0x2; 340 341 /** 342 * Used to indicate that all drawing caches should be kept in memory. 343 */ 344 public static final int PERSISTENT_ALL_CACHES = 0x3; 345 346 // Layout Modes 347 348 private static final int UNDEFINED_LAYOUT_MODE = -1; 349 350 /** 351 * This constant is a {@link #setLayoutMode(int) layoutMode}. 352 * Component bounds are the raw values of {@link #getLeft() left}, {@link #getTop() top}, 353 * {@link #getRight() right} and {@link #getBottom() bottom}. 354 */ 355 public static final int COMPONENT_BOUNDS = 0; 356 357 /** 358 * This constant is a {@link #setLayoutMode(int) layoutMode}. 359 */ 360 public static final int LAYOUT_BOUNDS = 1; 361 362 /** 363 * We clip to padding when FLAG_CLIP_TO_PADDING and FLAG_PADDING_NOT_NULL 364 * are set at the same time. 365 */ 366 protected static final int CLIP_TO_PADDING_MASK = FLAG_CLIP_TO_PADDING | FLAG_PADDING_NOT_NULL; 367 368 // Index of the child's left position in the mLocation array 369 private static final int CHILD_LEFT_INDEX = 0; 370 // Index of the child's top position in the mLocation array 371 private static final int CHILD_TOP_INDEX = 1; 372 373 // Child views of this ViewGroup 374 private View[] mChildren; 375 // Number of valid children in the mChildren array, the rest should be null or not 376 // considered as children 377 378 private boolean mLayoutSuppressed = false; 379 380 private int mChildrenCount; 381 382 private static final int ARRAY_INITIAL_CAPACITY = 12; 383 private static final int ARRAY_CAPACITY_INCREMENT = 12; 384 385 private static Paint sDebugPaint; 386 private static float[] sDebugLines; 387 388 // Used to draw cached views 389 Paint mCachePaint; 390 391 // Used to animate add/remove changes in layout 392 private LayoutTransition mTransition; 393 394 // The set of views that are currently being transitioned. This list is used to track views 395 // being removed that should not actually be removed from the parent yet because they are 396 // being animated. 397 private ArrayList<View> mTransitioningViews; 398 399 // List of children changing visibility. This is used to potentially keep rendering 400 // views during a transition when they otherwise would have become gone/invisible 401 private ArrayList<View> mVisibilityChangingChildren; 402 403 // Indicates whether this container will use its children layers to draw 404 @ViewDebug.ExportedProperty(category = "drawing") 405 boolean mDrawLayers = true; 406 407 // Indicates how many of this container's child subtrees contain transient state 408 @ViewDebug.ExportedProperty(category = "layout") 409 private int mChildCountWithTransientState = 0; 410 411 public ViewGroup(Context context) { 412 super(context); 413 initViewGroup(); 414 } 415 416 public ViewGroup(Context context, AttributeSet attrs) { 417 super(context, attrs); 418 initViewGroup(); 419 initFromAttributes(context, attrs); 420 } 421 422 public ViewGroup(Context context, AttributeSet attrs, int defStyle) { 423 super(context, attrs, defStyle); 424 initViewGroup(); 425 initFromAttributes(context, attrs); 426 } 427 428 private boolean debugDraw() { 429 return mAttachInfo != null && mAttachInfo.mDebugLayout; 430 } 431 432 private void initViewGroup() { 433 // ViewGroup doesn't draw by default 434 if (!debugDraw()) { 435 setFlags(WILL_NOT_DRAW, DRAW_MASK); 436 } 437 mGroupFlags |= FLAG_CLIP_CHILDREN; 438 mGroupFlags |= FLAG_CLIP_TO_PADDING; 439 mGroupFlags |= FLAG_ANIMATION_DONE; 440 mGroupFlags |= FLAG_ANIMATION_CACHE; 441 mGroupFlags |= FLAG_ALWAYS_DRAWN_WITH_CACHE; 442 443 if (mContext.getApplicationInfo().targetSdkVersion >= Build.VERSION_CODES.HONEYCOMB) { 444 mGroupFlags |= FLAG_SPLIT_MOTION_EVENTS; 445 } 446 447 setDescendantFocusability(FOCUS_BEFORE_DESCENDANTS); 448 449 mChildren = new View[ARRAY_INITIAL_CAPACITY]; 450 mChildrenCount = 0; 451 452 mPersistentDrawingCache = PERSISTENT_SCROLLING_CACHE; 453 } 454 455 private void initFromAttributes(Context context, AttributeSet attrs) { 456 TypedArray a = context.obtainStyledAttributes(attrs, 457 R.styleable.ViewGroup); 458 459 final int N = a.getIndexCount(); 460 for (int i = 0; i < N; i++) { 461 int attr = a.getIndex(i); 462 switch (attr) { 463 case R.styleable.ViewGroup_clipChildren: 464 setClipChildren(a.getBoolean(attr, true)); 465 break; 466 case R.styleable.ViewGroup_clipToPadding: 467 setClipToPadding(a.getBoolean(attr, true)); 468 break; 469 case R.styleable.ViewGroup_animationCache: 470 setAnimationCacheEnabled(a.getBoolean(attr, true)); 471 break; 472 case R.styleable.ViewGroup_persistentDrawingCache: 473 setPersistentDrawingCache(a.getInt(attr, PERSISTENT_SCROLLING_CACHE)); 474 break; 475 case R.styleable.ViewGroup_addStatesFromChildren: 476 setAddStatesFromChildren(a.getBoolean(attr, false)); 477 break; 478 case R.styleable.ViewGroup_alwaysDrawnWithCache: 479 setAlwaysDrawnWithCacheEnabled(a.getBoolean(attr, true)); 480 break; 481 case R.styleable.ViewGroup_layoutAnimation: 482 int id = a.getResourceId(attr, -1); 483 if (id > 0) { 484 setLayoutAnimation(AnimationUtils.loadLayoutAnimation(mContext, id)); 485 } 486 break; 487 case R.styleable.ViewGroup_descendantFocusability: 488 setDescendantFocusability(DESCENDANT_FOCUSABILITY_FLAGS[a.getInt(attr, 0)]); 489 break; 490 case R.styleable.ViewGroup_splitMotionEvents: 491 setMotionEventSplittingEnabled(a.getBoolean(attr, false)); 492 break; 493 case R.styleable.ViewGroup_animateLayoutChanges: 494 boolean animateLayoutChanges = a.getBoolean(attr, false); 495 if (animateLayoutChanges) { 496 setLayoutTransition(new LayoutTransition()); 497 } 498 break; 499 } 500 } 501 502 a.recycle(); 503 } 504 505 /** 506 * Gets the descendant focusability of this view group. The descendant 507 * focusability defines the relationship between this view group and its 508 * descendants when looking for a view to take focus in 509 * {@link #requestFocus(int, android.graphics.Rect)}. 510 * 511 * @return one of {@link #FOCUS_BEFORE_DESCENDANTS}, {@link #FOCUS_AFTER_DESCENDANTS}, 512 * {@link #FOCUS_BLOCK_DESCENDANTS}. 513 */ 514 @ViewDebug.ExportedProperty(category = "focus", mapping = { 515 @ViewDebug.IntToString(from = FOCUS_BEFORE_DESCENDANTS, to = "FOCUS_BEFORE_DESCENDANTS"), 516 @ViewDebug.IntToString(from = FOCUS_AFTER_DESCENDANTS, to = "FOCUS_AFTER_DESCENDANTS"), 517 @ViewDebug.IntToString(from = FOCUS_BLOCK_DESCENDANTS, to = "FOCUS_BLOCK_DESCENDANTS") 518 }) 519 public int getDescendantFocusability() { 520 return mGroupFlags & FLAG_MASK_FOCUSABILITY; 521 } 522 523 /** 524 * Set the descendant focusability of this view group. This defines the relationship 525 * between this view group and its descendants when looking for a view to 526 * take focus in {@link #requestFocus(int, android.graphics.Rect)}. 527 * 528 * @param focusability one of {@link #FOCUS_BEFORE_DESCENDANTS}, {@link #FOCUS_AFTER_DESCENDANTS}, 529 * {@link #FOCUS_BLOCK_DESCENDANTS}. 530 */ 531 public void setDescendantFocusability(int focusability) { 532 switch (focusability) { 533 case FOCUS_BEFORE_DESCENDANTS: 534 case FOCUS_AFTER_DESCENDANTS: 535 case FOCUS_BLOCK_DESCENDANTS: 536 break; 537 default: 538 throw new IllegalArgumentException("must be one of FOCUS_BEFORE_DESCENDANTS, " 539 + "FOCUS_AFTER_DESCENDANTS, FOCUS_BLOCK_DESCENDANTS"); 540 } 541 mGroupFlags &= ~FLAG_MASK_FOCUSABILITY; 542 mGroupFlags |= (focusability & FLAG_MASK_FOCUSABILITY); 543 } 544 545 /** 546 * {@inheritDoc} 547 */ 548 @Override 549 void handleFocusGainInternal(int direction, Rect previouslyFocusedRect) { 550 if (mFocused != null) { 551 mFocused.unFocus(); 552 mFocused = null; 553 } 554 super.handleFocusGainInternal(direction, previouslyFocusedRect); 555 } 556 557 /** 558 * {@inheritDoc} 559 */ 560 public void requestChildFocus(View child, View focused) { 561 if (DBG) { 562 System.out.println(this + " requestChildFocus()"); 563 } 564 if (getDescendantFocusability() == FOCUS_BLOCK_DESCENDANTS) { 565 return; 566 } 567 568 // Unfocus us, if necessary 569 super.unFocus(); 570 571 // We had a previous notion of who had focus. Clear it. 572 if (mFocused != child) { 573 if (mFocused != null) { 574 mFocused.unFocus(); 575 } 576 577 mFocused = child; 578 } 579 if (mParent != null) { 580 mParent.requestChildFocus(this, focused); 581 } 582 } 583 584 /** 585 * {@inheritDoc} 586 */ 587 public void focusableViewAvailable(View v) { 588 if (mParent != null 589 // shortcut: don't report a new focusable view if we block our descendants from 590 // getting focus 591 && (getDescendantFocusability() != FOCUS_BLOCK_DESCENDANTS) 592 // shortcut: don't report a new focusable view if we already are focused 593 // (and we don't prefer our descendants) 594 // 595 // note: knowing that mFocused is non-null is not a good enough reason 596 // to break the traversal since in that case we'd actually have to find 597 // the focused view and make sure it wasn't FOCUS_AFTER_DESCENDANTS and 598 // an ancestor of v; this will get checked for at ViewAncestor 599 && !(isFocused() && getDescendantFocusability() != FOCUS_AFTER_DESCENDANTS)) { 600 mParent.focusableViewAvailable(v); 601 } 602 } 603 604 /** 605 * {@inheritDoc} 606 */ 607 public boolean showContextMenuForChild(View originalView) { 608 return mParent != null && mParent.showContextMenuForChild(originalView); 609 } 610 611 /** 612 * {@inheritDoc} 613 */ 614 public ActionMode startActionModeForChild(View originalView, ActionMode.Callback callback) { 615 return mParent != null ? mParent.startActionModeForChild(originalView, callback) : null; 616 } 617 618 /** 619 * Find the nearest view in the specified direction that wants to take 620 * focus. 621 * 622 * @param focused The view that currently has focus 623 * @param direction One of FOCUS_UP, FOCUS_DOWN, FOCUS_LEFT, and 624 * FOCUS_RIGHT, or 0 for not applicable. 625 */ 626 public View focusSearch(View focused, int direction) { 627 if (isRootNamespace()) { 628 // root namespace means we should consider ourselves the top of the 629 // tree for focus searching; otherwise we could be focus searching 630 // into other tabs. see LocalActivityManager and TabHost for more info 631 return FocusFinder.getInstance().findNextFocus(this, focused, direction); 632 } else if (mParent != null) { 633 return mParent.focusSearch(focused, direction); 634 } 635 return null; 636 } 637 638 /** 639 * {@inheritDoc} 640 */ 641 public boolean requestChildRectangleOnScreen(View child, Rect rectangle, boolean immediate) { 642 return false; 643 } 644 645 /** 646 * {@inheritDoc} 647 */ 648 @Override 649 public boolean requestSendAccessibilityEvent(View child, AccessibilityEvent event) { 650 ViewParent parent = mParent; 651 if (parent == null) { 652 return false; 653 } 654 final boolean propagate = onRequestSendAccessibilityEvent(child, event); 655 if (!propagate) { 656 return false; 657 } 658 return parent.requestSendAccessibilityEvent(this, event); 659 } 660 661 /** 662 * Called when a child has requested sending an {@link AccessibilityEvent} and 663 * gives an opportunity to its parent to augment the event. 664 * <p> 665 * If an {@link android.view.View.AccessibilityDelegate} has been specified via calling 666 * {@link android.view.View#setAccessibilityDelegate(android.view.View.AccessibilityDelegate)} its 667 * {@link android.view.View.AccessibilityDelegate#onRequestSendAccessibilityEvent(ViewGroup, View, AccessibilityEvent)} 668 * is responsible for handling this call. 669 * </p> 670 * 671 * @param child The child which requests sending the event. 672 * @param event The event to be sent. 673 * @return True if the event should be sent. 674 * 675 * @see #requestSendAccessibilityEvent(View, AccessibilityEvent) 676 */ 677 public boolean onRequestSendAccessibilityEvent(View child, AccessibilityEvent event) { 678 if (mAccessibilityDelegate != null) { 679 return mAccessibilityDelegate.onRequestSendAccessibilityEvent(this, child, event); 680 } else { 681 return onRequestSendAccessibilityEventInternal(child, event); 682 } 683 } 684 685 /** 686 * @see #onRequestSendAccessibilityEvent(View, AccessibilityEvent) 687 * 688 * Note: Called from the default {@link View.AccessibilityDelegate}. 689 */ 690 boolean onRequestSendAccessibilityEventInternal(View child, AccessibilityEvent event) { 691 return true; 692 } 693 694 /** 695 * Called when a child view has changed whether or not it is tracking transient state. 696 * 697 * @hide 698 */ 699 public void childHasTransientStateChanged(View child, boolean childHasTransientState) { 700 final boolean oldHasTransientState = hasTransientState(); 701 if (childHasTransientState) { 702 mChildCountWithTransientState++; 703 } else { 704 mChildCountWithTransientState--; 705 } 706 707 final boolean newHasTransientState = hasTransientState(); 708 if (mParent != null && oldHasTransientState != newHasTransientState) { 709 try { 710 mParent.childHasTransientStateChanged(this, newHasTransientState); 711 } catch (AbstractMethodError e) { 712 Log.e(TAG, mParent.getClass().getSimpleName() + 713 " does not fully implement ViewParent", e); 714 } 715 } 716 } 717 718 /** 719 * @hide 720 */ 721 @Override 722 public boolean hasTransientState() { 723 return mChildCountWithTransientState > 0 || super.hasTransientState(); 724 } 725 726 /** 727 * {@inheritDoc} 728 */ 729 @Override 730 public boolean dispatchUnhandledMove(View focused, int direction) { 731 return mFocused != null && 732 mFocused.dispatchUnhandledMove(focused, direction); 733 } 734 735 /** 736 * {@inheritDoc} 737 */ 738 public void clearChildFocus(View child) { 739 if (DBG) { 740 System.out.println(this + " clearChildFocus()"); 741 } 742 743 mFocused = null; 744 if (mParent != null) { 745 mParent.clearChildFocus(this); 746 } 747 } 748 749 /** 750 * {@inheritDoc} 751 */ 752 @Override 753 public void clearFocus() { 754 if (DBG) { 755 System.out.println(this + " clearFocus()"); 756 } 757 if (mFocused == null) { 758 super.clearFocus(); 759 } else { 760 mFocused.clearFocus(); 761 mFocused = null; 762 } 763 } 764 765 /** 766 * {@inheritDoc} 767 */ 768 @Override 769 void unFocus() { 770 if (DBG) { 771 System.out.println(this + " unFocus()"); 772 } 773 if (mFocused == null) { 774 super.unFocus(); 775 } else { 776 mFocused.unFocus(); 777 mFocused = null; 778 } 779 } 780 781 /** 782 * Returns the focused child of this view, if any. The child may have focus 783 * or contain focus. 784 * 785 * @return the focused child or null. 786 */ 787 public View getFocusedChild() { 788 return mFocused; 789 } 790 791 /** 792 * Returns true if this view has or contains focus 793 * 794 * @return true if this view has or contains focus 795 */ 796 @Override 797 public boolean hasFocus() { 798 return (mPrivateFlags & FOCUSED) != 0 || mFocused != null; 799 } 800 801 /* 802 * (non-Javadoc) 803 * 804 * @see android.view.View#findFocus() 805 */ 806 @Override 807 public View findFocus() { 808 if (DBG) { 809 System.out.println("Find focus in " + this + ": flags=" 810 + isFocused() + ", child=" + mFocused); 811 } 812 813 if (isFocused()) { 814 return this; 815 } 816 817 if (mFocused != null) { 818 return mFocused.findFocus(); 819 } 820 return null; 821 } 822 823 /** 824 * {@inheritDoc} 825 */ 826 @Override 827 public boolean hasFocusable() { 828 if ((mViewFlags & VISIBILITY_MASK) != VISIBLE) { 829 return false; 830 } 831 832 if (isFocusable()) { 833 return true; 834 } 835 836 final int descendantFocusability = getDescendantFocusability(); 837 if (descendantFocusability != FOCUS_BLOCK_DESCENDANTS) { 838 final int count = mChildrenCount; 839 final View[] children = mChildren; 840 841 for (int i = 0; i < count; i++) { 842 final View child = children[i]; 843 if (child.hasFocusable()) { 844 return true; 845 } 846 } 847 } 848 849 return false; 850 } 851 852 /** 853 * {@inheritDoc} 854 */ 855 @Override 856 public void addFocusables(ArrayList<View> views, int direction) { 857 addFocusables(views, direction, FOCUSABLES_TOUCH_MODE); 858 } 859 860 /** 861 * {@inheritDoc} 862 */ 863 @Override 864 public void addFocusables(ArrayList<View> views, int direction, int focusableMode) { 865 final int focusableCount = views.size(); 866 867 final int descendantFocusability = getDescendantFocusability(); 868 869 if (descendantFocusability != FOCUS_BLOCK_DESCENDANTS) { 870 final int count = mChildrenCount; 871 final View[] children = mChildren; 872 873 for (int i = 0; i < count; i++) { 874 final View child = children[i]; 875 if ((child.mViewFlags & VISIBILITY_MASK) == VISIBLE) { 876 child.addFocusables(views, direction, focusableMode); 877 } 878 } 879 } 880 881 // we add ourselves (if focusable) in all cases except for when we are 882 // FOCUS_AFTER_DESCENDANTS and there are some descendants focusable. this is 883 // to avoid the focus search finding layouts when a more precise search 884 // among the focusable children would be more interesting. 885 if ( 886 descendantFocusability != FOCUS_AFTER_DESCENDANTS || 887 // No focusable descendants 888 (focusableCount == views.size())) { 889 super.addFocusables(views, direction, focusableMode); 890 } 891 } 892 893 @Override 894 public void findViewsWithText(ArrayList<View> outViews, CharSequence text, int flags) { 895 super.findViewsWithText(outViews, text, flags); 896 final int childrenCount = mChildrenCount; 897 final View[] children = mChildren; 898 for (int i = 0; i < childrenCount; i++) { 899 View child = children[i]; 900 if ((child.mViewFlags & VISIBILITY_MASK) == VISIBLE 901 && (child.mPrivateFlags & IS_ROOT_NAMESPACE) == 0) { 902 child.findViewsWithText(outViews, text, flags); 903 } 904 } 905 } 906 907 @Override 908 View findViewByAccessibilityIdTraversal(int accessibilityId) { 909 View foundView = super.findViewByAccessibilityIdTraversal(accessibilityId); 910 if (foundView != null) { 911 return foundView; 912 } 913 final int childrenCount = mChildrenCount; 914 final View[] children = mChildren; 915 for (int i = 0; i < childrenCount; i++) { 916 View child = children[i]; 917 foundView = child.findViewByAccessibilityIdTraversal(accessibilityId); 918 if (foundView != null) { 919 return foundView; 920 } 921 } 922 return null; 923 } 924 925 /** 926 * {@inheritDoc} 927 */ 928 @Override 929 public void dispatchWindowFocusChanged(boolean hasFocus) { 930 super.dispatchWindowFocusChanged(hasFocus); 931 final int count = mChildrenCount; 932 final View[] children = mChildren; 933 for (int i = 0; i < count; i++) { 934 children[i].dispatchWindowFocusChanged(hasFocus); 935 } 936 } 937 938 /** 939 * {@inheritDoc} 940 */ 941 @Override 942 public void addTouchables(ArrayList<View> views) { 943 super.addTouchables(views); 944 945 final int count = mChildrenCount; 946 final View[] children = mChildren; 947 948 for (int i = 0; i < count; i++) { 949 final View child = children[i]; 950 if ((child.mViewFlags & VISIBILITY_MASK) == VISIBLE) { 951 child.addTouchables(views); 952 } 953 } 954 } 955 956 /** 957 * @hide 958 */ 959 @Override 960 public void makeOptionalFitsSystemWindows() { 961 super.makeOptionalFitsSystemWindows(); 962 final int count = mChildrenCount; 963 final View[] children = mChildren; 964 for (int i = 0; i < count; i++) { 965 children[i].makeOptionalFitsSystemWindows(); 966 } 967 } 968 969 /** 970 * {@inheritDoc} 971 */ 972 @Override 973 public void dispatchDisplayHint(int hint) { 974 super.dispatchDisplayHint(hint); 975 final int count = mChildrenCount; 976 final View[] children = mChildren; 977 for (int i = 0; i < count; i++) { 978 children[i].dispatchDisplayHint(hint); 979 } 980 } 981 982 /** 983 * Called when a view's visibility has changed. Notify the parent to take any appropriate 984 * action. 985 * 986 * @param child The view whose visibility has changed 987 * @param oldVisibility The previous visibility value (GONE, INVISIBLE, or VISIBLE). 988 * @param newVisibility The new visibility value (GONE, INVISIBLE, or VISIBLE). 989 * @hide 990 */ 991 protected void onChildVisibilityChanged(View child, int oldVisibility, int newVisibility) { 992 if (mTransition != null) { 993 if (newVisibility == VISIBLE) { 994 mTransition.showChild(this, child, oldVisibility); 995 } else { 996 mTransition.hideChild(this, child, newVisibility); 997 // Only track this on disappearing views - appearing views are already visible 998 // and don't need special handling during drawChild() 999 if (mVisibilityChangingChildren == null) { 1000 mVisibilityChangingChildren = new ArrayList<View>(); 1001 } 1002 mVisibilityChangingChildren.add(child); 1003 if (mTransitioningViews != null && mTransitioningViews.contains(child)) { 1004 addDisappearingView(child); 1005 } 1006 } 1007 } 1008 1009 // in all cases, for drags 1010 if (mCurrentDrag != null) { 1011 if (newVisibility == VISIBLE) { 1012 notifyChildOfDrag(child); 1013 } 1014 } 1015 } 1016 1017 /** 1018 * {@inheritDoc} 1019 */ 1020 @Override 1021 protected void dispatchVisibilityChanged(View changedView, int visibility) { 1022 super.dispatchVisibilityChanged(changedView, visibility); 1023 final int count = mChildrenCount; 1024 final View[] children = mChildren; 1025 for (int i = 0; i < count; i++) { 1026 children[i].dispatchVisibilityChanged(changedView, visibility); 1027 } 1028 } 1029 1030 /** 1031 * {@inheritDoc} 1032 */ 1033 @Override 1034 public void dispatchWindowVisibilityChanged(int visibility) { 1035 super.dispatchWindowVisibilityChanged(visibility); 1036 final int count = mChildrenCount; 1037 final View[] children = mChildren; 1038 for (int i = 0; i < count; i++) { 1039 children[i].dispatchWindowVisibilityChanged(visibility); 1040 } 1041 } 1042 1043 /** 1044 * {@inheritDoc} 1045 */ 1046 @Override 1047 public void dispatchConfigurationChanged(Configuration newConfig) { 1048 super.dispatchConfigurationChanged(newConfig); 1049 final int count = mChildrenCount; 1050 final View[] children = mChildren; 1051 for (int i = 0; i < count; i++) { 1052 children[i].dispatchConfigurationChanged(newConfig); 1053 } 1054 } 1055 1056 /** 1057 * {@inheritDoc} 1058 */ 1059 public void recomputeViewAttributes(View child) { 1060 if (mAttachInfo != null && !mAttachInfo.mRecomputeGlobalAttributes) { 1061 ViewParent parent = mParent; 1062 if (parent != null) parent.recomputeViewAttributes(this); 1063 } 1064 } 1065 1066 @Override 1067 void dispatchCollectViewAttributes(AttachInfo attachInfo, int visibility) { 1068 if ((visibility & VISIBILITY_MASK) == VISIBLE) { 1069 super.dispatchCollectViewAttributes(attachInfo, visibility); 1070 final int count = mChildrenCount; 1071 final View[] children = mChildren; 1072 for (int i = 0; i < count; i++) { 1073 final View child = children[i]; 1074 child.dispatchCollectViewAttributes(attachInfo, 1075 visibility | (child.mViewFlags&VISIBILITY_MASK)); 1076 } 1077 } 1078 } 1079 1080 /** 1081 * {@inheritDoc} 1082 */ 1083 public void bringChildToFront(View child) { 1084 int index = indexOfChild(child); 1085 if (index >= 0) { 1086 removeFromArray(index); 1087 addInArray(child, mChildrenCount); 1088 child.mParent = this; 1089 } 1090 } 1091 1092 /** 1093 * {@inheritDoc} 1094 */ 1095 // TODO: Write real docs 1096 @Override 1097 public boolean dispatchDragEvent(DragEvent event) { 1098 boolean retval = false; 1099 final float tx = event.mX; 1100 final float ty = event.mY; 1101 1102 ViewRootImpl root = getViewRootImpl(); 1103 1104 // Dispatch down the view hierarchy 1105 switch (event.mAction) { 1106 case DragEvent.ACTION_DRAG_STARTED: { 1107 // clear state to recalculate which views we drag over 1108 mCurrentDragView = null; 1109 1110 // Set up our tracking of drag-started notifications 1111 mCurrentDrag = DragEvent.obtain(event); 1112 if (mDragNotifiedChildren == null) { 1113 mDragNotifiedChildren = new HashSet<View>(); 1114 } else { 1115 mDragNotifiedChildren.clear(); 1116 } 1117 1118 // Now dispatch down to our children, caching the responses 1119 mChildAcceptsDrag = false; 1120 final int count = mChildrenCount; 1121 final View[] children = mChildren; 1122 for (int i = 0; i < count; i++) { 1123 final View child = children[i]; 1124 child.mPrivateFlags2 &= ~View.DRAG_MASK; 1125 if (child.getVisibility() == VISIBLE) { 1126 final boolean handled = notifyChildOfDrag(children[i]); 1127 if (handled) { 1128 mChildAcceptsDrag = true; 1129 } 1130 } 1131 } 1132 1133 // Return HANDLED if one of our children can accept the drag 1134 if (mChildAcceptsDrag) { 1135 retval = true; 1136 } 1137 } break; 1138 1139 case DragEvent.ACTION_DRAG_ENDED: { 1140 // Release the bookkeeping now that the drag lifecycle has ended 1141 if (mDragNotifiedChildren != null) { 1142 for (View child : mDragNotifiedChildren) { 1143 // If a child was notified about an ongoing drag, it's told that it's over 1144 child.dispatchDragEvent(event); 1145 child.mPrivateFlags2 &= ~View.DRAG_MASK; 1146 child.refreshDrawableState(); 1147 } 1148 1149 mDragNotifiedChildren.clear(); 1150 mCurrentDrag.recycle(); 1151 mCurrentDrag = null; 1152 } 1153 1154 // We consider drag-ended to have been handled if one of our children 1155 // had offered to handle the drag. 1156 if (mChildAcceptsDrag) { 1157 retval = true; 1158 } 1159 } break; 1160 1161 case DragEvent.ACTION_DRAG_LOCATION: { 1162 // Find the [possibly new] drag target 1163 final View target = findFrontmostDroppableChildAt(event.mX, event.mY, mLocalPoint); 1164 1165 // If we've changed apparent drag target, tell the view root which view 1166 // we're over now [for purposes of the eventual drag-recipient-changed 1167 // notifications to the framework] and tell the new target that the drag 1168 // has entered its bounds. The root will see setDragFocus() calls all 1169 // the way down to the final leaf view that is handling the LOCATION event 1170 // before reporting the new potential recipient to the framework. 1171 if (mCurrentDragView != target) { 1172 root.setDragFocus(target); 1173 1174 final int action = event.mAction; 1175 // If we've dragged off of a child view, send it the EXITED message 1176 if (mCurrentDragView != null) { 1177 final View view = mCurrentDragView; 1178 event.mAction = DragEvent.ACTION_DRAG_EXITED; 1179 view.dispatchDragEvent(event); 1180 view.mPrivateFlags2 &= ~View.DRAG_HOVERED; 1181 view.refreshDrawableState(); 1182 } 1183 mCurrentDragView = target; 1184 1185 // If we've dragged over a new child view, send it the ENTERED message 1186 if (target != null) { 1187 event.mAction = DragEvent.ACTION_DRAG_ENTERED; 1188 target.dispatchDragEvent(event); 1189 target.mPrivateFlags2 |= View.DRAG_HOVERED; 1190 target.refreshDrawableState(); 1191 } 1192 event.mAction = action; // restore the event's original state 1193 } 1194 1195 // Dispatch the actual drag location notice, localized into its coordinates 1196 if (target != null) { 1197 event.mX = mLocalPoint.x; 1198 event.mY = mLocalPoint.y; 1199 1200 retval = target.dispatchDragEvent(event); 1201 1202 event.mX = tx; 1203 event.mY = ty; 1204 } 1205 } break; 1206 1207 /* Entered / exited dispatch 1208 * 1209 * DRAG_ENTERED is not dispatched downwards from ViewGroup. The reason for this is 1210 * that we're about to get the corresponding LOCATION event, which we will use to 1211 * determine which of our children is the new target; at that point we will 1212 * push a DRAG_ENTERED down to the new target child [which may itself be a ViewGroup]. 1213 * 1214 * DRAG_EXITED *is* dispatched all the way down immediately: once we know the 1215 * drag has left this ViewGroup, we know by definition that every contained subview 1216 * is also no longer under the drag point. 1217 */ 1218 1219 case DragEvent.ACTION_DRAG_EXITED: { 1220 if (mCurrentDragView != null) { 1221 final View view = mCurrentDragView; 1222 view.dispatchDragEvent(event); 1223 view.mPrivateFlags2 &= ~View.DRAG_HOVERED; 1224 view.refreshDrawableState(); 1225 1226 mCurrentDragView = null; 1227 } 1228 } break; 1229 1230 case DragEvent.ACTION_DROP: { 1231 if (ViewDebug.DEBUG_DRAG) Log.d(View.VIEW_LOG_TAG, "Drop event: " + event); 1232 View target = findFrontmostDroppableChildAt(event.mX, event.mY, mLocalPoint); 1233 if (target != null) { 1234 if (ViewDebug.DEBUG_DRAG) Log.d(View.VIEW_LOG_TAG, " dispatch drop to " + target); 1235 event.mX = mLocalPoint.x; 1236 event.mY = mLocalPoint.y; 1237 retval = target.dispatchDragEvent(event); 1238 event.mX = tx; 1239 event.mY = ty; 1240 } else { 1241 if (ViewDebug.DEBUG_DRAG) { 1242 Log.d(View.VIEW_LOG_TAG, " not dropped on an accepting view"); 1243 } 1244 } 1245 } break; 1246 } 1247 1248 // If none of our children could handle the event, try here 1249 if (!retval) { 1250 // Call up to the View implementation that dispatches to installed listeners 1251 retval = super.dispatchDragEvent(event); 1252 } 1253 return retval; 1254 } 1255 1256 // Find the frontmost child view that lies under the given point, and calculate 1257 // the position within its own local coordinate system. 1258 View findFrontmostDroppableChildAt(float x, float y, PointF outLocalPoint) { 1259 final int count = mChildrenCount; 1260 final View[] children = mChildren; 1261 for (int i = count - 1; i >= 0; i--) { 1262 final View child = children[i]; 1263 if (!child.canAcceptDrag()) { 1264 continue; 1265 } 1266 1267 if (isTransformedTouchPointInView(x, y, child, outLocalPoint)) { 1268 return child; 1269 } 1270 } 1271 return null; 1272 } 1273 1274 boolean notifyChildOfDrag(View child) { 1275 if (ViewDebug.DEBUG_DRAG) { 1276 Log.d(View.VIEW_LOG_TAG, "Sending drag-started to view: " + child); 1277 } 1278 1279 boolean canAccept = false; 1280 if (! mDragNotifiedChildren.contains(child)) { 1281 mDragNotifiedChildren.add(child); 1282 canAccept = child.dispatchDragEvent(mCurrentDrag); 1283 if (canAccept && !child.canAcceptDrag()) { 1284 child.mPrivateFlags2 |= View.DRAG_CAN_ACCEPT; 1285 child.refreshDrawableState(); 1286 } 1287 } 1288 return canAccept; 1289 } 1290 1291 @Override 1292 public void dispatchWindowSystemUiVisiblityChanged(int visible) { 1293 super.dispatchWindowSystemUiVisiblityChanged(visible); 1294 1295 final int count = mChildrenCount; 1296 final View[] children = mChildren; 1297 for (int i=0; i <count; i++) { 1298 final View child = children[i]; 1299 child.dispatchWindowSystemUiVisiblityChanged(visible); 1300 } 1301 } 1302 1303 @Override 1304 public void dispatchSystemUiVisibilityChanged(int visible) { 1305 super.dispatchSystemUiVisibilityChanged(visible); 1306 1307 final int count = mChildrenCount; 1308 final View[] children = mChildren; 1309 for (int i=0; i <count; i++) { 1310 final View child = children[i]; 1311 child.dispatchSystemUiVisibilityChanged(visible); 1312 } 1313 } 1314 1315 @Override 1316 void updateLocalSystemUiVisibility(int localValue, int localChanges) { 1317 super.updateLocalSystemUiVisibility(localValue, localChanges); 1318 1319 final int count = mChildrenCount; 1320 final View[] children = mChildren; 1321 for (int i=0; i <count; i++) { 1322 final View child = children[i]; 1323 child.updateLocalSystemUiVisibility(localValue, localChanges); 1324 } 1325 } 1326 1327 /** 1328 * {@inheritDoc} 1329 */ 1330 @Override 1331 public boolean dispatchKeyEventPreIme(KeyEvent event) { 1332 if ((mPrivateFlags & (FOCUSED | HAS_BOUNDS)) == (FOCUSED | HAS_BOUNDS)) { 1333 return super.dispatchKeyEventPreIme(event); 1334 } else if (mFocused != null && (mFocused.mPrivateFlags & HAS_BOUNDS) == HAS_BOUNDS) { 1335 return mFocused.dispatchKeyEventPreIme(event); 1336 } 1337 return false; 1338 } 1339 1340 /** 1341 * {@inheritDoc} 1342 */ 1343 @Override 1344 public boolean dispatchKeyEvent(KeyEvent event) { 1345 if (mInputEventConsistencyVerifier != null) { 1346 mInputEventConsistencyVerifier.onKeyEvent(event, 1); 1347 } 1348 1349 if ((mPrivateFlags & (FOCUSED | HAS_BOUNDS)) == (FOCUSED | HAS_BOUNDS)) { 1350 if (super.dispatchKeyEvent(event)) { 1351 return true; 1352 } 1353 } else if (mFocused != null && (mFocused.mPrivateFlags & HAS_BOUNDS) == HAS_BOUNDS) { 1354 if (mFocused.dispatchKeyEvent(event)) { 1355 return true; 1356 } 1357 } 1358 1359 if (mInputEventConsistencyVerifier != null) { 1360 mInputEventConsistencyVerifier.onUnhandledEvent(event, 1); 1361 } 1362 return false; 1363 } 1364 1365 /** 1366 * {@inheritDoc} 1367 */ 1368 @Override 1369 public boolean dispatchKeyShortcutEvent(KeyEvent event) { 1370 if ((mPrivateFlags & (FOCUSED | HAS_BOUNDS)) == (FOCUSED | HAS_BOUNDS)) { 1371 return super.dispatchKeyShortcutEvent(event); 1372 } else if (mFocused != null && (mFocused.mPrivateFlags & HAS_BOUNDS) == HAS_BOUNDS) { 1373 return mFocused.dispatchKeyShortcutEvent(event); 1374 } 1375 return false; 1376 } 1377 1378 /** 1379 * {@inheritDoc} 1380 */ 1381 @Override 1382 public boolean dispatchTrackballEvent(MotionEvent event) { 1383 if (mInputEventConsistencyVerifier != null) { 1384 mInputEventConsistencyVerifier.onTrackballEvent(event, 1); 1385 } 1386 1387 if ((mPrivateFlags & (FOCUSED | HAS_BOUNDS)) == (FOCUSED | HAS_BOUNDS)) { 1388 if (super.dispatchTrackballEvent(event)) { 1389 return true; 1390 } 1391 } else if (mFocused != null && (mFocused.mPrivateFlags & HAS_BOUNDS) == HAS_BOUNDS) { 1392 if (mFocused.dispatchTrackballEvent(event)) { 1393 return true; 1394 } 1395 } 1396 1397 if (mInputEventConsistencyVerifier != null) { 1398 mInputEventConsistencyVerifier.onUnhandledEvent(event, 1); 1399 } 1400 return false; 1401 } 1402 1403 /** 1404 * {@inheritDoc} 1405 */ 1406 @SuppressWarnings({"ConstantConditions"}) 1407 @Override 1408 protected boolean dispatchHoverEvent(MotionEvent event) { 1409 final int action = event.getAction(); 1410 1411 // First check whether the view group wants to intercept the hover event. 1412 final boolean interceptHover = onInterceptHoverEvent(event); 1413 event.setAction(action); // restore action in case it was changed 1414 1415 MotionEvent eventNoHistory = event; 1416 boolean handled = false; 1417 1418 // Send events to the hovered children and build a new list of hover targets until 1419 // one is found that handles the event. 1420 HoverTarget firstOldHoverTarget = mFirstHoverTarget; 1421 mFirstHoverTarget = null; 1422 if (!interceptHover && action != MotionEvent.ACTION_HOVER_EXIT) { 1423 final float x = event.getX(); 1424 final float y = event.getY(); 1425 final int childrenCount = mChildrenCount; 1426 if (childrenCount != 0) { 1427 final View[] children = mChildren; 1428 HoverTarget lastHoverTarget = null; 1429 for (int i = childrenCount - 1; i >= 0; i--) { 1430 final View child = children[i]; 1431 if (!canViewReceivePointerEvents(child) 1432 || !isTransformedTouchPointInView(x, y, child, null)) { 1433 continue; 1434 } 1435 1436 // Obtain a hover target for this child. Dequeue it from the 1437 // old hover target list if the child was previously hovered. 1438 HoverTarget hoverTarget = firstOldHoverTarget; 1439 final boolean wasHovered; 1440 for (HoverTarget predecessor = null; ;) { 1441 if (hoverTarget == null) { 1442 hoverTarget = HoverTarget.obtain(child); 1443 wasHovered = false; 1444 break; 1445 } 1446 1447 if (hoverTarget.child == child) { 1448 if (predecessor != null) { 1449 predecessor.next = hoverTarget.next; 1450 } else { 1451 firstOldHoverTarget = hoverTarget.next; 1452 } 1453 hoverTarget.next = null; 1454 wasHovered = true; 1455 break; 1456 } 1457 1458 predecessor = hoverTarget; 1459 hoverTarget = hoverTarget.next; 1460 } 1461 1462 // Enqueue the hover target onto the new hover target list. 1463 if (lastHoverTarget != null) { 1464 lastHoverTarget.next = hoverTarget; 1465 } else { 1466 lastHoverTarget = hoverTarget; 1467 mFirstHoverTarget = hoverTarget; 1468 } 1469 1470 // Dispatch the event to the child. 1471 if (action == MotionEvent.ACTION_HOVER_ENTER) { 1472 if (!wasHovered) { 1473 // Send the enter as is. 1474 handled |= dispatchTransformedGenericPointerEvent( 1475 event, child); // enter 1476 } 1477 } else if (action == MotionEvent.ACTION_HOVER_MOVE) { 1478 if (!wasHovered) { 1479 // Synthesize an enter from a move. 1480 eventNoHistory = obtainMotionEventNoHistoryOrSelf(eventNoHistory); 1481 eventNoHistory.setAction(MotionEvent.ACTION_HOVER_ENTER); 1482 handled |= dispatchTransformedGenericPointerEvent( 1483 eventNoHistory, child); // enter 1484 eventNoHistory.setAction(action); 1485 1486 handled |= dispatchTransformedGenericPointerEvent( 1487 eventNoHistory, child); // move 1488 } else { 1489 // Send the move as is. 1490 handled |= dispatchTransformedGenericPointerEvent(event, child); 1491 } 1492 } 1493 if (handled) { 1494 break; 1495 } 1496 } 1497 } 1498 } 1499 1500 // Send exit events to all previously hovered children that are no longer hovered. 1501 while (firstOldHoverTarget != null) { 1502 final View child = firstOldHoverTarget.child; 1503 1504 // Exit the old hovered child. 1505 if (action == MotionEvent.ACTION_HOVER_EXIT) { 1506 // Send the exit as is. 1507 handled |= dispatchTransformedGenericPointerEvent( 1508 event, child); // exit 1509 } else { 1510 // Synthesize an exit from a move or enter. 1511 // Ignore the result because hover focus has moved to a different view. 1512 if (action == MotionEvent.ACTION_HOVER_MOVE) { 1513 dispatchTransformedGenericPointerEvent( 1514 event, child); // move 1515 } 1516 eventNoHistory = obtainMotionEventNoHistoryOrSelf(eventNoHistory); 1517 eventNoHistory.setAction(MotionEvent.ACTION_HOVER_EXIT); 1518 dispatchTransformedGenericPointerEvent( 1519 eventNoHistory, child); // exit 1520 eventNoHistory.setAction(action); 1521 } 1522 1523 final HoverTarget nextOldHoverTarget = firstOldHoverTarget.next; 1524 firstOldHoverTarget.recycle(); 1525 firstOldHoverTarget = nextOldHoverTarget; 1526 } 1527 1528 // Send events to the view group itself if no children have handled it. 1529 boolean newHoveredSelf = !handled; 1530 if (newHoveredSelf == mHoveredSelf) { 1531 if (newHoveredSelf) { 1532 // Send event to the view group as before. 1533 handled |= super.dispatchHoverEvent(event); 1534 } 1535 } else { 1536 if (mHoveredSelf) { 1537 // Exit the view group. 1538 if (action == MotionEvent.ACTION_HOVER_EXIT) { 1539 // Send the exit as is. 1540 handled |= super.dispatchHoverEvent(event); // exit 1541 } else { 1542 // Synthesize an exit from a move or enter. 1543 // Ignore the result because hover focus is moving to a different view. 1544 if (action == MotionEvent.ACTION_HOVER_MOVE) { 1545 super.dispatchHoverEvent(event); // move 1546 } 1547 eventNoHistory = obtainMotionEventNoHistoryOrSelf(eventNoHistory); 1548 eventNoHistory.setAction(MotionEvent.ACTION_HOVER_EXIT); 1549 super.dispatchHoverEvent(eventNoHistory); // exit 1550 eventNoHistory.setAction(action); 1551 } 1552 mHoveredSelf = false; 1553 } 1554 1555 if (newHoveredSelf) { 1556 // Enter the view group. 1557 if (action == MotionEvent.ACTION_HOVER_ENTER) { 1558 // Send the enter as is. 1559 handled |= super.dispatchHoverEvent(event); // enter 1560 mHoveredSelf = true; 1561 } else if (action == MotionEvent.ACTION_HOVER_MOVE) { 1562 // Synthesize an enter from a move. 1563 eventNoHistory = obtainMotionEventNoHistoryOrSelf(eventNoHistory); 1564 eventNoHistory.setAction(MotionEvent.ACTION_HOVER_ENTER); 1565 handled |= super.dispatchHoverEvent(eventNoHistory); // enter 1566 eventNoHistory.setAction(action); 1567 1568 handled |= super.dispatchHoverEvent(eventNoHistory); // move 1569 mHoveredSelf = true; 1570 } 1571 } 1572 } 1573 1574 // Recycle the copy of the event that we made. 1575 if (eventNoHistory != event) { 1576 eventNoHistory.recycle(); 1577 } 1578 1579 // Done. 1580 return handled; 1581 } 1582 1583 private void exitHoverTargets() { 1584 if (mHoveredSelf || mFirstHoverTarget != null) { 1585 final long now = SystemClock.uptimeMillis(); 1586 MotionEvent event = MotionEvent.obtain(now, now, 1587 MotionEvent.ACTION_HOVER_EXIT, 0.0f, 0.0f, 0); 1588 event.setSource(InputDevice.SOURCE_TOUCHSCREEN); 1589 dispatchHoverEvent(event); 1590 event.recycle(); 1591 } 1592 } 1593 1594 private void cancelHoverTarget(View view) { 1595 HoverTarget predecessor = null; 1596 HoverTarget target = mFirstHoverTarget; 1597 while (target != null) { 1598 final HoverTarget next = target.next; 1599 if (target.child == view) { 1600 if (predecessor == null) { 1601 mFirstHoverTarget = next; 1602 } else { 1603 predecessor.next = next; 1604 } 1605 target.recycle(); 1606 1607 final long now = SystemClock.uptimeMillis(); 1608 MotionEvent event = MotionEvent.obtain(now, now, 1609 MotionEvent.ACTION_HOVER_EXIT, 0.0f, 0.0f, 0); 1610 event.setSource(InputDevice.SOURCE_TOUCHSCREEN); 1611 view.dispatchHoverEvent(event); 1612 event.recycle(); 1613 return; 1614 } 1615 predecessor = target; 1616 target = next; 1617 } 1618 } 1619 1620 /** @hide */ 1621 @Override 1622 protected boolean hasHoveredChild() { 1623 return mFirstHoverTarget != null; 1624 } 1625 1626 @Override 1627 public void addChildrenForAccessibility(ArrayList<View> childrenForAccessibility) { 1628 ChildListForAccessibility children = ChildListForAccessibility.obtain(this, true); 1629 try { 1630 final int childrenCount = children.getChildCount(); 1631 for (int i = 0; i < childrenCount; i++) { 1632 View child = children.getChildAt(i); 1633 if ((child.mViewFlags & VISIBILITY_MASK) == VISIBLE 1634 && (child.mPrivateFlags & IS_ROOT_NAMESPACE) == 0) { 1635 if (child.includeForAccessibility()) { 1636 childrenForAccessibility.add(child); 1637 } else { 1638 child.addChildrenForAccessibility(childrenForAccessibility); 1639 } 1640 } 1641 } 1642 } finally { 1643 children.recycle(); 1644 } 1645 } 1646 1647 /** 1648 * @hide 1649 */ 1650 @Override 1651 public void childAccessibilityStateChanged(View child) { 1652 if (mParent != null) { 1653 mParent.childAccessibilityStateChanged(child); 1654 } 1655 } 1656 1657 /** 1658 * Implement this method to intercept hover events before they are handled 1659 * by child views. 1660 * <p> 1661 * This method is called before dispatching a hover event to a child of 1662 * the view group or to the view group's own {@link #onHoverEvent} to allow 1663 * the view group a chance to intercept the hover event. 1664 * This method can also be used to watch all pointer motions that occur within 1665 * the bounds of the view group even when the pointer is hovering over 1666 * a child of the view group rather than over the view group itself. 1667 * </p><p> 1668 * The view group can prevent its children from receiving hover events by 1669 * implementing this method and returning <code>true</code> to indicate 1670 * that it would like to intercept hover events. The view group must 1671 * continuously return <code>true</code> from {@link #onInterceptHoverEvent} 1672 * for as long as it wishes to continue intercepting hover events from 1673 * its children. 1674 * </p><p> 1675 * Interception preserves the invariant that at most one view can be 1676 * hovered at a time by transferring hover focus from the currently hovered 1677 * child to the view group or vice-versa as needed. 1678 * </p><p> 1679 * If this method returns <code>true</code> and a child is already hovered, then the 1680 * child view will first receive a hover exit event and then the view group 1681 * itself will receive a hover enter event in {@link #onHoverEvent}. 1682 * Likewise, if this method had previously returned <code>true</code> to intercept hover 1683 * events and instead returns <code>false</code> while the pointer is hovering 1684 * within the bounds of one of a child, then the view group will first receive a 1685 * hover exit event in {@link #onHoverEvent} and then the hovered child will 1686 * receive a hover enter event. 1687 * </p><p> 1688 * The default implementation always returns false. 1689 * </p> 1690 * 1691 * @param event The motion event that describes the hover. 1692 * @return True if the view group would like to intercept the hover event 1693 * and prevent its children from receiving it. 1694 */ 1695 public boolean onInterceptHoverEvent(MotionEvent event) { 1696 return false; 1697 } 1698 1699 private static MotionEvent obtainMotionEventNoHistoryOrSelf(MotionEvent event) { 1700 if (event.getHistorySize() == 0) { 1701 return event; 1702 } 1703 return MotionEvent.obtainNoHistory(event); 1704 } 1705 1706 /** 1707 * {@inheritDoc} 1708 */ 1709 @Override 1710 protected boolean dispatchGenericPointerEvent(MotionEvent event) { 1711 // Send the event to the child under the pointer. 1712 final int childrenCount = mChildrenCount; 1713 if (childrenCount != 0) { 1714 final View[] children = mChildren; 1715 final float x = event.getX(); 1716 final float y = event.getY(); 1717 1718 for (int i = childrenCount - 1; i >= 0; i--) { 1719 final View child = children[i]; 1720 if (!canViewReceivePointerEvents(child) 1721 || !isTransformedTouchPointInView(x, y, child, null)) { 1722 continue; 1723 } 1724 1725 if (dispatchTransformedGenericPointerEvent(event, child)) { 1726 return true; 1727 } 1728 } 1729 } 1730 1731 // No child handled the event. Send it to this view group. 1732 return super.dispatchGenericPointerEvent(event); 1733 } 1734 1735 /** 1736 * {@inheritDoc} 1737 */ 1738 @Override 1739 protected boolean dispatchGenericFocusedEvent(MotionEvent event) { 1740 // Send the event to the focused child or to this view group if it has focus. 1741 if ((mPrivateFlags & (FOCUSED | HAS_BOUNDS)) == (FOCUSED | HAS_BOUNDS)) { 1742 return super.dispatchGenericFocusedEvent(event); 1743 } else if (mFocused != null && (mFocused.mPrivateFlags & HAS_BOUNDS) == HAS_BOUNDS) { 1744 return mFocused.dispatchGenericMotionEvent(event); 1745 } 1746 return false; 1747 } 1748 1749 /** 1750 * Dispatches a generic pointer event to a child, taking into account 1751 * transformations that apply to the child. 1752 * 1753 * @param event The event to send. 1754 * @param child The view to send the event to. 1755 * @return {@code true} if the child handled the event. 1756 */ 1757 private boolean dispatchTransformedGenericPointerEvent(MotionEvent event, View child) { 1758 final float offsetX = mScrollX - child.mLeft; 1759 final float offsetY = mScrollY - child.mTop; 1760 1761 boolean handled; 1762 if (!child.hasIdentityMatrix()) { 1763 MotionEvent transformedEvent = MotionEvent.obtain(event); 1764 transformedEvent.offsetLocation(offsetX, offsetY); 1765 transformedEvent.transform(child.getInverseMatrix()); 1766 handled = child.dispatchGenericMotionEvent(transformedEvent); 1767 transformedEvent.recycle(); 1768 } else { 1769 event.offsetLocation(offsetX, offsetY); 1770 handled = child.dispatchGenericMotionEvent(event); 1771 event.offsetLocation(-offsetX, -offsetY); 1772 } 1773 return handled; 1774 } 1775 1776 /** 1777 * {@inheritDoc} 1778 */ 1779 @Override 1780 public boolean dispatchTouchEvent(MotionEvent ev) { 1781 if (mInputEventConsistencyVerifier != null) { 1782 mInputEventConsistencyVerifier.onTouchEvent(ev, 1); 1783 } 1784 1785 boolean handled = false; 1786 if (onFilterTouchEventForSecurity(ev)) { 1787 final int action = ev.getAction(); 1788 final int actionMasked = action & MotionEvent.ACTION_MASK; 1789 1790 // Handle an initial down. 1791 if (actionMasked == MotionEvent.ACTION_DOWN) { 1792 // Throw away all previous state when starting a new touch gesture. 1793 // The framework may have dropped the up or cancel event for the previous gesture 1794 // due to an app switch, ANR, or some other state change. 1795 cancelAndClearTouchTargets(ev); 1796 resetTouchState(); 1797 } 1798 1799 // Check for interception. 1800 final boolean intercepted; 1801 if (actionMasked == MotionEvent.ACTION_DOWN 1802 || mFirstTouchTarget != null) { 1803 final boolean disallowIntercept = (mGroupFlags & FLAG_DISALLOW_INTERCEPT) != 0; 1804 if (!disallowIntercept) { 1805 intercepted = onInterceptTouchEvent(ev); 1806 ev.setAction(action); // restore action in case it was changed 1807 } else { 1808 intercepted = false; 1809 } 1810 } else { 1811 // There are no touch targets and this action is not an initial down 1812 // so this view group continues to intercept touches. 1813 intercepted = true; 1814 } 1815 1816 // Check for cancelation. 1817 final boolean canceled = resetCancelNextUpFlag(this) 1818 || actionMasked == MotionEvent.ACTION_CANCEL; 1819 1820 // Update list of touch targets for pointer down, if needed. 1821 final boolean split = (mGroupFlags & FLAG_SPLIT_MOTION_EVENTS) != 0; 1822 TouchTarget newTouchTarget = null; 1823 boolean alreadyDispatchedToNewTouchTarget = false; 1824 if (!canceled && !intercepted) { 1825 if (actionMasked == MotionEvent.ACTION_DOWN 1826 || (split && actionMasked == MotionEvent.ACTION_POINTER_DOWN) 1827 || actionMasked == MotionEvent.ACTION_HOVER_MOVE) { 1828 final int actionIndex = ev.getActionIndex(); // always 0 for down 1829 final int idBitsToAssign = split ? 1 << ev.getPointerId(actionIndex) 1830 : TouchTarget.ALL_POINTER_IDS; 1831 1832 // Clean up earlier touch targets for this pointer id in case they 1833 // have become out of sync. 1834 removePointersFromTouchTargets(idBitsToAssign); 1835 1836 final int childrenCount = mChildrenCount; 1837 if (childrenCount != 0) { 1838 // Find a child that can receive the event. 1839 // Scan children from front to back. 1840 final View[] children = mChildren; 1841 final float x = ev.getX(actionIndex); 1842 final float y = ev.getY(actionIndex); 1843 1844 for (int i = childrenCount - 1; i >= 0; i--) { 1845 final View child = children[i]; 1846 if (!canViewReceivePointerEvents(child) 1847 || !isTransformedTouchPointInView(x, y, child, null)) { 1848 continue; 1849 } 1850 1851 newTouchTarget = getTouchTarget(child); 1852 if (newTouchTarget != null) { 1853 // Child is already receiving touch within its bounds. 1854 // Give it the new pointer in addition to the ones it is handling. 1855 newTouchTarget.pointerIdBits |= idBitsToAssign; 1856 break; 1857 } 1858 1859 resetCancelNextUpFlag(child); 1860 if (dispatchTransformedTouchEvent(ev, false, child, idBitsToAssign)) { 1861 // Child wants to receive touch within its bounds. 1862 mLastTouchDownTime = ev.getDownTime(); 1863 mLastTouchDownIndex = i; 1864 mLastTouchDownX = ev.getX(); 1865 mLastTouchDownY = ev.getY(); 1866 newTouchTarget = addTouchTarget(child, idBitsToAssign); 1867 alreadyDispatchedToNewTouchTarget = true; 1868 break; 1869 } 1870 } 1871 } 1872 1873 if (newTouchTarget == null && mFirstTouchTarget != null) { 1874 // Did not find a child to receive the event. 1875 // Assign the pointer to the least recently added target. 1876 newTouchTarget = mFirstTouchTarget; 1877 while (newTouchTarget.next != null) { 1878 newTouchTarget = newTouchTarget.next; 1879 } 1880 newTouchTarget.pointerIdBits |= idBitsToAssign; 1881 } 1882 } 1883 } 1884 1885 // Dispatch to touch targets. 1886 if (mFirstTouchTarget == null) { 1887 // No touch targets so treat this as an ordinary view. 1888 handled = dispatchTransformedTouchEvent(ev, canceled, null, 1889 TouchTarget.ALL_POINTER_IDS); 1890 } else { 1891 // Dispatch to touch targets, excluding the new touch target if we already 1892 // dispatched to it. Cancel touch targets if necessary. 1893 TouchTarget predecessor = null; 1894 TouchTarget target = mFirstTouchTarget; 1895 while (target != null) { 1896 final TouchTarget next = target.next; 1897 if (alreadyDispatchedToNewTouchTarget && target == newTouchTarget) { 1898 handled = true; 1899 } else { 1900 final boolean cancelChild = resetCancelNextUpFlag(target.child) 1901 || intercepted; 1902 if (dispatchTransformedTouchEvent(ev, cancelChild, 1903 target.child, target.pointerIdBits)) { 1904 handled = true; 1905 } 1906 if (cancelChild) { 1907 if (predecessor == null) { 1908 mFirstTouchTarget = next; 1909 } else { 1910 predecessor.next = next; 1911 } 1912 target.recycle(); 1913 target = next; 1914 continue; 1915 } 1916 } 1917 predecessor = target; 1918 target = next; 1919 } 1920 } 1921 1922 // Update list of touch targets for pointer up or cancel, if needed. 1923 if (canceled 1924 || actionMasked == MotionEvent.ACTION_UP 1925 || actionMasked == MotionEvent.ACTION_HOVER_MOVE) { 1926 resetTouchState(); 1927 } else if (split && actionMasked == MotionEvent.ACTION_POINTER_UP) { 1928 final int actionIndex = ev.getActionIndex(); 1929 final int idBitsToRemove = 1 << ev.getPointerId(actionIndex); 1930 removePointersFromTouchTargets(idBitsToRemove); 1931 } 1932 } 1933 1934 if (!handled && mInputEventConsistencyVerifier != null) { 1935 mInputEventConsistencyVerifier.onUnhandledEvent(ev, 1); 1936 } 1937 return handled; 1938 } 1939 1940 /** 1941 * Resets all touch state in preparation for a new cycle. 1942 */ 1943 private void resetTouchState() { 1944 clearTouchTargets(); 1945 resetCancelNextUpFlag(this); 1946 mGroupFlags &= ~FLAG_DISALLOW_INTERCEPT; 1947 } 1948 1949 /** 1950 * Resets the cancel next up flag. 1951 * Returns true if the flag was previously set. 1952 */ 1953 private static boolean resetCancelNextUpFlag(View view) { 1954 if ((view.mPrivateFlags & CANCEL_NEXT_UP_EVENT) != 0) { 1955 view.mPrivateFlags &= ~CANCEL_NEXT_UP_EVENT; 1956 return true; 1957 } 1958 return false; 1959 } 1960 1961 /** 1962 * Clears all touch targets. 1963 */ 1964 private void clearTouchTargets() { 1965 TouchTarget target = mFirstTouchTarget; 1966 if (target != null) { 1967 do { 1968 TouchTarget next = target.next; 1969 target.recycle(); 1970 target = next; 1971 } while (target != null); 1972 mFirstTouchTarget = null; 1973 } 1974 } 1975 1976 /** 1977 * Cancels and clears all touch targets. 1978 */ 1979 private void cancelAndClearTouchTargets(MotionEvent event) { 1980 if (mFirstTouchTarget != null) { 1981 boolean syntheticEvent = false; 1982 if (event == null) { 1983 final long now = SystemClock.uptimeMillis(); 1984 event = MotionEvent.obtain(now, now, 1985 MotionEvent.ACTION_CANCEL, 0.0f, 0.0f, 0); 1986 event.setSource(InputDevice.SOURCE_TOUCHSCREEN); 1987 syntheticEvent = true; 1988 } 1989 1990 for (TouchTarget target = mFirstTouchTarget; target != null; target = target.next) { 1991 resetCancelNextUpFlag(target.child); 1992 dispatchTransformedTouchEvent(event, true, target.child, target.pointerIdBits); 1993 } 1994 clearTouchTargets(); 1995 1996 if (syntheticEvent) { 1997 event.recycle(); 1998 } 1999 } 2000 } 2001 2002 /** 2003 * Gets the touch target for specified child view. 2004 * Returns null if not found. 2005 */ 2006 private TouchTarget getTouchTarget(View child) { 2007 for (TouchTarget target = mFirstTouchTarget; target != null; target = target.next) { 2008 if (target.child == child) { 2009 return target; 2010 } 2011 } 2012 return null; 2013 } 2014 2015 /** 2016 * Adds a touch target for specified child to the beginning of the list. 2017 * Assumes the target child is not already present. 2018 */ 2019 private TouchTarget addTouchTarget(View child, int pointerIdBits) { 2020 TouchTarget target = TouchTarget.obtain(child, pointerIdBits); 2021 target.next = mFirstTouchTarget; 2022 mFirstTouchTarget = target; 2023 return target; 2024 } 2025 2026 /** 2027 * Removes the pointer ids from consideration. 2028 */ 2029 private void removePointersFromTouchTargets(int pointerIdBits) { 2030 TouchTarget predecessor = null; 2031 TouchTarget target = mFirstTouchTarget; 2032 while (target != null) { 2033 final TouchTarget next = target.next; 2034 if ((target.pointerIdBits & pointerIdBits) != 0) { 2035 target.pointerIdBits &= ~pointerIdBits; 2036 if (target.pointerIdBits == 0) { 2037 if (predecessor == null) { 2038 mFirstTouchTarget = next; 2039 } else { 2040 predecessor.next = next; 2041 } 2042 target.recycle(); 2043 target = next; 2044 continue; 2045 } 2046 } 2047 predecessor = target; 2048 target = next; 2049 } 2050 } 2051 2052 private void cancelTouchTarget(View view) { 2053 TouchTarget predecessor = null; 2054 TouchTarget target = mFirstTouchTarget; 2055 while (target != null) { 2056 final TouchTarget next = target.next; 2057 if (target.child == view) { 2058 if (predecessor == null) { 2059 mFirstTouchTarget = next; 2060 } else { 2061 predecessor.next = next; 2062 } 2063 target.recycle(); 2064 2065 final long now = SystemClock.uptimeMillis(); 2066 MotionEvent event = MotionEvent.obtain(now, now, 2067 MotionEvent.ACTION_CANCEL, 0.0f, 0.0f, 0); 2068 event.setSource(InputDevice.SOURCE_TOUCHSCREEN); 2069 view.dispatchTouchEvent(event); 2070 event.recycle(); 2071 return; 2072 } 2073 predecessor = target; 2074 target = next; 2075 } 2076 } 2077 2078 /** 2079 * Returns true if a child view can receive pointer events. 2080 * @hide 2081 */ 2082 private static boolean canViewReceivePointerEvents(View child) { 2083 return (child.mViewFlags & VISIBILITY_MASK) == VISIBLE 2084 || child.getAnimation() != null; 2085 } 2086 2087 /** 2088 * Returns true if a child view contains the specified point when transformed 2089 * into its coordinate space. 2090 * Child must not be null. 2091 * @hide 2092 */ 2093 protected boolean isTransformedTouchPointInView(float x, float y, View child, 2094 PointF outLocalPoint) { 2095 float localX = x + mScrollX - child.mLeft; 2096 float localY = y + mScrollY - child.mTop; 2097 if (! child.hasIdentityMatrix() && mAttachInfo != null) { 2098 final float[] localXY = mAttachInfo.mTmpTransformLocation; 2099 localXY[0] = localX; 2100 localXY[1] = localY; 2101 child.getInverseMatrix().mapPoints(localXY); 2102 localX = localXY[0]; 2103 localY = localXY[1]; 2104 } 2105 final boolean isInView = child.pointInView(localX, localY); 2106 if (isInView && outLocalPoint != null) { 2107 outLocalPoint.set(localX, localY); 2108 } 2109 return isInView; 2110 } 2111 2112 /** 2113 * Transforms a motion event into the coordinate space of a particular child view, 2114 * filters out irrelevant pointer ids, and overrides its action if necessary. 2115 * If child is null, assumes the MotionEvent will be sent to this ViewGroup instead. 2116 */ 2117 private boolean dispatchTransformedTouchEvent(MotionEvent event, boolean cancel, 2118 View child, int desiredPointerIdBits) { 2119 final boolean handled; 2120 2121 // Canceling motions is a special case. We don't need to perform any transformations 2122 // or filtering. The important part is the action, not the contents. 2123 final int oldAction = event.getAction(); 2124 if (cancel || oldAction == MotionEvent.ACTION_CANCEL) { 2125 event.setAction(MotionEvent.ACTION_CANCEL); 2126 if (child == null) { 2127 handled = super.dispatchTouchEvent(event); 2128 } else { 2129 handled = child.dispatchTouchEvent(event); 2130 } 2131 event.setAction(oldAction); 2132 return handled; 2133 } 2134 2135 // Calculate the number of pointers to deliver. 2136 final int oldPointerIdBits = event.getPointerIdBits(); 2137 final int newPointerIdBits = oldPointerIdBits & desiredPointerIdBits; 2138 2139 // If for some reason we ended up in an inconsistent state where it looks like we 2140 // might produce a motion event with no pointers in it, then drop the event. 2141 if (newPointerIdBits == 0) { 2142 return false; 2143 } 2144 2145 // If the number of pointers is the same and we don't need to perform any fancy 2146 // irreversible transformations, then we can reuse the motion event for this 2147 // dispatch as long as we are careful to revert any changes we make. 2148 // Otherwise we need to make a copy. 2149 final MotionEvent transformedEvent; 2150 if (newPointerIdBits == oldPointerIdBits) { 2151 if (child == null || child.hasIdentityMatrix()) { 2152 if (child == null) { 2153 handled = super.dispatchTouchEvent(event); 2154 } else { 2155 final float offsetX = mScrollX - child.mLeft; 2156 final float offsetY = mScrollY - child.mTop; 2157 event.offsetLocation(offsetX, offsetY); 2158 2159 handled = child.dispatchTouchEvent(event); 2160 2161 event.offsetLocation(-offsetX, -offsetY); 2162 } 2163 return handled; 2164 } 2165 transformedEvent = MotionEvent.obtain(event); 2166 } else { 2167 transformedEvent = event.split(newPointerIdBits); 2168 } 2169 2170 // Perform any necessary transformations and dispatch. 2171 if (child == null) { 2172 handled = super.dispatchTouchEvent(transformedEvent); 2173 } else { 2174 final float offsetX = mScrollX - child.mLeft; 2175 final float offsetY = mScrollY - child.mTop; 2176 transformedEvent.offsetLocation(offsetX, offsetY); 2177 if (! child.hasIdentityMatrix()) { 2178 transformedEvent.transform(child.getInverseMatrix()); 2179 } 2180 2181 handled = child.dispatchTouchEvent(transformedEvent); 2182 } 2183 2184 // Done. 2185 transformedEvent.recycle(); 2186 return handled; 2187 } 2188 2189 /** 2190 * Enable or disable the splitting of MotionEvents to multiple children during touch event 2191 * dispatch. This behavior is enabled by default for applications that target an 2192 * SDK version of {@link Build.VERSION_CODES#HONEYCOMB} or newer. 2193 * 2194 * <p>When this option is enabled MotionEvents may be split and dispatched to different child 2195 * views depending on where each pointer initially went down. This allows for user interactions 2196 * such as scrolling two panes of content independently, chording of buttons, and performing 2197 * independent gestures on different pieces of content. 2198 * 2199 * @param split <code>true</code> to allow MotionEvents to be split and dispatched to multiple 2200 * child views. <code>false</code> to only allow one child view to be the target of 2201 * any MotionEvent received by this ViewGroup. 2202 */ 2203 public void setMotionEventSplittingEnabled(boolean split) { 2204 // TODO Applications really shouldn't change this setting mid-touch event, 2205 // but perhaps this should handle that case and send ACTION_CANCELs to any child views 2206 // with gestures in progress when this is changed. 2207 if (split) { 2208 mGroupFlags |= FLAG_SPLIT_MOTION_EVENTS; 2209 } else { 2210 mGroupFlags &= ~FLAG_SPLIT_MOTION_EVENTS; 2211 } 2212 } 2213 2214 /** 2215 * Returns true if MotionEvents dispatched to this ViewGroup can be split to multiple children. 2216 * @return true if MotionEvents dispatched to this ViewGroup can be split to multiple children. 2217 */ 2218 public boolean isMotionEventSplittingEnabled() { 2219 return (mGroupFlags & FLAG_SPLIT_MOTION_EVENTS) == FLAG_SPLIT_MOTION_EVENTS; 2220 } 2221 2222 /** 2223 * {@inheritDoc} 2224 */ 2225 public void requestDisallowInterceptTouchEvent(boolean disallowIntercept) { 2226 2227 if (disallowIntercept == ((mGroupFlags & FLAG_DISALLOW_INTERCEPT) != 0)) { 2228 // We're already in this state, assume our ancestors are too 2229 return; 2230 } 2231 2232 if (disallowIntercept) { 2233 mGroupFlags |= FLAG_DISALLOW_INTERCEPT; 2234 } else { 2235 mGroupFlags &= ~FLAG_DISALLOW_INTERCEPT; 2236 } 2237 2238 // Pass it up to our parent 2239 if (mParent != null) { 2240 mParent.requestDisallowInterceptTouchEvent(disallowIntercept); 2241 } 2242 } 2243 2244 /** 2245 * Implement this method to intercept all touch screen motion events. This 2246 * allows you to watch events as they are dispatched to your children, and 2247 * take ownership of the current gesture at any point. 2248 * 2249 * <p>Using this function takes some care, as it has a fairly complicated 2250 * interaction with {@link View#onTouchEvent(MotionEvent) 2251 * View.onTouchEvent(MotionEvent)}, and using it requires implementing 2252 * that method as well as this one in the correct way. Events will be 2253 * received in the following order: 2254 * 2255 * <ol> 2256 * <li> You will receive the down event here. 2257 * <li> The down event will be handled either by a child of this view 2258 * group, or given to your own onTouchEvent() method to handle; this means 2259 * you should implement onTouchEvent() to return true, so you will 2260 * continue to see the rest of the gesture (instead of looking for 2261 * a parent view to handle it). Also, by returning true from 2262 * onTouchEvent(), you will not receive any following 2263 * events in onInterceptTouchEvent() and all touch processing must 2264 * happen in onTouchEvent() like normal. 2265 * <li> For as long as you return false from this function, each following 2266 * event (up to and including the final up) will be delivered first here 2267 * and then to the target's onTouchEvent(). 2268 * <li> If you return true from here, you will not receive any 2269 * following events: the target view will receive the same event but 2270 * with the action {@link MotionEvent#ACTION_CANCEL}, and all further 2271 * events will be delivered to your onTouchEvent() method and no longer 2272 * appear here. 2273 * </ol> 2274 * 2275 * @param ev The motion event being dispatched down the hierarchy. 2276 * @return Return true to steal motion events from the children and have 2277 * them dispatched to this ViewGroup through onTouchEvent(). 2278 * The current target will receive an ACTION_CANCEL event, and no further 2279 * messages will be delivered here. 2280 */ 2281 public boolean onInterceptTouchEvent(MotionEvent ev) { 2282 return false; 2283 } 2284 2285 /** 2286 * {@inheritDoc} 2287 * 2288 * Looks for a view to give focus to respecting the setting specified by 2289 * {@link #getDescendantFocusability()}. 2290 * 2291 * Uses {@link #onRequestFocusInDescendants(int, android.graphics.Rect)} to 2292 * find focus within the children of this group when appropriate. 2293 * 2294 * @see #FOCUS_BEFORE_DESCENDANTS 2295 * @see #FOCUS_AFTER_DESCENDANTS 2296 * @see #FOCUS_BLOCK_DESCENDANTS 2297 * @see #onRequestFocusInDescendants(int, android.graphics.Rect) 2298 */ 2299 @Override 2300 public boolean requestFocus(int direction, Rect previouslyFocusedRect) { 2301 if (DBG) { 2302 System.out.println(this + " ViewGroup.requestFocus direction=" 2303 + direction); 2304 } 2305 int descendantFocusability = getDescendantFocusability(); 2306 2307 switch (descendantFocusability) { 2308 case FOCUS_BLOCK_DESCENDANTS: 2309 return super.requestFocus(direction, previouslyFocusedRect); 2310 case FOCUS_BEFORE_DESCENDANTS: { 2311 final boolean took = super.requestFocus(direction, previouslyFocusedRect); 2312 return took ? took : onRequestFocusInDescendants(direction, previouslyFocusedRect); 2313 } 2314 case FOCUS_AFTER_DESCENDANTS: { 2315 final boolean took = onRequestFocusInDescendants(direction, previouslyFocusedRect); 2316 return took ? took : super.requestFocus(direction, previouslyFocusedRect); 2317 } 2318 default: 2319 throw new IllegalStateException("descendant focusability must be " 2320 + "one of FOCUS_BEFORE_DESCENDANTS, FOCUS_AFTER_DESCENDANTS, FOCUS_BLOCK_DESCENDANTS " 2321 + "but is " + descendantFocusability); 2322 } 2323 } 2324 2325 /** 2326 * Look for a descendant to call {@link View#requestFocus} on. 2327 * Called by {@link ViewGroup#requestFocus(int, android.graphics.Rect)} 2328 * when it wants to request focus within its children. Override this to 2329 * customize how your {@link ViewGroup} requests focus within its children. 2330 * @param direction One of FOCUS_UP, FOCUS_DOWN, FOCUS_LEFT, and FOCUS_RIGHT 2331 * @param previouslyFocusedRect The rectangle (in this View's coordinate system) 2332 * to give a finer grained hint about where focus is coming from. May be null 2333 * if there is no hint. 2334 * @return Whether focus was taken. 2335 */ 2336 @SuppressWarnings({"ConstantConditions"}) 2337 protected boolean onRequestFocusInDescendants(int direction, 2338 Rect previouslyFocusedRect) { 2339 int index; 2340 int increment; 2341 int end; 2342 int count = mChildrenCount; 2343 if ((direction & FOCUS_FORWARD) != 0) { 2344 index = 0; 2345 increment = 1; 2346 end = count; 2347 } else { 2348 index = count - 1; 2349 increment = -1; 2350 end = -1; 2351 } 2352 final View[] children = mChildren; 2353 for (int i = index; i != end; i += increment) { 2354 View child = children[i]; 2355 if ((child.mViewFlags & VISIBILITY_MASK) == VISIBLE) { 2356 if (child.requestFocus(direction, previouslyFocusedRect)) { 2357 return true; 2358 } 2359 } 2360 } 2361 return false; 2362 } 2363 2364 /** 2365 * {@inheritDoc} 2366 * 2367 * @hide 2368 */ 2369 @Override 2370 public void dispatchStartTemporaryDetach() { 2371 super.dispatchStartTemporaryDetach(); 2372 final int count = mChildrenCount; 2373 final View[] children = mChildren; 2374 for (int i = 0; i < count; i++) { 2375 children[i].dispatchStartTemporaryDetach(); 2376 } 2377 } 2378 2379 /** 2380 * {@inheritDoc} 2381 * 2382 * @hide 2383 */ 2384 @Override 2385 public void dispatchFinishTemporaryDetach() { 2386 super.dispatchFinishTemporaryDetach(); 2387 final int count = mChildrenCount; 2388 final View[] children = mChildren; 2389 for (int i = 0; i < count; i++) { 2390 children[i].dispatchFinishTemporaryDetach(); 2391 } 2392 } 2393 2394 /** 2395 * {@inheritDoc} 2396 */ 2397 @Override 2398 void dispatchAttachedToWindow(AttachInfo info, int visibility) { 2399 mGroupFlags |= FLAG_PREVENT_DISPATCH_ATTACHED_TO_WINDOW; 2400 super.dispatchAttachedToWindow(info, visibility); 2401 mGroupFlags &= ~FLAG_PREVENT_DISPATCH_ATTACHED_TO_WINDOW; 2402 2403 final int count = mChildrenCount; 2404 final View[] children = mChildren; 2405 for (int i = 0; i < count; i++) { 2406 final View child = children[i]; 2407 child.dispatchAttachedToWindow(info, 2408 visibility | (child.mViewFlags&VISIBILITY_MASK)); 2409 } 2410 } 2411 2412 @Override 2413 void dispatchScreenStateChanged(int screenState) { 2414 super.dispatchScreenStateChanged(screenState); 2415 2416 final int count = mChildrenCount; 2417 final View[] children = mChildren; 2418 for (int i = 0; i < count; i++) { 2419 children[i].dispatchScreenStateChanged(screenState); 2420 } 2421 } 2422 2423 @Override 2424 boolean dispatchPopulateAccessibilityEventInternal(AccessibilityEvent event) { 2425 boolean handled = false; 2426 if (includeForAccessibility()) { 2427 handled = super.dispatchPopulateAccessibilityEventInternal(event); 2428 if (handled) { 2429 return handled; 2430 } 2431 } 2432 // Let our children have a shot in populating the event. 2433 ChildListForAccessibility children = ChildListForAccessibility.obtain(this, true); 2434 try { 2435 final int childCount = children.getChildCount(); 2436 for (int i = 0; i < childCount; i++) { 2437 View child = children.getChildAt(i); 2438 if ((child.mViewFlags & VISIBILITY_MASK) == VISIBLE) { 2439 handled = child.dispatchPopulateAccessibilityEvent(event); 2440 if (handled) { 2441 children.recycle(); 2442 return handled; 2443 } 2444 } 2445 } 2446 } finally { 2447 children.recycle(); 2448 } 2449 return false; 2450 } 2451 2452 @Override 2453 void onInitializeAccessibilityNodeInfoInternal(AccessibilityNodeInfo info) { 2454 super.onInitializeAccessibilityNodeInfoInternal(info); 2455 if (mAttachInfo != null) { 2456 ArrayList<View> childrenForAccessibility = mAttachInfo.mTempArrayList; 2457 childrenForAccessibility.clear(); 2458 addChildrenForAccessibility(childrenForAccessibility); 2459 final int childrenForAccessibilityCount = childrenForAccessibility.size(); 2460 for (int i = 0; i < childrenForAccessibilityCount; i++) { 2461 View child = childrenForAccessibility.get(i); 2462 info.addChild(child); 2463 } 2464 childrenForAccessibility.clear(); 2465 } 2466 } 2467 2468 @Override 2469 void onInitializeAccessibilityEventInternal(AccessibilityEvent event) { 2470 super.onInitializeAccessibilityEventInternal(event); 2471 event.setClassName(ViewGroup.class.getName()); 2472 } 2473 2474 /** 2475 * @hide 2476 */ 2477 @Override 2478 public void resetAccessibilityStateChanged() { 2479 super.resetAccessibilityStateChanged(); 2480 View[] children = mChildren; 2481 final int childCount = mChildrenCount; 2482 for (int i = 0; i < childCount; i++) { 2483 View child = children[i]; 2484 child.resetAccessibilityStateChanged(); 2485 } 2486 } 2487 2488 /** 2489 * {@inheritDoc} 2490 */ 2491 @Override 2492 void dispatchDetachedFromWindow() { 2493 // If we still have a touch target, we are still in the process of 2494 // dispatching motion events to a child; we need to get rid of that 2495 // child to avoid dispatching events to it after the window is torn 2496 // down. To make sure we keep the child in a consistent state, we 2497 // first send it an ACTION_CANCEL motion event. 2498 cancelAndClearTouchTargets(null); 2499 2500 // Similarly, set ACTION_EXIT to all hover targets and clear them. 2501 exitHoverTargets(); 2502 2503 // In case view is detached while transition is running 2504 mLayoutSuppressed = false; 2505 2506 // Tear down our drag tracking 2507 mDragNotifiedChildren = null; 2508 if (mCurrentDrag != null) { 2509 mCurrentDrag.recycle(); 2510 mCurrentDrag = null; 2511 } 2512 2513 final int count = mChildrenCount; 2514 final View[] children = mChildren; 2515 for (int i = 0; i < count; i++) { 2516 children[i].dispatchDetachedFromWindow(); 2517 } 2518 super.dispatchDetachedFromWindow(); 2519 } 2520 2521 /** 2522 * {@inheritDoc} 2523 */ 2524 @Override 2525 public void setPadding(int left, int top, int right, int bottom) { 2526 super.setPadding(left, top, right, bottom); 2527 2528 if ((mPaddingLeft | mPaddingTop | mPaddingRight | mPaddingBottom) != 0) { 2529 mGroupFlags |= FLAG_PADDING_NOT_NULL; 2530 } else { 2531 mGroupFlags &= ~FLAG_PADDING_NOT_NULL; 2532 } 2533 } 2534 2535 /** 2536 * {@inheritDoc} 2537 */ 2538 @Override 2539 protected void dispatchSaveInstanceState(SparseArray<Parcelable> container) { 2540 super.dispatchSaveInstanceState(container); 2541 final int count = mChildrenCount; 2542 final View[] children = mChildren; 2543 for (int i = 0; i < count; i++) { 2544 View c = children[i]; 2545 if ((c.mViewFlags & PARENT_SAVE_DISABLED_MASK) != PARENT_SAVE_DISABLED) { 2546 c.dispatchSaveInstanceState(container); 2547 } 2548 } 2549 } 2550 2551 /** 2552 * Perform dispatching of a {@link #saveHierarchyState(android.util.SparseArray)} freeze()} 2553 * to only this view, not to its children. For use when overriding 2554 * {@link #dispatchSaveInstanceState(android.util.SparseArray)} dispatchFreeze()} to allow 2555 * subclasses to freeze their own state but not the state of their children. 2556 * 2557 * @param container the container 2558 */ 2559 protected void dispatchFreezeSelfOnly(SparseArray<Parcelable> container) { 2560 super.dispatchSaveInstanceState(container); 2561 } 2562 2563 /** 2564 * {@inheritDoc} 2565 */ 2566 @Override 2567 protected void dispatchRestoreInstanceState(SparseArray<Parcelable> container) { 2568 super.dispatchRestoreInstanceState(container); 2569 final int count = mChildrenCount; 2570 final View[] children = mChildren; 2571 for (int i = 0; i < count; i++) { 2572 View c = children[i]; 2573 if ((c.mViewFlags & PARENT_SAVE_DISABLED_MASK) != PARENT_SAVE_DISABLED) { 2574 c.dispatchRestoreInstanceState(container); 2575 } 2576 } 2577 } 2578 2579 /** 2580 * Perform dispatching of a {@link #restoreHierarchyState(android.util.SparseArray)} 2581 * to only this view, not to its children. For use when overriding 2582 * {@link #dispatchRestoreInstanceState(android.util.SparseArray)} to allow 2583 * subclasses to thaw their own state but not the state of their children. 2584 * 2585 * @param container the container 2586 */ 2587 protected void dispatchThawSelfOnly(SparseArray<Parcelable> container) { 2588 super.dispatchRestoreInstanceState(container); 2589 } 2590 2591 /** 2592 * Enables or disables the drawing cache for each child of this view group. 2593 * 2594 * @param enabled true to enable the cache, false to dispose of it 2595 */ 2596 protected void setChildrenDrawingCacheEnabled(boolean enabled) { 2597 if (enabled || (mPersistentDrawingCache & PERSISTENT_ALL_CACHES) != PERSISTENT_ALL_CACHES) { 2598 final View[] children = mChildren; 2599 final int count = mChildrenCount; 2600 for (int i = 0; i < count; i++) { 2601 children[i].setDrawingCacheEnabled(enabled); 2602 } 2603 } 2604 } 2605 2606 @Override 2607 protected void onAnimationStart() { 2608 super.onAnimationStart(); 2609 2610 // When this ViewGroup's animation starts, build the cache for the children 2611 if ((mGroupFlags & FLAG_ANIMATION_CACHE) == FLAG_ANIMATION_CACHE) { 2612 final int count = mChildrenCount; 2613 final View[] children = mChildren; 2614 final boolean buildCache = !isHardwareAccelerated(); 2615 2616 for (int i = 0; i < count; i++) { 2617 final View child = children[i]; 2618 if ((child.mViewFlags & VISIBILITY_MASK) == VISIBLE) { 2619 child.setDrawingCacheEnabled(true); 2620 if (buildCache) { 2621 child.buildDrawingCache(true); 2622 } 2623 } 2624 } 2625 2626 mGroupFlags |= FLAG_CHILDREN_DRAWN_WITH_CACHE; 2627 } 2628 } 2629 2630 @Override 2631 protected void onAnimationEnd() { 2632 super.onAnimationEnd(); 2633 2634 // When this ViewGroup's animation ends, destroy the cache of the children 2635 if ((mGroupFlags & FLAG_ANIMATION_CACHE) == FLAG_ANIMATION_CACHE) { 2636 mGroupFlags &= ~FLAG_CHILDREN_DRAWN_WITH_CACHE; 2637 2638 if ((mPersistentDrawingCache & PERSISTENT_ANIMATION_CACHE) == 0) { 2639 setChildrenDrawingCacheEnabled(false); 2640 } 2641 } 2642 } 2643 2644 @Override 2645 Bitmap createSnapshot(Bitmap.Config quality, int backgroundColor, boolean skipChildren) { 2646 int count = mChildrenCount; 2647 int[] visibilities = null; 2648 2649 if (skipChildren) { 2650 visibilities = new int[count]; 2651 for (int i = 0; i < count; i++) { 2652 View child = getChildAt(i); 2653 visibilities[i] = child.getVisibility(); 2654 if (visibilities[i] == View.VISIBLE) { 2655 child.setVisibility(INVISIBLE); 2656 } 2657 } 2658 } 2659 2660 Bitmap b = super.createSnapshot(quality, backgroundColor, skipChildren); 2661 2662 if (skipChildren) { 2663 for (int i = 0; i < count; i++) { 2664 getChildAt(i).setVisibility(visibilities[i]); 2665 } 2666 } 2667 2668 return b; 2669 } 2670 2671 private static void drawRect(Canvas canvas, int x1, int y1, int x2, int y2, int color) { 2672 Paint paint = getDebugPaint(); 2673 paint.setColor(color); 2674 2675 canvas.drawLines(getDebugLines(x1, y1, x2, y2), paint); 2676 } 2677 2678 /** 2679 * @hide 2680 */ 2681 protected void onDebugDrawMargins(Canvas canvas) { 2682 for (int i = 0; i < getChildCount(); i++) { 2683 View c = getChildAt(i); 2684 c.getLayoutParams().onDebugDraw(c, canvas); 2685 } 2686 } 2687 2688 /** 2689 * @hide 2690 */ 2691 protected void onDebugDraw(Canvas canvas) { 2692 // Draw optical bounds 2693 if (getLayoutMode() == LAYOUT_BOUNDS) { 2694 for (int i = 0; i < getChildCount(); i++) { 2695 View c = getChildAt(i); 2696 Insets insets = c.getLayoutInsets(); 2697 drawRect(canvas, 2698 c.getLeft() + insets.left, 2699 c.getTop() + insets.top, 2700 c.getRight() - insets.right, 2701 c.getBottom() - insets.bottom, Color.RED); 2702 } 2703 } 2704 2705 // Draw margins 2706 onDebugDrawMargins(canvas); 2707 2708 // Draw bounds 2709 for (int i = 0; i < getChildCount(); i++) { 2710 View c = getChildAt(i); 2711 drawRect(canvas, c.getLeft(), c.getTop(), c.getRight(), c.getBottom(), Color.BLUE); 2712 } 2713 } 2714 2715 /** 2716 * {@inheritDoc} 2717 */ 2718 @Override 2719 protected void dispatchDraw(Canvas canvas) { 2720 final int count = mChildrenCount; 2721 final View[] children = mChildren; 2722 int flags = mGroupFlags; 2723 2724 if ((flags & FLAG_RUN_ANIMATION) != 0 && canAnimate()) { 2725 final boolean cache = (mGroupFlags & FLAG_ANIMATION_CACHE) == FLAG_ANIMATION_CACHE; 2726 2727 final boolean buildCache = !isHardwareAccelerated(); 2728 for (int i = 0; i < count; i++) { 2729 final View child = children[i]; 2730 if ((child.mViewFlags & VISIBILITY_MASK) == VISIBLE) { 2731 final LayoutParams params = child.getLayoutParams(); 2732 attachLayoutAnimationParameters(child, params, i, count); 2733 bindLayoutAnimation(child); 2734 if (cache) { 2735 child.setDrawingCacheEnabled(true); 2736 if (buildCache) { 2737 child.buildDrawingCache(true); 2738 } 2739 } 2740 } 2741 } 2742 2743 final LayoutAnimationController controller = mLayoutAnimationController; 2744 if (controller.willOverlap()) { 2745 mGroupFlags |= FLAG_OPTIMIZE_INVALIDATE; 2746 } 2747 2748 controller.start(); 2749 2750 mGroupFlags &= ~FLAG_RUN_ANIMATION; 2751 mGroupFlags &= ~FLAG_ANIMATION_DONE; 2752 2753 if (cache) { 2754 mGroupFlags |= FLAG_CHILDREN_DRAWN_WITH_CACHE; 2755 } 2756 2757 if (mAnimationListener != null) { 2758 mAnimationListener.onAnimationStart(controller.getAnimation()); 2759 } 2760 } 2761 2762 int saveCount = 0; 2763 final boolean clipToPadding = (flags & CLIP_TO_PADDING_MASK) == CLIP_TO_PADDING_MASK; 2764 if (clipToPadding) { 2765 saveCount = canvas.save(); 2766 canvas.clipRect(mScrollX + mPaddingLeft, mScrollY + mPaddingTop, 2767 mScrollX + mRight - mLeft - mPaddingRight, 2768 mScrollY + mBottom - mTop - mPaddingBottom); 2769 2770 } 2771 2772 // We will draw our child's animation, let's reset the flag 2773 mPrivateFlags &= ~DRAW_ANIMATION; 2774 mGroupFlags &= ~FLAG_INVALIDATE_REQUIRED; 2775 2776 boolean more = false; 2777 final long drawingTime = getDrawingTime(); 2778 2779 if ((flags & FLAG_USE_CHILD_DRAWING_ORDER) == 0) { 2780 for (int i = 0; i < count; i++) { 2781 final View child = children[i]; 2782 if ((child.mViewFlags & VISIBILITY_MASK) == VISIBLE || child.getAnimation() != null) { 2783 more |= drawChild(canvas, child, drawingTime); 2784 } 2785 } 2786 } else { 2787 for (int i = 0; i < count; i++) { 2788 final View child = children[getChildDrawingOrder(count, i)]; 2789 if ((child.mViewFlags & VISIBILITY_MASK) == VISIBLE || child.getAnimation() != null) { 2790 more |= drawChild(canvas, child, drawingTime); 2791 } 2792 } 2793 } 2794 2795 // Draw any disappearing views that have animations 2796 if (mDisappearingChildren != null) { 2797 final ArrayList<View> disappearingChildren = mDisappearingChildren; 2798 final int disappearingCount = disappearingChildren.size() - 1; 2799 // Go backwards -- we may delete as animations finish 2800 for (int i = disappearingCount; i >= 0; i--) { 2801 final View child = disappearingChildren.get(i); 2802 more |= drawChild(canvas, child, drawingTime); 2803 } 2804 } 2805 2806 if (debugDraw()) { 2807 onDebugDraw(canvas); 2808 } 2809 2810 if (clipToPadding) { 2811 canvas.restoreToCount(saveCount); 2812 } 2813 2814 // mGroupFlags might have been updated by drawChild() 2815 flags = mGroupFlags; 2816 2817 if ((flags & FLAG_INVALIDATE_REQUIRED) == FLAG_INVALIDATE_REQUIRED) { 2818 invalidate(true); 2819 } 2820 2821 if ((flags & FLAG_ANIMATION_DONE) == 0 && (flags & FLAG_NOTIFY_ANIMATION_LISTENER) == 0 && 2822 mLayoutAnimationController.isDone() && !more) { 2823 // We want to erase the drawing cache and notify the listener after the 2824 // next frame is drawn because one extra invalidate() is caused by 2825 // drawChild() after the animation is over 2826 mGroupFlags |= FLAG_NOTIFY_ANIMATION_LISTENER; 2827 final Runnable end = new Runnable() { 2828 public void run() { 2829 notifyAnimationListener(); 2830 } 2831 }; 2832 post(end); 2833 } 2834 } 2835 2836 /** 2837 * Returns the index of the child to draw for this iteration. Override this 2838 * if you want to change the drawing order of children. By default, it 2839 * returns i. 2840 * <p> 2841 * NOTE: In order for this method to be called, you must enable child ordering 2842 * first by calling {@link #setChildrenDrawingOrderEnabled(boolean)}. 2843 * 2844 * @param i The current iteration. 2845 * @return The index of the child to draw this iteration. 2846 * 2847 * @see #setChildrenDrawingOrderEnabled(boolean) 2848 * @see #isChildrenDrawingOrderEnabled() 2849 */ 2850 protected int getChildDrawingOrder(int childCount, int i) { 2851 return i; 2852 } 2853 2854 private void notifyAnimationListener() { 2855 mGroupFlags &= ~FLAG_NOTIFY_ANIMATION_LISTENER; 2856 mGroupFlags |= FLAG_ANIMATION_DONE; 2857 2858 if (mAnimationListener != null) { 2859 final Runnable end = new Runnable() { 2860 public void run() { 2861 mAnimationListener.onAnimationEnd(mLayoutAnimationController.getAnimation()); 2862 } 2863 }; 2864 post(end); 2865 } 2866 2867 if ((mGroupFlags & FLAG_ANIMATION_CACHE) == FLAG_ANIMATION_CACHE) { 2868 mGroupFlags &= ~FLAG_CHILDREN_DRAWN_WITH_CACHE; 2869 if ((mPersistentDrawingCache & PERSISTENT_ANIMATION_CACHE) == 0) { 2870 setChildrenDrawingCacheEnabled(false); 2871 } 2872 } 2873 2874 invalidate(true); 2875 } 2876 2877 /** 2878 * This method is used to cause children of this ViewGroup to restore or recreate their 2879 * display lists. It is called by getDisplayList() when the parent ViewGroup does not need 2880 * to recreate its own display list, which would happen if it went through the normal 2881 * draw/dispatchDraw mechanisms. 2882 * 2883 * @hide 2884 */ 2885 @Override 2886 protected void dispatchGetDisplayList() { 2887 final int count = mChildrenCount; 2888 final View[] children = mChildren; 2889 for (int i = 0; i < count; i++) { 2890 final View child = children[i]; 2891 if (((child.mViewFlags & VISIBILITY_MASK) == VISIBLE || child.getAnimation() != null) && 2892 child.hasStaticLayer()) { 2893 child.mRecreateDisplayList = (child.mPrivateFlags & INVALIDATED) == INVALIDATED; 2894 child.mPrivateFlags &= ~INVALIDATED; 2895 child.getDisplayList(); 2896 child.mRecreateDisplayList = false; 2897 } 2898 } 2899 } 2900 2901 /** 2902 * Draw one child of this View Group. This method is responsible for getting 2903 * the canvas in the right state. This includes clipping, translating so 2904 * that the child's scrolled origin is at 0, 0, and applying any animation 2905 * transformations. 2906 * 2907 * @param canvas The canvas on which to draw the child 2908 * @param child Who to draw 2909 * @param drawingTime The time at which draw is occurring 2910 * @return True if an invalidate() was issued 2911 */ 2912 protected boolean drawChild(Canvas canvas, View child, long drawingTime) { 2913 return child.draw(canvas, this, drawingTime); 2914 } 2915 2916 /** 2917 * 2918 * @param enabled True if children should be drawn with layers, false otherwise. 2919 * 2920 * @hide 2921 */ 2922 public void setChildrenLayersEnabled(boolean enabled) { 2923 if (enabled != mDrawLayers) { 2924 mDrawLayers = enabled; 2925 invalidate(true); 2926 2927 boolean flushLayers = !enabled; 2928 AttachInfo info = mAttachInfo; 2929 if (info != null && info.mHardwareRenderer != null && 2930 info.mHardwareRenderer.isEnabled()) { 2931 if (!info.mHardwareRenderer.validate()) { 2932 flushLayers = false; 2933 } 2934 } else { 2935 flushLayers = false; 2936 } 2937 2938 // We need to invalidate any child with a layer. For instance, 2939 // if a child is backed by a hardware layer and we disable layers 2940 // the child is marked as not dirty (flags cleared the last time 2941 // the child was drawn inside its layer.) However, that child might 2942 // never have created its own display list or have an obsolete 2943 // display list. By invalidating the child we ensure the display 2944 // list is in sync with the content of the hardware layer. 2945 for (int i = 0; i < mChildrenCount; i++) { 2946 View child = mChildren[i]; 2947 if (child.mLayerType != LAYER_TYPE_NONE) { 2948 if (flushLayers) child.flushLayer(); 2949 child.invalidate(true); 2950 } 2951 } 2952 } 2953 } 2954 2955 /** 2956 * By default, children are clipped to their bounds before drawing. This 2957 * allows view groups to override this behavior for animations, etc. 2958 * 2959 * @param clipChildren true to clip children to their bounds, 2960 * false otherwise 2961 * @attr ref android.R.styleable#ViewGroup_clipChildren 2962 */ 2963 public void setClipChildren(boolean clipChildren) { 2964 boolean previousValue = (mGroupFlags & FLAG_CLIP_CHILDREN) == FLAG_CLIP_CHILDREN; 2965 if (clipChildren != previousValue) { 2966 setBooleanFlag(FLAG_CLIP_CHILDREN, clipChildren); 2967 for (int i = 0; i < mChildrenCount; ++i) { 2968 View child = getChildAt(i); 2969 if (child.mDisplayList != null) { 2970 child.mDisplayList.setClipChildren(clipChildren); 2971 } 2972 } 2973 } 2974 } 2975 2976 /** 2977 * By default, children are clipped to the padding of the ViewGroup. This 2978 * allows view groups to override this behavior 2979 * 2980 * @param clipToPadding true to clip children to the padding of the 2981 * group, false otherwise 2982 * @attr ref android.R.styleable#ViewGroup_clipToPadding 2983 */ 2984 public void setClipToPadding(boolean clipToPadding) { 2985 setBooleanFlag(FLAG_CLIP_TO_PADDING, clipToPadding); 2986 } 2987 2988 /** 2989 * {@inheritDoc} 2990 */ 2991 @Override 2992 public void dispatchSetSelected(boolean selected) { 2993 final View[] children = mChildren; 2994 final int count = mChildrenCount; 2995 for (int i = 0; i < count; i++) { 2996 children[i].setSelected(selected); 2997 } 2998 } 2999 3000 /** 3001 * {@inheritDoc} 3002 */ 3003 @Override 3004 public void dispatchSetActivated(boolean activated) { 3005 final View[] children = mChildren; 3006 final int count = mChildrenCount; 3007 for (int i = 0; i < count; i++) { 3008 children[i].setActivated(activated); 3009 } 3010 } 3011 3012 @Override 3013 protected void dispatchSetPressed(boolean pressed) { 3014 final View[] children = mChildren; 3015 final int count = mChildrenCount; 3016 for (int i = 0; i < count; i++) { 3017 final View child = children[i]; 3018 // Children that are clickable on their own should not 3019 // show a pressed state when their parent view does. 3020 // Clearing a pressed state always propagates. 3021 if (!pressed || (!child.isClickable() && !child.isLongClickable())) { 3022 child.setPressed(pressed); 3023 } 3024 } 3025 } 3026 3027 /** 3028 * When this property is set to true, this ViewGroup supports static transformations on 3029 * children; this causes 3030 * {@link #getChildStaticTransformation(View, android.view.animation.Transformation)} to be 3031 * invoked when a child is drawn. 3032 * 3033 * Any subclass overriding 3034 * {@link #getChildStaticTransformation(View, android.view.animation.Transformation)} should 3035 * set this property to true. 3036 * 3037 * @param enabled True to enable static transformations on children, false otherwise. 3038 * 3039 * @see #FLAG_SUPPORT_STATIC_TRANSFORMATIONS 3040 */ 3041 protected void setStaticTransformationsEnabled(boolean enabled) { 3042 setBooleanFlag(FLAG_SUPPORT_STATIC_TRANSFORMATIONS, enabled); 3043 } 3044 3045 /** 3046 * Sets <code>t</code> to be the static transformation of the child, if set, returning a 3047 * boolean to indicate whether a static transform was set. The default implementation 3048 * simply returns <code>false</code>; subclasses may override this method for different 3049 * behavior. 3050 * 3051 * @param child The child view whose static transform is being requested 3052 * @param t The Transformation which will hold the result 3053 * @return true if the transformation was set, false otherwise 3054 * @see #setStaticTransformationsEnabled(boolean) 3055 */ 3056 protected boolean getChildStaticTransformation(View child, Transformation t) { 3057 return false; 3058 } 3059 3060 /** 3061 * {@hide} 3062 */ 3063 @Override 3064 protected View findViewTraversal(int id) { 3065 if (id == mID) { 3066 return this; 3067 } 3068 3069 final View[] where = mChildren; 3070 final int len = mChildrenCount; 3071 3072 for (int i = 0; i < len; i++) { 3073 View v = where[i]; 3074 3075 if ((v.mPrivateFlags & IS_ROOT_NAMESPACE) == 0) { 3076 v = v.findViewById(id); 3077 3078 if (v != null) { 3079 return v; 3080 } 3081 } 3082 } 3083 3084 return null; 3085 } 3086 3087 /** 3088 * {@hide} 3089 */ 3090 @Override 3091 protected View findViewWithTagTraversal(Object tag) { 3092 if (tag != null && tag.equals(mTag)) { 3093 return this; 3094 } 3095 3096 final View[] where = mChildren; 3097 final int len = mChildrenCount; 3098 3099 for (int i = 0; i < len; i++) { 3100 View v = where[i]; 3101 3102 if ((v.mPrivateFlags & IS_ROOT_NAMESPACE) == 0) { 3103 v = v.findViewWithTag(tag); 3104 3105 if (v != null) { 3106 return v; 3107 } 3108 } 3109 } 3110 3111 return null; 3112 } 3113 3114 /** 3115 * {@hide} 3116 */ 3117 @Override 3118 protected View findViewByPredicateTraversal(Predicate<View> predicate, View childToSkip) { 3119 if (predicate.apply(this)) { 3120 return this; 3121 } 3122 3123 final View[] where = mChildren; 3124 final int len = mChildrenCount; 3125 3126 for (int i = 0; i < len; i++) { 3127 View v = where[i]; 3128 3129 if (v != childToSkip && (v.mPrivateFlags & IS_ROOT_NAMESPACE) == 0) { 3130 v = v.findViewByPredicate(predicate); 3131 3132 if (v != null) { 3133 return v; 3134 } 3135 } 3136 } 3137 3138 return null; 3139 } 3140 3141 /** 3142 * Adds a child view. If no layout parameters are already set on the child, the 3143 * default parameters for this ViewGroup are set on the child. 3144 * 3145 * @param child the child view to add 3146 * 3147 * @see #generateDefaultLayoutParams() 3148 */ 3149 public void addView(View child) { 3150 addView(child, -1); 3151 } 3152 3153 /** 3154 * Adds a child view. If no layout parameters are already set on the child, the 3155 * default parameters for this ViewGroup are set on the child. 3156 * 3157 * @param child the child view to add 3158 * @param index the position at which to add the child 3159 * 3160 * @see #generateDefaultLayoutParams() 3161 */ 3162 public void addView(View child, int index) { 3163 LayoutParams params = child.getLayoutParams(); 3164 if (params == null) { 3165 params = generateDefaultLayoutParams(); 3166 if (params == null) { 3167 throw new IllegalArgumentException("generateDefaultLayoutParams() cannot return null"); 3168 } 3169 } 3170 addView(child, index, params); 3171 } 3172 3173 /** 3174 * Adds a child view with this ViewGroup's default layout parameters and the 3175 * specified width and height. 3176 * 3177 * @param child the child view to add 3178 */ 3179 public void addView(View child, int width, int height) { 3180 final LayoutParams params = generateDefaultLayoutParams(); 3181 params.width = width; 3182 params.height = height; 3183 addView(child, -1, params); 3184 } 3185 3186 /** 3187 * Adds a child view with the specified layout parameters. 3188 * 3189 * @param child the child view to add 3190 * @param params the layout parameters to set on the child 3191 */ 3192 public void addView(View child, LayoutParams params) { 3193 addView(child, -1, params); 3194 } 3195 3196 /** 3197 * Adds a child view with the specified layout parameters. 3198 * 3199 * @param child the child view to add 3200 * @param index the position at which to add the child 3201 * @param params the layout parameters to set on the child 3202 */ 3203 public void addView(View child, int index, LayoutParams params) { 3204 if (DBG) { 3205 System.out.println(this + " addView"); 3206 } 3207 3208 // addViewInner() will call child.requestLayout() when setting the new LayoutParams 3209 // therefore, we call requestLayout() on ourselves before, so that the child's request 3210 // will be blocked at our level 3211 requestLayout(); 3212 invalidate(true); 3213 addViewInner(child, index, params, false); 3214 } 3215 3216 /** 3217 * {@inheritDoc} 3218 */ 3219 public void updateViewLayout(View view, ViewGroup.LayoutParams params) { 3220 if (!checkLayoutParams(params)) { 3221 throw new IllegalArgumentException("Invalid LayoutParams supplied to " + this); 3222 } 3223 if (view.mParent != this) { 3224 throw new IllegalArgumentException("Given view not a child of " + this); 3225 } 3226 view.setLayoutParams(params); 3227 } 3228 3229 /** 3230 * {@inheritDoc} 3231 */ 3232 protected boolean checkLayoutParams(ViewGroup.LayoutParams p) { 3233 return p != null; 3234 } 3235 3236 /** 3237 * Interface definition for a callback to be invoked when the hierarchy 3238 * within this view changed. The hierarchy changes whenever a child is added 3239 * to or removed from this view. 3240 */ 3241 public interface OnHierarchyChangeListener { 3242 /** 3243 * Called when a new child is added to a parent view. 3244 * 3245 * @param parent the view in which a child was added 3246 * @param child the new child view added in the hierarchy 3247 */ 3248 void onChildViewAdded(View parent, View child); 3249 3250 /** 3251 * Called when a child is removed from a parent view. 3252 * 3253 * @param parent the view from which the child was removed 3254 * @param child the child removed from the hierarchy 3255 */ 3256 void onChildViewRemoved(View parent, View child); 3257 } 3258 3259 /** 3260 * Register a callback to be invoked when a child is added to or removed 3261 * from this view. 3262 * 3263 * @param listener the callback to invoke on hierarchy change 3264 */ 3265 public void setOnHierarchyChangeListener(OnHierarchyChangeListener listener) { 3266 mOnHierarchyChangeListener = listener; 3267 } 3268 3269 /** 3270 * @hide 3271 */ 3272 protected void onViewAdded(View child) { 3273 if (mOnHierarchyChangeListener != null) { 3274 mOnHierarchyChangeListener.onChildViewAdded(this, child); 3275 } 3276 } 3277 3278 /** 3279 * @hide 3280 */ 3281 protected void onViewRemoved(View child) { 3282 if (mOnHierarchyChangeListener != null) { 3283 mOnHierarchyChangeListener.onChildViewRemoved(this, child); 3284 } 3285 } 3286 3287 /** 3288 * Adds a view during layout. This is useful if in your onLayout() method, 3289 * you need to add more views (as does the list view for example). 3290 * 3291 * If index is negative, it means put it at the end of the list. 3292 * 3293 * @param child the view to add to the group 3294 * @param index the index at which the child must be added 3295 * @param params the layout parameters to associate with the child 3296 * @return true if the child was added, false otherwise 3297 */ 3298 protected boolean addViewInLayout(View child, int index, LayoutParams params) { 3299 return addViewInLayout(child, index, params, false); 3300 } 3301 3302 /** 3303 * Adds a view during layout. This is useful if in your onLayout() method, 3304 * you need to add more views (as does the list view for example). 3305 * 3306 * If index is negative, it means put it at the end of the list. 3307 * 3308 * @param child the view to add to the group 3309 * @param index the index at which the child must be added 3310 * @param params the layout parameters to associate with the child 3311 * @param preventRequestLayout if true, calling this method will not trigger a 3312 * layout request on child 3313 * @return true if the child was added, false otherwise 3314 */ 3315 protected boolean addViewInLayout(View child, int index, LayoutParams params, 3316 boolean preventRequestLayout) { 3317 child.mParent = null; 3318 addViewInner(child, index, params, preventRequestLayout); 3319 child.mPrivateFlags = (child.mPrivateFlags & ~DIRTY_MASK) | DRAWN; 3320 return true; 3321 } 3322 3323 /** 3324 * Prevents the specified child to be laid out during the next layout pass. 3325 * 3326 * @param child the child on which to perform the cleanup 3327 */ 3328 protected void cleanupLayoutState(View child) { 3329 child.mPrivateFlags &= ~View.FORCE_LAYOUT; 3330 } 3331 3332 private void addViewInner(View child, int index, LayoutParams params, 3333 boolean preventRequestLayout) { 3334 3335 if (mTransition != null) { 3336 // Don't prevent other add transitions from completing, but cancel remove 3337 // transitions to let them complete the process before we add to the container 3338 mTransition.cancel(LayoutTransition.DISAPPEARING); 3339 } 3340 3341 if (child.getParent() != null) { 3342 throw new IllegalStateException("The specified child already has a parent. " + 3343 "You must call removeView() on the child's parent first."); 3344 } 3345 3346 if (mTransition != null) { 3347 mTransition.addChild(this, child); 3348 } 3349 3350 if (!checkLayoutParams(params)) { 3351 params = generateLayoutParams(params); 3352 } 3353 3354 if (preventRequestLayout) { 3355 child.mLayoutParams = params; 3356 } else { 3357 child.setLayoutParams(params); 3358 } 3359 3360 if (index < 0) { 3361 index = mChildrenCount; 3362 } 3363 3364 addInArray(child, index); 3365 3366 // tell our children 3367 if (preventRequestLayout) { 3368 child.assignParent(this); 3369 } else { 3370 child.mParent = this; 3371 } 3372 3373 if (child.hasFocus()) { 3374 requestChildFocus(child, child.findFocus()); 3375 } 3376 3377 AttachInfo ai = mAttachInfo; 3378 if (ai != null && (mGroupFlags & FLAG_PREVENT_DISPATCH_ATTACHED_TO_WINDOW) == 0) { 3379 boolean lastKeepOn = ai.mKeepScreenOn; 3380 ai.mKeepScreenOn = false; 3381 child.dispatchAttachedToWindow(mAttachInfo, (mViewFlags&VISIBILITY_MASK)); 3382 if (ai.mKeepScreenOn) { 3383 needGlobalAttributesUpdate(true); 3384 } 3385 ai.mKeepScreenOn = lastKeepOn; 3386 } 3387 3388 onViewAdded(child); 3389 3390 if ((child.mViewFlags & DUPLICATE_PARENT_STATE) == DUPLICATE_PARENT_STATE) { 3391 mGroupFlags |= FLAG_NOTIFY_CHILDREN_ON_DRAWABLE_STATE_CHANGE; 3392 } 3393 3394 if (child.hasTransientState()) { 3395 childHasTransientStateChanged(child, true); 3396 } 3397 } 3398 3399 private void addInArray(View child, int index) { 3400 View[] children = mChildren; 3401 final int count = mChildrenCount; 3402 final int size = children.length; 3403 if (index == count) { 3404 if (size == count) { 3405 mChildren = new View[size + ARRAY_CAPACITY_INCREMENT]; 3406 System.arraycopy(children, 0, mChildren, 0, size); 3407 children = mChildren; 3408 } 3409 children[mChildrenCount++] = child; 3410 } else if (index < count) { 3411 if (size == count) { 3412 mChildren = new View[size + ARRAY_CAPACITY_INCREMENT]; 3413 System.arraycopy(children, 0, mChildren, 0, index); 3414 System.arraycopy(children, index, mChildren, index + 1, count - index); 3415 children = mChildren; 3416 } else { 3417 System.arraycopy(children, index, children, index + 1, count - index); 3418 } 3419 children[index] = child; 3420 mChildrenCount++; 3421 if (mLastTouchDownIndex >= index) { 3422 mLastTouchDownIndex++; 3423 } 3424 } else { 3425 throw new IndexOutOfBoundsException("index=" + index + " count=" + count); 3426 } 3427 } 3428 3429 // This method also sets the child's mParent to null 3430 private void removeFromArray(int index) { 3431 final View[] children = mChildren; 3432 if (!(mTransitioningViews != null && mTransitioningViews.contains(children[index]))) { 3433 children[index].mParent = null; 3434 } 3435 final int count = mChildrenCount; 3436 if (index == count - 1) { 3437 children[--mChildrenCount] = null; 3438 } else if (index >= 0 && index < count) { 3439 System.arraycopy(children, index + 1, children, index, count - index - 1); 3440 children[--mChildrenCount] = null; 3441 } else { 3442 throw new IndexOutOfBoundsException(); 3443 } 3444 if (mLastTouchDownIndex == index) { 3445 mLastTouchDownTime = 0; 3446 mLastTouchDownIndex = -1; 3447 } else if (mLastTouchDownIndex > index) { 3448 mLastTouchDownIndex--; 3449 } 3450 } 3451 3452 // This method also sets the children's mParent to null 3453 private void removeFromArray(int start, int count) { 3454 final View[] children = mChildren; 3455 final int childrenCount = mChildrenCount; 3456 3457 start = Math.max(0, start); 3458 final int end = Math.min(childrenCount, start + count); 3459 3460 if (start == end) { 3461 return; 3462 } 3463 3464 if (end == childrenCount) { 3465 for (int i = start; i < end; i++) { 3466 children[i].mParent = null; 3467 children[i] = null; 3468 } 3469 } else { 3470 for (int i = start; i < end; i++) { 3471 children[i].mParent = null; 3472 } 3473 3474 // Since we're looping above, we might as well do the copy, but is arraycopy() 3475 // faster than the extra 2 bounds checks we would do in the loop? 3476 System.arraycopy(children, end, children, start, childrenCount - end); 3477 3478 for (int i = childrenCount - (end - start); i < childrenCount; i++) { 3479 children[i] = null; 3480 } 3481 } 3482 3483 mChildrenCount -= (end - start); 3484 } 3485 3486 private void bindLayoutAnimation(View child) { 3487 Animation a = mLayoutAnimationController.getAnimationForView(child); 3488 child.setAnimation(a); 3489 } 3490 3491 /** 3492 * Subclasses should override this method to set layout animation 3493 * parameters on the supplied child. 3494 * 3495 * @param child the child to associate with animation parameters 3496 * @param params the child's layout parameters which hold the animation 3497 * parameters 3498 * @param index the index of the child in the view group 3499 * @param count the number of children in the view group 3500 */ 3501 protected void attachLayoutAnimationParameters(View child, 3502 LayoutParams params, int index, int count) { 3503 LayoutAnimationController.AnimationParameters animationParams = 3504 params.layoutAnimationParameters; 3505 if (animationParams == null) { 3506 animationParams = new LayoutAnimationController.AnimationParameters(); 3507 params.layoutAnimationParameters = animationParams; 3508 } 3509 3510 animationParams.count = count; 3511 animationParams.index = index; 3512 } 3513 3514 /** 3515 * {@inheritDoc} 3516 */ 3517 public void removeView(View view) { 3518 removeViewInternal(view); 3519 requestLayout(); 3520 invalidate(true); 3521 } 3522 3523 /** 3524 * Removes a view during layout. This is useful if in your onLayout() method, 3525 * you need to remove more views. 3526 * 3527 * @param view the view to remove from the group 3528 */ 3529 public void removeViewInLayout(View view) { 3530 removeViewInternal(view); 3531 } 3532 3533 /** 3534 * Removes a range of views during layout. This is useful if in your onLayout() method, 3535 * you need to remove more views. 3536 * 3537 * @param start the index of the first view to remove from the group 3538 * @param count the number of views to remove from the group 3539 */ 3540 public void removeViewsInLayout(int start, int count) { 3541 removeViewsInternal(start, count); 3542 } 3543 3544 /** 3545 * Removes the view at the specified position in the group. 3546 * 3547 * @param index the position in the group of the view to remove 3548 */ 3549 public void removeViewAt(int index) { 3550 removeViewInternal(index, getChildAt(index)); 3551 requestLayout(); 3552 invalidate(true); 3553 } 3554 3555 /** 3556 * Removes the specified range of views from the group. 3557 * 3558 * @param start the first position in the group of the range of views to remove 3559 * @param count the number of views to remove 3560 */ 3561 public void removeViews(int start, int count) { 3562 removeViewsInternal(start, count); 3563 requestLayout(); 3564 invalidate(true); 3565 } 3566 3567 private void removeViewInternal(View view) { 3568 final int index = indexOfChild(view); 3569 if (index >= 0) { 3570 removeViewInternal(index, view); 3571 } 3572 } 3573 3574 private void removeViewInternal(int index, View view) { 3575 3576 if (mTransition != null) { 3577 mTransition.removeChild(this, view); 3578 } 3579 3580 boolean clearChildFocus = false; 3581 if (view == mFocused) { 3582 view.unFocus(); 3583 clearChildFocus = true; 3584 } 3585 3586 cancelTouchTarget(view); 3587 cancelHoverTarget(view); 3588 3589 if (view.getAnimation() != null || 3590 (mTransitioningViews != null && mTransitioningViews.contains(view))) { 3591 addDisappearingView(view); 3592 } else if (view.mAttachInfo != null) { 3593 view.dispatchDetachedFromWindow(); 3594 } 3595 3596 if (view.hasTransientState()) { 3597 childHasTransientStateChanged(view, false); 3598 } 3599 3600 onViewRemoved(view); 3601 3602 needGlobalAttributesUpdate(false); 3603 3604 removeFromArray(index); 3605 3606 if (clearChildFocus) { 3607 clearChildFocus(view); 3608 ensureInputFocusOnFirstFocusable(); 3609 } 3610 3611 if (view.isAccessibilityFocused()) { 3612 view.clearAccessibilityFocus(); 3613 } 3614 } 3615 3616 /** 3617 * Sets the LayoutTransition object for this ViewGroup. If the LayoutTransition object is 3618 * not null, changes in layout which occur because of children being added to or removed from 3619 * the ViewGroup will be animated according to the animations defined in that LayoutTransition 3620 * object. By default, the transition object is null (so layout changes are not animated). 3621 * 3622 * @param transition The LayoutTransition object that will animated changes in layout. A value 3623 * of <code>null</code> means no transition will run on layout changes. 3624 * @attr ref android.R.styleable#ViewGroup_animateLayoutChanges 3625 */ 3626 public void setLayoutTransition(LayoutTransition transition) { 3627 if (mTransition != null) { 3628 mTransition.removeTransitionListener(mLayoutTransitionListener); 3629 } 3630 mTransition = transition; 3631 if (mTransition != null) { 3632 mTransition.addTransitionListener(mLayoutTransitionListener); 3633 } 3634 } 3635 3636 /** 3637 * Gets the LayoutTransition object for this ViewGroup. If the LayoutTransition object is 3638 * not null, changes in layout which occur because of children being added to or removed from 3639 * the ViewGroup will be animated according to the animations defined in that LayoutTransition 3640 * object. By default, the transition object is null (so layout changes are not animated). 3641 * 3642 * @return LayoutTranstion The LayoutTransition object that will animated changes in layout. 3643 * A value of <code>null</code> means no transition will run on layout changes. 3644 */ 3645 public LayoutTransition getLayoutTransition() { 3646 return mTransition; 3647 } 3648 3649 private void removeViewsInternal(int start, int count) { 3650 final View focused = mFocused; 3651 final boolean detach = mAttachInfo != null; 3652 View clearChildFocus = null; 3653 3654 final View[] children = mChildren; 3655 final int end = start + count; 3656 3657 for (int i = start; i < end; i++) { 3658 final View view = children[i]; 3659 3660 if (mTransition != null) { 3661 mTransition.removeChild(this, view); 3662 } 3663 3664 if (view == focused) { 3665 view.unFocus(); 3666 clearChildFocus = view; 3667 } 3668 3669 cancelTouchTarget(view); 3670 cancelHoverTarget(view); 3671 3672 if (view.getAnimation() != null || 3673 (mTransitioningViews != null && mTransitioningViews.contains(view))) { 3674 addDisappearingView(view); 3675 } else if (detach) { 3676 view.dispatchDetachedFromWindow(); 3677 } 3678 3679 if (view.hasTransientState()) { 3680 childHasTransientStateChanged(view, false); 3681 } 3682 3683 needGlobalAttributesUpdate(false); 3684 3685 onViewRemoved(view); 3686 } 3687 3688 removeFromArray(start, count); 3689 3690 if (clearChildFocus != null) { 3691 clearChildFocus(clearChildFocus); 3692 ensureInputFocusOnFirstFocusable(); 3693 } 3694 } 3695 3696 /** 3697 * Call this method to remove all child views from the 3698 * ViewGroup. 3699 */ 3700 public void removeAllViews() { 3701 removeAllViewsInLayout(); 3702 requestLayout(); 3703 invalidate(true); 3704 } 3705 3706 /** 3707 * Called by a ViewGroup subclass to remove child views from itself, 3708 * when it must first know its size on screen before it can calculate how many 3709 * child views it will render. An example is a Gallery or a ListView, which 3710 * may "have" 50 children, but actually only render the number of children 3711 * that can currently fit inside the object on screen. Do not call 3712 * this method unless you are extending ViewGroup and understand the 3713 * view measuring and layout pipeline. 3714 */ 3715 public void removeAllViewsInLayout() { 3716 final int count = mChildrenCount; 3717 if (count <= 0) { 3718 return; 3719 } 3720 3721 final View[] children = mChildren; 3722 mChildrenCount = 0; 3723 3724 final View focused = mFocused; 3725 final boolean detach = mAttachInfo != null; 3726 View clearChildFocus = null; 3727 3728 needGlobalAttributesUpdate(false); 3729 3730 for (int i = count - 1; i >= 0; i--) { 3731 final View view = children[i]; 3732 3733 if (mTransition != null) { 3734 mTransition.removeChild(this, view); 3735 } 3736 3737 if (view == focused) { 3738 view.unFocus(); 3739 clearChildFocus = view; 3740 } 3741 3742 cancelTouchTarget(view); 3743 cancelHoverTarget(view); 3744 3745 if (view.getAnimation() != null || 3746 (mTransitioningViews != null && mTransitioningViews.contains(view))) { 3747 addDisappearingView(view); 3748 } else if (detach) { 3749 view.dispatchDetachedFromWindow(); 3750 } 3751 3752 if (view.hasTransientState()) { 3753 childHasTransientStateChanged(view, false); 3754 } 3755 3756 onViewRemoved(view); 3757 3758 view.mParent = null; 3759 children[i] = null; 3760 } 3761 3762 if (clearChildFocus != null) { 3763 clearChildFocus(clearChildFocus); 3764 ensureInputFocusOnFirstFocusable(); 3765 } 3766 } 3767 3768 /** 3769 * Finishes the removal of a detached view. This method will dispatch the detached from 3770 * window event and notify the hierarchy change listener. 3771 * 3772 * @param child the child to be definitely removed from the view hierarchy 3773 * @param animate if true and the view has an animation, the view is placed in the 3774 * disappearing views list, otherwise, it is detached from the window 3775 * 3776 * @see #attachViewToParent(View, int, android.view.ViewGroup.LayoutParams) 3777 * @see #detachAllViewsFromParent() 3778 * @see #detachViewFromParent(View) 3779 * @see #detachViewFromParent(int) 3780 */ 3781 protected void removeDetachedView(View child, boolean animate) { 3782 if (mTransition != null) { 3783 mTransition.removeChild(this, child); 3784 } 3785 3786 if (child == mFocused) { 3787 child.clearFocus(); 3788 } 3789 3790 cancelTouchTarget(child); 3791 cancelHoverTarget(child); 3792 3793 if ((animate && child.getAnimation() != null) || 3794 (mTransitioningViews != null && mTransitioningViews.contains(child))) { 3795 addDisappearingView(child); 3796 } else if (child.mAttachInfo != null) { 3797 child.dispatchDetachedFromWindow(); 3798 } 3799 3800 if (child.hasTransientState()) { 3801 childHasTransientStateChanged(child, false); 3802 } 3803 3804 onViewRemoved(child); 3805 } 3806 3807 /** 3808 * Attaches a view to this view group. Attaching a view assigns this group as the parent, 3809 * sets the layout parameters and puts the view in the list of children so it can be retrieved 3810 * by calling {@link #getChildAt(int)}. 3811 * 3812 * This method should be called only for view which were detached from their parent. 3813 * 3814 * @param child the child to attach 3815 * @param index the index at which the child should be attached 3816 * @param params the layout parameters of the child 3817 * 3818 * @see #removeDetachedView(View, boolean) 3819 * @see #detachAllViewsFromParent() 3820 * @see #detachViewFromParent(View) 3821 * @see #detachViewFromParent(int) 3822 */ 3823 protected void attachViewToParent(View child, int index, LayoutParams params) { 3824 child.mLayoutParams = params; 3825 3826 if (index < 0) { 3827 index = mChildrenCount; 3828 } 3829 3830 addInArray(child, index); 3831 3832 child.mParent = this; 3833 child.mPrivateFlags = (child.mPrivateFlags & ~DIRTY_MASK & ~DRAWING_CACHE_VALID) | 3834 DRAWN | INVALIDATED; 3835 this.mPrivateFlags |= INVALIDATED; 3836 3837 if (child.hasFocus()) { 3838 requestChildFocus(child, child.findFocus()); 3839 } 3840 } 3841 3842 /** 3843 * Detaches a view from its parent. Detaching a view should be temporary and followed 3844 * either by a call to {@link #attachViewToParent(View, int, android.view.ViewGroup.LayoutParams)} 3845 * or a call to {@link #removeDetachedView(View, boolean)}. When a view is detached, 3846 * its parent is null and cannot be retrieved by a call to {@link #getChildAt(int)}. 3847 * 3848 * @param child the child to detach 3849 * 3850 * @see #detachViewFromParent(int) 3851 * @see #detachViewsFromParent(int, int) 3852 * @see #detachAllViewsFromParent() 3853 * @see #attachViewToParent(View, int, android.view.ViewGroup.LayoutParams) 3854 * @see #removeDetachedView(View, boolean) 3855 */ 3856 protected void detachViewFromParent(View child) { 3857 removeFromArray(indexOfChild(child)); 3858 } 3859 3860 /** 3861 * Detaches a view from its parent. Detaching a view should be temporary and followed 3862 * either by a call to {@link #attachViewToParent(View, int, android.view.ViewGroup.LayoutParams)} 3863 * or a call to {@link #removeDetachedView(View, boolean)}. When a view is detached, 3864 * its parent is null and cannot be retrieved by a call to {@link #getChildAt(int)}. 3865 * 3866 * @param index the index of the child to detach 3867 * 3868 * @see #detachViewFromParent(View) 3869 * @see #detachAllViewsFromParent() 3870 * @see #detachViewsFromParent(int, int) 3871 * @see #attachViewToParent(View, int, android.view.ViewGroup.LayoutParams) 3872 * @see #removeDetachedView(View, boolean) 3873 */ 3874 protected void detachViewFromParent(int index) { 3875 removeFromArray(index); 3876 } 3877 3878 /** 3879 * Detaches a range of view from their parent. Detaching a view should be temporary and followed 3880 * either by a call to {@link #attachViewToParent(View, int, android.view.ViewGroup.LayoutParams)} 3881 * or a call to {@link #removeDetachedView(View, boolean)}. When a view is detached, its 3882 * parent is null and cannot be retrieved by a call to {@link #getChildAt(int)}. 3883 * 3884 * @param start the first index of the childrend range to detach 3885 * @param count the number of children to detach 3886 * 3887 * @see #detachViewFromParent(View) 3888 * @see #detachViewFromParent(int) 3889 * @see #detachAllViewsFromParent() 3890 * @see #attachViewToParent(View, int, android.view.ViewGroup.LayoutParams) 3891 * @see #removeDetachedView(View, boolean) 3892 */ 3893 protected void detachViewsFromParent(int start, int count) { 3894 removeFromArray(start, count); 3895 } 3896 3897 /** 3898 * Detaches all views from the parent. Detaching a view should be temporary and followed 3899 * either by a call to {@link #attachViewToParent(View, int, android.view.ViewGroup.LayoutParams)} 3900 * or a call to {@link #removeDetachedView(View, boolean)}. When a view is detached, 3901 * its parent is null and cannot be retrieved by a call to {@link #getChildAt(int)}. 3902 * 3903 * @see #detachViewFromParent(View) 3904 * @see #detachViewFromParent(int) 3905 * @see #detachViewsFromParent(int, int) 3906 * @see #attachViewToParent(View, int, android.view.ViewGroup.LayoutParams) 3907 * @see #removeDetachedView(View, boolean) 3908 */ 3909 protected void detachAllViewsFromParent() { 3910 final int count = mChildrenCount; 3911 if (count <= 0) { 3912 return; 3913 } 3914 3915 final View[] children = mChildren; 3916 mChildrenCount = 0; 3917 3918 for (int i = count - 1; i >= 0; i--) { 3919 children[i].mParent = null; 3920 children[i] = null; 3921 } 3922 } 3923 3924 /** 3925 * Don't call or override this method. It is used for the implementation of 3926 * the view hierarchy. 3927 */ 3928 public final void invalidateChild(View child, final Rect dirty) { 3929 if (ViewDebug.TRACE_HIERARCHY) { 3930 ViewDebug.trace(this, ViewDebug.HierarchyTraceType.INVALIDATE_CHILD); 3931 } 3932 3933 ViewParent parent = this; 3934 3935 final AttachInfo attachInfo = mAttachInfo; 3936 if (attachInfo != null) { 3937 // If the child is drawing an animation, we want to copy this flag onto 3938 // ourselves and the parent to make sure the invalidate request goes 3939 // through 3940 final boolean drawAnimation = (child.mPrivateFlags & DRAW_ANIMATION) == DRAW_ANIMATION; 3941 3942 //noinspection PointlessBooleanExpression 3943 if (!HardwareRenderer.RENDER_DIRTY_REGIONS) { 3944 if (dirty == null) { 3945 if (child.mLayerType != LAYER_TYPE_NONE) { 3946 mPrivateFlags |= INVALIDATED; 3947 mPrivateFlags &= ~DRAWING_CACHE_VALID; 3948 child.mLocalDirtyRect.setEmpty(); 3949 } 3950 do { 3951 View view = null; 3952 if (parent instanceof View) { 3953 view = (View) parent; 3954 if (view.mLayerType != LAYER_TYPE_NONE) { 3955 view.mLocalDirtyRect.setEmpty(); 3956 if (view.getParent() instanceof View) { 3957 final View grandParent = (View) view.getParent(); 3958 grandParent.mPrivateFlags |= INVALIDATED; 3959 grandParent.mPrivateFlags &= ~DRAWING_CACHE_VALID; 3960 } 3961 } 3962 if ((view.mPrivateFlags & DIRTY_MASK) != 0) { 3963 // already marked dirty - we're done 3964 break; 3965 } 3966 } 3967 3968 if (drawAnimation) { 3969 if (view != null) { 3970 view.mPrivateFlags |= DRAW_ANIMATION; 3971 } else if (parent instanceof ViewRootImpl) { 3972 ((ViewRootImpl) parent).mIsAnimating = true; 3973 } 3974 } 3975 3976 if (parent instanceof ViewRootImpl) { 3977 ((ViewRootImpl) parent).invalidate(); 3978 parent = null; 3979 } else if (view != null) { 3980 if ((view.mPrivateFlags & DRAWN) == DRAWN || 3981 (view.mPrivateFlags & DRAWING_CACHE_VALID) == DRAWING_CACHE_VALID) { 3982 view.mPrivateFlags &= ~DRAWING_CACHE_VALID; 3983 view.mPrivateFlags |= DIRTY; 3984 parent = view.mParent; 3985 } else { 3986 parent = null; 3987 } 3988 } 3989 } while (parent != null); 3990 } 3991 3992 return; 3993 } 3994 3995 // Check whether the child that requests the invalidate is fully opaque 3996 // Views being animated or transformed are not considered opaque because we may 3997 // be invalidating their old position and need the parent to paint behind them. 3998 Matrix childMatrix = child.getMatrix(); 3999 final boolean isOpaque = child.isOpaque() && !drawAnimation && 4000 child.getAnimation() == null && childMatrix.isIdentity(); 4001 // Mark the child as dirty, using the appropriate flag 4002 // Make sure we do not set both flags at the same time 4003 int opaqueFlag = isOpaque ? DIRTY_OPAQUE : DIRTY; 4004 4005 if (child.mLayerType != LAYER_TYPE_NONE) { 4006 mPrivateFlags |= INVALIDATED; 4007 mPrivateFlags &= ~DRAWING_CACHE_VALID; 4008 child.mLocalDirtyRect.union(dirty); 4009 } 4010 4011 final int[] location = attachInfo.mInvalidateChildLocation; 4012 location[CHILD_LEFT_INDEX] = child.mLeft; 4013 location[CHILD_TOP_INDEX] = child.mTop; 4014 if (!childMatrix.isIdentity()) { 4015 RectF boundingRect = attachInfo.mTmpTransformRect; 4016 boundingRect.set(dirty); 4017 //boundingRect.inset(-0.5f, -0.5f); 4018 childMatrix.mapRect(boundingRect); 4019 dirty.set((int) (boundingRect.left - 0.5f), 4020 (int) (boundingRect.top - 0.5f), 4021 (int) (boundingRect.right + 0.5f), 4022 (int) (boundingRect.bottom + 0.5f)); 4023 } 4024 4025 do { 4026 View view = null; 4027 if (parent instanceof View) { 4028 view = (View) parent; 4029 if (view.mLayerType != LAYER_TYPE_NONE && 4030 view.getParent() instanceof View) { 4031 final View grandParent = (View) view.getParent(); 4032 grandParent.mPrivateFlags |= INVALIDATED; 4033 grandParent.mPrivateFlags &= ~DRAWING_CACHE_VALID; 4034 } 4035 } 4036 4037 if (drawAnimation) { 4038 if (view != null) { 4039 view.mPrivateFlags |= DRAW_ANIMATION; 4040 } else if (parent instanceof ViewRootImpl) { 4041 ((ViewRootImpl) parent).mIsAnimating = true; 4042 } 4043 } 4044 4045 // If the parent is dirty opaque or not dirty, mark it dirty with the opaque 4046 // flag coming from the child that initiated the invalidate 4047 if (view != null) { 4048 if ((view.mViewFlags & FADING_EDGE_MASK) != 0 && 4049 view.getSolidColor() == 0) { 4050 opaqueFlag = DIRTY; 4051 } 4052 if ((view.mPrivateFlags & DIRTY_MASK) != DIRTY) { 4053 view.mPrivateFlags = (view.mPrivateFlags & ~DIRTY_MASK) | opaqueFlag; 4054 } 4055 } 4056 4057 parent = parent.invalidateChildInParent(location, dirty); 4058 if (view != null) { 4059 // Account for transform on current parent 4060 Matrix m = view.getMatrix(); 4061 if (!m.isIdentity()) { 4062 RectF boundingRect = attachInfo.mTmpTransformRect; 4063 boundingRect.set(dirty); 4064 m.mapRect(boundingRect); 4065 dirty.set((int) (boundingRect.left - 0.5f), 4066 (int) (boundingRect.top - 0.5f), 4067 (int) (boundingRect.right + 0.5f), 4068 (int) (boundingRect.bottom + 0.5f)); 4069 } 4070 } 4071 } while (parent != null); 4072 } 4073 } 4074 4075 /** 4076 * Don't call or override this method. It is used for the implementation of 4077 * the view hierarchy. 4078 * 4079 * This implementation returns null if this ViewGroup does not have a parent, 4080 * if this ViewGroup is already fully invalidated or if the dirty rectangle 4081 * does not intersect with this ViewGroup's bounds. 4082 */ 4083 public ViewParent invalidateChildInParent(final int[] location, final Rect dirty) { 4084 if (ViewDebug.TRACE_HIERARCHY) { 4085 ViewDebug.trace(this, ViewDebug.HierarchyTraceType.INVALIDATE_CHILD_IN_PARENT); 4086 } 4087 4088 if ((mPrivateFlags & DRAWN) == DRAWN || 4089 (mPrivateFlags & DRAWING_CACHE_VALID) == DRAWING_CACHE_VALID) { 4090 if ((mGroupFlags & (FLAG_OPTIMIZE_INVALIDATE | FLAG_ANIMATION_DONE)) != 4091 FLAG_OPTIMIZE_INVALIDATE) { 4092 dirty.offset(location[CHILD_LEFT_INDEX] - mScrollX, 4093 location[CHILD_TOP_INDEX] - mScrollY); 4094 4095 final int left = mLeft; 4096 final int top = mTop; 4097 4098 if ((mGroupFlags & FLAG_CLIP_CHILDREN) != FLAG_CLIP_CHILDREN || 4099 dirty.intersect(0, 0, mRight - left, mBottom - top) || 4100 (mPrivateFlags & DRAW_ANIMATION) == DRAW_ANIMATION) { 4101 mPrivateFlags &= ~DRAWING_CACHE_VALID; 4102 4103 location[CHILD_LEFT_INDEX] = left; 4104 location[CHILD_TOP_INDEX] = top; 4105 4106 if (mLayerType != LAYER_TYPE_NONE) { 4107 mLocalDirtyRect.union(dirty); 4108 } 4109 4110 return mParent; 4111 } 4112 } else { 4113 mPrivateFlags &= ~DRAWN & ~DRAWING_CACHE_VALID; 4114 4115 location[CHILD_LEFT_INDEX] = mLeft; 4116 location[CHILD_TOP_INDEX] = mTop; 4117 if ((mGroupFlags & FLAG_CLIP_CHILDREN) == FLAG_CLIP_CHILDREN) { 4118 dirty.set(0, 0, mRight - mLeft, mBottom - mTop); 4119 } else { 4120 // in case the dirty rect extends outside the bounds of this container 4121 dirty.union(0, 0, mRight - mLeft, mBottom - mTop); 4122 } 4123 4124 if (mLayerType != LAYER_TYPE_NONE) { 4125 mLocalDirtyRect.union(dirty); 4126 } 4127 4128 return mParent; 4129 } 4130 } 4131 4132 return null; 4133 } 4134 4135 /** 4136 * Quick invalidation method called by View.invalidateViewProperty. This doesn't set the 4137 * DRAWN flags and doesn't handle the Animation logic that the default invalidation methods 4138 * do; all we want to do here is schedule a traversal with the appropriate dirty rect. 4139 * 4140 * @hide 4141 */ 4142 public void invalidateChildFast(View child, final Rect dirty) { 4143 ViewParent parent = this; 4144 4145 final AttachInfo attachInfo = mAttachInfo; 4146 if (attachInfo != null) { 4147 if (child.mLayerType != LAYER_TYPE_NONE) { 4148 child.mLocalDirtyRect.union(dirty); 4149 } 4150 4151 int left = child.mLeft; 4152 int top = child.mTop; 4153 if (!child.getMatrix().isIdentity()) { 4154 child.transformRect(dirty); 4155 } 4156 4157 do { 4158 if (parent instanceof ViewGroup) { 4159 ViewGroup parentVG = (ViewGroup) parent; 4160 if (parentVG.mLayerType != LAYER_TYPE_NONE) { 4161 // Layered parents should be recreated, not just re-issued 4162 parentVG.invalidate(); 4163 parent = null; 4164 } else { 4165 parent = parentVG.invalidateChildInParentFast(left, top, dirty); 4166 left = parentVG.mLeft; 4167 top = parentVG.mTop; 4168 } 4169 } else { 4170 // Reached the top; this calls into the usual invalidate method in 4171 // ViewRootImpl, which schedules a traversal 4172 final int[] location = attachInfo.mInvalidateChildLocation; 4173 location[0] = left; 4174 location[1] = top; 4175 parent = parent.invalidateChildInParent(location, dirty); 4176 } 4177 } while (parent != null); 4178 } 4179 } 4180 4181 /** 4182 * Quick invalidation method that simply transforms the dirty rect into the parent's 4183 * coordinate system, pruning the invalidation if the parent has already been invalidated. 4184 */ 4185 private ViewParent invalidateChildInParentFast(int left, int top, final Rect dirty) { 4186 if ((mPrivateFlags & DRAWN) == DRAWN || 4187 (mPrivateFlags & DRAWING_CACHE_VALID) == DRAWING_CACHE_VALID) { 4188 dirty.offset(left - mScrollX, top - mScrollY); 4189 4190 if ((mGroupFlags & FLAG_CLIP_CHILDREN) == 0 || 4191 dirty.intersect(0, 0, mRight - mLeft, mBottom - mTop)) { 4192 4193 if (mLayerType != LAYER_TYPE_NONE) { 4194 mLocalDirtyRect.union(dirty); 4195 } 4196 if (!getMatrix().isIdentity()) { 4197 transformRect(dirty); 4198 } 4199 4200 return mParent; 4201 } 4202 } 4203 4204 return null; 4205 } 4206 4207 /** 4208 * Offset a rectangle that is in a descendant's coordinate 4209 * space into our coordinate space. 4210 * @param descendant A descendant of this view 4211 * @param rect A rectangle defined in descendant's coordinate space. 4212 */ 4213 public final void offsetDescendantRectToMyCoords(View descendant, Rect rect) { 4214 offsetRectBetweenParentAndChild(descendant, rect, true, false); 4215 } 4216 4217 /** 4218 * Offset a rectangle that is in our coordinate space into an ancestor's 4219 * coordinate space. 4220 * @param descendant A descendant of this view 4221 * @param rect A rectangle defined in descendant's coordinate space. 4222 */ 4223 public final void offsetRectIntoDescendantCoords(View descendant, Rect rect) { 4224 offsetRectBetweenParentAndChild(descendant, rect, false, false); 4225 } 4226 4227 /** 4228 * Helper method that offsets a rect either from parent to descendant or 4229 * descendant to parent. 4230 */ 4231 void offsetRectBetweenParentAndChild(View descendant, Rect rect, 4232 boolean offsetFromChildToParent, boolean clipToBounds) { 4233 4234 // already in the same coord system :) 4235 if (descendant == this) { 4236 return; 4237 } 4238 4239 ViewParent theParent = descendant.mParent; 4240 4241 // search and offset up to the parent 4242 while ((theParent != null) 4243 && (theParent instanceof View) 4244 && (theParent != this)) { 4245 4246 if (offsetFromChildToParent) { 4247 rect.offset(descendant.mLeft - descendant.mScrollX, 4248 descendant.mTop - descendant.mScrollY); 4249 if (clipToBounds) { 4250 View p = (View) theParent; 4251 rect.intersect(0, 0, p.mRight - p.mLeft, p.mBottom - p.mTop); 4252 } 4253 } else { 4254 if (clipToBounds) { 4255 View p = (View) theParent; 4256 rect.intersect(0, 0, p.mRight - p.mLeft, p.mBottom - p.mTop); 4257 } 4258 rect.offset(descendant.mScrollX - descendant.mLeft, 4259 descendant.mScrollY - descendant.mTop); 4260 } 4261 4262 descendant = (View) theParent; 4263 theParent = descendant.mParent; 4264 } 4265 4266 // now that we are up to this view, need to offset one more time 4267 // to get into our coordinate space 4268 if (theParent == this) { 4269 if (offsetFromChildToParent) { 4270 rect.offset(descendant.mLeft - descendant.mScrollX, 4271 descendant.mTop - descendant.mScrollY); 4272 } else { 4273 rect.offset(descendant.mScrollX - descendant.mLeft, 4274 descendant.mScrollY - descendant.mTop); 4275 } 4276 } else { 4277 throw new IllegalArgumentException("parameter must be a descendant of this view"); 4278 } 4279 } 4280 4281 /** 4282 * Offset the vertical location of all children of this view by the specified number of pixels. 4283 * 4284 * @param offset the number of pixels to offset 4285 * 4286 * @hide 4287 */ 4288 public void offsetChildrenTopAndBottom(int offset) { 4289 final int count = mChildrenCount; 4290 final View[] children = mChildren; 4291 4292 for (int i = 0; i < count; i++) { 4293 final View v = children[i]; 4294 v.mTop += offset; 4295 v.mBottom += offset; 4296 if (v.mDisplayList != null) { 4297 v.mDisplayList.offsetTopBottom(offset); 4298 invalidateViewProperty(false, false); 4299 } 4300 } 4301 } 4302 4303 /** 4304 * {@inheritDoc} 4305 */ 4306 public boolean getChildVisibleRect(View child, Rect r, android.graphics.Point offset) { 4307 // It doesn't make a whole lot of sense to call this on a view that isn't attached, 4308 // but for some simple tests it can be useful. If we don't have attach info this 4309 // will allocate memory. 4310 final RectF rect = mAttachInfo != null ? mAttachInfo.mTmpTransformRect : new RectF(); 4311 rect.set(r); 4312 4313 if (!child.hasIdentityMatrix()) { 4314 child.getMatrix().mapRect(rect); 4315 } 4316 4317 int dx = child.mLeft - mScrollX; 4318 int dy = child.mTop - mScrollY; 4319 4320 rect.offset(dx, dy); 4321 4322 if (offset != null) { 4323 if (!child.hasIdentityMatrix()) { 4324 float[] position = mAttachInfo != null ? mAttachInfo.mTmpTransformLocation 4325 : new float[2]; 4326 position[0] = offset.x; 4327 position[1] = offset.y; 4328 child.getMatrix().mapPoints(position); 4329 offset.x = (int) (position[0] + 0.5f); 4330 offset.y = (int) (position[1] + 0.5f); 4331 } 4332 offset.x += dx; 4333 offset.y += dy; 4334 } 4335 4336 if (rect.intersect(0, 0, mRight - mLeft, mBottom - mTop)) { 4337 if (mParent == null) return true; 4338 r.set((int) (rect.left + 0.5f), (int) (rect.top + 0.5f), 4339 (int) (rect.right + 0.5f), (int) (rect.bottom + 0.5f)); 4340 return mParent.getChildVisibleRect(this, r, offset); 4341 } 4342 4343 return false; 4344 } 4345 4346 /** 4347 * {@inheritDoc} 4348 */ 4349 @Override 4350 public final void layout(int l, int t, int r, int b) { 4351 if (mTransition == null || !mTransition.isChangingLayout()) { 4352 if (mTransition != null) { 4353 mTransition.layoutChange(this); 4354 } 4355 super.layout(l, t, r, b); 4356 } else { 4357 // record the fact that we noop'd it; request layout when transition finishes 4358 mLayoutSuppressed = true; 4359 } 4360 } 4361 4362 /** 4363 * {@inheritDoc} 4364 */ 4365 @Override 4366 protected abstract void onLayout(boolean changed, 4367 int l, int t, int r, int b); 4368 4369 /** 4370 * Indicates whether the view group has the ability to animate its children 4371 * after the first layout. 4372 * 4373 * @return true if the children can be animated, false otherwise 4374 */ 4375 protected boolean canAnimate() { 4376 return mLayoutAnimationController != null; 4377 } 4378 4379 /** 4380 * Runs the layout animation. Calling this method triggers a relayout of 4381 * this view group. 4382 */ 4383 public void startLayoutAnimation() { 4384 if (mLayoutAnimationController != null) { 4385 mGroupFlags |= FLAG_RUN_ANIMATION; 4386 requestLayout(); 4387 } 4388 } 4389 4390 /** 4391 * Schedules the layout animation to be played after the next layout pass 4392 * of this view group. This can be used to restart the layout animation 4393 * when the content of the view group changes or when the activity is 4394 * paused and resumed. 4395 */ 4396 public void scheduleLayoutAnimation() { 4397 mGroupFlags |= FLAG_RUN_ANIMATION; 4398 } 4399 4400 /** 4401 * Sets the layout animation controller used to animate the group's 4402 * children after the first layout. 4403 * 4404 * @param controller the animation controller 4405 */ 4406 public void setLayoutAnimation(LayoutAnimationController controller) { 4407 mLayoutAnimationController = controller; 4408 if (mLayoutAnimationController != null) { 4409 mGroupFlags |= FLAG_RUN_ANIMATION; 4410 } 4411 } 4412 4413 /** 4414 * Returns the layout animation controller used to animate the group's 4415 * children. 4416 * 4417 * @return the current animation controller 4418 */ 4419 public LayoutAnimationController getLayoutAnimation() { 4420 return mLayoutAnimationController; 4421 } 4422 4423 /** 4424 * Indicates whether the children's drawing cache is used during a layout 4425 * animation. By default, the drawing cache is enabled but this will prevent 4426 * nested layout animations from working. To nest animations, you must disable 4427 * the cache. 4428 * 4429 * @return true if the animation cache is enabled, false otherwise 4430 * 4431 * @see #setAnimationCacheEnabled(boolean) 4432 * @see View#setDrawingCacheEnabled(boolean) 4433 */ 4434 @ViewDebug.ExportedProperty 4435 public boolean isAnimationCacheEnabled() { 4436 return (mGroupFlags & FLAG_ANIMATION_CACHE) == FLAG_ANIMATION_CACHE; 4437 } 4438 4439 /** 4440 * Enables or disables the children's drawing cache during a layout animation. 4441 * By default, the drawing cache is enabled but this will prevent nested 4442 * layout animations from working. To nest animations, you must disable the 4443 * cache. 4444 * 4445 * @param enabled true to enable the animation cache, false otherwise 4446 * 4447 * @see #isAnimationCacheEnabled() 4448 * @see View#setDrawingCacheEnabled(boolean) 4449 */ 4450 public void setAnimationCacheEnabled(boolean enabled) { 4451 setBooleanFlag(FLAG_ANIMATION_CACHE, enabled); 4452 } 4453 4454 /** 4455 * Indicates whether this ViewGroup will always try to draw its children using their 4456 * drawing cache. By default this property is enabled. 4457 * 4458 * @return true if the animation cache is enabled, false otherwise 4459 * 4460 * @see #setAlwaysDrawnWithCacheEnabled(boolean) 4461 * @see #setChildrenDrawnWithCacheEnabled(boolean) 4462 * @see View#setDrawingCacheEnabled(boolean) 4463 */ 4464 @ViewDebug.ExportedProperty(category = "drawing") 4465 public boolean isAlwaysDrawnWithCacheEnabled() { 4466 return (mGroupFlags & FLAG_ALWAYS_DRAWN_WITH_CACHE) == FLAG_ALWAYS_DRAWN_WITH_CACHE; 4467 } 4468 4469 /** 4470 * Indicates whether this ViewGroup will always try to draw its children using their 4471 * drawing cache. This property can be set to true when the cache rendering is 4472 * slightly different from the children's normal rendering. Renderings can be different, 4473 * for instance, when the cache's quality is set to low. 4474 * 4475 * When this property is disabled, the ViewGroup will use the drawing cache of its 4476 * children only when asked to. It's usually the task of subclasses to tell ViewGroup 4477 * when to start using the drawing cache and when to stop using it. 4478 * 4479 * @param always true to always draw with the drawing cache, false otherwise 4480 * 4481 * @see #isAlwaysDrawnWithCacheEnabled() 4482 * @see #setChildrenDrawnWithCacheEnabled(boolean) 4483 * @see View#setDrawingCacheEnabled(boolean) 4484 * @see View#setDrawingCacheQuality(int) 4485 */ 4486 public void setAlwaysDrawnWithCacheEnabled(boolean always) { 4487 setBooleanFlag(FLAG_ALWAYS_DRAWN_WITH_CACHE, always); 4488 } 4489 4490 /** 4491 * Indicates whether the ViewGroup is currently drawing its children using 4492 * their drawing cache. 4493 * 4494 * @return true if children should be drawn with their cache, false otherwise 4495 * 4496 * @see #setAlwaysDrawnWithCacheEnabled(boolean) 4497 * @see #setChildrenDrawnWithCacheEnabled(boolean) 4498 */ 4499 @ViewDebug.ExportedProperty(category = "drawing") 4500 protected boolean isChildrenDrawnWithCacheEnabled() { 4501 return (mGroupFlags & FLAG_CHILDREN_DRAWN_WITH_CACHE) == FLAG_CHILDREN_DRAWN_WITH_CACHE; 4502 } 4503 4504 /** 4505 * Tells the ViewGroup to draw its children using their drawing cache. This property 4506 * is ignored when {@link #isAlwaysDrawnWithCacheEnabled()} is true. A child's drawing cache 4507 * will be used only if it has been enabled. 4508 * 4509 * Subclasses should call this method to start and stop using the drawing cache when 4510 * they perform performance sensitive operations, like scrolling or animating. 4511 * 4512 * @param enabled true if children should be drawn with their cache, false otherwise 4513 * 4514 * @see #setAlwaysDrawnWithCacheEnabled(boolean) 4515 * @see #isChildrenDrawnWithCacheEnabled() 4516 */ 4517 protected void setChildrenDrawnWithCacheEnabled(boolean enabled) { 4518 setBooleanFlag(FLAG_CHILDREN_DRAWN_WITH_CACHE, enabled); 4519 } 4520 4521 /** 4522 * Indicates whether the ViewGroup is drawing its children in the order defined by 4523 * {@link #getChildDrawingOrder(int, int)}. 4524 * 4525 * @return true if children drawing order is defined by {@link #getChildDrawingOrder(int, int)}, 4526 * false otherwise 4527 * 4528 * @see #setChildrenDrawingOrderEnabled(boolean) 4529 * @see #getChildDrawingOrder(int, int) 4530 */ 4531 @ViewDebug.ExportedProperty(category = "drawing") 4532 protected boolean isChildrenDrawingOrderEnabled() { 4533 return (mGroupFlags & FLAG_USE_CHILD_DRAWING_ORDER) == FLAG_USE_CHILD_DRAWING_ORDER; 4534 } 4535 4536 /** 4537 * Tells the ViewGroup whether to draw its children in the order defined by the method 4538 * {@link #getChildDrawingOrder(int, int)}. 4539 * 4540 * @param enabled true if the order of the children when drawing is determined by 4541 * {@link #getChildDrawingOrder(int, int)}, false otherwise 4542 * 4543 * @see #isChildrenDrawingOrderEnabled() 4544 * @see #getChildDrawingOrder(int, int) 4545 */ 4546 protected void setChildrenDrawingOrderEnabled(boolean enabled) { 4547 setBooleanFlag(FLAG_USE_CHILD_DRAWING_ORDER, enabled); 4548 } 4549 4550 private void setBooleanFlag(int flag, boolean value) { 4551 if (value) { 4552 mGroupFlags |= flag; 4553 } else { 4554 mGroupFlags &= ~flag; 4555 } 4556 } 4557 4558 /** 4559 * Returns an integer indicating what types of drawing caches are kept in memory. 4560 * 4561 * @see #setPersistentDrawingCache(int) 4562 * @see #setAnimationCacheEnabled(boolean) 4563 * 4564 * @return one or a combination of {@link #PERSISTENT_NO_CACHE}, 4565 * {@link #PERSISTENT_ANIMATION_CACHE}, {@link #PERSISTENT_SCROLLING_CACHE} 4566 * and {@link #PERSISTENT_ALL_CACHES} 4567 */ 4568 @ViewDebug.ExportedProperty(category = "drawing", mapping = { 4569 @ViewDebug.IntToString(from = PERSISTENT_NO_CACHE, to = "NONE"), 4570 @ViewDebug.IntToString(from = PERSISTENT_ANIMATION_CACHE, to = "ANIMATION"), 4571 @ViewDebug.IntToString(from = PERSISTENT_SCROLLING_CACHE, to = "SCROLLING"), 4572 @ViewDebug.IntToString(from = PERSISTENT_ALL_CACHES, to = "ALL") 4573 }) 4574 public int getPersistentDrawingCache() { 4575 return mPersistentDrawingCache; 4576 } 4577 4578 /** 4579 * Indicates what types of drawing caches should be kept in memory after 4580 * they have been created. 4581 * 4582 * @see #getPersistentDrawingCache() 4583 * @see #setAnimationCacheEnabled(boolean) 4584 * 4585 * @param drawingCacheToKeep one or a combination of {@link #PERSISTENT_NO_CACHE}, 4586 * {@link #PERSISTENT_ANIMATION_CACHE}, {@link #PERSISTENT_SCROLLING_CACHE} 4587 * and {@link #PERSISTENT_ALL_CACHES} 4588 */ 4589 public void setPersistentDrawingCache(int drawingCacheToKeep) { 4590 mPersistentDrawingCache = drawingCacheToKeep & PERSISTENT_ALL_CACHES; 4591 } 4592 4593 /** 4594 * Returns the basis of alignment during the layout of this view group: 4595 * either {@link #COMPONENT_BOUNDS} or {@link #LAYOUT_BOUNDS}. 4596 * 4597 * @return the layout mode to use during layout operations 4598 * 4599 * @see #setLayoutMode(int) 4600 */ 4601 public int getLayoutMode() { 4602 if (mLayoutMode == UNDEFINED_LAYOUT_MODE) { 4603 ViewParent parent = getParent(); 4604 if (parent instanceof ViewGroup) { 4605 ViewGroup viewGroup = (ViewGroup) parent; 4606 return viewGroup.getLayoutMode(); 4607 } else { 4608 int targetSdkVersion = mContext.getApplicationInfo().targetSdkVersion; 4609 boolean preJellyBean = targetSdkVersion < Build.VERSION_CODES.JELLY_BEAN; 4610 return preJellyBean ? COMPONENT_BOUNDS : LAYOUT_BOUNDS; 4611 } 4612 4613 } 4614 return mLayoutMode; 4615 } 4616 4617 /** 4618 * Sets the basis of alignment during alignment of this view group. 4619 * Valid values are either {@link #COMPONENT_BOUNDS} or {@link #LAYOUT_BOUNDS}. 4620 * <p> 4621 * The default is to query the property of the parent if this view group has a parent. 4622 * If this ViewGroup is the root of the view hierarchy the default 4623 * value is {@link #LAYOUT_BOUNDS} for target SDK's greater than JellyBean, 4624 * {@link #LAYOUT_BOUNDS} otherwise. 4625 * 4626 * @param layoutMode the layout mode to use during layout operations 4627 * 4628 * @see #getLayoutMode() 4629 */ 4630 public void setLayoutMode(int layoutMode) { 4631 if (mLayoutMode != layoutMode) { 4632 mLayoutMode = layoutMode; 4633 requestLayout(); 4634 } 4635 } 4636 4637 /** 4638 * Returns a new set of layout parameters based on the supplied attributes set. 4639 * 4640 * @param attrs the attributes to build the layout parameters from 4641 * 4642 * @return an instance of {@link android.view.ViewGroup.LayoutParams} or one 4643 * of its descendants 4644 */ 4645 public LayoutParams generateLayoutParams(AttributeSet attrs) { 4646 return new LayoutParams(getContext(), attrs); 4647 } 4648 4649 /** 4650 * Returns a safe set of layout parameters based on the supplied layout params. 4651 * When a ViewGroup is passed a View whose layout params do not pass the test of 4652 * {@link #checkLayoutParams(android.view.ViewGroup.LayoutParams)}, this method 4653 * is invoked. This method should return a new set of layout params suitable for 4654 * this ViewGroup, possibly by copying the appropriate attributes from the 4655 * specified set of layout params. 4656 * 4657 * @param p The layout parameters to convert into a suitable set of layout parameters 4658 * for this ViewGroup. 4659 * 4660 * @return an instance of {@link android.view.ViewGroup.LayoutParams} or one 4661 * of its descendants 4662 */ 4663 protected LayoutParams generateLayoutParams(ViewGroup.LayoutParams p) { 4664 return p; 4665 } 4666 4667 /** 4668 * Returns a set of default layout parameters. These parameters are requested 4669 * when the View passed to {@link #addView(View)} has no layout parameters 4670 * already set. If null is returned, an exception is thrown from addView. 4671 * 4672 * @return a set of default layout parameters or null 4673 */ 4674 protected LayoutParams generateDefaultLayoutParams() { 4675 return new LayoutParams(LayoutParams.WRAP_CONTENT, LayoutParams.WRAP_CONTENT); 4676 } 4677 4678 /** 4679 * @hide 4680 */ 4681 @Override 4682 protected boolean dispatchConsistencyCheck(int consistency) { 4683 boolean result = super.dispatchConsistencyCheck(consistency); 4684 4685 final int count = mChildrenCount; 4686 final View[] children = mChildren; 4687 for (int i = 0; i < count; i++) { 4688 if (!children[i].dispatchConsistencyCheck(consistency)) result = false; 4689 } 4690 4691 return result; 4692 } 4693 4694 /** 4695 * @hide 4696 */ 4697 @Override 4698 protected boolean onConsistencyCheck(int consistency) { 4699 boolean result = super.onConsistencyCheck(consistency); 4700 4701 final boolean checkLayout = (consistency & ViewDebug.CONSISTENCY_LAYOUT) != 0; 4702 final boolean checkDrawing = (consistency & ViewDebug.CONSISTENCY_DRAWING) != 0; 4703 4704 if (checkLayout) { 4705 final int count = mChildrenCount; 4706 final View[] children = mChildren; 4707 for (int i = 0; i < count; i++) { 4708 if (children[i].getParent() != this) { 4709 result = false; 4710 android.util.Log.d(ViewDebug.CONSISTENCY_LOG_TAG, 4711 "View " + children[i] + " has no parent/a parent that is not " + this); 4712 } 4713 } 4714 } 4715 4716 if (checkDrawing) { 4717 // If this group is dirty, check that the parent is dirty as well 4718 if ((mPrivateFlags & DIRTY_MASK) != 0) { 4719 final ViewParent parent = getParent(); 4720 if (parent != null && !(parent instanceof ViewRootImpl)) { 4721 if ((((View) parent).mPrivateFlags & DIRTY_MASK) == 0) { 4722 result = false; 4723 android.util.Log.d(ViewDebug.CONSISTENCY_LOG_TAG, 4724 "ViewGroup " + this + " is dirty but its parent is not: " + this); 4725 } 4726 } 4727 } 4728 } 4729 4730 return result; 4731 } 4732 4733 /** 4734 * {@inheritDoc} 4735 */ 4736 @Override 4737 protected void debug(int depth) { 4738 super.debug(depth); 4739 String output; 4740 4741 if (mFocused != null) { 4742 output = debugIndent(depth); 4743 output += "mFocused"; 4744 Log.d(VIEW_LOG_TAG, output); 4745 } 4746 if (mChildrenCount != 0) { 4747 output = debugIndent(depth); 4748 output += "{"; 4749 Log.d(VIEW_LOG_TAG, output); 4750 } 4751 int count = mChildrenCount; 4752 for (int i = 0; i < count; i++) { 4753 View child = mChildren[i]; 4754 child.debug(depth + 1); 4755 } 4756 4757 if (mChildrenCount != 0) { 4758 output = debugIndent(depth); 4759 output += "}"; 4760 Log.d(VIEW_LOG_TAG, output); 4761 } 4762 } 4763 4764 /** 4765 * Returns the position in the group of the specified child view. 4766 * 4767 * @param child the view for which to get the position 4768 * @return a positive integer representing the position of the view in the 4769 * group, or -1 if the view does not exist in the group 4770 */ 4771 public int indexOfChild(View child) { 4772 final int count = mChildrenCount; 4773 final View[] children = mChildren; 4774 for (int i = 0; i < count; i++) { 4775 if (children[i] == child) { 4776 return i; 4777 } 4778 } 4779 return -1; 4780 } 4781 4782 /** 4783 * Returns the number of children in the group. 4784 * 4785 * @return a positive integer representing the number of children in 4786 * the group 4787 */ 4788 public int getChildCount() { 4789 return mChildrenCount; 4790 } 4791 4792 /** 4793 * Returns the view at the specified position in the group. 4794 * 4795 * @param index the position at which to get the view from 4796 * @return the view at the specified position or null if the position 4797 * does not exist within the group 4798 */ 4799 public View getChildAt(int index) { 4800 if (index < 0 || index >= mChildrenCount) { 4801 return null; 4802 } 4803 return mChildren[index]; 4804 } 4805 4806 /** 4807 * Ask all of the children of this view to measure themselves, taking into 4808 * account both the MeasureSpec requirements for this view and its padding. 4809 * We skip children that are in the GONE state The heavy lifting is done in 4810 * getChildMeasureSpec. 4811 * 4812 * @param widthMeasureSpec The width requirements for this view 4813 * @param heightMeasureSpec The height requirements for this view 4814 */ 4815 protected void measureChildren(int widthMeasureSpec, int heightMeasureSpec) { 4816 final int size = mChildrenCount; 4817 final View[] children = mChildren; 4818 for (int i = 0; i < size; ++i) { 4819 final View child = children[i]; 4820 if ((child.mViewFlags & VISIBILITY_MASK) != GONE) { 4821 measureChild(child, widthMeasureSpec, heightMeasureSpec); 4822 } 4823 } 4824 } 4825 4826 /** 4827 * Ask one of the children of this view to measure itself, taking into 4828 * account both the MeasureSpec requirements for this view and its padding. 4829 * The heavy lifting is done in getChildMeasureSpec. 4830 * 4831 * @param child The child to measure 4832 * @param parentWidthMeasureSpec The width requirements for this view 4833 * @param parentHeightMeasureSpec The height requirements for this view 4834 */ 4835 protected void measureChild(View child, int parentWidthMeasureSpec, 4836 int parentHeightMeasureSpec) { 4837 final LayoutParams lp = child.getLayoutParams(); 4838 4839 final int childWidthMeasureSpec = getChildMeasureSpec(parentWidthMeasureSpec, 4840 mPaddingLeft + mPaddingRight, lp.width); 4841 final int childHeightMeasureSpec = getChildMeasureSpec(parentHeightMeasureSpec, 4842 mPaddingTop + mPaddingBottom, lp.height); 4843 4844 child.measure(childWidthMeasureSpec, childHeightMeasureSpec); 4845 } 4846 4847 /** 4848 * Ask one of the children of this view to measure itself, taking into 4849 * account both the MeasureSpec requirements for this view and its padding 4850 * and margins. The child must have MarginLayoutParams The heavy lifting is 4851 * done in getChildMeasureSpec. 4852 * 4853 * @param child The child to measure 4854 * @param parentWidthMeasureSpec The width requirements for this view 4855 * @param widthUsed Extra space that has been used up by the parent 4856 * horizontally (possibly by other children of the parent) 4857 * @param parentHeightMeasureSpec The height requirements for this view 4858 * @param heightUsed Extra space that has been used up by the parent 4859 * vertically (possibly by other children of the parent) 4860 */ 4861 protected void measureChildWithMargins(View child, 4862 int parentWidthMeasureSpec, int widthUsed, 4863 int parentHeightMeasureSpec, int heightUsed) { 4864 final MarginLayoutParams lp = (MarginLayoutParams) child.getLayoutParams(); 4865 4866 final int childWidthMeasureSpec = getChildMeasureSpec(parentWidthMeasureSpec, 4867 mPaddingLeft + mPaddingRight + lp.leftMargin + lp.rightMargin 4868 + widthUsed, lp.width); 4869 final int childHeightMeasureSpec = getChildMeasureSpec(parentHeightMeasureSpec, 4870 mPaddingTop + mPaddingBottom + lp.topMargin + lp.bottomMargin 4871 + heightUsed, lp.height); 4872 4873 child.measure(childWidthMeasureSpec, childHeightMeasureSpec); 4874 } 4875 4876 /** 4877 * Does the hard part of measureChildren: figuring out the MeasureSpec to 4878 * pass to a particular child. This method figures out the right MeasureSpec 4879 * for one dimension (height or width) of one child view. 4880 * 4881 * The goal is to combine information from our MeasureSpec with the 4882 * LayoutParams of the child to get the best possible results. For example, 4883 * if the this view knows its size (because its MeasureSpec has a mode of 4884 * EXACTLY), and the child has indicated in its LayoutParams that it wants 4885 * to be the same size as the parent, the parent should ask the child to 4886 * layout given an exact size. 4887 * 4888 * @param spec The requirements for this view 4889 * @param padding The padding of this view for the current dimension and 4890 * margins, if applicable 4891 * @param childDimension How big the child wants to be in the current 4892 * dimension 4893 * @return a MeasureSpec integer for the child 4894 */ 4895 public static int getChildMeasureSpec(int spec, int padding, int childDimension) { 4896 int specMode = MeasureSpec.getMode(spec); 4897 int specSize = MeasureSpec.getSize(spec); 4898 4899 int size = Math.max(0, specSize - padding); 4900 4901 int resultSize = 0; 4902 int resultMode = 0; 4903 4904 switch (specMode) { 4905 // Parent has imposed an exact size on us 4906 case MeasureSpec.EXACTLY: 4907 if (childDimension >= 0) { 4908 resultSize = childDimension; 4909 resultMode = MeasureSpec.EXACTLY; 4910 } else if (childDimension == LayoutParams.MATCH_PARENT) { 4911 // Child wants to be our size. So be it. 4912 resultSize = size; 4913 resultMode = MeasureSpec.EXACTLY; 4914 } else if (childDimension == LayoutParams.WRAP_CONTENT) { 4915 // Child wants to determine its own size. It can't be 4916 // bigger than us. 4917 resultSize = size; 4918 resultMode = MeasureSpec.AT_MOST; 4919 } 4920 break; 4921 4922 // Parent has imposed a maximum size on us 4923 case MeasureSpec.AT_MOST: 4924 if (childDimension >= 0) { 4925 // Child wants a specific size... so be it 4926 resultSize = childDimension; 4927 resultMode = MeasureSpec.EXACTLY; 4928 } else if (childDimension == LayoutParams.MATCH_PARENT) { 4929 // Child wants to be our size, but our size is not fixed. 4930 // Constrain child to not be bigger than us. 4931 resultSize = size; 4932 resultMode = MeasureSpec.AT_MOST; 4933 } else if (childDimension == LayoutParams.WRAP_CONTENT) { 4934 // Child wants to determine its own size. It can't be 4935 // bigger than us. 4936 resultSize = size; 4937 resultMode = MeasureSpec.AT_MOST; 4938 } 4939 break; 4940 4941 // Parent asked to see how big we want to be 4942 case MeasureSpec.UNSPECIFIED: 4943 if (childDimension >= 0) { 4944 // Child wants a specific size... let him have it 4945 resultSize = childDimension; 4946 resultMode = MeasureSpec.EXACTLY; 4947 } else if (childDimension == LayoutParams.MATCH_PARENT) { 4948 // Child wants to be our size... find out how big it should 4949 // be 4950 resultSize = 0; 4951 resultMode = MeasureSpec.UNSPECIFIED; 4952 } else if (childDimension == LayoutParams.WRAP_CONTENT) { 4953 // Child wants to determine its own size.... find out how 4954 // big it should be 4955 resultSize = 0; 4956 resultMode = MeasureSpec.UNSPECIFIED; 4957 } 4958 break; 4959 } 4960 return MeasureSpec.makeMeasureSpec(resultSize, resultMode); 4961 } 4962 4963 4964 /** 4965 * Removes any pending animations for views that have been removed. Call 4966 * this if you don't want animations for exiting views to stack up. 4967 */ 4968 public void clearDisappearingChildren() { 4969 if (mDisappearingChildren != null) { 4970 mDisappearingChildren.clear(); 4971 invalidate(); 4972 } 4973 } 4974 4975 /** 4976 * Add a view which is removed from mChildren but still needs animation 4977 * 4978 * @param v View to add 4979 */ 4980 private void addDisappearingView(View v) { 4981 ArrayList<View> disappearingChildren = mDisappearingChildren; 4982 4983 if (disappearingChildren == null) { 4984 disappearingChildren = mDisappearingChildren = new ArrayList<View>(); 4985 } 4986 4987 disappearingChildren.add(v); 4988 } 4989 4990 /** 4991 * Cleanup a view when its animation is done. This may mean removing it from 4992 * the list of disappearing views. 4993 * 4994 * @param view The view whose animation has finished 4995 * @param animation The animation, cannot be null 4996 */ 4997 void finishAnimatingView(final View view, Animation animation) { 4998 final ArrayList<View> disappearingChildren = mDisappearingChildren; 4999 if (disappearingChildren != null) { 5000 if (disappearingChildren.contains(view)) { 5001 disappearingChildren.remove(view); 5002 5003 if (view.mAttachInfo != null) { 5004 view.dispatchDetachedFromWindow(); 5005 } 5006 5007 view.clearAnimation(); 5008 mGroupFlags |= FLAG_INVALIDATE_REQUIRED; 5009 } 5010 } 5011 5012 if (animation != null && !animation.getFillAfter()) { 5013 view.clearAnimation(); 5014 } 5015 5016 if ((view.mPrivateFlags & ANIMATION_STARTED) == ANIMATION_STARTED) { 5017 view.onAnimationEnd(); 5018 // Should be performed by onAnimationEnd() but this avoid an infinite loop, 5019 // so we'd rather be safe than sorry 5020 view.mPrivateFlags &= ~ANIMATION_STARTED; 5021 // Draw one more frame after the animation is done 5022 mGroupFlags |= FLAG_INVALIDATE_REQUIRED; 5023 } 5024 } 5025 5026 /** 5027 * Utility function called by View during invalidation to determine whether a view that 5028 * is invisible or gone should still be invalidated because it is being transitioned (and 5029 * therefore still needs to be drawn). 5030 */ 5031 boolean isViewTransitioning(View view) { 5032 return (mTransitioningViews != null && mTransitioningViews.contains(view)); 5033 } 5034 5035 /** 5036 * This method tells the ViewGroup that the given View object, which should have this 5037 * ViewGroup as its parent, 5038 * should be kept around (re-displayed when the ViewGroup draws its children) even if it 5039 * is removed from its parent. This allows animations, such as those used by 5040 * {@link android.app.Fragment} and {@link android.animation.LayoutTransition} to animate 5041 * the removal of views. A call to this method should always be accompanied by a later call 5042 * to {@link #endViewTransition(View)}, such as after an animation on the View has finished, 5043 * so that the View finally gets removed. 5044 * 5045 * @param view The View object to be kept visible even if it gets removed from its parent. 5046 */ 5047 public void startViewTransition(View view) { 5048 if (view.mParent == this) { 5049 if (mTransitioningViews == null) { 5050 mTransitioningViews = new ArrayList<View>(); 5051 } 5052 mTransitioningViews.add(view); 5053 } 5054 } 5055 5056 /** 5057 * This method should always be called following an earlier call to 5058 * {@link #startViewTransition(View)}. The given View is finally removed from its parent 5059 * and will no longer be displayed. Note that this method does not perform the functionality 5060 * of removing a view from its parent; it just discontinues the display of a View that 5061 * has previously been removed. 5062 * 5063 * @return view The View object that has been removed but is being kept around in the visible 5064 * hierarchy by an earlier call to {@link #startViewTransition(View)}. 5065 */ 5066 public void endViewTransition(View view) { 5067 if (mTransitioningViews != null) { 5068 mTransitioningViews.remove(view); 5069 final ArrayList<View> disappearingChildren = mDisappearingChildren; 5070 if (disappearingChildren != null && disappearingChildren.contains(view)) { 5071 disappearingChildren.remove(view); 5072 if (mVisibilityChangingChildren != null && 5073 mVisibilityChangingChildren.contains(view)) { 5074 mVisibilityChangingChildren.remove(view); 5075 } else { 5076 if (view.mAttachInfo != null) { 5077 view.dispatchDetachedFromWindow(); 5078 } 5079 if (view.mParent != null) { 5080 view.mParent = null; 5081 } 5082 } 5083 invalidate(); 5084 } 5085 } 5086 } 5087 5088 private LayoutTransition.TransitionListener mLayoutTransitionListener = 5089 new LayoutTransition.TransitionListener() { 5090 @Override 5091 public void startTransition(LayoutTransition transition, ViewGroup container, 5092 View view, int transitionType) { 5093 // We only care about disappearing items, since we need special logic to keep 5094 // those items visible after they've been 'removed' 5095 if (transitionType == LayoutTransition.DISAPPEARING) { 5096 startViewTransition(view); 5097 } 5098 } 5099 5100 @Override 5101 public void endTransition(LayoutTransition transition, ViewGroup container, 5102 View view, int transitionType) { 5103 if (mLayoutSuppressed && !transition.isChangingLayout()) { 5104 requestLayout(); 5105 mLayoutSuppressed = false; 5106 } 5107 if (transitionType == LayoutTransition.DISAPPEARING && mTransitioningViews != null) { 5108 endViewTransition(view); 5109 } 5110 } 5111 }; 5112 5113 /** 5114 * {@inheritDoc} 5115 */ 5116 @Override 5117 public boolean gatherTransparentRegion(Region region) { 5118 // If no transparent regions requested, we are always opaque. 5119 final boolean meOpaque = (mPrivateFlags & View.REQUEST_TRANSPARENT_REGIONS) == 0; 5120 if (meOpaque && region == null) { 5121 // The caller doesn't care about the region, so stop now. 5122 return true; 5123 } 5124 super.gatherTransparentRegion(region); 5125 final View[] children = mChildren; 5126 final int count = mChildrenCount; 5127 boolean noneOfTheChildrenAreTransparent = true; 5128 for (int i = 0; i < count; i++) { 5129 final View child = children[i]; 5130 if ((child.mViewFlags & VISIBILITY_MASK) == VISIBLE || child.getAnimation() != null) { 5131 if (!child.gatherTransparentRegion(region)) { 5132 noneOfTheChildrenAreTransparent = false; 5133 } 5134 } 5135 } 5136 return meOpaque || noneOfTheChildrenAreTransparent; 5137 } 5138 5139 /** 5140 * {@inheritDoc} 5141 */ 5142 public void requestTransparentRegion(View child) { 5143 if (child != null) { 5144 child.mPrivateFlags |= View.REQUEST_TRANSPARENT_REGIONS; 5145 if (mParent != null) { 5146 mParent.requestTransparentRegion(this); 5147 } 5148 } 5149 } 5150 5151 5152 @Override 5153 protected boolean fitSystemWindows(Rect insets) { 5154 boolean done = super.fitSystemWindows(insets); 5155 if (!done) { 5156 final int count = mChildrenCount; 5157 final View[] children = mChildren; 5158 for (int i = 0; i < count; i++) { 5159 done = children[i].fitSystemWindows(insets); 5160 if (done) { 5161 break; 5162 } 5163 } 5164 } 5165 return done; 5166 } 5167 5168 /** 5169 * Returns the animation listener to which layout animation events are 5170 * sent. 5171 * 5172 * @return an {@link android.view.animation.Animation.AnimationListener} 5173 */ 5174 public Animation.AnimationListener getLayoutAnimationListener() { 5175 return mAnimationListener; 5176 } 5177 5178 @Override 5179 protected void drawableStateChanged() { 5180 super.drawableStateChanged(); 5181 5182 if ((mGroupFlags & FLAG_NOTIFY_CHILDREN_ON_DRAWABLE_STATE_CHANGE) != 0) { 5183 if ((mGroupFlags & FLAG_ADD_STATES_FROM_CHILDREN) != 0) { 5184 throw new IllegalStateException("addStateFromChildren cannot be enabled if a" 5185 + " child has duplicateParentState set to true"); 5186 } 5187 5188 final View[] children = mChildren; 5189 final int count = mChildrenCount; 5190 5191 for (int i = 0; i < count; i++) { 5192 final View child = children[i]; 5193 if ((child.mViewFlags & DUPLICATE_PARENT_STATE) != 0) { 5194 child.refreshDrawableState(); 5195 } 5196 } 5197 } 5198 } 5199 5200 @Override 5201 public void jumpDrawablesToCurrentState() { 5202 super.jumpDrawablesToCurrentState(); 5203 final View[] children = mChildren; 5204 final int count = mChildrenCount; 5205 for (int i = 0; i < count; i++) { 5206 children[i].jumpDrawablesToCurrentState(); 5207 } 5208 } 5209 5210 @Override 5211 protected int[] onCreateDrawableState(int extraSpace) { 5212 if ((mGroupFlags & FLAG_ADD_STATES_FROM_CHILDREN) == 0) { 5213 return super.onCreateDrawableState(extraSpace); 5214 } 5215 5216 int need = 0; 5217 int n = getChildCount(); 5218 for (int i = 0; i < n; i++) { 5219 int[] childState = getChildAt(i).getDrawableState(); 5220 5221 if (childState != null) { 5222 need += childState.length; 5223 } 5224 } 5225 5226 int[] state = super.onCreateDrawableState(extraSpace + need); 5227 5228 for (int i = 0; i < n; i++) { 5229 int[] childState = getChildAt(i).getDrawableState(); 5230 5231 if (childState != null) { 5232 state = mergeDrawableStates(state, childState); 5233 } 5234 } 5235 5236 return state; 5237 } 5238 5239 /** 5240 * Sets whether this ViewGroup's drawable states also include 5241 * its children's drawable states. This is used, for example, to 5242 * make a group appear to be focused when its child EditText or button 5243 * is focused. 5244 */ 5245 public void setAddStatesFromChildren(boolean addsStates) { 5246 if (addsStates) { 5247 mGroupFlags |= FLAG_ADD_STATES_FROM_CHILDREN; 5248 } else { 5249 mGroupFlags &= ~FLAG_ADD_STATES_FROM_CHILDREN; 5250 } 5251 5252 refreshDrawableState(); 5253 } 5254 5255 /** 5256 * Returns whether this ViewGroup's drawable states also include 5257 * its children's drawable states. This is used, for example, to 5258 * make a group appear to be focused when its child EditText or button 5259 * is focused. 5260 */ 5261 public boolean addStatesFromChildren() { 5262 return (mGroupFlags & FLAG_ADD_STATES_FROM_CHILDREN) != 0; 5263 } 5264 5265 /** 5266 * If {link #addStatesFromChildren} is true, refreshes this group's 5267 * drawable state (to include the states from its children). 5268 */ 5269 public void childDrawableStateChanged(View child) { 5270 if ((mGroupFlags & FLAG_ADD_STATES_FROM_CHILDREN) != 0) { 5271 refreshDrawableState(); 5272 } 5273 } 5274 5275 /** 5276 * Specifies the animation listener to which layout animation events must 5277 * be sent. Only 5278 * {@link android.view.animation.Animation.AnimationListener#onAnimationStart(Animation)} 5279 * and 5280 * {@link android.view.animation.Animation.AnimationListener#onAnimationEnd(Animation)} 5281 * are invoked. 5282 * 5283 * @param animationListener the layout animation listener 5284 */ 5285 public void setLayoutAnimationListener(Animation.AnimationListener animationListener) { 5286 mAnimationListener = animationListener; 5287 } 5288 5289 /** 5290 * This method is called by LayoutTransition when there are 'changing' animations that need 5291 * to start after the layout/setup phase. The request is forwarded to the ViewAncestor, who 5292 * starts all pending transitions prior to the drawing phase in the current traversal. 5293 * 5294 * @param transition The LayoutTransition to be started on the next traversal. 5295 * 5296 * @hide 5297 */ 5298 public void requestTransitionStart(LayoutTransition transition) { 5299 ViewRootImpl viewAncestor = getViewRootImpl(); 5300 if (viewAncestor != null) { 5301 viewAncestor.requestTransitionStart(transition); 5302 } 5303 } 5304 5305 @Override 5306 public void onResolvedLayoutDirectionReset() { 5307 // Take care of resetting the children resolution too 5308 final int count = getChildCount(); 5309 for (int i = 0; i < count; i++) { 5310 final View child = getChildAt(i); 5311 if (child.getLayoutDirection() == LAYOUT_DIRECTION_INHERIT) { 5312 child.resetResolvedLayoutDirection(); 5313 } 5314 } 5315 } 5316 5317 @Override 5318 public void onResolvedTextDirectionReset() { 5319 // Take care of resetting the children resolution too 5320 final int count = getChildCount(); 5321 for (int i = 0; i < count; i++) { 5322 final View child = getChildAt(i); 5323 if (child.getTextDirection() == TEXT_DIRECTION_INHERIT) { 5324 child.resetResolvedTextDirection(); 5325 } 5326 } 5327 } 5328 5329 @Override 5330 public void onResolvedTextAlignmentReset() { 5331 // Take care of resetting the children resolution too 5332 final int count = getChildCount(); 5333 for (int i = 0; i < count; i++) { 5334 final View child = getChildAt(i); 5335 if (child.getTextAlignment() == TEXT_ALIGNMENT_INHERIT) { 5336 child.resetResolvedTextAlignment(); 5337 } 5338 } 5339 } 5340 5341 /** 5342 * Return true if the pressed state should be delayed for children or descendants of this 5343 * ViewGroup. Generally, this should be done for containers that can scroll, such as a List. 5344 * This prevents the pressed state from appearing when the user is actually trying to scroll 5345 * the content. 5346 * 5347 * The default implementation returns true for compatibility reasons. Subclasses that do 5348 * not scroll should generally override this method and return false. 5349 */ 5350 public boolean shouldDelayChildPressedState() { 5351 return true; 5352 } 5353 5354 /** @hide */ 5355 protected void onSetLayoutParams(View child, LayoutParams layoutParams) { 5356 } 5357 5358 /** 5359 * LayoutParams are used by views to tell their parents how they want to be 5360 * laid out. See 5361 * {@link android.R.styleable#ViewGroup_Layout ViewGroup Layout Attributes} 5362 * for a list of all child view attributes that this class supports. 5363 * 5364 * <p> 5365 * The base LayoutParams class just describes how big the view wants to be 5366 * for both width and height. For each dimension, it can specify one of: 5367 * <ul> 5368 * <li>FILL_PARENT (renamed MATCH_PARENT in API Level 8 and higher), which 5369 * means that the view wants to be as big as its parent (minus padding) 5370 * <li> WRAP_CONTENT, which means that the view wants to be just big enough 5371 * to enclose its content (plus padding) 5372 * <li> an exact number 5373 * </ul> 5374 * There are subclasses of LayoutParams for different subclasses of 5375 * ViewGroup. For example, AbsoluteLayout has its own subclass of 5376 * LayoutParams which adds an X and Y value.</p> 5377 * 5378 * <div class="special reference"> 5379 * <h3>Developer Guides</h3> 5380 * <p>For more information about creating user interface layouts, read the 5381 * <a href="{@docRoot}guide/topics/ui/declaring-layout.html">XML Layouts</a> developer 5382 * guide.</p></div> 5383 * 5384 * @attr ref android.R.styleable#ViewGroup_Layout_layout_height 5385 * @attr ref android.R.styleable#ViewGroup_Layout_layout_width 5386 */ 5387 public static class LayoutParams { 5388 /** 5389 * Special value for the height or width requested by a View. 5390 * FILL_PARENT means that the view wants to be as big as its parent, 5391 * minus the parent's padding, if any. This value is deprecated 5392 * starting in API Level 8 and replaced by {@link #MATCH_PARENT}. 5393 */ 5394 @SuppressWarnings({"UnusedDeclaration"}) 5395 @Deprecated 5396 public static final int FILL_PARENT = -1; 5397 5398 /** 5399 * Special value for the height or width requested by a View. 5400 * MATCH_PARENT means that the view wants to be as big as its parent, 5401 * minus the parent's padding, if any. Introduced in API Level 8. 5402 */ 5403 public static final int MATCH_PARENT = -1; 5404 5405 /** 5406 * Special value for the height or width requested by a View. 5407 * WRAP_CONTENT means that the view wants to be just large enough to fit 5408 * its own internal content, taking its own padding into account. 5409 */ 5410 public static final int WRAP_CONTENT = -2; 5411 5412 /** 5413 * Information about how wide the view wants to be. Can be one of the 5414 * constants FILL_PARENT (replaced by MATCH_PARENT , 5415 * in API Level 8) or WRAP_CONTENT. or an exact size. 5416 */ 5417 @ViewDebug.ExportedProperty(category = "layout", mapping = { 5418 @ViewDebug.IntToString(from = MATCH_PARENT, to = "MATCH_PARENT"), 5419 @ViewDebug.IntToString(from = WRAP_CONTENT, to = "WRAP_CONTENT") 5420 }) 5421 public int width; 5422 5423 /** 5424 * Information about how tall the view wants to be. Can be one of the 5425 * constants FILL_PARENT (replaced by MATCH_PARENT , 5426 * in API Level 8) or WRAP_CONTENT. or an exact size. 5427 */ 5428 @ViewDebug.ExportedProperty(category = "layout", mapping = { 5429 @ViewDebug.IntToString(from = MATCH_PARENT, to = "MATCH_PARENT"), 5430 @ViewDebug.IntToString(from = WRAP_CONTENT, to = "WRAP_CONTENT") 5431 }) 5432 public int height; 5433 5434 /** 5435 * Used to animate layouts. 5436 */ 5437 public LayoutAnimationController.AnimationParameters layoutAnimationParameters; 5438 5439 /** 5440 * Creates a new set of layout parameters. The values are extracted from 5441 * the supplied attributes set and context. The XML attributes mapped 5442 * to this set of layout parameters are: 5443 * 5444 * <ul> 5445 * <li><code>layout_width</code>: the width, either an exact value, 5446 * {@link #WRAP_CONTENT}, or {@link #FILL_PARENT} (replaced by 5447 * {@link #MATCH_PARENT} in API Level 8)</li> 5448 * <li><code>layout_height</code>: the height, either an exact value, 5449 * {@link #WRAP_CONTENT}, or {@link #FILL_PARENT} (replaced by 5450 * {@link #MATCH_PARENT} in API Level 8)</li> 5451 * </ul> 5452 * 5453 * @param c the application environment 5454 * @param attrs the set of attributes from which to extract the layout 5455 * parameters' values 5456 */ 5457 public LayoutParams(Context c, AttributeSet attrs) { 5458 TypedArray a = c.obtainStyledAttributes(attrs, R.styleable.ViewGroup_Layout); 5459 setBaseAttributes(a, 5460 R.styleable.ViewGroup_Layout_layout_width, 5461 R.styleable.ViewGroup_Layout_layout_height); 5462 a.recycle(); 5463 } 5464 5465 /** 5466 * Creates a new set of layout parameters with the specified width 5467 * and height. 5468 * 5469 * @param width the width, either {@link #WRAP_CONTENT}, 5470 * {@link #FILL_PARENT} (replaced by {@link #MATCH_PARENT} in 5471 * API Level 8), or a fixed size in pixels 5472 * @param height the height, either {@link #WRAP_CONTENT}, 5473 * {@link #FILL_PARENT} (replaced by {@link #MATCH_PARENT} in 5474 * API Level 8), or a fixed size in pixels 5475 */ 5476 public LayoutParams(int width, int height) { 5477 this.width = width; 5478 this.height = height; 5479 } 5480 5481 /** 5482 * Copy constructor. Clones the width and height values of the source. 5483 * 5484 * @param source The layout params to copy from. 5485 */ 5486 public LayoutParams(LayoutParams source) { 5487 this.width = source.width; 5488 this.height = source.height; 5489 } 5490 5491 /** 5492 * Used internally by MarginLayoutParams. 5493 * @hide 5494 */ 5495 LayoutParams() { 5496 } 5497 5498 /** 5499 * Extracts the layout parameters from the supplied attributes. 5500 * 5501 * @param a the style attributes to extract the parameters from 5502 * @param widthAttr the identifier of the width attribute 5503 * @param heightAttr the identifier of the height attribute 5504 */ 5505 protected void setBaseAttributes(TypedArray a, int widthAttr, int heightAttr) { 5506 width = a.getLayoutDimension(widthAttr, "layout_width"); 5507 height = a.getLayoutDimension(heightAttr, "layout_height"); 5508 } 5509 5510 /** 5511 * Resolve layout parameters depending on the layout direction. Subclasses that care about 5512 * layoutDirection changes should override this method. The default implementation does 5513 * nothing. 5514 * 5515 * @param layoutDirection the direction of the layout 5516 * 5517 * {@link View#LAYOUT_DIRECTION_LTR} 5518 * {@link View#LAYOUT_DIRECTION_RTL} 5519 */ 5520 public void onResolveLayoutDirection(int layoutDirection) { 5521 } 5522 5523 /** 5524 * Returns a String representation of this set of layout parameters. 5525 * 5526 * @param output the String to prepend to the internal representation 5527 * @return a String with the following format: output + 5528 * "ViewGroup.LayoutParams={ width=WIDTH, height=HEIGHT }" 5529 * 5530 * @hide 5531 */ 5532 public String debug(String output) { 5533 return output + "ViewGroup.LayoutParams={ width=" 5534 + sizeToString(width) + ", height=" + sizeToString(height) + " }"; 5535 } 5536 5537 /** 5538 * Use {@code canvas} to draw suitable debugging annotations for these LayoutParameters. 5539 * 5540 * @param view the view that contains these layout parameters 5541 * @param canvas the canvas on which to draw 5542 * 5543 * @hide 5544 */ 5545 public void onDebugDraw(View view, Canvas canvas) { 5546 } 5547 5548 /** 5549 * Converts the specified size to a readable String. 5550 * 5551 * @param size the size to convert 5552 * @return a String instance representing the supplied size 5553 * 5554 * @hide 5555 */ 5556 protected static String sizeToString(int size) { 5557 if (size == WRAP_CONTENT) { 5558 return "wrap-content"; 5559 } 5560 if (size == MATCH_PARENT) { 5561 return "match-parent"; 5562 } 5563 return String.valueOf(size); 5564 } 5565 } 5566 5567 /** 5568 * Per-child layout information for layouts that support margins. 5569 * See 5570 * {@link android.R.styleable#ViewGroup_MarginLayout ViewGroup Margin Layout Attributes} 5571 * for a list of all child view attributes that this class supports. 5572 */ 5573 public static class MarginLayoutParams extends ViewGroup.LayoutParams { 5574 /** 5575 * The left margin in pixels of the child. 5576 * Call {@link ViewGroup#setLayoutParams(LayoutParams)} after reassigning a new value 5577 * to this field. 5578 */ 5579 @ViewDebug.ExportedProperty(category = "layout") 5580 public int leftMargin; 5581 5582 /** 5583 * The top margin in pixels of the child. 5584 * Call {@link ViewGroup#setLayoutParams(LayoutParams)} after reassigning a new value 5585 * to this field. 5586 */ 5587 @ViewDebug.ExportedProperty(category = "layout") 5588 public int topMargin; 5589 5590 /** 5591 * The right margin in pixels of the child. 5592 * Call {@link ViewGroup#setLayoutParams(LayoutParams)} after reassigning a new value 5593 * to this field. 5594 */ 5595 @ViewDebug.ExportedProperty(category = "layout") 5596 public int rightMargin; 5597 5598 /** 5599 * The bottom margin in pixels of the child. 5600 * Call {@link ViewGroup#setLayoutParams(LayoutParams)} after reassigning a new value 5601 * to this field. 5602 */ 5603 @ViewDebug.ExportedProperty(category = "layout") 5604 public int bottomMargin; 5605 5606 /** 5607 * The start margin in pixels of the child. 5608 * Call {@link ViewGroup#setLayoutParams(LayoutParams)} after reassigning a new value 5609 * to this field. 5610 */ 5611 @ViewDebug.ExportedProperty(category = "layout") 5612 public int startMargin = DEFAULT_RELATIVE; 5613 5614 /** 5615 * The end margin in pixels of the child. 5616 * Call {@link ViewGroup#setLayoutParams(LayoutParams)} after reassigning a new value 5617 * to this field. 5618 */ 5619 @ViewDebug.ExportedProperty(category = "layout") 5620 public int endMargin = DEFAULT_RELATIVE; 5621 5622 /** 5623 * The default start and end margin. 5624 */ 5625 static private final int DEFAULT_RELATIVE = Integer.MIN_VALUE; 5626 5627 /** 5628 * Creates a new set of layout parameters. The values are extracted from 5629 * the supplied attributes set and context. 5630 * 5631 * @param c the application environment 5632 * @param attrs the set of attributes from which to extract the layout 5633 * parameters' values 5634 */ 5635 public MarginLayoutParams(Context c, AttributeSet attrs) { 5636 super(); 5637 5638 TypedArray a = c.obtainStyledAttributes(attrs, R.styleable.ViewGroup_MarginLayout); 5639 setBaseAttributes(a, 5640 R.styleable.ViewGroup_MarginLayout_layout_width, 5641 R.styleable.ViewGroup_MarginLayout_layout_height); 5642 5643 int margin = a.getDimensionPixelSize( 5644 com.android.internal.R.styleable.ViewGroup_MarginLayout_layout_margin, -1); 5645 if (margin >= 0) { 5646 leftMargin = margin; 5647 topMargin = margin; 5648 rightMargin= margin; 5649 bottomMargin = margin; 5650 } else { 5651 leftMargin = a.getDimensionPixelSize( 5652 R.styleable.ViewGroup_MarginLayout_layout_marginLeft, 0); 5653 topMargin = a.getDimensionPixelSize( 5654 R.styleable.ViewGroup_MarginLayout_layout_marginTop, 0); 5655 rightMargin = a.getDimensionPixelSize( 5656 R.styleable.ViewGroup_MarginLayout_layout_marginRight, 0); 5657 bottomMargin = a.getDimensionPixelSize( 5658 R.styleable.ViewGroup_MarginLayout_layout_marginBottom, 0); 5659 startMargin = a.getDimensionPixelSize( 5660 R.styleable.ViewGroup_MarginLayout_layout_marginStart, DEFAULT_RELATIVE); 5661 endMargin = a.getDimensionPixelSize( 5662 R.styleable.ViewGroup_MarginLayout_layout_marginEnd, DEFAULT_RELATIVE); 5663 } 5664 5665 a.recycle(); 5666 } 5667 5668 /** 5669 * {@inheritDoc} 5670 */ 5671 public MarginLayoutParams(int width, int height) { 5672 super(width, height); 5673 } 5674 5675 /** 5676 * Copy constructor. Clones the width, height and margin values of the source. 5677 * 5678 * @param source The layout params to copy from. 5679 */ 5680 public MarginLayoutParams(MarginLayoutParams source) { 5681 this.width = source.width; 5682 this.height = source.height; 5683 5684 this.leftMargin = source.leftMargin; 5685 this.topMargin = source.topMargin; 5686 this.rightMargin = source.rightMargin; 5687 this.bottomMargin = source.bottomMargin; 5688 this.startMargin = source.startMargin; 5689 this.endMargin = source.endMargin; 5690 } 5691 5692 /** 5693 * {@inheritDoc} 5694 */ 5695 public MarginLayoutParams(LayoutParams source) { 5696 super(source); 5697 } 5698 5699 /** 5700 * Sets the margins, in pixels. A call to {@link android.view.View#requestLayout()} needs 5701 * to be done so that the new margins are taken into account. Left and right margins may be 5702 * overriden by {@link android.view.View#requestLayout()} depending on layout direction. 5703 * 5704 * @param left the left margin size 5705 * @param top the top margin size 5706 * @param right the right margin size 5707 * @param bottom the bottom margin size 5708 * 5709 * @attr ref android.R.styleable#ViewGroup_MarginLayout_layout_marginLeft 5710 * @attr ref android.R.styleable#ViewGroup_MarginLayout_layout_marginTop 5711 * @attr ref android.R.styleable#ViewGroup_MarginLayout_layout_marginRight 5712 * @attr ref android.R.styleable#ViewGroup_MarginLayout_layout_marginBottom 5713 */ 5714 public void setMargins(int left, int top, int right, int bottom) { 5715 leftMargin = left; 5716 topMargin = top; 5717 rightMargin = right; 5718 bottomMargin = bottom; 5719 } 5720 5721 /** 5722 * Sets the relative margins, in pixels. A call to {@link android.view.View#requestLayout()} 5723 * needs to be done so that the new relative margins are taken into account. Left and right 5724 * margins may be overriden by {@link android.view.View#requestLayout()} depending on layout 5725 * direction. 5726 * 5727 * @param start the start margin size 5728 * @param top the top margin size 5729 * @param end the right margin size 5730 * @param bottom the bottom margin size 5731 * 5732 * @attr ref android.R.styleable#ViewGroup_MarginLayout_layout_marginStart 5733 * @attr ref android.R.styleable#ViewGroup_MarginLayout_layout_marginTop 5734 * @attr ref android.R.styleable#ViewGroup_MarginLayout_layout_marginEnd 5735 * @attr ref android.R.styleable#ViewGroup_MarginLayout_layout_marginBottom 5736 * 5737 * @hide 5738 */ 5739 public void setMarginsRelative(int start, int top, int end, int bottom) { 5740 startMargin = start; 5741 topMargin = top; 5742 endMargin = end; 5743 bottomMargin = bottom; 5744 } 5745 5746 /** 5747 * Returns the start margin in pixels. 5748 * 5749 * @attr ref android.R.styleable#ViewGroup_MarginLayout_layout_marginStart 5750 * 5751 * @return the start margin in pixels. 5752 */ 5753 public int getMarginStart() { 5754 return startMargin; 5755 } 5756 5757 /** 5758 * Returns the end margin in pixels. 5759 * 5760 * @attr ref android.R.styleable#ViewGroup_MarginLayout_layout_marginEnd 5761 * 5762 * @return the end margin in pixels. 5763 */ 5764 public int getMarginEnd() { 5765 return endMargin; 5766 } 5767 5768 /** 5769 * Check if margins are relative. 5770 * 5771 * @attr ref android.R.styleable#ViewGroup_MarginLayout_layout_marginStart 5772 * @attr ref android.R.styleable#ViewGroup_MarginLayout_layout_marginEnd 5773 * 5774 * @return true if either marginStart or marginEnd has been set 5775 */ 5776 public boolean isMarginRelative() { 5777 return (startMargin != DEFAULT_RELATIVE) || (endMargin != DEFAULT_RELATIVE); 5778 } 5779 5780 /** 5781 * This will be called by {@link android.view.View#requestLayout()}. Left and Right margins 5782 * may be overridden depending on layout direction. 5783 */ 5784 @Override 5785 public void onResolveLayoutDirection(int layoutDirection) { 5786 switch(layoutDirection) { 5787 case View.LAYOUT_DIRECTION_RTL: 5788 leftMargin = (endMargin > DEFAULT_RELATIVE) ? endMargin : leftMargin; 5789 rightMargin = (startMargin > DEFAULT_RELATIVE) ? startMargin : rightMargin; 5790 break; 5791 case View.LAYOUT_DIRECTION_LTR: 5792 default: 5793 leftMargin = (startMargin > DEFAULT_RELATIVE) ? startMargin : leftMargin; 5794 rightMargin = (endMargin > DEFAULT_RELATIVE) ? endMargin : rightMargin; 5795 break; 5796 } 5797 } 5798 5799 /** 5800 * @hide 5801 */ 5802 @Override 5803 public void onDebugDraw(View view, Canvas canvas) { 5804 drawRect(canvas, 5805 view.getLeft() - leftMargin, 5806 view.getTop() - topMargin, 5807 view.getRight() + rightMargin, 5808 view.getBottom() + bottomMargin, Color.MAGENTA); 5809 } 5810 } 5811 5812 /* Describes a touched view and the ids of the pointers that it has captured. 5813 * 5814 * This code assumes that pointer ids are always in the range 0..31 such that 5815 * it can use a bitfield to track which pointer ids are present. 5816 * As it happens, the lower layers of the input dispatch pipeline also use the 5817 * same trick so the assumption should be safe here... 5818 */ 5819 private static final class TouchTarget { 5820 private static final int MAX_RECYCLED = 32; 5821 private static final Object sRecycleLock = new Object(); 5822 private static TouchTarget sRecycleBin; 5823 private static int sRecycledCount; 5824 5825 public static final int ALL_POINTER_IDS = -1; // all ones 5826 5827 // The touched child view. 5828 public View child; 5829 5830 // The combined bit mask of pointer ids for all pointers captured by the target. 5831 public int pointerIdBits; 5832 5833 // The next target in the target list. 5834 public TouchTarget next; 5835 5836 private TouchTarget() { 5837 } 5838 5839 public static TouchTarget obtain(View child, int pointerIdBits) { 5840 final TouchTarget target; 5841 synchronized (sRecycleLock) { 5842 if (sRecycleBin == null) { 5843 target = new TouchTarget(); 5844 } else { 5845 target = sRecycleBin; 5846 sRecycleBin = target.next; 5847 sRecycledCount--; 5848 target.next = null; 5849 } 5850 } 5851 target.child = child; 5852 target.pointerIdBits = pointerIdBits; 5853 return target; 5854 } 5855 5856 public void recycle() { 5857 synchronized (sRecycleLock) { 5858 if (sRecycledCount < MAX_RECYCLED) { 5859 next = sRecycleBin; 5860 sRecycleBin = this; 5861 sRecycledCount += 1; 5862 } else { 5863 next = null; 5864 } 5865 child = null; 5866 } 5867 } 5868 } 5869 5870 /* Describes a hovered view. */ 5871 private static final class HoverTarget { 5872 private static final int MAX_RECYCLED = 32; 5873 private static final Object sRecycleLock = new Object(); 5874 private static HoverTarget sRecycleBin; 5875 private static int sRecycledCount; 5876 5877 // The hovered child view. 5878 public View child; 5879 5880 // The next target in the target list. 5881 public HoverTarget next; 5882 5883 private HoverTarget() { 5884 } 5885 5886 public static HoverTarget obtain(View child) { 5887 final HoverTarget target; 5888 synchronized (sRecycleLock) { 5889 if (sRecycleBin == null) { 5890 target = new HoverTarget(); 5891 } else { 5892 target = sRecycleBin; 5893 sRecycleBin = target.next; 5894 sRecycledCount--; 5895 target.next = null; 5896 } 5897 } 5898 target.child = child; 5899 return target; 5900 } 5901 5902 public void recycle() { 5903 synchronized (sRecycleLock) { 5904 if (sRecycledCount < MAX_RECYCLED) { 5905 next = sRecycleBin; 5906 sRecycleBin = this; 5907 sRecycledCount += 1; 5908 } else { 5909 next = null; 5910 } 5911 child = null; 5912 } 5913 } 5914 } 5915 5916 /** 5917 * Pooled class that orderes the children of a ViewGroup from start 5918 * to end based on how they are laid out and the layout direction. 5919 */ 5920 static class ChildListForAccessibility { 5921 5922 private static final int MAX_POOL_SIZE = 32; 5923 5924 private static final Object sPoolLock = new Object(); 5925 5926 private static ChildListForAccessibility sPool; 5927 5928 private static int sPoolSize; 5929 5930 private boolean mIsPooled; 5931 5932 private ChildListForAccessibility mNext; 5933 5934 private final ArrayList<View> mChildren = new ArrayList<View>(); 5935 5936 private final ArrayList<ViewLocationHolder> mHolders = new ArrayList<ViewLocationHolder>(); 5937 5938 public static ChildListForAccessibility obtain(ViewGroup parent, boolean sort) { 5939 ChildListForAccessibility list = null; 5940 synchronized (sPoolLock) { 5941 if (sPool != null) { 5942 list = sPool; 5943 sPool = list.mNext; 5944 list.mNext = null; 5945 list.mIsPooled = false; 5946 sPoolSize--; 5947 } else { 5948 list = new ChildListForAccessibility(); 5949 } 5950 list.init(parent, sort); 5951 return list; 5952 } 5953 } 5954 5955 public void recycle() { 5956 if (mIsPooled) { 5957 throw new IllegalStateException("Instance already recycled."); 5958 } 5959 clear(); 5960 synchronized (sPoolLock) { 5961 if (sPoolSize < MAX_POOL_SIZE) { 5962 mNext = sPool; 5963 mIsPooled = true; 5964 sPool = this; 5965 sPoolSize++; 5966 } 5967 } 5968 } 5969 5970 public int getChildCount() { 5971 return mChildren.size(); 5972 } 5973 5974 public View getChildAt(int index) { 5975 return mChildren.get(index); 5976 } 5977 5978 public int getChildIndex(View child) { 5979 return mChildren.indexOf(child); 5980 } 5981 5982 private void init(ViewGroup parent, boolean sort) { 5983 ArrayList<View> children = mChildren; 5984 final int childCount = parent.getChildCount(); 5985 for (int i = 0; i < childCount; i++) { 5986 View child = parent.getChildAt(i); 5987 children.add(child); 5988 } 5989 if (sort) { 5990 ArrayList<ViewLocationHolder> holders = mHolders; 5991 for (int i = 0; i < childCount; i++) { 5992 View child = children.get(i); 5993 ViewLocationHolder holder = ViewLocationHolder.obtain(parent, child); 5994 holders.add(holder); 5995 } 5996 Collections.sort(holders); 5997 for (int i = 0; i < childCount; i++) { 5998 ViewLocationHolder holder = holders.get(i); 5999 children.set(i, holder.mView); 6000 holder.recycle(); 6001 } 6002 holders.clear(); 6003 } 6004 } 6005 6006 private void clear() { 6007 mChildren.clear(); 6008 } 6009 } 6010 6011 /** 6012 * Pooled class that holds a View and its location with respect to 6013 * a specified root. This enables sorting of views based on their 6014 * coordinates without recomputing the position relative to the root 6015 * on every comparison. 6016 */ 6017 static class ViewLocationHolder implements Comparable<ViewLocationHolder> { 6018 6019 private static final int MAX_POOL_SIZE = 32; 6020 6021 private static final Object sPoolLock = new Object(); 6022 6023 private static ViewLocationHolder sPool; 6024 6025 private static int sPoolSize; 6026 6027 private boolean mIsPooled; 6028 6029 private ViewLocationHolder mNext; 6030 6031 private final Rect mLocation = new Rect(); 6032 6033 public View mView; 6034 6035 private int mLayoutDirection; 6036 6037 public static ViewLocationHolder obtain(ViewGroup root, View view) { 6038 ViewLocationHolder holder = null; 6039 synchronized (sPoolLock) { 6040 if (sPool != null) { 6041 holder = sPool; 6042 sPool = holder.mNext; 6043 holder.mNext = null; 6044 holder.mIsPooled = false; 6045 sPoolSize--; 6046 } else { 6047 holder = new ViewLocationHolder(); 6048 } 6049 holder.init(root, view); 6050 return holder; 6051 } 6052 } 6053 6054 public void recycle() { 6055 if (mIsPooled) { 6056 throw new IllegalStateException("Instance already recycled."); 6057 } 6058 clear(); 6059 synchronized (sPoolLock) { 6060 if (sPoolSize < MAX_POOL_SIZE) { 6061 mNext = sPool; 6062 mIsPooled = true; 6063 sPool = this; 6064 sPoolSize++; 6065 } 6066 } 6067 } 6068 6069 @Override 6070 public int compareTo(ViewLocationHolder another) { 6071 // This instance is greater than an invalid argument. 6072 if (another == null) { 6073 return 1; 6074 } 6075 if (getClass() != another.getClass()) { 6076 return 1; 6077 } 6078 // First is above second. 6079 if (mLocation.bottom - another.mLocation.top <= 0) { 6080 return -1; 6081 } 6082 // First is below second. 6083 if (mLocation.top - another.mLocation.bottom >= 0) { 6084 return 1; 6085 } 6086 // LTR 6087 if (mLayoutDirection == LAYOUT_DIRECTION_LTR) { 6088 final int leftDifference = mLocation.left - another.mLocation.left; 6089 // First more to the left than second. 6090 if (leftDifference != 0) { 6091 return leftDifference; 6092 } 6093 } else { // RTL 6094 final int rightDifference = mLocation.right - another.mLocation.right; 6095 // First more to the right than second. 6096 if (rightDifference != 0) { 6097 return -rightDifference; 6098 } 6099 } 6100 // Break tie by top. 6101 final int topDiference = mLocation.top - another.mLocation.top; 6102 if (topDiference != 0) { 6103 return topDiference; 6104 } 6105 // Break tie by height. 6106 final int heightDiference = mLocation.height() - another.mLocation.height(); 6107 if (heightDiference != 0) { 6108 return -heightDiference; 6109 } 6110 // Break tie by width. 6111 final int widthDiference = mLocation.width() - another.mLocation.width(); 6112 if (widthDiference != 0) { 6113 return -widthDiference; 6114 } 6115 // Just break the tie somehow. The accessibliity ids are unique 6116 // and stable, hence this is deterministic tie breaking. 6117 return mView.getAccessibilityViewId() - another.mView.getAccessibilityViewId(); 6118 } 6119 6120 private void init(ViewGroup root, View view) { 6121 Rect viewLocation = mLocation; 6122 view.getDrawingRect(viewLocation); 6123 root.offsetDescendantRectToMyCoords(view, viewLocation); 6124 mView = view; 6125 mLayoutDirection = root.getResolvedLayoutDirection(); 6126 } 6127 6128 private void clear() { 6129 mView = null; 6130 mLocation.set(0, 0, 0, 0); 6131 } 6132 } 6133 6134 private static Paint getDebugPaint() { 6135 if (sDebugPaint == null) { 6136 sDebugPaint = new Paint(); 6137 sDebugPaint.setAntiAlias(false); 6138 } 6139 return sDebugPaint; 6140 } 6141 6142 private static float[] getDebugLines(int x1, int y1, int x2, int y2) { 6143 if (sDebugLines== null) { 6144 sDebugLines = new float[16]; 6145 } 6146 6147 x2--; 6148 y2--; 6149 6150 sDebugLines[0] = x1; 6151 sDebugLines[1] = y1; 6152 sDebugLines[2] = x2; 6153 sDebugLines[3] = y1; 6154 6155 sDebugLines[4] = x2; 6156 sDebugLines[5] = y1; 6157 sDebugLines[6] = x2; 6158 sDebugLines[7] = y2 + 1; 6159 6160 sDebugLines[8] = x2 + 1; 6161 sDebugLines[9] = y2; 6162 sDebugLines[10] = x1; 6163 sDebugLines[11] = y2; 6164 6165 sDebugLines[12] = x1; 6166 sDebugLines[13] = y2; 6167 sDebugLines[14] = x1; 6168 sDebugLines[15] = y1; 6169 6170 return sDebugLines; 6171 } 6172} 6173