ViewGroup.java revision 64a48c1d3daca9e0565f2aa4d56f6e94ea073d9b
1/* 2 * Copyright (C) 2006 The Android Open Source Project 3 * 4 * Licensed under the Apache License, Version 2.0 (the "License"); 5 * you may not use this file except in compliance with the License. 6 * You may obtain a copy of the License at 7 * 8 * http://www.apache.org/licenses/LICENSE-2.0 9 * 10 * Unless required by applicable law or agreed to in writing, software 11 * distributed under the License is distributed on an "AS IS" BASIS, 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 13 * See the License for the specific language governing permissions and 14 * limitations under the License. 15 */ 16 17package android.view; 18 19import android.animation.LayoutTransition; 20import android.content.Context; 21import android.content.res.Configuration; 22import android.content.res.TypedArray; 23import android.graphics.Bitmap; 24import android.graphics.Canvas; 25import android.graphics.Matrix; 26import android.graphics.Paint; 27import android.graphics.PointF; 28import android.graphics.Rect; 29import android.graphics.RectF; 30import android.graphics.Region; 31import android.os.Build; 32import android.os.Parcelable; 33import android.os.SystemClock; 34import android.util.AttributeSet; 35import android.util.Log; 36import android.util.SparseArray; 37import android.view.accessibility.AccessibilityEvent; 38import android.view.accessibility.AccessibilityNodeInfo; 39import android.view.animation.Animation; 40import android.view.animation.AnimationUtils; 41import android.view.animation.LayoutAnimationController; 42import android.view.animation.Transformation; 43 44import com.android.internal.R; 45import com.android.internal.util.Predicate; 46 47import java.util.ArrayList; 48import java.util.HashSet; 49 50/** 51 * <p> 52 * A <code>ViewGroup</code> is a special view that can contain other views 53 * (called children.) The view group is the base class for layouts and views 54 * containers. This class also defines the 55 * {@link android.view.ViewGroup.LayoutParams} class which serves as the base 56 * class for layouts parameters. 57 * </p> 58 * 59 * <p> 60 * Also see {@link LayoutParams} for layout attributes. 61 * </p> 62 * 63 * <div class="special reference"> 64 * <h3>Developer Guides</h3> 65 * <p>For more information about creating user interface layouts, read the 66 * <a href="{@docRoot}guide/topics/ui/declaring-layout.html">XML Layouts</a> developer 67 * guide.</p></div> 68 * 69 * @attr ref android.R.styleable#ViewGroup_clipChildren 70 * @attr ref android.R.styleable#ViewGroup_clipToPadding 71 * @attr ref android.R.styleable#ViewGroup_layoutAnimation 72 * @attr ref android.R.styleable#ViewGroup_animationCache 73 * @attr ref android.R.styleable#ViewGroup_persistentDrawingCache 74 * @attr ref android.R.styleable#ViewGroup_alwaysDrawnWithCache 75 * @attr ref android.R.styleable#ViewGroup_addStatesFromChildren 76 * @attr ref android.R.styleable#ViewGroup_descendantFocusability 77 * @attr ref android.R.styleable#ViewGroup_animateLayoutChanges 78 */ 79public abstract class ViewGroup extends View implements ViewParent, ViewManager { 80 81 private static final boolean DBG = false; 82 83 /** 84 * Views which have been hidden or removed which need to be animated on 85 * their way out. 86 * This field should be made private, so it is hidden from the SDK. 87 * {@hide} 88 */ 89 protected ArrayList<View> mDisappearingChildren; 90 91 /** 92 * Listener used to propagate events indicating when children are added 93 * and/or removed from a view group. 94 * This field should be made private, so it is hidden from the SDK. 95 * {@hide} 96 */ 97 protected OnHierarchyChangeListener mOnHierarchyChangeListener; 98 99 // The view contained within this ViewGroup that has or contains focus. 100 private View mFocused; 101 102 /** 103 * A Transformation used when drawing children, to 104 * apply on the child being drawn. 105 */ 106 final Transformation mChildTransformation = new Transformation(); 107 108 /** 109 * Used to track the current invalidation region. 110 */ 111 RectF mInvalidateRegion; 112 113 /** 114 * A Transformation used to calculate a correct 115 * invalidation area when the application is autoscaled. 116 */ 117 Transformation mInvalidationTransformation; 118 119 // View currently under an ongoing drag 120 private View mCurrentDragView; 121 122 // Metadata about the ongoing drag 123 private DragEvent mCurrentDrag; 124 private HashSet<View> mDragNotifiedChildren; 125 126 // Does this group have a child that can accept the current drag payload? 127 private boolean mChildAcceptsDrag; 128 129 // Used during drag dispatch 130 private final PointF mLocalPoint = new PointF(); 131 132 // Layout animation 133 private LayoutAnimationController mLayoutAnimationController; 134 private Animation.AnimationListener mAnimationListener; 135 136 // First touch target in the linked list of touch targets. 137 private TouchTarget mFirstTouchTarget; 138 139 // For debugging only. You can see these in hierarchyviewer. 140 @SuppressWarnings({"FieldCanBeLocal", "UnusedDeclaration"}) 141 @ViewDebug.ExportedProperty(category = "events") 142 private long mLastTouchDownTime; 143 @ViewDebug.ExportedProperty(category = "events") 144 private int mLastTouchDownIndex = -1; 145 @SuppressWarnings({"FieldCanBeLocal", "UnusedDeclaration"}) 146 @ViewDebug.ExportedProperty(category = "events") 147 private float mLastTouchDownX; 148 @SuppressWarnings({"FieldCanBeLocal", "UnusedDeclaration"}) 149 @ViewDebug.ExportedProperty(category = "events") 150 private float mLastTouchDownY; 151 152 // First hover target in the linked list of hover targets. 153 // The hover targets are children which have received ACTION_HOVER_ENTER. 154 // They might not have actually handled the hover event, but we will 155 // continue sending hover events to them as long as the pointer remains over 156 // their bounds and the view group does not intercept hover. 157 private HoverTarget mFirstHoverTarget; 158 159 // True if the view group itself received a hover event. 160 // It might not have actually handled the hover event. 161 private boolean mHoveredSelf; 162 163 /** 164 * Internal flags. 165 * 166 * This field should be made private, so it is hidden from the SDK. 167 * {@hide} 168 */ 169 protected int mGroupFlags; 170 171 // When set, ViewGroup invalidates only the child's rectangle 172 // Set by default 173 static final int FLAG_CLIP_CHILDREN = 0x1; 174 175 // When set, ViewGroup excludes the padding area from the invalidate rectangle 176 // Set by default 177 private static final int FLAG_CLIP_TO_PADDING = 0x2; 178 179 // When set, dispatchDraw() will invoke invalidate(); this is set by drawChild() when 180 // a child needs to be invalidated and FLAG_OPTIMIZE_INVALIDATE is set 181 static final int FLAG_INVALIDATE_REQUIRED = 0x4; 182 183 // When set, dispatchDraw() will run the layout animation and unset the flag 184 private static final int FLAG_RUN_ANIMATION = 0x8; 185 186 // When set, there is either no layout animation on the ViewGroup or the layout 187 // animation is over 188 // Set by default 189 static final int FLAG_ANIMATION_DONE = 0x10; 190 191 // If set, this ViewGroup has padding; if unset there is no padding and we don't need 192 // to clip it, even if FLAG_CLIP_TO_PADDING is set 193 private static final int FLAG_PADDING_NOT_NULL = 0x20; 194 195 // When set, this ViewGroup caches its children in a Bitmap before starting a layout animation 196 // Set by default 197 private static final int FLAG_ANIMATION_CACHE = 0x40; 198 199 // When set, this ViewGroup converts calls to invalidate(Rect) to invalidate() during a 200 // layout animation; this avoid clobbering the hierarchy 201 // Automatically set when the layout animation starts, depending on the animation's 202 // characteristics 203 static final int FLAG_OPTIMIZE_INVALIDATE = 0x80; 204 205 // When set, the next call to drawChild() will clear mChildTransformation's matrix 206 static final int FLAG_CLEAR_TRANSFORMATION = 0x100; 207 208 // When set, this ViewGroup invokes mAnimationListener.onAnimationEnd() and removes 209 // the children's Bitmap caches if necessary 210 // This flag is set when the layout animation is over (after FLAG_ANIMATION_DONE is set) 211 private static final int FLAG_NOTIFY_ANIMATION_LISTENER = 0x200; 212 213 /** 214 * When set, the drawing method will call {@link #getChildDrawingOrder(int, int)} 215 * to get the index of the child to draw for that iteration. 216 * 217 * @hide 218 */ 219 protected static final int FLAG_USE_CHILD_DRAWING_ORDER = 0x400; 220 221 /** 222 * When set, this ViewGroup supports static transformations on children; this causes 223 * {@link #getChildStaticTransformation(View, android.view.animation.Transformation)} to be 224 * invoked when a child is drawn. 225 * 226 * Any subclass overriding 227 * {@link #getChildStaticTransformation(View, android.view.animation.Transformation)} should 228 * set this flags in {@link #mGroupFlags}. 229 * 230 * {@hide} 231 */ 232 protected static final int FLAG_SUPPORT_STATIC_TRANSFORMATIONS = 0x800; 233 234 // When the previous drawChild() invocation used an alpha value that was lower than 235 // 1.0 and set it in mCachePaint 236 static final int FLAG_ALPHA_LOWER_THAN_ONE = 0x1000; 237 238 /** 239 * When set, this ViewGroup's drawable states also include those 240 * of its children. 241 */ 242 private static final int FLAG_ADD_STATES_FROM_CHILDREN = 0x2000; 243 244 /** 245 * When set, this ViewGroup tries to always draw its children using their drawing cache. 246 */ 247 static final int FLAG_ALWAYS_DRAWN_WITH_CACHE = 0x4000; 248 249 /** 250 * When set, and if FLAG_ALWAYS_DRAWN_WITH_CACHE is not set, this ViewGroup will try to 251 * draw its children with their drawing cache. 252 */ 253 static final int FLAG_CHILDREN_DRAWN_WITH_CACHE = 0x8000; 254 255 /** 256 * When set, this group will go through its list of children to notify them of 257 * any drawable state change. 258 */ 259 private static final int FLAG_NOTIFY_CHILDREN_ON_DRAWABLE_STATE_CHANGE = 0x10000; 260 261 private static final int FLAG_MASK_FOCUSABILITY = 0x60000; 262 263 /** 264 * This view will get focus before any of its descendants. 265 */ 266 public static final int FOCUS_BEFORE_DESCENDANTS = 0x20000; 267 268 /** 269 * This view will get focus only if none of its descendants want it. 270 */ 271 public static final int FOCUS_AFTER_DESCENDANTS = 0x40000; 272 273 /** 274 * This view will block any of its descendants from getting focus, even 275 * if they are focusable. 276 */ 277 public static final int FOCUS_BLOCK_DESCENDANTS = 0x60000; 278 279 /** 280 * Used to map between enum in attrubutes and flag values. 281 */ 282 private static final int[] DESCENDANT_FOCUSABILITY_FLAGS = 283 {FOCUS_BEFORE_DESCENDANTS, FOCUS_AFTER_DESCENDANTS, 284 FOCUS_BLOCK_DESCENDANTS}; 285 286 /** 287 * When set, this ViewGroup should not intercept touch events. 288 * {@hide} 289 */ 290 protected static final int FLAG_DISALLOW_INTERCEPT = 0x80000; 291 292 /** 293 * When set, this ViewGroup will split MotionEvents to multiple child Views when appropriate. 294 */ 295 private static final int FLAG_SPLIT_MOTION_EVENTS = 0x200000; 296 297 /** 298 * When set, this ViewGroup will not dispatch onAttachedToWindow calls 299 * to children when adding new views. This is used to prevent multiple 300 * onAttached calls when a ViewGroup adds children in its own onAttached method. 301 */ 302 private static final int FLAG_PREVENT_DISPATCH_ATTACHED_TO_WINDOW = 0x400000; 303 304 /** 305 * Indicates which types of drawing caches are to be kept in memory. 306 * This field should be made private, so it is hidden from the SDK. 307 * {@hide} 308 */ 309 protected int mPersistentDrawingCache; 310 311 /** 312 * Used to indicate that no drawing cache should be kept in memory. 313 */ 314 public static final int PERSISTENT_NO_CACHE = 0x0; 315 316 /** 317 * Used to indicate that the animation drawing cache should be kept in memory. 318 */ 319 public static final int PERSISTENT_ANIMATION_CACHE = 0x1; 320 321 /** 322 * Used to indicate that the scrolling drawing cache should be kept in memory. 323 */ 324 public static final int PERSISTENT_SCROLLING_CACHE = 0x2; 325 326 /** 327 * Used to indicate that all drawing caches should be kept in memory. 328 */ 329 public static final int PERSISTENT_ALL_CACHES = 0x3; 330 331 /** 332 * We clip to padding when FLAG_CLIP_TO_PADDING and FLAG_PADDING_NOT_NULL 333 * are set at the same time. 334 */ 335 protected static final int CLIP_TO_PADDING_MASK = FLAG_CLIP_TO_PADDING | FLAG_PADDING_NOT_NULL; 336 337 // Index of the child's left position in the mLocation array 338 private static final int CHILD_LEFT_INDEX = 0; 339 // Index of the child's top position in the mLocation array 340 private static final int CHILD_TOP_INDEX = 1; 341 342 // Child views of this ViewGroup 343 private View[] mChildren; 344 // Number of valid children in the mChildren array, the rest should be null or not 345 // considered as children 346 347 private boolean mLayoutSuppressed = false; 348 349 private int mChildrenCount; 350 351 private static final int ARRAY_INITIAL_CAPACITY = 12; 352 private static final int ARRAY_CAPACITY_INCREMENT = 12; 353 354 // Used to draw cached views 355 Paint mCachePaint; 356 357 // Used to animate add/remove changes in layout 358 private LayoutTransition mTransition; 359 360 // The set of views that are currently being transitioned. This list is used to track views 361 // being removed that should not actually be removed from the parent yet because they are 362 // being animated. 363 private ArrayList<View> mTransitioningViews; 364 365 // List of children changing visibility. This is used to potentially keep rendering 366 // views during a transition when they otherwise would have become gone/invisible 367 private ArrayList<View> mVisibilityChangingChildren; 368 369 // Indicates whether this container will use its children layers to draw 370 @ViewDebug.ExportedProperty(category = "drawing") 371 boolean mDrawLayers = true; 372 373 public ViewGroup(Context context) { 374 super(context); 375 initViewGroup(); 376 } 377 378 public ViewGroup(Context context, AttributeSet attrs) { 379 super(context, attrs); 380 initViewGroup(); 381 initFromAttributes(context, attrs); 382 } 383 384 public ViewGroup(Context context, AttributeSet attrs, int defStyle) { 385 super(context, attrs, defStyle); 386 initViewGroup(); 387 initFromAttributes(context, attrs); 388 } 389 390 private void initViewGroup() { 391 // ViewGroup doesn't draw by default 392 setFlags(WILL_NOT_DRAW, DRAW_MASK); 393 mGroupFlags |= FLAG_CLIP_CHILDREN; 394 mGroupFlags |= FLAG_CLIP_TO_PADDING; 395 mGroupFlags |= FLAG_ANIMATION_DONE; 396 mGroupFlags |= FLAG_ANIMATION_CACHE; 397 mGroupFlags |= FLAG_ALWAYS_DRAWN_WITH_CACHE; 398 399 if (mContext.getApplicationInfo().targetSdkVersion >= Build.VERSION_CODES.HONEYCOMB) { 400 mGroupFlags |= FLAG_SPLIT_MOTION_EVENTS; 401 } 402 403 setDescendantFocusability(FOCUS_BEFORE_DESCENDANTS); 404 405 mChildren = new View[ARRAY_INITIAL_CAPACITY]; 406 mChildrenCount = 0; 407 408 mPersistentDrawingCache = PERSISTENT_SCROLLING_CACHE; 409 } 410 411 private void initFromAttributes(Context context, AttributeSet attrs) { 412 TypedArray a = context.obtainStyledAttributes(attrs, 413 R.styleable.ViewGroup); 414 415 final int N = a.getIndexCount(); 416 for (int i = 0; i < N; i++) { 417 int attr = a.getIndex(i); 418 switch (attr) { 419 case R.styleable.ViewGroup_clipChildren: 420 setClipChildren(a.getBoolean(attr, true)); 421 break; 422 case R.styleable.ViewGroup_clipToPadding: 423 setClipToPadding(a.getBoolean(attr, true)); 424 break; 425 case R.styleable.ViewGroup_animationCache: 426 setAnimationCacheEnabled(a.getBoolean(attr, true)); 427 break; 428 case R.styleable.ViewGroup_persistentDrawingCache: 429 setPersistentDrawingCache(a.getInt(attr, PERSISTENT_SCROLLING_CACHE)); 430 break; 431 case R.styleable.ViewGroup_addStatesFromChildren: 432 setAddStatesFromChildren(a.getBoolean(attr, false)); 433 break; 434 case R.styleable.ViewGroup_alwaysDrawnWithCache: 435 setAlwaysDrawnWithCacheEnabled(a.getBoolean(attr, true)); 436 break; 437 case R.styleable.ViewGroup_layoutAnimation: 438 int id = a.getResourceId(attr, -1); 439 if (id > 0) { 440 setLayoutAnimation(AnimationUtils.loadLayoutAnimation(mContext, id)); 441 } 442 break; 443 case R.styleable.ViewGroup_descendantFocusability: 444 setDescendantFocusability(DESCENDANT_FOCUSABILITY_FLAGS[a.getInt(attr, 0)]); 445 break; 446 case R.styleable.ViewGroup_splitMotionEvents: 447 setMotionEventSplittingEnabled(a.getBoolean(attr, false)); 448 break; 449 case R.styleable.ViewGroup_animateLayoutChanges: 450 boolean animateLayoutChanges = a.getBoolean(attr, false); 451 if (animateLayoutChanges) { 452 setLayoutTransition(new LayoutTransition()); 453 } 454 break; 455 } 456 } 457 458 a.recycle(); 459 } 460 461 /** 462 * Gets the descendant focusability of this view group. The descendant 463 * focusability defines the relationship between this view group and its 464 * descendants when looking for a view to take focus in 465 * {@link #requestFocus(int, android.graphics.Rect)}. 466 * 467 * @return one of {@link #FOCUS_BEFORE_DESCENDANTS}, {@link #FOCUS_AFTER_DESCENDANTS}, 468 * {@link #FOCUS_BLOCK_DESCENDANTS}. 469 */ 470 @ViewDebug.ExportedProperty(category = "focus", mapping = { 471 @ViewDebug.IntToString(from = FOCUS_BEFORE_DESCENDANTS, to = "FOCUS_BEFORE_DESCENDANTS"), 472 @ViewDebug.IntToString(from = FOCUS_AFTER_DESCENDANTS, to = "FOCUS_AFTER_DESCENDANTS"), 473 @ViewDebug.IntToString(from = FOCUS_BLOCK_DESCENDANTS, to = "FOCUS_BLOCK_DESCENDANTS") 474 }) 475 public int getDescendantFocusability() { 476 return mGroupFlags & FLAG_MASK_FOCUSABILITY; 477 } 478 479 /** 480 * Set the descendant focusability of this view group. This defines the relationship 481 * between this view group and its descendants when looking for a view to 482 * take focus in {@link #requestFocus(int, android.graphics.Rect)}. 483 * 484 * @param focusability one of {@link #FOCUS_BEFORE_DESCENDANTS}, {@link #FOCUS_AFTER_DESCENDANTS}, 485 * {@link #FOCUS_BLOCK_DESCENDANTS}. 486 */ 487 public void setDescendantFocusability(int focusability) { 488 switch (focusability) { 489 case FOCUS_BEFORE_DESCENDANTS: 490 case FOCUS_AFTER_DESCENDANTS: 491 case FOCUS_BLOCK_DESCENDANTS: 492 break; 493 default: 494 throw new IllegalArgumentException("must be one of FOCUS_BEFORE_DESCENDANTS, " 495 + "FOCUS_AFTER_DESCENDANTS, FOCUS_BLOCK_DESCENDANTS"); 496 } 497 mGroupFlags &= ~FLAG_MASK_FOCUSABILITY; 498 mGroupFlags |= (focusability & FLAG_MASK_FOCUSABILITY); 499 } 500 501 /** 502 * {@inheritDoc} 503 */ 504 @Override 505 void handleFocusGainInternal(int direction, Rect previouslyFocusedRect) { 506 if (mFocused != null) { 507 mFocused.unFocus(); 508 mFocused = null; 509 } 510 super.handleFocusGainInternal(direction, previouslyFocusedRect); 511 } 512 513 /** 514 * {@inheritDoc} 515 */ 516 public void requestChildFocus(View child, View focused) { 517 if (DBG) { 518 System.out.println(this + " requestChildFocus()"); 519 } 520 if (getDescendantFocusability() == FOCUS_BLOCK_DESCENDANTS) { 521 return; 522 } 523 524 // Unfocus us, if necessary 525 super.unFocus(); 526 527 // We had a previous notion of who had focus. Clear it. 528 if (mFocused != child) { 529 if (mFocused != null) { 530 mFocused.unFocus(); 531 } 532 533 mFocused = child; 534 } 535 if (mParent != null) { 536 mParent.requestChildFocus(this, focused); 537 } 538 } 539 540 /** 541 * {@inheritDoc} 542 */ 543 public void focusableViewAvailable(View v) { 544 if (mParent != null 545 // shortcut: don't report a new focusable view if we block our descendants from 546 // getting focus 547 && (getDescendantFocusability() != FOCUS_BLOCK_DESCENDANTS) 548 // shortcut: don't report a new focusable view if we already are focused 549 // (and we don't prefer our descendants) 550 // 551 // note: knowing that mFocused is non-null is not a good enough reason 552 // to break the traversal since in that case we'd actually have to find 553 // the focused view and make sure it wasn't FOCUS_AFTER_DESCENDANTS and 554 // an ancestor of v; this will get checked for at ViewAncestor 555 && !(isFocused() && getDescendantFocusability() != FOCUS_AFTER_DESCENDANTS)) { 556 mParent.focusableViewAvailable(v); 557 } 558 } 559 560 /** 561 * {@inheritDoc} 562 */ 563 public boolean showContextMenuForChild(View originalView) { 564 return mParent != null && mParent.showContextMenuForChild(originalView); 565 } 566 567 /** 568 * {@inheritDoc} 569 */ 570 public ActionMode startActionModeForChild(View originalView, ActionMode.Callback callback) { 571 return mParent != null ? mParent.startActionModeForChild(originalView, callback) : null; 572 } 573 574 /** 575 * Find the nearest view in the specified direction that wants to take 576 * focus. 577 * 578 * @param focused The view that currently has focus 579 * @param direction One of FOCUS_UP, FOCUS_DOWN, FOCUS_LEFT, and 580 * FOCUS_RIGHT, or 0 for not applicable. 581 */ 582 public View focusSearch(View focused, int direction) { 583 if (isRootNamespace()) { 584 // root namespace means we should consider ourselves the top of the 585 // tree for focus searching; otherwise we could be focus searching 586 // into other tabs. see LocalActivityManager and TabHost for more info 587 return FocusFinder.getInstance().findNextFocus(this, focused, direction); 588 } else if (mParent != null) { 589 return mParent.focusSearch(focused, direction); 590 } 591 return null; 592 } 593 594 /** 595 * {@inheritDoc} 596 */ 597 public boolean requestChildRectangleOnScreen(View child, Rect rectangle, boolean immediate) { 598 return false; 599 } 600 601 /** 602 * {@inheritDoc} 603 */ 604 public boolean requestSendAccessibilityEvent(View child, AccessibilityEvent event) { 605 ViewParent parent = getParent(); 606 if (parent == null) { 607 return false; 608 } 609 final boolean propagate = onRequestSendAccessibilityEvent(child, event); 610 //noinspection SimplifiableIfStatement 611 if (!propagate) { 612 return false; 613 } 614 return parent.requestSendAccessibilityEvent(this, event); 615 } 616 617 /** 618 * Called when a child has requested sending an {@link AccessibilityEvent} and 619 * gives an opportunity to its parent to augment the event. 620 * <p> 621 * If an {@link android.view.View.AccessibilityDelegate} has been specified via calling 622 * {@link android.view.View#setAccessibilityDelegate(android.view.View.AccessibilityDelegate)} its 623 * {@link android.view.View.AccessibilityDelegate#onRequestSendAccessibilityEvent(ViewGroup, View, AccessibilityEvent)} 624 * is responsible for handling this call. 625 * </p> 626 * 627 * @param child The child which requests sending the event. 628 * @param event The event to be sent. 629 * @return True if the event should be sent. 630 * 631 * @see #requestSendAccessibilityEvent(View, AccessibilityEvent) 632 */ 633 public boolean onRequestSendAccessibilityEvent(View child, AccessibilityEvent event) { 634 if (mAccessibilityDelegate != null) { 635 return mAccessibilityDelegate.onRequestSendAccessibilityEvent(this, child, event); 636 } else { 637 return onRequestSendAccessibilityEventInternal(child, event); 638 } 639 } 640 641 /** 642 * @see #onRequestSendAccessibilityEvent(View, AccessibilityEvent) 643 * 644 * Note: Called from the default {@link View.AccessibilityDelegate}. 645 */ 646 boolean onRequestSendAccessibilityEventInternal(View child, AccessibilityEvent event) { 647 return true; 648 } 649 650 /** 651 * {@inheritDoc} 652 */ 653 @Override 654 public boolean dispatchUnhandledMove(View focused, int direction) { 655 return mFocused != null && 656 mFocused.dispatchUnhandledMove(focused, direction); 657 } 658 659 /** 660 * {@inheritDoc} 661 */ 662 public void clearChildFocus(View child) { 663 if (DBG) { 664 System.out.println(this + " clearChildFocus()"); 665 } 666 667 mFocused = null; 668 if (mParent != null) { 669 mParent.clearChildFocus(this); 670 } 671 } 672 673 /** 674 * {@inheritDoc} 675 */ 676 @Override 677 public void clearFocus() { 678 if (DBG) { 679 System.out.println(this + " clearFocus()"); 680 } 681 if (mFocused == null) { 682 super.clearFocus(); 683 } else { 684 mFocused.clearFocus(); 685 mFocused = null; 686 } 687 } 688 689 /** 690 * {@inheritDoc} 691 */ 692 @Override 693 void unFocus() { 694 if (DBG) { 695 System.out.println(this + " unFocus()"); 696 } 697 if (mFocused == null) { 698 super.unFocus(); 699 } else { 700 mFocused.unFocus(); 701 mFocused = null; 702 } 703 } 704 705 /** 706 * Returns the focused child of this view, if any. The child may have focus 707 * or contain focus. 708 * 709 * @return the focused child or null. 710 */ 711 public View getFocusedChild() { 712 return mFocused; 713 } 714 715 /** 716 * Returns true if this view has or contains focus 717 * 718 * @return true if this view has or contains focus 719 */ 720 @Override 721 public boolean hasFocus() { 722 return (mPrivateFlags & FOCUSED) != 0 || mFocused != null; 723 } 724 725 /* 726 * (non-Javadoc) 727 * 728 * @see android.view.View#findFocus() 729 */ 730 @Override 731 public View findFocus() { 732 if (DBG) { 733 System.out.println("Find focus in " + this + ": flags=" 734 + isFocused() + ", child=" + mFocused); 735 } 736 737 if (isFocused()) { 738 return this; 739 } 740 741 if (mFocused != null) { 742 return mFocused.findFocus(); 743 } 744 return null; 745 } 746 747 /** 748 * {@inheritDoc} 749 */ 750 @Override 751 public boolean hasFocusable() { 752 if ((mViewFlags & VISIBILITY_MASK) != VISIBLE) { 753 return false; 754 } 755 756 if (isFocusable()) { 757 return true; 758 } 759 760 final int descendantFocusability = getDescendantFocusability(); 761 if (descendantFocusability != FOCUS_BLOCK_DESCENDANTS) { 762 final int count = mChildrenCount; 763 final View[] children = mChildren; 764 765 for (int i = 0; i < count; i++) { 766 final View child = children[i]; 767 if (child.hasFocusable()) { 768 return true; 769 } 770 } 771 } 772 773 return false; 774 } 775 776 /** 777 * {@inheritDoc} 778 */ 779 @Override 780 public void addFocusables(ArrayList<View> views, int direction) { 781 addFocusables(views, direction, FOCUSABLES_TOUCH_MODE); 782 } 783 784 /** 785 * {@inheritDoc} 786 */ 787 @Override 788 public void addFocusables(ArrayList<View> views, int direction, int focusableMode) { 789 final int focusableCount = views.size(); 790 791 final int descendantFocusability = getDescendantFocusability(); 792 793 if (descendantFocusability != FOCUS_BLOCK_DESCENDANTS) { 794 final int count = mChildrenCount; 795 final View[] children = mChildren; 796 797 for (int i = 0; i < count; i++) { 798 final View child = children[i]; 799 if ((child.mViewFlags & VISIBILITY_MASK) == VISIBLE) { 800 child.addFocusables(views, direction, focusableMode); 801 } 802 } 803 } 804 805 // we add ourselves (if focusable) in all cases except for when we are 806 // FOCUS_AFTER_DESCENDANTS and there are some descendants focusable. this is 807 // to avoid the focus search finding layouts when a more precise search 808 // among the focusable children would be more interesting. 809 if ( 810 descendantFocusability != FOCUS_AFTER_DESCENDANTS || 811 // No focusable descendants 812 (focusableCount == views.size())) { 813 super.addFocusables(views, direction, focusableMode); 814 } 815 } 816 817 @Override 818 public void findViewsWithText(ArrayList<View> outViews, CharSequence text, int flags) { 819 super.findViewsWithText(outViews, text, flags); 820 final int childrenCount = mChildrenCount; 821 final View[] children = mChildren; 822 for (int i = 0; i < childrenCount; i++) { 823 View child = children[i]; 824 if ((child.mViewFlags & VISIBILITY_MASK) == VISIBLE 825 && (child.mPrivateFlags & IS_ROOT_NAMESPACE) == 0) { 826 child.findViewsWithText(outViews, text, flags); 827 } 828 } 829 } 830 831 @Override 832 View findViewByAccessibilityIdTraversal(int accessibilityId) { 833 View foundView = super.findViewByAccessibilityIdTraversal(accessibilityId); 834 if (foundView != null) { 835 return foundView; 836 } 837 final int childrenCount = mChildrenCount; 838 final View[] children = mChildren; 839 for (int i = 0; i < childrenCount; i++) { 840 View child = children[i]; 841 foundView = child.findViewByAccessibilityIdTraversal(accessibilityId); 842 if (foundView != null) { 843 return foundView; 844 } 845 } 846 return null; 847 } 848 849 /** 850 * {@inheritDoc} 851 */ 852 @Override 853 public void dispatchWindowFocusChanged(boolean hasFocus) { 854 super.dispatchWindowFocusChanged(hasFocus); 855 final int count = mChildrenCount; 856 final View[] children = mChildren; 857 for (int i = 0; i < count; i++) { 858 children[i].dispatchWindowFocusChanged(hasFocus); 859 } 860 } 861 862 /** 863 * {@inheritDoc} 864 */ 865 @Override 866 public void addTouchables(ArrayList<View> views) { 867 super.addTouchables(views); 868 869 final int count = mChildrenCount; 870 final View[] children = mChildren; 871 872 for (int i = 0; i < count; i++) { 873 final View child = children[i]; 874 if ((child.mViewFlags & VISIBILITY_MASK) == VISIBLE) { 875 child.addTouchables(views); 876 } 877 } 878 } 879 880 /** 881 * {@inheritDoc} 882 */ 883 @Override 884 public void dispatchDisplayHint(int hint) { 885 super.dispatchDisplayHint(hint); 886 final int count = mChildrenCount; 887 final View[] children = mChildren; 888 for (int i = 0; i < count; i++) { 889 children[i].dispatchDisplayHint(hint); 890 } 891 } 892 893 /** 894 * Called when a view's visibility has changed. Notify the parent to take any appropriate 895 * action. 896 * 897 * @param child The view whose visibility has changed 898 * @param oldVisibility The previous visibility value (GONE, INVISIBLE, or VISIBLE). 899 * @param newVisibility The new visibility value (GONE, INVISIBLE, or VISIBLE). 900 * @hide 901 */ 902 protected void onChildVisibilityChanged(View child, int oldVisibility, int newVisibility) { 903 if (mTransition != null) { 904 if (newVisibility == VISIBLE) { 905 mTransition.showChild(this, child, oldVisibility); 906 } else { 907 mTransition.hideChild(this, child, newVisibility); 908 // Only track this on disappearing views - appearing views are already visible 909 // and don't need special handling during drawChild() 910 if (mVisibilityChangingChildren == null) { 911 mVisibilityChangingChildren = new ArrayList<View>(); 912 } 913 mVisibilityChangingChildren.add(child); 914 if (mTransitioningViews != null && mTransitioningViews.contains(child)) { 915 addDisappearingView(child); 916 } 917 } 918 } 919 920 // in all cases, for drags 921 if (mCurrentDrag != null) { 922 if (newVisibility == VISIBLE) { 923 notifyChildOfDrag(child); 924 } 925 } 926 } 927 928 /** 929 * {@inheritDoc} 930 */ 931 @Override 932 protected void dispatchVisibilityChanged(View changedView, int visibility) { 933 super.dispatchVisibilityChanged(changedView, visibility); 934 final int count = mChildrenCount; 935 final View[] children = mChildren; 936 for (int i = 0; i < count; i++) { 937 children[i].dispatchVisibilityChanged(changedView, visibility); 938 } 939 } 940 941 /** 942 * {@inheritDoc} 943 */ 944 @Override 945 public void dispatchWindowVisibilityChanged(int visibility) { 946 super.dispatchWindowVisibilityChanged(visibility); 947 final int count = mChildrenCount; 948 final View[] children = mChildren; 949 for (int i = 0; i < count; i++) { 950 children[i].dispatchWindowVisibilityChanged(visibility); 951 } 952 } 953 954 /** 955 * {@inheritDoc} 956 */ 957 @Override 958 public void dispatchConfigurationChanged(Configuration newConfig) { 959 super.dispatchConfigurationChanged(newConfig); 960 final int count = mChildrenCount; 961 final View[] children = mChildren; 962 for (int i = 0; i < count; i++) { 963 children[i].dispatchConfigurationChanged(newConfig); 964 } 965 } 966 967 /** 968 * {@inheritDoc} 969 */ 970 public void recomputeViewAttributes(View child) { 971 if (mAttachInfo != null && !mAttachInfo.mRecomputeGlobalAttributes) { 972 ViewParent parent = mParent; 973 if (parent != null) parent.recomputeViewAttributes(this); 974 } 975 } 976 977 @Override 978 void dispatchCollectViewAttributes(int visibility) { 979 visibility |= mViewFlags&VISIBILITY_MASK; 980 super.dispatchCollectViewAttributes(visibility); 981 final int count = mChildrenCount; 982 final View[] children = mChildren; 983 for (int i = 0; i < count; i++) { 984 children[i].dispatchCollectViewAttributes(visibility); 985 } 986 } 987 988 /** 989 * {@inheritDoc} 990 */ 991 public void bringChildToFront(View child) { 992 int index = indexOfChild(child); 993 if (index >= 0) { 994 removeFromArray(index); 995 addInArray(child, mChildrenCount); 996 child.mParent = this; 997 } 998 } 999 1000 /** 1001 * {@inheritDoc} 1002 * 1003 * !!! TODO: write real docs 1004 */ 1005 @Override 1006 public boolean dispatchDragEvent(DragEvent event) { 1007 boolean retval = false; 1008 final float tx = event.mX; 1009 final float ty = event.mY; 1010 1011 ViewRootImpl root = getViewRootImpl(); 1012 1013 // Dispatch down the view hierarchy 1014 switch (event.mAction) { 1015 case DragEvent.ACTION_DRAG_STARTED: { 1016 // clear state to recalculate which views we drag over 1017 mCurrentDragView = null; 1018 1019 // Set up our tracking of drag-started notifications 1020 mCurrentDrag = DragEvent.obtain(event); 1021 if (mDragNotifiedChildren == null) { 1022 mDragNotifiedChildren = new HashSet<View>(); 1023 } else { 1024 mDragNotifiedChildren.clear(); 1025 } 1026 1027 // Now dispatch down to our children, caching the responses 1028 mChildAcceptsDrag = false; 1029 final int count = mChildrenCount; 1030 final View[] children = mChildren; 1031 for (int i = 0; i < count; i++) { 1032 final View child = children[i]; 1033 child.mPrivateFlags2 &= ~View.DRAG_MASK; 1034 if (child.getVisibility() == VISIBLE) { 1035 final boolean handled = notifyChildOfDrag(children[i]); 1036 if (handled) { 1037 mChildAcceptsDrag = true; 1038 } 1039 } 1040 } 1041 1042 // Return HANDLED if one of our children can accept the drag 1043 if (mChildAcceptsDrag) { 1044 retval = true; 1045 } 1046 } break; 1047 1048 case DragEvent.ACTION_DRAG_ENDED: { 1049 // Release the bookkeeping now that the drag lifecycle has ended 1050 if (mDragNotifiedChildren != null) { 1051 for (View child : mDragNotifiedChildren) { 1052 // If a child was notified about an ongoing drag, it's told that it's over 1053 child.dispatchDragEvent(event); 1054 child.mPrivateFlags2 &= ~View.DRAG_MASK; 1055 child.refreshDrawableState(); 1056 } 1057 1058 mDragNotifiedChildren.clear(); 1059 mCurrentDrag.recycle(); 1060 mCurrentDrag = null; 1061 } 1062 1063 // We consider drag-ended to have been handled if one of our children 1064 // had offered to handle the drag. 1065 if (mChildAcceptsDrag) { 1066 retval = true; 1067 } 1068 } break; 1069 1070 case DragEvent.ACTION_DRAG_LOCATION: { 1071 // Find the [possibly new] drag target 1072 final View target = findFrontmostDroppableChildAt(event.mX, event.mY, mLocalPoint); 1073 1074 // If we've changed apparent drag target, tell the view root which view 1075 // we're over now [for purposes of the eventual drag-recipient-changed 1076 // notifications to the framework] and tell the new target that the drag 1077 // has entered its bounds. The root will see setDragFocus() calls all 1078 // the way down to the final leaf view that is handling the LOCATION event 1079 // before reporting the new potential recipient to the framework. 1080 if (mCurrentDragView != target) { 1081 root.setDragFocus(target); 1082 1083 final int action = event.mAction; 1084 // If we've dragged off of a child view, send it the EXITED message 1085 if (mCurrentDragView != null) { 1086 final View view = mCurrentDragView; 1087 event.mAction = DragEvent.ACTION_DRAG_EXITED; 1088 view.dispatchDragEvent(event); 1089 view.mPrivateFlags2 &= ~View.DRAG_HOVERED; 1090 view.refreshDrawableState(); 1091 } 1092 mCurrentDragView = target; 1093 1094 // If we've dragged over a new child view, send it the ENTERED message 1095 if (target != null) { 1096 event.mAction = DragEvent.ACTION_DRAG_ENTERED; 1097 target.dispatchDragEvent(event); 1098 target.mPrivateFlags2 |= View.DRAG_HOVERED; 1099 target.refreshDrawableState(); 1100 } 1101 event.mAction = action; // restore the event's original state 1102 } 1103 1104 // Dispatch the actual drag location notice, localized into its coordinates 1105 if (target != null) { 1106 event.mX = mLocalPoint.x; 1107 event.mY = mLocalPoint.y; 1108 1109 retval = target.dispatchDragEvent(event); 1110 1111 event.mX = tx; 1112 event.mY = ty; 1113 } 1114 } break; 1115 1116 /* Entered / exited dispatch 1117 * 1118 * DRAG_ENTERED is not dispatched downwards from ViewGroup. The reason for this is 1119 * that we're about to get the corresponding LOCATION event, which we will use to 1120 * determine which of our children is the new target; at that point we will 1121 * push a DRAG_ENTERED down to the new target child [which may itself be a ViewGroup]. 1122 * 1123 * DRAG_EXITED *is* dispatched all the way down immediately: once we know the 1124 * drag has left this ViewGroup, we know by definition that every contained subview 1125 * is also no longer under the drag point. 1126 */ 1127 1128 case DragEvent.ACTION_DRAG_EXITED: { 1129 if (mCurrentDragView != null) { 1130 final View view = mCurrentDragView; 1131 view.dispatchDragEvent(event); 1132 view.mPrivateFlags2 &= ~View.DRAG_HOVERED; 1133 view.refreshDrawableState(); 1134 1135 mCurrentDragView = null; 1136 } 1137 } break; 1138 1139 case DragEvent.ACTION_DROP: { 1140 if (ViewDebug.DEBUG_DRAG) Log.d(View.VIEW_LOG_TAG, "Drop event: " + event); 1141 View target = findFrontmostDroppableChildAt(event.mX, event.mY, mLocalPoint); 1142 if (target != null) { 1143 if (ViewDebug.DEBUG_DRAG) Log.d(View.VIEW_LOG_TAG, " dispatch drop to " + target); 1144 event.mX = mLocalPoint.x; 1145 event.mY = mLocalPoint.y; 1146 retval = target.dispatchDragEvent(event); 1147 event.mX = tx; 1148 event.mY = ty; 1149 } else { 1150 if (ViewDebug.DEBUG_DRAG) { 1151 Log.d(View.VIEW_LOG_TAG, " not dropped on an accepting view"); 1152 } 1153 } 1154 } break; 1155 } 1156 1157 // If none of our children could handle the event, try here 1158 if (!retval) { 1159 // Call up to the View implementation that dispatches to installed listeners 1160 retval = super.dispatchDragEvent(event); 1161 } 1162 return retval; 1163 } 1164 1165 // Find the frontmost child view that lies under the given point, and calculate 1166 // the position within its own local coordinate system. 1167 View findFrontmostDroppableChildAt(float x, float y, PointF outLocalPoint) { 1168 final int count = mChildrenCount; 1169 final View[] children = mChildren; 1170 for (int i = count - 1; i >= 0; i--) { 1171 final View child = children[i]; 1172 if (!child.canAcceptDrag()) { 1173 continue; 1174 } 1175 1176 if (isTransformedTouchPointInView(x, y, child, outLocalPoint)) { 1177 return child; 1178 } 1179 } 1180 return null; 1181 } 1182 1183 boolean notifyChildOfDrag(View child) { 1184 if (ViewDebug.DEBUG_DRAG) { 1185 Log.d(View.VIEW_LOG_TAG, "Sending drag-started to view: " + child); 1186 } 1187 1188 boolean canAccept = false; 1189 if (! mDragNotifiedChildren.contains(child)) { 1190 mDragNotifiedChildren.add(child); 1191 canAccept = child.dispatchDragEvent(mCurrentDrag); 1192 if (canAccept && !child.canAcceptDrag()) { 1193 child.mPrivateFlags2 |= View.DRAG_CAN_ACCEPT; 1194 child.refreshDrawableState(); 1195 } 1196 } 1197 return canAccept; 1198 } 1199 1200 @Override 1201 public void dispatchSystemUiVisibilityChanged(int visible) { 1202 super.dispatchSystemUiVisibilityChanged(visible); 1203 1204 final int count = mChildrenCount; 1205 final View[] children = mChildren; 1206 for (int i=0; i <count; i++) { 1207 final View child = children[i]; 1208 child.dispatchSystemUiVisibilityChanged(visible); 1209 } 1210 } 1211 1212 @Override 1213 void updateLocalSystemUiVisibility(int localValue, int localChanges) { 1214 super.updateLocalSystemUiVisibility(localValue, localChanges); 1215 1216 final int count = mChildrenCount; 1217 final View[] children = mChildren; 1218 for (int i=0; i <count; i++) { 1219 final View child = children[i]; 1220 child.updateLocalSystemUiVisibility(localValue, localChanges); 1221 } 1222 } 1223 1224 /** 1225 * {@inheritDoc} 1226 */ 1227 @Override 1228 public boolean dispatchKeyEventPreIme(KeyEvent event) { 1229 if ((mPrivateFlags & (FOCUSED | HAS_BOUNDS)) == (FOCUSED | HAS_BOUNDS)) { 1230 return super.dispatchKeyEventPreIme(event); 1231 } else if (mFocused != null && (mFocused.mPrivateFlags & HAS_BOUNDS) == HAS_BOUNDS) { 1232 return mFocused.dispatchKeyEventPreIme(event); 1233 } 1234 return false; 1235 } 1236 1237 /** 1238 * {@inheritDoc} 1239 */ 1240 @Override 1241 public boolean dispatchKeyEvent(KeyEvent event) { 1242 if (mInputEventConsistencyVerifier != null) { 1243 mInputEventConsistencyVerifier.onKeyEvent(event, 1); 1244 } 1245 1246 if ((mPrivateFlags & (FOCUSED | HAS_BOUNDS)) == (FOCUSED | HAS_BOUNDS)) { 1247 if (super.dispatchKeyEvent(event)) { 1248 return true; 1249 } 1250 } else if (mFocused != null && (mFocused.mPrivateFlags & HAS_BOUNDS) == HAS_BOUNDS) { 1251 if (mFocused.dispatchKeyEvent(event)) { 1252 return true; 1253 } 1254 } 1255 1256 if (mInputEventConsistencyVerifier != null) { 1257 mInputEventConsistencyVerifier.onUnhandledEvent(event, 1); 1258 } 1259 return false; 1260 } 1261 1262 /** 1263 * {@inheritDoc} 1264 */ 1265 @Override 1266 public boolean dispatchKeyShortcutEvent(KeyEvent event) { 1267 if ((mPrivateFlags & (FOCUSED | HAS_BOUNDS)) == (FOCUSED | HAS_BOUNDS)) { 1268 return super.dispatchKeyShortcutEvent(event); 1269 } else if (mFocused != null && (mFocused.mPrivateFlags & HAS_BOUNDS) == HAS_BOUNDS) { 1270 return mFocused.dispatchKeyShortcutEvent(event); 1271 } 1272 return false; 1273 } 1274 1275 /** 1276 * {@inheritDoc} 1277 */ 1278 @Override 1279 public boolean dispatchTrackballEvent(MotionEvent event) { 1280 if (mInputEventConsistencyVerifier != null) { 1281 mInputEventConsistencyVerifier.onTrackballEvent(event, 1); 1282 } 1283 1284 if ((mPrivateFlags & (FOCUSED | HAS_BOUNDS)) == (FOCUSED | HAS_BOUNDS)) { 1285 if (super.dispatchTrackballEvent(event)) { 1286 return true; 1287 } 1288 } else if (mFocused != null && (mFocused.mPrivateFlags & HAS_BOUNDS) == HAS_BOUNDS) { 1289 if (mFocused.dispatchTrackballEvent(event)) { 1290 return true; 1291 } 1292 } 1293 1294 if (mInputEventConsistencyVerifier != null) { 1295 mInputEventConsistencyVerifier.onUnhandledEvent(event, 1); 1296 } 1297 return false; 1298 } 1299 1300 /** 1301 * {@inheritDoc} 1302 */ 1303 @SuppressWarnings({"ConstantConditions"}) 1304 @Override 1305 protected boolean dispatchHoverEvent(MotionEvent event) { 1306 final int action = event.getAction(); 1307 1308 // First check whether the view group wants to intercept the hover event. 1309 final boolean interceptHover = onInterceptHoverEvent(event); 1310 event.setAction(action); // restore action in case it was changed 1311 1312 MotionEvent eventNoHistory = event; 1313 boolean handled = false; 1314 1315 // Send events to the hovered children and build a new list of hover targets until 1316 // one is found that handles the event. 1317 HoverTarget firstOldHoverTarget = mFirstHoverTarget; 1318 mFirstHoverTarget = null; 1319 if (!interceptHover && action != MotionEvent.ACTION_HOVER_EXIT) { 1320 final float x = event.getX(); 1321 final float y = event.getY(); 1322 final int childrenCount = mChildrenCount; 1323 if (childrenCount != 0) { 1324 final View[] children = mChildren; 1325 HoverTarget lastHoverTarget = null; 1326 for (int i = childrenCount - 1; i >= 0; i--) { 1327 final View child = children[i]; 1328 if (!canViewReceivePointerEvents(child) 1329 || !isTransformedTouchPointInView(x, y, child, null)) { 1330 continue; 1331 } 1332 1333 // Obtain a hover target for this child. Dequeue it from the 1334 // old hover target list if the child was previously hovered. 1335 HoverTarget hoverTarget = firstOldHoverTarget; 1336 final boolean wasHovered; 1337 for (HoverTarget predecessor = null; ;) { 1338 if (hoverTarget == null) { 1339 hoverTarget = HoverTarget.obtain(child); 1340 wasHovered = false; 1341 break; 1342 } 1343 1344 if (hoverTarget.child == child) { 1345 if (predecessor != null) { 1346 predecessor.next = hoverTarget.next; 1347 } else { 1348 firstOldHoverTarget = hoverTarget.next; 1349 } 1350 hoverTarget.next = null; 1351 wasHovered = true; 1352 break; 1353 } 1354 1355 predecessor = hoverTarget; 1356 hoverTarget = hoverTarget.next; 1357 } 1358 1359 // Enqueue the hover target onto the new hover target list. 1360 if (lastHoverTarget != null) { 1361 lastHoverTarget.next = hoverTarget; 1362 } else { 1363 lastHoverTarget = hoverTarget; 1364 mFirstHoverTarget = hoverTarget; 1365 } 1366 1367 // Dispatch the event to the child. 1368 if (action == MotionEvent.ACTION_HOVER_ENTER) { 1369 if (!wasHovered) { 1370 // Send the enter as is. 1371 handled |= dispatchTransformedGenericPointerEvent( 1372 event, child); // enter 1373 } 1374 } else if (action == MotionEvent.ACTION_HOVER_MOVE) { 1375 if (!wasHovered) { 1376 // Synthesize an enter from a move. 1377 eventNoHistory = obtainMotionEventNoHistoryOrSelf(eventNoHistory); 1378 eventNoHistory.setAction(MotionEvent.ACTION_HOVER_ENTER); 1379 handled |= dispatchTransformedGenericPointerEvent( 1380 eventNoHistory, child); // enter 1381 eventNoHistory.setAction(action); 1382 1383 handled |= dispatchTransformedGenericPointerEvent( 1384 eventNoHistory, child); // move 1385 } else { 1386 // Send the move as is. 1387 handled |= dispatchTransformedGenericPointerEvent(event, child); 1388 } 1389 } 1390 if (handled) { 1391 break; 1392 } 1393 } 1394 } 1395 } 1396 1397 // Send exit events to all previously hovered children that are no longer hovered. 1398 while (firstOldHoverTarget != null) { 1399 final View child = firstOldHoverTarget.child; 1400 1401 // Exit the old hovered child. 1402 if (action == MotionEvent.ACTION_HOVER_EXIT) { 1403 // Send the exit as is. 1404 handled |= dispatchTransformedGenericPointerEvent( 1405 event, child); // exit 1406 } else { 1407 // Synthesize an exit from a move or enter. 1408 // Ignore the result because hover focus has moved to a different view. 1409 if (action == MotionEvent.ACTION_HOVER_MOVE) { 1410 dispatchTransformedGenericPointerEvent( 1411 event, child); // move 1412 } 1413 eventNoHistory = obtainMotionEventNoHistoryOrSelf(eventNoHistory); 1414 eventNoHistory.setAction(MotionEvent.ACTION_HOVER_EXIT); 1415 dispatchTransformedGenericPointerEvent( 1416 eventNoHistory, child); // exit 1417 eventNoHistory.setAction(action); 1418 } 1419 1420 final HoverTarget nextOldHoverTarget = firstOldHoverTarget.next; 1421 firstOldHoverTarget.recycle(); 1422 firstOldHoverTarget = nextOldHoverTarget; 1423 } 1424 1425 // Send events to the view group itself if no children have handled it. 1426 boolean newHoveredSelf = !handled; 1427 if (newHoveredSelf == mHoveredSelf) { 1428 if (newHoveredSelf) { 1429 // Send event to the view group as before. 1430 handled |= super.dispatchHoverEvent(event); 1431 } 1432 } else { 1433 if (mHoveredSelf) { 1434 // Exit the view group. 1435 if (action == MotionEvent.ACTION_HOVER_EXIT) { 1436 // Send the exit as is. 1437 handled |= super.dispatchHoverEvent(event); // exit 1438 } else { 1439 // Synthesize an exit from a move or enter. 1440 // Ignore the result because hover focus is moving to a different view. 1441 if (action == MotionEvent.ACTION_HOVER_MOVE) { 1442 super.dispatchHoverEvent(event); // move 1443 } 1444 eventNoHistory = obtainMotionEventNoHistoryOrSelf(eventNoHistory); 1445 eventNoHistory.setAction(MotionEvent.ACTION_HOVER_EXIT); 1446 super.dispatchHoverEvent(eventNoHistory); // exit 1447 eventNoHistory.setAction(action); 1448 } 1449 mHoveredSelf = false; 1450 } 1451 1452 if (newHoveredSelf) { 1453 // Enter the view group. 1454 if (action == MotionEvent.ACTION_HOVER_ENTER) { 1455 // Send the enter as is. 1456 handled |= super.dispatchHoverEvent(event); // enter 1457 mHoveredSelf = true; 1458 } else if (action == MotionEvent.ACTION_HOVER_MOVE) { 1459 // Synthesize an enter from a move. 1460 eventNoHistory = obtainMotionEventNoHistoryOrSelf(eventNoHistory); 1461 eventNoHistory.setAction(MotionEvent.ACTION_HOVER_ENTER); 1462 handled |= super.dispatchHoverEvent(eventNoHistory); // enter 1463 eventNoHistory.setAction(action); 1464 1465 handled |= super.dispatchHoverEvent(eventNoHistory); // move 1466 mHoveredSelf = true; 1467 } 1468 } 1469 } 1470 1471 // Recycle the copy of the event that we made. 1472 if (eventNoHistory != event) { 1473 eventNoHistory.recycle(); 1474 } 1475 1476 // Done. 1477 return handled; 1478 } 1479 1480 /** @hide */ 1481 @Override 1482 protected boolean hasHoveredChild() { 1483 return mFirstHoverTarget != null; 1484 } 1485 1486 /** 1487 * Implement this method to intercept hover events before they are handled 1488 * by child views. 1489 * <p> 1490 * This method is called before dispatching a hover event to a child of 1491 * the view group or to the view group's own {@link #onHoverEvent} to allow 1492 * the view group a chance to intercept the hover event. 1493 * This method can also be used to watch all pointer motions that occur within 1494 * the bounds of the view group even when the pointer is hovering over 1495 * a child of the view group rather than over the view group itself. 1496 * </p><p> 1497 * The view group can prevent its children from receiving hover events by 1498 * implementing this method and returning <code>true</code> to indicate 1499 * that it would like to intercept hover events. The view group must 1500 * continuously return <code>true</code> from {@link #onInterceptHoverEvent} 1501 * for as long as it wishes to continue intercepting hover events from 1502 * its children. 1503 * </p><p> 1504 * Interception preserves the invariant that at most one view can be 1505 * hovered at a time by transferring hover focus from the currently hovered 1506 * child to the view group or vice-versa as needed. 1507 * </p><p> 1508 * If this method returns <code>true</code> and a child is already hovered, then the 1509 * child view will first receive a hover exit event and then the view group 1510 * itself will receive a hover enter event in {@link #onHoverEvent}. 1511 * Likewise, if this method had previously returned <code>true</code> to intercept hover 1512 * events and instead returns <code>false</code> while the pointer is hovering 1513 * within the bounds of one of a child, then the view group will first receive a 1514 * hover exit event in {@link #onHoverEvent} and then the hovered child will 1515 * receive a hover enter event. 1516 * </p><p> 1517 * The default implementation always returns false. 1518 * </p> 1519 * 1520 * @param event The motion event that describes the hover. 1521 * @return True if the view group would like to intercept the hover event 1522 * and prevent its children from receiving it. 1523 */ 1524 public boolean onInterceptHoverEvent(MotionEvent event) { 1525 return false; 1526 } 1527 1528 private static MotionEvent obtainMotionEventNoHistoryOrSelf(MotionEvent event) { 1529 if (event.getHistorySize() == 0) { 1530 return event; 1531 } 1532 return MotionEvent.obtainNoHistory(event); 1533 } 1534 1535 /** 1536 * {@inheritDoc} 1537 */ 1538 @Override 1539 protected boolean dispatchGenericPointerEvent(MotionEvent event) { 1540 // Send the event to the child under the pointer. 1541 final int childrenCount = mChildrenCount; 1542 if (childrenCount != 0) { 1543 final View[] children = mChildren; 1544 final float x = event.getX(); 1545 final float y = event.getY(); 1546 1547 for (int i = childrenCount - 1; i >= 0; i--) { 1548 final View child = children[i]; 1549 if (!canViewReceivePointerEvents(child) 1550 || !isTransformedTouchPointInView(x, y, child, null)) { 1551 continue; 1552 } 1553 1554 if (dispatchTransformedGenericPointerEvent(event, child)) { 1555 return true; 1556 } 1557 } 1558 } 1559 1560 // No child handled the event. Send it to this view group. 1561 return super.dispatchGenericPointerEvent(event); 1562 } 1563 1564 /** 1565 * {@inheritDoc} 1566 */ 1567 @Override 1568 protected boolean dispatchGenericFocusedEvent(MotionEvent event) { 1569 // Send the event to the focused child or to this view group if it has focus. 1570 if ((mPrivateFlags & (FOCUSED | HAS_BOUNDS)) == (FOCUSED | HAS_BOUNDS)) { 1571 return super.dispatchGenericFocusedEvent(event); 1572 } else if (mFocused != null && (mFocused.mPrivateFlags & HAS_BOUNDS) == HAS_BOUNDS) { 1573 return mFocused.dispatchGenericMotionEvent(event); 1574 } 1575 return false; 1576 } 1577 1578 /** 1579 * Dispatches a generic pointer event to a child, taking into account 1580 * transformations that apply to the child. 1581 * 1582 * @param event The event to send. 1583 * @param child The view to send the event to. 1584 * @return {@code true} if the child handled the event. 1585 */ 1586 private boolean dispatchTransformedGenericPointerEvent(MotionEvent event, View child) { 1587 final float offsetX = mScrollX - child.mLeft; 1588 final float offsetY = mScrollY - child.mTop; 1589 1590 boolean handled; 1591 if (!child.hasIdentityMatrix()) { 1592 MotionEvent transformedEvent = MotionEvent.obtain(event); 1593 transformedEvent.offsetLocation(offsetX, offsetY); 1594 transformedEvent.transform(child.getInverseMatrix()); 1595 handled = child.dispatchGenericMotionEvent(transformedEvent); 1596 transformedEvent.recycle(); 1597 } else { 1598 event.offsetLocation(offsetX, offsetY); 1599 handled = child.dispatchGenericMotionEvent(event); 1600 event.offsetLocation(-offsetX, -offsetY); 1601 } 1602 return handled; 1603 } 1604 1605 /** 1606 * {@inheritDoc} 1607 */ 1608 @Override 1609 public boolean dispatchTouchEvent(MotionEvent ev) { 1610 if (mInputEventConsistencyVerifier != null) { 1611 mInputEventConsistencyVerifier.onTouchEvent(ev, 1); 1612 } 1613 1614 boolean handled = false; 1615 if (onFilterTouchEventForSecurity(ev)) { 1616 final int action = ev.getAction(); 1617 final int actionMasked = action & MotionEvent.ACTION_MASK; 1618 1619 // Handle an initial down. 1620 if (actionMasked == MotionEvent.ACTION_DOWN) { 1621 // Throw away all previous state when starting a new touch gesture. 1622 // The framework may have dropped the up or cancel event for the previous gesture 1623 // due to an app switch, ANR, or some other state change. 1624 cancelAndClearTouchTargets(ev); 1625 resetTouchState(); 1626 } 1627 1628 // Check for interception. 1629 final boolean intercepted; 1630 if (actionMasked == MotionEvent.ACTION_DOWN 1631 || mFirstTouchTarget != null) { 1632 final boolean disallowIntercept = (mGroupFlags & FLAG_DISALLOW_INTERCEPT) != 0; 1633 if (!disallowIntercept) { 1634 intercepted = onInterceptTouchEvent(ev); 1635 ev.setAction(action); // restore action in case it was changed 1636 } else { 1637 intercepted = false; 1638 } 1639 } else { 1640 // There are no touch targets and this action is not an initial down 1641 // so this view group continues to intercept touches. 1642 intercepted = true; 1643 } 1644 1645 // Check for cancelation. 1646 final boolean canceled = resetCancelNextUpFlag(this) 1647 || actionMasked == MotionEvent.ACTION_CANCEL; 1648 1649 // Update list of touch targets for pointer down, if needed. 1650 final boolean split = (mGroupFlags & FLAG_SPLIT_MOTION_EVENTS) != 0; 1651 TouchTarget newTouchTarget = null; 1652 boolean alreadyDispatchedToNewTouchTarget = false; 1653 if (!canceled && !intercepted) { 1654 if (actionMasked == MotionEvent.ACTION_DOWN 1655 || (split && actionMasked == MotionEvent.ACTION_POINTER_DOWN) 1656 || actionMasked == MotionEvent.ACTION_HOVER_MOVE) { 1657 final int actionIndex = ev.getActionIndex(); // always 0 for down 1658 final int idBitsToAssign = split ? 1 << ev.getPointerId(actionIndex) 1659 : TouchTarget.ALL_POINTER_IDS; 1660 1661 // Clean up earlier touch targets for this pointer id in case they 1662 // have become out of sync. 1663 removePointersFromTouchTargets(idBitsToAssign); 1664 1665 final int childrenCount = mChildrenCount; 1666 if (childrenCount != 0) { 1667 // Find a child that can receive the event. 1668 // Scan children from front to back. 1669 final View[] children = mChildren; 1670 final float x = ev.getX(actionIndex); 1671 final float y = ev.getY(actionIndex); 1672 1673 for (int i = childrenCount - 1; i >= 0; i--) { 1674 final View child = children[i]; 1675 if (!canViewReceivePointerEvents(child) 1676 || !isTransformedTouchPointInView(x, y, child, null)) { 1677 continue; 1678 } 1679 1680 newTouchTarget = getTouchTarget(child); 1681 if (newTouchTarget != null) { 1682 // Child is already receiving touch within its bounds. 1683 // Give it the new pointer in addition to the ones it is handling. 1684 newTouchTarget.pointerIdBits |= idBitsToAssign; 1685 break; 1686 } 1687 1688 resetCancelNextUpFlag(child); 1689 if (dispatchTransformedTouchEvent(ev, false, child, idBitsToAssign)) { 1690 // Child wants to receive touch within its bounds. 1691 mLastTouchDownTime = ev.getDownTime(); 1692 mLastTouchDownIndex = i; 1693 mLastTouchDownX = ev.getX(); 1694 mLastTouchDownY = ev.getY(); 1695 newTouchTarget = addTouchTarget(child, idBitsToAssign); 1696 alreadyDispatchedToNewTouchTarget = true; 1697 break; 1698 } 1699 } 1700 } 1701 1702 if (newTouchTarget == null && mFirstTouchTarget != null) { 1703 // Did not find a child to receive the event. 1704 // Assign the pointer to the least recently added target. 1705 newTouchTarget = mFirstTouchTarget; 1706 while (newTouchTarget.next != null) { 1707 newTouchTarget = newTouchTarget.next; 1708 } 1709 newTouchTarget.pointerIdBits |= idBitsToAssign; 1710 } 1711 } 1712 } 1713 1714 // Dispatch to touch targets. 1715 if (mFirstTouchTarget == null) { 1716 // No touch targets so treat this as an ordinary view. 1717 handled = dispatchTransformedTouchEvent(ev, canceled, null, 1718 TouchTarget.ALL_POINTER_IDS); 1719 } else { 1720 // Dispatch to touch targets, excluding the new touch target if we already 1721 // dispatched to it. Cancel touch targets if necessary. 1722 TouchTarget predecessor = null; 1723 TouchTarget target = mFirstTouchTarget; 1724 while (target != null) { 1725 final TouchTarget next = target.next; 1726 if (alreadyDispatchedToNewTouchTarget && target == newTouchTarget) { 1727 handled = true; 1728 } else { 1729 final boolean cancelChild = resetCancelNextUpFlag(target.child) 1730 || intercepted; 1731 if (dispatchTransformedTouchEvent(ev, cancelChild, 1732 target.child, target.pointerIdBits)) { 1733 handled = true; 1734 } 1735 if (cancelChild) { 1736 if (predecessor == null) { 1737 mFirstTouchTarget = next; 1738 } else { 1739 predecessor.next = next; 1740 } 1741 target.recycle(); 1742 target = next; 1743 continue; 1744 } 1745 } 1746 predecessor = target; 1747 target = next; 1748 } 1749 } 1750 1751 // Update list of touch targets for pointer up or cancel, if needed. 1752 if (canceled 1753 || actionMasked == MotionEvent.ACTION_UP 1754 || actionMasked == MotionEvent.ACTION_HOVER_MOVE) { 1755 resetTouchState(); 1756 } else if (split && actionMasked == MotionEvent.ACTION_POINTER_UP) { 1757 final int actionIndex = ev.getActionIndex(); 1758 final int idBitsToRemove = 1 << ev.getPointerId(actionIndex); 1759 removePointersFromTouchTargets(idBitsToRemove); 1760 } 1761 } 1762 1763 if (!handled && mInputEventConsistencyVerifier != null) { 1764 mInputEventConsistencyVerifier.onUnhandledEvent(ev, 1); 1765 } 1766 return handled; 1767 } 1768 1769 /** 1770 * Resets all touch state in preparation for a new cycle. 1771 */ 1772 private void resetTouchState() { 1773 clearTouchTargets(); 1774 resetCancelNextUpFlag(this); 1775 mGroupFlags &= ~FLAG_DISALLOW_INTERCEPT; 1776 } 1777 1778 /** 1779 * Resets the cancel next up flag. 1780 * Returns true if the flag was previously set. 1781 */ 1782 private boolean resetCancelNextUpFlag(View view) { 1783 if ((view.mPrivateFlags & CANCEL_NEXT_UP_EVENT) != 0) { 1784 view.mPrivateFlags &= ~CANCEL_NEXT_UP_EVENT; 1785 return true; 1786 } 1787 return false; 1788 } 1789 1790 /** 1791 * Clears all touch targets. 1792 */ 1793 private void clearTouchTargets() { 1794 TouchTarget target = mFirstTouchTarget; 1795 if (target != null) { 1796 do { 1797 TouchTarget next = target.next; 1798 target.recycle(); 1799 target = next; 1800 } while (target != null); 1801 mFirstTouchTarget = null; 1802 } 1803 } 1804 1805 /** 1806 * Cancels and clears all touch targets. 1807 */ 1808 private void cancelAndClearTouchTargets(MotionEvent event) { 1809 if (mFirstTouchTarget != null) { 1810 boolean syntheticEvent = false; 1811 if (event == null) { 1812 final long now = SystemClock.uptimeMillis(); 1813 event = MotionEvent.obtain(now, now, 1814 MotionEvent.ACTION_CANCEL, 0.0f, 0.0f, 0); 1815 event.setSource(InputDevice.SOURCE_TOUCHSCREEN); 1816 syntheticEvent = true; 1817 } 1818 1819 for (TouchTarget target = mFirstTouchTarget; target != null; target = target.next) { 1820 resetCancelNextUpFlag(target.child); 1821 dispatchTransformedTouchEvent(event, true, target.child, target.pointerIdBits); 1822 } 1823 clearTouchTargets(); 1824 1825 if (syntheticEvent) { 1826 event.recycle(); 1827 } 1828 } 1829 } 1830 1831 /** 1832 * Gets the touch target for specified child view. 1833 * Returns null if not found. 1834 */ 1835 private TouchTarget getTouchTarget(View child) { 1836 for (TouchTarget target = mFirstTouchTarget; target != null; target = target.next) { 1837 if (target.child == child) { 1838 return target; 1839 } 1840 } 1841 return null; 1842 } 1843 1844 /** 1845 * Adds a touch target for specified child to the beginning of the list. 1846 * Assumes the target child is not already present. 1847 */ 1848 private TouchTarget addTouchTarget(View child, int pointerIdBits) { 1849 TouchTarget target = TouchTarget.obtain(child, pointerIdBits); 1850 target.next = mFirstTouchTarget; 1851 mFirstTouchTarget = target; 1852 return target; 1853 } 1854 1855 /** 1856 * Removes the pointer ids from consideration. 1857 */ 1858 private void removePointersFromTouchTargets(int pointerIdBits) { 1859 TouchTarget predecessor = null; 1860 TouchTarget target = mFirstTouchTarget; 1861 while (target != null) { 1862 final TouchTarget next = target.next; 1863 if ((target.pointerIdBits & pointerIdBits) != 0) { 1864 target.pointerIdBits &= ~pointerIdBits; 1865 if (target.pointerIdBits == 0) { 1866 if (predecessor == null) { 1867 mFirstTouchTarget = next; 1868 } else { 1869 predecessor.next = next; 1870 } 1871 target.recycle(); 1872 target = next; 1873 continue; 1874 } 1875 } 1876 predecessor = target; 1877 target = next; 1878 } 1879 } 1880 1881 /** 1882 * Returns true if a child view can receive pointer events. 1883 * @hide 1884 */ 1885 private static boolean canViewReceivePointerEvents(View child) { 1886 return (child.mViewFlags & VISIBILITY_MASK) == VISIBLE 1887 || child.getAnimation() != null; 1888 } 1889 1890 /** 1891 * Returns true if a child view contains the specified point when transformed 1892 * into its coordinate space. 1893 * Child must not be null. 1894 * @hide 1895 */ 1896 protected boolean isTransformedTouchPointInView(float x, float y, View child, 1897 PointF outLocalPoint) { 1898 float localX = x + mScrollX - child.mLeft; 1899 float localY = y + mScrollY - child.mTop; 1900 if (! child.hasIdentityMatrix() && mAttachInfo != null) { 1901 final float[] localXY = mAttachInfo.mTmpTransformLocation; 1902 localXY[0] = localX; 1903 localXY[1] = localY; 1904 child.getInverseMatrix().mapPoints(localXY); 1905 localX = localXY[0]; 1906 localY = localXY[1]; 1907 } 1908 final boolean isInView = child.pointInView(localX, localY); 1909 if (isInView && outLocalPoint != null) { 1910 outLocalPoint.set(localX, localY); 1911 } 1912 return isInView; 1913 } 1914 1915 /** 1916 * Transforms a motion event into the coordinate space of a particular child view, 1917 * filters out irrelevant pointer ids, and overrides its action if necessary. 1918 * If child is null, assumes the MotionEvent will be sent to this ViewGroup instead. 1919 */ 1920 private boolean dispatchTransformedTouchEvent(MotionEvent event, boolean cancel, 1921 View child, int desiredPointerIdBits) { 1922 final boolean handled; 1923 1924 // Canceling motions is a special case. We don't need to perform any transformations 1925 // or filtering. The important part is the action, not the contents. 1926 final int oldAction = event.getAction(); 1927 if (cancel || oldAction == MotionEvent.ACTION_CANCEL) { 1928 event.setAction(MotionEvent.ACTION_CANCEL); 1929 if (child == null) { 1930 handled = super.dispatchTouchEvent(event); 1931 } else { 1932 handled = child.dispatchTouchEvent(event); 1933 } 1934 event.setAction(oldAction); 1935 return handled; 1936 } 1937 1938 // Calculate the number of pointers to deliver. 1939 final int oldPointerIdBits = event.getPointerIdBits(); 1940 final int newPointerIdBits = oldPointerIdBits & desiredPointerIdBits; 1941 1942 // If for some reason we ended up in an inconsistent state where it looks like we 1943 // might produce a motion event with no pointers in it, then drop the event. 1944 if (newPointerIdBits == 0) { 1945 return false; 1946 } 1947 1948 // If the number of pointers is the same and we don't need to perform any fancy 1949 // irreversible transformations, then we can reuse the motion event for this 1950 // dispatch as long as we are careful to revert any changes we make. 1951 // Otherwise we need to make a copy. 1952 final MotionEvent transformedEvent; 1953 if (newPointerIdBits == oldPointerIdBits) { 1954 if (child == null || child.hasIdentityMatrix()) { 1955 if (child == null) { 1956 handled = super.dispatchTouchEvent(event); 1957 } else { 1958 final float offsetX = mScrollX - child.mLeft; 1959 final float offsetY = mScrollY - child.mTop; 1960 event.offsetLocation(offsetX, offsetY); 1961 1962 handled = child.dispatchTouchEvent(event); 1963 1964 event.offsetLocation(-offsetX, -offsetY); 1965 } 1966 return handled; 1967 } 1968 transformedEvent = MotionEvent.obtain(event); 1969 } else { 1970 transformedEvent = event.split(newPointerIdBits); 1971 } 1972 1973 // Perform any necessary transformations and dispatch. 1974 if (child == null) { 1975 handled = super.dispatchTouchEvent(transformedEvent); 1976 } else { 1977 final float offsetX = mScrollX - child.mLeft; 1978 final float offsetY = mScrollY - child.mTop; 1979 transformedEvent.offsetLocation(offsetX, offsetY); 1980 if (! child.hasIdentityMatrix()) { 1981 transformedEvent.transform(child.getInverseMatrix()); 1982 } 1983 1984 handled = child.dispatchTouchEvent(transformedEvent); 1985 } 1986 1987 // Done. 1988 transformedEvent.recycle(); 1989 return handled; 1990 } 1991 1992 /** 1993 * Enable or disable the splitting of MotionEvents to multiple children during touch event 1994 * dispatch. This behavior is enabled by default for applications that target an 1995 * SDK version of {@link Build.VERSION_CODES#HONEYCOMB} or newer. 1996 * 1997 * <p>When this option is enabled MotionEvents may be split and dispatched to different child 1998 * views depending on where each pointer initially went down. This allows for user interactions 1999 * such as scrolling two panes of content independently, chording of buttons, and performing 2000 * independent gestures on different pieces of content. 2001 * 2002 * @param split <code>true</code> to allow MotionEvents to be split and dispatched to multiple 2003 * child views. <code>false</code> to only allow one child view to be the target of 2004 * any MotionEvent received by this ViewGroup. 2005 */ 2006 public void setMotionEventSplittingEnabled(boolean split) { 2007 // TODO Applications really shouldn't change this setting mid-touch event, 2008 // but perhaps this should handle that case and send ACTION_CANCELs to any child views 2009 // with gestures in progress when this is changed. 2010 if (split) { 2011 mGroupFlags |= FLAG_SPLIT_MOTION_EVENTS; 2012 } else { 2013 mGroupFlags &= ~FLAG_SPLIT_MOTION_EVENTS; 2014 } 2015 } 2016 2017 /** 2018 * Returns true if MotionEvents dispatched to this ViewGroup can be split to multiple children. 2019 * @return true if MotionEvents dispatched to this ViewGroup can be split to multiple children. 2020 */ 2021 public boolean isMotionEventSplittingEnabled() { 2022 return (mGroupFlags & FLAG_SPLIT_MOTION_EVENTS) == FLAG_SPLIT_MOTION_EVENTS; 2023 } 2024 2025 /** 2026 * {@inheritDoc} 2027 */ 2028 public void requestDisallowInterceptTouchEvent(boolean disallowIntercept) { 2029 2030 if (disallowIntercept == ((mGroupFlags & FLAG_DISALLOW_INTERCEPT) != 0)) { 2031 // We're already in this state, assume our ancestors are too 2032 return; 2033 } 2034 2035 if (disallowIntercept) { 2036 mGroupFlags |= FLAG_DISALLOW_INTERCEPT; 2037 } else { 2038 mGroupFlags &= ~FLAG_DISALLOW_INTERCEPT; 2039 } 2040 2041 // Pass it up to our parent 2042 if (mParent != null) { 2043 mParent.requestDisallowInterceptTouchEvent(disallowIntercept); 2044 } 2045 } 2046 2047 /** 2048 * Implement this method to intercept all touch screen motion events. This 2049 * allows you to watch events as they are dispatched to your children, and 2050 * take ownership of the current gesture at any point. 2051 * 2052 * <p>Using this function takes some care, as it has a fairly complicated 2053 * interaction with {@link View#onTouchEvent(MotionEvent) 2054 * View.onTouchEvent(MotionEvent)}, and using it requires implementing 2055 * that method as well as this one in the correct way. Events will be 2056 * received in the following order: 2057 * 2058 * <ol> 2059 * <li> You will receive the down event here. 2060 * <li> The down event will be handled either by a child of this view 2061 * group, or given to your own onTouchEvent() method to handle; this means 2062 * you should implement onTouchEvent() to return true, so you will 2063 * continue to see the rest of the gesture (instead of looking for 2064 * a parent view to handle it). Also, by returning true from 2065 * onTouchEvent(), you will not receive any following 2066 * events in onInterceptTouchEvent() and all touch processing must 2067 * happen in onTouchEvent() like normal. 2068 * <li> For as long as you return false from this function, each following 2069 * event (up to and including the final up) will be delivered first here 2070 * and then to the target's onTouchEvent(). 2071 * <li> If you return true from here, you will not receive any 2072 * following events: the target view will receive the same event but 2073 * with the action {@link MotionEvent#ACTION_CANCEL}, and all further 2074 * events will be delivered to your onTouchEvent() method and no longer 2075 * appear here. 2076 * </ol> 2077 * 2078 * @param ev The motion event being dispatched down the hierarchy. 2079 * @return Return true to steal motion events from the children and have 2080 * them dispatched to this ViewGroup through onTouchEvent(). 2081 * The current target will receive an ACTION_CANCEL event, and no further 2082 * messages will be delivered here. 2083 */ 2084 public boolean onInterceptTouchEvent(MotionEvent ev) { 2085 return false; 2086 } 2087 2088 /** 2089 * {@inheritDoc} 2090 * 2091 * Looks for a view to give focus to respecting the setting specified by 2092 * {@link #getDescendantFocusability()}. 2093 * 2094 * Uses {@link #onRequestFocusInDescendants(int, android.graphics.Rect)} to 2095 * find focus within the children of this group when appropriate. 2096 * 2097 * @see #FOCUS_BEFORE_DESCENDANTS 2098 * @see #FOCUS_AFTER_DESCENDANTS 2099 * @see #FOCUS_BLOCK_DESCENDANTS 2100 * @see #onRequestFocusInDescendants(int, android.graphics.Rect) 2101 */ 2102 @Override 2103 public boolean requestFocus(int direction, Rect previouslyFocusedRect) { 2104 if (DBG) { 2105 System.out.println(this + " ViewGroup.requestFocus direction=" 2106 + direction); 2107 } 2108 int descendantFocusability = getDescendantFocusability(); 2109 2110 switch (descendantFocusability) { 2111 case FOCUS_BLOCK_DESCENDANTS: 2112 return super.requestFocus(direction, previouslyFocusedRect); 2113 case FOCUS_BEFORE_DESCENDANTS: { 2114 final boolean took = super.requestFocus(direction, previouslyFocusedRect); 2115 return took ? took : onRequestFocusInDescendants(direction, previouslyFocusedRect); 2116 } 2117 case FOCUS_AFTER_DESCENDANTS: { 2118 final boolean took = onRequestFocusInDescendants(direction, previouslyFocusedRect); 2119 return took ? took : super.requestFocus(direction, previouslyFocusedRect); 2120 } 2121 default: 2122 throw new IllegalStateException("descendant focusability must be " 2123 + "one of FOCUS_BEFORE_DESCENDANTS, FOCUS_AFTER_DESCENDANTS, FOCUS_BLOCK_DESCENDANTS " 2124 + "but is " + descendantFocusability); 2125 } 2126 } 2127 2128 /** 2129 * Look for a descendant to call {@link View#requestFocus} on. 2130 * Called by {@link ViewGroup#requestFocus(int, android.graphics.Rect)} 2131 * when it wants to request focus within its children. Override this to 2132 * customize how your {@link ViewGroup} requests focus within its children. 2133 * @param direction One of FOCUS_UP, FOCUS_DOWN, FOCUS_LEFT, and FOCUS_RIGHT 2134 * @param previouslyFocusedRect The rectangle (in this View's coordinate system) 2135 * to give a finer grained hint about where focus is coming from. May be null 2136 * if there is no hint. 2137 * @return Whether focus was taken. 2138 */ 2139 @SuppressWarnings({"ConstantConditions"}) 2140 protected boolean onRequestFocusInDescendants(int direction, 2141 Rect previouslyFocusedRect) { 2142 int index; 2143 int increment; 2144 int end; 2145 int count = mChildrenCount; 2146 if ((direction & FOCUS_FORWARD) != 0) { 2147 index = 0; 2148 increment = 1; 2149 end = count; 2150 } else { 2151 index = count - 1; 2152 increment = -1; 2153 end = -1; 2154 } 2155 final View[] children = mChildren; 2156 for (int i = index; i != end; i += increment) { 2157 View child = children[i]; 2158 if ((child.mViewFlags & VISIBILITY_MASK) == VISIBLE) { 2159 if (child.requestFocus(direction, previouslyFocusedRect)) { 2160 return true; 2161 } 2162 } 2163 } 2164 return false; 2165 } 2166 2167 /** 2168 * {@inheritDoc} 2169 * 2170 * @hide 2171 */ 2172 @Override 2173 public void dispatchStartTemporaryDetach() { 2174 super.dispatchStartTemporaryDetach(); 2175 final int count = mChildrenCount; 2176 final View[] children = mChildren; 2177 for (int i = 0; i < count; i++) { 2178 children[i].dispatchStartTemporaryDetach(); 2179 } 2180 } 2181 2182 /** 2183 * {@inheritDoc} 2184 * 2185 * @hide 2186 */ 2187 @Override 2188 public void dispatchFinishTemporaryDetach() { 2189 super.dispatchFinishTemporaryDetach(); 2190 final int count = mChildrenCount; 2191 final View[] children = mChildren; 2192 for (int i = 0; i < count; i++) { 2193 children[i].dispatchFinishTemporaryDetach(); 2194 } 2195 } 2196 2197 /** 2198 * {@inheritDoc} 2199 */ 2200 @Override 2201 void dispatchAttachedToWindow(AttachInfo info, int visibility) { 2202 mGroupFlags |= FLAG_PREVENT_DISPATCH_ATTACHED_TO_WINDOW; 2203 super.dispatchAttachedToWindow(info, visibility); 2204 mGroupFlags &= ~FLAG_PREVENT_DISPATCH_ATTACHED_TO_WINDOW; 2205 2206 visibility |= mViewFlags & VISIBILITY_MASK; 2207 2208 final int count = mChildrenCount; 2209 final View[] children = mChildren; 2210 for (int i = 0; i < count; i++) { 2211 children[i].dispatchAttachedToWindow(info, visibility); 2212 } 2213 } 2214 2215 @Override 2216 boolean dispatchPopulateAccessibilityEventInternal(AccessibilityEvent event) { 2217 boolean handled = super.dispatchPopulateAccessibilityEventInternal(event); 2218 if (handled) { 2219 return handled; 2220 } 2221 // Let our children have a shot in populating the event. 2222 for (int i = 0, count = getChildCount(); i < count; i++) { 2223 View child = getChildAt(i); 2224 if ((child.mViewFlags & VISIBILITY_MASK) == VISIBLE) { 2225 handled = getChildAt(i).dispatchPopulateAccessibilityEvent(event); 2226 if (handled) { 2227 return handled; 2228 } 2229 } 2230 } 2231 return false; 2232 } 2233 2234 @Override 2235 void onInitializeAccessibilityNodeInfoInternal(AccessibilityNodeInfo info) { 2236 super.onInitializeAccessibilityNodeInfoInternal(info); 2237 info.setClassName(ViewGroup.class.getName()); 2238 for (int i = 0, count = mChildrenCount; i < count; i++) { 2239 View child = mChildren[i]; 2240 if ((child.mViewFlags & VISIBILITY_MASK) == VISIBLE 2241 && (child.mPrivateFlags & IS_ROOT_NAMESPACE) == 0) { 2242 info.addChild(child); 2243 } 2244 } 2245 } 2246 2247 @Override 2248 void onInitializeAccessibilityEventInternal(AccessibilityEvent event) { 2249 super.onInitializeAccessibilityEventInternal(event); 2250 event.setClassName(ViewGroup.class.getName()); 2251 } 2252 2253 /** 2254 * {@inheritDoc} 2255 */ 2256 @Override 2257 void dispatchDetachedFromWindow() { 2258 // If we still have a touch target, we are still in the process of 2259 // dispatching motion events to a child; we need to get rid of that 2260 // child to avoid dispatching events to it after the window is torn 2261 // down. To make sure we keep the child in a consistent state, we 2262 // first send it an ACTION_CANCEL motion event. 2263 cancelAndClearTouchTargets(null); 2264 2265 // In case view is detached while transition is running 2266 mLayoutSuppressed = false; 2267 2268 // Tear down our drag tracking 2269 mDragNotifiedChildren = null; 2270 if (mCurrentDrag != null) { 2271 mCurrentDrag.recycle(); 2272 mCurrentDrag = null; 2273 } 2274 2275 final int count = mChildrenCount; 2276 final View[] children = mChildren; 2277 for (int i = 0; i < count; i++) { 2278 children[i].dispatchDetachedFromWindow(); 2279 } 2280 super.dispatchDetachedFromWindow(); 2281 } 2282 2283 /** 2284 * {@inheritDoc} 2285 */ 2286 @Override 2287 public void setPadding(int left, int top, int right, int bottom) { 2288 super.setPadding(left, top, right, bottom); 2289 2290 if ((mPaddingLeft | mPaddingTop | mPaddingRight | mPaddingBottom) != 0) { 2291 mGroupFlags |= FLAG_PADDING_NOT_NULL; 2292 } else { 2293 mGroupFlags &= ~FLAG_PADDING_NOT_NULL; 2294 } 2295 } 2296 2297 /** 2298 * {@inheritDoc} 2299 */ 2300 @Override 2301 protected void dispatchSaveInstanceState(SparseArray<Parcelable> container) { 2302 super.dispatchSaveInstanceState(container); 2303 final int count = mChildrenCount; 2304 final View[] children = mChildren; 2305 for (int i = 0; i < count; i++) { 2306 View c = children[i]; 2307 if ((c.mViewFlags & PARENT_SAVE_DISABLED_MASK) != PARENT_SAVE_DISABLED) { 2308 c.dispatchSaveInstanceState(container); 2309 } 2310 } 2311 } 2312 2313 /** 2314 * Perform dispatching of a {@link #saveHierarchyState(android.util.SparseArray)} freeze()} 2315 * to only this view, not to its children. For use when overriding 2316 * {@link #dispatchSaveInstanceState(android.util.SparseArray)} dispatchFreeze()} to allow 2317 * subclasses to freeze their own state but not the state of their children. 2318 * 2319 * @param container the container 2320 */ 2321 protected void dispatchFreezeSelfOnly(SparseArray<Parcelable> container) { 2322 super.dispatchSaveInstanceState(container); 2323 } 2324 2325 /** 2326 * {@inheritDoc} 2327 */ 2328 @Override 2329 protected void dispatchRestoreInstanceState(SparseArray<Parcelable> container) { 2330 super.dispatchRestoreInstanceState(container); 2331 final int count = mChildrenCount; 2332 final View[] children = mChildren; 2333 for (int i = 0; i < count; i++) { 2334 View c = children[i]; 2335 if ((c.mViewFlags & PARENT_SAVE_DISABLED_MASK) != PARENT_SAVE_DISABLED) { 2336 c.dispatchRestoreInstanceState(container); 2337 } 2338 } 2339 } 2340 2341 /** 2342 * Perform dispatching of a {@link #restoreHierarchyState(android.util.SparseArray)} 2343 * to only this view, not to its children. For use when overriding 2344 * {@link #dispatchRestoreInstanceState(android.util.SparseArray)} to allow 2345 * subclasses to thaw their own state but not the state of their children. 2346 * 2347 * @param container the container 2348 */ 2349 protected void dispatchThawSelfOnly(SparseArray<Parcelable> container) { 2350 super.dispatchRestoreInstanceState(container); 2351 } 2352 2353 /** 2354 * Enables or disables the drawing cache for each child of this view group. 2355 * 2356 * @param enabled true to enable the cache, false to dispose of it 2357 */ 2358 protected void setChildrenDrawingCacheEnabled(boolean enabled) { 2359 if (enabled || (mPersistentDrawingCache & PERSISTENT_ALL_CACHES) != PERSISTENT_ALL_CACHES) { 2360 final View[] children = mChildren; 2361 final int count = mChildrenCount; 2362 for (int i = 0; i < count; i++) { 2363 children[i].setDrawingCacheEnabled(enabled); 2364 } 2365 } 2366 } 2367 2368 @Override 2369 protected void onAnimationStart() { 2370 super.onAnimationStart(); 2371 2372 // When this ViewGroup's animation starts, build the cache for the children 2373 if ((mGroupFlags & FLAG_ANIMATION_CACHE) == FLAG_ANIMATION_CACHE) { 2374 final int count = mChildrenCount; 2375 final View[] children = mChildren; 2376 final boolean buildCache = !isHardwareAccelerated(); 2377 2378 for (int i = 0; i < count; i++) { 2379 final View child = children[i]; 2380 if ((child.mViewFlags & VISIBILITY_MASK) == VISIBLE) { 2381 child.setDrawingCacheEnabled(true); 2382 if (buildCache) { 2383 child.buildDrawingCache(true); 2384 } 2385 } 2386 } 2387 2388 mGroupFlags |= FLAG_CHILDREN_DRAWN_WITH_CACHE; 2389 } 2390 } 2391 2392 @Override 2393 protected void onAnimationEnd() { 2394 super.onAnimationEnd(); 2395 2396 // When this ViewGroup's animation ends, destroy the cache of the children 2397 if ((mGroupFlags & FLAG_ANIMATION_CACHE) == FLAG_ANIMATION_CACHE) { 2398 mGroupFlags &= ~FLAG_CHILDREN_DRAWN_WITH_CACHE; 2399 2400 if ((mPersistentDrawingCache & PERSISTENT_ANIMATION_CACHE) == 0) { 2401 setChildrenDrawingCacheEnabled(false); 2402 } 2403 } 2404 } 2405 2406 @Override 2407 Bitmap createSnapshot(Bitmap.Config quality, int backgroundColor, boolean skipChildren) { 2408 int count = mChildrenCount; 2409 int[] visibilities = null; 2410 2411 if (skipChildren) { 2412 visibilities = new int[count]; 2413 for (int i = 0; i < count; i++) { 2414 View child = getChildAt(i); 2415 visibilities[i] = child.getVisibility(); 2416 if (visibilities[i] == View.VISIBLE) { 2417 child.setVisibility(INVISIBLE); 2418 } 2419 } 2420 } 2421 2422 Bitmap b = super.createSnapshot(quality, backgroundColor, skipChildren); 2423 2424 if (skipChildren) { 2425 for (int i = 0; i < count; i++) { 2426 getChildAt(i).setVisibility(visibilities[i]); 2427 } 2428 } 2429 2430 return b; 2431 } 2432 2433 /** 2434 * {@inheritDoc} 2435 */ 2436 @Override 2437 protected void dispatchDraw(Canvas canvas) { 2438 final int count = mChildrenCount; 2439 final View[] children = mChildren; 2440 int flags = mGroupFlags; 2441 2442 if ((flags & FLAG_RUN_ANIMATION) != 0 && canAnimate()) { 2443 final boolean cache = (mGroupFlags & FLAG_ANIMATION_CACHE) == FLAG_ANIMATION_CACHE; 2444 2445 final boolean buildCache = !isHardwareAccelerated(); 2446 for (int i = 0; i < count; i++) { 2447 final View child = children[i]; 2448 if ((child.mViewFlags & VISIBILITY_MASK) == VISIBLE) { 2449 final LayoutParams params = child.getLayoutParams(); 2450 attachLayoutAnimationParameters(child, params, i, count); 2451 bindLayoutAnimation(child); 2452 if (cache) { 2453 child.setDrawingCacheEnabled(true); 2454 if (buildCache) { 2455 child.buildDrawingCache(true); 2456 } 2457 } 2458 } 2459 } 2460 2461 final LayoutAnimationController controller = mLayoutAnimationController; 2462 if (controller.willOverlap()) { 2463 mGroupFlags |= FLAG_OPTIMIZE_INVALIDATE; 2464 } 2465 2466 controller.start(); 2467 2468 mGroupFlags &= ~FLAG_RUN_ANIMATION; 2469 mGroupFlags &= ~FLAG_ANIMATION_DONE; 2470 2471 if (cache) { 2472 mGroupFlags |= FLAG_CHILDREN_DRAWN_WITH_CACHE; 2473 } 2474 2475 if (mAnimationListener != null) { 2476 mAnimationListener.onAnimationStart(controller.getAnimation()); 2477 } 2478 } 2479 2480 int saveCount = 0; 2481 final boolean clipToPadding = (flags & CLIP_TO_PADDING_MASK) == CLIP_TO_PADDING_MASK; 2482 if (clipToPadding) { 2483 saveCount = canvas.save(); 2484 canvas.clipRect(mScrollX + mPaddingLeft, mScrollY + mPaddingTop, 2485 mScrollX + mRight - mLeft - mPaddingRight, 2486 mScrollY + mBottom - mTop - mPaddingBottom); 2487 2488 } 2489 2490 // We will draw our child's animation, let's reset the flag 2491 mPrivateFlags &= ~DRAW_ANIMATION; 2492 mGroupFlags &= ~FLAG_INVALIDATE_REQUIRED; 2493 2494 boolean more = false; 2495 final long drawingTime = getDrawingTime(); 2496 2497 if ((flags & FLAG_USE_CHILD_DRAWING_ORDER) == 0) { 2498 for (int i = 0; i < count; i++) { 2499 final View child = children[i]; 2500 if ((child.mViewFlags & VISIBILITY_MASK) == VISIBLE || child.getAnimation() != null) { 2501 more |= drawChild(canvas, child, drawingTime); 2502 } 2503 } 2504 } else { 2505 for (int i = 0; i < count; i++) { 2506 final View child = children[getChildDrawingOrder(count, i)]; 2507 if ((child.mViewFlags & VISIBILITY_MASK) == VISIBLE || child.getAnimation() != null) { 2508 more |= drawChild(canvas, child, drawingTime); 2509 } 2510 } 2511 } 2512 2513 // Draw any disappearing views that have animations 2514 if (mDisappearingChildren != null) { 2515 final ArrayList<View> disappearingChildren = mDisappearingChildren; 2516 final int disappearingCount = disappearingChildren.size() - 1; 2517 // Go backwards -- we may delete as animations finish 2518 for (int i = disappearingCount; i >= 0; i--) { 2519 final View child = disappearingChildren.get(i); 2520 more |= drawChild(canvas, child, drawingTime); 2521 } 2522 } 2523 2524 if (clipToPadding) { 2525 canvas.restoreToCount(saveCount); 2526 } 2527 2528 // mGroupFlags might have been updated by drawChild() 2529 flags = mGroupFlags; 2530 2531 if ((flags & FLAG_INVALIDATE_REQUIRED) == FLAG_INVALIDATE_REQUIRED) { 2532 invalidate(true); 2533 } 2534 2535 if ((flags & FLAG_ANIMATION_DONE) == 0 && (flags & FLAG_NOTIFY_ANIMATION_LISTENER) == 0 && 2536 mLayoutAnimationController.isDone() && !more) { 2537 // We want to erase the drawing cache and notify the listener after the 2538 // next frame is drawn because one extra invalidate() is caused by 2539 // drawChild() after the animation is over 2540 mGroupFlags |= FLAG_NOTIFY_ANIMATION_LISTENER; 2541 final Runnable end = new Runnable() { 2542 public void run() { 2543 notifyAnimationListener(); 2544 } 2545 }; 2546 post(end); 2547 } 2548 } 2549 2550 /** 2551 * Returns the index of the child to draw for this iteration. Override this 2552 * if you want to change the drawing order of children. By default, it 2553 * returns i. 2554 * <p> 2555 * NOTE: In order for this method to be called, you must enable child ordering 2556 * first by calling {@link #setChildrenDrawingOrderEnabled(boolean)}. 2557 * 2558 * @param i The current iteration. 2559 * @return The index of the child to draw this iteration. 2560 * 2561 * @see #setChildrenDrawingOrderEnabled(boolean) 2562 * @see #isChildrenDrawingOrderEnabled() 2563 */ 2564 protected int getChildDrawingOrder(int childCount, int i) { 2565 return i; 2566 } 2567 2568 private void notifyAnimationListener() { 2569 mGroupFlags &= ~FLAG_NOTIFY_ANIMATION_LISTENER; 2570 mGroupFlags |= FLAG_ANIMATION_DONE; 2571 2572 if (mAnimationListener != null) { 2573 final Runnable end = new Runnable() { 2574 public void run() { 2575 mAnimationListener.onAnimationEnd(mLayoutAnimationController.getAnimation()); 2576 } 2577 }; 2578 post(end); 2579 } 2580 2581 if ((mGroupFlags & FLAG_ANIMATION_CACHE) == FLAG_ANIMATION_CACHE) { 2582 mGroupFlags &= ~FLAG_CHILDREN_DRAWN_WITH_CACHE; 2583 if ((mPersistentDrawingCache & PERSISTENT_ANIMATION_CACHE) == 0) { 2584 setChildrenDrawingCacheEnabled(false); 2585 } 2586 } 2587 2588 invalidate(true); 2589 } 2590 2591 /** 2592 * This method is used to cause children of this ViewGroup to restore or recreate their 2593 * display lists. It is called by getDisplayList() when the parent ViewGroup does not need 2594 * to recreate its own display list, which would happen if it went through the normal 2595 * draw/dispatchDraw mechanisms. 2596 * 2597 * @hide 2598 */ 2599 @Override 2600 protected void dispatchGetDisplayList() { 2601 final int count = mChildrenCount; 2602 final View[] children = mChildren; 2603 for (int i = 0; i < count; i++) { 2604 final View child = children[i]; 2605 if (((child.mViewFlags & VISIBILITY_MASK) == VISIBLE || child.getAnimation() != null) && 2606 child.hasStaticLayer()) { 2607 child.mRecreateDisplayList = (child.mPrivateFlags & INVALIDATED) == INVALIDATED; 2608 child.mPrivateFlags &= ~INVALIDATED; 2609 child.getDisplayList(); 2610 child.mRecreateDisplayList = false; 2611 } 2612 } 2613 } 2614 2615 /** 2616 * Draw one child of this View Group. This method is responsible for getting 2617 * the canvas in the right state. This includes clipping, translating so 2618 * that the child's scrolled origin is at 0, 0, and applying any animation 2619 * transformations. 2620 * 2621 * @param canvas The canvas on which to draw the child 2622 * @param child Who to draw 2623 * @param drawingTime The time at which draw is occuring 2624 * @return True if an invalidate() was issued 2625 */ 2626 protected boolean drawChild(Canvas canvas, View child, long drawingTime) { 2627 return child.draw(canvas, this, drawingTime); 2628 } 2629 2630 /** 2631 * 2632 * @param enabled True if children should be drawn with layers, false otherwise. 2633 * 2634 * @hide 2635 */ 2636 public void setChildrenLayersEnabled(boolean enabled) { 2637 if (enabled != mDrawLayers) { 2638 mDrawLayers = enabled; 2639 invalidate(true); 2640 2641 boolean flushLayers = !enabled; 2642 AttachInfo info = mAttachInfo; 2643 if (info != null && info.mHardwareRenderer != null && 2644 info.mHardwareRenderer.isEnabled()) { 2645 if (!info.mHardwareRenderer.validate()) { 2646 flushLayers = false; 2647 } 2648 } else { 2649 flushLayers = false; 2650 } 2651 2652 // We need to invalidate any child with a layer. For instance, 2653 // if a child is backed by a hardware layer and we disable layers 2654 // the child is marked as not dirty (flags cleared the last time 2655 // the child was drawn inside its layer.) However, that child might 2656 // never have created its own display list or have an obsolete 2657 // display list. By invalidating the child we ensure the display 2658 // list is in sync with the content of the hardware layer. 2659 for (int i = 0; i < mChildrenCount; i++) { 2660 View child = mChildren[i]; 2661 if (child.mLayerType != LAYER_TYPE_NONE) { 2662 if (flushLayers) child.flushLayer(); 2663 child.invalidate(true); 2664 } 2665 } 2666 } 2667 } 2668 2669 /** 2670 * By default, children are clipped to their bounds before drawing. This 2671 * allows view groups to override this behavior for animations, etc. 2672 * 2673 * @param clipChildren true to clip children to their bounds, 2674 * false otherwise 2675 * @attr ref android.R.styleable#ViewGroup_clipChildren 2676 */ 2677 public void setClipChildren(boolean clipChildren) { 2678 setBooleanFlag(FLAG_CLIP_CHILDREN, clipChildren); 2679 } 2680 2681 /** 2682 * By default, children are clipped to the padding of the ViewGroup. This 2683 * allows view groups to override this behavior 2684 * 2685 * @param clipToPadding true to clip children to the padding of the 2686 * group, false otherwise 2687 * @attr ref android.R.styleable#ViewGroup_clipToPadding 2688 */ 2689 public void setClipToPadding(boolean clipToPadding) { 2690 setBooleanFlag(FLAG_CLIP_TO_PADDING, clipToPadding); 2691 } 2692 2693 /** 2694 * {@inheritDoc} 2695 */ 2696 @Override 2697 public void dispatchSetSelected(boolean selected) { 2698 final View[] children = mChildren; 2699 final int count = mChildrenCount; 2700 for (int i = 0; i < count; i++) { 2701 children[i].setSelected(selected); 2702 } 2703 } 2704 2705 /** 2706 * {@inheritDoc} 2707 */ 2708 @Override 2709 public void dispatchSetActivated(boolean activated) { 2710 final View[] children = mChildren; 2711 final int count = mChildrenCount; 2712 for (int i = 0; i < count; i++) { 2713 children[i].setActivated(activated); 2714 } 2715 } 2716 2717 @Override 2718 protected void dispatchSetPressed(boolean pressed) { 2719 final View[] children = mChildren; 2720 final int count = mChildrenCount; 2721 for (int i = 0; i < count; i++) { 2722 children[i].setPressed(pressed); 2723 } 2724 } 2725 2726 /** 2727 * When this property is set to true, this ViewGroup supports static transformations on 2728 * children; this causes 2729 * {@link #getChildStaticTransformation(View, android.view.animation.Transformation)} to be 2730 * invoked when a child is drawn. 2731 * 2732 * Any subclass overriding 2733 * {@link #getChildStaticTransformation(View, android.view.animation.Transformation)} should 2734 * set this property to true. 2735 * 2736 * @param enabled True to enable static transformations on children, false otherwise. 2737 * 2738 * @see #FLAG_SUPPORT_STATIC_TRANSFORMATIONS 2739 */ 2740 protected void setStaticTransformationsEnabled(boolean enabled) { 2741 setBooleanFlag(FLAG_SUPPORT_STATIC_TRANSFORMATIONS, enabled); 2742 } 2743 2744 /** 2745 * Sets <code>t</code> to be the static transformation of the child, if set, returning a 2746 * boolean to indicate whether a static transform was set. The default implementation 2747 * simply returns <code>false</code>; subclasses may override this method for different 2748 * behavior. 2749 * 2750 * @param child The child view whose static transform is being requested 2751 * @param t The Transformation which will hold the result 2752 * @return true if the transformation was set, false otherwise 2753 * @see #setStaticTransformationsEnabled(boolean) 2754 */ 2755 protected boolean getChildStaticTransformation(View child, Transformation t) { 2756 return false; 2757 } 2758 2759 /** 2760 * {@hide} 2761 */ 2762 @Override 2763 protected View findViewTraversal(int id) { 2764 if (id == mID) { 2765 return this; 2766 } 2767 2768 final View[] where = mChildren; 2769 final int len = mChildrenCount; 2770 2771 for (int i = 0; i < len; i++) { 2772 View v = where[i]; 2773 2774 if ((v.mPrivateFlags & IS_ROOT_NAMESPACE) == 0) { 2775 v = v.findViewById(id); 2776 2777 if (v != null) { 2778 return v; 2779 } 2780 } 2781 } 2782 2783 return null; 2784 } 2785 2786 /** 2787 * {@hide} 2788 */ 2789 @Override 2790 protected View findViewWithTagTraversal(Object tag) { 2791 if (tag != null && tag.equals(mTag)) { 2792 return this; 2793 } 2794 2795 final View[] where = mChildren; 2796 final int len = mChildrenCount; 2797 2798 for (int i = 0; i < len; i++) { 2799 View v = where[i]; 2800 2801 if ((v.mPrivateFlags & IS_ROOT_NAMESPACE) == 0) { 2802 v = v.findViewWithTag(tag); 2803 2804 if (v != null) { 2805 return v; 2806 } 2807 } 2808 } 2809 2810 return null; 2811 } 2812 2813 /** 2814 * {@hide} 2815 */ 2816 @Override 2817 protected View findViewByPredicateTraversal(Predicate<View> predicate, View childToSkip) { 2818 if (predicate.apply(this)) { 2819 return this; 2820 } 2821 2822 final View[] where = mChildren; 2823 final int len = mChildrenCount; 2824 2825 for (int i = 0; i < len; i++) { 2826 View v = where[i]; 2827 2828 if (v != childToSkip && (v.mPrivateFlags & IS_ROOT_NAMESPACE) == 0) { 2829 v = v.findViewByPredicate(predicate); 2830 2831 if (v != null) { 2832 return v; 2833 } 2834 } 2835 } 2836 2837 return null; 2838 } 2839 2840 /** 2841 * Adds a child view. If no layout parameters are already set on the child, the 2842 * default parameters for this ViewGroup are set on the child. 2843 * 2844 * @param child the child view to add 2845 * 2846 * @see #generateDefaultLayoutParams() 2847 */ 2848 public void addView(View child) { 2849 addView(child, -1); 2850 } 2851 2852 /** 2853 * Adds a child view. If no layout parameters are already set on the child, the 2854 * default parameters for this ViewGroup are set on the child. 2855 * 2856 * @param child the child view to add 2857 * @param index the position at which to add the child 2858 * 2859 * @see #generateDefaultLayoutParams() 2860 */ 2861 public void addView(View child, int index) { 2862 LayoutParams params = child.getLayoutParams(); 2863 if (params == null) { 2864 params = generateDefaultLayoutParams(); 2865 if (params == null) { 2866 throw new IllegalArgumentException("generateDefaultLayoutParams() cannot return null"); 2867 } 2868 } 2869 addView(child, index, params); 2870 } 2871 2872 /** 2873 * Adds a child view with this ViewGroup's default layout parameters and the 2874 * specified width and height. 2875 * 2876 * @param child the child view to add 2877 */ 2878 public void addView(View child, int width, int height) { 2879 final LayoutParams params = generateDefaultLayoutParams(); 2880 params.width = width; 2881 params.height = height; 2882 addView(child, -1, params); 2883 } 2884 2885 /** 2886 * Adds a child view with the specified layout parameters. 2887 * 2888 * @param child the child view to add 2889 * @param params the layout parameters to set on the child 2890 */ 2891 public void addView(View child, LayoutParams params) { 2892 addView(child, -1, params); 2893 } 2894 2895 /** 2896 * Adds a child view with the specified layout parameters. 2897 * 2898 * @param child the child view to add 2899 * @param index the position at which to add the child 2900 * @param params the layout parameters to set on the child 2901 */ 2902 public void addView(View child, int index, LayoutParams params) { 2903 if (DBG) { 2904 System.out.println(this + " addView"); 2905 } 2906 2907 // addViewInner() will call child.requestLayout() when setting the new LayoutParams 2908 // therefore, we call requestLayout() on ourselves before, so that the child's request 2909 // will be blocked at our level 2910 requestLayout(); 2911 invalidate(true); 2912 addViewInner(child, index, params, false); 2913 } 2914 2915 /** 2916 * {@inheritDoc} 2917 */ 2918 public void updateViewLayout(View view, ViewGroup.LayoutParams params) { 2919 if (!checkLayoutParams(params)) { 2920 throw new IllegalArgumentException("Invalid LayoutParams supplied to " + this); 2921 } 2922 if (view.mParent != this) { 2923 throw new IllegalArgumentException("Given view not a child of " + this); 2924 } 2925 view.setLayoutParams(params); 2926 } 2927 2928 /** 2929 * {@inheritDoc} 2930 */ 2931 protected boolean checkLayoutParams(ViewGroup.LayoutParams p) { 2932 return p != null; 2933 } 2934 2935 /** 2936 * Interface definition for a callback to be invoked when the hierarchy 2937 * within this view changed. The hierarchy changes whenever a child is added 2938 * to or removed from this view. 2939 */ 2940 public interface OnHierarchyChangeListener { 2941 /** 2942 * Called when a new child is added to a parent view. 2943 * 2944 * @param parent the view in which a child was added 2945 * @param child the new child view added in the hierarchy 2946 */ 2947 void onChildViewAdded(View parent, View child); 2948 2949 /** 2950 * Called when a child is removed from a parent view. 2951 * 2952 * @param parent the view from which the child was removed 2953 * @param child the child removed from the hierarchy 2954 */ 2955 void onChildViewRemoved(View parent, View child); 2956 } 2957 2958 /** 2959 * Register a callback to be invoked when a child is added to or removed 2960 * from this view. 2961 * 2962 * @param listener the callback to invoke on hierarchy change 2963 */ 2964 public void setOnHierarchyChangeListener(OnHierarchyChangeListener listener) { 2965 mOnHierarchyChangeListener = listener; 2966 } 2967 2968 /** 2969 * @hide 2970 */ 2971 protected void onViewAdded(View child) { 2972 if (mOnHierarchyChangeListener != null) { 2973 mOnHierarchyChangeListener.onChildViewAdded(this, child); 2974 } 2975 } 2976 2977 /** 2978 * @hide 2979 */ 2980 protected void onViewRemoved(View child) { 2981 if (mOnHierarchyChangeListener != null) { 2982 mOnHierarchyChangeListener.onChildViewRemoved(this, child); 2983 } 2984 } 2985 2986 /** 2987 * Adds a view during layout. This is useful if in your onLayout() method, 2988 * you need to add more views (as does the list view for example). 2989 * 2990 * If index is negative, it means put it at the end of the list. 2991 * 2992 * @param child the view to add to the group 2993 * @param index the index at which the child must be added 2994 * @param params the layout parameters to associate with the child 2995 * @return true if the child was added, false otherwise 2996 */ 2997 protected boolean addViewInLayout(View child, int index, LayoutParams params) { 2998 return addViewInLayout(child, index, params, false); 2999 } 3000 3001 /** 3002 * Adds a view during layout. This is useful if in your onLayout() method, 3003 * you need to add more views (as does the list view for example). 3004 * 3005 * If index is negative, it means put it at the end of the list. 3006 * 3007 * @param child the view to add to the group 3008 * @param index the index at which the child must be added 3009 * @param params the layout parameters to associate with the child 3010 * @param preventRequestLayout if true, calling this method will not trigger a 3011 * layout request on child 3012 * @return true if the child was added, false otherwise 3013 */ 3014 protected boolean addViewInLayout(View child, int index, LayoutParams params, 3015 boolean preventRequestLayout) { 3016 child.mParent = null; 3017 addViewInner(child, index, params, preventRequestLayout); 3018 child.mPrivateFlags = (child.mPrivateFlags & ~DIRTY_MASK) | DRAWN; 3019 return true; 3020 } 3021 3022 /** 3023 * Prevents the specified child to be laid out during the next layout pass. 3024 * 3025 * @param child the child on which to perform the cleanup 3026 */ 3027 protected void cleanupLayoutState(View child) { 3028 child.mPrivateFlags &= ~View.FORCE_LAYOUT; 3029 } 3030 3031 private void addViewInner(View child, int index, LayoutParams params, 3032 boolean preventRequestLayout) { 3033 3034 if (getAccessibilityNodeProvider() != null) { 3035 throw new IllegalStateException("Views with AccessibilityNodeProvider" 3036 + " can't have children."); 3037 } 3038 3039 if (mTransition != null) { 3040 // Don't prevent other add transitions from completing, but cancel remove 3041 // transitions to let them complete the process before we add to the container 3042 mTransition.cancel(LayoutTransition.DISAPPEARING); 3043 } 3044 3045 if (child.getParent() != null) { 3046 throw new IllegalStateException("The specified child already has a parent. " + 3047 "You must call removeView() on the child's parent first."); 3048 } 3049 3050 if (mTransition != null) { 3051 mTransition.addChild(this, child); 3052 } 3053 3054 if (!checkLayoutParams(params)) { 3055 params = generateLayoutParams(params); 3056 } 3057 3058 if (preventRequestLayout) { 3059 child.mLayoutParams = params; 3060 } else { 3061 child.setLayoutParams(params); 3062 } 3063 3064 if (index < 0) { 3065 index = mChildrenCount; 3066 } 3067 3068 addInArray(child, index); 3069 3070 // tell our children 3071 if (preventRequestLayout) { 3072 child.assignParent(this); 3073 } else { 3074 child.mParent = this; 3075 } 3076 3077 if (child.hasFocus()) { 3078 requestChildFocus(child, child.findFocus()); 3079 } 3080 3081 AttachInfo ai = mAttachInfo; 3082 if (ai != null && (mGroupFlags & FLAG_PREVENT_DISPATCH_ATTACHED_TO_WINDOW) == 0) { 3083 boolean lastKeepOn = ai.mKeepScreenOn; 3084 ai.mKeepScreenOn = false; 3085 child.dispatchAttachedToWindow(mAttachInfo, (mViewFlags&VISIBILITY_MASK)); 3086 if (ai.mKeepScreenOn) { 3087 needGlobalAttributesUpdate(true); 3088 } 3089 ai.mKeepScreenOn = lastKeepOn; 3090 } 3091 3092 onViewAdded(child); 3093 3094 if ((child.mViewFlags & DUPLICATE_PARENT_STATE) == DUPLICATE_PARENT_STATE) { 3095 mGroupFlags |= FLAG_NOTIFY_CHILDREN_ON_DRAWABLE_STATE_CHANGE; 3096 } 3097 } 3098 3099 private void addInArray(View child, int index) { 3100 View[] children = mChildren; 3101 final int count = mChildrenCount; 3102 final int size = children.length; 3103 if (index == count) { 3104 if (size == count) { 3105 mChildren = new View[size + ARRAY_CAPACITY_INCREMENT]; 3106 System.arraycopy(children, 0, mChildren, 0, size); 3107 children = mChildren; 3108 } 3109 children[mChildrenCount++] = child; 3110 } else if (index < count) { 3111 if (size == count) { 3112 mChildren = new View[size + ARRAY_CAPACITY_INCREMENT]; 3113 System.arraycopy(children, 0, mChildren, 0, index); 3114 System.arraycopy(children, index, mChildren, index + 1, count - index); 3115 children = mChildren; 3116 } else { 3117 System.arraycopy(children, index, children, index + 1, count - index); 3118 } 3119 children[index] = child; 3120 mChildrenCount++; 3121 if (mLastTouchDownIndex >= index) { 3122 mLastTouchDownIndex++; 3123 } 3124 } else { 3125 throw new IndexOutOfBoundsException("index=" + index + " count=" + count); 3126 } 3127 } 3128 3129 // This method also sets the child's mParent to null 3130 private void removeFromArray(int index) { 3131 final View[] children = mChildren; 3132 if (!(mTransitioningViews != null && mTransitioningViews.contains(children[index]))) { 3133 children[index].mParent = null; 3134 } 3135 final int count = mChildrenCount; 3136 if (index == count - 1) { 3137 children[--mChildrenCount] = null; 3138 } else if (index >= 0 && index < count) { 3139 System.arraycopy(children, index + 1, children, index, count - index - 1); 3140 children[--mChildrenCount] = null; 3141 } else { 3142 throw new IndexOutOfBoundsException(); 3143 } 3144 if (mLastTouchDownIndex == index) { 3145 mLastTouchDownTime = 0; 3146 mLastTouchDownIndex = -1; 3147 } else if (mLastTouchDownIndex > index) { 3148 mLastTouchDownIndex--; 3149 } 3150 } 3151 3152 // This method also sets the children's mParent to null 3153 private void removeFromArray(int start, int count) { 3154 final View[] children = mChildren; 3155 final int childrenCount = mChildrenCount; 3156 3157 start = Math.max(0, start); 3158 final int end = Math.min(childrenCount, start + count); 3159 3160 if (start == end) { 3161 return; 3162 } 3163 3164 if (end == childrenCount) { 3165 for (int i = start; i < end; i++) { 3166 children[i].mParent = null; 3167 children[i] = null; 3168 } 3169 } else { 3170 for (int i = start; i < end; i++) { 3171 children[i].mParent = null; 3172 } 3173 3174 // Since we're looping above, we might as well do the copy, but is arraycopy() 3175 // faster than the extra 2 bounds checks we would do in the loop? 3176 System.arraycopy(children, end, children, start, childrenCount - end); 3177 3178 for (int i = childrenCount - (end - start); i < childrenCount; i++) { 3179 children[i] = null; 3180 } 3181 } 3182 3183 mChildrenCount -= (end - start); 3184 } 3185 3186 private void bindLayoutAnimation(View child) { 3187 Animation a = mLayoutAnimationController.getAnimationForView(child); 3188 child.setAnimation(a); 3189 } 3190 3191 /** 3192 * Subclasses should override this method to set layout animation 3193 * parameters on the supplied child. 3194 * 3195 * @param child the child to associate with animation parameters 3196 * @param params the child's layout parameters which hold the animation 3197 * parameters 3198 * @param index the index of the child in the view group 3199 * @param count the number of children in the view group 3200 */ 3201 protected void attachLayoutAnimationParameters(View child, 3202 LayoutParams params, int index, int count) { 3203 LayoutAnimationController.AnimationParameters animationParams = 3204 params.layoutAnimationParameters; 3205 if (animationParams == null) { 3206 animationParams = new LayoutAnimationController.AnimationParameters(); 3207 params.layoutAnimationParameters = animationParams; 3208 } 3209 3210 animationParams.count = count; 3211 animationParams.index = index; 3212 } 3213 3214 /** 3215 * {@inheritDoc} 3216 */ 3217 public void removeView(View view) { 3218 removeViewInternal(view); 3219 requestLayout(); 3220 invalidate(true); 3221 } 3222 3223 /** 3224 * Removes a view during layout. This is useful if in your onLayout() method, 3225 * you need to remove more views. 3226 * 3227 * @param view the view to remove from the group 3228 */ 3229 public void removeViewInLayout(View view) { 3230 removeViewInternal(view); 3231 } 3232 3233 /** 3234 * Removes a range of views during layout. This is useful if in your onLayout() method, 3235 * you need to remove more views. 3236 * 3237 * @param start the index of the first view to remove from the group 3238 * @param count the number of views to remove from the group 3239 */ 3240 public void removeViewsInLayout(int start, int count) { 3241 removeViewsInternal(start, count); 3242 } 3243 3244 /** 3245 * Removes the view at the specified position in the group. 3246 * 3247 * @param index the position in the group of the view to remove 3248 */ 3249 public void removeViewAt(int index) { 3250 removeViewInternal(index, getChildAt(index)); 3251 requestLayout(); 3252 invalidate(true); 3253 } 3254 3255 /** 3256 * Removes the specified range of views from the group. 3257 * 3258 * @param start the first position in the group of the range of views to remove 3259 * @param count the number of views to remove 3260 */ 3261 public void removeViews(int start, int count) { 3262 removeViewsInternal(start, count); 3263 requestLayout(); 3264 invalidate(true); 3265 } 3266 3267 private void removeViewInternal(View view) { 3268 final int index = indexOfChild(view); 3269 if (index >= 0) { 3270 removeViewInternal(index, view); 3271 } 3272 } 3273 3274 private void removeViewInternal(int index, View view) { 3275 3276 if (mTransition != null) { 3277 mTransition.removeChild(this, view); 3278 } 3279 3280 boolean clearChildFocus = false; 3281 if (view == mFocused) { 3282 view.clearFocusForRemoval(); 3283 clearChildFocus = true; 3284 } 3285 3286 if (view.getAnimation() != null || 3287 (mTransitioningViews != null && mTransitioningViews.contains(view))) { 3288 addDisappearingView(view); 3289 } else if (view.mAttachInfo != null) { 3290 view.dispatchDetachedFromWindow(); 3291 } 3292 3293 onViewRemoved(view); 3294 3295 needGlobalAttributesUpdate(false); 3296 3297 removeFromArray(index); 3298 3299 if (clearChildFocus) { 3300 clearChildFocus(view); 3301 } 3302 } 3303 3304 /** 3305 * Sets the LayoutTransition object for this ViewGroup. If the LayoutTransition object is 3306 * not null, changes in layout which occur because of children being added to or removed from 3307 * the ViewGroup will be animated according to the animations defined in that LayoutTransition 3308 * object. By default, the transition object is null (so layout changes are not animated). 3309 * 3310 * @param transition The LayoutTransition object that will animated changes in layout. A value 3311 * of <code>null</code> means no transition will run on layout changes. 3312 * @attr ref android.R.styleable#ViewGroup_animateLayoutChanges 3313 */ 3314 public void setLayoutTransition(LayoutTransition transition) { 3315 if (mTransition != null) { 3316 mTransition.removeTransitionListener(mLayoutTransitionListener); 3317 } 3318 mTransition = transition; 3319 if (mTransition != null) { 3320 mTransition.addTransitionListener(mLayoutTransitionListener); 3321 } 3322 } 3323 3324 /** 3325 * Gets the LayoutTransition object for this ViewGroup. If the LayoutTransition object is 3326 * not null, changes in layout which occur because of children being added to or removed from 3327 * the ViewGroup will be animated according to the animations defined in that LayoutTransition 3328 * object. By default, the transition object is null (so layout changes are not animated). 3329 * 3330 * @return LayoutTranstion The LayoutTransition object that will animated changes in layout. 3331 * A value of <code>null</code> means no transition will run on layout changes. 3332 */ 3333 public LayoutTransition getLayoutTransition() { 3334 return mTransition; 3335 } 3336 3337 private void removeViewsInternal(int start, int count) { 3338 final View focused = mFocused; 3339 final boolean detach = mAttachInfo != null; 3340 View clearChildFocus = null; 3341 3342 final View[] children = mChildren; 3343 final int end = start + count; 3344 3345 for (int i = start; i < end; i++) { 3346 final View view = children[i]; 3347 3348 if (mTransition != null) { 3349 mTransition.removeChild(this, view); 3350 } 3351 3352 if (view == focused) { 3353 view.clearFocusForRemoval(); 3354 clearChildFocus = view; 3355 } 3356 3357 if (view.getAnimation() != null || 3358 (mTransitioningViews != null && mTransitioningViews.contains(view))) { 3359 addDisappearingView(view); 3360 } else if (detach) { 3361 view.dispatchDetachedFromWindow(); 3362 } 3363 3364 needGlobalAttributesUpdate(false); 3365 3366 onViewRemoved(view); 3367 } 3368 3369 removeFromArray(start, count); 3370 3371 if (clearChildFocus != null) { 3372 clearChildFocus(clearChildFocus); 3373 } 3374 } 3375 3376 /** 3377 * Call this method to remove all child views from the 3378 * ViewGroup. 3379 */ 3380 public void removeAllViews() { 3381 removeAllViewsInLayout(); 3382 requestLayout(); 3383 invalidate(true); 3384 } 3385 3386 /** 3387 * Called by a ViewGroup subclass to remove child views from itself, 3388 * when it must first know its size on screen before it can calculate how many 3389 * child views it will render. An example is a Gallery or a ListView, which 3390 * may "have" 50 children, but actually only render the number of children 3391 * that can currently fit inside the object on screen. Do not call 3392 * this method unless you are extending ViewGroup and understand the 3393 * view measuring and layout pipeline. 3394 */ 3395 public void removeAllViewsInLayout() { 3396 final int count = mChildrenCount; 3397 if (count <= 0) { 3398 return; 3399 } 3400 3401 final View[] children = mChildren; 3402 mChildrenCount = 0; 3403 3404 final View focused = mFocused; 3405 final boolean detach = mAttachInfo != null; 3406 View clearChildFocus = null; 3407 3408 needGlobalAttributesUpdate(false); 3409 3410 for (int i = count - 1; i >= 0; i--) { 3411 final View view = children[i]; 3412 3413 if (mTransition != null) { 3414 mTransition.removeChild(this, view); 3415 } 3416 3417 if (view == focused) { 3418 view.clearFocusForRemoval(); 3419 clearChildFocus = view; 3420 } 3421 3422 if (view.getAnimation() != null || 3423 (mTransitioningViews != null && mTransitioningViews.contains(view))) { 3424 addDisappearingView(view); 3425 } else if (detach) { 3426 view.dispatchDetachedFromWindow(); 3427 } 3428 3429 onViewRemoved(view); 3430 3431 view.mParent = null; 3432 children[i] = null; 3433 } 3434 3435 if (clearChildFocus != null) { 3436 clearChildFocus(clearChildFocus); 3437 } 3438 } 3439 3440 /** 3441 * Finishes the removal of a detached view. This method will dispatch the detached from 3442 * window event and notify the hierarchy change listener. 3443 * 3444 * @param child the child to be definitely removed from the view hierarchy 3445 * @param animate if true and the view has an animation, the view is placed in the 3446 * disappearing views list, otherwise, it is detached from the window 3447 * 3448 * @see #attachViewToParent(View, int, android.view.ViewGroup.LayoutParams) 3449 * @see #detachAllViewsFromParent() 3450 * @see #detachViewFromParent(View) 3451 * @see #detachViewFromParent(int) 3452 */ 3453 protected void removeDetachedView(View child, boolean animate) { 3454 if (mTransition != null) { 3455 mTransition.removeChild(this, child); 3456 } 3457 3458 if (child == mFocused) { 3459 child.clearFocus(); 3460 } 3461 3462 if ((animate && child.getAnimation() != null) || 3463 (mTransitioningViews != null && mTransitioningViews.contains(child))) { 3464 addDisappearingView(child); 3465 } else if (child.mAttachInfo != null) { 3466 child.dispatchDetachedFromWindow(); 3467 } 3468 3469 onViewRemoved(child); 3470 } 3471 3472 /** 3473 * Attaches a view to this view group. Attaching a view assigns this group as the parent, 3474 * sets the layout parameters and puts the view in the list of children so it can be retrieved 3475 * by calling {@link #getChildAt(int)}. 3476 * 3477 * This method should be called only for view which were detached from their parent. 3478 * 3479 * @param child the child to attach 3480 * @param index the index at which the child should be attached 3481 * @param params the layout parameters of the child 3482 * 3483 * @see #removeDetachedView(View, boolean) 3484 * @see #detachAllViewsFromParent() 3485 * @see #detachViewFromParent(View) 3486 * @see #detachViewFromParent(int) 3487 */ 3488 protected void attachViewToParent(View child, int index, LayoutParams params) { 3489 child.mLayoutParams = params; 3490 3491 if (index < 0) { 3492 index = mChildrenCount; 3493 } 3494 3495 addInArray(child, index); 3496 3497 child.mParent = this; 3498 child.mPrivateFlags = (child.mPrivateFlags & ~DIRTY_MASK & ~DRAWING_CACHE_VALID) | 3499 DRAWN | INVALIDATED; 3500 this.mPrivateFlags |= INVALIDATED; 3501 3502 if (child.hasFocus()) { 3503 requestChildFocus(child, child.findFocus()); 3504 } 3505 } 3506 3507 /** 3508 * Detaches a view from its parent. Detaching a view should be temporary and followed 3509 * either by a call to {@link #attachViewToParent(View, int, android.view.ViewGroup.LayoutParams)} 3510 * or a call to {@link #removeDetachedView(View, boolean)}. When a view is detached, 3511 * its parent is null and cannot be retrieved by a call to {@link #getChildAt(int)}. 3512 * 3513 * @param child the child to detach 3514 * 3515 * @see #detachViewFromParent(int) 3516 * @see #detachViewsFromParent(int, int) 3517 * @see #detachAllViewsFromParent() 3518 * @see #attachViewToParent(View, int, android.view.ViewGroup.LayoutParams) 3519 * @see #removeDetachedView(View, boolean) 3520 */ 3521 protected void detachViewFromParent(View child) { 3522 removeFromArray(indexOfChild(child)); 3523 } 3524 3525 /** 3526 * Detaches a view from its parent. Detaching a view should be temporary and followed 3527 * either by a call to {@link #attachViewToParent(View, int, android.view.ViewGroup.LayoutParams)} 3528 * or a call to {@link #removeDetachedView(View, boolean)}. When a view is detached, 3529 * its parent is null and cannot be retrieved by a call to {@link #getChildAt(int)}. 3530 * 3531 * @param index the index of the child to detach 3532 * 3533 * @see #detachViewFromParent(View) 3534 * @see #detachAllViewsFromParent() 3535 * @see #detachViewsFromParent(int, int) 3536 * @see #attachViewToParent(View, int, android.view.ViewGroup.LayoutParams) 3537 * @see #removeDetachedView(View, boolean) 3538 */ 3539 protected void detachViewFromParent(int index) { 3540 removeFromArray(index); 3541 } 3542 3543 /** 3544 * Detaches a range of view from their parent. Detaching a view should be temporary and followed 3545 * either by a call to {@link #attachViewToParent(View, int, android.view.ViewGroup.LayoutParams)} 3546 * or a call to {@link #removeDetachedView(View, boolean)}. When a view is detached, its 3547 * parent is null and cannot be retrieved by a call to {@link #getChildAt(int)}. 3548 * 3549 * @param start the first index of the childrend range to detach 3550 * @param count the number of children to detach 3551 * 3552 * @see #detachViewFromParent(View) 3553 * @see #detachViewFromParent(int) 3554 * @see #detachAllViewsFromParent() 3555 * @see #attachViewToParent(View, int, android.view.ViewGroup.LayoutParams) 3556 * @see #removeDetachedView(View, boolean) 3557 */ 3558 protected void detachViewsFromParent(int start, int count) { 3559 removeFromArray(start, count); 3560 } 3561 3562 /** 3563 * Detaches all views from the parent. Detaching a view should be temporary and followed 3564 * either by a call to {@link #attachViewToParent(View, int, android.view.ViewGroup.LayoutParams)} 3565 * or a call to {@link #removeDetachedView(View, boolean)}. When a view is detached, 3566 * its parent is null and cannot be retrieved by a call to {@link #getChildAt(int)}. 3567 * 3568 * @see #detachViewFromParent(View) 3569 * @see #detachViewFromParent(int) 3570 * @see #detachViewsFromParent(int, int) 3571 * @see #attachViewToParent(View, int, android.view.ViewGroup.LayoutParams) 3572 * @see #removeDetachedView(View, boolean) 3573 */ 3574 protected void detachAllViewsFromParent() { 3575 final int count = mChildrenCount; 3576 if (count <= 0) { 3577 return; 3578 } 3579 3580 final View[] children = mChildren; 3581 mChildrenCount = 0; 3582 3583 for (int i = count - 1; i >= 0; i--) { 3584 children[i].mParent = null; 3585 children[i] = null; 3586 } 3587 } 3588 3589 /** 3590 * Don't call or override this method. It is used for the implementation of 3591 * the view hierarchy. 3592 */ 3593 public final void invalidateChild(View child, final Rect dirty) { 3594 if (ViewDebug.TRACE_HIERARCHY) { 3595 ViewDebug.trace(this, ViewDebug.HierarchyTraceType.INVALIDATE_CHILD); 3596 } 3597 3598 ViewParent parent = this; 3599 3600 final AttachInfo attachInfo = mAttachInfo; 3601 if (attachInfo != null) { 3602 // If the child is drawing an animation, we want to copy this flag onto 3603 // ourselves and the parent to make sure the invalidate request goes 3604 // through 3605 final boolean drawAnimation = (child.mPrivateFlags & DRAW_ANIMATION) == DRAW_ANIMATION; 3606 3607 if (dirty == null) { 3608 if (child.mLayerType != LAYER_TYPE_NONE) { 3609 mPrivateFlags |= INVALIDATED; 3610 mPrivateFlags &= ~DRAWING_CACHE_VALID; 3611 child.mLocalDirtyRect.setEmpty(); 3612 } 3613 do { 3614 View view = null; 3615 if (parent instanceof View) { 3616 view = (View) parent; 3617 if (view.mLayerType != LAYER_TYPE_NONE) { 3618 view.mLocalDirtyRect.setEmpty(); 3619 if (view.getParent() instanceof View) { 3620 final View grandParent = (View) view.getParent(); 3621 grandParent.mPrivateFlags |= INVALIDATED; 3622 grandParent.mPrivateFlags &= ~DRAWING_CACHE_VALID; 3623 } 3624 } 3625 if ((view.mPrivateFlags & DIRTY_MASK) != 0) { 3626 // already marked dirty - we're done 3627 break; 3628 } 3629 } 3630 3631 if (drawAnimation) { 3632 if (view != null) { 3633 view.mPrivateFlags |= DRAW_ANIMATION; 3634 } else if (parent instanceof ViewRootImpl) { 3635 ((ViewRootImpl) parent).mIsAnimating = true; 3636 } 3637 } 3638 3639 if (parent instanceof ViewRootImpl) { 3640 ((ViewRootImpl) parent).invalidate(); 3641 parent = null; 3642 } else if (view != null) { 3643 if ((view.mPrivateFlags & DRAWN) == DRAWN || 3644 (view.mPrivateFlags & DRAWING_CACHE_VALID) == DRAWING_CACHE_VALID) { 3645 view.mPrivateFlags &= ~DRAWING_CACHE_VALID; 3646 view.mPrivateFlags |= DIRTY; 3647 parent = view.mParent; 3648 } else { 3649 parent = null; 3650 } 3651 } 3652 } while (parent != null); 3653 } else { 3654 // Check whether the child that requests the invalidate is fully opaque 3655 // Views being animated or transformed are not considered opaque because we may 3656 // be invalidating their old position and need the parent to paint behind them. 3657 Matrix childMatrix = child.getMatrix(); 3658 final boolean isOpaque = child.isOpaque() && !drawAnimation && 3659 child.getAnimation() == null && childMatrix.isIdentity(); 3660 // Mark the child as dirty, using the appropriate flag 3661 // Make sure we do not set both flags at the same time 3662 int opaqueFlag = isOpaque ? DIRTY_OPAQUE : DIRTY; 3663 3664 if (child.mLayerType != LAYER_TYPE_NONE) { 3665 mPrivateFlags |= INVALIDATED; 3666 mPrivateFlags &= ~DRAWING_CACHE_VALID; 3667 child.mLocalDirtyRect.union(dirty); 3668 } 3669 3670 final int[] location = attachInfo.mInvalidateChildLocation; 3671 location[CHILD_LEFT_INDEX] = child.mLeft; 3672 location[CHILD_TOP_INDEX] = child.mTop; 3673 if (!childMatrix.isIdentity()) { 3674 RectF boundingRect = attachInfo.mTmpTransformRect; 3675 boundingRect.set(dirty); 3676 //boundingRect.inset(-0.5f, -0.5f); 3677 childMatrix.mapRect(boundingRect); 3678 dirty.set((int) (boundingRect.left - 0.5f), 3679 (int) (boundingRect.top - 0.5f), 3680 (int) (boundingRect.right + 0.5f), 3681 (int) (boundingRect.bottom + 0.5f)); 3682 } 3683 3684 do { 3685 View view = null; 3686 if (parent instanceof View) { 3687 view = (View) parent; 3688 if (view.mLayerType != LAYER_TYPE_NONE && 3689 view.getParent() instanceof View) { 3690 final View grandParent = (View) view.getParent(); 3691 grandParent.mPrivateFlags |= INVALIDATED; 3692 grandParent.mPrivateFlags &= ~DRAWING_CACHE_VALID; 3693 } 3694 } 3695 3696 if (drawAnimation) { 3697 if (view != null) { 3698 view.mPrivateFlags |= DRAW_ANIMATION; 3699 } else if (parent instanceof ViewRootImpl) { 3700 ((ViewRootImpl) parent).mIsAnimating = true; 3701 } 3702 } 3703 3704 // If the parent is dirty opaque or not dirty, mark it dirty with the opaque 3705 // flag coming from the child that initiated the invalidate 3706 if (view != null) { 3707 if ((view.mViewFlags & FADING_EDGE_MASK) != 0 && 3708 view.getSolidColor() == 0) { 3709 opaqueFlag = DIRTY; 3710 } 3711 if ((view.mPrivateFlags & DIRTY_MASK) != DIRTY) { 3712 view.mPrivateFlags = (view.mPrivateFlags & ~DIRTY_MASK) | opaqueFlag; 3713 } 3714 } 3715 3716 parent = parent.invalidateChildInParent(location, dirty); 3717 if (view != null) { 3718 // Account for transform on current parent 3719 Matrix m = view.getMatrix(); 3720 if (!m.isIdentity()) { 3721 RectF boundingRect = attachInfo.mTmpTransformRect; 3722 boundingRect.set(dirty); 3723 m.mapRect(boundingRect); 3724 dirty.set((int) boundingRect.left, (int) boundingRect.top, 3725 (int) (boundingRect.right + 0.5f), 3726 (int) (boundingRect.bottom + 0.5f)); 3727 } 3728 } 3729 } while (parent != null); 3730 } 3731 } 3732 } 3733 3734 /** 3735 * Don't call or override this method. It is used for the implementation of 3736 * the view hierarchy. 3737 * 3738 * This implementation returns null if this ViewGroup does not have a parent, 3739 * if this ViewGroup is already fully invalidated or if the dirty rectangle 3740 * does not intersect with this ViewGroup's bounds. 3741 */ 3742 public ViewParent invalidateChildInParent(final int[] location, final Rect dirty) { 3743 if (ViewDebug.TRACE_HIERARCHY) { 3744 ViewDebug.trace(this, ViewDebug.HierarchyTraceType.INVALIDATE_CHILD_IN_PARENT); 3745 } 3746 3747 if ((mPrivateFlags & DRAWN) == DRAWN || 3748 (mPrivateFlags & DRAWING_CACHE_VALID) == DRAWING_CACHE_VALID) { 3749 if ((mGroupFlags & (FLAG_OPTIMIZE_INVALIDATE | FLAG_ANIMATION_DONE)) != 3750 FLAG_OPTIMIZE_INVALIDATE) { 3751 dirty.offset(location[CHILD_LEFT_INDEX] - mScrollX, 3752 location[CHILD_TOP_INDEX] - mScrollY); 3753 3754 final int left = mLeft; 3755 final int top = mTop; 3756 3757 if ((mGroupFlags & FLAG_CLIP_CHILDREN) != FLAG_CLIP_CHILDREN || 3758 dirty.intersect(0, 0, mRight - left, mBottom - top) || 3759 (mPrivateFlags & DRAW_ANIMATION) == DRAW_ANIMATION) { 3760 mPrivateFlags &= ~DRAWING_CACHE_VALID; 3761 3762 location[CHILD_LEFT_INDEX] = left; 3763 location[CHILD_TOP_INDEX] = top; 3764 3765 if (mLayerType != LAYER_TYPE_NONE) { 3766 mLocalDirtyRect.union(dirty); 3767 } 3768 3769 return mParent; 3770 } 3771 } else { 3772 mPrivateFlags &= ~DRAWN & ~DRAWING_CACHE_VALID; 3773 3774 location[CHILD_LEFT_INDEX] = mLeft; 3775 location[CHILD_TOP_INDEX] = mTop; 3776 if ((mGroupFlags & FLAG_CLIP_CHILDREN) == FLAG_CLIP_CHILDREN) { 3777 dirty.set(0, 0, mRight - mLeft, mBottom - mTop); 3778 } else { 3779 // in case the dirty rect extends outside the bounds of this container 3780 dirty.union(0, 0, mRight - mLeft, mBottom - mTop); 3781 } 3782 3783 if (mLayerType != LAYER_TYPE_NONE) { 3784 mLocalDirtyRect.union(dirty); 3785 } 3786 3787 return mParent; 3788 } 3789 } 3790 3791 return null; 3792 } 3793 3794 /** 3795 * Offset a rectangle that is in a descendant's coordinate 3796 * space into our coordinate space. 3797 * @param descendant A descendant of this view 3798 * @param rect A rectangle defined in descendant's coordinate space. 3799 */ 3800 public final void offsetDescendantRectToMyCoords(View descendant, Rect rect) { 3801 offsetRectBetweenParentAndChild(descendant, rect, true, false); 3802 } 3803 3804 /** 3805 * Offset a rectangle that is in our coordinate space into an ancestor's 3806 * coordinate space. 3807 * @param descendant A descendant of this view 3808 * @param rect A rectangle defined in descendant's coordinate space. 3809 */ 3810 public final void offsetRectIntoDescendantCoords(View descendant, Rect rect) { 3811 offsetRectBetweenParentAndChild(descendant, rect, false, false); 3812 } 3813 3814 /** 3815 * Helper method that offsets a rect either from parent to descendant or 3816 * descendant to parent. 3817 */ 3818 void offsetRectBetweenParentAndChild(View descendant, Rect rect, 3819 boolean offsetFromChildToParent, boolean clipToBounds) { 3820 3821 // already in the same coord system :) 3822 if (descendant == this) { 3823 return; 3824 } 3825 3826 ViewParent theParent = descendant.mParent; 3827 3828 // search and offset up to the parent 3829 while ((theParent != null) 3830 && (theParent instanceof View) 3831 && (theParent != this)) { 3832 3833 if (offsetFromChildToParent) { 3834 rect.offset(descendant.mLeft - descendant.mScrollX, 3835 descendant.mTop - descendant.mScrollY); 3836 if (clipToBounds) { 3837 View p = (View) theParent; 3838 rect.intersect(0, 0, p.mRight - p.mLeft, p.mBottom - p.mTop); 3839 } 3840 } else { 3841 if (clipToBounds) { 3842 View p = (View) theParent; 3843 rect.intersect(0, 0, p.mRight - p.mLeft, p.mBottom - p.mTop); 3844 } 3845 rect.offset(descendant.mScrollX - descendant.mLeft, 3846 descendant.mScrollY - descendant.mTop); 3847 } 3848 3849 descendant = (View) theParent; 3850 theParent = descendant.mParent; 3851 } 3852 3853 // now that we are up to this view, need to offset one more time 3854 // to get into our coordinate space 3855 if (theParent == this) { 3856 if (offsetFromChildToParent) { 3857 rect.offset(descendant.mLeft - descendant.mScrollX, 3858 descendant.mTop - descendant.mScrollY); 3859 } else { 3860 rect.offset(descendant.mScrollX - descendant.mLeft, 3861 descendant.mScrollY - descendant.mTop); 3862 } 3863 } else { 3864 throw new IllegalArgumentException("parameter must be a descendant of this view"); 3865 } 3866 } 3867 3868 /** 3869 * Offset the vertical location of all children of this view by the specified number of pixels. 3870 * 3871 * @param offset the number of pixels to offset 3872 * 3873 * @hide 3874 */ 3875 public void offsetChildrenTopAndBottom(int offset) { 3876 final int count = mChildrenCount; 3877 final View[] children = mChildren; 3878 3879 for (int i = 0; i < count; i++) { 3880 final View v = children[i]; 3881 v.mTop += offset; 3882 v.mBottom += offset; 3883 } 3884 } 3885 3886 /** 3887 * {@inheritDoc} 3888 */ 3889 public boolean getChildVisibleRect(View child, Rect r, android.graphics.Point offset) { 3890 // It doesn't make a whole lot of sense to call this on a view that isn't attached, 3891 // but for some simple tests it can be useful. If we don't have attach info this 3892 // will allocate memory. 3893 final RectF rect = mAttachInfo != null ? mAttachInfo.mTmpTransformRect : new RectF(); 3894 rect.set(r); 3895 3896 if (!child.hasIdentityMatrix()) { 3897 child.getMatrix().mapRect(rect); 3898 } 3899 3900 int dx = child.mLeft - mScrollX; 3901 int dy = child.mTop - mScrollY; 3902 3903 rect.offset(dx, dy); 3904 3905 if (offset != null) { 3906 if (!child.hasIdentityMatrix()) { 3907 float[] position = mAttachInfo != null ? mAttachInfo.mTmpTransformLocation 3908 : new float[2]; 3909 position[0] = offset.x; 3910 position[1] = offset.y; 3911 child.getMatrix().mapPoints(position); 3912 offset.x = (int) (position[0] + 0.5f); 3913 offset.y = (int) (position[1] + 0.5f); 3914 } 3915 offset.x += dx; 3916 offset.y += dy; 3917 } 3918 3919 if (rect.intersect(0, 0, mRight - mLeft, mBottom - mTop)) { 3920 if (mParent == null) return true; 3921 r.set((int) (rect.left + 0.5f), (int) (rect.top + 0.5f), 3922 (int) (rect.right + 0.5f), (int) (rect.bottom + 0.5f)); 3923 return mParent.getChildVisibleRect(this, r, offset); 3924 } 3925 3926 return false; 3927 } 3928 3929 /** 3930 * {@inheritDoc} 3931 */ 3932 @Override 3933 public final void layout(int l, int t, int r, int b) { 3934 if (mTransition == null || !mTransition.isChangingLayout()) { 3935 super.layout(l, t, r, b); 3936 } else { 3937 // record the fact that we noop'd it; request layout when transition finishes 3938 mLayoutSuppressed = true; 3939 } 3940 } 3941 3942 /** 3943 * {@inheritDoc} 3944 */ 3945 @Override 3946 protected abstract void onLayout(boolean changed, 3947 int l, int t, int r, int b); 3948 3949 /** 3950 * Indicates whether the view group has the ability to animate its children 3951 * after the first layout. 3952 * 3953 * @return true if the children can be animated, false otherwise 3954 */ 3955 protected boolean canAnimate() { 3956 return mLayoutAnimationController != null; 3957 } 3958 3959 /** 3960 * Runs the layout animation. Calling this method triggers a relayout of 3961 * this view group. 3962 */ 3963 public void startLayoutAnimation() { 3964 if (mLayoutAnimationController != null) { 3965 mGroupFlags |= FLAG_RUN_ANIMATION; 3966 requestLayout(); 3967 } 3968 } 3969 3970 /** 3971 * Schedules the layout animation to be played after the next layout pass 3972 * of this view group. This can be used to restart the layout animation 3973 * when the content of the view group changes or when the activity is 3974 * paused and resumed. 3975 */ 3976 public void scheduleLayoutAnimation() { 3977 mGroupFlags |= FLAG_RUN_ANIMATION; 3978 } 3979 3980 /** 3981 * Sets the layout animation controller used to animate the group's 3982 * children after the first layout. 3983 * 3984 * @param controller the animation controller 3985 */ 3986 public void setLayoutAnimation(LayoutAnimationController controller) { 3987 mLayoutAnimationController = controller; 3988 if (mLayoutAnimationController != null) { 3989 mGroupFlags |= FLAG_RUN_ANIMATION; 3990 } 3991 } 3992 3993 /** 3994 * Returns the layout animation controller used to animate the group's 3995 * children. 3996 * 3997 * @return the current animation controller 3998 */ 3999 public LayoutAnimationController getLayoutAnimation() { 4000 return mLayoutAnimationController; 4001 } 4002 4003 /** 4004 * Indicates whether the children's drawing cache is used during a layout 4005 * animation. By default, the drawing cache is enabled but this will prevent 4006 * nested layout animations from working. To nest animations, you must disable 4007 * the cache. 4008 * 4009 * @return true if the animation cache is enabled, false otherwise 4010 * 4011 * @see #setAnimationCacheEnabled(boolean) 4012 * @see View#setDrawingCacheEnabled(boolean) 4013 */ 4014 @ViewDebug.ExportedProperty 4015 public boolean isAnimationCacheEnabled() { 4016 return (mGroupFlags & FLAG_ANIMATION_CACHE) == FLAG_ANIMATION_CACHE; 4017 } 4018 4019 /** 4020 * Enables or disables the children's drawing cache during a layout animation. 4021 * By default, the drawing cache is enabled but this will prevent nested 4022 * layout animations from working. To nest animations, you must disable the 4023 * cache. 4024 * 4025 * @param enabled true to enable the animation cache, false otherwise 4026 * 4027 * @see #isAnimationCacheEnabled() 4028 * @see View#setDrawingCacheEnabled(boolean) 4029 */ 4030 public void setAnimationCacheEnabled(boolean enabled) { 4031 setBooleanFlag(FLAG_ANIMATION_CACHE, enabled); 4032 } 4033 4034 /** 4035 * Indicates whether this ViewGroup will always try to draw its children using their 4036 * drawing cache. By default this property is enabled. 4037 * 4038 * @return true if the animation cache is enabled, false otherwise 4039 * 4040 * @see #setAlwaysDrawnWithCacheEnabled(boolean) 4041 * @see #setChildrenDrawnWithCacheEnabled(boolean) 4042 * @see View#setDrawingCacheEnabled(boolean) 4043 */ 4044 @ViewDebug.ExportedProperty(category = "drawing") 4045 public boolean isAlwaysDrawnWithCacheEnabled() { 4046 return (mGroupFlags & FLAG_ALWAYS_DRAWN_WITH_CACHE) == FLAG_ALWAYS_DRAWN_WITH_CACHE; 4047 } 4048 4049 /** 4050 * Indicates whether this ViewGroup will always try to draw its children using their 4051 * drawing cache. This property can be set to true when the cache rendering is 4052 * slightly different from the children's normal rendering. Renderings can be different, 4053 * for instance, when the cache's quality is set to low. 4054 * 4055 * When this property is disabled, the ViewGroup will use the drawing cache of its 4056 * children only when asked to. It's usually the task of subclasses to tell ViewGroup 4057 * when to start using the drawing cache and when to stop using it. 4058 * 4059 * @param always true to always draw with the drawing cache, false otherwise 4060 * 4061 * @see #isAlwaysDrawnWithCacheEnabled() 4062 * @see #setChildrenDrawnWithCacheEnabled(boolean) 4063 * @see View#setDrawingCacheEnabled(boolean) 4064 * @see View#setDrawingCacheQuality(int) 4065 */ 4066 public void setAlwaysDrawnWithCacheEnabled(boolean always) { 4067 setBooleanFlag(FLAG_ALWAYS_DRAWN_WITH_CACHE, always); 4068 } 4069 4070 /** 4071 * Indicates whether the ViewGroup is currently drawing its children using 4072 * their drawing cache. 4073 * 4074 * @return true if children should be drawn with their cache, false otherwise 4075 * 4076 * @see #setAlwaysDrawnWithCacheEnabled(boolean) 4077 * @see #setChildrenDrawnWithCacheEnabled(boolean) 4078 */ 4079 @ViewDebug.ExportedProperty(category = "drawing") 4080 protected boolean isChildrenDrawnWithCacheEnabled() { 4081 return (mGroupFlags & FLAG_CHILDREN_DRAWN_WITH_CACHE) == FLAG_CHILDREN_DRAWN_WITH_CACHE; 4082 } 4083 4084 /** 4085 * Tells the ViewGroup to draw its children using their drawing cache. This property 4086 * is ignored when {@link #isAlwaysDrawnWithCacheEnabled()} is true. A child's drawing cache 4087 * will be used only if it has been enabled. 4088 * 4089 * Subclasses should call this method to start and stop using the drawing cache when 4090 * they perform performance sensitive operations, like scrolling or animating. 4091 * 4092 * @param enabled true if children should be drawn with their cache, false otherwise 4093 * 4094 * @see #setAlwaysDrawnWithCacheEnabled(boolean) 4095 * @see #isChildrenDrawnWithCacheEnabled() 4096 */ 4097 protected void setChildrenDrawnWithCacheEnabled(boolean enabled) { 4098 setBooleanFlag(FLAG_CHILDREN_DRAWN_WITH_CACHE, enabled); 4099 } 4100 4101 /** 4102 * Indicates whether the ViewGroup is drawing its children in the order defined by 4103 * {@link #getChildDrawingOrder(int, int)}. 4104 * 4105 * @return true if children drawing order is defined by {@link #getChildDrawingOrder(int, int)}, 4106 * false otherwise 4107 * 4108 * @see #setChildrenDrawingOrderEnabled(boolean) 4109 * @see #getChildDrawingOrder(int, int) 4110 */ 4111 @ViewDebug.ExportedProperty(category = "drawing") 4112 protected boolean isChildrenDrawingOrderEnabled() { 4113 return (mGroupFlags & FLAG_USE_CHILD_DRAWING_ORDER) == FLAG_USE_CHILD_DRAWING_ORDER; 4114 } 4115 4116 /** 4117 * Tells the ViewGroup whether to draw its children in the order defined by the method 4118 * {@link #getChildDrawingOrder(int, int)}. 4119 * 4120 * @param enabled true if the order of the children when drawing is determined by 4121 * {@link #getChildDrawingOrder(int, int)}, false otherwise 4122 * 4123 * @see #isChildrenDrawingOrderEnabled() 4124 * @see #getChildDrawingOrder(int, int) 4125 */ 4126 protected void setChildrenDrawingOrderEnabled(boolean enabled) { 4127 setBooleanFlag(FLAG_USE_CHILD_DRAWING_ORDER, enabled); 4128 } 4129 4130 private void setBooleanFlag(int flag, boolean value) { 4131 if (value) { 4132 mGroupFlags |= flag; 4133 } else { 4134 mGroupFlags &= ~flag; 4135 } 4136 } 4137 4138 /** 4139 * Returns an integer indicating what types of drawing caches are kept in memory. 4140 * 4141 * @see #setPersistentDrawingCache(int) 4142 * @see #setAnimationCacheEnabled(boolean) 4143 * 4144 * @return one or a combination of {@link #PERSISTENT_NO_CACHE}, 4145 * {@link #PERSISTENT_ANIMATION_CACHE}, {@link #PERSISTENT_SCROLLING_CACHE} 4146 * and {@link #PERSISTENT_ALL_CACHES} 4147 */ 4148 @ViewDebug.ExportedProperty(category = "drawing", mapping = { 4149 @ViewDebug.IntToString(from = PERSISTENT_NO_CACHE, to = "NONE"), 4150 @ViewDebug.IntToString(from = PERSISTENT_ANIMATION_CACHE, to = "ANIMATION"), 4151 @ViewDebug.IntToString(from = PERSISTENT_SCROLLING_CACHE, to = "SCROLLING"), 4152 @ViewDebug.IntToString(from = PERSISTENT_ALL_CACHES, to = "ALL") 4153 }) 4154 public int getPersistentDrawingCache() { 4155 return mPersistentDrawingCache; 4156 } 4157 4158 /** 4159 * Indicates what types of drawing caches should be kept in memory after 4160 * they have been created. 4161 * 4162 * @see #getPersistentDrawingCache() 4163 * @see #setAnimationCacheEnabled(boolean) 4164 * 4165 * @param drawingCacheToKeep one or a combination of {@link #PERSISTENT_NO_CACHE}, 4166 * {@link #PERSISTENT_ANIMATION_CACHE}, {@link #PERSISTENT_SCROLLING_CACHE} 4167 * and {@link #PERSISTENT_ALL_CACHES} 4168 */ 4169 public void setPersistentDrawingCache(int drawingCacheToKeep) { 4170 mPersistentDrawingCache = drawingCacheToKeep & PERSISTENT_ALL_CACHES; 4171 } 4172 4173 /** 4174 * Returns a new set of layout parameters based on the supplied attributes set. 4175 * 4176 * @param attrs the attributes to build the layout parameters from 4177 * 4178 * @return an instance of {@link android.view.ViewGroup.LayoutParams} or one 4179 * of its descendants 4180 */ 4181 public LayoutParams generateLayoutParams(AttributeSet attrs) { 4182 return new LayoutParams(getContext(), attrs); 4183 } 4184 4185 /** 4186 * Returns a safe set of layout parameters based on the supplied layout params. 4187 * When a ViewGroup is passed a View whose layout params do not pass the test of 4188 * {@link #checkLayoutParams(android.view.ViewGroup.LayoutParams)}, this method 4189 * is invoked. This method should return a new set of layout params suitable for 4190 * this ViewGroup, possibly by copying the appropriate attributes from the 4191 * specified set of layout params. 4192 * 4193 * @param p The layout parameters to convert into a suitable set of layout parameters 4194 * for this ViewGroup. 4195 * 4196 * @return an instance of {@link android.view.ViewGroup.LayoutParams} or one 4197 * of its descendants 4198 */ 4199 protected LayoutParams generateLayoutParams(ViewGroup.LayoutParams p) { 4200 return p; 4201 } 4202 4203 /** 4204 * Returns a set of default layout parameters. These parameters are requested 4205 * when the View passed to {@link #addView(View)} has no layout parameters 4206 * already set. If null is returned, an exception is thrown from addView. 4207 * 4208 * @return a set of default layout parameters or null 4209 */ 4210 protected LayoutParams generateDefaultLayoutParams() { 4211 return new LayoutParams(LayoutParams.WRAP_CONTENT, LayoutParams.WRAP_CONTENT); 4212 } 4213 4214 /** 4215 * @hide 4216 */ 4217 @Override 4218 protected boolean dispatchConsistencyCheck(int consistency) { 4219 boolean result = super.dispatchConsistencyCheck(consistency); 4220 4221 final int count = mChildrenCount; 4222 final View[] children = mChildren; 4223 for (int i = 0; i < count; i++) { 4224 if (!children[i].dispatchConsistencyCheck(consistency)) result = false; 4225 } 4226 4227 return result; 4228 } 4229 4230 /** 4231 * @hide 4232 */ 4233 @Override 4234 protected boolean onConsistencyCheck(int consistency) { 4235 boolean result = super.onConsistencyCheck(consistency); 4236 4237 final boolean checkLayout = (consistency & ViewDebug.CONSISTENCY_LAYOUT) != 0; 4238 final boolean checkDrawing = (consistency & ViewDebug.CONSISTENCY_DRAWING) != 0; 4239 4240 if (checkLayout) { 4241 final int count = mChildrenCount; 4242 final View[] children = mChildren; 4243 for (int i = 0; i < count; i++) { 4244 if (children[i].getParent() != this) { 4245 result = false; 4246 android.util.Log.d(ViewDebug.CONSISTENCY_LOG_TAG, 4247 "View " + children[i] + " has no parent/a parent that is not " + this); 4248 } 4249 } 4250 } 4251 4252 if (checkDrawing) { 4253 // If this group is dirty, check that the parent is dirty as well 4254 if ((mPrivateFlags & DIRTY_MASK) != 0) { 4255 final ViewParent parent = getParent(); 4256 if (parent != null && !(parent instanceof ViewRootImpl)) { 4257 if ((((View) parent).mPrivateFlags & DIRTY_MASK) == 0) { 4258 result = false; 4259 android.util.Log.d(ViewDebug.CONSISTENCY_LOG_TAG, 4260 "ViewGroup " + this + " is dirty but its parent is not: " + this); 4261 } 4262 } 4263 } 4264 } 4265 4266 return result; 4267 } 4268 4269 /** 4270 * {@inheritDoc} 4271 */ 4272 @Override 4273 protected void debug(int depth) { 4274 super.debug(depth); 4275 String output; 4276 4277 if (mFocused != null) { 4278 output = debugIndent(depth); 4279 output += "mFocused"; 4280 Log.d(VIEW_LOG_TAG, output); 4281 } 4282 if (mChildrenCount != 0) { 4283 output = debugIndent(depth); 4284 output += "{"; 4285 Log.d(VIEW_LOG_TAG, output); 4286 } 4287 int count = mChildrenCount; 4288 for (int i = 0; i < count; i++) { 4289 View child = mChildren[i]; 4290 child.debug(depth + 1); 4291 } 4292 4293 if (mChildrenCount != 0) { 4294 output = debugIndent(depth); 4295 output += "}"; 4296 Log.d(VIEW_LOG_TAG, output); 4297 } 4298 } 4299 4300 /** 4301 * Returns the position in the group of the specified child view. 4302 * 4303 * @param child the view for which to get the position 4304 * @return a positive integer representing the position of the view in the 4305 * group, or -1 if the view does not exist in the group 4306 */ 4307 public int indexOfChild(View child) { 4308 final int count = mChildrenCount; 4309 final View[] children = mChildren; 4310 for (int i = 0; i < count; i++) { 4311 if (children[i] == child) { 4312 return i; 4313 } 4314 } 4315 return -1; 4316 } 4317 4318 /** 4319 * Returns the number of children in the group. 4320 * 4321 * @return a positive integer representing the number of children in 4322 * the group 4323 */ 4324 public int getChildCount() { 4325 return mChildrenCount; 4326 } 4327 4328 /** 4329 * Returns the view at the specified position in the group. 4330 * 4331 * @param index the position at which to get the view from 4332 * @return the view at the specified position or null if the position 4333 * does not exist within the group 4334 */ 4335 public View getChildAt(int index) { 4336 if (index < 0 || index >= mChildrenCount) { 4337 return null; 4338 } 4339 return mChildren[index]; 4340 } 4341 4342 /** 4343 * Ask all of the children of this view to measure themselves, taking into 4344 * account both the MeasureSpec requirements for this view and its padding. 4345 * We skip children that are in the GONE state The heavy lifting is done in 4346 * getChildMeasureSpec. 4347 * 4348 * @param widthMeasureSpec The width requirements for this view 4349 * @param heightMeasureSpec The height requirements for this view 4350 */ 4351 protected void measureChildren(int widthMeasureSpec, int heightMeasureSpec) { 4352 final int size = mChildrenCount; 4353 final View[] children = mChildren; 4354 for (int i = 0; i < size; ++i) { 4355 final View child = children[i]; 4356 if ((child.mViewFlags & VISIBILITY_MASK) != GONE) { 4357 measureChild(child, widthMeasureSpec, heightMeasureSpec); 4358 } 4359 } 4360 } 4361 4362 /** 4363 * Ask one of the children of this view to measure itself, taking into 4364 * account both the MeasureSpec requirements for this view and its padding. 4365 * The heavy lifting is done in getChildMeasureSpec. 4366 * 4367 * @param child The child to measure 4368 * @param parentWidthMeasureSpec The width requirements for this view 4369 * @param parentHeightMeasureSpec The height requirements for this view 4370 */ 4371 protected void measureChild(View child, int parentWidthMeasureSpec, 4372 int parentHeightMeasureSpec) { 4373 final LayoutParams lp = child.getLayoutParams(); 4374 4375 final int childWidthMeasureSpec = getChildMeasureSpec(parentWidthMeasureSpec, 4376 mPaddingLeft + mPaddingRight, lp.width); 4377 final int childHeightMeasureSpec = getChildMeasureSpec(parentHeightMeasureSpec, 4378 mPaddingTop + mPaddingBottom, lp.height); 4379 4380 child.measure(childWidthMeasureSpec, childHeightMeasureSpec); 4381 } 4382 4383 /** 4384 * Ask one of the children of this view to measure itself, taking into 4385 * account both the MeasureSpec requirements for this view and its padding 4386 * and margins. The child must have MarginLayoutParams The heavy lifting is 4387 * done in getChildMeasureSpec. 4388 * 4389 * @param child The child to measure 4390 * @param parentWidthMeasureSpec The width requirements for this view 4391 * @param widthUsed Extra space that has been used up by the parent 4392 * horizontally (possibly by other children of the parent) 4393 * @param parentHeightMeasureSpec The height requirements for this view 4394 * @param heightUsed Extra space that has been used up by the parent 4395 * vertically (possibly by other children of the parent) 4396 */ 4397 protected void measureChildWithMargins(View child, 4398 int parentWidthMeasureSpec, int widthUsed, 4399 int parentHeightMeasureSpec, int heightUsed) { 4400 final MarginLayoutParams lp = (MarginLayoutParams) child.getLayoutParams(); 4401 4402 final int childWidthMeasureSpec = getChildMeasureSpec(parentWidthMeasureSpec, 4403 mPaddingLeft + mPaddingRight + lp.leftMargin + lp.rightMargin 4404 + widthUsed, lp.width); 4405 final int childHeightMeasureSpec = getChildMeasureSpec(parentHeightMeasureSpec, 4406 mPaddingTop + mPaddingBottom + lp.topMargin + lp.bottomMargin 4407 + heightUsed, lp.height); 4408 4409 child.measure(childWidthMeasureSpec, childHeightMeasureSpec); 4410 } 4411 4412 /** 4413 * Does the hard part of measureChildren: figuring out the MeasureSpec to 4414 * pass to a particular child. This method figures out the right MeasureSpec 4415 * for one dimension (height or width) of one child view. 4416 * 4417 * The goal is to combine information from our MeasureSpec with the 4418 * LayoutParams of the child to get the best possible results. For example, 4419 * if the this view knows its size (because its MeasureSpec has a mode of 4420 * EXACTLY), and the child has indicated in its LayoutParams that it wants 4421 * to be the same size as the parent, the parent should ask the child to 4422 * layout given an exact size. 4423 * 4424 * @param spec The requirements for this view 4425 * @param padding The padding of this view for the current dimension and 4426 * margins, if applicable 4427 * @param childDimension How big the child wants to be in the current 4428 * dimension 4429 * @return a MeasureSpec integer for the child 4430 */ 4431 public static int getChildMeasureSpec(int spec, int padding, int childDimension) { 4432 int specMode = MeasureSpec.getMode(spec); 4433 int specSize = MeasureSpec.getSize(spec); 4434 4435 int size = Math.max(0, specSize - padding); 4436 4437 int resultSize = 0; 4438 int resultMode = 0; 4439 4440 switch (specMode) { 4441 // Parent has imposed an exact size on us 4442 case MeasureSpec.EXACTLY: 4443 if (childDimension >= 0) { 4444 resultSize = childDimension; 4445 resultMode = MeasureSpec.EXACTLY; 4446 } else if (childDimension == LayoutParams.MATCH_PARENT) { 4447 // Child wants to be our size. So be it. 4448 resultSize = size; 4449 resultMode = MeasureSpec.EXACTLY; 4450 } else if (childDimension == LayoutParams.WRAP_CONTENT) { 4451 // Child wants to determine its own size. It can't be 4452 // bigger than us. 4453 resultSize = size; 4454 resultMode = MeasureSpec.AT_MOST; 4455 } 4456 break; 4457 4458 // Parent has imposed a maximum size on us 4459 case MeasureSpec.AT_MOST: 4460 if (childDimension >= 0) { 4461 // Child wants a specific size... so be it 4462 resultSize = childDimension; 4463 resultMode = MeasureSpec.EXACTLY; 4464 } else if (childDimension == LayoutParams.MATCH_PARENT) { 4465 // Child wants to be our size, but our size is not fixed. 4466 // Constrain child to not be bigger than us. 4467 resultSize = size; 4468 resultMode = MeasureSpec.AT_MOST; 4469 } else if (childDimension == LayoutParams.WRAP_CONTENT) { 4470 // Child wants to determine its own size. It can't be 4471 // bigger than us. 4472 resultSize = size; 4473 resultMode = MeasureSpec.AT_MOST; 4474 } 4475 break; 4476 4477 // Parent asked to see how big we want to be 4478 case MeasureSpec.UNSPECIFIED: 4479 if (childDimension >= 0) { 4480 // Child wants a specific size... let him have it 4481 resultSize = childDimension; 4482 resultMode = MeasureSpec.EXACTLY; 4483 } else if (childDimension == LayoutParams.MATCH_PARENT) { 4484 // Child wants to be our size... find out how big it should 4485 // be 4486 resultSize = 0; 4487 resultMode = MeasureSpec.UNSPECIFIED; 4488 } else if (childDimension == LayoutParams.WRAP_CONTENT) { 4489 // Child wants to determine its own size.... find out how 4490 // big it should be 4491 resultSize = 0; 4492 resultMode = MeasureSpec.UNSPECIFIED; 4493 } 4494 break; 4495 } 4496 return MeasureSpec.makeMeasureSpec(resultSize, resultMode); 4497 } 4498 4499 4500 /** 4501 * Removes any pending animations for views that have been removed. Call 4502 * this if you don't want animations for exiting views to stack up. 4503 */ 4504 public void clearDisappearingChildren() { 4505 if (mDisappearingChildren != null) { 4506 mDisappearingChildren.clear(); 4507 } 4508 } 4509 4510 /** 4511 * Add a view which is removed from mChildren but still needs animation 4512 * 4513 * @param v View to add 4514 */ 4515 private void addDisappearingView(View v) { 4516 ArrayList<View> disappearingChildren = mDisappearingChildren; 4517 4518 if (disappearingChildren == null) { 4519 disappearingChildren = mDisappearingChildren = new ArrayList<View>(); 4520 } 4521 4522 disappearingChildren.add(v); 4523 } 4524 4525 /** 4526 * Cleanup a view when its animation is done. This may mean removing it from 4527 * the list of disappearing views. 4528 * 4529 * @param view The view whose animation has finished 4530 * @param animation The animation, cannot be null 4531 */ 4532 void finishAnimatingView(final View view, Animation animation) { 4533 final ArrayList<View> disappearingChildren = mDisappearingChildren; 4534 if (disappearingChildren != null) { 4535 if (disappearingChildren.contains(view)) { 4536 disappearingChildren.remove(view); 4537 4538 if (view.mAttachInfo != null) { 4539 view.dispatchDetachedFromWindow(); 4540 } 4541 4542 view.clearAnimation(); 4543 mGroupFlags |= FLAG_INVALIDATE_REQUIRED; 4544 } 4545 } 4546 4547 if (animation != null && !animation.getFillAfter()) { 4548 view.clearAnimation(); 4549 } 4550 4551 if ((view.mPrivateFlags & ANIMATION_STARTED) == ANIMATION_STARTED) { 4552 view.onAnimationEnd(); 4553 // Should be performed by onAnimationEnd() but this avoid an infinite loop, 4554 // so we'd rather be safe than sorry 4555 view.mPrivateFlags &= ~ANIMATION_STARTED; 4556 // Draw one more frame after the animation is done 4557 mGroupFlags |= FLAG_INVALIDATE_REQUIRED; 4558 } 4559 } 4560 4561 /** 4562 * Utility function called by View during invalidation to determine whether a view that 4563 * is invisible or gone should still be invalidated because it is being transitioned (and 4564 * therefore still needs to be drawn). 4565 */ 4566 boolean isViewTransitioning(View view) { 4567 return (mTransitioningViews != null && mTransitioningViews.contains(view)); 4568 } 4569 4570 /** 4571 * This method tells the ViewGroup that the given View object, which should have this 4572 * ViewGroup as its parent, 4573 * should be kept around (re-displayed when the ViewGroup draws its children) even if it 4574 * is removed from its parent. This allows animations, such as those used by 4575 * {@link android.app.Fragment} and {@link android.animation.LayoutTransition} to animate 4576 * the removal of views. A call to this method should always be accompanied by a later call 4577 * to {@link #endViewTransition(View)}, such as after an animation on the View has finished, 4578 * so that the View finally gets removed. 4579 * 4580 * @param view The View object to be kept visible even if it gets removed from its parent. 4581 */ 4582 public void startViewTransition(View view) { 4583 if (view.mParent == this) { 4584 if (mTransitioningViews == null) { 4585 mTransitioningViews = new ArrayList<View>(); 4586 } 4587 mTransitioningViews.add(view); 4588 } 4589 } 4590 4591 /** 4592 * This method should always be called following an earlier call to 4593 * {@link #startViewTransition(View)}. The given View is finally removed from its parent 4594 * and will no longer be displayed. Note that this method does not perform the functionality 4595 * of removing a view from its parent; it just discontinues the display of a View that 4596 * has previously been removed. 4597 * 4598 * @return view The View object that has been removed but is being kept around in the visible 4599 * hierarchy by an earlier call to {@link #startViewTransition(View)}. 4600 */ 4601 public void endViewTransition(View view) { 4602 if (mTransitioningViews != null) { 4603 mTransitioningViews.remove(view); 4604 final ArrayList<View> disappearingChildren = mDisappearingChildren; 4605 if (disappearingChildren != null && disappearingChildren.contains(view)) { 4606 disappearingChildren.remove(view); 4607 if (mVisibilityChangingChildren != null && 4608 mVisibilityChangingChildren.contains(view)) { 4609 mVisibilityChangingChildren.remove(view); 4610 } else { 4611 if (view.mAttachInfo != null) { 4612 view.dispatchDetachedFromWindow(); 4613 } 4614 if (view.mParent != null) { 4615 view.mParent = null; 4616 } 4617 } 4618 mGroupFlags |= FLAG_INVALIDATE_REQUIRED; 4619 } 4620 } 4621 } 4622 4623 private LayoutTransition.TransitionListener mLayoutTransitionListener = 4624 new LayoutTransition.TransitionListener() { 4625 @Override 4626 public void startTransition(LayoutTransition transition, ViewGroup container, 4627 View view, int transitionType) { 4628 // We only care about disappearing items, since we need special logic to keep 4629 // those items visible after they've been 'removed' 4630 if (transitionType == LayoutTransition.DISAPPEARING) { 4631 startViewTransition(view); 4632 } 4633 } 4634 4635 @Override 4636 public void endTransition(LayoutTransition transition, ViewGroup container, 4637 View view, int transitionType) { 4638 if (mLayoutSuppressed && !transition.isChangingLayout()) { 4639 requestLayout(); 4640 mLayoutSuppressed = false; 4641 } 4642 if (transitionType == LayoutTransition.DISAPPEARING && mTransitioningViews != null) { 4643 endViewTransition(view); 4644 } 4645 } 4646 }; 4647 4648 /** 4649 * {@inheritDoc} 4650 */ 4651 @Override 4652 public boolean gatherTransparentRegion(Region region) { 4653 // If no transparent regions requested, we are always opaque. 4654 final boolean meOpaque = (mPrivateFlags & View.REQUEST_TRANSPARENT_REGIONS) == 0; 4655 if (meOpaque && region == null) { 4656 // The caller doesn't care about the region, so stop now. 4657 return true; 4658 } 4659 super.gatherTransparentRegion(region); 4660 final View[] children = mChildren; 4661 final int count = mChildrenCount; 4662 boolean noneOfTheChildrenAreTransparent = true; 4663 for (int i = 0; i < count; i++) { 4664 final View child = children[i]; 4665 if ((child.mViewFlags & VISIBILITY_MASK) == VISIBLE || child.getAnimation() != null) { 4666 if (!child.gatherTransparentRegion(region)) { 4667 noneOfTheChildrenAreTransparent = false; 4668 } 4669 } 4670 } 4671 return meOpaque || noneOfTheChildrenAreTransparent; 4672 } 4673 4674 /** 4675 * {@inheritDoc} 4676 */ 4677 public void requestTransparentRegion(View child) { 4678 if (child != null) { 4679 child.mPrivateFlags |= View.REQUEST_TRANSPARENT_REGIONS; 4680 if (mParent != null) { 4681 mParent.requestTransparentRegion(this); 4682 } 4683 } 4684 } 4685 4686 4687 @Override 4688 protected boolean fitSystemWindows(Rect insets) { 4689 boolean done = super.fitSystemWindows(insets); 4690 if (!done) { 4691 final int count = mChildrenCount; 4692 final View[] children = mChildren; 4693 for (int i = 0; i < count; i++) { 4694 done = children[i].fitSystemWindows(insets); 4695 if (done) { 4696 break; 4697 } 4698 } 4699 } 4700 return done; 4701 } 4702 4703 /** 4704 * Returns the animation listener to which layout animation events are 4705 * sent. 4706 * 4707 * @return an {@link android.view.animation.Animation.AnimationListener} 4708 */ 4709 public Animation.AnimationListener getLayoutAnimationListener() { 4710 return mAnimationListener; 4711 } 4712 4713 @Override 4714 protected void drawableStateChanged() { 4715 super.drawableStateChanged(); 4716 4717 if ((mGroupFlags & FLAG_NOTIFY_CHILDREN_ON_DRAWABLE_STATE_CHANGE) != 0) { 4718 if ((mGroupFlags & FLAG_ADD_STATES_FROM_CHILDREN) != 0) { 4719 throw new IllegalStateException("addStateFromChildren cannot be enabled if a" 4720 + " child has duplicateParentState set to true"); 4721 } 4722 4723 final View[] children = mChildren; 4724 final int count = mChildrenCount; 4725 4726 for (int i = 0; i < count; i++) { 4727 final View child = children[i]; 4728 if ((child.mViewFlags & DUPLICATE_PARENT_STATE) != 0) { 4729 child.refreshDrawableState(); 4730 } 4731 } 4732 } 4733 } 4734 4735 @Override 4736 public void jumpDrawablesToCurrentState() { 4737 super.jumpDrawablesToCurrentState(); 4738 final View[] children = mChildren; 4739 final int count = mChildrenCount; 4740 for (int i = 0; i < count; i++) { 4741 children[i].jumpDrawablesToCurrentState(); 4742 } 4743 } 4744 4745 @Override 4746 protected int[] onCreateDrawableState(int extraSpace) { 4747 if ((mGroupFlags & FLAG_ADD_STATES_FROM_CHILDREN) == 0) { 4748 return super.onCreateDrawableState(extraSpace); 4749 } 4750 4751 int need = 0; 4752 int n = getChildCount(); 4753 for (int i = 0; i < n; i++) { 4754 int[] childState = getChildAt(i).getDrawableState(); 4755 4756 if (childState != null) { 4757 need += childState.length; 4758 } 4759 } 4760 4761 int[] state = super.onCreateDrawableState(extraSpace + need); 4762 4763 for (int i = 0; i < n; i++) { 4764 int[] childState = getChildAt(i).getDrawableState(); 4765 4766 if (childState != null) { 4767 state = mergeDrawableStates(state, childState); 4768 } 4769 } 4770 4771 return state; 4772 } 4773 4774 /** 4775 * Sets whether this ViewGroup's drawable states also include 4776 * its children's drawable states. This is used, for example, to 4777 * make a group appear to be focused when its child EditText or button 4778 * is focused. 4779 */ 4780 public void setAddStatesFromChildren(boolean addsStates) { 4781 if (addsStates) { 4782 mGroupFlags |= FLAG_ADD_STATES_FROM_CHILDREN; 4783 } else { 4784 mGroupFlags &= ~FLAG_ADD_STATES_FROM_CHILDREN; 4785 } 4786 4787 refreshDrawableState(); 4788 } 4789 4790 /** 4791 * Returns whether this ViewGroup's drawable states also include 4792 * its children's drawable states. This is used, for example, to 4793 * make a group appear to be focused when its child EditText or button 4794 * is focused. 4795 */ 4796 public boolean addStatesFromChildren() { 4797 return (mGroupFlags & FLAG_ADD_STATES_FROM_CHILDREN) != 0; 4798 } 4799 4800 /** 4801 * If {link #addStatesFromChildren} is true, refreshes this group's 4802 * drawable state (to include the states from its children). 4803 */ 4804 public void childDrawableStateChanged(View child) { 4805 if ((mGroupFlags & FLAG_ADD_STATES_FROM_CHILDREN) != 0) { 4806 refreshDrawableState(); 4807 } 4808 } 4809 4810 /** 4811 * Specifies the animation listener to which layout animation events must 4812 * be sent. Only 4813 * {@link android.view.animation.Animation.AnimationListener#onAnimationStart(Animation)} 4814 * and 4815 * {@link android.view.animation.Animation.AnimationListener#onAnimationEnd(Animation)} 4816 * are invoked. 4817 * 4818 * @param animationListener the layout animation listener 4819 */ 4820 public void setLayoutAnimationListener(Animation.AnimationListener animationListener) { 4821 mAnimationListener = animationListener; 4822 } 4823 4824 /** 4825 * This method is called by LayoutTransition when there are 'changing' animations that need 4826 * to start after the layout/setup phase. The request is forwarded to the ViewAncestor, who 4827 * starts all pending transitions prior to the drawing phase in the current traversal. 4828 * 4829 * @param transition The LayoutTransition to be started on the next traversal. 4830 * 4831 * @hide 4832 */ 4833 public void requestTransitionStart(LayoutTransition transition) { 4834 ViewRootImpl viewAncestor = getViewRootImpl(); 4835 if (viewAncestor != null) { 4836 viewAncestor.requestTransitionStart(transition); 4837 } 4838 } 4839 4840 @Override 4841 protected void resetResolvedLayoutDirection() { 4842 super.resetResolvedLayoutDirection(); 4843 4844 // Take care of resetting the children resolution too 4845 final int count = getChildCount(); 4846 for (int i = 0; i < count; i++) { 4847 final View child = getChildAt(i); 4848 if (child.getLayoutDirection() == LAYOUT_DIRECTION_INHERIT) { 4849 child.resetResolvedLayoutDirection(); 4850 } 4851 } 4852 } 4853 4854 @Override 4855 protected void resetResolvedTextDirection() { 4856 super.resetResolvedTextDirection(); 4857 4858 // Take care of resetting the children resolution too 4859 final int count = getChildCount(); 4860 for (int i = 0; i < count; i++) { 4861 final View child = getChildAt(i); 4862 if (child.getTextDirection() == TEXT_DIRECTION_INHERIT) { 4863 child.resetResolvedTextDirection(); 4864 } 4865 } 4866 } 4867 4868 /** 4869 * Return true if the pressed state should be delayed for children or descendants of this 4870 * ViewGroup. Generally, this should be done for containers that can scroll, such as a List. 4871 * This prevents the pressed state from appearing when the user is actually trying to scroll 4872 * the content. 4873 * 4874 * The default implementation returns true for compatibility reasons. Subclasses that do 4875 * not scroll should generally override this method and return false. 4876 */ 4877 public boolean shouldDelayChildPressedState() { 4878 return true; 4879 } 4880 4881 /** 4882 * LayoutParams are used by views to tell their parents how they want to be 4883 * laid out. See 4884 * {@link android.R.styleable#ViewGroup_Layout ViewGroup Layout Attributes} 4885 * for a list of all child view attributes that this class supports. 4886 * 4887 * <p> 4888 * The base LayoutParams class just describes how big the view wants to be 4889 * for both width and height. For each dimension, it can specify one of: 4890 * <ul> 4891 * <li>FILL_PARENT (renamed MATCH_PARENT in API Level 8 and higher), which 4892 * means that the view wants to be as big as its parent (minus padding) 4893 * <li> WRAP_CONTENT, which means that the view wants to be just big enough 4894 * to enclose its content (plus padding) 4895 * <li> an exact number 4896 * </ul> 4897 * There are subclasses of LayoutParams for different subclasses of 4898 * ViewGroup. For example, AbsoluteLayout has its own subclass of 4899 * LayoutParams which adds an X and Y value.</p> 4900 * 4901 * <div class="special reference"> 4902 * <h3>Developer Guides</h3> 4903 * <p>For more information about creating user interface layouts, read the 4904 * <a href="{@docRoot}guide/topics/ui/declaring-layout.html">XML Layouts</a> developer 4905 * guide.</p></div> 4906 * 4907 * @attr ref android.R.styleable#ViewGroup_Layout_layout_height 4908 * @attr ref android.R.styleable#ViewGroup_Layout_layout_width 4909 */ 4910 public static class LayoutParams { 4911 /** 4912 * Special value for the height or width requested by a View. 4913 * FILL_PARENT means that the view wants to be as big as its parent, 4914 * minus the parent's padding, if any. This value is deprecated 4915 * starting in API Level 8 and replaced by {@link #MATCH_PARENT}. 4916 */ 4917 @SuppressWarnings({"UnusedDeclaration"}) 4918 @Deprecated 4919 public static final int FILL_PARENT = -1; 4920 4921 /** 4922 * Special value for the height or width requested by a View. 4923 * MATCH_PARENT means that the view wants to be as big as its parent, 4924 * minus the parent's padding, if any. Introduced in API Level 8. 4925 */ 4926 public static final int MATCH_PARENT = -1; 4927 4928 /** 4929 * Special value for the height or width requested by a View. 4930 * WRAP_CONTENT means that the view wants to be just large enough to fit 4931 * its own internal content, taking its own padding into account. 4932 */ 4933 public static final int WRAP_CONTENT = -2; 4934 4935 /** 4936 * Information about how wide the view wants to be. Can be one of the 4937 * constants FILL_PARENT (replaced by MATCH_PARENT , 4938 * in API Level 8) or WRAP_CONTENT. or an exact size. 4939 */ 4940 @ViewDebug.ExportedProperty(category = "layout", mapping = { 4941 @ViewDebug.IntToString(from = MATCH_PARENT, to = "MATCH_PARENT"), 4942 @ViewDebug.IntToString(from = WRAP_CONTENT, to = "WRAP_CONTENT") 4943 }) 4944 public int width; 4945 4946 /** 4947 * Information about how tall the view wants to be. Can be one of the 4948 * constants FILL_PARENT (replaced by MATCH_PARENT , 4949 * in API Level 8) or WRAP_CONTENT. or an exact size. 4950 */ 4951 @ViewDebug.ExportedProperty(category = "layout", mapping = { 4952 @ViewDebug.IntToString(from = MATCH_PARENT, to = "MATCH_PARENT"), 4953 @ViewDebug.IntToString(from = WRAP_CONTENT, to = "WRAP_CONTENT") 4954 }) 4955 public int height; 4956 4957 /** 4958 * Used to animate layouts. 4959 */ 4960 public LayoutAnimationController.AnimationParameters layoutAnimationParameters; 4961 4962 /** 4963 * Creates a new set of layout parameters. The values are extracted from 4964 * the supplied attributes set and context. The XML attributes mapped 4965 * to this set of layout parameters are: 4966 * 4967 * <ul> 4968 * <li><code>layout_width</code>: the width, either an exact value, 4969 * {@link #WRAP_CONTENT}, or {@link #FILL_PARENT} (replaced by 4970 * {@link #MATCH_PARENT} in API Level 8)</li> 4971 * <li><code>layout_height</code>: the height, either an exact value, 4972 * {@link #WRAP_CONTENT}, or {@link #FILL_PARENT} (replaced by 4973 * {@link #MATCH_PARENT} in API Level 8)</li> 4974 * </ul> 4975 * 4976 * @param c the application environment 4977 * @param attrs the set of attributes from which to extract the layout 4978 * parameters' values 4979 */ 4980 public LayoutParams(Context c, AttributeSet attrs) { 4981 TypedArray a = c.obtainStyledAttributes(attrs, R.styleable.ViewGroup_Layout); 4982 setBaseAttributes(a, 4983 R.styleable.ViewGroup_Layout_layout_width, 4984 R.styleable.ViewGroup_Layout_layout_height); 4985 a.recycle(); 4986 } 4987 4988 /** 4989 * Creates a new set of layout parameters with the specified width 4990 * and height. 4991 * 4992 * @param width the width, either {@link #WRAP_CONTENT}, 4993 * {@link #FILL_PARENT} (replaced by {@link #MATCH_PARENT} in 4994 * API Level 8), or a fixed size in pixels 4995 * @param height the height, either {@link #WRAP_CONTENT}, 4996 * {@link #FILL_PARENT} (replaced by {@link #MATCH_PARENT} in 4997 * API Level 8), or a fixed size in pixels 4998 */ 4999 public LayoutParams(int width, int height) { 5000 this.width = width; 5001 this.height = height; 5002 } 5003 5004 /** 5005 * Copy constructor. Clones the width and height values of the source. 5006 * 5007 * @param source The layout params to copy from. 5008 */ 5009 public LayoutParams(LayoutParams source) { 5010 this.width = source.width; 5011 this.height = source.height; 5012 } 5013 5014 /** 5015 * Used internally by MarginLayoutParams. 5016 * @hide 5017 */ 5018 LayoutParams() { 5019 } 5020 5021 /** 5022 * Extracts the layout parameters from the supplied attributes. 5023 * 5024 * @param a the style attributes to extract the parameters from 5025 * @param widthAttr the identifier of the width attribute 5026 * @param heightAttr the identifier of the height attribute 5027 */ 5028 protected void setBaseAttributes(TypedArray a, int widthAttr, int heightAttr) { 5029 width = a.getLayoutDimension(widthAttr, "layout_width"); 5030 height = a.getLayoutDimension(heightAttr, "layout_height"); 5031 } 5032 5033 /** 5034 * Resolve layout parameters depending on the layout direction. Subclasses that care about 5035 * layoutDirection changes should override this method. The default implementation does 5036 * nothing. 5037 * 5038 * @param layoutDirection the direction of the layout 5039 * 5040 * {@link View#LAYOUT_DIRECTION_LTR} 5041 * {@link View#LAYOUT_DIRECTION_RTL} 5042 * 5043 * @hide 5044 */ 5045 protected void resolveWithDirection(int layoutDirection) { 5046 } 5047 5048 /** 5049 * Returns a String representation of this set of layout parameters. 5050 * 5051 * @param output the String to prepend to the internal representation 5052 * @return a String with the following format: output + 5053 * "ViewGroup.LayoutParams={ width=WIDTH, height=HEIGHT }" 5054 * 5055 * @hide 5056 */ 5057 public String debug(String output) { 5058 return output + "ViewGroup.LayoutParams={ width=" 5059 + sizeToString(width) + ", height=" + sizeToString(height) + " }"; 5060 } 5061 5062 /** 5063 * Converts the specified size to a readable String. 5064 * 5065 * @param size the size to convert 5066 * @return a String instance representing the supplied size 5067 * 5068 * @hide 5069 */ 5070 protected static String sizeToString(int size) { 5071 if (size == WRAP_CONTENT) { 5072 return "wrap-content"; 5073 } 5074 if (size == MATCH_PARENT) { 5075 return "match-parent"; 5076 } 5077 return String.valueOf(size); 5078 } 5079 } 5080 5081 /** 5082 * Per-child layout information for layouts that support margins. 5083 * See 5084 * {@link android.R.styleable#ViewGroup_MarginLayout ViewGroup Margin Layout Attributes} 5085 * for a list of all child view attributes that this class supports. 5086 */ 5087 public static class MarginLayoutParams extends ViewGroup.LayoutParams { 5088 /** 5089 * The left margin in pixels of the child. Whenever this value is changed, a call to 5090 * {@link android.view.View#requestLayout()} needs to be done. 5091 */ 5092 @ViewDebug.ExportedProperty(category = "layout") 5093 public int leftMargin; 5094 5095 /** 5096 * The top margin in pixels of the child. Whenever this value is changed, a call to 5097 * {@link android.view.View#requestLayout()} needs to be done. 5098 */ 5099 @ViewDebug.ExportedProperty(category = "layout") 5100 public int topMargin; 5101 5102 /** 5103 * The right margin in pixels of the child. Whenever this value is changed, a call to 5104 * {@link android.view.View#requestLayout()} needs to be done. 5105 */ 5106 @ViewDebug.ExportedProperty(category = "layout") 5107 public int rightMargin; 5108 5109 /** 5110 * The bottom margin in pixels of the child. Whenever this value is changed, a call to 5111 * {@link android.view.View#requestLayout()} needs to be done. 5112 */ 5113 @ViewDebug.ExportedProperty(category = "layout") 5114 public int bottomMargin; 5115 5116 /** 5117 * The start margin in pixels of the child. 5118 * 5119 * @hide 5120 * 5121 */ 5122 @ViewDebug.ExportedProperty(category = "layout") 5123 protected int startMargin = DEFAULT_RELATIVE; 5124 5125 /** 5126 * The end margin in pixels of the child. 5127 * 5128 * @hide 5129 */ 5130 @ViewDebug.ExportedProperty(category = "layout") 5131 protected int endMargin = DEFAULT_RELATIVE; 5132 5133 /** 5134 * The default start and end margin. 5135 */ 5136 static private final int DEFAULT_RELATIVE = Integer.MIN_VALUE; 5137 5138 /** 5139 * Creates a new set of layout parameters. The values are extracted from 5140 * the supplied attributes set and context. 5141 * 5142 * @param c the application environment 5143 * @param attrs the set of attributes from which to extract the layout 5144 * parameters' values 5145 */ 5146 public MarginLayoutParams(Context c, AttributeSet attrs) { 5147 super(); 5148 5149 TypedArray a = c.obtainStyledAttributes(attrs, R.styleable.ViewGroup_MarginLayout); 5150 setBaseAttributes(a, 5151 R.styleable.ViewGroup_MarginLayout_layout_width, 5152 R.styleable.ViewGroup_MarginLayout_layout_height); 5153 5154 int margin = a.getDimensionPixelSize( 5155 com.android.internal.R.styleable.ViewGroup_MarginLayout_layout_margin, -1); 5156 if (margin >= 0) { 5157 leftMargin = margin; 5158 topMargin = margin; 5159 rightMargin= margin; 5160 bottomMargin = margin; 5161 } else { 5162 leftMargin = a.getDimensionPixelSize( 5163 R.styleable.ViewGroup_MarginLayout_layout_marginLeft, 0); 5164 topMargin = a.getDimensionPixelSize( 5165 R.styleable.ViewGroup_MarginLayout_layout_marginTop, 0); 5166 rightMargin = a.getDimensionPixelSize( 5167 R.styleable.ViewGroup_MarginLayout_layout_marginRight, 0); 5168 bottomMargin = a.getDimensionPixelSize( 5169 R.styleable.ViewGroup_MarginLayout_layout_marginBottom, 0); 5170 startMargin = a.getDimensionPixelSize( 5171 R.styleable.ViewGroup_MarginLayout_layout_marginStart, DEFAULT_RELATIVE); 5172 endMargin = a.getDimensionPixelSize( 5173 R.styleable.ViewGroup_MarginLayout_layout_marginEnd, DEFAULT_RELATIVE); 5174 } 5175 5176 a.recycle(); 5177 } 5178 5179 /** 5180 * {@inheritDoc} 5181 */ 5182 public MarginLayoutParams(int width, int height) { 5183 super(width, height); 5184 } 5185 5186 /** 5187 * Copy constructor. Clones the width, height and margin values of the source. 5188 * 5189 * @param source The layout params to copy from. 5190 */ 5191 public MarginLayoutParams(MarginLayoutParams source) { 5192 this.width = source.width; 5193 this.height = source.height; 5194 5195 this.leftMargin = source.leftMargin; 5196 this.topMargin = source.topMargin; 5197 this.rightMargin = source.rightMargin; 5198 this.bottomMargin = source.bottomMargin; 5199 this.startMargin = source.startMargin; 5200 this.endMargin = source.endMargin; 5201 } 5202 5203 /** 5204 * {@inheritDoc} 5205 */ 5206 public MarginLayoutParams(LayoutParams source) { 5207 super(source); 5208 } 5209 5210 /** 5211 * Sets the margins, in pixels. A call to {@link android.view.View#requestLayout()} needs 5212 * to be done so that the new margins are taken into account. Left and right margins may be 5213 * overriden by {@link android.view.View#requestLayout()} depending on layout direction. 5214 * 5215 * @param left the left margin size 5216 * @param top the top margin size 5217 * @param right the right margin size 5218 * @param bottom the bottom margin size 5219 * 5220 * @attr ref android.R.styleable#ViewGroup_MarginLayout_layout_marginLeft 5221 * @attr ref android.R.styleable#ViewGroup_MarginLayout_layout_marginTop 5222 * @attr ref android.R.styleable#ViewGroup_MarginLayout_layout_marginRight 5223 * @attr ref android.R.styleable#ViewGroup_MarginLayout_layout_marginBottom 5224 */ 5225 public void setMargins(int left, int top, int right, int bottom) { 5226 leftMargin = left; 5227 topMargin = top; 5228 rightMargin = right; 5229 bottomMargin = bottom; 5230 } 5231 5232 /** 5233 * Sets the relative margins, in pixels. A call to {@link android.view.View#requestLayout()} 5234 * needs to be done so that the new relative margins are taken into account. Left and right 5235 * margins may be overriden by {@link android.view.View#requestLayout()} depending on layout 5236 * direction. 5237 * 5238 * @param start the start margin size 5239 * @param top the top margin size 5240 * @param end the right margin size 5241 * @param bottom the bottom margin size 5242 * 5243 * @attr ref android.R.styleable#ViewGroup_MarginLayout_layout_marginStart 5244 * @attr ref android.R.styleable#ViewGroup_MarginLayout_layout_marginTop 5245 * @attr ref android.R.styleable#ViewGroup_MarginLayout_layout_marginEnd 5246 * @attr ref android.R.styleable#ViewGroup_MarginLayout_layout_marginBottom 5247 * 5248 * @hide 5249 */ 5250 public void setMarginsRelative(int start, int top, int end, int bottom) { 5251 startMargin = start; 5252 topMargin = top; 5253 endMargin = end; 5254 bottomMargin = bottom; 5255 } 5256 5257 /** 5258 * Returns the start margin in pixels. 5259 * 5260 * @attr ref android.R.styleable#ViewGroup_MarginLayout_layout_marginStart 5261 * 5262 * @return the start margin in pixels. 5263 * 5264 * @hide 5265 */ 5266 public int getMarginStart() { 5267 return startMargin; 5268 } 5269 5270 /** 5271 * Returns the end margin in pixels. 5272 * 5273 * @attr ref android.R.styleable#ViewGroup_MarginLayout_layout_marginEnd 5274 * 5275 * @return the end margin in pixels. 5276 * 5277 * @hide 5278 */ 5279 public int getMarginEnd() { 5280 return endMargin; 5281 } 5282 5283 /** 5284 * Check if margins are relative. 5285 * 5286 * @attr ref android.R.styleable#ViewGroup_MarginLayout_layout_marginStart 5287 * @attr ref android.R.styleable#ViewGroup_MarginLayout_layout_marginEnd 5288 * 5289 * @return true if either marginStart or marginEnd has been set 5290 * 5291 * @hide 5292 */ 5293 public boolean isMarginRelative() { 5294 return (startMargin != DEFAULT_RELATIVE) || (endMargin != DEFAULT_RELATIVE); 5295 } 5296 5297 /** 5298 * This will be called by {@link android.view.View#requestLayout()}. Left and Right margins 5299 * maybe overriden depending on layout direction. 5300 * 5301 * @hide 5302 */ 5303 @Override 5304 protected void resolveWithDirection(int layoutDirection) { 5305 switch(layoutDirection) { 5306 case View.LAYOUT_DIRECTION_RTL: 5307 leftMargin = (endMargin > DEFAULT_RELATIVE) ? endMargin : leftMargin; 5308 rightMargin = (startMargin > DEFAULT_RELATIVE) ? startMargin : rightMargin; 5309 break; 5310 case View.LAYOUT_DIRECTION_LTR: 5311 default: 5312 leftMargin = (startMargin > DEFAULT_RELATIVE) ? startMargin : leftMargin; 5313 rightMargin = (endMargin > DEFAULT_RELATIVE) ? endMargin : rightMargin; 5314 break; 5315 } 5316 } 5317 } 5318 5319 /* Describes a touched view and the ids of the pointers that it has captured. 5320 * 5321 * This code assumes that pointer ids are always in the range 0..31 such that 5322 * it can use a bitfield to track which pointer ids are present. 5323 * As it happens, the lower layers of the input dispatch pipeline also use the 5324 * same trick so the assumption should be safe here... 5325 */ 5326 private static final class TouchTarget { 5327 private static final int MAX_RECYCLED = 32; 5328 private static final Object sRecycleLock = new Object(); 5329 private static TouchTarget sRecycleBin; 5330 private static int sRecycledCount; 5331 5332 public static final int ALL_POINTER_IDS = -1; // all ones 5333 5334 // The touched child view. 5335 public View child; 5336 5337 // The combined bit mask of pointer ids for all pointers captured by the target. 5338 public int pointerIdBits; 5339 5340 // The next target in the target list. 5341 public TouchTarget next; 5342 5343 private TouchTarget() { 5344 } 5345 5346 public static TouchTarget obtain(View child, int pointerIdBits) { 5347 final TouchTarget target; 5348 synchronized (sRecycleLock) { 5349 if (sRecycleBin == null) { 5350 target = new TouchTarget(); 5351 } else { 5352 target = sRecycleBin; 5353 sRecycleBin = target.next; 5354 sRecycledCount--; 5355 target.next = null; 5356 } 5357 } 5358 target.child = child; 5359 target.pointerIdBits = pointerIdBits; 5360 return target; 5361 } 5362 5363 public void recycle() { 5364 synchronized (sRecycleLock) { 5365 if (sRecycledCount < MAX_RECYCLED) { 5366 next = sRecycleBin; 5367 sRecycleBin = this; 5368 sRecycledCount += 1; 5369 } else { 5370 next = null; 5371 } 5372 child = null; 5373 } 5374 } 5375 } 5376 5377 /* Describes a hovered view. */ 5378 private static final class HoverTarget { 5379 private static final int MAX_RECYCLED = 32; 5380 private static final Object sRecycleLock = new Object(); 5381 private static HoverTarget sRecycleBin; 5382 private static int sRecycledCount; 5383 5384 // The hovered child view. 5385 public View child; 5386 5387 // The next target in the target list. 5388 public HoverTarget next; 5389 5390 private HoverTarget() { 5391 } 5392 5393 public static HoverTarget obtain(View child) { 5394 final HoverTarget target; 5395 synchronized (sRecycleLock) { 5396 if (sRecycleBin == null) { 5397 target = new HoverTarget(); 5398 } else { 5399 target = sRecycleBin; 5400 sRecycleBin = target.next; 5401 sRecycledCount--; 5402 target.next = null; 5403 } 5404 } 5405 target.child = child; 5406 return target; 5407 } 5408 5409 public void recycle() { 5410 synchronized (sRecycleLock) { 5411 if (sRecycledCount < MAX_RECYCLED) { 5412 next = sRecycleBin; 5413 sRecycleBin = this; 5414 sRecycledCount += 1; 5415 } else { 5416 next = null; 5417 } 5418 child = null; 5419 } 5420 } 5421 } 5422} 5423