ViewGroup.java revision 02739a8eecce26783350041da332f8daf6691e25
1/* 2 * Copyright (C) 2006 The Android Open Source Project 3 * 4 * Licensed under the Apache License, Version 2.0 (the "License"); 5 * you may not use this file except in compliance with the License. 6 * You may obtain a copy of the License at 7 * 8 * http://www.apache.org/licenses/LICENSE-2.0 9 * 10 * Unless required by applicable law or agreed to in writing, software 11 * distributed under the License is distributed on an "AS IS" BASIS, 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 13 * See the License for the specific language governing permissions and 14 * limitations under the License. 15 */ 16 17package android.view; 18 19import android.animation.LayoutTransition; 20import android.content.Context; 21import android.content.res.Configuration; 22import android.content.res.TypedArray; 23import android.graphics.Bitmap; 24import android.graphics.Canvas; 25import android.graphics.Matrix; 26import android.graphics.Paint; 27import android.graphics.PointF; 28import android.graphics.Rect; 29import android.graphics.RectF; 30import android.graphics.Region; 31import android.os.Build; 32import android.os.Parcelable; 33import android.os.SystemClock; 34import android.util.AttributeSet; 35import android.util.Log; 36import android.util.SparseArray; 37import android.view.accessibility.AccessibilityEvent; 38import android.view.animation.AlphaAnimation; 39import android.view.animation.Animation; 40import android.view.animation.AnimationUtils; 41import android.view.animation.LayoutAnimationController; 42import android.view.animation.Transformation; 43import com.android.internal.R; 44import com.android.internal.util.Predicate; 45 46import java.util.ArrayList; 47import java.util.HashSet; 48 49/** 50 * <p> 51 * A <code>ViewGroup</code> is a special view that can contain other views 52 * (called children.) The view group is the base class for layouts and views 53 * containers. This class also defines the 54 * {@link android.view.ViewGroup.LayoutParams} class which serves as the base 55 * class for layouts parameters. 56 * </p> 57 * 58 * <p> 59 * Also see {@link LayoutParams} for layout attributes. 60 * </p> 61 * 62 * @attr ref android.R.styleable#ViewGroup_clipChildren 63 * @attr ref android.R.styleable#ViewGroup_clipToPadding 64 * @attr ref android.R.styleable#ViewGroup_layoutAnimation 65 * @attr ref android.R.styleable#ViewGroup_animationCache 66 * @attr ref android.R.styleable#ViewGroup_persistentDrawingCache 67 * @attr ref android.R.styleable#ViewGroup_alwaysDrawnWithCache 68 * @attr ref android.R.styleable#ViewGroup_addStatesFromChildren 69 * @attr ref android.R.styleable#ViewGroup_descendantFocusability 70 * @attr ref android.R.styleable#ViewGroup_animateLayoutChanges 71 */ 72public abstract class ViewGroup extends View implements ViewParent, ViewManager { 73 74 private static final boolean DBG = false; 75 76 /** 77 * Views which have been hidden or removed which need to be animated on 78 * their way out. 79 * This field should be made private, so it is hidden from the SDK. 80 * {@hide} 81 */ 82 protected ArrayList<View> mDisappearingChildren; 83 84 /** 85 * Listener used to propagate events indicating when children are added 86 * and/or removed from a view group. 87 * This field should be made private, so it is hidden from the SDK. 88 * {@hide} 89 */ 90 protected OnHierarchyChangeListener mOnHierarchyChangeListener; 91 92 // The view contained within this ViewGroup that has or contains focus. 93 private View mFocused; 94 95 /** 96 * A Transformation used when drawing children, to 97 * apply on the child being drawn. 98 */ 99 private final Transformation mChildTransformation = new Transformation(); 100 101 /** 102 * Used to track the current invalidation region. 103 */ 104 private RectF mInvalidateRegion; 105 106 /** 107 * A Transformation used to calculate a correct 108 * invalidation area when the application is autoscaled. 109 */ 110 private Transformation mInvalidationTransformation; 111 112 // View currently under an ongoing drag 113 private View mCurrentDragView; 114 115 // Metadata about the ongoing drag 116 private DragEvent mCurrentDrag; 117 private HashSet<View> mDragNotifiedChildren; 118 119 // Does this group have a child that can accept the current drag payload? 120 private boolean mChildAcceptsDrag; 121 122 // Used during drag dispatch 123 private final PointF mLocalPoint = new PointF(); 124 125 // Layout animation 126 private LayoutAnimationController mLayoutAnimationController; 127 private Animation.AnimationListener mAnimationListener; 128 129 // First touch target in the linked list of touch targets. 130 private TouchTarget mFirstTouchTarget; 131 132 // For debugging only. You can see these in hierarchyviewer. 133 @SuppressWarnings({"FieldCanBeLocal", "UnusedDeclaration"}) 134 @ViewDebug.ExportedProperty(category = "events") 135 private long mLastTouchDownTime; 136 @ViewDebug.ExportedProperty(category = "events") 137 private int mLastTouchDownIndex = -1; 138 @SuppressWarnings({"FieldCanBeLocal", "UnusedDeclaration"}) 139 @ViewDebug.ExportedProperty(category = "events") 140 private float mLastTouchDownX; 141 @SuppressWarnings({"FieldCanBeLocal", "UnusedDeclaration"}) 142 @ViewDebug.ExportedProperty(category = "events") 143 private float mLastTouchDownY; 144 145 // Child which last received ACTION_HOVER_ENTER and ACTION_HOVER_MOVE. 146 private View mHoveredChild; 147 148 /** 149 * Internal flags. 150 * 151 * This field should be made private, so it is hidden from the SDK. 152 * {@hide} 153 */ 154 protected int mGroupFlags; 155 156 // When set, ViewGroup invalidates only the child's rectangle 157 // Set by default 158 private static final int FLAG_CLIP_CHILDREN = 0x1; 159 160 // When set, ViewGroup excludes the padding area from the invalidate rectangle 161 // Set by default 162 private static final int FLAG_CLIP_TO_PADDING = 0x2; 163 164 // When set, dispatchDraw() will invoke invalidate(); this is set by drawChild() when 165 // a child needs to be invalidated and FLAG_OPTIMIZE_INVALIDATE is set 166 private static final int FLAG_INVALIDATE_REQUIRED = 0x4; 167 168 // When set, dispatchDraw() will run the layout animation and unset the flag 169 private static final int FLAG_RUN_ANIMATION = 0x8; 170 171 // When set, there is either no layout animation on the ViewGroup or the layout 172 // animation is over 173 // Set by default 174 private static final int FLAG_ANIMATION_DONE = 0x10; 175 176 // If set, this ViewGroup has padding; if unset there is no padding and we don't need 177 // to clip it, even if FLAG_CLIP_TO_PADDING is set 178 private static final int FLAG_PADDING_NOT_NULL = 0x20; 179 180 // When set, this ViewGroup caches its children in a Bitmap before starting a layout animation 181 // Set by default 182 private static final int FLAG_ANIMATION_CACHE = 0x40; 183 184 // When set, this ViewGroup converts calls to invalidate(Rect) to invalidate() during a 185 // layout animation; this avoid clobbering the hierarchy 186 // Automatically set when the layout animation starts, depending on the animation's 187 // characteristics 188 private static final int FLAG_OPTIMIZE_INVALIDATE = 0x80; 189 190 // When set, the next call to drawChild() will clear mChildTransformation's matrix 191 private static final int FLAG_CLEAR_TRANSFORMATION = 0x100; 192 193 // When set, this ViewGroup invokes mAnimationListener.onAnimationEnd() and removes 194 // the children's Bitmap caches if necessary 195 // This flag is set when the layout animation is over (after FLAG_ANIMATION_DONE is set) 196 private static final int FLAG_NOTIFY_ANIMATION_LISTENER = 0x200; 197 198 /** 199 * When set, the drawing method will call {@link #getChildDrawingOrder(int, int)} 200 * to get the index of the child to draw for that iteration. 201 * 202 * @hide 203 */ 204 protected static final int FLAG_USE_CHILD_DRAWING_ORDER = 0x400; 205 206 /** 207 * When set, this ViewGroup supports static transformations on children; this causes 208 * {@link #getChildStaticTransformation(View, android.view.animation.Transformation)} to be 209 * invoked when a child is drawn. 210 * 211 * Any subclass overriding 212 * {@link #getChildStaticTransformation(View, android.view.animation.Transformation)} should 213 * set this flags in {@link #mGroupFlags}. 214 * 215 * {@hide} 216 */ 217 protected static final int FLAG_SUPPORT_STATIC_TRANSFORMATIONS = 0x800; 218 219 // When the previous drawChild() invocation used an alpha value that was lower than 220 // 1.0 and set it in mCachePaint 221 private static final int FLAG_ALPHA_LOWER_THAN_ONE = 0x1000; 222 223 /** 224 * When set, this ViewGroup's drawable states also include those 225 * of its children. 226 */ 227 private static final int FLAG_ADD_STATES_FROM_CHILDREN = 0x2000; 228 229 /** 230 * When set, this ViewGroup tries to always draw its children using their drawing cache. 231 */ 232 private static final int FLAG_ALWAYS_DRAWN_WITH_CACHE = 0x4000; 233 234 /** 235 * When set, and if FLAG_ALWAYS_DRAWN_WITH_CACHE is not set, this ViewGroup will try to 236 * draw its children with their drawing cache. 237 */ 238 private static final int FLAG_CHILDREN_DRAWN_WITH_CACHE = 0x8000; 239 240 /** 241 * When set, this group will go through its list of children to notify them of 242 * any drawable state change. 243 */ 244 private static final int FLAG_NOTIFY_CHILDREN_ON_DRAWABLE_STATE_CHANGE = 0x10000; 245 246 private static final int FLAG_MASK_FOCUSABILITY = 0x60000; 247 248 /** 249 * This view will get focus before any of its descendants. 250 */ 251 public static final int FOCUS_BEFORE_DESCENDANTS = 0x20000; 252 253 /** 254 * This view will get focus only if none of its descendants want it. 255 */ 256 public static final int FOCUS_AFTER_DESCENDANTS = 0x40000; 257 258 /** 259 * This view will block any of its descendants from getting focus, even 260 * if they are focusable. 261 */ 262 public static final int FOCUS_BLOCK_DESCENDANTS = 0x60000; 263 264 /** 265 * Used to map between enum in attrubutes and flag values. 266 */ 267 private static final int[] DESCENDANT_FOCUSABILITY_FLAGS = 268 {FOCUS_BEFORE_DESCENDANTS, FOCUS_AFTER_DESCENDANTS, 269 FOCUS_BLOCK_DESCENDANTS}; 270 271 /** 272 * When set, this ViewGroup should not intercept touch events. 273 * {@hide} 274 */ 275 protected static final int FLAG_DISALLOW_INTERCEPT = 0x80000; 276 277 /** 278 * When set, this ViewGroup will split MotionEvents to multiple child Views when appropriate. 279 */ 280 private static final int FLAG_SPLIT_MOTION_EVENTS = 0x200000; 281 282 /** 283 * Indicates which types of drawing caches are to be kept in memory. 284 * This field should be made private, so it is hidden from the SDK. 285 * {@hide} 286 */ 287 protected int mPersistentDrawingCache; 288 289 /** 290 * Used to indicate that no drawing cache should be kept in memory. 291 */ 292 public static final int PERSISTENT_NO_CACHE = 0x0; 293 294 /** 295 * Used to indicate that the animation drawing cache should be kept in memory. 296 */ 297 public static final int PERSISTENT_ANIMATION_CACHE = 0x1; 298 299 /** 300 * Used to indicate that the scrolling drawing cache should be kept in memory. 301 */ 302 public static final int PERSISTENT_SCROLLING_CACHE = 0x2; 303 304 /** 305 * Used to indicate that all drawing caches should be kept in memory. 306 */ 307 public static final int PERSISTENT_ALL_CACHES = 0x3; 308 309 /** 310 * We clip to padding when FLAG_CLIP_TO_PADDING and FLAG_PADDING_NOT_NULL 311 * are set at the same time. 312 */ 313 protected static final int CLIP_TO_PADDING_MASK = FLAG_CLIP_TO_PADDING | FLAG_PADDING_NOT_NULL; 314 315 // Index of the child's left position in the mLocation array 316 private static final int CHILD_LEFT_INDEX = 0; 317 // Index of the child's top position in the mLocation array 318 private static final int CHILD_TOP_INDEX = 1; 319 320 // Child views of this ViewGroup 321 private View[] mChildren; 322 // Number of valid children in the mChildren array, the rest should be null or not 323 // considered as children 324 325 private boolean mLayoutSuppressed = false; 326 327 private int mChildrenCount; 328 329 private static final int ARRAY_INITIAL_CAPACITY = 12; 330 private static final int ARRAY_CAPACITY_INCREMENT = 12; 331 332 // Used to draw cached views 333 private final Paint mCachePaint = new Paint(); 334 335 // Used to animate add/remove changes in layout 336 private LayoutTransition mTransition; 337 338 // The set of views that are currently being transitioned. This list is used to track views 339 // being removed that should not actually be removed from the parent yet because they are 340 // being animated. 341 private ArrayList<View> mTransitioningViews; 342 343 // List of children changing visibility. This is used to potentially keep rendering 344 // views during a transition when they otherwise would have become gone/invisible 345 private ArrayList<View> mVisibilityChangingChildren; 346 347 // Indicates whether this container will use its children layers to draw 348 @ViewDebug.ExportedProperty(category = "drawing") 349 private boolean mDrawLayers = true; 350 351 public ViewGroup(Context context) { 352 super(context); 353 initViewGroup(); 354 } 355 356 public ViewGroup(Context context, AttributeSet attrs) { 357 super(context, attrs); 358 initViewGroup(); 359 initFromAttributes(context, attrs); 360 } 361 362 public ViewGroup(Context context, AttributeSet attrs, int defStyle) { 363 super(context, attrs, defStyle); 364 initViewGroup(); 365 initFromAttributes(context, attrs); 366 } 367 368 private void initViewGroup() { 369 // ViewGroup doesn't draw by default 370 setFlags(WILL_NOT_DRAW, DRAW_MASK); 371 mGroupFlags |= FLAG_CLIP_CHILDREN; 372 mGroupFlags |= FLAG_CLIP_TO_PADDING; 373 mGroupFlags |= FLAG_ANIMATION_DONE; 374 mGroupFlags |= FLAG_ANIMATION_CACHE; 375 mGroupFlags |= FLAG_ALWAYS_DRAWN_WITH_CACHE; 376 377 if (mContext.getApplicationInfo().targetSdkVersion >= Build.VERSION_CODES.HONEYCOMB) { 378 mGroupFlags |= FLAG_SPLIT_MOTION_EVENTS; 379 } 380 381 setDescendantFocusability(FOCUS_BEFORE_DESCENDANTS); 382 383 mChildren = new View[ARRAY_INITIAL_CAPACITY]; 384 mChildrenCount = 0; 385 386 mCachePaint.setDither(false); 387 388 mPersistentDrawingCache = PERSISTENT_SCROLLING_CACHE; 389 } 390 391 private void initFromAttributes(Context context, AttributeSet attrs) { 392 TypedArray a = context.obtainStyledAttributes(attrs, 393 R.styleable.ViewGroup); 394 395 final int N = a.getIndexCount(); 396 for (int i = 0; i < N; i++) { 397 int attr = a.getIndex(i); 398 switch (attr) { 399 case R.styleable.ViewGroup_clipChildren: 400 setClipChildren(a.getBoolean(attr, true)); 401 break; 402 case R.styleable.ViewGroup_clipToPadding: 403 setClipToPadding(a.getBoolean(attr, true)); 404 break; 405 case R.styleable.ViewGroup_animationCache: 406 setAnimationCacheEnabled(a.getBoolean(attr, true)); 407 break; 408 case R.styleable.ViewGroup_persistentDrawingCache: 409 setPersistentDrawingCache(a.getInt(attr, PERSISTENT_SCROLLING_CACHE)); 410 break; 411 case R.styleable.ViewGroup_addStatesFromChildren: 412 setAddStatesFromChildren(a.getBoolean(attr, false)); 413 break; 414 case R.styleable.ViewGroup_alwaysDrawnWithCache: 415 setAlwaysDrawnWithCacheEnabled(a.getBoolean(attr, true)); 416 break; 417 case R.styleable.ViewGroup_layoutAnimation: 418 int id = a.getResourceId(attr, -1); 419 if (id > 0) { 420 setLayoutAnimation(AnimationUtils.loadLayoutAnimation(mContext, id)); 421 } 422 break; 423 case R.styleable.ViewGroup_descendantFocusability: 424 setDescendantFocusability(DESCENDANT_FOCUSABILITY_FLAGS[a.getInt(attr, 0)]); 425 break; 426 case R.styleable.ViewGroup_splitMotionEvents: 427 setMotionEventSplittingEnabled(a.getBoolean(attr, false)); 428 break; 429 case R.styleable.ViewGroup_animateLayoutChanges: 430 boolean animateLayoutChanges = a.getBoolean(attr, false); 431 if (animateLayoutChanges) { 432 setLayoutTransition(new LayoutTransition()); 433 } 434 break; 435 } 436 } 437 438 a.recycle(); 439 } 440 441 /** 442 * Gets the descendant focusability of this view group. The descendant 443 * focusability defines the relationship between this view group and its 444 * descendants when looking for a view to take focus in 445 * {@link #requestFocus(int, android.graphics.Rect)}. 446 * 447 * @return one of {@link #FOCUS_BEFORE_DESCENDANTS}, {@link #FOCUS_AFTER_DESCENDANTS}, 448 * {@link #FOCUS_BLOCK_DESCENDANTS}. 449 */ 450 @ViewDebug.ExportedProperty(category = "focus", mapping = { 451 @ViewDebug.IntToString(from = FOCUS_BEFORE_DESCENDANTS, to = "FOCUS_BEFORE_DESCENDANTS"), 452 @ViewDebug.IntToString(from = FOCUS_AFTER_DESCENDANTS, to = "FOCUS_AFTER_DESCENDANTS"), 453 @ViewDebug.IntToString(from = FOCUS_BLOCK_DESCENDANTS, to = "FOCUS_BLOCK_DESCENDANTS") 454 }) 455 public int getDescendantFocusability() { 456 return mGroupFlags & FLAG_MASK_FOCUSABILITY; 457 } 458 459 /** 460 * Set the descendant focusability of this view group. This defines the relationship 461 * between this view group and its descendants when looking for a view to 462 * take focus in {@link #requestFocus(int, android.graphics.Rect)}. 463 * 464 * @param focusability one of {@link #FOCUS_BEFORE_DESCENDANTS}, {@link #FOCUS_AFTER_DESCENDANTS}, 465 * {@link #FOCUS_BLOCK_DESCENDANTS}. 466 */ 467 public void setDescendantFocusability(int focusability) { 468 switch (focusability) { 469 case FOCUS_BEFORE_DESCENDANTS: 470 case FOCUS_AFTER_DESCENDANTS: 471 case FOCUS_BLOCK_DESCENDANTS: 472 break; 473 default: 474 throw new IllegalArgumentException("must be one of FOCUS_BEFORE_DESCENDANTS, " 475 + "FOCUS_AFTER_DESCENDANTS, FOCUS_BLOCK_DESCENDANTS"); 476 } 477 mGroupFlags &= ~FLAG_MASK_FOCUSABILITY; 478 mGroupFlags |= (focusability & FLAG_MASK_FOCUSABILITY); 479 } 480 481 /** 482 * {@inheritDoc} 483 */ 484 @Override 485 void handleFocusGainInternal(int direction, Rect previouslyFocusedRect) { 486 if (mFocused != null) { 487 mFocused.unFocus(); 488 mFocused = null; 489 } 490 super.handleFocusGainInternal(direction, previouslyFocusedRect); 491 } 492 493 /** 494 * {@inheritDoc} 495 */ 496 public void requestChildFocus(View child, View focused) { 497 if (DBG) { 498 System.out.println(this + " requestChildFocus()"); 499 } 500 if (getDescendantFocusability() == FOCUS_BLOCK_DESCENDANTS) { 501 return; 502 } 503 504 // Unfocus us, if necessary 505 super.unFocus(); 506 507 // We had a previous notion of who had focus. Clear it. 508 if (mFocused != child) { 509 if (mFocused != null) { 510 mFocused.unFocus(); 511 } 512 513 mFocused = child; 514 } 515 if (mParent != null) { 516 mParent.requestChildFocus(this, focused); 517 } 518 } 519 520 /** 521 * {@inheritDoc} 522 */ 523 public void focusableViewAvailable(View v) { 524 if (mParent != null 525 // shortcut: don't report a new focusable view if we block our descendants from 526 // getting focus 527 && (getDescendantFocusability() != FOCUS_BLOCK_DESCENDANTS) 528 // shortcut: don't report a new focusable view if we already are focused 529 // (and we don't prefer our descendants) 530 // 531 // note: knowing that mFocused is non-null is not a good enough reason 532 // to break the traversal since in that case we'd actually have to find 533 // the focused view and make sure it wasn't FOCUS_AFTER_DESCENDANTS and 534 // an ancestor of v; this will get checked for at ViewAncestor 535 && !(isFocused() && getDescendantFocusability() != FOCUS_AFTER_DESCENDANTS)) { 536 mParent.focusableViewAvailable(v); 537 } 538 } 539 540 /** 541 * {@inheritDoc} 542 */ 543 public boolean showContextMenuForChild(View originalView) { 544 return mParent != null && mParent.showContextMenuForChild(originalView); 545 } 546 547 /** 548 * {@inheritDoc} 549 */ 550 public ActionMode startActionModeForChild(View originalView, ActionMode.Callback callback) { 551 return mParent != null ? mParent.startActionModeForChild(originalView, callback) : null; 552 } 553 554 /** 555 * Find the nearest view in the specified direction that wants to take 556 * focus. 557 * 558 * @param focused The view that currently has focus 559 * @param direction One of FOCUS_UP, FOCUS_DOWN, FOCUS_LEFT, and 560 * FOCUS_RIGHT, or 0 for not applicable. 561 */ 562 public View focusSearch(View focused, int direction) { 563 if (isRootNamespace()) { 564 // root namespace means we should consider ourselves the top of the 565 // tree for focus searching; otherwise we could be focus searching 566 // into other tabs. see LocalActivityManager and TabHost for more info 567 return FocusFinder.getInstance().findNextFocus(this, focused, direction); 568 } else if (mParent != null) { 569 return mParent.focusSearch(focused, direction); 570 } 571 return null; 572 } 573 574 /** 575 * {@inheritDoc} 576 */ 577 public boolean requestChildRectangleOnScreen(View child, Rect rectangle, boolean immediate) { 578 return false; 579 } 580 581 /** 582 * {@inheritDoc} 583 */ 584 public boolean requestSendAccessibilityEvent(View child, AccessibilityEvent event) { 585 ViewParent parent = getParent(); 586 if (parent == null) { 587 return false; 588 } 589 final boolean propagate = onRequestSendAccessibilityEvent(child, event); 590 //noinspection SimplifiableIfStatement 591 if (!propagate) { 592 return false; 593 } 594 return parent.requestSendAccessibilityEvent(this, event); 595 } 596 597 /** 598 * Called when a child has requested sending an {@link AccessibilityEvent} and 599 * gives an opportunity to its parent to augment the event. 600 * 601 * @param child The child which requests sending the event. 602 * @param event The event to be sent. 603 * @return True if the event should be sent. 604 * 605 * @see #requestSendAccessibilityEvent(View, AccessibilityEvent) 606 */ 607 public boolean onRequestSendAccessibilityEvent(View child, AccessibilityEvent event) { 608 return true; 609 } 610 611 /** 612 * {@inheritDoc} 613 */ 614 @Override 615 public boolean dispatchUnhandledMove(View focused, int direction) { 616 return mFocused != null && 617 mFocused.dispatchUnhandledMove(focused, direction); 618 } 619 620 /** 621 * {@inheritDoc} 622 */ 623 public void clearChildFocus(View child) { 624 if (DBG) { 625 System.out.println(this + " clearChildFocus()"); 626 } 627 628 mFocused = null; 629 if (mParent != null) { 630 mParent.clearChildFocus(this); 631 } 632 } 633 634 /** 635 * {@inheritDoc} 636 */ 637 @Override 638 public void clearFocus() { 639 super.clearFocus(); 640 641 // clear any child focus if it exists 642 if (mFocused != null) { 643 mFocused.clearFocus(); 644 } 645 } 646 647 /** 648 * {@inheritDoc} 649 */ 650 @Override 651 void unFocus() { 652 if (DBG) { 653 System.out.println(this + " unFocus()"); 654 } 655 656 super.unFocus(); 657 if (mFocused != null) { 658 mFocused.unFocus(); 659 } 660 mFocused = null; 661 } 662 663 /** 664 * Returns the focused child of this view, if any. The child may have focus 665 * or contain focus. 666 * 667 * @return the focused child or null. 668 */ 669 public View getFocusedChild() { 670 return mFocused; 671 } 672 673 /** 674 * Returns true if this view has or contains focus 675 * 676 * @return true if this view has or contains focus 677 */ 678 @Override 679 public boolean hasFocus() { 680 return (mPrivateFlags & FOCUSED) != 0 || mFocused != null; 681 } 682 683 /* 684 * (non-Javadoc) 685 * 686 * @see android.view.View#findFocus() 687 */ 688 @Override 689 public View findFocus() { 690 if (DBG) { 691 System.out.println("Find focus in " + this + ": flags=" 692 + isFocused() + ", child=" + mFocused); 693 } 694 695 if (isFocused()) { 696 return this; 697 } 698 699 if (mFocused != null) { 700 return mFocused.findFocus(); 701 } 702 return null; 703 } 704 705 /** 706 * {@inheritDoc} 707 */ 708 @Override 709 public boolean hasFocusable() { 710 if ((mViewFlags & VISIBILITY_MASK) != VISIBLE) { 711 return false; 712 } 713 714 if (isFocusable()) { 715 return true; 716 } 717 718 final int descendantFocusability = getDescendantFocusability(); 719 if (descendantFocusability != FOCUS_BLOCK_DESCENDANTS) { 720 final int count = mChildrenCount; 721 final View[] children = mChildren; 722 723 for (int i = 0; i < count; i++) { 724 final View child = children[i]; 725 if (child.hasFocusable()) { 726 return true; 727 } 728 } 729 } 730 731 return false; 732 } 733 734 /** 735 * {@inheritDoc} 736 */ 737 @Override 738 public void addFocusables(ArrayList<View> views, int direction) { 739 addFocusables(views, direction, FOCUSABLES_TOUCH_MODE); 740 } 741 742 /** 743 * {@inheritDoc} 744 */ 745 @Override 746 public void addFocusables(ArrayList<View> views, int direction, int focusableMode) { 747 final int focusableCount = views.size(); 748 749 final int descendantFocusability = getDescendantFocusability(); 750 751 if (descendantFocusability != FOCUS_BLOCK_DESCENDANTS) { 752 final int count = mChildrenCount; 753 final View[] children = mChildren; 754 755 for (int i = 0; i < count; i++) { 756 final View child = children[i]; 757 if ((child.mViewFlags & VISIBILITY_MASK) == VISIBLE) { 758 child.addFocusables(views, direction, focusableMode); 759 } 760 } 761 } 762 763 // we add ourselves (if focusable) in all cases except for when we are 764 // FOCUS_AFTER_DESCENDANTS and there are some descendants focusable. this is 765 // to avoid the focus search finding layouts when a more precise search 766 // among the focusable children would be more interesting. 767 if ( 768 descendantFocusability != FOCUS_AFTER_DESCENDANTS || 769 // No focusable descendants 770 (focusableCount == views.size())) { 771 super.addFocusables(views, direction, focusableMode); 772 } 773 } 774 775 /** 776 * {@inheritDoc} 777 */ 778 @Override 779 public void dispatchWindowFocusChanged(boolean hasFocus) { 780 super.dispatchWindowFocusChanged(hasFocus); 781 final int count = mChildrenCount; 782 final View[] children = mChildren; 783 for (int i = 0; i < count; i++) { 784 children[i].dispatchWindowFocusChanged(hasFocus); 785 } 786 } 787 788 /** 789 * {@inheritDoc} 790 */ 791 @Override 792 public void addTouchables(ArrayList<View> views) { 793 super.addTouchables(views); 794 795 final int count = mChildrenCount; 796 final View[] children = mChildren; 797 798 for (int i = 0; i < count; i++) { 799 final View child = children[i]; 800 if ((child.mViewFlags & VISIBILITY_MASK) == VISIBLE) { 801 child.addTouchables(views); 802 } 803 } 804 } 805 806 /** 807 * {@inheritDoc} 808 */ 809 @Override 810 public void dispatchDisplayHint(int hint) { 811 super.dispatchDisplayHint(hint); 812 final int count = mChildrenCount; 813 final View[] children = mChildren; 814 for (int i = 0; i < count; i++) { 815 children[i].dispatchDisplayHint(hint); 816 } 817 } 818 819 /** 820 * @hide 821 * @param child 822 * @param visibility 823 */ 824 void onChildVisibilityChanged(View child, int visibility) { 825 if (mTransition != null) { 826 if (visibility == VISIBLE) { 827 mTransition.showChild(this, child); 828 } else { 829 mTransition.hideChild(this, child); 830 } 831 if (visibility != VISIBLE) { 832 // Only track this on disappearing views - appearing views are already visible 833 // and don't need special handling during drawChild() 834 if (mVisibilityChangingChildren == null) { 835 mVisibilityChangingChildren = new ArrayList<View>(); 836 } 837 mVisibilityChangingChildren.add(child); 838 if (mTransitioningViews != null && mTransitioningViews.contains(child)) { 839 addDisappearingView(child); 840 } 841 } 842 } 843 844 // in all cases, for drags 845 if (mCurrentDrag != null) { 846 if (visibility == VISIBLE) { 847 notifyChildOfDrag(child); 848 } 849 } 850 } 851 852 /** 853 * {@inheritDoc} 854 */ 855 @Override 856 protected void dispatchVisibilityChanged(View changedView, int visibility) { 857 super.dispatchVisibilityChanged(changedView, visibility); 858 final int count = mChildrenCount; 859 final View[] children = mChildren; 860 for (int i = 0; i < count; i++) { 861 children[i].dispatchVisibilityChanged(changedView, visibility); 862 } 863 } 864 865 /** 866 * {@inheritDoc} 867 */ 868 @Override 869 public void dispatchWindowVisibilityChanged(int visibility) { 870 super.dispatchWindowVisibilityChanged(visibility); 871 final int count = mChildrenCount; 872 final View[] children = mChildren; 873 for (int i = 0; i < count; i++) { 874 children[i].dispatchWindowVisibilityChanged(visibility); 875 } 876 } 877 878 /** 879 * {@inheritDoc} 880 */ 881 @Override 882 public void dispatchConfigurationChanged(Configuration newConfig) { 883 super.dispatchConfigurationChanged(newConfig); 884 final int count = mChildrenCount; 885 final View[] children = mChildren; 886 for (int i = 0; i < count; i++) { 887 children[i].dispatchConfigurationChanged(newConfig); 888 } 889 } 890 891 /** 892 * {@inheritDoc} 893 */ 894 public void recomputeViewAttributes(View child) { 895 if (mAttachInfo != null && !mAttachInfo.mRecomputeGlobalAttributes) { 896 ViewParent parent = mParent; 897 if (parent != null) parent.recomputeViewAttributes(this); 898 } 899 } 900 901 @Override 902 void dispatchCollectViewAttributes(int visibility) { 903 visibility |= mViewFlags&VISIBILITY_MASK; 904 super.dispatchCollectViewAttributes(visibility); 905 final int count = mChildrenCount; 906 final View[] children = mChildren; 907 for (int i = 0; i < count; i++) { 908 children[i].dispatchCollectViewAttributes(visibility); 909 } 910 } 911 912 /** 913 * {@inheritDoc} 914 */ 915 public void bringChildToFront(View child) { 916 int index = indexOfChild(child); 917 if (index >= 0) { 918 removeFromArray(index); 919 addInArray(child, mChildrenCount); 920 child.mParent = this; 921 } 922 } 923 924 /** 925 * {@inheritDoc} 926 * 927 * !!! TODO: write real docs 928 */ 929 @Override 930 public boolean dispatchDragEvent(DragEvent event) { 931 boolean retval = false; 932 final float tx = event.mX; 933 final float ty = event.mY; 934 935 ViewAncestor root = getViewAncestor(); 936 937 // Dispatch down the view hierarchy 938 switch (event.mAction) { 939 case DragEvent.ACTION_DRAG_STARTED: { 940 // clear state to recalculate which views we drag over 941 mCurrentDragView = null; 942 943 // Set up our tracking of drag-started notifications 944 mCurrentDrag = DragEvent.obtain(event); 945 if (mDragNotifiedChildren == null) { 946 mDragNotifiedChildren = new HashSet<View>(); 947 } else { 948 mDragNotifiedChildren.clear(); 949 } 950 951 // Now dispatch down to our children, caching the responses 952 mChildAcceptsDrag = false; 953 final int count = mChildrenCount; 954 final View[] children = mChildren; 955 for (int i = 0; i < count; i++) { 956 final View child = children[i]; 957 child.mPrivateFlags2 &= ~View.DRAG_MASK; 958 if (child.getVisibility() == VISIBLE) { 959 final boolean handled = notifyChildOfDrag(children[i]); 960 if (handled) { 961 mChildAcceptsDrag = true; 962 } 963 } 964 } 965 966 // Return HANDLED if one of our children can accept the drag 967 if (mChildAcceptsDrag) { 968 retval = true; 969 } 970 } break; 971 972 case DragEvent.ACTION_DRAG_ENDED: { 973 // Release the bookkeeping now that the drag lifecycle has ended 974 if (mDragNotifiedChildren != null) { 975 for (View child : mDragNotifiedChildren) { 976 // If a child was notified about an ongoing drag, it's told that it's over 977 child.dispatchDragEvent(event); 978 child.mPrivateFlags2 &= ~View.DRAG_MASK; 979 child.refreshDrawableState(); 980 } 981 982 mDragNotifiedChildren.clear(); 983 mCurrentDrag.recycle(); 984 mCurrentDrag = null; 985 } 986 987 // We consider drag-ended to have been handled if one of our children 988 // had offered to handle the drag. 989 if (mChildAcceptsDrag) { 990 retval = true; 991 } 992 } break; 993 994 case DragEvent.ACTION_DRAG_LOCATION: { 995 // Find the [possibly new] drag target 996 final View target = findFrontmostDroppableChildAt(event.mX, event.mY, mLocalPoint); 997 998 // If we've changed apparent drag target, tell the view root which view 999 // we're over now [for purposes of the eventual drag-recipient-changed 1000 // notifications to the framework] and tell the new target that the drag 1001 // has entered its bounds. The root will see setDragFocus() calls all 1002 // the way down to the final leaf view that is handling the LOCATION event 1003 // before reporting the new potential recipient to the framework. 1004 if (mCurrentDragView != target) { 1005 root.setDragFocus(target); 1006 1007 final int action = event.mAction; 1008 // If we've dragged off of a child view, send it the EXITED message 1009 if (mCurrentDragView != null) { 1010 final View view = mCurrentDragView; 1011 event.mAction = DragEvent.ACTION_DRAG_EXITED; 1012 view.dispatchDragEvent(event); 1013 view.mPrivateFlags2 &= ~View.DRAG_HOVERED; 1014 view.refreshDrawableState(); 1015 } 1016 mCurrentDragView = target; 1017 1018 // If we've dragged over a new child view, send it the ENTERED message 1019 if (target != null) { 1020 event.mAction = DragEvent.ACTION_DRAG_ENTERED; 1021 target.dispatchDragEvent(event); 1022 target.mPrivateFlags2 |= View.DRAG_HOVERED; 1023 target.refreshDrawableState(); 1024 } 1025 event.mAction = action; // restore the event's original state 1026 } 1027 1028 // Dispatch the actual drag location notice, localized into its coordinates 1029 if (target != null) { 1030 event.mX = mLocalPoint.x; 1031 event.mY = mLocalPoint.y; 1032 1033 retval = target.dispatchDragEvent(event); 1034 1035 event.mX = tx; 1036 event.mY = ty; 1037 } 1038 } break; 1039 1040 /* Entered / exited dispatch 1041 * 1042 * DRAG_ENTERED is not dispatched downwards from ViewGroup. The reason for this is 1043 * that we're about to get the corresponding LOCATION event, which we will use to 1044 * determine which of our children is the new target; at that point we will 1045 * push a DRAG_ENTERED down to the new target child [which may itself be a ViewGroup]. 1046 * 1047 * DRAG_EXITED *is* dispatched all the way down immediately: once we know the 1048 * drag has left this ViewGroup, we know by definition that every contained subview 1049 * is also no longer under the drag point. 1050 */ 1051 1052 case DragEvent.ACTION_DRAG_EXITED: { 1053 if (mCurrentDragView != null) { 1054 final View view = mCurrentDragView; 1055 view.dispatchDragEvent(event); 1056 view.mPrivateFlags2 &= ~View.DRAG_HOVERED; 1057 view.refreshDrawableState(); 1058 1059 mCurrentDragView = null; 1060 } 1061 } break; 1062 1063 case DragEvent.ACTION_DROP: { 1064 if (ViewDebug.DEBUG_DRAG) Log.d(View.VIEW_LOG_TAG, "Drop event: " + event); 1065 View target = findFrontmostDroppableChildAt(event.mX, event.mY, mLocalPoint); 1066 if (target != null) { 1067 if (ViewDebug.DEBUG_DRAG) Log.d(View.VIEW_LOG_TAG, " dispatch drop to " + target); 1068 event.mX = mLocalPoint.x; 1069 event.mY = mLocalPoint.y; 1070 retval = target.dispatchDragEvent(event); 1071 event.mX = tx; 1072 event.mY = ty; 1073 } else { 1074 if (ViewDebug.DEBUG_DRAG) { 1075 Log.d(View.VIEW_LOG_TAG, " not dropped on an accepting view"); 1076 } 1077 } 1078 } break; 1079 } 1080 1081 // If none of our children could handle the event, try here 1082 if (!retval) { 1083 // Call up to the View implementation that dispatches to installed listeners 1084 retval = super.dispatchDragEvent(event); 1085 } 1086 return retval; 1087 } 1088 1089 // Find the frontmost child view that lies under the given point, and calculate 1090 // the position within its own local coordinate system. 1091 View findFrontmostDroppableChildAt(float x, float y, PointF outLocalPoint) { 1092 final int count = mChildrenCount; 1093 final View[] children = mChildren; 1094 for (int i = count - 1; i >= 0; i--) { 1095 final View child = children[i]; 1096 if (!child.canAcceptDrag()) { 1097 continue; 1098 } 1099 1100 if (isTransformedTouchPointInView(x, y, child, outLocalPoint)) { 1101 return child; 1102 } 1103 } 1104 return null; 1105 } 1106 1107 boolean notifyChildOfDrag(View child) { 1108 if (ViewDebug.DEBUG_DRAG) { 1109 Log.d(View.VIEW_LOG_TAG, "Sending drag-started to view: " + child); 1110 } 1111 1112 boolean canAccept = false; 1113 if (! mDragNotifiedChildren.contains(child)) { 1114 mDragNotifiedChildren.add(child); 1115 canAccept = child.dispatchDragEvent(mCurrentDrag); 1116 if (canAccept && !child.canAcceptDrag()) { 1117 child.mPrivateFlags2 |= View.DRAG_CAN_ACCEPT; 1118 child.refreshDrawableState(); 1119 } 1120 } 1121 return canAccept; 1122 } 1123 1124 @Override 1125 public void dispatchSystemUiVisibilityChanged(int visible) { 1126 super.dispatchSystemUiVisibilityChanged(visible); 1127 1128 final int count = mChildrenCount; 1129 final View[] children = mChildren; 1130 for (int i=0; i <count; i++) { 1131 final View child = children[i]; 1132 child.dispatchSystemUiVisibilityChanged(visible); 1133 } 1134 } 1135 1136 /** 1137 * {@inheritDoc} 1138 */ 1139 @Override 1140 public boolean dispatchKeyEventPreIme(KeyEvent event) { 1141 if ((mPrivateFlags & (FOCUSED | HAS_BOUNDS)) == (FOCUSED | HAS_BOUNDS)) { 1142 return super.dispatchKeyEventPreIme(event); 1143 } else if (mFocused != null && (mFocused.mPrivateFlags & HAS_BOUNDS) == HAS_BOUNDS) { 1144 return mFocused.dispatchKeyEventPreIme(event); 1145 } 1146 return false; 1147 } 1148 1149 /** 1150 * {@inheritDoc} 1151 */ 1152 @Override 1153 public boolean dispatchKeyEvent(KeyEvent event) { 1154 if (mInputEventConsistencyVerifier != null) { 1155 mInputEventConsistencyVerifier.onKeyEvent(event, 1); 1156 } 1157 1158 if ((mPrivateFlags & (FOCUSED | HAS_BOUNDS)) == (FOCUSED | HAS_BOUNDS)) { 1159 if (super.dispatchKeyEvent(event)) { 1160 return true; 1161 } 1162 } else if (mFocused != null && (mFocused.mPrivateFlags & HAS_BOUNDS) == HAS_BOUNDS) { 1163 if (mFocused.dispatchKeyEvent(event)) { 1164 return true; 1165 } 1166 } 1167 1168 if (mInputEventConsistencyVerifier != null) { 1169 mInputEventConsistencyVerifier.onUnhandledEvent(event, 1); 1170 } 1171 return false; 1172 } 1173 1174 /** 1175 * {@inheritDoc} 1176 */ 1177 @Override 1178 public boolean dispatchKeyShortcutEvent(KeyEvent event) { 1179 if ((mPrivateFlags & (FOCUSED | HAS_BOUNDS)) == (FOCUSED | HAS_BOUNDS)) { 1180 return super.dispatchKeyShortcutEvent(event); 1181 } else if (mFocused != null && (mFocused.mPrivateFlags & HAS_BOUNDS) == HAS_BOUNDS) { 1182 return mFocused.dispatchKeyShortcutEvent(event); 1183 } 1184 return false; 1185 } 1186 1187 /** 1188 * {@inheritDoc} 1189 */ 1190 @Override 1191 public boolean dispatchTrackballEvent(MotionEvent event) { 1192 if (mInputEventConsistencyVerifier != null) { 1193 mInputEventConsistencyVerifier.onTrackballEvent(event, 1); 1194 } 1195 1196 if ((mPrivateFlags & (FOCUSED | HAS_BOUNDS)) == (FOCUSED | HAS_BOUNDS)) { 1197 if (super.dispatchTrackballEvent(event)) { 1198 return true; 1199 } 1200 } else if (mFocused != null && (mFocused.mPrivateFlags & HAS_BOUNDS) == HAS_BOUNDS) { 1201 if (mFocused.dispatchTrackballEvent(event)) { 1202 return true; 1203 } 1204 } 1205 1206 if (mInputEventConsistencyVerifier != null) { 1207 mInputEventConsistencyVerifier.onUnhandledEvent(event, 1); 1208 } 1209 return false; 1210 } 1211 1212 /** @hide */ 1213 @Override 1214 protected boolean dispatchHoverEvent(MotionEvent event) { 1215 // Send the hover enter or hover move event to the view group first. 1216 // If it handles the event then a hovered child should receive hover exit. 1217 boolean handled = false; 1218 final boolean interceptHover; 1219 final int action = event.getAction(); 1220 if (action == MotionEvent.ACTION_HOVER_EXIT) { 1221 interceptHover = true; 1222 } else { 1223 handled = super.dispatchHoverEvent(event); 1224 interceptHover = handled; 1225 } 1226 1227 // Send successive hover events to the hovered child as long as the pointer 1228 // remains within the child's bounds. 1229 MotionEvent eventNoHistory = event; 1230 if (mHoveredChild != null) { 1231 final float x = event.getX(); 1232 final float y = event.getY(); 1233 1234 if (interceptHover 1235 || !isTransformedTouchPointInView(x, y, mHoveredChild, null)) { 1236 // Pointer exited the child. 1237 // Send it a hover exit with only the most recent coordinates. We could 1238 // try to find the exact point in history when the pointer left the view 1239 // but it is not worth the effort. 1240 eventNoHistory = obtainMotionEventNoHistoryOrSelf(eventNoHistory); 1241 eventNoHistory.setAction(MotionEvent.ACTION_HOVER_EXIT); 1242 handled |= dispatchTransformedGenericPointerEvent(eventNoHistory, mHoveredChild); 1243 eventNoHistory.setAction(action); 1244 mHoveredChild = null; 1245 } else { 1246 // Pointer is still within the child. 1247 //noinspection ConstantConditions 1248 handled |= dispatchTransformedGenericPointerEvent(event, mHoveredChild); 1249 } 1250 } 1251 1252 // Find a new hovered child if needed. 1253 if (!interceptHover && mHoveredChild == null 1254 && (action == MotionEvent.ACTION_HOVER_ENTER 1255 || action == MotionEvent.ACTION_HOVER_MOVE)) { 1256 final int childrenCount = mChildrenCount; 1257 if (childrenCount != 0) { 1258 final View[] children = mChildren; 1259 final float x = event.getX(); 1260 final float y = event.getY(); 1261 1262 for (int i = childrenCount - 1; i >= 0; i--) { 1263 final View child = children[i]; 1264 if (!canViewReceivePointerEvents(child) 1265 || !isTransformedTouchPointInView(x, y, child, null)) { 1266 continue; 1267 } 1268 1269 // Found the hovered child. 1270 mHoveredChild = child; 1271 if (action == MotionEvent.ACTION_HOVER_MOVE) { 1272 // Pointer was moving within the view group and entered the child. 1273 // Send it a hover enter and hover move with only the most recent 1274 // coordinates. We could try to find the exact point in history when 1275 // the pointer entered the view but it is not worth the effort. 1276 eventNoHistory = obtainMotionEventNoHistoryOrSelf(eventNoHistory); 1277 eventNoHistory.setAction(MotionEvent.ACTION_HOVER_ENTER); 1278 handled |= dispatchTransformedGenericPointerEvent(eventNoHistory, child); 1279 eventNoHistory.setAction(action); 1280 1281 handled |= dispatchTransformedGenericPointerEvent(eventNoHistory, child); 1282 } else { /* must be ACTION_HOVER_ENTER */ 1283 // Pointer entered the child. 1284 handled |= dispatchTransformedGenericPointerEvent(event, child); 1285 } 1286 break; 1287 } 1288 } 1289 } 1290 1291 // Recycle the copy of the event that we made. 1292 if (eventNoHistory != event) { 1293 eventNoHistory.recycle(); 1294 } 1295 1296 // Send hover exit to the view group. If there was a child, we will already have 1297 // sent the hover exit to it. 1298 if (action == MotionEvent.ACTION_HOVER_EXIT) { 1299 handled |= super.dispatchHoverEvent(event); 1300 } 1301 1302 // Done. 1303 return handled; 1304 } 1305 1306 @Override 1307 public boolean onHoverEvent(MotionEvent event) { 1308 // Handle the event only if leaf. This guarantees that 1309 // the leafs (or any custom class that returns true from 1310 // this method) will get a change to process the hover. 1311 //noinspection SimplifiableIfStatement 1312 if (getChildCount() == 0) { 1313 return super.onHoverEvent(event); 1314 } 1315 return false; 1316 } 1317 1318 private static MotionEvent obtainMotionEventNoHistoryOrSelf(MotionEvent event) { 1319 if (event.getHistorySize() == 0) { 1320 return event; 1321 } 1322 return MotionEvent.obtainNoHistory(event); 1323 } 1324 1325 /** @hide */ 1326 @Override 1327 protected boolean dispatchGenericPointerEvent(MotionEvent event) { 1328 // Send the event to the child under the pointer. 1329 final int childrenCount = mChildrenCount; 1330 if (childrenCount != 0) { 1331 final View[] children = mChildren; 1332 final float x = event.getX(); 1333 final float y = event.getY(); 1334 1335 for (int i = childrenCount - 1; i >= 0; i--) { 1336 final View child = children[i]; 1337 if (!canViewReceivePointerEvents(child) 1338 || !isTransformedTouchPointInView(x, y, child, null)) { 1339 continue; 1340 } 1341 1342 if (dispatchTransformedGenericPointerEvent(event, child)) { 1343 return true; 1344 } 1345 } 1346 } 1347 1348 // No child handled the event. Send it to this view group. 1349 return super.dispatchGenericPointerEvent(event); 1350 } 1351 1352 /** @hide */ 1353 @Override 1354 protected boolean dispatchGenericFocusedEvent(MotionEvent event) { 1355 // Send the event to the focused child or to this view group if it has focus. 1356 if ((mPrivateFlags & (FOCUSED | HAS_BOUNDS)) == (FOCUSED | HAS_BOUNDS)) { 1357 return super.dispatchGenericFocusedEvent(event); 1358 } else if (mFocused != null && (mFocused.mPrivateFlags & HAS_BOUNDS) == HAS_BOUNDS) { 1359 return mFocused.dispatchGenericMotionEvent(event); 1360 } 1361 return false; 1362 } 1363 1364 /** 1365 * Dispatches a generic pointer event to a child, taking into account 1366 * transformations that apply to the child. 1367 * 1368 * @param event The event to send. 1369 * @param child The view to send the event to. 1370 * @return {@code true} if the child handled the event. 1371 */ 1372 private boolean dispatchTransformedGenericPointerEvent(MotionEvent event, View child) { 1373 final float offsetX = mScrollX - child.mLeft; 1374 final float offsetY = mScrollY - child.mTop; 1375 1376 boolean handled; 1377 if (!child.hasIdentityMatrix()) { 1378 MotionEvent transformedEvent = MotionEvent.obtain(event); 1379 transformedEvent.offsetLocation(offsetX, offsetY); 1380 transformedEvent.transform(child.getInverseMatrix()); 1381 handled = child.dispatchGenericMotionEvent(transformedEvent); 1382 transformedEvent.recycle(); 1383 } else { 1384 event.offsetLocation(offsetX, offsetY); 1385 handled = child.dispatchGenericMotionEvent(event); 1386 event.offsetLocation(-offsetX, -offsetY); 1387 } 1388 return handled; 1389 } 1390 1391 /** 1392 * {@inheritDoc} 1393 */ 1394 @Override 1395 public boolean dispatchTouchEvent(MotionEvent ev) { 1396 if (mInputEventConsistencyVerifier != null) { 1397 mInputEventConsistencyVerifier.onTouchEvent(ev, 1); 1398 } 1399 1400 boolean handled = false; 1401 if (onFilterTouchEventForSecurity(ev)) { 1402 final int action = ev.getAction(); 1403 final int actionMasked = action & MotionEvent.ACTION_MASK; 1404 1405 // Handle an initial down. 1406 if (actionMasked == MotionEvent.ACTION_DOWN) { 1407 // Throw away all previous state when starting a new touch gesture. 1408 // The framework may have dropped the up or cancel event for the previous gesture 1409 // due to an app switch, ANR, or some other state change. 1410 cancelAndClearTouchTargets(ev); 1411 resetTouchState(); 1412 } 1413 1414 // Check for interception. 1415 final boolean intercepted; 1416 if (actionMasked == MotionEvent.ACTION_DOWN 1417 || mFirstTouchTarget != null) { 1418 final boolean disallowIntercept = (mGroupFlags & FLAG_DISALLOW_INTERCEPT) != 0; 1419 if (!disallowIntercept) { 1420 intercepted = onInterceptTouchEvent(ev); 1421 ev.setAction(action); // restore action in case it was changed 1422 } else { 1423 intercepted = false; 1424 } 1425 } else { 1426 // There are no touch targets and this action is not an initial down 1427 // so this view group continues to intercept touches. 1428 intercepted = true; 1429 } 1430 1431 // Check for cancelation. 1432 final boolean canceled = resetCancelNextUpFlag(this) 1433 || actionMasked == MotionEvent.ACTION_CANCEL; 1434 1435 // Update list of touch targets for pointer down, if needed. 1436 final boolean split = (mGroupFlags & FLAG_SPLIT_MOTION_EVENTS) != 0; 1437 TouchTarget newTouchTarget = null; 1438 boolean alreadyDispatchedToNewTouchTarget = false; 1439 if (!canceled && !intercepted) { 1440 if (actionMasked == MotionEvent.ACTION_DOWN 1441 || (split && actionMasked == MotionEvent.ACTION_POINTER_DOWN) 1442 || actionMasked == MotionEvent.ACTION_HOVER_MOVE) { 1443 final int actionIndex = ev.getActionIndex(); // always 0 for down 1444 final int idBitsToAssign = split ? 1 << ev.getPointerId(actionIndex) 1445 : TouchTarget.ALL_POINTER_IDS; 1446 1447 // Clean up earlier touch targets for this pointer id in case they 1448 // have become out of sync. 1449 removePointersFromTouchTargets(idBitsToAssign); 1450 1451 final int childrenCount = mChildrenCount; 1452 if (childrenCount != 0) { 1453 // Find a child that can receive the event. 1454 // Scan children from front to back. 1455 final View[] children = mChildren; 1456 final float x = ev.getX(actionIndex); 1457 final float y = ev.getY(actionIndex); 1458 1459 for (int i = childrenCount - 1; i >= 0; i--) { 1460 final View child = children[i]; 1461 if (!canViewReceivePointerEvents(child) 1462 || !isTransformedTouchPointInView(x, y, child, null)) { 1463 continue; 1464 } 1465 1466 newTouchTarget = getTouchTarget(child); 1467 if (newTouchTarget != null) { 1468 // Child is already receiving touch within its bounds. 1469 // Give it the new pointer in addition to the ones it is handling. 1470 newTouchTarget.pointerIdBits |= idBitsToAssign; 1471 break; 1472 } 1473 1474 resetCancelNextUpFlag(child); 1475 if (dispatchTransformedTouchEvent(ev, false, child, idBitsToAssign)) { 1476 // Child wants to receive touch within its bounds. 1477 mLastTouchDownTime = ev.getDownTime(); 1478 mLastTouchDownIndex = i; 1479 mLastTouchDownX = ev.getX(); 1480 mLastTouchDownY = ev.getY(); 1481 newTouchTarget = addTouchTarget(child, idBitsToAssign); 1482 alreadyDispatchedToNewTouchTarget = true; 1483 break; 1484 } 1485 } 1486 } 1487 1488 if (newTouchTarget == null && mFirstTouchTarget != null) { 1489 // Did not find a child to receive the event. 1490 // Assign the pointer to the least recently added target. 1491 newTouchTarget = mFirstTouchTarget; 1492 while (newTouchTarget.next != null) { 1493 newTouchTarget = newTouchTarget.next; 1494 } 1495 newTouchTarget.pointerIdBits |= idBitsToAssign; 1496 } 1497 } 1498 } 1499 1500 // Dispatch to touch targets. 1501 if (mFirstTouchTarget == null) { 1502 // No touch targets so treat this as an ordinary view. 1503 handled = dispatchTransformedTouchEvent(ev, canceled, null, 1504 TouchTarget.ALL_POINTER_IDS); 1505 } else { 1506 // Dispatch to touch targets, excluding the new touch target if we already 1507 // dispatched to it. Cancel touch targets if necessary. 1508 TouchTarget predecessor = null; 1509 TouchTarget target = mFirstTouchTarget; 1510 while (target != null) { 1511 final TouchTarget next = target.next; 1512 if (alreadyDispatchedToNewTouchTarget && target == newTouchTarget) { 1513 handled = true; 1514 } else { 1515 final boolean cancelChild = resetCancelNextUpFlag(target.child) 1516 || intercepted; 1517 if (dispatchTransformedTouchEvent(ev, cancelChild, 1518 target.child, target.pointerIdBits)) { 1519 handled = true; 1520 } 1521 if (cancelChild) { 1522 if (predecessor == null) { 1523 mFirstTouchTarget = next; 1524 } else { 1525 predecessor.next = next; 1526 } 1527 target.recycle(); 1528 target = next; 1529 continue; 1530 } 1531 } 1532 predecessor = target; 1533 target = next; 1534 } 1535 } 1536 1537 // Update list of touch targets for pointer up or cancel, if needed. 1538 if (canceled 1539 || actionMasked == MotionEvent.ACTION_UP 1540 || actionMasked == MotionEvent.ACTION_HOVER_MOVE) { 1541 resetTouchState(); 1542 } else if (split && actionMasked == MotionEvent.ACTION_POINTER_UP) { 1543 final int actionIndex = ev.getActionIndex(); 1544 final int idBitsToRemove = 1 << ev.getPointerId(actionIndex); 1545 removePointersFromTouchTargets(idBitsToRemove); 1546 } 1547 } 1548 1549 if (!handled && mInputEventConsistencyVerifier != null) { 1550 mInputEventConsistencyVerifier.onUnhandledEvent(ev, 1); 1551 } 1552 return handled; 1553 } 1554 1555 /** 1556 * Resets all touch state in preparation for a new cycle. 1557 */ 1558 private void resetTouchState() { 1559 clearTouchTargets(); 1560 resetCancelNextUpFlag(this); 1561 mGroupFlags &= ~FLAG_DISALLOW_INTERCEPT; 1562 } 1563 1564 /** 1565 * Resets the cancel next up flag. 1566 * Returns true if the flag was previously set. 1567 */ 1568 private boolean resetCancelNextUpFlag(View view) { 1569 if ((view.mPrivateFlags & CANCEL_NEXT_UP_EVENT) != 0) { 1570 view.mPrivateFlags &= ~CANCEL_NEXT_UP_EVENT; 1571 return true; 1572 } 1573 return false; 1574 } 1575 1576 /** 1577 * Clears all touch targets. 1578 */ 1579 private void clearTouchTargets() { 1580 TouchTarget target = mFirstTouchTarget; 1581 if (target != null) { 1582 do { 1583 TouchTarget next = target.next; 1584 target.recycle(); 1585 target = next; 1586 } while (target != null); 1587 mFirstTouchTarget = null; 1588 } 1589 } 1590 1591 /** 1592 * Cancels and clears all touch targets. 1593 */ 1594 private void cancelAndClearTouchTargets(MotionEvent event) { 1595 if (mFirstTouchTarget != null) { 1596 boolean syntheticEvent = false; 1597 if (event == null) { 1598 final long now = SystemClock.uptimeMillis(); 1599 event = MotionEvent.obtain(now, now, 1600 MotionEvent.ACTION_CANCEL, 0.0f, 0.0f, 0); 1601 syntheticEvent = true; 1602 } 1603 1604 for (TouchTarget target = mFirstTouchTarget; target != null; target = target.next) { 1605 resetCancelNextUpFlag(target.child); 1606 dispatchTransformedTouchEvent(event, true, target.child, target.pointerIdBits); 1607 } 1608 clearTouchTargets(); 1609 1610 if (syntheticEvent) { 1611 event.recycle(); 1612 } 1613 } 1614 } 1615 1616 /** 1617 * Gets the touch target for specified child view. 1618 * Returns null if not found. 1619 */ 1620 private TouchTarget getTouchTarget(View child) { 1621 for (TouchTarget target = mFirstTouchTarget; target != null; target = target.next) { 1622 if (target.child == child) { 1623 return target; 1624 } 1625 } 1626 return null; 1627 } 1628 1629 /** 1630 * Adds a touch target for specified child to the beginning of the list. 1631 * Assumes the target child is not already present. 1632 */ 1633 private TouchTarget addTouchTarget(View child, int pointerIdBits) { 1634 TouchTarget target = TouchTarget.obtain(child, pointerIdBits); 1635 target.next = mFirstTouchTarget; 1636 mFirstTouchTarget = target; 1637 return target; 1638 } 1639 1640 /** 1641 * Removes the pointer ids from consideration. 1642 */ 1643 private void removePointersFromTouchTargets(int pointerIdBits) { 1644 TouchTarget predecessor = null; 1645 TouchTarget target = mFirstTouchTarget; 1646 while (target != null) { 1647 final TouchTarget next = target.next; 1648 if ((target.pointerIdBits & pointerIdBits) != 0) { 1649 target.pointerIdBits &= ~pointerIdBits; 1650 if (target.pointerIdBits == 0) { 1651 if (predecessor == null) { 1652 mFirstTouchTarget = next; 1653 } else { 1654 predecessor.next = next; 1655 } 1656 target.recycle(); 1657 target = next; 1658 continue; 1659 } 1660 } 1661 predecessor = target; 1662 target = next; 1663 } 1664 } 1665 1666 /** 1667 * Returns true if a child view can receive pointer events. 1668 * @hide 1669 */ 1670 private static boolean canViewReceivePointerEvents(View child) { 1671 return (child.mViewFlags & VISIBILITY_MASK) == VISIBLE 1672 || child.getAnimation() != null; 1673 } 1674 1675 /** 1676 * Returns true if a child view contains the specified point when transformed 1677 * into its coordinate space. 1678 * Child must not be null. 1679 * @hide 1680 */ 1681 protected boolean isTransformedTouchPointInView(float x, float y, View child, 1682 PointF outLocalPoint) { 1683 float localX = x + mScrollX - child.mLeft; 1684 float localY = y + mScrollY - child.mTop; 1685 if (! child.hasIdentityMatrix() && mAttachInfo != null) { 1686 final float[] localXY = mAttachInfo.mTmpTransformLocation; 1687 localXY[0] = localX; 1688 localXY[1] = localY; 1689 child.getInverseMatrix().mapPoints(localXY); 1690 localX = localXY[0]; 1691 localY = localXY[1]; 1692 } 1693 final boolean isInView = child.pointInView(localX, localY); 1694 if (isInView && outLocalPoint != null) { 1695 outLocalPoint.set(localX, localY); 1696 } 1697 return isInView; 1698 } 1699 1700 /** 1701 * Transforms a motion event into the coordinate space of a particular child view, 1702 * filters out irrelevant pointer ids, and overrides its action if necessary. 1703 * If child is null, assumes the MotionEvent will be sent to this ViewGroup instead. 1704 */ 1705 private boolean dispatchTransformedTouchEvent(MotionEvent event, boolean cancel, 1706 View child, int desiredPointerIdBits) { 1707 final boolean handled; 1708 1709 // Canceling motions is a special case. We don't need to perform any transformations 1710 // or filtering. The important part is the action, not the contents. 1711 final int oldAction = event.getAction(); 1712 if (cancel || oldAction == MotionEvent.ACTION_CANCEL) { 1713 event.setAction(MotionEvent.ACTION_CANCEL); 1714 if (child == null) { 1715 handled = super.dispatchTouchEvent(event); 1716 } else { 1717 handled = child.dispatchTouchEvent(event); 1718 } 1719 event.setAction(oldAction); 1720 return handled; 1721 } 1722 1723 // Calculate the number of pointers to deliver. 1724 final int oldPointerIdBits = event.getPointerIdBits(); 1725 final int newPointerIdBits = oldPointerIdBits & desiredPointerIdBits; 1726 1727 // If for some reason we ended up in an inconsistent state where it looks like we 1728 // might produce a motion event with no pointers in it, then drop the event. 1729 if (newPointerIdBits == 0) { 1730 return false; 1731 } 1732 1733 // If the number of pointers is the same and we don't need to perform any fancy 1734 // irreversible transformations, then we can reuse the motion event for this 1735 // dispatch as long as we are careful to revert any changes we make. 1736 // Otherwise we need to make a copy. 1737 final MotionEvent transformedEvent; 1738 if (newPointerIdBits == oldPointerIdBits) { 1739 if (child == null || child.hasIdentityMatrix()) { 1740 if (child == null) { 1741 handled = super.dispatchTouchEvent(event); 1742 } else { 1743 final float offsetX = mScrollX - child.mLeft; 1744 final float offsetY = mScrollY - child.mTop; 1745 event.offsetLocation(offsetX, offsetY); 1746 1747 handled = child.dispatchTouchEvent(event); 1748 1749 event.offsetLocation(-offsetX, -offsetY); 1750 } 1751 return handled; 1752 } 1753 transformedEvent = MotionEvent.obtain(event); 1754 } else { 1755 transformedEvent = event.split(newPointerIdBits); 1756 } 1757 1758 // Perform any necessary transformations and dispatch. 1759 if (child == null) { 1760 handled = super.dispatchTouchEvent(transformedEvent); 1761 } else { 1762 final float offsetX = mScrollX - child.mLeft; 1763 final float offsetY = mScrollY - child.mTop; 1764 transformedEvent.offsetLocation(offsetX, offsetY); 1765 if (! child.hasIdentityMatrix()) { 1766 transformedEvent.transform(child.getInverseMatrix()); 1767 } 1768 1769 handled = child.dispatchTouchEvent(transformedEvent); 1770 } 1771 1772 // Done. 1773 transformedEvent.recycle(); 1774 return handled; 1775 } 1776 1777 /** 1778 * Enable or disable the splitting of MotionEvents to multiple children during touch event 1779 * dispatch. This behavior is enabled by default for applications that target an 1780 * SDK version of {@link Build.VERSION_CODES#HONEYCOMB} or newer. 1781 * 1782 * <p>When this option is enabled MotionEvents may be split and dispatched to different child 1783 * views depending on where each pointer initially went down. This allows for user interactions 1784 * such as scrolling two panes of content independently, chording of buttons, and performing 1785 * independent gestures on different pieces of content. 1786 * 1787 * @param split <code>true</code> to allow MotionEvents to be split and dispatched to multiple 1788 * child views. <code>false</code> to only allow one child view to be the target of 1789 * any MotionEvent received by this ViewGroup. 1790 */ 1791 public void setMotionEventSplittingEnabled(boolean split) { 1792 // TODO Applications really shouldn't change this setting mid-touch event, 1793 // but perhaps this should handle that case and send ACTION_CANCELs to any child views 1794 // with gestures in progress when this is changed. 1795 if (split) { 1796 mGroupFlags |= FLAG_SPLIT_MOTION_EVENTS; 1797 } else { 1798 mGroupFlags &= ~FLAG_SPLIT_MOTION_EVENTS; 1799 } 1800 } 1801 1802 /** 1803 * Returns true if MotionEvents dispatched to this ViewGroup can be split to multiple children. 1804 * @return true if MotionEvents dispatched to this ViewGroup can be split to multiple children. 1805 */ 1806 public boolean isMotionEventSplittingEnabled() { 1807 return (mGroupFlags & FLAG_SPLIT_MOTION_EVENTS) == FLAG_SPLIT_MOTION_EVENTS; 1808 } 1809 1810 /** 1811 * {@inheritDoc} 1812 */ 1813 public void requestDisallowInterceptTouchEvent(boolean disallowIntercept) { 1814 1815 if (disallowIntercept == ((mGroupFlags & FLAG_DISALLOW_INTERCEPT) != 0)) { 1816 // We're already in this state, assume our ancestors are too 1817 return; 1818 } 1819 1820 if (disallowIntercept) { 1821 mGroupFlags |= FLAG_DISALLOW_INTERCEPT; 1822 } else { 1823 mGroupFlags &= ~FLAG_DISALLOW_INTERCEPT; 1824 } 1825 1826 // Pass it up to our parent 1827 if (mParent != null) { 1828 mParent.requestDisallowInterceptTouchEvent(disallowIntercept); 1829 } 1830 } 1831 1832 /** 1833 * Implement this method to intercept all touch screen motion events. This 1834 * allows you to watch events as they are dispatched to your children, and 1835 * take ownership of the current gesture at any point. 1836 * 1837 * <p>Using this function takes some care, as it has a fairly complicated 1838 * interaction with {@link View#onTouchEvent(MotionEvent) 1839 * View.onTouchEvent(MotionEvent)}, and using it requires implementing 1840 * that method as well as this one in the correct way. Events will be 1841 * received in the following order: 1842 * 1843 * <ol> 1844 * <li> You will receive the down event here. 1845 * <li> The down event will be handled either by a child of this view 1846 * group, or given to your own onTouchEvent() method to handle; this means 1847 * you should implement onTouchEvent() to return true, so you will 1848 * continue to see the rest of the gesture (instead of looking for 1849 * a parent view to handle it). Also, by returning true from 1850 * onTouchEvent(), you will not receive any following 1851 * events in onInterceptTouchEvent() and all touch processing must 1852 * happen in onTouchEvent() like normal. 1853 * <li> For as long as you return false from this function, each following 1854 * event (up to and including the final up) will be delivered first here 1855 * and then to the target's onTouchEvent(). 1856 * <li> If you return true from here, you will not receive any 1857 * following events: the target view will receive the same event but 1858 * with the action {@link MotionEvent#ACTION_CANCEL}, and all further 1859 * events will be delivered to your onTouchEvent() method and no longer 1860 * appear here. 1861 * </ol> 1862 * 1863 * @param ev The motion event being dispatched down the hierarchy. 1864 * @return Return true to steal motion events from the children and have 1865 * them dispatched to this ViewGroup through onTouchEvent(). 1866 * The current target will receive an ACTION_CANCEL event, and no further 1867 * messages will be delivered here. 1868 */ 1869 public boolean onInterceptTouchEvent(MotionEvent ev) { 1870 return false; 1871 } 1872 1873 /** 1874 * {@inheritDoc} 1875 * 1876 * Looks for a view to give focus to respecting the setting specified by 1877 * {@link #getDescendantFocusability()}. 1878 * 1879 * Uses {@link #onRequestFocusInDescendants(int, android.graphics.Rect)} to 1880 * find focus within the children of this group when appropriate. 1881 * 1882 * @see #FOCUS_BEFORE_DESCENDANTS 1883 * @see #FOCUS_AFTER_DESCENDANTS 1884 * @see #FOCUS_BLOCK_DESCENDANTS 1885 * @see #onRequestFocusInDescendants(int, android.graphics.Rect) 1886 */ 1887 @Override 1888 public boolean requestFocus(int direction, Rect previouslyFocusedRect) { 1889 if (DBG) { 1890 System.out.println(this + " ViewGroup.requestFocus direction=" 1891 + direction); 1892 } 1893 int descendantFocusability = getDescendantFocusability(); 1894 1895 switch (descendantFocusability) { 1896 case FOCUS_BLOCK_DESCENDANTS: 1897 return super.requestFocus(direction, previouslyFocusedRect); 1898 case FOCUS_BEFORE_DESCENDANTS: { 1899 final boolean took = super.requestFocus(direction, previouslyFocusedRect); 1900 return took ? took : onRequestFocusInDescendants(direction, previouslyFocusedRect); 1901 } 1902 case FOCUS_AFTER_DESCENDANTS: { 1903 final boolean took = onRequestFocusInDescendants(direction, previouslyFocusedRect); 1904 return took ? took : super.requestFocus(direction, previouslyFocusedRect); 1905 } 1906 default: 1907 throw new IllegalStateException("descendant focusability must be " 1908 + "one of FOCUS_BEFORE_DESCENDANTS, FOCUS_AFTER_DESCENDANTS, FOCUS_BLOCK_DESCENDANTS " 1909 + "but is " + descendantFocusability); 1910 } 1911 } 1912 1913 /** 1914 * Look for a descendant to call {@link View#requestFocus} on. 1915 * Called by {@link ViewGroup#requestFocus(int, android.graphics.Rect)} 1916 * when it wants to request focus within its children. Override this to 1917 * customize how your {@link ViewGroup} requests focus within its children. 1918 * @param direction One of FOCUS_UP, FOCUS_DOWN, FOCUS_LEFT, and FOCUS_RIGHT 1919 * @param previouslyFocusedRect The rectangle (in this View's coordinate system) 1920 * to give a finer grained hint about where focus is coming from. May be null 1921 * if there is no hint. 1922 * @return Whether focus was taken. 1923 */ 1924 @SuppressWarnings({"ConstantConditions"}) 1925 protected boolean onRequestFocusInDescendants(int direction, 1926 Rect previouslyFocusedRect) { 1927 int index; 1928 int increment; 1929 int end; 1930 int count = mChildrenCount; 1931 if ((direction & FOCUS_FORWARD) != 0) { 1932 index = 0; 1933 increment = 1; 1934 end = count; 1935 } else { 1936 index = count - 1; 1937 increment = -1; 1938 end = -1; 1939 } 1940 final View[] children = mChildren; 1941 for (int i = index; i != end; i += increment) { 1942 View child = children[i]; 1943 if ((child.mViewFlags & VISIBILITY_MASK) == VISIBLE) { 1944 if (child.requestFocus(direction, previouslyFocusedRect)) { 1945 return true; 1946 } 1947 } 1948 } 1949 return false; 1950 } 1951 1952 /** 1953 * {@inheritDoc} 1954 * 1955 * @hide 1956 */ 1957 @Override 1958 public void dispatchStartTemporaryDetach() { 1959 super.dispatchStartTemporaryDetach(); 1960 final int count = mChildrenCount; 1961 final View[] children = mChildren; 1962 for (int i = 0; i < count; i++) { 1963 children[i].dispatchStartTemporaryDetach(); 1964 } 1965 } 1966 1967 /** 1968 * {@inheritDoc} 1969 * 1970 * @hide 1971 */ 1972 @Override 1973 public void dispatchFinishTemporaryDetach() { 1974 super.dispatchFinishTemporaryDetach(); 1975 final int count = mChildrenCount; 1976 final View[] children = mChildren; 1977 for (int i = 0; i < count; i++) { 1978 children[i].dispatchFinishTemporaryDetach(); 1979 } 1980 } 1981 1982 /** 1983 * {@inheritDoc} 1984 */ 1985 @Override 1986 void dispatchAttachedToWindow(AttachInfo info, int visibility) { 1987 super.dispatchAttachedToWindow(info, visibility); 1988 visibility |= mViewFlags & VISIBILITY_MASK; 1989 final int count = mChildrenCount; 1990 final View[] children = mChildren; 1991 for (int i = 0; i < count; i++) { 1992 children[i].dispatchAttachedToWindow(info, visibility); 1993 } 1994 } 1995 1996 @Override 1997 public boolean dispatchPopulateAccessibilityEvent(AccessibilityEvent event) { 1998 // We first get a chance to populate the event. 1999 onPopulateAccessibilityEvent(event); 2000 // Let our children have a shot in populating the event. 2001 for (int i = 0, count = getChildCount(); i < count; i++) { 2002 boolean handled = getChildAt(i).dispatchPopulateAccessibilityEvent(event); 2003 if (handled) { 2004 return handled; 2005 } 2006 } 2007 return false; 2008 } 2009 2010 /** 2011 * {@inheritDoc} 2012 */ 2013 @Override 2014 void dispatchDetachedFromWindow() { 2015 // If we still have a touch target, we are still in the process of 2016 // dispatching motion events to a child; we need to get rid of that 2017 // child to avoid dispatching events to it after the window is torn 2018 // down. To make sure we keep the child in a consistent state, we 2019 // first send it an ACTION_CANCEL motion event. 2020 cancelAndClearTouchTargets(null); 2021 2022 // In case view is detached while transition is running 2023 mLayoutSuppressed = false; 2024 2025 // Tear down our drag tracking 2026 mDragNotifiedChildren = null; 2027 if (mCurrentDrag != null) { 2028 mCurrentDrag.recycle(); 2029 mCurrentDrag = null; 2030 } 2031 2032 final int count = mChildrenCount; 2033 final View[] children = mChildren; 2034 for (int i = 0; i < count; i++) { 2035 children[i].dispatchDetachedFromWindow(); 2036 } 2037 super.dispatchDetachedFromWindow(); 2038 } 2039 2040 /** 2041 * {@inheritDoc} 2042 */ 2043 @Override 2044 public void setPadding(int left, int top, int right, int bottom) { 2045 super.setPadding(left, top, right, bottom); 2046 2047 if ((mPaddingLeft | mPaddingTop | mPaddingRight | mPaddingBottom) != 0) { 2048 mGroupFlags |= FLAG_PADDING_NOT_NULL; 2049 } else { 2050 mGroupFlags &= ~FLAG_PADDING_NOT_NULL; 2051 } 2052 } 2053 2054 /** 2055 * {@inheritDoc} 2056 */ 2057 @Override 2058 protected void dispatchSaveInstanceState(SparseArray<Parcelable> container) { 2059 super.dispatchSaveInstanceState(container); 2060 final int count = mChildrenCount; 2061 final View[] children = mChildren; 2062 for (int i = 0; i < count; i++) { 2063 View c = children[i]; 2064 if ((c.mViewFlags & PARENT_SAVE_DISABLED_MASK) != PARENT_SAVE_DISABLED) { 2065 c.dispatchSaveInstanceState(container); 2066 } 2067 } 2068 } 2069 2070 /** 2071 * Perform dispatching of a {@link #saveHierarchyState(android.util.SparseArray)} freeze()} 2072 * to only this view, not to its children. For use when overriding 2073 * {@link #dispatchSaveInstanceState(android.util.SparseArray)} dispatchFreeze()} to allow 2074 * subclasses to freeze their own state but not the state of their children. 2075 * 2076 * @param container the container 2077 */ 2078 protected void dispatchFreezeSelfOnly(SparseArray<Parcelable> container) { 2079 super.dispatchSaveInstanceState(container); 2080 } 2081 2082 /** 2083 * {@inheritDoc} 2084 */ 2085 @Override 2086 protected void dispatchRestoreInstanceState(SparseArray<Parcelable> container) { 2087 super.dispatchRestoreInstanceState(container); 2088 final int count = mChildrenCount; 2089 final View[] children = mChildren; 2090 for (int i = 0; i < count; i++) { 2091 View c = children[i]; 2092 if ((c.mViewFlags & PARENT_SAVE_DISABLED_MASK) != PARENT_SAVE_DISABLED) { 2093 c.dispatchRestoreInstanceState(container); 2094 } 2095 } 2096 } 2097 2098 /** 2099 * Perform dispatching of a {@link #restoreHierarchyState(android.util.SparseArray)} 2100 * to only this view, not to its children. For use when overriding 2101 * {@link #dispatchRestoreInstanceState(android.util.SparseArray)} to allow 2102 * subclasses to thaw their own state but not the state of their children. 2103 * 2104 * @param container the container 2105 */ 2106 protected void dispatchThawSelfOnly(SparseArray<Parcelable> container) { 2107 super.dispatchRestoreInstanceState(container); 2108 } 2109 2110 /** 2111 * Enables or disables the drawing cache for each child of this view group. 2112 * 2113 * @param enabled true to enable the cache, false to dispose of it 2114 */ 2115 protected void setChildrenDrawingCacheEnabled(boolean enabled) { 2116 if (enabled || (mPersistentDrawingCache & PERSISTENT_ALL_CACHES) != PERSISTENT_ALL_CACHES) { 2117 final View[] children = mChildren; 2118 final int count = mChildrenCount; 2119 for (int i = 0; i < count; i++) { 2120 children[i].setDrawingCacheEnabled(enabled); 2121 } 2122 } 2123 } 2124 2125 @Override 2126 protected void onAnimationStart() { 2127 super.onAnimationStart(); 2128 2129 // When this ViewGroup's animation starts, build the cache for the children 2130 if ((mGroupFlags & FLAG_ANIMATION_CACHE) == FLAG_ANIMATION_CACHE) { 2131 final int count = mChildrenCount; 2132 final View[] children = mChildren; 2133 final boolean buildCache = !isHardwareAccelerated(); 2134 2135 for (int i = 0; i < count; i++) { 2136 final View child = children[i]; 2137 if ((child.mViewFlags & VISIBILITY_MASK) == VISIBLE) { 2138 child.setDrawingCacheEnabled(true); 2139 if (buildCache) { 2140 child.buildDrawingCache(true); 2141 } 2142 } 2143 } 2144 2145 mGroupFlags |= FLAG_CHILDREN_DRAWN_WITH_CACHE; 2146 } 2147 } 2148 2149 @Override 2150 protected void onAnimationEnd() { 2151 super.onAnimationEnd(); 2152 2153 // When this ViewGroup's animation ends, destroy the cache of the children 2154 if ((mGroupFlags & FLAG_ANIMATION_CACHE) == FLAG_ANIMATION_CACHE) { 2155 mGroupFlags &= ~FLAG_CHILDREN_DRAWN_WITH_CACHE; 2156 2157 if ((mPersistentDrawingCache & PERSISTENT_ANIMATION_CACHE) == 0) { 2158 setChildrenDrawingCacheEnabled(false); 2159 } 2160 } 2161 } 2162 2163 @Override 2164 Bitmap createSnapshot(Bitmap.Config quality, int backgroundColor, boolean skipChildren) { 2165 int count = mChildrenCount; 2166 int[] visibilities = null; 2167 2168 if (skipChildren) { 2169 visibilities = new int[count]; 2170 for (int i = 0; i < count; i++) { 2171 View child = getChildAt(i); 2172 visibilities[i] = child.getVisibility(); 2173 if (visibilities[i] == View.VISIBLE) { 2174 child.setVisibility(INVISIBLE); 2175 } 2176 } 2177 } 2178 2179 Bitmap b = super.createSnapshot(quality, backgroundColor, skipChildren); 2180 2181 if (skipChildren) { 2182 for (int i = 0; i < count; i++) { 2183 getChildAt(i).setVisibility(visibilities[i]); 2184 } 2185 } 2186 2187 return b; 2188 } 2189 2190 /** 2191 * {@inheritDoc} 2192 */ 2193 @Override 2194 protected void dispatchDraw(Canvas canvas) { 2195 final int count = mChildrenCount; 2196 final View[] children = mChildren; 2197 int flags = mGroupFlags; 2198 2199 if ((flags & FLAG_RUN_ANIMATION) != 0 && canAnimate()) { 2200 final boolean cache = (mGroupFlags & FLAG_ANIMATION_CACHE) == FLAG_ANIMATION_CACHE; 2201 2202 final boolean buildCache = !isHardwareAccelerated(); 2203 for (int i = 0; i < count; i++) { 2204 final View child = children[i]; 2205 if ((child.mViewFlags & VISIBILITY_MASK) == VISIBLE) { 2206 final LayoutParams params = child.getLayoutParams(); 2207 attachLayoutAnimationParameters(child, params, i, count); 2208 bindLayoutAnimation(child); 2209 if (cache) { 2210 child.setDrawingCacheEnabled(true); 2211 if (buildCache) { 2212 child.buildDrawingCache(true); 2213 } 2214 } 2215 } 2216 } 2217 2218 final LayoutAnimationController controller = mLayoutAnimationController; 2219 if (controller.willOverlap()) { 2220 mGroupFlags |= FLAG_OPTIMIZE_INVALIDATE; 2221 } 2222 2223 controller.start(); 2224 2225 mGroupFlags &= ~FLAG_RUN_ANIMATION; 2226 mGroupFlags &= ~FLAG_ANIMATION_DONE; 2227 2228 if (cache) { 2229 mGroupFlags |= FLAG_CHILDREN_DRAWN_WITH_CACHE; 2230 } 2231 2232 if (mAnimationListener != null) { 2233 mAnimationListener.onAnimationStart(controller.getAnimation()); 2234 } 2235 } 2236 2237 int saveCount = 0; 2238 final boolean clipToPadding = (flags & CLIP_TO_PADDING_MASK) == CLIP_TO_PADDING_MASK; 2239 if (clipToPadding) { 2240 saveCount = canvas.save(); 2241 canvas.clipRect(mScrollX + mPaddingLeft, mScrollY + mPaddingTop, 2242 mScrollX + mRight - mLeft - mPaddingRight, 2243 mScrollY + mBottom - mTop - mPaddingBottom); 2244 2245 } 2246 2247 // We will draw our child's animation, let's reset the flag 2248 mPrivateFlags &= ~DRAW_ANIMATION; 2249 mGroupFlags &= ~FLAG_INVALIDATE_REQUIRED; 2250 2251 boolean more = false; 2252 final long drawingTime = getDrawingTime(); 2253 2254 if ((flags & FLAG_USE_CHILD_DRAWING_ORDER) == 0) { 2255 for (int i = 0; i < count; i++) { 2256 final View child = children[i]; 2257 if ((child.mViewFlags & VISIBILITY_MASK) == VISIBLE || child.getAnimation() != null) { 2258 more |= drawChild(canvas, child, drawingTime); 2259 } 2260 } 2261 } else { 2262 for (int i = 0; i < count; i++) { 2263 final View child = children[getChildDrawingOrder(count, i)]; 2264 if ((child.mViewFlags & VISIBILITY_MASK) == VISIBLE || child.getAnimation() != null) { 2265 more |= drawChild(canvas, child, drawingTime); 2266 } 2267 } 2268 } 2269 2270 // Draw any disappearing views that have animations 2271 if (mDisappearingChildren != null) { 2272 final ArrayList<View> disappearingChildren = mDisappearingChildren; 2273 final int disappearingCount = disappearingChildren.size() - 1; 2274 // Go backwards -- we may delete as animations finish 2275 for (int i = disappearingCount; i >= 0; i--) { 2276 final View child = disappearingChildren.get(i); 2277 more |= drawChild(canvas, child, drawingTime); 2278 } 2279 } 2280 2281 if (clipToPadding) { 2282 canvas.restoreToCount(saveCount); 2283 } 2284 2285 // mGroupFlags might have been updated by drawChild() 2286 flags = mGroupFlags; 2287 2288 if ((flags & FLAG_INVALIDATE_REQUIRED) == FLAG_INVALIDATE_REQUIRED) { 2289 invalidate(true); 2290 } 2291 2292 if ((flags & FLAG_ANIMATION_DONE) == 0 && (flags & FLAG_NOTIFY_ANIMATION_LISTENER) == 0 && 2293 mLayoutAnimationController.isDone() && !more) { 2294 // We want to erase the drawing cache and notify the listener after the 2295 // next frame is drawn because one extra invalidate() is caused by 2296 // drawChild() after the animation is over 2297 mGroupFlags |= FLAG_NOTIFY_ANIMATION_LISTENER; 2298 final Runnable end = new Runnable() { 2299 public void run() { 2300 notifyAnimationListener(); 2301 } 2302 }; 2303 post(end); 2304 } 2305 } 2306 2307 /** 2308 * Returns the index of the child to draw for this iteration. Override this 2309 * if you want to change the drawing order of children. By default, it 2310 * returns i. 2311 * <p> 2312 * NOTE: In order for this method to be called, you must enable child ordering 2313 * first by calling {@link #setChildrenDrawingOrderEnabled(boolean)}. 2314 * 2315 * @param i The current iteration. 2316 * @return The index of the child to draw this iteration. 2317 * 2318 * @see #setChildrenDrawingOrderEnabled(boolean) 2319 * @see #isChildrenDrawingOrderEnabled() 2320 */ 2321 protected int getChildDrawingOrder(int childCount, int i) { 2322 return i; 2323 } 2324 2325 private void notifyAnimationListener() { 2326 mGroupFlags &= ~FLAG_NOTIFY_ANIMATION_LISTENER; 2327 mGroupFlags |= FLAG_ANIMATION_DONE; 2328 2329 if (mAnimationListener != null) { 2330 final Runnable end = new Runnable() { 2331 public void run() { 2332 mAnimationListener.onAnimationEnd(mLayoutAnimationController.getAnimation()); 2333 } 2334 }; 2335 post(end); 2336 } 2337 2338 if ((mGroupFlags & FLAG_ANIMATION_CACHE) == FLAG_ANIMATION_CACHE) { 2339 mGroupFlags &= ~FLAG_CHILDREN_DRAWN_WITH_CACHE; 2340 if ((mPersistentDrawingCache & PERSISTENT_ANIMATION_CACHE) == 0) { 2341 setChildrenDrawingCacheEnabled(false); 2342 } 2343 } 2344 2345 invalidate(true); 2346 } 2347 2348 /** 2349 * This method is used to cause children of this ViewGroup to restore or recreate their 2350 * display lists. It is called by getDisplayList() when the parent ViewGroup does not need 2351 * to recreate its own display list, which would happen if it went through the normal 2352 * draw/dispatchDraw mechanisms. 2353 * 2354 * @hide 2355 */ 2356 @Override 2357 protected void dispatchGetDisplayList() { 2358 final int count = mChildrenCount; 2359 final View[] children = mChildren; 2360 for (int i = 0; i < count; i++) { 2361 final View child = children[i]; 2362 if ((child.mViewFlags & VISIBILITY_MASK) == VISIBLE || child.getAnimation() != null) { 2363 child.mRecreateDisplayList = (child.mPrivateFlags & INVALIDATED) == INVALIDATED; 2364 child.mPrivateFlags &= ~INVALIDATED; 2365 child.getDisplayList(); 2366 child.mRecreateDisplayList = false; 2367 } 2368 } 2369 } 2370 2371 /** 2372 * Draw one child of this View Group. This method is responsible for getting 2373 * the canvas in the right state. This includes clipping, translating so 2374 * that the child's scrolled origin is at 0, 0, and applying any animation 2375 * transformations. 2376 * 2377 * @param canvas The canvas on which to draw the child 2378 * @param child Who to draw 2379 * @param drawingTime The time at which draw is occuring 2380 * @return True if an invalidate() was issued 2381 */ 2382 protected boolean drawChild(Canvas canvas, View child, long drawingTime) { 2383 boolean more = false; 2384 2385 final int cl = child.mLeft; 2386 final int ct = child.mTop; 2387 final int cr = child.mRight; 2388 final int cb = child.mBottom; 2389 2390 final boolean childHasIdentityMatrix = child.hasIdentityMatrix(); 2391 2392 final int flags = mGroupFlags; 2393 2394 if ((flags & FLAG_CLEAR_TRANSFORMATION) == FLAG_CLEAR_TRANSFORMATION) { 2395 mChildTransformation.clear(); 2396 mGroupFlags &= ~FLAG_CLEAR_TRANSFORMATION; 2397 } 2398 2399 Transformation transformToApply = null; 2400 Transformation invalidationTransform; 2401 final Animation a = child.getAnimation(); 2402 boolean concatMatrix = false; 2403 2404 boolean scalingRequired = false; 2405 boolean caching; 2406 int layerType = mDrawLayers ? child.getLayerType() : LAYER_TYPE_NONE; 2407 2408 final boolean hardwareAccelerated = canvas.isHardwareAccelerated(); 2409 if ((flags & FLAG_CHILDREN_DRAWN_WITH_CACHE) == FLAG_CHILDREN_DRAWN_WITH_CACHE || 2410 (flags & FLAG_ALWAYS_DRAWN_WITH_CACHE) == FLAG_ALWAYS_DRAWN_WITH_CACHE) { 2411 caching = true; 2412 if (mAttachInfo != null) scalingRequired = mAttachInfo.mScalingRequired; 2413 } else { 2414 caching = (layerType != LAYER_TYPE_NONE) || hardwareAccelerated; 2415 } 2416 2417 if (a != null) { 2418 final boolean initialized = a.isInitialized(); 2419 if (!initialized) { 2420 a.initialize(cr - cl, cb - ct, getWidth(), getHeight()); 2421 a.initializeInvalidateRegion(0, 0, cr - cl, cb - ct); 2422 child.onAnimationStart(); 2423 } 2424 2425 more = a.getTransformation(drawingTime, mChildTransformation, 2426 scalingRequired ? mAttachInfo.mApplicationScale : 1f); 2427 if (scalingRequired && mAttachInfo.mApplicationScale != 1f) { 2428 if (mInvalidationTransformation == null) { 2429 mInvalidationTransformation = new Transformation(); 2430 } 2431 invalidationTransform = mInvalidationTransformation; 2432 a.getTransformation(drawingTime, invalidationTransform, 1f); 2433 } else { 2434 invalidationTransform = mChildTransformation; 2435 } 2436 transformToApply = mChildTransformation; 2437 2438 concatMatrix = a.willChangeTransformationMatrix(); 2439 2440 if (more) { 2441 if (!a.willChangeBounds()) { 2442 if ((flags & (FLAG_OPTIMIZE_INVALIDATE | FLAG_ANIMATION_DONE)) == 2443 FLAG_OPTIMIZE_INVALIDATE) { 2444 mGroupFlags |= FLAG_INVALIDATE_REQUIRED; 2445 } else if ((flags & FLAG_INVALIDATE_REQUIRED) == 0) { 2446 // The child need to draw an animation, potentially offscreen, so 2447 // make sure we do not cancel invalidate requests 2448 mPrivateFlags |= DRAW_ANIMATION; 2449 invalidate(cl, ct, cr, cb); 2450 } 2451 } else { 2452 if (mInvalidateRegion == null) { 2453 mInvalidateRegion = new RectF(); 2454 } 2455 final RectF region = mInvalidateRegion; 2456 a.getInvalidateRegion(0, 0, cr - cl, cb - ct, region, invalidationTransform); 2457 2458 // The child need to draw an animation, potentially offscreen, so 2459 // make sure we do not cancel invalidate requests 2460 mPrivateFlags |= DRAW_ANIMATION; 2461 2462 final int left = cl + (int) region.left; 2463 final int top = ct + (int) region.top; 2464 invalidate(left, top, left + (int) region.width(), top + (int) region.height()); 2465 } 2466 } 2467 } else if ((flags & FLAG_SUPPORT_STATIC_TRANSFORMATIONS) == 2468 FLAG_SUPPORT_STATIC_TRANSFORMATIONS) { 2469 final boolean hasTransform = getChildStaticTransformation(child, mChildTransformation); 2470 if (hasTransform) { 2471 final int transformType = mChildTransformation.getTransformationType(); 2472 transformToApply = transformType != Transformation.TYPE_IDENTITY ? 2473 mChildTransformation : null; 2474 concatMatrix = (transformType & Transformation.TYPE_MATRIX) != 0; 2475 } 2476 } 2477 2478 concatMatrix |= !childHasIdentityMatrix; 2479 2480 // Sets the flag as early as possible to allow draw() implementations 2481 // to call invalidate() successfully when doing animations 2482 child.mPrivateFlags |= DRAWN; 2483 2484 if (!concatMatrix && canvas.quickReject(cl, ct, cr, cb, Canvas.EdgeType.BW) && 2485 (child.mPrivateFlags & DRAW_ANIMATION) == 0) { 2486 return more; 2487 } 2488 2489 float alpha = child.getAlpha(); 2490 // Bail out early if the view does not need to be drawn 2491 if (alpha <= ViewConfiguration.ALPHA_THRESHOLD && (child.mPrivateFlags & ALPHA_SET) == 0 && 2492 !(child instanceof SurfaceView)) { 2493 return more; 2494 } 2495 2496 if (hardwareAccelerated) { 2497 // Clear INVALIDATED flag to allow invalidation to occur during rendering, but 2498 // retain the flag's value temporarily in the mRecreateDisplayList flag 2499 child.mRecreateDisplayList = (child.mPrivateFlags & INVALIDATED) == INVALIDATED; 2500 child.mPrivateFlags &= ~INVALIDATED; 2501 } 2502 2503 child.computeScroll(); 2504 2505 final int sx = child.mScrollX; 2506 final int sy = child.mScrollY; 2507 2508 DisplayList displayList = null; 2509 Bitmap cache = null; 2510 boolean hasDisplayList = false; 2511 if (caching) { 2512 if (!hardwareAccelerated) { 2513 if (layerType != LAYER_TYPE_NONE) { 2514 layerType = LAYER_TYPE_SOFTWARE; 2515 child.buildDrawingCache(true); 2516 } 2517 cache = child.getDrawingCache(true); 2518 } else { 2519 switch (layerType) { 2520 case LAYER_TYPE_SOFTWARE: 2521 child.buildDrawingCache(true); 2522 cache = child.getDrawingCache(true); 2523 break; 2524 case LAYER_TYPE_NONE: 2525 // Delay getting the display list until animation-driven alpha values are 2526 // set up and possibly passed on to the view 2527 hasDisplayList = child.canHaveDisplayList(); 2528 break; 2529 } 2530 } 2531 } 2532 2533 final boolean hasNoCache = cache == null || hasDisplayList; 2534 final boolean offsetForScroll = cache == null && !hasDisplayList && 2535 layerType != LAYER_TYPE_HARDWARE; 2536 2537 final int restoreTo = canvas.save(); 2538 if (offsetForScroll) { 2539 canvas.translate(cl - sx, ct - sy); 2540 } else { 2541 canvas.translate(cl, ct); 2542 if (scalingRequired) { 2543 // mAttachInfo cannot be null, otherwise scalingRequired == false 2544 final float scale = 1.0f / mAttachInfo.mApplicationScale; 2545 canvas.scale(scale, scale); 2546 } 2547 } 2548 2549 if (transformToApply != null || alpha < 1.0f || !child.hasIdentityMatrix()) { 2550 if (transformToApply != null || !childHasIdentityMatrix) { 2551 int transX = 0; 2552 int transY = 0; 2553 2554 if (offsetForScroll) { 2555 transX = -sx; 2556 transY = -sy; 2557 } 2558 2559 if (transformToApply != null) { 2560 if (concatMatrix) { 2561 // Undo the scroll translation, apply the transformation matrix, 2562 // then redo the scroll translate to get the correct result. 2563 canvas.translate(-transX, -transY); 2564 canvas.concat(transformToApply.getMatrix()); 2565 canvas.translate(transX, transY); 2566 mGroupFlags |= FLAG_CLEAR_TRANSFORMATION; 2567 } 2568 2569 float transformAlpha = transformToApply.getAlpha(); 2570 if (transformAlpha < 1.0f) { 2571 alpha *= transformToApply.getAlpha(); 2572 mGroupFlags |= FLAG_CLEAR_TRANSFORMATION; 2573 } 2574 } 2575 2576 if (!childHasIdentityMatrix) { 2577 canvas.translate(-transX, -transY); 2578 canvas.concat(child.getMatrix()); 2579 canvas.translate(transX, transY); 2580 } 2581 } 2582 2583 if (alpha < 1.0f) { 2584 mGroupFlags |= FLAG_CLEAR_TRANSFORMATION; 2585 if (hasNoCache) { 2586 final int multipliedAlpha = (int) (255 * alpha); 2587 if (!child.onSetAlpha(multipliedAlpha)) { 2588 int layerFlags = Canvas.HAS_ALPHA_LAYER_SAVE_FLAG; 2589 if ((flags & FLAG_CLIP_CHILDREN) == FLAG_CLIP_CHILDREN || 2590 layerType != LAYER_TYPE_NONE) { 2591 layerFlags |= Canvas.CLIP_TO_LAYER_SAVE_FLAG; 2592 } 2593 if (layerType == LAYER_TYPE_NONE) { 2594 final int scrollX = hasDisplayList ? 0 : sx; 2595 final int scrollY = hasDisplayList ? 0 : sy; 2596 canvas.saveLayerAlpha(scrollX, scrollY, scrollX + cr - cl, 2597 scrollY + cb - ct, multipliedAlpha, layerFlags); 2598 } 2599 } else { 2600 // Alpha is handled by the child directly, clobber the layer's alpha 2601 child.mPrivateFlags |= ALPHA_SET; 2602 } 2603 } 2604 } 2605 } else if ((child.mPrivateFlags & ALPHA_SET) == ALPHA_SET) { 2606 child.onSetAlpha(255); 2607 child.mPrivateFlags &= ~ALPHA_SET; 2608 } 2609 2610 if ((flags & FLAG_CLIP_CHILDREN) == FLAG_CLIP_CHILDREN) { 2611 if (offsetForScroll) { 2612 canvas.clipRect(sx, sy, sx + (cr - cl), sy + (cb - ct)); 2613 } else { 2614 if (!scalingRequired || cache == null) { 2615 canvas.clipRect(0, 0, cr - cl, cb - ct); 2616 } else { 2617 canvas.clipRect(0, 0, cache.getWidth(), cache.getHeight()); 2618 } 2619 } 2620 } 2621 2622 if (hasDisplayList) { 2623 displayList = child.getDisplayList(); 2624 } 2625 2626 if (hasNoCache) { 2627 boolean layerRendered = false; 2628 if (layerType == LAYER_TYPE_HARDWARE) { 2629 final HardwareLayer layer = child.getHardwareLayer(); 2630 if (layer != null && layer.isValid()) { 2631 child.mLayerPaint.setAlpha((int) (alpha * 255)); 2632 ((HardwareCanvas) canvas).drawHardwareLayer(layer, 0, 0, child.mLayerPaint); 2633 layerRendered = true; 2634 } else { 2635 final int scrollX = hasDisplayList ? 0 : sx; 2636 final int scrollY = hasDisplayList ? 0 : sy; 2637 canvas.saveLayer(scrollX, scrollY, 2638 scrollX + cr - cl, scrollY + cb - ct, child.mLayerPaint, 2639 Canvas.HAS_ALPHA_LAYER_SAVE_FLAG | Canvas.CLIP_TO_LAYER_SAVE_FLAG); 2640 } 2641 } 2642 2643 if (!layerRendered) { 2644 if (!hasDisplayList) { 2645 // Fast path for layouts with no backgrounds 2646 if ((child.mPrivateFlags & SKIP_DRAW) == SKIP_DRAW) { 2647 if (ViewDebug.TRACE_HIERARCHY) { 2648 ViewDebug.trace(this, ViewDebug.HierarchyTraceType.DRAW); 2649 } 2650 child.mPrivateFlags &= ~DIRTY_MASK; 2651 child.dispatchDraw(canvas); 2652 } else { 2653 child.draw(canvas); 2654 } 2655 } else { 2656 child.mPrivateFlags &= ~DIRTY_MASK; 2657 ((HardwareCanvas) canvas).drawDisplayList(displayList, cr - cl, cb - ct, null); 2658 } 2659 } 2660 } else if (cache != null) { 2661 child.mPrivateFlags &= ~DIRTY_MASK; 2662 Paint cachePaint; 2663 2664 if (layerType == LAYER_TYPE_NONE) { 2665 cachePaint = mCachePaint; 2666 if (alpha < 1.0f) { 2667 cachePaint.setAlpha((int) (alpha * 255)); 2668 mGroupFlags |= FLAG_ALPHA_LOWER_THAN_ONE; 2669 } else if ((flags & FLAG_ALPHA_LOWER_THAN_ONE) == FLAG_ALPHA_LOWER_THAN_ONE) { 2670 cachePaint.setAlpha(255); 2671 mGroupFlags &= ~FLAG_ALPHA_LOWER_THAN_ONE; 2672 } 2673 } else { 2674 cachePaint = child.mLayerPaint; 2675 cachePaint.setAlpha((int) (alpha * 255)); 2676 } 2677 canvas.drawBitmap(cache, 0.0f, 0.0f, cachePaint); 2678 } 2679 2680 canvas.restoreToCount(restoreTo); 2681 2682 if (a != null && !more) { 2683 if (!hardwareAccelerated && !a.getFillAfter()) { 2684 child.onSetAlpha(255); 2685 } 2686 finishAnimatingView(child, a); 2687 } 2688 2689 if (more && hardwareAccelerated) { 2690 // invalidation is the trigger to recreate display lists, so if we're using 2691 // display lists to render, force an invalidate to allow the animation to 2692 // continue drawing another frame 2693 invalidate(true); 2694 if (a instanceof AlphaAnimation) { 2695 // alpha animations should cause the child to recreate its display list 2696 child.invalidate(true); 2697 } 2698 } 2699 2700 child.mRecreateDisplayList = false; 2701 2702 return more; 2703 } 2704 2705 /** 2706 * 2707 * @param enabled True if children should be drawn with layers, false otherwise. 2708 * 2709 * @hide 2710 */ 2711 public void setChildrenLayersEnabled(boolean enabled) { 2712 if (enabled != mDrawLayers) { 2713 mDrawLayers = enabled; 2714 invalidate(true); 2715 2716 // We need to invalidate any child with a layer. For instance, 2717 // if a child is backed by a hardware layer and we disable layers 2718 // the child is marked as not dirty (flags cleared the last time 2719 // the child was drawn inside its layer.) However, that child might 2720 // never have created its own display list or have an obsolete 2721 // display list. By invalidating the child we ensure the display 2722 // list is in sync with the content of the hardware layer. 2723 for (int i = 0; i < mChildrenCount; i++) { 2724 View child = mChildren[i]; 2725 if (child.mLayerType != LAYER_TYPE_NONE) { 2726 child.invalidate(true); 2727 } 2728 } 2729 } 2730 } 2731 2732 /** 2733 * By default, children are clipped to their bounds before drawing. This 2734 * allows view groups to override this behavior for animations, etc. 2735 * 2736 * @param clipChildren true to clip children to their bounds, 2737 * false otherwise 2738 * @attr ref android.R.styleable#ViewGroup_clipChildren 2739 */ 2740 public void setClipChildren(boolean clipChildren) { 2741 setBooleanFlag(FLAG_CLIP_CHILDREN, clipChildren); 2742 } 2743 2744 /** 2745 * By default, children are clipped to the padding of the ViewGroup. This 2746 * allows view groups to override this behavior 2747 * 2748 * @param clipToPadding true to clip children to the padding of the 2749 * group, false otherwise 2750 * @attr ref android.R.styleable#ViewGroup_clipToPadding 2751 */ 2752 public void setClipToPadding(boolean clipToPadding) { 2753 setBooleanFlag(FLAG_CLIP_TO_PADDING, clipToPadding); 2754 } 2755 2756 /** 2757 * {@inheritDoc} 2758 */ 2759 @Override 2760 public void dispatchSetSelected(boolean selected) { 2761 final View[] children = mChildren; 2762 final int count = mChildrenCount; 2763 for (int i = 0; i < count; i++) { 2764 children[i].setSelected(selected); 2765 } 2766 } 2767 2768 /** 2769 * {@inheritDoc} 2770 */ 2771 @Override 2772 public void dispatchSetActivated(boolean activated) { 2773 final View[] children = mChildren; 2774 final int count = mChildrenCount; 2775 for (int i = 0; i < count; i++) { 2776 children[i].setActivated(activated); 2777 } 2778 } 2779 2780 @Override 2781 protected void dispatchSetPressed(boolean pressed) { 2782 final View[] children = mChildren; 2783 final int count = mChildrenCount; 2784 for (int i = 0; i < count; i++) { 2785 children[i].setPressed(pressed); 2786 } 2787 } 2788 2789 /** 2790 * When this property is set to true, this ViewGroup supports static transformations on 2791 * children; this causes 2792 * {@link #getChildStaticTransformation(View, android.view.animation.Transformation)} to be 2793 * invoked when a child is drawn. 2794 * 2795 * Any subclass overriding 2796 * {@link #getChildStaticTransformation(View, android.view.animation.Transformation)} should 2797 * set this property to true. 2798 * 2799 * @param enabled True to enable static transformations on children, false otherwise. 2800 * 2801 * @see #FLAG_SUPPORT_STATIC_TRANSFORMATIONS 2802 */ 2803 protected void setStaticTransformationsEnabled(boolean enabled) { 2804 setBooleanFlag(FLAG_SUPPORT_STATIC_TRANSFORMATIONS, enabled); 2805 } 2806 2807 /** 2808 * {@inheritDoc} 2809 * 2810 * @see #setStaticTransformationsEnabled(boolean) 2811 */ 2812 protected boolean getChildStaticTransformation(View child, Transformation t) { 2813 return false; 2814 } 2815 2816 /** 2817 * {@hide} 2818 */ 2819 @Override 2820 protected View findViewTraversal(int id) { 2821 if (id == mID) { 2822 return this; 2823 } 2824 2825 final View[] where = mChildren; 2826 final int len = mChildrenCount; 2827 2828 for (int i = 0; i < len; i++) { 2829 View v = where[i]; 2830 2831 if ((v.mPrivateFlags & IS_ROOT_NAMESPACE) == 0) { 2832 v = v.findViewById(id); 2833 2834 if (v != null) { 2835 return v; 2836 } 2837 } 2838 } 2839 2840 return null; 2841 } 2842 2843 /** 2844 * {@hide} 2845 */ 2846 @Override 2847 protected View findViewWithTagTraversal(Object tag) { 2848 if (tag != null && tag.equals(mTag)) { 2849 return this; 2850 } 2851 2852 final View[] where = mChildren; 2853 final int len = mChildrenCount; 2854 2855 for (int i = 0; i < len; i++) { 2856 View v = where[i]; 2857 2858 if ((v.mPrivateFlags & IS_ROOT_NAMESPACE) == 0) { 2859 v = v.findViewWithTag(tag); 2860 2861 if (v != null) { 2862 return v; 2863 } 2864 } 2865 } 2866 2867 return null; 2868 } 2869 2870 /** 2871 * {@hide} 2872 */ 2873 @Override 2874 protected View findViewByPredicateTraversal(Predicate<View> predicate) { 2875 if (predicate.apply(this)) { 2876 return this; 2877 } 2878 2879 final View[] where = mChildren; 2880 final int len = mChildrenCount; 2881 2882 for (int i = 0; i < len; i++) { 2883 View v = where[i]; 2884 2885 if ((v.mPrivateFlags & IS_ROOT_NAMESPACE) == 0) { 2886 v = v.findViewByPredicate(predicate); 2887 2888 if (v != null) { 2889 return v; 2890 } 2891 } 2892 } 2893 2894 return null; 2895 } 2896 2897 /** 2898 * Adds a child view. If no layout parameters are already set on the child, the 2899 * default parameters for this ViewGroup are set on the child. 2900 * 2901 * @param child the child view to add 2902 * 2903 * @see #generateDefaultLayoutParams() 2904 */ 2905 public void addView(View child) { 2906 addView(child, -1); 2907 } 2908 2909 /** 2910 * Adds a child view. If no layout parameters are already set on the child, the 2911 * default parameters for this ViewGroup are set on the child. 2912 * 2913 * @param child the child view to add 2914 * @param index the position at which to add the child 2915 * 2916 * @see #generateDefaultLayoutParams() 2917 */ 2918 public void addView(View child, int index) { 2919 LayoutParams params = child.getLayoutParams(); 2920 if (params == null) { 2921 params = generateDefaultLayoutParams(); 2922 if (params == null) { 2923 throw new IllegalArgumentException("generateDefaultLayoutParams() cannot return null"); 2924 } 2925 } 2926 addView(child, index, params); 2927 } 2928 2929 /** 2930 * Adds a child view with this ViewGroup's default layout parameters and the 2931 * specified width and height. 2932 * 2933 * @param child the child view to add 2934 */ 2935 public void addView(View child, int width, int height) { 2936 final LayoutParams params = generateDefaultLayoutParams(); 2937 params.width = width; 2938 params.height = height; 2939 addView(child, -1, params); 2940 } 2941 2942 /** 2943 * Adds a child view with the specified layout parameters. 2944 * 2945 * @param child the child view to add 2946 * @param params the layout parameters to set on the child 2947 */ 2948 public void addView(View child, LayoutParams params) { 2949 addView(child, -1, params); 2950 } 2951 2952 /** 2953 * Adds a child view with the specified layout parameters. 2954 * 2955 * @param child the child view to add 2956 * @param index the position at which to add the child 2957 * @param params the layout parameters to set on the child 2958 */ 2959 public void addView(View child, int index, LayoutParams params) { 2960 if (DBG) { 2961 System.out.println(this + " addView"); 2962 } 2963 2964 // addViewInner() will call child.requestLayout() when setting the new LayoutParams 2965 // therefore, we call requestLayout() on ourselves before, so that the child's request 2966 // will be blocked at our level 2967 requestLayout(); 2968 invalidate(true); 2969 addViewInner(child, index, params, false); 2970 } 2971 2972 /** 2973 * {@inheritDoc} 2974 */ 2975 public void updateViewLayout(View view, ViewGroup.LayoutParams params) { 2976 if (!checkLayoutParams(params)) { 2977 throw new IllegalArgumentException("Invalid LayoutParams supplied to " + this); 2978 } 2979 if (view.mParent != this) { 2980 throw new IllegalArgumentException("Given view not a child of " + this); 2981 } 2982 view.setLayoutParams(params); 2983 } 2984 2985 /** 2986 * {@inheritDoc} 2987 */ 2988 protected boolean checkLayoutParams(ViewGroup.LayoutParams p) { 2989 return p != null; 2990 } 2991 2992 /** 2993 * Interface definition for a callback to be invoked when the hierarchy 2994 * within this view changed. The hierarchy changes whenever a child is added 2995 * to or removed from this view. 2996 */ 2997 public interface OnHierarchyChangeListener { 2998 /** 2999 * Called when a new child is added to a parent view. 3000 * 3001 * @param parent the view in which a child was added 3002 * @param child the new child view added in the hierarchy 3003 */ 3004 void onChildViewAdded(View parent, View child); 3005 3006 /** 3007 * Called when a child is removed from a parent view. 3008 * 3009 * @param parent the view from which the child was removed 3010 * @param child the child removed from the hierarchy 3011 */ 3012 void onChildViewRemoved(View parent, View child); 3013 } 3014 3015 /** 3016 * Register a callback to be invoked when a child is added to or removed 3017 * from this view. 3018 * 3019 * @param listener the callback to invoke on hierarchy change 3020 */ 3021 public void setOnHierarchyChangeListener(OnHierarchyChangeListener listener) { 3022 mOnHierarchyChangeListener = listener; 3023 } 3024 3025 /** 3026 * Adds a view during layout. This is useful if in your onLayout() method, 3027 * you need to add more views (as does the list view for example). 3028 * 3029 * If index is negative, it means put it at the end of the list. 3030 * 3031 * @param child the view to add to the group 3032 * @param index the index at which the child must be added 3033 * @param params the layout parameters to associate with the child 3034 * @return true if the child was added, false otherwise 3035 */ 3036 protected boolean addViewInLayout(View child, int index, LayoutParams params) { 3037 return addViewInLayout(child, index, params, false); 3038 } 3039 3040 /** 3041 * Adds a view during layout. This is useful if in your onLayout() method, 3042 * you need to add more views (as does the list view for example). 3043 * 3044 * If index is negative, it means put it at the end of the list. 3045 * 3046 * @param child the view to add to the group 3047 * @param index the index at which the child must be added 3048 * @param params the layout parameters to associate with the child 3049 * @param preventRequestLayout if true, calling this method will not trigger a 3050 * layout request on child 3051 * @return true if the child was added, false otherwise 3052 */ 3053 protected boolean addViewInLayout(View child, int index, LayoutParams params, 3054 boolean preventRequestLayout) { 3055 child.mParent = null; 3056 addViewInner(child, index, params, preventRequestLayout); 3057 child.mPrivateFlags = (child.mPrivateFlags & ~DIRTY_MASK) | DRAWN; 3058 return true; 3059 } 3060 3061 /** 3062 * Prevents the specified child to be laid out during the next layout pass. 3063 * 3064 * @param child the child on which to perform the cleanup 3065 */ 3066 protected void cleanupLayoutState(View child) { 3067 child.mPrivateFlags &= ~View.FORCE_LAYOUT; 3068 } 3069 3070 private void addViewInner(View child, int index, LayoutParams params, 3071 boolean preventRequestLayout) { 3072 3073 if (mTransition != null) { 3074 // Don't prevent other add transitions from completing, but cancel remove 3075 // transitions to let them complete the process before we add to the container 3076 mTransition.cancel(LayoutTransition.DISAPPEARING); 3077 } 3078 3079 if (child.getParent() != null) { 3080 throw new IllegalStateException("The specified child already has a parent. " + 3081 "You must call removeView() on the child's parent first."); 3082 } 3083 3084 if (mTransition != null) { 3085 mTransition.addChild(this, child); 3086 } 3087 3088 if (!checkLayoutParams(params)) { 3089 params = generateLayoutParams(params); 3090 } 3091 3092 if (preventRequestLayout) { 3093 child.mLayoutParams = params; 3094 } else { 3095 child.setLayoutParams(params); 3096 } 3097 3098 if (index < 0) { 3099 index = mChildrenCount; 3100 } 3101 3102 addInArray(child, index); 3103 3104 // tell our children 3105 if (preventRequestLayout) { 3106 child.assignParent(this); 3107 } else { 3108 child.mParent = this; 3109 } 3110 3111 if (child.hasFocus()) { 3112 requestChildFocus(child, child.findFocus()); 3113 } 3114 3115 AttachInfo ai = mAttachInfo; 3116 if (ai != null) { 3117 boolean lastKeepOn = ai.mKeepScreenOn; 3118 ai.mKeepScreenOn = false; 3119 child.dispatchAttachedToWindow(mAttachInfo, (mViewFlags&VISIBILITY_MASK)); 3120 if (ai.mKeepScreenOn) { 3121 needGlobalAttributesUpdate(true); 3122 } 3123 ai.mKeepScreenOn = lastKeepOn; 3124 } 3125 3126 if (mOnHierarchyChangeListener != null) { 3127 mOnHierarchyChangeListener.onChildViewAdded(this, child); 3128 } 3129 3130 if ((child.mViewFlags & DUPLICATE_PARENT_STATE) == DUPLICATE_PARENT_STATE) { 3131 mGroupFlags |= FLAG_NOTIFY_CHILDREN_ON_DRAWABLE_STATE_CHANGE; 3132 } 3133 } 3134 3135 private void addInArray(View child, int index) { 3136 View[] children = mChildren; 3137 final int count = mChildrenCount; 3138 final int size = children.length; 3139 if (index == count) { 3140 if (size == count) { 3141 mChildren = new View[size + ARRAY_CAPACITY_INCREMENT]; 3142 System.arraycopy(children, 0, mChildren, 0, size); 3143 children = mChildren; 3144 } 3145 children[mChildrenCount++] = child; 3146 } else if (index < count) { 3147 if (size == count) { 3148 mChildren = new View[size + ARRAY_CAPACITY_INCREMENT]; 3149 System.arraycopy(children, 0, mChildren, 0, index); 3150 System.arraycopy(children, index, mChildren, index + 1, count - index); 3151 children = mChildren; 3152 } else { 3153 System.arraycopy(children, index, children, index + 1, count - index); 3154 } 3155 children[index] = child; 3156 mChildrenCount++; 3157 if (mLastTouchDownIndex >= index) { 3158 mLastTouchDownIndex++; 3159 } 3160 } else { 3161 throw new IndexOutOfBoundsException("index=" + index + " count=" + count); 3162 } 3163 } 3164 3165 // This method also sets the child's mParent to null 3166 private void removeFromArray(int index) { 3167 final View[] children = mChildren; 3168 if (!(mTransitioningViews != null && mTransitioningViews.contains(children[index]))) { 3169 children[index].mParent = null; 3170 } 3171 final int count = mChildrenCount; 3172 if (index == count - 1) { 3173 children[--mChildrenCount] = null; 3174 } else if (index >= 0 && index < count) { 3175 System.arraycopy(children, index + 1, children, index, count - index - 1); 3176 children[--mChildrenCount] = null; 3177 } else { 3178 throw new IndexOutOfBoundsException(); 3179 } 3180 if (mLastTouchDownIndex == index) { 3181 mLastTouchDownTime = 0; 3182 mLastTouchDownIndex = -1; 3183 } else if (mLastTouchDownIndex > index) { 3184 mLastTouchDownIndex--; 3185 } 3186 } 3187 3188 // This method also sets the children's mParent to null 3189 private void removeFromArray(int start, int count) { 3190 final View[] children = mChildren; 3191 final int childrenCount = mChildrenCount; 3192 3193 start = Math.max(0, start); 3194 final int end = Math.min(childrenCount, start + count); 3195 3196 if (start == end) { 3197 return; 3198 } 3199 3200 if (end == childrenCount) { 3201 for (int i = start; i < end; i++) { 3202 children[i].mParent = null; 3203 children[i] = null; 3204 } 3205 } else { 3206 for (int i = start; i < end; i++) { 3207 children[i].mParent = null; 3208 } 3209 3210 // Since we're looping above, we might as well do the copy, but is arraycopy() 3211 // faster than the extra 2 bounds checks we would do in the loop? 3212 System.arraycopy(children, end, children, start, childrenCount - end); 3213 3214 for (int i = childrenCount - (end - start); i < childrenCount; i++) { 3215 children[i] = null; 3216 } 3217 } 3218 3219 mChildrenCount -= (end - start); 3220 } 3221 3222 private void bindLayoutAnimation(View child) { 3223 Animation a = mLayoutAnimationController.getAnimationForView(child); 3224 child.setAnimation(a); 3225 } 3226 3227 /** 3228 * Subclasses should override this method to set layout animation 3229 * parameters on the supplied child. 3230 * 3231 * @param child the child to associate with animation parameters 3232 * @param params the child's layout parameters which hold the animation 3233 * parameters 3234 * @param index the index of the child in the view group 3235 * @param count the number of children in the view group 3236 */ 3237 protected void attachLayoutAnimationParameters(View child, 3238 LayoutParams params, int index, int count) { 3239 LayoutAnimationController.AnimationParameters animationParams = 3240 params.layoutAnimationParameters; 3241 if (animationParams == null) { 3242 animationParams = new LayoutAnimationController.AnimationParameters(); 3243 params.layoutAnimationParameters = animationParams; 3244 } 3245 3246 animationParams.count = count; 3247 animationParams.index = index; 3248 } 3249 3250 /** 3251 * {@inheritDoc} 3252 */ 3253 public void removeView(View view) { 3254 removeViewInternal(view); 3255 requestLayout(); 3256 invalidate(true); 3257 } 3258 3259 /** 3260 * Removes a view during layout. This is useful if in your onLayout() method, 3261 * you need to remove more views. 3262 * 3263 * @param view the view to remove from the group 3264 */ 3265 public void removeViewInLayout(View view) { 3266 removeViewInternal(view); 3267 } 3268 3269 /** 3270 * Removes a range of views during layout. This is useful if in your onLayout() method, 3271 * you need to remove more views. 3272 * 3273 * @param start the index of the first view to remove from the group 3274 * @param count the number of views to remove from the group 3275 */ 3276 public void removeViewsInLayout(int start, int count) { 3277 removeViewsInternal(start, count); 3278 } 3279 3280 /** 3281 * Removes the view at the specified position in the group. 3282 * 3283 * @param index the position in the group of the view to remove 3284 */ 3285 public void removeViewAt(int index) { 3286 removeViewInternal(index, getChildAt(index)); 3287 requestLayout(); 3288 invalidate(true); 3289 } 3290 3291 /** 3292 * Removes the specified range of views from the group. 3293 * 3294 * @param start the first position in the group of the range of views to remove 3295 * @param count the number of views to remove 3296 */ 3297 public void removeViews(int start, int count) { 3298 removeViewsInternal(start, count); 3299 requestLayout(); 3300 invalidate(true); 3301 } 3302 3303 private void removeViewInternal(View view) { 3304 final int index = indexOfChild(view); 3305 if (index >= 0) { 3306 removeViewInternal(index, view); 3307 } 3308 } 3309 3310 private void removeViewInternal(int index, View view) { 3311 3312 if (mTransition != null) { 3313 mTransition.removeChild(this, view); 3314 } 3315 3316 if (view == mHoveredChild) { 3317 mHoveredChild = null; 3318 } 3319 3320 boolean clearChildFocus = false; 3321 if (view == mFocused) { 3322 view.clearFocusForRemoval(); 3323 clearChildFocus = true; 3324 } 3325 3326 if (view.getAnimation() != null || 3327 (mTransitioningViews != null && mTransitioningViews.contains(view))) { 3328 addDisappearingView(view); 3329 } else if (view.mAttachInfo != null) { 3330 view.dispatchDetachedFromWindow(); 3331 } 3332 3333 if (mOnHierarchyChangeListener != null) { 3334 mOnHierarchyChangeListener.onChildViewRemoved(this, view); 3335 } 3336 3337 needGlobalAttributesUpdate(false); 3338 3339 removeFromArray(index); 3340 3341 if (clearChildFocus) { 3342 clearChildFocus(view); 3343 } 3344 } 3345 3346 /** 3347 * Sets the LayoutTransition object for this ViewGroup. If the LayoutTransition object is 3348 * not null, changes in layout which occur because of children being added to or removed from 3349 * the ViewGroup will be animated according to the animations defined in that LayoutTransition 3350 * object. By default, the transition object is null (so layout changes are not animated). 3351 * 3352 * @param transition The LayoutTransition object that will animated changes in layout. A value 3353 * of <code>null</code> means no transition will run on layout changes. 3354 * @attr ref android.R.styleable#ViewGroup_animateLayoutChanges 3355 */ 3356 public void setLayoutTransition(LayoutTransition transition) { 3357 if (mTransition != null) { 3358 mTransition.removeTransitionListener(mLayoutTransitionListener); 3359 } 3360 mTransition = transition; 3361 if (mTransition != null) { 3362 mTransition.addTransitionListener(mLayoutTransitionListener); 3363 } 3364 } 3365 3366 /** 3367 * Gets the LayoutTransition object for this ViewGroup. If the LayoutTransition object is 3368 * not null, changes in layout which occur because of children being added to or removed from 3369 * the ViewGroup will be animated according to the animations defined in that LayoutTransition 3370 * object. By default, the transition object is null (so layout changes are not animated). 3371 * 3372 * @return LayoutTranstion The LayoutTransition object that will animated changes in layout. 3373 * A value of <code>null</code> means no transition will run on layout changes. 3374 */ 3375 public LayoutTransition getLayoutTransition() { 3376 return mTransition; 3377 } 3378 3379 private void removeViewsInternal(int start, int count) { 3380 final OnHierarchyChangeListener onHierarchyChangeListener = mOnHierarchyChangeListener; 3381 final boolean notifyListener = onHierarchyChangeListener != null; 3382 final View focused = mFocused; 3383 final View hoveredChild = mHoveredChild; 3384 final boolean detach = mAttachInfo != null; 3385 View clearChildFocus = null; 3386 3387 final View[] children = mChildren; 3388 final int end = start + count; 3389 3390 for (int i = start; i < end; i++) { 3391 final View view = children[i]; 3392 3393 if (mTransition != null) { 3394 mTransition.removeChild(this, view); 3395 } 3396 3397 if (view == hoveredChild) { 3398 mHoveredChild = null; 3399 } 3400 3401 if (view == focused) { 3402 view.clearFocusForRemoval(); 3403 clearChildFocus = view; 3404 } 3405 3406 if (view.getAnimation() != null || 3407 (mTransitioningViews != null && mTransitioningViews.contains(view))) { 3408 addDisappearingView(view); 3409 } else if (detach) { 3410 view.dispatchDetachedFromWindow(); 3411 } 3412 3413 needGlobalAttributesUpdate(false); 3414 3415 if (notifyListener) { 3416 onHierarchyChangeListener.onChildViewRemoved(this, view); 3417 } 3418 } 3419 3420 removeFromArray(start, count); 3421 3422 if (clearChildFocus != null) { 3423 clearChildFocus(clearChildFocus); 3424 } 3425 } 3426 3427 /** 3428 * Call this method to remove all child views from the 3429 * ViewGroup. 3430 */ 3431 public void removeAllViews() { 3432 removeAllViewsInLayout(); 3433 requestLayout(); 3434 invalidate(true); 3435 } 3436 3437 /** 3438 * Called by a ViewGroup subclass to remove child views from itself, 3439 * when it must first know its size on screen before it can calculate how many 3440 * child views it will render. An example is a Gallery or a ListView, which 3441 * may "have" 50 children, but actually only render the number of children 3442 * that can currently fit inside the object on screen. Do not call 3443 * this method unless you are extending ViewGroup and understand the 3444 * view measuring and layout pipeline. 3445 */ 3446 public void removeAllViewsInLayout() { 3447 final int count = mChildrenCount; 3448 if (count <= 0) { 3449 return; 3450 } 3451 3452 final View[] children = mChildren; 3453 mChildrenCount = 0; 3454 3455 final OnHierarchyChangeListener listener = mOnHierarchyChangeListener; 3456 final boolean notify = listener != null; 3457 final View focused = mFocused; 3458 final View hoveredChild = mHoveredChild; 3459 final boolean detach = mAttachInfo != null; 3460 View clearChildFocus = null; 3461 3462 needGlobalAttributesUpdate(false); 3463 3464 for (int i = count - 1; i >= 0; i--) { 3465 final View view = children[i]; 3466 3467 if (mTransition != null) { 3468 mTransition.removeChild(this, view); 3469 } 3470 3471 if (view == hoveredChild) { 3472 mHoveredChild = null; 3473 } 3474 3475 if (view == focused) { 3476 view.clearFocusForRemoval(); 3477 clearChildFocus = view; 3478 } 3479 3480 if (view.getAnimation() != null || 3481 (mTransitioningViews != null && mTransitioningViews.contains(view))) { 3482 addDisappearingView(view); 3483 } else if (detach) { 3484 view.dispatchDetachedFromWindow(); 3485 } 3486 3487 if (notify) { 3488 listener.onChildViewRemoved(this, view); 3489 } 3490 3491 view.mParent = null; 3492 children[i] = null; 3493 } 3494 3495 if (clearChildFocus != null) { 3496 clearChildFocus(clearChildFocus); 3497 } 3498 } 3499 3500 /** 3501 * Finishes the removal of a detached view. This method will dispatch the detached from 3502 * window event and notify the hierarchy change listener. 3503 * 3504 * @param child the child to be definitely removed from the view hierarchy 3505 * @param animate if true and the view has an animation, the view is placed in the 3506 * disappearing views list, otherwise, it is detached from the window 3507 * 3508 * @see #attachViewToParent(View, int, android.view.ViewGroup.LayoutParams) 3509 * @see #detachAllViewsFromParent() 3510 * @see #detachViewFromParent(View) 3511 * @see #detachViewFromParent(int) 3512 */ 3513 protected void removeDetachedView(View child, boolean animate) { 3514 if (mTransition != null) { 3515 mTransition.removeChild(this, child); 3516 } 3517 3518 if (child == mFocused) { 3519 child.clearFocus(); 3520 } 3521 3522 if ((animate && child.getAnimation() != null) || 3523 (mTransitioningViews != null && mTransitioningViews.contains(child))) { 3524 addDisappearingView(child); 3525 } else if (child.mAttachInfo != null) { 3526 child.dispatchDetachedFromWindow(); 3527 } 3528 3529 if (mOnHierarchyChangeListener != null) { 3530 mOnHierarchyChangeListener.onChildViewRemoved(this, child); 3531 } 3532 } 3533 3534 /** 3535 * Attaches a view to this view group. Attaching a view assigns this group as the parent, 3536 * sets the layout parameters and puts the view in the list of children so it can be retrieved 3537 * by calling {@link #getChildAt(int)}. 3538 * 3539 * This method should be called only for view which were detached from their parent. 3540 * 3541 * @param child the child to attach 3542 * @param index the index at which the child should be attached 3543 * @param params the layout parameters of the child 3544 * 3545 * @see #removeDetachedView(View, boolean) 3546 * @see #detachAllViewsFromParent() 3547 * @see #detachViewFromParent(View) 3548 * @see #detachViewFromParent(int) 3549 */ 3550 protected void attachViewToParent(View child, int index, LayoutParams params) { 3551 child.mLayoutParams = params; 3552 3553 if (index < 0) { 3554 index = mChildrenCount; 3555 } 3556 3557 addInArray(child, index); 3558 3559 child.mParent = this; 3560 child.mPrivateFlags = (child.mPrivateFlags & ~DIRTY_MASK & ~DRAWING_CACHE_VALID) | 3561 DRAWN | INVALIDATED; 3562 this.mPrivateFlags |= INVALIDATED; 3563 3564 if (child.hasFocus()) { 3565 requestChildFocus(child, child.findFocus()); 3566 } 3567 } 3568 3569 /** 3570 * Detaches a view from its parent. Detaching a view should be temporary and followed 3571 * either by a call to {@link #attachViewToParent(View, int, android.view.ViewGroup.LayoutParams)} 3572 * or a call to {@link #removeDetachedView(View, boolean)}. When a view is detached, 3573 * its parent is null and cannot be retrieved by a call to {@link #getChildAt(int)}. 3574 * 3575 * @param child the child to detach 3576 * 3577 * @see #detachViewFromParent(int) 3578 * @see #detachViewsFromParent(int, int) 3579 * @see #detachAllViewsFromParent() 3580 * @see #attachViewToParent(View, int, android.view.ViewGroup.LayoutParams) 3581 * @see #removeDetachedView(View, boolean) 3582 */ 3583 protected void detachViewFromParent(View child) { 3584 removeFromArray(indexOfChild(child)); 3585 } 3586 3587 /** 3588 * Detaches a view from its parent. Detaching a view should be temporary and followed 3589 * either by a call to {@link #attachViewToParent(View, int, android.view.ViewGroup.LayoutParams)} 3590 * or a call to {@link #removeDetachedView(View, boolean)}. When a view is detached, 3591 * its parent is null and cannot be retrieved by a call to {@link #getChildAt(int)}. 3592 * 3593 * @param index the index of the child to detach 3594 * 3595 * @see #detachViewFromParent(View) 3596 * @see #detachAllViewsFromParent() 3597 * @see #detachViewsFromParent(int, int) 3598 * @see #attachViewToParent(View, int, android.view.ViewGroup.LayoutParams) 3599 * @see #removeDetachedView(View, boolean) 3600 */ 3601 protected void detachViewFromParent(int index) { 3602 removeFromArray(index); 3603 } 3604 3605 /** 3606 * Detaches a range of view from their parent. Detaching a view should be temporary and followed 3607 * either by a call to {@link #attachViewToParent(View, int, android.view.ViewGroup.LayoutParams)} 3608 * or a call to {@link #removeDetachedView(View, boolean)}. When a view is detached, its 3609 * parent is null and cannot be retrieved by a call to {@link #getChildAt(int)}. 3610 * 3611 * @param start the first index of the childrend range to detach 3612 * @param count the number of children to detach 3613 * 3614 * @see #detachViewFromParent(View) 3615 * @see #detachViewFromParent(int) 3616 * @see #detachAllViewsFromParent() 3617 * @see #attachViewToParent(View, int, android.view.ViewGroup.LayoutParams) 3618 * @see #removeDetachedView(View, boolean) 3619 */ 3620 protected void detachViewsFromParent(int start, int count) { 3621 removeFromArray(start, count); 3622 } 3623 3624 /** 3625 * Detaches all views from the parent. Detaching a view should be temporary and followed 3626 * either by a call to {@link #attachViewToParent(View, int, android.view.ViewGroup.LayoutParams)} 3627 * or a call to {@link #removeDetachedView(View, boolean)}. When a view is detached, 3628 * its parent is null and cannot be retrieved by a call to {@link #getChildAt(int)}. 3629 * 3630 * @see #detachViewFromParent(View) 3631 * @see #detachViewFromParent(int) 3632 * @see #detachViewsFromParent(int, int) 3633 * @see #attachViewToParent(View, int, android.view.ViewGroup.LayoutParams) 3634 * @see #removeDetachedView(View, boolean) 3635 */ 3636 protected void detachAllViewsFromParent() { 3637 final int count = mChildrenCount; 3638 if (count <= 0) { 3639 return; 3640 } 3641 3642 final View[] children = mChildren; 3643 mChildrenCount = 0; 3644 3645 for (int i = count - 1; i >= 0; i--) { 3646 children[i].mParent = null; 3647 children[i] = null; 3648 } 3649 } 3650 3651 /** 3652 * Don't call or override this method. It is used for the implementation of 3653 * the view hierarchy. 3654 */ 3655 public final void invalidateChild(View child, final Rect dirty) { 3656 if (ViewDebug.TRACE_HIERARCHY) { 3657 ViewDebug.trace(this, ViewDebug.HierarchyTraceType.INVALIDATE_CHILD); 3658 } 3659 3660 ViewParent parent = this; 3661 3662 final AttachInfo attachInfo = mAttachInfo; 3663 if (attachInfo != null) { 3664 // If the child is drawing an animation, we want to copy this flag onto 3665 // ourselves and the parent to make sure the invalidate request goes 3666 // through 3667 final boolean drawAnimation = (child.mPrivateFlags & DRAW_ANIMATION) == DRAW_ANIMATION; 3668 3669 if (dirty == null) { 3670 if (child.mLayerType != LAYER_TYPE_NONE) { 3671 mPrivateFlags |= INVALIDATED; 3672 mPrivateFlags &= ~DRAWING_CACHE_VALID; 3673 child.mLocalDirtyRect.setEmpty(); 3674 } 3675 do { 3676 View view = null; 3677 if (parent instanceof View) { 3678 view = (View) parent; 3679 if (view.mLayerType != LAYER_TYPE_NONE) { 3680 view.mLocalDirtyRect.setEmpty(); 3681 if (view.getParent() instanceof View) { 3682 final View grandParent = (View) view.getParent(); 3683 grandParent.mPrivateFlags |= INVALIDATED; 3684 grandParent.mPrivateFlags &= ~DRAWING_CACHE_VALID; 3685 } 3686 } 3687 if ((view.mPrivateFlags & DIRTY_MASK) != 0) { 3688 // already marked dirty - we're done 3689 break; 3690 } 3691 } 3692 3693 if (drawAnimation) { 3694 if (view != null) { 3695 view.mPrivateFlags |= DRAW_ANIMATION; 3696 } else if (parent instanceof ViewAncestor) { 3697 ((ViewAncestor) parent).mIsAnimating = true; 3698 } 3699 } 3700 3701 if (parent instanceof ViewAncestor) { 3702 ((ViewAncestor) parent).invalidate(); 3703 parent = null; 3704 } else if (view != null) { 3705 if ((view.mPrivateFlags & DRAWN) == DRAWN || 3706 (view.mPrivateFlags & DRAWING_CACHE_VALID) == DRAWING_CACHE_VALID) { 3707 view.mPrivateFlags &= ~DRAWING_CACHE_VALID; 3708 view.mPrivateFlags |= DIRTY; 3709 parent = view.mParent; 3710 } else { 3711 parent = null; 3712 } 3713 } 3714 } while (parent != null); 3715 } else { 3716 // Check whether the child that requests the invalidate is fully opaque 3717 final boolean isOpaque = child.isOpaque() && !drawAnimation && 3718 child.getAnimation() == null; 3719 // Mark the child as dirty, using the appropriate flag 3720 // Make sure we do not set both flags at the same time 3721 int opaqueFlag = isOpaque ? DIRTY_OPAQUE : DIRTY; 3722 3723 if (child.mLayerType != LAYER_TYPE_NONE) { 3724 mPrivateFlags |= INVALIDATED; 3725 mPrivateFlags &= ~DRAWING_CACHE_VALID; 3726 child.mLocalDirtyRect.union(dirty); 3727 } 3728 3729 final int[] location = attachInfo.mInvalidateChildLocation; 3730 location[CHILD_LEFT_INDEX] = child.mLeft; 3731 location[CHILD_TOP_INDEX] = child.mTop; 3732 Matrix childMatrix = child.getMatrix(); 3733 if (!childMatrix.isIdentity()) { 3734 RectF boundingRect = attachInfo.mTmpTransformRect; 3735 boundingRect.set(dirty); 3736 childMatrix.mapRect(boundingRect); 3737 dirty.set((int) boundingRect.left, (int) boundingRect.top, 3738 (int) (boundingRect.right + 0.5f), 3739 (int) (boundingRect.bottom + 0.5f)); 3740 } 3741 3742 do { 3743 View view = null; 3744 if (parent instanceof View) { 3745 view = (View) parent; 3746 if (view.mLayerType != LAYER_TYPE_NONE && 3747 view.getParent() instanceof View) { 3748 final View grandParent = (View) view.getParent(); 3749 grandParent.mPrivateFlags |= INVALIDATED; 3750 grandParent.mPrivateFlags &= ~DRAWING_CACHE_VALID; 3751 } 3752 } 3753 3754 if (drawAnimation) { 3755 if (view != null) { 3756 view.mPrivateFlags |= DRAW_ANIMATION; 3757 } else if (parent instanceof ViewAncestor) { 3758 ((ViewAncestor) parent).mIsAnimating = true; 3759 } 3760 } 3761 3762 // If the parent is dirty opaque or not dirty, mark it dirty with the opaque 3763 // flag coming from the child that initiated the invalidate 3764 if (view != null) { 3765 if ((view.mViewFlags & FADING_EDGE_MASK) != 0 && 3766 view.getSolidColor() == 0) { 3767 opaqueFlag = DIRTY; 3768 } 3769 if ((view.mPrivateFlags & DIRTY_MASK) != DIRTY) { 3770 view.mPrivateFlags = (view.mPrivateFlags & ~DIRTY_MASK) | opaqueFlag; 3771 } 3772 } 3773 3774 parent = parent.invalidateChildInParent(location, dirty); 3775 if (view != null) { 3776 // Account for transform on current parent 3777 Matrix m = view.getMatrix(); 3778 if (!m.isIdentity()) { 3779 RectF boundingRect = attachInfo.mTmpTransformRect; 3780 boundingRect.set(dirty); 3781 m.mapRect(boundingRect); 3782 dirty.set((int) boundingRect.left, (int) boundingRect.top, 3783 (int) (boundingRect.right + 0.5f), 3784 (int) (boundingRect.bottom + 0.5f)); 3785 } 3786 } 3787 } while (parent != null); 3788 } 3789 } 3790 } 3791 3792 /** 3793 * Don't call or override this method. It is used for the implementation of 3794 * the view hierarchy. 3795 * 3796 * This implementation returns null if this ViewGroup does not have a parent, 3797 * if this ViewGroup is already fully invalidated or if the dirty rectangle 3798 * does not intersect with this ViewGroup's bounds. 3799 */ 3800 public ViewParent invalidateChildInParent(final int[] location, final Rect dirty) { 3801 if (ViewDebug.TRACE_HIERARCHY) { 3802 ViewDebug.trace(this, ViewDebug.HierarchyTraceType.INVALIDATE_CHILD_IN_PARENT); 3803 } 3804 3805 if ((mPrivateFlags & DRAWN) == DRAWN || 3806 (mPrivateFlags & DRAWING_CACHE_VALID) == DRAWING_CACHE_VALID) { 3807 if ((mGroupFlags & (FLAG_OPTIMIZE_INVALIDATE | FLAG_ANIMATION_DONE)) != 3808 FLAG_OPTIMIZE_INVALIDATE) { 3809 dirty.offset(location[CHILD_LEFT_INDEX] - mScrollX, 3810 location[CHILD_TOP_INDEX] - mScrollY); 3811 3812 final int left = mLeft; 3813 final int top = mTop; 3814 3815 if (dirty.intersect(0, 0, mRight - left, mBottom - top) || 3816 (mPrivateFlags & DRAW_ANIMATION) == DRAW_ANIMATION) { 3817 mPrivateFlags &= ~DRAWING_CACHE_VALID; 3818 3819 location[CHILD_LEFT_INDEX] = left; 3820 location[CHILD_TOP_INDEX] = top; 3821 3822 if (mLayerType != LAYER_TYPE_NONE) { 3823 mLocalDirtyRect.union(dirty); 3824 } 3825 3826 return mParent; 3827 } 3828 } else { 3829 mPrivateFlags &= ~DRAWN & ~DRAWING_CACHE_VALID; 3830 3831 location[CHILD_LEFT_INDEX] = mLeft; 3832 location[CHILD_TOP_INDEX] = mTop; 3833 3834 dirty.set(0, 0, mRight - mLeft, mBottom - mTop); 3835 3836 if (mLayerType != LAYER_TYPE_NONE) { 3837 mLocalDirtyRect.union(dirty); 3838 } 3839 3840 return mParent; 3841 } 3842 } 3843 3844 return null; 3845 } 3846 3847 /** 3848 * Offset a rectangle that is in a descendant's coordinate 3849 * space into our coordinate space. 3850 * @param descendant A descendant of this view 3851 * @param rect A rectangle defined in descendant's coordinate space. 3852 */ 3853 public final void offsetDescendantRectToMyCoords(View descendant, Rect rect) { 3854 offsetRectBetweenParentAndChild(descendant, rect, true, false); 3855 } 3856 3857 /** 3858 * Offset a rectangle that is in our coordinate space into an ancestor's 3859 * coordinate space. 3860 * @param descendant A descendant of this view 3861 * @param rect A rectangle defined in descendant's coordinate space. 3862 */ 3863 public final void offsetRectIntoDescendantCoords(View descendant, Rect rect) { 3864 offsetRectBetweenParentAndChild(descendant, rect, false, false); 3865 } 3866 3867 /** 3868 * Helper method that offsets a rect either from parent to descendant or 3869 * descendant to parent. 3870 */ 3871 void offsetRectBetweenParentAndChild(View descendant, Rect rect, 3872 boolean offsetFromChildToParent, boolean clipToBounds) { 3873 3874 // already in the same coord system :) 3875 if (descendant == this) { 3876 return; 3877 } 3878 3879 ViewParent theParent = descendant.mParent; 3880 3881 // search and offset up to the parent 3882 while ((theParent != null) 3883 && (theParent instanceof View) 3884 && (theParent != this)) { 3885 3886 if (offsetFromChildToParent) { 3887 rect.offset(descendant.mLeft - descendant.mScrollX, 3888 descendant.mTop - descendant.mScrollY); 3889 if (clipToBounds) { 3890 View p = (View) theParent; 3891 rect.intersect(0, 0, p.mRight - p.mLeft, p.mBottom - p.mTop); 3892 } 3893 } else { 3894 if (clipToBounds) { 3895 View p = (View) theParent; 3896 rect.intersect(0, 0, p.mRight - p.mLeft, p.mBottom - p.mTop); 3897 } 3898 rect.offset(descendant.mScrollX - descendant.mLeft, 3899 descendant.mScrollY - descendant.mTop); 3900 } 3901 3902 descendant = (View) theParent; 3903 theParent = descendant.mParent; 3904 } 3905 3906 // now that we are up to this view, need to offset one more time 3907 // to get into our coordinate space 3908 if (theParent == this) { 3909 if (offsetFromChildToParent) { 3910 rect.offset(descendant.mLeft - descendant.mScrollX, 3911 descendant.mTop - descendant.mScrollY); 3912 } else { 3913 rect.offset(descendant.mScrollX - descendant.mLeft, 3914 descendant.mScrollY - descendant.mTop); 3915 } 3916 } else { 3917 throw new IllegalArgumentException("parameter must be a descendant of this view"); 3918 } 3919 } 3920 3921 /** 3922 * Offset the vertical location of all children of this view by the specified number of pixels. 3923 * 3924 * @param offset the number of pixels to offset 3925 * 3926 * @hide 3927 */ 3928 public void offsetChildrenTopAndBottom(int offset) { 3929 final int count = mChildrenCount; 3930 final View[] children = mChildren; 3931 3932 for (int i = 0; i < count; i++) { 3933 final View v = children[i]; 3934 v.mTop += offset; 3935 v.mBottom += offset; 3936 } 3937 } 3938 3939 /** 3940 * {@inheritDoc} 3941 */ 3942 public boolean getChildVisibleRect(View child, Rect r, android.graphics.Point offset) { 3943 int dx = child.mLeft - mScrollX; 3944 int dy = child.mTop - mScrollY; 3945 if (offset != null) { 3946 offset.x += dx; 3947 offset.y += dy; 3948 } 3949 r.offset(dx, dy); 3950 return r.intersect(0, 0, mRight - mLeft, mBottom - mTop) && 3951 (mParent == null || mParent.getChildVisibleRect(this, r, offset)); 3952 } 3953 3954 /** 3955 * {@inheritDoc} 3956 */ 3957 @Override 3958 public final void layout(int l, int t, int r, int b) { 3959 if (mTransition == null || !mTransition.isChangingLayout()) { 3960 super.layout(l, t, r, b); 3961 } else { 3962 // record the fact that we noop'd it; request layout when transition finishes 3963 mLayoutSuppressed = true; 3964 } 3965 } 3966 3967 /** 3968 * {@inheritDoc} 3969 */ 3970 @Override 3971 protected abstract void onLayout(boolean changed, 3972 int l, int t, int r, int b); 3973 3974 /** 3975 * Indicates whether the view group has the ability to animate its children 3976 * after the first layout. 3977 * 3978 * @return true if the children can be animated, false otherwise 3979 */ 3980 protected boolean canAnimate() { 3981 return mLayoutAnimationController != null; 3982 } 3983 3984 /** 3985 * Runs the layout animation. Calling this method triggers a relayout of 3986 * this view group. 3987 */ 3988 public void startLayoutAnimation() { 3989 if (mLayoutAnimationController != null) { 3990 mGroupFlags |= FLAG_RUN_ANIMATION; 3991 requestLayout(); 3992 } 3993 } 3994 3995 /** 3996 * Schedules the layout animation to be played after the next layout pass 3997 * of this view group. This can be used to restart the layout animation 3998 * when the content of the view group changes or when the activity is 3999 * paused and resumed. 4000 */ 4001 public void scheduleLayoutAnimation() { 4002 mGroupFlags |= FLAG_RUN_ANIMATION; 4003 } 4004 4005 /** 4006 * Sets the layout animation controller used to animate the group's 4007 * children after the first layout. 4008 * 4009 * @param controller the animation controller 4010 */ 4011 public void setLayoutAnimation(LayoutAnimationController controller) { 4012 mLayoutAnimationController = controller; 4013 if (mLayoutAnimationController != null) { 4014 mGroupFlags |= FLAG_RUN_ANIMATION; 4015 } 4016 } 4017 4018 /** 4019 * Returns the layout animation controller used to animate the group's 4020 * children. 4021 * 4022 * @return the current animation controller 4023 */ 4024 public LayoutAnimationController getLayoutAnimation() { 4025 return mLayoutAnimationController; 4026 } 4027 4028 /** 4029 * Indicates whether the children's drawing cache is used during a layout 4030 * animation. By default, the drawing cache is enabled but this will prevent 4031 * nested layout animations from working. To nest animations, you must disable 4032 * the cache. 4033 * 4034 * @return true if the animation cache is enabled, false otherwise 4035 * 4036 * @see #setAnimationCacheEnabled(boolean) 4037 * @see View#setDrawingCacheEnabled(boolean) 4038 */ 4039 @ViewDebug.ExportedProperty 4040 public boolean isAnimationCacheEnabled() { 4041 return (mGroupFlags & FLAG_ANIMATION_CACHE) == FLAG_ANIMATION_CACHE; 4042 } 4043 4044 /** 4045 * Enables or disables the children's drawing cache during a layout animation. 4046 * By default, the drawing cache is enabled but this will prevent nested 4047 * layout animations from working. To nest animations, you must disable the 4048 * cache. 4049 * 4050 * @param enabled true to enable the animation cache, false otherwise 4051 * 4052 * @see #isAnimationCacheEnabled() 4053 * @see View#setDrawingCacheEnabled(boolean) 4054 */ 4055 public void setAnimationCacheEnabled(boolean enabled) { 4056 setBooleanFlag(FLAG_ANIMATION_CACHE, enabled); 4057 } 4058 4059 /** 4060 * Indicates whether this ViewGroup will always try to draw its children using their 4061 * drawing cache. By default this property is enabled. 4062 * 4063 * @return true if the animation cache is enabled, false otherwise 4064 * 4065 * @see #setAlwaysDrawnWithCacheEnabled(boolean) 4066 * @see #setChildrenDrawnWithCacheEnabled(boolean) 4067 * @see View#setDrawingCacheEnabled(boolean) 4068 */ 4069 @ViewDebug.ExportedProperty(category = "drawing") 4070 public boolean isAlwaysDrawnWithCacheEnabled() { 4071 return (mGroupFlags & FLAG_ALWAYS_DRAWN_WITH_CACHE) == FLAG_ALWAYS_DRAWN_WITH_CACHE; 4072 } 4073 4074 /** 4075 * Indicates whether this ViewGroup will always try to draw its children using their 4076 * drawing cache. This property can be set to true when the cache rendering is 4077 * slightly different from the children's normal rendering. Renderings can be different, 4078 * for instance, when the cache's quality is set to low. 4079 * 4080 * When this property is disabled, the ViewGroup will use the drawing cache of its 4081 * children only when asked to. It's usually the task of subclasses to tell ViewGroup 4082 * when to start using the drawing cache and when to stop using it. 4083 * 4084 * @param always true to always draw with the drawing cache, false otherwise 4085 * 4086 * @see #isAlwaysDrawnWithCacheEnabled() 4087 * @see #setChildrenDrawnWithCacheEnabled(boolean) 4088 * @see View#setDrawingCacheEnabled(boolean) 4089 * @see View#setDrawingCacheQuality(int) 4090 */ 4091 public void setAlwaysDrawnWithCacheEnabled(boolean always) { 4092 setBooleanFlag(FLAG_ALWAYS_DRAWN_WITH_CACHE, always); 4093 } 4094 4095 /** 4096 * Indicates whether the ViewGroup is currently drawing its children using 4097 * their drawing cache. 4098 * 4099 * @return true if children should be drawn with their cache, false otherwise 4100 * 4101 * @see #setAlwaysDrawnWithCacheEnabled(boolean) 4102 * @see #setChildrenDrawnWithCacheEnabled(boolean) 4103 */ 4104 @ViewDebug.ExportedProperty(category = "drawing") 4105 protected boolean isChildrenDrawnWithCacheEnabled() { 4106 return (mGroupFlags & FLAG_CHILDREN_DRAWN_WITH_CACHE) == FLAG_CHILDREN_DRAWN_WITH_CACHE; 4107 } 4108 4109 /** 4110 * Tells the ViewGroup to draw its children using their drawing cache. This property 4111 * is ignored when {@link #isAlwaysDrawnWithCacheEnabled()} is true. A child's drawing cache 4112 * will be used only if it has been enabled. 4113 * 4114 * Subclasses should call this method to start and stop using the drawing cache when 4115 * they perform performance sensitive operations, like scrolling or animating. 4116 * 4117 * @param enabled true if children should be drawn with their cache, false otherwise 4118 * 4119 * @see #setAlwaysDrawnWithCacheEnabled(boolean) 4120 * @see #isChildrenDrawnWithCacheEnabled() 4121 */ 4122 protected void setChildrenDrawnWithCacheEnabled(boolean enabled) { 4123 setBooleanFlag(FLAG_CHILDREN_DRAWN_WITH_CACHE, enabled); 4124 } 4125 4126 /** 4127 * Indicates whether the ViewGroup is drawing its children in the order defined by 4128 * {@link #getChildDrawingOrder(int, int)}. 4129 * 4130 * @return true if children drawing order is defined by {@link #getChildDrawingOrder(int, int)}, 4131 * false otherwise 4132 * 4133 * @see #setChildrenDrawingOrderEnabled(boolean) 4134 * @see #getChildDrawingOrder(int, int) 4135 */ 4136 @ViewDebug.ExportedProperty(category = "drawing") 4137 protected boolean isChildrenDrawingOrderEnabled() { 4138 return (mGroupFlags & FLAG_USE_CHILD_DRAWING_ORDER) == FLAG_USE_CHILD_DRAWING_ORDER; 4139 } 4140 4141 /** 4142 * Tells the ViewGroup whether to draw its children in the order defined by the method 4143 * {@link #getChildDrawingOrder(int, int)}. 4144 * 4145 * @param enabled true if the order of the children when drawing is determined by 4146 * {@link #getChildDrawingOrder(int, int)}, false otherwise 4147 * 4148 * @see #isChildrenDrawingOrderEnabled() 4149 * @see #getChildDrawingOrder(int, int) 4150 */ 4151 protected void setChildrenDrawingOrderEnabled(boolean enabled) { 4152 setBooleanFlag(FLAG_USE_CHILD_DRAWING_ORDER, enabled); 4153 } 4154 4155 private void setBooleanFlag(int flag, boolean value) { 4156 if (value) { 4157 mGroupFlags |= flag; 4158 } else { 4159 mGroupFlags &= ~flag; 4160 } 4161 } 4162 4163 /** 4164 * Returns an integer indicating what types of drawing caches are kept in memory. 4165 * 4166 * @see #setPersistentDrawingCache(int) 4167 * @see #setAnimationCacheEnabled(boolean) 4168 * 4169 * @return one or a combination of {@link #PERSISTENT_NO_CACHE}, 4170 * {@link #PERSISTENT_ANIMATION_CACHE}, {@link #PERSISTENT_SCROLLING_CACHE} 4171 * and {@link #PERSISTENT_ALL_CACHES} 4172 */ 4173 @ViewDebug.ExportedProperty(category = "drawing", mapping = { 4174 @ViewDebug.IntToString(from = PERSISTENT_NO_CACHE, to = "NONE"), 4175 @ViewDebug.IntToString(from = PERSISTENT_ANIMATION_CACHE, to = "ANIMATION"), 4176 @ViewDebug.IntToString(from = PERSISTENT_SCROLLING_CACHE, to = "SCROLLING"), 4177 @ViewDebug.IntToString(from = PERSISTENT_ALL_CACHES, to = "ALL") 4178 }) 4179 public int getPersistentDrawingCache() { 4180 return mPersistentDrawingCache; 4181 } 4182 4183 /** 4184 * Indicates what types of drawing caches should be kept in memory after 4185 * they have been created. 4186 * 4187 * @see #getPersistentDrawingCache() 4188 * @see #setAnimationCacheEnabled(boolean) 4189 * 4190 * @param drawingCacheToKeep one or a combination of {@link #PERSISTENT_NO_CACHE}, 4191 * {@link #PERSISTENT_ANIMATION_CACHE}, {@link #PERSISTENT_SCROLLING_CACHE} 4192 * and {@link #PERSISTENT_ALL_CACHES} 4193 */ 4194 public void setPersistentDrawingCache(int drawingCacheToKeep) { 4195 mPersistentDrawingCache = drawingCacheToKeep & PERSISTENT_ALL_CACHES; 4196 } 4197 4198 /** 4199 * Returns a new set of layout parameters based on the supplied attributes set. 4200 * 4201 * @param attrs the attributes to build the layout parameters from 4202 * 4203 * @return an instance of {@link android.view.ViewGroup.LayoutParams} or one 4204 * of its descendants 4205 */ 4206 public LayoutParams generateLayoutParams(AttributeSet attrs) { 4207 return new LayoutParams(getContext(), attrs); 4208 } 4209 4210 /** 4211 * Returns a safe set of layout parameters based on the supplied layout params. 4212 * When a ViewGroup is passed a View whose layout params do not pass the test of 4213 * {@link #checkLayoutParams(android.view.ViewGroup.LayoutParams)}, this method 4214 * is invoked. This method should return a new set of layout params suitable for 4215 * this ViewGroup, possibly by copying the appropriate attributes from the 4216 * specified set of layout params. 4217 * 4218 * @param p The layout parameters to convert into a suitable set of layout parameters 4219 * for this ViewGroup. 4220 * 4221 * @return an instance of {@link android.view.ViewGroup.LayoutParams} or one 4222 * of its descendants 4223 */ 4224 protected LayoutParams generateLayoutParams(ViewGroup.LayoutParams p) { 4225 return p; 4226 } 4227 4228 /** 4229 * Returns a set of default layout parameters. These parameters are requested 4230 * when the View passed to {@link #addView(View)} has no layout parameters 4231 * already set. If null is returned, an exception is thrown from addView. 4232 * 4233 * @return a set of default layout parameters or null 4234 */ 4235 protected LayoutParams generateDefaultLayoutParams() { 4236 return new LayoutParams(LayoutParams.WRAP_CONTENT, LayoutParams.WRAP_CONTENT); 4237 } 4238 4239 /** 4240 * @hide 4241 */ 4242 @Override 4243 protected boolean dispatchConsistencyCheck(int consistency) { 4244 boolean result = super.dispatchConsistencyCheck(consistency); 4245 4246 final int count = mChildrenCount; 4247 final View[] children = mChildren; 4248 for (int i = 0; i < count; i++) { 4249 if (!children[i].dispatchConsistencyCheck(consistency)) result = false; 4250 } 4251 4252 return result; 4253 } 4254 4255 /** 4256 * @hide 4257 */ 4258 @Override 4259 protected boolean onConsistencyCheck(int consistency) { 4260 boolean result = super.onConsistencyCheck(consistency); 4261 4262 final boolean checkLayout = (consistency & ViewDebug.CONSISTENCY_LAYOUT) != 0; 4263 final boolean checkDrawing = (consistency & ViewDebug.CONSISTENCY_DRAWING) != 0; 4264 4265 if (checkLayout) { 4266 final int count = mChildrenCount; 4267 final View[] children = mChildren; 4268 for (int i = 0; i < count; i++) { 4269 if (children[i].getParent() != this) { 4270 result = false; 4271 android.util.Log.d(ViewDebug.CONSISTENCY_LOG_TAG, 4272 "View " + children[i] + " has no parent/a parent that is not " + this); 4273 } 4274 } 4275 } 4276 4277 if (checkDrawing) { 4278 // If this group is dirty, check that the parent is dirty as well 4279 if ((mPrivateFlags & DIRTY_MASK) != 0) { 4280 final ViewParent parent = getParent(); 4281 if (parent != null && !(parent instanceof ViewAncestor)) { 4282 if ((((View) parent).mPrivateFlags & DIRTY_MASK) == 0) { 4283 result = false; 4284 android.util.Log.d(ViewDebug.CONSISTENCY_LOG_TAG, 4285 "ViewGroup " + this + " is dirty but its parent is not: " + this); 4286 } 4287 } 4288 } 4289 } 4290 4291 return result; 4292 } 4293 4294 /** 4295 * {@inheritDoc} 4296 */ 4297 @Override 4298 protected void debug(int depth) { 4299 super.debug(depth); 4300 String output; 4301 4302 if (mFocused != null) { 4303 output = debugIndent(depth); 4304 output += "mFocused"; 4305 Log.d(VIEW_LOG_TAG, output); 4306 } 4307 if (mChildrenCount != 0) { 4308 output = debugIndent(depth); 4309 output += "{"; 4310 Log.d(VIEW_LOG_TAG, output); 4311 } 4312 int count = mChildrenCount; 4313 for (int i = 0; i < count; i++) { 4314 View child = mChildren[i]; 4315 child.debug(depth + 1); 4316 } 4317 4318 if (mChildrenCount != 0) { 4319 output = debugIndent(depth); 4320 output += "}"; 4321 Log.d(VIEW_LOG_TAG, output); 4322 } 4323 } 4324 4325 /** 4326 * Returns the position in the group of the specified child view. 4327 * 4328 * @param child the view for which to get the position 4329 * @return a positive integer representing the position of the view in the 4330 * group, or -1 if the view does not exist in the group 4331 */ 4332 public int indexOfChild(View child) { 4333 final int count = mChildrenCount; 4334 final View[] children = mChildren; 4335 for (int i = 0; i < count; i++) { 4336 if (children[i] == child) { 4337 return i; 4338 } 4339 } 4340 return -1; 4341 } 4342 4343 /** 4344 * Returns the number of children in the group. 4345 * 4346 * @return a positive integer representing the number of children in 4347 * the group 4348 */ 4349 public int getChildCount() { 4350 return mChildrenCount; 4351 } 4352 4353 /** 4354 * Returns the view at the specified position in the group. 4355 * 4356 * @param index the position at which to get the view from 4357 * @return the view at the specified position or null if the position 4358 * does not exist within the group 4359 */ 4360 public View getChildAt(int index) { 4361 if (index < 0 || index >= mChildrenCount) { 4362 return null; 4363 } 4364 return mChildren[index]; 4365 } 4366 4367 /** 4368 * Ask all of the children of this view to measure themselves, taking into 4369 * account both the MeasureSpec requirements for this view and its padding. 4370 * We skip children that are in the GONE state The heavy lifting is done in 4371 * getChildMeasureSpec. 4372 * 4373 * @param widthMeasureSpec The width requirements for this view 4374 * @param heightMeasureSpec The height requirements for this view 4375 */ 4376 protected void measureChildren(int widthMeasureSpec, int heightMeasureSpec) { 4377 final int size = mChildrenCount; 4378 final View[] children = mChildren; 4379 for (int i = 0; i < size; ++i) { 4380 final View child = children[i]; 4381 if ((child.mViewFlags & VISIBILITY_MASK) != GONE) { 4382 measureChild(child, widthMeasureSpec, heightMeasureSpec); 4383 } 4384 } 4385 } 4386 4387 /** 4388 * Ask one of the children of this view to measure itself, taking into 4389 * account both the MeasureSpec requirements for this view and its padding. 4390 * The heavy lifting is done in getChildMeasureSpec. 4391 * 4392 * @param child The child to measure 4393 * @param parentWidthMeasureSpec The width requirements for this view 4394 * @param parentHeightMeasureSpec The height requirements for this view 4395 */ 4396 protected void measureChild(View child, int parentWidthMeasureSpec, 4397 int parentHeightMeasureSpec) { 4398 final LayoutParams lp = child.getLayoutParams(); 4399 4400 final int childWidthMeasureSpec = getChildMeasureSpec(parentWidthMeasureSpec, 4401 mPaddingLeft + mPaddingRight, lp.width); 4402 final int childHeightMeasureSpec = getChildMeasureSpec(parentHeightMeasureSpec, 4403 mPaddingTop + mPaddingBottom, lp.height); 4404 4405 child.measure(childWidthMeasureSpec, childHeightMeasureSpec); 4406 } 4407 4408 /** 4409 * Ask one of the children of this view to measure itself, taking into 4410 * account both the MeasureSpec requirements for this view and its padding 4411 * and margins. The child must have MarginLayoutParams The heavy lifting is 4412 * done in getChildMeasureSpec. 4413 * 4414 * @param child The child to measure 4415 * @param parentWidthMeasureSpec The width requirements for this view 4416 * @param widthUsed Extra space that has been used up by the parent 4417 * horizontally (possibly by other children of the parent) 4418 * @param parentHeightMeasureSpec The height requirements for this view 4419 * @param heightUsed Extra space that has been used up by the parent 4420 * vertically (possibly by other children of the parent) 4421 */ 4422 protected void measureChildWithMargins(View child, 4423 int parentWidthMeasureSpec, int widthUsed, 4424 int parentHeightMeasureSpec, int heightUsed) { 4425 final MarginLayoutParams lp = (MarginLayoutParams) child.getLayoutParams(); 4426 4427 final int childWidthMeasureSpec = getChildMeasureSpec(parentWidthMeasureSpec, 4428 mPaddingLeft + mPaddingRight + lp.leftMargin + lp.rightMargin 4429 + widthUsed, lp.width); 4430 final int childHeightMeasureSpec = getChildMeasureSpec(parentHeightMeasureSpec, 4431 mPaddingTop + mPaddingBottom + lp.topMargin + lp.bottomMargin 4432 + heightUsed, lp.height); 4433 4434 child.measure(childWidthMeasureSpec, childHeightMeasureSpec); 4435 } 4436 4437 /** 4438 * Does the hard part of measureChildren: figuring out the MeasureSpec to 4439 * pass to a particular child. This method figures out the right MeasureSpec 4440 * for one dimension (height or width) of one child view. 4441 * 4442 * The goal is to combine information from our MeasureSpec with the 4443 * LayoutParams of the child to get the best possible results. For example, 4444 * if the this view knows its size (because its MeasureSpec has a mode of 4445 * EXACTLY), and the child has indicated in its LayoutParams that it wants 4446 * to be the same size as the parent, the parent should ask the child to 4447 * layout given an exact size. 4448 * 4449 * @param spec The requirements for this view 4450 * @param padding The padding of this view for the current dimension and 4451 * margins, if applicable 4452 * @param childDimension How big the child wants to be in the current 4453 * dimension 4454 * @return a MeasureSpec integer for the child 4455 */ 4456 public static int getChildMeasureSpec(int spec, int padding, int childDimension) { 4457 int specMode = MeasureSpec.getMode(spec); 4458 int specSize = MeasureSpec.getSize(spec); 4459 4460 int size = Math.max(0, specSize - padding); 4461 4462 int resultSize = 0; 4463 int resultMode = 0; 4464 4465 switch (specMode) { 4466 // Parent has imposed an exact size on us 4467 case MeasureSpec.EXACTLY: 4468 if (childDimension >= 0) { 4469 resultSize = childDimension; 4470 resultMode = MeasureSpec.EXACTLY; 4471 } else if (childDimension == LayoutParams.MATCH_PARENT) { 4472 // Child wants to be our size. So be it. 4473 resultSize = size; 4474 resultMode = MeasureSpec.EXACTLY; 4475 } else if (childDimension == LayoutParams.WRAP_CONTENT) { 4476 // Child wants to determine its own size. It can't be 4477 // bigger than us. 4478 resultSize = size; 4479 resultMode = MeasureSpec.AT_MOST; 4480 } 4481 break; 4482 4483 // Parent has imposed a maximum size on us 4484 case MeasureSpec.AT_MOST: 4485 if (childDimension >= 0) { 4486 // Child wants a specific size... so be it 4487 resultSize = childDimension; 4488 resultMode = MeasureSpec.EXACTLY; 4489 } else if (childDimension == LayoutParams.MATCH_PARENT) { 4490 // Child wants to be our size, but our size is not fixed. 4491 // Constrain child to not be bigger than us. 4492 resultSize = size; 4493 resultMode = MeasureSpec.AT_MOST; 4494 } else if (childDimension == LayoutParams.WRAP_CONTENT) { 4495 // Child wants to determine its own size. It can't be 4496 // bigger than us. 4497 resultSize = size; 4498 resultMode = MeasureSpec.AT_MOST; 4499 } 4500 break; 4501 4502 // Parent asked to see how big we want to be 4503 case MeasureSpec.UNSPECIFIED: 4504 if (childDimension >= 0) { 4505 // Child wants a specific size... let him have it 4506 resultSize = childDimension; 4507 resultMode = MeasureSpec.EXACTLY; 4508 } else if (childDimension == LayoutParams.MATCH_PARENT) { 4509 // Child wants to be our size... find out how big it should 4510 // be 4511 resultSize = 0; 4512 resultMode = MeasureSpec.UNSPECIFIED; 4513 } else if (childDimension == LayoutParams.WRAP_CONTENT) { 4514 // Child wants to determine its own size.... find out how 4515 // big it should be 4516 resultSize = 0; 4517 resultMode = MeasureSpec.UNSPECIFIED; 4518 } 4519 break; 4520 } 4521 return MeasureSpec.makeMeasureSpec(resultSize, resultMode); 4522 } 4523 4524 4525 /** 4526 * Removes any pending animations for views that have been removed. Call 4527 * this if you don't want animations for exiting views to stack up. 4528 */ 4529 public void clearDisappearingChildren() { 4530 if (mDisappearingChildren != null) { 4531 mDisappearingChildren.clear(); 4532 } 4533 } 4534 4535 /** 4536 * Add a view which is removed from mChildren but still needs animation 4537 * 4538 * @param v View to add 4539 */ 4540 private void addDisappearingView(View v) { 4541 ArrayList<View> disappearingChildren = mDisappearingChildren; 4542 4543 if (disappearingChildren == null) { 4544 disappearingChildren = mDisappearingChildren = new ArrayList<View>(); 4545 } 4546 4547 disappearingChildren.add(v); 4548 } 4549 4550 /** 4551 * Cleanup a view when its animation is done. This may mean removing it from 4552 * the list of disappearing views. 4553 * 4554 * @param view The view whose animation has finished 4555 * @param animation The animation, cannot be null 4556 */ 4557 private void finishAnimatingView(final View view, Animation animation) { 4558 final ArrayList<View> disappearingChildren = mDisappearingChildren; 4559 if (disappearingChildren != null) { 4560 if (disappearingChildren.contains(view)) { 4561 disappearingChildren.remove(view); 4562 4563 if (view.mAttachInfo != null) { 4564 view.dispatchDetachedFromWindow(); 4565 } 4566 4567 view.clearAnimation(); 4568 mGroupFlags |= FLAG_INVALIDATE_REQUIRED; 4569 } 4570 } 4571 4572 if (animation != null && !animation.getFillAfter()) { 4573 view.clearAnimation(); 4574 } 4575 4576 if ((view.mPrivateFlags & ANIMATION_STARTED) == ANIMATION_STARTED) { 4577 view.onAnimationEnd(); 4578 // Should be performed by onAnimationEnd() but this avoid an infinite loop, 4579 // so we'd rather be safe than sorry 4580 view.mPrivateFlags &= ~ANIMATION_STARTED; 4581 // Draw one more frame after the animation is done 4582 mGroupFlags |= FLAG_INVALIDATE_REQUIRED; 4583 } 4584 } 4585 4586 /** 4587 * This method tells the ViewGroup that the given View object, which should have this 4588 * ViewGroup as its parent, 4589 * should be kept around (re-displayed when the ViewGroup draws its children) even if it 4590 * is removed from its parent. This allows animations, such as those used by 4591 * {@link android.app.Fragment} and {@link android.animation.LayoutTransition} to animate 4592 * the removal of views. A call to this method should always be accompanied by a later call 4593 * to {@link #endViewTransition(View)}, such as after an animation on the View has finished, 4594 * so that the View finally gets removed. 4595 * 4596 * @param view The View object to be kept visible even if it gets removed from its parent. 4597 */ 4598 public void startViewTransition(View view) { 4599 if (view.mParent == this) { 4600 if (mTransitioningViews == null) { 4601 mTransitioningViews = new ArrayList<View>(); 4602 } 4603 mTransitioningViews.add(view); 4604 } 4605 } 4606 4607 /** 4608 * This method should always be called following an earlier call to 4609 * {@link #startViewTransition(View)}. The given View is finally removed from its parent 4610 * and will no longer be displayed. Note that this method does not perform the functionality 4611 * of removing a view from its parent; it just discontinues the display of a View that 4612 * has previously been removed. 4613 * 4614 * @return view The View object that has been removed but is being kept around in the visible 4615 * hierarchy by an earlier call to {@link #startViewTransition(View)}. 4616 */ 4617 public void endViewTransition(View view) { 4618 if (mTransitioningViews != null) { 4619 mTransitioningViews.remove(view); 4620 final ArrayList<View> disappearingChildren = mDisappearingChildren; 4621 if (disappearingChildren != null && disappearingChildren.contains(view)) { 4622 disappearingChildren.remove(view); 4623 if (mVisibilityChangingChildren != null && 4624 mVisibilityChangingChildren.contains(view)) { 4625 mVisibilityChangingChildren.remove(view); 4626 } else { 4627 if (view.mAttachInfo != null) { 4628 view.dispatchDetachedFromWindow(); 4629 } 4630 if (view.mParent != null) { 4631 view.mParent = null; 4632 } 4633 } 4634 mGroupFlags |= FLAG_INVALIDATE_REQUIRED; 4635 } 4636 } 4637 } 4638 4639 private LayoutTransition.TransitionListener mLayoutTransitionListener = 4640 new LayoutTransition.TransitionListener() { 4641 @Override 4642 public void startTransition(LayoutTransition transition, ViewGroup container, 4643 View view, int transitionType) { 4644 // We only care about disappearing items, since we need special logic to keep 4645 // those items visible after they've been 'removed' 4646 if (transitionType == LayoutTransition.DISAPPEARING) { 4647 startViewTransition(view); 4648 } 4649 } 4650 4651 @Override 4652 public void endTransition(LayoutTransition transition, ViewGroup container, 4653 View view, int transitionType) { 4654 if (mLayoutSuppressed && !transition.isChangingLayout()) { 4655 requestLayout(); 4656 mLayoutSuppressed = false; 4657 } 4658 if (transitionType == LayoutTransition.DISAPPEARING && mTransitioningViews != null) { 4659 endViewTransition(view); 4660 } 4661 } 4662 }; 4663 4664 /** 4665 * {@inheritDoc} 4666 */ 4667 @Override 4668 public boolean gatherTransparentRegion(Region region) { 4669 // If no transparent regions requested, we are always opaque. 4670 final boolean meOpaque = (mPrivateFlags & View.REQUEST_TRANSPARENT_REGIONS) == 0; 4671 if (meOpaque && region == null) { 4672 // The caller doesn't care about the region, so stop now. 4673 return true; 4674 } 4675 super.gatherTransparentRegion(region); 4676 final View[] children = mChildren; 4677 final int count = mChildrenCount; 4678 boolean noneOfTheChildrenAreTransparent = true; 4679 for (int i = 0; i < count; i++) { 4680 final View child = children[i]; 4681 if ((child.mViewFlags & VISIBILITY_MASK) == VISIBLE || child.getAnimation() != null) { 4682 if (!child.gatherTransparentRegion(region)) { 4683 noneOfTheChildrenAreTransparent = false; 4684 } 4685 } 4686 } 4687 return meOpaque || noneOfTheChildrenAreTransparent; 4688 } 4689 4690 /** 4691 * {@inheritDoc} 4692 */ 4693 public void requestTransparentRegion(View child) { 4694 if (child != null) { 4695 child.mPrivateFlags |= View.REQUEST_TRANSPARENT_REGIONS; 4696 if (mParent != null) { 4697 mParent.requestTransparentRegion(this); 4698 } 4699 } 4700 } 4701 4702 4703 @Override 4704 protected boolean fitSystemWindows(Rect insets) { 4705 boolean done = super.fitSystemWindows(insets); 4706 if (!done) { 4707 final int count = mChildrenCount; 4708 final View[] children = mChildren; 4709 for (int i = 0; i < count; i++) { 4710 done = children[i].fitSystemWindows(insets); 4711 if (done) { 4712 break; 4713 } 4714 } 4715 } 4716 return done; 4717 } 4718 4719 /** 4720 * Returns the animation listener to which layout animation events are 4721 * sent. 4722 * 4723 * @return an {@link android.view.animation.Animation.AnimationListener} 4724 */ 4725 public Animation.AnimationListener getLayoutAnimationListener() { 4726 return mAnimationListener; 4727 } 4728 4729 @Override 4730 protected void drawableStateChanged() { 4731 super.drawableStateChanged(); 4732 4733 if ((mGroupFlags & FLAG_NOTIFY_CHILDREN_ON_DRAWABLE_STATE_CHANGE) != 0) { 4734 if ((mGroupFlags & FLAG_ADD_STATES_FROM_CHILDREN) != 0) { 4735 throw new IllegalStateException("addStateFromChildren cannot be enabled if a" 4736 + " child has duplicateParentState set to true"); 4737 } 4738 4739 final View[] children = mChildren; 4740 final int count = mChildrenCount; 4741 4742 for (int i = 0; i < count; i++) { 4743 final View child = children[i]; 4744 if ((child.mViewFlags & DUPLICATE_PARENT_STATE) != 0) { 4745 child.refreshDrawableState(); 4746 } 4747 } 4748 } 4749 } 4750 4751 @Override 4752 public void jumpDrawablesToCurrentState() { 4753 super.jumpDrawablesToCurrentState(); 4754 final View[] children = mChildren; 4755 final int count = mChildrenCount; 4756 for (int i = 0; i < count; i++) { 4757 children[i].jumpDrawablesToCurrentState(); 4758 } 4759 } 4760 4761 @Override 4762 protected int[] onCreateDrawableState(int extraSpace) { 4763 if ((mGroupFlags & FLAG_ADD_STATES_FROM_CHILDREN) == 0) { 4764 return super.onCreateDrawableState(extraSpace); 4765 } 4766 4767 int need = 0; 4768 int n = getChildCount(); 4769 for (int i = 0; i < n; i++) { 4770 int[] childState = getChildAt(i).getDrawableState(); 4771 4772 if (childState != null) { 4773 need += childState.length; 4774 } 4775 } 4776 4777 int[] state = super.onCreateDrawableState(extraSpace + need); 4778 4779 for (int i = 0; i < n; i++) { 4780 int[] childState = getChildAt(i).getDrawableState(); 4781 4782 if (childState != null) { 4783 state = mergeDrawableStates(state, childState); 4784 } 4785 } 4786 4787 return state; 4788 } 4789 4790 /** 4791 * Sets 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 void setAddStatesFromChildren(boolean addsStates) { 4797 if (addsStates) { 4798 mGroupFlags |= FLAG_ADD_STATES_FROM_CHILDREN; 4799 } else { 4800 mGroupFlags &= ~FLAG_ADD_STATES_FROM_CHILDREN; 4801 } 4802 4803 refreshDrawableState(); 4804 } 4805 4806 /** 4807 * Returns whether this ViewGroup's drawable states also include 4808 * its children's drawable states. This is used, for example, to 4809 * make a group appear to be focused when its child EditText or button 4810 * is focused. 4811 */ 4812 public boolean addStatesFromChildren() { 4813 return (mGroupFlags & FLAG_ADD_STATES_FROM_CHILDREN) != 0; 4814 } 4815 4816 /** 4817 * If {link #addStatesFromChildren} is true, refreshes this group's 4818 * drawable state (to include the states from its children). 4819 */ 4820 public void childDrawableStateChanged(View child) { 4821 if ((mGroupFlags & FLAG_ADD_STATES_FROM_CHILDREN) != 0) { 4822 refreshDrawableState(); 4823 } 4824 } 4825 4826 /** 4827 * Specifies the animation listener to which layout animation events must 4828 * be sent. Only 4829 * {@link android.view.animation.Animation.AnimationListener#onAnimationStart(Animation)} 4830 * and 4831 * {@link android.view.animation.Animation.AnimationListener#onAnimationEnd(Animation)} 4832 * are invoked. 4833 * 4834 * @param animationListener the layout animation listener 4835 */ 4836 public void setLayoutAnimationListener(Animation.AnimationListener animationListener) { 4837 mAnimationListener = animationListener; 4838 } 4839 4840 /** 4841 * Return true if the pressed state should be delayed for children or descendants of this 4842 * ViewGroup. Generally, this should be done for containers that can scroll, such as a List. 4843 * This prevents the pressed state from appearing when the user is actually trying to scroll 4844 * the content. 4845 * 4846 * The default implementation returns true for compatibility reasons. Subclasses that do 4847 * not scroll should generally override this method and return false. 4848 */ 4849 public boolean shouldDelayChildPressedState() { 4850 return true; 4851 } 4852 4853 /** 4854 * LayoutParams are used by views to tell their parents how they want to be 4855 * laid out. See 4856 * {@link android.R.styleable#ViewGroup_Layout ViewGroup Layout Attributes} 4857 * for a list of all child view attributes that this class supports. 4858 * 4859 * <p> 4860 * The base LayoutParams class just describes how big the view wants to be 4861 * for both width and height. For each dimension, it can specify one of: 4862 * <ul> 4863 * <li>FILL_PARENT (renamed MATCH_PARENT in API Level 8 and higher), which 4864 * means that the view wants to be as big as its parent (minus padding) 4865 * <li> WRAP_CONTENT, which means that the view wants to be just big enough 4866 * to enclose its content (plus padding) 4867 * <li> an exact number 4868 * </ul> 4869 * There are subclasses of LayoutParams for different subclasses of 4870 * ViewGroup. For example, AbsoluteLayout has its own subclass of 4871 * LayoutParams which adds an X and Y value. 4872 * 4873 * @attr ref android.R.styleable#ViewGroup_Layout_layout_height 4874 * @attr ref android.R.styleable#ViewGroup_Layout_layout_width 4875 */ 4876 public static class LayoutParams { 4877 /** 4878 * Special value for the height or width requested by a View. 4879 * FILL_PARENT means that the view wants to be as big as its parent, 4880 * minus the parent's padding, if any. This value is deprecated 4881 * starting in API Level 8 and replaced by {@link #MATCH_PARENT}. 4882 */ 4883 @SuppressWarnings({"UnusedDeclaration"}) 4884 @Deprecated 4885 public static final int FILL_PARENT = -1; 4886 4887 /** 4888 * Special value for the height or width requested by a View. 4889 * MATCH_PARENT means that the view wants to be as big as its parent, 4890 * minus the parent's padding, if any. Introduced in API Level 8. 4891 */ 4892 public static final int MATCH_PARENT = -1; 4893 4894 /** 4895 * Special value for the height or width requested by a View. 4896 * WRAP_CONTENT means that the view wants to be just large enough to fit 4897 * its own internal content, taking its own padding into account. 4898 */ 4899 public static final int WRAP_CONTENT = -2; 4900 4901 /** 4902 * Information about how wide the view wants to be. Can be one of the 4903 * constants FILL_PARENT (replaced by MATCH_PARENT , 4904 * in API Level 8) or WRAP_CONTENT. or an exact size. 4905 */ 4906 @ViewDebug.ExportedProperty(category = "layout", mapping = { 4907 @ViewDebug.IntToString(from = MATCH_PARENT, to = "MATCH_PARENT"), 4908 @ViewDebug.IntToString(from = WRAP_CONTENT, to = "WRAP_CONTENT") 4909 }) 4910 public int width; 4911 4912 /** 4913 * Information about how tall the view wants to be. Can be one of the 4914 * constants FILL_PARENT (replaced by MATCH_PARENT , 4915 * in API Level 8) or WRAP_CONTENT. or an exact size. 4916 */ 4917 @ViewDebug.ExportedProperty(category = "layout", mapping = { 4918 @ViewDebug.IntToString(from = MATCH_PARENT, to = "MATCH_PARENT"), 4919 @ViewDebug.IntToString(from = WRAP_CONTENT, to = "WRAP_CONTENT") 4920 }) 4921 public int height; 4922 4923 /** 4924 * Used to animate layouts. 4925 */ 4926 public LayoutAnimationController.AnimationParameters layoutAnimationParameters; 4927 4928 /** 4929 * Creates a new set of layout parameters. The values are extracted from 4930 * the supplied attributes set and context. The XML attributes mapped 4931 * to this set of layout parameters are: 4932 * 4933 * <ul> 4934 * <li><code>layout_width</code>: the width, either an exact value, 4935 * {@link #WRAP_CONTENT}, or {@link #FILL_PARENT} (replaced by 4936 * {@link #MATCH_PARENT} in API Level 8)</li> 4937 * <li><code>layout_height</code>: the height, either an exact value, 4938 * {@link #WRAP_CONTENT}, or {@link #FILL_PARENT} (replaced by 4939 * {@link #MATCH_PARENT} in API Level 8)</li> 4940 * </ul> 4941 * 4942 * @param c the application environment 4943 * @param attrs the set of attributes from which to extract the layout 4944 * parameters' values 4945 */ 4946 public LayoutParams(Context c, AttributeSet attrs) { 4947 TypedArray a = c.obtainStyledAttributes(attrs, R.styleable.ViewGroup_Layout); 4948 setBaseAttributes(a, 4949 R.styleable.ViewGroup_Layout_layout_width, 4950 R.styleable.ViewGroup_Layout_layout_height); 4951 a.recycle(); 4952 } 4953 4954 /** 4955 * Creates a new set of layout parameters with the specified width 4956 * and height. 4957 * 4958 * @param width the width, either {@link #WRAP_CONTENT}, 4959 * {@link #FILL_PARENT} (replaced by {@link #MATCH_PARENT} in 4960 * API Level 8), or a fixed size in pixels 4961 * @param height the height, either {@link #WRAP_CONTENT}, 4962 * {@link #FILL_PARENT} (replaced by {@link #MATCH_PARENT} in 4963 * API Level 8), or a fixed size in pixels 4964 */ 4965 public LayoutParams(int width, int height) { 4966 this.width = width; 4967 this.height = height; 4968 } 4969 4970 /** 4971 * Copy constructor. Clones the width and height values of the source. 4972 * 4973 * @param source The layout params to copy from. 4974 */ 4975 public LayoutParams(LayoutParams source) { 4976 this.width = source.width; 4977 this.height = source.height; 4978 } 4979 4980 /** 4981 * Used internally by MarginLayoutParams. 4982 * @hide 4983 */ 4984 LayoutParams() { 4985 } 4986 4987 /** 4988 * Extracts the layout parameters from the supplied attributes. 4989 * 4990 * @param a the style attributes to extract the parameters from 4991 * @param widthAttr the identifier of the width attribute 4992 * @param heightAttr the identifier of the height attribute 4993 */ 4994 protected void setBaseAttributes(TypedArray a, int widthAttr, int heightAttr) { 4995 width = a.getLayoutDimension(widthAttr, "layout_width"); 4996 height = a.getLayoutDimension(heightAttr, "layout_height"); 4997 } 4998 4999 /** 5000 * Returns a String representation of this set of layout parameters. 5001 * 5002 * @param output the String to prepend to the internal representation 5003 * @return a String with the following format: output + 5004 * "ViewGroup.LayoutParams={ width=WIDTH, height=HEIGHT }" 5005 * 5006 * @hide 5007 */ 5008 public String debug(String output) { 5009 return output + "ViewGroup.LayoutParams={ width=" 5010 + sizeToString(width) + ", height=" + sizeToString(height) + " }"; 5011 } 5012 5013 /** 5014 * Converts the specified size to a readable String. 5015 * 5016 * @param size the size to convert 5017 * @return a String instance representing the supplied size 5018 * 5019 * @hide 5020 */ 5021 protected static String sizeToString(int size) { 5022 if (size == WRAP_CONTENT) { 5023 return "wrap-content"; 5024 } 5025 if (size == MATCH_PARENT) { 5026 return "match-parent"; 5027 } 5028 return String.valueOf(size); 5029 } 5030 } 5031 5032 /** 5033 * Per-child layout information for layouts that support margins. 5034 * See 5035 * {@link android.R.styleable#ViewGroup_MarginLayout ViewGroup Margin Layout Attributes} 5036 * for a list of all child view attributes that this class supports. 5037 */ 5038 public static class MarginLayoutParams extends ViewGroup.LayoutParams { 5039 /** 5040 * The left margin in pixels of the child. 5041 */ 5042 @ViewDebug.ExportedProperty(category = "layout") 5043 public int leftMargin; 5044 5045 /** 5046 * The top margin in pixels of the child. 5047 */ 5048 @ViewDebug.ExportedProperty(category = "layout") 5049 public int topMargin; 5050 5051 /** 5052 * The right margin in pixels of the child. 5053 */ 5054 @ViewDebug.ExportedProperty(category = "layout") 5055 public int rightMargin; 5056 5057 /** 5058 * The bottom margin in pixels of the child. 5059 */ 5060 @ViewDebug.ExportedProperty(category = "layout") 5061 public int bottomMargin; 5062 5063 /** 5064 * Creates a new set of layout parameters. The values are extracted from 5065 * the supplied attributes set and context. 5066 * 5067 * @param c the application environment 5068 * @param attrs the set of attributes from which to extract the layout 5069 * parameters' values 5070 */ 5071 public MarginLayoutParams(Context c, AttributeSet attrs) { 5072 super(); 5073 5074 TypedArray a = c.obtainStyledAttributes(attrs, R.styleable.ViewGroup_MarginLayout); 5075 setBaseAttributes(a, 5076 R.styleable.ViewGroup_MarginLayout_layout_width, 5077 R.styleable.ViewGroup_MarginLayout_layout_height); 5078 5079 int margin = a.getDimensionPixelSize( 5080 com.android.internal.R.styleable.ViewGroup_MarginLayout_layout_margin, -1); 5081 if (margin >= 0) { 5082 leftMargin = margin; 5083 topMargin = margin; 5084 rightMargin= margin; 5085 bottomMargin = margin; 5086 } else { 5087 leftMargin = a.getDimensionPixelSize( 5088 R.styleable.ViewGroup_MarginLayout_layout_marginLeft, 0); 5089 topMargin = a.getDimensionPixelSize( 5090 R.styleable.ViewGroup_MarginLayout_layout_marginTop, 0); 5091 rightMargin = a.getDimensionPixelSize( 5092 R.styleable.ViewGroup_MarginLayout_layout_marginRight, 0); 5093 bottomMargin = a.getDimensionPixelSize( 5094 R.styleable.ViewGroup_MarginLayout_layout_marginBottom, 0); 5095 } 5096 5097 a.recycle(); 5098 } 5099 5100 /** 5101 * {@inheritDoc} 5102 */ 5103 public MarginLayoutParams(int width, int height) { 5104 super(width, height); 5105 } 5106 5107 /** 5108 * Copy constructor. Clones the width, height and margin values of the source. 5109 * 5110 * @param source The layout params to copy from. 5111 */ 5112 public MarginLayoutParams(MarginLayoutParams source) { 5113 this.width = source.width; 5114 this.height = source.height; 5115 5116 this.leftMargin = source.leftMargin; 5117 this.topMargin = source.topMargin; 5118 this.rightMargin = source.rightMargin; 5119 this.bottomMargin = source.bottomMargin; 5120 } 5121 5122 /** 5123 * {@inheritDoc} 5124 */ 5125 public MarginLayoutParams(LayoutParams source) { 5126 super(source); 5127 } 5128 5129 /** 5130 * Sets the margins, in pixels. 5131 * 5132 * @param left the left margin size 5133 * @param top the top margin size 5134 * @param right the right margin size 5135 * @param bottom the bottom margin size 5136 * 5137 * @attr ref android.R.styleable#ViewGroup_MarginLayout_layout_marginLeft 5138 * @attr ref android.R.styleable#ViewGroup_MarginLayout_layout_marginTop 5139 * @attr ref android.R.styleable#ViewGroup_MarginLayout_layout_marginRight 5140 * @attr ref android.R.styleable#ViewGroup_MarginLayout_layout_marginBottom 5141 */ 5142 public void setMargins(int left, int top, int right, int bottom) { 5143 leftMargin = left; 5144 topMargin = top; 5145 rightMargin = right; 5146 bottomMargin = bottom; 5147 } 5148 } 5149 5150 /* Describes a touched view and the ids of the pointers that it has captured. 5151 * 5152 * This code assumes that pointer ids are always in the range 0..31 such that 5153 * it can use a bitfield to track which pointer ids are present. 5154 * As it happens, the lower layers of the input dispatch pipeline also use the 5155 * same trick so the assumption should be safe here... 5156 */ 5157 private static final class TouchTarget { 5158 private static final int MAX_RECYCLED = 32; 5159 private static final Object sRecycleLock = new Object(); 5160 private static TouchTarget sRecycleBin; 5161 private static int sRecycledCount; 5162 5163 public static final int ALL_POINTER_IDS = -1; // all ones 5164 5165 // The touched child view. 5166 public View child; 5167 5168 // The combined bit mask of pointer ids for all pointers captured by the target. 5169 public int pointerIdBits; 5170 5171 // The next target in the target list. 5172 public TouchTarget next; 5173 5174 private TouchTarget() { 5175 } 5176 5177 public static TouchTarget obtain(View child, int pointerIdBits) { 5178 final TouchTarget target; 5179 synchronized (sRecycleLock) { 5180 if (sRecycleBin == null) { 5181 target = new TouchTarget(); 5182 } else { 5183 target = sRecycleBin; 5184 sRecycleBin = target.next; 5185 sRecycledCount--; 5186 target.next = null; 5187 } 5188 } 5189 target.child = child; 5190 target.pointerIdBits = pointerIdBits; 5191 return target; 5192 } 5193 5194 public void recycle() { 5195 synchronized (sRecycleLock) { 5196 if (sRecycledCount < MAX_RECYCLED) { 5197 next = sRecycleBin; 5198 sRecycleBin = this; 5199 sRecycledCount += 1; 5200 } else { 5201 next = null; 5202 } 5203 child = null; 5204 } 5205 } 5206 } 5207} 5208