ViewGroup.java revision 5ada6cb0591c1106e3591a3b7adcdc77a1322209
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 com.android.internal.R; 21 22import android.content.Context; 23import android.content.res.Configuration; 24import android.content.res.TypedArray; 25import android.graphics.Bitmap; 26import android.graphics.Canvas; 27import android.graphics.Matrix; 28import android.graphics.Paint; 29import android.graphics.PointF; 30import android.graphics.Rect; 31import android.graphics.RectF; 32import android.graphics.Region; 33import android.os.Parcelable; 34import android.os.SystemClock; 35import android.util.AttributeSet; 36import android.util.Log; 37import android.util.SparseArray; 38import android.view.accessibility.AccessibilityEvent; 39import android.view.animation.Animation; 40import android.view.animation.AnimationUtils; 41import android.view.animation.LayoutAnimationController; 42import android.view.animation.Transformation; 43 44import java.util.ArrayList; 45 46/** 47 * <p> 48 * A <code>ViewGroup</code> is a special view that can contain other views 49 * (called children.) The view group is the base class for layouts and views 50 * containers. This class also defines the 51 * {@link android.view.ViewGroup.LayoutParams} class which serves as the base 52 * class for layouts parameters. 53 * </p> 54 * 55 * <p> 56 * Also see {@link LayoutParams} for layout attributes. 57 * </p> 58 * 59 * @attr ref android.R.styleable#ViewGroup_clipChildren 60 * @attr ref android.R.styleable#ViewGroup_clipToPadding 61 * @attr ref android.R.styleable#ViewGroup_layoutAnimation 62 * @attr ref android.R.styleable#ViewGroup_animationCache 63 * @attr ref android.R.styleable#ViewGroup_persistentDrawingCache 64 * @attr ref android.R.styleable#ViewGroup_alwaysDrawnWithCache 65 * @attr ref android.R.styleable#ViewGroup_addStatesFromChildren 66 * @attr ref android.R.styleable#ViewGroup_descendantFocusability 67 * @attr ref android.R.styleable#ViewGroup_animateLayoutChanges 68 */ 69public abstract class ViewGroup extends View implements ViewParent, ViewManager { 70 71 private static final boolean DBG = false; 72 73 /** 74 * Views which have been hidden or removed which need to be animated on 75 * their way out. 76 * This field should be made private, so it is hidden from the SDK. 77 * {@hide} 78 */ 79 protected ArrayList<View> mDisappearingChildren; 80 81 /** 82 * Listener used to propagate events indicating when children are added 83 * and/or removed from a view group. 84 * This field should be made private, so it is hidden from the SDK. 85 * {@hide} 86 */ 87 protected OnHierarchyChangeListener mOnHierarchyChangeListener; 88 89 // The view contained within this ViewGroup that has or contains focus. 90 private View mFocused; 91 92 /** 93 * A Transformation used when drawing children, to 94 * apply on the child being drawn. 95 */ 96 private final Transformation mChildTransformation = new Transformation(); 97 98 /** 99 * Used to track the current invalidation region. 100 */ 101 private RectF mInvalidateRegion; 102 103 /** 104 * A Transformation used to calculate a correct 105 * invalidation area when the application is autoscaled. 106 */ 107 private Transformation mInvalidationTransformation; 108 109 // View currently under an ongoing drag 110 private View mCurrentDragView; 111 112 // Does this group have a child that can accept the current drag payload? 113 private boolean mChildAcceptsDrag; 114 115 // Used during drag dispatch 116 private final PointF mLocalPoint = new PointF(); 117 118 // Layout animation 119 private LayoutAnimationController mLayoutAnimationController; 120 private Animation.AnimationListener mAnimationListener; 121 122 // First touch target in the linked list of touch targets. 123 private TouchTarget mFirstTouchTarget; 124 125 // Temporary arrays for splitting pointers. 126 private int[] mTmpPointerIndexMap; 127 private int[] mTmpPointerIds; 128 private MotionEvent.PointerCoords[] mTmpPointerCoords; 129 130 /** 131 * Internal flags. 132 * 133 * This field should be made private, so it is hidden from the SDK. 134 * {@hide} 135 */ 136 protected int mGroupFlags; 137 138 // When set, ViewGroup invalidates only the child's rectangle 139 // Set by default 140 private static final int FLAG_CLIP_CHILDREN = 0x1; 141 142 // When set, ViewGroup excludes the padding area from the invalidate rectangle 143 // Set by default 144 private static final int FLAG_CLIP_TO_PADDING = 0x2; 145 146 // When set, dispatchDraw() will invoke invalidate(); this is set by drawChild() when 147 // a child needs to be invalidated and FLAG_OPTIMIZE_INVALIDATE is set 148 private static final int FLAG_INVALIDATE_REQUIRED = 0x4; 149 150 // When set, dispatchDraw() will run the layout animation and unset the flag 151 private static final int FLAG_RUN_ANIMATION = 0x8; 152 153 // When set, there is either no layout animation on the ViewGroup or the layout 154 // animation is over 155 // Set by default 156 private static final int FLAG_ANIMATION_DONE = 0x10; 157 158 // If set, this ViewGroup has padding; if unset there is no padding and we don't need 159 // to clip it, even if FLAG_CLIP_TO_PADDING is set 160 private static final int FLAG_PADDING_NOT_NULL = 0x20; 161 162 // When set, this ViewGroup caches its children in a Bitmap before starting a layout animation 163 // Set by default 164 private static final int FLAG_ANIMATION_CACHE = 0x40; 165 166 // When set, this ViewGroup converts calls to invalidate(Rect) to invalidate() during a 167 // layout animation; this avoid clobbering the hierarchy 168 // Automatically set when the layout animation starts, depending on the animation's 169 // characteristics 170 private static final int FLAG_OPTIMIZE_INVALIDATE = 0x80; 171 172 // When set, the next call to drawChild() will clear mChildTransformation's matrix 173 private static final int FLAG_CLEAR_TRANSFORMATION = 0x100; 174 175 // When set, this ViewGroup invokes mAnimationListener.onAnimationEnd() and removes 176 // the children's Bitmap caches if necessary 177 // This flag is set when the layout animation is over (after FLAG_ANIMATION_DONE is set) 178 private static final int FLAG_NOTIFY_ANIMATION_LISTENER = 0x200; 179 180 /** 181 * When set, the drawing method will call {@link #getChildDrawingOrder(int, int)} 182 * to get the index of the child to draw for that iteration. 183 * 184 * @hide 185 */ 186 protected static final int FLAG_USE_CHILD_DRAWING_ORDER = 0x400; 187 188 /** 189 * When set, this ViewGroup supports static transformations on children; this causes 190 * {@link #getChildStaticTransformation(View, android.view.animation.Transformation)} to be 191 * invoked when a child is drawn. 192 * 193 * Any subclass overriding 194 * {@link #getChildStaticTransformation(View, android.view.animation.Transformation)} should 195 * set this flags in {@link #mGroupFlags}. 196 * 197 * {@hide} 198 */ 199 protected static final int FLAG_SUPPORT_STATIC_TRANSFORMATIONS = 0x800; 200 201 // When the previous drawChild() invocation used an alpha value that was lower than 202 // 1.0 and set it in mCachePaint 203 private static final int FLAG_ALPHA_LOWER_THAN_ONE = 0x1000; 204 205 /** 206 * When set, this ViewGroup's drawable states also include those 207 * of its children. 208 */ 209 private static final int FLAG_ADD_STATES_FROM_CHILDREN = 0x2000; 210 211 /** 212 * When set, this ViewGroup tries to always draw its children using their drawing cache. 213 */ 214 private static final int FLAG_ALWAYS_DRAWN_WITH_CACHE = 0x4000; 215 216 /** 217 * When set, and if FLAG_ALWAYS_DRAWN_WITH_CACHE is not set, this ViewGroup will try to 218 * draw its children with their drawing cache. 219 */ 220 private static final int FLAG_CHILDREN_DRAWN_WITH_CACHE = 0x8000; 221 222 /** 223 * When set, this group will go through its list of children to notify them of 224 * any drawable state change. 225 */ 226 private static final int FLAG_NOTIFY_CHILDREN_ON_DRAWABLE_STATE_CHANGE = 0x10000; 227 228 private static final int FLAG_MASK_FOCUSABILITY = 0x60000; 229 230 /** 231 * This view will get focus before any of its descendants. 232 */ 233 public static final int FOCUS_BEFORE_DESCENDANTS = 0x20000; 234 235 /** 236 * This view will get focus only if none of its descendants want it. 237 */ 238 public static final int FOCUS_AFTER_DESCENDANTS = 0x40000; 239 240 /** 241 * This view will block any of its descendants from getting focus, even 242 * if they are focusable. 243 */ 244 public static final int FOCUS_BLOCK_DESCENDANTS = 0x60000; 245 246 /** 247 * Used to map between enum in attrubutes and flag values. 248 */ 249 private static final int[] DESCENDANT_FOCUSABILITY_FLAGS = 250 {FOCUS_BEFORE_DESCENDANTS, FOCUS_AFTER_DESCENDANTS, 251 FOCUS_BLOCK_DESCENDANTS}; 252 253 /** 254 * When set, this ViewGroup should not intercept touch events. 255 * {@hide} 256 */ 257 protected static final int FLAG_DISALLOW_INTERCEPT = 0x80000; 258 259 /** 260 * When set, this ViewGroup will split MotionEvents to multiple child Views when appropriate. 261 */ 262 private static final int FLAG_SPLIT_MOTION_EVENTS = 0x200000; 263 264 /** 265 * Indicates which types of drawing caches are to be kept in memory. 266 * This field should be made private, so it is hidden from the SDK. 267 * {@hide} 268 */ 269 protected int mPersistentDrawingCache; 270 271 /** 272 * Used to indicate that no drawing cache should be kept in memory. 273 */ 274 public static final int PERSISTENT_NO_CACHE = 0x0; 275 276 /** 277 * Used to indicate that the animation drawing cache should be kept in memory. 278 */ 279 public static final int PERSISTENT_ANIMATION_CACHE = 0x1; 280 281 /** 282 * Used to indicate that the scrolling drawing cache should be kept in memory. 283 */ 284 public static final int PERSISTENT_SCROLLING_CACHE = 0x2; 285 286 /** 287 * Used to indicate that all drawing caches should be kept in memory. 288 */ 289 public static final int PERSISTENT_ALL_CACHES = 0x3; 290 291 /** 292 * We clip to padding when FLAG_CLIP_TO_PADDING and FLAG_PADDING_NOT_NULL 293 * are set at the same time. 294 */ 295 protected static final int CLIP_TO_PADDING_MASK = FLAG_CLIP_TO_PADDING | FLAG_PADDING_NOT_NULL; 296 297 // Index of the child's left position in the mLocation array 298 private static final int CHILD_LEFT_INDEX = 0; 299 // Index of the child's top position in the mLocation array 300 private static final int CHILD_TOP_INDEX = 1; 301 302 // Child views of this ViewGroup 303 private View[] mChildren; 304 // Number of valid children in the mChildren array, the rest should be null or not 305 // considered as children 306 private int mChildrenCount; 307 308 private static final int ARRAY_INITIAL_CAPACITY = 12; 309 private static final int ARRAY_CAPACITY_INCREMENT = 12; 310 311 // Used to draw cached views 312 private final Paint mCachePaint = new Paint(); 313 314 // Used to animate add/remove changes in layout 315 private LayoutTransition mTransition; 316 317 // The set of views that are currently being transitioned. This list is used to track views 318 // being removed that should not actually be removed from the parent yet because they are 319 // being animated. 320 private ArrayList<View> mTransitioningViews; 321 322 // List of children changing visibility. This is used to potentially keep rendering 323 // views during a transition when they otherwise would have become gone/invisible 324 private ArrayList<View> mVisibilityChangingChildren; 325 326 public ViewGroup(Context context) { 327 super(context); 328 initViewGroup(); 329 } 330 331 public ViewGroup(Context context, AttributeSet attrs) { 332 super(context, attrs); 333 initViewGroup(); 334 initFromAttributes(context, attrs); 335 } 336 337 public ViewGroup(Context context, AttributeSet attrs, int defStyle) { 338 super(context, attrs, defStyle); 339 initViewGroup(); 340 initFromAttributes(context, attrs); 341 } 342 343 private void initViewGroup() { 344 // ViewGroup doesn't draw by default 345 setFlags(WILL_NOT_DRAW, DRAW_MASK); 346 mGroupFlags |= FLAG_CLIP_CHILDREN; 347 mGroupFlags |= FLAG_CLIP_TO_PADDING; 348 mGroupFlags |= FLAG_ANIMATION_DONE; 349 mGroupFlags |= FLAG_ANIMATION_CACHE; 350 mGroupFlags |= FLAG_ALWAYS_DRAWN_WITH_CACHE; 351 352 setDescendantFocusability(FOCUS_BEFORE_DESCENDANTS); 353 354 mChildren = new View[ARRAY_INITIAL_CAPACITY]; 355 mChildrenCount = 0; 356 357 mCachePaint.setDither(false); 358 359 mPersistentDrawingCache = PERSISTENT_SCROLLING_CACHE; 360 } 361 362 private void initFromAttributes(Context context, AttributeSet attrs) { 363 TypedArray a = context.obtainStyledAttributes(attrs, 364 R.styleable.ViewGroup); 365 366 final int N = a.getIndexCount(); 367 for (int i = 0; i < N; i++) { 368 int attr = a.getIndex(i); 369 switch (attr) { 370 case R.styleable.ViewGroup_clipChildren: 371 setClipChildren(a.getBoolean(attr, true)); 372 break; 373 case R.styleable.ViewGroup_clipToPadding: 374 setClipToPadding(a.getBoolean(attr, true)); 375 break; 376 case R.styleable.ViewGroup_animationCache: 377 setAnimationCacheEnabled(a.getBoolean(attr, true)); 378 break; 379 case R.styleable.ViewGroup_persistentDrawingCache: 380 setPersistentDrawingCache(a.getInt(attr, PERSISTENT_SCROLLING_CACHE)); 381 break; 382 case R.styleable.ViewGroup_addStatesFromChildren: 383 setAddStatesFromChildren(a.getBoolean(attr, false)); 384 break; 385 case R.styleable.ViewGroup_alwaysDrawnWithCache: 386 setAlwaysDrawnWithCacheEnabled(a.getBoolean(attr, true)); 387 break; 388 case R.styleable.ViewGroup_layoutAnimation: 389 int id = a.getResourceId(attr, -1); 390 if (id > 0) { 391 setLayoutAnimation(AnimationUtils.loadLayoutAnimation(mContext, id)); 392 } 393 break; 394 case R.styleable.ViewGroup_descendantFocusability: 395 setDescendantFocusability(DESCENDANT_FOCUSABILITY_FLAGS[a.getInt(attr, 0)]); 396 break; 397 case R.styleable.ViewGroup_splitMotionEvents: 398 setMotionEventSplittingEnabled(a.getBoolean(attr, false)); 399 break; 400 case R.styleable.ViewGroup_animateLayoutChanges: 401 boolean animateLayoutChanges = a.getBoolean(attr, false); 402 if (animateLayoutChanges) { 403 setLayoutTransition(new LayoutTransition()); 404 } 405 break; 406 } 407 } 408 409 a.recycle(); 410 } 411 412 /** 413 * Gets the descendant focusability of this view group. The descendant 414 * focusability defines the relationship between this view group and its 415 * descendants when looking for a view to take focus in 416 * {@link #requestFocus(int, android.graphics.Rect)}. 417 * 418 * @return one of {@link #FOCUS_BEFORE_DESCENDANTS}, {@link #FOCUS_AFTER_DESCENDANTS}, 419 * {@link #FOCUS_BLOCK_DESCENDANTS}. 420 */ 421 @ViewDebug.ExportedProperty(category = "focus", mapping = { 422 @ViewDebug.IntToString(from = FOCUS_BEFORE_DESCENDANTS, to = "FOCUS_BEFORE_DESCENDANTS"), 423 @ViewDebug.IntToString(from = FOCUS_AFTER_DESCENDANTS, to = "FOCUS_AFTER_DESCENDANTS"), 424 @ViewDebug.IntToString(from = FOCUS_BLOCK_DESCENDANTS, to = "FOCUS_BLOCK_DESCENDANTS") 425 }) 426 public int getDescendantFocusability() { 427 return mGroupFlags & FLAG_MASK_FOCUSABILITY; 428 } 429 430 /** 431 * Set the descendant focusability of this view group. This defines the relationship 432 * between this view group and its descendants when looking for a view to 433 * take focus in {@link #requestFocus(int, android.graphics.Rect)}. 434 * 435 * @param focusability one of {@link #FOCUS_BEFORE_DESCENDANTS}, {@link #FOCUS_AFTER_DESCENDANTS}, 436 * {@link #FOCUS_BLOCK_DESCENDANTS}. 437 */ 438 public void setDescendantFocusability(int focusability) { 439 switch (focusability) { 440 case FOCUS_BEFORE_DESCENDANTS: 441 case FOCUS_AFTER_DESCENDANTS: 442 case FOCUS_BLOCK_DESCENDANTS: 443 break; 444 default: 445 throw new IllegalArgumentException("must be one of FOCUS_BEFORE_DESCENDANTS, " 446 + "FOCUS_AFTER_DESCENDANTS, FOCUS_BLOCK_DESCENDANTS"); 447 } 448 mGroupFlags &= ~FLAG_MASK_FOCUSABILITY; 449 mGroupFlags |= (focusability & FLAG_MASK_FOCUSABILITY); 450 } 451 452 /** 453 * {@inheritDoc} 454 */ 455 @Override 456 void handleFocusGainInternal(int direction, Rect previouslyFocusedRect) { 457 if (mFocused != null) { 458 mFocused.unFocus(); 459 mFocused = null; 460 } 461 super.handleFocusGainInternal(direction, previouslyFocusedRect); 462 } 463 464 /** 465 * {@inheritDoc} 466 */ 467 public void requestChildFocus(View child, View focused) { 468 if (DBG) { 469 System.out.println(this + " requestChildFocus()"); 470 } 471 if (getDescendantFocusability() == FOCUS_BLOCK_DESCENDANTS) { 472 return; 473 } 474 475 // Unfocus us, if necessary 476 super.unFocus(); 477 478 // We had a previous notion of who had focus. Clear it. 479 if (mFocused != child) { 480 if (mFocused != null) { 481 mFocused.unFocus(); 482 } 483 484 mFocused = child; 485 } 486 if (mParent != null) { 487 mParent.requestChildFocus(this, focused); 488 } 489 } 490 491 /** 492 * {@inheritDoc} 493 */ 494 public void focusableViewAvailable(View v) { 495 if (mParent != null 496 // shortcut: don't report a new focusable view if we block our descendants from 497 // getting focus 498 && (getDescendantFocusability() != FOCUS_BLOCK_DESCENDANTS) 499 // shortcut: don't report a new focusable view if we already are focused 500 // (and we don't prefer our descendants) 501 // 502 // note: knowing that mFocused is non-null is not a good enough reason 503 // to break the traversal since in that case we'd actually have to find 504 // the focused view and make sure it wasn't FOCUS_AFTER_DESCENDANTS and 505 // an ancestor of v; this will get checked for at ViewRoot 506 && !(isFocused() && getDescendantFocusability() != FOCUS_AFTER_DESCENDANTS)) { 507 mParent.focusableViewAvailable(v); 508 } 509 } 510 511 /** 512 * {@inheritDoc} 513 */ 514 public boolean showContextMenuForChild(View originalView) { 515 return mParent != null && mParent.showContextMenuForChild(originalView); 516 } 517 518 /** 519 * {@inheritDoc} 520 */ 521 public ActionMode startActionModeForChild(View originalView, ActionMode.Callback callback) { 522 return mParent != null ? mParent.startActionModeForChild(originalView, callback) : null; 523 } 524 525 /** 526 * Find the nearest view in the specified direction that wants to take 527 * focus. 528 * 529 * @param focused The view that currently has focus 530 * @param direction One of FOCUS_UP, FOCUS_DOWN, FOCUS_LEFT, and 531 * FOCUS_RIGHT, or 0 for not applicable. 532 */ 533 public View focusSearch(View focused, int direction) { 534 if (isRootNamespace()) { 535 // root namespace means we should consider ourselves the top of the 536 // tree for focus searching; otherwise we could be focus searching 537 // into other tabs. see LocalActivityManager and TabHost for more info 538 return FocusFinder.getInstance().findNextFocus(this, focused, direction); 539 } else if (mParent != null) { 540 return mParent.focusSearch(focused, direction); 541 } 542 return null; 543 } 544 545 /** 546 * {@inheritDoc} 547 */ 548 public boolean requestChildRectangleOnScreen(View child, Rect rectangle, boolean immediate) { 549 return false; 550 } 551 552 /** 553 * {@inheritDoc} 554 */ 555 @Override 556 public boolean dispatchUnhandledMove(View focused, int direction) { 557 return mFocused != null && 558 mFocused.dispatchUnhandledMove(focused, direction); 559 } 560 561 /** 562 * {@inheritDoc} 563 */ 564 public void clearChildFocus(View child) { 565 if (DBG) { 566 System.out.println(this + " clearChildFocus()"); 567 } 568 569 mFocused = null; 570 if (mParent != null) { 571 mParent.clearChildFocus(this); 572 } 573 } 574 575 /** 576 * {@inheritDoc} 577 */ 578 @Override 579 public void clearFocus() { 580 super.clearFocus(); 581 582 // clear any child focus if it exists 583 if (mFocused != null) { 584 mFocused.clearFocus(); 585 } 586 } 587 588 /** 589 * {@inheritDoc} 590 */ 591 @Override 592 void unFocus() { 593 if (DBG) { 594 System.out.println(this + " unFocus()"); 595 } 596 597 super.unFocus(); 598 if (mFocused != null) { 599 mFocused.unFocus(); 600 } 601 mFocused = null; 602 } 603 604 /** 605 * Returns the focused child of this view, if any. The child may have focus 606 * or contain focus. 607 * 608 * @return the focused child or null. 609 */ 610 public View getFocusedChild() { 611 return mFocused; 612 } 613 614 /** 615 * Returns true if this view has or contains focus 616 * 617 * @return true if this view has or contains focus 618 */ 619 @Override 620 public boolean hasFocus() { 621 return (mPrivateFlags & FOCUSED) != 0 || mFocused != null; 622 } 623 624 /* 625 * (non-Javadoc) 626 * 627 * @see android.view.View#findFocus() 628 */ 629 @Override 630 public View findFocus() { 631 if (DBG) { 632 System.out.println("Find focus in " + this + ": flags=" 633 + isFocused() + ", child=" + mFocused); 634 } 635 636 if (isFocused()) { 637 return this; 638 } 639 640 if (mFocused != null) { 641 return mFocused.findFocus(); 642 } 643 return null; 644 } 645 646 /** 647 * {@inheritDoc} 648 */ 649 @Override 650 public boolean hasFocusable() { 651 if ((mViewFlags & VISIBILITY_MASK) != VISIBLE) { 652 return false; 653 } 654 655 if (isFocusable()) { 656 return true; 657 } 658 659 final int descendantFocusability = getDescendantFocusability(); 660 if (descendantFocusability != FOCUS_BLOCK_DESCENDANTS) { 661 final int count = mChildrenCount; 662 final View[] children = mChildren; 663 664 for (int i = 0; i < count; i++) { 665 final View child = children[i]; 666 if (child.hasFocusable()) { 667 return true; 668 } 669 } 670 } 671 672 return false; 673 } 674 675 /** 676 * {@inheritDoc} 677 */ 678 @Override 679 public void addFocusables(ArrayList<View> views, int direction) { 680 addFocusables(views, direction, FOCUSABLES_TOUCH_MODE); 681 } 682 683 /** 684 * {@inheritDoc} 685 */ 686 @Override 687 public void addFocusables(ArrayList<View> views, int direction, int focusableMode) { 688 final int focusableCount = views.size(); 689 690 final int descendantFocusability = getDescendantFocusability(); 691 692 if (descendantFocusability != FOCUS_BLOCK_DESCENDANTS) { 693 final int count = mChildrenCount; 694 final View[] children = mChildren; 695 696 for (int i = 0; i < count; i++) { 697 final View child = children[i]; 698 if ((child.mViewFlags & VISIBILITY_MASK) == VISIBLE) { 699 child.addFocusables(views, direction, focusableMode); 700 } 701 } 702 } 703 704 // we add ourselves (if focusable) in all cases except for when we are 705 // FOCUS_AFTER_DESCENDANTS and there are some descendants focusable. this is 706 // to avoid the focus search finding layouts when a more precise search 707 // among the focusable children would be more interesting. 708 if ( 709 descendantFocusability != FOCUS_AFTER_DESCENDANTS || 710 // No focusable descendants 711 (focusableCount == views.size())) { 712 super.addFocusables(views, direction, focusableMode); 713 } 714 } 715 716 /** 717 * {@inheritDoc} 718 */ 719 @Override 720 public void dispatchWindowFocusChanged(boolean hasFocus) { 721 super.dispatchWindowFocusChanged(hasFocus); 722 final int count = mChildrenCount; 723 final View[] children = mChildren; 724 for (int i = 0; i < count; i++) { 725 children[i].dispatchWindowFocusChanged(hasFocus); 726 } 727 } 728 729 /** 730 * {@inheritDoc} 731 */ 732 @Override 733 public void addTouchables(ArrayList<View> views) { 734 super.addTouchables(views); 735 736 final int count = mChildrenCount; 737 final View[] children = mChildren; 738 739 for (int i = 0; i < count; i++) { 740 final View child = children[i]; 741 if ((child.mViewFlags & VISIBILITY_MASK) == VISIBLE) { 742 child.addTouchables(views); 743 } 744 } 745 } 746 747 /** 748 * {@inheritDoc} 749 */ 750 @Override 751 public void dispatchDisplayHint(int hint) { 752 super.dispatchDisplayHint(hint); 753 final int count = mChildrenCount; 754 final View[] children = mChildren; 755 for (int i = 0; i < count; i++) { 756 children[i].dispatchDisplayHint(hint); 757 } 758 } 759 760 /** 761 * @hide 762 * @param child 763 * @param visibility 764 */ 765 void onChildVisibilityChanged(View child, int visibility) { 766 if (mTransition != null) { 767 if (visibility == VISIBLE) { 768 mTransition.showChild(this, child); 769 } else { 770 mTransition.hideChild(this, child); 771 } 772 if (visibility != VISIBLE) { 773 // Only track this on disappearing views - appearing views are already visible 774 // and don't need special handling during drawChild() 775 if (mVisibilityChangingChildren == null) { 776 mVisibilityChangingChildren = new ArrayList<View>(); 777 } 778 mVisibilityChangingChildren.add(child); 779 if (mTransitioningViews != null && mTransitioningViews.contains(child)) { 780 addDisappearingView(child); 781 } 782 } 783 } 784 } 785 786 /** 787 * {@inheritDoc} 788 */ 789 @Override 790 protected void dispatchVisibilityChanged(View changedView, int visibility) { 791 super.dispatchVisibilityChanged(changedView, visibility); 792 final int count = mChildrenCount; 793 final View[] children = mChildren; 794 for (int i = 0; i < count; i++) { 795 children[i].dispatchVisibilityChanged(changedView, visibility); 796 } 797 } 798 799 /** 800 * {@inheritDoc} 801 */ 802 @Override 803 public void dispatchWindowVisibilityChanged(int visibility) { 804 super.dispatchWindowVisibilityChanged(visibility); 805 final int count = mChildrenCount; 806 final View[] children = mChildren; 807 for (int i = 0; i < count; i++) { 808 children[i].dispatchWindowVisibilityChanged(visibility); 809 } 810 } 811 812 /** 813 * {@inheritDoc} 814 */ 815 @Override 816 public void dispatchConfigurationChanged(Configuration newConfig) { 817 super.dispatchConfigurationChanged(newConfig); 818 final int count = mChildrenCount; 819 final View[] children = mChildren; 820 for (int i = 0; i < count; i++) { 821 children[i].dispatchConfigurationChanged(newConfig); 822 } 823 } 824 825 /** 826 * {@inheritDoc} 827 */ 828 public void recomputeViewAttributes(View child) { 829 ViewParent parent = mParent; 830 if (parent != null) parent.recomputeViewAttributes(this); 831 } 832 833 @Override 834 void dispatchCollectViewAttributes(int visibility) { 835 visibility |= mViewFlags&VISIBILITY_MASK; 836 super.dispatchCollectViewAttributes(visibility); 837 final int count = mChildrenCount; 838 final View[] children = mChildren; 839 for (int i = 0; i < count; i++) { 840 children[i].dispatchCollectViewAttributes(visibility); 841 } 842 } 843 844 /** 845 * {@inheritDoc} 846 */ 847 public void bringChildToFront(View child) { 848 int index = indexOfChild(child); 849 if (index >= 0) { 850 removeFromArray(index); 851 addInArray(child, mChildrenCount); 852 child.mParent = this; 853 } 854 } 855 856 /** 857 * {@inheritDoc} 858 * 859 * !!! TODO: write real docs 860 */ 861 @Override 862 public boolean dispatchDragEvent(DragEvent event) { 863 boolean retval = false; 864 final float tx = event.mX; 865 final float ty = event.mY; 866 867 ViewRoot root = getViewRoot(); 868 869 // Dispatch down the view hierarchy 870 switch (event.mAction) { 871 case DragEvent.ACTION_DRAG_STARTED: { 872 // clear state to recalculate which views we drag over 873 root.setDragFocus(event, null); 874 875 // Now dispatch down to our children, caching the responses 876 mChildAcceptsDrag = false; 877 final int count = mChildrenCount; 878 final View[] children = mChildren; 879 for (int i = 0; i < count; i++) { 880 final View child = children[i]; 881 if (child.getVisibility() == VISIBLE) { 882 final boolean handled = children[i].dispatchDragEvent(event); 883 children[i].mCanAcceptDrop = handled; 884 if (handled) { 885 mChildAcceptsDrag = true; 886 } 887 } 888 } 889 890 // Return HANDLED if one of our children can accept the drag 891 if (mChildAcceptsDrag) { 892 retval = true; 893 } 894 } break; 895 896 case DragEvent.ACTION_DRAG_ENDED: { 897 // Notify all of our children that the drag is over 898 final int count = mChildrenCount; 899 final View[] children = mChildren; 900 for (int i = 0; i < count; i++) { 901 final View child = children[i]; 902 if (child.getVisibility() == VISIBLE) { 903 child.dispatchDragEvent(event); 904 } 905 } 906 // We consider drag-ended to have been handled if one of our children 907 // had offered to handle the drag. 908 if (mChildAcceptsDrag) { 909 retval = true; 910 } 911 } break; 912 913 case DragEvent.ACTION_DRAG_LOCATION: { 914 // Find the [possibly new] drag target 915 final View target = findFrontmostDroppableChildAt(event.mX, event.mY, mLocalPoint); 916 917 // If we've changed apparent drag target, tell the view root which view 918 // we're over now. This will in turn send out DRAG_ENTERED / DRAG_EXITED 919 // notifications as appropriate. 920 if (mCurrentDragView != target) { 921 root.setDragFocus(event, target); 922 mCurrentDragView = target; 923 } 924 925 // Dispatch the actual drag location notice, localized into its coordinates 926 if (target != null) { 927 event.mX = mLocalPoint.x; 928 event.mY = mLocalPoint.y; 929 930 retval = target.dispatchDragEvent(event); 931 932 event.mX = tx; 933 event.mY = ty; 934 } 935 } break; 936 937 case DragEvent.ACTION_DROP: { 938 if (ViewDebug.DEBUG_DRAG) Log.d(View.VIEW_LOG_TAG, "Drop event: " + event); 939 View target = findFrontmostDroppableChildAt(event.mX, event.mY, mLocalPoint); 940 if (target != null) { 941 if (ViewDebug.DEBUG_DRAG) Log.d(View.VIEW_LOG_TAG, " dispatch drop to " + target); 942 event.mX = mLocalPoint.x; 943 event.mY = mLocalPoint.y; 944 retval = target.dispatchDragEvent(event); 945 event.mX = tx; 946 event.mY = ty; 947 } else { 948 if (ViewDebug.DEBUG_DRAG) { 949 Log.d(View.VIEW_LOG_TAG, " not dropped on an accepting view"); 950 } 951 } 952 } break; 953 } 954 955 // If none of our children could handle the event, try here 956 if (!retval) { 957 retval = onDragEvent(event); 958 } 959 return retval; 960 } 961 962 // Find the frontmost child view that lies under the given point, and calculate 963 // the position within its own local coordinate system. 964 View findFrontmostDroppableChildAt(float x, float y, PointF outLocalPoint) { 965 final int count = mChildrenCount; 966 final View[] children = mChildren; 967 for (int i = count - 1; i >= 0; i--) { 968 final View child = children[i]; 969 if (!child.mCanAcceptDrop) { 970 continue; 971 } 972 973 if (isTransformedTouchPointInView(x, y, child, outLocalPoint)) { 974 return child; 975 } 976 } 977 return null; 978 } 979 980 /** 981 * {@inheritDoc} 982 */ 983 @Override 984 public boolean dispatchKeyEventPreIme(KeyEvent event) { 985 if ((mPrivateFlags & (FOCUSED | HAS_BOUNDS)) == (FOCUSED | HAS_BOUNDS)) { 986 return super.dispatchKeyEventPreIme(event); 987 } else if (mFocused != null && (mFocused.mPrivateFlags & HAS_BOUNDS) == HAS_BOUNDS) { 988 return mFocused.dispatchKeyEventPreIme(event); 989 } 990 return false; 991 } 992 993 /** 994 * {@inheritDoc} 995 */ 996 @Override 997 public boolean dispatchKeyEvent(KeyEvent event) { 998 if ((mPrivateFlags & (FOCUSED | HAS_BOUNDS)) == (FOCUSED | HAS_BOUNDS)) { 999 return super.dispatchKeyEvent(event); 1000 } else if (mFocused != null && (mFocused.mPrivateFlags & HAS_BOUNDS) == HAS_BOUNDS) { 1001 return mFocused.dispatchKeyEvent(event); 1002 } 1003 return false; 1004 } 1005 1006 /** 1007 * {@inheritDoc} 1008 */ 1009 @Override 1010 public boolean dispatchKeyShortcutEvent(KeyEvent event) { 1011 if ((mPrivateFlags & (FOCUSED | HAS_BOUNDS)) == (FOCUSED | HAS_BOUNDS)) { 1012 return super.dispatchKeyShortcutEvent(event); 1013 } else if (mFocused != null && (mFocused.mPrivateFlags & HAS_BOUNDS) == HAS_BOUNDS) { 1014 return mFocused.dispatchKeyShortcutEvent(event); 1015 } 1016 return false; 1017 } 1018 1019 /** 1020 * {@inheritDoc} 1021 */ 1022 @Override 1023 public boolean dispatchTrackballEvent(MotionEvent event) { 1024 if ((mPrivateFlags & (FOCUSED | HAS_BOUNDS)) == (FOCUSED | HAS_BOUNDS)) { 1025 return super.dispatchTrackballEvent(event); 1026 } else if (mFocused != null && (mFocused.mPrivateFlags & HAS_BOUNDS) == HAS_BOUNDS) { 1027 return mFocused.dispatchTrackballEvent(event); 1028 } 1029 return false; 1030 } 1031 1032 /** 1033 * {@inheritDoc} 1034 */ 1035 @Override 1036 public boolean dispatchTouchEvent(MotionEvent ev) { 1037 if (!onFilterTouchEventForSecurity(ev)) { 1038 return false; 1039 } 1040 1041 final int action = ev.getAction(); 1042 final int actionMasked = action & MotionEvent.ACTION_MASK; 1043 1044 // Handle an initial down. 1045 if (actionMasked == MotionEvent.ACTION_DOWN) { 1046 // Throw away all previous state when starting a new touch gesture. 1047 // The framework may have dropped the up or cancel event for the previous gesture 1048 // due to an app switch, ANR, or some other state change. 1049 cancelAndClearTouchTargets(ev); 1050 resetTouchState(); 1051 } 1052 1053 // Check for interception. 1054 final boolean intercepted; 1055 if (actionMasked == MotionEvent.ACTION_DOWN || mFirstTouchTarget != null) { 1056 final boolean disallowIntercept = (mGroupFlags & FLAG_DISALLOW_INTERCEPT) != 0; 1057 if (!disallowIntercept) { 1058 intercepted = onInterceptTouchEvent(ev); 1059 ev.setAction(action); // restore action in case onInterceptTouchEvent() changed it 1060 } else { 1061 intercepted = false; 1062 } 1063 } else { 1064 intercepted = true; 1065 } 1066 1067 // Check for cancelation. 1068 final boolean canceled = resetCancelNextUpFlag(this) 1069 || actionMasked == MotionEvent.ACTION_CANCEL; 1070 1071 // Update list of touch targets for pointer down, if needed. 1072 final boolean split = (mGroupFlags & FLAG_SPLIT_MOTION_EVENTS) != 0; 1073 TouchTarget newTouchTarget = null; 1074 boolean alreadyDispatchedToNewTouchTarget = false; 1075 if (!canceled && !intercepted) { 1076 if (actionMasked == MotionEvent.ACTION_DOWN 1077 || (split && actionMasked == MotionEvent.ACTION_POINTER_DOWN)) { 1078 final int actionIndex = ev.getActionIndex(); // always 0 for down 1079 final int idBitsToAssign = split ? 1 << ev.getPointerId(actionIndex) 1080 : TouchTarget.ALL_POINTER_IDS; 1081 1082 // Clean up earlier touch targets for this pointer id in case they 1083 // have become out of sync. 1084 removePointersFromTouchTargets(idBitsToAssign); 1085 1086 final int childrenCount = mChildrenCount; 1087 if (childrenCount != 0) { 1088 // Find a child that can receive the event. Scan children from front to back. 1089 final View[] children = mChildren; 1090 final float x = ev.getX(actionIndex); 1091 final float y = ev.getY(actionIndex); 1092 1093 for (int i = childrenCount - 1; i >= 0; i--) { 1094 final View child = children[i]; 1095 if ((child.mViewFlags & VISIBILITY_MASK) != VISIBLE 1096 && child.getAnimation() == null) { 1097 // Skip invisible child unless it is animating. 1098 continue; 1099 } 1100 1101 if (!isTransformedTouchPointInView(x, y, child, null)) { 1102 // New pointer is out of child's bounds. 1103 continue; 1104 } 1105 1106 newTouchTarget = getTouchTarget(child); 1107 if (newTouchTarget != null) { 1108 // Child is already receiving touch within its bounds. 1109 // Give it the new pointer in addition to the ones it is handling. 1110 newTouchTarget.pointerIdBits |= idBitsToAssign; 1111 break; 1112 } 1113 1114 resetCancelNextUpFlag(child); 1115 if (dispatchTransformedTouchEvent(ev, false, child, idBitsToAssign)) { 1116 // Child wants to receive touch within its bounds. 1117 newTouchTarget = addTouchTarget(child, idBitsToAssign); 1118 alreadyDispatchedToNewTouchTarget = true; 1119 break; 1120 } 1121 } 1122 } 1123 1124 if (newTouchTarget == null && mFirstTouchTarget != null) { 1125 // Did not find a child to receive the event. 1126 // Assign the pointer to the least recently added target. 1127 newTouchTarget = mFirstTouchTarget; 1128 while (newTouchTarget.next != null) { 1129 newTouchTarget = newTouchTarget.next; 1130 } 1131 newTouchTarget.pointerIdBits |= idBitsToAssign; 1132 } 1133 } 1134 } 1135 1136 // Dispatch to touch targets. 1137 boolean handled = false; 1138 if (mFirstTouchTarget == null) { 1139 // No touch targets so treat this as an ordinary view. 1140 handled = dispatchTransformedTouchEvent(ev, canceled, null, 1141 TouchTarget.ALL_POINTER_IDS); 1142 } else { 1143 // Dispatch to touch targets, excluding the new touch target if we already 1144 // dispatched to it. Cancel touch targets if necessary. 1145 TouchTarget predecessor = null; 1146 TouchTarget target = mFirstTouchTarget; 1147 while (target != null) { 1148 final TouchTarget next = target.next; 1149 if (alreadyDispatchedToNewTouchTarget && target == newTouchTarget) { 1150 handled = true; 1151 } else { 1152 final boolean cancelChild = resetCancelNextUpFlag(target.child) || intercepted; 1153 if (dispatchTransformedTouchEvent(ev, cancelChild, 1154 target.child, target.pointerIdBits)) { 1155 handled = true; 1156 } 1157 if (cancelChild) { 1158 if (predecessor == null) { 1159 mFirstTouchTarget = next; 1160 } else { 1161 predecessor.next = next; 1162 } 1163 target.recycle(); 1164 target = next; 1165 continue; 1166 } 1167 } 1168 predecessor = target; 1169 target = next; 1170 } 1171 } 1172 1173 // Update list of touch targets for pointer up or cancel, if needed. 1174 if (canceled || actionMasked == MotionEvent.ACTION_UP) { 1175 resetTouchState(); 1176 } else if (split && actionMasked == MotionEvent.ACTION_POINTER_UP) { 1177 final int actionIndex = ev.getActionIndex(); 1178 final int idBitsToRemove = 1 << ev.getPointerId(actionIndex); 1179 removePointersFromTouchTargets(idBitsToRemove); 1180 } 1181 1182 return handled; 1183 } 1184 1185 /** 1186 * Resets all touch state in preparation for a new cycle. 1187 */ 1188 private void resetTouchState() { 1189 clearTouchTargets(); 1190 resetCancelNextUpFlag(this); 1191 mGroupFlags &= ~FLAG_DISALLOW_INTERCEPT; 1192 } 1193 1194 /** 1195 * Resets the cancel next up flag. 1196 * Returns true if the flag was previously set. 1197 */ 1198 private boolean resetCancelNextUpFlag(View view) { 1199 if ((view.mPrivateFlags & CANCEL_NEXT_UP_EVENT) != 0) { 1200 view.mPrivateFlags &= ~CANCEL_NEXT_UP_EVENT; 1201 return true; 1202 } 1203 return false; 1204 } 1205 1206 /** 1207 * Clears all touch targets. 1208 */ 1209 private void clearTouchTargets() { 1210 TouchTarget target = mFirstTouchTarget; 1211 if (target != null) { 1212 do { 1213 TouchTarget next = target.next; 1214 target.recycle(); 1215 target = next; 1216 } while (target != null); 1217 mFirstTouchTarget = null; 1218 } 1219 } 1220 1221 /** 1222 * Cancels and clears all touch targets. 1223 */ 1224 private void cancelAndClearTouchTargets(MotionEvent event) { 1225 if (mFirstTouchTarget != null) { 1226 boolean syntheticEvent = false; 1227 if (event == null) { 1228 final long now = SystemClock.uptimeMillis(); 1229 event = MotionEvent.obtain(now, now, 1230 MotionEvent.ACTION_CANCEL, 0.0f, 0.0f, 0); 1231 syntheticEvent = true; 1232 } 1233 1234 for (TouchTarget target = mFirstTouchTarget; target != null; target = target.next) { 1235 resetCancelNextUpFlag(target.child); 1236 dispatchTransformedTouchEvent(event, true, target.child, target.pointerIdBits); 1237 } 1238 clearTouchTargets(); 1239 1240 if (syntheticEvent) { 1241 event.recycle(); 1242 } 1243 } 1244 } 1245 1246 /** 1247 * Gets the touch target for specified child view. 1248 * Returns null if not found. 1249 */ 1250 private TouchTarget getTouchTarget(View child) { 1251 for (TouchTarget target = mFirstTouchTarget; target != null; target = target.next) { 1252 if (target.child == child) { 1253 return target; 1254 } 1255 } 1256 return null; 1257 } 1258 1259 /** 1260 * Adds a touch target for specified child to the beginning of the list. 1261 * Assumes the target child is not already present. 1262 */ 1263 private TouchTarget addTouchTarget(View child, int pointerIdBits) { 1264 TouchTarget target = TouchTarget.obtain(child, pointerIdBits); 1265 target.next = mFirstTouchTarget; 1266 mFirstTouchTarget = target; 1267 return target; 1268 } 1269 1270 /** 1271 * Removes the pointer ids from consideration. 1272 */ 1273 private void removePointersFromTouchTargets(int pointerIdBits) { 1274 TouchTarget predecessor = null; 1275 TouchTarget target = mFirstTouchTarget; 1276 while (target != null) { 1277 final TouchTarget next = target.next; 1278 if ((target.pointerIdBits & pointerIdBits) != 0) { 1279 target.pointerIdBits &= ~pointerIdBits; 1280 if (target.pointerIdBits == 0) { 1281 if (predecessor == null) { 1282 mFirstTouchTarget = next; 1283 } else { 1284 predecessor.next = next; 1285 } 1286 target.recycle(); 1287 target = next; 1288 continue; 1289 } 1290 } 1291 predecessor = target; 1292 target = next; 1293 } 1294 } 1295 1296 /** 1297 * Returns true if a child view contains the specified point when transformed 1298 * into its coordinate space. 1299 * Child must not be null. 1300 */ 1301 private boolean isTransformedTouchPointInView(float x, float y, View child, 1302 PointF outLocalPoint) { 1303 float localX = x + mScrollX - child.mLeft; 1304 float localY = y + mScrollY - child.mTop; 1305 if (! child.hasIdentityMatrix() && mAttachInfo != null) { 1306 final float[] localXY = mAttachInfo.mTmpTransformLocation; 1307 localXY[0] = localX; 1308 localXY[1] = localY; 1309 child.getInverseMatrix().mapPoints(localXY); 1310 localX = localXY[0]; 1311 localY = localXY[1]; 1312 } 1313 final boolean isInView = child.pointInView(localX, localY); 1314 if (isInView && outLocalPoint != null) { 1315 outLocalPoint.set(localX, localY); 1316 } 1317 return isInView; 1318 } 1319 1320 /** 1321 * Transforms a motion event into the coordinate space of a particular child view, 1322 * filters out irrelevant pointer ids, and overrides its action if necessary. 1323 * If child is null, assumes the MotionEvent will be sent to this ViewGroup instead. 1324 */ 1325 private boolean dispatchTransformedTouchEvent(MotionEvent event, boolean cancel, 1326 View child, int desiredPointerIdBits) { 1327 final boolean handled; 1328 1329 // Canceling motions is a special case. We don't need to perform any transformations 1330 // or filtering. The important part is the action, not the contents. 1331 final int oldAction = event.getAction(); 1332 if (cancel || oldAction == MotionEvent.ACTION_CANCEL) { 1333 event.setAction(MotionEvent.ACTION_CANCEL); 1334 if (child == null) { 1335 handled = super.dispatchTouchEvent(event); 1336 } else { 1337 handled = child.dispatchTouchEvent(event); 1338 } 1339 event.setAction(oldAction); 1340 return handled; 1341 } 1342 1343 // Calculate the number of pointers to deliver. 1344 final int oldPointerCount = event.getPointerCount(); 1345 int newPointerCount = 0; 1346 if (desiredPointerIdBits == TouchTarget.ALL_POINTER_IDS) { 1347 newPointerCount = oldPointerCount; 1348 } else { 1349 for (int i = 0; i < oldPointerCount; i++) { 1350 final int pointerId = event.getPointerId(i); 1351 final int pointerIdBit = 1 << pointerId; 1352 if ((pointerIdBit & desiredPointerIdBits) != 0) { 1353 newPointerCount += 1; 1354 } 1355 } 1356 } 1357 1358 // If for some reason we ended up in an inconsistent state where it looks like we 1359 // might produce a motion event with no pointers in it, then drop the event. 1360 if (newPointerCount == 0) { 1361 return false; 1362 } 1363 1364 // If the number of pointers is the same and we don't need to perform any fancy 1365 // irreversible transformations, then we can reuse the motion event for this 1366 // dispatch as long as we are careful to revert any changes we make. 1367 final boolean reuse = newPointerCount == oldPointerCount 1368 && (child == null || child.hasIdentityMatrix()); 1369 if (reuse) { 1370 if (child == null) { 1371 handled = super.dispatchTouchEvent(event); 1372 } else { 1373 final float offsetX = mScrollX - child.mLeft; 1374 final float offsetY = mScrollY - child.mTop; 1375 event.offsetLocation(offsetX, offsetY); 1376 1377 handled = child.dispatchTouchEvent(event); 1378 1379 event.offsetLocation(-offsetX, -offsetY); 1380 } 1381 return handled; 1382 } 1383 1384 // Make a copy of the event. 1385 // If the number of pointers is different, then we need to filter out irrelevant pointers 1386 // as we make a copy of the motion event. 1387 MotionEvent transformedEvent; 1388 if (newPointerCount == oldPointerCount) { 1389 transformedEvent = MotionEvent.obtain(event); 1390 } else { 1391 growTmpPointerArrays(newPointerCount); 1392 final int[] newPointerIndexMap = mTmpPointerIndexMap; 1393 final int[] newPointerIds = mTmpPointerIds; 1394 final MotionEvent.PointerCoords[] newPointerCoords = mTmpPointerCoords; 1395 1396 int newPointerIndex = 0; 1397 int oldPointerIndex = 0; 1398 while (newPointerIndex < newPointerCount) { 1399 final int pointerId = event.getPointerId(oldPointerIndex); 1400 final int pointerIdBits = 1 << pointerId; 1401 if ((pointerIdBits & desiredPointerIdBits) != 0) { 1402 newPointerIndexMap[newPointerIndex] = oldPointerIndex; 1403 newPointerIds[newPointerIndex] = pointerId; 1404 if (newPointerCoords[newPointerIndex] == null) { 1405 newPointerCoords[newPointerIndex] = new MotionEvent.PointerCoords(); 1406 } 1407 1408 newPointerIndex += 1; 1409 } 1410 oldPointerIndex += 1; 1411 } 1412 1413 final int newAction; 1414 if (cancel) { 1415 newAction = MotionEvent.ACTION_CANCEL; 1416 } else { 1417 final int oldMaskedAction = oldAction & MotionEvent.ACTION_MASK; 1418 if (oldMaskedAction == MotionEvent.ACTION_POINTER_DOWN 1419 || oldMaskedAction == MotionEvent.ACTION_POINTER_UP) { 1420 final int changedPointerId = event.getPointerId( 1421 (oldAction & MotionEvent.ACTION_POINTER_INDEX_MASK) 1422 >> MotionEvent.ACTION_POINTER_INDEX_SHIFT); 1423 final int changedPointerIdBits = 1 << changedPointerId; 1424 if ((changedPointerIdBits & desiredPointerIdBits) != 0) { 1425 if (newPointerCount == 1) { 1426 // The first/last pointer went down/up. 1427 newAction = oldMaskedAction == MotionEvent.ACTION_POINTER_DOWN 1428 ? MotionEvent.ACTION_DOWN : MotionEvent.ACTION_UP; 1429 } else { 1430 // A secondary pointer went down/up. 1431 int newChangedPointerIndex = 0; 1432 while (newPointerIds[newChangedPointerIndex] != changedPointerId) { 1433 newChangedPointerIndex += 1; 1434 } 1435 newAction = oldMaskedAction | (newChangedPointerIndex 1436 << MotionEvent.ACTION_POINTER_INDEX_SHIFT); 1437 } 1438 } else { 1439 // An unrelated pointer changed. 1440 newAction = MotionEvent.ACTION_MOVE; 1441 } 1442 } else { 1443 // Simple up/down/cancel/move motion action. 1444 newAction = oldMaskedAction; 1445 } 1446 } 1447 1448 transformedEvent = null; 1449 final int historySize = event.getHistorySize(); 1450 for (int historyIndex = 0; historyIndex <= historySize; historyIndex++) { 1451 for (newPointerIndex = 0; newPointerIndex < newPointerCount; newPointerIndex++) { 1452 final MotionEvent.PointerCoords c = newPointerCoords[newPointerIndex]; 1453 oldPointerIndex = newPointerIndexMap[newPointerIndex]; 1454 if (historyIndex != historySize) { 1455 event.getHistoricalPointerCoords(oldPointerIndex, historyIndex, c); 1456 } else { 1457 event.getPointerCoords(oldPointerIndex, c); 1458 } 1459 } 1460 1461 final long eventTime; 1462 if (historyIndex != historySize) { 1463 eventTime = event.getHistoricalEventTime(historyIndex); 1464 } else { 1465 eventTime = event.getEventTime(); 1466 } 1467 1468 if (transformedEvent == null) { 1469 transformedEvent = MotionEvent.obtain( 1470 event.getDownTime(), eventTime, newAction, 1471 newPointerCount, newPointerIds, newPointerCoords, 1472 event.getMetaState(), event.getXPrecision(), event.getYPrecision(), 1473 event.getDeviceId(), event.getEdgeFlags(), event.getSource(), 1474 event.getFlags()); 1475 } else { 1476 transformedEvent.addBatch(eventTime, newPointerCoords, 0); 1477 } 1478 } 1479 } 1480 1481 // Perform any necessary transformations and dispatch. 1482 if (child == null) { 1483 handled = super.dispatchTouchEvent(transformedEvent); 1484 } else { 1485 final float offsetX = mScrollX - child.mLeft; 1486 final float offsetY = mScrollY - child.mTop; 1487 transformedEvent.offsetLocation(offsetX, offsetY); 1488 if (! child.hasIdentityMatrix()) { 1489 transformedEvent.transform(child.getInverseMatrix()); 1490 } 1491 1492 handled = child.dispatchTouchEvent(transformedEvent); 1493 } 1494 1495 // Done. 1496 transformedEvent.recycle(); 1497 return handled; 1498 } 1499 1500 /** 1501 * Enlarge the temporary pointer arrays for splitting pointers. 1502 * May discard contents (but keeps PointerCoords objects to avoid reallocating them). 1503 */ 1504 private void growTmpPointerArrays(int desiredCapacity) { 1505 final MotionEvent.PointerCoords[] oldTmpPointerCoords = mTmpPointerCoords; 1506 int capacity; 1507 if (oldTmpPointerCoords != null) { 1508 capacity = oldTmpPointerCoords.length; 1509 if (desiredCapacity <= capacity) { 1510 return; 1511 } 1512 } else { 1513 capacity = 4; 1514 } 1515 1516 while (capacity < desiredCapacity) { 1517 capacity *= 2; 1518 } 1519 1520 mTmpPointerIndexMap = new int[capacity]; 1521 mTmpPointerIds = new int[capacity]; 1522 mTmpPointerCoords = new MotionEvent.PointerCoords[capacity]; 1523 1524 if (oldTmpPointerCoords != null) { 1525 System.arraycopy(oldTmpPointerCoords, 0, mTmpPointerCoords, 0, 1526 oldTmpPointerCoords.length); 1527 } 1528 } 1529 1530 /** 1531 * Enable or disable the splitting of MotionEvents to multiple children during touch event 1532 * dispatch. This behavior is disabled by default. 1533 * 1534 * <p>When this option is enabled MotionEvents may be split and dispatched to different child 1535 * views depending on where each pointer initially went down. This allows for user interactions 1536 * such as scrolling two panes of content independently, chording of buttons, and performing 1537 * independent gestures on different pieces of content. 1538 * 1539 * @param split <code>true</code> to allow MotionEvents to be split and dispatched to multiple 1540 * child views. <code>false</code> to only allow one child view to be the target of 1541 * any MotionEvent received by this ViewGroup. 1542 */ 1543 public void setMotionEventSplittingEnabled(boolean split) { 1544 // TODO Applications really shouldn't change this setting mid-touch event, 1545 // but perhaps this should handle that case and send ACTION_CANCELs to any child views 1546 // with gestures in progress when this is changed. 1547 if (split) { 1548 mGroupFlags |= FLAG_SPLIT_MOTION_EVENTS; 1549 } else { 1550 mGroupFlags &= ~FLAG_SPLIT_MOTION_EVENTS; 1551 } 1552 } 1553 1554 /** 1555 * @return true if MotionEvents dispatched to this ViewGroup can be split to multiple children. 1556 */ 1557 public boolean isMotionEventSplittingEnabled() { 1558 return (mGroupFlags & FLAG_SPLIT_MOTION_EVENTS) == FLAG_SPLIT_MOTION_EVENTS; 1559 } 1560 1561 /** 1562 * {@inheritDoc} 1563 */ 1564 public void requestDisallowInterceptTouchEvent(boolean disallowIntercept) { 1565 1566 if (disallowIntercept == ((mGroupFlags & FLAG_DISALLOW_INTERCEPT) != 0)) { 1567 // We're already in this state, assume our ancestors are too 1568 return; 1569 } 1570 1571 if (disallowIntercept) { 1572 mGroupFlags |= FLAG_DISALLOW_INTERCEPT; 1573 } else { 1574 mGroupFlags &= ~FLAG_DISALLOW_INTERCEPT; 1575 } 1576 1577 // Pass it up to our parent 1578 if (mParent != null) { 1579 mParent.requestDisallowInterceptTouchEvent(disallowIntercept); 1580 } 1581 } 1582 1583 /** 1584 * Implement this method to intercept all touch screen motion events. This 1585 * allows you to watch events as they are dispatched to your children, and 1586 * take ownership of the current gesture at any point. 1587 * 1588 * <p>Using this function takes some care, as it has a fairly complicated 1589 * interaction with {@link View#onTouchEvent(MotionEvent) 1590 * View.onTouchEvent(MotionEvent)}, and using it requires implementing 1591 * that method as well as this one in the correct way. Events will be 1592 * received in the following order: 1593 * 1594 * <ol> 1595 * <li> You will receive the down event here. 1596 * <li> The down event will be handled either by a child of this view 1597 * group, or given to your own onTouchEvent() method to handle; this means 1598 * you should implement onTouchEvent() to return true, so you will 1599 * continue to see the rest of the gesture (instead of looking for 1600 * a parent view to handle it). Also, by returning true from 1601 * onTouchEvent(), you will not receive any following 1602 * events in onInterceptTouchEvent() and all touch processing must 1603 * happen in onTouchEvent() like normal. 1604 * <li> For as long as you return false from this function, each following 1605 * event (up to and including the final up) will be delivered first here 1606 * and then to the target's onTouchEvent(). 1607 * <li> If you return true from here, you will not receive any 1608 * following events: the target view will receive the same event but 1609 * with the action {@link MotionEvent#ACTION_CANCEL}, and all further 1610 * events will be delivered to your onTouchEvent() method and no longer 1611 * appear here. 1612 * </ol> 1613 * 1614 * @param ev The motion event being dispatched down the hierarchy. 1615 * @return Return true to steal motion events from the children and have 1616 * them dispatched to this ViewGroup through onTouchEvent(). 1617 * The current target will receive an ACTION_CANCEL event, and no further 1618 * messages will be delivered here. 1619 */ 1620 public boolean onInterceptTouchEvent(MotionEvent ev) { 1621 return false; 1622 } 1623 1624 /** 1625 * {@inheritDoc} 1626 * 1627 * Looks for a view to give focus to respecting the setting specified by 1628 * {@link #getDescendantFocusability()}. 1629 * 1630 * Uses {@link #onRequestFocusInDescendants(int, android.graphics.Rect)} to 1631 * find focus within the children of this group when appropriate. 1632 * 1633 * @see #FOCUS_BEFORE_DESCENDANTS 1634 * @see #FOCUS_AFTER_DESCENDANTS 1635 * @see #FOCUS_BLOCK_DESCENDANTS 1636 * @see #onRequestFocusInDescendants 1637 */ 1638 @Override 1639 public boolean requestFocus(int direction, Rect previouslyFocusedRect) { 1640 if (DBG) { 1641 System.out.println(this + " ViewGroup.requestFocus direction=" 1642 + direction); 1643 } 1644 int descendantFocusability = getDescendantFocusability(); 1645 1646 switch (descendantFocusability) { 1647 case FOCUS_BLOCK_DESCENDANTS: 1648 return super.requestFocus(direction, previouslyFocusedRect); 1649 case FOCUS_BEFORE_DESCENDANTS: { 1650 final boolean took = super.requestFocus(direction, previouslyFocusedRect); 1651 return took ? took : onRequestFocusInDescendants(direction, previouslyFocusedRect); 1652 } 1653 case FOCUS_AFTER_DESCENDANTS: { 1654 final boolean took = onRequestFocusInDescendants(direction, previouslyFocusedRect); 1655 return took ? took : super.requestFocus(direction, previouslyFocusedRect); 1656 } 1657 default: 1658 throw new IllegalStateException("descendant focusability must be " 1659 + "one of FOCUS_BEFORE_DESCENDANTS, FOCUS_AFTER_DESCENDANTS, FOCUS_BLOCK_DESCENDANTS " 1660 + "but is " + descendantFocusability); 1661 } 1662 } 1663 1664 /** 1665 * Look for a descendant to call {@link View#requestFocus} on. 1666 * Called by {@link ViewGroup#requestFocus(int, android.graphics.Rect)} 1667 * when it wants to request focus within its children. Override this to 1668 * customize how your {@link ViewGroup} requests focus within its children. 1669 * @param direction One of FOCUS_UP, FOCUS_DOWN, FOCUS_LEFT, and FOCUS_RIGHT 1670 * @param previouslyFocusedRect The rectangle (in this View's coordinate system) 1671 * to give a finer grained hint about where focus is coming from. May be null 1672 * if there is no hint. 1673 * @return Whether focus was taken. 1674 */ 1675 @SuppressWarnings({"ConstantConditions"}) 1676 protected boolean onRequestFocusInDescendants(int direction, 1677 Rect previouslyFocusedRect) { 1678 int index; 1679 int increment; 1680 int end; 1681 int count = mChildrenCount; 1682 if ((direction & FOCUS_FORWARD) != 0) { 1683 index = 0; 1684 increment = 1; 1685 end = count; 1686 } else { 1687 index = count - 1; 1688 increment = -1; 1689 end = -1; 1690 } 1691 final View[] children = mChildren; 1692 for (int i = index; i != end; i += increment) { 1693 View child = children[i]; 1694 if ((child.mViewFlags & VISIBILITY_MASK) == VISIBLE) { 1695 if (child.requestFocus(direction, previouslyFocusedRect)) { 1696 return true; 1697 } 1698 } 1699 } 1700 return false; 1701 } 1702 1703 /** 1704 * {@inheritDoc} 1705 * 1706 * @hide 1707 */ 1708 @Override 1709 public void dispatchStartTemporaryDetach() { 1710 super.dispatchStartTemporaryDetach(); 1711 final int count = mChildrenCount; 1712 final View[] children = mChildren; 1713 for (int i = 0; i < count; i++) { 1714 children[i].dispatchStartTemporaryDetach(); 1715 } 1716 } 1717 1718 /** 1719 * {@inheritDoc} 1720 * 1721 * @hide 1722 */ 1723 @Override 1724 public void dispatchFinishTemporaryDetach() { 1725 super.dispatchFinishTemporaryDetach(); 1726 final int count = mChildrenCount; 1727 final View[] children = mChildren; 1728 for (int i = 0; i < count; i++) { 1729 children[i].dispatchFinishTemporaryDetach(); 1730 } 1731 } 1732 1733 /** 1734 * {@inheritDoc} 1735 */ 1736 @Override 1737 void dispatchAttachedToWindow(AttachInfo info, int visibility) { 1738 super.dispatchAttachedToWindow(info, visibility); 1739 visibility |= mViewFlags & VISIBILITY_MASK; 1740 final int count = mChildrenCount; 1741 final View[] children = mChildren; 1742 for (int i = 0; i < count; i++) { 1743 children[i].dispatchAttachedToWindow(info, visibility); 1744 } 1745 } 1746 1747 @Override 1748 public boolean dispatchPopulateAccessibilityEvent(AccessibilityEvent event) { 1749 boolean populated = false; 1750 for (int i = 0, count = getChildCount(); i < count; i++) { 1751 populated |= getChildAt(i).dispatchPopulateAccessibilityEvent(event); 1752 } 1753 return populated; 1754 } 1755 1756 /** 1757 * {@inheritDoc} 1758 */ 1759 @Override 1760 void dispatchDetachedFromWindow() { 1761 // If we still have a touch target, we are still in the process of 1762 // dispatching motion events to a child; we need to get rid of that 1763 // child to avoid dispatching events to it after the window is torn 1764 // down. To make sure we keep the child in a consistent state, we 1765 // first send it an ACTION_CANCEL motion event. 1766 cancelAndClearTouchTargets(null); 1767 1768 final int count = mChildrenCount; 1769 final View[] children = mChildren; 1770 for (int i = 0; i < count; i++) { 1771 children[i].dispatchDetachedFromWindow(); 1772 } 1773 super.dispatchDetachedFromWindow(); 1774 } 1775 1776 /** 1777 * {@inheritDoc} 1778 */ 1779 @Override 1780 public void setPadding(int left, int top, int right, int bottom) { 1781 super.setPadding(left, top, right, bottom); 1782 1783 if ((mPaddingLeft | mPaddingTop | mPaddingRight | mPaddingRight) != 0) { 1784 mGroupFlags |= FLAG_PADDING_NOT_NULL; 1785 } else { 1786 mGroupFlags &= ~FLAG_PADDING_NOT_NULL; 1787 } 1788 } 1789 1790 /** 1791 * {@inheritDoc} 1792 */ 1793 @Override 1794 protected void dispatchSaveInstanceState(SparseArray<Parcelable> container) { 1795 super.dispatchSaveInstanceState(container); 1796 final int count = mChildrenCount; 1797 final View[] children = mChildren; 1798 for (int i = 0; i < count; i++) { 1799 View c = children[i]; 1800 if ((c.mViewFlags & PARENT_SAVE_DISABLED_MASK) != PARENT_SAVE_DISABLED) { 1801 c.dispatchSaveInstanceState(container); 1802 } 1803 } 1804 } 1805 1806 /** 1807 * Perform dispatching of a {@link #saveHierarchyState freeze()} to only this view, 1808 * not to its children. For use when overriding 1809 * {@link #dispatchSaveInstanceState dispatchFreeze()} to allow subclasses to freeze 1810 * their own state but not the state of their children. 1811 * 1812 * @param container the container 1813 */ 1814 protected void dispatchFreezeSelfOnly(SparseArray<Parcelable> container) { 1815 super.dispatchSaveInstanceState(container); 1816 } 1817 1818 /** 1819 * {@inheritDoc} 1820 */ 1821 @Override 1822 protected void dispatchRestoreInstanceState(SparseArray<Parcelable> container) { 1823 super.dispatchRestoreInstanceState(container); 1824 final int count = mChildrenCount; 1825 final View[] children = mChildren; 1826 for (int i = 0; i < count; i++) { 1827 View c = children[i]; 1828 if ((c.mViewFlags & PARENT_SAVE_DISABLED_MASK) != PARENT_SAVE_DISABLED) { 1829 c.dispatchRestoreInstanceState(container); 1830 } 1831 } 1832 } 1833 1834 /** 1835 * Perform dispatching of a {@link #restoreHierarchyState thaw()} to only this view, 1836 * not to its children. For use when overriding 1837 * {@link #dispatchRestoreInstanceState dispatchThaw()} to allow subclasses to thaw 1838 * their own state but not the state of their children. 1839 * 1840 * @param container the container 1841 */ 1842 protected void dispatchThawSelfOnly(SparseArray<Parcelable> container) { 1843 super.dispatchRestoreInstanceState(container); 1844 } 1845 1846 /** 1847 * Enables or disables the drawing cache for each child of this view group. 1848 * 1849 * @param enabled true to enable the cache, false to dispose of it 1850 */ 1851 protected void setChildrenDrawingCacheEnabled(boolean enabled) { 1852 if (enabled || (mPersistentDrawingCache & PERSISTENT_ALL_CACHES) != PERSISTENT_ALL_CACHES) { 1853 final View[] children = mChildren; 1854 final int count = mChildrenCount; 1855 for (int i = 0; i < count; i++) { 1856 children[i].setDrawingCacheEnabled(enabled); 1857 } 1858 } 1859 } 1860 1861 @Override 1862 protected void onAnimationStart() { 1863 super.onAnimationStart(); 1864 1865 // When this ViewGroup's animation starts, build the cache for the children 1866 if ((mGroupFlags & FLAG_ANIMATION_CACHE) == FLAG_ANIMATION_CACHE) { 1867 final int count = mChildrenCount; 1868 final View[] children = mChildren; 1869 1870 for (int i = 0; i < count; i++) { 1871 final View child = children[i]; 1872 if ((child.mViewFlags & VISIBILITY_MASK) == VISIBLE) { 1873 child.setDrawingCacheEnabled(true); 1874 child.buildDrawingCache(true); 1875 } 1876 } 1877 1878 mGroupFlags |= FLAG_CHILDREN_DRAWN_WITH_CACHE; 1879 } 1880 } 1881 1882 @Override 1883 protected void onAnimationEnd() { 1884 super.onAnimationEnd(); 1885 1886 // When this ViewGroup's animation ends, destroy the cache of the children 1887 if ((mGroupFlags & FLAG_ANIMATION_CACHE) == FLAG_ANIMATION_CACHE) { 1888 mGroupFlags &= ~FLAG_CHILDREN_DRAWN_WITH_CACHE; 1889 1890 if ((mPersistentDrawingCache & PERSISTENT_ANIMATION_CACHE) == 0) { 1891 setChildrenDrawingCacheEnabled(false); 1892 } 1893 } 1894 } 1895 1896 @Override 1897 Bitmap createSnapshot(Bitmap.Config quality, int backgroundColor, boolean skipChildren) { 1898 int count = mChildrenCount; 1899 int[] visibilities = null; 1900 1901 if (skipChildren) { 1902 visibilities = new int[count]; 1903 for (int i = 0; i < count; i++) { 1904 View child = getChildAt(i); 1905 visibilities[i] = child.getVisibility(); 1906 if (visibilities[i] == View.VISIBLE) { 1907 child.setVisibility(INVISIBLE); 1908 } 1909 } 1910 } 1911 1912 Bitmap b = super.createSnapshot(quality, backgroundColor, skipChildren); 1913 1914 if (skipChildren) { 1915 for (int i = 0; i < count; i++) { 1916 getChildAt(i).setVisibility(visibilities[i]); 1917 } 1918 } 1919 1920 return b; 1921 } 1922 1923 /** 1924 * {@inheritDoc} 1925 */ 1926 @Override 1927 protected void dispatchDraw(Canvas canvas) { 1928 final int count = mChildrenCount; 1929 final View[] children = mChildren; 1930 int flags = mGroupFlags; 1931 1932 if ((flags & FLAG_RUN_ANIMATION) != 0 && canAnimate()) { 1933 final boolean cache = (mGroupFlags & FLAG_ANIMATION_CACHE) == FLAG_ANIMATION_CACHE; 1934 1935 for (int i = 0; i < count; i++) { 1936 final View child = children[i]; 1937 if ((child.mViewFlags & VISIBILITY_MASK) == VISIBLE) { 1938 final LayoutParams params = child.getLayoutParams(); 1939 attachLayoutAnimationParameters(child, params, i, count); 1940 bindLayoutAnimation(child); 1941 if (cache) { 1942 child.setDrawingCacheEnabled(true); 1943 child.buildDrawingCache(true); 1944 } 1945 } 1946 } 1947 1948 final LayoutAnimationController controller = mLayoutAnimationController; 1949 if (controller.willOverlap()) { 1950 mGroupFlags |= FLAG_OPTIMIZE_INVALIDATE; 1951 } 1952 1953 controller.start(); 1954 1955 mGroupFlags &= ~FLAG_RUN_ANIMATION; 1956 mGroupFlags &= ~FLAG_ANIMATION_DONE; 1957 1958 if (cache) { 1959 mGroupFlags |= FLAG_CHILDREN_DRAWN_WITH_CACHE; 1960 } 1961 1962 if (mAnimationListener != null) { 1963 mAnimationListener.onAnimationStart(controller.getAnimation()); 1964 } 1965 } 1966 1967 int saveCount = 0; 1968 final boolean clipToPadding = (flags & CLIP_TO_PADDING_MASK) == CLIP_TO_PADDING_MASK; 1969 if (clipToPadding) { 1970 saveCount = canvas.save(); 1971 canvas.clipRect(mScrollX + mPaddingLeft, mScrollY + mPaddingTop, 1972 mScrollX + mRight - mLeft - mPaddingRight, 1973 mScrollY + mBottom - mTop - mPaddingBottom); 1974 1975 } 1976 1977 // We will draw our child's animation, let's reset the flag 1978 mPrivateFlags &= ~DRAW_ANIMATION; 1979 mGroupFlags &= ~FLAG_INVALIDATE_REQUIRED; 1980 1981 boolean more = false; 1982 final long drawingTime = getDrawingTime(); 1983 1984 if ((flags & FLAG_USE_CHILD_DRAWING_ORDER) == 0) { 1985 for (int i = 0; i < count; i++) { 1986 final View child = children[i]; 1987 if ((child.mViewFlags & VISIBILITY_MASK) == VISIBLE || child.getAnimation() != null) { 1988 more |= drawChild(canvas, child, drawingTime); 1989 } 1990 } 1991 } else { 1992 for (int i = 0; i < count; i++) { 1993 final View child = children[getChildDrawingOrder(count, i)]; 1994 if ((child.mViewFlags & VISIBILITY_MASK) == VISIBLE || child.getAnimation() != null) { 1995 more |= drawChild(canvas, child, drawingTime); 1996 } 1997 } 1998 } 1999 2000 // Draw any disappearing views that have animations 2001 if (mDisappearingChildren != null) { 2002 final ArrayList<View> disappearingChildren = mDisappearingChildren; 2003 final int disappearingCount = disappearingChildren.size() - 1; 2004 // Go backwards -- we may delete as animations finish 2005 for (int i = disappearingCount; i >= 0; i--) { 2006 final View child = disappearingChildren.get(i); 2007 more |= drawChild(canvas, child, drawingTime); 2008 } 2009 } 2010 2011 if (clipToPadding) { 2012 canvas.restoreToCount(saveCount); 2013 } 2014 2015 // mGroupFlags might have been updated by drawChild() 2016 flags = mGroupFlags; 2017 2018 if ((flags & FLAG_INVALIDATE_REQUIRED) == FLAG_INVALIDATE_REQUIRED) { 2019 invalidate(); 2020 } 2021 2022 if ((flags & FLAG_ANIMATION_DONE) == 0 && (flags & FLAG_NOTIFY_ANIMATION_LISTENER) == 0 && 2023 mLayoutAnimationController.isDone() && !more) { 2024 // We want to erase the drawing cache and notify the listener after the 2025 // next frame is drawn because one extra invalidate() is caused by 2026 // drawChild() after the animation is over 2027 mGroupFlags |= FLAG_NOTIFY_ANIMATION_LISTENER; 2028 final Runnable end = new Runnable() { 2029 public void run() { 2030 notifyAnimationListener(); 2031 } 2032 }; 2033 post(end); 2034 } 2035 } 2036 2037 /** 2038 * Returns the index of the child to draw for this iteration. Override this 2039 * if you want to change the drawing order of children. By default, it 2040 * returns i. 2041 * <p> 2042 * NOTE: In order for this method to be called, you must enable child ordering 2043 * first by calling {@link #setChildrenDrawingOrderEnabled(boolean)}. 2044 * 2045 * @param i The current iteration. 2046 * @return The index of the child to draw this iteration. 2047 * 2048 * @see #setChildrenDrawingOrderEnabled(boolean) 2049 * @see #isChildrenDrawingOrderEnabled() 2050 */ 2051 protected int getChildDrawingOrder(int childCount, int i) { 2052 return i; 2053 } 2054 2055 private void notifyAnimationListener() { 2056 mGroupFlags &= ~FLAG_NOTIFY_ANIMATION_LISTENER; 2057 mGroupFlags |= FLAG_ANIMATION_DONE; 2058 2059 if (mAnimationListener != null) { 2060 final Runnable end = new Runnable() { 2061 public void run() { 2062 mAnimationListener.onAnimationEnd(mLayoutAnimationController.getAnimation()); 2063 } 2064 }; 2065 post(end); 2066 } 2067 2068 if ((mGroupFlags & FLAG_ANIMATION_CACHE) == FLAG_ANIMATION_CACHE) { 2069 mGroupFlags &= ~FLAG_CHILDREN_DRAWN_WITH_CACHE; 2070 if ((mPersistentDrawingCache & PERSISTENT_ANIMATION_CACHE) == 0) { 2071 setChildrenDrawingCacheEnabled(false); 2072 } 2073 } 2074 2075 invalidate(); 2076 } 2077 2078 /** 2079 * Draw one child of this View Group. This method is responsible for getting 2080 * the canvas in the right state. This includes clipping, translating so 2081 * that the child's scrolled origin is at 0, 0, and applying any animation 2082 * transformations. 2083 * 2084 * @param canvas The canvas on which to draw the child 2085 * @param child Who to draw 2086 * @param drawingTime The time at which draw is occuring 2087 * @return True if an invalidate() was issued 2088 */ 2089 protected boolean drawChild(Canvas canvas, View child, long drawingTime) { 2090 boolean more = false; 2091 2092 final int cl = child.mLeft; 2093 final int ct = child.mTop; 2094 final int cr = child.mRight; 2095 final int cb = child.mBottom; 2096 2097 final int flags = mGroupFlags; 2098 2099 if ((flags & FLAG_CLEAR_TRANSFORMATION) == FLAG_CLEAR_TRANSFORMATION) { 2100 mChildTransformation.clear(); 2101 mGroupFlags &= ~FLAG_CLEAR_TRANSFORMATION; 2102 } 2103 2104 Transformation transformToApply = null; 2105 Transformation invalidationTransform; 2106 final Animation a = child.getAnimation(); 2107 boolean concatMatrix = false; 2108 2109 boolean scalingRequired = false; 2110 boolean caching = false; 2111 if ((flags & FLAG_CHILDREN_DRAWN_WITH_CACHE) == FLAG_CHILDREN_DRAWN_WITH_CACHE || 2112 (flags & FLAG_ALWAYS_DRAWN_WITH_CACHE) == FLAG_ALWAYS_DRAWN_WITH_CACHE) { 2113 caching = true; 2114 if (mAttachInfo != null) scalingRequired = mAttachInfo.mScalingRequired; 2115 } 2116 2117 if (a != null) { 2118 final boolean initialized = a.isInitialized(); 2119 if (!initialized) { 2120 a.initialize(cr - cl, cb - ct, getWidth(), getHeight()); 2121 a.initializeInvalidateRegion(0, 0, cr - cl, cb - ct); 2122 child.onAnimationStart(); 2123 } 2124 2125 more = a.getTransformation(drawingTime, mChildTransformation, 2126 scalingRequired ? mAttachInfo.mApplicationScale : 1f); 2127 if (scalingRequired && mAttachInfo.mApplicationScale != 1f) { 2128 if (mInvalidationTransformation == null) { 2129 mInvalidationTransformation = new Transformation(); 2130 } 2131 invalidationTransform = mInvalidationTransformation; 2132 a.getTransformation(drawingTime, invalidationTransform, 1f); 2133 } else { 2134 invalidationTransform = mChildTransformation; 2135 } 2136 transformToApply = mChildTransformation; 2137 2138 concatMatrix = a.willChangeTransformationMatrix(); 2139 2140 if (more) { 2141 if (!a.willChangeBounds()) { 2142 if ((flags & (FLAG_OPTIMIZE_INVALIDATE | FLAG_ANIMATION_DONE)) == 2143 FLAG_OPTIMIZE_INVALIDATE) { 2144 mGroupFlags |= FLAG_INVALIDATE_REQUIRED; 2145 } else if ((flags & FLAG_INVALIDATE_REQUIRED) == 0) { 2146 // The child need to draw an animation, potentially offscreen, so 2147 // make sure we do not cancel invalidate requests 2148 mPrivateFlags |= DRAW_ANIMATION; 2149 invalidate(cl, ct, cr, cb); 2150 } 2151 } else { 2152 if (mInvalidateRegion == null) { 2153 mInvalidateRegion = new RectF(); 2154 } 2155 final RectF region = mInvalidateRegion; 2156 a.getInvalidateRegion(0, 0, cr - cl, cb - ct, region, invalidationTransform); 2157 2158 // The child need to draw an animation, potentially offscreen, so 2159 // make sure we do not cancel invalidate requests 2160 mPrivateFlags |= DRAW_ANIMATION; 2161 2162 final int left = cl + (int) region.left; 2163 final int top = ct + (int) region.top; 2164 invalidate(left, top, left + (int) region.width(), top + (int) region.height()); 2165 } 2166 } 2167 } else if ((flags & FLAG_SUPPORT_STATIC_TRANSFORMATIONS) == 2168 FLAG_SUPPORT_STATIC_TRANSFORMATIONS) { 2169 final boolean hasTransform = getChildStaticTransformation(child, mChildTransformation); 2170 if (hasTransform) { 2171 final int transformType = mChildTransformation.getTransformationType(); 2172 transformToApply = transformType != Transformation.TYPE_IDENTITY ? 2173 mChildTransformation : null; 2174 concatMatrix = (transformType & Transformation.TYPE_MATRIX) != 0; 2175 } 2176 } 2177 2178 concatMatrix |= !child.hasIdentityMatrix(); 2179 2180 // Sets the flag as early as possible to allow draw() implementations 2181 // to call invalidate() successfully when doing animations 2182 child.mPrivateFlags |= DRAWN; 2183 2184 if (!concatMatrix && canvas.quickReject(cl, ct, cr, cb, Canvas.EdgeType.BW) && 2185 (child.mPrivateFlags & DRAW_ANIMATION) == 0) { 2186 return more; 2187 } 2188 2189 child.computeScroll(); 2190 2191 final int sx = child.mScrollX; 2192 final int sy = child.mScrollY; 2193 2194 DisplayList displayList = null; 2195 Bitmap cache = null; 2196 if (caching) { 2197 if (!canvas.isHardwareAccelerated()) { 2198 cache = child.getDrawingCache(true); 2199 } else { 2200 // TODO: bring back 2201 // displayList = child.getDisplayList(); 2202 } 2203 } 2204 2205 final boolean hasDisplayList = displayList != null && displayList.isReady(); 2206 final boolean hasNoCache = cache == null || hasDisplayList; 2207 2208 final int restoreTo = canvas.save(); 2209 if (hasNoCache) { 2210 canvas.translate(cl - sx, ct - sy); 2211 } else { 2212 canvas.translate(cl, ct); 2213 if (scalingRequired) { 2214 // mAttachInfo cannot be null, otherwise scalingRequired == false 2215 final float scale = 1.0f / mAttachInfo.mApplicationScale; 2216 canvas.scale(scale, scale); 2217 } 2218 } 2219 2220 float alpha = child.getAlpha(); 2221 2222 if (transformToApply != null || alpha < 1.0f || !child.hasIdentityMatrix()) { 2223 int transX = 0; 2224 int transY = 0; 2225 2226 if (hasNoCache) { 2227 transX = -sx; 2228 transY = -sy; 2229 } 2230 2231 if (transformToApply != null) { 2232 if (concatMatrix) { 2233 // Undo the scroll translation, apply the transformation matrix, 2234 // then redo the scroll translate to get the correct result. 2235 canvas.translate(-transX, -transY); 2236 canvas.concat(transformToApply.getMatrix()); 2237 canvas.translate(transX, transY); 2238 mGroupFlags |= FLAG_CLEAR_TRANSFORMATION; 2239 } 2240 2241 float transformAlpha = transformToApply.getAlpha(); 2242 if (transformAlpha < 1.0f) { 2243 alpha *= transformToApply.getAlpha(); 2244 mGroupFlags |= FLAG_CLEAR_TRANSFORMATION; 2245 } 2246 } 2247 2248 if (!child.hasIdentityMatrix()) { 2249 canvas.translate(-transX, -transY); 2250 canvas.concat(child.getMatrix()); 2251 canvas.translate(transX, transY); 2252 } 2253 2254 if (alpha < 1.0f) { 2255 mGroupFlags |= FLAG_CLEAR_TRANSFORMATION; 2256 2257 if (hasNoCache) { 2258 final int multipliedAlpha = (int) (255 * alpha); 2259 if (!child.onSetAlpha(multipliedAlpha)) { 2260 int layerFlags = Canvas.HAS_ALPHA_LAYER_SAVE_FLAG; 2261 if ((flags & FLAG_CLIP_CHILDREN) == FLAG_CLIP_CHILDREN) { 2262 layerFlags |= Canvas.CLIP_TO_LAYER_SAVE_FLAG; 2263 } 2264 canvas.saveLayerAlpha(sx, sy, sx + cr - cl, sy + cb - ct, multipliedAlpha, 2265 layerFlags); 2266 } else { 2267 child.mPrivateFlags |= ALPHA_SET; 2268 } 2269 } 2270 } 2271 } else if ((child.mPrivateFlags & ALPHA_SET) == ALPHA_SET) { 2272 child.onSetAlpha(255); 2273 child.mPrivateFlags &= ~ALPHA_SET; 2274 } 2275 2276 if ((flags & FLAG_CLIP_CHILDREN) == FLAG_CLIP_CHILDREN) { 2277 if (hasNoCache) { 2278 canvas.clipRect(sx, sy, sx + (cr - cl), sy + (cb - ct)); 2279 } else { 2280 if (!scalingRequired) { 2281 canvas.clipRect(0, 0, cr - cl, cb - ct); 2282 } else { 2283 canvas.clipRect(0, 0, cache.getWidth(), cache.getHeight()); 2284 } 2285 } 2286 } 2287 2288 if (hasNoCache) { 2289 if (!hasDisplayList) { 2290 // Fast path for layouts with no backgrounds 2291 if ((child.mPrivateFlags & SKIP_DRAW) == SKIP_DRAW) { 2292 if (ViewDebug.TRACE_HIERARCHY) { 2293 ViewDebug.trace(this, ViewDebug.HierarchyTraceType.DRAW); 2294 } 2295 child.mPrivateFlags &= ~DIRTY_MASK; 2296 child.dispatchDraw(canvas); 2297 } else { 2298 child.draw(canvas); 2299 } 2300 } else { 2301 ((HardwareCanvas) canvas).drawDisplayList(displayList); 2302 } 2303 } else if (cache != null) { 2304 final Paint cachePaint = mCachePaint; 2305 if (alpha < 1.0f) { 2306 cachePaint.setAlpha((int) (alpha * 255)); 2307 mGroupFlags |= FLAG_ALPHA_LOWER_THAN_ONE; 2308 } else if ((flags & FLAG_ALPHA_LOWER_THAN_ONE) == FLAG_ALPHA_LOWER_THAN_ONE) { 2309 cachePaint.setAlpha(255); 2310 mGroupFlags &= ~FLAG_ALPHA_LOWER_THAN_ONE; 2311 } 2312 canvas.drawBitmap(cache, 0.0f, 0.0f, cachePaint); 2313 } 2314 2315 canvas.restoreToCount(restoreTo); 2316 2317 if (a != null && !more) { 2318 child.onSetAlpha(255); 2319 finishAnimatingView(child, a); 2320 } 2321 2322 return more; 2323 } 2324 2325 /** 2326 * By default, children are clipped to their bounds before drawing. This 2327 * allows view groups to override this behavior for animations, etc. 2328 * 2329 * @param clipChildren true to clip children to their bounds, 2330 * false otherwise 2331 * @attr ref android.R.styleable#ViewGroup_clipChildren 2332 */ 2333 public void setClipChildren(boolean clipChildren) { 2334 setBooleanFlag(FLAG_CLIP_CHILDREN, clipChildren); 2335 } 2336 2337 /** 2338 * By default, children are clipped to the padding of the ViewGroup. This 2339 * allows view groups to override this behavior 2340 * 2341 * @param clipToPadding true to clip children to the padding of the 2342 * group, false otherwise 2343 * @attr ref android.R.styleable#ViewGroup_clipToPadding 2344 */ 2345 public void setClipToPadding(boolean clipToPadding) { 2346 setBooleanFlag(FLAG_CLIP_TO_PADDING, clipToPadding); 2347 } 2348 2349 /** 2350 * {@inheritDoc} 2351 */ 2352 @Override 2353 public void dispatchSetSelected(boolean selected) { 2354 final View[] children = mChildren; 2355 final int count = mChildrenCount; 2356 for (int i = 0; i < count; i++) { 2357 2358 children[i].setSelected(selected); 2359 } 2360 } 2361 2362 /** 2363 * {@inheritDoc} 2364 */ 2365 @Override 2366 public void dispatchSetActivated(boolean activated) { 2367 final View[] children = mChildren; 2368 final int count = mChildrenCount; 2369 for (int i = 0; i < count; i++) { 2370 2371 children[i].setActivated(activated); 2372 } 2373 } 2374 2375 @Override 2376 protected void dispatchSetPressed(boolean pressed) { 2377 final View[] children = mChildren; 2378 final int count = mChildrenCount; 2379 for (int i = 0; i < count; i++) { 2380 children[i].setPressed(pressed); 2381 } 2382 } 2383 2384 /** 2385 * When this property is set to true, this ViewGroup supports static transformations on 2386 * children; this causes 2387 * {@link #getChildStaticTransformation(View, android.view.animation.Transformation)} to be 2388 * invoked when a child is drawn. 2389 * 2390 * Any subclass overriding 2391 * {@link #getChildStaticTransformation(View, android.view.animation.Transformation)} should 2392 * set this property to true. 2393 * 2394 * @param enabled True to enable static transformations on children, false otherwise. 2395 * 2396 * @see #FLAG_SUPPORT_STATIC_TRANSFORMATIONS 2397 */ 2398 protected void setStaticTransformationsEnabled(boolean enabled) { 2399 setBooleanFlag(FLAG_SUPPORT_STATIC_TRANSFORMATIONS, enabled); 2400 } 2401 2402 /** 2403 * {@inheritDoc} 2404 * 2405 * @see #setStaticTransformationsEnabled(boolean) 2406 */ 2407 protected boolean getChildStaticTransformation(View child, Transformation t) { 2408 return false; 2409 } 2410 2411 /** 2412 * {@hide} 2413 */ 2414 @Override 2415 protected View findViewTraversal(int id) { 2416 if (id == mID) { 2417 return this; 2418 } 2419 2420 final View[] where = mChildren; 2421 final int len = mChildrenCount; 2422 2423 for (int i = 0; i < len; i++) { 2424 View v = where[i]; 2425 2426 if ((v.mPrivateFlags & IS_ROOT_NAMESPACE) == 0) { 2427 v = v.findViewById(id); 2428 2429 if (v != null) { 2430 return v; 2431 } 2432 } 2433 } 2434 2435 return null; 2436 } 2437 2438 /** 2439 * {@hide} 2440 */ 2441 @Override 2442 protected View findViewWithTagTraversal(Object tag) { 2443 if (tag != null && tag.equals(mTag)) { 2444 return this; 2445 } 2446 2447 final View[] where = mChildren; 2448 final int len = mChildrenCount; 2449 2450 for (int i = 0; i < len; i++) { 2451 View v = where[i]; 2452 2453 if ((v.mPrivateFlags & IS_ROOT_NAMESPACE) == 0) { 2454 v = v.findViewWithTag(tag); 2455 2456 if (v != null) { 2457 return v; 2458 } 2459 } 2460 } 2461 2462 return null; 2463 } 2464 2465 /** 2466 * Adds a child view. If no layout parameters are already set on the child, the 2467 * default parameters for this ViewGroup are set on the child. 2468 * 2469 * @param child the child view to add 2470 * 2471 * @see #generateDefaultLayoutParams() 2472 */ 2473 public void addView(View child) { 2474 addView(child, -1); 2475 } 2476 2477 /** 2478 * Adds a child view. If no layout parameters are already set on the child, the 2479 * default parameters for this ViewGroup are set on the child. 2480 * 2481 * @param child the child view to add 2482 * @param index the position at which to add the child 2483 * 2484 * @see #generateDefaultLayoutParams() 2485 */ 2486 public void addView(View child, int index) { 2487 LayoutParams params = child.getLayoutParams(); 2488 if (params == null) { 2489 params = generateDefaultLayoutParams(); 2490 if (params == null) { 2491 throw new IllegalArgumentException("generateDefaultLayoutParams() cannot return null"); 2492 } 2493 } 2494 addView(child, index, params); 2495 } 2496 2497 /** 2498 * Adds a child view with this ViewGroup's default layout parameters and the 2499 * specified width and height. 2500 * 2501 * @param child the child view to add 2502 */ 2503 public void addView(View child, int width, int height) { 2504 final LayoutParams params = generateDefaultLayoutParams(); 2505 params.width = width; 2506 params.height = height; 2507 addView(child, -1, params); 2508 } 2509 2510 /** 2511 * Adds a child view with the specified layout parameters. 2512 * 2513 * @param child the child view to add 2514 * @param params the layout parameters to set on the child 2515 */ 2516 public void addView(View child, LayoutParams params) { 2517 addView(child, -1, params); 2518 } 2519 2520 /** 2521 * Adds a child view with the specified layout parameters. 2522 * 2523 * @param child the child view to add 2524 * @param index the position at which to add the child 2525 * @param params the layout parameters to set on the child 2526 */ 2527 public void addView(View child, int index, LayoutParams params) { 2528 if (DBG) { 2529 System.out.println(this + " addView"); 2530 } 2531 2532 // addViewInner() will call child.requestLayout() when setting the new LayoutParams 2533 // therefore, we call requestLayout() on ourselves before, so that the child's request 2534 // will be blocked at our level 2535 requestLayout(); 2536 invalidate(); 2537 addViewInner(child, index, params, false); 2538 } 2539 2540 /** 2541 * {@inheritDoc} 2542 */ 2543 public void updateViewLayout(View view, ViewGroup.LayoutParams params) { 2544 if (!checkLayoutParams(params)) { 2545 throw new IllegalArgumentException("Invalid LayoutParams supplied to " + this); 2546 } 2547 if (view.mParent != this) { 2548 throw new IllegalArgumentException("Given view not a child of " + this); 2549 } 2550 view.setLayoutParams(params); 2551 } 2552 2553 /** 2554 * {@inheritDoc} 2555 */ 2556 protected boolean checkLayoutParams(ViewGroup.LayoutParams p) { 2557 return p != null; 2558 } 2559 2560 /** 2561 * Interface definition for a callback to be invoked when the hierarchy 2562 * within this view changed. The hierarchy changes whenever a child is added 2563 * to or removed from this view. 2564 */ 2565 public interface OnHierarchyChangeListener { 2566 /** 2567 * Called when a new child is added to a parent view. 2568 * 2569 * @param parent the view in which a child was added 2570 * @param child the new child view added in the hierarchy 2571 */ 2572 void onChildViewAdded(View parent, View child); 2573 2574 /** 2575 * Called when a child is removed from a parent view. 2576 * 2577 * @param parent the view from which the child was removed 2578 * @param child the child removed from the hierarchy 2579 */ 2580 void onChildViewRemoved(View parent, View child); 2581 } 2582 2583 /** 2584 * Register a callback to be invoked when a child is added to or removed 2585 * from this view. 2586 * 2587 * @param listener the callback to invoke on hierarchy change 2588 */ 2589 public void setOnHierarchyChangeListener(OnHierarchyChangeListener listener) { 2590 mOnHierarchyChangeListener = listener; 2591 } 2592 2593 /** 2594 * Adds a view during layout. This is useful if in your onLayout() method, 2595 * you need to add more views (as does the list view for example). 2596 * 2597 * If index is negative, it means put it at the end of the list. 2598 * 2599 * @param child the view to add to the group 2600 * @param index the index at which the child must be added 2601 * @param params the layout parameters to associate with the child 2602 * @return true if the child was added, false otherwise 2603 */ 2604 protected boolean addViewInLayout(View child, int index, LayoutParams params) { 2605 return addViewInLayout(child, index, params, false); 2606 } 2607 2608 /** 2609 * Adds a view during layout. This is useful if in your onLayout() method, 2610 * you need to add more views (as does the list view for example). 2611 * 2612 * If index is negative, it means put it at the end of the list. 2613 * 2614 * @param child the view to add to the group 2615 * @param index the index at which the child must be added 2616 * @param params the layout parameters to associate with the child 2617 * @param preventRequestLayout if true, calling this method will not trigger a 2618 * layout request on child 2619 * @return true if the child was added, false otherwise 2620 */ 2621 protected boolean addViewInLayout(View child, int index, LayoutParams params, 2622 boolean preventRequestLayout) { 2623 child.mParent = null; 2624 addViewInner(child, index, params, preventRequestLayout); 2625 child.mPrivateFlags = (child.mPrivateFlags & ~DIRTY_MASK) | DRAWN; 2626 return true; 2627 } 2628 2629 /** 2630 * Prevents the specified child to be laid out during the next layout pass. 2631 * 2632 * @param child the child on which to perform the cleanup 2633 */ 2634 protected void cleanupLayoutState(View child) { 2635 child.mPrivateFlags &= ~View.FORCE_LAYOUT; 2636 } 2637 2638 private void addViewInner(View child, int index, LayoutParams params, 2639 boolean preventRequestLayout) { 2640 2641 if (child.getParent() != null) { 2642 throw new IllegalStateException("The specified child already has a parent. " + 2643 "You must call removeView() on the child's parent first."); 2644 } 2645 2646 if (mTransition != null) { 2647 mTransition.addChild(this, child); 2648 } 2649 2650 if (!checkLayoutParams(params)) { 2651 params = generateLayoutParams(params); 2652 } 2653 2654 if (preventRequestLayout) { 2655 child.mLayoutParams = params; 2656 } else { 2657 child.setLayoutParams(params); 2658 } 2659 2660 if (index < 0) { 2661 index = mChildrenCount; 2662 } 2663 2664 addInArray(child, index); 2665 2666 // tell our children 2667 if (preventRequestLayout) { 2668 child.assignParent(this); 2669 } else { 2670 child.mParent = this; 2671 } 2672 2673 if (child.hasFocus()) { 2674 requestChildFocus(child, child.findFocus()); 2675 } 2676 2677 AttachInfo ai = mAttachInfo; 2678 if (ai != null) { 2679 boolean lastKeepOn = ai.mKeepScreenOn; 2680 ai.mKeepScreenOn = false; 2681 child.dispatchAttachedToWindow(mAttachInfo, (mViewFlags&VISIBILITY_MASK)); 2682 if (ai.mKeepScreenOn) { 2683 needGlobalAttributesUpdate(true); 2684 } 2685 ai.mKeepScreenOn = lastKeepOn; 2686 } 2687 2688 if (mOnHierarchyChangeListener != null) { 2689 mOnHierarchyChangeListener.onChildViewAdded(this, child); 2690 } 2691 2692 if ((child.mViewFlags & DUPLICATE_PARENT_STATE) == DUPLICATE_PARENT_STATE) { 2693 mGroupFlags |= FLAG_NOTIFY_CHILDREN_ON_DRAWABLE_STATE_CHANGE; 2694 } 2695 } 2696 2697 private void addInArray(View child, int index) { 2698 View[] children = mChildren; 2699 final int count = mChildrenCount; 2700 final int size = children.length; 2701 if (index == count) { 2702 if (size == count) { 2703 mChildren = new View[size + ARRAY_CAPACITY_INCREMENT]; 2704 System.arraycopy(children, 0, mChildren, 0, size); 2705 children = mChildren; 2706 } 2707 children[mChildrenCount++] = child; 2708 } else if (index < count) { 2709 if (size == count) { 2710 mChildren = new View[size + ARRAY_CAPACITY_INCREMENT]; 2711 System.arraycopy(children, 0, mChildren, 0, index); 2712 System.arraycopy(children, index, mChildren, index + 1, count - index); 2713 children = mChildren; 2714 } else { 2715 System.arraycopy(children, index, children, index + 1, count - index); 2716 } 2717 children[index] = child; 2718 mChildrenCount++; 2719 } else { 2720 throw new IndexOutOfBoundsException("index=" + index + " count=" + count); 2721 } 2722 } 2723 2724 // This method also sets the child's mParent to null 2725 private void removeFromArray(int index) { 2726 final View[] children = mChildren; 2727 if (!(mTransitioningViews != null && mTransitioningViews.contains(children[index]))) { 2728 children[index].mParent = null; 2729 } 2730 final int count = mChildrenCount; 2731 if (index == count - 1) { 2732 children[--mChildrenCount] = null; 2733 } else if (index >= 0 && index < count) { 2734 System.arraycopy(children, index + 1, children, index, count - index - 1); 2735 children[--mChildrenCount] = null; 2736 } else { 2737 throw new IndexOutOfBoundsException(); 2738 } 2739 } 2740 2741 // This method also sets the children's mParent to null 2742 private void removeFromArray(int start, int count) { 2743 final View[] children = mChildren; 2744 final int childrenCount = mChildrenCount; 2745 2746 start = Math.max(0, start); 2747 final int end = Math.min(childrenCount, start + count); 2748 2749 if (start == end) { 2750 return; 2751 } 2752 2753 if (end == childrenCount) { 2754 for (int i = start; i < end; i++) { 2755 children[i].mParent = null; 2756 children[i] = null; 2757 } 2758 } else { 2759 for (int i = start; i < end; i++) { 2760 children[i].mParent = null; 2761 } 2762 2763 // Since we're looping above, we might as well do the copy, but is arraycopy() 2764 // faster than the extra 2 bounds checks we would do in the loop? 2765 System.arraycopy(children, end, children, start, childrenCount - end); 2766 2767 for (int i = childrenCount - (end - start); i < childrenCount; i++) { 2768 children[i] = null; 2769 } 2770 } 2771 2772 mChildrenCount -= (end - start); 2773 } 2774 2775 private void bindLayoutAnimation(View child) { 2776 Animation a = mLayoutAnimationController.getAnimationForView(child); 2777 child.setAnimation(a); 2778 } 2779 2780 /** 2781 * Subclasses should override this method to set layout animation 2782 * parameters on the supplied child. 2783 * 2784 * @param child the child to associate with animation parameters 2785 * @param params the child's layout parameters which hold the animation 2786 * parameters 2787 * @param index the index of the child in the view group 2788 * @param count the number of children in the view group 2789 */ 2790 protected void attachLayoutAnimationParameters(View child, 2791 LayoutParams params, int index, int count) { 2792 LayoutAnimationController.AnimationParameters animationParams = 2793 params.layoutAnimationParameters; 2794 if (animationParams == null) { 2795 animationParams = new LayoutAnimationController.AnimationParameters(); 2796 params.layoutAnimationParameters = animationParams; 2797 } 2798 2799 animationParams.count = count; 2800 animationParams.index = index; 2801 } 2802 2803 /** 2804 * {@inheritDoc} 2805 */ 2806 public void removeView(View view) { 2807 removeViewInternal(view); 2808 requestLayout(); 2809 invalidate(); 2810 } 2811 2812 /** 2813 * Removes a view during layout. This is useful if in your onLayout() method, 2814 * you need to remove more views. 2815 * 2816 * @param view the view to remove from the group 2817 */ 2818 public void removeViewInLayout(View view) { 2819 removeViewInternal(view); 2820 } 2821 2822 /** 2823 * Removes a range of views during layout. This is useful if in your onLayout() method, 2824 * you need to remove more views. 2825 * 2826 * @param start the index of the first view to remove from the group 2827 * @param count the number of views to remove from the group 2828 */ 2829 public void removeViewsInLayout(int start, int count) { 2830 removeViewsInternal(start, count); 2831 } 2832 2833 /** 2834 * Removes the view at the specified position in the group. 2835 * 2836 * @param index the position in the group of the view to remove 2837 */ 2838 public void removeViewAt(int index) { 2839 removeViewInternal(index, getChildAt(index)); 2840 requestLayout(); 2841 invalidate(); 2842 } 2843 2844 /** 2845 * Removes the specified range of views from the group. 2846 * 2847 * @param start the first position in the group of the range of views to remove 2848 * @param count the number of views to remove 2849 */ 2850 public void removeViews(int start, int count) { 2851 removeViewsInternal(start, count); 2852 requestLayout(); 2853 invalidate(); 2854 } 2855 2856 private void removeViewInternal(View view) { 2857 final int index = indexOfChild(view); 2858 if (index >= 0) { 2859 removeViewInternal(index, view); 2860 } 2861 } 2862 2863 private void removeViewInternal(int index, View view) { 2864 2865 if (mTransition != null) { 2866 mTransition.removeChild(this, view); 2867 } 2868 2869 boolean clearChildFocus = false; 2870 if (view == mFocused) { 2871 view.clearFocusForRemoval(); 2872 clearChildFocus = true; 2873 } 2874 2875 if (view.getAnimation() != null || 2876 (mTransitioningViews != null && mTransitioningViews.contains(view))) { 2877 addDisappearingView(view); 2878 } else if (view.mAttachInfo != null) { 2879 view.dispatchDetachedFromWindow(); 2880 } 2881 2882 if (mOnHierarchyChangeListener != null) { 2883 mOnHierarchyChangeListener.onChildViewRemoved(this, view); 2884 } 2885 2886 needGlobalAttributesUpdate(false); 2887 2888 removeFromArray(index); 2889 2890 if (clearChildFocus) { 2891 clearChildFocus(view); 2892 } 2893 } 2894 2895 /** 2896 * Sets the LayoutTransition object for this ViewGroup. If the LayoutTransition object is 2897 * not null, changes in layout which occur because of children being added to or removed from 2898 * the ViewGroup will be animated according to the animations defined in that LayoutTransition 2899 * object. By default, the transition object is null (so layout changes are not animated). 2900 * 2901 * @param transition The LayoutTransition object that will animated changes in layout. A value 2902 * of <code>null</code> means no transition will run on layout changes. 2903 * @attr ref android.R.styleable#ViewGroup_animateLayoutChanges 2904 */ 2905 public void setLayoutTransition(LayoutTransition transition) { 2906 if (mTransition != null) { 2907 mTransition.removeTransitionListener(mLayoutTransitionListener); 2908 } 2909 mTransition = transition; 2910 if (mTransition != null) { 2911 mTransition.addTransitionListener(mLayoutTransitionListener); 2912 } 2913 } 2914 2915 /** 2916 * Gets the LayoutTransition object for this ViewGroup. If the LayoutTransition object is 2917 * not null, changes in layout which occur because of children being added to or removed from 2918 * the ViewGroup will be animated according to the animations defined in that LayoutTransition 2919 * object. By default, the transition object is null (so layout changes are not animated). 2920 * 2921 * @return LayoutTranstion The LayoutTransition object that will animated changes in layout. 2922 * A value of <code>null</code> means no transition will run on layout changes. 2923 */ 2924 public LayoutTransition getLayoutTransition() { 2925 return mTransition; 2926 } 2927 2928 private void removeViewsInternal(int start, int count) { 2929 final OnHierarchyChangeListener onHierarchyChangeListener = mOnHierarchyChangeListener; 2930 final boolean notifyListener = onHierarchyChangeListener != null; 2931 final View focused = mFocused; 2932 final boolean detach = mAttachInfo != null; 2933 View clearChildFocus = null; 2934 2935 final View[] children = mChildren; 2936 final int end = start + count; 2937 2938 for (int i = start; i < end; i++) { 2939 final View view = children[i]; 2940 2941 if (mTransition != null) { 2942 mTransition.removeChild(this, view); 2943 } 2944 2945 if (view == focused) { 2946 view.clearFocusForRemoval(); 2947 clearChildFocus = view; 2948 } 2949 2950 if (view.getAnimation() != null || 2951 (mTransitioningViews != null && mTransitioningViews.contains(view))) { 2952 addDisappearingView(view); 2953 } else if (detach) { 2954 view.dispatchDetachedFromWindow(); 2955 } 2956 2957 needGlobalAttributesUpdate(false); 2958 2959 if (notifyListener) { 2960 onHierarchyChangeListener.onChildViewRemoved(this, view); 2961 } 2962 } 2963 2964 removeFromArray(start, count); 2965 2966 if (clearChildFocus != null) { 2967 clearChildFocus(clearChildFocus); 2968 } 2969 } 2970 2971 /** 2972 * Call this method to remove all child views from the 2973 * ViewGroup. 2974 */ 2975 public void removeAllViews() { 2976 removeAllViewsInLayout(); 2977 requestLayout(); 2978 invalidate(); 2979 } 2980 2981 /** 2982 * Called by a ViewGroup subclass to remove child views from itself, 2983 * when it must first know its size on screen before it can calculate how many 2984 * child views it will render. An example is a Gallery or a ListView, which 2985 * may "have" 50 children, but actually only render the number of children 2986 * that can currently fit inside the object on screen. Do not call 2987 * this method unless you are extending ViewGroup and understand the 2988 * view measuring and layout pipeline. 2989 */ 2990 public void removeAllViewsInLayout() { 2991 final int count = mChildrenCount; 2992 if (count <= 0) { 2993 return; 2994 } 2995 2996 final View[] children = mChildren; 2997 mChildrenCount = 0; 2998 2999 final OnHierarchyChangeListener listener = mOnHierarchyChangeListener; 3000 final boolean notify = listener != null; 3001 final View focused = mFocused; 3002 final boolean detach = mAttachInfo != null; 3003 View clearChildFocus = null; 3004 3005 needGlobalAttributesUpdate(false); 3006 3007 for (int i = count - 1; i >= 0; i--) { 3008 final View view = children[i]; 3009 3010 if (mTransition != null) { 3011 mTransition.removeChild(this, view); 3012 } 3013 3014 if (view == focused) { 3015 view.clearFocusForRemoval(); 3016 clearChildFocus = view; 3017 } 3018 3019 if (view.getAnimation() != null || 3020 (mTransitioningViews != null && mTransitioningViews.contains(view))) { 3021 addDisappearingView(view); 3022 } else if (detach) { 3023 view.dispatchDetachedFromWindow(); 3024 } 3025 3026 if (notify) { 3027 listener.onChildViewRemoved(this, view); 3028 } 3029 3030 view.mParent = null; 3031 children[i] = null; 3032 } 3033 3034 if (clearChildFocus != null) { 3035 clearChildFocus(clearChildFocus); 3036 } 3037 } 3038 3039 /** 3040 * Finishes the removal of a detached view. This method will dispatch the detached from 3041 * window event and notify the hierarchy change listener. 3042 * 3043 * @param child the child to be definitely removed from the view hierarchy 3044 * @param animate if true and the view has an animation, the view is placed in the 3045 * disappearing views list, otherwise, it is detached from the window 3046 * 3047 * @see #attachViewToParent(View, int, android.view.ViewGroup.LayoutParams) 3048 * @see #detachAllViewsFromParent() 3049 * @see #detachViewFromParent(View) 3050 * @see #detachViewFromParent(int) 3051 */ 3052 protected void removeDetachedView(View child, boolean animate) { 3053 if (mTransition != null) { 3054 mTransition.removeChild(this, child); 3055 } 3056 3057 if (child == mFocused) { 3058 child.clearFocus(); 3059 } 3060 3061 if ((animate && child.getAnimation() != null) || 3062 (mTransitioningViews != null && mTransitioningViews.contains(child))) { 3063 addDisappearingView(child); 3064 } else if (child.mAttachInfo != null) { 3065 child.dispatchDetachedFromWindow(); 3066 } 3067 3068 if (mOnHierarchyChangeListener != null) { 3069 mOnHierarchyChangeListener.onChildViewRemoved(this, child); 3070 } 3071 } 3072 3073 /** 3074 * Attaches a view to this view group. Attaching a view assigns this group as the parent, 3075 * sets the layout parameters and puts the view in the list of children so it can be retrieved 3076 * by calling {@link #getChildAt(int)}. 3077 * 3078 * This method should be called only for view which were detached from their parent. 3079 * 3080 * @param child the child to attach 3081 * @param index the index at which the child should be attached 3082 * @param params the layout parameters of the child 3083 * 3084 * @see #removeDetachedView(View, boolean) 3085 * @see #detachAllViewsFromParent() 3086 * @see #detachViewFromParent(View) 3087 * @see #detachViewFromParent(int) 3088 */ 3089 protected void attachViewToParent(View child, int index, LayoutParams params) { 3090 child.mLayoutParams = params; 3091 3092 if (index < 0) { 3093 index = mChildrenCount; 3094 } 3095 3096 addInArray(child, index); 3097 3098 child.mParent = this; 3099 child.mPrivateFlags = (child.mPrivateFlags & ~DIRTY_MASK & ~DRAWING_CACHE_VALID) | DRAWN; 3100 3101 if (child.hasFocus()) { 3102 requestChildFocus(child, child.findFocus()); 3103 } 3104 } 3105 3106 /** 3107 * Detaches a view from its parent. Detaching a view should be temporary and followed 3108 * either by a call to {@link #attachViewToParent(View, int, android.view.ViewGroup.LayoutParams)} 3109 * or a call to {@link #removeDetachedView(View, boolean)}. When a view is detached, 3110 * its parent is null and cannot be retrieved by a call to {@link #getChildAt(int)}. 3111 * 3112 * @param child the child to detach 3113 * 3114 * @see #detachViewFromParent(int) 3115 * @see #detachViewsFromParent(int, int) 3116 * @see #detachAllViewsFromParent() 3117 * @see #attachViewToParent(View, int, android.view.ViewGroup.LayoutParams) 3118 * @see #removeDetachedView(View, boolean) 3119 */ 3120 protected void detachViewFromParent(View child) { 3121 removeFromArray(indexOfChild(child)); 3122 } 3123 3124 /** 3125 * Detaches a view from its parent. Detaching a view should be temporary and followed 3126 * either by a call to {@link #attachViewToParent(View, int, android.view.ViewGroup.LayoutParams)} 3127 * or a call to {@link #removeDetachedView(View, boolean)}. When a view is detached, 3128 * its parent is null and cannot be retrieved by a call to {@link #getChildAt(int)}. 3129 * 3130 * @param index the index of the child to detach 3131 * 3132 * @see #detachViewFromParent(View) 3133 * @see #detachAllViewsFromParent() 3134 * @see #detachViewsFromParent(int, int) 3135 * @see #attachViewToParent(View, int, android.view.ViewGroup.LayoutParams) 3136 * @see #removeDetachedView(View, boolean) 3137 */ 3138 protected void detachViewFromParent(int index) { 3139 removeFromArray(index); 3140 } 3141 3142 /** 3143 * Detaches a range of view from their parent. Detaching a view should be temporary and followed 3144 * either by a call to {@link #attachViewToParent(View, int, android.view.ViewGroup.LayoutParams)} 3145 * or a call to {@link #removeDetachedView(View, boolean)}. When a view is detached, its 3146 * parent is null and cannot be retrieved by a call to {@link #getChildAt(int)}. 3147 * 3148 * @param start the first index of the childrend range to detach 3149 * @param count the number of children to detach 3150 * 3151 * @see #detachViewFromParent(View) 3152 * @see #detachViewFromParent(int) 3153 * @see #detachAllViewsFromParent() 3154 * @see #attachViewToParent(View, int, android.view.ViewGroup.LayoutParams) 3155 * @see #removeDetachedView(View, boolean) 3156 */ 3157 protected void detachViewsFromParent(int start, int count) { 3158 removeFromArray(start, count); 3159 } 3160 3161 /** 3162 * Detaches all views from the parent. Detaching a view should be temporary and followed 3163 * either by a call to {@link #attachViewToParent(View, int, android.view.ViewGroup.LayoutParams)} 3164 * or a call to {@link #removeDetachedView(View, boolean)}. When a view is detached, 3165 * its parent is null and cannot be retrieved by a call to {@link #getChildAt(int)}. 3166 * 3167 * @see #detachViewFromParent(View) 3168 * @see #detachViewFromParent(int) 3169 * @see #detachViewsFromParent(int, int) 3170 * @see #attachViewToParent(View, int, android.view.ViewGroup.LayoutParams) 3171 * @see #removeDetachedView(View, boolean) 3172 */ 3173 protected void detachAllViewsFromParent() { 3174 final int count = mChildrenCount; 3175 if (count <= 0) { 3176 return; 3177 } 3178 3179 final View[] children = mChildren; 3180 mChildrenCount = 0; 3181 3182 for (int i = count - 1; i >= 0; i--) { 3183 children[i].mParent = null; 3184 children[i] = null; 3185 } 3186 } 3187 3188 /** 3189 * Don't call or override this method. It is used for the implementation of 3190 * the view hierarchy. 3191 */ 3192 public final void invalidateChild(View child, final Rect dirty) { 3193 if (ViewDebug.TRACE_HIERARCHY) { 3194 ViewDebug.trace(this, ViewDebug.HierarchyTraceType.INVALIDATE_CHILD); 3195 } 3196 3197 ViewParent parent = this; 3198 3199 final AttachInfo attachInfo = mAttachInfo; 3200 if (attachInfo != null) { 3201 final int[] location = attachInfo.mInvalidateChildLocation; 3202 location[CHILD_LEFT_INDEX] = child.mLeft; 3203 location[CHILD_TOP_INDEX] = child.mTop; 3204 Matrix childMatrix = child.getMatrix(); 3205 if (!childMatrix.isIdentity()) { 3206 RectF boundingRect = attachInfo.mTmpTransformRect; 3207 boundingRect.set(dirty); 3208 childMatrix.mapRect(boundingRect); 3209 dirty.set((int) boundingRect.left, (int) boundingRect.top, 3210 (int) (boundingRect.right + 0.5f), 3211 (int) (boundingRect.bottom + 0.5f)); 3212 } 3213 3214 // If the child is drawing an animation, we want to copy this flag onto 3215 // ourselves and the parent to make sure the invalidate request goes 3216 // through 3217 final boolean drawAnimation = (child.mPrivateFlags & DRAW_ANIMATION) == DRAW_ANIMATION; 3218 3219 // Check whether the child that requests the invalidate is fully opaque 3220 final boolean isOpaque = child.isOpaque() && !drawAnimation && 3221 child.getAnimation() != null; 3222 // Mark the child as dirty, using the appropriate flag 3223 // Make sure we do not set both flags at the same time 3224 final int opaqueFlag = isOpaque ? DIRTY_OPAQUE : DIRTY; 3225 3226 do { 3227 View view = null; 3228 if (parent instanceof View) { 3229 view = (View) parent; 3230 } 3231 3232 if (drawAnimation) { 3233 if (view != null) { 3234 view.mPrivateFlags |= DRAW_ANIMATION; 3235 } else if (parent instanceof ViewRoot) { 3236 ((ViewRoot) parent).mIsAnimating = true; 3237 } 3238 } 3239 3240 // If the parent is dirty opaque or not dirty, mark it dirty with the opaque 3241 // flag coming from the child that initiated the invalidate 3242 if (view != null && (view.mPrivateFlags & DIRTY_MASK) != DIRTY) { 3243 view.mPrivateFlags = (view.mPrivateFlags & ~DIRTY_MASK) | opaqueFlag; 3244 } 3245 3246 parent = parent.invalidateChildInParent(location, dirty); 3247 if (view != null) { 3248 // Account for transform on current parent 3249 Matrix m = view.getMatrix(); 3250 if (!m.isIdentity()) { 3251 RectF boundingRect = attachInfo.mTmpTransformRect; 3252 boundingRect.set(dirty); 3253 m.mapRect(boundingRect); 3254 dirty.set((int) boundingRect.left, (int) boundingRect.top, 3255 (int) (boundingRect.right + 0.5f), 3256 (int) (boundingRect.bottom + 0.5f)); 3257 } 3258 } 3259 } while (parent != null); 3260 } 3261 } 3262 3263 /** 3264 * Don't call or override this method. It is used for the implementation of 3265 * the view hierarchy. 3266 * 3267 * This implementation returns null if this ViewGroup does not have a parent, 3268 * if this ViewGroup is already fully invalidated or if the dirty rectangle 3269 * does not intersect with this ViewGroup's bounds. 3270 */ 3271 public ViewParent invalidateChildInParent(final int[] location, final Rect dirty) { 3272 if (ViewDebug.TRACE_HIERARCHY) { 3273 ViewDebug.trace(this, ViewDebug.HierarchyTraceType.INVALIDATE_CHILD_IN_PARENT); 3274 } 3275 3276 if ((mPrivateFlags & DRAWN) == DRAWN) { 3277 if ((mGroupFlags & (FLAG_OPTIMIZE_INVALIDATE | FLAG_ANIMATION_DONE)) != 3278 FLAG_OPTIMIZE_INVALIDATE) { 3279 dirty.offset(location[CHILD_LEFT_INDEX] - mScrollX, 3280 location[CHILD_TOP_INDEX] - mScrollY); 3281 3282 final int left = mLeft; 3283 final int top = mTop; 3284 3285 if (dirty.intersect(0, 0, mRight - left, mBottom - top) || 3286 (mPrivateFlags & DRAW_ANIMATION) == DRAW_ANIMATION) { 3287 mPrivateFlags &= ~DRAWING_CACHE_VALID; 3288 3289 location[CHILD_LEFT_INDEX] = left; 3290 location[CHILD_TOP_INDEX] = top; 3291 3292 return mParent; 3293 } 3294 } else { 3295 mPrivateFlags &= ~DRAWN & ~DRAWING_CACHE_VALID; 3296 3297 location[CHILD_LEFT_INDEX] = mLeft; 3298 location[CHILD_TOP_INDEX] = mTop; 3299 3300 dirty.set(0, 0, mRight - location[CHILD_LEFT_INDEX], 3301 mBottom - location[CHILD_TOP_INDEX]); 3302 3303 return mParent; 3304 } 3305 } 3306 3307 return null; 3308 } 3309 3310 /** 3311 * Offset a rectangle that is in a descendant's coordinate 3312 * space into our coordinate space. 3313 * @param descendant A descendant of this view 3314 * @param rect A rectangle defined in descendant's coordinate space. 3315 */ 3316 public final void offsetDescendantRectToMyCoords(View descendant, Rect rect) { 3317 offsetRectBetweenParentAndChild(descendant, rect, true, false); 3318 } 3319 3320 /** 3321 * Offset a rectangle that is in our coordinate space into an ancestor's 3322 * coordinate space. 3323 * @param descendant A descendant of this view 3324 * @param rect A rectangle defined in descendant's coordinate space. 3325 */ 3326 public final void offsetRectIntoDescendantCoords(View descendant, Rect rect) { 3327 offsetRectBetweenParentAndChild(descendant, rect, false, false); 3328 } 3329 3330 /** 3331 * Helper method that offsets a rect either from parent to descendant or 3332 * descendant to parent. 3333 */ 3334 void offsetRectBetweenParentAndChild(View descendant, Rect rect, 3335 boolean offsetFromChildToParent, boolean clipToBounds) { 3336 3337 // already in the same coord system :) 3338 if (descendant == this) { 3339 return; 3340 } 3341 3342 ViewParent theParent = descendant.mParent; 3343 3344 // search and offset up to the parent 3345 while ((theParent != null) 3346 && (theParent instanceof View) 3347 && (theParent != this)) { 3348 3349 if (offsetFromChildToParent) { 3350 rect.offset(descendant.mLeft - descendant.mScrollX, 3351 descendant.mTop - descendant.mScrollY); 3352 if (clipToBounds) { 3353 View p = (View) theParent; 3354 rect.intersect(0, 0, p.mRight - p.mLeft, p.mBottom - p.mTop); 3355 } 3356 } else { 3357 if (clipToBounds) { 3358 View p = (View) theParent; 3359 rect.intersect(0, 0, p.mRight - p.mLeft, p.mBottom - p.mTop); 3360 } 3361 rect.offset(descendant.mScrollX - descendant.mLeft, 3362 descendant.mScrollY - descendant.mTop); 3363 } 3364 3365 descendant = (View) theParent; 3366 theParent = descendant.mParent; 3367 } 3368 3369 // now that we are up to this view, need to offset one more time 3370 // to get into our coordinate space 3371 if (theParent == this) { 3372 if (offsetFromChildToParent) { 3373 rect.offset(descendant.mLeft - descendant.mScrollX, 3374 descendant.mTop - descendant.mScrollY); 3375 } else { 3376 rect.offset(descendant.mScrollX - descendant.mLeft, 3377 descendant.mScrollY - descendant.mTop); 3378 } 3379 } else { 3380 throw new IllegalArgumentException("parameter must be a descendant of this view"); 3381 } 3382 } 3383 3384 /** 3385 * Offset the vertical location of all children of this view by the specified number of pixels. 3386 * 3387 * @param offset the number of pixels to offset 3388 * 3389 * @hide 3390 */ 3391 public void offsetChildrenTopAndBottom(int offset) { 3392 final int count = mChildrenCount; 3393 final View[] children = mChildren; 3394 3395 for (int i = 0; i < count; i++) { 3396 final View v = children[i]; 3397 v.mTop += offset; 3398 v.mBottom += offset; 3399 } 3400 } 3401 3402 /** 3403 * {@inheritDoc} 3404 */ 3405 public boolean getChildVisibleRect(View child, Rect r, android.graphics.Point offset) { 3406 int dx = child.mLeft - mScrollX; 3407 int dy = child.mTop - mScrollY; 3408 if (offset != null) { 3409 offset.x += dx; 3410 offset.y += dy; 3411 } 3412 r.offset(dx, dy); 3413 return r.intersect(0, 0, mRight - mLeft, mBottom - mTop) && 3414 (mParent == null || mParent.getChildVisibleRect(this, r, offset)); 3415 } 3416 3417 /** 3418 * {@inheritDoc} 3419 */ 3420 @Override 3421 protected abstract void onLayout(boolean changed, 3422 int l, int t, int r, int b); 3423 3424 /** 3425 * Indicates whether the view group has the ability to animate its children 3426 * after the first layout. 3427 * 3428 * @return true if the children can be animated, false otherwise 3429 */ 3430 protected boolean canAnimate() { 3431 return mLayoutAnimationController != null; 3432 } 3433 3434 /** 3435 * Runs the layout animation. Calling this method triggers a relayout of 3436 * this view group. 3437 */ 3438 public void startLayoutAnimation() { 3439 if (mLayoutAnimationController != null) { 3440 mGroupFlags |= FLAG_RUN_ANIMATION; 3441 requestLayout(); 3442 } 3443 } 3444 3445 /** 3446 * Schedules the layout animation to be played after the next layout pass 3447 * of this view group. This can be used to restart the layout animation 3448 * when the content of the view group changes or when the activity is 3449 * paused and resumed. 3450 */ 3451 public void scheduleLayoutAnimation() { 3452 mGroupFlags |= FLAG_RUN_ANIMATION; 3453 } 3454 3455 /** 3456 * Sets the layout animation controller used to animate the group's 3457 * children after the first layout. 3458 * 3459 * @param controller the animation controller 3460 */ 3461 public void setLayoutAnimation(LayoutAnimationController controller) { 3462 mLayoutAnimationController = controller; 3463 if (mLayoutAnimationController != null) { 3464 mGroupFlags |= FLAG_RUN_ANIMATION; 3465 } 3466 } 3467 3468 /** 3469 * Returns the layout animation controller used to animate the group's 3470 * children. 3471 * 3472 * @return the current animation controller 3473 */ 3474 public LayoutAnimationController getLayoutAnimation() { 3475 return mLayoutAnimationController; 3476 } 3477 3478 /** 3479 * Indicates whether the children's drawing cache is used during a layout 3480 * animation. By default, the drawing cache is enabled but this will prevent 3481 * nested layout animations from working. To nest animations, you must disable 3482 * the cache. 3483 * 3484 * @return true if the animation cache is enabled, false otherwise 3485 * 3486 * @see #setAnimationCacheEnabled(boolean) 3487 * @see View#setDrawingCacheEnabled(boolean) 3488 */ 3489 @ViewDebug.ExportedProperty 3490 public boolean isAnimationCacheEnabled() { 3491 return (mGroupFlags & FLAG_ANIMATION_CACHE) == FLAG_ANIMATION_CACHE; 3492 } 3493 3494 /** 3495 * Enables or disables the children's drawing cache during a layout animation. 3496 * By default, the drawing cache is enabled but this will prevent nested 3497 * layout animations from working. To nest animations, you must disable the 3498 * cache. 3499 * 3500 * @param enabled true to enable the animation cache, false otherwise 3501 * 3502 * @see #isAnimationCacheEnabled() 3503 * @see View#setDrawingCacheEnabled(boolean) 3504 */ 3505 public void setAnimationCacheEnabled(boolean enabled) { 3506 setBooleanFlag(FLAG_ANIMATION_CACHE, enabled); 3507 } 3508 3509 /** 3510 * Indicates whether this ViewGroup will always try to draw its children using their 3511 * drawing cache. By default this property is enabled. 3512 * 3513 * @return true if the animation cache is enabled, false otherwise 3514 * 3515 * @see #setAlwaysDrawnWithCacheEnabled(boolean) 3516 * @see #setChildrenDrawnWithCacheEnabled(boolean) 3517 * @see View#setDrawingCacheEnabled(boolean) 3518 */ 3519 @ViewDebug.ExportedProperty(category = "drawing") 3520 public boolean isAlwaysDrawnWithCacheEnabled() { 3521 return (mGroupFlags & FLAG_ALWAYS_DRAWN_WITH_CACHE) == FLAG_ALWAYS_DRAWN_WITH_CACHE; 3522 } 3523 3524 /** 3525 * Indicates whether this ViewGroup will always try to draw its children using their 3526 * drawing cache. This property can be set to true when the cache rendering is 3527 * slightly different from the children's normal rendering. Renderings can be different, 3528 * for instance, when the cache's quality is set to low. 3529 * 3530 * When this property is disabled, the ViewGroup will use the drawing cache of its 3531 * children only when asked to. It's usually the task of subclasses to tell ViewGroup 3532 * when to start using the drawing cache and when to stop using it. 3533 * 3534 * @param always true to always draw with the drawing cache, false otherwise 3535 * 3536 * @see #isAlwaysDrawnWithCacheEnabled() 3537 * @see #setChildrenDrawnWithCacheEnabled(boolean) 3538 * @see View#setDrawingCacheEnabled(boolean) 3539 * @see View#setDrawingCacheQuality(int) 3540 */ 3541 public void setAlwaysDrawnWithCacheEnabled(boolean always) { 3542 setBooleanFlag(FLAG_ALWAYS_DRAWN_WITH_CACHE, always); 3543 } 3544 3545 /** 3546 * Indicates whether the ViewGroup is currently drawing its children using 3547 * their drawing cache. 3548 * 3549 * @return true if children should be drawn with their cache, false otherwise 3550 * 3551 * @see #setAlwaysDrawnWithCacheEnabled(boolean) 3552 * @see #setChildrenDrawnWithCacheEnabled(boolean) 3553 */ 3554 @ViewDebug.ExportedProperty(category = "drawing") 3555 protected boolean isChildrenDrawnWithCacheEnabled() { 3556 return (mGroupFlags & FLAG_CHILDREN_DRAWN_WITH_CACHE) == FLAG_CHILDREN_DRAWN_WITH_CACHE; 3557 } 3558 3559 /** 3560 * Tells the ViewGroup to draw its children using their drawing cache. This property 3561 * is ignored when {@link #isAlwaysDrawnWithCacheEnabled()} is true. A child's drawing cache 3562 * will be used only if it has been enabled. 3563 * 3564 * Subclasses should call this method to start and stop using the drawing cache when 3565 * they perform performance sensitive operations, like scrolling or animating. 3566 * 3567 * @param enabled true if children should be drawn with their cache, false otherwise 3568 * 3569 * @see #setAlwaysDrawnWithCacheEnabled(boolean) 3570 * @see #isChildrenDrawnWithCacheEnabled() 3571 */ 3572 protected void setChildrenDrawnWithCacheEnabled(boolean enabled) { 3573 setBooleanFlag(FLAG_CHILDREN_DRAWN_WITH_CACHE, enabled); 3574 } 3575 3576 /** 3577 * Indicates whether the ViewGroup is drawing its children in the order defined by 3578 * {@link #getChildDrawingOrder(int, int)}. 3579 * 3580 * @return true if children drawing order is defined by {@link #getChildDrawingOrder(int, int)}, 3581 * false otherwise 3582 * 3583 * @see #setChildrenDrawingOrderEnabled(boolean) 3584 * @see #getChildDrawingOrder(int, int) 3585 */ 3586 @ViewDebug.ExportedProperty(category = "drawing") 3587 protected boolean isChildrenDrawingOrderEnabled() { 3588 return (mGroupFlags & FLAG_USE_CHILD_DRAWING_ORDER) == FLAG_USE_CHILD_DRAWING_ORDER; 3589 } 3590 3591 /** 3592 * Tells the ViewGroup whether to draw its children in the order defined by the method 3593 * {@link #getChildDrawingOrder(int, int)}. 3594 * 3595 * @param enabled true if the order of the children when drawing is determined by 3596 * {@link #getChildDrawingOrder(int, int)}, false otherwise 3597 * 3598 * @see #isChildrenDrawingOrderEnabled() 3599 * @see #getChildDrawingOrder(int, int) 3600 */ 3601 protected void setChildrenDrawingOrderEnabled(boolean enabled) { 3602 setBooleanFlag(FLAG_USE_CHILD_DRAWING_ORDER, enabled); 3603 } 3604 3605 private void setBooleanFlag(int flag, boolean value) { 3606 if (value) { 3607 mGroupFlags |= flag; 3608 } else { 3609 mGroupFlags &= ~flag; 3610 } 3611 } 3612 3613 /** 3614 * Returns an integer indicating what types of drawing caches are kept in memory. 3615 * 3616 * @see #setPersistentDrawingCache(int) 3617 * @see #setAnimationCacheEnabled(boolean) 3618 * 3619 * @return one or a combination of {@link #PERSISTENT_NO_CACHE}, 3620 * {@link #PERSISTENT_ANIMATION_CACHE}, {@link #PERSISTENT_SCROLLING_CACHE} 3621 * and {@link #PERSISTENT_ALL_CACHES} 3622 */ 3623 @ViewDebug.ExportedProperty(category = "drawing", mapping = { 3624 @ViewDebug.IntToString(from = PERSISTENT_NO_CACHE, to = "NONE"), 3625 @ViewDebug.IntToString(from = PERSISTENT_ANIMATION_CACHE, to = "ANIMATION"), 3626 @ViewDebug.IntToString(from = PERSISTENT_SCROLLING_CACHE, to = "SCROLLING"), 3627 @ViewDebug.IntToString(from = PERSISTENT_ALL_CACHES, to = "ALL") 3628 }) 3629 public int getPersistentDrawingCache() { 3630 return mPersistentDrawingCache; 3631 } 3632 3633 /** 3634 * Indicates what types of drawing caches should be kept in memory after 3635 * they have been created. 3636 * 3637 * @see #getPersistentDrawingCache() 3638 * @see #setAnimationCacheEnabled(boolean) 3639 * 3640 * @param drawingCacheToKeep one or a combination of {@link #PERSISTENT_NO_CACHE}, 3641 * {@link #PERSISTENT_ANIMATION_CACHE}, {@link #PERSISTENT_SCROLLING_CACHE} 3642 * and {@link #PERSISTENT_ALL_CACHES} 3643 */ 3644 public void setPersistentDrawingCache(int drawingCacheToKeep) { 3645 mPersistentDrawingCache = drawingCacheToKeep & PERSISTENT_ALL_CACHES; 3646 } 3647 3648 /** 3649 * Returns a new set of layout parameters based on the supplied attributes set. 3650 * 3651 * @param attrs the attributes to build the layout parameters from 3652 * 3653 * @return an instance of {@link android.view.ViewGroup.LayoutParams} or one 3654 * of its descendants 3655 */ 3656 public LayoutParams generateLayoutParams(AttributeSet attrs) { 3657 return new LayoutParams(getContext(), attrs); 3658 } 3659 3660 /** 3661 * Returns a safe set of layout parameters based on the supplied layout params. 3662 * When a ViewGroup is passed a View whose layout params do not pass the test of 3663 * {@link #checkLayoutParams(android.view.ViewGroup.LayoutParams)}, this method 3664 * is invoked. This method should return a new set of layout params suitable for 3665 * this ViewGroup, possibly by copying the appropriate attributes from the 3666 * specified set of layout params. 3667 * 3668 * @param p The layout parameters to convert into a suitable set of layout parameters 3669 * for this ViewGroup. 3670 * 3671 * @return an instance of {@link android.view.ViewGroup.LayoutParams} or one 3672 * of its descendants 3673 */ 3674 protected LayoutParams generateLayoutParams(ViewGroup.LayoutParams p) { 3675 return p; 3676 } 3677 3678 /** 3679 * Returns a set of default layout parameters. These parameters are requested 3680 * when the View passed to {@link #addView(View)} has no layout parameters 3681 * already set. If null is returned, an exception is thrown from addView. 3682 * 3683 * @return a set of default layout parameters or null 3684 */ 3685 protected LayoutParams generateDefaultLayoutParams() { 3686 return new LayoutParams(LayoutParams.WRAP_CONTENT, LayoutParams.WRAP_CONTENT); 3687 } 3688 3689 /** 3690 * @hide 3691 */ 3692 @Override 3693 protected boolean dispatchConsistencyCheck(int consistency) { 3694 boolean result = super.dispatchConsistencyCheck(consistency); 3695 3696 final int count = mChildrenCount; 3697 final View[] children = mChildren; 3698 for (int i = 0; i < count; i++) { 3699 if (!children[i].dispatchConsistencyCheck(consistency)) result = false; 3700 } 3701 3702 return result; 3703 } 3704 3705 /** 3706 * @hide 3707 */ 3708 @Override 3709 protected boolean onConsistencyCheck(int consistency) { 3710 boolean result = super.onConsistencyCheck(consistency); 3711 3712 final boolean checkLayout = (consistency & ViewDebug.CONSISTENCY_LAYOUT) != 0; 3713 final boolean checkDrawing = (consistency & ViewDebug.CONSISTENCY_DRAWING) != 0; 3714 3715 if (checkLayout) { 3716 final int count = mChildrenCount; 3717 final View[] children = mChildren; 3718 for (int i = 0; i < count; i++) { 3719 if (children[i].getParent() != this) { 3720 result = false; 3721 android.util.Log.d(ViewDebug.CONSISTENCY_LOG_TAG, 3722 "View " + children[i] + " has no parent/a parent that is not " + this); 3723 } 3724 } 3725 } 3726 3727 if (checkDrawing) { 3728 // If this group is dirty, check that the parent is dirty as well 3729 if ((mPrivateFlags & DIRTY_MASK) != 0) { 3730 final ViewParent parent = getParent(); 3731 if (parent != null && !(parent instanceof ViewRoot)) { 3732 if ((((View) parent).mPrivateFlags & DIRTY_MASK) == 0) { 3733 result = false; 3734 android.util.Log.d(ViewDebug.CONSISTENCY_LOG_TAG, 3735 "ViewGroup " + this + " is dirty but its parent is not: " + this); 3736 } 3737 } 3738 } 3739 } 3740 3741 return result; 3742 } 3743 3744 /** 3745 * {@inheritDoc} 3746 */ 3747 @Override 3748 protected void debug(int depth) { 3749 super.debug(depth); 3750 String output; 3751 3752 if (mFocused != null) { 3753 output = debugIndent(depth); 3754 output += "mFocused"; 3755 Log.d(VIEW_LOG_TAG, output); 3756 } 3757 if (mChildrenCount != 0) { 3758 output = debugIndent(depth); 3759 output += "{"; 3760 Log.d(VIEW_LOG_TAG, output); 3761 } 3762 int count = mChildrenCount; 3763 for (int i = 0; i < count; i++) { 3764 View child = mChildren[i]; 3765 child.debug(depth + 1); 3766 } 3767 3768 if (mChildrenCount != 0) { 3769 output = debugIndent(depth); 3770 output += "}"; 3771 Log.d(VIEW_LOG_TAG, output); 3772 } 3773 } 3774 3775 /** 3776 * Returns the position in the group of the specified child view. 3777 * 3778 * @param child the view for which to get the position 3779 * @return a positive integer representing the position of the view in the 3780 * group, or -1 if the view does not exist in the group 3781 */ 3782 public int indexOfChild(View child) { 3783 final int count = mChildrenCount; 3784 final View[] children = mChildren; 3785 for (int i = 0; i < count; i++) { 3786 if (children[i] == child) { 3787 return i; 3788 } 3789 } 3790 return -1; 3791 } 3792 3793 /** 3794 * Returns the number of children in the group. 3795 * 3796 * @return a positive integer representing the number of children in 3797 * the group 3798 */ 3799 public int getChildCount() { 3800 return mChildrenCount; 3801 } 3802 3803 /** 3804 * Returns the view at the specified position in the group. 3805 * 3806 * @param index the position at which to get the view from 3807 * @return the view at the specified position or null if the position 3808 * does not exist within the group 3809 */ 3810 public View getChildAt(int index) { 3811 try { 3812 return mChildren[index]; 3813 } catch (IndexOutOfBoundsException ex) { 3814 return null; 3815 } 3816 } 3817 3818 /** 3819 * Ask all of the children of this view to measure themselves, taking into 3820 * account both the MeasureSpec requirements for this view and its padding. 3821 * We skip children that are in the GONE state The heavy lifting is done in 3822 * getChildMeasureSpec. 3823 * 3824 * @param widthMeasureSpec The width requirements for this view 3825 * @param heightMeasureSpec The height requirements for this view 3826 */ 3827 protected void measureChildren(int widthMeasureSpec, int heightMeasureSpec) { 3828 final int size = mChildrenCount; 3829 final View[] children = mChildren; 3830 for (int i = 0; i < size; ++i) { 3831 final View child = children[i]; 3832 if ((child.mViewFlags & VISIBILITY_MASK) != GONE) { 3833 measureChild(child, widthMeasureSpec, heightMeasureSpec); 3834 } 3835 } 3836 } 3837 3838 /** 3839 * Ask one of the children of this view to measure itself, taking into 3840 * account both the MeasureSpec requirements for this view and its padding. 3841 * The heavy lifting is done in getChildMeasureSpec. 3842 * 3843 * @param child The child to measure 3844 * @param parentWidthMeasureSpec The width requirements for this view 3845 * @param parentHeightMeasureSpec The height requirements for this view 3846 */ 3847 protected void measureChild(View child, int parentWidthMeasureSpec, 3848 int parentHeightMeasureSpec) { 3849 final LayoutParams lp = child.getLayoutParams(); 3850 3851 final int childWidthMeasureSpec = getChildMeasureSpec(parentWidthMeasureSpec, 3852 mPaddingLeft + mPaddingRight, lp.width); 3853 final int childHeightMeasureSpec = getChildMeasureSpec(parentHeightMeasureSpec, 3854 mPaddingTop + mPaddingBottom, lp.height); 3855 3856 child.measure(childWidthMeasureSpec, childHeightMeasureSpec); 3857 } 3858 3859 /** 3860 * Ask one of the children of this view to measure itself, taking into 3861 * account both the MeasureSpec requirements for this view and its padding 3862 * and margins. The child must have MarginLayoutParams The heavy lifting is 3863 * done in getChildMeasureSpec. 3864 * 3865 * @param child The child to measure 3866 * @param parentWidthMeasureSpec The width requirements for this view 3867 * @param widthUsed Extra space that has been used up by the parent 3868 * horizontally (possibly by other children of the parent) 3869 * @param parentHeightMeasureSpec The height requirements for this view 3870 * @param heightUsed Extra space that has been used up by the parent 3871 * vertically (possibly by other children of the parent) 3872 */ 3873 protected void measureChildWithMargins(View child, 3874 int parentWidthMeasureSpec, int widthUsed, 3875 int parentHeightMeasureSpec, int heightUsed) { 3876 final MarginLayoutParams lp = (MarginLayoutParams) child.getLayoutParams(); 3877 3878 final int childWidthMeasureSpec = getChildMeasureSpec(parentWidthMeasureSpec, 3879 mPaddingLeft + mPaddingRight + lp.leftMargin + lp.rightMargin 3880 + widthUsed, lp.width); 3881 final int childHeightMeasureSpec = getChildMeasureSpec(parentHeightMeasureSpec, 3882 mPaddingTop + mPaddingBottom + lp.topMargin + lp.bottomMargin 3883 + heightUsed, lp.height); 3884 3885 child.measure(childWidthMeasureSpec, childHeightMeasureSpec); 3886 } 3887 3888 /** 3889 * Does the hard part of measureChildren: figuring out the MeasureSpec to 3890 * pass to a particular child. This method figures out the right MeasureSpec 3891 * for one dimension (height or width) of one child view. 3892 * 3893 * The goal is to combine information from our MeasureSpec with the 3894 * LayoutParams of the child to get the best possible results. For example, 3895 * if the this view knows its size (because its MeasureSpec has a mode of 3896 * EXACTLY), and the child has indicated in its LayoutParams that it wants 3897 * to be the same size as the parent, the parent should ask the child to 3898 * layout given an exact size. 3899 * 3900 * @param spec The requirements for this view 3901 * @param padding The padding of this view for the current dimension and 3902 * margins, if applicable 3903 * @param childDimension How big the child wants to be in the current 3904 * dimension 3905 * @return a MeasureSpec integer for the child 3906 */ 3907 public static int getChildMeasureSpec(int spec, int padding, int childDimension) { 3908 int specMode = MeasureSpec.getMode(spec); 3909 int specSize = MeasureSpec.getSize(spec); 3910 3911 int size = Math.max(0, specSize - padding); 3912 3913 int resultSize = 0; 3914 int resultMode = 0; 3915 3916 switch (specMode) { 3917 // Parent has imposed an exact size on us 3918 case MeasureSpec.EXACTLY: 3919 if (childDimension >= 0) { 3920 resultSize = childDimension; 3921 resultMode = MeasureSpec.EXACTLY; 3922 } else if (childDimension == LayoutParams.MATCH_PARENT) { 3923 // Child wants to be our size. So be it. 3924 resultSize = size; 3925 resultMode = MeasureSpec.EXACTLY; 3926 } else if (childDimension == LayoutParams.WRAP_CONTENT) { 3927 // Child wants to determine its own size. It can't be 3928 // bigger than us. 3929 resultSize = size; 3930 resultMode = MeasureSpec.AT_MOST; 3931 } 3932 break; 3933 3934 // Parent has imposed a maximum size on us 3935 case MeasureSpec.AT_MOST: 3936 if (childDimension >= 0) { 3937 // Child wants a specific size... so be it 3938 resultSize = childDimension; 3939 resultMode = MeasureSpec.EXACTLY; 3940 } else if (childDimension == LayoutParams.MATCH_PARENT) { 3941 // Child wants to be our size, but our size is not fixed. 3942 // Constrain child to not be bigger than us. 3943 resultSize = size; 3944 resultMode = MeasureSpec.AT_MOST; 3945 } else if (childDimension == LayoutParams.WRAP_CONTENT) { 3946 // Child wants to determine its own size. It can't be 3947 // bigger than us. 3948 resultSize = size; 3949 resultMode = MeasureSpec.AT_MOST; 3950 } 3951 break; 3952 3953 // Parent asked to see how big we want to be 3954 case MeasureSpec.UNSPECIFIED: 3955 if (childDimension >= 0) { 3956 // Child wants a specific size... let him have it 3957 resultSize = childDimension; 3958 resultMode = MeasureSpec.EXACTLY; 3959 } else if (childDimension == LayoutParams.MATCH_PARENT) { 3960 // Child wants to be our size... find out how big it should 3961 // be 3962 resultSize = 0; 3963 resultMode = MeasureSpec.UNSPECIFIED; 3964 } else if (childDimension == LayoutParams.WRAP_CONTENT) { 3965 // Child wants to determine its own size.... find out how 3966 // big it should be 3967 resultSize = 0; 3968 resultMode = MeasureSpec.UNSPECIFIED; 3969 } 3970 break; 3971 } 3972 return MeasureSpec.makeMeasureSpec(resultSize, resultMode); 3973 } 3974 3975 3976 /** 3977 * Removes any pending animations for views that have been removed. Call 3978 * this if you don't want animations for exiting views to stack up. 3979 */ 3980 public void clearDisappearingChildren() { 3981 if (mDisappearingChildren != null) { 3982 mDisappearingChildren.clear(); 3983 } 3984 } 3985 3986 /** 3987 * Add a view which is removed from mChildren but still needs animation 3988 * 3989 * @param v View to add 3990 */ 3991 private void addDisappearingView(View v) { 3992 ArrayList<View> disappearingChildren = mDisappearingChildren; 3993 3994 if (disappearingChildren == null) { 3995 disappearingChildren = mDisappearingChildren = new ArrayList<View>(); 3996 } 3997 3998 disappearingChildren.add(v); 3999 } 4000 4001 /** 4002 * Cleanup a view when its animation is done. This may mean removing it from 4003 * the list of disappearing views. 4004 * 4005 * @param view The view whose animation has finished 4006 * @param animation The animation, cannot be null 4007 */ 4008 private void finishAnimatingView(final View view, Animation animation) { 4009 final ArrayList<View> disappearingChildren = mDisappearingChildren; 4010 if (disappearingChildren != null) { 4011 if (disappearingChildren.contains(view)) { 4012 disappearingChildren.remove(view); 4013 4014 if (view.mAttachInfo != null) { 4015 view.dispatchDetachedFromWindow(); 4016 } 4017 4018 view.clearAnimation(); 4019 mGroupFlags |= FLAG_INVALIDATE_REQUIRED; 4020 } 4021 } 4022 4023 if (animation != null && !animation.getFillAfter()) { 4024 view.clearAnimation(); 4025 } 4026 4027 if ((view.mPrivateFlags & ANIMATION_STARTED) == ANIMATION_STARTED) { 4028 view.onAnimationEnd(); 4029 // Should be performed by onAnimationEnd() but this avoid an infinite loop, 4030 // so we'd rather be safe than sorry 4031 view.mPrivateFlags &= ~ANIMATION_STARTED; 4032 // Draw one more frame after the animation is done 4033 mGroupFlags |= FLAG_INVALIDATE_REQUIRED; 4034 } 4035 } 4036 4037 /** 4038 * This method tells the ViewGroup that the given View object, which should have this 4039 * ViewGroup as its parent, 4040 * should be kept around (re-displayed when the ViewGroup draws its children) even if it 4041 * is removed from its parent. This allows animations, such as those used by 4042 * {@link android.app.Fragment} and {@link android.animation.LayoutTransition} to animate 4043 * the removal of views. A call to this method should always be accompanied by a later call 4044 * to {@link #endViewTransition(View)}, such as after an animation on the View has finished, 4045 * so that the View finally gets removed. 4046 * 4047 * @param view The View object to be kept visible even if it gets removed from its parent. 4048 */ 4049 public void startViewTransition(View view) { 4050 if (view.mParent == this) { 4051 if (mTransitioningViews == null) { 4052 mTransitioningViews = new ArrayList<View>(); 4053 } 4054 mTransitioningViews.add(view); 4055 } 4056 } 4057 4058 /** 4059 * This method should always be called following an earlier call to 4060 * {@link #startViewTransition(View)}. The given View is finally removed from its parent 4061 * and will no longer be displayed. Note that this method does not perform the functionality 4062 * of removing a view from its parent; it just discontinues the display of a View that 4063 * has previously been removed. 4064 * 4065 * @return view The View object that has been removed but is being kept around in the visible 4066 * hierarchy by an earlier call to {@link #startViewTransition(View)}. 4067 */ 4068 public void endViewTransition(View view) { 4069 if (mTransitioningViews != null) { 4070 mTransitioningViews.remove(view); 4071 final ArrayList<View> disappearingChildren = mDisappearingChildren; 4072 if (disappearingChildren != null && disappearingChildren.contains(view)) { 4073 disappearingChildren.remove(view); 4074 if (mVisibilityChangingChildren != null && 4075 mVisibilityChangingChildren.contains(view)) { 4076 mVisibilityChangingChildren.remove(view); 4077 } else { 4078 if (view.mAttachInfo != null) { 4079 view.dispatchDetachedFromWindow(); 4080 } 4081 if (view.mParent != null) { 4082 view.mParent = null; 4083 } 4084 } 4085 mGroupFlags |= FLAG_INVALIDATE_REQUIRED; 4086 } 4087 } 4088 } 4089 4090 private LayoutTransition.TransitionListener mLayoutTransitionListener = 4091 new LayoutTransition.TransitionListener() { 4092 @Override 4093 public void startTransition(LayoutTransition transition, ViewGroup container, 4094 View view, int transitionType) { 4095 // We only care about disappearing items, since we need special logic to keep 4096 // those items visible after they've been 'removed' 4097 if (transitionType == LayoutTransition.DISAPPEARING) { 4098 startViewTransition(view); 4099 } 4100 } 4101 4102 @Override 4103 public void endTransition(LayoutTransition transition, ViewGroup container, 4104 View view, int transitionType) { 4105 if (transitionType == LayoutTransition.DISAPPEARING && mTransitioningViews != null) { 4106 endViewTransition(view); 4107 } 4108 } 4109 }; 4110 4111 /** 4112 * {@inheritDoc} 4113 */ 4114 @Override 4115 public boolean gatherTransparentRegion(Region region) { 4116 // If no transparent regions requested, we are always opaque. 4117 final boolean meOpaque = (mPrivateFlags & View.REQUEST_TRANSPARENT_REGIONS) == 0; 4118 if (meOpaque && region == null) { 4119 // The caller doesn't care about the region, so stop now. 4120 return true; 4121 } 4122 super.gatherTransparentRegion(region); 4123 final View[] children = mChildren; 4124 final int count = mChildrenCount; 4125 boolean noneOfTheChildrenAreTransparent = true; 4126 for (int i = 0; i < count; i++) { 4127 final View child = children[i]; 4128 if ((child.mViewFlags & VISIBILITY_MASK) != GONE || child.getAnimation() != null) { 4129 if (!child.gatherTransparentRegion(region)) { 4130 noneOfTheChildrenAreTransparent = false; 4131 } 4132 } 4133 } 4134 return meOpaque || noneOfTheChildrenAreTransparent; 4135 } 4136 4137 /** 4138 * {@inheritDoc} 4139 */ 4140 public void requestTransparentRegion(View child) { 4141 if (child != null) { 4142 child.mPrivateFlags |= View.REQUEST_TRANSPARENT_REGIONS; 4143 if (mParent != null) { 4144 mParent.requestTransparentRegion(this); 4145 } 4146 } 4147 } 4148 4149 4150 @Override 4151 protected boolean fitSystemWindows(Rect insets) { 4152 boolean done = super.fitSystemWindows(insets); 4153 if (!done) { 4154 final int count = mChildrenCount; 4155 final View[] children = mChildren; 4156 for (int i = 0; i < count; i++) { 4157 done = children[i].fitSystemWindows(insets); 4158 if (done) { 4159 break; 4160 } 4161 } 4162 } 4163 return done; 4164 } 4165 4166 /** 4167 * Returns the animation listener to which layout animation events are 4168 * sent. 4169 * 4170 * @return an {@link android.view.animation.Animation.AnimationListener} 4171 */ 4172 public Animation.AnimationListener getLayoutAnimationListener() { 4173 return mAnimationListener; 4174 } 4175 4176 @Override 4177 protected void drawableStateChanged() { 4178 super.drawableStateChanged(); 4179 4180 if ((mGroupFlags & FLAG_NOTIFY_CHILDREN_ON_DRAWABLE_STATE_CHANGE) != 0) { 4181 if ((mGroupFlags & FLAG_ADD_STATES_FROM_CHILDREN) != 0) { 4182 throw new IllegalStateException("addStateFromChildren cannot be enabled if a" 4183 + " child has duplicateParentState set to true"); 4184 } 4185 4186 final View[] children = mChildren; 4187 final int count = mChildrenCount; 4188 4189 for (int i = 0; i < count; i++) { 4190 final View child = children[i]; 4191 if ((child.mViewFlags & DUPLICATE_PARENT_STATE) != 0) { 4192 child.refreshDrawableState(); 4193 } 4194 } 4195 } 4196 } 4197 4198 @Override 4199 protected int[] onCreateDrawableState(int extraSpace) { 4200 if ((mGroupFlags & FLAG_ADD_STATES_FROM_CHILDREN) == 0) { 4201 return super.onCreateDrawableState(extraSpace); 4202 } 4203 4204 int need = 0; 4205 int n = getChildCount(); 4206 for (int i = 0; i < n; i++) { 4207 int[] childState = getChildAt(i).getDrawableState(); 4208 4209 if (childState != null) { 4210 need += childState.length; 4211 } 4212 } 4213 4214 int[] state = super.onCreateDrawableState(extraSpace + need); 4215 4216 for (int i = 0; i < n; i++) { 4217 int[] childState = getChildAt(i).getDrawableState(); 4218 4219 if (childState != null) { 4220 state = mergeDrawableStates(state, childState); 4221 } 4222 } 4223 4224 return state; 4225 } 4226 4227 /** 4228 * Sets whether this ViewGroup's drawable states also include 4229 * its children's drawable states. This is used, for example, to 4230 * make a group appear to be focused when its child EditText or button 4231 * is focused. 4232 */ 4233 public void setAddStatesFromChildren(boolean addsStates) { 4234 if (addsStates) { 4235 mGroupFlags |= FLAG_ADD_STATES_FROM_CHILDREN; 4236 } else { 4237 mGroupFlags &= ~FLAG_ADD_STATES_FROM_CHILDREN; 4238 } 4239 4240 refreshDrawableState(); 4241 } 4242 4243 /** 4244 * Returns whether this ViewGroup's drawable states also include 4245 * its children's drawable states. This is used, for example, to 4246 * make a group appear to be focused when its child EditText or button 4247 * is focused. 4248 */ 4249 public boolean addStatesFromChildren() { 4250 return (mGroupFlags & FLAG_ADD_STATES_FROM_CHILDREN) != 0; 4251 } 4252 4253 /** 4254 * If {link #addStatesFromChildren} is true, refreshes this group's 4255 * drawable state (to include the states from its children). 4256 */ 4257 public void childDrawableStateChanged(View child) { 4258 if ((mGroupFlags & FLAG_ADD_STATES_FROM_CHILDREN) != 0) { 4259 refreshDrawableState(); 4260 } 4261 } 4262 4263 /** 4264 * Specifies the animation listener to which layout animation events must 4265 * be sent. Only 4266 * {@link android.view.animation.Animation.AnimationListener#onAnimationStart(Animation)} 4267 * and 4268 * {@link android.view.animation.Animation.AnimationListener#onAnimationEnd(Animation)} 4269 * are invoked. 4270 * 4271 * @param animationListener the layout animation listener 4272 */ 4273 public void setLayoutAnimationListener(Animation.AnimationListener animationListener) { 4274 mAnimationListener = animationListener; 4275 } 4276 4277 /** 4278 * LayoutParams are used by views to tell their parents how they want to be 4279 * laid out. See 4280 * {@link android.R.styleable#ViewGroup_Layout ViewGroup Layout Attributes} 4281 * for a list of all child view attributes that this class supports. 4282 * 4283 * <p> 4284 * The base LayoutParams class just describes how big the view wants to be 4285 * for both width and height. For each dimension, it can specify one of: 4286 * <ul> 4287 * <li>FILL_PARENT (renamed MATCH_PARENT in API Level 8 and higher), which 4288 * means that the view wants to be as big as its parent (minus padding) 4289 * <li> WRAP_CONTENT, which means that the view wants to be just big enough 4290 * to enclose its content (plus padding) 4291 * <li> an exact number 4292 * </ul> 4293 * There are subclasses of LayoutParams for different subclasses of 4294 * ViewGroup. For example, AbsoluteLayout has its own subclass of 4295 * LayoutParams which adds an X and Y value. 4296 * 4297 * @attr ref android.R.styleable#ViewGroup_Layout_layout_height 4298 * @attr ref android.R.styleable#ViewGroup_Layout_layout_width 4299 */ 4300 public static class LayoutParams { 4301 /** 4302 * Special value for the height or width requested by a View. 4303 * FILL_PARENT means that the view wants to be as big as its parent, 4304 * minus the parent's padding, if any. This value is deprecated 4305 * starting in API Level 8 and replaced by {@link #MATCH_PARENT}. 4306 */ 4307 @SuppressWarnings({"UnusedDeclaration"}) 4308 @Deprecated 4309 public static final int FILL_PARENT = -1; 4310 4311 /** 4312 * Special value for the height or width requested by a View. 4313 * MATCH_PARENT means that the view wants to be as big as its parent, 4314 * minus the parent's padding, if any. Introduced in API Level 8. 4315 */ 4316 public static final int MATCH_PARENT = -1; 4317 4318 /** 4319 * Special value for the height or width requested by a View. 4320 * WRAP_CONTENT means that the view wants to be just large enough to fit 4321 * its own internal content, taking its own padding into account. 4322 */ 4323 public static final int WRAP_CONTENT = -2; 4324 4325 /** 4326 * Information about how wide the view wants to be. Can be one of the 4327 * constants FILL_PARENT (replaced by MATCH_PARENT , 4328 * in API Level 8) or WRAP_CONTENT. or an exact size. 4329 */ 4330 @ViewDebug.ExportedProperty(category = "layout", mapping = { 4331 @ViewDebug.IntToString(from = MATCH_PARENT, to = "MATCH_PARENT"), 4332 @ViewDebug.IntToString(from = WRAP_CONTENT, to = "WRAP_CONTENT") 4333 }) 4334 public int width; 4335 4336 /** 4337 * Information about how tall the view wants to be. Can be one of the 4338 * constants FILL_PARENT (replaced by MATCH_PARENT , 4339 * in API Level 8) or WRAP_CONTENT. or an exact size. 4340 */ 4341 @ViewDebug.ExportedProperty(category = "layout", mapping = { 4342 @ViewDebug.IntToString(from = MATCH_PARENT, to = "MATCH_PARENT"), 4343 @ViewDebug.IntToString(from = WRAP_CONTENT, to = "WRAP_CONTENT") 4344 }) 4345 public int height; 4346 4347 /** 4348 * Used to animate layouts. 4349 */ 4350 public LayoutAnimationController.AnimationParameters layoutAnimationParameters; 4351 4352 /** 4353 * Creates a new set of layout parameters. The values are extracted from 4354 * the supplied attributes set and context. The XML attributes mapped 4355 * to this set of layout parameters are: 4356 * 4357 * <ul> 4358 * <li><code>layout_width</code>: the width, either an exact value, 4359 * {@link #WRAP_CONTENT}, or {@link #FILL_PARENT} (replaced by 4360 * {@link #MATCH_PARENT} in API Level 8)</li> 4361 * <li><code>layout_height</code>: the height, either an exact value, 4362 * {@link #WRAP_CONTENT}, or {@link #FILL_PARENT} (replaced by 4363 * {@link #MATCH_PARENT} in API Level 8)</li> 4364 * </ul> 4365 * 4366 * @param c the application environment 4367 * @param attrs the set of attributes from which to extract the layout 4368 * parameters' values 4369 */ 4370 public LayoutParams(Context c, AttributeSet attrs) { 4371 TypedArray a = c.obtainStyledAttributes(attrs, R.styleable.ViewGroup_Layout); 4372 setBaseAttributes(a, 4373 R.styleable.ViewGroup_Layout_layout_width, 4374 R.styleable.ViewGroup_Layout_layout_height); 4375 a.recycle(); 4376 } 4377 4378 /** 4379 * Creates a new set of layout parameters with the specified width 4380 * and height. 4381 * 4382 * @param width the width, either {@link #WRAP_CONTENT}, 4383 * {@link #FILL_PARENT} (replaced by {@link #MATCH_PARENT} in 4384 * API Level 8), or a fixed size in pixels 4385 * @param height the height, either {@link #WRAP_CONTENT}, 4386 * {@link #FILL_PARENT} (replaced by {@link #MATCH_PARENT} in 4387 * API Level 8), or a fixed size in pixels 4388 */ 4389 public LayoutParams(int width, int height) { 4390 this.width = width; 4391 this.height = height; 4392 } 4393 4394 /** 4395 * Copy constructor. Clones the width and height values of the source. 4396 * 4397 * @param source The layout params to copy from. 4398 */ 4399 public LayoutParams(LayoutParams source) { 4400 this.width = source.width; 4401 this.height = source.height; 4402 } 4403 4404 /** 4405 * Used internally by MarginLayoutParams. 4406 * @hide 4407 */ 4408 LayoutParams() { 4409 } 4410 4411 /** 4412 * Extracts the layout parameters from the supplied attributes. 4413 * 4414 * @param a the style attributes to extract the parameters from 4415 * @param widthAttr the identifier of the width attribute 4416 * @param heightAttr the identifier of the height attribute 4417 */ 4418 protected void setBaseAttributes(TypedArray a, int widthAttr, int heightAttr) { 4419 width = a.getLayoutDimension(widthAttr, "layout_width"); 4420 height = a.getLayoutDimension(heightAttr, "layout_height"); 4421 } 4422 4423 /** 4424 * Returns a String representation of this set of layout parameters. 4425 * 4426 * @param output the String to prepend to the internal representation 4427 * @return a String with the following format: output + 4428 * "ViewGroup.LayoutParams={ width=WIDTH, height=HEIGHT }" 4429 * 4430 * @hide 4431 */ 4432 public String debug(String output) { 4433 return output + "ViewGroup.LayoutParams={ width=" 4434 + sizeToString(width) + ", height=" + sizeToString(height) + " }"; 4435 } 4436 4437 /** 4438 * Converts the specified size to a readable String. 4439 * 4440 * @param size the size to convert 4441 * @return a String instance representing the supplied size 4442 * 4443 * @hide 4444 */ 4445 protected static String sizeToString(int size) { 4446 if (size == WRAP_CONTENT) { 4447 return "wrap-content"; 4448 } 4449 if (size == MATCH_PARENT) { 4450 return "match-parent"; 4451 } 4452 return String.valueOf(size); 4453 } 4454 } 4455 4456 /** 4457 * Per-child layout information for layouts that support margins. 4458 * See 4459 * {@link android.R.styleable#ViewGroup_MarginLayout ViewGroup Margin Layout Attributes} 4460 * for a list of all child view attributes that this class supports. 4461 */ 4462 public static class MarginLayoutParams extends ViewGroup.LayoutParams { 4463 /** 4464 * The left margin in pixels of the child. 4465 */ 4466 @ViewDebug.ExportedProperty(category = "layout") 4467 public int leftMargin; 4468 4469 /** 4470 * The top margin in pixels of the child. 4471 */ 4472 @ViewDebug.ExportedProperty(category = "layout") 4473 public int topMargin; 4474 4475 /** 4476 * The right margin in pixels of the child. 4477 */ 4478 @ViewDebug.ExportedProperty(category = "layout") 4479 public int rightMargin; 4480 4481 /** 4482 * The bottom margin in pixels of the child. 4483 */ 4484 @ViewDebug.ExportedProperty(category = "layout") 4485 public int bottomMargin; 4486 4487 /** 4488 * Creates a new set of layout parameters. The values are extracted from 4489 * the supplied attributes set and context. 4490 * 4491 * @param c the application environment 4492 * @param attrs the set of attributes from which to extract the layout 4493 * parameters' values 4494 */ 4495 public MarginLayoutParams(Context c, AttributeSet attrs) { 4496 super(); 4497 4498 TypedArray a = c.obtainStyledAttributes(attrs, R.styleable.ViewGroup_MarginLayout); 4499 setBaseAttributes(a, 4500 R.styleable.ViewGroup_MarginLayout_layout_width, 4501 R.styleable.ViewGroup_MarginLayout_layout_height); 4502 4503 int margin = a.getDimensionPixelSize( 4504 com.android.internal.R.styleable.ViewGroup_MarginLayout_layout_margin, -1); 4505 if (margin >= 0) { 4506 leftMargin = margin; 4507 topMargin = margin; 4508 rightMargin= margin; 4509 bottomMargin = margin; 4510 } else { 4511 leftMargin = a.getDimensionPixelSize( 4512 R.styleable.ViewGroup_MarginLayout_layout_marginLeft, 0); 4513 topMargin = a.getDimensionPixelSize( 4514 R.styleable.ViewGroup_MarginLayout_layout_marginTop, 0); 4515 rightMargin = a.getDimensionPixelSize( 4516 R.styleable.ViewGroup_MarginLayout_layout_marginRight, 0); 4517 bottomMargin = a.getDimensionPixelSize( 4518 R.styleable.ViewGroup_MarginLayout_layout_marginBottom, 0); 4519 } 4520 4521 a.recycle(); 4522 } 4523 4524 /** 4525 * {@inheritDoc} 4526 */ 4527 public MarginLayoutParams(int width, int height) { 4528 super(width, height); 4529 } 4530 4531 /** 4532 * Copy constructor. Clones the width, height and margin values of the source. 4533 * 4534 * @param source The layout params to copy from. 4535 */ 4536 public MarginLayoutParams(MarginLayoutParams source) { 4537 this.width = source.width; 4538 this.height = source.height; 4539 4540 this.leftMargin = source.leftMargin; 4541 this.topMargin = source.topMargin; 4542 this.rightMargin = source.rightMargin; 4543 this.bottomMargin = source.bottomMargin; 4544 } 4545 4546 /** 4547 * {@inheritDoc} 4548 */ 4549 public MarginLayoutParams(LayoutParams source) { 4550 super(source); 4551 } 4552 4553 /** 4554 * Sets the margins, in pixels. 4555 * 4556 * @param left the left margin size 4557 * @param top the top margin size 4558 * @param right the right margin size 4559 * @param bottom the bottom margin size 4560 * 4561 * @attr ref android.R.styleable#ViewGroup_MarginLayout_layout_marginLeft 4562 * @attr ref android.R.styleable#ViewGroup_MarginLayout_layout_marginTop 4563 * @attr ref android.R.styleable#ViewGroup_MarginLayout_layout_marginRight 4564 * @attr ref android.R.styleable#ViewGroup_MarginLayout_layout_marginBottom 4565 */ 4566 public void setMargins(int left, int top, int right, int bottom) { 4567 leftMargin = left; 4568 topMargin = top; 4569 rightMargin = right; 4570 bottomMargin = bottom; 4571 } 4572 } 4573 4574 /* Describes a touched view and the ids of the pointers that it has captured. 4575 * 4576 * This code assumes that pointer ids are always in the range 0..31 such that 4577 * it can use a bitfield to track which pointer ids are present. 4578 * As it happens, the lower layers of the input dispatch pipeline also use the 4579 * same trick so the assumption should be safe here... 4580 */ 4581 private static final class TouchTarget { 4582 private static final int MAX_RECYCLED = 32; 4583 private static final Object sRecycleLock = new Object(); 4584 private static TouchTarget sRecycleBin; 4585 private static int sRecycledCount; 4586 4587 public static final int ALL_POINTER_IDS = -1; // all ones 4588 4589 // The touched child view. 4590 public View child; 4591 4592 // The combined bit mask of pointer ids for all pointers captured by the target. 4593 public int pointerIdBits; 4594 4595 // The next target in the target list. 4596 public TouchTarget next; 4597 4598 private TouchTarget() { 4599 } 4600 4601 public static TouchTarget obtain(View child, int pointerIdBits) { 4602 final TouchTarget target; 4603 synchronized (sRecycleLock) { 4604 if (sRecycleBin == null) { 4605 target = new TouchTarget(); 4606 } else { 4607 target = sRecycleBin; 4608 sRecycleBin = target.next; 4609 sRecycledCount--; 4610 target.next = null; 4611 } 4612 } 4613 target.child = child; 4614 target.pointerIdBits = pointerIdBits; 4615 return target; 4616 } 4617 4618 public void recycle() { 4619 synchronized (sRecycleLock) { 4620 if (sRecycledCount < MAX_RECYCLED) { 4621 next = sRecycleBin; 4622 sRecycleBin = this; 4623 sRecycledCount += 1; 4624 } 4625 } 4626 } 4627 } 4628} 4629