ViewGroup.java revision 2c095f367779ef32130c72849936a2e3013c8492
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.ClipData; 23import android.content.ClipDescription; 24import android.content.Context; 25import android.content.res.Configuration; 26import android.content.res.TypedArray; 27import android.graphics.Bitmap; 28import android.graphics.Canvas; 29import android.graphics.Matrix; 30import android.graphics.Paint; 31import android.graphics.PointF; 32import android.graphics.Rect; 33import android.graphics.RectF; 34import android.graphics.Region; 35import android.os.Parcelable; 36import android.os.SystemClock; 37import android.util.AttributeSet; 38import android.util.Log; 39import android.util.SparseArray; 40import android.view.accessibility.AccessibilityEvent; 41import android.view.animation.Animation; 42import android.view.animation.AnimationUtils; 43import android.view.animation.LayoutAnimationController; 44import android.view.animation.Transformation; 45 46import java.util.ArrayList; 47 48/** 49 * <p> 50 * A <code>ViewGroup</code> is a special view that can contain other views 51 * (called children.) The view group is the base class for layouts and views 52 * containers. This class also defines the 53 * {@link android.view.ViewGroup.LayoutParams} class which serves as the base 54 * class for layouts parameters. 55 * </p> 56 * 57 * <p> 58 * Also see {@link LayoutParams} for layout attributes. 59 * </p> 60 * 61 * @attr ref android.R.styleable#ViewGroup_clipChildren 62 * @attr ref android.R.styleable#ViewGroup_clipToPadding 63 * @attr ref android.R.styleable#ViewGroup_layoutAnimation 64 * @attr ref android.R.styleable#ViewGroup_animationCache 65 * @attr ref android.R.styleable#ViewGroup_persistentDrawingCache 66 * @attr ref android.R.styleable#ViewGroup_alwaysDrawnWithCache 67 * @attr ref android.R.styleable#ViewGroup_addStatesFromChildren 68 * @attr ref android.R.styleable#ViewGroup_descendantFocusability 69 * @attr ref android.R.styleable#ViewGroup_animateLayoutChanges 70 */ 71public abstract class ViewGroup extends View implements ViewParent, ViewManager { 72 73 private static final boolean DBG = false; 74 75 /** 76 * Views which have been hidden or removed which need to be animated on 77 * their way out. 78 * This field should be made private, so it is hidden from the SDK. 79 * {@hide} 80 */ 81 protected ArrayList<View> mDisappearingChildren; 82 83 /** 84 * Listener used to propagate events indicating when children are added 85 * and/or removed from a view group. 86 * This field should be made private, so it is hidden from the SDK. 87 * {@hide} 88 */ 89 protected OnHierarchyChangeListener mOnHierarchyChangeListener; 90 91 // The view contained within this ViewGroup that has or contains focus. 92 private View mFocused; 93 94 /** 95 * A Transformation used when drawing children, to 96 * apply on the child being drawn. 97 */ 98 private final Transformation mChildTransformation = new Transformation(); 99 100 /** 101 * Used to track the current invalidation region. 102 */ 103 private RectF mInvalidateRegion; 104 105 /** 106 * A Transformation used to calculate a correct 107 * invalidation area when the application is autoscaled. 108 */ 109 private Transformation mInvalidationTransformation; 110 111 // View currently under an ongoing drag 112 private View mCurrentDragView; 113 114 // Does this group have a child that can accept the current drag payload? 115 private boolean mChildAcceptsDrag; 116 117 // Used during drag dispatch 118 private final PointF mLocalPoint = new PointF(); 119 120 // Layout animation 121 private LayoutAnimationController mLayoutAnimationController; 122 private Animation.AnimationListener mAnimationListener; 123 124 // First touch target in the linked list of touch targets. 125 private TouchTarget mFirstTouchTarget; 126 127 // Temporary arrays for splitting pointers. 128 private int[] mTmpPointerIndexMap; 129 private int[] mTmpPointerIds; 130 private MotionEvent.PointerCoords[] mTmpPointerCoords; 131 132 /** 133 * Internal flags. 134 * 135 * This field should be made private, so it is hidden from the SDK. 136 * {@hide} 137 */ 138 protected int mGroupFlags; 139 140 // When set, ViewGroup invalidates only the child's rectangle 141 // Set by default 142 private static final int FLAG_CLIP_CHILDREN = 0x1; 143 144 // When set, ViewGroup excludes the padding area from the invalidate rectangle 145 // Set by default 146 private static final int FLAG_CLIP_TO_PADDING = 0x2; 147 148 // When set, dispatchDraw() will invoke invalidate(); this is set by drawChild() when 149 // a child needs to be invalidated and FLAG_OPTIMIZE_INVALIDATE is set 150 private static final int FLAG_INVALIDATE_REQUIRED = 0x4; 151 152 // When set, dispatchDraw() will run the layout animation and unset the flag 153 private static final int FLAG_RUN_ANIMATION = 0x8; 154 155 // When set, there is either no layout animation on the ViewGroup or the layout 156 // animation is over 157 // Set by default 158 private static final int FLAG_ANIMATION_DONE = 0x10; 159 160 // If set, this ViewGroup has padding; if unset there is no padding and we don't need 161 // to clip it, even if FLAG_CLIP_TO_PADDING is set 162 private static final int FLAG_PADDING_NOT_NULL = 0x20; 163 164 // When set, this ViewGroup caches its children in a Bitmap before starting a layout animation 165 // Set by default 166 private static final int FLAG_ANIMATION_CACHE = 0x40; 167 168 // When set, this ViewGroup converts calls to invalidate(Rect) to invalidate() during a 169 // layout animation; this avoid clobbering the hierarchy 170 // Automatically set when the layout animation starts, depending on the animation's 171 // characteristics 172 private static final int FLAG_OPTIMIZE_INVALIDATE = 0x80; 173 174 // When set, the next call to drawChild() will clear mChildTransformation's matrix 175 private static final int FLAG_CLEAR_TRANSFORMATION = 0x100; 176 177 // When set, this ViewGroup invokes mAnimationListener.onAnimationEnd() and removes 178 // the children's Bitmap caches if necessary 179 // This flag is set when the layout animation is over (after FLAG_ANIMATION_DONE is set) 180 private static final int FLAG_NOTIFY_ANIMATION_LISTENER = 0x200; 181 182 /** 183 * When set, the drawing method will call {@link #getChildDrawingOrder(int, int)} 184 * to get the index of the child to draw for that iteration. 185 * 186 * @hide 187 */ 188 protected static final int FLAG_USE_CHILD_DRAWING_ORDER = 0x400; 189 190 /** 191 * When set, this ViewGroup supports static transformations on children; this causes 192 * {@link #getChildStaticTransformation(View, android.view.animation.Transformation)} to be 193 * invoked when a child is drawn. 194 * 195 * Any subclass overriding 196 * {@link #getChildStaticTransformation(View, android.view.animation.Transformation)} should 197 * set this flags in {@link #mGroupFlags}. 198 * 199 * {@hide} 200 */ 201 protected static final int FLAG_SUPPORT_STATIC_TRANSFORMATIONS = 0x800; 202 203 // When the previous drawChild() invocation used an alpha value that was lower than 204 // 1.0 and set it in mCachePaint 205 private static final int FLAG_ALPHA_LOWER_THAN_ONE = 0x1000; 206 207 /** 208 * When set, this ViewGroup's drawable states also include those 209 * of its children. 210 */ 211 private static final int FLAG_ADD_STATES_FROM_CHILDREN = 0x2000; 212 213 /** 214 * When set, this ViewGroup tries to always draw its children using their drawing cache. 215 */ 216 private static final int FLAG_ALWAYS_DRAWN_WITH_CACHE = 0x4000; 217 218 /** 219 * When set, and if FLAG_ALWAYS_DRAWN_WITH_CACHE is not set, this ViewGroup will try to 220 * draw its children with their drawing cache. 221 */ 222 private static final int FLAG_CHILDREN_DRAWN_WITH_CACHE = 0x8000; 223 224 /** 225 * When set, this group will go through its list of children to notify them of 226 * any drawable state change. 227 */ 228 private static final int FLAG_NOTIFY_CHILDREN_ON_DRAWABLE_STATE_CHANGE = 0x10000; 229 230 private static final int FLAG_MASK_FOCUSABILITY = 0x60000; 231 232 /** 233 * This view will get focus before any of its descendants. 234 */ 235 public static final int FOCUS_BEFORE_DESCENDANTS = 0x20000; 236 237 /** 238 * This view will get focus only if none of its descendants want it. 239 */ 240 public static final int FOCUS_AFTER_DESCENDANTS = 0x40000; 241 242 /** 243 * This view will block any of its descendants from getting focus, even 244 * if they are focusable. 245 */ 246 public static final int FOCUS_BLOCK_DESCENDANTS = 0x60000; 247 248 /** 249 * Used to map between enum in attrubutes and flag values. 250 */ 251 private static final int[] DESCENDANT_FOCUSABILITY_FLAGS = 252 {FOCUS_BEFORE_DESCENDANTS, FOCUS_AFTER_DESCENDANTS, 253 FOCUS_BLOCK_DESCENDANTS}; 254 255 /** 256 * When set, this ViewGroup should not intercept touch events. 257 * {@hide} 258 */ 259 protected static final int FLAG_DISALLOW_INTERCEPT = 0x80000; 260 261 /** 262 * When set, this ViewGroup will split MotionEvents to multiple child Views when appropriate. 263 */ 264 private static final int FLAG_SPLIT_MOTION_EVENTS = 0x200000; 265 266 /** 267 * Indicates which types of drawing caches are to be kept in memory. 268 * This field should be made private, so it is hidden from the SDK. 269 * {@hide} 270 */ 271 protected int mPersistentDrawingCache; 272 273 /** 274 * Used to indicate that no drawing cache should be kept in memory. 275 */ 276 public static final int PERSISTENT_NO_CACHE = 0x0; 277 278 /** 279 * Used to indicate that the animation drawing cache should be kept in memory. 280 */ 281 public static final int PERSISTENT_ANIMATION_CACHE = 0x1; 282 283 /** 284 * Used to indicate that the scrolling drawing cache should be kept in memory. 285 */ 286 public static final int PERSISTENT_SCROLLING_CACHE = 0x2; 287 288 /** 289 * Used to indicate that all drawing caches should be kept in memory. 290 */ 291 public static final int PERSISTENT_ALL_CACHES = 0x3; 292 293 /** 294 * We clip to padding when FLAG_CLIP_TO_PADDING and FLAG_PADDING_NOT_NULL 295 * are set at the same time. 296 */ 297 protected static final int CLIP_TO_PADDING_MASK = FLAG_CLIP_TO_PADDING | FLAG_PADDING_NOT_NULL; 298 299 // Index of the child's left position in the mLocation array 300 private static final int CHILD_LEFT_INDEX = 0; 301 // Index of the child's top position in the mLocation array 302 private static final int CHILD_TOP_INDEX = 1; 303 304 // Child views of this ViewGroup 305 private View[] mChildren; 306 // Number of valid children in the mChildren array, the rest should be null or not 307 // considered as children 308 private int mChildrenCount; 309 310 private static final int ARRAY_INITIAL_CAPACITY = 12; 311 private static final int ARRAY_CAPACITY_INCREMENT = 12; 312 313 // Used to draw cached views 314 private final Paint mCachePaint = new Paint(); 315 316 // Used to animate add/remove changes in layout 317 private LayoutTransition mTransition; 318 319 // The set of views that are currently being transitioned. This list is used to track views 320 // being removed that should not actually be removed from the parent yet because they are 321 // being animated. 322 private ArrayList<View> mTransitioningViews; 323 324 // List of children changing visibility. This is used to potentially keep rendering 325 // views during a transition when they otherwise would have become gone/invisible 326 private ArrayList<View> mVisibilityChangingChildren; 327 328 public ViewGroup(Context context) { 329 super(context); 330 initViewGroup(); 331 } 332 333 public ViewGroup(Context context, AttributeSet attrs) { 334 super(context, attrs); 335 initViewGroup(); 336 initFromAttributes(context, attrs); 337 } 338 339 public ViewGroup(Context context, AttributeSet attrs, int defStyle) { 340 super(context, attrs, defStyle); 341 initViewGroup(); 342 initFromAttributes(context, attrs); 343 } 344 345 private void initViewGroup() { 346 // ViewGroup doesn't draw by default 347 setFlags(WILL_NOT_DRAW, DRAW_MASK); 348 mGroupFlags |= FLAG_CLIP_CHILDREN; 349 mGroupFlags |= FLAG_CLIP_TO_PADDING; 350 mGroupFlags |= FLAG_ANIMATION_DONE; 351 mGroupFlags |= FLAG_ANIMATION_CACHE; 352 mGroupFlags |= FLAG_ALWAYS_DRAWN_WITH_CACHE; 353 354 setDescendantFocusability(FOCUS_BEFORE_DESCENDANTS); 355 356 mChildren = new View[ARRAY_INITIAL_CAPACITY]; 357 mChildrenCount = 0; 358 359 mCachePaint.setDither(false); 360 361 mPersistentDrawingCache = PERSISTENT_SCROLLING_CACHE; 362 } 363 364 private void initFromAttributes(Context context, AttributeSet attrs) { 365 TypedArray a = context.obtainStyledAttributes(attrs, 366 R.styleable.ViewGroup); 367 368 final int N = a.getIndexCount(); 369 for (int i = 0; i < N; i++) { 370 int attr = a.getIndex(i); 371 switch (attr) { 372 case R.styleable.ViewGroup_clipChildren: 373 setClipChildren(a.getBoolean(attr, true)); 374 break; 375 case R.styleable.ViewGroup_clipToPadding: 376 setClipToPadding(a.getBoolean(attr, true)); 377 break; 378 case R.styleable.ViewGroup_animationCache: 379 setAnimationCacheEnabled(a.getBoolean(attr, true)); 380 break; 381 case R.styleable.ViewGroup_persistentDrawingCache: 382 setPersistentDrawingCache(a.getInt(attr, PERSISTENT_SCROLLING_CACHE)); 383 break; 384 case R.styleable.ViewGroup_addStatesFromChildren: 385 setAddStatesFromChildren(a.getBoolean(attr, false)); 386 break; 387 case R.styleable.ViewGroup_alwaysDrawnWithCache: 388 setAlwaysDrawnWithCacheEnabled(a.getBoolean(attr, true)); 389 break; 390 case R.styleable.ViewGroup_layoutAnimation: 391 int id = a.getResourceId(attr, -1); 392 if (id > 0) { 393 setLayoutAnimation(AnimationUtils.loadLayoutAnimation(mContext, id)); 394 } 395 break; 396 case R.styleable.ViewGroup_descendantFocusability: 397 setDescendantFocusability(DESCENDANT_FOCUSABILITY_FLAGS[a.getInt(attr, 0)]); 398 break; 399 case R.styleable.ViewGroup_splitMotionEvents: 400 setMotionEventSplittingEnabled(a.getBoolean(attr, false)); 401 break; 402 case R.styleable.ViewGroup_animateLayoutChanges: 403 boolean animateLayoutChanges = a.getBoolean(attr, false); 404 if (animateLayoutChanges) { 405 setLayoutTransition(new LayoutTransition()); 406 } 407 break; 408 } 409 } 410 411 a.recycle(); 412 } 413 414 /** 415 * Gets the descendant focusability of this view group. The descendant 416 * focusability defines the relationship between this view group and its 417 * descendants when looking for a view to take focus in 418 * {@link #requestFocus(int, android.graphics.Rect)}. 419 * 420 * @return one of {@link #FOCUS_BEFORE_DESCENDANTS}, {@link #FOCUS_AFTER_DESCENDANTS}, 421 * {@link #FOCUS_BLOCK_DESCENDANTS}. 422 */ 423 @ViewDebug.ExportedProperty(category = "focus", mapping = { 424 @ViewDebug.IntToString(from = FOCUS_BEFORE_DESCENDANTS, to = "FOCUS_BEFORE_DESCENDANTS"), 425 @ViewDebug.IntToString(from = FOCUS_AFTER_DESCENDANTS, to = "FOCUS_AFTER_DESCENDANTS"), 426 @ViewDebug.IntToString(from = FOCUS_BLOCK_DESCENDANTS, to = "FOCUS_BLOCK_DESCENDANTS") 427 }) 428 public int getDescendantFocusability() { 429 return mGroupFlags & FLAG_MASK_FOCUSABILITY; 430 } 431 432 /** 433 * Set the descendant focusability of this view group. This defines the relationship 434 * between this view group and its descendants when looking for a view to 435 * take focus in {@link #requestFocus(int, android.graphics.Rect)}. 436 * 437 * @param focusability one of {@link #FOCUS_BEFORE_DESCENDANTS}, {@link #FOCUS_AFTER_DESCENDANTS}, 438 * {@link #FOCUS_BLOCK_DESCENDANTS}. 439 */ 440 public void setDescendantFocusability(int focusability) { 441 switch (focusability) { 442 case FOCUS_BEFORE_DESCENDANTS: 443 case FOCUS_AFTER_DESCENDANTS: 444 case FOCUS_BLOCK_DESCENDANTS: 445 break; 446 default: 447 throw new IllegalArgumentException("must be one of FOCUS_BEFORE_DESCENDANTS, " 448 + "FOCUS_AFTER_DESCENDANTS, FOCUS_BLOCK_DESCENDANTS"); 449 } 450 mGroupFlags &= ~FLAG_MASK_FOCUSABILITY; 451 mGroupFlags |= (focusability & FLAG_MASK_FOCUSABILITY); 452 } 453 454 /** 455 * {@inheritDoc} 456 */ 457 @Override 458 void handleFocusGainInternal(int direction, Rect previouslyFocusedRect) { 459 if (mFocused != null) { 460 mFocused.unFocus(); 461 mFocused = null; 462 } 463 super.handleFocusGainInternal(direction, previouslyFocusedRect); 464 } 465 466 /** 467 * {@inheritDoc} 468 */ 469 public void requestChildFocus(View child, View focused) { 470 if (DBG) { 471 System.out.println(this + " requestChildFocus()"); 472 } 473 if (getDescendantFocusability() == FOCUS_BLOCK_DESCENDANTS) { 474 return; 475 } 476 477 // Unfocus us, if necessary 478 super.unFocus(); 479 480 // We had a previous notion of who had focus. Clear it. 481 if (mFocused != child) { 482 if (mFocused != null) { 483 mFocused.unFocus(); 484 } 485 486 mFocused = child; 487 } 488 if (mParent != null) { 489 mParent.requestChildFocus(this, focused); 490 } 491 } 492 493 /** 494 * {@inheritDoc} 495 */ 496 public void focusableViewAvailable(View v) { 497 if (mParent != null 498 // shortcut: don't report a new focusable view if we block our descendants from 499 // getting focus 500 && (getDescendantFocusability() != FOCUS_BLOCK_DESCENDANTS) 501 // shortcut: don't report a new focusable view if we already are focused 502 // (and we don't prefer our descendants) 503 // 504 // note: knowing that mFocused is non-null is not a good enough reason 505 // to break the traversal since in that case we'd actually have to find 506 // the focused view and make sure it wasn't FOCUS_AFTER_DESCENDANTS and 507 // an ancestor of v; this will get checked for at ViewRoot 508 && !(isFocused() && getDescendantFocusability() != FOCUS_AFTER_DESCENDANTS)) { 509 mParent.focusableViewAvailable(v); 510 } 511 } 512 513 /** 514 * {@inheritDoc} 515 */ 516 public boolean showContextMenuForChild(View originalView) { 517 return mParent != null && mParent.showContextMenuForChild(originalView); 518 } 519 520 /** 521 * {@inheritDoc} 522 */ 523 public ActionMode startActionModeForChild(View originalView, ActionMode.Callback callback) { 524 return mParent != null ? mParent.startActionModeForChild(originalView, callback) : null; 525 } 526 527 /** 528 * Find the nearest view in the specified direction that wants to take 529 * focus. 530 * 531 * @param focused The view that currently has focus 532 * @param direction One of FOCUS_UP, FOCUS_DOWN, FOCUS_LEFT, and 533 * FOCUS_RIGHT, or 0 for not applicable. 534 */ 535 public View focusSearch(View focused, int direction) { 536 if (isRootNamespace()) { 537 // root namespace means we should consider ourselves the top of the 538 // tree for focus searching; otherwise we could be focus searching 539 // into other tabs. see LocalActivityManager and TabHost for more info 540 return FocusFinder.getInstance().findNextFocus(this, focused, direction); 541 } else if (mParent != null) { 542 return mParent.focusSearch(focused, direction); 543 } 544 return null; 545 } 546 547 /** 548 * {@inheritDoc} 549 */ 550 public boolean requestChildRectangleOnScreen(View child, Rect rectangle, boolean immediate) { 551 return false; 552 } 553 554 /** 555 * {@inheritDoc} 556 */ 557 @Override 558 public boolean dispatchUnhandledMove(View focused, int direction) { 559 return mFocused != null && 560 mFocused.dispatchUnhandledMove(focused, direction); 561 } 562 563 /** 564 * {@inheritDoc} 565 */ 566 public void clearChildFocus(View child) { 567 if (DBG) { 568 System.out.println(this + " clearChildFocus()"); 569 } 570 571 mFocused = null; 572 if (mParent != null) { 573 mParent.clearChildFocus(this); 574 } 575 } 576 577 /** 578 * {@inheritDoc} 579 */ 580 @Override 581 public void clearFocus() { 582 super.clearFocus(); 583 584 // clear any child focus if it exists 585 if (mFocused != null) { 586 mFocused.clearFocus(); 587 } 588 } 589 590 /** 591 * {@inheritDoc} 592 */ 593 @Override 594 void unFocus() { 595 if (DBG) { 596 System.out.println(this + " unFocus()"); 597 } 598 599 super.unFocus(); 600 if (mFocused != null) { 601 mFocused.unFocus(); 602 } 603 mFocused = null; 604 } 605 606 /** 607 * Returns the focused child of this view, if any. The child may have focus 608 * or contain focus. 609 * 610 * @return the focused child or null. 611 */ 612 public View getFocusedChild() { 613 return mFocused; 614 } 615 616 /** 617 * Returns true if this view has or contains focus 618 * 619 * @return true if this view has or contains focus 620 */ 621 @Override 622 public boolean hasFocus() { 623 return (mPrivateFlags & FOCUSED) != 0 || mFocused != null; 624 } 625 626 /* 627 * (non-Javadoc) 628 * 629 * @see android.view.View#findFocus() 630 */ 631 @Override 632 public View findFocus() { 633 if (DBG) { 634 System.out.println("Find focus in " + this + ": flags=" 635 + isFocused() + ", child=" + mFocused); 636 } 637 638 if (isFocused()) { 639 return this; 640 } 641 642 if (mFocused != null) { 643 return mFocused.findFocus(); 644 } 645 return null; 646 } 647 648 /** 649 * {@inheritDoc} 650 */ 651 @Override 652 public boolean hasFocusable() { 653 if ((mViewFlags & VISIBILITY_MASK) != VISIBLE) { 654 return false; 655 } 656 657 if (isFocusable()) { 658 return true; 659 } 660 661 final int descendantFocusability = getDescendantFocusability(); 662 if (descendantFocusability != FOCUS_BLOCK_DESCENDANTS) { 663 final int count = mChildrenCount; 664 final View[] children = mChildren; 665 666 for (int i = 0; i < count; i++) { 667 final View child = children[i]; 668 if (child.hasFocusable()) { 669 return true; 670 } 671 } 672 } 673 674 return false; 675 } 676 677 /** 678 * {@inheritDoc} 679 */ 680 @Override 681 public void addFocusables(ArrayList<View> views, int direction) { 682 addFocusables(views, direction, FOCUSABLES_TOUCH_MODE); 683 } 684 685 /** 686 * {@inheritDoc} 687 */ 688 @Override 689 public void addFocusables(ArrayList<View> views, int direction, int focusableMode) { 690 final int focusableCount = views.size(); 691 692 final int descendantFocusability = getDescendantFocusability(); 693 694 if (descendantFocusability != FOCUS_BLOCK_DESCENDANTS) { 695 final int count = mChildrenCount; 696 final View[] children = mChildren; 697 698 for (int i = 0; i < count; i++) { 699 final View child = children[i]; 700 if ((child.mViewFlags & VISIBILITY_MASK) == VISIBLE) { 701 child.addFocusables(views, direction, focusableMode); 702 } 703 } 704 } 705 706 // we add ourselves (if focusable) in all cases except for when we are 707 // FOCUS_AFTER_DESCENDANTS and there are some descendants focusable. this is 708 // to avoid the focus search finding layouts when a more precise search 709 // among the focusable children would be more interesting. 710 if ( 711 descendantFocusability != FOCUS_AFTER_DESCENDANTS || 712 // No focusable descendants 713 (focusableCount == views.size())) { 714 super.addFocusables(views, direction, focusableMode); 715 } 716 } 717 718 /** 719 * {@inheritDoc} 720 */ 721 @Override 722 public void dispatchWindowFocusChanged(boolean hasFocus) { 723 super.dispatchWindowFocusChanged(hasFocus); 724 final int count = mChildrenCount; 725 final View[] children = mChildren; 726 for (int i = 0; i < count; i++) { 727 children[i].dispatchWindowFocusChanged(hasFocus); 728 } 729 } 730 731 /** 732 * {@inheritDoc} 733 */ 734 @Override 735 public void addTouchables(ArrayList<View> views) { 736 super.addTouchables(views); 737 738 final int count = mChildrenCount; 739 final View[] children = mChildren; 740 741 for (int i = 0; i < count; i++) { 742 final View child = children[i]; 743 if ((child.mViewFlags & VISIBILITY_MASK) == VISIBLE) { 744 child.addTouchables(views); 745 } 746 } 747 } 748 749 /** 750 * {@inheritDoc} 751 */ 752 @Override 753 public void dispatchDisplayHint(int hint) { 754 super.dispatchDisplayHint(hint); 755 final int count = mChildrenCount; 756 final View[] children = mChildren; 757 for (int i = 0; i < count; i++) { 758 children[i].dispatchDisplayHint(hint); 759 } 760 } 761 762 /** 763 * @hide 764 * @param child 765 * @param visibility 766 */ 767 void onChildVisibilityChanged(View child, int visibility) { 768 if (mTransition != null) { 769 if (visibility == VISIBLE) { 770 mTransition.showChild(this, child); 771 } else { 772 mTransition.hideChild(this, child); 773 } 774 if (visibility != VISIBLE) { 775 // Only track this on disappearing views - appearing views are already visible 776 // and don't need special handling during drawChild() 777 if (mVisibilityChangingChildren == null) { 778 mVisibilityChangingChildren = new ArrayList<View>(); 779 } 780 mVisibilityChangingChildren.add(child); 781 if (mTransitioningViews != null && mTransitioningViews.contains(child)) { 782 addDisappearingView(child); 783 } 784 } 785 } 786 } 787 788 /** 789 * {@inheritDoc} 790 */ 791 @Override 792 protected void dispatchVisibilityChanged(View changedView, int visibility) { 793 super.dispatchVisibilityChanged(changedView, visibility); 794 final int count = mChildrenCount; 795 final View[] children = mChildren; 796 for (int i = 0; i < count; i++) { 797 children[i].dispatchVisibilityChanged(changedView, visibility); 798 } 799 } 800 801 /** 802 * {@inheritDoc} 803 */ 804 @Override 805 public void dispatchWindowVisibilityChanged(int visibility) { 806 super.dispatchWindowVisibilityChanged(visibility); 807 final int count = mChildrenCount; 808 final View[] children = mChildren; 809 for (int i = 0; i < count; i++) { 810 children[i].dispatchWindowVisibilityChanged(visibility); 811 } 812 } 813 814 /** 815 * {@inheritDoc} 816 */ 817 @Override 818 public void dispatchConfigurationChanged(Configuration newConfig) { 819 super.dispatchConfigurationChanged(newConfig); 820 final int count = mChildrenCount; 821 final View[] children = mChildren; 822 for (int i = 0; i < count; i++) { 823 children[i].dispatchConfigurationChanged(newConfig); 824 } 825 } 826 827 /** 828 * {@inheritDoc} 829 */ 830 public void recomputeViewAttributes(View child) { 831 ViewParent parent = mParent; 832 if (parent != null) parent.recomputeViewAttributes(this); 833 } 834 835 @Override 836 void dispatchCollectViewAttributes(int visibility) { 837 visibility |= mViewFlags&VISIBILITY_MASK; 838 super.dispatchCollectViewAttributes(visibility); 839 final int count = mChildrenCount; 840 final View[] children = mChildren; 841 for (int i = 0; i < count; i++) { 842 children[i].dispatchCollectViewAttributes(visibility); 843 } 844 } 845 846 /** 847 * {@inheritDoc} 848 */ 849 public void bringChildToFront(View child) { 850 int index = indexOfChild(child); 851 if (index >= 0) { 852 removeFromArray(index); 853 addInArray(child, mChildrenCount); 854 child.mParent = this; 855 } 856 } 857 858 /** 859 * {@inheritDoc} 860 * 861 * !!! TODO: write real docs 862 */ 863 @Override 864 public boolean dispatchDragEvent(DragEvent event) { 865 boolean retval = false; 866 final float tx = event.mX; 867 final float ty = event.mY; 868 869 ViewRoot root = getViewRoot(); 870 871 // Dispatch down the view hierarchy 872 switch (event.mAction) { 873 case DragEvent.ACTION_DRAG_STARTED: { 874 // clear state to recalculate which views we drag over 875 root.setDragFocus(event, null); 876 877 // Now dispatch down to our children, caching the responses 878 mChildAcceptsDrag = false; 879 final int count = mChildrenCount; 880 final View[] children = mChildren; 881 for (int i = 0; i < count; i++) { 882 final View child = children[i]; 883 if (child.getVisibility() == VISIBLE) { 884 final boolean handled = children[i].dispatchDragEvent(event); 885 children[i].mCanAcceptDrop = handled; 886 if (handled) { 887 mChildAcceptsDrag = true; 888 } 889 } 890 } 891 892 // Return HANDLED if one of our children can accept the drag 893 if (mChildAcceptsDrag) { 894 retval = true; 895 } 896 } break; 897 898 case DragEvent.ACTION_DRAG_ENDED: { 899 // Notify all of our children that the drag is over 900 final int count = mChildrenCount; 901 final View[] children = mChildren; 902 for (int i = 0; i < count; i++) { 903 final View child = children[i]; 904 if (child.getVisibility() == VISIBLE) { 905 child.dispatchDragEvent(event); 906 } 907 } 908 // We consider drag-ended to have been handled if one of our children 909 // had offered to handle the drag. 910 if (mChildAcceptsDrag) { 911 retval = true; 912 } 913 } break; 914 915 case DragEvent.ACTION_DRAG_LOCATION: { 916 // Find the [possibly new] drag target 917 final View target = findFrontmostDroppableChildAt(event.mX, event.mY, mLocalPoint); 918 919 // If we've changed apparent drag target, tell the view root which view 920 // we're over now. This will in turn send out DRAG_ENTERED / DRAG_EXITED 921 // notifications as appropriate. 922 if (mCurrentDragView != target) { 923 root.setDragFocus(event, target); 924 mCurrentDragView = target; 925 } 926 927 // Dispatch the actual drag location notice, localized into its coordinates 928 if (target != null) { 929 event.mX = mLocalPoint.x; 930 event.mY = mLocalPoint.y; 931 932 retval = target.dispatchDragEvent(event); 933 934 event.mX = tx; 935 event.mY = ty; 936 } 937 } break; 938 939 case DragEvent.ACTION_DROP: { 940 if (ViewDebug.DEBUG_DRAG) Log.d(View.VIEW_LOG_TAG, "Drop event: " + event); 941 View target = findFrontmostDroppableChildAt(event.mX, event.mY, mLocalPoint); 942 if (target != null) { 943 event.mX = mLocalPoint.x; 944 event.mY = mLocalPoint.y; 945 retval = target.dispatchDragEvent(event); 946 event.mX = tx; 947 event.mY = ty; 948 } 949 } break; 950 } 951 952 // If none of our children could handle the event, try here 953 if (!retval) { 954 retval = onDragEvent(event); 955 } 956 return retval; 957 } 958 959 // Find the frontmost child view that lies under the given point, and calculate 960 // the position within its own local coordinate system. 961 View findFrontmostDroppableChildAt(float x, float y, PointF outLocalPoint) { 962 final int count = mChildrenCount; 963 final View[] children = mChildren; 964 for (int i = count - 1; i >= 0; i--) { 965 final View child = children[i]; 966 if (child.mCanAcceptDrop == false) { 967 continue; 968 } 969 970 if (isTransformedTouchPointInView(x, y, child, outLocalPoint)) { 971 return child; 972 } 973 } 974 return null; 975 } 976 977 /** 978 * {@inheritDoc} 979 */ 980 @Override 981 public boolean dispatchKeyEventPreIme(KeyEvent event) { 982 if ((mPrivateFlags & (FOCUSED | HAS_BOUNDS)) == (FOCUSED | HAS_BOUNDS)) { 983 return super.dispatchKeyEventPreIme(event); 984 } else if (mFocused != null && (mFocused.mPrivateFlags & HAS_BOUNDS) == HAS_BOUNDS) { 985 return mFocused.dispatchKeyEventPreIme(event); 986 } 987 return false; 988 } 989 990 /** 991 * {@inheritDoc} 992 */ 993 @Override 994 public boolean dispatchKeyEvent(KeyEvent event) { 995 if ((mPrivateFlags & (FOCUSED | HAS_BOUNDS)) == (FOCUSED | HAS_BOUNDS)) { 996 return super.dispatchKeyEvent(event); 997 } else if (mFocused != null && (mFocused.mPrivateFlags & HAS_BOUNDS) == HAS_BOUNDS) { 998 return mFocused.dispatchKeyEvent(event); 999 } 1000 return false; 1001 } 1002 1003 /** 1004 * {@inheritDoc} 1005 */ 1006 @Override 1007 public boolean dispatchKeyShortcutEvent(KeyEvent event) { 1008 if ((mPrivateFlags & (FOCUSED | HAS_BOUNDS)) == (FOCUSED | HAS_BOUNDS)) { 1009 return super.dispatchKeyShortcutEvent(event); 1010 } else if (mFocused != null && (mFocused.mPrivateFlags & HAS_BOUNDS) == HAS_BOUNDS) { 1011 return mFocused.dispatchKeyShortcutEvent(event); 1012 } 1013 return false; 1014 } 1015 1016 /** 1017 * {@inheritDoc} 1018 */ 1019 @Override 1020 public boolean dispatchTrackballEvent(MotionEvent event) { 1021 if ((mPrivateFlags & (FOCUSED | HAS_BOUNDS)) == (FOCUSED | HAS_BOUNDS)) { 1022 return super.dispatchTrackballEvent(event); 1023 } else if (mFocused != null && (mFocused.mPrivateFlags & HAS_BOUNDS) == HAS_BOUNDS) { 1024 return mFocused.dispatchTrackballEvent(event); 1025 } 1026 return false; 1027 } 1028 1029 /** 1030 * {@inheritDoc} 1031 */ 1032 @Override 1033 public boolean dispatchTouchEvent(MotionEvent ev) { 1034 if (!onFilterTouchEventForSecurity(ev)) { 1035 return false; 1036 } 1037 1038 final int action = ev.getAction(); 1039 final int actionMasked = action & MotionEvent.ACTION_MASK; 1040 1041 // Handle an initial down. 1042 if (actionMasked == MotionEvent.ACTION_DOWN) { 1043 // Throw away all previous state when starting a new touch gesture. 1044 // The framework may have dropped the up or cancel event for the previous gesture 1045 // due to an app switch, ANR, or some other state change. 1046 cancelAndClearTouchTargets(ev); 1047 resetTouchState(); 1048 } 1049 1050 // Check for interception. 1051 final boolean intercepted; 1052 if (actionMasked == MotionEvent.ACTION_DOWN || mFirstTouchTarget != null) { 1053 final boolean disallowIntercept = (mGroupFlags & FLAG_DISALLOW_INTERCEPT) != 0; 1054 if (!disallowIntercept) { 1055 intercepted = onInterceptTouchEvent(ev); 1056 ev.setAction(action); // restore action in case onInterceptTouchEvent() changed it 1057 } else { 1058 intercepted = false; 1059 } 1060 } else { 1061 intercepted = true; 1062 } 1063 1064 // Check for cancelation. 1065 final boolean canceled = resetCancelNextUpFlag(this) 1066 || actionMasked == MotionEvent.ACTION_CANCEL; 1067 1068 // Update list of touch targets for pointer down, if needed. 1069 final boolean split = (mGroupFlags & FLAG_SPLIT_MOTION_EVENTS) != 0; 1070 TouchTarget newTouchTarget = null; 1071 boolean alreadyDispatchedToNewTouchTarget = false; 1072 if (!canceled && !intercepted) { 1073 if (actionMasked == MotionEvent.ACTION_DOWN 1074 || (split && actionMasked == MotionEvent.ACTION_POINTER_DOWN)) { 1075 final int actionIndex = ev.getActionIndex(); // always 0 for down 1076 final int idBitsToAssign = split ? 1 << ev.getPointerId(actionIndex) 1077 : TouchTarget.ALL_POINTER_IDS; 1078 1079 // Clean up earlier touch targets for this pointer id in case they 1080 // have become out of sync. 1081 removePointersFromTouchTargets(idBitsToAssign); 1082 1083 final int childrenCount = mChildrenCount; 1084 if (childrenCount != 0) { 1085 // Find a child that can receive the event. Scan children from front to back. 1086 final View[] children = mChildren; 1087 final float x = ev.getX(actionIndex); 1088 final float y = ev.getY(actionIndex); 1089 1090 for (int i = childrenCount - 1; i >= 0; i--) { 1091 final View child = children[i]; 1092 if ((child.mViewFlags & VISIBILITY_MASK) != VISIBLE 1093 && child.getAnimation() == null) { 1094 // Skip invisible child unless it is animating. 1095 continue; 1096 } 1097 1098 if (!isTransformedTouchPointInView(x, y, child, null)) { 1099 // New pointer is out of child's bounds. 1100 continue; 1101 } 1102 1103 newTouchTarget = getTouchTarget(child); 1104 if (newTouchTarget != null) { 1105 // Child is already receiving touch within its bounds. 1106 // Give it the new pointer in addition to the ones it is handling. 1107 newTouchTarget.pointerIdBits |= idBitsToAssign; 1108 break; 1109 } 1110 1111 resetCancelNextUpFlag(child); 1112 if (dispatchTransformedTouchEvent(ev, false, child, idBitsToAssign)) { 1113 // Child wants to receive touch within its bounds. 1114 newTouchTarget = addTouchTarget(child, idBitsToAssign); 1115 alreadyDispatchedToNewTouchTarget = true; 1116 break; 1117 } 1118 } 1119 } 1120 1121 if (newTouchTarget == null && mFirstTouchTarget != null) { 1122 // Did not find a child to receive the event. 1123 // Assign the pointer to the least recently added target. 1124 newTouchTarget = mFirstTouchTarget; 1125 while (newTouchTarget.next != null) { 1126 newTouchTarget = newTouchTarget.next; 1127 } 1128 newTouchTarget.pointerIdBits |= idBitsToAssign; 1129 } 1130 } 1131 } 1132 1133 // Dispatch to touch targets. 1134 boolean handled = false; 1135 if (mFirstTouchTarget == null) { 1136 // No touch targets so treat this as an ordinary view. 1137 handled = dispatchTransformedTouchEvent(ev, canceled, null, 1138 TouchTarget.ALL_POINTER_IDS); 1139 } else { 1140 // Dispatch to touch targets, excluding the new touch target if we already 1141 // dispatched to it. Cancel touch targets if necessary. 1142 TouchTarget predecessor = null; 1143 TouchTarget target = mFirstTouchTarget; 1144 while (target != null) { 1145 final TouchTarget next = target.next; 1146 if (alreadyDispatchedToNewTouchTarget && target == newTouchTarget) { 1147 handled = true; 1148 } else { 1149 final boolean cancelChild = resetCancelNextUpFlag(target.child) || intercepted; 1150 if (dispatchTransformedTouchEvent(ev, cancelChild, 1151 target.child, target.pointerIdBits)) { 1152 handled = true; 1153 } 1154 if (cancelChild) { 1155 if (predecessor == null) { 1156 mFirstTouchTarget = next; 1157 } else { 1158 predecessor.next = next; 1159 } 1160 target.recycle(); 1161 target = next; 1162 continue; 1163 } 1164 } 1165 predecessor = target; 1166 target = next; 1167 } 1168 } 1169 1170 // Update list of touch targets for pointer up or cancel, if needed. 1171 if (canceled || actionMasked == MotionEvent.ACTION_UP) { 1172 resetTouchState(); 1173 } else if (split && actionMasked == MotionEvent.ACTION_POINTER_UP) { 1174 final int actionIndex = ev.getActionIndex(); 1175 final int idBitsToRemove = 1 << ev.getPointerId(actionIndex); 1176 removePointersFromTouchTargets(idBitsToRemove); 1177 } 1178 1179 return handled; 1180 } 1181 1182 /* Resets all touch state in preparation for a new cycle. */ 1183 private final void resetTouchState() { 1184 clearTouchTargets(); 1185 resetCancelNextUpFlag(this); 1186 mGroupFlags &= ~FLAG_DISALLOW_INTERCEPT; 1187 } 1188 1189 /* Resets the cancel next up flag. 1190 * Returns true if the flag was previously set. */ 1191 private final boolean resetCancelNextUpFlag(View view) { 1192 if ((view.mPrivateFlags & CANCEL_NEXT_UP_EVENT) != 0) { 1193 view.mPrivateFlags &= ~CANCEL_NEXT_UP_EVENT; 1194 return true; 1195 } 1196 return false; 1197 } 1198 1199 /* Clears all touch targets. */ 1200 private final void clearTouchTargets() { 1201 TouchTarget target = mFirstTouchTarget; 1202 if (target != null) { 1203 do { 1204 TouchTarget next = target.next; 1205 target.recycle(); 1206 target = next; 1207 } while (target != null); 1208 mFirstTouchTarget = null; 1209 } 1210 } 1211 1212 /* Cancels and clears all touch targets. */ 1213 private final void cancelAndClearTouchTargets(MotionEvent event) { 1214 if (mFirstTouchTarget != null) { 1215 boolean syntheticEvent = false; 1216 if (event == null) { 1217 final long now = SystemClock.uptimeMillis(); 1218 event = MotionEvent.obtain(now, now, 1219 MotionEvent.ACTION_CANCEL, 0.0f, 0.0f, 0); 1220 syntheticEvent = true; 1221 } 1222 1223 for (TouchTarget target = mFirstTouchTarget; target != null; target = target.next) { 1224 resetCancelNextUpFlag(target.child); 1225 dispatchTransformedTouchEvent(event, true, target.child, target.pointerIdBits); 1226 } 1227 clearTouchTargets(); 1228 1229 if (syntheticEvent) { 1230 event.recycle(); 1231 } 1232 } 1233 } 1234 1235 /* Gets the touch target for specified child view. 1236 * Returns null if not found. */ 1237 private final TouchTarget getTouchTarget(View child) { 1238 for (TouchTarget target = mFirstTouchTarget; target != null; target = target.next) { 1239 if (target.child == child) { 1240 return target; 1241 } 1242 } 1243 return null; 1244 } 1245 1246 /* Adds a touch target for specified child to the beginning of the list. 1247 * Assumes the target child is not already present. */ 1248 private final TouchTarget addTouchTarget(View child, int pointerIdBits) { 1249 TouchTarget target = TouchTarget.obtain(child, pointerIdBits); 1250 target.next = mFirstTouchTarget; 1251 mFirstTouchTarget = target; 1252 return target; 1253 } 1254 1255 /* Removes the pointer ids from consideration. */ 1256 private final void removePointersFromTouchTargets(int pointerIdBits) { 1257 TouchTarget predecessor = null; 1258 TouchTarget target = mFirstTouchTarget; 1259 while (target != null) { 1260 final TouchTarget next = target.next; 1261 if ((target.pointerIdBits & pointerIdBits) != 0) { 1262 target.pointerIdBits &= ~pointerIdBits; 1263 if (target.pointerIdBits == 0) { 1264 if (predecessor == null) { 1265 mFirstTouchTarget = next; 1266 } else { 1267 predecessor.next = next; 1268 } 1269 target.recycle(); 1270 target = next; 1271 continue; 1272 } 1273 } 1274 predecessor = target; 1275 target = next; 1276 } 1277 } 1278 1279 /* Returns true if a child view contains the specified point when transformed 1280 * into its coordinate space. 1281 * Child must not be null. */ 1282 private final boolean isTransformedTouchPointInView(float x, float y, View child, 1283 PointF outLocalPoint) { 1284 float localX = x + mScrollX - child.mLeft; 1285 float localY = y + mScrollY - child.mTop; 1286 if (! child.hasIdentityMatrix() && mAttachInfo != null) { 1287 final float[] localXY = mAttachInfo.mTmpTransformLocation; 1288 localXY[0] = localX; 1289 localXY[1] = localY; 1290 child.getInverseMatrix().mapPoints(localXY); 1291 localX = localXY[0]; 1292 localY = localXY[1]; 1293 } 1294 final boolean isInView = child.pointInView(localX, localY); 1295 if (isInView && outLocalPoint != null) { 1296 outLocalPoint.set(localX, localY); 1297 } 1298 return isInView; 1299 } 1300 1301 /* Transforms a motion event into the coordinate space of a particular child view, 1302 * filters out irrelevant pointer ids, and overrides its action if necessary. 1303 * If child is null, assumes the MotionEvent will be sent to this ViewGroup instead. */ 1304 private final boolean dispatchTransformedTouchEvent(MotionEvent event, boolean cancel, 1305 View child, int desiredPointerIdBits) { 1306 final boolean handled; 1307 1308 // Canceling motions is a special case. We don't need to perform any transformations 1309 // or filtering. The important part is the action, not the contents. 1310 final int oldAction = event.getAction(); 1311 if (cancel || oldAction == MotionEvent.ACTION_CANCEL) { 1312 event.setAction(MotionEvent.ACTION_CANCEL); 1313 if (child == null) { 1314 handled = super.dispatchTouchEvent(event); 1315 } else { 1316 handled = child.dispatchTouchEvent(event); 1317 } 1318 event.setAction(oldAction); 1319 return handled; 1320 } 1321 1322 // Calculate the number of pointers to deliver. 1323 final int oldPointerCount = event.getPointerCount(); 1324 int newPointerCount = 0; 1325 if (desiredPointerIdBits == TouchTarget.ALL_POINTER_IDS) { 1326 newPointerCount = oldPointerCount; 1327 } else { 1328 for (int i = 0; i < oldPointerCount; i++) { 1329 final int pointerId = event.getPointerId(i); 1330 final int pointerIdBit = 1 << pointerId; 1331 if ((pointerIdBit & desiredPointerIdBits) != 0) { 1332 newPointerCount += 1; 1333 } 1334 } 1335 } 1336 1337 // If for some reason we ended up in an inconsistent state where it looks like we 1338 // might produce a motion event with no pointers in it, then drop the event. 1339 if (newPointerCount == 0) { 1340 return false; 1341 } 1342 1343 // If the number of pointers is the same and we don't need to perform any fancy 1344 // irreversible transformations, then we can reuse the motion event for this 1345 // dispatch as long as we are careful to revert any changes we make. 1346 final boolean reuse = newPointerCount == oldPointerCount 1347 && (child == null || child.hasIdentityMatrix()); 1348 if (reuse) { 1349 if (child == null) { 1350 handled = super.dispatchTouchEvent(event); 1351 } else { 1352 final float offsetX = mScrollX - child.mLeft; 1353 final float offsetY = mScrollY - child.mTop; 1354 event.offsetLocation(offsetX, offsetY); 1355 1356 handled = child.dispatchTouchEvent(event); 1357 1358 event.offsetLocation(-offsetX, -offsetY); 1359 } 1360 return handled; 1361 } 1362 1363 // Make a copy of the event. 1364 // If the number of pointers is different, then we need to filter out irrelevant pointers 1365 // as we make a copy of the motion event. 1366 MotionEvent transformedEvent; 1367 if (newPointerCount == oldPointerCount) { 1368 transformedEvent = MotionEvent.obtain(event); 1369 } else { 1370 growTmpPointerArrays(newPointerCount); 1371 final int[] newPointerIndexMap = mTmpPointerIndexMap; 1372 final int[] newPointerIds = mTmpPointerIds; 1373 final MotionEvent.PointerCoords[] newPointerCoords = mTmpPointerCoords; 1374 1375 int newPointerIndex = 0; 1376 int oldPointerIndex = 0; 1377 while (newPointerIndex < newPointerCount) { 1378 final int pointerId = event.getPointerId(oldPointerIndex); 1379 final int pointerIdBits = 1 << pointerId; 1380 if ((pointerIdBits & desiredPointerIdBits) != 0) { 1381 newPointerIndexMap[newPointerIndex] = oldPointerIndex; 1382 newPointerIds[newPointerIndex] = pointerId; 1383 if (newPointerCoords[newPointerIndex] == null) { 1384 newPointerCoords[newPointerIndex] = new MotionEvent.PointerCoords(); 1385 } 1386 1387 newPointerIndex += 1; 1388 } 1389 oldPointerIndex += 1; 1390 } 1391 1392 final int newAction; 1393 if (cancel) { 1394 newAction = MotionEvent.ACTION_CANCEL; 1395 } else { 1396 final int oldMaskedAction = oldAction & MotionEvent.ACTION_MASK; 1397 if (oldMaskedAction == MotionEvent.ACTION_POINTER_DOWN 1398 || oldMaskedAction == MotionEvent.ACTION_POINTER_UP) { 1399 final int changedPointerId = event.getPointerId( 1400 (oldAction & MotionEvent.ACTION_POINTER_INDEX_MASK) 1401 >> MotionEvent.ACTION_POINTER_INDEX_SHIFT); 1402 final int changedPointerIdBits = 1 << changedPointerId; 1403 if ((changedPointerIdBits & desiredPointerIdBits) != 0) { 1404 if (newPointerCount == 1) { 1405 // The first/last pointer went down/up. 1406 newAction = oldMaskedAction == MotionEvent.ACTION_POINTER_DOWN 1407 ? MotionEvent.ACTION_DOWN : MotionEvent.ACTION_UP; 1408 } else { 1409 // A secondary pointer went down/up. 1410 int newChangedPointerIndex = 0; 1411 while (newPointerIds[newChangedPointerIndex] != changedPointerId) { 1412 newChangedPointerIndex += 1; 1413 } 1414 newAction = oldMaskedAction | (newChangedPointerIndex 1415 << MotionEvent.ACTION_POINTER_INDEX_SHIFT); 1416 } 1417 } else { 1418 // An unrelated pointer changed. 1419 newAction = MotionEvent.ACTION_MOVE; 1420 } 1421 } else { 1422 // Simple up/down/cancel/move motion action. 1423 newAction = oldMaskedAction; 1424 } 1425 } 1426 1427 transformedEvent = null; 1428 final int historySize = event.getHistorySize(); 1429 for (int historyIndex = 0; historyIndex <= historySize; historyIndex++) { 1430 for (newPointerIndex = 0; newPointerIndex < newPointerCount; newPointerIndex++) { 1431 final MotionEvent.PointerCoords c = newPointerCoords[newPointerIndex]; 1432 oldPointerIndex = newPointerIndexMap[newPointerIndex]; 1433 if (historyIndex != historySize) { 1434 event.getHistoricalPointerCoords(oldPointerIndex, historyIndex, c); 1435 } else { 1436 event.getPointerCoords(oldPointerIndex, c); 1437 } 1438 } 1439 1440 final long eventTime; 1441 if (historyIndex != historySize) { 1442 eventTime = event.getHistoricalEventTime(historyIndex); 1443 } else { 1444 eventTime = event.getEventTime(); 1445 } 1446 1447 if (transformedEvent == null) { 1448 transformedEvent = MotionEvent.obtain( 1449 event.getDownTime(), eventTime, newAction, 1450 newPointerCount, newPointerIds, newPointerCoords, 1451 event.getMetaState(), event.getXPrecision(), event.getYPrecision(), 1452 event.getDeviceId(), event.getEdgeFlags(), event.getSource(), 1453 event.getFlags()); 1454 } else { 1455 transformedEvent.addBatch(eventTime, newPointerCoords, 0); 1456 } 1457 } 1458 } 1459 1460 // Perform any necessary transformations and dispatch. 1461 if (child == null) { 1462 handled = super.dispatchTouchEvent(transformedEvent); 1463 } else { 1464 final float offsetX = mScrollX - child.mLeft; 1465 final float offsetY = mScrollY - child.mTop; 1466 transformedEvent.offsetLocation(offsetX, offsetY); 1467 if (! child.hasIdentityMatrix()) { 1468 transformedEvent.transform(child.getInverseMatrix()); 1469 } 1470 1471 handled = child.dispatchTouchEvent(transformedEvent); 1472 } 1473 1474 // Done. 1475 transformedEvent.recycle(); 1476 return handled; 1477 } 1478 1479 /* Enlarge the temporary pointer arrays for splitting pointers. 1480 * May discard contents (but keeps PointerCoords objects to avoid reallocating them). */ 1481 private final void growTmpPointerArrays(int desiredCapacity) { 1482 final MotionEvent.PointerCoords[] oldTmpPointerCoords = mTmpPointerCoords; 1483 int capacity; 1484 if (oldTmpPointerCoords != null) { 1485 capacity = oldTmpPointerCoords.length; 1486 if (desiredCapacity <= capacity) { 1487 return; 1488 } 1489 } else { 1490 capacity = 4; 1491 } 1492 1493 while (capacity < desiredCapacity) { 1494 capacity *= 2; 1495 } 1496 1497 mTmpPointerIndexMap = new int[capacity]; 1498 mTmpPointerIds = new int[capacity]; 1499 mTmpPointerCoords = new MotionEvent.PointerCoords[capacity]; 1500 1501 if (oldTmpPointerCoords != null) { 1502 System.arraycopy(oldTmpPointerCoords, 0, mTmpPointerCoords, 0, 1503 oldTmpPointerCoords.length); 1504 } 1505 } 1506 1507 /** 1508 * Enable or disable the splitting of MotionEvents to multiple children during touch event 1509 * dispatch. This behavior is disabled by default. 1510 * 1511 * <p>When this option is enabled MotionEvents may be split and dispatched to different child 1512 * views depending on where each pointer initially went down. This allows for user interactions 1513 * such as scrolling two panes of content independently, chording of buttons, and performing 1514 * independent gestures on different pieces of content. 1515 * 1516 * @param split <code>true</code> to allow MotionEvents to be split and dispatched to multiple 1517 * child views. <code>false</code> to only allow one child view to be the target of 1518 * any MotionEvent received by this ViewGroup. 1519 */ 1520 public void setMotionEventSplittingEnabled(boolean split) { 1521 // TODO Applications really shouldn't change this setting mid-touch event, 1522 // but perhaps this should handle that case and send ACTION_CANCELs to any child views 1523 // with gestures in progress when this is changed. 1524 if (split) { 1525 mGroupFlags |= FLAG_SPLIT_MOTION_EVENTS; 1526 } else { 1527 mGroupFlags &= ~FLAG_SPLIT_MOTION_EVENTS; 1528 } 1529 } 1530 1531 /** 1532 * @return true if MotionEvents dispatched to this ViewGroup can be split to multiple children. 1533 */ 1534 public boolean isMotionEventSplittingEnabled() { 1535 return (mGroupFlags & FLAG_SPLIT_MOTION_EVENTS) == FLAG_SPLIT_MOTION_EVENTS; 1536 } 1537 1538 /** 1539 * {@inheritDoc} 1540 */ 1541 public void requestDisallowInterceptTouchEvent(boolean disallowIntercept) { 1542 1543 if (disallowIntercept == ((mGroupFlags & FLAG_DISALLOW_INTERCEPT) != 0)) { 1544 // We're already in this state, assume our ancestors are too 1545 return; 1546 } 1547 1548 if (disallowIntercept) { 1549 mGroupFlags |= FLAG_DISALLOW_INTERCEPT; 1550 } else { 1551 mGroupFlags &= ~FLAG_DISALLOW_INTERCEPT; 1552 } 1553 1554 // Pass it up to our parent 1555 if (mParent != null) { 1556 mParent.requestDisallowInterceptTouchEvent(disallowIntercept); 1557 } 1558 } 1559 1560 /** 1561 * Implement this method to intercept all touch screen motion events. This 1562 * allows you to watch events as they are dispatched to your children, and 1563 * take ownership of the current gesture at any point. 1564 * 1565 * <p>Using this function takes some care, as it has a fairly complicated 1566 * interaction with {@link View#onTouchEvent(MotionEvent) 1567 * View.onTouchEvent(MotionEvent)}, and using it requires implementing 1568 * that method as well as this one in the correct way. Events will be 1569 * received in the following order: 1570 * 1571 * <ol> 1572 * <li> You will receive the down event here. 1573 * <li> The down event will be handled either by a child of this view 1574 * group, or given to your own onTouchEvent() method to handle; this means 1575 * you should implement onTouchEvent() to return true, so you will 1576 * continue to see the rest of the gesture (instead of looking for 1577 * a parent view to handle it). Also, by returning true from 1578 * onTouchEvent(), you will not receive any following 1579 * events in onInterceptTouchEvent() and all touch processing must 1580 * happen in onTouchEvent() like normal. 1581 * <li> For as long as you return false from this function, each following 1582 * event (up to and including the final up) will be delivered first here 1583 * and then to the target's onTouchEvent(). 1584 * <li> If you return true from here, you will not receive any 1585 * following events: the target view will receive the same event but 1586 * with the action {@link MotionEvent#ACTION_CANCEL}, and all further 1587 * events will be delivered to your onTouchEvent() method and no longer 1588 * appear here. 1589 * </ol> 1590 * 1591 * @param ev The motion event being dispatched down the hierarchy. 1592 * @return Return true to steal motion events from the children and have 1593 * them dispatched to this ViewGroup through onTouchEvent(). 1594 * The current target will receive an ACTION_CANCEL event, and no further 1595 * messages will be delivered here. 1596 */ 1597 public boolean onInterceptTouchEvent(MotionEvent ev) { 1598 return false; 1599 } 1600 1601 /** 1602 * {@inheritDoc} 1603 * 1604 * Looks for a view to give focus to respecting the setting specified by 1605 * {@link #getDescendantFocusability()}. 1606 * 1607 * Uses {@link #onRequestFocusInDescendants(int, android.graphics.Rect)} to 1608 * find focus within the children of this group when appropriate. 1609 * 1610 * @see #FOCUS_BEFORE_DESCENDANTS 1611 * @see #FOCUS_AFTER_DESCENDANTS 1612 * @see #FOCUS_BLOCK_DESCENDANTS 1613 * @see #onRequestFocusInDescendants 1614 */ 1615 @Override 1616 public boolean requestFocus(int direction, Rect previouslyFocusedRect) { 1617 if (DBG) { 1618 System.out.println(this + " ViewGroup.requestFocus direction=" 1619 + direction); 1620 } 1621 int descendantFocusability = getDescendantFocusability(); 1622 1623 switch (descendantFocusability) { 1624 case FOCUS_BLOCK_DESCENDANTS: 1625 return super.requestFocus(direction, previouslyFocusedRect); 1626 case FOCUS_BEFORE_DESCENDANTS: { 1627 final boolean took = super.requestFocus(direction, previouslyFocusedRect); 1628 return took ? took : onRequestFocusInDescendants(direction, previouslyFocusedRect); 1629 } 1630 case FOCUS_AFTER_DESCENDANTS: { 1631 final boolean took = onRequestFocusInDescendants(direction, previouslyFocusedRect); 1632 return took ? took : super.requestFocus(direction, previouslyFocusedRect); 1633 } 1634 default: 1635 throw new IllegalStateException("descendant focusability must be " 1636 + "one of FOCUS_BEFORE_DESCENDANTS, FOCUS_AFTER_DESCENDANTS, FOCUS_BLOCK_DESCENDANTS " 1637 + "but is " + descendantFocusability); 1638 } 1639 } 1640 1641 /** 1642 * Look for a descendant to call {@link View#requestFocus} on. 1643 * Called by {@link ViewGroup#requestFocus(int, android.graphics.Rect)} 1644 * when it wants to request focus within its children. Override this to 1645 * customize how your {@link ViewGroup} requests focus within its children. 1646 * @param direction One of FOCUS_UP, FOCUS_DOWN, FOCUS_LEFT, and FOCUS_RIGHT 1647 * @param previouslyFocusedRect The rectangle (in this View's coordinate system) 1648 * to give a finer grained hint about where focus is coming from. May be null 1649 * if there is no hint. 1650 * @return Whether focus was taken. 1651 */ 1652 @SuppressWarnings({"ConstantConditions"}) 1653 protected boolean onRequestFocusInDescendants(int direction, 1654 Rect previouslyFocusedRect) { 1655 int index; 1656 int increment; 1657 int end; 1658 int count = mChildrenCount; 1659 if ((direction & FOCUS_FORWARD) != 0) { 1660 index = 0; 1661 increment = 1; 1662 end = count; 1663 } else { 1664 index = count - 1; 1665 increment = -1; 1666 end = -1; 1667 } 1668 final View[] children = mChildren; 1669 for (int i = index; i != end; i += increment) { 1670 View child = children[i]; 1671 if ((child.mViewFlags & VISIBILITY_MASK) == VISIBLE) { 1672 if (child.requestFocus(direction, previouslyFocusedRect)) { 1673 return true; 1674 } 1675 } 1676 } 1677 return false; 1678 } 1679 1680 /** 1681 * {@inheritDoc} 1682 * 1683 * @hide 1684 */ 1685 @Override 1686 public void dispatchStartTemporaryDetach() { 1687 super.dispatchStartTemporaryDetach(); 1688 final int count = mChildrenCount; 1689 final View[] children = mChildren; 1690 for (int i = 0; i < count; i++) { 1691 children[i].dispatchStartTemporaryDetach(); 1692 } 1693 } 1694 1695 /** 1696 * {@inheritDoc} 1697 * 1698 * @hide 1699 */ 1700 @Override 1701 public void dispatchFinishTemporaryDetach() { 1702 super.dispatchFinishTemporaryDetach(); 1703 final int count = mChildrenCount; 1704 final View[] children = mChildren; 1705 for (int i = 0; i < count; i++) { 1706 children[i].dispatchFinishTemporaryDetach(); 1707 } 1708 } 1709 1710 /** 1711 * {@inheritDoc} 1712 */ 1713 @Override 1714 void dispatchAttachedToWindow(AttachInfo info, int visibility) { 1715 super.dispatchAttachedToWindow(info, visibility); 1716 visibility |= mViewFlags & VISIBILITY_MASK; 1717 final int count = mChildrenCount; 1718 final View[] children = mChildren; 1719 for (int i = 0; i < count; i++) { 1720 children[i].dispatchAttachedToWindow(info, visibility); 1721 } 1722 } 1723 1724 @Override 1725 public boolean dispatchPopulateAccessibilityEvent(AccessibilityEvent event) { 1726 boolean populated = false; 1727 for (int i = 0, count = getChildCount(); i < count; i++) { 1728 populated |= getChildAt(i).dispatchPopulateAccessibilityEvent(event); 1729 } 1730 return populated; 1731 } 1732 1733 /** 1734 * {@inheritDoc} 1735 */ 1736 @Override 1737 void dispatchDetachedFromWindow() { 1738 // If we still have a touch target, we are still in the process of 1739 // dispatching motion events to a child; we need to get rid of that 1740 // child to avoid dispatching events to it after the window is torn 1741 // down. To make sure we keep the child in a consistent state, we 1742 // first send it an ACTION_CANCEL motion event. 1743 cancelAndClearTouchTargets(null); 1744 1745 final int count = mChildrenCount; 1746 final View[] children = mChildren; 1747 for (int i = 0; i < count; i++) { 1748 children[i].dispatchDetachedFromWindow(); 1749 } 1750 super.dispatchDetachedFromWindow(); 1751 } 1752 1753 /** 1754 * {@inheritDoc} 1755 */ 1756 @Override 1757 public void setPadding(int left, int top, int right, int bottom) { 1758 super.setPadding(left, top, right, bottom); 1759 1760 if ((mPaddingLeft | mPaddingTop | mPaddingRight | mPaddingRight) != 0) { 1761 mGroupFlags |= FLAG_PADDING_NOT_NULL; 1762 } else { 1763 mGroupFlags &= ~FLAG_PADDING_NOT_NULL; 1764 } 1765 } 1766 1767 /** 1768 * {@inheritDoc} 1769 */ 1770 @Override 1771 protected void dispatchSaveInstanceState(SparseArray<Parcelable> container) { 1772 super.dispatchSaveInstanceState(container); 1773 final int count = mChildrenCount; 1774 final View[] children = mChildren; 1775 for (int i = 0; i < count; i++) { 1776 View c = children[i]; 1777 if ((c.mViewFlags & PARENT_SAVE_DISABLED_MASK) != PARENT_SAVE_DISABLED) { 1778 c.dispatchSaveInstanceState(container); 1779 } 1780 } 1781 } 1782 1783 /** 1784 * Perform dispatching of a {@link #saveHierarchyState freeze()} to only this view, 1785 * not to its children. For use when overriding 1786 * {@link #dispatchSaveInstanceState dispatchFreeze()} to allow subclasses to freeze 1787 * their own state but not the state of their children. 1788 * 1789 * @param container the container 1790 */ 1791 protected void dispatchFreezeSelfOnly(SparseArray<Parcelable> container) { 1792 super.dispatchSaveInstanceState(container); 1793 } 1794 1795 /** 1796 * {@inheritDoc} 1797 */ 1798 @Override 1799 protected void dispatchRestoreInstanceState(SparseArray<Parcelable> container) { 1800 super.dispatchRestoreInstanceState(container); 1801 final int count = mChildrenCount; 1802 final View[] children = mChildren; 1803 for (int i = 0; i < count; i++) { 1804 View c = children[i]; 1805 if ((c.mViewFlags & PARENT_SAVE_DISABLED_MASK) != PARENT_SAVE_DISABLED) { 1806 c.dispatchRestoreInstanceState(container); 1807 } 1808 } 1809 } 1810 1811 /** 1812 * Perform dispatching of a {@link #restoreHierarchyState thaw()} to only this view, 1813 * not to its children. For use when overriding 1814 * {@link #dispatchRestoreInstanceState dispatchThaw()} to allow subclasses to thaw 1815 * their own state but not the state of their children. 1816 * 1817 * @param container the container 1818 */ 1819 protected void dispatchThawSelfOnly(SparseArray<Parcelable> container) { 1820 super.dispatchRestoreInstanceState(container); 1821 } 1822 1823 /** 1824 * Enables or disables the drawing cache for each child of this view group. 1825 * 1826 * @param enabled true to enable the cache, false to dispose of it 1827 */ 1828 protected void setChildrenDrawingCacheEnabled(boolean enabled) { 1829 if (enabled || (mPersistentDrawingCache & PERSISTENT_ALL_CACHES) != PERSISTENT_ALL_CACHES) { 1830 final View[] children = mChildren; 1831 final int count = mChildrenCount; 1832 for (int i = 0; i < count; i++) { 1833 children[i].setDrawingCacheEnabled(enabled); 1834 } 1835 } 1836 } 1837 1838 @Override 1839 protected void onAnimationStart() { 1840 super.onAnimationStart(); 1841 1842 // When this ViewGroup's animation starts, build the cache for the children 1843 if ((mGroupFlags & FLAG_ANIMATION_CACHE) == FLAG_ANIMATION_CACHE) { 1844 final int count = mChildrenCount; 1845 final View[] children = mChildren; 1846 1847 for (int i = 0; i < count; i++) { 1848 final View child = children[i]; 1849 if ((child.mViewFlags & VISIBILITY_MASK) == VISIBLE) { 1850 child.setDrawingCacheEnabled(true); 1851 child.buildDrawingCache(true); 1852 } 1853 } 1854 1855 mGroupFlags |= FLAG_CHILDREN_DRAWN_WITH_CACHE; 1856 } 1857 } 1858 1859 @Override 1860 protected void onAnimationEnd() { 1861 super.onAnimationEnd(); 1862 1863 // When this ViewGroup's animation ends, destroy the cache of the children 1864 if ((mGroupFlags & FLAG_ANIMATION_CACHE) == FLAG_ANIMATION_CACHE) { 1865 mGroupFlags &= ~FLAG_CHILDREN_DRAWN_WITH_CACHE; 1866 1867 if ((mPersistentDrawingCache & PERSISTENT_ANIMATION_CACHE) == 0) { 1868 setChildrenDrawingCacheEnabled(false); 1869 } 1870 } 1871 } 1872 1873 @Override 1874 Bitmap createSnapshot(Bitmap.Config quality, int backgroundColor, boolean skipChildren) { 1875 int count = mChildrenCount; 1876 int[] visibilities = null; 1877 1878 if (skipChildren) { 1879 visibilities = new int[count]; 1880 for (int i = 0; i < count; i++) { 1881 View child = getChildAt(i); 1882 visibilities[i] = child.getVisibility(); 1883 if (visibilities[i] == View.VISIBLE) { 1884 child.setVisibility(INVISIBLE); 1885 } 1886 } 1887 } 1888 1889 Bitmap b = super.createSnapshot(quality, backgroundColor, skipChildren); 1890 1891 if (skipChildren) { 1892 for (int i = 0; i < count; i++) { 1893 getChildAt(i).setVisibility(visibilities[i]); 1894 } 1895 } 1896 1897 return b; 1898 } 1899 1900 /** 1901 * {@inheritDoc} 1902 */ 1903 @Override 1904 protected void dispatchDraw(Canvas canvas) { 1905 final int count = mChildrenCount; 1906 final View[] children = mChildren; 1907 int flags = mGroupFlags; 1908 1909 if ((flags & FLAG_RUN_ANIMATION) != 0 && canAnimate()) { 1910 final boolean cache = (mGroupFlags & FLAG_ANIMATION_CACHE) == FLAG_ANIMATION_CACHE; 1911 1912 for (int i = 0; i < count; i++) { 1913 final View child = children[i]; 1914 if ((child.mViewFlags & VISIBILITY_MASK) == VISIBLE) { 1915 final LayoutParams params = child.getLayoutParams(); 1916 attachLayoutAnimationParameters(child, params, i, count); 1917 bindLayoutAnimation(child); 1918 if (cache) { 1919 child.setDrawingCacheEnabled(true); 1920 child.buildDrawingCache(true); 1921 } 1922 } 1923 } 1924 1925 final LayoutAnimationController controller = mLayoutAnimationController; 1926 if (controller.willOverlap()) { 1927 mGroupFlags |= FLAG_OPTIMIZE_INVALIDATE; 1928 } 1929 1930 controller.start(); 1931 1932 mGroupFlags &= ~FLAG_RUN_ANIMATION; 1933 mGroupFlags &= ~FLAG_ANIMATION_DONE; 1934 1935 if (cache) { 1936 mGroupFlags |= FLAG_CHILDREN_DRAWN_WITH_CACHE; 1937 } 1938 1939 if (mAnimationListener != null) { 1940 mAnimationListener.onAnimationStart(controller.getAnimation()); 1941 } 1942 } 1943 1944 int saveCount = 0; 1945 final boolean clipToPadding = (flags & CLIP_TO_PADDING_MASK) == CLIP_TO_PADDING_MASK; 1946 if (clipToPadding) { 1947 saveCount = canvas.save(); 1948 canvas.clipRect(mScrollX + mPaddingLeft, mScrollY + mPaddingTop, 1949 mScrollX + mRight - mLeft - mPaddingRight, 1950 mScrollY + mBottom - mTop - mPaddingBottom); 1951 1952 } 1953 1954 // We will draw our child's animation, let's reset the flag 1955 mPrivateFlags &= ~DRAW_ANIMATION; 1956 mGroupFlags &= ~FLAG_INVALIDATE_REQUIRED; 1957 1958 boolean more = false; 1959 final long drawingTime = getDrawingTime(); 1960 1961 if ((flags & FLAG_USE_CHILD_DRAWING_ORDER) == 0) { 1962 for (int i = 0; i < count; i++) { 1963 final View child = children[i]; 1964 if ((child.mViewFlags & VISIBILITY_MASK) == VISIBLE || child.getAnimation() != null) { 1965 more |= drawChild(canvas, child, drawingTime); 1966 } 1967 } 1968 } else { 1969 for (int i = 0; i < count; i++) { 1970 final View child = children[getChildDrawingOrder(count, i)]; 1971 if ((child.mViewFlags & VISIBILITY_MASK) == VISIBLE || child.getAnimation() != null) { 1972 more |= drawChild(canvas, child, drawingTime); 1973 } 1974 } 1975 } 1976 1977 // Draw any disappearing views that have animations 1978 if (mDisappearingChildren != null) { 1979 final ArrayList<View> disappearingChildren = mDisappearingChildren; 1980 final int disappearingCount = disappearingChildren.size() - 1; 1981 // Go backwards -- we may delete as animations finish 1982 for (int i = disappearingCount; i >= 0; i--) { 1983 final View child = disappearingChildren.get(i); 1984 more |= drawChild(canvas, child, drawingTime); 1985 } 1986 } 1987 1988 if (clipToPadding) { 1989 canvas.restoreToCount(saveCount); 1990 } 1991 1992 // mGroupFlags might have been updated by drawChild() 1993 flags = mGroupFlags; 1994 1995 if ((flags & FLAG_INVALIDATE_REQUIRED) == FLAG_INVALIDATE_REQUIRED) { 1996 invalidate(); 1997 } 1998 1999 if ((flags & FLAG_ANIMATION_DONE) == 0 && (flags & FLAG_NOTIFY_ANIMATION_LISTENER) == 0 && 2000 mLayoutAnimationController.isDone() && !more) { 2001 // We want to erase the drawing cache and notify the listener after the 2002 // next frame is drawn because one extra invalidate() is caused by 2003 // drawChild() after the animation is over 2004 mGroupFlags |= FLAG_NOTIFY_ANIMATION_LISTENER; 2005 final Runnable end = new Runnable() { 2006 public void run() { 2007 notifyAnimationListener(); 2008 } 2009 }; 2010 post(end); 2011 } 2012 } 2013 2014 /** 2015 * Returns the index of the child to draw for this iteration. Override this 2016 * if you want to change the drawing order of children. By default, it 2017 * returns i. 2018 * <p> 2019 * NOTE: In order for this method to be called, you must enable child ordering 2020 * first by calling {@link #setChildrenDrawingOrderEnabled(boolean)}. 2021 * 2022 * @param i The current iteration. 2023 * @return The index of the child to draw this iteration. 2024 * 2025 * @see #setChildrenDrawingOrderEnabled(boolean) 2026 * @see #isChildrenDrawingOrderEnabled() 2027 */ 2028 protected int getChildDrawingOrder(int childCount, int i) { 2029 return i; 2030 } 2031 2032 private void notifyAnimationListener() { 2033 mGroupFlags &= ~FLAG_NOTIFY_ANIMATION_LISTENER; 2034 mGroupFlags |= FLAG_ANIMATION_DONE; 2035 2036 if (mAnimationListener != null) { 2037 final Runnable end = new Runnable() { 2038 public void run() { 2039 mAnimationListener.onAnimationEnd(mLayoutAnimationController.getAnimation()); 2040 } 2041 }; 2042 post(end); 2043 } 2044 2045 if ((mGroupFlags & FLAG_ANIMATION_CACHE) == FLAG_ANIMATION_CACHE) { 2046 mGroupFlags &= ~FLAG_CHILDREN_DRAWN_WITH_CACHE; 2047 if ((mPersistentDrawingCache & PERSISTENT_ANIMATION_CACHE) == 0) { 2048 setChildrenDrawingCacheEnabled(false); 2049 } 2050 } 2051 2052 invalidate(); 2053 } 2054 2055 /** 2056 * Draw one child of this View Group. This method is responsible for getting 2057 * the canvas in the right state. This includes clipping, translating so 2058 * that the child's scrolled origin is at 0, 0, and applying any animation 2059 * transformations. 2060 * 2061 * @param canvas The canvas on which to draw the child 2062 * @param child Who to draw 2063 * @param drawingTime The time at which draw is occuring 2064 * @return True if an invalidate() was issued 2065 */ 2066 protected boolean drawChild(Canvas canvas, View child, long drawingTime) { 2067 boolean more = false; 2068 2069 final int cl = child.mLeft; 2070 final int ct = child.mTop; 2071 final int cr = child.mRight; 2072 final int cb = child.mBottom; 2073 2074 final int flags = mGroupFlags; 2075 2076 if ((flags & FLAG_CLEAR_TRANSFORMATION) == FLAG_CLEAR_TRANSFORMATION) { 2077 mChildTransformation.clear(); 2078 mGroupFlags &= ~FLAG_CLEAR_TRANSFORMATION; 2079 } 2080 2081 Transformation transformToApply = null; 2082 Transformation invalidationTransform; 2083 final Animation a = child.getAnimation(); 2084 boolean concatMatrix = false; 2085 2086 boolean scalingRequired = false; 2087 boolean caching = false; 2088 if ((flags & FLAG_CHILDREN_DRAWN_WITH_CACHE) == FLAG_CHILDREN_DRAWN_WITH_CACHE || 2089 (flags & FLAG_ALWAYS_DRAWN_WITH_CACHE) == FLAG_ALWAYS_DRAWN_WITH_CACHE) { 2090 caching = true; 2091 if (mAttachInfo != null) scalingRequired = mAttachInfo.mScalingRequired; 2092 } 2093 2094 if (a != null) { 2095 final boolean initialized = a.isInitialized(); 2096 if (!initialized) { 2097 a.initialize(cr - cl, cb - ct, getWidth(), getHeight()); 2098 a.initializeInvalidateRegion(0, 0, cr - cl, cb - ct); 2099 child.onAnimationStart(); 2100 } 2101 2102 more = a.getTransformation(drawingTime, mChildTransformation, 2103 scalingRequired ? mAttachInfo.mApplicationScale : 1f); 2104 if (scalingRequired && mAttachInfo.mApplicationScale != 1f) { 2105 if (mInvalidationTransformation == null) { 2106 mInvalidationTransformation = new Transformation(); 2107 } 2108 invalidationTransform = mInvalidationTransformation; 2109 a.getTransformation(drawingTime, invalidationTransform, 1f); 2110 } else { 2111 invalidationTransform = mChildTransformation; 2112 } 2113 transformToApply = mChildTransformation; 2114 2115 concatMatrix = a.willChangeTransformationMatrix(); 2116 2117 if (more) { 2118 if (!a.willChangeBounds()) { 2119 if ((flags & (FLAG_OPTIMIZE_INVALIDATE | FLAG_ANIMATION_DONE)) == 2120 FLAG_OPTIMIZE_INVALIDATE) { 2121 mGroupFlags |= FLAG_INVALIDATE_REQUIRED; 2122 } else if ((flags & FLAG_INVALIDATE_REQUIRED) == 0) { 2123 // The child need to draw an animation, potentially offscreen, so 2124 // make sure we do not cancel invalidate requests 2125 mPrivateFlags |= DRAW_ANIMATION; 2126 invalidate(cl, ct, cr, cb); 2127 } 2128 } else { 2129 if (mInvalidateRegion == null) { 2130 mInvalidateRegion = new RectF(); 2131 } 2132 final RectF region = mInvalidateRegion; 2133 a.getInvalidateRegion(0, 0, cr - cl, cb - ct, region, invalidationTransform); 2134 2135 // The child need to draw an animation, potentially offscreen, so 2136 // make sure we do not cancel invalidate requests 2137 mPrivateFlags |= DRAW_ANIMATION; 2138 2139 final int left = cl + (int) region.left; 2140 final int top = ct + (int) region.top; 2141 invalidate(left, top, left + (int) region.width(), top + (int) region.height()); 2142 } 2143 } 2144 } else if ((flags & FLAG_SUPPORT_STATIC_TRANSFORMATIONS) == 2145 FLAG_SUPPORT_STATIC_TRANSFORMATIONS) { 2146 final boolean hasTransform = getChildStaticTransformation(child, mChildTransformation); 2147 if (hasTransform) { 2148 final int transformType = mChildTransformation.getTransformationType(); 2149 transformToApply = transformType != Transformation.TYPE_IDENTITY ? 2150 mChildTransformation : null; 2151 concatMatrix = (transformType & Transformation.TYPE_MATRIX) != 0; 2152 } 2153 } 2154 2155 concatMatrix |= !child.hasIdentityMatrix(); 2156 2157 // Sets the flag as early as possible to allow draw() implementations 2158 // to call invalidate() successfully when doing animations 2159 child.mPrivateFlags |= DRAWN; 2160 2161 if (!concatMatrix && canvas.quickReject(cl, ct, cr, cb, Canvas.EdgeType.BW) && 2162 (child.mPrivateFlags & DRAW_ANIMATION) == 0) { 2163 return more; 2164 } 2165 2166 child.computeScroll(); 2167 2168 final int sx = child.mScrollX; 2169 final int sy = child.mScrollY; 2170 2171 DisplayList displayList = null; 2172 Bitmap cache = null; 2173 if (caching) { 2174 if (!canvas.isHardwareAccelerated()) { 2175 cache = child.getDrawingCache(true); 2176 } else { 2177 displayList = child.getDisplayList(); 2178 } 2179 } 2180 2181 final boolean hasDisplayList = displayList != null && displayList.isReady(); 2182 final boolean hasNoCache = cache == null || hasDisplayList; 2183 2184 final int restoreTo = canvas.save(); 2185 if (hasNoCache) { 2186 canvas.translate(cl - sx, ct - sy); 2187 } else { 2188 canvas.translate(cl, ct); 2189 if (scalingRequired) { 2190 // mAttachInfo cannot be null, otherwise scalingRequired == false 2191 final float scale = 1.0f / mAttachInfo.mApplicationScale; 2192 canvas.scale(scale, scale); 2193 } 2194 } 2195 2196 float alpha = child.getAlpha(); 2197 2198 if (transformToApply != null || alpha < 1.0f || !child.hasIdentityMatrix()) { 2199 int transX = 0; 2200 int transY = 0; 2201 2202 if (hasNoCache) { 2203 transX = -sx; 2204 transY = -sy; 2205 } 2206 2207 if (transformToApply != null) { 2208 if (concatMatrix) { 2209 // Undo the scroll translation, apply the transformation matrix, 2210 // then redo the scroll translate to get the correct result. 2211 canvas.translate(-transX, -transY); 2212 canvas.concat(transformToApply.getMatrix()); 2213 canvas.translate(transX, transY); 2214 mGroupFlags |= FLAG_CLEAR_TRANSFORMATION; 2215 } 2216 2217 float transformAlpha = transformToApply.getAlpha(); 2218 if (transformAlpha < 1.0f) { 2219 alpha *= transformToApply.getAlpha(); 2220 mGroupFlags |= FLAG_CLEAR_TRANSFORMATION; 2221 } 2222 } 2223 2224 if (!child.hasIdentityMatrix()) { 2225 canvas.translate(-transX, -transY); 2226 canvas.concat(child.getMatrix()); 2227 canvas.translate(transX, transY); 2228 } 2229 2230 if (alpha < 1.0f) { 2231 mGroupFlags |= FLAG_CLEAR_TRANSFORMATION; 2232 2233 if (hasNoCache) { 2234 final int multipliedAlpha = (int) (255 * alpha); 2235 if (!child.onSetAlpha(multipliedAlpha)) { 2236 int layerFlags = Canvas.HAS_ALPHA_LAYER_SAVE_FLAG; 2237 if ((flags & FLAG_CLIP_CHILDREN) == FLAG_CLIP_CHILDREN) { 2238 layerFlags |= Canvas.CLIP_TO_LAYER_SAVE_FLAG; 2239 } 2240 canvas.saveLayerAlpha(sx, sy, sx + cr - cl, sy + cb - ct, multipliedAlpha, 2241 layerFlags); 2242 } else { 2243 child.mPrivateFlags |= ALPHA_SET; 2244 } 2245 } 2246 } 2247 } else if ((child.mPrivateFlags & ALPHA_SET) == ALPHA_SET) { 2248 child.onSetAlpha(255); 2249 child.mPrivateFlags &= ~ALPHA_SET; 2250 } 2251 2252 if ((flags & FLAG_CLIP_CHILDREN) == FLAG_CLIP_CHILDREN) { 2253 if (hasNoCache) { 2254 canvas.clipRect(sx, sy, sx + (cr - cl), sy + (cb - ct)); 2255 } else { 2256 if (!scalingRequired) { 2257 canvas.clipRect(0, 0, cr - cl, cb - ct); 2258 } else { 2259 canvas.clipRect(0, 0, cache.getWidth(), cache.getHeight()); 2260 } 2261 } 2262 } 2263 2264 if (hasNoCache) { 2265 if (!hasDisplayList) { 2266 // Fast path for layouts with no backgrounds 2267 if ((child.mPrivateFlags & SKIP_DRAW) == SKIP_DRAW) { 2268 if (ViewDebug.TRACE_HIERARCHY) { 2269 ViewDebug.trace(this, ViewDebug.HierarchyTraceType.DRAW); 2270 } 2271 child.mPrivateFlags &= ~DIRTY_MASK; 2272 child.dispatchDraw(canvas); 2273 } else { 2274 child.draw(canvas); 2275 } 2276 } else { 2277 ((HardwareCanvas) canvas).drawDisplayList(displayList); 2278 } 2279 } else if (cache != null) { 2280 final Paint cachePaint = mCachePaint; 2281 if (alpha < 1.0f) { 2282 cachePaint.setAlpha((int) (alpha * 255)); 2283 mGroupFlags |= FLAG_ALPHA_LOWER_THAN_ONE; 2284 } else if ((flags & FLAG_ALPHA_LOWER_THAN_ONE) == FLAG_ALPHA_LOWER_THAN_ONE) { 2285 cachePaint.setAlpha(255); 2286 mGroupFlags &= ~FLAG_ALPHA_LOWER_THAN_ONE; 2287 } 2288 canvas.drawBitmap(cache, 0.0f, 0.0f, cachePaint); 2289 } 2290 2291 canvas.restoreToCount(restoreTo); 2292 2293 if (a != null && !more) { 2294 child.onSetAlpha(255); 2295 finishAnimatingView(child, a); 2296 } 2297 2298 return more; 2299 } 2300 2301 /** 2302 * By default, children are clipped to their bounds before drawing. This 2303 * allows view groups to override this behavior for animations, etc. 2304 * 2305 * @param clipChildren true to clip children to their bounds, 2306 * false otherwise 2307 * @attr ref android.R.styleable#ViewGroup_clipChildren 2308 */ 2309 public void setClipChildren(boolean clipChildren) { 2310 setBooleanFlag(FLAG_CLIP_CHILDREN, clipChildren); 2311 } 2312 2313 /** 2314 * By default, children are clipped to the padding of the ViewGroup. This 2315 * allows view groups to override this behavior 2316 * 2317 * @param clipToPadding true to clip children to the padding of the 2318 * group, false otherwise 2319 * @attr ref android.R.styleable#ViewGroup_clipToPadding 2320 */ 2321 public void setClipToPadding(boolean clipToPadding) { 2322 setBooleanFlag(FLAG_CLIP_TO_PADDING, clipToPadding); 2323 } 2324 2325 /** 2326 * {@inheritDoc} 2327 */ 2328 @Override 2329 public void dispatchSetSelected(boolean selected) { 2330 final View[] children = mChildren; 2331 final int count = mChildrenCount; 2332 for (int i = 0; i < count; i++) { 2333 2334 children[i].setSelected(selected); 2335 } 2336 } 2337 2338 /** 2339 * {@inheritDoc} 2340 */ 2341 @Override 2342 public void dispatchSetActivated(boolean activated) { 2343 final View[] children = mChildren; 2344 final int count = mChildrenCount; 2345 for (int i = 0; i < count; i++) { 2346 2347 children[i].setActivated(activated); 2348 } 2349 } 2350 2351 @Override 2352 protected void dispatchSetPressed(boolean pressed) { 2353 final View[] children = mChildren; 2354 final int count = mChildrenCount; 2355 for (int i = 0; i < count; i++) { 2356 children[i].setPressed(pressed); 2357 } 2358 } 2359 2360 /** 2361 * When this property is set to true, this ViewGroup supports static transformations on 2362 * children; this causes 2363 * {@link #getChildStaticTransformation(View, android.view.animation.Transformation)} to be 2364 * invoked when a child is drawn. 2365 * 2366 * Any subclass overriding 2367 * {@link #getChildStaticTransformation(View, android.view.animation.Transformation)} should 2368 * set this property to true. 2369 * 2370 * @param enabled True to enable static transformations on children, false otherwise. 2371 * 2372 * @see #FLAG_SUPPORT_STATIC_TRANSFORMATIONS 2373 */ 2374 protected void setStaticTransformationsEnabled(boolean enabled) { 2375 setBooleanFlag(FLAG_SUPPORT_STATIC_TRANSFORMATIONS, enabled); 2376 } 2377 2378 /** 2379 * {@inheritDoc} 2380 * 2381 * @see #setStaticTransformationsEnabled(boolean) 2382 */ 2383 protected boolean getChildStaticTransformation(View child, Transformation t) { 2384 return false; 2385 } 2386 2387 /** 2388 * {@hide} 2389 */ 2390 @Override 2391 protected View findViewTraversal(int id) { 2392 if (id == mID) { 2393 return this; 2394 } 2395 2396 final View[] where = mChildren; 2397 final int len = mChildrenCount; 2398 2399 for (int i = 0; i < len; i++) { 2400 View v = where[i]; 2401 2402 if ((v.mPrivateFlags & IS_ROOT_NAMESPACE) == 0) { 2403 v = v.findViewById(id); 2404 2405 if (v != null) { 2406 return v; 2407 } 2408 } 2409 } 2410 2411 return null; 2412 } 2413 2414 /** 2415 * {@hide} 2416 */ 2417 @Override 2418 protected View findViewWithTagTraversal(Object tag) { 2419 if (tag != null && tag.equals(mTag)) { 2420 return this; 2421 } 2422 2423 final View[] where = mChildren; 2424 final int len = mChildrenCount; 2425 2426 for (int i = 0; i < len; i++) { 2427 View v = where[i]; 2428 2429 if ((v.mPrivateFlags & IS_ROOT_NAMESPACE) == 0) { 2430 v = v.findViewWithTag(tag); 2431 2432 if (v != null) { 2433 return v; 2434 } 2435 } 2436 } 2437 2438 return null; 2439 } 2440 2441 /** 2442 * Adds a child view. If no layout parameters are already set on the child, the 2443 * default parameters for this ViewGroup are set on the child. 2444 * 2445 * @param child the child view to add 2446 * 2447 * @see #generateDefaultLayoutParams() 2448 */ 2449 public void addView(View child) { 2450 addView(child, -1); 2451 } 2452 2453 /** 2454 * Adds a child view. If no layout parameters are already set on the child, the 2455 * default parameters for this ViewGroup are set on the child. 2456 * 2457 * @param child the child view to add 2458 * @param index the position at which to add the child 2459 * 2460 * @see #generateDefaultLayoutParams() 2461 */ 2462 public void addView(View child, int index) { 2463 LayoutParams params = child.getLayoutParams(); 2464 if (params == null) { 2465 params = generateDefaultLayoutParams(); 2466 if (params == null) { 2467 throw new IllegalArgumentException("generateDefaultLayoutParams() cannot return null"); 2468 } 2469 } 2470 addView(child, index, params); 2471 } 2472 2473 /** 2474 * Adds a child view with this ViewGroup's default layout parameters and the 2475 * specified width and height. 2476 * 2477 * @param child the child view to add 2478 */ 2479 public void addView(View child, int width, int height) { 2480 final LayoutParams params = generateDefaultLayoutParams(); 2481 params.width = width; 2482 params.height = height; 2483 addView(child, -1, params); 2484 } 2485 2486 /** 2487 * Adds a child view with the specified layout parameters. 2488 * 2489 * @param child the child view to add 2490 * @param params the layout parameters to set on the child 2491 */ 2492 public void addView(View child, LayoutParams params) { 2493 addView(child, -1, params); 2494 } 2495 2496 /** 2497 * Adds a child view with the specified layout parameters. 2498 * 2499 * @param child the child view to add 2500 * @param index the position at which to add the child 2501 * @param params the layout parameters to set on the child 2502 */ 2503 public void addView(View child, int index, LayoutParams params) { 2504 if (DBG) { 2505 System.out.println(this + " addView"); 2506 } 2507 2508 // addViewInner() will call child.requestLayout() when setting the new LayoutParams 2509 // therefore, we call requestLayout() on ourselves before, so that the child's request 2510 // will be blocked at our level 2511 requestLayout(); 2512 invalidate(); 2513 addViewInner(child, index, params, false); 2514 } 2515 2516 /** 2517 * {@inheritDoc} 2518 */ 2519 public void updateViewLayout(View view, ViewGroup.LayoutParams params) { 2520 if (!checkLayoutParams(params)) { 2521 throw new IllegalArgumentException("Invalid LayoutParams supplied to " + this); 2522 } 2523 if (view.mParent != this) { 2524 throw new IllegalArgumentException("Given view not a child of " + this); 2525 } 2526 view.setLayoutParams(params); 2527 } 2528 2529 /** 2530 * {@inheritDoc} 2531 */ 2532 protected boolean checkLayoutParams(ViewGroup.LayoutParams p) { 2533 return p != null; 2534 } 2535 2536 /** 2537 * Interface definition for a callback to be invoked when the hierarchy 2538 * within this view changed. The hierarchy changes whenever a child is added 2539 * to or removed from this view. 2540 */ 2541 public interface OnHierarchyChangeListener { 2542 /** 2543 * Called when a new child is added to a parent view. 2544 * 2545 * @param parent the view in which a child was added 2546 * @param child the new child view added in the hierarchy 2547 */ 2548 void onChildViewAdded(View parent, View child); 2549 2550 /** 2551 * Called when a child is removed from a parent view. 2552 * 2553 * @param parent the view from which the child was removed 2554 * @param child the child removed from the hierarchy 2555 */ 2556 void onChildViewRemoved(View parent, View child); 2557 } 2558 2559 /** 2560 * Register a callback to be invoked when a child is added to or removed 2561 * from this view. 2562 * 2563 * @param listener the callback to invoke on hierarchy change 2564 */ 2565 public void setOnHierarchyChangeListener(OnHierarchyChangeListener listener) { 2566 mOnHierarchyChangeListener = listener; 2567 } 2568 2569 /** 2570 * Adds a view during layout. This is useful if in your onLayout() method, 2571 * you need to add more views (as does the list view for example). 2572 * 2573 * If index is negative, it means put it at the end of the list. 2574 * 2575 * @param child the view to add to the group 2576 * @param index the index at which the child must be added 2577 * @param params the layout parameters to associate with the child 2578 * @return true if the child was added, false otherwise 2579 */ 2580 protected boolean addViewInLayout(View child, int index, LayoutParams params) { 2581 return addViewInLayout(child, index, params, false); 2582 } 2583 2584 /** 2585 * Adds a view during layout. This is useful if in your onLayout() method, 2586 * you need to add more views (as does the list view for example). 2587 * 2588 * If index is negative, it means put it at the end of the list. 2589 * 2590 * @param child the view to add to the group 2591 * @param index the index at which the child must be added 2592 * @param params the layout parameters to associate with the child 2593 * @param preventRequestLayout if true, calling this method will not trigger a 2594 * layout request on child 2595 * @return true if the child was added, false otherwise 2596 */ 2597 protected boolean addViewInLayout(View child, int index, LayoutParams params, 2598 boolean preventRequestLayout) { 2599 child.mParent = null; 2600 addViewInner(child, index, params, preventRequestLayout); 2601 child.mPrivateFlags = (child.mPrivateFlags & ~DIRTY_MASK) | DRAWN; 2602 return true; 2603 } 2604 2605 /** 2606 * Prevents the specified child to be laid out during the next layout pass. 2607 * 2608 * @param child the child on which to perform the cleanup 2609 */ 2610 protected void cleanupLayoutState(View child) { 2611 child.mPrivateFlags &= ~View.FORCE_LAYOUT; 2612 } 2613 2614 private void addViewInner(View child, int index, LayoutParams params, 2615 boolean preventRequestLayout) { 2616 2617 if (child.getParent() != null) { 2618 throw new IllegalStateException("The specified child already has a parent. " + 2619 "You must call removeView() on the child's parent first."); 2620 } 2621 2622 if (mTransition != null) { 2623 mTransition.addChild(this, child); 2624 } 2625 2626 if (!checkLayoutParams(params)) { 2627 params = generateLayoutParams(params); 2628 } 2629 2630 if (preventRequestLayout) { 2631 child.mLayoutParams = params; 2632 } else { 2633 child.setLayoutParams(params); 2634 } 2635 2636 if (index < 0) { 2637 index = mChildrenCount; 2638 } 2639 2640 addInArray(child, index); 2641 2642 // tell our children 2643 if (preventRequestLayout) { 2644 child.assignParent(this); 2645 } else { 2646 child.mParent = this; 2647 } 2648 2649 if (child.hasFocus()) { 2650 requestChildFocus(child, child.findFocus()); 2651 } 2652 2653 AttachInfo ai = mAttachInfo; 2654 if (ai != null) { 2655 boolean lastKeepOn = ai.mKeepScreenOn; 2656 ai.mKeepScreenOn = false; 2657 child.dispatchAttachedToWindow(mAttachInfo, (mViewFlags&VISIBILITY_MASK)); 2658 if (ai.mKeepScreenOn) { 2659 needGlobalAttributesUpdate(true); 2660 } 2661 ai.mKeepScreenOn = lastKeepOn; 2662 } 2663 2664 if (mOnHierarchyChangeListener != null) { 2665 mOnHierarchyChangeListener.onChildViewAdded(this, child); 2666 } 2667 2668 if ((child.mViewFlags & DUPLICATE_PARENT_STATE) == DUPLICATE_PARENT_STATE) { 2669 mGroupFlags |= FLAG_NOTIFY_CHILDREN_ON_DRAWABLE_STATE_CHANGE; 2670 } 2671 } 2672 2673 private void addInArray(View child, int index) { 2674 View[] children = mChildren; 2675 final int count = mChildrenCount; 2676 final int size = children.length; 2677 if (index == count) { 2678 if (size == count) { 2679 mChildren = new View[size + ARRAY_CAPACITY_INCREMENT]; 2680 System.arraycopy(children, 0, mChildren, 0, size); 2681 children = mChildren; 2682 } 2683 children[mChildrenCount++] = child; 2684 } else if (index < count) { 2685 if (size == count) { 2686 mChildren = new View[size + ARRAY_CAPACITY_INCREMENT]; 2687 System.arraycopy(children, 0, mChildren, 0, index); 2688 System.arraycopy(children, index, mChildren, index + 1, count - index); 2689 children = mChildren; 2690 } else { 2691 System.arraycopy(children, index, children, index + 1, count - index); 2692 } 2693 children[index] = child; 2694 mChildrenCount++; 2695 } else { 2696 throw new IndexOutOfBoundsException("index=" + index + " count=" + count); 2697 } 2698 } 2699 2700 // This method also sets the child's mParent to null 2701 private void removeFromArray(int index) { 2702 final View[] children = mChildren; 2703 if (!(mTransitioningViews != null && mTransitioningViews.contains(children[index]))) { 2704 children[index].mParent = null; 2705 } 2706 final int count = mChildrenCount; 2707 if (index == count - 1) { 2708 children[--mChildrenCount] = null; 2709 } else if (index >= 0 && index < count) { 2710 System.arraycopy(children, index + 1, children, index, count - index - 1); 2711 children[--mChildrenCount] = null; 2712 } else { 2713 throw new IndexOutOfBoundsException(); 2714 } 2715 } 2716 2717 // This method also sets the children's mParent to null 2718 private void removeFromArray(int start, int count) { 2719 final View[] children = mChildren; 2720 final int childrenCount = mChildrenCount; 2721 2722 start = Math.max(0, start); 2723 final int end = Math.min(childrenCount, start + count); 2724 2725 if (start == end) { 2726 return; 2727 } 2728 2729 if (end == childrenCount) { 2730 for (int i = start; i < end; i++) { 2731 children[i].mParent = null; 2732 children[i] = null; 2733 } 2734 } else { 2735 for (int i = start; i < end; i++) { 2736 children[i].mParent = null; 2737 } 2738 2739 // Since we're looping above, we might as well do the copy, but is arraycopy() 2740 // faster than the extra 2 bounds checks we would do in the loop? 2741 System.arraycopy(children, end, children, start, childrenCount - end); 2742 2743 for (int i = childrenCount - (end - start); i < childrenCount; i++) { 2744 children[i] = null; 2745 } 2746 } 2747 2748 mChildrenCount -= (end - start); 2749 } 2750 2751 private void bindLayoutAnimation(View child) { 2752 Animation a = mLayoutAnimationController.getAnimationForView(child); 2753 child.setAnimation(a); 2754 } 2755 2756 /** 2757 * Subclasses should override this method to set layout animation 2758 * parameters on the supplied child. 2759 * 2760 * @param child the child to associate with animation parameters 2761 * @param params the child's layout parameters which hold the animation 2762 * parameters 2763 * @param index the index of the child in the view group 2764 * @param count the number of children in the view group 2765 */ 2766 protected void attachLayoutAnimationParameters(View child, 2767 LayoutParams params, int index, int count) { 2768 LayoutAnimationController.AnimationParameters animationParams = 2769 params.layoutAnimationParameters; 2770 if (animationParams == null) { 2771 animationParams = new LayoutAnimationController.AnimationParameters(); 2772 params.layoutAnimationParameters = animationParams; 2773 } 2774 2775 animationParams.count = count; 2776 animationParams.index = index; 2777 } 2778 2779 /** 2780 * {@inheritDoc} 2781 */ 2782 public void removeView(View view) { 2783 removeViewInternal(view); 2784 requestLayout(); 2785 invalidate(); 2786 } 2787 2788 /** 2789 * Removes a view during layout. This is useful if in your onLayout() method, 2790 * you need to remove more views. 2791 * 2792 * @param view the view to remove from the group 2793 */ 2794 public void removeViewInLayout(View view) { 2795 removeViewInternal(view); 2796 } 2797 2798 /** 2799 * Removes a range of views during layout. This is useful if in your onLayout() method, 2800 * you need to remove more views. 2801 * 2802 * @param start the index of the first view to remove from the group 2803 * @param count the number of views to remove from the group 2804 */ 2805 public void removeViewsInLayout(int start, int count) { 2806 removeViewsInternal(start, count); 2807 } 2808 2809 /** 2810 * Removes the view at the specified position in the group. 2811 * 2812 * @param index the position in the group of the view to remove 2813 */ 2814 public void removeViewAt(int index) { 2815 removeViewInternal(index, getChildAt(index)); 2816 requestLayout(); 2817 invalidate(); 2818 } 2819 2820 /** 2821 * Removes the specified range of views from the group. 2822 * 2823 * @param start the first position in the group of the range of views to remove 2824 * @param count the number of views to remove 2825 */ 2826 public void removeViews(int start, int count) { 2827 removeViewsInternal(start, count); 2828 requestLayout(); 2829 invalidate(); 2830 } 2831 2832 private void removeViewInternal(View view) { 2833 final int index = indexOfChild(view); 2834 if (index >= 0) { 2835 removeViewInternal(index, view); 2836 } 2837 } 2838 2839 private void removeViewInternal(int index, View view) { 2840 2841 if (mTransition != null) { 2842 mTransition.removeChild(this, view); 2843 } 2844 2845 boolean clearChildFocus = false; 2846 if (view == mFocused) { 2847 view.clearFocusForRemoval(); 2848 clearChildFocus = true; 2849 } 2850 2851 if (view.getAnimation() != null || 2852 (mTransitioningViews != null && mTransitioningViews.contains(view))) { 2853 addDisappearingView(view); 2854 } else if (view.mAttachInfo != null) { 2855 view.dispatchDetachedFromWindow(); 2856 } 2857 2858 if (mOnHierarchyChangeListener != null) { 2859 mOnHierarchyChangeListener.onChildViewRemoved(this, view); 2860 } 2861 2862 needGlobalAttributesUpdate(false); 2863 2864 removeFromArray(index); 2865 2866 if (clearChildFocus) { 2867 clearChildFocus(view); 2868 } 2869 } 2870 2871 /** 2872 * Sets the LayoutTransition object for this ViewGroup. If the LayoutTransition object is 2873 * not null, changes in layout which occur because of children being added to or removed from 2874 * the ViewGroup will be animated according to the animations defined in that LayoutTransition 2875 * object. By default, the transition object is null (so layout changes are not animated). 2876 * 2877 * @param transition The LayoutTransition object that will animated changes in layout. A value 2878 * of <code>null</code> means no transition will run on layout changes. 2879 * @attr ref android.R.styleable#ViewGroup_animateLayoutChanges 2880 */ 2881 public void setLayoutTransition(LayoutTransition transition) { 2882 if (mTransition != null) { 2883 mTransition.removeTransitionListener(mLayoutTransitionListener); 2884 } 2885 mTransition = transition; 2886 if (mTransition != null) { 2887 mTransition.addTransitionListener(mLayoutTransitionListener); 2888 } 2889 } 2890 2891 /** 2892 * Gets the LayoutTransition object for this ViewGroup. If the LayoutTransition object is 2893 * not null, changes in layout which occur because of children being added to or removed from 2894 * the ViewGroup will be animated according to the animations defined in that LayoutTransition 2895 * object. By default, the transition object is null (so layout changes are not animated). 2896 * 2897 * @return LayoutTranstion The LayoutTransition object that will animated changes in layout. 2898 * A value of <code>null</code> means no transition will run on layout changes. 2899 */ 2900 public LayoutTransition getLayoutTransition() { 2901 return mTransition; 2902 } 2903 2904 private void removeViewsInternal(int start, int count) { 2905 final OnHierarchyChangeListener onHierarchyChangeListener = mOnHierarchyChangeListener; 2906 final boolean notifyListener = onHierarchyChangeListener != null; 2907 final View focused = mFocused; 2908 final boolean detach = mAttachInfo != null; 2909 View clearChildFocus = null; 2910 2911 final View[] children = mChildren; 2912 final int end = start + count; 2913 2914 for (int i = start; i < end; i++) { 2915 final View view = children[i]; 2916 2917 if (mTransition != null) { 2918 mTransition.removeChild(this, view); 2919 } 2920 2921 if (view == focused) { 2922 view.clearFocusForRemoval(); 2923 clearChildFocus = view; 2924 } 2925 2926 if (view.getAnimation() != null || 2927 (mTransitioningViews != null && mTransitioningViews.contains(view))) { 2928 addDisappearingView(view); 2929 } else if (detach) { 2930 view.dispatchDetachedFromWindow(); 2931 } 2932 2933 needGlobalAttributesUpdate(false); 2934 2935 if (notifyListener) { 2936 onHierarchyChangeListener.onChildViewRemoved(this, view); 2937 } 2938 } 2939 2940 removeFromArray(start, count); 2941 2942 if (clearChildFocus != null) { 2943 clearChildFocus(clearChildFocus); 2944 } 2945 } 2946 2947 /** 2948 * Call this method to remove all child views from the 2949 * ViewGroup. 2950 */ 2951 public void removeAllViews() { 2952 removeAllViewsInLayout(); 2953 requestLayout(); 2954 invalidate(); 2955 } 2956 2957 /** 2958 * Called by a ViewGroup subclass to remove child views from itself, 2959 * when it must first know its size on screen before it can calculate how many 2960 * child views it will render. An example is a Gallery or a ListView, which 2961 * may "have" 50 children, but actually only render the number of children 2962 * that can currently fit inside the object on screen. Do not call 2963 * this method unless you are extending ViewGroup and understand the 2964 * view measuring and layout pipeline. 2965 */ 2966 public void removeAllViewsInLayout() { 2967 final int count = mChildrenCount; 2968 if (count <= 0) { 2969 return; 2970 } 2971 2972 final View[] children = mChildren; 2973 mChildrenCount = 0; 2974 2975 final OnHierarchyChangeListener listener = mOnHierarchyChangeListener; 2976 final boolean notify = listener != null; 2977 final View focused = mFocused; 2978 final boolean detach = mAttachInfo != null; 2979 View clearChildFocus = null; 2980 2981 needGlobalAttributesUpdate(false); 2982 2983 for (int i = count - 1; i >= 0; i--) { 2984 final View view = children[i]; 2985 2986 if (mTransition != null) { 2987 mTransition.removeChild(this, view); 2988 } 2989 2990 if (view == focused) { 2991 view.clearFocusForRemoval(); 2992 clearChildFocus = view; 2993 } 2994 2995 if (view.getAnimation() != null || 2996 (mTransitioningViews != null && mTransitioningViews.contains(view))) { 2997 addDisappearingView(view); 2998 } else if (detach) { 2999 view.dispatchDetachedFromWindow(); 3000 } 3001 3002 if (notify) { 3003 listener.onChildViewRemoved(this, view); 3004 } 3005 3006 view.mParent = null; 3007 children[i] = null; 3008 } 3009 3010 if (clearChildFocus != null) { 3011 clearChildFocus(clearChildFocus); 3012 } 3013 } 3014 3015 /** 3016 * Finishes the removal of a detached view. This method will dispatch the detached from 3017 * window event and notify the hierarchy change listener. 3018 * 3019 * @param child the child to be definitely removed from the view hierarchy 3020 * @param animate if true and the view has an animation, the view is placed in the 3021 * disappearing views list, otherwise, it is detached from the window 3022 * 3023 * @see #attachViewToParent(View, int, android.view.ViewGroup.LayoutParams) 3024 * @see #detachAllViewsFromParent() 3025 * @see #detachViewFromParent(View) 3026 * @see #detachViewFromParent(int) 3027 */ 3028 protected void removeDetachedView(View child, boolean animate) { 3029 if (mTransition != null) { 3030 mTransition.removeChild(this, child); 3031 } 3032 3033 if (child == mFocused) { 3034 child.clearFocus(); 3035 } 3036 3037 if ((animate && child.getAnimation() != null) || 3038 (mTransitioningViews != null && mTransitioningViews.contains(child))) { 3039 addDisappearingView(child); 3040 } else if (child.mAttachInfo != null) { 3041 child.dispatchDetachedFromWindow(); 3042 } 3043 3044 if (mOnHierarchyChangeListener != null) { 3045 mOnHierarchyChangeListener.onChildViewRemoved(this, child); 3046 } 3047 } 3048 3049 /** 3050 * Attaches a view to this view group. Attaching a view assigns this group as the parent, 3051 * sets the layout parameters and puts the view in the list of children so it can be retrieved 3052 * by calling {@link #getChildAt(int)}. 3053 * 3054 * This method should be called only for view which were detached from their parent. 3055 * 3056 * @param child the child to attach 3057 * @param index the index at which the child should be attached 3058 * @param params the layout parameters of the child 3059 * 3060 * @see #removeDetachedView(View, boolean) 3061 * @see #detachAllViewsFromParent() 3062 * @see #detachViewFromParent(View) 3063 * @see #detachViewFromParent(int) 3064 */ 3065 protected void attachViewToParent(View child, int index, LayoutParams params) { 3066 child.mLayoutParams = params; 3067 3068 if (index < 0) { 3069 index = mChildrenCount; 3070 } 3071 3072 addInArray(child, index); 3073 3074 child.mParent = this; 3075 child.mPrivateFlags = (child.mPrivateFlags & ~DIRTY_MASK & ~DRAWING_CACHE_VALID) | DRAWN; 3076 3077 if (child.hasFocus()) { 3078 requestChildFocus(child, child.findFocus()); 3079 } 3080 } 3081 3082 /** 3083 * Detaches a view from its parent. Detaching a view should be temporary and followed 3084 * either by a call to {@link #attachViewToParent(View, int, android.view.ViewGroup.LayoutParams)} 3085 * or a call to {@link #removeDetachedView(View, boolean)}. When a view is detached, 3086 * its parent is null and cannot be retrieved by a call to {@link #getChildAt(int)}. 3087 * 3088 * @param child the child to detach 3089 * 3090 * @see #detachViewFromParent(int) 3091 * @see #detachViewsFromParent(int, int) 3092 * @see #detachAllViewsFromParent() 3093 * @see #attachViewToParent(View, int, android.view.ViewGroup.LayoutParams) 3094 * @see #removeDetachedView(View, boolean) 3095 */ 3096 protected void detachViewFromParent(View child) { 3097 removeFromArray(indexOfChild(child)); 3098 } 3099 3100 /** 3101 * Detaches a view from its parent. Detaching a view should be temporary and followed 3102 * either by a call to {@link #attachViewToParent(View, int, android.view.ViewGroup.LayoutParams)} 3103 * or a call to {@link #removeDetachedView(View, boolean)}. When a view is detached, 3104 * its parent is null and cannot be retrieved by a call to {@link #getChildAt(int)}. 3105 * 3106 * @param index the index of the child to detach 3107 * 3108 * @see #detachViewFromParent(View) 3109 * @see #detachAllViewsFromParent() 3110 * @see #detachViewsFromParent(int, int) 3111 * @see #attachViewToParent(View, int, android.view.ViewGroup.LayoutParams) 3112 * @see #removeDetachedView(View, boolean) 3113 */ 3114 protected void detachViewFromParent(int index) { 3115 removeFromArray(index); 3116 } 3117 3118 /** 3119 * Detaches a range of view from their parent. Detaching a view should be temporary and followed 3120 * either by a call to {@link #attachViewToParent(View, int, android.view.ViewGroup.LayoutParams)} 3121 * or a call to {@link #removeDetachedView(View, boolean)}. When a view is detached, its 3122 * parent is null and cannot be retrieved by a call to {@link #getChildAt(int)}. 3123 * 3124 * @param start the first index of the childrend range to detach 3125 * @param count the number of children to detach 3126 * 3127 * @see #detachViewFromParent(View) 3128 * @see #detachViewFromParent(int) 3129 * @see #detachAllViewsFromParent() 3130 * @see #attachViewToParent(View, int, android.view.ViewGroup.LayoutParams) 3131 * @see #removeDetachedView(View, boolean) 3132 */ 3133 protected void detachViewsFromParent(int start, int count) { 3134 removeFromArray(start, count); 3135 } 3136 3137 /** 3138 * Detaches all views from the parent. Detaching a view should be temporary and followed 3139 * either by a call to {@link #attachViewToParent(View, int, android.view.ViewGroup.LayoutParams)} 3140 * or a call to {@link #removeDetachedView(View, boolean)}. When a view is detached, 3141 * its parent is null and cannot be retrieved by a call to {@link #getChildAt(int)}. 3142 * 3143 * @see #detachViewFromParent(View) 3144 * @see #detachViewFromParent(int) 3145 * @see #detachViewsFromParent(int, int) 3146 * @see #attachViewToParent(View, int, android.view.ViewGroup.LayoutParams) 3147 * @see #removeDetachedView(View, boolean) 3148 */ 3149 protected void detachAllViewsFromParent() { 3150 final int count = mChildrenCount; 3151 if (count <= 0) { 3152 return; 3153 } 3154 3155 final View[] children = mChildren; 3156 mChildrenCount = 0; 3157 3158 for (int i = count - 1; i >= 0; i--) { 3159 children[i].mParent = null; 3160 children[i] = null; 3161 } 3162 } 3163 3164 /** 3165 * Don't call or override this method. It is used for the implementation of 3166 * the view hierarchy. 3167 */ 3168 public final void invalidateChild(View child, final Rect dirty) { 3169 if (ViewDebug.TRACE_HIERARCHY) { 3170 ViewDebug.trace(this, ViewDebug.HierarchyTraceType.INVALIDATE_CHILD); 3171 } 3172 3173 ViewParent parent = this; 3174 3175 final AttachInfo attachInfo = mAttachInfo; 3176 if (attachInfo != null) { 3177 final int[] location = attachInfo.mInvalidateChildLocation; 3178 location[CHILD_LEFT_INDEX] = child.mLeft; 3179 location[CHILD_TOP_INDEX] = child.mTop; 3180 Matrix childMatrix = child.getMatrix(); 3181 if (!childMatrix.isIdentity()) { 3182 RectF boundingRect = attachInfo.mTmpTransformRect; 3183 boundingRect.set(dirty); 3184 childMatrix.mapRect(boundingRect); 3185 dirty.set((int) boundingRect.left, (int) boundingRect.top, 3186 (int) (boundingRect.right + 0.5f), 3187 (int) (boundingRect.bottom + 0.5f)); 3188 } 3189 3190 // If the child is drawing an animation, we want to copy this flag onto 3191 // ourselves and the parent to make sure the invalidate request goes 3192 // through 3193 final boolean drawAnimation = (child.mPrivateFlags & DRAW_ANIMATION) == DRAW_ANIMATION; 3194 3195 // Check whether the child that requests the invalidate is fully opaque 3196 final boolean isOpaque = child.isOpaque() && !drawAnimation && 3197 child.getAnimation() != null; 3198 // Mark the child as dirty, using the appropriate flag 3199 // Make sure we do not set both flags at the same time 3200 final int opaqueFlag = isOpaque ? DIRTY_OPAQUE : DIRTY; 3201 3202 do { 3203 View view = null; 3204 if (parent instanceof View) { 3205 view = (View) parent; 3206 } 3207 3208 if (drawAnimation) { 3209 if (view != null) { 3210 view.mPrivateFlags |= DRAW_ANIMATION; 3211 } else if (parent instanceof ViewRoot) { 3212 ((ViewRoot) parent).mIsAnimating = true; 3213 } 3214 } 3215 3216 // If the parent is dirty opaque or not dirty, mark it dirty with the opaque 3217 // flag coming from the child that initiated the invalidate 3218 if (view != null && (view.mPrivateFlags & DIRTY_MASK) != DIRTY) { 3219 view.mPrivateFlags = (view.mPrivateFlags & ~DIRTY_MASK) | opaqueFlag; 3220 } 3221 3222 parent = parent.invalidateChildInParent(location, dirty); 3223 if (view != null) { 3224 // Account for transform on current parent 3225 Matrix m = view.getMatrix(); 3226 if (!m.isIdentity()) { 3227 RectF boundingRect = attachInfo.mTmpTransformRect; 3228 boundingRect.set(dirty); 3229 m.mapRect(boundingRect); 3230 dirty.set((int) boundingRect.left, (int) boundingRect.top, 3231 (int) (boundingRect.right + 0.5f), 3232 (int) (boundingRect.bottom + 0.5f)); 3233 } 3234 } 3235 } while (parent != null); 3236 } 3237 } 3238 3239 /** 3240 * Don't call or override this method. It is used for the implementation of 3241 * the view hierarchy. 3242 * 3243 * This implementation returns null if this ViewGroup does not have a parent, 3244 * if this ViewGroup is already fully invalidated or if the dirty rectangle 3245 * does not intersect with this ViewGroup's bounds. 3246 */ 3247 public ViewParent invalidateChildInParent(final int[] location, final Rect dirty) { 3248 if (ViewDebug.TRACE_HIERARCHY) { 3249 ViewDebug.trace(this, ViewDebug.HierarchyTraceType.INVALIDATE_CHILD_IN_PARENT); 3250 } 3251 3252 if ((mPrivateFlags & DRAWN) == DRAWN) { 3253 if ((mGroupFlags & (FLAG_OPTIMIZE_INVALIDATE | FLAG_ANIMATION_DONE)) != 3254 FLAG_OPTIMIZE_INVALIDATE) { 3255 dirty.offset(location[CHILD_LEFT_INDEX] - mScrollX, 3256 location[CHILD_TOP_INDEX] - mScrollY); 3257 3258 final int left = mLeft; 3259 final int top = mTop; 3260 3261 if (dirty.intersect(0, 0, mRight - left, mBottom - top) || 3262 (mPrivateFlags & DRAW_ANIMATION) == DRAW_ANIMATION) { 3263 mPrivateFlags &= ~DRAWING_CACHE_VALID; 3264 3265 location[CHILD_LEFT_INDEX] = left; 3266 location[CHILD_TOP_INDEX] = top; 3267 3268 return mParent; 3269 } 3270 } else { 3271 mPrivateFlags &= ~DRAWN & ~DRAWING_CACHE_VALID; 3272 3273 location[CHILD_LEFT_INDEX] = mLeft; 3274 location[CHILD_TOP_INDEX] = mTop; 3275 3276 dirty.set(0, 0, mRight - location[CHILD_LEFT_INDEX], 3277 mBottom - location[CHILD_TOP_INDEX]); 3278 3279 return mParent; 3280 } 3281 } 3282 3283 return null; 3284 } 3285 3286 /** 3287 * Offset a rectangle that is in a descendant's coordinate 3288 * space into our coordinate space. 3289 * @param descendant A descendant of this view 3290 * @param rect A rectangle defined in descendant's coordinate space. 3291 */ 3292 public final void offsetDescendantRectToMyCoords(View descendant, Rect rect) { 3293 offsetRectBetweenParentAndChild(descendant, rect, true, false); 3294 } 3295 3296 /** 3297 * Offset a rectangle that is in our coordinate space into an ancestor's 3298 * coordinate space. 3299 * @param descendant A descendant of this view 3300 * @param rect A rectangle defined in descendant's coordinate space. 3301 */ 3302 public final void offsetRectIntoDescendantCoords(View descendant, Rect rect) { 3303 offsetRectBetweenParentAndChild(descendant, rect, false, false); 3304 } 3305 3306 /** 3307 * Helper method that offsets a rect either from parent to descendant or 3308 * descendant to parent. 3309 */ 3310 void offsetRectBetweenParentAndChild(View descendant, Rect rect, 3311 boolean offsetFromChildToParent, boolean clipToBounds) { 3312 3313 // already in the same coord system :) 3314 if (descendant == this) { 3315 return; 3316 } 3317 3318 ViewParent theParent = descendant.mParent; 3319 3320 // search and offset up to the parent 3321 while ((theParent != null) 3322 && (theParent instanceof View) 3323 && (theParent != this)) { 3324 3325 if (offsetFromChildToParent) { 3326 rect.offset(descendant.mLeft - descendant.mScrollX, 3327 descendant.mTop - descendant.mScrollY); 3328 if (clipToBounds) { 3329 View p = (View) theParent; 3330 rect.intersect(0, 0, p.mRight - p.mLeft, p.mBottom - p.mTop); 3331 } 3332 } else { 3333 if (clipToBounds) { 3334 View p = (View) theParent; 3335 rect.intersect(0, 0, p.mRight - p.mLeft, p.mBottom - p.mTop); 3336 } 3337 rect.offset(descendant.mScrollX - descendant.mLeft, 3338 descendant.mScrollY - descendant.mTop); 3339 } 3340 3341 descendant = (View) theParent; 3342 theParent = descendant.mParent; 3343 } 3344 3345 // now that we are up to this view, need to offset one more time 3346 // to get into our coordinate space 3347 if (theParent == this) { 3348 if (offsetFromChildToParent) { 3349 rect.offset(descendant.mLeft - descendant.mScrollX, 3350 descendant.mTop - descendant.mScrollY); 3351 } else { 3352 rect.offset(descendant.mScrollX - descendant.mLeft, 3353 descendant.mScrollY - descendant.mTop); 3354 } 3355 } else { 3356 throw new IllegalArgumentException("parameter must be a descendant of this view"); 3357 } 3358 } 3359 3360 /** 3361 * Offset the vertical location of all children of this view by the specified number of pixels. 3362 * 3363 * @param offset the number of pixels to offset 3364 * 3365 * @hide 3366 */ 3367 public void offsetChildrenTopAndBottom(int offset) { 3368 final int count = mChildrenCount; 3369 final View[] children = mChildren; 3370 3371 for (int i = 0; i < count; i++) { 3372 final View v = children[i]; 3373 v.mTop += offset; 3374 v.mBottom += offset; 3375 } 3376 } 3377 3378 /** 3379 * {@inheritDoc} 3380 */ 3381 public boolean getChildVisibleRect(View child, Rect r, android.graphics.Point offset) { 3382 int dx = child.mLeft - mScrollX; 3383 int dy = child.mTop - mScrollY; 3384 if (offset != null) { 3385 offset.x += dx; 3386 offset.y += dy; 3387 } 3388 r.offset(dx, dy); 3389 return r.intersect(0, 0, mRight - mLeft, mBottom - mTop) && 3390 (mParent == null || mParent.getChildVisibleRect(this, r, offset)); 3391 } 3392 3393 /** 3394 * {@inheritDoc} 3395 */ 3396 @Override 3397 protected abstract void onLayout(boolean changed, 3398 int l, int t, int r, int b); 3399 3400 /** 3401 * Indicates whether the view group has the ability to animate its children 3402 * after the first layout. 3403 * 3404 * @return true if the children can be animated, false otherwise 3405 */ 3406 protected boolean canAnimate() { 3407 return mLayoutAnimationController != null; 3408 } 3409 3410 /** 3411 * Runs the layout animation. Calling this method triggers a relayout of 3412 * this view group. 3413 */ 3414 public void startLayoutAnimation() { 3415 if (mLayoutAnimationController != null) { 3416 mGroupFlags |= FLAG_RUN_ANIMATION; 3417 requestLayout(); 3418 } 3419 } 3420 3421 /** 3422 * Schedules the layout animation to be played after the next layout pass 3423 * of this view group. This can be used to restart the layout animation 3424 * when the content of the view group changes or when the activity is 3425 * paused and resumed. 3426 */ 3427 public void scheduleLayoutAnimation() { 3428 mGroupFlags |= FLAG_RUN_ANIMATION; 3429 } 3430 3431 /** 3432 * Sets the layout animation controller used to animate the group's 3433 * children after the first layout. 3434 * 3435 * @param controller the animation controller 3436 */ 3437 public void setLayoutAnimation(LayoutAnimationController controller) { 3438 mLayoutAnimationController = controller; 3439 if (mLayoutAnimationController != null) { 3440 mGroupFlags |= FLAG_RUN_ANIMATION; 3441 } 3442 } 3443 3444 /** 3445 * Returns the layout animation controller used to animate the group's 3446 * children. 3447 * 3448 * @return the current animation controller 3449 */ 3450 public LayoutAnimationController getLayoutAnimation() { 3451 return mLayoutAnimationController; 3452 } 3453 3454 /** 3455 * Indicates whether the children's drawing cache is used during a layout 3456 * animation. By default, the drawing cache is enabled but this will prevent 3457 * nested layout animations from working. To nest animations, you must disable 3458 * the cache. 3459 * 3460 * @return true if the animation cache is enabled, false otherwise 3461 * 3462 * @see #setAnimationCacheEnabled(boolean) 3463 * @see View#setDrawingCacheEnabled(boolean) 3464 */ 3465 @ViewDebug.ExportedProperty 3466 public boolean isAnimationCacheEnabled() { 3467 return (mGroupFlags & FLAG_ANIMATION_CACHE) == FLAG_ANIMATION_CACHE; 3468 } 3469 3470 /** 3471 * Enables or disables the children's drawing cache during a layout animation. 3472 * By default, the drawing cache is enabled but this will prevent nested 3473 * layout animations from working. To nest animations, you must disable the 3474 * cache. 3475 * 3476 * @param enabled true to enable the animation cache, false otherwise 3477 * 3478 * @see #isAnimationCacheEnabled() 3479 * @see View#setDrawingCacheEnabled(boolean) 3480 */ 3481 public void setAnimationCacheEnabled(boolean enabled) { 3482 setBooleanFlag(FLAG_ANIMATION_CACHE, enabled); 3483 } 3484 3485 /** 3486 * Indicates whether this ViewGroup will always try to draw its children using their 3487 * drawing cache. By default this property is enabled. 3488 * 3489 * @return true if the animation cache is enabled, false otherwise 3490 * 3491 * @see #setAlwaysDrawnWithCacheEnabled(boolean) 3492 * @see #setChildrenDrawnWithCacheEnabled(boolean) 3493 * @see View#setDrawingCacheEnabled(boolean) 3494 */ 3495 @ViewDebug.ExportedProperty(category = "drawing") 3496 public boolean isAlwaysDrawnWithCacheEnabled() { 3497 return (mGroupFlags & FLAG_ALWAYS_DRAWN_WITH_CACHE) == FLAG_ALWAYS_DRAWN_WITH_CACHE; 3498 } 3499 3500 /** 3501 * Indicates whether this ViewGroup will always try to draw its children using their 3502 * drawing cache. This property can be set to true when the cache rendering is 3503 * slightly different from the children's normal rendering. Renderings can be different, 3504 * for instance, when the cache's quality is set to low. 3505 * 3506 * When this property is disabled, the ViewGroup will use the drawing cache of its 3507 * children only when asked to. It's usually the task of subclasses to tell ViewGroup 3508 * when to start using the drawing cache and when to stop using it. 3509 * 3510 * @param always true to always draw with the drawing cache, false otherwise 3511 * 3512 * @see #isAlwaysDrawnWithCacheEnabled() 3513 * @see #setChildrenDrawnWithCacheEnabled(boolean) 3514 * @see View#setDrawingCacheEnabled(boolean) 3515 * @see View#setDrawingCacheQuality(int) 3516 */ 3517 public void setAlwaysDrawnWithCacheEnabled(boolean always) { 3518 setBooleanFlag(FLAG_ALWAYS_DRAWN_WITH_CACHE, always); 3519 } 3520 3521 /** 3522 * Indicates whether the ViewGroup is currently drawing its children using 3523 * their drawing cache. 3524 * 3525 * @return true if children should be drawn with their cache, false otherwise 3526 * 3527 * @see #setAlwaysDrawnWithCacheEnabled(boolean) 3528 * @see #setChildrenDrawnWithCacheEnabled(boolean) 3529 */ 3530 @ViewDebug.ExportedProperty(category = "drawing") 3531 protected boolean isChildrenDrawnWithCacheEnabled() { 3532 return (mGroupFlags & FLAG_CHILDREN_DRAWN_WITH_CACHE) == FLAG_CHILDREN_DRAWN_WITH_CACHE; 3533 } 3534 3535 /** 3536 * Tells the ViewGroup to draw its children using their drawing cache. This property 3537 * is ignored when {@link #isAlwaysDrawnWithCacheEnabled()} is true. A child's drawing cache 3538 * will be used only if it has been enabled. 3539 * 3540 * Subclasses should call this method to start and stop using the drawing cache when 3541 * they perform performance sensitive operations, like scrolling or animating. 3542 * 3543 * @param enabled true if children should be drawn with their cache, false otherwise 3544 * 3545 * @see #setAlwaysDrawnWithCacheEnabled(boolean) 3546 * @see #isChildrenDrawnWithCacheEnabled() 3547 */ 3548 protected void setChildrenDrawnWithCacheEnabled(boolean enabled) { 3549 setBooleanFlag(FLAG_CHILDREN_DRAWN_WITH_CACHE, enabled); 3550 } 3551 3552 /** 3553 * Indicates whether the ViewGroup is drawing its children in the order defined by 3554 * {@link #getChildDrawingOrder(int, int)}. 3555 * 3556 * @return true if children drawing order is defined by {@link #getChildDrawingOrder(int, int)}, 3557 * false otherwise 3558 * 3559 * @see #setChildrenDrawingOrderEnabled(boolean) 3560 * @see #getChildDrawingOrder(int, int) 3561 */ 3562 @ViewDebug.ExportedProperty(category = "drawing") 3563 protected boolean isChildrenDrawingOrderEnabled() { 3564 return (mGroupFlags & FLAG_USE_CHILD_DRAWING_ORDER) == FLAG_USE_CHILD_DRAWING_ORDER; 3565 } 3566 3567 /** 3568 * Tells the ViewGroup whether to draw its children in the order defined by the method 3569 * {@link #getChildDrawingOrder(int, int)}. 3570 * 3571 * @param enabled true if the order of the children when drawing is determined by 3572 * {@link #getChildDrawingOrder(int, int)}, false otherwise 3573 * 3574 * @see #isChildrenDrawingOrderEnabled() 3575 * @see #getChildDrawingOrder(int, int) 3576 */ 3577 protected void setChildrenDrawingOrderEnabled(boolean enabled) { 3578 setBooleanFlag(FLAG_USE_CHILD_DRAWING_ORDER, enabled); 3579 } 3580 3581 private void setBooleanFlag(int flag, boolean value) { 3582 if (value) { 3583 mGroupFlags |= flag; 3584 } else { 3585 mGroupFlags &= ~flag; 3586 } 3587 } 3588 3589 /** 3590 * Returns an integer indicating what types of drawing caches are kept in memory. 3591 * 3592 * @see #setPersistentDrawingCache(int) 3593 * @see #setAnimationCacheEnabled(boolean) 3594 * 3595 * @return one or a combination of {@link #PERSISTENT_NO_CACHE}, 3596 * {@link #PERSISTENT_ANIMATION_CACHE}, {@link #PERSISTENT_SCROLLING_CACHE} 3597 * and {@link #PERSISTENT_ALL_CACHES} 3598 */ 3599 @ViewDebug.ExportedProperty(category = "drawing", mapping = { 3600 @ViewDebug.IntToString(from = PERSISTENT_NO_CACHE, to = "NONE"), 3601 @ViewDebug.IntToString(from = PERSISTENT_ANIMATION_CACHE, to = "ANIMATION"), 3602 @ViewDebug.IntToString(from = PERSISTENT_SCROLLING_CACHE, to = "SCROLLING"), 3603 @ViewDebug.IntToString(from = PERSISTENT_ALL_CACHES, to = "ALL") 3604 }) 3605 public int getPersistentDrawingCache() { 3606 return mPersistentDrawingCache; 3607 } 3608 3609 /** 3610 * Indicates what types of drawing caches should be kept in memory after 3611 * they have been created. 3612 * 3613 * @see #getPersistentDrawingCache() 3614 * @see #setAnimationCacheEnabled(boolean) 3615 * 3616 * @param drawingCacheToKeep one or a combination of {@link #PERSISTENT_NO_CACHE}, 3617 * {@link #PERSISTENT_ANIMATION_CACHE}, {@link #PERSISTENT_SCROLLING_CACHE} 3618 * and {@link #PERSISTENT_ALL_CACHES} 3619 */ 3620 public void setPersistentDrawingCache(int drawingCacheToKeep) { 3621 mPersistentDrawingCache = drawingCacheToKeep & PERSISTENT_ALL_CACHES; 3622 } 3623 3624 /** 3625 * Returns a new set of layout parameters based on the supplied attributes set. 3626 * 3627 * @param attrs the attributes to build the layout parameters from 3628 * 3629 * @return an instance of {@link android.view.ViewGroup.LayoutParams} or one 3630 * of its descendants 3631 */ 3632 public LayoutParams generateLayoutParams(AttributeSet attrs) { 3633 return new LayoutParams(getContext(), attrs); 3634 } 3635 3636 /** 3637 * Returns a safe set of layout parameters based on the supplied layout params. 3638 * When a ViewGroup is passed a View whose layout params do not pass the test of 3639 * {@link #checkLayoutParams(android.view.ViewGroup.LayoutParams)}, this method 3640 * is invoked. This method should return a new set of layout params suitable for 3641 * this ViewGroup, possibly by copying the appropriate attributes from the 3642 * specified set of layout params. 3643 * 3644 * @param p The layout parameters to convert into a suitable set of layout parameters 3645 * for this ViewGroup. 3646 * 3647 * @return an instance of {@link android.view.ViewGroup.LayoutParams} or one 3648 * of its descendants 3649 */ 3650 protected LayoutParams generateLayoutParams(ViewGroup.LayoutParams p) { 3651 return p; 3652 } 3653 3654 /** 3655 * Returns a set of default layout parameters. These parameters are requested 3656 * when the View passed to {@link #addView(View)} has no layout parameters 3657 * already set. If null is returned, an exception is thrown from addView. 3658 * 3659 * @return a set of default layout parameters or null 3660 */ 3661 protected LayoutParams generateDefaultLayoutParams() { 3662 return new LayoutParams(LayoutParams.WRAP_CONTENT, LayoutParams.WRAP_CONTENT); 3663 } 3664 3665 /** 3666 * @hide 3667 */ 3668 @Override 3669 protected boolean dispatchConsistencyCheck(int consistency) { 3670 boolean result = super.dispatchConsistencyCheck(consistency); 3671 3672 final int count = mChildrenCount; 3673 final View[] children = mChildren; 3674 for (int i = 0; i < count; i++) { 3675 if (!children[i].dispatchConsistencyCheck(consistency)) result = false; 3676 } 3677 3678 return result; 3679 } 3680 3681 /** 3682 * @hide 3683 */ 3684 @Override 3685 protected boolean onConsistencyCheck(int consistency) { 3686 boolean result = super.onConsistencyCheck(consistency); 3687 3688 final boolean checkLayout = (consistency & ViewDebug.CONSISTENCY_LAYOUT) != 0; 3689 final boolean checkDrawing = (consistency & ViewDebug.CONSISTENCY_DRAWING) != 0; 3690 3691 if (checkLayout) { 3692 final int count = mChildrenCount; 3693 final View[] children = mChildren; 3694 for (int i = 0; i < count; i++) { 3695 if (children[i].getParent() != this) { 3696 result = false; 3697 android.util.Log.d(ViewDebug.CONSISTENCY_LOG_TAG, 3698 "View " + children[i] + " has no parent/a parent that is not " + this); 3699 } 3700 } 3701 } 3702 3703 if (checkDrawing) { 3704 // If this group is dirty, check that the parent is dirty as well 3705 if ((mPrivateFlags & DIRTY_MASK) != 0) { 3706 final ViewParent parent = getParent(); 3707 if (parent != null && !(parent instanceof ViewRoot)) { 3708 if ((((View) parent).mPrivateFlags & DIRTY_MASK) == 0) { 3709 result = false; 3710 android.util.Log.d(ViewDebug.CONSISTENCY_LOG_TAG, 3711 "ViewGroup " + this + " is dirty but its parent is not: " + this); 3712 } 3713 } 3714 } 3715 } 3716 3717 return result; 3718 } 3719 3720 /** 3721 * {@inheritDoc} 3722 */ 3723 @Override 3724 protected void debug(int depth) { 3725 super.debug(depth); 3726 String output; 3727 3728 if (mFocused != null) { 3729 output = debugIndent(depth); 3730 output += "mFocused"; 3731 Log.d(VIEW_LOG_TAG, output); 3732 } 3733 if (mChildrenCount != 0) { 3734 output = debugIndent(depth); 3735 output += "{"; 3736 Log.d(VIEW_LOG_TAG, output); 3737 } 3738 int count = mChildrenCount; 3739 for (int i = 0; i < count; i++) { 3740 View child = mChildren[i]; 3741 child.debug(depth + 1); 3742 } 3743 3744 if (mChildrenCount != 0) { 3745 output = debugIndent(depth); 3746 output += "}"; 3747 Log.d(VIEW_LOG_TAG, output); 3748 } 3749 } 3750 3751 /** 3752 * Returns the position in the group of the specified child view. 3753 * 3754 * @param child the view for which to get the position 3755 * @return a positive integer representing the position of the view in the 3756 * group, or -1 if the view does not exist in the group 3757 */ 3758 public int indexOfChild(View child) { 3759 final int count = mChildrenCount; 3760 final View[] children = mChildren; 3761 for (int i = 0; i < count; i++) { 3762 if (children[i] == child) { 3763 return i; 3764 } 3765 } 3766 return -1; 3767 } 3768 3769 /** 3770 * Returns the number of children in the group. 3771 * 3772 * @return a positive integer representing the number of children in 3773 * the group 3774 */ 3775 public int getChildCount() { 3776 return mChildrenCount; 3777 } 3778 3779 /** 3780 * Returns the view at the specified position in the group. 3781 * 3782 * @param index the position at which to get the view from 3783 * @return the view at the specified position or null if the position 3784 * does not exist within the group 3785 */ 3786 public View getChildAt(int index) { 3787 try { 3788 return mChildren[index]; 3789 } catch (IndexOutOfBoundsException ex) { 3790 return null; 3791 } 3792 } 3793 3794 /** 3795 * Ask all of the children of this view to measure themselves, taking into 3796 * account both the MeasureSpec requirements for this view and its padding. 3797 * We skip children that are in the GONE state The heavy lifting is done in 3798 * getChildMeasureSpec. 3799 * 3800 * @param widthMeasureSpec The width requirements for this view 3801 * @param heightMeasureSpec The height requirements for this view 3802 */ 3803 protected void measureChildren(int widthMeasureSpec, int heightMeasureSpec) { 3804 final int size = mChildrenCount; 3805 final View[] children = mChildren; 3806 for (int i = 0; i < size; ++i) { 3807 final View child = children[i]; 3808 if ((child.mViewFlags & VISIBILITY_MASK) != GONE) { 3809 measureChild(child, widthMeasureSpec, heightMeasureSpec); 3810 } 3811 } 3812 } 3813 3814 /** 3815 * Ask one of the children of this view to measure itself, taking into 3816 * account both the MeasureSpec requirements for this view and its padding. 3817 * The heavy lifting is done in getChildMeasureSpec. 3818 * 3819 * @param child The child to measure 3820 * @param parentWidthMeasureSpec The width requirements for this view 3821 * @param parentHeightMeasureSpec The height requirements for this view 3822 */ 3823 protected void measureChild(View child, int parentWidthMeasureSpec, 3824 int parentHeightMeasureSpec) { 3825 final LayoutParams lp = child.getLayoutParams(); 3826 3827 final int childWidthMeasureSpec = getChildMeasureSpec(parentWidthMeasureSpec, 3828 mPaddingLeft + mPaddingRight, lp.width); 3829 final int childHeightMeasureSpec = getChildMeasureSpec(parentHeightMeasureSpec, 3830 mPaddingTop + mPaddingBottom, lp.height); 3831 3832 child.measure(childWidthMeasureSpec, childHeightMeasureSpec); 3833 } 3834 3835 /** 3836 * Ask one of the children of this view to measure itself, taking into 3837 * account both the MeasureSpec requirements for this view and its padding 3838 * and margins. The child must have MarginLayoutParams The heavy lifting is 3839 * done in getChildMeasureSpec. 3840 * 3841 * @param child The child to measure 3842 * @param parentWidthMeasureSpec The width requirements for this view 3843 * @param widthUsed Extra space that has been used up by the parent 3844 * horizontally (possibly by other children of the parent) 3845 * @param parentHeightMeasureSpec The height requirements for this view 3846 * @param heightUsed Extra space that has been used up by the parent 3847 * vertically (possibly by other children of the parent) 3848 */ 3849 protected void measureChildWithMargins(View child, 3850 int parentWidthMeasureSpec, int widthUsed, 3851 int parentHeightMeasureSpec, int heightUsed) { 3852 final MarginLayoutParams lp = (MarginLayoutParams) child.getLayoutParams(); 3853 3854 final int childWidthMeasureSpec = getChildMeasureSpec(parentWidthMeasureSpec, 3855 mPaddingLeft + mPaddingRight + lp.leftMargin + lp.rightMargin 3856 + widthUsed, lp.width); 3857 final int childHeightMeasureSpec = getChildMeasureSpec(parentHeightMeasureSpec, 3858 mPaddingTop + mPaddingBottom + lp.topMargin + lp.bottomMargin 3859 + heightUsed, lp.height); 3860 3861 child.measure(childWidthMeasureSpec, childHeightMeasureSpec); 3862 } 3863 3864 /** 3865 * Does the hard part of measureChildren: figuring out the MeasureSpec to 3866 * pass to a particular child. This method figures out the right MeasureSpec 3867 * for one dimension (height or width) of one child view. 3868 * 3869 * The goal is to combine information from our MeasureSpec with the 3870 * LayoutParams of the child to get the best possible results. For example, 3871 * if the this view knows its size (because its MeasureSpec has a mode of 3872 * EXACTLY), and the child has indicated in its LayoutParams that it wants 3873 * to be the same size as the parent, the parent should ask the child to 3874 * layout given an exact size. 3875 * 3876 * @param spec The requirements for this view 3877 * @param padding The padding of this view for the current dimension and 3878 * margins, if applicable 3879 * @param childDimension How big the child wants to be in the current 3880 * dimension 3881 * @return a MeasureSpec integer for the child 3882 */ 3883 public static int getChildMeasureSpec(int spec, int padding, int childDimension) { 3884 int specMode = MeasureSpec.getMode(spec); 3885 int specSize = MeasureSpec.getSize(spec); 3886 3887 int size = Math.max(0, specSize - padding); 3888 3889 int resultSize = 0; 3890 int resultMode = 0; 3891 3892 switch (specMode) { 3893 // Parent has imposed an exact size on us 3894 case MeasureSpec.EXACTLY: 3895 if (childDimension >= 0) { 3896 resultSize = childDimension; 3897 resultMode = MeasureSpec.EXACTLY; 3898 } else if (childDimension == LayoutParams.MATCH_PARENT) { 3899 // Child wants to be our size. So be it. 3900 resultSize = size; 3901 resultMode = MeasureSpec.EXACTLY; 3902 } else if (childDimension == LayoutParams.WRAP_CONTENT) { 3903 // Child wants to determine its own size. It can't be 3904 // bigger than us. 3905 resultSize = size; 3906 resultMode = MeasureSpec.AT_MOST; 3907 } 3908 break; 3909 3910 // Parent has imposed a maximum size on us 3911 case MeasureSpec.AT_MOST: 3912 if (childDimension >= 0) { 3913 // Child wants a specific size... so be it 3914 resultSize = childDimension; 3915 resultMode = MeasureSpec.EXACTLY; 3916 } else if (childDimension == LayoutParams.MATCH_PARENT) { 3917 // Child wants to be our size, but our size is not fixed. 3918 // Constrain child to not be bigger than us. 3919 resultSize = size; 3920 resultMode = MeasureSpec.AT_MOST; 3921 } else if (childDimension == LayoutParams.WRAP_CONTENT) { 3922 // Child wants to determine its own size. It can't be 3923 // bigger than us. 3924 resultSize = size; 3925 resultMode = MeasureSpec.AT_MOST; 3926 } 3927 break; 3928 3929 // Parent asked to see how big we want to be 3930 case MeasureSpec.UNSPECIFIED: 3931 if (childDimension >= 0) { 3932 // Child wants a specific size... let him have it 3933 resultSize = childDimension; 3934 resultMode = MeasureSpec.EXACTLY; 3935 } else if (childDimension == LayoutParams.MATCH_PARENT) { 3936 // Child wants to be our size... find out how big it should 3937 // be 3938 resultSize = 0; 3939 resultMode = MeasureSpec.UNSPECIFIED; 3940 } else if (childDimension == LayoutParams.WRAP_CONTENT) { 3941 // Child wants to determine its own size.... find out how 3942 // big it should be 3943 resultSize = 0; 3944 resultMode = MeasureSpec.UNSPECIFIED; 3945 } 3946 break; 3947 } 3948 return MeasureSpec.makeMeasureSpec(resultSize, resultMode); 3949 } 3950 3951 3952 /** 3953 * Removes any pending animations for views that have been removed. Call 3954 * this if you don't want animations for exiting views to stack up. 3955 */ 3956 public void clearDisappearingChildren() { 3957 if (mDisappearingChildren != null) { 3958 mDisappearingChildren.clear(); 3959 } 3960 } 3961 3962 /** 3963 * Add a view which is removed from mChildren but still needs animation 3964 * 3965 * @param v View to add 3966 */ 3967 private void addDisappearingView(View v) { 3968 ArrayList<View> disappearingChildren = mDisappearingChildren; 3969 3970 if (disappearingChildren == null) { 3971 disappearingChildren = mDisappearingChildren = new ArrayList<View>(); 3972 } 3973 3974 disappearingChildren.add(v); 3975 } 3976 3977 /** 3978 * Cleanup a view when its animation is done. This may mean removing it from 3979 * the list of disappearing views. 3980 * 3981 * @param view The view whose animation has finished 3982 * @param animation The animation, cannot be null 3983 */ 3984 private void finishAnimatingView(final View view, Animation animation) { 3985 final ArrayList<View> disappearingChildren = mDisappearingChildren; 3986 if (disappearingChildren != null) { 3987 if (disappearingChildren.contains(view)) { 3988 disappearingChildren.remove(view); 3989 3990 if (view.mAttachInfo != null) { 3991 view.dispatchDetachedFromWindow(); 3992 } 3993 3994 view.clearAnimation(); 3995 mGroupFlags |= FLAG_INVALIDATE_REQUIRED; 3996 } 3997 } 3998 3999 if (animation != null && !animation.getFillAfter()) { 4000 view.clearAnimation(); 4001 } 4002 4003 if ((view.mPrivateFlags & ANIMATION_STARTED) == ANIMATION_STARTED) { 4004 view.onAnimationEnd(); 4005 // Should be performed by onAnimationEnd() but this avoid an infinite loop, 4006 // so we'd rather be safe than sorry 4007 view.mPrivateFlags &= ~ANIMATION_STARTED; 4008 // Draw one more frame after the animation is done 4009 mGroupFlags |= FLAG_INVALIDATE_REQUIRED; 4010 } 4011 } 4012 4013 /** 4014 * This method tells the ViewGroup that the given View object, which should have this 4015 * ViewGroup as its parent, 4016 * should be kept around (re-displayed when the ViewGroup draws its children) even if it 4017 * is removed from its parent. This allows animations, such as those used by 4018 * {@link android.app.Fragment} and {@link android.animation.LayoutTransition} to animate 4019 * the removal of views. A call to this method should always be accompanied by a later call 4020 * to {@link #endViewTransition(View)}, such as after an animation on the View has finished, 4021 * so that the View finally gets removed. 4022 * 4023 * @param view The View object to be kept visible even if it gets removed from its parent. 4024 */ 4025 public void startViewTransition(View view) { 4026 if (view.mParent == this) { 4027 if (mTransitioningViews == null) { 4028 mTransitioningViews = new ArrayList<View>(); 4029 } 4030 mTransitioningViews.add(view); 4031 } 4032 } 4033 4034 /** 4035 * This method should always be called following an earlier call to 4036 * {@link #startViewTransition(View)}. The given View is finally removed from its parent 4037 * and will no longer be displayed. Note that this method does not perform the functionality 4038 * of removing a view from its parent; it just discontinues the display of a View that 4039 * has previously been removed. 4040 * 4041 * @return view The View object that has been removed but is being kept around in the visible 4042 * hierarchy by an earlier call to {@link #startViewTransition(View)}. 4043 */ 4044 public void endViewTransition(View view) { 4045 if (mTransitioningViews != null) { 4046 mTransitioningViews.remove(view); 4047 final ArrayList<View> disappearingChildren = mDisappearingChildren; 4048 if (disappearingChildren != null && disappearingChildren.contains(view)) { 4049 disappearingChildren.remove(view); 4050 if (mVisibilityChangingChildren != null && 4051 mVisibilityChangingChildren.contains(view)) { 4052 mVisibilityChangingChildren.remove(view); 4053 } else { 4054 if (view.mAttachInfo != null) { 4055 view.dispatchDetachedFromWindow(); 4056 } 4057 if (view.mParent != null) { 4058 view.mParent = null; 4059 } 4060 } 4061 mGroupFlags |= FLAG_INVALIDATE_REQUIRED; 4062 } 4063 } 4064 } 4065 4066 private LayoutTransition.TransitionListener mLayoutTransitionListener = 4067 new LayoutTransition.TransitionListener() { 4068 @Override 4069 public void startTransition(LayoutTransition transition, ViewGroup container, 4070 View view, int transitionType) { 4071 // We only care about disappearing items, since we need special logic to keep 4072 // those items visible after they've been 'removed' 4073 if (transitionType == LayoutTransition.DISAPPEARING) { 4074 startViewTransition(view); 4075 } 4076 } 4077 4078 @Override 4079 public void endTransition(LayoutTransition transition, ViewGroup container, 4080 View view, int transitionType) { 4081 if (transitionType == LayoutTransition.DISAPPEARING && mTransitioningViews != null) { 4082 endViewTransition(view); 4083 } 4084 } 4085 }; 4086 4087 /** 4088 * {@inheritDoc} 4089 */ 4090 @Override 4091 public boolean gatherTransparentRegion(Region region) { 4092 // If no transparent regions requested, we are always opaque. 4093 final boolean meOpaque = (mPrivateFlags & View.REQUEST_TRANSPARENT_REGIONS) == 0; 4094 if (meOpaque && region == null) { 4095 // The caller doesn't care about the region, so stop now. 4096 return true; 4097 } 4098 super.gatherTransparentRegion(region); 4099 final View[] children = mChildren; 4100 final int count = mChildrenCount; 4101 boolean noneOfTheChildrenAreTransparent = true; 4102 for (int i = 0; i < count; i++) { 4103 final View child = children[i]; 4104 if ((child.mViewFlags & VISIBILITY_MASK) != GONE || child.getAnimation() != null) { 4105 if (!child.gatherTransparentRegion(region)) { 4106 noneOfTheChildrenAreTransparent = false; 4107 } 4108 } 4109 } 4110 return meOpaque || noneOfTheChildrenAreTransparent; 4111 } 4112 4113 /** 4114 * {@inheritDoc} 4115 */ 4116 public void requestTransparentRegion(View child) { 4117 if (child != null) { 4118 child.mPrivateFlags |= View.REQUEST_TRANSPARENT_REGIONS; 4119 if (mParent != null) { 4120 mParent.requestTransparentRegion(this); 4121 } 4122 } 4123 } 4124 4125 4126 @Override 4127 protected boolean fitSystemWindows(Rect insets) { 4128 boolean done = super.fitSystemWindows(insets); 4129 if (!done) { 4130 final int count = mChildrenCount; 4131 final View[] children = mChildren; 4132 for (int i = 0; i < count; i++) { 4133 done = children[i].fitSystemWindows(insets); 4134 if (done) { 4135 break; 4136 } 4137 } 4138 } 4139 return done; 4140 } 4141 4142 /** 4143 * Returns the animation listener to which layout animation events are 4144 * sent. 4145 * 4146 * @return an {@link android.view.animation.Animation.AnimationListener} 4147 */ 4148 public Animation.AnimationListener getLayoutAnimationListener() { 4149 return mAnimationListener; 4150 } 4151 4152 @Override 4153 protected void drawableStateChanged() { 4154 super.drawableStateChanged(); 4155 4156 if ((mGroupFlags & FLAG_NOTIFY_CHILDREN_ON_DRAWABLE_STATE_CHANGE) != 0) { 4157 if ((mGroupFlags & FLAG_ADD_STATES_FROM_CHILDREN) != 0) { 4158 throw new IllegalStateException("addStateFromChildren cannot be enabled if a" 4159 + " child has duplicateParentState set to true"); 4160 } 4161 4162 final View[] children = mChildren; 4163 final int count = mChildrenCount; 4164 4165 for (int i = 0; i < count; i++) { 4166 final View child = children[i]; 4167 if ((child.mViewFlags & DUPLICATE_PARENT_STATE) != 0) { 4168 child.refreshDrawableState(); 4169 } 4170 } 4171 } 4172 } 4173 4174 @Override 4175 protected int[] onCreateDrawableState(int extraSpace) { 4176 if ((mGroupFlags & FLAG_ADD_STATES_FROM_CHILDREN) == 0) { 4177 return super.onCreateDrawableState(extraSpace); 4178 } 4179 4180 int need = 0; 4181 int n = getChildCount(); 4182 for (int i = 0; i < n; i++) { 4183 int[] childState = getChildAt(i).getDrawableState(); 4184 4185 if (childState != null) { 4186 need += childState.length; 4187 } 4188 } 4189 4190 int[] state = super.onCreateDrawableState(extraSpace + need); 4191 4192 for (int i = 0; i < n; i++) { 4193 int[] childState = getChildAt(i).getDrawableState(); 4194 4195 if (childState != null) { 4196 state = mergeDrawableStates(state, childState); 4197 } 4198 } 4199 4200 return state; 4201 } 4202 4203 /** 4204 * Sets whether this ViewGroup's drawable states also include 4205 * its children's drawable states. This is used, for example, to 4206 * make a group appear to be focused when its child EditText or button 4207 * is focused. 4208 */ 4209 public void setAddStatesFromChildren(boolean addsStates) { 4210 if (addsStates) { 4211 mGroupFlags |= FLAG_ADD_STATES_FROM_CHILDREN; 4212 } else { 4213 mGroupFlags &= ~FLAG_ADD_STATES_FROM_CHILDREN; 4214 } 4215 4216 refreshDrawableState(); 4217 } 4218 4219 /** 4220 * Returns whether this ViewGroup's drawable states also include 4221 * its children's drawable states. This is used, for example, to 4222 * make a group appear to be focused when its child EditText or button 4223 * is focused. 4224 */ 4225 public boolean addStatesFromChildren() { 4226 return (mGroupFlags & FLAG_ADD_STATES_FROM_CHILDREN) != 0; 4227 } 4228 4229 /** 4230 * If {link #addStatesFromChildren} is true, refreshes this group's 4231 * drawable state (to include the states from its children). 4232 */ 4233 public void childDrawableStateChanged(View child) { 4234 if ((mGroupFlags & FLAG_ADD_STATES_FROM_CHILDREN) != 0) { 4235 refreshDrawableState(); 4236 } 4237 } 4238 4239 /** 4240 * Specifies the animation listener to which layout animation events must 4241 * be sent. Only 4242 * {@link android.view.animation.Animation.AnimationListener#onAnimationStart(Animation)} 4243 * and 4244 * {@link android.view.animation.Animation.AnimationListener#onAnimationEnd(Animation)} 4245 * are invoked. 4246 * 4247 * @param animationListener the layout animation listener 4248 */ 4249 public void setLayoutAnimationListener(Animation.AnimationListener animationListener) { 4250 mAnimationListener = animationListener; 4251 } 4252 4253 /** 4254 * LayoutParams are used by views to tell their parents how they want to be 4255 * laid out. See 4256 * {@link android.R.styleable#ViewGroup_Layout ViewGroup Layout Attributes} 4257 * for a list of all child view attributes that this class supports. 4258 * 4259 * <p> 4260 * The base LayoutParams class just describes how big the view wants to be 4261 * for both width and height. For each dimension, it can specify one of: 4262 * <ul> 4263 * <li>FILL_PARENT (renamed MATCH_PARENT in API Level 8 and higher), which 4264 * means that the view wants to be as big as its parent (minus padding) 4265 * <li> WRAP_CONTENT, which means that the view wants to be just big enough 4266 * to enclose its content (plus padding) 4267 * <li> an exact number 4268 * </ul> 4269 * There are subclasses of LayoutParams for different subclasses of 4270 * ViewGroup. For example, AbsoluteLayout has its own subclass of 4271 * LayoutParams which adds an X and Y value. 4272 * 4273 * @attr ref android.R.styleable#ViewGroup_Layout_layout_height 4274 * @attr ref android.R.styleable#ViewGroup_Layout_layout_width 4275 */ 4276 public static class LayoutParams { 4277 /** 4278 * Special value for the height or width requested by a View. 4279 * FILL_PARENT means that the view wants to be as big as its parent, 4280 * minus the parent's padding, if any. This value is deprecated 4281 * starting in API Level 8 and replaced by {@link #MATCH_PARENT}. 4282 */ 4283 @SuppressWarnings({"UnusedDeclaration"}) 4284 @Deprecated 4285 public static final int FILL_PARENT = -1; 4286 4287 /** 4288 * Special value for the height or width requested by a View. 4289 * MATCH_PARENT means that the view wants to be as big as its parent, 4290 * minus the parent's padding, if any. Introduced in API Level 8. 4291 */ 4292 public static final int MATCH_PARENT = -1; 4293 4294 /** 4295 * Special value for the height or width requested by a View. 4296 * WRAP_CONTENT means that the view wants to be just large enough to fit 4297 * its own internal content, taking its own padding into account. 4298 */ 4299 public static final int WRAP_CONTENT = -2; 4300 4301 /** 4302 * Information about how wide the view wants to be. Can be one of the 4303 * constants FILL_PARENT (replaced by MATCH_PARENT , 4304 * in API Level 8) or WRAP_CONTENT. or an exact size. 4305 */ 4306 @ViewDebug.ExportedProperty(category = "layout", mapping = { 4307 @ViewDebug.IntToString(from = MATCH_PARENT, to = "MATCH_PARENT"), 4308 @ViewDebug.IntToString(from = WRAP_CONTENT, to = "WRAP_CONTENT") 4309 }) 4310 public int width; 4311 4312 /** 4313 * Information about how tall the view wants to be. Can be one of the 4314 * constants FILL_PARENT (replaced by MATCH_PARENT , 4315 * in API Level 8) or WRAP_CONTENT. or an exact size. 4316 */ 4317 @ViewDebug.ExportedProperty(category = "layout", mapping = { 4318 @ViewDebug.IntToString(from = MATCH_PARENT, to = "MATCH_PARENT"), 4319 @ViewDebug.IntToString(from = WRAP_CONTENT, to = "WRAP_CONTENT") 4320 }) 4321 public int height; 4322 4323 /** 4324 * Used to animate layouts. 4325 */ 4326 public LayoutAnimationController.AnimationParameters layoutAnimationParameters; 4327 4328 /** 4329 * Creates a new set of layout parameters. The values are extracted from 4330 * the supplied attributes set and context. The XML attributes mapped 4331 * to this set of layout parameters are: 4332 * 4333 * <ul> 4334 * <li><code>layout_width</code>: the width, either an exact value, 4335 * {@link #WRAP_CONTENT}, or {@link #FILL_PARENT} (replaced by 4336 * {@link #MATCH_PARENT} in API Level 8)</li> 4337 * <li><code>layout_height</code>: the height, either an exact value, 4338 * {@link #WRAP_CONTENT}, or {@link #FILL_PARENT} (replaced by 4339 * {@link #MATCH_PARENT} in API Level 8)</li> 4340 * </ul> 4341 * 4342 * @param c the application environment 4343 * @param attrs the set of attributes from which to extract the layout 4344 * parameters' values 4345 */ 4346 public LayoutParams(Context c, AttributeSet attrs) { 4347 TypedArray a = c.obtainStyledAttributes(attrs, R.styleable.ViewGroup_Layout); 4348 setBaseAttributes(a, 4349 R.styleable.ViewGroup_Layout_layout_width, 4350 R.styleable.ViewGroup_Layout_layout_height); 4351 a.recycle(); 4352 } 4353 4354 /** 4355 * Creates a new set of layout parameters with the specified width 4356 * and height. 4357 * 4358 * @param width the width, either {@link #WRAP_CONTENT}, 4359 * {@link #FILL_PARENT} (replaced by {@link #MATCH_PARENT} in 4360 * API Level 8), or a fixed size in pixels 4361 * @param height the height, either {@link #WRAP_CONTENT}, 4362 * {@link #FILL_PARENT} (replaced by {@link #MATCH_PARENT} in 4363 * API Level 8), or a fixed size in pixels 4364 */ 4365 public LayoutParams(int width, int height) { 4366 this.width = width; 4367 this.height = height; 4368 } 4369 4370 /** 4371 * Copy constructor. Clones the width and height values of the source. 4372 * 4373 * @param source The layout params to copy from. 4374 */ 4375 public LayoutParams(LayoutParams source) { 4376 this.width = source.width; 4377 this.height = source.height; 4378 } 4379 4380 /** 4381 * Used internally by MarginLayoutParams. 4382 * @hide 4383 */ 4384 LayoutParams() { 4385 } 4386 4387 /** 4388 * Extracts the layout parameters from the supplied attributes. 4389 * 4390 * @param a the style attributes to extract the parameters from 4391 * @param widthAttr the identifier of the width attribute 4392 * @param heightAttr the identifier of the height attribute 4393 */ 4394 protected void setBaseAttributes(TypedArray a, int widthAttr, int heightAttr) { 4395 width = a.getLayoutDimension(widthAttr, "layout_width"); 4396 height = a.getLayoutDimension(heightAttr, "layout_height"); 4397 } 4398 4399 /** 4400 * Returns a String representation of this set of layout parameters. 4401 * 4402 * @param output the String to prepend to the internal representation 4403 * @return a String with the following format: output + 4404 * "ViewGroup.LayoutParams={ width=WIDTH, height=HEIGHT }" 4405 * 4406 * @hide 4407 */ 4408 public String debug(String output) { 4409 return output + "ViewGroup.LayoutParams={ width=" 4410 + sizeToString(width) + ", height=" + sizeToString(height) + " }"; 4411 } 4412 4413 /** 4414 * Converts the specified size to a readable String. 4415 * 4416 * @param size the size to convert 4417 * @return a String instance representing the supplied size 4418 * 4419 * @hide 4420 */ 4421 protected static String sizeToString(int size) { 4422 if (size == WRAP_CONTENT) { 4423 return "wrap-content"; 4424 } 4425 if (size == MATCH_PARENT) { 4426 return "match-parent"; 4427 } 4428 return String.valueOf(size); 4429 } 4430 } 4431 4432 /** 4433 * Per-child layout information for layouts that support margins. 4434 * See 4435 * {@link android.R.styleable#ViewGroup_MarginLayout ViewGroup Margin Layout Attributes} 4436 * for a list of all child view attributes that this class supports. 4437 */ 4438 public static class MarginLayoutParams extends ViewGroup.LayoutParams { 4439 /** 4440 * The left margin in pixels of the child. 4441 */ 4442 @ViewDebug.ExportedProperty(category = "layout") 4443 public int leftMargin; 4444 4445 /** 4446 * The top margin in pixels of the child. 4447 */ 4448 @ViewDebug.ExportedProperty(category = "layout") 4449 public int topMargin; 4450 4451 /** 4452 * The right margin in pixels of the child. 4453 */ 4454 @ViewDebug.ExportedProperty(category = "layout") 4455 public int rightMargin; 4456 4457 /** 4458 * The bottom margin in pixels of the child. 4459 */ 4460 @ViewDebug.ExportedProperty(category = "layout") 4461 public int bottomMargin; 4462 4463 /** 4464 * Creates a new set of layout parameters. The values are extracted from 4465 * the supplied attributes set and context. 4466 * 4467 * @param c the application environment 4468 * @param attrs the set of attributes from which to extract the layout 4469 * parameters' values 4470 */ 4471 public MarginLayoutParams(Context c, AttributeSet attrs) { 4472 super(); 4473 4474 TypedArray a = c.obtainStyledAttributes(attrs, R.styleable.ViewGroup_MarginLayout); 4475 setBaseAttributes(a, 4476 R.styleable.ViewGroup_MarginLayout_layout_width, 4477 R.styleable.ViewGroup_MarginLayout_layout_height); 4478 4479 int margin = a.getDimensionPixelSize( 4480 com.android.internal.R.styleable.ViewGroup_MarginLayout_layout_margin, -1); 4481 if (margin >= 0) { 4482 leftMargin = margin; 4483 topMargin = margin; 4484 rightMargin= margin; 4485 bottomMargin = margin; 4486 } else { 4487 leftMargin = a.getDimensionPixelSize( 4488 R.styleable.ViewGroup_MarginLayout_layout_marginLeft, 0); 4489 topMargin = a.getDimensionPixelSize( 4490 R.styleable.ViewGroup_MarginLayout_layout_marginTop, 0); 4491 rightMargin = a.getDimensionPixelSize( 4492 R.styleable.ViewGroup_MarginLayout_layout_marginRight, 0); 4493 bottomMargin = a.getDimensionPixelSize( 4494 R.styleable.ViewGroup_MarginLayout_layout_marginBottom, 0); 4495 } 4496 4497 a.recycle(); 4498 } 4499 4500 /** 4501 * {@inheritDoc} 4502 */ 4503 public MarginLayoutParams(int width, int height) { 4504 super(width, height); 4505 } 4506 4507 /** 4508 * Copy constructor. Clones the width, height and margin values of the source. 4509 * 4510 * @param source The layout params to copy from. 4511 */ 4512 public MarginLayoutParams(MarginLayoutParams source) { 4513 this.width = source.width; 4514 this.height = source.height; 4515 4516 this.leftMargin = source.leftMargin; 4517 this.topMargin = source.topMargin; 4518 this.rightMargin = source.rightMargin; 4519 this.bottomMargin = source.bottomMargin; 4520 } 4521 4522 /** 4523 * {@inheritDoc} 4524 */ 4525 public MarginLayoutParams(LayoutParams source) { 4526 super(source); 4527 } 4528 4529 /** 4530 * Sets the margins, in pixels. 4531 * 4532 * @param left the left margin size 4533 * @param top the top margin size 4534 * @param right the right margin size 4535 * @param bottom the bottom margin size 4536 * 4537 * @attr ref android.R.styleable#ViewGroup_MarginLayout_layout_marginLeft 4538 * @attr ref android.R.styleable#ViewGroup_MarginLayout_layout_marginTop 4539 * @attr ref android.R.styleable#ViewGroup_MarginLayout_layout_marginRight 4540 * @attr ref android.R.styleable#ViewGroup_MarginLayout_layout_marginBottom 4541 */ 4542 public void setMargins(int left, int top, int right, int bottom) { 4543 leftMargin = left; 4544 topMargin = top; 4545 rightMargin = right; 4546 bottomMargin = bottom; 4547 } 4548 } 4549 4550 /* Describes a touched view and the ids of the pointers that it has captured. 4551 * 4552 * This code assumes that pointer ids are always in the range 0..31 such that 4553 * it can use a bitfield to track which pointer ids are present. 4554 * As it happens, the lower layers of the input dispatch pipeline also use the 4555 * same trick so the assumption should be safe here... 4556 */ 4557 private static final class TouchTarget { 4558 private static final int MAX_RECYCLED = 32; 4559 private static final Object sRecycleLock = new Object(); 4560 private static TouchTarget sRecycleBin; 4561 private static int sRecycledCount; 4562 4563 public static final int ALL_POINTER_IDS = -1; // all ones 4564 4565 // The touched child view. 4566 public View child; 4567 4568 // The combined bit mask of pointer ids for all pointers captured by the target. 4569 public int pointerIdBits; 4570 4571 // The next target in the target list. 4572 public TouchTarget next; 4573 4574 private TouchTarget() { 4575 } 4576 4577 public static TouchTarget obtain(View child, int pointerIdBits) { 4578 final TouchTarget target; 4579 synchronized (sRecycleLock) { 4580 if (sRecycleBin == null) { 4581 target = new TouchTarget(); 4582 } else { 4583 target = sRecycleBin; 4584 sRecycleBin = target.next; 4585 sRecycledCount--; 4586 target.next = null; 4587 } 4588 } 4589 target.child = child; 4590 target.pointerIdBits = pointerIdBits; 4591 return target; 4592 } 4593 4594 public void recycle() { 4595 synchronized (sRecycleLock) { 4596 if (sRecycledCount < MAX_RECYCLED) { 4597 next = sRecycleBin; 4598 sRecycleBin = this; 4599 sRecycledCount += 1; 4600 } 4601 } 4602 } 4603 } 4604} 4605