ViewGroup.java revision 32affef4f86961c57d9ba14572ec65dc2a5451de
1/* 2 * Copyright (C) 2006 The Android Open Source Project 3 * 4 * Licensed under the Apache License, Version 2.0 (the "License"); 5 * you may not use this file except in compliance with the License. 6 * You may obtain a copy of the License at 7 * 8 * http://www.apache.org/licenses/LICENSE-2.0 9 * 10 * Unless required by applicable law or agreed to in writing, software 11 * distributed under the License is distributed on an "AS IS" BASIS, 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 13 * See the License for the specific language governing permissions and 14 * limitations under the License. 15 */ 16 17package android.view; 18 19import android.animation.LayoutTransition; 20import com.android.internal.R; 21 22import android.content.Context; 23import android.content.res.Configuration; 24import android.content.res.TypedArray; 25import android.graphics.Bitmap; 26import android.graphics.Canvas; 27import android.graphics.Matrix; 28import android.graphics.Paint; 29import android.graphics.PointF; 30import android.graphics.Rect; 31import android.graphics.RectF; 32import android.graphics.Region; 33import android.os.Parcelable; 34import android.os.SystemClock; 35import android.util.AttributeSet; 36import android.util.Log; 37import android.util.SparseArray; 38import android.view.accessibility.AccessibilityEvent; 39import android.view.animation.Animation; 40import android.view.animation.AnimationUtils; 41import android.view.animation.LayoutAnimationController; 42import android.view.animation.Transformation; 43 44import java.util.ArrayList; 45 46/** 47 * <p> 48 * A <code>ViewGroup</code> is a special view that can contain other views 49 * (called children.) The view group is the base class for layouts and views 50 * containers. This class also defines the 51 * {@link android.view.ViewGroup.LayoutParams} class which serves as the base 52 * class for layouts parameters. 53 * </p> 54 * 55 * <p> 56 * Also see {@link LayoutParams} for layout attributes. 57 * </p> 58 * 59 * @attr ref android.R.styleable#ViewGroup_clipChildren 60 * @attr ref android.R.styleable#ViewGroup_clipToPadding 61 * @attr ref android.R.styleable#ViewGroup_layoutAnimation 62 * @attr ref android.R.styleable#ViewGroup_animationCache 63 * @attr ref android.R.styleable#ViewGroup_persistentDrawingCache 64 * @attr ref android.R.styleable#ViewGroup_alwaysDrawnWithCache 65 * @attr ref android.R.styleable#ViewGroup_addStatesFromChildren 66 * @attr ref android.R.styleable#ViewGroup_descendantFocusability 67 * @attr ref android.R.styleable#ViewGroup_animateLayoutChanges 68 */ 69public abstract class ViewGroup extends View implements ViewParent, ViewManager { 70 71 private static final boolean DBG = false; 72 73 /** 74 * Views which have been hidden or removed which need to be animated on 75 * their way out. 76 * This field should be made private, so it is hidden from the SDK. 77 * {@hide} 78 */ 79 protected ArrayList<View> mDisappearingChildren; 80 81 /** 82 * Listener used to propagate events indicating when children are added 83 * and/or removed from a view group. 84 * This field should be made private, so it is hidden from the SDK. 85 * {@hide} 86 */ 87 protected OnHierarchyChangeListener mOnHierarchyChangeListener; 88 89 // The view contained within this ViewGroup that has or contains focus. 90 private View mFocused; 91 92 /** 93 * A Transformation used when drawing children, to 94 * apply on the child being drawn. 95 */ 96 private final Transformation mChildTransformation = new Transformation(); 97 98 /** 99 * Used to track the current invalidation region. 100 */ 101 private RectF mInvalidateRegion; 102 103 /** 104 * A Transformation used to calculate a correct 105 * invalidation area when the application is autoscaled. 106 */ 107 private Transformation mInvalidationTransformation; 108 109 // View currently under an ongoing drag 110 private View mCurrentDragView; 111 112 // Does this group have a child that can accept the current drag payload? 113 private boolean mChildAcceptsDrag; 114 115 // Used during drag dispatch 116 private final PointF mLocalPoint = new PointF(); 117 118 // Layout animation 119 private LayoutAnimationController mLayoutAnimationController; 120 private Animation.AnimationListener mAnimationListener; 121 122 // First touch target in the linked list of touch targets. 123 private TouchTarget mFirstTouchTarget; 124 125 // Temporary arrays for splitting pointers. 126 private int[] mTmpPointerIndexMap; 127 private int[] mTmpPointerIds; 128 private MotionEvent.PointerCoords[] mTmpPointerCoords; 129 130 /** 131 * Internal flags. 132 * 133 * This field should be made private, so it is hidden from the SDK. 134 * {@hide} 135 */ 136 protected int mGroupFlags; 137 138 // When set, ViewGroup invalidates only the child's rectangle 139 // Set by default 140 private static final int FLAG_CLIP_CHILDREN = 0x1; 141 142 // When set, ViewGroup excludes the padding area from the invalidate rectangle 143 // Set by default 144 private static final int FLAG_CLIP_TO_PADDING = 0x2; 145 146 // When set, dispatchDraw() will invoke invalidate(); this is set by drawChild() when 147 // a child needs to be invalidated and FLAG_OPTIMIZE_INVALIDATE is set 148 private static final int FLAG_INVALIDATE_REQUIRED = 0x4; 149 150 // When set, dispatchDraw() will run the layout animation and unset the flag 151 private static final int FLAG_RUN_ANIMATION = 0x8; 152 153 // When set, there is either no layout animation on the ViewGroup or the layout 154 // animation is over 155 // Set by default 156 private static final int FLAG_ANIMATION_DONE = 0x10; 157 158 // If set, this ViewGroup has padding; if unset there is no padding and we don't need 159 // to clip it, even if FLAG_CLIP_TO_PADDING is set 160 private static final int FLAG_PADDING_NOT_NULL = 0x20; 161 162 // When set, this ViewGroup caches its children in a Bitmap before starting a layout animation 163 // Set by default 164 private static final int FLAG_ANIMATION_CACHE = 0x40; 165 166 // When set, this ViewGroup converts calls to invalidate(Rect) to invalidate() during a 167 // layout animation; this avoid clobbering the hierarchy 168 // Automatically set when the layout animation starts, depending on the animation's 169 // characteristics 170 private static final int FLAG_OPTIMIZE_INVALIDATE = 0x80; 171 172 // When set, the next call to drawChild() will clear mChildTransformation's matrix 173 private static final int FLAG_CLEAR_TRANSFORMATION = 0x100; 174 175 // When set, this ViewGroup invokes mAnimationListener.onAnimationEnd() and removes 176 // the children's Bitmap caches if necessary 177 // This flag is set when the layout animation is over (after FLAG_ANIMATION_DONE is set) 178 private static final int FLAG_NOTIFY_ANIMATION_LISTENER = 0x200; 179 180 /** 181 * When set, the drawing method will call {@link #getChildDrawingOrder(int, int)} 182 * to get the index of the child to draw for that iteration. 183 * 184 * @hide 185 */ 186 protected static final int FLAG_USE_CHILD_DRAWING_ORDER = 0x400; 187 188 /** 189 * When set, this ViewGroup supports static transformations on children; this causes 190 * {@link #getChildStaticTransformation(View, android.view.animation.Transformation)} to be 191 * invoked when a child is drawn. 192 * 193 * Any subclass overriding 194 * {@link #getChildStaticTransformation(View, android.view.animation.Transformation)} should 195 * set this flags in {@link #mGroupFlags}. 196 * 197 * {@hide} 198 */ 199 protected static final int FLAG_SUPPORT_STATIC_TRANSFORMATIONS = 0x800; 200 201 // When the previous drawChild() invocation used an alpha value that was lower than 202 // 1.0 and set it in mCachePaint 203 private static final int FLAG_ALPHA_LOWER_THAN_ONE = 0x1000; 204 205 /** 206 * When set, this ViewGroup's drawable states also include those 207 * of its children. 208 */ 209 private static final int FLAG_ADD_STATES_FROM_CHILDREN = 0x2000; 210 211 /** 212 * When set, this ViewGroup tries to always draw its children using their drawing cache. 213 */ 214 private static final int FLAG_ALWAYS_DRAWN_WITH_CACHE = 0x4000; 215 216 /** 217 * When set, and if FLAG_ALWAYS_DRAWN_WITH_CACHE is not set, this ViewGroup will try to 218 * draw its children with their drawing cache. 219 */ 220 private static final int FLAG_CHILDREN_DRAWN_WITH_CACHE = 0x8000; 221 222 /** 223 * When set, this group will go through its list of children to notify them of 224 * any drawable state change. 225 */ 226 private static final int FLAG_NOTIFY_CHILDREN_ON_DRAWABLE_STATE_CHANGE = 0x10000; 227 228 private static final int FLAG_MASK_FOCUSABILITY = 0x60000; 229 230 /** 231 * This view will get focus before any of its descendants. 232 */ 233 public static final int FOCUS_BEFORE_DESCENDANTS = 0x20000; 234 235 /** 236 * This view will get focus only if none of its descendants want it. 237 */ 238 public static final int FOCUS_AFTER_DESCENDANTS = 0x40000; 239 240 /** 241 * This view will block any of its descendants from getting focus, even 242 * if they are focusable. 243 */ 244 public static final int FOCUS_BLOCK_DESCENDANTS = 0x60000; 245 246 /** 247 * Used to map between enum in attrubutes and flag values. 248 */ 249 private static final int[] DESCENDANT_FOCUSABILITY_FLAGS = 250 {FOCUS_BEFORE_DESCENDANTS, FOCUS_AFTER_DESCENDANTS, 251 FOCUS_BLOCK_DESCENDANTS}; 252 253 /** 254 * When set, this ViewGroup should not intercept touch events. 255 * {@hide} 256 */ 257 protected static final int FLAG_DISALLOW_INTERCEPT = 0x80000; 258 259 /** 260 * When set, this ViewGroup will split MotionEvents to multiple child Views when appropriate. 261 */ 262 private static final int FLAG_SPLIT_MOTION_EVENTS = 0x200000; 263 264 /** 265 * Indicates which types of drawing caches are to be kept in memory. 266 * This field should be made private, so it is hidden from the SDK. 267 * {@hide} 268 */ 269 protected int mPersistentDrawingCache; 270 271 /** 272 * Used to indicate that no drawing cache should be kept in memory. 273 */ 274 public static final int PERSISTENT_NO_CACHE = 0x0; 275 276 /** 277 * Used to indicate that the animation drawing cache should be kept in memory. 278 */ 279 public static final int PERSISTENT_ANIMATION_CACHE = 0x1; 280 281 /** 282 * Used to indicate that the scrolling drawing cache should be kept in memory. 283 */ 284 public static final int PERSISTENT_SCROLLING_CACHE = 0x2; 285 286 /** 287 * Used to indicate that all drawing caches should be kept in memory. 288 */ 289 public static final int PERSISTENT_ALL_CACHES = 0x3; 290 291 /** 292 * We clip to padding when FLAG_CLIP_TO_PADDING and FLAG_PADDING_NOT_NULL 293 * are set at the same time. 294 */ 295 protected static final int CLIP_TO_PADDING_MASK = FLAG_CLIP_TO_PADDING | FLAG_PADDING_NOT_NULL; 296 297 // Index of the child's left position in the mLocation array 298 private static final int CHILD_LEFT_INDEX = 0; 299 // Index of the child's top position in the mLocation array 300 private static final int CHILD_TOP_INDEX = 1; 301 302 // Child views of this ViewGroup 303 private View[] mChildren; 304 // Number of valid children in the mChildren array, the rest should be null or not 305 // considered as children 306 private int mChildrenCount; 307 308 private static final int ARRAY_INITIAL_CAPACITY = 12; 309 private static final int ARRAY_CAPACITY_INCREMENT = 12; 310 311 // Used to draw cached views 312 private final Paint mCachePaint = new Paint(); 313 314 // Used to animate add/remove changes in layout 315 private LayoutTransition mTransition; 316 317 // The set of views that are currently being transitioned. This list is used to track views 318 // being removed that should not actually be removed from the parent yet because they are 319 // being animated. 320 private ArrayList<View> mTransitioningViews; 321 322 // List of children changing visibility. This is used to potentially keep rendering 323 // views during a transition when they otherwise would have become gone/invisible 324 private ArrayList<View> mVisibilityChangingChildren; 325 326 public ViewGroup(Context context) { 327 super(context); 328 initViewGroup(); 329 } 330 331 public ViewGroup(Context context, AttributeSet attrs) { 332 super(context, attrs); 333 initViewGroup(); 334 initFromAttributes(context, attrs); 335 } 336 337 public ViewGroup(Context context, AttributeSet attrs, int defStyle) { 338 super(context, attrs, defStyle); 339 initViewGroup(); 340 initFromAttributes(context, attrs); 341 } 342 343 private void initViewGroup() { 344 // ViewGroup doesn't draw by default 345 setFlags(WILL_NOT_DRAW, DRAW_MASK); 346 mGroupFlags |= FLAG_CLIP_CHILDREN; 347 mGroupFlags |= FLAG_CLIP_TO_PADDING; 348 mGroupFlags |= FLAG_ANIMATION_DONE; 349 mGroupFlags |= FLAG_ANIMATION_CACHE; 350 mGroupFlags |= FLAG_ALWAYS_DRAWN_WITH_CACHE; 351 352 setDescendantFocusability(FOCUS_BEFORE_DESCENDANTS); 353 354 mChildren = new View[ARRAY_INITIAL_CAPACITY]; 355 mChildrenCount = 0; 356 357 mCachePaint.setDither(false); 358 359 mPersistentDrawingCache = PERSISTENT_SCROLLING_CACHE; 360 } 361 362 private void initFromAttributes(Context context, AttributeSet attrs) { 363 TypedArray a = context.obtainStyledAttributes(attrs, 364 R.styleable.ViewGroup); 365 366 final int N = a.getIndexCount(); 367 for (int i = 0; i < N; i++) { 368 int attr = a.getIndex(i); 369 switch (attr) { 370 case R.styleable.ViewGroup_clipChildren: 371 setClipChildren(a.getBoolean(attr, true)); 372 break; 373 case R.styleable.ViewGroup_clipToPadding: 374 setClipToPadding(a.getBoolean(attr, true)); 375 break; 376 case R.styleable.ViewGroup_animationCache: 377 setAnimationCacheEnabled(a.getBoolean(attr, true)); 378 break; 379 case R.styleable.ViewGroup_persistentDrawingCache: 380 setPersistentDrawingCache(a.getInt(attr, PERSISTENT_SCROLLING_CACHE)); 381 break; 382 case R.styleable.ViewGroup_addStatesFromChildren: 383 setAddStatesFromChildren(a.getBoolean(attr, false)); 384 break; 385 case R.styleable.ViewGroup_alwaysDrawnWithCache: 386 setAlwaysDrawnWithCacheEnabled(a.getBoolean(attr, true)); 387 break; 388 case R.styleable.ViewGroup_layoutAnimation: 389 int id = a.getResourceId(attr, -1); 390 if (id > 0) { 391 setLayoutAnimation(AnimationUtils.loadLayoutAnimation(mContext, id)); 392 } 393 break; 394 case R.styleable.ViewGroup_descendantFocusability: 395 setDescendantFocusability(DESCENDANT_FOCUSABILITY_FLAGS[a.getInt(attr, 0)]); 396 break; 397 case R.styleable.ViewGroup_splitMotionEvents: 398 setMotionEventSplittingEnabled(a.getBoolean(attr, false)); 399 break; 400 case R.styleable.ViewGroup_animateLayoutChanges: 401 boolean animateLayoutChanges = a.getBoolean(attr, false); 402 if (animateLayoutChanges) { 403 setLayoutTransition(new LayoutTransition()); 404 } 405 break; 406 } 407 } 408 409 a.recycle(); 410 } 411 412 /** 413 * Gets the descendant focusability of this view group. The descendant 414 * focusability defines the relationship between this view group and its 415 * descendants when looking for a view to take focus in 416 * {@link #requestFocus(int, android.graphics.Rect)}. 417 * 418 * @return one of {@link #FOCUS_BEFORE_DESCENDANTS}, {@link #FOCUS_AFTER_DESCENDANTS}, 419 * {@link #FOCUS_BLOCK_DESCENDANTS}. 420 */ 421 @ViewDebug.ExportedProperty(category = "focus", mapping = { 422 @ViewDebug.IntToString(from = FOCUS_BEFORE_DESCENDANTS, to = "FOCUS_BEFORE_DESCENDANTS"), 423 @ViewDebug.IntToString(from = FOCUS_AFTER_DESCENDANTS, to = "FOCUS_AFTER_DESCENDANTS"), 424 @ViewDebug.IntToString(from = FOCUS_BLOCK_DESCENDANTS, to = "FOCUS_BLOCK_DESCENDANTS") 425 }) 426 public int getDescendantFocusability() { 427 return mGroupFlags & FLAG_MASK_FOCUSABILITY; 428 } 429 430 /** 431 * Set the descendant focusability of this view group. This defines the relationship 432 * between this view group and its descendants when looking for a view to 433 * take focus in {@link #requestFocus(int, android.graphics.Rect)}. 434 * 435 * @param focusability one of {@link #FOCUS_BEFORE_DESCENDANTS}, {@link #FOCUS_AFTER_DESCENDANTS}, 436 * {@link #FOCUS_BLOCK_DESCENDANTS}. 437 */ 438 public void setDescendantFocusability(int focusability) { 439 switch (focusability) { 440 case FOCUS_BEFORE_DESCENDANTS: 441 case FOCUS_AFTER_DESCENDANTS: 442 case FOCUS_BLOCK_DESCENDANTS: 443 break; 444 default: 445 throw new IllegalArgumentException("must be one of FOCUS_BEFORE_DESCENDANTS, " 446 + "FOCUS_AFTER_DESCENDANTS, FOCUS_BLOCK_DESCENDANTS"); 447 } 448 mGroupFlags &= ~FLAG_MASK_FOCUSABILITY; 449 mGroupFlags |= (focusability & FLAG_MASK_FOCUSABILITY); 450 } 451 452 /** 453 * {@inheritDoc} 454 */ 455 @Override 456 void handleFocusGainInternal(int direction, Rect previouslyFocusedRect) { 457 if (mFocused != null) { 458 mFocused.unFocus(); 459 mFocused = null; 460 } 461 super.handleFocusGainInternal(direction, previouslyFocusedRect); 462 } 463 464 /** 465 * {@inheritDoc} 466 */ 467 public void requestChildFocus(View child, View focused) { 468 if (DBG) { 469 System.out.println(this + " requestChildFocus()"); 470 } 471 if (getDescendantFocusability() == FOCUS_BLOCK_DESCENDANTS) { 472 return; 473 } 474 475 // Unfocus us, if necessary 476 super.unFocus(); 477 478 // We had a previous notion of who had focus. Clear it. 479 if (mFocused != child) { 480 if (mFocused != null) { 481 mFocused.unFocus(); 482 } 483 484 mFocused = child; 485 } 486 if (mParent != null) { 487 mParent.requestChildFocus(this, focused); 488 } 489 } 490 491 /** 492 * {@inheritDoc} 493 */ 494 public void focusableViewAvailable(View v) { 495 if (mParent != null 496 // shortcut: don't report a new focusable view if we block our descendants from 497 // getting focus 498 && (getDescendantFocusability() != FOCUS_BLOCK_DESCENDANTS) 499 // shortcut: don't report a new focusable view if we already are focused 500 // (and we don't prefer our descendants) 501 // 502 // note: knowing that mFocused is non-null is not a good enough reason 503 // to break the traversal since in that case we'd actually have to find 504 // the focused view and make sure it wasn't FOCUS_AFTER_DESCENDANTS and 505 // an ancestor of v; this will get checked for at ViewRoot 506 && !(isFocused() && getDescendantFocusability() != FOCUS_AFTER_DESCENDANTS)) { 507 mParent.focusableViewAvailable(v); 508 } 509 } 510 511 /** 512 * {@inheritDoc} 513 */ 514 public boolean showContextMenuForChild(View originalView) { 515 return mParent != null && mParent.showContextMenuForChild(originalView); 516 } 517 518 /** 519 * {@inheritDoc} 520 */ 521 public ActionMode startActionModeForChild(View originalView, ActionMode.Callback callback) { 522 return mParent != null ? mParent.startActionModeForChild(originalView, callback) : null; 523 } 524 525 /** 526 * Find the nearest view in the specified direction that wants to take 527 * focus. 528 * 529 * @param focused The view that currently has focus 530 * @param direction One of FOCUS_UP, FOCUS_DOWN, FOCUS_LEFT, and 531 * FOCUS_RIGHT, or 0 for not applicable. 532 */ 533 public View focusSearch(View focused, int direction) { 534 if (isRootNamespace()) { 535 // root namespace means we should consider ourselves the top of the 536 // tree for focus searching; otherwise we could be focus searching 537 // into other tabs. see LocalActivityManager and TabHost for more info 538 return FocusFinder.getInstance().findNextFocus(this, focused, direction); 539 } else if (mParent != null) { 540 return mParent.focusSearch(focused, direction); 541 } 542 return null; 543 } 544 545 /** 546 * {@inheritDoc} 547 */ 548 public boolean requestChildRectangleOnScreen(View child, Rect rectangle, boolean immediate) { 549 return false; 550 } 551 552 /** 553 * {@inheritDoc} 554 */ 555 @Override 556 public boolean dispatchUnhandledMove(View focused, int direction) { 557 return mFocused != null && 558 mFocused.dispatchUnhandledMove(focused, direction); 559 } 560 561 /** 562 * {@inheritDoc} 563 */ 564 public void clearChildFocus(View child) { 565 if (DBG) { 566 System.out.println(this + " clearChildFocus()"); 567 } 568 569 mFocused = null; 570 if (mParent != null) { 571 mParent.clearChildFocus(this); 572 } 573 } 574 575 /** 576 * {@inheritDoc} 577 */ 578 @Override 579 public void clearFocus() { 580 super.clearFocus(); 581 582 // clear any child focus if it exists 583 if (mFocused != null) { 584 mFocused.clearFocus(); 585 } 586 } 587 588 /** 589 * {@inheritDoc} 590 */ 591 @Override 592 void unFocus() { 593 if (DBG) { 594 System.out.println(this + " unFocus()"); 595 } 596 597 super.unFocus(); 598 if (mFocused != null) { 599 mFocused.unFocus(); 600 } 601 mFocused = null; 602 } 603 604 /** 605 * Returns the focused child of this view, if any. The child may have focus 606 * or contain focus. 607 * 608 * @return the focused child or null. 609 */ 610 public View getFocusedChild() { 611 return mFocused; 612 } 613 614 /** 615 * Returns true if this view has or contains focus 616 * 617 * @return true if this view has or contains focus 618 */ 619 @Override 620 public boolean hasFocus() { 621 return (mPrivateFlags & FOCUSED) != 0 || mFocused != null; 622 } 623 624 /* 625 * (non-Javadoc) 626 * 627 * @see android.view.View#findFocus() 628 */ 629 @Override 630 public View findFocus() { 631 if (DBG) { 632 System.out.println("Find focus in " + this + ": flags=" 633 + isFocused() + ", child=" + mFocused); 634 } 635 636 if (isFocused()) { 637 return this; 638 } 639 640 if (mFocused != null) { 641 return mFocused.findFocus(); 642 } 643 return null; 644 } 645 646 /** 647 * {@inheritDoc} 648 */ 649 @Override 650 public boolean hasFocusable() { 651 if ((mViewFlags & VISIBILITY_MASK) != VISIBLE) { 652 return false; 653 } 654 655 if (isFocusable()) { 656 return true; 657 } 658 659 final int descendantFocusability = getDescendantFocusability(); 660 if (descendantFocusability != FOCUS_BLOCK_DESCENDANTS) { 661 final int count = mChildrenCount; 662 final View[] children = mChildren; 663 664 for (int i = 0; i < count; i++) { 665 final View child = children[i]; 666 if (child.hasFocusable()) { 667 return true; 668 } 669 } 670 } 671 672 return false; 673 } 674 675 /** 676 * {@inheritDoc} 677 */ 678 @Override 679 public void addFocusables(ArrayList<View> views, int direction) { 680 addFocusables(views, direction, FOCUSABLES_TOUCH_MODE); 681 } 682 683 /** 684 * {@inheritDoc} 685 */ 686 @Override 687 public void addFocusables(ArrayList<View> views, int direction, int focusableMode) { 688 final int focusableCount = views.size(); 689 690 final int descendantFocusability = getDescendantFocusability(); 691 692 if (descendantFocusability != FOCUS_BLOCK_DESCENDANTS) { 693 final int count = mChildrenCount; 694 final View[] children = mChildren; 695 696 for (int i = 0; i < count; i++) { 697 final View child = children[i]; 698 if ((child.mViewFlags & VISIBILITY_MASK) == VISIBLE) { 699 child.addFocusables(views, direction, focusableMode); 700 } 701 } 702 } 703 704 // we add ourselves (if focusable) in all cases except for when we are 705 // FOCUS_AFTER_DESCENDANTS and there are some descendants focusable. this is 706 // to avoid the focus search finding layouts when a more precise search 707 // among the focusable children would be more interesting. 708 if ( 709 descendantFocusability != FOCUS_AFTER_DESCENDANTS || 710 // No focusable descendants 711 (focusableCount == views.size())) { 712 super.addFocusables(views, direction, focusableMode); 713 } 714 } 715 716 /** 717 * {@inheritDoc} 718 */ 719 @Override 720 public void dispatchWindowFocusChanged(boolean hasFocus) { 721 super.dispatchWindowFocusChanged(hasFocus); 722 final int count = mChildrenCount; 723 final View[] children = mChildren; 724 for (int i = 0; i < count; i++) { 725 children[i].dispatchWindowFocusChanged(hasFocus); 726 } 727 } 728 729 /** 730 * {@inheritDoc} 731 */ 732 @Override 733 public void addTouchables(ArrayList<View> views) { 734 super.addTouchables(views); 735 736 final int count = mChildrenCount; 737 final View[] children = mChildren; 738 739 for (int i = 0; i < count; i++) { 740 final View child = children[i]; 741 if ((child.mViewFlags & VISIBILITY_MASK) == VISIBLE) { 742 child.addTouchables(views); 743 } 744 } 745 } 746 747 /** 748 * {@inheritDoc} 749 */ 750 @Override 751 public void dispatchDisplayHint(int hint) { 752 super.dispatchDisplayHint(hint); 753 final int count = mChildrenCount; 754 final View[] children = mChildren; 755 for (int i = 0; i < count; i++) { 756 children[i].dispatchDisplayHint(hint); 757 } 758 } 759 760 /** 761 * @hide 762 * @param child 763 * @param visibility 764 */ 765 void onChildVisibilityChanged(View child, int visibility) { 766 if (mTransition != null) { 767 if (visibility == VISIBLE) { 768 mTransition.showChild(this, child); 769 } else { 770 mTransition.hideChild(this, child); 771 } 772 if (visibility != VISIBLE) { 773 // Only track this on disappearing views - appearing views are already visible 774 // and don't need special handling during drawChild() 775 if (mVisibilityChangingChildren == null) { 776 mVisibilityChangingChildren = new ArrayList<View>(); 777 } 778 mVisibilityChangingChildren.add(child); 779 if (mTransitioningViews != null && mTransitioningViews.contains(child)) { 780 addDisappearingView(child); 781 } 782 } 783 } 784 } 785 786 /** 787 * {@inheritDoc} 788 */ 789 @Override 790 protected void dispatchVisibilityChanged(View changedView, int visibility) { 791 super.dispatchVisibilityChanged(changedView, visibility); 792 final int count = mChildrenCount; 793 final View[] children = mChildren; 794 for (int i = 0; i < count; i++) { 795 children[i].dispatchVisibilityChanged(changedView, visibility); 796 } 797 } 798 799 /** 800 * {@inheritDoc} 801 */ 802 @Override 803 public void dispatchWindowVisibilityChanged(int visibility) { 804 super.dispatchWindowVisibilityChanged(visibility); 805 final int count = mChildrenCount; 806 final View[] children = mChildren; 807 for (int i = 0; i < count; i++) { 808 children[i].dispatchWindowVisibilityChanged(visibility); 809 } 810 } 811 812 /** 813 * {@inheritDoc} 814 */ 815 @Override 816 public void dispatchConfigurationChanged(Configuration newConfig) { 817 super.dispatchConfigurationChanged(newConfig); 818 final int count = mChildrenCount; 819 final View[] children = mChildren; 820 for (int i = 0; i < count; i++) { 821 children[i].dispatchConfigurationChanged(newConfig); 822 } 823 } 824 825 /** 826 * {@inheritDoc} 827 */ 828 public void recomputeViewAttributes(View child) { 829 ViewParent parent = mParent; 830 if (parent != null) parent.recomputeViewAttributes(this); 831 } 832 833 @Override 834 void dispatchCollectViewAttributes(int visibility) { 835 visibility |= mViewFlags&VISIBILITY_MASK; 836 super.dispatchCollectViewAttributes(visibility); 837 final int count = mChildrenCount; 838 final View[] children = mChildren; 839 for (int i = 0; i < count; i++) { 840 children[i].dispatchCollectViewAttributes(visibility); 841 } 842 } 843 844 /** 845 * {@inheritDoc} 846 */ 847 public void bringChildToFront(View child) { 848 int index = indexOfChild(child); 849 if (index >= 0) { 850 removeFromArray(index); 851 addInArray(child, mChildrenCount); 852 child.mParent = this; 853 } 854 } 855 856 /** 857 * {@inheritDoc} 858 * 859 * !!! TODO: write real docs 860 */ 861 @Override 862 public boolean dispatchDragEvent(DragEvent event) { 863 boolean retval = false; 864 final float tx = event.mX; 865 final float ty = event.mY; 866 867 ViewRoot root = getViewRoot(); 868 869 // Dispatch down the view hierarchy 870 switch (event.mAction) { 871 case DragEvent.ACTION_DRAG_STARTED: { 872 // clear state to recalculate which views we drag over 873 root.setDragFocus(event, null); 874 875 // Now dispatch down to our children, caching the responses 876 mChildAcceptsDrag = false; 877 final int count = mChildrenCount; 878 final View[] children = mChildren; 879 for (int i = 0; i < count; i++) { 880 final View child = children[i]; 881 if (child.getVisibility() == VISIBLE) { 882 final boolean handled = children[i].dispatchDragEvent(event); 883 children[i].mCanAcceptDrop = handled; 884 if (handled) { 885 mChildAcceptsDrag = true; 886 } 887 } 888 } 889 890 // Return HANDLED if one of our children can accept the drag 891 if (mChildAcceptsDrag) { 892 retval = true; 893 } 894 } break; 895 896 case DragEvent.ACTION_DRAG_ENDED: { 897 // Notify all of our children that the drag is over 898 final int count = mChildrenCount; 899 final View[] children = mChildren; 900 for (int i = 0; i < count; i++) { 901 final View child = children[i]; 902 if (child.getVisibility() == VISIBLE) { 903 child.dispatchDragEvent(event); 904 } 905 } 906 // We consider drag-ended to have been handled if one of our children 907 // had offered to handle the drag. 908 if (mChildAcceptsDrag) { 909 retval = true; 910 } 911 } break; 912 913 case DragEvent.ACTION_DRAG_LOCATION: { 914 // Find the [possibly new] drag target 915 final View target = findFrontmostDroppableChildAt(event.mX, event.mY, mLocalPoint); 916 917 // If we've changed apparent drag target, tell the view root which view 918 // we're over now. This will in turn send out DRAG_ENTERED / DRAG_EXITED 919 // notifications as appropriate. 920 if (mCurrentDragView != target) { 921 root.setDragFocus(event, target); 922 mCurrentDragView = target; 923 } 924 925 // Dispatch the actual drag location notice, localized into its coordinates 926 if (target != null) { 927 event.mX = mLocalPoint.x; 928 event.mY = mLocalPoint.y; 929 930 retval = target.dispatchDragEvent(event); 931 932 event.mX = tx; 933 event.mY = ty; 934 } 935 } break; 936 937 case DragEvent.ACTION_DROP: { 938 if (ViewDebug.DEBUG_DRAG) Log.d(View.VIEW_LOG_TAG, "Drop event: " + event); 939 View target = findFrontmostDroppableChildAt(event.mX, event.mY, mLocalPoint); 940 if (target != null) { 941 if (ViewDebug.DEBUG_DRAG) Log.d(View.VIEW_LOG_TAG, " dispatch drop to " + target); 942 event.mX = mLocalPoint.x; 943 event.mY = mLocalPoint.y; 944 retval = target.dispatchDragEvent(event); 945 event.mX = tx; 946 event.mY = ty; 947 } else { 948 if (ViewDebug.DEBUG_DRAG) { 949 Log.d(View.VIEW_LOG_TAG, " not dropped on an accepting view"); 950 } 951 } 952 } break; 953 } 954 955 // If none of our children could handle the event, try here 956 if (!retval) { 957 // Call up to the View implementation that dispatches to installed listeners 958 retval = super.dispatchDragEvent(event); 959 } 960 return retval; 961 } 962 963 // Find the frontmost child view that lies under the given point, and calculate 964 // the position within its own local coordinate system. 965 View findFrontmostDroppableChildAt(float x, float y, PointF outLocalPoint) { 966 final int count = mChildrenCount; 967 final View[] children = mChildren; 968 for (int i = count - 1; i >= 0; i--) { 969 final View child = children[i]; 970 if (!child.mCanAcceptDrop) { 971 continue; 972 } 973 974 if (isTransformedTouchPointInView(x, y, child, outLocalPoint)) { 975 return child; 976 } 977 } 978 return null; 979 } 980 981 /** 982 * {@inheritDoc} 983 */ 984 @Override 985 public boolean dispatchKeyEventPreIme(KeyEvent event) { 986 if ((mPrivateFlags & (FOCUSED | HAS_BOUNDS)) == (FOCUSED | HAS_BOUNDS)) { 987 return super.dispatchKeyEventPreIme(event); 988 } else if (mFocused != null && (mFocused.mPrivateFlags & HAS_BOUNDS) == HAS_BOUNDS) { 989 return mFocused.dispatchKeyEventPreIme(event); 990 } 991 return false; 992 } 993 994 /** 995 * {@inheritDoc} 996 */ 997 @Override 998 public boolean dispatchKeyEvent(KeyEvent event) { 999 if ((mPrivateFlags & (FOCUSED | HAS_BOUNDS)) == (FOCUSED | HAS_BOUNDS)) { 1000 return super.dispatchKeyEvent(event); 1001 } else if (mFocused != null && (mFocused.mPrivateFlags & HAS_BOUNDS) == HAS_BOUNDS) { 1002 return mFocused.dispatchKeyEvent(event); 1003 } 1004 return false; 1005 } 1006 1007 /** 1008 * {@inheritDoc} 1009 */ 1010 @Override 1011 public boolean dispatchKeyShortcutEvent(KeyEvent event) { 1012 if ((mPrivateFlags & (FOCUSED | HAS_BOUNDS)) == (FOCUSED | HAS_BOUNDS)) { 1013 return super.dispatchKeyShortcutEvent(event); 1014 } else if (mFocused != null && (mFocused.mPrivateFlags & HAS_BOUNDS) == HAS_BOUNDS) { 1015 return mFocused.dispatchKeyShortcutEvent(event); 1016 } 1017 return false; 1018 } 1019 1020 /** 1021 * {@inheritDoc} 1022 */ 1023 @Override 1024 public boolean dispatchTrackballEvent(MotionEvent event) { 1025 if ((mPrivateFlags & (FOCUSED | HAS_BOUNDS)) == (FOCUSED | HAS_BOUNDS)) { 1026 return super.dispatchTrackballEvent(event); 1027 } else if (mFocused != null && (mFocused.mPrivateFlags & HAS_BOUNDS) == HAS_BOUNDS) { 1028 return mFocused.dispatchTrackballEvent(event); 1029 } 1030 return false; 1031 } 1032 1033 /** 1034 * {@inheritDoc} 1035 */ 1036 @Override 1037 public boolean dispatchTouchEvent(MotionEvent ev) { 1038 if (!onFilterTouchEventForSecurity(ev)) { 1039 return false; 1040 } 1041 1042 final int action = ev.getAction(); 1043 final int actionMasked = action & MotionEvent.ACTION_MASK; 1044 1045 // Handle an initial down. 1046 if (actionMasked == MotionEvent.ACTION_DOWN) { 1047 // Throw away all previous state when starting a new touch gesture. 1048 // The framework may have dropped the up or cancel event for the previous gesture 1049 // due to an app switch, ANR, or some other state change. 1050 cancelAndClearTouchTargets(ev); 1051 resetTouchState(); 1052 } 1053 1054 // Check for interception. 1055 final boolean intercepted; 1056 if (actionMasked == MotionEvent.ACTION_DOWN || mFirstTouchTarget != null) { 1057 final boolean disallowIntercept = (mGroupFlags & FLAG_DISALLOW_INTERCEPT) != 0; 1058 if (!disallowIntercept) { 1059 intercepted = onInterceptTouchEvent(ev); 1060 ev.setAction(action); // restore action in case onInterceptTouchEvent() changed it 1061 } else { 1062 intercepted = false; 1063 } 1064 } else { 1065 intercepted = true; 1066 } 1067 1068 // Check for cancelation. 1069 final boolean canceled = resetCancelNextUpFlag(this) 1070 || actionMasked == MotionEvent.ACTION_CANCEL; 1071 1072 // Update list of touch targets for pointer down, if needed. 1073 final boolean split = (mGroupFlags & FLAG_SPLIT_MOTION_EVENTS) != 0; 1074 TouchTarget newTouchTarget = null; 1075 boolean alreadyDispatchedToNewTouchTarget = false; 1076 if (!canceled && !intercepted) { 1077 if (actionMasked == MotionEvent.ACTION_DOWN 1078 || (split && actionMasked == MotionEvent.ACTION_POINTER_DOWN)) { 1079 final int actionIndex = ev.getActionIndex(); // always 0 for down 1080 final int idBitsToAssign = split ? 1 << ev.getPointerId(actionIndex) 1081 : TouchTarget.ALL_POINTER_IDS; 1082 1083 // Clean up earlier touch targets for this pointer id in case they 1084 // have become out of sync. 1085 removePointersFromTouchTargets(idBitsToAssign); 1086 1087 final int childrenCount = mChildrenCount; 1088 if (childrenCount != 0) { 1089 // Find a child that can receive the event. Scan children from front to back. 1090 final View[] children = mChildren; 1091 final float x = ev.getX(actionIndex); 1092 final float y = ev.getY(actionIndex); 1093 1094 for (int i = childrenCount - 1; i >= 0; i--) { 1095 final View child = children[i]; 1096 if ((child.mViewFlags & VISIBILITY_MASK) != VISIBLE 1097 && child.getAnimation() == null) { 1098 // Skip invisible child unless it is animating. 1099 continue; 1100 } 1101 1102 if (!isTransformedTouchPointInView(x, y, child, null)) { 1103 // New pointer is out of child's bounds. 1104 continue; 1105 } 1106 1107 newTouchTarget = getTouchTarget(child); 1108 if (newTouchTarget != null) { 1109 // Child is already receiving touch within its bounds. 1110 // Give it the new pointer in addition to the ones it is handling. 1111 newTouchTarget.pointerIdBits |= idBitsToAssign; 1112 break; 1113 } 1114 1115 resetCancelNextUpFlag(child); 1116 if (dispatchTransformedTouchEvent(ev, false, child, idBitsToAssign)) { 1117 // Child wants to receive touch within its bounds. 1118 newTouchTarget = addTouchTarget(child, idBitsToAssign); 1119 alreadyDispatchedToNewTouchTarget = true; 1120 break; 1121 } 1122 } 1123 } 1124 1125 if (newTouchTarget == null && mFirstTouchTarget != null) { 1126 // Did not find a child to receive the event. 1127 // Assign the pointer to the least recently added target. 1128 newTouchTarget = mFirstTouchTarget; 1129 while (newTouchTarget.next != null) { 1130 newTouchTarget = newTouchTarget.next; 1131 } 1132 newTouchTarget.pointerIdBits |= idBitsToAssign; 1133 } 1134 } 1135 } 1136 1137 // Dispatch to touch targets. 1138 boolean handled = false; 1139 if (mFirstTouchTarget == null) { 1140 // No touch targets so treat this as an ordinary view. 1141 handled = dispatchTransformedTouchEvent(ev, canceled, null, 1142 TouchTarget.ALL_POINTER_IDS); 1143 } else { 1144 // Dispatch to touch targets, excluding the new touch target if we already 1145 // dispatched to it. Cancel touch targets if necessary. 1146 TouchTarget predecessor = null; 1147 TouchTarget target = mFirstTouchTarget; 1148 while (target != null) { 1149 final TouchTarget next = target.next; 1150 if (alreadyDispatchedToNewTouchTarget && target == newTouchTarget) { 1151 handled = true; 1152 } else { 1153 final boolean cancelChild = resetCancelNextUpFlag(target.child) || intercepted; 1154 if (dispatchTransformedTouchEvent(ev, cancelChild, 1155 target.child, target.pointerIdBits)) { 1156 handled = true; 1157 } 1158 if (cancelChild) { 1159 if (predecessor == null) { 1160 mFirstTouchTarget = next; 1161 } else { 1162 predecessor.next = next; 1163 } 1164 target.recycle(); 1165 target = next; 1166 continue; 1167 } 1168 } 1169 predecessor = target; 1170 target = next; 1171 } 1172 } 1173 1174 // Update list of touch targets for pointer up or cancel, if needed. 1175 if (canceled || actionMasked == MotionEvent.ACTION_UP) { 1176 resetTouchState(); 1177 } else if (split && actionMasked == MotionEvent.ACTION_POINTER_UP) { 1178 final int actionIndex = ev.getActionIndex(); 1179 final int idBitsToRemove = 1 << ev.getPointerId(actionIndex); 1180 removePointersFromTouchTargets(idBitsToRemove); 1181 } 1182 1183 return handled; 1184 } 1185 1186 /** 1187 * Resets all touch state in preparation for a new cycle. 1188 */ 1189 private void resetTouchState() { 1190 clearTouchTargets(); 1191 resetCancelNextUpFlag(this); 1192 mGroupFlags &= ~FLAG_DISALLOW_INTERCEPT; 1193 } 1194 1195 /** 1196 * Resets the cancel next up flag. 1197 * Returns true if the flag was previously set. 1198 */ 1199 private boolean resetCancelNextUpFlag(View view) { 1200 if ((view.mPrivateFlags & CANCEL_NEXT_UP_EVENT) != 0) { 1201 view.mPrivateFlags &= ~CANCEL_NEXT_UP_EVENT; 1202 return true; 1203 } 1204 return false; 1205 } 1206 1207 /** 1208 * Clears all touch targets. 1209 */ 1210 private void clearTouchTargets() { 1211 TouchTarget target = mFirstTouchTarget; 1212 if (target != null) { 1213 do { 1214 TouchTarget next = target.next; 1215 target.recycle(); 1216 target = next; 1217 } while (target != null); 1218 mFirstTouchTarget = null; 1219 } 1220 } 1221 1222 /** 1223 * Cancels and clears all touch targets. 1224 */ 1225 private void cancelAndClearTouchTargets(MotionEvent event) { 1226 if (mFirstTouchTarget != null) { 1227 boolean syntheticEvent = false; 1228 if (event == null) { 1229 final long now = SystemClock.uptimeMillis(); 1230 event = MotionEvent.obtain(now, now, 1231 MotionEvent.ACTION_CANCEL, 0.0f, 0.0f, 0); 1232 syntheticEvent = true; 1233 } 1234 1235 for (TouchTarget target = mFirstTouchTarget; target != null; target = target.next) { 1236 resetCancelNextUpFlag(target.child); 1237 dispatchTransformedTouchEvent(event, true, target.child, target.pointerIdBits); 1238 } 1239 clearTouchTargets(); 1240 1241 if (syntheticEvent) { 1242 event.recycle(); 1243 } 1244 } 1245 } 1246 1247 /** 1248 * Gets the touch target for specified child view. 1249 * Returns null if not found. 1250 */ 1251 private TouchTarget getTouchTarget(View child) { 1252 for (TouchTarget target = mFirstTouchTarget; target != null; target = target.next) { 1253 if (target.child == child) { 1254 return target; 1255 } 1256 } 1257 return null; 1258 } 1259 1260 /** 1261 * Adds a touch target for specified child to the beginning of the list. 1262 * Assumes the target child is not already present. 1263 */ 1264 private TouchTarget addTouchTarget(View child, int pointerIdBits) { 1265 TouchTarget target = TouchTarget.obtain(child, pointerIdBits); 1266 target.next = mFirstTouchTarget; 1267 mFirstTouchTarget = target; 1268 return target; 1269 } 1270 1271 /** 1272 * Removes the pointer ids from consideration. 1273 */ 1274 private void removePointersFromTouchTargets(int pointerIdBits) { 1275 TouchTarget predecessor = null; 1276 TouchTarget target = mFirstTouchTarget; 1277 while (target != null) { 1278 final TouchTarget next = target.next; 1279 if ((target.pointerIdBits & pointerIdBits) != 0) { 1280 target.pointerIdBits &= ~pointerIdBits; 1281 if (target.pointerIdBits == 0) { 1282 if (predecessor == null) { 1283 mFirstTouchTarget = next; 1284 } else { 1285 predecessor.next = next; 1286 } 1287 target.recycle(); 1288 target = next; 1289 continue; 1290 } 1291 } 1292 predecessor = target; 1293 target = next; 1294 } 1295 } 1296 1297 /** 1298 * Returns true if a child view contains the specified point when transformed 1299 * into its coordinate space. 1300 * Child must not be null. 1301 */ 1302 private boolean isTransformedTouchPointInView(float x, float y, View child, 1303 PointF outLocalPoint) { 1304 float localX = x + mScrollX - child.mLeft; 1305 float localY = y + mScrollY - child.mTop; 1306 if (! child.hasIdentityMatrix() && mAttachInfo != null) { 1307 final float[] localXY = mAttachInfo.mTmpTransformLocation; 1308 localXY[0] = localX; 1309 localXY[1] = localY; 1310 child.getInverseMatrix().mapPoints(localXY); 1311 localX = localXY[0]; 1312 localY = localXY[1]; 1313 } 1314 final boolean isInView = child.pointInView(localX, localY); 1315 if (isInView && outLocalPoint != null) { 1316 outLocalPoint.set(localX, localY); 1317 } 1318 return isInView; 1319 } 1320 1321 /** 1322 * Transforms a motion event into the coordinate space of a particular child view, 1323 * filters out irrelevant pointer ids, and overrides its action if necessary. 1324 * If child is null, assumes the MotionEvent will be sent to this ViewGroup instead. 1325 */ 1326 private boolean dispatchTransformedTouchEvent(MotionEvent event, boolean cancel, 1327 View child, int desiredPointerIdBits) { 1328 final boolean handled; 1329 1330 // Canceling motions is a special case. We don't need to perform any transformations 1331 // or filtering. The important part is the action, not the contents. 1332 final int oldAction = event.getAction(); 1333 if (cancel || oldAction == MotionEvent.ACTION_CANCEL) { 1334 event.setAction(MotionEvent.ACTION_CANCEL); 1335 if (child == null) { 1336 handled = super.dispatchTouchEvent(event); 1337 } else { 1338 handled = child.dispatchTouchEvent(event); 1339 } 1340 event.setAction(oldAction); 1341 return handled; 1342 } 1343 1344 // Calculate the number of pointers to deliver. 1345 final int oldPointerCount = event.getPointerCount(); 1346 int newPointerCount = 0; 1347 if (desiredPointerIdBits == TouchTarget.ALL_POINTER_IDS) { 1348 newPointerCount = oldPointerCount; 1349 } else { 1350 for (int i = 0; i < oldPointerCount; i++) { 1351 final int pointerId = event.getPointerId(i); 1352 final int pointerIdBit = 1 << pointerId; 1353 if ((pointerIdBit & desiredPointerIdBits) != 0) { 1354 newPointerCount += 1; 1355 } 1356 } 1357 } 1358 1359 // If for some reason we ended up in an inconsistent state where it looks like we 1360 // might produce a motion event with no pointers in it, then drop the event. 1361 if (newPointerCount == 0) { 1362 return false; 1363 } 1364 1365 // If the number of pointers is the same and we don't need to perform any fancy 1366 // irreversible transformations, then we can reuse the motion event for this 1367 // dispatch as long as we are careful to revert any changes we make. 1368 final boolean reuse = newPointerCount == oldPointerCount 1369 && (child == null || child.hasIdentityMatrix()); 1370 if (reuse) { 1371 if (child == null) { 1372 handled = super.dispatchTouchEvent(event); 1373 } else { 1374 final float offsetX = mScrollX - child.mLeft; 1375 final float offsetY = mScrollY - child.mTop; 1376 event.offsetLocation(offsetX, offsetY); 1377 1378 handled = child.dispatchTouchEvent(event); 1379 1380 event.offsetLocation(-offsetX, -offsetY); 1381 } 1382 return handled; 1383 } 1384 1385 // Make a copy of the event. 1386 // If the number of pointers is different, then we need to filter out irrelevant pointers 1387 // as we make a copy of the motion event. 1388 MotionEvent transformedEvent; 1389 if (newPointerCount == oldPointerCount) { 1390 transformedEvent = MotionEvent.obtain(event); 1391 } else { 1392 growTmpPointerArrays(newPointerCount); 1393 final int[] newPointerIndexMap = mTmpPointerIndexMap; 1394 final int[] newPointerIds = mTmpPointerIds; 1395 final MotionEvent.PointerCoords[] newPointerCoords = mTmpPointerCoords; 1396 1397 int newPointerIndex = 0; 1398 int oldPointerIndex = 0; 1399 while (newPointerIndex < newPointerCount) { 1400 final int pointerId = event.getPointerId(oldPointerIndex); 1401 final int pointerIdBits = 1 << pointerId; 1402 if ((pointerIdBits & desiredPointerIdBits) != 0) { 1403 newPointerIndexMap[newPointerIndex] = oldPointerIndex; 1404 newPointerIds[newPointerIndex] = pointerId; 1405 if (newPointerCoords[newPointerIndex] == null) { 1406 newPointerCoords[newPointerIndex] = new MotionEvent.PointerCoords(); 1407 } 1408 1409 newPointerIndex += 1; 1410 } 1411 oldPointerIndex += 1; 1412 } 1413 1414 final int newAction; 1415 if (cancel) { 1416 newAction = MotionEvent.ACTION_CANCEL; 1417 } else { 1418 final int oldMaskedAction = oldAction & MotionEvent.ACTION_MASK; 1419 if (oldMaskedAction == MotionEvent.ACTION_POINTER_DOWN 1420 || oldMaskedAction == MotionEvent.ACTION_POINTER_UP) { 1421 final int changedPointerId = event.getPointerId( 1422 (oldAction & MotionEvent.ACTION_POINTER_INDEX_MASK) 1423 >> MotionEvent.ACTION_POINTER_INDEX_SHIFT); 1424 final int changedPointerIdBits = 1 << changedPointerId; 1425 if ((changedPointerIdBits & desiredPointerIdBits) != 0) { 1426 if (newPointerCount == 1) { 1427 // The first/last pointer went down/up. 1428 newAction = oldMaskedAction == MotionEvent.ACTION_POINTER_DOWN 1429 ? MotionEvent.ACTION_DOWN : MotionEvent.ACTION_UP; 1430 } else { 1431 // A secondary pointer went down/up. 1432 int newChangedPointerIndex = 0; 1433 while (newPointerIds[newChangedPointerIndex] != changedPointerId) { 1434 newChangedPointerIndex += 1; 1435 } 1436 newAction = oldMaskedAction | (newChangedPointerIndex 1437 << MotionEvent.ACTION_POINTER_INDEX_SHIFT); 1438 } 1439 } else { 1440 // An unrelated pointer changed. 1441 newAction = MotionEvent.ACTION_MOVE; 1442 } 1443 } else { 1444 // Simple up/down/cancel/move motion action. 1445 newAction = oldMaskedAction; 1446 } 1447 } 1448 1449 transformedEvent = null; 1450 final int historySize = event.getHistorySize(); 1451 for (int historyIndex = 0; historyIndex <= historySize; historyIndex++) { 1452 for (newPointerIndex = 0; newPointerIndex < newPointerCount; newPointerIndex++) { 1453 final MotionEvent.PointerCoords c = newPointerCoords[newPointerIndex]; 1454 oldPointerIndex = newPointerIndexMap[newPointerIndex]; 1455 if (historyIndex != historySize) { 1456 event.getHistoricalPointerCoords(oldPointerIndex, historyIndex, c); 1457 } else { 1458 event.getPointerCoords(oldPointerIndex, c); 1459 } 1460 } 1461 1462 final long eventTime; 1463 if (historyIndex != historySize) { 1464 eventTime = event.getHistoricalEventTime(historyIndex); 1465 } else { 1466 eventTime = event.getEventTime(); 1467 } 1468 1469 if (transformedEvent == null) { 1470 transformedEvent = MotionEvent.obtain( 1471 event.getDownTime(), eventTime, newAction, 1472 newPointerCount, newPointerIds, newPointerCoords, 1473 event.getMetaState(), event.getXPrecision(), event.getYPrecision(), 1474 event.getDeviceId(), event.getEdgeFlags(), event.getSource(), 1475 event.getFlags()); 1476 } else { 1477 transformedEvent.addBatch(eventTime, newPointerCoords, 0); 1478 } 1479 } 1480 } 1481 1482 // Perform any necessary transformations and dispatch. 1483 if (child == null) { 1484 handled = super.dispatchTouchEvent(transformedEvent); 1485 } else { 1486 final float offsetX = mScrollX - child.mLeft; 1487 final float offsetY = mScrollY - child.mTop; 1488 transformedEvent.offsetLocation(offsetX, offsetY); 1489 if (! child.hasIdentityMatrix()) { 1490 transformedEvent.transform(child.getInverseMatrix()); 1491 } 1492 1493 handled = child.dispatchTouchEvent(transformedEvent); 1494 } 1495 1496 // Done. 1497 transformedEvent.recycle(); 1498 return handled; 1499 } 1500 1501 /** 1502 * Enlarge the temporary pointer arrays for splitting pointers. 1503 * May discard contents (but keeps PointerCoords objects to avoid reallocating them). 1504 */ 1505 private void growTmpPointerArrays(int desiredCapacity) { 1506 final MotionEvent.PointerCoords[] oldTmpPointerCoords = mTmpPointerCoords; 1507 int capacity; 1508 if (oldTmpPointerCoords != null) { 1509 capacity = oldTmpPointerCoords.length; 1510 if (desiredCapacity <= capacity) { 1511 return; 1512 } 1513 } else { 1514 capacity = 4; 1515 } 1516 1517 while (capacity < desiredCapacity) { 1518 capacity *= 2; 1519 } 1520 1521 mTmpPointerIndexMap = new int[capacity]; 1522 mTmpPointerIds = new int[capacity]; 1523 mTmpPointerCoords = new MotionEvent.PointerCoords[capacity]; 1524 1525 if (oldTmpPointerCoords != null) { 1526 System.arraycopy(oldTmpPointerCoords, 0, mTmpPointerCoords, 0, 1527 oldTmpPointerCoords.length); 1528 } 1529 } 1530 1531 /** 1532 * Enable or disable the splitting of MotionEvents to multiple children during touch event 1533 * dispatch. This behavior is disabled by default. 1534 * 1535 * <p>When this option is enabled MotionEvents may be split and dispatched to different child 1536 * views depending on where each pointer initially went down. This allows for user interactions 1537 * such as scrolling two panes of content independently, chording of buttons, and performing 1538 * independent gestures on different pieces of content. 1539 * 1540 * @param split <code>true</code> to allow MotionEvents to be split and dispatched to multiple 1541 * child views. <code>false</code> to only allow one child view to be the target of 1542 * any MotionEvent received by this ViewGroup. 1543 */ 1544 public void setMotionEventSplittingEnabled(boolean split) { 1545 // TODO Applications really shouldn't change this setting mid-touch event, 1546 // but perhaps this should handle that case and send ACTION_CANCELs to any child views 1547 // with gestures in progress when this is changed. 1548 if (split) { 1549 mGroupFlags |= FLAG_SPLIT_MOTION_EVENTS; 1550 } else { 1551 mGroupFlags &= ~FLAG_SPLIT_MOTION_EVENTS; 1552 } 1553 } 1554 1555 /** 1556 * @return true if MotionEvents dispatched to this ViewGroup can be split to multiple children. 1557 */ 1558 public boolean isMotionEventSplittingEnabled() { 1559 return (mGroupFlags & FLAG_SPLIT_MOTION_EVENTS) == FLAG_SPLIT_MOTION_EVENTS; 1560 } 1561 1562 /** 1563 * {@inheritDoc} 1564 */ 1565 public void requestDisallowInterceptTouchEvent(boolean disallowIntercept) { 1566 1567 if (disallowIntercept == ((mGroupFlags & FLAG_DISALLOW_INTERCEPT) != 0)) { 1568 // We're already in this state, assume our ancestors are too 1569 return; 1570 } 1571 1572 if (disallowIntercept) { 1573 mGroupFlags |= FLAG_DISALLOW_INTERCEPT; 1574 } else { 1575 mGroupFlags &= ~FLAG_DISALLOW_INTERCEPT; 1576 } 1577 1578 // Pass it up to our parent 1579 if (mParent != null) { 1580 mParent.requestDisallowInterceptTouchEvent(disallowIntercept); 1581 } 1582 } 1583 1584 /** 1585 * Implement this method to intercept all touch screen motion events. This 1586 * allows you to watch events as they are dispatched to your children, and 1587 * take ownership of the current gesture at any point. 1588 * 1589 * <p>Using this function takes some care, as it has a fairly complicated 1590 * interaction with {@link View#onTouchEvent(MotionEvent) 1591 * View.onTouchEvent(MotionEvent)}, and using it requires implementing 1592 * that method as well as this one in the correct way. Events will be 1593 * received in the following order: 1594 * 1595 * <ol> 1596 * <li> You will receive the down event here. 1597 * <li> The down event will be handled either by a child of this view 1598 * group, or given to your own onTouchEvent() method to handle; this means 1599 * you should implement onTouchEvent() to return true, so you will 1600 * continue to see the rest of the gesture (instead of looking for 1601 * a parent view to handle it). Also, by returning true from 1602 * onTouchEvent(), you will not receive any following 1603 * events in onInterceptTouchEvent() and all touch processing must 1604 * happen in onTouchEvent() like normal. 1605 * <li> For as long as you return false from this function, each following 1606 * event (up to and including the final up) will be delivered first here 1607 * and then to the target's onTouchEvent(). 1608 * <li> If you return true from here, you will not receive any 1609 * following events: the target view will receive the same event but 1610 * with the action {@link MotionEvent#ACTION_CANCEL}, and all further 1611 * events will be delivered to your onTouchEvent() method and no longer 1612 * appear here. 1613 * </ol> 1614 * 1615 * @param ev The motion event being dispatched down the hierarchy. 1616 * @return Return true to steal motion events from the children and have 1617 * them dispatched to this ViewGroup through onTouchEvent(). 1618 * The current target will receive an ACTION_CANCEL event, and no further 1619 * messages will be delivered here. 1620 */ 1621 public boolean onInterceptTouchEvent(MotionEvent ev) { 1622 return false; 1623 } 1624 1625 /** 1626 * {@inheritDoc} 1627 * 1628 * Looks for a view to give focus to respecting the setting specified by 1629 * {@link #getDescendantFocusability()}. 1630 * 1631 * Uses {@link #onRequestFocusInDescendants(int, android.graphics.Rect)} to 1632 * find focus within the children of this group when appropriate. 1633 * 1634 * @see #FOCUS_BEFORE_DESCENDANTS 1635 * @see #FOCUS_AFTER_DESCENDANTS 1636 * @see #FOCUS_BLOCK_DESCENDANTS 1637 * @see #onRequestFocusInDescendants 1638 */ 1639 @Override 1640 public boolean requestFocus(int direction, Rect previouslyFocusedRect) { 1641 if (DBG) { 1642 System.out.println(this + " ViewGroup.requestFocus direction=" 1643 + direction); 1644 } 1645 int descendantFocusability = getDescendantFocusability(); 1646 1647 switch (descendantFocusability) { 1648 case FOCUS_BLOCK_DESCENDANTS: 1649 return super.requestFocus(direction, previouslyFocusedRect); 1650 case FOCUS_BEFORE_DESCENDANTS: { 1651 final boolean took = super.requestFocus(direction, previouslyFocusedRect); 1652 return took ? took : onRequestFocusInDescendants(direction, previouslyFocusedRect); 1653 } 1654 case FOCUS_AFTER_DESCENDANTS: { 1655 final boolean took = onRequestFocusInDescendants(direction, previouslyFocusedRect); 1656 return took ? took : super.requestFocus(direction, previouslyFocusedRect); 1657 } 1658 default: 1659 throw new IllegalStateException("descendant focusability must be " 1660 + "one of FOCUS_BEFORE_DESCENDANTS, FOCUS_AFTER_DESCENDANTS, FOCUS_BLOCK_DESCENDANTS " 1661 + "but is " + descendantFocusability); 1662 } 1663 } 1664 1665 /** 1666 * Look for a descendant to call {@link View#requestFocus} on. 1667 * Called by {@link ViewGroup#requestFocus(int, android.graphics.Rect)} 1668 * when it wants to request focus within its children. Override this to 1669 * customize how your {@link ViewGroup} requests focus within its children. 1670 * @param direction One of FOCUS_UP, FOCUS_DOWN, FOCUS_LEFT, and FOCUS_RIGHT 1671 * @param previouslyFocusedRect The rectangle (in this View's coordinate system) 1672 * to give a finer grained hint about where focus is coming from. May be null 1673 * if there is no hint. 1674 * @return Whether focus was taken. 1675 */ 1676 @SuppressWarnings({"ConstantConditions"}) 1677 protected boolean onRequestFocusInDescendants(int direction, 1678 Rect previouslyFocusedRect) { 1679 int index; 1680 int increment; 1681 int end; 1682 int count = mChildrenCount; 1683 if ((direction & FOCUS_FORWARD) != 0) { 1684 index = 0; 1685 increment = 1; 1686 end = count; 1687 } else { 1688 index = count - 1; 1689 increment = -1; 1690 end = -1; 1691 } 1692 final View[] children = mChildren; 1693 for (int i = index; i != end; i += increment) { 1694 View child = children[i]; 1695 if ((child.mViewFlags & VISIBILITY_MASK) == VISIBLE) { 1696 if (child.requestFocus(direction, previouslyFocusedRect)) { 1697 return true; 1698 } 1699 } 1700 } 1701 return false; 1702 } 1703 1704 /** 1705 * {@inheritDoc} 1706 * 1707 * @hide 1708 */ 1709 @Override 1710 public void dispatchStartTemporaryDetach() { 1711 super.dispatchStartTemporaryDetach(); 1712 final int count = mChildrenCount; 1713 final View[] children = mChildren; 1714 for (int i = 0; i < count; i++) { 1715 children[i].dispatchStartTemporaryDetach(); 1716 } 1717 } 1718 1719 /** 1720 * {@inheritDoc} 1721 * 1722 * @hide 1723 */ 1724 @Override 1725 public void dispatchFinishTemporaryDetach() { 1726 super.dispatchFinishTemporaryDetach(); 1727 final int count = mChildrenCount; 1728 final View[] children = mChildren; 1729 for (int i = 0; i < count; i++) { 1730 children[i].dispatchFinishTemporaryDetach(); 1731 } 1732 } 1733 1734 /** 1735 * {@inheritDoc} 1736 */ 1737 @Override 1738 void dispatchAttachedToWindow(AttachInfo info, int visibility) { 1739 super.dispatchAttachedToWindow(info, visibility); 1740 visibility |= mViewFlags & VISIBILITY_MASK; 1741 final int count = mChildrenCount; 1742 final View[] children = mChildren; 1743 for (int i = 0; i < count; i++) { 1744 children[i].dispatchAttachedToWindow(info, visibility); 1745 } 1746 } 1747 1748 @Override 1749 public boolean dispatchPopulateAccessibilityEvent(AccessibilityEvent event) { 1750 boolean populated = false; 1751 for (int i = 0, count = getChildCount(); i < count; i++) { 1752 populated |= getChildAt(i).dispatchPopulateAccessibilityEvent(event); 1753 } 1754 return populated; 1755 } 1756 1757 /** 1758 * {@inheritDoc} 1759 */ 1760 @Override 1761 void dispatchDetachedFromWindow() { 1762 // If we still have a touch target, we are still in the process of 1763 // dispatching motion events to a child; we need to get rid of that 1764 // child to avoid dispatching events to it after the window is torn 1765 // down. To make sure we keep the child in a consistent state, we 1766 // first send it an ACTION_CANCEL motion event. 1767 cancelAndClearTouchTargets(null); 1768 1769 final int count = mChildrenCount; 1770 final View[] children = mChildren; 1771 for (int i = 0; i < count; i++) { 1772 children[i].dispatchDetachedFromWindow(); 1773 } 1774 super.dispatchDetachedFromWindow(); 1775 } 1776 1777 /** 1778 * {@inheritDoc} 1779 */ 1780 @Override 1781 public void setPadding(int left, int top, int right, int bottom) { 1782 super.setPadding(left, top, right, bottom); 1783 1784 if ((mPaddingLeft | mPaddingTop | mPaddingRight | mPaddingRight) != 0) { 1785 mGroupFlags |= FLAG_PADDING_NOT_NULL; 1786 } else { 1787 mGroupFlags &= ~FLAG_PADDING_NOT_NULL; 1788 } 1789 } 1790 1791 /** 1792 * {@inheritDoc} 1793 */ 1794 @Override 1795 protected void dispatchSaveInstanceState(SparseArray<Parcelable> container) { 1796 super.dispatchSaveInstanceState(container); 1797 final int count = mChildrenCount; 1798 final View[] children = mChildren; 1799 for (int i = 0; i < count; i++) { 1800 View c = children[i]; 1801 if ((c.mViewFlags & PARENT_SAVE_DISABLED_MASK) != PARENT_SAVE_DISABLED) { 1802 c.dispatchSaveInstanceState(container); 1803 } 1804 } 1805 } 1806 1807 /** 1808 * Perform dispatching of a {@link #saveHierarchyState freeze()} to only this view, 1809 * not to its children. For use when overriding 1810 * {@link #dispatchSaveInstanceState dispatchFreeze()} to allow subclasses to freeze 1811 * their own state but not the state of their children. 1812 * 1813 * @param container the container 1814 */ 1815 protected void dispatchFreezeSelfOnly(SparseArray<Parcelable> container) { 1816 super.dispatchSaveInstanceState(container); 1817 } 1818 1819 /** 1820 * {@inheritDoc} 1821 */ 1822 @Override 1823 protected void dispatchRestoreInstanceState(SparseArray<Parcelable> container) { 1824 super.dispatchRestoreInstanceState(container); 1825 final int count = mChildrenCount; 1826 final View[] children = mChildren; 1827 for (int i = 0; i < count; i++) { 1828 View c = children[i]; 1829 if ((c.mViewFlags & PARENT_SAVE_DISABLED_MASK) != PARENT_SAVE_DISABLED) { 1830 c.dispatchRestoreInstanceState(container); 1831 } 1832 } 1833 } 1834 1835 /** 1836 * Perform dispatching of a {@link #restoreHierarchyState thaw()} to only this view, 1837 * not to its children. For use when overriding 1838 * {@link #dispatchRestoreInstanceState dispatchThaw()} to allow subclasses to thaw 1839 * their own state but not the state of their children. 1840 * 1841 * @param container the container 1842 */ 1843 protected void dispatchThawSelfOnly(SparseArray<Parcelable> container) { 1844 super.dispatchRestoreInstanceState(container); 1845 } 1846 1847 /** 1848 * Enables or disables the drawing cache for each child of this view group. 1849 * 1850 * @param enabled true to enable the cache, false to dispose of it 1851 */ 1852 protected void setChildrenDrawingCacheEnabled(boolean enabled) { 1853 if (enabled || (mPersistentDrawingCache & PERSISTENT_ALL_CACHES) != PERSISTENT_ALL_CACHES) { 1854 final View[] children = mChildren; 1855 final int count = mChildrenCount; 1856 for (int i = 0; i < count; i++) { 1857 children[i].setDrawingCacheEnabled(enabled); 1858 } 1859 } 1860 } 1861 1862 @Override 1863 protected void onAnimationStart() { 1864 super.onAnimationStart(); 1865 1866 // When this ViewGroup's animation starts, build the cache for the children 1867 if ((mGroupFlags & FLAG_ANIMATION_CACHE) == FLAG_ANIMATION_CACHE) { 1868 final int count = mChildrenCount; 1869 final View[] children = mChildren; 1870 1871 for (int i = 0; i < count; i++) { 1872 final View child = children[i]; 1873 if ((child.mViewFlags & VISIBILITY_MASK) == VISIBLE) { 1874 child.setDrawingCacheEnabled(true); 1875 child.buildDrawingCache(true); 1876 } 1877 } 1878 1879 mGroupFlags |= FLAG_CHILDREN_DRAWN_WITH_CACHE; 1880 } 1881 } 1882 1883 @Override 1884 protected void onAnimationEnd() { 1885 super.onAnimationEnd(); 1886 1887 // When this ViewGroup's animation ends, destroy the cache of the children 1888 if ((mGroupFlags & FLAG_ANIMATION_CACHE) == FLAG_ANIMATION_CACHE) { 1889 mGroupFlags &= ~FLAG_CHILDREN_DRAWN_WITH_CACHE; 1890 1891 if ((mPersistentDrawingCache & PERSISTENT_ANIMATION_CACHE) == 0) { 1892 setChildrenDrawingCacheEnabled(false); 1893 } 1894 } 1895 } 1896 1897 @Override 1898 Bitmap createSnapshot(Bitmap.Config quality, int backgroundColor, boolean skipChildren) { 1899 int count = mChildrenCount; 1900 int[] visibilities = null; 1901 1902 if (skipChildren) { 1903 visibilities = new int[count]; 1904 for (int i = 0; i < count; i++) { 1905 View child = getChildAt(i); 1906 visibilities[i] = child.getVisibility(); 1907 if (visibilities[i] == View.VISIBLE) { 1908 child.setVisibility(INVISIBLE); 1909 } 1910 } 1911 } 1912 1913 Bitmap b = super.createSnapshot(quality, backgroundColor, skipChildren); 1914 1915 if (skipChildren) { 1916 for (int i = 0; i < count; i++) { 1917 getChildAt(i).setVisibility(visibilities[i]); 1918 } 1919 } 1920 1921 return b; 1922 } 1923 1924 /** 1925 * {@inheritDoc} 1926 */ 1927 @Override 1928 protected void dispatchDraw(Canvas canvas) { 1929 final int count = mChildrenCount; 1930 final View[] children = mChildren; 1931 int flags = mGroupFlags; 1932 1933 if ((flags & FLAG_RUN_ANIMATION) != 0 && canAnimate()) { 1934 final boolean cache = (mGroupFlags & FLAG_ANIMATION_CACHE) == FLAG_ANIMATION_CACHE; 1935 1936 for (int i = 0; i < count; i++) { 1937 final View child = children[i]; 1938 if ((child.mViewFlags & VISIBILITY_MASK) == VISIBLE) { 1939 final LayoutParams params = child.getLayoutParams(); 1940 attachLayoutAnimationParameters(child, params, i, count); 1941 bindLayoutAnimation(child); 1942 if (cache) { 1943 child.setDrawingCacheEnabled(true); 1944 child.buildDrawingCache(true); 1945 } 1946 } 1947 } 1948 1949 final LayoutAnimationController controller = mLayoutAnimationController; 1950 if (controller.willOverlap()) { 1951 mGroupFlags |= FLAG_OPTIMIZE_INVALIDATE; 1952 } 1953 1954 controller.start(); 1955 1956 mGroupFlags &= ~FLAG_RUN_ANIMATION; 1957 mGroupFlags &= ~FLAG_ANIMATION_DONE; 1958 1959 if (cache) { 1960 mGroupFlags |= FLAG_CHILDREN_DRAWN_WITH_CACHE; 1961 } 1962 1963 if (mAnimationListener != null) { 1964 mAnimationListener.onAnimationStart(controller.getAnimation()); 1965 } 1966 } 1967 1968 int saveCount = 0; 1969 final boolean clipToPadding = (flags & CLIP_TO_PADDING_MASK) == CLIP_TO_PADDING_MASK; 1970 if (clipToPadding) { 1971 saveCount = canvas.save(); 1972 canvas.clipRect(mScrollX + mPaddingLeft, mScrollY + mPaddingTop, 1973 mScrollX + mRight - mLeft - mPaddingRight, 1974 mScrollY + mBottom - mTop - mPaddingBottom); 1975 1976 } 1977 1978 // We will draw our child's animation, let's reset the flag 1979 mPrivateFlags &= ~DRAW_ANIMATION; 1980 mGroupFlags &= ~FLAG_INVALIDATE_REQUIRED; 1981 1982 boolean more = false; 1983 final long drawingTime = getDrawingTime(); 1984 1985 if ((flags & FLAG_USE_CHILD_DRAWING_ORDER) == 0) { 1986 for (int i = 0; i < count; i++) { 1987 final View child = children[i]; 1988 if ((child.mViewFlags & VISIBILITY_MASK) == VISIBLE || child.getAnimation() != null) { 1989 more |= drawChild(canvas, child, drawingTime); 1990 } 1991 } 1992 } else { 1993 for (int i = 0; i < count; i++) { 1994 final View child = children[getChildDrawingOrder(count, i)]; 1995 if ((child.mViewFlags & VISIBILITY_MASK) == VISIBLE || child.getAnimation() != null) { 1996 more |= drawChild(canvas, child, drawingTime); 1997 } 1998 } 1999 } 2000 2001 // Draw any disappearing views that have animations 2002 if (mDisappearingChildren != null) { 2003 final ArrayList<View> disappearingChildren = mDisappearingChildren; 2004 final int disappearingCount = disappearingChildren.size() - 1; 2005 // Go backwards -- we may delete as animations finish 2006 for (int i = disappearingCount; i >= 0; i--) { 2007 final View child = disappearingChildren.get(i); 2008 more |= drawChild(canvas, child, drawingTime); 2009 } 2010 } 2011 2012 if (clipToPadding) { 2013 canvas.restoreToCount(saveCount); 2014 } 2015 2016 // mGroupFlags might have been updated by drawChild() 2017 flags = mGroupFlags; 2018 2019 if ((flags & FLAG_INVALIDATE_REQUIRED) == FLAG_INVALIDATE_REQUIRED) { 2020 invalidate(); 2021 } 2022 2023 if ((flags & FLAG_ANIMATION_DONE) == 0 && (flags & FLAG_NOTIFY_ANIMATION_LISTENER) == 0 && 2024 mLayoutAnimationController.isDone() && !more) { 2025 // We want to erase the drawing cache and notify the listener after the 2026 // next frame is drawn because one extra invalidate() is caused by 2027 // drawChild() after the animation is over 2028 mGroupFlags |= FLAG_NOTIFY_ANIMATION_LISTENER; 2029 final Runnable end = new Runnable() { 2030 public void run() { 2031 notifyAnimationListener(); 2032 } 2033 }; 2034 post(end); 2035 } 2036 } 2037 2038 /** 2039 * Returns the index of the child to draw for this iteration. Override this 2040 * if you want to change the drawing order of children. By default, it 2041 * returns i. 2042 * <p> 2043 * NOTE: In order for this method to be called, you must enable child ordering 2044 * first by calling {@link #setChildrenDrawingOrderEnabled(boolean)}. 2045 * 2046 * @param i The current iteration. 2047 * @return The index of the child to draw this iteration. 2048 * 2049 * @see #setChildrenDrawingOrderEnabled(boolean) 2050 * @see #isChildrenDrawingOrderEnabled() 2051 */ 2052 protected int getChildDrawingOrder(int childCount, int i) { 2053 return i; 2054 } 2055 2056 private void notifyAnimationListener() { 2057 mGroupFlags &= ~FLAG_NOTIFY_ANIMATION_LISTENER; 2058 mGroupFlags |= FLAG_ANIMATION_DONE; 2059 2060 if (mAnimationListener != null) { 2061 final Runnable end = new Runnable() { 2062 public void run() { 2063 mAnimationListener.onAnimationEnd(mLayoutAnimationController.getAnimation()); 2064 } 2065 }; 2066 post(end); 2067 } 2068 2069 if ((mGroupFlags & FLAG_ANIMATION_CACHE) == FLAG_ANIMATION_CACHE) { 2070 mGroupFlags &= ~FLAG_CHILDREN_DRAWN_WITH_CACHE; 2071 if ((mPersistentDrawingCache & PERSISTENT_ANIMATION_CACHE) == 0) { 2072 setChildrenDrawingCacheEnabled(false); 2073 } 2074 } 2075 2076 invalidate(); 2077 } 2078 2079 /** 2080 * Draw one child of this View Group. This method is responsible for getting 2081 * the canvas in the right state. This includes clipping, translating so 2082 * that the child's scrolled origin is at 0, 0, and applying any animation 2083 * transformations. 2084 * 2085 * @param canvas The canvas on which to draw the child 2086 * @param child Who to draw 2087 * @param drawingTime The time at which draw is occuring 2088 * @return True if an invalidate() was issued 2089 */ 2090 protected boolean drawChild(Canvas canvas, View child, long drawingTime) { 2091 boolean more = false; 2092 2093 final int cl = child.mLeft; 2094 final int ct = child.mTop; 2095 final int cr = child.mRight; 2096 final int cb = child.mBottom; 2097 2098 final int flags = mGroupFlags; 2099 2100 if ((flags & FLAG_CLEAR_TRANSFORMATION) == FLAG_CLEAR_TRANSFORMATION) { 2101 mChildTransformation.clear(); 2102 mGroupFlags &= ~FLAG_CLEAR_TRANSFORMATION; 2103 } 2104 2105 Transformation transformToApply = null; 2106 Transformation invalidationTransform; 2107 final Animation a = child.getAnimation(); 2108 boolean concatMatrix = false; 2109 2110 boolean scalingRequired = false; 2111 boolean caching = false; 2112 if ((flags & FLAG_CHILDREN_DRAWN_WITH_CACHE) == FLAG_CHILDREN_DRAWN_WITH_CACHE || 2113 (flags & FLAG_ALWAYS_DRAWN_WITH_CACHE) == FLAG_ALWAYS_DRAWN_WITH_CACHE) { 2114 caching = true; 2115 if (mAttachInfo != null) scalingRequired = mAttachInfo.mScalingRequired; 2116 } 2117 2118 if (a != null) { 2119 final boolean initialized = a.isInitialized(); 2120 if (!initialized) { 2121 a.initialize(cr - cl, cb - ct, getWidth(), getHeight()); 2122 a.initializeInvalidateRegion(0, 0, cr - cl, cb - ct); 2123 child.onAnimationStart(); 2124 } 2125 2126 more = a.getTransformation(drawingTime, mChildTransformation, 2127 scalingRequired ? mAttachInfo.mApplicationScale : 1f); 2128 if (scalingRequired && mAttachInfo.mApplicationScale != 1f) { 2129 if (mInvalidationTransformation == null) { 2130 mInvalidationTransformation = new Transformation(); 2131 } 2132 invalidationTransform = mInvalidationTransformation; 2133 a.getTransformation(drawingTime, invalidationTransform, 1f); 2134 } else { 2135 invalidationTransform = mChildTransformation; 2136 } 2137 transformToApply = mChildTransformation; 2138 2139 concatMatrix = a.willChangeTransformationMatrix(); 2140 2141 if (more) { 2142 if (!a.willChangeBounds()) { 2143 if ((flags & (FLAG_OPTIMIZE_INVALIDATE | FLAG_ANIMATION_DONE)) == 2144 FLAG_OPTIMIZE_INVALIDATE) { 2145 mGroupFlags |= FLAG_INVALIDATE_REQUIRED; 2146 } else if ((flags & FLAG_INVALIDATE_REQUIRED) == 0) { 2147 // The child need to draw an animation, potentially offscreen, so 2148 // make sure we do not cancel invalidate requests 2149 mPrivateFlags |= DRAW_ANIMATION; 2150 invalidate(cl, ct, cr, cb); 2151 } 2152 } else { 2153 if (mInvalidateRegion == null) { 2154 mInvalidateRegion = new RectF(); 2155 } 2156 final RectF region = mInvalidateRegion; 2157 a.getInvalidateRegion(0, 0, cr - cl, cb - ct, region, invalidationTransform); 2158 2159 // The child need to draw an animation, potentially offscreen, so 2160 // make sure we do not cancel invalidate requests 2161 mPrivateFlags |= DRAW_ANIMATION; 2162 2163 final int left = cl + (int) region.left; 2164 final int top = ct + (int) region.top; 2165 invalidate(left, top, left + (int) region.width(), top + (int) region.height()); 2166 } 2167 } 2168 } else if ((flags & FLAG_SUPPORT_STATIC_TRANSFORMATIONS) == 2169 FLAG_SUPPORT_STATIC_TRANSFORMATIONS) { 2170 final boolean hasTransform = getChildStaticTransformation(child, mChildTransformation); 2171 if (hasTransform) { 2172 final int transformType = mChildTransformation.getTransformationType(); 2173 transformToApply = transformType != Transformation.TYPE_IDENTITY ? 2174 mChildTransformation : null; 2175 concatMatrix = (transformType & Transformation.TYPE_MATRIX) != 0; 2176 } 2177 } 2178 2179 concatMatrix |= !child.hasIdentityMatrix(); 2180 2181 // Sets the flag as early as possible to allow draw() implementations 2182 // to call invalidate() successfully when doing animations 2183 child.mPrivateFlags |= DRAWN; 2184 2185 if (!concatMatrix && canvas.quickReject(cl, ct, cr, cb, Canvas.EdgeType.BW) && 2186 (child.mPrivateFlags & DRAW_ANIMATION) == 0) { 2187 return more; 2188 } 2189 2190 float alpha = child.getAlpha(); 2191 // Bail out early if the view does not need to be drawn 2192 if (alpha <= ViewConfiguration.ALPHA_THRESHOLD && (child.mPrivateFlags & ALPHA_SET) == 0 && 2193 !(child instanceof SurfaceView)) { 2194 return more; 2195 } 2196 2197 child.computeScroll(); 2198 2199 final int sx = child.mScrollX; 2200 final int sy = child.mScrollY; 2201 2202 DisplayList displayList = null; 2203 Bitmap cache = null; 2204 if (caching) { 2205 if (!canvas.isHardwareAccelerated()) { 2206 cache = child.getDrawingCache(true); 2207 } else { 2208 // TODO: bring back 2209 // displayList = child.getDisplayList(); 2210 } 2211 } 2212 2213 final boolean hasDisplayList = displayList != null && displayList.isReady(); 2214 final boolean hasNoCache = cache == null || hasDisplayList; 2215 2216 final int restoreTo = canvas.save(); 2217 if (hasNoCache) { 2218 canvas.translate(cl - sx, ct - sy); 2219 } else { 2220 canvas.translate(cl, ct); 2221 if (scalingRequired) { 2222 // mAttachInfo cannot be null, otherwise scalingRequired == false 2223 final float scale = 1.0f / mAttachInfo.mApplicationScale; 2224 canvas.scale(scale, scale); 2225 } 2226 } 2227 2228 if (transformToApply != null || alpha < 1.0f || !child.hasIdentityMatrix()) { 2229 int transX = 0; 2230 int transY = 0; 2231 2232 if (hasNoCache) { 2233 transX = -sx; 2234 transY = -sy; 2235 } 2236 2237 if (transformToApply != null) { 2238 if (concatMatrix) { 2239 // Undo the scroll translation, apply the transformation matrix, 2240 // then redo the scroll translate to get the correct result. 2241 canvas.translate(-transX, -transY); 2242 canvas.concat(transformToApply.getMatrix()); 2243 canvas.translate(transX, transY); 2244 mGroupFlags |= FLAG_CLEAR_TRANSFORMATION; 2245 } 2246 2247 float transformAlpha = transformToApply.getAlpha(); 2248 if (transformAlpha < 1.0f) { 2249 alpha *= transformToApply.getAlpha(); 2250 mGroupFlags |= FLAG_CLEAR_TRANSFORMATION; 2251 } 2252 } 2253 2254 if (!child.hasIdentityMatrix()) { 2255 canvas.translate(-transX, -transY); 2256 canvas.concat(child.getMatrix()); 2257 canvas.translate(transX, transY); 2258 } 2259 2260 if (alpha < 1.0f) { 2261 mGroupFlags |= FLAG_CLEAR_TRANSFORMATION; 2262 2263 if (hasNoCache) { 2264 final int multipliedAlpha = (int) (255 * alpha); 2265 if (!child.onSetAlpha(multipliedAlpha)) { 2266 int layerFlags = Canvas.HAS_ALPHA_LAYER_SAVE_FLAG; 2267 if ((flags & FLAG_CLIP_CHILDREN) == FLAG_CLIP_CHILDREN) { 2268 layerFlags |= Canvas.CLIP_TO_LAYER_SAVE_FLAG; 2269 } 2270 canvas.saveLayerAlpha(sx, sy, sx + cr - cl, sy + cb - ct, multipliedAlpha, 2271 layerFlags); 2272 } else { 2273 child.mPrivateFlags |= ALPHA_SET; 2274 } 2275 } 2276 } 2277 } else if ((child.mPrivateFlags & ALPHA_SET) == ALPHA_SET) { 2278 child.onSetAlpha(255); 2279 child.mPrivateFlags &= ~ALPHA_SET; 2280 } 2281 2282 if ((flags & FLAG_CLIP_CHILDREN) == FLAG_CLIP_CHILDREN) { 2283 if (hasNoCache) { 2284 canvas.clipRect(sx, sy, sx + (cr - cl), sy + (cb - ct)); 2285 } else { 2286 if (!scalingRequired) { 2287 canvas.clipRect(0, 0, cr - cl, cb - ct); 2288 } else { 2289 canvas.clipRect(0, 0, cache.getWidth(), cache.getHeight()); 2290 } 2291 } 2292 } 2293 2294 if (hasNoCache) { 2295 if (!hasDisplayList) { 2296 // Fast path for layouts with no backgrounds 2297 if ((child.mPrivateFlags & SKIP_DRAW) == SKIP_DRAW) { 2298 if (ViewDebug.TRACE_HIERARCHY) { 2299 ViewDebug.trace(this, ViewDebug.HierarchyTraceType.DRAW); 2300 } 2301 child.mPrivateFlags &= ~DIRTY_MASK; 2302 child.dispatchDraw(canvas); 2303 } else { 2304 child.draw(canvas); 2305 } 2306 } else { 2307 ((HardwareCanvas) canvas).drawDisplayList(displayList); 2308 } 2309 } else if (cache != null) { 2310 final Paint cachePaint = mCachePaint; 2311 if (alpha < 1.0f) { 2312 cachePaint.setAlpha((int) (alpha * 255)); 2313 mGroupFlags |= FLAG_ALPHA_LOWER_THAN_ONE; 2314 } else if ((flags & FLAG_ALPHA_LOWER_THAN_ONE) == FLAG_ALPHA_LOWER_THAN_ONE) { 2315 cachePaint.setAlpha(255); 2316 mGroupFlags &= ~FLAG_ALPHA_LOWER_THAN_ONE; 2317 } 2318 canvas.drawBitmap(cache, 0.0f, 0.0f, cachePaint); 2319 } 2320 2321 canvas.restoreToCount(restoreTo); 2322 2323 if (a != null && !more) { 2324 child.onSetAlpha(255); 2325 finishAnimatingView(child, a); 2326 } 2327 2328 return more; 2329 } 2330 2331 /** 2332 * By default, children are clipped to their bounds before drawing. This 2333 * allows view groups to override this behavior for animations, etc. 2334 * 2335 * @param clipChildren true to clip children to their bounds, 2336 * false otherwise 2337 * @attr ref android.R.styleable#ViewGroup_clipChildren 2338 */ 2339 public void setClipChildren(boolean clipChildren) { 2340 setBooleanFlag(FLAG_CLIP_CHILDREN, clipChildren); 2341 } 2342 2343 /** 2344 * By default, children are clipped to the padding of the ViewGroup. This 2345 * allows view groups to override this behavior 2346 * 2347 * @param clipToPadding true to clip children to the padding of the 2348 * group, false otherwise 2349 * @attr ref android.R.styleable#ViewGroup_clipToPadding 2350 */ 2351 public void setClipToPadding(boolean clipToPadding) { 2352 setBooleanFlag(FLAG_CLIP_TO_PADDING, clipToPadding); 2353 } 2354 2355 /** 2356 * {@inheritDoc} 2357 */ 2358 @Override 2359 public void dispatchSetSelected(boolean selected) { 2360 final View[] children = mChildren; 2361 final int count = mChildrenCount; 2362 for (int i = 0; i < count; i++) { 2363 2364 children[i].setSelected(selected); 2365 } 2366 } 2367 2368 /** 2369 * {@inheritDoc} 2370 */ 2371 @Override 2372 public void dispatchSetActivated(boolean activated) { 2373 final View[] children = mChildren; 2374 final int count = mChildrenCount; 2375 for (int i = 0; i < count; i++) { 2376 2377 children[i].setActivated(activated); 2378 } 2379 } 2380 2381 @Override 2382 protected void dispatchSetPressed(boolean pressed) { 2383 final View[] children = mChildren; 2384 final int count = mChildrenCount; 2385 for (int i = 0; i < count; i++) { 2386 children[i].setPressed(pressed); 2387 } 2388 } 2389 2390 /** 2391 * When this property is set to true, this ViewGroup supports static transformations on 2392 * children; this causes 2393 * {@link #getChildStaticTransformation(View, android.view.animation.Transformation)} to be 2394 * invoked when a child is drawn. 2395 * 2396 * Any subclass overriding 2397 * {@link #getChildStaticTransformation(View, android.view.animation.Transformation)} should 2398 * set this property to true. 2399 * 2400 * @param enabled True to enable static transformations on children, false otherwise. 2401 * 2402 * @see #FLAG_SUPPORT_STATIC_TRANSFORMATIONS 2403 */ 2404 protected void setStaticTransformationsEnabled(boolean enabled) { 2405 setBooleanFlag(FLAG_SUPPORT_STATIC_TRANSFORMATIONS, enabled); 2406 } 2407 2408 /** 2409 * {@inheritDoc} 2410 * 2411 * @see #setStaticTransformationsEnabled(boolean) 2412 */ 2413 protected boolean getChildStaticTransformation(View child, Transformation t) { 2414 return false; 2415 } 2416 2417 /** 2418 * {@hide} 2419 */ 2420 @Override 2421 protected View findViewTraversal(int id) { 2422 if (id == mID) { 2423 return this; 2424 } 2425 2426 final View[] where = mChildren; 2427 final int len = mChildrenCount; 2428 2429 for (int i = 0; i < len; i++) { 2430 View v = where[i]; 2431 2432 if ((v.mPrivateFlags & IS_ROOT_NAMESPACE) == 0) { 2433 v = v.findViewById(id); 2434 2435 if (v != null) { 2436 return v; 2437 } 2438 } 2439 } 2440 2441 return null; 2442 } 2443 2444 /** 2445 * {@hide} 2446 */ 2447 @Override 2448 protected View findViewWithTagTraversal(Object tag) { 2449 if (tag != null && tag.equals(mTag)) { 2450 return this; 2451 } 2452 2453 final View[] where = mChildren; 2454 final int len = mChildrenCount; 2455 2456 for (int i = 0; i < len; i++) { 2457 View v = where[i]; 2458 2459 if ((v.mPrivateFlags & IS_ROOT_NAMESPACE) == 0) { 2460 v = v.findViewWithTag(tag); 2461 2462 if (v != null) { 2463 return v; 2464 } 2465 } 2466 } 2467 2468 return null; 2469 } 2470 2471 /** 2472 * Adds a child view. If no layout parameters are already set on the child, the 2473 * default parameters for this ViewGroup are set on the child. 2474 * 2475 * @param child the child view to add 2476 * 2477 * @see #generateDefaultLayoutParams() 2478 */ 2479 public void addView(View child) { 2480 addView(child, -1); 2481 } 2482 2483 /** 2484 * Adds a child view. If no layout parameters are already set on the child, the 2485 * default parameters for this ViewGroup are set on the child. 2486 * 2487 * @param child the child view to add 2488 * @param index the position at which to add the child 2489 * 2490 * @see #generateDefaultLayoutParams() 2491 */ 2492 public void addView(View child, int index) { 2493 LayoutParams params = child.getLayoutParams(); 2494 if (params == null) { 2495 params = generateDefaultLayoutParams(); 2496 if (params == null) { 2497 throw new IllegalArgumentException("generateDefaultLayoutParams() cannot return null"); 2498 } 2499 } 2500 addView(child, index, params); 2501 } 2502 2503 /** 2504 * Adds a child view with this ViewGroup's default layout parameters and the 2505 * specified width and height. 2506 * 2507 * @param child the child view to add 2508 */ 2509 public void addView(View child, int width, int height) { 2510 final LayoutParams params = generateDefaultLayoutParams(); 2511 params.width = width; 2512 params.height = height; 2513 addView(child, -1, params); 2514 } 2515 2516 /** 2517 * Adds a child view with the specified layout parameters. 2518 * 2519 * @param child the child view to add 2520 * @param params the layout parameters to set on the child 2521 */ 2522 public void addView(View child, LayoutParams params) { 2523 addView(child, -1, params); 2524 } 2525 2526 /** 2527 * Adds a child view with the specified layout parameters. 2528 * 2529 * @param child the child view to add 2530 * @param index the position at which to add the child 2531 * @param params the layout parameters to set on the child 2532 */ 2533 public void addView(View child, int index, LayoutParams params) { 2534 if (DBG) { 2535 System.out.println(this + " addView"); 2536 } 2537 2538 // addViewInner() will call child.requestLayout() when setting the new LayoutParams 2539 // therefore, we call requestLayout() on ourselves before, so that the child's request 2540 // will be blocked at our level 2541 requestLayout(); 2542 invalidate(); 2543 addViewInner(child, index, params, false); 2544 } 2545 2546 /** 2547 * {@inheritDoc} 2548 */ 2549 public void updateViewLayout(View view, ViewGroup.LayoutParams params) { 2550 if (!checkLayoutParams(params)) { 2551 throw new IllegalArgumentException("Invalid LayoutParams supplied to " + this); 2552 } 2553 if (view.mParent != this) { 2554 throw new IllegalArgumentException("Given view not a child of " + this); 2555 } 2556 view.setLayoutParams(params); 2557 } 2558 2559 /** 2560 * {@inheritDoc} 2561 */ 2562 protected boolean checkLayoutParams(ViewGroup.LayoutParams p) { 2563 return p != null; 2564 } 2565 2566 /** 2567 * Interface definition for a callback to be invoked when the hierarchy 2568 * within this view changed. The hierarchy changes whenever a child is added 2569 * to or removed from this view. 2570 */ 2571 public interface OnHierarchyChangeListener { 2572 /** 2573 * Called when a new child is added to a parent view. 2574 * 2575 * @param parent the view in which a child was added 2576 * @param child the new child view added in the hierarchy 2577 */ 2578 void onChildViewAdded(View parent, View child); 2579 2580 /** 2581 * Called when a child is removed from a parent view. 2582 * 2583 * @param parent the view from which the child was removed 2584 * @param child the child removed from the hierarchy 2585 */ 2586 void onChildViewRemoved(View parent, View child); 2587 } 2588 2589 /** 2590 * Register a callback to be invoked when a child is added to or removed 2591 * from this view. 2592 * 2593 * @param listener the callback to invoke on hierarchy change 2594 */ 2595 public void setOnHierarchyChangeListener(OnHierarchyChangeListener listener) { 2596 mOnHierarchyChangeListener = listener; 2597 } 2598 2599 /** 2600 * Adds a view during layout. This is useful if in your onLayout() method, 2601 * you need to add more views (as does the list view for example). 2602 * 2603 * If index is negative, it means put it at the end of the list. 2604 * 2605 * @param child the view to add to the group 2606 * @param index the index at which the child must be added 2607 * @param params the layout parameters to associate with the child 2608 * @return true if the child was added, false otherwise 2609 */ 2610 protected boolean addViewInLayout(View child, int index, LayoutParams params) { 2611 return addViewInLayout(child, index, params, false); 2612 } 2613 2614 /** 2615 * Adds a view during layout. This is useful if in your onLayout() method, 2616 * you need to add more views (as does the list view for example). 2617 * 2618 * If index is negative, it means put it at the end of the list. 2619 * 2620 * @param child the view to add to the group 2621 * @param index the index at which the child must be added 2622 * @param params the layout parameters to associate with the child 2623 * @param preventRequestLayout if true, calling this method will not trigger a 2624 * layout request on child 2625 * @return true if the child was added, false otherwise 2626 */ 2627 protected boolean addViewInLayout(View child, int index, LayoutParams params, 2628 boolean preventRequestLayout) { 2629 child.mParent = null; 2630 addViewInner(child, index, params, preventRequestLayout); 2631 child.mPrivateFlags = (child.mPrivateFlags & ~DIRTY_MASK) | DRAWN; 2632 return true; 2633 } 2634 2635 /** 2636 * Prevents the specified child to be laid out during the next layout pass. 2637 * 2638 * @param child the child on which to perform the cleanup 2639 */ 2640 protected void cleanupLayoutState(View child) { 2641 child.mPrivateFlags &= ~View.FORCE_LAYOUT; 2642 } 2643 2644 private void addViewInner(View child, int index, LayoutParams params, 2645 boolean preventRequestLayout) { 2646 2647 if (child.getParent() != null) { 2648 throw new IllegalStateException("The specified child already has a parent. " + 2649 "You must call removeView() on the child's parent first."); 2650 } 2651 2652 if (mTransition != null) { 2653 mTransition.addChild(this, child); 2654 } 2655 2656 if (!checkLayoutParams(params)) { 2657 params = generateLayoutParams(params); 2658 } 2659 2660 if (preventRequestLayout) { 2661 child.mLayoutParams = params; 2662 } else { 2663 child.setLayoutParams(params); 2664 } 2665 2666 if (index < 0) { 2667 index = mChildrenCount; 2668 } 2669 2670 addInArray(child, index); 2671 2672 // tell our children 2673 if (preventRequestLayout) { 2674 child.assignParent(this); 2675 } else { 2676 child.mParent = this; 2677 } 2678 2679 if (child.hasFocus()) { 2680 requestChildFocus(child, child.findFocus()); 2681 } 2682 2683 AttachInfo ai = mAttachInfo; 2684 if (ai != null) { 2685 boolean lastKeepOn = ai.mKeepScreenOn; 2686 ai.mKeepScreenOn = false; 2687 child.dispatchAttachedToWindow(mAttachInfo, (mViewFlags&VISIBILITY_MASK)); 2688 if (ai.mKeepScreenOn) { 2689 needGlobalAttributesUpdate(true); 2690 } 2691 ai.mKeepScreenOn = lastKeepOn; 2692 } 2693 2694 if (mOnHierarchyChangeListener != null) { 2695 mOnHierarchyChangeListener.onChildViewAdded(this, child); 2696 } 2697 2698 if ((child.mViewFlags & DUPLICATE_PARENT_STATE) == DUPLICATE_PARENT_STATE) { 2699 mGroupFlags |= FLAG_NOTIFY_CHILDREN_ON_DRAWABLE_STATE_CHANGE; 2700 } 2701 } 2702 2703 private void addInArray(View child, int index) { 2704 View[] children = mChildren; 2705 final int count = mChildrenCount; 2706 final int size = children.length; 2707 if (index == count) { 2708 if (size == count) { 2709 mChildren = new View[size + ARRAY_CAPACITY_INCREMENT]; 2710 System.arraycopy(children, 0, mChildren, 0, size); 2711 children = mChildren; 2712 } 2713 children[mChildrenCount++] = child; 2714 } else if (index < count) { 2715 if (size == count) { 2716 mChildren = new View[size + ARRAY_CAPACITY_INCREMENT]; 2717 System.arraycopy(children, 0, mChildren, 0, index); 2718 System.arraycopy(children, index, mChildren, index + 1, count - index); 2719 children = mChildren; 2720 } else { 2721 System.arraycopy(children, index, children, index + 1, count - index); 2722 } 2723 children[index] = child; 2724 mChildrenCount++; 2725 } else { 2726 throw new IndexOutOfBoundsException("index=" + index + " count=" + count); 2727 } 2728 } 2729 2730 // This method also sets the child's mParent to null 2731 private void removeFromArray(int index) { 2732 final View[] children = mChildren; 2733 if (!(mTransitioningViews != null && mTransitioningViews.contains(children[index]))) { 2734 children[index].mParent = null; 2735 } 2736 final int count = mChildrenCount; 2737 if (index == count - 1) { 2738 children[--mChildrenCount] = null; 2739 } else if (index >= 0 && index < count) { 2740 System.arraycopy(children, index + 1, children, index, count - index - 1); 2741 children[--mChildrenCount] = null; 2742 } else { 2743 throw new IndexOutOfBoundsException(); 2744 } 2745 } 2746 2747 // This method also sets the children's mParent to null 2748 private void removeFromArray(int start, int count) { 2749 final View[] children = mChildren; 2750 final int childrenCount = mChildrenCount; 2751 2752 start = Math.max(0, start); 2753 final int end = Math.min(childrenCount, start + count); 2754 2755 if (start == end) { 2756 return; 2757 } 2758 2759 if (end == childrenCount) { 2760 for (int i = start; i < end; i++) { 2761 children[i].mParent = null; 2762 children[i] = null; 2763 } 2764 } else { 2765 for (int i = start; i < end; i++) { 2766 children[i].mParent = null; 2767 } 2768 2769 // Since we're looping above, we might as well do the copy, but is arraycopy() 2770 // faster than the extra 2 bounds checks we would do in the loop? 2771 System.arraycopy(children, end, children, start, childrenCount - end); 2772 2773 for (int i = childrenCount - (end - start); i < childrenCount; i++) { 2774 children[i] = null; 2775 } 2776 } 2777 2778 mChildrenCount -= (end - start); 2779 } 2780 2781 private void bindLayoutAnimation(View child) { 2782 Animation a = mLayoutAnimationController.getAnimationForView(child); 2783 child.setAnimation(a); 2784 } 2785 2786 /** 2787 * Subclasses should override this method to set layout animation 2788 * parameters on the supplied child. 2789 * 2790 * @param child the child to associate with animation parameters 2791 * @param params the child's layout parameters which hold the animation 2792 * parameters 2793 * @param index the index of the child in the view group 2794 * @param count the number of children in the view group 2795 */ 2796 protected void attachLayoutAnimationParameters(View child, 2797 LayoutParams params, int index, int count) { 2798 LayoutAnimationController.AnimationParameters animationParams = 2799 params.layoutAnimationParameters; 2800 if (animationParams == null) { 2801 animationParams = new LayoutAnimationController.AnimationParameters(); 2802 params.layoutAnimationParameters = animationParams; 2803 } 2804 2805 animationParams.count = count; 2806 animationParams.index = index; 2807 } 2808 2809 /** 2810 * {@inheritDoc} 2811 */ 2812 public void removeView(View view) { 2813 removeViewInternal(view); 2814 requestLayout(); 2815 invalidate(); 2816 } 2817 2818 /** 2819 * Removes a view during layout. This is useful if in your onLayout() method, 2820 * you need to remove more views. 2821 * 2822 * @param view the view to remove from the group 2823 */ 2824 public void removeViewInLayout(View view) { 2825 removeViewInternal(view); 2826 } 2827 2828 /** 2829 * Removes a range of views during layout. This is useful if in your onLayout() method, 2830 * you need to remove more views. 2831 * 2832 * @param start the index of the first view to remove from the group 2833 * @param count the number of views to remove from the group 2834 */ 2835 public void removeViewsInLayout(int start, int count) { 2836 removeViewsInternal(start, count); 2837 } 2838 2839 /** 2840 * Removes the view at the specified position in the group. 2841 * 2842 * @param index the position in the group of the view to remove 2843 */ 2844 public void removeViewAt(int index) { 2845 removeViewInternal(index, getChildAt(index)); 2846 requestLayout(); 2847 invalidate(); 2848 } 2849 2850 /** 2851 * Removes the specified range of views from the group. 2852 * 2853 * @param start the first position in the group of the range of views to remove 2854 * @param count the number of views to remove 2855 */ 2856 public void removeViews(int start, int count) { 2857 removeViewsInternal(start, count); 2858 requestLayout(); 2859 invalidate(); 2860 } 2861 2862 private void removeViewInternal(View view) { 2863 final int index = indexOfChild(view); 2864 if (index >= 0) { 2865 removeViewInternal(index, view); 2866 } 2867 } 2868 2869 private void removeViewInternal(int index, View view) { 2870 2871 if (mTransition != null) { 2872 mTransition.removeChild(this, view); 2873 } 2874 2875 boolean clearChildFocus = false; 2876 if (view == mFocused) { 2877 view.clearFocusForRemoval(); 2878 clearChildFocus = true; 2879 } 2880 2881 if (view.getAnimation() != null || 2882 (mTransitioningViews != null && mTransitioningViews.contains(view))) { 2883 addDisappearingView(view); 2884 } else if (view.mAttachInfo != null) { 2885 view.dispatchDetachedFromWindow(); 2886 } 2887 2888 if (mOnHierarchyChangeListener != null) { 2889 mOnHierarchyChangeListener.onChildViewRemoved(this, view); 2890 } 2891 2892 needGlobalAttributesUpdate(false); 2893 2894 removeFromArray(index); 2895 2896 if (clearChildFocus) { 2897 clearChildFocus(view); 2898 } 2899 } 2900 2901 /** 2902 * Sets the LayoutTransition object for this ViewGroup. If the LayoutTransition object is 2903 * not null, changes in layout which occur because of children being added to or removed from 2904 * the ViewGroup will be animated according to the animations defined in that LayoutTransition 2905 * object. By default, the transition object is null (so layout changes are not animated). 2906 * 2907 * @param transition The LayoutTransition object that will animated changes in layout. A value 2908 * of <code>null</code> means no transition will run on layout changes. 2909 * @attr ref android.R.styleable#ViewGroup_animateLayoutChanges 2910 */ 2911 public void setLayoutTransition(LayoutTransition transition) { 2912 if (mTransition != null) { 2913 mTransition.removeTransitionListener(mLayoutTransitionListener); 2914 } 2915 mTransition = transition; 2916 if (mTransition != null) { 2917 mTransition.addTransitionListener(mLayoutTransitionListener); 2918 } 2919 } 2920 2921 /** 2922 * Gets the LayoutTransition object for this ViewGroup. If the LayoutTransition object is 2923 * not null, changes in layout which occur because of children being added to or removed from 2924 * the ViewGroup will be animated according to the animations defined in that LayoutTransition 2925 * object. By default, the transition object is null (so layout changes are not animated). 2926 * 2927 * @return LayoutTranstion The LayoutTransition object that will animated changes in layout. 2928 * A value of <code>null</code> means no transition will run on layout changes. 2929 */ 2930 public LayoutTransition getLayoutTransition() { 2931 return mTransition; 2932 } 2933 2934 private void removeViewsInternal(int start, int count) { 2935 final OnHierarchyChangeListener onHierarchyChangeListener = mOnHierarchyChangeListener; 2936 final boolean notifyListener = onHierarchyChangeListener != null; 2937 final View focused = mFocused; 2938 final boolean detach = mAttachInfo != null; 2939 View clearChildFocus = null; 2940 2941 final View[] children = mChildren; 2942 final int end = start + count; 2943 2944 for (int i = start; i < end; i++) { 2945 final View view = children[i]; 2946 2947 if (mTransition != null) { 2948 mTransition.removeChild(this, view); 2949 } 2950 2951 if (view == focused) { 2952 view.clearFocusForRemoval(); 2953 clearChildFocus = view; 2954 } 2955 2956 if (view.getAnimation() != null || 2957 (mTransitioningViews != null && mTransitioningViews.contains(view))) { 2958 addDisappearingView(view); 2959 } else if (detach) { 2960 view.dispatchDetachedFromWindow(); 2961 } 2962 2963 needGlobalAttributesUpdate(false); 2964 2965 if (notifyListener) { 2966 onHierarchyChangeListener.onChildViewRemoved(this, view); 2967 } 2968 } 2969 2970 removeFromArray(start, count); 2971 2972 if (clearChildFocus != null) { 2973 clearChildFocus(clearChildFocus); 2974 } 2975 } 2976 2977 /** 2978 * Call this method to remove all child views from the 2979 * ViewGroup. 2980 */ 2981 public void removeAllViews() { 2982 removeAllViewsInLayout(); 2983 requestLayout(); 2984 invalidate(); 2985 } 2986 2987 /** 2988 * Called by a ViewGroup subclass to remove child views from itself, 2989 * when it must first know its size on screen before it can calculate how many 2990 * child views it will render. An example is a Gallery or a ListView, which 2991 * may "have" 50 children, but actually only render the number of children 2992 * that can currently fit inside the object on screen. Do not call 2993 * this method unless you are extending ViewGroup and understand the 2994 * view measuring and layout pipeline. 2995 */ 2996 public void removeAllViewsInLayout() { 2997 final int count = mChildrenCount; 2998 if (count <= 0) { 2999 return; 3000 } 3001 3002 final View[] children = mChildren; 3003 mChildrenCount = 0; 3004 3005 final OnHierarchyChangeListener listener = mOnHierarchyChangeListener; 3006 final boolean notify = listener != null; 3007 final View focused = mFocused; 3008 final boolean detach = mAttachInfo != null; 3009 View clearChildFocus = null; 3010 3011 needGlobalAttributesUpdate(false); 3012 3013 for (int i = count - 1; i >= 0; i--) { 3014 final View view = children[i]; 3015 3016 if (mTransition != null) { 3017 mTransition.removeChild(this, view); 3018 } 3019 3020 if (view == focused) { 3021 view.clearFocusForRemoval(); 3022 clearChildFocus = view; 3023 } 3024 3025 if (view.getAnimation() != null || 3026 (mTransitioningViews != null && mTransitioningViews.contains(view))) { 3027 addDisappearingView(view); 3028 } else if (detach) { 3029 view.dispatchDetachedFromWindow(); 3030 } 3031 3032 if (notify) { 3033 listener.onChildViewRemoved(this, view); 3034 } 3035 3036 view.mParent = null; 3037 children[i] = null; 3038 } 3039 3040 if (clearChildFocus != null) { 3041 clearChildFocus(clearChildFocus); 3042 } 3043 } 3044 3045 /** 3046 * Finishes the removal of a detached view. This method will dispatch the detached from 3047 * window event and notify the hierarchy change listener. 3048 * 3049 * @param child the child to be definitely removed from the view hierarchy 3050 * @param animate if true and the view has an animation, the view is placed in the 3051 * disappearing views list, otherwise, it is detached from the window 3052 * 3053 * @see #attachViewToParent(View, int, android.view.ViewGroup.LayoutParams) 3054 * @see #detachAllViewsFromParent() 3055 * @see #detachViewFromParent(View) 3056 * @see #detachViewFromParent(int) 3057 */ 3058 protected void removeDetachedView(View child, boolean animate) { 3059 if (mTransition != null) { 3060 mTransition.removeChild(this, child); 3061 } 3062 3063 if (child == mFocused) { 3064 child.clearFocus(); 3065 } 3066 3067 if ((animate && child.getAnimation() != null) || 3068 (mTransitioningViews != null && mTransitioningViews.contains(child))) { 3069 addDisappearingView(child); 3070 } else if (child.mAttachInfo != null) { 3071 child.dispatchDetachedFromWindow(); 3072 } 3073 3074 if (mOnHierarchyChangeListener != null) { 3075 mOnHierarchyChangeListener.onChildViewRemoved(this, child); 3076 } 3077 } 3078 3079 /** 3080 * Attaches a view to this view group. Attaching a view assigns this group as the parent, 3081 * sets the layout parameters and puts the view in the list of children so it can be retrieved 3082 * by calling {@link #getChildAt(int)}. 3083 * 3084 * This method should be called only for view which were detached from their parent. 3085 * 3086 * @param child the child to attach 3087 * @param index the index at which the child should be attached 3088 * @param params the layout parameters of the child 3089 * 3090 * @see #removeDetachedView(View, boolean) 3091 * @see #detachAllViewsFromParent() 3092 * @see #detachViewFromParent(View) 3093 * @see #detachViewFromParent(int) 3094 */ 3095 protected void attachViewToParent(View child, int index, LayoutParams params) { 3096 child.mLayoutParams = params; 3097 3098 if (index < 0) { 3099 index = mChildrenCount; 3100 } 3101 3102 addInArray(child, index); 3103 3104 child.mParent = this; 3105 child.mPrivateFlags = (child.mPrivateFlags & ~DIRTY_MASK & ~DRAWING_CACHE_VALID) | DRAWN; 3106 3107 if (child.hasFocus()) { 3108 requestChildFocus(child, child.findFocus()); 3109 } 3110 } 3111 3112 /** 3113 * Detaches a view from its parent. Detaching a view should be temporary and followed 3114 * either by a call to {@link #attachViewToParent(View, int, android.view.ViewGroup.LayoutParams)} 3115 * or a call to {@link #removeDetachedView(View, boolean)}. When a view is detached, 3116 * its parent is null and cannot be retrieved by a call to {@link #getChildAt(int)}. 3117 * 3118 * @param child the child to detach 3119 * 3120 * @see #detachViewFromParent(int) 3121 * @see #detachViewsFromParent(int, int) 3122 * @see #detachAllViewsFromParent() 3123 * @see #attachViewToParent(View, int, android.view.ViewGroup.LayoutParams) 3124 * @see #removeDetachedView(View, boolean) 3125 */ 3126 protected void detachViewFromParent(View child) { 3127 removeFromArray(indexOfChild(child)); 3128 } 3129 3130 /** 3131 * Detaches a view from its parent. Detaching a view should be temporary and followed 3132 * either by a call to {@link #attachViewToParent(View, int, android.view.ViewGroup.LayoutParams)} 3133 * or a call to {@link #removeDetachedView(View, boolean)}. When a view is detached, 3134 * its parent is null and cannot be retrieved by a call to {@link #getChildAt(int)}. 3135 * 3136 * @param index the index of the child to detach 3137 * 3138 * @see #detachViewFromParent(View) 3139 * @see #detachAllViewsFromParent() 3140 * @see #detachViewsFromParent(int, int) 3141 * @see #attachViewToParent(View, int, android.view.ViewGroup.LayoutParams) 3142 * @see #removeDetachedView(View, boolean) 3143 */ 3144 protected void detachViewFromParent(int index) { 3145 removeFromArray(index); 3146 } 3147 3148 /** 3149 * Detaches a range of view from their parent. Detaching a view should be temporary and followed 3150 * either by a call to {@link #attachViewToParent(View, int, android.view.ViewGroup.LayoutParams)} 3151 * or a call to {@link #removeDetachedView(View, boolean)}. When a view is detached, its 3152 * parent is null and cannot be retrieved by a call to {@link #getChildAt(int)}. 3153 * 3154 * @param start the first index of the childrend range to detach 3155 * @param count the number of children to detach 3156 * 3157 * @see #detachViewFromParent(View) 3158 * @see #detachViewFromParent(int) 3159 * @see #detachAllViewsFromParent() 3160 * @see #attachViewToParent(View, int, android.view.ViewGroup.LayoutParams) 3161 * @see #removeDetachedView(View, boolean) 3162 */ 3163 protected void detachViewsFromParent(int start, int count) { 3164 removeFromArray(start, count); 3165 } 3166 3167 /** 3168 * Detaches all views from the parent. Detaching a view should be temporary and followed 3169 * either by a call to {@link #attachViewToParent(View, int, android.view.ViewGroup.LayoutParams)} 3170 * or a call to {@link #removeDetachedView(View, boolean)}. When a view is detached, 3171 * its parent is null and cannot be retrieved by a call to {@link #getChildAt(int)}. 3172 * 3173 * @see #detachViewFromParent(View) 3174 * @see #detachViewFromParent(int) 3175 * @see #detachViewsFromParent(int, int) 3176 * @see #attachViewToParent(View, int, android.view.ViewGroup.LayoutParams) 3177 * @see #removeDetachedView(View, boolean) 3178 */ 3179 protected void detachAllViewsFromParent() { 3180 final int count = mChildrenCount; 3181 if (count <= 0) { 3182 return; 3183 } 3184 3185 final View[] children = mChildren; 3186 mChildrenCount = 0; 3187 3188 for (int i = count - 1; i >= 0; i--) { 3189 children[i].mParent = null; 3190 children[i] = null; 3191 } 3192 } 3193 3194 /** 3195 * Don't call or override this method. It is used for the implementation of 3196 * the view hierarchy. 3197 */ 3198 public final void invalidateChild(View child, final Rect dirty) { 3199 if (ViewDebug.TRACE_HIERARCHY) { 3200 ViewDebug.trace(this, ViewDebug.HierarchyTraceType.INVALIDATE_CHILD); 3201 } 3202 3203 ViewParent parent = this; 3204 3205 final AttachInfo attachInfo = mAttachInfo; 3206 if (attachInfo != null) { 3207 final int[] location = attachInfo.mInvalidateChildLocation; 3208 location[CHILD_LEFT_INDEX] = child.mLeft; 3209 location[CHILD_TOP_INDEX] = child.mTop; 3210 Matrix childMatrix = child.getMatrix(); 3211 if (!childMatrix.isIdentity()) { 3212 RectF boundingRect = attachInfo.mTmpTransformRect; 3213 boundingRect.set(dirty); 3214 childMatrix.mapRect(boundingRect); 3215 dirty.set((int) boundingRect.left, (int) boundingRect.top, 3216 (int) (boundingRect.right + 0.5f), 3217 (int) (boundingRect.bottom + 0.5f)); 3218 } 3219 3220 // If the child is drawing an animation, we want to copy this flag onto 3221 // ourselves and the parent to make sure the invalidate request goes 3222 // through 3223 final boolean drawAnimation = (child.mPrivateFlags & DRAW_ANIMATION) == DRAW_ANIMATION; 3224 3225 // Check whether the child that requests the invalidate is fully opaque 3226 final boolean isOpaque = child.isOpaque() && !drawAnimation && 3227 child.getAnimation() != null; 3228 // Mark the child as dirty, using the appropriate flag 3229 // Make sure we do not set both flags at the same time 3230 final int opaqueFlag = isOpaque ? DIRTY_OPAQUE : DIRTY; 3231 3232 do { 3233 View view = null; 3234 if (parent instanceof View) { 3235 view = (View) parent; 3236 } 3237 3238 if (drawAnimation) { 3239 if (view != null) { 3240 view.mPrivateFlags |= DRAW_ANIMATION; 3241 } else if (parent instanceof ViewRoot) { 3242 ((ViewRoot) parent).mIsAnimating = true; 3243 } 3244 } 3245 3246 // If the parent is dirty opaque or not dirty, mark it dirty with the opaque 3247 // flag coming from the child that initiated the invalidate 3248 if (view != null && (view.mPrivateFlags & DIRTY_MASK) != DIRTY) { 3249 view.mPrivateFlags = (view.mPrivateFlags & ~DIRTY_MASK) | opaqueFlag; 3250 } 3251 3252 parent = parent.invalidateChildInParent(location, dirty); 3253 if (view != null) { 3254 // Account for transform on current parent 3255 Matrix m = view.getMatrix(); 3256 if (!m.isIdentity()) { 3257 RectF boundingRect = attachInfo.mTmpTransformRect; 3258 boundingRect.set(dirty); 3259 m.mapRect(boundingRect); 3260 dirty.set((int) boundingRect.left, (int) boundingRect.top, 3261 (int) (boundingRect.right + 0.5f), 3262 (int) (boundingRect.bottom + 0.5f)); 3263 } 3264 } 3265 } while (parent != null); 3266 } 3267 } 3268 3269 /** 3270 * Don't call or override this method. It is used for the implementation of 3271 * the view hierarchy. 3272 * 3273 * This implementation returns null if this ViewGroup does not have a parent, 3274 * if this ViewGroup is already fully invalidated or if the dirty rectangle 3275 * does not intersect with this ViewGroup's bounds. 3276 */ 3277 public ViewParent invalidateChildInParent(final int[] location, final Rect dirty) { 3278 if (ViewDebug.TRACE_HIERARCHY) { 3279 ViewDebug.trace(this, ViewDebug.HierarchyTraceType.INVALIDATE_CHILD_IN_PARENT); 3280 } 3281 3282 if ((mPrivateFlags & DRAWN) == DRAWN) { 3283 if ((mGroupFlags & (FLAG_OPTIMIZE_INVALIDATE | FLAG_ANIMATION_DONE)) != 3284 FLAG_OPTIMIZE_INVALIDATE) { 3285 dirty.offset(location[CHILD_LEFT_INDEX] - mScrollX, 3286 location[CHILD_TOP_INDEX] - mScrollY); 3287 3288 final int left = mLeft; 3289 final int top = mTop; 3290 3291 if (dirty.intersect(0, 0, mRight - left, mBottom - top) || 3292 (mPrivateFlags & DRAW_ANIMATION) == DRAW_ANIMATION) { 3293 mPrivateFlags &= ~DRAWING_CACHE_VALID; 3294 3295 location[CHILD_LEFT_INDEX] = left; 3296 location[CHILD_TOP_INDEX] = top; 3297 3298 return mParent; 3299 } 3300 } else { 3301 mPrivateFlags &= ~DRAWN & ~DRAWING_CACHE_VALID; 3302 3303 location[CHILD_LEFT_INDEX] = mLeft; 3304 location[CHILD_TOP_INDEX] = mTop; 3305 3306 dirty.set(0, 0, mRight - location[CHILD_LEFT_INDEX], 3307 mBottom - location[CHILD_TOP_INDEX]); 3308 3309 return mParent; 3310 } 3311 } 3312 3313 return null; 3314 } 3315 3316 /** 3317 * Offset a rectangle that is in a descendant's coordinate 3318 * space into our coordinate space. 3319 * @param descendant A descendant of this view 3320 * @param rect A rectangle defined in descendant's coordinate space. 3321 */ 3322 public final void offsetDescendantRectToMyCoords(View descendant, Rect rect) { 3323 offsetRectBetweenParentAndChild(descendant, rect, true, false); 3324 } 3325 3326 /** 3327 * Offset a rectangle that is in our coordinate space into an ancestor's 3328 * coordinate space. 3329 * @param descendant A descendant of this view 3330 * @param rect A rectangle defined in descendant's coordinate space. 3331 */ 3332 public final void offsetRectIntoDescendantCoords(View descendant, Rect rect) { 3333 offsetRectBetweenParentAndChild(descendant, rect, false, false); 3334 } 3335 3336 /** 3337 * Helper method that offsets a rect either from parent to descendant or 3338 * descendant to parent. 3339 */ 3340 void offsetRectBetweenParentAndChild(View descendant, Rect rect, 3341 boolean offsetFromChildToParent, boolean clipToBounds) { 3342 3343 // already in the same coord system :) 3344 if (descendant == this) { 3345 return; 3346 } 3347 3348 ViewParent theParent = descendant.mParent; 3349 3350 // search and offset up to the parent 3351 while ((theParent != null) 3352 && (theParent instanceof View) 3353 && (theParent != this)) { 3354 3355 if (offsetFromChildToParent) { 3356 rect.offset(descendant.mLeft - descendant.mScrollX, 3357 descendant.mTop - descendant.mScrollY); 3358 if (clipToBounds) { 3359 View p = (View) theParent; 3360 rect.intersect(0, 0, p.mRight - p.mLeft, p.mBottom - p.mTop); 3361 } 3362 } else { 3363 if (clipToBounds) { 3364 View p = (View) theParent; 3365 rect.intersect(0, 0, p.mRight - p.mLeft, p.mBottom - p.mTop); 3366 } 3367 rect.offset(descendant.mScrollX - descendant.mLeft, 3368 descendant.mScrollY - descendant.mTop); 3369 } 3370 3371 descendant = (View) theParent; 3372 theParent = descendant.mParent; 3373 } 3374 3375 // now that we are up to this view, need to offset one more time 3376 // to get into our coordinate space 3377 if (theParent == this) { 3378 if (offsetFromChildToParent) { 3379 rect.offset(descendant.mLeft - descendant.mScrollX, 3380 descendant.mTop - descendant.mScrollY); 3381 } else { 3382 rect.offset(descendant.mScrollX - descendant.mLeft, 3383 descendant.mScrollY - descendant.mTop); 3384 } 3385 } else { 3386 throw new IllegalArgumentException("parameter must be a descendant of this view"); 3387 } 3388 } 3389 3390 /** 3391 * Offset the vertical location of all children of this view by the specified number of pixels. 3392 * 3393 * @param offset the number of pixels to offset 3394 * 3395 * @hide 3396 */ 3397 public void offsetChildrenTopAndBottom(int offset) { 3398 final int count = mChildrenCount; 3399 final View[] children = mChildren; 3400 3401 for (int i = 0; i < count; i++) { 3402 final View v = children[i]; 3403 v.mTop += offset; 3404 v.mBottom += offset; 3405 } 3406 } 3407 3408 /** 3409 * {@inheritDoc} 3410 */ 3411 public boolean getChildVisibleRect(View child, Rect r, android.graphics.Point offset) { 3412 int dx = child.mLeft - mScrollX; 3413 int dy = child.mTop - mScrollY; 3414 if (offset != null) { 3415 offset.x += dx; 3416 offset.y += dy; 3417 } 3418 r.offset(dx, dy); 3419 return r.intersect(0, 0, mRight - mLeft, mBottom - mTop) && 3420 (mParent == null || mParent.getChildVisibleRect(this, r, offset)); 3421 } 3422 3423 /** 3424 * {@inheritDoc} 3425 */ 3426 @Override 3427 protected abstract void onLayout(boolean changed, 3428 int l, int t, int r, int b); 3429 3430 /** 3431 * Indicates whether the view group has the ability to animate its children 3432 * after the first layout. 3433 * 3434 * @return true if the children can be animated, false otherwise 3435 */ 3436 protected boolean canAnimate() { 3437 return mLayoutAnimationController != null; 3438 } 3439 3440 /** 3441 * Runs the layout animation. Calling this method triggers a relayout of 3442 * this view group. 3443 */ 3444 public void startLayoutAnimation() { 3445 if (mLayoutAnimationController != null) { 3446 mGroupFlags |= FLAG_RUN_ANIMATION; 3447 requestLayout(); 3448 } 3449 } 3450 3451 /** 3452 * Schedules the layout animation to be played after the next layout pass 3453 * of this view group. This can be used to restart the layout animation 3454 * when the content of the view group changes or when the activity is 3455 * paused and resumed. 3456 */ 3457 public void scheduleLayoutAnimation() { 3458 mGroupFlags |= FLAG_RUN_ANIMATION; 3459 } 3460 3461 /** 3462 * Sets the layout animation controller used to animate the group's 3463 * children after the first layout. 3464 * 3465 * @param controller the animation controller 3466 */ 3467 public void setLayoutAnimation(LayoutAnimationController controller) { 3468 mLayoutAnimationController = controller; 3469 if (mLayoutAnimationController != null) { 3470 mGroupFlags |= FLAG_RUN_ANIMATION; 3471 } 3472 } 3473 3474 /** 3475 * Returns the layout animation controller used to animate the group's 3476 * children. 3477 * 3478 * @return the current animation controller 3479 */ 3480 public LayoutAnimationController getLayoutAnimation() { 3481 return mLayoutAnimationController; 3482 } 3483 3484 /** 3485 * Indicates whether the children's drawing cache is used during a layout 3486 * animation. By default, the drawing cache is enabled but this will prevent 3487 * nested layout animations from working. To nest animations, you must disable 3488 * the cache. 3489 * 3490 * @return true if the animation cache is enabled, false otherwise 3491 * 3492 * @see #setAnimationCacheEnabled(boolean) 3493 * @see View#setDrawingCacheEnabled(boolean) 3494 */ 3495 @ViewDebug.ExportedProperty 3496 public boolean isAnimationCacheEnabled() { 3497 return (mGroupFlags & FLAG_ANIMATION_CACHE) == FLAG_ANIMATION_CACHE; 3498 } 3499 3500 /** 3501 * Enables or disables the children's drawing cache during a layout animation. 3502 * By default, the drawing cache is enabled but this will prevent nested 3503 * layout animations from working. To nest animations, you must disable the 3504 * cache. 3505 * 3506 * @param enabled true to enable the animation cache, false otherwise 3507 * 3508 * @see #isAnimationCacheEnabled() 3509 * @see View#setDrawingCacheEnabled(boolean) 3510 */ 3511 public void setAnimationCacheEnabled(boolean enabled) { 3512 setBooleanFlag(FLAG_ANIMATION_CACHE, enabled); 3513 } 3514 3515 /** 3516 * Indicates whether this ViewGroup will always try to draw its children using their 3517 * drawing cache. By default this property is enabled. 3518 * 3519 * @return true if the animation cache is enabled, false otherwise 3520 * 3521 * @see #setAlwaysDrawnWithCacheEnabled(boolean) 3522 * @see #setChildrenDrawnWithCacheEnabled(boolean) 3523 * @see View#setDrawingCacheEnabled(boolean) 3524 */ 3525 @ViewDebug.ExportedProperty(category = "drawing") 3526 public boolean isAlwaysDrawnWithCacheEnabled() { 3527 return (mGroupFlags & FLAG_ALWAYS_DRAWN_WITH_CACHE) == FLAG_ALWAYS_DRAWN_WITH_CACHE; 3528 } 3529 3530 /** 3531 * Indicates whether this ViewGroup will always try to draw its children using their 3532 * drawing cache. This property can be set to true when the cache rendering is 3533 * slightly different from the children's normal rendering. Renderings can be different, 3534 * for instance, when the cache's quality is set to low. 3535 * 3536 * When this property is disabled, the ViewGroup will use the drawing cache of its 3537 * children only when asked to. It's usually the task of subclasses to tell ViewGroup 3538 * when to start using the drawing cache and when to stop using it. 3539 * 3540 * @param always true to always draw with the drawing cache, false otherwise 3541 * 3542 * @see #isAlwaysDrawnWithCacheEnabled() 3543 * @see #setChildrenDrawnWithCacheEnabled(boolean) 3544 * @see View#setDrawingCacheEnabled(boolean) 3545 * @see View#setDrawingCacheQuality(int) 3546 */ 3547 public void setAlwaysDrawnWithCacheEnabled(boolean always) { 3548 setBooleanFlag(FLAG_ALWAYS_DRAWN_WITH_CACHE, always); 3549 } 3550 3551 /** 3552 * Indicates whether the ViewGroup is currently drawing its children using 3553 * their drawing cache. 3554 * 3555 * @return true if children should be drawn with their cache, false otherwise 3556 * 3557 * @see #setAlwaysDrawnWithCacheEnabled(boolean) 3558 * @see #setChildrenDrawnWithCacheEnabled(boolean) 3559 */ 3560 @ViewDebug.ExportedProperty(category = "drawing") 3561 protected boolean isChildrenDrawnWithCacheEnabled() { 3562 return (mGroupFlags & FLAG_CHILDREN_DRAWN_WITH_CACHE) == FLAG_CHILDREN_DRAWN_WITH_CACHE; 3563 } 3564 3565 /** 3566 * Tells the ViewGroup to draw its children using their drawing cache. This property 3567 * is ignored when {@link #isAlwaysDrawnWithCacheEnabled()} is true. A child's drawing cache 3568 * will be used only if it has been enabled. 3569 * 3570 * Subclasses should call this method to start and stop using the drawing cache when 3571 * they perform performance sensitive operations, like scrolling or animating. 3572 * 3573 * @param enabled true if children should be drawn with their cache, false otherwise 3574 * 3575 * @see #setAlwaysDrawnWithCacheEnabled(boolean) 3576 * @see #isChildrenDrawnWithCacheEnabled() 3577 */ 3578 protected void setChildrenDrawnWithCacheEnabled(boolean enabled) { 3579 setBooleanFlag(FLAG_CHILDREN_DRAWN_WITH_CACHE, enabled); 3580 } 3581 3582 /** 3583 * Indicates whether the ViewGroup is drawing its children in the order defined by 3584 * {@link #getChildDrawingOrder(int, int)}. 3585 * 3586 * @return true if children drawing order is defined by {@link #getChildDrawingOrder(int, int)}, 3587 * false otherwise 3588 * 3589 * @see #setChildrenDrawingOrderEnabled(boolean) 3590 * @see #getChildDrawingOrder(int, int) 3591 */ 3592 @ViewDebug.ExportedProperty(category = "drawing") 3593 protected boolean isChildrenDrawingOrderEnabled() { 3594 return (mGroupFlags & FLAG_USE_CHILD_DRAWING_ORDER) == FLAG_USE_CHILD_DRAWING_ORDER; 3595 } 3596 3597 /** 3598 * Tells the ViewGroup whether to draw its children in the order defined by the method 3599 * {@link #getChildDrawingOrder(int, int)}. 3600 * 3601 * @param enabled true if the order of the children when drawing is determined by 3602 * {@link #getChildDrawingOrder(int, int)}, false otherwise 3603 * 3604 * @see #isChildrenDrawingOrderEnabled() 3605 * @see #getChildDrawingOrder(int, int) 3606 */ 3607 protected void setChildrenDrawingOrderEnabled(boolean enabled) { 3608 setBooleanFlag(FLAG_USE_CHILD_DRAWING_ORDER, enabled); 3609 } 3610 3611 private void setBooleanFlag(int flag, boolean value) { 3612 if (value) { 3613 mGroupFlags |= flag; 3614 } else { 3615 mGroupFlags &= ~flag; 3616 } 3617 } 3618 3619 /** 3620 * Returns an integer indicating what types of drawing caches are kept in memory. 3621 * 3622 * @see #setPersistentDrawingCache(int) 3623 * @see #setAnimationCacheEnabled(boolean) 3624 * 3625 * @return one or a combination of {@link #PERSISTENT_NO_CACHE}, 3626 * {@link #PERSISTENT_ANIMATION_CACHE}, {@link #PERSISTENT_SCROLLING_CACHE} 3627 * and {@link #PERSISTENT_ALL_CACHES} 3628 */ 3629 @ViewDebug.ExportedProperty(category = "drawing", mapping = { 3630 @ViewDebug.IntToString(from = PERSISTENT_NO_CACHE, to = "NONE"), 3631 @ViewDebug.IntToString(from = PERSISTENT_ANIMATION_CACHE, to = "ANIMATION"), 3632 @ViewDebug.IntToString(from = PERSISTENT_SCROLLING_CACHE, to = "SCROLLING"), 3633 @ViewDebug.IntToString(from = PERSISTENT_ALL_CACHES, to = "ALL") 3634 }) 3635 public int getPersistentDrawingCache() { 3636 return mPersistentDrawingCache; 3637 } 3638 3639 /** 3640 * Indicates what types of drawing caches should be kept in memory after 3641 * they have been created. 3642 * 3643 * @see #getPersistentDrawingCache() 3644 * @see #setAnimationCacheEnabled(boolean) 3645 * 3646 * @param drawingCacheToKeep one or a combination of {@link #PERSISTENT_NO_CACHE}, 3647 * {@link #PERSISTENT_ANIMATION_CACHE}, {@link #PERSISTENT_SCROLLING_CACHE} 3648 * and {@link #PERSISTENT_ALL_CACHES} 3649 */ 3650 public void setPersistentDrawingCache(int drawingCacheToKeep) { 3651 mPersistentDrawingCache = drawingCacheToKeep & PERSISTENT_ALL_CACHES; 3652 } 3653 3654 /** 3655 * Returns a new set of layout parameters based on the supplied attributes set. 3656 * 3657 * @param attrs the attributes to build the layout parameters from 3658 * 3659 * @return an instance of {@link android.view.ViewGroup.LayoutParams} or one 3660 * of its descendants 3661 */ 3662 public LayoutParams generateLayoutParams(AttributeSet attrs) { 3663 return new LayoutParams(getContext(), attrs); 3664 } 3665 3666 /** 3667 * Returns a safe set of layout parameters based on the supplied layout params. 3668 * When a ViewGroup is passed a View whose layout params do not pass the test of 3669 * {@link #checkLayoutParams(android.view.ViewGroup.LayoutParams)}, this method 3670 * is invoked. This method should return a new set of layout params suitable for 3671 * this ViewGroup, possibly by copying the appropriate attributes from the 3672 * specified set of layout params. 3673 * 3674 * @param p The layout parameters to convert into a suitable set of layout parameters 3675 * for this ViewGroup. 3676 * 3677 * @return an instance of {@link android.view.ViewGroup.LayoutParams} or one 3678 * of its descendants 3679 */ 3680 protected LayoutParams generateLayoutParams(ViewGroup.LayoutParams p) { 3681 return p; 3682 } 3683 3684 /** 3685 * Returns a set of default layout parameters. These parameters are requested 3686 * when the View passed to {@link #addView(View)} has no layout parameters 3687 * already set. If null is returned, an exception is thrown from addView. 3688 * 3689 * @return a set of default layout parameters or null 3690 */ 3691 protected LayoutParams generateDefaultLayoutParams() { 3692 return new LayoutParams(LayoutParams.WRAP_CONTENT, LayoutParams.WRAP_CONTENT); 3693 } 3694 3695 /** 3696 * @hide 3697 */ 3698 @Override 3699 protected boolean dispatchConsistencyCheck(int consistency) { 3700 boolean result = super.dispatchConsistencyCheck(consistency); 3701 3702 final int count = mChildrenCount; 3703 final View[] children = mChildren; 3704 for (int i = 0; i < count; i++) { 3705 if (!children[i].dispatchConsistencyCheck(consistency)) result = false; 3706 } 3707 3708 return result; 3709 } 3710 3711 /** 3712 * @hide 3713 */ 3714 @Override 3715 protected boolean onConsistencyCheck(int consistency) { 3716 boolean result = super.onConsistencyCheck(consistency); 3717 3718 final boolean checkLayout = (consistency & ViewDebug.CONSISTENCY_LAYOUT) != 0; 3719 final boolean checkDrawing = (consistency & ViewDebug.CONSISTENCY_DRAWING) != 0; 3720 3721 if (checkLayout) { 3722 final int count = mChildrenCount; 3723 final View[] children = mChildren; 3724 for (int i = 0; i < count; i++) { 3725 if (children[i].getParent() != this) { 3726 result = false; 3727 android.util.Log.d(ViewDebug.CONSISTENCY_LOG_TAG, 3728 "View " + children[i] + " has no parent/a parent that is not " + this); 3729 } 3730 } 3731 } 3732 3733 if (checkDrawing) { 3734 // If this group is dirty, check that the parent is dirty as well 3735 if ((mPrivateFlags & DIRTY_MASK) != 0) { 3736 final ViewParent parent = getParent(); 3737 if (parent != null && !(parent instanceof ViewRoot)) { 3738 if ((((View) parent).mPrivateFlags & DIRTY_MASK) == 0) { 3739 result = false; 3740 android.util.Log.d(ViewDebug.CONSISTENCY_LOG_TAG, 3741 "ViewGroup " + this + " is dirty but its parent is not: " + this); 3742 } 3743 } 3744 } 3745 } 3746 3747 return result; 3748 } 3749 3750 /** 3751 * {@inheritDoc} 3752 */ 3753 @Override 3754 protected void debug(int depth) { 3755 super.debug(depth); 3756 String output; 3757 3758 if (mFocused != null) { 3759 output = debugIndent(depth); 3760 output += "mFocused"; 3761 Log.d(VIEW_LOG_TAG, output); 3762 } 3763 if (mChildrenCount != 0) { 3764 output = debugIndent(depth); 3765 output += "{"; 3766 Log.d(VIEW_LOG_TAG, output); 3767 } 3768 int count = mChildrenCount; 3769 for (int i = 0; i < count; i++) { 3770 View child = mChildren[i]; 3771 child.debug(depth + 1); 3772 } 3773 3774 if (mChildrenCount != 0) { 3775 output = debugIndent(depth); 3776 output += "}"; 3777 Log.d(VIEW_LOG_TAG, output); 3778 } 3779 } 3780 3781 /** 3782 * Returns the position in the group of the specified child view. 3783 * 3784 * @param child the view for which to get the position 3785 * @return a positive integer representing the position of the view in the 3786 * group, or -1 if the view does not exist in the group 3787 */ 3788 public int indexOfChild(View child) { 3789 final int count = mChildrenCount; 3790 final View[] children = mChildren; 3791 for (int i = 0; i < count; i++) { 3792 if (children[i] == child) { 3793 return i; 3794 } 3795 } 3796 return -1; 3797 } 3798 3799 /** 3800 * Returns the number of children in the group. 3801 * 3802 * @return a positive integer representing the number of children in 3803 * the group 3804 */ 3805 public int getChildCount() { 3806 return mChildrenCount; 3807 } 3808 3809 /** 3810 * Returns the view at the specified position in the group. 3811 * 3812 * @param index the position at which to get the view from 3813 * @return the view at the specified position or null if the position 3814 * does not exist within the group 3815 */ 3816 public View getChildAt(int index) { 3817 try { 3818 return mChildren[index]; 3819 } catch (IndexOutOfBoundsException ex) { 3820 return null; 3821 } 3822 } 3823 3824 /** 3825 * Ask all of the children of this view to measure themselves, taking into 3826 * account both the MeasureSpec requirements for this view and its padding. 3827 * We skip children that are in the GONE state The heavy lifting is done in 3828 * getChildMeasureSpec. 3829 * 3830 * @param widthMeasureSpec The width requirements for this view 3831 * @param heightMeasureSpec The height requirements for this view 3832 */ 3833 protected void measureChildren(int widthMeasureSpec, int heightMeasureSpec) { 3834 final int size = mChildrenCount; 3835 final View[] children = mChildren; 3836 for (int i = 0; i < size; ++i) { 3837 final View child = children[i]; 3838 if ((child.mViewFlags & VISIBILITY_MASK) != GONE) { 3839 measureChild(child, widthMeasureSpec, heightMeasureSpec); 3840 } 3841 } 3842 } 3843 3844 /** 3845 * Ask one of the children of this view to measure itself, taking into 3846 * account both the MeasureSpec requirements for this view and its padding. 3847 * The heavy lifting is done in getChildMeasureSpec. 3848 * 3849 * @param child The child to measure 3850 * @param parentWidthMeasureSpec The width requirements for this view 3851 * @param parentHeightMeasureSpec The height requirements for this view 3852 */ 3853 protected void measureChild(View child, int parentWidthMeasureSpec, 3854 int parentHeightMeasureSpec) { 3855 final LayoutParams lp = child.getLayoutParams(); 3856 3857 final int childWidthMeasureSpec = getChildMeasureSpec(parentWidthMeasureSpec, 3858 mPaddingLeft + mPaddingRight, lp.width); 3859 final int childHeightMeasureSpec = getChildMeasureSpec(parentHeightMeasureSpec, 3860 mPaddingTop + mPaddingBottom, lp.height); 3861 3862 child.measure(childWidthMeasureSpec, childHeightMeasureSpec); 3863 } 3864 3865 /** 3866 * Ask one of the children of this view to measure itself, taking into 3867 * account both the MeasureSpec requirements for this view and its padding 3868 * and margins. The child must have MarginLayoutParams The heavy lifting is 3869 * done in getChildMeasureSpec. 3870 * 3871 * @param child The child to measure 3872 * @param parentWidthMeasureSpec The width requirements for this view 3873 * @param widthUsed Extra space that has been used up by the parent 3874 * horizontally (possibly by other children of the parent) 3875 * @param parentHeightMeasureSpec The height requirements for this view 3876 * @param heightUsed Extra space that has been used up by the parent 3877 * vertically (possibly by other children of the parent) 3878 */ 3879 protected void measureChildWithMargins(View child, 3880 int parentWidthMeasureSpec, int widthUsed, 3881 int parentHeightMeasureSpec, int heightUsed) { 3882 final MarginLayoutParams lp = (MarginLayoutParams) child.getLayoutParams(); 3883 3884 final int childWidthMeasureSpec = getChildMeasureSpec(parentWidthMeasureSpec, 3885 mPaddingLeft + mPaddingRight + lp.leftMargin + lp.rightMargin 3886 + widthUsed, lp.width); 3887 final int childHeightMeasureSpec = getChildMeasureSpec(parentHeightMeasureSpec, 3888 mPaddingTop + mPaddingBottom + lp.topMargin + lp.bottomMargin 3889 + heightUsed, lp.height); 3890 3891 child.measure(childWidthMeasureSpec, childHeightMeasureSpec); 3892 } 3893 3894 /** 3895 * Does the hard part of measureChildren: figuring out the MeasureSpec to 3896 * pass to a particular child. This method figures out the right MeasureSpec 3897 * for one dimension (height or width) of one child view. 3898 * 3899 * The goal is to combine information from our MeasureSpec with the 3900 * LayoutParams of the child to get the best possible results. For example, 3901 * if the this view knows its size (because its MeasureSpec has a mode of 3902 * EXACTLY), and the child has indicated in its LayoutParams that it wants 3903 * to be the same size as the parent, the parent should ask the child to 3904 * layout given an exact size. 3905 * 3906 * @param spec The requirements for this view 3907 * @param padding The padding of this view for the current dimension and 3908 * margins, if applicable 3909 * @param childDimension How big the child wants to be in the current 3910 * dimension 3911 * @return a MeasureSpec integer for the child 3912 */ 3913 public static int getChildMeasureSpec(int spec, int padding, int childDimension) { 3914 int specMode = MeasureSpec.getMode(spec); 3915 int specSize = MeasureSpec.getSize(spec); 3916 3917 int size = Math.max(0, specSize - padding); 3918 3919 int resultSize = 0; 3920 int resultMode = 0; 3921 3922 switch (specMode) { 3923 // Parent has imposed an exact size on us 3924 case MeasureSpec.EXACTLY: 3925 if (childDimension >= 0) { 3926 resultSize = childDimension; 3927 resultMode = MeasureSpec.EXACTLY; 3928 } else if (childDimension == LayoutParams.MATCH_PARENT) { 3929 // Child wants to be our size. So be it. 3930 resultSize = size; 3931 resultMode = MeasureSpec.EXACTLY; 3932 } else if (childDimension == LayoutParams.WRAP_CONTENT) { 3933 // Child wants to determine its own size. It can't be 3934 // bigger than us. 3935 resultSize = size; 3936 resultMode = MeasureSpec.AT_MOST; 3937 } 3938 break; 3939 3940 // Parent has imposed a maximum size on us 3941 case MeasureSpec.AT_MOST: 3942 if (childDimension >= 0) { 3943 // Child wants a specific size... so be it 3944 resultSize = childDimension; 3945 resultMode = MeasureSpec.EXACTLY; 3946 } else if (childDimension == LayoutParams.MATCH_PARENT) { 3947 // Child wants to be our size, but our size is not fixed. 3948 // Constrain child to not be bigger than us. 3949 resultSize = size; 3950 resultMode = MeasureSpec.AT_MOST; 3951 } else if (childDimension == LayoutParams.WRAP_CONTENT) { 3952 // Child wants to determine its own size. It can't be 3953 // bigger than us. 3954 resultSize = size; 3955 resultMode = MeasureSpec.AT_MOST; 3956 } 3957 break; 3958 3959 // Parent asked to see how big we want to be 3960 case MeasureSpec.UNSPECIFIED: 3961 if (childDimension >= 0) { 3962 // Child wants a specific size... let him have it 3963 resultSize = childDimension; 3964 resultMode = MeasureSpec.EXACTLY; 3965 } else if (childDimension == LayoutParams.MATCH_PARENT) { 3966 // Child wants to be our size... find out how big it should 3967 // be 3968 resultSize = 0; 3969 resultMode = MeasureSpec.UNSPECIFIED; 3970 } else if (childDimension == LayoutParams.WRAP_CONTENT) { 3971 // Child wants to determine its own size.... find out how 3972 // big it should be 3973 resultSize = 0; 3974 resultMode = MeasureSpec.UNSPECIFIED; 3975 } 3976 break; 3977 } 3978 return MeasureSpec.makeMeasureSpec(resultSize, resultMode); 3979 } 3980 3981 3982 /** 3983 * Removes any pending animations for views that have been removed. Call 3984 * this if you don't want animations for exiting views to stack up. 3985 */ 3986 public void clearDisappearingChildren() { 3987 if (mDisappearingChildren != null) { 3988 mDisappearingChildren.clear(); 3989 } 3990 } 3991 3992 /** 3993 * Add a view which is removed from mChildren but still needs animation 3994 * 3995 * @param v View to add 3996 */ 3997 private void addDisappearingView(View v) { 3998 ArrayList<View> disappearingChildren = mDisappearingChildren; 3999 4000 if (disappearingChildren == null) { 4001 disappearingChildren = mDisappearingChildren = new ArrayList<View>(); 4002 } 4003 4004 disappearingChildren.add(v); 4005 } 4006 4007 /** 4008 * Cleanup a view when its animation is done. This may mean removing it from 4009 * the list of disappearing views. 4010 * 4011 * @param view The view whose animation has finished 4012 * @param animation The animation, cannot be null 4013 */ 4014 private void finishAnimatingView(final View view, Animation animation) { 4015 final ArrayList<View> disappearingChildren = mDisappearingChildren; 4016 if (disappearingChildren != null) { 4017 if (disappearingChildren.contains(view)) { 4018 disappearingChildren.remove(view); 4019 4020 if (view.mAttachInfo != null) { 4021 view.dispatchDetachedFromWindow(); 4022 } 4023 4024 view.clearAnimation(); 4025 mGroupFlags |= FLAG_INVALIDATE_REQUIRED; 4026 } 4027 } 4028 4029 if (animation != null && !animation.getFillAfter()) { 4030 view.clearAnimation(); 4031 } 4032 4033 if ((view.mPrivateFlags & ANIMATION_STARTED) == ANIMATION_STARTED) { 4034 view.onAnimationEnd(); 4035 // Should be performed by onAnimationEnd() but this avoid an infinite loop, 4036 // so we'd rather be safe than sorry 4037 view.mPrivateFlags &= ~ANIMATION_STARTED; 4038 // Draw one more frame after the animation is done 4039 mGroupFlags |= FLAG_INVALIDATE_REQUIRED; 4040 } 4041 } 4042 4043 /** 4044 * This method tells the ViewGroup that the given View object, which should have this 4045 * ViewGroup as its parent, 4046 * should be kept around (re-displayed when the ViewGroup draws its children) even if it 4047 * is removed from its parent. This allows animations, such as those used by 4048 * {@link android.app.Fragment} and {@link android.animation.LayoutTransition} to animate 4049 * the removal of views. A call to this method should always be accompanied by a later call 4050 * to {@link #endViewTransition(View)}, such as after an animation on the View has finished, 4051 * so that the View finally gets removed. 4052 * 4053 * @param view The View object to be kept visible even if it gets removed from its parent. 4054 */ 4055 public void startViewTransition(View view) { 4056 if (view.mParent == this) { 4057 if (mTransitioningViews == null) { 4058 mTransitioningViews = new ArrayList<View>(); 4059 } 4060 mTransitioningViews.add(view); 4061 } 4062 } 4063 4064 /** 4065 * This method should always be called following an earlier call to 4066 * {@link #startViewTransition(View)}. The given View is finally removed from its parent 4067 * and will no longer be displayed. Note that this method does not perform the functionality 4068 * of removing a view from its parent; it just discontinues the display of a View that 4069 * has previously been removed. 4070 * 4071 * @return view The View object that has been removed but is being kept around in the visible 4072 * hierarchy by an earlier call to {@link #startViewTransition(View)}. 4073 */ 4074 public void endViewTransition(View view) { 4075 if (mTransitioningViews != null) { 4076 mTransitioningViews.remove(view); 4077 final ArrayList<View> disappearingChildren = mDisappearingChildren; 4078 if (disappearingChildren != null && disappearingChildren.contains(view)) { 4079 disappearingChildren.remove(view); 4080 if (mVisibilityChangingChildren != null && 4081 mVisibilityChangingChildren.contains(view)) { 4082 mVisibilityChangingChildren.remove(view); 4083 } else { 4084 if (view.mAttachInfo != null) { 4085 view.dispatchDetachedFromWindow(); 4086 } 4087 if (view.mParent != null) { 4088 view.mParent = null; 4089 } 4090 } 4091 mGroupFlags |= FLAG_INVALIDATE_REQUIRED; 4092 } 4093 } 4094 } 4095 4096 private LayoutTransition.TransitionListener mLayoutTransitionListener = 4097 new LayoutTransition.TransitionListener() { 4098 @Override 4099 public void startTransition(LayoutTransition transition, ViewGroup container, 4100 View view, int transitionType) { 4101 // We only care about disappearing items, since we need special logic to keep 4102 // those items visible after they've been 'removed' 4103 if (transitionType == LayoutTransition.DISAPPEARING) { 4104 startViewTransition(view); 4105 } 4106 } 4107 4108 @Override 4109 public void endTransition(LayoutTransition transition, ViewGroup container, 4110 View view, int transitionType) { 4111 if (transitionType == LayoutTransition.DISAPPEARING && mTransitioningViews != null) { 4112 endViewTransition(view); 4113 } 4114 } 4115 }; 4116 4117 /** 4118 * {@inheritDoc} 4119 */ 4120 @Override 4121 public boolean gatherTransparentRegion(Region region) { 4122 // If no transparent regions requested, we are always opaque. 4123 final boolean meOpaque = (mPrivateFlags & View.REQUEST_TRANSPARENT_REGIONS) == 0; 4124 if (meOpaque && region == null) { 4125 // The caller doesn't care about the region, so stop now. 4126 return true; 4127 } 4128 super.gatherTransparentRegion(region); 4129 final View[] children = mChildren; 4130 final int count = mChildrenCount; 4131 boolean noneOfTheChildrenAreTransparent = true; 4132 for (int i = 0; i < count; i++) { 4133 final View child = children[i]; 4134 if ((child.mViewFlags & VISIBILITY_MASK) != GONE || child.getAnimation() != null) { 4135 if (!child.gatherTransparentRegion(region)) { 4136 noneOfTheChildrenAreTransparent = false; 4137 } 4138 } 4139 } 4140 return meOpaque || noneOfTheChildrenAreTransparent; 4141 } 4142 4143 /** 4144 * {@inheritDoc} 4145 */ 4146 public void requestTransparentRegion(View child) { 4147 if (child != null) { 4148 child.mPrivateFlags |= View.REQUEST_TRANSPARENT_REGIONS; 4149 if (mParent != null) { 4150 mParent.requestTransparentRegion(this); 4151 } 4152 } 4153 } 4154 4155 4156 @Override 4157 protected boolean fitSystemWindows(Rect insets) { 4158 boolean done = super.fitSystemWindows(insets); 4159 if (!done) { 4160 final int count = mChildrenCount; 4161 final View[] children = mChildren; 4162 for (int i = 0; i < count; i++) { 4163 done = children[i].fitSystemWindows(insets); 4164 if (done) { 4165 break; 4166 } 4167 } 4168 } 4169 return done; 4170 } 4171 4172 /** 4173 * Returns the animation listener to which layout animation events are 4174 * sent. 4175 * 4176 * @return an {@link android.view.animation.Animation.AnimationListener} 4177 */ 4178 public Animation.AnimationListener getLayoutAnimationListener() { 4179 return mAnimationListener; 4180 } 4181 4182 @Override 4183 protected void drawableStateChanged() { 4184 super.drawableStateChanged(); 4185 4186 if ((mGroupFlags & FLAG_NOTIFY_CHILDREN_ON_DRAWABLE_STATE_CHANGE) != 0) { 4187 if ((mGroupFlags & FLAG_ADD_STATES_FROM_CHILDREN) != 0) { 4188 throw new IllegalStateException("addStateFromChildren cannot be enabled if a" 4189 + " child has duplicateParentState set to true"); 4190 } 4191 4192 final View[] children = mChildren; 4193 final int count = mChildrenCount; 4194 4195 for (int i = 0; i < count; i++) { 4196 final View child = children[i]; 4197 if ((child.mViewFlags & DUPLICATE_PARENT_STATE) != 0) { 4198 child.refreshDrawableState(); 4199 } 4200 } 4201 } 4202 } 4203 4204 @Override 4205 protected int[] onCreateDrawableState(int extraSpace) { 4206 if ((mGroupFlags & FLAG_ADD_STATES_FROM_CHILDREN) == 0) { 4207 return super.onCreateDrawableState(extraSpace); 4208 } 4209 4210 int need = 0; 4211 int n = getChildCount(); 4212 for (int i = 0; i < n; i++) { 4213 int[] childState = getChildAt(i).getDrawableState(); 4214 4215 if (childState != null) { 4216 need += childState.length; 4217 } 4218 } 4219 4220 int[] state = super.onCreateDrawableState(extraSpace + need); 4221 4222 for (int i = 0; i < n; i++) { 4223 int[] childState = getChildAt(i).getDrawableState(); 4224 4225 if (childState != null) { 4226 state = mergeDrawableStates(state, childState); 4227 } 4228 } 4229 4230 return state; 4231 } 4232 4233 /** 4234 * Sets whether this ViewGroup's drawable states also include 4235 * its children's drawable states. This is used, for example, to 4236 * make a group appear to be focused when its child EditText or button 4237 * is focused. 4238 */ 4239 public void setAddStatesFromChildren(boolean addsStates) { 4240 if (addsStates) { 4241 mGroupFlags |= FLAG_ADD_STATES_FROM_CHILDREN; 4242 } else { 4243 mGroupFlags &= ~FLAG_ADD_STATES_FROM_CHILDREN; 4244 } 4245 4246 refreshDrawableState(); 4247 } 4248 4249 /** 4250 * Returns whether this ViewGroup's drawable states also include 4251 * its children's drawable states. This is used, for example, to 4252 * make a group appear to be focused when its child EditText or button 4253 * is focused. 4254 */ 4255 public boolean addStatesFromChildren() { 4256 return (mGroupFlags & FLAG_ADD_STATES_FROM_CHILDREN) != 0; 4257 } 4258 4259 /** 4260 * If {link #addStatesFromChildren} is true, refreshes this group's 4261 * drawable state (to include the states from its children). 4262 */ 4263 public void childDrawableStateChanged(View child) { 4264 if ((mGroupFlags & FLAG_ADD_STATES_FROM_CHILDREN) != 0) { 4265 refreshDrawableState(); 4266 } 4267 } 4268 4269 /** 4270 * Specifies the animation listener to which layout animation events must 4271 * be sent. Only 4272 * {@link android.view.animation.Animation.AnimationListener#onAnimationStart(Animation)} 4273 * and 4274 * {@link android.view.animation.Animation.AnimationListener#onAnimationEnd(Animation)} 4275 * are invoked. 4276 * 4277 * @param animationListener the layout animation listener 4278 */ 4279 public void setLayoutAnimationListener(Animation.AnimationListener animationListener) { 4280 mAnimationListener = animationListener; 4281 } 4282 4283 /** 4284 * LayoutParams are used by views to tell their parents how they want to be 4285 * laid out. See 4286 * {@link android.R.styleable#ViewGroup_Layout ViewGroup Layout Attributes} 4287 * for a list of all child view attributes that this class supports. 4288 * 4289 * <p> 4290 * The base LayoutParams class just describes how big the view wants to be 4291 * for both width and height. For each dimension, it can specify one of: 4292 * <ul> 4293 * <li>FILL_PARENT (renamed MATCH_PARENT in API Level 8 and higher), which 4294 * means that the view wants to be as big as its parent (minus padding) 4295 * <li> WRAP_CONTENT, which means that the view wants to be just big enough 4296 * to enclose its content (plus padding) 4297 * <li> an exact number 4298 * </ul> 4299 * There are subclasses of LayoutParams for different subclasses of 4300 * ViewGroup. For example, AbsoluteLayout has its own subclass of 4301 * LayoutParams which adds an X and Y value. 4302 * 4303 * @attr ref android.R.styleable#ViewGroup_Layout_layout_height 4304 * @attr ref android.R.styleable#ViewGroup_Layout_layout_width 4305 */ 4306 public static class LayoutParams { 4307 /** 4308 * Special value for the height or width requested by a View. 4309 * FILL_PARENT means that the view wants to be as big as its parent, 4310 * minus the parent's padding, if any. This value is deprecated 4311 * starting in API Level 8 and replaced by {@link #MATCH_PARENT}. 4312 */ 4313 @SuppressWarnings({"UnusedDeclaration"}) 4314 @Deprecated 4315 public static final int FILL_PARENT = -1; 4316 4317 /** 4318 * Special value for the height or width requested by a View. 4319 * MATCH_PARENT means that the view wants to be as big as its parent, 4320 * minus the parent's padding, if any. Introduced in API Level 8. 4321 */ 4322 public static final int MATCH_PARENT = -1; 4323 4324 /** 4325 * Special value for the height or width requested by a View. 4326 * WRAP_CONTENT means that the view wants to be just large enough to fit 4327 * its own internal content, taking its own padding into account. 4328 */ 4329 public static final int WRAP_CONTENT = -2; 4330 4331 /** 4332 * Information about how wide the view wants to be. Can be one of the 4333 * constants FILL_PARENT (replaced by MATCH_PARENT , 4334 * in API Level 8) or WRAP_CONTENT. or an exact size. 4335 */ 4336 @ViewDebug.ExportedProperty(category = "layout", mapping = { 4337 @ViewDebug.IntToString(from = MATCH_PARENT, to = "MATCH_PARENT"), 4338 @ViewDebug.IntToString(from = WRAP_CONTENT, to = "WRAP_CONTENT") 4339 }) 4340 public int width; 4341 4342 /** 4343 * Information about how tall the view wants to be. Can be one of the 4344 * constants FILL_PARENT (replaced by MATCH_PARENT , 4345 * in API Level 8) or WRAP_CONTENT. or an exact size. 4346 */ 4347 @ViewDebug.ExportedProperty(category = "layout", mapping = { 4348 @ViewDebug.IntToString(from = MATCH_PARENT, to = "MATCH_PARENT"), 4349 @ViewDebug.IntToString(from = WRAP_CONTENT, to = "WRAP_CONTENT") 4350 }) 4351 public int height; 4352 4353 /** 4354 * Used to animate layouts. 4355 */ 4356 public LayoutAnimationController.AnimationParameters layoutAnimationParameters; 4357 4358 /** 4359 * Creates a new set of layout parameters. The values are extracted from 4360 * the supplied attributes set and context. The XML attributes mapped 4361 * to this set of layout parameters are: 4362 * 4363 * <ul> 4364 * <li><code>layout_width</code>: the width, either an exact value, 4365 * {@link #WRAP_CONTENT}, or {@link #FILL_PARENT} (replaced by 4366 * {@link #MATCH_PARENT} in API Level 8)</li> 4367 * <li><code>layout_height</code>: the height, either an exact value, 4368 * {@link #WRAP_CONTENT}, or {@link #FILL_PARENT} (replaced by 4369 * {@link #MATCH_PARENT} in API Level 8)</li> 4370 * </ul> 4371 * 4372 * @param c the application environment 4373 * @param attrs the set of attributes from which to extract the layout 4374 * parameters' values 4375 */ 4376 public LayoutParams(Context c, AttributeSet attrs) { 4377 TypedArray a = c.obtainStyledAttributes(attrs, R.styleable.ViewGroup_Layout); 4378 setBaseAttributes(a, 4379 R.styleable.ViewGroup_Layout_layout_width, 4380 R.styleable.ViewGroup_Layout_layout_height); 4381 a.recycle(); 4382 } 4383 4384 /** 4385 * Creates a new set of layout parameters with the specified width 4386 * and height. 4387 * 4388 * @param width the width, either {@link #WRAP_CONTENT}, 4389 * {@link #FILL_PARENT} (replaced by {@link #MATCH_PARENT} in 4390 * API Level 8), or a fixed size in pixels 4391 * @param height the height, either {@link #WRAP_CONTENT}, 4392 * {@link #FILL_PARENT} (replaced by {@link #MATCH_PARENT} in 4393 * API Level 8), or a fixed size in pixels 4394 */ 4395 public LayoutParams(int width, int height) { 4396 this.width = width; 4397 this.height = height; 4398 } 4399 4400 /** 4401 * Copy constructor. Clones the width and height values of the source. 4402 * 4403 * @param source The layout params to copy from. 4404 */ 4405 public LayoutParams(LayoutParams source) { 4406 this.width = source.width; 4407 this.height = source.height; 4408 } 4409 4410 /** 4411 * Used internally by MarginLayoutParams. 4412 * @hide 4413 */ 4414 LayoutParams() { 4415 } 4416 4417 /** 4418 * Extracts the layout parameters from the supplied attributes. 4419 * 4420 * @param a the style attributes to extract the parameters from 4421 * @param widthAttr the identifier of the width attribute 4422 * @param heightAttr the identifier of the height attribute 4423 */ 4424 protected void setBaseAttributes(TypedArray a, int widthAttr, int heightAttr) { 4425 width = a.getLayoutDimension(widthAttr, "layout_width"); 4426 height = a.getLayoutDimension(heightAttr, "layout_height"); 4427 } 4428 4429 /** 4430 * Returns a String representation of this set of layout parameters. 4431 * 4432 * @param output the String to prepend to the internal representation 4433 * @return a String with the following format: output + 4434 * "ViewGroup.LayoutParams={ width=WIDTH, height=HEIGHT }" 4435 * 4436 * @hide 4437 */ 4438 public String debug(String output) { 4439 return output + "ViewGroup.LayoutParams={ width=" 4440 + sizeToString(width) + ", height=" + sizeToString(height) + " }"; 4441 } 4442 4443 /** 4444 * Converts the specified size to a readable String. 4445 * 4446 * @param size the size to convert 4447 * @return a String instance representing the supplied size 4448 * 4449 * @hide 4450 */ 4451 protected static String sizeToString(int size) { 4452 if (size == WRAP_CONTENT) { 4453 return "wrap-content"; 4454 } 4455 if (size == MATCH_PARENT) { 4456 return "match-parent"; 4457 } 4458 return String.valueOf(size); 4459 } 4460 } 4461 4462 /** 4463 * Per-child layout information for layouts that support margins. 4464 * See 4465 * {@link android.R.styleable#ViewGroup_MarginLayout ViewGroup Margin Layout Attributes} 4466 * for a list of all child view attributes that this class supports. 4467 */ 4468 public static class MarginLayoutParams extends ViewGroup.LayoutParams { 4469 /** 4470 * The left margin in pixels of the child. 4471 */ 4472 @ViewDebug.ExportedProperty(category = "layout") 4473 public int leftMargin; 4474 4475 /** 4476 * The top margin in pixels of the child. 4477 */ 4478 @ViewDebug.ExportedProperty(category = "layout") 4479 public int topMargin; 4480 4481 /** 4482 * The right margin in pixels of the child. 4483 */ 4484 @ViewDebug.ExportedProperty(category = "layout") 4485 public int rightMargin; 4486 4487 /** 4488 * The bottom margin in pixels of the child. 4489 */ 4490 @ViewDebug.ExportedProperty(category = "layout") 4491 public int bottomMargin; 4492 4493 /** 4494 * Creates a new set of layout parameters. The values are extracted from 4495 * the supplied attributes set and context. 4496 * 4497 * @param c the application environment 4498 * @param attrs the set of attributes from which to extract the layout 4499 * parameters' values 4500 */ 4501 public MarginLayoutParams(Context c, AttributeSet attrs) { 4502 super(); 4503 4504 TypedArray a = c.obtainStyledAttributes(attrs, R.styleable.ViewGroup_MarginLayout); 4505 setBaseAttributes(a, 4506 R.styleable.ViewGroup_MarginLayout_layout_width, 4507 R.styleable.ViewGroup_MarginLayout_layout_height); 4508 4509 int margin = a.getDimensionPixelSize( 4510 com.android.internal.R.styleable.ViewGroup_MarginLayout_layout_margin, -1); 4511 if (margin >= 0) { 4512 leftMargin = margin; 4513 topMargin = margin; 4514 rightMargin= margin; 4515 bottomMargin = margin; 4516 } else { 4517 leftMargin = a.getDimensionPixelSize( 4518 R.styleable.ViewGroup_MarginLayout_layout_marginLeft, 0); 4519 topMargin = a.getDimensionPixelSize( 4520 R.styleable.ViewGroup_MarginLayout_layout_marginTop, 0); 4521 rightMargin = a.getDimensionPixelSize( 4522 R.styleable.ViewGroup_MarginLayout_layout_marginRight, 0); 4523 bottomMargin = a.getDimensionPixelSize( 4524 R.styleable.ViewGroup_MarginLayout_layout_marginBottom, 0); 4525 } 4526 4527 a.recycle(); 4528 } 4529 4530 /** 4531 * {@inheritDoc} 4532 */ 4533 public MarginLayoutParams(int width, int height) { 4534 super(width, height); 4535 } 4536 4537 /** 4538 * Copy constructor. Clones the width, height and margin values of the source. 4539 * 4540 * @param source The layout params to copy from. 4541 */ 4542 public MarginLayoutParams(MarginLayoutParams source) { 4543 this.width = source.width; 4544 this.height = source.height; 4545 4546 this.leftMargin = source.leftMargin; 4547 this.topMargin = source.topMargin; 4548 this.rightMargin = source.rightMargin; 4549 this.bottomMargin = source.bottomMargin; 4550 } 4551 4552 /** 4553 * {@inheritDoc} 4554 */ 4555 public MarginLayoutParams(LayoutParams source) { 4556 super(source); 4557 } 4558 4559 /** 4560 * Sets the margins, in pixels. 4561 * 4562 * @param left the left margin size 4563 * @param top the top margin size 4564 * @param right the right margin size 4565 * @param bottom the bottom margin size 4566 * 4567 * @attr ref android.R.styleable#ViewGroup_MarginLayout_layout_marginLeft 4568 * @attr ref android.R.styleable#ViewGroup_MarginLayout_layout_marginTop 4569 * @attr ref android.R.styleable#ViewGroup_MarginLayout_layout_marginRight 4570 * @attr ref android.R.styleable#ViewGroup_MarginLayout_layout_marginBottom 4571 */ 4572 public void setMargins(int left, int top, int right, int bottom) { 4573 leftMargin = left; 4574 topMargin = top; 4575 rightMargin = right; 4576 bottomMargin = bottom; 4577 } 4578 } 4579 4580 /* Describes a touched view and the ids of the pointers that it has captured. 4581 * 4582 * This code assumes that pointer ids are always in the range 0..31 such that 4583 * it can use a bitfield to track which pointer ids are present. 4584 * As it happens, the lower layers of the input dispatch pipeline also use the 4585 * same trick so the assumption should be safe here... 4586 */ 4587 private static final class TouchTarget { 4588 private static final int MAX_RECYCLED = 32; 4589 private static final Object sRecycleLock = new Object(); 4590 private static TouchTarget sRecycleBin; 4591 private static int sRecycledCount; 4592 4593 public static final int ALL_POINTER_IDS = -1; // all ones 4594 4595 // The touched child view. 4596 public View child; 4597 4598 // The combined bit mask of pointer ids for all pointers captured by the target. 4599 public int pointerIdBits; 4600 4601 // The next target in the target list. 4602 public TouchTarget next; 4603 4604 private TouchTarget() { 4605 } 4606 4607 public static TouchTarget obtain(View child, int pointerIdBits) { 4608 final TouchTarget target; 4609 synchronized (sRecycleLock) { 4610 if (sRecycleBin == null) { 4611 target = new TouchTarget(); 4612 } else { 4613 target = sRecycleBin; 4614 sRecycleBin = target.next; 4615 sRecycledCount--; 4616 target.next = null; 4617 } 4618 } 4619 target.child = child; 4620 target.pointerIdBits = pointerIdBits; 4621 return target; 4622 } 4623 4624 public void recycle() { 4625 synchronized (sRecycleLock) { 4626 if (sRecycledCount < MAX_RECYCLED) { 4627 next = sRecycleBin; 4628 sRecycleBin = this; 4629 sRecycledCount += 1; 4630 } 4631 } 4632 } 4633 } 4634} 4635