ViewGroup.java revision 0d9275e565551eed57297627188aa39f3897a50b
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 final boolean buildCache = !isHardwareAccelerated(); 1871 1872 for (int i = 0; i < count; i++) { 1873 final View child = children[i]; 1874 if ((child.mViewFlags & VISIBILITY_MASK) == VISIBLE) { 1875 child.setDrawingCacheEnabled(true); 1876 if (buildCache) { 1877 child.buildDrawingCache(true); 1878 } 1879 } 1880 } 1881 1882 mGroupFlags |= FLAG_CHILDREN_DRAWN_WITH_CACHE; 1883 } 1884 } 1885 1886 @Override 1887 protected void onAnimationEnd() { 1888 super.onAnimationEnd(); 1889 1890 // When this ViewGroup's animation ends, destroy the cache of the children 1891 if ((mGroupFlags & FLAG_ANIMATION_CACHE) == FLAG_ANIMATION_CACHE) { 1892 mGroupFlags &= ~FLAG_CHILDREN_DRAWN_WITH_CACHE; 1893 1894 if ((mPersistentDrawingCache & PERSISTENT_ANIMATION_CACHE) == 0) { 1895 setChildrenDrawingCacheEnabled(false); 1896 } 1897 } 1898 } 1899 1900 @Override 1901 Bitmap createSnapshot(Bitmap.Config quality, int backgroundColor, boolean skipChildren) { 1902 int count = mChildrenCount; 1903 int[] visibilities = null; 1904 1905 if (skipChildren) { 1906 visibilities = new int[count]; 1907 for (int i = 0; i < count; i++) { 1908 View child = getChildAt(i); 1909 visibilities[i] = child.getVisibility(); 1910 if (visibilities[i] == View.VISIBLE) { 1911 child.setVisibility(INVISIBLE); 1912 } 1913 } 1914 } 1915 1916 Bitmap b = super.createSnapshot(quality, backgroundColor, skipChildren); 1917 1918 if (skipChildren) { 1919 for (int i = 0; i < count; i++) { 1920 getChildAt(i).setVisibility(visibilities[i]); 1921 } 1922 } 1923 1924 return b; 1925 } 1926 1927 /** 1928 * {@inheritDoc} 1929 */ 1930 @Override 1931 protected void dispatchDraw(Canvas canvas) { 1932 final int count = mChildrenCount; 1933 final View[] children = mChildren; 1934 int flags = mGroupFlags; 1935 1936 if ((flags & FLAG_RUN_ANIMATION) != 0 && canAnimate()) { 1937 final boolean cache = (mGroupFlags & FLAG_ANIMATION_CACHE) == FLAG_ANIMATION_CACHE; 1938 1939 final boolean buildCache = !isHardwareAccelerated(); 1940 for (int i = 0; i < count; i++) { 1941 final View child = children[i]; 1942 if ((child.mViewFlags & VISIBILITY_MASK) == VISIBLE) { 1943 final LayoutParams params = child.getLayoutParams(); 1944 attachLayoutAnimationParameters(child, params, i, count); 1945 bindLayoutAnimation(child); 1946 if (cache) { 1947 child.setDrawingCacheEnabled(true); 1948 if (buildCache) { 1949 child.buildDrawingCache(true); 1950 } 1951 } 1952 } 1953 } 1954 1955 final LayoutAnimationController controller = mLayoutAnimationController; 1956 if (controller.willOverlap()) { 1957 mGroupFlags |= FLAG_OPTIMIZE_INVALIDATE; 1958 } 1959 1960 controller.start(); 1961 1962 mGroupFlags &= ~FLAG_RUN_ANIMATION; 1963 mGroupFlags &= ~FLAG_ANIMATION_DONE; 1964 1965 if (cache) { 1966 mGroupFlags |= FLAG_CHILDREN_DRAWN_WITH_CACHE; 1967 } 1968 1969 if (mAnimationListener != null) { 1970 mAnimationListener.onAnimationStart(controller.getAnimation()); 1971 } 1972 } 1973 1974 int saveCount = 0; 1975 final boolean clipToPadding = (flags & CLIP_TO_PADDING_MASK) == CLIP_TO_PADDING_MASK; 1976 if (clipToPadding) { 1977 saveCount = canvas.save(); 1978 canvas.clipRect(mScrollX + mPaddingLeft, mScrollY + mPaddingTop, 1979 mScrollX + mRight - mLeft - mPaddingRight, 1980 mScrollY + mBottom - mTop - mPaddingBottom); 1981 1982 } 1983 1984 // We will draw our child's animation, let's reset the flag 1985 mPrivateFlags &= ~DRAW_ANIMATION; 1986 mGroupFlags &= ~FLAG_INVALIDATE_REQUIRED; 1987 1988 boolean more = false; 1989 final long drawingTime = getDrawingTime(); 1990 1991 if ((flags & FLAG_USE_CHILD_DRAWING_ORDER) == 0) { 1992 for (int i = 0; i < count; i++) { 1993 final View child = children[i]; 1994 if ((child.mViewFlags & VISIBILITY_MASK) == VISIBLE || child.getAnimation() != null) { 1995 more |= drawChild(canvas, child, drawingTime); 1996 } 1997 } 1998 } else { 1999 for (int i = 0; i < count; i++) { 2000 final View child = children[getChildDrawingOrder(count, i)]; 2001 if ((child.mViewFlags & VISIBILITY_MASK) == VISIBLE || child.getAnimation() != null) { 2002 more |= drawChild(canvas, child, drawingTime); 2003 } 2004 } 2005 } 2006 2007 // Draw any disappearing views that have animations 2008 if (mDisappearingChildren != null) { 2009 final ArrayList<View> disappearingChildren = mDisappearingChildren; 2010 final int disappearingCount = disappearingChildren.size() - 1; 2011 // Go backwards -- we may delete as animations finish 2012 for (int i = disappearingCount; i >= 0; i--) { 2013 final View child = disappearingChildren.get(i); 2014 more |= drawChild(canvas, child, drawingTime); 2015 } 2016 } 2017 2018 if (clipToPadding) { 2019 canvas.restoreToCount(saveCount); 2020 } 2021 2022 // mGroupFlags might have been updated by drawChild() 2023 flags = mGroupFlags; 2024 2025 if ((flags & FLAG_INVALIDATE_REQUIRED) == FLAG_INVALIDATE_REQUIRED) { 2026 invalidate(); 2027 } 2028 2029 if ((flags & FLAG_ANIMATION_DONE) == 0 && (flags & FLAG_NOTIFY_ANIMATION_LISTENER) == 0 && 2030 mLayoutAnimationController.isDone() && !more) { 2031 // We want to erase the drawing cache and notify the listener after the 2032 // next frame is drawn because one extra invalidate() is caused by 2033 // drawChild() after the animation is over 2034 mGroupFlags |= FLAG_NOTIFY_ANIMATION_LISTENER; 2035 final Runnable end = new Runnable() { 2036 public void run() { 2037 notifyAnimationListener(); 2038 } 2039 }; 2040 post(end); 2041 } 2042 } 2043 2044 /** 2045 * Returns the index of the child to draw for this iteration. Override this 2046 * if you want to change the drawing order of children. By default, it 2047 * returns i. 2048 * <p> 2049 * NOTE: In order for this method to be called, you must enable child ordering 2050 * first by calling {@link #setChildrenDrawingOrderEnabled(boolean)}. 2051 * 2052 * @param i The current iteration. 2053 * @return The index of the child to draw this iteration. 2054 * 2055 * @see #setChildrenDrawingOrderEnabled(boolean) 2056 * @see #isChildrenDrawingOrderEnabled() 2057 */ 2058 protected int getChildDrawingOrder(int childCount, int i) { 2059 return i; 2060 } 2061 2062 private void notifyAnimationListener() { 2063 mGroupFlags &= ~FLAG_NOTIFY_ANIMATION_LISTENER; 2064 mGroupFlags |= FLAG_ANIMATION_DONE; 2065 2066 if (mAnimationListener != null) { 2067 final Runnable end = new Runnable() { 2068 public void run() { 2069 mAnimationListener.onAnimationEnd(mLayoutAnimationController.getAnimation()); 2070 } 2071 }; 2072 post(end); 2073 } 2074 2075 if ((mGroupFlags & FLAG_ANIMATION_CACHE) == FLAG_ANIMATION_CACHE) { 2076 mGroupFlags &= ~FLAG_CHILDREN_DRAWN_WITH_CACHE; 2077 if ((mPersistentDrawingCache & PERSISTENT_ANIMATION_CACHE) == 0) { 2078 setChildrenDrawingCacheEnabled(false); 2079 } 2080 } 2081 2082 invalidate(); 2083 } 2084 2085 /** 2086 * Draw one child of this View Group. This method is responsible for getting 2087 * the canvas in the right state. This includes clipping, translating so 2088 * that the child's scrolled origin is at 0, 0, and applying any animation 2089 * transformations. 2090 * 2091 * @param canvas The canvas on which to draw the child 2092 * @param child Who to draw 2093 * @param drawingTime The time at which draw is occuring 2094 * @return True if an invalidate() was issued 2095 */ 2096 protected boolean drawChild(Canvas canvas, View child, long drawingTime) { 2097 boolean more = false; 2098 2099 final int cl = child.mLeft; 2100 final int ct = child.mTop; 2101 final int cr = child.mRight; 2102 final int cb = child.mBottom; 2103 2104 final int flags = mGroupFlags; 2105 2106 if ((flags & FLAG_CLEAR_TRANSFORMATION) == FLAG_CLEAR_TRANSFORMATION) { 2107 mChildTransformation.clear(); 2108 mGroupFlags &= ~FLAG_CLEAR_TRANSFORMATION; 2109 } 2110 2111 Transformation transformToApply = null; 2112 Transformation invalidationTransform; 2113 final Animation a = child.getAnimation(); 2114 boolean concatMatrix = false; 2115 2116 boolean scalingRequired = false; 2117 boolean caching = false; 2118 if ((flags & FLAG_CHILDREN_DRAWN_WITH_CACHE) == FLAG_CHILDREN_DRAWN_WITH_CACHE || 2119 (flags & FLAG_ALWAYS_DRAWN_WITH_CACHE) == FLAG_ALWAYS_DRAWN_WITH_CACHE) { 2120 caching = true; 2121 if (mAttachInfo != null) scalingRequired = mAttachInfo.mScalingRequired; 2122 } 2123 2124 if (a != null) { 2125 final boolean initialized = a.isInitialized(); 2126 if (!initialized) { 2127 a.initialize(cr - cl, cb - ct, getWidth(), getHeight()); 2128 a.initializeInvalidateRegion(0, 0, cr - cl, cb - ct); 2129 child.onAnimationStart(); 2130 } 2131 2132 more = a.getTransformation(drawingTime, mChildTransformation, 2133 scalingRequired ? mAttachInfo.mApplicationScale : 1f); 2134 if (scalingRequired && mAttachInfo.mApplicationScale != 1f) { 2135 if (mInvalidationTransformation == null) { 2136 mInvalidationTransformation = new Transformation(); 2137 } 2138 invalidationTransform = mInvalidationTransformation; 2139 a.getTransformation(drawingTime, invalidationTransform, 1f); 2140 } else { 2141 invalidationTransform = mChildTransformation; 2142 } 2143 transformToApply = mChildTransformation; 2144 2145 concatMatrix = a.willChangeTransformationMatrix(); 2146 2147 if (more) { 2148 if (!a.willChangeBounds()) { 2149 if ((flags & (FLAG_OPTIMIZE_INVALIDATE | FLAG_ANIMATION_DONE)) == 2150 FLAG_OPTIMIZE_INVALIDATE) { 2151 mGroupFlags |= FLAG_INVALIDATE_REQUIRED; 2152 } else if ((flags & FLAG_INVALIDATE_REQUIRED) == 0) { 2153 // The child need to draw an animation, potentially offscreen, so 2154 // make sure we do not cancel invalidate requests 2155 mPrivateFlags |= DRAW_ANIMATION; 2156 invalidate(cl, ct, cr, cb); 2157 } 2158 } else { 2159 if (mInvalidateRegion == null) { 2160 mInvalidateRegion = new RectF(); 2161 } 2162 final RectF region = mInvalidateRegion; 2163 a.getInvalidateRegion(0, 0, cr - cl, cb - ct, region, invalidationTransform); 2164 2165 // The child need to draw an animation, potentially offscreen, so 2166 // make sure we do not cancel invalidate requests 2167 mPrivateFlags |= DRAW_ANIMATION; 2168 2169 final int left = cl + (int) region.left; 2170 final int top = ct + (int) region.top; 2171 invalidate(left, top, left + (int) region.width(), top + (int) region.height()); 2172 } 2173 } 2174 } else if ((flags & FLAG_SUPPORT_STATIC_TRANSFORMATIONS) == 2175 FLAG_SUPPORT_STATIC_TRANSFORMATIONS) { 2176 final boolean hasTransform = getChildStaticTransformation(child, mChildTransformation); 2177 if (hasTransform) { 2178 final int transformType = mChildTransformation.getTransformationType(); 2179 transformToApply = transformType != Transformation.TYPE_IDENTITY ? 2180 mChildTransformation : null; 2181 concatMatrix = (transformType & Transformation.TYPE_MATRIX) != 0; 2182 } 2183 } 2184 2185 concatMatrix |= !child.hasIdentityMatrix(); 2186 2187 // Sets the flag as early as possible to allow draw() implementations 2188 // to call invalidate() successfully when doing animations 2189 child.mPrivateFlags |= DRAWN; 2190 2191 if (!concatMatrix && canvas.quickReject(cl, ct, cr, cb, Canvas.EdgeType.BW) && 2192 (child.mPrivateFlags & DRAW_ANIMATION) == 0) { 2193 return more; 2194 } 2195 2196 float alpha = child.getAlpha(); 2197 // Bail out early if the view does not need to be drawn 2198 if (alpha <= ViewConfiguration.ALPHA_THRESHOLD && (child.mPrivateFlags & ALPHA_SET) == 0 && 2199 !(child instanceof SurfaceView)) { 2200 return more; 2201 } 2202 2203 child.computeScroll(); 2204 2205 final int sx = child.mScrollX; 2206 final int sy = child.mScrollY; 2207 2208 DisplayList displayList = null; 2209 Bitmap cache = null; 2210 if (caching) { 2211 if (!canvas.isHardwareAccelerated()) { 2212 cache = child.getDrawingCache(true); 2213 } else { 2214 displayList = child.getDisplayList(); 2215 } 2216 } 2217 2218 final boolean hasDisplayList = displayList != null && displayList.isReady(); 2219 final boolean hasNoCache = cache == null || hasDisplayList; 2220 2221 final int restoreTo = canvas.save(); 2222 if (hasNoCache) { 2223 canvas.translate(cl - sx, ct - sy); 2224 } else { 2225 canvas.translate(cl, ct); 2226 if (scalingRequired) { 2227 // mAttachInfo cannot be null, otherwise scalingRequired == false 2228 final float scale = 1.0f / mAttachInfo.mApplicationScale; 2229 canvas.scale(scale, scale); 2230 } 2231 } 2232 2233 if (transformToApply != null || alpha < 1.0f || !child.hasIdentityMatrix()) { 2234 int transX = 0; 2235 int transY = 0; 2236 2237 if (hasNoCache) { 2238 transX = -sx; 2239 transY = -sy; 2240 } 2241 2242 if (transformToApply != null) { 2243 if (concatMatrix) { 2244 // Undo the scroll translation, apply the transformation matrix, 2245 // then redo the scroll translate to get the correct result. 2246 canvas.translate(-transX, -transY); 2247 canvas.concat(transformToApply.getMatrix()); 2248 canvas.translate(transX, transY); 2249 mGroupFlags |= FLAG_CLEAR_TRANSFORMATION; 2250 } 2251 2252 float transformAlpha = transformToApply.getAlpha(); 2253 if (transformAlpha < 1.0f) { 2254 alpha *= transformToApply.getAlpha(); 2255 mGroupFlags |= FLAG_CLEAR_TRANSFORMATION; 2256 } 2257 } 2258 2259 if (!child.hasIdentityMatrix()) { 2260 canvas.translate(-transX, -transY); 2261 canvas.concat(child.getMatrix()); 2262 canvas.translate(transX, transY); 2263 } 2264 2265 if (alpha < 1.0f) { 2266 mGroupFlags |= FLAG_CLEAR_TRANSFORMATION; 2267 2268 if (hasNoCache) { 2269 final int multipliedAlpha = (int) (255 * alpha); 2270 if (!child.onSetAlpha(multipliedAlpha)) { 2271 int layerFlags = Canvas.HAS_ALPHA_LAYER_SAVE_FLAG; 2272 if ((flags & FLAG_CLIP_CHILDREN) == FLAG_CLIP_CHILDREN) { 2273 layerFlags |= Canvas.CLIP_TO_LAYER_SAVE_FLAG; 2274 } 2275 canvas.saveLayerAlpha(sx, sy, sx + cr - cl, sy + cb - ct, multipliedAlpha, 2276 layerFlags); 2277 } else { 2278 child.mPrivateFlags |= ALPHA_SET; 2279 } 2280 } 2281 } 2282 } else if ((child.mPrivateFlags & ALPHA_SET) == ALPHA_SET) { 2283 child.onSetAlpha(255); 2284 child.mPrivateFlags &= ~ALPHA_SET; 2285 } 2286 2287 if ((flags & FLAG_CLIP_CHILDREN) == FLAG_CLIP_CHILDREN) { 2288 if (hasNoCache) { 2289 canvas.clipRect(sx, sy, sx + (cr - cl), sy + (cb - ct)); 2290 } else { 2291 if (!scalingRequired) { 2292 canvas.clipRect(0, 0, cr - cl, cb - ct); 2293 } else { 2294 canvas.clipRect(0, 0, cache.getWidth(), cache.getHeight()); 2295 } 2296 } 2297 } 2298 2299 if (hasNoCache) { 2300 if (!hasDisplayList) { 2301 // Fast path for layouts with no backgrounds 2302 if ((child.mPrivateFlags & SKIP_DRAW) == SKIP_DRAW) { 2303 if (ViewDebug.TRACE_HIERARCHY) { 2304 ViewDebug.trace(this, ViewDebug.HierarchyTraceType.DRAW); 2305 } 2306 child.mPrivateFlags &= ~DIRTY_MASK; 2307 child.dispatchDraw(canvas); 2308 } else { 2309 child.draw(canvas); 2310 } 2311 } else { 2312 ((HardwareCanvas) canvas).drawDisplayList(displayList); 2313 } 2314 } else if (cache != null) { 2315 final Paint cachePaint = mCachePaint; 2316 if (alpha < 1.0f) { 2317 cachePaint.setAlpha((int) (alpha * 255)); 2318 mGroupFlags |= FLAG_ALPHA_LOWER_THAN_ONE; 2319 } else if ((flags & FLAG_ALPHA_LOWER_THAN_ONE) == FLAG_ALPHA_LOWER_THAN_ONE) { 2320 cachePaint.setAlpha(255); 2321 mGroupFlags &= ~FLAG_ALPHA_LOWER_THAN_ONE; 2322 } 2323 canvas.drawBitmap(cache, 0.0f, 0.0f, cachePaint); 2324 } 2325 2326 canvas.restoreToCount(restoreTo); 2327 2328 if (a != null && !more) { 2329 child.onSetAlpha(255); 2330 finishAnimatingView(child, a); 2331 } 2332 2333 return more; 2334 } 2335 2336 /** 2337 * By default, children are clipped to their bounds before drawing. This 2338 * allows view groups to override this behavior for animations, etc. 2339 * 2340 * @param clipChildren true to clip children to their bounds, 2341 * false otherwise 2342 * @attr ref android.R.styleable#ViewGroup_clipChildren 2343 */ 2344 public void setClipChildren(boolean clipChildren) { 2345 setBooleanFlag(FLAG_CLIP_CHILDREN, clipChildren); 2346 } 2347 2348 /** 2349 * By default, children are clipped to the padding of the ViewGroup. This 2350 * allows view groups to override this behavior 2351 * 2352 * @param clipToPadding true to clip children to the padding of the 2353 * group, false otherwise 2354 * @attr ref android.R.styleable#ViewGroup_clipToPadding 2355 */ 2356 public void setClipToPadding(boolean clipToPadding) { 2357 setBooleanFlag(FLAG_CLIP_TO_PADDING, clipToPadding); 2358 } 2359 2360 /** 2361 * {@inheritDoc} 2362 */ 2363 @Override 2364 public void dispatchSetSelected(boolean selected) { 2365 final View[] children = mChildren; 2366 final int count = mChildrenCount; 2367 for (int i = 0; i < count; i++) { 2368 2369 children[i].setSelected(selected); 2370 } 2371 } 2372 2373 /** 2374 * {@inheritDoc} 2375 */ 2376 @Override 2377 public void dispatchSetActivated(boolean activated) { 2378 final View[] children = mChildren; 2379 final int count = mChildrenCount; 2380 for (int i = 0; i < count; i++) { 2381 2382 children[i].setActivated(activated); 2383 } 2384 } 2385 2386 @Override 2387 protected void dispatchSetPressed(boolean pressed) { 2388 final View[] children = mChildren; 2389 final int count = mChildrenCount; 2390 for (int i = 0; i < count; i++) { 2391 children[i].setPressed(pressed); 2392 } 2393 } 2394 2395 /** 2396 * When this property is set to true, this ViewGroup supports static transformations on 2397 * children; this causes 2398 * {@link #getChildStaticTransformation(View, android.view.animation.Transformation)} to be 2399 * invoked when a child is drawn. 2400 * 2401 * Any subclass overriding 2402 * {@link #getChildStaticTransformation(View, android.view.animation.Transformation)} should 2403 * set this property to true. 2404 * 2405 * @param enabled True to enable static transformations on children, false otherwise. 2406 * 2407 * @see #FLAG_SUPPORT_STATIC_TRANSFORMATIONS 2408 */ 2409 protected void setStaticTransformationsEnabled(boolean enabled) { 2410 setBooleanFlag(FLAG_SUPPORT_STATIC_TRANSFORMATIONS, enabled); 2411 } 2412 2413 /** 2414 * {@inheritDoc} 2415 * 2416 * @see #setStaticTransformationsEnabled(boolean) 2417 */ 2418 protected boolean getChildStaticTransformation(View child, Transformation t) { 2419 return false; 2420 } 2421 2422 /** 2423 * {@hide} 2424 */ 2425 @Override 2426 protected View findViewTraversal(int id) { 2427 if (id == mID) { 2428 return this; 2429 } 2430 2431 final View[] where = mChildren; 2432 final int len = mChildrenCount; 2433 2434 for (int i = 0; i < len; i++) { 2435 View v = where[i]; 2436 2437 if ((v.mPrivateFlags & IS_ROOT_NAMESPACE) == 0) { 2438 v = v.findViewById(id); 2439 2440 if (v != null) { 2441 return v; 2442 } 2443 } 2444 } 2445 2446 return null; 2447 } 2448 2449 /** 2450 * {@hide} 2451 */ 2452 @Override 2453 protected View findViewWithTagTraversal(Object tag) { 2454 if (tag != null && tag.equals(mTag)) { 2455 return this; 2456 } 2457 2458 final View[] where = mChildren; 2459 final int len = mChildrenCount; 2460 2461 for (int i = 0; i < len; i++) { 2462 View v = where[i]; 2463 2464 if ((v.mPrivateFlags & IS_ROOT_NAMESPACE) == 0) { 2465 v = v.findViewWithTag(tag); 2466 2467 if (v != null) { 2468 return v; 2469 } 2470 } 2471 } 2472 2473 return null; 2474 } 2475 2476 /** 2477 * Adds a child view. If no layout parameters are already set on the child, the 2478 * default parameters for this ViewGroup are set on the child. 2479 * 2480 * @param child the child view to add 2481 * 2482 * @see #generateDefaultLayoutParams() 2483 */ 2484 public void addView(View child) { 2485 addView(child, -1); 2486 } 2487 2488 /** 2489 * Adds a child view. If no layout parameters are already set on the child, the 2490 * default parameters for this ViewGroup are set on the child. 2491 * 2492 * @param child the child view to add 2493 * @param index the position at which to add the child 2494 * 2495 * @see #generateDefaultLayoutParams() 2496 */ 2497 public void addView(View child, int index) { 2498 LayoutParams params = child.getLayoutParams(); 2499 if (params == null) { 2500 params = generateDefaultLayoutParams(); 2501 if (params == null) { 2502 throw new IllegalArgumentException("generateDefaultLayoutParams() cannot return null"); 2503 } 2504 } 2505 addView(child, index, params); 2506 } 2507 2508 /** 2509 * Adds a child view with this ViewGroup's default layout parameters and the 2510 * specified width and height. 2511 * 2512 * @param child the child view to add 2513 */ 2514 public void addView(View child, int width, int height) { 2515 final LayoutParams params = generateDefaultLayoutParams(); 2516 params.width = width; 2517 params.height = height; 2518 addView(child, -1, params); 2519 } 2520 2521 /** 2522 * Adds a child view with the specified layout parameters. 2523 * 2524 * @param child the child view to add 2525 * @param params the layout parameters to set on the child 2526 */ 2527 public void addView(View child, LayoutParams params) { 2528 addView(child, -1, params); 2529 } 2530 2531 /** 2532 * Adds a child view with the specified layout parameters. 2533 * 2534 * @param child the child view to add 2535 * @param index the position at which to add the child 2536 * @param params the layout parameters to set on the child 2537 */ 2538 public void addView(View child, int index, LayoutParams params) { 2539 if (DBG) { 2540 System.out.println(this + " addView"); 2541 } 2542 2543 // addViewInner() will call child.requestLayout() when setting the new LayoutParams 2544 // therefore, we call requestLayout() on ourselves before, so that the child's request 2545 // will be blocked at our level 2546 requestLayout(); 2547 invalidate(); 2548 addViewInner(child, index, params, false); 2549 } 2550 2551 /** 2552 * {@inheritDoc} 2553 */ 2554 public void updateViewLayout(View view, ViewGroup.LayoutParams params) { 2555 if (!checkLayoutParams(params)) { 2556 throw new IllegalArgumentException("Invalid LayoutParams supplied to " + this); 2557 } 2558 if (view.mParent != this) { 2559 throw new IllegalArgumentException("Given view not a child of " + this); 2560 } 2561 view.setLayoutParams(params); 2562 } 2563 2564 /** 2565 * {@inheritDoc} 2566 */ 2567 protected boolean checkLayoutParams(ViewGroup.LayoutParams p) { 2568 return p != null; 2569 } 2570 2571 /** 2572 * Interface definition for a callback to be invoked when the hierarchy 2573 * within this view changed. The hierarchy changes whenever a child is added 2574 * to or removed from this view. 2575 */ 2576 public interface OnHierarchyChangeListener { 2577 /** 2578 * Called when a new child is added to a parent view. 2579 * 2580 * @param parent the view in which a child was added 2581 * @param child the new child view added in the hierarchy 2582 */ 2583 void onChildViewAdded(View parent, View child); 2584 2585 /** 2586 * Called when a child is removed from a parent view. 2587 * 2588 * @param parent the view from which the child was removed 2589 * @param child the child removed from the hierarchy 2590 */ 2591 void onChildViewRemoved(View parent, View child); 2592 } 2593 2594 /** 2595 * Register a callback to be invoked when a child is added to or removed 2596 * from this view. 2597 * 2598 * @param listener the callback to invoke on hierarchy change 2599 */ 2600 public void setOnHierarchyChangeListener(OnHierarchyChangeListener listener) { 2601 mOnHierarchyChangeListener = listener; 2602 } 2603 2604 /** 2605 * Adds a view during layout. This is useful if in your onLayout() method, 2606 * you need to add more views (as does the list view for example). 2607 * 2608 * If index is negative, it means put it at the end of the list. 2609 * 2610 * @param child the view to add to the group 2611 * @param index the index at which the child must be added 2612 * @param params the layout parameters to associate with the child 2613 * @return true if the child was added, false otherwise 2614 */ 2615 protected boolean addViewInLayout(View child, int index, LayoutParams params) { 2616 return addViewInLayout(child, index, params, false); 2617 } 2618 2619 /** 2620 * Adds a view during layout. This is useful if in your onLayout() method, 2621 * you need to add more views (as does the list view for example). 2622 * 2623 * If index is negative, it means put it at the end of the list. 2624 * 2625 * @param child the view to add to the group 2626 * @param index the index at which the child must be added 2627 * @param params the layout parameters to associate with the child 2628 * @param preventRequestLayout if true, calling this method will not trigger a 2629 * layout request on child 2630 * @return true if the child was added, false otherwise 2631 */ 2632 protected boolean addViewInLayout(View child, int index, LayoutParams params, 2633 boolean preventRequestLayout) { 2634 child.mParent = null; 2635 addViewInner(child, index, params, preventRequestLayout); 2636 child.mPrivateFlags = (child.mPrivateFlags & ~DIRTY_MASK) | DRAWN; 2637 return true; 2638 } 2639 2640 /** 2641 * Prevents the specified child to be laid out during the next layout pass. 2642 * 2643 * @param child the child on which to perform the cleanup 2644 */ 2645 protected void cleanupLayoutState(View child) { 2646 child.mPrivateFlags &= ~View.FORCE_LAYOUT; 2647 } 2648 2649 private void addViewInner(View child, int index, LayoutParams params, 2650 boolean preventRequestLayout) { 2651 2652 if (child.getParent() != null) { 2653 throw new IllegalStateException("The specified child already has a parent. " + 2654 "You must call removeView() on the child's parent first."); 2655 } 2656 2657 if (mTransition != null) { 2658 mTransition.addChild(this, child); 2659 } 2660 2661 if (!checkLayoutParams(params)) { 2662 params = generateLayoutParams(params); 2663 } 2664 2665 if (preventRequestLayout) { 2666 child.mLayoutParams = params; 2667 } else { 2668 child.setLayoutParams(params); 2669 } 2670 2671 if (index < 0) { 2672 index = mChildrenCount; 2673 } 2674 2675 addInArray(child, index); 2676 2677 // tell our children 2678 if (preventRequestLayout) { 2679 child.assignParent(this); 2680 } else { 2681 child.mParent = this; 2682 } 2683 2684 if (child.hasFocus()) { 2685 requestChildFocus(child, child.findFocus()); 2686 } 2687 2688 AttachInfo ai = mAttachInfo; 2689 if (ai != null) { 2690 boolean lastKeepOn = ai.mKeepScreenOn; 2691 ai.mKeepScreenOn = false; 2692 child.dispatchAttachedToWindow(mAttachInfo, (mViewFlags&VISIBILITY_MASK)); 2693 if (ai.mKeepScreenOn) { 2694 needGlobalAttributesUpdate(true); 2695 } 2696 ai.mKeepScreenOn = lastKeepOn; 2697 } 2698 2699 if (mOnHierarchyChangeListener != null) { 2700 mOnHierarchyChangeListener.onChildViewAdded(this, child); 2701 } 2702 2703 if ((child.mViewFlags & DUPLICATE_PARENT_STATE) == DUPLICATE_PARENT_STATE) { 2704 mGroupFlags |= FLAG_NOTIFY_CHILDREN_ON_DRAWABLE_STATE_CHANGE; 2705 } 2706 } 2707 2708 private void addInArray(View child, int index) { 2709 View[] children = mChildren; 2710 final int count = mChildrenCount; 2711 final int size = children.length; 2712 if (index == count) { 2713 if (size == count) { 2714 mChildren = new View[size + ARRAY_CAPACITY_INCREMENT]; 2715 System.arraycopy(children, 0, mChildren, 0, size); 2716 children = mChildren; 2717 } 2718 children[mChildrenCount++] = child; 2719 } else if (index < count) { 2720 if (size == count) { 2721 mChildren = new View[size + ARRAY_CAPACITY_INCREMENT]; 2722 System.arraycopy(children, 0, mChildren, 0, index); 2723 System.arraycopy(children, index, mChildren, index + 1, count - index); 2724 children = mChildren; 2725 } else { 2726 System.arraycopy(children, index, children, index + 1, count - index); 2727 } 2728 children[index] = child; 2729 mChildrenCount++; 2730 } else { 2731 throw new IndexOutOfBoundsException("index=" + index + " count=" + count); 2732 } 2733 } 2734 2735 // This method also sets the child's mParent to null 2736 private void removeFromArray(int index) { 2737 final View[] children = mChildren; 2738 if (!(mTransitioningViews != null && mTransitioningViews.contains(children[index]))) { 2739 children[index].mParent = null; 2740 } 2741 final int count = mChildrenCount; 2742 if (index == count - 1) { 2743 children[--mChildrenCount] = null; 2744 } else if (index >= 0 && index < count) { 2745 System.arraycopy(children, index + 1, children, index, count - index - 1); 2746 children[--mChildrenCount] = null; 2747 } else { 2748 throw new IndexOutOfBoundsException(); 2749 } 2750 } 2751 2752 // This method also sets the children's mParent to null 2753 private void removeFromArray(int start, int count) { 2754 final View[] children = mChildren; 2755 final int childrenCount = mChildrenCount; 2756 2757 start = Math.max(0, start); 2758 final int end = Math.min(childrenCount, start + count); 2759 2760 if (start == end) { 2761 return; 2762 } 2763 2764 if (end == childrenCount) { 2765 for (int i = start; i < end; i++) { 2766 children[i].mParent = null; 2767 children[i] = null; 2768 } 2769 } else { 2770 for (int i = start; i < end; i++) { 2771 children[i].mParent = null; 2772 } 2773 2774 // Since we're looping above, we might as well do the copy, but is arraycopy() 2775 // faster than the extra 2 bounds checks we would do in the loop? 2776 System.arraycopy(children, end, children, start, childrenCount - end); 2777 2778 for (int i = childrenCount - (end - start); i < childrenCount; i++) { 2779 children[i] = null; 2780 } 2781 } 2782 2783 mChildrenCount -= (end - start); 2784 } 2785 2786 private void bindLayoutAnimation(View child) { 2787 Animation a = mLayoutAnimationController.getAnimationForView(child); 2788 child.setAnimation(a); 2789 } 2790 2791 /** 2792 * Subclasses should override this method to set layout animation 2793 * parameters on the supplied child. 2794 * 2795 * @param child the child to associate with animation parameters 2796 * @param params the child's layout parameters which hold the animation 2797 * parameters 2798 * @param index the index of the child in the view group 2799 * @param count the number of children in the view group 2800 */ 2801 protected void attachLayoutAnimationParameters(View child, 2802 LayoutParams params, int index, int count) { 2803 LayoutAnimationController.AnimationParameters animationParams = 2804 params.layoutAnimationParameters; 2805 if (animationParams == null) { 2806 animationParams = new LayoutAnimationController.AnimationParameters(); 2807 params.layoutAnimationParameters = animationParams; 2808 } 2809 2810 animationParams.count = count; 2811 animationParams.index = index; 2812 } 2813 2814 /** 2815 * {@inheritDoc} 2816 */ 2817 public void removeView(View view) { 2818 removeViewInternal(view); 2819 requestLayout(); 2820 invalidate(); 2821 } 2822 2823 /** 2824 * Removes a view during layout. This is useful if in your onLayout() method, 2825 * you need to remove more views. 2826 * 2827 * @param view the view to remove from the group 2828 */ 2829 public void removeViewInLayout(View view) { 2830 removeViewInternal(view); 2831 } 2832 2833 /** 2834 * Removes a range of views during layout. This is useful if in your onLayout() method, 2835 * you need to remove more views. 2836 * 2837 * @param start the index of the first view to remove from the group 2838 * @param count the number of views to remove from the group 2839 */ 2840 public void removeViewsInLayout(int start, int count) { 2841 removeViewsInternal(start, count); 2842 } 2843 2844 /** 2845 * Removes the view at the specified position in the group. 2846 * 2847 * @param index the position in the group of the view to remove 2848 */ 2849 public void removeViewAt(int index) { 2850 removeViewInternal(index, getChildAt(index)); 2851 requestLayout(); 2852 invalidate(); 2853 } 2854 2855 /** 2856 * Removes the specified range of views from the group. 2857 * 2858 * @param start the first position in the group of the range of views to remove 2859 * @param count the number of views to remove 2860 */ 2861 public void removeViews(int start, int count) { 2862 removeViewsInternal(start, count); 2863 requestLayout(); 2864 invalidate(); 2865 } 2866 2867 private void removeViewInternal(View view) { 2868 final int index = indexOfChild(view); 2869 if (index >= 0) { 2870 removeViewInternal(index, view); 2871 } 2872 } 2873 2874 private void removeViewInternal(int index, View view) { 2875 2876 if (mTransition != null) { 2877 mTransition.removeChild(this, view); 2878 } 2879 2880 boolean clearChildFocus = false; 2881 if (view == mFocused) { 2882 view.clearFocusForRemoval(); 2883 clearChildFocus = true; 2884 } 2885 2886 if (view.getAnimation() != null || 2887 (mTransitioningViews != null && mTransitioningViews.contains(view))) { 2888 addDisappearingView(view); 2889 } else if (view.mAttachInfo != null) { 2890 view.dispatchDetachedFromWindow(); 2891 } 2892 2893 if (mOnHierarchyChangeListener != null) { 2894 mOnHierarchyChangeListener.onChildViewRemoved(this, view); 2895 } 2896 2897 needGlobalAttributesUpdate(false); 2898 2899 removeFromArray(index); 2900 2901 if (clearChildFocus) { 2902 clearChildFocus(view); 2903 } 2904 } 2905 2906 /** 2907 * Sets the LayoutTransition object for this ViewGroup. If the LayoutTransition object is 2908 * not null, changes in layout which occur because of children being added to or removed from 2909 * the ViewGroup will be animated according to the animations defined in that LayoutTransition 2910 * object. By default, the transition object is null (so layout changes are not animated). 2911 * 2912 * @param transition The LayoutTransition object that will animated changes in layout. A value 2913 * of <code>null</code> means no transition will run on layout changes. 2914 * @attr ref android.R.styleable#ViewGroup_animateLayoutChanges 2915 */ 2916 public void setLayoutTransition(LayoutTransition transition) { 2917 if (mTransition != null) { 2918 mTransition.removeTransitionListener(mLayoutTransitionListener); 2919 } 2920 mTransition = transition; 2921 if (mTransition != null) { 2922 mTransition.addTransitionListener(mLayoutTransitionListener); 2923 } 2924 } 2925 2926 /** 2927 * Gets the LayoutTransition object for this ViewGroup. If the LayoutTransition object is 2928 * not null, changes in layout which occur because of children being added to or removed from 2929 * the ViewGroup will be animated according to the animations defined in that LayoutTransition 2930 * object. By default, the transition object is null (so layout changes are not animated). 2931 * 2932 * @return LayoutTranstion The LayoutTransition object that will animated changes in layout. 2933 * A value of <code>null</code> means no transition will run on layout changes. 2934 */ 2935 public LayoutTransition getLayoutTransition() { 2936 return mTransition; 2937 } 2938 2939 private void removeViewsInternal(int start, int count) { 2940 final OnHierarchyChangeListener onHierarchyChangeListener = mOnHierarchyChangeListener; 2941 final boolean notifyListener = onHierarchyChangeListener != null; 2942 final View focused = mFocused; 2943 final boolean detach = mAttachInfo != null; 2944 View clearChildFocus = null; 2945 2946 final View[] children = mChildren; 2947 final int end = start + count; 2948 2949 for (int i = start; i < end; i++) { 2950 final View view = children[i]; 2951 2952 if (mTransition != null) { 2953 mTransition.removeChild(this, view); 2954 } 2955 2956 if (view == focused) { 2957 view.clearFocusForRemoval(); 2958 clearChildFocus = view; 2959 } 2960 2961 if (view.getAnimation() != null || 2962 (mTransitioningViews != null && mTransitioningViews.contains(view))) { 2963 addDisappearingView(view); 2964 } else if (detach) { 2965 view.dispatchDetachedFromWindow(); 2966 } 2967 2968 needGlobalAttributesUpdate(false); 2969 2970 if (notifyListener) { 2971 onHierarchyChangeListener.onChildViewRemoved(this, view); 2972 } 2973 } 2974 2975 removeFromArray(start, count); 2976 2977 if (clearChildFocus != null) { 2978 clearChildFocus(clearChildFocus); 2979 } 2980 } 2981 2982 /** 2983 * Call this method to remove all child views from the 2984 * ViewGroup. 2985 */ 2986 public void removeAllViews() { 2987 removeAllViewsInLayout(); 2988 requestLayout(); 2989 invalidate(); 2990 } 2991 2992 /** 2993 * Called by a ViewGroup subclass to remove child views from itself, 2994 * when it must first know its size on screen before it can calculate how many 2995 * child views it will render. An example is a Gallery or a ListView, which 2996 * may "have" 50 children, but actually only render the number of children 2997 * that can currently fit inside the object on screen. Do not call 2998 * this method unless you are extending ViewGroup and understand the 2999 * view measuring and layout pipeline. 3000 */ 3001 public void removeAllViewsInLayout() { 3002 final int count = mChildrenCount; 3003 if (count <= 0) { 3004 return; 3005 } 3006 3007 final View[] children = mChildren; 3008 mChildrenCount = 0; 3009 3010 final OnHierarchyChangeListener listener = mOnHierarchyChangeListener; 3011 final boolean notify = listener != null; 3012 final View focused = mFocused; 3013 final boolean detach = mAttachInfo != null; 3014 View clearChildFocus = null; 3015 3016 needGlobalAttributesUpdate(false); 3017 3018 for (int i = count - 1; i >= 0; i--) { 3019 final View view = children[i]; 3020 3021 if (mTransition != null) { 3022 mTransition.removeChild(this, view); 3023 } 3024 3025 if (view == focused) { 3026 view.clearFocusForRemoval(); 3027 clearChildFocus = view; 3028 } 3029 3030 if (view.getAnimation() != null || 3031 (mTransitioningViews != null && mTransitioningViews.contains(view))) { 3032 addDisappearingView(view); 3033 } else if (detach) { 3034 view.dispatchDetachedFromWindow(); 3035 } 3036 3037 if (notify) { 3038 listener.onChildViewRemoved(this, view); 3039 } 3040 3041 view.mParent = null; 3042 children[i] = null; 3043 } 3044 3045 if (clearChildFocus != null) { 3046 clearChildFocus(clearChildFocus); 3047 } 3048 } 3049 3050 /** 3051 * Finishes the removal of a detached view. This method will dispatch the detached from 3052 * window event and notify the hierarchy change listener. 3053 * 3054 * @param child the child to be definitely removed from the view hierarchy 3055 * @param animate if true and the view has an animation, the view is placed in the 3056 * disappearing views list, otherwise, it is detached from the window 3057 * 3058 * @see #attachViewToParent(View, int, android.view.ViewGroup.LayoutParams) 3059 * @see #detachAllViewsFromParent() 3060 * @see #detachViewFromParent(View) 3061 * @see #detachViewFromParent(int) 3062 */ 3063 protected void removeDetachedView(View child, boolean animate) { 3064 if (mTransition != null) { 3065 mTransition.removeChild(this, child); 3066 } 3067 3068 if (child == mFocused) { 3069 child.clearFocus(); 3070 } 3071 3072 if ((animate && child.getAnimation() != null) || 3073 (mTransitioningViews != null && mTransitioningViews.contains(child))) { 3074 addDisappearingView(child); 3075 } else if (child.mAttachInfo != null) { 3076 child.dispatchDetachedFromWindow(); 3077 } 3078 3079 if (mOnHierarchyChangeListener != null) { 3080 mOnHierarchyChangeListener.onChildViewRemoved(this, child); 3081 } 3082 } 3083 3084 /** 3085 * Attaches a view to this view group. Attaching a view assigns this group as the parent, 3086 * sets the layout parameters and puts the view in the list of children so it can be retrieved 3087 * by calling {@link #getChildAt(int)}. 3088 * 3089 * This method should be called only for view which were detached from their parent. 3090 * 3091 * @param child the child to attach 3092 * @param index the index at which the child should be attached 3093 * @param params the layout parameters of the child 3094 * 3095 * @see #removeDetachedView(View, boolean) 3096 * @see #detachAllViewsFromParent() 3097 * @see #detachViewFromParent(View) 3098 * @see #detachViewFromParent(int) 3099 */ 3100 protected void attachViewToParent(View child, int index, LayoutParams params) { 3101 child.mLayoutParams = params; 3102 3103 if (index < 0) { 3104 index = mChildrenCount; 3105 } 3106 3107 addInArray(child, index); 3108 3109 child.mParent = this; 3110 child.mPrivateFlags = (child.mPrivateFlags & ~DIRTY_MASK & ~DRAWING_CACHE_VALID) | DRAWN; 3111 3112 if (child.hasFocus()) { 3113 requestChildFocus(child, child.findFocus()); 3114 } 3115 } 3116 3117 /** 3118 * Detaches a view from its parent. Detaching a view should be temporary and followed 3119 * either by a call to {@link #attachViewToParent(View, int, android.view.ViewGroup.LayoutParams)} 3120 * or a call to {@link #removeDetachedView(View, boolean)}. When a view is detached, 3121 * its parent is null and cannot be retrieved by a call to {@link #getChildAt(int)}. 3122 * 3123 * @param child the child to detach 3124 * 3125 * @see #detachViewFromParent(int) 3126 * @see #detachViewsFromParent(int, int) 3127 * @see #detachAllViewsFromParent() 3128 * @see #attachViewToParent(View, int, android.view.ViewGroup.LayoutParams) 3129 * @see #removeDetachedView(View, boolean) 3130 */ 3131 protected void detachViewFromParent(View child) { 3132 removeFromArray(indexOfChild(child)); 3133 } 3134 3135 /** 3136 * Detaches a view from its parent. Detaching a view should be temporary and followed 3137 * either by a call to {@link #attachViewToParent(View, int, android.view.ViewGroup.LayoutParams)} 3138 * or a call to {@link #removeDetachedView(View, boolean)}. When a view is detached, 3139 * its parent is null and cannot be retrieved by a call to {@link #getChildAt(int)}. 3140 * 3141 * @param index the index of the child to detach 3142 * 3143 * @see #detachViewFromParent(View) 3144 * @see #detachAllViewsFromParent() 3145 * @see #detachViewsFromParent(int, int) 3146 * @see #attachViewToParent(View, int, android.view.ViewGroup.LayoutParams) 3147 * @see #removeDetachedView(View, boolean) 3148 */ 3149 protected void detachViewFromParent(int index) { 3150 removeFromArray(index); 3151 } 3152 3153 /** 3154 * Detaches a range of view from their parent. Detaching a view should be temporary and followed 3155 * either by a call to {@link #attachViewToParent(View, int, android.view.ViewGroup.LayoutParams)} 3156 * or a call to {@link #removeDetachedView(View, boolean)}. When a view is detached, its 3157 * parent is null and cannot be retrieved by a call to {@link #getChildAt(int)}. 3158 * 3159 * @param start the first index of the childrend range to detach 3160 * @param count the number of children to detach 3161 * 3162 * @see #detachViewFromParent(View) 3163 * @see #detachViewFromParent(int) 3164 * @see #detachAllViewsFromParent() 3165 * @see #attachViewToParent(View, int, android.view.ViewGroup.LayoutParams) 3166 * @see #removeDetachedView(View, boolean) 3167 */ 3168 protected void detachViewsFromParent(int start, int count) { 3169 removeFromArray(start, count); 3170 } 3171 3172 /** 3173 * Detaches all views from the parent. Detaching a view should be temporary and followed 3174 * either by a call to {@link #attachViewToParent(View, int, android.view.ViewGroup.LayoutParams)} 3175 * or a call to {@link #removeDetachedView(View, boolean)}. When a view is detached, 3176 * its parent is null and cannot be retrieved by a call to {@link #getChildAt(int)}. 3177 * 3178 * @see #detachViewFromParent(View) 3179 * @see #detachViewFromParent(int) 3180 * @see #detachViewsFromParent(int, int) 3181 * @see #attachViewToParent(View, int, android.view.ViewGroup.LayoutParams) 3182 * @see #removeDetachedView(View, boolean) 3183 */ 3184 protected void detachAllViewsFromParent() { 3185 final int count = mChildrenCount; 3186 if (count <= 0) { 3187 return; 3188 } 3189 3190 final View[] children = mChildren; 3191 mChildrenCount = 0; 3192 3193 for (int i = count - 1; i >= 0; i--) { 3194 children[i].mParent = null; 3195 children[i] = null; 3196 } 3197 } 3198 3199 /** 3200 * Don't call or override this method. It is used for the implementation of 3201 * the view hierarchy. 3202 */ 3203 public final void invalidateChild(View child, final Rect dirty) { 3204 if (ViewDebug.TRACE_HIERARCHY) { 3205 ViewDebug.trace(this, ViewDebug.HierarchyTraceType.INVALIDATE_CHILD); 3206 } 3207 3208 ViewParent parent = this; 3209 3210 final AttachInfo attachInfo = mAttachInfo; 3211 if (attachInfo != null) { 3212 final int[] location = attachInfo.mInvalidateChildLocation; 3213 location[CHILD_LEFT_INDEX] = child.mLeft; 3214 location[CHILD_TOP_INDEX] = child.mTop; 3215 Matrix childMatrix = child.getMatrix(); 3216 if (!childMatrix.isIdentity()) { 3217 RectF boundingRect = attachInfo.mTmpTransformRect; 3218 boundingRect.set(dirty); 3219 childMatrix.mapRect(boundingRect); 3220 dirty.set((int) boundingRect.left, (int) boundingRect.top, 3221 (int) (boundingRect.right + 0.5f), 3222 (int) (boundingRect.bottom + 0.5f)); 3223 } 3224 3225 // If the child is drawing an animation, we want to copy this flag onto 3226 // ourselves and the parent to make sure the invalidate request goes 3227 // through 3228 final boolean drawAnimation = (child.mPrivateFlags & DRAW_ANIMATION) == DRAW_ANIMATION; 3229 3230 // Check whether the child that requests the invalidate is fully opaque 3231 final boolean isOpaque = child.isOpaque() && !drawAnimation && 3232 child.getAnimation() != null; 3233 // Mark the child as dirty, using the appropriate flag 3234 // Make sure we do not set both flags at the same time 3235 final int opaqueFlag = isOpaque ? DIRTY_OPAQUE : DIRTY; 3236 3237 do { 3238 View view = null; 3239 if (parent instanceof View) { 3240 view = (View) parent; 3241 } 3242 3243 if (drawAnimation) { 3244 if (view != null) { 3245 view.mPrivateFlags |= DRAW_ANIMATION; 3246 } else if (parent instanceof ViewRoot) { 3247 ((ViewRoot) parent).mIsAnimating = true; 3248 } 3249 } 3250 3251 // If the parent is dirty opaque or not dirty, mark it dirty with the opaque 3252 // flag coming from the child that initiated the invalidate 3253 if (view != null && (view.mPrivateFlags & DIRTY_MASK) != DIRTY) { 3254 view.mPrivateFlags = (view.mPrivateFlags & ~DIRTY_MASK) | opaqueFlag; 3255 } 3256 3257 parent = parent.invalidateChildInParent(location, dirty); 3258 if (view != null) { 3259 // Account for transform on current parent 3260 Matrix m = view.getMatrix(); 3261 if (!m.isIdentity()) { 3262 RectF boundingRect = attachInfo.mTmpTransformRect; 3263 boundingRect.set(dirty); 3264 m.mapRect(boundingRect); 3265 dirty.set((int) boundingRect.left, (int) boundingRect.top, 3266 (int) (boundingRect.right + 0.5f), 3267 (int) (boundingRect.bottom + 0.5f)); 3268 } 3269 } 3270 } while (parent != null); 3271 } 3272 } 3273 3274 /** 3275 * Don't call or override this method. It is used for the implementation of 3276 * the view hierarchy. 3277 * 3278 * This implementation returns null if this ViewGroup does not have a parent, 3279 * if this ViewGroup is already fully invalidated or if the dirty rectangle 3280 * does not intersect with this ViewGroup's bounds. 3281 */ 3282 public ViewParent invalidateChildInParent(final int[] location, final Rect dirty) { 3283 if (ViewDebug.TRACE_HIERARCHY) { 3284 ViewDebug.trace(this, ViewDebug.HierarchyTraceType.INVALIDATE_CHILD_IN_PARENT); 3285 } 3286 3287 if ((mPrivateFlags & DRAWN) == DRAWN) { 3288 if ((mGroupFlags & (FLAG_OPTIMIZE_INVALIDATE | FLAG_ANIMATION_DONE)) != 3289 FLAG_OPTIMIZE_INVALIDATE) { 3290 dirty.offset(location[CHILD_LEFT_INDEX] - mScrollX, 3291 location[CHILD_TOP_INDEX] - mScrollY); 3292 3293 final int left = mLeft; 3294 final int top = mTop; 3295 3296 if (dirty.intersect(0, 0, mRight - left, mBottom - top) || 3297 (mPrivateFlags & DRAW_ANIMATION) == DRAW_ANIMATION) { 3298 mPrivateFlags &= ~DRAWING_CACHE_VALID; 3299 3300 location[CHILD_LEFT_INDEX] = left; 3301 location[CHILD_TOP_INDEX] = top; 3302 3303 return mParent; 3304 } 3305 } else { 3306 mPrivateFlags &= ~DRAWN & ~DRAWING_CACHE_VALID; 3307 3308 location[CHILD_LEFT_INDEX] = mLeft; 3309 location[CHILD_TOP_INDEX] = mTop; 3310 3311 dirty.set(0, 0, mRight - location[CHILD_LEFT_INDEX], 3312 mBottom - location[CHILD_TOP_INDEX]); 3313 3314 return mParent; 3315 } 3316 } 3317 3318 return null; 3319 } 3320 3321 /** 3322 * Offset a rectangle that is in a descendant's coordinate 3323 * space into our coordinate space. 3324 * @param descendant A descendant of this view 3325 * @param rect A rectangle defined in descendant's coordinate space. 3326 */ 3327 public final void offsetDescendantRectToMyCoords(View descendant, Rect rect) { 3328 offsetRectBetweenParentAndChild(descendant, rect, true, false); 3329 } 3330 3331 /** 3332 * Offset a rectangle that is in our coordinate space into an ancestor's 3333 * coordinate space. 3334 * @param descendant A descendant of this view 3335 * @param rect A rectangle defined in descendant's coordinate space. 3336 */ 3337 public final void offsetRectIntoDescendantCoords(View descendant, Rect rect) { 3338 offsetRectBetweenParentAndChild(descendant, rect, false, false); 3339 } 3340 3341 /** 3342 * Helper method that offsets a rect either from parent to descendant or 3343 * descendant to parent. 3344 */ 3345 void offsetRectBetweenParentAndChild(View descendant, Rect rect, 3346 boolean offsetFromChildToParent, boolean clipToBounds) { 3347 3348 // already in the same coord system :) 3349 if (descendant == this) { 3350 return; 3351 } 3352 3353 ViewParent theParent = descendant.mParent; 3354 3355 // search and offset up to the parent 3356 while ((theParent != null) 3357 && (theParent instanceof View) 3358 && (theParent != this)) { 3359 3360 if (offsetFromChildToParent) { 3361 rect.offset(descendant.mLeft - descendant.mScrollX, 3362 descendant.mTop - descendant.mScrollY); 3363 if (clipToBounds) { 3364 View p = (View) theParent; 3365 rect.intersect(0, 0, p.mRight - p.mLeft, p.mBottom - p.mTop); 3366 } 3367 } else { 3368 if (clipToBounds) { 3369 View p = (View) theParent; 3370 rect.intersect(0, 0, p.mRight - p.mLeft, p.mBottom - p.mTop); 3371 } 3372 rect.offset(descendant.mScrollX - descendant.mLeft, 3373 descendant.mScrollY - descendant.mTop); 3374 } 3375 3376 descendant = (View) theParent; 3377 theParent = descendant.mParent; 3378 } 3379 3380 // now that we are up to this view, need to offset one more time 3381 // to get into our coordinate space 3382 if (theParent == this) { 3383 if (offsetFromChildToParent) { 3384 rect.offset(descendant.mLeft - descendant.mScrollX, 3385 descendant.mTop - descendant.mScrollY); 3386 } else { 3387 rect.offset(descendant.mScrollX - descendant.mLeft, 3388 descendant.mScrollY - descendant.mTop); 3389 } 3390 } else { 3391 throw new IllegalArgumentException("parameter must be a descendant of this view"); 3392 } 3393 } 3394 3395 /** 3396 * Offset the vertical location of all children of this view by the specified number of pixels. 3397 * 3398 * @param offset the number of pixels to offset 3399 * 3400 * @hide 3401 */ 3402 public void offsetChildrenTopAndBottom(int offset) { 3403 final int count = mChildrenCount; 3404 final View[] children = mChildren; 3405 3406 for (int i = 0; i < count; i++) { 3407 final View v = children[i]; 3408 v.mTop += offset; 3409 v.mBottom += offset; 3410 } 3411 } 3412 3413 /** 3414 * {@inheritDoc} 3415 */ 3416 public boolean getChildVisibleRect(View child, Rect r, android.graphics.Point offset) { 3417 int dx = child.mLeft - mScrollX; 3418 int dy = child.mTop - mScrollY; 3419 if (offset != null) { 3420 offset.x += dx; 3421 offset.y += dy; 3422 } 3423 r.offset(dx, dy); 3424 return r.intersect(0, 0, mRight - mLeft, mBottom - mTop) && 3425 (mParent == null || mParent.getChildVisibleRect(this, r, offset)); 3426 } 3427 3428 /** 3429 * {@inheritDoc} 3430 */ 3431 @Override 3432 protected abstract void onLayout(boolean changed, 3433 int l, int t, int r, int b); 3434 3435 /** 3436 * Indicates whether the view group has the ability to animate its children 3437 * after the first layout. 3438 * 3439 * @return true if the children can be animated, false otherwise 3440 */ 3441 protected boolean canAnimate() { 3442 return mLayoutAnimationController != null; 3443 } 3444 3445 /** 3446 * Runs the layout animation. Calling this method triggers a relayout of 3447 * this view group. 3448 */ 3449 public void startLayoutAnimation() { 3450 if (mLayoutAnimationController != null) { 3451 mGroupFlags |= FLAG_RUN_ANIMATION; 3452 requestLayout(); 3453 } 3454 } 3455 3456 /** 3457 * Schedules the layout animation to be played after the next layout pass 3458 * of this view group. This can be used to restart the layout animation 3459 * when the content of the view group changes or when the activity is 3460 * paused and resumed. 3461 */ 3462 public void scheduleLayoutAnimation() { 3463 mGroupFlags |= FLAG_RUN_ANIMATION; 3464 } 3465 3466 /** 3467 * Sets the layout animation controller used to animate the group's 3468 * children after the first layout. 3469 * 3470 * @param controller the animation controller 3471 */ 3472 public void setLayoutAnimation(LayoutAnimationController controller) { 3473 mLayoutAnimationController = controller; 3474 if (mLayoutAnimationController != null) { 3475 mGroupFlags |= FLAG_RUN_ANIMATION; 3476 } 3477 } 3478 3479 /** 3480 * Returns the layout animation controller used to animate the group's 3481 * children. 3482 * 3483 * @return the current animation controller 3484 */ 3485 public LayoutAnimationController getLayoutAnimation() { 3486 return mLayoutAnimationController; 3487 } 3488 3489 /** 3490 * Indicates whether the children's drawing cache is used during a layout 3491 * animation. By default, the drawing cache is enabled but this will prevent 3492 * nested layout animations from working. To nest animations, you must disable 3493 * the cache. 3494 * 3495 * @return true if the animation cache is enabled, false otherwise 3496 * 3497 * @see #setAnimationCacheEnabled(boolean) 3498 * @see View#setDrawingCacheEnabled(boolean) 3499 */ 3500 @ViewDebug.ExportedProperty 3501 public boolean isAnimationCacheEnabled() { 3502 return (mGroupFlags & FLAG_ANIMATION_CACHE) == FLAG_ANIMATION_CACHE; 3503 } 3504 3505 /** 3506 * Enables or disables the children's drawing cache during a layout animation. 3507 * By default, the drawing cache is enabled but this will prevent nested 3508 * layout animations from working. To nest animations, you must disable the 3509 * cache. 3510 * 3511 * @param enabled true to enable the animation cache, false otherwise 3512 * 3513 * @see #isAnimationCacheEnabled() 3514 * @see View#setDrawingCacheEnabled(boolean) 3515 */ 3516 public void setAnimationCacheEnabled(boolean enabled) { 3517 setBooleanFlag(FLAG_ANIMATION_CACHE, enabled); 3518 } 3519 3520 /** 3521 * Indicates whether this ViewGroup will always try to draw its children using their 3522 * drawing cache. By default this property is enabled. 3523 * 3524 * @return true if the animation cache is enabled, false otherwise 3525 * 3526 * @see #setAlwaysDrawnWithCacheEnabled(boolean) 3527 * @see #setChildrenDrawnWithCacheEnabled(boolean) 3528 * @see View#setDrawingCacheEnabled(boolean) 3529 */ 3530 @ViewDebug.ExportedProperty(category = "drawing") 3531 public boolean isAlwaysDrawnWithCacheEnabled() { 3532 return (mGroupFlags & FLAG_ALWAYS_DRAWN_WITH_CACHE) == FLAG_ALWAYS_DRAWN_WITH_CACHE; 3533 } 3534 3535 /** 3536 * Indicates whether this ViewGroup will always try to draw its children using their 3537 * drawing cache. This property can be set to true when the cache rendering is 3538 * slightly different from the children's normal rendering. Renderings can be different, 3539 * for instance, when the cache's quality is set to low. 3540 * 3541 * When this property is disabled, the ViewGroup will use the drawing cache of its 3542 * children only when asked to. It's usually the task of subclasses to tell ViewGroup 3543 * when to start using the drawing cache and when to stop using it. 3544 * 3545 * @param always true to always draw with the drawing cache, false otherwise 3546 * 3547 * @see #isAlwaysDrawnWithCacheEnabled() 3548 * @see #setChildrenDrawnWithCacheEnabled(boolean) 3549 * @see View#setDrawingCacheEnabled(boolean) 3550 * @see View#setDrawingCacheQuality(int) 3551 */ 3552 public void setAlwaysDrawnWithCacheEnabled(boolean always) { 3553 setBooleanFlag(FLAG_ALWAYS_DRAWN_WITH_CACHE, always); 3554 } 3555 3556 /** 3557 * Indicates whether the ViewGroup is currently drawing its children using 3558 * their drawing cache. 3559 * 3560 * @return true if children should be drawn with their cache, false otherwise 3561 * 3562 * @see #setAlwaysDrawnWithCacheEnabled(boolean) 3563 * @see #setChildrenDrawnWithCacheEnabled(boolean) 3564 */ 3565 @ViewDebug.ExportedProperty(category = "drawing") 3566 protected boolean isChildrenDrawnWithCacheEnabled() { 3567 return (mGroupFlags & FLAG_CHILDREN_DRAWN_WITH_CACHE) == FLAG_CHILDREN_DRAWN_WITH_CACHE; 3568 } 3569 3570 /** 3571 * Tells the ViewGroup to draw its children using their drawing cache. This property 3572 * is ignored when {@link #isAlwaysDrawnWithCacheEnabled()} is true. A child's drawing cache 3573 * will be used only if it has been enabled. 3574 * 3575 * Subclasses should call this method to start and stop using the drawing cache when 3576 * they perform performance sensitive operations, like scrolling or animating. 3577 * 3578 * @param enabled true if children should be drawn with their cache, false otherwise 3579 * 3580 * @see #setAlwaysDrawnWithCacheEnabled(boolean) 3581 * @see #isChildrenDrawnWithCacheEnabled() 3582 */ 3583 protected void setChildrenDrawnWithCacheEnabled(boolean enabled) { 3584 setBooleanFlag(FLAG_CHILDREN_DRAWN_WITH_CACHE, enabled); 3585 } 3586 3587 /** 3588 * Indicates whether the ViewGroup is drawing its children in the order defined by 3589 * {@link #getChildDrawingOrder(int, int)}. 3590 * 3591 * @return true if children drawing order is defined by {@link #getChildDrawingOrder(int, int)}, 3592 * false otherwise 3593 * 3594 * @see #setChildrenDrawingOrderEnabled(boolean) 3595 * @see #getChildDrawingOrder(int, int) 3596 */ 3597 @ViewDebug.ExportedProperty(category = "drawing") 3598 protected boolean isChildrenDrawingOrderEnabled() { 3599 return (mGroupFlags & FLAG_USE_CHILD_DRAWING_ORDER) == FLAG_USE_CHILD_DRAWING_ORDER; 3600 } 3601 3602 /** 3603 * Tells the ViewGroup whether to draw its children in the order defined by the method 3604 * {@link #getChildDrawingOrder(int, int)}. 3605 * 3606 * @param enabled true if the order of the children when drawing is determined by 3607 * {@link #getChildDrawingOrder(int, int)}, false otherwise 3608 * 3609 * @see #isChildrenDrawingOrderEnabled() 3610 * @see #getChildDrawingOrder(int, int) 3611 */ 3612 protected void setChildrenDrawingOrderEnabled(boolean enabled) { 3613 setBooleanFlag(FLAG_USE_CHILD_DRAWING_ORDER, enabled); 3614 } 3615 3616 private void setBooleanFlag(int flag, boolean value) { 3617 if (value) { 3618 mGroupFlags |= flag; 3619 } else { 3620 mGroupFlags &= ~flag; 3621 } 3622 } 3623 3624 /** 3625 * Returns an integer indicating what types of drawing caches are kept in memory. 3626 * 3627 * @see #setPersistentDrawingCache(int) 3628 * @see #setAnimationCacheEnabled(boolean) 3629 * 3630 * @return one or a combination of {@link #PERSISTENT_NO_CACHE}, 3631 * {@link #PERSISTENT_ANIMATION_CACHE}, {@link #PERSISTENT_SCROLLING_CACHE} 3632 * and {@link #PERSISTENT_ALL_CACHES} 3633 */ 3634 @ViewDebug.ExportedProperty(category = "drawing", mapping = { 3635 @ViewDebug.IntToString(from = PERSISTENT_NO_CACHE, to = "NONE"), 3636 @ViewDebug.IntToString(from = PERSISTENT_ANIMATION_CACHE, to = "ANIMATION"), 3637 @ViewDebug.IntToString(from = PERSISTENT_SCROLLING_CACHE, to = "SCROLLING"), 3638 @ViewDebug.IntToString(from = PERSISTENT_ALL_CACHES, to = "ALL") 3639 }) 3640 public int getPersistentDrawingCache() { 3641 return mPersistentDrawingCache; 3642 } 3643 3644 /** 3645 * Indicates what types of drawing caches should be kept in memory after 3646 * they have been created. 3647 * 3648 * @see #getPersistentDrawingCache() 3649 * @see #setAnimationCacheEnabled(boolean) 3650 * 3651 * @param drawingCacheToKeep one or a combination of {@link #PERSISTENT_NO_CACHE}, 3652 * {@link #PERSISTENT_ANIMATION_CACHE}, {@link #PERSISTENT_SCROLLING_CACHE} 3653 * and {@link #PERSISTENT_ALL_CACHES} 3654 */ 3655 public void setPersistentDrawingCache(int drawingCacheToKeep) { 3656 mPersistentDrawingCache = drawingCacheToKeep & PERSISTENT_ALL_CACHES; 3657 } 3658 3659 /** 3660 * Returns a new set of layout parameters based on the supplied attributes set. 3661 * 3662 * @param attrs the attributes to build the layout parameters from 3663 * 3664 * @return an instance of {@link android.view.ViewGroup.LayoutParams} or one 3665 * of its descendants 3666 */ 3667 public LayoutParams generateLayoutParams(AttributeSet attrs) { 3668 return new LayoutParams(getContext(), attrs); 3669 } 3670 3671 /** 3672 * Returns a safe set of layout parameters based on the supplied layout params. 3673 * When a ViewGroup is passed a View whose layout params do not pass the test of 3674 * {@link #checkLayoutParams(android.view.ViewGroup.LayoutParams)}, this method 3675 * is invoked. This method should return a new set of layout params suitable for 3676 * this ViewGroup, possibly by copying the appropriate attributes from the 3677 * specified set of layout params. 3678 * 3679 * @param p The layout parameters to convert into a suitable set of layout parameters 3680 * for this ViewGroup. 3681 * 3682 * @return an instance of {@link android.view.ViewGroup.LayoutParams} or one 3683 * of its descendants 3684 */ 3685 protected LayoutParams generateLayoutParams(ViewGroup.LayoutParams p) { 3686 return p; 3687 } 3688 3689 /** 3690 * Returns a set of default layout parameters. These parameters are requested 3691 * when the View passed to {@link #addView(View)} has no layout parameters 3692 * already set. If null is returned, an exception is thrown from addView. 3693 * 3694 * @return a set of default layout parameters or null 3695 */ 3696 protected LayoutParams generateDefaultLayoutParams() { 3697 return new LayoutParams(LayoutParams.WRAP_CONTENT, LayoutParams.WRAP_CONTENT); 3698 } 3699 3700 /** 3701 * @hide 3702 */ 3703 @Override 3704 protected boolean dispatchConsistencyCheck(int consistency) { 3705 boolean result = super.dispatchConsistencyCheck(consistency); 3706 3707 final int count = mChildrenCount; 3708 final View[] children = mChildren; 3709 for (int i = 0; i < count; i++) { 3710 if (!children[i].dispatchConsistencyCheck(consistency)) result = false; 3711 } 3712 3713 return result; 3714 } 3715 3716 /** 3717 * @hide 3718 */ 3719 @Override 3720 protected boolean onConsistencyCheck(int consistency) { 3721 boolean result = super.onConsistencyCheck(consistency); 3722 3723 final boolean checkLayout = (consistency & ViewDebug.CONSISTENCY_LAYOUT) != 0; 3724 final boolean checkDrawing = (consistency & ViewDebug.CONSISTENCY_DRAWING) != 0; 3725 3726 if (checkLayout) { 3727 final int count = mChildrenCount; 3728 final View[] children = mChildren; 3729 for (int i = 0; i < count; i++) { 3730 if (children[i].getParent() != this) { 3731 result = false; 3732 android.util.Log.d(ViewDebug.CONSISTENCY_LOG_TAG, 3733 "View " + children[i] + " has no parent/a parent that is not " + this); 3734 } 3735 } 3736 } 3737 3738 if (checkDrawing) { 3739 // If this group is dirty, check that the parent is dirty as well 3740 if ((mPrivateFlags & DIRTY_MASK) != 0) { 3741 final ViewParent parent = getParent(); 3742 if (parent != null && !(parent instanceof ViewRoot)) { 3743 if ((((View) parent).mPrivateFlags & DIRTY_MASK) == 0) { 3744 result = false; 3745 android.util.Log.d(ViewDebug.CONSISTENCY_LOG_TAG, 3746 "ViewGroup " + this + " is dirty but its parent is not: " + this); 3747 } 3748 } 3749 } 3750 } 3751 3752 return result; 3753 } 3754 3755 /** 3756 * {@inheritDoc} 3757 */ 3758 @Override 3759 protected void debug(int depth) { 3760 super.debug(depth); 3761 String output; 3762 3763 if (mFocused != null) { 3764 output = debugIndent(depth); 3765 output += "mFocused"; 3766 Log.d(VIEW_LOG_TAG, output); 3767 } 3768 if (mChildrenCount != 0) { 3769 output = debugIndent(depth); 3770 output += "{"; 3771 Log.d(VIEW_LOG_TAG, output); 3772 } 3773 int count = mChildrenCount; 3774 for (int i = 0; i < count; i++) { 3775 View child = mChildren[i]; 3776 child.debug(depth + 1); 3777 } 3778 3779 if (mChildrenCount != 0) { 3780 output = debugIndent(depth); 3781 output += "}"; 3782 Log.d(VIEW_LOG_TAG, output); 3783 } 3784 } 3785 3786 /** 3787 * Returns the position in the group of the specified child view. 3788 * 3789 * @param child the view for which to get the position 3790 * @return a positive integer representing the position of the view in the 3791 * group, or -1 if the view does not exist in the group 3792 */ 3793 public int indexOfChild(View child) { 3794 final int count = mChildrenCount; 3795 final View[] children = mChildren; 3796 for (int i = 0; i < count; i++) { 3797 if (children[i] == child) { 3798 return i; 3799 } 3800 } 3801 return -1; 3802 } 3803 3804 /** 3805 * Returns the number of children in the group. 3806 * 3807 * @return a positive integer representing the number of children in 3808 * the group 3809 */ 3810 public int getChildCount() { 3811 return mChildrenCount; 3812 } 3813 3814 /** 3815 * Returns the view at the specified position in the group. 3816 * 3817 * @param index the position at which to get the view from 3818 * @return the view at the specified position or null if the position 3819 * does not exist within the group 3820 */ 3821 public View getChildAt(int index) { 3822 try { 3823 return mChildren[index]; 3824 } catch (IndexOutOfBoundsException ex) { 3825 return null; 3826 } 3827 } 3828 3829 /** 3830 * Ask all of the children of this view to measure themselves, taking into 3831 * account both the MeasureSpec requirements for this view and its padding. 3832 * We skip children that are in the GONE state The heavy lifting is done in 3833 * getChildMeasureSpec. 3834 * 3835 * @param widthMeasureSpec The width requirements for this view 3836 * @param heightMeasureSpec The height requirements for this view 3837 */ 3838 protected void measureChildren(int widthMeasureSpec, int heightMeasureSpec) { 3839 final int size = mChildrenCount; 3840 final View[] children = mChildren; 3841 for (int i = 0; i < size; ++i) { 3842 final View child = children[i]; 3843 if ((child.mViewFlags & VISIBILITY_MASK) != GONE) { 3844 measureChild(child, widthMeasureSpec, heightMeasureSpec); 3845 } 3846 } 3847 } 3848 3849 /** 3850 * Ask one of the children of this view to measure itself, taking into 3851 * account both the MeasureSpec requirements for this view and its padding. 3852 * The heavy lifting is done in getChildMeasureSpec. 3853 * 3854 * @param child The child to measure 3855 * @param parentWidthMeasureSpec The width requirements for this view 3856 * @param parentHeightMeasureSpec The height requirements for this view 3857 */ 3858 protected void measureChild(View child, int parentWidthMeasureSpec, 3859 int parentHeightMeasureSpec) { 3860 final LayoutParams lp = child.getLayoutParams(); 3861 3862 final int childWidthMeasureSpec = getChildMeasureSpec(parentWidthMeasureSpec, 3863 mPaddingLeft + mPaddingRight, lp.width); 3864 final int childHeightMeasureSpec = getChildMeasureSpec(parentHeightMeasureSpec, 3865 mPaddingTop + mPaddingBottom, lp.height); 3866 3867 child.measure(childWidthMeasureSpec, childHeightMeasureSpec); 3868 } 3869 3870 /** 3871 * Ask one of the children of this view to measure itself, taking into 3872 * account both the MeasureSpec requirements for this view and its padding 3873 * and margins. The child must have MarginLayoutParams The heavy lifting is 3874 * done in getChildMeasureSpec. 3875 * 3876 * @param child The child to measure 3877 * @param parentWidthMeasureSpec The width requirements for this view 3878 * @param widthUsed Extra space that has been used up by the parent 3879 * horizontally (possibly by other children of the parent) 3880 * @param parentHeightMeasureSpec The height requirements for this view 3881 * @param heightUsed Extra space that has been used up by the parent 3882 * vertically (possibly by other children of the parent) 3883 */ 3884 protected void measureChildWithMargins(View child, 3885 int parentWidthMeasureSpec, int widthUsed, 3886 int parentHeightMeasureSpec, int heightUsed) { 3887 final MarginLayoutParams lp = (MarginLayoutParams) child.getLayoutParams(); 3888 3889 final int childWidthMeasureSpec = getChildMeasureSpec(parentWidthMeasureSpec, 3890 mPaddingLeft + mPaddingRight + lp.leftMargin + lp.rightMargin 3891 + widthUsed, lp.width); 3892 final int childHeightMeasureSpec = getChildMeasureSpec(parentHeightMeasureSpec, 3893 mPaddingTop + mPaddingBottom + lp.topMargin + lp.bottomMargin 3894 + heightUsed, lp.height); 3895 3896 child.measure(childWidthMeasureSpec, childHeightMeasureSpec); 3897 } 3898 3899 /** 3900 * Does the hard part of measureChildren: figuring out the MeasureSpec to 3901 * pass to a particular child. This method figures out the right MeasureSpec 3902 * for one dimension (height or width) of one child view. 3903 * 3904 * The goal is to combine information from our MeasureSpec with the 3905 * LayoutParams of the child to get the best possible results. For example, 3906 * if the this view knows its size (because its MeasureSpec has a mode of 3907 * EXACTLY), and the child has indicated in its LayoutParams that it wants 3908 * to be the same size as the parent, the parent should ask the child to 3909 * layout given an exact size. 3910 * 3911 * @param spec The requirements for this view 3912 * @param padding The padding of this view for the current dimension and 3913 * margins, if applicable 3914 * @param childDimension How big the child wants to be in the current 3915 * dimension 3916 * @return a MeasureSpec integer for the child 3917 */ 3918 public static int getChildMeasureSpec(int spec, int padding, int childDimension) { 3919 int specMode = MeasureSpec.getMode(spec); 3920 int specSize = MeasureSpec.getSize(spec); 3921 3922 int size = Math.max(0, specSize - padding); 3923 3924 int resultSize = 0; 3925 int resultMode = 0; 3926 3927 switch (specMode) { 3928 // Parent has imposed an exact size on us 3929 case MeasureSpec.EXACTLY: 3930 if (childDimension >= 0) { 3931 resultSize = childDimension; 3932 resultMode = MeasureSpec.EXACTLY; 3933 } else if (childDimension == LayoutParams.MATCH_PARENT) { 3934 // Child wants to be our size. So be it. 3935 resultSize = size; 3936 resultMode = MeasureSpec.EXACTLY; 3937 } else if (childDimension == LayoutParams.WRAP_CONTENT) { 3938 // Child wants to determine its own size. It can't be 3939 // bigger than us. 3940 resultSize = size; 3941 resultMode = MeasureSpec.AT_MOST; 3942 } 3943 break; 3944 3945 // Parent has imposed a maximum size on us 3946 case MeasureSpec.AT_MOST: 3947 if (childDimension >= 0) { 3948 // Child wants a specific size... so be it 3949 resultSize = childDimension; 3950 resultMode = MeasureSpec.EXACTLY; 3951 } else if (childDimension == LayoutParams.MATCH_PARENT) { 3952 // Child wants to be our size, but our size is not fixed. 3953 // Constrain child to not be bigger than us. 3954 resultSize = size; 3955 resultMode = MeasureSpec.AT_MOST; 3956 } else if (childDimension == LayoutParams.WRAP_CONTENT) { 3957 // Child wants to determine its own size. It can't be 3958 // bigger than us. 3959 resultSize = size; 3960 resultMode = MeasureSpec.AT_MOST; 3961 } 3962 break; 3963 3964 // Parent asked to see how big we want to be 3965 case MeasureSpec.UNSPECIFIED: 3966 if (childDimension >= 0) { 3967 // Child wants a specific size... let him have it 3968 resultSize = childDimension; 3969 resultMode = MeasureSpec.EXACTLY; 3970 } else if (childDimension == LayoutParams.MATCH_PARENT) { 3971 // Child wants to be our size... find out how big it should 3972 // be 3973 resultSize = 0; 3974 resultMode = MeasureSpec.UNSPECIFIED; 3975 } else if (childDimension == LayoutParams.WRAP_CONTENT) { 3976 // Child wants to determine its own size.... find out how 3977 // big it should be 3978 resultSize = 0; 3979 resultMode = MeasureSpec.UNSPECIFIED; 3980 } 3981 break; 3982 } 3983 return MeasureSpec.makeMeasureSpec(resultSize, resultMode); 3984 } 3985 3986 3987 /** 3988 * Removes any pending animations for views that have been removed. Call 3989 * this if you don't want animations for exiting views to stack up. 3990 */ 3991 public void clearDisappearingChildren() { 3992 if (mDisappearingChildren != null) { 3993 mDisappearingChildren.clear(); 3994 } 3995 } 3996 3997 /** 3998 * Add a view which is removed from mChildren but still needs animation 3999 * 4000 * @param v View to add 4001 */ 4002 private void addDisappearingView(View v) { 4003 ArrayList<View> disappearingChildren = mDisappearingChildren; 4004 4005 if (disappearingChildren == null) { 4006 disappearingChildren = mDisappearingChildren = new ArrayList<View>(); 4007 } 4008 4009 disappearingChildren.add(v); 4010 } 4011 4012 /** 4013 * Cleanup a view when its animation is done. This may mean removing it from 4014 * the list of disappearing views. 4015 * 4016 * @param view The view whose animation has finished 4017 * @param animation The animation, cannot be null 4018 */ 4019 private void finishAnimatingView(final View view, Animation animation) { 4020 final ArrayList<View> disappearingChildren = mDisappearingChildren; 4021 if (disappearingChildren != null) { 4022 if (disappearingChildren.contains(view)) { 4023 disappearingChildren.remove(view); 4024 4025 if (view.mAttachInfo != null) { 4026 view.dispatchDetachedFromWindow(); 4027 } 4028 4029 view.clearAnimation(); 4030 mGroupFlags |= FLAG_INVALIDATE_REQUIRED; 4031 } 4032 } 4033 4034 if (animation != null && !animation.getFillAfter()) { 4035 view.clearAnimation(); 4036 } 4037 4038 if ((view.mPrivateFlags & ANIMATION_STARTED) == ANIMATION_STARTED) { 4039 view.onAnimationEnd(); 4040 // Should be performed by onAnimationEnd() but this avoid an infinite loop, 4041 // so we'd rather be safe than sorry 4042 view.mPrivateFlags &= ~ANIMATION_STARTED; 4043 // Draw one more frame after the animation is done 4044 mGroupFlags |= FLAG_INVALIDATE_REQUIRED; 4045 } 4046 } 4047 4048 /** 4049 * This method tells the ViewGroup that the given View object, which should have this 4050 * ViewGroup as its parent, 4051 * should be kept around (re-displayed when the ViewGroup draws its children) even if it 4052 * is removed from its parent. This allows animations, such as those used by 4053 * {@link android.app.Fragment} and {@link android.animation.LayoutTransition} to animate 4054 * the removal of views. A call to this method should always be accompanied by a later call 4055 * to {@link #endViewTransition(View)}, such as after an animation on the View has finished, 4056 * so that the View finally gets removed. 4057 * 4058 * @param view The View object to be kept visible even if it gets removed from its parent. 4059 */ 4060 public void startViewTransition(View view) { 4061 if (view.mParent == this) { 4062 if (mTransitioningViews == null) { 4063 mTransitioningViews = new ArrayList<View>(); 4064 } 4065 mTransitioningViews.add(view); 4066 } 4067 } 4068 4069 /** 4070 * This method should always be called following an earlier call to 4071 * {@link #startViewTransition(View)}. The given View is finally removed from its parent 4072 * and will no longer be displayed. Note that this method does not perform the functionality 4073 * of removing a view from its parent; it just discontinues the display of a View that 4074 * has previously been removed. 4075 * 4076 * @return view The View object that has been removed but is being kept around in the visible 4077 * hierarchy by an earlier call to {@link #startViewTransition(View)}. 4078 */ 4079 public void endViewTransition(View view) { 4080 if (mTransitioningViews != null) { 4081 mTransitioningViews.remove(view); 4082 final ArrayList<View> disappearingChildren = mDisappearingChildren; 4083 if (disappearingChildren != null && disappearingChildren.contains(view)) { 4084 disappearingChildren.remove(view); 4085 if (mVisibilityChangingChildren != null && 4086 mVisibilityChangingChildren.contains(view)) { 4087 mVisibilityChangingChildren.remove(view); 4088 } else { 4089 if (view.mAttachInfo != null) { 4090 view.dispatchDetachedFromWindow(); 4091 } 4092 if (view.mParent != null) { 4093 view.mParent = null; 4094 } 4095 } 4096 mGroupFlags |= FLAG_INVALIDATE_REQUIRED; 4097 } 4098 } 4099 } 4100 4101 private LayoutTransition.TransitionListener mLayoutTransitionListener = 4102 new LayoutTransition.TransitionListener() { 4103 @Override 4104 public void startTransition(LayoutTransition transition, ViewGroup container, 4105 View view, int transitionType) { 4106 // We only care about disappearing items, since we need special logic to keep 4107 // those items visible after they've been 'removed' 4108 if (transitionType == LayoutTransition.DISAPPEARING) { 4109 startViewTransition(view); 4110 } 4111 } 4112 4113 @Override 4114 public void endTransition(LayoutTransition transition, ViewGroup container, 4115 View view, int transitionType) { 4116 if (transitionType == LayoutTransition.DISAPPEARING && mTransitioningViews != null) { 4117 endViewTransition(view); 4118 } 4119 } 4120 }; 4121 4122 /** 4123 * {@inheritDoc} 4124 */ 4125 @Override 4126 public boolean gatherTransparentRegion(Region region) { 4127 // If no transparent regions requested, we are always opaque. 4128 final boolean meOpaque = (mPrivateFlags & View.REQUEST_TRANSPARENT_REGIONS) == 0; 4129 if (meOpaque && region == null) { 4130 // The caller doesn't care about the region, so stop now. 4131 return true; 4132 } 4133 super.gatherTransparentRegion(region); 4134 final View[] children = mChildren; 4135 final int count = mChildrenCount; 4136 boolean noneOfTheChildrenAreTransparent = true; 4137 for (int i = 0; i < count; i++) { 4138 final View child = children[i]; 4139 if ((child.mViewFlags & VISIBILITY_MASK) != GONE || child.getAnimation() != null) { 4140 if (!child.gatherTransparentRegion(region)) { 4141 noneOfTheChildrenAreTransparent = false; 4142 } 4143 } 4144 } 4145 return meOpaque || noneOfTheChildrenAreTransparent; 4146 } 4147 4148 /** 4149 * {@inheritDoc} 4150 */ 4151 public void requestTransparentRegion(View child) { 4152 if (child != null) { 4153 child.mPrivateFlags |= View.REQUEST_TRANSPARENT_REGIONS; 4154 if (mParent != null) { 4155 mParent.requestTransparentRegion(this); 4156 } 4157 } 4158 } 4159 4160 4161 @Override 4162 protected boolean fitSystemWindows(Rect insets) { 4163 boolean done = super.fitSystemWindows(insets); 4164 if (!done) { 4165 final int count = mChildrenCount; 4166 final View[] children = mChildren; 4167 for (int i = 0; i < count; i++) { 4168 done = children[i].fitSystemWindows(insets); 4169 if (done) { 4170 break; 4171 } 4172 } 4173 } 4174 return done; 4175 } 4176 4177 /** 4178 * Returns the animation listener to which layout animation events are 4179 * sent. 4180 * 4181 * @return an {@link android.view.animation.Animation.AnimationListener} 4182 */ 4183 public Animation.AnimationListener getLayoutAnimationListener() { 4184 return mAnimationListener; 4185 } 4186 4187 @Override 4188 protected void drawableStateChanged() { 4189 super.drawableStateChanged(); 4190 4191 if ((mGroupFlags & FLAG_NOTIFY_CHILDREN_ON_DRAWABLE_STATE_CHANGE) != 0) { 4192 if ((mGroupFlags & FLAG_ADD_STATES_FROM_CHILDREN) != 0) { 4193 throw new IllegalStateException("addStateFromChildren cannot be enabled if a" 4194 + " child has duplicateParentState set to true"); 4195 } 4196 4197 final View[] children = mChildren; 4198 final int count = mChildrenCount; 4199 4200 for (int i = 0; i < count; i++) { 4201 final View child = children[i]; 4202 if ((child.mViewFlags & DUPLICATE_PARENT_STATE) != 0) { 4203 child.refreshDrawableState(); 4204 } 4205 } 4206 } 4207 } 4208 4209 @Override 4210 protected int[] onCreateDrawableState(int extraSpace) { 4211 if ((mGroupFlags & FLAG_ADD_STATES_FROM_CHILDREN) == 0) { 4212 return super.onCreateDrawableState(extraSpace); 4213 } 4214 4215 int need = 0; 4216 int n = getChildCount(); 4217 for (int i = 0; i < n; i++) { 4218 int[] childState = getChildAt(i).getDrawableState(); 4219 4220 if (childState != null) { 4221 need += childState.length; 4222 } 4223 } 4224 4225 int[] state = super.onCreateDrawableState(extraSpace + need); 4226 4227 for (int i = 0; i < n; i++) { 4228 int[] childState = getChildAt(i).getDrawableState(); 4229 4230 if (childState != null) { 4231 state = mergeDrawableStates(state, childState); 4232 } 4233 } 4234 4235 return state; 4236 } 4237 4238 /** 4239 * Sets whether this ViewGroup's drawable states also include 4240 * its children's drawable states. This is used, for example, to 4241 * make a group appear to be focused when its child EditText or button 4242 * is focused. 4243 */ 4244 public void setAddStatesFromChildren(boolean addsStates) { 4245 if (addsStates) { 4246 mGroupFlags |= FLAG_ADD_STATES_FROM_CHILDREN; 4247 } else { 4248 mGroupFlags &= ~FLAG_ADD_STATES_FROM_CHILDREN; 4249 } 4250 4251 refreshDrawableState(); 4252 } 4253 4254 /** 4255 * Returns whether this ViewGroup's drawable states also include 4256 * its children's drawable states. This is used, for example, to 4257 * make a group appear to be focused when its child EditText or button 4258 * is focused. 4259 */ 4260 public boolean addStatesFromChildren() { 4261 return (mGroupFlags & FLAG_ADD_STATES_FROM_CHILDREN) != 0; 4262 } 4263 4264 /** 4265 * If {link #addStatesFromChildren} is true, refreshes this group's 4266 * drawable state (to include the states from its children). 4267 */ 4268 public void childDrawableStateChanged(View child) { 4269 if ((mGroupFlags & FLAG_ADD_STATES_FROM_CHILDREN) != 0) { 4270 refreshDrawableState(); 4271 } 4272 } 4273 4274 /** 4275 * Specifies the animation listener to which layout animation events must 4276 * be sent. Only 4277 * {@link android.view.animation.Animation.AnimationListener#onAnimationStart(Animation)} 4278 * and 4279 * {@link android.view.animation.Animation.AnimationListener#onAnimationEnd(Animation)} 4280 * are invoked. 4281 * 4282 * @param animationListener the layout animation listener 4283 */ 4284 public void setLayoutAnimationListener(Animation.AnimationListener animationListener) { 4285 mAnimationListener = animationListener; 4286 } 4287 4288 /** 4289 * LayoutParams are used by views to tell their parents how they want to be 4290 * laid out. See 4291 * {@link android.R.styleable#ViewGroup_Layout ViewGroup Layout Attributes} 4292 * for a list of all child view attributes that this class supports. 4293 * 4294 * <p> 4295 * The base LayoutParams class just describes how big the view wants to be 4296 * for both width and height. For each dimension, it can specify one of: 4297 * <ul> 4298 * <li>FILL_PARENT (renamed MATCH_PARENT in API Level 8 and higher), which 4299 * means that the view wants to be as big as its parent (minus padding) 4300 * <li> WRAP_CONTENT, which means that the view wants to be just big enough 4301 * to enclose its content (plus padding) 4302 * <li> an exact number 4303 * </ul> 4304 * There are subclasses of LayoutParams for different subclasses of 4305 * ViewGroup. For example, AbsoluteLayout has its own subclass of 4306 * LayoutParams which adds an X and Y value. 4307 * 4308 * @attr ref android.R.styleable#ViewGroup_Layout_layout_height 4309 * @attr ref android.R.styleable#ViewGroup_Layout_layout_width 4310 */ 4311 public static class LayoutParams { 4312 /** 4313 * Special value for the height or width requested by a View. 4314 * FILL_PARENT means that the view wants to be as big as its parent, 4315 * minus the parent's padding, if any. This value is deprecated 4316 * starting in API Level 8 and replaced by {@link #MATCH_PARENT}. 4317 */ 4318 @SuppressWarnings({"UnusedDeclaration"}) 4319 @Deprecated 4320 public static final int FILL_PARENT = -1; 4321 4322 /** 4323 * Special value for the height or width requested by a View. 4324 * MATCH_PARENT means that the view wants to be as big as its parent, 4325 * minus the parent's padding, if any. Introduced in API Level 8. 4326 */ 4327 public static final int MATCH_PARENT = -1; 4328 4329 /** 4330 * Special value for the height or width requested by a View. 4331 * WRAP_CONTENT means that the view wants to be just large enough to fit 4332 * its own internal content, taking its own padding into account. 4333 */ 4334 public static final int WRAP_CONTENT = -2; 4335 4336 /** 4337 * Information about how wide the view wants to be. Can be one of the 4338 * constants FILL_PARENT (replaced by MATCH_PARENT , 4339 * in API Level 8) or WRAP_CONTENT. or an exact size. 4340 */ 4341 @ViewDebug.ExportedProperty(category = "layout", mapping = { 4342 @ViewDebug.IntToString(from = MATCH_PARENT, to = "MATCH_PARENT"), 4343 @ViewDebug.IntToString(from = WRAP_CONTENT, to = "WRAP_CONTENT") 4344 }) 4345 public int width; 4346 4347 /** 4348 * Information about how tall the view wants to be. Can be one of the 4349 * constants FILL_PARENT (replaced by MATCH_PARENT , 4350 * in API Level 8) or WRAP_CONTENT. or an exact size. 4351 */ 4352 @ViewDebug.ExportedProperty(category = "layout", mapping = { 4353 @ViewDebug.IntToString(from = MATCH_PARENT, to = "MATCH_PARENT"), 4354 @ViewDebug.IntToString(from = WRAP_CONTENT, to = "WRAP_CONTENT") 4355 }) 4356 public int height; 4357 4358 /** 4359 * Used to animate layouts. 4360 */ 4361 public LayoutAnimationController.AnimationParameters layoutAnimationParameters; 4362 4363 /** 4364 * Creates a new set of layout parameters. The values are extracted from 4365 * the supplied attributes set and context. The XML attributes mapped 4366 * to this set of layout parameters are: 4367 * 4368 * <ul> 4369 * <li><code>layout_width</code>: the width, either an exact value, 4370 * {@link #WRAP_CONTENT}, or {@link #FILL_PARENT} (replaced by 4371 * {@link #MATCH_PARENT} in API Level 8)</li> 4372 * <li><code>layout_height</code>: the height, either an exact value, 4373 * {@link #WRAP_CONTENT}, or {@link #FILL_PARENT} (replaced by 4374 * {@link #MATCH_PARENT} in API Level 8)</li> 4375 * </ul> 4376 * 4377 * @param c the application environment 4378 * @param attrs the set of attributes from which to extract the layout 4379 * parameters' values 4380 */ 4381 public LayoutParams(Context c, AttributeSet attrs) { 4382 TypedArray a = c.obtainStyledAttributes(attrs, R.styleable.ViewGroup_Layout); 4383 setBaseAttributes(a, 4384 R.styleable.ViewGroup_Layout_layout_width, 4385 R.styleable.ViewGroup_Layout_layout_height); 4386 a.recycle(); 4387 } 4388 4389 /** 4390 * Creates a new set of layout parameters with the specified width 4391 * and height. 4392 * 4393 * @param width the width, either {@link #WRAP_CONTENT}, 4394 * {@link #FILL_PARENT} (replaced by {@link #MATCH_PARENT} in 4395 * API Level 8), or a fixed size in pixels 4396 * @param height the height, either {@link #WRAP_CONTENT}, 4397 * {@link #FILL_PARENT} (replaced by {@link #MATCH_PARENT} in 4398 * API Level 8), or a fixed size in pixels 4399 */ 4400 public LayoutParams(int width, int height) { 4401 this.width = width; 4402 this.height = height; 4403 } 4404 4405 /** 4406 * Copy constructor. Clones the width and height values of the source. 4407 * 4408 * @param source The layout params to copy from. 4409 */ 4410 public LayoutParams(LayoutParams source) { 4411 this.width = source.width; 4412 this.height = source.height; 4413 } 4414 4415 /** 4416 * Used internally by MarginLayoutParams. 4417 * @hide 4418 */ 4419 LayoutParams() { 4420 } 4421 4422 /** 4423 * Extracts the layout parameters from the supplied attributes. 4424 * 4425 * @param a the style attributes to extract the parameters from 4426 * @param widthAttr the identifier of the width attribute 4427 * @param heightAttr the identifier of the height attribute 4428 */ 4429 protected void setBaseAttributes(TypedArray a, int widthAttr, int heightAttr) { 4430 width = a.getLayoutDimension(widthAttr, "layout_width"); 4431 height = a.getLayoutDimension(heightAttr, "layout_height"); 4432 } 4433 4434 /** 4435 * Returns a String representation of this set of layout parameters. 4436 * 4437 * @param output the String to prepend to the internal representation 4438 * @return a String with the following format: output + 4439 * "ViewGroup.LayoutParams={ width=WIDTH, height=HEIGHT }" 4440 * 4441 * @hide 4442 */ 4443 public String debug(String output) { 4444 return output + "ViewGroup.LayoutParams={ width=" 4445 + sizeToString(width) + ", height=" + sizeToString(height) + " }"; 4446 } 4447 4448 /** 4449 * Converts the specified size to a readable String. 4450 * 4451 * @param size the size to convert 4452 * @return a String instance representing the supplied size 4453 * 4454 * @hide 4455 */ 4456 protected static String sizeToString(int size) { 4457 if (size == WRAP_CONTENT) { 4458 return "wrap-content"; 4459 } 4460 if (size == MATCH_PARENT) { 4461 return "match-parent"; 4462 } 4463 return String.valueOf(size); 4464 } 4465 } 4466 4467 /** 4468 * Per-child layout information for layouts that support margins. 4469 * See 4470 * {@link android.R.styleable#ViewGroup_MarginLayout ViewGroup Margin Layout Attributes} 4471 * for a list of all child view attributes that this class supports. 4472 */ 4473 public static class MarginLayoutParams extends ViewGroup.LayoutParams { 4474 /** 4475 * The left margin in pixels of the child. 4476 */ 4477 @ViewDebug.ExportedProperty(category = "layout") 4478 public int leftMargin; 4479 4480 /** 4481 * The top margin in pixels of the child. 4482 */ 4483 @ViewDebug.ExportedProperty(category = "layout") 4484 public int topMargin; 4485 4486 /** 4487 * The right margin in pixels of the child. 4488 */ 4489 @ViewDebug.ExportedProperty(category = "layout") 4490 public int rightMargin; 4491 4492 /** 4493 * The bottom margin in pixels of the child. 4494 */ 4495 @ViewDebug.ExportedProperty(category = "layout") 4496 public int bottomMargin; 4497 4498 /** 4499 * Creates a new set of layout parameters. The values are extracted from 4500 * the supplied attributes set and context. 4501 * 4502 * @param c the application environment 4503 * @param attrs the set of attributes from which to extract the layout 4504 * parameters' values 4505 */ 4506 public MarginLayoutParams(Context c, AttributeSet attrs) { 4507 super(); 4508 4509 TypedArray a = c.obtainStyledAttributes(attrs, R.styleable.ViewGroup_MarginLayout); 4510 setBaseAttributes(a, 4511 R.styleable.ViewGroup_MarginLayout_layout_width, 4512 R.styleable.ViewGroup_MarginLayout_layout_height); 4513 4514 int margin = a.getDimensionPixelSize( 4515 com.android.internal.R.styleable.ViewGroup_MarginLayout_layout_margin, -1); 4516 if (margin >= 0) { 4517 leftMargin = margin; 4518 topMargin = margin; 4519 rightMargin= margin; 4520 bottomMargin = margin; 4521 } else { 4522 leftMargin = a.getDimensionPixelSize( 4523 R.styleable.ViewGroup_MarginLayout_layout_marginLeft, 0); 4524 topMargin = a.getDimensionPixelSize( 4525 R.styleable.ViewGroup_MarginLayout_layout_marginTop, 0); 4526 rightMargin = a.getDimensionPixelSize( 4527 R.styleable.ViewGroup_MarginLayout_layout_marginRight, 0); 4528 bottomMargin = a.getDimensionPixelSize( 4529 R.styleable.ViewGroup_MarginLayout_layout_marginBottom, 0); 4530 } 4531 4532 a.recycle(); 4533 } 4534 4535 /** 4536 * {@inheritDoc} 4537 */ 4538 public MarginLayoutParams(int width, int height) { 4539 super(width, height); 4540 } 4541 4542 /** 4543 * Copy constructor. Clones the width, height and margin values of the source. 4544 * 4545 * @param source The layout params to copy from. 4546 */ 4547 public MarginLayoutParams(MarginLayoutParams source) { 4548 this.width = source.width; 4549 this.height = source.height; 4550 4551 this.leftMargin = source.leftMargin; 4552 this.topMargin = source.topMargin; 4553 this.rightMargin = source.rightMargin; 4554 this.bottomMargin = source.bottomMargin; 4555 } 4556 4557 /** 4558 * {@inheritDoc} 4559 */ 4560 public MarginLayoutParams(LayoutParams source) { 4561 super(source); 4562 } 4563 4564 /** 4565 * Sets the margins, in pixels. 4566 * 4567 * @param left the left margin size 4568 * @param top the top margin size 4569 * @param right the right margin size 4570 * @param bottom the bottom margin size 4571 * 4572 * @attr ref android.R.styleable#ViewGroup_MarginLayout_layout_marginLeft 4573 * @attr ref android.R.styleable#ViewGroup_MarginLayout_layout_marginTop 4574 * @attr ref android.R.styleable#ViewGroup_MarginLayout_layout_marginRight 4575 * @attr ref android.R.styleable#ViewGroup_MarginLayout_layout_marginBottom 4576 */ 4577 public void setMargins(int left, int top, int right, int bottom) { 4578 leftMargin = left; 4579 topMargin = top; 4580 rightMargin = right; 4581 bottomMargin = bottom; 4582 } 4583 } 4584 4585 /* Describes a touched view and the ids of the pointers that it has captured. 4586 * 4587 * This code assumes that pointer ids are always in the range 0..31 such that 4588 * it can use a bitfield to track which pointer ids are present. 4589 * As it happens, the lower layers of the input dispatch pipeline also use the 4590 * same trick so the assumption should be safe here... 4591 */ 4592 private static final class TouchTarget { 4593 private static final int MAX_RECYCLED = 32; 4594 private static final Object sRecycleLock = new Object(); 4595 private static TouchTarget sRecycleBin; 4596 private static int sRecycledCount; 4597 4598 public static final int ALL_POINTER_IDS = -1; // all ones 4599 4600 // The touched child view. 4601 public View child; 4602 4603 // The combined bit mask of pointer ids for all pointers captured by the target. 4604 public int pointerIdBits; 4605 4606 // The next target in the target list. 4607 public TouchTarget next; 4608 4609 private TouchTarget() { 4610 } 4611 4612 public static TouchTarget obtain(View child, int pointerIdBits) { 4613 final TouchTarget target; 4614 synchronized (sRecycleLock) { 4615 if (sRecycleBin == null) { 4616 target = new TouchTarget(); 4617 } else { 4618 target = sRecycleBin; 4619 sRecycleBin = target.next; 4620 sRecycledCount--; 4621 target.next = null; 4622 } 4623 } 4624 target.child = child; 4625 target.pointerIdBits = pointerIdBits; 4626 return target; 4627 } 4628 4629 public void recycle() { 4630 synchronized (sRecycleLock) { 4631 if (sRecycledCount < MAX_RECYCLED) { 4632 next = sRecycleBin; 4633 sRecycleBin = this; 4634 sRecycledCount += 1; 4635 } else { 4636 next = null; 4637 } 4638 child = null; 4639 } 4640 } 4641 } 4642} 4643