ViewGroup.java revision 4e6319b73c85082e18d1c532b86336ddd1f8cfaa
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; 21import com.android.internal.util.Predicate; 22 23import android.content.Context; 24import android.content.res.Configuration; 25import android.content.res.TypedArray; 26import android.graphics.Bitmap; 27import android.graphics.Canvas; 28import android.graphics.Matrix; 29import android.graphics.Paint; 30import android.graphics.PointF; 31import android.graphics.Rect; 32import android.graphics.RectF; 33import android.graphics.Region; 34import android.os.Parcelable; 35import android.os.SystemClock; 36import android.util.AttributeSet; 37import android.util.Log; 38import android.util.SparseArray; 39import android.view.accessibility.AccessibilityEvent; 40import android.view.animation.Animation; 41import android.view.animation.AnimationUtils; 42import android.view.animation.LayoutAnimationController; 43import android.view.animation.Transformation; 44 45import java.util.ArrayList; 46 47/** 48 * <p> 49 * A <code>ViewGroup</code> is a special view that can contain other views 50 * (called children.) The view group is the base class for layouts and views 51 * containers. This class also defines the 52 * {@link android.view.ViewGroup.LayoutParams} class which serves as the base 53 * class for layouts parameters. 54 * </p> 55 * 56 * <p> 57 * Also see {@link LayoutParams} for layout attributes. 58 * </p> 59 * 60 * @attr ref android.R.styleable#ViewGroup_clipChildren 61 * @attr ref android.R.styleable#ViewGroup_clipToPadding 62 * @attr ref android.R.styleable#ViewGroup_layoutAnimation 63 * @attr ref android.R.styleable#ViewGroup_animationCache 64 * @attr ref android.R.styleable#ViewGroup_persistentDrawingCache 65 * @attr ref android.R.styleable#ViewGroup_alwaysDrawnWithCache 66 * @attr ref android.R.styleable#ViewGroup_addStatesFromChildren 67 * @attr ref android.R.styleable#ViewGroup_descendantFocusability 68 * @attr ref android.R.styleable#ViewGroup_animateLayoutChanges 69 */ 70public abstract class ViewGroup extends View implements ViewParent, ViewManager { 71 72 private static final boolean DBG = false; 73 74 /** 75 * Views which have been hidden or removed which need to be animated on 76 * their way out. 77 * This field should be made private, so it is hidden from the SDK. 78 * {@hide} 79 */ 80 protected ArrayList<View> mDisappearingChildren; 81 82 /** 83 * Listener used to propagate events indicating when children are added 84 * and/or removed from a view group. 85 * This field should be made private, so it is hidden from the SDK. 86 * {@hide} 87 */ 88 protected OnHierarchyChangeListener mOnHierarchyChangeListener; 89 90 // The view contained within this ViewGroup that has or contains focus. 91 private View mFocused; 92 93 /** 94 * A Transformation used when drawing children, to 95 * apply on the child being drawn. 96 */ 97 private final Transformation mChildTransformation = new Transformation(); 98 99 /** 100 * Used to track the current invalidation region. 101 */ 102 private RectF mInvalidateRegion; 103 104 /** 105 * A Transformation used to calculate a correct 106 * invalidation area when the application is autoscaled. 107 */ 108 private Transformation mInvalidationTransformation; 109 110 // View currently under an ongoing drag 111 private View mCurrentDragView; 112 113 // Does this group have a child that can accept the current drag payload? 114 private boolean mChildAcceptsDrag; 115 116 // Used during drag dispatch 117 private final PointF mLocalPoint = new PointF(); 118 119 // Layout animation 120 private LayoutAnimationController mLayoutAnimationController; 121 private Animation.AnimationListener mAnimationListener; 122 123 // First touch target in the linked list of touch targets. 124 private TouchTarget mFirstTouchTarget; 125 126 // Temporary arrays for splitting pointers. 127 private int[] mTmpPointerIndexMap; 128 private int[] mTmpPointerIds; 129 private MotionEvent.PointerCoords[] mTmpPointerCoords; 130 131 /** 132 * Internal flags. 133 * 134 * This field should be made private, so it is hidden from the SDK. 135 * {@hide} 136 */ 137 protected int mGroupFlags; 138 139 // When set, ViewGroup invalidates only the child's rectangle 140 // Set by default 141 private static final int FLAG_CLIP_CHILDREN = 0x1; 142 143 // When set, ViewGroup excludes the padding area from the invalidate rectangle 144 // Set by default 145 private static final int FLAG_CLIP_TO_PADDING = 0x2; 146 147 // When set, dispatchDraw() will invoke invalidate(); this is set by drawChild() when 148 // a child needs to be invalidated and FLAG_OPTIMIZE_INVALIDATE is set 149 private static final int FLAG_INVALIDATE_REQUIRED = 0x4; 150 151 // When set, dispatchDraw() will run the layout animation and unset the flag 152 private static final int FLAG_RUN_ANIMATION = 0x8; 153 154 // When set, there is either no layout animation on the ViewGroup or the layout 155 // animation is over 156 // Set by default 157 private static final int FLAG_ANIMATION_DONE = 0x10; 158 159 // If set, this ViewGroup has padding; if unset there is no padding and we don't need 160 // to clip it, even if FLAG_CLIP_TO_PADDING is set 161 private static final int FLAG_PADDING_NOT_NULL = 0x20; 162 163 // When set, this ViewGroup caches its children in a Bitmap before starting a layout animation 164 // Set by default 165 private static final int FLAG_ANIMATION_CACHE = 0x40; 166 167 // When set, this ViewGroup converts calls to invalidate(Rect) to invalidate() during a 168 // layout animation; this avoid clobbering the hierarchy 169 // Automatically set when the layout animation starts, depending on the animation's 170 // characteristics 171 private static final int FLAG_OPTIMIZE_INVALIDATE = 0x80; 172 173 // When set, the next call to drawChild() will clear mChildTransformation's matrix 174 private static final int FLAG_CLEAR_TRANSFORMATION = 0x100; 175 176 // When set, this ViewGroup invokes mAnimationListener.onAnimationEnd() and removes 177 // the children's Bitmap caches if necessary 178 // This flag is set when the layout animation is over (after FLAG_ANIMATION_DONE is set) 179 private static final int FLAG_NOTIFY_ANIMATION_LISTENER = 0x200; 180 181 /** 182 * When set, the drawing method will call {@link #getChildDrawingOrder(int, int)} 183 * to get the index of the child to draw for that iteration. 184 * 185 * @hide 186 */ 187 protected static final int FLAG_USE_CHILD_DRAWING_ORDER = 0x400; 188 189 /** 190 * When set, this ViewGroup supports static transformations on children; this causes 191 * {@link #getChildStaticTransformation(View, android.view.animation.Transformation)} to be 192 * invoked when a child is drawn. 193 * 194 * Any subclass overriding 195 * {@link #getChildStaticTransformation(View, android.view.animation.Transformation)} should 196 * set this flags in {@link #mGroupFlags}. 197 * 198 * {@hide} 199 */ 200 protected static final int FLAG_SUPPORT_STATIC_TRANSFORMATIONS = 0x800; 201 202 // When the previous drawChild() invocation used an alpha value that was lower than 203 // 1.0 and set it in mCachePaint 204 private static final int FLAG_ALPHA_LOWER_THAN_ONE = 0x1000; 205 206 /** 207 * When set, this ViewGroup's drawable states also include those 208 * of its children. 209 */ 210 private static final int FLAG_ADD_STATES_FROM_CHILDREN = 0x2000; 211 212 /** 213 * When set, this ViewGroup tries to always draw its children using their drawing cache. 214 */ 215 private static final int FLAG_ALWAYS_DRAWN_WITH_CACHE = 0x4000; 216 217 /** 218 * When set, and if FLAG_ALWAYS_DRAWN_WITH_CACHE is not set, this ViewGroup will try to 219 * draw its children with their drawing cache. 220 */ 221 private static final int FLAG_CHILDREN_DRAWN_WITH_CACHE = 0x8000; 222 223 /** 224 * When set, this group will go through its list of children to notify them of 225 * any drawable state change. 226 */ 227 private static final int FLAG_NOTIFY_CHILDREN_ON_DRAWABLE_STATE_CHANGE = 0x10000; 228 229 private static final int FLAG_MASK_FOCUSABILITY = 0x60000; 230 231 /** 232 * This view will get focus before any of its descendants. 233 */ 234 public static final int FOCUS_BEFORE_DESCENDANTS = 0x20000; 235 236 /** 237 * This view will get focus only if none of its descendants want it. 238 */ 239 public static final int FOCUS_AFTER_DESCENDANTS = 0x40000; 240 241 /** 242 * This view will block any of its descendants from getting focus, even 243 * if they are focusable. 244 */ 245 public static final int FOCUS_BLOCK_DESCENDANTS = 0x60000; 246 247 /** 248 * Used to map between enum in attrubutes and flag values. 249 */ 250 private static final int[] DESCENDANT_FOCUSABILITY_FLAGS = 251 {FOCUS_BEFORE_DESCENDANTS, FOCUS_AFTER_DESCENDANTS, 252 FOCUS_BLOCK_DESCENDANTS}; 253 254 /** 255 * When set, this ViewGroup should not intercept touch events. 256 * {@hide} 257 */ 258 protected static final int FLAG_DISALLOW_INTERCEPT = 0x80000; 259 260 /** 261 * When set, this ViewGroup will split MotionEvents to multiple child Views when appropriate. 262 */ 263 private static final int FLAG_SPLIT_MOTION_EVENTS = 0x200000; 264 265 /** 266 * Indicates which types of drawing caches are to be kept in memory. 267 * This field should be made private, so it is hidden from the SDK. 268 * {@hide} 269 */ 270 protected int mPersistentDrawingCache; 271 272 /** 273 * Used to indicate that no drawing cache should be kept in memory. 274 */ 275 public static final int PERSISTENT_NO_CACHE = 0x0; 276 277 /** 278 * Used to indicate that the animation drawing cache should be kept in memory. 279 */ 280 public static final int PERSISTENT_ANIMATION_CACHE = 0x1; 281 282 /** 283 * Used to indicate that the scrolling drawing cache should be kept in memory. 284 */ 285 public static final int PERSISTENT_SCROLLING_CACHE = 0x2; 286 287 /** 288 * Used to indicate that all drawing caches should be kept in memory. 289 */ 290 public static final int PERSISTENT_ALL_CACHES = 0x3; 291 292 /** 293 * We clip to padding when FLAG_CLIP_TO_PADDING and FLAG_PADDING_NOT_NULL 294 * are set at the same time. 295 */ 296 protected static final int CLIP_TO_PADDING_MASK = FLAG_CLIP_TO_PADDING | FLAG_PADDING_NOT_NULL; 297 298 // Index of the child's left position in the mLocation array 299 private static final int CHILD_LEFT_INDEX = 0; 300 // Index of the child's top position in the mLocation array 301 private static final int CHILD_TOP_INDEX = 1; 302 303 // Child views of this ViewGroup 304 private View[] mChildren; 305 // Number of valid children in the mChildren array, the rest should be null or not 306 // considered as children 307 private int mChildrenCount; 308 309 private static final int ARRAY_INITIAL_CAPACITY = 12; 310 private static final int ARRAY_CAPACITY_INCREMENT = 12; 311 312 // Used to draw cached views 313 private final Paint mCachePaint = new Paint(); 314 315 // Used to animate add/remove changes in layout 316 private LayoutTransition mTransition; 317 318 // The set of views that are currently being transitioned. This list is used to track views 319 // being removed that should not actually be removed from the parent yet because they are 320 // being animated. 321 private ArrayList<View> mTransitioningViews; 322 323 // List of children changing visibility. This is used to potentially keep rendering 324 // views during a transition when they otherwise would have become gone/invisible 325 private ArrayList<View> mVisibilityChangingChildren; 326 327 public ViewGroup(Context context) { 328 super(context); 329 initViewGroup(); 330 } 331 332 public ViewGroup(Context context, AttributeSet attrs) { 333 super(context, attrs); 334 initViewGroup(); 335 initFromAttributes(context, attrs); 336 } 337 338 public ViewGroup(Context context, AttributeSet attrs, int defStyle) { 339 super(context, attrs, defStyle); 340 initViewGroup(); 341 initFromAttributes(context, attrs); 342 } 343 344 private void initViewGroup() { 345 // ViewGroup doesn't draw by default 346 setFlags(WILL_NOT_DRAW, DRAW_MASK); 347 mGroupFlags |= FLAG_CLIP_CHILDREN; 348 mGroupFlags |= FLAG_CLIP_TO_PADDING; 349 mGroupFlags |= FLAG_ANIMATION_DONE; 350 mGroupFlags |= FLAG_ANIMATION_CACHE; 351 mGroupFlags |= FLAG_ALWAYS_DRAWN_WITH_CACHE; 352 353 setDescendantFocusability(FOCUS_BEFORE_DESCENDANTS); 354 355 mChildren = new View[ARRAY_INITIAL_CAPACITY]; 356 mChildrenCount = 0; 357 358 mCachePaint.setDither(false); 359 360 mPersistentDrawingCache = PERSISTENT_SCROLLING_CACHE; 361 } 362 363 private void initFromAttributes(Context context, AttributeSet attrs) { 364 TypedArray a = context.obtainStyledAttributes(attrs, 365 R.styleable.ViewGroup); 366 367 final int N = a.getIndexCount(); 368 for (int i = 0; i < N; i++) { 369 int attr = a.getIndex(i); 370 switch (attr) { 371 case R.styleable.ViewGroup_clipChildren: 372 setClipChildren(a.getBoolean(attr, true)); 373 break; 374 case R.styleable.ViewGroup_clipToPadding: 375 setClipToPadding(a.getBoolean(attr, true)); 376 break; 377 case R.styleable.ViewGroup_animationCache: 378 setAnimationCacheEnabled(a.getBoolean(attr, true)); 379 break; 380 case R.styleable.ViewGroup_persistentDrawingCache: 381 setPersistentDrawingCache(a.getInt(attr, PERSISTENT_SCROLLING_CACHE)); 382 break; 383 case R.styleable.ViewGroup_addStatesFromChildren: 384 setAddStatesFromChildren(a.getBoolean(attr, false)); 385 break; 386 case R.styleable.ViewGroup_alwaysDrawnWithCache: 387 setAlwaysDrawnWithCacheEnabled(a.getBoolean(attr, true)); 388 break; 389 case R.styleable.ViewGroup_layoutAnimation: 390 int id = a.getResourceId(attr, -1); 391 if (id > 0) { 392 setLayoutAnimation(AnimationUtils.loadLayoutAnimation(mContext, id)); 393 } 394 break; 395 case R.styleable.ViewGroup_descendantFocusability: 396 setDescendantFocusability(DESCENDANT_FOCUSABILITY_FLAGS[a.getInt(attr, 0)]); 397 break; 398 case R.styleable.ViewGroup_splitMotionEvents: 399 setMotionEventSplittingEnabled(a.getBoolean(attr, false)); 400 break; 401 case R.styleable.ViewGroup_animateLayoutChanges: 402 boolean animateLayoutChanges = a.getBoolean(attr, false); 403 if (animateLayoutChanges) { 404 setLayoutTransition(new LayoutTransition()); 405 } 406 break; 407 } 408 } 409 410 a.recycle(); 411 } 412 413 /** 414 * Gets the descendant focusability of this view group. The descendant 415 * focusability defines the relationship between this view group and its 416 * descendants when looking for a view to take focus in 417 * {@link #requestFocus(int, android.graphics.Rect)}. 418 * 419 * @return one of {@link #FOCUS_BEFORE_DESCENDANTS}, {@link #FOCUS_AFTER_DESCENDANTS}, 420 * {@link #FOCUS_BLOCK_DESCENDANTS}. 421 */ 422 @ViewDebug.ExportedProperty(category = "focus", mapping = { 423 @ViewDebug.IntToString(from = FOCUS_BEFORE_DESCENDANTS, to = "FOCUS_BEFORE_DESCENDANTS"), 424 @ViewDebug.IntToString(from = FOCUS_AFTER_DESCENDANTS, to = "FOCUS_AFTER_DESCENDANTS"), 425 @ViewDebug.IntToString(from = FOCUS_BLOCK_DESCENDANTS, to = "FOCUS_BLOCK_DESCENDANTS") 426 }) 427 public int getDescendantFocusability() { 428 return mGroupFlags & FLAG_MASK_FOCUSABILITY; 429 } 430 431 /** 432 * Set the descendant focusability of this view group. This defines the relationship 433 * between this view group and its descendants when looking for a view to 434 * take focus in {@link #requestFocus(int, android.graphics.Rect)}. 435 * 436 * @param focusability one of {@link #FOCUS_BEFORE_DESCENDANTS}, {@link #FOCUS_AFTER_DESCENDANTS}, 437 * {@link #FOCUS_BLOCK_DESCENDANTS}. 438 */ 439 public void setDescendantFocusability(int focusability) { 440 switch (focusability) { 441 case FOCUS_BEFORE_DESCENDANTS: 442 case FOCUS_AFTER_DESCENDANTS: 443 case FOCUS_BLOCK_DESCENDANTS: 444 break; 445 default: 446 throw new IllegalArgumentException("must be one of FOCUS_BEFORE_DESCENDANTS, " 447 + "FOCUS_AFTER_DESCENDANTS, FOCUS_BLOCK_DESCENDANTS"); 448 } 449 mGroupFlags &= ~FLAG_MASK_FOCUSABILITY; 450 mGroupFlags |= (focusability & FLAG_MASK_FOCUSABILITY); 451 } 452 453 /** 454 * {@inheritDoc} 455 */ 456 @Override 457 void handleFocusGainInternal(int direction, Rect previouslyFocusedRect) { 458 if (mFocused != null) { 459 mFocused.unFocus(); 460 mFocused = null; 461 } 462 super.handleFocusGainInternal(direction, previouslyFocusedRect); 463 } 464 465 /** 466 * {@inheritDoc} 467 */ 468 public void requestChildFocus(View child, View focused) { 469 if (DBG) { 470 System.out.println(this + " requestChildFocus()"); 471 } 472 if (getDescendantFocusability() == FOCUS_BLOCK_DESCENDANTS) { 473 return; 474 } 475 476 // Unfocus us, if necessary 477 super.unFocus(); 478 479 // We had a previous notion of who had focus. Clear it. 480 if (mFocused != child) { 481 if (mFocused != null) { 482 mFocused.unFocus(); 483 } 484 485 mFocused = child; 486 } 487 if (mParent != null) { 488 mParent.requestChildFocus(this, focused); 489 } 490 } 491 492 /** 493 * {@inheritDoc} 494 */ 495 public void focusableViewAvailable(View v) { 496 if (mParent != null 497 // shortcut: don't report a new focusable view if we block our descendants from 498 // getting focus 499 && (getDescendantFocusability() != FOCUS_BLOCK_DESCENDANTS) 500 // shortcut: don't report a new focusable view if we already are focused 501 // (and we don't prefer our descendants) 502 // 503 // note: knowing that mFocused is non-null is not a good enough reason 504 // to break the traversal since in that case we'd actually have to find 505 // the focused view and make sure it wasn't FOCUS_AFTER_DESCENDANTS and 506 // an ancestor of v; this will get checked for at ViewRoot 507 && !(isFocused() && getDescendantFocusability() != FOCUS_AFTER_DESCENDANTS)) { 508 mParent.focusableViewAvailable(v); 509 } 510 } 511 512 /** 513 * {@inheritDoc} 514 */ 515 public boolean showContextMenuForChild(View originalView) { 516 return mParent != null && mParent.showContextMenuForChild(originalView); 517 } 518 519 /** 520 * {@inheritDoc} 521 */ 522 public ActionMode startActionModeForChild(View originalView, ActionMode.Callback callback) { 523 return mParent != null ? mParent.startActionModeForChild(originalView, callback) : null; 524 } 525 526 /** 527 * Find the nearest view in the specified direction that wants to take 528 * focus. 529 * 530 * @param focused The view that currently has focus 531 * @param direction One of FOCUS_UP, FOCUS_DOWN, FOCUS_LEFT, and 532 * FOCUS_RIGHT, or 0 for not applicable. 533 */ 534 public View focusSearch(View focused, int direction) { 535 if (isRootNamespace()) { 536 // root namespace means we should consider ourselves the top of the 537 // tree for focus searching; otherwise we could be focus searching 538 // into other tabs. see LocalActivityManager and TabHost for more info 539 return FocusFinder.getInstance().findNextFocus(this, focused, direction); 540 } else if (mParent != null) { 541 return mParent.focusSearch(focused, direction); 542 } 543 return null; 544 } 545 546 /** 547 * {@inheritDoc} 548 */ 549 public boolean requestChildRectangleOnScreen(View child, Rect rectangle, boolean immediate) { 550 return false; 551 } 552 553 /** 554 * {@inheritDoc} 555 */ 556 @Override 557 public boolean dispatchUnhandledMove(View focused, int direction) { 558 return mFocused != null && 559 mFocused.dispatchUnhandledMove(focused, direction); 560 } 561 562 /** 563 * {@inheritDoc} 564 */ 565 public void clearChildFocus(View child) { 566 if (DBG) { 567 System.out.println(this + " clearChildFocus()"); 568 } 569 570 mFocused = null; 571 if (mParent != null) { 572 mParent.clearChildFocus(this); 573 } 574 } 575 576 /** 577 * {@inheritDoc} 578 */ 579 @Override 580 public void clearFocus() { 581 super.clearFocus(); 582 583 // clear any child focus if it exists 584 if (mFocused != null) { 585 mFocused.clearFocus(); 586 } 587 } 588 589 /** 590 * {@inheritDoc} 591 */ 592 @Override 593 void unFocus() { 594 if (DBG) { 595 System.out.println(this + " unFocus()"); 596 } 597 598 super.unFocus(); 599 if (mFocused != null) { 600 mFocused.unFocus(); 601 } 602 mFocused = null; 603 } 604 605 /** 606 * Returns the focused child of this view, if any. The child may have focus 607 * or contain focus. 608 * 609 * @return the focused child or null. 610 */ 611 public View getFocusedChild() { 612 return mFocused; 613 } 614 615 /** 616 * Returns true if this view has or contains focus 617 * 618 * @return true if this view has or contains focus 619 */ 620 @Override 621 public boolean hasFocus() { 622 return (mPrivateFlags & FOCUSED) != 0 || mFocused != null; 623 } 624 625 /* 626 * (non-Javadoc) 627 * 628 * @see android.view.View#findFocus() 629 */ 630 @Override 631 public View findFocus() { 632 if (DBG) { 633 System.out.println("Find focus in " + this + ": flags=" 634 + isFocused() + ", child=" + mFocused); 635 } 636 637 if (isFocused()) { 638 return this; 639 } 640 641 if (mFocused != null) { 642 return mFocused.findFocus(); 643 } 644 return null; 645 } 646 647 /** 648 * {@inheritDoc} 649 */ 650 @Override 651 public boolean hasFocusable() { 652 if ((mViewFlags & VISIBILITY_MASK) != VISIBLE) { 653 return false; 654 } 655 656 if (isFocusable()) { 657 return true; 658 } 659 660 final int descendantFocusability = getDescendantFocusability(); 661 if (descendantFocusability != FOCUS_BLOCK_DESCENDANTS) { 662 final int count = mChildrenCount; 663 final View[] children = mChildren; 664 665 for (int i = 0; i < count; i++) { 666 final View child = children[i]; 667 if (child.hasFocusable()) { 668 return true; 669 } 670 } 671 } 672 673 return false; 674 } 675 676 /** 677 * {@inheritDoc} 678 */ 679 @Override 680 public void addFocusables(ArrayList<View> views, int direction) { 681 addFocusables(views, direction, FOCUSABLES_TOUCH_MODE); 682 } 683 684 /** 685 * {@inheritDoc} 686 */ 687 @Override 688 public void addFocusables(ArrayList<View> views, int direction, int focusableMode) { 689 final int focusableCount = views.size(); 690 691 final int descendantFocusability = getDescendantFocusability(); 692 693 if (descendantFocusability != FOCUS_BLOCK_DESCENDANTS) { 694 final int count = mChildrenCount; 695 final View[] children = mChildren; 696 697 for (int i = 0; i < count; i++) { 698 final View child = children[i]; 699 if ((child.mViewFlags & VISIBILITY_MASK) == VISIBLE) { 700 child.addFocusables(views, direction, focusableMode); 701 } 702 } 703 } 704 705 // we add ourselves (if focusable) in all cases except for when we are 706 // FOCUS_AFTER_DESCENDANTS and there are some descendants focusable. this is 707 // to avoid the focus search finding layouts when a more precise search 708 // among the focusable children would be more interesting. 709 if ( 710 descendantFocusability != FOCUS_AFTER_DESCENDANTS || 711 // No focusable descendants 712 (focusableCount == views.size())) { 713 super.addFocusables(views, direction, focusableMode); 714 } 715 } 716 717 /** 718 * {@inheritDoc} 719 */ 720 @Override 721 public void dispatchWindowFocusChanged(boolean hasFocus) { 722 super.dispatchWindowFocusChanged(hasFocus); 723 final int count = mChildrenCount; 724 final View[] children = mChildren; 725 for (int i = 0; i < count; i++) { 726 children[i].dispatchWindowFocusChanged(hasFocus); 727 } 728 } 729 730 /** 731 * {@inheritDoc} 732 */ 733 @Override 734 public void addTouchables(ArrayList<View> views) { 735 super.addTouchables(views); 736 737 final int count = mChildrenCount; 738 final View[] children = mChildren; 739 740 for (int i = 0; i < count; i++) { 741 final View child = children[i]; 742 if ((child.mViewFlags & VISIBILITY_MASK) == VISIBLE) { 743 child.addTouchables(views); 744 } 745 } 746 } 747 748 /** 749 * {@inheritDoc} 750 */ 751 @Override 752 public void dispatchDisplayHint(int hint) { 753 super.dispatchDisplayHint(hint); 754 final int count = mChildrenCount; 755 final View[] children = mChildren; 756 for (int i = 0; i < count; i++) { 757 children[i].dispatchDisplayHint(hint); 758 } 759 } 760 761 /** 762 * @hide 763 * @param child 764 * @param visibility 765 */ 766 void onChildVisibilityChanged(View child, int visibility) { 767 if (mTransition != null) { 768 if (visibility == VISIBLE) { 769 mTransition.showChild(this, child); 770 } else { 771 mTransition.hideChild(this, child); 772 } 773 if (visibility != VISIBLE) { 774 // Only track this on disappearing views - appearing views are already visible 775 // and don't need special handling during drawChild() 776 if (mVisibilityChangingChildren == null) { 777 mVisibilityChangingChildren = new ArrayList<View>(); 778 } 779 mVisibilityChangingChildren.add(child); 780 if (mTransitioningViews != null && mTransitioningViews.contains(child)) { 781 addDisappearingView(child); 782 } 783 } 784 } 785 } 786 787 /** 788 * {@inheritDoc} 789 */ 790 @Override 791 protected void dispatchVisibilityChanged(View changedView, int visibility) { 792 super.dispatchVisibilityChanged(changedView, visibility); 793 final int count = mChildrenCount; 794 final View[] children = mChildren; 795 for (int i = 0; i < count; i++) { 796 children[i].dispatchVisibilityChanged(changedView, visibility); 797 } 798 } 799 800 /** 801 * {@inheritDoc} 802 */ 803 @Override 804 public void dispatchWindowVisibilityChanged(int visibility) { 805 super.dispatchWindowVisibilityChanged(visibility); 806 final int count = mChildrenCount; 807 final View[] children = mChildren; 808 for (int i = 0; i < count; i++) { 809 children[i].dispatchWindowVisibilityChanged(visibility); 810 } 811 } 812 813 /** 814 * {@inheritDoc} 815 */ 816 @Override 817 public void dispatchConfigurationChanged(Configuration newConfig) { 818 super.dispatchConfigurationChanged(newConfig); 819 final int count = mChildrenCount; 820 final View[] children = mChildren; 821 for (int i = 0; i < count; i++) { 822 children[i].dispatchConfigurationChanged(newConfig); 823 } 824 } 825 826 /** 827 * {@inheritDoc} 828 */ 829 public void recomputeViewAttributes(View child) { 830 ViewParent parent = mParent; 831 if (parent != null) parent.recomputeViewAttributes(this); 832 } 833 834 @Override 835 void dispatchCollectViewAttributes(int visibility) { 836 visibility |= mViewFlags&VISIBILITY_MASK; 837 super.dispatchCollectViewAttributes(visibility); 838 final int count = mChildrenCount; 839 final View[] children = mChildren; 840 for (int i = 0; i < count; i++) { 841 children[i].dispatchCollectViewAttributes(visibility); 842 } 843 } 844 845 /** 846 * {@inheritDoc} 847 */ 848 public void bringChildToFront(View child) { 849 int index = indexOfChild(child); 850 if (index >= 0) { 851 removeFromArray(index); 852 addInArray(child, mChildrenCount); 853 child.mParent = this; 854 } 855 } 856 857 /** 858 * {@inheritDoc} 859 * 860 * !!! TODO: write real docs 861 */ 862 @Override 863 public boolean dispatchDragEvent(DragEvent event) { 864 boolean retval = false; 865 final float tx = event.mX; 866 final float ty = event.mY; 867 868 ViewRoot root = getViewRoot(); 869 870 // Dispatch down the view hierarchy 871 switch (event.mAction) { 872 case DragEvent.ACTION_DRAG_STARTED: { 873 // clear state to recalculate which views we drag over 874 mCurrentDragView = null; 875 876 // Now dispatch down to our children, caching the responses 877 mChildAcceptsDrag = false; 878 final int count = mChildrenCount; 879 final View[] children = mChildren; 880 for (int i = 0; i < count; i++) { 881 final View child = children[i]; 882 if (child.getVisibility() == VISIBLE) { 883 final boolean handled = children[i].dispatchDragEvent(event); 884 children[i].mCanAcceptDrop = handled; 885 if (handled) { 886 mChildAcceptsDrag = true; 887 } 888 } 889 } 890 891 // Return HANDLED if one of our children can accept the drag 892 if (mChildAcceptsDrag) { 893 retval = true; 894 } 895 } break; 896 897 case DragEvent.ACTION_DRAG_ENDED: { 898 // Notify all of our children that the drag is over 899 final int count = mChildrenCount; 900 final View[] children = mChildren; 901 for (int i = 0; i < count; i++) { 902 final View child = children[i]; 903 if (child.getVisibility() == VISIBLE) { 904 child.dispatchDragEvent(event); 905 } 906 } 907 // We consider drag-ended to have been handled if one of our children 908 // had offered to handle the drag. 909 if (mChildAcceptsDrag) { 910 retval = true; 911 } 912 } break; 913 914 case DragEvent.ACTION_DRAG_LOCATION: { 915 // Find the [possibly new] drag target 916 final View target = findFrontmostDroppableChildAt(event.mX, event.mY, mLocalPoint); 917 918 // If we've changed apparent drag target, tell the view root which view 919 // we're over now [for purposes of the eventual drag-recipient-changed 920 // notifications to the framework] and tell the new target that the drag 921 // has entered its bounds. The root will see setDragFocus() calls all 922 // the way down to the final leaf view that is handling the LOCATION event 923 // before reporting the new potential recipient to the framework. 924 if (mCurrentDragView != target) { 925 root.setDragFocus(target); 926 927 final int action = event.mAction; 928 // If we've dragged off of a child view, send it the EXITED message 929 if (mCurrentDragView != null) { 930 event.mAction = DragEvent.ACTION_DRAG_EXITED; 931 mCurrentDragView.dispatchDragEvent(event); 932 } 933 mCurrentDragView = target; 934 935 // If we've dragged over a new child view, send it the ENTERED message 936 if (target != null) { 937 event.mAction = DragEvent.ACTION_DRAG_ENTERED; 938 target.dispatchDragEvent(event); 939 } 940 event.mAction = action; // restore the event's original state 941 } 942 943 // Dispatch the actual drag location notice, localized into its coordinates 944 if (target != null) { 945 event.mX = mLocalPoint.x; 946 event.mY = mLocalPoint.y; 947 948 retval = target.dispatchDragEvent(event); 949 950 event.mX = tx; 951 event.mY = ty; 952 } 953 } break; 954 955 /* Entered / exited dispatch 956 * 957 * DRAG_ENTERED is not dispatched downwards from ViewGroup. The reason for this is 958 * that we're about to get the corresponding LOCATION event, which we will use to 959 * determine which of our children is the new target; at that point we will 960 * push a DRAG_ENTERED down to the new target child [which may itself be a ViewGroup]. 961 * 962 * DRAG_EXITED *is* dispatched all the way down immediately: once we know the 963 * drag has left this ViewGroup, we know by definition that every contained subview 964 * is also no longer under the drag point. 965 */ 966 967 case DragEvent.ACTION_DRAG_EXITED: { 968 if (mCurrentDragView != null) { 969 mCurrentDragView.dispatchDragEvent(event); 970 mCurrentDragView = null; 971 } 972 } break; 973 974 case DragEvent.ACTION_DROP: { 975 if (ViewDebug.DEBUG_DRAG) Log.d(View.VIEW_LOG_TAG, "Drop event: " + event); 976 View target = findFrontmostDroppableChildAt(event.mX, event.mY, mLocalPoint); 977 if (target != null) { 978 if (ViewDebug.DEBUG_DRAG) Log.d(View.VIEW_LOG_TAG, " dispatch drop to " + target); 979 event.mX = mLocalPoint.x; 980 event.mY = mLocalPoint.y; 981 retval = target.dispatchDragEvent(event); 982 event.mX = tx; 983 event.mY = ty; 984 } else { 985 if (ViewDebug.DEBUG_DRAG) { 986 Log.d(View.VIEW_LOG_TAG, " not dropped on an accepting view"); 987 } 988 } 989 } break; 990 } 991 992 // If none of our children could handle the event, try here 993 if (!retval) { 994 // Call up to the View implementation that dispatches to installed listeners 995 retval = super.dispatchDragEvent(event); 996 } 997 return retval; 998 } 999 1000 // Find the frontmost child view that lies under the given point, and calculate 1001 // the position within its own local coordinate system. 1002 View findFrontmostDroppableChildAt(float x, float y, PointF outLocalPoint) { 1003 final int count = mChildrenCount; 1004 final View[] children = mChildren; 1005 for (int i = count - 1; i >= 0; i--) { 1006 final View child = children[i]; 1007 if (!child.mCanAcceptDrop) { 1008 continue; 1009 } 1010 1011 if (isTransformedTouchPointInView(x, y, child, outLocalPoint)) { 1012 return child; 1013 } 1014 } 1015 return null; 1016 } 1017 1018 /** 1019 * {@inheritDoc} 1020 */ 1021 @Override 1022 public boolean dispatchKeyEventPreIme(KeyEvent event) { 1023 if ((mPrivateFlags & (FOCUSED | HAS_BOUNDS)) == (FOCUSED | HAS_BOUNDS)) { 1024 return super.dispatchKeyEventPreIme(event); 1025 } else if (mFocused != null && (mFocused.mPrivateFlags & HAS_BOUNDS) == HAS_BOUNDS) { 1026 return mFocused.dispatchKeyEventPreIme(event); 1027 } 1028 return false; 1029 } 1030 1031 /** 1032 * {@inheritDoc} 1033 */ 1034 @Override 1035 public boolean dispatchKeyEvent(KeyEvent event) { 1036 if ((mPrivateFlags & (FOCUSED | HAS_BOUNDS)) == (FOCUSED | HAS_BOUNDS)) { 1037 return super.dispatchKeyEvent(event); 1038 } else if (mFocused != null && (mFocused.mPrivateFlags & HAS_BOUNDS) == HAS_BOUNDS) { 1039 return mFocused.dispatchKeyEvent(event); 1040 } 1041 return false; 1042 } 1043 1044 /** 1045 * {@inheritDoc} 1046 */ 1047 @Override 1048 public boolean dispatchKeyShortcutEvent(KeyEvent event) { 1049 if ((mPrivateFlags & (FOCUSED | HAS_BOUNDS)) == (FOCUSED | HAS_BOUNDS)) { 1050 return super.dispatchKeyShortcutEvent(event); 1051 } else if (mFocused != null && (mFocused.mPrivateFlags & HAS_BOUNDS) == HAS_BOUNDS) { 1052 return mFocused.dispatchKeyShortcutEvent(event); 1053 } 1054 return false; 1055 } 1056 1057 /** 1058 * {@inheritDoc} 1059 */ 1060 @Override 1061 public boolean dispatchTrackballEvent(MotionEvent event) { 1062 if ((mPrivateFlags & (FOCUSED | HAS_BOUNDS)) == (FOCUSED | HAS_BOUNDS)) { 1063 return super.dispatchTrackballEvent(event); 1064 } else if (mFocused != null && (mFocused.mPrivateFlags & HAS_BOUNDS) == HAS_BOUNDS) { 1065 return mFocused.dispatchTrackballEvent(event); 1066 } 1067 return false; 1068 } 1069 1070 /** 1071 * {@inheritDoc} 1072 */ 1073 @Override 1074 public boolean dispatchTouchEvent(MotionEvent ev) { 1075 if (!onFilterTouchEventForSecurity(ev)) { 1076 return false; 1077 } 1078 1079 final int action = ev.getAction(); 1080 final int actionMasked = action & MotionEvent.ACTION_MASK; 1081 1082 // Handle an initial down. 1083 if (actionMasked == MotionEvent.ACTION_DOWN) { 1084 // Throw away all previous state when starting a new touch gesture. 1085 // The framework may have dropped the up or cancel event for the previous gesture 1086 // due to an app switch, ANR, or some other state change. 1087 cancelAndClearTouchTargets(ev); 1088 resetTouchState(); 1089 } 1090 1091 // Check for interception. 1092 final boolean intercepted; 1093 if (actionMasked == MotionEvent.ACTION_DOWN || mFirstTouchTarget != null) { 1094 final boolean disallowIntercept = (mGroupFlags & FLAG_DISALLOW_INTERCEPT) != 0; 1095 if (!disallowIntercept) { 1096 intercepted = onInterceptTouchEvent(ev); 1097 ev.setAction(action); // restore action in case onInterceptTouchEvent() changed it 1098 } else { 1099 intercepted = false; 1100 } 1101 } else { 1102 intercepted = true; 1103 } 1104 1105 // Check for cancelation. 1106 final boolean canceled = resetCancelNextUpFlag(this) 1107 || actionMasked == MotionEvent.ACTION_CANCEL; 1108 1109 // Update list of touch targets for pointer down, if needed. 1110 final boolean split = (mGroupFlags & FLAG_SPLIT_MOTION_EVENTS) != 0; 1111 TouchTarget newTouchTarget = null; 1112 boolean alreadyDispatchedToNewTouchTarget = false; 1113 if (!canceled && !intercepted) { 1114 if (actionMasked == MotionEvent.ACTION_DOWN 1115 || (split && actionMasked == MotionEvent.ACTION_POINTER_DOWN)) { 1116 final int actionIndex = ev.getActionIndex(); // always 0 for down 1117 final int idBitsToAssign = split ? 1 << ev.getPointerId(actionIndex) 1118 : TouchTarget.ALL_POINTER_IDS; 1119 1120 // Clean up earlier touch targets for this pointer id in case they 1121 // have become out of sync. 1122 removePointersFromTouchTargets(idBitsToAssign); 1123 1124 final int childrenCount = mChildrenCount; 1125 if (childrenCount != 0) { 1126 // Find a child that can receive the event. Scan children from front to back. 1127 final View[] children = mChildren; 1128 final float x = ev.getX(actionIndex); 1129 final float y = ev.getY(actionIndex); 1130 1131 for (int i = childrenCount - 1; i >= 0; i--) { 1132 final View child = children[i]; 1133 if ((child.mViewFlags & VISIBILITY_MASK) != VISIBLE 1134 && child.getAnimation() == null) { 1135 // Skip invisible child unless it is animating. 1136 continue; 1137 } 1138 1139 if (!isTransformedTouchPointInView(x, y, child, null)) { 1140 // New pointer is out of child's bounds. 1141 continue; 1142 } 1143 1144 newTouchTarget = getTouchTarget(child); 1145 if (newTouchTarget != null) { 1146 // Child is already receiving touch within its bounds. 1147 // Give it the new pointer in addition to the ones it is handling. 1148 newTouchTarget.pointerIdBits |= idBitsToAssign; 1149 break; 1150 } 1151 1152 resetCancelNextUpFlag(child); 1153 if (dispatchTransformedTouchEvent(ev, false, child, idBitsToAssign)) { 1154 // Child wants to receive touch within its bounds. 1155 newTouchTarget = addTouchTarget(child, idBitsToAssign); 1156 alreadyDispatchedToNewTouchTarget = true; 1157 break; 1158 } 1159 } 1160 } 1161 1162 if (newTouchTarget == null && mFirstTouchTarget != null) { 1163 // Did not find a child to receive the event. 1164 // Assign the pointer to the least recently added target. 1165 newTouchTarget = mFirstTouchTarget; 1166 while (newTouchTarget.next != null) { 1167 newTouchTarget = newTouchTarget.next; 1168 } 1169 newTouchTarget.pointerIdBits |= idBitsToAssign; 1170 } 1171 } 1172 } 1173 1174 // Dispatch to touch targets. 1175 boolean handled = false; 1176 if (mFirstTouchTarget == null) { 1177 // No touch targets so treat this as an ordinary view. 1178 handled = dispatchTransformedTouchEvent(ev, canceled, null, 1179 TouchTarget.ALL_POINTER_IDS); 1180 } else { 1181 // Dispatch to touch targets, excluding the new touch target if we already 1182 // dispatched to it. Cancel touch targets if necessary. 1183 TouchTarget predecessor = null; 1184 TouchTarget target = mFirstTouchTarget; 1185 while (target != null) { 1186 final TouchTarget next = target.next; 1187 if (alreadyDispatchedToNewTouchTarget && target == newTouchTarget) { 1188 handled = true; 1189 } else { 1190 final boolean cancelChild = resetCancelNextUpFlag(target.child) || intercepted; 1191 if (dispatchTransformedTouchEvent(ev, cancelChild, 1192 target.child, target.pointerIdBits)) { 1193 handled = true; 1194 } 1195 if (cancelChild) { 1196 if (predecessor == null) { 1197 mFirstTouchTarget = next; 1198 } else { 1199 predecessor.next = next; 1200 } 1201 target.recycle(); 1202 target = next; 1203 continue; 1204 } 1205 } 1206 predecessor = target; 1207 target = next; 1208 } 1209 } 1210 1211 // Update list of touch targets for pointer up or cancel, if needed. 1212 if (canceled || actionMasked == MotionEvent.ACTION_UP) { 1213 resetTouchState(); 1214 } else if (split && actionMasked == MotionEvent.ACTION_POINTER_UP) { 1215 final int actionIndex = ev.getActionIndex(); 1216 final int idBitsToRemove = 1 << ev.getPointerId(actionIndex); 1217 removePointersFromTouchTargets(idBitsToRemove); 1218 } 1219 1220 return handled; 1221 } 1222 1223 /** 1224 * Resets all touch state in preparation for a new cycle. 1225 */ 1226 private void resetTouchState() { 1227 clearTouchTargets(); 1228 resetCancelNextUpFlag(this); 1229 mGroupFlags &= ~FLAG_DISALLOW_INTERCEPT; 1230 } 1231 1232 /** 1233 * Resets the cancel next up flag. 1234 * Returns true if the flag was previously set. 1235 */ 1236 private boolean resetCancelNextUpFlag(View view) { 1237 if ((view.mPrivateFlags & CANCEL_NEXT_UP_EVENT) != 0) { 1238 view.mPrivateFlags &= ~CANCEL_NEXT_UP_EVENT; 1239 return true; 1240 } 1241 return false; 1242 } 1243 1244 /** 1245 * Clears all touch targets. 1246 */ 1247 private void clearTouchTargets() { 1248 TouchTarget target = mFirstTouchTarget; 1249 if (target != null) { 1250 do { 1251 TouchTarget next = target.next; 1252 target.recycle(); 1253 target = next; 1254 } while (target != null); 1255 mFirstTouchTarget = null; 1256 } 1257 } 1258 1259 /** 1260 * Cancels and clears all touch targets. 1261 */ 1262 private void cancelAndClearTouchTargets(MotionEvent event) { 1263 if (mFirstTouchTarget != null) { 1264 boolean syntheticEvent = false; 1265 if (event == null) { 1266 final long now = SystemClock.uptimeMillis(); 1267 event = MotionEvent.obtain(now, now, 1268 MotionEvent.ACTION_CANCEL, 0.0f, 0.0f, 0); 1269 syntheticEvent = true; 1270 } 1271 1272 for (TouchTarget target = mFirstTouchTarget; target != null; target = target.next) { 1273 resetCancelNextUpFlag(target.child); 1274 dispatchTransformedTouchEvent(event, true, target.child, target.pointerIdBits); 1275 } 1276 clearTouchTargets(); 1277 1278 if (syntheticEvent) { 1279 event.recycle(); 1280 } 1281 } 1282 } 1283 1284 /** 1285 * Gets the touch target for specified child view. 1286 * Returns null if not found. 1287 */ 1288 private TouchTarget getTouchTarget(View child) { 1289 for (TouchTarget target = mFirstTouchTarget; target != null; target = target.next) { 1290 if (target.child == child) { 1291 return target; 1292 } 1293 } 1294 return null; 1295 } 1296 1297 /** 1298 * Adds a touch target for specified child to the beginning of the list. 1299 * Assumes the target child is not already present. 1300 */ 1301 private TouchTarget addTouchTarget(View child, int pointerIdBits) { 1302 TouchTarget target = TouchTarget.obtain(child, pointerIdBits); 1303 target.next = mFirstTouchTarget; 1304 mFirstTouchTarget = target; 1305 return target; 1306 } 1307 1308 /** 1309 * Removes the pointer ids from consideration. 1310 */ 1311 private void removePointersFromTouchTargets(int pointerIdBits) { 1312 TouchTarget predecessor = null; 1313 TouchTarget target = mFirstTouchTarget; 1314 while (target != null) { 1315 final TouchTarget next = target.next; 1316 if ((target.pointerIdBits & pointerIdBits) != 0) { 1317 target.pointerIdBits &= ~pointerIdBits; 1318 if (target.pointerIdBits == 0) { 1319 if (predecessor == null) { 1320 mFirstTouchTarget = next; 1321 } else { 1322 predecessor.next = next; 1323 } 1324 target.recycle(); 1325 target = next; 1326 continue; 1327 } 1328 } 1329 predecessor = target; 1330 target = next; 1331 } 1332 } 1333 1334 /** 1335 * Returns true if a child view contains the specified point when transformed 1336 * into its coordinate space. 1337 * Child must not be null. 1338 * @hide 1339 */ 1340 protected boolean isTransformedTouchPointInView(float x, float y, View child, 1341 PointF outLocalPoint) { 1342 float localX = x + mScrollX - child.mLeft; 1343 float localY = y + mScrollY - child.mTop; 1344 if (! child.hasIdentityMatrix() && mAttachInfo != null) { 1345 final float[] localXY = mAttachInfo.mTmpTransformLocation; 1346 localXY[0] = localX; 1347 localXY[1] = localY; 1348 child.getInverseMatrix().mapPoints(localXY); 1349 localX = localXY[0]; 1350 localY = localXY[1]; 1351 } 1352 final boolean isInView = child.pointInView(localX, localY); 1353 if (isInView && outLocalPoint != null) { 1354 outLocalPoint.set(localX, localY); 1355 } 1356 return isInView; 1357 } 1358 1359 /** 1360 * Transforms a motion event into the coordinate space of a particular child view, 1361 * filters out irrelevant pointer ids, and overrides its action if necessary. 1362 * If child is null, assumes the MotionEvent will be sent to this ViewGroup instead. 1363 */ 1364 private boolean dispatchTransformedTouchEvent(MotionEvent event, boolean cancel, 1365 View child, int desiredPointerIdBits) { 1366 final boolean handled; 1367 1368 // Canceling motions is a special case. We don't need to perform any transformations 1369 // or filtering. The important part is the action, not the contents. 1370 final int oldAction = event.getAction(); 1371 if (cancel || oldAction == MotionEvent.ACTION_CANCEL) { 1372 event.setAction(MotionEvent.ACTION_CANCEL); 1373 if (child == null) { 1374 handled = super.dispatchTouchEvent(event); 1375 } else { 1376 handled = child.dispatchTouchEvent(event); 1377 } 1378 event.setAction(oldAction); 1379 return handled; 1380 } 1381 1382 // Calculate the number of pointers to deliver. 1383 final int oldPointerCount = event.getPointerCount(); 1384 int newPointerCount = 0; 1385 if (desiredPointerIdBits == TouchTarget.ALL_POINTER_IDS) { 1386 newPointerCount = oldPointerCount; 1387 } else { 1388 for (int i = 0; i < oldPointerCount; i++) { 1389 final int pointerId = event.getPointerId(i); 1390 final int pointerIdBit = 1 << pointerId; 1391 if ((pointerIdBit & desiredPointerIdBits) != 0) { 1392 newPointerCount += 1; 1393 } 1394 } 1395 } 1396 1397 // If for some reason we ended up in an inconsistent state where it looks like we 1398 // might produce a motion event with no pointers in it, then drop the event. 1399 if (newPointerCount == 0) { 1400 return false; 1401 } 1402 1403 // If the number of pointers is the same and we don't need to perform any fancy 1404 // irreversible transformations, then we can reuse the motion event for this 1405 // dispatch as long as we are careful to revert any changes we make. 1406 final boolean reuse = newPointerCount == oldPointerCount 1407 && (child == null || child.hasIdentityMatrix()); 1408 if (reuse) { 1409 if (child == null) { 1410 handled = super.dispatchTouchEvent(event); 1411 } else { 1412 final float offsetX = mScrollX - child.mLeft; 1413 final float offsetY = mScrollY - child.mTop; 1414 event.offsetLocation(offsetX, offsetY); 1415 1416 handled = child.dispatchTouchEvent(event); 1417 1418 event.offsetLocation(-offsetX, -offsetY); 1419 } 1420 return handled; 1421 } 1422 1423 // Make a copy of the event. 1424 // If the number of pointers is different, then we need to filter out irrelevant pointers 1425 // as we make a copy of the motion event. 1426 MotionEvent transformedEvent; 1427 if (newPointerCount == oldPointerCount) { 1428 transformedEvent = MotionEvent.obtain(event); 1429 } else { 1430 growTmpPointerArrays(newPointerCount); 1431 final int[] newPointerIndexMap = mTmpPointerIndexMap; 1432 final int[] newPointerIds = mTmpPointerIds; 1433 final MotionEvent.PointerCoords[] newPointerCoords = mTmpPointerCoords; 1434 1435 int newPointerIndex = 0; 1436 int oldPointerIndex = 0; 1437 while (newPointerIndex < newPointerCount) { 1438 final int pointerId = event.getPointerId(oldPointerIndex); 1439 final int pointerIdBits = 1 << pointerId; 1440 if ((pointerIdBits & desiredPointerIdBits) != 0) { 1441 newPointerIndexMap[newPointerIndex] = oldPointerIndex; 1442 newPointerIds[newPointerIndex] = pointerId; 1443 if (newPointerCoords[newPointerIndex] == null) { 1444 newPointerCoords[newPointerIndex] = new MotionEvent.PointerCoords(); 1445 } 1446 1447 newPointerIndex += 1; 1448 } 1449 oldPointerIndex += 1; 1450 } 1451 1452 final int newAction; 1453 if (cancel) { 1454 newAction = MotionEvent.ACTION_CANCEL; 1455 } else { 1456 final int oldMaskedAction = oldAction & MotionEvent.ACTION_MASK; 1457 if (oldMaskedAction == MotionEvent.ACTION_POINTER_DOWN 1458 || oldMaskedAction == MotionEvent.ACTION_POINTER_UP) { 1459 final int changedPointerId = event.getPointerId( 1460 (oldAction & MotionEvent.ACTION_POINTER_INDEX_MASK) 1461 >> MotionEvent.ACTION_POINTER_INDEX_SHIFT); 1462 final int changedPointerIdBits = 1 << changedPointerId; 1463 if ((changedPointerIdBits & desiredPointerIdBits) != 0) { 1464 if (newPointerCount == 1) { 1465 // The first/last pointer went down/up. 1466 newAction = oldMaskedAction == MotionEvent.ACTION_POINTER_DOWN 1467 ? MotionEvent.ACTION_DOWN : MotionEvent.ACTION_UP; 1468 } else { 1469 // A secondary pointer went down/up. 1470 int newChangedPointerIndex = 0; 1471 while (newPointerIds[newChangedPointerIndex] != changedPointerId) { 1472 newChangedPointerIndex += 1; 1473 } 1474 newAction = oldMaskedAction | (newChangedPointerIndex 1475 << MotionEvent.ACTION_POINTER_INDEX_SHIFT); 1476 } 1477 } else { 1478 // An unrelated pointer changed. 1479 newAction = MotionEvent.ACTION_MOVE; 1480 } 1481 } else { 1482 // Simple up/down/cancel/move motion action. 1483 newAction = oldMaskedAction; 1484 } 1485 } 1486 1487 transformedEvent = null; 1488 final int historySize = event.getHistorySize(); 1489 for (int historyIndex = 0; historyIndex <= historySize; historyIndex++) { 1490 for (newPointerIndex = 0; newPointerIndex < newPointerCount; newPointerIndex++) { 1491 final MotionEvent.PointerCoords c = newPointerCoords[newPointerIndex]; 1492 oldPointerIndex = newPointerIndexMap[newPointerIndex]; 1493 if (historyIndex != historySize) { 1494 event.getHistoricalPointerCoords(oldPointerIndex, historyIndex, c); 1495 } else { 1496 event.getPointerCoords(oldPointerIndex, c); 1497 } 1498 } 1499 1500 final long eventTime; 1501 if (historyIndex != historySize) { 1502 eventTime = event.getHistoricalEventTime(historyIndex); 1503 } else { 1504 eventTime = event.getEventTime(); 1505 } 1506 1507 if (transformedEvent == null) { 1508 transformedEvent = MotionEvent.obtain( 1509 event.getDownTime(), eventTime, newAction, 1510 newPointerCount, newPointerIds, newPointerCoords, 1511 event.getMetaState(), event.getXPrecision(), event.getYPrecision(), 1512 event.getDeviceId(), event.getEdgeFlags(), event.getSource(), 1513 event.getFlags()); 1514 } else { 1515 transformedEvent.addBatch(eventTime, newPointerCoords, 0); 1516 } 1517 } 1518 } 1519 1520 // Perform any necessary transformations and dispatch. 1521 if (child == null) { 1522 handled = super.dispatchTouchEvent(transformedEvent); 1523 } else { 1524 final float offsetX = mScrollX - child.mLeft; 1525 final float offsetY = mScrollY - child.mTop; 1526 transformedEvent.offsetLocation(offsetX, offsetY); 1527 if (! child.hasIdentityMatrix()) { 1528 transformedEvent.transform(child.getInverseMatrix()); 1529 } 1530 1531 handled = child.dispatchTouchEvent(transformedEvent); 1532 } 1533 1534 // Done. 1535 transformedEvent.recycle(); 1536 return handled; 1537 } 1538 1539 /** 1540 * Enlarge the temporary pointer arrays for splitting pointers. 1541 * May discard contents (but keeps PointerCoords objects to avoid reallocating them). 1542 */ 1543 private void growTmpPointerArrays(int desiredCapacity) { 1544 final MotionEvent.PointerCoords[] oldTmpPointerCoords = mTmpPointerCoords; 1545 int capacity; 1546 if (oldTmpPointerCoords != null) { 1547 capacity = oldTmpPointerCoords.length; 1548 if (desiredCapacity <= capacity) { 1549 return; 1550 } 1551 } else { 1552 capacity = 4; 1553 } 1554 1555 while (capacity < desiredCapacity) { 1556 capacity *= 2; 1557 } 1558 1559 mTmpPointerIndexMap = new int[capacity]; 1560 mTmpPointerIds = new int[capacity]; 1561 mTmpPointerCoords = new MotionEvent.PointerCoords[capacity]; 1562 1563 if (oldTmpPointerCoords != null) { 1564 System.arraycopy(oldTmpPointerCoords, 0, mTmpPointerCoords, 0, 1565 oldTmpPointerCoords.length); 1566 } 1567 } 1568 1569 /** 1570 * Enable or disable the splitting of MotionEvents to multiple children during touch event 1571 * dispatch. This behavior is disabled by default. 1572 * 1573 * <p>When this option is enabled MotionEvents may be split and dispatched to different child 1574 * views depending on where each pointer initially went down. This allows for user interactions 1575 * such as scrolling two panes of content independently, chording of buttons, and performing 1576 * independent gestures on different pieces of content. 1577 * 1578 * @param split <code>true</code> to allow MotionEvents to be split and dispatched to multiple 1579 * child views. <code>false</code> to only allow one child view to be the target of 1580 * any MotionEvent received by this ViewGroup. 1581 */ 1582 public void setMotionEventSplittingEnabled(boolean split) { 1583 // TODO Applications really shouldn't change this setting mid-touch event, 1584 // but perhaps this should handle that case and send ACTION_CANCELs to any child views 1585 // with gestures in progress when this is changed. 1586 if (split) { 1587 mGroupFlags |= FLAG_SPLIT_MOTION_EVENTS; 1588 } else { 1589 mGroupFlags &= ~FLAG_SPLIT_MOTION_EVENTS; 1590 } 1591 } 1592 1593 /** 1594 * @return true if MotionEvents dispatched to this ViewGroup can be split to multiple children. 1595 */ 1596 public boolean isMotionEventSplittingEnabled() { 1597 return (mGroupFlags & FLAG_SPLIT_MOTION_EVENTS) == FLAG_SPLIT_MOTION_EVENTS; 1598 } 1599 1600 /** 1601 * {@inheritDoc} 1602 */ 1603 public void requestDisallowInterceptTouchEvent(boolean disallowIntercept) { 1604 1605 if (disallowIntercept == ((mGroupFlags & FLAG_DISALLOW_INTERCEPT) != 0)) { 1606 // We're already in this state, assume our ancestors are too 1607 return; 1608 } 1609 1610 if (disallowIntercept) { 1611 mGroupFlags |= FLAG_DISALLOW_INTERCEPT; 1612 } else { 1613 mGroupFlags &= ~FLAG_DISALLOW_INTERCEPT; 1614 } 1615 1616 // Pass it up to our parent 1617 if (mParent != null) { 1618 mParent.requestDisallowInterceptTouchEvent(disallowIntercept); 1619 } 1620 } 1621 1622 /** 1623 * Implement this method to intercept all touch screen motion events. This 1624 * allows you to watch events as they are dispatched to your children, and 1625 * take ownership of the current gesture at any point. 1626 * 1627 * <p>Using this function takes some care, as it has a fairly complicated 1628 * interaction with {@link View#onTouchEvent(MotionEvent) 1629 * View.onTouchEvent(MotionEvent)}, and using it requires implementing 1630 * that method as well as this one in the correct way. Events will be 1631 * received in the following order: 1632 * 1633 * <ol> 1634 * <li> You will receive the down event here. 1635 * <li> The down event will be handled either by a child of this view 1636 * group, or given to your own onTouchEvent() method to handle; this means 1637 * you should implement onTouchEvent() to return true, so you will 1638 * continue to see the rest of the gesture (instead of looking for 1639 * a parent view to handle it). Also, by returning true from 1640 * onTouchEvent(), you will not receive any following 1641 * events in onInterceptTouchEvent() and all touch processing must 1642 * happen in onTouchEvent() like normal. 1643 * <li> For as long as you return false from this function, each following 1644 * event (up to and including the final up) will be delivered first here 1645 * and then to the target's onTouchEvent(). 1646 * <li> If you return true from here, you will not receive any 1647 * following events: the target view will receive the same event but 1648 * with the action {@link MotionEvent#ACTION_CANCEL}, and all further 1649 * events will be delivered to your onTouchEvent() method and no longer 1650 * appear here. 1651 * </ol> 1652 * 1653 * @param ev The motion event being dispatched down the hierarchy. 1654 * @return Return true to steal motion events from the children and have 1655 * them dispatched to this ViewGroup through onTouchEvent(). 1656 * The current target will receive an ACTION_CANCEL event, and no further 1657 * messages will be delivered here. 1658 */ 1659 public boolean onInterceptTouchEvent(MotionEvent ev) { 1660 return false; 1661 } 1662 1663 /** 1664 * {@inheritDoc} 1665 * 1666 * Looks for a view to give focus to respecting the setting specified by 1667 * {@link #getDescendantFocusability()}. 1668 * 1669 * Uses {@link #onRequestFocusInDescendants(int, android.graphics.Rect)} to 1670 * find focus within the children of this group when appropriate. 1671 * 1672 * @see #FOCUS_BEFORE_DESCENDANTS 1673 * @see #FOCUS_AFTER_DESCENDANTS 1674 * @see #FOCUS_BLOCK_DESCENDANTS 1675 * @see #onRequestFocusInDescendants 1676 */ 1677 @Override 1678 public boolean requestFocus(int direction, Rect previouslyFocusedRect) { 1679 if (DBG) { 1680 System.out.println(this + " ViewGroup.requestFocus direction=" 1681 + direction); 1682 } 1683 int descendantFocusability = getDescendantFocusability(); 1684 1685 switch (descendantFocusability) { 1686 case FOCUS_BLOCK_DESCENDANTS: 1687 return super.requestFocus(direction, previouslyFocusedRect); 1688 case FOCUS_BEFORE_DESCENDANTS: { 1689 final boolean took = super.requestFocus(direction, previouslyFocusedRect); 1690 return took ? took : onRequestFocusInDescendants(direction, previouslyFocusedRect); 1691 } 1692 case FOCUS_AFTER_DESCENDANTS: { 1693 final boolean took = onRequestFocusInDescendants(direction, previouslyFocusedRect); 1694 return took ? took : super.requestFocus(direction, previouslyFocusedRect); 1695 } 1696 default: 1697 throw new IllegalStateException("descendant focusability must be " 1698 + "one of FOCUS_BEFORE_DESCENDANTS, FOCUS_AFTER_DESCENDANTS, FOCUS_BLOCK_DESCENDANTS " 1699 + "but is " + descendantFocusability); 1700 } 1701 } 1702 1703 /** 1704 * Look for a descendant to call {@link View#requestFocus} on. 1705 * Called by {@link ViewGroup#requestFocus(int, android.graphics.Rect)} 1706 * when it wants to request focus within its children. Override this to 1707 * customize how your {@link ViewGroup} requests focus within its children. 1708 * @param direction One of FOCUS_UP, FOCUS_DOWN, FOCUS_LEFT, and FOCUS_RIGHT 1709 * @param previouslyFocusedRect The rectangle (in this View's coordinate system) 1710 * to give a finer grained hint about where focus is coming from. May be null 1711 * if there is no hint. 1712 * @return Whether focus was taken. 1713 */ 1714 @SuppressWarnings({"ConstantConditions"}) 1715 protected boolean onRequestFocusInDescendants(int direction, 1716 Rect previouslyFocusedRect) { 1717 int index; 1718 int increment; 1719 int end; 1720 int count = mChildrenCount; 1721 if ((direction & FOCUS_FORWARD) != 0) { 1722 index = 0; 1723 increment = 1; 1724 end = count; 1725 } else { 1726 index = count - 1; 1727 increment = -1; 1728 end = -1; 1729 } 1730 final View[] children = mChildren; 1731 for (int i = index; i != end; i += increment) { 1732 View child = children[i]; 1733 if ((child.mViewFlags & VISIBILITY_MASK) == VISIBLE) { 1734 if (child.requestFocus(direction, previouslyFocusedRect)) { 1735 return true; 1736 } 1737 } 1738 } 1739 return false; 1740 } 1741 1742 /** 1743 * {@inheritDoc} 1744 * 1745 * @hide 1746 */ 1747 @Override 1748 public void dispatchStartTemporaryDetach() { 1749 super.dispatchStartTemporaryDetach(); 1750 final int count = mChildrenCount; 1751 final View[] children = mChildren; 1752 for (int i = 0; i < count; i++) { 1753 children[i].dispatchStartTemporaryDetach(); 1754 } 1755 } 1756 1757 /** 1758 * {@inheritDoc} 1759 * 1760 * @hide 1761 */ 1762 @Override 1763 public void dispatchFinishTemporaryDetach() { 1764 super.dispatchFinishTemporaryDetach(); 1765 final int count = mChildrenCount; 1766 final View[] children = mChildren; 1767 for (int i = 0; i < count; i++) { 1768 children[i].dispatchFinishTemporaryDetach(); 1769 } 1770 } 1771 1772 /** 1773 * {@inheritDoc} 1774 */ 1775 @Override 1776 void dispatchAttachedToWindow(AttachInfo info, int visibility) { 1777 super.dispatchAttachedToWindow(info, visibility); 1778 visibility |= mViewFlags & VISIBILITY_MASK; 1779 final int count = mChildrenCount; 1780 final View[] children = mChildren; 1781 for (int i = 0; i < count; i++) { 1782 children[i].dispatchAttachedToWindow(info, visibility); 1783 } 1784 } 1785 1786 @Override 1787 public boolean dispatchPopulateAccessibilityEvent(AccessibilityEvent event) { 1788 boolean populated = false; 1789 for (int i = 0, count = getChildCount(); i < count; i++) { 1790 populated |= getChildAt(i).dispatchPopulateAccessibilityEvent(event); 1791 } 1792 return populated; 1793 } 1794 1795 /** 1796 * {@inheritDoc} 1797 */ 1798 @Override 1799 void dispatchDetachedFromWindow() { 1800 // If we still have a touch target, we are still in the process of 1801 // dispatching motion events to a child; we need to get rid of that 1802 // child to avoid dispatching events to it after the window is torn 1803 // down. To make sure we keep the child in a consistent state, we 1804 // first send it an ACTION_CANCEL motion event. 1805 cancelAndClearTouchTargets(null); 1806 1807 final int count = mChildrenCount; 1808 final View[] children = mChildren; 1809 for (int i = 0; i < count; i++) { 1810 children[i].dispatchDetachedFromWindow(); 1811 } 1812 super.dispatchDetachedFromWindow(); 1813 } 1814 1815 /** 1816 * {@inheritDoc} 1817 */ 1818 @Override 1819 public void setPadding(int left, int top, int right, int bottom) { 1820 super.setPadding(left, top, right, bottom); 1821 1822 if ((mPaddingLeft | mPaddingTop | mPaddingRight | mPaddingRight) != 0) { 1823 mGroupFlags |= FLAG_PADDING_NOT_NULL; 1824 } else { 1825 mGroupFlags &= ~FLAG_PADDING_NOT_NULL; 1826 } 1827 } 1828 1829 /** 1830 * {@inheritDoc} 1831 */ 1832 @Override 1833 protected void dispatchSaveInstanceState(SparseArray<Parcelable> container) { 1834 super.dispatchSaveInstanceState(container); 1835 final int count = mChildrenCount; 1836 final View[] children = mChildren; 1837 for (int i = 0; i < count; i++) { 1838 View c = children[i]; 1839 if ((c.mViewFlags & PARENT_SAVE_DISABLED_MASK) != PARENT_SAVE_DISABLED) { 1840 c.dispatchSaveInstanceState(container); 1841 } 1842 } 1843 } 1844 1845 /** 1846 * Perform dispatching of a {@link #saveHierarchyState freeze()} to only this view, 1847 * not to its children. For use when overriding 1848 * {@link #dispatchSaveInstanceState dispatchFreeze()} to allow subclasses to freeze 1849 * their own state but not the state of their children. 1850 * 1851 * @param container the container 1852 */ 1853 protected void dispatchFreezeSelfOnly(SparseArray<Parcelable> container) { 1854 super.dispatchSaveInstanceState(container); 1855 } 1856 1857 /** 1858 * {@inheritDoc} 1859 */ 1860 @Override 1861 protected void dispatchRestoreInstanceState(SparseArray<Parcelable> container) { 1862 super.dispatchRestoreInstanceState(container); 1863 final int count = mChildrenCount; 1864 final View[] children = mChildren; 1865 for (int i = 0; i < count; i++) { 1866 View c = children[i]; 1867 if ((c.mViewFlags & PARENT_SAVE_DISABLED_MASK) != PARENT_SAVE_DISABLED) { 1868 c.dispatchRestoreInstanceState(container); 1869 } 1870 } 1871 } 1872 1873 /** 1874 * Perform dispatching of a {@link #restoreHierarchyState thaw()} to only this view, 1875 * not to its children. For use when overriding 1876 * {@link #dispatchRestoreInstanceState dispatchThaw()} to allow subclasses to thaw 1877 * their own state but not the state of their children. 1878 * 1879 * @param container the container 1880 */ 1881 protected void dispatchThawSelfOnly(SparseArray<Parcelable> container) { 1882 super.dispatchRestoreInstanceState(container); 1883 } 1884 1885 /** 1886 * Enables or disables the drawing cache for each child of this view group. 1887 * 1888 * @param enabled true to enable the cache, false to dispose of it 1889 */ 1890 protected void setChildrenDrawingCacheEnabled(boolean enabled) { 1891 if (enabled || (mPersistentDrawingCache & PERSISTENT_ALL_CACHES) != PERSISTENT_ALL_CACHES) { 1892 final View[] children = mChildren; 1893 final int count = mChildrenCount; 1894 for (int i = 0; i < count; i++) { 1895 children[i].setDrawingCacheEnabled(enabled); 1896 } 1897 } 1898 } 1899 1900 @Override 1901 protected void onAnimationStart() { 1902 super.onAnimationStart(); 1903 1904 // When this ViewGroup's animation starts, build the cache for the children 1905 if ((mGroupFlags & FLAG_ANIMATION_CACHE) == FLAG_ANIMATION_CACHE) { 1906 final int count = mChildrenCount; 1907 final View[] children = mChildren; 1908 final boolean buildCache = !isHardwareAccelerated(); 1909 1910 for (int i = 0; i < count; i++) { 1911 final View child = children[i]; 1912 if ((child.mViewFlags & VISIBILITY_MASK) == VISIBLE) { 1913 child.setDrawingCacheEnabled(true); 1914 if (buildCache) { 1915 child.buildDrawingCache(true); 1916 } 1917 } 1918 } 1919 1920 mGroupFlags |= FLAG_CHILDREN_DRAWN_WITH_CACHE; 1921 } 1922 } 1923 1924 @Override 1925 protected void onAnimationEnd() { 1926 super.onAnimationEnd(); 1927 1928 // When this ViewGroup's animation ends, destroy the cache of the children 1929 if ((mGroupFlags & FLAG_ANIMATION_CACHE) == FLAG_ANIMATION_CACHE) { 1930 mGroupFlags &= ~FLAG_CHILDREN_DRAWN_WITH_CACHE; 1931 1932 if ((mPersistentDrawingCache & PERSISTENT_ANIMATION_CACHE) == 0) { 1933 setChildrenDrawingCacheEnabled(false); 1934 } 1935 } 1936 } 1937 1938 @Override 1939 Bitmap createSnapshot(Bitmap.Config quality, int backgroundColor, boolean skipChildren) { 1940 int count = mChildrenCount; 1941 int[] visibilities = null; 1942 1943 if (skipChildren) { 1944 visibilities = new int[count]; 1945 for (int i = 0; i < count; i++) { 1946 View child = getChildAt(i); 1947 visibilities[i] = child.getVisibility(); 1948 if (visibilities[i] == View.VISIBLE) { 1949 child.setVisibility(INVISIBLE); 1950 } 1951 } 1952 } 1953 1954 Bitmap b = super.createSnapshot(quality, backgroundColor, skipChildren); 1955 1956 if (skipChildren) { 1957 for (int i = 0; i < count; i++) { 1958 getChildAt(i).setVisibility(visibilities[i]); 1959 } 1960 } 1961 1962 return b; 1963 } 1964 1965 /** 1966 * {@inheritDoc} 1967 */ 1968 @Override 1969 protected void dispatchDraw(Canvas canvas) { 1970 final int count = mChildrenCount; 1971 final View[] children = mChildren; 1972 int flags = mGroupFlags; 1973 1974 if ((flags & FLAG_RUN_ANIMATION) != 0 && canAnimate()) { 1975 final boolean cache = (mGroupFlags & FLAG_ANIMATION_CACHE) == FLAG_ANIMATION_CACHE; 1976 1977 final boolean buildCache = !isHardwareAccelerated(); 1978 for (int i = 0; i < count; i++) { 1979 final View child = children[i]; 1980 if ((child.mViewFlags & VISIBILITY_MASK) == VISIBLE) { 1981 final LayoutParams params = child.getLayoutParams(); 1982 attachLayoutAnimationParameters(child, params, i, count); 1983 bindLayoutAnimation(child); 1984 if (cache) { 1985 child.setDrawingCacheEnabled(true); 1986 if (buildCache) { 1987 child.buildDrawingCache(true); 1988 } 1989 } 1990 } 1991 } 1992 1993 final LayoutAnimationController controller = mLayoutAnimationController; 1994 if (controller.willOverlap()) { 1995 mGroupFlags |= FLAG_OPTIMIZE_INVALIDATE; 1996 } 1997 1998 controller.start(); 1999 2000 mGroupFlags &= ~FLAG_RUN_ANIMATION; 2001 mGroupFlags &= ~FLAG_ANIMATION_DONE; 2002 2003 if (cache) { 2004 mGroupFlags |= FLAG_CHILDREN_DRAWN_WITH_CACHE; 2005 } 2006 2007 if (mAnimationListener != null) { 2008 mAnimationListener.onAnimationStart(controller.getAnimation()); 2009 } 2010 } 2011 2012 int saveCount = 0; 2013 final boolean clipToPadding = (flags & CLIP_TO_PADDING_MASK) == CLIP_TO_PADDING_MASK; 2014 if (clipToPadding) { 2015 saveCount = canvas.save(); 2016 canvas.clipRect(mScrollX + mPaddingLeft, mScrollY + mPaddingTop, 2017 mScrollX + mRight - mLeft - mPaddingRight, 2018 mScrollY + mBottom - mTop - mPaddingBottom); 2019 2020 } 2021 2022 // We will draw our child's animation, let's reset the flag 2023 mPrivateFlags &= ~DRAW_ANIMATION; 2024 mGroupFlags &= ~FLAG_INVALIDATE_REQUIRED; 2025 2026 boolean more = false; 2027 final long drawingTime = getDrawingTime(); 2028 2029 if ((flags & FLAG_USE_CHILD_DRAWING_ORDER) == 0) { 2030 for (int i = 0; i < count; i++) { 2031 final View child = children[i]; 2032 if ((child.mViewFlags & VISIBILITY_MASK) == VISIBLE || child.getAnimation() != null) { 2033 more |= drawChild(canvas, child, drawingTime); 2034 } 2035 } 2036 } else { 2037 for (int i = 0; i < count; i++) { 2038 final View child = children[getChildDrawingOrder(count, i)]; 2039 if ((child.mViewFlags & VISIBILITY_MASK) == VISIBLE || child.getAnimation() != null) { 2040 more |= drawChild(canvas, child, drawingTime); 2041 } 2042 } 2043 } 2044 2045 // Draw any disappearing views that have animations 2046 if (mDisappearingChildren != null) { 2047 final ArrayList<View> disappearingChildren = mDisappearingChildren; 2048 final int disappearingCount = disappearingChildren.size() - 1; 2049 // Go backwards -- we may delete as animations finish 2050 for (int i = disappearingCount; i >= 0; i--) { 2051 final View child = disappearingChildren.get(i); 2052 more |= drawChild(canvas, child, drawingTime); 2053 } 2054 } 2055 2056 if (clipToPadding) { 2057 canvas.restoreToCount(saveCount); 2058 } 2059 2060 // mGroupFlags might have been updated by drawChild() 2061 flags = mGroupFlags; 2062 2063 if ((flags & FLAG_INVALIDATE_REQUIRED) == FLAG_INVALIDATE_REQUIRED) { 2064 invalidate(); 2065 } 2066 2067 if ((flags & FLAG_ANIMATION_DONE) == 0 && (flags & FLAG_NOTIFY_ANIMATION_LISTENER) == 0 && 2068 mLayoutAnimationController.isDone() && !more) { 2069 // We want to erase the drawing cache and notify the listener after the 2070 // next frame is drawn because one extra invalidate() is caused by 2071 // drawChild() after the animation is over 2072 mGroupFlags |= FLAG_NOTIFY_ANIMATION_LISTENER; 2073 final Runnable end = new Runnable() { 2074 public void run() { 2075 notifyAnimationListener(); 2076 } 2077 }; 2078 post(end); 2079 } 2080 } 2081 2082 /** 2083 * Returns the index of the child to draw for this iteration. Override this 2084 * if you want to change the drawing order of children. By default, it 2085 * returns i. 2086 * <p> 2087 * NOTE: In order for this method to be called, you must enable child ordering 2088 * first by calling {@link #setChildrenDrawingOrderEnabled(boolean)}. 2089 * 2090 * @param i The current iteration. 2091 * @return The index of the child to draw this iteration. 2092 * 2093 * @see #setChildrenDrawingOrderEnabled(boolean) 2094 * @see #isChildrenDrawingOrderEnabled() 2095 */ 2096 protected int getChildDrawingOrder(int childCount, int i) { 2097 return i; 2098 } 2099 2100 private void notifyAnimationListener() { 2101 mGroupFlags &= ~FLAG_NOTIFY_ANIMATION_LISTENER; 2102 mGroupFlags |= FLAG_ANIMATION_DONE; 2103 2104 if (mAnimationListener != null) { 2105 final Runnable end = new Runnable() { 2106 public void run() { 2107 mAnimationListener.onAnimationEnd(mLayoutAnimationController.getAnimation()); 2108 } 2109 }; 2110 post(end); 2111 } 2112 2113 if ((mGroupFlags & FLAG_ANIMATION_CACHE) == FLAG_ANIMATION_CACHE) { 2114 mGroupFlags &= ~FLAG_CHILDREN_DRAWN_WITH_CACHE; 2115 if ((mPersistentDrawingCache & PERSISTENT_ANIMATION_CACHE) == 0) { 2116 setChildrenDrawingCacheEnabled(false); 2117 } 2118 } 2119 2120 invalidate(); 2121 } 2122 2123 /** 2124 * Draw one child of this View Group. This method is responsible for getting 2125 * the canvas in the right state. This includes clipping, translating so 2126 * that the child's scrolled origin is at 0, 0, and applying any animation 2127 * transformations. 2128 * 2129 * @param canvas The canvas on which to draw the child 2130 * @param child Who to draw 2131 * @param drawingTime The time at which draw is occuring 2132 * @return True if an invalidate() was issued 2133 */ 2134 protected boolean drawChild(Canvas canvas, View child, long drawingTime) { 2135 boolean more = false; 2136 2137 final int cl = child.mLeft; 2138 final int ct = child.mTop; 2139 final int cr = child.mRight; 2140 final int cb = child.mBottom; 2141 2142 final boolean childHasIdentityMatrix = child.hasIdentityMatrix(); 2143 2144 final int flags = mGroupFlags; 2145 2146 if ((flags & FLAG_CLEAR_TRANSFORMATION) == FLAG_CLEAR_TRANSFORMATION) { 2147 mChildTransformation.clear(); 2148 mGroupFlags &= ~FLAG_CLEAR_TRANSFORMATION; 2149 } 2150 2151 Transformation transformToApply = null; 2152 Transformation invalidationTransform; 2153 final Animation a = child.getAnimation(); 2154 boolean concatMatrix = false; 2155 2156 boolean scalingRequired = false; 2157 boolean caching = false; 2158 if ((flags & FLAG_CHILDREN_DRAWN_WITH_CACHE) == FLAG_CHILDREN_DRAWN_WITH_CACHE || 2159 (flags & FLAG_ALWAYS_DRAWN_WITH_CACHE) == FLAG_ALWAYS_DRAWN_WITH_CACHE) { 2160 caching = true; 2161 if (mAttachInfo != null) scalingRequired = mAttachInfo.mScalingRequired; 2162 } 2163 2164 if (a != null) { 2165 final boolean initialized = a.isInitialized(); 2166 if (!initialized) { 2167 a.initialize(cr - cl, cb - ct, getWidth(), getHeight()); 2168 a.initializeInvalidateRegion(0, 0, cr - cl, cb - ct); 2169 child.onAnimationStart(); 2170 } 2171 2172 more = a.getTransformation(drawingTime, mChildTransformation, 2173 scalingRequired ? mAttachInfo.mApplicationScale : 1f); 2174 if (scalingRequired && mAttachInfo.mApplicationScale != 1f) { 2175 if (mInvalidationTransformation == null) { 2176 mInvalidationTransformation = new Transformation(); 2177 } 2178 invalidationTransform = mInvalidationTransformation; 2179 a.getTransformation(drawingTime, invalidationTransform, 1f); 2180 } else { 2181 invalidationTransform = mChildTransformation; 2182 } 2183 transformToApply = mChildTransformation; 2184 2185 concatMatrix = a.willChangeTransformationMatrix(); 2186 2187 if (more) { 2188 if (!a.willChangeBounds()) { 2189 if ((flags & (FLAG_OPTIMIZE_INVALIDATE | FLAG_ANIMATION_DONE)) == 2190 FLAG_OPTIMIZE_INVALIDATE) { 2191 mGroupFlags |= FLAG_INVALIDATE_REQUIRED; 2192 } else if ((flags & FLAG_INVALIDATE_REQUIRED) == 0) { 2193 // The child need to draw an animation, potentially offscreen, so 2194 // make sure we do not cancel invalidate requests 2195 mPrivateFlags |= DRAW_ANIMATION; 2196 invalidate(cl, ct, cr, cb); 2197 } 2198 } else { 2199 if (mInvalidateRegion == null) { 2200 mInvalidateRegion = new RectF(); 2201 } 2202 final RectF region = mInvalidateRegion; 2203 a.getInvalidateRegion(0, 0, cr - cl, cb - ct, region, invalidationTransform); 2204 2205 // The child need to draw an animation, potentially offscreen, so 2206 // make sure we do not cancel invalidate requests 2207 mPrivateFlags |= DRAW_ANIMATION; 2208 2209 final int left = cl + (int) region.left; 2210 final int top = ct + (int) region.top; 2211 invalidate(left, top, left + (int) region.width(), top + (int) region.height()); 2212 } 2213 } 2214 } else if ((flags & FLAG_SUPPORT_STATIC_TRANSFORMATIONS) == 2215 FLAG_SUPPORT_STATIC_TRANSFORMATIONS) { 2216 final boolean hasTransform = getChildStaticTransformation(child, mChildTransformation); 2217 if (hasTransform) { 2218 final int transformType = mChildTransformation.getTransformationType(); 2219 transformToApply = transformType != Transformation.TYPE_IDENTITY ? 2220 mChildTransformation : null; 2221 concatMatrix = (transformType & Transformation.TYPE_MATRIX) != 0; 2222 } 2223 } 2224 2225 concatMatrix |= !childHasIdentityMatrix; 2226 2227 // Sets the flag as early as possible to allow draw() implementations 2228 // to call invalidate() successfully when doing animations 2229 child.mPrivateFlags |= DRAWN; 2230 2231 if (!concatMatrix && canvas.quickReject(cl, ct, cr, cb, Canvas.EdgeType.BW) && 2232 (child.mPrivateFlags & DRAW_ANIMATION) == 0) { 2233 return more; 2234 } 2235 2236 float alpha = child.getAlpha(); 2237 // Bail out early if the view does not need to be drawn 2238 if (alpha <= ViewConfiguration.ALPHA_THRESHOLD && (child.mPrivateFlags & ALPHA_SET) == 0 && 2239 !(child instanceof SurfaceView)) { 2240 return more; 2241 } 2242 2243 child.computeScroll(); 2244 2245 final int sx = child.mScrollX; 2246 final int sy = child.mScrollY; 2247 2248 DisplayList displayList = null; 2249 Bitmap cache = null; 2250 if (caching) { 2251 if (!canvas.isHardwareAccelerated()) { 2252 cache = child.getDrawingCache(true); 2253 } else { 2254 displayList = child.getDisplayList(); 2255 } 2256 } 2257 2258 final boolean hasDisplayList = displayList != null && displayList.isReady(); 2259 final boolean hasNoCache = cache == null || hasDisplayList; 2260 2261 final int restoreTo = canvas.save(); 2262 if (hasNoCache) { 2263 canvas.translate(cl - sx, ct - sy); 2264 } else { 2265 canvas.translate(cl, ct); 2266 if (scalingRequired) { 2267 // mAttachInfo cannot be null, otherwise scalingRequired == false 2268 final float scale = 1.0f / mAttachInfo.mApplicationScale; 2269 canvas.scale(scale, scale); 2270 } 2271 } 2272 2273 if (transformToApply != null || alpha < 1.0f || !child.hasIdentityMatrix()) { 2274 if (transformToApply != null || !childHasIdentityMatrix) { 2275 int transX = 0; 2276 int transY = 0; 2277 2278 if (hasNoCache) { 2279 transX = -sx; 2280 transY = -sy; 2281 } 2282 2283 if (transformToApply != null) { 2284 if (concatMatrix) { 2285 // Undo the scroll translation, apply the transformation matrix, 2286 // then redo the scroll translate to get the correct result. 2287 canvas.translate(-transX, -transY); 2288 canvas.concat(transformToApply.getMatrix()); 2289 canvas.translate(transX, transY); 2290 mGroupFlags |= FLAG_CLEAR_TRANSFORMATION; 2291 } 2292 2293 float transformAlpha = transformToApply.getAlpha(); 2294 if (transformAlpha < 1.0f) { 2295 alpha *= transformToApply.getAlpha(); 2296 mGroupFlags |= FLAG_CLEAR_TRANSFORMATION; 2297 } 2298 } 2299 2300 if (!childHasIdentityMatrix) { 2301 canvas.translate(-transX, -transY); 2302 canvas.concat(child.getMatrix()); 2303 canvas.translate(transX, transY); 2304 } 2305 } 2306 2307 if (alpha < 1.0f) { 2308 mGroupFlags |= FLAG_CLEAR_TRANSFORMATION; 2309 if (hasNoCache) { 2310 final int multipliedAlpha = (int) (255 * alpha); 2311 if (!child.onSetAlpha(multipliedAlpha)) { 2312 int layerFlags = Canvas.HAS_ALPHA_LAYER_SAVE_FLAG; 2313 if ((flags & FLAG_CLIP_CHILDREN) == FLAG_CLIP_CHILDREN) { 2314 layerFlags |= Canvas.CLIP_TO_LAYER_SAVE_FLAG; 2315 } 2316 canvas.saveLayerAlpha(sx, sy, sx + cr - cl, sy + cb - ct, multipliedAlpha, 2317 layerFlags); 2318 } else { 2319 child.mPrivateFlags |= ALPHA_SET; 2320 } 2321 } 2322 } 2323 } else if ((child.mPrivateFlags & ALPHA_SET) == ALPHA_SET) { 2324 child.onSetAlpha(255); 2325 child.mPrivateFlags &= ~ALPHA_SET; 2326 } 2327 2328 if ((flags & FLAG_CLIP_CHILDREN) == FLAG_CLIP_CHILDREN) { 2329 if (hasNoCache) { 2330 canvas.clipRect(sx, sy, sx + (cr - cl), sy + (cb - ct)); 2331 } else { 2332 if (!scalingRequired) { 2333 canvas.clipRect(0, 0, cr - cl, cb - ct); 2334 } else { 2335 canvas.clipRect(0, 0, cache.getWidth(), cache.getHeight()); 2336 } 2337 } 2338 } 2339 2340 if (hasNoCache) { 2341 if (!hasDisplayList) { 2342 // Fast path for layouts with no backgrounds 2343 if ((child.mPrivateFlags & SKIP_DRAW) == SKIP_DRAW) { 2344 if (ViewDebug.TRACE_HIERARCHY) { 2345 ViewDebug.trace(this, ViewDebug.HierarchyTraceType.DRAW); 2346 } 2347 child.mPrivateFlags &= ~DIRTY_MASK; 2348 child.dispatchDraw(canvas); 2349 } else { 2350 child.draw(canvas); 2351 } 2352 } else { 2353 child.mPrivateFlags &= ~DIRTY_MASK; 2354 ((HardwareCanvas) canvas).drawDisplayList(displayList); 2355 } 2356 } else if (cache != null) { 2357 child.mPrivateFlags &= ~DIRTY_MASK; 2358 final Paint cachePaint = mCachePaint; 2359 if (alpha < 1.0f) { 2360 cachePaint.setAlpha((int) (alpha * 255)); 2361 mGroupFlags |= FLAG_ALPHA_LOWER_THAN_ONE; 2362 } else if ((flags & FLAG_ALPHA_LOWER_THAN_ONE) == FLAG_ALPHA_LOWER_THAN_ONE) { 2363 cachePaint.setAlpha(255); 2364 mGroupFlags &= ~FLAG_ALPHA_LOWER_THAN_ONE; 2365 } 2366 canvas.drawBitmap(cache, 0.0f, 0.0f, cachePaint); 2367 } 2368 2369 canvas.restoreToCount(restoreTo); 2370 2371 if (a != null && !more) { 2372 child.onSetAlpha(255); 2373 finishAnimatingView(child, a); 2374 } 2375 2376 return more; 2377 } 2378 2379 /** 2380 * By default, children are clipped to their bounds before drawing. This 2381 * allows view groups to override this behavior for animations, etc. 2382 * 2383 * @param clipChildren true to clip children to their bounds, 2384 * false otherwise 2385 * @attr ref android.R.styleable#ViewGroup_clipChildren 2386 */ 2387 public void setClipChildren(boolean clipChildren) { 2388 setBooleanFlag(FLAG_CLIP_CHILDREN, clipChildren); 2389 } 2390 2391 /** 2392 * By default, children are clipped to the padding of the ViewGroup. This 2393 * allows view groups to override this behavior 2394 * 2395 * @param clipToPadding true to clip children to the padding of the 2396 * group, false otherwise 2397 * @attr ref android.R.styleable#ViewGroup_clipToPadding 2398 */ 2399 public void setClipToPadding(boolean clipToPadding) { 2400 setBooleanFlag(FLAG_CLIP_TO_PADDING, clipToPadding); 2401 } 2402 2403 /** 2404 * {@inheritDoc} 2405 */ 2406 @Override 2407 public void dispatchSetSelected(boolean selected) { 2408 final View[] children = mChildren; 2409 final int count = mChildrenCount; 2410 for (int i = 0; i < count; i++) { 2411 2412 children[i].setSelected(selected); 2413 } 2414 } 2415 2416 /** 2417 * {@inheritDoc} 2418 */ 2419 @Override 2420 public void dispatchSetActivated(boolean activated) { 2421 final View[] children = mChildren; 2422 final int count = mChildrenCount; 2423 for (int i = 0; i < count; i++) { 2424 2425 children[i].setActivated(activated); 2426 } 2427 } 2428 2429 @Override 2430 protected void dispatchSetPressed(boolean pressed) { 2431 final View[] children = mChildren; 2432 final int count = mChildrenCount; 2433 for (int i = 0; i < count; i++) { 2434 children[i].setPressed(pressed); 2435 } 2436 } 2437 2438 /** 2439 * When this property is set to true, this ViewGroup supports static transformations on 2440 * children; this causes 2441 * {@link #getChildStaticTransformation(View, android.view.animation.Transformation)} to be 2442 * invoked when a child is drawn. 2443 * 2444 * Any subclass overriding 2445 * {@link #getChildStaticTransformation(View, android.view.animation.Transformation)} should 2446 * set this property to true. 2447 * 2448 * @param enabled True to enable static transformations on children, false otherwise. 2449 * 2450 * @see #FLAG_SUPPORT_STATIC_TRANSFORMATIONS 2451 */ 2452 protected void setStaticTransformationsEnabled(boolean enabled) { 2453 setBooleanFlag(FLAG_SUPPORT_STATIC_TRANSFORMATIONS, enabled); 2454 } 2455 2456 /** 2457 * {@inheritDoc} 2458 * 2459 * @see #setStaticTransformationsEnabled(boolean) 2460 */ 2461 protected boolean getChildStaticTransformation(View child, Transformation t) { 2462 return false; 2463 } 2464 2465 /** 2466 * {@hide} 2467 */ 2468 @Override 2469 protected View findViewTraversal(int id) { 2470 if (id == mID) { 2471 return this; 2472 } 2473 2474 final View[] where = mChildren; 2475 final int len = mChildrenCount; 2476 2477 for (int i = 0; i < len; i++) { 2478 View v = where[i]; 2479 2480 if ((v.mPrivateFlags & IS_ROOT_NAMESPACE) == 0) { 2481 v = v.findViewById(id); 2482 2483 if (v != null) { 2484 return v; 2485 } 2486 } 2487 } 2488 2489 return null; 2490 } 2491 2492 /** 2493 * {@hide} 2494 */ 2495 @Override 2496 protected View findViewWithTagTraversal(Object tag) { 2497 if (tag != null && tag.equals(mTag)) { 2498 return this; 2499 } 2500 2501 final View[] where = mChildren; 2502 final int len = mChildrenCount; 2503 2504 for (int i = 0; i < len; i++) { 2505 View v = where[i]; 2506 2507 if ((v.mPrivateFlags & IS_ROOT_NAMESPACE) == 0) { 2508 v = v.findViewWithTag(tag); 2509 2510 if (v != null) { 2511 return v; 2512 } 2513 } 2514 } 2515 2516 return null; 2517 } 2518 2519 /** 2520 * {@hide} 2521 */ 2522 @Override 2523 protected View findViewByPredicateTraversal(Predicate<View> predicate) { 2524 if (predicate.apply(this)) { 2525 return this; 2526 } 2527 2528 final View[] where = mChildren; 2529 final int len = mChildrenCount; 2530 2531 for (int i = 0; i < len; i++) { 2532 View v = where[i]; 2533 2534 if ((v.mPrivateFlags & IS_ROOT_NAMESPACE) == 0) { 2535 v = v.findViewByPredicate(predicate); 2536 2537 if (v != null) { 2538 return v; 2539 } 2540 } 2541 } 2542 2543 return null; 2544 } 2545 2546 /** 2547 * Adds a child view. If no layout parameters are already set on the child, the 2548 * default parameters for this ViewGroup are set on the child. 2549 * 2550 * @param child the child view to add 2551 * 2552 * @see #generateDefaultLayoutParams() 2553 */ 2554 public void addView(View child) { 2555 addView(child, -1); 2556 } 2557 2558 /** 2559 * Adds a child view. If no layout parameters are already set on the child, the 2560 * default parameters for this ViewGroup are set on the child. 2561 * 2562 * @param child the child view to add 2563 * @param index the position at which to add the child 2564 * 2565 * @see #generateDefaultLayoutParams() 2566 */ 2567 public void addView(View child, int index) { 2568 LayoutParams params = child.getLayoutParams(); 2569 if (params == null) { 2570 params = generateDefaultLayoutParams(); 2571 if (params == null) { 2572 throw new IllegalArgumentException("generateDefaultLayoutParams() cannot return null"); 2573 } 2574 } 2575 addView(child, index, params); 2576 } 2577 2578 /** 2579 * Adds a child view with this ViewGroup's default layout parameters and the 2580 * specified width and height. 2581 * 2582 * @param child the child view to add 2583 */ 2584 public void addView(View child, int width, int height) { 2585 final LayoutParams params = generateDefaultLayoutParams(); 2586 params.width = width; 2587 params.height = height; 2588 addView(child, -1, params); 2589 } 2590 2591 /** 2592 * Adds a child view with the specified layout parameters. 2593 * 2594 * @param child the child view to add 2595 * @param params the layout parameters to set on the child 2596 */ 2597 public void addView(View child, LayoutParams params) { 2598 addView(child, -1, params); 2599 } 2600 2601 /** 2602 * Adds a child view with the specified layout parameters. 2603 * 2604 * @param child the child view to add 2605 * @param index the position at which to add the child 2606 * @param params the layout parameters to set on the child 2607 */ 2608 public void addView(View child, int index, LayoutParams params) { 2609 if (DBG) { 2610 System.out.println(this + " addView"); 2611 } 2612 2613 // addViewInner() will call child.requestLayout() when setting the new LayoutParams 2614 // therefore, we call requestLayout() on ourselves before, so that the child's request 2615 // will be blocked at our level 2616 child.mPrivateFlags &= ~DIRTY_MASK; 2617 requestLayout(); 2618 invalidate(); 2619 addViewInner(child, index, params, false); 2620 } 2621 2622 /** 2623 * {@inheritDoc} 2624 */ 2625 public void updateViewLayout(View view, ViewGroup.LayoutParams params) { 2626 if (!checkLayoutParams(params)) { 2627 throw new IllegalArgumentException("Invalid LayoutParams supplied to " + this); 2628 } 2629 if (view.mParent != this) { 2630 throw new IllegalArgumentException("Given view not a child of " + this); 2631 } 2632 view.setLayoutParams(params); 2633 } 2634 2635 /** 2636 * {@inheritDoc} 2637 */ 2638 protected boolean checkLayoutParams(ViewGroup.LayoutParams p) { 2639 return p != null; 2640 } 2641 2642 /** 2643 * Interface definition for a callback to be invoked when the hierarchy 2644 * within this view changed. The hierarchy changes whenever a child is added 2645 * to or removed from this view. 2646 */ 2647 public interface OnHierarchyChangeListener { 2648 /** 2649 * Called when a new child is added to a parent view. 2650 * 2651 * @param parent the view in which a child was added 2652 * @param child the new child view added in the hierarchy 2653 */ 2654 void onChildViewAdded(View parent, View child); 2655 2656 /** 2657 * Called when a child is removed from a parent view. 2658 * 2659 * @param parent the view from which the child was removed 2660 * @param child the child removed from the hierarchy 2661 */ 2662 void onChildViewRemoved(View parent, View child); 2663 } 2664 2665 /** 2666 * Register a callback to be invoked when a child is added to or removed 2667 * from this view. 2668 * 2669 * @param listener the callback to invoke on hierarchy change 2670 */ 2671 public void setOnHierarchyChangeListener(OnHierarchyChangeListener listener) { 2672 mOnHierarchyChangeListener = listener; 2673 } 2674 2675 /** 2676 * Adds a view during layout. This is useful if in your onLayout() method, 2677 * you need to add more views (as does the list view for example). 2678 * 2679 * If index is negative, it means put it at the end of the list. 2680 * 2681 * @param child the view to add to the group 2682 * @param index the index at which the child must be added 2683 * @param params the layout parameters to associate with the child 2684 * @return true if the child was added, false otherwise 2685 */ 2686 protected boolean addViewInLayout(View child, int index, LayoutParams params) { 2687 return addViewInLayout(child, index, params, false); 2688 } 2689 2690 /** 2691 * Adds a view during layout. This is useful if in your onLayout() method, 2692 * you need to add more views (as does the list view for example). 2693 * 2694 * If index is negative, it means put it at the end of the list. 2695 * 2696 * @param child the view to add to the group 2697 * @param index the index at which the child must be added 2698 * @param params the layout parameters to associate with the child 2699 * @param preventRequestLayout if true, calling this method will not trigger a 2700 * layout request on child 2701 * @return true if the child was added, false otherwise 2702 */ 2703 protected boolean addViewInLayout(View child, int index, LayoutParams params, 2704 boolean preventRequestLayout) { 2705 child.mParent = null; 2706 addViewInner(child, index, params, preventRequestLayout); 2707 child.mPrivateFlags = (child.mPrivateFlags & ~DIRTY_MASK) | DRAWN; 2708 return true; 2709 } 2710 2711 /** 2712 * Prevents the specified child to be laid out during the next layout pass. 2713 * 2714 * @param child the child on which to perform the cleanup 2715 */ 2716 protected void cleanupLayoutState(View child) { 2717 child.mPrivateFlags &= ~View.FORCE_LAYOUT; 2718 } 2719 2720 private void addViewInner(View child, int index, LayoutParams params, 2721 boolean preventRequestLayout) { 2722 2723 if (child.getParent() != null) { 2724 throw new IllegalStateException("The specified child already has a parent. " + 2725 "You must call removeView() on the child's parent first."); 2726 } 2727 2728 if (mTransition != null) { 2729 mTransition.addChild(this, child); 2730 } 2731 2732 if (!checkLayoutParams(params)) { 2733 params = generateLayoutParams(params); 2734 } 2735 2736 if (preventRequestLayout) { 2737 child.mLayoutParams = params; 2738 } else { 2739 child.setLayoutParams(params); 2740 } 2741 2742 if (index < 0) { 2743 index = mChildrenCount; 2744 } 2745 2746 addInArray(child, index); 2747 2748 // tell our children 2749 if (preventRequestLayout) { 2750 child.assignParent(this); 2751 } else { 2752 child.mParent = this; 2753 } 2754 2755 if (child.hasFocus()) { 2756 requestChildFocus(child, child.findFocus()); 2757 } 2758 2759 AttachInfo ai = mAttachInfo; 2760 if (ai != null) { 2761 boolean lastKeepOn = ai.mKeepScreenOn; 2762 ai.mKeepScreenOn = false; 2763 child.dispatchAttachedToWindow(mAttachInfo, (mViewFlags&VISIBILITY_MASK)); 2764 if (ai.mKeepScreenOn) { 2765 needGlobalAttributesUpdate(true); 2766 } 2767 ai.mKeepScreenOn = lastKeepOn; 2768 } 2769 2770 if (mOnHierarchyChangeListener != null) { 2771 mOnHierarchyChangeListener.onChildViewAdded(this, child); 2772 } 2773 2774 if ((child.mViewFlags & DUPLICATE_PARENT_STATE) == DUPLICATE_PARENT_STATE) { 2775 mGroupFlags |= FLAG_NOTIFY_CHILDREN_ON_DRAWABLE_STATE_CHANGE; 2776 } 2777 } 2778 2779 private void addInArray(View child, int index) { 2780 View[] children = mChildren; 2781 final int count = mChildrenCount; 2782 final int size = children.length; 2783 if (index == count) { 2784 if (size == count) { 2785 mChildren = new View[size + ARRAY_CAPACITY_INCREMENT]; 2786 System.arraycopy(children, 0, mChildren, 0, size); 2787 children = mChildren; 2788 } 2789 children[mChildrenCount++] = child; 2790 } else if (index < count) { 2791 if (size == count) { 2792 mChildren = new View[size + ARRAY_CAPACITY_INCREMENT]; 2793 System.arraycopy(children, 0, mChildren, 0, index); 2794 System.arraycopy(children, index, mChildren, index + 1, count - index); 2795 children = mChildren; 2796 } else { 2797 System.arraycopy(children, index, children, index + 1, count - index); 2798 } 2799 children[index] = child; 2800 mChildrenCount++; 2801 } else { 2802 throw new IndexOutOfBoundsException("index=" + index + " count=" + count); 2803 } 2804 } 2805 2806 // This method also sets the child's mParent to null 2807 private void removeFromArray(int index) { 2808 final View[] children = mChildren; 2809 if (!(mTransitioningViews != null && mTransitioningViews.contains(children[index]))) { 2810 children[index].mParent = null; 2811 } 2812 final int count = mChildrenCount; 2813 if (index == count - 1) { 2814 children[--mChildrenCount] = null; 2815 } else if (index >= 0 && index < count) { 2816 System.arraycopy(children, index + 1, children, index, count - index - 1); 2817 children[--mChildrenCount] = null; 2818 } else { 2819 throw new IndexOutOfBoundsException(); 2820 } 2821 } 2822 2823 // This method also sets the children's mParent to null 2824 private void removeFromArray(int start, int count) { 2825 final View[] children = mChildren; 2826 final int childrenCount = mChildrenCount; 2827 2828 start = Math.max(0, start); 2829 final int end = Math.min(childrenCount, start + count); 2830 2831 if (start == end) { 2832 return; 2833 } 2834 2835 if (end == childrenCount) { 2836 for (int i = start; i < end; i++) { 2837 children[i].mParent = null; 2838 children[i] = null; 2839 } 2840 } else { 2841 for (int i = start; i < end; i++) { 2842 children[i].mParent = null; 2843 } 2844 2845 // Since we're looping above, we might as well do the copy, but is arraycopy() 2846 // faster than the extra 2 bounds checks we would do in the loop? 2847 System.arraycopy(children, end, children, start, childrenCount - end); 2848 2849 for (int i = childrenCount - (end - start); i < childrenCount; i++) { 2850 children[i] = null; 2851 } 2852 } 2853 2854 mChildrenCount -= (end - start); 2855 } 2856 2857 private void bindLayoutAnimation(View child) { 2858 Animation a = mLayoutAnimationController.getAnimationForView(child); 2859 child.setAnimation(a); 2860 } 2861 2862 /** 2863 * Subclasses should override this method to set layout animation 2864 * parameters on the supplied child. 2865 * 2866 * @param child the child to associate with animation parameters 2867 * @param params the child's layout parameters which hold the animation 2868 * parameters 2869 * @param index the index of the child in the view group 2870 * @param count the number of children in the view group 2871 */ 2872 protected void attachLayoutAnimationParameters(View child, 2873 LayoutParams params, int index, int count) { 2874 LayoutAnimationController.AnimationParameters animationParams = 2875 params.layoutAnimationParameters; 2876 if (animationParams == null) { 2877 animationParams = new LayoutAnimationController.AnimationParameters(); 2878 params.layoutAnimationParameters = animationParams; 2879 } 2880 2881 animationParams.count = count; 2882 animationParams.index = index; 2883 } 2884 2885 /** 2886 * {@inheritDoc} 2887 */ 2888 public void removeView(View view) { 2889 removeViewInternal(view); 2890 requestLayout(); 2891 invalidate(); 2892 } 2893 2894 /** 2895 * Removes a view during layout. This is useful if in your onLayout() method, 2896 * you need to remove more views. 2897 * 2898 * @param view the view to remove from the group 2899 */ 2900 public void removeViewInLayout(View view) { 2901 removeViewInternal(view); 2902 } 2903 2904 /** 2905 * Removes a range of views during layout. This is useful if in your onLayout() method, 2906 * you need to remove more views. 2907 * 2908 * @param start the index of the first view to remove from the group 2909 * @param count the number of views to remove from the group 2910 */ 2911 public void removeViewsInLayout(int start, int count) { 2912 removeViewsInternal(start, count); 2913 } 2914 2915 /** 2916 * Removes the view at the specified position in the group. 2917 * 2918 * @param index the position in the group of the view to remove 2919 */ 2920 public void removeViewAt(int index) { 2921 removeViewInternal(index, getChildAt(index)); 2922 requestLayout(); 2923 invalidate(); 2924 } 2925 2926 /** 2927 * Removes the specified range of views from the group. 2928 * 2929 * @param start the first position in the group of the range of views to remove 2930 * @param count the number of views to remove 2931 */ 2932 public void removeViews(int start, int count) { 2933 removeViewsInternal(start, count); 2934 requestLayout(); 2935 invalidate(); 2936 } 2937 2938 private void removeViewInternal(View view) { 2939 final int index = indexOfChild(view); 2940 if (index >= 0) { 2941 removeViewInternal(index, view); 2942 } 2943 } 2944 2945 private void removeViewInternal(int index, View view) { 2946 2947 if (mTransition != null) { 2948 mTransition.removeChild(this, view); 2949 } 2950 2951 boolean clearChildFocus = false; 2952 if (view == mFocused) { 2953 view.clearFocusForRemoval(); 2954 clearChildFocus = true; 2955 } 2956 2957 if (view.getAnimation() != null || 2958 (mTransitioningViews != null && mTransitioningViews.contains(view))) { 2959 addDisappearingView(view); 2960 } else if (view.mAttachInfo != null) { 2961 view.dispatchDetachedFromWindow(); 2962 } 2963 2964 if (mOnHierarchyChangeListener != null) { 2965 mOnHierarchyChangeListener.onChildViewRemoved(this, view); 2966 } 2967 2968 needGlobalAttributesUpdate(false); 2969 2970 removeFromArray(index); 2971 2972 if (clearChildFocus) { 2973 clearChildFocus(view); 2974 } 2975 } 2976 2977 /** 2978 * Sets the LayoutTransition object for this ViewGroup. If the LayoutTransition object is 2979 * not null, changes in layout which occur because of children being added to or removed from 2980 * the ViewGroup will be animated according to the animations defined in that LayoutTransition 2981 * object. By default, the transition object is null (so layout changes are not animated). 2982 * 2983 * @param transition The LayoutTransition object that will animated changes in layout. A value 2984 * of <code>null</code> means no transition will run on layout changes. 2985 * @attr ref android.R.styleable#ViewGroup_animateLayoutChanges 2986 */ 2987 public void setLayoutTransition(LayoutTransition transition) { 2988 if (mTransition != null) { 2989 mTransition.removeTransitionListener(mLayoutTransitionListener); 2990 } 2991 mTransition = transition; 2992 if (mTransition != null) { 2993 mTransition.addTransitionListener(mLayoutTransitionListener); 2994 } 2995 } 2996 2997 /** 2998 * Gets the LayoutTransition object for this ViewGroup. If the LayoutTransition object is 2999 * not null, changes in layout which occur because of children being added to or removed from 3000 * the ViewGroup will be animated according to the animations defined in that LayoutTransition 3001 * object. By default, the transition object is null (so layout changes are not animated). 3002 * 3003 * @return LayoutTranstion The LayoutTransition object that will animated changes in layout. 3004 * A value of <code>null</code> means no transition will run on layout changes. 3005 */ 3006 public LayoutTransition getLayoutTransition() { 3007 return mTransition; 3008 } 3009 3010 private void removeViewsInternal(int start, int count) { 3011 final OnHierarchyChangeListener onHierarchyChangeListener = mOnHierarchyChangeListener; 3012 final boolean notifyListener = onHierarchyChangeListener != null; 3013 final View focused = mFocused; 3014 final boolean detach = mAttachInfo != null; 3015 View clearChildFocus = null; 3016 3017 final View[] children = mChildren; 3018 final int end = start + count; 3019 3020 for (int i = start; i < end; i++) { 3021 final View view = children[i]; 3022 3023 if (mTransition != null) { 3024 mTransition.removeChild(this, view); 3025 } 3026 3027 if (view == focused) { 3028 view.clearFocusForRemoval(); 3029 clearChildFocus = view; 3030 } 3031 3032 if (view.getAnimation() != null || 3033 (mTransitioningViews != null && mTransitioningViews.contains(view))) { 3034 addDisappearingView(view); 3035 } else if (detach) { 3036 view.dispatchDetachedFromWindow(); 3037 } 3038 3039 needGlobalAttributesUpdate(false); 3040 3041 if (notifyListener) { 3042 onHierarchyChangeListener.onChildViewRemoved(this, view); 3043 } 3044 } 3045 3046 removeFromArray(start, count); 3047 3048 if (clearChildFocus != null) { 3049 clearChildFocus(clearChildFocus); 3050 } 3051 } 3052 3053 /** 3054 * Call this method to remove all child views from the 3055 * ViewGroup. 3056 */ 3057 public void removeAllViews() { 3058 removeAllViewsInLayout(); 3059 requestLayout(); 3060 invalidate(); 3061 } 3062 3063 /** 3064 * Called by a ViewGroup subclass to remove child views from itself, 3065 * when it must first know its size on screen before it can calculate how many 3066 * child views it will render. An example is a Gallery or a ListView, which 3067 * may "have" 50 children, but actually only render the number of children 3068 * that can currently fit inside the object on screen. Do not call 3069 * this method unless you are extending ViewGroup and understand the 3070 * view measuring and layout pipeline. 3071 */ 3072 public void removeAllViewsInLayout() { 3073 final int count = mChildrenCount; 3074 if (count <= 0) { 3075 return; 3076 } 3077 3078 final View[] children = mChildren; 3079 mChildrenCount = 0; 3080 3081 final OnHierarchyChangeListener listener = mOnHierarchyChangeListener; 3082 final boolean notify = listener != null; 3083 final View focused = mFocused; 3084 final boolean detach = mAttachInfo != null; 3085 View clearChildFocus = null; 3086 3087 needGlobalAttributesUpdate(false); 3088 3089 for (int i = count - 1; i >= 0; i--) { 3090 final View view = children[i]; 3091 3092 if (mTransition != null) { 3093 mTransition.removeChild(this, view); 3094 } 3095 3096 if (view == focused) { 3097 view.clearFocusForRemoval(); 3098 clearChildFocus = view; 3099 } 3100 3101 if (view.getAnimation() != null || 3102 (mTransitioningViews != null && mTransitioningViews.contains(view))) { 3103 addDisappearingView(view); 3104 } else if (detach) { 3105 view.dispatchDetachedFromWindow(); 3106 } 3107 3108 if (notify) { 3109 listener.onChildViewRemoved(this, view); 3110 } 3111 3112 view.mParent = null; 3113 children[i] = null; 3114 } 3115 3116 if (clearChildFocus != null) { 3117 clearChildFocus(clearChildFocus); 3118 } 3119 } 3120 3121 /** 3122 * Finishes the removal of a detached view. This method will dispatch the detached from 3123 * window event and notify the hierarchy change listener. 3124 * 3125 * @param child the child to be definitely removed from the view hierarchy 3126 * @param animate if true and the view has an animation, the view is placed in the 3127 * disappearing views list, otherwise, it is detached from the window 3128 * 3129 * @see #attachViewToParent(View, int, android.view.ViewGroup.LayoutParams) 3130 * @see #detachAllViewsFromParent() 3131 * @see #detachViewFromParent(View) 3132 * @see #detachViewFromParent(int) 3133 */ 3134 protected void removeDetachedView(View child, boolean animate) { 3135 if (mTransition != null) { 3136 mTransition.removeChild(this, child); 3137 } 3138 3139 if (child == mFocused) { 3140 child.clearFocus(); 3141 } 3142 3143 if ((animate && child.getAnimation() != null) || 3144 (mTransitioningViews != null && mTransitioningViews.contains(child))) { 3145 addDisappearingView(child); 3146 } else if (child.mAttachInfo != null) { 3147 child.dispatchDetachedFromWindow(); 3148 } 3149 3150 if (mOnHierarchyChangeListener != null) { 3151 mOnHierarchyChangeListener.onChildViewRemoved(this, child); 3152 } 3153 } 3154 3155 /** 3156 * Attaches a view to this view group. Attaching a view assigns this group as the parent, 3157 * sets the layout parameters and puts the view in the list of children so it can be retrieved 3158 * by calling {@link #getChildAt(int)}. 3159 * 3160 * This method should be called only for view which were detached from their parent. 3161 * 3162 * @param child the child to attach 3163 * @param index the index at which the child should be attached 3164 * @param params the layout parameters of the child 3165 * 3166 * @see #removeDetachedView(View, boolean) 3167 * @see #detachAllViewsFromParent() 3168 * @see #detachViewFromParent(View) 3169 * @see #detachViewFromParent(int) 3170 */ 3171 protected void attachViewToParent(View child, int index, LayoutParams params) { 3172 child.mLayoutParams = params; 3173 3174 if (index < 0) { 3175 index = mChildrenCount; 3176 } 3177 3178 addInArray(child, index); 3179 3180 child.mParent = this; 3181 child.mPrivateFlags = (child.mPrivateFlags & ~DIRTY_MASK & ~DRAWING_CACHE_VALID) | DRAWN; 3182 3183 if (child.hasFocus()) { 3184 requestChildFocus(child, child.findFocus()); 3185 } 3186 } 3187 3188 /** 3189 * Detaches a view from its parent. Detaching a view should be temporary and followed 3190 * either by a call to {@link #attachViewToParent(View, int, android.view.ViewGroup.LayoutParams)} 3191 * or a call to {@link #removeDetachedView(View, boolean)}. When a view is detached, 3192 * its parent is null and cannot be retrieved by a call to {@link #getChildAt(int)}. 3193 * 3194 * @param child the child to detach 3195 * 3196 * @see #detachViewFromParent(int) 3197 * @see #detachViewsFromParent(int, int) 3198 * @see #detachAllViewsFromParent() 3199 * @see #attachViewToParent(View, int, android.view.ViewGroup.LayoutParams) 3200 * @see #removeDetachedView(View, boolean) 3201 */ 3202 protected void detachViewFromParent(View child) { 3203 removeFromArray(indexOfChild(child)); 3204 } 3205 3206 /** 3207 * Detaches a view from its parent. Detaching a view should be temporary and followed 3208 * either by a call to {@link #attachViewToParent(View, int, android.view.ViewGroup.LayoutParams)} 3209 * or a call to {@link #removeDetachedView(View, boolean)}. When a view is detached, 3210 * its parent is null and cannot be retrieved by a call to {@link #getChildAt(int)}. 3211 * 3212 * @param index the index of the child to detach 3213 * 3214 * @see #detachViewFromParent(View) 3215 * @see #detachAllViewsFromParent() 3216 * @see #detachViewsFromParent(int, int) 3217 * @see #attachViewToParent(View, int, android.view.ViewGroup.LayoutParams) 3218 * @see #removeDetachedView(View, boolean) 3219 */ 3220 protected void detachViewFromParent(int index) { 3221 removeFromArray(index); 3222 } 3223 3224 /** 3225 * Detaches a range of view from their parent. Detaching a view should be temporary and followed 3226 * either by a call to {@link #attachViewToParent(View, int, android.view.ViewGroup.LayoutParams)} 3227 * or a call to {@link #removeDetachedView(View, boolean)}. When a view is detached, its 3228 * parent is null and cannot be retrieved by a call to {@link #getChildAt(int)}. 3229 * 3230 * @param start the first index of the childrend range to detach 3231 * @param count the number of children to detach 3232 * 3233 * @see #detachViewFromParent(View) 3234 * @see #detachViewFromParent(int) 3235 * @see #detachAllViewsFromParent() 3236 * @see #attachViewToParent(View, int, android.view.ViewGroup.LayoutParams) 3237 * @see #removeDetachedView(View, boolean) 3238 */ 3239 protected void detachViewsFromParent(int start, int count) { 3240 removeFromArray(start, count); 3241 } 3242 3243 /** 3244 * Detaches all views from the parent. Detaching a view should be temporary and followed 3245 * either by a call to {@link #attachViewToParent(View, int, android.view.ViewGroup.LayoutParams)} 3246 * or a call to {@link #removeDetachedView(View, boolean)}. When a view is detached, 3247 * its parent is null and cannot be retrieved by a call to {@link #getChildAt(int)}. 3248 * 3249 * @see #detachViewFromParent(View) 3250 * @see #detachViewFromParent(int) 3251 * @see #detachViewsFromParent(int, int) 3252 * @see #attachViewToParent(View, int, android.view.ViewGroup.LayoutParams) 3253 * @see #removeDetachedView(View, boolean) 3254 */ 3255 protected void detachAllViewsFromParent() { 3256 final int count = mChildrenCount; 3257 if (count <= 0) { 3258 return; 3259 } 3260 3261 final View[] children = mChildren; 3262 mChildrenCount = 0; 3263 3264 for (int i = count - 1; i >= 0; i--) { 3265 children[i].mParent = null; 3266 children[i] = null; 3267 } 3268 } 3269 3270 /** 3271 * Don't call or override this method. It is used for the implementation of 3272 * the view hierarchy. 3273 */ 3274 public final void invalidateChild(View child, final Rect dirty) { 3275 if (ViewDebug.TRACE_HIERARCHY) { 3276 ViewDebug.trace(this, ViewDebug.HierarchyTraceType.INVALIDATE_CHILD); 3277 } 3278 3279 ViewParent parent = this; 3280 3281 final AttachInfo attachInfo = mAttachInfo; 3282 if (attachInfo != null) { 3283 // If the child is drawing an animation, we want to copy this flag onto 3284 // ourselves and the parent to make sure the invalidate request goes 3285 // through 3286 final boolean drawAnimation = (child.mPrivateFlags & DRAW_ANIMATION) == DRAW_ANIMATION; 3287 3288 if (dirty == null) { 3289 do { 3290 View view = null; 3291 if (parent instanceof View) { 3292 view = (View) parent; 3293 if ((view.mPrivateFlags & DIRTY_MASK) != 0) { 3294 // already marked dirty - we're done 3295 break; 3296 } 3297 } 3298 3299 if (drawAnimation) { 3300 if (view != null) { 3301 view.mPrivateFlags |= DRAW_ANIMATION; 3302 } else if (parent instanceof ViewRoot) { 3303 ((ViewRoot) parent).mIsAnimating = true; 3304 } 3305 } 3306 3307 if (parent instanceof ViewRoot) { 3308 ((ViewRoot) parent).invalidate(); 3309 parent = null; 3310 } else if (view != null) { 3311 if ((mPrivateFlags & DRAWN) == DRAWN) { 3312 view.mPrivateFlags &= ~DRAWING_CACHE_VALID; 3313 view.mPrivateFlags |= DIRTY; 3314 parent = view.mParent; 3315 } else { 3316 parent = null; 3317 } 3318 } 3319 } while (parent != null); 3320 } else { 3321 // Check whether the child that requests the invalidate is fully opaque 3322 final boolean isOpaque = child.isOpaque() && !drawAnimation && 3323 child.getAnimation() == null; 3324 // Mark the child as dirty, using the appropriate flag 3325 // Make sure we do not set both flags at the same time 3326 final int opaqueFlag = isOpaque ? DIRTY_OPAQUE : DIRTY; 3327 3328 final int[] location = attachInfo.mInvalidateChildLocation; 3329 location[CHILD_LEFT_INDEX] = child.mLeft; 3330 location[CHILD_TOP_INDEX] = child.mTop; 3331 Matrix childMatrix = child.getMatrix(); 3332 if (!childMatrix.isIdentity()) { 3333 RectF boundingRect = attachInfo.mTmpTransformRect; 3334 boundingRect.set(dirty); 3335 childMatrix.mapRect(boundingRect); 3336 dirty.set((int) boundingRect.left, (int) boundingRect.top, 3337 (int) (boundingRect.right + 0.5f), 3338 (int) (boundingRect.bottom + 0.5f)); 3339 } 3340 3341 do { 3342 View view = null; 3343 if (parent instanceof View) { 3344 view = (View) parent; 3345 } 3346 3347 if (drawAnimation) { 3348 if (view != null) { 3349 view.mPrivateFlags |= DRAW_ANIMATION; 3350 } else if (parent instanceof ViewRoot) { 3351 ((ViewRoot) parent).mIsAnimating = true; 3352 } 3353 } 3354 3355 // If the parent is dirty opaque or not dirty, mark it dirty with the opaque 3356 // flag coming from the child that initiated the invalidate 3357 if (view != null && (view.mPrivateFlags & DIRTY_MASK) != DIRTY) { 3358 view.mPrivateFlags = (view.mPrivateFlags & ~DIRTY_MASK) | opaqueFlag; 3359 } 3360 3361 parent = parent.invalidateChildInParent(location, dirty); 3362 if (view != null) { 3363 // Account for transform on current parent 3364 Matrix m = view.getMatrix(); 3365 if (!m.isIdentity()) { 3366 RectF boundingRect = attachInfo.mTmpTransformRect; 3367 boundingRect.set(dirty); 3368 m.mapRect(boundingRect); 3369 dirty.set((int) boundingRect.left, (int) boundingRect.top, 3370 (int) (boundingRect.right + 0.5f), 3371 (int) (boundingRect.bottom + 0.5f)); 3372 } 3373 } 3374 } while (parent != null); 3375 } 3376 } 3377 } 3378 3379 /** 3380 * Don't call or override this method. It is used for the implementation of 3381 * the view hierarchy. 3382 * 3383 * This implementation returns null if this ViewGroup does not have a parent, 3384 * if this ViewGroup is already fully invalidated or if the dirty rectangle 3385 * does not intersect with this ViewGroup's bounds. 3386 */ 3387 public ViewParent invalidateChildInParent(final int[] location, final Rect dirty) { 3388 if (ViewDebug.TRACE_HIERARCHY) { 3389 ViewDebug.trace(this, ViewDebug.HierarchyTraceType.INVALIDATE_CHILD_IN_PARENT); 3390 } 3391 3392 if ((mPrivateFlags & DRAWN) == DRAWN) { 3393 if ((mGroupFlags & (FLAG_OPTIMIZE_INVALIDATE | FLAG_ANIMATION_DONE)) != 3394 FLAG_OPTIMIZE_INVALIDATE) { 3395 dirty.offset(location[CHILD_LEFT_INDEX] - mScrollX, 3396 location[CHILD_TOP_INDEX] - mScrollY); 3397 3398 final int left = mLeft; 3399 final int top = mTop; 3400 3401 if (dirty.intersect(0, 0, mRight - left, mBottom - top) || 3402 (mPrivateFlags & DRAW_ANIMATION) == DRAW_ANIMATION) { 3403 mPrivateFlags &= ~DRAWING_CACHE_VALID; 3404 3405 location[CHILD_LEFT_INDEX] = left; 3406 location[CHILD_TOP_INDEX] = top; 3407 3408 return mParent; 3409 } 3410 } else { 3411 mPrivateFlags &= ~DRAWN & ~DRAWING_CACHE_VALID; 3412 3413 location[CHILD_LEFT_INDEX] = mLeft; 3414 location[CHILD_TOP_INDEX] = mTop; 3415 3416 dirty.set(0, 0, mRight - location[CHILD_LEFT_INDEX], 3417 mBottom - location[CHILD_TOP_INDEX]); 3418 3419 return mParent; 3420 } 3421 } 3422 3423 return null; 3424 } 3425 3426 /** 3427 * Offset a rectangle that is in a descendant's coordinate 3428 * space into our coordinate space. 3429 * @param descendant A descendant of this view 3430 * @param rect A rectangle defined in descendant's coordinate space. 3431 */ 3432 public final void offsetDescendantRectToMyCoords(View descendant, Rect rect) { 3433 offsetRectBetweenParentAndChild(descendant, rect, true, false); 3434 } 3435 3436 /** 3437 * Offset a rectangle that is in our coordinate space into an ancestor's 3438 * coordinate space. 3439 * @param descendant A descendant of this view 3440 * @param rect A rectangle defined in descendant's coordinate space. 3441 */ 3442 public final void offsetRectIntoDescendantCoords(View descendant, Rect rect) { 3443 offsetRectBetweenParentAndChild(descendant, rect, false, false); 3444 } 3445 3446 /** 3447 * Helper method that offsets a rect either from parent to descendant or 3448 * descendant to parent. 3449 */ 3450 void offsetRectBetweenParentAndChild(View descendant, Rect rect, 3451 boolean offsetFromChildToParent, boolean clipToBounds) { 3452 3453 // already in the same coord system :) 3454 if (descendant == this) { 3455 return; 3456 } 3457 3458 ViewParent theParent = descendant.mParent; 3459 3460 // search and offset up to the parent 3461 while ((theParent != null) 3462 && (theParent instanceof View) 3463 && (theParent != this)) { 3464 3465 if (offsetFromChildToParent) { 3466 rect.offset(descendant.mLeft - descendant.mScrollX, 3467 descendant.mTop - descendant.mScrollY); 3468 if (clipToBounds) { 3469 View p = (View) theParent; 3470 rect.intersect(0, 0, p.mRight - p.mLeft, p.mBottom - p.mTop); 3471 } 3472 } else { 3473 if (clipToBounds) { 3474 View p = (View) theParent; 3475 rect.intersect(0, 0, p.mRight - p.mLeft, p.mBottom - p.mTop); 3476 } 3477 rect.offset(descendant.mScrollX - descendant.mLeft, 3478 descendant.mScrollY - descendant.mTop); 3479 } 3480 3481 descendant = (View) theParent; 3482 theParent = descendant.mParent; 3483 } 3484 3485 // now that we are up to this view, need to offset one more time 3486 // to get into our coordinate space 3487 if (theParent == this) { 3488 if (offsetFromChildToParent) { 3489 rect.offset(descendant.mLeft - descendant.mScrollX, 3490 descendant.mTop - descendant.mScrollY); 3491 } else { 3492 rect.offset(descendant.mScrollX - descendant.mLeft, 3493 descendant.mScrollY - descendant.mTop); 3494 } 3495 } else { 3496 throw new IllegalArgumentException("parameter must be a descendant of this view"); 3497 } 3498 } 3499 3500 /** 3501 * Offset the vertical location of all children of this view by the specified number of pixels. 3502 * 3503 * @param offset the number of pixels to offset 3504 * 3505 * @hide 3506 */ 3507 public void offsetChildrenTopAndBottom(int offset) { 3508 final int count = mChildrenCount; 3509 final View[] children = mChildren; 3510 3511 for (int i = 0; i < count; i++) { 3512 final View v = children[i]; 3513 v.mTop += offset; 3514 v.mBottom += offset; 3515 } 3516 } 3517 3518 /** 3519 * {@inheritDoc} 3520 */ 3521 public boolean getChildVisibleRect(View child, Rect r, android.graphics.Point offset) { 3522 int dx = child.mLeft - mScrollX; 3523 int dy = child.mTop - mScrollY; 3524 if (offset != null) { 3525 offset.x += dx; 3526 offset.y += dy; 3527 } 3528 r.offset(dx, dy); 3529 return r.intersect(0, 0, mRight - mLeft, mBottom - mTop) && 3530 (mParent == null || mParent.getChildVisibleRect(this, r, offset)); 3531 } 3532 3533 /** 3534 * {@inheritDoc} 3535 */ 3536 @Override 3537 protected abstract void onLayout(boolean changed, 3538 int l, int t, int r, int b); 3539 3540 /** 3541 * Indicates whether the view group has the ability to animate its children 3542 * after the first layout. 3543 * 3544 * @return true if the children can be animated, false otherwise 3545 */ 3546 protected boolean canAnimate() { 3547 return mLayoutAnimationController != null; 3548 } 3549 3550 /** 3551 * Runs the layout animation. Calling this method triggers a relayout of 3552 * this view group. 3553 */ 3554 public void startLayoutAnimation() { 3555 if (mLayoutAnimationController != null) { 3556 mGroupFlags |= FLAG_RUN_ANIMATION; 3557 requestLayout(); 3558 } 3559 } 3560 3561 /** 3562 * Schedules the layout animation to be played after the next layout pass 3563 * of this view group. This can be used to restart the layout animation 3564 * when the content of the view group changes or when the activity is 3565 * paused and resumed. 3566 */ 3567 public void scheduleLayoutAnimation() { 3568 mGroupFlags |= FLAG_RUN_ANIMATION; 3569 } 3570 3571 /** 3572 * Sets the layout animation controller used to animate the group's 3573 * children after the first layout. 3574 * 3575 * @param controller the animation controller 3576 */ 3577 public void setLayoutAnimation(LayoutAnimationController controller) { 3578 mLayoutAnimationController = controller; 3579 if (mLayoutAnimationController != null) { 3580 mGroupFlags |= FLAG_RUN_ANIMATION; 3581 } 3582 } 3583 3584 /** 3585 * Returns the layout animation controller used to animate the group's 3586 * children. 3587 * 3588 * @return the current animation controller 3589 */ 3590 public LayoutAnimationController getLayoutAnimation() { 3591 return mLayoutAnimationController; 3592 } 3593 3594 /** 3595 * Indicates whether the children's drawing cache is used during a layout 3596 * animation. By default, the drawing cache is enabled but this will prevent 3597 * nested layout animations from working. To nest animations, you must disable 3598 * the cache. 3599 * 3600 * @return true if the animation cache is enabled, false otherwise 3601 * 3602 * @see #setAnimationCacheEnabled(boolean) 3603 * @see View#setDrawingCacheEnabled(boolean) 3604 */ 3605 @ViewDebug.ExportedProperty 3606 public boolean isAnimationCacheEnabled() { 3607 return (mGroupFlags & FLAG_ANIMATION_CACHE) == FLAG_ANIMATION_CACHE; 3608 } 3609 3610 /** 3611 * Enables or disables the children's drawing cache during a layout animation. 3612 * By default, the drawing cache is enabled but this will prevent nested 3613 * layout animations from working. To nest animations, you must disable the 3614 * cache. 3615 * 3616 * @param enabled true to enable the animation cache, false otherwise 3617 * 3618 * @see #isAnimationCacheEnabled() 3619 * @see View#setDrawingCacheEnabled(boolean) 3620 */ 3621 public void setAnimationCacheEnabled(boolean enabled) { 3622 setBooleanFlag(FLAG_ANIMATION_CACHE, enabled); 3623 } 3624 3625 /** 3626 * Indicates whether this ViewGroup will always try to draw its children using their 3627 * drawing cache. By default this property is enabled. 3628 * 3629 * @return true if the animation cache is enabled, false otherwise 3630 * 3631 * @see #setAlwaysDrawnWithCacheEnabled(boolean) 3632 * @see #setChildrenDrawnWithCacheEnabled(boolean) 3633 * @see View#setDrawingCacheEnabled(boolean) 3634 */ 3635 @ViewDebug.ExportedProperty(category = "drawing") 3636 public boolean isAlwaysDrawnWithCacheEnabled() { 3637 return (mGroupFlags & FLAG_ALWAYS_DRAWN_WITH_CACHE) == FLAG_ALWAYS_DRAWN_WITH_CACHE; 3638 } 3639 3640 /** 3641 * Indicates whether this ViewGroup will always try to draw its children using their 3642 * drawing cache. This property can be set to true when the cache rendering is 3643 * slightly different from the children's normal rendering. Renderings can be different, 3644 * for instance, when the cache's quality is set to low. 3645 * 3646 * When this property is disabled, the ViewGroup will use the drawing cache of its 3647 * children only when asked to. It's usually the task of subclasses to tell ViewGroup 3648 * when to start using the drawing cache and when to stop using it. 3649 * 3650 * @param always true to always draw with the drawing cache, false otherwise 3651 * 3652 * @see #isAlwaysDrawnWithCacheEnabled() 3653 * @see #setChildrenDrawnWithCacheEnabled(boolean) 3654 * @see View#setDrawingCacheEnabled(boolean) 3655 * @see View#setDrawingCacheQuality(int) 3656 */ 3657 public void setAlwaysDrawnWithCacheEnabled(boolean always) { 3658 setBooleanFlag(FLAG_ALWAYS_DRAWN_WITH_CACHE, always); 3659 } 3660 3661 /** 3662 * Indicates whether the ViewGroup is currently drawing its children using 3663 * their drawing cache. 3664 * 3665 * @return true if children should be drawn with their cache, false otherwise 3666 * 3667 * @see #setAlwaysDrawnWithCacheEnabled(boolean) 3668 * @see #setChildrenDrawnWithCacheEnabled(boolean) 3669 */ 3670 @ViewDebug.ExportedProperty(category = "drawing") 3671 protected boolean isChildrenDrawnWithCacheEnabled() { 3672 return (mGroupFlags & FLAG_CHILDREN_DRAWN_WITH_CACHE) == FLAG_CHILDREN_DRAWN_WITH_CACHE; 3673 } 3674 3675 /** 3676 * Tells the ViewGroup to draw its children using their drawing cache. This property 3677 * is ignored when {@link #isAlwaysDrawnWithCacheEnabled()} is true. A child's drawing cache 3678 * will be used only if it has been enabled. 3679 * 3680 * Subclasses should call this method to start and stop using the drawing cache when 3681 * they perform performance sensitive operations, like scrolling or animating. 3682 * 3683 * @param enabled true if children should be drawn with their cache, false otherwise 3684 * 3685 * @see #setAlwaysDrawnWithCacheEnabled(boolean) 3686 * @see #isChildrenDrawnWithCacheEnabled() 3687 */ 3688 protected void setChildrenDrawnWithCacheEnabled(boolean enabled) { 3689 setBooleanFlag(FLAG_CHILDREN_DRAWN_WITH_CACHE, enabled); 3690 } 3691 3692 /** 3693 * Indicates whether the ViewGroup is drawing its children in the order defined by 3694 * {@link #getChildDrawingOrder(int, int)}. 3695 * 3696 * @return true if children drawing order is defined by {@link #getChildDrawingOrder(int, int)}, 3697 * false otherwise 3698 * 3699 * @see #setChildrenDrawingOrderEnabled(boolean) 3700 * @see #getChildDrawingOrder(int, int) 3701 */ 3702 @ViewDebug.ExportedProperty(category = "drawing") 3703 protected boolean isChildrenDrawingOrderEnabled() { 3704 return (mGroupFlags & FLAG_USE_CHILD_DRAWING_ORDER) == FLAG_USE_CHILD_DRAWING_ORDER; 3705 } 3706 3707 /** 3708 * Tells the ViewGroup whether to draw its children in the order defined by the method 3709 * {@link #getChildDrawingOrder(int, int)}. 3710 * 3711 * @param enabled true if the order of the children when drawing is determined by 3712 * {@link #getChildDrawingOrder(int, int)}, false otherwise 3713 * 3714 * @see #isChildrenDrawingOrderEnabled() 3715 * @see #getChildDrawingOrder(int, int) 3716 */ 3717 protected void setChildrenDrawingOrderEnabled(boolean enabled) { 3718 setBooleanFlag(FLAG_USE_CHILD_DRAWING_ORDER, enabled); 3719 } 3720 3721 private void setBooleanFlag(int flag, boolean value) { 3722 if (value) { 3723 mGroupFlags |= flag; 3724 } else { 3725 mGroupFlags &= ~flag; 3726 } 3727 } 3728 3729 /** 3730 * Returns an integer indicating what types of drawing caches are kept in memory. 3731 * 3732 * @see #setPersistentDrawingCache(int) 3733 * @see #setAnimationCacheEnabled(boolean) 3734 * 3735 * @return one or a combination of {@link #PERSISTENT_NO_CACHE}, 3736 * {@link #PERSISTENT_ANIMATION_CACHE}, {@link #PERSISTENT_SCROLLING_CACHE} 3737 * and {@link #PERSISTENT_ALL_CACHES} 3738 */ 3739 @ViewDebug.ExportedProperty(category = "drawing", mapping = { 3740 @ViewDebug.IntToString(from = PERSISTENT_NO_CACHE, to = "NONE"), 3741 @ViewDebug.IntToString(from = PERSISTENT_ANIMATION_CACHE, to = "ANIMATION"), 3742 @ViewDebug.IntToString(from = PERSISTENT_SCROLLING_CACHE, to = "SCROLLING"), 3743 @ViewDebug.IntToString(from = PERSISTENT_ALL_CACHES, to = "ALL") 3744 }) 3745 public int getPersistentDrawingCache() { 3746 return mPersistentDrawingCache; 3747 } 3748 3749 /** 3750 * Indicates what types of drawing caches should be kept in memory after 3751 * they have been created. 3752 * 3753 * @see #getPersistentDrawingCache() 3754 * @see #setAnimationCacheEnabled(boolean) 3755 * 3756 * @param drawingCacheToKeep one or a combination of {@link #PERSISTENT_NO_CACHE}, 3757 * {@link #PERSISTENT_ANIMATION_CACHE}, {@link #PERSISTENT_SCROLLING_CACHE} 3758 * and {@link #PERSISTENT_ALL_CACHES} 3759 */ 3760 public void setPersistentDrawingCache(int drawingCacheToKeep) { 3761 mPersistentDrawingCache = drawingCacheToKeep & PERSISTENT_ALL_CACHES; 3762 } 3763 3764 /** 3765 * Returns a new set of layout parameters based on the supplied attributes set. 3766 * 3767 * @param attrs the attributes to build the layout parameters from 3768 * 3769 * @return an instance of {@link android.view.ViewGroup.LayoutParams} or one 3770 * of its descendants 3771 */ 3772 public LayoutParams generateLayoutParams(AttributeSet attrs) { 3773 return new LayoutParams(getContext(), attrs); 3774 } 3775 3776 /** 3777 * Returns a safe set of layout parameters based on the supplied layout params. 3778 * When a ViewGroup is passed a View whose layout params do not pass the test of 3779 * {@link #checkLayoutParams(android.view.ViewGroup.LayoutParams)}, this method 3780 * is invoked. This method should return a new set of layout params suitable for 3781 * this ViewGroup, possibly by copying the appropriate attributes from the 3782 * specified set of layout params. 3783 * 3784 * @param p The layout parameters to convert into a suitable set of layout parameters 3785 * for this ViewGroup. 3786 * 3787 * @return an instance of {@link android.view.ViewGroup.LayoutParams} or one 3788 * of its descendants 3789 */ 3790 protected LayoutParams generateLayoutParams(ViewGroup.LayoutParams p) { 3791 return p; 3792 } 3793 3794 /** 3795 * Returns a set of default layout parameters. These parameters are requested 3796 * when the View passed to {@link #addView(View)} has no layout parameters 3797 * already set. If null is returned, an exception is thrown from addView. 3798 * 3799 * @return a set of default layout parameters or null 3800 */ 3801 protected LayoutParams generateDefaultLayoutParams() { 3802 return new LayoutParams(LayoutParams.WRAP_CONTENT, LayoutParams.WRAP_CONTENT); 3803 } 3804 3805 /** 3806 * @hide 3807 */ 3808 @Override 3809 protected boolean dispatchConsistencyCheck(int consistency) { 3810 boolean result = super.dispatchConsistencyCheck(consistency); 3811 3812 final int count = mChildrenCount; 3813 final View[] children = mChildren; 3814 for (int i = 0; i < count; i++) { 3815 if (!children[i].dispatchConsistencyCheck(consistency)) result = false; 3816 } 3817 3818 return result; 3819 } 3820 3821 /** 3822 * @hide 3823 */ 3824 @Override 3825 protected boolean onConsistencyCheck(int consistency) { 3826 boolean result = super.onConsistencyCheck(consistency); 3827 3828 final boolean checkLayout = (consistency & ViewDebug.CONSISTENCY_LAYOUT) != 0; 3829 final boolean checkDrawing = (consistency & ViewDebug.CONSISTENCY_DRAWING) != 0; 3830 3831 if (checkLayout) { 3832 final int count = mChildrenCount; 3833 final View[] children = mChildren; 3834 for (int i = 0; i < count; i++) { 3835 if (children[i].getParent() != this) { 3836 result = false; 3837 android.util.Log.d(ViewDebug.CONSISTENCY_LOG_TAG, 3838 "View " + children[i] + " has no parent/a parent that is not " + this); 3839 } 3840 } 3841 } 3842 3843 if (checkDrawing) { 3844 // If this group is dirty, check that the parent is dirty as well 3845 if ((mPrivateFlags & DIRTY_MASK) != 0) { 3846 final ViewParent parent = getParent(); 3847 if (parent != null && !(parent instanceof ViewRoot)) { 3848 if ((((View) parent).mPrivateFlags & DIRTY_MASK) == 0) { 3849 result = false; 3850 android.util.Log.d(ViewDebug.CONSISTENCY_LOG_TAG, 3851 "ViewGroup " + this + " is dirty but its parent is not: " + this); 3852 } 3853 } 3854 } 3855 } 3856 3857 return result; 3858 } 3859 3860 /** 3861 * {@inheritDoc} 3862 */ 3863 @Override 3864 protected void debug(int depth) { 3865 super.debug(depth); 3866 String output; 3867 3868 if (mFocused != null) { 3869 output = debugIndent(depth); 3870 output += "mFocused"; 3871 Log.d(VIEW_LOG_TAG, output); 3872 } 3873 if (mChildrenCount != 0) { 3874 output = debugIndent(depth); 3875 output += "{"; 3876 Log.d(VIEW_LOG_TAG, output); 3877 } 3878 int count = mChildrenCount; 3879 for (int i = 0; i < count; i++) { 3880 View child = mChildren[i]; 3881 child.debug(depth + 1); 3882 } 3883 3884 if (mChildrenCount != 0) { 3885 output = debugIndent(depth); 3886 output += "}"; 3887 Log.d(VIEW_LOG_TAG, output); 3888 } 3889 } 3890 3891 /** 3892 * Returns the position in the group of the specified child view. 3893 * 3894 * @param child the view for which to get the position 3895 * @return a positive integer representing the position of the view in the 3896 * group, or -1 if the view does not exist in the group 3897 */ 3898 public int indexOfChild(View child) { 3899 final int count = mChildrenCount; 3900 final View[] children = mChildren; 3901 for (int i = 0; i < count; i++) { 3902 if (children[i] == child) { 3903 return i; 3904 } 3905 } 3906 return -1; 3907 } 3908 3909 /** 3910 * Returns the number of children in the group. 3911 * 3912 * @return a positive integer representing the number of children in 3913 * the group 3914 */ 3915 public int getChildCount() { 3916 return mChildrenCount; 3917 } 3918 3919 /** 3920 * Returns the view at the specified position in the group. 3921 * 3922 * @param index the position at which to get the view from 3923 * @return the view at the specified position or null if the position 3924 * does not exist within the group 3925 */ 3926 public View getChildAt(int index) { 3927 try { 3928 return mChildren[index]; 3929 } catch (IndexOutOfBoundsException ex) { 3930 return null; 3931 } 3932 } 3933 3934 /** 3935 * Ask all of the children of this view to measure themselves, taking into 3936 * account both the MeasureSpec requirements for this view and its padding. 3937 * We skip children that are in the GONE state The heavy lifting is done in 3938 * getChildMeasureSpec. 3939 * 3940 * @param widthMeasureSpec The width requirements for this view 3941 * @param heightMeasureSpec The height requirements for this view 3942 */ 3943 protected void measureChildren(int widthMeasureSpec, int heightMeasureSpec) { 3944 final int size = mChildrenCount; 3945 final View[] children = mChildren; 3946 for (int i = 0; i < size; ++i) { 3947 final View child = children[i]; 3948 if ((child.mViewFlags & VISIBILITY_MASK) != GONE) { 3949 measureChild(child, widthMeasureSpec, heightMeasureSpec); 3950 } 3951 } 3952 } 3953 3954 /** 3955 * Ask one of the children of this view to measure itself, taking into 3956 * account both the MeasureSpec requirements for this view and its padding. 3957 * The heavy lifting is done in getChildMeasureSpec. 3958 * 3959 * @param child The child to measure 3960 * @param parentWidthMeasureSpec The width requirements for this view 3961 * @param parentHeightMeasureSpec The height requirements for this view 3962 */ 3963 protected void measureChild(View child, int parentWidthMeasureSpec, 3964 int parentHeightMeasureSpec) { 3965 final LayoutParams lp = child.getLayoutParams(); 3966 3967 final int childWidthMeasureSpec = getChildMeasureSpec(parentWidthMeasureSpec, 3968 mPaddingLeft + mPaddingRight, lp.width); 3969 final int childHeightMeasureSpec = getChildMeasureSpec(parentHeightMeasureSpec, 3970 mPaddingTop + mPaddingBottom, lp.height); 3971 3972 child.measure(childWidthMeasureSpec, childHeightMeasureSpec); 3973 } 3974 3975 /** 3976 * Ask one of the children of this view to measure itself, taking into 3977 * account both the MeasureSpec requirements for this view and its padding 3978 * and margins. The child must have MarginLayoutParams The heavy lifting is 3979 * done in getChildMeasureSpec. 3980 * 3981 * @param child The child to measure 3982 * @param parentWidthMeasureSpec The width requirements for this view 3983 * @param widthUsed Extra space that has been used up by the parent 3984 * horizontally (possibly by other children of the parent) 3985 * @param parentHeightMeasureSpec The height requirements for this view 3986 * @param heightUsed Extra space that has been used up by the parent 3987 * vertically (possibly by other children of the parent) 3988 */ 3989 protected void measureChildWithMargins(View child, 3990 int parentWidthMeasureSpec, int widthUsed, 3991 int parentHeightMeasureSpec, int heightUsed) { 3992 final MarginLayoutParams lp = (MarginLayoutParams) child.getLayoutParams(); 3993 3994 final int childWidthMeasureSpec = getChildMeasureSpec(parentWidthMeasureSpec, 3995 mPaddingLeft + mPaddingRight + lp.leftMargin + lp.rightMargin 3996 + widthUsed, lp.width); 3997 final int childHeightMeasureSpec = getChildMeasureSpec(parentHeightMeasureSpec, 3998 mPaddingTop + mPaddingBottom + lp.topMargin + lp.bottomMargin 3999 + heightUsed, lp.height); 4000 4001 child.measure(childWidthMeasureSpec, childHeightMeasureSpec); 4002 } 4003 4004 /** 4005 * Does the hard part of measureChildren: figuring out the MeasureSpec to 4006 * pass to a particular child. This method figures out the right MeasureSpec 4007 * for one dimension (height or width) of one child view. 4008 * 4009 * The goal is to combine information from our MeasureSpec with the 4010 * LayoutParams of the child to get the best possible results. For example, 4011 * if the this view knows its size (because its MeasureSpec has a mode of 4012 * EXACTLY), and the child has indicated in its LayoutParams that it wants 4013 * to be the same size as the parent, the parent should ask the child to 4014 * layout given an exact size. 4015 * 4016 * @param spec The requirements for this view 4017 * @param padding The padding of this view for the current dimension and 4018 * margins, if applicable 4019 * @param childDimension How big the child wants to be in the current 4020 * dimension 4021 * @return a MeasureSpec integer for the child 4022 */ 4023 public static int getChildMeasureSpec(int spec, int padding, int childDimension) { 4024 int specMode = MeasureSpec.getMode(spec); 4025 int specSize = MeasureSpec.getSize(spec); 4026 4027 int size = Math.max(0, specSize - padding); 4028 4029 int resultSize = 0; 4030 int resultMode = 0; 4031 4032 switch (specMode) { 4033 // Parent has imposed an exact size on us 4034 case MeasureSpec.EXACTLY: 4035 if (childDimension >= 0) { 4036 resultSize = childDimension; 4037 resultMode = MeasureSpec.EXACTLY; 4038 } else if (childDimension == LayoutParams.MATCH_PARENT) { 4039 // Child wants to be our size. So be it. 4040 resultSize = size; 4041 resultMode = MeasureSpec.EXACTLY; 4042 } else if (childDimension == LayoutParams.WRAP_CONTENT) { 4043 // Child wants to determine its own size. It can't be 4044 // bigger than us. 4045 resultSize = size; 4046 resultMode = MeasureSpec.AT_MOST; 4047 } 4048 break; 4049 4050 // Parent has imposed a maximum size on us 4051 case MeasureSpec.AT_MOST: 4052 if (childDimension >= 0) { 4053 // Child wants a specific size... so be it 4054 resultSize = childDimension; 4055 resultMode = MeasureSpec.EXACTLY; 4056 } else if (childDimension == LayoutParams.MATCH_PARENT) { 4057 // Child wants to be our size, but our size is not fixed. 4058 // Constrain child to not be bigger than us. 4059 resultSize = size; 4060 resultMode = MeasureSpec.AT_MOST; 4061 } else if (childDimension == LayoutParams.WRAP_CONTENT) { 4062 // Child wants to determine its own size. It can't be 4063 // bigger than us. 4064 resultSize = size; 4065 resultMode = MeasureSpec.AT_MOST; 4066 } 4067 break; 4068 4069 // Parent asked to see how big we want to be 4070 case MeasureSpec.UNSPECIFIED: 4071 if (childDimension >= 0) { 4072 // Child wants a specific size... let him have it 4073 resultSize = childDimension; 4074 resultMode = MeasureSpec.EXACTLY; 4075 } else if (childDimension == LayoutParams.MATCH_PARENT) { 4076 // Child wants to be our size... find out how big it should 4077 // be 4078 resultSize = 0; 4079 resultMode = MeasureSpec.UNSPECIFIED; 4080 } else if (childDimension == LayoutParams.WRAP_CONTENT) { 4081 // Child wants to determine its own size.... find out how 4082 // big it should be 4083 resultSize = 0; 4084 resultMode = MeasureSpec.UNSPECIFIED; 4085 } 4086 break; 4087 } 4088 return MeasureSpec.makeMeasureSpec(resultSize, resultMode); 4089 } 4090 4091 4092 /** 4093 * Removes any pending animations for views that have been removed. Call 4094 * this if you don't want animations for exiting views to stack up. 4095 */ 4096 public void clearDisappearingChildren() { 4097 if (mDisappearingChildren != null) { 4098 mDisappearingChildren.clear(); 4099 } 4100 } 4101 4102 /** 4103 * Add a view which is removed from mChildren but still needs animation 4104 * 4105 * @param v View to add 4106 */ 4107 private void addDisappearingView(View v) { 4108 ArrayList<View> disappearingChildren = mDisappearingChildren; 4109 4110 if (disappearingChildren == null) { 4111 disappearingChildren = mDisappearingChildren = new ArrayList<View>(); 4112 } 4113 4114 disappearingChildren.add(v); 4115 } 4116 4117 /** 4118 * Cleanup a view when its animation is done. This may mean removing it from 4119 * the list of disappearing views. 4120 * 4121 * @param view The view whose animation has finished 4122 * @param animation The animation, cannot be null 4123 */ 4124 private void finishAnimatingView(final View view, Animation animation) { 4125 final ArrayList<View> disappearingChildren = mDisappearingChildren; 4126 if (disappearingChildren != null) { 4127 if (disappearingChildren.contains(view)) { 4128 disappearingChildren.remove(view); 4129 4130 if (view.mAttachInfo != null) { 4131 view.dispatchDetachedFromWindow(); 4132 } 4133 4134 view.clearAnimation(); 4135 mGroupFlags |= FLAG_INVALIDATE_REQUIRED; 4136 } 4137 } 4138 4139 if (animation != null && !animation.getFillAfter()) { 4140 view.clearAnimation(); 4141 } 4142 4143 if ((view.mPrivateFlags & ANIMATION_STARTED) == ANIMATION_STARTED) { 4144 view.onAnimationEnd(); 4145 // Should be performed by onAnimationEnd() but this avoid an infinite loop, 4146 // so we'd rather be safe than sorry 4147 view.mPrivateFlags &= ~ANIMATION_STARTED; 4148 // Draw one more frame after the animation is done 4149 mGroupFlags |= FLAG_INVALIDATE_REQUIRED; 4150 } 4151 } 4152 4153 /** 4154 * This method tells the ViewGroup that the given View object, which should have this 4155 * ViewGroup as its parent, 4156 * should be kept around (re-displayed when the ViewGroup draws its children) even if it 4157 * is removed from its parent. This allows animations, such as those used by 4158 * {@link android.app.Fragment} and {@link android.animation.LayoutTransition} to animate 4159 * the removal of views. A call to this method should always be accompanied by a later call 4160 * to {@link #endViewTransition(View)}, such as after an animation on the View has finished, 4161 * so that the View finally gets removed. 4162 * 4163 * @param view The View object to be kept visible even if it gets removed from its parent. 4164 */ 4165 public void startViewTransition(View view) { 4166 if (view.mParent == this) { 4167 if (mTransitioningViews == null) { 4168 mTransitioningViews = new ArrayList<View>(); 4169 } 4170 mTransitioningViews.add(view); 4171 } 4172 } 4173 4174 /** 4175 * This method should always be called following an earlier call to 4176 * {@link #startViewTransition(View)}. The given View is finally removed from its parent 4177 * and will no longer be displayed. Note that this method does not perform the functionality 4178 * of removing a view from its parent; it just discontinues the display of a View that 4179 * has previously been removed. 4180 * 4181 * @return view The View object that has been removed but is being kept around in the visible 4182 * hierarchy by an earlier call to {@link #startViewTransition(View)}. 4183 */ 4184 public void endViewTransition(View view) { 4185 if (mTransitioningViews != null) { 4186 mTransitioningViews.remove(view); 4187 final ArrayList<View> disappearingChildren = mDisappearingChildren; 4188 if (disappearingChildren != null && disappearingChildren.contains(view)) { 4189 disappearingChildren.remove(view); 4190 if (mVisibilityChangingChildren != null && 4191 mVisibilityChangingChildren.contains(view)) { 4192 mVisibilityChangingChildren.remove(view); 4193 } else { 4194 if (view.mAttachInfo != null) { 4195 view.dispatchDetachedFromWindow(); 4196 } 4197 if (view.mParent != null) { 4198 view.mParent = null; 4199 } 4200 } 4201 mGroupFlags |= FLAG_INVALIDATE_REQUIRED; 4202 } 4203 } 4204 } 4205 4206 private LayoutTransition.TransitionListener mLayoutTransitionListener = 4207 new LayoutTransition.TransitionListener() { 4208 @Override 4209 public void startTransition(LayoutTransition transition, ViewGroup container, 4210 View view, int transitionType) { 4211 // We only care about disappearing items, since we need special logic to keep 4212 // those items visible after they've been 'removed' 4213 if (transitionType == LayoutTransition.DISAPPEARING) { 4214 startViewTransition(view); 4215 } 4216 } 4217 4218 @Override 4219 public void endTransition(LayoutTransition transition, ViewGroup container, 4220 View view, int transitionType) { 4221 if (transitionType == LayoutTransition.DISAPPEARING && mTransitioningViews != null) { 4222 endViewTransition(view); 4223 } 4224 } 4225 }; 4226 4227 /** 4228 * {@inheritDoc} 4229 */ 4230 @Override 4231 public boolean gatherTransparentRegion(Region region) { 4232 // If no transparent regions requested, we are always opaque. 4233 final boolean meOpaque = (mPrivateFlags & View.REQUEST_TRANSPARENT_REGIONS) == 0; 4234 if (meOpaque && region == null) { 4235 // The caller doesn't care about the region, so stop now. 4236 return true; 4237 } 4238 super.gatherTransparentRegion(region); 4239 final View[] children = mChildren; 4240 final int count = mChildrenCount; 4241 boolean noneOfTheChildrenAreTransparent = true; 4242 for (int i = 0; i < count; i++) { 4243 final View child = children[i]; 4244 if ((child.mViewFlags & VISIBILITY_MASK) == VISIBLE || child.getAnimation() != null) { 4245 if (!child.gatherTransparentRegion(region)) { 4246 noneOfTheChildrenAreTransparent = false; 4247 } 4248 } 4249 } 4250 return meOpaque || noneOfTheChildrenAreTransparent; 4251 } 4252 4253 /** 4254 * {@inheritDoc} 4255 */ 4256 public void requestTransparentRegion(View child) { 4257 if (child != null) { 4258 child.mPrivateFlags |= View.REQUEST_TRANSPARENT_REGIONS; 4259 if (mParent != null) { 4260 mParent.requestTransparentRegion(this); 4261 } 4262 } 4263 } 4264 4265 4266 @Override 4267 protected boolean fitSystemWindows(Rect insets) { 4268 boolean done = super.fitSystemWindows(insets); 4269 if (!done) { 4270 final int count = mChildrenCount; 4271 final View[] children = mChildren; 4272 for (int i = 0; i < count; i++) { 4273 done = children[i].fitSystemWindows(insets); 4274 if (done) { 4275 break; 4276 } 4277 } 4278 } 4279 return done; 4280 } 4281 4282 /** 4283 * Returns the animation listener to which layout animation events are 4284 * sent. 4285 * 4286 * @return an {@link android.view.animation.Animation.AnimationListener} 4287 */ 4288 public Animation.AnimationListener getLayoutAnimationListener() { 4289 return mAnimationListener; 4290 } 4291 4292 @Override 4293 protected void drawableStateChanged() { 4294 super.drawableStateChanged(); 4295 4296 if ((mGroupFlags & FLAG_NOTIFY_CHILDREN_ON_DRAWABLE_STATE_CHANGE) != 0) { 4297 if ((mGroupFlags & FLAG_ADD_STATES_FROM_CHILDREN) != 0) { 4298 throw new IllegalStateException("addStateFromChildren cannot be enabled if a" 4299 + " child has duplicateParentState set to true"); 4300 } 4301 4302 final View[] children = mChildren; 4303 final int count = mChildrenCount; 4304 4305 for (int i = 0; i < count; i++) { 4306 final View child = children[i]; 4307 if ((child.mViewFlags & DUPLICATE_PARENT_STATE) != 0) { 4308 child.refreshDrawableState(); 4309 } 4310 } 4311 } 4312 } 4313 4314 @Override 4315 public void jumpDrawablesToCurrentState() { 4316 super.jumpDrawablesToCurrentState(); 4317 final View[] children = mChildren; 4318 final int count = mChildrenCount; 4319 for (int i = 0; i < count; i++) { 4320 children[i].jumpDrawablesToCurrentState(); 4321 } 4322 } 4323 4324 @Override 4325 protected int[] onCreateDrawableState(int extraSpace) { 4326 if ((mGroupFlags & FLAG_ADD_STATES_FROM_CHILDREN) == 0) { 4327 return super.onCreateDrawableState(extraSpace); 4328 } 4329 4330 int need = 0; 4331 int n = getChildCount(); 4332 for (int i = 0; i < n; i++) { 4333 int[] childState = getChildAt(i).getDrawableState(); 4334 4335 if (childState != null) { 4336 need += childState.length; 4337 } 4338 } 4339 4340 int[] state = super.onCreateDrawableState(extraSpace + need); 4341 4342 for (int i = 0; i < n; i++) { 4343 int[] childState = getChildAt(i).getDrawableState(); 4344 4345 if (childState != null) { 4346 state = mergeDrawableStates(state, childState); 4347 } 4348 } 4349 4350 return state; 4351 } 4352 4353 /** 4354 * Sets whether this ViewGroup's drawable states also include 4355 * its children's drawable states. This is used, for example, to 4356 * make a group appear to be focused when its child EditText or button 4357 * is focused. 4358 */ 4359 public void setAddStatesFromChildren(boolean addsStates) { 4360 if (addsStates) { 4361 mGroupFlags |= FLAG_ADD_STATES_FROM_CHILDREN; 4362 } else { 4363 mGroupFlags &= ~FLAG_ADD_STATES_FROM_CHILDREN; 4364 } 4365 4366 refreshDrawableState(); 4367 } 4368 4369 /** 4370 * Returns whether this ViewGroup's drawable states also include 4371 * its children's drawable states. This is used, for example, to 4372 * make a group appear to be focused when its child EditText or button 4373 * is focused. 4374 */ 4375 public boolean addStatesFromChildren() { 4376 return (mGroupFlags & FLAG_ADD_STATES_FROM_CHILDREN) != 0; 4377 } 4378 4379 /** 4380 * If {link #addStatesFromChildren} is true, refreshes this group's 4381 * drawable state (to include the states from its children). 4382 */ 4383 public void childDrawableStateChanged(View child) { 4384 if ((mGroupFlags & FLAG_ADD_STATES_FROM_CHILDREN) != 0) { 4385 refreshDrawableState(); 4386 } 4387 } 4388 4389 /** 4390 * Specifies the animation listener to which layout animation events must 4391 * be sent. Only 4392 * {@link android.view.animation.Animation.AnimationListener#onAnimationStart(Animation)} 4393 * and 4394 * {@link android.view.animation.Animation.AnimationListener#onAnimationEnd(Animation)} 4395 * are invoked. 4396 * 4397 * @param animationListener the layout animation listener 4398 */ 4399 public void setLayoutAnimationListener(Animation.AnimationListener animationListener) { 4400 mAnimationListener = animationListener; 4401 } 4402 4403 /** 4404 * LayoutParams are used by views to tell their parents how they want to be 4405 * laid out. See 4406 * {@link android.R.styleable#ViewGroup_Layout ViewGroup Layout Attributes} 4407 * for a list of all child view attributes that this class supports. 4408 * 4409 * <p> 4410 * The base LayoutParams class just describes how big the view wants to be 4411 * for both width and height. For each dimension, it can specify one of: 4412 * <ul> 4413 * <li>FILL_PARENT (renamed MATCH_PARENT in API Level 8 and higher), which 4414 * means that the view wants to be as big as its parent (minus padding) 4415 * <li> WRAP_CONTENT, which means that the view wants to be just big enough 4416 * to enclose its content (plus padding) 4417 * <li> an exact number 4418 * </ul> 4419 * There are subclasses of LayoutParams for different subclasses of 4420 * ViewGroup. For example, AbsoluteLayout has its own subclass of 4421 * LayoutParams which adds an X and Y value. 4422 * 4423 * @attr ref android.R.styleable#ViewGroup_Layout_layout_height 4424 * @attr ref android.R.styleable#ViewGroup_Layout_layout_width 4425 */ 4426 public static class LayoutParams { 4427 /** 4428 * Special value for the height or width requested by a View. 4429 * FILL_PARENT means that the view wants to be as big as its parent, 4430 * minus the parent's padding, if any. This value is deprecated 4431 * starting in API Level 8 and replaced by {@link #MATCH_PARENT}. 4432 */ 4433 @SuppressWarnings({"UnusedDeclaration"}) 4434 @Deprecated 4435 public static final int FILL_PARENT = -1; 4436 4437 /** 4438 * Special value for the height or width requested by a View. 4439 * MATCH_PARENT means that the view wants to be as big as its parent, 4440 * minus the parent's padding, if any. Introduced in API Level 8. 4441 */ 4442 public static final int MATCH_PARENT = -1; 4443 4444 /** 4445 * Special value for the height or width requested by a View. 4446 * WRAP_CONTENT means that the view wants to be just large enough to fit 4447 * its own internal content, taking its own padding into account. 4448 */ 4449 public static final int WRAP_CONTENT = -2; 4450 4451 /** 4452 * Information about how wide the view wants to be. Can be one of the 4453 * constants FILL_PARENT (replaced by MATCH_PARENT , 4454 * in API Level 8) or WRAP_CONTENT. or an exact size. 4455 */ 4456 @ViewDebug.ExportedProperty(category = "layout", mapping = { 4457 @ViewDebug.IntToString(from = MATCH_PARENT, to = "MATCH_PARENT"), 4458 @ViewDebug.IntToString(from = WRAP_CONTENT, to = "WRAP_CONTENT") 4459 }) 4460 public int width; 4461 4462 /** 4463 * Information about how tall the view wants to be. Can be one of the 4464 * constants FILL_PARENT (replaced by MATCH_PARENT , 4465 * in API Level 8) or WRAP_CONTENT. or an exact size. 4466 */ 4467 @ViewDebug.ExportedProperty(category = "layout", mapping = { 4468 @ViewDebug.IntToString(from = MATCH_PARENT, to = "MATCH_PARENT"), 4469 @ViewDebug.IntToString(from = WRAP_CONTENT, to = "WRAP_CONTENT") 4470 }) 4471 public int height; 4472 4473 /** 4474 * Used to animate layouts. 4475 */ 4476 public LayoutAnimationController.AnimationParameters layoutAnimationParameters; 4477 4478 /** 4479 * Creates a new set of layout parameters. The values are extracted from 4480 * the supplied attributes set and context. The XML attributes mapped 4481 * to this set of layout parameters are: 4482 * 4483 * <ul> 4484 * <li><code>layout_width</code>: the width, either an exact value, 4485 * {@link #WRAP_CONTENT}, or {@link #FILL_PARENT} (replaced by 4486 * {@link #MATCH_PARENT} in API Level 8)</li> 4487 * <li><code>layout_height</code>: the height, either an exact value, 4488 * {@link #WRAP_CONTENT}, or {@link #FILL_PARENT} (replaced by 4489 * {@link #MATCH_PARENT} in API Level 8)</li> 4490 * </ul> 4491 * 4492 * @param c the application environment 4493 * @param attrs the set of attributes from which to extract the layout 4494 * parameters' values 4495 */ 4496 public LayoutParams(Context c, AttributeSet attrs) { 4497 TypedArray a = c.obtainStyledAttributes(attrs, R.styleable.ViewGroup_Layout); 4498 setBaseAttributes(a, 4499 R.styleable.ViewGroup_Layout_layout_width, 4500 R.styleable.ViewGroup_Layout_layout_height); 4501 a.recycle(); 4502 } 4503 4504 /** 4505 * Creates a new set of layout parameters with the specified width 4506 * and height. 4507 * 4508 * @param width the width, either {@link #WRAP_CONTENT}, 4509 * {@link #FILL_PARENT} (replaced by {@link #MATCH_PARENT} in 4510 * API Level 8), or a fixed size in pixels 4511 * @param height the height, either {@link #WRAP_CONTENT}, 4512 * {@link #FILL_PARENT} (replaced by {@link #MATCH_PARENT} in 4513 * API Level 8), or a fixed size in pixels 4514 */ 4515 public LayoutParams(int width, int height) { 4516 this.width = width; 4517 this.height = height; 4518 } 4519 4520 /** 4521 * Copy constructor. Clones the width and height values of the source. 4522 * 4523 * @param source The layout params to copy from. 4524 */ 4525 public LayoutParams(LayoutParams source) { 4526 this.width = source.width; 4527 this.height = source.height; 4528 } 4529 4530 /** 4531 * Used internally by MarginLayoutParams. 4532 * @hide 4533 */ 4534 LayoutParams() { 4535 } 4536 4537 /** 4538 * Extracts the layout parameters from the supplied attributes. 4539 * 4540 * @param a the style attributes to extract the parameters from 4541 * @param widthAttr the identifier of the width attribute 4542 * @param heightAttr the identifier of the height attribute 4543 */ 4544 protected void setBaseAttributes(TypedArray a, int widthAttr, int heightAttr) { 4545 width = a.getLayoutDimension(widthAttr, "layout_width"); 4546 height = a.getLayoutDimension(heightAttr, "layout_height"); 4547 } 4548 4549 /** 4550 * Returns a String representation of this set of layout parameters. 4551 * 4552 * @param output the String to prepend to the internal representation 4553 * @return a String with the following format: output + 4554 * "ViewGroup.LayoutParams={ width=WIDTH, height=HEIGHT }" 4555 * 4556 * @hide 4557 */ 4558 public String debug(String output) { 4559 return output + "ViewGroup.LayoutParams={ width=" 4560 + sizeToString(width) + ", height=" + sizeToString(height) + " }"; 4561 } 4562 4563 /** 4564 * Converts the specified size to a readable String. 4565 * 4566 * @param size the size to convert 4567 * @return a String instance representing the supplied size 4568 * 4569 * @hide 4570 */ 4571 protected static String sizeToString(int size) { 4572 if (size == WRAP_CONTENT) { 4573 return "wrap-content"; 4574 } 4575 if (size == MATCH_PARENT) { 4576 return "match-parent"; 4577 } 4578 return String.valueOf(size); 4579 } 4580 } 4581 4582 /** 4583 * Per-child layout information for layouts that support margins. 4584 * See 4585 * {@link android.R.styleable#ViewGroup_MarginLayout ViewGroup Margin Layout Attributes} 4586 * for a list of all child view attributes that this class supports. 4587 */ 4588 public static class MarginLayoutParams extends ViewGroup.LayoutParams { 4589 /** 4590 * The left margin in pixels of the child. 4591 */ 4592 @ViewDebug.ExportedProperty(category = "layout") 4593 public int leftMargin; 4594 4595 /** 4596 * The top margin in pixels of the child. 4597 */ 4598 @ViewDebug.ExportedProperty(category = "layout") 4599 public int topMargin; 4600 4601 /** 4602 * The right margin in pixels of the child. 4603 */ 4604 @ViewDebug.ExportedProperty(category = "layout") 4605 public int rightMargin; 4606 4607 /** 4608 * The bottom margin in pixels of the child. 4609 */ 4610 @ViewDebug.ExportedProperty(category = "layout") 4611 public int bottomMargin; 4612 4613 /** 4614 * Creates a new set of layout parameters. The values are extracted from 4615 * the supplied attributes set and context. 4616 * 4617 * @param c the application environment 4618 * @param attrs the set of attributes from which to extract the layout 4619 * parameters' values 4620 */ 4621 public MarginLayoutParams(Context c, AttributeSet attrs) { 4622 super(); 4623 4624 TypedArray a = c.obtainStyledAttributes(attrs, R.styleable.ViewGroup_MarginLayout); 4625 setBaseAttributes(a, 4626 R.styleable.ViewGroup_MarginLayout_layout_width, 4627 R.styleable.ViewGroup_MarginLayout_layout_height); 4628 4629 int margin = a.getDimensionPixelSize( 4630 com.android.internal.R.styleable.ViewGroup_MarginLayout_layout_margin, -1); 4631 if (margin >= 0) { 4632 leftMargin = margin; 4633 topMargin = margin; 4634 rightMargin= margin; 4635 bottomMargin = margin; 4636 } else { 4637 leftMargin = a.getDimensionPixelSize( 4638 R.styleable.ViewGroup_MarginLayout_layout_marginLeft, 0); 4639 topMargin = a.getDimensionPixelSize( 4640 R.styleable.ViewGroup_MarginLayout_layout_marginTop, 0); 4641 rightMargin = a.getDimensionPixelSize( 4642 R.styleable.ViewGroup_MarginLayout_layout_marginRight, 0); 4643 bottomMargin = a.getDimensionPixelSize( 4644 R.styleable.ViewGroup_MarginLayout_layout_marginBottom, 0); 4645 } 4646 4647 a.recycle(); 4648 } 4649 4650 /** 4651 * {@inheritDoc} 4652 */ 4653 public MarginLayoutParams(int width, int height) { 4654 super(width, height); 4655 } 4656 4657 /** 4658 * Copy constructor. Clones the width, height and margin values of the source. 4659 * 4660 * @param source The layout params to copy from. 4661 */ 4662 public MarginLayoutParams(MarginLayoutParams source) { 4663 this.width = source.width; 4664 this.height = source.height; 4665 4666 this.leftMargin = source.leftMargin; 4667 this.topMargin = source.topMargin; 4668 this.rightMargin = source.rightMargin; 4669 this.bottomMargin = source.bottomMargin; 4670 } 4671 4672 /** 4673 * {@inheritDoc} 4674 */ 4675 public MarginLayoutParams(LayoutParams source) { 4676 super(source); 4677 } 4678 4679 /** 4680 * Sets the margins, in pixels. 4681 * 4682 * @param left the left margin size 4683 * @param top the top margin size 4684 * @param right the right margin size 4685 * @param bottom the bottom margin size 4686 * 4687 * @attr ref android.R.styleable#ViewGroup_MarginLayout_layout_marginLeft 4688 * @attr ref android.R.styleable#ViewGroup_MarginLayout_layout_marginTop 4689 * @attr ref android.R.styleable#ViewGroup_MarginLayout_layout_marginRight 4690 * @attr ref android.R.styleable#ViewGroup_MarginLayout_layout_marginBottom 4691 */ 4692 public void setMargins(int left, int top, int right, int bottom) { 4693 leftMargin = left; 4694 topMargin = top; 4695 rightMargin = right; 4696 bottomMargin = bottom; 4697 } 4698 } 4699 4700 /* Describes a touched view and the ids of the pointers that it has captured. 4701 * 4702 * This code assumes that pointer ids are always in the range 0..31 such that 4703 * it can use a bitfield to track which pointer ids are present. 4704 * As it happens, the lower layers of the input dispatch pipeline also use the 4705 * same trick so the assumption should be safe here... 4706 */ 4707 private static final class TouchTarget { 4708 private static final int MAX_RECYCLED = 32; 4709 private static final Object sRecycleLock = new Object(); 4710 private static TouchTarget sRecycleBin; 4711 private static int sRecycledCount; 4712 4713 public static final int ALL_POINTER_IDS = -1; // all ones 4714 4715 // The touched child view. 4716 public View child; 4717 4718 // The combined bit mask of pointer ids for all pointers captured by the target. 4719 public int pointerIdBits; 4720 4721 // The next target in the target list. 4722 public TouchTarget next; 4723 4724 private TouchTarget() { 4725 } 4726 4727 public static TouchTarget obtain(View child, int pointerIdBits) { 4728 final TouchTarget target; 4729 synchronized (sRecycleLock) { 4730 if (sRecycleBin == null) { 4731 target = new TouchTarget(); 4732 } else { 4733 target = sRecycleBin; 4734 sRecycleBin = target.next; 4735 sRecycledCount--; 4736 target.next = null; 4737 } 4738 } 4739 target.child = child; 4740 target.pointerIdBits = pointerIdBits; 4741 return target; 4742 } 4743 4744 public void recycle() { 4745 synchronized (sRecycleLock) { 4746 if (sRecycledCount < MAX_RECYCLED) { 4747 next = sRecycleBin; 4748 sRecycleBin = this; 4749 sRecycledCount += 1; 4750 } else { 4751 next = null; 4752 } 4753 child = null; 4754 } 4755 } 4756 } 4757} 4758