ViewGroup.java revision f37df070ea84c353ff8bed4b2591932126d7e2ca
1/* 2 * Copyright (C) 2006 The Android Open Source Project 3 * 4 * Licensed under the Apache License, Version 2.0 (the "License"); 5 * you may not use this file except in compliance with the License. 6 * You may obtain a copy of the License at 7 * 8 * http://www.apache.org/licenses/LICENSE-2.0 9 * 10 * Unless required by applicable law or agreed to in writing, software 11 * distributed under the License is distributed on an "AS IS" BASIS, 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 13 * See the License for the specific language governing permissions and 14 * limitations under the License. 15 */ 16 17package android.view; 18 19import android.animation.LayoutTransition; 20import com.android.internal.R; 21 22import android.content.Context; 23import android.content.res.Configuration; 24import android.content.res.TypedArray; 25import android.graphics.Bitmap; 26import android.graphics.Canvas; 27import android.graphics.Matrix; 28import android.graphics.Paint; 29import android.graphics.Rect; 30import android.graphics.RectF; 31import android.graphics.Region; 32import android.os.Parcelable; 33import android.os.SystemClock; 34import android.util.AttributeSet; 35import android.util.Log; 36import android.util.SparseArray; 37import android.view.accessibility.AccessibilityEvent; 38import android.view.animation.Animation; 39import android.view.animation.AnimationUtils; 40import android.view.animation.LayoutAnimationController; 41import android.view.animation.Transformation; 42 43import java.util.ArrayList; 44 45/** 46 * <p> 47 * A <code>ViewGroup</code> is a special view that can contain other views 48 * (called children.) The view group is the base class for layouts and views 49 * containers. This class also defines the 50 * {@link android.view.ViewGroup.LayoutParams} class which serves as the base 51 * class for layouts parameters. 52 * </p> 53 * 54 * <p> 55 * Also see {@link LayoutParams} for layout attributes. 56 * </p> 57 * 58 * @attr ref android.R.styleable#ViewGroup_clipChildren 59 * @attr ref android.R.styleable#ViewGroup_clipToPadding 60 * @attr ref android.R.styleable#ViewGroup_layoutAnimation 61 * @attr ref android.R.styleable#ViewGroup_animationCache 62 * @attr ref android.R.styleable#ViewGroup_persistentDrawingCache 63 * @attr ref android.R.styleable#ViewGroup_alwaysDrawnWithCache 64 * @attr ref android.R.styleable#ViewGroup_addStatesFromChildren 65 * @attr ref android.R.styleable#ViewGroup_descendantFocusability 66 * @attr ref android.R.styleable#ViewGroup_animateLayoutChanges 67 */ 68public abstract class ViewGroup extends View implements ViewParent, ViewManager { 69 70 private static final boolean DBG = false; 71 72 /** 73 * Views which have been hidden or removed which need to be animated on 74 * their way out. 75 * This field should be made private, so it is hidden from the SDK. 76 * {@hide} 77 */ 78 protected ArrayList<View> mDisappearingChildren; 79 80 /** 81 * Listener used to propagate events indicating when children are added 82 * and/or removed from a view group. 83 * This field should be made private, so it is hidden from the SDK. 84 * {@hide} 85 */ 86 protected OnHierarchyChangeListener mOnHierarchyChangeListener; 87 88 // The view contained within this ViewGroup that has or contains focus. 89 private View mFocused; 90 91 /** 92 * A Transformation used when drawing children, to 93 * apply on the child being drawn. 94 */ 95 private final Transformation mChildTransformation = new Transformation(); 96 97 /** 98 * Used to track the current invalidation region. 99 */ 100 private RectF mInvalidateRegion; 101 102 /** 103 * A Transformation used to calculate a correct 104 * invalidation area when the application is autoscaled. 105 */ 106 private Transformation mInvalidationTransformation; 107 108 // Target of Motion events 109 private View mMotionTarget; 110 111 // Targets of MotionEvents in split mode 112 private SplitMotionTargets mSplitMotionTargets; 113 114 // Layout animation 115 private LayoutAnimationController mLayoutAnimationController; 116 private Animation.AnimationListener mAnimationListener; 117 118 /** 119 * Internal flags. 120 * 121 * This field should be made private, so it is hidden from the SDK. 122 * {@hide} 123 */ 124 protected int mGroupFlags; 125 126 // When set, ViewGroup invalidates only the child's rectangle 127 // Set by default 128 private static final int FLAG_CLIP_CHILDREN = 0x1; 129 130 // When set, ViewGroup excludes the padding area from the invalidate rectangle 131 // Set by default 132 private static final int FLAG_CLIP_TO_PADDING = 0x2; 133 134 // When set, dispatchDraw() will invoke invalidate(); this is set by drawChild() when 135 // a child needs to be invalidated and FLAG_OPTIMIZE_INVALIDATE is set 136 private static final int FLAG_INVALIDATE_REQUIRED = 0x4; 137 138 // When set, dispatchDraw() will run the layout animation and unset the flag 139 private static final int FLAG_RUN_ANIMATION = 0x8; 140 141 // When set, there is either no layout animation on the ViewGroup or the layout 142 // animation is over 143 // Set by default 144 private static final int FLAG_ANIMATION_DONE = 0x10; 145 146 // If set, this ViewGroup has padding; if unset there is no padding and we don't need 147 // to clip it, even if FLAG_CLIP_TO_PADDING is set 148 private static final int FLAG_PADDING_NOT_NULL = 0x20; 149 150 // When set, this ViewGroup caches its children in a Bitmap before starting a layout animation 151 // Set by default 152 private static final int FLAG_ANIMATION_CACHE = 0x40; 153 154 // When set, this ViewGroup converts calls to invalidate(Rect) to invalidate() during a 155 // layout animation; this avoid clobbering the hierarchy 156 // Automatically set when the layout animation starts, depending on the animation's 157 // characteristics 158 private static final int FLAG_OPTIMIZE_INVALIDATE = 0x80; 159 160 // When set, the next call to drawChild() will clear mChildTransformation's matrix 161 private static final int FLAG_CLEAR_TRANSFORMATION = 0x100; 162 163 // When set, this ViewGroup invokes mAnimationListener.onAnimationEnd() and removes 164 // the children's Bitmap caches if necessary 165 // This flag is set when the layout animation is over (after FLAG_ANIMATION_DONE is set) 166 private static final int FLAG_NOTIFY_ANIMATION_LISTENER = 0x200; 167 168 /** 169 * When set, the drawing method will call {@link #getChildDrawingOrder(int, int)} 170 * to get the index of the child to draw for that iteration. 171 * 172 * @hide 173 */ 174 protected static final int FLAG_USE_CHILD_DRAWING_ORDER = 0x400; 175 176 /** 177 * When set, this ViewGroup supports static transformations on children; this causes 178 * {@link #getChildStaticTransformation(View, android.view.animation.Transformation)} to be 179 * invoked when a child is drawn. 180 * 181 * Any subclass overriding 182 * {@link #getChildStaticTransformation(View, android.view.animation.Transformation)} should 183 * set this flags in {@link #mGroupFlags}. 184 * 185 * {@hide} 186 */ 187 protected static final int FLAG_SUPPORT_STATIC_TRANSFORMATIONS = 0x800; 188 189 // When the previous drawChild() invocation used an alpha value that was lower than 190 // 1.0 and set it in mCachePaint 191 private static final int FLAG_ALPHA_LOWER_THAN_ONE = 0x1000; 192 193 /** 194 * When set, this ViewGroup's drawable states also include those 195 * of its children. 196 */ 197 private static final int FLAG_ADD_STATES_FROM_CHILDREN = 0x2000; 198 199 /** 200 * When set, this ViewGroup tries to always draw its children using their drawing cache. 201 */ 202 private static final int FLAG_ALWAYS_DRAWN_WITH_CACHE = 0x4000; 203 204 /** 205 * When set, and if FLAG_ALWAYS_DRAWN_WITH_CACHE is not set, this ViewGroup will try to 206 * draw its children with their drawing cache. 207 */ 208 private static final int FLAG_CHILDREN_DRAWN_WITH_CACHE = 0x8000; 209 210 /** 211 * When set, this group will go through its list of children to notify them of 212 * any drawable state change. 213 */ 214 private static final int FLAG_NOTIFY_CHILDREN_ON_DRAWABLE_STATE_CHANGE = 0x10000; 215 216 private static final int FLAG_MASK_FOCUSABILITY = 0x60000; 217 218 /** 219 * This view will get focus before any of its descendants. 220 */ 221 public static final int FOCUS_BEFORE_DESCENDANTS = 0x20000; 222 223 /** 224 * This view will get focus only if none of its descendants want it. 225 */ 226 public static final int FOCUS_AFTER_DESCENDANTS = 0x40000; 227 228 /** 229 * This view will block any of its descendants from getting focus, even 230 * if they are focusable. 231 */ 232 public static final int FOCUS_BLOCK_DESCENDANTS = 0x60000; 233 234 /** 235 * Used to map between enum in attrubutes and flag values. 236 */ 237 private static final int[] DESCENDANT_FOCUSABILITY_FLAGS = 238 {FOCUS_BEFORE_DESCENDANTS, FOCUS_AFTER_DESCENDANTS, 239 FOCUS_BLOCK_DESCENDANTS}; 240 241 /** 242 * When set, this ViewGroup should not intercept touch events. 243 * {@hide} 244 */ 245 protected static final int FLAG_DISALLOW_INTERCEPT = 0x80000; 246 247 /** 248 * When set, at least one child of this ViewGroup will return true from hasOverlay. 249 */ 250 private static final int FLAG_CHILD_HAS_OVERLAY = 0x100000; 251 252 /** 253 * When set, this ViewGroup will split MotionEvents to multiple child Views when appropriate. 254 */ 255 private static final int FLAG_SPLIT_MOTION_EVENTS = 0x200000; 256 257 /** 258 * Indicates which types of drawing caches are to be kept in memory. 259 * This field should be made private, so it is hidden from the SDK. 260 * {@hide} 261 */ 262 protected int mPersistentDrawingCache; 263 264 /** 265 * Used to indicate that no drawing cache should be kept in memory. 266 */ 267 public static final int PERSISTENT_NO_CACHE = 0x0; 268 269 /** 270 * Used to indicate that the animation drawing cache should be kept in memory. 271 */ 272 public static final int PERSISTENT_ANIMATION_CACHE = 0x1; 273 274 /** 275 * Used to indicate that the scrolling drawing cache should be kept in memory. 276 */ 277 public static final int PERSISTENT_SCROLLING_CACHE = 0x2; 278 279 /** 280 * Used to indicate that all drawing caches should be kept in memory. 281 */ 282 public static final int PERSISTENT_ALL_CACHES = 0x3; 283 284 /** 285 * We clip to padding when FLAG_CLIP_TO_PADDING and FLAG_PADDING_NOT_NULL 286 * are set at the same time. 287 */ 288 protected static final int CLIP_TO_PADDING_MASK = FLAG_CLIP_TO_PADDING | FLAG_PADDING_NOT_NULL; 289 290 // Index of the child's left position in the mLocation array 291 private static final int CHILD_LEFT_INDEX = 0; 292 // Index of the child's top position in the mLocation array 293 private static final int CHILD_TOP_INDEX = 1; 294 295 // Child views of this ViewGroup 296 private View[] mChildren; 297 // Number of valid children in the mChildren array, the rest should be null or not 298 // considered as children 299 private int mChildrenCount; 300 301 private static final int ARRAY_INITIAL_CAPACITY = 12; 302 private static final int ARRAY_CAPACITY_INCREMENT = 12; 303 304 // Used to draw cached views 305 private final Paint mCachePaint = new Paint(); 306 307 // Used to animate add/remove changes in layout 308 private LayoutTransition mTransition; 309 310 // The set of views that are currently being transitioned. This list is used to track views 311 // being removed that should not actually be removed from the parent yet because they are 312 // being animated. 313 private ArrayList<View> mTransitioningViews; 314 315 public ViewGroup(Context context) { 316 super(context); 317 initViewGroup(); 318 } 319 320 public ViewGroup(Context context, AttributeSet attrs) { 321 super(context, attrs); 322 initViewGroup(); 323 initFromAttributes(context, attrs); 324 } 325 326 public ViewGroup(Context context, AttributeSet attrs, int defStyle) { 327 super(context, attrs, defStyle); 328 initViewGroup(); 329 initFromAttributes(context, attrs); 330 } 331 332 private void initViewGroup() { 333 // ViewGroup doesn't draw by default 334 setFlags(WILL_NOT_DRAW, DRAW_MASK); 335 mGroupFlags |= FLAG_CLIP_CHILDREN; 336 mGroupFlags |= FLAG_CLIP_TO_PADDING; 337 mGroupFlags |= FLAG_ANIMATION_DONE; 338 mGroupFlags |= FLAG_ANIMATION_CACHE; 339 mGroupFlags |= FLAG_ALWAYS_DRAWN_WITH_CACHE; 340 341 setDescendantFocusability(FOCUS_BEFORE_DESCENDANTS); 342 343 mChildren = new View[ARRAY_INITIAL_CAPACITY]; 344 mChildrenCount = 0; 345 346 mCachePaint.setDither(false); 347 348 mPersistentDrawingCache = PERSISTENT_SCROLLING_CACHE; 349 } 350 351 private void initFromAttributes(Context context, AttributeSet attrs) { 352 TypedArray a = context.obtainStyledAttributes(attrs, 353 R.styleable.ViewGroup); 354 355 final int N = a.getIndexCount(); 356 for (int i = 0; i < N; i++) { 357 int attr = a.getIndex(i); 358 switch (attr) { 359 case R.styleable.ViewGroup_clipChildren: 360 setClipChildren(a.getBoolean(attr, true)); 361 break; 362 case R.styleable.ViewGroup_clipToPadding: 363 setClipToPadding(a.getBoolean(attr, true)); 364 break; 365 case R.styleable.ViewGroup_animationCache: 366 setAnimationCacheEnabled(a.getBoolean(attr, true)); 367 break; 368 case R.styleable.ViewGroup_persistentDrawingCache: 369 setPersistentDrawingCache(a.getInt(attr, PERSISTENT_SCROLLING_CACHE)); 370 break; 371 case R.styleable.ViewGroup_addStatesFromChildren: 372 setAddStatesFromChildren(a.getBoolean(attr, false)); 373 break; 374 case R.styleable.ViewGroup_alwaysDrawnWithCache: 375 setAlwaysDrawnWithCacheEnabled(a.getBoolean(attr, true)); 376 break; 377 case R.styleable.ViewGroup_layoutAnimation: 378 int id = a.getResourceId(attr, -1); 379 if (id > 0) { 380 setLayoutAnimation(AnimationUtils.loadLayoutAnimation(mContext, id)); 381 } 382 break; 383 case R.styleable.ViewGroup_descendantFocusability: 384 setDescendantFocusability(DESCENDANT_FOCUSABILITY_FLAGS[a.getInt(attr, 0)]); 385 break; 386 case R.styleable.ViewGroup_splitMotionEvents: 387 setMotionEventSplittingEnabled(a.getBoolean(attr, false)); 388 break; 389 case R.styleable.ViewGroup_animateLayoutChanges: 390 boolean animateLayoutChanges = a.getBoolean(attr, false); 391 if (animateLayoutChanges) { 392 setLayoutTransition(new LayoutTransition()); 393 } 394 break; 395 } 396 } 397 398 a.recycle(); 399 } 400 401 /** 402 * Gets the descendant focusability of this view group. The descendant 403 * focusability defines the relationship between this view group and its 404 * descendants when looking for a view to take focus in 405 * {@link #requestFocus(int, android.graphics.Rect)}. 406 * 407 * @return one of {@link #FOCUS_BEFORE_DESCENDANTS}, {@link #FOCUS_AFTER_DESCENDANTS}, 408 * {@link #FOCUS_BLOCK_DESCENDANTS}. 409 */ 410 @ViewDebug.ExportedProperty(category = "focus", mapping = { 411 @ViewDebug.IntToString(from = FOCUS_BEFORE_DESCENDANTS, to = "FOCUS_BEFORE_DESCENDANTS"), 412 @ViewDebug.IntToString(from = FOCUS_AFTER_DESCENDANTS, to = "FOCUS_AFTER_DESCENDANTS"), 413 @ViewDebug.IntToString(from = FOCUS_BLOCK_DESCENDANTS, to = "FOCUS_BLOCK_DESCENDANTS") 414 }) 415 public int getDescendantFocusability() { 416 return mGroupFlags & FLAG_MASK_FOCUSABILITY; 417 } 418 419 /** 420 * Set the descendant focusability of this view group. This defines the relationship 421 * between this view group and its descendants when looking for a view to 422 * take focus in {@link #requestFocus(int, android.graphics.Rect)}. 423 * 424 * @param focusability one of {@link #FOCUS_BEFORE_DESCENDANTS}, {@link #FOCUS_AFTER_DESCENDANTS}, 425 * {@link #FOCUS_BLOCK_DESCENDANTS}. 426 */ 427 public void setDescendantFocusability(int focusability) { 428 switch (focusability) { 429 case FOCUS_BEFORE_DESCENDANTS: 430 case FOCUS_AFTER_DESCENDANTS: 431 case FOCUS_BLOCK_DESCENDANTS: 432 break; 433 default: 434 throw new IllegalArgumentException("must be one of FOCUS_BEFORE_DESCENDANTS, " 435 + "FOCUS_AFTER_DESCENDANTS, FOCUS_BLOCK_DESCENDANTS"); 436 } 437 mGroupFlags &= ~FLAG_MASK_FOCUSABILITY; 438 mGroupFlags |= (focusability & FLAG_MASK_FOCUSABILITY); 439 } 440 441 /** 442 * {@inheritDoc} 443 */ 444 @Override 445 void handleFocusGainInternal(int direction, Rect previouslyFocusedRect) { 446 if (mFocused != null) { 447 mFocused.unFocus(); 448 mFocused = null; 449 } 450 super.handleFocusGainInternal(direction, previouslyFocusedRect); 451 } 452 453 /** 454 * {@inheritDoc} 455 */ 456 public void requestChildFocus(View child, View focused) { 457 if (DBG) { 458 System.out.println(this + " requestChildFocus()"); 459 } 460 if (getDescendantFocusability() == FOCUS_BLOCK_DESCENDANTS) { 461 return; 462 } 463 464 // Unfocus us, if necessary 465 super.unFocus(); 466 467 // We had a previous notion of who had focus. Clear it. 468 if (mFocused != child) { 469 if (mFocused != null) { 470 mFocused.unFocus(); 471 } 472 473 mFocused = child; 474 } 475 if (mParent != null) { 476 mParent.requestChildFocus(this, focused); 477 } 478 } 479 480 /** 481 * {@inheritDoc} 482 */ 483 public void focusableViewAvailable(View v) { 484 if (mParent != null 485 // shortcut: don't report a new focusable view if we block our descendants from 486 // getting focus 487 && (getDescendantFocusability() != FOCUS_BLOCK_DESCENDANTS) 488 // shortcut: don't report a new focusable view if we already are focused 489 // (and we don't prefer our descendants) 490 // 491 // note: knowing that mFocused is non-null is not a good enough reason 492 // to break the traversal since in that case we'd actually have to find 493 // the focused view and make sure it wasn't FOCUS_AFTER_DESCENDANTS and 494 // an ancestor of v; this will get checked for at ViewRoot 495 && !(isFocused() && getDescendantFocusability() != FOCUS_AFTER_DESCENDANTS)) { 496 mParent.focusableViewAvailable(v); 497 } 498 } 499 500 /** 501 * {@inheritDoc} 502 */ 503 public boolean showContextMenuForChild(View originalView) { 504 return mParent != null && mParent.showContextMenuForChild(originalView); 505 } 506 507 /** 508 * {@inheritDoc} 509 */ 510 public ActionMode startActionModeForChild(View originalView, ActionMode.Callback callback) { 511 return mParent != null ? mParent.startActionModeForChild(originalView, callback) : null; 512 } 513 514 /** 515 * Find the nearest view in the specified direction that wants to take 516 * focus. 517 * 518 * @param focused The view that currently has focus 519 * @param direction One of FOCUS_UP, FOCUS_DOWN, FOCUS_LEFT, and 520 * FOCUS_RIGHT, or 0 for not applicable. 521 */ 522 public View focusSearch(View focused, int direction) { 523 if (isRootNamespace()) { 524 // root namespace means we should consider ourselves the top of the 525 // tree for focus searching; otherwise we could be focus searching 526 // into other tabs. see LocalActivityManager and TabHost for more info 527 return FocusFinder.getInstance().findNextFocus(this, focused, direction); 528 } else if (mParent != null) { 529 return mParent.focusSearch(focused, direction); 530 } 531 return null; 532 } 533 534 /** 535 * {@inheritDoc} 536 */ 537 public boolean requestChildRectangleOnScreen(View child, Rect rectangle, boolean immediate) { 538 return false; 539 } 540 541 /** 542 * {@inheritDoc} 543 */ 544 @Override 545 public boolean dispatchUnhandledMove(View focused, int direction) { 546 return mFocused != null && 547 mFocused.dispatchUnhandledMove(focused, direction); 548 } 549 550 /** 551 * {@inheritDoc} 552 */ 553 public void clearChildFocus(View child) { 554 if (DBG) { 555 System.out.println(this + " clearChildFocus()"); 556 } 557 558 mFocused = null; 559 if (mParent != null) { 560 mParent.clearChildFocus(this); 561 } 562 } 563 564 /** 565 * {@inheritDoc} 566 */ 567 @Override 568 public void clearFocus() { 569 super.clearFocus(); 570 571 // clear any child focus if it exists 572 if (mFocused != null) { 573 mFocused.clearFocus(); 574 } 575 } 576 577 /** 578 * {@inheritDoc} 579 */ 580 @Override 581 void unFocus() { 582 if (DBG) { 583 System.out.println(this + " unFocus()"); 584 } 585 586 super.unFocus(); 587 if (mFocused != null) { 588 mFocused.unFocus(); 589 } 590 mFocused = null; 591 } 592 593 /** 594 * Returns the focused child of this view, if any. The child may have focus 595 * or contain focus. 596 * 597 * @return the focused child or null. 598 */ 599 public View getFocusedChild() { 600 return mFocused; 601 } 602 603 /** 604 * Returns true if this view has or contains focus 605 * 606 * @return true if this view has or contains focus 607 */ 608 @Override 609 public boolean hasFocus() { 610 return (mPrivateFlags & FOCUSED) != 0 || mFocused != null; 611 } 612 613 /* 614 * (non-Javadoc) 615 * 616 * @see android.view.View#findFocus() 617 */ 618 @Override 619 public View findFocus() { 620 if (DBG) { 621 System.out.println("Find focus in " + this + ": flags=" 622 + isFocused() + ", child=" + mFocused); 623 } 624 625 if (isFocused()) { 626 return this; 627 } 628 629 if (mFocused != null) { 630 return mFocused.findFocus(); 631 } 632 return null; 633 } 634 635 /** 636 * {@inheritDoc} 637 */ 638 @Override 639 public boolean hasFocusable() { 640 if ((mViewFlags & VISIBILITY_MASK) != VISIBLE) { 641 return false; 642 } 643 644 if (isFocusable()) { 645 return true; 646 } 647 648 final int descendantFocusability = getDescendantFocusability(); 649 if (descendantFocusability != FOCUS_BLOCK_DESCENDANTS) { 650 final int count = mChildrenCount; 651 final View[] children = mChildren; 652 653 for (int i = 0; i < count; i++) { 654 final View child = children[i]; 655 if (child.hasFocusable()) { 656 return true; 657 } 658 } 659 } 660 661 return false; 662 } 663 664 /** 665 * {@inheritDoc} 666 */ 667 @Override 668 public void addFocusables(ArrayList<View> views, int direction) { 669 addFocusables(views, direction, FOCUSABLES_TOUCH_MODE); 670 } 671 672 /** 673 * {@inheritDoc} 674 */ 675 @Override 676 public void addFocusables(ArrayList<View> views, int direction, int focusableMode) { 677 final int focusableCount = views.size(); 678 679 final int descendantFocusability = getDescendantFocusability(); 680 681 if (descendantFocusability != FOCUS_BLOCK_DESCENDANTS) { 682 final int count = mChildrenCount; 683 final View[] children = mChildren; 684 685 for (int i = 0; i < count; i++) { 686 final View child = children[i]; 687 if ((child.mViewFlags & VISIBILITY_MASK) == VISIBLE) { 688 child.addFocusables(views, direction, focusableMode); 689 } 690 } 691 } 692 693 // we add ourselves (if focusable) in all cases except for when we are 694 // FOCUS_AFTER_DESCENDANTS and there are some descendants focusable. this is 695 // to avoid the focus search finding layouts when a more precise search 696 // among the focusable children would be more interesting. 697 if ( 698 descendantFocusability != FOCUS_AFTER_DESCENDANTS || 699 // No focusable descendants 700 (focusableCount == views.size())) { 701 super.addFocusables(views, direction, focusableMode); 702 } 703 } 704 705 /** 706 * {@inheritDoc} 707 */ 708 @Override 709 public void dispatchWindowFocusChanged(boolean hasFocus) { 710 super.dispatchWindowFocusChanged(hasFocus); 711 final int count = mChildrenCount; 712 final View[] children = mChildren; 713 for (int i = 0; i < count; i++) { 714 children[i].dispatchWindowFocusChanged(hasFocus); 715 } 716 } 717 718 /** 719 * {@inheritDoc} 720 */ 721 @Override 722 public void addTouchables(ArrayList<View> views) { 723 super.addTouchables(views); 724 725 final int count = mChildrenCount; 726 final View[] children = mChildren; 727 728 for (int i = 0; i < count; i++) { 729 final View child = children[i]; 730 if ((child.mViewFlags & VISIBILITY_MASK) == VISIBLE) { 731 child.addTouchables(views); 732 } 733 } 734 } 735 736 /** 737 * {@inheritDoc} 738 */ 739 @Override 740 public void dispatchDisplayHint(int hint) { 741 super.dispatchDisplayHint(hint); 742 final int count = mChildrenCount; 743 final View[] children = mChildren; 744 for (int i = 0; i < count; i++) { 745 children[i].dispatchDisplayHint(hint); 746 } 747 } 748 749 /** 750 * {@inheritDoc} 751 */ 752 @Override 753 protected void dispatchVisibilityChanged(View changedView, int visibility) { 754 super.dispatchVisibilityChanged(changedView, visibility); 755 final int count = mChildrenCount; 756 final View[] children = mChildren; 757 for (int i = 0; i < count; i++) { 758 children[i].dispatchVisibilityChanged(changedView, visibility); 759 } 760 } 761 762 /** 763 * {@inheritDoc} 764 */ 765 @Override 766 public void dispatchWindowVisibilityChanged(int visibility) { 767 super.dispatchWindowVisibilityChanged(visibility); 768 final int count = mChildrenCount; 769 final View[] children = mChildren; 770 for (int i = 0; i < count; i++) { 771 children[i].dispatchWindowVisibilityChanged(visibility); 772 } 773 } 774 775 /** 776 * {@inheritDoc} 777 */ 778 @Override 779 public void dispatchConfigurationChanged(Configuration newConfig) { 780 super.dispatchConfigurationChanged(newConfig); 781 final int count = mChildrenCount; 782 final View[] children = mChildren; 783 for (int i = 0; i < count; i++) { 784 children[i].dispatchConfigurationChanged(newConfig); 785 } 786 } 787 788 /** 789 * {@inheritDoc} 790 */ 791 public void recomputeViewAttributes(View child) { 792 ViewParent parent = mParent; 793 if (parent != null) parent.recomputeViewAttributes(this); 794 } 795 796 @Override 797 void dispatchCollectViewAttributes(int visibility) { 798 visibility |= mViewFlags&VISIBILITY_MASK; 799 super.dispatchCollectViewAttributes(visibility); 800 final int count = mChildrenCount; 801 final View[] children = mChildren; 802 for (int i = 0; i < count; i++) { 803 children[i].dispatchCollectViewAttributes(visibility); 804 } 805 } 806 807 /** 808 * {@inheritDoc} 809 */ 810 public void bringChildToFront(View child) { 811 int index = indexOfChild(child); 812 if (index >= 0) { 813 removeFromArray(index); 814 addInArray(child, mChildrenCount); 815 child.mParent = this; 816 } 817 } 818 819 /** 820 * {@inheritDoc} 821 */ 822 @Override 823 public boolean dispatchKeyEventPreIme(KeyEvent event) { 824 if ((mPrivateFlags & (FOCUSED | HAS_BOUNDS)) == (FOCUSED | HAS_BOUNDS)) { 825 return super.dispatchKeyEventPreIme(event); 826 } else if (mFocused != null && (mFocused.mPrivateFlags & HAS_BOUNDS) == HAS_BOUNDS) { 827 return mFocused.dispatchKeyEventPreIme(event); 828 } 829 return false; 830 } 831 832 /** 833 * {@inheritDoc} 834 */ 835 @Override 836 public boolean dispatchKeyEvent(KeyEvent event) { 837 if ((mPrivateFlags & (FOCUSED | HAS_BOUNDS)) == (FOCUSED | HAS_BOUNDS)) { 838 return super.dispatchKeyEvent(event); 839 } else if (mFocused != null && (mFocused.mPrivateFlags & HAS_BOUNDS) == HAS_BOUNDS) { 840 return mFocused.dispatchKeyEvent(event); 841 } 842 return false; 843 } 844 845 /** 846 * {@inheritDoc} 847 */ 848 @Override 849 public boolean dispatchKeyShortcutEvent(KeyEvent event) { 850 if ((mPrivateFlags & (FOCUSED | HAS_BOUNDS)) == (FOCUSED | HAS_BOUNDS)) { 851 return super.dispatchKeyShortcutEvent(event); 852 } else if (mFocused != null && (mFocused.mPrivateFlags & HAS_BOUNDS) == HAS_BOUNDS) { 853 return mFocused.dispatchKeyShortcutEvent(event); 854 } 855 return false; 856 } 857 858 /** 859 * {@inheritDoc} 860 */ 861 @Override 862 public boolean dispatchTrackballEvent(MotionEvent event) { 863 if ((mPrivateFlags & (FOCUSED | HAS_BOUNDS)) == (FOCUSED | HAS_BOUNDS)) { 864 return super.dispatchTrackballEvent(event); 865 } else if (mFocused != null && (mFocused.mPrivateFlags & HAS_BOUNDS) == HAS_BOUNDS) { 866 return mFocused.dispatchTrackballEvent(event); 867 } 868 return false; 869 } 870 871 /** 872 * {@inheritDoc} 873 */ 874 @Override 875 public boolean dispatchTouchEvent(MotionEvent ev) { 876 if (!onFilterTouchEventForSecurity(ev)) { 877 return false; 878 } 879 880 if ((mGroupFlags & FLAG_SPLIT_MOTION_EVENTS) == FLAG_SPLIT_MOTION_EVENTS) { 881 if (mSplitMotionTargets == null) { 882 mSplitMotionTargets = new SplitMotionTargets(); 883 } 884 return dispatchSplitTouchEvent(ev); 885 } 886 887 final int action = ev.getAction(); 888 final float xf = ev.getX(); 889 final float yf = ev.getY(); 890 final float scrolledXFloat = xf + mScrollX; 891 final float scrolledYFloat = yf + mScrollY; 892 893 boolean disallowIntercept = (mGroupFlags & FLAG_DISALLOW_INTERCEPT) != 0; 894 895 if (action == MotionEvent.ACTION_DOWN) { 896 if (mMotionTarget != null) { 897 // this is weird, we got a pen down, but we thought it was 898 // already down! 899 // XXX: We should probably send an ACTION_UP to the current 900 // target. 901 mMotionTarget = null; 902 } 903 // If we're disallowing intercept or if we're allowing and we didn't 904 // intercept 905 if (disallowIntercept || !onInterceptTouchEvent(ev)) { 906 // reset this event's action (just to protect ourselves) 907 ev.setAction(MotionEvent.ACTION_DOWN); 908 // We know we want to dispatch the event down, find a child 909 // who can handle it, start with the front-most child. 910 final View[] children = mChildren; 911 final int count = mChildrenCount; 912 913 // Check for children with overlays first. They don't rely on hit rects to determine 914 // if they can accept a new touch event. 915 if ((mGroupFlags & FLAG_CHILD_HAS_OVERLAY) == FLAG_CHILD_HAS_OVERLAY) { 916 for (int i = count - 1; i >= 0; i--) { 917 final View child = children[i]; 918 // Don't let children respond to events as an overlay during an animation. 919 if ((child.mViewFlags & VISIBILITY_MASK) == VISIBLE 920 && child.getAnimation() == null 921 && child.isOverlayEnabled()) { 922 // offset the event to the view's coordinate system 923 final float xc = scrolledXFloat - child.mLeft; 924 final float yc = scrolledYFloat - child.mTop; 925 ev.setLocation(xc, yc); 926 child.mPrivateFlags &= ~CANCEL_NEXT_UP_EVENT; 927 if (child.dispatchTouchEvent(ev)) { 928 // Event handled, we have a target now. 929 mMotionTarget = child; 930 return true; 931 } 932 // The event didn't get handled, try the next view. 933 // Don't reset the event's location, it's not 934 // necessary here. 935 } 936 } 937 } 938 939 // Now check views normally. 940 for (int i = count - 1; i >= 0; i--) { 941 final View child = children[i]; 942 if ((child.mViewFlags & VISIBILITY_MASK) == VISIBLE 943 || child.getAnimation() != null) { 944 // Single dispatch always picks its target based on the initial down 945 // event's position - index 0 946 if (dispatchTouchEventIfInView(child, ev, 0)) { 947 mMotionTarget = child; 948 return true; 949 } 950 } 951 } 952 } 953 } 954 955 boolean isUpOrCancel = (action == MotionEvent.ACTION_UP) || 956 (action == MotionEvent.ACTION_CANCEL); 957 958 if (isUpOrCancel) { 959 // Note, we've already copied the previous state to our local 960 // variable, so this takes effect on the next event 961 mGroupFlags &= ~FLAG_DISALLOW_INTERCEPT; 962 } 963 964 // The event wasn't an ACTION_DOWN, dispatch it to our target if 965 // we have one. 966 final View target = mMotionTarget; 967 if (target == null) { 968 // We don't have a target, this means we're handling the 969 // event as a regular view. 970 ev.setLocation(xf, yf); 971 if ((mPrivateFlags & CANCEL_NEXT_UP_EVENT) != 0) { 972 ev.setAction(MotionEvent.ACTION_CANCEL); 973 mPrivateFlags &= ~CANCEL_NEXT_UP_EVENT; 974 } 975 return super.dispatchTouchEvent(ev); 976 } 977 978 // Calculate the offset point into the target's local coordinates 979 float xc = scrolledXFloat - (float) target.mLeft; 980 float yc = scrolledYFloat - (float) target.mTop; 981 if (!target.hasIdentityMatrix() && mAttachInfo != null) { 982 // non-identity matrix: transform the point into the view's coordinates 983 final float[] localXY = mAttachInfo.mTmpTransformLocation; 984 localXY[0] = xc; 985 localXY[1] = yc; 986 target.getInverseMatrix().mapPoints(localXY); 987 xc = localXY[0]; 988 yc = localXY[1]; 989 } 990 991 // if have a target, see if we're allowed to and want to intercept its 992 // events 993 if (!disallowIntercept && onInterceptTouchEvent(ev)) { 994 mPrivateFlags &= ~CANCEL_NEXT_UP_EVENT; 995 ev.setAction(MotionEvent.ACTION_CANCEL); 996 ev.setLocation(xc, yc); 997 if (!target.dispatchTouchEvent(ev)) { 998 // target didn't handle ACTION_CANCEL. not much we can do 999 // but they should have. 1000 } 1001 // clear the target 1002 mMotionTarget = null; 1003 // Don't dispatch this event to our own view, because we already 1004 // saw it when intercepting; we just want to give the following 1005 // event to the normal onTouchEvent(). 1006 return true; 1007 } 1008 1009 if (isUpOrCancel) { 1010 mMotionTarget = null; 1011 } 1012 1013 // finally offset the event to the target's coordinate system and 1014 // dispatch the event. 1015 ev.setLocation(xc, yc); 1016 1017 if ((target.mPrivateFlags & CANCEL_NEXT_UP_EVENT) != 0) { 1018 ev.setAction(MotionEvent.ACTION_CANCEL); 1019 target.mPrivateFlags &= ~CANCEL_NEXT_UP_EVENT; 1020 mMotionTarget = null; 1021 } 1022 1023 if (target.dispatchTouchEvent(ev)) { 1024 return true; 1025 } else { 1026 ev.setLocation(xf, yf); 1027 } 1028 return false; 1029 } 1030 1031 /** 1032 * This method detects whether the pointer location at <code>pointerIndex</code> within 1033 * <code>ev</code> is inside the specified view. If so, the transformed event is dispatched to 1034 * <code>child</code>. 1035 * 1036 * @param child View to hit test against 1037 * @param ev MotionEvent to test 1038 * @param pointerIndex Index of the pointer within <code>ev</code> to test 1039 * @return <code>false</code> if the hit test failed, or the result of 1040 * <code>child.dispatchTouchEvent</code> 1041 */ 1042 private boolean dispatchTouchEventIfInView(View child, MotionEvent ev, int pointerIndex) { 1043 final float x = ev.getX(pointerIndex); 1044 final float y = ev.getY(pointerIndex); 1045 final float scrolledX = x + mScrollX; 1046 final float scrolledY = y + mScrollY; 1047 float localX = scrolledX - child.mLeft; 1048 float localY = scrolledY - child.mTop; 1049 if (!child.hasIdentityMatrix() && mAttachInfo != null) { 1050 // non-identity matrix: transform the point into the view's coordinates 1051 final float[] localXY = mAttachInfo.mTmpTransformLocation; 1052 localXY[0] = localX; 1053 localXY[1] = localY; 1054 child.getInverseMatrix().mapPoints(localXY); 1055 localX = localXY[0]; 1056 localY = localXY[1]; 1057 } 1058 if (localX >= 0 && localY >= 0 && localX < (child.mRight - child.mLeft) && 1059 localY < (child.mBottom - child.mTop)) { 1060 // It would be safer to clone the event here but we don't for performance. 1061 // There are many subtle interactions in touch event dispatch; change at your own risk. 1062 child.mPrivateFlags &= ~CANCEL_NEXT_UP_EVENT; 1063 ev.offsetLocation(localX - x, localY - y); 1064 if (child.dispatchTouchEvent(ev)) { 1065 return true; 1066 } else { 1067 ev.offsetLocation(x - localX, y - localY); 1068 return false; 1069 } 1070 } 1071 return false; 1072 } 1073 1074 private boolean dispatchSplitTouchEvent(MotionEvent ev) { 1075 final SplitMotionTargets targets = mSplitMotionTargets; 1076 final int action = ev.getAction(); 1077 final int maskedAction = ev.getActionMasked(); 1078 float xf = ev.getX(); 1079 float yf = ev.getY(); 1080 float scrolledXFloat = xf + mScrollX; 1081 float scrolledYFloat = yf + mScrollY; 1082 1083 boolean disallowIntercept = (mGroupFlags & FLAG_DISALLOW_INTERCEPT) != 0; 1084 1085 if (maskedAction == MotionEvent.ACTION_DOWN || 1086 maskedAction == MotionEvent.ACTION_POINTER_DOWN) { 1087 final int actionIndex = ev.getActionIndex(); 1088 final int actionId = ev.getPointerId(actionIndex); 1089 1090 // Clear out any current target for this ID. 1091 // XXX: We should probably send an ACTION_UP to the current 1092 // target if present. 1093 targets.removeById(actionId); 1094 1095 // If we're disallowing intercept or if we're allowing and we didn't 1096 // intercept 1097 if (disallowIntercept || !onInterceptTouchEvent(ev)) { 1098 // reset this event's action (just to protect ourselves) 1099 ev.setAction(action); 1100 // We know we want to dispatch the event down, try to find a child 1101 // who can handle it, start with the front-most child. 1102 final long downTime = ev.getEventTime(); 1103 final View[] children = mChildren; 1104 final int count = mChildrenCount; 1105 for (int i = count - 1; i >= 0; i--) { 1106 final View child = children[i]; 1107 if ((child.mViewFlags & VISIBILITY_MASK) == VISIBLE 1108 || child.getAnimation() != null) { 1109 final MotionEvent childEvent = 1110 targets.filterMotionEventForChild(ev, child, downTime); 1111 if (childEvent != null) { 1112 try { 1113 final int childActionIndex = childEvent.findPointerIndex(actionId); 1114 if (dispatchTouchEventIfInView(child, childEvent, 1115 childActionIndex)) { 1116 targets.add(actionId, child, downTime); 1117 1118 return true; 1119 } 1120 } finally { 1121 childEvent.recycle(); 1122 } 1123 } 1124 } 1125 } 1126 1127 // Didn't find a new target. Do we have a "primary" target to send to? 1128 final SplitMotionTargets.TargetInfo primaryTargetInfo = targets.getPrimaryTarget(); 1129 if (primaryTargetInfo != null) { 1130 final View primaryTarget = primaryTargetInfo.view; 1131 final MotionEvent childEvent = targets.filterMotionEventForChild(ev, 1132 primaryTarget, primaryTargetInfo.downTime); 1133 if (childEvent != null) { 1134 try { 1135 // Calculate the offset point into the target's local coordinates 1136 float xc = scrolledXFloat - (float) primaryTarget.mLeft; 1137 float yc = scrolledYFloat - (float) primaryTarget.mTop; 1138 if (!primaryTarget.hasIdentityMatrix() && mAttachInfo != null) { 1139 // non-identity matrix: transform the point into the view's 1140 // coordinates 1141 final float[] localXY = mAttachInfo.mTmpTransformLocation; 1142 localXY[0] = xc; 1143 localXY[1] = yc; 1144 primaryTarget.getInverseMatrix().mapPoints(localXY); 1145 xc = localXY[0]; 1146 yc = localXY[1]; 1147 } 1148 childEvent.setLocation(xc, yc); 1149 if (primaryTarget.dispatchTouchEvent(childEvent)) { 1150 targets.add(actionId, primaryTarget, primaryTargetInfo.downTime); 1151 return true; 1152 } 1153 } finally { 1154 childEvent.recycle(); 1155 } 1156 } 1157 } 1158 } 1159 } 1160 1161 boolean isUpOrCancel = (action == MotionEvent.ACTION_UP) || 1162 (action == MotionEvent.ACTION_CANCEL); 1163 1164 if (isUpOrCancel) { 1165 // Note, we've already copied the previous state to our local 1166 // variable, so this takes effect on the next event 1167 mGroupFlags &= ~FLAG_DISALLOW_INTERCEPT; 1168 } 1169 1170 if (targets.isEmpty()) { 1171 // We don't have any targets, this means we're handling the 1172 // event as a regular view. 1173 ev.setLocation(xf, yf); 1174 if ((mPrivateFlags & CANCEL_NEXT_UP_EVENT) != 0) { 1175 ev.setAction(MotionEvent.ACTION_CANCEL); 1176 mPrivateFlags &= ~CANCEL_NEXT_UP_EVENT; 1177 } 1178 return super.dispatchTouchEvent(ev); 1179 } 1180 1181 // if we have targets, see if we're allowed to and want to intercept their 1182 // events 1183 int uniqueTargetCount = targets.getUniqueTargetCount(); 1184 if (!disallowIntercept && onInterceptTouchEvent(ev)) { 1185 mPrivateFlags &= ~CANCEL_NEXT_UP_EVENT; 1186 1187 for (int uniqueIndex = 0; uniqueIndex < uniqueTargetCount; uniqueIndex++) { 1188 final View target = targets.getUniqueTargetAt(uniqueIndex).view; 1189 1190 // Calculate the offset point into the target's local coordinates 1191 float xc = scrolledXFloat - (float) target.mLeft; 1192 float yc = scrolledYFloat - (float) target.mTop; 1193 if (!target.hasIdentityMatrix() && mAttachInfo != null) { 1194 // non-identity matrix: transform the point into the view's coordinates 1195 final float[] localXY = mAttachInfo.mTmpTransformLocation; 1196 localXY[0] = xc; 1197 localXY[1] = yc; 1198 target.getInverseMatrix().mapPoints(localXY); 1199 xc = localXY[0]; 1200 yc = localXY[1]; 1201 } 1202 1203 ev.setAction(MotionEvent.ACTION_CANCEL); 1204 ev.setLocation(xc, yc); 1205 if (!target.dispatchTouchEvent(ev)) { 1206 // target didn't handle ACTION_CANCEL. not much we can do 1207 // but they should have. 1208 } 1209 } 1210 targets.clear(); 1211 // Don't dispatch this event to our own view, because we already 1212 // saw it when intercepting; we just want to give the following 1213 // event to the normal onTouchEvent(). 1214 return true; 1215 } 1216 1217 boolean handled = false; 1218 for (int uniqueIndex = 0; uniqueIndex < uniqueTargetCount; uniqueIndex++) { 1219 final SplitMotionTargets.TargetInfo targetInfo = targets.getUniqueTargetAt(uniqueIndex); 1220 final View target = targetInfo.view; 1221 1222 final MotionEvent targetEvent = 1223 targets.filterMotionEventForChild(ev, target, targetInfo.downTime); 1224 if (targetEvent == null) { 1225 continue; 1226 } 1227 1228 try { 1229 // Calculate the offset point into the target's local coordinates 1230 xf = targetEvent.getX(); 1231 yf = targetEvent.getY(); 1232 scrolledXFloat = xf + mScrollX; 1233 scrolledYFloat = yf + mScrollY; 1234 float xc = scrolledXFloat - (float) target.mLeft; 1235 float yc = scrolledYFloat - (float) target.mTop; 1236 if (!target.hasIdentityMatrix() && mAttachInfo != null) { 1237 // non-identity matrix: transform the point into the view's coordinates 1238 final float[] localXY = mAttachInfo.mTmpTransformLocation; 1239 localXY[0] = xc; 1240 localXY[1] = yc; 1241 target.getInverseMatrix().mapPoints(localXY); 1242 xc = localXY[0]; 1243 yc = localXY[1]; 1244 } 1245 1246 // finally offset the event to the target's coordinate system and 1247 // dispatch the event. 1248 targetEvent.setLocation(xc, yc); 1249 1250 if ((target.mPrivateFlags & CANCEL_NEXT_UP_EVENT) != 0) { 1251 targetEvent.setAction(MotionEvent.ACTION_CANCEL); 1252 target.mPrivateFlags &= ~CANCEL_NEXT_UP_EVENT; 1253 targets.removeView(target); 1254 uniqueIndex--; 1255 uniqueTargetCount--; 1256 } 1257 1258 handled |= target.dispatchTouchEvent(targetEvent); 1259 } finally { 1260 targetEvent.recycle(); 1261 } 1262 } 1263 1264 if (maskedAction == MotionEvent.ACTION_POINTER_UP) { 1265 final int removeId = ev.getPointerId(ev.getActionIndex()); 1266 targets.removeById(removeId); 1267 } 1268 1269 if (isUpOrCancel) { 1270 targets.clear(); 1271 } 1272 1273 return handled; 1274 } 1275 1276 /** 1277 * Enable or disable the splitting of MotionEvents to multiple children during touch event 1278 * dispatch. This behavior is disabled by default. 1279 * 1280 * <p>When this option is enabled MotionEvents may be split and dispatched to different child 1281 * views depending on where each pointer initially went down. This allows for user interactions 1282 * such as scrolling two panes of content independently, chording of buttons, and performing 1283 * independent gestures on different pieces of content. 1284 * 1285 * @param split <code>true</code> to allow MotionEvents to be split and dispatched to multiple 1286 * child views. <code>false</code> to only allow one child view to be the target of 1287 * any MotionEvent received by this ViewGroup. 1288 */ 1289 public void setMotionEventSplittingEnabled(boolean split) { 1290 // TODO Applications really shouldn't change this setting mid-touch event, 1291 // but perhaps this should handle that case and send ACTION_CANCELs to any child views 1292 // with gestures in progress when this is changed. 1293 if (split) { 1294 mGroupFlags |= FLAG_SPLIT_MOTION_EVENTS; 1295 } else { 1296 mGroupFlags &= ~FLAG_SPLIT_MOTION_EVENTS; 1297 mSplitMotionTargets = null; 1298 } 1299 } 1300 1301 /** 1302 * @return true if MotionEvents dispatched to this ViewGroup can be split to multiple children. 1303 */ 1304 public boolean isMotionEventSplittingEnabled() { 1305 return (mGroupFlags & FLAG_SPLIT_MOTION_EVENTS) == FLAG_SPLIT_MOTION_EVENTS; 1306 } 1307 1308 /** 1309 * {@inheritDoc} 1310 */ 1311 public void requestDisallowInterceptTouchEvent(boolean disallowIntercept) { 1312 1313 if (disallowIntercept == ((mGroupFlags & FLAG_DISALLOW_INTERCEPT) != 0)) { 1314 // We're already in this state, assume our ancestors are too 1315 return; 1316 } 1317 1318 if (disallowIntercept) { 1319 mGroupFlags |= FLAG_DISALLOW_INTERCEPT; 1320 } else { 1321 mGroupFlags &= ~FLAG_DISALLOW_INTERCEPT; 1322 } 1323 1324 // Pass it up to our parent 1325 if (mParent != null) { 1326 mParent.requestDisallowInterceptTouchEvent(disallowIntercept); 1327 } 1328 } 1329 1330 /** 1331 * Implement this method to intercept all touch screen motion events. This 1332 * allows you to watch events as they are dispatched to your children, and 1333 * take ownership of the current gesture at any point. 1334 * 1335 * <p>Using this function takes some care, as it has a fairly complicated 1336 * interaction with {@link View#onTouchEvent(MotionEvent) 1337 * View.onTouchEvent(MotionEvent)}, and using it requires implementing 1338 * that method as well as this one in the correct way. Events will be 1339 * received in the following order: 1340 * 1341 * <ol> 1342 * <li> You will receive the down event here. 1343 * <li> The down event will be handled either by a child of this view 1344 * group, or given to your own onTouchEvent() method to handle; this means 1345 * you should implement onTouchEvent() to return true, so you will 1346 * continue to see the rest of the gesture (instead of looking for 1347 * a parent view to handle it). Also, by returning true from 1348 * onTouchEvent(), you will not receive any following 1349 * events in onInterceptTouchEvent() and all touch processing must 1350 * happen in onTouchEvent() like normal. 1351 * <li> For as long as you return false from this function, each following 1352 * event (up to and including the final up) will be delivered first here 1353 * and then to the target's onTouchEvent(). 1354 * <li> If you return true from here, you will not receive any 1355 * following events: the target view will receive the same event but 1356 * with the action {@link MotionEvent#ACTION_CANCEL}, and all further 1357 * events will be delivered to your onTouchEvent() method and no longer 1358 * appear here. 1359 * </ol> 1360 * 1361 * @param ev The motion event being dispatched down the hierarchy. 1362 * @return Return true to steal motion events from the children and have 1363 * them dispatched to this ViewGroup through onTouchEvent(). 1364 * The current target will receive an ACTION_CANCEL event, and no further 1365 * messages will be delivered here. 1366 */ 1367 public boolean onInterceptTouchEvent(MotionEvent ev) { 1368 return false; 1369 } 1370 1371 /** 1372 * {@inheritDoc} 1373 * 1374 * Looks for a view to give focus to respecting the setting specified by 1375 * {@link #getDescendantFocusability()}. 1376 * 1377 * Uses {@link #onRequestFocusInDescendants(int, android.graphics.Rect)} to 1378 * find focus within the children of this group when appropriate. 1379 * 1380 * @see #FOCUS_BEFORE_DESCENDANTS 1381 * @see #FOCUS_AFTER_DESCENDANTS 1382 * @see #FOCUS_BLOCK_DESCENDANTS 1383 * @see #onRequestFocusInDescendants 1384 */ 1385 @Override 1386 public boolean requestFocus(int direction, Rect previouslyFocusedRect) { 1387 if (DBG) { 1388 System.out.println(this + " ViewGroup.requestFocus direction=" 1389 + direction); 1390 } 1391 int descendantFocusability = getDescendantFocusability(); 1392 1393 switch (descendantFocusability) { 1394 case FOCUS_BLOCK_DESCENDANTS: 1395 return super.requestFocus(direction, previouslyFocusedRect); 1396 case FOCUS_BEFORE_DESCENDANTS: { 1397 final boolean took = super.requestFocus(direction, previouslyFocusedRect); 1398 return took ? took : onRequestFocusInDescendants(direction, previouslyFocusedRect); 1399 } 1400 case FOCUS_AFTER_DESCENDANTS: { 1401 final boolean took = onRequestFocusInDescendants(direction, previouslyFocusedRect); 1402 return took ? took : super.requestFocus(direction, previouslyFocusedRect); 1403 } 1404 default: 1405 throw new IllegalStateException("descendant focusability must be " 1406 + "one of FOCUS_BEFORE_DESCENDANTS, FOCUS_AFTER_DESCENDANTS, FOCUS_BLOCK_DESCENDANTS " 1407 + "but is " + descendantFocusability); 1408 } 1409 } 1410 1411 /** 1412 * Look for a descendant to call {@link View#requestFocus} on. 1413 * Called by {@link ViewGroup#requestFocus(int, android.graphics.Rect)} 1414 * when it wants to request focus within its children. Override this to 1415 * customize how your {@link ViewGroup} requests focus within its children. 1416 * @param direction One of FOCUS_UP, FOCUS_DOWN, FOCUS_LEFT, and FOCUS_RIGHT 1417 * @param previouslyFocusedRect The rectangle (in this View's coordinate system) 1418 * to give a finer grained hint about where focus is coming from. May be null 1419 * if there is no hint. 1420 * @return Whether focus was taken. 1421 */ 1422 @SuppressWarnings({"ConstantConditions"}) 1423 protected boolean onRequestFocusInDescendants(int direction, 1424 Rect previouslyFocusedRect) { 1425 int index; 1426 int increment; 1427 int end; 1428 int count = mChildrenCount; 1429 if ((direction & FOCUS_FORWARD) != 0) { 1430 index = 0; 1431 increment = 1; 1432 end = count; 1433 } else { 1434 index = count - 1; 1435 increment = -1; 1436 end = -1; 1437 } 1438 final View[] children = mChildren; 1439 for (int i = index; i != end; i += increment) { 1440 View child = children[i]; 1441 if ((child.mViewFlags & VISIBILITY_MASK) == VISIBLE) { 1442 if (child.requestFocus(direction, previouslyFocusedRect)) { 1443 return true; 1444 } 1445 } 1446 } 1447 return false; 1448 } 1449 1450 /** 1451 * {@inheritDoc} 1452 * 1453 * @hide 1454 */ 1455 @Override 1456 public void dispatchStartTemporaryDetach() { 1457 super.dispatchStartTemporaryDetach(); 1458 final int count = mChildrenCount; 1459 final View[] children = mChildren; 1460 for (int i = 0; i < count; i++) { 1461 children[i].dispatchStartTemporaryDetach(); 1462 } 1463 } 1464 1465 /** 1466 * {@inheritDoc} 1467 * 1468 * @hide 1469 */ 1470 @Override 1471 public void dispatchFinishTemporaryDetach() { 1472 super.dispatchFinishTemporaryDetach(); 1473 final int count = mChildrenCount; 1474 final View[] children = mChildren; 1475 for (int i = 0; i < count; i++) { 1476 children[i].dispatchFinishTemporaryDetach(); 1477 } 1478 } 1479 1480 /** 1481 * {@inheritDoc} 1482 */ 1483 @Override 1484 void dispatchAttachedToWindow(AttachInfo info, int visibility) { 1485 super.dispatchAttachedToWindow(info, visibility); 1486 visibility |= mViewFlags & VISIBILITY_MASK; 1487 final int count = mChildrenCount; 1488 final View[] children = mChildren; 1489 for (int i = 0; i < count; i++) { 1490 children[i].dispatchAttachedToWindow(info, visibility); 1491 } 1492 } 1493 1494 @Override 1495 public boolean dispatchPopulateAccessibilityEvent(AccessibilityEvent event) { 1496 boolean populated = false; 1497 for (int i = 0, count = getChildCount(); i < count; i++) { 1498 populated |= getChildAt(i).dispatchPopulateAccessibilityEvent(event); 1499 } 1500 return populated; 1501 } 1502 1503 /** 1504 * {@inheritDoc} 1505 */ 1506 @Override 1507 void dispatchDetachedFromWindow() { 1508 // If we still have a motion target, we are still in the process of 1509 // dispatching motion events to a child; we need to get rid of that 1510 // child to avoid dispatching events to it after the window is torn 1511 // down. To make sure we keep the child in a consistent state, we 1512 // first send it an ACTION_CANCEL motion event. 1513 if (mMotionTarget != null) { 1514 final long now = SystemClock.uptimeMillis(); 1515 final MotionEvent event = MotionEvent.obtain(now, now, 1516 MotionEvent.ACTION_CANCEL, 0.0f, 0.0f, 0); 1517 mMotionTarget.dispatchTouchEvent(event); 1518 event.recycle(); 1519 mMotionTarget = null; 1520 } 1521 1522 final int count = mChildrenCount; 1523 final View[] children = mChildren; 1524 for (int i = 0; i < count; i++) { 1525 children[i].dispatchDetachedFromWindow(); 1526 } 1527 super.dispatchDetachedFromWindow(); 1528 } 1529 1530 /** 1531 * {@inheritDoc} 1532 */ 1533 @Override 1534 public void setPadding(int left, int top, int right, int bottom) { 1535 super.setPadding(left, top, right, bottom); 1536 1537 if ((mPaddingLeft | mPaddingTop | mPaddingRight | mPaddingRight) != 0) { 1538 mGroupFlags |= FLAG_PADDING_NOT_NULL; 1539 } else { 1540 mGroupFlags &= ~FLAG_PADDING_NOT_NULL; 1541 } 1542 } 1543 1544 /** 1545 * {@inheritDoc} 1546 */ 1547 @Override 1548 protected void dispatchSaveInstanceState(SparseArray<Parcelable> container) { 1549 super.dispatchSaveInstanceState(container); 1550 final int count = mChildrenCount; 1551 final View[] children = mChildren; 1552 for (int i = 0; i < count; i++) { 1553 View c = children[i]; 1554 if ((c.mViewFlags & PARENT_SAVE_DISABLED_MASK) != PARENT_SAVE_DISABLED) { 1555 c.dispatchSaveInstanceState(container); 1556 } 1557 } 1558 } 1559 1560 /** 1561 * Perform dispatching of a {@link #saveHierarchyState freeze()} to only this view, 1562 * not to its children. For use when overriding 1563 * {@link #dispatchSaveInstanceState dispatchFreeze()} to allow subclasses to freeze 1564 * their own state but not the state of their children. 1565 * 1566 * @param container the container 1567 */ 1568 protected void dispatchFreezeSelfOnly(SparseArray<Parcelable> container) { 1569 super.dispatchSaveInstanceState(container); 1570 } 1571 1572 /** 1573 * {@inheritDoc} 1574 */ 1575 @Override 1576 protected void dispatchRestoreInstanceState(SparseArray<Parcelable> container) { 1577 super.dispatchRestoreInstanceState(container); 1578 final int count = mChildrenCount; 1579 final View[] children = mChildren; 1580 for (int i = 0; i < count; i++) { 1581 View c = children[i]; 1582 if ((c.mViewFlags & PARENT_SAVE_DISABLED_MASK) != PARENT_SAVE_DISABLED) { 1583 c.dispatchRestoreInstanceState(container); 1584 } 1585 } 1586 } 1587 1588 /** 1589 * Perform dispatching of a {@link #restoreHierarchyState thaw()} to only this view, 1590 * not to its children. For use when overriding 1591 * {@link #dispatchRestoreInstanceState dispatchThaw()} to allow subclasses to thaw 1592 * their own state but not the state of their children. 1593 * 1594 * @param container the container 1595 */ 1596 protected void dispatchThawSelfOnly(SparseArray<Parcelable> container) { 1597 super.dispatchRestoreInstanceState(container); 1598 } 1599 1600 /** 1601 * Enables or disables the drawing cache for each child of this view group. 1602 * 1603 * @param enabled true to enable the cache, false to dispose of it 1604 */ 1605 protected void setChildrenDrawingCacheEnabled(boolean enabled) { 1606 if (enabled || (mPersistentDrawingCache & PERSISTENT_ALL_CACHES) != PERSISTENT_ALL_CACHES) { 1607 final View[] children = mChildren; 1608 final int count = mChildrenCount; 1609 for (int i = 0; i < count; i++) { 1610 children[i].setDrawingCacheEnabled(enabled); 1611 } 1612 } 1613 } 1614 1615 @Override 1616 protected void onAnimationStart() { 1617 super.onAnimationStart(); 1618 1619 // When this ViewGroup's animation starts, build the cache for the children 1620 if ((mGroupFlags & FLAG_ANIMATION_CACHE) == FLAG_ANIMATION_CACHE) { 1621 final int count = mChildrenCount; 1622 final View[] children = mChildren; 1623 1624 for (int i = 0; i < count; i++) { 1625 final View child = children[i]; 1626 if ((child.mViewFlags & VISIBILITY_MASK) == VISIBLE) { 1627 child.setDrawingCacheEnabled(true); 1628 child.buildDrawingCache(true); 1629 } 1630 } 1631 1632 mGroupFlags |= FLAG_CHILDREN_DRAWN_WITH_CACHE; 1633 } 1634 } 1635 1636 @Override 1637 protected void onAnimationEnd() { 1638 super.onAnimationEnd(); 1639 1640 // When this ViewGroup's animation ends, destroy the cache of the children 1641 if ((mGroupFlags & FLAG_ANIMATION_CACHE) == FLAG_ANIMATION_CACHE) { 1642 mGroupFlags &= ~FLAG_CHILDREN_DRAWN_WITH_CACHE; 1643 1644 if ((mPersistentDrawingCache & PERSISTENT_ANIMATION_CACHE) == 0) { 1645 setChildrenDrawingCacheEnabled(false); 1646 } 1647 } 1648 } 1649 1650 @Override 1651 Bitmap createSnapshot(Bitmap.Config quality, int backgroundColor, boolean skipChildren) { 1652 int count = mChildrenCount; 1653 int[] visibilities = null; 1654 1655 if (skipChildren) { 1656 visibilities = new int[count]; 1657 for (int i = 0; i < count; i++) { 1658 View child = getChildAt(i); 1659 visibilities[i] = child.getVisibility(); 1660 if (visibilities[i] == View.VISIBLE) { 1661 child.setVisibility(INVISIBLE); 1662 } 1663 } 1664 } 1665 1666 Bitmap b = super.createSnapshot(quality, backgroundColor, skipChildren); 1667 1668 if (skipChildren) { 1669 for (int i = 0; i < count; i++) { 1670 getChildAt(i).setVisibility(visibilities[i]); 1671 } 1672 } 1673 1674 return b; 1675 } 1676 1677 /** 1678 * {@inheritDoc} 1679 */ 1680 @Override 1681 protected void dispatchDraw(Canvas canvas) { 1682 final int count = mChildrenCount; 1683 final View[] children = mChildren; 1684 int flags = mGroupFlags; 1685 1686 if ((flags & FLAG_RUN_ANIMATION) != 0 && canAnimate()) { 1687 final boolean cache = (mGroupFlags & FLAG_ANIMATION_CACHE) == FLAG_ANIMATION_CACHE; 1688 1689 for (int i = 0; i < count; i++) { 1690 final View child = children[i]; 1691 if ((child.mViewFlags & VISIBILITY_MASK) == VISIBLE) { 1692 final LayoutParams params = child.getLayoutParams(); 1693 attachLayoutAnimationParameters(child, params, i, count); 1694 bindLayoutAnimation(child); 1695 if (cache) { 1696 child.setDrawingCacheEnabled(true); 1697 child.buildDrawingCache(true); 1698 } 1699 } 1700 } 1701 1702 final LayoutAnimationController controller = mLayoutAnimationController; 1703 if (controller.willOverlap()) { 1704 mGroupFlags |= FLAG_OPTIMIZE_INVALIDATE; 1705 } 1706 1707 controller.start(); 1708 1709 mGroupFlags &= ~FLAG_RUN_ANIMATION; 1710 mGroupFlags &= ~FLAG_ANIMATION_DONE; 1711 1712 if (cache) { 1713 mGroupFlags |= FLAG_CHILDREN_DRAWN_WITH_CACHE; 1714 } 1715 1716 if (mAnimationListener != null) { 1717 mAnimationListener.onAnimationStart(controller.getAnimation()); 1718 } 1719 } 1720 1721 int saveCount = 0; 1722 final boolean clipToPadding = (flags & CLIP_TO_PADDING_MASK) == CLIP_TO_PADDING_MASK; 1723 if (clipToPadding) { 1724 saveCount = canvas.save(); 1725 canvas.clipRect(mScrollX + mPaddingLeft, mScrollY + mPaddingTop, 1726 mScrollX + mRight - mLeft - mPaddingRight, 1727 mScrollY + mBottom - mTop - mPaddingBottom); 1728 1729 } 1730 1731 // We will draw our child's animation, let's reset the flag 1732 mPrivateFlags &= ~DRAW_ANIMATION; 1733 mGroupFlags &= ~FLAG_INVALIDATE_REQUIRED; 1734 1735 boolean more = false; 1736 final long drawingTime = getDrawingTime(); 1737 1738 if ((flags & FLAG_USE_CHILD_DRAWING_ORDER) == 0) { 1739 for (int i = 0; i < count; i++) { 1740 final View child = children[i]; 1741 if ((child.mViewFlags & VISIBILITY_MASK) == VISIBLE || child.getAnimation() != null) { 1742 more |= drawChild(canvas, child, drawingTime); 1743 } 1744 } 1745 } else { 1746 for (int i = 0; i < count; i++) { 1747 final View child = children[getChildDrawingOrder(count, i)]; 1748 if ((child.mViewFlags & VISIBILITY_MASK) == VISIBLE || child.getAnimation() != null) { 1749 more |= drawChild(canvas, child, drawingTime); 1750 } 1751 } 1752 } 1753 1754 // Draw any disappearing views that have animations 1755 if (mDisappearingChildren != null) { 1756 final ArrayList<View> disappearingChildren = mDisappearingChildren; 1757 final int disappearingCount = disappearingChildren.size() - 1; 1758 // Go backwards -- we may delete as animations finish 1759 for (int i = disappearingCount; i >= 0; i--) { 1760 final View child = disappearingChildren.get(i); 1761 more |= drawChild(canvas, child, drawingTime); 1762 } 1763 } 1764 1765 if (clipToPadding) { 1766 canvas.restoreToCount(saveCount); 1767 } 1768 1769 // mGroupFlags might have been updated by drawChild() 1770 flags = mGroupFlags; 1771 1772 if ((flags & FLAG_INVALIDATE_REQUIRED) == FLAG_INVALIDATE_REQUIRED) { 1773 invalidate(); 1774 } 1775 1776 if ((flags & FLAG_ANIMATION_DONE) == 0 && (flags & FLAG_NOTIFY_ANIMATION_LISTENER) == 0 && 1777 mLayoutAnimationController.isDone() && !more) { 1778 // We want to erase the drawing cache and notify the listener after the 1779 // next frame is drawn because one extra invalidate() is caused by 1780 // drawChild() after the animation is over 1781 mGroupFlags |= FLAG_NOTIFY_ANIMATION_LISTENER; 1782 final Runnable end = new Runnable() { 1783 public void run() { 1784 notifyAnimationListener(); 1785 } 1786 }; 1787 post(end); 1788 } 1789 } 1790 1791 /** 1792 * Returns the index of the child to draw for this iteration. Override this 1793 * if you want to change the drawing order of children. By default, it 1794 * returns i. 1795 * <p> 1796 * NOTE: In order for this method to be called, you must enable child ordering 1797 * first by calling {@link #setChildrenDrawingOrderEnabled(boolean)}. 1798 * 1799 * @param i The current iteration. 1800 * @return The index of the child to draw this iteration. 1801 * 1802 * @see #setChildrenDrawingOrderEnabled(boolean) 1803 * @see #isChildrenDrawingOrderEnabled() 1804 */ 1805 protected int getChildDrawingOrder(int childCount, int i) { 1806 return i; 1807 } 1808 1809 private void notifyAnimationListener() { 1810 mGroupFlags &= ~FLAG_NOTIFY_ANIMATION_LISTENER; 1811 mGroupFlags |= FLAG_ANIMATION_DONE; 1812 1813 if (mAnimationListener != null) { 1814 final Runnable end = new Runnable() { 1815 public void run() { 1816 mAnimationListener.onAnimationEnd(mLayoutAnimationController.getAnimation()); 1817 } 1818 }; 1819 post(end); 1820 } 1821 1822 if ((mGroupFlags & FLAG_ANIMATION_CACHE) == FLAG_ANIMATION_CACHE) { 1823 mGroupFlags &= ~FLAG_CHILDREN_DRAWN_WITH_CACHE; 1824 if ((mPersistentDrawingCache & PERSISTENT_ANIMATION_CACHE) == 0) { 1825 setChildrenDrawingCacheEnabled(false); 1826 } 1827 } 1828 1829 invalidate(); 1830 } 1831 1832 /** 1833 * Draw one child of this View Group. This method is responsible for getting 1834 * the canvas in the right state. This includes clipping, translating so 1835 * that the child's scrolled origin is at 0, 0, and applying any animation 1836 * transformations. 1837 * 1838 * @param canvas The canvas on which to draw the child 1839 * @param child Who to draw 1840 * @param drawingTime The time at which draw is occuring 1841 * @return True if an invalidate() was issued 1842 */ 1843 protected boolean drawChild(Canvas canvas, View child, long drawingTime) { 1844 boolean more = false; 1845 1846 final int cl = child.mLeft; 1847 final int ct = child.mTop; 1848 final int cr = child.mRight; 1849 final int cb = child.mBottom; 1850 1851 final int flags = mGroupFlags; 1852 1853 if ((flags & FLAG_CLEAR_TRANSFORMATION) == FLAG_CLEAR_TRANSFORMATION) { 1854 mChildTransformation.clear(); 1855 mGroupFlags &= ~FLAG_CLEAR_TRANSFORMATION; 1856 } 1857 1858 Transformation transformToApply = null; 1859 Transformation invalidationTransform; 1860 final Animation a = child.getAnimation(); 1861 boolean concatMatrix = false; 1862 1863 boolean scalingRequired = false; 1864 boolean caching = false; 1865 if (!canvas.isHardwareAccelerated() && 1866 (flags & FLAG_CHILDREN_DRAWN_WITH_CACHE) == FLAG_CHILDREN_DRAWN_WITH_CACHE || 1867 (flags & FLAG_ALWAYS_DRAWN_WITH_CACHE) == FLAG_ALWAYS_DRAWN_WITH_CACHE) { 1868 caching = true; 1869 if (mAttachInfo != null) scalingRequired = mAttachInfo.mScalingRequired; 1870 } 1871 1872 if (a != null) { 1873 final boolean initialized = a.isInitialized(); 1874 if (!initialized) { 1875 a.initialize(cr - cl, cb - ct, getWidth(), getHeight()); 1876 a.initializeInvalidateRegion(0, 0, cr - cl, cb - ct); 1877 child.onAnimationStart(); 1878 } 1879 1880 more = a.getTransformation(drawingTime, mChildTransformation, 1881 scalingRequired ? mAttachInfo.mApplicationScale : 1f); 1882 if (scalingRequired && mAttachInfo.mApplicationScale != 1f) { 1883 if (mInvalidationTransformation == null) { 1884 mInvalidationTransformation = new Transformation(); 1885 } 1886 invalidationTransform = mInvalidationTransformation; 1887 a.getTransformation(drawingTime, invalidationTransform, 1f); 1888 } else { 1889 invalidationTransform = mChildTransformation; 1890 } 1891 transformToApply = mChildTransformation; 1892 1893 concatMatrix = a.willChangeTransformationMatrix(); 1894 1895 if (more) { 1896 if (!a.willChangeBounds()) { 1897 if ((flags & (FLAG_OPTIMIZE_INVALIDATE | FLAG_ANIMATION_DONE)) == 1898 FLAG_OPTIMIZE_INVALIDATE) { 1899 mGroupFlags |= FLAG_INVALIDATE_REQUIRED; 1900 } else if ((flags & FLAG_INVALIDATE_REQUIRED) == 0) { 1901 // The child need to draw an animation, potentially offscreen, so 1902 // make sure we do not cancel invalidate requests 1903 mPrivateFlags |= DRAW_ANIMATION; 1904 invalidate(cl, ct, cr, cb); 1905 } 1906 } else { 1907 if (mInvalidateRegion == null) { 1908 mInvalidateRegion = new RectF(); 1909 } 1910 final RectF region = mInvalidateRegion; 1911 a.getInvalidateRegion(0, 0, cr - cl, cb - ct, region, invalidationTransform); 1912 1913 // The child need to draw an animation, potentially offscreen, so 1914 // make sure we do not cancel invalidate requests 1915 mPrivateFlags |= DRAW_ANIMATION; 1916 1917 final int left = cl + (int) region.left; 1918 final int top = ct + (int) region.top; 1919 invalidate(left, top, left + (int) region.width(), top + (int) region.height()); 1920 } 1921 } 1922 } else if ((flags & FLAG_SUPPORT_STATIC_TRANSFORMATIONS) == 1923 FLAG_SUPPORT_STATIC_TRANSFORMATIONS) { 1924 final boolean hasTransform = getChildStaticTransformation(child, mChildTransformation); 1925 if (hasTransform) { 1926 final int transformType = mChildTransformation.getTransformationType(); 1927 transformToApply = transformType != Transformation.TYPE_IDENTITY ? 1928 mChildTransformation : null; 1929 concatMatrix = (transformType & Transformation.TYPE_MATRIX) != 0; 1930 } 1931 } 1932 1933 concatMatrix |= !child.hasIdentityMatrix(); 1934 1935 // Sets the flag as early as possible to allow draw() implementations 1936 // to call invalidate() successfully when doing animations 1937 child.mPrivateFlags |= DRAWN; 1938 1939 if (!concatMatrix && canvas.quickReject(cl, ct, cr, cb, Canvas.EdgeType.BW) && 1940 (child.mPrivateFlags & DRAW_ANIMATION) == 0) { 1941 return more; 1942 } 1943 1944 child.computeScroll(); 1945 1946 final int sx = child.mScrollX; 1947 final int sy = child.mScrollY; 1948 1949 Bitmap cache = null; 1950 if (caching) { 1951 cache = child.getDrawingCache(true); 1952 } 1953 1954 final boolean hasNoCache = cache == null; 1955 1956 final int restoreTo = canvas.save(); 1957 if (hasNoCache) { 1958 canvas.translate(cl - sx, ct - sy); 1959 } else { 1960 canvas.translate(cl, ct); 1961 if (scalingRequired) { 1962 // mAttachInfo cannot be null, otherwise scalingRequired == false 1963 final float scale = 1.0f / mAttachInfo.mApplicationScale; 1964 canvas.scale(scale, scale); 1965 } 1966 } 1967 1968 float alpha = child.getAlpha(); 1969 1970 if (transformToApply != null || alpha < 1.0f || !child.hasIdentityMatrix()) { 1971 int transX = 0; 1972 int transY = 0; 1973 1974 if (hasNoCache) { 1975 transX = -sx; 1976 transY = -sy; 1977 } 1978 1979 if (transformToApply != null) { 1980 if (concatMatrix) { 1981 // Undo the scroll translation, apply the transformation matrix, 1982 // then redo the scroll translate to get the correct result. 1983 canvas.translate(-transX, -transY); 1984 canvas.concat(transformToApply.getMatrix()); 1985 canvas.translate(transX, transY); 1986 mGroupFlags |= FLAG_CLEAR_TRANSFORMATION; 1987 } 1988 1989 float transformAlpha = transformToApply.getAlpha(); 1990 if (transformAlpha < 1.0f) { 1991 alpha *= transformToApply.getAlpha(); 1992 mGroupFlags |= FLAG_CLEAR_TRANSFORMATION; 1993 } 1994 } 1995 1996 if (!child.hasIdentityMatrix()) { 1997 canvas.translate(-transX, -transY); 1998 canvas.concat(child.getMatrix()); 1999 canvas.translate(transX, transY); 2000 } 2001 2002 if (alpha < 1.0f) { 2003 mGroupFlags |= FLAG_CLEAR_TRANSFORMATION; 2004 2005 if (hasNoCache) { 2006 final int multipliedAlpha = (int) (255 * alpha); 2007 if (!child.onSetAlpha(multipliedAlpha)) { 2008 canvas.saveLayerAlpha(sx, sy, sx + cr - cl, sy + cb - ct, multipliedAlpha, 2009 Canvas.HAS_ALPHA_LAYER_SAVE_FLAG | Canvas.CLIP_TO_LAYER_SAVE_FLAG); 2010 } else { 2011 child.mPrivateFlags |= ALPHA_SET; 2012 } 2013 } 2014 } 2015 } else if ((child.mPrivateFlags & ALPHA_SET) == ALPHA_SET) { 2016 child.onSetAlpha(255); 2017 child.mPrivateFlags &= ~ALPHA_SET; 2018 } 2019 2020 if ((flags & FLAG_CLIP_CHILDREN) == FLAG_CLIP_CHILDREN) { 2021 if (hasNoCache) { 2022 canvas.clipRect(sx, sy, sx + (cr - cl), sy + (cb - ct)); 2023 } else { 2024 if (!scalingRequired) { 2025 canvas.clipRect(0, 0, cr - cl, cb - ct); 2026 } else { 2027 canvas.clipRect(0, 0, cache.getWidth(), cache.getHeight()); 2028 } 2029 } 2030 } 2031 2032 if (hasNoCache) { 2033 // Fast path for layouts with no backgrounds 2034 if ((child.mPrivateFlags & SKIP_DRAW) == SKIP_DRAW) { 2035 if (ViewDebug.TRACE_HIERARCHY) { 2036 ViewDebug.trace(this, ViewDebug.HierarchyTraceType.DRAW); 2037 } 2038 child.mPrivateFlags &= ~DIRTY_MASK; 2039 child.dispatchDraw(canvas); 2040 } else { 2041 child.draw(canvas); 2042 } 2043 } else { 2044 final Paint cachePaint = mCachePaint; 2045 if (alpha < 1.0f) { 2046 cachePaint.setAlpha((int) (alpha * 255)); 2047 mGroupFlags |= FLAG_ALPHA_LOWER_THAN_ONE; 2048 } else if ((flags & FLAG_ALPHA_LOWER_THAN_ONE) == FLAG_ALPHA_LOWER_THAN_ONE) { 2049 cachePaint.setAlpha(255); 2050 mGroupFlags &= ~FLAG_ALPHA_LOWER_THAN_ONE; 2051 } 2052 canvas.drawBitmap(cache, 0.0f, 0.0f, cachePaint); 2053 } 2054 2055 canvas.restoreToCount(restoreTo); 2056 2057 if (a != null && !more) { 2058 child.onSetAlpha(255); 2059 finishAnimatingView(child, a); 2060 } 2061 2062 return more; 2063 } 2064 2065 /** 2066 * By default, children are clipped to their bounds before drawing. This 2067 * allows view groups to override this behavior for animations, etc. 2068 * 2069 * @param clipChildren true to clip children to their bounds, 2070 * false otherwise 2071 * @attr ref android.R.styleable#ViewGroup_clipChildren 2072 */ 2073 public void setClipChildren(boolean clipChildren) { 2074 setBooleanFlag(FLAG_CLIP_CHILDREN, clipChildren); 2075 } 2076 2077 /** 2078 * By default, children are clipped to the padding of the ViewGroup. This 2079 * allows view groups to override this behavior 2080 * 2081 * @param clipToPadding true to clip children to the padding of the 2082 * group, false otherwise 2083 * @attr ref android.R.styleable#ViewGroup_clipToPadding 2084 */ 2085 public void setClipToPadding(boolean clipToPadding) { 2086 setBooleanFlag(FLAG_CLIP_TO_PADDING, clipToPadding); 2087 } 2088 2089 /** 2090 * {@inheritDoc} 2091 */ 2092 @Override 2093 public void dispatchSetSelected(boolean selected) { 2094 final View[] children = mChildren; 2095 final int count = mChildrenCount; 2096 for (int i = 0; i < count; i++) { 2097 2098 children[i].setSelected(selected); 2099 } 2100 } 2101 2102 /** 2103 * {@inheritDoc} 2104 */ 2105 @Override 2106 public void dispatchSetActivated(boolean activated) { 2107 final View[] children = mChildren; 2108 final int count = mChildrenCount; 2109 for (int i = 0; i < count; i++) { 2110 2111 children[i].setActivated(activated); 2112 } 2113 } 2114 2115 @Override 2116 protected void dispatchSetPressed(boolean pressed) { 2117 final View[] children = mChildren; 2118 final int count = mChildrenCount; 2119 for (int i = 0; i < count; i++) { 2120 children[i].setPressed(pressed); 2121 } 2122 } 2123 2124 /** 2125 * When this property is set to true, this ViewGroup supports static transformations on 2126 * children; this causes 2127 * {@link #getChildStaticTransformation(View, android.view.animation.Transformation)} to be 2128 * invoked when a child is drawn. 2129 * 2130 * Any subclass overriding 2131 * {@link #getChildStaticTransformation(View, android.view.animation.Transformation)} should 2132 * set this property to true. 2133 * 2134 * @param enabled True to enable static transformations on children, false otherwise. 2135 * 2136 * @see #FLAG_SUPPORT_STATIC_TRANSFORMATIONS 2137 */ 2138 protected void setStaticTransformationsEnabled(boolean enabled) { 2139 setBooleanFlag(FLAG_SUPPORT_STATIC_TRANSFORMATIONS, enabled); 2140 } 2141 2142 /** 2143 * {@inheritDoc} 2144 * 2145 * @see #setStaticTransformationsEnabled(boolean) 2146 */ 2147 protected boolean getChildStaticTransformation(View child, Transformation t) { 2148 return false; 2149 } 2150 2151 /** 2152 * {@hide} 2153 */ 2154 @Override 2155 protected View findViewTraversal(int id) { 2156 if (id == mID) { 2157 return this; 2158 } 2159 2160 final View[] where = mChildren; 2161 final int len = mChildrenCount; 2162 2163 for (int i = 0; i < len; i++) { 2164 View v = where[i]; 2165 2166 if ((v.mPrivateFlags & IS_ROOT_NAMESPACE) == 0) { 2167 v = v.findViewById(id); 2168 2169 if (v != null) { 2170 return v; 2171 } 2172 } 2173 } 2174 2175 return null; 2176 } 2177 2178 /** 2179 * {@hide} 2180 */ 2181 @Override 2182 protected View findViewWithTagTraversal(Object tag) { 2183 if (tag != null && tag.equals(mTag)) { 2184 return this; 2185 } 2186 2187 final View[] where = mChildren; 2188 final int len = mChildrenCount; 2189 2190 for (int i = 0; i < len; i++) { 2191 View v = where[i]; 2192 2193 if ((v.mPrivateFlags & IS_ROOT_NAMESPACE) == 0) { 2194 v = v.findViewWithTag(tag); 2195 2196 if (v != null) { 2197 return v; 2198 } 2199 } 2200 } 2201 2202 return null; 2203 } 2204 2205 /** 2206 * Adds a child view. If no layout parameters are already set on the child, the 2207 * default parameters for this ViewGroup are set on the child. 2208 * 2209 * @param child the child view to add 2210 * 2211 * @see #generateDefaultLayoutParams() 2212 */ 2213 public void addView(View child) { 2214 addView(child, -1); 2215 } 2216 2217 /** 2218 * Adds a child view. If no layout parameters are already set on the child, the 2219 * default parameters for this ViewGroup are set on the child. 2220 * 2221 * @param child the child view to add 2222 * @param index the position at which to add the child 2223 * 2224 * @see #generateDefaultLayoutParams() 2225 */ 2226 public void addView(View child, int index) { 2227 LayoutParams params = child.getLayoutParams(); 2228 if (params == null) { 2229 params = generateDefaultLayoutParams(); 2230 if (params == null) { 2231 throw new IllegalArgumentException("generateDefaultLayoutParams() cannot return null"); 2232 } 2233 } 2234 addView(child, index, params); 2235 } 2236 2237 /** 2238 * Adds a child view with this ViewGroup's default layout parameters and the 2239 * specified width and height. 2240 * 2241 * @param child the child view to add 2242 */ 2243 public void addView(View child, int width, int height) { 2244 final LayoutParams params = generateDefaultLayoutParams(); 2245 params.width = width; 2246 params.height = height; 2247 addView(child, -1, params); 2248 } 2249 2250 /** 2251 * Adds a child view with the specified layout parameters. 2252 * 2253 * @param child the child view to add 2254 * @param params the layout parameters to set on the child 2255 */ 2256 public void addView(View child, LayoutParams params) { 2257 addView(child, -1, params); 2258 } 2259 2260 /** 2261 * Adds a child view with the specified layout parameters. 2262 * 2263 * @param child the child view to add 2264 * @param index the position at which to add the child 2265 * @param params the layout parameters to set on the child 2266 */ 2267 public void addView(View child, int index, LayoutParams params) { 2268 if (DBG) { 2269 System.out.println(this + " addView"); 2270 } 2271 2272 // addViewInner() will call child.requestLayout() when setting the new LayoutParams 2273 // therefore, we call requestLayout() on ourselves before, so that the child's request 2274 // will be blocked at our level 2275 requestLayout(); 2276 invalidate(); 2277 addViewInner(child, index, params, false); 2278 } 2279 2280 /** 2281 * {@inheritDoc} 2282 */ 2283 public void updateViewLayout(View view, ViewGroup.LayoutParams params) { 2284 if (!checkLayoutParams(params)) { 2285 throw new IllegalArgumentException("Invalid LayoutParams supplied to " + this); 2286 } 2287 if (view.mParent != this) { 2288 throw new IllegalArgumentException("Given view not a child of " + this); 2289 } 2290 view.setLayoutParams(params); 2291 } 2292 2293 /** 2294 * {@inheritDoc} 2295 */ 2296 protected boolean checkLayoutParams(ViewGroup.LayoutParams p) { 2297 return p != null; 2298 } 2299 2300 /** 2301 * Interface definition for a callback to be invoked when the hierarchy 2302 * within this view changed. The hierarchy changes whenever a child is added 2303 * to or removed from this view. 2304 */ 2305 public interface OnHierarchyChangeListener { 2306 /** 2307 * Called when a new child is added to a parent view. 2308 * 2309 * @param parent the view in which a child was added 2310 * @param child the new child view added in the hierarchy 2311 */ 2312 void onChildViewAdded(View parent, View child); 2313 2314 /** 2315 * Called when a child is removed from a parent view. 2316 * 2317 * @param parent the view from which the child was removed 2318 * @param child the child removed from the hierarchy 2319 */ 2320 void onChildViewRemoved(View parent, View child); 2321 } 2322 2323 /** 2324 * Register a callback to be invoked when a child is added to or removed 2325 * from this view. 2326 * 2327 * @param listener the callback to invoke on hierarchy change 2328 */ 2329 public void setOnHierarchyChangeListener(OnHierarchyChangeListener listener) { 2330 mOnHierarchyChangeListener = listener; 2331 } 2332 2333 /** 2334 * Adds a view during layout. This is useful if in your onLayout() method, 2335 * you need to add more views (as does the list view for example). 2336 * 2337 * If index is negative, it means put it at the end of the list. 2338 * 2339 * @param child the view to add to the group 2340 * @param index the index at which the child must be added 2341 * @param params the layout parameters to associate with the child 2342 * @return true if the child was added, false otherwise 2343 */ 2344 protected boolean addViewInLayout(View child, int index, LayoutParams params) { 2345 return addViewInLayout(child, index, params, false); 2346 } 2347 2348 /** 2349 * Adds a view during layout. This is useful if in your onLayout() method, 2350 * you need to add more views (as does the list view for example). 2351 * 2352 * If index is negative, it means put it at the end of the list. 2353 * 2354 * @param child the view to add to the group 2355 * @param index the index at which the child must be added 2356 * @param params the layout parameters to associate with the child 2357 * @param preventRequestLayout if true, calling this method will not trigger a 2358 * layout request on child 2359 * @return true if the child was added, false otherwise 2360 */ 2361 protected boolean addViewInLayout(View child, int index, LayoutParams params, 2362 boolean preventRequestLayout) { 2363 child.mParent = null; 2364 addViewInner(child, index, params, preventRequestLayout); 2365 child.mPrivateFlags = (child.mPrivateFlags & ~DIRTY_MASK) | DRAWN; 2366 return true; 2367 } 2368 2369 /** 2370 * Prevents the specified child to be laid out during the next layout pass. 2371 * 2372 * @param child the child on which to perform the cleanup 2373 */ 2374 protected void cleanupLayoutState(View child) { 2375 child.mPrivateFlags &= ~View.FORCE_LAYOUT; 2376 } 2377 2378 private void addViewInner(View child, int index, LayoutParams params, 2379 boolean preventRequestLayout) { 2380 2381 if (child.getParent() != null) { 2382 throw new IllegalStateException("The specified child already has a parent. " + 2383 "You must call removeView() on the child's parent first."); 2384 } 2385 2386 if (mTransition != null) { 2387 mTransition.childAdd(this, child); 2388 } 2389 2390 if (!checkLayoutParams(params)) { 2391 params = generateLayoutParams(params); 2392 } 2393 2394 if (preventRequestLayout) { 2395 child.mLayoutParams = params; 2396 } else { 2397 child.setLayoutParams(params); 2398 } 2399 2400 if (index < 0) { 2401 index = mChildrenCount; 2402 } 2403 2404 addInArray(child, index); 2405 2406 // tell our children 2407 if (preventRequestLayout) { 2408 child.assignParent(this); 2409 } else { 2410 child.mParent = this; 2411 } 2412 2413 if (child.hasFocus()) { 2414 requestChildFocus(child, child.findFocus()); 2415 } 2416 2417 AttachInfo ai = mAttachInfo; 2418 if (ai != null) { 2419 boolean lastKeepOn = ai.mKeepScreenOn; 2420 ai.mKeepScreenOn = false; 2421 child.dispatchAttachedToWindow(mAttachInfo, (mViewFlags&VISIBILITY_MASK)); 2422 if (ai.mKeepScreenOn) { 2423 needGlobalAttributesUpdate(true); 2424 } 2425 ai.mKeepScreenOn = lastKeepOn; 2426 } 2427 2428 if (mOnHierarchyChangeListener != null) { 2429 mOnHierarchyChangeListener.onChildViewAdded(this, child); 2430 } 2431 2432 if ((child.mViewFlags & DUPLICATE_PARENT_STATE) == DUPLICATE_PARENT_STATE) { 2433 mGroupFlags |= FLAG_NOTIFY_CHILDREN_ON_DRAWABLE_STATE_CHANGE; 2434 } 2435 } 2436 2437 private void addInArray(View child, int index) { 2438 View[] children = mChildren; 2439 final int count = mChildrenCount; 2440 final int size = children.length; 2441 if (index == count) { 2442 if (size == count) { 2443 mChildren = new View[size + ARRAY_CAPACITY_INCREMENT]; 2444 System.arraycopy(children, 0, mChildren, 0, size); 2445 children = mChildren; 2446 } 2447 children[mChildrenCount++] = child; 2448 } else if (index < count) { 2449 if (size == count) { 2450 mChildren = new View[size + ARRAY_CAPACITY_INCREMENT]; 2451 System.arraycopy(children, 0, mChildren, 0, index); 2452 System.arraycopy(children, index, mChildren, index + 1, count - index); 2453 children = mChildren; 2454 } else { 2455 System.arraycopy(children, index, children, index + 1, count - index); 2456 } 2457 children[index] = child; 2458 mChildrenCount++; 2459 } else { 2460 throw new IndexOutOfBoundsException("index=" + index + " count=" + count); 2461 } 2462 } 2463 2464 // This method also sets the child's mParent to null 2465 private void removeFromArray(int index) { 2466 final View[] children = mChildren; 2467 if (!(mTransitioningViews != null && mTransitioningViews.contains(children[index]))) { 2468 children[index].mParent = null; 2469 } 2470 final int count = mChildrenCount; 2471 if (index == count - 1) { 2472 children[--mChildrenCount] = null; 2473 } else if (index >= 0 && index < count) { 2474 System.arraycopy(children, index + 1, children, index, count - index - 1); 2475 children[--mChildrenCount] = null; 2476 } else { 2477 throw new IndexOutOfBoundsException(); 2478 } 2479 } 2480 2481 // This method also sets the children's mParent to null 2482 private void removeFromArray(int start, int count) { 2483 final View[] children = mChildren; 2484 final int childrenCount = mChildrenCount; 2485 2486 start = Math.max(0, start); 2487 final int end = Math.min(childrenCount, start + count); 2488 2489 if (start == end) { 2490 return; 2491 } 2492 2493 if (end == childrenCount) { 2494 for (int i = start; i < end; i++) { 2495 children[i].mParent = null; 2496 children[i] = null; 2497 } 2498 } else { 2499 for (int i = start; i < end; i++) { 2500 children[i].mParent = null; 2501 } 2502 2503 // Since we're looping above, we might as well do the copy, but is arraycopy() 2504 // faster than the extra 2 bounds checks we would do in the loop? 2505 System.arraycopy(children, end, children, start, childrenCount - end); 2506 2507 for (int i = childrenCount - (end - start); i < childrenCount; i++) { 2508 children[i] = null; 2509 } 2510 } 2511 2512 mChildrenCount -= (end - start); 2513 } 2514 2515 private void bindLayoutAnimation(View child) { 2516 Animation a = mLayoutAnimationController.getAnimationForView(child); 2517 child.setAnimation(a); 2518 } 2519 2520 /** 2521 * Subclasses should override this method to set layout animation 2522 * parameters on the supplied child. 2523 * 2524 * @param child the child to associate with animation parameters 2525 * @param params the child's layout parameters which hold the animation 2526 * parameters 2527 * @param index the index of the child in the view group 2528 * @param count the number of children in the view group 2529 */ 2530 protected void attachLayoutAnimationParameters(View child, 2531 LayoutParams params, int index, int count) { 2532 LayoutAnimationController.AnimationParameters animationParams = 2533 params.layoutAnimationParameters; 2534 if (animationParams == null) { 2535 animationParams = new LayoutAnimationController.AnimationParameters(); 2536 params.layoutAnimationParameters = animationParams; 2537 } 2538 2539 animationParams.count = count; 2540 animationParams.index = index; 2541 } 2542 2543 /** 2544 * {@inheritDoc} 2545 */ 2546 public void removeView(View view) { 2547 removeViewInternal(view); 2548 requestLayout(); 2549 invalidate(); 2550 } 2551 2552 /** 2553 * Removes a view during layout. This is useful if in your onLayout() method, 2554 * you need to remove more views. 2555 * 2556 * @param view the view to remove from the group 2557 */ 2558 public void removeViewInLayout(View view) { 2559 removeViewInternal(view); 2560 } 2561 2562 /** 2563 * Removes a range of views during layout. This is useful if in your onLayout() method, 2564 * you need to remove more views. 2565 * 2566 * @param start the index of the first view to remove from the group 2567 * @param count the number of views to remove from the group 2568 */ 2569 public void removeViewsInLayout(int start, int count) { 2570 removeViewsInternal(start, count); 2571 } 2572 2573 /** 2574 * Removes the view at the specified position in the group. 2575 * 2576 * @param index the position in the group of the view to remove 2577 */ 2578 public void removeViewAt(int index) { 2579 removeViewInternal(index, getChildAt(index)); 2580 requestLayout(); 2581 invalidate(); 2582 } 2583 2584 /** 2585 * Removes the specified range of views from the group. 2586 * 2587 * @param start the first position in the group of the range of views to remove 2588 * @param count the number of views to remove 2589 */ 2590 public void removeViews(int start, int count) { 2591 removeViewsInternal(start, count); 2592 requestLayout(); 2593 invalidate(); 2594 } 2595 2596 private void removeViewInternal(View view) { 2597 final int index = indexOfChild(view); 2598 if (index >= 0) { 2599 removeViewInternal(index, view); 2600 } 2601 } 2602 2603 private void removeViewInternal(int index, View view) { 2604 2605 if (mTransition != null) { 2606 mTransition.childRemove(this, view); 2607 } 2608 2609 boolean clearChildFocus = false; 2610 if (view == mFocused) { 2611 view.clearFocusForRemoval(); 2612 clearChildFocus = true; 2613 } 2614 2615 if (view.getAnimation() != null || 2616 (mTransitioningViews != null && mTransitioningViews.contains(view))) { 2617 addDisappearingView(view); 2618 } else if (view.mAttachInfo != null) { 2619 view.dispatchDetachedFromWindow(); 2620 } 2621 2622 if (mOnHierarchyChangeListener != null) { 2623 mOnHierarchyChangeListener.onChildViewRemoved(this, view); 2624 } 2625 2626 needGlobalAttributesUpdate(false); 2627 2628 removeFromArray(index); 2629 2630 if (clearChildFocus) { 2631 clearChildFocus(view); 2632 } 2633 } 2634 2635 /** 2636 * Sets the LayoutTransition object for this ViewGroup. If the LayoutTransition object is 2637 * not null, changes in layout which occur because of children being added to or removed from 2638 * the ViewGroup will be animated according to the animations defined in that LayoutTransition 2639 * object. By default, the transition object is null (so layout changes are not animated). 2640 * 2641 * @param transition The LayoutTransition object that will animated changes in layout. A value 2642 * of <code>null</code> means no transition will run on layout changes. 2643 * @attr ref android.R.styleable#ViewGroup_animateLayoutChanges 2644 */ 2645 public void setLayoutTransition(LayoutTransition transition) { 2646 if (mTransition != null) { 2647 mTransition.removeTransitionListener(mLayoutTransitionListener); 2648 } 2649 mTransition = transition; 2650 if (mTransition != null) { 2651 mTransition.addTransitionListener(mLayoutTransitionListener); 2652 } 2653 } 2654 2655 /** 2656 * Gets the LayoutTransition object for this ViewGroup. If the LayoutTransition object is 2657 * not null, changes in layout which occur because of children being added to or removed from 2658 * the ViewGroup will be animated according to the animations defined in that LayoutTransition 2659 * object. By default, the transition object is null (so layout changes are not animated). 2660 * 2661 * @return LayoutTranstion The LayoutTransition object that will animated changes in layout. 2662 * A value of <code>null</code> means no transition will run on layout changes. 2663 */ 2664 public LayoutTransition getLayoutTransition() { 2665 return mTransition; 2666 } 2667 2668 private void removeViewsInternal(int start, int count) { 2669 final OnHierarchyChangeListener onHierarchyChangeListener = mOnHierarchyChangeListener; 2670 final boolean notifyListener = onHierarchyChangeListener != null; 2671 final View focused = mFocused; 2672 final boolean detach = mAttachInfo != null; 2673 View clearChildFocus = null; 2674 2675 final View[] children = mChildren; 2676 final int end = start + count; 2677 2678 for (int i = start; i < end; i++) { 2679 final View view = children[i]; 2680 2681 if (mTransition != null) { 2682 mTransition.childRemove(this, view); 2683 } 2684 2685 if (view == focused) { 2686 view.clearFocusForRemoval(); 2687 clearChildFocus = view; 2688 } 2689 2690 if (view.getAnimation() != null || 2691 (mTransitioningViews != null && mTransitioningViews.contains(view))) { 2692 addDisappearingView(view); 2693 } else if (detach) { 2694 view.dispatchDetachedFromWindow(); 2695 } 2696 2697 needGlobalAttributesUpdate(false); 2698 2699 if (notifyListener) { 2700 onHierarchyChangeListener.onChildViewRemoved(this, view); 2701 } 2702 } 2703 2704 removeFromArray(start, count); 2705 2706 if (clearChildFocus != null) { 2707 clearChildFocus(clearChildFocus); 2708 } 2709 } 2710 2711 /** 2712 * Call this method to remove all child views from the 2713 * ViewGroup. 2714 */ 2715 public void removeAllViews() { 2716 removeAllViewsInLayout(); 2717 requestLayout(); 2718 invalidate(); 2719 } 2720 2721 /** 2722 * Called by a ViewGroup subclass to remove child views from itself, 2723 * when it must first know its size on screen before it can calculate how many 2724 * child views it will render. An example is a Gallery or a ListView, which 2725 * may "have" 50 children, but actually only render the number of children 2726 * that can currently fit inside the object on screen. Do not call 2727 * this method unless you are extending ViewGroup and understand the 2728 * view measuring and layout pipeline. 2729 */ 2730 public void removeAllViewsInLayout() { 2731 final int count = mChildrenCount; 2732 if (count <= 0) { 2733 return; 2734 } 2735 2736 final View[] children = mChildren; 2737 mChildrenCount = 0; 2738 2739 final OnHierarchyChangeListener listener = mOnHierarchyChangeListener; 2740 final boolean notify = listener != null; 2741 final View focused = mFocused; 2742 final boolean detach = mAttachInfo != null; 2743 View clearChildFocus = null; 2744 2745 needGlobalAttributesUpdate(false); 2746 2747 for (int i = count - 1; i >= 0; i--) { 2748 final View view = children[i]; 2749 2750 if (mTransition != null) { 2751 mTransition.childRemove(this, view); 2752 } 2753 2754 if (view == focused) { 2755 view.clearFocusForRemoval(); 2756 clearChildFocus = view; 2757 } 2758 2759 if (view.getAnimation() != null || 2760 (mTransitioningViews != null && mTransitioningViews.contains(view))) { 2761 addDisappearingView(view); 2762 } else if (detach) { 2763 view.dispatchDetachedFromWindow(); 2764 } 2765 2766 if (notify) { 2767 listener.onChildViewRemoved(this, view); 2768 } 2769 2770 view.mParent = null; 2771 children[i] = null; 2772 } 2773 2774 if (clearChildFocus != null) { 2775 clearChildFocus(clearChildFocus); 2776 } 2777 2778 mGroupFlags &= ~FLAG_CHILD_HAS_OVERLAY; 2779 } 2780 2781 /** 2782 * Finishes the removal of a detached view. This method will dispatch the detached from 2783 * window event and notify the hierarchy change listener. 2784 * 2785 * @param child the child to be definitely removed from the view hierarchy 2786 * @param animate if true and the view has an animation, the view is placed in the 2787 * disappearing views list, otherwise, it is detached from the window 2788 * 2789 * @see #attachViewToParent(View, int, android.view.ViewGroup.LayoutParams) 2790 * @see #detachAllViewsFromParent() 2791 * @see #detachViewFromParent(View) 2792 * @see #detachViewFromParent(int) 2793 */ 2794 protected void removeDetachedView(View child, boolean animate) { 2795 if (mTransition != null) { 2796 mTransition.childRemove(this, child); 2797 } 2798 2799 if (child == mFocused) { 2800 child.clearFocus(); 2801 } 2802 2803 if ((animate && child.getAnimation() != null) || 2804 (mTransitioningViews != null && mTransitioningViews.contains(child))) { 2805 addDisappearingView(child); 2806 } else if (child.mAttachInfo != null) { 2807 child.dispatchDetachedFromWindow(); 2808 } 2809 2810 if (mOnHierarchyChangeListener != null) { 2811 mOnHierarchyChangeListener.onChildViewRemoved(this, child); 2812 } 2813 } 2814 2815 /** 2816 * Attaches a view to this view group. Attaching a view assigns this group as the parent, 2817 * sets the layout parameters and puts the view in the list of children so it can be retrieved 2818 * by calling {@link #getChildAt(int)}. 2819 * 2820 * This method should be called only for view which were detached from their parent. 2821 * 2822 * @param child the child to attach 2823 * @param index the index at which the child should be attached 2824 * @param params the layout parameters of the child 2825 * 2826 * @see #removeDetachedView(View, boolean) 2827 * @see #detachAllViewsFromParent() 2828 * @see #detachViewFromParent(View) 2829 * @see #detachViewFromParent(int) 2830 */ 2831 protected void attachViewToParent(View child, int index, LayoutParams params) { 2832 child.mLayoutParams = params; 2833 2834 if (index < 0) { 2835 index = mChildrenCount; 2836 } 2837 2838 addInArray(child, index); 2839 2840 child.mParent = this; 2841 child.mPrivateFlags = (child.mPrivateFlags & ~DIRTY_MASK & ~DRAWING_CACHE_VALID) | DRAWN; 2842 2843 if (child.hasFocus()) { 2844 requestChildFocus(child, child.findFocus()); 2845 } 2846 } 2847 2848 /** 2849 * Detaches a view from its parent. Detaching a view should be temporary and followed 2850 * either by a call to {@link #attachViewToParent(View, int, android.view.ViewGroup.LayoutParams)} 2851 * or a call to {@link #removeDetachedView(View, boolean)}. When a view is detached, 2852 * its parent is null and cannot be retrieved by a call to {@link #getChildAt(int)}. 2853 * 2854 * @param child the child to detach 2855 * 2856 * @see #detachViewFromParent(int) 2857 * @see #detachViewsFromParent(int, int) 2858 * @see #detachAllViewsFromParent() 2859 * @see #attachViewToParent(View, int, android.view.ViewGroup.LayoutParams) 2860 * @see #removeDetachedView(View, boolean) 2861 */ 2862 protected void detachViewFromParent(View child) { 2863 removeFromArray(indexOfChild(child)); 2864 } 2865 2866 /** 2867 * Detaches a view from its parent. Detaching a view should be temporary and followed 2868 * either by a call to {@link #attachViewToParent(View, int, android.view.ViewGroup.LayoutParams)} 2869 * or a call to {@link #removeDetachedView(View, boolean)}. When a view is detached, 2870 * its parent is null and cannot be retrieved by a call to {@link #getChildAt(int)}. 2871 * 2872 * @param index the index of the child to detach 2873 * 2874 * @see #detachViewFromParent(View) 2875 * @see #detachAllViewsFromParent() 2876 * @see #detachViewsFromParent(int, int) 2877 * @see #attachViewToParent(View, int, android.view.ViewGroup.LayoutParams) 2878 * @see #removeDetachedView(View, boolean) 2879 */ 2880 protected void detachViewFromParent(int index) { 2881 removeFromArray(index); 2882 } 2883 2884 /** 2885 * Detaches a range of view from their parent. Detaching a view should be temporary and followed 2886 * either by a call to {@link #attachViewToParent(View, int, android.view.ViewGroup.LayoutParams)} 2887 * or a call to {@link #removeDetachedView(View, boolean)}. When a view is detached, its 2888 * parent is null and cannot be retrieved by a call to {@link #getChildAt(int)}. 2889 * 2890 * @param start the first index of the childrend range to detach 2891 * @param count the number of children to detach 2892 * 2893 * @see #detachViewFromParent(View) 2894 * @see #detachViewFromParent(int) 2895 * @see #detachAllViewsFromParent() 2896 * @see #attachViewToParent(View, int, android.view.ViewGroup.LayoutParams) 2897 * @see #removeDetachedView(View, boolean) 2898 */ 2899 protected void detachViewsFromParent(int start, int count) { 2900 removeFromArray(start, count); 2901 } 2902 2903 /** 2904 * Detaches all views from the parent. Detaching a view should be temporary and followed 2905 * either by a call to {@link #attachViewToParent(View, int, android.view.ViewGroup.LayoutParams)} 2906 * or a call to {@link #removeDetachedView(View, boolean)}. When a view is detached, 2907 * its parent is null and cannot be retrieved by a call to {@link #getChildAt(int)}. 2908 * 2909 * @see #detachViewFromParent(View) 2910 * @see #detachViewFromParent(int) 2911 * @see #detachViewsFromParent(int, int) 2912 * @see #attachViewToParent(View, int, android.view.ViewGroup.LayoutParams) 2913 * @see #removeDetachedView(View, boolean) 2914 */ 2915 protected void detachAllViewsFromParent() { 2916 final int count = mChildrenCount; 2917 if (count <= 0) { 2918 return; 2919 } 2920 2921 final View[] children = mChildren; 2922 mChildrenCount = 0; 2923 2924 for (int i = count - 1; i >= 0; i--) { 2925 children[i].mParent = null; 2926 children[i] = null; 2927 } 2928 } 2929 2930 /** 2931 * Don't call or override this method. It is used for the implementation of 2932 * the view hierarchy. 2933 */ 2934 public final void invalidateChild(View child, final Rect dirty) { 2935 if (ViewDebug.TRACE_HIERARCHY) { 2936 ViewDebug.trace(this, ViewDebug.HierarchyTraceType.INVALIDATE_CHILD); 2937 } 2938 2939 ViewParent parent = this; 2940 2941 final AttachInfo attachInfo = mAttachInfo; 2942 if (attachInfo != null) { 2943 final int[] location = attachInfo.mInvalidateChildLocation; 2944 location[CHILD_LEFT_INDEX] = child.mLeft; 2945 location[CHILD_TOP_INDEX] = child.mTop; 2946 Matrix childMatrix = child.getMatrix(); 2947 if (!childMatrix.isIdentity()) { 2948 RectF boundingRect = attachInfo.mTmpTransformRect; 2949 boundingRect.set(dirty); 2950 childMatrix.mapRect(boundingRect); 2951 dirty.set((int) boundingRect.left, (int) boundingRect.top, 2952 (int) (boundingRect.right + 0.5f), 2953 (int) (boundingRect.bottom + 0.5f)); 2954 } 2955 2956 // If the child is drawing an animation, we want to copy this flag onto 2957 // ourselves and the parent to make sure the invalidate request goes 2958 // through 2959 final boolean drawAnimation = (child.mPrivateFlags & DRAW_ANIMATION) == DRAW_ANIMATION; 2960 2961 // Check whether the child that requests the invalidate is fully opaque 2962 final boolean isOpaque = child.isOpaque() && !drawAnimation && 2963 child.getAnimation() != null; 2964 // Mark the child as dirty, using the appropriate flag 2965 // Make sure we do not set both flags at the same time 2966 final int opaqueFlag = isOpaque ? DIRTY_OPAQUE : DIRTY; 2967 2968 do { 2969 View view = null; 2970 if (parent instanceof View) { 2971 view = (View) parent; 2972 } 2973 2974 if (drawAnimation) { 2975 if (view != null) { 2976 view.mPrivateFlags |= DRAW_ANIMATION; 2977 } else if (parent instanceof ViewRoot) { 2978 ((ViewRoot) parent).mIsAnimating = true; 2979 } 2980 } 2981 2982 // If the parent is dirty opaque or not dirty, mark it dirty with the opaque 2983 // flag coming from the child that initiated the invalidate 2984 if (view != null && (view.mPrivateFlags & DIRTY_MASK) != DIRTY) { 2985 view.mPrivateFlags = (view.mPrivateFlags & ~DIRTY_MASK) | opaqueFlag; 2986 } 2987 2988 parent = parent.invalidateChildInParent(location, dirty); 2989 if (view != null) { 2990 // Account for transform on current parent 2991 Matrix m = view.getMatrix(); 2992 if (!m.isIdentity()) { 2993 RectF boundingRect = attachInfo.mTmpTransformRect; 2994 boundingRect.set(dirty); 2995 m.mapRect(boundingRect); 2996 dirty.set((int) boundingRect.left, (int) boundingRect.top, 2997 (int) (boundingRect.right + 0.5f), 2998 (int) (boundingRect.bottom + 0.5f)); 2999 } 3000 } 3001 } while (parent != null); 3002 } 3003 } 3004 3005 /** 3006 * Don't call or override this method. It is used for the implementation of 3007 * the view hierarchy. 3008 * 3009 * This implementation returns null if this ViewGroup does not have a parent, 3010 * if this ViewGroup is already fully invalidated or if the dirty rectangle 3011 * does not intersect with this ViewGroup's bounds. 3012 */ 3013 public ViewParent invalidateChildInParent(final int[] location, final Rect dirty) { 3014 if (ViewDebug.TRACE_HIERARCHY) { 3015 ViewDebug.trace(this, ViewDebug.HierarchyTraceType.INVALIDATE_CHILD_IN_PARENT); 3016 } 3017 3018 if ((mPrivateFlags & DRAWN) == DRAWN) { 3019 if ((mGroupFlags & (FLAG_OPTIMIZE_INVALIDATE | FLAG_ANIMATION_DONE)) != 3020 FLAG_OPTIMIZE_INVALIDATE) { 3021 dirty.offset(location[CHILD_LEFT_INDEX] - mScrollX, 3022 location[CHILD_TOP_INDEX] - mScrollY); 3023 3024 final int left = mLeft; 3025 final int top = mTop; 3026 3027 if ((mGroupFlags & FLAG_CHILD_HAS_OVERLAY) == FLAG_CHILD_HAS_OVERLAY || 3028 dirty.intersect(0, 0, mRight - left, mBottom - top) || 3029 (mPrivateFlags & DRAW_ANIMATION) == DRAW_ANIMATION) { 3030 mPrivateFlags &= ~DRAWING_CACHE_VALID; 3031 3032 location[CHILD_LEFT_INDEX] = left; 3033 location[CHILD_TOP_INDEX] = top; 3034 3035 return mParent; 3036 } 3037 } else { 3038 mPrivateFlags &= ~DRAWN & ~DRAWING_CACHE_VALID; 3039 3040 location[CHILD_LEFT_INDEX] = mLeft; 3041 location[CHILD_TOP_INDEX] = mTop; 3042 3043 dirty.set(0, 0, mRight - location[CHILD_LEFT_INDEX], 3044 mBottom - location[CHILD_TOP_INDEX]); 3045 3046 return mParent; 3047 } 3048 } 3049 3050 return null; 3051 } 3052 3053 /** 3054 * Offset a rectangle that is in a descendant's coordinate 3055 * space into our coordinate space. 3056 * @param descendant A descendant of this view 3057 * @param rect A rectangle defined in descendant's coordinate space. 3058 */ 3059 public final void offsetDescendantRectToMyCoords(View descendant, Rect rect) { 3060 offsetRectBetweenParentAndChild(descendant, rect, true, false); 3061 } 3062 3063 /** 3064 * Offset a rectangle that is in our coordinate space into an ancestor's 3065 * coordinate space. 3066 * @param descendant A descendant of this view 3067 * @param rect A rectangle defined in descendant's coordinate space. 3068 */ 3069 public final void offsetRectIntoDescendantCoords(View descendant, Rect rect) { 3070 offsetRectBetweenParentAndChild(descendant, rect, false, false); 3071 } 3072 3073 /** 3074 * Helper method that offsets a rect either from parent to descendant or 3075 * descendant to parent. 3076 */ 3077 void offsetRectBetweenParentAndChild(View descendant, Rect rect, 3078 boolean offsetFromChildToParent, boolean clipToBounds) { 3079 3080 // already in the same coord system :) 3081 if (descendant == this) { 3082 return; 3083 } 3084 3085 ViewParent theParent = descendant.mParent; 3086 3087 // search and offset up to the parent 3088 while ((theParent != null) 3089 && (theParent instanceof View) 3090 && (theParent != this)) { 3091 3092 if (offsetFromChildToParent) { 3093 rect.offset(descendant.mLeft - descendant.mScrollX, 3094 descendant.mTop - descendant.mScrollY); 3095 if (clipToBounds) { 3096 View p = (View) theParent; 3097 rect.intersect(0, 0, p.mRight - p.mLeft, p.mBottom - p.mTop); 3098 } 3099 } else { 3100 if (clipToBounds) { 3101 View p = (View) theParent; 3102 rect.intersect(0, 0, p.mRight - p.mLeft, p.mBottom - p.mTop); 3103 } 3104 rect.offset(descendant.mScrollX - descendant.mLeft, 3105 descendant.mScrollY - descendant.mTop); 3106 } 3107 3108 descendant = (View) theParent; 3109 theParent = descendant.mParent; 3110 } 3111 3112 // now that we are up to this view, need to offset one more time 3113 // to get into our coordinate space 3114 if (theParent == this) { 3115 if (offsetFromChildToParent) { 3116 rect.offset(descendant.mLeft - descendant.mScrollX, 3117 descendant.mTop - descendant.mScrollY); 3118 } else { 3119 rect.offset(descendant.mScrollX - descendant.mLeft, 3120 descendant.mScrollY - descendant.mTop); 3121 } 3122 } else { 3123 throw new IllegalArgumentException("parameter must be a descendant of this view"); 3124 } 3125 } 3126 3127 /** 3128 * Offset the vertical location of all children of this view by the specified number of pixels. 3129 * 3130 * @param offset the number of pixels to offset 3131 * 3132 * @hide 3133 */ 3134 public void offsetChildrenTopAndBottom(int offset) { 3135 final int count = mChildrenCount; 3136 final View[] children = mChildren; 3137 3138 for (int i = 0; i < count; i++) { 3139 final View v = children[i]; 3140 v.mTop += offset; 3141 v.mBottom += offset; 3142 } 3143 } 3144 3145 /** 3146 * {@inheritDoc} 3147 */ 3148 public boolean getChildVisibleRect(View child, Rect r, android.graphics.Point offset) { 3149 int dx = child.mLeft - mScrollX; 3150 int dy = child.mTop - mScrollY; 3151 if (offset != null) { 3152 offset.x += dx; 3153 offset.y += dy; 3154 } 3155 r.offset(dx, dy); 3156 return r.intersect(0, 0, mRight - mLeft, mBottom - mTop) && 3157 (mParent == null || mParent.getChildVisibleRect(this, r, offset)); 3158 } 3159 3160 /** 3161 * {@inheritDoc} 3162 */ 3163 @Override 3164 protected abstract void onLayout(boolean changed, 3165 int l, int t, int r, int b); 3166 3167 /** 3168 * Indicates whether the view group has the ability to animate its children 3169 * after the first layout. 3170 * 3171 * @return true if the children can be animated, false otherwise 3172 */ 3173 protected boolean canAnimate() { 3174 return mLayoutAnimationController != null; 3175 } 3176 3177 /** 3178 * Runs the layout animation. Calling this method triggers a relayout of 3179 * this view group. 3180 */ 3181 public void startLayoutAnimation() { 3182 if (mLayoutAnimationController != null) { 3183 mGroupFlags |= FLAG_RUN_ANIMATION; 3184 requestLayout(); 3185 } 3186 } 3187 3188 /** 3189 * Schedules the layout animation to be played after the next layout pass 3190 * of this view group. This can be used to restart the layout animation 3191 * when the content of the view group changes or when the activity is 3192 * paused and resumed. 3193 */ 3194 public void scheduleLayoutAnimation() { 3195 mGroupFlags |= FLAG_RUN_ANIMATION; 3196 } 3197 3198 /** 3199 * Sets the layout animation controller used to animate the group's 3200 * children after the first layout. 3201 * 3202 * @param controller the animation controller 3203 */ 3204 public void setLayoutAnimation(LayoutAnimationController controller) { 3205 mLayoutAnimationController = controller; 3206 if (mLayoutAnimationController != null) { 3207 mGroupFlags |= FLAG_RUN_ANIMATION; 3208 } 3209 } 3210 3211 /** 3212 * Returns the layout animation controller used to animate the group's 3213 * children. 3214 * 3215 * @return the current animation controller 3216 */ 3217 public LayoutAnimationController getLayoutAnimation() { 3218 return mLayoutAnimationController; 3219 } 3220 3221 /** 3222 * Indicates whether the children's drawing cache is used during a layout 3223 * animation. By default, the drawing cache is enabled but this will prevent 3224 * nested layout animations from working. To nest animations, you must disable 3225 * the cache. 3226 * 3227 * @return true if the animation cache is enabled, false otherwise 3228 * 3229 * @see #setAnimationCacheEnabled(boolean) 3230 * @see View#setDrawingCacheEnabled(boolean) 3231 */ 3232 @ViewDebug.ExportedProperty 3233 public boolean isAnimationCacheEnabled() { 3234 return (mGroupFlags & FLAG_ANIMATION_CACHE) == FLAG_ANIMATION_CACHE; 3235 } 3236 3237 /** 3238 * Enables or disables the children's drawing cache during a layout animation. 3239 * By default, the drawing cache is enabled but this will prevent nested 3240 * layout animations from working. To nest animations, you must disable the 3241 * cache. 3242 * 3243 * @param enabled true to enable the animation cache, false otherwise 3244 * 3245 * @see #isAnimationCacheEnabled() 3246 * @see View#setDrawingCacheEnabled(boolean) 3247 */ 3248 public void setAnimationCacheEnabled(boolean enabled) { 3249 setBooleanFlag(FLAG_ANIMATION_CACHE, enabled); 3250 } 3251 3252 /** 3253 * Indicates whether this ViewGroup will always try to draw its children using their 3254 * drawing cache. By default this property is enabled. 3255 * 3256 * @return true if the animation cache is enabled, false otherwise 3257 * 3258 * @see #setAlwaysDrawnWithCacheEnabled(boolean) 3259 * @see #setChildrenDrawnWithCacheEnabled(boolean) 3260 * @see View#setDrawingCacheEnabled(boolean) 3261 */ 3262 @ViewDebug.ExportedProperty(category = "drawing") 3263 public boolean isAlwaysDrawnWithCacheEnabled() { 3264 return (mGroupFlags & FLAG_ALWAYS_DRAWN_WITH_CACHE) == FLAG_ALWAYS_DRAWN_WITH_CACHE; 3265 } 3266 3267 /** 3268 * Indicates whether this ViewGroup will always try to draw its children using their 3269 * drawing cache. This property can be set to true when the cache rendering is 3270 * slightly different from the children's normal rendering. Renderings can be different, 3271 * for instance, when the cache's quality is set to low. 3272 * 3273 * When this property is disabled, the ViewGroup will use the drawing cache of its 3274 * children only when asked to. It's usually the task of subclasses to tell ViewGroup 3275 * when to start using the drawing cache and when to stop using it. 3276 * 3277 * @param always true to always draw with the drawing cache, false otherwise 3278 * 3279 * @see #isAlwaysDrawnWithCacheEnabled() 3280 * @see #setChildrenDrawnWithCacheEnabled(boolean) 3281 * @see View#setDrawingCacheEnabled(boolean) 3282 * @see View#setDrawingCacheQuality(int) 3283 */ 3284 public void setAlwaysDrawnWithCacheEnabled(boolean always) { 3285 setBooleanFlag(FLAG_ALWAYS_DRAWN_WITH_CACHE, always); 3286 } 3287 3288 /** 3289 * Indicates whether the ViewGroup is currently drawing its children using 3290 * their drawing cache. 3291 * 3292 * @return true if children should be drawn with their cache, false otherwise 3293 * 3294 * @see #setAlwaysDrawnWithCacheEnabled(boolean) 3295 * @see #setChildrenDrawnWithCacheEnabled(boolean) 3296 */ 3297 @ViewDebug.ExportedProperty(category = "drawing") 3298 protected boolean isChildrenDrawnWithCacheEnabled() { 3299 return (mGroupFlags & FLAG_CHILDREN_DRAWN_WITH_CACHE) == FLAG_CHILDREN_DRAWN_WITH_CACHE; 3300 } 3301 3302 /** 3303 * Tells the ViewGroup to draw its children using their drawing cache. This property 3304 * is ignored when {@link #isAlwaysDrawnWithCacheEnabled()} is true. A child's drawing cache 3305 * will be used only if it has been enabled. 3306 * 3307 * Subclasses should call this method to start and stop using the drawing cache when 3308 * they perform performance sensitive operations, like scrolling or animating. 3309 * 3310 * @param enabled true if children should be drawn with their cache, false otherwise 3311 * 3312 * @see #setAlwaysDrawnWithCacheEnabled(boolean) 3313 * @see #isChildrenDrawnWithCacheEnabled() 3314 */ 3315 protected void setChildrenDrawnWithCacheEnabled(boolean enabled) { 3316 setBooleanFlag(FLAG_CHILDREN_DRAWN_WITH_CACHE, enabled); 3317 } 3318 3319 /** 3320 * Indicates whether the ViewGroup is drawing its children in the order defined by 3321 * {@link #getChildDrawingOrder(int, int)}. 3322 * 3323 * @return true if children drawing order is defined by {@link #getChildDrawingOrder(int, int)}, 3324 * false otherwise 3325 * 3326 * @see #setChildrenDrawingOrderEnabled(boolean) 3327 * @see #getChildDrawingOrder(int, int) 3328 */ 3329 @ViewDebug.ExportedProperty(category = "drawing") 3330 protected boolean isChildrenDrawingOrderEnabled() { 3331 return (mGroupFlags & FLAG_USE_CHILD_DRAWING_ORDER) == FLAG_USE_CHILD_DRAWING_ORDER; 3332 } 3333 3334 /** 3335 * Tells the ViewGroup whether to draw its children in the order defined by the method 3336 * {@link #getChildDrawingOrder(int, int)}. 3337 * 3338 * @param enabled true if the order of the children when drawing is determined by 3339 * {@link #getChildDrawingOrder(int, int)}, false otherwise 3340 * 3341 * @see #isChildrenDrawingOrderEnabled() 3342 * @see #getChildDrawingOrder(int, int) 3343 */ 3344 protected void setChildrenDrawingOrderEnabled(boolean enabled) { 3345 setBooleanFlag(FLAG_USE_CHILD_DRAWING_ORDER, enabled); 3346 } 3347 3348 private void setBooleanFlag(int flag, boolean value) { 3349 if (value) { 3350 mGroupFlags |= flag; 3351 } else { 3352 mGroupFlags &= ~flag; 3353 } 3354 } 3355 3356 /** 3357 * Returns an integer indicating what types of drawing caches are kept in memory. 3358 * 3359 * @see #setPersistentDrawingCache(int) 3360 * @see #setAnimationCacheEnabled(boolean) 3361 * 3362 * @return one or a combination of {@link #PERSISTENT_NO_CACHE}, 3363 * {@link #PERSISTENT_ANIMATION_CACHE}, {@link #PERSISTENT_SCROLLING_CACHE} 3364 * and {@link #PERSISTENT_ALL_CACHES} 3365 */ 3366 @ViewDebug.ExportedProperty(category = "drawing", mapping = { 3367 @ViewDebug.IntToString(from = PERSISTENT_NO_CACHE, to = "NONE"), 3368 @ViewDebug.IntToString(from = PERSISTENT_ANIMATION_CACHE, to = "ANIMATION"), 3369 @ViewDebug.IntToString(from = PERSISTENT_SCROLLING_CACHE, to = "SCROLLING"), 3370 @ViewDebug.IntToString(from = PERSISTENT_ALL_CACHES, to = "ALL") 3371 }) 3372 public int getPersistentDrawingCache() { 3373 return mPersistentDrawingCache; 3374 } 3375 3376 /** 3377 * Indicates what types of drawing caches should be kept in memory after 3378 * they have been created. 3379 * 3380 * @see #getPersistentDrawingCache() 3381 * @see #setAnimationCacheEnabled(boolean) 3382 * 3383 * @param drawingCacheToKeep one or a combination of {@link #PERSISTENT_NO_CACHE}, 3384 * {@link #PERSISTENT_ANIMATION_CACHE}, {@link #PERSISTENT_SCROLLING_CACHE} 3385 * and {@link #PERSISTENT_ALL_CACHES} 3386 */ 3387 public void setPersistentDrawingCache(int drawingCacheToKeep) { 3388 mPersistentDrawingCache = drawingCacheToKeep & PERSISTENT_ALL_CACHES; 3389 } 3390 3391 /** 3392 * Returns a new set of layout parameters based on the supplied attributes set. 3393 * 3394 * @param attrs the attributes to build the layout parameters from 3395 * 3396 * @return an instance of {@link android.view.ViewGroup.LayoutParams} or one 3397 * of its descendants 3398 */ 3399 public LayoutParams generateLayoutParams(AttributeSet attrs) { 3400 return new LayoutParams(getContext(), attrs); 3401 } 3402 3403 /** 3404 * Returns a safe set of layout parameters based on the supplied layout params. 3405 * When a ViewGroup is passed a View whose layout params do not pass the test of 3406 * {@link #checkLayoutParams(android.view.ViewGroup.LayoutParams)}, this method 3407 * is invoked. This method should return a new set of layout params suitable for 3408 * this ViewGroup, possibly by copying the appropriate attributes from the 3409 * specified set of layout params. 3410 * 3411 * @param p The layout parameters to convert into a suitable set of layout parameters 3412 * for this ViewGroup. 3413 * 3414 * @return an instance of {@link android.view.ViewGroup.LayoutParams} or one 3415 * of its descendants 3416 */ 3417 protected LayoutParams generateLayoutParams(ViewGroup.LayoutParams p) { 3418 return p; 3419 } 3420 3421 /** 3422 * Returns a set of default layout parameters. These parameters are requested 3423 * when the View passed to {@link #addView(View)} has no layout parameters 3424 * already set. If null is returned, an exception is thrown from addView. 3425 * 3426 * @return a set of default layout parameters or null 3427 */ 3428 protected LayoutParams generateDefaultLayoutParams() { 3429 return new LayoutParams(LayoutParams.WRAP_CONTENT, LayoutParams.WRAP_CONTENT); 3430 } 3431 3432 /** 3433 * @hide 3434 */ 3435 @Override 3436 protected boolean dispatchConsistencyCheck(int consistency) { 3437 boolean result = super.dispatchConsistencyCheck(consistency); 3438 3439 final int count = mChildrenCount; 3440 final View[] children = mChildren; 3441 for (int i = 0; i < count; i++) { 3442 if (!children[i].dispatchConsistencyCheck(consistency)) result = false; 3443 } 3444 3445 return result; 3446 } 3447 3448 /** 3449 * @hide 3450 */ 3451 @Override 3452 protected boolean onConsistencyCheck(int consistency) { 3453 boolean result = super.onConsistencyCheck(consistency); 3454 3455 final boolean checkLayout = (consistency & ViewDebug.CONSISTENCY_LAYOUT) != 0; 3456 final boolean checkDrawing = (consistency & ViewDebug.CONSISTENCY_DRAWING) != 0; 3457 3458 if (checkLayout) { 3459 final int count = mChildrenCount; 3460 final View[] children = mChildren; 3461 for (int i = 0; i < count; i++) { 3462 if (children[i].getParent() != this) { 3463 result = false; 3464 android.util.Log.d(ViewDebug.CONSISTENCY_LOG_TAG, 3465 "View " + children[i] + " has no parent/a parent that is not " + this); 3466 } 3467 } 3468 } 3469 3470 if (checkDrawing) { 3471 // If this group is dirty, check that the parent is dirty as well 3472 if ((mPrivateFlags & DIRTY_MASK) != 0) { 3473 final ViewParent parent = getParent(); 3474 if (parent != null && !(parent instanceof ViewRoot)) { 3475 if ((((View) parent).mPrivateFlags & DIRTY_MASK) == 0) { 3476 result = false; 3477 android.util.Log.d(ViewDebug.CONSISTENCY_LOG_TAG, 3478 "ViewGroup " + this + " is dirty but its parent is not: " + this); 3479 } 3480 } 3481 } 3482 } 3483 3484 return result; 3485 } 3486 3487 /** 3488 * {@inheritDoc} 3489 */ 3490 @Override 3491 protected void debug(int depth) { 3492 super.debug(depth); 3493 String output; 3494 3495 if (mFocused != null) { 3496 output = debugIndent(depth); 3497 output += "mFocused"; 3498 Log.d(VIEW_LOG_TAG, output); 3499 } 3500 if (mChildrenCount != 0) { 3501 output = debugIndent(depth); 3502 output += "{"; 3503 Log.d(VIEW_LOG_TAG, output); 3504 } 3505 int count = mChildrenCount; 3506 for (int i = 0; i < count; i++) { 3507 View child = mChildren[i]; 3508 child.debug(depth + 1); 3509 } 3510 3511 if (mChildrenCount != 0) { 3512 output = debugIndent(depth); 3513 output += "}"; 3514 Log.d(VIEW_LOG_TAG, output); 3515 } 3516 } 3517 3518 /** 3519 * Returns the position in the group of the specified child view. 3520 * 3521 * @param child the view for which to get the position 3522 * @return a positive integer representing the position of the view in the 3523 * group, or -1 if the view does not exist in the group 3524 */ 3525 public int indexOfChild(View child) { 3526 final int count = mChildrenCount; 3527 final View[] children = mChildren; 3528 for (int i = 0; i < count; i++) { 3529 if (children[i] == child) { 3530 return i; 3531 } 3532 } 3533 return -1; 3534 } 3535 3536 /** 3537 * Returns the number of children in the group. 3538 * 3539 * @return a positive integer representing the number of children in 3540 * the group 3541 */ 3542 public int getChildCount() { 3543 return mChildrenCount; 3544 } 3545 3546 /** 3547 * Returns the view at the specified position in the group. 3548 * 3549 * @param index the position at which to get the view from 3550 * @return the view at the specified position or null if the position 3551 * does not exist within the group 3552 */ 3553 public View getChildAt(int index) { 3554 try { 3555 return mChildren[index]; 3556 } catch (IndexOutOfBoundsException ex) { 3557 return null; 3558 } 3559 } 3560 3561 /** 3562 * Ask all of the children of this view to measure themselves, taking into 3563 * account both the MeasureSpec requirements for this view and its padding. 3564 * We skip children that are in the GONE state The heavy lifting is done in 3565 * getChildMeasureSpec. 3566 * 3567 * @param widthMeasureSpec The width requirements for this view 3568 * @param heightMeasureSpec The height requirements for this view 3569 */ 3570 protected void measureChildren(int widthMeasureSpec, int heightMeasureSpec) { 3571 final int size = mChildrenCount; 3572 final View[] children = mChildren; 3573 for (int i = 0; i < size; ++i) { 3574 final View child = children[i]; 3575 if ((child.mViewFlags & VISIBILITY_MASK) != GONE) { 3576 measureChild(child, widthMeasureSpec, heightMeasureSpec); 3577 } 3578 } 3579 } 3580 3581 /** 3582 * Ask one of the children of this view to measure itself, taking into 3583 * account both the MeasureSpec requirements for this view and its padding. 3584 * The heavy lifting is done in getChildMeasureSpec. 3585 * 3586 * @param child The child to measure 3587 * @param parentWidthMeasureSpec The width requirements for this view 3588 * @param parentHeightMeasureSpec The height requirements for this view 3589 */ 3590 protected void measureChild(View child, int parentWidthMeasureSpec, 3591 int parentHeightMeasureSpec) { 3592 final LayoutParams lp = child.getLayoutParams(); 3593 3594 final int childWidthMeasureSpec = getChildMeasureSpec(parentWidthMeasureSpec, 3595 mPaddingLeft + mPaddingRight, lp.width); 3596 final int childHeightMeasureSpec = getChildMeasureSpec(parentHeightMeasureSpec, 3597 mPaddingTop + mPaddingBottom, lp.height); 3598 3599 child.measure(childWidthMeasureSpec, childHeightMeasureSpec); 3600 } 3601 3602 /** 3603 * Ask one of the children of this view to measure itself, taking into 3604 * account both the MeasureSpec requirements for this view and its padding 3605 * and margins. The child must have MarginLayoutParams The heavy lifting is 3606 * done in getChildMeasureSpec. 3607 * 3608 * @param child The child to measure 3609 * @param parentWidthMeasureSpec The width requirements for this view 3610 * @param widthUsed Extra space that has been used up by the parent 3611 * horizontally (possibly by other children of the parent) 3612 * @param parentHeightMeasureSpec The height requirements for this view 3613 * @param heightUsed Extra space that has been used up by the parent 3614 * vertically (possibly by other children of the parent) 3615 */ 3616 protected void measureChildWithMargins(View child, 3617 int parentWidthMeasureSpec, int widthUsed, 3618 int parentHeightMeasureSpec, int heightUsed) { 3619 final MarginLayoutParams lp = (MarginLayoutParams) child.getLayoutParams(); 3620 3621 final int childWidthMeasureSpec = getChildMeasureSpec(parentWidthMeasureSpec, 3622 mPaddingLeft + mPaddingRight + lp.leftMargin + lp.rightMargin 3623 + widthUsed, lp.width); 3624 final int childHeightMeasureSpec = getChildMeasureSpec(parentHeightMeasureSpec, 3625 mPaddingTop + mPaddingBottom + lp.topMargin + lp.bottomMargin 3626 + heightUsed, lp.height); 3627 3628 child.measure(childWidthMeasureSpec, childHeightMeasureSpec); 3629 } 3630 3631 /** 3632 * Does the hard part of measureChildren: figuring out the MeasureSpec to 3633 * pass to a particular child. This method figures out the right MeasureSpec 3634 * for one dimension (height or width) of one child view. 3635 * 3636 * The goal is to combine information from our MeasureSpec with the 3637 * LayoutParams of the child to get the best possible results. For example, 3638 * if the this view knows its size (because its MeasureSpec has a mode of 3639 * EXACTLY), and the child has indicated in its LayoutParams that it wants 3640 * to be the same size as the parent, the parent should ask the child to 3641 * layout given an exact size. 3642 * 3643 * @param spec The requirements for this view 3644 * @param padding The padding of this view for the current dimension and 3645 * margins, if applicable 3646 * @param childDimension How big the child wants to be in the current 3647 * dimension 3648 * @return a MeasureSpec integer for the child 3649 */ 3650 public static int getChildMeasureSpec(int spec, int padding, int childDimension) { 3651 int specMode = MeasureSpec.getMode(spec); 3652 int specSize = MeasureSpec.getSize(spec); 3653 3654 int size = Math.max(0, specSize - padding); 3655 3656 int resultSize = 0; 3657 int resultMode = 0; 3658 3659 switch (specMode) { 3660 // Parent has imposed an exact size on us 3661 case MeasureSpec.EXACTLY: 3662 if (childDimension >= 0) { 3663 resultSize = childDimension; 3664 resultMode = MeasureSpec.EXACTLY; 3665 } else if (childDimension == LayoutParams.MATCH_PARENT) { 3666 // Child wants to be our size. So be it. 3667 resultSize = size; 3668 resultMode = MeasureSpec.EXACTLY; 3669 } else if (childDimension == LayoutParams.WRAP_CONTENT) { 3670 // Child wants to determine its own size. It can't be 3671 // bigger than us. 3672 resultSize = size; 3673 resultMode = MeasureSpec.AT_MOST; 3674 } 3675 break; 3676 3677 // Parent has imposed a maximum size on us 3678 case MeasureSpec.AT_MOST: 3679 if (childDimension >= 0) { 3680 // Child wants a specific size... so be it 3681 resultSize = childDimension; 3682 resultMode = MeasureSpec.EXACTLY; 3683 } else if (childDimension == LayoutParams.MATCH_PARENT) { 3684 // Child wants to be our size, but our size is not fixed. 3685 // Constrain child to not be bigger than us. 3686 resultSize = size; 3687 resultMode = MeasureSpec.AT_MOST; 3688 } else if (childDimension == LayoutParams.WRAP_CONTENT) { 3689 // Child wants to determine its own size. It can't be 3690 // bigger than us. 3691 resultSize = size; 3692 resultMode = MeasureSpec.AT_MOST; 3693 } 3694 break; 3695 3696 // Parent asked to see how big we want to be 3697 case MeasureSpec.UNSPECIFIED: 3698 if (childDimension >= 0) { 3699 // Child wants a specific size... let him have it 3700 resultSize = childDimension; 3701 resultMode = MeasureSpec.EXACTLY; 3702 } else if (childDimension == LayoutParams.MATCH_PARENT) { 3703 // Child wants to be our size... find out how big it should 3704 // be 3705 resultSize = 0; 3706 resultMode = MeasureSpec.UNSPECIFIED; 3707 } else if (childDimension == LayoutParams.WRAP_CONTENT) { 3708 // Child wants to determine its own size.... find out how 3709 // big it should be 3710 resultSize = 0; 3711 resultMode = MeasureSpec.UNSPECIFIED; 3712 } 3713 break; 3714 } 3715 return MeasureSpec.makeMeasureSpec(resultSize, resultMode); 3716 } 3717 3718 3719 /** 3720 * Removes any pending animations for views that have been removed. Call 3721 * this if you don't want animations for exiting views to stack up. 3722 */ 3723 public void clearDisappearingChildren() { 3724 if (mDisappearingChildren != null) { 3725 mDisappearingChildren.clear(); 3726 } 3727 } 3728 3729 /** 3730 * Add a view which is removed from mChildren but still needs animation 3731 * 3732 * @param v View to add 3733 */ 3734 private void addDisappearingView(View v) { 3735 ArrayList<View> disappearingChildren = mDisappearingChildren; 3736 3737 if (disappearingChildren == null) { 3738 disappearingChildren = mDisappearingChildren = new ArrayList<View>(); 3739 } 3740 3741 disappearingChildren.add(v); 3742 } 3743 3744 /** 3745 * Cleanup a view when its animation is done. This may mean removing it from 3746 * the list of disappearing views. 3747 * 3748 * @param view The view whose animation has finished 3749 * @param animation The animation, cannot be null 3750 */ 3751 private void finishAnimatingView(final View view, Animation animation) { 3752 final ArrayList<View> disappearingChildren = mDisappearingChildren; 3753 if (disappearingChildren != null) { 3754 if (disappearingChildren.contains(view)) { 3755 disappearingChildren.remove(view); 3756 3757 if (view.mAttachInfo != null) { 3758 view.dispatchDetachedFromWindow(); 3759 } 3760 3761 view.clearAnimation(); 3762 mGroupFlags |= FLAG_INVALIDATE_REQUIRED; 3763 } 3764 } 3765 3766 if (animation != null && !animation.getFillAfter()) { 3767 view.clearAnimation(); 3768 } 3769 3770 if ((view.mPrivateFlags & ANIMATION_STARTED) == ANIMATION_STARTED) { 3771 view.onAnimationEnd(); 3772 // Should be performed by onAnimationEnd() but this avoid an infinite loop, 3773 // so we'd rather be safe than sorry 3774 view.mPrivateFlags &= ~ANIMATION_STARTED; 3775 // Draw one more frame after the animation is done 3776 mGroupFlags |= FLAG_INVALIDATE_REQUIRED; 3777 } 3778 } 3779 3780 /** 3781 * This method tells the ViewGroup that the given View object, which should have this 3782 * ViewGroup as its parent, 3783 * should be kept around (re-displayed when the ViewGroup draws its children) even if it 3784 * is removed from its parent. This allows animations, such as those used by 3785 * {@link android.app.Fragment} and {@link android.animation.LayoutTransition} to animate 3786 * the removal of views. A call to this method should always be accompanied by a later call 3787 * to {@link #endViewTransition(View)}, such as after an animation on the View has finished, 3788 * so that the View finally gets removed. 3789 * 3790 * @param view The View object to be kept visible even if it gets removed from its parent. 3791 */ 3792 public void startViewTransition(View view) { 3793 if (view.mParent == this) { 3794 if (mTransitioningViews == null) { 3795 mTransitioningViews = new ArrayList<View>(); 3796 } 3797 mTransitioningViews.add(view); 3798 } 3799 } 3800 3801 /** 3802 * This method should always be called following an earlier call to 3803 * {@link #startViewTransition(View)}. The given View is finally removed from its parent 3804 * and will no longer be displayed. Note that this method does not perform the functionality 3805 * of removing a view from its parent; it just discontinues the display of a View that 3806 * has previously been removed. 3807 * 3808 * @return view The View object that has been removed but is being kept around in the visible 3809 * hierarchy by an earlier call to {@link #startViewTransition(View)}. 3810 */ 3811 public void endViewTransition(View view) { 3812 if (mTransitioningViews != null) { 3813 mTransitioningViews.remove(view); 3814 final ArrayList<View> disappearingChildren = mDisappearingChildren; 3815 if (disappearingChildren != null && disappearingChildren.contains(view)) { 3816 disappearingChildren.remove(view); 3817 if (view.mAttachInfo != null) { 3818 view.dispatchDetachedFromWindow(); 3819 } 3820 if (view.mParent != null) { 3821 view.mParent = null; 3822 } 3823 mGroupFlags |= FLAG_INVALIDATE_REQUIRED; 3824 } 3825 } 3826 } 3827 3828 private LayoutTransition.TransitionListener mLayoutTransitionListener = 3829 new LayoutTransition.TransitionListener() { 3830 @Override 3831 public void startTransition(LayoutTransition transition, ViewGroup container, 3832 View view, int transitionType) { 3833 // We only care about disappearing items, since we need special logic to keep 3834 // those items visible after they've been 'removed' 3835 if (transitionType == LayoutTransition.DISAPPEARING) { 3836 startViewTransition(view); 3837 } 3838 } 3839 3840 @Override 3841 public void endTransition(LayoutTransition transition, ViewGroup container, 3842 View view, int transitionType) { 3843 if (transitionType == LayoutTransition.DISAPPEARING && mTransitioningViews != null) { 3844 endViewTransition(view); 3845 } 3846 } 3847 }; 3848 3849 /** 3850 * {@inheritDoc} 3851 */ 3852 @Override 3853 public boolean gatherTransparentRegion(Region region) { 3854 // If no transparent regions requested, we are always opaque. 3855 final boolean meOpaque = (mPrivateFlags & View.REQUEST_TRANSPARENT_REGIONS) == 0; 3856 if (meOpaque && region == null) { 3857 // The caller doesn't care about the region, so stop now. 3858 return true; 3859 } 3860 super.gatherTransparentRegion(region); 3861 final View[] children = mChildren; 3862 final int count = mChildrenCount; 3863 boolean noneOfTheChildrenAreTransparent = true; 3864 for (int i = 0; i < count; i++) { 3865 final View child = children[i]; 3866 if ((child.mViewFlags & VISIBILITY_MASK) != GONE || child.getAnimation() != null) { 3867 if (!child.gatherTransparentRegion(region)) { 3868 noneOfTheChildrenAreTransparent = false; 3869 } 3870 } 3871 } 3872 return meOpaque || noneOfTheChildrenAreTransparent; 3873 } 3874 3875 /** 3876 * {@inheritDoc} 3877 */ 3878 public void requestTransparentRegion(View child) { 3879 if (child != null) { 3880 child.mPrivateFlags |= View.REQUEST_TRANSPARENT_REGIONS; 3881 if (mParent != null) { 3882 mParent.requestTransparentRegion(this); 3883 } 3884 } 3885 } 3886 3887 3888 @Override 3889 protected boolean fitSystemWindows(Rect insets) { 3890 boolean done = super.fitSystemWindows(insets); 3891 if (!done) { 3892 final int count = mChildrenCount; 3893 final View[] children = mChildren; 3894 for (int i = 0; i < count; i++) { 3895 done = children[i].fitSystemWindows(insets); 3896 if (done) { 3897 break; 3898 } 3899 } 3900 } 3901 return done; 3902 } 3903 3904 /** 3905 * Returns the animation listener to which layout animation events are 3906 * sent. 3907 * 3908 * @return an {@link android.view.animation.Animation.AnimationListener} 3909 */ 3910 public Animation.AnimationListener getLayoutAnimationListener() { 3911 return mAnimationListener; 3912 } 3913 3914 @Override 3915 protected void drawableStateChanged() { 3916 super.drawableStateChanged(); 3917 3918 if ((mGroupFlags & FLAG_NOTIFY_CHILDREN_ON_DRAWABLE_STATE_CHANGE) != 0) { 3919 if ((mGroupFlags & FLAG_ADD_STATES_FROM_CHILDREN) != 0) { 3920 throw new IllegalStateException("addStateFromChildren cannot be enabled if a" 3921 + " child has duplicateParentState set to true"); 3922 } 3923 3924 final View[] children = mChildren; 3925 final int count = mChildrenCount; 3926 3927 for (int i = 0; i < count; i++) { 3928 final View child = children[i]; 3929 if ((child.mViewFlags & DUPLICATE_PARENT_STATE) != 0) { 3930 child.refreshDrawableState(); 3931 } 3932 } 3933 } 3934 } 3935 3936 @Override 3937 protected int[] onCreateDrawableState(int extraSpace) { 3938 if ((mGroupFlags & FLAG_ADD_STATES_FROM_CHILDREN) == 0) { 3939 return super.onCreateDrawableState(extraSpace); 3940 } 3941 3942 int need = 0; 3943 int n = getChildCount(); 3944 for (int i = 0; i < n; i++) { 3945 int[] childState = getChildAt(i).getDrawableState(); 3946 3947 if (childState != null) { 3948 need += childState.length; 3949 } 3950 } 3951 3952 int[] state = super.onCreateDrawableState(extraSpace + need); 3953 3954 for (int i = 0; i < n; i++) { 3955 int[] childState = getChildAt(i).getDrawableState(); 3956 3957 if (childState != null) { 3958 state = mergeDrawableStates(state, childState); 3959 } 3960 } 3961 3962 return state; 3963 } 3964 3965 /** 3966 * Sets whether this ViewGroup's drawable states also include 3967 * its children's drawable states. This is used, for example, to 3968 * make a group appear to be focused when its child EditText or button 3969 * is focused. 3970 */ 3971 public void setAddStatesFromChildren(boolean addsStates) { 3972 if (addsStates) { 3973 mGroupFlags |= FLAG_ADD_STATES_FROM_CHILDREN; 3974 } else { 3975 mGroupFlags &= ~FLAG_ADD_STATES_FROM_CHILDREN; 3976 } 3977 3978 refreshDrawableState(); 3979 } 3980 3981 /** 3982 * Returns whether this ViewGroup's drawable states also include 3983 * its children's drawable states. This is used, for example, to 3984 * make a group appear to be focused when its child EditText or button 3985 * is focused. 3986 */ 3987 public boolean addStatesFromChildren() { 3988 return (mGroupFlags & FLAG_ADD_STATES_FROM_CHILDREN) != 0; 3989 } 3990 3991 /** 3992 * If {link #addStatesFromChildren} is true, refreshes this group's 3993 * drawable state (to include the states from its children). 3994 */ 3995 public void childDrawableStateChanged(View child) { 3996 if ((mGroupFlags & FLAG_ADD_STATES_FROM_CHILDREN) != 0) { 3997 refreshDrawableState(); 3998 } 3999 } 4000 4001 /** 4002 * Specifies the animation listener to which layout animation events must 4003 * be sent. Only 4004 * {@link android.view.animation.Animation.AnimationListener#onAnimationStart(Animation)} 4005 * and 4006 * {@link android.view.animation.Animation.AnimationListener#onAnimationEnd(Animation)} 4007 * are invoked. 4008 * 4009 * @param animationListener the layout animation listener 4010 */ 4011 public void setLayoutAnimationListener(Animation.AnimationListener animationListener) { 4012 mAnimationListener = animationListener; 4013 } 4014 4015 /** 4016 * Called when a child's overlay state changes between enabled/disabled. 4017 * @param child Child view whose state has changed or null 4018 * @hide 4019 */ 4020 public void childOverlayStateChanged(View child) { 4021 boolean childHasOverlay = false; 4022 if (child != null) { 4023 childHasOverlay = child.isOverlayEnabled(); 4024 } else { 4025 final int childCount = getChildCount(); 4026 for (int i = 0; i < childCount; i++) { 4027 if (childHasOverlay |= getChildAt(i).isOverlayEnabled()) { 4028 break; 4029 } 4030 } 4031 } 4032 4033 final boolean hasChildWithOverlay = childHasOverlay || 4034 (mGroupFlags & FLAG_CHILD_HAS_OVERLAY) == FLAG_CHILD_HAS_OVERLAY; 4035 4036 final boolean oldValue = isOverlayEnabled(); 4037 mGroupFlags = (mGroupFlags & ~FLAG_CHILD_HAS_OVERLAY) | 4038 (hasChildWithOverlay ? FLAG_CHILD_HAS_OVERLAY : 0); 4039 if (isOverlayEnabled() != oldValue) { 4040 final ViewParent parent = getParent(); 4041 if (parent != null) { 4042 try { 4043 parent.childOverlayStateChanged(this); 4044 } catch (AbstractMethodError e) { 4045 Log.e("ViewGroup", "Could not propagate hasOverlay state", e); 4046 } 4047 } 4048 } 4049 } 4050 4051 /** 4052 * @hide 4053 */ 4054 public boolean isOverlayEnabled() { 4055 return super.isOverlayEnabled() || 4056 ((mGroupFlags & FLAG_CHILD_HAS_OVERLAY) == FLAG_CHILD_HAS_OVERLAY); 4057 } 4058 4059 /** 4060 * @hide 4061 */ 4062 @Override 4063 public void onDrawOverlay(Canvas canvas) { 4064 if ((mGroupFlags & FLAG_CHILD_HAS_OVERLAY) == FLAG_CHILD_HAS_OVERLAY) { 4065 final int childCount = getChildCount(); 4066 for (int i = 0; i < childCount; i++) { 4067 final View child = getChildAt(i); 4068 if (child.isOverlayEnabled()) { 4069 canvas.translate(child.mLeft + child.mScrollX, child.mTop + child.mScrollY); 4070 child.onDrawOverlay(canvas); 4071 canvas.translate(-(child.mLeft + child.mScrollX), 4072 -(child.mTop + child.mScrollY)); 4073 } 4074 } 4075 } 4076 } 4077 4078 /** 4079 * LayoutParams are used by views to tell their parents how they want to be 4080 * laid out. See 4081 * {@link android.R.styleable#ViewGroup_Layout ViewGroup Layout Attributes} 4082 * for a list of all child view attributes that this class supports. 4083 * 4084 * <p> 4085 * The base LayoutParams class just describes how big the view wants to be 4086 * for both width and height. For each dimension, it can specify one of: 4087 * <ul> 4088 * <li>FILL_PARENT (renamed MATCH_PARENT in API Level 8 and higher), which 4089 * means that the view wants to be as big as its parent (minus padding) 4090 * <li> WRAP_CONTENT, which means that the view wants to be just big enough 4091 * to enclose its content (plus padding) 4092 * <li> an exact number 4093 * </ul> 4094 * There are subclasses of LayoutParams for different subclasses of 4095 * ViewGroup. For example, AbsoluteLayout has its own subclass of 4096 * LayoutParams which adds an X and Y value. 4097 * 4098 * @attr ref android.R.styleable#ViewGroup_Layout_layout_height 4099 * @attr ref android.R.styleable#ViewGroup_Layout_layout_width 4100 */ 4101 public static class LayoutParams { 4102 /** 4103 * Special value for the height or width requested by a View. 4104 * FILL_PARENT means that the view wants to be as big as its parent, 4105 * minus the parent's padding, if any. This value is deprecated 4106 * starting in API Level 8 and replaced by {@link #MATCH_PARENT}. 4107 */ 4108 @SuppressWarnings({"UnusedDeclaration"}) 4109 @Deprecated 4110 public static final int FILL_PARENT = -1; 4111 4112 /** 4113 * Special value for the height or width requested by a View. 4114 * MATCH_PARENT means that the view wants to be as big as its parent, 4115 * minus the parent's padding, if any. Introduced in API Level 8. 4116 */ 4117 public static final int MATCH_PARENT = -1; 4118 4119 /** 4120 * Special value for the height or width requested by a View. 4121 * WRAP_CONTENT means that the view wants to be just large enough to fit 4122 * its own internal content, taking its own padding into account. 4123 */ 4124 public static final int WRAP_CONTENT = -2; 4125 4126 /** 4127 * Information about how wide the view wants to be. Can be one of the 4128 * constants FILL_PARENT (replaced by MATCH_PARENT , 4129 * in API Level 8) or WRAP_CONTENT. or an exact size. 4130 */ 4131 @ViewDebug.ExportedProperty(category = "layout", mapping = { 4132 @ViewDebug.IntToString(from = MATCH_PARENT, to = "MATCH_PARENT"), 4133 @ViewDebug.IntToString(from = WRAP_CONTENT, to = "WRAP_CONTENT") 4134 }) 4135 public int width; 4136 4137 /** 4138 * Information about how tall the view wants to be. Can be one of the 4139 * constants FILL_PARENT (replaced by MATCH_PARENT , 4140 * in API Level 8) or WRAP_CONTENT. or an exact size. 4141 */ 4142 @ViewDebug.ExportedProperty(category = "layout", mapping = { 4143 @ViewDebug.IntToString(from = MATCH_PARENT, to = "MATCH_PARENT"), 4144 @ViewDebug.IntToString(from = WRAP_CONTENT, to = "WRAP_CONTENT") 4145 }) 4146 public int height; 4147 4148 /** 4149 * Used to animate layouts. 4150 */ 4151 public LayoutAnimationController.AnimationParameters layoutAnimationParameters; 4152 4153 /** 4154 * Creates a new set of layout parameters. The values are extracted from 4155 * the supplied attributes set and context. The XML attributes mapped 4156 * to this set of layout parameters are: 4157 * 4158 * <ul> 4159 * <li><code>layout_width</code>: the width, either an exact value, 4160 * {@link #WRAP_CONTENT}, or {@link #FILL_PARENT} (replaced by 4161 * {@link #MATCH_PARENT} in API Level 8)</li> 4162 * <li><code>layout_height</code>: the height, either an exact value, 4163 * {@link #WRAP_CONTENT}, or {@link #FILL_PARENT} (replaced by 4164 * {@link #MATCH_PARENT} in API Level 8)</li> 4165 * </ul> 4166 * 4167 * @param c the application environment 4168 * @param attrs the set of attributes from which to extract the layout 4169 * parameters' values 4170 */ 4171 public LayoutParams(Context c, AttributeSet attrs) { 4172 TypedArray a = c.obtainStyledAttributes(attrs, R.styleable.ViewGroup_Layout); 4173 setBaseAttributes(a, 4174 R.styleable.ViewGroup_Layout_layout_width, 4175 R.styleable.ViewGroup_Layout_layout_height); 4176 a.recycle(); 4177 } 4178 4179 /** 4180 * Creates a new set of layout parameters with the specified width 4181 * and height. 4182 * 4183 * @param width the width, either {@link #WRAP_CONTENT}, 4184 * {@link #FILL_PARENT} (replaced by {@link #MATCH_PARENT} in 4185 * API Level 8), or a fixed size in pixels 4186 * @param height the height, either {@link #WRAP_CONTENT}, 4187 * {@link #FILL_PARENT} (replaced by {@link #MATCH_PARENT} in 4188 * API Level 8), or a fixed size in pixels 4189 */ 4190 public LayoutParams(int width, int height) { 4191 this.width = width; 4192 this.height = height; 4193 } 4194 4195 /** 4196 * Copy constructor. Clones the width and height values of the source. 4197 * 4198 * @param source The layout params to copy from. 4199 */ 4200 public LayoutParams(LayoutParams source) { 4201 this.width = source.width; 4202 this.height = source.height; 4203 } 4204 4205 /** 4206 * Used internally by MarginLayoutParams. 4207 * @hide 4208 */ 4209 LayoutParams() { 4210 } 4211 4212 /** 4213 * Extracts the layout parameters from the supplied attributes. 4214 * 4215 * @param a the style attributes to extract the parameters from 4216 * @param widthAttr the identifier of the width attribute 4217 * @param heightAttr the identifier of the height attribute 4218 */ 4219 protected void setBaseAttributes(TypedArray a, int widthAttr, int heightAttr) { 4220 width = a.getLayoutDimension(widthAttr, "layout_width"); 4221 height = a.getLayoutDimension(heightAttr, "layout_height"); 4222 } 4223 4224 /** 4225 * Returns a String representation of this set of layout parameters. 4226 * 4227 * @param output the String to prepend to the internal representation 4228 * @return a String with the following format: output + 4229 * "ViewGroup.LayoutParams={ width=WIDTH, height=HEIGHT }" 4230 * 4231 * @hide 4232 */ 4233 public String debug(String output) { 4234 return output + "ViewGroup.LayoutParams={ width=" 4235 + sizeToString(width) + ", height=" + sizeToString(height) + " }"; 4236 } 4237 4238 /** 4239 * Converts the specified size to a readable String. 4240 * 4241 * @param size the size to convert 4242 * @return a String instance representing the supplied size 4243 * 4244 * @hide 4245 */ 4246 protected static String sizeToString(int size) { 4247 if (size == WRAP_CONTENT) { 4248 return "wrap-content"; 4249 } 4250 if (size == MATCH_PARENT) { 4251 return "match-parent"; 4252 } 4253 return String.valueOf(size); 4254 } 4255 } 4256 4257 /** 4258 * Per-child layout information for layouts that support margins. 4259 * See 4260 * {@link android.R.styleable#ViewGroup_MarginLayout ViewGroup Margin Layout Attributes} 4261 * for a list of all child view attributes that this class supports. 4262 */ 4263 public static class MarginLayoutParams extends ViewGroup.LayoutParams { 4264 /** 4265 * The left margin in pixels of the child. 4266 */ 4267 @ViewDebug.ExportedProperty(category = "layout") 4268 public int leftMargin; 4269 4270 /** 4271 * The top margin in pixels of the child. 4272 */ 4273 @ViewDebug.ExportedProperty(category = "layout") 4274 public int topMargin; 4275 4276 /** 4277 * The right margin in pixels of the child. 4278 */ 4279 @ViewDebug.ExportedProperty(category = "layout") 4280 public int rightMargin; 4281 4282 /** 4283 * The bottom margin in pixels of the child. 4284 */ 4285 @ViewDebug.ExportedProperty(category = "layout") 4286 public int bottomMargin; 4287 4288 /** 4289 * Creates a new set of layout parameters. The values are extracted from 4290 * the supplied attributes set and context. 4291 * 4292 * @param c the application environment 4293 * @param attrs the set of attributes from which to extract the layout 4294 * parameters' values 4295 */ 4296 public MarginLayoutParams(Context c, AttributeSet attrs) { 4297 super(); 4298 4299 TypedArray a = c.obtainStyledAttributes(attrs, R.styleable.ViewGroup_MarginLayout); 4300 setBaseAttributes(a, 4301 R.styleable.ViewGroup_MarginLayout_layout_width, 4302 R.styleable.ViewGroup_MarginLayout_layout_height); 4303 4304 int margin = a.getDimensionPixelSize( 4305 com.android.internal.R.styleable.ViewGroup_MarginLayout_layout_margin, -1); 4306 if (margin >= 0) { 4307 leftMargin = margin; 4308 topMargin = margin; 4309 rightMargin= margin; 4310 bottomMargin = margin; 4311 } else { 4312 leftMargin = a.getDimensionPixelSize( 4313 R.styleable.ViewGroup_MarginLayout_layout_marginLeft, 0); 4314 topMargin = a.getDimensionPixelSize( 4315 R.styleable.ViewGroup_MarginLayout_layout_marginTop, 0); 4316 rightMargin = a.getDimensionPixelSize( 4317 R.styleable.ViewGroup_MarginLayout_layout_marginRight, 0); 4318 bottomMargin = a.getDimensionPixelSize( 4319 R.styleable.ViewGroup_MarginLayout_layout_marginBottom, 0); 4320 } 4321 4322 a.recycle(); 4323 } 4324 4325 /** 4326 * {@inheritDoc} 4327 */ 4328 public MarginLayoutParams(int width, int height) { 4329 super(width, height); 4330 } 4331 4332 /** 4333 * Copy constructor. Clones the width, height and margin values of the source. 4334 * 4335 * @param source The layout params to copy from. 4336 */ 4337 public MarginLayoutParams(MarginLayoutParams source) { 4338 this.width = source.width; 4339 this.height = source.height; 4340 4341 this.leftMargin = source.leftMargin; 4342 this.topMargin = source.topMargin; 4343 this.rightMargin = source.rightMargin; 4344 this.bottomMargin = source.bottomMargin; 4345 } 4346 4347 /** 4348 * {@inheritDoc} 4349 */ 4350 public MarginLayoutParams(LayoutParams source) { 4351 super(source); 4352 } 4353 4354 /** 4355 * Sets the margins, in pixels. 4356 * 4357 * @param left the left margin size 4358 * @param top the top margin size 4359 * @param right the right margin size 4360 * @param bottom the bottom margin size 4361 * 4362 * @attr ref android.R.styleable#ViewGroup_MarginLayout_layout_marginLeft 4363 * @attr ref android.R.styleable#ViewGroup_MarginLayout_layout_marginTop 4364 * @attr ref android.R.styleable#ViewGroup_MarginLayout_layout_marginRight 4365 * @attr ref android.R.styleable#ViewGroup_MarginLayout_layout_marginBottom 4366 */ 4367 public void setMargins(int left, int top, int right, int bottom) { 4368 leftMargin = left; 4369 topMargin = top; 4370 rightMargin = right; 4371 bottomMargin = bottom; 4372 } 4373 } 4374 4375 private static class SplitMotionTargets { 4376 private SparseArray<View> mTargets; 4377 private TargetInfo[] mUniqueTargets; 4378 private int mUniqueTargetCount; 4379 private MotionEvent.PointerCoords[] mPointerCoords; 4380 private int[] mPointerIds; 4381 4382 private static final int INITIAL_UNIQUE_MOTION_TARGETS_SIZE = 5; 4383 private static final int INITIAL_BUCKET_SIZE = 5; 4384 4385 public SplitMotionTargets() { 4386 mTargets = new SparseArray<View>(); 4387 mUniqueTargets = new TargetInfo[INITIAL_UNIQUE_MOTION_TARGETS_SIZE]; 4388 mPointerIds = new int[INITIAL_BUCKET_SIZE]; 4389 mPointerCoords = new MotionEvent.PointerCoords[INITIAL_BUCKET_SIZE]; 4390 for (int i = 0; i < INITIAL_BUCKET_SIZE; i++) { 4391 mPointerCoords[i] = new MotionEvent.PointerCoords(); 4392 } 4393 } 4394 4395 public void clear() { 4396 mTargets.clear(); 4397 final int count = mUniqueTargetCount; 4398 for (int i = 0; i < count; i++) { 4399 mUniqueTargets[i].recycle(); 4400 mUniqueTargets[i] = null; 4401 } 4402 mUniqueTargetCount = 0; 4403 } 4404 4405 public void add(int pointerId, View target, long downTime) { 4406 mTargets.put(pointerId, target); 4407 4408 final int uniqueCount = mUniqueTargetCount; 4409 boolean addUnique = true; 4410 for (int i = 0; i < uniqueCount; i++) { 4411 if (mUniqueTargets[i].view == target) { 4412 addUnique = false; 4413 } 4414 } 4415 if (addUnique) { 4416 if (mUniqueTargets.length == uniqueCount) { 4417 TargetInfo[] newTargets = 4418 new TargetInfo[uniqueCount + INITIAL_UNIQUE_MOTION_TARGETS_SIZE]; 4419 System.arraycopy(mUniqueTargets, 0, newTargets, 0, uniqueCount); 4420 mUniqueTargets = newTargets; 4421 } 4422 mUniqueTargets[uniqueCount] = TargetInfo.obtain(target, downTime); 4423 mUniqueTargetCount++; 4424 } 4425 } 4426 4427 public int getIdCount() { 4428 return mTargets.size(); 4429 } 4430 4431 public int getUniqueTargetCount() { 4432 return mUniqueTargetCount; 4433 } 4434 4435 public TargetInfo getUniqueTargetAt(int index) { 4436 return mUniqueTargets[index]; 4437 } 4438 4439 public View get(int id) { 4440 return mTargets.get(id); 4441 } 4442 4443 public int indexOfTarget(View target) { 4444 return mTargets.indexOfValue(target); 4445 } 4446 4447 public View targetAt(int index) { 4448 return mTargets.valueAt(index); 4449 } 4450 4451 public TargetInfo getPrimaryTarget() { 4452 if (!isEmpty()) { 4453 // Find the longest-lived target 4454 long firstTime = Long.MAX_VALUE; 4455 int firstIndex = 0; 4456 final int uniqueCount = mUniqueTargetCount; 4457 for (int i = 0; i < uniqueCount; i++) { 4458 TargetInfo info = mUniqueTargets[i]; 4459 if (info.downTime < firstTime) { 4460 firstTime = info.downTime; 4461 firstIndex = i; 4462 } 4463 } 4464 return mUniqueTargets[firstIndex]; 4465 } 4466 return null; 4467 } 4468 4469 public boolean isEmpty() { 4470 return mUniqueTargetCount == 0; 4471 } 4472 4473 public void removeById(int id) { 4474 final int index = mTargets.indexOfKey(id); 4475 removeAt(index); 4476 } 4477 4478 public void removeView(View view) { 4479 int i = 0; 4480 while (i < mTargets.size()) { 4481 if (mTargets.valueAt(i) == view) { 4482 mTargets.removeAt(i); 4483 } else { 4484 i++; 4485 } 4486 } 4487 removeUnique(view); 4488 } 4489 4490 public void removeAt(int index) { 4491 if (index < 0 || index >= mTargets.size()) { 4492 return; 4493 } 4494 4495 final View removeView = mTargets.valueAt(index); 4496 mTargets.removeAt(index); 4497 if (mTargets.indexOfValue(removeView) < 0) { 4498 removeUnique(removeView); 4499 } 4500 } 4501 4502 private void removeUnique(View removeView) { 4503 TargetInfo[] unique = mUniqueTargets; 4504 int uniqueCount = mUniqueTargetCount; 4505 for (int i = 0; i < uniqueCount; i++) { 4506 if (unique[i].view == removeView) { 4507 unique[i].recycle(); 4508 unique[i] = unique[--uniqueCount]; 4509 unique[uniqueCount] = null; 4510 break; 4511 } 4512 } 4513 4514 mUniqueTargetCount = uniqueCount; 4515 } 4516 4517 /** 4518 * Return a new (obtain()ed) MotionEvent containing only data for pointers that should 4519 * be dispatched to child. Don't forget to recycle it! 4520 */ 4521 public MotionEvent filterMotionEventForChild(MotionEvent ev, View child, long downTime) { 4522 int action = ev.getAction(); 4523 final int maskedAction = action & MotionEvent.ACTION_MASK; 4524 4525 // Only send pointer up events if this child was the target. Drop it otherwise. 4526 if (maskedAction == MotionEvent.ACTION_POINTER_UP && 4527 get(ev.getPointerId(ev.getActionIndex())) != child) { 4528 return null; 4529 } 4530 4531 int pointerCount = 0; 4532 final int idCount = getIdCount(); 4533 for (int i = 0; i < idCount; i++) { 4534 if (targetAt(i) == child) { 4535 pointerCount++; 4536 } 4537 } 4538 4539 int actionId = -1; 4540 boolean needsNewIndex = false; // True if we should fill in the action's masked index 4541 4542 // If we have a down event, it wasn't counted above. 4543 if (maskedAction == MotionEvent.ACTION_DOWN) { 4544 pointerCount++; 4545 actionId = ev.getPointerId(0); 4546 } else if (maskedAction == MotionEvent.ACTION_POINTER_DOWN) { 4547 pointerCount++; 4548 4549 actionId = ev.getPointerId(ev.getActionIndex()); 4550 4551 if (indexOfTarget(child) < 0) { 4552 // The new action should be ACTION_DOWN if this child isn't currently getting 4553 // any events. 4554 action = MotionEvent.ACTION_DOWN; 4555 } else { 4556 // Fill in the index portion of the action later. 4557 needsNewIndex = true; 4558 } 4559 } else if (maskedAction == MotionEvent.ACTION_POINTER_UP) { 4560 actionId = ev.getPointerId(ev.getActionIndex()); 4561 if (pointerCount == 1) { 4562 // The new action should be ACTION_UP if there's only one pointer left for 4563 // this target. 4564 action = MotionEvent.ACTION_UP; 4565 } else { 4566 // Fill in the index portion of the action later. 4567 needsNewIndex = true; 4568 } 4569 } 4570 4571 if (pointerCount == 0) { 4572 return null; 4573 } 4574 4575 // Fill the buckets with pointer data! 4576 final int eventPointerCount = ev.getPointerCount(); 4577 int bucketIndex = 0; 4578 int newActionIndex = -1; 4579 for (int evp = 0; evp < eventPointerCount; evp++) { 4580 final int id = ev.getPointerId(evp); 4581 4582 // Add this pointer to the bucket if it is new or targeted at child 4583 if (id == actionId || get(id) == child) { 4584 // Expand scratch arrays if needed 4585 if (mPointerCoords.length <= bucketIndex) { 4586 int[] pointerIds = new int[pointerCount]; 4587 MotionEvent.PointerCoords[] pointerCoords = 4588 new MotionEvent.PointerCoords[pointerCount]; 4589 for (int i = mPointerCoords.length; i < pointerCoords.length; i++) { 4590 pointerCoords[i] = new MotionEvent.PointerCoords(); 4591 } 4592 4593 System.arraycopy(mPointerCoords, 0, 4594 pointerCoords, 0, mPointerCoords.length); 4595 System.arraycopy(mPointerIds, 0, pointerIds, 0, mPointerIds.length); 4596 4597 mPointerCoords = pointerCoords; 4598 mPointerIds = pointerIds; 4599 } 4600 4601 mPointerIds[bucketIndex] = id; 4602 ev.getPointerCoords(evp, mPointerCoords[bucketIndex]); 4603 4604 if (needsNewIndex && id == actionId) { 4605 newActionIndex = bucketIndex; 4606 } 4607 4608 bucketIndex++; 4609 } 4610 } 4611 4612 // Encode the new action index if we have one 4613 if (newActionIndex >= 0) { 4614 action = (action & MotionEvent.ACTION_MASK) | 4615 (newActionIndex << MotionEvent.ACTION_POINTER_INDEX_SHIFT); 4616 } 4617 4618 return MotionEvent.obtain(downTime, ev.getEventTime(), 4619 action, pointerCount, mPointerIds, mPointerCoords, ev.getMetaState(), 4620 ev.getXPrecision(), ev.getYPrecision(), ev.getDeviceId(), ev.getEdgeFlags(), 4621 ev.getSource(), ev.getFlags()); 4622 } 4623 4624 static class TargetInfo { 4625 public View view; 4626 public long downTime; 4627 4628 private TargetInfo mNextRecycled; 4629 4630 private static TargetInfo sRecycleBin; 4631 private static int sRecycledCount; 4632 4633 private static int MAX_RECYCLED = 15; 4634 4635 private TargetInfo() { 4636 } 4637 4638 public static TargetInfo obtain(View v, long time) { 4639 TargetInfo info; 4640 if (sRecycleBin == null) { 4641 info = new TargetInfo(); 4642 } else { 4643 info = sRecycleBin; 4644 sRecycleBin = info.mNextRecycled; 4645 sRecycledCount--; 4646 } 4647 info.view = v; 4648 info.downTime = time; 4649 return info; 4650 } 4651 4652 public void recycle() { 4653 if (sRecycledCount >= MAX_RECYCLED) { 4654 return; 4655 } 4656 mNextRecycled = sRecycleBin; 4657 sRecycleBin = this; 4658 sRecycledCount++; 4659 } 4660 } 4661 } 4662} 4663