ViewGroup.java revision b7c25ce3aef3c6e930fc3f31436f52aed8ebed14
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 android.content.Context; 21import android.content.res.Configuration; 22import android.content.res.TypedArray; 23import android.graphics.Bitmap; 24import android.graphics.Canvas; 25import android.graphics.Matrix; 26import android.graphics.Paint; 27import android.graphics.PointF; 28import android.graphics.Rect; 29import android.graphics.RectF; 30import android.graphics.Region; 31import android.os.Build; 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.AlphaAnimation; 39import android.view.animation.Animation; 40import android.view.animation.AnimationUtils; 41import android.view.animation.LayoutAnimationController; 42import android.view.animation.Transformation; 43import com.android.internal.R; 44import com.android.internal.util.Predicate; 45 46import java.util.ArrayList; 47import java.util.HashSet; 48 49/** 50 * <p> 51 * A <code>ViewGroup</code> is a special view that can contain other views 52 * (called children.) The view group is the base class for layouts and views 53 * containers. This class also defines the 54 * {@link android.view.ViewGroup.LayoutParams} class which serves as the base 55 * class for layouts parameters. 56 * </p> 57 * 58 * <p> 59 * Also see {@link LayoutParams} for layout attributes. 60 * </p> 61 * 62 * @attr ref android.R.styleable#ViewGroup_clipChildren 63 * @attr ref android.R.styleable#ViewGroup_clipToPadding 64 * @attr ref android.R.styleable#ViewGroup_layoutAnimation 65 * @attr ref android.R.styleable#ViewGroup_animationCache 66 * @attr ref android.R.styleable#ViewGroup_persistentDrawingCache 67 * @attr ref android.R.styleable#ViewGroup_alwaysDrawnWithCache 68 * @attr ref android.R.styleable#ViewGroup_addStatesFromChildren 69 * @attr ref android.R.styleable#ViewGroup_descendantFocusability 70 * @attr ref android.R.styleable#ViewGroup_animateLayoutChanges 71 */ 72public abstract class ViewGroup extends View implements ViewParent, ViewManager { 73 74 private static final boolean DBG = false; 75 76 /** 77 * Views which have been hidden or removed which need to be animated on 78 * their way out. 79 * This field should be made private, so it is hidden from the SDK. 80 * {@hide} 81 */ 82 protected ArrayList<View> mDisappearingChildren; 83 84 /** 85 * Listener used to propagate events indicating when children are added 86 * and/or removed from a view group. 87 * This field should be made private, so it is hidden from the SDK. 88 * {@hide} 89 */ 90 protected OnHierarchyChangeListener mOnHierarchyChangeListener; 91 92 // The view contained within this ViewGroup that has or contains focus. 93 private View mFocused; 94 95 /** 96 * A Transformation used when drawing children, to 97 * apply on the child being drawn. 98 */ 99 private final Transformation mChildTransformation = new Transformation(); 100 101 /** 102 * Used to track the current invalidation region. 103 */ 104 private RectF mInvalidateRegion; 105 106 /** 107 * A Transformation used to calculate a correct 108 * invalidation area when the application is autoscaled. 109 */ 110 private Transformation mInvalidationTransformation; 111 112 // View currently under an ongoing drag 113 private View mCurrentDragView; 114 115 // Metadata about the ongoing drag 116 private DragEvent mCurrentDrag; 117 private HashSet<View> mDragNotifiedChildren; 118 119 // Does this group have a child that can accept the current drag payload? 120 private boolean mChildAcceptsDrag; 121 122 // Used during drag dispatch 123 private final PointF mLocalPoint = new PointF(); 124 125 // Layout animation 126 private LayoutAnimationController mLayoutAnimationController; 127 private Animation.AnimationListener mAnimationListener; 128 129 // First touch target in the linked list of touch targets. 130 private TouchTarget mFirstTouchTarget; 131 132 // Temporary arrays for splitting pointers. 133 private int[] mTmpPointerIndexMap; 134 private int[] mTmpPointerIds; 135 private MotionEvent.PointerCoords[] mTmpPointerCoords; 136 137 // For debugging only. You can see these in hierarchyviewer. 138 @SuppressWarnings({"FieldCanBeLocal", "UnusedDeclaration"}) 139 @ViewDebug.ExportedProperty(category = "events") 140 private long mLastTouchDownTime; 141 @ViewDebug.ExportedProperty(category = "events") 142 private int mLastTouchDownIndex = -1; 143 @SuppressWarnings({"FieldCanBeLocal", "UnusedDeclaration"}) 144 @ViewDebug.ExportedProperty(category = "events") 145 private float mLastTouchDownX; 146 @SuppressWarnings({"FieldCanBeLocal", "UnusedDeclaration"}) 147 @ViewDebug.ExportedProperty(category = "events") 148 private float mLastTouchDownY; 149 150 // Child which last received ACTION_HOVER_ENTER and ACTION_HOVER_MOVE. 151 private View mHoveredChild; 152 153 /** 154 * Internal flags. 155 * 156 * This field should be made private, so it is hidden from the SDK. 157 * {@hide} 158 */ 159 protected int mGroupFlags; 160 161 // When set, ViewGroup invalidates only the child's rectangle 162 // Set by default 163 private static final int FLAG_CLIP_CHILDREN = 0x1; 164 165 // When set, ViewGroup excludes the padding area from the invalidate rectangle 166 // Set by default 167 private static final int FLAG_CLIP_TO_PADDING = 0x2; 168 169 // When set, dispatchDraw() will invoke invalidate(); this is set by drawChild() when 170 // a child needs to be invalidated and FLAG_OPTIMIZE_INVALIDATE is set 171 private static final int FLAG_INVALIDATE_REQUIRED = 0x4; 172 173 // When set, dispatchDraw() will run the layout animation and unset the flag 174 private static final int FLAG_RUN_ANIMATION = 0x8; 175 176 // When set, there is either no layout animation on the ViewGroup or the layout 177 // animation is over 178 // Set by default 179 private static final int FLAG_ANIMATION_DONE = 0x10; 180 181 // If set, this ViewGroup has padding; if unset there is no padding and we don't need 182 // to clip it, even if FLAG_CLIP_TO_PADDING is set 183 private static final int FLAG_PADDING_NOT_NULL = 0x20; 184 185 // When set, this ViewGroup caches its children in a Bitmap before starting a layout animation 186 // Set by default 187 private static final int FLAG_ANIMATION_CACHE = 0x40; 188 189 // When set, this ViewGroup converts calls to invalidate(Rect) to invalidate() during a 190 // layout animation; this avoid clobbering the hierarchy 191 // Automatically set when the layout animation starts, depending on the animation's 192 // characteristics 193 private static final int FLAG_OPTIMIZE_INVALIDATE = 0x80; 194 195 // When set, the next call to drawChild() will clear mChildTransformation's matrix 196 private static final int FLAG_CLEAR_TRANSFORMATION = 0x100; 197 198 // When set, this ViewGroup invokes mAnimationListener.onAnimationEnd() and removes 199 // the children's Bitmap caches if necessary 200 // This flag is set when the layout animation is over (after FLAG_ANIMATION_DONE is set) 201 private static final int FLAG_NOTIFY_ANIMATION_LISTENER = 0x200; 202 203 /** 204 * When set, the drawing method will call {@link #getChildDrawingOrder(int, int)} 205 * to get the index of the child to draw for that iteration. 206 * 207 * @hide 208 */ 209 protected static final int FLAG_USE_CHILD_DRAWING_ORDER = 0x400; 210 211 /** 212 * When set, this ViewGroup supports static transformations on children; this causes 213 * {@link #getChildStaticTransformation(View, android.view.animation.Transformation)} to be 214 * invoked when a child is drawn. 215 * 216 * Any subclass overriding 217 * {@link #getChildStaticTransformation(View, android.view.animation.Transformation)} should 218 * set this flags in {@link #mGroupFlags}. 219 * 220 * {@hide} 221 */ 222 protected static final int FLAG_SUPPORT_STATIC_TRANSFORMATIONS = 0x800; 223 224 // When the previous drawChild() invocation used an alpha value that was lower than 225 // 1.0 and set it in mCachePaint 226 private static final int FLAG_ALPHA_LOWER_THAN_ONE = 0x1000; 227 228 /** 229 * When set, this ViewGroup's drawable states also include those 230 * of its children. 231 */ 232 private static final int FLAG_ADD_STATES_FROM_CHILDREN = 0x2000; 233 234 /** 235 * When set, this ViewGroup tries to always draw its children using their drawing cache. 236 */ 237 private static final int FLAG_ALWAYS_DRAWN_WITH_CACHE = 0x4000; 238 239 /** 240 * When set, and if FLAG_ALWAYS_DRAWN_WITH_CACHE is not set, this ViewGroup will try to 241 * draw its children with their drawing cache. 242 */ 243 private static final int FLAG_CHILDREN_DRAWN_WITH_CACHE = 0x8000; 244 245 /** 246 * When set, this group will go through its list of children to notify them of 247 * any drawable state change. 248 */ 249 private static final int FLAG_NOTIFY_CHILDREN_ON_DRAWABLE_STATE_CHANGE = 0x10000; 250 251 private static final int FLAG_MASK_FOCUSABILITY = 0x60000; 252 253 /** 254 * This view will get focus before any of its descendants. 255 */ 256 public static final int FOCUS_BEFORE_DESCENDANTS = 0x20000; 257 258 /** 259 * This view will get focus only if none of its descendants want it. 260 */ 261 public static final int FOCUS_AFTER_DESCENDANTS = 0x40000; 262 263 /** 264 * This view will block any of its descendants from getting focus, even 265 * if they are focusable. 266 */ 267 public static final int FOCUS_BLOCK_DESCENDANTS = 0x60000; 268 269 /** 270 * Used to map between enum in attrubutes and flag values. 271 */ 272 private static final int[] DESCENDANT_FOCUSABILITY_FLAGS = 273 {FOCUS_BEFORE_DESCENDANTS, FOCUS_AFTER_DESCENDANTS, 274 FOCUS_BLOCK_DESCENDANTS}; 275 276 /** 277 * When set, this ViewGroup should not intercept touch events. 278 * {@hide} 279 */ 280 protected static final int FLAG_DISALLOW_INTERCEPT = 0x80000; 281 282 /** 283 * When set, this ViewGroup will split MotionEvents to multiple child Views when appropriate. 284 */ 285 private static final int FLAG_SPLIT_MOTION_EVENTS = 0x200000; 286 287 /** 288 * Indicates which types of drawing caches are to be kept in memory. 289 * This field should be made private, so it is hidden from the SDK. 290 * {@hide} 291 */ 292 protected int mPersistentDrawingCache; 293 294 /** 295 * Used to indicate that no drawing cache should be kept in memory. 296 */ 297 public static final int PERSISTENT_NO_CACHE = 0x0; 298 299 /** 300 * Used to indicate that the animation drawing cache should be kept in memory. 301 */ 302 public static final int PERSISTENT_ANIMATION_CACHE = 0x1; 303 304 /** 305 * Used to indicate that the scrolling drawing cache should be kept in memory. 306 */ 307 public static final int PERSISTENT_SCROLLING_CACHE = 0x2; 308 309 /** 310 * Used to indicate that all drawing caches should be kept in memory. 311 */ 312 public static final int PERSISTENT_ALL_CACHES = 0x3; 313 314 /** 315 * We clip to padding when FLAG_CLIP_TO_PADDING and FLAG_PADDING_NOT_NULL 316 * are set at the same time. 317 */ 318 protected static final int CLIP_TO_PADDING_MASK = FLAG_CLIP_TO_PADDING | FLAG_PADDING_NOT_NULL; 319 320 // Index of the child's left position in the mLocation array 321 private static final int CHILD_LEFT_INDEX = 0; 322 // Index of the child's top position in the mLocation array 323 private static final int CHILD_TOP_INDEX = 1; 324 325 // Child views of this ViewGroup 326 private View[] mChildren; 327 // Number of valid children in the mChildren array, the rest should be null or not 328 // considered as children 329 330 private boolean mLayoutSuppressed = false; 331 332 private int mChildrenCount; 333 334 private static final int ARRAY_INITIAL_CAPACITY = 12; 335 private static final int ARRAY_CAPACITY_INCREMENT = 12; 336 337 // Used to draw cached views 338 private final Paint mCachePaint = new Paint(); 339 340 // Used to animate add/remove changes in layout 341 private LayoutTransition mTransition; 342 343 // The set of views that are currently being transitioned. This list is used to track views 344 // being removed that should not actually be removed from the parent yet because they are 345 // being animated. 346 private ArrayList<View> mTransitioningViews; 347 348 // List of children changing visibility. This is used to potentially keep rendering 349 // views during a transition when they otherwise would have become gone/invisible 350 private ArrayList<View> mVisibilityChangingChildren; 351 352 // Indicates whether this container will use its children layers to draw 353 @ViewDebug.ExportedProperty(category = "drawing") 354 private boolean mDrawLayers = true; 355 356 public ViewGroup(Context context) { 357 super(context); 358 initViewGroup(); 359 } 360 361 public ViewGroup(Context context, AttributeSet attrs) { 362 super(context, attrs); 363 initViewGroup(); 364 initFromAttributes(context, attrs); 365 } 366 367 public ViewGroup(Context context, AttributeSet attrs, int defStyle) { 368 super(context, attrs, defStyle); 369 initViewGroup(); 370 initFromAttributes(context, attrs); 371 } 372 373 private void initViewGroup() { 374 // ViewGroup doesn't draw by default 375 setFlags(WILL_NOT_DRAW, DRAW_MASK); 376 mGroupFlags |= FLAG_CLIP_CHILDREN; 377 mGroupFlags |= FLAG_CLIP_TO_PADDING; 378 mGroupFlags |= FLAG_ANIMATION_DONE; 379 mGroupFlags |= FLAG_ANIMATION_CACHE; 380 mGroupFlags |= FLAG_ALWAYS_DRAWN_WITH_CACHE; 381 382 if (mContext.getApplicationInfo().targetSdkVersion >= Build.VERSION_CODES.HONEYCOMB) { 383 mGroupFlags |= FLAG_SPLIT_MOTION_EVENTS; 384 } 385 386 setDescendantFocusability(FOCUS_BEFORE_DESCENDANTS); 387 388 mChildren = new View[ARRAY_INITIAL_CAPACITY]; 389 mChildrenCount = 0; 390 391 mCachePaint.setDither(false); 392 393 mPersistentDrawingCache = PERSISTENT_SCROLLING_CACHE; 394 } 395 396 private void initFromAttributes(Context context, AttributeSet attrs) { 397 TypedArray a = context.obtainStyledAttributes(attrs, 398 R.styleable.ViewGroup); 399 400 final int N = a.getIndexCount(); 401 for (int i = 0; i < N; i++) { 402 int attr = a.getIndex(i); 403 switch (attr) { 404 case R.styleable.ViewGroup_clipChildren: 405 setClipChildren(a.getBoolean(attr, true)); 406 break; 407 case R.styleable.ViewGroup_clipToPadding: 408 setClipToPadding(a.getBoolean(attr, true)); 409 break; 410 case R.styleable.ViewGroup_animationCache: 411 setAnimationCacheEnabled(a.getBoolean(attr, true)); 412 break; 413 case R.styleable.ViewGroup_persistentDrawingCache: 414 setPersistentDrawingCache(a.getInt(attr, PERSISTENT_SCROLLING_CACHE)); 415 break; 416 case R.styleable.ViewGroup_addStatesFromChildren: 417 setAddStatesFromChildren(a.getBoolean(attr, false)); 418 break; 419 case R.styleable.ViewGroup_alwaysDrawnWithCache: 420 setAlwaysDrawnWithCacheEnabled(a.getBoolean(attr, true)); 421 break; 422 case R.styleable.ViewGroup_layoutAnimation: 423 int id = a.getResourceId(attr, -1); 424 if (id > 0) { 425 setLayoutAnimation(AnimationUtils.loadLayoutAnimation(mContext, id)); 426 } 427 break; 428 case R.styleable.ViewGroup_descendantFocusability: 429 setDescendantFocusability(DESCENDANT_FOCUSABILITY_FLAGS[a.getInt(attr, 0)]); 430 break; 431 case R.styleable.ViewGroup_splitMotionEvents: 432 setMotionEventSplittingEnabled(a.getBoolean(attr, false)); 433 break; 434 case R.styleable.ViewGroup_animateLayoutChanges: 435 boolean animateLayoutChanges = a.getBoolean(attr, false); 436 if (animateLayoutChanges) { 437 setLayoutTransition(new LayoutTransition()); 438 } 439 break; 440 } 441 } 442 443 a.recycle(); 444 } 445 446 /** 447 * Gets the descendant focusability of this view group. The descendant 448 * focusability defines the relationship between this view group and its 449 * descendants when looking for a view to take focus in 450 * {@link #requestFocus(int, android.graphics.Rect)}. 451 * 452 * @return one of {@link #FOCUS_BEFORE_DESCENDANTS}, {@link #FOCUS_AFTER_DESCENDANTS}, 453 * {@link #FOCUS_BLOCK_DESCENDANTS}. 454 */ 455 @ViewDebug.ExportedProperty(category = "focus", mapping = { 456 @ViewDebug.IntToString(from = FOCUS_BEFORE_DESCENDANTS, to = "FOCUS_BEFORE_DESCENDANTS"), 457 @ViewDebug.IntToString(from = FOCUS_AFTER_DESCENDANTS, to = "FOCUS_AFTER_DESCENDANTS"), 458 @ViewDebug.IntToString(from = FOCUS_BLOCK_DESCENDANTS, to = "FOCUS_BLOCK_DESCENDANTS") 459 }) 460 public int getDescendantFocusability() { 461 return mGroupFlags & FLAG_MASK_FOCUSABILITY; 462 } 463 464 /** 465 * Set the descendant focusability of this view group. This defines the relationship 466 * between this view group and its descendants when looking for a view to 467 * take focus in {@link #requestFocus(int, android.graphics.Rect)}. 468 * 469 * @param focusability one of {@link #FOCUS_BEFORE_DESCENDANTS}, {@link #FOCUS_AFTER_DESCENDANTS}, 470 * {@link #FOCUS_BLOCK_DESCENDANTS}. 471 */ 472 public void setDescendantFocusability(int focusability) { 473 switch (focusability) { 474 case FOCUS_BEFORE_DESCENDANTS: 475 case FOCUS_AFTER_DESCENDANTS: 476 case FOCUS_BLOCK_DESCENDANTS: 477 break; 478 default: 479 throw new IllegalArgumentException("must be one of FOCUS_BEFORE_DESCENDANTS, " 480 + "FOCUS_AFTER_DESCENDANTS, FOCUS_BLOCK_DESCENDANTS"); 481 } 482 mGroupFlags &= ~FLAG_MASK_FOCUSABILITY; 483 mGroupFlags |= (focusability & FLAG_MASK_FOCUSABILITY); 484 } 485 486 /** 487 * {@inheritDoc} 488 */ 489 @Override 490 void handleFocusGainInternal(int direction, Rect previouslyFocusedRect) { 491 if (mFocused != null) { 492 mFocused.unFocus(); 493 mFocused = null; 494 } 495 super.handleFocusGainInternal(direction, previouslyFocusedRect); 496 } 497 498 /** 499 * {@inheritDoc} 500 */ 501 public void requestChildFocus(View child, View focused) { 502 if (DBG) { 503 System.out.println(this + " requestChildFocus()"); 504 } 505 if (getDescendantFocusability() == FOCUS_BLOCK_DESCENDANTS) { 506 return; 507 } 508 509 // Unfocus us, if necessary 510 super.unFocus(); 511 512 // We had a previous notion of who had focus. Clear it. 513 if (mFocused != child) { 514 if (mFocused != null) { 515 mFocused.unFocus(); 516 } 517 518 mFocused = child; 519 } 520 if (mParent != null) { 521 mParent.requestChildFocus(this, focused); 522 } 523 } 524 525 /** 526 * {@inheritDoc} 527 */ 528 public void focusableViewAvailable(View v) { 529 if (mParent != null 530 // shortcut: don't report a new focusable view if we block our descendants from 531 // getting focus 532 && (getDescendantFocusability() != FOCUS_BLOCK_DESCENDANTS) 533 // shortcut: don't report a new focusable view if we already are focused 534 // (and we don't prefer our descendants) 535 // 536 // note: knowing that mFocused is non-null is not a good enough reason 537 // to break the traversal since in that case we'd actually have to find 538 // the focused view and make sure it wasn't FOCUS_AFTER_DESCENDANTS and 539 // an ancestor of v; this will get checked for at ViewRoot 540 && !(isFocused() && getDescendantFocusability() != FOCUS_AFTER_DESCENDANTS)) { 541 mParent.focusableViewAvailable(v); 542 } 543 } 544 545 /** 546 * {@inheritDoc} 547 */ 548 public boolean showContextMenuForChild(View originalView) { 549 return mParent != null && mParent.showContextMenuForChild(originalView); 550 } 551 552 /** 553 * {@inheritDoc} 554 */ 555 public ActionMode startActionModeForChild(View originalView, ActionMode.Callback callback) { 556 return mParent != null ? mParent.startActionModeForChild(originalView, callback) : null; 557 } 558 559 /** 560 * Find the nearest view in the specified direction that wants to take 561 * focus. 562 * 563 * @param focused The view that currently has focus 564 * @param direction One of FOCUS_UP, FOCUS_DOWN, FOCUS_LEFT, and 565 * FOCUS_RIGHT, or 0 for not applicable. 566 */ 567 public View focusSearch(View focused, int direction) { 568 if (isRootNamespace()) { 569 // root namespace means we should consider ourselves the top of the 570 // tree for focus searching; otherwise we could be focus searching 571 // into other tabs. see LocalActivityManager and TabHost for more info 572 return FocusFinder.getInstance().findNextFocus(this, focused, direction); 573 } else if (mParent != null) { 574 return mParent.focusSearch(focused, direction); 575 } 576 return null; 577 } 578 579 /** 580 * {@inheritDoc} 581 */ 582 public boolean requestChildRectangleOnScreen(View child, Rect rectangle, boolean immediate) { 583 return false; 584 } 585 586 /** 587 * {@inheritDoc} 588 */ 589 @Override 590 public boolean dispatchUnhandledMove(View focused, int direction) { 591 return mFocused != null && 592 mFocused.dispatchUnhandledMove(focused, direction); 593 } 594 595 /** 596 * {@inheritDoc} 597 */ 598 public void clearChildFocus(View child) { 599 if (DBG) { 600 System.out.println(this + " clearChildFocus()"); 601 } 602 603 mFocused = null; 604 if (mParent != null) { 605 mParent.clearChildFocus(this); 606 } 607 } 608 609 /** 610 * {@inheritDoc} 611 */ 612 @Override 613 public void clearFocus() { 614 super.clearFocus(); 615 616 // clear any child focus if it exists 617 if (mFocused != null) { 618 mFocused.clearFocus(); 619 } 620 } 621 622 /** 623 * {@inheritDoc} 624 */ 625 @Override 626 void unFocus() { 627 if (DBG) { 628 System.out.println(this + " unFocus()"); 629 } 630 631 super.unFocus(); 632 if (mFocused != null) { 633 mFocused.unFocus(); 634 } 635 mFocused = null; 636 } 637 638 /** 639 * Returns the focused child of this view, if any. The child may have focus 640 * or contain focus. 641 * 642 * @return the focused child or null. 643 */ 644 public View getFocusedChild() { 645 return mFocused; 646 } 647 648 /** 649 * Returns true if this view has or contains focus 650 * 651 * @return true if this view has or contains focus 652 */ 653 @Override 654 public boolean hasFocus() { 655 return (mPrivateFlags & FOCUSED) != 0 || mFocused != null; 656 } 657 658 /* 659 * (non-Javadoc) 660 * 661 * @see android.view.View#findFocus() 662 */ 663 @Override 664 public View findFocus() { 665 if (DBG) { 666 System.out.println("Find focus in " + this + ": flags=" 667 + isFocused() + ", child=" + mFocused); 668 } 669 670 if (isFocused()) { 671 return this; 672 } 673 674 if (mFocused != null) { 675 return mFocused.findFocus(); 676 } 677 return null; 678 } 679 680 /** 681 * {@inheritDoc} 682 */ 683 @Override 684 public boolean hasFocusable() { 685 if ((mViewFlags & VISIBILITY_MASK) != VISIBLE) { 686 return false; 687 } 688 689 if (isFocusable()) { 690 return true; 691 } 692 693 final int descendantFocusability = getDescendantFocusability(); 694 if (descendantFocusability != FOCUS_BLOCK_DESCENDANTS) { 695 final int count = mChildrenCount; 696 final View[] children = mChildren; 697 698 for (int i = 0; i < count; i++) { 699 final View child = children[i]; 700 if (child.hasFocusable()) { 701 return true; 702 } 703 } 704 } 705 706 return false; 707 } 708 709 /** 710 * {@inheritDoc} 711 */ 712 @Override 713 public void addFocusables(ArrayList<View> views, int direction) { 714 addFocusables(views, direction, FOCUSABLES_TOUCH_MODE); 715 } 716 717 /** 718 * {@inheritDoc} 719 */ 720 @Override 721 public void addFocusables(ArrayList<View> views, int direction, int focusableMode) { 722 final int focusableCount = views.size(); 723 724 final int descendantFocusability = getDescendantFocusability(); 725 726 if (descendantFocusability != FOCUS_BLOCK_DESCENDANTS) { 727 final int count = mChildrenCount; 728 final View[] children = mChildren; 729 730 for (int i = 0; i < count; i++) { 731 final View child = children[i]; 732 if ((child.mViewFlags & VISIBILITY_MASK) == VISIBLE) { 733 child.addFocusables(views, direction, focusableMode); 734 } 735 } 736 } 737 738 // we add ourselves (if focusable) in all cases except for when we are 739 // FOCUS_AFTER_DESCENDANTS and there are some descendants focusable. this is 740 // to avoid the focus search finding layouts when a more precise search 741 // among the focusable children would be more interesting. 742 if ( 743 descendantFocusability != FOCUS_AFTER_DESCENDANTS || 744 // No focusable descendants 745 (focusableCount == views.size())) { 746 super.addFocusables(views, direction, focusableMode); 747 } 748 } 749 750 /** 751 * {@inheritDoc} 752 */ 753 @Override 754 public void dispatchWindowFocusChanged(boolean hasFocus) { 755 super.dispatchWindowFocusChanged(hasFocus); 756 final int count = mChildrenCount; 757 final View[] children = mChildren; 758 for (int i = 0; i < count; i++) { 759 children[i].dispatchWindowFocusChanged(hasFocus); 760 } 761 } 762 763 /** 764 * {@inheritDoc} 765 */ 766 @Override 767 public void addTouchables(ArrayList<View> views) { 768 super.addTouchables(views); 769 770 final int count = mChildrenCount; 771 final View[] children = mChildren; 772 773 for (int i = 0; i < count; i++) { 774 final View child = children[i]; 775 if ((child.mViewFlags & VISIBILITY_MASK) == VISIBLE) { 776 child.addTouchables(views); 777 } 778 } 779 } 780 781 /** 782 * {@inheritDoc} 783 */ 784 @Override 785 public void dispatchDisplayHint(int hint) { 786 super.dispatchDisplayHint(hint); 787 final int count = mChildrenCount; 788 final View[] children = mChildren; 789 for (int i = 0; i < count; i++) { 790 children[i].dispatchDisplayHint(hint); 791 } 792 } 793 794 /** 795 * @hide 796 * @param child 797 * @param visibility 798 */ 799 void onChildVisibilityChanged(View child, int visibility) { 800 if (mTransition != null) { 801 if (visibility == VISIBLE) { 802 mTransition.showChild(this, child); 803 } else { 804 mTransition.hideChild(this, child); 805 } 806 if (visibility != VISIBLE) { 807 // Only track this on disappearing views - appearing views are already visible 808 // and don't need special handling during drawChild() 809 if (mVisibilityChangingChildren == null) { 810 mVisibilityChangingChildren = new ArrayList<View>(); 811 } 812 mVisibilityChangingChildren.add(child); 813 if (mTransitioningViews != null && mTransitioningViews.contains(child)) { 814 addDisappearingView(child); 815 } 816 } 817 } 818 819 // in all cases, for drags 820 if (mCurrentDrag != null) { 821 if (visibility == VISIBLE) { 822 notifyChildOfDrag(child); 823 } 824 } 825 } 826 827 /** 828 * {@inheritDoc} 829 */ 830 @Override 831 protected void dispatchVisibilityChanged(View changedView, int visibility) { 832 super.dispatchVisibilityChanged(changedView, visibility); 833 final int count = mChildrenCount; 834 final View[] children = mChildren; 835 for (int i = 0; i < count; i++) { 836 children[i].dispatchVisibilityChanged(changedView, visibility); 837 } 838 } 839 840 /** 841 * {@inheritDoc} 842 */ 843 @Override 844 public void dispatchWindowVisibilityChanged(int visibility) { 845 super.dispatchWindowVisibilityChanged(visibility); 846 final int count = mChildrenCount; 847 final View[] children = mChildren; 848 for (int i = 0; i < count; i++) { 849 children[i].dispatchWindowVisibilityChanged(visibility); 850 } 851 } 852 853 /** 854 * {@inheritDoc} 855 */ 856 @Override 857 public void dispatchConfigurationChanged(Configuration newConfig) { 858 super.dispatchConfigurationChanged(newConfig); 859 final int count = mChildrenCount; 860 final View[] children = mChildren; 861 for (int i = 0; i < count; i++) { 862 children[i].dispatchConfigurationChanged(newConfig); 863 } 864 } 865 866 /** 867 * {@inheritDoc} 868 */ 869 public void recomputeViewAttributes(View child) { 870 if (mAttachInfo != null && !mAttachInfo.mRecomputeGlobalAttributes) { 871 ViewParent parent = mParent; 872 if (parent != null) parent.recomputeViewAttributes(this); 873 } 874 } 875 876 @Override 877 void dispatchCollectViewAttributes(int visibility) { 878 visibility |= mViewFlags&VISIBILITY_MASK; 879 super.dispatchCollectViewAttributes(visibility); 880 final int count = mChildrenCount; 881 final View[] children = mChildren; 882 for (int i = 0; i < count; i++) { 883 children[i].dispatchCollectViewAttributes(visibility); 884 } 885 } 886 887 /** 888 * {@inheritDoc} 889 */ 890 public void bringChildToFront(View child) { 891 int index = indexOfChild(child); 892 if (index >= 0) { 893 removeFromArray(index); 894 addInArray(child, mChildrenCount); 895 child.mParent = this; 896 } 897 } 898 899 /** 900 * {@inheritDoc} 901 * 902 * !!! TODO: write real docs 903 */ 904 @Override 905 public boolean dispatchDragEvent(DragEvent event) { 906 boolean retval = false; 907 final float tx = event.mX; 908 final float ty = event.mY; 909 910 ViewRoot root = getViewRoot(); 911 912 // Dispatch down the view hierarchy 913 switch (event.mAction) { 914 case DragEvent.ACTION_DRAG_STARTED: { 915 // clear state to recalculate which views we drag over 916 mCurrentDragView = null; 917 918 // Set up our tracking of drag-started notifications 919 mCurrentDrag = DragEvent.obtain(event); 920 if (mDragNotifiedChildren == null) { 921 mDragNotifiedChildren = new HashSet<View>(); 922 } else { 923 mDragNotifiedChildren.clear(); 924 } 925 926 // Now dispatch down to our children, caching the responses 927 mChildAcceptsDrag = false; 928 final int count = mChildrenCount; 929 final View[] children = mChildren; 930 for (int i = 0; i < count; i++) { 931 final View child = children[i]; 932 if (child.getVisibility() == VISIBLE) { 933 final boolean handled = notifyChildOfDrag(children[i]); 934 if (handled) { 935 mChildAcceptsDrag = true; 936 } 937 } 938 } 939 940 // Return HANDLED if one of our children can accept the drag 941 if (mChildAcceptsDrag) { 942 retval = true; 943 } 944 } break; 945 946 case DragEvent.ACTION_DRAG_ENDED: { 947 // Release the bookkeeping now that the drag lifecycle has ended 948 if (mDragNotifiedChildren != null) { 949 for (View child : mDragNotifiedChildren) { 950 // If a child was notified about an ongoing drag, it's told that it's over 951 child.dispatchDragEvent(event); 952 } 953 954 mDragNotifiedChildren.clear(); 955 mCurrentDrag.recycle(); 956 mCurrentDrag = null; 957 } 958 959 // We consider drag-ended to have been handled if one of our children 960 // had offered to handle the drag. 961 if (mChildAcceptsDrag) { 962 retval = true; 963 } 964 } break; 965 966 case DragEvent.ACTION_DRAG_LOCATION: { 967 // Find the [possibly new] drag target 968 final View target = findFrontmostDroppableChildAt(event.mX, event.mY, mLocalPoint); 969 970 // If we've changed apparent drag target, tell the view root which view 971 // we're over now [for purposes of the eventual drag-recipient-changed 972 // notifications to the framework] and tell the new target that the drag 973 // has entered its bounds. The root will see setDragFocus() calls all 974 // the way down to the final leaf view that is handling the LOCATION event 975 // before reporting the new potential recipient to the framework. 976 if (mCurrentDragView != target) { 977 root.setDragFocus(target); 978 979 final int action = event.mAction; 980 // If we've dragged off of a child view, send it the EXITED message 981 if (mCurrentDragView != null) { 982 event.mAction = DragEvent.ACTION_DRAG_EXITED; 983 mCurrentDragView.dispatchDragEvent(event); 984 } 985 mCurrentDragView = target; 986 987 // If we've dragged over a new child view, send it the ENTERED message 988 if (target != null) { 989 event.mAction = DragEvent.ACTION_DRAG_ENTERED; 990 target.dispatchDragEvent(event); 991 } 992 event.mAction = action; // restore the event's original state 993 } 994 995 // Dispatch the actual drag location notice, localized into its coordinates 996 if (target != null) { 997 event.mX = mLocalPoint.x; 998 event.mY = mLocalPoint.y; 999 1000 retval = target.dispatchDragEvent(event); 1001 1002 event.mX = tx; 1003 event.mY = ty; 1004 } 1005 } break; 1006 1007 /* Entered / exited dispatch 1008 * 1009 * DRAG_ENTERED is not dispatched downwards from ViewGroup. The reason for this is 1010 * that we're about to get the corresponding LOCATION event, which we will use to 1011 * determine which of our children is the new target; at that point we will 1012 * push a DRAG_ENTERED down to the new target child [which may itself be a ViewGroup]. 1013 * 1014 * DRAG_EXITED *is* dispatched all the way down immediately: once we know the 1015 * drag has left this ViewGroup, we know by definition that every contained subview 1016 * is also no longer under the drag point. 1017 */ 1018 1019 case DragEvent.ACTION_DRAG_EXITED: { 1020 if (mCurrentDragView != null) { 1021 mCurrentDragView.dispatchDragEvent(event); 1022 mCurrentDragView = null; 1023 } 1024 } break; 1025 1026 case DragEvent.ACTION_DROP: { 1027 if (ViewDebug.DEBUG_DRAG) Log.d(View.VIEW_LOG_TAG, "Drop event: " + event); 1028 View target = findFrontmostDroppableChildAt(event.mX, event.mY, mLocalPoint); 1029 if (target != null) { 1030 if (ViewDebug.DEBUG_DRAG) Log.d(View.VIEW_LOG_TAG, " dispatch drop to " + target); 1031 event.mX = mLocalPoint.x; 1032 event.mY = mLocalPoint.y; 1033 retval = target.dispatchDragEvent(event); 1034 event.mX = tx; 1035 event.mY = ty; 1036 } else { 1037 if (ViewDebug.DEBUG_DRAG) { 1038 Log.d(View.VIEW_LOG_TAG, " not dropped on an accepting view"); 1039 } 1040 } 1041 } break; 1042 } 1043 1044 // If none of our children could handle the event, try here 1045 if (!retval) { 1046 // Call up to the View implementation that dispatches to installed listeners 1047 retval = super.dispatchDragEvent(event); 1048 } 1049 return retval; 1050 } 1051 1052 // Find the frontmost child view that lies under the given point, and calculate 1053 // the position within its own local coordinate system. 1054 View findFrontmostDroppableChildAt(float x, float y, PointF outLocalPoint) { 1055 final int count = mChildrenCount; 1056 final View[] children = mChildren; 1057 for (int i = count - 1; i >= 0; i--) { 1058 final View child = children[i]; 1059 if (!child.mCanAcceptDrop) { 1060 continue; 1061 } 1062 1063 if (isTransformedTouchPointInView(x, y, child, outLocalPoint)) { 1064 return child; 1065 } 1066 } 1067 return null; 1068 } 1069 1070 boolean notifyChildOfDrag(View child) { 1071 if (ViewDebug.DEBUG_DRAG) { 1072 Log.d(View.VIEW_LOG_TAG, "Sending drag-started to view: " + child); 1073 } 1074 1075 if (! mDragNotifiedChildren.contains(child)) { 1076 mDragNotifiedChildren.add(child); 1077 child.mCanAcceptDrop = child.dispatchDragEvent(mCurrentDrag); 1078 } 1079 return child.mCanAcceptDrop; 1080 } 1081 1082 @Override 1083 public void dispatchSystemUiVisibilityChanged(int visible) { 1084 super.dispatchSystemUiVisibilityChanged(visible); 1085 1086 final int count = mChildrenCount; 1087 final View[] children = mChildren; 1088 for (int i=0; i <count; i++) { 1089 final View child = children[i]; 1090 child.dispatchSystemUiVisibilityChanged(visible); 1091 } 1092 } 1093 1094 /** 1095 * {@inheritDoc} 1096 */ 1097 @Override 1098 public boolean dispatchKeyEventPreIme(KeyEvent event) { 1099 if ((mPrivateFlags & (FOCUSED | HAS_BOUNDS)) == (FOCUSED | HAS_BOUNDS)) { 1100 return super.dispatchKeyEventPreIme(event); 1101 } else if (mFocused != null && (mFocused.mPrivateFlags & HAS_BOUNDS) == HAS_BOUNDS) { 1102 return mFocused.dispatchKeyEventPreIme(event); 1103 } 1104 return false; 1105 } 1106 1107 /** 1108 * {@inheritDoc} 1109 */ 1110 @Override 1111 public boolean dispatchKeyEvent(KeyEvent event) { 1112 if ((mPrivateFlags & (FOCUSED | HAS_BOUNDS)) == (FOCUSED | HAS_BOUNDS)) { 1113 return super.dispatchKeyEvent(event); 1114 } else if (mFocused != null && (mFocused.mPrivateFlags & HAS_BOUNDS) == HAS_BOUNDS) { 1115 return mFocused.dispatchKeyEvent(event); 1116 } 1117 return false; 1118 } 1119 1120 /** 1121 * {@inheritDoc} 1122 */ 1123 @Override 1124 public boolean dispatchKeyShortcutEvent(KeyEvent event) { 1125 if ((mPrivateFlags & (FOCUSED | HAS_BOUNDS)) == (FOCUSED | HAS_BOUNDS)) { 1126 return super.dispatchKeyShortcutEvent(event); 1127 } else if (mFocused != null && (mFocused.mPrivateFlags & HAS_BOUNDS) == HAS_BOUNDS) { 1128 return mFocused.dispatchKeyShortcutEvent(event); 1129 } 1130 return false; 1131 } 1132 1133 /** 1134 * {@inheritDoc} 1135 */ 1136 @Override 1137 public boolean dispatchTrackballEvent(MotionEvent event) { 1138 if ((mPrivateFlags & (FOCUSED | HAS_BOUNDS)) == (FOCUSED | HAS_BOUNDS)) { 1139 return super.dispatchTrackballEvent(event); 1140 } else if (mFocused != null && (mFocused.mPrivateFlags & HAS_BOUNDS) == HAS_BOUNDS) { 1141 return mFocused.dispatchTrackballEvent(event); 1142 } 1143 return false; 1144 } 1145 1146 /** @hide */ 1147 @Override 1148 protected boolean dispatchHoverEvent(MotionEvent event) { 1149 // Send the hover enter or hover move event to the view group first. 1150 // If it handles the event then a hovered child should receive hover exit. 1151 boolean handled = false; 1152 final boolean interceptHover; 1153 final int action = event.getAction(); 1154 if (action == MotionEvent.ACTION_HOVER_EXIT) { 1155 interceptHover = true; 1156 } else { 1157 handled = super.dispatchHoverEvent(event); 1158 interceptHover = handled; 1159 } 1160 1161 // Send successive hover events to the hovered child as long as the pointer 1162 // remains within the child's bounds. 1163 MotionEvent eventNoHistory = event; 1164 if (mHoveredChild != null) { 1165 final float x = event.getX(); 1166 final float y = event.getY(); 1167 1168 if (interceptHover 1169 || !isTransformedTouchPointInView(x, y, mHoveredChild, null)) { 1170 // Pointer exited the child. 1171 // Send it a hover exit with only the most recent coordinates. We could 1172 // try to find the exact point in history when the pointer left the view 1173 // but it is not worth the effort. 1174 eventNoHistory = obtainMotionEventNoHistoryOrSelf(eventNoHistory); 1175 eventNoHistory.setAction(MotionEvent.ACTION_HOVER_EXIT); 1176 handled |= dispatchTransformedGenericPointerEvent(eventNoHistory, mHoveredChild); 1177 eventNoHistory.setAction(action); 1178 1179 mHoveredChild = null; 1180 } else if (action == MotionEvent.ACTION_HOVER_MOVE) { 1181 // Pointer is still within the child. 1182 handled |= dispatchTransformedGenericPointerEvent(event, mHoveredChild); 1183 } 1184 } 1185 1186 // Find a new hovered child if needed. 1187 if (!interceptHover && mHoveredChild == null 1188 && (action == MotionEvent.ACTION_HOVER_ENTER 1189 || action == MotionEvent.ACTION_HOVER_MOVE)) { 1190 final int childrenCount = mChildrenCount; 1191 if (childrenCount != 0) { 1192 final View[] children = mChildren; 1193 final float x = event.getX(); 1194 final float y = event.getY(); 1195 1196 for (int i = childrenCount - 1; i >= 0; i--) { 1197 final View child = children[i]; 1198 if (!canViewReceivePointerEvents(child) 1199 || !isTransformedTouchPointInView(x, y, child, null)) { 1200 continue; 1201 } 1202 1203 // Found the hovered child. 1204 mHoveredChild = child; 1205 if (action == MotionEvent.ACTION_HOVER_MOVE) { 1206 // Pointer was moving within the view group and entered the child. 1207 // Send it a hover enter and hover move with only the most recent 1208 // coordinates. We could try to find the exact point in history when 1209 // the pointer entered the view but it is not worth the effort. 1210 eventNoHistory = obtainMotionEventNoHistoryOrSelf(eventNoHistory); 1211 eventNoHistory.setAction(MotionEvent.ACTION_HOVER_ENTER); 1212 handled |= dispatchTransformedGenericPointerEvent(eventNoHistory, child); 1213 eventNoHistory.setAction(action); 1214 1215 handled |= dispatchTransformedGenericPointerEvent(eventNoHistory, child); 1216 } else { /* must be ACTION_HOVER_ENTER */ 1217 // Pointer entered the child. 1218 handled |= dispatchTransformedGenericPointerEvent(event, child); 1219 } 1220 break; 1221 } 1222 } 1223 } 1224 1225 // Recycle the copy of the event that we made. 1226 if (eventNoHistory != event) { 1227 eventNoHistory.recycle(); 1228 } 1229 1230 // Send hover exit to the view group. If there was a child, we will already have 1231 // sent the hover exit to it. 1232 if (action == MotionEvent.ACTION_HOVER_EXIT) { 1233 handled |= super.dispatchHoverEvent(event); 1234 } 1235 1236 // Done. 1237 return handled; 1238 } 1239 1240 private static MotionEvent obtainMotionEventNoHistoryOrSelf(MotionEvent event) { 1241 if (event.getHistorySize() == 0) { 1242 return event; 1243 } 1244 return MotionEvent.obtainNoHistory(event); 1245 } 1246 1247 /** @hide */ 1248 @Override 1249 protected boolean dispatchGenericPointerEvent(MotionEvent event) { 1250 // Send the event to the child under the pointer. 1251 final int childrenCount = mChildrenCount; 1252 if (childrenCount != 0) { 1253 final View[] children = mChildren; 1254 final float x = event.getX(); 1255 final float y = event.getY(); 1256 1257 for (int i = childrenCount - 1; i >= 0; i--) { 1258 final View child = children[i]; 1259 if (!canViewReceivePointerEvents(child) 1260 || !isTransformedTouchPointInView(x, y, child, null)) { 1261 continue; 1262 } 1263 1264 if (dispatchTransformedGenericPointerEvent(event, child)) { 1265 return true; 1266 } 1267 } 1268 } 1269 1270 // No child handled the event. Send it to this view group. 1271 return super.dispatchGenericPointerEvent(event); 1272 } 1273 1274 /** @hide */ 1275 @Override 1276 protected boolean dispatchGenericFocusedEvent(MotionEvent event) { 1277 // Send the event to the focused child or to this view group if it has focus. 1278 if ((mPrivateFlags & (FOCUSED | HAS_BOUNDS)) == (FOCUSED | HAS_BOUNDS)) { 1279 return super.dispatchGenericFocusedEvent(event); 1280 } else if (mFocused != null && (mFocused.mPrivateFlags & HAS_BOUNDS) == HAS_BOUNDS) { 1281 return mFocused.dispatchGenericMotionEvent(event); 1282 } 1283 return false; 1284 } 1285 1286 /** 1287 * Dispatches a generic pointer event to a child, taking into account 1288 * transformations that apply to the child. 1289 * 1290 * @param event The event to send. 1291 * @param child The view to send the event to. 1292 * @return {@code true} if the child handled the event. 1293 */ 1294 private boolean dispatchTransformedGenericPointerEvent(MotionEvent event, View child) { 1295 final float offsetX = mScrollX - child.mLeft; 1296 final float offsetY = mScrollY - child.mTop; 1297 1298 boolean handled; 1299 if (!child.hasIdentityMatrix()) { 1300 MotionEvent transformedEvent = MotionEvent.obtain(event); 1301 transformedEvent.offsetLocation(offsetX, offsetY); 1302 transformedEvent.transform(child.getInverseMatrix()); 1303 handled = child.dispatchGenericMotionEvent(transformedEvent); 1304 transformedEvent.recycle(); 1305 } else { 1306 event.offsetLocation(offsetX, offsetY); 1307 handled = child.dispatchGenericMotionEvent(event); 1308 event.offsetLocation(-offsetX, -offsetY); 1309 } 1310 return handled; 1311 } 1312 1313 /** 1314 * {@inheritDoc} 1315 */ 1316 @Override 1317 public boolean dispatchTouchEvent(MotionEvent ev) { 1318 if (!onFilterTouchEventForSecurity(ev)) { 1319 return false; 1320 } 1321 1322 final int action = ev.getAction(); 1323 final int actionMasked = action & MotionEvent.ACTION_MASK; 1324 1325 // Handle an initial down. 1326 if (actionMasked == MotionEvent.ACTION_DOWN) { 1327 // Throw away all previous state when starting a new touch gesture. 1328 // The framework may have dropped the up or cancel event for the previous gesture 1329 // due to an app switch, ANR, or some other state change. 1330 cancelAndClearTouchTargets(ev); 1331 resetTouchState(); 1332 } 1333 1334 // Check for interception. 1335 final boolean intercepted; 1336 if (actionMasked == MotionEvent.ACTION_DOWN 1337 || mFirstTouchTarget != null) { 1338 final boolean disallowIntercept = (mGroupFlags & FLAG_DISALLOW_INTERCEPT) != 0; 1339 if (!disallowIntercept) { 1340 intercepted = onInterceptTouchEvent(ev); 1341 ev.setAction(action); // restore action in case onInterceptTouchEvent() changed it 1342 } else { 1343 intercepted = false; 1344 } 1345 } else { 1346 // There are no touch targets and this action is not an initial down 1347 // so this view group continues to intercept touches. 1348 intercepted = true; 1349 } 1350 1351 // Check for cancelation. 1352 final boolean canceled = resetCancelNextUpFlag(this) 1353 || actionMasked == MotionEvent.ACTION_CANCEL; 1354 1355 // Update list of touch targets for pointer down, if needed. 1356 final boolean split = (mGroupFlags & FLAG_SPLIT_MOTION_EVENTS) != 0; 1357 TouchTarget newTouchTarget = null; 1358 boolean alreadyDispatchedToNewTouchTarget = false; 1359 if (!canceled && !intercepted) { 1360 if (actionMasked == MotionEvent.ACTION_DOWN 1361 || (split && actionMasked == MotionEvent.ACTION_POINTER_DOWN) 1362 || actionMasked == MotionEvent.ACTION_HOVER_MOVE) { 1363 final int actionIndex = ev.getActionIndex(); // always 0 for down 1364 final int idBitsToAssign = split ? 1 << ev.getPointerId(actionIndex) 1365 : TouchTarget.ALL_POINTER_IDS; 1366 1367 // Clean up earlier touch targets for this pointer id in case they 1368 // have become out of sync. 1369 removePointersFromTouchTargets(idBitsToAssign); 1370 1371 final int childrenCount = mChildrenCount; 1372 if (childrenCount != 0) { 1373 // Find a child that can receive the event. Scan children from front to back. 1374 final View[] children = mChildren; 1375 final float x = ev.getX(actionIndex); 1376 final float y = ev.getY(actionIndex); 1377 1378 for (int i = childrenCount - 1; i >= 0; i--) { 1379 final View child = children[i]; 1380 if (!canViewReceivePointerEvents(child) 1381 || !isTransformedTouchPointInView(x, y, child, null)) { 1382 continue; 1383 } 1384 1385 newTouchTarget = getTouchTarget(child); 1386 if (newTouchTarget != null) { 1387 // Child is already receiving touch within its bounds. 1388 // Give it the new pointer in addition to the ones it is handling. 1389 newTouchTarget.pointerIdBits |= idBitsToAssign; 1390 break; 1391 } 1392 1393 resetCancelNextUpFlag(child); 1394 if (dispatchTransformedTouchEvent(ev, false, child, idBitsToAssign)) { 1395 // Child wants to receive touch within its bounds. 1396 mLastTouchDownTime = ev.getDownTime(); 1397 mLastTouchDownIndex = i; 1398 mLastTouchDownX = ev.getX(); 1399 mLastTouchDownY = ev.getY(); 1400 newTouchTarget = addTouchTarget(child, idBitsToAssign); 1401 alreadyDispatchedToNewTouchTarget = true; 1402 break; 1403 } 1404 } 1405 } 1406 1407 if (newTouchTarget == null && mFirstTouchTarget != null) { 1408 // Did not find a child to receive the event. 1409 // Assign the pointer to the least recently added target. 1410 newTouchTarget = mFirstTouchTarget; 1411 while (newTouchTarget.next != null) { 1412 newTouchTarget = newTouchTarget.next; 1413 } 1414 newTouchTarget.pointerIdBits |= idBitsToAssign; 1415 } 1416 } 1417 } 1418 1419 // Dispatch to touch targets. 1420 boolean handled = false; 1421 if (mFirstTouchTarget == null) { 1422 // No touch targets so treat this as an ordinary view. 1423 handled = dispatchTransformedTouchEvent(ev, canceled, null, 1424 TouchTarget.ALL_POINTER_IDS); 1425 } else { 1426 // Dispatch to touch targets, excluding the new touch target if we already 1427 // dispatched to it. Cancel touch targets if necessary. 1428 TouchTarget predecessor = null; 1429 TouchTarget target = mFirstTouchTarget; 1430 while (target != null) { 1431 final TouchTarget next = target.next; 1432 if (alreadyDispatchedToNewTouchTarget && target == newTouchTarget) { 1433 handled = true; 1434 } else { 1435 final boolean cancelChild = resetCancelNextUpFlag(target.child) || intercepted; 1436 if (dispatchTransformedTouchEvent(ev, cancelChild, 1437 target.child, target.pointerIdBits)) { 1438 handled = true; 1439 } 1440 if (cancelChild) { 1441 if (predecessor == null) { 1442 mFirstTouchTarget = next; 1443 } else { 1444 predecessor.next = next; 1445 } 1446 target.recycle(); 1447 target = next; 1448 continue; 1449 } 1450 } 1451 predecessor = target; 1452 target = next; 1453 } 1454 } 1455 1456 // Update list of touch targets for pointer up or cancel, if needed. 1457 if (canceled 1458 || actionMasked == MotionEvent.ACTION_UP 1459 || actionMasked == MotionEvent.ACTION_HOVER_MOVE) { 1460 resetTouchState(); 1461 } else if (split && actionMasked == MotionEvent.ACTION_POINTER_UP) { 1462 final int actionIndex = ev.getActionIndex(); 1463 final int idBitsToRemove = 1 << ev.getPointerId(actionIndex); 1464 removePointersFromTouchTargets(idBitsToRemove); 1465 } 1466 1467 return handled; 1468 } 1469 1470 /** 1471 * Resets all touch state in preparation for a new cycle. 1472 */ 1473 private void resetTouchState() { 1474 clearTouchTargets(); 1475 resetCancelNextUpFlag(this); 1476 mGroupFlags &= ~FLAG_DISALLOW_INTERCEPT; 1477 } 1478 1479 /** 1480 * Resets the cancel next up flag. 1481 * Returns true if the flag was previously set. 1482 */ 1483 private boolean resetCancelNextUpFlag(View view) { 1484 if ((view.mPrivateFlags & CANCEL_NEXT_UP_EVENT) != 0) { 1485 view.mPrivateFlags &= ~CANCEL_NEXT_UP_EVENT; 1486 return true; 1487 } 1488 return false; 1489 } 1490 1491 /** 1492 * Clears all touch targets. 1493 */ 1494 private void clearTouchTargets() { 1495 TouchTarget target = mFirstTouchTarget; 1496 if (target != null) { 1497 do { 1498 TouchTarget next = target.next; 1499 target.recycle(); 1500 target = next; 1501 } while (target != null); 1502 mFirstTouchTarget = null; 1503 } 1504 } 1505 1506 /** 1507 * Cancels and clears all touch targets. 1508 */ 1509 private void cancelAndClearTouchTargets(MotionEvent event) { 1510 if (mFirstTouchTarget != null) { 1511 boolean syntheticEvent = false; 1512 if (event == null) { 1513 final long now = SystemClock.uptimeMillis(); 1514 event = MotionEvent.obtain(now, now, 1515 MotionEvent.ACTION_CANCEL, 0.0f, 0.0f, 0); 1516 syntheticEvent = true; 1517 } 1518 1519 for (TouchTarget target = mFirstTouchTarget; target != null; target = target.next) { 1520 resetCancelNextUpFlag(target.child); 1521 dispatchTransformedTouchEvent(event, true, target.child, target.pointerIdBits); 1522 } 1523 clearTouchTargets(); 1524 1525 if (syntheticEvent) { 1526 event.recycle(); 1527 } 1528 } 1529 } 1530 1531 /** 1532 * Gets the touch target for specified child view. 1533 * Returns null if not found. 1534 */ 1535 private TouchTarget getTouchTarget(View child) { 1536 for (TouchTarget target = mFirstTouchTarget; target != null; target = target.next) { 1537 if (target.child == child) { 1538 return target; 1539 } 1540 } 1541 return null; 1542 } 1543 1544 /** 1545 * Adds a touch target for specified child to the beginning of the list. 1546 * Assumes the target child is not already present. 1547 */ 1548 private TouchTarget addTouchTarget(View child, int pointerIdBits) { 1549 TouchTarget target = TouchTarget.obtain(child, pointerIdBits); 1550 target.next = mFirstTouchTarget; 1551 mFirstTouchTarget = target; 1552 return target; 1553 } 1554 1555 /** 1556 * Removes the pointer ids from consideration. 1557 */ 1558 private void removePointersFromTouchTargets(int pointerIdBits) { 1559 TouchTarget predecessor = null; 1560 TouchTarget target = mFirstTouchTarget; 1561 while (target != null) { 1562 final TouchTarget next = target.next; 1563 if ((target.pointerIdBits & pointerIdBits) != 0) { 1564 target.pointerIdBits &= ~pointerIdBits; 1565 if (target.pointerIdBits == 0) { 1566 if (predecessor == null) { 1567 mFirstTouchTarget = next; 1568 } else { 1569 predecessor.next = next; 1570 } 1571 target.recycle(); 1572 target = next; 1573 continue; 1574 } 1575 } 1576 predecessor = target; 1577 target = next; 1578 } 1579 } 1580 1581 /** 1582 * Returns true if a child view can receive pointer events. 1583 * @hide 1584 */ 1585 private static boolean canViewReceivePointerEvents(View child) { 1586 return (child.mViewFlags & VISIBILITY_MASK) == VISIBLE 1587 || child.getAnimation() != null; 1588 } 1589 1590 /** 1591 * Returns true if a child view contains the specified point when transformed 1592 * into its coordinate space. 1593 * Child must not be null. 1594 * @hide 1595 */ 1596 protected boolean isTransformedTouchPointInView(float x, float y, View child, 1597 PointF outLocalPoint) { 1598 float localX = x + mScrollX - child.mLeft; 1599 float localY = y + mScrollY - child.mTop; 1600 if (! child.hasIdentityMatrix() && mAttachInfo != null) { 1601 final float[] localXY = mAttachInfo.mTmpTransformLocation; 1602 localXY[0] = localX; 1603 localXY[1] = localY; 1604 child.getInverseMatrix().mapPoints(localXY); 1605 localX = localXY[0]; 1606 localY = localXY[1]; 1607 } 1608 final boolean isInView = child.pointInView(localX, localY); 1609 if (isInView && outLocalPoint != null) { 1610 outLocalPoint.set(localX, localY); 1611 } 1612 return isInView; 1613 } 1614 1615 /** 1616 * Transforms a motion event into the coordinate space of a particular child view, 1617 * filters out irrelevant pointer ids, and overrides its action if necessary. 1618 * If child is null, assumes the MotionEvent will be sent to this ViewGroup instead. 1619 */ 1620 private boolean dispatchTransformedTouchEvent(MotionEvent event, boolean cancel, 1621 View child, int desiredPointerIdBits) { 1622 final boolean handled; 1623 1624 // Canceling motions is a special case. We don't need to perform any transformations 1625 // or filtering. The important part is the action, not the contents. 1626 final int oldAction = event.getAction(); 1627 if (cancel || oldAction == MotionEvent.ACTION_CANCEL) { 1628 event.setAction(MotionEvent.ACTION_CANCEL); 1629 if (child == null) { 1630 handled = super.dispatchTouchEvent(event); 1631 } else { 1632 handled = child.dispatchTouchEvent(event); 1633 } 1634 event.setAction(oldAction); 1635 return handled; 1636 } 1637 1638 // Calculate the number of pointers to deliver. 1639 final int oldPointerCount = event.getPointerCount(); 1640 int newPointerCount = 0; 1641 if (desiredPointerIdBits == TouchTarget.ALL_POINTER_IDS) { 1642 newPointerCount = oldPointerCount; 1643 } else { 1644 for (int i = 0; i < oldPointerCount; i++) { 1645 final int pointerId = event.getPointerId(i); 1646 final int pointerIdBit = 1 << pointerId; 1647 if ((pointerIdBit & desiredPointerIdBits) != 0) { 1648 newPointerCount += 1; 1649 } 1650 } 1651 } 1652 1653 // If for some reason we ended up in an inconsistent state where it looks like we 1654 // might produce a motion event with no pointers in it, then drop the event. 1655 if (newPointerCount == 0) { 1656 return false; 1657 } 1658 1659 // If the number of pointers is the same and we don't need to perform any fancy 1660 // irreversible transformations, then we can reuse the motion event for this 1661 // dispatch as long as we are careful to revert any changes we make. 1662 final boolean reuse = newPointerCount == oldPointerCount 1663 && (child == null || child.hasIdentityMatrix()); 1664 if (reuse) { 1665 if (child == null) { 1666 handled = super.dispatchTouchEvent(event); 1667 } else { 1668 final float offsetX = mScrollX - child.mLeft; 1669 final float offsetY = mScrollY - child.mTop; 1670 event.offsetLocation(offsetX, offsetY); 1671 1672 handled = child.dispatchTouchEvent(event); 1673 1674 event.offsetLocation(-offsetX, -offsetY); 1675 } 1676 return handled; 1677 } 1678 1679 // Make a copy of the event. 1680 // If the number of pointers is different, then we need to filter out irrelevant pointers 1681 // as we make a copy of the motion event. 1682 MotionEvent transformedEvent; 1683 if (newPointerCount == oldPointerCount) { 1684 transformedEvent = MotionEvent.obtain(event); 1685 } else { 1686 growTmpPointerArrays(newPointerCount); 1687 final int[] newPointerIndexMap = mTmpPointerIndexMap; 1688 final int[] newPointerIds = mTmpPointerIds; 1689 final MotionEvent.PointerCoords[] newPointerCoords = mTmpPointerCoords; 1690 1691 int newPointerIndex = 0; 1692 int oldPointerIndex = 0; 1693 while (newPointerIndex < newPointerCount) { 1694 final int pointerId = event.getPointerId(oldPointerIndex); 1695 final int pointerIdBits = 1 << pointerId; 1696 if ((pointerIdBits & desiredPointerIdBits) != 0) { 1697 newPointerIndexMap[newPointerIndex] = oldPointerIndex; 1698 newPointerIds[newPointerIndex] = pointerId; 1699 if (newPointerCoords[newPointerIndex] == null) { 1700 newPointerCoords[newPointerIndex] = new MotionEvent.PointerCoords(); 1701 } 1702 1703 newPointerIndex += 1; 1704 } 1705 oldPointerIndex += 1; 1706 } 1707 1708 final int newAction; 1709 if (cancel) { 1710 newAction = MotionEvent.ACTION_CANCEL; 1711 } else { 1712 final int oldMaskedAction = oldAction & MotionEvent.ACTION_MASK; 1713 if (oldMaskedAction == MotionEvent.ACTION_POINTER_DOWN 1714 || oldMaskedAction == MotionEvent.ACTION_POINTER_UP) { 1715 final int changedPointerId = event.getPointerId( 1716 (oldAction & MotionEvent.ACTION_POINTER_INDEX_MASK) 1717 >> MotionEvent.ACTION_POINTER_INDEX_SHIFT); 1718 final int changedPointerIdBits = 1 << changedPointerId; 1719 if ((changedPointerIdBits & desiredPointerIdBits) != 0) { 1720 if (newPointerCount == 1) { 1721 // The first/last pointer went down/up. 1722 newAction = oldMaskedAction == MotionEvent.ACTION_POINTER_DOWN 1723 ? MotionEvent.ACTION_DOWN : MotionEvent.ACTION_UP; 1724 } else { 1725 // A secondary pointer went down/up. 1726 int newChangedPointerIndex = 0; 1727 while (newPointerIds[newChangedPointerIndex] != changedPointerId) { 1728 newChangedPointerIndex += 1; 1729 } 1730 newAction = oldMaskedAction | (newChangedPointerIndex 1731 << MotionEvent.ACTION_POINTER_INDEX_SHIFT); 1732 } 1733 } else { 1734 // An unrelated pointer changed. 1735 newAction = MotionEvent.ACTION_MOVE; 1736 } 1737 } else { 1738 // Simple up/down/cancel/move motion action. 1739 newAction = oldMaskedAction; 1740 } 1741 } 1742 1743 transformedEvent = null; 1744 final int historySize = event.getHistorySize(); 1745 for (int historyIndex = 0; historyIndex <= historySize; historyIndex++) { 1746 for (newPointerIndex = 0; newPointerIndex < newPointerCount; newPointerIndex++) { 1747 final MotionEvent.PointerCoords c = newPointerCoords[newPointerIndex]; 1748 oldPointerIndex = newPointerIndexMap[newPointerIndex]; 1749 if (historyIndex != historySize) { 1750 event.getHistoricalPointerCoords(oldPointerIndex, historyIndex, c); 1751 } else { 1752 event.getPointerCoords(oldPointerIndex, c); 1753 } 1754 } 1755 1756 final long eventTime; 1757 if (historyIndex != historySize) { 1758 eventTime = event.getHistoricalEventTime(historyIndex); 1759 } else { 1760 eventTime = event.getEventTime(); 1761 } 1762 1763 if (transformedEvent == null) { 1764 transformedEvent = MotionEvent.obtain( 1765 event.getDownTime(), eventTime, newAction, 1766 newPointerCount, newPointerIds, newPointerCoords, 1767 event.getMetaState(), event.getXPrecision(), event.getYPrecision(), 1768 event.getDeviceId(), event.getEdgeFlags(), event.getSource(), 1769 event.getFlags()); 1770 } else { 1771 transformedEvent.addBatch(eventTime, newPointerCoords, 0); 1772 } 1773 } 1774 } 1775 1776 // Perform any necessary transformations and dispatch. 1777 if (child == null) { 1778 handled = super.dispatchTouchEvent(transformedEvent); 1779 } else { 1780 final float offsetX = mScrollX - child.mLeft; 1781 final float offsetY = mScrollY - child.mTop; 1782 transformedEvent.offsetLocation(offsetX, offsetY); 1783 if (! child.hasIdentityMatrix()) { 1784 transformedEvent.transform(child.getInverseMatrix()); 1785 } 1786 1787 handled = child.dispatchTouchEvent(transformedEvent); 1788 } 1789 1790 // Done. 1791 transformedEvent.recycle(); 1792 return handled; 1793 } 1794 1795 /** 1796 * Enlarge the temporary pointer arrays for splitting pointers. 1797 * May discard contents (but keeps PointerCoords objects to avoid reallocating them). 1798 */ 1799 private void growTmpPointerArrays(int desiredCapacity) { 1800 final MotionEvent.PointerCoords[] oldTmpPointerCoords = mTmpPointerCoords; 1801 int capacity; 1802 if (oldTmpPointerCoords != null) { 1803 capacity = oldTmpPointerCoords.length; 1804 if (desiredCapacity <= capacity) { 1805 return; 1806 } 1807 } else { 1808 capacity = 4; 1809 } 1810 1811 while (capacity < desiredCapacity) { 1812 capacity *= 2; 1813 } 1814 1815 mTmpPointerIndexMap = new int[capacity]; 1816 mTmpPointerIds = new int[capacity]; 1817 mTmpPointerCoords = new MotionEvent.PointerCoords[capacity]; 1818 1819 if (oldTmpPointerCoords != null) { 1820 System.arraycopy(oldTmpPointerCoords, 0, mTmpPointerCoords, 0, 1821 oldTmpPointerCoords.length); 1822 } 1823 } 1824 1825 /** 1826 * Enable or disable the splitting of MotionEvents to multiple children during touch event 1827 * dispatch. This behavior is enabled by default for applications that target an 1828 * SDK version of {@link Build.VERSION_CODES#HONEYCOMB} or newer. 1829 * 1830 * <p>When this option is enabled MotionEvents may be split and dispatched to different child 1831 * views depending on where each pointer initially went down. This allows for user interactions 1832 * such as scrolling two panes of content independently, chording of buttons, and performing 1833 * independent gestures on different pieces of content. 1834 * 1835 * @param split <code>true</code> to allow MotionEvents to be split and dispatched to multiple 1836 * child views. <code>false</code> to only allow one child view to be the target of 1837 * any MotionEvent received by this ViewGroup. 1838 */ 1839 public void setMotionEventSplittingEnabled(boolean split) { 1840 // TODO Applications really shouldn't change this setting mid-touch event, 1841 // but perhaps this should handle that case and send ACTION_CANCELs to any child views 1842 // with gestures in progress when this is changed. 1843 if (split) { 1844 mGroupFlags |= FLAG_SPLIT_MOTION_EVENTS; 1845 } else { 1846 mGroupFlags &= ~FLAG_SPLIT_MOTION_EVENTS; 1847 } 1848 } 1849 1850 /** 1851 * Returns true if MotionEvents dispatched to this ViewGroup can be split to multiple children. 1852 * @return true if MotionEvents dispatched to this ViewGroup can be split to multiple children. 1853 */ 1854 public boolean isMotionEventSplittingEnabled() { 1855 return (mGroupFlags & FLAG_SPLIT_MOTION_EVENTS) == FLAG_SPLIT_MOTION_EVENTS; 1856 } 1857 1858 /** 1859 * {@inheritDoc} 1860 */ 1861 public void requestDisallowInterceptTouchEvent(boolean disallowIntercept) { 1862 1863 if (disallowIntercept == ((mGroupFlags & FLAG_DISALLOW_INTERCEPT) != 0)) { 1864 // We're already in this state, assume our ancestors are too 1865 return; 1866 } 1867 1868 if (disallowIntercept) { 1869 mGroupFlags |= FLAG_DISALLOW_INTERCEPT; 1870 } else { 1871 mGroupFlags &= ~FLAG_DISALLOW_INTERCEPT; 1872 } 1873 1874 // Pass it up to our parent 1875 if (mParent != null) { 1876 mParent.requestDisallowInterceptTouchEvent(disallowIntercept); 1877 } 1878 } 1879 1880 /** 1881 * Implement this method to intercept all touch screen motion events. This 1882 * allows you to watch events as they are dispatched to your children, and 1883 * take ownership of the current gesture at any point. 1884 * 1885 * <p>Using this function takes some care, as it has a fairly complicated 1886 * interaction with {@link View#onTouchEvent(MotionEvent) 1887 * View.onTouchEvent(MotionEvent)}, and using it requires implementing 1888 * that method as well as this one in the correct way. Events will be 1889 * received in the following order: 1890 * 1891 * <ol> 1892 * <li> You will receive the down event here. 1893 * <li> The down event will be handled either by a child of this view 1894 * group, or given to your own onTouchEvent() method to handle; this means 1895 * you should implement onTouchEvent() to return true, so you will 1896 * continue to see the rest of the gesture (instead of looking for 1897 * a parent view to handle it). Also, by returning true from 1898 * onTouchEvent(), you will not receive any following 1899 * events in onInterceptTouchEvent() and all touch processing must 1900 * happen in onTouchEvent() like normal. 1901 * <li> For as long as you return false from this function, each following 1902 * event (up to and including the final up) will be delivered first here 1903 * and then to the target's onTouchEvent(). 1904 * <li> If you return true from here, you will not receive any 1905 * following events: the target view will receive the same event but 1906 * with the action {@link MotionEvent#ACTION_CANCEL}, and all further 1907 * events will be delivered to your onTouchEvent() method and no longer 1908 * appear here. 1909 * </ol> 1910 * 1911 * @param ev The motion event being dispatched down the hierarchy. 1912 * @return Return true to steal motion events from the children and have 1913 * them dispatched to this ViewGroup through onTouchEvent(). 1914 * The current target will receive an ACTION_CANCEL event, and no further 1915 * messages will be delivered here. 1916 */ 1917 public boolean onInterceptTouchEvent(MotionEvent ev) { 1918 return false; 1919 } 1920 1921 /** 1922 * {@inheritDoc} 1923 * 1924 * Looks for a view to give focus to respecting the setting specified by 1925 * {@link #getDescendantFocusability()}. 1926 * 1927 * Uses {@link #onRequestFocusInDescendants(int, android.graphics.Rect)} to 1928 * find focus within the children of this group when appropriate. 1929 * 1930 * @see #FOCUS_BEFORE_DESCENDANTS 1931 * @see #FOCUS_AFTER_DESCENDANTS 1932 * @see #FOCUS_BLOCK_DESCENDANTS 1933 * @see #onRequestFocusInDescendants 1934 */ 1935 @Override 1936 public boolean requestFocus(int direction, Rect previouslyFocusedRect) { 1937 if (DBG) { 1938 System.out.println(this + " ViewGroup.requestFocus direction=" 1939 + direction); 1940 } 1941 int descendantFocusability = getDescendantFocusability(); 1942 1943 switch (descendantFocusability) { 1944 case FOCUS_BLOCK_DESCENDANTS: 1945 return super.requestFocus(direction, previouslyFocusedRect); 1946 case FOCUS_BEFORE_DESCENDANTS: { 1947 final boolean took = super.requestFocus(direction, previouslyFocusedRect); 1948 return took ? took : onRequestFocusInDescendants(direction, previouslyFocusedRect); 1949 } 1950 case FOCUS_AFTER_DESCENDANTS: { 1951 final boolean took = onRequestFocusInDescendants(direction, previouslyFocusedRect); 1952 return took ? took : super.requestFocus(direction, previouslyFocusedRect); 1953 } 1954 default: 1955 throw new IllegalStateException("descendant focusability must be " 1956 + "one of FOCUS_BEFORE_DESCENDANTS, FOCUS_AFTER_DESCENDANTS, FOCUS_BLOCK_DESCENDANTS " 1957 + "but is " + descendantFocusability); 1958 } 1959 } 1960 1961 /** 1962 * Look for a descendant to call {@link View#requestFocus} on. 1963 * Called by {@link ViewGroup#requestFocus(int, android.graphics.Rect)} 1964 * when it wants to request focus within its children. Override this to 1965 * customize how your {@link ViewGroup} requests focus within its children. 1966 * @param direction One of FOCUS_UP, FOCUS_DOWN, FOCUS_LEFT, and FOCUS_RIGHT 1967 * @param previouslyFocusedRect The rectangle (in this View's coordinate system) 1968 * to give a finer grained hint about where focus is coming from. May be null 1969 * if there is no hint. 1970 * @return Whether focus was taken. 1971 */ 1972 @SuppressWarnings({"ConstantConditions"}) 1973 protected boolean onRequestFocusInDescendants(int direction, 1974 Rect previouslyFocusedRect) { 1975 int index; 1976 int increment; 1977 int end; 1978 int count = mChildrenCount; 1979 if ((direction & FOCUS_FORWARD) != 0) { 1980 index = 0; 1981 increment = 1; 1982 end = count; 1983 } else { 1984 index = count - 1; 1985 increment = -1; 1986 end = -1; 1987 } 1988 final View[] children = mChildren; 1989 for (int i = index; i != end; i += increment) { 1990 View child = children[i]; 1991 if ((child.mViewFlags & VISIBILITY_MASK) == VISIBLE) { 1992 if (child.requestFocus(direction, previouslyFocusedRect)) { 1993 return true; 1994 } 1995 } 1996 } 1997 return false; 1998 } 1999 2000 /** 2001 * {@inheritDoc} 2002 * 2003 * @hide 2004 */ 2005 @Override 2006 public void dispatchStartTemporaryDetach() { 2007 super.dispatchStartTemporaryDetach(); 2008 final int count = mChildrenCount; 2009 final View[] children = mChildren; 2010 for (int i = 0; i < count; i++) { 2011 children[i].dispatchStartTemporaryDetach(); 2012 } 2013 } 2014 2015 /** 2016 * {@inheritDoc} 2017 * 2018 * @hide 2019 */ 2020 @Override 2021 public void dispatchFinishTemporaryDetach() { 2022 super.dispatchFinishTemporaryDetach(); 2023 final int count = mChildrenCount; 2024 final View[] children = mChildren; 2025 for (int i = 0; i < count; i++) { 2026 children[i].dispatchFinishTemporaryDetach(); 2027 } 2028 } 2029 2030 /** 2031 * {@inheritDoc} 2032 */ 2033 @Override 2034 void dispatchAttachedToWindow(AttachInfo info, int visibility) { 2035 super.dispatchAttachedToWindow(info, visibility); 2036 visibility |= mViewFlags & VISIBILITY_MASK; 2037 final int count = mChildrenCount; 2038 final View[] children = mChildren; 2039 for (int i = 0; i < count; i++) { 2040 children[i].dispatchAttachedToWindow(info, visibility); 2041 } 2042 } 2043 2044 @Override 2045 public boolean dispatchPopulateAccessibilityEvent(AccessibilityEvent event) { 2046 boolean populated = false; 2047 for (int i = 0, count = getChildCount(); i < count; i++) { 2048 populated |= getChildAt(i).dispatchPopulateAccessibilityEvent(event); 2049 } 2050 return populated; 2051 } 2052 2053 /** 2054 * {@inheritDoc} 2055 */ 2056 @Override 2057 void dispatchDetachedFromWindow() { 2058 // If we still have a touch target, we are still in the process of 2059 // dispatching motion events to a child; we need to get rid of that 2060 // child to avoid dispatching events to it after the window is torn 2061 // down. To make sure we keep the child in a consistent state, we 2062 // first send it an ACTION_CANCEL motion event. 2063 cancelAndClearTouchTargets(null); 2064 2065 // In case view is detached while transition is running 2066 mLayoutSuppressed = false; 2067 2068 // Tear down our drag tracking 2069 mDragNotifiedChildren = null; 2070 if (mCurrentDrag != null) { 2071 mCurrentDrag.recycle(); 2072 mCurrentDrag = null; 2073 } 2074 2075 final int count = mChildrenCount; 2076 final View[] children = mChildren; 2077 for (int i = 0; i < count; i++) { 2078 children[i].dispatchDetachedFromWindow(); 2079 } 2080 super.dispatchDetachedFromWindow(); 2081 } 2082 2083 /** 2084 * {@inheritDoc} 2085 */ 2086 @Override 2087 public void setPadding(int left, int top, int right, int bottom) { 2088 super.setPadding(left, top, right, bottom); 2089 2090 if ((mPaddingLeft | mPaddingTop | mPaddingRight | mPaddingBottom) != 0) { 2091 mGroupFlags |= FLAG_PADDING_NOT_NULL; 2092 } else { 2093 mGroupFlags &= ~FLAG_PADDING_NOT_NULL; 2094 } 2095 } 2096 2097 /** 2098 * {@inheritDoc} 2099 */ 2100 @Override 2101 protected void dispatchSaveInstanceState(SparseArray<Parcelable> container) { 2102 super.dispatchSaveInstanceState(container); 2103 final int count = mChildrenCount; 2104 final View[] children = mChildren; 2105 for (int i = 0; i < count; i++) { 2106 View c = children[i]; 2107 if ((c.mViewFlags & PARENT_SAVE_DISABLED_MASK) != PARENT_SAVE_DISABLED) { 2108 c.dispatchSaveInstanceState(container); 2109 } 2110 } 2111 } 2112 2113 /** 2114 * Perform dispatching of a {@link #saveHierarchyState freeze()} to only this view, 2115 * not to its children. For use when overriding 2116 * {@link #dispatchSaveInstanceState dispatchFreeze()} to allow subclasses to freeze 2117 * their own state but not the state of their children. 2118 * 2119 * @param container the container 2120 */ 2121 protected void dispatchFreezeSelfOnly(SparseArray<Parcelable> container) { 2122 super.dispatchSaveInstanceState(container); 2123 } 2124 2125 /** 2126 * {@inheritDoc} 2127 */ 2128 @Override 2129 protected void dispatchRestoreInstanceState(SparseArray<Parcelable> container) { 2130 super.dispatchRestoreInstanceState(container); 2131 final int count = mChildrenCount; 2132 final View[] children = mChildren; 2133 for (int i = 0; i < count; i++) { 2134 View c = children[i]; 2135 if ((c.mViewFlags & PARENT_SAVE_DISABLED_MASK) != PARENT_SAVE_DISABLED) { 2136 c.dispatchRestoreInstanceState(container); 2137 } 2138 } 2139 } 2140 2141 /** 2142 * Perform dispatching of a {@link #restoreHierarchyState thaw()} to only this view, 2143 * not to its children. For use when overriding 2144 * {@link #dispatchRestoreInstanceState dispatchThaw()} to allow subclasses to thaw 2145 * their own state but not the state of their children. 2146 * 2147 * @param container the container 2148 */ 2149 protected void dispatchThawSelfOnly(SparseArray<Parcelable> container) { 2150 super.dispatchRestoreInstanceState(container); 2151 } 2152 2153 /** 2154 * Enables or disables the drawing cache for each child of this view group. 2155 * 2156 * @param enabled true to enable the cache, false to dispose of it 2157 */ 2158 protected void setChildrenDrawingCacheEnabled(boolean enabled) { 2159 if (enabled || (mPersistentDrawingCache & PERSISTENT_ALL_CACHES) != PERSISTENT_ALL_CACHES) { 2160 final View[] children = mChildren; 2161 final int count = mChildrenCount; 2162 for (int i = 0; i < count; i++) { 2163 children[i].setDrawingCacheEnabled(enabled); 2164 } 2165 } 2166 } 2167 2168 @Override 2169 protected void onAnimationStart() { 2170 super.onAnimationStart(); 2171 2172 // When this ViewGroup's animation starts, build the cache for the children 2173 if ((mGroupFlags & FLAG_ANIMATION_CACHE) == FLAG_ANIMATION_CACHE) { 2174 final int count = mChildrenCount; 2175 final View[] children = mChildren; 2176 final boolean buildCache = !isHardwareAccelerated(); 2177 2178 for (int i = 0; i < count; i++) { 2179 final View child = children[i]; 2180 if ((child.mViewFlags & VISIBILITY_MASK) == VISIBLE) { 2181 child.setDrawingCacheEnabled(true); 2182 if (buildCache) { 2183 child.buildDrawingCache(true); 2184 } 2185 } 2186 } 2187 2188 mGroupFlags |= FLAG_CHILDREN_DRAWN_WITH_CACHE; 2189 } 2190 } 2191 2192 @Override 2193 protected void onAnimationEnd() { 2194 super.onAnimationEnd(); 2195 2196 // When this ViewGroup's animation ends, destroy the cache of the children 2197 if ((mGroupFlags & FLAG_ANIMATION_CACHE) == FLAG_ANIMATION_CACHE) { 2198 mGroupFlags &= ~FLAG_CHILDREN_DRAWN_WITH_CACHE; 2199 2200 if ((mPersistentDrawingCache & PERSISTENT_ANIMATION_CACHE) == 0) { 2201 setChildrenDrawingCacheEnabled(false); 2202 } 2203 } 2204 } 2205 2206 @Override 2207 Bitmap createSnapshot(Bitmap.Config quality, int backgroundColor, boolean skipChildren) { 2208 int count = mChildrenCount; 2209 int[] visibilities = null; 2210 2211 if (skipChildren) { 2212 visibilities = new int[count]; 2213 for (int i = 0; i < count; i++) { 2214 View child = getChildAt(i); 2215 visibilities[i] = child.getVisibility(); 2216 if (visibilities[i] == View.VISIBLE) { 2217 child.setVisibility(INVISIBLE); 2218 } 2219 } 2220 } 2221 2222 Bitmap b = super.createSnapshot(quality, backgroundColor, skipChildren); 2223 2224 if (skipChildren) { 2225 for (int i = 0; i < count; i++) { 2226 getChildAt(i).setVisibility(visibilities[i]); 2227 } 2228 } 2229 2230 return b; 2231 } 2232 2233 /** 2234 * {@inheritDoc} 2235 */ 2236 @Override 2237 protected void dispatchDraw(Canvas canvas) { 2238 final int count = mChildrenCount; 2239 final View[] children = mChildren; 2240 int flags = mGroupFlags; 2241 2242 if ((flags & FLAG_RUN_ANIMATION) != 0 && canAnimate()) { 2243 final boolean cache = (mGroupFlags & FLAG_ANIMATION_CACHE) == FLAG_ANIMATION_CACHE; 2244 2245 final boolean buildCache = !isHardwareAccelerated(); 2246 for (int i = 0; i < count; i++) { 2247 final View child = children[i]; 2248 if ((child.mViewFlags & VISIBILITY_MASK) == VISIBLE) { 2249 final LayoutParams params = child.getLayoutParams(); 2250 attachLayoutAnimationParameters(child, params, i, count); 2251 bindLayoutAnimation(child); 2252 if (cache) { 2253 child.setDrawingCacheEnabled(true); 2254 if (buildCache) { 2255 child.buildDrawingCache(true); 2256 } 2257 } 2258 } 2259 } 2260 2261 final LayoutAnimationController controller = mLayoutAnimationController; 2262 if (controller.willOverlap()) { 2263 mGroupFlags |= FLAG_OPTIMIZE_INVALIDATE; 2264 } 2265 2266 controller.start(); 2267 2268 mGroupFlags &= ~FLAG_RUN_ANIMATION; 2269 mGroupFlags &= ~FLAG_ANIMATION_DONE; 2270 2271 if (cache) { 2272 mGroupFlags |= FLAG_CHILDREN_DRAWN_WITH_CACHE; 2273 } 2274 2275 if (mAnimationListener != null) { 2276 mAnimationListener.onAnimationStart(controller.getAnimation()); 2277 } 2278 } 2279 2280 int saveCount = 0; 2281 final boolean clipToPadding = (flags & CLIP_TO_PADDING_MASK) == CLIP_TO_PADDING_MASK; 2282 if (clipToPadding) { 2283 saveCount = canvas.save(); 2284 canvas.clipRect(mScrollX + mPaddingLeft, mScrollY + mPaddingTop, 2285 mScrollX + mRight - mLeft - mPaddingRight, 2286 mScrollY + mBottom - mTop - mPaddingBottom); 2287 2288 } 2289 2290 // We will draw our child's animation, let's reset the flag 2291 mPrivateFlags &= ~DRAW_ANIMATION; 2292 mGroupFlags &= ~FLAG_INVALIDATE_REQUIRED; 2293 2294 boolean more = false; 2295 final long drawingTime = getDrawingTime(); 2296 2297 if ((flags & FLAG_USE_CHILD_DRAWING_ORDER) == 0) { 2298 for (int i = 0; i < count; i++) { 2299 final View child = children[i]; 2300 if ((child.mViewFlags & VISIBILITY_MASK) == VISIBLE || child.getAnimation() != null) { 2301 more |= drawChild(canvas, child, drawingTime); 2302 } 2303 } 2304 } else { 2305 for (int i = 0; i < count; i++) { 2306 final View child = children[getChildDrawingOrder(count, i)]; 2307 if ((child.mViewFlags & VISIBILITY_MASK) == VISIBLE || child.getAnimation() != null) { 2308 more |= drawChild(canvas, child, drawingTime); 2309 } 2310 } 2311 } 2312 2313 // Draw any disappearing views that have animations 2314 if (mDisappearingChildren != null) { 2315 final ArrayList<View> disappearingChildren = mDisappearingChildren; 2316 final int disappearingCount = disappearingChildren.size() - 1; 2317 // Go backwards -- we may delete as animations finish 2318 for (int i = disappearingCount; i >= 0; i--) { 2319 final View child = disappearingChildren.get(i); 2320 more |= drawChild(canvas, child, drawingTime); 2321 } 2322 } 2323 2324 if (clipToPadding) { 2325 canvas.restoreToCount(saveCount); 2326 } 2327 2328 // mGroupFlags might have been updated by drawChild() 2329 flags = mGroupFlags; 2330 2331 if ((flags & FLAG_INVALIDATE_REQUIRED) == FLAG_INVALIDATE_REQUIRED) { 2332 invalidate(true); 2333 } 2334 2335 if ((flags & FLAG_ANIMATION_DONE) == 0 && (flags & FLAG_NOTIFY_ANIMATION_LISTENER) == 0 && 2336 mLayoutAnimationController.isDone() && !more) { 2337 // We want to erase the drawing cache and notify the listener after the 2338 // next frame is drawn because one extra invalidate() is caused by 2339 // drawChild() after the animation is over 2340 mGroupFlags |= FLAG_NOTIFY_ANIMATION_LISTENER; 2341 final Runnable end = new Runnable() { 2342 public void run() { 2343 notifyAnimationListener(); 2344 } 2345 }; 2346 post(end); 2347 } 2348 } 2349 2350 /** 2351 * Returns the index of the child to draw for this iteration. Override this 2352 * if you want to change the drawing order of children. By default, it 2353 * returns i. 2354 * <p> 2355 * NOTE: In order for this method to be called, you must enable child ordering 2356 * first by calling {@link #setChildrenDrawingOrderEnabled(boolean)}. 2357 * 2358 * @param i The current iteration. 2359 * @return The index of the child to draw this iteration. 2360 * 2361 * @see #setChildrenDrawingOrderEnabled(boolean) 2362 * @see #isChildrenDrawingOrderEnabled() 2363 */ 2364 protected int getChildDrawingOrder(int childCount, int i) { 2365 return i; 2366 } 2367 2368 private void notifyAnimationListener() { 2369 mGroupFlags &= ~FLAG_NOTIFY_ANIMATION_LISTENER; 2370 mGroupFlags |= FLAG_ANIMATION_DONE; 2371 2372 if (mAnimationListener != null) { 2373 final Runnable end = new Runnable() { 2374 public void run() { 2375 mAnimationListener.onAnimationEnd(mLayoutAnimationController.getAnimation()); 2376 } 2377 }; 2378 post(end); 2379 } 2380 2381 if ((mGroupFlags & FLAG_ANIMATION_CACHE) == FLAG_ANIMATION_CACHE) { 2382 mGroupFlags &= ~FLAG_CHILDREN_DRAWN_WITH_CACHE; 2383 if ((mPersistentDrawingCache & PERSISTENT_ANIMATION_CACHE) == 0) { 2384 setChildrenDrawingCacheEnabled(false); 2385 } 2386 } 2387 2388 invalidate(true); 2389 } 2390 2391 /** 2392 * This method is used to cause children of this ViewGroup to restore or recreate their 2393 * display lists. It is called by getDisplayList() when the parent ViewGroup does not need 2394 * to recreate its own display list, which would happen if it went through the normal 2395 * draw/dispatchDraw mechanisms. 2396 * 2397 * @hide 2398 */ 2399 @Override 2400 protected void dispatchGetDisplayList() { 2401 final int count = mChildrenCount; 2402 final View[] children = mChildren; 2403 for (int i = 0; i < count; i++) { 2404 final View child = children[i]; 2405 if ((child.mViewFlags & VISIBILITY_MASK) == VISIBLE || child.getAnimation() != null) { 2406 child.mRecreateDisplayList = (child.mPrivateFlags & INVALIDATED) == INVALIDATED; 2407 child.mPrivateFlags &= ~INVALIDATED; 2408 child.getDisplayList(); 2409 child.mRecreateDisplayList = false; 2410 } 2411 } 2412 } 2413 2414 /** 2415 * Draw one child of this View Group. This method is responsible for getting 2416 * the canvas in the right state. This includes clipping, translating so 2417 * that the child's scrolled origin is at 0, 0, and applying any animation 2418 * transformations. 2419 * 2420 * @param canvas The canvas on which to draw the child 2421 * @param child Who to draw 2422 * @param drawingTime The time at which draw is occuring 2423 * @return True if an invalidate() was issued 2424 */ 2425 protected boolean drawChild(Canvas canvas, View child, long drawingTime) { 2426 boolean more = false; 2427 2428 final int cl = child.mLeft; 2429 final int ct = child.mTop; 2430 final int cr = child.mRight; 2431 final int cb = child.mBottom; 2432 2433 final boolean childHasIdentityMatrix = child.hasIdentityMatrix(); 2434 2435 final int flags = mGroupFlags; 2436 2437 if ((flags & FLAG_CLEAR_TRANSFORMATION) == FLAG_CLEAR_TRANSFORMATION) { 2438 mChildTransformation.clear(); 2439 mGroupFlags &= ~FLAG_CLEAR_TRANSFORMATION; 2440 } 2441 2442 Transformation transformToApply = null; 2443 Transformation invalidationTransform; 2444 final Animation a = child.getAnimation(); 2445 boolean concatMatrix = false; 2446 2447 boolean scalingRequired = false; 2448 boolean caching; 2449 int layerType = mDrawLayers ? child.getLayerType() : LAYER_TYPE_NONE; 2450 2451 final boolean hardwareAccelerated = canvas.isHardwareAccelerated(); 2452 if ((flags & FLAG_CHILDREN_DRAWN_WITH_CACHE) == FLAG_CHILDREN_DRAWN_WITH_CACHE || 2453 (flags & FLAG_ALWAYS_DRAWN_WITH_CACHE) == FLAG_ALWAYS_DRAWN_WITH_CACHE) { 2454 caching = true; 2455 if (mAttachInfo != null) scalingRequired = mAttachInfo.mScalingRequired; 2456 } else { 2457 caching = (layerType != LAYER_TYPE_NONE) || hardwareAccelerated; 2458 } 2459 2460 if (a != null) { 2461 final boolean initialized = a.isInitialized(); 2462 if (!initialized) { 2463 a.initialize(cr - cl, cb - ct, getWidth(), getHeight()); 2464 a.initializeInvalidateRegion(0, 0, cr - cl, cb - ct); 2465 child.onAnimationStart(); 2466 } 2467 2468 more = a.getTransformation(drawingTime, mChildTransformation, 2469 scalingRequired ? mAttachInfo.mApplicationScale : 1f); 2470 if (scalingRequired && mAttachInfo.mApplicationScale != 1f) { 2471 if (mInvalidationTransformation == null) { 2472 mInvalidationTransformation = new Transformation(); 2473 } 2474 invalidationTransform = mInvalidationTransformation; 2475 a.getTransformation(drawingTime, invalidationTransform, 1f); 2476 } else { 2477 invalidationTransform = mChildTransformation; 2478 } 2479 transformToApply = mChildTransformation; 2480 2481 concatMatrix = a.willChangeTransformationMatrix(); 2482 2483 if (more) { 2484 if (!a.willChangeBounds()) { 2485 if ((flags & (FLAG_OPTIMIZE_INVALIDATE | FLAG_ANIMATION_DONE)) == 2486 FLAG_OPTIMIZE_INVALIDATE) { 2487 mGroupFlags |= FLAG_INVALIDATE_REQUIRED; 2488 } else if ((flags & FLAG_INVALIDATE_REQUIRED) == 0) { 2489 // The child need to draw an animation, potentially offscreen, so 2490 // make sure we do not cancel invalidate requests 2491 mPrivateFlags |= DRAW_ANIMATION; 2492 invalidate(cl, ct, cr, cb); 2493 } 2494 } else { 2495 if (mInvalidateRegion == null) { 2496 mInvalidateRegion = new RectF(); 2497 } 2498 final RectF region = mInvalidateRegion; 2499 a.getInvalidateRegion(0, 0, cr - cl, cb - ct, region, invalidationTransform); 2500 2501 // The child need to draw an animation, potentially offscreen, so 2502 // make sure we do not cancel invalidate requests 2503 mPrivateFlags |= DRAW_ANIMATION; 2504 2505 final int left = cl + (int) region.left; 2506 final int top = ct + (int) region.top; 2507 invalidate(left, top, left + (int) region.width(), top + (int) region.height()); 2508 } 2509 } 2510 } else if ((flags & FLAG_SUPPORT_STATIC_TRANSFORMATIONS) == 2511 FLAG_SUPPORT_STATIC_TRANSFORMATIONS) { 2512 final boolean hasTransform = getChildStaticTransformation(child, mChildTransformation); 2513 if (hasTransform) { 2514 final int transformType = mChildTransformation.getTransformationType(); 2515 transformToApply = transformType != Transformation.TYPE_IDENTITY ? 2516 mChildTransformation : null; 2517 concatMatrix = (transformType & Transformation.TYPE_MATRIX) != 0; 2518 } 2519 } 2520 2521 concatMatrix |= !childHasIdentityMatrix; 2522 2523 // Sets the flag as early as possible to allow draw() implementations 2524 // to call invalidate() successfully when doing animations 2525 child.mPrivateFlags |= DRAWN; 2526 2527 if (!concatMatrix && canvas.quickReject(cl, ct, cr, cb, Canvas.EdgeType.BW) && 2528 (child.mPrivateFlags & DRAW_ANIMATION) == 0) { 2529 return more; 2530 } 2531 2532 float alpha = child.getAlpha(); 2533 // Bail out early if the view does not need to be drawn 2534 if (alpha <= ViewConfiguration.ALPHA_THRESHOLD && (child.mPrivateFlags & ALPHA_SET) == 0 && 2535 !(child instanceof SurfaceView)) { 2536 return more; 2537 } 2538 2539 if (hardwareAccelerated) { 2540 // Clear INVALIDATED flag to allow invalidation to occur during rendering, but 2541 // retain the flag's value temporarily in the mRecreateDisplayList flag 2542 child.mRecreateDisplayList = (child.mPrivateFlags & INVALIDATED) == INVALIDATED; 2543 child.mPrivateFlags &= ~INVALIDATED; 2544 } 2545 2546 child.computeScroll(); 2547 2548 final int sx = child.mScrollX; 2549 final int sy = child.mScrollY; 2550 2551 DisplayList displayList = null; 2552 Bitmap cache = null; 2553 boolean hasDisplayList = false; 2554 if (caching) { 2555 if (!hardwareAccelerated) { 2556 if (layerType != LAYER_TYPE_NONE) { 2557 layerType = LAYER_TYPE_SOFTWARE; 2558 child.buildDrawingCache(true); 2559 } 2560 cache = child.getDrawingCache(true); 2561 } else { 2562 switch (layerType) { 2563 case LAYER_TYPE_SOFTWARE: 2564 child.buildDrawingCache(true); 2565 cache = child.getDrawingCache(true); 2566 break; 2567 case LAYER_TYPE_NONE: 2568 // Delay getting the display list until animation-driven alpha values are 2569 // set up and possibly passed on to the view 2570 hasDisplayList = child.canHaveDisplayList(); 2571 break; 2572 } 2573 } 2574 } 2575 2576 final boolean hasNoCache = cache == null || hasDisplayList; 2577 final boolean offsetForScroll = cache == null && !hasDisplayList && 2578 layerType != LAYER_TYPE_HARDWARE; 2579 2580 final int restoreTo = canvas.save(); 2581 if (offsetForScroll) { 2582 canvas.translate(cl - sx, ct - sy); 2583 } else { 2584 canvas.translate(cl, ct); 2585 if (scalingRequired) { 2586 // mAttachInfo cannot be null, otherwise scalingRequired == false 2587 final float scale = 1.0f / mAttachInfo.mApplicationScale; 2588 canvas.scale(scale, scale); 2589 } 2590 } 2591 2592 if (transformToApply != null || alpha < 1.0f || !child.hasIdentityMatrix()) { 2593 if (transformToApply != null || !childHasIdentityMatrix) { 2594 int transX = 0; 2595 int transY = 0; 2596 2597 if (offsetForScroll) { 2598 transX = -sx; 2599 transY = -sy; 2600 } 2601 2602 if (transformToApply != null) { 2603 if (concatMatrix) { 2604 // Undo the scroll translation, apply the transformation matrix, 2605 // then redo the scroll translate to get the correct result. 2606 canvas.translate(-transX, -transY); 2607 canvas.concat(transformToApply.getMatrix()); 2608 canvas.translate(transX, transY); 2609 mGroupFlags |= FLAG_CLEAR_TRANSFORMATION; 2610 } 2611 2612 float transformAlpha = transformToApply.getAlpha(); 2613 if (transformAlpha < 1.0f) { 2614 alpha *= transformToApply.getAlpha(); 2615 mGroupFlags |= FLAG_CLEAR_TRANSFORMATION; 2616 } 2617 } 2618 2619 if (!childHasIdentityMatrix) { 2620 canvas.translate(-transX, -transY); 2621 canvas.concat(child.getMatrix()); 2622 canvas.translate(transX, transY); 2623 } 2624 } 2625 2626 if (alpha < 1.0f) { 2627 mGroupFlags |= FLAG_CLEAR_TRANSFORMATION; 2628 if (hasNoCache) { 2629 final int multipliedAlpha = (int) (255 * alpha); 2630 if (!child.onSetAlpha(multipliedAlpha)) { 2631 int layerFlags = Canvas.HAS_ALPHA_LAYER_SAVE_FLAG; 2632 if ((flags & FLAG_CLIP_CHILDREN) == FLAG_CLIP_CHILDREN || 2633 layerType != LAYER_TYPE_NONE) { 2634 layerFlags |= Canvas.CLIP_TO_LAYER_SAVE_FLAG; 2635 } 2636 if (layerType == LAYER_TYPE_NONE) { 2637 final int scrollX = hasDisplayList ? 0 : sx; 2638 final int scrollY = hasDisplayList ? 0 : sy; 2639 canvas.saveLayerAlpha(scrollX, scrollY, scrollX + cr - cl, 2640 scrollY + cb - ct, multipliedAlpha, layerFlags); 2641 } 2642 } else { 2643 // Alpha is handled by the child directly, clobber the layer's alpha 2644 child.mPrivateFlags |= ALPHA_SET; 2645 } 2646 } 2647 } 2648 } else if ((child.mPrivateFlags & ALPHA_SET) == ALPHA_SET) { 2649 child.onSetAlpha(255); 2650 child.mPrivateFlags &= ~ALPHA_SET; 2651 } 2652 2653 if ((flags & FLAG_CLIP_CHILDREN) == FLAG_CLIP_CHILDREN) { 2654 if (offsetForScroll) { 2655 canvas.clipRect(sx, sy, sx + (cr - cl), sy + (cb - ct)); 2656 } else { 2657 if (!scalingRequired || cache == null) { 2658 canvas.clipRect(0, 0, cr - cl, cb - ct); 2659 } else { 2660 canvas.clipRect(0, 0, cache.getWidth(), cache.getHeight()); 2661 } 2662 } 2663 } 2664 2665 if (hasDisplayList) { 2666 displayList = child.getDisplayList(); 2667 } 2668 2669 if (hasNoCache) { 2670 boolean layerRendered = false; 2671 if (layerType == LAYER_TYPE_HARDWARE) { 2672 final HardwareLayer layer = child.getHardwareLayer(); 2673 if (layer != null && layer.isValid()) { 2674 child.mLayerPaint.setAlpha((int) (alpha * 255)); 2675 ((HardwareCanvas) canvas).drawHardwareLayer(layer, 0, 0, child.mLayerPaint); 2676 layerRendered = true; 2677 } else { 2678 final int scrollX = hasDisplayList ? 0 : sx; 2679 final int scrollY = hasDisplayList ? 0 : sy; 2680 canvas.saveLayer(scrollX, scrollY, 2681 scrollX + cr - cl, scrollY + cb - ct, child.mLayerPaint, 2682 Canvas.HAS_ALPHA_LAYER_SAVE_FLAG | Canvas.CLIP_TO_LAYER_SAVE_FLAG); 2683 } 2684 } 2685 2686 if (!layerRendered) { 2687 if (!hasDisplayList) { 2688 // Fast path for layouts with no backgrounds 2689 if ((child.mPrivateFlags & SKIP_DRAW) == SKIP_DRAW) { 2690 if (ViewDebug.TRACE_HIERARCHY) { 2691 ViewDebug.trace(this, ViewDebug.HierarchyTraceType.DRAW); 2692 } 2693 child.mPrivateFlags &= ~DIRTY_MASK; 2694 child.dispatchDraw(canvas); 2695 } else { 2696 child.draw(canvas); 2697 } 2698 } else { 2699 child.mPrivateFlags &= ~DIRTY_MASK; 2700 ((HardwareCanvas) canvas).drawDisplayList(displayList, cr - cl, cb - ct, null); 2701 } 2702 } 2703 } else if (cache != null) { 2704 child.mPrivateFlags &= ~DIRTY_MASK; 2705 Paint cachePaint; 2706 2707 if (layerType == LAYER_TYPE_NONE) { 2708 cachePaint = mCachePaint; 2709 if (alpha < 1.0f) { 2710 cachePaint.setAlpha((int) (alpha * 255)); 2711 mGroupFlags |= FLAG_ALPHA_LOWER_THAN_ONE; 2712 } else if ((flags & FLAG_ALPHA_LOWER_THAN_ONE) == FLAG_ALPHA_LOWER_THAN_ONE) { 2713 cachePaint.setAlpha(255); 2714 mGroupFlags &= ~FLAG_ALPHA_LOWER_THAN_ONE; 2715 } 2716 } else { 2717 cachePaint = child.mLayerPaint; 2718 cachePaint.setAlpha((int) (alpha * 255)); 2719 } 2720 canvas.drawBitmap(cache, 0.0f, 0.0f, cachePaint); 2721 } 2722 2723 canvas.restoreToCount(restoreTo); 2724 2725 if (a != null && !more) { 2726 if (!hardwareAccelerated && !a.getFillAfter()) { 2727 child.onSetAlpha(255); 2728 } 2729 finishAnimatingView(child, a); 2730 } 2731 2732 if (more && hardwareAccelerated) { 2733 // invalidation is the trigger to recreate display lists, so if we're using 2734 // display lists to render, force an invalidate to allow the animation to 2735 // continue drawing another frame 2736 invalidate(true); 2737 if (a instanceof AlphaAnimation) { 2738 // alpha animations should cause the child to recreate its display list 2739 child.invalidate(true); 2740 } 2741 } 2742 2743 child.mRecreateDisplayList = false; 2744 2745 return more; 2746 } 2747 2748 /** 2749 * 2750 * @param enabled True if children should be drawn with layers, false otherwise. 2751 * 2752 * @hide 2753 */ 2754 public void setChildrenLayersEnabled(boolean enabled) { 2755 if (enabled != mDrawLayers) { 2756 mDrawLayers = enabled; 2757 invalidate(true); 2758 2759 // We need to invalidate any child with a layer. For instance, 2760 // if a child is backed by a hardware layer and we disable layers 2761 // the child is marked as not dirty (flags cleared the last time 2762 // the child was drawn inside its layer.) However, that child might 2763 // never have created its own display list or have an obsolete 2764 // display list. By invalidating the child we ensure the display 2765 // list is in sync with the content of the hardware layer. 2766 for (int i = 0; i < mChildrenCount; i++) { 2767 View child = mChildren[i]; 2768 if (child.mLayerType != LAYER_TYPE_NONE) { 2769 child.invalidate(true); 2770 } 2771 } 2772 } 2773 } 2774 2775 /** 2776 * By default, children are clipped to their bounds before drawing. This 2777 * allows view groups to override this behavior for animations, etc. 2778 * 2779 * @param clipChildren true to clip children to their bounds, 2780 * false otherwise 2781 * @attr ref android.R.styleable#ViewGroup_clipChildren 2782 */ 2783 public void setClipChildren(boolean clipChildren) { 2784 setBooleanFlag(FLAG_CLIP_CHILDREN, clipChildren); 2785 } 2786 2787 /** 2788 * By default, children are clipped to the padding of the ViewGroup. This 2789 * allows view groups to override this behavior 2790 * 2791 * @param clipToPadding true to clip children to the padding of the 2792 * group, false otherwise 2793 * @attr ref android.R.styleable#ViewGroup_clipToPadding 2794 */ 2795 public void setClipToPadding(boolean clipToPadding) { 2796 setBooleanFlag(FLAG_CLIP_TO_PADDING, clipToPadding); 2797 } 2798 2799 /** 2800 * {@inheritDoc} 2801 */ 2802 @Override 2803 public void dispatchSetSelected(boolean selected) { 2804 final View[] children = mChildren; 2805 final int count = mChildrenCount; 2806 for (int i = 0; i < count; i++) { 2807 children[i].setSelected(selected); 2808 } 2809 } 2810 2811 /** 2812 * {@inheritDoc} 2813 */ 2814 @Override 2815 public void dispatchSetActivated(boolean activated) { 2816 final View[] children = mChildren; 2817 final int count = mChildrenCount; 2818 for (int i = 0; i < count; i++) { 2819 children[i].setActivated(activated); 2820 } 2821 } 2822 2823 @Override 2824 protected void dispatchSetPressed(boolean pressed) { 2825 final View[] children = mChildren; 2826 final int count = mChildrenCount; 2827 for (int i = 0; i < count; i++) { 2828 children[i].setPressed(pressed); 2829 } 2830 } 2831 2832 /** 2833 * When this property is set to true, this ViewGroup supports static transformations on 2834 * children; this causes 2835 * {@link #getChildStaticTransformation(View, android.view.animation.Transformation)} to be 2836 * invoked when a child is drawn. 2837 * 2838 * Any subclass overriding 2839 * {@link #getChildStaticTransformation(View, android.view.animation.Transformation)} should 2840 * set this property to true. 2841 * 2842 * @param enabled True to enable static transformations on children, false otherwise. 2843 * 2844 * @see #FLAG_SUPPORT_STATIC_TRANSFORMATIONS 2845 */ 2846 protected void setStaticTransformationsEnabled(boolean enabled) { 2847 setBooleanFlag(FLAG_SUPPORT_STATIC_TRANSFORMATIONS, enabled); 2848 } 2849 2850 /** 2851 * {@inheritDoc} 2852 * 2853 * @see #setStaticTransformationsEnabled(boolean) 2854 */ 2855 protected boolean getChildStaticTransformation(View child, Transformation t) { 2856 return false; 2857 } 2858 2859 /** 2860 * {@hide} 2861 */ 2862 @Override 2863 protected View findViewTraversal(int id) { 2864 if (id == mID) { 2865 return this; 2866 } 2867 2868 final View[] where = mChildren; 2869 final int len = mChildrenCount; 2870 2871 for (int i = 0; i < len; i++) { 2872 View v = where[i]; 2873 2874 if ((v.mPrivateFlags & IS_ROOT_NAMESPACE) == 0) { 2875 v = v.findViewById(id); 2876 2877 if (v != null) { 2878 return v; 2879 } 2880 } 2881 } 2882 2883 return null; 2884 } 2885 2886 /** 2887 * {@hide} 2888 */ 2889 @Override 2890 protected View findViewWithTagTraversal(Object tag) { 2891 if (tag != null && tag.equals(mTag)) { 2892 return this; 2893 } 2894 2895 final View[] where = mChildren; 2896 final int len = mChildrenCount; 2897 2898 for (int i = 0; i < len; i++) { 2899 View v = where[i]; 2900 2901 if ((v.mPrivateFlags & IS_ROOT_NAMESPACE) == 0) { 2902 v = v.findViewWithTag(tag); 2903 2904 if (v != null) { 2905 return v; 2906 } 2907 } 2908 } 2909 2910 return null; 2911 } 2912 2913 /** 2914 * {@hide} 2915 */ 2916 @Override 2917 protected View findViewByPredicateTraversal(Predicate<View> predicate) { 2918 if (predicate.apply(this)) { 2919 return this; 2920 } 2921 2922 final View[] where = mChildren; 2923 final int len = mChildrenCount; 2924 2925 for (int i = 0; i < len; i++) { 2926 View v = where[i]; 2927 2928 if ((v.mPrivateFlags & IS_ROOT_NAMESPACE) == 0) { 2929 v = v.findViewByPredicate(predicate); 2930 2931 if (v != null) { 2932 return v; 2933 } 2934 } 2935 } 2936 2937 return null; 2938 } 2939 2940 /** 2941 * Adds a child view. If no layout parameters are already set on the child, the 2942 * default parameters for this ViewGroup are set on the child. 2943 * 2944 * @param child the child view to add 2945 * 2946 * @see #generateDefaultLayoutParams() 2947 */ 2948 public void addView(View child) { 2949 addView(child, -1); 2950 } 2951 2952 /** 2953 * Adds a child view. If no layout parameters are already set on the child, the 2954 * default parameters for this ViewGroup are set on the child. 2955 * 2956 * @param child the child view to add 2957 * @param index the position at which to add the child 2958 * 2959 * @see #generateDefaultLayoutParams() 2960 */ 2961 public void addView(View child, int index) { 2962 LayoutParams params = child.getLayoutParams(); 2963 if (params == null) { 2964 params = generateDefaultLayoutParams(); 2965 if (params == null) { 2966 throw new IllegalArgumentException("generateDefaultLayoutParams() cannot return null"); 2967 } 2968 } 2969 addView(child, index, params); 2970 } 2971 2972 /** 2973 * Adds a child view with this ViewGroup's default layout parameters and the 2974 * specified width and height. 2975 * 2976 * @param child the child view to add 2977 */ 2978 public void addView(View child, int width, int height) { 2979 final LayoutParams params = generateDefaultLayoutParams(); 2980 params.width = width; 2981 params.height = height; 2982 addView(child, -1, params); 2983 } 2984 2985 /** 2986 * Adds a child view with the specified layout parameters. 2987 * 2988 * @param child the child view to add 2989 * @param params the layout parameters to set on the child 2990 */ 2991 public void addView(View child, LayoutParams params) { 2992 addView(child, -1, params); 2993 } 2994 2995 /** 2996 * Adds a child view with the specified layout parameters. 2997 * 2998 * @param child the child view to add 2999 * @param index the position at which to add the child 3000 * @param params the layout parameters to set on the child 3001 */ 3002 public void addView(View child, int index, LayoutParams params) { 3003 if (DBG) { 3004 System.out.println(this + " addView"); 3005 } 3006 3007 // addViewInner() will call child.requestLayout() when setting the new LayoutParams 3008 // therefore, we call requestLayout() on ourselves before, so that the child's request 3009 // will be blocked at our level 3010 requestLayout(); 3011 invalidate(true); 3012 addViewInner(child, index, params, false); 3013 } 3014 3015 /** 3016 * {@inheritDoc} 3017 */ 3018 public void updateViewLayout(View view, ViewGroup.LayoutParams params) { 3019 if (!checkLayoutParams(params)) { 3020 throw new IllegalArgumentException("Invalid LayoutParams supplied to " + this); 3021 } 3022 if (view.mParent != this) { 3023 throw new IllegalArgumentException("Given view not a child of " + this); 3024 } 3025 view.setLayoutParams(params); 3026 } 3027 3028 /** 3029 * {@inheritDoc} 3030 */ 3031 protected boolean checkLayoutParams(ViewGroup.LayoutParams p) { 3032 return p != null; 3033 } 3034 3035 /** 3036 * Interface definition for a callback to be invoked when the hierarchy 3037 * within this view changed. The hierarchy changes whenever a child is added 3038 * to or removed from this view. 3039 */ 3040 public interface OnHierarchyChangeListener { 3041 /** 3042 * Called when a new child is added to a parent view. 3043 * 3044 * @param parent the view in which a child was added 3045 * @param child the new child view added in the hierarchy 3046 */ 3047 void onChildViewAdded(View parent, View child); 3048 3049 /** 3050 * Called when a child is removed from a parent view. 3051 * 3052 * @param parent the view from which the child was removed 3053 * @param child the child removed from the hierarchy 3054 */ 3055 void onChildViewRemoved(View parent, View child); 3056 } 3057 3058 /** 3059 * Register a callback to be invoked when a child is added to or removed 3060 * from this view. 3061 * 3062 * @param listener the callback to invoke on hierarchy change 3063 */ 3064 public void setOnHierarchyChangeListener(OnHierarchyChangeListener listener) { 3065 mOnHierarchyChangeListener = listener; 3066 } 3067 3068 /** 3069 * Adds a view during layout. This is useful if in your onLayout() method, 3070 * you need to add more views (as does the list view for example). 3071 * 3072 * If index is negative, it means put it at the end of the list. 3073 * 3074 * @param child the view to add to the group 3075 * @param index the index at which the child must be added 3076 * @param params the layout parameters to associate with the child 3077 * @return true if the child was added, false otherwise 3078 */ 3079 protected boolean addViewInLayout(View child, int index, LayoutParams params) { 3080 return addViewInLayout(child, index, params, false); 3081 } 3082 3083 /** 3084 * Adds a view during layout. This is useful if in your onLayout() method, 3085 * you need to add more views (as does the list view for example). 3086 * 3087 * If index is negative, it means put it at the end of the list. 3088 * 3089 * @param child the view to add to the group 3090 * @param index the index at which the child must be added 3091 * @param params the layout parameters to associate with the child 3092 * @param preventRequestLayout if true, calling this method will not trigger a 3093 * layout request on child 3094 * @return true if the child was added, false otherwise 3095 */ 3096 protected boolean addViewInLayout(View child, int index, LayoutParams params, 3097 boolean preventRequestLayout) { 3098 child.mParent = null; 3099 addViewInner(child, index, params, preventRequestLayout); 3100 child.mPrivateFlags = (child.mPrivateFlags & ~DIRTY_MASK) | DRAWN; 3101 return true; 3102 } 3103 3104 /** 3105 * Prevents the specified child to be laid out during the next layout pass. 3106 * 3107 * @param child the child on which to perform the cleanup 3108 */ 3109 protected void cleanupLayoutState(View child) { 3110 child.mPrivateFlags &= ~View.FORCE_LAYOUT; 3111 } 3112 3113 private void addViewInner(View child, int index, LayoutParams params, 3114 boolean preventRequestLayout) { 3115 3116 if (mTransition != null) { 3117 // Don't prevent other add transitions from completing, but cancel remove 3118 // transitions to let them complete the process before we add to the container 3119 mTransition.cancel(LayoutTransition.DISAPPEARING); 3120 } 3121 3122 if (child.getParent() != null) { 3123 throw new IllegalStateException("The specified child already has a parent. " + 3124 "You must call removeView() on the child's parent first."); 3125 } 3126 3127 if (mTransition != null) { 3128 mTransition.addChild(this, child); 3129 } 3130 3131 if (!checkLayoutParams(params)) { 3132 params = generateLayoutParams(params); 3133 } 3134 3135 if (preventRequestLayout) { 3136 child.mLayoutParams = params; 3137 } else { 3138 child.setLayoutParams(params); 3139 } 3140 3141 if (index < 0) { 3142 index = mChildrenCount; 3143 } 3144 3145 addInArray(child, index); 3146 3147 // tell our children 3148 if (preventRequestLayout) { 3149 child.assignParent(this); 3150 } else { 3151 child.mParent = this; 3152 } 3153 3154 if (child.hasFocus()) { 3155 requestChildFocus(child, child.findFocus()); 3156 } 3157 3158 AttachInfo ai = mAttachInfo; 3159 if (ai != null) { 3160 boolean lastKeepOn = ai.mKeepScreenOn; 3161 ai.mKeepScreenOn = false; 3162 child.dispatchAttachedToWindow(mAttachInfo, (mViewFlags&VISIBILITY_MASK)); 3163 if (ai.mKeepScreenOn) { 3164 needGlobalAttributesUpdate(true); 3165 } 3166 ai.mKeepScreenOn = lastKeepOn; 3167 } 3168 3169 if (mOnHierarchyChangeListener != null) { 3170 mOnHierarchyChangeListener.onChildViewAdded(this, child); 3171 } 3172 3173 if ((child.mViewFlags & DUPLICATE_PARENT_STATE) == DUPLICATE_PARENT_STATE) { 3174 mGroupFlags |= FLAG_NOTIFY_CHILDREN_ON_DRAWABLE_STATE_CHANGE; 3175 } 3176 } 3177 3178 private void addInArray(View child, int index) { 3179 View[] children = mChildren; 3180 final int count = mChildrenCount; 3181 final int size = children.length; 3182 if (index == count) { 3183 if (size == count) { 3184 mChildren = new View[size + ARRAY_CAPACITY_INCREMENT]; 3185 System.arraycopy(children, 0, mChildren, 0, size); 3186 children = mChildren; 3187 } 3188 children[mChildrenCount++] = child; 3189 } else if (index < count) { 3190 if (size == count) { 3191 mChildren = new View[size + ARRAY_CAPACITY_INCREMENT]; 3192 System.arraycopy(children, 0, mChildren, 0, index); 3193 System.arraycopy(children, index, mChildren, index + 1, count - index); 3194 children = mChildren; 3195 } else { 3196 System.arraycopy(children, index, children, index + 1, count - index); 3197 } 3198 children[index] = child; 3199 mChildrenCount++; 3200 if (mLastTouchDownIndex >= index) { 3201 mLastTouchDownIndex++; 3202 } 3203 } else { 3204 throw new IndexOutOfBoundsException("index=" + index + " count=" + count); 3205 } 3206 } 3207 3208 // This method also sets the child's mParent to null 3209 private void removeFromArray(int index) { 3210 final View[] children = mChildren; 3211 if (!(mTransitioningViews != null && mTransitioningViews.contains(children[index]))) { 3212 children[index].mParent = null; 3213 } 3214 final int count = mChildrenCount; 3215 if (index == count - 1) { 3216 children[--mChildrenCount] = null; 3217 } else if (index >= 0 && index < count) { 3218 System.arraycopy(children, index + 1, children, index, count - index - 1); 3219 children[--mChildrenCount] = null; 3220 } else { 3221 throw new IndexOutOfBoundsException(); 3222 } 3223 if (mLastTouchDownIndex == index) { 3224 mLastTouchDownTime = 0; 3225 mLastTouchDownIndex = -1; 3226 } else if (mLastTouchDownIndex > index) { 3227 mLastTouchDownIndex--; 3228 } 3229 } 3230 3231 // This method also sets the children's mParent to null 3232 private void removeFromArray(int start, int count) { 3233 final View[] children = mChildren; 3234 final int childrenCount = mChildrenCount; 3235 3236 start = Math.max(0, start); 3237 final int end = Math.min(childrenCount, start + count); 3238 3239 if (start == end) { 3240 return; 3241 } 3242 3243 if (end == childrenCount) { 3244 for (int i = start; i < end; i++) { 3245 children[i].mParent = null; 3246 children[i] = null; 3247 } 3248 } else { 3249 for (int i = start; i < end; i++) { 3250 children[i].mParent = null; 3251 } 3252 3253 // Since we're looping above, we might as well do the copy, but is arraycopy() 3254 // faster than the extra 2 bounds checks we would do in the loop? 3255 System.arraycopy(children, end, children, start, childrenCount - end); 3256 3257 for (int i = childrenCount - (end - start); i < childrenCount; i++) { 3258 children[i] = null; 3259 } 3260 } 3261 3262 mChildrenCount -= (end - start); 3263 } 3264 3265 private void bindLayoutAnimation(View child) { 3266 Animation a = mLayoutAnimationController.getAnimationForView(child); 3267 child.setAnimation(a); 3268 } 3269 3270 /** 3271 * Subclasses should override this method to set layout animation 3272 * parameters on the supplied child. 3273 * 3274 * @param child the child to associate with animation parameters 3275 * @param params the child's layout parameters which hold the animation 3276 * parameters 3277 * @param index the index of the child in the view group 3278 * @param count the number of children in the view group 3279 */ 3280 protected void attachLayoutAnimationParameters(View child, 3281 LayoutParams params, int index, int count) { 3282 LayoutAnimationController.AnimationParameters animationParams = 3283 params.layoutAnimationParameters; 3284 if (animationParams == null) { 3285 animationParams = new LayoutAnimationController.AnimationParameters(); 3286 params.layoutAnimationParameters = animationParams; 3287 } 3288 3289 animationParams.count = count; 3290 animationParams.index = index; 3291 } 3292 3293 /** 3294 * {@inheritDoc} 3295 */ 3296 public void removeView(View view) { 3297 removeViewInternal(view); 3298 requestLayout(); 3299 invalidate(true); 3300 } 3301 3302 /** 3303 * Removes a view during layout. This is useful if in your onLayout() method, 3304 * you need to remove more views. 3305 * 3306 * @param view the view to remove from the group 3307 */ 3308 public void removeViewInLayout(View view) { 3309 removeViewInternal(view); 3310 } 3311 3312 /** 3313 * Removes a range of views during layout. This is useful if in your onLayout() method, 3314 * you need to remove more views. 3315 * 3316 * @param start the index of the first view to remove from the group 3317 * @param count the number of views to remove from the group 3318 */ 3319 public void removeViewsInLayout(int start, int count) { 3320 removeViewsInternal(start, count); 3321 } 3322 3323 /** 3324 * Removes the view at the specified position in the group. 3325 * 3326 * @param index the position in the group of the view to remove 3327 */ 3328 public void removeViewAt(int index) { 3329 removeViewInternal(index, getChildAt(index)); 3330 requestLayout(); 3331 invalidate(true); 3332 } 3333 3334 /** 3335 * Removes the specified range of views from the group. 3336 * 3337 * @param start the first position in the group of the range of views to remove 3338 * @param count the number of views to remove 3339 */ 3340 public void removeViews(int start, int count) { 3341 removeViewsInternal(start, count); 3342 requestLayout(); 3343 invalidate(true); 3344 } 3345 3346 private void removeViewInternal(View view) { 3347 final int index = indexOfChild(view); 3348 if (index >= 0) { 3349 removeViewInternal(index, view); 3350 } 3351 } 3352 3353 private void removeViewInternal(int index, View view) { 3354 3355 if (mTransition != null) { 3356 mTransition.removeChild(this, view); 3357 } 3358 3359 if (view == mHoveredChild) { 3360 mHoveredChild = null; 3361 } 3362 3363 boolean clearChildFocus = false; 3364 if (view == mFocused) { 3365 view.clearFocusForRemoval(); 3366 clearChildFocus = true; 3367 } 3368 3369 if (view.getAnimation() != null || 3370 (mTransitioningViews != null && mTransitioningViews.contains(view))) { 3371 addDisappearingView(view); 3372 } else if (view.mAttachInfo != null) { 3373 view.dispatchDetachedFromWindow(); 3374 } 3375 3376 if (mOnHierarchyChangeListener != null) { 3377 mOnHierarchyChangeListener.onChildViewRemoved(this, view); 3378 } 3379 3380 needGlobalAttributesUpdate(false); 3381 3382 removeFromArray(index); 3383 3384 if (clearChildFocus) { 3385 clearChildFocus(view); 3386 } 3387 } 3388 3389 /** 3390 * Sets the LayoutTransition object for this ViewGroup. If the LayoutTransition object is 3391 * not null, changes in layout which occur because of children being added to or removed from 3392 * the ViewGroup will be animated according to the animations defined in that LayoutTransition 3393 * object. By default, the transition object is null (so layout changes are not animated). 3394 * 3395 * @param transition The LayoutTransition object that will animated changes in layout. A value 3396 * of <code>null</code> means no transition will run on layout changes. 3397 * @attr ref android.R.styleable#ViewGroup_animateLayoutChanges 3398 */ 3399 public void setLayoutTransition(LayoutTransition transition) { 3400 if (mTransition != null) { 3401 mTransition.removeTransitionListener(mLayoutTransitionListener); 3402 } 3403 mTransition = transition; 3404 if (mTransition != null) { 3405 mTransition.addTransitionListener(mLayoutTransitionListener); 3406 } 3407 } 3408 3409 /** 3410 * Gets the LayoutTransition object for this ViewGroup. If the LayoutTransition object is 3411 * not null, changes in layout which occur because of children being added to or removed from 3412 * the ViewGroup will be animated according to the animations defined in that LayoutTransition 3413 * object. By default, the transition object is null (so layout changes are not animated). 3414 * 3415 * @return LayoutTranstion The LayoutTransition object that will animated changes in layout. 3416 * A value of <code>null</code> means no transition will run on layout changes. 3417 */ 3418 public LayoutTransition getLayoutTransition() { 3419 return mTransition; 3420 } 3421 3422 private void removeViewsInternal(int start, int count) { 3423 final OnHierarchyChangeListener onHierarchyChangeListener = mOnHierarchyChangeListener; 3424 final boolean notifyListener = onHierarchyChangeListener != null; 3425 final View focused = mFocused; 3426 final View hoveredChild = mHoveredChild; 3427 final boolean detach = mAttachInfo != null; 3428 View clearChildFocus = null; 3429 3430 final View[] children = mChildren; 3431 final int end = start + count; 3432 3433 for (int i = start; i < end; i++) { 3434 final View view = children[i]; 3435 3436 if (mTransition != null) { 3437 mTransition.removeChild(this, view); 3438 } 3439 3440 if (view == hoveredChild) { 3441 mHoveredChild = null; 3442 } 3443 3444 if (view == focused) { 3445 view.clearFocusForRemoval(); 3446 clearChildFocus = view; 3447 } 3448 3449 if (view.getAnimation() != null || 3450 (mTransitioningViews != null && mTransitioningViews.contains(view))) { 3451 addDisappearingView(view); 3452 } else if (detach) { 3453 view.dispatchDetachedFromWindow(); 3454 } 3455 3456 needGlobalAttributesUpdate(false); 3457 3458 if (notifyListener) { 3459 onHierarchyChangeListener.onChildViewRemoved(this, view); 3460 } 3461 } 3462 3463 removeFromArray(start, count); 3464 3465 if (clearChildFocus != null) { 3466 clearChildFocus(clearChildFocus); 3467 } 3468 } 3469 3470 /** 3471 * Call this method to remove all child views from the 3472 * ViewGroup. 3473 */ 3474 public void removeAllViews() { 3475 removeAllViewsInLayout(); 3476 requestLayout(); 3477 invalidate(true); 3478 } 3479 3480 /** 3481 * Called by a ViewGroup subclass to remove child views from itself, 3482 * when it must first know its size on screen before it can calculate how many 3483 * child views it will render. An example is a Gallery or a ListView, which 3484 * may "have" 50 children, but actually only render the number of children 3485 * that can currently fit inside the object on screen. Do not call 3486 * this method unless you are extending ViewGroup and understand the 3487 * view measuring and layout pipeline. 3488 */ 3489 public void removeAllViewsInLayout() { 3490 final int count = mChildrenCount; 3491 if (count <= 0) { 3492 return; 3493 } 3494 3495 final View[] children = mChildren; 3496 mChildrenCount = 0; 3497 3498 final OnHierarchyChangeListener listener = mOnHierarchyChangeListener; 3499 final boolean notify = listener != null; 3500 final View focused = mFocused; 3501 final View hoveredChild = mHoveredChild; 3502 final boolean detach = mAttachInfo != null; 3503 View clearChildFocus = null; 3504 3505 needGlobalAttributesUpdate(false); 3506 3507 for (int i = count - 1; i >= 0; i--) { 3508 final View view = children[i]; 3509 3510 if (mTransition != null) { 3511 mTransition.removeChild(this, view); 3512 } 3513 3514 if (view == hoveredChild) { 3515 mHoveredChild = null; 3516 } 3517 3518 if (view == focused) { 3519 view.clearFocusForRemoval(); 3520 clearChildFocus = view; 3521 } 3522 3523 if (view.getAnimation() != null || 3524 (mTransitioningViews != null && mTransitioningViews.contains(view))) { 3525 addDisappearingView(view); 3526 } else if (detach) { 3527 view.dispatchDetachedFromWindow(); 3528 } 3529 3530 if (notify) { 3531 listener.onChildViewRemoved(this, view); 3532 } 3533 3534 view.mParent = null; 3535 children[i] = null; 3536 } 3537 3538 if (clearChildFocus != null) { 3539 clearChildFocus(clearChildFocus); 3540 } 3541 } 3542 3543 /** 3544 * Finishes the removal of a detached view. This method will dispatch the detached from 3545 * window event and notify the hierarchy change listener. 3546 * 3547 * @param child the child to be definitely removed from the view hierarchy 3548 * @param animate if true and the view has an animation, the view is placed in the 3549 * disappearing views list, otherwise, it is detached from the window 3550 * 3551 * @see #attachViewToParent(View, int, android.view.ViewGroup.LayoutParams) 3552 * @see #detachAllViewsFromParent() 3553 * @see #detachViewFromParent(View) 3554 * @see #detachViewFromParent(int) 3555 */ 3556 protected void removeDetachedView(View child, boolean animate) { 3557 if (mTransition != null) { 3558 mTransition.removeChild(this, child); 3559 } 3560 3561 if (child == mFocused) { 3562 child.clearFocus(); 3563 } 3564 3565 if ((animate && child.getAnimation() != null) || 3566 (mTransitioningViews != null && mTransitioningViews.contains(child))) { 3567 addDisappearingView(child); 3568 } else if (child.mAttachInfo != null) { 3569 child.dispatchDetachedFromWindow(); 3570 } 3571 3572 if (mOnHierarchyChangeListener != null) { 3573 mOnHierarchyChangeListener.onChildViewRemoved(this, child); 3574 } 3575 } 3576 3577 /** 3578 * Attaches a view to this view group. Attaching a view assigns this group as the parent, 3579 * sets the layout parameters and puts the view in the list of children so it can be retrieved 3580 * by calling {@link #getChildAt(int)}. 3581 * 3582 * This method should be called only for view which were detached from their parent. 3583 * 3584 * @param child the child to attach 3585 * @param index the index at which the child should be attached 3586 * @param params the layout parameters of the child 3587 * 3588 * @see #removeDetachedView(View, boolean) 3589 * @see #detachAllViewsFromParent() 3590 * @see #detachViewFromParent(View) 3591 * @see #detachViewFromParent(int) 3592 */ 3593 protected void attachViewToParent(View child, int index, LayoutParams params) { 3594 child.mLayoutParams = params; 3595 3596 if (index < 0) { 3597 index = mChildrenCount; 3598 } 3599 3600 addInArray(child, index); 3601 3602 child.mParent = this; 3603 child.mPrivateFlags = (child.mPrivateFlags & ~DIRTY_MASK & ~DRAWING_CACHE_VALID) | 3604 DRAWN | INVALIDATED; 3605 this.mPrivateFlags |= INVALIDATED; 3606 3607 if (child.hasFocus()) { 3608 requestChildFocus(child, child.findFocus()); 3609 } 3610 } 3611 3612 /** 3613 * Detaches a view from its parent. Detaching a view should be temporary and followed 3614 * either by a call to {@link #attachViewToParent(View, int, android.view.ViewGroup.LayoutParams)} 3615 * or a call to {@link #removeDetachedView(View, boolean)}. When a view is detached, 3616 * its parent is null and cannot be retrieved by a call to {@link #getChildAt(int)}. 3617 * 3618 * @param child the child to detach 3619 * 3620 * @see #detachViewFromParent(int) 3621 * @see #detachViewsFromParent(int, int) 3622 * @see #detachAllViewsFromParent() 3623 * @see #attachViewToParent(View, int, android.view.ViewGroup.LayoutParams) 3624 * @see #removeDetachedView(View, boolean) 3625 */ 3626 protected void detachViewFromParent(View child) { 3627 removeFromArray(indexOfChild(child)); 3628 } 3629 3630 /** 3631 * Detaches a view from its parent. Detaching a view should be temporary and followed 3632 * either by a call to {@link #attachViewToParent(View, int, android.view.ViewGroup.LayoutParams)} 3633 * or a call to {@link #removeDetachedView(View, boolean)}. When a view is detached, 3634 * its parent is null and cannot be retrieved by a call to {@link #getChildAt(int)}. 3635 * 3636 * @param index the index of the child to detach 3637 * 3638 * @see #detachViewFromParent(View) 3639 * @see #detachAllViewsFromParent() 3640 * @see #detachViewsFromParent(int, int) 3641 * @see #attachViewToParent(View, int, android.view.ViewGroup.LayoutParams) 3642 * @see #removeDetachedView(View, boolean) 3643 */ 3644 protected void detachViewFromParent(int index) { 3645 removeFromArray(index); 3646 } 3647 3648 /** 3649 * Detaches a range of view from their parent. Detaching a view should be temporary and followed 3650 * either by a call to {@link #attachViewToParent(View, int, android.view.ViewGroup.LayoutParams)} 3651 * or a call to {@link #removeDetachedView(View, boolean)}. When a view is detached, its 3652 * parent is null and cannot be retrieved by a call to {@link #getChildAt(int)}. 3653 * 3654 * @param start the first index of the childrend range to detach 3655 * @param count the number of children to detach 3656 * 3657 * @see #detachViewFromParent(View) 3658 * @see #detachViewFromParent(int) 3659 * @see #detachAllViewsFromParent() 3660 * @see #attachViewToParent(View, int, android.view.ViewGroup.LayoutParams) 3661 * @see #removeDetachedView(View, boolean) 3662 */ 3663 protected void detachViewsFromParent(int start, int count) { 3664 removeFromArray(start, count); 3665 } 3666 3667 /** 3668 * Detaches all views from the parent. Detaching a view should be temporary and followed 3669 * either by a call to {@link #attachViewToParent(View, int, android.view.ViewGroup.LayoutParams)} 3670 * or a call to {@link #removeDetachedView(View, boolean)}. When a view is detached, 3671 * its parent is null and cannot be retrieved by a call to {@link #getChildAt(int)}. 3672 * 3673 * @see #detachViewFromParent(View) 3674 * @see #detachViewFromParent(int) 3675 * @see #detachViewsFromParent(int, int) 3676 * @see #attachViewToParent(View, int, android.view.ViewGroup.LayoutParams) 3677 * @see #removeDetachedView(View, boolean) 3678 */ 3679 protected void detachAllViewsFromParent() { 3680 final int count = mChildrenCount; 3681 if (count <= 0) { 3682 return; 3683 } 3684 3685 final View[] children = mChildren; 3686 mChildrenCount = 0; 3687 3688 for (int i = count - 1; i >= 0; i--) { 3689 children[i].mParent = null; 3690 children[i] = null; 3691 } 3692 } 3693 3694 /** 3695 * Don't call or override this method. It is used for the implementation of 3696 * the view hierarchy. 3697 */ 3698 public final void invalidateChild(View child, final Rect dirty) { 3699 if (ViewDebug.TRACE_HIERARCHY) { 3700 ViewDebug.trace(this, ViewDebug.HierarchyTraceType.INVALIDATE_CHILD); 3701 } 3702 3703 ViewParent parent = this; 3704 3705 final AttachInfo attachInfo = mAttachInfo; 3706 if (attachInfo != null) { 3707 // If the child is drawing an animation, we want to copy this flag onto 3708 // ourselves and the parent to make sure the invalidate request goes 3709 // through 3710 final boolean drawAnimation = (child.mPrivateFlags & DRAW_ANIMATION) == DRAW_ANIMATION; 3711 3712 if (dirty == null) { 3713 if (child.mLayerType != LAYER_TYPE_NONE) { 3714 mPrivateFlags |= INVALIDATED; 3715 mPrivateFlags &= ~DRAWING_CACHE_VALID; 3716 child.mLocalDirtyRect.setEmpty(); 3717 } 3718 do { 3719 View view = null; 3720 if (parent instanceof View) { 3721 view = (View) parent; 3722 if (view.mLayerType != LAYER_TYPE_NONE) { 3723 view.mLocalDirtyRect.setEmpty(); 3724 if (view.getParent() instanceof View) { 3725 final View grandParent = (View) view.getParent(); 3726 grandParent.mPrivateFlags |= INVALIDATED; 3727 grandParent.mPrivateFlags &= ~DRAWING_CACHE_VALID; 3728 } 3729 } 3730 if ((view.mPrivateFlags & DIRTY_MASK) != 0) { 3731 // already marked dirty - we're done 3732 break; 3733 } 3734 } 3735 3736 if (drawAnimation) { 3737 if (view != null) { 3738 view.mPrivateFlags |= DRAW_ANIMATION; 3739 } else if (parent instanceof ViewRoot) { 3740 ((ViewRoot) parent).mIsAnimating = true; 3741 } 3742 } 3743 3744 if (parent instanceof ViewRoot) { 3745 ((ViewRoot) parent).invalidate(); 3746 parent = null; 3747 } else if (view != null) { 3748 if ((view.mPrivateFlags & DRAWN) == DRAWN || 3749 (view.mPrivateFlags & DRAWING_CACHE_VALID) == DRAWING_CACHE_VALID) { 3750 view.mPrivateFlags &= ~DRAWING_CACHE_VALID; 3751 view.mPrivateFlags |= DIRTY; 3752 parent = view.mParent; 3753 } else { 3754 parent = null; 3755 } 3756 } 3757 } while (parent != null); 3758 } else { 3759 // Check whether the child that requests the invalidate is fully opaque 3760 final boolean isOpaque = child.isOpaque() && !drawAnimation && 3761 child.getAnimation() == null; 3762 // Mark the child as dirty, using the appropriate flag 3763 // Make sure we do not set both flags at the same time 3764 int opaqueFlag = isOpaque ? DIRTY_OPAQUE : DIRTY; 3765 3766 if (child.mLayerType != LAYER_TYPE_NONE) { 3767 mPrivateFlags |= INVALIDATED; 3768 mPrivateFlags &= ~DRAWING_CACHE_VALID; 3769 child.mLocalDirtyRect.union(dirty); 3770 } 3771 3772 final int[] location = attachInfo.mInvalidateChildLocation; 3773 location[CHILD_LEFT_INDEX] = child.mLeft; 3774 location[CHILD_TOP_INDEX] = child.mTop; 3775 Matrix childMatrix = child.getMatrix(); 3776 if (!childMatrix.isIdentity()) { 3777 RectF boundingRect = attachInfo.mTmpTransformRect; 3778 boundingRect.set(dirty); 3779 childMatrix.mapRect(boundingRect); 3780 dirty.set((int) boundingRect.left, (int) boundingRect.top, 3781 (int) (boundingRect.right + 0.5f), 3782 (int) (boundingRect.bottom + 0.5f)); 3783 } 3784 3785 do { 3786 View view = null; 3787 if (parent instanceof View) { 3788 view = (View) parent; 3789 if (view.mLayerType != LAYER_TYPE_NONE && 3790 view.getParent() instanceof View) { 3791 final View grandParent = (View) view.getParent(); 3792 grandParent.mPrivateFlags |= INVALIDATED; 3793 grandParent.mPrivateFlags &= ~DRAWING_CACHE_VALID; 3794 } 3795 } 3796 3797 if (drawAnimation) { 3798 if (view != null) { 3799 view.mPrivateFlags |= DRAW_ANIMATION; 3800 } else if (parent instanceof ViewRoot) { 3801 ((ViewRoot) parent).mIsAnimating = true; 3802 } 3803 } 3804 3805 // If the parent is dirty opaque or not dirty, mark it dirty with the opaque 3806 // flag coming from the child that initiated the invalidate 3807 if (view != null) { 3808 if ((view.mViewFlags & FADING_EDGE_MASK) != 0 && 3809 view.getSolidColor() == 0) { 3810 opaqueFlag = DIRTY; 3811 } 3812 if ((view.mPrivateFlags & DIRTY_MASK) != DIRTY) { 3813 view.mPrivateFlags = (view.mPrivateFlags & ~DIRTY_MASK) | opaqueFlag; 3814 } 3815 } 3816 3817 parent = parent.invalidateChildInParent(location, dirty); 3818 if (view != null) { 3819 // Account for transform on current parent 3820 Matrix m = view.getMatrix(); 3821 if (!m.isIdentity()) { 3822 RectF boundingRect = attachInfo.mTmpTransformRect; 3823 boundingRect.set(dirty); 3824 m.mapRect(boundingRect); 3825 dirty.set((int) boundingRect.left, (int) boundingRect.top, 3826 (int) (boundingRect.right + 0.5f), 3827 (int) (boundingRect.bottom + 0.5f)); 3828 } 3829 } 3830 } while (parent != null); 3831 } 3832 } 3833 } 3834 3835 /** 3836 * Don't call or override this method. It is used for the implementation of 3837 * the view hierarchy. 3838 * 3839 * This implementation returns null if this ViewGroup does not have a parent, 3840 * if this ViewGroup is already fully invalidated or if the dirty rectangle 3841 * does not intersect with this ViewGroup's bounds. 3842 */ 3843 public ViewParent invalidateChildInParent(final int[] location, final Rect dirty) { 3844 if (ViewDebug.TRACE_HIERARCHY) { 3845 ViewDebug.trace(this, ViewDebug.HierarchyTraceType.INVALIDATE_CHILD_IN_PARENT); 3846 } 3847 3848 if ((mPrivateFlags & DRAWN) == DRAWN || 3849 (mPrivateFlags & DRAWING_CACHE_VALID) == DRAWING_CACHE_VALID) { 3850 if ((mGroupFlags & (FLAG_OPTIMIZE_INVALIDATE | FLAG_ANIMATION_DONE)) != 3851 FLAG_OPTIMIZE_INVALIDATE) { 3852 dirty.offset(location[CHILD_LEFT_INDEX] - mScrollX, 3853 location[CHILD_TOP_INDEX] - mScrollY); 3854 3855 final int left = mLeft; 3856 final int top = mTop; 3857 3858 if (dirty.intersect(0, 0, mRight - left, mBottom - top) || 3859 (mPrivateFlags & DRAW_ANIMATION) == DRAW_ANIMATION) { 3860 mPrivateFlags &= ~DRAWING_CACHE_VALID; 3861 3862 location[CHILD_LEFT_INDEX] = left; 3863 location[CHILD_TOP_INDEX] = top; 3864 3865 if (mLayerType != LAYER_TYPE_NONE) { 3866 mLocalDirtyRect.union(dirty); 3867 } 3868 3869 return mParent; 3870 } 3871 } else { 3872 mPrivateFlags &= ~DRAWN & ~DRAWING_CACHE_VALID; 3873 3874 location[CHILD_LEFT_INDEX] = mLeft; 3875 location[CHILD_TOP_INDEX] = mTop; 3876 3877 dirty.set(0, 0, mRight - mLeft, mBottom - mTop); 3878 3879 if (mLayerType != LAYER_TYPE_NONE) { 3880 mLocalDirtyRect.union(dirty); 3881 } 3882 3883 return mParent; 3884 } 3885 } 3886 3887 return null; 3888 } 3889 3890 /** 3891 * Offset a rectangle that is in a descendant's coordinate 3892 * space into our coordinate space. 3893 * @param descendant A descendant of this view 3894 * @param rect A rectangle defined in descendant's coordinate space. 3895 */ 3896 public final void offsetDescendantRectToMyCoords(View descendant, Rect rect) { 3897 offsetRectBetweenParentAndChild(descendant, rect, true, false); 3898 } 3899 3900 /** 3901 * Offset a rectangle that is in our coordinate space into an ancestor's 3902 * coordinate space. 3903 * @param descendant A descendant of this view 3904 * @param rect A rectangle defined in descendant's coordinate space. 3905 */ 3906 public final void offsetRectIntoDescendantCoords(View descendant, Rect rect) { 3907 offsetRectBetweenParentAndChild(descendant, rect, false, false); 3908 } 3909 3910 /** 3911 * Helper method that offsets a rect either from parent to descendant or 3912 * descendant to parent. 3913 */ 3914 void offsetRectBetweenParentAndChild(View descendant, Rect rect, 3915 boolean offsetFromChildToParent, boolean clipToBounds) { 3916 3917 // already in the same coord system :) 3918 if (descendant == this) { 3919 return; 3920 } 3921 3922 ViewParent theParent = descendant.mParent; 3923 3924 // search and offset up to the parent 3925 while ((theParent != null) 3926 && (theParent instanceof View) 3927 && (theParent != this)) { 3928 3929 if (offsetFromChildToParent) { 3930 rect.offset(descendant.mLeft - descendant.mScrollX, 3931 descendant.mTop - descendant.mScrollY); 3932 if (clipToBounds) { 3933 View p = (View) theParent; 3934 rect.intersect(0, 0, p.mRight - p.mLeft, p.mBottom - p.mTop); 3935 } 3936 } else { 3937 if (clipToBounds) { 3938 View p = (View) theParent; 3939 rect.intersect(0, 0, p.mRight - p.mLeft, p.mBottom - p.mTop); 3940 } 3941 rect.offset(descendant.mScrollX - descendant.mLeft, 3942 descendant.mScrollY - descendant.mTop); 3943 } 3944 3945 descendant = (View) theParent; 3946 theParent = descendant.mParent; 3947 } 3948 3949 // now that we are up to this view, need to offset one more time 3950 // to get into our coordinate space 3951 if (theParent == this) { 3952 if (offsetFromChildToParent) { 3953 rect.offset(descendant.mLeft - descendant.mScrollX, 3954 descendant.mTop - descendant.mScrollY); 3955 } else { 3956 rect.offset(descendant.mScrollX - descendant.mLeft, 3957 descendant.mScrollY - descendant.mTop); 3958 } 3959 } else { 3960 throw new IllegalArgumentException("parameter must be a descendant of this view"); 3961 } 3962 } 3963 3964 /** 3965 * Offset the vertical location of all children of this view by the specified number of pixels. 3966 * 3967 * @param offset the number of pixels to offset 3968 * 3969 * @hide 3970 */ 3971 public void offsetChildrenTopAndBottom(int offset) { 3972 final int count = mChildrenCount; 3973 final View[] children = mChildren; 3974 3975 for (int i = 0; i < count; i++) { 3976 final View v = children[i]; 3977 v.mTop += offset; 3978 v.mBottom += offset; 3979 } 3980 } 3981 3982 /** 3983 * {@inheritDoc} 3984 */ 3985 public boolean getChildVisibleRect(View child, Rect r, android.graphics.Point offset) { 3986 int dx = child.mLeft - mScrollX; 3987 int dy = child.mTop - mScrollY; 3988 if (offset != null) { 3989 offset.x += dx; 3990 offset.y += dy; 3991 } 3992 r.offset(dx, dy); 3993 return r.intersect(0, 0, mRight - mLeft, mBottom - mTop) && 3994 (mParent == null || mParent.getChildVisibleRect(this, r, offset)); 3995 } 3996 3997 /** 3998 * {@inheritDoc} 3999 */ 4000 @Override 4001 public final void layout(int l, int t, int r, int b) { 4002 if (mTransition == null || !mTransition.isChangingLayout()) { 4003 super.layout(l, t, r, b); 4004 } else { 4005 // record the fact that we noop'd it; request layout when transition finishes 4006 mLayoutSuppressed = true; 4007 } 4008 } 4009 4010 /** 4011 * {@inheritDoc} 4012 */ 4013 @Override 4014 protected abstract void onLayout(boolean changed, 4015 int l, int t, int r, int b); 4016 4017 /** 4018 * Indicates whether the view group has the ability to animate its children 4019 * after the first layout. 4020 * 4021 * @return true if the children can be animated, false otherwise 4022 */ 4023 protected boolean canAnimate() { 4024 return mLayoutAnimationController != null; 4025 } 4026 4027 /** 4028 * Runs the layout animation. Calling this method triggers a relayout of 4029 * this view group. 4030 */ 4031 public void startLayoutAnimation() { 4032 if (mLayoutAnimationController != null) { 4033 mGroupFlags |= FLAG_RUN_ANIMATION; 4034 requestLayout(); 4035 } 4036 } 4037 4038 /** 4039 * Schedules the layout animation to be played after the next layout pass 4040 * of this view group. This can be used to restart the layout animation 4041 * when the content of the view group changes or when the activity is 4042 * paused and resumed. 4043 */ 4044 public void scheduleLayoutAnimation() { 4045 mGroupFlags |= FLAG_RUN_ANIMATION; 4046 } 4047 4048 /** 4049 * Sets the layout animation controller used to animate the group's 4050 * children after the first layout. 4051 * 4052 * @param controller the animation controller 4053 */ 4054 public void setLayoutAnimation(LayoutAnimationController controller) { 4055 mLayoutAnimationController = controller; 4056 if (mLayoutAnimationController != null) { 4057 mGroupFlags |= FLAG_RUN_ANIMATION; 4058 } 4059 } 4060 4061 /** 4062 * Returns the layout animation controller used to animate the group's 4063 * children. 4064 * 4065 * @return the current animation controller 4066 */ 4067 public LayoutAnimationController getLayoutAnimation() { 4068 return mLayoutAnimationController; 4069 } 4070 4071 /** 4072 * Indicates whether the children's drawing cache is used during a layout 4073 * animation. By default, the drawing cache is enabled but this will prevent 4074 * nested layout animations from working. To nest animations, you must disable 4075 * the cache. 4076 * 4077 * @return true if the animation cache is enabled, false otherwise 4078 * 4079 * @see #setAnimationCacheEnabled(boolean) 4080 * @see View#setDrawingCacheEnabled(boolean) 4081 */ 4082 @ViewDebug.ExportedProperty 4083 public boolean isAnimationCacheEnabled() { 4084 return (mGroupFlags & FLAG_ANIMATION_CACHE) == FLAG_ANIMATION_CACHE; 4085 } 4086 4087 /** 4088 * Enables or disables the children's drawing cache during a layout animation. 4089 * By default, the drawing cache is enabled but this will prevent nested 4090 * layout animations from working. To nest animations, you must disable the 4091 * cache. 4092 * 4093 * @param enabled true to enable the animation cache, false otherwise 4094 * 4095 * @see #isAnimationCacheEnabled() 4096 * @see View#setDrawingCacheEnabled(boolean) 4097 */ 4098 public void setAnimationCacheEnabled(boolean enabled) { 4099 setBooleanFlag(FLAG_ANIMATION_CACHE, enabled); 4100 } 4101 4102 /** 4103 * Indicates whether this ViewGroup will always try to draw its children using their 4104 * drawing cache. By default this property is enabled. 4105 * 4106 * @return true if the animation cache is enabled, false otherwise 4107 * 4108 * @see #setAlwaysDrawnWithCacheEnabled(boolean) 4109 * @see #setChildrenDrawnWithCacheEnabled(boolean) 4110 * @see View#setDrawingCacheEnabled(boolean) 4111 */ 4112 @ViewDebug.ExportedProperty(category = "drawing") 4113 public boolean isAlwaysDrawnWithCacheEnabled() { 4114 return (mGroupFlags & FLAG_ALWAYS_DRAWN_WITH_CACHE) == FLAG_ALWAYS_DRAWN_WITH_CACHE; 4115 } 4116 4117 /** 4118 * Indicates whether this ViewGroup will always try to draw its children using their 4119 * drawing cache. This property can be set to true when the cache rendering is 4120 * slightly different from the children's normal rendering. Renderings can be different, 4121 * for instance, when the cache's quality is set to low. 4122 * 4123 * When this property is disabled, the ViewGroup will use the drawing cache of its 4124 * children only when asked to. It's usually the task of subclasses to tell ViewGroup 4125 * when to start using the drawing cache and when to stop using it. 4126 * 4127 * @param always true to always draw with the drawing cache, false otherwise 4128 * 4129 * @see #isAlwaysDrawnWithCacheEnabled() 4130 * @see #setChildrenDrawnWithCacheEnabled(boolean) 4131 * @see View#setDrawingCacheEnabled(boolean) 4132 * @see View#setDrawingCacheQuality(int) 4133 */ 4134 public void setAlwaysDrawnWithCacheEnabled(boolean always) { 4135 setBooleanFlag(FLAG_ALWAYS_DRAWN_WITH_CACHE, always); 4136 } 4137 4138 /** 4139 * Indicates whether the ViewGroup is currently drawing its children using 4140 * their drawing cache. 4141 * 4142 * @return true if children should be drawn with their cache, false otherwise 4143 * 4144 * @see #setAlwaysDrawnWithCacheEnabled(boolean) 4145 * @see #setChildrenDrawnWithCacheEnabled(boolean) 4146 */ 4147 @ViewDebug.ExportedProperty(category = "drawing") 4148 protected boolean isChildrenDrawnWithCacheEnabled() { 4149 return (mGroupFlags & FLAG_CHILDREN_DRAWN_WITH_CACHE) == FLAG_CHILDREN_DRAWN_WITH_CACHE; 4150 } 4151 4152 /** 4153 * Tells the ViewGroup to draw its children using their drawing cache. This property 4154 * is ignored when {@link #isAlwaysDrawnWithCacheEnabled()} is true. A child's drawing cache 4155 * will be used only if it has been enabled. 4156 * 4157 * Subclasses should call this method to start and stop using the drawing cache when 4158 * they perform performance sensitive operations, like scrolling or animating. 4159 * 4160 * @param enabled true if children should be drawn with their cache, false otherwise 4161 * 4162 * @see #setAlwaysDrawnWithCacheEnabled(boolean) 4163 * @see #isChildrenDrawnWithCacheEnabled() 4164 */ 4165 protected void setChildrenDrawnWithCacheEnabled(boolean enabled) { 4166 setBooleanFlag(FLAG_CHILDREN_DRAWN_WITH_CACHE, enabled); 4167 } 4168 4169 /** 4170 * Indicates whether the ViewGroup is drawing its children in the order defined by 4171 * {@link #getChildDrawingOrder(int, int)}. 4172 * 4173 * @return true if children drawing order is defined by {@link #getChildDrawingOrder(int, int)}, 4174 * false otherwise 4175 * 4176 * @see #setChildrenDrawingOrderEnabled(boolean) 4177 * @see #getChildDrawingOrder(int, int) 4178 */ 4179 @ViewDebug.ExportedProperty(category = "drawing") 4180 protected boolean isChildrenDrawingOrderEnabled() { 4181 return (mGroupFlags & FLAG_USE_CHILD_DRAWING_ORDER) == FLAG_USE_CHILD_DRAWING_ORDER; 4182 } 4183 4184 /** 4185 * Tells the ViewGroup whether to draw its children in the order defined by the method 4186 * {@link #getChildDrawingOrder(int, int)}. 4187 * 4188 * @param enabled true if the order of the children when drawing is determined by 4189 * {@link #getChildDrawingOrder(int, int)}, false otherwise 4190 * 4191 * @see #isChildrenDrawingOrderEnabled() 4192 * @see #getChildDrawingOrder(int, int) 4193 */ 4194 protected void setChildrenDrawingOrderEnabled(boolean enabled) { 4195 setBooleanFlag(FLAG_USE_CHILD_DRAWING_ORDER, enabled); 4196 } 4197 4198 private void setBooleanFlag(int flag, boolean value) { 4199 if (value) { 4200 mGroupFlags |= flag; 4201 } else { 4202 mGroupFlags &= ~flag; 4203 } 4204 } 4205 4206 /** 4207 * Returns an integer indicating what types of drawing caches are kept in memory. 4208 * 4209 * @see #setPersistentDrawingCache(int) 4210 * @see #setAnimationCacheEnabled(boolean) 4211 * 4212 * @return one or a combination of {@link #PERSISTENT_NO_CACHE}, 4213 * {@link #PERSISTENT_ANIMATION_CACHE}, {@link #PERSISTENT_SCROLLING_CACHE} 4214 * and {@link #PERSISTENT_ALL_CACHES} 4215 */ 4216 @ViewDebug.ExportedProperty(category = "drawing", mapping = { 4217 @ViewDebug.IntToString(from = PERSISTENT_NO_CACHE, to = "NONE"), 4218 @ViewDebug.IntToString(from = PERSISTENT_ANIMATION_CACHE, to = "ANIMATION"), 4219 @ViewDebug.IntToString(from = PERSISTENT_SCROLLING_CACHE, to = "SCROLLING"), 4220 @ViewDebug.IntToString(from = PERSISTENT_ALL_CACHES, to = "ALL") 4221 }) 4222 public int getPersistentDrawingCache() { 4223 return mPersistentDrawingCache; 4224 } 4225 4226 /** 4227 * Indicates what types of drawing caches should be kept in memory after 4228 * they have been created. 4229 * 4230 * @see #getPersistentDrawingCache() 4231 * @see #setAnimationCacheEnabled(boolean) 4232 * 4233 * @param drawingCacheToKeep one or a combination of {@link #PERSISTENT_NO_CACHE}, 4234 * {@link #PERSISTENT_ANIMATION_CACHE}, {@link #PERSISTENT_SCROLLING_CACHE} 4235 * and {@link #PERSISTENT_ALL_CACHES} 4236 */ 4237 public void setPersistentDrawingCache(int drawingCacheToKeep) { 4238 mPersistentDrawingCache = drawingCacheToKeep & PERSISTENT_ALL_CACHES; 4239 } 4240 4241 /** 4242 * Returns a new set of layout parameters based on the supplied attributes set. 4243 * 4244 * @param attrs the attributes to build the layout parameters from 4245 * 4246 * @return an instance of {@link android.view.ViewGroup.LayoutParams} or one 4247 * of its descendants 4248 */ 4249 public LayoutParams generateLayoutParams(AttributeSet attrs) { 4250 return new LayoutParams(getContext(), attrs); 4251 } 4252 4253 /** 4254 * Returns a safe set of layout parameters based on the supplied layout params. 4255 * When a ViewGroup is passed a View whose layout params do not pass the test of 4256 * {@link #checkLayoutParams(android.view.ViewGroup.LayoutParams)}, this method 4257 * is invoked. This method should return a new set of layout params suitable for 4258 * this ViewGroup, possibly by copying the appropriate attributes from the 4259 * specified set of layout params. 4260 * 4261 * @param p The layout parameters to convert into a suitable set of layout parameters 4262 * for this ViewGroup. 4263 * 4264 * @return an instance of {@link android.view.ViewGroup.LayoutParams} or one 4265 * of its descendants 4266 */ 4267 protected LayoutParams generateLayoutParams(ViewGroup.LayoutParams p) { 4268 return p; 4269 } 4270 4271 /** 4272 * Returns a set of default layout parameters. These parameters are requested 4273 * when the View passed to {@link #addView(View)} has no layout parameters 4274 * already set. If null is returned, an exception is thrown from addView. 4275 * 4276 * @return a set of default layout parameters or null 4277 */ 4278 protected LayoutParams generateDefaultLayoutParams() { 4279 return new LayoutParams(LayoutParams.WRAP_CONTENT, LayoutParams.WRAP_CONTENT); 4280 } 4281 4282 /** 4283 * @hide 4284 */ 4285 @Override 4286 protected boolean dispatchConsistencyCheck(int consistency) { 4287 boolean result = super.dispatchConsistencyCheck(consistency); 4288 4289 final int count = mChildrenCount; 4290 final View[] children = mChildren; 4291 for (int i = 0; i < count; i++) { 4292 if (!children[i].dispatchConsistencyCheck(consistency)) result = false; 4293 } 4294 4295 return result; 4296 } 4297 4298 /** 4299 * @hide 4300 */ 4301 @Override 4302 protected boolean onConsistencyCheck(int consistency) { 4303 boolean result = super.onConsistencyCheck(consistency); 4304 4305 final boolean checkLayout = (consistency & ViewDebug.CONSISTENCY_LAYOUT) != 0; 4306 final boolean checkDrawing = (consistency & ViewDebug.CONSISTENCY_DRAWING) != 0; 4307 4308 if (checkLayout) { 4309 final int count = mChildrenCount; 4310 final View[] children = mChildren; 4311 for (int i = 0; i < count; i++) { 4312 if (children[i].getParent() != this) { 4313 result = false; 4314 android.util.Log.d(ViewDebug.CONSISTENCY_LOG_TAG, 4315 "View " + children[i] + " has no parent/a parent that is not " + this); 4316 } 4317 } 4318 } 4319 4320 if (checkDrawing) { 4321 // If this group is dirty, check that the parent is dirty as well 4322 if ((mPrivateFlags & DIRTY_MASK) != 0) { 4323 final ViewParent parent = getParent(); 4324 if (parent != null && !(parent instanceof ViewRoot)) { 4325 if ((((View) parent).mPrivateFlags & DIRTY_MASK) == 0) { 4326 result = false; 4327 android.util.Log.d(ViewDebug.CONSISTENCY_LOG_TAG, 4328 "ViewGroup " + this + " is dirty but its parent is not: " + this); 4329 } 4330 } 4331 } 4332 } 4333 4334 return result; 4335 } 4336 4337 /** 4338 * {@inheritDoc} 4339 */ 4340 @Override 4341 protected void debug(int depth) { 4342 super.debug(depth); 4343 String output; 4344 4345 if (mFocused != null) { 4346 output = debugIndent(depth); 4347 output += "mFocused"; 4348 Log.d(VIEW_LOG_TAG, output); 4349 } 4350 if (mChildrenCount != 0) { 4351 output = debugIndent(depth); 4352 output += "{"; 4353 Log.d(VIEW_LOG_TAG, output); 4354 } 4355 int count = mChildrenCount; 4356 for (int i = 0; i < count; i++) { 4357 View child = mChildren[i]; 4358 child.debug(depth + 1); 4359 } 4360 4361 if (mChildrenCount != 0) { 4362 output = debugIndent(depth); 4363 output += "}"; 4364 Log.d(VIEW_LOG_TAG, output); 4365 } 4366 } 4367 4368 /** 4369 * Returns the position in the group of the specified child view. 4370 * 4371 * @param child the view for which to get the position 4372 * @return a positive integer representing the position of the view in the 4373 * group, or -1 if the view does not exist in the group 4374 */ 4375 public int indexOfChild(View child) { 4376 final int count = mChildrenCount; 4377 final View[] children = mChildren; 4378 for (int i = 0; i < count; i++) { 4379 if (children[i] == child) { 4380 return i; 4381 } 4382 } 4383 return -1; 4384 } 4385 4386 /** 4387 * Returns the number of children in the group. 4388 * 4389 * @return a positive integer representing the number of children in 4390 * the group 4391 */ 4392 public int getChildCount() { 4393 return mChildrenCount; 4394 } 4395 4396 /** 4397 * Returns the view at the specified position in the group. 4398 * 4399 * @param index the position at which to get the view from 4400 * @return the view at the specified position or null if the position 4401 * does not exist within the group 4402 */ 4403 public View getChildAt(int index) { 4404 if (index < 0 || index >= mChildrenCount) { 4405 return null; 4406 } 4407 return mChildren[index]; 4408 } 4409 4410 /** 4411 * Ask all of the children of this view to measure themselves, taking into 4412 * account both the MeasureSpec requirements for this view and its padding. 4413 * We skip children that are in the GONE state The heavy lifting is done in 4414 * getChildMeasureSpec. 4415 * 4416 * @param widthMeasureSpec The width requirements for this view 4417 * @param heightMeasureSpec The height requirements for this view 4418 */ 4419 protected void measureChildren(int widthMeasureSpec, int heightMeasureSpec) { 4420 final int size = mChildrenCount; 4421 final View[] children = mChildren; 4422 for (int i = 0; i < size; ++i) { 4423 final View child = children[i]; 4424 if ((child.mViewFlags & VISIBILITY_MASK) != GONE) { 4425 measureChild(child, widthMeasureSpec, heightMeasureSpec); 4426 } 4427 } 4428 } 4429 4430 /** 4431 * Ask one of the children of this view to measure itself, taking into 4432 * account both the MeasureSpec requirements for this view and its padding. 4433 * The heavy lifting is done in getChildMeasureSpec. 4434 * 4435 * @param child The child to measure 4436 * @param parentWidthMeasureSpec The width requirements for this view 4437 * @param parentHeightMeasureSpec The height requirements for this view 4438 */ 4439 protected void measureChild(View child, int parentWidthMeasureSpec, 4440 int parentHeightMeasureSpec) { 4441 final LayoutParams lp = child.getLayoutParams(); 4442 4443 final int childWidthMeasureSpec = getChildMeasureSpec(parentWidthMeasureSpec, 4444 mPaddingLeft + mPaddingRight, lp.width); 4445 final int childHeightMeasureSpec = getChildMeasureSpec(parentHeightMeasureSpec, 4446 mPaddingTop + mPaddingBottom, lp.height); 4447 4448 child.measure(childWidthMeasureSpec, childHeightMeasureSpec); 4449 } 4450 4451 /** 4452 * Ask one of the children of this view to measure itself, taking into 4453 * account both the MeasureSpec requirements for this view and its padding 4454 * and margins. The child must have MarginLayoutParams The heavy lifting is 4455 * done in getChildMeasureSpec. 4456 * 4457 * @param child The child to measure 4458 * @param parentWidthMeasureSpec The width requirements for this view 4459 * @param widthUsed Extra space that has been used up by the parent 4460 * horizontally (possibly by other children of the parent) 4461 * @param parentHeightMeasureSpec The height requirements for this view 4462 * @param heightUsed Extra space that has been used up by the parent 4463 * vertically (possibly by other children of the parent) 4464 */ 4465 protected void measureChildWithMargins(View child, 4466 int parentWidthMeasureSpec, int widthUsed, 4467 int parentHeightMeasureSpec, int heightUsed) { 4468 final MarginLayoutParams lp = (MarginLayoutParams) child.getLayoutParams(); 4469 4470 final int childWidthMeasureSpec = getChildMeasureSpec(parentWidthMeasureSpec, 4471 mPaddingLeft + mPaddingRight + lp.leftMargin + lp.rightMargin 4472 + widthUsed, lp.width); 4473 final int childHeightMeasureSpec = getChildMeasureSpec(parentHeightMeasureSpec, 4474 mPaddingTop + mPaddingBottom + lp.topMargin + lp.bottomMargin 4475 + heightUsed, lp.height); 4476 4477 child.measure(childWidthMeasureSpec, childHeightMeasureSpec); 4478 } 4479 4480 /** 4481 * Does the hard part of measureChildren: figuring out the MeasureSpec to 4482 * pass to a particular child. This method figures out the right MeasureSpec 4483 * for one dimension (height or width) of one child view. 4484 * 4485 * The goal is to combine information from our MeasureSpec with the 4486 * LayoutParams of the child to get the best possible results. For example, 4487 * if the this view knows its size (because its MeasureSpec has a mode of 4488 * EXACTLY), and the child has indicated in its LayoutParams that it wants 4489 * to be the same size as the parent, the parent should ask the child to 4490 * layout given an exact size. 4491 * 4492 * @param spec The requirements for this view 4493 * @param padding The padding of this view for the current dimension and 4494 * margins, if applicable 4495 * @param childDimension How big the child wants to be in the current 4496 * dimension 4497 * @return a MeasureSpec integer for the child 4498 */ 4499 public static int getChildMeasureSpec(int spec, int padding, int childDimension) { 4500 int specMode = MeasureSpec.getMode(spec); 4501 int specSize = MeasureSpec.getSize(spec); 4502 4503 int size = Math.max(0, specSize - padding); 4504 4505 int resultSize = 0; 4506 int resultMode = 0; 4507 4508 switch (specMode) { 4509 // Parent has imposed an exact size on us 4510 case MeasureSpec.EXACTLY: 4511 if (childDimension >= 0) { 4512 resultSize = childDimension; 4513 resultMode = MeasureSpec.EXACTLY; 4514 } else if (childDimension == LayoutParams.MATCH_PARENT) { 4515 // Child wants to be our size. So be it. 4516 resultSize = size; 4517 resultMode = MeasureSpec.EXACTLY; 4518 } else if (childDimension == LayoutParams.WRAP_CONTENT) { 4519 // Child wants to determine its own size. It can't be 4520 // bigger than us. 4521 resultSize = size; 4522 resultMode = MeasureSpec.AT_MOST; 4523 } 4524 break; 4525 4526 // Parent has imposed a maximum size on us 4527 case MeasureSpec.AT_MOST: 4528 if (childDimension >= 0) { 4529 // Child wants a specific size... so be it 4530 resultSize = childDimension; 4531 resultMode = MeasureSpec.EXACTLY; 4532 } else if (childDimension == LayoutParams.MATCH_PARENT) { 4533 // Child wants to be our size, but our size is not fixed. 4534 // Constrain child to not be bigger than us. 4535 resultSize = size; 4536 resultMode = MeasureSpec.AT_MOST; 4537 } else if (childDimension == LayoutParams.WRAP_CONTENT) { 4538 // Child wants to determine its own size. It can't be 4539 // bigger than us. 4540 resultSize = size; 4541 resultMode = MeasureSpec.AT_MOST; 4542 } 4543 break; 4544 4545 // Parent asked to see how big we want to be 4546 case MeasureSpec.UNSPECIFIED: 4547 if (childDimension >= 0) { 4548 // Child wants a specific size... let him have it 4549 resultSize = childDimension; 4550 resultMode = MeasureSpec.EXACTLY; 4551 } else if (childDimension == LayoutParams.MATCH_PARENT) { 4552 // Child wants to be our size... find out how big it should 4553 // be 4554 resultSize = 0; 4555 resultMode = MeasureSpec.UNSPECIFIED; 4556 } else if (childDimension == LayoutParams.WRAP_CONTENT) { 4557 // Child wants to determine its own size.... find out how 4558 // big it should be 4559 resultSize = 0; 4560 resultMode = MeasureSpec.UNSPECIFIED; 4561 } 4562 break; 4563 } 4564 return MeasureSpec.makeMeasureSpec(resultSize, resultMode); 4565 } 4566 4567 4568 /** 4569 * Removes any pending animations for views that have been removed. Call 4570 * this if you don't want animations for exiting views to stack up. 4571 */ 4572 public void clearDisappearingChildren() { 4573 if (mDisappearingChildren != null) { 4574 mDisappearingChildren.clear(); 4575 } 4576 } 4577 4578 /** 4579 * Add a view which is removed from mChildren but still needs animation 4580 * 4581 * @param v View to add 4582 */ 4583 private void addDisappearingView(View v) { 4584 ArrayList<View> disappearingChildren = mDisappearingChildren; 4585 4586 if (disappearingChildren == null) { 4587 disappearingChildren = mDisappearingChildren = new ArrayList<View>(); 4588 } 4589 4590 disappearingChildren.add(v); 4591 } 4592 4593 /** 4594 * Cleanup a view when its animation is done. This may mean removing it from 4595 * the list of disappearing views. 4596 * 4597 * @param view The view whose animation has finished 4598 * @param animation The animation, cannot be null 4599 */ 4600 private void finishAnimatingView(final View view, Animation animation) { 4601 final ArrayList<View> disappearingChildren = mDisappearingChildren; 4602 if (disappearingChildren != null) { 4603 if (disappearingChildren.contains(view)) { 4604 disappearingChildren.remove(view); 4605 4606 if (view.mAttachInfo != null) { 4607 view.dispatchDetachedFromWindow(); 4608 } 4609 4610 view.clearAnimation(); 4611 mGroupFlags |= FLAG_INVALIDATE_REQUIRED; 4612 } 4613 } 4614 4615 if (animation != null && !animation.getFillAfter()) { 4616 view.clearAnimation(); 4617 } 4618 4619 if ((view.mPrivateFlags & ANIMATION_STARTED) == ANIMATION_STARTED) { 4620 view.onAnimationEnd(); 4621 // Should be performed by onAnimationEnd() but this avoid an infinite loop, 4622 // so we'd rather be safe than sorry 4623 view.mPrivateFlags &= ~ANIMATION_STARTED; 4624 // Draw one more frame after the animation is done 4625 mGroupFlags |= FLAG_INVALIDATE_REQUIRED; 4626 } 4627 } 4628 4629 /** 4630 * This method tells the ViewGroup that the given View object, which should have this 4631 * ViewGroup as its parent, 4632 * should be kept around (re-displayed when the ViewGroup draws its children) even if it 4633 * is removed from its parent. This allows animations, such as those used by 4634 * {@link android.app.Fragment} and {@link android.animation.LayoutTransition} to animate 4635 * the removal of views. A call to this method should always be accompanied by a later call 4636 * to {@link #endViewTransition(View)}, such as after an animation on the View has finished, 4637 * so that the View finally gets removed. 4638 * 4639 * @param view The View object to be kept visible even if it gets removed from its parent. 4640 */ 4641 public void startViewTransition(View view) { 4642 if (view.mParent == this) { 4643 if (mTransitioningViews == null) { 4644 mTransitioningViews = new ArrayList<View>(); 4645 } 4646 mTransitioningViews.add(view); 4647 } 4648 } 4649 4650 /** 4651 * This method should always be called following an earlier call to 4652 * {@link #startViewTransition(View)}. The given View is finally removed from its parent 4653 * and will no longer be displayed. Note that this method does not perform the functionality 4654 * of removing a view from its parent; it just discontinues the display of a View that 4655 * has previously been removed. 4656 * 4657 * @return view The View object that has been removed but is being kept around in the visible 4658 * hierarchy by an earlier call to {@link #startViewTransition(View)}. 4659 */ 4660 public void endViewTransition(View view) { 4661 if (mTransitioningViews != null) { 4662 mTransitioningViews.remove(view); 4663 final ArrayList<View> disappearingChildren = mDisappearingChildren; 4664 if (disappearingChildren != null && disappearingChildren.contains(view)) { 4665 disappearingChildren.remove(view); 4666 if (mVisibilityChangingChildren != null && 4667 mVisibilityChangingChildren.contains(view)) { 4668 mVisibilityChangingChildren.remove(view); 4669 } else { 4670 if (view.mAttachInfo != null) { 4671 view.dispatchDetachedFromWindow(); 4672 } 4673 if (view.mParent != null) { 4674 view.mParent = null; 4675 } 4676 } 4677 mGroupFlags |= FLAG_INVALIDATE_REQUIRED; 4678 } 4679 } 4680 } 4681 4682 private LayoutTransition.TransitionListener mLayoutTransitionListener = 4683 new LayoutTransition.TransitionListener() { 4684 @Override 4685 public void startTransition(LayoutTransition transition, ViewGroup container, 4686 View view, int transitionType) { 4687 // We only care about disappearing items, since we need special logic to keep 4688 // those items visible after they've been 'removed' 4689 if (transitionType == LayoutTransition.DISAPPEARING) { 4690 startViewTransition(view); 4691 } 4692 } 4693 4694 @Override 4695 public void endTransition(LayoutTransition transition, ViewGroup container, 4696 View view, int transitionType) { 4697 if (mLayoutSuppressed && !transition.isChangingLayout()) { 4698 requestLayout(); 4699 mLayoutSuppressed = false; 4700 } 4701 if (transitionType == LayoutTransition.DISAPPEARING && mTransitioningViews != null) { 4702 endViewTransition(view); 4703 } 4704 } 4705 }; 4706 4707 /** 4708 * {@inheritDoc} 4709 */ 4710 @Override 4711 public boolean gatherTransparentRegion(Region region) { 4712 // If no transparent regions requested, we are always opaque. 4713 final boolean meOpaque = (mPrivateFlags & View.REQUEST_TRANSPARENT_REGIONS) == 0; 4714 if (meOpaque && region == null) { 4715 // The caller doesn't care about the region, so stop now. 4716 return true; 4717 } 4718 super.gatherTransparentRegion(region); 4719 final View[] children = mChildren; 4720 final int count = mChildrenCount; 4721 boolean noneOfTheChildrenAreTransparent = true; 4722 for (int i = 0; i < count; i++) { 4723 final View child = children[i]; 4724 if ((child.mViewFlags & VISIBILITY_MASK) == VISIBLE || child.getAnimation() != null) { 4725 if (!child.gatherTransparentRegion(region)) { 4726 noneOfTheChildrenAreTransparent = false; 4727 } 4728 } 4729 } 4730 return meOpaque || noneOfTheChildrenAreTransparent; 4731 } 4732 4733 /** 4734 * {@inheritDoc} 4735 */ 4736 public void requestTransparentRegion(View child) { 4737 if (child != null) { 4738 child.mPrivateFlags |= View.REQUEST_TRANSPARENT_REGIONS; 4739 if (mParent != null) { 4740 mParent.requestTransparentRegion(this); 4741 } 4742 } 4743 } 4744 4745 4746 @Override 4747 protected boolean fitSystemWindows(Rect insets) { 4748 boolean done = super.fitSystemWindows(insets); 4749 if (!done) { 4750 final int count = mChildrenCount; 4751 final View[] children = mChildren; 4752 for (int i = 0; i < count; i++) { 4753 done = children[i].fitSystemWindows(insets); 4754 if (done) { 4755 break; 4756 } 4757 } 4758 } 4759 return done; 4760 } 4761 4762 /** 4763 * Returns the animation listener to which layout animation events are 4764 * sent. 4765 * 4766 * @return an {@link android.view.animation.Animation.AnimationListener} 4767 */ 4768 public Animation.AnimationListener getLayoutAnimationListener() { 4769 return mAnimationListener; 4770 } 4771 4772 @Override 4773 protected void drawableStateChanged() { 4774 super.drawableStateChanged(); 4775 4776 if ((mGroupFlags & FLAG_NOTIFY_CHILDREN_ON_DRAWABLE_STATE_CHANGE) != 0) { 4777 if ((mGroupFlags & FLAG_ADD_STATES_FROM_CHILDREN) != 0) { 4778 throw new IllegalStateException("addStateFromChildren cannot be enabled if a" 4779 + " child has duplicateParentState set to true"); 4780 } 4781 4782 final View[] children = mChildren; 4783 final int count = mChildrenCount; 4784 4785 for (int i = 0; i < count; i++) { 4786 final View child = children[i]; 4787 if ((child.mViewFlags & DUPLICATE_PARENT_STATE) != 0) { 4788 child.refreshDrawableState(); 4789 } 4790 } 4791 } 4792 } 4793 4794 @Override 4795 public void jumpDrawablesToCurrentState() { 4796 super.jumpDrawablesToCurrentState(); 4797 final View[] children = mChildren; 4798 final int count = mChildrenCount; 4799 for (int i = 0; i < count; i++) { 4800 children[i].jumpDrawablesToCurrentState(); 4801 } 4802 } 4803 4804 @Override 4805 protected int[] onCreateDrawableState(int extraSpace) { 4806 if ((mGroupFlags & FLAG_ADD_STATES_FROM_CHILDREN) == 0) { 4807 return super.onCreateDrawableState(extraSpace); 4808 } 4809 4810 int need = 0; 4811 int n = getChildCount(); 4812 for (int i = 0; i < n; i++) { 4813 int[] childState = getChildAt(i).getDrawableState(); 4814 4815 if (childState != null) { 4816 need += childState.length; 4817 } 4818 } 4819 4820 int[] state = super.onCreateDrawableState(extraSpace + need); 4821 4822 for (int i = 0; i < n; i++) { 4823 int[] childState = getChildAt(i).getDrawableState(); 4824 4825 if (childState != null) { 4826 state = mergeDrawableStates(state, childState); 4827 } 4828 } 4829 4830 return state; 4831 } 4832 4833 /** 4834 * Sets whether this ViewGroup's drawable states also include 4835 * its children's drawable states. This is used, for example, to 4836 * make a group appear to be focused when its child EditText or button 4837 * is focused. 4838 */ 4839 public void setAddStatesFromChildren(boolean addsStates) { 4840 if (addsStates) { 4841 mGroupFlags |= FLAG_ADD_STATES_FROM_CHILDREN; 4842 } else { 4843 mGroupFlags &= ~FLAG_ADD_STATES_FROM_CHILDREN; 4844 } 4845 4846 refreshDrawableState(); 4847 } 4848 4849 /** 4850 * Returns whether this ViewGroup's drawable states also include 4851 * its children's drawable states. This is used, for example, to 4852 * make a group appear to be focused when its child EditText or button 4853 * is focused. 4854 */ 4855 public boolean addStatesFromChildren() { 4856 return (mGroupFlags & FLAG_ADD_STATES_FROM_CHILDREN) != 0; 4857 } 4858 4859 /** 4860 * If {link #addStatesFromChildren} is true, refreshes this group's 4861 * drawable state (to include the states from its children). 4862 */ 4863 public void childDrawableStateChanged(View child) { 4864 if ((mGroupFlags & FLAG_ADD_STATES_FROM_CHILDREN) != 0) { 4865 refreshDrawableState(); 4866 } 4867 } 4868 4869 /** 4870 * Specifies the animation listener to which layout animation events must 4871 * be sent. Only 4872 * {@link android.view.animation.Animation.AnimationListener#onAnimationStart(Animation)} 4873 * and 4874 * {@link android.view.animation.Animation.AnimationListener#onAnimationEnd(Animation)} 4875 * are invoked. 4876 * 4877 * @param animationListener the layout animation listener 4878 */ 4879 public void setLayoutAnimationListener(Animation.AnimationListener animationListener) { 4880 mAnimationListener = animationListener; 4881 } 4882 4883 /** 4884 * LayoutParams are used by views to tell their parents how they want to be 4885 * laid out. See 4886 * {@link android.R.styleable#ViewGroup_Layout ViewGroup Layout Attributes} 4887 * for a list of all child view attributes that this class supports. 4888 * 4889 * <p> 4890 * The base LayoutParams class just describes how big the view wants to be 4891 * for both width and height. For each dimension, it can specify one of: 4892 * <ul> 4893 * <li>FILL_PARENT (renamed MATCH_PARENT in API Level 8 and higher), which 4894 * means that the view wants to be as big as its parent (minus padding) 4895 * <li> WRAP_CONTENT, which means that the view wants to be just big enough 4896 * to enclose its content (plus padding) 4897 * <li> an exact number 4898 * </ul> 4899 * There are subclasses of LayoutParams for different subclasses of 4900 * ViewGroup. For example, AbsoluteLayout has its own subclass of 4901 * LayoutParams which adds an X and Y value. 4902 * 4903 * @attr ref android.R.styleable#ViewGroup_Layout_layout_height 4904 * @attr ref android.R.styleable#ViewGroup_Layout_layout_width 4905 */ 4906 public static class LayoutParams { 4907 /** 4908 * Special value for the height or width requested by a View. 4909 * FILL_PARENT means that the view wants to be as big as its parent, 4910 * minus the parent's padding, if any. This value is deprecated 4911 * starting in API Level 8 and replaced by {@link #MATCH_PARENT}. 4912 */ 4913 @SuppressWarnings({"UnusedDeclaration"}) 4914 @Deprecated 4915 public static final int FILL_PARENT = -1; 4916 4917 /** 4918 * Special value for the height or width requested by a View. 4919 * MATCH_PARENT means that the view wants to be as big as its parent, 4920 * minus the parent's padding, if any. Introduced in API Level 8. 4921 */ 4922 public static final int MATCH_PARENT = -1; 4923 4924 /** 4925 * Special value for the height or width requested by a View. 4926 * WRAP_CONTENT means that the view wants to be just large enough to fit 4927 * its own internal content, taking its own padding into account. 4928 */ 4929 public static final int WRAP_CONTENT = -2; 4930 4931 /** 4932 * Information about how wide the view wants to be. Can be one of the 4933 * constants FILL_PARENT (replaced by MATCH_PARENT , 4934 * in API Level 8) or WRAP_CONTENT. or an exact size. 4935 */ 4936 @ViewDebug.ExportedProperty(category = "layout", mapping = { 4937 @ViewDebug.IntToString(from = MATCH_PARENT, to = "MATCH_PARENT"), 4938 @ViewDebug.IntToString(from = WRAP_CONTENT, to = "WRAP_CONTENT") 4939 }) 4940 public int width; 4941 4942 /** 4943 * Information about how tall the view wants to be. Can be one of the 4944 * constants FILL_PARENT (replaced by MATCH_PARENT , 4945 * in API Level 8) or WRAP_CONTENT. or an exact size. 4946 */ 4947 @ViewDebug.ExportedProperty(category = "layout", mapping = { 4948 @ViewDebug.IntToString(from = MATCH_PARENT, to = "MATCH_PARENT"), 4949 @ViewDebug.IntToString(from = WRAP_CONTENT, to = "WRAP_CONTENT") 4950 }) 4951 public int height; 4952 4953 /** 4954 * Used to animate layouts. 4955 */ 4956 public LayoutAnimationController.AnimationParameters layoutAnimationParameters; 4957 4958 /** 4959 * Creates a new set of layout parameters. The values are extracted from 4960 * the supplied attributes set and context. The XML attributes mapped 4961 * to this set of layout parameters are: 4962 * 4963 * <ul> 4964 * <li><code>layout_width</code>: the width, either an exact value, 4965 * {@link #WRAP_CONTENT}, or {@link #FILL_PARENT} (replaced by 4966 * {@link #MATCH_PARENT} in API Level 8)</li> 4967 * <li><code>layout_height</code>: the height, either an exact value, 4968 * {@link #WRAP_CONTENT}, or {@link #FILL_PARENT} (replaced by 4969 * {@link #MATCH_PARENT} in API Level 8)</li> 4970 * </ul> 4971 * 4972 * @param c the application environment 4973 * @param attrs the set of attributes from which to extract the layout 4974 * parameters' values 4975 */ 4976 public LayoutParams(Context c, AttributeSet attrs) { 4977 TypedArray a = c.obtainStyledAttributes(attrs, R.styleable.ViewGroup_Layout); 4978 setBaseAttributes(a, 4979 R.styleable.ViewGroup_Layout_layout_width, 4980 R.styleable.ViewGroup_Layout_layout_height); 4981 a.recycle(); 4982 } 4983 4984 /** 4985 * Creates a new set of layout parameters with the specified width 4986 * and height. 4987 * 4988 * @param width the width, either {@link #WRAP_CONTENT}, 4989 * {@link #FILL_PARENT} (replaced by {@link #MATCH_PARENT} in 4990 * API Level 8), or a fixed size in pixels 4991 * @param height the height, either {@link #WRAP_CONTENT}, 4992 * {@link #FILL_PARENT} (replaced by {@link #MATCH_PARENT} in 4993 * API Level 8), or a fixed size in pixels 4994 */ 4995 public LayoutParams(int width, int height) { 4996 this.width = width; 4997 this.height = height; 4998 } 4999 5000 /** 5001 * Copy constructor. Clones the width and height values of the source. 5002 * 5003 * @param source The layout params to copy from. 5004 */ 5005 public LayoutParams(LayoutParams source) { 5006 this.width = source.width; 5007 this.height = source.height; 5008 } 5009 5010 /** 5011 * Used internally by MarginLayoutParams. 5012 * @hide 5013 */ 5014 LayoutParams() { 5015 } 5016 5017 /** 5018 * Extracts the layout parameters from the supplied attributes. 5019 * 5020 * @param a the style attributes to extract the parameters from 5021 * @param widthAttr the identifier of the width attribute 5022 * @param heightAttr the identifier of the height attribute 5023 */ 5024 protected void setBaseAttributes(TypedArray a, int widthAttr, int heightAttr) { 5025 width = a.getLayoutDimension(widthAttr, "layout_width"); 5026 height = a.getLayoutDimension(heightAttr, "layout_height"); 5027 } 5028 5029 /** 5030 * Returns a String representation of this set of layout parameters. 5031 * 5032 * @param output the String to prepend to the internal representation 5033 * @return a String with the following format: output + 5034 * "ViewGroup.LayoutParams={ width=WIDTH, height=HEIGHT }" 5035 * 5036 * @hide 5037 */ 5038 public String debug(String output) { 5039 return output + "ViewGroup.LayoutParams={ width=" 5040 + sizeToString(width) + ", height=" + sizeToString(height) + " }"; 5041 } 5042 5043 /** 5044 * Converts the specified size to a readable String. 5045 * 5046 * @param size the size to convert 5047 * @return a String instance representing the supplied size 5048 * 5049 * @hide 5050 */ 5051 protected static String sizeToString(int size) { 5052 if (size == WRAP_CONTENT) { 5053 return "wrap-content"; 5054 } 5055 if (size == MATCH_PARENT) { 5056 return "match-parent"; 5057 } 5058 return String.valueOf(size); 5059 } 5060 } 5061 5062 /** 5063 * Per-child layout information for layouts that support margins. 5064 * See 5065 * {@link android.R.styleable#ViewGroup_MarginLayout ViewGroup Margin Layout Attributes} 5066 * for a list of all child view attributes that this class supports. 5067 */ 5068 public static class MarginLayoutParams extends ViewGroup.LayoutParams { 5069 /** 5070 * The left margin in pixels of the child. 5071 */ 5072 @ViewDebug.ExportedProperty(category = "layout") 5073 public int leftMargin; 5074 5075 /** 5076 * The top margin in pixels of the child. 5077 */ 5078 @ViewDebug.ExportedProperty(category = "layout") 5079 public int topMargin; 5080 5081 /** 5082 * The right margin in pixels of the child. 5083 */ 5084 @ViewDebug.ExportedProperty(category = "layout") 5085 public int rightMargin; 5086 5087 /** 5088 * The bottom margin in pixels of the child. 5089 */ 5090 @ViewDebug.ExportedProperty(category = "layout") 5091 public int bottomMargin; 5092 5093 /** 5094 * Creates a new set of layout parameters. The values are extracted from 5095 * the supplied attributes set and context. 5096 * 5097 * @param c the application environment 5098 * @param attrs the set of attributes from which to extract the layout 5099 * parameters' values 5100 */ 5101 public MarginLayoutParams(Context c, AttributeSet attrs) { 5102 super(); 5103 5104 TypedArray a = c.obtainStyledAttributes(attrs, R.styleable.ViewGroup_MarginLayout); 5105 setBaseAttributes(a, 5106 R.styleable.ViewGroup_MarginLayout_layout_width, 5107 R.styleable.ViewGroup_MarginLayout_layout_height); 5108 5109 int margin = a.getDimensionPixelSize( 5110 com.android.internal.R.styleable.ViewGroup_MarginLayout_layout_margin, -1); 5111 if (margin >= 0) { 5112 leftMargin = margin; 5113 topMargin = margin; 5114 rightMargin= margin; 5115 bottomMargin = margin; 5116 } else { 5117 leftMargin = a.getDimensionPixelSize( 5118 R.styleable.ViewGroup_MarginLayout_layout_marginLeft, 0); 5119 topMargin = a.getDimensionPixelSize( 5120 R.styleable.ViewGroup_MarginLayout_layout_marginTop, 0); 5121 rightMargin = a.getDimensionPixelSize( 5122 R.styleable.ViewGroup_MarginLayout_layout_marginRight, 0); 5123 bottomMargin = a.getDimensionPixelSize( 5124 R.styleable.ViewGroup_MarginLayout_layout_marginBottom, 0); 5125 } 5126 5127 a.recycle(); 5128 } 5129 5130 /** 5131 * {@inheritDoc} 5132 */ 5133 public MarginLayoutParams(int width, int height) { 5134 super(width, height); 5135 } 5136 5137 /** 5138 * Copy constructor. Clones the width, height and margin values of the source. 5139 * 5140 * @param source The layout params to copy from. 5141 */ 5142 public MarginLayoutParams(MarginLayoutParams source) { 5143 this.width = source.width; 5144 this.height = source.height; 5145 5146 this.leftMargin = source.leftMargin; 5147 this.topMargin = source.topMargin; 5148 this.rightMargin = source.rightMargin; 5149 this.bottomMargin = source.bottomMargin; 5150 } 5151 5152 /** 5153 * {@inheritDoc} 5154 */ 5155 public MarginLayoutParams(LayoutParams source) { 5156 super(source); 5157 } 5158 5159 /** 5160 * Sets the margins, in pixels. 5161 * 5162 * @param left the left margin size 5163 * @param top the top margin size 5164 * @param right the right margin size 5165 * @param bottom the bottom margin size 5166 * 5167 * @attr ref android.R.styleable#ViewGroup_MarginLayout_layout_marginLeft 5168 * @attr ref android.R.styleable#ViewGroup_MarginLayout_layout_marginTop 5169 * @attr ref android.R.styleable#ViewGroup_MarginLayout_layout_marginRight 5170 * @attr ref android.R.styleable#ViewGroup_MarginLayout_layout_marginBottom 5171 */ 5172 public void setMargins(int left, int top, int right, int bottom) { 5173 leftMargin = left; 5174 topMargin = top; 5175 rightMargin = right; 5176 bottomMargin = bottom; 5177 } 5178 } 5179 5180 /* Describes a touched view and the ids of the pointers that it has captured. 5181 * 5182 * This code assumes that pointer ids are always in the range 0..31 such that 5183 * it can use a bitfield to track which pointer ids are present. 5184 * As it happens, the lower layers of the input dispatch pipeline also use the 5185 * same trick so the assumption should be safe here... 5186 */ 5187 private static final class TouchTarget { 5188 private static final int MAX_RECYCLED = 32; 5189 private static final Object sRecycleLock = new Object(); 5190 private static TouchTarget sRecycleBin; 5191 private static int sRecycledCount; 5192 5193 public static final int ALL_POINTER_IDS = -1; // all ones 5194 5195 // The touched child view. 5196 public View child; 5197 5198 // The combined bit mask of pointer ids for all pointers captured by the target. 5199 public int pointerIdBits; 5200 5201 // The next target in the target list. 5202 public TouchTarget next; 5203 5204 private TouchTarget() { 5205 } 5206 5207 public static TouchTarget obtain(View child, int pointerIdBits) { 5208 final TouchTarget target; 5209 synchronized (sRecycleLock) { 5210 if (sRecycleBin == null) { 5211 target = new TouchTarget(); 5212 } else { 5213 target = sRecycleBin; 5214 sRecycleBin = target.next; 5215 sRecycledCount--; 5216 target.next = null; 5217 } 5218 } 5219 target.child = child; 5220 target.pointerIdBits = pointerIdBits; 5221 return target; 5222 } 5223 5224 public void recycle() { 5225 synchronized (sRecycleLock) { 5226 if (sRecycledCount < MAX_RECYCLED) { 5227 next = sRecycleBin; 5228 sRecycleBin = this; 5229 sRecycledCount += 1; 5230 } else { 5231 next = null; 5232 } 5233 child = null; 5234 } 5235 } 5236 } 5237} 5238