ViewGroup.java revision a54a600bc41c8ac760f85333b0c562cdc6770531
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.accessibility.AccessibilityNodeInfo; 39import android.view.animation.AlphaAnimation; 40import android.view.animation.Animation; 41import android.view.animation.AnimationUtils; 42import android.view.animation.LayoutAnimationController; 43import android.view.animation.Transformation; 44import com.android.internal.R; 45import com.android.internal.util.Predicate; 46 47import java.util.ArrayList; 48import java.util.HashSet; 49 50/** 51 * <p> 52 * A <code>ViewGroup</code> is a special view that can contain other views 53 * (called children.) The view group is the base class for layouts and views 54 * containers. This class also defines the 55 * {@link android.view.ViewGroup.LayoutParams} class which serves as the base 56 * class for layouts parameters. 57 * </p> 58 * 59 * <p> 60 * Also see {@link LayoutParams} for layout attributes. 61 * </p> 62 * 63 * @attr ref android.R.styleable#ViewGroup_clipChildren 64 * @attr ref android.R.styleable#ViewGroup_clipToPadding 65 * @attr ref android.R.styleable#ViewGroup_layoutAnimation 66 * @attr ref android.R.styleable#ViewGroup_animationCache 67 * @attr ref android.R.styleable#ViewGroup_persistentDrawingCache 68 * @attr ref android.R.styleable#ViewGroup_alwaysDrawnWithCache 69 * @attr ref android.R.styleable#ViewGroup_addStatesFromChildren 70 * @attr ref android.R.styleable#ViewGroup_descendantFocusability 71 * @attr ref android.R.styleable#ViewGroup_animateLayoutChanges 72 */ 73public abstract class ViewGroup extends View implements ViewParent, ViewManager { 74 75 private static final boolean DBG = false; 76 77 /** 78 * Views which have been hidden or removed which need to be animated on 79 * their way out. 80 * This field should be made private, so it is hidden from the SDK. 81 * {@hide} 82 */ 83 protected ArrayList<View> mDisappearingChildren; 84 85 /** 86 * Listener used to propagate events indicating when children are added 87 * and/or removed from a view group. 88 * This field should be made private, so it is hidden from the SDK. 89 * {@hide} 90 */ 91 protected OnHierarchyChangeListener mOnHierarchyChangeListener; 92 93 // The view contained within this ViewGroup that has or contains focus. 94 private View mFocused; 95 96 /** 97 * A Transformation used when drawing children, to 98 * apply on the child being drawn. 99 */ 100 private final Transformation mChildTransformation = new Transformation(); 101 102 /** 103 * Used to track the current invalidation region. 104 */ 105 private RectF mInvalidateRegion; 106 107 /** 108 * A Transformation used to calculate a correct 109 * invalidation area when the application is autoscaled. 110 */ 111 private Transformation mInvalidationTransformation; 112 113 // View currently under an ongoing drag 114 private View mCurrentDragView; 115 116 // Metadata about the ongoing drag 117 private DragEvent mCurrentDrag; 118 private HashSet<View> mDragNotifiedChildren; 119 120 // Does this group have a child that can accept the current drag payload? 121 private boolean mChildAcceptsDrag; 122 123 // Used during drag dispatch 124 private final PointF mLocalPoint = new PointF(); 125 126 // Layout animation 127 private LayoutAnimationController mLayoutAnimationController; 128 private Animation.AnimationListener mAnimationListener; 129 130 // First touch target in the linked list of touch targets. 131 private TouchTarget mFirstTouchTarget; 132 133 // For debugging only. You can see these in hierarchyviewer. 134 @SuppressWarnings({"FieldCanBeLocal", "UnusedDeclaration"}) 135 @ViewDebug.ExportedProperty(category = "events") 136 private long mLastTouchDownTime; 137 @ViewDebug.ExportedProperty(category = "events") 138 private int mLastTouchDownIndex = -1; 139 @SuppressWarnings({"FieldCanBeLocal", "UnusedDeclaration"}) 140 @ViewDebug.ExportedProperty(category = "events") 141 private float mLastTouchDownX; 142 @SuppressWarnings({"FieldCanBeLocal", "UnusedDeclaration"}) 143 @ViewDebug.ExportedProperty(category = "events") 144 private float mLastTouchDownY; 145 146 // First hover target in the linked list of hover targets. 147 // The hover targets are children which have received ACTION_HOVER_ENTER. 148 // They might not have actually handled the hover event, but we will 149 // continue sending hover events to them as long as the pointer remains over 150 // their bounds and the view group does not intercept hover. 151 private HoverTarget mFirstHoverTarget; 152 153 // True if the view group itself received a hover event. 154 // It might not have actually handled the hover event. 155 private boolean mHoveredSelf; 156 157 /** 158 * Internal flags. 159 * 160 * This field should be made private, so it is hidden from the SDK. 161 * {@hide} 162 */ 163 protected int mGroupFlags; 164 165 // When set, ViewGroup invalidates only the child's rectangle 166 // Set by default 167 private static final int FLAG_CLIP_CHILDREN = 0x1; 168 169 // When set, ViewGroup excludes the padding area from the invalidate rectangle 170 // Set by default 171 private static final int FLAG_CLIP_TO_PADDING = 0x2; 172 173 // When set, dispatchDraw() will invoke invalidate(); this is set by drawChild() when 174 // a child needs to be invalidated and FLAG_OPTIMIZE_INVALIDATE is set 175 private static final int FLAG_INVALIDATE_REQUIRED = 0x4; 176 177 // When set, dispatchDraw() will run the layout animation and unset the flag 178 private static final int FLAG_RUN_ANIMATION = 0x8; 179 180 // When set, there is either no layout animation on the ViewGroup or the layout 181 // animation is over 182 // Set by default 183 private static final int FLAG_ANIMATION_DONE = 0x10; 184 185 // If set, this ViewGroup has padding; if unset there is no padding and we don't need 186 // to clip it, even if FLAG_CLIP_TO_PADDING is set 187 private static final int FLAG_PADDING_NOT_NULL = 0x20; 188 189 // When set, this ViewGroup caches its children in a Bitmap before starting a layout animation 190 // Set by default 191 private static final int FLAG_ANIMATION_CACHE = 0x40; 192 193 // When set, this ViewGroup converts calls to invalidate(Rect) to invalidate() during a 194 // layout animation; this avoid clobbering the hierarchy 195 // Automatically set when the layout animation starts, depending on the animation's 196 // characteristics 197 private static final int FLAG_OPTIMIZE_INVALIDATE = 0x80; 198 199 // When set, the next call to drawChild() will clear mChildTransformation's matrix 200 private static final int FLAG_CLEAR_TRANSFORMATION = 0x100; 201 202 // When set, this ViewGroup invokes mAnimationListener.onAnimationEnd() and removes 203 // the children's Bitmap caches if necessary 204 // This flag is set when the layout animation is over (after FLAG_ANIMATION_DONE is set) 205 private static final int FLAG_NOTIFY_ANIMATION_LISTENER = 0x200; 206 207 /** 208 * When set, the drawing method will call {@link #getChildDrawingOrder(int, int)} 209 * to get the index of the child to draw for that iteration. 210 * 211 * @hide 212 */ 213 protected static final int FLAG_USE_CHILD_DRAWING_ORDER = 0x400; 214 215 /** 216 * When set, this ViewGroup supports static transformations on children; this causes 217 * {@link #getChildStaticTransformation(View, android.view.animation.Transformation)} to be 218 * invoked when a child is drawn. 219 * 220 * Any subclass overriding 221 * {@link #getChildStaticTransformation(View, android.view.animation.Transformation)} should 222 * set this flags in {@link #mGroupFlags}. 223 * 224 * {@hide} 225 */ 226 protected static final int FLAG_SUPPORT_STATIC_TRANSFORMATIONS = 0x800; 227 228 // When the previous drawChild() invocation used an alpha value that was lower than 229 // 1.0 and set it in mCachePaint 230 private static final int FLAG_ALPHA_LOWER_THAN_ONE = 0x1000; 231 232 /** 233 * When set, this ViewGroup's drawable states also include those 234 * of its children. 235 */ 236 private static final int FLAG_ADD_STATES_FROM_CHILDREN = 0x2000; 237 238 /** 239 * When set, this ViewGroup tries to always draw its children using their drawing cache. 240 */ 241 private static final int FLAG_ALWAYS_DRAWN_WITH_CACHE = 0x4000; 242 243 /** 244 * When set, and if FLAG_ALWAYS_DRAWN_WITH_CACHE is not set, this ViewGroup will try to 245 * draw its children with their drawing cache. 246 */ 247 private static final int FLAG_CHILDREN_DRAWN_WITH_CACHE = 0x8000; 248 249 /** 250 * When set, this group will go through its list of children to notify them of 251 * any drawable state change. 252 */ 253 private static final int FLAG_NOTIFY_CHILDREN_ON_DRAWABLE_STATE_CHANGE = 0x10000; 254 255 private static final int FLAG_MASK_FOCUSABILITY = 0x60000; 256 257 /** 258 * This view will get focus before any of its descendants. 259 */ 260 public static final int FOCUS_BEFORE_DESCENDANTS = 0x20000; 261 262 /** 263 * This view will get focus only if none of its descendants want it. 264 */ 265 public static final int FOCUS_AFTER_DESCENDANTS = 0x40000; 266 267 /** 268 * This view will block any of its descendants from getting focus, even 269 * if they are focusable. 270 */ 271 public static final int FOCUS_BLOCK_DESCENDANTS = 0x60000; 272 273 /** 274 * Used to map between enum in attrubutes and flag values. 275 */ 276 private static final int[] DESCENDANT_FOCUSABILITY_FLAGS = 277 {FOCUS_BEFORE_DESCENDANTS, FOCUS_AFTER_DESCENDANTS, 278 FOCUS_BLOCK_DESCENDANTS}; 279 280 /** 281 * When set, this ViewGroup should not intercept touch events. 282 * {@hide} 283 */ 284 protected static final int FLAG_DISALLOW_INTERCEPT = 0x80000; 285 286 /** 287 * When set, this ViewGroup will split MotionEvents to multiple child Views when appropriate. 288 */ 289 private static final int FLAG_SPLIT_MOTION_EVENTS = 0x200000; 290 291 /** 292 * Indicates which types of drawing caches are to be kept in memory. 293 * This field should be made private, so it is hidden from the SDK. 294 * {@hide} 295 */ 296 protected int mPersistentDrawingCache; 297 298 /** 299 * Used to indicate that no drawing cache should be kept in memory. 300 */ 301 public static final int PERSISTENT_NO_CACHE = 0x0; 302 303 /** 304 * Used to indicate that the animation drawing cache should be kept in memory. 305 */ 306 public static final int PERSISTENT_ANIMATION_CACHE = 0x1; 307 308 /** 309 * Used to indicate that the scrolling drawing cache should be kept in memory. 310 */ 311 public static final int PERSISTENT_SCROLLING_CACHE = 0x2; 312 313 /** 314 * Used to indicate that all drawing caches should be kept in memory. 315 */ 316 public static final int PERSISTENT_ALL_CACHES = 0x3; 317 318 /** 319 * We clip to padding when FLAG_CLIP_TO_PADDING and FLAG_PADDING_NOT_NULL 320 * are set at the same time. 321 */ 322 protected static final int CLIP_TO_PADDING_MASK = FLAG_CLIP_TO_PADDING | FLAG_PADDING_NOT_NULL; 323 324 // Index of the child's left position in the mLocation array 325 private static final int CHILD_LEFT_INDEX = 0; 326 // Index of the child's top position in the mLocation array 327 private static final int CHILD_TOP_INDEX = 1; 328 329 // Child views of this ViewGroup 330 private View[] mChildren; 331 // Number of valid children in the mChildren array, the rest should be null or not 332 // considered as children 333 334 private boolean mLayoutSuppressed = false; 335 336 private int mChildrenCount; 337 338 private static final int ARRAY_INITIAL_CAPACITY = 12; 339 private static final int ARRAY_CAPACITY_INCREMENT = 12; 340 341 // Used to draw cached views 342 private final Paint mCachePaint = new Paint(); 343 344 // Used to animate add/remove changes in layout 345 private LayoutTransition mTransition; 346 347 // The set of views that are currently being transitioned. This list is used to track views 348 // being removed that should not actually be removed from the parent yet because they are 349 // being animated. 350 private ArrayList<View> mTransitioningViews; 351 352 // List of children changing visibility. This is used to potentially keep rendering 353 // views during a transition when they otherwise would have become gone/invisible 354 private ArrayList<View> mVisibilityChangingChildren; 355 356 // Indicates whether this container will use its children layers to draw 357 @ViewDebug.ExportedProperty(category = "drawing") 358 private boolean mDrawLayers = true; 359 360 public ViewGroup(Context context) { 361 super(context); 362 initViewGroup(); 363 } 364 365 public ViewGroup(Context context, AttributeSet attrs) { 366 super(context, attrs); 367 initViewGroup(); 368 initFromAttributes(context, attrs); 369 } 370 371 public ViewGroup(Context context, AttributeSet attrs, int defStyle) { 372 super(context, attrs, defStyle); 373 initViewGroup(); 374 initFromAttributes(context, attrs); 375 } 376 377 private void initViewGroup() { 378 // ViewGroup doesn't draw by default 379 setFlags(WILL_NOT_DRAW, DRAW_MASK); 380 mGroupFlags |= FLAG_CLIP_CHILDREN; 381 mGroupFlags |= FLAG_CLIP_TO_PADDING; 382 mGroupFlags |= FLAG_ANIMATION_DONE; 383 mGroupFlags |= FLAG_ANIMATION_CACHE; 384 mGroupFlags |= FLAG_ALWAYS_DRAWN_WITH_CACHE; 385 386 if (mContext.getApplicationInfo().targetSdkVersion >= Build.VERSION_CODES.HONEYCOMB) { 387 mGroupFlags |= FLAG_SPLIT_MOTION_EVENTS; 388 } 389 390 setDescendantFocusability(FOCUS_BEFORE_DESCENDANTS); 391 392 mChildren = new View[ARRAY_INITIAL_CAPACITY]; 393 mChildrenCount = 0; 394 395 mCachePaint.setDither(false); 396 397 mPersistentDrawingCache = PERSISTENT_SCROLLING_CACHE; 398 } 399 400 private void initFromAttributes(Context context, AttributeSet attrs) { 401 TypedArray a = context.obtainStyledAttributes(attrs, 402 R.styleable.ViewGroup); 403 404 final int N = a.getIndexCount(); 405 for (int i = 0; i < N; i++) { 406 int attr = a.getIndex(i); 407 switch (attr) { 408 case R.styleable.ViewGroup_clipChildren: 409 setClipChildren(a.getBoolean(attr, true)); 410 break; 411 case R.styleable.ViewGroup_clipToPadding: 412 setClipToPadding(a.getBoolean(attr, true)); 413 break; 414 case R.styleable.ViewGroup_animationCache: 415 setAnimationCacheEnabled(a.getBoolean(attr, true)); 416 break; 417 case R.styleable.ViewGroup_persistentDrawingCache: 418 setPersistentDrawingCache(a.getInt(attr, PERSISTENT_SCROLLING_CACHE)); 419 break; 420 case R.styleable.ViewGroup_addStatesFromChildren: 421 setAddStatesFromChildren(a.getBoolean(attr, false)); 422 break; 423 case R.styleable.ViewGroup_alwaysDrawnWithCache: 424 setAlwaysDrawnWithCacheEnabled(a.getBoolean(attr, true)); 425 break; 426 case R.styleable.ViewGroup_layoutAnimation: 427 int id = a.getResourceId(attr, -1); 428 if (id > 0) { 429 setLayoutAnimation(AnimationUtils.loadLayoutAnimation(mContext, id)); 430 } 431 break; 432 case R.styleable.ViewGroup_descendantFocusability: 433 setDescendantFocusability(DESCENDANT_FOCUSABILITY_FLAGS[a.getInt(attr, 0)]); 434 break; 435 case R.styleable.ViewGroup_splitMotionEvents: 436 setMotionEventSplittingEnabled(a.getBoolean(attr, false)); 437 break; 438 case R.styleable.ViewGroup_animateLayoutChanges: 439 boolean animateLayoutChanges = a.getBoolean(attr, false); 440 if (animateLayoutChanges) { 441 setLayoutTransition(new LayoutTransition()); 442 } 443 break; 444 } 445 } 446 447 a.recycle(); 448 } 449 450 /** 451 * Gets the descendant focusability of this view group. The descendant 452 * focusability defines the relationship between this view group and its 453 * descendants when looking for a view to take focus in 454 * {@link #requestFocus(int, android.graphics.Rect)}. 455 * 456 * @return one of {@link #FOCUS_BEFORE_DESCENDANTS}, {@link #FOCUS_AFTER_DESCENDANTS}, 457 * {@link #FOCUS_BLOCK_DESCENDANTS}. 458 */ 459 @ViewDebug.ExportedProperty(category = "focus", mapping = { 460 @ViewDebug.IntToString(from = FOCUS_BEFORE_DESCENDANTS, to = "FOCUS_BEFORE_DESCENDANTS"), 461 @ViewDebug.IntToString(from = FOCUS_AFTER_DESCENDANTS, to = "FOCUS_AFTER_DESCENDANTS"), 462 @ViewDebug.IntToString(from = FOCUS_BLOCK_DESCENDANTS, to = "FOCUS_BLOCK_DESCENDANTS") 463 }) 464 public int getDescendantFocusability() { 465 return mGroupFlags & FLAG_MASK_FOCUSABILITY; 466 } 467 468 /** 469 * Set the descendant focusability of this view group. This defines the relationship 470 * between this view group and its descendants when looking for a view to 471 * take focus in {@link #requestFocus(int, android.graphics.Rect)}. 472 * 473 * @param focusability one of {@link #FOCUS_BEFORE_DESCENDANTS}, {@link #FOCUS_AFTER_DESCENDANTS}, 474 * {@link #FOCUS_BLOCK_DESCENDANTS}. 475 */ 476 public void setDescendantFocusability(int focusability) { 477 switch (focusability) { 478 case FOCUS_BEFORE_DESCENDANTS: 479 case FOCUS_AFTER_DESCENDANTS: 480 case FOCUS_BLOCK_DESCENDANTS: 481 break; 482 default: 483 throw new IllegalArgumentException("must be one of FOCUS_BEFORE_DESCENDANTS, " 484 + "FOCUS_AFTER_DESCENDANTS, FOCUS_BLOCK_DESCENDANTS"); 485 } 486 mGroupFlags &= ~FLAG_MASK_FOCUSABILITY; 487 mGroupFlags |= (focusability & FLAG_MASK_FOCUSABILITY); 488 } 489 490 /** 491 * {@inheritDoc} 492 */ 493 @Override 494 void handleFocusGainInternal(int direction, Rect previouslyFocusedRect) { 495 if (mFocused != null) { 496 mFocused.unFocus(); 497 mFocused = null; 498 } 499 super.handleFocusGainInternal(direction, previouslyFocusedRect); 500 } 501 502 /** 503 * {@inheritDoc} 504 */ 505 public void requestChildFocus(View child, View focused) { 506 if (DBG) { 507 System.out.println(this + " requestChildFocus()"); 508 } 509 if (getDescendantFocusability() == FOCUS_BLOCK_DESCENDANTS) { 510 return; 511 } 512 513 // Unfocus us, if necessary 514 super.unFocus(); 515 516 // We had a previous notion of who had focus. Clear it. 517 if (mFocused != child) { 518 if (mFocused != null) { 519 mFocused.unFocus(); 520 } 521 522 mFocused = child; 523 } 524 if (mParent != null) { 525 mParent.requestChildFocus(this, focused); 526 } 527 } 528 529 /** 530 * {@inheritDoc} 531 */ 532 public void focusableViewAvailable(View v) { 533 if (mParent != null 534 // shortcut: don't report a new focusable view if we block our descendants from 535 // getting focus 536 && (getDescendantFocusability() != FOCUS_BLOCK_DESCENDANTS) 537 // shortcut: don't report a new focusable view if we already are focused 538 // (and we don't prefer our descendants) 539 // 540 // note: knowing that mFocused is non-null is not a good enough reason 541 // to break the traversal since in that case we'd actually have to find 542 // the focused view and make sure it wasn't FOCUS_AFTER_DESCENDANTS and 543 // an ancestor of v; this will get checked for at ViewAncestor 544 && !(isFocused() && getDescendantFocusability() != FOCUS_AFTER_DESCENDANTS)) { 545 mParent.focusableViewAvailable(v); 546 } 547 } 548 549 /** 550 * {@inheritDoc} 551 */ 552 public boolean showContextMenuForChild(View originalView) { 553 return mParent != null && mParent.showContextMenuForChild(originalView); 554 } 555 556 /** 557 * {@inheritDoc} 558 */ 559 public ActionMode startActionModeForChild(View originalView, ActionMode.Callback callback) { 560 return mParent != null ? mParent.startActionModeForChild(originalView, callback) : null; 561 } 562 563 /** 564 * Find the nearest view in the specified direction that wants to take 565 * focus. 566 * 567 * @param focused The view that currently has focus 568 * @param direction One of FOCUS_UP, FOCUS_DOWN, FOCUS_LEFT, and 569 * FOCUS_RIGHT, or 0 for not applicable. 570 */ 571 public View focusSearch(View focused, int direction) { 572 if (isRootNamespace()) { 573 // root namespace means we should consider ourselves the top of the 574 // tree for focus searching; otherwise we could be focus searching 575 // into other tabs. see LocalActivityManager and TabHost for more info 576 return FocusFinder.getInstance().findNextFocus(this, focused, direction); 577 } else if (mParent != null) { 578 return mParent.focusSearch(focused, direction); 579 } 580 return null; 581 } 582 583 /** 584 * {@inheritDoc} 585 */ 586 public boolean requestChildRectangleOnScreen(View child, Rect rectangle, boolean immediate) { 587 return false; 588 } 589 590 /** 591 * {@inheritDoc} 592 */ 593 public boolean requestSendAccessibilityEvent(View child, AccessibilityEvent event) { 594 ViewParent parent = getParent(); 595 if (parent == null) { 596 return false; 597 } 598 final boolean propagate = onRequestSendAccessibilityEvent(child, event); 599 //noinspection SimplifiableIfStatement 600 if (!propagate) { 601 return false; 602 } 603 return parent.requestSendAccessibilityEvent(this, event); 604 } 605 606 /** 607 * Called when a child has requested sending an {@link AccessibilityEvent} and 608 * gives an opportunity to its parent to augment the event. 609 * 610 * @param child The child which requests sending the event. 611 * @param event The event to be sent. 612 * @return True if the event should be sent. 613 * 614 * @see #requestSendAccessibilityEvent(View, AccessibilityEvent) 615 */ 616 public boolean onRequestSendAccessibilityEvent(View child, AccessibilityEvent event) { 617 return true; 618 } 619 620 /** 621 * {@inheritDoc} 622 */ 623 @Override 624 public boolean dispatchUnhandledMove(View focused, int direction) { 625 return mFocused != null && 626 mFocused.dispatchUnhandledMove(focused, direction); 627 } 628 629 /** 630 * {@inheritDoc} 631 */ 632 public void clearChildFocus(View child) { 633 if (DBG) { 634 System.out.println(this + " clearChildFocus()"); 635 } 636 637 mFocused = null; 638 if (mParent != null) { 639 mParent.clearChildFocus(this); 640 } 641 } 642 643 /** 644 * {@inheritDoc} 645 */ 646 @Override 647 public void clearFocus() { 648 super.clearFocus(); 649 650 // clear any child focus if it exists 651 if (mFocused != null) { 652 mFocused.clearFocus(); 653 } 654 } 655 656 /** 657 * {@inheritDoc} 658 */ 659 @Override 660 void unFocus() { 661 if (DBG) { 662 System.out.println(this + " unFocus()"); 663 } 664 665 super.unFocus(); 666 if (mFocused != null) { 667 mFocused.unFocus(); 668 } 669 mFocused = null; 670 } 671 672 /** 673 * Returns the focused child of this view, if any. The child may have focus 674 * or contain focus. 675 * 676 * @return the focused child or null. 677 */ 678 public View getFocusedChild() { 679 return mFocused; 680 } 681 682 /** 683 * Returns true if this view has or contains focus 684 * 685 * @return true if this view has or contains focus 686 */ 687 @Override 688 public boolean hasFocus() { 689 return (mPrivateFlags & FOCUSED) != 0 || mFocused != null; 690 } 691 692 /* 693 * (non-Javadoc) 694 * 695 * @see android.view.View#findFocus() 696 */ 697 @Override 698 public View findFocus() { 699 if (DBG) { 700 System.out.println("Find focus in " + this + ": flags=" 701 + isFocused() + ", child=" + mFocused); 702 } 703 704 if (isFocused()) { 705 return this; 706 } 707 708 if (mFocused != null) { 709 return mFocused.findFocus(); 710 } 711 return null; 712 } 713 714 /** 715 * {@inheritDoc} 716 */ 717 @Override 718 public boolean hasFocusable() { 719 if ((mViewFlags & VISIBILITY_MASK) != VISIBLE) { 720 return false; 721 } 722 723 if (isFocusable()) { 724 return true; 725 } 726 727 final int descendantFocusability = getDescendantFocusability(); 728 if (descendantFocusability != FOCUS_BLOCK_DESCENDANTS) { 729 final int count = mChildrenCount; 730 final View[] children = mChildren; 731 732 for (int i = 0; i < count; i++) { 733 final View child = children[i]; 734 if (child.hasFocusable()) { 735 return true; 736 } 737 } 738 } 739 740 return false; 741 } 742 743 /** 744 * {@inheritDoc} 745 */ 746 @Override 747 public void addFocusables(ArrayList<View> views, int direction) { 748 addFocusables(views, direction, FOCUSABLES_TOUCH_MODE); 749 } 750 751 /** 752 * {@inheritDoc} 753 */ 754 @Override 755 public void addFocusables(ArrayList<View> views, int direction, int focusableMode) { 756 final int focusableCount = views.size(); 757 758 final int descendantFocusability = getDescendantFocusability(); 759 760 if (descendantFocusability != FOCUS_BLOCK_DESCENDANTS) { 761 final int count = mChildrenCount; 762 final View[] children = mChildren; 763 764 for (int i = 0; i < count; i++) { 765 final View child = children[i]; 766 if ((child.mViewFlags & VISIBILITY_MASK) == VISIBLE) { 767 child.addFocusables(views, direction, focusableMode); 768 } 769 } 770 } 771 772 // we add ourselves (if focusable) in all cases except for when we are 773 // FOCUS_AFTER_DESCENDANTS and there are some descendants focusable. this is 774 // to avoid the focus search finding layouts when a more precise search 775 // among the focusable children would be more interesting. 776 if ( 777 descendantFocusability != FOCUS_AFTER_DESCENDANTS || 778 // No focusable descendants 779 (focusableCount == views.size())) { 780 super.addFocusables(views, direction, focusableMode); 781 } 782 } 783 784 @Override 785 public void findViewsWithText(ArrayList<View> outViews, CharSequence text) { 786 final int childrenCount = mChildrenCount; 787 final View[] children = mChildren; 788 for (int i = 0; i < childrenCount; i++) { 789 View child = children[i]; 790 if ((child.mViewFlags & VISIBILITY_MASK) == VISIBLE) { 791 child.findViewsWithText(outViews, text); 792 } 793 } 794 } 795 796 /** 797 * {@inheritDoc} 798 */ 799 @Override 800 public void dispatchWindowFocusChanged(boolean hasFocus) { 801 super.dispatchWindowFocusChanged(hasFocus); 802 final int count = mChildrenCount; 803 final View[] children = mChildren; 804 for (int i = 0; i < count; i++) { 805 children[i].dispatchWindowFocusChanged(hasFocus); 806 } 807 } 808 809 /** 810 * {@inheritDoc} 811 */ 812 @Override 813 public void addTouchables(ArrayList<View> views) { 814 super.addTouchables(views); 815 816 final int count = mChildrenCount; 817 final View[] children = mChildren; 818 819 for (int i = 0; i < count; i++) { 820 final View child = children[i]; 821 if ((child.mViewFlags & VISIBILITY_MASK) == VISIBLE) { 822 child.addTouchables(views); 823 } 824 } 825 } 826 827 /** 828 * {@inheritDoc} 829 */ 830 @Override 831 public void dispatchDisplayHint(int hint) { 832 super.dispatchDisplayHint(hint); 833 final int count = mChildrenCount; 834 final View[] children = mChildren; 835 for (int i = 0; i < count; i++) { 836 children[i].dispatchDisplayHint(hint); 837 } 838 } 839 840 /** 841 * @hide 842 * @param child 843 * @param visibility 844 */ 845 void onChildVisibilityChanged(View child, int visibility) { 846 if (mTransition != null) { 847 if (visibility == VISIBLE) { 848 mTransition.showChild(this, child); 849 } else { 850 mTransition.hideChild(this, child); 851 } 852 if (visibility != VISIBLE) { 853 // Only track this on disappearing views - appearing views are already visible 854 // and don't need special handling during drawChild() 855 if (mVisibilityChangingChildren == null) { 856 mVisibilityChangingChildren = new ArrayList<View>(); 857 } 858 mVisibilityChangingChildren.add(child); 859 if (mTransitioningViews != null && mTransitioningViews.contains(child)) { 860 addDisappearingView(child); 861 } 862 } 863 } 864 865 // in all cases, for drags 866 if (mCurrentDrag != null) { 867 if (visibility == VISIBLE) { 868 notifyChildOfDrag(child); 869 } 870 } 871 } 872 873 /** 874 * {@inheritDoc} 875 */ 876 @Override 877 protected void dispatchVisibilityChanged(View changedView, int visibility) { 878 super.dispatchVisibilityChanged(changedView, visibility); 879 final int count = mChildrenCount; 880 final View[] children = mChildren; 881 for (int i = 0; i < count; i++) { 882 children[i].dispatchVisibilityChanged(changedView, visibility); 883 } 884 } 885 886 /** 887 * {@inheritDoc} 888 */ 889 @Override 890 public void dispatchWindowVisibilityChanged(int visibility) { 891 super.dispatchWindowVisibilityChanged(visibility); 892 final int count = mChildrenCount; 893 final View[] children = mChildren; 894 for (int i = 0; i < count; i++) { 895 children[i].dispatchWindowVisibilityChanged(visibility); 896 } 897 } 898 899 /** 900 * {@inheritDoc} 901 */ 902 @Override 903 public void dispatchConfigurationChanged(Configuration newConfig) { 904 super.dispatchConfigurationChanged(newConfig); 905 final int count = mChildrenCount; 906 final View[] children = mChildren; 907 for (int i = 0; i < count; i++) { 908 children[i].dispatchConfigurationChanged(newConfig); 909 } 910 } 911 912 /** 913 * {@inheritDoc} 914 */ 915 public void recomputeViewAttributes(View child) { 916 if (mAttachInfo != null && !mAttachInfo.mRecomputeGlobalAttributes) { 917 ViewParent parent = mParent; 918 if (parent != null) parent.recomputeViewAttributes(this); 919 } 920 } 921 922 @Override 923 void dispatchCollectViewAttributes(int visibility) { 924 visibility |= mViewFlags&VISIBILITY_MASK; 925 super.dispatchCollectViewAttributes(visibility); 926 final int count = mChildrenCount; 927 final View[] children = mChildren; 928 for (int i = 0; i < count; i++) { 929 children[i].dispatchCollectViewAttributes(visibility); 930 } 931 } 932 933 /** 934 * {@inheritDoc} 935 */ 936 public void bringChildToFront(View child) { 937 int index = indexOfChild(child); 938 if (index >= 0) { 939 removeFromArray(index); 940 addInArray(child, mChildrenCount); 941 child.mParent = this; 942 } 943 } 944 945 /** 946 * {@inheritDoc} 947 * 948 * !!! TODO: write real docs 949 */ 950 @Override 951 public boolean dispatchDragEvent(DragEvent event) { 952 boolean retval = false; 953 final float tx = event.mX; 954 final float ty = event.mY; 955 956 ViewAncestor root = getViewAncestor(); 957 958 // Dispatch down the view hierarchy 959 switch (event.mAction) { 960 case DragEvent.ACTION_DRAG_STARTED: { 961 // clear state to recalculate which views we drag over 962 mCurrentDragView = null; 963 964 // Set up our tracking of drag-started notifications 965 mCurrentDrag = DragEvent.obtain(event); 966 if (mDragNotifiedChildren == null) { 967 mDragNotifiedChildren = new HashSet<View>(); 968 } else { 969 mDragNotifiedChildren.clear(); 970 } 971 972 // Now dispatch down to our children, caching the responses 973 mChildAcceptsDrag = false; 974 final int count = mChildrenCount; 975 final View[] children = mChildren; 976 for (int i = 0; i < count; i++) { 977 final View child = children[i]; 978 child.mPrivateFlags2 &= ~View.DRAG_MASK; 979 if (child.getVisibility() == VISIBLE) { 980 final boolean handled = notifyChildOfDrag(children[i]); 981 if (handled) { 982 mChildAcceptsDrag = true; 983 } 984 } 985 } 986 987 // Return HANDLED if one of our children can accept the drag 988 if (mChildAcceptsDrag) { 989 retval = true; 990 } 991 } break; 992 993 case DragEvent.ACTION_DRAG_ENDED: { 994 // Release the bookkeeping now that the drag lifecycle has ended 995 if (mDragNotifiedChildren != null) { 996 for (View child : mDragNotifiedChildren) { 997 // If a child was notified about an ongoing drag, it's told that it's over 998 child.dispatchDragEvent(event); 999 child.mPrivateFlags2 &= ~View.DRAG_MASK; 1000 child.refreshDrawableState(); 1001 } 1002 1003 mDragNotifiedChildren.clear(); 1004 mCurrentDrag.recycle(); 1005 mCurrentDrag = null; 1006 } 1007 1008 // We consider drag-ended to have been handled if one of our children 1009 // had offered to handle the drag. 1010 if (mChildAcceptsDrag) { 1011 retval = true; 1012 } 1013 } break; 1014 1015 case DragEvent.ACTION_DRAG_LOCATION: { 1016 // Find the [possibly new] drag target 1017 final View target = findFrontmostDroppableChildAt(event.mX, event.mY, mLocalPoint); 1018 1019 // If we've changed apparent drag target, tell the view root which view 1020 // we're over now [for purposes of the eventual drag-recipient-changed 1021 // notifications to the framework] and tell the new target that the drag 1022 // has entered its bounds. The root will see setDragFocus() calls all 1023 // the way down to the final leaf view that is handling the LOCATION event 1024 // before reporting the new potential recipient to the framework. 1025 if (mCurrentDragView != target) { 1026 root.setDragFocus(target); 1027 1028 final int action = event.mAction; 1029 // If we've dragged off of a child view, send it the EXITED message 1030 if (mCurrentDragView != null) { 1031 final View view = mCurrentDragView; 1032 event.mAction = DragEvent.ACTION_DRAG_EXITED; 1033 view.dispatchDragEvent(event); 1034 view.mPrivateFlags2 &= ~View.DRAG_HOVERED; 1035 view.refreshDrawableState(); 1036 } 1037 mCurrentDragView = target; 1038 1039 // If we've dragged over a new child view, send it the ENTERED message 1040 if (target != null) { 1041 event.mAction = DragEvent.ACTION_DRAG_ENTERED; 1042 target.dispatchDragEvent(event); 1043 target.mPrivateFlags2 |= View.DRAG_HOVERED; 1044 target.refreshDrawableState(); 1045 } 1046 event.mAction = action; // restore the event's original state 1047 } 1048 1049 // Dispatch the actual drag location notice, localized into its coordinates 1050 if (target != null) { 1051 event.mX = mLocalPoint.x; 1052 event.mY = mLocalPoint.y; 1053 1054 retval = target.dispatchDragEvent(event); 1055 1056 event.mX = tx; 1057 event.mY = ty; 1058 } 1059 } break; 1060 1061 /* Entered / exited dispatch 1062 * 1063 * DRAG_ENTERED is not dispatched downwards from ViewGroup. The reason for this is 1064 * that we're about to get the corresponding LOCATION event, which we will use to 1065 * determine which of our children is the new target; at that point we will 1066 * push a DRAG_ENTERED down to the new target child [which may itself be a ViewGroup]. 1067 * 1068 * DRAG_EXITED *is* dispatched all the way down immediately: once we know the 1069 * drag has left this ViewGroup, we know by definition that every contained subview 1070 * is also no longer under the drag point. 1071 */ 1072 1073 case DragEvent.ACTION_DRAG_EXITED: { 1074 if (mCurrentDragView != null) { 1075 final View view = mCurrentDragView; 1076 view.dispatchDragEvent(event); 1077 view.mPrivateFlags2 &= ~View.DRAG_HOVERED; 1078 view.refreshDrawableState(); 1079 1080 mCurrentDragView = null; 1081 } 1082 } break; 1083 1084 case DragEvent.ACTION_DROP: { 1085 if (ViewDebug.DEBUG_DRAG) Log.d(View.VIEW_LOG_TAG, "Drop event: " + event); 1086 View target = findFrontmostDroppableChildAt(event.mX, event.mY, mLocalPoint); 1087 if (target != null) { 1088 if (ViewDebug.DEBUG_DRAG) Log.d(View.VIEW_LOG_TAG, " dispatch drop to " + target); 1089 event.mX = mLocalPoint.x; 1090 event.mY = mLocalPoint.y; 1091 retval = target.dispatchDragEvent(event); 1092 event.mX = tx; 1093 event.mY = ty; 1094 } else { 1095 if (ViewDebug.DEBUG_DRAG) { 1096 Log.d(View.VIEW_LOG_TAG, " not dropped on an accepting view"); 1097 } 1098 } 1099 } break; 1100 } 1101 1102 // If none of our children could handle the event, try here 1103 if (!retval) { 1104 // Call up to the View implementation that dispatches to installed listeners 1105 retval = super.dispatchDragEvent(event); 1106 } 1107 return retval; 1108 } 1109 1110 // Find the frontmost child view that lies under the given point, and calculate 1111 // the position within its own local coordinate system. 1112 View findFrontmostDroppableChildAt(float x, float y, PointF outLocalPoint) { 1113 final int count = mChildrenCount; 1114 final View[] children = mChildren; 1115 for (int i = count - 1; i >= 0; i--) { 1116 final View child = children[i]; 1117 if (!child.canAcceptDrag()) { 1118 continue; 1119 } 1120 1121 if (isTransformedTouchPointInView(x, y, child, outLocalPoint)) { 1122 return child; 1123 } 1124 } 1125 return null; 1126 } 1127 1128 boolean notifyChildOfDrag(View child) { 1129 if (ViewDebug.DEBUG_DRAG) { 1130 Log.d(View.VIEW_LOG_TAG, "Sending drag-started to view: " + child); 1131 } 1132 1133 boolean canAccept = false; 1134 if (! mDragNotifiedChildren.contains(child)) { 1135 mDragNotifiedChildren.add(child); 1136 canAccept = child.dispatchDragEvent(mCurrentDrag); 1137 if (canAccept && !child.canAcceptDrag()) { 1138 child.mPrivateFlags2 |= View.DRAG_CAN_ACCEPT; 1139 child.refreshDrawableState(); 1140 } 1141 } 1142 return canAccept; 1143 } 1144 1145 @Override 1146 public void dispatchSystemUiVisibilityChanged(int visible) { 1147 super.dispatchSystemUiVisibilityChanged(visible); 1148 1149 final int count = mChildrenCount; 1150 final View[] children = mChildren; 1151 for (int i=0; i <count; i++) { 1152 final View child = children[i]; 1153 child.dispatchSystemUiVisibilityChanged(visible); 1154 } 1155 } 1156 1157 /** 1158 * {@inheritDoc} 1159 */ 1160 @Override 1161 public boolean dispatchKeyEventPreIme(KeyEvent event) { 1162 if ((mPrivateFlags & (FOCUSED | HAS_BOUNDS)) == (FOCUSED | HAS_BOUNDS)) { 1163 return super.dispatchKeyEventPreIme(event); 1164 } else if (mFocused != null && (mFocused.mPrivateFlags & HAS_BOUNDS) == HAS_BOUNDS) { 1165 return mFocused.dispatchKeyEventPreIme(event); 1166 } 1167 return false; 1168 } 1169 1170 /** 1171 * {@inheritDoc} 1172 */ 1173 @Override 1174 public boolean dispatchKeyEvent(KeyEvent event) { 1175 if (mInputEventConsistencyVerifier != null) { 1176 mInputEventConsistencyVerifier.onKeyEvent(event, 1); 1177 } 1178 1179 if ((mPrivateFlags & (FOCUSED | HAS_BOUNDS)) == (FOCUSED | HAS_BOUNDS)) { 1180 if (super.dispatchKeyEvent(event)) { 1181 return true; 1182 } 1183 } else if (mFocused != null && (mFocused.mPrivateFlags & HAS_BOUNDS) == HAS_BOUNDS) { 1184 if (mFocused.dispatchKeyEvent(event)) { 1185 return true; 1186 } 1187 } 1188 1189 if (mInputEventConsistencyVerifier != null) { 1190 mInputEventConsistencyVerifier.onUnhandledEvent(event, 1); 1191 } 1192 return false; 1193 } 1194 1195 /** 1196 * {@inheritDoc} 1197 */ 1198 @Override 1199 public boolean dispatchKeyShortcutEvent(KeyEvent event) { 1200 if ((mPrivateFlags & (FOCUSED | HAS_BOUNDS)) == (FOCUSED | HAS_BOUNDS)) { 1201 return super.dispatchKeyShortcutEvent(event); 1202 } else if (mFocused != null && (mFocused.mPrivateFlags & HAS_BOUNDS) == HAS_BOUNDS) { 1203 return mFocused.dispatchKeyShortcutEvent(event); 1204 } 1205 return false; 1206 } 1207 1208 /** 1209 * {@inheritDoc} 1210 */ 1211 @Override 1212 public boolean dispatchTrackballEvent(MotionEvent event) { 1213 if (mInputEventConsistencyVerifier != null) { 1214 mInputEventConsistencyVerifier.onTrackballEvent(event, 1); 1215 } 1216 1217 if ((mPrivateFlags & (FOCUSED | HAS_BOUNDS)) == (FOCUSED | HAS_BOUNDS)) { 1218 if (super.dispatchTrackballEvent(event)) { 1219 return true; 1220 } 1221 } else if (mFocused != null && (mFocused.mPrivateFlags & HAS_BOUNDS) == HAS_BOUNDS) { 1222 if (mFocused.dispatchTrackballEvent(event)) { 1223 return true; 1224 } 1225 } 1226 1227 if (mInputEventConsistencyVerifier != null) { 1228 mInputEventConsistencyVerifier.onUnhandledEvent(event, 1); 1229 } 1230 return false; 1231 } 1232 1233 /** 1234 * {@inheritDoc} 1235 */ 1236 @SuppressWarnings({"ConstantConditions"}) 1237 @Override 1238 protected boolean dispatchHoverEvent(MotionEvent event) { 1239 final int action = event.getAction(); 1240 1241 // First check whether the view group wants to intercept the hover event. 1242 final boolean interceptHover = onInterceptHoverEvent(event); 1243 event.setAction(action); // restore action in case it was changed 1244 1245 MotionEvent eventNoHistory = event; 1246 boolean handled = false; 1247 1248 // Send events to the hovered children and build a new list of hover targets until 1249 // one is found that handles the event. 1250 HoverTarget firstOldHoverTarget = mFirstHoverTarget; 1251 mFirstHoverTarget = null; 1252 if (!interceptHover && action != MotionEvent.ACTION_HOVER_EXIT) { 1253 final float x = event.getX(); 1254 final float y = event.getY(); 1255 final int childrenCount = mChildrenCount; 1256 if (childrenCount != 0) { 1257 final View[] children = mChildren; 1258 HoverTarget lastHoverTarget = null; 1259 for (int i = childrenCount - 1; i >= 0; i--) { 1260 final View child = children[i]; 1261 if (!canViewReceivePointerEvents(child) 1262 || !isTransformedTouchPointInView(x, y, child, null)) { 1263 continue; 1264 } 1265 1266 // Obtain a hover target for this child. Dequeue it from the 1267 // old hover target list if the child was previously hovered. 1268 HoverTarget hoverTarget = firstOldHoverTarget; 1269 final boolean wasHovered; 1270 for (HoverTarget predecessor = null; ;) { 1271 if (hoverTarget == null) { 1272 hoverTarget = HoverTarget.obtain(child); 1273 wasHovered = false; 1274 break; 1275 } 1276 1277 if (hoverTarget.child == child) { 1278 if (predecessor != null) { 1279 predecessor.next = hoverTarget.next; 1280 } else { 1281 firstOldHoverTarget = hoverTarget.next; 1282 } 1283 hoverTarget.next = null; 1284 wasHovered = true; 1285 break; 1286 } 1287 1288 predecessor = hoverTarget; 1289 hoverTarget = hoverTarget.next; 1290 } 1291 1292 // Enqueue the hover target onto the new hover target list. 1293 if (lastHoverTarget != null) { 1294 lastHoverTarget.next = hoverTarget; 1295 } else { 1296 lastHoverTarget = hoverTarget; 1297 mFirstHoverTarget = hoverTarget; 1298 } 1299 1300 // Dispatch the event to the child. 1301 if (action == MotionEvent.ACTION_HOVER_ENTER) { 1302 if (!wasHovered) { 1303 // Send the enter as is. 1304 handled |= dispatchTransformedGenericPointerEvent( 1305 event, child); // enter 1306 } 1307 } else if (action == MotionEvent.ACTION_HOVER_MOVE) { 1308 if (!wasHovered) { 1309 // Synthesize an enter from a move. 1310 eventNoHistory = obtainMotionEventNoHistoryOrSelf(eventNoHistory); 1311 eventNoHistory.setAction(MotionEvent.ACTION_HOVER_ENTER); 1312 handled |= dispatchTransformedGenericPointerEvent( 1313 eventNoHistory, child); // enter 1314 eventNoHistory.setAction(action); 1315 1316 handled |= dispatchTransformedGenericPointerEvent( 1317 eventNoHistory, child); // move 1318 } else { 1319 // Send the move as is. 1320 handled |= dispatchTransformedGenericPointerEvent(event, child); 1321 } 1322 } 1323 if (handled) { 1324 break; 1325 } 1326 } 1327 } 1328 } 1329 1330 // Send exit events to all previously hovered children that are no longer hovered. 1331 while (firstOldHoverTarget != null) { 1332 final View child = firstOldHoverTarget.child; 1333 1334 // Exit the old hovered child. 1335 if (action == MotionEvent.ACTION_HOVER_EXIT) { 1336 // Send the exit as is. 1337 handled |= dispatchTransformedGenericPointerEvent( 1338 event, child); // exit 1339 } else { 1340 // Synthesize an exit from a move or enter. 1341 // Ignore the result because hover focus has moved to a different view. 1342 if (action == MotionEvent.ACTION_HOVER_MOVE) { 1343 dispatchTransformedGenericPointerEvent( 1344 event, child); // move 1345 } 1346 eventNoHistory = obtainMotionEventNoHistoryOrSelf(eventNoHistory); 1347 eventNoHistory.setAction(MotionEvent.ACTION_HOVER_EXIT); 1348 dispatchTransformedGenericPointerEvent( 1349 eventNoHistory, child); // exit 1350 eventNoHistory.setAction(action); 1351 } 1352 1353 final HoverTarget nextOldHoverTarget = firstOldHoverTarget.next; 1354 firstOldHoverTarget.recycle(); 1355 firstOldHoverTarget = nextOldHoverTarget; 1356 } 1357 1358 // Send events to the view group itself if no children have handled it. 1359 boolean newHoveredSelf = !handled; 1360 if (newHoveredSelf == mHoveredSelf) { 1361 if (newHoveredSelf) { 1362 // Send event to the view group as before. 1363 handled |= super.dispatchHoverEvent(event); 1364 } 1365 } else { 1366 if (mHoveredSelf) { 1367 // Exit the view group. 1368 if (action == MotionEvent.ACTION_HOVER_EXIT) { 1369 // Send the exit as is. 1370 handled |= super.dispatchHoverEvent(event); // exit 1371 } else { 1372 // Synthesize an exit from a move or enter. 1373 // Ignore the result because hover focus is moving to a different view. 1374 if (action == MotionEvent.ACTION_HOVER_MOVE) { 1375 super.dispatchHoverEvent(event); // move 1376 } 1377 eventNoHistory = obtainMotionEventNoHistoryOrSelf(eventNoHistory); 1378 eventNoHistory.setAction(MotionEvent.ACTION_HOVER_EXIT); 1379 super.dispatchHoverEvent(eventNoHistory); // exit 1380 eventNoHistory.setAction(action); 1381 } 1382 mHoveredSelf = false; 1383 } 1384 1385 if (newHoveredSelf) { 1386 // Enter the view group. 1387 if (action == MotionEvent.ACTION_HOVER_ENTER) { 1388 // Send the enter as is. 1389 handled |= super.dispatchHoverEvent(event); // enter 1390 mHoveredSelf = true; 1391 } else if (action == MotionEvent.ACTION_HOVER_MOVE) { 1392 // Synthesize an enter from a move. 1393 eventNoHistory = obtainMotionEventNoHistoryOrSelf(eventNoHistory); 1394 eventNoHistory.setAction(MotionEvent.ACTION_HOVER_ENTER); 1395 handled |= super.dispatchHoverEvent(eventNoHistory); // enter 1396 eventNoHistory.setAction(action); 1397 1398 handled |= super.dispatchHoverEvent(eventNoHistory); // move 1399 mHoveredSelf = true; 1400 } 1401 } 1402 } 1403 1404 // Recycle the copy of the event that we made. 1405 if (eventNoHistory != event) { 1406 eventNoHistory.recycle(); 1407 } 1408 1409 // Done. 1410 return handled; 1411 } 1412 1413 /** @hide */ 1414 @Override 1415 protected boolean hasHoveredChild() { 1416 return mFirstHoverTarget != null; 1417 } 1418 1419 /** 1420 * Implement this method to intercept hover events before they are handled 1421 * by child views. 1422 * <p> 1423 * This method is called before dispatching a hover event to a child of 1424 * the view group or to the view group's own {@link #onHoverEvent} to allow 1425 * the view group a chance to intercept the hover event. 1426 * This method can also be used to watch all pointer motions that occur within 1427 * the bounds of the view group even when the pointer is hovering over 1428 * a child of the view group rather than over the view group itself. 1429 * </p><p> 1430 * The view group can prevent its children from receiving hover events by 1431 * implementing this method and returning <code>true</code> to indicate 1432 * that it would like to intercept hover events. The view group must 1433 * continuously return <code>true</code> from {@link #onInterceptHoverEvent} 1434 * for as long as it wishes to continue intercepting hover events from 1435 * its children. 1436 * </p><p> 1437 * Interception preserves the invariant that at most one view can be 1438 * hovered at a time by transferring hover focus from the currently hovered 1439 * child to the view group or vice-versa as needed. 1440 * </p><p> 1441 * If this method returns <code>true</code> and a child is already hovered, then the 1442 * child view will first receive a hover exit event and then the view group 1443 * itself will receive a hover enter event in {@link #onHoverEvent}. 1444 * Likewise, if this method had previously returned <code>true</code> to intercept hover 1445 * events and instead returns <code>false</code> while the pointer is hovering 1446 * within the bounds of one of a child, then the view group will first receive a 1447 * hover exit event in {@link #onHoverEvent} and then the hovered child will 1448 * receive a hover enter event. 1449 * </p><p> 1450 * The default implementation always returns false. 1451 * </p> 1452 * 1453 * @param event The motion event that describes the hover. 1454 * @return True if the view group would like to intercept the hover event 1455 * and prevent its children from receiving it. 1456 */ 1457 public boolean onInterceptHoverEvent(MotionEvent event) { 1458 return false; 1459 } 1460 1461 private static MotionEvent obtainMotionEventNoHistoryOrSelf(MotionEvent event) { 1462 if (event.getHistorySize() == 0) { 1463 return event; 1464 } 1465 return MotionEvent.obtainNoHistory(event); 1466 } 1467 1468 /** 1469 * {@inheritDoc} 1470 */ 1471 @Override 1472 protected boolean dispatchGenericPointerEvent(MotionEvent event) { 1473 // Send the event to the child under the pointer. 1474 final int childrenCount = mChildrenCount; 1475 if (childrenCount != 0) { 1476 final View[] children = mChildren; 1477 final float x = event.getX(); 1478 final float y = event.getY(); 1479 1480 for (int i = childrenCount - 1; i >= 0; i--) { 1481 final View child = children[i]; 1482 if (!canViewReceivePointerEvents(child) 1483 || !isTransformedTouchPointInView(x, y, child, null)) { 1484 continue; 1485 } 1486 1487 if (dispatchTransformedGenericPointerEvent(event, child)) { 1488 return true; 1489 } 1490 } 1491 } 1492 1493 // No child handled the event. Send it to this view group. 1494 return super.dispatchGenericPointerEvent(event); 1495 } 1496 1497 /** 1498 * {@inheritDoc} 1499 */ 1500 @Override 1501 protected boolean dispatchGenericFocusedEvent(MotionEvent event) { 1502 // Send the event to the focused child or to this view group if it has focus. 1503 if ((mPrivateFlags & (FOCUSED | HAS_BOUNDS)) == (FOCUSED | HAS_BOUNDS)) { 1504 return super.dispatchGenericFocusedEvent(event); 1505 } else if (mFocused != null && (mFocused.mPrivateFlags & HAS_BOUNDS) == HAS_BOUNDS) { 1506 return mFocused.dispatchGenericMotionEvent(event); 1507 } 1508 return false; 1509 } 1510 1511 /** 1512 * Dispatches a generic pointer event to a child, taking into account 1513 * transformations that apply to the child. 1514 * 1515 * @param event The event to send. 1516 * @param child The view to send the event to. 1517 * @return {@code true} if the child handled the event. 1518 */ 1519 private boolean dispatchTransformedGenericPointerEvent(MotionEvent event, View child) { 1520 final float offsetX = mScrollX - child.mLeft; 1521 final float offsetY = mScrollY - child.mTop; 1522 1523 boolean handled; 1524 if (!child.hasIdentityMatrix()) { 1525 MotionEvent transformedEvent = MotionEvent.obtain(event); 1526 transformedEvent.offsetLocation(offsetX, offsetY); 1527 transformedEvent.transform(child.getInverseMatrix()); 1528 handled = child.dispatchGenericMotionEvent(transformedEvent); 1529 transformedEvent.recycle(); 1530 } else { 1531 event.offsetLocation(offsetX, offsetY); 1532 handled = child.dispatchGenericMotionEvent(event); 1533 event.offsetLocation(-offsetX, -offsetY); 1534 } 1535 return handled; 1536 } 1537 1538 /** 1539 * {@inheritDoc} 1540 */ 1541 @Override 1542 public boolean dispatchTouchEvent(MotionEvent ev) { 1543 if (mInputEventConsistencyVerifier != null) { 1544 mInputEventConsistencyVerifier.onTouchEvent(ev, 1); 1545 } 1546 1547 boolean handled = false; 1548 if (onFilterTouchEventForSecurity(ev)) { 1549 final int action = ev.getAction(); 1550 final int actionMasked = action & MotionEvent.ACTION_MASK; 1551 1552 // Handle an initial down. 1553 if (actionMasked == MotionEvent.ACTION_DOWN) { 1554 // Throw away all previous state when starting a new touch gesture. 1555 // The framework may have dropped the up or cancel event for the previous gesture 1556 // due to an app switch, ANR, or some other state change. 1557 cancelAndClearTouchTargets(ev); 1558 resetTouchState(); 1559 } 1560 1561 // Check for interception. 1562 final boolean intercepted; 1563 if (actionMasked == MotionEvent.ACTION_DOWN 1564 || mFirstTouchTarget != null) { 1565 final boolean disallowIntercept = (mGroupFlags & FLAG_DISALLOW_INTERCEPT) != 0; 1566 if (!disallowIntercept) { 1567 intercepted = onInterceptTouchEvent(ev); 1568 ev.setAction(action); // restore action in case it was changed 1569 } else { 1570 intercepted = false; 1571 } 1572 } else { 1573 // There are no touch targets and this action is not an initial down 1574 // so this view group continues to intercept touches. 1575 intercepted = true; 1576 } 1577 1578 // Check for cancelation. 1579 final boolean canceled = resetCancelNextUpFlag(this) 1580 || actionMasked == MotionEvent.ACTION_CANCEL; 1581 1582 // Update list of touch targets for pointer down, if needed. 1583 final boolean split = (mGroupFlags & FLAG_SPLIT_MOTION_EVENTS) != 0; 1584 TouchTarget newTouchTarget = null; 1585 boolean alreadyDispatchedToNewTouchTarget = false; 1586 if (!canceled && !intercepted) { 1587 if (actionMasked == MotionEvent.ACTION_DOWN 1588 || (split && actionMasked == MotionEvent.ACTION_POINTER_DOWN) 1589 || actionMasked == MotionEvent.ACTION_HOVER_MOVE) { 1590 final int actionIndex = ev.getActionIndex(); // always 0 for down 1591 final int idBitsToAssign = split ? 1 << ev.getPointerId(actionIndex) 1592 : TouchTarget.ALL_POINTER_IDS; 1593 1594 // Clean up earlier touch targets for this pointer id in case they 1595 // have become out of sync. 1596 removePointersFromTouchTargets(idBitsToAssign); 1597 1598 final int childrenCount = mChildrenCount; 1599 if (childrenCount != 0) { 1600 // Find a child that can receive the event. 1601 // Scan children from front to back. 1602 final View[] children = mChildren; 1603 final float x = ev.getX(actionIndex); 1604 final float y = ev.getY(actionIndex); 1605 1606 for (int i = childrenCount - 1; i >= 0; i--) { 1607 final View child = children[i]; 1608 if (!canViewReceivePointerEvents(child) 1609 || !isTransformedTouchPointInView(x, y, child, null)) { 1610 continue; 1611 } 1612 1613 newTouchTarget = getTouchTarget(child); 1614 if (newTouchTarget != null) { 1615 // Child is already receiving touch within its bounds. 1616 // Give it the new pointer in addition to the ones it is handling. 1617 newTouchTarget.pointerIdBits |= idBitsToAssign; 1618 break; 1619 } 1620 1621 resetCancelNextUpFlag(child); 1622 if (dispatchTransformedTouchEvent(ev, false, child, idBitsToAssign)) { 1623 // Child wants to receive touch within its bounds. 1624 mLastTouchDownTime = ev.getDownTime(); 1625 mLastTouchDownIndex = i; 1626 mLastTouchDownX = ev.getX(); 1627 mLastTouchDownY = ev.getY(); 1628 newTouchTarget = addTouchTarget(child, idBitsToAssign); 1629 alreadyDispatchedToNewTouchTarget = true; 1630 break; 1631 } 1632 } 1633 } 1634 1635 if (newTouchTarget == null && mFirstTouchTarget != null) { 1636 // Did not find a child to receive the event. 1637 // Assign the pointer to the least recently added target. 1638 newTouchTarget = mFirstTouchTarget; 1639 while (newTouchTarget.next != null) { 1640 newTouchTarget = newTouchTarget.next; 1641 } 1642 newTouchTarget.pointerIdBits |= idBitsToAssign; 1643 } 1644 } 1645 } 1646 1647 // Dispatch to touch targets. 1648 if (mFirstTouchTarget == null) { 1649 // No touch targets so treat this as an ordinary view. 1650 handled = dispatchTransformedTouchEvent(ev, canceled, null, 1651 TouchTarget.ALL_POINTER_IDS); 1652 } else { 1653 // Dispatch to touch targets, excluding the new touch target if we already 1654 // dispatched to it. Cancel touch targets if necessary. 1655 TouchTarget predecessor = null; 1656 TouchTarget target = mFirstTouchTarget; 1657 while (target != null) { 1658 final TouchTarget next = target.next; 1659 if (alreadyDispatchedToNewTouchTarget && target == newTouchTarget) { 1660 handled = true; 1661 } else { 1662 final boolean cancelChild = resetCancelNextUpFlag(target.child) 1663 || intercepted; 1664 if (dispatchTransformedTouchEvent(ev, cancelChild, 1665 target.child, target.pointerIdBits)) { 1666 handled = true; 1667 } 1668 if (cancelChild) { 1669 if (predecessor == null) { 1670 mFirstTouchTarget = next; 1671 } else { 1672 predecessor.next = next; 1673 } 1674 target.recycle(); 1675 target = next; 1676 continue; 1677 } 1678 } 1679 predecessor = target; 1680 target = next; 1681 } 1682 } 1683 1684 // Update list of touch targets for pointer up or cancel, if needed. 1685 if (canceled 1686 || actionMasked == MotionEvent.ACTION_UP 1687 || actionMasked == MotionEvent.ACTION_HOVER_MOVE) { 1688 resetTouchState(); 1689 } else if (split && actionMasked == MotionEvent.ACTION_POINTER_UP) { 1690 final int actionIndex = ev.getActionIndex(); 1691 final int idBitsToRemove = 1 << ev.getPointerId(actionIndex); 1692 removePointersFromTouchTargets(idBitsToRemove); 1693 } 1694 } 1695 1696 if (!handled && mInputEventConsistencyVerifier != null) { 1697 mInputEventConsistencyVerifier.onUnhandledEvent(ev, 1); 1698 } 1699 return handled; 1700 } 1701 1702 /** 1703 * Resets all touch state in preparation for a new cycle. 1704 */ 1705 private void resetTouchState() { 1706 clearTouchTargets(); 1707 resetCancelNextUpFlag(this); 1708 mGroupFlags &= ~FLAG_DISALLOW_INTERCEPT; 1709 } 1710 1711 /** 1712 * Resets the cancel next up flag. 1713 * Returns true if the flag was previously set. 1714 */ 1715 private boolean resetCancelNextUpFlag(View view) { 1716 if ((view.mPrivateFlags & CANCEL_NEXT_UP_EVENT) != 0) { 1717 view.mPrivateFlags &= ~CANCEL_NEXT_UP_EVENT; 1718 return true; 1719 } 1720 return false; 1721 } 1722 1723 /** 1724 * Clears all touch targets. 1725 */ 1726 private void clearTouchTargets() { 1727 TouchTarget target = mFirstTouchTarget; 1728 if (target != null) { 1729 do { 1730 TouchTarget next = target.next; 1731 target.recycle(); 1732 target = next; 1733 } while (target != null); 1734 mFirstTouchTarget = null; 1735 } 1736 } 1737 1738 /** 1739 * Cancels and clears all touch targets. 1740 */ 1741 private void cancelAndClearTouchTargets(MotionEvent event) { 1742 if (mFirstTouchTarget != null) { 1743 boolean syntheticEvent = false; 1744 if (event == null) { 1745 final long now = SystemClock.uptimeMillis(); 1746 event = MotionEvent.obtain(now, now, 1747 MotionEvent.ACTION_CANCEL, 0.0f, 0.0f, 0); 1748 syntheticEvent = true; 1749 } 1750 1751 for (TouchTarget target = mFirstTouchTarget; target != null; target = target.next) { 1752 resetCancelNextUpFlag(target.child); 1753 dispatchTransformedTouchEvent(event, true, target.child, target.pointerIdBits); 1754 } 1755 clearTouchTargets(); 1756 1757 if (syntheticEvent) { 1758 event.recycle(); 1759 } 1760 } 1761 } 1762 1763 /** 1764 * Gets the touch target for specified child view. 1765 * Returns null if not found. 1766 */ 1767 private TouchTarget getTouchTarget(View child) { 1768 for (TouchTarget target = mFirstTouchTarget; target != null; target = target.next) { 1769 if (target.child == child) { 1770 return target; 1771 } 1772 } 1773 return null; 1774 } 1775 1776 /** 1777 * Adds a touch target for specified child to the beginning of the list. 1778 * Assumes the target child is not already present. 1779 */ 1780 private TouchTarget addTouchTarget(View child, int pointerIdBits) { 1781 TouchTarget target = TouchTarget.obtain(child, pointerIdBits); 1782 target.next = mFirstTouchTarget; 1783 mFirstTouchTarget = target; 1784 return target; 1785 } 1786 1787 /** 1788 * Removes the pointer ids from consideration. 1789 */ 1790 private void removePointersFromTouchTargets(int pointerIdBits) { 1791 TouchTarget predecessor = null; 1792 TouchTarget target = mFirstTouchTarget; 1793 while (target != null) { 1794 final TouchTarget next = target.next; 1795 if ((target.pointerIdBits & pointerIdBits) != 0) { 1796 target.pointerIdBits &= ~pointerIdBits; 1797 if (target.pointerIdBits == 0) { 1798 if (predecessor == null) { 1799 mFirstTouchTarget = next; 1800 } else { 1801 predecessor.next = next; 1802 } 1803 target.recycle(); 1804 target = next; 1805 continue; 1806 } 1807 } 1808 predecessor = target; 1809 target = next; 1810 } 1811 } 1812 1813 /** 1814 * Returns true if a child view can receive pointer events. 1815 * @hide 1816 */ 1817 private static boolean canViewReceivePointerEvents(View child) { 1818 return (child.mViewFlags & VISIBILITY_MASK) == VISIBLE 1819 || child.getAnimation() != null; 1820 } 1821 1822 /** 1823 * Returns true if a child view contains the specified point when transformed 1824 * into its coordinate space. 1825 * Child must not be null. 1826 * @hide 1827 */ 1828 protected boolean isTransformedTouchPointInView(float x, float y, View child, 1829 PointF outLocalPoint) { 1830 float localX = x + mScrollX - child.mLeft; 1831 float localY = y + mScrollY - child.mTop; 1832 if (! child.hasIdentityMatrix() && mAttachInfo != null) { 1833 final float[] localXY = mAttachInfo.mTmpTransformLocation; 1834 localXY[0] = localX; 1835 localXY[1] = localY; 1836 child.getInverseMatrix().mapPoints(localXY); 1837 localX = localXY[0]; 1838 localY = localXY[1]; 1839 } 1840 final boolean isInView = child.pointInView(localX, localY); 1841 if (isInView && outLocalPoint != null) { 1842 outLocalPoint.set(localX, localY); 1843 } 1844 return isInView; 1845 } 1846 1847 /** 1848 * Transforms a motion event into the coordinate space of a particular child view, 1849 * filters out irrelevant pointer ids, and overrides its action if necessary. 1850 * If child is null, assumes the MotionEvent will be sent to this ViewGroup instead. 1851 */ 1852 private boolean dispatchTransformedTouchEvent(MotionEvent event, boolean cancel, 1853 View child, int desiredPointerIdBits) { 1854 final boolean handled; 1855 1856 // Canceling motions is a special case. We don't need to perform any transformations 1857 // or filtering. The important part is the action, not the contents. 1858 final int oldAction = event.getAction(); 1859 if (cancel || oldAction == MotionEvent.ACTION_CANCEL) { 1860 event.setAction(MotionEvent.ACTION_CANCEL); 1861 if (child == null) { 1862 handled = super.dispatchTouchEvent(event); 1863 } else { 1864 handled = child.dispatchTouchEvent(event); 1865 } 1866 event.setAction(oldAction); 1867 return handled; 1868 } 1869 1870 // Calculate the number of pointers to deliver. 1871 final int oldPointerIdBits = event.getPointerIdBits(); 1872 final int newPointerIdBits = oldPointerIdBits & desiredPointerIdBits; 1873 1874 // If for some reason we ended up in an inconsistent state where it looks like we 1875 // might produce a motion event with no pointers in it, then drop the event. 1876 if (newPointerIdBits == 0) { 1877 return false; 1878 } 1879 1880 // If the number of pointers is the same and we don't need to perform any fancy 1881 // irreversible transformations, then we can reuse the motion event for this 1882 // dispatch as long as we are careful to revert any changes we make. 1883 // Otherwise we need to make a copy. 1884 final MotionEvent transformedEvent; 1885 if (newPointerIdBits == oldPointerIdBits) { 1886 if (child == null || child.hasIdentityMatrix()) { 1887 if (child == null) { 1888 handled = super.dispatchTouchEvent(event); 1889 } else { 1890 final float offsetX = mScrollX - child.mLeft; 1891 final float offsetY = mScrollY - child.mTop; 1892 event.offsetLocation(offsetX, offsetY); 1893 1894 handled = child.dispatchTouchEvent(event); 1895 1896 event.offsetLocation(-offsetX, -offsetY); 1897 } 1898 return handled; 1899 } 1900 transformedEvent = MotionEvent.obtain(event); 1901 } else { 1902 transformedEvent = event.split(newPointerIdBits); 1903 } 1904 1905 // Perform any necessary transformations and dispatch. 1906 if (child == null) { 1907 handled = super.dispatchTouchEvent(transformedEvent); 1908 } else { 1909 final float offsetX = mScrollX - child.mLeft; 1910 final float offsetY = mScrollY - child.mTop; 1911 transformedEvent.offsetLocation(offsetX, offsetY); 1912 if (! child.hasIdentityMatrix()) { 1913 transformedEvent.transform(child.getInverseMatrix()); 1914 } 1915 1916 handled = child.dispatchTouchEvent(transformedEvent); 1917 } 1918 1919 // Done. 1920 transformedEvent.recycle(); 1921 return handled; 1922 } 1923 1924 /** 1925 * Enable or disable the splitting of MotionEvents to multiple children during touch event 1926 * dispatch. This behavior is enabled by default for applications that target an 1927 * SDK version of {@link Build.VERSION_CODES#HONEYCOMB} or newer. 1928 * 1929 * <p>When this option is enabled MotionEvents may be split and dispatched to different child 1930 * views depending on where each pointer initially went down. This allows for user interactions 1931 * such as scrolling two panes of content independently, chording of buttons, and performing 1932 * independent gestures on different pieces of content. 1933 * 1934 * @param split <code>true</code> to allow MotionEvents to be split and dispatched to multiple 1935 * child views. <code>false</code> to only allow one child view to be the target of 1936 * any MotionEvent received by this ViewGroup. 1937 */ 1938 public void setMotionEventSplittingEnabled(boolean split) { 1939 // TODO Applications really shouldn't change this setting mid-touch event, 1940 // but perhaps this should handle that case and send ACTION_CANCELs to any child views 1941 // with gestures in progress when this is changed. 1942 if (split) { 1943 mGroupFlags |= FLAG_SPLIT_MOTION_EVENTS; 1944 } else { 1945 mGroupFlags &= ~FLAG_SPLIT_MOTION_EVENTS; 1946 } 1947 } 1948 1949 /** 1950 * Returns true if MotionEvents dispatched to this ViewGroup can be split to multiple children. 1951 * @return true if MotionEvents dispatched to this ViewGroup can be split to multiple children. 1952 */ 1953 public boolean isMotionEventSplittingEnabled() { 1954 return (mGroupFlags & FLAG_SPLIT_MOTION_EVENTS) == FLAG_SPLIT_MOTION_EVENTS; 1955 } 1956 1957 /** 1958 * {@inheritDoc} 1959 */ 1960 public void requestDisallowInterceptTouchEvent(boolean disallowIntercept) { 1961 1962 if (disallowIntercept == ((mGroupFlags & FLAG_DISALLOW_INTERCEPT) != 0)) { 1963 // We're already in this state, assume our ancestors are too 1964 return; 1965 } 1966 1967 if (disallowIntercept) { 1968 mGroupFlags |= FLAG_DISALLOW_INTERCEPT; 1969 } else { 1970 mGroupFlags &= ~FLAG_DISALLOW_INTERCEPT; 1971 } 1972 1973 // Pass it up to our parent 1974 if (mParent != null) { 1975 mParent.requestDisallowInterceptTouchEvent(disallowIntercept); 1976 } 1977 } 1978 1979 /** 1980 * Implement this method to intercept all touch screen motion events. This 1981 * allows you to watch events as they are dispatched to your children, and 1982 * take ownership of the current gesture at any point. 1983 * 1984 * <p>Using this function takes some care, as it has a fairly complicated 1985 * interaction with {@link View#onTouchEvent(MotionEvent) 1986 * View.onTouchEvent(MotionEvent)}, and using it requires implementing 1987 * that method as well as this one in the correct way. Events will be 1988 * received in the following order: 1989 * 1990 * <ol> 1991 * <li> You will receive the down event here. 1992 * <li> The down event will be handled either by a child of this view 1993 * group, or given to your own onTouchEvent() method to handle; this means 1994 * you should implement onTouchEvent() to return true, so you will 1995 * continue to see the rest of the gesture (instead of looking for 1996 * a parent view to handle it). Also, by returning true from 1997 * onTouchEvent(), you will not receive any following 1998 * events in onInterceptTouchEvent() and all touch processing must 1999 * happen in onTouchEvent() like normal. 2000 * <li> For as long as you return false from this function, each following 2001 * event (up to and including the final up) will be delivered first here 2002 * and then to the target's onTouchEvent(). 2003 * <li> If you return true from here, you will not receive any 2004 * following events: the target view will receive the same event but 2005 * with the action {@link MotionEvent#ACTION_CANCEL}, and all further 2006 * events will be delivered to your onTouchEvent() method and no longer 2007 * appear here. 2008 * </ol> 2009 * 2010 * @param ev The motion event being dispatched down the hierarchy. 2011 * @return Return true to steal motion events from the children and have 2012 * them dispatched to this ViewGroup through onTouchEvent(). 2013 * The current target will receive an ACTION_CANCEL event, and no further 2014 * messages will be delivered here. 2015 */ 2016 public boolean onInterceptTouchEvent(MotionEvent ev) { 2017 return false; 2018 } 2019 2020 /** 2021 * {@inheritDoc} 2022 * 2023 * Looks for a view to give focus to respecting the setting specified by 2024 * {@link #getDescendantFocusability()}. 2025 * 2026 * Uses {@link #onRequestFocusInDescendants(int, android.graphics.Rect)} to 2027 * find focus within the children of this group when appropriate. 2028 * 2029 * @see #FOCUS_BEFORE_DESCENDANTS 2030 * @see #FOCUS_AFTER_DESCENDANTS 2031 * @see #FOCUS_BLOCK_DESCENDANTS 2032 * @see #onRequestFocusInDescendants(int, android.graphics.Rect) 2033 */ 2034 @Override 2035 public boolean requestFocus(int direction, Rect previouslyFocusedRect) { 2036 if (DBG) { 2037 System.out.println(this + " ViewGroup.requestFocus direction=" 2038 + direction); 2039 } 2040 int descendantFocusability = getDescendantFocusability(); 2041 2042 switch (descendantFocusability) { 2043 case FOCUS_BLOCK_DESCENDANTS: 2044 return super.requestFocus(direction, previouslyFocusedRect); 2045 case FOCUS_BEFORE_DESCENDANTS: { 2046 final boolean took = super.requestFocus(direction, previouslyFocusedRect); 2047 return took ? took : onRequestFocusInDescendants(direction, previouslyFocusedRect); 2048 } 2049 case FOCUS_AFTER_DESCENDANTS: { 2050 final boolean took = onRequestFocusInDescendants(direction, previouslyFocusedRect); 2051 return took ? took : super.requestFocus(direction, previouslyFocusedRect); 2052 } 2053 default: 2054 throw new IllegalStateException("descendant focusability must be " 2055 + "one of FOCUS_BEFORE_DESCENDANTS, FOCUS_AFTER_DESCENDANTS, FOCUS_BLOCK_DESCENDANTS " 2056 + "but is " + descendantFocusability); 2057 } 2058 } 2059 2060 /** 2061 * Look for a descendant to call {@link View#requestFocus} on. 2062 * Called by {@link ViewGroup#requestFocus(int, android.graphics.Rect)} 2063 * when it wants to request focus within its children. Override this to 2064 * customize how your {@link ViewGroup} requests focus within its children. 2065 * @param direction One of FOCUS_UP, FOCUS_DOWN, FOCUS_LEFT, and FOCUS_RIGHT 2066 * @param previouslyFocusedRect The rectangle (in this View's coordinate system) 2067 * to give a finer grained hint about where focus is coming from. May be null 2068 * if there is no hint. 2069 * @return Whether focus was taken. 2070 */ 2071 @SuppressWarnings({"ConstantConditions"}) 2072 protected boolean onRequestFocusInDescendants(int direction, 2073 Rect previouslyFocusedRect) { 2074 int index; 2075 int increment; 2076 int end; 2077 int count = mChildrenCount; 2078 if ((direction & FOCUS_FORWARD) != 0) { 2079 index = 0; 2080 increment = 1; 2081 end = count; 2082 } else { 2083 index = count - 1; 2084 increment = -1; 2085 end = -1; 2086 } 2087 final View[] children = mChildren; 2088 for (int i = index; i != end; i += increment) { 2089 View child = children[i]; 2090 if ((child.mViewFlags & VISIBILITY_MASK) == VISIBLE) { 2091 if (child.requestFocus(direction, previouslyFocusedRect)) { 2092 return true; 2093 } 2094 } 2095 } 2096 return false; 2097 } 2098 2099 /** 2100 * {@inheritDoc} 2101 * 2102 * @hide 2103 */ 2104 @Override 2105 public void dispatchStartTemporaryDetach() { 2106 super.dispatchStartTemporaryDetach(); 2107 final int count = mChildrenCount; 2108 final View[] children = mChildren; 2109 for (int i = 0; i < count; i++) { 2110 children[i].dispatchStartTemporaryDetach(); 2111 } 2112 } 2113 2114 /** 2115 * {@inheritDoc} 2116 * 2117 * @hide 2118 */ 2119 @Override 2120 public void dispatchFinishTemporaryDetach() { 2121 super.dispatchFinishTemporaryDetach(); 2122 final int count = mChildrenCount; 2123 final View[] children = mChildren; 2124 for (int i = 0; i < count; i++) { 2125 children[i].dispatchFinishTemporaryDetach(); 2126 } 2127 } 2128 2129 /** 2130 * {@inheritDoc} 2131 */ 2132 @Override 2133 void dispatchAttachedToWindow(AttachInfo info, int visibility) { 2134 super.dispatchAttachedToWindow(info, visibility); 2135 visibility |= mViewFlags & VISIBILITY_MASK; 2136 final int count = mChildrenCount; 2137 final View[] children = mChildren; 2138 for (int i = 0; i < count; i++) { 2139 children[i].dispatchAttachedToWindow(info, visibility); 2140 } 2141 } 2142 2143 @Override 2144 public boolean dispatchPopulateAccessibilityEvent(AccessibilityEvent event) { 2145 // We first get a chance to populate the event. 2146 onPopulateAccessibilityEvent(event); 2147 // Let our children have a shot in populating the event. 2148 for (int i = 0, count = getChildCount(); i < count; i++) { 2149 boolean handled = getChildAt(i).dispatchPopulateAccessibilityEvent(event); 2150 if (handled) { 2151 return handled; 2152 } 2153 } 2154 return false; 2155 } 2156 2157 @Override 2158 public void onInitializeAccessibilityNodeInfo(AccessibilityNodeInfo info) { 2159 super.onInitializeAccessibilityNodeInfo(info); 2160 for (int i = 0, count = mChildrenCount; i < count; i++) { 2161 View child = mChildren[i]; 2162 if ((child.mViewFlags & VISIBILITY_MASK) == VISIBLE) { 2163 info.addChild(child); 2164 } 2165 } 2166 } 2167 2168 /** 2169 * {@inheritDoc} 2170 */ 2171 @Override 2172 void dispatchDetachedFromWindow() { 2173 // If we still have a touch target, we are still in the process of 2174 // dispatching motion events to a child; we need to get rid of that 2175 // child to avoid dispatching events to it after the window is torn 2176 // down. To make sure we keep the child in a consistent state, we 2177 // first send it an ACTION_CANCEL motion event. 2178 cancelAndClearTouchTargets(null); 2179 2180 // In case view is detached while transition is running 2181 mLayoutSuppressed = false; 2182 2183 // Tear down our drag tracking 2184 mDragNotifiedChildren = null; 2185 if (mCurrentDrag != null) { 2186 mCurrentDrag.recycle(); 2187 mCurrentDrag = null; 2188 } 2189 2190 final int count = mChildrenCount; 2191 final View[] children = mChildren; 2192 for (int i = 0; i < count; i++) { 2193 children[i].dispatchDetachedFromWindow(); 2194 } 2195 super.dispatchDetachedFromWindow(); 2196 } 2197 2198 /** 2199 * {@inheritDoc} 2200 */ 2201 @Override 2202 public void setPadding(int left, int top, int right, int bottom) { 2203 super.setPadding(left, top, right, bottom); 2204 2205 if ((mPaddingLeft | mPaddingTop | mPaddingRight | mPaddingBottom) != 0) { 2206 mGroupFlags |= FLAG_PADDING_NOT_NULL; 2207 } else { 2208 mGroupFlags &= ~FLAG_PADDING_NOT_NULL; 2209 } 2210 } 2211 2212 /** 2213 * {@inheritDoc} 2214 */ 2215 @Override 2216 protected void dispatchSaveInstanceState(SparseArray<Parcelable> container) { 2217 super.dispatchSaveInstanceState(container); 2218 final int count = mChildrenCount; 2219 final View[] children = mChildren; 2220 for (int i = 0; i < count; i++) { 2221 View c = children[i]; 2222 if ((c.mViewFlags & PARENT_SAVE_DISABLED_MASK) != PARENT_SAVE_DISABLED) { 2223 c.dispatchSaveInstanceState(container); 2224 } 2225 } 2226 } 2227 2228 /** 2229 * Perform dispatching of a {@link #saveHierarchyState(android.util.SparseArray)} freeze()} 2230 * to only this view, not to its children. For use when overriding 2231 * {@link #dispatchSaveInstanceState(android.util.SparseArray)} dispatchFreeze()} to allow 2232 * subclasses to freeze their own state but not the state of their children. 2233 * 2234 * @param container the container 2235 */ 2236 protected void dispatchFreezeSelfOnly(SparseArray<Parcelable> container) { 2237 super.dispatchSaveInstanceState(container); 2238 } 2239 2240 /** 2241 * {@inheritDoc} 2242 */ 2243 @Override 2244 protected void dispatchRestoreInstanceState(SparseArray<Parcelable> container) { 2245 super.dispatchRestoreInstanceState(container); 2246 final int count = mChildrenCount; 2247 final View[] children = mChildren; 2248 for (int i = 0; i < count; i++) { 2249 View c = children[i]; 2250 if ((c.mViewFlags & PARENT_SAVE_DISABLED_MASK) != PARENT_SAVE_DISABLED) { 2251 c.dispatchRestoreInstanceState(container); 2252 } 2253 } 2254 } 2255 2256 /** 2257 * Perform dispatching of a {@link #restoreHierarchyState(android.util.SparseArray)} 2258 * to only this view, not to its children. For use when overriding 2259 * {@link #dispatchRestoreInstanceState(android.util.SparseArray)} to allow 2260 * subclasses to thaw their own state but not the state of their children. 2261 * 2262 * @param container the container 2263 */ 2264 protected void dispatchThawSelfOnly(SparseArray<Parcelable> container) { 2265 super.dispatchRestoreInstanceState(container); 2266 } 2267 2268 /** 2269 * Enables or disables the drawing cache for each child of this view group. 2270 * 2271 * @param enabled true to enable the cache, false to dispose of it 2272 */ 2273 protected void setChildrenDrawingCacheEnabled(boolean enabled) { 2274 if (enabled || (mPersistentDrawingCache & PERSISTENT_ALL_CACHES) != PERSISTENT_ALL_CACHES) { 2275 final View[] children = mChildren; 2276 final int count = mChildrenCount; 2277 for (int i = 0; i < count; i++) { 2278 children[i].setDrawingCacheEnabled(enabled); 2279 } 2280 } 2281 } 2282 2283 @Override 2284 protected void onAnimationStart() { 2285 super.onAnimationStart(); 2286 2287 // When this ViewGroup's animation starts, build the cache for the children 2288 if ((mGroupFlags & FLAG_ANIMATION_CACHE) == FLAG_ANIMATION_CACHE) { 2289 final int count = mChildrenCount; 2290 final View[] children = mChildren; 2291 final boolean buildCache = !isHardwareAccelerated(); 2292 2293 for (int i = 0; i < count; i++) { 2294 final View child = children[i]; 2295 if ((child.mViewFlags & VISIBILITY_MASK) == VISIBLE) { 2296 child.setDrawingCacheEnabled(true); 2297 if (buildCache) { 2298 child.buildDrawingCache(true); 2299 } 2300 } 2301 } 2302 2303 mGroupFlags |= FLAG_CHILDREN_DRAWN_WITH_CACHE; 2304 } 2305 } 2306 2307 @Override 2308 protected void onAnimationEnd() { 2309 super.onAnimationEnd(); 2310 2311 // When this ViewGroup's animation ends, destroy the cache of the children 2312 if ((mGroupFlags & FLAG_ANIMATION_CACHE) == FLAG_ANIMATION_CACHE) { 2313 mGroupFlags &= ~FLAG_CHILDREN_DRAWN_WITH_CACHE; 2314 2315 if ((mPersistentDrawingCache & PERSISTENT_ANIMATION_CACHE) == 0) { 2316 setChildrenDrawingCacheEnabled(false); 2317 } 2318 } 2319 } 2320 2321 @Override 2322 Bitmap createSnapshot(Bitmap.Config quality, int backgroundColor, boolean skipChildren) { 2323 int count = mChildrenCount; 2324 int[] visibilities = null; 2325 2326 if (skipChildren) { 2327 visibilities = new int[count]; 2328 for (int i = 0; i < count; i++) { 2329 View child = getChildAt(i); 2330 visibilities[i] = child.getVisibility(); 2331 if (visibilities[i] == View.VISIBLE) { 2332 child.setVisibility(INVISIBLE); 2333 } 2334 } 2335 } 2336 2337 Bitmap b = super.createSnapshot(quality, backgroundColor, skipChildren); 2338 2339 if (skipChildren) { 2340 for (int i = 0; i < count; i++) { 2341 getChildAt(i).setVisibility(visibilities[i]); 2342 } 2343 } 2344 2345 return b; 2346 } 2347 2348 /** 2349 * {@inheritDoc} 2350 */ 2351 @Override 2352 protected void dispatchDraw(Canvas canvas) { 2353 final int count = mChildrenCount; 2354 final View[] children = mChildren; 2355 int flags = mGroupFlags; 2356 2357 if ((flags & FLAG_RUN_ANIMATION) != 0 && canAnimate()) { 2358 final boolean cache = (mGroupFlags & FLAG_ANIMATION_CACHE) == FLAG_ANIMATION_CACHE; 2359 2360 final boolean buildCache = !isHardwareAccelerated(); 2361 for (int i = 0; i < count; i++) { 2362 final View child = children[i]; 2363 if ((child.mViewFlags & VISIBILITY_MASK) == VISIBLE) { 2364 final LayoutParams params = child.getLayoutParams(); 2365 attachLayoutAnimationParameters(child, params, i, count); 2366 bindLayoutAnimation(child); 2367 if (cache) { 2368 child.setDrawingCacheEnabled(true); 2369 if (buildCache) { 2370 child.buildDrawingCache(true); 2371 } 2372 } 2373 } 2374 } 2375 2376 final LayoutAnimationController controller = mLayoutAnimationController; 2377 if (controller.willOverlap()) { 2378 mGroupFlags |= FLAG_OPTIMIZE_INVALIDATE; 2379 } 2380 2381 controller.start(); 2382 2383 mGroupFlags &= ~FLAG_RUN_ANIMATION; 2384 mGroupFlags &= ~FLAG_ANIMATION_DONE; 2385 2386 if (cache) { 2387 mGroupFlags |= FLAG_CHILDREN_DRAWN_WITH_CACHE; 2388 } 2389 2390 if (mAnimationListener != null) { 2391 mAnimationListener.onAnimationStart(controller.getAnimation()); 2392 } 2393 } 2394 2395 int saveCount = 0; 2396 final boolean clipToPadding = (flags & CLIP_TO_PADDING_MASK) == CLIP_TO_PADDING_MASK; 2397 if (clipToPadding) { 2398 saveCount = canvas.save(); 2399 canvas.clipRect(mScrollX + mPaddingLeft, mScrollY + mPaddingTop, 2400 mScrollX + mRight - mLeft - mPaddingRight, 2401 mScrollY + mBottom - mTop - mPaddingBottom); 2402 2403 } 2404 2405 // We will draw our child's animation, let's reset the flag 2406 mPrivateFlags &= ~DRAW_ANIMATION; 2407 mGroupFlags &= ~FLAG_INVALIDATE_REQUIRED; 2408 2409 boolean more = false; 2410 final long drawingTime = getDrawingTime(); 2411 2412 if ((flags & FLAG_USE_CHILD_DRAWING_ORDER) == 0) { 2413 for (int i = 0; i < count; i++) { 2414 final View child = children[i]; 2415 if ((child.mViewFlags & VISIBILITY_MASK) == VISIBLE || child.getAnimation() != null) { 2416 more |= drawChild(canvas, child, drawingTime); 2417 } 2418 } 2419 } else { 2420 for (int i = 0; i < count; i++) { 2421 final View child = children[getChildDrawingOrder(count, i)]; 2422 if ((child.mViewFlags & VISIBILITY_MASK) == VISIBLE || child.getAnimation() != null) { 2423 more |= drawChild(canvas, child, drawingTime); 2424 } 2425 } 2426 } 2427 2428 // Draw any disappearing views that have animations 2429 if (mDisappearingChildren != null) { 2430 final ArrayList<View> disappearingChildren = mDisappearingChildren; 2431 final int disappearingCount = disappearingChildren.size() - 1; 2432 // Go backwards -- we may delete as animations finish 2433 for (int i = disappearingCount; i >= 0; i--) { 2434 final View child = disappearingChildren.get(i); 2435 more |= drawChild(canvas, child, drawingTime); 2436 } 2437 } 2438 2439 if (clipToPadding) { 2440 canvas.restoreToCount(saveCount); 2441 } 2442 2443 // mGroupFlags might have been updated by drawChild() 2444 flags = mGroupFlags; 2445 2446 if ((flags & FLAG_INVALIDATE_REQUIRED) == FLAG_INVALIDATE_REQUIRED) { 2447 invalidate(true); 2448 } 2449 2450 if ((flags & FLAG_ANIMATION_DONE) == 0 && (flags & FLAG_NOTIFY_ANIMATION_LISTENER) == 0 && 2451 mLayoutAnimationController.isDone() && !more) { 2452 // We want to erase the drawing cache and notify the listener after the 2453 // next frame is drawn because one extra invalidate() is caused by 2454 // drawChild() after the animation is over 2455 mGroupFlags |= FLAG_NOTIFY_ANIMATION_LISTENER; 2456 final Runnable end = new Runnable() { 2457 public void run() { 2458 notifyAnimationListener(); 2459 } 2460 }; 2461 post(end); 2462 } 2463 } 2464 2465 /** 2466 * Returns the index of the child to draw for this iteration. Override this 2467 * if you want to change the drawing order of children. By default, it 2468 * returns i. 2469 * <p> 2470 * NOTE: In order for this method to be called, you must enable child ordering 2471 * first by calling {@link #setChildrenDrawingOrderEnabled(boolean)}. 2472 * 2473 * @param i The current iteration. 2474 * @return The index of the child to draw this iteration. 2475 * 2476 * @see #setChildrenDrawingOrderEnabled(boolean) 2477 * @see #isChildrenDrawingOrderEnabled() 2478 */ 2479 protected int getChildDrawingOrder(int childCount, int i) { 2480 return i; 2481 } 2482 2483 private void notifyAnimationListener() { 2484 mGroupFlags &= ~FLAG_NOTIFY_ANIMATION_LISTENER; 2485 mGroupFlags |= FLAG_ANIMATION_DONE; 2486 2487 if (mAnimationListener != null) { 2488 final Runnable end = new Runnable() { 2489 public void run() { 2490 mAnimationListener.onAnimationEnd(mLayoutAnimationController.getAnimation()); 2491 } 2492 }; 2493 post(end); 2494 } 2495 2496 if ((mGroupFlags & FLAG_ANIMATION_CACHE) == FLAG_ANIMATION_CACHE) { 2497 mGroupFlags &= ~FLAG_CHILDREN_DRAWN_WITH_CACHE; 2498 if ((mPersistentDrawingCache & PERSISTENT_ANIMATION_CACHE) == 0) { 2499 setChildrenDrawingCacheEnabled(false); 2500 } 2501 } 2502 2503 invalidate(true); 2504 } 2505 2506 /** 2507 * This method is used to cause children of this ViewGroup to restore or recreate their 2508 * display lists. It is called by getDisplayList() when the parent ViewGroup does not need 2509 * to recreate its own display list, which would happen if it went through the normal 2510 * draw/dispatchDraw mechanisms. 2511 * 2512 * @hide 2513 */ 2514 @Override 2515 protected void dispatchGetDisplayList() { 2516 final int count = mChildrenCount; 2517 final View[] children = mChildren; 2518 for (int i = 0; i < count; i++) { 2519 final View child = children[i]; 2520 if ((child.mViewFlags & VISIBILITY_MASK) == VISIBLE || child.getAnimation() != null) { 2521 child.mRecreateDisplayList = (child.mPrivateFlags & INVALIDATED) == INVALIDATED; 2522 child.mPrivateFlags &= ~INVALIDATED; 2523 child.getDisplayList(); 2524 child.mRecreateDisplayList = false; 2525 } 2526 } 2527 } 2528 2529 /** 2530 * Draw one child of this View Group. This method is responsible for getting 2531 * the canvas in the right state. This includes clipping, translating so 2532 * that the child's scrolled origin is at 0, 0, and applying any animation 2533 * transformations. 2534 * 2535 * @param canvas The canvas on which to draw the child 2536 * @param child Who to draw 2537 * @param drawingTime The time at which draw is occuring 2538 * @return True if an invalidate() was issued 2539 */ 2540 protected boolean drawChild(Canvas canvas, View child, long drawingTime) { 2541 boolean more = false; 2542 2543 final int cl = child.mLeft; 2544 final int ct = child.mTop; 2545 final int cr = child.mRight; 2546 final int cb = child.mBottom; 2547 2548 final boolean childHasIdentityMatrix = child.hasIdentityMatrix(); 2549 2550 final int flags = mGroupFlags; 2551 2552 if ((flags & FLAG_CLEAR_TRANSFORMATION) == FLAG_CLEAR_TRANSFORMATION) { 2553 mChildTransformation.clear(); 2554 mGroupFlags &= ~FLAG_CLEAR_TRANSFORMATION; 2555 } 2556 2557 Transformation transformToApply = null; 2558 Transformation invalidationTransform; 2559 final Animation a = child.getAnimation(); 2560 boolean concatMatrix = false; 2561 2562 boolean scalingRequired = false; 2563 boolean caching; 2564 int layerType = mDrawLayers ? child.getLayerType() : LAYER_TYPE_NONE; 2565 2566 final boolean hardwareAccelerated = canvas.isHardwareAccelerated(); 2567 if ((flags & FLAG_CHILDREN_DRAWN_WITH_CACHE) == FLAG_CHILDREN_DRAWN_WITH_CACHE || 2568 (flags & FLAG_ALWAYS_DRAWN_WITH_CACHE) == FLAG_ALWAYS_DRAWN_WITH_CACHE) { 2569 caching = true; 2570 if (mAttachInfo != null) scalingRequired = mAttachInfo.mScalingRequired; 2571 } else { 2572 caching = (layerType != LAYER_TYPE_NONE) || hardwareAccelerated; 2573 } 2574 2575 if (a != null) { 2576 final boolean initialized = a.isInitialized(); 2577 if (!initialized) { 2578 a.initialize(cr - cl, cb - ct, getWidth(), getHeight()); 2579 a.initializeInvalidateRegion(0, 0, cr - cl, cb - ct); 2580 child.onAnimationStart(); 2581 } 2582 2583 more = a.getTransformation(drawingTime, mChildTransformation, 2584 scalingRequired ? mAttachInfo.mApplicationScale : 1f); 2585 if (scalingRequired && mAttachInfo.mApplicationScale != 1f) { 2586 if (mInvalidationTransformation == null) { 2587 mInvalidationTransformation = new Transformation(); 2588 } 2589 invalidationTransform = mInvalidationTransformation; 2590 a.getTransformation(drawingTime, invalidationTransform, 1f); 2591 } else { 2592 invalidationTransform = mChildTransformation; 2593 } 2594 transformToApply = mChildTransformation; 2595 2596 concatMatrix = a.willChangeTransformationMatrix(); 2597 2598 if (more) { 2599 if (!a.willChangeBounds()) { 2600 if ((flags & (FLAG_OPTIMIZE_INVALIDATE | FLAG_ANIMATION_DONE)) == 2601 FLAG_OPTIMIZE_INVALIDATE) { 2602 mGroupFlags |= FLAG_INVALIDATE_REQUIRED; 2603 } else if ((flags & FLAG_INVALIDATE_REQUIRED) == 0) { 2604 // The child need to draw an animation, potentially offscreen, so 2605 // make sure we do not cancel invalidate requests 2606 mPrivateFlags |= DRAW_ANIMATION; 2607 invalidate(cl, ct, cr, cb); 2608 } 2609 } else { 2610 if (mInvalidateRegion == null) { 2611 mInvalidateRegion = new RectF(); 2612 } 2613 final RectF region = mInvalidateRegion; 2614 a.getInvalidateRegion(0, 0, cr - cl, cb - ct, region, invalidationTransform); 2615 2616 // The child need to draw an animation, potentially offscreen, so 2617 // make sure we do not cancel invalidate requests 2618 mPrivateFlags |= DRAW_ANIMATION; 2619 2620 final int left = cl + (int) region.left; 2621 final int top = ct + (int) region.top; 2622 invalidate(left, top, left + (int) region.width(), top + (int) region.height()); 2623 } 2624 } 2625 } else if ((flags & FLAG_SUPPORT_STATIC_TRANSFORMATIONS) == 2626 FLAG_SUPPORT_STATIC_TRANSFORMATIONS) { 2627 final boolean hasTransform = getChildStaticTransformation(child, mChildTransformation); 2628 if (hasTransform) { 2629 final int transformType = mChildTransformation.getTransformationType(); 2630 transformToApply = transformType != Transformation.TYPE_IDENTITY ? 2631 mChildTransformation : null; 2632 concatMatrix = (transformType & Transformation.TYPE_MATRIX) != 0; 2633 } 2634 } 2635 2636 concatMatrix |= !childHasIdentityMatrix; 2637 2638 // Sets the flag as early as possible to allow draw() implementations 2639 // to call invalidate() successfully when doing animations 2640 child.mPrivateFlags |= DRAWN; 2641 2642 if (!concatMatrix && canvas.quickReject(cl, ct, cr, cb, Canvas.EdgeType.BW) && 2643 (child.mPrivateFlags & DRAW_ANIMATION) == 0) { 2644 return more; 2645 } 2646 2647 float alpha = child.getAlpha(); 2648 // Bail out early if the view does not need to be drawn 2649 if (alpha <= ViewConfiguration.ALPHA_THRESHOLD && (child.mPrivateFlags & ALPHA_SET) == 0 && 2650 !(child instanceof SurfaceView)) { 2651 return more; 2652 } 2653 2654 if (hardwareAccelerated) { 2655 // Clear INVALIDATED flag to allow invalidation to occur during rendering, but 2656 // retain the flag's value temporarily in the mRecreateDisplayList flag 2657 child.mRecreateDisplayList = (child.mPrivateFlags & INVALIDATED) == INVALIDATED; 2658 child.mPrivateFlags &= ~INVALIDATED; 2659 } 2660 2661 child.computeScroll(); 2662 2663 final int sx = child.mScrollX; 2664 final int sy = child.mScrollY; 2665 2666 DisplayList displayList = null; 2667 Bitmap cache = null; 2668 boolean hasDisplayList = false; 2669 if (caching) { 2670 if (!hardwareAccelerated) { 2671 if (layerType != LAYER_TYPE_NONE) { 2672 layerType = LAYER_TYPE_SOFTWARE; 2673 child.buildDrawingCache(true); 2674 } 2675 cache = child.getDrawingCache(true); 2676 } else { 2677 switch (layerType) { 2678 case LAYER_TYPE_SOFTWARE: 2679 child.buildDrawingCache(true); 2680 cache = child.getDrawingCache(true); 2681 break; 2682 case LAYER_TYPE_NONE: 2683 // Delay getting the display list until animation-driven alpha values are 2684 // set up and possibly passed on to the view 2685 hasDisplayList = child.canHaveDisplayList(); 2686 break; 2687 } 2688 } 2689 } 2690 2691 final boolean hasNoCache = cache == null || hasDisplayList; 2692 final boolean offsetForScroll = cache == null && !hasDisplayList && 2693 layerType != LAYER_TYPE_HARDWARE; 2694 2695 final int restoreTo = canvas.save(); 2696 if (offsetForScroll) { 2697 canvas.translate(cl - sx, ct - sy); 2698 } else { 2699 canvas.translate(cl, ct); 2700 if (scalingRequired) { 2701 // mAttachInfo cannot be null, otherwise scalingRequired == false 2702 final float scale = 1.0f / mAttachInfo.mApplicationScale; 2703 canvas.scale(scale, scale); 2704 } 2705 } 2706 2707 if (transformToApply != null || alpha < 1.0f || !child.hasIdentityMatrix()) { 2708 if (transformToApply != null || !childHasIdentityMatrix) { 2709 int transX = 0; 2710 int transY = 0; 2711 2712 if (offsetForScroll) { 2713 transX = -sx; 2714 transY = -sy; 2715 } 2716 2717 if (transformToApply != null) { 2718 if (concatMatrix) { 2719 // Undo the scroll translation, apply the transformation matrix, 2720 // then redo the scroll translate to get the correct result. 2721 canvas.translate(-transX, -transY); 2722 canvas.concat(transformToApply.getMatrix()); 2723 canvas.translate(transX, transY); 2724 mGroupFlags |= FLAG_CLEAR_TRANSFORMATION; 2725 } 2726 2727 float transformAlpha = transformToApply.getAlpha(); 2728 if (transformAlpha < 1.0f) { 2729 alpha *= transformToApply.getAlpha(); 2730 mGroupFlags |= FLAG_CLEAR_TRANSFORMATION; 2731 } 2732 } 2733 2734 if (!childHasIdentityMatrix) { 2735 canvas.translate(-transX, -transY); 2736 canvas.concat(child.getMatrix()); 2737 canvas.translate(transX, transY); 2738 } 2739 } 2740 2741 if (alpha < 1.0f) { 2742 mGroupFlags |= FLAG_CLEAR_TRANSFORMATION; 2743 if (hasNoCache) { 2744 final int multipliedAlpha = (int) (255 * alpha); 2745 if (!child.onSetAlpha(multipliedAlpha)) { 2746 int layerFlags = Canvas.HAS_ALPHA_LAYER_SAVE_FLAG; 2747 if ((flags & FLAG_CLIP_CHILDREN) == FLAG_CLIP_CHILDREN || 2748 layerType != LAYER_TYPE_NONE) { 2749 layerFlags |= Canvas.CLIP_TO_LAYER_SAVE_FLAG; 2750 } 2751 if (layerType == LAYER_TYPE_NONE) { 2752 final int scrollX = hasDisplayList ? 0 : sx; 2753 final int scrollY = hasDisplayList ? 0 : sy; 2754 canvas.saveLayerAlpha(scrollX, scrollY, scrollX + cr - cl, 2755 scrollY + cb - ct, multipliedAlpha, layerFlags); 2756 } 2757 } else { 2758 // Alpha is handled by the child directly, clobber the layer's alpha 2759 child.mPrivateFlags |= ALPHA_SET; 2760 } 2761 } 2762 } 2763 } else if ((child.mPrivateFlags & ALPHA_SET) == ALPHA_SET) { 2764 child.onSetAlpha(255); 2765 child.mPrivateFlags &= ~ALPHA_SET; 2766 } 2767 2768 if ((flags & FLAG_CLIP_CHILDREN) == FLAG_CLIP_CHILDREN) { 2769 if (offsetForScroll) { 2770 canvas.clipRect(sx, sy, sx + (cr - cl), sy + (cb - ct)); 2771 } else { 2772 if (!scalingRequired || cache == null) { 2773 canvas.clipRect(0, 0, cr - cl, cb - ct); 2774 } else { 2775 canvas.clipRect(0, 0, cache.getWidth(), cache.getHeight()); 2776 } 2777 } 2778 } 2779 2780 if (hasDisplayList) { 2781 displayList = child.getDisplayList(); 2782 } 2783 2784 if (hasNoCache) { 2785 boolean layerRendered = false; 2786 if (layerType == LAYER_TYPE_HARDWARE) { 2787 final HardwareLayer layer = child.getHardwareLayer(); 2788 if (layer != null && layer.isValid()) { 2789 child.mLayerPaint.setAlpha((int) (alpha * 255)); 2790 ((HardwareCanvas) canvas).drawHardwareLayer(layer, 0, 0, child.mLayerPaint); 2791 layerRendered = true; 2792 } else { 2793 final int scrollX = hasDisplayList ? 0 : sx; 2794 final int scrollY = hasDisplayList ? 0 : sy; 2795 canvas.saveLayer(scrollX, scrollY, 2796 scrollX + cr - cl, scrollY + cb - ct, child.mLayerPaint, 2797 Canvas.HAS_ALPHA_LAYER_SAVE_FLAG | Canvas.CLIP_TO_LAYER_SAVE_FLAG); 2798 } 2799 } 2800 2801 if (!layerRendered) { 2802 if (!hasDisplayList) { 2803 // Fast path for layouts with no backgrounds 2804 if ((child.mPrivateFlags & SKIP_DRAW) == SKIP_DRAW) { 2805 if (ViewDebug.TRACE_HIERARCHY) { 2806 ViewDebug.trace(this, ViewDebug.HierarchyTraceType.DRAW); 2807 } 2808 child.mPrivateFlags &= ~DIRTY_MASK; 2809 child.dispatchDraw(canvas); 2810 } else { 2811 child.draw(canvas); 2812 } 2813 } else { 2814 child.mPrivateFlags &= ~DIRTY_MASK; 2815 ((HardwareCanvas) canvas).drawDisplayList(displayList, cr - cl, cb - ct, null); 2816 } 2817 } 2818 } else if (cache != null) { 2819 child.mPrivateFlags &= ~DIRTY_MASK; 2820 Paint cachePaint; 2821 2822 if (layerType == LAYER_TYPE_NONE) { 2823 cachePaint = mCachePaint; 2824 if (alpha < 1.0f) { 2825 cachePaint.setAlpha((int) (alpha * 255)); 2826 mGroupFlags |= FLAG_ALPHA_LOWER_THAN_ONE; 2827 } else if ((flags & FLAG_ALPHA_LOWER_THAN_ONE) == FLAG_ALPHA_LOWER_THAN_ONE) { 2828 cachePaint.setAlpha(255); 2829 mGroupFlags &= ~FLAG_ALPHA_LOWER_THAN_ONE; 2830 } 2831 } else { 2832 cachePaint = child.mLayerPaint; 2833 cachePaint.setAlpha((int) (alpha * 255)); 2834 } 2835 canvas.drawBitmap(cache, 0.0f, 0.0f, cachePaint); 2836 } 2837 2838 canvas.restoreToCount(restoreTo); 2839 2840 if (a != null && !more) { 2841 if (!hardwareAccelerated && !a.getFillAfter()) { 2842 child.onSetAlpha(255); 2843 } 2844 finishAnimatingView(child, a); 2845 } 2846 2847 if (more && hardwareAccelerated) { 2848 // invalidation is the trigger to recreate display lists, so if we're using 2849 // display lists to render, force an invalidate to allow the animation to 2850 // continue drawing another frame 2851 invalidate(true); 2852 if (a instanceof AlphaAnimation) { 2853 // alpha animations should cause the child to recreate its display list 2854 child.invalidate(true); 2855 } 2856 } 2857 2858 child.mRecreateDisplayList = false; 2859 2860 return more; 2861 } 2862 2863 /** 2864 * 2865 * @param enabled True if children should be drawn with layers, false otherwise. 2866 * 2867 * @hide 2868 */ 2869 public void setChildrenLayersEnabled(boolean enabled) { 2870 if (enabled != mDrawLayers) { 2871 mDrawLayers = enabled; 2872 invalidate(true); 2873 2874 // We need to invalidate any child with a layer. For instance, 2875 // if a child is backed by a hardware layer and we disable layers 2876 // the child is marked as not dirty (flags cleared the last time 2877 // the child was drawn inside its layer.) However, that child might 2878 // never have created its own display list or have an obsolete 2879 // display list. By invalidating the child we ensure the display 2880 // list is in sync with the content of the hardware layer. 2881 for (int i = 0; i < mChildrenCount; i++) { 2882 View child = mChildren[i]; 2883 if (child.mLayerType != LAYER_TYPE_NONE) { 2884 child.invalidate(true); 2885 } 2886 } 2887 } 2888 } 2889 2890 /** 2891 * By default, children are clipped to their bounds before drawing. This 2892 * allows view groups to override this behavior for animations, etc. 2893 * 2894 * @param clipChildren true to clip children to their bounds, 2895 * false otherwise 2896 * @attr ref android.R.styleable#ViewGroup_clipChildren 2897 */ 2898 public void setClipChildren(boolean clipChildren) { 2899 setBooleanFlag(FLAG_CLIP_CHILDREN, clipChildren); 2900 } 2901 2902 /** 2903 * By default, children are clipped to the padding of the ViewGroup. This 2904 * allows view groups to override this behavior 2905 * 2906 * @param clipToPadding true to clip children to the padding of the 2907 * group, false otherwise 2908 * @attr ref android.R.styleable#ViewGroup_clipToPadding 2909 */ 2910 public void setClipToPadding(boolean clipToPadding) { 2911 setBooleanFlag(FLAG_CLIP_TO_PADDING, clipToPadding); 2912 } 2913 2914 /** 2915 * {@inheritDoc} 2916 */ 2917 @Override 2918 public void dispatchSetSelected(boolean selected) { 2919 final View[] children = mChildren; 2920 final int count = mChildrenCount; 2921 for (int i = 0; i < count; i++) { 2922 children[i].setSelected(selected); 2923 } 2924 } 2925 2926 /** 2927 * {@inheritDoc} 2928 */ 2929 @Override 2930 public void dispatchSetActivated(boolean activated) { 2931 final View[] children = mChildren; 2932 final int count = mChildrenCount; 2933 for (int i = 0; i < count; i++) { 2934 children[i].setActivated(activated); 2935 } 2936 } 2937 2938 @Override 2939 protected void dispatchSetPressed(boolean pressed) { 2940 final View[] children = mChildren; 2941 final int count = mChildrenCount; 2942 for (int i = 0; i < count; i++) { 2943 children[i].setPressed(pressed); 2944 } 2945 } 2946 2947 /** 2948 * When this property is set to true, this ViewGroup supports static transformations on 2949 * children; this causes 2950 * {@link #getChildStaticTransformation(View, android.view.animation.Transformation)} to be 2951 * invoked when a child is drawn. 2952 * 2953 * Any subclass overriding 2954 * {@link #getChildStaticTransformation(View, android.view.animation.Transformation)} should 2955 * set this property to true. 2956 * 2957 * @param enabled True to enable static transformations on children, false otherwise. 2958 * 2959 * @see #FLAG_SUPPORT_STATIC_TRANSFORMATIONS 2960 */ 2961 protected void setStaticTransformationsEnabled(boolean enabled) { 2962 setBooleanFlag(FLAG_SUPPORT_STATIC_TRANSFORMATIONS, enabled); 2963 } 2964 2965 /** 2966 * {@inheritDoc} 2967 * 2968 * @see #setStaticTransformationsEnabled(boolean) 2969 */ 2970 protected boolean getChildStaticTransformation(View child, Transformation t) { 2971 return false; 2972 } 2973 2974 /** 2975 * {@hide} 2976 */ 2977 @Override 2978 protected View findViewTraversal(int id) { 2979 if (id == mID) { 2980 return this; 2981 } 2982 2983 final View[] where = mChildren; 2984 final int len = mChildrenCount; 2985 2986 for (int i = 0; i < len; i++) { 2987 View v = where[i]; 2988 2989 if ((v.mPrivateFlags & IS_ROOT_NAMESPACE) == 0) { 2990 v = v.findViewById(id); 2991 2992 if (v != null) { 2993 return v; 2994 } 2995 } 2996 } 2997 2998 return null; 2999 } 3000 3001 /** 3002 * {@hide} 3003 */ 3004 @Override 3005 protected View findViewWithTagTraversal(Object tag) { 3006 if (tag != null && tag.equals(mTag)) { 3007 return this; 3008 } 3009 3010 final View[] where = mChildren; 3011 final int len = mChildrenCount; 3012 3013 for (int i = 0; i < len; i++) { 3014 View v = where[i]; 3015 3016 if ((v.mPrivateFlags & IS_ROOT_NAMESPACE) == 0) { 3017 v = v.findViewWithTag(tag); 3018 3019 if (v != null) { 3020 return v; 3021 } 3022 } 3023 } 3024 3025 return null; 3026 } 3027 3028 /** 3029 * {@hide} 3030 */ 3031 @Override 3032 protected View findViewByPredicateTraversal(Predicate<View> predicate) { 3033 if (predicate.apply(this)) { 3034 return this; 3035 } 3036 3037 final View[] where = mChildren; 3038 final int len = mChildrenCount; 3039 3040 for (int i = 0; i < len; i++) { 3041 View v = where[i]; 3042 3043 if ((v.mPrivateFlags & IS_ROOT_NAMESPACE) == 0) { 3044 v = v.findViewByPredicate(predicate); 3045 3046 if (v != null) { 3047 return v; 3048 } 3049 } 3050 } 3051 3052 return null; 3053 } 3054 3055 /** 3056 * Adds a child view. If no layout parameters are already set on the child, the 3057 * default parameters for this ViewGroup are set on the child. 3058 * 3059 * @param child the child view to add 3060 * 3061 * @see #generateDefaultLayoutParams() 3062 */ 3063 public void addView(View child) { 3064 addView(child, -1); 3065 } 3066 3067 /** 3068 * Adds a child view. If no layout parameters are already set on the child, the 3069 * default parameters for this ViewGroup are set on the child. 3070 * 3071 * @param child the child view to add 3072 * @param index the position at which to add the child 3073 * 3074 * @see #generateDefaultLayoutParams() 3075 */ 3076 public void addView(View child, int index) { 3077 LayoutParams params = child.getLayoutParams(); 3078 if (params == null) { 3079 params = generateDefaultLayoutParams(); 3080 if (params == null) { 3081 throw new IllegalArgumentException("generateDefaultLayoutParams() cannot return null"); 3082 } 3083 } 3084 addView(child, index, params); 3085 } 3086 3087 /** 3088 * Adds a child view with this ViewGroup's default layout parameters and the 3089 * specified width and height. 3090 * 3091 * @param child the child view to add 3092 */ 3093 public void addView(View child, int width, int height) { 3094 final LayoutParams params = generateDefaultLayoutParams(); 3095 params.width = width; 3096 params.height = height; 3097 addView(child, -1, params); 3098 } 3099 3100 /** 3101 * Adds a child view with the specified layout parameters. 3102 * 3103 * @param child the child view to add 3104 * @param params the layout parameters to set on the child 3105 */ 3106 public void addView(View child, LayoutParams params) { 3107 addView(child, -1, params); 3108 } 3109 3110 /** 3111 * Adds a child view with the specified layout parameters. 3112 * 3113 * @param child the child view to add 3114 * @param index the position at which to add the child 3115 * @param params the layout parameters to set on the child 3116 */ 3117 public void addView(View child, int index, LayoutParams params) { 3118 if (DBG) { 3119 System.out.println(this + " addView"); 3120 } 3121 3122 // addViewInner() will call child.requestLayout() when setting the new LayoutParams 3123 // therefore, we call requestLayout() on ourselves before, so that the child's request 3124 // will be blocked at our level 3125 requestLayout(); 3126 invalidate(true); 3127 addViewInner(child, index, params, false); 3128 } 3129 3130 /** 3131 * {@inheritDoc} 3132 */ 3133 public void updateViewLayout(View view, ViewGroup.LayoutParams params) { 3134 if (!checkLayoutParams(params)) { 3135 throw new IllegalArgumentException("Invalid LayoutParams supplied to " + this); 3136 } 3137 if (view.mParent != this) { 3138 throw new IllegalArgumentException("Given view not a child of " + this); 3139 } 3140 view.setLayoutParams(params); 3141 } 3142 3143 /** 3144 * {@inheritDoc} 3145 */ 3146 protected boolean checkLayoutParams(ViewGroup.LayoutParams p) { 3147 return p != null; 3148 } 3149 3150 /** 3151 * Interface definition for a callback to be invoked when the hierarchy 3152 * within this view changed. The hierarchy changes whenever a child is added 3153 * to or removed from this view. 3154 */ 3155 public interface OnHierarchyChangeListener { 3156 /** 3157 * Called when a new child is added to a parent view. 3158 * 3159 * @param parent the view in which a child was added 3160 * @param child the new child view added in the hierarchy 3161 */ 3162 void onChildViewAdded(View parent, View child); 3163 3164 /** 3165 * Called when a child is removed from a parent view. 3166 * 3167 * @param parent the view from which the child was removed 3168 * @param child the child removed from the hierarchy 3169 */ 3170 void onChildViewRemoved(View parent, View child); 3171 } 3172 3173 /** 3174 * Register a callback to be invoked when a child is added to or removed 3175 * from this view. 3176 * 3177 * @param listener the callback to invoke on hierarchy change 3178 */ 3179 public void setOnHierarchyChangeListener(OnHierarchyChangeListener listener) { 3180 mOnHierarchyChangeListener = listener; 3181 } 3182 3183 /** 3184 * Adds a view during layout. This is useful if in your onLayout() method, 3185 * you need to add more views (as does the list view for example). 3186 * 3187 * If index is negative, it means put it at the end of the list. 3188 * 3189 * @param child the view to add to the group 3190 * @param index the index at which the child must be added 3191 * @param params the layout parameters to associate with the child 3192 * @return true if the child was added, false otherwise 3193 */ 3194 protected boolean addViewInLayout(View child, int index, LayoutParams params) { 3195 return addViewInLayout(child, index, params, false); 3196 } 3197 3198 /** 3199 * Adds a view during layout. This is useful if in your onLayout() method, 3200 * you need to add more views (as does the list view for example). 3201 * 3202 * If index is negative, it means put it at the end of the list. 3203 * 3204 * @param child the view to add to the group 3205 * @param index the index at which the child must be added 3206 * @param params the layout parameters to associate with the child 3207 * @param preventRequestLayout if true, calling this method will not trigger a 3208 * layout request on child 3209 * @return true if the child was added, false otherwise 3210 */ 3211 protected boolean addViewInLayout(View child, int index, LayoutParams params, 3212 boolean preventRequestLayout) { 3213 child.mParent = null; 3214 addViewInner(child, index, params, preventRequestLayout); 3215 child.mPrivateFlags = (child.mPrivateFlags & ~DIRTY_MASK) | DRAWN; 3216 return true; 3217 } 3218 3219 /** 3220 * Prevents the specified child to be laid out during the next layout pass. 3221 * 3222 * @param child the child on which to perform the cleanup 3223 */ 3224 protected void cleanupLayoutState(View child) { 3225 child.mPrivateFlags &= ~View.FORCE_LAYOUT; 3226 } 3227 3228 private void addViewInner(View child, int index, LayoutParams params, 3229 boolean preventRequestLayout) { 3230 3231 if (mTransition != null) { 3232 // Don't prevent other add transitions from completing, but cancel remove 3233 // transitions to let them complete the process before we add to the container 3234 mTransition.cancel(LayoutTransition.DISAPPEARING); 3235 } 3236 3237 if (child.getParent() != null) { 3238 throw new IllegalStateException("The specified child already has a parent. " + 3239 "You must call removeView() on the child's parent first."); 3240 } 3241 3242 if (mTransition != null) { 3243 mTransition.addChild(this, child); 3244 } 3245 3246 if (!checkLayoutParams(params)) { 3247 params = generateLayoutParams(params); 3248 } 3249 3250 if (preventRequestLayout) { 3251 child.mLayoutParams = params; 3252 } else { 3253 child.setLayoutParams(params); 3254 } 3255 3256 if (index < 0) { 3257 index = mChildrenCount; 3258 } 3259 3260 addInArray(child, index); 3261 3262 // tell our children 3263 if (preventRequestLayout) { 3264 child.assignParent(this); 3265 } else { 3266 child.mParent = this; 3267 } 3268 3269 if (child.hasFocus()) { 3270 requestChildFocus(child, child.findFocus()); 3271 } 3272 3273 AttachInfo ai = mAttachInfo; 3274 if (ai != null) { 3275 boolean lastKeepOn = ai.mKeepScreenOn; 3276 ai.mKeepScreenOn = false; 3277 child.dispatchAttachedToWindow(mAttachInfo, (mViewFlags&VISIBILITY_MASK)); 3278 if (ai.mKeepScreenOn) { 3279 needGlobalAttributesUpdate(true); 3280 } 3281 ai.mKeepScreenOn = lastKeepOn; 3282 } 3283 3284 if (mOnHierarchyChangeListener != null) { 3285 mOnHierarchyChangeListener.onChildViewAdded(this, child); 3286 } 3287 3288 if ((child.mViewFlags & DUPLICATE_PARENT_STATE) == DUPLICATE_PARENT_STATE) { 3289 mGroupFlags |= FLAG_NOTIFY_CHILDREN_ON_DRAWABLE_STATE_CHANGE; 3290 } 3291 } 3292 3293 private void addInArray(View child, int index) { 3294 View[] children = mChildren; 3295 final int count = mChildrenCount; 3296 final int size = children.length; 3297 if (index == count) { 3298 if (size == count) { 3299 mChildren = new View[size + ARRAY_CAPACITY_INCREMENT]; 3300 System.arraycopy(children, 0, mChildren, 0, size); 3301 children = mChildren; 3302 } 3303 children[mChildrenCount++] = child; 3304 } else if (index < count) { 3305 if (size == count) { 3306 mChildren = new View[size + ARRAY_CAPACITY_INCREMENT]; 3307 System.arraycopy(children, 0, mChildren, 0, index); 3308 System.arraycopy(children, index, mChildren, index + 1, count - index); 3309 children = mChildren; 3310 } else { 3311 System.arraycopy(children, index, children, index + 1, count - index); 3312 } 3313 children[index] = child; 3314 mChildrenCount++; 3315 if (mLastTouchDownIndex >= index) { 3316 mLastTouchDownIndex++; 3317 } 3318 } else { 3319 throw new IndexOutOfBoundsException("index=" + index + " count=" + count); 3320 } 3321 } 3322 3323 // This method also sets the child's mParent to null 3324 private void removeFromArray(int index) { 3325 final View[] children = mChildren; 3326 if (!(mTransitioningViews != null && mTransitioningViews.contains(children[index]))) { 3327 children[index].mParent = null; 3328 } 3329 final int count = mChildrenCount; 3330 if (index == count - 1) { 3331 children[--mChildrenCount] = null; 3332 } else if (index >= 0 && index < count) { 3333 System.arraycopy(children, index + 1, children, index, count - index - 1); 3334 children[--mChildrenCount] = null; 3335 } else { 3336 throw new IndexOutOfBoundsException(); 3337 } 3338 if (mLastTouchDownIndex == index) { 3339 mLastTouchDownTime = 0; 3340 mLastTouchDownIndex = -1; 3341 } else if (mLastTouchDownIndex > index) { 3342 mLastTouchDownIndex--; 3343 } 3344 } 3345 3346 // This method also sets the children's mParent to null 3347 private void removeFromArray(int start, int count) { 3348 final View[] children = mChildren; 3349 final int childrenCount = mChildrenCount; 3350 3351 start = Math.max(0, start); 3352 final int end = Math.min(childrenCount, start + count); 3353 3354 if (start == end) { 3355 return; 3356 } 3357 3358 if (end == childrenCount) { 3359 for (int i = start; i < end; i++) { 3360 children[i].mParent = null; 3361 children[i] = null; 3362 } 3363 } else { 3364 for (int i = start; i < end; i++) { 3365 children[i].mParent = null; 3366 } 3367 3368 // Since we're looping above, we might as well do the copy, but is arraycopy() 3369 // faster than the extra 2 bounds checks we would do in the loop? 3370 System.arraycopy(children, end, children, start, childrenCount - end); 3371 3372 for (int i = childrenCount - (end - start); i < childrenCount; i++) { 3373 children[i] = null; 3374 } 3375 } 3376 3377 mChildrenCount -= (end - start); 3378 } 3379 3380 private void bindLayoutAnimation(View child) { 3381 Animation a = mLayoutAnimationController.getAnimationForView(child); 3382 child.setAnimation(a); 3383 } 3384 3385 /** 3386 * Subclasses should override this method to set layout animation 3387 * parameters on the supplied child. 3388 * 3389 * @param child the child to associate with animation parameters 3390 * @param params the child's layout parameters which hold the animation 3391 * parameters 3392 * @param index the index of the child in the view group 3393 * @param count the number of children in the view group 3394 */ 3395 protected void attachLayoutAnimationParameters(View child, 3396 LayoutParams params, int index, int count) { 3397 LayoutAnimationController.AnimationParameters animationParams = 3398 params.layoutAnimationParameters; 3399 if (animationParams == null) { 3400 animationParams = new LayoutAnimationController.AnimationParameters(); 3401 params.layoutAnimationParameters = animationParams; 3402 } 3403 3404 animationParams.count = count; 3405 animationParams.index = index; 3406 } 3407 3408 /** 3409 * {@inheritDoc} 3410 */ 3411 public void removeView(View view) { 3412 removeViewInternal(view); 3413 requestLayout(); 3414 invalidate(true); 3415 } 3416 3417 /** 3418 * Removes a view during layout. This is useful if in your onLayout() method, 3419 * you need to remove more views. 3420 * 3421 * @param view the view to remove from the group 3422 */ 3423 public void removeViewInLayout(View view) { 3424 removeViewInternal(view); 3425 } 3426 3427 /** 3428 * Removes a range of views during layout. This is useful if in your onLayout() method, 3429 * you need to remove more views. 3430 * 3431 * @param start the index of the first view to remove from the group 3432 * @param count the number of views to remove from the group 3433 */ 3434 public void removeViewsInLayout(int start, int count) { 3435 removeViewsInternal(start, count); 3436 } 3437 3438 /** 3439 * Removes the view at the specified position in the group. 3440 * 3441 * @param index the position in the group of the view to remove 3442 */ 3443 public void removeViewAt(int index) { 3444 removeViewInternal(index, getChildAt(index)); 3445 requestLayout(); 3446 invalidate(true); 3447 } 3448 3449 /** 3450 * Removes the specified range of views from the group. 3451 * 3452 * @param start the first position in the group of the range of views to remove 3453 * @param count the number of views to remove 3454 */ 3455 public void removeViews(int start, int count) { 3456 removeViewsInternal(start, count); 3457 requestLayout(); 3458 invalidate(true); 3459 } 3460 3461 private void removeViewInternal(View view) { 3462 final int index = indexOfChild(view); 3463 if (index >= 0) { 3464 removeViewInternal(index, view); 3465 } 3466 } 3467 3468 private void removeViewInternal(int index, View view) { 3469 3470 if (mTransition != null) { 3471 mTransition.removeChild(this, view); 3472 } 3473 3474 boolean clearChildFocus = false; 3475 if (view == mFocused) { 3476 view.clearFocusForRemoval(); 3477 clearChildFocus = true; 3478 } 3479 3480 if (view.getAnimation() != null || 3481 (mTransitioningViews != null && mTransitioningViews.contains(view))) { 3482 addDisappearingView(view); 3483 } else if (view.mAttachInfo != null) { 3484 view.dispatchDetachedFromWindow(); 3485 } 3486 3487 if (mOnHierarchyChangeListener != null) { 3488 mOnHierarchyChangeListener.onChildViewRemoved(this, view); 3489 } 3490 3491 needGlobalAttributesUpdate(false); 3492 3493 removeFromArray(index); 3494 3495 if (clearChildFocus) { 3496 clearChildFocus(view); 3497 } 3498 } 3499 3500 /** 3501 * Sets the LayoutTransition object for this ViewGroup. If the LayoutTransition object is 3502 * not null, changes in layout which occur because of children being added to or removed from 3503 * the ViewGroup will be animated according to the animations defined in that LayoutTransition 3504 * object. By default, the transition object is null (so layout changes are not animated). 3505 * 3506 * @param transition The LayoutTransition object that will animated changes in layout. A value 3507 * of <code>null</code> means no transition will run on layout changes. 3508 * @attr ref android.R.styleable#ViewGroup_animateLayoutChanges 3509 */ 3510 public void setLayoutTransition(LayoutTransition transition) { 3511 if (mTransition != null) { 3512 mTransition.removeTransitionListener(mLayoutTransitionListener); 3513 } 3514 mTransition = transition; 3515 if (mTransition != null) { 3516 mTransition.addTransitionListener(mLayoutTransitionListener); 3517 } 3518 } 3519 3520 /** 3521 * Gets the LayoutTransition object for this ViewGroup. If the LayoutTransition object is 3522 * not null, changes in layout which occur because of children being added to or removed from 3523 * the ViewGroup will be animated according to the animations defined in that LayoutTransition 3524 * object. By default, the transition object is null (so layout changes are not animated). 3525 * 3526 * @return LayoutTranstion The LayoutTransition object that will animated changes in layout. 3527 * A value of <code>null</code> means no transition will run on layout changes. 3528 */ 3529 public LayoutTransition getLayoutTransition() { 3530 return mTransition; 3531 } 3532 3533 private void removeViewsInternal(int start, int count) { 3534 final OnHierarchyChangeListener onHierarchyChangeListener = mOnHierarchyChangeListener; 3535 final boolean notifyListener = onHierarchyChangeListener != null; 3536 final View focused = mFocused; 3537 final boolean detach = mAttachInfo != null; 3538 View clearChildFocus = null; 3539 3540 final View[] children = mChildren; 3541 final int end = start + count; 3542 3543 for (int i = start; i < end; i++) { 3544 final View view = children[i]; 3545 3546 if (mTransition != null) { 3547 mTransition.removeChild(this, view); 3548 } 3549 3550 if (view == focused) { 3551 view.clearFocusForRemoval(); 3552 clearChildFocus = view; 3553 } 3554 3555 if (view.getAnimation() != null || 3556 (mTransitioningViews != null && mTransitioningViews.contains(view))) { 3557 addDisappearingView(view); 3558 } else if (detach) { 3559 view.dispatchDetachedFromWindow(); 3560 } 3561 3562 needGlobalAttributesUpdate(false); 3563 3564 if (notifyListener) { 3565 onHierarchyChangeListener.onChildViewRemoved(this, view); 3566 } 3567 } 3568 3569 removeFromArray(start, count); 3570 3571 if (clearChildFocus != null) { 3572 clearChildFocus(clearChildFocus); 3573 } 3574 } 3575 3576 /** 3577 * Call this method to remove all child views from the 3578 * ViewGroup. 3579 */ 3580 public void removeAllViews() { 3581 removeAllViewsInLayout(); 3582 requestLayout(); 3583 invalidate(true); 3584 } 3585 3586 /** 3587 * Called by a ViewGroup subclass to remove child views from itself, 3588 * when it must first know its size on screen before it can calculate how many 3589 * child views it will render. An example is a Gallery or a ListView, which 3590 * may "have" 50 children, but actually only render the number of children 3591 * that can currently fit inside the object on screen. Do not call 3592 * this method unless you are extending ViewGroup and understand the 3593 * view measuring and layout pipeline. 3594 */ 3595 public void removeAllViewsInLayout() { 3596 final int count = mChildrenCount; 3597 if (count <= 0) { 3598 return; 3599 } 3600 3601 final View[] children = mChildren; 3602 mChildrenCount = 0; 3603 3604 final OnHierarchyChangeListener listener = mOnHierarchyChangeListener; 3605 final boolean notify = listener != null; 3606 final View focused = mFocused; 3607 final boolean detach = mAttachInfo != null; 3608 View clearChildFocus = null; 3609 3610 needGlobalAttributesUpdate(false); 3611 3612 for (int i = count - 1; i >= 0; i--) { 3613 final View view = children[i]; 3614 3615 if (mTransition != null) { 3616 mTransition.removeChild(this, view); 3617 } 3618 3619 if (view == focused) { 3620 view.clearFocusForRemoval(); 3621 clearChildFocus = view; 3622 } 3623 3624 if (view.getAnimation() != null || 3625 (mTransitioningViews != null && mTransitioningViews.contains(view))) { 3626 addDisappearingView(view); 3627 } else if (detach) { 3628 view.dispatchDetachedFromWindow(); 3629 } 3630 3631 if (notify) { 3632 listener.onChildViewRemoved(this, view); 3633 } 3634 3635 view.mParent = null; 3636 children[i] = null; 3637 } 3638 3639 if (clearChildFocus != null) { 3640 clearChildFocus(clearChildFocus); 3641 } 3642 } 3643 3644 /** 3645 * Finishes the removal of a detached view. This method will dispatch the detached from 3646 * window event and notify the hierarchy change listener. 3647 * 3648 * @param child the child to be definitely removed from the view hierarchy 3649 * @param animate if true and the view has an animation, the view is placed in the 3650 * disappearing views list, otherwise, it is detached from the window 3651 * 3652 * @see #attachViewToParent(View, int, android.view.ViewGroup.LayoutParams) 3653 * @see #detachAllViewsFromParent() 3654 * @see #detachViewFromParent(View) 3655 * @see #detachViewFromParent(int) 3656 */ 3657 protected void removeDetachedView(View child, boolean animate) { 3658 if (mTransition != null) { 3659 mTransition.removeChild(this, child); 3660 } 3661 3662 if (child == mFocused) { 3663 child.clearFocus(); 3664 } 3665 3666 if ((animate && child.getAnimation() != null) || 3667 (mTransitioningViews != null && mTransitioningViews.contains(child))) { 3668 addDisappearingView(child); 3669 } else if (child.mAttachInfo != null) { 3670 child.dispatchDetachedFromWindow(); 3671 } 3672 3673 if (mOnHierarchyChangeListener != null) { 3674 mOnHierarchyChangeListener.onChildViewRemoved(this, child); 3675 } 3676 } 3677 3678 /** 3679 * Attaches a view to this view group. Attaching a view assigns this group as the parent, 3680 * sets the layout parameters and puts the view in the list of children so it can be retrieved 3681 * by calling {@link #getChildAt(int)}. 3682 * 3683 * This method should be called only for view which were detached from their parent. 3684 * 3685 * @param child the child to attach 3686 * @param index the index at which the child should be attached 3687 * @param params the layout parameters of the child 3688 * 3689 * @see #removeDetachedView(View, boolean) 3690 * @see #detachAllViewsFromParent() 3691 * @see #detachViewFromParent(View) 3692 * @see #detachViewFromParent(int) 3693 */ 3694 protected void attachViewToParent(View child, int index, LayoutParams params) { 3695 child.mLayoutParams = params; 3696 3697 if (index < 0) { 3698 index = mChildrenCount; 3699 } 3700 3701 addInArray(child, index); 3702 3703 child.mParent = this; 3704 child.mPrivateFlags = (child.mPrivateFlags & ~DIRTY_MASK & ~DRAWING_CACHE_VALID) | 3705 DRAWN | INVALIDATED; 3706 this.mPrivateFlags |= INVALIDATED; 3707 3708 if (child.hasFocus()) { 3709 requestChildFocus(child, child.findFocus()); 3710 } 3711 } 3712 3713 /** 3714 * Detaches a view from its parent. Detaching a view should be temporary and followed 3715 * either by a call to {@link #attachViewToParent(View, int, android.view.ViewGroup.LayoutParams)} 3716 * or a call to {@link #removeDetachedView(View, boolean)}. When a view is detached, 3717 * its parent is null and cannot be retrieved by a call to {@link #getChildAt(int)}. 3718 * 3719 * @param child the child to detach 3720 * 3721 * @see #detachViewFromParent(int) 3722 * @see #detachViewsFromParent(int, int) 3723 * @see #detachAllViewsFromParent() 3724 * @see #attachViewToParent(View, int, android.view.ViewGroup.LayoutParams) 3725 * @see #removeDetachedView(View, boolean) 3726 */ 3727 protected void detachViewFromParent(View child) { 3728 removeFromArray(indexOfChild(child)); 3729 } 3730 3731 /** 3732 * Detaches a view from its parent. Detaching a view should be temporary and followed 3733 * either by a call to {@link #attachViewToParent(View, int, android.view.ViewGroup.LayoutParams)} 3734 * or a call to {@link #removeDetachedView(View, boolean)}. When a view is detached, 3735 * its parent is null and cannot be retrieved by a call to {@link #getChildAt(int)}. 3736 * 3737 * @param index the index of the child to detach 3738 * 3739 * @see #detachViewFromParent(View) 3740 * @see #detachAllViewsFromParent() 3741 * @see #detachViewsFromParent(int, int) 3742 * @see #attachViewToParent(View, int, android.view.ViewGroup.LayoutParams) 3743 * @see #removeDetachedView(View, boolean) 3744 */ 3745 protected void detachViewFromParent(int index) { 3746 removeFromArray(index); 3747 } 3748 3749 /** 3750 * Detaches a range of view from their parent. Detaching a view should be temporary and followed 3751 * either by a call to {@link #attachViewToParent(View, int, android.view.ViewGroup.LayoutParams)} 3752 * or a call to {@link #removeDetachedView(View, boolean)}. When a view is detached, its 3753 * parent is null and cannot be retrieved by a call to {@link #getChildAt(int)}. 3754 * 3755 * @param start the first index of the childrend range to detach 3756 * @param count the number of children to detach 3757 * 3758 * @see #detachViewFromParent(View) 3759 * @see #detachViewFromParent(int) 3760 * @see #detachAllViewsFromParent() 3761 * @see #attachViewToParent(View, int, android.view.ViewGroup.LayoutParams) 3762 * @see #removeDetachedView(View, boolean) 3763 */ 3764 protected void detachViewsFromParent(int start, int count) { 3765 removeFromArray(start, count); 3766 } 3767 3768 /** 3769 * Detaches all views from the parent. Detaching a view should be temporary and followed 3770 * either by a call to {@link #attachViewToParent(View, int, android.view.ViewGroup.LayoutParams)} 3771 * or a call to {@link #removeDetachedView(View, boolean)}. When a view is detached, 3772 * its parent is null and cannot be retrieved by a call to {@link #getChildAt(int)}. 3773 * 3774 * @see #detachViewFromParent(View) 3775 * @see #detachViewFromParent(int) 3776 * @see #detachViewsFromParent(int, int) 3777 * @see #attachViewToParent(View, int, android.view.ViewGroup.LayoutParams) 3778 * @see #removeDetachedView(View, boolean) 3779 */ 3780 protected void detachAllViewsFromParent() { 3781 final int count = mChildrenCount; 3782 if (count <= 0) { 3783 return; 3784 } 3785 3786 final View[] children = mChildren; 3787 mChildrenCount = 0; 3788 3789 for (int i = count - 1; i >= 0; i--) { 3790 children[i].mParent = null; 3791 children[i] = null; 3792 } 3793 } 3794 3795 /** 3796 * Don't call or override this method. It is used for the implementation of 3797 * the view hierarchy. 3798 */ 3799 public final void invalidateChild(View child, final Rect dirty) { 3800 if (ViewDebug.TRACE_HIERARCHY) { 3801 ViewDebug.trace(this, ViewDebug.HierarchyTraceType.INVALIDATE_CHILD); 3802 } 3803 3804 ViewParent parent = this; 3805 3806 final AttachInfo attachInfo = mAttachInfo; 3807 if (attachInfo != null) { 3808 // If the child is drawing an animation, we want to copy this flag onto 3809 // ourselves and the parent to make sure the invalidate request goes 3810 // through 3811 final boolean drawAnimation = (child.mPrivateFlags & DRAW_ANIMATION) == DRAW_ANIMATION; 3812 3813 if (dirty == null) { 3814 if (child.mLayerType != LAYER_TYPE_NONE) { 3815 mPrivateFlags |= INVALIDATED; 3816 mPrivateFlags &= ~DRAWING_CACHE_VALID; 3817 child.mLocalDirtyRect.setEmpty(); 3818 } 3819 do { 3820 View view = null; 3821 if (parent instanceof View) { 3822 view = (View) parent; 3823 if (view.mLayerType != LAYER_TYPE_NONE) { 3824 view.mLocalDirtyRect.setEmpty(); 3825 if (view.getParent() instanceof View) { 3826 final View grandParent = (View) view.getParent(); 3827 grandParent.mPrivateFlags |= INVALIDATED; 3828 grandParent.mPrivateFlags &= ~DRAWING_CACHE_VALID; 3829 } 3830 } 3831 if ((view.mPrivateFlags & DIRTY_MASK) != 0) { 3832 // already marked dirty - we're done 3833 break; 3834 } 3835 } 3836 3837 if (drawAnimation) { 3838 if (view != null) { 3839 view.mPrivateFlags |= DRAW_ANIMATION; 3840 } else if (parent instanceof ViewAncestor) { 3841 ((ViewAncestor) parent).mIsAnimating = true; 3842 } 3843 } 3844 3845 if (parent instanceof ViewAncestor) { 3846 ((ViewAncestor) parent).invalidate(); 3847 parent = null; 3848 } else if (view != null) { 3849 if ((view.mPrivateFlags & DRAWN) == DRAWN || 3850 (view.mPrivateFlags & DRAWING_CACHE_VALID) == DRAWING_CACHE_VALID) { 3851 view.mPrivateFlags &= ~DRAWING_CACHE_VALID; 3852 view.mPrivateFlags |= DIRTY; 3853 parent = view.mParent; 3854 } else { 3855 parent = null; 3856 } 3857 } 3858 } while (parent != null); 3859 } else { 3860 // Check whether the child that requests the invalidate is fully opaque 3861 final boolean isOpaque = child.isOpaque() && !drawAnimation && 3862 child.getAnimation() == null; 3863 // Mark the child as dirty, using the appropriate flag 3864 // Make sure we do not set both flags at the same time 3865 int opaqueFlag = isOpaque ? DIRTY_OPAQUE : DIRTY; 3866 3867 if (child.mLayerType != LAYER_TYPE_NONE) { 3868 mPrivateFlags |= INVALIDATED; 3869 mPrivateFlags &= ~DRAWING_CACHE_VALID; 3870 child.mLocalDirtyRect.union(dirty); 3871 } 3872 3873 final int[] location = attachInfo.mInvalidateChildLocation; 3874 location[CHILD_LEFT_INDEX] = child.mLeft; 3875 location[CHILD_TOP_INDEX] = child.mTop; 3876 Matrix childMatrix = child.getMatrix(); 3877 if (!childMatrix.isIdentity()) { 3878 RectF boundingRect = attachInfo.mTmpTransformRect; 3879 boundingRect.set(dirty); 3880 //boundingRect.inset(-0.5f, -0.5f); 3881 childMatrix.mapRect(boundingRect); 3882 dirty.set((int) (boundingRect.left - 0.5f), 3883 (int) (boundingRect.top - 0.5f), 3884 (int) (boundingRect.right + 0.5f), 3885 (int) (boundingRect.bottom + 0.5f)); 3886 } 3887 3888 do { 3889 View view = null; 3890 if (parent instanceof View) { 3891 view = (View) parent; 3892 if (view.mLayerType != LAYER_TYPE_NONE && 3893 view.getParent() instanceof View) { 3894 final View grandParent = (View) view.getParent(); 3895 grandParent.mPrivateFlags |= INVALIDATED; 3896 grandParent.mPrivateFlags &= ~DRAWING_CACHE_VALID; 3897 } 3898 } 3899 3900 if (drawAnimation) { 3901 if (view != null) { 3902 view.mPrivateFlags |= DRAW_ANIMATION; 3903 } else if (parent instanceof ViewAncestor) { 3904 ((ViewAncestor) parent).mIsAnimating = true; 3905 } 3906 } 3907 3908 // If the parent is dirty opaque or not dirty, mark it dirty with the opaque 3909 // flag coming from the child that initiated the invalidate 3910 if (view != null) { 3911 if ((view.mViewFlags & FADING_EDGE_MASK) != 0 && 3912 view.getSolidColor() == 0) { 3913 opaqueFlag = DIRTY; 3914 } 3915 if ((view.mPrivateFlags & DIRTY_MASK) != DIRTY) { 3916 view.mPrivateFlags = (view.mPrivateFlags & ~DIRTY_MASK) | opaqueFlag; 3917 } 3918 } 3919 3920 parent = parent.invalidateChildInParent(location, dirty); 3921 if (view != null) { 3922 // Account for transform on current parent 3923 Matrix m = view.getMatrix(); 3924 if (!m.isIdentity()) { 3925 RectF boundingRect = attachInfo.mTmpTransformRect; 3926 boundingRect.set(dirty); 3927 m.mapRect(boundingRect); 3928 dirty.set((int) boundingRect.left, (int) boundingRect.top, 3929 (int) (boundingRect.right + 0.5f), 3930 (int) (boundingRect.bottom + 0.5f)); 3931 } 3932 } 3933 } while (parent != null); 3934 } 3935 } 3936 } 3937 3938 /** 3939 * Don't call or override this method. It is used for the implementation of 3940 * the view hierarchy. 3941 * 3942 * This implementation returns null if this ViewGroup does not have a parent, 3943 * if this ViewGroup is already fully invalidated or if the dirty rectangle 3944 * does not intersect with this ViewGroup's bounds. 3945 */ 3946 public ViewParent invalidateChildInParent(final int[] location, final Rect dirty) { 3947 if (ViewDebug.TRACE_HIERARCHY) { 3948 ViewDebug.trace(this, ViewDebug.HierarchyTraceType.INVALIDATE_CHILD_IN_PARENT); 3949 } 3950 3951 if ((mPrivateFlags & DRAWN) == DRAWN || 3952 (mPrivateFlags & DRAWING_CACHE_VALID) == DRAWING_CACHE_VALID) { 3953 if ((mGroupFlags & (FLAG_OPTIMIZE_INVALIDATE | FLAG_ANIMATION_DONE)) != 3954 FLAG_OPTIMIZE_INVALIDATE) { 3955 dirty.offset(location[CHILD_LEFT_INDEX] - mScrollX, 3956 location[CHILD_TOP_INDEX] - mScrollY); 3957 3958 final int left = mLeft; 3959 final int top = mTop; 3960 3961 if (dirty.intersect(0, 0, mRight - left, mBottom - top) || 3962 (mPrivateFlags & DRAW_ANIMATION) == DRAW_ANIMATION) { 3963 mPrivateFlags &= ~DRAWING_CACHE_VALID; 3964 3965 location[CHILD_LEFT_INDEX] = left; 3966 location[CHILD_TOP_INDEX] = top; 3967 3968 if (mLayerType != LAYER_TYPE_NONE) { 3969 mLocalDirtyRect.union(dirty); 3970 } 3971 3972 return mParent; 3973 } 3974 } else { 3975 mPrivateFlags &= ~DRAWN & ~DRAWING_CACHE_VALID; 3976 3977 location[CHILD_LEFT_INDEX] = mLeft; 3978 location[CHILD_TOP_INDEX] = mTop; 3979 3980 dirty.set(0, 0, mRight - mLeft, mBottom - mTop); 3981 3982 if (mLayerType != LAYER_TYPE_NONE) { 3983 mLocalDirtyRect.union(dirty); 3984 } 3985 3986 return mParent; 3987 } 3988 } 3989 3990 return null; 3991 } 3992 3993 /** 3994 * Offset a rectangle that is in a descendant's coordinate 3995 * space into our coordinate space. 3996 * @param descendant A descendant of this view 3997 * @param rect A rectangle defined in descendant's coordinate space. 3998 */ 3999 public final void offsetDescendantRectToMyCoords(View descendant, Rect rect) { 4000 offsetRectBetweenParentAndChild(descendant, rect, true, false); 4001 } 4002 4003 /** 4004 * Offset a rectangle that is in our coordinate space into an ancestor's 4005 * coordinate space. 4006 * @param descendant A descendant of this view 4007 * @param rect A rectangle defined in descendant's coordinate space. 4008 */ 4009 public final void offsetRectIntoDescendantCoords(View descendant, Rect rect) { 4010 offsetRectBetweenParentAndChild(descendant, rect, false, false); 4011 } 4012 4013 /** 4014 * Helper method that offsets a rect either from parent to descendant or 4015 * descendant to parent. 4016 */ 4017 void offsetRectBetweenParentAndChild(View descendant, Rect rect, 4018 boolean offsetFromChildToParent, boolean clipToBounds) { 4019 4020 // already in the same coord system :) 4021 if (descendant == this) { 4022 return; 4023 } 4024 4025 ViewParent theParent = descendant.mParent; 4026 4027 // search and offset up to the parent 4028 while ((theParent != null) 4029 && (theParent instanceof View) 4030 && (theParent != this)) { 4031 4032 if (offsetFromChildToParent) { 4033 rect.offset(descendant.mLeft - descendant.mScrollX, 4034 descendant.mTop - descendant.mScrollY); 4035 if (clipToBounds) { 4036 View p = (View) theParent; 4037 rect.intersect(0, 0, p.mRight - p.mLeft, p.mBottom - p.mTop); 4038 } 4039 } else { 4040 if (clipToBounds) { 4041 View p = (View) theParent; 4042 rect.intersect(0, 0, p.mRight - p.mLeft, p.mBottom - p.mTop); 4043 } 4044 rect.offset(descendant.mScrollX - descendant.mLeft, 4045 descendant.mScrollY - descendant.mTop); 4046 } 4047 4048 descendant = (View) theParent; 4049 theParent = descendant.mParent; 4050 } 4051 4052 // now that we are up to this view, need to offset one more time 4053 // to get into our coordinate space 4054 if (theParent == this) { 4055 if (offsetFromChildToParent) { 4056 rect.offset(descendant.mLeft - descendant.mScrollX, 4057 descendant.mTop - descendant.mScrollY); 4058 } else { 4059 rect.offset(descendant.mScrollX - descendant.mLeft, 4060 descendant.mScrollY - descendant.mTop); 4061 } 4062 } else { 4063 throw new IllegalArgumentException("parameter must be a descendant of this view"); 4064 } 4065 } 4066 4067 /** 4068 * Offset the vertical location of all children of this view by the specified number of pixels. 4069 * 4070 * @param offset the number of pixels to offset 4071 * 4072 * @hide 4073 */ 4074 public void offsetChildrenTopAndBottom(int offset) { 4075 final int count = mChildrenCount; 4076 final View[] children = mChildren; 4077 4078 for (int i = 0; i < count; i++) { 4079 final View v = children[i]; 4080 v.mTop += offset; 4081 v.mBottom += offset; 4082 } 4083 } 4084 4085 /** 4086 * {@inheritDoc} 4087 */ 4088 public boolean getChildVisibleRect(View child, Rect r, android.graphics.Point offset) { 4089 int dx = child.mLeft - mScrollX; 4090 int dy = child.mTop - mScrollY; 4091 if (offset != null) { 4092 offset.x += dx; 4093 offset.y += dy; 4094 } 4095 r.offset(dx, dy); 4096 return r.intersect(0, 0, mRight - mLeft, mBottom - mTop) && 4097 (mParent == null || mParent.getChildVisibleRect(this, r, offset)); 4098 } 4099 4100 /** 4101 * {@inheritDoc} 4102 */ 4103 @Override 4104 public final void layout(int l, int t, int r, int b) { 4105 if (mTransition == null || !mTransition.isChangingLayout()) { 4106 super.layout(l, t, r, b); 4107 } else { 4108 // record the fact that we noop'd it; request layout when transition finishes 4109 mLayoutSuppressed = true; 4110 } 4111 } 4112 4113 /** 4114 * {@inheritDoc} 4115 */ 4116 @Override 4117 protected abstract void onLayout(boolean changed, 4118 int l, int t, int r, int b); 4119 4120 /** 4121 * Indicates whether the view group has the ability to animate its children 4122 * after the first layout. 4123 * 4124 * @return true if the children can be animated, false otherwise 4125 */ 4126 protected boolean canAnimate() { 4127 return mLayoutAnimationController != null; 4128 } 4129 4130 /** 4131 * Runs the layout animation. Calling this method triggers a relayout of 4132 * this view group. 4133 */ 4134 public void startLayoutAnimation() { 4135 if (mLayoutAnimationController != null) { 4136 mGroupFlags |= FLAG_RUN_ANIMATION; 4137 requestLayout(); 4138 } 4139 } 4140 4141 /** 4142 * Schedules the layout animation to be played after the next layout pass 4143 * of this view group. This can be used to restart the layout animation 4144 * when the content of the view group changes or when the activity is 4145 * paused and resumed. 4146 */ 4147 public void scheduleLayoutAnimation() { 4148 mGroupFlags |= FLAG_RUN_ANIMATION; 4149 } 4150 4151 /** 4152 * Sets the layout animation controller used to animate the group's 4153 * children after the first layout. 4154 * 4155 * @param controller the animation controller 4156 */ 4157 public void setLayoutAnimation(LayoutAnimationController controller) { 4158 mLayoutAnimationController = controller; 4159 if (mLayoutAnimationController != null) { 4160 mGroupFlags |= FLAG_RUN_ANIMATION; 4161 } 4162 } 4163 4164 /** 4165 * Returns the layout animation controller used to animate the group's 4166 * children. 4167 * 4168 * @return the current animation controller 4169 */ 4170 public LayoutAnimationController getLayoutAnimation() { 4171 return mLayoutAnimationController; 4172 } 4173 4174 /** 4175 * Indicates whether the children's drawing cache is used during a layout 4176 * animation. By default, the drawing cache is enabled but this will prevent 4177 * nested layout animations from working. To nest animations, you must disable 4178 * the cache. 4179 * 4180 * @return true if the animation cache is enabled, false otherwise 4181 * 4182 * @see #setAnimationCacheEnabled(boolean) 4183 * @see View#setDrawingCacheEnabled(boolean) 4184 */ 4185 @ViewDebug.ExportedProperty 4186 public boolean isAnimationCacheEnabled() { 4187 return (mGroupFlags & FLAG_ANIMATION_CACHE) == FLAG_ANIMATION_CACHE; 4188 } 4189 4190 /** 4191 * Enables or disables the children's drawing cache during a layout animation. 4192 * By default, the drawing cache is enabled but this will prevent nested 4193 * layout animations from working. To nest animations, you must disable the 4194 * cache. 4195 * 4196 * @param enabled true to enable the animation cache, false otherwise 4197 * 4198 * @see #isAnimationCacheEnabled() 4199 * @see View#setDrawingCacheEnabled(boolean) 4200 */ 4201 public void setAnimationCacheEnabled(boolean enabled) { 4202 setBooleanFlag(FLAG_ANIMATION_CACHE, enabled); 4203 } 4204 4205 /** 4206 * Indicates whether this ViewGroup will always try to draw its children using their 4207 * drawing cache. By default this property is enabled. 4208 * 4209 * @return true if the animation cache is enabled, false otherwise 4210 * 4211 * @see #setAlwaysDrawnWithCacheEnabled(boolean) 4212 * @see #setChildrenDrawnWithCacheEnabled(boolean) 4213 * @see View#setDrawingCacheEnabled(boolean) 4214 */ 4215 @ViewDebug.ExportedProperty(category = "drawing") 4216 public boolean isAlwaysDrawnWithCacheEnabled() { 4217 return (mGroupFlags & FLAG_ALWAYS_DRAWN_WITH_CACHE) == FLAG_ALWAYS_DRAWN_WITH_CACHE; 4218 } 4219 4220 /** 4221 * Indicates whether this ViewGroup will always try to draw its children using their 4222 * drawing cache. This property can be set to true when the cache rendering is 4223 * slightly different from the children's normal rendering. Renderings can be different, 4224 * for instance, when the cache's quality is set to low. 4225 * 4226 * When this property is disabled, the ViewGroup will use the drawing cache of its 4227 * children only when asked to. It's usually the task of subclasses to tell ViewGroup 4228 * when to start using the drawing cache and when to stop using it. 4229 * 4230 * @param always true to always draw with the drawing cache, false otherwise 4231 * 4232 * @see #isAlwaysDrawnWithCacheEnabled() 4233 * @see #setChildrenDrawnWithCacheEnabled(boolean) 4234 * @see View#setDrawingCacheEnabled(boolean) 4235 * @see View#setDrawingCacheQuality(int) 4236 */ 4237 public void setAlwaysDrawnWithCacheEnabled(boolean always) { 4238 setBooleanFlag(FLAG_ALWAYS_DRAWN_WITH_CACHE, always); 4239 } 4240 4241 /** 4242 * Indicates whether the ViewGroup is currently drawing its children using 4243 * their drawing cache. 4244 * 4245 * @return true if children should be drawn with their cache, false otherwise 4246 * 4247 * @see #setAlwaysDrawnWithCacheEnabled(boolean) 4248 * @see #setChildrenDrawnWithCacheEnabled(boolean) 4249 */ 4250 @ViewDebug.ExportedProperty(category = "drawing") 4251 protected boolean isChildrenDrawnWithCacheEnabled() { 4252 return (mGroupFlags & FLAG_CHILDREN_DRAWN_WITH_CACHE) == FLAG_CHILDREN_DRAWN_WITH_CACHE; 4253 } 4254 4255 /** 4256 * Tells the ViewGroup to draw its children using their drawing cache. This property 4257 * is ignored when {@link #isAlwaysDrawnWithCacheEnabled()} is true. A child's drawing cache 4258 * will be used only if it has been enabled. 4259 * 4260 * Subclasses should call this method to start and stop using the drawing cache when 4261 * they perform performance sensitive operations, like scrolling or animating. 4262 * 4263 * @param enabled true if children should be drawn with their cache, false otherwise 4264 * 4265 * @see #setAlwaysDrawnWithCacheEnabled(boolean) 4266 * @see #isChildrenDrawnWithCacheEnabled() 4267 */ 4268 protected void setChildrenDrawnWithCacheEnabled(boolean enabled) { 4269 setBooleanFlag(FLAG_CHILDREN_DRAWN_WITH_CACHE, enabled); 4270 } 4271 4272 /** 4273 * Indicates whether the ViewGroup is drawing its children in the order defined by 4274 * {@link #getChildDrawingOrder(int, int)}. 4275 * 4276 * @return true if children drawing order is defined by {@link #getChildDrawingOrder(int, int)}, 4277 * false otherwise 4278 * 4279 * @see #setChildrenDrawingOrderEnabled(boolean) 4280 * @see #getChildDrawingOrder(int, int) 4281 */ 4282 @ViewDebug.ExportedProperty(category = "drawing") 4283 protected boolean isChildrenDrawingOrderEnabled() { 4284 return (mGroupFlags & FLAG_USE_CHILD_DRAWING_ORDER) == FLAG_USE_CHILD_DRAWING_ORDER; 4285 } 4286 4287 /** 4288 * Tells the ViewGroup whether to draw its children in the order defined by the method 4289 * {@link #getChildDrawingOrder(int, int)}. 4290 * 4291 * @param enabled true if the order of the children when drawing is determined by 4292 * {@link #getChildDrawingOrder(int, int)}, false otherwise 4293 * 4294 * @see #isChildrenDrawingOrderEnabled() 4295 * @see #getChildDrawingOrder(int, int) 4296 */ 4297 protected void setChildrenDrawingOrderEnabled(boolean enabled) { 4298 setBooleanFlag(FLAG_USE_CHILD_DRAWING_ORDER, enabled); 4299 } 4300 4301 private void setBooleanFlag(int flag, boolean value) { 4302 if (value) { 4303 mGroupFlags |= flag; 4304 } else { 4305 mGroupFlags &= ~flag; 4306 } 4307 } 4308 4309 /** 4310 * Returns an integer indicating what types of drawing caches are kept in memory. 4311 * 4312 * @see #setPersistentDrawingCache(int) 4313 * @see #setAnimationCacheEnabled(boolean) 4314 * 4315 * @return one or a combination of {@link #PERSISTENT_NO_CACHE}, 4316 * {@link #PERSISTENT_ANIMATION_CACHE}, {@link #PERSISTENT_SCROLLING_CACHE} 4317 * and {@link #PERSISTENT_ALL_CACHES} 4318 */ 4319 @ViewDebug.ExportedProperty(category = "drawing", mapping = { 4320 @ViewDebug.IntToString(from = PERSISTENT_NO_CACHE, to = "NONE"), 4321 @ViewDebug.IntToString(from = PERSISTENT_ANIMATION_CACHE, to = "ANIMATION"), 4322 @ViewDebug.IntToString(from = PERSISTENT_SCROLLING_CACHE, to = "SCROLLING"), 4323 @ViewDebug.IntToString(from = PERSISTENT_ALL_CACHES, to = "ALL") 4324 }) 4325 public int getPersistentDrawingCache() { 4326 return mPersistentDrawingCache; 4327 } 4328 4329 /** 4330 * Indicates what types of drawing caches should be kept in memory after 4331 * they have been created. 4332 * 4333 * @see #getPersistentDrawingCache() 4334 * @see #setAnimationCacheEnabled(boolean) 4335 * 4336 * @param drawingCacheToKeep one or a combination of {@link #PERSISTENT_NO_CACHE}, 4337 * {@link #PERSISTENT_ANIMATION_CACHE}, {@link #PERSISTENT_SCROLLING_CACHE} 4338 * and {@link #PERSISTENT_ALL_CACHES} 4339 */ 4340 public void setPersistentDrawingCache(int drawingCacheToKeep) { 4341 mPersistentDrawingCache = drawingCacheToKeep & PERSISTENT_ALL_CACHES; 4342 } 4343 4344 /** 4345 * Returns a new set of layout parameters based on the supplied attributes set. 4346 * 4347 * @param attrs the attributes to build the layout parameters from 4348 * 4349 * @return an instance of {@link android.view.ViewGroup.LayoutParams} or one 4350 * of its descendants 4351 */ 4352 public LayoutParams generateLayoutParams(AttributeSet attrs) { 4353 return new LayoutParams(getContext(), attrs); 4354 } 4355 4356 /** 4357 * Returns a safe set of layout parameters based on the supplied layout params. 4358 * When a ViewGroup is passed a View whose layout params do not pass the test of 4359 * {@link #checkLayoutParams(android.view.ViewGroup.LayoutParams)}, this method 4360 * is invoked. This method should return a new set of layout params suitable for 4361 * this ViewGroup, possibly by copying the appropriate attributes from the 4362 * specified set of layout params. 4363 * 4364 * @param p The layout parameters to convert into a suitable set of layout parameters 4365 * for this ViewGroup. 4366 * 4367 * @return an instance of {@link android.view.ViewGroup.LayoutParams} or one 4368 * of its descendants 4369 */ 4370 protected LayoutParams generateLayoutParams(ViewGroup.LayoutParams p) { 4371 return p; 4372 } 4373 4374 /** 4375 * Returns a set of default layout parameters. These parameters are requested 4376 * when the View passed to {@link #addView(View)} has no layout parameters 4377 * already set. If null is returned, an exception is thrown from addView. 4378 * 4379 * @return a set of default layout parameters or null 4380 */ 4381 protected LayoutParams generateDefaultLayoutParams() { 4382 return new LayoutParams(LayoutParams.WRAP_CONTENT, LayoutParams.WRAP_CONTENT); 4383 } 4384 4385 /** 4386 * @hide 4387 */ 4388 @Override 4389 protected boolean dispatchConsistencyCheck(int consistency) { 4390 boolean result = super.dispatchConsistencyCheck(consistency); 4391 4392 final int count = mChildrenCount; 4393 final View[] children = mChildren; 4394 for (int i = 0; i < count; i++) { 4395 if (!children[i].dispatchConsistencyCheck(consistency)) result = false; 4396 } 4397 4398 return result; 4399 } 4400 4401 /** 4402 * @hide 4403 */ 4404 @Override 4405 protected boolean onConsistencyCheck(int consistency) { 4406 boolean result = super.onConsistencyCheck(consistency); 4407 4408 final boolean checkLayout = (consistency & ViewDebug.CONSISTENCY_LAYOUT) != 0; 4409 final boolean checkDrawing = (consistency & ViewDebug.CONSISTENCY_DRAWING) != 0; 4410 4411 if (checkLayout) { 4412 final int count = mChildrenCount; 4413 final View[] children = mChildren; 4414 for (int i = 0; i < count; i++) { 4415 if (children[i].getParent() != this) { 4416 result = false; 4417 android.util.Log.d(ViewDebug.CONSISTENCY_LOG_TAG, 4418 "View " + children[i] + " has no parent/a parent that is not " + this); 4419 } 4420 } 4421 } 4422 4423 if (checkDrawing) { 4424 // If this group is dirty, check that the parent is dirty as well 4425 if ((mPrivateFlags & DIRTY_MASK) != 0) { 4426 final ViewParent parent = getParent(); 4427 if (parent != null && !(parent instanceof ViewAncestor)) { 4428 if ((((View) parent).mPrivateFlags & DIRTY_MASK) == 0) { 4429 result = false; 4430 android.util.Log.d(ViewDebug.CONSISTENCY_LOG_TAG, 4431 "ViewGroup " + this + " is dirty but its parent is not: " + this); 4432 } 4433 } 4434 } 4435 } 4436 4437 return result; 4438 } 4439 4440 /** 4441 * {@inheritDoc} 4442 */ 4443 @Override 4444 protected void debug(int depth) { 4445 super.debug(depth); 4446 String output; 4447 4448 if (mFocused != null) { 4449 output = debugIndent(depth); 4450 output += "mFocused"; 4451 Log.d(VIEW_LOG_TAG, output); 4452 } 4453 if (mChildrenCount != 0) { 4454 output = debugIndent(depth); 4455 output += "{"; 4456 Log.d(VIEW_LOG_TAG, output); 4457 } 4458 int count = mChildrenCount; 4459 for (int i = 0; i < count; i++) { 4460 View child = mChildren[i]; 4461 child.debug(depth + 1); 4462 } 4463 4464 if (mChildrenCount != 0) { 4465 output = debugIndent(depth); 4466 output += "}"; 4467 Log.d(VIEW_LOG_TAG, output); 4468 } 4469 } 4470 4471 /** 4472 * Returns the position in the group of the specified child view. 4473 * 4474 * @param child the view for which to get the position 4475 * @return a positive integer representing the position of the view in the 4476 * group, or -1 if the view does not exist in the group 4477 */ 4478 public int indexOfChild(View child) { 4479 final int count = mChildrenCount; 4480 final View[] children = mChildren; 4481 for (int i = 0; i < count; i++) { 4482 if (children[i] == child) { 4483 return i; 4484 } 4485 } 4486 return -1; 4487 } 4488 4489 /** 4490 * Returns the number of children in the group. 4491 * 4492 * @return a positive integer representing the number of children in 4493 * the group 4494 */ 4495 public int getChildCount() { 4496 return mChildrenCount; 4497 } 4498 4499 /** 4500 * Returns the view at the specified position in the group. 4501 * 4502 * @param index the position at which to get the view from 4503 * @return the view at the specified position or null if the position 4504 * does not exist within the group 4505 */ 4506 public View getChildAt(int index) { 4507 if (index < 0 || index >= mChildrenCount) { 4508 return null; 4509 } 4510 return mChildren[index]; 4511 } 4512 4513 /** 4514 * Ask all of the children of this view to measure themselves, taking into 4515 * account both the MeasureSpec requirements for this view and its padding. 4516 * We skip children that are in the GONE state The heavy lifting is done in 4517 * getChildMeasureSpec. 4518 * 4519 * @param widthMeasureSpec The width requirements for this view 4520 * @param heightMeasureSpec The height requirements for this view 4521 */ 4522 protected void measureChildren(int widthMeasureSpec, int heightMeasureSpec) { 4523 final int size = mChildrenCount; 4524 final View[] children = mChildren; 4525 for (int i = 0; i < size; ++i) { 4526 final View child = children[i]; 4527 if ((child.mViewFlags & VISIBILITY_MASK) != GONE) { 4528 measureChild(child, widthMeasureSpec, heightMeasureSpec); 4529 } 4530 } 4531 } 4532 4533 /** 4534 * Ask one of the children of this view to measure itself, taking into 4535 * account both the MeasureSpec requirements for this view and its padding. 4536 * The heavy lifting is done in getChildMeasureSpec. 4537 * 4538 * @param child The child to measure 4539 * @param parentWidthMeasureSpec The width requirements for this view 4540 * @param parentHeightMeasureSpec The height requirements for this view 4541 */ 4542 protected void measureChild(View child, int parentWidthMeasureSpec, 4543 int parentHeightMeasureSpec) { 4544 final LayoutParams lp = child.getLayoutParams(); 4545 4546 final int childWidthMeasureSpec = getChildMeasureSpec(parentWidthMeasureSpec, 4547 mPaddingLeft + mPaddingRight, lp.width); 4548 final int childHeightMeasureSpec = getChildMeasureSpec(parentHeightMeasureSpec, 4549 mPaddingTop + mPaddingBottom, lp.height); 4550 4551 child.measure(childWidthMeasureSpec, childHeightMeasureSpec); 4552 } 4553 4554 /** 4555 * Ask one of the children of this view to measure itself, taking into 4556 * account both the MeasureSpec requirements for this view and its padding 4557 * and margins. The child must have MarginLayoutParams The heavy lifting is 4558 * done in getChildMeasureSpec. 4559 * 4560 * @param child The child to measure 4561 * @param parentWidthMeasureSpec The width requirements for this view 4562 * @param widthUsed Extra space that has been used up by the parent 4563 * horizontally (possibly by other children of the parent) 4564 * @param parentHeightMeasureSpec The height requirements for this view 4565 * @param heightUsed Extra space that has been used up by the parent 4566 * vertically (possibly by other children of the parent) 4567 */ 4568 protected void measureChildWithMargins(View child, 4569 int parentWidthMeasureSpec, int widthUsed, 4570 int parentHeightMeasureSpec, int heightUsed) { 4571 final MarginLayoutParams lp = (MarginLayoutParams) child.getLayoutParams(); 4572 4573 final int childWidthMeasureSpec = getChildMeasureSpec(parentWidthMeasureSpec, 4574 mPaddingLeft + mPaddingRight + lp.leftMargin + lp.rightMargin 4575 + widthUsed, lp.width); 4576 final int childHeightMeasureSpec = getChildMeasureSpec(parentHeightMeasureSpec, 4577 mPaddingTop + mPaddingBottom + lp.topMargin + lp.bottomMargin 4578 + heightUsed, lp.height); 4579 4580 child.measure(childWidthMeasureSpec, childHeightMeasureSpec); 4581 } 4582 4583 /** 4584 * Does the hard part of measureChildren: figuring out the MeasureSpec to 4585 * pass to a particular child. This method figures out the right MeasureSpec 4586 * for one dimension (height or width) of one child view. 4587 * 4588 * The goal is to combine information from our MeasureSpec with the 4589 * LayoutParams of the child to get the best possible results. For example, 4590 * if the this view knows its size (because its MeasureSpec has a mode of 4591 * EXACTLY), and the child has indicated in its LayoutParams that it wants 4592 * to be the same size as the parent, the parent should ask the child to 4593 * layout given an exact size. 4594 * 4595 * @param spec The requirements for this view 4596 * @param padding The padding of this view for the current dimension and 4597 * margins, if applicable 4598 * @param childDimension How big the child wants to be in the current 4599 * dimension 4600 * @return a MeasureSpec integer for the child 4601 */ 4602 public static int getChildMeasureSpec(int spec, int padding, int childDimension) { 4603 int specMode = MeasureSpec.getMode(spec); 4604 int specSize = MeasureSpec.getSize(spec); 4605 4606 int size = Math.max(0, specSize - padding); 4607 4608 int resultSize = 0; 4609 int resultMode = 0; 4610 4611 switch (specMode) { 4612 // Parent has imposed an exact size on us 4613 case MeasureSpec.EXACTLY: 4614 if (childDimension >= 0) { 4615 resultSize = childDimension; 4616 resultMode = MeasureSpec.EXACTLY; 4617 } else if (childDimension == LayoutParams.MATCH_PARENT) { 4618 // Child wants to be our size. So be it. 4619 resultSize = size; 4620 resultMode = MeasureSpec.EXACTLY; 4621 } else if (childDimension == LayoutParams.WRAP_CONTENT) { 4622 // Child wants to determine its own size. It can't be 4623 // bigger than us. 4624 resultSize = size; 4625 resultMode = MeasureSpec.AT_MOST; 4626 } 4627 break; 4628 4629 // Parent has imposed a maximum size on us 4630 case MeasureSpec.AT_MOST: 4631 if (childDimension >= 0) { 4632 // Child wants a specific size... so be it 4633 resultSize = childDimension; 4634 resultMode = MeasureSpec.EXACTLY; 4635 } else if (childDimension == LayoutParams.MATCH_PARENT) { 4636 // Child wants to be our size, but our size is not fixed. 4637 // Constrain child to not be bigger than us. 4638 resultSize = size; 4639 resultMode = MeasureSpec.AT_MOST; 4640 } else if (childDimension == LayoutParams.WRAP_CONTENT) { 4641 // Child wants to determine its own size. It can't be 4642 // bigger than us. 4643 resultSize = size; 4644 resultMode = MeasureSpec.AT_MOST; 4645 } 4646 break; 4647 4648 // Parent asked to see how big we want to be 4649 case MeasureSpec.UNSPECIFIED: 4650 if (childDimension >= 0) { 4651 // Child wants a specific size... let him have it 4652 resultSize = childDimension; 4653 resultMode = MeasureSpec.EXACTLY; 4654 } else if (childDimension == LayoutParams.MATCH_PARENT) { 4655 // Child wants to be our size... find out how big it should 4656 // be 4657 resultSize = 0; 4658 resultMode = MeasureSpec.UNSPECIFIED; 4659 } else if (childDimension == LayoutParams.WRAP_CONTENT) { 4660 // Child wants to determine its own size.... find out how 4661 // big it should be 4662 resultSize = 0; 4663 resultMode = MeasureSpec.UNSPECIFIED; 4664 } 4665 break; 4666 } 4667 return MeasureSpec.makeMeasureSpec(resultSize, resultMode); 4668 } 4669 4670 4671 /** 4672 * Removes any pending animations for views that have been removed. Call 4673 * this if you don't want animations for exiting views to stack up. 4674 */ 4675 public void clearDisappearingChildren() { 4676 if (mDisappearingChildren != null) { 4677 mDisappearingChildren.clear(); 4678 } 4679 } 4680 4681 /** 4682 * Add a view which is removed from mChildren but still needs animation 4683 * 4684 * @param v View to add 4685 */ 4686 private void addDisappearingView(View v) { 4687 ArrayList<View> disappearingChildren = mDisappearingChildren; 4688 4689 if (disappearingChildren == null) { 4690 disappearingChildren = mDisappearingChildren = new ArrayList<View>(); 4691 } 4692 4693 disappearingChildren.add(v); 4694 } 4695 4696 /** 4697 * Cleanup a view when its animation is done. This may mean removing it from 4698 * the list of disappearing views. 4699 * 4700 * @param view The view whose animation has finished 4701 * @param animation The animation, cannot be null 4702 */ 4703 private void finishAnimatingView(final View view, Animation animation) { 4704 final ArrayList<View> disappearingChildren = mDisappearingChildren; 4705 if (disappearingChildren != null) { 4706 if (disappearingChildren.contains(view)) { 4707 disappearingChildren.remove(view); 4708 4709 if (view.mAttachInfo != null) { 4710 view.dispatchDetachedFromWindow(); 4711 } 4712 4713 view.clearAnimation(); 4714 mGroupFlags |= FLAG_INVALIDATE_REQUIRED; 4715 } 4716 } 4717 4718 if (animation != null && !animation.getFillAfter()) { 4719 view.clearAnimation(); 4720 } 4721 4722 if ((view.mPrivateFlags & ANIMATION_STARTED) == ANIMATION_STARTED) { 4723 view.onAnimationEnd(); 4724 // Should be performed by onAnimationEnd() but this avoid an infinite loop, 4725 // so we'd rather be safe than sorry 4726 view.mPrivateFlags &= ~ANIMATION_STARTED; 4727 // Draw one more frame after the animation is done 4728 mGroupFlags |= FLAG_INVALIDATE_REQUIRED; 4729 } 4730 } 4731 4732 /** 4733 * This method tells the ViewGroup that the given View object, which should have this 4734 * ViewGroup as its parent, 4735 * should be kept around (re-displayed when the ViewGroup draws its children) even if it 4736 * is removed from its parent. This allows animations, such as those used by 4737 * {@link android.app.Fragment} and {@link android.animation.LayoutTransition} to animate 4738 * the removal of views. A call to this method should always be accompanied by a later call 4739 * to {@link #endViewTransition(View)}, such as after an animation on the View has finished, 4740 * so that the View finally gets removed. 4741 * 4742 * @param view The View object to be kept visible even if it gets removed from its parent. 4743 */ 4744 public void startViewTransition(View view) { 4745 if (view.mParent == this) { 4746 if (mTransitioningViews == null) { 4747 mTransitioningViews = new ArrayList<View>(); 4748 } 4749 mTransitioningViews.add(view); 4750 } 4751 } 4752 4753 /** 4754 * This method should always be called following an earlier call to 4755 * {@link #startViewTransition(View)}. The given View is finally removed from its parent 4756 * and will no longer be displayed. Note that this method does not perform the functionality 4757 * of removing a view from its parent; it just discontinues the display of a View that 4758 * has previously been removed. 4759 * 4760 * @return view The View object that has been removed but is being kept around in the visible 4761 * hierarchy by an earlier call to {@link #startViewTransition(View)}. 4762 */ 4763 public void endViewTransition(View view) { 4764 if (mTransitioningViews != null) { 4765 mTransitioningViews.remove(view); 4766 final ArrayList<View> disappearingChildren = mDisappearingChildren; 4767 if (disappearingChildren != null && disappearingChildren.contains(view)) { 4768 disappearingChildren.remove(view); 4769 if (mVisibilityChangingChildren != null && 4770 mVisibilityChangingChildren.contains(view)) { 4771 mVisibilityChangingChildren.remove(view); 4772 } else { 4773 if (view.mAttachInfo != null) { 4774 view.dispatchDetachedFromWindow(); 4775 } 4776 if (view.mParent != null) { 4777 view.mParent = null; 4778 } 4779 } 4780 mGroupFlags |= FLAG_INVALIDATE_REQUIRED; 4781 } 4782 } 4783 } 4784 4785 private LayoutTransition.TransitionListener mLayoutTransitionListener = 4786 new LayoutTransition.TransitionListener() { 4787 @Override 4788 public void startTransition(LayoutTransition transition, ViewGroup container, 4789 View view, int transitionType) { 4790 // We only care about disappearing items, since we need special logic to keep 4791 // those items visible after they've been 'removed' 4792 if (transitionType == LayoutTransition.DISAPPEARING) { 4793 startViewTransition(view); 4794 } 4795 } 4796 4797 @Override 4798 public void endTransition(LayoutTransition transition, ViewGroup container, 4799 View view, int transitionType) { 4800 if (mLayoutSuppressed && !transition.isChangingLayout()) { 4801 requestLayout(); 4802 mLayoutSuppressed = false; 4803 } 4804 if (transitionType == LayoutTransition.DISAPPEARING && mTransitioningViews != null) { 4805 endViewTransition(view); 4806 } 4807 } 4808 }; 4809 4810 /** 4811 * {@inheritDoc} 4812 */ 4813 @Override 4814 public boolean gatherTransparentRegion(Region region) { 4815 // If no transparent regions requested, we are always opaque. 4816 final boolean meOpaque = (mPrivateFlags & View.REQUEST_TRANSPARENT_REGIONS) == 0; 4817 if (meOpaque && region == null) { 4818 // The caller doesn't care about the region, so stop now. 4819 return true; 4820 } 4821 super.gatherTransparentRegion(region); 4822 final View[] children = mChildren; 4823 final int count = mChildrenCount; 4824 boolean noneOfTheChildrenAreTransparent = true; 4825 for (int i = 0; i < count; i++) { 4826 final View child = children[i]; 4827 if ((child.mViewFlags & VISIBILITY_MASK) == VISIBLE || child.getAnimation() != null) { 4828 if (!child.gatherTransparentRegion(region)) { 4829 noneOfTheChildrenAreTransparent = false; 4830 } 4831 } 4832 } 4833 return meOpaque || noneOfTheChildrenAreTransparent; 4834 } 4835 4836 /** 4837 * {@inheritDoc} 4838 */ 4839 public void requestTransparentRegion(View child) { 4840 if (child != null) { 4841 child.mPrivateFlags |= View.REQUEST_TRANSPARENT_REGIONS; 4842 if (mParent != null) { 4843 mParent.requestTransparentRegion(this); 4844 } 4845 } 4846 } 4847 4848 4849 @Override 4850 protected boolean fitSystemWindows(Rect insets) { 4851 boolean done = super.fitSystemWindows(insets); 4852 if (!done) { 4853 final int count = mChildrenCount; 4854 final View[] children = mChildren; 4855 for (int i = 0; i < count; i++) { 4856 done = children[i].fitSystemWindows(insets); 4857 if (done) { 4858 break; 4859 } 4860 } 4861 } 4862 return done; 4863 } 4864 4865 /** 4866 * Returns the animation listener to which layout animation events are 4867 * sent. 4868 * 4869 * @return an {@link android.view.animation.Animation.AnimationListener} 4870 */ 4871 public Animation.AnimationListener getLayoutAnimationListener() { 4872 return mAnimationListener; 4873 } 4874 4875 @Override 4876 protected void drawableStateChanged() { 4877 super.drawableStateChanged(); 4878 4879 if ((mGroupFlags & FLAG_NOTIFY_CHILDREN_ON_DRAWABLE_STATE_CHANGE) != 0) { 4880 if ((mGroupFlags & FLAG_ADD_STATES_FROM_CHILDREN) != 0) { 4881 throw new IllegalStateException("addStateFromChildren cannot be enabled if a" 4882 + " child has duplicateParentState set to true"); 4883 } 4884 4885 final View[] children = mChildren; 4886 final int count = mChildrenCount; 4887 4888 for (int i = 0; i < count; i++) { 4889 final View child = children[i]; 4890 if ((child.mViewFlags & DUPLICATE_PARENT_STATE) != 0) { 4891 child.refreshDrawableState(); 4892 } 4893 } 4894 } 4895 } 4896 4897 @Override 4898 public void jumpDrawablesToCurrentState() { 4899 super.jumpDrawablesToCurrentState(); 4900 final View[] children = mChildren; 4901 final int count = mChildrenCount; 4902 for (int i = 0; i < count; i++) { 4903 children[i].jumpDrawablesToCurrentState(); 4904 } 4905 } 4906 4907 @Override 4908 protected int[] onCreateDrawableState(int extraSpace) { 4909 if ((mGroupFlags & FLAG_ADD_STATES_FROM_CHILDREN) == 0) { 4910 return super.onCreateDrawableState(extraSpace); 4911 } 4912 4913 int need = 0; 4914 int n = getChildCount(); 4915 for (int i = 0; i < n; i++) { 4916 int[] childState = getChildAt(i).getDrawableState(); 4917 4918 if (childState != null) { 4919 need += childState.length; 4920 } 4921 } 4922 4923 int[] state = super.onCreateDrawableState(extraSpace + need); 4924 4925 for (int i = 0; i < n; i++) { 4926 int[] childState = getChildAt(i).getDrawableState(); 4927 4928 if (childState != null) { 4929 state = mergeDrawableStates(state, childState); 4930 } 4931 } 4932 4933 return state; 4934 } 4935 4936 /** 4937 * Sets whether this ViewGroup's drawable states also include 4938 * its children's drawable states. This is used, for example, to 4939 * make a group appear to be focused when its child EditText or button 4940 * is focused. 4941 */ 4942 public void setAddStatesFromChildren(boolean addsStates) { 4943 if (addsStates) { 4944 mGroupFlags |= FLAG_ADD_STATES_FROM_CHILDREN; 4945 } else { 4946 mGroupFlags &= ~FLAG_ADD_STATES_FROM_CHILDREN; 4947 } 4948 4949 refreshDrawableState(); 4950 } 4951 4952 /** 4953 * Returns whether this ViewGroup's drawable states also include 4954 * its children's drawable states. This is used, for example, to 4955 * make a group appear to be focused when its child EditText or button 4956 * is focused. 4957 */ 4958 public boolean addStatesFromChildren() { 4959 return (mGroupFlags & FLAG_ADD_STATES_FROM_CHILDREN) != 0; 4960 } 4961 4962 /** 4963 * If {link #addStatesFromChildren} is true, refreshes this group's 4964 * drawable state (to include the states from its children). 4965 */ 4966 public void childDrawableStateChanged(View child) { 4967 if ((mGroupFlags & FLAG_ADD_STATES_FROM_CHILDREN) != 0) { 4968 refreshDrawableState(); 4969 } 4970 } 4971 4972 /** 4973 * Specifies the animation listener to which layout animation events must 4974 * be sent. Only 4975 * {@link android.view.animation.Animation.AnimationListener#onAnimationStart(Animation)} 4976 * and 4977 * {@link android.view.animation.Animation.AnimationListener#onAnimationEnd(Animation)} 4978 * are invoked. 4979 * 4980 * @param animationListener the layout animation listener 4981 */ 4982 public void setLayoutAnimationListener(Animation.AnimationListener animationListener) { 4983 mAnimationListener = animationListener; 4984 } 4985 4986 /** 4987 * This method is called by LayoutTransition when there are 'changing' animations that need 4988 * to start after the layout/setup phase. The request is forwarded to the ViewAncestor, who 4989 * starts all pending transitions prior to the drawing phase in the current traversal. 4990 * 4991 * @param transition The LayoutTransition to be started on the next traversal. 4992 * 4993 * @hide 4994 */ 4995 public void requestTransitionStart(LayoutTransition transition) { 4996 ViewAncestor viewAncestor = getViewAncestor(); 4997 viewAncestor.requestTransitionStart(transition); 4998 } 4999 5000 /** 5001 * This method will be called when we need to reset the layout direction resolution flag 5002 * 5003 */ 5004 @Override 5005 void resetLayoutDirectionResolution() { 5006 super.resetLayoutDirectionResolution(); 5007 5008 // Take care of resetting the children resolution too 5009 final int count = getChildCount(); 5010 for (int i = 0; i < count; i++) { 5011 final View child = getChildAt(i); 5012 if (child.getLayoutDirection() == LAYOUT_DIRECTION_INHERIT) { 5013 child.resetLayoutDirectionResolution(); 5014 } 5015 } 5016 } 5017 5018 /** 5019 * Return true if the pressed state should be delayed for children or descendants of this 5020 * ViewGroup. Generally, this should be done for containers that can scroll, such as a List. 5021 * This prevents the pressed state from appearing when the user is actually trying to scroll 5022 * the content. 5023 * 5024 * The default implementation returns true for compatibility reasons. Subclasses that do 5025 * not scroll should generally override this method and return false. 5026 */ 5027 public boolean shouldDelayChildPressedState() { 5028 return true; 5029 } 5030 5031 /** 5032 * LayoutParams are used by views to tell their parents how they want to be 5033 * laid out. See 5034 * {@link android.R.styleable#ViewGroup_Layout ViewGroup Layout Attributes} 5035 * for a list of all child view attributes that this class supports. 5036 * 5037 * <p> 5038 * The base LayoutParams class just describes how big the view wants to be 5039 * for both width and height. For each dimension, it can specify one of: 5040 * <ul> 5041 * <li>FILL_PARENT (renamed MATCH_PARENT in API Level 8 and higher), which 5042 * means that the view wants to be as big as its parent (minus padding) 5043 * <li> WRAP_CONTENT, which means that the view wants to be just big enough 5044 * to enclose its content (plus padding) 5045 * <li> an exact number 5046 * </ul> 5047 * There are subclasses of LayoutParams for different subclasses of 5048 * ViewGroup. For example, AbsoluteLayout has its own subclass of 5049 * LayoutParams which adds an X and Y value. 5050 * 5051 * @attr ref android.R.styleable#ViewGroup_Layout_layout_height 5052 * @attr ref android.R.styleable#ViewGroup_Layout_layout_width 5053 */ 5054 public static class LayoutParams { 5055 /** 5056 * Special value for the height or width requested by a View. 5057 * FILL_PARENT means that the view wants to be as big as its parent, 5058 * minus the parent's padding, if any. This value is deprecated 5059 * starting in API Level 8 and replaced by {@link #MATCH_PARENT}. 5060 */ 5061 @SuppressWarnings({"UnusedDeclaration"}) 5062 @Deprecated 5063 public static final int FILL_PARENT = -1; 5064 5065 /** 5066 * Special value for the height or width requested by a View. 5067 * MATCH_PARENT means that the view wants to be as big as its parent, 5068 * minus the parent's padding, if any. Introduced in API Level 8. 5069 */ 5070 public static final int MATCH_PARENT = -1; 5071 5072 /** 5073 * Special value for the height or width requested by a View. 5074 * WRAP_CONTENT means that the view wants to be just large enough to fit 5075 * its own internal content, taking its own padding into account. 5076 */ 5077 public static final int WRAP_CONTENT = -2; 5078 5079 /** 5080 * Information about how wide the view wants to be. Can be one of the 5081 * constants FILL_PARENT (replaced by MATCH_PARENT , 5082 * in API Level 8) or WRAP_CONTENT. or an exact size. 5083 */ 5084 @ViewDebug.ExportedProperty(category = "layout", mapping = { 5085 @ViewDebug.IntToString(from = MATCH_PARENT, to = "MATCH_PARENT"), 5086 @ViewDebug.IntToString(from = WRAP_CONTENT, to = "WRAP_CONTENT") 5087 }) 5088 public int width; 5089 5090 /** 5091 * Information about how tall the view wants to be. Can be one of the 5092 * constants FILL_PARENT (replaced by MATCH_PARENT , 5093 * in API Level 8) or WRAP_CONTENT. or an exact size. 5094 */ 5095 @ViewDebug.ExportedProperty(category = "layout", mapping = { 5096 @ViewDebug.IntToString(from = MATCH_PARENT, to = "MATCH_PARENT"), 5097 @ViewDebug.IntToString(from = WRAP_CONTENT, to = "WRAP_CONTENT") 5098 }) 5099 public int height; 5100 5101 /** 5102 * Used to animate layouts. 5103 */ 5104 public LayoutAnimationController.AnimationParameters layoutAnimationParameters; 5105 5106 /** 5107 * Creates a new set of layout parameters. The values are extracted from 5108 * the supplied attributes set and context. The XML attributes mapped 5109 * to this set of layout parameters are: 5110 * 5111 * <ul> 5112 * <li><code>layout_width</code>: the width, either an exact value, 5113 * {@link #WRAP_CONTENT}, or {@link #FILL_PARENT} (replaced by 5114 * {@link #MATCH_PARENT} in API Level 8)</li> 5115 * <li><code>layout_height</code>: the height, either an exact value, 5116 * {@link #WRAP_CONTENT}, or {@link #FILL_PARENT} (replaced by 5117 * {@link #MATCH_PARENT} in API Level 8)</li> 5118 * </ul> 5119 * 5120 * @param c the application environment 5121 * @param attrs the set of attributes from which to extract the layout 5122 * parameters' values 5123 */ 5124 public LayoutParams(Context c, AttributeSet attrs) { 5125 TypedArray a = c.obtainStyledAttributes(attrs, R.styleable.ViewGroup_Layout); 5126 setBaseAttributes(a, 5127 R.styleable.ViewGroup_Layout_layout_width, 5128 R.styleable.ViewGroup_Layout_layout_height); 5129 a.recycle(); 5130 } 5131 5132 /** 5133 * Creates a new set of layout parameters with the specified width 5134 * and height. 5135 * 5136 * @param width the width, either {@link #WRAP_CONTENT}, 5137 * {@link #FILL_PARENT} (replaced by {@link #MATCH_PARENT} in 5138 * API Level 8), or a fixed size in pixels 5139 * @param height the height, either {@link #WRAP_CONTENT}, 5140 * {@link #FILL_PARENT} (replaced by {@link #MATCH_PARENT} in 5141 * API Level 8), or a fixed size in pixels 5142 */ 5143 public LayoutParams(int width, int height) { 5144 this.width = width; 5145 this.height = height; 5146 } 5147 5148 /** 5149 * Copy constructor. Clones the width and height values of the source. 5150 * 5151 * @param source The layout params to copy from. 5152 */ 5153 public LayoutParams(LayoutParams source) { 5154 this.width = source.width; 5155 this.height = source.height; 5156 } 5157 5158 /** 5159 * Used internally by MarginLayoutParams. 5160 * @hide 5161 */ 5162 LayoutParams() { 5163 } 5164 5165 /** 5166 * Extracts the layout parameters from the supplied attributes. 5167 * 5168 * @param a the style attributes to extract the parameters from 5169 * @param widthAttr the identifier of the width attribute 5170 * @param heightAttr the identifier of the height attribute 5171 */ 5172 protected void setBaseAttributes(TypedArray a, int widthAttr, int heightAttr) { 5173 width = a.getLayoutDimension(widthAttr, "layout_width"); 5174 height = a.getLayoutDimension(heightAttr, "layout_height"); 5175 } 5176 5177 /** 5178 * Returns a String representation of this set of layout parameters. 5179 * 5180 * @param output the String to prepend to the internal representation 5181 * @return a String with the following format: output + 5182 * "ViewGroup.LayoutParams={ width=WIDTH, height=HEIGHT }" 5183 * 5184 * @hide 5185 */ 5186 public String debug(String output) { 5187 return output + "ViewGroup.LayoutParams={ width=" 5188 + sizeToString(width) + ", height=" + sizeToString(height) + " }"; 5189 } 5190 5191 /** 5192 * Converts the specified size to a readable String. 5193 * 5194 * @param size the size to convert 5195 * @return a String instance representing the supplied size 5196 * 5197 * @hide 5198 */ 5199 protected static String sizeToString(int size) { 5200 if (size == WRAP_CONTENT) { 5201 return "wrap-content"; 5202 } 5203 if (size == MATCH_PARENT) { 5204 return "match-parent"; 5205 } 5206 return String.valueOf(size); 5207 } 5208 } 5209 5210 /** 5211 * Per-child layout information for layouts that support margins. 5212 * See 5213 * {@link android.R.styleable#ViewGroup_MarginLayout ViewGroup Margin Layout Attributes} 5214 * for a list of all child view attributes that this class supports. 5215 */ 5216 public static class MarginLayoutParams extends ViewGroup.LayoutParams { 5217 /** 5218 * The left margin in pixels of the child. 5219 */ 5220 @ViewDebug.ExportedProperty(category = "layout") 5221 public int leftMargin; 5222 5223 /** 5224 * The top margin in pixels of the child. 5225 */ 5226 @ViewDebug.ExportedProperty(category = "layout") 5227 public int topMargin; 5228 5229 /** 5230 * The right margin in pixels of the child. 5231 */ 5232 @ViewDebug.ExportedProperty(category = "layout") 5233 public int rightMargin; 5234 5235 /** 5236 * The bottom margin in pixels of the child. 5237 */ 5238 @ViewDebug.ExportedProperty(category = "layout") 5239 public int bottomMargin; 5240 5241 /** 5242 * Creates a new set of layout parameters. The values are extracted from 5243 * the supplied attributes set and context. 5244 * 5245 * @param c the application environment 5246 * @param attrs the set of attributes from which to extract the layout 5247 * parameters' values 5248 */ 5249 public MarginLayoutParams(Context c, AttributeSet attrs) { 5250 super(); 5251 5252 TypedArray a = c.obtainStyledAttributes(attrs, R.styleable.ViewGroup_MarginLayout); 5253 setBaseAttributes(a, 5254 R.styleable.ViewGroup_MarginLayout_layout_width, 5255 R.styleable.ViewGroup_MarginLayout_layout_height); 5256 5257 int margin = a.getDimensionPixelSize( 5258 com.android.internal.R.styleable.ViewGroup_MarginLayout_layout_margin, -1); 5259 if (margin >= 0) { 5260 leftMargin = margin; 5261 topMargin = margin; 5262 rightMargin= margin; 5263 bottomMargin = margin; 5264 } else { 5265 leftMargin = a.getDimensionPixelSize( 5266 R.styleable.ViewGroup_MarginLayout_layout_marginLeft, 0); 5267 topMargin = a.getDimensionPixelSize( 5268 R.styleable.ViewGroup_MarginLayout_layout_marginTop, 0); 5269 rightMargin = a.getDimensionPixelSize( 5270 R.styleable.ViewGroup_MarginLayout_layout_marginRight, 0); 5271 bottomMargin = a.getDimensionPixelSize( 5272 R.styleable.ViewGroup_MarginLayout_layout_marginBottom, 0); 5273 } 5274 5275 a.recycle(); 5276 } 5277 5278 /** 5279 * {@inheritDoc} 5280 */ 5281 public MarginLayoutParams(int width, int height) { 5282 super(width, height); 5283 } 5284 5285 /** 5286 * Copy constructor. Clones the width, height and margin values of the source. 5287 * 5288 * @param source The layout params to copy from. 5289 */ 5290 public MarginLayoutParams(MarginLayoutParams source) { 5291 this.width = source.width; 5292 this.height = source.height; 5293 5294 this.leftMargin = source.leftMargin; 5295 this.topMargin = source.topMargin; 5296 this.rightMargin = source.rightMargin; 5297 this.bottomMargin = source.bottomMargin; 5298 } 5299 5300 /** 5301 * {@inheritDoc} 5302 */ 5303 public MarginLayoutParams(LayoutParams source) { 5304 super(source); 5305 } 5306 5307 /** 5308 * Sets the margins, in pixels. 5309 * 5310 * @param left the left margin size 5311 * @param top the top margin size 5312 * @param right the right margin size 5313 * @param bottom the bottom margin size 5314 * 5315 * @attr ref android.R.styleable#ViewGroup_MarginLayout_layout_marginLeft 5316 * @attr ref android.R.styleable#ViewGroup_MarginLayout_layout_marginTop 5317 * @attr ref android.R.styleable#ViewGroup_MarginLayout_layout_marginRight 5318 * @attr ref android.R.styleable#ViewGroup_MarginLayout_layout_marginBottom 5319 */ 5320 public void setMargins(int left, int top, int right, int bottom) { 5321 leftMargin = left; 5322 topMargin = top; 5323 rightMargin = right; 5324 bottomMargin = bottom; 5325 } 5326 } 5327 5328 /* Describes a touched view and the ids of the pointers that it has captured. 5329 * 5330 * This code assumes that pointer ids are always in the range 0..31 such that 5331 * it can use a bitfield to track which pointer ids are present. 5332 * As it happens, the lower layers of the input dispatch pipeline also use the 5333 * same trick so the assumption should be safe here... 5334 */ 5335 private static final class TouchTarget { 5336 private static final int MAX_RECYCLED = 32; 5337 private static final Object sRecycleLock = new Object(); 5338 private static TouchTarget sRecycleBin; 5339 private static int sRecycledCount; 5340 5341 public static final int ALL_POINTER_IDS = -1; // all ones 5342 5343 // The touched child view. 5344 public View child; 5345 5346 // The combined bit mask of pointer ids for all pointers captured by the target. 5347 public int pointerIdBits; 5348 5349 // The next target in the target list. 5350 public TouchTarget next; 5351 5352 private TouchTarget() { 5353 } 5354 5355 public static TouchTarget obtain(View child, int pointerIdBits) { 5356 final TouchTarget target; 5357 synchronized (sRecycleLock) { 5358 if (sRecycleBin == null) { 5359 target = new TouchTarget(); 5360 } else { 5361 target = sRecycleBin; 5362 sRecycleBin = target.next; 5363 sRecycledCount--; 5364 target.next = null; 5365 } 5366 } 5367 target.child = child; 5368 target.pointerIdBits = pointerIdBits; 5369 return target; 5370 } 5371 5372 public void recycle() { 5373 synchronized (sRecycleLock) { 5374 if (sRecycledCount < MAX_RECYCLED) { 5375 next = sRecycleBin; 5376 sRecycleBin = this; 5377 sRecycledCount += 1; 5378 } else { 5379 next = null; 5380 } 5381 child = null; 5382 } 5383 } 5384 } 5385 5386 /* Describes a hovered view. */ 5387 private static final class HoverTarget { 5388 private static final int MAX_RECYCLED = 32; 5389 private static final Object sRecycleLock = new Object(); 5390 private static HoverTarget sRecycleBin; 5391 private static int sRecycledCount; 5392 5393 // The hovered child view. 5394 public View child; 5395 5396 // The next target in the target list. 5397 public HoverTarget next; 5398 5399 private HoverTarget() { 5400 } 5401 5402 public static HoverTarget obtain(View child) { 5403 final HoverTarget target; 5404 synchronized (sRecycleLock) { 5405 if (sRecycleBin == null) { 5406 target = new HoverTarget(); 5407 } else { 5408 target = sRecycleBin; 5409 sRecycleBin = target.next; 5410 sRecycledCount--; 5411 target.next = null; 5412 } 5413 } 5414 target.child = child; 5415 return target; 5416 } 5417 5418 public void recycle() { 5419 synchronized (sRecycleLock) { 5420 if (sRecycledCount < MAX_RECYCLED) { 5421 next = sRecycleBin; 5422 sRecycleBin = this; 5423 sRecycledCount += 1; 5424 } else { 5425 next = null; 5426 } 5427 child = null; 5428 } 5429 } 5430 } 5431} 5432