ViewGroup.java revision 031d9c1389de2b9dac7f175af0b962e24b21d5be
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.View.AccessibilityDelegate; 38import android.view.accessibility.AccessibilityEvent; 39import android.view.accessibility.AccessibilityNodeInfo; 40import android.view.animation.Animation; 41import android.view.animation.AnimationUtils; 42import android.view.animation.LayoutAnimationController; 43import android.view.animation.Transformation; 44 45import com.android.internal.R; 46import com.android.internal.util.Predicate; 47 48import java.util.ArrayList; 49import java.util.HashSet; 50 51/** 52 * <p> 53 * A <code>ViewGroup</code> is a special view that can contain other views 54 * (called children.) The view group is the base class for layouts and views 55 * containers. This class also defines the 56 * {@link android.view.ViewGroup.LayoutParams} class which serves as the base 57 * class for layouts parameters. 58 * </p> 59 * 60 * <p> 61 * Also see {@link LayoutParams} for layout attributes. 62 * </p> 63 * 64 * @attr ref android.R.styleable#ViewGroup_clipChildren 65 * @attr ref android.R.styleable#ViewGroup_clipToPadding 66 * @attr ref android.R.styleable#ViewGroup_layoutAnimation 67 * @attr ref android.R.styleable#ViewGroup_animationCache 68 * @attr ref android.R.styleable#ViewGroup_persistentDrawingCache 69 * @attr ref android.R.styleable#ViewGroup_alwaysDrawnWithCache 70 * @attr ref android.R.styleable#ViewGroup_addStatesFromChildren 71 * @attr ref android.R.styleable#ViewGroup_descendantFocusability 72 * @attr ref android.R.styleable#ViewGroup_animateLayoutChanges 73 */ 74public abstract class ViewGroup extends View implements ViewParent, ViewManager { 75 76 private static final boolean DBG = false; 77 78 /** 79 * Views which have been hidden or removed which need to be animated on 80 * their way out. 81 * This field should be made private, so it is hidden from the SDK. 82 * {@hide} 83 */ 84 protected ArrayList<View> mDisappearingChildren; 85 86 /** 87 * Listener used to propagate events indicating when children are added 88 * and/or removed from a view group. 89 * This field should be made private, so it is hidden from the SDK. 90 * {@hide} 91 */ 92 protected OnHierarchyChangeListener mOnHierarchyChangeListener; 93 94 // The view contained within this ViewGroup that has or contains focus. 95 private View mFocused; 96 97 /** 98 * A Transformation used when drawing children, to 99 * apply on the child being drawn. 100 */ 101 private final Transformation mChildTransformation = new Transformation(); 102 103 /** 104 * Used to track the current invalidation region. 105 */ 106 private RectF mInvalidateRegion; 107 108 /** 109 * A Transformation used to calculate a correct 110 * invalidation area when the application is autoscaled. 111 */ 112 private Transformation mInvalidationTransformation; 113 114 // View currently under an ongoing drag 115 private View mCurrentDragView; 116 117 // Metadata about the ongoing drag 118 private DragEvent mCurrentDrag; 119 private HashSet<View> mDragNotifiedChildren; 120 121 // Does this group have a child that can accept the current drag payload? 122 private boolean mChildAcceptsDrag; 123 124 // Used during drag dispatch 125 private final PointF mLocalPoint = new PointF(); 126 127 // Layout animation 128 private LayoutAnimationController mLayoutAnimationController; 129 private Animation.AnimationListener mAnimationListener; 130 131 // First touch target in the linked list of touch targets. 132 private TouchTarget mFirstTouchTarget; 133 134 // For debugging only. You can see these in hierarchyviewer. 135 @SuppressWarnings({"FieldCanBeLocal", "UnusedDeclaration"}) 136 @ViewDebug.ExportedProperty(category = "events") 137 private long mLastTouchDownTime; 138 @ViewDebug.ExportedProperty(category = "events") 139 private int mLastTouchDownIndex = -1; 140 @SuppressWarnings({"FieldCanBeLocal", "UnusedDeclaration"}) 141 @ViewDebug.ExportedProperty(category = "events") 142 private float mLastTouchDownX; 143 @SuppressWarnings({"FieldCanBeLocal", "UnusedDeclaration"}) 144 @ViewDebug.ExportedProperty(category = "events") 145 private float mLastTouchDownY; 146 147 // First hover target in the linked list of hover targets. 148 // The hover targets are children which have received ACTION_HOVER_ENTER. 149 // They might not have actually handled the hover event, but we will 150 // continue sending hover events to them as long as the pointer remains over 151 // their bounds and the view group does not intercept hover. 152 private HoverTarget mFirstHoverTarget; 153 154 // True if the view group itself received a hover event. 155 // It might not have actually handled the hover event. 156 private boolean mHoveredSelf; 157 158 /** 159 * Internal flags. 160 * 161 * This field should be made private, so it is hidden from the SDK. 162 * {@hide} 163 */ 164 protected int mGroupFlags; 165 166 // When set, ViewGroup invalidates only the child's rectangle 167 // Set by default 168 private static final int FLAG_CLIP_CHILDREN = 0x1; 169 170 // When set, ViewGroup excludes the padding area from the invalidate rectangle 171 // Set by default 172 private static final int FLAG_CLIP_TO_PADDING = 0x2; 173 174 // When set, dispatchDraw() will invoke invalidate(); this is set by drawChild() when 175 // a child needs to be invalidated and FLAG_OPTIMIZE_INVALIDATE is set 176 private static final int FLAG_INVALIDATE_REQUIRED = 0x4; 177 178 // When set, dispatchDraw() will run the layout animation and unset the flag 179 private static final int FLAG_RUN_ANIMATION = 0x8; 180 181 // When set, there is either no layout animation on the ViewGroup or the layout 182 // animation is over 183 // Set by default 184 private static final int FLAG_ANIMATION_DONE = 0x10; 185 186 // If set, this ViewGroup has padding; if unset there is no padding and we don't need 187 // to clip it, even if FLAG_CLIP_TO_PADDING is set 188 private static final int FLAG_PADDING_NOT_NULL = 0x20; 189 190 // When set, this ViewGroup caches its children in a Bitmap before starting a layout animation 191 // Set by default 192 private static final int FLAG_ANIMATION_CACHE = 0x40; 193 194 // When set, this ViewGroup converts calls to invalidate(Rect) to invalidate() during a 195 // layout animation; this avoid clobbering the hierarchy 196 // Automatically set when the layout animation starts, depending on the animation's 197 // characteristics 198 private static final int FLAG_OPTIMIZE_INVALIDATE = 0x80; 199 200 // When set, the next call to drawChild() will clear mChildTransformation's matrix 201 private static final int FLAG_CLEAR_TRANSFORMATION = 0x100; 202 203 // When set, this ViewGroup invokes mAnimationListener.onAnimationEnd() and removes 204 // the children's Bitmap caches if necessary 205 // This flag is set when the layout animation is over (after FLAG_ANIMATION_DONE is set) 206 private static final int FLAG_NOTIFY_ANIMATION_LISTENER = 0x200; 207 208 /** 209 * When set, the drawing method will call {@link #getChildDrawingOrder(int, int)} 210 * to get the index of the child to draw for that iteration. 211 * 212 * @hide 213 */ 214 protected static final int FLAG_USE_CHILD_DRAWING_ORDER = 0x400; 215 216 /** 217 * When set, this ViewGroup supports static transformations on children; this causes 218 * {@link #getChildStaticTransformation(View, android.view.animation.Transformation)} to be 219 * invoked when a child is drawn. 220 * 221 * Any subclass overriding 222 * {@link #getChildStaticTransformation(View, android.view.animation.Transformation)} should 223 * set this flags in {@link #mGroupFlags}. 224 * 225 * {@hide} 226 */ 227 protected static final int FLAG_SUPPORT_STATIC_TRANSFORMATIONS = 0x800; 228 229 // When the previous drawChild() invocation used an alpha value that was lower than 230 // 1.0 and set it in mCachePaint 231 private static final int FLAG_ALPHA_LOWER_THAN_ONE = 0x1000; 232 233 /** 234 * When set, this ViewGroup's drawable states also include those 235 * of its children. 236 */ 237 private static final int FLAG_ADD_STATES_FROM_CHILDREN = 0x2000; 238 239 /** 240 * When set, this ViewGroup tries to always draw its children using their drawing cache. 241 */ 242 private static final int FLAG_ALWAYS_DRAWN_WITH_CACHE = 0x4000; 243 244 /** 245 * When set, and if FLAG_ALWAYS_DRAWN_WITH_CACHE is not set, this ViewGroup will try to 246 * draw its children with their drawing cache. 247 */ 248 private static final int FLAG_CHILDREN_DRAWN_WITH_CACHE = 0x8000; 249 250 /** 251 * When set, this group will go through its list of children to notify them of 252 * any drawable state change. 253 */ 254 private static final int FLAG_NOTIFY_CHILDREN_ON_DRAWABLE_STATE_CHANGE = 0x10000; 255 256 private static final int FLAG_MASK_FOCUSABILITY = 0x60000; 257 258 /** 259 * This view will get focus before any of its descendants. 260 */ 261 public static final int FOCUS_BEFORE_DESCENDANTS = 0x20000; 262 263 /** 264 * This view will get focus only if none of its descendants want it. 265 */ 266 public static final int FOCUS_AFTER_DESCENDANTS = 0x40000; 267 268 /** 269 * This view will block any of its descendants from getting focus, even 270 * if they are focusable. 271 */ 272 public static final int FOCUS_BLOCK_DESCENDANTS = 0x60000; 273 274 /** 275 * Used to map between enum in attrubutes and flag values. 276 */ 277 private static final int[] DESCENDANT_FOCUSABILITY_FLAGS = 278 {FOCUS_BEFORE_DESCENDANTS, FOCUS_AFTER_DESCENDANTS, 279 FOCUS_BLOCK_DESCENDANTS}; 280 281 /** 282 * When set, this ViewGroup should not intercept touch events. 283 * {@hide} 284 */ 285 protected static final int FLAG_DISALLOW_INTERCEPT = 0x80000; 286 287 /** 288 * When set, this ViewGroup will split MotionEvents to multiple child Views when appropriate. 289 */ 290 private static final int FLAG_SPLIT_MOTION_EVENTS = 0x200000; 291 292 /** 293 * Indicates which types of drawing caches are to be kept in memory. 294 * This field should be made private, so it is hidden from the SDK. 295 * {@hide} 296 */ 297 protected int mPersistentDrawingCache; 298 299 /** 300 * Used to indicate that no drawing cache should be kept in memory. 301 */ 302 public static final int PERSISTENT_NO_CACHE = 0x0; 303 304 /** 305 * Used to indicate that the animation drawing cache should be kept in memory. 306 */ 307 public static final int PERSISTENT_ANIMATION_CACHE = 0x1; 308 309 /** 310 * Used to indicate that the scrolling drawing cache should be kept in memory. 311 */ 312 public static final int PERSISTENT_SCROLLING_CACHE = 0x2; 313 314 /** 315 * Used to indicate that all drawing caches should be kept in memory. 316 */ 317 public static final int PERSISTENT_ALL_CACHES = 0x3; 318 319 /** 320 * We clip to padding when FLAG_CLIP_TO_PADDING and FLAG_PADDING_NOT_NULL 321 * are set at the same time. 322 */ 323 protected static final int CLIP_TO_PADDING_MASK = FLAG_CLIP_TO_PADDING | FLAG_PADDING_NOT_NULL; 324 325 // Index of the child's left position in the mLocation array 326 private static final int CHILD_LEFT_INDEX = 0; 327 // Index of the child's top position in the mLocation array 328 private static final int CHILD_TOP_INDEX = 1; 329 330 // Child views of this ViewGroup 331 private View[] mChildren; 332 // Number of valid children in the mChildren array, the rest should be null or not 333 // considered as children 334 335 private boolean mLayoutSuppressed = false; 336 337 private int mChildrenCount; 338 339 private static final int ARRAY_INITIAL_CAPACITY = 12; 340 private static final int ARRAY_CAPACITY_INCREMENT = 12; 341 342 // Used to draw cached views 343 private final Paint mCachePaint = new Paint(); 344 345 // Used to animate add/remove changes in layout 346 private LayoutTransition mTransition; 347 348 // The set of views that are currently being transitioned. This list is used to track views 349 // being removed that should not actually be removed from the parent yet because they are 350 // being animated. 351 private ArrayList<View> mTransitioningViews; 352 353 // List of children changing visibility. This is used to potentially keep rendering 354 // views during a transition when they otherwise would have become gone/invisible 355 private ArrayList<View> mVisibilityChangingChildren; 356 357 // Indicates whether this container will use its children layers to draw 358 @ViewDebug.ExportedProperty(category = "drawing") 359 private boolean mDrawLayers = true; 360 361 public ViewGroup(Context context) { 362 super(context); 363 initViewGroup(); 364 } 365 366 public ViewGroup(Context context, AttributeSet attrs) { 367 super(context, attrs); 368 initViewGroup(); 369 initFromAttributes(context, attrs); 370 } 371 372 public ViewGroup(Context context, AttributeSet attrs, int defStyle) { 373 super(context, attrs, defStyle); 374 initViewGroup(); 375 initFromAttributes(context, attrs); 376 } 377 378 private void initViewGroup() { 379 // ViewGroup doesn't draw by default 380 setFlags(WILL_NOT_DRAW, DRAW_MASK); 381 mGroupFlags |= FLAG_CLIP_CHILDREN; 382 mGroupFlags |= FLAG_CLIP_TO_PADDING; 383 mGroupFlags |= FLAG_ANIMATION_DONE; 384 mGroupFlags |= FLAG_ANIMATION_CACHE; 385 mGroupFlags |= FLAG_ALWAYS_DRAWN_WITH_CACHE; 386 387 if (mContext.getApplicationInfo().targetSdkVersion >= Build.VERSION_CODES.HONEYCOMB) { 388 mGroupFlags |= FLAG_SPLIT_MOTION_EVENTS; 389 } 390 391 setDescendantFocusability(FOCUS_BEFORE_DESCENDANTS); 392 393 mChildren = new View[ARRAY_INITIAL_CAPACITY]; 394 mChildrenCount = 0; 395 396 mCachePaint.setDither(false); 397 398 mPersistentDrawingCache = PERSISTENT_SCROLLING_CACHE; 399 } 400 401 private void initFromAttributes(Context context, AttributeSet attrs) { 402 TypedArray a = context.obtainStyledAttributes(attrs, 403 R.styleable.ViewGroup); 404 405 final int N = a.getIndexCount(); 406 for (int i = 0; i < N; i++) { 407 int attr = a.getIndex(i); 408 switch (attr) { 409 case R.styleable.ViewGroup_clipChildren: 410 setClipChildren(a.getBoolean(attr, true)); 411 break; 412 case R.styleable.ViewGroup_clipToPadding: 413 setClipToPadding(a.getBoolean(attr, true)); 414 break; 415 case R.styleable.ViewGroup_animationCache: 416 setAnimationCacheEnabled(a.getBoolean(attr, true)); 417 break; 418 case R.styleable.ViewGroup_persistentDrawingCache: 419 setPersistentDrawingCache(a.getInt(attr, PERSISTENT_SCROLLING_CACHE)); 420 break; 421 case R.styleable.ViewGroup_addStatesFromChildren: 422 setAddStatesFromChildren(a.getBoolean(attr, false)); 423 break; 424 case R.styleable.ViewGroup_alwaysDrawnWithCache: 425 setAlwaysDrawnWithCacheEnabled(a.getBoolean(attr, true)); 426 break; 427 case R.styleable.ViewGroup_layoutAnimation: 428 int id = a.getResourceId(attr, -1); 429 if (id > 0) { 430 setLayoutAnimation(AnimationUtils.loadLayoutAnimation(mContext, id)); 431 } 432 break; 433 case R.styleable.ViewGroup_descendantFocusability: 434 setDescendantFocusability(DESCENDANT_FOCUSABILITY_FLAGS[a.getInt(attr, 0)]); 435 break; 436 case R.styleable.ViewGroup_splitMotionEvents: 437 setMotionEventSplittingEnabled(a.getBoolean(attr, false)); 438 break; 439 case R.styleable.ViewGroup_animateLayoutChanges: 440 boolean animateLayoutChanges = a.getBoolean(attr, false); 441 if (animateLayoutChanges) { 442 setLayoutTransition(new LayoutTransition()); 443 } 444 break; 445 } 446 } 447 448 a.recycle(); 449 } 450 451 /** 452 * Gets the descendant focusability of this view group. The descendant 453 * focusability defines the relationship between this view group and its 454 * descendants when looking for a view to take focus in 455 * {@link #requestFocus(int, android.graphics.Rect)}. 456 * 457 * @return one of {@link #FOCUS_BEFORE_DESCENDANTS}, {@link #FOCUS_AFTER_DESCENDANTS}, 458 * {@link #FOCUS_BLOCK_DESCENDANTS}. 459 */ 460 @ViewDebug.ExportedProperty(category = "focus", mapping = { 461 @ViewDebug.IntToString(from = FOCUS_BEFORE_DESCENDANTS, to = "FOCUS_BEFORE_DESCENDANTS"), 462 @ViewDebug.IntToString(from = FOCUS_AFTER_DESCENDANTS, to = "FOCUS_AFTER_DESCENDANTS"), 463 @ViewDebug.IntToString(from = FOCUS_BLOCK_DESCENDANTS, to = "FOCUS_BLOCK_DESCENDANTS") 464 }) 465 public int getDescendantFocusability() { 466 return mGroupFlags & FLAG_MASK_FOCUSABILITY; 467 } 468 469 /** 470 * Set the descendant focusability of this view group. This defines the relationship 471 * between this view group and its descendants when looking for a view to 472 * take focus in {@link #requestFocus(int, android.graphics.Rect)}. 473 * 474 * @param focusability one of {@link #FOCUS_BEFORE_DESCENDANTS}, {@link #FOCUS_AFTER_DESCENDANTS}, 475 * {@link #FOCUS_BLOCK_DESCENDANTS}. 476 */ 477 public void setDescendantFocusability(int focusability) { 478 switch (focusability) { 479 case FOCUS_BEFORE_DESCENDANTS: 480 case FOCUS_AFTER_DESCENDANTS: 481 case FOCUS_BLOCK_DESCENDANTS: 482 break; 483 default: 484 throw new IllegalArgumentException("must be one of FOCUS_BEFORE_DESCENDANTS, " 485 + "FOCUS_AFTER_DESCENDANTS, FOCUS_BLOCK_DESCENDANTS"); 486 } 487 mGroupFlags &= ~FLAG_MASK_FOCUSABILITY; 488 mGroupFlags |= (focusability & FLAG_MASK_FOCUSABILITY); 489 } 490 491 /** 492 * {@inheritDoc} 493 */ 494 @Override 495 void handleFocusGainInternal(int direction, Rect previouslyFocusedRect) { 496 if (mFocused != null) { 497 mFocused.unFocus(); 498 mFocused = null; 499 } 500 super.handleFocusGainInternal(direction, previouslyFocusedRect); 501 } 502 503 /** 504 * {@inheritDoc} 505 */ 506 public void requestChildFocus(View child, View focused) { 507 if (DBG) { 508 System.out.println(this + " requestChildFocus()"); 509 } 510 if (getDescendantFocusability() == FOCUS_BLOCK_DESCENDANTS) { 511 return; 512 } 513 514 // Unfocus us, if necessary 515 super.unFocus(); 516 517 // We had a previous notion of who had focus. Clear it. 518 if (mFocused != child) { 519 if (mFocused != null) { 520 mFocused.unFocus(); 521 } 522 523 mFocused = child; 524 } 525 if (mParent != null) { 526 mParent.requestChildFocus(this, focused); 527 } 528 } 529 530 /** 531 * {@inheritDoc} 532 */ 533 public void focusableViewAvailable(View v) { 534 if (mParent != null 535 // shortcut: don't report a new focusable view if we block our descendants from 536 // getting focus 537 && (getDescendantFocusability() != FOCUS_BLOCK_DESCENDANTS) 538 // shortcut: don't report a new focusable view if we already are focused 539 // (and we don't prefer our descendants) 540 // 541 // note: knowing that mFocused is non-null is not a good enough reason 542 // to break the traversal since in that case we'd actually have to find 543 // the focused view and make sure it wasn't FOCUS_AFTER_DESCENDANTS and 544 // an ancestor of v; this will get checked for at ViewAncestor 545 && !(isFocused() && getDescendantFocusability() != FOCUS_AFTER_DESCENDANTS)) { 546 mParent.focusableViewAvailable(v); 547 } 548 } 549 550 /** 551 * {@inheritDoc} 552 */ 553 public boolean showContextMenuForChild(View originalView) { 554 return mParent != null && mParent.showContextMenuForChild(originalView); 555 } 556 557 /** 558 * {@inheritDoc} 559 */ 560 public ActionMode startActionModeForChild(View originalView, ActionMode.Callback callback) { 561 return mParent != null ? mParent.startActionModeForChild(originalView, callback) : null; 562 } 563 564 /** 565 * Find the nearest view in the specified direction that wants to take 566 * focus. 567 * 568 * @param focused The view that currently has focus 569 * @param direction One of FOCUS_UP, FOCUS_DOWN, FOCUS_LEFT, and 570 * FOCUS_RIGHT, or 0 for not applicable. 571 */ 572 public View focusSearch(View focused, int direction) { 573 if (isRootNamespace()) { 574 // root namespace means we should consider ourselves the top of the 575 // tree for focus searching; otherwise we could be focus searching 576 // into other tabs. see LocalActivityManager and TabHost for more info 577 return FocusFinder.getInstance().findNextFocus(this, focused, direction); 578 } else if (mParent != null) { 579 return mParent.focusSearch(focused, direction); 580 } 581 return null; 582 } 583 584 /** 585 * {@inheritDoc} 586 */ 587 public boolean requestChildRectangleOnScreen(View child, Rect rectangle, boolean immediate) { 588 return false; 589 } 590 591 /** 592 * {@inheritDoc} 593 */ 594 public boolean requestSendAccessibilityEvent(View child, AccessibilityEvent event) { 595 ViewParent parent = getParent(); 596 if (parent == null) { 597 return false; 598 } 599 final boolean propagate = onRequestSendAccessibilityEvent(child, event); 600 //noinspection SimplifiableIfStatement 601 if (!propagate) { 602 return false; 603 } 604 return parent.requestSendAccessibilityEvent(this, event); 605 } 606 607 /** 608 * Called when a child has requested sending an {@link AccessibilityEvent} and 609 * gives an opportunity to its parent to augment the event. 610 * <p> 611 * If an {@link AccessibilityDelegate} has been specified via calling 612 * {@link #setAccessibilityDelegate(AccessibilityDelegate)} its 613 * {@link AccessibilityDelegate#onRequestSendAccessibilityEvent(ViewGroup, View, AccessibilityEvent)} 614 * is responsible for handling this call. 615 * </p> 616 * 617 * @param child The child which requests sending the event. 618 * @param event The event to be sent. 619 * @return True if the event should be sent. 620 * 621 * @see #requestSendAccessibilityEvent(View, AccessibilityEvent) 622 */ 623 public boolean onRequestSendAccessibilityEvent(View child, AccessibilityEvent event) { 624 if (mAccessibilityDelegate != null) { 625 return mAccessibilityDelegate.onRequestSendAccessibilityEvent(this, child, event); 626 } else { 627 return onRequestSendAccessibilityEventInternal(child, event); 628 } 629 } 630 631 /** 632 * @see #onRequestSendAccessibilityEvent(View, AccessibilityEvent) 633 * 634 * Note: Called from the default {@link View.AccessibilityDelegate}. 635 */ 636 boolean onRequestSendAccessibilityEventInternal(View child, AccessibilityEvent event) { 637 return true; 638 } 639 640 /** 641 * {@inheritDoc} 642 */ 643 @Override 644 public boolean dispatchUnhandledMove(View focused, int direction) { 645 return mFocused != null && 646 mFocused.dispatchUnhandledMove(focused, direction); 647 } 648 649 /** 650 * {@inheritDoc} 651 */ 652 public void clearChildFocus(View child) { 653 if (DBG) { 654 System.out.println(this + " clearChildFocus()"); 655 } 656 657 mFocused = null; 658 if (mParent != null) { 659 mParent.clearChildFocus(this); 660 } 661 } 662 663 /** 664 * {@inheritDoc} 665 */ 666 @Override 667 public void clearFocus() { 668 super.clearFocus(); 669 670 // clear any child focus if it exists 671 if (mFocused != null) { 672 mFocused.clearFocus(); 673 } 674 } 675 676 /** 677 * {@inheritDoc} 678 */ 679 @Override 680 void unFocus() { 681 if (DBG) { 682 System.out.println(this + " unFocus()"); 683 } 684 685 super.unFocus(); 686 if (mFocused != null) { 687 mFocused.unFocus(); 688 } 689 mFocused = null; 690 } 691 692 /** 693 * Returns the focused child of this view, if any. The child may have focus 694 * or contain focus. 695 * 696 * @return the focused child or null. 697 */ 698 public View getFocusedChild() { 699 return mFocused; 700 } 701 702 /** 703 * Returns true if this view has or contains focus 704 * 705 * @return true if this view has or contains focus 706 */ 707 @Override 708 public boolean hasFocus() { 709 return (mPrivateFlags & FOCUSED) != 0 || mFocused != null; 710 } 711 712 /* 713 * (non-Javadoc) 714 * 715 * @see android.view.View#findFocus() 716 */ 717 @Override 718 public View findFocus() { 719 if (DBG) { 720 System.out.println("Find focus in " + this + ": flags=" 721 + isFocused() + ", child=" + mFocused); 722 } 723 724 if (isFocused()) { 725 return this; 726 } 727 728 if (mFocused != null) { 729 return mFocused.findFocus(); 730 } 731 return null; 732 } 733 734 /** 735 * {@inheritDoc} 736 */ 737 @Override 738 public boolean hasFocusable() { 739 if ((mViewFlags & VISIBILITY_MASK) != VISIBLE) { 740 return false; 741 } 742 743 if (isFocusable()) { 744 return true; 745 } 746 747 final int descendantFocusability = getDescendantFocusability(); 748 if (descendantFocusability != FOCUS_BLOCK_DESCENDANTS) { 749 final int count = mChildrenCount; 750 final View[] children = mChildren; 751 752 for (int i = 0; i < count; i++) { 753 final View child = children[i]; 754 if (child.hasFocusable()) { 755 return true; 756 } 757 } 758 } 759 760 return false; 761 } 762 763 /** 764 * {@inheritDoc} 765 */ 766 @Override 767 public void addFocusables(ArrayList<View> views, int direction) { 768 addFocusables(views, direction, FOCUSABLES_TOUCH_MODE); 769 } 770 771 /** 772 * {@inheritDoc} 773 */ 774 @Override 775 public void addFocusables(ArrayList<View> views, int direction, int focusableMode) { 776 final int focusableCount = views.size(); 777 778 final int descendantFocusability = getDescendantFocusability(); 779 780 if (descendantFocusability != FOCUS_BLOCK_DESCENDANTS) { 781 final int count = mChildrenCount; 782 final View[] children = mChildren; 783 784 for (int i = 0; i < count; i++) { 785 final View child = children[i]; 786 if ((child.mViewFlags & VISIBILITY_MASK) == VISIBLE) { 787 child.addFocusables(views, direction, focusableMode); 788 } 789 } 790 } 791 792 // we add ourselves (if focusable) in all cases except for when we are 793 // FOCUS_AFTER_DESCENDANTS and there are some descendants focusable. this is 794 // to avoid the focus search finding layouts when a more precise search 795 // among the focusable children would be more interesting. 796 if ( 797 descendantFocusability != FOCUS_AFTER_DESCENDANTS || 798 // No focusable descendants 799 (focusableCount == views.size())) { 800 super.addFocusables(views, direction, focusableMode); 801 } 802 } 803 804 @Override 805 public void findViewsWithText(ArrayList<View> outViews, CharSequence text) { 806 final int childrenCount = mChildrenCount; 807 final View[] children = mChildren; 808 for (int i = 0; i < childrenCount; i++) { 809 View child = children[i]; 810 if ((child.mPrivateFlags & IS_ROOT_NAMESPACE) == 0) { 811 child.findViewsWithText(outViews, text); 812 } 813 } 814 } 815 816 /** 817 * {@inheritDoc} 818 */ 819 @Override 820 public void dispatchWindowFocusChanged(boolean hasFocus) { 821 super.dispatchWindowFocusChanged(hasFocus); 822 final int count = mChildrenCount; 823 final View[] children = mChildren; 824 for (int i = 0; i < count; i++) { 825 children[i].dispatchWindowFocusChanged(hasFocus); 826 } 827 } 828 829 /** 830 * {@inheritDoc} 831 */ 832 @Override 833 public void addTouchables(ArrayList<View> views) { 834 super.addTouchables(views); 835 836 final int count = mChildrenCount; 837 final View[] children = mChildren; 838 839 for (int i = 0; i < count; i++) { 840 final View child = children[i]; 841 if ((child.mViewFlags & VISIBILITY_MASK) == VISIBLE) { 842 child.addTouchables(views); 843 } 844 } 845 } 846 847 /** 848 * {@inheritDoc} 849 */ 850 @Override 851 public void dispatchDisplayHint(int hint) { 852 super.dispatchDisplayHint(hint); 853 final int count = mChildrenCount; 854 final View[] children = mChildren; 855 for (int i = 0; i < count; i++) { 856 children[i].dispatchDisplayHint(hint); 857 } 858 } 859 860 /** 861 * @hide 862 * @param child 863 * @param visibility 864 */ 865 protected void onChildVisibilityChanged(View child, int visibility) { 866 if (mTransition != null) { 867 if (visibility == VISIBLE) { 868 mTransition.showChild(this, child); 869 } else { 870 mTransition.hideChild(this, child); 871 } 872 if (visibility != VISIBLE) { 873 // Only track this on disappearing views - appearing views are already visible 874 // and don't need special handling during drawChild() 875 if (mVisibilityChangingChildren == null) { 876 mVisibilityChangingChildren = new ArrayList<View>(); 877 } 878 mVisibilityChangingChildren.add(child); 879 if (mTransitioningViews != null && mTransitioningViews.contains(child)) { 880 addDisappearingView(child); 881 } 882 } 883 } 884 885 // in all cases, for drags 886 if (mCurrentDrag != null) { 887 if (visibility == VISIBLE) { 888 notifyChildOfDrag(child); 889 } 890 } 891 } 892 893 /** 894 * {@inheritDoc} 895 */ 896 @Override 897 protected void dispatchVisibilityChanged(View changedView, int visibility) { 898 super.dispatchVisibilityChanged(changedView, visibility); 899 final int count = mChildrenCount; 900 final View[] children = mChildren; 901 for (int i = 0; i < count; i++) { 902 children[i].dispatchVisibilityChanged(changedView, visibility); 903 } 904 } 905 906 /** 907 * {@inheritDoc} 908 */ 909 @Override 910 public void dispatchWindowVisibilityChanged(int visibility) { 911 super.dispatchWindowVisibilityChanged(visibility); 912 final int count = mChildrenCount; 913 final View[] children = mChildren; 914 for (int i = 0; i < count; i++) { 915 children[i].dispatchWindowVisibilityChanged(visibility); 916 } 917 } 918 919 /** 920 * {@inheritDoc} 921 */ 922 @Override 923 public void dispatchConfigurationChanged(Configuration newConfig) { 924 super.dispatchConfigurationChanged(newConfig); 925 final int count = mChildrenCount; 926 final View[] children = mChildren; 927 for (int i = 0; i < count; i++) { 928 children[i].dispatchConfigurationChanged(newConfig); 929 } 930 } 931 932 /** 933 * {@inheritDoc} 934 */ 935 public void recomputeViewAttributes(View child) { 936 if (mAttachInfo != null && !mAttachInfo.mRecomputeGlobalAttributes) { 937 ViewParent parent = mParent; 938 if (parent != null) parent.recomputeViewAttributes(this); 939 } 940 } 941 942 @Override 943 void dispatchCollectViewAttributes(int visibility) { 944 visibility |= mViewFlags&VISIBILITY_MASK; 945 super.dispatchCollectViewAttributes(visibility); 946 final int count = mChildrenCount; 947 final View[] children = mChildren; 948 for (int i = 0; i < count; i++) { 949 children[i].dispatchCollectViewAttributes(visibility); 950 } 951 } 952 953 /** 954 * {@inheritDoc} 955 */ 956 public void bringChildToFront(View child) { 957 int index = indexOfChild(child); 958 if (index >= 0) { 959 removeFromArray(index); 960 addInArray(child, mChildrenCount); 961 child.mParent = this; 962 } 963 } 964 965 /** 966 * {@inheritDoc} 967 * 968 * !!! TODO: write real docs 969 */ 970 @Override 971 public boolean dispatchDragEvent(DragEvent event) { 972 boolean retval = false; 973 final float tx = event.mX; 974 final float ty = event.mY; 975 976 ViewRootImpl root = getViewRootImpl(); 977 978 // Dispatch down the view hierarchy 979 switch (event.mAction) { 980 case DragEvent.ACTION_DRAG_STARTED: { 981 // clear state to recalculate which views we drag over 982 mCurrentDragView = null; 983 984 // Set up our tracking of drag-started notifications 985 mCurrentDrag = DragEvent.obtain(event); 986 if (mDragNotifiedChildren == null) { 987 mDragNotifiedChildren = new HashSet<View>(); 988 } else { 989 mDragNotifiedChildren.clear(); 990 } 991 992 // Now dispatch down to our children, caching the responses 993 mChildAcceptsDrag = false; 994 final int count = mChildrenCount; 995 final View[] children = mChildren; 996 for (int i = 0; i < count; i++) { 997 final View child = children[i]; 998 child.mPrivateFlags2 &= ~View.DRAG_MASK; 999 if (child.getVisibility() == VISIBLE) { 1000 final boolean handled = notifyChildOfDrag(children[i]); 1001 if (handled) { 1002 mChildAcceptsDrag = true; 1003 } 1004 } 1005 } 1006 1007 // Return HANDLED if one of our children can accept the drag 1008 if (mChildAcceptsDrag) { 1009 retval = true; 1010 } 1011 } break; 1012 1013 case DragEvent.ACTION_DRAG_ENDED: { 1014 // Release the bookkeeping now that the drag lifecycle has ended 1015 if (mDragNotifiedChildren != null) { 1016 for (View child : mDragNotifiedChildren) { 1017 // If a child was notified about an ongoing drag, it's told that it's over 1018 child.dispatchDragEvent(event); 1019 child.mPrivateFlags2 &= ~View.DRAG_MASK; 1020 child.refreshDrawableState(); 1021 } 1022 1023 mDragNotifiedChildren.clear(); 1024 mCurrentDrag.recycle(); 1025 mCurrentDrag = null; 1026 } 1027 1028 // We consider drag-ended to have been handled if one of our children 1029 // had offered to handle the drag. 1030 if (mChildAcceptsDrag) { 1031 retval = true; 1032 } 1033 } break; 1034 1035 case DragEvent.ACTION_DRAG_LOCATION: { 1036 // Find the [possibly new] drag target 1037 final View target = findFrontmostDroppableChildAt(event.mX, event.mY, mLocalPoint); 1038 1039 // If we've changed apparent drag target, tell the view root which view 1040 // we're over now [for purposes of the eventual drag-recipient-changed 1041 // notifications to the framework] and tell the new target that the drag 1042 // has entered its bounds. The root will see setDragFocus() calls all 1043 // the way down to the final leaf view that is handling the LOCATION event 1044 // before reporting the new potential recipient to the framework. 1045 if (mCurrentDragView != target) { 1046 root.setDragFocus(target); 1047 1048 final int action = event.mAction; 1049 // If we've dragged off of a child view, send it the EXITED message 1050 if (mCurrentDragView != null) { 1051 final View view = mCurrentDragView; 1052 event.mAction = DragEvent.ACTION_DRAG_EXITED; 1053 view.dispatchDragEvent(event); 1054 view.mPrivateFlags2 &= ~View.DRAG_HOVERED; 1055 view.refreshDrawableState(); 1056 } 1057 mCurrentDragView = target; 1058 1059 // If we've dragged over a new child view, send it the ENTERED message 1060 if (target != null) { 1061 event.mAction = DragEvent.ACTION_DRAG_ENTERED; 1062 target.dispatchDragEvent(event); 1063 target.mPrivateFlags2 |= View.DRAG_HOVERED; 1064 target.refreshDrawableState(); 1065 } 1066 event.mAction = action; // restore the event's original state 1067 } 1068 1069 // Dispatch the actual drag location notice, localized into its coordinates 1070 if (target != null) { 1071 event.mX = mLocalPoint.x; 1072 event.mY = mLocalPoint.y; 1073 1074 retval = target.dispatchDragEvent(event); 1075 1076 event.mX = tx; 1077 event.mY = ty; 1078 } 1079 } break; 1080 1081 /* Entered / exited dispatch 1082 * 1083 * DRAG_ENTERED is not dispatched downwards from ViewGroup. The reason for this is 1084 * that we're about to get the corresponding LOCATION event, which we will use to 1085 * determine which of our children is the new target; at that point we will 1086 * push a DRAG_ENTERED down to the new target child [which may itself be a ViewGroup]. 1087 * 1088 * DRAG_EXITED *is* dispatched all the way down immediately: once we know the 1089 * drag has left this ViewGroup, we know by definition that every contained subview 1090 * is also no longer under the drag point. 1091 */ 1092 1093 case DragEvent.ACTION_DRAG_EXITED: { 1094 if (mCurrentDragView != null) { 1095 final View view = mCurrentDragView; 1096 view.dispatchDragEvent(event); 1097 view.mPrivateFlags2 &= ~View.DRAG_HOVERED; 1098 view.refreshDrawableState(); 1099 1100 mCurrentDragView = null; 1101 } 1102 } break; 1103 1104 case DragEvent.ACTION_DROP: { 1105 if (ViewDebug.DEBUG_DRAG) Log.d(View.VIEW_LOG_TAG, "Drop event: " + event); 1106 View target = findFrontmostDroppableChildAt(event.mX, event.mY, mLocalPoint); 1107 if (target != null) { 1108 if (ViewDebug.DEBUG_DRAG) Log.d(View.VIEW_LOG_TAG, " dispatch drop to " + target); 1109 event.mX = mLocalPoint.x; 1110 event.mY = mLocalPoint.y; 1111 retval = target.dispatchDragEvent(event); 1112 event.mX = tx; 1113 event.mY = ty; 1114 } else { 1115 if (ViewDebug.DEBUG_DRAG) { 1116 Log.d(View.VIEW_LOG_TAG, " not dropped on an accepting view"); 1117 } 1118 } 1119 } break; 1120 } 1121 1122 // If none of our children could handle the event, try here 1123 if (!retval) { 1124 // Call up to the View implementation that dispatches to installed listeners 1125 retval = super.dispatchDragEvent(event); 1126 } 1127 return retval; 1128 } 1129 1130 // Find the frontmost child view that lies under the given point, and calculate 1131 // the position within its own local coordinate system. 1132 View findFrontmostDroppableChildAt(float x, float y, PointF outLocalPoint) { 1133 final int count = mChildrenCount; 1134 final View[] children = mChildren; 1135 for (int i = count - 1; i >= 0; i--) { 1136 final View child = children[i]; 1137 if (!child.canAcceptDrag()) { 1138 continue; 1139 } 1140 1141 if (isTransformedTouchPointInView(x, y, child, outLocalPoint)) { 1142 return child; 1143 } 1144 } 1145 return null; 1146 } 1147 1148 boolean notifyChildOfDrag(View child) { 1149 if (ViewDebug.DEBUG_DRAG) { 1150 Log.d(View.VIEW_LOG_TAG, "Sending drag-started to view: " + child); 1151 } 1152 1153 boolean canAccept = false; 1154 if (! mDragNotifiedChildren.contains(child)) { 1155 mDragNotifiedChildren.add(child); 1156 canAccept = child.dispatchDragEvent(mCurrentDrag); 1157 if (canAccept && !child.canAcceptDrag()) { 1158 child.mPrivateFlags2 |= View.DRAG_CAN_ACCEPT; 1159 child.refreshDrawableState(); 1160 } 1161 } 1162 return canAccept; 1163 } 1164 1165 @Override 1166 public void dispatchSystemUiVisibilityChanged(int visible) { 1167 super.dispatchSystemUiVisibilityChanged(visible); 1168 1169 final int count = mChildrenCount; 1170 final View[] children = mChildren; 1171 for (int i=0; i <count; i++) { 1172 final View child = children[i]; 1173 child.dispatchSystemUiVisibilityChanged(visible); 1174 } 1175 } 1176 1177 /** 1178 * {@inheritDoc} 1179 */ 1180 @Override 1181 public boolean dispatchKeyEventPreIme(KeyEvent event) { 1182 if ((mPrivateFlags & (FOCUSED | HAS_BOUNDS)) == (FOCUSED | HAS_BOUNDS)) { 1183 return super.dispatchKeyEventPreIme(event); 1184 } else if (mFocused != null && (mFocused.mPrivateFlags & HAS_BOUNDS) == HAS_BOUNDS) { 1185 return mFocused.dispatchKeyEventPreIme(event); 1186 } 1187 return false; 1188 } 1189 1190 /** 1191 * {@inheritDoc} 1192 */ 1193 @Override 1194 public boolean dispatchKeyEvent(KeyEvent event) { 1195 if (mInputEventConsistencyVerifier != null) { 1196 mInputEventConsistencyVerifier.onKeyEvent(event, 1); 1197 } 1198 1199 if ((mPrivateFlags & (FOCUSED | HAS_BOUNDS)) == (FOCUSED | HAS_BOUNDS)) { 1200 if (super.dispatchKeyEvent(event)) { 1201 return true; 1202 } 1203 } else if (mFocused != null && (mFocused.mPrivateFlags & HAS_BOUNDS) == HAS_BOUNDS) { 1204 if (mFocused.dispatchKeyEvent(event)) { 1205 return true; 1206 } 1207 } 1208 1209 if (mInputEventConsistencyVerifier != null) { 1210 mInputEventConsistencyVerifier.onUnhandledEvent(event, 1); 1211 } 1212 return false; 1213 } 1214 1215 /** 1216 * {@inheritDoc} 1217 */ 1218 @Override 1219 public boolean dispatchKeyShortcutEvent(KeyEvent event) { 1220 if ((mPrivateFlags & (FOCUSED | HAS_BOUNDS)) == (FOCUSED | HAS_BOUNDS)) { 1221 return super.dispatchKeyShortcutEvent(event); 1222 } else if (mFocused != null && (mFocused.mPrivateFlags & HAS_BOUNDS) == HAS_BOUNDS) { 1223 return mFocused.dispatchKeyShortcutEvent(event); 1224 } 1225 return false; 1226 } 1227 1228 /** 1229 * {@inheritDoc} 1230 */ 1231 @Override 1232 public boolean dispatchTrackballEvent(MotionEvent event) { 1233 if (mInputEventConsistencyVerifier != null) { 1234 mInputEventConsistencyVerifier.onTrackballEvent(event, 1); 1235 } 1236 1237 if ((mPrivateFlags & (FOCUSED | HAS_BOUNDS)) == (FOCUSED | HAS_BOUNDS)) { 1238 if (super.dispatchTrackballEvent(event)) { 1239 return true; 1240 } 1241 } else if (mFocused != null && (mFocused.mPrivateFlags & HAS_BOUNDS) == HAS_BOUNDS) { 1242 if (mFocused.dispatchTrackballEvent(event)) { 1243 return true; 1244 } 1245 } 1246 1247 if (mInputEventConsistencyVerifier != null) { 1248 mInputEventConsistencyVerifier.onUnhandledEvent(event, 1); 1249 } 1250 return false; 1251 } 1252 1253 /** 1254 * {@inheritDoc} 1255 */ 1256 @SuppressWarnings({"ConstantConditions"}) 1257 @Override 1258 protected boolean dispatchHoverEvent(MotionEvent event) { 1259 final int action = event.getAction(); 1260 1261 // First check whether the view group wants to intercept the hover event. 1262 final boolean interceptHover = onInterceptHoverEvent(event); 1263 event.setAction(action); // restore action in case it was changed 1264 1265 MotionEvent eventNoHistory = event; 1266 boolean handled = false; 1267 1268 // Send events to the hovered children and build a new list of hover targets until 1269 // one is found that handles the event. 1270 HoverTarget firstOldHoverTarget = mFirstHoverTarget; 1271 mFirstHoverTarget = null; 1272 if (!interceptHover && action != MotionEvent.ACTION_HOVER_EXIT) { 1273 final float x = event.getX(); 1274 final float y = event.getY(); 1275 final int childrenCount = mChildrenCount; 1276 if (childrenCount != 0) { 1277 final View[] children = mChildren; 1278 HoverTarget lastHoverTarget = null; 1279 for (int i = childrenCount - 1; i >= 0; i--) { 1280 final View child = children[i]; 1281 if (!canViewReceivePointerEvents(child) 1282 || !isTransformedTouchPointInView(x, y, child, null)) { 1283 continue; 1284 } 1285 1286 // Obtain a hover target for this child. Dequeue it from the 1287 // old hover target list if the child was previously hovered. 1288 HoverTarget hoverTarget = firstOldHoverTarget; 1289 final boolean wasHovered; 1290 for (HoverTarget predecessor = null; ;) { 1291 if (hoverTarget == null) { 1292 hoverTarget = HoverTarget.obtain(child); 1293 wasHovered = false; 1294 break; 1295 } 1296 1297 if (hoverTarget.child == child) { 1298 if (predecessor != null) { 1299 predecessor.next = hoverTarget.next; 1300 } else { 1301 firstOldHoverTarget = hoverTarget.next; 1302 } 1303 hoverTarget.next = null; 1304 wasHovered = true; 1305 break; 1306 } 1307 1308 predecessor = hoverTarget; 1309 hoverTarget = hoverTarget.next; 1310 } 1311 1312 // Enqueue the hover target onto the new hover target list. 1313 if (lastHoverTarget != null) { 1314 lastHoverTarget.next = hoverTarget; 1315 } else { 1316 lastHoverTarget = hoverTarget; 1317 mFirstHoverTarget = hoverTarget; 1318 } 1319 1320 // Dispatch the event to the child. 1321 if (action == MotionEvent.ACTION_HOVER_ENTER) { 1322 if (!wasHovered) { 1323 // Send the enter as is. 1324 handled |= dispatchTransformedGenericPointerEvent( 1325 event, child); // enter 1326 } 1327 } else if (action == MotionEvent.ACTION_HOVER_MOVE) { 1328 if (!wasHovered) { 1329 // Synthesize an enter from a move. 1330 eventNoHistory = obtainMotionEventNoHistoryOrSelf(eventNoHistory); 1331 eventNoHistory.setAction(MotionEvent.ACTION_HOVER_ENTER); 1332 handled |= dispatchTransformedGenericPointerEvent( 1333 eventNoHistory, child); // enter 1334 eventNoHistory.setAction(action); 1335 1336 handled |= dispatchTransformedGenericPointerEvent( 1337 eventNoHistory, child); // move 1338 } else { 1339 // Send the move as is. 1340 handled |= dispatchTransformedGenericPointerEvent(event, child); 1341 } 1342 } 1343 if (handled) { 1344 break; 1345 } 1346 } 1347 } 1348 } 1349 1350 // Send exit events to all previously hovered children that are no longer hovered. 1351 while (firstOldHoverTarget != null) { 1352 final View child = firstOldHoverTarget.child; 1353 1354 // Exit the old hovered child. 1355 if (action == MotionEvent.ACTION_HOVER_EXIT) { 1356 // Send the exit as is. 1357 handled |= dispatchTransformedGenericPointerEvent( 1358 event, child); // exit 1359 } else { 1360 // Synthesize an exit from a move or enter. 1361 // Ignore the result because hover focus has moved to a different view. 1362 if (action == MotionEvent.ACTION_HOVER_MOVE) { 1363 dispatchTransformedGenericPointerEvent( 1364 event, child); // move 1365 } 1366 eventNoHistory = obtainMotionEventNoHistoryOrSelf(eventNoHistory); 1367 eventNoHistory.setAction(MotionEvent.ACTION_HOVER_EXIT); 1368 dispatchTransformedGenericPointerEvent( 1369 eventNoHistory, child); // exit 1370 eventNoHistory.setAction(action); 1371 } 1372 1373 final HoverTarget nextOldHoverTarget = firstOldHoverTarget.next; 1374 firstOldHoverTarget.recycle(); 1375 firstOldHoverTarget = nextOldHoverTarget; 1376 } 1377 1378 // Send events to the view group itself if no children have handled it. 1379 boolean newHoveredSelf = !handled; 1380 if (newHoveredSelf == mHoveredSelf) { 1381 if (newHoveredSelf) { 1382 // Send event to the view group as before. 1383 handled |= super.dispatchHoverEvent(event); 1384 } 1385 } else { 1386 if (mHoveredSelf) { 1387 // Exit the view group. 1388 if (action == MotionEvent.ACTION_HOVER_EXIT) { 1389 // Send the exit as is. 1390 handled |= super.dispatchHoverEvent(event); // exit 1391 } else { 1392 // Synthesize an exit from a move or enter. 1393 // Ignore the result because hover focus is moving to a different view. 1394 if (action == MotionEvent.ACTION_HOVER_MOVE) { 1395 super.dispatchHoverEvent(event); // move 1396 } 1397 eventNoHistory = obtainMotionEventNoHistoryOrSelf(eventNoHistory); 1398 eventNoHistory.setAction(MotionEvent.ACTION_HOVER_EXIT); 1399 super.dispatchHoverEvent(eventNoHistory); // exit 1400 eventNoHistory.setAction(action); 1401 } 1402 mHoveredSelf = false; 1403 } 1404 1405 if (newHoveredSelf) { 1406 // Enter the view group. 1407 if (action == MotionEvent.ACTION_HOVER_ENTER) { 1408 // Send the enter as is. 1409 handled |= super.dispatchHoverEvent(event); // enter 1410 mHoveredSelf = true; 1411 } else if (action == MotionEvent.ACTION_HOVER_MOVE) { 1412 // Synthesize an enter from a move. 1413 eventNoHistory = obtainMotionEventNoHistoryOrSelf(eventNoHistory); 1414 eventNoHistory.setAction(MotionEvent.ACTION_HOVER_ENTER); 1415 handled |= super.dispatchHoverEvent(eventNoHistory); // enter 1416 eventNoHistory.setAction(action); 1417 1418 handled |= super.dispatchHoverEvent(eventNoHistory); // move 1419 mHoveredSelf = true; 1420 } 1421 } 1422 } 1423 1424 // Recycle the copy of the event that we made. 1425 if (eventNoHistory != event) { 1426 eventNoHistory.recycle(); 1427 } 1428 1429 // Done. 1430 return handled; 1431 } 1432 1433 /** @hide */ 1434 @Override 1435 protected boolean hasHoveredChild() { 1436 return mFirstHoverTarget != null; 1437 } 1438 1439 /** 1440 * Implement this method to intercept hover events before they are handled 1441 * by child views. 1442 * <p> 1443 * This method is called before dispatching a hover event to a child of 1444 * the view group or to the view group's own {@link #onHoverEvent} to allow 1445 * the view group a chance to intercept the hover event. 1446 * This method can also be used to watch all pointer motions that occur within 1447 * the bounds of the view group even when the pointer is hovering over 1448 * a child of the view group rather than over the view group itself. 1449 * </p><p> 1450 * The view group can prevent its children from receiving hover events by 1451 * implementing this method and returning <code>true</code> to indicate 1452 * that it would like to intercept hover events. The view group must 1453 * continuously return <code>true</code> from {@link #onInterceptHoverEvent} 1454 * for as long as it wishes to continue intercepting hover events from 1455 * its children. 1456 * </p><p> 1457 * Interception preserves the invariant that at most one view can be 1458 * hovered at a time by transferring hover focus from the currently hovered 1459 * child to the view group or vice-versa as needed. 1460 * </p><p> 1461 * If this method returns <code>true</code> and a child is already hovered, then the 1462 * child view will first receive a hover exit event and then the view group 1463 * itself will receive a hover enter event in {@link #onHoverEvent}. 1464 * Likewise, if this method had previously returned <code>true</code> to intercept hover 1465 * events and instead returns <code>false</code> while the pointer is hovering 1466 * within the bounds of one of a child, then the view group will first receive a 1467 * hover exit event in {@link #onHoverEvent} and then the hovered child will 1468 * receive a hover enter event. 1469 * </p><p> 1470 * The default implementation always returns false. 1471 * </p> 1472 * 1473 * @param event The motion event that describes the hover. 1474 * @return True if the view group would like to intercept the hover event 1475 * and prevent its children from receiving it. 1476 */ 1477 public boolean onInterceptHoverEvent(MotionEvent event) { 1478 return false; 1479 } 1480 1481 private static MotionEvent obtainMotionEventNoHistoryOrSelf(MotionEvent event) { 1482 if (event.getHistorySize() == 0) { 1483 return event; 1484 } 1485 return MotionEvent.obtainNoHistory(event); 1486 } 1487 1488 /** 1489 * {@inheritDoc} 1490 */ 1491 @Override 1492 protected boolean dispatchGenericPointerEvent(MotionEvent event) { 1493 // Send the event to the child under the pointer. 1494 final int childrenCount = mChildrenCount; 1495 if (childrenCount != 0) { 1496 final View[] children = mChildren; 1497 final float x = event.getX(); 1498 final float y = event.getY(); 1499 1500 for (int i = childrenCount - 1; i >= 0; i--) { 1501 final View child = children[i]; 1502 if (!canViewReceivePointerEvents(child) 1503 || !isTransformedTouchPointInView(x, y, child, null)) { 1504 continue; 1505 } 1506 1507 if (dispatchTransformedGenericPointerEvent(event, child)) { 1508 return true; 1509 } 1510 } 1511 } 1512 1513 // No child handled the event. Send it to this view group. 1514 return super.dispatchGenericPointerEvent(event); 1515 } 1516 1517 /** 1518 * {@inheritDoc} 1519 */ 1520 @Override 1521 protected boolean dispatchGenericFocusedEvent(MotionEvent event) { 1522 // Send the event to the focused child or to this view group if it has focus. 1523 if ((mPrivateFlags & (FOCUSED | HAS_BOUNDS)) == (FOCUSED | HAS_BOUNDS)) { 1524 return super.dispatchGenericFocusedEvent(event); 1525 } else if (mFocused != null && (mFocused.mPrivateFlags & HAS_BOUNDS) == HAS_BOUNDS) { 1526 return mFocused.dispatchGenericMotionEvent(event); 1527 } 1528 return false; 1529 } 1530 1531 /** 1532 * Dispatches a generic pointer event to a child, taking into account 1533 * transformations that apply to the child. 1534 * 1535 * @param event The event to send. 1536 * @param child The view to send the event to. 1537 * @return {@code true} if the child handled the event. 1538 */ 1539 private boolean dispatchTransformedGenericPointerEvent(MotionEvent event, View child) { 1540 final float offsetX = mScrollX - child.mLeft; 1541 final float offsetY = mScrollY - child.mTop; 1542 1543 boolean handled; 1544 if (!child.hasIdentityMatrix()) { 1545 MotionEvent transformedEvent = MotionEvent.obtain(event); 1546 transformedEvent.offsetLocation(offsetX, offsetY); 1547 transformedEvent.transform(child.getInverseMatrix()); 1548 handled = child.dispatchGenericMotionEvent(transformedEvent); 1549 transformedEvent.recycle(); 1550 } else { 1551 event.offsetLocation(offsetX, offsetY); 1552 handled = child.dispatchGenericMotionEvent(event); 1553 event.offsetLocation(-offsetX, -offsetY); 1554 } 1555 return handled; 1556 } 1557 1558 /** 1559 * {@inheritDoc} 1560 */ 1561 @Override 1562 public boolean dispatchTouchEvent(MotionEvent ev) { 1563 if (mInputEventConsistencyVerifier != null) { 1564 mInputEventConsistencyVerifier.onTouchEvent(ev, 1); 1565 } 1566 1567 boolean handled = false; 1568 if (onFilterTouchEventForSecurity(ev)) { 1569 final int action = ev.getAction(); 1570 final int actionMasked = action & MotionEvent.ACTION_MASK; 1571 1572 // Handle an initial down. 1573 if (actionMasked == MotionEvent.ACTION_DOWN) { 1574 // Throw away all previous state when starting a new touch gesture. 1575 // The framework may have dropped the up or cancel event for the previous gesture 1576 // due to an app switch, ANR, or some other state change. 1577 cancelAndClearTouchTargets(ev); 1578 resetTouchState(); 1579 } 1580 1581 // Check for interception. 1582 final boolean intercepted; 1583 if (actionMasked == MotionEvent.ACTION_DOWN 1584 || mFirstTouchTarget != null) { 1585 final boolean disallowIntercept = (mGroupFlags & FLAG_DISALLOW_INTERCEPT) != 0; 1586 if (!disallowIntercept) { 1587 intercepted = onInterceptTouchEvent(ev); 1588 ev.setAction(action); // restore action in case it was changed 1589 } else { 1590 intercepted = false; 1591 } 1592 } else { 1593 // There are no touch targets and this action is not an initial down 1594 // so this view group continues to intercept touches. 1595 intercepted = true; 1596 } 1597 1598 // Check for cancelation. 1599 final boolean canceled = resetCancelNextUpFlag(this) 1600 || actionMasked == MotionEvent.ACTION_CANCEL; 1601 1602 // Update list of touch targets for pointer down, if needed. 1603 final boolean split = (mGroupFlags & FLAG_SPLIT_MOTION_EVENTS) != 0; 1604 TouchTarget newTouchTarget = null; 1605 boolean alreadyDispatchedToNewTouchTarget = false; 1606 if (!canceled && !intercepted) { 1607 if (actionMasked == MotionEvent.ACTION_DOWN 1608 || (split && actionMasked == MotionEvent.ACTION_POINTER_DOWN) 1609 || actionMasked == MotionEvent.ACTION_HOVER_MOVE) { 1610 final int actionIndex = ev.getActionIndex(); // always 0 for down 1611 final int idBitsToAssign = split ? 1 << ev.getPointerId(actionIndex) 1612 : TouchTarget.ALL_POINTER_IDS; 1613 1614 // Clean up earlier touch targets for this pointer id in case they 1615 // have become out of sync. 1616 removePointersFromTouchTargets(idBitsToAssign); 1617 1618 final int childrenCount = mChildrenCount; 1619 if (childrenCount != 0) { 1620 // Find a child that can receive the event. 1621 // Scan children from front to back. 1622 final View[] children = mChildren; 1623 final float x = ev.getX(actionIndex); 1624 final float y = ev.getY(actionIndex); 1625 1626 for (int i = childrenCount - 1; i >= 0; i--) { 1627 final View child = children[i]; 1628 if (!canViewReceivePointerEvents(child) 1629 || !isTransformedTouchPointInView(x, y, child, null)) { 1630 continue; 1631 } 1632 1633 newTouchTarget = getTouchTarget(child); 1634 if (newTouchTarget != null) { 1635 // Child is already receiving touch within its bounds. 1636 // Give it the new pointer in addition to the ones it is handling. 1637 newTouchTarget.pointerIdBits |= idBitsToAssign; 1638 break; 1639 } 1640 1641 resetCancelNextUpFlag(child); 1642 if (dispatchTransformedTouchEvent(ev, false, child, idBitsToAssign)) { 1643 // Child wants to receive touch within its bounds. 1644 mLastTouchDownTime = ev.getDownTime(); 1645 mLastTouchDownIndex = i; 1646 mLastTouchDownX = ev.getX(); 1647 mLastTouchDownY = ev.getY(); 1648 newTouchTarget = addTouchTarget(child, idBitsToAssign); 1649 alreadyDispatchedToNewTouchTarget = true; 1650 break; 1651 } 1652 } 1653 } 1654 1655 if (newTouchTarget == null && mFirstTouchTarget != null) { 1656 // Did not find a child to receive the event. 1657 // Assign the pointer to the least recently added target. 1658 newTouchTarget = mFirstTouchTarget; 1659 while (newTouchTarget.next != null) { 1660 newTouchTarget = newTouchTarget.next; 1661 } 1662 newTouchTarget.pointerIdBits |= idBitsToAssign; 1663 } 1664 } 1665 } 1666 1667 // Dispatch to touch targets. 1668 if (mFirstTouchTarget == null) { 1669 // No touch targets so treat this as an ordinary view. 1670 handled = dispatchTransformedTouchEvent(ev, canceled, null, 1671 TouchTarget.ALL_POINTER_IDS); 1672 } else { 1673 // Dispatch to touch targets, excluding the new touch target if we already 1674 // dispatched to it. Cancel touch targets if necessary. 1675 TouchTarget predecessor = null; 1676 TouchTarget target = mFirstTouchTarget; 1677 while (target != null) { 1678 final TouchTarget next = target.next; 1679 if (alreadyDispatchedToNewTouchTarget && target == newTouchTarget) { 1680 handled = true; 1681 } else { 1682 final boolean cancelChild = resetCancelNextUpFlag(target.child) 1683 || intercepted; 1684 if (dispatchTransformedTouchEvent(ev, cancelChild, 1685 target.child, target.pointerIdBits)) { 1686 handled = true; 1687 } 1688 if (cancelChild) { 1689 if (predecessor == null) { 1690 mFirstTouchTarget = next; 1691 } else { 1692 predecessor.next = next; 1693 } 1694 target.recycle(); 1695 target = next; 1696 continue; 1697 } 1698 } 1699 predecessor = target; 1700 target = next; 1701 } 1702 } 1703 1704 // Update list of touch targets for pointer up or cancel, if needed. 1705 if (canceled 1706 || actionMasked == MotionEvent.ACTION_UP 1707 || actionMasked == MotionEvent.ACTION_HOVER_MOVE) { 1708 resetTouchState(); 1709 } else if (split && actionMasked == MotionEvent.ACTION_POINTER_UP) { 1710 final int actionIndex = ev.getActionIndex(); 1711 final int idBitsToRemove = 1 << ev.getPointerId(actionIndex); 1712 removePointersFromTouchTargets(idBitsToRemove); 1713 } 1714 } 1715 1716 if (!handled && mInputEventConsistencyVerifier != null) { 1717 mInputEventConsistencyVerifier.onUnhandledEvent(ev, 1); 1718 } 1719 return handled; 1720 } 1721 1722 /** 1723 * Resets all touch state in preparation for a new cycle. 1724 */ 1725 private void resetTouchState() { 1726 clearTouchTargets(); 1727 resetCancelNextUpFlag(this); 1728 mGroupFlags &= ~FLAG_DISALLOW_INTERCEPT; 1729 } 1730 1731 /** 1732 * Resets the cancel next up flag. 1733 * Returns true if the flag was previously set. 1734 */ 1735 private boolean resetCancelNextUpFlag(View view) { 1736 if ((view.mPrivateFlags & CANCEL_NEXT_UP_EVENT) != 0) { 1737 view.mPrivateFlags &= ~CANCEL_NEXT_UP_EVENT; 1738 return true; 1739 } 1740 return false; 1741 } 1742 1743 /** 1744 * Clears all touch targets. 1745 */ 1746 private void clearTouchTargets() { 1747 TouchTarget target = mFirstTouchTarget; 1748 if (target != null) { 1749 do { 1750 TouchTarget next = target.next; 1751 target.recycle(); 1752 target = next; 1753 } while (target != null); 1754 mFirstTouchTarget = null; 1755 } 1756 } 1757 1758 /** 1759 * Cancels and clears all touch targets. 1760 */ 1761 private void cancelAndClearTouchTargets(MotionEvent event) { 1762 if (mFirstTouchTarget != null) { 1763 boolean syntheticEvent = false; 1764 if (event == null) { 1765 final long now = SystemClock.uptimeMillis(); 1766 event = MotionEvent.obtain(now, now, 1767 MotionEvent.ACTION_CANCEL, 0.0f, 0.0f, 0); 1768 event.setSource(InputDevice.SOURCE_TOUCHSCREEN); 1769 syntheticEvent = true; 1770 } 1771 1772 for (TouchTarget target = mFirstTouchTarget; target != null; target = target.next) { 1773 resetCancelNextUpFlag(target.child); 1774 dispatchTransformedTouchEvent(event, true, target.child, target.pointerIdBits); 1775 } 1776 clearTouchTargets(); 1777 1778 if (syntheticEvent) { 1779 event.recycle(); 1780 } 1781 } 1782 } 1783 1784 /** 1785 * Gets the touch target for specified child view. 1786 * Returns null if not found. 1787 */ 1788 private TouchTarget getTouchTarget(View child) { 1789 for (TouchTarget target = mFirstTouchTarget; target != null; target = target.next) { 1790 if (target.child == child) { 1791 return target; 1792 } 1793 } 1794 return null; 1795 } 1796 1797 /** 1798 * Adds a touch target for specified child to the beginning of the list. 1799 * Assumes the target child is not already present. 1800 */ 1801 private TouchTarget addTouchTarget(View child, int pointerIdBits) { 1802 TouchTarget target = TouchTarget.obtain(child, pointerIdBits); 1803 target.next = mFirstTouchTarget; 1804 mFirstTouchTarget = target; 1805 return target; 1806 } 1807 1808 /** 1809 * Removes the pointer ids from consideration. 1810 */ 1811 private void removePointersFromTouchTargets(int pointerIdBits) { 1812 TouchTarget predecessor = null; 1813 TouchTarget target = mFirstTouchTarget; 1814 while (target != null) { 1815 final TouchTarget next = target.next; 1816 if ((target.pointerIdBits & pointerIdBits) != 0) { 1817 target.pointerIdBits &= ~pointerIdBits; 1818 if (target.pointerIdBits == 0) { 1819 if (predecessor == null) { 1820 mFirstTouchTarget = next; 1821 } else { 1822 predecessor.next = next; 1823 } 1824 target.recycle(); 1825 target = next; 1826 continue; 1827 } 1828 } 1829 predecessor = target; 1830 target = next; 1831 } 1832 } 1833 1834 /** 1835 * Returns true if a child view can receive pointer events. 1836 * @hide 1837 */ 1838 private static boolean canViewReceivePointerEvents(View child) { 1839 return (child.mViewFlags & VISIBILITY_MASK) == VISIBLE 1840 || child.getAnimation() != null; 1841 } 1842 1843 /** 1844 * Returns true if a child view contains the specified point when transformed 1845 * into its coordinate space. 1846 * Child must not be null. 1847 * @hide 1848 */ 1849 protected boolean isTransformedTouchPointInView(float x, float y, View child, 1850 PointF outLocalPoint) { 1851 float localX = x + mScrollX - child.mLeft; 1852 float localY = y + mScrollY - child.mTop; 1853 if (! child.hasIdentityMatrix() && mAttachInfo != null) { 1854 final float[] localXY = mAttachInfo.mTmpTransformLocation; 1855 localXY[0] = localX; 1856 localXY[1] = localY; 1857 child.getInverseMatrix().mapPoints(localXY); 1858 localX = localXY[0]; 1859 localY = localXY[1]; 1860 } 1861 final boolean isInView = child.pointInView(localX, localY); 1862 if (isInView && outLocalPoint != null) { 1863 outLocalPoint.set(localX, localY); 1864 } 1865 return isInView; 1866 } 1867 1868 /** 1869 * Transforms a motion event into the coordinate space of a particular child view, 1870 * filters out irrelevant pointer ids, and overrides its action if necessary. 1871 * If child is null, assumes the MotionEvent will be sent to this ViewGroup instead. 1872 */ 1873 private boolean dispatchTransformedTouchEvent(MotionEvent event, boolean cancel, 1874 View child, int desiredPointerIdBits) { 1875 final boolean handled; 1876 1877 // Canceling motions is a special case. We don't need to perform any transformations 1878 // or filtering. The important part is the action, not the contents. 1879 final int oldAction = event.getAction(); 1880 if (cancel || oldAction == MotionEvent.ACTION_CANCEL) { 1881 event.setAction(MotionEvent.ACTION_CANCEL); 1882 if (child == null) { 1883 handled = super.dispatchTouchEvent(event); 1884 } else { 1885 handled = child.dispatchTouchEvent(event); 1886 } 1887 event.setAction(oldAction); 1888 return handled; 1889 } 1890 1891 // Calculate the number of pointers to deliver. 1892 final int oldPointerIdBits = event.getPointerIdBits(); 1893 final int newPointerIdBits = oldPointerIdBits & desiredPointerIdBits; 1894 1895 // If for some reason we ended up in an inconsistent state where it looks like we 1896 // might produce a motion event with no pointers in it, then drop the event. 1897 if (newPointerIdBits == 0) { 1898 return false; 1899 } 1900 1901 // If the number of pointers is the same and we don't need to perform any fancy 1902 // irreversible transformations, then we can reuse the motion event for this 1903 // dispatch as long as we are careful to revert any changes we make. 1904 // Otherwise we need to make a copy. 1905 final MotionEvent transformedEvent; 1906 if (newPointerIdBits == oldPointerIdBits) { 1907 if (child == null || child.hasIdentityMatrix()) { 1908 if (child == null) { 1909 handled = super.dispatchTouchEvent(event); 1910 } else { 1911 final float offsetX = mScrollX - child.mLeft; 1912 final float offsetY = mScrollY - child.mTop; 1913 event.offsetLocation(offsetX, offsetY); 1914 1915 handled = child.dispatchTouchEvent(event); 1916 1917 event.offsetLocation(-offsetX, -offsetY); 1918 } 1919 return handled; 1920 } 1921 transformedEvent = MotionEvent.obtain(event); 1922 } else { 1923 transformedEvent = event.split(newPointerIdBits); 1924 } 1925 1926 // Perform any necessary transformations and dispatch. 1927 if (child == null) { 1928 handled = super.dispatchTouchEvent(transformedEvent); 1929 } else { 1930 final float offsetX = mScrollX - child.mLeft; 1931 final float offsetY = mScrollY - child.mTop; 1932 transformedEvent.offsetLocation(offsetX, offsetY); 1933 if (! child.hasIdentityMatrix()) { 1934 transformedEvent.transform(child.getInverseMatrix()); 1935 } 1936 1937 handled = child.dispatchTouchEvent(transformedEvent); 1938 } 1939 1940 // Done. 1941 transformedEvent.recycle(); 1942 return handled; 1943 } 1944 1945 /** 1946 * Enable or disable the splitting of MotionEvents to multiple children during touch event 1947 * dispatch. This behavior is enabled by default for applications that target an 1948 * SDK version of {@link Build.VERSION_CODES#HONEYCOMB} or newer. 1949 * 1950 * <p>When this option is enabled MotionEvents may be split and dispatched to different child 1951 * views depending on where each pointer initially went down. This allows for user interactions 1952 * such as scrolling two panes of content independently, chording of buttons, and performing 1953 * independent gestures on different pieces of content. 1954 * 1955 * @param split <code>true</code> to allow MotionEvents to be split and dispatched to multiple 1956 * child views. <code>false</code> to only allow one child view to be the target of 1957 * any MotionEvent received by this ViewGroup. 1958 */ 1959 public void setMotionEventSplittingEnabled(boolean split) { 1960 // TODO Applications really shouldn't change this setting mid-touch event, 1961 // but perhaps this should handle that case and send ACTION_CANCELs to any child views 1962 // with gestures in progress when this is changed. 1963 if (split) { 1964 mGroupFlags |= FLAG_SPLIT_MOTION_EVENTS; 1965 } else { 1966 mGroupFlags &= ~FLAG_SPLIT_MOTION_EVENTS; 1967 } 1968 } 1969 1970 /** 1971 * Returns true if MotionEvents dispatched to this ViewGroup can be split to multiple children. 1972 * @return true if MotionEvents dispatched to this ViewGroup can be split to multiple children. 1973 */ 1974 public boolean isMotionEventSplittingEnabled() { 1975 return (mGroupFlags & FLAG_SPLIT_MOTION_EVENTS) == FLAG_SPLIT_MOTION_EVENTS; 1976 } 1977 1978 /** 1979 * {@inheritDoc} 1980 */ 1981 public void requestDisallowInterceptTouchEvent(boolean disallowIntercept) { 1982 1983 if (disallowIntercept == ((mGroupFlags & FLAG_DISALLOW_INTERCEPT) != 0)) { 1984 // We're already in this state, assume our ancestors are too 1985 return; 1986 } 1987 1988 if (disallowIntercept) { 1989 mGroupFlags |= FLAG_DISALLOW_INTERCEPT; 1990 } else { 1991 mGroupFlags &= ~FLAG_DISALLOW_INTERCEPT; 1992 } 1993 1994 // Pass it up to our parent 1995 if (mParent != null) { 1996 mParent.requestDisallowInterceptTouchEvent(disallowIntercept); 1997 } 1998 } 1999 2000 /** 2001 * Implement this method to intercept all touch screen motion events. This 2002 * allows you to watch events as they are dispatched to your children, and 2003 * take ownership of the current gesture at any point. 2004 * 2005 * <p>Using this function takes some care, as it has a fairly complicated 2006 * interaction with {@link View#onTouchEvent(MotionEvent) 2007 * View.onTouchEvent(MotionEvent)}, and using it requires implementing 2008 * that method as well as this one in the correct way. Events will be 2009 * received in the following order: 2010 * 2011 * <ol> 2012 * <li> You will receive the down event here. 2013 * <li> The down event will be handled either by a child of this view 2014 * group, or given to your own onTouchEvent() method to handle; this means 2015 * you should implement onTouchEvent() to return true, so you will 2016 * continue to see the rest of the gesture (instead of looking for 2017 * a parent view to handle it). Also, by returning true from 2018 * onTouchEvent(), you will not receive any following 2019 * events in onInterceptTouchEvent() and all touch processing must 2020 * happen in onTouchEvent() like normal. 2021 * <li> For as long as you return false from this function, each following 2022 * event (up to and including the final up) will be delivered first here 2023 * and then to the target's onTouchEvent(). 2024 * <li> If you return true from here, you will not receive any 2025 * following events: the target view will receive the same event but 2026 * with the action {@link MotionEvent#ACTION_CANCEL}, and all further 2027 * events will be delivered to your onTouchEvent() method and no longer 2028 * appear here. 2029 * </ol> 2030 * 2031 * @param ev The motion event being dispatched down the hierarchy. 2032 * @return Return true to steal motion events from the children and have 2033 * them dispatched to this ViewGroup through onTouchEvent(). 2034 * The current target will receive an ACTION_CANCEL event, and no further 2035 * messages will be delivered here. 2036 */ 2037 public boolean onInterceptTouchEvent(MotionEvent ev) { 2038 return false; 2039 } 2040 2041 /** 2042 * {@inheritDoc} 2043 * 2044 * Looks for a view to give focus to respecting the setting specified by 2045 * {@link #getDescendantFocusability()}. 2046 * 2047 * Uses {@link #onRequestFocusInDescendants(int, android.graphics.Rect)} to 2048 * find focus within the children of this group when appropriate. 2049 * 2050 * @see #FOCUS_BEFORE_DESCENDANTS 2051 * @see #FOCUS_AFTER_DESCENDANTS 2052 * @see #FOCUS_BLOCK_DESCENDANTS 2053 * @see #onRequestFocusInDescendants(int, android.graphics.Rect) 2054 */ 2055 @Override 2056 public boolean requestFocus(int direction, Rect previouslyFocusedRect) { 2057 if (DBG) { 2058 System.out.println(this + " ViewGroup.requestFocus direction=" 2059 + direction); 2060 } 2061 int descendantFocusability = getDescendantFocusability(); 2062 2063 switch (descendantFocusability) { 2064 case FOCUS_BLOCK_DESCENDANTS: 2065 return super.requestFocus(direction, previouslyFocusedRect); 2066 case FOCUS_BEFORE_DESCENDANTS: { 2067 final boolean took = super.requestFocus(direction, previouslyFocusedRect); 2068 return took ? took : onRequestFocusInDescendants(direction, previouslyFocusedRect); 2069 } 2070 case FOCUS_AFTER_DESCENDANTS: { 2071 final boolean took = onRequestFocusInDescendants(direction, previouslyFocusedRect); 2072 return took ? took : super.requestFocus(direction, previouslyFocusedRect); 2073 } 2074 default: 2075 throw new IllegalStateException("descendant focusability must be " 2076 + "one of FOCUS_BEFORE_DESCENDANTS, FOCUS_AFTER_DESCENDANTS, FOCUS_BLOCK_DESCENDANTS " 2077 + "but is " + descendantFocusability); 2078 } 2079 } 2080 2081 /** 2082 * Look for a descendant to call {@link View#requestFocus} on. 2083 * Called by {@link ViewGroup#requestFocus(int, android.graphics.Rect)} 2084 * when it wants to request focus within its children. Override this to 2085 * customize how your {@link ViewGroup} requests focus within its children. 2086 * @param direction One of FOCUS_UP, FOCUS_DOWN, FOCUS_LEFT, and FOCUS_RIGHT 2087 * @param previouslyFocusedRect The rectangle (in this View's coordinate system) 2088 * to give a finer grained hint about where focus is coming from. May be null 2089 * if there is no hint. 2090 * @return Whether focus was taken. 2091 */ 2092 @SuppressWarnings({"ConstantConditions"}) 2093 protected boolean onRequestFocusInDescendants(int direction, 2094 Rect previouslyFocusedRect) { 2095 int index; 2096 int increment; 2097 int end; 2098 int count = mChildrenCount; 2099 if ((direction & FOCUS_FORWARD) != 0) { 2100 index = 0; 2101 increment = 1; 2102 end = count; 2103 } else { 2104 index = count - 1; 2105 increment = -1; 2106 end = -1; 2107 } 2108 final View[] children = mChildren; 2109 for (int i = index; i != end; i += increment) { 2110 View child = children[i]; 2111 if ((child.mViewFlags & VISIBILITY_MASK) == VISIBLE) { 2112 if (child.requestFocus(direction, previouslyFocusedRect)) { 2113 return true; 2114 } 2115 } 2116 } 2117 return false; 2118 } 2119 2120 /** 2121 * {@inheritDoc} 2122 * 2123 * @hide 2124 */ 2125 @Override 2126 public void dispatchStartTemporaryDetach() { 2127 super.dispatchStartTemporaryDetach(); 2128 final int count = mChildrenCount; 2129 final View[] children = mChildren; 2130 for (int i = 0; i < count; i++) { 2131 children[i].dispatchStartTemporaryDetach(); 2132 } 2133 } 2134 2135 /** 2136 * {@inheritDoc} 2137 * 2138 * @hide 2139 */ 2140 @Override 2141 public void dispatchFinishTemporaryDetach() { 2142 super.dispatchFinishTemporaryDetach(); 2143 final int count = mChildrenCount; 2144 final View[] children = mChildren; 2145 for (int i = 0; i < count; i++) { 2146 children[i].dispatchFinishTemporaryDetach(); 2147 } 2148 } 2149 2150 /** 2151 * {@inheritDoc} 2152 */ 2153 @Override 2154 void dispatchAttachedToWindow(AttachInfo info, int visibility) { 2155 super.dispatchAttachedToWindow(info, visibility); 2156 visibility |= mViewFlags & VISIBILITY_MASK; 2157 final int count = mChildrenCount; 2158 final View[] children = mChildren; 2159 for (int i = 0; i < count; i++) { 2160 children[i].dispatchAttachedToWindow(info, visibility); 2161 } 2162 } 2163 2164 @Override 2165 boolean dispatchPopulateAccessibilityEventInternal(AccessibilityEvent event) { 2166 // We first get a chance to populate the event. 2167 super.dispatchPopulateAccessibilityEventInternal(event); 2168 // Let our children have a shot in populating the event. 2169 for (int i = 0, count = getChildCount(); i < count; i++) { 2170 View child = getChildAt(i); 2171 if ((child.mViewFlags & VISIBILITY_MASK) == VISIBLE) { 2172 boolean handled = getChildAt(i).dispatchPopulateAccessibilityEvent(event); 2173 if (handled) { 2174 return handled; 2175 } 2176 } 2177 } 2178 return false; 2179 } 2180 2181 @Override 2182 void onInitializeAccessibilityNodeInfoInternal(AccessibilityNodeInfo info) { 2183 super.onInitializeAccessibilityNodeInfoInternal(info); 2184 // If the view is not the topmost one in the view hierarchy and it is 2185 // marked as the logical root of a view hierarchy, do not go any deeper. 2186 if ((!(getParent() instanceof ViewRootImpl)) && (mPrivateFlags & IS_ROOT_NAMESPACE) != 0) { 2187 return; 2188 } 2189 for (int i = 0, count = mChildrenCount; i < count; i++) { 2190 View child = mChildren[i]; 2191 if ((child.mViewFlags & VISIBILITY_MASK) == VISIBLE) { 2192 info.addChild(child); 2193 } 2194 } 2195 } 2196 2197 /** 2198 * {@inheritDoc} 2199 */ 2200 @Override 2201 void dispatchDetachedFromWindow() { 2202 // If we still have a touch target, we are still in the process of 2203 // dispatching motion events to a child; we need to get rid of that 2204 // child to avoid dispatching events to it after the window is torn 2205 // down. To make sure we keep the child in a consistent state, we 2206 // first send it an ACTION_CANCEL motion event. 2207 cancelAndClearTouchTargets(null); 2208 2209 // In case view is detached while transition is running 2210 mLayoutSuppressed = false; 2211 2212 // Tear down our drag tracking 2213 mDragNotifiedChildren = null; 2214 if (mCurrentDrag != null) { 2215 mCurrentDrag.recycle(); 2216 mCurrentDrag = null; 2217 } 2218 2219 final int count = mChildrenCount; 2220 final View[] children = mChildren; 2221 for (int i = 0; i < count; i++) { 2222 children[i].dispatchDetachedFromWindow(); 2223 } 2224 super.dispatchDetachedFromWindow(); 2225 } 2226 2227 /** 2228 * {@inheritDoc} 2229 */ 2230 @Override 2231 public void setPadding(int left, int top, int right, int bottom) { 2232 super.setPadding(left, top, right, bottom); 2233 2234 if ((mPaddingLeft | mPaddingTop | mPaddingRight | mPaddingBottom) != 0) { 2235 mGroupFlags |= FLAG_PADDING_NOT_NULL; 2236 } else { 2237 mGroupFlags &= ~FLAG_PADDING_NOT_NULL; 2238 } 2239 } 2240 2241 /** 2242 * {@inheritDoc} 2243 */ 2244 @Override 2245 protected void dispatchSaveInstanceState(SparseArray<Parcelable> container) { 2246 super.dispatchSaveInstanceState(container); 2247 final int count = mChildrenCount; 2248 final View[] children = mChildren; 2249 for (int i = 0; i < count; i++) { 2250 View c = children[i]; 2251 if ((c.mViewFlags & PARENT_SAVE_DISABLED_MASK) != PARENT_SAVE_DISABLED) { 2252 c.dispatchSaveInstanceState(container); 2253 } 2254 } 2255 } 2256 2257 /** 2258 * Perform dispatching of a {@link #saveHierarchyState(android.util.SparseArray)} freeze()} 2259 * to only this view, not to its children. For use when overriding 2260 * {@link #dispatchSaveInstanceState(android.util.SparseArray)} dispatchFreeze()} to allow 2261 * subclasses to freeze their own state but not the state of their children. 2262 * 2263 * @param container the container 2264 */ 2265 protected void dispatchFreezeSelfOnly(SparseArray<Parcelable> container) { 2266 super.dispatchSaveInstanceState(container); 2267 } 2268 2269 /** 2270 * {@inheritDoc} 2271 */ 2272 @Override 2273 protected void dispatchRestoreInstanceState(SparseArray<Parcelable> container) { 2274 super.dispatchRestoreInstanceState(container); 2275 final int count = mChildrenCount; 2276 final View[] children = mChildren; 2277 for (int i = 0; i < count; i++) { 2278 View c = children[i]; 2279 if ((c.mViewFlags & PARENT_SAVE_DISABLED_MASK) != PARENT_SAVE_DISABLED) { 2280 c.dispatchRestoreInstanceState(container); 2281 } 2282 } 2283 } 2284 2285 /** 2286 * Perform dispatching of a {@link #restoreHierarchyState(android.util.SparseArray)} 2287 * to only this view, not to its children. For use when overriding 2288 * {@link #dispatchRestoreInstanceState(android.util.SparseArray)} to allow 2289 * subclasses to thaw their own state but not the state of their children. 2290 * 2291 * @param container the container 2292 */ 2293 protected void dispatchThawSelfOnly(SparseArray<Parcelable> container) { 2294 super.dispatchRestoreInstanceState(container); 2295 } 2296 2297 /** 2298 * Enables or disables the drawing cache for each child of this view group. 2299 * 2300 * @param enabled true to enable the cache, false to dispose of it 2301 */ 2302 protected void setChildrenDrawingCacheEnabled(boolean enabled) { 2303 if (enabled || (mPersistentDrawingCache & PERSISTENT_ALL_CACHES) != PERSISTENT_ALL_CACHES) { 2304 final View[] children = mChildren; 2305 final int count = mChildrenCount; 2306 for (int i = 0; i < count; i++) { 2307 children[i].setDrawingCacheEnabled(enabled); 2308 } 2309 } 2310 } 2311 2312 @Override 2313 protected void onAnimationStart() { 2314 super.onAnimationStart(); 2315 2316 // When this ViewGroup's animation starts, build the cache for the children 2317 if ((mGroupFlags & FLAG_ANIMATION_CACHE) == FLAG_ANIMATION_CACHE) { 2318 final int count = mChildrenCount; 2319 final View[] children = mChildren; 2320 final boolean buildCache = !isHardwareAccelerated(); 2321 2322 for (int i = 0; i < count; i++) { 2323 final View child = children[i]; 2324 if ((child.mViewFlags & VISIBILITY_MASK) == VISIBLE) { 2325 child.setDrawingCacheEnabled(true); 2326 if (buildCache) { 2327 child.buildDrawingCache(true); 2328 } 2329 } 2330 } 2331 2332 mGroupFlags |= FLAG_CHILDREN_DRAWN_WITH_CACHE; 2333 } 2334 } 2335 2336 @Override 2337 protected void onAnimationEnd() { 2338 super.onAnimationEnd(); 2339 2340 // When this ViewGroup's animation ends, destroy the cache of the children 2341 if ((mGroupFlags & FLAG_ANIMATION_CACHE) == FLAG_ANIMATION_CACHE) { 2342 mGroupFlags &= ~FLAG_CHILDREN_DRAWN_WITH_CACHE; 2343 2344 if ((mPersistentDrawingCache & PERSISTENT_ANIMATION_CACHE) == 0) { 2345 setChildrenDrawingCacheEnabled(false); 2346 } 2347 } 2348 } 2349 2350 @Override 2351 Bitmap createSnapshot(Bitmap.Config quality, int backgroundColor, boolean skipChildren) { 2352 int count = mChildrenCount; 2353 int[] visibilities = null; 2354 2355 if (skipChildren) { 2356 visibilities = new int[count]; 2357 for (int i = 0; i < count; i++) { 2358 View child = getChildAt(i); 2359 visibilities[i] = child.getVisibility(); 2360 if (visibilities[i] == View.VISIBLE) { 2361 child.setVisibility(INVISIBLE); 2362 } 2363 } 2364 } 2365 2366 Bitmap b = super.createSnapshot(quality, backgroundColor, skipChildren); 2367 2368 if (skipChildren) { 2369 for (int i = 0; i < count; i++) { 2370 getChildAt(i).setVisibility(visibilities[i]); 2371 } 2372 } 2373 2374 return b; 2375 } 2376 2377 /** 2378 * {@inheritDoc} 2379 */ 2380 @Override 2381 protected void dispatchDraw(Canvas canvas) { 2382 final int count = mChildrenCount; 2383 final View[] children = mChildren; 2384 int flags = mGroupFlags; 2385 2386 if ((flags & FLAG_RUN_ANIMATION) != 0 && canAnimate()) { 2387 final boolean cache = (mGroupFlags & FLAG_ANIMATION_CACHE) == FLAG_ANIMATION_CACHE; 2388 2389 final boolean buildCache = !isHardwareAccelerated(); 2390 for (int i = 0; i < count; i++) { 2391 final View child = children[i]; 2392 if ((child.mViewFlags & VISIBILITY_MASK) == VISIBLE) { 2393 final LayoutParams params = child.getLayoutParams(); 2394 attachLayoutAnimationParameters(child, params, i, count); 2395 bindLayoutAnimation(child); 2396 if (cache) { 2397 child.setDrawingCacheEnabled(true); 2398 if (buildCache) { 2399 child.buildDrawingCache(true); 2400 } 2401 } 2402 } 2403 } 2404 2405 final LayoutAnimationController controller = mLayoutAnimationController; 2406 if (controller.willOverlap()) { 2407 mGroupFlags |= FLAG_OPTIMIZE_INVALIDATE; 2408 } 2409 2410 controller.start(); 2411 2412 mGroupFlags &= ~FLAG_RUN_ANIMATION; 2413 mGroupFlags &= ~FLAG_ANIMATION_DONE; 2414 2415 if (cache) { 2416 mGroupFlags |= FLAG_CHILDREN_DRAWN_WITH_CACHE; 2417 } 2418 2419 if (mAnimationListener != null) { 2420 mAnimationListener.onAnimationStart(controller.getAnimation()); 2421 } 2422 } 2423 2424 int saveCount = 0; 2425 final boolean clipToPadding = (flags & CLIP_TO_PADDING_MASK) == CLIP_TO_PADDING_MASK; 2426 if (clipToPadding) { 2427 saveCount = canvas.save(); 2428 canvas.clipRect(mScrollX + mPaddingLeft, mScrollY + mPaddingTop, 2429 mScrollX + mRight - mLeft - mPaddingRight, 2430 mScrollY + mBottom - mTop - mPaddingBottom); 2431 2432 } 2433 2434 // We will draw our child's animation, let's reset the flag 2435 mPrivateFlags &= ~DRAW_ANIMATION; 2436 mGroupFlags &= ~FLAG_INVALIDATE_REQUIRED; 2437 2438 boolean more = false; 2439 final long drawingTime = getDrawingTime(); 2440 2441 if ((flags & FLAG_USE_CHILD_DRAWING_ORDER) == 0) { 2442 for (int i = 0; i < count; i++) { 2443 final View child = children[i]; 2444 if ((child.mViewFlags & VISIBILITY_MASK) == VISIBLE || child.getAnimation() != null) { 2445 more |= drawChild(canvas, child, drawingTime); 2446 } 2447 } 2448 } else { 2449 for (int i = 0; i < count; i++) { 2450 final View child = children[getChildDrawingOrder(count, i)]; 2451 if ((child.mViewFlags & VISIBILITY_MASK) == VISIBLE || child.getAnimation() != null) { 2452 more |= drawChild(canvas, child, drawingTime); 2453 } 2454 } 2455 } 2456 2457 // Draw any disappearing views that have animations 2458 if (mDisappearingChildren != null) { 2459 final ArrayList<View> disappearingChildren = mDisappearingChildren; 2460 final int disappearingCount = disappearingChildren.size() - 1; 2461 // Go backwards -- we may delete as animations finish 2462 for (int i = disappearingCount; i >= 0; i--) { 2463 final View child = disappearingChildren.get(i); 2464 more |= drawChild(canvas, child, drawingTime); 2465 } 2466 } 2467 2468 if (clipToPadding) { 2469 canvas.restoreToCount(saveCount); 2470 } 2471 2472 // mGroupFlags might have been updated by drawChild() 2473 flags = mGroupFlags; 2474 2475 if ((flags & FLAG_INVALIDATE_REQUIRED) == FLAG_INVALIDATE_REQUIRED) { 2476 invalidate(true); 2477 } 2478 2479 if ((flags & FLAG_ANIMATION_DONE) == 0 && (flags & FLAG_NOTIFY_ANIMATION_LISTENER) == 0 && 2480 mLayoutAnimationController.isDone() && !more) { 2481 // We want to erase the drawing cache and notify the listener after the 2482 // next frame is drawn because one extra invalidate() is caused by 2483 // drawChild() after the animation is over 2484 mGroupFlags |= FLAG_NOTIFY_ANIMATION_LISTENER; 2485 final Runnable end = new Runnable() { 2486 public void run() { 2487 notifyAnimationListener(); 2488 } 2489 }; 2490 post(end); 2491 } 2492 } 2493 2494 /** 2495 * Returns the index of the child to draw for this iteration. Override this 2496 * if you want to change the drawing order of children. By default, it 2497 * returns i. 2498 * <p> 2499 * NOTE: In order for this method to be called, you must enable child ordering 2500 * first by calling {@link #setChildrenDrawingOrderEnabled(boolean)}. 2501 * 2502 * @param i The current iteration. 2503 * @return The index of the child to draw this iteration. 2504 * 2505 * @see #setChildrenDrawingOrderEnabled(boolean) 2506 * @see #isChildrenDrawingOrderEnabled() 2507 */ 2508 protected int getChildDrawingOrder(int childCount, int i) { 2509 return i; 2510 } 2511 2512 private void notifyAnimationListener() { 2513 mGroupFlags &= ~FLAG_NOTIFY_ANIMATION_LISTENER; 2514 mGroupFlags |= FLAG_ANIMATION_DONE; 2515 2516 if (mAnimationListener != null) { 2517 final Runnable end = new Runnable() { 2518 public void run() { 2519 mAnimationListener.onAnimationEnd(mLayoutAnimationController.getAnimation()); 2520 } 2521 }; 2522 post(end); 2523 } 2524 2525 if ((mGroupFlags & FLAG_ANIMATION_CACHE) == FLAG_ANIMATION_CACHE) { 2526 mGroupFlags &= ~FLAG_CHILDREN_DRAWN_WITH_CACHE; 2527 if ((mPersistentDrawingCache & PERSISTENT_ANIMATION_CACHE) == 0) { 2528 setChildrenDrawingCacheEnabled(false); 2529 } 2530 } 2531 2532 invalidate(true); 2533 } 2534 2535 /** 2536 * This method is used to cause children of this ViewGroup to restore or recreate their 2537 * display lists. It is called by getDisplayList() when the parent ViewGroup does not need 2538 * to recreate its own display list, which would happen if it went through the normal 2539 * draw/dispatchDraw mechanisms. 2540 * 2541 * @hide 2542 */ 2543 @Override 2544 protected void dispatchGetDisplayList() { 2545 final int count = mChildrenCount; 2546 final View[] children = mChildren; 2547 for (int i = 0; i < count; i++) { 2548 final View child = children[i]; 2549 if ((child.mViewFlags & VISIBILITY_MASK) == VISIBLE || child.getAnimation() != null) { 2550 child.mRecreateDisplayList = (child.mPrivateFlags & INVALIDATED) == INVALIDATED; 2551 child.mPrivateFlags &= ~INVALIDATED; 2552 child.getDisplayList(); 2553 child.mRecreateDisplayList = false; 2554 } 2555 } 2556 } 2557 2558 /** 2559 * Draw one child of this View Group. This method is responsible for getting 2560 * the canvas in the right state. This includes clipping, translating so 2561 * that the child's scrolled origin is at 0, 0, and applying any animation 2562 * transformations. 2563 * 2564 * @param canvas The canvas on which to draw the child 2565 * @param child Who to draw 2566 * @param drawingTime The time at which draw is occuring 2567 * @return True if an invalidate() was issued 2568 */ 2569 protected boolean drawChild(Canvas canvas, View child, long drawingTime) { 2570 boolean more = false; 2571 2572 final int cl = child.mLeft; 2573 final int ct = child.mTop; 2574 final int cr = child.mRight; 2575 final int cb = child.mBottom; 2576 2577 final boolean childHasIdentityMatrix = child.hasIdentityMatrix(); 2578 2579 final int flags = mGroupFlags; 2580 2581 if ((flags & FLAG_CLEAR_TRANSFORMATION) == FLAG_CLEAR_TRANSFORMATION) { 2582 mChildTransformation.clear(); 2583 mGroupFlags &= ~FLAG_CLEAR_TRANSFORMATION; 2584 } 2585 2586 Transformation transformToApply = null; 2587 Transformation invalidationTransform; 2588 final Animation a = child.getAnimation(); 2589 boolean concatMatrix = false; 2590 2591 boolean scalingRequired = false; 2592 boolean caching; 2593 int layerType = mDrawLayers ? child.getLayerType() : LAYER_TYPE_NONE; 2594 2595 final boolean hardwareAccelerated = canvas.isHardwareAccelerated(); 2596 if ((flags & FLAG_CHILDREN_DRAWN_WITH_CACHE) == FLAG_CHILDREN_DRAWN_WITH_CACHE || 2597 (flags & FLAG_ALWAYS_DRAWN_WITH_CACHE) == FLAG_ALWAYS_DRAWN_WITH_CACHE) { 2598 caching = true; 2599 if (mAttachInfo != null) scalingRequired = mAttachInfo.mScalingRequired; 2600 } else { 2601 caching = (layerType != LAYER_TYPE_NONE) || hardwareAccelerated; 2602 } 2603 2604 if (a != null) { 2605 final boolean initialized = a.isInitialized(); 2606 if (!initialized) { 2607 a.initialize(cr - cl, cb - ct, getWidth(), getHeight()); 2608 a.initializeInvalidateRegion(0, 0, cr - cl, cb - ct); 2609 child.onAnimationStart(); 2610 } 2611 2612 more = a.getTransformation(drawingTime, mChildTransformation, 2613 scalingRequired ? mAttachInfo.mApplicationScale : 1f); 2614 if (scalingRequired && mAttachInfo.mApplicationScale != 1f) { 2615 if (mInvalidationTransformation == null) { 2616 mInvalidationTransformation = new Transformation(); 2617 } 2618 invalidationTransform = mInvalidationTransformation; 2619 a.getTransformation(drawingTime, invalidationTransform, 1f); 2620 } else { 2621 invalidationTransform = mChildTransformation; 2622 } 2623 transformToApply = mChildTransformation; 2624 2625 concatMatrix = a.willChangeTransformationMatrix(); 2626 2627 if (more) { 2628 if (!a.willChangeBounds()) { 2629 if ((flags & (FLAG_OPTIMIZE_INVALIDATE | FLAG_ANIMATION_DONE)) == 2630 FLAG_OPTIMIZE_INVALIDATE) { 2631 mGroupFlags |= FLAG_INVALIDATE_REQUIRED; 2632 } else if ((flags & FLAG_INVALIDATE_REQUIRED) == 0) { 2633 // The child need to draw an animation, potentially offscreen, so 2634 // make sure we do not cancel invalidate requests 2635 mPrivateFlags |= DRAW_ANIMATION; 2636 invalidate(cl, ct, cr, cb); 2637 } 2638 } else { 2639 if (mInvalidateRegion == null) { 2640 mInvalidateRegion = new RectF(); 2641 } 2642 final RectF region = mInvalidateRegion; 2643 a.getInvalidateRegion(0, 0, cr - cl, cb - ct, region, invalidationTransform); 2644 2645 // The child need to draw an animation, potentially offscreen, so 2646 // make sure we do not cancel invalidate requests 2647 mPrivateFlags |= DRAW_ANIMATION; 2648 2649 final int left = cl + (int) region.left; 2650 final int top = ct + (int) region.top; 2651 invalidate(left, top, left + (int) (region.width() + .5f), 2652 top + (int) (region.height() + .5f)); 2653 } 2654 } 2655 } else if ((flags & FLAG_SUPPORT_STATIC_TRANSFORMATIONS) == 2656 FLAG_SUPPORT_STATIC_TRANSFORMATIONS) { 2657 final boolean hasTransform = getChildStaticTransformation(child, mChildTransformation); 2658 if (hasTransform) { 2659 final int transformType = mChildTransformation.getTransformationType(); 2660 transformToApply = transformType != Transformation.TYPE_IDENTITY ? 2661 mChildTransformation : null; 2662 concatMatrix = (transformType & Transformation.TYPE_MATRIX) != 0; 2663 } 2664 } 2665 2666 concatMatrix |= !childHasIdentityMatrix; 2667 2668 // Sets the flag as early as possible to allow draw() implementations 2669 // to call invalidate() successfully when doing animations 2670 child.mPrivateFlags |= DRAWN; 2671 2672 if (!concatMatrix && canvas.quickReject(cl, ct, cr, cb, Canvas.EdgeType.BW) && 2673 (child.mPrivateFlags & DRAW_ANIMATION) == 0) { 2674 return more; 2675 } 2676 2677 float alpha = child.getAlpha(); 2678 // Bail out early if the view does not need to be drawn 2679 if (alpha <= ViewConfiguration.ALPHA_THRESHOLD && (child.mPrivateFlags & ALPHA_SET) == 0 && 2680 !(child instanceof SurfaceView)) { 2681 return more; 2682 } 2683 2684 if (hardwareAccelerated) { 2685 // Clear INVALIDATED flag to allow invalidation to occur during rendering, but 2686 // retain the flag's value temporarily in the mRecreateDisplayList flag 2687 child.mRecreateDisplayList = (child.mPrivateFlags & INVALIDATED) == INVALIDATED; 2688 child.mPrivateFlags &= ~INVALIDATED; 2689 } 2690 2691 child.computeScroll(); 2692 2693 final int sx = child.mScrollX; 2694 final int sy = child.mScrollY; 2695 2696 DisplayList displayList = null; 2697 Bitmap cache = null; 2698 boolean hasDisplayList = false; 2699 if (caching) { 2700 if (!hardwareAccelerated) { 2701 if (layerType != LAYER_TYPE_NONE) { 2702 layerType = LAYER_TYPE_SOFTWARE; 2703 child.buildDrawingCache(true); 2704 } 2705 cache = child.getDrawingCache(true); 2706 } else { 2707 switch (layerType) { 2708 case LAYER_TYPE_SOFTWARE: 2709 child.buildDrawingCache(true); 2710 cache = child.getDrawingCache(true); 2711 break; 2712 case LAYER_TYPE_NONE: 2713 // Delay getting the display list until animation-driven alpha values are 2714 // set up and possibly passed on to the view 2715 hasDisplayList = child.canHaveDisplayList(); 2716 break; 2717 } 2718 } 2719 } 2720 2721 final boolean hasNoCache = cache == null || hasDisplayList; 2722 final boolean offsetForScroll = cache == null && !hasDisplayList && 2723 layerType != LAYER_TYPE_HARDWARE; 2724 2725 final int restoreTo = canvas.save(); 2726 if (offsetForScroll) { 2727 canvas.translate(cl - sx, ct - sy); 2728 } else { 2729 canvas.translate(cl, ct); 2730 if (scalingRequired) { 2731 // mAttachInfo cannot be null, otherwise scalingRequired == false 2732 final float scale = 1.0f / mAttachInfo.mApplicationScale; 2733 canvas.scale(scale, scale); 2734 } 2735 } 2736 2737 if (transformToApply != null || alpha < 1.0f || !child.hasIdentityMatrix()) { 2738 if (transformToApply != null || !childHasIdentityMatrix) { 2739 int transX = 0; 2740 int transY = 0; 2741 2742 if (offsetForScroll) { 2743 transX = -sx; 2744 transY = -sy; 2745 } 2746 2747 if (transformToApply != null) { 2748 if (concatMatrix) { 2749 // Undo the scroll translation, apply the transformation matrix, 2750 // then redo the scroll translate to get the correct result. 2751 canvas.translate(-transX, -transY); 2752 canvas.concat(transformToApply.getMatrix()); 2753 canvas.translate(transX, transY); 2754 mGroupFlags |= FLAG_CLEAR_TRANSFORMATION; 2755 } 2756 2757 float transformAlpha = transformToApply.getAlpha(); 2758 if (transformAlpha < 1.0f) { 2759 alpha *= transformToApply.getAlpha(); 2760 mGroupFlags |= FLAG_CLEAR_TRANSFORMATION; 2761 } 2762 } 2763 2764 if (!childHasIdentityMatrix) { 2765 canvas.translate(-transX, -transY); 2766 canvas.concat(child.getMatrix()); 2767 canvas.translate(transX, transY); 2768 } 2769 } 2770 2771 if (alpha < 1.0f) { 2772 mGroupFlags |= FLAG_CLEAR_TRANSFORMATION; 2773 if (hasNoCache) { 2774 final int multipliedAlpha = (int) (255 * alpha); 2775 if (!child.onSetAlpha(multipliedAlpha)) { 2776 int layerFlags = Canvas.HAS_ALPHA_LAYER_SAVE_FLAG; 2777 if ((flags & FLAG_CLIP_CHILDREN) == FLAG_CLIP_CHILDREN || 2778 layerType != LAYER_TYPE_NONE) { 2779 layerFlags |= Canvas.CLIP_TO_LAYER_SAVE_FLAG; 2780 } 2781 if (layerType == LAYER_TYPE_NONE) { 2782 final int scrollX = hasDisplayList ? 0 : sx; 2783 final int scrollY = hasDisplayList ? 0 : sy; 2784 canvas.saveLayerAlpha(scrollX, scrollY, scrollX + cr - cl, 2785 scrollY + cb - ct, multipliedAlpha, layerFlags); 2786 } 2787 } else { 2788 // Alpha is handled by the child directly, clobber the layer's alpha 2789 child.mPrivateFlags |= ALPHA_SET; 2790 } 2791 } 2792 } 2793 } else if ((child.mPrivateFlags & ALPHA_SET) == ALPHA_SET) { 2794 child.onSetAlpha(255); 2795 child.mPrivateFlags &= ~ALPHA_SET; 2796 } 2797 2798 if ((flags & FLAG_CLIP_CHILDREN) == FLAG_CLIP_CHILDREN) { 2799 if (offsetForScroll) { 2800 canvas.clipRect(sx, sy, sx + (cr - cl), sy + (cb - ct)); 2801 } else { 2802 if (!scalingRequired || cache == null) { 2803 canvas.clipRect(0, 0, cr - cl, cb - ct); 2804 } else { 2805 canvas.clipRect(0, 0, cache.getWidth(), cache.getHeight()); 2806 } 2807 } 2808 } 2809 2810 if (hasDisplayList) { 2811 displayList = child.getDisplayList(); 2812 } 2813 2814 if (hasNoCache) { 2815 boolean layerRendered = false; 2816 if (layerType == LAYER_TYPE_HARDWARE) { 2817 final HardwareLayer layer = child.getHardwareLayer(); 2818 if (layer != null && layer.isValid()) { 2819 child.mLayerPaint.setAlpha((int) (alpha * 255)); 2820 ((HardwareCanvas) canvas).drawHardwareLayer(layer, 0, 0, child.mLayerPaint); 2821 layerRendered = true; 2822 } else { 2823 final int scrollX = hasDisplayList ? 0 : sx; 2824 final int scrollY = hasDisplayList ? 0 : sy; 2825 canvas.saveLayer(scrollX, scrollY, 2826 scrollX + cr - cl, scrollY + cb - ct, child.mLayerPaint, 2827 Canvas.HAS_ALPHA_LAYER_SAVE_FLAG | Canvas.CLIP_TO_LAYER_SAVE_FLAG); 2828 } 2829 } 2830 2831 if (!layerRendered) { 2832 if (!hasDisplayList) { 2833 // Fast path for layouts with no backgrounds 2834 if ((child.mPrivateFlags & SKIP_DRAW) == SKIP_DRAW) { 2835 if (ViewDebug.TRACE_HIERARCHY) { 2836 ViewDebug.trace(this, ViewDebug.HierarchyTraceType.DRAW); 2837 } 2838 child.mPrivateFlags &= ~DIRTY_MASK; 2839 child.dispatchDraw(canvas); 2840 } else { 2841 child.draw(canvas); 2842 } 2843 } else { 2844 child.mPrivateFlags &= ~DIRTY_MASK; 2845 ((HardwareCanvas) canvas).drawDisplayList(displayList, cr - cl, cb - ct, null); 2846 } 2847 } 2848 } else if (cache != null) { 2849 child.mPrivateFlags &= ~DIRTY_MASK; 2850 Paint cachePaint; 2851 2852 if (layerType == LAYER_TYPE_NONE) { 2853 cachePaint = mCachePaint; 2854 if (alpha < 1.0f) { 2855 cachePaint.setAlpha((int) (alpha * 255)); 2856 mGroupFlags |= FLAG_ALPHA_LOWER_THAN_ONE; 2857 } else if ((flags & FLAG_ALPHA_LOWER_THAN_ONE) == FLAG_ALPHA_LOWER_THAN_ONE) { 2858 cachePaint.setAlpha(255); 2859 mGroupFlags &= ~FLAG_ALPHA_LOWER_THAN_ONE; 2860 } 2861 } else { 2862 cachePaint = child.mLayerPaint; 2863 cachePaint.setAlpha((int) (alpha * 255)); 2864 } 2865 canvas.drawBitmap(cache, 0.0f, 0.0f, cachePaint); 2866 } 2867 2868 canvas.restoreToCount(restoreTo); 2869 2870 if (a != null && !more) { 2871 if (!hardwareAccelerated && !a.getFillAfter()) { 2872 child.onSetAlpha(255); 2873 } 2874 finishAnimatingView(child, a); 2875 } 2876 2877 if (more && hardwareAccelerated) { 2878 // invalidation is the trigger to recreate display lists, so if we're using 2879 // display lists to render, force an invalidate to allow the animation to 2880 // continue drawing another frame 2881 invalidate(true); 2882 if (a.hasAlpha() && (child.mPrivateFlags & ALPHA_SET) == ALPHA_SET) { 2883 // alpha animations should cause the child to recreate its display list 2884 child.invalidate(true); 2885 } 2886 } 2887 2888 child.mRecreateDisplayList = false; 2889 2890 return more; 2891 } 2892 2893 /** 2894 * 2895 * @param enabled True if children should be drawn with layers, false otherwise. 2896 * 2897 * @hide 2898 */ 2899 public void setChildrenLayersEnabled(boolean enabled) { 2900 if (enabled != mDrawLayers) { 2901 mDrawLayers = enabled; 2902 invalidate(true); 2903 2904 // We need to invalidate any child with a layer. For instance, 2905 // if a child is backed by a hardware layer and we disable layers 2906 // the child is marked as not dirty (flags cleared the last time 2907 // the child was drawn inside its layer.) However, that child might 2908 // never have created its own display list or have an obsolete 2909 // display list. By invalidating the child we ensure the display 2910 // list is in sync with the content of the hardware layer. 2911 for (int i = 0; i < mChildrenCount; i++) { 2912 View child = mChildren[i]; 2913 if (child.mLayerType != LAYER_TYPE_NONE) { 2914 child.invalidate(true); 2915 } 2916 } 2917 } 2918 } 2919 2920 /** 2921 * By default, children are clipped to their bounds before drawing. This 2922 * allows view groups to override this behavior for animations, etc. 2923 * 2924 * @param clipChildren true to clip children to their bounds, 2925 * false otherwise 2926 * @attr ref android.R.styleable#ViewGroup_clipChildren 2927 */ 2928 public void setClipChildren(boolean clipChildren) { 2929 setBooleanFlag(FLAG_CLIP_CHILDREN, clipChildren); 2930 } 2931 2932 /** 2933 * By default, children are clipped to the padding of the ViewGroup. This 2934 * allows view groups to override this behavior 2935 * 2936 * @param clipToPadding true to clip children to the padding of the 2937 * group, false otherwise 2938 * @attr ref android.R.styleable#ViewGroup_clipToPadding 2939 */ 2940 public void setClipToPadding(boolean clipToPadding) { 2941 setBooleanFlag(FLAG_CLIP_TO_PADDING, clipToPadding); 2942 } 2943 2944 /** 2945 * {@inheritDoc} 2946 */ 2947 @Override 2948 public void dispatchSetSelected(boolean selected) { 2949 final View[] children = mChildren; 2950 final int count = mChildrenCount; 2951 for (int i = 0; i < count; i++) { 2952 children[i].setSelected(selected); 2953 } 2954 } 2955 2956 /** 2957 * {@inheritDoc} 2958 */ 2959 @Override 2960 public void dispatchSetActivated(boolean activated) { 2961 final View[] children = mChildren; 2962 final int count = mChildrenCount; 2963 for (int i = 0; i < count; i++) { 2964 children[i].setActivated(activated); 2965 } 2966 } 2967 2968 @Override 2969 protected void dispatchSetPressed(boolean pressed) { 2970 final View[] children = mChildren; 2971 final int count = mChildrenCount; 2972 for (int i = 0; i < count; i++) { 2973 children[i].setPressed(pressed); 2974 } 2975 } 2976 2977 /** 2978 * When this property is set to true, this ViewGroup supports static transformations on 2979 * children; this causes 2980 * {@link #getChildStaticTransformation(View, android.view.animation.Transformation)} to be 2981 * invoked when a child is drawn. 2982 * 2983 * Any subclass overriding 2984 * {@link #getChildStaticTransformation(View, android.view.animation.Transformation)} should 2985 * set this property to true. 2986 * 2987 * @param enabled True to enable static transformations on children, false otherwise. 2988 * 2989 * @see #FLAG_SUPPORT_STATIC_TRANSFORMATIONS 2990 */ 2991 protected void setStaticTransformationsEnabled(boolean enabled) { 2992 setBooleanFlag(FLAG_SUPPORT_STATIC_TRANSFORMATIONS, enabled); 2993 } 2994 2995 /** 2996 * {@inheritDoc} 2997 * 2998 * @see #setStaticTransformationsEnabled(boolean) 2999 */ 3000 protected boolean getChildStaticTransformation(View child, Transformation t) { 3001 return false; 3002 } 3003 3004 /** 3005 * {@hide} 3006 */ 3007 @Override 3008 protected View findViewTraversal(int id) { 3009 if (id == mID) { 3010 return this; 3011 } 3012 3013 final View[] where = mChildren; 3014 final int len = mChildrenCount; 3015 3016 for (int i = 0; i < len; i++) { 3017 View v = where[i]; 3018 3019 if ((v.mPrivateFlags & IS_ROOT_NAMESPACE) == 0) { 3020 v = v.findViewById(id); 3021 3022 if (v != null) { 3023 return v; 3024 } 3025 } 3026 } 3027 3028 return null; 3029 } 3030 3031 /** 3032 * {@hide} 3033 */ 3034 @Override 3035 protected View findViewWithTagTraversal(Object tag) { 3036 if (tag != null && tag.equals(mTag)) { 3037 return this; 3038 } 3039 3040 final View[] where = mChildren; 3041 final int len = mChildrenCount; 3042 3043 for (int i = 0; i < len; i++) { 3044 View v = where[i]; 3045 3046 if ((v.mPrivateFlags & IS_ROOT_NAMESPACE) == 0) { 3047 v = v.findViewWithTag(tag); 3048 3049 if (v != null) { 3050 return v; 3051 } 3052 } 3053 } 3054 3055 return null; 3056 } 3057 3058 /** 3059 * {@hide} 3060 */ 3061 @Override 3062 protected View findViewByPredicateTraversal(Predicate<View> predicate, View childToSkip) { 3063 if (predicate.apply(this)) { 3064 return this; 3065 } 3066 3067 final View[] where = mChildren; 3068 final int len = mChildrenCount; 3069 3070 for (int i = 0; i < len; i++) { 3071 View v = where[i]; 3072 3073 if (v != childToSkip && (v.mPrivateFlags & IS_ROOT_NAMESPACE) == 0) { 3074 v = v.findViewByPredicate(predicate); 3075 3076 if (v != null) { 3077 return v; 3078 } 3079 } 3080 } 3081 3082 return null; 3083 } 3084 3085 /** 3086 * Adds a child view. If no layout parameters are already set on the child, the 3087 * default parameters for this ViewGroup are set on the child. 3088 * 3089 * @param child the child view to add 3090 * 3091 * @see #generateDefaultLayoutParams() 3092 */ 3093 public void addView(View child) { 3094 addView(child, -1); 3095 } 3096 3097 /** 3098 * Adds a child view. If no layout parameters are already set on the child, the 3099 * default parameters for this ViewGroup are set on the child. 3100 * 3101 * @param child the child view to add 3102 * @param index the position at which to add the child 3103 * 3104 * @see #generateDefaultLayoutParams() 3105 */ 3106 public void addView(View child, int index) { 3107 LayoutParams params = child.getLayoutParams(); 3108 if (params == null) { 3109 params = generateDefaultLayoutParams(); 3110 if (params == null) { 3111 throw new IllegalArgumentException("generateDefaultLayoutParams() cannot return null"); 3112 } 3113 } 3114 addView(child, index, params); 3115 } 3116 3117 /** 3118 * Adds a child view with this ViewGroup's default layout parameters and the 3119 * specified width and height. 3120 * 3121 * @param child the child view to add 3122 */ 3123 public void addView(View child, int width, int height) { 3124 final LayoutParams params = generateDefaultLayoutParams(); 3125 params.width = width; 3126 params.height = height; 3127 addView(child, -1, params); 3128 } 3129 3130 /** 3131 * Adds a child view with the specified layout parameters. 3132 * 3133 * @param child the child view to add 3134 * @param params the layout parameters to set on the child 3135 */ 3136 public void addView(View child, LayoutParams params) { 3137 addView(child, -1, params); 3138 } 3139 3140 /** 3141 * Adds a child view with the specified layout parameters. 3142 * 3143 * @param child the child view to add 3144 * @param index the position at which to add the child 3145 * @param params the layout parameters to set on the child 3146 */ 3147 public void addView(View child, int index, LayoutParams params) { 3148 if (DBG) { 3149 System.out.println(this + " addView"); 3150 } 3151 3152 // addViewInner() will call child.requestLayout() when setting the new LayoutParams 3153 // therefore, we call requestLayout() on ourselves before, so that the child's request 3154 // will be blocked at our level 3155 requestLayout(); 3156 invalidate(true); 3157 addViewInner(child, index, params, false); 3158 } 3159 3160 /** 3161 * {@inheritDoc} 3162 */ 3163 public void updateViewLayout(View view, ViewGroup.LayoutParams params) { 3164 if (!checkLayoutParams(params)) { 3165 throw new IllegalArgumentException("Invalid LayoutParams supplied to " + this); 3166 } 3167 if (view.mParent != this) { 3168 throw new IllegalArgumentException("Given view not a child of " + this); 3169 } 3170 view.setLayoutParams(params); 3171 } 3172 3173 /** 3174 * {@inheritDoc} 3175 */ 3176 protected boolean checkLayoutParams(ViewGroup.LayoutParams p) { 3177 return p != null; 3178 } 3179 3180 /** 3181 * Interface definition for a callback to be invoked when the hierarchy 3182 * within this view changed. The hierarchy changes whenever a child is added 3183 * to or removed from this view. 3184 */ 3185 public interface OnHierarchyChangeListener { 3186 /** 3187 * Called when a new child is added to a parent view. 3188 * 3189 * @param parent the view in which a child was added 3190 * @param child the new child view added in the hierarchy 3191 */ 3192 void onChildViewAdded(View parent, View child); 3193 3194 /** 3195 * Called when a child is removed from a parent view. 3196 * 3197 * @param parent the view from which the child was removed 3198 * @param child the child removed from the hierarchy 3199 */ 3200 void onChildViewRemoved(View parent, View child); 3201 } 3202 3203 /** 3204 * Register a callback to be invoked when a child is added to or removed 3205 * from this view. 3206 * 3207 * @param listener the callback to invoke on hierarchy change 3208 */ 3209 public void setOnHierarchyChangeListener(OnHierarchyChangeListener listener) { 3210 mOnHierarchyChangeListener = listener; 3211 } 3212 3213 /** 3214 * @hide 3215 */ 3216 protected void onViewAdded(View child) { 3217 if (mOnHierarchyChangeListener != null) { 3218 mOnHierarchyChangeListener.onChildViewAdded(this, child); 3219 } 3220 } 3221 3222 /** 3223 * @hide 3224 */ 3225 protected void onViewRemoved(View child) { 3226 if (mOnHierarchyChangeListener != null) { 3227 mOnHierarchyChangeListener.onChildViewRemoved(this, child); 3228 } 3229 } 3230 3231 /** 3232 * Adds a view during layout. This is useful if in your onLayout() method, 3233 * you need to add more views (as does the list view for example). 3234 * 3235 * If index is negative, it means put it at the end of the list. 3236 * 3237 * @param child the view to add to the group 3238 * @param index the index at which the child must be added 3239 * @param params the layout parameters to associate with the child 3240 * @return true if the child was added, false otherwise 3241 */ 3242 protected boolean addViewInLayout(View child, int index, LayoutParams params) { 3243 return addViewInLayout(child, index, params, false); 3244 } 3245 3246 /** 3247 * Adds a view during layout. This is useful if in your onLayout() method, 3248 * you need to add more views (as does the list view for example). 3249 * 3250 * If index is negative, it means put it at the end of the list. 3251 * 3252 * @param child the view to add to the group 3253 * @param index the index at which the child must be added 3254 * @param params the layout parameters to associate with the child 3255 * @param preventRequestLayout if true, calling this method will not trigger a 3256 * layout request on child 3257 * @return true if the child was added, false otherwise 3258 */ 3259 protected boolean addViewInLayout(View child, int index, LayoutParams params, 3260 boolean preventRequestLayout) { 3261 child.mParent = null; 3262 addViewInner(child, index, params, preventRequestLayout); 3263 child.mPrivateFlags = (child.mPrivateFlags & ~DIRTY_MASK) | DRAWN; 3264 return true; 3265 } 3266 3267 /** 3268 * Prevents the specified child to be laid out during the next layout pass. 3269 * 3270 * @param child the child on which to perform the cleanup 3271 */ 3272 protected void cleanupLayoutState(View child) { 3273 child.mPrivateFlags &= ~View.FORCE_LAYOUT; 3274 } 3275 3276 private void addViewInner(View child, int index, LayoutParams params, 3277 boolean preventRequestLayout) { 3278 3279 if (mTransition != null) { 3280 // Don't prevent other add transitions from completing, but cancel remove 3281 // transitions to let them complete the process before we add to the container 3282 mTransition.cancel(LayoutTransition.DISAPPEARING); 3283 } 3284 3285 if (child.getParent() != null) { 3286 throw new IllegalStateException("The specified child already has a parent. " + 3287 "You must call removeView() on the child's parent first."); 3288 } 3289 3290 if (mTransition != null) { 3291 mTransition.addChild(this, child); 3292 } 3293 3294 if (!checkLayoutParams(params)) { 3295 params = generateLayoutParams(params); 3296 } 3297 3298 if (preventRequestLayout) { 3299 child.mLayoutParams = params; 3300 } else { 3301 child.setLayoutParams(params); 3302 } 3303 3304 if (index < 0) { 3305 index = mChildrenCount; 3306 } 3307 3308 addInArray(child, index); 3309 3310 // tell our children 3311 if (preventRequestLayout) { 3312 child.assignParent(this); 3313 } else { 3314 child.mParent = this; 3315 } 3316 3317 if (child.hasFocus()) { 3318 requestChildFocus(child, child.findFocus()); 3319 } 3320 3321 AttachInfo ai = mAttachInfo; 3322 if (ai != null) { 3323 boolean lastKeepOn = ai.mKeepScreenOn; 3324 ai.mKeepScreenOn = false; 3325 child.dispatchAttachedToWindow(mAttachInfo, (mViewFlags&VISIBILITY_MASK)); 3326 if (ai.mKeepScreenOn) { 3327 needGlobalAttributesUpdate(true); 3328 } 3329 ai.mKeepScreenOn = lastKeepOn; 3330 } 3331 3332 onViewAdded(child); 3333 3334 if ((child.mViewFlags & DUPLICATE_PARENT_STATE) == DUPLICATE_PARENT_STATE) { 3335 mGroupFlags |= FLAG_NOTIFY_CHILDREN_ON_DRAWABLE_STATE_CHANGE; 3336 } 3337 } 3338 3339 private void addInArray(View child, int index) { 3340 View[] children = mChildren; 3341 final int count = mChildrenCount; 3342 final int size = children.length; 3343 if (index == count) { 3344 if (size == count) { 3345 mChildren = new View[size + ARRAY_CAPACITY_INCREMENT]; 3346 System.arraycopy(children, 0, mChildren, 0, size); 3347 children = mChildren; 3348 } 3349 children[mChildrenCount++] = child; 3350 } else if (index < count) { 3351 if (size == count) { 3352 mChildren = new View[size + ARRAY_CAPACITY_INCREMENT]; 3353 System.arraycopy(children, 0, mChildren, 0, index); 3354 System.arraycopy(children, index, mChildren, index + 1, count - index); 3355 children = mChildren; 3356 } else { 3357 System.arraycopy(children, index, children, index + 1, count - index); 3358 } 3359 children[index] = child; 3360 mChildrenCount++; 3361 if (mLastTouchDownIndex >= index) { 3362 mLastTouchDownIndex++; 3363 } 3364 } else { 3365 throw new IndexOutOfBoundsException("index=" + index + " count=" + count); 3366 } 3367 } 3368 3369 // This method also sets the child's mParent to null 3370 private void removeFromArray(int index) { 3371 final View[] children = mChildren; 3372 if (!(mTransitioningViews != null && mTransitioningViews.contains(children[index]))) { 3373 children[index].mParent = null; 3374 } 3375 final int count = mChildrenCount; 3376 if (index == count - 1) { 3377 children[--mChildrenCount] = null; 3378 } else if (index >= 0 && index < count) { 3379 System.arraycopy(children, index + 1, children, index, count - index - 1); 3380 children[--mChildrenCount] = null; 3381 } else { 3382 throw new IndexOutOfBoundsException(); 3383 } 3384 if (mLastTouchDownIndex == index) { 3385 mLastTouchDownTime = 0; 3386 mLastTouchDownIndex = -1; 3387 } else if (mLastTouchDownIndex > index) { 3388 mLastTouchDownIndex--; 3389 } 3390 } 3391 3392 // This method also sets the children's mParent to null 3393 private void removeFromArray(int start, int count) { 3394 final View[] children = mChildren; 3395 final int childrenCount = mChildrenCount; 3396 3397 start = Math.max(0, start); 3398 final int end = Math.min(childrenCount, start + count); 3399 3400 if (start == end) { 3401 return; 3402 } 3403 3404 if (end == childrenCount) { 3405 for (int i = start; i < end; i++) { 3406 children[i].mParent = null; 3407 children[i] = null; 3408 } 3409 } else { 3410 for (int i = start; i < end; i++) { 3411 children[i].mParent = null; 3412 } 3413 3414 // Since we're looping above, we might as well do the copy, but is arraycopy() 3415 // faster than the extra 2 bounds checks we would do in the loop? 3416 System.arraycopy(children, end, children, start, childrenCount - end); 3417 3418 for (int i = childrenCount - (end - start); i < childrenCount; i++) { 3419 children[i] = null; 3420 } 3421 } 3422 3423 mChildrenCount -= (end - start); 3424 } 3425 3426 private void bindLayoutAnimation(View child) { 3427 Animation a = mLayoutAnimationController.getAnimationForView(child); 3428 child.setAnimation(a); 3429 } 3430 3431 /** 3432 * Subclasses should override this method to set layout animation 3433 * parameters on the supplied child. 3434 * 3435 * @param child the child to associate with animation parameters 3436 * @param params the child's layout parameters which hold the animation 3437 * parameters 3438 * @param index the index of the child in the view group 3439 * @param count the number of children in the view group 3440 */ 3441 protected void attachLayoutAnimationParameters(View child, 3442 LayoutParams params, int index, int count) { 3443 LayoutAnimationController.AnimationParameters animationParams = 3444 params.layoutAnimationParameters; 3445 if (animationParams == null) { 3446 animationParams = new LayoutAnimationController.AnimationParameters(); 3447 params.layoutAnimationParameters = animationParams; 3448 } 3449 3450 animationParams.count = count; 3451 animationParams.index = index; 3452 } 3453 3454 /** 3455 * {@inheritDoc} 3456 */ 3457 public void removeView(View view) { 3458 removeViewInternal(view); 3459 requestLayout(); 3460 invalidate(true); 3461 } 3462 3463 /** 3464 * Removes a view during layout. This is useful if in your onLayout() method, 3465 * you need to remove more views. 3466 * 3467 * @param view the view to remove from the group 3468 */ 3469 public void removeViewInLayout(View view) { 3470 removeViewInternal(view); 3471 } 3472 3473 /** 3474 * Removes a range of views during layout. This is useful if in your onLayout() method, 3475 * you need to remove more views. 3476 * 3477 * @param start the index of the first view to remove from the group 3478 * @param count the number of views to remove from the group 3479 */ 3480 public void removeViewsInLayout(int start, int count) { 3481 removeViewsInternal(start, count); 3482 } 3483 3484 /** 3485 * Removes the view at the specified position in the group. 3486 * 3487 * @param index the position in the group of the view to remove 3488 */ 3489 public void removeViewAt(int index) { 3490 removeViewInternal(index, getChildAt(index)); 3491 requestLayout(); 3492 invalidate(true); 3493 } 3494 3495 /** 3496 * Removes the specified range of views from the group. 3497 * 3498 * @param start the first position in the group of the range of views to remove 3499 * @param count the number of views to remove 3500 */ 3501 public void removeViews(int start, int count) { 3502 removeViewsInternal(start, count); 3503 requestLayout(); 3504 invalidate(true); 3505 } 3506 3507 private void removeViewInternal(View view) { 3508 final int index = indexOfChild(view); 3509 if (index >= 0) { 3510 removeViewInternal(index, view); 3511 } 3512 } 3513 3514 private void removeViewInternal(int index, View view) { 3515 3516 if (mTransition != null) { 3517 mTransition.removeChild(this, view); 3518 } 3519 3520 boolean clearChildFocus = false; 3521 if (view == mFocused) { 3522 view.clearFocusForRemoval(); 3523 clearChildFocus = true; 3524 } 3525 3526 if (view.getAnimation() != null || 3527 (mTransitioningViews != null && mTransitioningViews.contains(view))) { 3528 addDisappearingView(view); 3529 } else if (view.mAttachInfo != null) { 3530 view.dispatchDetachedFromWindow(); 3531 } 3532 3533 onViewRemoved(view); 3534 3535 needGlobalAttributesUpdate(false); 3536 3537 removeFromArray(index); 3538 3539 if (clearChildFocus) { 3540 clearChildFocus(view); 3541 } 3542 } 3543 3544 /** 3545 * Sets the LayoutTransition object for this ViewGroup. If the LayoutTransition object is 3546 * not null, changes in layout which occur because of children being added to or removed from 3547 * the ViewGroup will be animated according to the animations defined in that LayoutTransition 3548 * object. By default, the transition object is null (so layout changes are not animated). 3549 * 3550 * @param transition The LayoutTransition object that will animated changes in layout. A value 3551 * of <code>null</code> means no transition will run on layout changes. 3552 * @attr ref android.R.styleable#ViewGroup_animateLayoutChanges 3553 */ 3554 public void setLayoutTransition(LayoutTransition transition) { 3555 if (mTransition != null) { 3556 mTransition.removeTransitionListener(mLayoutTransitionListener); 3557 } 3558 mTransition = transition; 3559 if (mTransition != null) { 3560 mTransition.addTransitionListener(mLayoutTransitionListener); 3561 } 3562 } 3563 3564 /** 3565 * Gets the LayoutTransition object for this ViewGroup. If the LayoutTransition object is 3566 * not null, changes in layout which occur because of children being added to or removed from 3567 * the ViewGroup will be animated according to the animations defined in that LayoutTransition 3568 * object. By default, the transition object is null (so layout changes are not animated). 3569 * 3570 * @return LayoutTranstion The LayoutTransition object that will animated changes in layout. 3571 * A value of <code>null</code> means no transition will run on layout changes. 3572 */ 3573 public LayoutTransition getLayoutTransition() { 3574 return mTransition; 3575 } 3576 3577 private void removeViewsInternal(int start, int count) { 3578 final View focused = mFocused; 3579 final boolean detach = mAttachInfo != null; 3580 View clearChildFocus = null; 3581 3582 final View[] children = mChildren; 3583 final int end = start + count; 3584 3585 for (int i = start; i < end; i++) { 3586 final View view = children[i]; 3587 3588 if (mTransition != null) { 3589 mTransition.removeChild(this, view); 3590 } 3591 3592 if (view == focused) { 3593 view.clearFocusForRemoval(); 3594 clearChildFocus = view; 3595 } 3596 3597 if (view.getAnimation() != null || 3598 (mTransitioningViews != null && mTransitioningViews.contains(view))) { 3599 addDisappearingView(view); 3600 } else if (detach) { 3601 view.dispatchDetachedFromWindow(); 3602 } 3603 3604 needGlobalAttributesUpdate(false); 3605 3606 onViewRemoved(view); 3607 } 3608 3609 removeFromArray(start, count); 3610 3611 if (clearChildFocus != null) { 3612 clearChildFocus(clearChildFocus); 3613 } 3614 } 3615 3616 /** 3617 * Call this method to remove all child views from the 3618 * ViewGroup. 3619 */ 3620 public void removeAllViews() { 3621 removeAllViewsInLayout(); 3622 requestLayout(); 3623 invalidate(true); 3624 } 3625 3626 /** 3627 * Called by a ViewGroup subclass to remove child views from itself, 3628 * when it must first know its size on screen before it can calculate how many 3629 * child views it will render. An example is a Gallery or a ListView, which 3630 * may "have" 50 children, but actually only render the number of children 3631 * that can currently fit inside the object on screen. Do not call 3632 * this method unless you are extending ViewGroup and understand the 3633 * view measuring and layout pipeline. 3634 */ 3635 public void removeAllViewsInLayout() { 3636 final int count = mChildrenCount; 3637 if (count <= 0) { 3638 return; 3639 } 3640 3641 final View[] children = mChildren; 3642 mChildrenCount = 0; 3643 3644 final View focused = mFocused; 3645 final boolean detach = mAttachInfo != null; 3646 View clearChildFocus = null; 3647 3648 needGlobalAttributesUpdate(false); 3649 3650 for (int i = count - 1; i >= 0; i--) { 3651 final View view = children[i]; 3652 3653 if (mTransition != null) { 3654 mTransition.removeChild(this, view); 3655 } 3656 3657 if (view == focused) { 3658 view.clearFocusForRemoval(); 3659 clearChildFocus = view; 3660 } 3661 3662 if (view.getAnimation() != null || 3663 (mTransitioningViews != null && mTransitioningViews.contains(view))) { 3664 addDisappearingView(view); 3665 } else if (detach) { 3666 view.dispatchDetachedFromWindow(); 3667 } 3668 3669 onViewRemoved(view); 3670 3671 view.mParent = null; 3672 children[i] = null; 3673 } 3674 3675 if (clearChildFocus != null) { 3676 clearChildFocus(clearChildFocus); 3677 } 3678 } 3679 3680 /** 3681 * Finishes the removal of a detached view. This method will dispatch the detached from 3682 * window event and notify the hierarchy change listener. 3683 * 3684 * @param child the child to be definitely removed from the view hierarchy 3685 * @param animate if true and the view has an animation, the view is placed in the 3686 * disappearing views list, otherwise, it is detached from the window 3687 * 3688 * @see #attachViewToParent(View, int, android.view.ViewGroup.LayoutParams) 3689 * @see #detachAllViewsFromParent() 3690 * @see #detachViewFromParent(View) 3691 * @see #detachViewFromParent(int) 3692 */ 3693 protected void removeDetachedView(View child, boolean animate) { 3694 if (mTransition != null) { 3695 mTransition.removeChild(this, child); 3696 } 3697 3698 if (child == mFocused) { 3699 child.clearFocus(); 3700 } 3701 3702 if ((animate && child.getAnimation() != null) || 3703 (mTransitioningViews != null && mTransitioningViews.contains(child))) { 3704 addDisappearingView(child); 3705 } else if (child.mAttachInfo != null) { 3706 child.dispatchDetachedFromWindow(); 3707 } 3708 3709 onViewRemoved(child); 3710 } 3711 3712 /** 3713 * Attaches a view to this view group. Attaching a view assigns this group as the parent, 3714 * sets the layout parameters and puts the view in the list of children so it can be retrieved 3715 * by calling {@link #getChildAt(int)}. 3716 * 3717 * This method should be called only for view which were detached from their parent. 3718 * 3719 * @param child the child to attach 3720 * @param index the index at which the child should be attached 3721 * @param params the layout parameters of the child 3722 * 3723 * @see #removeDetachedView(View, boolean) 3724 * @see #detachAllViewsFromParent() 3725 * @see #detachViewFromParent(View) 3726 * @see #detachViewFromParent(int) 3727 */ 3728 protected void attachViewToParent(View child, int index, LayoutParams params) { 3729 child.mLayoutParams = params; 3730 3731 if (index < 0) { 3732 index = mChildrenCount; 3733 } 3734 3735 addInArray(child, index); 3736 3737 child.mParent = this; 3738 child.mPrivateFlags = (child.mPrivateFlags & ~DIRTY_MASK & ~DRAWING_CACHE_VALID) | 3739 DRAWN | INVALIDATED; 3740 this.mPrivateFlags |= INVALIDATED; 3741 3742 if (child.hasFocus()) { 3743 requestChildFocus(child, child.findFocus()); 3744 } 3745 } 3746 3747 /** 3748 * Detaches a view from its parent. Detaching a view should be temporary and followed 3749 * either by a call to {@link #attachViewToParent(View, int, android.view.ViewGroup.LayoutParams)} 3750 * or a call to {@link #removeDetachedView(View, boolean)}. When a view is detached, 3751 * its parent is null and cannot be retrieved by a call to {@link #getChildAt(int)}. 3752 * 3753 * @param child the child to detach 3754 * 3755 * @see #detachViewFromParent(int) 3756 * @see #detachViewsFromParent(int, int) 3757 * @see #detachAllViewsFromParent() 3758 * @see #attachViewToParent(View, int, android.view.ViewGroup.LayoutParams) 3759 * @see #removeDetachedView(View, boolean) 3760 */ 3761 protected void detachViewFromParent(View child) { 3762 removeFromArray(indexOfChild(child)); 3763 } 3764 3765 /** 3766 * Detaches a view from its parent. Detaching a view should be temporary and followed 3767 * either by a call to {@link #attachViewToParent(View, int, android.view.ViewGroup.LayoutParams)} 3768 * or a call to {@link #removeDetachedView(View, boolean)}. When a view is detached, 3769 * its parent is null and cannot be retrieved by a call to {@link #getChildAt(int)}. 3770 * 3771 * @param index the index of the child to detach 3772 * 3773 * @see #detachViewFromParent(View) 3774 * @see #detachAllViewsFromParent() 3775 * @see #detachViewsFromParent(int, int) 3776 * @see #attachViewToParent(View, int, android.view.ViewGroup.LayoutParams) 3777 * @see #removeDetachedView(View, boolean) 3778 */ 3779 protected void detachViewFromParent(int index) { 3780 removeFromArray(index); 3781 } 3782 3783 /** 3784 * Detaches a range of view from their parent. Detaching a view should be temporary and followed 3785 * either by a call to {@link #attachViewToParent(View, int, android.view.ViewGroup.LayoutParams)} 3786 * or a call to {@link #removeDetachedView(View, boolean)}. When a view is detached, its 3787 * parent is null and cannot be retrieved by a call to {@link #getChildAt(int)}. 3788 * 3789 * @param start the first index of the childrend range to detach 3790 * @param count the number of children to detach 3791 * 3792 * @see #detachViewFromParent(View) 3793 * @see #detachViewFromParent(int) 3794 * @see #detachAllViewsFromParent() 3795 * @see #attachViewToParent(View, int, android.view.ViewGroup.LayoutParams) 3796 * @see #removeDetachedView(View, boolean) 3797 */ 3798 protected void detachViewsFromParent(int start, int count) { 3799 removeFromArray(start, count); 3800 } 3801 3802 /** 3803 * Detaches all views from the parent. Detaching a view should be temporary and followed 3804 * either by a call to {@link #attachViewToParent(View, int, android.view.ViewGroup.LayoutParams)} 3805 * or a call to {@link #removeDetachedView(View, boolean)}. When a view is detached, 3806 * its parent is null and cannot be retrieved by a call to {@link #getChildAt(int)}. 3807 * 3808 * @see #detachViewFromParent(View) 3809 * @see #detachViewFromParent(int) 3810 * @see #detachViewsFromParent(int, int) 3811 * @see #attachViewToParent(View, int, android.view.ViewGroup.LayoutParams) 3812 * @see #removeDetachedView(View, boolean) 3813 */ 3814 protected void detachAllViewsFromParent() { 3815 final int count = mChildrenCount; 3816 if (count <= 0) { 3817 return; 3818 } 3819 3820 final View[] children = mChildren; 3821 mChildrenCount = 0; 3822 3823 for (int i = count - 1; i >= 0; i--) { 3824 children[i].mParent = null; 3825 children[i] = null; 3826 } 3827 } 3828 3829 /** 3830 * Don't call or override this method. It is used for the implementation of 3831 * the view hierarchy. 3832 */ 3833 public final void invalidateChild(View child, final Rect dirty) { 3834 if (ViewDebug.TRACE_HIERARCHY) { 3835 ViewDebug.trace(this, ViewDebug.HierarchyTraceType.INVALIDATE_CHILD); 3836 } 3837 3838 ViewParent parent = this; 3839 3840 final AttachInfo attachInfo = mAttachInfo; 3841 if (attachInfo != null) { 3842 // If the child is drawing an animation, we want to copy this flag onto 3843 // ourselves and the parent to make sure the invalidate request goes 3844 // through 3845 final boolean drawAnimation = (child.mPrivateFlags & DRAW_ANIMATION) == DRAW_ANIMATION; 3846 3847 if (dirty == null) { 3848 if (child.mLayerType != LAYER_TYPE_NONE) { 3849 mPrivateFlags |= INVALIDATED; 3850 mPrivateFlags &= ~DRAWING_CACHE_VALID; 3851 child.mLocalDirtyRect.setEmpty(); 3852 } 3853 do { 3854 View view = null; 3855 if (parent instanceof View) { 3856 view = (View) parent; 3857 if (view.mLayerType != LAYER_TYPE_NONE) { 3858 view.mLocalDirtyRect.setEmpty(); 3859 if (view.getParent() instanceof View) { 3860 final View grandParent = (View) view.getParent(); 3861 grandParent.mPrivateFlags |= INVALIDATED; 3862 grandParent.mPrivateFlags &= ~DRAWING_CACHE_VALID; 3863 } 3864 } 3865 if ((view.mPrivateFlags & DIRTY_MASK) != 0) { 3866 // already marked dirty - we're done 3867 break; 3868 } 3869 } 3870 3871 if (drawAnimation) { 3872 if (view != null) { 3873 view.mPrivateFlags |= DRAW_ANIMATION; 3874 } else if (parent instanceof ViewRootImpl) { 3875 ((ViewRootImpl) parent).mIsAnimating = true; 3876 } 3877 } 3878 3879 if (parent instanceof ViewRootImpl) { 3880 ((ViewRootImpl) parent).invalidate(); 3881 parent = null; 3882 } else if (view != null) { 3883 if ((view.mPrivateFlags & DRAWN) == DRAWN || 3884 (view.mPrivateFlags & DRAWING_CACHE_VALID) == DRAWING_CACHE_VALID) { 3885 view.mPrivateFlags &= ~DRAWING_CACHE_VALID; 3886 view.mPrivateFlags |= DIRTY; 3887 parent = view.mParent; 3888 } else { 3889 parent = null; 3890 } 3891 } 3892 } while (parent != null); 3893 } else { 3894 // Check whether the child that requests the invalidate is fully opaque 3895 final boolean isOpaque = child.isOpaque() && !drawAnimation && 3896 child.getAnimation() == null; 3897 // Mark the child as dirty, using the appropriate flag 3898 // Make sure we do not set both flags at the same time 3899 int opaqueFlag = isOpaque ? DIRTY_OPAQUE : DIRTY; 3900 3901 if (child.mLayerType != LAYER_TYPE_NONE) { 3902 mPrivateFlags |= INVALIDATED; 3903 mPrivateFlags &= ~DRAWING_CACHE_VALID; 3904 child.mLocalDirtyRect.union(dirty); 3905 } 3906 3907 final int[] location = attachInfo.mInvalidateChildLocation; 3908 location[CHILD_LEFT_INDEX] = child.mLeft; 3909 location[CHILD_TOP_INDEX] = child.mTop; 3910 Matrix childMatrix = child.getMatrix(); 3911 if (!childMatrix.isIdentity()) { 3912 RectF boundingRect = attachInfo.mTmpTransformRect; 3913 boundingRect.set(dirty); 3914 //boundingRect.inset(-0.5f, -0.5f); 3915 childMatrix.mapRect(boundingRect); 3916 dirty.set((int) (boundingRect.left - 0.5f), 3917 (int) (boundingRect.top - 0.5f), 3918 (int) (boundingRect.right + 0.5f), 3919 (int) (boundingRect.bottom + 0.5f)); 3920 } 3921 3922 do { 3923 View view = null; 3924 if (parent instanceof View) { 3925 view = (View) parent; 3926 if (view.mLayerType != LAYER_TYPE_NONE && 3927 view.getParent() instanceof View) { 3928 final View grandParent = (View) view.getParent(); 3929 grandParent.mPrivateFlags |= INVALIDATED; 3930 grandParent.mPrivateFlags &= ~DRAWING_CACHE_VALID; 3931 } 3932 } 3933 3934 if (drawAnimation) { 3935 if (view != null) { 3936 view.mPrivateFlags |= DRAW_ANIMATION; 3937 } else if (parent instanceof ViewRootImpl) { 3938 ((ViewRootImpl) parent).mIsAnimating = true; 3939 } 3940 } 3941 3942 // If the parent is dirty opaque or not dirty, mark it dirty with the opaque 3943 // flag coming from the child that initiated the invalidate 3944 if (view != null) { 3945 if ((view.mViewFlags & FADING_EDGE_MASK) != 0 && 3946 view.getSolidColor() == 0) { 3947 opaqueFlag = DIRTY; 3948 } 3949 if ((view.mPrivateFlags & DIRTY_MASK) != DIRTY) { 3950 view.mPrivateFlags = (view.mPrivateFlags & ~DIRTY_MASK) | opaqueFlag; 3951 } 3952 } 3953 3954 parent = parent.invalidateChildInParent(location, dirty); 3955 if (view != null) { 3956 // Account for transform on current parent 3957 Matrix m = view.getMatrix(); 3958 if (!m.isIdentity()) { 3959 RectF boundingRect = attachInfo.mTmpTransformRect; 3960 boundingRect.set(dirty); 3961 m.mapRect(boundingRect); 3962 dirty.set((int) boundingRect.left, (int) boundingRect.top, 3963 (int) (boundingRect.right + 0.5f), 3964 (int) (boundingRect.bottom + 0.5f)); 3965 } 3966 } 3967 } while (parent != null); 3968 } 3969 } 3970 } 3971 3972 /** 3973 * Don't call or override this method. It is used for the implementation of 3974 * the view hierarchy. 3975 * 3976 * This implementation returns null if this ViewGroup does not have a parent, 3977 * if this ViewGroup is already fully invalidated or if the dirty rectangle 3978 * does not intersect with this ViewGroup's bounds. 3979 */ 3980 public ViewParent invalidateChildInParent(final int[] location, final Rect dirty) { 3981 if (ViewDebug.TRACE_HIERARCHY) { 3982 ViewDebug.trace(this, ViewDebug.HierarchyTraceType.INVALIDATE_CHILD_IN_PARENT); 3983 } 3984 3985 if ((mPrivateFlags & DRAWN) == DRAWN || 3986 (mPrivateFlags & DRAWING_CACHE_VALID) == DRAWING_CACHE_VALID) { 3987 if ((mGroupFlags & (FLAG_OPTIMIZE_INVALIDATE | FLAG_ANIMATION_DONE)) != 3988 FLAG_OPTIMIZE_INVALIDATE) { 3989 dirty.offset(location[CHILD_LEFT_INDEX] - mScrollX, 3990 location[CHILD_TOP_INDEX] - mScrollY); 3991 3992 final int left = mLeft; 3993 final int top = mTop; 3994 3995 if ((mGroupFlags & FLAG_CLIP_CHILDREN) != FLAG_CLIP_CHILDREN || 3996 dirty.intersect(0, 0, mRight - left, mBottom - top) || 3997 (mPrivateFlags & DRAW_ANIMATION) == DRAW_ANIMATION) { 3998 mPrivateFlags &= ~DRAWING_CACHE_VALID; 3999 4000 location[CHILD_LEFT_INDEX] = left; 4001 location[CHILD_TOP_INDEX] = top; 4002 4003 if (mLayerType != LAYER_TYPE_NONE) { 4004 mLocalDirtyRect.union(dirty); 4005 } 4006 4007 return mParent; 4008 } 4009 } else { 4010 mPrivateFlags &= ~DRAWN & ~DRAWING_CACHE_VALID; 4011 4012 location[CHILD_LEFT_INDEX] = mLeft; 4013 location[CHILD_TOP_INDEX] = mTop; 4014 if ((mGroupFlags & FLAG_CLIP_CHILDREN) == FLAG_CLIP_CHILDREN) { 4015 dirty.set(0, 0, mRight - mLeft, mBottom - mTop); 4016 } else { 4017 // in case the dirty rect extends outside the bounds of this container 4018 dirty.union(0, 0, mRight - mLeft, mBottom - mTop); 4019 } 4020 4021 if (mLayerType != LAYER_TYPE_NONE) { 4022 mLocalDirtyRect.union(dirty); 4023 } 4024 4025 return mParent; 4026 } 4027 } 4028 4029 return null; 4030 } 4031 4032 /** 4033 * Offset a rectangle that is in a descendant's coordinate 4034 * space into our coordinate space. 4035 * @param descendant A descendant of this view 4036 * @param rect A rectangle defined in descendant's coordinate space. 4037 */ 4038 public final void offsetDescendantRectToMyCoords(View descendant, Rect rect) { 4039 offsetRectBetweenParentAndChild(descendant, rect, true, false); 4040 } 4041 4042 /** 4043 * Offset a rectangle that is in our coordinate space into an ancestor's 4044 * coordinate space. 4045 * @param descendant A descendant of this view 4046 * @param rect A rectangle defined in descendant's coordinate space. 4047 */ 4048 public final void offsetRectIntoDescendantCoords(View descendant, Rect rect) { 4049 offsetRectBetweenParentAndChild(descendant, rect, false, false); 4050 } 4051 4052 /** 4053 * Helper method that offsets a rect either from parent to descendant or 4054 * descendant to parent. 4055 */ 4056 void offsetRectBetweenParentAndChild(View descendant, Rect rect, 4057 boolean offsetFromChildToParent, boolean clipToBounds) { 4058 4059 // already in the same coord system :) 4060 if (descendant == this) { 4061 return; 4062 } 4063 4064 ViewParent theParent = descendant.mParent; 4065 4066 // search and offset up to the parent 4067 while ((theParent != null) 4068 && (theParent instanceof View) 4069 && (theParent != this)) { 4070 4071 if (offsetFromChildToParent) { 4072 rect.offset(descendant.mLeft - descendant.mScrollX, 4073 descendant.mTop - descendant.mScrollY); 4074 if (clipToBounds) { 4075 View p = (View) theParent; 4076 rect.intersect(0, 0, p.mRight - p.mLeft, p.mBottom - p.mTop); 4077 } 4078 } else { 4079 if (clipToBounds) { 4080 View p = (View) theParent; 4081 rect.intersect(0, 0, p.mRight - p.mLeft, p.mBottom - p.mTop); 4082 } 4083 rect.offset(descendant.mScrollX - descendant.mLeft, 4084 descendant.mScrollY - descendant.mTop); 4085 } 4086 4087 descendant = (View) theParent; 4088 theParent = descendant.mParent; 4089 } 4090 4091 // now that we are up to this view, need to offset one more time 4092 // to get into our coordinate space 4093 if (theParent == this) { 4094 if (offsetFromChildToParent) { 4095 rect.offset(descendant.mLeft - descendant.mScrollX, 4096 descendant.mTop - descendant.mScrollY); 4097 } else { 4098 rect.offset(descendant.mScrollX - descendant.mLeft, 4099 descendant.mScrollY - descendant.mTop); 4100 } 4101 } else { 4102 throw new IllegalArgumentException("parameter must be a descendant of this view"); 4103 } 4104 } 4105 4106 /** 4107 * Offset the vertical location of all children of this view by the specified number of pixels. 4108 * 4109 * @param offset the number of pixels to offset 4110 * 4111 * @hide 4112 */ 4113 public void offsetChildrenTopAndBottom(int offset) { 4114 final int count = mChildrenCount; 4115 final View[] children = mChildren; 4116 4117 for (int i = 0; i < count; i++) { 4118 final View v = children[i]; 4119 v.mTop += offset; 4120 v.mBottom += offset; 4121 } 4122 } 4123 4124 /** 4125 * {@inheritDoc} 4126 */ 4127 public boolean getChildVisibleRect(View child, Rect r, android.graphics.Point offset) { 4128 int dx = child.mLeft - mScrollX; 4129 int dy = child.mTop - mScrollY; 4130 if (offset != null) { 4131 offset.x += dx; 4132 offset.y += dy; 4133 } 4134 r.offset(dx, dy); 4135 return r.intersect(0, 0, mRight - mLeft, mBottom - mTop) && 4136 (mParent == null || mParent.getChildVisibleRect(this, r, offset)); 4137 } 4138 4139 /** 4140 * {@inheritDoc} 4141 */ 4142 @Override 4143 public final void layout(int l, int t, int r, int b) { 4144 if (mTransition == null || !mTransition.isChangingLayout()) { 4145 super.layout(l, t, r, b); 4146 } else { 4147 // record the fact that we noop'd it; request layout when transition finishes 4148 mLayoutSuppressed = true; 4149 } 4150 } 4151 4152 /** 4153 * {@inheritDoc} 4154 */ 4155 @Override 4156 protected abstract void onLayout(boolean changed, 4157 int l, int t, int r, int b); 4158 4159 /** 4160 * Indicates whether the view group has the ability to animate its children 4161 * after the first layout. 4162 * 4163 * @return true if the children can be animated, false otherwise 4164 */ 4165 protected boolean canAnimate() { 4166 return mLayoutAnimationController != null; 4167 } 4168 4169 /** 4170 * Runs the layout animation. Calling this method triggers a relayout of 4171 * this view group. 4172 */ 4173 public void startLayoutAnimation() { 4174 if (mLayoutAnimationController != null) { 4175 mGroupFlags |= FLAG_RUN_ANIMATION; 4176 requestLayout(); 4177 } 4178 } 4179 4180 /** 4181 * Schedules the layout animation to be played after the next layout pass 4182 * of this view group. This can be used to restart the layout animation 4183 * when the content of the view group changes or when the activity is 4184 * paused and resumed. 4185 */ 4186 public void scheduleLayoutAnimation() { 4187 mGroupFlags |= FLAG_RUN_ANIMATION; 4188 } 4189 4190 /** 4191 * Sets the layout animation controller used to animate the group's 4192 * children after the first layout. 4193 * 4194 * @param controller the animation controller 4195 */ 4196 public void setLayoutAnimation(LayoutAnimationController controller) { 4197 mLayoutAnimationController = controller; 4198 if (mLayoutAnimationController != null) { 4199 mGroupFlags |= FLAG_RUN_ANIMATION; 4200 } 4201 } 4202 4203 /** 4204 * Returns the layout animation controller used to animate the group's 4205 * children. 4206 * 4207 * @return the current animation controller 4208 */ 4209 public LayoutAnimationController getLayoutAnimation() { 4210 return mLayoutAnimationController; 4211 } 4212 4213 /** 4214 * Indicates whether the children's drawing cache is used during a layout 4215 * animation. By default, the drawing cache is enabled but this will prevent 4216 * nested layout animations from working. To nest animations, you must disable 4217 * the cache. 4218 * 4219 * @return true if the animation cache is enabled, false otherwise 4220 * 4221 * @see #setAnimationCacheEnabled(boolean) 4222 * @see View#setDrawingCacheEnabled(boolean) 4223 */ 4224 @ViewDebug.ExportedProperty 4225 public boolean isAnimationCacheEnabled() { 4226 return (mGroupFlags & FLAG_ANIMATION_CACHE) == FLAG_ANIMATION_CACHE; 4227 } 4228 4229 /** 4230 * Enables or disables the children's drawing cache during a layout animation. 4231 * By default, the drawing cache is enabled but this will prevent nested 4232 * layout animations from working. To nest animations, you must disable the 4233 * cache. 4234 * 4235 * @param enabled true to enable the animation cache, false otherwise 4236 * 4237 * @see #isAnimationCacheEnabled() 4238 * @see View#setDrawingCacheEnabled(boolean) 4239 */ 4240 public void setAnimationCacheEnabled(boolean enabled) { 4241 setBooleanFlag(FLAG_ANIMATION_CACHE, enabled); 4242 } 4243 4244 /** 4245 * Indicates whether this ViewGroup will always try to draw its children using their 4246 * drawing cache. By default this property is enabled. 4247 * 4248 * @return true if the animation cache is enabled, false otherwise 4249 * 4250 * @see #setAlwaysDrawnWithCacheEnabled(boolean) 4251 * @see #setChildrenDrawnWithCacheEnabled(boolean) 4252 * @see View#setDrawingCacheEnabled(boolean) 4253 */ 4254 @ViewDebug.ExportedProperty(category = "drawing") 4255 public boolean isAlwaysDrawnWithCacheEnabled() { 4256 return (mGroupFlags & FLAG_ALWAYS_DRAWN_WITH_CACHE) == FLAG_ALWAYS_DRAWN_WITH_CACHE; 4257 } 4258 4259 /** 4260 * Indicates whether this ViewGroup will always try to draw its children using their 4261 * drawing cache. This property can be set to true when the cache rendering is 4262 * slightly different from the children's normal rendering. Renderings can be different, 4263 * for instance, when the cache's quality is set to low. 4264 * 4265 * When this property is disabled, the ViewGroup will use the drawing cache of its 4266 * children only when asked to. It's usually the task of subclasses to tell ViewGroup 4267 * when to start using the drawing cache and when to stop using it. 4268 * 4269 * @param always true to always draw with the drawing cache, false otherwise 4270 * 4271 * @see #isAlwaysDrawnWithCacheEnabled() 4272 * @see #setChildrenDrawnWithCacheEnabled(boolean) 4273 * @see View#setDrawingCacheEnabled(boolean) 4274 * @see View#setDrawingCacheQuality(int) 4275 */ 4276 public void setAlwaysDrawnWithCacheEnabled(boolean always) { 4277 setBooleanFlag(FLAG_ALWAYS_DRAWN_WITH_CACHE, always); 4278 } 4279 4280 /** 4281 * Indicates whether the ViewGroup is currently drawing its children using 4282 * their drawing cache. 4283 * 4284 * @return true if children should be drawn with their cache, false otherwise 4285 * 4286 * @see #setAlwaysDrawnWithCacheEnabled(boolean) 4287 * @see #setChildrenDrawnWithCacheEnabled(boolean) 4288 */ 4289 @ViewDebug.ExportedProperty(category = "drawing") 4290 protected boolean isChildrenDrawnWithCacheEnabled() { 4291 return (mGroupFlags & FLAG_CHILDREN_DRAWN_WITH_CACHE) == FLAG_CHILDREN_DRAWN_WITH_CACHE; 4292 } 4293 4294 /** 4295 * Tells the ViewGroup to draw its children using their drawing cache. This property 4296 * is ignored when {@link #isAlwaysDrawnWithCacheEnabled()} is true. A child's drawing cache 4297 * will be used only if it has been enabled. 4298 * 4299 * Subclasses should call this method to start and stop using the drawing cache when 4300 * they perform performance sensitive operations, like scrolling or animating. 4301 * 4302 * @param enabled true if children should be drawn with their cache, false otherwise 4303 * 4304 * @see #setAlwaysDrawnWithCacheEnabled(boolean) 4305 * @see #isChildrenDrawnWithCacheEnabled() 4306 */ 4307 protected void setChildrenDrawnWithCacheEnabled(boolean enabled) { 4308 setBooleanFlag(FLAG_CHILDREN_DRAWN_WITH_CACHE, enabled); 4309 } 4310 4311 /** 4312 * Indicates whether the ViewGroup is drawing its children in the order defined by 4313 * {@link #getChildDrawingOrder(int, int)}. 4314 * 4315 * @return true if children drawing order is defined by {@link #getChildDrawingOrder(int, int)}, 4316 * false otherwise 4317 * 4318 * @see #setChildrenDrawingOrderEnabled(boolean) 4319 * @see #getChildDrawingOrder(int, int) 4320 */ 4321 @ViewDebug.ExportedProperty(category = "drawing") 4322 protected boolean isChildrenDrawingOrderEnabled() { 4323 return (mGroupFlags & FLAG_USE_CHILD_DRAWING_ORDER) == FLAG_USE_CHILD_DRAWING_ORDER; 4324 } 4325 4326 /** 4327 * Tells the ViewGroup whether to draw its children in the order defined by the method 4328 * {@link #getChildDrawingOrder(int, int)}. 4329 * 4330 * @param enabled true if the order of the children when drawing is determined by 4331 * {@link #getChildDrawingOrder(int, int)}, false otherwise 4332 * 4333 * @see #isChildrenDrawingOrderEnabled() 4334 * @see #getChildDrawingOrder(int, int) 4335 */ 4336 protected void setChildrenDrawingOrderEnabled(boolean enabled) { 4337 setBooleanFlag(FLAG_USE_CHILD_DRAWING_ORDER, enabled); 4338 } 4339 4340 private void setBooleanFlag(int flag, boolean value) { 4341 if (value) { 4342 mGroupFlags |= flag; 4343 } else { 4344 mGroupFlags &= ~flag; 4345 } 4346 } 4347 4348 /** 4349 * Returns an integer indicating what types of drawing caches are kept in memory. 4350 * 4351 * @see #setPersistentDrawingCache(int) 4352 * @see #setAnimationCacheEnabled(boolean) 4353 * 4354 * @return one or a combination of {@link #PERSISTENT_NO_CACHE}, 4355 * {@link #PERSISTENT_ANIMATION_CACHE}, {@link #PERSISTENT_SCROLLING_CACHE} 4356 * and {@link #PERSISTENT_ALL_CACHES} 4357 */ 4358 @ViewDebug.ExportedProperty(category = "drawing", mapping = { 4359 @ViewDebug.IntToString(from = PERSISTENT_NO_CACHE, to = "NONE"), 4360 @ViewDebug.IntToString(from = PERSISTENT_ANIMATION_CACHE, to = "ANIMATION"), 4361 @ViewDebug.IntToString(from = PERSISTENT_SCROLLING_CACHE, to = "SCROLLING"), 4362 @ViewDebug.IntToString(from = PERSISTENT_ALL_CACHES, to = "ALL") 4363 }) 4364 public int getPersistentDrawingCache() { 4365 return mPersistentDrawingCache; 4366 } 4367 4368 /** 4369 * Indicates what types of drawing caches should be kept in memory after 4370 * they have been created. 4371 * 4372 * @see #getPersistentDrawingCache() 4373 * @see #setAnimationCacheEnabled(boolean) 4374 * 4375 * @param drawingCacheToKeep one or a combination of {@link #PERSISTENT_NO_CACHE}, 4376 * {@link #PERSISTENT_ANIMATION_CACHE}, {@link #PERSISTENT_SCROLLING_CACHE} 4377 * and {@link #PERSISTENT_ALL_CACHES} 4378 */ 4379 public void setPersistentDrawingCache(int drawingCacheToKeep) { 4380 mPersistentDrawingCache = drawingCacheToKeep & PERSISTENT_ALL_CACHES; 4381 } 4382 4383 /** 4384 * Returns a new set of layout parameters based on the supplied attributes set. 4385 * 4386 * @param attrs the attributes to build the layout parameters from 4387 * 4388 * @return an instance of {@link android.view.ViewGroup.LayoutParams} or one 4389 * of its descendants 4390 */ 4391 public LayoutParams generateLayoutParams(AttributeSet attrs) { 4392 return new LayoutParams(getContext(), attrs); 4393 } 4394 4395 /** 4396 * Returns a safe set of layout parameters based on the supplied layout params. 4397 * When a ViewGroup is passed a View whose layout params do not pass the test of 4398 * {@link #checkLayoutParams(android.view.ViewGroup.LayoutParams)}, this method 4399 * is invoked. This method should return a new set of layout params suitable for 4400 * this ViewGroup, possibly by copying the appropriate attributes from the 4401 * specified set of layout params. 4402 * 4403 * @param p The layout parameters to convert into a suitable set of layout parameters 4404 * for this ViewGroup. 4405 * 4406 * @return an instance of {@link android.view.ViewGroup.LayoutParams} or one 4407 * of its descendants 4408 */ 4409 protected LayoutParams generateLayoutParams(ViewGroup.LayoutParams p) { 4410 return p; 4411 } 4412 4413 /** 4414 * Returns a set of default layout parameters. These parameters are requested 4415 * when the View passed to {@link #addView(View)} has no layout parameters 4416 * already set. If null is returned, an exception is thrown from addView. 4417 * 4418 * @return a set of default layout parameters or null 4419 */ 4420 protected LayoutParams generateDefaultLayoutParams() { 4421 return new LayoutParams(LayoutParams.WRAP_CONTENT, LayoutParams.WRAP_CONTENT); 4422 } 4423 4424 /** 4425 * @hide 4426 */ 4427 @Override 4428 protected boolean dispatchConsistencyCheck(int consistency) { 4429 boolean result = super.dispatchConsistencyCheck(consistency); 4430 4431 final int count = mChildrenCount; 4432 final View[] children = mChildren; 4433 for (int i = 0; i < count; i++) { 4434 if (!children[i].dispatchConsistencyCheck(consistency)) result = false; 4435 } 4436 4437 return result; 4438 } 4439 4440 /** 4441 * @hide 4442 */ 4443 @Override 4444 protected boolean onConsistencyCheck(int consistency) { 4445 boolean result = super.onConsistencyCheck(consistency); 4446 4447 final boolean checkLayout = (consistency & ViewDebug.CONSISTENCY_LAYOUT) != 0; 4448 final boolean checkDrawing = (consistency & ViewDebug.CONSISTENCY_DRAWING) != 0; 4449 4450 if (checkLayout) { 4451 final int count = mChildrenCount; 4452 final View[] children = mChildren; 4453 for (int i = 0; i < count; i++) { 4454 if (children[i].getParent() != this) { 4455 result = false; 4456 android.util.Log.d(ViewDebug.CONSISTENCY_LOG_TAG, 4457 "View " + children[i] + " has no parent/a parent that is not " + this); 4458 } 4459 } 4460 } 4461 4462 if (checkDrawing) { 4463 // If this group is dirty, check that the parent is dirty as well 4464 if ((mPrivateFlags & DIRTY_MASK) != 0) { 4465 final ViewParent parent = getParent(); 4466 if (parent != null && !(parent instanceof ViewRootImpl)) { 4467 if ((((View) parent).mPrivateFlags & DIRTY_MASK) == 0) { 4468 result = false; 4469 android.util.Log.d(ViewDebug.CONSISTENCY_LOG_TAG, 4470 "ViewGroup " + this + " is dirty but its parent is not: " + this); 4471 } 4472 } 4473 } 4474 } 4475 4476 return result; 4477 } 4478 4479 /** 4480 * {@inheritDoc} 4481 */ 4482 @Override 4483 protected void debug(int depth) { 4484 super.debug(depth); 4485 String output; 4486 4487 if (mFocused != null) { 4488 output = debugIndent(depth); 4489 output += "mFocused"; 4490 Log.d(VIEW_LOG_TAG, output); 4491 } 4492 if (mChildrenCount != 0) { 4493 output = debugIndent(depth); 4494 output += "{"; 4495 Log.d(VIEW_LOG_TAG, output); 4496 } 4497 int count = mChildrenCount; 4498 for (int i = 0; i < count; i++) { 4499 View child = mChildren[i]; 4500 child.debug(depth + 1); 4501 } 4502 4503 if (mChildrenCount != 0) { 4504 output = debugIndent(depth); 4505 output += "}"; 4506 Log.d(VIEW_LOG_TAG, output); 4507 } 4508 } 4509 4510 /** 4511 * Returns the position in the group of the specified child view. 4512 * 4513 * @param child the view for which to get the position 4514 * @return a positive integer representing the position of the view in the 4515 * group, or -1 if the view does not exist in the group 4516 */ 4517 public int indexOfChild(View child) { 4518 final int count = mChildrenCount; 4519 final View[] children = mChildren; 4520 for (int i = 0; i < count; i++) { 4521 if (children[i] == child) { 4522 return i; 4523 } 4524 } 4525 return -1; 4526 } 4527 4528 /** 4529 * Returns the number of children in the group. 4530 * 4531 * @return a positive integer representing the number of children in 4532 * the group 4533 */ 4534 public int getChildCount() { 4535 return mChildrenCount; 4536 } 4537 4538 /** 4539 * Returns the view at the specified position in the group. 4540 * 4541 * @param index the position at which to get the view from 4542 * @return the view at the specified position or null if the position 4543 * does not exist within the group 4544 */ 4545 public View getChildAt(int index) { 4546 if (index < 0 || index >= mChildrenCount) { 4547 return null; 4548 } 4549 return mChildren[index]; 4550 } 4551 4552 /** 4553 * Ask all of the children of this view to measure themselves, taking into 4554 * account both the MeasureSpec requirements for this view and its padding. 4555 * We skip children that are in the GONE state The heavy lifting is done in 4556 * getChildMeasureSpec. 4557 * 4558 * @param widthMeasureSpec The width requirements for this view 4559 * @param heightMeasureSpec The height requirements for this view 4560 */ 4561 protected void measureChildren(int widthMeasureSpec, int heightMeasureSpec) { 4562 final int size = mChildrenCount; 4563 final View[] children = mChildren; 4564 for (int i = 0; i < size; ++i) { 4565 final View child = children[i]; 4566 if ((child.mViewFlags & VISIBILITY_MASK) != GONE) { 4567 measureChild(child, widthMeasureSpec, heightMeasureSpec); 4568 } 4569 } 4570 } 4571 4572 /** 4573 * Ask one of the children of this view to measure itself, taking into 4574 * account both the MeasureSpec requirements for this view and its padding. 4575 * The heavy lifting is done in getChildMeasureSpec. 4576 * 4577 * @param child The child to measure 4578 * @param parentWidthMeasureSpec The width requirements for this view 4579 * @param parentHeightMeasureSpec The height requirements for this view 4580 */ 4581 protected void measureChild(View child, int parentWidthMeasureSpec, 4582 int parentHeightMeasureSpec) { 4583 final LayoutParams lp = child.getLayoutParams(); 4584 4585 final int childWidthMeasureSpec = getChildMeasureSpec(parentWidthMeasureSpec, 4586 mPaddingLeft + mPaddingRight, lp.width); 4587 final int childHeightMeasureSpec = getChildMeasureSpec(parentHeightMeasureSpec, 4588 mPaddingTop + mPaddingBottom, lp.height); 4589 4590 child.measure(childWidthMeasureSpec, childHeightMeasureSpec); 4591 } 4592 4593 /** 4594 * Ask one of the children of this view to measure itself, taking into 4595 * account both the MeasureSpec requirements for this view and its padding 4596 * and margins. The child must have MarginLayoutParams The heavy lifting is 4597 * done in getChildMeasureSpec. 4598 * 4599 * @param child The child to measure 4600 * @param parentWidthMeasureSpec The width requirements for this view 4601 * @param widthUsed Extra space that has been used up by the parent 4602 * horizontally (possibly by other children of the parent) 4603 * @param parentHeightMeasureSpec The height requirements for this view 4604 * @param heightUsed Extra space that has been used up by the parent 4605 * vertically (possibly by other children of the parent) 4606 */ 4607 protected void measureChildWithMargins(View child, 4608 int parentWidthMeasureSpec, int widthUsed, 4609 int parentHeightMeasureSpec, int heightUsed) { 4610 final MarginLayoutParams lp = (MarginLayoutParams) child.getLayoutParams(); 4611 4612 final int childWidthMeasureSpec = getChildMeasureSpec(parentWidthMeasureSpec, 4613 mPaddingLeft + mPaddingRight + lp.leftMargin + lp.rightMargin 4614 + widthUsed, lp.width); 4615 final int childHeightMeasureSpec = getChildMeasureSpec(parentHeightMeasureSpec, 4616 mPaddingTop + mPaddingBottom + lp.topMargin + lp.bottomMargin 4617 + heightUsed, lp.height); 4618 4619 child.measure(childWidthMeasureSpec, childHeightMeasureSpec); 4620 } 4621 4622 /** 4623 * Does the hard part of measureChildren: figuring out the MeasureSpec to 4624 * pass to a particular child. This method figures out the right MeasureSpec 4625 * for one dimension (height or width) of one child view. 4626 * 4627 * The goal is to combine information from our MeasureSpec with the 4628 * LayoutParams of the child to get the best possible results. For example, 4629 * if the this view knows its size (because its MeasureSpec has a mode of 4630 * EXACTLY), and the child has indicated in its LayoutParams that it wants 4631 * to be the same size as the parent, the parent should ask the child to 4632 * layout given an exact size. 4633 * 4634 * @param spec The requirements for this view 4635 * @param padding The padding of this view for the current dimension and 4636 * margins, if applicable 4637 * @param childDimension How big the child wants to be in the current 4638 * dimension 4639 * @return a MeasureSpec integer for the child 4640 */ 4641 public static int getChildMeasureSpec(int spec, int padding, int childDimension) { 4642 int specMode = MeasureSpec.getMode(spec); 4643 int specSize = MeasureSpec.getSize(spec); 4644 4645 int size = Math.max(0, specSize - padding); 4646 4647 int resultSize = 0; 4648 int resultMode = 0; 4649 4650 switch (specMode) { 4651 // Parent has imposed an exact size on us 4652 case MeasureSpec.EXACTLY: 4653 if (childDimension >= 0) { 4654 resultSize = childDimension; 4655 resultMode = MeasureSpec.EXACTLY; 4656 } else if (childDimension == LayoutParams.MATCH_PARENT) { 4657 // Child wants to be our size. So be it. 4658 resultSize = size; 4659 resultMode = MeasureSpec.EXACTLY; 4660 } else if (childDimension == LayoutParams.WRAP_CONTENT) { 4661 // Child wants to determine its own size. It can't be 4662 // bigger than us. 4663 resultSize = size; 4664 resultMode = MeasureSpec.AT_MOST; 4665 } 4666 break; 4667 4668 // Parent has imposed a maximum size on us 4669 case MeasureSpec.AT_MOST: 4670 if (childDimension >= 0) { 4671 // Child wants a specific size... so be it 4672 resultSize = childDimension; 4673 resultMode = MeasureSpec.EXACTLY; 4674 } else if (childDimension == LayoutParams.MATCH_PARENT) { 4675 // Child wants to be our size, but our size is not fixed. 4676 // Constrain child to not be bigger than us. 4677 resultSize = size; 4678 resultMode = MeasureSpec.AT_MOST; 4679 } else if (childDimension == LayoutParams.WRAP_CONTENT) { 4680 // Child wants to determine its own size. It can't be 4681 // bigger than us. 4682 resultSize = size; 4683 resultMode = MeasureSpec.AT_MOST; 4684 } 4685 break; 4686 4687 // Parent asked to see how big we want to be 4688 case MeasureSpec.UNSPECIFIED: 4689 if (childDimension >= 0) { 4690 // Child wants a specific size... let him have it 4691 resultSize = childDimension; 4692 resultMode = MeasureSpec.EXACTLY; 4693 } else if (childDimension == LayoutParams.MATCH_PARENT) { 4694 // Child wants to be our size... find out how big it should 4695 // be 4696 resultSize = 0; 4697 resultMode = MeasureSpec.UNSPECIFIED; 4698 } else if (childDimension == LayoutParams.WRAP_CONTENT) { 4699 // Child wants to determine its own size.... find out how 4700 // big it should be 4701 resultSize = 0; 4702 resultMode = MeasureSpec.UNSPECIFIED; 4703 } 4704 break; 4705 } 4706 return MeasureSpec.makeMeasureSpec(resultSize, resultMode); 4707 } 4708 4709 4710 /** 4711 * Removes any pending animations for views that have been removed. Call 4712 * this if you don't want animations for exiting views to stack up. 4713 */ 4714 public void clearDisappearingChildren() { 4715 if (mDisappearingChildren != null) { 4716 mDisappearingChildren.clear(); 4717 } 4718 } 4719 4720 /** 4721 * Add a view which is removed from mChildren but still needs animation 4722 * 4723 * @param v View to add 4724 */ 4725 private void addDisappearingView(View v) { 4726 ArrayList<View> disappearingChildren = mDisappearingChildren; 4727 4728 if (disappearingChildren == null) { 4729 disappearingChildren = mDisappearingChildren = new ArrayList<View>(); 4730 } 4731 4732 disappearingChildren.add(v); 4733 } 4734 4735 /** 4736 * Cleanup a view when its animation is done. This may mean removing it from 4737 * the list of disappearing views. 4738 * 4739 * @param view The view whose animation has finished 4740 * @param animation The animation, cannot be null 4741 */ 4742 private void finishAnimatingView(final View view, Animation animation) { 4743 final ArrayList<View> disappearingChildren = mDisappearingChildren; 4744 if (disappearingChildren != null) { 4745 if (disappearingChildren.contains(view)) { 4746 disappearingChildren.remove(view); 4747 4748 if (view.mAttachInfo != null) { 4749 view.dispatchDetachedFromWindow(); 4750 } 4751 4752 view.clearAnimation(); 4753 mGroupFlags |= FLAG_INVALIDATE_REQUIRED; 4754 } 4755 } 4756 4757 if (animation != null && !animation.getFillAfter()) { 4758 view.clearAnimation(); 4759 } 4760 4761 if ((view.mPrivateFlags & ANIMATION_STARTED) == ANIMATION_STARTED) { 4762 view.onAnimationEnd(); 4763 // Should be performed by onAnimationEnd() but this avoid an infinite loop, 4764 // so we'd rather be safe than sorry 4765 view.mPrivateFlags &= ~ANIMATION_STARTED; 4766 // Draw one more frame after the animation is done 4767 mGroupFlags |= FLAG_INVALIDATE_REQUIRED; 4768 } 4769 } 4770 4771 /** 4772 * Utility function called by View during invalidation to determine whether a view that 4773 * is invisible or gone should still be invalidated because it is being transitioned (and 4774 * therefore still needs to be drawn). 4775 */ 4776 boolean isViewTransitioning(View view) { 4777 return (mTransitioningViews != null && mTransitioningViews.contains(view)); 4778 } 4779 4780 /** 4781 * This method tells the ViewGroup that the given View object, which should have this 4782 * ViewGroup as its parent, 4783 * should be kept around (re-displayed when the ViewGroup draws its children) even if it 4784 * is removed from its parent. This allows animations, such as those used by 4785 * {@link android.app.Fragment} and {@link android.animation.LayoutTransition} to animate 4786 * the removal of views. A call to this method should always be accompanied by a later call 4787 * to {@link #endViewTransition(View)}, such as after an animation on the View has finished, 4788 * so that the View finally gets removed. 4789 * 4790 * @param view The View object to be kept visible even if it gets removed from its parent. 4791 */ 4792 public void startViewTransition(View view) { 4793 if (view.mParent == this) { 4794 if (mTransitioningViews == null) { 4795 mTransitioningViews = new ArrayList<View>(); 4796 } 4797 mTransitioningViews.add(view); 4798 } 4799 } 4800 4801 /** 4802 * This method should always be called following an earlier call to 4803 * {@link #startViewTransition(View)}. The given View is finally removed from its parent 4804 * and will no longer be displayed. Note that this method does not perform the functionality 4805 * of removing a view from its parent; it just discontinues the display of a View that 4806 * has previously been removed. 4807 * 4808 * @return view The View object that has been removed but is being kept around in the visible 4809 * hierarchy by an earlier call to {@link #startViewTransition(View)}. 4810 */ 4811 public void endViewTransition(View view) { 4812 if (mTransitioningViews != null) { 4813 mTransitioningViews.remove(view); 4814 final ArrayList<View> disappearingChildren = mDisappearingChildren; 4815 if (disappearingChildren != null && disappearingChildren.contains(view)) { 4816 disappearingChildren.remove(view); 4817 if (mVisibilityChangingChildren != null && 4818 mVisibilityChangingChildren.contains(view)) { 4819 mVisibilityChangingChildren.remove(view); 4820 } else { 4821 if (view.mAttachInfo != null) { 4822 view.dispatchDetachedFromWindow(); 4823 } 4824 if (view.mParent != null) { 4825 view.mParent = null; 4826 } 4827 } 4828 mGroupFlags |= FLAG_INVALIDATE_REQUIRED; 4829 } 4830 } 4831 } 4832 4833 private LayoutTransition.TransitionListener mLayoutTransitionListener = 4834 new LayoutTransition.TransitionListener() { 4835 @Override 4836 public void startTransition(LayoutTransition transition, ViewGroup container, 4837 View view, int transitionType) { 4838 // We only care about disappearing items, since we need special logic to keep 4839 // those items visible after they've been 'removed' 4840 if (transitionType == LayoutTransition.DISAPPEARING) { 4841 startViewTransition(view); 4842 } 4843 } 4844 4845 @Override 4846 public void endTransition(LayoutTransition transition, ViewGroup container, 4847 View view, int transitionType) { 4848 if (mLayoutSuppressed && !transition.isChangingLayout()) { 4849 requestLayout(); 4850 mLayoutSuppressed = false; 4851 } 4852 if (transitionType == LayoutTransition.DISAPPEARING && mTransitioningViews != null) { 4853 endViewTransition(view); 4854 } 4855 } 4856 }; 4857 4858 /** 4859 * {@inheritDoc} 4860 */ 4861 @Override 4862 public boolean gatherTransparentRegion(Region region) { 4863 // If no transparent regions requested, we are always opaque. 4864 final boolean meOpaque = (mPrivateFlags & View.REQUEST_TRANSPARENT_REGIONS) == 0; 4865 if (meOpaque && region == null) { 4866 // The caller doesn't care about the region, so stop now. 4867 return true; 4868 } 4869 super.gatherTransparentRegion(region); 4870 final View[] children = mChildren; 4871 final int count = mChildrenCount; 4872 boolean noneOfTheChildrenAreTransparent = true; 4873 for (int i = 0; i < count; i++) { 4874 final View child = children[i]; 4875 if ((child.mViewFlags & VISIBILITY_MASK) == VISIBLE || child.getAnimation() != null) { 4876 if (!child.gatherTransparentRegion(region)) { 4877 noneOfTheChildrenAreTransparent = false; 4878 } 4879 } 4880 } 4881 return meOpaque || noneOfTheChildrenAreTransparent; 4882 } 4883 4884 /** 4885 * {@inheritDoc} 4886 */ 4887 public void requestTransparentRegion(View child) { 4888 if (child != null) { 4889 child.mPrivateFlags |= View.REQUEST_TRANSPARENT_REGIONS; 4890 if (mParent != null) { 4891 mParent.requestTransparentRegion(this); 4892 } 4893 } 4894 } 4895 4896 4897 @Override 4898 protected boolean fitSystemWindows(Rect insets) { 4899 boolean done = super.fitSystemWindows(insets); 4900 if (!done) { 4901 final int count = mChildrenCount; 4902 final View[] children = mChildren; 4903 for (int i = 0; i < count; i++) { 4904 done = children[i].fitSystemWindows(insets); 4905 if (done) { 4906 break; 4907 } 4908 } 4909 } 4910 return done; 4911 } 4912 4913 /** 4914 * Returns the animation listener to which layout animation events are 4915 * sent. 4916 * 4917 * @return an {@link android.view.animation.Animation.AnimationListener} 4918 */ 4919 public Animation.AnimationListener getLayoutAnimationListener() { 4920 return mAnimationListener; 4921 } 4922 4923 @Override 4924 protected void drawableStateChanged() { 4925 super.drawableStateChanged(); 4926 4927 if ((mGroupFlags & FLAG_NOTIFY_CHILDREN_ON_DRAWABLE_STATE_CHANGE) != 0) { 4928 if ((mGroupFlags & FLAG_ADD_STATES_FROM_CHILDREN) != 0) { 4929 throw new IllegalStateException("addStateFromChildren cannot be enabled if a" 4930 + " child has duplicateParentState set to true"); 4931 } 4932 4933 final View[] children = mChildren; 4934 final int count = mChildrenCount; 4935 4936 for (int i = 0; i < count; i++) { 4937 final View child = children[i]; 4938 if ((child.mViewFlags & DUPLICATE_PARENT_STATE) != 0) { 4939 child.refreshDrawableState(); 4940 } 4941 } 4942 } 4943 } 4944 4945 @Override 4946 public void jumpDrawablesToCurrentState() { 4947 super.jumpDrawablesToCurrentState(); 4948 final View[] children = mChildren; 4949 final int count = mChildrenCount; 4950 for (int i = 0; i < count; i++) { 4951 children[i].jumpDrawablesToCurrentState(); 4952 } 4953 } 4954 4955 @Override 4956 protected int[] onCreateDrawableState(int extraSpace) { 4957 if ((mGroupFlags & FLAG_ADD_STATES_FROM_CHILDREN) == 0) { 4958 return super.onCreateDrawableState(extraSpace); 4959 } 4960 4961 int need = 0; 4962 int n = getChildCount(); 4963 for (int i = 0; i < n; i++) { 4964 int[] childState = getChildAt(i).getDrawableState(); 4965 4966 if (childState != null) { 4967 need += childState.length; 4968 } 4969 } 4970 4971 int[] state = super.onCreateDrawableState(extraSpace + need); 4972 4973 for (int i = 0; i < n; i++) { 4974 int[] childState = getChildAt(i).getDrawableState(); 4975 4976 if (childState != null) { 4977 state = mergeDrawableStates(state, childState); 4978 } 4979 } 4980 4981 return state; 4982 } 4983 4984 /** 4985 * Sets whether this ViewGroup's drawable states also include 4986 * its children's drawable states. This is used, for example, to 4987 * make a group appear to be focused when its child EditText or button 4988 * is focused. 4989 */ 4990 public void setAddStatesFromChildren(boolean addsStates) { 4991 if (addsStates) { 4992 mGroupFlags |= FLAG_ADD_STATES_FROM_CHILDREN; 4993 } else { 4994 mGroupFlags &= ~FLAG_ADD_STATES_FROM_CHILDREN; 4995 } 4996 4997 refreshDrawableState(); 4998 } 4999 5000 /** 5001 * Returns whether this ViewGroup's drawable states also include 5002 * its children's drawable states. This is used, for example, to 5003 * make a group appear to be focused when its child EditText or button 5004 * is focused. 5005 */ 5006 public boolean addStatesFromChildren() { 5007 return (mGroupFlags & FLAG_ADD_STATES_FROM_CHILDREN) != 0; 5008 } 5009 5010 /** 5011 * If {link #addStatesFromChildren} is true, refreshes this group's 5012 * drawable state (to include the states from its children). 5013 */ 5014 public void childDrawableStateChanged(View child) { 5015 if ((mGroupFlags & FLAG_ADD_STATES_FROM_CHILDREN) != 0) { 5016 refreshDrawableState(); 5017 } 5018 } 5019 5020 /** 5021 * Specifies the animation listener to which layout animation events must 5022 * be sent. Only 5023 * {@link android.view.animation.Animation.AnimationListener#onAnimationStart(Animation)} 5024 * and 5025 * {@link android.view.animation.Animation.AnimationListener#onAnimationEnd(Animation)} 5026 * are invoked. 5027 * 5028 * @param animationListener the layout animation listener 5029 */ 5030 public void setLayoutAnimationListener(Animation.AnimationListener animationListener) { 5031 mAnimationListener = animationListener; 5032 } 5033 5034 /** 5035 * This method is called by LayoutTransition when there are 'changing' animations that need 5036 * to start after the layout/setup phase. The request is forwarded to the ViewAncestor, who 5037 * starts all pending transitions prior to the drawing phase in the current traversal. 5038 * 5039 * @param transition The LayoutTransition to be started on the next traversal. 5040 * 5041 * @hide 5042 */ 5043 public void requestTransitionStart(LayoutTransition transition) { 5044 ViewRootImpl viewAncestor = getViewRootImpl(); 5045 if (viewAncestor != null) { 5046 viewAncestor.requestTransitionStart(transition); 5047 } 5048 } 5049 5050 @Override 5051 protected void resetResolvedLayoutDirection() { 5052 super.resetResolvedLayoutDirection(); 5053 5054 // Take care of resetting the children resolution too 5055 final int count = getChildCount(); 5056 for (int i = 0; i < count; i++) { 5057 final View child = getChildAt(i); 5058 if (child.getLayoutDirection() == LAYOUT_DIRECTION_INHERIT) { 5059 child.resetResolvedLayoutDirection(); 5060 } 5061 } 5062 } 5063 5064 @Override 5065 protected void resetResolvedTextDirection() { 5066 super.resetResolvedTextDirection(); 5067 5068 // Take care of resetting the children resolution too 5069 final int count = getChildCount(); 5070 for (int i = 0; i < count; i++) { 5071 final View child = getChildAt(i); 5072 if (child.getTextDirection() == TEXT_DIRECTION_INHERIT) { 5073 child.resetResolvedTextDirection(); 5074 } 5075 } 5076 } 5077 5078 /** 5079 * Return true if the pressed state should be delayed for children or descendants of this 5080 * ViewGroup. Generally, this should be done for containers that can scroll, such as a List. 5081 * This prevents the pressed state from appearing when the user is actually trying to scroll 5082 * the content. 5083 * 5084 * The default implementation returns true for compatibility reasons. Subclasses that do 5085 * not scroll should generally override this method and return false. 5086 */ 5087 public boolean shouldDelayChildPressedState() { 5088 return true; 5089 } 5090 5091 /** 5092 * LayoutParams are used by views to tell their parents how they want to be 5093 * laid out. See 5094 * {@link android.R.styleable#ViewGroup_Layout ViewGroup Layout Attributes} 5095 * for a list of all child view attributes that this class supports. 5096 * 5097 * <p> 5098 * The base LayoutParams class just describes how big the view wants to be 5099 * for both width and height. For each dimension, it can specify one of: 5100 * <ul> 5101 * <li>FILL_PARENT (renamed MATCH_PARENT in API Level 8 and higher), which 5102 * means that the view wants to be as big as its parent (minus padding) 5103 * <li> WRAP_CONTENT, which means that the view wants to be just big enough 5104 * to enclose its content (plus padding) 5105 * <li> an exact number 5106 * </ul> 5107 * There are subclasses of LayoutParams for different subclasses of 5108 * ViewGroup. For example, AbsoluteLayout has its own subclass of 5109 * LayoutParams which adds an X and Y value. 5110 * 5111 * @attr ref android.R.styleable#ViewGroup_Layout_layout_height 5112 * @attr ref android.R.styleable#ViewGroup_Layout_layout_width 5113 */ 5114 public static class LayoutParams { 5115 /** 5116 * Special value for the height or width requested by a View. 5117 * FILL_PARENT means that the view wants to be as big as its parent, 5118 * minus the parent's padding, if any. This value is deprecated 5119 * starting in API Level 8 and replaced by {@link #MATCH_PARENT}. 5120 */ 5121 @SuppressWarnings({"UnusedDeclaration"}) 5122 @Deprecated 5123 public static final int FILL_PARENT = -1; 5124 5125 /** 5126 * Special value for the height or width requested by a View. 5127 * MATCH_PARENT means that the view wants to be as big as its parent, 5128 * minus the parent's padding, if any. Introduced in API Level 8. 5129 */ 5130 public static final int MATCH_PARENT = -1; 5131 5132 /** 5133 * Special value for the height or width requested by a View. 5134 * WRAP_CONTENT means that the view wants to be just large enough to fit 5135 * its own internal content, taking its own padding into account. 5136 */ 5137 public static final int WRAP_CONTENT = -2; 5138 5139 /** 5140 * Information about how wide the view wants to be. Can be one of the 5141 * constants FILL_PARENT (replaced by MATCH_PARENT , 5142 * in API Level 8) or WRAP_CONTENT. or an exact size. 5143 */ 5144 @ViewDebug.ExportedProperty(category = "layout", mapping = { 5145 @ViewDebug.IntToString(from = MATCH_PARENT, to = "MATCH_PARENT"), 5146 @ViewDebug.IntToString(from = WRAP_CONTENT, to = "WRAP_CONTENT") 5147 }) 5148 public int width; 5149 5150 /** 5151 * Information about how tall the view wants to be. Can be one of the 5152 * constants FILL_PARENT (replaced by MATCH_PARENT , 5153 * in API Level 8) or WRAP_CONTENT. or an exact size. 5154 */ 5155 @ViewDebug.ExportedProperty(category = "layout", mapping = { 5156 @ViewDebug.IntToString(from = MATCH_PARENT, to = "MATCH_PARENT"), 5157 @ViewDebug.IntToString(from = WRAP_CONTENT, to = "WRAP_CONTENT") 5158 }) 5159 public int height; 5160 5161 /** 5162 * Used to animate layouts. 5163 */ 5164 public LayoutAnimationController.AnimationParameters layoutAnimationParameters; 5165 5166 /** 5167 * Creates a new set of layout parameters. The values are extracted from 5168 * the supplied attributes set and context. The XML attributes mapped 5169 * to this set of layout parameters are: 5170 * 5171 * <ul> 5172 * <li><code>layout_width</code>: the width, either an exact value, 5173 * {@link #WRAP_CONTENT}, or {@link #FILL_PARENT} (replaced by 5174 * {@link #MATCH_PARENT} in API Level 8)</li> 5175 * <li><code>layout_height</code>: the height, either an exact value, 5176 * {@link #WRAP_CONTENT}, or {@link #FILL_PARENT} (replaced by 5177 * {@link #MATCH_PARENT} in API Level 8)</li> 5178 * </ul> 5179 * 5180 * @param c the application environment 5181 * @param attrs the set of attributes from which to extract the layout 5182 * parameters' values 5183 */ 5184 public LayoutParams(Context c, AttributeSet attrs) { 5185 TypedArray a = c.obtainStyledAttributes(attrs, R.styleable.ViewGroup_Layout); 5186 setBaseAttributes(a, 5187 R.styleable.ViewGroup_Layout_layout_width, 5188 R.styleable.ViewGroup_Layout_layout_height); 5189 a.recycle(); 5190 } 5191 5192 /** 5193 * Creates a new set of layout parameters with the specified width 5194 * and height. 5195 * 5196 * @param width the width, either {@link #WRAP_CONTENT}, 5197 * {@link #FILL_PARENT} (replaced by {@link #MATCH_PARENT} in 5198 * API Level 8), or a fixed size in pixels 5199 * @param height the height, either {@link #WRAP_CONTENT}, 5200 * {@link #FILL_PARENT} (replaced by {@link #MATCH_PARENT} in 5201 * API Level 8), or a fixed size in pixels 5202 */ 5203 public LayoutParams(int width, int height) { 5204 this.width = width; 5205 this.height = height; 5206 } 5207 5208 /** 5209 * Copy constructor. Clones the width and height values of the source. 5210 * 5211 * @param source The layout params to copy from. 5212 */ 5213 public LayoutParams(LayoutParams source) { 5214 this.width = source.width; 5215 this.height = source.height; 5216 } 5217 5218 /** 5219 * Used internally by MarginLayoutParams. 5220 * @hide 5221 */ 5222 LayoutParams() { 5223 } 5224 5225 /** 5226 * Extracts the layout parameters from the supplied attributes. 5227 * 5228 * @param a the style attributes to extract the parameters from 5229 * @param widthAttr the identifier of the width attribute 5230 * @param heightAttr the identifier of the height attribute 5231 */ 5232 protected void setBaseAttributes(TypedArray a, int widthAttr, int heightAttr) { 5233 width = a.getLayoutDimension(widthAttr, "layout_width"); 5234 height = a.getLayoutDimension(heightAttr, "layout_height"); 5235 } 5236 5237 /** 5238 * Resolve layout parameters depending on the layout direction. Subclasses that care about 5239 * layoutDirection changes should override this method. The default implementation does 5240 * nothing. 5241 * 5242 * @param layoutDirection the direction of the layout 5243 * 5244 * {@link View#LAYOUT_DIRECTION_LTR} 5245 * {@link View#LAYOUT_DIRECTION_RTL} 5246 * 5247 * @hide 5248 */ 5249 protected void resolveWithDirection(int layoutDirection) { 5250 } 5251 5252 /** 5253 * Returns a String representation of this set of layout parameters. 5254 * 5255 * @param output the String to prepend to the internal representation 5256 * @return a String with the following format: output + 5257 * "ViewGroup.LayoutParams={ width=WIDTH, height=HEIGHT }" 5258 * 5259 * @hide 5260 */ 5261 public String debug(String output) { 5262 return output + "ViewGroup.LayoutParams={ width=" 5263 + sizeToString(width) + ", height=" + sizeToString(height) + " }"; 5264 } 5265 5266 /** 5267 * Converts the specified size to a readable String. 5268 * 5269 * @param size the size to convert 5270 * @return a String instance representing the supplied size 5271 * 5272 * @hide 5273 */ 5274 protected static String sizeToString(int size) { 5275 if (size == WRAP_CONTENT) { 5276 return "wrap-content"; 5277 } 5278 if (size == MATCH_PARENT) { 5279 return "match-parent"; 5280 } 5281 return String.valueOf(size); 5282 } 5283 } 5284 5285 /** 5286 * Per-child layout information for layouts that support margins. 5287 * See 5288 * {@link android.R.styleable#ViewGroup_MarginLayout ViewGroup Margin Layout Attributes} 5289 * for a list of all child view attributes that this class supports. 5290 */ 5291 public static class MarginLayoutParams extends ViewGroup.LayoutParams { 5292 /** 5293 * The left margin in pixels of the child. Whenever this value is changed, a call to 5294 * {@link android.view.View#requestLayout()} needs to be done. 5295 */ 5296 @ViewDebug.ExportedProperty(category = "layout") 5297 public int leftMargin; 5298 5299 /** 5300 * The top margin in pixels of the child. Whenever this value is changed, a call to 5301 * {@link android.view.View#requestLayout()} needs to be done. 5302 */ 5303 @ViewDebug.ExportedProperty(category = "layout") 5304 public int topMargin; 5305 5306 /** 5307 * The right margin in pixels of the child. Whenever this value is changed, a call to 5308 * {@link android.view.View#requestLayout()} needs to be done. 5309 */ 5310 @ViewDebug.ExportedProperty(category = "layout") 5311 public int rightMargin; 5312 5313 /** 5314 * The bottom margin in pixels of the child. Whenever this value is changed, a call to 5315 * {@link android.view.View#requestLayout()} needs to be done. 5316 */ 5317 @ViewDebug.ExportedProperty(category = "layout") 5318 public int bottomMargin; 5319 5320 /** 5321 * The start margin in pixels of the child. 5322 * 5323 * @hide 5324 * 5325 */ 5326 @ViewDebug.ExportedProperty(category = "layout") 5327 protected int startMargin = DEFAULT_RELATIVE; 5328 5329 /** 5330 * The end margin in pixels of the child. 5331 * 5332 * @hide 5333 */ 5334 @ViewDebug.ExportedProperty(category = "layout") 5335 protected int endMargin = DEFAULT_RELATIVE; 5336 5337 /** 5338 * The default start and end margin. 5339 */ 5340 static private final int DEFAULT_RELATIVE = Integer.MIN_VALUE; 5341 5342 /** 5343 * Creates a new set of layout parameters. The values are extracted from 5344 * the supplied attributes set and context. 5345 * 5346 * @param c the application environment 5347 * @param attrs the set of attributes from which to extract the layout 5348 * parameters' values 5349 */ 5350 public MarginLayoutParams(Context c, AttributeSet attrs) { 5351 super(); 5352 5353 TypedArray a = c.obtainStyledAttributes(attrs, R.styleable.ViewGroup_MarginLayout); 5354 setBaseAttributes(a, 5355 R.styleable.ViewGroup_MarginLayout_layout_width, 5356 R.styleable.ViewGroup_MarginLayout_layout_height); 5357 5358 int margin = a.getDimensionPixelSize( 5359 com.android.internal.R.styleable.ViewGroup_MarginLayout_layout_margin, -1); 5360 if (margin >= 0) { 5361 leftMargin = margin; 5362 topMargin = margin; 5363 rightMargin= margin; 5364 bottomMargin = margin; 5365 } else { 5366 leftMargin = a.getDimensionPixelSize( 5367 R.styleable.ViewGroup_MarginLayout_layout_marginLeft, 0); 5368 topMargin = a.getDimensionPixelSize( 5369 R.styleable.ViewGroup_MarginLayout_layout_marginTop, 0); 5370 rightMargin = a.getDimensionPixelSize( 5371 R.styleable.ViewGroup_MarginLayout_layout_marginRight, 0); 5372 bottomMargin = a.getDimensionPixelSize( 5373 R.styleable.ViewGroup_MarginLayout_layout_marginBottom, 0); 5374 startMargin = a.getDimensionPixelSize( 5375 R.styleable.ViewGroup_MarginLayout_layout_marginStart, DEFAULT_RELATIVE); 5376 endMargin = a.getDimensionPixelSize( 5377 R.styleable.ViewGroup_MarginLayout_layout_marginEnd, DEFAULT_RELATIVE); 5378 } 5379 5380 a.recycle(); 5381 } 5382 5383 /** 5384 * {@inheritDoc} 5385 */ 5386 public MarginLayoutParams(int width, int height) { 5387 super(width, height); 5388 } 5389 5390 /** 5391 * Copy constructor. Clones the width, height and margin values of the source. 5392 * 5393 * @param source The layout params to copy from. 5394 */ 5395 public MarginLayoutParams(MarginLayoutParams source) { 5396 this.width = source.width; 5397 this.height = source.height; 5398 5399 this.leftMargin = source.leftMargin; 5400 this.topMargin = source.topMargin; 5401 this.rightMargin = source.rightMargin; 5402 this.bottomMargin = source.bottomMargin; 5403 this.startMargin = source.startMargin; 5404 this.endMargin = source.endMargin; 5405 } 5406 5407 /** 5408 * {@inheritDoc} 5409 */ 5410 public MarginLayoutParams(LayoutParams source) { 5411 super(source); 5412 } 5413 5414 /** 5415 * Sets the margins, in pixels. A call to {@link android.view.View#requestLayout()} needs 5416 * to be done so that the new margins are taken into account. Left and right margins may be 5417 * overriden by {@link android.view.View#requestLayout()} depending on layout direction. 5418 * 5419 * @param left the left margin size 5420 * @param top the top margin size 5421 * @param right the right margin size 5422 * @param bottom the bottom margin size 5423 * 5424 * @attr ref android.R.styleable#ViewGroup_MarginLayout_layout_marginLeft 5425 * @attr ref android.R.styleable#ViewGroup_MarginLayout_layout_marginTop 5426 * @attr ref android.R.styleable#ViewGroup_MarginLayout_layout_marginRight 5427 * @attr ref android.R.styleable#ViewGroup_MarginLayout_layout_marginBottom 5428 */ 5429 public void setMargins(int left, int top, int right, int bottom) { 5430 leftMargin = left; 5431 topMargin = top; 5432 rightMargin = right; 5433 bottomMargin = bottom; 5434 } 5435 5436 /** 5437 * Sets the relative margins, in pixels. A call to {@link android.view.View#requestLayout()} 5438 * needs to be done so that the new relative margins are taken into account. Left and right 5439 * margins may be overriden by {@link android.view.View#requestLayout()} depending on layout 5440 * direction. 5441 * 5442 * @param start the start margin size 5443 * @param top the top margin size 5444 * @param end the right margin size 5445 * @param bottom the bottom margin size 5446 * 5447 * @attr ref android.R.styleable#ViewGroup_MarginLayout_layout_marginStart 5448 * @attr ref android.R.styleable#ViewGroup_MarginLayout_layout_marginTop 5449 * @attr ref android.R.styleable#ViewGroup_MarginLayout_layout_marginEnd 5450 * @attr ref android.R.styleable#ViewGroup_MarginLayout_layout_marginBottom 5451 * 5452 * @hide 5453 */ 5454 public void setMarginsRelative(int start, int top, int end, int bottom) { 5455 startMargin = start; 5456 topMargin = top; 5457 endMargin = end; 5458 bottomMargin = bottom; 5459 } 5460 5461 /** 5462 * Returns the start margin in pixels. 5463 * 5464 * @attr ref android.R.styleable#ViewGroup_MarginLayout_layout_marginStart 5465 * 5466 * @return the start margin in pixels. 5467 * 5468 * @hide 5469 */ 5470 public int getMarginStart() { 5471 return startMargin; 5472 } 5473 5474 /** 5475 * Returns the end margin in pixels. 5476 * 5477 * @attr ref android.R.styleable#ViewGroup_MarginLayout_layout_marginEnd 5478 * 5479 * @return the end margin in pixels. 5480 * 5481 * @hide 5482 */ 5483 public int getMarginEnd() { 5484 return endMargin; 5485 } 5486 5487 /** 5488 * Check if margins are relative. 5489 * 5490 * @attr ref android.R.styleable#ViewGroup_MarginLayout_layout_marginStart 5491 * @attr ref android.R.styleable#ViewGroup_MarginLayout_layout_marginEnd 5492 * 5493 * @return true if either marginStart or marginEnd has been set 5494 * 5495 * @hide 5496 */ 5497 public boolean isMarginRelative() { 5498 return (startMargin != DEFAULT_RELATIVE) || (endMargin != DEFAULT_RELATIVE); 5499 } 5500 5501 /** 5502 * This will be called by {@link android.view.View#requestLayout()}. Left and Right margins 5503 * maybe overriden depending on layout direction. 5504 * 5505 * @hide 5506 */ 5507 @Override 5508 protected void resolveWithDirection(int layoutDirection) { 5509 switch(layoutDirection) { 5510 case View.LAYOUT_DIRECTION_RTL: 5511 leftMargin = (endMargin > DEFAULT_RELATIVE) ? endMargin : leftMargin; 5512 rightMargin = (startMargin > DEFAULT_RELATIVE) ? startMargin : rightMargin; 5513 break; 5514 case View.LAYOUT_DIRECTION_LTR: 5515 default: 5516 leftMargin = (startMargin > DEFAULT_RELATIVE) ? startMargin : leftMargin; 5517 rightMargin = (endMargin > DEFAULT_RELATIVE) ? endMargin : rightMargin; 5518 break; 5519 } 5520 } 5521 } 5522 5523 /* Describes a touched view and the ids of the pointers that it has captured. 5524 * 5525 * This code assumes that pointer ids are always in the range 0..31 such that 5526 * it can use a bitfield to track which pointer ids are present. 5527 * As it happens, the lower layers of the input dispatch pipeline also use the 5528 * same trick so the assumption should be safe here... 5529 */ 5530 private static final class TouchTarget { 5531 private static final int MAX_RECYCLED = 32; 5532 private static final Object sRecycleLock = new Object(); 5533 private static TouchTarget sRecycleBin; 5534 private static int sRecycledCount; 5535 5536 public static final int ALL_POINTER_IDS = -1; // all ones 5537 5538 // The touched child view. 5539 public View child; 5540 5541 // The combined bit mask of pointer ids for all pointers captured by the target. 5542 public int pointerIdBits; 5543 5544 // The next target in the target list. 5545 public TouchTarget next; 5546 5547 private TouchTarget() { 5548 } 5549 5550 public static TouchTarget obtain(View child, int pointerIdBits) { 5551 final TouchTarget target; 5552 synchronized (sRecycleLock) { 5553 if (sRecycleBin == null) { 5554 target = new TouchTarget(); 5555 } else { 5556 target = sRecycleBin; 5557 sRecycleBin = target.next; 5558 sRecycledCount--; 5559 target.next = null; 5560 } 5561 } 5562 target.child = child; 5563 target.pointerIdBits = pointerIdBits; 5564 return target; 5565 } 5566 5567 public void recycle() { 5568 synchronized (sRecycleLock) { 5569 if (sRecycledCount < MAX_RECYCLED) { 5570 next = sRecycleBin; 5571 sRecycleBin = this; 5572 sRecycledCount += 1; 5573 } else { 5574 next = null; 5575 } 5576 child = null; 5577 } 5578 } 5579 } 5580 5581 /* Describes a hovered view. */ 5582 private static final class HoverTarget { 5583 private static final int MAX_RECYCLED = 32; 5584 private static final Object sRecycleLock = new Object(); 5585 private static HoverTarget sRecycleBin; 5586 private static int sRecycledCount; 5587 5588 // The hovered child view. 5589 public View child; 5590 5591 // The next target in the target list. 5592 public HoverTarget next; 5593 5594 private HoverTarget() { 5595 } 5596 5597 public static HoverTarget obtain(View child) { 5598 final HoverTarget target; 5599 synchronized (sRecycleLock) { 5600 if (sRecycleBin == null) { 5601 target = new HoverTarget(); 5602 } else { 5603 target = sRecycleBin; 5604 sRecycleBin = target.next; 5605 sRecycledCount--; 5606 target.next = null; 5607 } 5608 } 5609 target.child = child; 5610 return target; 5611 } 5612 5613 public void recycle() { 5614 synchronized (sRecycleLock) { 5615 if (sRecycledCount < MAX_RECYCLED) { 5616 next = sRecycleBin; 5617 sRecycleBin = this; 5618 sRecycledCount += 1; 5619 } else { 5620 next = null; 5621 } 5622 child = null; 5623 } 5624 } 5625 } 5626} 5627