ViewGroup.java revision 6dd005b48138708762bfade0081d031a2a4a3822
1/* 2 * Copyright (C) 2006 The Android Open Source Project 3 * 4 * Licensed under the Apache License, Version 2.0 (the "License"); 5 * you may not use this file except in compliance with the License. 6 * You may obtain a copy of the License at 7 * 8 * http://www.apache.org/licenses/LICENSE-2.0 9 * 10 * Unless required by applicable law or agreed to in writing, software 11 * distributed under the License is distributed on an "AS IS" BASIS, 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 13 * See the License for the specific language governing permissions and 14 * limitations under the License. 15 */ 16 17package android.view; 18 19import android.animation.LayoutTransition; 20import android.content.Context; 21import android.content.res.Configuration; 22import android.content.res.TypedArray; 23import android.graphics.Bitmap; 24import android.graphics.Canvas; 25import android.graphics.Matrix; 26import android.graphics.Paint; 27import android.graphics.PointF; 28import android.graphics.Rect; 29import android.graphics.RectF; 30import android.graphics.Region; 31import android.os.Build; 32import android.os.Parcelable; 33import android.os.SystemClock; 34import android.util.AttributeSet; 35import android.util.Log; 36import android.util.SparseArray; 37import android.view.accessibility.AccessibilityEvent; 38import android.view.accessibility.AccessibilityNodeInfo; 39import android.view.animation.AlphaAnimation; 40import android.view.animation.Animation; 41import android.view.animation.AnimationUtils; 42import android.view.animation.LayoutAnimationController; 43import android.view.animation.Transformation; 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 * 611 * @param child The child which requests sending the event. 612 * @param event The event to be sent. 613 * @return True if the event should be sent. 614 * 615 * @see #requestSendAccessibilityEvent(View, AccessibilityEvent) 616 */ 617 public boolean onRequestSendAccessibilityEvent(View child, AccessibilityEvent event) { 618 return true; 619 } 620 621 /** 622 * {@inheritDoc} 623 */ 624 @Override 625 public boolean dispatchUnhandledMove(View focused, int direction) { 626 return mFocused != null && 627 mFocused.dispatchUnhandledMove(focused, direction); 628 } 629 630 /** 631 * {@inheritDoc} 632 */ 633 public void clearChildFocus(View child) { 634 if (DBG) { 635 System.out.println(this + " clearChildFocus()"); 636 } 637 638 mFocused = null; 639 if (mParent != null) { 640 mParent.clearChildFocus(this); 641 } 642 } 643 644 /** 645 * {@inheritDoc} 646 */ 647 @Override 648 public void clearFocus() { 649 super.clearFocus(); 650 651 // clear any child focus if it exists 652 if (mFocused != null) { 653 mFocused.clearFocus(); 654 } 655 } 656 657 /** 658 * {@inheritDoc} 659 */ 660 @Override 661 void unFocus() { 662 if (DBG) { 663 System.out.println(this + " unFocus()"); 664 } 665 666 super.unFocus(); 667 if (mFocused != null) { 668 mFocused.unFocus(); 669 } 670 mFocused = null; 671 } 672 673 /** 674 * Returns the focused child of this view, if any. The child may have focus 675 * or contain focus. 676 * 677 * @return the focused child or null. 678 */ 679 public View getFocusedChild() { 680 return mFocused; 681 } 682 683 /** 684 * Returns true if this view has or contains focus 685 * 686 * @return true if this view has or contains focus 687 */ 688 @Override 689 public boolean hasFocus() { 690 return (mPrivateFlags & FOCUSED) != 0 || mFocused != null; 691 } 692 693 /* 694 * (non-Javadoc) 695 * 696 * @see android.view.View#findFocus() 697 */ 698 @Override 699 public View findFocus() { 700 if (DBG) { 701 System.out.println("Find focus in " + this + ": flags=" 702 + isFocused() + ", child=" + mFocused); 703 } 704 705 if (isFocused()) { 706 return this; 707 } 708 709 if (mFocused != null) { 710 return mFocused.findFocus(); 711 } 712 return null; 713 } 714 715 /** 716 * {@inheritDoc} 717 */ 718 @Override 719 public boolean hasFocusable() { 720 if ((mViewFlags & VISIBILITY_MASK) != VISIBLE) { 721 return false; 722 } 723 724 if (isFocusable()) { 725 return true; 726 } 727 728 final int descendantFocusability = getDescendantFocusability(); 729 if (descendantFocusability != FOCUS_BLOCK_DESCENDANTS) { 730 final int count = mChildrenCount; 731 final View[] children = mChildren; 732 733 for (int i = 0; i < count; i++) { 734 final View child = children[i]; 735 if (child.hasFocusable()) { 736 return true; 737 } 738 } 739 } 740 741 return false; 742 } 743 744 /** 745 * {@inheritDoc} 746 */ 747 @Override 748 public void addFocusables(ArrayList<View> views, int direction) { 749 addFocusables(views, direction, FOCUSABLES_TOUCH_MODE); 750 } 751 752 /** 753 * {@inheritDoc} 754 */ 755 @Override 756 public void addFocusables(ArrayList<View> views, int direction, int focusableMode) { 757 final int focusableCount = views.size(); 758 759 final int descendantFocusability = getDescendantFocusability(); 760 761 if (descendantFocusability != FOCUS_BLOCK_DESCENDANTS) { 762 final int count = mChildrenCount; 763 final View[] children = mChildren; 764 765 for (int i = 0; i < count; i++) { 766 final View child = children[i]; 767 if ((child.mViewFlags & VISIBILITY_MASK) == VISIBLE) { 768 child.addFocusables(views, direction, focusableMode); 769 } 770 } 771 } 772 773 // we add ourselves (if focusable) in all cases except for when we are 774 // FOCUS_AFTER_DESCENDANTS and there are some descendants focusable. this is 775 // to avoid the focus search finding layouts when a more precise search 776 // among the focusable children would be more interesting. 777 if ( 778 descendantFocusability != FOCUS_AFTER_DESCENDANTS || 779 // No focusable descendants 780 (focusableCount == views.size())) { 781 super.addFocusables(views, direction, focusableMode); 782 } 783 } 784 785 @Override 786 public void findViewsWithText(ArrayList<View> outViews, CharSequence text) { 787 final int childrenCount = mChildrenCount; 788 final View[] children = mChildren; 789 for (int i = 0; i < childrenCount; i++) { 790 View child = children[i]; 791 if ((child.mViewFlags & VISIBILITY_MASK) == VISIBLE) { 792 child.findViewsWithText(outViews, text); 793 } 794 } 795 } 796 797 /** 798 * {@inheritDoc} 799 */ 800 @Override 801 public void dispatchWindowFocusChanged(boolean hasFocus) { 802 super.dispatchWindowFocusChanged(hasFocus); 803 final int count = mChildrenCount; 804 final View[] children = mChildren; 805 for (int i = 0; i < count; i++) { 806 children[i].dispatchWindowFocusChanged(hasFocus); 807 } 808 } 809 810 /** 811 * {@inheritDoc} 812 */ 813 @Override 814 public void addTouchables(ArrayList<View> views) { 815 super.addTouchables(views); 816 817 final int count = mChildrenCount; 818 final View[] children = mChildren; 819 820 for (int i = 0; i < count; i++) { 821 final View child = children[i]; 822 if ((child.mViewFlags & VISIBILITY_MASK) == VISIBLE) { 823 child.addTouchables(views); 824 } 825 } 826 } 827 828 /** 829 * {@inheritDoc} 830 */ 831 @Override 832 public void dispatchDisplayHint(int hint) { 833 super.dispatchDisplayHint(hint); 834 final int count = mChildrenCount; 835 final View[] children = mChildren; 836 for (int i = 0; i < count; i++) { 837 children[i].dispatchDisplayHint(hint); 838 } 839 } 840 841 /** 842 * @hide 843 * @param child 844 * @param visibility 845 */ 846 void onChildVisibilityChanged(View child, int visibility) { 847 if (mTransition != null) { 848 if (visibility == VISIBLE) { 849 mTransition.showChild(this, child); 850 } else { 851 mTransition.hideChild(this, child); 852 } 853 if (visibility != VISIBLE) { 854 // Only track this on disappearing views - appearing views are already visible 855 // and don't need special handling during drawChild() 856 if (mVisibilityChangingChildren == null) { 857 mVisibilityChangingChildren = new ArrayList<View>(); 858 } 859 mVisibilityChangingChildren.add(child); 860 if (mTransitioningViews != null && mTransitioningViews.contains(child)) { 861 addDisappearingView(child); 862 } 863 } 864 } 865 866 // in all cases, for drags 867 if (mCurrentDrag != null) { 868 if (visibility == VISIBLE) { 869 notifyChildOfDrag(child); 870 } 871 } 872 } 873 874 /** 875 * {@inheritDoc} 876 */ 877 @Override 878 protected void dispatchVisibilityChanged(View changedView, int visibility) { 879 super.dispatchVisibilityChanged(changedView, visibility); 880 final int count = mChildrenCount; 881 final View[] children = mChildren; 882 for (int i = 0; i < count; i++) { 883 children[i].dispatchVisibilityChanged(changedView, visibility); 884 } 885 } 886 887 /** 888 * {@inheritDoc} 889 */ 890 @Override 891 public void dispatchWindowVisibilityChanged(int visibility) { 892 super.dispatchWindowVisibilityChanged(visibility); 893 final int count = mChildrenCount; 894 final View[] children = mChildren; 895 for (int i = 0; i < count; i++) { 896 children[i].dispatchWindowVisibilityChanged(visibility); 897 } 898 } 899 900 /** 901 * {@inheritDoc} 902 */ 903 @Override 904 public void dispatchConfigurationChanged(Configuration newConfig) { 905 super.dispatchConfigurationChanged(newConfig); 906 final int count = mChildrenCount; 907 final View[] children = mChildren; 908 for (int i = 0; i < count; i++) { 909 children[i].dispatchConfigurationChanged(newConfig); 910 } 911 } 912 913 /** 914 * {@inheritDoc} 915 */ 916 public void recomputeViewAttributes(View child) { 917 if (mAttachInfo != null && !mAttachInfo.mRecomputeGlobalAttributes) { 918 ViewParent parent = mParent; 919 if (parent != null) parent.recomputeViewAttributes(this); 920 } 921 } 922 923 @Override 924 void dispatchCollectViewAttributes(int visibility) { 925 visibility |= mViewFlags&VISIBILITY_MASK; 926 super.dispatchCollectViewAttributes(visibility); 927 final int count = mChildrenCount; 928 final View[] children = mChildren; 929 for (int i = 0; i < count; i++) { 930 children[i].dispatchCollectViewAttributes(visibility); 931 } 932 } 933 934 /** 935 * {@inheritDoc} 936 */ 937 public void bringChildToFront(View child) { 938 int index = indexOfChild(child); 939 if (index >= 0) { 940 removeFromArray(index); 941 addInArray(child, mChildrenCount); 942 child.mParent = this; 943 } 944 } 945 946 /** 947 * {@inheritDoc} 948 * 949 * !!! TODO: write real docs 950 */ 951 @Override 952 public boolean dispatchDragEvent(DragEvent event) { 953 boolean retval = false; 954 final float tx = event.mX; 955 final float ty = event.mY; 956 957 ViewRootImpl root = getViewRootImpl(); 958 959 // Dispatch down the view hierarchy 960 switch (event.mAction) { 961 case DragEvent.ACTION_DRAG_STARTED: { 962 // clear state to recalculate which views we drag over 963 mCurrentDragView = null; 964 965 // Set up our tracking of drag-started notifications 966 mCurrentDrag = DragEvent.obtain(event); 967 if (mDragNotifiedChildren == null) { 968 mDragNotifiedChildren = new HashSet<View>(); 969 } else { 970 mDragNotifiedChildren.clear(); 971 } 972 973 // Now dispatch down to our children, caching the responses 974 mChildAcceptsDrag = false; 975 final int count = mChildrenCount; 976 final View[] children = mChildren; 977 for (int i = 0; i < count; i++) { 978 final View child = children[i]; 979 child.mPrivateFlags2 &= ~View.DRAG_MASK; 980 if (child.getVisibility() == VISIBLE) { 981 final boolean handled = notifyChildOfDrag(children[i]); 982 if (handled) { 983 mChildAcceptsDrag = true; 984 } 985 } 986 } 987 988 // Return HANDLED if one of our children can accept the drag 989 if (mChildAcceptsDrag) { 990 retval = true; 991 } 992 } break; 993 994 case DragEvent.ACTION_DRAG_ENDED: { 995 // Release the bookkeeping now that the drag lifecycle has ended 996 if (mDragNotifiedChildren != null) { 997 for (View child : mDragNotifiedChildren) { 998 // If a child was notified about an ongoing drag, it's told that it's over 999 child.dispatchDragEvent(event); 1000 child.mPrivateFlags2 &= ~View.DRAG_MASK; 1001 child.refreshDrawableState(); 1002 } 1003 1004 mDragNotifiedChildren.clear(); 1005 mCurrentDrag.recycle(); 1006 mCurrentDrag = null; 1007 } 1008 1009 // We consider drag-ended to have been handled if one of our children 1010 // had offered to handle the drag. 1011 if (mChildAcceptsDrag) { 1012 retval = true; 1013 } 1014 } break; 1015 1016 case DragEvent.ACTION_DRAG_LOCATION: { 1017 // Find the [possibly new] drag target 1018 final View target = findFrontmostDroppableChildAt(event.mX, event.mY, mLocalPoint); 1019 1020 // If we've changed apparent drag target, tell the view root which view 1021 // we're over now [for purposes of the eventual drag-recipient-changed 1022 // notifications to the framework] and tell the new target that the drag 1023 // has entered its bounds. The root will see setDragFocus() calls all 1024 // the way down to the final leaf view that is handling the LOCATION event 1025 // before reporting the new potential recipient to the framework. 1026 if (mCurrentDragView != target) { 1027 root.setDragFocus(target); 1028 1029 final int action = event.mAction; 1030 // If we've dragged off of a child view, send it the EXITED message 1031 if (mCurrentDragView != null) { 1032 final View view = mCurrentDragView; 1033 event.mAction = DragEvent.ACTION_DRAG_EXITED; 1034 view.dispatchDragEvent(event); 1035 view.mPrivateFlags2 &= ~View.DRAG_HOVERED; 1036 view.refreshDrawableState(); 1037 } 1038 mCurrentDragView = target; 1039 1040 // If we've dragged over a new child view, send it the ENTERED message 1041 if (target != null) { 1042 event.mAction = DragEvent.ACTION_DRAG_ENTERED; 1043 target.dispatchDragEvent(event); 1044 target.mPrivateFlags2 |= View.DRAG_HOVERED; 1045 target.refreshDrawableState(); 1046 } 1047 event.mAction = action; // restore the event's original state 1048 } 1049 1050 // Dispatch the actual drag location notice, localized into its coordinates 1051 if (target != null) { 1052 event.mX = mLocalPoint.x; 1053 event.mY = mLocalPoint.y; 1054 1055 retval = target.dispatchDragEvent(event); 1056 1057 event.mX = tx; 1058 event.mY = ty; 1059 } 1060 } break; 1061 1062 /* Entered / exited dispatch 1063 * 1064 * DRAG_ENTERED is not dispatched downwards from ViewGroup. The reason for this is 1065 * that we're about to get the corresponding LOCATION event, which we will use to 1066 * determine which of our children is the new target; at that point we will 1067 * push a DRAG_ENTERED down to the new target child [which may itself be a ViewGroup]. 1068 * 1069 * DRAG_EXITED *is* dispatched all the way down immediately: once we know the 1070 * drag has left this ViewGroup, we know by definition that every contained subview 1071 * is also no longer under the drag point. 1072 */ 1073 1074 case DragEvent.ACTION_DRAG_EXITED: { 1075 if (mCurrentDragView != null) { 1076 final View view = mCurrentDragView; 1077 view.dispatchDragEvent(event); 1078 view.mPrivateFlags2 &= ~View.DRAG_HOVERED; 1079 view.refreshDrawableState(); 1080 1081 mCurrentDragView = null; 1082 } 1083 } break; 1084 1085 case DragEvent.ACTION_DROP: { 1086 if (ViewDebug.DEBUG_DRAG) Log.d(View.VIEW_LOG_TAG, "Drop event: " + event); 1087 View target = findFrontmostDroppableChildAt(event.mX, event.mY, mLocalPoint); 1088 if (target != null) { 1089 if (ViewDebug.DEBUG_DRAG) Log.d(View.VIEW_LOG_TAG, " dispatch drop to " + target); 1090 event.mX = mLocalPoint.x; 1091 event.mY = mLocalPoint.y; 1092 retval = target.dispatchDragEvent(event); 1093 event.mX = tx; 1094 event.mY = ty; 1095 } else { 1096 if (ViewDebug.DEBUG_DRAG) { 1097 Log.d(View.VIEW_LOG_TAG, " not dropped on an accepting view"); 1098 } 1099 } 1100 } break; 1101 } 1102 1103 // If none of our children could handle the event, try here 1104 if (!retval) { 1105 // Call up to the View implementation that dispatches to installed listeners 1106 retval = super.dispatchDragEvent(event); 1107 } 1108 return retval; 1109 } 1110 1111 // Find the frontmost child view that lies under the given point, and calculate 1112 // the position within its own local coordinate system. 1113 View findFrontmostDroppableChildAt(float x, float y, PointF outLocalPoint) { 1114 final int count = mChildrenCount; 1115 final View[] children = mChildren; 1116 for (int i = count - 1; i >= 0; i--) { 1117 final View child = children[i]; 1118 if (!child.canAcceptDrag()) { 1119 continue; 1120 } 1121 1122 if (isTransformedTouchPointInView(x, y, child, outLocalPoint)) { 1123 return child; 1124 } 1125 } 1126 return null; 1127 } 1128 1129 boolean notifyChildOfDrag(View child) { 1130 if (ViewDebug.DEBUG_DRAG) { 1131 Log.d(View.VIEW_LOG_TAG, "Sending drag-started to view: " + child); 1132 } 1133 1134 boolean canAccept = false; 1135 if (! mDragNotifiedChildren.contains(child)) { 1136 mDragNotifiedChildren.add(child); 1137 canAccept = child.dispatchDragEvent(mCurrentDrag); 1138 if (canAccept && !child.canAcceptDrag()) { 1139 child.mPrivateFlags2 |= View.DRAG_CAN_ACCEPT; 1140 child.refreshDrawableState(); 1141 } 1142 } 1143 return canAccept; 1144 } 1145 1146 @Override 1147 public void dispatchSystemUiVisibilityChanged(int visible) { 1148 super.dispatchSystemUiVisibilityChanged(visible); 1149 1150 final int count = mChildrenCount; 1151 final View[] children = mChildren; 1152 for (int i=0; i <count; i++) { 1153 final View child = children[i]; 1154 child.dispatchSystemUiVisibilityChanged(visible); 1155 } 1156 } 1157 1158 /** 1159 * {@inheritDoc} 1160 */ 1161 @Override 1162 public boolean dispatchKeyEventPreIme(KeyEvent event) { 1163 if ((mPrivateFlags & (FOCUSED | HAS_BOUNDS)) == (FOCUSED | HAS_BOUNDS)) { 1164 return super.dispatchKeyEventPreIme(event); 1165 } else if (mFocused != null && (mFocused.mPrivateFlags & HAS_BOUNDS) == HAS_BOUNDS) { 1166 return mFocused.dispatchKeyEventPreIme(event); 1167 } 1168 return false; 1169 } 1170 1171 /** 1172 * {@inheritDoc} 1173 */ 1174 @Override 1175 public boolean dispatchKeyEvent(KeyEvent event) { 1176 if (mInputEventConsistencyVerifier != null) { 1177 mInputEventConsistencyVerifier.onKeyEvent(event, 1); 1178 } 1179 1180 if ((mPrivateFlags & (FOCUSED | HAS_BOUNDS)) == (FOCUSED | HAS_BOUNDS)) { 1181 if (super.dispatchKeyEvent(event)) { 1182 return true; 1183 } 1184 } else if (mFocused != null && (mFocused.mPrivateFlags & HAS_BOUNDS) == HAS_BOUNDS) { 1185 if (mFocused.dispatchKeyEvent(event)) { 1186 return true; 1187 } 1188 } 1189 1190 if (mInputEventConsistencyVerifier != null) { 1191 mInputEventConsistencyVerifier.onUnhandledEvent(event, 1); 1192 } 1193 return false; 1194 } 1195 1196 /** 1197 * {@inheritDoc} 1198 */ 1199 @Override 1200 public boolean dispatchKeyShortcutEvent(KeyEvent event) { 1201 if ((mPrivateFlags & (FOCUSED | HAS_BOUNDS)) == (FOCUSED | HAS_BOUNDS)) { 1202 return super.dispatchKeyShortcutEvent(event); 1203 } else if (mFocused != null && (mFocused.mPrivateFlags & HAS_BOUNDS) == HAS_BOUNDS) { 1204 return mFocused.dispatchKeyShortcutEvent(event); 1205 } 1206 return false; 1207 } 1208 1209 /** 1210 * {@inheritDoc} 1211 */ 1212 @Override 1213 public boolean dispatchTrackballEvent(MotionEvent event) { 1214 if (mInputEventConsistencyVerifier != null) { 1215 mInputEventConsistencyVerifier.onTrackballEvent(event, 1); 1216 } 1217 1218 if ((mPrivateFlags & (FOCUSED | HAS_BOUNDS)) == (FOCUSED | HAS_BOUNDS)) { 1219 if (super.dispatchTrackballEvent(event)) { 1220 return true; 1221 } 1222 } else if (mFocused != null && (mFocused.mPrivateFlags & HAS_BOUNDS) == HAS_BOUNDS) { 1223 if (mFocused.dispatchTrackballEvent(event)) { 1224 return true; 1225 } 1226 } 1227 1228 if (mInputEventConsistencyVerifier != null) { 1229 mInputEventConsistencyVerifier.onUnhandledEvent(event, 1); 1230 } 1231 return false; 1232 } 1233 1234 /** 1235 * {@inheritDoc} 1236 */ 1237 @SuppressWarnings({"ConstantConditions"}) 1238 @Override 1239 protected boolean dispatchHoverEvent(MotionEvent event) { 1240 final int action = event.getAction(); 1241 1242 // First check whether the view group wants to intercept the hover event. 1243 final boolean interceptHover = onInterceptHoverEvent(event); 1244 event.setAction(action); // restore action in case it was changed 1245 1246 MotionEvent eventNoHistory = event; 1247 boolean handled = false; 1248 1249 // Send events to the hovered children and build a new list of hover targets until 1250 // one is found that handles the event. 1251 HoverTarget firstOldHoverTarget = mFirstHoverTarget; 1252 mFirstHoverTarget = null; 1253 if (!interceptHover && action != MotionEvent.ACTION_HOVER_EXIT) { 1254 final float x = event.getX(); 1255 final float y = event.getY(); 1256 final int childrenCount = mChildrenCount; 1257 if (childrenCount != 0) { 1258 final View[] children = mChildren; 1259 HoverTarget lastHoverTarget = null; 1260 for (int i = childrenCount - 1; i >= 0; i--) { 1261 final View child = children[i]; 1262 if (!canViewReceivePointerEvents(child) 1263 || !isTransformedTouchPointInView(x, y, child, null)) { 1264 continue; 1265 } 1266 1267 // Obtain a hover target for this child. Dequeue it from the 1268 // old hover target list if the child was previously hovered. 1269 HoverTarget hoverTarget = firstOldHoverTarget; 1270 final boolean wasHovered; 1271 for (HoverTarget predecessor = null; ;) { 1272 if (hoverTarget == null) { 1273 hoverTarget = HoverTarget.obtain(child); 1274 wasHovered = false; 1275 break; 1276 } 1277 1278 if (hoverTarget.child == child) { 1279 if (predecessor != null) { 1280 predecessor.next = hoverTarget.next; 1281 } else { 1282 firstOldHoverTarget = hoverTarget.next; 1283 } 1284 hoverTarget.next = null; 1285 wasHovered = true; 1286 break; 1287 } 1288 1289 predecessor = hoverTarget; 1290 hoverTarget = hoverTarget.next; 1291 } 1292 1293 // Enqueue the hover target onto the new hover target list. 1294 if (lastHoverTarget != null) { 1295 lastHoverTarget.next = hoverTarget; 1296 } else { 1297 lastHoverTarget = hoverTarget; 1298 mFirstHoverTarget = hoverTarget; 1299 } 1300 1301 // Dispatch the event to the child. 1302 if (action == MotionEvent.ACTION_HOVER_ENTER) { 1303 if (!wasHovered) { 1304 // Send the enter as is. 1305 handled |= dispatchTransformedGenericPointerEvent( 1306 event, child); // enter 1307 } 1308 } else if (action == MotionEvent.ACTION_HOVER_MOVE) { 1309 if (!wasHovered) { 1310 // Synthesize an enter from a move. 1311 eventNoHistory = obtainMotionEventNoHistoryOrSelf(eventNoHistory); 1312 eventNoHistory.setAction(MotionEvent.ACTION_HOVER_ENTER); 1313 handled |= dispatchTransformedGenericPointerEvent( 1314 eventNoHistory, child); // enter 1315 eventNoHistory.setAction(action); 1316 1317 handled |= dispatchTransformedGenericPointerEvent( 1318 eventNoHistory, child); // move 1319 } else { 1320 // Send the move as is. 1321 handled |= dispatchTransformedGenericPointerEvent(event, child); 1322 } 1323 } 1324 if (handled) { 1325 break; 1326 } 1327 } 1328 } 1329 } 1330 1331 // Send exit events to all previously hovered children that are no longer hovered. 1332 while (firstOldHoverTarget != null) { 1333 final View child = firstOldHoverTarget.child; 1334 1335 // Exit the old hovered child. 1336 if (action == MotionEvent.ACTION_HOVER_EXIT) { 1337 // Send the exit as is. 1338 handled |= dispatchTransformedGenericPointerEvent( 1339 event, child); // exit 1340 } else { 1341 // Synthesize an exit from a move or enter. 1342 // Ignore the result because hover focus has moved to a different view. 1343 if (action == MotionEvent.ACTION_HOVER_MOVE) { 1344 dispatchTransformedGenericPointerEvent( 1345 event, child); // move 1346 } 1347 eventNoHistory = obtainMotionEventNoHistoryOrSelf(eventNoHistory); 1348 eventNoHistory.setAction(MotionEvent.ACTION_HOVER_EXIT); 1349 dispatchTransformedGenericPointerEvent( 1350 eventNoHistory, child); // exit 1351 eventNoHistory.setAction(action); 1352 } 1353 1354 final HoverTarget nextOldHoverTarget = firstOldHoverTarget.next; 1355 firstOldHoverTarget.recycle(); 1356 firstOldHoverTarget = nextOldHoverTarget; 1357 } 1358 1359 // Send events to the view group itself if no children have handled it. 1360 boolean newHoveredSelf = !handled; 1361 if (newHoveredSelf == mHoveredSelf) { 1362 if (newHoveredSelf) { 1363 // Send event to the view group as before. 1364 handled |= super.dispatchHoverEvent(event); 1365 } 1366 } else { 1367 if (mHoveredSelf) { 1368 // Exit the view group. 1369 if (action == MotionEvent.ACTION_HOVER_EXIT) { 1370 // Send the exit as is. 1371 handled |= super.dispatchHoverEvent(event); // exit 1372 } else { 1373 // Synthesize an exit from a move or enter. 1374 // Ignore the result because hover focus is moving to a different view. 1375 if (action == MotionEvent.ACTION_HOVER_MOVE) { 1376 super.dispatchHoverEvent(event); // move 1377 } 1378 eventNoHistory = obtainMotionEventNoHistoryOrSelf(eventNoHistory); 1379 eventNoHistory.setAction(MotionEvent.ACTION_HOVER_EXIT); 1380 super.dispatchHoverEvent(eventNoHistory); // exit 1381 eventNoHistory.setAction(action); 1382 } 1383 mHoveredSelf = false; 1384 } 1385 1386 if (newHoveredSelf) { 1387 // Enter the view group. 1388 if (action == MotionEvent.ACTION_HOVER_ENTER) { 1389 // Send the enter as is. 1390 handled |= super.dispatchHoverEvent(event); // enter 1391 mHoveredSelf = true; 1392 } else if (action == MotionEvent.ACTION_HOVER_MOVE) { 1393 // Synthesize an enter from a move. 1394 eventNoHistory = obtainMotionEventNoHistoryOrSelf(eventNoHistory); 1395 eventNoHistory.setAction(MotionEvent.ACTION_HOVER_ENTER); 1396 handled |= super.dispatchHoverEvent(eventNoHistory); // enter 1397 eventNoHistory.setAction(action); 1398 1399 handled |= super.dispatchHoverEvent(eventNoHistory); // move 1400 mHoveredSelf = true; 1401 } 1402 } 1403 } 1404 1405 // Recycle the copy of the event that we made. 1406 if (eventNoHistory != event) { 1407 eventNoHistory.recycle(); 1408 } 1409 1410 // Done. 1411 return handled; 1412 } 1413 1414 /** @hide */ 1415 @Override 1416 protected boolean hasHoveredChild() { 1417 return mFirstHoverTarget != null; 1418 } 1419 1420 /** 1421 * Implement this method to intercept hover events before they are handled 1422 * by child views. 1423 * <p> 1424 * This method is called before dispatching a hover event to a child of 1425 * the view group or to the view group's own {@link #onHoverEvent} to allow 1426 * the view group a chance to intercept the hover event. 1427 * This method can also be used to watch all pointer motions that occur within 1428 * the bounds of the view group even when the pointer is hovering over 1429 * a child of the view group rather than over the view group itself. 1430 * </p><p> 1431 * The view group can prevent its children from receiving hover events by 1432 * implementing this method and returning <code>true</code> to indicate 1433 * that it would like to intercept hover events. The view group must 1434 * continuously return <code>true</code> from {@link #onInterceptHoverEvent} 1435 * for as long as it wishes to continue intercepting hover events from 1436 * its children. 1437 * </p><p> 1438 * Interception preserves the invariant that at most one view can be 1439 * hovered at a time by transferring hover focus from the currently hovered 1440 * child to the view group or vice-versa as needed. 1441 * </p><p> 1442 * If this method returns <code>true</code> and a child is already hovered, then the 1443 * child view will first receive a hover exit event and then the view group 1444 * itself will receive a hover enter event in {@link #onHoverEvent}. 1445 * Likewise, if this method had previously returned <code>true</code> to intercept hover 1446 * events and instead returns <code>false</code> while the pointer is hovering 1447 * within the bounds of one of a child, then the view group will first receive a 1448 * hover exit event in {@link #onHoverEvent} and then the hovered child will 1449 * receive a hover enter event. 1450 * </p><p> 1451 * The default implementation always returns false. 1452 * </p> 1453 * 1454 * @param event The motion event that describes the hover. 1455 * @return True if the view group would like to intercept the hover event 1456 * and prevent its children from receiving it. 1457 */ 1458 public boolean onInterceptHoverEvent(MotionEvent event) { 1459 return false; 1460 } 1461 1462 private static MotionEvent obtainMotionEventNoHistoryOrSelf(MotionEvent event) { 1463 if (event.getHistorySize() == 0) { 1464 return event; 1465 } 1466 return MotionEvent.obtainNoHistory(event); 1467 } 1468 1469 /** 1470 * {@inheritDoc} 1471 */ 1472 @Override 1473 protected boolean dispatchGenericPointerEvent(MotionEvent event) { 1474 // Send the event to the child under the pointer. 1475 final int childrenCount = mChildrenCount; 1476 if (childrenCount != 0) { 1477 final View[] children = mChildren; 1478 final float x = event.getX(); 1479 final float y = event.getY(); 1480 1481 for (int i = childrenCount - 1; i >= 0; i--) { 1482 final View child = children[i]; 1483 if (!canViewReceivePointerEvents(child) 1484 || !isTransformedTouchPointInView(x, y, child, null)) { 1485 continue; 1486 } 1487 1488 if (dispatchTransformedGenericPointerEvent(event, child)) { 1489 return true; 1490 } 1491 } 1492 } 1493 1494 // No child handled the event. Send it to this view group. 1495 return super.dispatchGenericPointerEvent(event); 1496 } 1497 1498 /** 1499 * {@inheritDoc} 1500 */ 1501 @Override 1502 protected boolean dispatchGenericFocusedEvent(MotionEvent event) { 1503 // Send the event to the focused child or to this view group if it has focus. 1504 if ((mPrivateFlags & (FOCUSED | HAS_BOUNDS)) == (FOCUSED | HAS_BOUNDS)) { 1505 return super.dispatchGenericFocusedEvent(event); 1506 } else if (mFocused != null && (mFocused.mPrivateFlags & HAS_BOUNDS) == HAS_BOUNDS) { 1507 return mFocused.dispatchGenericMotionEvent(event); 1508 } 1509 return false; 1510 } 1511 1512 /** 1513 * Dispatches a generic pointer event to a child, taking into account 1514 * transformations that apply to the child. 1515 * 1516 * @param event The event to send. 1517 * @param child The view to send the event to. 1518 * @return {@code true} if the child handled the event. 1519 */ 1520 private boolean dispatchTransformedGenericPointerEvent(MotionEvent event, View child) { 1521 final float offsetX = mScrollX - child.mLeft; 1522 final float offsetY = mScrollY - child.mTop; 1523 1524 boolean handled; 1525 if (!child.hasIdentityMatrix()) { 1526 MotionEvent transformedEvent = MotionEvent.obtain(event); 1527 transformedEvent.offsetLocation(offsetX, offsetY); 1528 transformedEvent.transform(child.getInverseMatrix()); 1529 handled = child.dispatchGenericMotionEvent(transformedEvent); 1530 transformedEvent.recycle(); 1531 } else { 1532 event.offsetLocation(offsetX, offsetY); 1533 handled = child.dispatchGenericMotionEvent(event); 1534 event.offsetLocation(-offsetX, -offsetY); 1535 } 1536 return handled; 1537 } 1538 1539 /** 1540 * {@inheritDoc} 1541 */ 1542 @Override 1543 public boolean dispatchTouchEvent(MotionEvent ev) { 1544 if (mInputEventConsistencyVerifier != null) { 1545 mInputEventConsistencyVerifier.onTouchEvent(ev, 1); 1546 } 1547 1548 boolean handled = false; 1549 if (onFilterTouchEventForSecurity(ev)) { 1550 final int action = ev.getAction(); 1551 final int actionMasked = action & MotionEvent.ACTION_MASK; 1552 1553 // Handle an initial down. 1554 if (actionMasked == MotionEvent.ACTION_DOWN) { 1555 // Throw away all previous state when starting a new touch gesture. 1556 // The framework may have dropped the up or cancel event for the previous gesture 1557 // due to an app switch, ANR, or some other state change. 1558 cancelAndClearTouchTargets(ev); 1559 resetTouchState(); 1560 } 1561 1562 // Check for interception. 1563 final boolean intercepted; 1564 if (actionMasked == MotionEvent.ACTION_DOWN 1565 || mFirstTouchTarget != null) { 1566 final boolean disallowIntercept = (mGroupFlags & FLAG_DISALLOW_INTERCEPT) != 0; 1567 if (!disallowIntercept) { 1568 intercepted = onInterceptTouchEvent(ev); 1569 ev.setAction(action); // restore action in case it was changed 1570 } else { 1571 intercepted = false; 1572 } 1573 } else { 1574 // There are no touch targets and this action is not an initial down 1575 // so this view group continues to intercept touches. 1576 intercepted = true; 1577 } 1578 1579 // Check for cancelation. 1580 final boolean canceled = resetCancelNextUpFlag(this) 1581 || actionMasked == MotionEvent.ACTION_CANCEL; 1582 1583 // Update list of touch targets for pointer down, if needed. 1584 final boolean split = (mGroupFlags & FLAG_SPLIT_MOTION_EVENTS) != 0; 1585 TouchTarget newTouchTarget = null; 1586 boolean alreadyDispatchedToNewTouchTarget = false; 1587 if (!canceled && !intercepted) { 1588 if (actionMasked == MotionEvent.ACTION_DOWN 1589 || (split && actionMasked == MotionEvent.ACTION_POINTER_DOWN) 1590 || actionMasked == MotionEvent.ACTION_HOVER_MOVE) { 1591 final int actionIndex = ev.getActionIndex(); // always 0 for down 1592 final int idBitsToAssign = split ? 1 << ev.getPointerId(actionIndex) 1593 : TouchTarget.ALL_POINTER_IDS; 1594 1595 // Clean up earlier touch targets for this pointer id in case they 1596 // have become out of sync. 1597 removePointersFromTouchTargets(idBitsToAssign); 1598 1599 final int childrenCount = mChildrenCount; 1600 if (childrenCount != 0) { 1601 // Find a child that can receive the event. 1602 // Scan children from front to back. 1603 final View[] children = mChildren; 1604 final float x = ev.getX(actionIndex); 1605 final float y = ev.getY(actionIndex); 1606 1607 for (int i = childrenCount - 1; i >= 0; i--) { 1608 final View child = children[i]; 1609 if (!canViewReceivePointerEvents(child) 1610 || !isTransformedTouchPointInView(x, y, child, null)) { 1611 continue; 1612 } 1613 1614 newTouchTarget = getTouchTarget(child); 1615 if (newTouchTarget != null) { 1616 // Child is already receiving touch within its bounds. 1617 // Give it the new pointer in addition to the ones it is handling. 1618 newTouchTarget.pointerIdBits |= idBitsToAssign; 1619 break; 1620 } 1621 1622 resetCancelNextUpFlag(child); 1623 if (dispatchTransformedTouchEvent(ev, false, child, idBitsToAssign)) { 1624 // Child wants to receive touch within its bounds. 1625 mLastTouchDownTime = ev.getDownTime(); 1626 mLastTouchDownIndex = i; 1627 mLastTouchDownX = ev.getX(); 1628 mLastTouchDownY = ev.getY(); 1629 newTouchTarget = addTouchTarget(child, idBitsToAssign); 1630 alreadyDispatchedToNewTouchTarget = true; 1631 break; 1632 } 1633 } 1634 } 1635 1636 if (newTouchTarget == null && mFirstTouchTarget != null) { 1637 // Did not find a child to receive the event. 1638 // Assign the pointer to the least recently added target. 1639 newTouchTarget = mFirstTouchTarget; 1640 while (newTouchTarget.next != null) { 1641 newTouchTarget = newTouchTarget.next; 1642 } 1643 newTouchTarget.pointerIdBits |= idBitsToAssign; 1644 } 1645 } 1646 } 1647 1648 // Dispatch to touch targets. 1649 if (mFirstTouchTarget == null) { 1650 // No touch targets so treat this as an ordinary view. 1651 handled = dispatchTransformedTouchEvent(ev, canceled, null, 1652 TouchTarget.ALL_POINTER_IDS); 1653 } else { 1654 // Dispatch to touch targets, excluding the new touch target if we already 1655 // dispatched to it. Cancel touch targets if necessary. 1656 TouchTarget predecessor = null; 1657 TouchTarget target = mFirstTouchTarget; 1658 while (target != null) { 1659 final TouchTarget next = target.next; 1660 if (alreadyDispatchedToNewTouchTarget && target == newTouchTarget) { 1661 handled = true; 1662 } else { 1663 final boolean cancelChild = resetCancelNextUpFlag(target.child) 1664 || intercepted; 1665 if (dispatchTransformedTouchEvent(ev, cancelChild, 1666 target.child, target.pointerIdBits)) { 1667 handled = true; 1668 } 1669 if (cancelChild) { 1670 if (predecessor == null) { 1671 mFirstTouchTarget = next; 1672 } else { 1673 predecessor.next = next; 1674 } 1675 target.recycle(); 1676 target = next; 1677 continue; 1678 } 1679 } 1680 predecessor = target; 1681 target = next; 1682 } 1683 } 1684 1685 // Update list of touch targets for pointer up or cancel, if needed. 1686 if (canceled 1687 || actionMasked == MotionEvent.ACTION_UP 1688 || actionMasked == MotionEvent.ACTION_HOVER_MOVE) { 1689 resetTouchState(); 1690 } else if (split && actionMasked == MotionEvent.ACTION_POINTER_UP) { 1691 final int actionIndex = ev.getActionIndex(); 1692 final int idBitsToRemove = 1 << ev.getPointerId(actionIndex); 1693 removePointersFromTouchTargets(idBitsToRemove); 1694 } 1695 } 1696 1697 if (!handled && mInputEventConsistencyVerifier != null) { 1698 mInputEventConsistencyVerifier.onUnhandledEvent(ev, 1); 1699 } 1700 return handled; 1701 } 1702 1703 /** 1704 * Resets all touch state in preparation for a new cycle. 1705 */ 1706 private void resetTouchState() { 1707 clearTouchTargets(); 1708 resetCancelNextUpFlag(this); 1709 mGroupFlags &= ~FLAG_DISALLOW_INTERCEPT; 1710 } 1711 1712 /** 1713 * Resets the cancel next up flag. 1714 * Returns true if the flag was previously set. 1715 */ 1716 private boolean resetCancelNextUpFlag(View view) { 1717 if ((view.mPrivateFlags & CANCEL_NEXT_UP_EVENT) != 0) { 1718 view.mPrivateFlags &= ~CANCEL_NEXT_UP_EVENT; 1719 return true; 1720 } 1721 return false; 1722 } 1723 1724 /** 1725 * Clears all touch targets. 1726 */ 1727 private void clearTouchTargets() { 1728 TouchTarget target = mFirstTouchTarget; 1729 if (target != null) { 1730 do { 1731 TouchTarget next = target.next; 1732 target.recycle(); 1733 target = next; 1734 } while (target != null); 1735 mFirstTouchTarget = null; 1736 } 1737 } 1738 1739 /** 1740 * Cancels and clears all touch targets. 1741 */ 1742 private void cancelAndClearTouchTargets(MotionEvent event) { 1743 if (mFirstTouchTarget != null) { 1744 boolean syntheticEvent = false; 1745 if (event == null) { 1746 final long now = SystemClock.uptimeMillis(); 1747 event = MotionEvent.obtain(now, now, 1748 MotionEvent.ACTION_CANCEL, 0.0f, 0.0f, 0); 1749 event.setSource(InputDevice.SOURCE_TOUCHSCREEN); 1750 syntheticEvent = true; 1751 } 1752 1753 for (TouchTarget target = mFirstTouchTarget; target != null; target = target.next) { 1754 resetCancelNextUpFlag(target.child); 1755 dispatchTransformedTouchEvent(event, true, target.child, target.pointerIdBits); 1756 } 1757 clearTouchTargets(); 1758 1759 if (syntheticEvent) { 1760 event.recycle(); 1761 } 1762 } 1763 } 1764 1765 /** 1766 * Gets the touch target for specified child view. 1767 * Returns null if not found. 1768 */ 1769 private TouchTarget getTouchTarget(View child) { 1770 for (TouchTarget target = mFirstTouchTarget; target != null; target = target.next) { 1771 if (target.child == child) { 1772 return target; 1773 } 1774 } 1775 return null; 1776 } 1777 1778 /** 1779 * Adds a touch target for specified child to the beginning of the list. 1780 * Assumes the target child is not already present. 1781 */ 1782 private TouchTarget addTouchTarget(View child, int pointerIdBits) { 1783 TouchTarget target = TouchTarget.obtain(child, pointerIdBits); 1784 target.next = mFirstTouchTarget; 1785 mFirstTouchTarget = target; 1786 return target; 1787 } 1788 1789 /** 1790 * Removes the pointer ids from consideration. 1791 */ 1792 private void removePointersFromTouchTargets(int pointerIdBits) { 1793 TouchTarget predecessor = null; 1794 TouchTarget target = mFirstTouchTarget; 1795 while (target != null) { 1796 final TouchTarget next = target.next; 1797 if ((target.pointerIdBits & pointerIdBits) != 0) { 1798 target.pointerIdBits &= ~pointerIdBits; 1799 if (target.pointerIdBits == 0) { 1800 if (predecessor == null) { 1801 mFirstTouchTarget = next; 1802 } else { 1803 predecessor.next = next; 1804 } 1805 target.recycle(); 1806 target = next; 1807 continue; 1808 } 1809 } 1810 predecessor = target; 1811 target = next; 1812 } 1813 } 1814 1815 /** 1816 * Returns true if a child view can receive pointer events. 1817 * @hide 1818 */ 1819 private static boolean canViewReceivePointerEvents(View child) { 1820 return (child.mViewFlags & VISIBILITY_MASK) == VISIBLE 1821 || child.getAnimation() != null; 1822 } 1823 1824 /** 1825 * Returns true if a child view contains the specified point when transformed 1826 * into its coordinate space. 1827 * Child must not be null. 1828 * @hide 1829 */ 1830 protected boolean isTransformedTouchPointInView(float x, float y, View child, 1831 PointF outLocalPoint) { 1832 float localX = x + mScrollX - child.mLeft; 1833 float localY = y + mScrollY - child.mTop; 1834 if (! child.hasIdentityMatrix() && mAttachInfo != null) { 1835 final float[] localXY = mAttachInfo.mTmpTransformLocation; 1836 localXY[0] = localX; 1837 localXY[1] = localY; 1838 child.getInverseMatrix().mapPoints(localXY); 1839 localX = localXY[0]; 1840 localY = localXY[1]; 1841 } 1842 final boolean isInView = child.pointInView(localX, localY); 1843 if (isInView && outLocalPoint != null) { 1844 outLocalPoint.set(localX, localY); 1845 } 1846 return isInView; 1847 } 1848 1849 /** 1850 * Transforms a motion event into the coordinate space of a particular child view, 1851 * filters out irrelevant pointer ids, and overrides its action if necessary. 1852 * If child is null, assumes the MotionEvent will be sent to this ViewGroup instead. 1853 */ 1854 private boolean dispatchTransformedTouchEvent(MotionEvent event, boolean cancel, 1855 View child, int desiredPointerIdBits) { 1856 final boolean handled; 1857 1858 // Canceling motions is a special case. We don't need to perform any transformations 1859 // or filtering. The important part is the action, not the contents. 1860 final int oldAction = event.getAction(); 1861 if (cancel || oldAction == MotionEvent.ACTION_CANCEL) { 1862 event.setAction(MotionEvent.ACTION_CANCEL); 1863 if (child == null) { 1864 handled = super.dispatchTouchEvent(event); 1865 } else { 1866 handled = child.dispatchTouchEvent(event); 1867 } 1868 event.setAction(oldAction); 1869 return handled; 1870 } 1871 1872 // Calculate the number of pointers to deliver. 1873 final int oldPointerIdBits = event.getPointerIdBits(); 1874 final int newPointerIdBits = oldPointerIdBits & desiredPointerIdBits; 1875 1876 // If for some reason we ended up in an inconsistent state where it looks like we 1877 // might produce a motion event with no pointers in it, then drop the event. 1878 if (newPointerIdBits == 0) { 1879 return false; 1880 } 1881 1882 // If the number of pointers is the same and we don't need to perform any fancy 1883 // irreversible transformations, then we can reuse the motion event for this 1884 // dispatch as long as we are careful to revert any changes we make. 1885 // Otherwise we need to make a copy. 1886 final MotionEvent transformedEvent; 1887 if (newPointerIdBits == oldPointerIdBits) { 1888 if (child == null || child.hasIdentityMatrix()) { 1889 if (child == null) { 1890 handled = super.dispatchTouchEvent(event); 1891 } else { 1892 final float offsetX = mScrollX - child.mLeft; 1893 final float offsetY = mScrollY - child.mTop; 1894 event.offsetLocation(offsetX, offsetY); 1895 1896 handled = child.dispatchTouchEvent(event); 1897 1898 event.offsetLocation(-offsetX, -offsetY); 1899 } 1900 return handled; 1901 } 1902 transformedEvent = MotionEvent.obtain(event); 1903 } else { 1904 transformedEvent = event.split(newPointerIdBits); 1905 } 1906 1907 // Perform any necessary transformations and dispatch. 1908 if (child == null) { 1909 handled = super.dispatchTouchEvent(transformedEvent); 1910 } else { 1911 final float offsetX = mScrollX - child.mLeft; 1912 final float offsetY = mScrollY - child.mTop; 1913 transformedEvent.offsetLocation(offsetX, offsetY); 1914 if (! child.hasIdentityMatrix()) { 1915 transformedEvent.transform(child.getInverseMatrix()); 1916 } 1917 1918 handled = child.dispatchTouchEvent(transformedEvent); 1919 } 1920 1921 // Done. 1922 transformedEvent.recycle(); 1923 return handled; 1924 } 1925 1926 /** 1927 * Enable or disable the splitting of MotionEvents to multiple children during touch event 1928 * dispatch. This behavior is enabled by default for applications that target an 1929 * SDK version of {@link Build.VERSION_CODES#HONEYCOMB} or newer. 1930 * 1931 * <p>When this option is enabled MotionEvents may be split and dispatched to different child 1932 * views depending on where each pointer initially went down. This allows for user interactions 1933 * such as scrolling two panes of content independently, chording of buttons, and performing 1934 * independent gestures on different pieces of content. 1935 * 1936 * @param split <code>true</code> to allow MotionEvents to be split and dispatched to multiple 1937 * child views. <code>false</code> to only allow one child view to be the target of 1938 * any MotionEvent received by this ViewGroup. 1939 */ 1940 public void setMotionEventSplittingEnabled(boolean split) { 1941 // TODO Applications really shouldn't change this setting mid-touch event, 1942 // but perhaps this should handle that case and send ACTION_CANCELs to any child views 1943 // with gestures in progress when this is changed. 1944 if (split) { 1945 mGroupFlags |= FLAG_SPLIT_MOTION_EVENTS; 1946 } else { 1947 mGroupFlags &= ~FLAG_SPLIT_MOTION_EVENTS; 1948 } 1949 } 1950 1951 /** 1952 * Returns true if MotionEvents dispatched to this ViewGroup can be split to multiple children. 1953 * @return true if MotionEvents dispatched to this ViewGroup can be split to multiple children. 1954 */ 1955 public boolean isMotionEventSplittingEnabled() { 1956 return (mGroupFlags & FLAG_SPLIT_MOTION_EVENTS) == FLAG_SPLIT_MOTION_EVENTS; 1957 } 1958 1959 /** 1960 * {@inheritDoc} 1961 */ 1962 public void requestDisallowInterceptTouchEvent(boolean disallowIntercept) { 1963 1964 if (disallowIntercept == ((mGroupFlags & FLAG_DISALLOW_INTERCEPT) != 0)) { 1965 // We're already in this state, assume our ancestors are too 1966 return; 1967 } 1968 1969 if (disallowIntercept) { 1970 mGroupFlags |= FLAG_DISALLOW_INTERCEPT; 1971 } else { 1972 mGroupFlags &= ~FLAG_DISALLOW_INTERCEPT; 1973 } 1974 1975 // Pass it up to our parent 1976 if (mParent != null) { 1977 mParent.requestDisallowInterceptTouchEvent(disallowIntercept); 1978 } 1979 } 1980 1981 /** 1982 * Implement this method to intercept all touch screen motion events. This 1983 * allows you to watch events as they are dispatched to your children, and 1984 * take ownership of the current gesture at any point. 1985 * 1986 * <p>Using this function takes some care, as it has a fairly complicated 1987 * interaction with {@link View#onTouchEvent(MotionEvent) 1988 * View.onTouchEvent(MotionEvent)}, and using it requires implementing 1989 * that method as well as this one in the correct way. Events will be 1990 * received in the following order: 1991 * 1992 * <ol> 1993 * <li> You will receive the down event here. 1994 * <li> The down event will be handled either by a child of this view 1995 * group, or given to your own onTouchEvent() method to handle; this means 1996 * you should implement onTouchEvent() to return true, so you will 1997 * continue to see the rest of the gesture (instead of looking for 1998 * a parent view to handle it). Also, by returning true from 1999 * onTouchEvent(), you will not receive any following 2000 * events in onInterceptTouchEvent() and all touch processing must 2001 * happen in onTouchEvent() like normal. 2002 * <li> For as long as you return false from this function, each following 2003 * event (up to and including the final up) will be delivered first here 2004 * and then to the target's onTouchEvent(). 2005 * <li> If you return true from here, you will not receive any 2006 * following events: the target view will receive the same event but 2007 * with the action {@link MotionEvent#ACTION_CANCEL}, and all further 2008 * events will be delivered to your onTouchEvent() method and no longer 2009 * appear here. 2010 * </ol> 2011 * 2012 * @param ev The motion event being dispatched down the hierarchy. 2013 * @return Return true to steal motion events from the children and have 2014 * them dispatched to this ViewGroup through onTouchEvent(). 2015 * The current target will receive an ACTION_CANCEL event, and no further 2016 * messages will be delivered here. 2017 */ 2018 public boolean onInterceptTouchEvent(MotionEvent ev) { 2019 return false; 2020 } 2021 2022 /** 2023 * {@inheritDoc} 2024 * 2025 * Looks for a view to give focus to respecting the setting specified by 2026 * {@link #getDescendantFocusability()}. 2027 * 2028 * Uses {@link #onRequestFocusInDescendants(int, android.graphics.Rect)} to 2029 * find focus within the children of this group when appropriate. 2030 * 2031 * @see #FOCUS_BEFORE_DESCENDANTS 2032 * @see #FOCUS_AFTER_DESCENDANTS 2033 * @see #FOCUS_BLOCK_DESCENDANTS 2034 * @see #onRequestFocusInDescendants(int, android.graphics.Rect) 2035 */ 2036 @Override 2037 public boolean requestFocus(int direction, Rect previouslyFocusedRect) { 2038 if (DBG) { 2039 System.out.println(this + " ViewGroup.requestFocus direction=" 2040 + direction); 2041 } 2042 int descendantFocusability = getDescendantFocusability(); 2043 2044 switch (descendantFocusability) { 2045 case FOCUS_BLOCK_DESCENDANTS: 2046 return super.requestFocus(direction, previouslyFocusedRect); 2047 case FOCUS_BEFORE_DESCENDANTS: { 2048 final boolean took = super.requestFocus(direction, previouslyFocusedRect); 2049 return took ? took : onRequestFocusInDescendants(direction, previouslyFocusedRect); 2050 } 2051 case FOCUS_AFTER_DESCENDANTS: { 2052 final boolean took = onRequestFocusInDescendants(direction, previouslyFocusedRect); 2053 return took ? took : super.requestFocus(direction, previouslyFocusedRect); 2054 } 2055 default: 2056 throw new IllegalStateException("descendant focusability must be " 2057 + "one of FOCUS_BEFORE_DESCENDANTS, FOCUS_AFTER_DESCENDANTS, FOCUS_BLOCK_DESCENDANTS " 2058 + "but is " + descendantFocusability); 2059 } 2060 } 2061 2062 /** 2063 * Look for a descendant to call {@link View#requestFocus} on. 2064 * Called by {@link ViewGroup#requestFocus(int, android.graphics.Rect)} 2065 * when it wants to request focus within its children. Override this to 2066 * customize how your {@link ViewGroup} requests focus within its children. 2067 * @param direction One of FOCUS_UP, FOCUS_DOWN, FOCUS_LEFT, and FOCUS_RIGHT 2068 * @param previouslyFocusedRect The rectangle (in this View's coordinate system) 2069 * to give a finer grained hint about where focus is coming from. May be null 2070 * if there is no hint. 2071 * @return Whether focus was taken. 2072 */ 2073 @SuppressWarnings({"ConstantConditions"}) 2074 protected boolean onRequestFocusInDescendants(int direction, 2075 Rect previouslyFocusedRect) { 2076 int index; 2077 int increment; 2078 int end; 2079 int count = mChildrenCount; 2080 if ((direction & FOCUS_FORWARD) != 0) { 2081 index = 0; 2082 increment = 1; 2083 end = count; 2084 } else { 2085 index = count - 1; 2086 increment = -1; 2087 end = -1; 2088 } 2089 final View[] children = mChildren; 2090 for (int i = index; i != end; i += increment) { 2091 View child = children[i]; 2092 if ((child.mViewFlags & VISIBILITY_MASK) == VISIBLE) { 2093 if (child.requestFocus(direction, previouslyFocusedRect)) { 2094 return true; 2095 } 2096 } 2097 } 2098 return false; 2099 } 2100 2101 /** 2102 * {@inheritDoc} 2103 * 2104 * @hide 2105 */ 2106 @Override 2107 public void dispatchStartTemporaryDetach() { 2108 super.dispatchStartTemporaryDetach(); 2109 final int count = mChildrenCount; 2110 final View[] children = mChildren; 2111 for (int i = 0; i < count; i++) { 2112 children[i].dispatchStartTemporaryDetach(); 2113 } 2114 } 2115 2116 /** 2117 * {@inheritDoc} 2118 * 2119 * @hide 2120 */ 2121 @Override 2122 public void dispatchFinishTemporaryDetach() { 2123 super.dispatchFinishTemporaryDetach(); 2124 final int count = mChildrenCount; 2125 final View[] children = mChildren; 2126 for (int i = 0; i < count; i++) { 2127 children[i].dispatchFinishTemporaryDetach(); 2128 } 2129 } 2130 2131 /** 2132 * {@inheritDoc} 2133 */ 2134 @Override 2135 void dispatchAttachedToWindow(AttachInfo info, int visibility) { 2136 super.dispatchAttachedToWindow(info, visibility); 2137 visibility |= mViewFlags & VISIBILITY_MASK; 2138 final int count = mChildrenCount; 2139 final View[] children = mChildren; 2140 for (int i = 0; i < count; i++) { 2141 children[i].dispatchAttachedToWindow(info, visibility); 2142 } 2143 } 2144 2145 @Override 2146 public boolean dispatchPopulateAccessibilityEvent(AccessibilityEvent event) { 2147 // We first get a chance to populate the event. 2148 onPopulateAccessibilityEvent(event); 2149 // Let our children have a shot in populating the event. 2150 for (int i = 0, count = getChildCount(); i < count; i++) { 2151 boolean handled = getChildAt(i).dispatchPopulateAccessibilityEvent(event); 2152 if (handled) { 2153 return handled; 2154 } 2155 } 2156 return false; 2157 } 2158 2159 @Override 2160 public void onInitializeAccessibilityNodeInfo(AccessibilityNodeInfo info) { 2161 super.onInitializeAccessibilityNodeInfo(info); 2162 for (int i = 0, count = mChildrenCount; i < count; i++) { 2163 View child = mChildren[i]; 2164 if ((child.mViewFlags & VISIBILITY_MASK) == VISIBLE) { 2165 info.addChild(child); 2166 } 2167 } 2168 } 2169 2170 /** 2171 * {@inheritDoc} 2172 */ 2173 @Override 2174 void dispatchDetachedFromWindow() { 2175 // If we still have a touch target, we are still in the process of 2176 // dispatching motion events to a child; we need to get rid of that 2177 // child to avoid dispatching events to it after the window is torn 2178 // down. To make sure we keep the child in a consistent state, we 2179 // first send it an ACTION_CANCEL motion event. 2180 cancelAndClearTouchTargets(null); 2181 2182 // In case view is detached while transition is running 2183 mLayoutSuppressed = false; 2184 2185 // Tear down our drag tracking 2186 mDragNotifiedChildren = null; 2187 if (mCurrentDrag != null) { 2188 mCurrentDrag.recycle(); 2189 mCurrentDrag = null; 2190 } 2191 2192 final int count = mChildrenCount; 2193 final View[] children = mChildren; 2194 for (int i = 0; i < count; i++) { 2195 children[i].dispatchDetachedFromWindow(); 2196 } 2197 super.dispatchDetachedFromWindow(); 2198 } 2199 2200 /** 2201 * {@inheritDoc} 2202 */ 2203 @Override 2204 public void setPadding(int left, int top, int right, int bottom) { 2205 super.setPadding(left, top, right, bottom); 2206 2207 if ((mPaddingLeft | mPaddingTop | mPaddingRight | mPaddingBottom) != 0) { 2208 mGroupFlags |= FLAG_PADDING_NOT_NULL; 2209 } else { 2210 mGroupFlags &= ~FLAG_PADDING_NOT_NULL; 2211 } 2212 } 2213 2214 /** 2215 * {@inheritDoc} 2216 */ 2217 @Override 2218 protected void dispatchSaveInstanceState(SparseArray<Parcelable> container) { 2219 super.dispatchSaveInstanceState(container); 2220 final int count = mChildrenCount; 2221 final View[] children = mChildren; 2222 for (int i = 0; i < count; i++) { 2223 View c = children[i]; 2224 if ((c.mViewFlags & PARENT_SAVE_DISABLED_MASK) != PARENT_SAVE_DISABLED) { 2225 c.dispatchSaveInstanceState(container); 2226 } 2227 } 2228 } 2229 2230 /** 2231 * Perform dispatching of a {@link #saveHierarchyState(android.util.SparseArray)} freeze()} 2232 * to only this view, not to its children. For use when overriding 2233 * {@link #dispatchSaveInstanceState(android.util.SparseArray)} dispatchFreeze()} to allow 2234 * subclasses to freeze their own state but not the state of their children. 2235 * 2236 * @param container the container 2237 */ 2238 protected void dispatchFreezeSelfOnly(SparseArray<Parcelable> container) { 2239 super.dispatchSaveInstanceState(container); 2240 } 2241 2242 /** 2243 * {@inheritDoc} 2244 */ 2245 @Override 2246 protected void dispatchRestoreInstanceState(SparseArray<Parcelable> container) { 2247 super.dispatchRestoreInstanceState(container); 2248 final int count = mChildrenCount; 2249 final View[] children = mChildren; 2250 for (int i = 0; i < count; i++) { 2251 View c = children[i]; 2252 if ((c.mViewFlags & PARENT_SAVE_DISABLED_MASK) != PARENT_SAVE_DISABLED) { 2253 c.dispatchRestoreInstanceState(container); 2254 } 2255 } 2256 } 2257 2258 /** 2259 * Perform dispatching of a {@link #restoreHierarchyState(android.util.SparseArray)} 2260 * to only this view, not to its children. For use when overriding 2261 * {@link #dispatchRestoreInstanceState(android.util.SparseArray)} to allow 2262 * subclasses to thaw their own state but not the state of their children. 2263 * 2264 * @param container the container 2265 */ 2266 protected void dispatchThawSelfOnly(SparseArray<Parcelable> container) { 2267 super.dispatchRestoreInstanceState(container); 2268 } 2269 2270 /** 2271 * Enables or disables the drawing cache for each child of this view group. 2272 * 2273 * @param enabled true to enable the cache, false to dispose of it 2274 */ 2275 protected void setChildrenDrawingCacheEnabled(boolean enabled) { 2276 if (enabled || (mPersistentDrawingCache & PERSISTENT_ALL_CACHES) != PERSISTENT_ALL_CACHES) { 2277 final View[] children = mChildren; 2278 final int count = mChildrenCount; 2279 for (int i = 0; i < count; i++) { 2280 children[i].setDrawingCacheEnabled(enabled); 2281 } 2282 } 2283 } 2284 2285 @Override 2286 protected void onAnimationStart() { 2287 super.onAnimationStart(); 2288 2289 // When this ViewGroup's animation starts, build the cache for the children 2290 if ((mGroupFlags & FLAG_ANIMATION_CACHE) == FLAG_ANIMATION_CACHE) { 2291 final int count = mChildrenCount; 2292 final View[] children = mChildren; 2293 final boolean buildCache = !isHardwareAccelerated(); 2294 2295 for (int i = 0; i < count; i++) { 2296 final View child = children[i]; 2297 if ((child.mViewFlags & VISIBILITY_MASK) == VISIBLE) { 2298 child.setDrawingCacheEnabled(true); 2299 if (buildCache) { 2300 child.buildDrawingCache(true); 2301 } 2302 } 2303 } 2304 2305 mGroupFlags |= FLAG_CHILDREN_DRAWN_WITH_CACHE; 2306 } 2307 } 2308 2309 @Override 2310 protected void onAnimationEnd() { 2311 super.onAnimationEnd(); 2312 2313 // When this ViewGroup's animation ends, destroy the cache of the children 2314 if ((mGroupFlags & FLAG_ANIMATION_CACHE) == FLAG_ANIMATION_CACHE) { 2315 mGroupFlags &= ~FLAG_CHILDREN_DRAWN_WITH_CACHE; 2316 2317 if ((mPersistentDrawingCache & PERSISTENT_ANIMATION_CACHE) == 0) { 2318 setChildrenDrawingCacheEnabled(false); 2319 } 2320 } 2321 } 2322 2323 @Override 2324 Bitmap createSnapshot(Bitmap.Config quality, int backgroundColor, boolean skipChildren) { 2325 int count = mChildrenCount; 2326 int[] visibilities = null; 2327 2328 if (skipChildren) { 2329 visibilities = new int[count]; 2330 for (int i = 0; i < count; i++) { 2331 View child = getChildAt(i); 2332 visibilities[i] = child.getVisibility(); 2333 if (visibilities[i] == View.VISIBLE) { 2334 child.setVisibility(INVISIBLE); 2335 } 2336 } 2337 } 2338 2339 Bitmap b = super.createSnapshot(quality, backgroundColor, skipChildren); 2340 2341 if (skipChildren) { 2342 for (int i = 0; i < count; i++) { 2343 getChildAt(i).setVisibility(visibilities[i]); 2344 } 2345 } 2346 2347 return b; 2348 } 2349 2350 /** 2351 * {@inheritDoc} 2352 */ 2353 @Override 2354 protected void dispatchDraw(Canvas canvas) { 2355 final int count = mChildrenCount; 2356 final View[] children = mChildren; 2357 int flags = mGroupFlags; 2358 2359 if ((flags & FLAG_RUN_ANIMATION) != 0 && canAnimate()) { 2360 final boolean cache = (mGroupFlags & FLAG_ANIMATION_CACHE) == FLAG_ANIMATION_CACHE; 2361 2362 final boolean buildCache = !isHardwareAccelerated(); 2363 for (int i = 0; i < count; i++) { 2364 final View child = children[i]; 2365 if ((child.mViewFlags & VISIBILITY_MASK) == VISIBLE) { 2366 final LayoutParams params = child.getLayoutParams(); 2367 attachLayoutAnimationParameters(child, params, i, count); 2368 bindLayoutAnimation(child); 2369 if (cache) { 2370 child.setDrawingCacheEnabled(true); 2371 if (buildCache) { 2372 child.buildDrawingCache(true); 2373 } 2374 } 2375 } 2376 } 2377 2378 final LayoutAnimationController controller = mLayoutAnimationController; 2379 if (controller.willOverlap()) { 2380 mGroupFlags |= FLAG_OPTIMIZE_INVALIDATE; 2381 } 2382 2383 controller.start(); 2384 2385 mGroupFlags &= ~FLAG_RUN_ANIMATION; 2386 mGroupFlags &= ~FLAG_ANIMATION_DONE; 2387 2388 if (cache) { 2389 mGroupFlags |= FLAG_CHILDREN_DRAWN_WITH_CACHE; 2390 } 2391 2392 if (mAnimationListener != null) { 2393 mAnimationListener.onAnimationStart(controller.getAnimation()); 2394 } 2395 } 2396 2397 int saveCount = 0; 2398 final boolean clipToPadding = (flags & CLIP_TO_PADDING_MASK) == CLIP_TO_PADDING_MASK; 2399 if (clipToPadding) { 2400 saveCount = canvas.save(); 2401 canvas.clipRect(mScrollX + mPaddingLeft, mScrollY + mPaddingTop, 2402 mScrollX + mRight - mLeft - mPaddingRight, 2403 mScrollY + mBottom - mTop - mPaddingBottom); 2404 2405 } 2406 2407 // We will draw our child's animation, let's reset the flag 2408 mPrivateFlags &= ~DRAW_ANIMATION; 2409 mGroupFlags &= ~FLAG_INVALIDATE_REQUIRED; 2410 2411 boolean more = false; 2412 final long drawingTime = getDrawingTime(); 2413 2414 if ((flags & FLAG_USE_CHILD_DRAWING_ORDER) == 0) { 2415 for (int i = 0; i < count; i++) { 2416 final View child = children[i]; 2417 if ((child.mViewFlags & VISIBILITY_MASK) == VISIBLE || child.getAnimation() != null) { 2418 more |= drawChild(canvas, child, drawingTime); 2419 } 2420 } 2421 } else { 2422 for (int i = 0; i < count; i++) { 2423 final View child = children[getChildDrawingOrder(count, i)]; 2424 if ((child.mViewFlags & VISIBILITY_MASK) == VISIBLE || child.getAnimation() != null) { 2425 more |= drawChild(canvas, child, drawingTime); 2426 } 2427 } 2428 } 2429 2430 // Draw any disappearing views that have animations 2431 if (mDisappearingChildren != null) { 2432 final ArrayList<View> disappearingChildren = mDisappearingChildren; 2433 final int disappearingCount = disappearingChildren.size() - 1; 2434 // Go backwards -- we may delete as animations finish 2435 for (int i = disappearingCount; i >= 0; i--) { 2436 final View child = disappearingChildren.get(i); 2437 more |= drawChild(canvas, child, drawingTime); 2438 } 2439 } 2440 2441 if (clipToPadding) { 2442 canvas.restoreToCount(saveCount); 2443 } 2444 2445 // mGroupFlags might have been updated by drawChild() 2446 flags = mGroupFlags; 2447 2448 if ((flags & FLAG_INVALIDATE_REQUIRED) == FLAG_INVALIDATE_REQUIRED) { 2449 invalidate(true); 2450 } 2451 2452 if ((flags & FLAG_ANIMATION_DONE) == 0 && (flags & FLAG_NOTIFY_ANIMATION_LISTENER) == 0 && 2453 mLayoutAnimationController.isDone() && !more) { 2454 // We want to erase the drawing cache and notify the listener after the 2455 // next frame is drawn because one extra invalidate() is caused by 2456 // drawChild() after the animation is over 2457 mGroupFlags |= FLAG_NOTIFY_ANIMATION_LISTENER; 2458 final Runnable end = new Runnable() { 2459 public void run() { 2460 notifyAnimationListener(); 2461 } 2462 }; 2463 post(end); 2464 } 2465 } 2466 2467 /** 2468 * Returns the index of the child to draw for this iteration. Override this 2469 * if you want to change the drawing order of children. By default, it 2470 * returns i. 2471 * <p> 2472 * NOTE: In order for this method to be called, you must enable child ordering 2473 * first by calling {@link #setChildrenDrawingOrderEnabled(boolean)}. 2474 * 2475 * @param i The current iteration. 2476 * @return The index of the child to draw this iteration. 2477 * 2478 * @see #setChildrenDrawingOrderEnabled(boolean) 2479 * @see #isChildrenDrawingOrderEnabled() 2480 */ 2481 protected int getChildDrawingOrder(int childCount, int i) { 2482 return i; 2483 } 2484 2485 private void notifyAnimationListener() { 2486 mGroupFlags &= ~FLAG_NOTIFY_ANIMATION_LISTENER; 2487 mGroupFlags |= FLAG_ANIMATION_DONE; 2488 2489 if (mAnimationListener != null) { 2490 final Runnable end = new Runnable() { 2491 public void run() { 2492 mAnimationListener.onAnimationEnd(mLayoutAnimationController.getAnimation()); 2493 } 2494 }; 2495 post(end); 2496 } 2497 2498 if ((mGroupFlags & FLAG_ANIMATION_CACHE) == FLAG_ANIMATION_CACHE) { 2499 mGroupFlags &= ~FLAG_CHILDREN_DRAWN_WITH_CACHE; 2500 if ((mPersistentDrawingCache & PERSISTENT_ANIMATION_CACHE) == 0) { 2501 setChildrenDrawingCacheEnabled(false); 2502 } 2503 } 2504 2505 invalidate(true); 2506 } 2507 2508 /** 2509 * This method is used to cause children of this ViewGroup to restore or recreate their 2510 * display lists. It is called by getDisplayList() when the parent ViewGroup does not need 2511 * to recreate its own display list, which would happen if it went through the normal 2512 * draw/dispatchDraw mechanisms. 2513 * 2514 * @hide 2515 */ 2516 @Override 2517 protected void dispatchGetDisplayList() { 2518 final int count = mChildrenCount; 2519 final View[] children = mChildren; 2520 for (int i = 0; i < count; i++) { 2521 final View child = children[i]; 2522 if ((child.mViewFlags & VISIBILITY_MASK) == VISIBLE || child.getAnimation() != null) { 2523 child.mRecreateDisplayList = (child.mPrivateFlags & INVALIDATED) == INVALIDATED; 2524 child.mPrivateFlags &= ~INVALIDATED; 2525 child.getDisplayList(); 2526 child.mRecreateDisplayList = false; 2527 } 2528 } 2529 } 2530 2531 /** 2532 * Draw one child of this View Group. This method is responsible for getting 2533 * the canvas in the right state. This includes clipping, translating so 2534 * that the child's scrolled origin is at 0, 0, and applying any animation 2535 * transformations. 2536 * 2537 * @param canvas The canvas on which to draw the child 2538 * @param child Who to draw 2539 * @param drawingTime The time at which draw is occuring 2540 * @return True if an invalidate() was issued 2541 */ 2542 protected boolean drawChild(Canvas canvas, View child, long drawingTime) { 2543 boolean more = false; 2544 2545 final int cl = child.mLeft; 2546 final int ct = child.mTop; 2547 final int cr = child.mRight; 2548 final int cb = child.mBottom; 2549 2550 final boolean childHasIdentityMatrix = child.hasIdentityMatrix(); 2551 2552 final int flags = mGroupFlags; 2553 2554 if ((flags & FLAG_CLEAR_TRANSFORMATION) == FLAG_CLEAR_TRANSFORMATION) { 2555 mChildTransformation.clear(); 2556 mGroupFlags &= ~FLAG_CLEAR_TRANSFORMATION; 2557 } 2558 2559 Transformation transformToApply = null; 2560 Transformation invalidationTransform; 2561 final Animation a = child.getAnimation(); 2562 boolean concatMatrix = false; 2563 2564 boolean scalingRequired = false; 2565 boolean caching; 2566 int layerType = mDrawLayers ? child.getLayerType() : LAYER_TYPE_NONE; 2567 2568 final boolean hardwareAccelerated = canvas.isHardwareAccelerated(); 2569 if ((flags & FLAG_CHILDREN_DRAWN_WITH_CACHE) == FLAG_CHILDREN_DRAWN_WITH_CACHE || 2570 (flags & FLAG_ALWAYS_DRAWN_WITH_CACHE) == FLAG_ALWAYS_DRAWN_WITH_CACHE) { 2571 caching = true; 2572 if (mAttachInfo != null) scalingRequired = mAttachInfo.mScalingRequired; 2573 } else { 2574 caching = (layerType != LAYER_TYPE_NONE) || hardwareAccelerated; 2575 } 2576 2577 if (a != null) { 2578 final boolean initialized = a.isInitialized(); 2579 if (!initialized) { 2580 a.initialize(cr - cl, cb - ct, getWidth(), getHeight()); 2581 a.initializeInvalidateRegion(0, 0, cr - cl, cb - ct); 2582 child.onAnimationStart(); 2583 } 2584 2585 more = a.getTransformation(drawingTime, mChildTransformation, 2586 scalingRequired ? mAttachInfo.mApplicationScale : 1f); 2587 if (scalingRequired && mAttachInfo.mApplicationScale != 1f) { 2588 if (mInvalidationTransformation == null) { 2589 mInvalidationTransformation = new Transformation(); 2590 } 2591 invalidationTransform = mInvalidationTransformation; 2592 a.getTransformation(drawingTime, invalidationTransform, 1f); 2593 } else { 2594 invalidationTransform = mChildTransformation; 2595 } 2596 transformToApply = mChildTransformation; 2597 2598 concatMatrix = a.willChangeTransformationMatrix(); 2599 2600 if (more) { 2601 if (!a.willChangeBounds()) { 2602 if ((flags & (FLAG_OPTIMIZE_INVALIDATE | FLAG_ANIMATION_DONE)) == 2603 FLAG_OPTIMIZE_INVALIDATE) { 2604 mGroupFlags |= FLAG_INVALIDATE_REQUIRED; 2605 } else if ((flags & FLAG_INVALIDATE_REQUIRED) == 0) { 2606 // The child need to draw an animation, potentially offscreen, so 2607 // make sure we do not cancel invalidate requests 2608 mPrivateFlags |= DRAW_ANIMATION; 2609 invalidate(cl, ct, cr, cb); 2610 } 2611 } else { 2612 if (mInvalidateRegion == null) { 2613 mInvalidateRegion = new RectF(); 2614 } 2615 final RectF region = mInvalidateRegion; 2616 a.getInvalidateRegion(0, 0, cr - cl, cb - ct, region, invalidationTransform); 2617 2618 // The child need to draw an animation, potentially offscreen, so 2619 // make sure we do not cancel invalidate requests 2620 mPrivateFlags |= DRAW_ANIMATION; 2621 2622 final int left = cl + (int) region.left; 2623 final int top = ct + (int) region.top; 2624 invalidate(left, top, left + (int) region.width(), top + (int) region.height()); 2625 } 2626 } 2627 } else if ((flags & FLAG_SUPPORT_STATIC_TRANSFORMATIONS) == 2628 FLAG_SUPPORT_STATIC_TRANSFORMATIONS) { 2629 final boolean hasTransform = getChildStaticTransformation(child, mChildTransformation); 2630 if (hasTransform) { 2631 final int transformType = mChildTransformation.getTransformationType(); 2632 transformToApply = transformType != Transformation.TYPE_IDENTITY ? 2633 mChildTransformation : null; 2634 concatMatrix = (transformType & Transformation.TYPE_MATRIX) != 0; 2635 } 2636 } 2637 2638 concatMatrix |= !childHasIdentityMatrix; 2639 2640 // Sets the flag as early as possible to allow draw() implementations 2641 // to call invalidate() successfully when doing animations 2642 child.mPrivateFlags |= DRAWN; 2643 2644 if (!concatMatrix && canvas.quickReject(cl, ct, cr, cb, Canvas.EdgeType.BW) && 2645 (child.mPrivateFlags & DRAW_ANIMATION) == 0) { 2646 return more; 2647 } 2648 2649 float alpha = child.getAlpha(); 2650 // Bail out early if the view does not need to be drawn 2651 if (alpha <= ViewConfiguration.ALPHA_THRESHOLD && (child.mPrivateFlags & ALPHA_SET) == 0 && 2652 !(child instanceof SurfaceView)) { 2653 return more; 2654 } 2655 2656 if (hardwareAccelerated) { 2657 // Clear INVALIDATED flag to allow invalidation to occur during rendering, but 2658 // retain the flag's value temporarily in the mRecreateDisplayList flag 2659 child.mRecreateDisplayList = (child.mPrivateFlags & INVALIDATED) == INVALIDATED; 2660 child.mPrivateFlags &= ~INVALIDATED; 2661 } 2662 2663 child.computeScroll(); 2664 2665 final int sx = child.mScrollX; 2666 final int sy = child.mScrollY; 2667 2668 DisplayList displayList = null; 2669 Bitmap cache = null; 2670 boolean hasDisplayList = false; 2671 if (caching) { 2672 if (!hardwareAccelerated) { 2673 if (layerType != LAYER_TYPE_NONE) { 2674 layerType = LAYER_TYPE_SOFTWARE; 2675 child.buildDrawingCache(true); 2676 } 2677 cache = child.getDrawingCache(true); 2678 } else { 2679 switch (layerType) { 2680 case LAYER_TYPE_SOFTWARE: 2681 child.buildDrawingCache(true); 2682 cache = child.getDrawingCache(true); 2683 break; 2684 case LAYER_TYPE_NONE: 2685 // Delay getting the display list until animation-driven alpha values are 2686 // set up and possibly passed on to the view 2687 hasDisplayList = child.canHaveDisplayList(); 2688 break; 2689 } 2690 } 2691 } 2692 2693 final boolean hasNoCache = cache == null || hasDisplayList; 2694 final boolean offsetForScroll = cache == null && !hasDisplayList && 2695 layerType != LAYER_TYPE_HARDWARE; 2696 2697 final int restoreTo = canvas.save(); 2698 if (offsetForScroll) { 2699 canvas.translate(cl - sx, ct - sy); 2700 } else { 2701 canvas.translate(cl, ct); 2702 if (scalingRequired) { 2703 // mAttachInfo cannot be null, otherwise scalingRequired == false 2704 final float scale = 1.0f / mAttachInfo.mApplicationScale; 2705 canvas.scale(scale, scale); 2706 } 2707 } 2708 2709 if (transformToApply != null || alpha < 1.0f || !child.hasIdentityMatrix()) { 2710 if (transformToApply != null || !childHasIdentityMatrix) { 2711 int transX = 0; 2712 int transY = 0; 2713 2714 if (offsetForScroll) { 2715 transX = -sx; 2716 transY = -sy; 2717 } 2718 2719 if (transformToApply != null) { 2720 if (concatMatrix) { 2721 // Undo the scroll translation, apply the transformation matrix, 2722 // then redo the scroll translate to get the correct result. 2723 canvas.translate(-transX, -transY); 2724 canvas.concat(transformToApply.getMatrix()); 2725 canvas.translate(transX, transY); 2726 mGroupFlags |= FLAG_CLEAR_TRANSFORMATION; 2727 } 2728 2729 float transformAlpha = transformToApply.getAlpha(); 2730 if (transformAlpha < 1.0f) { 2731 alpha *= transformToApply.getAlpha(); 2732 mGroupFlags |= FLAG_CLEAR_TRANSFORMATION; 2733 } 2734 } 2735 2736 if (!childHasIdentityMatrix) { 2737 canvas.translate(-transX, -transY); 2738 canvas.concat(child.getMatrix()); 2739 canvas.translate(transX, transY); 2740 } 2741 } 2742 2743 if (alpha < 1.0f) { 2744 mGroupFlags |= FLAG_CLEAR_TRANSFORMATION; 2745 if (hasNoCache) { 2746 final int multipliedAlpha = (int) (255 * alpha); 2747 if (!child.onSetAlpha(multipliedAlpha)) { 2748 int layerFlags = Canvas.HAS_ALPHA_LAYER_SAVE_FLAG; 2749 if ((flags & FLAG_CLIP_CHILDREN) == FLAG_CLIP_CHILDREN || 2750 layerType != LAYER_TYPE_NONE) { 2751 layerFlags |= Canvas.CLIP_TO_LAYER_SAVE_FLAG; 2752 } 2753 if (layerType == LAYER_TYPE_NONE) { 2754 final int scrollX = hasDisplayList ? 0 : sx; 2755 final int scrollY = hasDisplayList ? 0 : sy; 2756 canvas.saveLayerAlpha(scrollX, scrollY, scrollX + cr - cl, 2757 scrollY + cb - ct, multipliedAlpha, layerFlags); 2758 } 2759 } else { 2760 // Alpha is handled by the child directly, clobber the layer's alpha 2761 child.mPrivateFlags |= ALPHA_SET; 2762 } 2763 } 2764 } 2765 } else if ((child.mPrivateFlags & ALPHA_SET) == ALPHA_SET) { 2766 child.onSetAlpha(255); 2767 child.mPrivateFlags &= ~ALPHA_SET; 2768 } 2769 2770 if ((flags & FLAG_CLIP_CHILDREN) == FLAG_CLIP_CHILDREN) { 2771 if (offsetForScroll) { 2772 canvas.clipRect(sx, sy, sx + (cr - cl), sy + (cb - ct)); 2773 } else { 2774 if (!scalingRequired || cache == null) { 2775 canvas.clipRect(0, 0, cr - cl, cb - ct); 2776 } else { 2777 canvas.clipRect(0, 0, cache.getWidth(), cache.getHeight()); 2778 } 2779 } 2780 } 2781 2782 if (hasDisplayList) { 2783 displayList = child.getDisplayList(); 2784 } 2785 2786 if (hasNoCache) { 2787 boolean layerRendered = false; 2788 if (layerType == LAYER_TYPE_HARDWARE) { 2789 final HardwareLayer layer = child.getHardwareLayer(); 2790 if (layer != null && layer.isValid()) { 2791 child.mLayerPaint.setAlpha((int) (alpha * 255)); 2792 ((HardwareCanvas) canvas).drawHardwareLayer(layer, 0, 0, child.mLayerPaint); 2793 layerRendered = true; 2794 } else { 2795 final int scrollX = hasDisplayList ? 0 : sx; 2796 final int scrollY = hasDisplayList ? 0 : sy; 2797 canvas.saveLayer(scrollX, scrollY, 2798 scrollX + cr - cl, scrollY + cb - ct, child.mLayerPaint, 2799 Canvas.HAS_ALPHA_LAYER_SAVE_FLAG | Canvas.CLIP_TO_LAYER_SAVE_FLAG); 2800 } 2801 } 2802 2803 if (!layerRendered) { 2804 if (!hasDisplayList) { 2805 // Fast path for layouts with no backgrounds 2806 if ((child.mPrivateFlags & SKIP_DRAW) == SKIP_DRAW) { 2807 if (ViewDebug.TRACE_HIERARCHY) { 2808 ViewDebug.trace(this, ViewDebug.HierarchyTraceType.DRAW); 2809 } 2810 child.mPrivateFlags &= ~DIRTY_MASK; 2811 child.dispatchDraw(canvas); 2812 } else { 2813 child.draw(canvas); 2814 } 2815 } else { 2816 child.mPrivateFlags &= ~DIRTY_MASK; 2817 ((HardwareCanvas) canvas).drawDisplayList(displayList, cr - cl, cb - ct, null); 2818 } 2819 } 2820 } else if (cache != null) { 2821 child.mPrivateFlags &= ~DIRTY_MASK; 2822 Paint cachePaint; 2823 2824 if (layerType == LAYER_TYPE_NONE) { 2825 cachePaint = mCachePaint; 2826 if (alpha < 1.0f) { 2827 cachePaint.setAlpha((int) (alpha * 255)); 2828 mGroupFlags |= FLAG_ALPHA_LOWER_THAN_ONE; 2829 } else if ((flags & FLAG_ALPHA_LOWER_THAN_ONE) == FLAG_ALPHA_LOWER_THAN_ONE) { 2830 cachePaint.setAlpha(255); 2831 mGroupFlags &= ~FLAG_ALPHA_LOWER_THAN_ONE; 2832 } 2833 } else { 2834 cachePaint = child.mLayerPaint; 2835 cachePaint.setAlpha((int) (alpha * 255)); 2836 } 2837 canvas.drawBitmap(cache, 0.0f, 0.0f, cachePaint); 2838 } 2839 2840 canvas.restoreToCount(restoreTo); 2841 2842 if (a != null && !more) { 2843 if (!hardwareAccelerated && !a.getFillAfter()) { 2844 child.onSetAlpha(255); 2845 } 2846 finishAnimatingView(child, a); 2847 } 2848 2849 if (more && hardwareAccelerated) { 2850 // invalidation is the trigger to recreate display lists, so if we're using 2851 // display lists to render, force an invalidate to allow the animation to 2852 // continue drawing another frame 2853 invalidate(true); 2854 if (a instanceof AlphaAnimation) { 2855 // alpha animations should cause the child to recreate its display list 2856 child.invalidate(true); 2857 } 2858 } 2859 2860 child.mRecreateDisplayList = false; 2861 2862 return more; 2863 } 2864 2865 /** 2866 * 2867 * @param enabled True if children should be drawn with layers, false otherwise. 2868 * 2869 * @hide 2870 */ 2871 public void setChildrenLayersEnabled(boolean enabled) { 2872 if (enabled != mDrawLayers) { 2873 mDrawLayers = enabled; 2874 invalidate(true); 2875 2876 // We need to invalidate any child with a layer. For instance, 2877 // if a child is backed by a hardware layer and we disable layers 2878 // the child is marked as not dirty (flags cleared the last time 2879 // the child was drawn inside its layer.) However, that child might 2880 // never have created its own display list or have an obsolete 2881 // display list. By invalidating the child we ensure the display 2882 // list is in sync with the content of the hardware layer. 2883 for (int i = 0; i < mChildrenCount; i++) { 2884 View child = mChildren[i]; 2885 if (child.mLayerType != LAYER_TYPE_NONE) { 2886 child.invalidate(true); 2887 } 2888 } 2889 } 2890 } 2891 2892 /** 2893 * By default, children are clipped to their bounds before drawing. This 2894 * allows view groups to override this behavior for animations, etc. 2895 * 2896 * @param clipChildren true to clip children to their bounds, 2897 * false otherwise 2898 * @attr ref android.R.styleable#ViewGroup_clipChildren 2899 */ 2900 public void setClipChildren(boolean clipChildren) { 2901 setBooleanFlag(FLAG_CLIP_CHILDREN, clipChildren); 2902 } 2903 2904 /** 2905 * By default, children are clipped to the padding of the ViewGroup. This 2906 * allows view groups to override this behavior 2907 * 2908 * @param clipToPadding true to clip children to the padding of the 2909 * group, false otherwise 2910 * @attr ref android.R.styleable#ViewGroup_clipToPadding 2911 */ 2912 public void setClipToPadding(boolean clipToPadding) { 2913 setBooleanFlag(FLAG_CLIP_TO_PADDING, clipToPadding); 2914 } 2915 2916 /** 2917 * {@inheritDoc} 2918 */ 2919 @Override 2920 public void dispatchSetSelected(boolean selected) { 2921 final View[] children = mChildren; 2922 final int count = mChildrenCount; 2923 for (int i = 0; i < count; i++) { 2924 children[i].setSelected(selected); 2925 } 2926 } 2927 2928 /** 2929 * {@inheritDoc} 2930 */ 2931 @Override 2932 public void dispatchSetActivated(boolean activated) { 2933 final View[] children = mChildren; 2934 final int count = mChildrenCount; 2935 for (int i = 0; i < count; i++) { 2936 children[i].setActivated(activated); 2937 } 2938 } 2939 2940 @Override 2941 protected void dispatchSetPressed(boolean pressed) { 2942 final View[] children = mChildren; 2943 final int count = mChildrenCount; 2944 for (int i = 0; i < count; i++) { 2945 children[i].setPressed(pressed); 2946 } 2947 } 2948 2949 /** 2950 * When this property is set to true, this ViewGroup supports static transformations on 2951 * children; this causes 2952 * {@link #getChildStaticTransformation(View, android.view.animation.Transformation)} to be 2953 * invoked when a child is drawn. 2954 * 2955 * Any subclass overriding 2956 * {@link #getChildStaticTransformation(View, android.view.animation.Transformation)} should 2957 * set this property to true. 2958 * 2959 * @param enabled True to enable static transformations on children, false otherwise. 2960 * 2961 * @see #FLAG_SUPPORT_STATIC_TRANSFORMATIONS 2962 */ 2963 protected void setStaticTransformationsEnabled(boolean enabled) { 2964 setBooleanFlag(FLAG_SUPPORT_STATIC_TRANSFORMATIONS, enabled); 2965 } 2966 2967 /** 2968 * {@inheritDoc} 2969 * 2970 * @see #setStaticTransformationsEnabled(boolean) 2971 */ 2972 protected boolean getChildStaticTransformation(View child, Transformation t) { 2973 return false; 2974 } 2975 2976 /** 2977 * {@hide} 2978 */ 2979 @Override 2980 protected View findViewTraversal(int id) { 2981 if (id == mID) { 2982 return this; 2983 } 2984 2985 final View[] where = mChildren; 2986 final int len = mChildrenCount; 2987 2988 for (int i = 0; i < len; i++) { 2989 View v = where[i]; 2990 2991 if ((v.mPrivateFlags & IS_ROOT_NAMESPACE) == 0) { 2992 v = v.findViewById(id); 2993 2994 if (v != null) { 2995 return v; 2996 } 2997 } 2998 } 2999 3000 return null; 3001 } 3002 3003 /** 3004 * {@hide} 3005 */ 3006 @Override 3007 protected View findViewWithTagTraversal(Object tag) { 3008 if (tag != null && tag.equals(mTag)) { 3009 return this; 3010 } 3011 3012 final View[] where = mChildren; 3013 final int len = mChildrenCount; 3014 3015 for (int i = 0; i < len; i++) { 3016 View v = where[i]; 3017 3018 if ((v.mPrivateFlags & IS_ROOT_NAMESPACE) == 0) { 3019 v = v.findViewWithTag(tag); 3020 3021 if (v != null) { 3022 return v; 3023 } 3024 } 3025 } 3026 3027 return null; 3028 } 3029 3030 /** 3031 * {@hide} 3032 */ 3033 @Override 3034 protected View findViewByPredicateTraversal(Predicate<View> predicate) { 3035 if (predicate.apply(this)) { 3036 return this; 3037 } 3038 3039 final View[] where = mChildren; 3040 final int len = mChildrenCount; 3041 3042 for (int i = 0; i < len; i++) { 3043 View v = where[i]; 3044 3045 if ((v.mPrivateFlags & IS_ROOT_NAMESPACE) == 0) { 3046 v = v.findViewByPredicate(predicate); 3047 3048 if (v != null) { 3049 return v; 3050 } 3051 } 3052 } 3053 3054 return null; 3055 } 3056 3057 /** 3058 * Adds a child view. If no layout parameters are already set on the child, the 3059 * default parameters for this ViewGroup are set on the child. 3060 * 3061 * @param child the child view to add 3062 * 3063 * @see #generateDefaultLayoutParams() 3064 */ 3065 public void addView(View child) { 3066 addView(child, -1); 3067 } 3068 3069 /** 3070 * Adds a child view. If no layout parameters are already set on the child, the 3071 * default parameters for this ViewGroup are set on the child. 3072 * 3073 * @param child the child view to add 3074 * @param index the position at which to add the child 3075 * 3076 * @see #generateDefaultLayoutParams() 3077 */ 3078 public void addView(View child, int index) { 3079 LayoutParams params = child.getLayoutParams(); 3080 if (params == null) { 3081 params = generateDefaultLayoutParams(); 3082 if (params == null) { 3083 throw new IllegalArgumentException("generateDefaultLayoutParams() cannot return null"); 3084 } 3085 } 3086 addView(child, index, params); 3087 } 3088 3089 /** 3090 * Adds a child view with this ViewGroup's default layout parameters and the 3091 * specified width and height. 3092 * 3093 * @param child the child view to add 3094 */ 3095 public void addView(View child, int width, int height) { 3096 final LayoutParams params = generateDefaultLayoutParams(); 3097 params.width = width; 3098 params.height = height; 3099 addView(child, -1, params); 3100 } 3101 3102 /** 3103 * Adds a child view with the specified layout parameters. 3104 * 3105 * @param child the child view to add 3106 * @param params the layout parameters to set on the child 3107 */ 3108 public void addView(View child, LayoutParams params) { 3109 addView(child, -1, params); 3110 } 3111 3112 /** 3113 * Adds a child view with the specified layout parameters. 3114 * 3115 * @param child the child view to add 3116 * @param index the position at which to add the child 3117 * @param params the layout parameters to set on the child 3118 */ 3119 public void addView(View child, int index, LayoutParams params) { 3120 if (DBG) { 3121 System.out.println(this + " addView"); 3122 } 3123 3124 // addViewInner() will call child.requestLayout() when setting the new LayoutParams 3125 // therefore, we call requestLayout() on ourselves before, so that the child's request 3126 // will be blocked at our level 3127 requestLayout(); 3128 invalidate(true); 3129 addViewInner(child, index, params, false); 3130 } 3131 3132 /** 3133 * {@inheritDoc} 3134 */ 3135 public void updateViewLayout(View view, ViewGroup.LayoutParams params) { 3136 if (!checkLayoutParams(params)) { 3137 throw new IllegalArgumentException("Invalid LayoutParams supplied to " + this); 3138 } 3139 if (view.mParent != this) { 3140 throw new IllegalArgumentException("Given view not a child of " + this); 3141 } 3142 view.setLayoutParams(params); 3143 } 3144 3145 /** 3146 * {@inheritDoc} 3147 */ 3148 protected boolean checkLayoutParams(ViewGroup.LayoutParams p) { 3149 return p != null; 3150 } 3151 3152 /** 3153 * Interface definition for a callback to be invoked when the hierarchy 3154 * within this view changed. The hierarchy changes whenever a child is added 3155 * to or removed from this view. 3156 */ 3157 public interface OnHierarchyChangeListener { 3158 /** 3159 * Called when a new child is added to a parent view. 3160 * 3161 * @param parent the view in which a child was added 3162 * @param child the new child view added in the hierarchy 3163 */ 3164 void onChildViewAdded(View parent, View child); 3165 3166 /** 3167 * Called when a child is removed from a parent view. 3168 * 3169 * @param parent the view from which the child was removed 3170 * @param child the child removed from the hierarchy 3171 */ 3172 void onChildViewRemoved(View parent, View child); 3173 } 3174 3175 /** 3176 * Register a callback to be invoked when a child is added to or removed 3177 * from this view. 3178 * 3179 * @param listener the callback to invoke on hierarchy change 3180 */ 3181 public void setOnHierarchyChangeListener(OnHierarchyChangeListener listener) { 3182 mOnHierarchyChangeListener = listener; 3183 } 3184 3185 /** 3186 * Adds a view during layout. This is useful if in your onLayout() method, 3187 * you need to add more views (as does the list view for example). 3188 * 3189 * If index is negative, it means put it at the end of the list. 3190 * 3191 * @param child the view to add to the group 3192 * @param index the index at which the child must be added 3193 * @param params the layout parameters to associate with the child 3194 * @return true if the child was added, false otherwise 3195 */ 3196 protected boolean addViewInLayout(View child, int index, LayoutParams params) { 3197 return addViewInLayout(child, index, params, false); 3198 } 3199 3200 /** 3201 * Adds a view during layout. This is useful if in your onLayout() method, 3202 * you need to add more views (as does the list view for example). 3203 * 3204 * If index is negative, it means put it at the end of the list. 3205 * 3206 * @param child the view to add to the group 3207 * @param index the index at which the child must be added 3208 * @param params the layout parameters to associate with the child 3209 * @param preventRequestLayout if true, calling this method will not trigger a 3210 * layout request on child 3211 * @return true if the child was added, false otherwise 3212 */ 3213 protected boolean addViewInLayout(View child, int index, LayoutParams params, 3214 boolean preventRequestLayout) { 3215 child.mParent = null; 3216 addViewInner(child, index, params, preventRequestLayout); 3217 child.mPrivateFlags = (child.mPrivateFlags & ~DIRTY_MASK) | DRAWN; 3218 return true; 3219 } 3220 3221 /** 3222 * Prevents the specified child to be laid out during the next layout pass. 3223 * 3224 * @param child the child on which to perform the cleanup 3225 */ 3226 protected void cleanupLayoutState(View child) { 3227 child.mPrivateFlags &= ~View.FORCE_LAYOUT; 3228 } 3229 3230 private void addViewInner(View child, int index, LayoutParams params, 3231 boolean preventRequestLayout) { 3232 3233 if (mTransition != null) { 3234 // Don't prevent other add transitions from completing, but cancel remove 3235 // transitions to let them complete the process before we add to the container 3236 mTransition.cancel(LayoutTransition.DISAPPEARING); 3237 } 3238 3239 if (child.getParent() != null) { 3240 throw new IllegalStateException("The specified child already has a parent. " + 3241 "You must call removeView() on the child's parent first."); 3242 } 3243 3244 if (mTransition != null) { 3245 mTransition.addChild(this, child); 3246 } 3247 3248 if (!checkLayoutParams(params)) { 3249 params = generateLayoutParams(params); 3250 } 3251 3252 if (preventRequestLayout) { 3253 child.mLayoutParams = params; 3254 } else { 3255 child.setLayoutParams(params); 3256 } 3257 3258 if (index < 0) { 3259 index = mChildrenCount; 3260 } 3261 3262 addInArray(child, index); 3263 3264 // tell our children 3265 if (preventRequestLayout) { 3266 child.assignParent(this); 3267 } else { 3268 child.mParent = this; 3269 } 3270 3271 if (child.hasFocus()) { 3272 requestChildFocus(child, child.findFocus()); 3273 } 3274 3275 AttachInfo ai = mAttachInfo; 3276 if (ai != null) { 3277 boolean lastKeepOn = ai.mKeepScreenOn; 3278 ai.mKeepScreenOn = false; 3279 child.dispatchAttachedToWindow(mAttachInfo, (mViewFlags&VISIBILITY_MASK)); 3280 if (ai.mKeepScreenOn) { 3281 needGlobalAttributesUpdate(true); 3282 } 3283 ai.mKeepScreenOn = lastKeepOn; 3284 } 3285 3286 if (mOnHierarchyChangeListener != null) { 3287 mOnHierarchyChangeListener.onChildViewAdded(this, child); 3288 } 3289 3290 if ((child.mViewFlags & DUPLICATE_PARENT_STATE) == DUPLICATE_PARENT_STATE) { 3291 mGroupFlags |= FLAG_NOTIFY_CHILDREN_ON_DRAWABLE_STATE_CHANGE; 3292 } 3293 } 3294 3295 private void addInArray(View child, int index) { 3296 View[] children = mChildren; 3297 final int count = mChildrenCount; 3298 final int size = children.length; 3299 if (index == count) { 3300 if (size == count) { 3301 mChildren = new View[size + ARRAY_CAPACITY_INCREMENT]; 3302 System.arraycopy(children, 0, mChildren, 0, size); 3303 children = mChildren; 3304 } 3305 children[mChildrenCount++] = child; 3306 } else if (index < count) { 3307 if (size == count) { 3308 mChildren = new View[size + ARRAY_CAPACITY_INCREMENT]; 3309 System.arraycopy(children, 0, mChildren, 0, index); 3310 System.arraycopy(children, index, mChildren, index + 1, count - index); 3311 children = mChildren; 3312 } else { 3313 System.arraycopy(children, index, children, index + 1, count - index); 3314 } 3315 children[index] = child; 3316 mChildrenCount++; 3317 if (mLastTouchDownIndex >= index) { 3318 mLastTouchDownIndex++; 3319 } 3320 } else { 3321 throw new IndexOutOfBoundsException("index=" + index + " count=" + count); 3322 } 3323 } 3324 3325 // This method also sets the child's mParent to null 3326 private void removeFromArray(int index) { 3327 final View[] children = mChildren; 3328 if (!(mTransitioningViews != null && mTransitioningViews.contains(children[index]))) { 3329 children[index].mParent = null; 3330 } 3331 final int count = mChildrenCount; 3332 if (index == count - 1) { 3333 children[--mChildrenCount] = null; 3334 } else if (index >= 0 && index < count) { 3335 System.arraycopy(children, index + 1, children, index, count - index - 1); 3336 children[--mChildrenCount] = null; 3337 } else { 3338 throw new IndexOutOfBoundsException(); 3339 } 3340 if (mLastTouchDownIndex == index) { 3341 mLastTouchDownTime = 0; 3342 mLastTouchDownIndex = -1; 3343 } else if (mLastTouchDownIndex > index) { 3344 mLastTouchDownIndex--; 3345 } 3346 } 3347 3348 // This method also sets the children's mParent to null 3349 private void removeFromArray(int start, int count) { 3350 final View[] children = mChildren; 3351 final int childrenCount = mChildrenCount; 3352 3353 start = Math.max(0, start); 3354 final int end = Math.min(childrenCount, start + count); 3355 3356 if (start == end) { 3357 return; 3358 } 3359 3360 if (end == childrenCount) { 3361 for (int i = start; i < end; i++) { 3362 children[i].mParent = null; 3363 children[i] = null; 3364 } 3365 } else { 3366 for (int i = start; i < end; i++) { 3367 children[i].mParent = null; 3368 } 3369 3370 // Since we're looping above, we might as well do the copy, but is arraycopy() 3371 // faster than the extra 2 bounds checks we would do in the loop? 3372 System.arraycopy(children, end, children, start, childrenCount - end); 3373 3374 for (int i = childrenCount - (end - start); i < childrenCount; i++) { 3375 children[i] = null; 3376 } 3377 } 3378 3379 mChildrenCount -= (end - start); 3380 } 3381 3382 private void bindLayoutAnimation(View child) { 3383 Animation a = mLayoutAnimationController.getAnimationForView(child); 3384 child.setAnimation(a); 3385 } 3386 3387 /** 3388 * Subclasses should override this method to set layout animation 3389 * parameters on the supplied child. 3390 * 3391 * @param child the child to associate with animation parameters 3392 * @param params the child's layout parameters which hold the animation 3393 * parameters 3394 * @param index the index of the child in the view group 3395 * @param count the number of children in the view group 3396 */ 3397 protected void attachLayoutAnimationParameters(View child, 3398 LayoutParams params, int index, int count) { 3399 LayoutAnimationController.AnimationParameters animationParams = 3400 params.layoutAnimationParameters; 3401 if (animationParams == null) { 3402 animationParams = new LayoutAnimationController.AnimationParameters(); 3403 params.layoutAnimationParameters = animationParams; 3404 } 3405 3406 animationParams.count = count; 3407 animationParams.index = index; 3408 } 3409 3410 /** 3411 * {@inheritDoc} 3412 */ 3413 public void removeView(View view) { 3414 removeViewInternal(view); 3415 requestLayout(); 3416 invalidate(true); 3417 } 3418 3419 /** 3420 * Removes a view during layout. This is useful if in your onLayout() method, 3421 * you need to remove more views. 3422 * 3423 * @param view the view to remove from the group 3424 */ 3425 public void removeViewInLayout(View view) { 3426 removeViewInternal(view); 3427 } 3428 3429 /** 3430 * Removes a range of views during layout. This is useful if in your onLayout() method, 3431 * you need to remove more views. 3432 * 3433 * @param start the index of the first view to remove from the group 3434 * @param count the number of views to remove from the group 3435 */ 3436 public void removeViewsInLayout(int start, int count) { 3437 removeViewsInternal(start, count); 3438 } 3439 3440 /** 3441 * Removes the view at the specified position in the group. 3442 * 3443 * @param index the position in the group of the view to remove 3444 */ 3445 public void removeViewAt(int index) { 3446 removeViewInternal(index, getChildAt(index)); 3447 requestLayout(); 3448 invalidate(true); 3449 } 3450 3451 /** 3452 * Removes the specified range of views from the group. 3453 * 3454 * @param start the first position in the group of the range of views to remove 3455 * @param count the number of views to remove 3456 */ 3457 public void removeViews(int start, int count) { 3458 removeViewsInternal(start, count); 3459 requestLayout(); 3460 invalidate(true); 3461 } 3462 3463 private void removeViewInternal(View view) { 3464 final int index = indexOfChild(view); 3465 if (index >= 0) { 3466 removeViewInternal(index, view); 3467 } 3468 } 3469 3470 private void removeViewInternal(int index, View view) { 3471 3472 if (mTransition != null) { 3473 mTransition.removeChild(this, view); 3474 } 3475 3476 boolean clearChildFocus = false; 3477 if (view == mFocused) { 3478 view.clearFocusForRemoval(); 3479 clearChildFocus = true; 3480 } 3481 3482 if (view.getAnimation() != null || 3483 (mTransitioningViews != null && mTransitioningViews.contains(view))) { 3484 addDisappearingView(view); 3485 } else if (view.mAttachInfo != null) { 3486 view.dispatchDetachedFromWindow(); 3487 } 3488 3489 if (mOnHierarchyChangeListener != null) { 3490 mOnHierarchyChangeListener.onChildViewRemoved(this, view); 3491 } 3492 3493 needGlobalAttributesUpdate(false); 3494 3495 removeFromArray(index); 3496 3497 if (clearChildFocus) { 3498 clearChildFocus(view); 3499 } 3500 } 3501 3502 /** 3503 * Sets the LayoutTransition object for this ViewGroup. If the LayoutTransition object is 3504 * not null, changes in layout which occur because of children being added to or removed from 3505 * the ViewGroup will be animated according to the animations defined in that LayoutTransition 3506 * object. By default, the transition object is null (so layout changes are not animated). 3507 * 3508 * @param transition The LayoutTransition object that will animated changes in layout. A value 3509 * of <code>null</code> means no transition will run on layout changes. 3510 * @attr ref android.R.styleable#ViewGroup_animateLayoutChanges 3511 */ 3512 public void setLayoutTransition(LayoutTransition transition) { 3513 if (mTransition != null) { 3514 mTransition.removeTransitionListener(mLayoutTransitionListener); 3515 } 3516 mTransition = transition; 3517 if (mTransition != null) { 3518 mTransition.addTransitionListener(mLayoutTransitionListener); 3519 } 3520 } 3521 3522 /** 3523 * Gets the LayoutTransition object for this ViewGroup. If the LayoutTransition object is 3524 * not null, changes in layout which occur because of children being added to or removed from 3525 * the ViewGroup will be animated according to the animations defined in that LayoutTransition 3526 * object. By default, the transition object is null (so layout changes are not animated). 3527 * 3528 * @return LayoutTranstion The LayoutTransition object that will animated changes in layout. 3529 * A value of <code>null</code> means no transition will run on layout changes. 3530 */ 3531 public LayoutTransition getLayoutTransition() { 3532 return mTransition; 3533 } 3534 3535 private void removeViewsInternal(int start, int count) { 3536 final OnHierarchyChangeListener onHierarchyChangeListener = mOnHierarchyChangeListener; 3537 final boolean notifyListener = onHierarchyChangeListener != null; 3538 final View focused = mFocused; 3539 final boolean detach = mAttachInfo != null; 3540 View clearChildFocus = null; 3541 3542 final View[] children = mChildren; 3543 final int end = start + count; 3544 3545 for (int i = start; i < end; i++) { 3546 final View view = children[i]; 3547 3548 if (mTransition != null) { 3549 mTransition.removeChild(this, view); 3550 } 3551 3552 if (view == focused) { 3553 view.clearFocusForRemoval(); 3554 clearChildFocus = view; 3555 } 3556 3557 if (view.getAnimation() != null || 3558 (mTransitioningViews != null && mTransitioningViews.contains(view))) { 3559 addDisappearingView(view); 3560 } else if (detach) { 3561 view.dispatchDetachedFromWindow(); 3562 } 3563 3564 needGlobalAttributesUpdate(false); 3565 3566 if (notifyListener) { 3567 onHierarchyChangeListener.onChildViewRemoved(this, view); 3568 } 3569 } 3570 3571 removeFromArray(start, count); 3572 3573 if (clearChildFocus != null) { 3574 clearChildFocus(clearChildFocus); 3575 } 3576 } 3577 3578 /** 3579 * Call this method to remove all child views from the 3580 * ViewGroup. 3581 */ 3582 public void removeAllViews() { 3583 removeAllViewsInLayout(); 3584 requestLayout(); 3585 invalidate(true); 3586 } 3587 3588 /** 3589 * Called by a ViewGroup subclass to remove child views from itself, 3590 * when it must first know its size on screen before it can calculate how many 3591 * child views it will render. An example is a Gallery or a ListView, which 3592 * may "have" 50 children, but actually only render the number of children 3593 * that can currently fit inside the object on screen. Do not call 3594 * this method unless you are extending ViewGroup and understand the 3595 * view measuring and layout pipeline. 3596 */ 3597 public void removeAllViewsInLayout() { 3598 final int count = mChildrenCount; 3599 if (count <= 0) { 3600 return; 3601 } 3602 3603 final View[] children = mChildren; 3604 mChildrenCount = 0; 3605 3606 final OnHierarchyChangeListener listener = mOnHierarchyChangeListener; 3607 final boolean notify = listener != null; 3608 final View focused = mFocused; 3609 final boolean detach = mAttachInfo != null; 3610 View clearChildFocus = null; 3611 3612 needGlobalAttributesUpdate(false); 3613 3614 for (int i = count - 1; i >= 0; i--) { 3615 final View view = children[i]; 3616 3617 if (mTransition != null) { 3618 mTransition.removeChild(this, view); 3619 } 3620 3621 if (view == focused) { 3622 view.clearFocusForRemoval(); 3623 clearChildFocus = view; 3624 } 3625 3626 if (view.getAnimation() != null || 3627 (mTransitioningViews != null && mTransitioningViews.contains(view))) { 3628 addDisappearingView(view); 3629 } else if (detach) { 3630 view.dispatchDetachedFromWindow(); 3631 } 3632 3633 if (notify) { 3634 listener.onChildViewRemoved(this, view); 3635 } 3636 3637 view.mParent = null; 3638 children[i] = null; 3639 } 3640 3641 if (clearChildFocus != null) { 3642 clearChildFocus(clearChildFocus); 3643 } 3644 } 3645 3646 /** 3647 * Finishes the removal of a detached view. This method will dispatch the detached from 3648 * window event and notify the hierarchy change listener. 3649 * 3650 * @param child the child to be definitely removed from the view hierarchy 3651 * @param animate if true and the view has an animation, the view is placed in the 3652 * disappearing views list, otherwise, it is detached from the window 3653 * 3654 * @see #attachViewToParent(View, int, android.view.ViewGroup.LayoutParams) 3655 * @see #detachAllViewsFromParent() 3656 * @see #detachViewFromParent(View) 3657 * @see #detachViewFromParent(int) 3658 */ 3659 protected void removeDetachedView(View child, boolean animate) { 3660 if (mTransition != null) { 3661 mTransition.removeChild(this, child); 3662 } 3663 3664 if (child == mFocused) { 3665 child.clearFocus(); 3666 } 3667 3668 if ((animate && child.getAnimation() != null) || 3669 (mTransitioningViews != null && mTransitioningViews.contains(child))) { 3670 addDisappearingView(child); 3671 } else if (child.mAttachInfo != null) { 3672 child.dispatchDetachedFromWindow(); 3673 } 3674 3675 if (mOnHierarchyChangeListener != null) { 3676 mOnHierarchyChangeListener.onChildViewRemoved(this, child); 3677 } 3678 } 3679 3680 /** 3681 * Attaches a view to this view group. Attaching a view assigns this group as the parent, 3682 * sets the layout parameters and puts the view in the list of children so it can be retrieved 3683 * by calling {@link #getChildAt(int)}. 3684 * 3685 * This method should be called only for view which were detached from their parent. 3686 * 3687 * @param child the child to attach 3688 * @param index the index at which the child should be attached 3689 * @param params the layout parameters of the child 3690 * 3691 * @see #removeDetachedView(View, boolean) 3692 * @see #detachAllViewsFromParent() 3693 * @see #detachViewFromParent(View) 3694 * @see #detachViewFromParent(int) 3695 */ 3696 protected void attachViewToParent(View child, int index, LayoutParams params) { 3697 child.mLayoutParams = params; 3698 3699 if (index < 0) { 3700 index = mChildrenCount; 3701 } 3702 3703 addInArray(child, index); 3704 3705 child.mParent = this; 3706 child.mPrivateFlags = (child.mPrivateFlags & ~DIRTY_MASK & ~DRAWING_CACHE_VALID) | 3707 DRAWN | INVALIDATED; 3708 this.mPrivateFlags |= INVALIDATED; 3709 3710 if (child.hasFocus()) { 3711 requestChildFocus(child, child.findFocus()); 3712 } 3713 } 3714 3715 /** 3716 * Detaches a view from its parent. Detaching a view should be temporary and followed 3717 * either by a call to {@link #attachViewToParent(View, int, android.view.ViewGroup.LayoutParams)} 3718 * or a call to {@link #removeDetachedView(View, boolean)}. When a view is detached, 3719 * its parent is null and cannot be retrieved by a call to {@link #getChildAt(int)}. 3720 * 3721 * @param child the child to detach 3722 * 3723 * @see #detachViewFromParent(int) 3724 * @see #detachViewsFromParent(int, int) 3725 * @see #detachAllViewsFromParent() 3726 * @see #attachViewToParent(View, int, android.view.ViewGroup.LayoutParams) 3727 * @see #removeDetachedView(View, boolean) 3728 */ 3729 protected void detachViewFromParent(View child) { 3730 removeFromArray(indexOfChild(child)); 3731 } 3732 3733 /** 3734 * Detaches a view from its parent. Detaching a view should be temporary and followed 3735 * either by a call to {@link #attachViewToParent(View, int, android.view.ViewGroup.LayoutParams)} 3736 * or a call to {@link #removeDetachedView(View, boolean)}. When a view is detached, 3737 * its parent is null and cannot be retrieved by a call to {@link #getChildAt(int)}. 3738 * 3739 * @param index the index of the child to detach 3740 * 3741 * @see #detachViewFromParent(View) 3742 * @see #detachAllViewsFromParent() 3743 * @see #detachViewsFromParent(int, int) 3744 * @see #attachViewToParent(View, int, android.view.ViewGroup.LayoutParams) 3745 * @see #removeDetachedView(View, boolean) 3746 */ 3747 protected void detachViewFromParent(int index) { 3748 removeFromArray(index); 3749 } 3750 3751 /** 3752 * Detaches a range of view from their parent. Detaching a view should be temporary and followed 3753 * either by a call to {@link #attachViewToParent(View, int, android.view.ViewGroup.LayoutParams)} 3754 * or a call to {@link #removeDetachedView(View, boolean)}. When a view is detached, its 3755 * parent is null and cannot be retrieved by a call to {@link #getChildAt(int)}. 3756 * 3757 * @param start the first index of the childrend range to detach 3758 * @param count the number of children to detach 3759 * 3760 * @see #detachViewFromParent(View) 3761 * @see #detachViewFromParent(int) 3762 * @see #detachAllViewsFromParent() 3763 * @see #attachViewToParent(View, int, android.view.ViewGroup.LayoutParams) 3764 * @see #removeDetachedView(View, boolean) 3765 */ 3766 protected void detachViewsFromParent(int start, int count) { 3767 removeFromArray(start, count); 3768 } 3769 3770 /** 3771 * Detaches all views from the parent. Detaching a view should be temporary and followed 3772 * either by a call to {@link #attachViewToParent(View, int, android.view.ViewGroup.LayoutParams)} 3773 * or a call to {@link #removeDetachedView(View, boolean)}. When a view is detached, 3774 * its parent is null and cannot be retrieved by a call to {@link #getChildAt(int)}. 3775 * 3776 * @see #detachViewFromParent(View) 3777 * @see #detachViewFromParent(int) 3778 * @see #detachViewsFromParent(int, int) 3779 * @see #attachViewToParent(View, int, android.view.ViewGroup.LayoutParams) 3780 * @see #removeDetachedView(View, boolean) 3781 */ 3782 protected void detachAllViewsFromParent() { 3783 final int count = mChildrenCount; 3784 if (count <= 0) { 3785 return; 3786 } 3787 3788 final View[] children = mChildren; 3789 mChildrenCount = 0; 3790 3791 for (int i = count - 1; i >= 0; i--) { 3792 children[i].mParent = null; 3793 children[i] = null; 3794 } 3795 } 3796 3797 /** 3798 * Don't call or override this method. It is used for the implementation of 3799 * the view hierarchy. 3800 */ 3801 public final void invalidateChild(View child, final Rect dirty) { 3802 if (ViewDebug.TRACE_HIERARCHY) { 3803 ViewDebug.trace(this, ViewDebug.HierarchyTraceType.INVALIDATE_CHILD); 3804 } 3805 3806 ViewParent parent = this; 3807 3808 final AttachInfo attachInfo = mAttachInfo; 3809 if (attachInfo != null) { 3810 // If the child is drawing an animation, we want to copy this flag onto 3811 // ourselves and the parent to make sure the invalidate request goes 3812 // through 3813 final boolean drawAnimation = (child.mPrivateFlags & DRAW_ANIMATION) == DRAW_ANIMATION; 3814 3815 if (dirty == null) { 3816 if (child.mLayerType != LAYER_TYPE_NONE) { 3817 mPrivateFlags |= INVALIDATED; 3818 mPrivateFlags &= ~DRAWING_CACHE_VALID; 3819 child.mLocalDirtyRect.setEmpty(); 3820 } 3821 do { 3822 View view = null; 3823 if (parent instanceof View) { 3824 view = (View) parent; 3825 if (view.mLayerType != LAYER_TYPE_NONE) { 3826 view.mLocalDirtyRect.setEmpty(); 3827 if (view.getParent() instanceof View) { 3828 final View grandParent = (View) view.getParent(); 3829 grandParent.mPrivateFlags |= INVALIDATED; 3830 grandParent.mPrivateFlags &= ~DRAWING_CACHE_VALID; 3831 } 3832 } 3833 if ((view.mPrivateFlags & DIRTY_MASK) != 0) { 3834 // already marked dirty - we're done 3835 break; 3836 } 3837 } 3838 3839 if (drawAnimation) { 3840 if (view != null) { 3841 view.mPrivateFlags |= DRAW_ANIMATION; 3842 } else if (parent instanceof ViewRootImpl) { 3843 ((ViewRootImpl) parent).mIsAnimating = true; 3844 } 3845 } 3846 3847 if (parent instanceof ViewRootImpl) { 3848 ((ViewRootImpl) parent).invalidate(); 3849 parent = null; 3850 } else if (view != null) { 3851 if ((view.mPrivateFlags & DRAWN) == DRAWN || 3852 (view.mPrivateFlags & DRAWING_CACHE_VALID) == DRAWING_CACHE_VALID) { 3853 view.mPrivateFlags &= ~DRAWING_CACHE_VALID; 3854 view.mPrivateFlags |= DIRTY; 3855 parent = view.mParent; 3856 } else { 3857 parent = null; 3858 } 3859 } 3860 } while (parent != null); 3861 } else { 3862 // Check whether the child that requests the invalidate is fully opaque 3863 final boolean isOpaque = child.isOpaque() && !drawAnimation && 3864 child.getAnimation() == null; 3865 // Mark the child as dirty, using the appropriate flag 3866 // Make sure we do not set both flags at the same time 3867 int opaqueFlag = isOpaque ? DIRTY_OPAQUE : DIRTY; 3868 3869 if (child.mLayerType != LAYER_TYPE_NONE) { 3870 mPrivateFlags |= INVALIDATED; 3871 mPrivateFlags &= ~DRAWING_CACHE_VALID; 3872 child.mLocalDirtyRect.union(dirty); 3873 } 3874 3875 final int[] location = attachInfo.mInvalidateChildLocation; 3876 location[CHILD_LEFT_INDEX] = child.mLeft; 3877 location[CHILD_TOP_INDEX] = child.mTop; 3878 Matrix childMatrix = child.getMatrix(); 3879 if (!childMatrix.isIdentity()) { 3880 RectF boundingRect = attachInfo.mTmpTransformRect; 3881 boundingRect.set(dirty); 3882 //boundingRect.inset(-0.5f, -0.5f); 3883 childMatrix.mapRect(boundingRect); 3884 dirty.set((int) (boundingRect.left - 0.5f), 3885 (int) (boundingRect.top - 0.5f), 3886 (int) (boundingRect.right + 0.5f), 3887 (int) (boundingRect.bottom + 0.5f)); 3888 } 3889 3890 do { 3891 View view = null; 3892 if (parent instanceof View) { 3893 view = (View) parent; 3894 if (view.mLayerType != LAYER_TYPE_NONE && 3895 view.getParent() instanceof View) { 3896 final View grandParent = (View) view.getParent(); 3897 grandParent.mPrivateFlags |= INVALIDATED; 3898 grandParent.mPrivateFlags &= ~DRAWING_CACHE_VALID; 3899 } 3900 } 3901 3902 if (drawAnimation) { 3903 if (view != null) { 3904 view.mPrivateFlags |= DRAW_ANIMATION; 3905 } else if (parent instanceof ViewRootImpl) { 3906 ((ViewRootImpl) parent).mIsAnimating = true; 3907 } 3908 } 3909 3910 // If the parent is dirty opaque or not dirty, mark it dirty with the opaque 3911 // flag coming from the child that initiated the invalidate 3912 if (view != null) { 3913 if ((view.mViewFlags & FADING_EDGE_MASK) != 0 && 3914 view.getSolidColor() == 0) { 3915 opaqueFlag = DIRTY; 3916 } 3917 if ((view.mPrivateFlags & DIRTY_MASK) != DIRTY) { 3918 view.mPrivateFlags = (view.mPrivateFlags & ~DIRTY_MASK) | opaqueFlag; 3919 } 3920 } 3921 3922 parent = parent.invalidateChildInParent(location, dirty); 3923 if (view != null) { 3924 // Account for transform on current parent 3925 Matrix m = view.getMatrix(); 3926 if (!m.isIdentity()) { 3927 RectF boundingRect = attachInfo.mTmpTransformRect; 3928 boundingRect.set(dirty); 3929 m.mapRect(boundingRect); 3930 dirty.set((int) boundingRect.left, (int) boundingRect.top, 3931 (int) (boundingRect.right + 0.5f), 3932 (int) (boundingRect.bottom + 0.5f)); 3933 } 3934 } 3935 } while (parent != null); 3936 } 3937 } 3938 } 3939 3940 /** 3941 * Don't call or override this method. It is used for the implementation of 3942 * the view hierarchy. 3943 * 3944 * This implementation returns null if this ViewGroup does not have a parent, 3945 * if this ViewGroup is already fully invalidated or if the dirty rectangle 3946 * does not intersect with this ViewGroup's bounds. 3947 */ 3948 public ViewParent invalidateChildInParent(final int[] location, final Rect dirty) { 3949 if (ViewDebug.TRACE_HIERARCHY) { 3950 ViewDebug.trace(this, ViewDebug.HierarchyTraceType.INVALIDATE_CHILD_IN_PARENT); 3951 } 3952 3953 if ((mPrivateFlags & DRAWN) == DRAWN || 3954 (mPrivateFlags & DRAWING_CACHE_VALID) == DRAWING_CACHE_VALID) { 3955 if ((mGroupFlags & (FLAG_OPTIMIZE_INVALIDATE | FLAG_ANIMATION_DONE)) != 3956 FLAG_OPTIMIZE_INVALIDATE) { 3957 dirty.offset(location[CHILD_LEFT_INDEX] - mScrollX, 3958 location[CHILD_TOP_INDEX] - mScrollY); 3959 3960 final int left = mLeft; 3961 final int top = mTop; 3962 3963 if (dirty.intersect(0, 0, mRight - left, mBottom - top) || 3964 (mPrivateFlags & DRAW_ANIMATION) == DRAW_ANIMATION) { 3965 mPrivateFlags &= ~DRAWING_CACHE_VALID; 3966 3967 location[CHILD_LEFT_INDEX] = left; 3968 location[CHILD_TOP_INDEX] = top; 3969 3970 if (mLayerType != LAYER_TYPE_NONE) { 3971 mLocalDirtyRect.union(dirty); 3972 } 3973 3974 return mParent; 3975 } 3976 } else { 3977 mPrivateFlags &= ~DRAWN & ~DRAWING_CACHE_VALID; 3978 3979 location[CHILD_LEFT_INDEX] = mLeft; 3980 location[CHILD_TOP_INDEX] = mTop; 3981 3982 dirty.set(0, 0, mRight - mLeft, mBottom - mTop); 3983 3984 if (mLayerType != LAYER_TYPE_NONE) { 3985 mLocalDirtyRect.union(dirty); 3986 } 3987 3988 return mParent; 3989 } 3990 } 3991 3992 return null; 3993 } 3994 3995 /** 3996 * Offset a rectangle that is in a descendant's coordinate 3997 * space into our coordinate space. 3998 * @param descendant A descendant of this view 3999 * @param rect A rectangle defined in descendant's coordinate space. 4000 */ 4001 public final void offsetDescendantRectToMyCoords(View descendant, Rect rect) { 4002 offsetRectBetweenParentAndChild(descendant, rect, true, false); 4003 } 4004 4005 /** 4006 * Offset a rectangle that is in our coordinate space into an ancestor's 4007 * coordinate space. 4008 * @param descendant A descendant of this view 4009 * @param rect A rectangle defined in descendant's coordinate space. 4010 */ 4011 public final void offsetRectIntoDescendantCoords(View descendant, Rect rect) { 4012 offsetRectBetweenParentAndChild(descendant, rect, false, false); 4013 } 4014 4015 /** 4016 * Helper method that offsets a rect either from parent to descendant or 4017 * descendant to parent. 4018 */ 4019 void offsetRectBetweenParentAndChild(View descendant, Rect rect, 4020 boolean offsetFromChildToParent, boolean clipToBounds) { 4021 4022 // already in the same coord system :) 4023 if (descendant == this) { 4024 return; 4025 } 4026 4027 ViewParent theParent = descendant.mParent; 4028 4029 // search and offset up to the parent 4030 while ((theParent != null) 4031 && (theParent instanceof View) 4032 && (theParent != this)) { 4033 4034 if (offsetFromChildToParent) { 4035 rect.offset(descendant.mLeft - descendant.mScrollX, 4036 descendant.mTop - descendant.mScrollY); 4037 if (clipToBounds) { 4038 View p = (View) theParent; 4039 rect.intersect(0, 0, p.mRight - p.mLeft, p.mBottom - p.mTop); 4040 } 4041 } else { 4042 if (clipToBounds) { 4043 View p = (View) theParent; 4044 rect.intersect(0, 0, p.mRight - p.mLeft, p.mBottom - p.mTop); 4045 } 4046 rect.offset(descendant.mScrollX - descendant.mLeft, 4047 descendant.mScrollY - descendant.mTop); 4048 } 4049 4050 descendant = (View) theParent; 4051 theParent = descendant.mParent; 4052 } 4053 4054 // now that we are up to this view, need to offset one more time 4055 // to get into our coordinate space 4056 if (theParent == this) { 4057 if (offsetFromChildToParent) { 4058 rect.offset(descendant.mLeft - descendant.mScrollX, 4059 descendant.mTop - descendant.mScrollY); 4060 } else { 4061 rect.offset(descendant.mScrollX - descendant.mLeft, 4062 descendant.mScrollY - descendant.mTop); 4063 } 4064 } else { 4065 throw new IllegalArgumentException("parameter must be a descendant of this view"); 4066 } 4067 } 4068 4069 /** 4070 * Offset the vertical location of all children of this view by the specified number of pixels. 4071 * 4072 * @param offset the number of pixels to offset 4073 * 4074 * @hide 4075 */ 4076 public void offsetChildrenTopAndBottom(int offset) { 4077 final int count = mChildrenCount; 4078 final View[] children = mChildren; 4079 4080 for (int i = 0; i < count; i++) { 4081 final View v = children[i]; 4082 v.mTop += offset; 4083 v.mBottom += offset; 4084 } 4085 } 4086 4087 /** 4088 * {@inheritDoc} 4089 */ 4090 public boolean getChildVisibleRect(View child, Rect r, android.graphics.Point offset) { 4091 int dx = child.mLeft - mScrollX; 4092 int dy = child.mTop - mScrollY; 4093 if (offset != null) { 4094 offset.x += dx; 4095 offset.y += dy; 4096 } 4097 r.offset(dx, dy); 4098 return r.intersect(0, 0, mRight - mLeft, mBottom - mTop) && 4099 (mParent == null || mParent.getChildVisibleRect(this, r, offset)); 4100 } 4101 4102 /** 4103 * {@inheritDoc} 4104 */ 4105 @Override 4106 public final void layout(int l, int t, int r, int b) { 4107 if (mTransition == null || !mTransition.isChangingLayout()) { 4108 super.layout(l, t, r, b); 4109 } else { 4110 // record the fact that we noop'd it; request layout when transition finishes 4111 mLayoutSuppressed = true; 4112 } 4113 } 4114 4115 /** 4116 * {@inheritDoc} 4117 */ 4118 @Override 4119 protected abstract void onLayout(boolean changed, 4120 int l, int t, int r, int b); 4121 4122 /** 4123 * Indicates whether the view group has the ability to animate its children 4124 * after the first layout. 4125 * 4126 * @return true if the children can be animated, false otherwise 4127 */ 4128 protected boolean canAnimate() { 4129 return mLayoutAnimationController != null; 4130 } 4131 4132 /** 4133 * Runs the layout animation. Calling this method triggers a relayout of 4134 * this view group. 4135 */ 4136 public void startLayoutAnimation() { 4137 if (mLayoutAnimationController != null) { 4138 mGroupFlags |= FLAG_RUN_ANIMATION; 4139 requestLayout(); 4140 } 4141 } 4142 4143 /** 4144 * Schedules the layout animation to be played after the next layout pass 4145 * of this view group. This can be used to restart the layout animation 4146 * when the content of the view group changes or when the activity is 4147 * paused and resumed. 4148 */ 4149 public void scheduleLayoutAnimation() { 4150 mGroupFlags |= FLAG_RUN_ANIMATION; 4151 } 4152 4153 /** 4154 * Sets the layout animation controller used to animate the group's 4155 * children after the first layout. 4156 * 4157 * @param controller the animation controller 4158 */ 4159 public void setLayoutAnimation(LayoutAnimationController controller) { 4160 mLayoutAnimationController = controller; 4161 if (mLayoutAnimationController != null) { 4162 mGroupFlags |= FLAG_RUN_ANIMATION; 4163 } 4164 } 4165 4166 /** 4167 * Returns the layout animation controller used to animate the group's 4168 * children. 4169 * 4170 * @return the current animation controller 4171 */ 4172 public LayoutAnimationController getLayoutAnimation() { 4173 return mLayoutAnimationController; 4174 } 4175 4176 /** 4177 * Indicates whether the children's drawing cache is used during a layout 4178 * animation. By default, the drawing cache is enabled but this will prevent 4179 * nested layout animations from working. To nest animations, you must disable 4180 * the cache. 4181 * 4182 * @return true if the animation cache is enabled, false otherwise 4183 * 4184 * @see #setAnimationCacheEnabled(boolean) 4185 * @see View#setDrawingCacheEnabled(boolean) 4186 */ 4187 @ViewDebug.ExportedProperty 4188 public boolean isAnimationCacheEnabled() { 4189 return (mGroupFlags & FLAG_ANIMATION_CACHE) == FLAG_ANIMATION_CACHE; 4190 } 4191 4192 /** 4193 * Enables or disables the children's drawing cache during a layout animation. 4194 * By default, the drawing cache is enabled but this will prevent nested 4195 * layout animations from working. To nest animations, you must disable the 4196 * cache. 4197 * 4198 * @param enabled true to enable the animation cache, false otherwise 4199 * 4200 * @see #isAnimationCacheEnabled() 4201 * @see View#setDrawingCacheEnabled(boolean) 4202 */ 4203 public void setAnimationCacheEnabled(boolean enabled) { 4204 setBooleanFlag(FLAG_ANIMATION_CACHE, enabled); 4205 } 4206 4207 /** 4208 * Indicates whether this ViewGroup will always try to draw its children using their 4209 * drawing cache. By default this property is enabled. 4210 * 4211 * @return true if the animation cache is enabled, false otherwise 4212 * 4213 * @see #setAlwaysDrawnWithCacheEnabled(boolean) 4214 * @see #setChildrenDrawnWithCacheEnabled(boolean) 4215 * @see View#setDrawingCacheEnabled(boolean) 4216 */ 4217 @ViewDebug.ExportedProperty(category = "drawing") 4218 public boolean isAlwaysDrawnWithCacheEnabled() { 4219 return (mGroupFlags & FLAG_ALWAYS_DRAWN_WITH_CACHE) == FLAG_ALWAYS_DRAWN_WITH_CACHE; 4220 } 4221 4222 /** 4223 * Indicates whether this ViewGroup will always try to draw its children using their 4224 * drawing cache. This property can be set to true when the cache rendering is 4225 * slightly different from the children's normal rendering. Renderings can be different, 4226 * for instance, when the cache's quality is set to low. 4227 * 4228 * When this property is disabled, the ViewGroup will use the drawing cache of its 4229 * children only when asked to. It's usually the task of subclasses to tell ViewGroup 4230 * when to start using the drawing cache and when to stop using it. 4231 * 4232 * @param always true to always draw with the drawing cache, false otherwise 4233 * 4234 * @see #isAlwaysDrawnWithCacheEnabled() 4235 * @see #setChildrenDrawnWithCacheEnabled(boolean) 4236 * @see View#setDrawingCacheEnabled(boolean) 4237 * @see View#setDrawingCacheQuality(int) 4238 */ 4239 public void setAlwaysDrawnWithCacheEnabled(boolean always) { 4240 setBooleanFlag(FLAG_ALWAYS_DRAWN_WITH_CACHE, always); 4241 } 4242 4243 /** 4244 * Indicates whether the ViewGroup is currently drawing its children using 4245 * their drawing cache. 4246 * 4247 * @return true if children should be drawn with their cache, false otherwise 4248 * 4249 * @see #setAlwaysDrawnWithCacheEnabled(boolean) 4250 * @see #setChildrenDrawnWithCacheEnabled(boolean) 4251 */ 4252 @ViewDebug.ExportedProperty(category = "drawing") 4253 protected boolean isChildrenDrawnWithCacheEnabled() { 4254 return (mGroupFlags & FLAG_CHILDREN_DRAWN_WITH_CACHE) == FLAG_CHILDREN_DRAWN_WITH_CACHE; 4255 } 4256 4257 /** 4258 * Tells the ViewGroup to draw its children using their drawing cache. This property 4259 * is ignored when {@link #isAlwaysDrawnWithCacheEnabled()} is true. A child's drawing cache 4260 * will be used only if it has been enabled. 4261 * 4262 * Subclasses should call this method to start and stop using the drawing cache when 4263 * they perform performance sensitive operations, like scrolling or animating. 4264 * 4265 * @param enabled true if children should be drawn with their cache, false otherwise 4266 * 4267 * @see #setAlwaysDrawnWithCacheEnabled(boolean) 4268 * @see #isChildrenDrawnWithCacheEnabled() 4269 */ 4270 protected void setChildrenDrawnWithCacheEnabled(boolean enabled) { 4271 setBooleanFlag(FLAG_CHILDREN_DRAWN_WITH_CACHE, enabled); 4272 } 4273 4274 /** 4275 * Indicates whether the ViewGroup is drawing its children in the order defined by 4276 * {@link #getChildDrawingOrder(int, int)}. 4277 * 4278 * @return true if children drawing order is defined by {@link #getChildDrawingOrder(int, int)}, 4279 * false otherwise 4280 * 4281 * @see #setChildrenDrawingOrderEnabled(boolean) 4282 * @see #getChildDrawingOrder(int, int) 4283 */ 4284 @ViewDebug.ExportedProperty(category = "drawing") 4285 protected boolean isChildrenDrawingOrderEnabled() { 4286 return (mGroupFlags & FLAG_USE_CHILD_DRAWING_ORDER) == FLAG_USE_CHILD_DRAWING_ORDER; 4287 } 4288 4289 /** 4290 * Tells the ViewGroup whether to draw its children in the order defined by the method 4291 * {@link #getChildDrawingOrder(int, int)}. 4292 * 4293 * @param enabled true if the order of the children when drawing is determined by 4294 * {@link #getChildDrawingOrder(int, int)}, false otherwise 4295 * 4296 * @see #isChildrenDrawingOrderEnabled() 4297 * @see #getChildDrawingOrder(int, int) 4298 */ 4299 protected void setChildrenDrawingOrderEnabled(boolean enabled) { 4300 setBooleanFlag(FLAG_USE_CHILD_DRAWING_ORDER, enabled); 4301 } 4302 4303 private void setBooleanFlag(int flag, boolean value) { 4304 if (value) { 4305 mGroupFlags |= flag; 4306 } else { 4307 mGroupFlags &= ~flag; 4308 } 4309 } 4310 4311 /** 4312 * Returns an integer indicating what types of drawing caches are kept in memory. 4313 * 4314 * @see #setPersistentDrawingCache(int) 4315 * @see #setAnimationCacheEnabled(boolean) 4316 * 4317 * @return one or a combination of {@link #PERSISTENT_NO_CACHE}, 4318 * {@link #PERSISTENT_ANIMATION_CACHE}, {@link #PERSISTENT_SCROLLING_CACHE} 4319 * and {@link #PERSISTENT_ALL_CACHES} 4320 */ 4321 @ViewDebug.ExportedProperty(category = "drawing", mapping = { 4322 @ViewDebug.IntToString(from = PERSISTENT_NO_CACHE, to = "NONE"), 4323 @ViewDebug.IntToString(from = PERSISTENT_ANIMATION_CACHE, to = "ANIMATION"), 4324 @ViewDebug.IntToString(from = PERSISTENT_SCROLLING_CACHE, to = "SCROLLING"), 4325 @ViewDebug.IntToString(from = PERSISTENT_ALL_CACHES, to = "ALL") 4326 }) 4327 public int getPersistentDrawingCache() { 4328 return mPersistentDrawingCache; 4329 } 4330 4331 /** 4332 * Indicates what types of drawing caches should be kept in memory after 4333 * they have been created. 4334 * 4335 * @see #getPersistentDrawingCache() 4336 * @see #setAnimationCacheEnabled(boolean) 4337 * 4338 * @param drawingCacheToKeep one or a combination of {@link #PERSISTENT_NO_CACHE}, 4339 * {@link #PERSISTENT_ANIMATION_CACHE}, {@link #PERSISTENT_SCROLLING_CACHE} 4340 * and {@link #PERSISTENT_ALL_CACHES} 4341 */ 4342 public void setPersistentDrawingCache(int drawingCacheToKeep) { 4343 mPersistentDrawingCache = drawingCacheToKeep & PERSISTENT_ALL_CACHES; 4344 } 4345 4346 /** 4347 * Returns a new set of layout parameters based on the supplied attributes set. 4348 * 4349 * @param attrs the attributes to build the layout parameters from 4350 * 4351 * @return an instance of {@link android.view.ViewGroup.LayoutParams} or one 4352 * of its descendants 4353 */ 4354 public LayoutParams generateLayoutParams(AttributeSet attrs) { 4355 return new LayoutParams(getContext(), attrs); 4356 } 4357 4358 /** 4359 * Returns a safe set of layout parameters based on the supplied layout params. 4360 * When a ViewGroup is passed a View whose layout params do not pass the test of 4361 * {@link #checkLayoutParams(android.view.ViewGroup.LayoutParams)}, this method 4362 * is invoked. This method should return a new set of layout params suitable for 4363 * this ViewGroup, possibly by copying the appropriate attributes from the 4364 * specified set of layout params. 4365 * 4366 * @param p The layout parameters to convert into a suitable set of layout parameters 4367 * for this ViewGroup. 4368 * 4369 * @return an instance of {@link android.view.ViewGroup.LayoutParams} or one 4370 * of its descendants 4371 */ 4372 protected LayoutParams generateLayoutParams(ViewGroup.LayoutParams p) { 4373 return p; 4374 } 4375 4376 /** 4377 * Returns a set of default layout parameters. These parameters are requested 4378 * when the View passed to {@link #addView(View)} has no layout parameters 4379 * already set. If null is returned, an exception is thrown from addView. 4380 * 4381 * @return a set of default layout parameters or null 4382 */ 4383 protected LayoutParams generateDefaultLayoutParams() { 4384 return new LayoutParams(LayoutParams.WRAP_CONTENT, LayoutParams.WRAP_CONTENT); 4385 } 4386 4387 /** 4388 * @hide 4389 */ 4390 @Override 4391 protected boolean dispatchConsistencyCheck(int consistency) { 4392 boolean result = super.dispatchConsistencyCheck(consistency); 4393 4394 final int count = mChildrenCount; 4395 final View[] children = mChildren; 4396 for (int i = 0; i < count; i++) { 4397 if (!children[i].dispatchConsistencyCheck(consistency)) result = false; 4398 } 4399 4400 return result; 4401 } 4402 4403 /** 4404 * @hide 4405 */ 4406 @Override 4407 protected boolean onConsistencyCheck(int consistency) { 4408 boolean result = super.onConsistencyCheck(consistency); 4409 4410 final boolean checkLayout = (consistency & ViewDebug.CONSISTENCY_LAYOUT) != 0; 4411 final boolean checkDrawing = (consistency & ViewDebug.CONSISTENCY_DRAWING) != 0; 4412 4413 if (checkLayout) { 4414 final int count = mChildrenCount; 4415 final View[] children = mChildren; 4416 for (int i = 0; i < count; i++) { 4417 if (children[i].getParent() != this) { 4418 result = false; 4419 android.util.Log.d(ViewDebug.CONSISTENCY_LOG_TAG, 4420 "View " + children[i] + " has no parent/a parent that is not " + this); 4421 } 4422 } 4423 } 4424 4425 if (checkDrawing) { 4426 // If this group is dirty, check that the parent is dirty as well 4427 if ((mPrivateFlags & DIRTY_MASK) != 0) { 4428 final ViewParent parent = getParent(); 4429 if (parent != null && !(parent instanceof ViewRootImpl)) { 4430 if ((((View) parent).mPrivateFlags & DIRTY_MASK) == 0) { 4431 result = false; 4432 android.util.Log.d(ViewDebug.CONSISTENCY_LOG_TAG, 4433 "ViewGroup " + this + " is dirty but its parent is not: " + this); 4434 } 4435 } 4436 } 4437 } 4438 4439 return result; 4440 } 4441 4442 /** 4443 * {@inheritDoc} 4444 */ 4445 @Override 4446 protected void debug(int depth) { 4447 super.debug(depth); 4448 String output; 4449 4450 if (mFocused != null) { 4451 output = debugIndent(depth); 4452 output += "mFocused"; 4453 Log.d(VIEW_LOG_TAG, output); 4454 } 4455 if (mChildrenCount != 0) { 4456 output = debugIndent(depth); 4457 output += "{"; 4458 Log.d(VIEW_LOG_TAG, output); 4459 } 4460 int count = mChildrenCount; 4461 for (int i = 0; i < count; i++) { 4462 View child = mChildren[i]; 4463 child.debug(depth + 1); 4464 } 4465 4466 if (mChildrenCount != 0) { 4467 output = debugIndent(depth); 4468 output += "}"; 4469 Log.d(VIEW_LOG_TAG, output); 4470 } 4471 } 4472 4473 /** 4474 * Returns the position in the group of the specified child view. 4475 * 4476 * @param child the view for which to get the position 4477 * @return a positive integer representing the position of the view in the 4478 * group, or -1 if the view does not exist in the group 4479 */ 4480 public int indexOfChild(View child) { 4481 final int count = mChildrenCount; 4482 final View[] children = mChildren; 4483 for (int i = 0; i < count; i++) { 4484 if (children[i] == child) { 4485 return i; 4486 } 4487 } 4488 return -1; 4489 } 4490 4491 /** 4492 * Returns the number of children in the group. 4493 * 4494 * @return a positive integer representing the number of children in 4495 * the group 4496 */ 4497 public int getChildCount() { 4498 return mChildrenCount; 4499 } 4500 4501 /** 4502 * Returns the view at the specified position in the group. 4503 * 4504 * @param index the position at which to get the view from 4505 * @return the view at the specified position or null if the position 4506 * does not exist within the group 4507 */ 4508 public View getChildAt(int index) { 4509 if (index < 0 || index >= mChildrenCount) { 4510 return null; 4511 } 4512 return mChildren[index]; 4513 } 4514 4515 /** 4516 * Ask all of the children of this view to measure themselves, taking into 4517 * account both the MeasureSpec requirements for this view and its padding. 4518 * We skip children that are in the GONE state The heavy lifting is done in 4519 * getChildMeasureSpec. 4520 * 4521 * @param widthMeasureSpec The width requirements for this view 4522 * @param heightMeasureSpec The height requirements for this view 4523 */ 4524 protected void measureChildren(int widthMeasureSpec, int heightMeasureSpec) { 4525 final int size = mChildrenCount; 4526 final View[] children = mChildren; 4527 for (int i = 0; i < size; ++i) { 4528 final View child = children[i]; 4529 if ((child.mViewFlags & VISIBILITY_MASK) != GONE) { 4530 measureChild(child, widthMeasureSpec, heightMeasureSpec); 4531 } 4532 } 4533 } 4534 4535 /** 4536 * Ask one of the children of this view to measure itself, taking into 4537 * account both the MeasureSpec requirements for this view and its padding. 4538 * The heavy lifting is done in getChildMeasureSpec. 4539 * 4540 * @param child The child to measure 4541 * @param parentWidthMeasureSpec The width requirements for this view 4542 * @param parentHeightMeasureSpec The height requirements for this view 4543 */ 4544 protected void measureChild(View child, int parentWidthMeasureSpec, 4545 int parentHeightMeasureSpec) { 4546 final LayoutParams lp = child.getLayoutParams(); 4547 4548 final int childWidthMeasureSpec = getChildMeasureSpec(parentWidthMeasureSpec, 4549 mPaddingLeft + mPaddingRight, lp.width); 4550 final int childHeightMeasureSpec = getChildMeasureSpec(parentHeightMeasureSpec, 4551 mPaddingTop + mPaddingBottom, lp.height); 4552 4553 child.measure(childWidthMeasureSpec, childHeightMeasureSpec); 4554 } 4555 4556 /** 4557 * Ask one of the children of this view to measure itself, taking into 4558 * account both the MeasureSpec requirements for this view and its padding 4559 * and margins. The child must have MarginLayoutParams The heavy lifting is 4560 * done in getChildMeasureSpec. 4561 * 4562 * @param child The child to measure 4563 * @param parentWidthMeasureSpec The width requirements for this view 4564 * @param widthUsed Extra space that has been used up by the parent 4565 * horizontally (possibly by other children of the parent) 4566 * @param parentHeightMeasureSpec The height requirements for this view 4567 * @param heightUsed Extra space that has been used up by the parent 4568 * vertically (possibly by other children of the parent) 4569 */ 4570 protected void measureChildWithMargins(View child, 4571 int parentWidthMeasureSpec, int widthUsed, 4572 int parentHeightMeasureSpec, int heightUsed) { 4573 final MarginLayoutParams lp = (MarginLayoutParams) child.getLayoutParams(); 4574 4575 final int childWidthMeasureSpec = getChildMeasureSpec(parentWidthMeasureSpec, 4576 mPaddingLeft + mPaddingRight + lp.leftMargin + lp.rightMargin 4577 + widthUsed, lp.width); 4578 final int childHeightMeasureSpec = getChildMeasureSpec(parentHeightMeasureSpec, 4579 mPaddingTop + mPaddingBottom + lp.topMargin + lp.bottomMargin 4580 + heightUsed, lp.height); 4581 4582 child.measure(childWidthMeasureSpec, childHeightMeasureSpec); 4583 } 4584 4585 /** 4586 * Does the hard part of measureChildren: figuring out the MeasureSpec to 4587 * pass to a particular child. This method figures out the right MeasureSpec 4588 * for one dimension (height or width) of one child view. 4589 * 4590 * The goal is to combine information from our MeasureSpec with the 4591 * LayoutParams of the child to get the best possible results. For example, 4592 * if the this view knows its size (because its MeasureSpec has a mode of 4593 * EXACTLY), and the child has indicated in its LayoutParams that it wants 4594 * to be the same size as the parent, the parent should ask the child to 4595 * layout given an exact size. 4596 * 4597 * @param spec The requirements for this view 4598 * @param padding The padding of this view for the current dimension and 4599 * margins, if applicable 4600 * @param childDimension How big the child wants to be in the current 4601 * dimension 4602 * @return a MeasureSpec integer for the child 4603 */ 4604 public static int getChildMeasureSpec(int spec, int padding, int childDimension) { 4605 int specMode = MeasureSpec.getMode(spec); 4606 int specSize = MeasureSpec.getSize(spec); 4607 4608 int size = Math.max(0, specSize - padding); 4609 4610 int resultSize = 0; 4611 int resultMode = 0; 4612 4613 switch (specMode) { 4614 // Parent has imposed an exact size on us 4615 case MeasureSpec.EXACTLY: 4616 if (childDimension >= 0) { 4617 resultSize = childDimension; 4618 resultMode = MeasureSpec.EXACTLY; 4619 } else if (childDimension == LayoutParams.MATCH_PARENT) { 4620 // Child wants to be our size. So be it. 4621 resultSize = size; 4622 resultMode = MeasureSpec.EXACTLY; 4623 } else if (childDimension == LayoutParams.WRAP_CONTENT) { 4624 // Child wants to determine its own size. It can't be 4625 // bigger than us. 4626 resultSize = size; 4627 resultMode = MeasureSpec.AT_MOST; 4628 } 4629 break; 4630 4631 // Parent has imposed a maximum size on us 4632 case MeasureSpec.AT_MOST: 4633 if (childDimension >= 0) { 4634 // Child wants a specific size... so be it 4635 resultSize = childDimension; 4636 resultMode = MeasureSpec.EXACTLY; 4637 } else if (childDimension == LayoutParams.MATCH_PARENT) { 4638 // Child wants to be our size, but our size is not fixed. 4639 // Constrain child to not be bigger than us. 4640 resultSize = size; 4641 resultMode = MeasureSpec.AT_MOST; 4642 } else if (childDimension == LayoutParams.WRAP_CONTENT) { 4643 // Child wants to determine its own size. It can't be 4644 // bigger than us. 4645 resultSize = size; 4646 resultMode = MeasureSpec.AT_MOST; 4647 } 4648 break; 4649 4650 // Parent asked to see how big we want to be 4651 case MeasureSpec.UNSPECIFIED: 4652 if (childDimension >= 0) { 4653 // Child wants a specific size... let him have it 4654 resultSize = childDimension; 4655 resultMode = MeasureSpec.EXACTLY; 4656 } else if (childDimension == LayoutParams.MATCH_PARENT) { 4657 // Child wants to be our size... find out how big it should 4658 // be 4659 resultSize = 0; 4660 resultMode = MeasureSpec.UNSPECIFIED; 4661 } else if (childDimension == LayoutParams.WRAP_CONTENT) { 4662 // Child wants to determine its own size.... find out how 4663 // big it should be 4664 resultSize = 0; 4665 resultMode = MeasureSpec.UNSPECIFIED; 4666 } 4667 break; 4668 } 4669 return MeasureSpec.makeMeasureSpec(resultSize, resultMode); 4670 } 4671 4672 4673 /** 4674 * Removes any pending animations for views that have been removed. Call 4675 * this if you don't want animations for exiting views to stack up. 4676 */ 4677 public void clearDisappearingChildren() { 4678 if (mDisappearingChildren != null) { 4679 mDisappearingChildren.clear(); 4680 } 4681 } 4682 4683 /** 4684 * Add a view which is removed from mChildren but still needs animation 4685 * 4686 * @param v View to add 4687 */ 4688 private void addDisappearingView(View v) { 4689 ArrayList<View> disappearingChildren = mDisappearingChildren; 4690 4691 if (disappearingChildren == null) { 4692 disappearingChildren = mDisappearingChildren = new ArrayList<View>(); 4693 } 4694 4695 disappearingChildren.add(v); 4696 } 4697 4698 /** 4699 * Cleanup a view when its animation is done. This may mean removing it from 4700 * the list of disappearing views. 4701 * 4702 * @param view The view whose animation has finished 4703 * @param animation The animation, cannot be null 4704 */ 4705 private void finishAnimatingView(final View view, Animation animation) { 4706 final ArrayList<View> disappearingChildren = mDisappearingChildren; 4707 if (disappearingChildren != null) { 4708 if (disappearingChildren.contains(view)) { 4709 disappearingChildren.remove(view); 4710 4711 if (view.mAttachInfo != null) { 4712 view.dispatchDetachedFromWindow(); 4713 } 4714 4715 view.clearAnimation(); 4716 mGroupFlags |= FLAG_INVALIDATE_REQUIRED; 4717 } 4718 } 4719 4720 if (animation != null && !animation.getFillAfter()) { 4721 view.clearAnimation(); 4722 } 4723 4724 if ((view.mPrivateFlags & ANIMATION_STARTED) == ANIMATION_STARTED) { 4725 view.onAnimationEnd(); 4726 // Should be performed by onAnimationEnd() but this avoid an infinite loop, 4727 // so we'd rather be safe than sorry 4728 view.mPrivateFlags &= ~ANIMATION_STARTED; 4729 // Draw one more frame after the animation is done 4730 mGroupFlags |= FLAG_INVALIDATE_REQUIRED; 4731 } 4732 } 4733 4734 /** 4735 * This method tells the ViewGroup that the given View object, which should have this 4736 * ViewGroup as its parent, 4737 * should be kept around (re-displayed when the ViewGroup draws its children) even if it 4738 * is removed from its parent. This allows animations, such as those used by 4739 * {@link android.app.Fragment} and {@link android.animation.LayoutTransition} to animate 4740 * the removal of views. A call to this method should always be accompanied by a later call 4741 * to {@link #endViewTransition(View)}, such as after an animation on the View has finished, 4742 * so that the View finally gets removed. 4743 * 4744 * @param view The View object to be kept visible even if it gets removed from its parent. 4745 */ 4746 public void startViewTransition(View view) { 4747 if (view.mParent == this) { 4748 if (mTransitioningViews == null) { 4749 mTransitioningViews = new ArrayList<View>(); 4750 } 4751 mTransitioningViews.add(view); 4752 } 4753 } 4754 4755 /** 4756 * This method should always be called following an earlier call to 4757 * {@link #startViewTransition(View)}. The given View is finally removed from its parent 4758 * and will no longer be displayed. Note that this method does not perform the functionality 4759 * of removing a view from its parent; it just discontinues the display of a View that 4760 * has previously been removed. 4761 * 4762 * @return view The View object that has been removed but is being kept around in the visible 4763 * hierarchy by an earlier call to {@link #startViewTransition(View)}. 4764 */ 4765 public void endViewTransition(View view) { 4766 if (mTransitioningViews != null) { 4767 mTransitioningViews.remove(view); 4768 final ArrayList<View> disappearingChildren = mDisappearingChildren; 4769 if (disappearingChildren != null && disappearingChildren.contains(view)) { 4770 disappearingChildren.remove(view); 4771 if (mVisibilityChangingChildren != null && 4772 mVisibilityChangingChildren.contains(view)) { 4773 mVisibilityChangingChildren.remove(view); 4774 } else { 4775 if (view.mAttachInfo != null) { 4776 view.dispatchDetachedFromWindow(); 4777 } 4778 if (view.mParent != null) { 4779 view.mParent = null; 4780 } 4781 } 4782 mGroupFlags |= FLAG_INVALIDATE_REQUIRED; 4783 } 4784 } 4785 } 4786 4787 private LayoutTransition.TransitionListener mLayoutTransitionListener = 4788 new LayoutTransition.TransitionListener() { 4789 @Override 4790 public void startTransition(LayoutTransition transition, ViewGroup container, 4791 View view, int transitionType) { 4792 // We only care about disappearing items, since we need special logic to keep 4793 // those items visible after they've been 'removed' 4794 if (transitionType == LayoutTransition.DISAPPEARING) { 4795 startViewTransition(view); 4796 } 4797 } 4798 4799 @Override 4800 public void endTransition(LayoutTransition transition, ViewGroup container, 4801 View view, int transitionType) { 4802 if (mLayoutSuppressed && !transition.isChangingLayout()) { 4803 requestLayout(); 4804 mLayoutSuppressed = false; 4805 } 4806 if (transitionType == LayoutTransition.DISAPPEARING && mTransitioningViews != null) { 4807 endViewTransition(view); 4808 } 4809 } 4810 }; 4811 4812 /** 4813 * {@inheritDoc} 4814 */ 4815 @Override 4816 public boolean gatherTransparentRegion(Region region) { 4817 // If no transparent regions requested, we are always opaque. 4818 final boolean meOpaque = (mPrivateFlags & View.REQUEST_TRANSPARENT_REGIONS) == 0; 4819 if (meOpaque && region == null) { 4820 // The caller doesn't care about the region, so stop now. 4821 return true; 4822 } 4823 super.gatherTransparentRegion(region); 4824 final View[] children = mChildren; 4825 final int count = mChildrenCount; 4826 boolean noneOfTheChildrenAreTransparent = true; 4827 for (int i = 0; i < count; i++) { 4828 final View child = children[i]; 4829 if ((child.mViewFlags & VISIBILITY_MASK) == VISIBLE || child.getAnimation() != null) { 4830 if (!child.gatherTransparentRegion(region)) { 4831 noneOfTheChildrenAreTransparent = false; 4832 } 4833 } 4834 } 4835 return meOpaque || noneOfTheChildrenAreTransparent; 4836 } 4837 4838 /** 4839 * {@inheritDoc} 4840 */ 4841 public void requestTransparentRegion(View child) { 4842 if (child != null) { 4843 child.mPrivateFlags |= View.REQUEST_TRANSPARENT_REGIONS; 4844 if (mParent != null) { 4845 mParent.requestTransparentRegion(this); 4846 } 4847 } 4848 } 4849 4850 4851 @Override 4852 protected boolean fitSystemWindows(Rect insets) { 4853 boolean done = super.fitSystemWindows(insets); 4854 if (!done) { 4855 final int count = mChildrenCount; 4856 final View[] children = mChildren; 4857 for (int i = 0; i < count; i++) { 4858 done = children[i].fitSystemWindows(insets); 4859 if (done) { 4860 break; 4861 } 4862 } 4863 } 4864 return done; 4865 } 4866 4867 /** 4868 * Returns the animation listener to which layout animation events are 4869 * sent. 4870 * 4871 * @return an {@link android.view.animation.Animation.AnimationListener} 4872 */ 4873 public Animation.AnimationListener getLayoutAnimationListener() { 4874 return mAnimationListener; 4875 } 4876 4877 @Override 4878 protected void drawableStateChanged() { 4879 super.drawableStateChanged(); 4880 4881 if ((mGroupFlags & FLAG_NOTIFY_CHILDREN_ON_DRAWABLE_STATE_CHANGE) != 0) { 4882 if ((mGroupFlags & FLAG_ADD_STATES_FROM_CHILDREN) != 0) { 4883 throw new IllegalStateException("addStateFromChildren cannot be enabled if a" 4884 + " child has duplicateParentState set to true"); 4885 } 4886 4887 final View[] children = mChildren; 4888 final int count = mChildrenCount; 4889 4890 for (int i = 0; i < count; i++) { 4891 final View child = children[i]; 4892 if ((child.mViewFlags & DUPLICATE_PARENT_STATE) != 0) { 4893 child.refreshDrawableState(); 4894 } 4895 } 4896 } 4897 } 4898 4899 @Override 4900 public void jumpDrawablesToCurrentState() { 4901 super.jumpDrawablesToCurrentState(); 4902 final View[] children = mChildren; 4903 final int count = mChildrenCount; 4904 for (int i = 0; i < count; i++) { 4905 children[i].jumpDrawablesToCurrentState(); 4906 } 4907 } 4908 4909 @Override 4910 protected int[] onCreateDrawableState(int extraSpace) { 4911 if ((mGroupFlags & FLAG_ADD_STATES_FROM_CHILDREN) == 0) { 4912 return super.onCreateDrawableState(extraSpace); 4913 } 4914 4915 int need = 0; 4916 int n = getChildCount(); 4917 for (int i = 0; i < n; i++) { 4918 int[] childState = getChildAt(i).getDrawableState(); 4919 4920 if (childState != null) { 4921 need += childState.length; 4922 } 4923 } 4924 4925 int[] state = super.onCreateDrawableState(extraSpace + need); 4926 4927 for (int i = 0; i < n; i++) { 4928 int[] childState = getChildAt(i).getDrawableState(); 4929 4930 if (childState != null) { 4931 state = mergeDrawableStates(state, childState); 4932 } 4933 } 4934 4935 return state; 4936 } 4937 4938 /** 4939 * Sets whether this ViewGroup's drawable states also include 4940 * its children's drawable states. This is used, for example, to 4941 * make a group appear to be focused when its child EditText or button 4942 * is focused. 4943 */ 4944 public void setAddStatesFromChildren(boolean addsStates) { 4945 if (addsStates) { 4946 mGroupFlags |= FLAG_ADD_STATES_FROM_CHILDREN; 4947 } else { 4948 mGroupFlags &= ~FLAG_ADD_STATES_FROM_CHILDREN; 4949 } 4950 4951 refreshDrawableState(); 4952 } 4953 4954 /** 4955 * Returns whether this ViewGroup's drawable states also include 4956 * its children's drawable states. This is used, for example, to 4957 * make a group appear to be focused when its child EditText or button 4958 * is focused. 4959 */ 4960 public boolean addStatesFromChildren() { 4961 return (mGroupFlags & FLAG_ADD_STATES_FROM_CHILDREN) != 0; 4962 } 4963 4964 /** 4965 * If {link #addStatesFromChildren} is true, refreshes this group's 4966 * drawable state (to include the states from its children). 4967 */ 4968 public void childDrawableStateChanged(View child) { 4969 if ((mGroupFlags & FLAG_ADD_STATES_FROM_CHILDREN) != 0) { 4970 refreshDrawableState(); 4971 } 4972 } 4973 4974 /** 4975 * Specifies the animation listener to which layout animation events must 4976 * be sent. Only 4977 * {@link android.view.animation.Animation.AnimationListener#onAnimationStart(Animation)} 4978 * and 4979 * {@link android.view.animation.Animation.AnimationListener#onAnimationEnd(Animation)} 4980 * are invoked. 4981 * 4982 * @param animationListener the layout animation listener 4983 */ 4984 public void setLayoutAnimationListener(Animation.AnimationListener animationListener) { 4985 mAnimationListener = animationListener; 4986 } 4987 4988 /** 4989 * This method is called by LayoutTransition when there are 'changing' animations that need 4990 * to start after the layout/setup phase. The request is forwarded to the ViewAncestor, who 4991 * starts all pending transitions prior to the drawing phase in the current traversal. 4992 * 4993 * @param transition The LayoutTransition to be started on the next traversal. 4994 * 4995 * @hide 4996 */ 4997 public void requestTransitionStart(LayoutTransition transition) { 4998 ViewRootImpl viewAncestor = getViewRootImpl(); 4999 viewAncestor.requestTransitionStart(transition); 5000 } 5001 5002 @Override 5003 protected void resetResolvedLayoutDirection() { 5004 super.resetResolvedLayoutDirection(); 5005 5006 // Take care of resetting the children resolution too 5007 final int count = getChildCount(); 5008 for (int i = 0; i < count; i++) { 5009 final View child = getChildAt(i); 5010 if (child.getLayoutDirection() == LAYOUT_DIRECTION_INHERIT) { 5011 child.resetResolvedLayoutDirection(); 5012 } 5013 } 5014 } 5015 5016 @Override 5017 protected void resetResolvedTextDirection() { 5018 super.resetResolvedTextDirection(); 5019 5020 // Take care of resetting the children resolution too 5021 final int count = getChildCount(); 5022 for (int i = 0; i < count; i++) { 5023 final View child = getChildAt(i); 5024 if (child.getTextDirection() == TEXT_DIRECTION_INHERIT) { 5025 child.resetResolvedTextDirection(); 5026 } 5027 } 5028 } 5029 5030 /** 5031 * Return true if the pressed state should be delayed for children or descendants of this 5032 * ViewGroup. Generally, this should be done for containers that can scroll, such as a List. 5033 * This prevents the pressed state from appearing when the user is actually trying to scroll 5034 * the content. 5035 * 5036 * The default implementation returns true for compatibility reasons. Subclasses that do 5037 * not scroll should generally override this method and return false. 5038 */ 5039 public boolean shouldDelayChildPressedState() { 5040 return true; 5041 } 5042 5043 /** 5044 * LayoutParams are used by views to tell their parents how they want to be 5045 * laid out. See 5046 * {@link android.R.styleable#ViewGroup_Layout ViewGroup Layout Attributes} 5047 * for a list of all child view attributes that this class supports. 5048 * 5049 * <p> 5050 * The base LayoutParams class just describes how big the view wants to be 5051 * for both width and height. For each dimension, it can specify one of: 5052 * <ul> 5053 * <li>FILL_PARENT (renamed MATCH_PARENT in API Level 8 and higher), which 5054 * means that the view wants to be as big as its parent (minus padding) 5055 * <li> WRAP_CONTENT, which means that the view wants to be just big enough 5056 * to enclose its content (plus padding) 5057 * <li> an exact number 5058 * </ul> 5059 * There are subclasses of LayoutParams for different subclasses of 5060 * ViewGroup. For example, AbsoluteLayout has its own subclass of 5061 * LayoutParams which adds an X and Y value. 5062 * 5063 * @attr ref android.R.styleable#ViewGroup_Layout_layout_height 5064 * @attr ref android.R.styleable#ViewGroup_Layout_layout_width 5065 */ 5066 public static class LayoutParams { 5067 /** 5068 * Special value for the height or width requested by a View. 5069 * FILL_PARENT means that the view wants to be as big as its parent, 5070 * minus the parent's padding, if any. This value is deprecated 5071 * starting in API Level 8 and replaced by {@link #MATCH_PARENT}. 5072 */ 5073 @SuppressWarnings({"UnusedDeclaration"}) 5074 @Deprecated 5075 public static final int FILL_PARENT = -1; 5076 5077 /** 5078 * Special value for the height or width requested by a View. 5079 * MATCH_PARENT means that the view wants to be as big as its parent, 5080 * minus the parent's padding, if any. Introduced in API Level 8. 5081 */ 5082 public static final int MATCH_PARENT = -1; 5083 5084 /** 5085 * Special value for the height or width requested by a View. 5086 * WRAP_CONTENT means that the view wants to be just large enough to fit 5087 * its own internal content, taking its own padding into account. 5088 */ 5089 public static final int WRAP_CONTENT = -2; 5090 5091 /** 5092 * Information about how wide the view wants to be. Can be one of the 5093 * constants FILL_PARENT (replaced by MATCH_PARENT , 5094 * in API Level 8) or WRAP_CONTENT. or an exact size. 5095 */ 5096 @ViewDebug.ExportedProperty(category = "layout", mapping = { 5097 @ViewDebug.IntToString(from = MATCH_PARENT, to = "MATCH_PARENT"), 5098 @ViewDebug.IntToString(from = WRAP_CONTENT, to = "WRAP_CONTENT") 5099 }) 5100 public int width; 5101 5102 /** 5103 * Information about how tall the view wants to be. Can be one of the 5104 * constants FILL_PARENT (replaced by MATCH_PARENT , 5105 * in API Level 8) or WRAP_CONTENT. or an exact size. 5106 */ 5107 @ViewDebug.ExportedProperty(category = "layout", mapping = { 5108 @ViewDebug.IntToString(from = MATCH_PARENT, to = "MATCH_PARENT"), 5109 @ViewDebug.IntToString(from = WRAP_CONTENT, to = "WRAP_CONTENT") 5110 }) 5111 public int height; 5112 5113 /** 5114 * Used to animate layouts. 5115 */ 5116 public LayoutAnimationController.AnimationParameters layoutAnimationParameters; 5117 5118 /** 5119 * Creates a new set of layout parameters. The values are extracted from 5120 * the supplied attributes set and context. The XML attributes mapped 5121 * to this set of layout parameters are: 5122 * 5123 * <ul> 5124 * <li><code>layout_width</code>: the width, either an exact value, 5125 * {@link #WRAP_CONTENT}, or {@link #FILL_PARENT} (replaced by 5126 * {@link #MATCH_PARENT} in API Level 8)</li> 5127 * <li><code>layout_height</code>: the height, either an exact value, 5128 * {@link #WRAP_CONTENT}, or {@link #FILL_PARENT} (replaced by 5129 * {@link #MATCH_PARENT} in API Level 8)</li> 5130 * </ul> 5131 * 5132 * @param c the application environment 5133 * @param attrs the set of attributes from which to extract the layout 5134 * parameters' values 5135 */ 5136 public LayoutParams(Context c, AttributeSet attrs) { 5137 TypedArray a = c.obtainStyledAttributes(attrs, R.styleable.ViewGroup_Layout); 5138 setBaseAttributes(a, 5139 R.styleable.ViewGroup_Layout_layout_width, 5140 R.styleable.ViewGroup_Layout_layout_height); 5141 a.recycle(); 5142 } 5143 5144 /** 5145 * Creates a new set of layout parameters with the specified width 5146 * and height. 5147 * 5148 * @param width the width, either {@link #WRAP_CONTENT}, 5149 * {@link #FILL_PARENT} (replaced by {@link #MATCH_PARENT} in 5150 * API Level 8), or a fixed size in pixels 5151 * @param height the height, either {@link #WRAP_CONTENT}, 5152 * {@link #FILL_PARENT} (replaced by {@link #MATCH_PARENT} in 5153 * API Level 8), or a fixed size in pixels 5154 */ 5155 public LayoutParams(int width, int height) { 5156 this.width = width; 5157 this.height = height; 5158 } 5159 5160 /** 5161 * Copy constructor. Clones the width and height values of the source. 5162 * 5163 * @param source The layout params to copy from. 5164 */ 5165 public LayoutParams(LayoutParams source) { 5166 this.width = source.width; 5167 this.height = source.height; 5168 } 5169 5170 /** 5171 * Used internally by MarginLayoutParams. 5172 * @hide 5173 */ 5174 LayoutParams() { 5175 } 5176 5177 /** 5178 * Extracts the layout parameters from the supplied attributes. 5179 * 5180 * @param a the style attributes to extract the parameters from 5181 * @param widthAttr the identifier of the width attribute 5182 * @param heightAttr the identifier of the height attribute 5183 */ 5184 protected void setBaseAttributes(TypedArray a, int widthAttr, int heightAttr) { 5185 width = a.getLayoutDimension(widthAttr, "layout_width"); 5186 height = a.getLayoutDimension(heightAttr, "layout_height"); 5187 } 5188 5189 /** 5190 * Resolve layout parameters depending on the layout direction. Subclasses that care about 5191 * layoutDirection changes should override this method. The default implementation does 5192 * nothing. 5193 * 5194 * @param layoutDirection the direction of the layout 5195 * 5196 * {@link View#LAYOUT_DIRECTION_LTR} 5197 * {@link View#LAYOUT_DIRECTION_RTL} 5198 * 5199 * @hide 5200 */ 5201 protected void resolveWithDirection(int layoutDirection) { 5202 } 5203 5204 /** 5205 * Returns a String representation of this set of layout parameters. 5206 * 5207 * @param output the String to prepend to the internal representation 5208 * @return a String with the following format: output + 5209 * "ViewGroup.LayoutParams={ width=WIDTH, height=HEIGHT }" 5210 * 5211 * @hide 5212 */ 5213 public String debug(String output) { 5214 return output + "ViewGroup.LayoutParams={ width=" 5215 + sizeToString(width) + ", height=" + sizeToString(height) + " }"; 5216 } 5217 5218 /** 5219 * Converts the specified size to a readable String. 5220 * 5221 * @param size the size to convert 5222 * @return a String instance representing the supplied size 5223 * 5224 * @hide 5225 */ 5226 protected static String sizeToString(int size) { 5227 if (size == WRAP_CONTENT) { 5228 return "wrap-content"; 5229 } 5230 if (size == MATCH_PARENT) { 5231 return "match-parent"; 5232 } 5233 return String.valueOf(size); 5234 } 5235 } 5236 5237 /** 5238 * Per-child layout information for layouts that support margins. 5239 * See 5240 * {@link android.R.styleable#ViewGroup_MarginLayout ViewGroup Margin Layout Attributes} 5241 * for a list of all child view attributes that this class supports. 5242 */ 5243 public static class MarginLayoutParams extends ViewGroup.LayoutParams { 5244 /** 5245 * The left margin in pixels of the child. Whenever this value is changed, a call to 5246 * {@link android.view.View#requestLayout()} needs to be done. 5247 */ 5248 @ViewDebug.ExportedProperty(category = "layout") 5249 public int leftMargin; 5250 5251 /** 5252 * The top margin in pixels of the child. Whenever this value is changed, a call to 5253 * {@link android.view.View#requestLayout()} needs to be done. 5254 */ 5255 @ViewDebug.ExportedProperty(category = "layout") 5256 public int topMargin; 5257 5258 /** 5259 * The right margin in pixels of the child. Whenever this value is changed, a call to 5260 * {@link android.view.View#requestLayout()} needs to be done. 5261 */ 5262 @ViewDebug.ExportedProperty(category = "layout") 5263 public int rightMargin; 5264 5265 /** 5266 * The bottom margin in pixels of the child. Whenever this value is changed, a call to 5267 * {@link android.view.View#requestLayout()} needs to be done. 5268 */ 5269 @ViewDebug.ExportedProperty(category = "layout") 5270 public int bottomMargin; 5271 5272 /** 5273 * The start margin in pixels of the child. 5274 * 5275 * @hide 5276 * 5277 */ 5278 @ViewDebug.ExportedProperty(category = "layout") 5279 protected int startMargin = DEFAULT_RELATIVE; 5280 5281 /** 5282 * The end margin in pixels of the child. 5283 * 5284 * @hide 5285 */ 5286 @ViewDebug.ExportedProperty(category = "layout") 5287 protected int endMargin = DEFAULT_RELATIVE; 5288 5289 /** 5290 * The default start and end margin. 5291 */ 5292 static private final int DEFAULT_RELATIVE = Integer.MIN_VALUE; 5293 5294 /** 5295 * Creates a new set of layout parameters. The values are extracted from 5296 * the supplied attributes set and context. 5297 * 5298 * @param c the application environment 5299 * @param attrs the set of attributes from which to extract the layout 5300 * parameters' values 5301 */ 5302 public MarginLayoutParams(Context c, AttributeSet attrs) { 5303 super(); 5304 5305 TypedArray a = c.obtainStyledAttributes(attrs, R.styleable.ViewGroup_MarginLayout); 5306 setBaseAttributes(a, 5307 R.styleable.ViewGroup_MarginLayout_layout_width, 5308 R.styleable.ViewGroup_MarginLayout_layout_height); 5309 5310 int margin = a.getDimensionPixelSize( 5311 com.android.internal.R.styleable.ViewGroup_MarginLayout_layout_margin, -1); 5312 if (margin >= 0) { 5313 leftMargin = margin; 5314 topMargin = margin; 5315 rightMargin= margin; 5316 bottomMargin = margin; 5317 } else { 5318 leftMargin = a.getDimensionPixelSize( 5319 R.styleable.ViewGroup_MarginLayout_layout_marginLeft, 0); 5320 topMargin = a.getDimensionPixelSize( 5321 R.styleable.ViewGroup_MarginLayout_layout_marginTop, 0); 5322 rightMargin = a.getDimensionPixelSize( 5323 R.styleable.ViewGroup_MarginLayout_layout_marginRight, 0); 5324 bottomMargin = a.getDimensionPixelSize( 5325 R.styleable.ViewGroup_MarginLayout_layout_marginBottom, 0); 5326 startMargin = a.getDimensionPixelSize( 5327 R.styleable.ViewGroup_MarginLayout_layout_marginStart, DEFAULT_RELATIVE); 5328 endMargin = a.getDimensionPixelSize( 5329 R.styleable.ViewGroup_MarginLayout_layout_marginEnd, DEFAULT_RELATIVE); 5330 } 5331 5332 a.recycle(); 5333 } 5334 5335 /** 5336 * {@inheritDoc} 5337 */ 5338 public MarginLayoutParams(int width, int height) { 5339 super(width, height); 5340 } 5341 5342 /** 5343 * Copy constructor. Clones the width, height and margin values of the source. 5344 * 5345 * @param source The layout params to copy from. 5346 */ 5347 public MarginLayoutParams(MarginLayoutParams source) { 5348 this.width = source.width; 5349 this.height = source.height; 5350 5351 this.leftMargin = source.leftMargin; 5352 this.topMargin = source.topMargin; 5353 this.rightMargin = source.rightMargin; 5354 this.bottomMargin = source.bottomMargin; 5355 this.startMargin = source.startMargin; 5356 this.endMargin = source.endMargin; 5357 } 5358 5359 /** 5360 * {@inheritDoc} 5361 */ 5362 public MarginLayoutParams(LayoutParams source) { 5363 super(source); 5364 } 5365 5366 /** 5367 * Sets the margins, in pixels. A call to {@link android.view.View#requestLayout()} needs 5368 * to be done so that the new margins are taken into account. Left and right margins may be 5369 * overriden by {@link android.view.View#requestLayout()} depending on layout direction. 5370 * 5371 * @param left the left margin size 5372 * @param top the top margin size 5373 * @param right the right margin size 5374 * @param bottom the bottom margin size 5375 * 5376 * @attr ref android.R.styleable#ViewGroup_MarginLayout_layout_marginLeft 5377 * @attr ref android.R.styleable#ViewGroup_MarginLayout_layout_marginTop 5378 * @attr ref android.R.styleable#ViewGroup_MarginLayout_layout_marginRight 5379 * @attr ref android.R.styleable#ViewGroup_MarginLayout_layout_marginBottom 5380 */ 5381 public void setMargins(int left, int top, int right, int bottom) { 5382 leftMargin = left; 5383 topMargin = top; 5384 rightMargin = right; 5385 bottomMargin = bottom; 5386 } 5387 5388 /** 5389 * Sets the relative margins, in pixels. A call to {@link android.view.View#requestLayout()} 5390 * needs to be done so that the new relative margins are taken into account. Left and right 5391 * margins may be overriden by {@link android.view.View#requestLayout()} depending on layout 5392 * direction. 5393 * 5394 * @param start the start margin size 5395 * @param top the top margin size 5396 * @param end the right margin size 5397 * @param bottom the bottom margin size 5398 * 5399 * @attr ref android.R.styleable#ViewGroup_MarginLayout_layout_marginStart 5400 * @attr ref android.R.styleable#ViewGroup_MarginLayout_layout_marginTop 5401 * @attr ref android.R.styleable#ViewGroup_MarginLayout_layout_marginEnd 5402 * @attr ref android.R.styleable#ViewGroup_MarginLayout_layout_marginBottom 5403 * 5404 * @hide 5405 */ 5406 public void setMarginsRelative(int start, int top, int end, int bottom) { 5407 startMargin = start; 5408 topMargin = top; 5409 endMargin = end; 5410 bottomMargin = bottom; 5411 } 5412 5413 /** 5414 * Returns the start margin in pixels. 5415 * 5416 * @attr ref android.R.styleable#ViewGroup_MarginLayout_layout_marginStart 5417 * 5418 * @return the start margin in pixels. 5419 * 5420 * @hide 5421 */ 5422 public int getMarginStart() { 5423 return startMargin; 5424 } 5425 5426 /** 5427 * Returns the end margin in pixels. 5428 * 5429 * @attr ref android.R.styleable#ViewGroup_MarginLayout_layout_marginEnd 5430 * 5431 * @return the end margin in pixels. 5432 * 5433 * @hide 5434 */ 5435 public int getMarginEnd() { 5436 return endMargin; 5437 } 5438 5439 /** 5440 * Check if margins are relative. 5441 * 5442 * @attr ref android.R.styleable#ViewGroup_MarginLayout_layout_marginStart 5443 * @attr ref android.R.styleable#ViewGroup_MarginLayout_layout_marginEnd 5444 * 5445 * @return true if either marginStart or marginEnd has been set 5446 * 5447 * @hide 5448 */ 5449 public boolean isMarginRelative() { 5450 return (startMargin != DEFAULT_RELATIVE) || (endMargin != DEFAULT_RELATIVE); 5451 } 5452 5453 /** 5454 * This will be called by {@link android.view.View#requestLayout()}. Left and Right margins 5455 * maybe overriden depending on layout direction. 5456 * 5457 * @hide 5458 */ 5459 @Override 5460 protected void resolveWithDirection(int layoutDirection) { 5461 switch(layoutDirection) { 5462 case View.LAYOUT_DIRECTION_RTL: 5463 leftMargin = (endMargin > DEFAULT_RELATIVE) ? endMargin : leftMargin; 5464 rightMargin = (startMargin > DEFAULT_RELATIVE) ? startMargin : rightMargin; 5465 break; 5466 case View.LAYOUT_DIRECTION_LTR: 5467 default: 5468 leftMargin = (startMargin > DEFAULT_RELATIVE) ? startMargin : leftMargin; 5469 rightMargin = (endMargin > DEFAULT_RELATIVE) ? endMargin : rightMargin; 5470 break; 5471 } 5472 } 5473 } 5474 5475 /* Describes a touched view and the ids of the pointers that it has captured. 5476 * 5477 * This code assumes that pointer ids are always in the range 0..31 such that 5478 * it can use a bitfield to track which pointer ids are present. 5479 * As it happens, the lower layers of the input dispatch pipeline also use the 5480 * same trick so the assumption should be safe here... 5481 */ 5482 private static final class TouchTarget { 5483 private static final int MAX_RECYCLED = 32; 5484 private static final Object sRecycleLock = new Object(); 5485 private static TouchTarget sRecycleBin; 5486 private static int sRecycledCount; 5487 5488 public static final int ALL_POINTER_IDS = -1; // all ones 5489 5490 // The touched child view. 5491 public View child; 5492 5493 // The combined bit mask of pointer ids for all pointers captured by the target. 5494 public int pointerIdBits; 5495 5496 // The next target in the target list. 5497 public TouchTarget next; 5498 5499 private TouchTarget() { 5500 } 5501 5502 public static TouchTarget obtain(View child, int pointerIdBits) { 5503 final TouchTarget target; 5504 synchronized (sRecycleLock) { 5505 if (sRecycleBin == null) { 5506 target = new TouchTarget(); 5507 } else { 5508 target = sRecycleBin; 5509 sRecycleBin = target.next; 5510 sRecycledCount--; 5511 target.next = null; 5512 } 5513 } 5514 target.child = child; 5515 target.pointerIdBits = pointerIdBits; 5516 return target; 5517 } 5518 5519 public void recycle() { 5520 synchronized (sRecycleLock) { 5521 if (sRecycledCount < MAX_RECYCLED) { 5522 next = sRecycleBin; 5523 sRecycleBin = this; 5524 sRecycledCount += 1; 5525 } else { 5526 next = null; 5527 } 5528 child = null; 5529 } 5530 } 5531 } 5532 5533 /* Describes a hovered view. */ 5534 private static final class HoverTarget { 5535 private static final int MAX_RECYCLED = 32; 5536 private static final Object sRecycleLock = new Object(); 5537 private static HoverTarget sRecycleBin; 5538 private static int sRecycledCount; 5539 5540 // The hovered child view. 5541 public View child; 5542 5543 // The next target in the target list. 5544 public HoverTarget next; 5545 5546 private HoverTarget() { 5547 } 5548 5549 public static HoverTarget obtain(View child) { 5550 final HoverTarget target; 5551 synchronized (sRecycleLock) { 5552 if (sRecycleBin == null) { 5553 target = new HoverTarget(); 5554 } else { 5555 target = sRecycleBin; 5556 sRecycleBin = target.next; 5557 sRecycledCount--; 5558 target.next = null; 5559 } 5560 } 5561 target.child = child; 5562 return target; 5563 } 5564 5565 public void recycle() { 5566 synchronized (sRecycleLock) { 5567 if (sRecycledCount < MAX_RECYCLED) { 5568 next = sRecycleBin; 5569 sRecycleBin = this; 5570 sRecycledCount += 1; 5571 } else { 5572 next = null; 5573 } 5574 child = null; 5575 } 5576 } 5577 } 5578} 5579