ViewGroup.java revision ea83503e8683531fac2534047e50bc1e5979b6dd
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.Animation; 40import android.view.animation.AnimationUtils; 41import android.view.animation.LayoutAnimationController; 42import android.view.animation.Transformation; 43 44import com.android.internal.R; 45import com.android.internal.util.Predicate; 46 47import java.util.ArrayList; 48import java.util.HashSet; 49 50/** 51 * <p> 52 * A <code>ViewGroup</code> is a special view that can contain other views 53 * (called children.) The view group is the base class for layouts and views 54 * containers. This class also defines the 55 * {@link android.view.ViewGroup.LayoutParams} class which serves as the base 56 * class for layouts parameters. 57 * </p> 58 * 59 * <p> 60 * Also see {@link LayoutParams} for layout attributes. 61 * </p> 62 * 63 * @attr ref android.R.styleable#ViewGroup_clipChildren 64 * @attr ref android.R.styleable#ViewGroup_clipToPadding 65 * @attr ref android.R.styleable#ViewGroup_layoutAnimation 66 * @attr ref android.R.styleable#ViewGroup_animationCache 67 * @attr ref android.R.styleable#ViewGroup_persistentDrawingCache 68 * @attr ref android.R.styleable#ViewGroup_alwaysDrawnWithCache 69 * @attr ref android.R.styleable#ViewGroup_addStatesFromChildren 70 * @attr ref android.R.styleable#ViewGroup_descendantFocusability 71 * @attr ref android.R.styleable#ViewGroup_animateLayoutChanges 72 */ 73public abstract class ViewGroup extends View implements ViewParent, ViewManager { 74 75 private static final boolean DBG = false; 76 77 /** 78 * Views which have been hidden or removed which need to be animated on 79 * their way out. 80 * This field should be made private, so it is hidden from the SDK. 81 * {@hide} 82 */ 83 protected ArrayList<View> mDisappearingChildren; 84 85 /** 86 * Listener used to propagate events indicating when children are added 87 * and/or removed from a view group. 88 * This field should be made private, so it is hidden from the SDK. 89 * {@hide} 90 */ 91 protected OnHierarchyChangeListener mOnHierarchyChangeListener; 92 93 // The view contained within this ViewGroup that has or contains focus. 94 private View mFocused; 95 96 /** 97 * A Transformation used when drawing children, to 98 * apply on the child being drawn. 99 */ 100 private final Transformation mChildTransformation = new Transformation(); 101 102 /** 103 * Used to track the current invalidation region. 104 */ 105 private RectF mInvalidateRegion; 106 107 /** 108 * A Transformation used to calculate a correct 109 * invalidation area when the application is autoscaled. 110 */ 111 private Transformation mInvalidationTransformation; 112 113 // View currently under an ongoing drag 114 private View mCurrentDragView; 115 116 // Metadata about the ongoing drag 117 private DragEvent mCurrentDrag; 118 private HashSet<View> mDragNotifiedChildren; 119 120 // Does this group have a child that can accept the current drag payload? 121 private boolean mChildAcceptsDrag; 122 123 // Used during drag dispatch 124 private final PointF mLocalPoint = new PointF(); 125 126 // Layout animation 127 private LayoutAnimationController mLayoutAnimationController; 128 private Animation.AnimationListener mAnimationListener; 129 130 // First touch target in the linked list of touch targets. 131 private TouchTarget mFirstTouchTarget; 132 133 // For debugging only. You can see these in hierarchyviewer. 134 @SuppressWarnings({"FieldCanBeLocal", "UnusedDeclaration"}) 135 @ViewDebug.ExportedProperty(category = "events") 136 private long mLastTouchDownTime; 137 @ViewDebug.ExportedProperty(category = "events") 138 private int mLastTouchDownIndex = -1; 139 @SuppressWarnings({"FieldCanBeLocal", "UnusedDeclaration"}) 140 @ViewDebug.ExportedProperty(category = "events") 141 private float mLastTouchDownX; 142 @SuppressWarnings({"FieldCanBeLocal", "UnusedDeclaration"}) 143 @ViewDebug.ExportedProperty(category = "events") 144 private float mLastTouchDownY; 145 146 // First hover target in the linked list of hover targets. 147 // The hover targets are children which have received ACTION_HOVER_ENTER. 148 // They might not have actually handled the hover event, but we will 149 // continue sending hover events to them as long as the pointer remains over 150 // their bounds and the view group does not intercept hover. 151 private HoverTarget mFirstHoverTarget; 152 153 // True if the view group itself received a hover event. 154 // It might not have actually handled the hover event. 155 private boolean mHoveredSelf; 156 157 /** 158 * Internal flags. 159 * 160 * This field should be made private, so it is hidden from the SDK. 161 * {@hide} 162 */ 163 protected int mGroupFlags; 164 165 // When set, ViewGroup invalidates only the child's rectangle 166 // Set by default 167 private static final int FLAG_CLIP_CHILDREN = 0x1; 168 169 // When set, ViewGroup excludes the padding area from the invalidate rectangle 170 // Set by default 171 private static final int FLAG_CLIP_TO_PADDING = 0x2; 172 173 // When set, dispatchDraw() will invoke invalidate(); this is set by drawChild() when 174 // a child needs to be invalidated and FLAG_OPTIMIZE_INVALIDATE is set 175 private static final int FLAG_INVALIDATE_REQUIRED = 0x4; 176 177 // When set, dispatchDraw() will run the layout animation and unset the flag 178 private static final int FLAG_RUN_ANIMATION = 0x8; 179 180 // When set, there is either no layout animation on the ViewGroup or the layout 181 // animation is over 182 // Set by default 183 private static final int FLAG_ANIMATION_DONE = 0x10; 184 185 // If set, this ViewGroup has padding; if unset there is no padding and we don't need 186 // to clip it, even if FLAG_CLIP_TO_PADDING is set 187 private static final int FLAG_PADDING_NOT_NULL = 0x20; 188 189 // When set, this ViewGroup caches its children in a Bitmap before starting a layout animation 190 // Set by default 191 private static final int FLAG_ANIMATION_CACHE = 0x40; 192 193 // When set, this ViewGroup converts calls to invalidate(Rect) to invalidate() during a 194 // layout animation; this avoid clobbering the hierarchy 195 // Automatically set when the layout animation starts, depending on the animation's 196 // characteristics 197 private static final int FLAG_OPTIMIZE_INVALIDATE = 0x80; 198 199 // When set, the next call to drawChild() will clear mChildTransformation's matrix 200 private static final int FLAG_CLEAR_TRANSFORMATION = 0x100; 201 202 // When set, this ViewGroup invokes mAnimationListener.onAnimationEnd() and removes 203 // the children's Bitmap caches if necessary 204 // This flag is set when the layout animation is over (after FLAG_ANIMATION_DONE is set) 205 private static final int FLAG_NOTIFY_ANIMATION_LISTENER = 0x200; 206 207 /** 208 * When set, the drawing method will call {@link #getChildDrawingOrder(int, int)} 209 * to get the index of the child to draw for that iteration. 210 * 211 * @hide 212 */ 213 protected static final int FLAG_USE_CHILD_DRAWING_ORDER = 0x400; 214 215 /** 216 * When set, this ViewGroup supports static transformations on children; this causes 217 * {@link #getChildStaticTransformation(View, android.view.animation.Transformation)} to be 218 * invoked when a child is drawn. 219 * 220 * Any subclass overriding 221 * {@link #getChildStaticTransformation(View, android.view.animation.Transformation)} should 222 * set this flags in {@link #mGroupFlags}. 223 * 224 * {@hide} 225 */ 226 protected static final int FLAG_SUPPORT_STATIC_TRANSFORMATIONS = 0x800; 227 228 // When the previous drawChild() invocation used an alpha value that was lower than 229 // 1.0 and set it in mCachePaint 230 private static final int FLAG_ALPHA_LOWER_THAN_ONE = 0x1000; 231 232 /** 233 * When set, this ViewGroup's drawable states also include those 234 * of its children. 235 */ 236 private static final int FLAG_ADD_STATES_FROM_CHILDREN = 0x2000; 237 238 /** 239 * When set, this ViewGroup tries to always draw its children using their drawing cache. 240 */ 241 private static final int FLAG_ALWAYS_DRAWN_WITH_CACHE = 0x4000; 242 243 /** 244 * When set, and if FLAG_ALWAYS_DRAWN_WITH_CACHE is not set, this ViewGroup will try to 245 * draw its children with their drawing cache. 246 */ 247 private static final int FLAG_CHILDREN_DRAWN_WITH_CACHE = 0x8000; 248 249 /** 250 * When set, this group will go through its list of children to notify them of 251 * any drawable state change. 252 */ 253 private static final int FLAG_NOTIFY_CHILDREN_ON_DRAWABLE_STATE_CHANGE = 0x10000; 254 255 private static final int FLAG_MASK_FOCUSABILITY = 0x60000; 256 257 /** 258 * This view will get focus before any of its descendants. 259 */ 260 public static final int FOCUS_BEFORE_DESCENDANTS = 0x20000; 261 262 /** 263 * This view will get focus only if none of its descendants want it. 264 */ 265 public static final int FOCUS_AFTER_DESCENDANTS = 0x40000; 266 267 /** 268 * This view will block any of its descendants from getting focus, even 269 * if they are focusable. 270 */ 271 public static final int FOCUS_BLOCK_DESCENDANTS = 0x60000; 272 273 /** 274 * Used to map between enum in attrubutes and flag values. 275 */ 276 private static final int[] DESCENDANT_FOCUSABILITY_FLAGS = 277 {FOCUS_BEFORE_DESCENDANTS, FOCUS_AFTER_DESCENDANTS, 278 FOCUS_BLOCK_DESCENDANTS}; 279 280 /** 281 * When set, this ViewGroup should not intercept touch events. 282 * {@hide} 283 */ 284 protected static final int FLAG_DISALLOW_INTERCEPT = 0x80000; 285 286 /** 287 * When set, this ViewGroup will split MotionEvents to multiple child Views when appropriate. 288 */ 289 private static final int FLAG_SPLIT_MOTION_EVENTS = 0x200000; 290 291 /** 292 * Indicates which types of drawing caches are to be kept in memory. 293 * This field should be made private, so it is hidden from the SDK. 294 * {@hide} 295 */ 296 protected int mPersistentDrawingCache; 297 298 /** 299 * Used to indicate that no drawing cache should be kept in memory. 300 */ 301 public static final int PERSISTENT_NO_CACHE = 0x0; 302 303 /** 304 * Used to indicate that the animation drawing cache should be kept in memory. 305 */ 306 public static final int PERSISTENT_ANIMATION_CACHE = 0x1; 307 308 /** 309 * Used to indicate that the scrolling drawing cache should be kept in memory. 310 */ 311 public static final int PERSISTENT_SCROLLING_CACHE = 0x2; 312 313 /** 314 * Used to indicate that all drawing caches should be kept in memory. 315 */ 316 public static final int PERSISTENT_ALL_CACHES = 0x3; 317 318 /** 319 * We clip to padding when FLAG_CLIP_TO_PADDING and FLAG_PADDING_NOT_NULL 320 * are set at the same time. 321 */ 322 protected static final int CLIP_TO_PADDING_MASK = FLAG_CLIP_TO_PADDING | FLAG_PADDING_NOT_NULL; 323 324 // Index of the child's left position in the mLocation array 325 private static final int CHILD_LEFT_INDEX = 0; 326 // Index of the child's top position in the mLocation array 327 private static final int CHILD_TOP_INDEX = 1; 328 329 // Child views of this ViewGroup 330 private View[] mChildren; 331 // Number of valid children in the mChildren array, the rest should be null or not 332 // considered as children 333 334 private boolean mLayoutSuppressed = false; 335 336 private int mChildrenCount; 337 338 private static final int ARRAY_INITIAL_CAPACITY = 12; 339 private static final int ARRAY_CAPACITY_INCREMENT = 12; 340 341 // Used to draw cached views 342 private final Paint mCachePaint = new Paint(); 343 344 // Used to animate add/remove changes in layout 345 private LayoutTransition mTransition; 346 347 // The set of views that are currently being transitioned. This list is used to track views 348 // being removed that should not actually be removed from the parent yet because they are 349 // being animated. 350 private ArrayList<View> mTransitioningViews; 351 352 // List of children changing visibility. This is used to potentially keep rendering 353 // views during a transition when they otherwise would have become gone/invisible 354 private ArrayList<View> mVisibilityChangingChildren; 355 356 // Indicates whether this container will use its children layers to draw 357 @ViewDebug.ExportedProperty(category = "drawing") 358 private boolean mDrawLayers = true; 359 360 public ViewGroup(Context context) { 361 super(context); 362 initViewGroup(); 363 } 364 365 public ViewGroup(Context context, AttributeSet attrs) { 366 super(context, attrs); 367 initViewGroup(); 368 initFromAttributes(context, attrs); 369 } 370 371 public ViewGroup(Context context, AttributeSet attrs, int defStyle) { 372 super(context, attrs, defStyle); 373 initViewGroup(); 374 initFromAttributes(context, attrs); 375 } 376 377 private void initViewGroup() { 378 // ViewGroup doesn't draw by default 379 setFlags(WILL_NOT_DRAW, DRAW_MASK); 380 mGroupFlags |= FLAG_CLIP_CHILDREN; 381 mGroupFlags |= FLAG_CLIP_TO_PADDING; 382 mGroupFlags |= FLAG_ANIMATION_DONE; 383 mGroupFlags |= FLAG_ANIMATION_CACHE; 384 mGroupFlags |= FLAG_ALWAYS_DRAWN_WITH_CACHE; 385 386 if (mContext.getApplicationInfo().targetSdkVersion >= Build.VERSION_CODES.HONEYCOMB) { 387 mGroupFlags |= FLAG_SPLIT_MOTION_EVENTS; 388 } 389 390 setDescendantFocusability(FOCUS_BEFORE_DESCENDANTS); 391 392 mChildren = new View[ARRAY_INITIAL_CAPACITY]; 393 mChildrenCount = 0; 394 395 mCachePaint.setDither(false); 396 397 mPersistentDrawingCache = PERSISTENT_SCROLLING_CACHE; 398 } 399 400 private void initFromAttributes(Context context, AttributeSet attrs) { 401 TypedArray a = context.obtainStyledAttributes(attrs, 402 R.styleable.ViewGroup); 403 404 final int N = a.getIndexCount(); 405 for (int i = 0; i < N; i++) { 406 int attr = a.getIndex(i); 407 switch (attr) { 408 case R.styleable.ViewGroup_clipChildren: 409 setClipChildren(a.getBoolean(attr, true)); 410 break; 411 case R.styleable.ViewGroup_clipToPadding: 412 setClipToPadding(a.getBoolean(attr, true)); 413 break; 414 case R.styleable.ViewGroup_animationCache: 415 setAnimationCacheEnabled(a.getBoolean(attr, true)); 416 break; 417 case R.styleable.ViewGroup_persistentDrawingCache: 418 setPersistentDrawingCache(a.getInt(attr, PERSISTENT_SCROLLING_CACHE)); 419 break; 420 case R.styleable.ViewGroup_addStatesFromChildren: 421 setAddStatesFromChildren(a.getBoolean(attr, false)); 422 break; 423 case R.styleable.ViewGroup_alwaysDrawnWithCache: 424 setAlwaysDrawnWithCacheEnabled(a.getBoolean(attr, true)); 425 break; 426 case R.styleable.ViewGroup_layoutAnimation: 427 int id = a.getResourceId(attr, -1); 428 if (id > 0) { 429 setLayoutAnimation(AnimationUtils.loadLayoutAnimation(mContext, id)); 430 } 431 break; 432 case R.styleable.ViewGroup_descendantFocusability: 433 setDescendantFocusability(DESCENDANT_FOCUSABILITY_FLAGS[a.getInt(attr, 0)]); 434 break; 435 case R.styleable.ViewGroup_splitMotionEvents: 436 setMotionEventSplittingEnabled(a.getBoolean(attr, false)); 437 break; 438 case R.styleable.ViewGroup_animateLayoutChanges: 439 boolean animateLayoutChanges = a.getBoolean(attr, false); 440 if (animateLayoutChanges) { 441 setLayoutTransition(new LayoutTransition()); 442 } 443 break; 444 } 445 } 446 447 a.recycle(); 448 } 449 450 /** 451 * Gets the descendant focusability of this view group. The descendant 452 * focusability defines the relationship between this view group and its 453 * descendants when looking for a view to take focus in 454 * {@link #requestFocus(int, android.graphics.Rect)}. 455 * 456 * @return one of {@link #FOCUS_BEFORE_DESCENDANTS}, {@link #FOCUS_AFTER_DESCENDANTS}, 457 * {@link #FOCUS_BLOCK_DESCENDANTS}. 458 */ 459 @ViewDebug.ExportedProperty(category = "focus", mapping = { 460 @ViewDebug.IntToString(from = FOCUS_BEFORE_DESCENDANTS, to = "FOCUS_BEFORE_DESCENDANTS"), 461 @ViewDebug.IntToString(from = FOCUS_AFTER_DESCENDANTS, to = "FOCUS_AFTER_DESCENDANTS"), 462 @ViewDebug.IntToString(from = FOCUS_BLOCK_DESCENDANTS, to = "FOCUS_BLOCK_DESCENDANTS") 463 }) 464 public int getDescendantFocusability() { 465 return mGroupFlags & FLAG_MASK_FOCUSABILITY; 466 } 467 468 /** 469 * Set the descendant focusability of this view group. This defines the relationship 470 * between this view group and its descendants when looking for a view to 471 * take focus in {@link #requestFocus(int, android.graphics.Rect)}. 472 * 473 * @param focusability one of {@link #FOCUS_BEFORE_DESCENDANTS}, {@link #FOCUS_AFTER_DESCENDANTS}, 474 * {@link #FOCUS_BLOCK_DESCENDANTS}. 475 */ 476 public void setDescendantFocusability(int focusability) { 477 switch (focusability) { 478 case FOCUS_BEFORE_DESCENDANTS: 479 case FOCUS_AFTER_DESCENDANTS: 480 case FOCUS_BLOCK_DESCENDANTS: 481 break; 482 default: 483 throw new IllegalArgumentException("must be one of FOCUS_BEFORE_DESCENDANTS, " 484 + "FOCUS_AFTER_DESCENDANTS, FOCUS_BLOCK_DESCENDANTS"); 485 } 486 mGroupFlags &= ~FLAG_MASK_FOCUSABILITY; 487 mGroupFlags |= (focusability & FLAG_MASK_FOCUSABILITY); 488 } 489 490 /** 491 * {@inheritDoc} 492 */ 493 @Override 494 void handleFocusGainInternal(int direction, Rect previouslyFocusedRect) { 495 if (mFocused != null) { 496 mFocused.unFocus(); 497 mFocused = null; 498 } 499 super.handleFocusGainInternal(direction, previouslyFocusedRect); 500 } 501 502 /** 503 * {@inheritDoc} 504 */ 505 public void requestChildFocus(View child, View focused) { 506 if (DBG) { 507 System.out.println(this + " requestChildFocus()"); 508 } 509 if (getDescendantFocusability() == FOCUS_BLOCK_DESCENDANTS) { 510 return; 511 } 512 513 // Unfocus us, if necessary 514 super.unFocus(); 515 516 // We had a previous notion of who had focus. Clear it. 517 if (mFocused != child) { 518 if (mFocused != null) { 519 mFocused.unFocus(); 520 } 521 522 mFocused = child; 523 } 524 if (mParent != null) { 525 mParent.requestChildFocus(this, focused); 526 } 527 } 528 529 /** 530 * {@inheritDoc} 531 */ 532 public void focusableViewAvailable(View v) { 533 if (mParent != null 534 // shortcut: don't report a new focusable view if we block our descendants from 535 // getting focus 536 && (getDescendantFocusability() != FOCUS_BLOCK_DESCENDANTS) 537 // shortcut: don't report a new focusable view if we already are focused 538 // (and we don't prefer our descendants) 539 // 540 // note: knowing that mFocused is non-null is not a good enough reason 541 // to break the traversal since in that case we'd actually have to find 542 // the focused view and make sure it wasn't FOCUS_AFTER_DESCENDANTS and 543 // an ancestor of v; this will get checked for at ViewAncestor 544 && !(isFocused() && getDescendantFocusability() != FOCUS_AFTER_DESCENDANTS)) { 545 mParent.focusableViewAvailable(v); 546 } 547 } 548 549 /** 550 * {@inheritDoc} 551 */ 552 public boolean showContextMenuForChild(View originalView) { 553 return mParent != null && mParent.showContextMenuForChild(originalView); 554 } 555 556 /** 557 * {@inheritDoc} 558 */ 559 public ActionMode startActionModeForChild(View originalView, ActionMode.Callback callback) { 560 return mParent != null ? mParent.startActionModeForChild(originalView, callback) : null; 561 } 562 563 /** 564 * Find the nearest view in the specified direction that wants to take 565 * focus. 566 * 567 * @param focused The view that currently has focus 568 * @param direction One of FOCUS_UP, FOCUS_DOWN, FOCUS_LEFT, and 569 * FOCUS_RIGHT, or 0 for not applicable. 570 */ 571 public View focusSearch(View focused, int direction) { 572 if (isRootNamespace()) { 573 // root namespace means we should consider ourselves the top of the 574 // tree for focus searching; otherwise we could be focus searching 575 // into other tabs. see LocalActivityManager and TabHost for more info 576 return FocusFinder.getInstance().findNextFocus(this, focused, direction); 577 } else if (mParent != null) { 578 return mParent.focusSearch(focused, direction); 579 } 580 return null; 581 } 582 583 /** 584 * {@inheritDoc} 585 */ 586 public boolean requestChildRectangleOnScreen(View child, Rect rectangle, boolean immediate) { 587 return false; 588 } 589 590 /** 591 * {@inheritDoc} 592 */ 593 public boolean requestSendAccessibilityEvent(View child, AccessibilityEvent event) { 594 ViewParent parent = getParent(); 595 if (parent == null) { 596 return false; 597 } 598 final boolean propagate = onRequestSendAccessibilityEvent(child, event); 599 //noinspection SimplifiableIfStatement 600 if (!propagate) { 601 return false; 602 } 603 return parent.requestSendAccessibilityEvent(this, event); 604 } 605 606 /** 607 * Called when a child has requested sending an {@link AccessibilityEvent} and 608 * gives an opportunity to its parent to augment the event. 609 * 610 * @param child The child which requests sending the event. 611 * @param event The event to be sent. 612 * @return True if the event should be sent. 613 * 614 * @see #requestSendAccessibilityEvent(View, AccessibilityEvent) 615 */ 616 public boolean onRequestSendAccessibilityEvent(View child, AccessibilityEvent event) { 617 return true; 618 } 619 620 /** 621 * {@inheritDoc} 622 */ 623 @Override 624 public boolean dispatchUnhandledMove(View focused, int direction) { 625 return mFocused != null && 626 mFocused.dispatchUnhandledMove(focused, direction); 627 } 628 629 /** 630 * {@inheritDoc} 631 */ 632 public void clearChildFocus(View child) { 633 if (DBG) { 634 System.out.println(this + " clearChildFocus()"); 635 } 636 637 mFocused = null; 638 if (mParent != null) { 639 mParent.clearChildFocus(this); 640 } 641 } 642 643 /** 644 * {@inheritDoc} 645 */ 646 @Override 647 public void clearFocus() { 648 super.clearFocus(); 649 650 // clear any child focus if it exists 651 if (mFocused != null) { 652 mFocused.clearFocus(); 653 } 654 } 655 656 /** 657 * {@inheritDoc} 658 */ 659 @Override 660 void unFocus() { 661 if (DBG) { 662 System.out.println(this + " unFocus()"); 663 } 664 665 super.unFocus(); 666 if (mFocused != null) { 667 mFocused.unFocus(); 668 } 669 mFocused = null; 670 } 671 672 /** 673 * Returns the focused child of this view, if any. The child may have focus 674 * or contain focus. 675 * 676 * @return the focused child or null. 677 */ 678 public View getFocusedChild() { 679 return mFocused; 680 } 681 682 /** 683 * Returns true if this view has or contains focus 684 * 685 * @return true if this view has or contains focus 686 */ 687 @Override 688 public boolean hasFocus() { 689 return (mPrivateFlags & FOCUSED) != 0 || mFocused != null; 690 } 691 692 /* 693 * (non-Javadoc) 694 * 695 * @see android.view.View#findFocus() 696 */ 697 @Override 698 public View findFocus() { 699 if (DBG) { 700 System.out.println("Find focus in " + this + ": flags=" 701 + isFocused() + ", child=" + mFocused); 702 } 703 704 if (isFocused()) { 705 return this; 706 } 707 708 if (mFocused != null) { 709 return mFocused.findFocus(); 710 } 711 return null; 712 } 713 714 /** 715 * {@inheritDoc} 716 */ 717 @Override 718 public boolean hasFocusable() { 719 if ((mViewFlags & VISIBILITY_MASK) != VISIBLE) { 720 return false; 721 } 722 723 if (isFocusable()) { 724 return true; 725 } 726 727 final int descendantFocusability = getDescendantFocusability(); 728 if (descendantFocusability != FOCUS_BLOCK_DESCENDANTS) { 729 final int count = mChildrenCount; 730 final View[] children = mChildren; 731 732 for (int i = 0; i < count; i++) { 733 final View child = children[i]; 734 if (child.hasFocusable()) { 735 return true; 736 } 737 } 738 } 739 740 return false; 741 } 742 743 /** 744 * {@inheritDoc} 745 */ 746 @Override 747 public void addFocusables(ArrayList<View> views, int direction) { 748 addFocusables(views, direction, FOCUSABLES_TOUCH_MODE); 749 } 750 751 /** 752 * {@inheritDoc} 753 */ 754 @Override 755 public void addFocusables(ArrayList<View> views, int direction, int focusableMode) { 756 final int focusableCount = views.size(); 757 758 final int descendantFocusability = getDescendantFocusability(); 759 760 if (descendantFocusability != FOCUS_BLOCK_DESCENDANTS) { 761 final int count = mChildrenCount; 762 final View[] children = mChildren; 763 764 for (int i = 0; i < count; i++) { 765 final View child = children[i]; 766 if ((child.mViewFlags & VISIBILITY_MASK) == VISIBLE) { 767 child.addFocusables(views, direction, focusableMode); 768 } 769 } 770 } 771 772 // we add ourselves (if focusable) in all cases except for when we are 773 // FOCUS_AFTER_DESCENDANTS and there are some descendants focusable. this is 774 // to avoid the focus search finding layouts when a more precise search 775 // among the focusable children would be more interesting. 776 if ( 777 descendantFocusability != FOCUS_AFTER_DESCENDANTS || 778 // No focusable descendants 779 (focusableCount == views.size())) { 780 super.addFocusables(views, direction, focusableMode); 781 } 782 } 783 784 @Override 785 public void findViewsWithText(ArrayList<View> outViews, CharSequence text) { 786 final int childrenCount = mChildrenCount; 787 final View[] children = mChildren; 788 for (int i = 0; i < childrenCount; i++) { 789 View child = children[i]; 790 if ((child.mPrivateFlags & IS_ROOT_NAMESPACE) == 0) { 791 child.findViewsWithText(outViews, text); 792 } 793 } 794 } 795 796 /** 797 * {@inheritDoc} 798 */ 799 @Override 800 public void dispatchWindowFocusChanged(boolean hasFocus) { 801 super.dispatchWindowFocusChanged(hasFocus); 802 final int count = mChildrenCount; 803 final View[] children = mChildren; 804 for (int i = 0; i < count; i++) { 805 children[i].dispatchWindowFocusChanged(hasFocus); 806 } 807 } 808 809 /** 810 * {@inheritDoc} 811 */ 812 @Override 813 public void addTouchables(ArrayList<View> views) { 814 super.addTouchables(views); 815 816 final int count = mChildrenCount; 817 final View[] children = mChildren; 818 819 for (int i = 0; i < count; i++) { 820 final View child = children[i]; 821 if ((child.mViewFlags & VISIBILITY_MASK) == VISIBLE) { 822 child.addTouchables(views); 823 } 824 } 825 } 826 827 /** 828 * {@inheritDoc} 829 */ 830 @Override 831 public void dispatchDisplayHint(int hint) { 832 super.dispatchDisplayHint(hint); 833 final int count = mChildrenCount; 834 final View[] children = mChildren; 835 for (int i = 0; i < count; i++) { 836 children[i].dispatchDisplayHint(hint); 837 } 838 } 839 840 /** 841 * @hide 842 * @param child 843 * @param visibility 844 */ 845 protected void onChildVisibilityChanged(View child, int visibility) { 846 if (mTransition != null) { 847 if (visibility == VISIBLE) { 848 mTransition.showChild(this, child); 849 } else { 850 mTransition.hideChild(this, child); 851 } 852 if (visibility != VISIBLE) { 853 // Only track this on disappearing views - appearing views are already visible 854 // and don't need special handling during drawChild() 855 if (mVisibilityChangingChildren == null) { 856 mVisibilityChangingChildren = new ArrayList<View>(); 857 } 858 mVisibilityChangingChildren.add(child); 859 if (mTransitioningViews != null && mTransitioningViews.contains(child)) { 860 addDisappearingView(child); 861 } 862 } 863 } 864 865 // in all cases, for drags 866 if (mCurrentDrag != null) { 867 if (visibility == VISIBLE) { 868 notifyChildOfDrag(child); 869 } 870 } 871 } 872 873 /** 874 * {@inheritDoc} 875 */ 876 @Override 877 protected void dispatchVisibilityChanged(View changedView, int visibility) { 878 super.dispatchVisibilityChanged(changedView, visibility); 879 final int count = mChildrenCount; 880 final View[] children = mChildren; 881 for (int i = 0; i < count; i++) { 882 children[i].dispatchVisibilityChanged(changedView, visibility); 883 } 884 } 885 886 /** 887 * {@inheritDoc} 888 */ 889 @Override 890 public void dispatchWindowVisibilityChanged(int visibility) { 891 super.dispatchWindowVisibilityChanged(visibility); 892 final int count = mChildrenCount; 893 final View[] children = mChildren; 894 for (int i = 0; i < count; i++) { 895 children[i].dispatchWindowVisibilityChanged(visibility); 896 } 897 } 898 899 /** 900 * {@inheritDoc} 901 */ 902 @Override 903 public void dispatchConfigurationChanged(Configuration newConfig) { 904 super.dispatchConfigurationChanged(newConfig); 905 final int count = mChildrenCount; 906 final View[] children = mChildren; 907 for (int i = 0; i < count; i++) { 908 children[i].dispatchConfigurationChanged(newConfig); 909 } 910 } 911 912 /** 913 * {@inheritDoc} 914 */ 915 public void recomputeViewAttributes(View child) { 916 if (mAttachInfo != null && !mAttachInfo.mRecomputeGlobalAttributes) { 917 ViewParent parent = mParent; 918 if (parent != null) parent.recomputeViewAttributes(this); 919 } 920 } 921 922 @Override 923 void dispatchCollectViewAttributes(int visibility) { 924 visibility |= mViewFlags&VISIBILITY_MASK; 925 super.dispatchCollectViewAttributes(visibility); 926 final int count = mChildrenCount; 927 final View[] children = mChildren; 928 for (int i = 0; i < count; i++) { 929 children[i].dispatchCollectViewAttributes(visibility); 930 } 931 } 932 933 /** 934 * {@inheritDoc} 935 */ 936 public void bringChildToFront(View child) { 937 int index = indexOfChild(child); 938 if (index >= 0) { 939 removeFromArray(index); 940 addInArray(child, mChildrenCount); 941 child.mParent = this; 942 } 943 } 944 945 /** 946 * {@inheritDoc} 947 * 948 * !!! TODO: write real docs 949 */ 950 @Override 951 public boolean dispatchDragEvent(DragEvent event) { 952 boolean retval = false; 953 final float tx = event.mX; 954 final float ty = event.mY; 955 956 ViewRootImpl root = getViewRootImpl(); 957 958 // Dispatch down the view hierarchy 959 switch (event.mAction) { 960 case DragEvent.ACTION_DRAG_STARTED: { 961 // clear state to recalculate which views we drag over 962 mCurrentDragView = null; 963 964 // Set up our tracking of drag-started notifications 965 mCurrentDrag = DragEvent.obtain(event); 966 if (mDragNotifiedChildren == null) { 967 mDragNotifiedChildren = new HashSet<View>(); 968 } else { 969 mDragNotifiedChildren.clear(); 970 } 971 972 // Now dispatch down to our children, caching the responses 973 mChildAcceptsDrag = false; 974 final int count = mChildrenCount; 975 final View[] children = mChildren; 976 for (int i = 0; i < count; i++) { 977 final View child = children[i]; 978 child.mPrivateFlags2 &= ~View.DRAG_MASK; 979 if (child.getVisibility() == VISIBLE) { 980 final boolean handled = notifyChildOfDrag(children[i]); 981 if (handled) { 982 mChildAcceptsDrag = true; 983 } 984 } 985 } 986 987 // Return HANDLED if one of our children can accept the drag 988 if (mChildAcceptsDrag) { 989 retval = true; 990 } 991 } break; 992 993 case DragEvent.ACTION_DRAG_ENDED: { 994 // Release the bookkeeping now that the drag lifecycle has ended 995 if (mDragNotifiedChildren != null) { 996 for (View child : mDragNotifiedChildren) { 997 // If a child was notified about an ongoing drag, it's told that it's over 998 child.dispatchDragEvent(event); 999 child.mPrivateFlags2 &= ~View.DRAG_MASK; 1000 child.refreshDrawableState(); 1001 } 1002 1003 mDragNotifiedChildren.clear(); 1004 mCurrentDrag.recycle(); 1005 mCurrentDrag = null; 1006 } 1007 1008 // We consider drag-ended to have been handled if one of our children 1009 // had offered to handle the drag. 1010 if (mChildAcceptsDrag) { 1011 retval = true; 1012 } 1013 } break; 1014 1015 case DragEvent.ACTION_DRAG_LOCATION: { 1016 // Find the [possibly new] drag target 1017 final View target = findFrontmostDroppableChildAt(event.mX, event.mY, mLocalPoint); 1018 1019 // If we've changed apparent drag target, tell the view root which view 1020 // we're over now [for purposes of the eventual drag-recipient-changed 1021 // notifications to the framework] and tell the new target that the drag 1022 // has entered its bounds. The root will see setDragFocus() calls all 1023 // the way down to the final leaf view that is handling the LOCATION event 1024 // before reporting the new potential recipient to the framework. 1025 if (mCurrentDragView != target) { 1026 root.setDragFocus(target); 1027 1028 final int action = event.mAction; 1029 // If we've dragged off of a child view, send it the EXITED message 1030 if (mCurrentDragView != null) { 1031 final View view = mCurrentDragView; 1032 event.mAction = DragEvent.ACTION_DRAG_EXITED; 1033 view.dispatchDragEvent(event); 1034 view.mPrivateFlags2 &= ~View.DRAG_HOVERED; 1035 view.refreshDrawableState(); 1036 } 1037 mCurrentDragView = target; 1038 1039 // If we've dragged over a new child view, send it the ENTERED message 1040 if (target != null) { 1041 event.mAction = DragEvent.ACTION_DRAG_ENTERED; 1042 target.dispatchDragEvent(event); 1043 target.mPrivateFlags2 |= View.DRAG_HOVERED; 1044 target.refreshDrawableState(); 1045 } 1046 event.mAction = action; // restore the event's original state 1047 } 1048 1049 // Dispatch the actual drag location notice, localized into its coordinates 1050 if (target != null) { 1051 event.mX = mLocalPoint.x; 1052 event.mY = mLocalPoint.y; 1053 1054 retval = target.dispatchDragEvent(event); 1055 1056 event.mX = tx; 1057 event.mY = ty; 1058 } 1059 } break; 1060 1061 /* Entered / exited dispatch 1062 * 1063 * DRAG_ENTERED is not dispatched downwards from ViewGroup. The reason for this is 1064 * that we're about to get the corresponding LOCATION event, which we will use to 1065 * determine which of our children is the new target; at that point we will 1066 * push a DRAG_ENTERED down to the new target child [which may itself be a ViewGroup]. 1067 * 1068 * DRAG_EXITED *is* dispatched all the way down immediately: once we know the 1069 * drag has left this ViewGroup, we know by definition that every contained subview 1070 * is also no longer under the drag point. 1071 */ 1072 1073 case DragEvent.ACTION_DRAG_EXITED: { 1074 if (mCurrentDragView != null) { 1075 final View view = mCurrentDragView; 1076 view.dispatchDragEvent(event); 1077 view.mPrivateFlags2 &= ~View.DRAG_HOVERED; 1078 view.refreshDrawableState(); 1079 1080 mCurrentDragView = null; 1081 } 1082 } break; 1083 1084 case DragEvent.ACTION_DROP: { 1085 if (ViewDebug.DEBUG_DRAG) Log.d(View.VIEW_LOG_TAG, "Drop event: " + event); 1086 View target = findFrontmostDroppableChildAt(event.mX, event.mY, mLocalPoint); 1087 if (target != null) { 1088 if (ViewDebug.DEBUG_DRAG) Log.d(View.VIEW_LOG_TAG, " dispatch drop to " + target); 1089 event.mX = mLocalPoint.x; 1090 event.mY = mLocalPoint.y; 1091 retval = target.dispatchDragEvent(event); 1092 event.mX = tx; 1093 event.mY = ty; 1094 } else { 1095 if (ViewDebug.DEBUG_DRAG) { 1096 Log.d(View.VIEW_LOG_TAG, " not dropped on an accepting view"); 1097 } 1098 } 1099 } break; 1100 } 1101 1102 // If none of our children could handle the event, try here 1103 if (!retval) { 1104 // Call up to the View implementation that dispatches to installed listeners 1105 retval = super.dispatchDragEvent(event); 1106 } 1107 return retval; 1108 } 1109 1110 // Find the frontmost child view that lies under the given point, and calculate 1111 // the position within its own local coordinate system. 1112 View findFrontmostDroppableChildAt(float x, float y, PointF outLocalPoint) { 1113 final int count = mChildrenCount; 1114 final View[] children = mChildren; 1115 for (int i = count - 1; i >= 0; i--) { 1116 final View child = children[i]; 1117 if (!child.canAcceptDrag()) { 1118 continue; 1119 } 1120 1121 if (isTransformedTouchPointInView(x, y, child, outLocalPoint)) { 1122 return child; 1123 } 1124 } 1125 return null; 1126 } 1127 1128 boolean notifyChildOfDrag(View child) { 1129 if (ViewDebug.DEBUG_DRAG) { 1130 Log.d(View.VIEW_LOG_TAG, "Sending drag-started to view: " + child); 1131 } 1132 1133 boolean canAccept = false; 1134 if (! mDragNotifiedChildren.contains(child)) { 1135 mDragNotifiedChildren.add(child); 1136 canAccept = child.dispatchDragEvent(mCurrentDrag); 1137 if (canAccept && !child.canAcceptDrag()) { 1138 child.mPrivateFlags2 |= View.DRAG_CAN_ACCEPT; 1139 child.refreshDrawableState(); 1140 } 1141 } 1142 return canAccept; 1143 } 1144 1145 @Override 1146 public void dispatchSystemUiVisibilityChanged(int visible) { 1147 super.dispatchSystemUiVisibilityChanged(visible); 1148 1149 final int count = mChildrenCount; 1150 final View[] children = mChildren; 1151 for (int i=0; i <count; i++) { 1152 final View child = children[i]; 1153 child.dispatchSystemUiVisibilityChanged(visible); 1154 } 1155 } 1156 1157 /** 1158 * {@inheritDoc} 1159 */ 1160 @Override 1161 public boolean dispatchKeyEventPreIme(KeyEvent event) { 1162 if ((mPrivateFlags & (FOCUSED | HAS_BOUNDS)) == (FOCUSED | HAS_BOUNDS)) { 1163 return super.dispatchKeyEventPreIme(event); 1164 } else if (mFocused != null && (mFocused.mPrivateFlags & HAS_BOUNDS) == HAS_BOUNDS) { 1165 return mFocused.dispatchKeyEventPreIme(event); 1166 } 1167 return false; 1168 } 1169 1170 /** 1171 * {@inheritDoc} 1172 */ 1173 @Override 1174 public boolean dispatchKeyEvent(KeyEvent event) { 1175 if (mInputEventConsistencyVerifier != null) { 1176 mInputEventConsistencyVerifier.onKeyEvent(event, 1); 1177 } 1178 1179 if ((mPrivateFlags & (FOCUSED | HAS_BOUNDS)) == (FOCUSED | HAS_BOUNDS)) { 1180 if (super.dispatchKeyEvent(event)) { 1181 return true; 1182 } 1183 } else if (mFocused != null && (mFocused.mPrivateFlags & HAS_BOUNDS) == HAS_BOUNDS) { 1184 if (mFocused.dispatchKeyEvent(event)) { 1185 return true; 1186 } 1187 } 1188 1189 if (mInputEventConsistencyVerifier != null) { 1190 mInputEventConsistencyVerifier.onUnhandledEvent(event, 1); 1191 } 1192 return false; 1193 } 1194 1195 /** 1196 * {@inheritDoc} 1197 */ 1198 @Override 1199 public boolean dispatchKeyShortcutEvent(KeyEvent event) { 1200 if ((mPrivateFlags & (FOCUSED | HAS_BOUNDS)) == (FOCUSED | HAS_BOUNDS)) { 1201 return super.dispatchKeyShortcutEvent(event); 1202 } else if (mFocused != null && (mFocused.mPrivateFlags & HAS_BOUNDS) == HAS_BOUNDS) { 1203 return mFocused.dispatchKeyShortcutEvent(event); 1204 } 1205 return false; 1206 } 1207 1208 /** 1209 * {@inheritDoc} 1210 */ 1211 @Override 1212 public boolean dispatchTrackballEvent(MotionEvent event) { 1213 if (mInputEventConsistencyVerifier != null) { 1214 mInputEventConsistencyVerifier.onTrackballEvent(event, 1); 1215 } 1216 1217 if ((mPrivateFlags & (FOCUSED | HAS_BOUNDS)) == (FOCUSED | HAS_BOUNDS)) { 1218 if (super.dispatchTrackballEvent(event)) { 1219 return true; 1220 } 1221 } else if (mFocused != null && (mFocused.mPrivateFlags & HAS_BOUNDS) == HAS_BOUNDS) { 1222 if (mFocused.dispatchTrackballEvent(event)) { 1223 return true; 1224 } 1225 } 1226 1227 if (mInputEventConsistencyVerifier != null) { 1228 mInputEventConsistencyVerifier.onUnhandledEvent(event, 1); 1229 } 1230 return false; 1231 } 1232 1233 /** 1234 * {@inheritDoc} 1235 */ 1236 @SuppressWarnings({"ConstantConditions"}) 1237 @Override 1238 protected boolean dispatchHoverEvent(MotionEvent event) { 1239 final int action = event.getAction(); 1240 1241 // First check whether the view group wants to intercept the hover event. 1242 final boolean interceptHover = onInterceptHoverEvent(event); 1243 event.setAction(action); // restore action in case it was changed 1244 1245 MotionEvent eventNoHistory = event; 1246 boolean handled = false; 1247 1248 // Send events to the hovered children and build a new list of hover targets until 1249 // one is found that handles the event. 1250 HoverTarget firstOldHoverTarget = mFirstHoverTarget; 1251 mFirstHoverTarget = null; 1252 if (!interceptHover && action != MotionEvent.ACTION_HOVER_EXIT) { 1253 final float x = event.getX(); 1254 final float y = event.getY(); 1255 final int childrenCount = mChildrenCount; 1256 if (childrenCount != 0) { 1257 final View[] children = mChildren; 1258 HoverTarget lastHoverTarget = null; 1259 for (int i = childrenCount - 1; i >= 0; i--) { 1260 final View child = children[i]; 1261 if (!canViewReceivePointerEvents(child) 1262 || !isTransformedTouchPointInView(x, y, child, null)) { 1263 continue; 1264 } 1265 1266 // Obtain a hover target for this child. Dequeue it from the 1267 // old hover target list if the child was previously hovered. 1268 HoverTarget hoverTarget = firstOldHoverTarget; 1269 final boolean wasHovered; 1270 for (HoverTarget predecessor = null; ;) { 1271 if (hoverTarget == null) { 1272 hoverTarget = HoverTarget.obtain(child); 1273 wasHovered = false; 1274 break; 1275 } 1276 1277 if (hoverTarget.child == child) { 1278 if (predecessor != null) { 1279 predecessor.next = hoverTarget.next; 1280 } else { 1281 firstOldHoverTarget = hoverTarget.next; 1282 } 1283 hoverTarget.next = null; 1284 wasHovered = true; 1285 break; 1286 } 1287 1288 predecessor = hoverTarget; 1289 hoverTarget = hoverTarget.next; 1290 } 1291 1292 // Enqueue the hover target onto the new hover target list. 1293 if (lastHoverTarget != null) { 1294 lastHoverTarget.next = hoverTarget; 1295 } else { 1296 lastHoverTarget = hoverTarget; 1297 mFirstHoverTarget = hoverTarget; 1298 } 1299 1300 // Dispatch the event to the child. 1301 if (action == MotionEvent.ACTION_HOVER_ENTER) { 1302 if (!wasHovered) { 1303 // Send the enter as is. 1304 handled |= dispatchTransformedGenericPointerEvent( 1305 event, child); // enter 1306 } 1307 } else if (action == MotionEvent.ACTION_HOVER_MOVE) { 1308 if (!wasHovered) { 1309 // Synthesize an enter from a move. 1310 eventNoHistory = obtainMotionEventNoHistoryOrSelf(eventNoHistory); 1311 eventNoHistory.setAction(MotionEvent.ACTION_HOVER_ENTER); 1312 handled |= dispatchTransformedGenericPointerEvent( 1313 eventNoHistory, child); // enter 1314 eventNoHistory.setAction(action); 1315 1316 handled |= dispatchTransformedGenericPointerEvent( 1317 eventNoHistory, child); // move 1318 } else { 1319 // Send the move as is. 1320 handled |= dispatchTransformedGenericPointerEvent(event, child); 1321 } 1322 } 1323 if (handled) { 1324 break; 1325 } 1326 } 1327 } 1328 } 1329 1330 // Send exit events to all previously hovered children that are no longer hovered. 1331 while (firstOldHoverTarget != null) { 1332 final View child = firstOldHoverTarget.child; 1333 1334 // Exit the old hovered child. 1335 if (action == MotionEvent.ACTION_HOVER_EXIT) { 1336 // Send the exit as is. 1337 handled |= dispatchTransformedGenericPointerEvent( 1338 event, child); // exit 1339 } else { 1340 // Synthesize an exit from a move or enter. 1341 // Ignore the result because hover focus has moved to a different view. 1342 if (action == MotionEvent.ACTION_HOVER_MOVE) { 1343 dispatchTransformedGenericPointerEvent( 1344 event, child); // move 1345 } 1346 eventNoHistory = obtainMotionEventNoHistoryOrSelf(eventNoHistory); 1347 eventNoHistory.setAction(MotionEvent.ACTION_HOVER_EXIT); 1348 dispatchTransformedGenericPointerEvent( 1349 eventNoHistory, child); // exit 1350 eventNoHistory.setAction(action); 1351 } 1352 1353 final HoverTarget nextOldHoverTarget = firstOldHoverTarget.next; 1354 firstOldHoverTarget.recycle(); 1355 firstOldHoverTarget = nextOldHoverTarget; 1356 } 1357 1358 // Send events to the view group itself if no children have handled it. 1359 boolean newHoveredSelf = !handled; 1360 if (newHoveredSelf == mHoveredSelf) { 1361 if (newHoveredSelf) { 1362 // Send event to the view group as before. 1363 handled |= super.dispatchHoverEvent(event); 1364 } 1365 } else { 1366 if (mHoveredSelf) { 1367 // Exit the view group. 1368 if (action == MotionEvent.ACTION_HOVER_EXIT) { 1369 // Send the exit as is. 1370 handled |= super.dispatchHoverEvent(event); // exit 1371 } else { 1372 // Synthesize an exit from a move or enter. 1373 // Ignore the result because hover focus is moving to a different view. 1374 if (action == MotionEvent.ACTION_HOVER_MOVE) { 1375 super.dispatchHoverEvent(event); // move 1376 } 1377 eventNoHistory = obtainMotionEventNoHistoryOrSelf(eventNoHistory); 1378 eventNoHistory.setAction(MotionEvent.ACTION_HOVER_EXIT); 1379 super.dispatchHoverEvent(eventNoHistory); // exit 1380 eventNoHistory.setAction(action); 1381 } 1382 mHoveredSelf = false; 1383 } 1384 1385 if (newHoveredSelf) { 1386 // Enter the view group. 1387 if (action == MotionEvent.ACTION_HOVER_ENTER) { 1388 // Send the enter as is. 1389 handled |= super.dispatchHoverEvent(event); // enter 1390 mHoveredSelf = true; 1391 } else if (action == MotionEvent.ACTION_HOVER_MOVE) { 1392 // Synthesize an enter from a move. 1393 eventNoHistory = obtainMotionEventNoHistoryOrSelf(eventNoHistory); 1394 eventNoHistory.setAction(MotionEvent.ACTION_HOVER_ENTER); 1395 handled |= super.dispatchHoverEvent(eventNoHistory); // enter 1396 eventNoHistory.setAction(action); 1397 1398 handled |= super.dispatchHoverEvent(eventNoHistory); // move 1399 mHoveredSelf = true; 1400 } 1401 } 1402 } 1403 1404 // Recycle the copy of the event that we made. 1405 if (eventNoHistory != event) { 1406 eventNoHistory.recycle(); 1407 } 1408 1409 // Done. 1410 return handled; 1411 } 1412 1413 /** @hide */ 1414 @Override 1415 protected boolean hasHoveredChild() { 1416 return mFirstHoverTarget != null; 1417 } 1418 1419 /** 1420 * Implement this method to intercept hover events before they are handled 1421 * by child views. 1422 * <p> 1423 * This method is called before dispatching a hover event to a child of 1424 * the view group or to the view group's own {@link #onHoverEvent} to allow 1425 * the view group a chance to intercept the hover event. 1426 * This method can also be used to watch all pointer motions that occur within 1427 * the bounds of the view group even when the pointer is hovering over 1428 * a child of the view group rather than over the view group itself. 1429 * </p><p> 1430 * The view group can prevent its children from receiving hover events by 1431 * implementing this method and returning <code>true</code> to indicate 1432 * that it would like to intercept hover events. The view group must 1433 * continuously return <code>true</code> from {@link #onInterceptHoverEvent} 1434 * for as long as it wishes to continue intercepting hover events from 1435 * its children. 1436 * </p><p> 1437 * Interception preserves the invariant that at most one view can be 1438 * hovered at a time by transferring hover focus from the currently hovered 1439 * child to the view group or vice-versa as needed. 1440 * </p><p> 1441 * If this method returns <code>true</code> and a child is already hovered, then the 1442 * child view will first receive a hover exit event and then the view group 1443 * itself will receive a hover enter event in {@link #onHoverEvent}. 1444 * Likewise, if this method had previously returned <code>true</code> to intercept hover 1445 * events and instead returns <code>false</code> while the pointer is hovering 1446 * within the bounds of one of a child, then the view group will first receive a 1447 * hover exit event in {@link #onHoverEvent} and then the hovered child will 1448 * receive a hover enter event. 1449 * </p><p> 1450 * The default implementation always returns false. 1451 * </p> 1452 * 1453 * @param event The motion event that describes the hover. 1454 * @return True if the view group would like to intercept the hover event 1455 * and prevent its children from receiving it. 1456 */ 1457 public boolean onInterceptHoverEvent(MotionEvent event) { 1458 return false; 1459 } 1460 1461 private static MotionEvent obtainMotionEventNoHistoryOrSelf(MotionEvent event) { 1462 if (event.getHistorySize() == 0) { 1463 return event; 1464 } 1465 return MotionEvent.obtainNoHistory(event); 1466 } 1467 1468 /** 1469 * {@inheritDoc} 1470 */ 1471 @Override 1472 protected boolean dispatchGenericPointerEvent(MotionEvent event) { 1473 // Send the event to the child under the pointer. 1474 final int childrenCount = mChildrenCount; 1475 if (childrenCount != 0) { 1476 final View[] children = mChildren; 1477 final float x = event.getX(); 1478 final float y = event.getY(); 1479 1480 for (int i = childrenCount - 1; i >= 0; i--) { 1481 final View child = children[i]; 1482 if (!canViewReceivePointerEvents(child) 1483 || !isTransformedTouchPointInView(x, y, child, null)) { 1484 continue; 1485 } 1486 1487 if (dispatchTransformedGenericPointerEvent(event, child)) { 1488 return true; 1489 } 1490 } 1491 } 1492 1493 // No child handled the event. Send it to this view group. 1494 return super.dispatchGenericPointerEvent(event); 1495 } 1496 1497 /** 1498 * {@inheritDoc} 1499 */ 1500 @Override 1501 protected boolean dispatchGenericFocusedEvent(MotionEvent event) { 1502 // Send the event to the focused child or to this view group if it has focus. 1503 if ((mPrivateFlags & (FOCUSED | HAS_BOUNDS)) == (FOCUSED | HAS_BOUNDS)) { 1504 return super.dispatchGenericFocusedEvent(event); 1505 } else if (mFocused != null && (mFocused.mPrivateFlags & HAS_BOUNDS) == HAS_BOUNDS) { 1506 return mFocused.dispatchGenericMotionEvent(event); 1507 } 1508 return false; 1509 } 1510 1511 /** 1512 * Dispatches a generic pointer event to a child, taking into account 1513 * transformations that apply to the child. 1514 * 1515 * @param event The event to send. 1516 * @param child The view to send the event to. 1517 * @return {@code true} if the child handled the event. 1518 */ 1519 private boolean dispatchTransformedGenericPointerEvent(MotionEvent event, View child) { 1520 final float offsetX = mScrollX - child.mLeft; 1521 final float offsetY = mScrollY - child.mTop; 1522 1523 boolean handled; 1524 if (!child.hasIdentityMatrix()) { 1525 MotionEvent transformedEvent = MotionEvent.obtain(event); 1526 transformedEvent.offsetLocation(offsetX, offsetY); 1527 transformedEvent.transform(child.getInverseMatrix()); 1528 handled = child.dispatchGenericMotionEvent(transformedEvent); 1529 transformedEvent.recycle(); 1530 } else { 1531 event.offsetLocation(offsetX, offsetY); 1532 handled = child.dispatchGenericMotionEvent(event); 1533 event.offsetLocation(-offsetX, -offsetY); 1534 } 1535 return handled; 1536 } 1537 1538 /** 1539 * {@inheritDoc} 1540 */ 1541 @Override 1542 public boolean dispatchTouchEvent(MotionEvent ev) { 1543 if (mInputEventConsistencyVerifier != null) { 1544 mInputEventConsistencyVerifier.onTouchEvent(ev, 1); 1545 } 1546 1547 boolean handled = false; 1548 if (onFilterTouchEventForSecurity(ev)) { 1549 final int action = ev.getAction(); 1550 final int actionMasked = action & MotionEvent.ACTION_MASK; 1551 1552 // Handle an initial down. 1553 if (actionMasked == MotionEvent.ACTION_DOWN) { 1554 // Throw away all previous state when starting a new touch gesture. 1555 // The framework may have dropped the up or cancel event for the previous gesture 1556 // due to an app switch, ANR, or some other state change. 1557 cancelAndClearTouchTargets(ev); 1558 resetTouchState(); 1559 } 1560 1561 // Check for interception. 1562 final boolean intercepted; 1563 if (actionMasked == MotionEvent.ACTION_DOWN 1564 || mFirstTouchTarget != null) { 1565 final boolean disallowIntercept = (mGroupFlags & FLAG_DISALLOW_INTERCEPT) != 0; 1566 if (!disallowIntercept) { 1567 intercepted = onInterceptTouchEvent(ev); 1568 ev.setAction(action); // restore action in case it was changed 1569 } else { 1570 intercepted = false; 1571 } 1572 } else { 1573 // There are no touch targets and this action is not an initial down 1574 // so this view group continues to intercept touches. 1575 intercepted = true; 1576 } 1577 1578 // Check for cancelation. 1579 final boolean canceled = resetCancelNextUpFlag(this) 1580 || actionMasked == MotionEvent.ACTION_CANCEL; 1581 1582 // Update list of touch targets for pointer down, if needed. 1583 final boolean split = (mGroupFlags & FLAG_SPLIT_MOTION_EVENTS) != 0; 1584 TouchTarget newTouchTarget = null; 1585 boolean alreadyDispatchedToNewTouchTarget = false; 1586 if (!canceled && !intercepted) { 1587 if (actionMasked == MotionEvent.ACTION_DOWN 1588 || (split && actionMasked == MotionEvent.ACTION_POINTER_DOWN) 1589 || actionMasked == MotionEvent.ACTION_HOVER_MOVE) { 1590 final int actionIndex = ev.getActionIndex(); // always 0 for down 1591 final int idBitsToAssign = split ? 1 << ev.getPointerId(actionIndex) 1592 : TouchTarget.ALL_POINTER_IDS; 1593 1594 // Clean up earlier touch targets for this pointer id in case they 1595 // have become out of sync. 1596 removePointersFromTouchTargets(idBitsToAssign); 1597 1598 final int childrenCount = mChildrenCount; 1599 if (childrenCount != 0) { 1600 // Find a child that can receive the event. 1601 // Scan children from front to back. 1602 final View[] children = mChildren; 1603 final float x = ev.getX(actionIndex); 1604 final float y = ev.getY(actionIndex); 1605 1606 for (int i = childrenCount - 1; i >= 0; i--) { 1607 final View child = children[i]; 1608 if (!canViewReceivePointerEvents(child) 1609 || !isTransformedTouchPointInView(x, y, child, null)) { 1610 continue; 1611 } 1612 1613 newTouchTarget = getTouchTarget(child); 1614 if (newTouchTarget != null) { 1615 // Child is already receiving touch within its bounds. 1616 // Give it the new pointer in addition to the ones it is handling. 1617 newTouchTarget.pointerIdBits |= idBitsToAssign; 1618 break; 1619 } 1620 1621 resetCancelNextUpFlag(child); 1622 if (dispatchTransformedTouchEvent(ev, false, child, idBitsToAssign)) { 1623 // Child wants to receive touch within its bounds. 1624 mLastTouchDownTime = ev.getDownTime(); 1625 mLastTouchDownIndex = i; 1626 mLastTouchDownX = ev.getX(); 1627 mLastTouchDownY = ev.getY(); 1628 newTouchTarget = addTouchTarget(child, idBitsToAssign); 1629 alreadyDispatchedToNewTouchTarget = true; 1630 break; 1631 } 1632 } 1633 } 1634 1635 if (newTouchTarget == null && mFirstTouchTarget != null) { 1636 // Did not find a child to receive the event. 1637 // Assign the pointer to the least recently added target. 1638 newTouchTarget = mFirstTouchTarget; 1639 while (newTouchTarget.next != null) { 1640 newTouchTarget = newTouchTarget.next; 1641 } 1642 newTouchTarget.pointerIdBits |= idBitsToAssign; 1643 } 1644 } 1645 } 1646 1647 // Dispatch to touch targets. 1648 if (mFirstTouchTarget == null) { 1649 // No touch targets so treat this as an ordinary view. 1650 handled = dispatchTransformedTouchEvent(ev, canceled, null, 1651 TouchTarget.ALL_POINTER_IDS); 1652 } else { 1653 // Dispatch to touch targets, excluding the new touch target if we already 1654 // dispatched to it. Cancel touch targets if necessary. 1655 TouchTarget predecessor = null; 1656 TouchTarget target = mFirstTouchTarget; 1657 while (target != null) { 1658 final TouchTarget next = target.next; 1659 if (alreadyDispatchedToNewTouchTarget && target == newTouchTarget) { 1660 handled = true; 1661 } else { 1662 final boolean cancelChild = resetCancelNextUpFlag(target.child) 1663 || intercepted; 1664 if (dispatchTransformedTouchEvent(ev, cancelChild, 1665 target.child, target.pointerIdBits)) { 1666 handled = true; 1667 } 1668 if (cancelChild) { 1669 if (predecessor == null) { 1670 mFirstTouchTarget = next; 1671 } else { 1672 predecessor.next = next; 1673 } 1674 target.recycle(); 1675 target = next; 1676 continue; 1677 } 1678 } 1679 predecessor = target; 1680 target = next; 1681 } 1682 } 1683 1684 // Update list of touch targets for pointer up or cancel, if needed. 1685 if (canceled 1686 || actionMasked == MotionEvent.ACTION_UP 1687 || actionMasked == MotionEvent.ACTION_HOVER_MOVE) { 1688 resetTouchState(); 1689 } else if (split && actionMasked == MotionEvent.ACTION_POINTER_UP) { 1690 final int actionIndex = ev.getActionIndex(); 1691 final int idBitsToRemove = 1 << ev.getPointerId(actionIndex); 1692 removePointersFromTouchTargets(idBitsToRemove); 1693 } 1694 } 1695 1696 if (!handled && mInputEventConsistencyVerifier != null) { 1697 mInputEventConsistencyVerifier.onUnhandledEvent(ev, 1); 1698 } 1699 return handled; 1700 } 1701 1702 /** 1703 * Resets all touch state in preparation for a new cycle. 1704 */ 1705 private void resetTouchState() { 1706 clearTouchTargets(); 1707 resetCancelNextUpFlag(this); 1708 mGroupFlags &= ~FLAG_DISALLOW_INTERCEPT; 1709 } 1710 1711 /** 1712 * Resets the cancel next up flag. 1713 * Returns true if the flag was previously set. 1714 */ 1715 private boolean resetCancelNextUpFlag(View view) { 1716 if ((view.mPrivateFlags & CANCEL_NEXT_UP_EVENT) != 0) { 1717 view.mPrivateFlags &= ~CANCEL_NEXT_UP_EVENT; 1718 return true; 1719 } 1720 return false; 1721 } 1722 1723 /** 1724 * Clears all touch targets. 1725 */ 1726 private void clearTouchTargets() { 1727 TouchTarget target = mFirstTouchTarget; 1728 if (target != null) { 1729 do { 1730 TouchTarget next = target.next; 1731 target.recycle(); 1732 target = next; 1733 } while (target != null); 1734 mFirstTouchTarget = null; 1735 } 1736 } 1737 1738 /** 1739 * Cancels and clears all touch targets. 1740 */ 1741 private void cancelAndClearTouchTargets(MotionEvent event) { 1742 if (mFirstTouchTarget != null) { 1743 boolean syntheticEvent = false; 1744 if (event == null) { 1745 final long now = SystemClock.uptimeMillis(); 1746 event = MotionEvent.obtain(now, now, 1747 MotionEvent.ACTION_CANCEL, 0.0f, 0.0f, 0); 1748 event.setSource(InputDevice.SOURCE_TOUCHSCREEN); 1749 syntheticEvent = true; 1750 } 1751 1752 for (TouchTarget target = mFirstTouchTarget; target != null; target = target.next) { 1753 resetCancelNextUpFlag(target.child); 1754 dispatchTransformedTouchEvent(event, true, target.child, target.pointerIdBits); 1755 } 1756 clearTouchTargets(); 1757 1758 if (syntheticEvent) { 1759 event.recycle(); 1760 } 1761 } 1762 } 1763 1764 /** 1765 * Gets the touch target for specified child view. 1766 * Returns null if not found. 1767 */ 1768 private TouchTarget getTouchTarget(View child) { 1769 for (TouchTarget target = mFirstTouchTarget; target != null; target = target.next) { 1770 if (target.child == child) { 1771 return target; 1772 } 1773 } 1774 return null; 1775 } 1776 1777 /** 1778 * Adds a touch target for specified child to the beginning of the list. 1779 * Assumes the target child is not already present. 1780 */ 1781 private TouchTarget addTouchTarget(View child, int pointerIdBits) { 1782 TouchTarget target = TouchTarget.obtain(child, pointerIdBits); 1783 target.next = mFirstTouchTarget; 1784 mFirstTouchTarget = target; 1785 return target; 1786 } 1787 1788 /** 1789 * Removes the pointer ids from consideration. 1790 */ 1791 private void removePointersFromTouchTargets(int pointerIdBits) { 1792 TouchTarget predecessor = null; 1793 TouchTarget target = mFirstTouchTarget; 1794 while (target != null) { 1795 final TouchTarget next = target.next; 1796 if ((target.pointerIdBits & pointerIdBits) != 0) { 1797 target.pointerIdBits &= ~pointerIdBits; 1798 if (target.pointerIdBits == 0) { 1799 if (predecessor == null) { 1800 mFirstTouchTarget = next; 1801 } else { 1802 predecessor.next = next; 1803 } 1804 target.recycle(); 1805 target = next; 1806 continue; 1807 } 1808 } 1809 predecessor = target; 1810 target = next; 1811 } 1812 } 1813 1814 /** 1815 * Returns true if a child view can receive pointer events. 1816 * @hide 1817 */ 1818 private static boolean canViewReceivePointerEvents(View child) { 1819 return (child.mViewFlags & VISIBILITY_MASK) == VISIBLE 1820 || child.getAnimation() != null; 1821 } 1822 1823 /** 1824 * Returns true if a child view contains the specified point when transformed 1825 * into its coordinate space. 1826 * Child must not be null. 1827 * @hide 1828 */ 1829 protected boolean isTransformedTouchPointInView(float x, float y, View child, 1830 PointF outLocalPoint) { 1831 float localX = x + mScrollX - child.mLeft; 1832 float localY = y + mScrollY - child.mTop; 1833 if (! child.hasIdentityMatrix() && mAttachInfo != null) { 1834 final float[] localXY = mAttachInfo.mTmpTransformLocation; 1835 localXY[0] = localX; 1836 localXY[1] = localY; 1837 child.getInverseMatrix().mapPoints(localXY); 1838 localX = localXY[0]; 1839 localY = localXY[1]; 1840 } 1841 final boolean isInView = child.pointInView(localX, localY); 1842 if (isInView && outLocalPoint != null) { 1843 outLocalPoint.set(localX, localY); 1844 } 1845 return isInView; 1846 } 1847 1848 /** 1849 * Transforms a motion event into the coordinate space of a particular child view, 1850 * filters out irrelevant pointer ids, and overrides its action if necessary. 1851 * If child is null, assumes the MotionEvent will be sent to this ViewGroup instead. 1852 */ 1853 private boolean dispatchTransformedTouchEvent(MotionEvent event, boolean cancel, 1854 View child, int desiredPointerIdBits) { 1855 final boolean handled; 1856 1857 // Canceling motions is a special case. We don't need to perform any transformations 1858 // or filtering. The important part is the action, not the contents. 1859 final int oldAction = event.getAction(); 1860 if (cancel || oldAction == MotionEvent.ACTION_CANCEL) { 1861 event.setAction(MotionEvent.ACTION_CANCEL); 1862 if (child == null) { 1863 handled = super.dispatchTouchEvent(event); 1864 } else { 1865 handled = child.dispatchTouchEvent(event); 1866 } 1867 event.setAction(oldAction); 1868 return handled; 1869 } 1870 1871 // Calculate the number of pointers to deliver. 1872 final int oldPointerIdBits = event.getPointerIdBits(); 1873 final int newPointerIdBits = oldPointerIdBits & desiredPointerIdBits; 1874 1875 // If for some reason we ended up in an inconsistent state where it looks like we 1876 // might produce a motion event with no pointers in it, then drop the event. 1877 if (newPointerIdBits == 0) { 1878 return false; 1879 } 1880 1881 // If the number of pointers is the same and we don't need to perform any fancy 1882 // irreversible transformations, then we can reuse the motion event for this 1883 // dispatch as long as we are careful to revert any changes we make. 1884 // Otherwise we need to make a copy. 1885 final MotionEvent transformedEvent; 1886 if (newPointerIdBits == oldPointerIdBits) { 1887 if (child == null || child.hasIdentityMatrix()) { 1888 if (child == null) { 1889 handled = super.dispatchTouchEvent(event); 1890 } else { 1891 final float offsetX = mScrollX - child.mLeft; 1892 final float offsetY = mScrollY - child.mTop; 1893 event.offsetLocation(offsetX, offsetY); 1894 1895 handled = child.dispatchTouchEvent(event); 1896 1897 event.offsetLocation(-offsetX, -offsetY); 1898 } 1899 return handled; 1900 } 1901 transformedEvent = MotionEvent.obtain(event); 1902 } else { 1903 transformedEvent = event.split(newPointerIdBits); 1904 } 1905 1906 // Perform any necessary transformations and dispatch. 1907 if (child == null) { 1908 handled = super.dispatchTouchEvent(transformedEvent); 1909 } else { 1910 final float offsetX = mScrollX - child.mLeft; 1911 final float offsetY = mScrollY - child.mTop; 1912 transformedEvent.offsetLocation(offsetX, offsetY); 1913 if (! child.hasIdentityMatrix()) { 1914 transformedEvent.transform(child.getInverseMatrix()); 1915 } 1916 1917 handled = child.dispatchTouchEvent(transformedEvent); 1918 } 1919 1920 // Done. 1921 transformedEvent.recycle(); 1922 return handled; 1923 } 1924 1925 /** 1926 * Enable or disable the splitting of MotionEvents to multiple children during touch event 1927 * dispatch. This behavior is enabled by default for applications that target an 1928 * SDK version of {@link Build.VERSION_CODES#HONEYCOMB} or newer. 1929 * 1930 * <p>When this option is enabled MotionEvents may be split and dispatched to different child 1931 * views depending on where each pointer initially went down. This allows for user interactions 1932 * such as scrolling two panes of content independently, chording of buttons, and performing 1933 * independent gestures on different pieces of content. 1934 * 1935 * @param split <code>true</code> to allow MotionEvents to be split and dispatched to multiple 1936 * child views. <code>false</code> to only allow one child view to be the target of 1937 * any MotionEvent received by this ViewGroup. 1938 */ 1939 public void setMotionEventSplittingEnabled(boolean split) { 1940 // TODO Applications really shouldn't change this setting mid-touch event, 1941 // but perhaps this should handle that case and send ACTION_CANCELs to any child views 1942 // with gestures in progress when this is changed. 1943 if (split) { 1944 mGroupFlags |= FLAG_SPLIT_MOTION_EVENTS; 1945 } else { 1946 mGroupFlags &= ~FLAG_SPLIT_MOTION_EVENTS; 1947 } 1948 } 1949 1950 /** 1951 * Returns true if MotionEvents dispatched to this ViewGroup can be split to multiple children. 1952 * @return true if MotionEvents dispatched to this ViewGroup can be split to multiple children. 1953 */ 1954 public boolean isMotionEventSplittingEnabled() { 1955 return (mGroupFlags & FLAG_SPLIT_MOTION_EVENTS) == FLAG_SPLIT_MOTION_EVENTS; 1956 } 1957 1958 /** 1959 * {@inheritDoc} 1960 */ 1961 public void requestDisallowInterceptTouchEvent(boolean disallowIntercept) { 1962 1963 if (disallowIntercept == ((mGroupFlags & FLAG_DISALLOW_INTERCEPT) != 0)) { 1964 // We're already in this state, assume our ancestors are too 1965 return; 1966 } 1967 1968 if (disallowIntercept) { 1969 mGroupFlags |= FLAG_DISALLOW_INTERCEPT; 1970 } else { 1971 mGroupFlags &= ~FLAG_DISALLOW_INTERCEPT; 1972 } 1973 1974 // Pass it up to our parent 1975 if (mParent != null) { 1976 mParent.requestDisallowInterceptTouchEvent(disallowIntercept); 1977 } 1978 } 1979 1980 /** 1981 * Implement this method to intercept all touch screen motion events. This 1982 * allows you to watch events as they are dispatched to your children, and 1983 * take ownership of the current gesture at any point. 1984 * 1985 * <p>Using this function takes some care, as it has a fairly complicated 1986 * interaction with {@link View#onTouchEvent(MotionEvent) 1987 * View.onTouchEvent(MotionEvent)}, and using it requires implementing 1988 * that method as well as this one in the correct way. Events will be 1989 * received in the following order: 1990 * 1991 * <ol> 1992 * <li> You will receive the down event here. 1993 * <li> The down event will be handled either by a child of this view 1994 * group, or given to your own onTouchEvent() method to handle; this means 1995 * you should implement onTouchEvent() to return true, so you will 1996 * continue to see the rest of the gesture (instead of looking for 1997 * a parent view to handle it). Also, by returning true from 1998 * onTouchEvent(), you will not receive any following 1999 * events in onInterceptTouchEvent() and all touch processing must 2000 * happen in onTouchEvent() like normal. 2001 * <li> For as long as you return false from this function, each following 2002 * event (up to and including the final up) will be delivered first here 2003 * and then to the target's onTouchEvent(). 2004 * <li> If you return true from here, you will not receive any 2005 * following events: the target view will receive the same event but 2006 * with the action {@link MotionEvent#ACTION_CANCEL}, and all further 2007 * events will be delivered to your onTouchEvent() method and no longer 2008 * appear here. 2009 * </ol> 2010 * 2011 * @param ev The motion event being dispatched down the hierarchy. 2012 * @return Return true to steal motion events from the children and have 2013 * them dispatched to this ViewGroup through onTouchEvent(). 2014 * The current target will receive an ACTION_CANCEL event, and no further 2015 * messages will be delivered here. 2016 */ 2017 public boolean onInterceptTouchEvent(MotionEvent ev) { 2018 return false; 2019 } 2020 2021 /** 2022 * {@inheritDoc} 2023 * 2024 * Looks for a view to give focus to respecting the setting specified by 2025 * {@link #getDescendantFocusability()}. 2026 * 2027 * Uses {@link #onRequestFocusInDescendants(int, android.graphics.Rect)} to 2028 * find focus within the children of this group when appropriate. 2029 * 2030 * @see #FOCUS_BEFORE_DESCENDANTS 2031 * @see #FOCUS_AFTER_DESCENDANTS 2032 * @see #FOCUS_BLOCK_DESCENDANTS 2033 * @see #onRequestFocusInDescendants(int, android.graphics.Rect) 2034 */ 2035 @Override 2036 public boolean requestFocus(int direction, Rect previouslyFocusedRect) { 2037 if (DBG) { 2038 System.out.println(this + " ViewGroup.requestFocus direction=" 2039 + direction); 2040 } 2041 int descendantFocusability = getDescendantFocusability(); 2042 2043 switch (descendantFocusability) { 2044 case FOCUS_BLOCK_DESCENDANTS: 2045 return super.requestFocus(direction, previouslyFocusedRect); 2046 case FOCUS_BEFORE_DESCENDANTS: { 2047 final boolean took = super.requestFocus(direction, previouslyFocusedRect); 2048 return took ? took : onRequestFocusInDescendants(direction, previouslyFocusedRect); 2049 } 2050 case FOCUS_AFTER_DESCENDANTS: { 2051 final boolean took = onRequestFocusInDescendants(direction, previouslyFocusedRect); 2052 return took ? took : super.requestFocus(direction, previouslyFocusedRect); 2053 } 2054 default: 2055 throw new IllegalStateException("descendant focusability must be " 2056 + "one of FOCUS_BEFORE_DESCENDANTS, FOCUS_AFTER_DESCENDANTS, FOCUS_BLOCK_DESCENDANTS " 2057 + "but is " + descendantFocusability); 2058 } 2059 } 2060 2061 /** 2062 * Look for a descendant to call {@link View#requestFocus} on. 2063 * Called by {@link ViewGroup#requestFocus(int, android.graphics.Rect)} 2064 * when it wants to request focus within its children. Override this to 2065 * customize how your {@link ViewGroup} requests focus within its children. 2066 * @param direction One of FOCUS_UP, FOCUS_DOWN, FOCUS_LEFT, and FOCUS_RIGHT 2067 * @param previouslyFocusedRect The rectangle (in this View's coordinate system) 2068 * to give a finer grained hint about where focus is coming from. May be null 2069 * if there is no hint. 2070 * @return Whether focus was taken. 2071 */ 2072 @SuppressWarnings({"ConstantConditions"}) 2073 protected boolean onRequestFocusInDescendants(int direction, 2074 Rect previouslyFocusedRect) { 2075 int index; 2076 int increment; 2077 int end; 2078 int count = mChildrenCount; 2079 if ((direction & FOCUS_FORWARD) != 0) { 2080 index = 0; 2081 increment = 1; 2082 end = count; 2083 } else { 2084 index = count - 1; 2085 increment = -1; 2086 end = -1; 2087 } 2088 final View[] children = mChildren; 2089 for (int i = index; i != end; i += increment) { 2090 View child = children[i]; 2091 if ((child.mViewFlags & VISIBILITY_MASK) == VISIBLE) { 2092 if (child.requestFocus(direction, previouslyFocusedRect)) { 2093 return true; 2094 } 2095 } 2096 } 2097 return false; 2098 } 2099 2100 /** 2101 * {@inheritDoc} 2102 * 2103 * @hide 2104 */ 2105 @Override 2106 public void dispatchStartTemporaryDetach() { 2107 super.dispatchStartTemporaryDetach(); 2108 final int count = mChildrenCount; 2109 final View[] children = mChildren; 2110 for (int i = 0; i < count; i++) { 2111 children[i].dispatchStartTemporaryDetach(); 2112 } 2113 } 2114 2115 /** 2116 * {@inheritDoc} 2117 * 2118 * @hide 2119 */ 2120 @Override 2121 public void dispatchFinishTemporaryDetach() { 2122 super.dispatchFinishTemporaryDetach(); 2123 final int count = mChildrenCount; 2124 final View[] children = mChildren; 2125 for (int i = 0; i < count; i++) { 2126 children[i].dispatchFinishTemporaryDetach(); 2127 } 2128 } 2129 2130 /** 2131 * {@inheritDoc} 2132 */ 2133 @Override 2134 void dispatchAttachedToWindow(AttachInfo info, int visibility) { 2135 super.dispatchAttachedToWindow(info, visibility); 2136 visibility |= mViewFlags & VISIBILITY_MASK; 2137 final int count = mChildrenCount; 2138 final View[] children = mChildren; 2139 for (int i = 0; i < count; i++) { 2140 children[i].dispatchAttachedToWindow(info, visibility); 2141 } 2142 } 2143 2144 @Override 2145 public boolean dispatchPopulateAccessibilityEvent(AccessibilityEvent event) { 2146 // We first get a chance to populate the event. 2147 onPopulateAccessibilityEvent(event); 2148 // Let our children have a shot in populating the event. 2149 for (int i = 0, count = getChildCount(); i < count; i++) { 2150 View child = getChildAt(i); 2151 if ((child.mViewFlags & VISIBILITY_MASK) == VISIBLE) { 2152 boolean handled = getChildAt(i).dispatchPopulateAccessibilityEvent(event); 2153 if (handled) { 2154 return handled; 2155 } 2156 } 2157 } 2158 return false; 2159 } 2160 2161 @Override 2162 public void onInitializeAccessibilityNodeInfo(AccessibilityNodeInfo info) { 2163 super.onInitializeAccessibilityNodeInfo(info); 2164 // If the view is not the topmost one in the view hierarchy and it is 2165 // marked as the logical root of a view hierarchy, do not go any deeper. 2166 if ((!(getParent() instanceof ViewRootImpl)) && (mPrivateFlags & IS_ROOT_NAMESPACE) != 0) { 2167 return; 2168 } 2169 for (int i = 0, count = mChildrenCount; i < count; i++) { 2170 View child = mChildren[i]; 2171 if ((child.mViewFlags & VISIBILITY_MASK) == VISIBLE) { 2172 info.addChild(child); 2173 } 2174 } 2175 } 2176 2177 /** 2178 * {@inheritDoc} 2179 */ 2180 @Override 2181 void dispatchDetachedFromWindow() { 2182 // If we still have a touch target, we are still in the process of 2183 // dispatching motion events to a child; we need to get rid of that 2184 // child to avoid dispatching events to it after the window is torn 2185 // down. To make sure we keep the child in a consistent state, we 2186 // first send it an ACTION_CANCEL motion event. 2187 cancelAndClearTouchTargets(null); 2188 2189 // In case view is detached while transition is running 2190 mLayoutSuppressed = false; 2191 2192 // Tear down our drag tracking 2193 mDragNotifiedChildren = null; 2194 if (mCurrentDrag != null) { 2195 mCurrentDrag.recycle(); 2196 mCurrentDrag = null; 2197 } 2198 2199 final int count = mChildrenCount; 2200 final View[] children = mChildren; 2201 for (int i = 0; i < count; i++) { 2202 children[i].dispatchDetachedFromWindow(); 2203 } 2204 super.dispatchDetachedFromWindow(); 2205 } 2206 2207 /** 2208 * {@inheritDoc} 2209 */ 2210 @Override 2211 public void setPadding(int left, int top, int right, int bottom) { 2212 super.setPadding(left, top, right, bottom); 2213 2214 if ((mPaddingLeft | mPaddingTop | mPaddingRight | mPaddingBottom) != 0) { 2215 mGroupFlags |= FLAG_PADDING_NOT_NULL; 2216 } else { 2217 mGroupFlags &= ~FLAG_PADDING_NOT_NULL; 2218 } 2219 } 2220 2221 /** 2222 * {@inheritDoc} 2223 */ 2224 @Override 2225 protected void dispatchSaveInstanceState(SparseArray<Parcelable> container) { 2226 super.dispatchSaveInstanceState(container); 2227 final int count = mChildrenCount; 2228 final View[] children = mChildren; 2229 for (int i = 0; i < count; i++) { 2230 View c = children[i]; 2231 if ((c.mViewFlags & PARENT_SAVE_DISABLED_MASK) != PARENT_SAVE_DISABLED) { 2232 c.dispatchSaveInstanceState(container); 2233 } 2234 } 2235 } 2236 2237 /** 2238 * Perform dispatching of a {@link #saveHierarchyState(android.util.SparseArray)} freeze()} 2239 * to only this view, not to its children. For use when overriding 2240 * {@link #dispatchSaveInstanceState(android.util.SparseArray)} dispatchFreeze()} to allow 2241 * subclasses to freeze their own state but not the state of their children. 2242 * 2243 * @param container the container 2244 */ 2245 protected void dispatchFreezeSelfOnly(SparseArray<Parcelable> container) { 2246 super.dispatchSaveInstanceState(container); 2247 } 2248 2249 /** 2250 * {@inheritDoc} 2251 */ 2252 @Override 2253 protected void dispatchRestoreInstanceState(SparseArray<Parcelable> container) { 2254 super.dispatchRestoreInstanceState(container); 2255 final int count = mChildrenCount; 2256 final View[] children = mChildren; 2257 for (int i = 0; i < count; i++) { 2258 View c = children[i]; 2259 if ((c.mViewFlags & PARENT_SAVE_DISABLED_MASK) != PARENT_SAVE_DISABLED) { 2260 c.dispatchRestoreInstanceState(container); 2261 } 2262 } 2263 } 2264 2265 /** 2266 * Perform dispatching of a {@link #restoreHierarchyState(android.util.SparseArray)} 2267 * to only this view, not to its children. For use when overriding 2268 * {@link #dispatchRestoreInstanceState(android.util.SparseArray)} to allow 2269 * subclasses to thaw their own state but not the state of their children. 2270 * 2271 * @param container the container 2272 */ 2273 protected void dispatchThawSelfOnly(SparseArray<Parcelable> container) { 2274 super.dispatchRestoreInstanceState(container); 2275 } 2276 2277 /** 2278 * Enables or disables the drawing cache for each child of this view group. 2279 * 2280 * @param enabled true to enable the cache, false to dispose of it 2281 */ 2282 protected void setChildrenDrawingCacheEnabled(boolean enabled) { 2283 if (enabled || (mPersistentDrawingCache & PERSISTENT_ALL_CACHES) != PERSISTENT_ALL_CACHES) { 2284 final View[] children = mChildren; 2285 final int count = mChildrenCount; 2286 for (int i = 0; i < count; i++) { 2287 children[i].setDrawingCacheEnabled(enabled); 2288 } 2289 } 2290 } 2291 2292 @Override 2293 protected void onAnimationStart() { 2294 super.onAnimationStart(); 2295 2296 // When this ViewGroup's animation starts, build the cache for the children 2297 if ((mGroupFlags & FLAG_ANIMATION_CACHE) == FLAG_ANIMATION_CACHE) { 2298 final int count = mChildrenCount; 2299 final View[] children = mChildren; 2300 final boolean buildCache = !isHardwareAccelerated(); 2301 2302 for (int i = 0; i < count; i++) { 2303 final View child = children[i]; 2304 if ((child.mViewFlags & VISIBILITY_MASK) == VISIBLE) { 2305 child.setDrawingCacheEnabled(true); 2306 if (buildCache) { 2307 child.buildDrawingCache(true); 2308 } 2309 } 2310 } 2311 2312 mGroupFlags |= FLAG_CHILDREN_DRAWN_WITH_CACHE; 2313 } 2314 } 2315 2316 @Override 2317 protected void onAnimationEnd() { 2318 super.onAnimationEnd(); 2319 2320 // When this ViewGroup's animation ends, destroy the cache of the children 2321 if ((mGroupFlags & FLAG_ANIMATION_CACHE) == FLAG_ANIMATION_CACHE) { 2322 mGroupFlags &= ~FLAG_CHILDREN_DRAWN_WITH_CACHE; 2323 2324 if ((mPersistentDrawingCache & PERSISTENT_ANIMATION_CACHE) == 0) { 2325 setChildrenDrawingCacheEnabled(false); 2326 } 2327 } 2328 } 2329 2330 @Override 2331 Bitmap createSnapshot(Bitmap.Config quality, int backgroundColor, boolean skipChildren) { 2332 int count = mChildrenCount; 2333 int[] visibilities = null; 2334 2335 if (skipChildren) { 2336 visibilities = new int[count]; 2337 for (int i = 0; i < count; i++) { 2338 View child = getChildAt(i); 2339 visibilities[i] = child.getVisibility(); 2340 if (visibilities[i] == View.VISIBLE) { 2341 child.setVisibility(INVISIBLE); 2342 } 2343 } 2344 } 2345 2346 Bitmap b = super.createSnapshot(quality, backgroundColor, skipChildren); 2347 2348 if (skipChildren) { 2349 for (int i = 0; i < count; i++) { 2350 getChildAt(i).setVisibility(visibilities[i]); 2351 } 2352 } 2353 2354 return b; 2355 } 2356 2357 /** 2358 * {@inheritDoc} 2359 */ 2360 @Override 2361 protected void dispatchDraw(Canvas canvas) { 2362 final int count = mChildrenCount; 2363 final View[] children = mChildren; 2364 int flags = mGroupFlags; 2365 2366 if ((flags & FLAG_RUN_ANIMATION) != 0 && canAnimate()) { 2367 final boolean cache = (mGroupFlags & FLAG_ANIMATION_CACHE) == FLAG_ANIMATION_CACHE; 2368 2369 final boolean buildCache = !isHardwareAccelerated(); 2370 for (int i = 0; i < count; i++) { 2371 final View child = children[i]; 2372 if ((child.mViewFlags & VISIBILITY_MASK) == VISIBLE) { 2373 final LayoutParams params = child.getLayoutParams(); 2374 attachLayoutAnimationParameters(child, params, i, count); 2375 bindLayoutAnimation(child); 2376 if (cache) { 2377 child.setDrawingCacheEnabled(true); 2378 if (buildCache) { 2379 child.buildDrawingCache(true); 2380 } 2381 } 2382 } 2383 } 2384 2385 final LayoutAnimationController controller = mLayoutAnimationController; 2386 if (controller.willOverlap()) { 2387 mGroupFlags |= FLAG_OPTIMIZE_INVALIDATE; 2388 } 2389 2390 controller.start(); 2391 2392 mGroupFlags &= ~FLAG_RUN_ANIMATION; 2393 mGroupFlags &= ~FLAG_ANIMATION_DONE; 2394 2395 if (cache) { 2396 mGroupFlags |= FLAG_CHILDREN_DRAWN_WITH_CACHE; 2397 } 2398 2399 if (mAnimationListener != null) { 2400 mAnimationListener.onAnimationStart(controller.getAnimation()); 2401 } 2402 } 2403 2404 int saveCount = 0; 2405 final boolean clipToPadding = (flags & CLIP_TO_PADDING_MASK) == CLIP_TO_PADDING_MASK; 2406 if (clipToPadding) { 2407 saveCount = canvas.save(); 2408 canvas.clipRect(mScrollX + mPaddingLeft, mScrollY + mPaddingTop, 2409 mScrollX + mRight - mLeft - mPaddingRight, 2410 mScrollY + mBottom - mTop - mPaddingBottom); 2411 2412 } 2413 2414 // We will draw our child's animation, let's reset the flag 2415 mPrivateFlags &= ~DRAW_ANIMATION; 2416 mGroupFlags &= ~FLAG_INVALIDATE_REQUIRED; 2417 2418 boolean more = false; 2419 final long drawingTime = getDrawingTime(); 2420 2421 if ((flags & FLAG_USE_CHILD_DRAWING_ORDER) == 0) { 2422 for (int i = 0; i < count; i++) { 2423 final View child = children[i]; 2424 if ((child.mViewFlags & VISIBILITY_MASK) == VISIBLE || child.getAnimation() != null) { 2425 more |= drawChild(canvas, child, drawingTime); 2426 } 2427 } 2428 } else { 2429 for (int i = 0; i < count; i++) { 2430 final View child = children[getChildDrawingOrder(count, i)]; 2431 if ((child.mViewFlags & VISIBILITY_MASK) == VISIBLE || child.getAnimation() != null) { 2432 more |= drawChild(canvas, child, drawingTime); 2433 } 2434 } 2435 } 2436 2437 // Draw any disappearing views that have animations 2438 if (mDisappearingChildren != null) { 2439 final ArrayList<View> disappearingChildren = mDisappearingChildren; 2440 final int disappearingCount = disappearingChildren.size() - 1; 2441 // Go backwards -- we may delete as animations finish 2442 for (int i = disappearingCount; i >= 0; i--) { 2443 final View child = disappearingChildren.get(i); 2444 more |= drawChild(canvas, child, drawingTime); 2445 } 2446 } 2447 2448 if (clipToPadding) { 2449 canvas.restoreToCount(saveCount); 2450 } 2451 2452 // mGroupFlags might have been updated by drawChild() 2453 flags = mGroupFlags; 2454 2455 if ((flags & FLAG_INVALIDATE_REQUIRED) == FLAG_INVALIDATE_REQUIRED) { 2456 invalidate(true); 2457 } 2458 2459 if ((flags & FLAG_ANIMATION_DONE) == 0 && (flags & FLAG_NOTIFY_ANIMATION_LISTENER) == 0 && 2460 mLayoutAnimationController.isDone() && !more) { 2461 // We want to erase the drawing cache and notify the listener after the 2462 // next frame is drawn because one extra invalidate() is caused by 2463 // drawChild() after the animation is over 2464 mGroupFlags |= FLAG_NOTIFY_ANIMATION_LISTENER; 2465 final Runnable end = new Runnable() { 2466 public void run() { 2467 notifyAnimationListener(); 2468 } 2469 }; 2470 post(end); 2471 } 2472 } 2473 2474 /** 2475 * Returns the index of the child to draw for this iteration. Override this 2476 * if you want to change the drawing order of children. By default, it 2477 * returns i. 2478 * <p> 2479 * NOTE: In order for this method to be called, you must enable child ordering 2480 * first by calling {@link #setChildrenDrawingOrderEnabled(boolean)}. 2481 * 2482 * @param i The current iteration. 2483 * @return The index of the child to draw this iteration. 2484 * 2485 * @see #setChildrenDrawingOrderEnabled(boolean) 2486 * @see #isChildrenDrawingOrderEnabled() 2487 */ 2488 protected int getChildDrawingOrder(int childCount, int i) { 2489 return i; 2490 } 2491 2492 private void notifyAnimationListener() { 2493 mGroupFlags &= ~FLAG_NOTIFY_ANIMATION_LISTENER; 2494 mGroupFlags |= FLAG_ANIMATION_DONE; 2495 2496 if (mAnimationListener != null) { 2497 final Runnable end = new Runnable() { 2498 public void run() { 2499 mAnimationListener.onAnimationEnd(mLayoutAnimationController.getAnimation()); 2500 } 2501 }; 2502 post(end); 2503 } 2504 2505 if ((mGroupFlags & FLAG_ANIMATION_CACHE) == FLAG_ANIMATION_CACHE) { 2506 mGroupFlags &= ~FLAG_CHILDREN_DRAWN_WITH_CACHE; 2507 if ((mPersistentDrawingCache & PERSISTENT_ANIMATION_CACHE) == 0) { 2508 setChildrenDrawingCacheEnabled(false); 2509 } 2510 } 2511 2512 invalidate(true); 2513 } 2514 2515 /** 2516 * This method is used to cause children of this ViewGroup to restore or recreate their 2517 * display lists. It is called by getDisplayList() when the parent ViewGroup does not need 2518 * to recreate its own display list, which would happen if it went through the normal 2519 * draw/dispatchDraw mechanisms. 2520 * 2521 * @hide 2522 */ 2523 @Override 2524 protected void dispatchGetDisplayList() { 2525 final int count = mChildrenCount; 2526 final View[] children = mChildren; 2527 for (int i = 0; i < count; i++) { 2528 final View child = children[i]; 2529 if ((child.mViewFlags & VISIBILITY_MASK) == VISIBLE || child.getAnimation() != null) { 2530 child.mRecreateDisplayList = (child.mPrivateFlags & INVALIDATED) == INVALIDATED; 2531 child.mPrivateFlags &= ~INVALIDATED; 2532 child.getDisplayList(); 2533 child.mRecreateDisplayList = false; 2534 } 2535 } 2536 } 2537 2538 /** 2539 * Draw one child of this View Group. This method is responsible for getting 2540 * the canvas in the right state. This includes clipping, translating so 2541 * that the child's scrolled origin is at 0, 0, and applying any animation 2542 * transformations. 2543 * 2544 * @param canvas The canvas on which to draw the child 2545 * @param child Who to draw 2546 * @param drawingTime The time at which draw is occuring 2547 * @return True if an invalidate() was issued 2548 */ 2549 protected boolean drawChild(Canvas canvas, View child, long drawingTime) { 2550 boolean more = false; 2551 2552 final int cl = child.mLeft; 2553 final int ct = child.mTop; 2554 final int cr = child.mRight; 2555 final int cb = child.mBottom; 2556 2557 final boolean childHasIdentityMatrix = child.hasIdentityMatrix(); 2558 2559 final int flags = mGroupFlags; 2560 2561 if ((flags & FLAG_CLEAR_TRANSFORMATION) == FLAG_CLEAR_TRANSFORMATION) { 2562 mChildTransformation.clear(); 2563 mGroupFlags &= ~FLAG_CLEAR_TRANSFORMATION; 2564 } 2565 2566 Transformation transformToApply = null; 2567 Transformation invalidationTransform; 2568 final Animation a = child.getAnimation(); 2569 boolean concatMatrix = false; 2570 2571 boolean scalingRequired = false; 2572 boolean caching; 2573 int layerType = mDrawLayers ? child.getLayerType() : LAYER_TYPE_NONE; 2574 2575 final boolean hardwareAccelerated = canvas.isHardwareAccelerated(); 2576 if ((flags & FLAG_CHILDREN_DRAWN_WITH_CACHE) == FLAG_CHILDREN_DRAWN_WITH_CACHE || 2577 (flags & FLAG_ALWAYS_DRAWN_WITH_CACHE) == FLAG_ALWAYS_DRAWN_WITH_CACHE) { 2578 caching = true; 2579 if (mAttachInfo != null) scalingRequired = mAttachInfo.mScalingRequired; 2580 } else { 2581 caching = (layerType != LAYER_TYPE_NONE) || hardwareAccelerated; 2582 } 2583 2584 if (a != null) { 2585 final boolean initialized = a.isInitialized(); 2586 if (!initialized) { 2587 a.initialize(cr - cl, cb - ct, getWidth(), getHeight()); 2588 a.initializeInvalidateRegion(0, 0, cr - cl, cb - ct); 2589 child.onAnimationStart(); 2590 } 2591 2592 more = a.getTransformation(drawingTime, mChildTransformation, 2593 scalingRequired ? mAttachInfo.mApplicationScale : 1f); 2594 if (scalingRequired && mAttachInfo.mApplicationScale != 1f) { 2595 if (mInvalidationTransformation == null) { 2596 mInvalidationTransformation = new Transformation(); 2597 } 2598 invalidationTransform = mInvalidationTransformation; 2599 a.getTransformation(drawingTime, invalidationTransform, 1f); 2600 } else { 2601 invalidationTransform = mChildTransformation; 2602 } 2603 transformToApply = mChildTransformation; 2604 2605 concatMatrix = a.willChangeTransformationMatrix(); 2606 2607 if (more) { 2608 if (!a.willChangeBounds()) { 2609 if ((flags & (FLAG_OPTIMIZE_INVALIDATE | FLAG_ANIMATION_DONE)) == 2610 FLAG_OPTIMIZE_INVALIDATE) { 2611 mGroupFlags |= FLAG_INVALIDATE_REQUIRED; 2612 } else if ((flags & FLAG_INVALIDATE_REQUIRED) == 0) { 2613 // The child need to draw an animation, potentially offscreen, so 2614 // make sure we do not cancel invalidate requests 2615 mPrivateFlags |= DRAW_ANIMATION; 2616 invalidate(cl, ct, cr, cb); 2617 } 2618 } else { 2619 if (mInvalidateRegion == null) { 2620 mInvalidateRegion = new RectF(); 2621 } 2622 final RectF region = mInvalidateRegion; 2623 a.getInvalidateRegion(0, 0, cr - cl, cb - ct, region, invalidationTransform); 2624 2625 // The child need to draw an animation, potentially offscreen, so 2626 // make sure we do not cancel invalidate requests 2627 mPrivateFlags |= DRAW_ANIMATION; 2628 2629 final int left = cl + (int) region.left; 2630 final int top = ct + (int) region.top; 2631 invalidate(left, top, left + (int) region.width(), top + (int) region.height()); 2632 } 2633 } 2634 } else if ((flags & FLAG_SUPPORT_STATIC_TRANSFORMATIONS) == 2635 FLAG_SUPPORT_STATIC_TRANSFORMATIONS) { 2636 final boolean hasTransform = getChildStaticTransformation(child, mChildTransformation); 2637 if (hasTransform) { 2638 final int transformType = mChildTransformation.getTransformationType(); 2639 transformToApply = transformType != Transformation.TYPE_IDENTITY ? 2640 mChildTransformation : null; 2641 concatMatrix = (transformType & Transformation.TYPE_MATRIX) != 0; 2642 } 2643 } 2644 2645 concatMatrix |= !childHasIdentityMatrix; 2646 2647 // Sets the flag as early as possible to allow draw() implementations 2648 // to call invalidate() successfully when doing animations 2649 child.mPrivateFlags |= DRAWN; 2650 2651 if (!concatMatrix && canvas.quickReject(cl, ct, cr, cb, Canvas.EdgeType.BW) && 2652 (child.mPrivateFlags & DRAW_ANIMATION) == 0) { 2653 return more; 2654 } 2655 2656 float alpha = child.getAlpha(); 2657 // Bail out early if the view does not need to be drawn 2658 if (alpha <= ViewConfiguration.ALPHA_THRESHOLD && (child.mPrivateFlags & ALPHA_SET) == 0 && 2659 !(child instanceof SurfaceView)) { 2660 return more; 2661 } 2662 2663 if (hardwareAccelerated) { 2664 // Clear INVALIDATED flag to allow invalidation to occur during rendering, but 2665 // retain the flag's value temporarily in the mRecreateDisplayList flag 2666 child.mRecreateDisplayList = (child.mPrivateFlags & INVALIDATED) == INVALIDATED; 2667 child.mPrivateFlags &= ~INVALIDATED; 2668 } 2669 2670 child.computeScroll(); 2671 2672 final int sx = child.mScrollX; 2673 final int sy = child.mScrollY; 2674 2675 DisplayList displayList = null; 2676 Bitmap cache = null; 2677 boolean hasDisplayList = false; 2678 if (caching) { 2679 if (!hardwareAccelerated) { 2680 if (layerType != LAYER_TYPE_NONE) { 2681 layerType = LAYER_TYPE_SOFTWARE; 2682 child.buildDrawingCache(true); 2683 } 2684 cache = child.getDrawingCache(true); 2685 } else { 2686 switch (layerType) { 2687 case LAYER_TYPE_SOFTWARE: 2688 child.buildDrawingCache(true); 2689 cache = child.getDrawingCache(true); 2690 break; 2691 case LAYER_TYPE_NONE: 2692 // Delay getting the display list until animation-driven alpha values are 2693 // set up and possibly passed on to the view 2694 hasDisplayList = child.canHaveDisplayList(); 2695 break; 2696 } 2697 } 2698 } 2699 2700 final boolean hasNoCache = cache == null || hasDisplayList; 2701 final boolean offsetForScroll = cache == null && !hasDisplayList && 2702 layerType != LAYER_TYPE_HARDWARE; 2703 2704 final int restoreTo = canvas.save(); 2705 if (offsetForScroll) { 2706 canvas.translate(cl - sx, ct - sy); 2707 } else { 2708 canvas.translate(cl, ct); 2709 if (scalingRequired) { 2710 // mAttachInfo cannot be null, otherwise scalingRequired == false 2711 final float scale = 1.0f / mAttachInfo.mApplicationScale; 2712 canvas.scale(scale, scale); 2713 } 2714 } 2715 2716 if (transformToApply != null || alpha < 1.0f || !child.hasIdentityMatrix()) { 2717 if (transformToApply != null || !childHasIdentityMatrix) { 2718 int transX = 0; 2719 int transY = 0; 2720 2721 if (offsetForScroll) { 2722 transX = -sx; 2723 transY = -sy; 2724 } 2725 2726 if (transformToApply != null) { 2727 if (concatMatrix) { 2728 // Undo the scroll translation, apply the transformation matrix, 2729 // then redo the scroll translate to get the correct result. 2730 canvas.translate(-transX, -transY); 2731 canvas.concat(transformToApply.getMatrix()); 2732 canvas.translate(transX, transY); 2733 mGroupFlags |= FLAG_CLEAR_TRANSFORMATION; 2734 } 2735 2736 float transformAlpha = transformToApply.getAlpha(); 2737 if (transformAlpha < 1.0f) { 2738 alpha *= transformToApply.getAlpha(); 2739 mGroupFlags |= FLAG_CLEAR_TRANSFORMATION; 2740 } 2741 } 2742 2743 if (!childHasIdentityMatrix) { 2744 canvas.translate(-transX, -transY); 2745 canvas.concat(child.getMatrix()); 2746 canvas.translate(transX, transY); 2747 } 2748 } 2749 2750 if (alpha < 1.0f) { 2751 mGroupFlags |= FLAG_CLEAR_TRANSFORMATION; 2752 if (hasNoCache) { 2753 final int multipliedAlpha = (int) (255 * alpha); 2754 if (!child.onSetAlpha(multipliedAlpha)) { 2755 int layerFlags = Canvas.HAS_ALPHA_LAYER_SAVE_FLAG; 2756 if ((flags & FLAG_CLIP_CHILDREN) == FLAG_CLIP_CHILDREN || 2757 layerType != LAYER_TYPE_NONE) { 2758 layerFlags |= Canvas.CLIP_TO_LAYER_SAVE_FLAG; 2759 } 2760 if (layerType == LAYER_TYPE_NONE) { 2761 final int scrollX = hasDisplayList ? 0 : sx; 2762 final int scrollY = hasDisplayList ? 0 : sy; 2763 canvas.saveLayerAlpha(scrollX, scrollY, scrollX + cr - cl, 2764 scrollY + cb - ct, multipliedAlpha, layerFlags); 2765 } 2766 } else { 2767 // Alpha is handled by the child directly, clobber the layer's alpha 2768 child.mPrivateFlags |= ALPHA_SET; 2769 } 2770 } 2771 } 2772 } else if ((child.mPrivateFlags & ALPHA_SET) == ALPHA_SET) { 2773 child.onSetAlpha(255); 2774 child.mPrivateFlags &= ~ALPHA_SET; 2775 } 2776 2777 if ((flags & FLAG_CLIP_CHILDREN) == FLAG_CLIP_CHILDREN) { 2778 if (offsetForScroll) { 2779 canvas.clipRect(sx, sy, sx + (cr - cl), sy + (cb - ct)); 2780 } else { 2781 if (!scalingRequired || cache == null) { 2782 canvas.clipRect(0, 0, cr - cl, cb - ct); 2783 } else { 2784 canvas.clipRect(0, 0, cache.getWidth(), cache.getHeight()); 2785 } 2786 } 2787 } 2788 2789 if (hasDisplayList) { 2790 displayList = child.getDisplayList(); 2791 } 2792 2793 if (hasNoCache) { 2794 boolean layerRendered = false; 2795 if (layerType == LAYER_TYPE_HARDWARE) { 2796 final HardwareLayer layer = child.getHardwareLayer(); 2797 if (layer != null && layer.isValid()) { 2798 child.mLayerPaint.setAlpha((int) (alpha * 255)); 2799 ((HardwareCanvas) canvas).drawHardwareLayer(layer, 0, 0, child.mLayerPaint); 2800 layerRendered = true; 2801 } else { 2802 final int scrollX = hasDisplayList ? 0 : sx; 2803 final int scrollY = hasDisplayList ? 0 : sy; 2804 canvas.saveLayer(scrollX, scrollY, 2805 scrollX + cr - cl, scrollY + cb - ct, child.mLayerPaint, 2806 Canvas.HAS_ALPHA_LAYER_SAVE_FLAG | Canvas.CLIP_TO_LAYER_SAVE_FLAG); 2807 } 2808 } 2809 2810 if (!layerRendered) { 2811 if (!hasDisplayList) { 2812 // Fast path for layouts with no backgrounds 2813 if ((child.mPrivateFlags & SKIP_DRAW) == SKIP_DRAW) { 2814 if (ViewDebug.TRACE_HIERARCHY) { 2815 ViewDebug.trace(this, ViewDebug.HierarchyTraceType.DRAW); 2816 } 2817 child.mPrivateFlags &= ~DIRTY_MASK; 2818 child.dispatchDraw(canvas); 2819 } else { 2820 child.draw(canvas); 2821 } 2822 } else { 2823 child.mPrivateFlags &= ~DIRTY_MASK; 2824 ((HardwareCanvas) canvas).drawDisplayList(displayList, cr - cl, cb - ct, null); 2825 } 2826 } 2827 } else if (cache != null) { 2828 child.mPrivateFlags &= ~DIRTY_MASK; 2829 Paint cachePaint; 2830 2831 if (layerType == LAYER_TYPE_NONE) { 2832 cachePaint = mCachePaint; 2833 if (alpha < 1.0f) { 2834 cachePaint.setAlpha((int) (alpha * 255)); 2835 mGroupFlags |= FLAG_ALPHA_LOWER_THAN_ONE; 2836 } else if ((flags & FLAG_ALPHA_LOWER_THAN_ONE) == FLAG_ALPHA_LOWER_THAN_ONE) { 2837 cachePaint.setAlpha(255); 2838 mGroupFlags &= ~FLAG_ALPHA_LOWER_THAN_ONE; 2839 } 2840 } else { 2841 cachePaint = child.mLayerPaint; 2842 cachePaint.setAlpha((int) (alpha * 255)); 2843 } 2844 canvas.drawBitmap(cache, 0.0f, 0.0f, cachePaint); 2845 } 2846 2847 canvas.restoreToCount(restoreTo); 2848 2849 if (a != null && !more) { 2850 if (!hardwareAccelerated && !a.getFillAfter()) { 2851 child.onSetAlpha(255); 2852 } 2853 finishAnimatingView(child, a); 2854 } 2855 2856 if (more && hardwareAccelerated) { 2857 // invalidation is the trigger to recreate display lists, so if we're using 2858 // display lists to render, force an invalidate to allow the animation to 2859 // continue drawing another frame 2860 invalidate(true); 2861 if (a.hasAlpha() && (child.mPrivateFlags & ALPHA_SET) == ALPHA_SET) { 2862 // alpha animations should cause the child to recreate its display list 2863 child.invalidate(true); 2864 } 2865 } 2866 2867 child.mRecreateDisplayList = false; 2868 2869 return more; 2870 } 2871 2872 /** 2873 * 2874 * @param enabled True if children should be drawn with layers, false otherwise. 2875 * 2876 * @hide 2877 */ 2878 public void setChildrenLayersEnabled(boolean enabled) { 2879 if (enabled != mDrawLayers) { 2880 mDrawLayers = enabled; 2881 invalidate(true); 2882 2883 // We need to invalidate any child with a layer. For instance, 2884 // if a child is backed by a hardware layer and we disable layers 2885 // the child is marked as not dirty (flags cleared the last time 2886 // the child was drawn inside its layer.) However, that child might 2887 // never have created its own display list or have an obsolete 2888 // display list. By invalidating the child we ensure the display 2889 // list is in sync with the content of the hardware layer. 2890 for (int i = 0; i < mChildrenCount; i++) { 2891 View child = mChildren[i]; 2892 if (child.mLayerType != LAYER_TYPE_NONE) { 2893 child.invalidate(true); 2894 } 2895 } 2896 } 2897 } 2898 2899 /** 2900 * By default, children are clipped to their bounds before drawing. This 2901 * allows view groups to override this behavior for animations, etc. 2902 * 2903 * @param clipChildren true to clip children to their bounds, 2904 * false otherwise 2905 * @attr ref android.R.styleable#ViewGroup_clipChildren 2906 */ 2907 public void setClipChildren(boolean clipChildren) { 2908 setBooleanFlag(FLAG_CLIP_CHILDREN, clipChildren); 2909 } 2910 2911 /** 2912 * By default, children are clipped to the padding of the ViewGroup. This 2913 * allows view groups to override this behavior 2914 * 2915 * @param clipToPadding true to clip children to the padding of the 2916 * group, false otherwise 2917 * @attr ref android.R.styleable#ViewGroup_clipToPadding 2918 */ 2919 public void setClipToPadding(boolean clipToPadding) { 2920 setBooleanFlag(FLAG_CLIP_TO_PADDING, clipToPadding); 2921 } 2922 2923 /** 2924 * {@inheritDoc} 2925 */ 2926 @Override 2927 public void dispatchSetSelected(boolean selected) { 2928 final View[] children = mChildren; 2929 final int count = mChildrenCount; 2930 for (int i = 0; i < count; i++) { 2931 children[i].setSelected(selected); 2932 } 2933 } 2934 2935 /** 2936 * {@inheritDoc} 2937 */ 2938 @Override 2939 public void dispatchSetActivated(boolean activated) { 2940 final View[] children = mChildren; 2941 final int count = mChildrenCount; 2942 for (int i = 0; i < count; i++) { 2943 children[i].setActivated(activated); 2944 } 2945 } 2946 2947 @Override 2948 protected void dispatchSetPressed(boolean pressed) { 2949 final View[] children = mChildren; 2950 final int count = mChildrenCount; 2951 for (int i = 0; i < count; i++) { 2952 children[i].setPressed(pressed); 2953 } 2954 } 2955 2956 /** 2957 * When this property is set to true, this ViewGroup supports static transformations on 2958 * children; this causes 2959 * {@link #getChildStaticTransformation(View, android.view.animation.Transformation)} to be 2960 * invoked when a child is drawn. 2961 * 2962 * Any subclass overriding 2963 * {@link #getChildStaticTransformation(View, android.view.animation.Transformation)} should 2964 * set this property to true. 2965 * 2966 * @param enabled True to enable static transformations on children, false otherwise. 2967 * 2968 * @see #FLAG_SUPPORT_STATIC_TRANSFORMATIONS 2969 */ 2970 protected void setStaticTransformationsEnabled(boolean enabled) { 2971 setBooleanFlag(FLAG_SUPPORT_STATIC_TRANSFORMATIONS, enabled); 2972 } 2973 2974 /** 2975 * {@inheritDoc} 2976 * 2977 * @see #setStaticTransformationsEnabled(boolean) 2978 */ 2979 protected boolean getChildStaticTransformation(View child, Transformation t) { 2980 return false; 2981 } 2982 2983 /** 2984 * {@hide} 2985 */ 2986 @Override 2987 protected View findViewTraversal(int id) { 2988 if (id == mID) { 2989 return this; 2990 } 2991 2992 final View[] where = mChildren; 2993 final int len = mChildrenCount; 2994 2995 for (int i = 0; i < len; i++) { 2996 View v = where[i]; 2997 2998 if ((v.mPrivateFlags & IS_ROOT_NAMESPACE) == 0) { 2999 v = v.findViewById(id); 3000 3001 if (v != null) { 3002 return v; 3003 } 3004 } 3005 } 3006 3007 return null; 3008 } 3009 3010 /** 3011 * {@hide} 3012 */ 3013 @Override 3014 protected View findViewWithTagTraversal(Object tag) { 3015 if (tag != null && tag.equals(mTag)) { 3016 return this; 3017 } 3018 3019 final View[] where = mChildren; 3020 final int len = mChildrenCount; 3021 3022 for (int i = 0; i < len; i++) { 3023 View v = where[i]; 3024 3025 if ((v.mPrivateFlags & IS_ROOT_NAMESPACE) == 0) { 3026 v = v.findViewWithTag(tag); 3027 3028 if (v != null) { 3029 return v; 3030 } 3031 } 3032 } 3033 3034 return null; 3035 } 3036 3037 /** 3038 * {@hide} 3039 */ 3040 @Override 3041 protected View findViewByPredicateTraversal(Predicate<View> predicate) { 3042 if (predicate.apply(this)) { 3043 return this; 3044 } 3045 3046 final View[] where = mChildren; 3047 final int len = mChildrenCount; 3048 3049 for (int i = 0; i < len; i++) { 3050 View v = where[i]; 3051 3052 if ((v.mPrivateFlags & IS_ROOT_NAMESPACE) == 0) { 3053 v = v.findViewByPredicate(predicate); 3054 3055 if (v != null) { 3056 return v; 3057 } 3058 } 3059 } 3060 3061 return null; 3062 } 3063 3064 /** 3065 * Adds a child view. If no layout parameters are already set on the child, the 3066 * default parameters for this ViewGroup are set on the child. 3067 * 3068 * @param child the child view to add 3069 * 3070 * @see #generateDefaultLayoutParams() 3071 */ 3072 public void addView(View child) { 3073 addView(child, -1); 3074 } 3075 3076 /** 3077 * Adds a child view. If no layout parameters are already set on the child, the 3078 * default parameters for this ViewGroup are set on the child. 3079 * 3080 * @param child the child view to add 3081 * @param index the position at which to add the child 3082 * 3083 * @see #generateDefaultLayoutParams() 3084 */ 3085 public void addView(View child, int index) { 3086 LayoutParams params = child.getLayoutParams(); 3087 if (params == null) { 3088 params = generateDefaultLayoutParams(); 3089 if (params == null) { 3090 throw new IllegalArgumentException("generateDefaultLayoutParams() cannot return null"); 3091 } 3092 } 3093 addView(child, index, params); 3094 } 3095 3096 /** 3097 * Adds a child view with this ViewGroup's default layout parameters and the 3098 * specified width and height. 3099 * 3100 * @param child the child view to add 3101 */ 3102 public void addView(View child, int width, int height) { 3103 final LayoutParams params = generateDefaultLayoutParams(); 3104 params.width = width; 3105 params.height = height; 3106 addView(child, -1, params); 3107 } 3108 3109 /** 3110 * Adds a child view with the specified layout parameters. 3111 * 3112 * @param child the child view to add 3113 * @param params the layout parameters to set on the child 3114 */ 3115 public void addView(View child, LayoutParams params) { 3116 addView(child, -1, params); 3117 } 3118 3119 /** 3120 * Adds a child view with the specified layout parameters. 3121 * 3122 * @param child the child view to add 3123 * @param index the position at which to add the child 3124 * @param params the layout parameters to set on the child 3125 */ 3126 public void addView(View child, int index, LayoutParams params) { 3127 if (DBG) { 3128 System.out.println(this + " addView"); 3129 } 3130 3131 // addViewInner() will call child.requestLayout() when setting the new LayoutParams 3132 // therefore, we call requestLayout() on ourselves before, so that the child's request 3133 // will be blocked at our level 3134 requestLayout(); 3135 invalidate(true); 3136 addViewInner(child, index, params, false); 3137 } 3138 3139 /** 3140 * {@inheritDoc} 3141 */ 3142 public void updateViewLayout(View view, ViewGroup.LayoutParams params) { 3143 if (!checkLayoutParams(params)) { 3144 throw new IllegalArgumentException("Invalid LayoutParams supplied to " + this); 3145 } 3146 if (view.mParent != this) { 3147 throw new IllegalArgumentException("Given view not a child of " + this); 3148 } 3149 view.setLayoutParams(params); 3150 } 3151 3152 /** 3153 * {@inheritDoc} 3154 */ 3155 protected boolean checkLayoutParams(ViewGroup.LayoutParams p) { 3156 return p != null; 3157 } 3158 3159 /** 3160 * Interface definition for a callback to be invoked when the hierarchy 3161 * within this view changed. The hierarchy changes whenever a child is added 3162 * to or removed from this view. 3163 */ 3164 public interface OnHierarchyChangeListener { 3165 /** 3166 * Called when a new child is added to a parent view. 3167 * 3168 * @param parent the view in which a child was added 3169 * @param child the new child view added in the hierarchy 3170 */ 3171 void onChildViewAdded(View parent, View child); 3172 3173 /** 3174 * Called when a child is removed from a parent view. 3175 * 3176 * @param parent the view from which the child was removed 3177 * @param child the child removed from the hierarchy 3178 */ 3179 void onChildViewRemoved(View parent, View child); 3180 } 3181 3182 /** 3183 * Register a callback to be invoked when a child is added to or removed 3184 * from this view. 3185 * 3186 * @param listener the callback to invoke on hierarchy change 3187 */ 3188 public void setOnHierarchyChangeListener(OnHierarchyChangeListener listener) { 3189 mOnHierarchyChangeListener = listener; 3190 } 3191 3192 /** 3193 * @hide 3194 */ 3195 protected void onViewAdded(View child) { 3196 if (mOnHierarchyChangeListener != null) { 3197 mOnHierarchyChangeListener.onChildViewAdded(this, child); 3198 } 3199 } 3200 3201 /** 3202 * @hide 3203 */ 3204 protected void onViewRemoved(View child) { 3205 if (mOnHierarchyChangeListener != null) { 3206 mOnHierarchyChangeListener.onChildViewRemoved(this, child); 3207 } 3208 } 3209 3210 /** 3211 * Adds a view during layout. This is useful if in your onLayout() method, 3212 * you need to add more views (as does the list view for example). 3213 * 3214 * If index is negative, it means put it at the end of the list. 3215 * 3216 * @param child the view to add to the group 3217 * @param index the index at which the child must be added 3218 * @param params the layout parameters to associate with the child 3219 * @return true if the child was added, false otherwise 3220 */ 3221 protected boolean addViewInLayout(View child, int index, LayoutParams params) { 3222 return addViewInLayout(child, index, params, false); 3223 } 3224 3225 /** 3226 * Adds a view during layout. This is useful if in your onLayout() method, 3227 * you need to add more views (as does the list view for example). 3228 * 3229 * If index is negative, it means put it at the end of the list. 3230 * 3231 * @param child the view to add to the group 3232 * @param index the index at which the child must be added 3233 * @param params the layout parameters to associate with the child 3234 * @param preventRequestLayout if true, calling this method will not trigger a 3235 * layout request on child 3236 * @return true if the child was added, false otherwise 3237 */ 3238 protected boolean addViewInLayout(View child, int index, LayoutParams params, 3239 boolean preventRequestLayout) { 3240 child.mParent = null; 3241 addViewInner(child, index, params, preventRequestLayout); 3242 child.mPrivateFlags = (child.mPrivateFlags & ~DIRTY_MASK) | DRAWN; 3243 return true; 3244 } 3245 3246 /** 3247 * Prevents the specified child to be laid out during the next layout pass. 3248 * 3249 * @param child the child on which to perform the cleanup 3250 */ 3251 protected void cleanupLayoutState(View child) { 3252 child.mPrivateFlags &= ~View.FORCE_LAYOUT; 3253 } 3254 3255 private void addViewInner(View child, int index, LayoutParams params, 3256 boolean preventRequestLayout) { 3257 3258 if (mTransition != null) { 3259 // Don't prevent other add transitions from completing, but cancel remove 3260 // transitions to let them complete the process before we add to the container 3261 mTransition.cancel(LayoutTransition.DISAPPEARING); 3262 } 3263 3264 if (child.getParent() != null) { 3265 throw new IllegalStateException("The specified child already has a parent. " + 3266 "You must call removeView() on the child's parent first."); 3267 } 3268 3269 if (mTransition != null) { 3270 mTransition.addChild(this, child); 3271 } 3272 3273 if (!checkLayoutParams(params)) { 3274 params = generateLayoutParams(params); 3275 } 3276 3277 if (preventRequestLayout) { 3278 child.mLayoutParams = params; 3279 } else { 3280 child.setLayoutParams(params); 3281 } 3282 3283 if (index < 0) { 3284 index = mChildrenCount; 3285 } 3286 3287 addInArray(child, index); 3288 3289 // tell our children 3290 if (preventRequestLayout) { 3291 child.assignParent(this); 3292 } else { 3293 child.mParent = this; 3294 } 3295 3296 if (child.hasFocus()) { 3297 requestChildFocus(child, child.findFocus()); 3298 } 3299 3300 AttachInfo ai = mAttachInfo; 3301 if (ai != null) { 3302 boolean lastKeepOn = ai.mKeepScreenOn; 3303 ai.mKeepScreenOn = false; 3304 child.dispatchAttachedToWindow(mAttachInfo, (mViewFlags&VISIBILITY_MASK)); 3305 if (ai.mKeepScreenOn) { 3306 needGlobalAttributesUpdate(true); 3307 } 3308 ai.mKeepScreenOn = lastKeepOn; 3309 } 3310 3311 onViewAdded(child); 3312 3313 if ((child.mViewFlags & DUPLICATE_PARENT_STATE) == DUPLICATE_PARENT_STATE) { 3314 mGroupFlags |= FLAG_NOTIFY_CHILDREN_ON_DRAWABLE_STATE_CHANGE; 3315 } 3316 } 3317 3318 private void addInArray(View child, int index) { 3319 View[] children = mChildren; 3320 final int count = mChildrenCount; 3321 final int size = children.length; 3322 if (index == count) { 3323 if (size == count) { 3324 mChildren = new View[size + ARRAY_CAPACITY_INCREMENT]; 3325 System.arraycopy(children, 0, mChildren, 0, size); 3326 children = mChildren; 3327 } 3328 children[mChildrenCount++] = child; 3329 } else if (index < count) { 3330 if (size == count) { 3331 mChildren = new View[size + ARRAY_CAPACITY_INCREMENT]; 3332 System.arraycopy(children, 0, mChildren, 0, index); 3333 System.arraycopy(children, index, mChildren, index + 1, count - index); 3334 children = mChildren; 3335 } else { 3336 System.arraycopy(children, index, children, index + 1, count - index); 3337 } 3338 children[index] = child; 3339 mChildrenCount++; 3340 if (mLastTouchDownIndex >= index) { 3341 mLastTouchDownIndex++; 3342 } 3343 } else { 3344 throw new IndexOutOfBoundsException("index=" + index + " count=" + count); 3345 } 3346 } 3347 3348 // This method also sets the child's mParent to null 3349 private void removeFromArray(int index) { 3350 final View[] children = mChildren; 3351 if (!(mTransitioningViews != null && mTransitioningViews.contains(children[index]))) { 3352 children[index].mParent = null; 3353 } 3354 final int count = mChildrenCount; 3355 if (index == count - 1) { 3356 children[--mChildrenCount] = null; 3357 } else if (index >= 0 && index < count) { 3358 System.arraycopy(children, index + 1, children, index, count - index - 1); 3359 children[--mChildrenCount] = null; 3360 } else { 3361 throw new IndexOutOfBoundsException(); 3362 } 3363 if (mLastTouchDownIndex == index) { 3364 mLastTouchDownTime = 0; 3365 mLastTouchDownIndex = -1; 3366 } else if (mLastTouchDownIndex > index) { 3367 mLastTouchDownIndex--; 3368 } 3369 } 3370 3371 // This method also sets the children's mParent to null 3372 private void removeFromArray(int start, int count) { 3373 final View[] children = mChildren; 3374 final int childrenCount = mChildrenCount; 3375 3376 start = Math.max(0, start); 3377 final int end = Math.min(childrenCount, start + count); 3378 3379 if (start == end) { 3380 return; 3381 } 3382 3383 if (end == childrenCount) { 3384 for (int i = start; i < end; i++) { 3385 children[i].mParent = null; 3386 children[i] = null; 3387 } 3388 } else { 3389 for (int i = start; i < end; i++) { 3390 children[i].mParent = null; 3391 } 3392 3393 // Since we're looping above, we might as well do the copy, but is arraycopy() 3394 // faster than the extra 2 bounds checks we would do in the loop? 3395 System.arraycopy(children, end, children, start, childrenCount - end); 3396 3397 for (int i = childrenCount - (end - start); i < childrenCount; i++) { 3398 children[i] = null; 3399 } 3400 } 3401 3402 mChildrenCount -= (end - start); 3403 } 3404 3405 private void bindLayoutAnimation(View child) { 3406 Animation a = mLayoutAnimationController.getAnimationForView(child); 3407 child.setAnimation(a); 3408 } 3409 3410 /** 3411 * Subclasses should override this method to set layout animation 3412 * parameters on the supplied child. 3413 * 3414 * @param child the child to associate with animation parameters 3415 * @param params the child's layout parameters which hold the animation 3416 * parameters 3417 * @param index the index of the child in the view group 3418 * @param count the number of children in the view group 3419 */ 3420 protected void attachLayoutAnimationParameters(View child, 3421 LayoutParams params, int index, int count) { 3422 LayoutAnimationController.AnimationParameters animationParams = 3423 params.layoutAnimationParameters; 3424 if (animationParams == null) { 3425 animationParams = new LayoutAnimationController.AnimationParameters(); 3426 params.layoutAnimationParameters = animationParams; 3427 } 3428 3429 animationParams.count = count; 3430 animationParams.index = index; 3431 } 3432 3433 /** 3434 * {@inheritDoc} 3435 */ 3436 public void removeView(View view) { 3437 removeViewInternal(view); 3438 requestLayout(); 3439 invalidate(true); 3440 } 3441 3442 /** 3443 * Removes a view during layout. This is useful if in your onLayout() method, 3444 * you need to remove more views. 3445 * 3446 * @param view the view to remove from the group 3447 */ 3448 public void removeViewInLayout(View view) { 3449 removeViewInternal(view); 3450 } 3451 3452 /** 3453 * Removes a range of views during layout. This is useful if in your onLayout() method, 3454 * you need to remove more views. 3455 * 3456 * @param start the index of the first view to remove from the group 3457 * @param count the number of views to remove from the group 3458 */ 3459 public void removeViewsInLayout(int start, int count) { 3460 removeViewsInternal(start, count); 3461 } 3462 3463 /** 3464 * Removes the view at the specified position in the group. 3465 * 3466 * @param index the position in the group of the view to remove 3467 */ 3468 public void removeViewAt(int index) { 3469 removeViewInternal(index, getChildAt(index)); 3470 requestLayout(); 3471 invalidate(true); 3472 } 3473 3474 /** 3475 * Removes the specified range of views from the group. 3476 * 3477 * @param start the first position in the group of the range of views to remove 3478 * @param count the number of views to remove 3479 */ 3480 public void removeViews(int start, int count) { 3481 removeViewsInternal(start, count); 3482 requestLayout(); 3483 invalidate(true); 3484 } 3485 3486 private void removeViewInternal(View view) { 3487 final int index = indexOfChild(view); 3488 if (index >= 0) { 3489 removeViewInternal(index, view); 3490 } 3491 } 3492 3493 private void removeViewInternal(int index, View view) { 3494 3495 if (mTransition != null) { 3496 mTransition.removeChild(this, view); 3497 } 3498 3499 boolean clearChildFocus = false; 3500 if (view == mFocused) { 3501 view.clearFocusForRemoval(); 3502 clearChildFocus = true; 3503 } 3504 3505 if (view.getAnimation() != null || 3506 (mTransitioningViews != null && mTransitioningViews.contains(view))) { 3507 addDisappearingView(view); 3508 } else if (view.mAttachInfo != null) { 3509 view.dispatchDetachedFromWindow(); 3510 } 3511 3512 onViewRemoved(view); 3513 3514 needGlobalAttributesUpdate(false); 3515 3516 removeFromArray(index); 3517 3518 if (clearChildFocus) { 3519 clearChildFocus(view); 3520 } 3521 } 3522 3523 /** 3524 * Sets the LayoutTransition object for this ViewGroup. If the LayoutTransition object is 3525 * not null, changes in layout which occur because of children being added to or removed from 3526 * the ViewGroup will be animated according to the animations defined in that LayoutTransition 3527 * object. By default, the transition object is null (so layout changes are not animated). 3528 * 3529 * @param transition The LayoutTransition object that will animated changes in layout. A value 3530 * of <code>null</code> means no transition will run on layout changes. 3531 * @attr ref android.R.styleable#ViewGroup_animateLayoutChanges 3532 */ 3533 public void setLayoutTransition(LayoutTransition transition) { 3534 if (mTransition != null) { 3535 mTransition.removeTransitionListener(mLayoutTransitionListener); 3536 } 3537 mTransition = transition; 3538 if (mTransition != null) { 3539 mTransition.addTransitionListener(mLayoutTransitionListener); 3540 } 3541 } 3542 3543 /** 3544 * Gets the LayoutTransition object for this ViewGroup. If the LayoutTransition object is 3545 * not null, changes in layout which occur because of children being added to or removed from 3546 * the ViewGroup will be animated according to the animations defined in that LayoutTransition 3547 * object. By default, the transition object is null (so layout changes are not animated). 3548 * 3549 * @return LayoutTranstion The LayoutTransition object that will animated changes in layout. 3550 * A value of <code>null</code> means no transition will run on layout changes. 3551 */ 3552 public LayoutTransition getLayoutTransition() { 3553 return mTransition; 3554 } 3555 3556 private void removeViewsInternal(int start, int count) { 3557 final View focused = mFocused; 3558 final boolean detach = mAttachInfo != null; 3559 View clearChildFocus = null; 3560 3561 final View[] children = mChildren; 3562 final int end = start + count; 3563 3564 for (int i = start; i < end; i++) { 3565 final View view = children[i]; 3566 3567 if (mTransition != null) { 3568 mTransition.removeChild(this, view); 3569 } 3570 3571 if (view == focused) { 3572 view.clearFocusForRemoval(); 3573 clearChildFocus = view; 3574 } 3575 3576 if (view.getAnimation() != null || 3577 (mTransitioningViews != null && mTransitioningViews.contains(view))) { 3578 addDisappearingView(view); 3579 } else if (detach) { 3580 view.dispatchDetachedFromWindow(); 3581 } 3582 3583 needGlobalAttributesUpdate(false); 3584 3585 onViewRemoved(view); 3586 } 3587 3588 removeFromArray(start, count); 3589 3590 if (clearChildFocus != null) { 3591 clearChildFocus(clearChildFocus); 3592 } 3593 } 3594 3595 /** 3596 * Call this method to remove all child views from the 3597 * ViewGroup. 3598 */ 3599 public void removeAllViews() { 3600 removeAllViewsInLayout(); 3601 requestLayout(); 3602 invalidate(true); 3603 } 3604 3605 /** 3606 * Called by a ViewGroup subclass to remove child views from itself, 3607 * when it must first know its size on screen before it can calculate how many 3608 * child views it will render. An example is a Gallery or a ListView, which 3609 * may "have" 50 children, but actually only render the number of children 3610 * that can currently fit inside the object on screen. Do not call 3611 * this method unless you are extending ViewGroup and understand the 3612 * view measuring and layout pipeline. 3613 */ 3614 public void removeAllViewsInLayout() { 3615 final int count = mChildrenCount; 3616 if (count <= 0) { 3617 return; 3618 } 3619 3620 final View[] children = mChildren; 3621 mChildrenCount = 0; 3622 3623 final View focused = mFocused; 3624 final boolean detach = mAttachInfo != null; 3625 View clearChildFocus = null; 3626 3627 needGlobalAttributesUpdate(false); 3628 3629 for (int i = count - 1; i >= 0; i--) { 3630 final View view = children[i]; 3631 3632 if (mTransition != null) { 3633 mTransition.removeChild(this, view); 3634 } 3635 3636 if (view == focused) { 3637 view.clearFocusForRemoval(); 3638 clearChildFocus = view; 3639 } 3640 3641 if (view.getAnimation() != null || 3642 (mTransitioningViews != null && mTransitioningViews.contains(view))) { 3643 addDisappearingView(view); 3644 } else if (detach) { 3645 view.dispatchDetachedFromWindow(); 3646 } 3647 3648 onViewRemoved(view); 3649 3650 view.mParent = null; 3651 children[i] = null; 3652 } 3653 3654 if (clearChildFocus != null) { 3655 clearChildFocus(clearChildFocus); 3656 } 3657 } 3658 3659 /** 3660 * Finishes the removal of a detached view. This method will dispatch the detached from 3661 * window event and notify the hierarchy change listener. 3662 * 3663 * @param child the child to be definitely removed from the view hierarchy 3664 * @param animate if true and the view has an animation, the view is placed in the 3665 * disappearing views list, otherwise, it is detached from the window 3666 * 3667 * @see #attachViewToParent(View, int, android.view.ViewGroup.LayoutParams) 3668 * @see #detachAllViewsFromParent() 3669 * @see #detachViewFromParent(View) 3670 * @see #detachViewFromParent(int) 3671 */ 3672 protected void removeDetachedView(View child, boolean animate) { 3673 if (mTransition != null) { 3674 mTransition.removeChild(this, child); 3675 } 3676 3677 if (child == mFocused) { 3678 child.clearFocus(); 3679 } 3680 3681 if ((animate && child.getAnimation() != null) || 3682 (mTransitioningViews != null && mTransitioningViews.contains(child))) { 3683 addDisappearingView(child); 3684 } else if (child.mAttachInfo != null) { 3685 child.dispatchDetachedFromWindow(); 3686 } 3687 3688 onViewRemoved(child); 3689 } 3690 3691 /** 3692 * Attaches a view to this view group. Attaching a view assigns this group as the parent, 3693 * sets the layout parameters and puts the view in the list of children so it can be retrieved 3694 * by calling {@link #getChildAt(int)}. 3695 * 3696 * This method should be called only for view which were detached from their parent. 3697 * 3698 * @param child the child to attach 3699 * @param index the index at which the child should be attached 3700 * @param params the layout parameters of the child 3701 * 3702 * @see #removeDetachedView(View, boolean) 3703 * @see #detachAllViewsFromParent() 3704 * @see #detachViewFromParent(View) 3705 * @see #detachViewFromParent(int) 3706 */ 3707 protected void attachViewToParent(View child, int index, LayoutParams params) { 3708 child.mLayoutParams = params; 3709 3710 if (index < 0) { 3711 index = mChildrenCount; 3712 } 3713 3714 addInArray(child, index); 3715 3716 child.mParent = this; 3717 child.mPrivateFlags = (child.mPrivateFlags & ~DIRTY_MASK & ~DRAWING_CACHE_VALID) | 3718 DRAWN | INVALIDATED; 3719 this.mPrivateFlags |= INVALIDATED; 3720 3721 if (child.hasFocus()) { 3722 requestChildFocus(child, child.findFocus()); 3723 } 3724 } 3725 3726 /** 3727 * Detaches a view from its parent. Detaching a view should be temporary and followed 3728 * either by a call to {@link #attachViewToParent(View, int, android.view.ViewGroup.LayoutParams)} 3729 * or a call to {@link #removeDetachedView(View, boolean)}. When a view is detached, 3730 * its parent is null and cannot be retrieved by a call to {@link #getChildAt(int)}. 3731 * 3732 * @param child the child to detach 3733 * 3734 * @see #detachViewFromParent(int) 3735 * @see #detachViewsFromParent(int, int) 3736 * @see #detachAllViewsFromParent() 3737 * @see #attachViewToParent(View, int, android.view.ViewGroup.LayoutParams) 3738 * @see #removeDetachedView(View, boolean) 3739 */ 3740 protected void detachViewFromParent(View child) { 3741 removeFromArray(indexOfChild(child)); 3742 } 3743 3744 /** 3745 * Detaches a view from its parent. Detaching a view should be temporary and followed 3746 * either by a call to {@link #attachViewToParent(View, int, android.view.ViewGroup.LayoutParams)} 3747 * or a call to {@link #removeDetachedView(View, boolean)}. When a view is detached, 3748 * its parent is null and cannot be retrieved by a call to {@link #getChildAt(int)}. 3749 * 3750 * @param index the index of the child to detach 3751 * 3752 * @see #detachViewFromParent(View) 3753 * @see #detachAllViewsFromParent() 3754 * @see #detachViewsFromParent(int, int) 3755 * @see #attachViewToParent(View, int, android.view.ViewGroup.LayoutParams) 3756 * @see #removeDetachedView(View, boolean) 3757 */ 3758 protected void detachViewFromParent(int index) { 3759 removeFromArray(index); 3760 } 3761 3762 /** 3763 * Detaches a range of view from their parent. Detaching a view should be temporary and followed 3764 * either by a call to {@link #attachViewToParent(View, int, android.view.ViewGroup.LayoutParams)} 3765 * or a call to {@link #removeDetachedView(View, boolean)}. When a view is detached, its 3766 * parent is null and cannot be retrieved by a call to {@link #getChildAt(int)}. 3767 * 3768 * @param start the first index of the childrend range to detach 3769 * @param count the number of children to detach 3770 * 3771 * @see #detachViewFromParent(View) 3772 * @see #detachViewFromParent(int) 3773 * @see #detachAllViewsFromParent() 3774 * @see #attachViewToParent(View, int, android.view.ViewGroup.LayoutParams) 3775 * @see #removeDetachedView(View, boolean) 3776 */ 3777 protected void detachViewsFromParent(int start, int count) { 3778 removeFromArray(start, count); 3779 } 3780 3781 /** 3782 * Detaches all views from the parent. Detaching a view should be temporary and followed 3783 * either by a call to {@link #attachViewToParent(View, int, android.view.ViewGroup.LayoutParams)} 3784 * or a call to {@link #removeDetachedView(View, boolean)}. When a view is detached, 3785 * its parent is null and cannot be retrieved by a call to {@link #getChildAt(int)}. 3786 * 3787 * @see #detachViewFromParent(View) 3788 * @see #detachViewFromParent(int) 3789 * @see #detachViewsFromParent(int, int) 3790 * @see #attachViewToParent(View, int, android.view.ViewGroup.LayoutParams) 3791 * @see #removeDetachedView(View, boolean) 3792 */ 3793 protected void detachAllViewsFromParent() { 3794 final int count = mChildrenCount; 3795 if (count <= 0) { 3796 return; 3797 } 3798 3799 final View[] children = mChildren; 3800 mChildrenCount = 0; 3801 3802 for (int i = count - 1; i >= 0; i--) { 3803 children[i].mParent = null; 3804 children[i] = null; 3805 } 3806 } 3807 3808 /** 3809 * Don't call or override this method. It is used for the implementation of 3810 * the view hierarchy. 3811 */ 3812 public final void invalidateChild(View child, final Rect dirty) { 3813 if (ViewDebug.TRACE_HIERARCHY) { 3814 ViewDebug.trace(this, ViewDebug.HierarchyTraceType.INVALIDATE_CHILD); 3815 } 3816 3817 ViewParent parent = this; 3818 3819 final AttachInfo attachInfo = mAttachInfo; 3820 if (attachInfo != null) { 3821 // If the child is drawing an animation, we want to copy this flag onto 3822 // ourselves and the parent to make sure the invalidate request goes 3823 // through 3824 final boolean drawAnimation = (child.mPrivateFlags & DRAW_ANIMATION) == DRAW_ANIMATION; 3825 3826 if (dirty == null) { 3827 if (child.mLayerType != LAYER_TYPE_NONE) { 3828 mPrivateFlags |= INVALIDATED; 3829 mPrivateFlags &= ~DRAWING_CACHE_VALID; 3830 child.mLocalDirtyRect.setEmpty(); 3831 } 3832 do { 3833 View view = null; 3834 if (parent instanceof View) { 3835 view = (View) parent; 3836 if (view.mLayerType != LAYER_TYPE_NONE) { 3837 view.mLocalDirtyRect.setEmpty(); 3838 if (view.getParent() instanceof View) { 3839 final View grandParent = (View) view.getParent(); 3840 grandParent.mPrivateFlags |= INVALIDATED; 3841 grandParent.mPrivateFlags &= ~DRAWING_CACHE_VALID; 3842 } 3843 } 3844 if ((view.mPrivateFlags & DIRTY_MASK) != 0) { 3845 // already marked dirty - we're done 3846 break; 3847 } 3848 } 3849 3850 if (drawAnimation) { 3851 if (view != null) { 3852 view.mPrivateFlags |= DRAW_ANIMATION; 3853 } else if (parent instanceof ViewRootImpl) { 3854 ((ViewRootImpl) parent).mIsAnimating = true; 3855 } 3856 } 3857 3858 if (parent instanceof ViewRootImpl) { 3859 ((ViewRootImpl) parent).invalidate(); 3860 parent = null; 3861 } else if (view != null) { 3862 if ((view.mPrivateFlags & DRAWN) == DRAWN || 3863 (view.mPrivateFlags & DRAWING_CACHE_VALID) == DRAWING_CACHE_VALID) { 3864 view.mPrivateFlags &= ~DRAWING_CACHE_VALID; 3865 view.mPrivateFlags |= DIRTY; 3866 parent = view.mParent; 3867 } else { 3868 parent = null; 3869 } 3870 } 3871 } while (parent != null); 3872 } else { 3873 // Check whether the child that requests the invalidate is fully opaque 3874 final boolean isOpaque = child.isOpaque() && !drawAnimation && 3875 child.getAnimation() == null; 3876 // Mark the child as dirty, using the appropriate flag 3877 // Make sure we do not set both flags at the same time 3878 int opaqueFlag = isOpaque ? DIRTY_OPAQUE : DIRTY; 3879 3880 if (child.mLayerType != LAYER_TYPE_NONE) { 3881 mPrivateFlags |= INVALIDATED; 3882 mPrivateFlags &= ~DRAWING_CACHE_VALID; 3883 child.mLocalDirtyRect.union(dirty); 3884 } 3885 3886 final int[] location = attachInfo.mInvalidateChildLocation; 3887 location[CHILD_LEFT_INDEX] = child.mLeft; 3888 location[CHILD_TOP_INDEX] = child.mTop; 3889 Matrix childMatrix = child.getMatrix(); 3890 if (!childMatrix.isIdentity()) { 3891 RectF boundingRect = attachInfo.mTmpTransformRect; 3892 boundingRect.set(dirty); 3893 //boundingRect.inset(-0.5f, -0.5f); 3894 childMatrix.mapRect(boundingRect); 3895 dirty.set((int) (boundingRect.left - 0.5f), 3896 (int) (boundingRect.top - 0.5f), 3897 (int) (boundingRect.right + 0.5f), 3898 (int) (boundingRect.bottom + 0.5f)); 3899 } 3900 3901 do { 3902 View view = null; 3903 if (parent instanceof View) { 3904 view = (View) parent; 3905 if (view.mLayerType != LAYER_TYPE_NONE && 3906 view.getParent() instanceof View) { 3907 final View grandParent = (View) view.getParent(); 3908 grandParent.mPrivateFlags |= INVALIDATED; 3909 grandParent.mPrivateFlags &= ~DRAWING_CACHE_VALID; 3910 } 3911 } 3912 3913 if (drawAnimation) { 3914 if (view != null) { 3915 view.mPrivateFlags |= DRAW_ANIMATION; 3916 } else if (parent instanceof ViewRootImpl) { 3917 ((ViewRootImpl) parent).mIsAnimating = true; 3918 } 3919 } 3920 3921 // If the parent is dirty opaque or not dirty, mark it dirty with the opaque 3922 // flag coming from the child that initiated the invalidate 3923 if (view != null) { 3924 if ((view.mViewFlags & FADING_EDGE_MASK) != 0 && 3925 view.getSolidColor() == 0) { 3926 opaqueFlag = DIRTY; 3927 } 3928 if ((view.mPrivateFlags & DIRTY_MASK) != DIRTY) { 3929 view.mPrivateFlags = (view.mPrivateFlags & ~DIRTY_MASK) | opaqueFlag; 3930 } 3931 } 3932 3933 parent = parent.invalidateChildInParent(location, dirty); 3934 if (view != null) { 3935 // Account for transform on current parent 3936 Matrix m = view.getMatrix(); 3937 if (!m.isIdentity()) { 3938 RectF boundingRect = attachInfo.mTmpTransformRect; 3939 boundingRect.set(dirty); 3940 m.mapRect(boundingRect); 3941 dirty.set((int) boundingRect.left, (int) boundingRect.top, 3942 (int) (boundingRect.right + 0.5f), 3943 (int) (boundingRect.bottom + 0.5f)); 3944 } 3945 } 3946 } while (parent != null); 3947 } 3948 } 3949 } 3950 3951 /** 3952 * Don't call or override this method. It is used for the implementation of 3953 * the view hierarchy. 3954 * 3955 * This implementation returns null if this ViewGroup does not have a parent, 3956 * if this ViewGroup is already fully invalidated or if the dirty rectangle 3957 * does not intersect with this ViewGroup's bounds. 3958 */ 3959 public ViewParent invalidateChildInParent(final int[] location, final Rect dirty) { 3960 if (ViewDebug.TRACE_HIERARCHY) { 3961 ViewDebug.trace(this, ViewDebug.HierarchyTraceType.INVALIDATE_CHILD_IN_PARENT); 3962 } 3963 3964 if ((mPrivateFlags & DRAWN) == DRAWN || 3965 (mPrivateFlags & DRAWING_CACHE_VALID) == DRAWING_CACHE_VALID) { 3966 if ((mGroupFlags & (FLAG_OPTIMIZE_INVALIDATE | FLAG_ANIMATION_DONE)) != 3967 FLAG_OPTIMIZE_INVALIDATE) { 3968 dirty.offset(location[CHILD_LEFT_INDEX] - mScrollX, 3969 location[CHILD_TOP_INDEX] - mScrollY); 3970 3971 final int left = mLeft; 3972 final int top = mTop; 3973 3974 if ((mGroupFlags & FLAG_CLIP_CHILDREN) != FLAG_CLIP_CHILDREN || 3975 dirty.intersect(0, 0, mRight - left, mBottom - top) || 3976 (mPrivateFlags & DRAW_ANIMATION) == DRAW_ANIMATION) { 3977 mPrivateFlags &= ~DRAWING_CACHE_VALID; 3978 3979 location[CHILD_LEFT_INDEX] = left; 3980 location[CHILD_TOP_INDEX] = top; 3981 3982 if (mLayerType != LAYER_TYPE_NONE) { 3983 mLocalDirtyRect.union(dirty); 3984 } 3985 3986 return mParent; 3987 } 3988 } else { 3989 mPrivateFlags &= ~DRAWN & ~DRAWING_CACHE_VALID; 3990 3991 location[CHILD_LEFT_INDEX] = mLeft; 3992 location[CHILD_TOP_INDEX] = mTop; 3993 if ((mGroupFlags & FLAG_CLIP_CHILDREN) == FLAG_CLIP_CHILDREN) { 3994 dirty.set(0, 0, mRight - mLeft, mBottom - mTop); 3995 } else { 3996 // in case the dirty rect extends outside the bounds of this container 3997 dirty.union(0, 0, mRight - mLeft, mBottom - mTop); 3998 } 3999 4000 if (mLayerType != LAYER_TYPE_NONE) { 4001 mLocalDirtyRect.union(dirty); 4002 } 4003 4004 return mParent; 4005 } 4006 } 4007 4008 return null; 4009 } 4010 4011 /** 4012 * Offset a rectangle that is in a descendant's coordinate 4013 * space into our coordinate space. 4014 * @param descendant A descendant of this view 4015 * @param rect A rectangle defined in descendant's coordinate space. 4016 */ 4017 public final void offsetDescendantRectToMyCoords(View descendant, Rect rect) { 4018 offsetRectBetweenParentAndChild(descendant, rect, true, false); 4019 } 4020 4021 /** 4022 * Offset a rectangle that is in our coordinate space into an ancestor's 4023 * coordinate space. 4024 * @param descendant A descendant of this view 4025 * @param rect A rectangle defined in descendant's coordinate space. 4026 */ 4027 public final void offsetRectIntoDescendantCoords(View descendant, Rect rect) { 4028 offsetRectBetweenParentAndChild(descendant, rect, false, false); 4029 } 4030 4031 /** 4032 * Helper method that offsets a rect either from parent to descendant or 4033 * descendant to parent. 4034 */ 4035 void offsetRectBetweenParentAndChild(View descendant, Rect rect, 4036 boolean offsetFromChildToParent, boolean clipToBounds) { 4037 4038 // already in the same coord system :) 4039 if (descendant == this) { 4040 return; 4041 } 4042 4043 ViewParent theParent = descendant.mParent; 4044 4045 // search and offset up to the parent 4046 while ((theParent != null) 4047 && (theParent instanceof View) 4048 && (theParent != this)) { 4049 4050 if (offsetFromChildToParent) { 4051 rect.offset(descendant.mLeft - descendant.mScrollX, 4052 descendant.mTop - descendant.mScrollY); 4053 if (clipToBounds) { 4054 View p = (View) theParent; 4055 rect.intersect(0, 0, p.mRight - p.mLeft, p.mBottom - p.mTop); 4056 } 4057 } else { 4058 if (clipToBounds) { 4059 View p = (View) theParent; 4060 rect.intersect(0, 0, p.mRight - p.mLeft, p.mBottom - p.mTop); 4061 } 4062 rect.offset(descendant.mScrollX - descendant.mLeft, 4063 descendant.mScrollY - descendant.mTop); 4064 } 4065 4066 descendant = (View) theParent; 4067 theParent = descendant.mParent; 4068 } 4069 4070 // now that we are up to this view, need to offset one more time 4071 // to get into our coordinate space 4072 if (theParent == this) { 4073 if (offsetFromChildToParent) { 4074 rect.offset(descendant.mLeft - descendant.mScrollX, 4075 descendant.mTop - descendant.mScrollY); 4076 } else { 4077 rect.offset(descendant.mScrollX - descendant.mLeft, 4078 descendant.mScrollY - descendant.mTop); 4079 } 4080 } else { 4081 throw new IllegalArgumentException("parameter must be a descendant of this view"); 4082 } 4083 } 4084 4085 /** 4086 * Offset the vertical location of all children of this view by the specified number of pixels. 4087 * 4088 * @param offset the number of pixels to offset 4089 * 4090 * @hide 4091 */ 4092 public void offsetChildrenTopAndBottom(int offset) { 4093 final int count = mChildrenCount; 4094 final View[] children = mChildren; 4095 4096 for (int i = 0; i < count; i++) { 4097 final View v = children[i]; 4098 v.mTop += offset; 4099 v.mBottom += offset; 4100 } 4101 } 4102 4103 /** 4104 * {@inheritDoc} 4105 */ 4106 public boolean getChildVisibleRect(View child, Rect r, android.graphics.Point offset) { 4107 int dx = child.mLeft - mScrollX; 4108 int dy = child.mTop - mScrollY; 4109 if (offset != null) { 4110 offset.x += dx; 4111 offset.y += dy; 4112 } 4113 r.offset(dx, dy); 4114 return r.intersect(0, 0, mRight - mLeft, mBottom - mTop) && 4115 (mParent == null || mParent.getChildVisibleRect(this, r, offset)); 4116 } 4117 4118 /** 4119 * {@inheritDoc} 4120 */ 4121 @Override 4122 public final void layout(int l, int t, int r, int b) { 4123 if (mTransition == null || !mTransition.isChangingLayout()) { 4124 super.layout(l, t, r, b); 4125 } else { 4126 // record the fact that we noop'd it; request layout when transition finishes 4127 mLayoutSuppressed = true; 4128 } 4129 } 4130 4131 /** 4132 * {@inheritDoc} 4133 */ 4134 @Override 4135 protected abstract void onLayout(boolean changed, 4136 int l, int t, int r, int b); 4137 4138 /** 4139 * Indicates whether the view group has the ability to animate its children 4140 * after the first layout. 4141 * 4142 * @return true if the children can be animated, false otherwise 4143 */ 4144 protected boolean canAnimate() { 4145 return mLayoutAnimationController != null; 4146 } 4147 4148 /** 4149 * Runs the layout animation. Calling this method triggers a relayout of 4150 * this view group. 4151 */ 4152 public void startLayoutAnimation() { 4153 if (mLayoutAnimationController != null) { 4154 mGroupFlags |= FLAG_RUN_ANIMATION; 4155 requestLayout(); 4156 } 4157 } 4158 4159 /** 4160 * Schedules the layout animation to be played after the next layout pass 4161 * of this view group. This can be used to restart the layout animation 4162 * when the content of the view group changes or when the activity is 4163 * paused and resumed. 4164 */ 4165 public void scheduleLayoutAnimation() { 4166 mGroupFlags |= FLAG_RUN_ANIMATION; 4167 } 4168 4169 /** 4170 * Sets the layout animation controller used to animate the group's 4171 * children after the first layout. 4172 * 4173 * @param controller the animation controller 4174 */ 4175 public void setLayoutAnimation(LayoutAnimationController controller) { 4176 mLayoutAnimationController = controller; 4177 if (mLayoutAnimationController != null) { 4178 mGroupFlags |= FLAG_RUN_ANIMATION; 4179 } 4180 } 4181 4182 /** 4183 * Returns the layout animation controller used to animate the group's 4184 * children. 4185 * 4186 * @return the current animation controller 4187 */ 4188 public LayoutAnimationController getLayoutAnimation() { 4189 return mLayoutAnimationController; 4190 } 4191 4192 /** 4193 * Indicates whether the children's drawing cache is used during a layout 4194 * animation. By default, the drawing cache is enabled but this will prevent 4195 * nested layout animations from working. To nest animations, you must disable 4196 * the cache. 4197 * 4198 * @return true if the animation cache is enabled, false otherwise 4199 * 4200 * @see #setAnimationCacheEnabled(boolean) 4201 * @see View#setDrawingCacheEnabled(boolean) 4202 */ 4203 @ViewDebug.ExportedProperty 4204 public boolean isAnimationCacheEnabled() { 4205 return (mGroupFlags & FLAG_ANIMATION_CACHE) == FLAG_ANIMATION_CACHE; 4206 } 4207 4208 /** 4209 * Enables or disables the children's drawing cache during a layout animation. 4210 * By default, the drawing cache is enabled but this will prevent nested 4211 * layout animations from working. To nest animations, you must disable the 4212 * cache. 4213 * 4214 * @param enabled true to enable the animation cache, false otherwise 4215 * 4216 * @see #isAnimationCacheEnabled() 4217 * @see View#setDrawingCacheEnabled(boolean) 4218 */ 4219 public void setAnimationCacheEnabled(boolean enabled) { 4220 setBooleanFlag(FLAG_ANIMATION_CACHE, enabled); 4221 } 4222 4223 /** 4224 * Indicates whether this ViewGroup will always try to draw its children using their 4225 * drawing cache. By default this property is enabled. 4226 * 4227 * @return true if the animation cache is enabled, false otherwise 4228 * 4229 * @see #setAlwaysDrawnWithCacheEnabled(boolean) 4230 * @see #setChildrenDrawnWithCacheEnabled(boolean) 4231 * @see View#setDrawingCacheEnabled(boolean) 4232 */ 4233 @ViewDebug.ExportedProperty(category = "drawing") 4234 public boolean isAlwaysDrawnWithCacheEnabled() { 4235 return (mGroupFlags & FLAG_ALWAYS_DRAWN_WITH_CACHE) == FLAG_ALWAYS_DRAWN_WITH_CACHE; 4236 } 4237 4238 /** 4239 * Indicates whether this ViewGroup will always try to draw its children using their 4240 * drawing cache. This property can be set to true when the cache rendering is 4241 * slightly different from the children's normal rendering. Renderings can be different, 4242 * for instance, when the cache's quality is set to low. 4243 * 4244 * When this property is disabled, the ViewGroup will use the drawing cache of its 4245 * children only when asked to. It's usually the task of subclasses to tell ViewGroup 4246 * when to start using the drawing cache and when to stop using it. 4247 * 4248 * @param always true to always draw with the drawing cache, false otherwise 4249 * 4250 * @see #isAlwaysDrawnWithCacheEnabled() 4251 * @see #setChildrenDrawnWithCacheEnabled(boolean) 4252 * @see View#setDrawingCacheEnabled(boolean) 4253 * @see View#setDrawingCacheQuality(int) 4254 */ 4255 public void setAlwaysDrawnWithCacheEnabled(boolean always) { 4256 setBooleanFlag(FLAG_ALWAYS_DRAWN_WITH_CACHE, always); 4257 } 4258 4259 /** 4260 * Indicates whether the ViewGroup is currently drawing its children using 4261 * their drawing cache. 4262 * 4263 * @return true if children should be drawn with their cache, false otherwise 4264 * 4265 * @see #setAlwaysDrawnWithCacheEnabled(boolean) 4266 * @see #setChildrenDrawnWithCacheEnabled(boolean) 4267 */ 4268 @ViewDebug.ExportedProperty(category = "drawing") 4269 protected boolean isChildrenDrawnWithCacheEnabled() { 4270 return (mGroupFlags & FLAG_CHILDREN_DRAWN_WITH_CACHE) == FLAG_CHILDREN_DRAWN_WITH_CACHE; 4271 } 4272 4273 /** 4274 * Tells the ViewGroup to draw its children using their drawing cache. This property 4275 * is ignored when {@link #isAlwaysDrawnWithCacheEnabled()} is true. A child's drawing cache 4276 * will be used only if it has been enabled. 4277 * 4278 * Subclasses should call this method to start and stop using the drawing cache when 4279 * they perform performance sensitive operations, like scrolling or animating. 4280 * 4281 * @param enabled true if children should be drawn with their cache, false otherwise 4282 * 4283 * @see #setAlwaysDrawnWithCacheEnabled(boolean) 4284 * @see #isChildrenDrawnWithCacheEnabled() 4285 */ 4286 protected void setChildrenDrawnWithCacheEnabled(boolean enabled) { 4287 setBooleanFlag(FLAG_CHILDREN_DRAWN_WITH_CACHE, enabled); 4288 } 4289 4290 /** 4291 * Indicates whether the ViewGroup is drawing its children in the order defined by 4292 * {@link #getChildDrawingOrder(int, int)}. 4293 * 4294 * @return true if children drawing order is defined by {@link #getChildDrawingOrder(int, int)}, 4295 * false otherwise 4296 * 4297 * @see #setChildrenDrawingOrderEnabled(boolean) 4298 * @see #getChildDrawingOrder(int, int) 4299 */ 4300 @ViewDebug.ExportedProperty(category = "drawing") 4301 protected boolean isChildrenDrawingOrderEnabled() { 4302 return (mGroupFlags & FLAG_USE_CHILD_DRAWING_ORDER) == FLAG_USE_CHILD_DRAWING_ORDER; 4303 } 4304 4305 /** 4306 * Tells the ViewGroup whether to draw its children in the order defined by the method 4307 * {@link #getChildDrawingOrder(int, int)}. 4308 * 4309 * @param enabled true if the order of the children when drawing is determined by 4310 * {@link #getChildDrawingOrder(int, int)}, false otherwise 4311 * 4312 * @see #isChildrenDrawingOrderEnabled() 4313 * @see #getChildDrawingOrder(int, int) 4314 */ 4315 protected void setChildrenDrawingOrderEnabled(boolean enabled) { 4316 setBooleanFlag(FLAG_USE_CHILD_DRAWING_ORDER, enabled); 4317 } 4318 4319 private void setBooleanFlag(int flag, boolean value) { 4320 if (value) { 4321 mGroupFlags |= flag; 4322 } else { 4323 mGroupFlags &= ~flag; 4324 } 4325 } 4326 4327 /** 4328 * Returns an integer indicating what types of drawing caches are kept in memory. 4329 * 4330 * @see #setPersistentDrawingCache(int) 4331 * @see #setAnimationCacheEnabled(boolean) 4332 * 4333 * @return one or a combination of {@link #PERSISTENT_NO_CACHE}, 4334 * {@link #PERSISTENT_ANIMATION_CACHE}, {@link #PERSISTENT_SCROLLING_CACHE} 4335 * and {@link #PERSISTENT_ALL_CACHES} 4336 */ 4337 @ViewDebug.ExportedProperty(category = "drawing", mapping = { 4338 @ViewDebug.IntToString(from = PERSISTENT_NO_CACHE, to = "NONE"), 4339 @ViewDebug.IntToString(from = PERSISTENT_ANIMATION_CACHE, to = "ANIMATION"), 4340 @ViewDebug.IntToString(from = PERSISTENT_SCROLLING_CACHE, to = "SCROLLING"), 4341 @ViewDebug.IntToString(from = PERSISTENT_ALL_CACHES, to = "ALL") 4342 }) 4343 public int getPersistentDrawingCache() { 4344 return mPersistentDrawingCache; 4345 } 4346 4347 /** 4348 * Indicates what types of drawing caches should be kept in memory after 4349 * they have been created. 4350 * 4351 * @see #getPersistentDrawingCache() 4352 * @see #setAnimationCacheEnabled(boolean) 4353 * 4354 * @param drawingCacheToKeep one or a combination of {@link #PERSISTENT_NO_CACHE}, 4355 * {@link #PERSISTENT_ANIMATION_CACHE}, {@link #PERSISTENT_SCROLLING_CACHE} 4356 * and {@link #PERSISTENT_ALL_CACHES} 4357 */ 4358 public void setPersistentDrawingCache(int drawingCacheToKeep) { 4359 mPersistentDrawingCache = drawingCacheToKeep & PERSISTENT_ALL_CACHES; 4360 } 4361 4362 /** 4363 * Returns a new set of layout parameters based on the supplied attributes set. 4364 * 4365 * @param attrs the attributes to build the layout parameters from 4366 * 4367 * @return an instance of {@link android.view.ViewGroup.LayoutParams} or one 4368 * of its descendants 4369 */ 4370 public LayoutParams generateLayoutParams(AttributeSet attrs) { 4371 return new LayoutParams(getContext(), attrs); 4372 } 4373 4374 /** 4375 * Returns a safe set of layout parameters based on the supplied layout params. 4376 * When a ViewGroup is passed a View whose layout params do not pass the test of 4377 * {@link #checkLayoutParams(android.view.ViewGroup.LayoutParams)}, this method 4378 * is invoked. This method should return a new set of layout params suitable for 4379 * this ViewGroup, possibly by copying the appropriate attributes from the 4380 * specified set of layout params. 4381 * 4382 * @param p The layout parameters to convert into a suitable set of layout parameters 4383 * for this ViewGroup. 4384 * 4385 * @return an instance of {@link android.view.ViewGroup.LayoutParams} or one 4386 * of its descendants 4387 */ 4388 protected LayoutParams generateLayoutParams(ViewGroup.LayoutParams p) { 4389 return p; 4390 } 4391 4392 /** 4393 * Returns a set of default layout parameters. These parameters are requested 4394 * when the View passed to {@link #addView(View)} has no layout parameters 4395 * already set. If null is returned, an exception is thrown from addView. 4396 * 4397 * @return a set of default layout parameters or null 4398 */ 4399 protected LayoutParams generateDefaultLayoutParams() { 4400 return new LayoutParams(LayoutParams.WRAP_CONTENT, LayoutParams.WRAP_CONTENT); 4401 } 4402 4403 /** 4404 * @hide 4405 */ 4406 @Override 4407 protected boolean dispatchConsistencyCheck(int consistency) { 4408 boolean result = super.dispatchConsistencyCheck(consistency); 4409 4410 final int count = mChildrenCount; 4411 final View[] children = mChildren; 4412 for (int i = 0; i < count; i++) { 4413 if (!children[i].dispatchConsistencyCheck(consistency)) result = false; 4414 } 4415 4416 return result; 4417 } 4418 4419 /** 4420 * @hide 4421 */ 4422 @Override 4423 protected boolean onConsistencyCheck(int consistency) { 4424 boolean result = super.onConsistencyCheck(consistency); 4425 4426 final boolean checkLayout = (consistency & ViewDebug.CONSISTENCY_LAYOUT) != 0; 4427 final boolean checkDrawing = (consistency & ViewDebug.CONSISTENCY_DRAWING) != 0; 4428 4429 if (checkLayout) { 4430 final int count = mChildrenCount; 4431 final View[] children = mChildren; 4432 for (int i = 0; i < count; i++) { 4433 if (children[i].getParent() != this) { 4434 result = false; 4435 android.util.Log.d(ViewDebug.CONSISTENCY_LOG_TAG, 4436 "View " + children[i] + " has no parent/a parent that is not " + this); 4437 } 4438 } 4439 } 4440 4441 if (checkDrawing) { 4442 // If this group is dirty, check that the parent is dirty as well 4443 if ((mPrivateFlags & DIRTY_MASK) != 0) { 4444 final ViewParent parent = getParent(); 4445 if (parent != null && !(parent instanceof ViewRootImpl)) { 4446 if ((((View) parent).mPrivateFlags & DIRTY_MASK) == 0) { 4447 result = false; 4448 android.util.Log.d(ViewDebug.CONSISTENCY_LOG_TAG, 4449 "ViewGroup " + this + " is dirty but its parent is not: " + this); 4450 } 4451 } 4452 } 4453 } 4454 4455 return result; 4456 } 4457 4458 /** 4459 * {@inheritDoc} 4460 */ 4461 @Override 4462 protected void debug(int depth) { 4463 super.debug(depth); 4464 String output; 4465 4466 if (mFocused != null) { 4467 output = debugIndent(depth); 4468 output += "mFocused"; 4469 Log.d(VIEW_LOG_TAG, output); 4470 } 4471 if (mChildrenCount != 0) { 4472 output = debugIndent(depth); 4473 output += "{"; 4474 Log.d(VIEW_LOG_TAG, output); 4475 } 4476 int count = mChildrenCount; 4477 for (int i = 0; i < count; i++) { 4478 View child = mChildren[i]; 4479 child.debug(depth + 1); 4480 } 4481 4482 if (mChildrenCount != 0) { 4483 output = debugIndent(depth); 4484 output += "}"; 4485 Log.d(VIEW_LOG_TAG, output); 4486 } 4487 } 4488 4489 /** 4490 * Returns the position in the group of the specified child view. 4491 * 4492 * @param child the view for which to get the position 4493 * @return a positive integer representing the position of the view in the 4494 * group, or -1 if the view does not exist in the group 4495 */ 4496 public int indexOfChild(View child) { 4497 final int count = mChildrenCount; 4498 final View[] children = mChildren; 4499 for (int i = 0; i < count; i++) { 4500 if (children[i] == child) { 4501 return i; 4502 } 4503 } 4504 return -1; 4505 } 4506 4507 /** 4508 * Returns the number of children in the group. 4509 * 4510 * @return a positive integer representing the number of children in 4511 * the group 4512 */ 4513 public int getChildCount() { 4514 return mChildrenCount; 4515 } 4516 4517 /** 4518 * Returns the view at the specified position in the group. 4519 * 4520 * @param index the position at which to get the view from 4521 * @return the view at the specified position or null if the position 4522 * does not exist within the group 4523 */ 4524 public View getChildAt(int index) { 4525 if (index < 0 || index >= mChildrenCount) { 4526 return null; 4527 } 4528 return mChildren[index]; 4529 } 4530 4531 /** 4532 * Ask all of the children of this view to measure themselves, taking into 4533 * account both the MeasureSpec requirements for this view and its padding. 4534 * We skip children that are in the GONE state The heavy lifting is done in 4535 * getChildMeasureSpec. 4536 * 4537 * @param widthMeasureSpec The width requirements for this view 4538 * @param heightMeasureSpec The height requirements for this view 4539 */ 4540 protected void measureChildren(int widthMeasureSpec, int heightMeasureSpec) { 4541 final int size = mChildrenCount; 4542 final View[] children = mChildren; 4543 for (int i = 0; i < size; ++i) { 4544 final View child = children[i]; 4545 if ((child.mViewFlags & VISIBILITY_MASK) != GONE) { 4546 measureChild(child, widthMeasureSpec, heightMeasureSpec); 4547 } 4548 } 4549 } 4550 4551 /** 4552 * Ask one of the children of this view to measure itself, taking into 4553 * account both the MeasureSpec requirements for this view and its padding. 4554 * The heavy lifting is done in getChildMeasureSpec. 4555 * 4556 * @param child The child to measure 4557 * @param parentWidthMeasureSpec The width requirements for this view 4558 * @param parentHeightMeasureSpec The height requirements for this view 4559 */ 4560 protected void measureChild(View child, int parentWidthMeasureSpec, 4561 int parentHeightMeasureSpec) { 4562 final LayoutParams lp = child.getLayoutParams(); 4563 4564 final int childWidthMeasureSpec = getChildMeasureSpec(parentWidthMeasureSpec, 4565 mPaddingLeft + mPaddingRight, lp.width); 4566 final int childHeightMeasureSpec = getChildMeasureSpec(parentHeightMeasureSpec, 4567 mPaddingTop + mPaddingBottom, lp.height); 4568 4569 child.measure(childWidthMeasureSpec, childHeightMeasureSpec); 4570 } 4571 4572 /** 4573 * Ask one of the children of this view to measure itself, taking into 4574 * account both the MeasureSpec requirements for this view and its padding 4575 * and margins. The child must have MarginLayoutParams The heavy lifting is 4576 * done in getChildMeasureSpec. 4577 * 4578 * @param child The child to measure 4579 * @param parentWidthMeasureSpec The width requirements for this view 4580 * @param widthUsed Extra space that has been used up by the parent 4581 * horizontally (possibly by other children of the parent) 4582 * @param parentHeightMeasureSpec The height requirements for this view 4583 * @param heightUsed Extra space that has been used up by the parent 4584 * vertically (possibly by other children of the parent) 4585 */ 4586 protected void measureChildWithMargins(View child, 4587 int parentWidthMeasureSpec, int widthUsed, 4588 int parentHeightMeasureSpec, int heightUsed) { 4589 final MarginLayoutParams lp = (MarginLayoutParams) child.getLayoutParams(); 4590 4591 final int childWidthMeasureSpec = getChildMeasureSpec(parentWidthMeasureSpec, 4592 mPaddingLeft + mPaddingRight + lp.leftMargin + lp.rightMargin 4593 + widthUsed, lp.width); 4594 final int childHeightMeasureSpec = getChildMeasureSpec(parentHeightMeasureSpec, 4595 mPaddingTop + mPaddingBottom + lp.topMargin + lp.bottomMargin 4596 + heightUsed, lp.height); 4597 4598 child.measure(childWidthMeasureSpec, childHeightMeasureSpec); 4599 } 4600 4601 /** 4602 * Does the hard part of measureChildren: figuring out the MeasureSpec to 4603 * pass to a particular child. This method figures out the right MeasureSpec 4604 * for one dimension (height or width) of one child view. 4605 * 4606 * The goal is to combine information from our MeasureSpec with the 4607 * LayoutParams of the child to get the best possible results. For example, 4608 * if the this view knows its size (because its MeasureSpec has a mode of 4609 * EXACTLY), and the child has indicated in its LayoutParams that it wants 4610 * to be the same size as the parent, the parent should ask the child to 4611 * layout given an exact size. 4612 * 4613 * @param spec The requirements for this view 4614 * @param padding The padding of this view for the current dimension and 4615 * margins, if applicable 4616 * @param childDimension How big the child wants to be in the current 4617 * dimension 4618 * @return a MeasureSpec integer for the child 4619 */ 4620 public static int getChildMeasureSpec(int spec, int padding, int childDimension) { 4621 int specMode = MeasureSpec.getMode(spec); 4622 int specSize = MeasureSpec.getSize(spec); 4623 4624 int size = Math.max(0, specSize - padding); 4625 4626 int resultSize = 0; 4627 int resultMode = 0; 4628 4629 switch (specMode) { 4630 // Parent has imposed an exact size on us 4631 case MeasureSpec.EXACTLY: 4632 if (childDimension >= 0) { 4633 resultSize = childDimension; 4634 resultMode = MeasureSpec.EXACTLY; 4635 } else if (childDimension == LayoutParams.MATCH_PARENT) { 4636 // Child wants to be our size. So be it. 4637 resultSize = size; 4638 resultMode = MeasureSpec.EXACTLY; 4639 } else if (childDimension == LayoutParams.WRAP_CONTENT) { 4640 // Child wants to determine its own size. It can't be 4641 // bigger than us. 4642 resultSize = size; 4643 resultMode = MeasureSpec.AT_MOST; 4644 } 4645 break; 4646 4647 // Parent has imposed a maximum size on us 4648 case MeasureSpec.AT_MOST: 4649 if (childDimension >= 0) { 4650 // Child wants a specific size... so be it 4651 resultSize = childDimension; 4652 resultMode = MeasureSpec.EXACTLY; 4653 } else if (childDimension == LayoutParams.MATCH_PARENT) { 4654 // Child wants to be our size, but our size is not fixed. 4655 // Constrain child to not be bigger than us. 4656 resultSize = size; 4657 resultMode = MeasureSpec.AT_MOST; 4658 } else if (childDimension == LayoutParams.WRAP_CONTENT) { 4659 // Child wants to determine its own size. It can't be 4660 // bigger than us. 4661 resultSize = size; 4662 resultMode = MeasureSpec.AT_MOST; 4663 } 4664 break; 4665 4666 // Parent asked to see how big we want to be 4667 case MeasureSpec.UNSPECIFIED: 4668 if (childDimension >= 0) { 4669 // Child wants a specific size... let him have it 4670 resultSize = childDimension; 4671 resultMode = MeasureSpec.EXACTLY; 4672 } else if (childDimension == LayoutParams.MATCH_PARENT) { 4673 // Child wants to be our size... find out how big it should 4674 // be 4675 resultSize = 0; 4676 resultMode = MeasureSpec.UNSPECIFIED; 4677 } else if (childDimension == LayoutParams.WRAP_CONTENT) { 4678 // Child wants to determine its own size.... find out how 4679 // big it should be 4680 resultSize = 0; 4681 resultMode = MeasureSpec.UNSPECIFIED; 4682 } 4683 break; 4684 } 4685 return MeasureSpec.makeMeasureSpec(resultSize, resultMode); 4686 } 4687 4688 4689 /** 4690 * Removes any pending animations for views that have been removed. Call 4691 * this if you don't want animations for exiting views to stack up. 4692 */ 4693 public void clearDisappearingChildren() { 4694 if (mDisappearingChildren != null) { 4695 mDisappearingChildren.clear(); 4696 } 4697 } 4698 4699 /** 4700 * Add a view which is removed from mChildren but still needs animation 4701 * 4702 * @param v View to add 4703 */ 4704 private void addDisappearingView(View v) { 4705 ArrayList<View> disappearingChildren = mDisappearingChildren; 4706 4707 if (disappearingChildren == null) { 4708 disappearingChildren = mDisappearingChildren = new ArrayList<View>(); 4709 } 4710 4711 disappearingChildren.add(v); 4712 } 4713 4714 /** 4715 * Cleanup a view when its animation is done. This may mean removing it from 4716 * the list of disappearing views. 4717 * 4718 * @param view The view whose animation has finished 4719 * @param animation The animation, cannot be null 4720 */ 4721 private void finishAnimatingView(final View view, Animation animation) { 4722 final ArrayList<View> disappearingChildren = mDisappearingChildren; 4723 if (disappearingChildren != null) { 4724 if (disappearingChildren.contains(view)) { 4725 disappearingChildren.remove(view); 4726 4727 if (view.mAttachInfo != null) { 4728 view.dispatchDetachedFromWindow(); 4729 } 4730 4731 view.clearAnimation(); 4732 mGroupFlags |= FLAG_INVALIDATE_REQUIRED; 4733 } 4734 } 4735 4736 if (animation != null && !animation.getFillAfter()) { 4737 view.clearAnimation(); 4738 } 4739 4740 if ((view.mPrivateFlags & ANIMATION_STARTED) == ANIMATION_STARTED) { 4741 view.onAnimationEnd(); 4742 // Should be performed by onAnimationEnd() but this avoid an infinite loop, 4743 // so we'd rather be safe than sorry 4744 view.mPrivateFlags &= ~ANIMATION_STARTED; 4745 // Draw one more frame after the animation is done 4746 mGroupFlags |= FLAG_INVALIDATE_REQUIRED; 4747 } 4748 } 4749 4750 /** 4751 * This method tells the ViewGroup that the given View object, which should have this 4752 * ViewGroup as its parent, 4753 * should be kept around (re-displayed when the ViewGroup draws its children) even if it 4754 * is removed from its parent. This allows animations, such as those used by 4755 * {@link android.app.Fragment} and {@link android.animation.LayoutTransition} to animate 4756 * the removal of views. A call to this method should always be accompanied by a later call 4757 * to {@link #endViewTransition(View)}, such as after an animation on the View has finished, 4758 * so that the View finally gets removed. 4759 * 4760 * @param view The View object to be kept visible even if it gets removed from its parent. 4761 */ 4762 public void startViewTransition(View view) { 4763 if (view.mParent == this) { 4764 if (mTransitioningViews == null) { 4765 mTransitioningViews = new ArrayList<View>(); 4766 } 4767 mTransitioningViews.add(view); 4768 } 4769 } 4770 4771 /** 4772 * This method should always be called following an earlier call to 4773 * {@link #startViewTransition(View)}. The given View is finally removed from its parent 4774 * and will no longer be displayed. Note that this method does not perform the functionality 4775 * of removing a view from its parent; it just discontinues the display of a View that 4776 * has previously been removed. 4777 * 4778 * @return view The View object that has been removed but is being kept around in the visible 4779 * hierarchy by an earlier call to {@link #startViewTransition(View)}. 4780 */ 4781 public void endViewTransition(View view) { 4782 if (mTransitioningViews != null) { 4783 mTransitioningViews.remove(view); 4784 final ArrayList<View> disappearingChildren = mDisappearingChildren; 4785 if (disappearingChildren != null && disappearingChildren.contains(view)) { 4786 disappearingChildren.remove(view); 4787 if (mVisibilityChangingChildren != null && 4788 mVisibilityChangingChildren.contains(view)) { 4789 mVisibilityChangingChildren.remove(view); 4790 } else { 4791 if (view.mAttachInfo != null) { 4792 view.dispatchDetachedFromWindow(); 4793 } 4794 if (view.mParent != null) { 4795 view.mParent = null; 4796 } 4797 } 4798 mGroupFlags |= FLAG_INVALIDATE_REQUIRED; 4799 } 4800 } 4801 } 4802 4803 private LayoutTransition.TransitionListener mLayoutTransitionListener = 4804 new LayoutTransition.TransitionListener() { 4805 @Override 4806 public void startTransition(LayoutTransition transition, ViewGroup container, 4807 View view, int transitionType) { 4808 // We only care about disappearing items, since we need special logic to keep 4809 // those items visible after they've been 'removed' 4810 if (transitionType == LayoutTransition.DISAPPEARING) { 4811 startViewTransition(view); 4812 } 4813 } 4814 4815 @Override 4816 public void endTransition(LayoutTransition transition, ViewGroup container, 4817 View view, int transitionType) { 4818 if (mLayoutSuppressed && !transition.isChangingLayout()) { 4819 requestLayout(); 4820 mLayoutSuppressed = false; 4821 } 4822 if (transitionType == LayoutTransition.DISAPPEARING && mTransitioningViews != null) { 4823 endViewTransition(view); 4824 } 4825 } 4826 }; 4827 4828 /** 4829 * {@inheritDoc} 4830 */ 4831 @Override 4832 public boolean gatherTransparentRegion(Region region) { 4833 // If no transparent regions requested, we are always opaque. 4834 final boolean meOpaque = (mPrivateFlags & View.REQUEST_TRANSPARENT_REGIONS) == 0; 4835 if (meOpaque && region == null) { 4836 // The caller doesn't care about the region, so stop now. 4837 return true; 4838 } 4839 super.gatherTransparentRegion(region); 4840 final View[] children = mChildren; 4841 final int count = mChildrenCount; 4842 boolean noneOfTheChildrenAreTransparent = true; 4843 for (int i = 0; i < count; i++) { 4844 final View child = children[i]; 4845 if ((child.mViewFlags & VISIBILITY_MASK) == VISIBLE || child.getAnimation() != null) { 4846 if (!child.gatherTransparentRegion(region)) { 4847 noneOfTheChildrenAreTransparent = false; 4848 } 4849 } 4850 } 4851 return meOpaque || noneOfTheChildrenAreTransparent; 4852 } 4853 4854 /** 4855 * {@inheritDoc} 4856 */ 4857 public void requestTransparentRegion(View child) { 4858 if (child != null) { 4859 child.mPrivateFlags |= View.REQUEST_TRANSPARENT_REGIONS; 4860 if (mParent != null) { 4861 mParent.requestTransparentRegion(this); 4862 } 4863 } 4864 } 4865 4866 4867 @Override 4868 protected boolean fitSystemWindows(Rect insets) { 4869 boolean done = super.fitSystemWindows(insets); 4870 if (!done) { 4871 final int count = mChildrenCount; 4872 final View[] children = mChildren; 4873 for (int i = 0; i < count; i++) { 4874 done = children[i].fitSystemWindows(insets); 4875 if (done) { 4876 break; 4877 } 4878 } 4879 } 4880 return done; 4881 } 4882 4883 /** 4884 * Returns the animation listener to which layout animation events are 4885 * sent. 4886 * 4887 * @return an {@link android.view.animation.Animation.AnimationListener} 4888 */ 4889 public Animation.AnimationListener getLayoutAnimationListener() { 4890 return mAnimationListener; 4891 } 4892 4893 @Override 4894 protected void drawableStateChanged() { 4895 super.drawableStateChanged(); 4896 4897 if ((mGroupFlags & FLAG_NOTIFY_CHILDREN_ON_DRAWABLE_STATE_CHANGE) != 0) { 4898 if ((mGroupFlags & FLAG_ADD_STATES_FROM_CHILDREN) != 0) { 4899 throw new IllegalStateException("addStateFromChildren cannot be enabled if a" 4900 + " child has duplicateParentState set to true"); 4901 } 4902 4903 final View[] children = mChildren; 4904 final int count = mChildrenCount; 4905 4906 for (int i = 0; i < count; i++) { 4907 final View child = children[i]; 4908 if ((child.mViewFlags & DUPLICATE_PARENT_STATE) != 0) { 4909 child.refreshDrawableState(); 4910 } 4911 } 4912 } 4913 } 4914 4915 @Override 4916 public void jumpDrawablesToCurrentState() { 4917 super.jumpDrawablesToCurrentState(); 4918 final View[] children = mChildren; 4919 final int count = mChildrenCount; 4920 for (int i = 0; i < count; i++) { 4921 children[i].jumpDrawablesToCurrentState(); 4922 } 4923 } 4924 4925 @Override 4926 protected int[] onCreateDrawableState(int extraSpace) { 4927 if ((mGroupFlags & FLAG_ADD_STATES_FROM_CHILDREN) == 0) { 4928 return super.onCreateDrawableState(extraSpace); 4929 } 4930 4931 int need = 0; 4932 int n = getChildCount(); 4933 for (int i = 0; i < n; i++) { 4934 int[] childState = getChildAt(i).getDrawableState(); 4935 4936 if (childState != null) { 4937 need += childState.length; 4938 } 4939 } 4940 4941 int[] state = super.onCreateDrawableState(extraSpace + need); 4942 4943 for (int i = 0; i < n; i++) { 4944 int[] childState = getChildAt(i).getDrawableState(); 4945 4946 if (childState != null) { 4947 state = mergeDrawableStates(state, childState); 4948 } 4949 } 4950 4951 return state; 4952 } 4953 4954 /** 4955 * Sets 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 void setAddStatesFromChildren(boolean addsStates) { 4961 if (addsStates) { 4962 mGroupFlags |= FLAG_ADD_STATES_FROM_CHILDREN; 4963 } else { 4964 mGroupFlags &= ~FLAG_ADD_STATES_FROM_CHILDREN; 4965 } 4966 4967 refreshDrawableState(); 4968 } 4969 4970 /** 4971 * Returns whether this ViewGroup's drawable states also include 4972 * its children's drawable states. This is used, for example, to 4973 * make a group appear to be focused when its child EditText or button 4974 * is focused. 4975 */ 4976 public boolean addStatesFromChildren() { 4977 return (mGroupFlags & FLAG_ADD_STATES_FROM_CHILDREN) != 0; 4978 } 4979 4980 /** 4981 * If {link #addStatesFromChildren} is true, refreshes this group's 4982 * drawable state (to include the states from its children). 4983 */ 4984 public void childDrawableStateChanged(View child) { 4985 if ((mGroupFlags & FLAG_ADD_STATES_FROM_CHILDREN) != 0) { 4986 refreshDrawableState(); 4987 } 4988 } 4989 4990 /** 4991 * Specifies the animation listener to which layout animation events must 4992 * be sent. Only 4993 * {@link android.view.animation.Animation.AnimationListener#onAnimationStart(Animation)} 4994 * and 4995 * {@link android.view.animation.Animation.AnimationListener#onAnimationEnd(Animation)} 4996 * are invoked. 4997 * 4998 * @param animationListener the layout animation listener 4999 */ 5000 public void setLayoutAnimationListener(Animation.AnimationListener animationListener) { 5001 mAnimationListener = animationListener; 5002 } 5003 5004 /** 5005 * This method is called by LayoutTransition when there are 'changing' animations that need 5006 * to start after the layout/setup phase. The request is forwarded to the ViewAncestor, who 5007 * starts all pending transitions prior to the drawing phase in the current traversal. 5008 * 5009 * @param transition The LayoutTransition to be started on the next traversal. 5010 * 5011 * @hide 5012 */ 5013 public void requestTransitionStart(LayoutTransition transition) { 5014 ViewRootImpl viewAncestor = getViewRootImpl(); 5015 viewAncestor.requestTransitionStart(transition); 5016 } 5017 5018 @Override 5019 protected void resetResolvedLayoutDirection() { 5020 super.resetResolvedLayoutDirection(); 5021 5022 // Take care of resetting the children resolution too 5023 final int count = getChildCount(); 5024 for (int i = 0; i < count; i++) { 5025 final View child = getChildAt(i); 5026 if (child.getLayoutDirection() == LAYOUT_DIRECTION_INHERIT) { 5027 child.resetResolvedLayoutDirection(); 5028 } 5029 } 5030 } 5031 5032 @Override 5033 protected void resetResolvedTextDirection() { 5034 super.resetResolvedTextDirection(); 5035 5036 // Take care of resetting the children resolution too 5037 final int count = getChildCount(); 5038 for (int i = 0; i < count; i++) { 5039 final View child = getChildAt(i); 5040 if (child.getTextDirection() == TEXT_DIRECTION_INHERIT) { 5041 child.resetResolvedTextDirection(); 5042 } 5043 } 5044 } 5045 5046 /** 5047 * Return true if the pressed state should be delayed for children or descendants of this 5048 * ViewGroup. Generally, this should be done for containers that can scroll, such as a List. 5049 * This prevents the pressed state from appearing when the user is actually trying to scroll 5050 * the content. 5051 * 5052 * The default implementation returns true for compatibility reasons. Subclasses that do 5053 * not scroll should generally override this method and return false. 5054 */ 5055 public boolean shouldDelayChildPressedState() { 5056 return true; 5057 } 5058 5059 /** 5060 * LayoutParams are used by views to tell their parents how they want to be 5061 * laid out. See 5062 * {@link android.R.styleable#ViewGroup_Layout ViewGroup Layout Attributes} 5063 * for a list of all child view attributes that this class supports. 5064 * 5065 * <p> 5066 * The base LayoutParams class just describes how big the view wants to be 5067 * for both width and height. For each dimension, it can specify one of: 5068 * <ul> 5069 * <li>FILL_PARENT (renamed MATCH_PARENT in API Level 8 and higher), which 5070 * means that the view wants to be as big as its parent (minus padding) 5071 * <li> WRAP_CONTENT, which means that the view wants to be just big enough 5072 * to enclose its content (plus padding) 5073 * <li> an exact number 5074 * </ul> 5075 * There are subclasses of LayoutParams for different subclasses of 5076 * ViewGroup. For example, AbsoluteLayout has its own subclass of 5077 * LayoutParams which adds an X and Y value. 5078 * 5079 * @attr ref android.R.styleable#ViewGroup_Layout_layout_height 5080 * @attr ref android.R.styleable#ViewGroup_Layout_layout_width 5081 */ 5082 public static class LayoutParams { 5083 /** 5084 * Special value for the height or width requested by a View. 5085 * FILL_PARENT means that the view wants to be as big as its parent, 5086 * minus the parent's padding, if any. This value is deprecated 5087 * starting in API Level 8 and replaced by {@link #MATCH_PARENT}. 5088 */ 5089 @SuppressWarnings({"UnusedDeclaration"}) 5090 @Deprecated 5091 public static final int FILL_PARENT = -1; 5092 5093 /** 5094 * Special value for the height or width requested by a View. 5095 * MATCH_PARENT means that the view wants to be as big as its parent, 5096 * minus the parent's padding, if any. Introduced in API Level 8. 5097 */ 5098 public static final int MATCH_PARENT = -1; 5099 5100 /** 5101 * Special value for the height or width requested by a View. 5102 * WRAP_CONTENT means that the view wants to be just large enough to fit 5103 * its own internal content, taking its own padding into account. 5104 */ 5105 public static final int WRAP_CONTENT = -2; 5106 5107 /** 5108 * Information about how wide the view wants to be. Can be one of the 5109 * constants FILL_PARENT (replaced by MATCH_PARENT , 5110 * in API Level 8) or WRAP_CONTENT. or an exact size. 5111 */ 5112 @ViewDebug.ExportedProperty(category = "layout", mapping = { 5113 @ViewDebug.IntToString(from = MATCH_PARENT, to = "MATCH_PARENT"), 5114 @ViewDebug.IntToString(from = WRAP_CONTENT, to = "WRAP_CONTENT") 5115 }) 5116 public int width; 5117 5118 /** 5119 * Information about how tall the view wants to be. Can be one of the 5120 * constants FILL_PARENT (replaced by MATCH_PARENT , 5121 * in API Level 8) or WRAP_CONTENT. or an exact size. 5122 */ 5123 @ViewDebug.ExportedProperty(category = "layout", mapping = { 5124 @ViewDebug.IntToString(from = MATCH_PARENT, to = "MATCH_PARENT"), 5125 @ViewDebug.IntToString(from = WRAP_CONTENT, to = "WRAP_CONTENT") 5126 }) 5127 public int height; 5128 5129 /** 5130 * Used to animate layouts. 5131 */ 5132 public LayoutAnimationController.AnimationParameters layoutAnimationParameters; 5133 5134 /** 5135 * Creates a new set of layout parameters. The values are extracted from 5136 * the supplied attributes set and context. The XML attributes mapped 5137 * to this set of layout parameters are: 5138 * 5139 * <ul> 5140 * <li><code>layout_width</code>: the width, either an exact value, 5141 * {@link #WRAP_CONTENT}, or {@link #FILL_PARENT} (replaced by 5142 * {@link #MATCH_PARENT} in API Level 8)</li> 5143 * <li><code>layout_height</code>: the height, either an exact value, 5144 * {@link #WRAP_CONTENT}, or {@link #FILL_PARENT} (replaced by 5145 * {@link #MATCH_PARENT} in API Level 8)</li> 5146 * </ul> 5147 * 5148 * @param c the application environment 5149 * @param attrs the set of attributes from which to extract the layout 5150 * parameters' values 5151 */ 5152 public LayoutParams(Context c, AttributeSet attrs) { 5153 TypedArray a = c.obtainStyledAttributes(attrs, R.styleable.ViewGroup_Layout); 5154 setBaseAttributes(a, 5155 R.styleable.ViewGroup_Layout_layout_width, 5156 R.styleable.ViewGroup_Layout_layout_height); 5157 a.recycle(); 5158 } 5159 5160 /** 5161 * Creates a new set of layout parameters with the specified width 5162 * and height. 5163 * 5164 * @param width the width, either {@link #WRAP_CONTENT}, 5165 * {@link #FILL_PARENT} (replaced by {@link #MATCH_PARENT} in 5166 * API Level 8), or a fixed size in pixels 5167 * @param height the height, either {@link #WRAP_CONTENT}, 5168 * {@link #FILL_PARENT} (replaced by {@link #MATCH_PARENT} in 5169 * API Level 8), or a fixed size in pixels 5170 */ 5171 public LayoutParams(int width, int height) { 5172 this.width = width; 5173 this.height = height; 5174 } 5175 5176 /** 5177 * Copy constructor. Clones the width and height values of the source. 5178 * 5179 * @param source The layout params to copy from. 5180 */ 5181 public LayoutParams(LayoutParams source) { 5182 this.width = source.width; 5183 this.height = source.height; 5184 } 5185 5186 /** 5187 * Used internally by MarginLayoutParams. 5188 * @hide 5189 */ 5190 LayoutParams() { 5191 } 5192 5193 /** 5194 * Extracts the layout parameters from the supplied attributes. 5195 * 5196 * @param a the style attributes to extract the parameters from 5197 * @param widthAttr the identifier of the width attribute 5198 * @param heightAttr the identifier of the height attribute 5199 */ 5200 protected void setBaseAttributes(TypedArray a, int widthAttr, int heightAttr) { 5201 width = a.getLayoutDimension(widthAttr, "layout_width"); 5202 height = a.getLayoutDimension(heightAttr, "layout_height"); 5203 } 5204 5205 /** 5206 * Resolve layout parameters depending on the layout direction. Subclasses that care about 5207 * layoutDirection changes should override this method. The default implementation does 5208 * nothing. 5209 * 5210 * @param layoutDirection the direction of the layout 5211 * 5212 * {@link View#LAYOUT_DIRECTION_LTR} 5213 * {@link View#LAYOUT_DIRECTION_RTL} 5214 * 5215 * @hide 5216 */ 5217 protected void resolveWithDirection(int layoutDirection) { 5218 } 5219 5220 /** 5221 * Returns a String representation of this set of layout parameters. 5222 * 5223 * @param output the String to prepend to the internal representation 5224 * @return a String with the following format: output + 5225 * "ViewGroup.LayoutParams={ width=WIDTH, height=HEIGHT }" 5226 * 5227 * @hide 5228 */ 5229 public String debug(String output) { 5230 return output + "ViewGroup.LayoutParams={ width=" 5231 + sizeToString(width) + ", height=" + sizeToString(height) + " }"; 5232 } 5233 5234 /** 5235 * Converts the specified size to a readable String. 5236 * 5237 * @param size the size to convert 5238 * @return a String instance representing the supplied size 5239 * 5240 * @hide 5241 */ 5242 protected static String sizeToString(int size) { 5243 if (size == WRAP_CONTENT) { 5244 return "wrap-content"; 5245 } 5246 if (size == MATCH_PARENT) { 5247 return "match-parent"; 5248 } 5249 return String.valueOf(size); 5250 } 5251 } 5252 5253 /** 5254 * Per-child layout information for layouts that support margins. 5255 * See 5256 * {@link android.R.styleable#ViewGroup_MarginLayout ViewGroup Margin Layout Attributes} 5257 * for a list of all child view attributes that this class supports. 5258 */ 5259 public static class MarginLayoutParams extends ViewGroup.LayoutParams { 5260 /** 5261 * The left margin in pixels of the child. Whenever this value is changed, a call to 5262 * {@link android.view.View#requestLayout()} needs to be done. 5263 */ 5264 @ViewDebug.ExportedProperty(category = "layout") 5265 public int leftMargin; 5266 5267 /** 5268 * The top margin in pixels of the child. Whenever this value is changed, a call to 5269 * {@link android.view.View#requestLayout()} needs to be done. 5270 */ 5271 @ViewDebug.ExportedProperty(category = "layout") 5272 public int topMargin; 5273 5274 /** 5275 * The right margin in pixels of the child. Whenever this value is changed, a call to 5276 * {@link android.view.View#requestLayout()} needs to be done. 5277 */ 5278 @ViewDebug.ExportedProperty(category = "layout") 5279 public int rightMargin; 5280 5281 /** 5282 * The bottom margin in pixels of the child. Whenever this value is changed, a call to 5283 * {@link android.view.View#requestLayout()} needs to be done. 5284 */ 5285 @ViewDebug.ExportedProperty(category = "layout") 5286 public int bottomMargin; 5287 5288 /** 5289 * The start margin in pixels of the child. 5290 * 5291 * @hide 5292 * 5293 */ 5294 @ViewDebug.ExportedProperty(category = "layout") 5295 protected int startMargin = DEFAULT_RELATIVE; 5296 5297 /** 5298 * The end margin in pixels of the child. 5299 * 5300 * @hide 5301 */ 5302 @ViewDebug.ExportedProperty(category = "layout") 5303 protected int endMargin = DEFAULT_RELATIVE; 5304 5305 /** 5306 * The default start and end margin. 5307 */ 5308 static private final int DEFAULT_RELATIVE = Integer.MIN_VALUE; 5309 5310 /** 5311 * Creates a new set of layout parameters. The values are extracted from 5312 * the supplied attributes set and context. 5313 * 5314 * @param c the application environment 5315 * @param attrs the set of attributes from which to extract the layout 5316 * parameters' values 5317 */ 5318 public MarginLayoutParams(Context c, AttributeSet attrs) { 5319 super(); 5320 5321 TypedArray a = c.obtainStyledAttributes(attrs, R.styleable.ViewGroup_MarginLayout); 5322 setBaseAttributes(a, 5323 R.styleable.ViewGroup_MarginLayout_layout_width, 5324 R.styleable.ViewGroup_MarginLayout_layout_height); 5325 5326 int margin = a.getDimensionPixelSize( 5327 com.android.internal.R.styleable.ViewGroup_MarginLayout_layout_margin, -1); 5328 if (margin >= 0) { 5329 leftMargin = margin; 5330 topMargin = margin; 5331 rightMargin= margin; 5332 bottomMargin = margin; 5333 } else { 5334 leftMargin = a.getDimensionPixelSize( 5335 R.styleable.ViewGroup_MarginLayout_layout_marginLeft, 0); 5336 topMargin = a.getDimensionPixelSize( 5337 R.styleable.ViewGroup_MarginLayout_layout_marginTop, 0); 5338 rightMargin = a.getDimensionPixelSize( 5339 R.styleable.ViewGroup_MarginLayout_layout_marginRight, 0); 5340 bottomMargin = a.getDimensionPixelSize( 5341 R.styleable.ViewGroup_MarginLayout_layout_marginBottom, 0); 5342 startMargin = a.getDimensionPixelSize( 5343 R.styleable.ViewGroup_MarginLayout_layout_marginStart, DEFAULT_RELATIVE); 5344 endMargin = a.getDimensionPixelSize( 5345 R.styleable.ViewGroup_MarginLayout_layout_marginEnd, DEFAULT_RELATIVE); 5346 } 5347 5348 a.recycle(); 5349 } 5350 5351 /** 5352 * {@inheritDoc} 5353 */ 5354 public MarginLayoutParams(int width, int height) { 5355 super(width, height); 5356 } 5357 5358 /** 5359 * Copy constructor. Clones the width, height and margin values of the source. 5360 * 5361 * @param source The layout params to copy from. 5362 */ 5363 public MarginLayoutParams(MarginLayoutParams source) { 5364 this.width = source.width; 5365 this.height = source.height; 5366 5367 this.leftMargin = source.leftMargin; 5368 this.topMargin = source.topMargin; 5369 this.rightMargin = source.rightMargin; 5370 this.bottomMargin = source.bottomMargin; 5371 this.startMargin = source.startMargin; 5372 this.endMargin = source.endMargin; 5373 } 5374 5375 /** 5376 * {@inheritDoc} 5377 */ 5378 public MarginLayoutParams(LayoutParams source) { 5379 super(source); 5380 } 5381 5382 /** 5383 * Sets the margins, in pixels. A call to {@link android.view.View#requestLayout()} needs 5384 * to be done so that the new margins are taken into account. Left and right margins may be 5385 * overriden by {@link android.view.View#requestLayout()} depending on layout direction. 5386 * 5387 * @param left the left margin size 5388 * @param top the top margin size 5389 * @param right the right margin size 5390 * @param bottom the bottom margin size 5391 * 5392 * @attr ref android.R.styleable#ViewGroup_MarginLayout_layout_marginLeft 5393 * @attr ref android.R.styleable#ViewGroup_MarginLayout_layout_marginTop 5394 * @attr ref android.R.styleable#ViewGroup_MarginLayout_layout_marginRight 5395 * @attr ref android.R.styleable#ViewGroup_MarginLayout_layout_marginBottom 5396 */ 5397 public void setMargins(int left, int top, int right, int bottom) { 5398 leftMargin = left; 5399 topMargin = top; 5400 rightMargin = right; 5401 bottomMargin = bottom; 5402 } 5403 5404 /** 5405 * Sets the relative margins, in pixels. A call to {@link android.view.View#requestLayout()} 5406 * needs to be done so that the new relative margins are taken into account. Left and right 5407 * margins may be overriden by {@link android.view.View#requestLayout()} depending on layout 5408 * direction. 5409 * 5410 * @param start the start margin size 5411 * @param top the top margin size 5412 * @param end the right margin size 5413 * @param bottom the bottom margin size 5414 * 5415 * @attr ref android.R.styleable#ViewGroup_MarginLayout_layout_marginStart 5416 * @attr ref android.R.styleable#ViewGroup_MarginLayout_layout_marginTop 5417 * @attr ref android.R.styleable#ViewGroup_MarginLayout_layout_marginEnd 5418 * @attr ref android.R.styleable#ViewGroup_MarginLayout_layout_marginBottom 5419 * 5420 * @hide 5421 */ 5422 public void setMarginsRelative(int start, int top, int end, int bottom) { 5423 startMargin = start; 5424 topMargin = top; 5425 endMargin = end; 5426 bottomMargin = bottom; 5427 } 5428 5429 /** 5430 * Returns the start margin in pixels. 5431 * 5432 * @attr ref android.R.styleable#ViewGroup_MarginLayout_layout_marginStart 5433 * 5434 * @return the start margin in pixels. 5435 * 5436 * @hide 5437 */ 5438 public int getMarginStart() { 5439 return startMargin; 5440 } 5441 5442 /** 5443 * Returns the end margin in pixels. 5444 * 5445 * @attr ref android.R.styleable#ViewGroup_MarginLayout_layout_marginEnd 5446 * 5447 * @return the end margin in pixels. 5448 * 5449 * @hide 5450 */ 5451 public int getMarginEnd() { 5452 return endMargin; 5453 } 5454 5455 /** 5456 * Check if margins are relative. 5457 * 5458 * @attr ref android.R.styleable#ViewGroup_MarginLayout_layout_marginStart 5459 * @attr ref android.R.styleable#ViewGroup_MarginLayout_layout_marginEnd 5460 * 5461 * @return true if either marginStart or marginEnd has been set 5462 * 5463 * @hide 5464 */ 5465 public boolean isMarginRelative() { 5466 return (startMargin != DEFAULT_RELATIVE) || (endMargin != DEFAULT_RELATIVE); 5467 } 5468 5469 /** 5470 * This will be called by {@link android.view.View#requestLayout()}. Left and Right margins 5471 * maybe overriden depending on layout direction. 5472 * 5473 * @hide 5474 */ 5475 @Override 5476 protected void resolveWithDirection(int layoutDirection) { 5477 switch(layoutDirection) { 5478 case View.LAYOUT_DIRECTION_RTL: 5479 leftMargin = (endMargin > DEFAULT_RELATIVE) ? endMargin : leftMargin; 5480 rightMargin = (startMargin > DEFAULT_RELATIVE) ? startMargin : rightMargin; 5481 break; 5482 case View.LAYOUT_DIRECTION_LTR: 5483 default: 5484 leftMargin = (startMargin > DEFAULT_RELATIVE) ? startMargin : leftMargin; 5485 rightMargin = (endMargin > DEFAULT_RELATIVE) ? endMargin : rightMargin; 5486 break; 5487 } 5488 } 5489 } 5490 5491 /* Describes a touched view and the ids of the pointers that it has captured. 5492 * 5493 * This code assumes that pointer ids are always in the range 0..31 such that 5494 * it can use a bitfield to track which pointer ids are present. 5495 * As it happens, the lower layers of the input dispatch pipeline also use the 5496 * same trick so the assumption should be safe here... 5497 */ 5498 private static final class TouchTarget { 5499 private static final int MAX_RECYCLED = 32; 5500 private static final Object sRecycleLock = new Object(); 5501 private static TouchTarget sRecycleBin; 5502 private static int sRecycledCount; 5503 5504 public static final int ALL_POINTER_IDS = -1; // all ones 5505 5506 // The touched child view. 5507 public View child; 5508 5509 // The combined bit mask of pointer ids for all pointers captured by the target. 5510 public int pointerIdBits; 5511 5512 // The next target in the target list. 5513 public TouchTarget next; 5514 5515 private TouchTarget() { 5516 } 5517 5518 public static TouchTarget obtain(View child, int pointerIdBits) { 5519 final TouchTarget target; 5520 synchronized (sRecycleLock) { 5521 if (sRecycleBin == null) { 5522 target = new TouchTarget(); 5523 } else { 5524 target = sRecycleBin; 5525 sRecycleBin = target.next; 5526 sRecycledCount--; 5527 target.next = null; 5528 } 5529 } 5530 target.child = child; 5531 target.pointerIdBits = pointerIdBits; 5532 return target; 5533 } 5534 5535 public void recycle() { 5536 synchronized (sRecycleLock) { 5537 if (sRecycledCount < MAX_RECYCLED) { 5538 next = sRecycleBin; 5539 sRecycleBin = this; 5540 sRecycledCount += 1; 5541 } else { 5542 next = null; 5543 } 5544 child = null; 5545 } 5546 } 5547 } 5548 5549 /* Describes a hovered view. */ 5550 private static final class HoverTarget { 5551 private static final int MAX_RECYCLED = 32; 5552 private static final Object sRecycleLock = new Object(); 5553 private static HoverTarget sRecycleBin; 5554 private static int sRecycledCount; 5555 5556 // The hovered child view. 5557 public View child; 5558 5559 // The next target in the target list. 5560 public HoverTarget next; 5561 5562 private HoverTarget() { 5563 } 5564 5565 public static HoverTarget obtain(View child) { 5566 final HoverTarget target; 5567 synchronized (sRecycleLock) { 5568 if (sRecycleBin == null) { 5569 target = new HoverTarget(); 5570 } else { 5571 target = sRecycleBin; 5572 sRecycleBin = target.next; 5573 sRecycledCount--; 5574 target.next = null; 5575 } 5576 } 5577 target.child = child; 5578 return target; 5579 } 5580 5581 public void recycle() { 5582 synchronized (sRecycleLock) { 5583 if (sRecycledCount < MAX_RECYCLED) { 5584 next = sRecycleBin; 5585 sRecycleBin = this; 5586 sRecycledCount += 1; 5587 } else { 5588 next = null; 5589 } 5590 child = null; 5591 } 5592 } 5593 } 5594} 5595