ViewGroup.java revision 73eb97f628b298c7bd032aa9db11dadf05f5b539
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 * <div class="special reference"> 64 * <h3>Developer Guides</h3> 65 * <p>For more information about creating user interface layouts, read the 66 * <a href="{@docRoot}guide/topics/ui/declaring-layout.html">XML Layouts</a> developer 67 * guide.</p></div> 68 * 69 * @attr ref android.R.styleable#ViewGroup_clipChildren 70 * @attr ref android.R.styleable#ViewGroup_clipToPadding 71 * @attr ref android.R.styleable#ViewGroup_layoutAnimation 72 * @attr ref android.R.styleable#ViewGroup_animationCache 73 * @attr ref android.R.styleable#ViewGroup_persistentDrawingCache 74 * @attr ref android.R.styleable#ViewGroup_alwaysDrawnWithCache 75 * @attr ref android.R.styleable#ViewGroup_addStatesFromChildren 76 * @attr ref android.R.styleable#ViewGroup_descendantFocusability 77 * @attr ref android.R.styleable#ViewGroup_animateLayoutChanges 78 */ 79public abstract class ViewGroup extends View implements ViewParent, ViewManager { 80 81 private static final boolean DBG = false; 82 83 /** 84 * Views which have been hidden or removed which need to be animated on 85 * their way out. 86 * This field should be made private, so it is hidden from the SDK. 87 * {@hide} 88 */ 89 protected ArrayList<View> mDisappearingChildren; 90 91 /** 92 * Listener used to propagate events indicating when children are added 93 * and/or removed from a view group. 94 * This field should be made private, so it is hidden from the SDK. 95 * {@hide} 96 */ 97 protected OnHierarchyChangeListener mOnHierarchyChangeListener; 98 99 // The view contained within this ViewGroup that has or contains focus. 100 private View mFocused; 101 102 /** 103 * A Transformation used when drawing children, to 104 * apply on the child being drawn. 105 */ 106 private final Transformation mChildTransformation = new Transformation(); 107 108 /** 109 * Used to track the current invalidation region. 110 */ 111 private RectF mInvalidateRegion; 112 113 /** 114 * A Transformation used to calculate a correct 115 * invalidation area when the application is autoscaled. 116 */ 117 private Transformation mInvalidationTransformation; 118 119 // View currently under an ongoing drag 120 private View mCurrentDragView; 121 122 // Metadata about the ongoing drag 123 private DragEvent mCurrentDrag; 124 private HashSet<View> mDragNotifiedChildren; 125 126 // Does this group have a child that can accept the current drag payload? 127 private boolean mChildAcceptsDrag; 128 129 // Used during drag dispatch 130 private final PointF mLocalPoint = new PointF(); 131 132 // Layout animation 133 private LayoutAnimationController mLayoutAnimationController; 134 private Animation.AnimationListener mAnimationListener; 135 136 // First touch target in the linked list of touch targets. 137 private TouchTarget mFirstTouchTarget; 138 139 // For debugging only. You can see these in hierarchyviewer. 140 @SuppressWarnings({"FieldCanBeLocal", "UnusedDeclaration"}) 141 @ViewDebug.ExportedProperty(category = "events") 142 private long mLastTouchDownTime; 143 @ViewDebug.ExportedProperty(category = "events") 144 private int mLastTouchDownIndex = -1; 145 @SuppressWarnings({"FieldCanBeLocal", "UnusedDeclaration"}) 146 @ViewDebug.ExportedProperty(category = "events") 147 private float mLastTouchDownX; 148 @SuppressWarnings({"FieldCanBeLocal", "UnusedDeclaration"}) 149 @ViewDebug.ExportedProperty(category = "events") 150 private float mLastTouchDownY; 151 152 // First hover target in the linked list of hover targets. 153 // The hover targets are children which have received ACTION_HOVER_ENTER. 154 // They might not have actually handled the hover event, but we will 155 // continue sending hover events to them as long as the pointer remains over 156 // their bounds and the view group does not intercept hover. 157 private HoverTarget mFirstHoverTarget; 158 159 // True if the view group itself received a hover event. 160 // It might not have actually handled the hover event. 161 private boolean mHoveredSelf; 162 163 /** 164 * Internal flags. 165 * 166 * This field should be made private, so it is hidden from the SDK. 167 * {@hide} 168 */ 169 protected int mGroupFlags; 170 171 // When set, ViewGroup invalidates only the child's rectangle 172 // Set by default 173 private static final int FLAG_CLIP_CHILDREN = 0x1; 174 175 // When set, ViewGroup excludes the padding area from the invalidate rectangle 176 // Set by default 177 private static final int FLAG_CLIP_TO_PADDING = 0x2; 178 179 // When set, dispatchDraw() will invoke invalidate(); this is set by drawChild() when 180 // a child needs to be invalidated and FLAG_OPTIMIZE_INVALIDATE is set 181 private static final int FLAG_INVALIDATE_REQUIRED = 0x4; 182 183 // When set, dispatchDraw() will run the layout animation and unset the flag 184 private static final int FLAG_RUN_ANIMATION = 0x8; 185 186 // When set, there is either no layout animation on the ViewGroup or the layout 187 // animation is over 188 // Set by default 189 private static final int FLAG_ANIMATION_DONE = 0x10; 190 191 // If set, this ViewGroup has padding; if unset there is no padding and we don't need 192 // to clip it, even if FLAG_CLIP_TO_PADDING is set 193 private static final int FLAG_PADDING_NOT_NULL = 0x20; 194 195 // When set, this ViewGroup caches its children in a Bitmap before starting a layout animation 196 // Set by default 197 private static final int FLAG_ANIMATION_CACHE = 0x40; 198 199 // When set, this ViewGroup converts calls to invalidate(Rect) to invalidate() during a 200 // layout animation; this avoid clobbering the hierarchy 201 // Automatically set when the layout animation starts, depending on the animation's 202 // characteristics 203 private static final int FLAG_OPTIMIZE_INVALIDATE = 0x80; 204 205 // When set, the next call to drawChild() will clear mChildTransformation's matrix 206 private static final int FLAG_CLEAR_TRANSFORMATION = 0x100; 207 208 // When set, this ViewGroup invokes mAnimationListener.onAnimationEnd() and removes 209 // the children's Bitmap caches if necessary 210 // This flag is set when the layout animation is over (after FLAG_ANIMATION_DONE is set) 211 private static final int FLAG_NOTIFY_ANIMATION_LISTENER = 0x200; 212 213 /** 214 * When set, the drawing method will call {@link #getChildDrawingOrder(int, int)} 215 * to get the index of the child to draw for that iteration. 216 * 217 * @hide 218 */ 219 protected static final int FLAG_USE_CHILD_DRAWING_ORDER = 0x400; 220 221 /** 222 * When set, this ViewGroup supports static transformations on children; this causes 223 * {@link #getChildStaticTransformation(View, android.view.animation.Transformation)} to be 224 * invoked when a child is drawn. 225 * 226 * Any subclass overriding 227 * {@link #getChildStaticTransformation(View, android.view.animation.Transformation)} should 228 * set this flags in {@link #mGroupFlags}. 229 * 230 * {@hide} 231 */ 232 protected static final int FLAG_SUPPORT_STATIC_TRANSFORMATIONS = 0x800; 233 234 // When the previous drawChild() invocation used an alpha value that was lower than 235 // 1.0 and set it in mCachePaint 236 private static final int FLAG_ALPHA_LOWER_THAN_ONE = 0x1000; 237 238 /** 239 * When set, this ViewGroup's drawable states also include those 240 * of its children. 241 */ 242 private static final int FLAG_ADD_STATES_FROM_CHILDREN = 0x2000; 243 244 /** 245 * When set, this ViewGroup tries to always draw its children using their drawing cache. 246 */ 247 private static final int FLAG_ALWAYS_DRAWN_WITH_CACHE = 0x4000; 248 249 /** 250 * When set, and if FLAG_ALWAYS_DRAWN_WITH_CACHE is not set, this ViewGroup will try to 251 * draw its children with their drawing cache. 252 */ 253 private static final int FLAG_CHILDREN_DRAWN_WITH_CACHE = 0x8000; 254 255 /** 256 * When set, this group will go through its list of children to notify them of 257 * any drawable state change. 258 */ 259 private static final int FLAG_NOTIFY_CHILDREN_ON_DRAWABLE_STATE_CHANGE = 0x10000; 260 261 private static final int FLAG_MASK_FOCUSABILITY = 0x60000; 262 263 /** 264 * This view will get focus before any of its descendants. 265 */ 266 public static final int FOCUS_BEFORE_DESCENDANTS = 0x20000; 267 268 /** 269 * This view will get focus only if none of its descendants want it. 270 */ 271 public static final int FOCUS_AFTER_DESCENDANTS = 0x40000; 272 273 /** 274 * This view will block any of its descendants from getting focus, even 275 * if they are focusable. 276 */ 277 public static final int FOCUS_BLOCK_DESCENDANTS = 0x60000; 278 279 /** 280 * Used to map between enum in attrubutes and flag values. 281 */ 282 private static final int[] DESCENDANT_FOCUSABILITY_FLAGS = 283 {FOCUS_BEFORE_DESCENDANTS, FOCUS_AFTER_DESCENDANTS, 284 FOCUS_BLOCK_DESCENDANTS}; 285 286 /** 287 * When set, this ViewGroup should not intercept touch events. 288 * {@hide} 289 */ 290 protected static final int FLAG_DISALLOW_INTERCEPT = 0x80000; 291 292 /** 293 * When set, this ViewGroup will split MotionEvents to multiple child Views when appropriate. 294 */ 295 private static final int FLAG_SPLIT_MOTION_EVENTS = 0x200000; 296 297 /** 298 * When set, this ViewGroup will not dispatch onAttachedToWindow calls 299 * to children when adding new views. This is used to prevent multiple 300 * onAttached calls when a ViewGroup adds children in its own onAttached method. 301 */ 302 private static final int FLAG_PREVENT_DISPATCH_ATTACHED_TO_WINDOW = 0x400000; 303 304 /** 305 * Indicates which types of drawing caches are to be kept in memory. 306 * This field should be made private, so it is hidden from the SDK. 307 * {@hide} 308 */ 309 protected int mPersistentDrawingCache; 310 311 /** 312 * Used to indicate that no drawing cache should be kept in memory. 313 */ 314 public static final int PERSISTENT_NO_CACHE = 0x0; 315 316 /** 317 * Used to indicate that the animation drawing cache should be kept in memory. 318 */ 319 public static final int PERSISTENT_ANIMATION_CACHE = 0x1; 320 321 /** 322 * Used to indicate that the scrolling drawing cache should be kept in memory. 323 */ 324 public static final int PERSISTENT_SCROLLING_CACHE = 0x2; 325 326 /** 327 * Used to indicate that all drawing caches should be kept in memory. 328 */ 329 public static final int PERSISTENT_ALL_CACHES = 0x3; 330 331 /** 332 * We clip to padding when FLAG_CLIP_TO_PADDING and FLAG_PADDING_NOT_NULL 333 * are set at the same time. 334 */ 335 protected static final int CLIP_TO_PADDING_MASK = FLAG_CLIP_TO_PADDING | FLAG_PADDING_NOT_NULL; 336 337 // Index of the child's left position in the mLocation array 338 private static final int CHILD_LEFT_INDEX = 0; 339 // Index of the child's top position in the mLocation array 340 private static final int CHILD_TOP_INDEX = 1; 341 342 // Child views of this ViewGroup 343 private View[] mChildren; 344 // Number of valid children in the mChildren array, the rest should be null or not 345 // considered as children 346 347 private boolean mLayoutSuppressed = false; 348 349 private int mChildrenCount; 350 351 private static final int ARRAY_INITIAL_CAPACITY = 12; 352 private static final int ARRAY_CAPACITY_INCREMENT = 12; 353 354 // Used to draw cached views 355 private Paint mCachePaint; 356 357 // Used to animate add/remove changes in layout 358 private LayoutTransition mTransition; 359 360 // The set of views that are currently being transitioned. This list is used to track views 361 // being removed that should not actually be removed from the parent yet because they are 362 // being animated. 363 private ArrayList<View> mTransitioningViews; 364 365 // List of children changing visibility. This is used to potentially keep rendering 366 // views during a transition when they otherwise would have become gone/invisible 367 private ArrayList<View> mVisibilityChangingChildren; 368 369 // Indicates whether this container will use its children layers to draw 370 @ViewDebug.ExportedProperty(category = "drawing") 371 private boolean mDrawLayers = true; 372 373 public ViewGroup(Context context) { 374 super(context); 375 initViewGroup(); 376 } 377 378 public ViewGroup(Context context, AttributeSet attrs) { 379 super(context, attrs); 380 initViewGroup(); 381 initFromAttributes(context, attrs); 382 } 383 384 public ViewGroup(Context context, AttributeSet attrs, int defStyle) { 385 super(context, attrs, defStyle); 386 initViewGroup(); 387 initFromAttributes(context, attrs); 388 } 389 390 private void initViewGroup() { 391 // ViewGroup doesn't draw by default 392 setFlags(WILL_NOT_DRAW, DRAW_MASK); 393 mGroupFlags |= FLAG_CLIP_CHILDREN; 394 mGroupFlags |= FLAG_CLIP_TO_PADDING; 395 mGroupFlags |= FLAG_ANIMATION_DONE; 396 mGroupFlags |= FLAG_ANIMATION_CACHE; 397 mGroupFlags |= FLAG_ALWAYS_DRAWN_WITH_CACHE; 398 399 if (mContext.getApplicationInfo().targetSdkVersion >= Build.VERSION_CODES.HONEYCOMB) { 400 mGroupFlags |= FLAG_SPLIT_MOTION_EVENTS; 401 } 402 403 setDescendantFocusability(FOCUS_BEFORE_DESCENDANTS); 404 405 mChildren = new View[ARRAY_INITIAL_CAPACITY]; 406 mChildrenCount = 0; 407 408 mPersistentDrawingCache = PERSISTENT_SCROLLING_CACHE; 409 } 410 411 private void initFromAttributes(Context context, AttributeSet attrs) { 412 TypedArray a = context.obtainStyledAttributes(attrs, 413 R.styleable.ViewGroup); 414 415 final int N = a.getIndexCount(); 416 for (int i = 0; i < N; i++) { 417 int attr = a.getIndex(i); 418 switch (attr) { 419 case R.styleable.ViewGroup_clipChildren: 420 setClipChildren(a.getBoolean(attr, true)); 421 break; 422 case R.styleable.ViewGroup_clipToPadding: 423 setClipToPadding(a.getBoolean(attr, true)); 424 break; 425 case R.styleable.ViewGroup_animationCache: 426 setAnimationCacheEnabled(a.getBoolean(attr, true)); 427 break; 428 case R.styleable.ViewGroup_persistentDrawingCache: 429 setPersistentDrawingCache(a.getInt(attr, PERSISTENT_SCROLLING_CACHE)); 430 break; 431 case R.styleable.ViewGroup_addStatesFromChildren: 432 setAddStatesFromChildren(a.getBoolean(attr, false)); 433 break; 434 case R.styleable.ViewGroup_alwaysDrawnWithCache: 435 setAlwaysDrawnWithCacheEnabled(a.getBoolean(attr, true)); 436 break; 437 case R.styleable.ViewGroup_layoutAnimation: 438 int id = a.getResourceId(attr, -1); 439 if (id > 0) { 440 setLayoutAnimation(AnimationUtils.loadLayoutAnimation(mContext, id)); 441 } 442 break; 443 case R.styleable.ViewGroup_descendantFocusability: 444 setDescendantFocusability(DESCENDANT_FOCUSABILITY_FLAGS[a.getInt(attr, 0)]); 445 break; 446 case R.styleable.ViewGroup_splitMotionEvents: 447 setMotionEventSplittingEnabled(a.getBoolean(attr, false)); 448 break; 449 case R.styleable.ViewGroup_animateLayoutChanges: 450 boolean animateLayoutChanges = a.getBoolean(attr, false); 451 if (animateLayoutChanges) { 452 setLayoutTransition(new LayoutTransition()); 453 } 454 break; 455 } 456 } 457 458 a.recycle(); 459 } 460 461 /** 462 * Gets the descendant focusability of this view group. The descendant 463 * focusability defines the relationship between this view group and its 464 * descendants when looking for a view to take focus in 465 * {@link #requestFocus(int, android.graphics.Rect)}. 466 * 467 * @return one of {@link #FOCUS_BEFORE_DESCENDANTS}, {@link #FOCUS_AFTER_DESCENDANTS}, 468 * {@link #FOCUS_BLOCK_DESCENDANTS}. 469 */ 470 @ViewDebug.ExportedProperty(category = "focus", mapping = { 471 @ViewDebug.IntToString(from = FOCUS_BEFORE_DESCENDANTS, to = "FOCUS_BEFORE_DESCENDANTS"), 472 @ViewDebug.IntToString(from = FOCUS_AFTER_DESCENDANTS, to = "FOCUS_AFTER_DESCENDANTS"), 473 @ViewDebug.IntToString(from = FOCUS_BLOCK_DESCENDANTS, to = "FOCUS_BLOCK_DESCENDANTS") 474 }) 475 public int getDescendantFocusability() { 476 return mGroupFlags & FLAG_MASK_FOCUSABILITY; 477 } 478 479 /** 480 * Set the descendant focusability of this view group. This defines the relationship 481 * between this view group and its descendants when looking for a view to 482 * take focus in {@link #requestFocus(int, android.graphics.Rect)}. 483 * 484 * @param focusability one of {@link #FOCUS_BEFORE_DESCENDANTS}, {@link #FOCUS_AFTER_DESCENDANTS}, 485 * {@link #FOCUS_BLOCK_DESCENDANTS}. 486 */ 487 public void setDescendantFocusability(int focusability) { 488 switch (focusability) { 489 case FOCUS_BEFORE_DESCENDANTS: 490 case FOCUS_AFTER_DESCENDANTS: 491 case FOCUS_BLOCK_DESCENDANTS: 492 break; 493 default: 494 throw new IllegalArgumentException("must be one of FOCUS_BEFORE_DESCENDANTS, " 495 + "FOCUS_AFTER_DESCENDANTS, FOCUS_BLOCK_DESCENDANTS"); 496 } 497 mGroupFlags &= ~FLAG_MASK_FOCUSABILITY; 498 mGroupFlags |= (focusability & FLAG_MASK_FOCUSABILITY); 499 } 500 501 /** 502 * {@inheritDoc} 503 */ 504 @Override 505 void handleFocusGainInternal(int direction, Rect previouslyFocusedRect) { 506 if (mFocused != null) { 507 mFocused.unFocus(); 508 mFocused = null; 509 } 510 super.handleFocusGainInternal(direction, previouslyFocusedRect); 511 } 512 513 /** 514 * {@inheritDoc} 515 */ 516 public void requestChildFocus(View child, View focused) { 517 if (DBG) { 518 System.out.println(this + " requestChildFocus()"); 519 } 520 if (getDescendantFocusability() == FOCUS_BLOCK_DESCENDANTS) { 521 return; 522 } 523 524 // Unfocus us, if necessary 525 super.unFocus(); 526 527 // We had a previous notion of who had focus. Clear it. 528 if (mFocused != child) { 529 if (mFocused != null) { 530 mFocused.unFocus(); 531 } 532 533 mFocused = child; 534 } 535 if (mParent != null) { 536 mParent.requestChildFocus(this, focused); 537 } 538 } 539 540 /** 541 * {@inheritDoc} 542 */ 543 public void focusableViewAvailable(View v) { 544 if (mParent != null 545 // shortcut: don't report a new focusable view if we block our descendants from 546 // getting focus 547 && (getDescendantFocusability() != FOCUS_BLOCK_DESCENDANTS) 548 // shortcut: don't report a new focusable view if we already are focused 549 // (and we don't prefer our descendants) 550 // 551 // note: knowing that mFocused is non-null is not a good enough reason 552 // to break the traversal since in that case we'd actually have to find 553 // the focused view and make sure it wasn't FOCUS_AFTER_DESCENDANTS and 554 // an ancestor of v; this will get checked for at ViewAncestor 555 && !(isFocused() && getDescendantFocusability() != FOCUS_AFTER_DESCENDANTS)) { 556 mParent.focusableViewAvailable(v); 557 } 558 } 559 560 /** 561 * {@inheritDoc} 562 */ 563 public boolean showContextMenuForChild(View originalView) { 564 return mParent != null && mParent.showContextMenuForChild(originalView); 565 } 566 567 /** 568 * {@inheritDoc} 569 */ 570 public ActionMode startActionModeForChild(View originalView, ActionMode.Callback callback) { 571 return mParent != null ? mParent.startActionModeForChild(originalView, callback) : null; 572 } 573 574 /** 575 * Find the nearest view in the specified direction that wants to take 576 * focus. 577 * 578 * @param focused The view that currently has focus 579 * @param direction One of FOCUS_UP, FOCUS_DOWN, FOCUS_LEFT, and 580 * FOCUS_RIGHT, or 0 for not applicable. 581 */ 582 public View focusSearch(View focused, int direction) { 583 if (isRootNamespace()) { 584 // root namespace means we should consider ourselves the top of the 585 // tree for focus searching; otherwise we could be focus searching 586 // into other tabs. see LocalActivityManager and TabHost for more info 587 return FocusFinder.getInstance().findNextFocus(this, focused, direction); 588 } else if (mParent != null) { 589 return mParent.focusSearch(focused, direction); 590 } 591 return null; 592 } 593 594 /** 595 * {@inheritDoc} 596 */ 597 public boolean requestChildRectangleOnScreen(View child, Rect rectangle, boolean immediate) { 598 return false; 599 } 600 601 /** 602 * {@inheritDoc} 603 */ 604 public boolean requestSendAccessibilityEvent(View child, AccessibilityEvent event) { 605 ViewParent parent = getParent(); 606 if (parent == null) { 607 return false; 608 } 609 final boolean propagate = onRequestSendAccessibilityEvent(child, event); 610 //noinspection SimplifiableIfStatement 611 if (!propagate) { 612 return false; 613 } 614 return parent.requestSendAccessibilityEvent(this, event); 615 } 616 617 /** 618 * Called when a child has requested sending an {@link AccessibilityEvent} and 619 * gives an opportunity to its parent to augment the event. 620 * <p> 621 * If an {@link android.view.View.AccessibilityDelegate} has been specified via calling 622 * {@link android.view.View#setAccessibilityDelegate(android.view.View.AccessibilityDelegate)} its 623 * {@link android.view.View.AccessibilityDelegate#onRequestSendAccessibilityEvent(ViewGroup, View, AccessibilityEvent)} 624 * is responsible for handling this call. 625 * </p> 626 * 627 * @param child The child which requests sending the event. 628 * @param event The event to be sent. 629 * @return True if the event should be sent. 630 * 631 * @see #requestSendAccessibilityEvent(View, AccessibilityEvent) 632 */ 633 public boolean onRequestSendAccessibilityEvent(View child, AccessibilityEvent event) { 634 if (mAccessibilityDelegate != null) { 635 return mAccessibilityDelegate.onRequestSendAccessibilityEvent(this, child, event); 636 } else { 637 return onRequestSendAccessibilityEventInternal(child, event); 638 } 639 } 640 641 /** 642 * @see #onRequestSendAccessibilityEvent(View, AccessibilityEvent) 643 * 644 * Note: Called from the default {@link View.AccessibilityDelegate}. 645 */ 646 boolean onRequestSendAccessibilityEventInternal(View child, AccessibilityEvent event) { 647 return true; 648 } 649 650 /** 651 * {@inheritDoc} 652 */ 653 @Override 654 public boolean dispatchUnhandledMove(View focused, int direction) { 655 return mFocused != null && 656 mFocused.dispatchUnhandledMove(focused, direction); 657 } 658 659 /** 660 * {@inheritDoc} 661 */ 662 public void clearChildFocus(View child) { 663 if (DBG) { 664 System.out.println(this + " clearChildFocus()"); 665 } 666 667 mFocused = null; 668 if (mParent != null) { 669 mParent.clearChildFocus(this); 670 } 671 } 672 673 /** 674 * {@inheritDoc} 675 */ 676 @Override 677 public void clearFocus() { 678 super.clearFocus(); 679 680 // clear any child focus if it exists 681 if (mFocused != null) { 682 mFocused.clearFocus(); 683 } 684 } 685 686 /** 687 * {@inheritDoc} 688 */ 689 @Override 690 void unFocus() { 691 if (DBG) { 692 System.out.println(this + " unFocus()"); 693 } 694 695 super.unFocus(); 696 if (mFocused != null) { 697 mFocused.unFocus(); 698 } 699 mFocused = null; 700 } 701 702 /** 703 * Returns the focused child of this view, if any. The child may have focus 704 * or contain focus. 705 * 706 * @return the focused child or null. 707 */ 708 public View getFocusedChild() { 709 return mFocused; 710 } 711 712 /** 713 * Returns true if this view has or contains focus 714 * 715 * @return true if this view has or contains focus 716 */ 717 @Override 718 public boolean hasFocus() { 719 return (mPrivateFlags & FOCUSED) != 0 || mFocused != null; 720 } 721 722 /* 723 * (non-Javadoc) 724 * 725 * @see android.view.View#findFocus() 726 */ 727 @Override 728 public View findFocus() { 729 if (DBG) { 730 System.out.println("Find focus in " + this + ": flags=" 731 + isFocused() + ", child=" + mFocused); 732 } 733 734 if (isFocused()) { 735 return this; 736 } 737 738 if (mFocused != null) { 739 return mFocused.findFocus(); 740 } 741 return null; 742 } 743 744 /** 745 * {@inheritDoc} 746 */ 747 @Override 748 public boolean hasFocusable() { 749 if ((mViewFlags & VISIBILITY_MASK) != VISIBLE) { 750 return false; 751 } 752 753 if (isFocusable()) { 754 return true; 755 } 756 757 final int descendantFocusability = getDescendantFocusability(); 758 if (descendantFocusability != FOCUS_BLOCK_DESCENDANTS) { 759 final int count = mChildrenCount; 760 final View[] children = mChildren; 761 762 for (int i = 0; i < count; i++) { 763 final View child = children[i]; 764 if (child.hasFocusable()) { 765 return true; 766 } 767 } 768 } 769 770 return false; 771 } 772 773 /** 774 * {@inheritDoc} 775 */ 776 @Override 777 public void addFocusables(ArrayList<View> views, int direction) { 778 addFocusables(views, direction, FOCUSABLES_TOUCH_MODE); 779 } 780 781 /** 782 * {@inheritDoc} 783 */ 784 @Override 785 public void addFocusables(ArrayList<View> views, int direction, int focusableMode) { 786 final int focusableCount = views.size(); 787 788 final int descendantFocusability = getDescendantFocusability(); 789 790 if (descendantFocusability != FOCUS_BLOCK_DESCENDANTS) { 791 final int count = mChildrenCount; 792 final View[] children = mChildren; 793 794 for (int i = 0; i < count; i++) { 795 final View child = children[i]; 796 if ((child.mViewFlags & VISIBILITY_MASK) == VISIBLE) { 797 child.addFocusables(views, direction, focusableMode); 798 } 799 } 800 } 801 802 // we add ourselves (if focusable) in all cases except for when we are 803 // FOCUS_AFTER_DESCENDANTS and there are some descendants focusable. this is 804 // to avoid the focus search finding layouts when a more precise search 805 // among the focusable children would be more interesting. 806 if ( 807 descendantFocusability != FOCUS_AFTER_DESCENDANTS || 808 // No focusable descendants 809 (focusableCount == views.size())) { 810 super.addFocusables(views, direction, focusableMode); 811 } 812 } 813 814 @Override 815 public void findViewsWithText(ArrayList<View> outViews, CharSequence text, int flags) { 816 super.findViewsWithText(outViews, text, flags); 817 final int childrenCount = mChildrenCount; 818 final View[] children = mChildren; 819 for (int i = 0; i < childrenCount; i++) { 820 View child = children[i]; 821 if ((child.mViewFlags & VISIBILITY_MASK) == VISIBLE 822 && (child.mPrivateFlags & IS_ROOT_NAMESPACE) == 0) { 823 child.findViewsWithText(outViews, text, flags); 824 } 825 } 826 } 827 828 @Override 829 View findViewByAccessibilityIdTraversal(int accessibilityId) { 830 View foundView = super.findViewByAccessibilityIdTraversal(accessibilityId); 831 if (foundView != null) { 832 return foundView; 833 } 834 final int childrenCount = mChildrenCount; 835 final View[] children = mChildren; 836 for (int i = 0; i < childrenCount; i++) { 837 View child = children[i]; 838 foundView = child.findViewByAccessibilityIdTraversal(accessibilityId); 839 if (foundView != null) { 840 return foundView; 841 } 842 } 843 return null; 844 } 845 846 /** 847 * {@inheritDoc} 848 */ 849 @Override 850 public void dispatchWindowFocusChanged(boolean hasFocus) { 851 super.dispatchWindowFocusChanged(hasFocus); 852 final int count = mChildrenCount; 853 final View[] children = mChildren; 854 for (int i = 0; i < count; i++) { 855 children[i].dispatchWindowFocusChanged(hasFocus); 856 } 857 } 858 859 /** 860 * {@inheritDoc} 861 */ 862 @Override 863 public void addTouchables(ArrayList<View> views) { 864 super.addTouchables(views); 865 866 final int count = mChildrenCount; 867 final View[] children = mChildren; 868 869 for (int i = 0; i < count; i++) { 870 final View child = children[i]; 871 if ((child.mViewFlags & VISIBILITY_MASK) == VISIBLE) { 872 child.addTouchables(views); 873 } 874 } 875 } 876 877 /** 878 * {@inheritDoc} 879 */ 880 @Override 881 public void dispatchDisplayHint(int hint) { 882 super.dispatchDisplayHint(hint); 883 final int count = mChildrenCount; 884 final View[] children = mChildren; 885 for (int i = 0; i < count; i++) { 886 children[i].dispatchDisplayHint(hint); 887 } 888 } 889 890 /** 891 * @hide 892 * @param child 893 * @param visibility 894 */ 895 protected void onChildVisibilityChanged(View child, int visibility) { 896 if (mTransition != null) { 897 if (visibility == VISIBLE) { 898 mTransition.showChild(this, child); 899 } else { 900 mTransition.hideChild(this, child); 901 } 902 if (visibility != VISIBLE) { 903 // Only track this on disappearing views - appearing views are already visible 904 // and don't need special handling during drawChild() 905 if (mVisibilityChangingChildren == null) { 906 mVisibilityChangingChildren = new ArrayList<View>(); 907 } 908 mVisibilityChangingChildren.add(child); 909 if (mTransitioningViews != null && mTransitioningViews.contains(child)) { 910 addDisappearingView(child); 911 } 912 } 913 } 914 915 // in all cases, for drags 916 if (mCurrentDrag != null) { 917 if (visibility == VISIBLE) { 918 notifyChildOfDrag(child); 919 } 920 } 921 } 922 923 /** 924 * {@inheritDoc} 925 */ 926 @Override 927 protected void dispatchVisibilityChanged(View changedView, int visibility) { 928 super.dispatchVisibilityChanged(changedView, visibility); 929 final int count = mChildrenCount; 930 final View[] children = mChildren; 931 for (int i = 0; i < count; i++) { 932 children[i].dispatchVisibilityChanged(changedView, visibility); 933 } 934 } 935 936 /** 937 * {@inheritDoc} 938 */ 939 @Override 940 public void dispatchWindowVisibilityChanged(int visibility) { 941 super.dispatchWindowVisibilityChanged(visibility); 942 final int count = mChildrenCount; 943 final View[] children = mChildren; 944 for (int i = 0; i < count; i++) { 945 children[i].dispatchWindowVisibilityChanged(visibility); 946 } 947 } 948 949 /** 950 * {@inheritDoc} 951 */ 952 @Override 953 public void dispatchConfigurationChanged(Configuration newConfig) { 954 super.dispatchConfigurationChanged(newConfig); 955 final int count = mChildrenCount; 956 final View[] children = mChildren; 957 for (int i = 0; i < count; i++) { 958 children[i].dispatchConfigurationChanged(newConfig); 959 } 960 } 961 962 /** 963 * {@inheritDoc} 964 */ 965 public void recomputeViewAttributes(View child) { 966 if (mAttachInfo != null && !mAttachInfo.mRecomputeGlobalAttributes) { 967 ViewParent parent = mParent; 968 if (parent != null) parent.recomputeViewAttributes(this); 969 } 970 } 971 972 @Override 973 void dispatchCollectViewAttributes(int visibility) { 974 visibility |= mViewFlags&VISIBILITY_MASK; 975 super.dispatchCollectViewAttributes(visibility); 976 final int count = mChildrenCount; 977 final View[] children = mChildren; 978 for (int i = 0; i < count; i++) { 979 children[i].dispatchCollectViewAttributes(visibility); 980 } 981 } 982 983 /** 984 * {@inheritDoc} 985 */ 986 public void bringChildToFront(View child) { 987 int index = indexOfChild(child); 988 if (index >= 0) { 989 removeFromArray(index); 990 addInArray(child, mChildrenCount); 991 child.mParent = this; 992 } 993 } 994 995 /** 996 * {@inheritDoc} 997 * 998 * !!! TODO: write real docs 999 */ 1000 @Override 1001 public boolean dispatchDragEvent(DragEvent event) { 1002 boolean retval = false; 1003 final float tx = event.mX; 1004 final float ty = event.mY; 1005 1006 ViewRootImpl root = getViewRootImpl(); 1007 1008 // Dispatch down the view hierarchy 1009 switch (event.mAction) { 1010 case DragEvent.ACTION_DRAG_STARTED: { 1011 // clear state to recalculate which views we drag over 1012 mCurrentDragView = null; 1013 1014 // Set up our tracking of drag-started notifications 1015 mCurrentDrag = DragEvent.obtain(event); 1016 if (mDragNotifiedChildren == null) { 1017 mDragNotifiedChildren = new HashSet<View>(); 1018 } else { 1019 mDragNotifiedChildren.clear(); 1020 } 1021 1022 // Now dispatch down to our children, caching the responses 1023 mChildAcceptsDrag = false; 1024 final int count = mChildrenCount; 1025 final View[] children = mChildren; 1026 for (int i = 0; i < count; i++) { 1027 final View child = children[i]; 1028 child.mPrivateFlags2 &= ~View.DRAG_MASK; 1029 if (child.getVisibility() == VISIBLE) { 1030 final boolean handled = notifyChildOfDrag(children[i]); 1031 if (handled) { 1032 mChildAcceptsDrag = true; 1033 } 1034 } 1035 } 1036 1037 // Return HANDLED if one of our children can accept the drag 1038 if (mChildAcceptsDrag) { 1039 retval = true; 1040 } 1041 } break; 1042 1043 case DragEvent.ACTION_DRAG_ENDED: { 1044 // Release the bookkeeping now that the drag lifecycle has ended 1045 if (mDragNotifiedChildren != null) { 1046 for (View child : mDragNotifiedChildren) { 1047 // If a child was notified about an ongoing drag, it's told that it's over 1048 child.dispatchDragEvent(event); 1049 child.mPrivateFlags2 &= ~View.DRAG_MASK; 1050 child.refreshDrawableState(); 1051 } 1052 1053 mDragNotifiedChildren.clear(); 1054 mCurrentDrag.recycle(); 1055 mCurrentDrag = null; 1056 } 1057 1058 // We consider drag-ended to have been handled if one of our children 1059 // had offered to handle the drag. 1060 if (mChildAcceptsDrag) { 1061 retval = true; 1062 } 1063 } break; 1064 1065 case DragEvent.ACTION_DRAG_LOCATION: { 1066 // Find the [possibly new] drag target 1067 final View target = findFrontmostDroppableChildAt(event.mX, event.mY, mLocalPoint); 1068 1069 // If we've changed apparent drag target, tell the view root which view 1070 // we're over now [for purposes of the eventual drag-recipient-changed 1071 // notifications to the framework] and tell the new target that the drag 1072 // has entered its bounds. The root will see setDragFocus() calls all 1073 // the way down to the final leaf view that is handling the LOCATION event 1074 // before reporting the new potential recipient to the framework. 1075 if (mCurrentDragView != target) { 1076 root.setDragFocus(target); 1077 1078 final int action = event.mAction; 1079 // If we've dragged off of a child view, send it the EXITED message 1080 if (mCurrentDragView != null) { 1081 final View view = mCurrentDragView; 1082 event.mAction = DragEvent.ACTION_DRAG_EXITED; 1083 view.dispatchDragEvent(event); 1084 view.mPrivateFlags2 &= ~View.DRAG_HOVERED; 1085 view.refreshDrawableState(); 1086 } 1087 mCurrentDragView = target; 1088 1089 // If we've dragged over a new child view, send it the ENTERED message 1090 if (target != null) { 1091 event.mAction = DragEvent.ACTION_DRAG_ENTERED; 1092 target.dispatchDragEvent(event); 1093 target.mPrivateFlags2 |= View.DRAG_HOVERED; 1094 target.refreshDrawableState(); 1095 } 1096 event.mAction = action; // restore the event's original state 1097 } 1098 1099 // Dispatch the actual drag location notice, localized into its coordinates 1100 if (target != null) { 1101 event.mX = mLocalPoint.x; 1102 event.mY = mLocalPoint.y; 1103 1104 retval = target.dispatchDragEvent(event); 1105 1106 event.mX = tx; 1107 event.mY = ty; 1108 } 1109 } break; 1110 1111 /* Entered / exited dispatch 1112 * 1113 * DRAG_ENTERED is not dispatched downwards from ViewGroup. The reason for this is 1114 * that we're about to get the corresponding LOCATION event, which we will use to 1115 * determine which of our children is the new target; at that point we will 1116 * push a DRAG_ENTERED down to the new target child [which may itself be a ViewGroup]. 1117 * 1118 * DRAG_EXITED *is* dispatched all the way down immediately: once we know the 1119 * drag has left this ViewGroup, we know by definition that every contained subview 1120 * is also no longer under the drag point. 1121 */ 1122 1123 case DragEvent.ACTION_DRAG_EXITED: { 1124 if (mCurrentDragView != null) { 1125 final View view = mCurrentDragView; 1126 view.dispatchDragEvent(event); 1127 view.mPrivateFlags2 &= ~View.DRAG_HOVERED; 1128 view.refreshDrawableState(); 1129 1130 mCurrentDragView = null; 1131 } 1132 } break; 1133 1134 case DragEvent.ACTION_DROP: { 1135 if (ViewDebug.DEBUG_DRAG) Log.d(View.VIEW_LOG_TAG, "Drop event: " + event); 1136 View target = findFrontmostDroppableChildAt(event.mX, event.mY, mLocalPoint); 1137 if (target != null) { 1138 if (ViewDebug.DEBUG_DRAG) Log.d(View.VIEW_LOG_TAG, " dispatch drop to " + target); 1139 event.mX = mLocalPoint.x; 1140 event.mY = mLocalPoint.y; 1141 retval = target.dispatchDragEvent(event); 1142 event.mX = tx; 1143 event.mY = ty; 1144 } else { 1145 if (ViewDebug.DEBUG_DRAG) { 1146 Log.d(View.VIEW_LOG_TAG, " not dropped on an accepting view"); 1147 } 1148 } 1149 } break; 1150 } 1151 1152 // If none of our children could handle the event, try here 1153 if (!retval) { 1154 // Call up to the View implementation that dispatches to installed listeners 1155 retval = super.dispatchDragEvent(event); 1156 } 1157 return retval; 1158 } 1159 1160 // Find the frontmost child view that lies under the given point, and calculate 1161 // the position within its own local coordinate system. 1162 View findFrontmostDroppableChildAt(float x, float y, PointF outLocalPoint) { 1163 final int count = mChildrenCount; 1164 final View[] children = mChildren; 1165 for (int i = count - 1; i >= 0; i--) { 1166 final View child = children[i]; 1167 if (!child.canAcceptDrag()) { 1168 continue; 1169 } 1170 1171 if (isTransformedTouchPointInView(x, y, child, outLocalPoint)) { 1172 return child; 1173 } 1174 } 1175 return null; 1176 } 1177 1178 boolean notifyChildOfDrag(View child) { 1179 if (ViewDebug.DEBUG_DRAG) { 1180 Log.d(View.VIEW_LOG_TAG, "Sending drag-started to view: " + child); 1181 } 1182 1183 boolean canAccept = false; 1184 if (! mDragNotifiedChildren.contains(child)) { 1185 mDragNotifiedChildren.add(child); 1186 canAccept = child.dispatchDragEvent(mCurrentDrag); 1187 if (canAccept && !child.canAcceptDrag()) { 1188 child.mPrivateFlags2 |= View.DRAG_CAN_ACCEPT; 1189 child.refreshDrawableState(); 1190 } 1191 } 1192 return canAccept; 1193 } 1194 1195 @Override 1196 public void dispatchSystemUiVisibilityChanged(int visible) { 1197 super.dispatchSystemUiVisibilityChanged(visible); 1198 1199 final int count = mChildrenCount; 1200 final View[] children = mChildren; 1201 for (int i=0; i <count; i++) { 1202 final View child = children[i]; 1203 child.dispatchSystemUiVisibilityChanged(visible); 1204 } 1205 } 1206 1207 @Override 1208 void updateLocalSystemUiVisibility(int localValue, int localChanges) { 1209 super.updateLocalSystemUiVisibility(localValue, localChanges); 1210 1211 final int count = mChildrenCount; 1212 final View[] children = mChildren; 1213 for (int i=0; i <count; i++) { 1214 final View child = children[i]; 1215 child.updateLocalSystemUiVisibility(localValue, localChanges); 1216 } 1217 } 1218 1219 /** 1220 * {@inheritDoc} 1221 */ 1222 @Override 1223 public boolean dispatchKeyEventPreIme(KeyEvent event) { 1224 if ((mPrivateFlags & (FOCUSED | HAS_BOUNDS)) == (FOCUSED | HAS_BOUNDS)) { 1225 return super.dispatchKeyEventPreIme(event); 1226 } else if (mFocused != null && (mFocused.mPrivateFlags & HAS_BOUNDS) == HAS_BOUNDS) { 1227 return mFocused.dispatchKeyEventPreIme(event); 1228 } 1229 return false; 1230 } 1231 1232 /** 1233 * {@inheritDoc} 1234 */ 1235 @Override 1236 public boolean dispatchKeyEvent(KeyEvent event) { 1237 if (mInputEventConsistencyVerifier != null) { 1238 mInputEventConsistencyVerifier.onKeyEvent(event, 1); 1239 } 1240 1241 if ((mPrivateFlags & (FOCUSED | HAS_BOUNDS)) == (FOCUSED | HAS_BOUNDS)) { 1242 if (super.dispatchKeyEvent(event)) { 1243 return true; 1244 } 1245 } else if (mFocused != null && (mFocused.mPrivateFlags & HAS_BOUNDS) == HAS_BOUNDS) { 1246 if (mFocused.dispatchKeyEvent(event)) { 1247 return true; 1248 } 1249 } 1250 1251 if (mInputEventConsistencyVerifier != null) { 1252 mInputEventConsistencyVerifier.onUnhandledEvent(event, 1); 1253 } 1254 return false; 1255 } 1256 1257 /** 1258 * {@inheritDoc} 1259 */ 1260 @Override 1261 public boolean dispatchKeyShortcutEvent(KeyEvent event) { 1262 if ((mPrivateFlags & (FOCUSED | HAS_BOUNDS)) == (FOCUSED | HAS_BOUNDS)) { 1263 return super.dispatchKeyShortcutEvent(event); 1264 } else if (mFocused != null && (mFocused.mPrivateFlags & HAS_BOUNDS) == HAS_BOUNDS) { 1265 return mFocused.dispatchKeyShortcutEvent(event); 1266 } 1267 return false; 1268 } 1269 1270 /** 1271 * {@inheritDoc} 1272 */ 1273 @Override 1274 public boolean dispatchTrackballEvent(MotionEvent event) { 1275 if (mInputEventConsistencyVerifier != null) { 1276 mInputEventConsistencyVerifier.onTrackballEvent(event, 1); 1277 } 1278 1279 if ((mPrivateFlags & (FOCUSED | HAS_BOUNDS)) == (FOCUSED | HAS_BOUNDS)) { 1280 if (super.dispatchTrackballEvent(event)) { 1281 return true; 1282 } 1283 } else if (mFocused != null && (mFocused.mPrivateFlags & HAS_BOUNDS) == HAS_BOUNDS) { 1284 if (mFocused.dispatchTrackballEvent(event)) { 1285 return true; 1286 } 1287 } 1288 1289 if (mInputEventConsistencyVerifier != null) { 1290 mInputEventConsistencyVerifier.onUnhandledEvent(event, 1); 1291 } 1292 return false; 1293 } 1294 1295 /** 1296 * {@inheritDoc} 1297 */ 1298 @SuppressWarnings({"ConstantConditions"}) 1299 @Override 1300 protected boolean dispatchHoverEvent(MotionEvent event) { 1301 final int action = event.getAction(); 1302 1303 // First check whether the view group wants to intercept the hover event. 1304 final boolean interceptHover = onInterceptHoverEvent(event); 1305 event.setAction(action); // restore action in case it was changed 1306 1307 MotionEvent eventNoHistory = event; 1308 boolean handled = false; 1309 1310 // Send events to the hovered children and build a new list of hover targets until 1311 // one is found that handles the event. 1312 HoverTarget firstOldHoverTarget = mFirstHoverTarget; 1313 mFirstHoverTarget = null; 1314 if (!interceptHover && action != MotionEvent.ACTION_HOVER_EXIT) { 1315 final float x = event.getX(); 1316 final float y = event.getY(); 1317 final int childrenCount = mChildrenCount; 1318 if (childrenCount != 0) { 1319 final View[] children = mChildren; 1320 HoverTarget lastHoverTarget = null; 1321 for (int i = childrenCount - 1; i >= 0; i--) { 1322 final View child = children[i]; 1323 if (!canViewReceivePointerEvents(child) 1324 || !isTransformedTouchPointInView(x, y, child, null)) { 1325 continue; 1326 } 1327 1328 // Obtain a hover target for this child. Dequeue it from the 1329 // old hover target list if the child was previously hovered. 1330 HoverTarget hoverTarget = firstOldHoverTarget; 1331 final boolean wasHovered; 1332 for (HoverTarget predecessor = null; ;) { 1333 if (hoverTarget == null) { 1334 hoverTarget = HoverTarget.obtain(child); 1335 wasHovered = false; 1336 break; 1337 } 1338 1339 if (hoverTarget.child == child) { 1340 if (predecessor != null) { 1341 predecessor.next = hoverTarget.next; 1342 } else { 1343 firstOldHoverTarget = hoverTarget.next; 1344 } 1345 hoverTarget.next = null; 1346 wasHovered = true; 1347 break; 1348 } 1349 1350 predecessor = hoverTarget; 1351 hoverTarget = hoverTarget.next; 1352 } 1353 1354 // Enqueue the hover target onto the new hover target list. 1355 if (lastHoverTarget != null) { 1356 lastHoverTarget.next = hoverTarget; 1357 } else { 1358 lastHoverTarget = hoverTarget; 1359 mFirstHoverTarget = hoverTarget; 1360 } 1361 1362 // Dispatch the event to the child. 1363 if (action == MotionEvent.ACTION_HOVER_ENTER) { 1364 if (!wasHovered) { 1365 // Send the enter as is. 1366 handled |= dispatchTransformedGenericPointerEvent( 1367 event, child); // enter 1368 } 1369 } else if (action == MotionEvent.ACTION_HOVER_MOVE) { 1370 if (!wasHovered) { 1371 // Synthesize an enter from a move. 1372 eventNoHistory = obtainMotionEventNoHistoryOrSelf(eventNoHistory); 1373 eventNoHistory.setAction(MotionEvent.ACTION_HOVER_ENTER); 1374 handled |= dispatchTransformedGenericPointerEvent( 1375 eventNoHistory, child); // enter 1376 eventNoHistory.setAction(action); 1377 1378 handled |= dispatchTransformedGenericPointerEvent( 1379 eventNoHistory, child); // move 1380 } else { 1381 // Send the move as is. 1382 handled |= dispatchTransformedGenericPointerEvent(event, child); 1383 } 1384 } 1385 if (handled) { 1386 break; 1387 } 1388 } 1389 } 1390 } 1391 1392 // Send exit events to all previously hovered children that are no longer hovered. 1393 while (firstOldHoverTarget != null) { 1394 final View child = firstOldHoverTarget.child; 1395 1396 // Exit the old hovered child. 1397 if (action == MotionEvent.ACTION_HOVER_EXIT) { 1398 // Send the exit as is. 1399 handled |= dispatchTransformedGenericPointerEvent( 1400 event, child); // exit 1401 } else { 1402 // Synthesize an exit from a move or enter. 1403 // Ignore the result because hover focus has moved to a different view. 1404 if (action == MotionEvent.ACTION_HOVER_MOVE) { 1405 dispatchTransformedGenericPointerEvent( 1406 event, child); // move 1407 } 1408 eventNoHistory = obtainMotionEventNoHistoryOrSelf(eventNoHistory); 1409 eventNoHistory.setAction(MotionEvent.ACTION_HOVER_EXIT); 1410 dispatchTransformedGenericPointerEvent( 1411 eventNoHistory, child); // exit 1412 eventNoHistory.setAction(action); 1413 } 1414 1415 final HoverTarget nextOldHoverTarget = firstOldHoverTarget.next; 1416 firstOldHoverTarget.recycle(); 1417 firstOldHoverTarget = nextOldHoverTarget; 1418 } 1419 1420 // Send events to the view group itself if no children have handled it. 1421 boolean newHoveredSelf = !handled; 1422 if (newHoveredSelf == mHoveredSelf) { 1423 if (newHoveredSelf) { 1424 // Send event to the view group as before. 1425 handled |= super.dispatchHoverEvent(event); 1426 } 1427 } else { 1428 if (mHoveredSelf) { 1429 // Exit the view group. 1430 if (action == MotionEvent.ACTION_HOVER_EXIT) { 1431 // Send the exit as is. 1432 handled |= super.dispatchHoverEvent(event); // exit 1433 } else { 1434 // Synthesize an exit from a move or enter. 1435 // Ignore the result because hover focus is moving to a different view. 1436 if (action == MotionEvent.ACTION_HOVER_MOVE) { 1437 super.dispatchHoverEvent(event); // move 1438 } 1439 eventNoHistory = obtainMotionEventNoHistoryOrSelf(eventNoHistory); 1440 eventNoHistory.setAction(MotionEvent.ACTION_HOVER_EXIT); 1441 super.dispatchHoverEvent(eventNoHistory); // exit 1442 eventNoHistory.setAction(action); 1443 } 1444 mHoveredSelf = false; 1445 } 1446 1447 if (newHoveredSelf) { 1448 // Enter the view group. 1449 if (action == MotionEvent.ACTION_HOVER_ENTER) { 1450 // Send the enter as is. 1451 handled |= super.dispatchHoverEvent(event); // enter 1452 mHoveredSelf = true; 1453 } else if (action == MotionEvent.ACTION_HOVER_MOVE) { 1454 // Synthesize an enter from a move. 1455 eventNoHistory = obtainMotionEventNoHistoryOrSelf(eventNoHistory); 1456 eventNoHistory.setAction(MotionEvent.ACTION_HOVER_ENTER); 1457 handled |= super.dispatchHoverEvent(eventNoHistory); // enter 1458 eventNoHistory.setAction(action); 1459 1460 handled |= super.dispatchHoverEvent(eventNoHistory); // move 1461 mHoveredSelf = true; 1462 } 1463 } 1464 } 1465 1466 // Recycle the copy of the event that we made. 1467 if (eventNoHistory != event) { 1468 eventNoHistory.recycle(); 1469 } 1470 1471 // Done. 1472 return handled; 1473 } 1474 1475 /** @hide */ 1476 @Override 1477 protected boolean hasHoveredChild() { 1478 return mFirstHoverTarget != null; 1479 } 1480 1481 /** 1482 * Implement this method to intercept hover events before they are handled 1483 * by child views. 1484 * <p> 1485 * This method is called before dispatching a hover event to a child of 1486 * the view group or to the view group's own {@link #onHoverEvent} to allow 1487 * the view group a chance to intercept the hover event. 1488 * This method can also be used to watch all pointer motions that occur within 1489 * the bounds of the view group even when the pointer is hovering over 1490 * a child of the view group rather than over the view group itself. 1491 * </p><p> 1492 * The view group can prevent its children from receiving hover events by 1493 * implementing this method and returning <code>true</code> to indicate 1494 * that it would like to intercept hover events. The view group must 1495 * continuously return <code>true</code> from {@link #onInterceptHoverEvent} 1496 * for as long as it wishes to continue intercepting hover events from 1497 * its children. 1498 * </p><p> 1499 * Interception preserves the invariant that at most one view can be 1500 * hovered at a time by transferring hover focus from the currently hovered 1501 * child to the view group or vice-versa as needed. 1502 * </p><p> 1503 * If this method returns <code>true</code> and a child is already hovered, then the 1504 * child view will first receive a hover exit event and then the view group 1505 * itself will receive a hover enter event in {@link #onHoverEvent}. 1506 * Likewise, if this method had previously returned <code>true</code> to intercept hover 1507 * events and instead returns <code>false</code> while the pointer is hovering 1508 * within the bounds of one of a child, then the view group will first receive a 1509 * hover exit event in {@link #onHoverEvent} and then the hovered child will 1510 * receive a hover enter event. 1511 * </p><p> 1512 * The default implementation always returns false. 1513 * </p> 1514 * 1515 * @param event The motion event that describes the hover. 1516 * @return True if the view group would like to intercept the hover event 1517 * and prevent its children from receiving it. 1518 */ 1519 public boolean onInterceptHoverEvent(MotionEvent event) { 1520 return false; 1521 } 1522 1523 private static MotionEvent obtainMotionEventNoHistoryOrSelf(MotionEvent event) { 1524 if (event.getHistorySize() == 0) { 1525 return event; 1526 } 1527 return MotionEvent.obtainNoHistory(event); 1528 } 1529 1530 /** 1531 * {@inheritDoc} 1532 */ 1533 @Override 1534 protected boolean dispatchGenericPointerEvent(MotionEvent event) { 1535 // Send the event to the child under the pointer. 1536 final int childrenCount = mChildrenCount; 1537 if (childrenCount != 0) { 1538 final View[] children = mChildren; 1539 final float x = event.getX(); 1540 final float y = event.getY(); 1541 1542 for (int i = childrenCount - 1; i >= 0; i--) { 1543 final View child = children[i]; 1544 if (!canViewReceivePointerEvents(child) 1545 || !isTransformedTouchPointInView(x, y, child, null)) { 1546 continue; 1547 } 1548 1549 if (dispatchTransformedGenericPointerEvent(event, child)) { 1550 return true; 1551 } 1552 } 1553 } 1554 1555 // No child handled the event. Send it to this view group. 1556 return super.dispatchGenericPointerEvent(event); 1557 } 1558 1559 /** 1560 * {@inheritDoc} 1561 */ 1562 @Override 1563 protected boolean dispatchGenericFocusedEvent(MotionEvent event) { 1564 // Send the event to the focused child or to this view group if it has focus. 1565 if ((mPrivateFlags & (FOCUSED | HAS_BOUNDS)) == (FOCUSED | HAS_BOUNDS)) { 1566 return super.dispatchGenericFocusedEvent(event); 1567 } else if (mFocused != null && (mFocused.mPrivateFlags & HAS_BOUNDS) == HAS_BOUNDS) { 1568 return mFocused.dispatchGenericMotionEvent(event); 1569 } 1570 return false; 1571 } 1572 1573 /** 1574 * Dispatches a generic pointer event to a child, taking into account 1575 * transformations that apply to the child. 1576 * 1577 * @param event The event to send. 1578 * @param child The view to send the event to. 1579 * @return {@code true} if the child handled the event. 1580 */ 1581 private boolean dispatchTransformedGenericPointerEvent(MotionEvent event, View child) { 1582 final float offsetX = mScrollX - child.mLeft; 1583 final float offsetY = mScrollY - child.mTop; 1584 1585 boolean handled; 1586 if (!child.hasIdentityMatrix()) { 1587 MotionEvent transformedEvent = MotionEvent.obtain(event); 1588 transformedEvent.offsetLocation(offsetX, offsetY); 1589 transformedEvent.transform(child.getInverseMatrix()); 1590 handled = child.dispatchGenericMotionEvent(transformedEvent); 1591 transformedEvent.recycle(); 1592 } else { 1593 event.offsetLocation(offsetX, offsetY); 1594 handled = child.dispatchGenericMotionEvent(event); 1595 event.offsetLocation(-offsetX, -offsetY); 1596 } 1597 return handled; 1598 } 1599 1600 /** 1601 * {@inheritDoc} 1602 */ 1603 @Override 1604 public boolean dispatchTouchEvent(MotionEvent ev) { 1605 if (mInputEventConsistencyVerifier != null) { 1606 mInputEventConsistencyVerifier.onTouchEvent(ev, 1); 1607 } 1608 1609 boolean handled = false; 1610 if (onFilterTouchEventForSecurity(ev)) { 1611 final int action = ev.getAction(); 1612 final int actionMasked = action & MotionEvent.ACTION_MASK; 1613 1614 // Handle an initial down. 1615 if (actionMasked == MotionEvent.ACTION_DOWN) { 1616 // Throw away all previous state when starting a new touch gesture. 1617 // The framework may have dropped the up or cancel event for the previous gesture 1618 // due to an app switch, ANR, or some other state change. 1619 cancelAndClearTouchTargets(ev); 1620 resetTouchState(); 1621 } 1622 1623 // Check for interception. 1624 final boolean intercepted; 1625 if (actionMasked == MotionEvent.ACTION_DOWN 1626 || mFirstTouchTarget != null) { 1627 final boolean disallowIntercept = (mGroupFlags & FLAG_DISALLOW_INTERCEPT) != 0; 1628 if (!disallowIntercept) { 1629 intercepted = onInterceptTouchEvent(ev); 1630 ev.setAction(action); // restore action in case it was changed 1631 } else { 1632 intercepted = false; 1633 } 1634 } else { 1635 // There are no touch targets and this action is not an initial down 1636 // so this view group continues to intercept touches. 1637 intercepted = true; 1638 } 1639 1640 // Check for cancelation. 1641 final boolean canceled = resetCancelNextUpFlag(this) 1642 || actionMasked == MotionEvent.ACTION_CANCEL; 1643 1644 // Update list of touch targets for pointer down, if needed. 1645 final boolean split = (mGroupFlags & FLAG_SPLIT_MOTION_EVENTS) != 0; 1646 TouchTarget newTouchTarget = null; 1647 boolean alreadyDispatchedToNewTouchTarget = false; 1648 if (!canceled && !intercepted) { 1649 if (actionMasked == MotionEvent.ACTION_DOWN 1650 || (split && actionMasked == MotionEvent.ACTION_POINTER_DOWN) 1651 || actionMasked == MotionEvent.ACTION_HOVER_MOVE) { 1652 final int actionIndex = ev.getActionIndex(); // always 0 for down 1653 final int idBitsToAssign = split ? 1 << ev.getPointerId(actionIndex) 1654 : TouchTarget.ALL_POINTER_IDS; 1655 1656 // Clean up earlier touch targets for this pointer id in case they 1657 // have become out of sync. 1658 removePointersFromTouchTargets(idBitsToAssign); 1659 1660 final int childrenCount = mChildrenCount; 1661 if (childrenCount != 0) { 1662 // Find a child that can receive the event. 1663 // Scan children from front to back. 1664 final View[] children = mChildren; 1665 final float x = ev.getX(actionIndex); 1666 final float y = ev.getY(actionIndex); 1667 1668 for (int i = childrenCount - 1; i >= 0; i--) { 1669 final View child = children[i]; 1670 if (!canViewReceivePointerEvents(child) 1671 || !isTransformedTouchPointInView(x, y, child, null)) { 1672 continue; 1673 } 1674 1675 newTouchTarget = getTouchTarget(child); 1676 if (newTouchTarget != null) { 1677 // Child is already receiving touch within its bounds. 1678 // Give it the new pointer in addition to the ones it is handling. 1679 newTouchTarget.pointerIdBits |= idBitsToAssign; 1680 break; 1681 } 1682 1683 resetCancelNextUpFlag(child); 1684 if (dispatchTransformedTouchEvent(ev, false, child, idBitsToAssign)) { 1685 // Child wants to receive touch within its bounds. 1686 mLastTouchDownTime = ev.getDownTime(); 1687 mLastTouchDownIndex = i; 1688 mLastTouchDownX = ev.getX(); 1689 mLastTouchDownY = ev.getY(); 1690 newTouchTarget = addTouchTarget(child, idBitsToAssign); 1691 alreadyDispatchedToNewTouchTarget = true; 1692 break; 1693 } 1694 } 1695 } 1696 1697 if (newTouchTarget == null && mFirstTouchTarget != null) { 1698 // Did not find a child to receive the event. 1699 // Assign the pointer to the least recently added target. 1700 newTouchTarget = mFirstTouchTarget; 1701 while (newTouchTarget.next != null) { 1702 newTouchTarget = newTouchTarget.next; 1703 } 1704 newTouchTarget.pointerIdBits |= idBitsToAssign; 1705 } 1706 } 1707 } 1708 1709 // Dispatch to touch targets. 1710 if (mFirstTouchTarget == null) { 1711 // No touch targets so treat this as an ordinary view. 1712 handled = dispatchTransformedTouchEvent(ev, canceled, null, 1713 TouchTarget.ALL_POINTER_IDS); 1714 } else { 1715 // Dispatch to touch targets, excluding the new touch target if we already 1716 // dispatched to it. Cancel touch targets if necessary. 1717 TouchTarget predecessor = null; 1718 TouchTarget target = mFirstTouchTarget; 1719 while (target != null) { 1720 final TouchTarget next = target.next; 1721 if (alreadyDispatchedToNewTouchTarget && target == newTouchTarget) { 1722 handled = true; 1723 } else { 1724 final boolean cancelChild = resetCancelNextUpFlag(target.child) 1725 || intercepted; 1726 if (dispatchTransformedTouchEvent(ev, cancelChild, 1727 target.child, target.pointerIdBits)) { 1728 handled = true; 1729 } 1730 if (cancelChild) { 1731 if (predecessor == null) { 1732 mFirstTouchTarget = next; 1733 } else { 1734 predecessor.next = next; 1735 } 1736 target.recycle(); 1737 target = next; 1738 continue; 1739 } 1740 } 1741 predecessor = target; 1742 target = next; 1743 } 1744 } 1745 1746 // Update list of touch targets for pointer up or cancel, if needed. 1747 if (canceled 1748 || actionMasked == MotionEvent.ACTION_UP 1749 || actionMasked == MotionEvent.ACTION_HOVER_MOVE) { 1750 resetTouchState(); 1751 } else if (split && actionMasked == MotionEvent.ACTION_POINTER_UP) { 1752 final int actionIndex = ev.getActionIndex(); 1753 final int idBitsToRemove = 1 << ev.getPointerId(actionIndex); 1754 removePointersFromTouchTargets(idBitsToRemove); 1755 } 1756 } 1757 1758 if (!handled && mInputEventConsistencyVerifier != null) { 1759 mInputEventConsistencyVerifier.onUnhandledEvent(ev, 1); 1760 } 1761 return handled; 1762 } 1763 1764 /** 1765 * Resets all touch state in preparation for a new cycle. 1766 */ 1767 private void resetTouchState() { 1768 clearTouchTargets(); 1769 resetCancelNextUpFlag(this); 1770 mGroupFlags &= ~FLAG_DISALLOW_INTERCEPT; 1771 } 1772 1773 /** 1774 * Resets the cancel next up flag. 1775 * Returns true if the flag was previously set. 1776 */ 1777 private boolean resetCancelNextUpFlag(View view) { 1778 if ((view.mPrivateFlags & CANCEL_NEXT_UP_EVENT) != 0) { 1779 view.mPrivateFlags &= ~CANCEL_NEXT_UP_EVENT; 1780 return true; 1781 } 1782 return false; 1783 } 1784 1785 /** 1786 * Clears all touch targets. 1787 */ 1788 private void clearTouchTargets() { 1789 TouchTarget target = mFirstTouchTarget; 1790 if (target != null) { 1791 do { 1792 TouchTarget next = target.next; 1793 target.recycle(); 1794 target = next; 1795 } while (target != null); 1796 mFirstTouchTarget = null; 1797 } 1798 } 1799 1800 /** 1801 * Cancels and clears all touch targets. 1802 */ 1803 private void cancelAndClearTouchTargets(MotionEvent event) { 1804 if (mFirstTouchTarget != null) { 1805 boolean syntheticEvent = false; 1806 if (event == null) { 1807 final long now = SystemClock.uptimeMillis(); 1808 event = MotionEvent.obtain(now, now, 1809 MotionEvent.ACTION_CANCEL, 0.0f, 0.0f, 0); 1810 event.setSource(InputDevice.SOURCE_TOUCHSCREEN); 1811 syntheticEvent = true; 1812 } 1813 1814 for (TouchTarget target = mFirstTouchTarget; target != null; target = target.next) { 1815 resetCancelNextUpFlag(target.child); 1816 dispatchTransformedTouchEvent(event, true, target.child, target.pointerIdBits); 1817 } 1818 clearTouchTargets(); 1819 1820 if (syntheticEvent) { 1821 event.recycle(); 1822 } 1823 } 1824 } 1825 1826 /** 1827 * Gets the touch target for specified child view. 1828 * Returns null if not found. 1829 */ 1830 private TouchTarget getTouchTarget(View child) { 1831 for (TouchTarget target = mFirstTouchTarget; target != null; target = target.next) { 1832 if (target.child == child) { 1833 return target; 1834 } 1835 } 1836 return null; 1837 } 1838 1839 /** 1840 * Adds a touch target for specified child to the beginning of the list. 1841 * Assumes the target child is not already present. 1842 */ 1843 private TouchTarget addTouchTarget(View child, int pointerIdBits) { 1844 TouchTarget target = TouchTarget.obtain(child, pointerIdBits); 1845 target.next = mFirstTouchTarget; 1846 mFirstTouchTarget = target; 1847 return target; 1848 } 1849 1850 /** 1851 * Removes the pointer ids from consideration. 1852 */ 1853 private void removePointersFromTouchTargets(int pointerIdBits) { 1854 TouchTarget predecessor = null; 1855 TouchTarget target = mFirstTouchTarget; 1856 while (target != null) { 1857 final TouchTarget next = target.next; 1858 if ((target.pointerIdBits & pointerIdBits) != 0) { 1859 target.pointerIdBits &= ~pointerIdBits; 1860 if (target.pointerIdBits == 0) { 1861 if (predecessor == null) { 1862 mFirstTouchTarget = next; 1863 } else { 1864 predecessor.next = next; 1865 } 1866 target.recycle(); 1867 target = next; 1868 continue; 1869 } 1870 } 1871 predecessor = target; 1872 target = next; 1873 } 1874 } 1875 1876 /** 1877 * Returns true if a child view can receive pointer events. 1878 * @hide 1879 */ 1880 private static boolean canViewReceivePointerEvents(View child) { 1881 return (child.mViewFlags & VISIBILITY_MASK) == VISIBLE 1882 || child.getAnimation() != null; 1883 } 1884 1885 /** 1886 * Returns true if a child view contains the specified point when transformed 1887 * into its coordinate space. 1888 * Child must not be null. 1889 * @hide 1890 */ 1891 protected boolean isTransformedTouchPointInView(float x, float y, View child, 1892 PointF outLocalPoint) { 1893 float localX = x + mScrollX - child.mLeft; 1894 float localY = y + mScrollY - child.mTop; 1895 if (! child.hasIdentityMatrix() && mAttachInfo != null) { 1896 final float[] localXY = mAttachInfo.mTmpTransformLocation; 1897 localXY[0] = localX; 1898 localXY[1] = localY; 1899 child.getInverseMatrix().mapPoints(localXY); 1900 localX = localXY[0]; 1901 localY = localXY[1]; 1902 } 1903 final boolean isInView = child.pointInView(localX, localY); 1904 if (isInView && outLocalPoint != null) { 1905 outLocalPoint.set(localX, localY); 1906 } 1907 return isInView; 1908 } 1909 1910 /** 1911 * Transforms a motion event into the coordinate space of a particular child view, 1912 * filters out irrelevant pointer ids, and overrides its action if necessary. 1913 * If child is null, assumes the MotionEvent will be sent to this ViewGroup instead. 1914 */ 1915 private boolean dispatchTransformedTouchEvent(MotionEvent event, boolean cancel, 1916 View child, int desiredPointerIdBits) { 1917 final boolean handled; 1918 1919 // Canceling motions is a special case. We don't need to perform any transformations 1920 // or filtering. The important part is the action, not the contents. 1921 final int oldAction = event.getAction(); 1922 if (cancel || oldAction == MotionEvent.ACTION_CANCEL) { 1923 event.setAction(MotionEvent.ACTION_CANCEL); 1924 if (child == null) { 1925 handled = super.dispatchTouchEvent(event); 1926 } else { 1927 handled = child.dispatchTouchEvent(event); 1928 } 1929 event.setAction(oldAction); 1930 return handled; 1931 } 1932 1933 // Calculate the number of pointers to deliver. 1934 final int oldPointerIdBits = event.getPointerIdBits(); 1935 final int newPointerIdBits = oldPointerIdBits & desiredPointerIdBits; 1936 1937 // If for some reason we ended up in an inconsistent state where it looks like we 1938 // might produce a motion event with no pointers in it, then drop the event. 1939 if (newPointerIdBits == 0) { 1940 return false; 1941 } 1942 1943 // If the number of pointers is the same and we don't need to perform any fancy 1944 // irreversible transformations, then we can reuse the motion event for this 1945 // dispatch as long as we are careful to revert any changes we make. 1946 // Otherwise we need to make a copy. 1947 final MotionEvent transformedEvent; 1948 if (newPointerIdBits == oldPointerIdBits) { 1949 if (child == null || child.hasIdentityMatrix()) { 1950 if (child == null) { 1951 handled = super.dispatchTouchEvent(event); 1952 } else { 1953 final float offsetX = mScrollX - child.mLeft; 1954 final float offsetY = mScrollY - child.mTop; 1955 event.offsetLocation(offsetX, offsetY); 1956 1957 handled = child.dispatchTouchEvent(event); 1958 1959 event.offsetLocation(-offsetX, -offsetY); 1960 } 1961 return handled; 1962 } 1963 transformedEvent = MotionEvent.obtain(event); 1964 } else { 1965 transformedEvent = event.split(newPointerIdBits); 1966 } 1967 1968 // Perform any necessary transformations and dispatch. 1969 if (child == null) { 1970 handled = super.dispatchTouchEvent(transformedEvent); 1971 } else { 1972 final float offsetX = mScrollX - child.mLeft; 1973 final float offsetY = mScrollY - child.mTop; 1974 transformedEvent.offsetLocation(offsetX, offsetY); 1975 if (! child.hasIdentityMatrix()) { 1976 transformedEvent.transform(child.getInverseMatrix()); 1977 } 1978 1979 handled = child.dispatchTouchEvent(transformedEvent); 1980 } 1981 1982 // Done. 1983 transformedEvent.recycle(); 1984 return handled; 1985 } 1986 1987 /** 1988 * Enable or disable the splitting of MotionEvents to multiple children during touch event 1989 * dispatch. This behavior is enabled by default for applications that target an 1990 * SDK version of {@link Build.VERSION_CODES#HONEYCOMB} or newer. 1991 * 1992 * <p>When this option is enabled MotionEvents may be split and dispatched to different child 1993 * views depending on where each pointer initially went down. This allows for user interactions 1994 * such as scrolling two panes of content independently, chording of buttons, and performing 1995 * independent gestures on different pieces of content. 1996 * 1997 * @param split <code>true</code> to allow MotionEvents to be split and dispatched to multiple 1998 * child views. <code>false</code> to only allow one child view to be the target of 1999 * any MotionEvent received by this ViewGroup. 2000 */ 2001 public void setMotionEventSplittingEnabled(boolean split) { 2002 // TODO Applications really shouldn't change this setting mid-touch event, 2003 // but perhaps this should handle that case and send ACTION_CANCELs to any child views 2004 // with gestures in progress when this is changed. 2005 if (split) { 2006 mGroupFlags |= FLAG_SPLIT_MOTION_EVENTS; 2007 } else { 2008 mGroupFlags &= ~FLAG_SPLIT_MOTION_EVENTS; 2009 } 2010 } 2011 2012 /** 2013 * Returns true if MotionEvents dispatched to this ViewGroup can be split to multiple children. 2014 * @return true if MotionEvents dispatched to this ViewGroup can be split to multiple children. 2015 */ 2016 public boolean isMotionEventSplittingEnabled() { 2017 return (mGroupFlags & FLAG_SPLIT_MOTION_EVENTS) == FLAG_SPLIT_MOTION_EVENTS; 2018 } 2019 2020 /** 2021 * {@inheritDoc} 2022 */ 2023 public void requestDisallowInterceptTouchEvent(boolean disallowIntercept) { 2024 2025 if (disallowIntercept == ((mGroupFlags & FLAG_DISALLOW_INTERCEPT) != 0)) { 2026 // We're already in this state, assume our ancestors are too 2027 return; 2028 } 2029 2030 if (disallowIntercept) { 2031 mGroupFlags |= FLAG_DISALLOW_INTERCEPT; 2032 } else { 2033 mGroupFlags &= ~FLAG_DISALLOW_INTERCEPT; 2034 } 2035 2036 // Pass it up to our parent 2037 if (mParent != null) { 2038 mParent.requestDisallowInterceptTouchEvent(disallowIntercept); 2039 } 2040 } 2041 2042 /** 2043 * Implement this method to intercept all touch screen motion events. This 2044 * allows you to watch events as they are dispatched to your children, and 2045 * take ownership of the current gesture at any point. 2046 * 2047 * <p>Using this function takes some care, as it has a fairly complicated 2048 * interaction with {@link View#onTouchEvent(MotionEvent) 2049 * View.onTouchEvent(MotionEvent)}, and using it requires implementing 2050 * that method as well as this one in the correct way. Events will be 2051 * received in the following order: 2052 * 2053 * <ol> 2054 * <li> You will receive the down event here. 2055 * <li> The down event will be handled either by a child of this view 2056 * group, or given to your own onTouchEvent() method to handle; this means 2057 * you should implement onTouchEvent() to return true, so you will 2058 * continue to see the rest of the gesture (instead of looking for 2059 * a parent view to handle it). Also, by returning true from 2060 * onTouchEvent(), you will not receive any following 2061 * events in onInterceptTouchEvent() and all touch processing must 2062 * happen in onTouchEvent() like normal. 2063 * <li> For as long as you return false from this function, each following 2064 * event (up to and including the final up) will be delivered first here 2065 * and then to the target's onTouchEvent(). 2066 * <li> If you return true from here, you will not receive any 2067 * following events: the target view will receive the same event but 2068 * with the action {@link MotionEvent#ACTION_CANCEL}, and all further 2069 * events will be delivered to your onTouchEvent() method and no longer 2070 * appear here. 2071 * </ol> 2072 * 2073 * @param ev The motion event being dispatched down the hierarchy. 2074 * @return Return true to steal motion events from the children and have 2075 * them dispatched to this ViewGroup through onTouchEvent(). 2076 * The current target will receive an ACTION_CANCEL event, and no further 2077 * messages will be delivered here. 2078 */ 2079 public boolean onInterceptTouchEvent(MotionEvent ev) { 2080 return false; 2081 } 2082 2083 /** 2084 * {@inheritDoc} 2085 * 2086 * Looks for a view to give focus to respecting the setting specified by 2087 * {@link #getDescendantFocusability()}. 2088 * 2089 * Uses {@link #onRequestFocusInDescendants(int, android.graphics.Rect)} to 2090 * find focus within the children of this group when appropriate. 2091 * 2092 * @see #FOCUS_BEFORE_DESCENDANTS 2093 * @see #FOCUS_AFTER_DESCENDANTS 2094 * @see #FOCUS_BLOCK_DESCENDANTS 2095 * @see #onRequestFocusInDescendants(int, android.graphics.Rect) 2096 */ 2097 @Override 2098 public boolean requestFocus(int direction, Rect previouslyFocusedRect) { 2099 if (DBG) { 2100 System.out.println(this + " ViewGroup.requestFocus direction=" 2101 + direction); 2102 } 2103 int descendantFocusability = getDescendantFocusability(); 2104 2105 switch (descendantFocusability) { 2106 case FOCUS_BLOCK_DESCENDANTS: 2107 return super.requestFocus(direction, previouslyFocusedRect); 2108 case FOCUS_BEFORE_DESCENDANTS: { 2109 final boolean took = super.requestFocus(direction, previouslyFocusedRect); 2110 return took ? took : onRequestFocusInDescendants(direction, previouslyFocusedRect); 2111 } 2112 case FOCUS_AFTER_DESCENDANTS: { 2113 final boolean took = onRequestFocusInDescendants(direction, previouslyFocusedRect); 2114 return took ? took : super.requestFocus(direction, previouslyFocusedRect); 2115 } 2116 default: 2117 throw new IllegalStateException("descendant focusability must be " 2118 + "one of FOCUS_BEFORE_DESCENDANTS, FOCUS_AFTER_DESCENDANTS, FOCUS_BLOCK_DESCENDANTS " 2119 + "but is " + descendantFocusability); 2120 } 2121 } 2122 2123 /** 2124 * Look for a descendant to call {@link View#requestFocus} on. 2125 * Called by {@link ViewGroup#requestFocus(int, android.graphics.Rect)} 2126 * when it wants to request focus within its children. Override this to 2127 * customize how your {@link ViewGroup} requests focus within its children. 2128 * @param direction One of FOCUS_UP, FOCUS_DOWN, FOCUS_LEFT, and FOCUS_RIGHT 2129 * @param previouslyFocusedRect The rectangle (in this View's coordinate system) 2130 * to give a finer grained hint about where focus is coming from. May be null 2131 * if there is no hint. 2132 * @return Whether focus was taken. 2133 */ 2134 @SuppressWarnings({"ConstantConditions"}) 2135 protected boolean onRequestFocusInDescendants(int direction, 2136 Rect previouslyFocusedRect) { 2137 int index; 2138 int increment; 2139 int end; 2140 int count = mChildrenCount; 2141 if ((direction & FOCUS_FORWARD) != 0) { 2142 index = 0; 2143 increment = 1; 2144 end = count; 2145 } else { 2146 index = count - 1; 2147 increment = -1; 2148 end = -1; 2149 } 2150 final View[] children = mChildren; 2151 for (int i = index; i != end; i += increment) { 2152 View child = children[i]; 2153 if ((child.mViewFlags & VISIBILITY_MASK) == VISIBLE) { 2154 if (child.requestFocus(direction, previouslyFocusedRect)) { 2155 return true; 2156 } 2157 } 2158 } 2159 return false; 2160 } 2161 2162 /** 2163 * {@inheritDoc} 2164 * 2165 * @hide 2166 */ 2167 @Override 2168 public void dispatchStartTemporaryDetach() { 2169 super.dispatchStartTemporaryDetach(); 2170 final int count = mChildrenCount; 2171 final View[] children = mChildren; 2172 for (int i = 0; i < count; i++) { 2173 children[i].dispatchStartTemporaryDetach(); 2174 } 2175 } 2176 2177 /** 2178 * {@inheritDoc} 2179 * 2180 * @hide 2181 */ 2182 @Override 2183 public void dispatchFinishTemporaryDetach() { 2184 super.dispatchFinishTemporaryDetach(); 2185 final int count = mChildrenCount; 2186 final View[] children = mChildren; 2187 for (int i = 0; i < count; i++) { 2188 children[i].dispatchFinishTemporaryDetach(); 2189 } 2190 } 2191 2192 /** 2193 * {@inheritDoc} 2194 */ 2195 @Override 2196 void dispatchAttachedToWindow(AttachInfo info, int visibility) { 2197 mGroupFlags |= FLAG_PREVENT_DISPATCH_ATTACHED_TO_WINDOW; 2198 super.dispatchAttachedToWindow(info, visibility); 2199 mGroupFlags &= ~FLAG_PREVENT_DISPATCH_ATTACHED_TO_WINDOW; 2200 2201 visibility |= mViewFlags & VISIBILITY_MASK; 2202 2203 final int count = mChildrenCount; 2204 final View[] children = mChildren; 2205 for (int i = 0; i < count; i++) { 2206 children[i].dispatchAttachedToWindow(info, visibility); 2207 } 2208 } 2209 2210 @Override 2211 boolean dispatchPopulateAccessibilityEventInternal(AccessibilityEvent event) { 2212 boolean handled = super.dispatchPopulateAccessibilityEventInternal(event); 2213 if (handled) { 2214 return handled; 2215 } 2216 // Let our children have a shot in populating the event. 2217 for (int i = 0, count = getChildCount(); i < count; i++) { 2218 View child = getChildAt(i); 2219 if ((child.mViewFlags & VISIBILITY_MASK) == VISIBLE) { 2220 handled = getChildAt(i).dispatchPopulateAccessibilityEvent(event); 2221 if (handled) { 2222 return handled; 2223 } 2224 } 2225 } 2226 return false; 2227 } 2228 2229 @Override 2230 void onInitializeAccessibilityNodeInfoInternal(AccessibilityNodeInfo info) { 2231 super.onInitializeAccessibilityNodeInfoInternal(info); 2232 info.setClassName(ViewGroup.class.getName()); 2233 for (int i = 0, count = mChildrenCount; i < count; i++) { 2234 View child = mChildren[i]; 2235 if ((child.mViewFlags & VISIBILITY_MASK) == VISIBLE 2236 && (child.mPrivateFlags & IS_ROOT_NAMESPACE) == 0) { 2237 info.addChild(child); 2238 } 2239 } 2240 } 2241 2242 @Override 2243 void onInitializeAccessibilityEventInternal(AccessibilityEvent event) { 2244 super.onInitializeAccessibilityEventInternal(event); 2245 event.setClassName(ViewGroup.class.getName()); 2246 } 2247 2248 /** 2249 * {@inheritDoc} 2250 */ 2251 @Override 2252 void dispatchDetachedFromWindow() { 2253 // If we still have a touch target, we are still in the process of 2254 // dispatching motion events to a child; we need to get rid of that 2255 // child to avoid dispatching events to it after the window is torn 2256 // down. To make sure we keep the child in a consistent state, we 2257 // first send it an ACTION_CANCEL motion event. 2258 cancelAndClearTouchTargets(null); 2259 2260 // In case view is detached while transition is running 2261 mLayoutSuppressed = false; 2262 2263 // Tear down our drag tracking 2264 mDragNotifiedChildren = null; 2265 if (mCurrentDrag != null) { 2266 mCurrentDrag.recycle(); 2267 mCurrentDrag = null; 2268 } 2269 2270 final int count = mChildrenCount; 2271 final View[] children = mChildren; 2272 for (int i = 0; i < count; i++) { 2273 children[i].dispatchDetachedFromWindow(); 2274 } 2275 super.dispatchDetachedFromWindow(); 2276 } 2277 2278 /** 2279 * {@inheritDoc} 2280 */ 2281 @Override 2282 public void setPadding(int left, int top, int right, int bottom) { 2283 super.setPadding(left, top, right, bottom); 2284 2285 if ((mPaddingLeft | mPaddingTop | mPaddingRight | mPaddingBottom) != 0) { 2286 mGroupFlags |= FLAG_PADDING_NOT_NULL; 2287 } else { 2288 mGroupFlags &= ~FLAG_PADDING_NOT_NULL; 2289 } 2290 } 2291 2292 /** 2293 * {@inheritDoc} 2294 */ 2295 @Override 2296 protected void dispatchSaveInstanceState(SparseArray<Parcelable> container) { 2297 super.dispatchSaveInstanceState(container); 2298 final int count = mChildrenCount; 2299 final View[] children = mChildren; 2300 for (int i = 0; i < count; i++) { 2301 View c = children[i]; 2302 if ((c.mViewFlags & PARENT_SAVE_DISABLED_MASK) != PARENT_SAVE_DISABLED) { 2303 c.dispatchSaveInstanceState(container); 2304 } 2305 } 2306 } 2307 2308 /** 2309 * Perform dispatching of a {@link #saveHierarchyState(android.util.SparseArray)} freeze()} 2310 * to only this view, not to its children. For use when overriding 2311 * {@link #dispatchSaveInstanceState(android.util.SparseArray)} dispatchFreeze()} to allow 2312 * subclasses to freeze their own state but not the state of their children. 2313 * 2314 * @param container the container 2315 */ 2316 protected void dispatchFreezeSelfOnly(SparseArray<Parcelable> container) { 2317 super.dispatchSaveInstanceState(container); 2318 } 2319 2320 /** 2321 * {@inheritDoc} 2322 */ 2323 @Override 2324 protected void dispatchRestoreInstanceState(SparseArray<Parcelable> container) { 2325 super.dispatchRestoreInstanceState(container); 2326 final int count = mChildrenCount; 2327 final View[] children = mChildren; 2328 for (int i = 0; i < count; i++) { 2329 View c = children[i]; 2330 if ((c.mViewFlags & PARENT_SAVE_DISABLED_MASK) != PARENT_SAVE_DISABLED) { 2331 c.dispatchRestoreInstanceState(container); 2332 } 2333 } 2334 } 2335 2336 /** 2337 * Perform dispatching of a {@link #restoreHierarchyState(android.util.SparseArray)} 2338 * to only this view, not to its children. For use when overriding 2339 * {@link #dispatchRestoreInstanceState(android.util.SparseArray)} to allow 2340 * subclasses to thaw their own state but not the state of their children. 2341 * 2342 * @param container the container 2343 */ 2344 protected void dispatchThawSelfOnly(SparseArray<Parcelable> container) { 2345 super.dispatchRestoreInstanceState(container); 2346 } 2347 2348 /** 2349 * Enables or disables the drawing cache for each child of this view group. 2350 * 2351 * @param enabled true to enable the cache, false to dispose of it 2352 */ 2353 protected void setChildrenDrawingCacheEnabled(boolean enabled) { 2354 if (enabled || (mPersistentDrawingCache & PERSISTENT_ALL_CACHES) != PERSISTENT_ALL_CACHES) { 2355 final View[] children = mChildren; 2356 final int count = mChildrenCount; 2357 for (int i = 0; i < count; i++) { 2358 children[i].setDrawingCacheEnabled(enabled); 2359 } 2360 } 2361 } 2362 2363 @Override 2364 protected void onAnimationStart() { 2365 super.onAnimationStart(); 2366 2367 // When this ViewGroup's animation starts, build the cache for the children 2368 if ((mGroupFlags & FLAG_ANIMATION_CACHE) == FLAG_ANIMATION_CACHE) { 2369 final int count = mChildrenCount; 2370 final View[] children = mChildren; 2371 final boolean buildCache = !isHardwareAccelerated(); 2372 2373 for (int i = 0; i < count; i++) { 2374 final View child = children[i]; 2375 if ((child.mViewFlags & VISIBILITY_MASK) == VISIBLE) { 2376 child.setDrawingCacheEnabled(true); 2377 if (buildCache) { 2378 child.buildDrawingCache(true); 2379 } 2380 } 2381 } 2382 2383 mGroupFlags |= FLAG_CHILDREN_DRAWN_WITH_CACHE; 2384 } 2385 } 2386 2387 @Override 2388 protected void onAnimationEnd() { 2389 super.onAnimationEnd(); 2390 2391 // When this ViewGroup's animation ends, destroy the cache of the children 2392 if ((mGroupFlags & FLAG_ANIMATION_CACHE) == FLAG_ANIMATION_CACHE) { 2393 mGroupFlags &= ~FLAG_CHILDREN_DRAWN_WITH_CACHE; 2394 2395 if ((mPersistentDrawingCache & PERSISTENT_ANIMATION_CACHE) == 0) { 2396 setChildrenDrawingCacheEnabled(false); 2397 } 2398 } 2399 } 2400 2401 @Override 2402 Bitmap createSnapshot(Bitmap.Config quality, int backgroundColor, boolean skipChildren) { 2403 int count = mChildrenCount; 2404 int[] visibilities = null; 2405 2406 if (skipChildren) { 2407 visibilities = new int[count]; 2408 for (int i = 0; i < count; i++) { 2409 View child = getChildAt(i); 2410 visibilities[i] = child.getVisibility(); 2411 if (visibilities[i] == View.VISIBLE) { 2412 child.setVisibility(INVISIBLE); 2413 } 2414 } 2415 } 2416 2417 Bitmap b = super.createSnapshot(quality, backgroundColor, skipChildren); 2418 2419 if (skipChildren) { 2420 for (int i = 0; i < count; i++) { 2421 getChildAt(i).setVisibility(visibilities[i]); 2422 } 2423 } 2424 2425 return b; 2426 } 2427 2428 /** 2429 * {@inheritDoc} 2430 */ 2431 @Override 2432 protected void dispatchDraw(Canvas canvas) { 2433 final int count = mChildrenCount; 2434 final View[] children = mChildren; 2435 int flags = mGroupFlags; 2436 2437 if ((flags & FLAG_RUN_ANIMATION) != 0 && canAnimate()) { 2438 final boolean cache = (mGroupFlags & FLAG_ANIMATION_CACHE) == FLAG_ANIMATION_CACHE; 2439 2440 final boolean buildCache = !isHardwareAccelerated(); 2441 for (int i = 0; i < count; i++) { 2442 final View child = children[i]; 2443 if ((child.mViewFlags & VISIBILITY_MASK) == VISIBLE) { 2444 final LayoutParams params = child.getLayoutParams(); 2445 attachLayoutAnimationParameters(child, params, i, count); 2446 bindLayoutAnimation(child); 2447 if (cache) { 2448 child.setDrawingCacheEnabled(true); 2449 if (buildCache) { 2450 child.buildDrawingCache(true); 2451 } 2452 } 2453 } 2454 } 2455 2456 final LayoutAnimationController controller = mLayoutAnimationController; 2457 if (controller.willOverlap()) { 2458 mGroupFlags |= FLAG_OPTIMIZE_INVALIDATE; 2459 } 2460 2461 controller.start(); 2462 2463 mGroupFlags &= ~FLAG_RUN_ANIMATION; 2464 mGroupFlags &= ~FLAG_ANIMATION_DONE; 2465 2466 if (cache) { 2467 mGroupFlags |= FLAG_CHILDREN_DRAWN_WITH_CACHE; 2468 } 2469 2470 if (mAnimationListener != null) { 2471 mAnimationListener.onAnimationStart(controller.getAnimation()); 2472 } 2473 } 2474 2475 int saveCount = 0; 2476 final boolean clipToPadding = (flags & CLIP_TO_PADDING_MASK) == CLIP_TO_PADDING_MASK; 2477 if (clipToPadding) { 2478 saveCount = canvas.save(); 2479 canvas.clipRect(mScrollX + mPaddingLeft, mScrollY + mPaddingTop, 2480 mScrollX + mRight - mLeft - mPaddingRight, 2481 mScrollY + mBottom - mTop - mPaddingBottom); 2482 2483 } 2484 2485 // We will draw our child's animation, let's reset the flag 2486 mPrivateFlags &= ~DRAW_ANIMATION; 2487 mGroupFlags &= ~FLAG_INVALIDATE_REQUIRED; 2488 2489 boolean more = false; 2490 final long drawingTime = getDrawingTime(); 2491 2492 if ((flags & FLAG_USE_CHILD_DRAWING_ORDER) == 0) { 2493 for (int i = 0; i < count; i++) { 2494 final View child = children[i]; 2495 if ((child.mViewFlags & VISIBILITY_MASK) == VISIBLE || child.getAnimation() != null) { 2496 more |= drawChild(canvas, child, drawingTime); 2497 } 2498 } 2499 } else { 2500 for (int i = 0; i < count; i++) { 2501 final View child = children[getChildDrawingOrder(count, i)]; 2502 if ((child.mViewFlags & VISIBILITY_MASK) == VISIBLE || child.getAnimation() != null) { 2503 more |= drawChild(canvas, child, drawingTime); 2504 } 2505 } 2506 } 2507 2508 // Draw any disappearing views that have animations 2509 if (mDisappearingChildren != null) { 2510 final ArrayList<View> disappearingChildren = mDisappearingChildren; 2511 final int disappearingCount = disappearingChildren.size() - 1; 2512 // Go backwards -- we may delete as animations finish 2513 for (int i = disappearingCount; i >= 0; i--) { 2514 final View child = disappearingChildren.get(i); 2515 more |= drawChild(canvas, child, drawingTime); 2516 } 2517 } 2518 2519 if (clipToPadding) { 2520 canvas.restoreToCount(saveCount); 2521 } 2522 2523 // mGroupFlags might have been updated by drawChild() 2524 flags = mGroupFlags; 2525 2526 if ((flags & FLAG_INVALIDATE_REQUIRED) == FLAG_INVALIDATE_REQUIRED) { 2527 invalidate(true); 2528 } 2529 2530 if ((flags & FLAG_ANIMATION_DONE) == 0 && (flags & FLAG_NOTIFY_ANIMATION_LISTENER) == 0 && 2531 mLayoutAnimationController.isDone() && !more) { 2532 // We want to erase the drawing cache and notify the listener after the 2533 // next frame is drawn because one extra invalidate() is caused by 2534 // drawChild() after the animation is over 2535 mGroupFlags |= FLAG_NOTIFY_ANIMATION_LISTENER; 2536 final Runnable end = new Runnable() { 2537 public void run() { 2538 notifyAnimationListener(); 2539 } 2540 }; 2541 post(end); 2542 } 2543 } 2544 2545 /** 2546 * Returns the index of the child to draw for this iteration. Override this 2547 * if you want to change the drawing order of children. By default, it 2548 * returns i. 2549 * <p> 2550 * NOTE: In order for this method to be called, you must enable child ordering 2551 * first by calling {@link #setChildrenDrawingOrderEnabled(boolean)}. 2552 * 2553 * @param i The current iteration. 2554 * @return The index of the child to draw this iteration. 2555 * 2556 * @see #setChildrenDrawingOrderEnabled(boolean) 2557 * @see #isChildrenDrawingOrderEnabled() 2558 */ 2559 protected int getChildDrawingOrder(int childCount, int i) { 2560 return i; 2561 } 2562 2563 private void notifyAnimationListener() { 2564 mGroupFlags &= ~FLAG_NOTIFY_ANIMATION_LISTENER; 2565 mGroupFlags |= FLAG_ANIMATION_DONE; 2566 2567 if (mAnimationListener != null) { 2568 final Runnable end = new Runnable() { 2569 public void run() { 2570 mAnimationListener.onAnimationEnd(mLayoutAnimationController.getAnimation()); 2571 } 2572 }; 2573 post(end); 2574 } 2575 2576 if ((mGroupFlags & FLAG_ANIMATION_CACHE) == FLAG_ANIMATION_CACHE) { 2577 mGroupFlags &= ~FLAG_CHILDREN_DRAWN_WITH_CACHE; 2578 if ((mPersistentDrawingCache & PERSISTENT_ANIMATION_CACHE) == 0) { 2579 setChildrenDrawingCacheEnabled(false); 2580 } 2581 } 2582 2583 invalidate(true); 2584 } 2585 2586 /** 2587 * This method is used to cause children of this ViewGroup to restore or recreate their 2588 * display lists. It is called by getDisplayList() when the parent ViewGroup does not need 2589 * to recreate its own display list, which would happen if it went through the normal 2590 * draw/dispatchDraw mechanisms. 2591 * 2592 * @hide 2593 */ 2594 @Override 2595 protected void dispatchGetDisplayList() { 2596 final int count = mChildrenCount; 2597 final View[] children = mChildren; 2598 for (int i = 0; i < count; i++) { 2599 final View child = children[i]; 2600 if (((child.mViewFlags & VISIBILITY_MASK) == VISIBLE || child.getAnimation() != null) && 2601 child.hasStaticLayer()) { 2602 child.mRecreateDisplayList = (child.mPrivateFlags & INVALIDATED) == INVALIDATED; 2603 child.mPrivateFlags &= ~INVALIDATED; 2604 child.getDisplayList(); 2605 child.mRecreateDisplayList = false; 2606 } 2607 } 2608 } 2609 2610 /** 2611 * Draw one child of this View Group. This method is responsible for getting 2612 * the canvas in the right state. This includes clipping, translating so 2613 * that the child's scrolled origin is at 0, 0, and applying any animation 2614 * transformations. 2615 * 2616 * @param canvas The canvas on which to draw the child 2617 * @param child Who to draw 2618 * @param drawingTime The time at which draw is occuring 2619 * @return True if an invalidate() was issued 2620 */ 2621 protected boolean drawChild(Canvas canvas, View child, long drawingTime) { 2622 boolean more = false; 2623 2624 final int cl = child.mLeft; 2625 final int ct = child.mTop; 2626 final int cr = child.mRight; 2627 final int cb = child.mBottom; 2628 2629 final boolean childHasIdentityMatrix = child.hasIdentityMatrix(); 2630 2631 final int flags = mGroupFlags; 2632 2633 if ((flags & FLAG_CLEAR_TRANSFORMATION) == FLAG_CLEAR_TRANSFORMATION) { 2634 mChildTransformation.clear(); 2635 mGroupFlags &= ~FLAG_CLEAR_TRANSFORMATION; 2636 } 2637 2638 Transformation transformToApply = null; 2639 Transformation invalidationTransform; 2640 final Animation a = child.getAnimation(); 2641 boolean concatMatrix = false; 2642 2643 boolean scalingRequired = false; 2644 boolean caching; 2645 int layerType = mDrawLayers ? child.getLayerType() : LAYER_TYPE_NONE; 2646 2647 final boolean hardwareAccelerated = canvas.isHardwareAccelerated(); 2648 if ((flags & FLAG_CHILDREN_DRAWN_WITH_CACHE) == FLAG_CHILDREN_DRAWN_WITH_CACHE || 2649 (flags & FLAG_ALWAYS_DRAWN_WITH_CACHE) == FLAG_ALWAYS_DRAWN_WITH_CACHE) { 2650 caching = true; 2651 if (mAttachInfo != null) scalingRequired = mAttachInfo.mScalingRequired; 2652 } else { 2653 caching = (layerType != LAYER_TYPE_NONE) || hardwareAccelerated; 2654 } 2655 2656 if (a != null) { 2657 final boolean initialized = a.isInitialized(); 2658 if (!initialized) { 2659 a.initialize(cr - cl, cb - ct, getWidth(), getHeight()); 2660 a.initializeInvalidateRegion(0, 0, cr - cl, cb - ct); 2661 child.onAnimationStart(); 2662 } 2663 2664 more = a.getTransformation(drawingTime, mChildTransformation, 2665 scalingRequired ? mAttachInfo.mApplicationScale : 1f); 2666 if (scalingRequired && mAttachInfo.mApplicationScale != 1f) { 2667 if (mInvalidationTransformation == null) { 2668 mInvalidationTransformation = new Transformation(); 2669 } 2670 invalidationTransform = mInvalidationTransformation; 2671 a.getTransformation(drawingTime, invalidationTransform, 1f); 2672 } else { 2673 invalidationTransform = mChildTransformation; 2674 } 2675 transformToApply = mChildTransformation; 2676 2677 concatMatrix = a.willChangeTransformationMatrix(); 2678 2679 if (more) { 2680 if (!a.willChangeBounds()) { 2681 if ((flags & (FLAG_OPTIMIZE_INVALIDATE | FLAG_ANIMATION_DONE)) == 2682 FLAG_OPTIMIZE_INVALIDATE) { 2683 mGroupFlags |= FLAG_INVALIDATE_REQUIRED; 2684 } else if ((flags & FLAG_INVALIDATE_REQUIRED) == 0) { 2685 // The child need to draw an animation, potentially offscreen, so 2686 // make sure we do not cancel invalidate requests 2687 mPrivateFlags |= DRAW_ANIMATION; 2688 invalidate(cl, ct, cr, cb); 2689 } 2690 } else { 2691 if (mInvalidateRegion == null) { 2692 mInvalidateRegion = new RectF(); 2693 } 2694 final RectF region = mInvalidateRegion; 2695 a.getInvalidateRegion(0, 0, cr - cl, cb - ct, region, invalidationTransform); 2696 2697 // The child need to draw an animation, potentially offscreen, so 2698 // make sure we do not cancel invalidate requests 2699 mPrivateFlags |= DRAW_ANIMATION; 2700 2701 final int left = cl + (int) region.left; 2702 final int top = ct + (int) region.top; 2703 invalidate(left, top, left + (int) (region.width() + .5f), 2704 top + (int) (region.height() + .5f)); 2705 } 2706 } 2707 } else if ((flags & FLAG_SUPPORT_STATIC_TRANSFORMATIONS) == 2708 FLAG_SUPPORT_STATIC_TRANSFORMATIONS) { 2709 final boolean hasTransform = getChildStaticTransformation(child, mChildTransformation); 2710 if (hasTransform) { 2711 final int transformType = mChildTransformation.getTransformationType(); 2712 transformToApply = transformType != Transformation.TYPE_IDENTITY ? 2713 mChildTransformation : null; 2714 concatMatrix = (transformType & Transformation.TYPE_MATRIX) != 0; 2715 } 2716 } 2717 2718 concatMatrix |= !childHasIdentityMatrix; 2719 2720 // Sets the flag as early as possible to allow draw() implementations 2721 // to call invalidate() successfully when doing animations 2722 child.mPrivateFlags |= DRAWN; 2723 2724 if (!concatMatrix && canvas.quickReject(cl, ct, cr, cb, Canvas.EdgeType.BW) && 2725 (child.mPrivateFlags & DRAW_ANIMATION) == 0) { 2726 return more; 2727 } 2728 2729 if (hardwareAccelerated) { 2730 // Clear INVALIDATED flag to allow invalidation to occur during rendering, but 2731 // retain the flag's value temporarily in the mRecreateDisplayList flag 2732 child.mRecreateDisplayList = (child.mPrivateFlags & INVALIDATED) == INVALIDATED; 2733 child.mPrivateFlags &= ~INVALIDATED; 2734 } 2735 2736 child.computeScroll(); 2737 2738 final int sx = child.mScrollX; 2739 final int sy = child.mScrollY; 2740 2741 DisplayList displayList = null; 2742 Bitmap cache = null; 2743 boolean hasDisplayList = false; 2744 if (caching) { 2745 if (!hardwareAccelerated) { 2746 if (layerType != LAYER_TYPE_NONE) { 2747 layerType = LAYER_TYPE_SOFTWARE; 2748 child.buildDrawingCache(true); 2749 } 2750 cache = child.getDrawingCache(true); 2751 } else { 2752 switch (layerType) { 2753 case LAYER_TYPE_SOFTWARE: 2754 child.buildDrawingCache(true); 2755 cache = child.getDrawingCache(true); 2756 break; 2757 case LAYER_TYPE_NONE: 2758 // Delay getting the display list until animation-driven alpha values are 2759 // set up and possibly passed on to the view 2760 hasDisplayList = child.canHaveDisplayList(); 2761 break; 2762 } 2763 } 2764 } 2765 2766 final boolean hasNoCache = cache == null || hasDisplayList; 2767 final boolean offsetForScroll = cache == null && !hasDisplayList && 2768 layerType != LAYER_TYPE_HARDWARE; 2769 2770 final int restoreTo = canvas.save(); 2771 if (offsetForScroll) { 2772 canvas.translate(cl - sx, ct - sy); 2773 } else { 2774 canvas.translate(cl, ct); 2775 if (scalingRequired) { 2776 // mAttachInfo cannot be null, otherwise scalingRequired == false 2777 final float scale = 1.0f / mAttachInfo.mApplicationScale; 2778 canvas.scale(scale, scale); 2779 } 2780 } 2781 2782 float alpha = child.getAlpha(); 2783 if (transformToApply != null || alpha < 1.0f || !child.hasIdentityMatrix()) { 2784 if (transformToApply != null || !childHasIdentityMatrix) { 2785 int transX = 0; 2786 int transY = 0; 2787 2788 if (offsetForScroll) { 2789 transX = -sx; 2790 transY = -sy; 2791 } 2792 2793 if (transformToApply != null) { 2794 if (concatMatrix) { 2795 // Undo the scroll translation, apply the transformation matrix, 2796 // then redo the scroll translate to get the correct result. 2797 canvas.translate(-transX, -transY); 2798 canvas.concat(transformToApply.getMatrix()); 2799 canvas.translate(transX, transY); 2800 mGroupFlags |= FLAG_CLEAR_TRANSFORMATION; 2801 } 2802 2803 float transformAlpha = transformToApply.getAlpha(); 2804 if (transformAlpha < 1.0f) { 2805 alpha *= transformToApply.getAlpha(); 2806 mGroupFlags |= FLAG_CLEAR_TRANSFORMATION; 2807 } 2808 } 2809 2810 if (!childHasIdentityMatrix) { 2811 canvas.translate(-transX, -transY); 2812 canvas.concat(child.getMatrix()); 2813 canvas.translate(transX, transY); 2814 } 2815 } 2816 2817 if (alpha < 1.0f) { 2818 mGroupFlags |= FLAG_CLEAR_TRANSFORMATION; 2819 if (hasNoCache) { 2820 final int multipliedAlpha = (int) (255 * alpha); 2821 if (!child.onSetAlpha(multipliedAlpha)) { 2822 int layerFlags = Canvas.HAS_ALPHA_LAYER_SAVE_FLAG; 2823 if ((flags & FLAG_CLIP_CHILDREN) == FLAG_CLIP_CHILDREN || 2824 layerType != LAYER_TYPE_NONE) { 2825 layerFlags |= Canvas.CLIP_TO_LAYER_SAVE_FLAG; 2826 } 2827 if (layerType == LAYER_TYPE_NONE) { 2828 final int scrollX = hasDisplayList ? 0 : sx; 2829 final int scrollY = hasDisplayList ? 0 : sy; 2830 canvas.saveLayerAlpha(scrollX, scrollY, scrollX + cr - cl, 2831 scrollY + cb - ct, multipliedAlpha, layerFlags); 2832 } 2833 } else { 2834 // Alpha is handled by the child directly, clobber the layer's alpha 2835 child.mPrivateFlags |= ALPHA_SET; 2836 } 2837 } 2838 } 2839 } else if ((child.mPrivateFlags & ALPHA_SET) == ALPHA_SET) { 2840 child.onSetAlpha(255); 2841 child.mPrivateFlags &= ~ALPHA_SET; 2842 } 2843 2844 if ((flags & FLAG_CLIP_CHILDREN) == FLAG_CLIP_CHILDREN) { 2845 if (offsetForScroll) { 2846 canvas.clipRect(sx, sy, sx + (cr - cl), sy + (cb - ct)); 2847 } else { 2848 if (!scalingRequired || cache == null) { 2849 canvas.clipRect(0, 0, cr - cl, cb - ct); 2850 } else { 2851 canvas.clipRect(0, 0, cache.getWidth(), cache.getHeight()); 2852 } 2853 } 2854 } 2855 2856 if (hasDisplayList) { 2857 displayList = child.getDisplayList(); 2858 if (!displayList.isValid()) { 2859 // Uncommon, but possible. If a view is removed from the hierarchy during the call 2860 // to getDisplayList(), the display list will be marked invalid and we should not 2861 // try to use it again. 2862 displayList = null; 2863 hasDisplayList = false; 2864 } 2865 } 2866 2867 if (hasNoCache) { 2868 boolean layerRendered = false; 2869 if (layerType == LAYER_TYPE_HARDWARE) { 2870 final HardwareLayer layer = child.getHardwareLayer(); 2871 if (layer != null && layer.isValid()) { 2872 child.mLayerPaint.setAlpha((int) (alpha * 255)); 2873 ((HardwareCanvas) canvas).drawHardwareLayer(layer, 0, 0, child.mLayerPaint); 2874 layerRendered = true; 2875 } else { 2876 final int scrollX = hasDisplayList ? 0 : sx; 2877 final int scrollY = hasDisplayList ? 0 : sy; 2878 canvas.saveLayer(scrollX, scrollY, 2879 scrollX + cr - cl, scrollY + cb - ct, child.mLayerPaint, 2880 Canvas.HAS_ALPHA_LAYER_SAVE_FLAG | Canvas.CLIP_TO_LAYER_SAVE_FLAG); 2881 } 2882 } 2883 2884 if (!layerRendered) { 2885 if (!hasDisplayList) { 2886 // Fast path for layouts with no backgrounds 2887 if ((child.mPrivateFlags & SKIP_DRAW) == SKIP_DRAW) { 2888 if (ViewDebug.TRACE_HIERARCHY) { 2889 ViewDebug.trace(this, ViewDebug.HierarchyTraceType.DRAW); 2890 } 2891 child.mPrivateFlags &= ~DIRTY_MASK; 2892 child.dispatchDraw(canvas); 2893 } else { 2894 child.draw(canvas); 2895 } 2896 } else { 2897 child.mPrivateFlags &= ~DIRTY_MASK; 2898 ((HardwareCanvas) canvas).drawDisplayList(displayList, cr - cl, cb - ct, null); 2899 } 2900 } 2901 } else if (cache != null) { 2902 child.mPrivateFlags &= ~DIRTY_MASK; 2903 Paint cachePaint; 2904 2905 if (layerType == LAYER_TYPE_NONE) { 2906 cachePaint = mCachePaint; 2907 if (cachePaint == null) { 2908 cachePaint = new Paint(); 2909 cachePaint.setDither(false); 2910 mCachePaint = cachePaint; 2911 } 2912 if (alpha < 1.0f) { 2913 cachePaint.setAlpha((int) (alpha * 255)); 2914 mGroupFlags |= FLAG_ALPHA_LOWER_THAN_ONE; 2915 } else if ((flags & FLAG_ALPHA_LOWER_THAN_ONE) == FLAG_ALPHA_LOWER_THAN_ONE) { 2916 cachePaint.setAlpha(255); 2917 mGroupFlags &= ~FLAG_ALPHA_LOWER_THAN_ONE; 2918 } 2919 } else { 2920 cachePaint = child.mLayerPaint; 2921 cachePaint.setAlpha((int) (alpha * 255)); 2922 } 2923 canvas.drawBitmap(cache, 0.0f, 0.0f, cachePaint); 2924 } 2925 2926 canvas.restoreToCount(restoreTo); 2927 2928 if (a != null && !more) { 2929 if (!hardwareAccelerated && !a.getFillAfter()) { 2930 child.onSetAlpha(255); 2931 } 2932 finishAnimatingView(child, a); 2933 } 2934 2935 if (more && hardwareAccelerated) { 2936 // invalidation is the trigger to recreate display lists, so if we're using 2937 // display lists to render, force an invalidate to allow the animation to 2938 // continue drawing another frame 2939 invalidate(true); 2940 if (a.hasAlpha() && (child.mPrivateFlags & ALPHA_SET) == ALPHA_SET) { 2941 // alpha animations should cause the child to recreate its display list 2942 child.invalidate(true); 2943 } 2944 } 2945 2946 child.mRecreateDisplayList = false; 2947 2948 return more; 2949 } 2950 2951 /** 2952 * 2953 * @param enabled True if children should be drawn with layers, false otherwise. 2954 * 2955 * @hide 2956 */ 2957 public void setChildrenLayersEnabled(boolean enabled) { 2958 if (enabled != mDrawLayers) { 2959 mDrawLayers = enabled; 2960 invalidate(true); 2961 2962 boolean flushLayers = !enabled; 2963 AttachInfo info = mAttachInfo; 2964 if (info != null && info.mHardwareRenderer != null && 2965 info.mHardwareRenderer.isEnabled()) { 2966 if (!info.mHardwareRenderer.validate()) { 2967 flushLayers = false; 2968 } 2969 } else { 2970 flushLayers = false; 2971 } 2972 2973 // We need to invalidate any child with a layer. For instance, 2974 // if a child is backed by a hardware layer and we disable layers 2975 // the child is marked as not dirty (flags cleared the last time 2976 // the child was drawn inside its layer.) However, that child might 2977 // never have created its own display list or have an obsolete 2978 // display list. By invalidating the child we ensure the display 2979 // list is in sync with the content of the hardware layer. 2980 for (int i = 0; i < mChildrenCount; i++) { 2981 View child = mChildren[i]; 2982 if (child.mLayerType != LAYER_TYPE_NONE) { 2983 if (flushLayers) child.flushLayer(); 2984 child.invalidate(true); 2985 } 2986 } 2987 } 2988 } 2989 2990 /** 2991 * By default, children are clipped to their bounds before drawing. This 2992 * allows view groups to override this behavior for animations, etc. 2993 * 2994 * @param clipChildren true to clip children to their bounds, 2995 * false otherwise 2996 * @attr ref android.R.styleable#ViewGroup_clipChildren 2997 */ 2998 public void setClipChildren(boolean clipChildren) { 2999 setBooleanFlag(FLAG_CLIP_CHILDREN, clipChildren); 3000 } 3001 3002 /** 3003 * By default, children are clipped to the padding of the ViewGroup. This 3004 * allows view groups to override this behavior 3005 * 3006 * @param clipToPadding true to clip children to the padding of the 3007 * group, false otherwise 3008 * @attr ref android.R.styleable#ViewGroup_clipToPadding 3009 */ 3010 public void setClipToPadding(boolean clipToPadding) { 3011 setBooleanFlag(FLAG_CLIP_TO_PADDING, clipToPadding); 3012 } 3013 3014 /** 3015 * {@inheritDoc} 3016 */ 3017 @Override 3018 public void dispatchSetSelected(boolean selected) { 3019 final View[] children = mChildren; 3020 final int count = mChildrenCount; 3021 for (int i = 0; i < count; i++) { 3022 children[i].setSelected(selected); 3023 } 3024 } 3025 3026 /** 3027 * {@inheritDoc} 3028 */ 3029 @Override 3030 public void dispatchSetActivated(boolean activated) { 3031 final View[] children = mChildren; 3032 final int count = mChildrenCount; 3033 for (int i = 0; i < count; i++) { 3034 children[i].setActivated(activated); 3035 } 3036 } 3037 3038 @Override 3039 protected void dispatchSetPressed(boolean pressed) { 3040 final View[] children = mChildren; 3041 final int count = mChildrenCount; 3042 for (int i = 0; i < count; i++) { 3043 children[i].setPressed(pressed); 3044 } 3045 } 3046 3047 /** 3048 * When this property is set to true, this ViewGroup supports static transformations on 3049 * children; this causes 3050 * {@link #getChildStaticTransformation(View, android.view.animation.Transformation)} to be 3051 * invoked when a child is drawn. 3052 * 3053 * Any subclass overriding 3054 * {@link #getChildStaticTransformation(View, android.view.animation.Transformation)} should 3055 * set this property to true. 3056 * 3057 * @param enabled True to enable static transformations on children, false otherwise. 3058 * 3059 * @see #FLAG_SUPPORT_STATIC_TRANSFORMATIONS 3060 */ 3061 protected void setStaticTransformationsEnabled(boolean enabled) { 3062 setBooleanFlag(FLAG_SUPPORT_STATIC_TRANSFORMATIONS, enabled); 3063 } 3064 3065 /** 3066 * Sets <code>t</code> to be the static transformation of the child, if set, returning a 3067 * boolean to indicate whether a static transform was set. The default implementation 3068 * simply returns <code>false</code>; subclasses may override this method for different 3069 * behavior. 3070 * 3071 * @param child The child view whose static transform is being requested 3072 * @param t The Transformation which will hold the result 3073 * @return true if the transformation was set, false otherwise 3074 * @see #setStaticTransformationsEnabled(boolean) 3075 */ 3076 protected boolean getChildStaticTransformation(View child, Transformation t) { 3077 return false; 3078 } 3079 3080 /** 3081 * {@hide} 3082 */ 3083 @Override 3084 protected View findViewTraversal(int id) { 3085 if (id == mID) { 3086 return this; 3087 } 3088 3089 final View[] where = mChildren; 3090 final int len = mChildrenCount; 3091 3092 for (int i = 0; i < len; i++) { 3093 View v = where[i]; 3094 3095 if ((v.mPrivateFlags & IS_ROOT_NAMESPACE) == 0) { 3096 v = v.findViewById(id); 3097 3098 if (v != null) { 3099 return v; 3100 } 3101 } 3102 } 3103 3104 return null; 3105 } 3106 3107 /** 3108 * {@hide} 3109 */ 3110 @Override 3111 protected View findViewWithTagTraversal(Object tag) { 3112 if (tag != null && tag.equals(mTag)) { 3113 return this; 3114 } 3115 3116 final View[] where = mChildren; 3117 final int len = mChildrenCount; 3118 3119 for (int i = 0; i < len; i++) { 3120 View v = where[i]; 3121 3122 if ((v.mPrivateFlags & IS_ROOT_NAMESPACE) == 0) { 3123 v = v.findViewWithTag(tag); 3124 3125 if (v != null) { 3126 return v; 3127 } 3128 } 3129 } 3130 3131 return null; 3132 } 3133 3134 /** 3135 * {@hide} 3136 */ 3137 @Override 3138 protected View findViewByPredicateTraversal(Predicate<View> predicate, View childToSkip) { 3139 if (predicate.apply(this)) { 3140 return this; 3141 } 3142 3143 final View[] where = mChildren; 3144 final int len = mChildrenCount; 3145 3146 for (int i = 0; i < len; i++) { 3147 View v = where[i]; 3148 3149 if (v != childToSkip && (v.mPrivateFlags & IS_ROOT_NAMESPACE) == 0) { 3150 v = v.findViewByPredicate(predicate); 3151 3152 if (v != null) { 3153 return v; 3154 } 3155 } 3156 } 3157 3158 return null; 3159 } 3160 3161 /** 3162 * Adds a child view. If no layout parameters are already set on the child, the 3163 * default parameters for this ViewGroup are set on the child. 3164 * 3165 * @param child the child view to add 3166 * 3167 * @see #generateDefaultLayoutParams() 3168 */ 3169 public void addView(View child) { 3170 addView(child, -1); 3171 } 3172 3173 /** 3174 * Adds a child view. If no layout parameters are already set on the child, the 3175 * default parameters for this ViewGroup are set on the child. 3176 * 3177 * @param child the child view to add 3178 * @param index the position at which to add the child 3179 * 3180 * @see #generateDefaultLayoutParams() 3181 */ 3182 public void addView(View child, int index) { 3183 LayoutParams params = child.getLayoutParams(); 3184 if (params == null) { 3185 params = generateDefaultLayoutParams(); 3186 if (params == null) { 3187 throw new IllegalArgumentException("generateDefaultLayoutParams() cannot return null"); 3188 } 3189 } 3190 addView(child, index, params); 3191 } 3192 3193 /** 3194 * Adds a child view with this ViewGroup's default layout parameters and the 3195 * specified width and height. 3196 * 3197 * @param child the child view to add 3198 */ 3199 public void addView(View child, int width, int height) { 3200 final LayoutParams params = generateDefaultLayoutParams(); 3201 params.width = width; 3202 params.height = height; 3203 addView(child, -1, params); 3204 } 3205 3206 /** 3207 * Adds a child view with the specified layout parameters. 3208 * 3209 * @param child the child view to add 3210 * @param params the layout parameters to set on the child 3211 */ 3212 public void addView(View child, LayoutParams params) { 3213 addView(child, -1, params); 3214 } 3215 3216 /** 3217 * Adds a child view with the specified layout parameters. 3218 * 3219 * @param child the child view to add 3220 * @param index the position at which to add the child 3221 * @param params the layout parameters to set on the child 3222 */ 3223 public void addView(View child, int index, LayoutParams params) { 3224 if (DBG) { 3225 System.out.println(this + " addView"); 3226 } 3227 3228 // addViewInner() will call child.requestLayout() when setting the new LayoutParams 3229 // therefore, we call requestLayout() on ourselves before, so that the child's request 3230 // will be blocked at our level 3231 requestLayout(); 3232 invalidate(true); 3233 addViewInner(child, index, params, false); 3234 } 3235 3236 /** 3237 * {@inheritDoc} 3238 */ 3239 public void updateViewLayout(View view, ViewGroup.LayoutParams params) { 3240 if (!checkLayoutParams(params)) { 3241 throw new IllegalArgumentException("Invalid LayoutParams supplied to " + this); 3242 } 3243 if (view.mParent != this) { 3244 throw new IllegalArgumentException("Given view not a child of " + this); 3245 } 3246 view.setLayoutParams(params); 3247 } 3248 3249 /** 3250 * {@inheritDoc} 3251 */ 3252 protected boolean checkLayoutParams(ViewGroup.LayoutParams p) { 3253 return p != null; 3254 } 3255 3256 /** 3257 * Interface definition for a callback to be invoked when the hierarchy 3258 * within this view changed. The hierarchy changes whenever a child is added 3259 * to or removed from this view. 3260 */ 3261 public interface OnHierarchyChangeListener { 3262 /** 3263 * Called when a new child is added to a parent view. 3264 * 3265 * @param parent the view in which a child was added 3266 * @param child the new child view added in the hierarchy 3267 */ 3268 void onChildViewAdded(View parent, View child); 3269 3270 /** 3271 * Called when a child is removed from a parent view. 3272 * 3273 * @param parent the view from which the child was removed 3274 * @param child the child removed from the hierarchy 3275 */ 3276 void onChildViewRemoved(View parent, View child); 3277 } 3278 3279 /** 3280 * Register a callback to be invoked when a child is added to or removed 3281 * from this view. 3282 * 3283 * @param listener the callback to invoke on hierarchy change 3284 */ 3285 public void setOnHierarchyChangeListener(OnHierarchyChangeListener listener) { 3286 mOnHierarchyChangeListener = listener; 3287 } 3288 3289 /** 3290 * @hide 3291 */ 3292 protected void onViewAdded(View child) { 3293 if (mOnHierarchyChangeListener != null) { 3294 mOnHierarchyChangeListener.onChildViewAdded(this, child); 3295 } 3296 } 3297 3298 /** 3299 * @hide 3300 */ 3301 protected void onViewRemoved(View child) { 3302 if (mOnHierarchyChangeListener != null) { 3303 mOnHierarchyChangeListener.onChildViewRemoved(this, child); 3304 } 3305 } 3306 3307 /** 3308 * Adds a view during layout. This is useful if in your onLayout() method, 3309 * you need to add more views (as does the list view for example). 3310 * 3311 * If index is negative, it means put it at the end of the list. 3312 * 3313 * @param child the view to add to the group 3314 * @param index the index at which the child must be added 3315 * @param params the layout parameters to associate with the child 3316 * @return true if the child was added, false otherwise 3317 */ 3318 protected boolean addViewInLayout(View child, int index, LayoutParams params) { 3319 return addViewInLayout(child, index, params, false); 3320 } 3321 3322 /** 3323 * Adds a view during layout. This is useful if in your onLayout() method, 3324 * you need to add more views (as does the list view for example). 3325 * 3326 * If index is negative, it means put it at the end of the list. 3327 * 3328 * @param child the view to add to the group 3329 * @param index the index at which the child must be added 3330 * @param params the layout parameters to associate with the child 3331 * @param preventRequestLayout if true, calling this method will not trigger a 3332 * layout request on child 3333 * @return true if the child was added, false otherwise 3334 */ 3335 protected boolean addViewInLayout(View child, int index, LayoutParams params, 3336 boolean preventRequestLayout) { 3337 child.mParent = null; 3338 addViewInner(child, index, params, preventRequestLayout); 3339 child.mPrivateFlags = (child.mPrivateFlags & ~DIRTY_MASK) | DRAWN; 3340 return true; 3341 } 3342 3343 /** 3344 * Prevents the specified child to be laid out during the next layout pass. 3345 * 3346 * @param child the child on which to perform the cleanup 3347 */ 3348 protected void cleanupLayoutState(View child) { 3349 child.mPrivateFlags &= ~View.FORCE_LAYOUT; 3350 } 3351 3352 private void addViewInner(View child, int index, LayoutParams params, 3353 boolean preventRequestLayout) { 3354 3355 if (mTransition != null) { 3356 // Don't prevent other add transitions from completing, but cancel remove 3357 // transitions to let them complete the process before we add to the container 3358 mTransition.cancel(LayoutTransition.DISAPPEARING); 3359 } 3360 3361 if (child.getParent() != null) { 3362 throw new IllegalStateException("The specified child already has a parent. " + 3363 "You must call removeView() on the child's parent first."); 3364 } 3365 3366 if (mTransition != null) { 3367 mTransition.addChild(this, child); 3368 } 3369 3370 if (!checkLayoutParams(params)) { 3371 params = generateLayoutParams(params); 3372 } 3373 3374 if (preventRequestLayout) { 3375 child.mLayoutParams = params; 3376 } else { 3377 child.setLayoutParams(params); 3378 } 3379 3380 if (index < 0) { 3381 index = mChildrenCount; 3382 } 3383 3384 addInArray(child, index); 3385 3386 // tell our children 3387 if (preventRequestLayout) { 3388 child.assignParent(this); 3389 } else { 3390 child.mParent = this; 3391 } 3392 3393 if (child.hasFocus()) { 3394 requestChildFocus(child, child.findFocus()); 3395 } 3396 3397 AttachInfo ai = mAttachInfo; 3398 if (ai != null && (mGroupFlags & FLAG_PREVENT_DISPATCH_ATTACHED_TO_WINDOW) == 0) { 3399 boolean lastKeepOn = ai.mKeepScreenOn; 3400 ai.mKeepScreenOn = false; 3401 child.dispatchAttachedToWindow(mAttachInfo, (mViewFlags&VISIBILITY_MASK)); 3402 if (ai.mKeepScreenOn) { 3403 needGlobalAttributesUpdate(true); 3404 } 3405 ai.mKeepScreenOn = lastKeepOn; 3406 } 3407 3408 onViewAdded(child); 3409 3410 if ((child.mViewFlags & DUPLICATE_PARENT_STATE) == DUPLICATE_PARENT_STATE) { 3411 mGroupFlags |= FLAG_NOTIFY_CHILDREN_ON_DRAWABLE_STATE_CHANGE; 3412 } 3413 } 3414 3415 private void addInArray(View child, int index) { 3416 View[] children = mChildren; 3417 final int count = mChildrenCount; 3418 final int size = children.length; 3419 if (index == count) { 3420 if (size == count) { 3421 mChildren = new View[size + ARRAY_CAPACITY_INCREMENT]; 3422 System.arraycopy(children, 0, mChildren, 0, size); 3423 children = mChildren; 3424 } 3425 children[mChildrenCount++] = child; 3426 } else if (index < count) { 3427 if (size == count) { 3428 mChildren = new View[size + ARRAY_CAPACITY_INCREMENT]; 3429 System.arraycopy(children, 0, mChildren, 0, index); 3430 System.arraycopy(children, index, mChildren, index + 1, count - index); 3431 children = mChildren; 3432 } else { 3433 System.arraycopy(children, index, children, index + 1, count - index); 3434 } 3435 children[index] = child; 3436 mChildrenCount++; 3437 if (mLastTouchDownIndex >= index) { 3438 mLastTouchDownIndex++; 3439 } 3440 } else { 3441 throw new IndexOutOfBoundsException("index=" + index + " count=" + count); 3442 } 3443 } 3444 3445 // This method also sets the child's mParent to null 3446 private void removeFromArray(int index) { 3447 final View[] children = mChildren; 3448 if (!(mTransitioningViews != null && mTransitioningViews.contains(children[index]))) { 3449 children[index].mParent = null; 3450 } 3451 final int count = mChildrenCount; 3452 if (index == count - 1) { 3453 children[--mChildrenCount] = null; 3454 } else if (index >= 0 && index < count) { 3455 System.arraycopy(children, index + 1, children, index, count - index - 1); 3456 children[--mChildrenCount] = null; 3457 } else { 3458 throw new IndexOutOfBoundsException(); 3459 } 3460 if (mLastTouchDownIndex == index) { 3461 mLastTouchDownTime = 0; 3462 mLastTouchDownIndex = -1; 3463 } else if (mLastTouchDownIndex > index) { 3464 mLastTouchDownIndex--; 3465 } 3466 } 3467 3468 // This method also sets the children's mParent to null 3469 private void removeFromArray(int start, int count) { 3470 final View[] children = mChildren; 3471 final int childrenCount = mChildrenCount; 3472 3473 start = Math.max(0, start); 3474 final int end = Math.min(childrenCount, start + count); 3475 3476 if (start == end) { 3477 return; 3478 } 3479 3480 if (end == childrenCount) { 3481 for (int i = start; i < end; i++) { 3482 children[i].mParent = null; 3483 children[i] = null; 3484 } 3485 } else { 3486 for (int i = start; i < end; i++) { 3487 children[i].mParent = null; 3488 } 3489 3490 // Since we're looping above, we might as well do the copy, but is arraycopy() 3491 // faster than the extra 2 bounds checks we would do in the loop? 3492 System.arraycopy(children, end, children, start, childrenCount - end); 3493 3494 for (int i = childrenCount - (end - start); i < childrenCount; i++) { 3495 children[i] = null; 3496 } 3497 } 3498 3499 mChildrenCount -= (end - start); 3500 } 3501 3502 private void bindLayoutAnimation(View child) { 3503 Animation a = mLayoutAnimationController.getAnimationForView(child); 3504 child.setAnimation(a); 3505 } 3506 3507 /** 3508 * Subclasses should override this method to set layout animation 3509 * parameters on the supplied child. 3510 * 3511 * @param child the child to associate with animation parameters 3512 * @param params the child's layout parameters which hold the animation 3513 * parameters 3514 * @param index the index of the child in the view group 3515 * @param count the number of children in the view group 3516 */ 3517 protected void attachLayoutAnimationParameters(View child, 3518 LayoutParams params, int index, int count) { 3519 LayoutAnimationController.AnimationParameters animationParams = 3520 params.layoutAnimationParameters; 3521 if (animationParams == null) { 3522 animationParams = new LayoutAnimationController.AnimationParameters(); 3523 params.layoutAnimationParameters = animationParams; 3524 } 3525 3526 animationParams.count = count; 3527 animationParams.index = index; 3528 } 3529 3530 /** 3531 * {@inheritDoc} 3532 */ 3533 public void removeView(View view) { 3534 removeViewInternal(view); 3535 requestLayout(); 3536 invalidate(true); 3537 } 3538 3539 /** 3540 * Removes a view during layout. This is useful if in your onLayout() method, 3541 * you need to remove more views. 3542 * 3543 * @param view the view to remove from the group 3544 */ 3545 public void removeViewInLayout(View view) { 3546 removeViewInternal(view); 3547 } 3548 3549 /** 3550 * Removes a range of views during layout. This is useful if in your onLayout() method, 3551 * you need to remove more views. 3552 * 3553 * @param start the index of the first view to remove from the group 3554 * @param count the number of views to remove from the group 3555 */ 3556 public void removeViewsInLayout(int start, int count) { 3557 removeViewsInternal(start, count); 3558 } 3559 3560 /** 3561 * Removes the view at the specified position in the group. 3562 * 3563 * @param index the position in the group of the view to remove 3564 */ 3565 public void removeViewAt(int index) { 3566 removeViewInternal(index, getChildAt(index)); 3567 requestLayout(); 3568 invalidate(true); 3569 } 3570 3571 /** 3572 * Removes the specified range of views from the group. 3573 * 3574 * @param start the first position in the group of the range of views to remove 3575 * @param count the number of views to remove 3576 */ 3577 public void removeViews(int start, int count) { 3578 removeViewsInternal(start, count); 3579 requestLayout(); 3580 invalidate(true); 3581 } 3582 3583 private void removeViewInternal(View view) { 3584 final int index = indexOfChild(view); 3585 if (index >= 0) { 3586 removeViewInternal(index, view); 3587 } 3588 } 3589 3590 private void removeViewInternal(int index, View view) { 3591 3592 if (mTransition != null) { 3593 mTransition.removeChild(this, view); 3594 } 3595 3596 boolean clearChildFocus = false; 3597 if (view == mFocused) { 3598 view.clearFocusForRemoval(); 3599 clearChildFocus = true; 3600 } 3601 3602 if (view.getAnimation() != null || 3603 (mTransitioningViews != null && mTransitioningViews.contains(view))) { 3604 addDisappearingView(view); 3605 } else if (view.mAttachInfo != null) { 3606 view.dispatchDetachedFromWindow(); 3607 } 3608 3609 onViewRemoved(view); 3610 3611 needGlobalAttributesUpdate(false); 3612 3613 removeFromArray(index); 3614 3615 if (clearChildFocus) { 3616 clearChildFocus(view); 3617 } 3618 } 3619 3620 /** 3621 * Sets the LayoutTransition object for this ViewGroup. If the LayoutTransition object is 3622 * not null, changes in layout which occur because of children being added to or removed from 3623 * the ViewGroup will be animated according to the animations defined in that LayoutTransition 3624 * object. By default, the transition object is null (so layout changes are not animated). 3625 * 3626 * @param transition The LayoutTransition object that will animated changes in layout. A value 3627 * of <code>null</code> means no transition will run on layout changes. 3628 * @attr ref android.R.styleable#ViewGroup_animateLayoutChanges 3629 */ 3630 public void setLayoutTransition(LayoutTransition transition) { 3631 if (mTransition != null) { 3632 mTransition.removeTransitionListener(mLayoutTransitionListener); 3633 } 3634 mTransition = transition; 3635 if (mTransition != null) { 3636 mTransition.addTransitionListener(mLayoutTransitionListener); 3637 } 3638 } 3639 3640 /** 3641 * Gets the LayoutTransition object for this ViewGroup. If the LayoutTransition object is 3642 * not null, changes in layout which occur because of children being added to or removed from 3643 * the ViewGroup will be animated according to the animations defined in that LayoutTransition 3644 * object. By default, the transition object is null (so layout changes are not animated). 3645 * 3646 * @return LayoutTranstion The LayoutTransition object that will animated changes in layout. 3647 * A value of <code>null</code> means no transition will run on layout changes. 3648 */ 3649 public LayoutTransition getLayoutTransition() { 3650 return mTransition; 3651 } 3652 3653 private void removeViewsInternal(int start, int count) { 3654 final View focused = mFocused; 3655 final boolean detach = mAttachInfo != null; 3656 View clearChildFocus = null; 3657 3658 final View[] children = mChildren; 3659 final int end = start + count; 3660 3661 for (int i = start; i < end; i++) { 3662 final View view = children[i]; 3663 3664 if (mTransition != null) { 3665 mTransition.removeChild(this, view); 3666 } 3667 3668 if (view == focused) { 3669 view.clearFocusForRemoval(); 3670 clearChildFocus = view; 3671 } 3672 3673 if (view.getAnimation() != null || 3674 (mTransitioningViews != null && mTransitioningViews.contains(view))) { 3675 addDisappearingView(view); 3676 } else if (detach) { 3677 view.dispatchDetachedFromWindow(); 3678 } 3679 3680 needGlobalAttributesUpdate(false); 3681 3682 onViewRemoved(view); 3683 } 3684 3685 removeFromArray(start, count); 3686 3687 if (clearChildFocus != null) { 3688 clearChildFocus(clearChildFocus); 3689 } 3690 } 3691 3692 /** 3693 * Call this method to remove all child views from the 3694 * ViewGroup. 3695 */ 3696 public void removeAllViews() { 3697 removeAllViewsInLayout(); 3698 requestLayout(); 3699 invalidate(true); 3700 } 3701 3702 /** 3703 * Called by a ViewGroup subclass to remove child views from itself, 3704 * when it must first know its size on screen before it can calculate how many 3705 * child views it will render. An example is a Gallery or a ListView, which 3706 * may "have" 50 children, but actually only render the number of children 3707 * that can currently fit inside the object on screen. Do not call 3708 * this method unless you are extending ViewGroup and understand the 3709 * view measuring and layout pipeline. 3710 */ 3711 public void removeAllViewsInLayout() { 3712 final int count = mChildrenCount; 3713 if (count <= 0) { 3714 return; 3715 } 3716 3717 final View[] children = mChildren; 3718 mChildrenCount = 0; 3719 3720 final View focused = mFocused; 3721 final boolean detach = mAttachInfo != null; 3722 View clearChildFocus = null; 3723 3724 needGlobalAttributesUpdate(false); 3725 3726 for (int i = count - 1; i >= 0; i--) { 3727 final View view = children[i]; 3728 3729 if (mTransition != null) { 3730 mTransition.removeChild(this, view); 3731 } 3732 3733 if (view == focused) { 3734 view.clearFocusForRemoval(); 3735 clearChildFocus = view; 3736 } 3737 3738 if (view.getAnimation() != null || 3739 (mTransitioningViews != null && mTransitioningViews.contains(view))) { 3740 addDisappearingView(view); 3741 } else if (detach) { 3742 view.dispatchDetachedFromWindow(); 3743 } 3744 3745 onViewRemoved(view); 3746 3747 view.mParent = null; 3748 children[i] = null; 3749 } 3750 3751 if (clearChildFocus != null) { 3752 clearChildFocus(clearChildFocus); 3753 } 3754 } 3755 3756 /** 3757 * Finishes the removal of a detached view. This method will dispatch the detached from 3758 * window event and notify the hierarchy change listener. 3759 * 3760 * @param child the child to be definitely removed from the view hierarchy 3761 * @param animate if true and the view has an animation, the view is placed in the 3762 * disappearing views list, otherwise, it is detached from the window 3763 * 3764 * @see #attachViewToParent(View, int, android.view.ViewGroup.LayoutParams) 3765 * @see #detachAllViewsFromParent() 3766 * @see #detachViewFromParent(View) 3767 * @see #detachViewFromParent(int) 3768 */ 3769 protected void removeDetachedView(View child, boolean animate) { 3770 if (mTransition != null) { 3771 mTransition.removeChild(this, child); 3772 } 3773 3774 if (child == mFocused) { 3775 child.clearFocus(); 3776 } 3777 3778 if ((animate && child.getAnimation() != null) || 3779 (mTransitioningViews != null && mTransitioningViews.contains(child))) { 3780 addDisappearingView(child); 3781 } else if (child.mAttachInfo != null) { 3782 child.dispatchDetachedFromWindow(); 3783 } 3784 3785 onViewRemoved(child); 3786 } 3787 3788 /** 3789 * Attaches a view to this view group. Attaching a view assigns this group as the parent, 3790 * sets the layout parameters and puts the view in the list of children so it can be retrieved 3791 * by calling {@link #getChildAt(int)}. 3792 * 3793 * This method should be called only for view which were detached from their parent. 3794 * 3795 * @param child the child to attach 3796 * @param index the index at which the child should be attached 3797 * @param params the layout parameters of the child 3798 * 3799 * @see #removeDetachedView(View, boolean) 3800 * @see #detachAllViewsFromParent() 3801 * @see #detachViewFromParent(View) 3802 * @see #detachViewFromParent(int) 3803 */ 3804 protected void attachViewToParent(View child, int index, LayoutParams params) { 3805 child.mLayoutParams = params; 3806 3807 if (index < 0) { 3808 index = mChildrenCount; 3809 } 3810 3811 addInArray(child, index); 3812 3813 child.mParent = this; 3814 child.mPrivateFlags = (child.mPrivateFlags & ~DIRTY_MASK & ~DRAWING_CACHE_VALID) | 3815 DRAWN | INVALIDATED; 3816 this.mPrivateFlags |= INVALIDATED; 3817 3818 if (child.hasFocus()) { 3819 requestChildFocus(child, child.findFocus()); 3820 } 3821 } 3822 3823 /** 3824 * Detaches a view from its parent. Detaching a view should be temporary and followed 3825 * either by a call to {@link #attachViewToParent(View, int, android.view.ViewGroup.LayoutParams)} 3826 * or a call to {@link #removeDetachedView(View, boolean)}. When a view is detached, 3827 * its parent is null and cannot be retrieved by a call to {@link #getChildAt(int)}. 3828 * 3829 * @param child the child to detach 3830 * 3831 * @see #detachViewFromParent(int) 3832 * @see #detachViewsFromParent(int, int) 3833 * @see #detachAllViewsFromParent() 3834 * @see #attachViewToParent(View, int, android.view.ViewGroup.LayoutParams) 3835 * @see #removeDetachedView(View, boolean) 3836 */ 3837 protected void detachViewFromParent(View child) { 3838 removeFromArray(indexOfChild(child)); 3839 } 3840 3841 /** 3842 * Detaches a view from its parent. Detaching a view should be temporary and followed 3843 * either by a call to {@link #attachViewToParent(View, int, android.view.ViewGroup.LayoutParams)} 3844 * or a call to {@link #removeDetachedView(View, boolean)}. When a view is detached, 3845 * its parent is null and cannot be retrieved by a call to {@link #getChildAt(int)}. 3846 * 3847 * @param index the index of the child to detach 3848 * 3849 * @see #detachViewFromParent(View) 3850 * @see #detachAllViewsFromParent() 3851 * @see #detachViewsFromParent(int, int) 3852 * @see #attachViewToParent(View, int, android.view.ViewGroup.LayoutParams) 3853 * @see #removeDetachedView(View, boolean) 3854 */ 3855 protected void detachViewFromParent(int index) { 3856 removeFromArray(index); 3857 } 3858 3859 /** 3860 * Detaches a range of view from their parent. Detaching a view should be temporary and followed 3861 * either by a call to {@link #attachViewToParent(View, int, android.view.ViewGroup.LayoutParams)} 3862 * or a call to {@link #removeDetachedView(View, boolean)}. When a view is detached, its 3863 * parent is null and cannot be retrieved by a call to {@link #getChildAt(int)}. 3864 * 3865 * @param start the first index of the childrend range to detach 3866 * @param count the number of children to detach 3867 * 3868 * @see #detachViewFromParent(View) 3869 * @see #detachViewFromParent(int) 3870 * @see #detachAllViewsFromParent() 3871 * @see #attachViewToParent(View, int, android.view.ViewGroup.LayoutParams) 3872 * @see #removeDetachedView(View, boolean) 3873 */ 3874 protected void detachViewsFromParent(int start, int count) { 3875 removeFromArray(start, count); 3876 } 3877 3878 /** 3879 * Detaches all views from the parent. Detaching a view should be temporary and followed 3880 * either by a call to {@link #attachViewToParent(View, int, android.view.ViewGroup.LayoutParams)} 3881 * or a call to {@link #removeDetachedView(View, boolean)}. When a view is detached, 3882 * its parent is null and cannot be retrieved by a call to {@link #getChildAt(int)}. 3883 * 3884 * @see #detachViewFromParent(View) 3885 * @see #detachViewFromParent(int) 3886 * @see #detachViewsFromParent(int, int) 3887 * @see #attachViewToParent(View, int, android.view.ViewGroup.LayoutParams) 3888 * @see #removeDetachedView(View, boolean) 3889 */ 3890 protected void detachAllViewsFromParent() { 3891 final int count = mChildrenCount; 3892 if (count <= 0) { 3893 return; 3894 } 3895 3896 final View[] children = mChildren; 3897 mChildrenCount = 0; 3898 3899 for (int i = count - 1; i >= 0; i--) { 3900 children[i].mParent = null; 3901 children[i] = null; 3902 } 3903 } 3904 3905 /** 3906 * Don't call or override this method. It is used for the implementation of 3907 * the view hierarchy. 3908 */ 3909 public final void invalidateChild(View child, final Rect dirty) { 3910 if (ViewDebug.TRACE_HIERARCHY) { 3911 ViewDebug.trace(this, ViewDebug.HierarchyTraceType.INVALIDATE_CHILD); 3912 } 3913 3914 ViewParent parent = this; 3915 3916 final AttachInfo attachInfo = mAttachInfo; 3917 if (attachInfo != null) { 3918 // If the child is drawing an animation, we want to copy this flag onto 3919 // ourselves and the parent to make sure the invalidate request goes 3920 // through 3921 final boolean drawAnimation = (child.mPrivateFlags & DRAW_ANIMATION) == DRAW_ANIMATION; 3922 3923 if (dirty == null) { 3924 if (child.mLayerType != LAYER_TYPE_NONE) { 3925 mPrivateFlags |= INVALIDATED; 3926 mPrivateFlags &= ~DRAWING_CACHE_VALID; 3927 child.mLocalDirtyRect.setEmpty(); 3928 } 3929 do { 3930 View view = null; 3931 if (parent instanceof View) { 3932 view = (View) parent; 3933 if (view.mLayerType != LAYER_TYPE_NONE) { 3934 view.mLocalDirtyRect.setEmpty(); 3935 if (view.getParent() instanceof View) { 3936 final View grandParent = (View) view.getParent(); 3937 grandParent.mPrivateFlags |= INVALIDATED; 3938 grandParent.mPrivateFlags &= ~DRAWING_CACHE_VALID; 3939 } 3940 } 3941 if ((view.mPrivateFlags & DIRTY_MASK) != 0) { 3942 // already marked dirty - we're done 3943 break; 3944 } 3945 } 3946 3947 if (drawAnimation) { 3948 if (view != null) { 3949 view.mPrivateFlags |= DRAW_ANIMATION; 3950 } else if (parent instanceof ViewRootImpl) { 3951 ((ViewRootImpl) parent).mIsAnimating = true; 3952 } 3953 } 3954 3955 if (parent instanceof ViewRootImpl) { 3956 ((ViewRootImpl) parent).invalidate(); 3957 parent = null; 3958 } else if (view != null) { 3959 if ((view.mPrivateFlags & DRAWN) == DRAWN || 3960 (view.mPrivateFlags & DRAWING_CACHE_VALID) == DRAWING_CACHE_VALID) { 3961 view.mPrivateFlags &= ~DRAWING_CACHE_VALID; 3962 view.mPrivateFlags |= DIRTY; 3963 parent = view.mParent; 3964 } else { 3965 parent = null; 3966 } 3967 } 3968 } while (parent != null); 3969 } else { 3970 // Check whether the child that requests the invalidate is fully opaque 3971 // Views being animated or transformed are not considered opaque because we may 3972 // be invalidating their old position and need the parent to paint behind them. 3973 Matrix childMatrix = child.getMatrix(); 3974 final boolean isOpaque = child.isOpaque() && !drawAnimation && 3975 child.getAnimation() == null && childMatrix.isIdentity(); 3976 // Mark the child as dirty, using the appropriate flag 3977 // Make sure we do not set both flags at the same time 3978 int opaqueFlag = isOpaque ? DIRTY_OPAQUE : DIRTY; 3979 3980 if (child.mLayerType != LAYER_TYPE_NONE) { 3981 mPrivateFlags |= INVALIDATED; 3982 mPrivateFlags &= ~DRAWING_CACHE_VALID; 3983 child.mLocalDirtyRect.union(dirty); 3984 } 3985 3986 final int[] location = attachInfo.mInvalidateChildLocation; 3987 location[CHILD_LEFT_INDEX] = child.mLeft; 3988 location[CHILD_TOP_INDEX] = child.mTop; 3989 if (!childMatrix.isIdentity()) { 3990 RectF boundingRect = attachInfo.mTmpTransformRect; 3991 boundingRect.set(dirty); 3992 //boundingRect.inset(-0.5f, -0.5f); 3993 childMatrix.mapRect(boundingRect); 3994 dirty.set((int) (boundingRect.left - 0.5f), 3995 (int) (boundingRect.top - 0.5f), 3996 (int) (boundingRect.right + 0.5f), 3997 (int) (boundingRect.bottom + 0.5f)); 3998 } 3999 4000 do { 4001 View view = null; 4002 if (parent instanceof View) { 4003 view = (View) parent; 4004 if (view.mLayerType != LAYER_TYPE_NONE && 4005 view.getParent() instanceof View) { 4006 final View grandParent = (View) view.getParent(); 4007 grandParent.mPrivateFlags |= INVALIDATED; 4008 grandParent.mPrivateFlags &= ~DRAWING_CACHE_VALID; 4009 } 4010 } 4011 4012 if (drawAnimation) { 4013 if (view != null) { 4014 view.mPrivateFlags |= DRAW_ANIMATION; 4015 } else if (parent instanceof ViewRootImpl) { 4016 ((ViewRootImpl) parent).mIsAnimating = true; 4017 } 4018 } 4019 4020 // If the parent is dirty opaque or not dirty, mark it dirty with the opaque 4021 // flag coming from the child that initiated the invalidate 4022 if (view != null) { 4023 if ((view.mViewFlags & FADING_EDGE_MASK) != 0 && 4024 view.getSolidColor() == 0) { 4025 opaqueFlag = DIRTY; 4026 } 4027 if ((view.mPrivateFlags & DIRTY_MASK) != DIRTY) { 4028 view.mPrivateFlags = (view.mPrivateFlags & ~DIRTY_MASK) | opaqueFlag; 4029 } 4030 } 4031 4032 parent = parent.invalidateChildInParent(location, dirty); 4033 if (view != null) { 4034 // Account for transform on current parent 4035 Matrix m = view.getMatrix(); 4036 if (!m.isIdentity()) { 4037 RectF boundingRect = attachInfo.mTmpTransformRect; 4038 boundingRect.set(dirty); 4039 m.mapRect(boundingRect); 4040 dirty.set((int) boundingRect.left, (int) boundingRect.top, 4041 (int) (boundingRect.right + 0.5f), 4042 (int) (boundingRect.bottom + 0.5f)); 4043 } 4044 } 4045 } while (parent != null); 4046 } 4047 } 4048 } 4049 4050 /** 4051 * Don't call or override this method. It is used for the implementation of 4052 * the view hierarchy. 4053 * 4054 * This implementation returns null if this ViewGroup does not have a parent, 4055 * if this ViewGroup is already fully invalidated or if the dirty rectangle 4056 * does not intersect with this ViewGroup's bounds. 4057 */ 4058 public ViewParent invalidateChildInParent(final int[] location, final Rect dirty) { 4059 if (ViewDebug.TRACE_HIERARCHY) { 4060 ViewDebug.trace(this, ViewDebug.HierarchyTraceType.INVALIDATE_CHILD_IN_PARENT); 4061 } 4062 4063 if ((mPrivateFlags & DRAWN) == DRAWN || 4064 (mPrivateFlags & DRAWING_CACHE_VALID) == DRAWING_CACHE_VALID) { 4065 if ((mGroupFlags & (FLAG_OPTIMIZE_INVALIDATE | FLAG_ANIMATION_DONE)) != 4066 FLAG_OPTIMIZE_INVALIDATE) { 4067 dirty.offset(location[CHILD_LEFT_INDEX] - mScrollX, 4068 location[CHILD_TOP_INDEX] - mScrollY); 4069 4070 final int left = mLeft; 4071 final int top = mTop; 4072 4073 if ((mGroupFlags & FLAG_CLIP_CHILDREN) != FLAG_CLIP_CHILDREN || 4074 dirty.intersect(0, 0, mRight - left, mBottom - top) || 4075 (mPrivateFlags & DRAW_ANIMATION) == DRAW_ANIMATION) { 4076 mPrivateFlags &= ~DRAWING_CACHE_VALID; 4077 4078 location[CHILD_LEFT_INDEX] = left; 4079 location[CHILD_TOP_INDEX] = top; 4080 4081 if (mLayerType != LAYER_TYPE_NONE) { 4082 mLocalDirtyRect.union(dirty); 4083 } 4084 4085 return mParent; 4086 } 4087 } else { 4088 mPrivateFlags &= ~DRAWN & ~DRAWING_CACHE_VALID; 4089 4090 location[CHILD_LEFT_INDEX] = mLeft; 4091 location[CHILD_TOP_INDEX] = mTop; 4092 if ((mGroupFlags & FLAG_CLIP_CHILDREN) == FLAG_CLIP_CHILDREN) { 4093 dirty.set(0, 0, mRight - mLeft, mBottom - mTop); 4094 } else { 4095 // in case the dirty rect extends outside the bounds of this container 4096 dirty.union(0, 0, mRight - mLeft, mBottom - mTop); 4097 } 4098 4099 if (mLayerType != LAYER_TYPE_NONE) { 4100 mLocalDirtyRect.union(dirty); 4101 } 4102 4103 return mParent; 4104 } 4105 } 4106 4107 return null; 4108 } 4109 4110 /** 4111 * Offset a rectangle that is in a descendant's coordinate 4112 * space into our coordinate space. 4113 * @param descendant A descendant of this view 4114 * @param rect A rectangle defined in descendant's coordinate space. 4115 */ 4116 public final void offsetDescendantRectToMyCoords(View descendant, Rect rect) { 4117 offsetRectBetweenParentAndChild(descendant, rect, true, false); 4118 } 4119 4120 /** 4121 * Offset a rectangle that is in our coordinate space into an ancestor's 4122 * coordinate space. 4123 * @param descendant A descendant of this view 4124 * @param rect A rectangle defined in descendant's coordinate space. 4125 */ 4126 public final void offsetRectIntoDescendantCoords(View descendant, Rect rect) { 4127 offsetRectBetweenParentAndChild(descendant, rect, false, false); 4128 } 4129 4130 /** 4131 * Helper method that offsets a rect either from parent to descendant or 4132 * descendant to parent. 4133 */ 4134 void offsetRectBetweenParentAndChild(View descendant, Rect rect, 4135 boolean offsetFromChildToParent, boolean clipToBounds) { 4136 4137 // already in the same coord system :) 4138 if (descendant == this) { 4139 return; 4140 } 4141 4142 ViewParent theParent = descendant.mParent; 4143 4144 // search and offset up to the parent 4145 while ((theParent != null) 4146 && (theParent instanceof View) 4147 && (theParent != this)) { 4148 4149 if (offsetFromChildToParent) { 4150 rect.offset(descendant.mLeft - descendant.mScrollX, 4151 descendant.mTop - descendant.mScrollY); 4152 if (clipToBounds) { 4153 View p = (View) theParent; 4154 rect.intersect(0, 0, p.mRight - p.mLeft, p.mBottom - p.mTop); 4155 } 4156 } else { 4157 if (clipToBounds) { 4158 View p = (View) theParent; 4159 rect.intersect(0, 0, p.mRight - p.mLeft, p.mBottom - p.mTop); 4160 } 4161 rect.offset(descendant.mScrollX - descendant.mLeft, 4162 descendant.mScrollY - descendant.mTop); 4163 } 4164 4165 descendant = (View) theParent; 4166 theParent = descendant.mParent; 4167 } 4168 4169 // now that we are up to this view, need to offset one more time 4170 // to get into our coordinate space 4171 if (theParent == this) { 4172 if (offsetFromChildToParent) { 4173 rect.offset(descendant.mLeft - descendant.mScrollX, 4174 descendant.mTop - descendant.mScrollY); 4175 } else { 4176 rect.offset(descendant.mScrollX - descendant.mLeft, 4177 descendant.mScrollY - descendant.mTop); 4178 } 4179 } else { 4180 throw new IllegalArgumentException("parameter must be a descendant of this view"); 4181 } 4182 } 4183 4184 /** 4185 * Offset the vertical location of all children of this view by the specified number of pixels. 4186 * 4187 * @param offset the number of pixels to offset 4188 * 4189 * @hide 4190 */ 4191 public void offsetChildrenTopAndBottom(int offset) { 4192 final int count = mChildrenCount; 4193 final View[] children = mChildren; 4194 4195 for (int i = 0; i < count; i++) { 4196 final View v = children[i]; 4197 v.mTop += offset; 4198 v.mBottom += offset; 4199 } 4200 } 4201 4202 /** 4203 * {@inheritDoc} 4204 */ 4205 public boolean getChildVisibleRect(View child, Rect r, android.graphics.Point offset) { 4206 // It doesn't make a whole lot of sense to call this on a view that isn't attached, 4207 // but for some simple tests it can be useful. If we don't have attach info this 4208 // will allocate memory. 4209 final RectF rect = mAttachInfo != null ? mAttachInfo.mTmpTransformRect : new RectF(); 4210 rect.set(r); 4211 4212 if (!child.hasIdentityMatrix()) { 4213 child.getMatrix().mapRect(rect); 4214 } 4215 4216 int dx = child.mLeft - mScrollX; 4217 int dy = child.mTop - mScrollY; 4218 4219 rect.offset(dx, dy); 4220 4221 if (offset != null) { 4222 if (!child.hasIdentityMatrix()) { 4223 float[] position = mAttachInfo != null ? mAttachInfo.mTmpTransformLocation 4224 : new float[2]; 4225 position[0] = offset.x; 4226 position[1] = offset.y; 4227 child.getMatrix().mapPoints(position); 4228 offset.x = (int) (position[0] + 0.5f); 4229 offset.y = (int) (position[1] + 0.5f); 4230 } 4231 offset.x += dx; 4232 offset.y += dy; 4233 } 4234 4235 if (rect.intersect(0, 0, mRight - mLeft, mBottom - mTop)) { 4236 if (mParent == null) return true; 4237 r.set((int) (rect.left + 0.5f), (int) (rect.top + 0.5f), 4238 (int) (rect.right + 0.5f), (int) (rect.bottom + 0.5f)); 4239 return mParent.getChildVisibleRect(this, r, offset); 4240 } 4241 4242 return false; 4243 } 4244 4245 /** 4246 * {@inheritDoc} 4247 */ 4248 @Override 4249 public final void layout(int l, int t, int r, int b) { 4250 if (mTransition == null || !mTransition.isChangingLayout()) { 4251 super.layout(l, t, r, b); 4252 } else { 4253 // record the fact that we noop'd it; request layout when transition finishes 4254 mLayoutSuppressed = true; 4255 } 4256 } 4257 4258 /** 4259 * {@inheritDoc} 4260 */ 4261 @Override 4262 protected abstract void onLayout(boolean changed, 4263 int l, int t, int r, int b); 4264 4265 /** 4266 * Indicates whether the view group has the ability to animate its children 4267 * after the first layout. 4268 * 4269 * @return true if the children can be animated, false otherwise 4270 */ 4271 protected boolean canAnimate() { 4272 return mLayoutAnimationController != null; 4273 } 4274 4275 /** 4276 * Runs the layout animation. Calling this method triggers a relayout of 4277 * this view group. 4278 */ 4279 public void startLayoutAnimation() { 4280 if (mLayoutAnimationController != null) { 4281 mGroupFlags |= FLAG_RUN_ANIMATION; 4282 requestLayout(); 4283 } 4284 } 4285 4286 /** 4287 * Schedules the layout animation to be played after the next layout pass 4288 * of this view group. This can be used to restart the layout animation 4289 * when the content of the view group changes or when the activity is 4290 * paused and resumed. 4291 */ 4292 public void scheduleLayoutAnimation() { 4293 mGroupFlags |= FLAG_RUN_ANIMATION; 4294 } 4295 4296 /** 4297 * Sets the layout animation controller used to animate the group's 4298 * children after the first layout. 4299 * 4300 * @param controller the animation controller 4301 */ 4302 public void setLayoutAnimation(LayoutAnimationController controller) { 4303 mLayoutAnimationController = controller; 4304 if (mLayoutAnimationController != null) { 4305 mGroupFlags |= FLAG_RUN_ANIMATION; 4306 } 4307 } 4308 4309 /** 4310 * Returns the layout animation controller used to animate the group's 4311 * children. 4312 * 4313 * @return the current animation controller 4314 */ 4315 public LayoutAnimationController getLayoutAnimation() { 4316 return mLayoutAnimationController; 4317 } 4318 4319 /** 4320 * Indicates whether the children's drawing cache is used during a layout 4321 * animation. By default, the drawing cache is enabled but this will prevent 4322 * nested layout animations from working. To nest animations, you must disable 4323 * the cache. 4324 * 4325 * @return true if the animation cache is enabled, false otherwise 4326 * 4327 * @see #setAnimationCacheEnabled(boolean) 4328 * @see View#setDrawingCacheEnabled(boolean) 4329 */ 4330 @ViewDebug.ExportedProperty 4331 public boolean isAnimationCacheEnabled() { 4332 return (mGroupFlags & FLAG_ANIMATION_CACHE) == FLAG_ANIMATION_CACHE; 4333 } 4334 4335 /** 4336 * Enables or disables the children's drawing cache during a layout animation. 4337 * By default, the drawing cache is enabled but this will prevent nested 4338 * layout animations from working. To nest animations, you must disable the 4339 * cache. 4340 * 4341 * @param enabled true to enable the animation cache, false otherwise 4342 * 4343 * @see #isAnimationCacheEnabled() 4344 * @see View#setDrawingCacheEnabled(boolean) 4345 */ 4346 public void setAnimationCacheEnabled(boolean enabled) { 4347 setBooleanFlag(FLAG_ANIMATION_CACHE, enabled); 4348 } 4349 4350 /** 4351 * Indicates whether this ViewGroup will always try to draw its children using their 4352 * drawing cache. By default this property is enabled. 4353 * 4354 * @return true if the animation cache is enabled, false otherwise 4355 * 4356 * @see #setAlwaysDrawnWithCacheEnabled(boolean) 4357 * @see #setChildrenDrawnWithCacheEnabled(boolean) 4358 * @see View#setDrawingCacheEnabled(boolean) 4359 */ 4360 @ViewDebug.ExportedProperty(category = "drawing") 4361 public boolean isAlwaysDrawnWithCacheEnabled() { 4362 return (mGroupFlags & FLAG_ALWAYS_DRAWN_WITH_CACHE) == FLAG_ALWAYS_DRAWN_WITH_CACHE; 4363 } 4364 4365 /** 4366 * Indicates whether this ViewGroup will always try to draw its children using their 4367 * drawing cache. This property can be set to true when the cache rendering is 4368 * slightly different from the children's normal rendering. Renderings can be different, 4369 * for instance, when the cache's quality is set to low. 4370 * 4371 * When this property is disabled, the ViewGroup will use the drawing cache of its 4372 * children only when asked to. It's usually the task of subclasses to tell ViewGroup 4373 * when to start using the drawing cache and when to stop using it. 4374 * 4375 * @param always true to always draw with the drawing cache, false otherwise 4376 * 4377 * @see #isAlwaysDrawnWithCacheEnabled() 4378 * @see #setChildrenDrawnWithCacheEnabled(boolean) 4379 * @see View#setDrawingCacheEnabled(boolean) 4380 * @see View#setDrawingCacheQuality(int) 4381 */ 4382 public void setAlwaysDrawnWithCacheEnabled(boolean always) { 4383 setBooleanFlag(FLAG_ALWAYS_DRAWN_WITH_CACHE, always); 4384 } 4385 4386 /** 4387 * Indicates whether the ViewGroup is currently drawing its children using 4388 * their drawing cache. 4389 * 4390 * @return true if children should be drawn with their cache, false otherwise 4391 * 4392 * @see #setAlwaysDrawnWithCacheEnabled(boolean) 4393 * @see #setChildrenDrawnWithCacheEnabled(boolean) 4394 */ 4395 @ViewDebug.ExportedProperty(category = "drawing") 4396 protected boolean isChildrenDrawnWithCacheEnabled() { 4397 return (mGroupFlags & FLAG_CHILDREN_DRAWN_WITH_CACHE) == FLAG_CHILDREN_DRAWN_WITH_CACHE; 4398 } 4399 4400 /** 4401 * Tells the ViewGroup to draw its children using their drawing cache. This property 4402 * is ignored when {@link #isAlwaysDrawnWithCacheEnabled()} is true. A child's drawing cache 4403 * will be used only if it has been enabled. 4404 * 4405 * Subclasses should call this method to start and stop using the drawing cache when 4406 * they perform performance sensitive operations, like scrolling or animating. 4407 * 4408 * @param enabled true if children should be drawn with their cache, false otherwise 4409 * 4410 * @see #setAlwaysDrawnWithCacheEnabled(boolean) 4411 * @see #isChildrenDrawnWithCacheEnabled() 4412 */ 4413 protected void setChildrenDrawnWithCacheEnabled(boolean enabled) { 4414 setBooleanFlag(FLAG_CHILDREN_DRAWN_WITH_CACHE, enabled); 4415 } 4416 4417 /** 4418 * Indicates whether the ViewGroup is drawing its children in the order defined by 4419 * {@link #getChildDrawingOrder(int, int)}. 4420 * 4421 * @return true if children drawing order is defined by {@link #getChildDrawingOrder(int, int)}, 4422 * false otherwise 4423 * 4424 * @see #setChildrenDrawingOrderEnabled(boolean) 4425 * @see #getChildDrawingOrder(int, int) 4426 */ 4427 @ViewDebug.ExportedProperty(category = "drawing") 4428 protected boolean isChildrenDrawingOrderEnabled() { 4429 return (mGroupFlags & FLAG_USE_CHILD_DRAWING_ORDER) == FLAG_USE_CHILD_DRAWING_ORDER; 4430 } 4431 4432 /** 4433 * Tells the ViewGroup whether to draw its children in the order defined by the method 4434 * {@link #getChildDrawingOrder(int, int)}. 4435 * 4436 * @param enabled true if the order of the children when drawing is determined by 4437 * {@link #getChildDrawingOrder(int, int)}, false otherwise 4438 * 4439 * @see #isChildrenDrawingOrderEnabled() 4440 * @see #getChildDrawingOrder(int, int) 4441 */ 4442 protected void setChildrenDrawingOrderEnabled(boolean enabled) { 4443 setBooleanFlag(FLAG_USE_CHILD_DRAWING_ORDER, enabled); 4444 } 4445 4446 private void setBooleanFlag(int flag, boolean value) { 4447 if (value) { 4448 mGroupFlags |= flag; 4449 } else { 4450 mGroupFlags &= ~flag; 4451 } 4452 } 4453 4454 /** 4455 * Returns an integer indicating what types of drawing caches are kept in memory. 4456 * 4457 * @see #setPersistentDrawingCache(int) 4458 * @see #setAnimationCacheEnabled(boolean) 4459 * 4460 * @return one or a combination of {@link #PERSISTENT_NO_CACHE}, 4461 * {@link #PERSISTENT_ANIMATION_CACHE}, {@link #PERSISTENT_SCROLLING_CACHE} 4462 * and {@link #PERSISTENT_ALL_CACHES} 4463 */ 4464 @ViewDebug.ExportedProperty(category = "drawing", mapping = { 4465 @ViewDebug.IntToString(from = PERSISTENT_NO_CACHE, to = "NONE"), 4466 @ViewDebug.IntToString(from = PERSISTENT_ANIMATION_CACHE, to = "ANIMATION"), 4467 @ViewDebug.IntToString(from = PERSISTENT_SCROLLING_CACHE, to = "SCROLLING"), 4468 @ViewDebug.IntToString(from = PERSISTENT_ALL_CACHES, to = "ALL") 4469 }) 4470 public int getPersistentDrawingCache() { 4471 return mPersistentDrawingCache; 4472 } 4473 4474 /** 4475 * Indicates what types of drawing caches should be kept in memory after 4476 * they have been created. 4477 * 4478 * @see #getPersistentDrawingCache() 4479 * @see #setAnimationCacheEnabled(boolean) 4480 * 4481 * @param drawingCacheToKeep one or a combination of {@link #PERSISTENT_NO_CACHE}, 4482 * {@link #PERSISTENT_ANIMATION_CACHE}, {@link #PERSISTENT_SCROLLING_CACHE} 4483 * and {@link #PERSISTENT_ALL_CACHES} 4484 */ 4485 public void setPersistentDrawingCache(int drawingCacheToKeep) { 4486 mPersistentDrawingCache = drawingCacheToKeep & PERSISTENT_ALL_CACHES; 4487 } 4488 4489 /** 4490 * Returns a new set of layout parameters based on the supplied attributes set. 4491 * 4492 * @param attrs the attributes to build the layout parameters from 4493 * 4494 * @return an instance of {@link android.view.ViewGroup.LayoutParams} or one 4495 * of its descendants 4496 */ 4497 public LayoutParams generateLayoutParams(AttributeSet attrs) { 4498 return new LayoutParams(getContext(), attrs); 4499 } 4500 4501 /** 4502 * Returns a safe set of layout parameters based on the supplied layout params. 4503 * When a ViewGroup is passed a View whose layout params do not pass the test of 4504 * {@link #checkLayoutParams(android.view.ViewGroup.LayoutParams)}, this method 4505 * is invoked. This method should return a new set of layout params suitable for 4506 * this ViewGroup, possibly by copying the appropriate attributes from the 4507 * specified set of layout params. 4508 * 4509 * @param p The layout parameters to convert into a suitable set of layout parameters 4510 * for this ViewGroup. 4511 * 4512 * @return an instance of {@link android.view.ViewGroup.LayoutParams} or one 4513 * of its descendants 4514 */ 4515 protected LayoutParams generateLayoutParams(ViewGroup.LayoutParams p) { 4516 return p; 4517 } 4518 4519 /** 4520 * Returns a set of default layout parameters. These parameters are requested 4521 * when the View passed to {@link #addView(View)} has no layout parameters 4522 * already set. If null is returned, an exception is thrown from addView. 4523 * 4524 * @return a set of default layout parameters or null 4525 */ 4526 protected LayoutParams generateDefaultLayoutParams() { 4527 return new LayoutParams(LayoutParams.WRAP_CONTENT, LayoutParams.WRAP_CONTENT); 4528 } 4529 4530 /** 4531 * @hide 4532 */ 4533 @Override 4534 protected boolean dispatchConsistencyCheck(int consistency) { 4535 boolean result = super.dispatchConsistencyCheck(consistency); 4536 4537 final int count = mChildrenCount; 4538 final View[] children = mChildren; 4539 for (int i = 0; i < count; i++) { 4540 if (!children[i].dispatchConsistencyCheck(consistency)) result = false; 4541 } 4542 4543 return result; 4544 } 4545 4546 /** 4547 * @hide 4548 */ 4549 @Override 4550 protected boolean onConsistencyCheck(int consistency) { 4551 boolean result = super.onConsistencyCheck(consistency); 4552 4553 final boolean checkLayout = (consistency & ViewDebug.CONSISTENCY_LAYOUT) != 0; 4554 final boolean checkDrawing = (consistency & ViewDebug.CONSISTENCY_DRAWING) != 0; 4555 4556 if (checkLayout) { 4557 final int count = mChildrenCount; 4558 final View[] children = mChildren; 4559 for (int i = 0; i < count; i++) { 4560 if (children[i].getParent() != this) { 4561 result = false; 4562 android.util.Log.d(ViewDebug.CONSISTENCY_LOG_TAG, 4563 "View " + children[i] + " has no parent/a parent that is not " + this); 4564 } 4565 } 4566 } 4567 4568 if (checkDrawing) { 4569 // If this group is dirty, check that the parent is dirty as well 4570 if ((mPrivateFlags & DIRTY_MASK) != 0) { 4571 final ViewParent parent = getParent(); 4572 if (parent != null && !(parent instanceof ViewRootImpl)) { 4573 if ((((View) parent).mPrivateFlags & DIRTY_MASK) == 0) { 4574 result = false; 4575 android.util.Log.d(ViewDebug.CONSISTENCY_LOG_TAG, 4576 "ViewGroup " + this + " is dirty but its parent is not: " + this); 4577 } 4578 } 4579 } 4580 } 4581 4582 return result; 4583 } 4584 4585 /** 4586 * {@inheritDoc} 4587 */ 4588 @Override 4589 protected void debug(int depth) { 4590 super.debug(depth); 4591 String output; 4592 4593 if (mFocused != null) { 4594 output = debugIndent(depth); 4595 output += "mFocused"; 4596 Log.d(VIEW_LOG_TAG, output); 4597 } 4598 if (mChildrenCount != 0) { 4599 output = debugIndent(depth); 4600 output += "{"; 4601 Log.d(VIEW_LOG_TAG, output); 4602 } 4603 int count = mChildrenCount; 4604 for (int i = 0; i < count; i++) { 4605 View child = mChildren[i]; 4606 child.debug(depth + 1); 4607 } 4608 4609 if (mChildrenCount != 0) { 4610 output = debugIndent(depth); 4611 output += "}"; 4612 Log.d(VIEW_LOG_TAG, output); 4613 } 4614 } 4615 4616 /** 4617 * Returns the position in the group of the specified child view. 4618 * 4619 * @param child the view for which to get the position 4620 * @return a positive integer representing the position of the view in the 4621 * group, or -1 if the view does not exist in the group 4622 */ 4623 public int indexOfChild(View child) { 4624 final int count = mChildrenCount; 4625 final View[] children = mChildren; 4626 for (int i = 0; i < count; i++) { 4627 if (children[i] == child) { 4628 return i; 4629 } 4630 } 4631 return -1; 4632 } 4633 4634 /** 4635 * Returns the number of children in the group. 4636 * 4637 * @return a positive integer representing the number of children in 4638 * the group 4639 */ 4640 public int getChildCount() { 4641 return mChildrenCount; 4642 } 4643 4644 /** 4645 * Returns the view at the specified position in the group. 4646 * 4647 * @param index the position at which to get the view from 4648 * @return the view at the specified position or null if the position 4649 * does not exist within the group 4650 */ 4651 public View getChildAt(int index) { 4652 if (index < 0 || index >= mChildrenCount) { 4653 return null; 4654 } 4655 return mChildren[index]; 4656 } 4657 4658 /** 4659 * Ask all of the children of this view to measure themselves, taking into 4660 * account both the MeasureSpec requirements for this view and its padding. 4661 * We skip children that are in the GONE state The heavy lifting is done in 4662 * getChildMeasureSpec. 4663 * 4664 * @param widthMeasureSpec The width requirements for this view 4665 * @param heightMeasureSpec The height requirements for this view 4666 */ 4667 protected void measureChildren(int widthMeasureSpec, int heightMeasureSpec) { 4668 final int size = mChildrenCount; 4669 final View[] children = mChildren; 4670 for (int i = 0; i < size; ++i) { 4671 final View child = children[i]; 4672 if ((child.mViewFlags & VISIBILITY_MASK) != GONE) { 4673 measureChild(child, widthMeasureSpec, heightMeasureSpec); 4674 } 4675 } 4676 } 4677 4678 /** 4679 * Ask one of the children of this view to measure itself, taking into 4680 * account both the MeasureSpec requirements for this view and its padding. 4681 * The heavy lifting is done in getChildMeasureSpec. 4682 * 4683 * @param child The child to measure 4684 * @param parentWidthMeasureSpec The width requirements for this view 4685 * @param parentHeightMeasureSpec The height requirements for this view 4686 */ 4687 protected void measureChild(View child, int parentWidthMeasureSpec, 4688 int parentHeightMeasureSpec) { 4689 final LayoutParams lp = child.getLayoutParams(); 4690 4691 final int childWidthMeasureSpec = getChildMeasureSpec(parentWidthMeasureSpec, 4692 mPaddingLeft + mPaddingRight, lp.width); 4693 final int childHeightMeasureSpec = getChildMeasureSpec(parentHeightMeasureSpec, 4694 mPaddingTop + mPaddingBottom, lp.height); 4695 4696 child.measure(childWidthMeasureSpec, childHeightMeasureSpec); 4697 } 4698 4699 /** 4700 * Ask one of the children of this view to measure itself, taking into 4701 * account both the MeasureSpec requirements for this view and its padding 4702 * and margins. The child must have MarginLayoutParams The heavy lifting is 4703 * done in getChildMeasureSpec. 4704 * 4705 * @param child The child to measure 4706 * @param parentWidthMeasureSpec The width requirements for this view 4707 * @param widthUsed Extra space that has been used up by the parent 4708 * horizontally (possibly by other children of the parent) 4709 * @param parentHeightMeasureSpec The height requirements for this view 4710 * @param heightUsed Extra space that has been used up by the parent 4711 * vertically (possibly by other children of the parent) 4712 */ 4713 protected void measureChildWithMargins(View child, 4714 int parentWidthMeasureSpec, int widthUsed, 4715 int parentHeightMeasureSpec, int heightUsed) { 4716 final MarginLayoutParams lp = (MarginLayoutParams) child.getLayoutParams(); 4717 4718 final int childWidthMeasureSpec = getChildMeasureSpec(parentWidthMeasureSpec, 4719 mPaddingLeft + mPaddingRight + lp.leftMargin + lp.rightMargin 4720 + widthUsed, lp.width); 4721 final int childHeightMeasureSpec = getChildMeasureSpec(parentHeightMeasureSpec, 4722 mPaddingTop + mPaddingBottom + lp.topMargin + lp.bottomMargin 4723 + heightUsed, lp.height); 4724 4725 child.measure(childWidthMeasureSpec, childHeightMeasureSpec); 4726 } 4727 4728 /** 4729 * Does the hard part of measureChildren: figuring out the MeasureSpec to 4730 * pass to a particular child. This method figures out the right MeasureSpec 4731 * for one dimension (height or width) of one child view. 4732 * 4733 * The goal is to combine information from our MeasureSpec with the 4734 * LayoutParams of the child to get the best possible results. For example, 4735 * if the this view knows its size (because its MeasureSpec has a mode of 4736 * EXACTLY), and the child has indicated in its LayoutParams that it wants 4737 * to be the same size as the parent, the parent should ask the child to 4738 * layout given an exact size. 4739 * 4740 * @param spec The requirements for this view 4741 * @param padding The padding of this view for the current dimension and 4742 * margins, if applicable 4743 * @param childDimension How big the child wants to be in the current 4744 * dimension 4745 * @return a MeasureSpec integer for the child 4746 */ 4747 public static int getChildMeasureSpec(int spec, int padding, int childDimension) { 4748 int specMode = MeasureSpec.getMode(spec); 4749 int specSize = MeasureSpec.getSize(spec); 4750 4751 int size = Math.max(0, specSize - padding); 4752 4753 int resultSize = 0; 4754 int resultMode = 0; 4755 4756 switch (specMode) { 4757 // Parent has imposed an exact size on us 4758 case MeasureSpec.EXACTLY: 4759 if (childDimension >= 0) { 4760 resultSize = childDimension; 4761 resultMode = MeasureSpec.EXACTLY; 4762 } else if (childDimension == LayoutParams.MATCH_PARENT) { 4763 // Child wants to be our size. So be it. 4764 resultSize = size; 4765 resultMode = MeasureSpec.EXACTLY; 4766 } else if (childDimension == LayoutParams.WRAP_CONTENT) { 4767 // Child wants to determine its own size. It can't be 4768 // bigger than us. 4769 resultSize = size; 4770 resultMode = MeasureSpec.AT_MOST; 4771 } 4772 break; 4773 4774 // Parent has imposed a maximum size on us 4775 case MeasureSpec.AT_MOST: 4776 if (childDimension >= 0) { 4777 // Child wants a specific size... so be it 4778 resultSize = childDimension; 4779 resultMode = MeasureSpec.EXACTLY; 4780 } else if (childDimension == LayoutParams.MATCH_PARENT) { 4781 // Child wants to be our size, but our size is not fixed. 4782 // Constrain child to not be bigger than us. 4783 resultSize = size; 4784 resultMode = MeasureSpec.AT_MOST; 4785 } else if (childDimension == LayoutParams.WRAP_CONTENT) { 4786 // Child wants to determine its own size. It can't be 4787 // bigger than us. 4788 resultSize = size; 4789 resultMode = MeasureSpec.AT_MOST; 4790 } 4791 break; 4792 4793 // Parent asked to see how big we want to be 4794 case MeasureSpec.UNSPECIFIED: 4795 if (childDimension >= 0) { 4796 // Child wants a specific size... let him have it 4797 resultSize = childDimension; 4798 resultMode = MeasureSpec.EXACTLY; 4799 } else if (childDimension == LayoutParams.MATCH_PARENT) { 4800 // Child wants to be our size... find out how big it should 4801 // be 4802 resultSize = 0; 4803 resultMode = MeasureSpec.UNSPECIFIED; 4804 } else if (childDimension == LayoutParams.WRAP_CONTENT) { 4805 // Child wants to determine its own size.... find out how 4806 // big it should be 4807 resultSize = 0; 4808 resultMode = MeasureSpec.UNSPECIFIED; 4809 } 4810 break; 4811 } 4812 return MeasureSpec.makeMeasureSpec(resultSize, resultMode); 4813 } 4814 4815 4816 /** 4817 * Removes any pending animations for views that have been removed. Call 4818 * this if you don't want animations for exiting views to stack up. 4819 */ 4820 public void clearDisappearingChildren() { 4821 if (mDisappearingChildren != null) { 4822 mDisappearingChildren.clear(); 4823 } 4824 } 4825 4826 /** 4827 * Add a view which is removed from mChildren but still needs animation 4828 * 4829 * @param v View to add 4830 */ 4831 private void addDisappearingView(View v) { 4832 ArrayList<View> disappearingChildren = mDisappearingChildren; 4833 4834 if (disappearingChildren == null) { 4835 disappearingChildren = mDisappearingChildren = new ArrayList<View>(); 4836 } 4837 4838 disappearingChildren.add(v); 4839 } 4840 4841 /** 4842 * Cleanup a view when its animation is done. This may mean removing it from 4843 * the list of disappearing views. 4844 * 4845 * @param view The view whose animation has finished 4846 * @param animation The animation, cannot be null 4847 */ 4848 private void finishAnimatingView(final View view, Animation animation) { 4849 final ArrayList<View> disappearingChildren = mDisappearingChildren; 4850 if (disappearingChildren != null) { 4851 if (disappearingChildren.contains(view)) { 4852 disappearingChildren.remove(view); 4853 4854 if (view.mAttachInfo != null) { 4855 view.dispatchDetachedFromWindow(); 4856 } 4857 4858 view.clearAnimation(); 4859 mGroupFlags |= FLAG_INVALIDATE_REQUIRED; 4860 } 4861 } 4862 4863 if (animation != null && !animation.getFillAfter()) { 4864 view.clearAnimation(); 4865 } 4866 4867 if ((view.mPrivateFlags & ANIMATION_STARTED) == ANIMATION_STARTED) { 4868 view.onAnimationEnd(); 4869 // Should be performed by onAnimationEnd() but this avoid an infinite loop, 4870 // so we'd rather be safe than sorry 4871 view.mPrivateFlags &= ~ANIMATION_STARTED; 4872 // Draw one more frame after the animation is done 4873 mGroupFlags |= FLAG_INVALIDATE_REQUIRED; 4874 } 4875 } 4876 4877 /** 4878 * Utility function called by View during invalidation to determine whether a view that 4879 * is invisible or gone should still be invalidated because it is being transitioned (and 4880 * therefore still needs to be drawn). 4881 */ 4882 boolean isViewTransitioning(View view) { 4883 return (mTransitioningViews != null && mTransitioningViews.contains(view)); 4884 } 4885 4886 /** 4887 * This method tells the ViewGroup that the given View object, which should have this 4888 * ViewGroup as its parent, 4889 * should be kept around (re-displayed when the ViewGroup draws its children) even if it 4890 * is removed from its parent. This allows animations, such as those used by 4891 * {@link android.app.Fragment} and {@link android.animation.LayoutTransition} to animate 4892 * the removal of views. A call to this method should always be accompanied by a later call 4893 * to {@link #endViewTransition(View)}, such as after an animation on the View has finished, 4894 * so that the View finally gets removed. 4895 * 4896 * @param view The View object to be kept visible even if it gets removed from its parent. 4897 */ 4898 public void startViewTransition(View view) { 4899 if (view.mParent == this) { 4900 if (mTransitioningViews == null) { 4901 mTransitioningViews = new ArrayList<View>(); 4902 } 4903 mTransitioningViews.add(view); 4904 } 4905 } 4906 4907 /** 4908 * This method should always be called following an earlier call to 4909 * {@link #startViewTransition(View)}. The given View is finally removed from its parent 4910 * and will no longer be displayed. Note that this method does not perform the functionality 4911 * of removing a view from its parent; it just discontinues the display of a View that 4912 * has previously been removed. 4913 * 4914 * @return view The View object that has been removed but is being kept around in the visible 4915 * hierarchy by an earlier call to {@link #startViewTransition(View)}. 4916 */ 4917 public void endViewTransition(View view) { 4918 if (mTransitioningViews != null) { 4919 mTransitioningViews.remove(view); 4920 final ArrayList<View> disappearingChildren = mDisappearingChildren; 4921 if (disappearingChildren != null && disappearingChildren.contains(view)) { 4922 disappearingChildren.remove(view); 4923 if (mVisibilityChangingChildren != null && 4924 mVisibilityChangingChildren.contains(view)) { 4925 mVisibilityChangingChildren.remove(view); 4926 } else { 4927 if (view.mAttachInfo != null) { 4928 view.dispatchDetachedFromWindow(); 4929 } 4930 if (view.mParent != null) { 4931 view.mParent = null; 4932 } 4933 } 4934 mGroupFlags |= FLAG_INVALIDATE_REQUIRED; 4935 } 4936 } 4937 } 4938 4939 private LayoutTransition.TransitionListener mLayoutTransitionListener = 4940 new LayoutTransition.TransitionListener() { 4941 @Override 4942 public void startTransition(LayoutTransition transition, ViewGroup container, 4943 View view, int transitionType) { 4944 // We only care about disappearing items, since we need special logic to keep 4945 // those items visible after they've been 'removed' 4946 if (transitionType == LayoutTransition.DISAPPEARING) { 4947 startViewTransition(view); 4948 } 4949 } 4950 4951 @Override 4952 public void endTransition(LayoutTransition transition, ViewGroup container, 4953 View view, int transitionType) { 4954 if (mLayoutSuppressed && !transition.isChangingLayout()) { 4955 requestLayout(); 4956 mLayoutSuppressed = false; 4957 } 4958 if (transitionType == LayoutTransition.DISAPPEARING && mTransitioningViews != null) { 4959 endViewTransition(view); 4960 } 4961 } 4962 }; 4963 4964 /** 4965 * {@inheritDoc} 4966 */ 4967 @Override 4968 public boolean gatherTransparentRegion(Region region) { 4969 // If no transparent regions requested, we are always opaque. 4970 final boolean meOpaque = (mPrivateFlags & View.REQUEST_TRANSPARENT_REGIONS) == 0; 4971 if (meOpaque && region == null) { 4972 // The caller doesn't care about the region, so stop now. 4973 return true; 4974 } 4975 super.gatherTransparentRegion(region); 4976 final View[] children = mChildren; 4977 final int count = mChildrenCount; 4978 boolean noneOfTheChildrenAreTransparent = true; 4979 for (int i = 0; i < count; i++) { 4980 final View child = children[i]; 4981 if ((child.mViewFlags & VISIBILITY_MASK) == VISIBLE || child.getAnimation() != null) { 4982 if (!child.gatherTransparentRegion(region)) { 4983 noneOfTheChildrenAreTransparent = false; 4984 } 4985 } 4986 } 4987 return meOpaque || noneOfTheChildrenAreTransparent; 4988 } 4989 4990 /** 4991 * {@inheritDoc} 4992 */ 4993 public void requestTransparentRegion(View child) { 4994 if (child != null) { 4995 child.mPrivateFlags |= View.REQUEST_TRANSPARENT_REGIONS; 4996 if (mParent != null) { 4997 mParent.requestTransparentRegion(this); 4998 } 4999 } 5000 } 5001 5002 5003 @Override 5004 protected boolean fitSystemWindows(Rect insets) { 5005 boolean done = super.fitSystemWindows(insets); 5006 if (!done) { 5007 final int count = mChildrenCount; 5008 final View[] children = mChildren; 5009 for (int i = 0; i < count; i++) { 5010 done = children[i].fitSystemWindows(insets); 5011 if (done) { 5012 break; 5013 } 5014 } 5015 } 5016 return done; 5017 } 5018 5019 /** 5020 * Returns the animation listener to which layout animation events are 5021 * sent. 5022 * 5023 * @return an {@link android.view.animation.Animation.AnimationListener} 5024 */ 5025 public Animation.AnimationListener getLayoutAnimationListener() { 5026 return mAnimationListener; 5027 } 5028 5029 @Override 5030 protected void drawableStateChanged() { 5031 super.drawableStateChanged(); 5032 5033 if ((mGroupFlags & FLAG_NOTIFY_CHILDREN_ON_DRAWABLE_STATE_CHANGE) != 0) { 5034 if ((mGroupFlags & FLAG_ADD_STATES_FROM_CHILDREN) != 0) { 5035 throw new IllegalStateException("addStateFromChildren cannot be enabled if a" 5036 + " child has duplicateParentState set to true"); 5037 } 5038 5039 final View[] children = mChildren; 5040 final int count = mChildrenCount; 5041 5042 for (int i = 0; i < count; i++) { 5043 final View child = children[i]; 5044 if ((child.mViewFlags & DUPLICATE_PARENT_STATE) != 0) { 5045 child.refreshDrawableState(); 5046 } 5047 } 5048 } 5049 } 5050 5051 @Override 5052 public void jumpDrawablesToCurrentState() { 5053 super.jumpDrawablesToCurrentState(); 5054 final View[] children = mChildren; 5055 final int count = mChildrenCount; 5056 for (int i = 0; i < count; i++) { 5057 children[i].jumpDrawablesToCurrentState(); 5058 } 5059 } 5060 5061 @Override 5062 protected int[] onCreateDrawableState(int extraSpace) { 5063 if ((mGroupFlags & FLAG_ADD_STATES_FROM_CHILDREN) == 0) { 5064 return super.onCreateDrawableState(extraSpace); 5065 } 5066 5067 int need = 0; 5068 int n = getChildCount(); 5069 for (int i = 0; i < n; i++) { 5070 int[] childState = getChildAt(i).getDrawableState(); 5071 5072 if (childState != null) { 5073 need += childState.length; 5074 } 5075 } 5076 5077 int[] state = super.onCreateDrawableState(extraSpace + need); 5078 5079 for (int i = 0; i < n; i++) { 5080 int[] childState = getChildAt(i).getDrawableState(); 5081 5082 if (childState != null) { 5083 state = mergeDrawableStates(state, childState); 5084 } 5085 } 5086 5087 return state; 5088 } 5089 5090 /** 5091 * Sets whether this ViewGroup's drawable states also include 5092 * its children's drawable states. This is used, for example, to 5093 * make a group appear to be focused when its child EditText or button 5094 * is focused. 5095 */ 5096 public void setAddStatesFromChildren(boolean addsStates) { 5097 if (addsStates) { 5098 mGroupFlags |= FLAG_ADD_STATES_FROM_CHILDREN; 5099 } else { 5100 mGroupFlags &= ~FLAG_ADD_STATES_FROM_CHILDREN; 5101 } 5102 5103 refreshDrawableState(); 5104 } 5105 5106 /** 5107 * Returns whether this ViewGroup's drawable states also include 5108 * its children's drawable states. This is used, for example, to 5109 * make a group appear to be focused when its child EditText or button 5110 * is focused. 5111 */ 5112 public boolean addStatesFromChildren() { 5113 return (mGroupFlags & FLAG_ADD_STATES_FROM_CHILDREN) != 0; 5114 } 5115 5116 /** 5117 * If {link #addStatesFromChildren} is true, refreshes this group's 5118 * drawable state (to include the states from its children). 5119 */ 5120 public void childDrawableStateChanged(View child) { 5121 if ((mGroupFlags & FLAG_ADD_STATES_FROM_CHILDREN) != 0) { 5122 refreshDrawableState(); 5123 } 5124 } 5125 5126 /** 5127 * Specifies the animation listener to which layout animation events must 5128 * be sent. Only 5129 * {@link android.view.animation.Animation.AnimationListener#onAnimationStart(Animation)} 5130 * and 5131 * {@link android.view.animation.Animation.AnimationListener#onAnimationEnd(Animation)} 5132 * are invoked. 5133 * 5134 * @param animationListener the layout animation listener 5135 */ 5136 public void setLayoutAnimationListener(Animation.AnimationListener animationListener) { 5137 mAnimationListener = animationListener; 5138 } 5139 5140 /** 5141 * This method is called by LayoutTransition when there are 'changing' animations that need 5142 * to start after the layout/setup phase. The request is forwarded to the ViewAncestor, who 5143 * starts all pending transitions prior to the drawing phase in the current traversal. 5144 * 5145 * @param transition The LayoutTransition to be started on the next traversal. 5146 * 5147 * @hide 5148 */ 5149 public void requestTransitionStart(LayoutTransition transition) { 5150 ViewRootImpl viewAncestor = getViewRootImpl(); 5151 if (viewAncestor != null) { 5152 viewAncestor.requestTransitionStart(transition); 5153 } 5154 } 5155 5156 @Override 5157 protected void resetResolvedLayoutDirection() { 5158 super.resetResolvedLayoutDirection(); 5159 5160 // Take care of resetting the children resolution too 5161 final int count = getChildCount(); 5162 for (int i = 0; i < count; i++) { 5163 final View child = getChildAt(i); 5164 if (child.getLayoutDirection() == LAYOUT_DIRECTION_INHERIT) { 5165 child.resetResolvedLayoutDirection(); 5166 } 5167 } 5168 } 5169 5170 @Override 5171 protected void resetResolvedTextDirection() { 5172 super.resetResolvedTextDirection(); 5173 5174 // Take care of resetting the children resolution too 5175 final int count = getChildCount(); 5176 for (int i = 0; i < count; i++) { 5177 final View child = getChildAt(i); 5178 if (child.getTextDirection() == TEXT_DIRECTION_INHERIT) { 5179 child.resetResolvedTextDirection(); 5180 } 5181 } 5182 } 5183 5184 /** 5185 * Return true if the pressed state should be delayed for children or descendants of this 5186 * ViewGroup. Generally, this should be done for containers that can scroll, such as a List. 5187 * This prevents the pressed state from appearing when the user is actually trying to scroll 5188 * the content. 5189 * 5190 * The default implementation returns true for compatibility reasons. Subclasses that do 5191 * not scroll should generally override this method and return false. 5192 */ 5193 public boolean shouldDelayChildPressedState() { 5194 return true; 5195 } 5196 5197 /** 5198 * LayoutParams are used by views to tell their parents how they want to be 5199 * laid out. See 5200 * {@link android.R.styleable#ViewGroup_Layout ViewGroup Layout Attributes} 5201 * for a list of all child view attributes that this class supports. 5202 * 5203 * <p> 5204 * The base LayoutParams class just describes how big the view wants to be 5205 * for both width and height. For each dimension, it can specify one of: 5206 * <ul> 5207 * <li>FILL_PARENT (renamed MATCH_PARENT in API Level 8 and higher), which 5208 * means that the view wants to be as big as its parent (minus padding) 5209 * <li> WRAP_CONTENT, which means that the view wants to be just big enough 5210 * to enclose its content (plus padding) 5211 * <li> an exact number 5212 * </ul> 5213 * There are subclasses of LayoutParams for different subclasses of 5214 * ViewGroup. For example, AbsoluteLayout has its own subclass of 5215 * LayoutParams which adds an X and Y value.</p> 5216 * 5217 * <div class="special reference"> 5218 * <h3>Developer Guides</h3> 5219 * <p>For more information about creating user interface layouts, read the 5220 * <a href="{@docRoot}guide/topics/ui/declaring-layout.html">XML Layouts</a> developer 5221 * guide.</p></div> 5222 * 5223 * @attr ref android.R.styleable#ViewGroup_Layout_layout_height 5224 * @attr ref android.R.styleable#ViewGroup_Layout_layout_width 5225 */ 5226 public static class LayoutParams { 5227 /** 5228 * Special value for the height or width requested by a View. 5229 * FILL_PARENT means that the view wants to be as big as its parent, 5230 * minus the parent's padding, if any. This value is deprecated 5231 * starting in API Level 8 and replaced by {@link #MATCH_PARENT}. 5232 */ 5233 @SuppressWarnings({"UnusedDeclaration"}) 5234 @Deprecated 5235 public static final int FILL_PARENT = -1; 5236 5237 /** 5238 * Special value for the height or width requested by a View. 5239 * MATCH_PARENT means that the view wants to be as big as its parent, 5240 * minus the parent's padding, if any. Introduced in API Level 8. 5241 */ 5242 public static final int MATCH_PARENT = -1; 5243 5244 /** 5245 * Special value for the height or width requested by a View. 5246 * WRAP_CONTENT means that the view wants to be just large enough to fit 5247 * its own internal content, taking its own padding into account. 5248 */ 5249 public static final int WRAP_CONTENT = -2; 5250 5251 /** 5252 * Information about how wide the view wants to be. Can be one of the 5253 * constants FILL_PARENT (replaced by MATCH_PARENT , 5254 * in API Level 8) or WRAP_CONTENT. or an exact size. 5255 */ 5256 @ViewDebug.ExportedProperty(category = "layout", mapping = { 5257 @ViewDebug.IntToString(from = MATCH_PARENT, to = "MATCH_PARENT"), 5258 @ViewDebug.IntToString(from = WRAP_CONTENT, to = "WRAP_CONTENT") 5259 }) 5260 public int width; 5261 5262 /** 5263 * Information about how tall the view wants to be. Can be one of the 5264 * constants FILL_PARENT (replaced by MATCH_PARENT , 5265 * in API Level 8) or WRAP_CONTENT. or an exact size. 5266 */ 5267 @ViewDebug.ExportedProperty(category = "layout", mapping = { 5268 @ViewDebug.IntToString(from = MATCH_PARENT, to = "MATCH_PARENT"), 5269 @ViewDebug.IntToString(from = WRAP_CONTENT, to = "WRAP_CONTENT") 5270 }) 5271 public int height; 5272 5273 /** 5274 * Used to animate layouts. 5275 */ 5276 public LayoutAnimationController.AnimationParameters layoutAnimationParameters; 5277 5278 /** 5279 * Creates a new set of layout parameters. The values are extracted from 5280 * the supplied attributes set and context. The XML attributes mapped 5281 * to this set of layout parameters are: 5282 * 5283 * <ul> 5284 * <li><code>layout_width</code>: the width, either an exact value, 5285 * {@link #WRAP_CONTENT}, or {@link #FILL_PARENT} (replaced by 5286 * {@link #MATCH_PARENT} in API Level 8)</li> 5287 * <li><code>layout_height</code>: the height, either an exact value, 5288 * {@link #WRAP_CONTENT}, or {@link #FILL_PARENT} (replaced by 5289 * {@link #MATCH_PARENT} in API Level 8)</li> 5290 * </ul> 5291 * 5292 * @param c the application environment 5293 * @param attrs the set of attributes from which to extract the layout 5294 * parameters' values 5295 */ 5296 public LayoutParams(Context c, AttributeSet attrs) { 5297 TypedArray a = c.obtainStyledAttributes(attrs, R.styleable.ViewGroup_Layout); 5298 setBaseAttributes(a, 5299 R.styleable.ViewGroup_Layout_layout_width, 5300 R.styleable.ViewGroup_Layout_layout_height); 5301 a.recycle(); 5302 } 5303 5304 /** 5305 * Creates a new set of layout parameters with the specified width 5306 * and height. 5307 * 5308 * @param width the width, either {@link #WRAP_CONTENT}, 5309 * {@link #FILL_PARENT} (replaced by {@link #MATCH_PARENT} in 5310 * API Level 8), or a fixed size in pixels 5311 * @param height the height, either {@link #WRAP_CONTENT}, 5312 * {@link #FILL_PARENT} (replaced by {@link #MATCH_PARENT} in 5313 * API Level 8), or a fixed size in pixels 5314 */ 5315 public LayoutParams(int width, int height) { 5316 this.width = width; 5317 this.height = height; 5318 } 5319 5320 /** 5321 * Copy constructor. Clones the width and height values of the source. 5322 * 5323 * @param source The layout params to copy from. 5324 */ 5325 public LayoutParams(LayoutParams source) { 5326 this.width = source.width; 5327 this.height = source.height; 5328 } 5329 5330 /** 5331 * Used internally by MarginLayoutParams. 5332 * @hide 5333 */ 5334 LayoutParams() { 5335 } 5336 5337 /** 5338 * Extracts the layout parameters from the supplied attributes. 5339 * 5340 * @param a the style attributes to extract the parameters from 5341 * @param widthAttr the identifier of the width attribute 5342 * @param heightAttr the identifier of the height attribute 5343 */ 5344 protected void setBaseAttributes(TypedArray a, int widthAttr, int heightAttr) { 5345 width = a.getLayoutDimension(widthAttr, "layout_width"); 5346 height = a.getLayoutDimension(heightAttr, "layout_height"); 5347 } 5348 5349 /** 5350 * Resolve layout parameters depending on the layout direction. Subclasses that care about 5351 * layoutDirection changes should override this method. The default implementation does 5352 * nothing. 5353 * 5354 * @param layoutDirection the direction of the layout 5355 * 5356 * {@link View#LAYOUT_DIRECTION_LTR} 5357 * {@link View#LAYOUT_DIRECTION_RTL} 5358 * 5359 * @hide 5360 */ 5361 protected void resolveWithDirection(int layoutDirection) { 5362 } 5363 5364 /** 5365 * Returns a String representation of this set of layout parameters. 5366 * 5367 * @param output the String to prepend to the internal representation 5368 * @return a String with the following format: output + 5369 * "ViewGroup.LayoutParams={ width=WIDTH, height=HEIGHT }" 5370 * 5371 * @hide 5372 */ 5373 public String debug(String output) { 5374 return output + "ViewGroup.LayoutParams={ width=" 5375 + sizeToString(width) + ", height=" + sizeToString(height) + " }"; 5376 } 5377 5378 /** 5379 * Converts the specified size to a readable String. 5380 * 5381 * @param size the size to convert 5382 * @return a String instance representing the supplied size 5383 * 5384 * @hide 5385 */ 5386 protected static String sizeToString(int size) { 5387 if (size == WRAP_CONTENT) { 5388 return "wrap-content"; 5389 } 5390 if (size == MATCH_PARENT) { 5391 return "match-parent"; 5392 } 5393 return String.valueOf(size); 5394 } 5395 } 5396 5397 /** 5398 * Per-child layout information for layouts that support margins. 5399 * See 5400 * {@link android.R.styleable#ViewGroup_MarginLayout ViewGroup Margin Layout Attributes} 5401 * for a list of all child view attributes that this class supports. 5402 */ 5403 public static class MarginLayoutParams extends ViewGroup.LayoutParams { 5404 /** 5405 * The left margin in pixels of the child. Whenever this value is changed, a call to 5406 * {@link android.view.View#requestLayout()} needs to be done. 5407 */ 5408 @ViewDebug.ExportedProperty(category = "layout") 5409 public int leftMargin; 5410 5411 /** 5412 * The top margin in pixels of the child. Whenever this value is changed, a call to 5413 * {@link android.view.View#requestLayout()} needs to be done. 5414 */ 5415 @ViewDebug.ExportedProperty(category = "layout") 5416 public int topMargin; 5417 5418 /** 5419 * The right margin in pixels of the child. Whenever this value is changed, a call to 5420 * {@link android.view.View#requestLayout()} needs to be done. 5421 */ 5422 @ViewDebug.ExportedProperty(category = "layout") 5423 public int rightMargin; 5424 5425 /** 5426 * The bottom margin in pixels of the child. Whenever this value is changed, a call to 5427 * {@link android.view.View#requestLayout()} needs to be done. 5428 */ 5429 @ViewDebug.ExportedProperty(category = "layout") 5430 public int bottomMargin; 5431 5432 /** 5433 * The start margin in pixels of the child. 5434 * 5435 * @hide 5436 * 5437 */ 5438 @ViewDebug.ExportedProperty(category = "layout") 5439 protected int startMargin = DEFAULT_RELATIVE; 5440 5441 /** 5442 * The end margin in pixels of the child. 5443 * 5444 * @hide 5445 */ 5446 @ViewDebug.ExportedProperty(category = "layout") 5447 protected int endMargin = DEFAULT_RELATIVE; 5448 5449 /** 5450 * The default start and end margin. 5451 */ 5452 static private final int DEFAULT_RELATIVE = Integer.MIN_VALUE; 5453 5454 /** 5455 * Creates a new set of layout parameters. The values are extracted from 5456 * the supplied attributes set and context. 5457 * 5458 * @param c the application environment 5459 * @param attrs the set of attributes from which to extract the layout 5460 * parameters' values 5461 */ 5462 public MarginLayoutParams(Context c, AttributeSet attrs) { 5463 super(); 5464 5465 TypedArray a = c.obtainStyledAttributes(attrs, R.styleable.ViewGroup_MarginLayout); 5466 setBaseAttributes(a, 5467 R.styleable.ViewGroup_MarginLayout_layout_width, 5468 R.styleable.ViewGroup_MarginLayout_layout_height); 5469 5470 int margin = a.getDimensionPixelSize( 5471 com.android.internal.R.styleable.ViewGroup_MarginLayout_layout_margin, -1); 5472 if (margin >= 0) { 5473 leftMargin = margin; 5474 topMargin = margin; 5475 rightMargin= margin; 5476 bottomMargin = margin; 5477 } else { 5478 leftMargin = a.getDimensionPixelSize( 5479 R.styleable.ViewGroup_MarginLayout_layout_marginLeft, 0); 5480 topMargin = a.getDimensionPixelSize( 5481 R.styleable.ViewGroup_MarginLayout_layout_marginTop, 0); 5482 rightMargin = a.getDimensionPixelSize( 5483 R.styleable.ViewGroup_MarginLayout_layout_marginRight, 0); 5484 bottomMargin = a.getDimensionPixelSize( 5485 R.styleable.ViewGroup_MarginLayout_layout_marginBottom, 0); 5486 startMargin = a.getDimensionPixelSize( 5487 R.styleable.ViewGroup_MarginLayout_layout_marginStart, DEFAULT_RELATIVE); 5488 endMargin = a.getDimensionPixelSize( 5489 R.styleable.ViewGroup_MarginLayout_layout_marginEnd, DEFAULT_RELATIVE); 5490 } 5491 5492 a.recycle(); 5493 } 5494 5495 /** 5496 * {@inheritDoc} 5497 */ 5498 public MarginLayoutParams(int width, int height) { 5499 super(width, height); 5500 } 5501 5502 /** 5503 * Copy constructor. Clones the width, height and margin values of the source. 5504 * 5505 * @param source The layout params to copy from. 5506 */ 5507 public MarginLayoutParams(MarginLayoutParams source) { 5508 this.width = source.width; 5509 this.height = source.height; 5510 5511 this.leftMargin = source.leftMargin; 5512 this.topMargin = source.topMargin; 5513 this.rightMargin = source.rightMargin; 5514 this.bottomMargin = source.bottomMargin; 5515 this.startMargin = source.startMargin; 5516 this.endMargin = source.endMargin; 5517 } 5518 5519 /** 5520 * {@inheritDoc} 5521 */ 5522 public MarginLayoutParams(LayoutParams source) { 5523 super(source); 5524 } 5525 5526 /** 5527 * Sets the margins, in pixels. A call to {@link android.view.View#requestLayout()} needs 5528 * to be done so that the new margins are taken into account. Left and right margins may be 5529 * overriden by {@link android.view.View#requestLayout()} depending on layout direction. 5530 * 5531 * @param left the left margin size 5532 * @param top the top margin size 5533 * @param right the right margin size 5534 * @param bottom the bottom margin size 5535 * 5536 * @attr ref android.R.styleable#ViewGroup_MarginLayout_layout_marginLeft 5537 * @attr ref android.R.styleable#ViewGroup_MarginLayout_layout_marginTop 5538 * @attr ref android.R.styleable#ViewGroup_MarginLayout_layout_marginRight 5539 * @attr ref android.R.styleable#ViewGroup_MarginLayout_layout_marginBottom 5540 */ 5541 public void setMargins(int left, int top, int right, int bottom) { 5542 leftMargin = left; 5543 topMargin = top; 5544 rightMargin = right; 5545 bottomMargin = bottom; 5546 } 5547 5548 /** 5549 * Sets the relative margins, in pixels. A call to {@link android.view.View#requestLayout()} 5550 * needs to be done so that the new relative margins are taken into account. Left and right 5551 * margins may be overriden by {@link android.view.View#requestLayout()} depending on layout 5552 * direction. 5553 * 5554 * @param start the start margin size 5555 * @param top the top margin size 5556 * @param end the right margin size 5557 * @param bottom the bottom margin size 5558 * 5559 * @attr ref android.R.styleable#ViewGroup_MarginLayout_layout_marginStart 5560 * @attr ref android.R.styleable#ViewGroup_MarginLayout_layout_marginTop 5561 * @attr ref android.R.styleable#ViewGroup_MarginLayout_layout_marginEnd 5562 * @attr ref android.R.styleable#ViewGroup_MarginLayout_layout_marginBottom 5563 * 5564 * @hide 5565 */ 5566 public void setMarginsRelative(int start, int top, int end, int bottom) { 5567 startMargin = start; 5568 topMargin = top; 5569 endMargin = end; 5570 bottomMargin = bottom; 5571 } 5572 5573 /** 5574 * Returns the start margin in pixels. 5575 * 5576 * @attr ref android.R.styleable#ViewGroup_MarginLayout_layout_marginStart 5577 * 5578 * @return the start margin in pixels. 5579 * 5580 * @hide 5581 */ 5582 public int getMarginStart() { 5583 return startMargin; 5584 } 5585 5586 /** 5587 * Returns the end margin in pixels. 5588 * 5589 * @attr ref android.R.styleable#ViewGroup_MarginLayout_layout_marginEnd 5590 * 5591 * @return the end margin in pixels. 5592 * 5593 * @hide 5594 */ 5595 public int getMarginEnd() { 5596 return endMargin; 5597 } 5598 5599 /** 5600 * Check if margins are relative. 5601 * 5602 * @attr ref android.R.styleable#ViewGroup_MarginLayout_layout_marginStart 5603 * @attr ref android.R.styleable#ViewGroup_MarginLayout_layout_marginEnd 5604 * 5605 * @return true if either marginStart or marginEnd has been set 5606 * 5607 * @hide 5608 */ 5609 public boolean isMarginRelative() { 5610 return (startMargin != DEFAULT_RELATIVE) || (endMargin != DEFAULT_RELATIVE); 5611 } 5612 5613 /** 5614 * This will be called by {@link android.view.View#requestLayout()}. Left and Right margins 5615 * maybe overriden depending on layout direction. 5616 * 5617 * @hide 5618 */ 5619 @Override 5620 protected void resolveWithDirection(int layoutDirection) { 5621 switch(layoutDirection) { 5622 case View.LAYOUT_DIRECTION_RTL: 5623 leftMargin = (endMargin > DEFAULT_RELATIVE) ? endMargin : leftMargin; 5624 rightMargin = (startMargin > DEFAULT_RELATIVE) ? startMargin : rightMargin; 5625 break; 5626 case View.LAYOUT_DIRECTION_LTR: 5627 default: 5628 leftMargin = (startMargin > DEFAULT_RELATIVE) ? startMargin : leftMargin; 5629 rightMargin = (endMargin > DEFAULT_RELATIVE) ? endMargin : rightMargin; 5630 break; 5631 } 5632 } 5633 } 5634 5635 /* Describes a touched view and the ids of the pointers that it has captured. 5636 * 5637 * This code assumes that pointer ids are always in the range 0..31 such that 5638 * it can use a bitfield to track which pointer ids are present. 5639 * As it happens, the lower layers of the input dispatch pipeline also use the 5640 * same trick so the assumption should be safe here... 5641 */ 5642 private static final class TouchTarget { 5643 private static final int MAX_RECYCLED = 32; 5644 private static final Object sRecycleLock = new Object(); 5645 private static TouchTarget sRecycleBin; 5646 private static int sRecycledCount; 5647 5648 public static final int ALL_POINTER_IDS = -1; // all ones 5649 5650 // The touched child view. 5651 public View child; 5652 5653 // The combined bit mask of pointer ids for all pointers captured by the target. 5654 public int pointerIdBits; 5655 5656 // The next target in the target list. 5657 public TouchTarget next; 5658 5659 private TouchTarget() { 5660 } 5661 5662 public static TouchTarget obtain(View child, int pointerIdBits) { 5663 final TouchTarget target; 5664 synchronized (sRecycleLock) { 5665 if (sRecycleBin == null) { 5666 target = new TouchTarget(); 5667 } else { 5668 target = sRecycleBin; 5669 sRecycleBin = target.next; 5670 sRecycledCount--; 5671 target.next = null; 5672 } 5673 } 5674 target.child = child; 5675 target.pointerIdBits = pointerIdBits; 5676 return target; 5677 } 5678 5679 public void recycle() { 5680 synchronized (sRecycleLock) { 5681 if (sRecycledCount < MAX_RECYCLED) { 5682 next = sRecycleBin; 5683 sRecycleBin = this; 5684 sRecycledCount += 1; 5685 } else { 5686 next = null; 5687 } 5688 child = null; 5689 } 5690 } 5691 } 5692 5693 /* Describes a hovered view. */ 5694 private static final class HoverTarget { 5695 private static final int MAX_RECYCLED = 32; 5696 private static final Object sRecycleLock = new Object(); 5697 private static HoverTarget sRecycleBin; 5698 private static int sRecycledCount; 5699 5700 // The hovered child view. 5701 public View child; 5702 5703 // The next target in the target list. 5704 public HoverTarget next; 5705 5706 private HoverTarget() { 5707 } 5708 5709 public static HoverTarget obtain(View child) { 5710 final HoverTarget target; 5711 synchronized (sRecycleLock) { 5712 if (sRecycleBin == null) { 5713 target = new HoverTarget(); 5714 } else { 5715 target = sRecycleBin; 5716 sRecycleBin = target.next; 5717 sRecycledCount--; 5718 target.next = null; 5719 } 5720 } 5721 target.child = child; 5722 return target; 5723 } 5724 5725 public void recycle() { 5726 synchronized (sRecycleLock) { 5727 if (sRecycledCount < MAX_RECYCLED) { 5728 next = sRecycleBin; 5729 sRecycleBin = this; 5730 sRecycledCount += 1; 5731 } else { 5732 next = null; 5733 } 5734 child = null; 5735 } 5736 } 5737 } 5738} 5739