ViewGroup.java revision 57f3b566db630233087b121d3d43ecd81a6dfd95
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 final Paint mCachePaint = new Paint(); 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 mCachePaint.setDither(false); 409 410 mPersistentDrawingCache = PERSISTENT_SCROLLING_CACHE; 411 } 412 413 private void initFromAttributes(Context context, AttributeSet attrs) { 414 TypedArray a = context.obtainStyledAttributes(attrs, 415 R.styleable.ViewGroup); 416 417 final int N = a.getIndexCount(); 418 for (int i = 0; i < N; i++) { 419 int attr = a.getIndex(i); 420 switch (attr) { 421 case R.styleable.ViewGroup_clipChildren: 422 setClipChildren(a.getBoolean(attr, true)); 423 break; 424 case R.styleable.ViewGroup_clipToPadding: 425 setClipToPadding(a.getBoolean(attr, true)); 426 break; 427 case R.styleable.ViewGroup_animationCache: 428 setAnimationCacheEnabled(a.getBoolean(attr, true)); 429 break; 430 case R.styleable.ViewGroup_persistentDrawingCache: 431 setPersistentDrawingCache(a.getInt(attr, PERSISTENT_SCROLLING_CACHE)); 432 break; 433 case R.styleable.ViewGroup_addStatesFromChildren: 434 setAddStatesFromChildren(a.getBoolean(attr, false)); 435 break; 436 case R.styleable.ViewGroup_alwaysDrawnWithCache: 437 setAlwaysDrawnWithCacheEnabled(a.getBoolean(attr, true)); 438 break; 439 case R.styleable.ViewGroup_layoutAnimation: 440 int id = a.getResourceId(attr, -1); 441 if (id > 0) { 442 setLayoutAnimation(AnimationUtils.loadLayoutAnimation(mContext, id)); 443 } 444 break; 445 case R.styleable.ViewGroup_descendantFocusability: 446 setDescendantFocusability(DESCENDANT_FOCUSABILITY_FLAGS[a.getInt(attr, 0)]); 447 break; 448 case R.styleable.ViewGroup_splitMotionEvents: 449 setMotionEventSplittingEnabled(a.getBoolean(attr, false)); 450 break; 451 case R.styleable.ViewGroup_animateLayoutChanges: 452 boolean animateLayoutChanges = a.getBoolean(attr, false); 453 if (animateLayoutChanges) { 454 setLayoutTransition(new LayoutTransition()); 455 } 456 break; 457 } 458 } 459 460 a.recycle(); 461 } 462 463 /** 464 * Gets the descendant focusability of this view group. The descendant 465 * focusability defines the relationship between this view group and its 466 * descendants when looking for a view to take focus in 467 * {@link #requestFocus(int, android.graphics.Rect)}. 468 * 469 * @return one of {@link #FOCUS_BEFORE_DESCENDANTS}, {@link #FOCUS_AFTER_DESCENDANTS}, 470 * {@link #FOCUS_BLOCK_DESCENDANTS}. 471 */ 472 @ViewDebug.ExportedProperty(category = "focus", mapping = { 473 @ViewDebug.IntToString(from = FOCUS_BEFORE_DESCENDANTS, to = "FOCUS_BEFORE_DESCENDANTS"), 474 @ViewDebug.IntToString(from = FOCUS_AFTER_DESCENDANTS, to = "FOCUS_AFTER_DESCENDANTS"), 475 @ViewDebug.IntToString(from = FOCUS_BLOCK_DESCENDANTS, to = "FOCUS_BLOCK_DESCENDANTS") 476 }) 477 public int getDescendantFocusability() { 478 return mGroupFlags & FLAG_MASK_FOCUSABILITY; 479 } 480 481 /** 482 * Set the descendant focusability of this view group. This defines the relationship 483 * between this view group and its descendants when looking for a view to 484 * take focus in {@link #requestFocus(int, android.graphics.Rect)}. 485 * 486 * @param focusability one of {@link #FOCUS_BEFORE_DESCENDANTS}, {@link #FOCUS_AFTER_DESCENDANTS}, 487 * {@link #FOCUS_BLOCK_DESCENDANTS}. 488 */ 489 public void setDescendantFocusability(int focusability) { 490 switch (focusability) { 491 case FOCUS_BEFORE_DESCENDANTS: 492 case FOCUS_AFTER_DESCENDANTS: 493 case FOCUS_BLOCK_DESCENDANTS: 494 break; 495 default: 496 throw new IllegalArgumentException("must be one of FOCUS_BEFORE_DESCENDANTS, " 497 + "FOCUS_AFTER_DESCENDANTS, FOCUS_BLOCK_DESCENDANTS"); 498 } 499 mGroupFlags &= ~FLAG_MASK_FOCUSABILITY; 500 mGroupFlags |= (focusability & FLAG_MASK_FOCUSABILITY); 501 } 502 503 /** 504 * {@inheritDoc} 505 */ 506 @Override 507 void handleFocusGainInternal(int direction, Rect previouslyFocusedRect) { 508 if (mFocused != null) { 509 mFocused.unFocus(); 510 mFocused = null; 511 } 512 super.handleFocusGainInternal(direction, previouslyFocusedRect); 513 } 514 515 /** 516 * {@inheritDoc} 517 */ 518 public void requestChildFocus(View child, View focused) { 519 if (DBG) { 520 System.out.println(this + " requestChildFocus()"); 521 } 522 if (getDescendantFocusability() == FOCUS_BLOCK_DESCENDANTS) { 523 return; 524 } 525 526 // Unfocus us, if necessary 527 super.unFocus(); 528 529 // We had a previous notion of who had focus. Clear it. 530 if (mFocused != child) { 531 if (mFocused != null) { 532 mFocused.unFocus(); 533 } 534 535 mFocused = child; 536 } 537 if (mParent != null) { 538 mParent.requestChildFocus(this, focused); 539 } 540 } 541 542 /** 543 * {@inheritDoc} 544 */ 545 public void focusableViewAvailable(View v) { 546 if (mParent != null 547 // shortcut: don't report a new focusable view if we block our descendants from 548 // getting focus 549 && (getDescendantFocusability() != FOCUS_BLOCK_DESCENDANTS) 550 // shortcut: don't report a new focusable view if we already are focused 551 // (and we don't prefer our descendants) 552 // 553 // note: knowing that mFocused is non-null is not a good enough reason 554 // to break the traversal since in that case we'd actually have to find 555 // the focused view and make sure it wasn't FOCUS_AFTER_DESCENDANTS and 556 // an ancestor of v; this will get checked for at ViewAncestor 557 && !(isFocused() && getDescendantFocusability() != FOCUS_AFTER_DESCENDANTS)) { 558 mParent.focusableViewAvailable(v); 559 } 560 } 561 562 /** 563 * {@inheritDoc} 564 */ 565 public boolean showContextMenuForChild(View originalView) { 566 return mParent != null && mParent.showContextMenuForChild(originalView); 567 } 568 569 /** 570 * {@inheritDoc} 571 */ 572 public ActionMode startActionModeForChild(View originalView, ActionMode.Callback callback) { 573 return mParent != null ? mParent.startActionModeForChild(originalView, callback) : null; 574 } 575 576 /** 577 * Find the nearest view in the specified direction that wants to take 578 * focus. 579 * 580 * @param focused The view that currently has focus 581 * @param direction One of FOCUS_UP, FOCUS_DOWN, FOCUS_LEFT, and 582 * FOCUS_RIGHT, or 0 for not applicable. 583 */ 584 public View focusSearch(View focused, int direction) { 585 if (isRootNamespace()) { 586 // root namespace means we should consider ourselves the top of the 587 // tree for focus searching; otherwise we could be focus searching 588 // into other tabs. see LocalActivityManager and TabHost for more info 589 return FocusFinder.getInstance().findNextFocus(this, focused, direction); 590 } else if (mParent != null) { 591 return mParent.focusSearch(focused, direction); 592 } 593 return null; 594 } 595 596 /** 597 * {@inheritDoc} 598 */ 599 public boolean requestChildRectangleOnScreen(View child, Rect rectangle, boolean immediate) { 600 return false; 601 } 602 603 /** 604 * {@inheritDoc} 605 */ 606 public boolean requestSendAccessibilityEvent(View child, AccessibilityEvent event) { 607 ViewParent parent = getParent(); 608 if (parent == null) { 609 return false; 610 } 611 final boolean propagate = onRequestSendAccessibilityEvent(child, event); 612 //noinspection SimplifiableIfStatement 613 if (!propagate) { 614 return false; 615 } 616 return parent.requestSendAccessibilityEvent(this, event); 617 } 618 619 /** 620 * Called when a child has requested sending an {@link AccessibilityEvent} and 621 * gives an opportunity to its parent to augment the event. 622 * <p> 623 * If an {@link android.view.View.AccessibilityDelegate} has been specified via calling 624 * {@link android.view.View#setAccessibilityDelegate(android.view.View.AccessibilityDelegate)} its 625 * {@link android.view.View.AccessibilityDelegate#onRequestSendAccessibilityEvent(ViewGroup, View, AccessibilityEvent)} 626 * is responsible for handling this call. 627 * </p> 628 * 629 * @param child The child which requests sending the event. 630 * @param event The event to be sent. 631 * @return True if the event should be sent. 632 * 633 * @see #requestSendAccessibilityEvent(View, AccessibilityEvent) 634 */ 635 public boolean onRequestSendAccessibilityEvent(View child, AccessibilityEvent event) { 636 if (mAccessibilityDelegate != null) { 637 return mAccessibilityDelegate.onRequestSendAccessibilityEvent(this, child, event); 638 } else { 639 return onRequestSendAccessibilityEventInternal(child, event); 640 } 641 } 642 643 /** 644 * @see #onRequestSendAccessibilityEvent(View, AccessibilityEvent) 645 * 646 * Note: Called from the default {@link View.AccessibilityDelegate}. 647 */ 648 boolean onRequestSendAccessibilityEventInternal(View child, AccessibilityEvent event) { 649 return true; 650 } 651 652 /** 653 * {@inheritDoc} 654 */ 655 @Override 656 public boolean dispatchUnhandledMove(View focused, int direction) { 657 return mFocused != null && 658 mFocused.dispatchUnhandledMove(focused, direction); 659 } 660 661 /** 662 * {@inheritDoc} 663 */ 664 public void clearChildFocus(View child) { 665 if (DBG) { 666 System.out.println(this + " clearChildFocus()"); 667 } 668 669 mFocused = null; 670 if (mParent != null) { 671 mParent.clearChildFocus(this); 672 } 673 } 674 675 /** 676 * {@inheritDoc} 677 */ 678 @Override 679 public void clearFocus() { 680 super.clearFocus(); 681 682 // clear any child focus if it exists 683 if (mFocused != null) { 684 mFocused.clearFocus(); 685 } 686 } 687 688 /** 689 * {@inheritDoc} 690 */ 691 @Override 692 void unFocus() { 693 if (DBG) { 694 System.out.println(this + " unFocus()"); 695 } 696 697 super.unFocus(); 698 if (mFocused != null) { 699 mFocused.unFocus(); 700 } 701 mFocused = null; 702 } 703 704 /** 705 * Returns the focused child of this view, if any. The child may have focus 706 * or contain focus. 707 * 708 * @return the focused child or null. 709 */ 710 public View getFocusedChild() { 711 return mFocused; 712 } 713 714 /** 715 * Returns true if this view has or contains focus 716 * 717 * @return true if this view has or contains focus 718 */ 719 @Override 720 public boolean hasFocus() { 721 return (mPrivateFlags & FOCUSED) != 0 || mFocused != null; 722 } 723 724 /* 725 * (non-Javadoc) 726 * 727 * @see android.view.View#findFocus() 728 */ 729 @Override 730 public View findFocus() { 731 if (DBG) { 732 System.out.println("Find focus in " + this + ": flags=" 733 + isFocused() + ", child=" + mFocused); 734 } 735 736 if (isFocused()) { 737 return this; 738 } 739 740 if (mFocused != null) { 741 return mFocused.findFocus(); 742 } 743 return null; 744 } 745 746 /** 747 * {@inheritDoc} 748 */ 749 @Override 750 public boolean hasFocusable() { 751 if ((mViewFlags & VISIBILITY_MASK) != VISIBLE) { 752 return false; 753 } 754 755 if (isFocusable()) { 756 return true; 757 } 758 759 final int descendantFocusability = getDescendantFocusability(); 760 if (descendantFocusability != FOCUS_BLOCK_DESCENDANTS) { 761 final int count = mChildrenCount; 762 final View[] children = mChildren; 763 764 for (int i = 0; i < count; i++) { 765 final View child = children[i]; 766 if (child.hasFocusable()) { 767 return true; 768 } 769 } 770 } 771 772 return false; 773 } 774 775 /** 776 * {@inheritDoc} 777 */ 778 @Override 779 public void addFocusables(ArrayList<View> views, int direction) { 780 addFocusables(views, direction, FOCUSABLES_TOUCH_MODE); 781 } 782 783 /** 784 * {@inheritDoc} 785 */ 786 @Override 787 public void addFocusables(ArrayList<View> views, int direction, int focusableMode) { 788 final int focusableCount = views.size(); 789 790 final int descendantFocusability = getDescendantFocusability(); 791 792 if (descendantFocusability != FOCUS_BLOCK_DESCENDANTS) { 793 final int count = mChildrenCount; 794 final View[] children = mChildren; 795 796 for (int i = 0; i < count; i++) { 797 final View child = children[i]; 798 if ((child.mViewFlags & VISIBILITY_MASK) == VISIBLE) { 799 child.addFocusables(views, direction, focusableMode); 800 } 801 } 802 } 803 804 // we add ourselves (if focusable) in all cases except for when we are 805 // FOCUS_AFTER_DESCENDANTS and there are some descendants focusable. this is 806 // to avoid the focus search finding layouts when a more precise search 807 // among the focusable children would be more interesting. 808 if ( 809 descendantFocusability != FOCUS_AFTER_DESCENDANTS || 810 // No focusable descendants 811 (focusableCount == views.size())) { 812 super.addFocusables(views, direction, focusableMode); 813 } 814 } 815 816 @Override 817 public void findViewsWithText(ArrayList<View> outViews, CharSequence text, int flags) { 818 super.findViewsWithText(outViews, text, flags); 819 final int childrenCount = mChildrenCount; 820 final View[] children = mChildren; 821 for (int i = 0; i < childrenCount; i++) { 822 View child = children[i]; 823 if ((child.mViewFlags & VISIBILITY_MASK) == VISIBLE 824 && (child.mPrivateFlags & IS_ROOT_NAMESPACE) == 0) { 825 child.findViewsWithText(outViews, text, flags); 826 } 827 } 828 } 829 830 @Override 831 View findViewByAccessibilityIdTraversal(int accessibilityId) { 832 View foundView = super.findViewByAccessibilityIdTraversal(accessibilityId); 833 if (foundView != null) { 834 return foundView; 835 } 836 final int childrenCount = mChildrenCount; 837 final View[] children = mChildren; 838 for (int i = 0; i < childrenCount; i++) { 839 View child = children[i]; 840 foundView = child.findViewByAccessibilityIdTraversal(accessibilityId); 841 if (foundView != null) { 842 return foundView; 843 } 844 } 845 return null; 846 } 847 848 /** 849 * {@inheritDoc} 850 */ 851 @Override 852 public void dispatchWindowFocusChanged(boolean hasFocus) { 853 super.dispatchWindowFocusChanged(hasFocus); 854 final int count = mChildrenCount; 855 final View[] children = mChildren; 856 for (int i = 0; i < count; i++) { 857 children[i].dispatchWindowFocusChanged(hasFocus); 858 } 859 } 860 861 /** 862 * {@inheritDoc} 863 */ 864 @Override 865 public void addTouchables(ArrayList<View> views) { 866 super.addTouchables(views); 867 868 final int count = mChildrenCount; 869 final View[] children = mChildren; 870 871 for (int i = 0; i < count; i++) { 872 final View child = children[i]; 873 if ((child.mViewFlags & VISIBILITY_MASK) == VISIBLE) { 874 child.addTouchables(views); 875 } 876 } 877 } 878 879 /** 880 * {@inheritDoc} 881 */ 882 @Override 883 public void dispatchDisplayHint(int hint) { 884 super.dispatchDisplayHint(hint); 885 final int count = mChildrenCount; 886 final View[] children = mChildren; 887 for (int i = 0; i < count; i++) { 888 children[i].dispatchDisplayHint(hint); 889 } 890 } 891 892 /** 893 * @hide 894 * @param child 895 * @param visibility 896 */ 897 protected void onChildVisibilityChanged(View child, int visibility) { 898 if (mTransition != null) { 899 if (visibility == VISIBLE) { 900 mTransition.showChild(this, child); 901 } else { 902 mTransition.hideChild(this, child); 903 } 904 if (visibility != VISIBLE) { 905 // Only track this on disappearing views - appearing views are already visible 906 // and don't need special handling during drawChild() 907 if (mVisibilityChangingChildren == null) { 908 mVisibilityChangingChildren = new ArrayList<View>(); 909 } 910 mVisibilityChangingChildren.add(child); 911 if (mTransitioningViews != null && mTransitioningViews.contains(child)) { 912 addDisappearingView(child); 913 } 914 } 915 } 916 917 // in all cases, for drags 918 if (mCurrentDrag != null) { 919 if (visibility == VISIBLE) { 920 notifyChildOfDrag(child); 921 } 922 } 923 } 924 925 /** 926 * {@inheritDoc} 927 */ 928 @Override 929 protected void dispatchVisibilityChanged(View changedView, int visibility) { 930 super.dispatchVisibilityChanged(changedView, visibility); 931 final int count = mChildrenCount; 932 final View[] children = mChildren; 933 for (int i = 0; i < count; i++) { 934 children[i].dispatchVisibilityChanged(changedView, visibility); 935 } 936 } 937 938 /** 939 * {@inheritDoc} 940 */ 941 @Override 942 public void dispatchWindowVisibilityChanged(int visibility) { 943 super.dispatchWindowVisibilityChanged(visibility); 944 final int count = mChildrenCount; 945 final View[] children = mChildren; 946 for (int i = 0; i < count; i++) { 947 children[i].dispatchWindowVisibilityChanged(visibility); 948 } 949 } 950 951 /** 952 * {@inheritDoc} 953 */ 954 @Override 955 public void dispatchConfigurationChanged(Configuration newConfig) { 956 super.dispatchConfigurationChanged(newConfig); 957 final int count = mChildrenCount; 958 final View[] children = mChildren; 959 for (int i = 0; i < count; i++) { 960 children[i].dispatchConfigurationChanged(newConfig); 961 } 962 } 963 964 /** 965 * {@inheritDoc} 966 */ 967 public void recomputeViewAttributes(View child) { 968 if (mAttachInfo != null && !mAttachInfo.mRecomputeGlobalAttributes) { 969 ViewParent parent = mParent; 970 if (parent != null) parent.recomputeViewAttributes(this); 971 } 972 } 973 974 @Override 975 void dispatchCollectViewAttributes(int visibility) { 976 visibility |= mViewFlags&VISIBILITY_MASK; 977 super.dispatchCollectViewAttributes(visibility); 978 final int count = mChildrenCount; 979 final View[] children = mChildren; 980 for (int i = 0; i < count; i++) { 981 children[i].dispatchCollectViewAttributes(visibility); 982 } 983 } 984 985 /** 986 * {@inheritDoc} 987 */ 988 public void bringChildToFront(View child) { 989 int index = indexOfChild(child); 990 if (index >= 0) { 991 removeFromArray(index); 992 addInArray(child, mChildrenCount); 993 child.mParent = this; 994 } 995 } 996 997 /** 998 * {@inheritDoc} 999 * 1000 * !!! TODO: write real docs 1001 */ 1002 @Override 1003 public boolean dispatchDragEvent(DragEvent event) { 1004 boolean retval = false; 1005 final float tx = event.mX; 1006 final float ty = event.mY; 1007 1008 ViewRootImpl root = getViewRootImpl(); 1009 1010 // Dispatch down the view hierarchy 1011 switch (event.mAction) { 1012 case DragEvent.ACTION_DRAG_STARTED: { 1013 // clear state to recalculate which views we drag over 1014 mCurrentDragView = null; 1015 1016 // Set up our tracking of drag-started notifications 1017 mCurrentDrag = DragEvent.obtain(event); 1018 if (mDragNotifiedChildren == null) { 1019 mDragNotifiedChildren = new HashSet<View>(); 1020 } else { 1021 mDragNotifiedChildren.clear(); 1022 } 1023 1024 // Now dispatch down to our children, caching the responses 1025 mChildAcceptsDrag = false; 1026 final int count = mChildrenCount; 1027 final View[] children = mChildren; 1028 for (int i = 0; i < count; i++) { 1029 final View child = children[i]; 1030 child.mPrivateFlags2 &= ~View.DRAG_MASK; 1031 if (child.getVisibility() == VISIBLE) { 1032 final boolean handled = notifyChildOfDrag(children[i]); 1033 if (handled) { 1034 mChildAcceptsDrag = true; 1035 } 1036 } 1037 } 1038 1039 // Return HANDLED if one of our children can accept the drag 1040 if (mChildAcceptsDrag) { 1041 retval = true; 1042 } 1043 } break; 1044 1045 case DragEvent.ACTION_DRAG_ENDED: { 1046 // Release the bookkeeping now that the drag lifecycle has ended 1047 if (mDragNotifiedChildren != null) { 1048 for (View child : mDragNotifiedChildren) { 1049 // If a child was notified about an ongoing drag, it's told that it's over 1050 child.dispatchDragEvent(event); 1051 child.mPrivateFlags2 &= ~View.DRAG_MASK; 1052 child.refreshDrawableState(); 1053 } 1054 1055 mDragNotifiedChildren.clear(); 1056 mCurrentDrag.recycle(); 1057 mCurrentDrag = null; 1058 } 1059 1060 // We consider drag-ended to have been handled if one of our children 1061 // had offered to handle the drag. 1062 if (mChildAcceptsDrag) { 1063 retval = true; 1064 } 1065 } break; 1066 1067 case DragEvent.ACTION_DRAG_LOCATION: { 1068 // Find the [possibly new] drag target 1069 final View target = findFrontmostDroppableChildAt(event.mX, event.mY, mLocalPoint); 1070 1071 // If we've changed apparent drag target, tell the view root which view 1072 // we're over now [for purposes of the eventual drag-recipient-changed 1073 // notifications to the framework] and tell the new target that the drag 1074 // has entered its bounds. The root will see setDragFocus() calls all 1075 // the way down to the final leaf view that is handling the LOCATION event 1076 // before reporting the new potential recipient to the framework. 1077 if (mCurrentDragView != target) { 1078 root.setDragFocus(target); 1079 1080 final int action = event.mAction; 1081 // If we've dragged off of a child view, send it the EXITED message 1082 if (mCurrentDragView != null) { 1083 final View view = mCurrentDragView; 1084 event.mAction = DragEvent.ACTION_DRAG_EXITED; 1085 view.dispatchDragEvent(event); 1086 view.mPrivateFlags2 &= ~View.DRAG_HOVERED; 1087 view.refreshDrawableState(); 1088 } 1089 mCurrentDragView = target; 1090 1091 // If we've dragged over a new child view, send it the ENTERED message 1092 if (target != null) { 1093 event.mAction = DragEvent.ACTION_DRAG_ENTERED; 1094 target.dispatchDragEvent(event); 1095 target.mPrivateFlags2 |= View.DRAG_HOVERED; 1096 target.refreshDrawableState(); 1097 } 1098 event.mAction = action; // restore the event's original state 1099 } 1100 1101 // Dispatch the actual drag location notice, localized into its coordinates 1102 if (target != null) { 1103 event.mX = mLocalPoint.x; 1104 event.mY = mLocalPoint.y; 1105 1106 retval = target.dispatchDragEvent(event); 1107 1108 event.mX = tx; 1109 event.mY = ty; 1110 } 1111 } break; 1112 1113 /* Entered / exited dispatch 1114 * 1115 * DRAG_ENTERED is not dispatched downwards from ViewGroup. The reason for this is 1116 * that we're about to get the corresponding LOCATION event, which we will use to 1117 * determine which of our children is the new target; at that point we will 1118 * push a DRAG_ENTERED down to the new target child [which may itself be a ViewGroup]. 1119 * 1120 * DRAG_EXITED *is* dispatched all the way down immediately: once we know the 1121 * drag has left this ViewGroup, we know by definition that every contained subview 1122 * is also no longer under the drag point. 1123 */ 1124 1125 case DragEvent.ACTION_DRAG_EXITED: { 1126 if (mCurrentDragView != null) { 1127 final View view = mCurrentDragView; 1128 view.dispatchDragEvent(event); 1129 view.mPrivateFlags2 &= ~View.DRAG_HOVERED; 1130 view.refreshDrawableState(); 1131 1132 mCurrentDragView = null; 1133 } 1134 } break; 1135 1136 case DragEvent.ACTION_DROP: { 1137 if (ViewDebug.DEBUG_DRAG) Log.d(View.VIEW_LOG_TAG, "Drop event: " + event); 1138 View target = findFrontmostDroppableChildAt(event.mX, event.mY, mLocalPoint); 1139 if (target != null) { 1140 if (ViewDebug.DEBUG_DRAG) Log.d(View.VIEW_LOG_TAG, " dispatch drop to " + target); 1141 event.mX = mLocalPoint.x; 1142 event.mY = mLocalPoint.y; 1143 retval = target.dispatchDragEvent(event); 1144 event.mX = tx; 1145 event.mY = ty; 1146 } else { 1147 if (ViewDebug.DEBUG_DRAG) { 1148 Log.d(View.VIEW_LOG_TAG, " not dropped on an accepting view"); 1149 } 1150 } 1151 } break; 1152 } 1153 1154 // If none of our children could handle the event, try here 1155 if (!retval) { 1156 // Call up to the View implementation that dispatches to installed listeners 1157 retval = super.dispatchDragEvent(event); 1158 } 1159 return retval; 1160 } 1161 1162 // Find the frontmost child view that lies under the given point, and calculate 1163 // the position within its own local coordinate system. 1164 View findFrontmostDroppableChildAt(float x, float y, PointF outLocalPoint) { 1165 final int count = mChildrenCount; 1166 final View[] children = mChildren; 1167 for (int i = count - 1; i >= 0; i--) { 1168 final View child = children[i]; 1169 if (!child.canAcceptDrag()) { 1170 continue; 1171 } 1172 1173 if (isTransformedTouchPointInView(x, y, child, outLocalPoint)) { 1174 return child; 1175 } 1176 } 1177 return null; 1178 } 1179 1180 boolean notifyChildOfDrag(View child) { 1181 if (ViewDebug.DEBUG_DRAG) { 1182 Log.d(View.VIEW_LOG_TAG, "Sending drag-started to view: " + child); 1183 } 1184 1185 boolean canAccept = false; 1186 if (! mDragNotifiedChildren.contains(child)) { 1187 mDragNotifiedChildren.add(child); 1188 canAccept = child.dispatchDragEvent(mCurrentDrag); 1189 if (canAccept && !child.canAcceptDrag()) { 1190 child.mPrivateFlags2 |= View.DRAG_CAN_ACCEPT; 1191 child.refreshDrawableState(); 1192 } 1193 } 1194 return canAccept; 1195 } 1196 1197 @Override 1198 public void dispatchSystemUiVisibilityChanged(int visible) { 1199 super.dispatchSystemUiVisibilityChanged(visible); 1200 1201 final int count = mChildrenCount; 1202 final View[] children = mChildren; 1203 for (int i=0; i <count; i++) { 1204 final View child = children[i]; 1205 child.dispatchSystemUiVisibilityChanged(visible); 1206 } 1207 } 1208 1209 @Override 1210 void updateLocalSystemUiVisibility(int localValue, int localChanges) { 1211 super.updateLocalSystemUiVisibility(localValue, localChanges); 1212 1213 final int count = mChildrenCount; 1214 final View[] children = mChildren; 1215 for (int i=0; i <count; i++) { 1216 final View child = children[i]; 1217 child.updateLocalSystemUiVisibility(localValue, localChanges); 1218 } 1219 } 1220 1221 /** 1222 * {@inheritDoc} 1223 */ 1224 @Override 1225 public boolean dispatchKeyEventPreIme(KeyEvent event) { 1226 if ((mPrivateFlags & (FOCUSED | HAS_BOUNDS)) == (FOCUSED | HAS_BOUNDS)) { 1227 return super.dispatchKeyEventPreIme(event); 1228 } else if (mFocused != null && (mFocused.mPrivateFlags & HAS_BOUNDS) == HAS_BOUNDS) { 1229 return mFocused.dispatchKeyEventPreIme(event); 1230 } 1231 return false; 1232 } 1233 1234 /** 1235 * {@inheritDoc} 1236 */ 1237 @Override 1238 public boolean dispatchKeyEvent(KeyEvent event) { 1239 if (mInputEventConsistencyVerifier != null) { 1240 mInputEventConsistencyVerifier.onKeyEvent(event, 1); 1241 } 1242 1243 if ((mPrivateFlags & (FOCUSED | HAS_BOUNDS)) == (FOCUSED | HAS_BOUNDS)) { 1244 if (super.dispatchKeyEvent(event)) { 1245 return true; 1246 } 1247 } else if (mFocused != null && (mFocused.mPrivateFlags & HAS_BOUNDS) == HAS_BOUNDS) { 1248 if (mFocused.dispatchKeyEvent(event)) { 1249 return true; 1250 } 1251 } 1252 1253 if (mInputEventConsistencyVerifier != null) { 1254 mInputEventConsistencyVerifier.onUnhandledEvent(event, 1); 1255 } 1256 return false; 1257 } 1258 1259 /** 1260 * {@inheritDoc} 1261 */ 1262 @Override 1263 public boolean dispatchKeyShortcutEvent(KeyEvent event) { 1264 if ((mPrivateFlags & (FOCUSED | HAS_BOUNDS)) == (FOCUSED | HAS_BOUNDS)) { 1265 return super.dispatchKeyShortcutEvent(event); 1266 } else if (mFocused != null && (mFocused.mPrivateFlags & HAS_BOUNDS) == HAS_BOUNDS) { 1267 return mFocused.dispatchKeyShortcutEvent(event); 1268 } 1269 return false; 1270 } 1271 1272 /** 1273 * {@inheritDoc} 1274 */ 1275 @Override 1276 public boolean dispatchTrackballEvent(MotionEvent event) { 1277 if (mInputEventConsistencyVerifier != null) { 1278 mInputEventConsistencyVerifier.onTrackballEvent(event, 1); 1279 } 1280 1281 if ((mPrivateFlags & (FOCUSED | HAS_BOUNDS)) == (FOCUSED | HAS_BOUNDS)) { 1282 if (super.dispatchTrackballEvent(event)) { 1283 return true; 1284 } 1285 } else if (mFocused != null && (mFocused.mPrivateFlags & HAS_BOUNDS) == HAS_BOUNDS) { 1286 if (mFocused.dispatchTrackballEvent(event)) { 1287 return true; 1288 } 1289 } 1290 1291 if (mInputEventConsistencyVerifier != null) { 1292 mInputEventConsistencyVerifier.onUnhandledEvent(event, 1); 1293 } 1294 return false; 1295 } 1296 1297 /** 1298 * {@inheritDoc} 1299 */ 1300 @SuppressWarnings({"ConstantConditions"}) 1301 @Override 1302 protected boolean dispatchHoverEvent(MotionEvent event) { 1303 final int action = event.getAction(); 1304 1305 // First check whether the view group wants to intercept the hover event. 1306 final boolean interceptHover = onInterceptHoverEvent(event); 1307 event.setAction(action); // restore action in case it was changed 1308 1309 MotionEvent eventNoHistory = event; 1310 boolean handled = false; 1311 1312 // Send events to the hovered children and build a new list of hover targets until 1313 // one is found that handles the event. 1314 HoverTarget firstOldHoverTarget = mFirstHoverTarget; 1315 mFirstHoverTarget = null; 1316 if (!interceptHover && action != MotionEvent.ACTION_HOVER_EXIT) { 1317 final float x = event.getX(); 1318 final float y = event.getY(); 1319 final int childrenCount = mChildrenCount; 1320 if (childrenCount != 0) { 1321 final View[] children = mChildren; 1322 HoverTarget lastHoverTarget = null; 1323 for (int i = childrenCount - 1; i >= 0; i--) { 1324 final View child = children[i]; 1325 if (!canViewReceivePointerEvents(child) 1326 || !isTransformedTouchPointInView(x, y, child, null)) { 1327 continue; 1328 } 1329 1330 // Obtain a hover target for this child. Dequeue it from the 1331 // old hover target list if the child was previously hovered. 1332 HoverTarget hoverTarget = firstOldHoverTarget; 1333 final boolean wasHovered; 1334 for (HoverTarget predecessor = null; ;) { 1335 if (hoverTarget == null) { 1336 hoverTarget = HoverTarget.obtain(child); 1337 wasHovered = false; 1338 break; 1339 } 1340 1341 if (hoverTarget.child == child) { 1342 if (predecessor != null) { 1343 predecessor.next = hoverTarget.next; 1344 } else { 1345 firstOldHoverTarget = hoverTarget.next; 1346 } 1347 hoverTarget.next = null; 1348 wasHovered = true; 1349 break; 1350 } 1351 1352 predecessor = hoverTarget; 1353 hoverTarget = hoverTarget.next; 1354 } 1355 1356 // Enqueue the hover target onto the new hover target list. 1357 if (lastHoverTarget != null) { 1358 lastHoverTarget.next = hoverTarget; 1359 } else { 1360 lastHoverTarget = hoverTarget; 1361 mFirstHoverTarget = hoverTarget; 1362 } 1363 1364 // Dispatch the event to the child. 1365 if (action == MotionEvent.ACTION_HOVER_ENTER) { 1366 if (!wasHovered) { 1367 // Send the enter as is. 1368 handled |= dispatchTransformedGenericPointerEvent( 1369 event, child); // enter 1370 } 1371 } else if (action == MotionEvent.ACTION_HOVER_MOVE) { 1372 if (!wasHovered) { 1373 // Synthesize an enter from a move. 1374 eventNoHistory = obtainMotionEventNoHistoryOrSelf(eventNoHistory); 1375 eventNoHistory.setAction(MotionEvent.ACTION_HOVER_ENTER); 1376 handled |= dispatchTransformedGenericPointerEvent( 1377 eventNoHistory, child); // enter 1378 eventNoHistory.setAction(action); 1379 1380 handled |= dispatchTransformedGenericPointerEvent( 1381 eventNoHistory, child); // move 1382 } else { 1383 // Send the move as is. 1384 handled |= dispatchTransformedGenericPointerEvent(event, child); 1385 } 1386 } 1387 if (handled) { 1388 break; 1389 } 1390 } 1391 } 1392 } 1393 1394 // Send exit events to all previously hovered children that are no longer hovered. 1395 while (firstOldHoverTarget != null) { 1396 final View child = firstOldHoverTarget.child; 1397 1398 // Exit the old hovered child. 1399 if (action == MotionEvent.ACTION_HOVER_EXIT) { 1400 // Send the exit as is. 1401 handled |= dispatchTransformedGenericPointerEvent( 1402 event, child); // exit 1403 } else { 1404 // Synthesize an exit from a move or enter. 1405 // Ignore the result because hover focus has moved to a different view. 1406 if (action == MotionEvent.ACTION_HOVER_MOVE) { 1407 dispatchTransformedGenericPointerEvent( 1408 event, child); // move 1409 } 1410 eventNoHistory = obtainMotionEventNoHistoryOrSelf(eventNoHistory); 1411 eventNoHistory.setAction(MotionEvent.ACTION_HOVER_EXIT); 1412 dispatchTransformedGenericPointerEvent( 1413 eventNoHistory, child); // exit 1414 eventNoHistory.setAction(action); 1415 } 1416 1417 final HoverTarget nextOldHoverTarget = firstOldHoverTarget.next; 1418 firstOldHoverTarget.recycle(); 1419 firstOldHoverTarget = nextOldHoverTarget; 1420 } 1421 1422 // Send events to the view group itself if no children have handled it. 1423 boolean newHoveredSelf = !handled; 1424 if (newHoveredSelf == mHoveredSelf) { 1425 if (newHoveredSelf) { 1426 // Send event to the view group as before. 1427 handled |= super.dispatchHoverEvent(event); 1428 } 1429 } else { 1430 if (mHoveredSelf) { 1431 // Exit the view group. 1432 if (action == MotionEvent.ACTION_HOVER_EXIT) { 1433 // Send the exit as is. 1434 handled |= super.dispatchHoverEvent(event); // exit 1435 } else { 1436 // Synthesize an exit from a move or enter. 1437 // Ignore the result because hover focus is moving to a different view. 1438 if (action == MotionEvent.ACTION_HOVER_MOVE) { 1439 super.dispatchHoverEvent(event); // move 1440 } 1441 eventNoHistory = obtainMotionEventNoHistoryOrSelf(eventNoHistory); 1442 eventNoHistory.setAction(MotionEvent.ACTION_HOVER_EXIT); 1443 super.dispatchHoverEvent(eventNoHistory); // exit 1444 eventNoHistory.setAction(action); 1445 } 1446 mHoveredSelf = false; 1447 } 1448 1449 if (newHoveredSelf) { 1450 // Enter the view group. 1451 if (action == MotionEvent.ACTION_HOVER_ENTER) { 1452 // Send the enter as is. 1453 handled |= super.dispatchHoverEvent(event); // enter 1454 mHoveredSelf = true; 1455 } else if (action == MotionEvent.ACTION_HOVER_MOVE) { 1456 // Synthesize an enter from a move. 1457 eventNoHistory = obtainMotionEventNoHistoryOrSelf(eventNoHistory); 1458 eventNoHistory.setAction(MotionEvent.ACTION_HOVER_ENTER); 1459 handled |= super.dispatchHoverEvent(eventNoHistory); // enter 1460 eventNoHistory.setAction(action); 1461 1462 handled |= super.dispatchHoverEvent(eventNoHistory); // move 1463 mHoveredSelf = true; 1464 } 1465 } 1466 } 1467 1468 // Recycle the copy of the event that we made. 1469 if (eventNoHistory != event) { 1470 eventNoHistory.recycle(); 1471 } 1472 1473 // Done. 1474 return handled; 1475 } 1476 1477 /** @hide */ 1478 @Override 1479 protected boolean hasHoveredChild() { 1480 return mFirstHoverTarget != null; 1481 } 1482 1483 /** 1484 * Implement this method to intercept hover events before they are handled 1485 * by child views. 1486 * <p> 1487 * This method is called before dispatching a hover event to a child of 1488 * the view group or to the view group's own {@link #onHoverEvent} to allow 1489 * the view group a chance to intercept the hover event. 1490 * This method can also be used to watch all pointer motions that occur within 1491 * the bounds of the view group even when the pointer is hovering over 1492 * a child of the view group rather than over the view group itself. 1493 * </p><p> 1494 * The view group can prevent its children from receiving hover events by 1495 * implementing this method and returning <code>true</code> to indicate 1496 * that it would like to intercept hover events. The view group must 1497 * continuously return <code>true</code> from {@link #onInterceptHoverEvent} 1498 * for as long as it wishes to continue intercepting hover events from 1499 * its children. 1500 * </p><p> 1501 * Interception preserves the invariant that at most one view can be 1502 * hovered at a time by transferring hover focus from the currently hovered 1503 * child to the view group or vice-versa as needed. 1504 * </p><p> 1505 * If this method returns <code>true</code> and a child is already hovered, then the 1506 * child view will first receive a hover exit event and then the view group 1507 * itself will receive a hover enter event in {@link #onHoverEvent}. 1508 * Likewise, if this method had previously returned <code>true</code> to intercept hover 1509 * events and instead returns <code>false</code> while the pointer is hovering 1510 * within the bounds of one of a child, then the view group will first receive a 1511 * hover exit event in {@link #onHoverEvent} and then the hovered child will 1512 * receive a hover enter event. 1513 * </p><p> 1514 * The default implementation always returns false. 1515 * </p> 1516 * 1517 * @param event The motion event that describes the hover. 1518 * @return True if the view group would like to intercept the hover event 1519 * and prevent its children from receiving it. 1520 */ 1521 public boolean onInterceptHoverEvent(MotionEvent event) { 1522 return false; 1523 } 1524 1525 private static MotionEvent obtainMotionEventNoHistoryOrSelf(MotionEvent event) { 1526 if (event.getHistorySize() == 0) { 1527 return event; 1528 } 1529 return MotionEvent.obtainNoHistory(event); 1530 } 1531 1532 /** 1533 * {@inheritDoc} 1534 */ 1535 @Override 1536 protected boolean dispatchGenericPointerEvent(MotionEvent event) { 1537 // Send the event to the child under the pointer. 1538 final int childrenCount = mChildrenCount; 1539 if (childrenCount != 0) { 1540 final View[] children = mChildren; 1541 final float x = event.getX(); 1542 final float y = event.getY(); 1543 1544 for (int i = childrenCount - 1; i >= 0; i--) { 1545 final View child = children[i]; 1546 if (!canViewReceivePointerEvents(child) 1547 || !isTransformedTouchPointInView(x, y, child, null)) { 1548 continue; 1549 } 1550 1551 if (dispatchTransformedGenericPointerEvent(event, child)) { 1552 return true; 1553 } 1554 } 1555 } 1556 1557 // No child handled the event. Send it to this view group. 1558 return super.dispatchGenericPointerEvent(event); 1559 } 1560 1561 /** 1562 * {@inheritDoc} 1563 */ 1564 @Override 1565 protected boolean dispatchGenericFocusedEvent(MotionEvent event) { 1566 // Send the event to the focused child or to this view group if it has focus. 1567 if ((mPrivateFlags & (FOCUSED | HAS_BOUNDS)) == (FOCUSED | HAS_BOUNDS)) { 1568 return super.dispatchGenericFocusedEvent(event); 1569 } else if (mFocused != null && (mFocused.mPrivateFlags & HAS_BOUNDS) == HAS_BOUNDS) { 1570 return mFocused.dispatchGenericMotionEvent(event); 1571 } 1572 return false; 1573 } 1574 1575 /** 1576 * Dispatches a generic pointer event to a child, taking into account 1577 * transformations that apply to the child. 1578 * 1579 * @param event The event to send. 1580 * @param child The view to send the event to. 1581 * @return {@code true} if the child handled the event. 1582 */ 1583 private boolean dispatchTransformedGenericPointerEvent(MotionEvent event, View child) { 1584 final float offsetX = mScrollX - child.mLeft; 1585 final float offsetY = mScrollY - child.mTop; 1586 1587 boolean handled; 1588 if (!child.hasIdentityMatrix()) { 1589 MotionEvent transformedEvent = MotionEvent.obtain(event); 1590 transformedEvent.offsetLocation(offsetX, offsetY); 1591 transformedEvent.transform(child.getInverseMatrix()); 1592 handled = child.dispatchGenericMotionEvent(transformedEvent); 1593 transformedEvent.recycle(); 1594 } else { 1595 event.offsetLocation(offsetX, offsetY); 1596 handled = child.dispatchGenericMotionEvent(event); 1597 event.offsetLocation(-offsetX, -offsetY); 1598 } 1599 return handled; 1600 } 1601 1602 /** 1603 * {@inheritDoc} 1604 */ 1605 @Override 1606 public boolean dispatchTouchEvent(MotionEvent ev) { 1607 if (mInputEventConsistencyVerifier != null) { 1608 mInputEventConsistencyVerifier.onTouchEvent(ev, 1); 1609 } 1610 1611 boolean handled = false; 1612 if (onFilterTouchEventForSecurity(ev)) { 1613 final int action = ev.getAction(); 1614 final int actionMasked = action & MotionEvent.ACTION_MASK; 1615 1616 // Handle an initial down. 1617 if (actionMasked == MotionEvent.ACTION_DOWN) { 1618 // Throw away all previous state when starting a new touch gesture. 1619 // The framework may have dropped the up or cancel event for the previous gesture 1620 // due to an app switch, ANR, or some other state change. 1621 cancelAndClearTouchTargets(ev); 1622 resetTouchState(); 1623 } 1624 1625 // Check for interception. 1626 final boolean intercepted; 1627 if (actionMasked == MotionEvent.ACTION_DOWN 1628 || mFirstTouchTarget != null) { 1629 final boolean disallowIntercept = (mGroupFlags & FLAG_DISALLOW_INTERCEPT) != 0; 1630 if (!disallowIntercept) { 1631 intercepted = onInterceptTouchEvent(ev); 1632 ev.setAction(action); // restore action in case it was changed 1633 } else { 1634 intercepted = false; 1635 } 1636 } else { 1637 // There are no touch targets and this action is not an initial down 1638 // so this view group continues to intercept touches. 1639 intercepted = true; 1640 } 1641 1642 // Check for cancelation. 1643 final boolean canceled = resetCancelNextUpFlag(this) 1644 || actionMasked == MotionEvent.ACTION_CANCEL; 1645 1646 // Update list of touch targets for pointer down, if needed. 1647 final boolean split = (mGroupFlags & FLAG_SPLIT_MOTION_EVENTS) != 0; 1648 TouchTarget newTouchTarget = null; 1649 boolean alreadyDispatchedToNewTouchTarget = false; 1650 if (!canceled && !intercepted) { 1651 if (actionMasked == MotionEvent.ACTION_DOWN 1652 || (split && actionMasked == MotionEvent.ACTION_POINTER_DOWN) 1653 || actionMasked == MotionEvent.ACTION_HOVER_MOVE) { 1654 final int actionIndex = ev.getActionIndex(); // always 0 for down 1655 final int idBitsToAssign = split ? 1 << ev.getPointerId(actionIndex) 1656 : TouchTarget.ALL_POINTER_IDS; 1657 1658 // Clean up earlier touch targets for this pointer id in case they 1659 // have become out of sync. 1660 removePointersFromTouchTargets(idBitsToAssign); 1661 1662 final int childrenCount = mChildrenCount; 1663 if (childrenCount != 0) { 1664 // Find a child that can receive the event. 1665 // Scan children from front to back. 1666 final View[] children = mChildren; 1667 final float x = ev.getX(actionIndex); 1668 final float y = ev.getY(actionIndex); 1669 1670 for (int i = childrenCount - 1; i >= 0; i--) { 1671 final View child = children[i]; 1672 if (!canViewReceivePointerEvents(child) 1673 || !isTransformedTouchPointInView(x, y, child, null)) { 1674 continue; 1675 } 1676 1677 newTouchTarget = getTouchTarget(child); 1678 if (newTouchTarget != null) { 1679 // Child is already receiving touch within its bounds. 1680 // Give it the new pointer in addition to the ones it is handling. 1681 newTouchTarget.pointerIdBits |= idBitsToAssign; 1682 break; 1683 } 1684 1685 resetCancelNextUpFlag(child); 1686 if (dispatchTransformedTouchEvent(ev, false, child, idBitsToAssign)) { 1687 // Child wants to receive touch within its bounds. 1688 mLastTouchDownTime = ev.getDownTime(); 1689 mLastTouchDownIndex = i; 1690 mLastTouchDownX = ev.getX(); 1691 mLastTouchDownY = ev.getY(); 1692 newTouchTarget = addTouchTarget(child, idBitsToAssign); 1693 alreadyDispatchedToNewTouchTarget = true; 1694 break; 1695 } 1696 } 1697 } 1698 1699 if (newTouchTarget == null && mFirstTouchTarget != null) { 1700 // Did not find a child to receive the event. 1701 // Assign the pointer to the least recently added target. 1702 newTouchTarget = mFirstTouchTarget; 1703 while (newTouchTarget.next != null) { 1704 newTouchTarget = newTouchTarget.next; 1705 } 1706 newTouchTarget.pointerIdBits |= idBitsToAssign; 1707 } 1708 } 1709 } 1710 1711 // Dispatch to touch targets. 1712 if (mFirstTouchTarget == null) { 1713 // No touch targets so treat this as an ordinary view. 1714 handled = dispatchTransformedTouchEvent(ev, canceled, null, 1715 TouchTarget.ALL_POINTER_IDS); 1716 } else { 1717 // Dispatch to touch targets, excluding the new touch target if we already 1718 // dispatched to it. Cancel touch targets if necessary. 1719 TouchTarget predecessor = null; 1720 TouchTarget target = mFirstTouchTarget; 1721 while (target != null) { 1722 final TouchTarget next = target.next; 1723 if (alreadyDispatchedToNewTouchTarget && target == newTouchTarget) { 1724 handled = true; 1725 } else { 1726 final boolean cancelChild = resetCancelNextUpFlag(target.child) 1727 || intercepted; 1728 if (dispatchTransformedTouchEvent(ev, cancelChild, 1729 target.child, target.pointerIdBits)) { 1730 handled = true; 1731 } 1732 if (cancelChild) { 1733 if (predecessor == null) { 1734 mFirstTouchTarget = next; 1735 } else { 1736 predecessor.next = next; 1737 } 1738 target.recycle(); 1739 target = next; 1740 continue; 1741 } 1742 } 1743 predecessor = target; 1744 target = next; 1745 } 1746 } 1747 1748 // Update list of touch targets for pointer up or cancel, if needed. 1749 if (canceled 1750 || actionMasked == MotionEvent.ACTION_UP 1751 || actionMasked == MotionEvent.ACTION_HOVER_MOVE) { 1752 resetTouchState(); 1753 } else if (split && actionMasked == MotionEvent.ACTION_POINTER_UP) { 1754 final int actionIndex = ev.getActionIndex(); 1755 final int idBitsToRemove = 1 << ev.getPointerId(actionIndex); 1756 removePointersFromTouchTargets(idBitsToRemove); 1757 } 1758 } 1759 1760 if (!handled && mInputEventConsistencyVerifier != null) { 1761 mInputEventConsistencyVerifier.onUnhandledEvent(ev, 1); 1762 } 1763 return handled; 1764 } 1765 1766 /** 1767 * Resets all touch state in preparation for a new cycle. 1768 */ 1769 private void resetTouchState() { 1770 clearTouchTargets(); 1771 resetCancelNextUpFlag(this); 1772 mGroupFlags &= ~FLAG_DISALLOW_INTERCEPT; 1773 } 1774 1775 /** 1776 * Resets the cancel next up flag. 1777 * Returns true if the flag was previously set. 1778 */ 1779 private boolean resetCancelNextUpFlag(View view) { 1780 if ((view.mPrivateFlags & CANCEL_NEXT_UP_EVENT) != 0) { 1781 view.mPrivateFlags &= ~CANCEL_NEXT_UP_EVENT; 1782 return true; 1783 } 1784 return false; 1785 } 1786 1787 /** 1788 * Clears all touch targets. 1789 */ 1790 private void clearTouchTargets() { 1791 TouchTarget target = mFirstTouchTarget; 1792 if (target != null) { 1793 do { 1794 TouchTarget next = target.next; 1795 target.recycle(); 1796 target = next; 1797 } while (target != null); 1798 mFirstTouchTarget = null; 1799 } 1800 } 1801 1802 /** 1803 * Cancels and clears all touch targets. 1804 */ 1805 private void cancelAndClearTouchTargets(MotionEvent event) { 1806 if (mFirstTouchTarget != null) { 1807 boolean syntheticEvent = false; 1808 if (event == null) { 1809 final long now = SystemClock.uptimeMillis(); 1810 event = MotionEvent.obtain(now, now, 1811 MotionEvent.ACTION_CANCEL, 0.0f, 0.0f, 0); 1812 event.setSource(InputDevice.SOURCE_TOUCHSCREEN); 1813 syntheticEvent = true; 1814 } 1815 1816 for (TouchTarget target = mFirstTouchTarget; target != null; target = target.next) { 1817 resetCancelNextUpFlag(target.child); 1818 dispatchTransformedTouchEvent(event, true, target.child, target.pointerIdBits); 1819 } 1820 clearTouchTargets(); 1821 1822 if (syntheticEvent) { 1823 event.recycle(); 1824 } 1825 } 1826 } 1827 1828 /** 1829 * Gets the touch target for specified child view. 1830 * Returns null if not found. 1831 */ 1832 private TouchTarget getTouchTarget(View child) { 1833 for (TouchTarget target = mFirstTouchTarget; target != null; target = target.next) { 1834 if (target.child == child) { 1835 return target; 1836 } 1837 } 1838 return null; 1839 } 1840 1841 /** 1842 * Adds a touch target for specified child to the beginning of the list. 1843 * Assumes the target child is not already present. 1844 */ 1845 private TouchTarget addTouchTarget(View child, int pointerIdBits) { 1846 TouchTarget target = TouchTarget.obtain(child, pointerIdBits); 1847 target.next = mFirstTouchTarget; 1848 mFirstTouchTarget = target; 1849 return target; 1850 } 1851 1852 /** 1853 * Removes the pointer ids from consideration. 1854 */ 1855 private void removePointersFromTouchTargets(int pointerIdBits) { 1856 TouchTarget predecessor = null; 1857 TouchTarget target = mFirstTouchTarget; 1858 while (target != null) { 1859 final TouchTarget next = target.next; 1860 if ((target.pointerIdBits & pointerIdBits) != 0) { 1861 target.pointerIdBits &= ~pointerIdBits; 1862 if (target.pointerIdBits == 0) { 1863 if (predecessor == null) { 1864 mFirstTouchTarget = next; 1865 } else { 1866 predecessor.next = next; 1867 } 1868 target.recycle(); 1869 target = next; 1870 continue; 1871 } 1872 } 1873 predecessor = target; 1874 target = next; 1875 } 1876 } 1877 1878 /** 1879 * Returns true if a child view can receive pointer events. 1880 * @hide 1881 */ 1882 private static boolean canViewReceivePointerEvents(View child) { 1883 return (child.mViewFlags & VISIBILITY_MASK) == VISIBLE 1884 || child.getAnimation() != null; 1885 } 1886 1887 /** 1888 * Returns true if a child view contains the specified point when transformed 1889 * into its coordinate space. 1890 * Child must not be null. 1891 * @hide 1892 */ 1893 protected boolean isTransformedTouchPointInView(float x, float y, View child, 1894 PointF outLocalPoint) { 1895 float localX = x + mScrollX - child.mLeft; 1896 float localY = y + mScrollY - child.mTop; 1897 if (! child.hasIdentityMatrix() && mAttachInfo != null) { 1898 final float[] localXY = mAttachInfo.mTmpTransformLocation; 1899 localXY[0] = localX; 1900 localXY[1] = localY; 1901 child.getInverseMatrix().mapPoints(localXY); 1902 localX = localXY[0]; 1903 localY = localXY[1]; 1904 } 1905 final boolean isInView = child.pointInView(localX, localY); 1906 if (isInView && outLocalPoint != null) { 1907 outLocalPoint.set(localX, localY); 1908 } 1909 return isInView; 1910 } 1911 1912 /** 1913 * Transforms a motion event into the coordinate space of a particular child view, 1914 * filters out irrelevant pointer ids, and overrides its action if necessary. 1915 * If child is null, assumes the MotionEvent will be sent to this ViewGroup instead. 1916 */ 1917 private boolean dispatchTransformedTouchEvent(MotionEvent event, boolean cancel, 1918 View child, int desiredPointerIdBits) { 1919 final boolean handled; 1920 1921 // Canceling motions is a special case. We don't need to perform any transformations 1922 // or filtering. The important part is the action, not the contents. 1923 final int oldAction = event.getAction(); 1924 if (cancel || oldAction == MotionEvent.ACTION_CANCEL) { 1925 event.setAction(MotionEvent.ACTION_CANCEL); 1926 if (child == null) { 1927 handled = super.dispatchTouchEvent(event); 1928 } else { 1929 handled = child.dispatchTouchEvent(event); 1930 } 1931 event.setAction(oldAction); 1932 return handled; 1933 } 1934 1935 // Calculate the number of pointers to deliver. 1936 final int oldPointerIdBits = event.getPointerIdBits(); 1937 final int newPointerIdBits = oldPointerIdBits & desiredPointerIdBits; 1938 1939 // If for some reason we ended up in an inconsistent state where it looks like we 1940 // might produce a motion event with no pointers in it, then drop the event. 1941 if (newPointerIdBits == 0) { 1942 return false; 1943 } 1944 1945 // If the number of pointers is the same and we don't need to perform any fancy 1946 // irreversible transformations, then we can reuse the motion event for this 1947 // dispatch as long as we are careful to revert any changes we make. 1948 // Otherwise we need to make a copy. 1949 final MotionEvent transformedEvent; 1950 if (newPointerIdBits == oldPointerIdBits) { 1951 if (child == null || child.hasIdentityMatrix()) { 1952 if (child == null) { 1953 handled = super.dispatchTouchEvent(event); 1954 } else { 1955 final float offsetX = mScrollX - child.mLeft; 1956 final float offsetY = mScrollY - child.mTop; 1957 event.offsetLocation(offsetX, offsetY); 1958 1959 handled = child.dispatchTouchEvent(event); 1960 1961 event.offsetLocation(-offsetX, -offsetY); 1962 } 1963 return handled; 1964 } 1965 transformedEvent = MotionEvent.obtain(event); 1966 } else { 1967 transformedEvent = event.split(newPointerIdBits); 1968 } 1969 1970 // Perform any necessary transformations and dispatch. 1971 if (child == null) { 1972 handled = super.dispatchTouchEvent(transformedEvent); 1973 } else { 1974 final float offsetX = mScrollX - child.mLeft; 1975 final float offsetY = mScrollY - child.mTop; 1976 transformedEvent.offsetLocation(offsetX, offsetY); 1977 if (! child.hasIdentityMatrix()) { 1978 transformedEvent.transform(child.getInverseMatrix()); 1979 } 1980 1981 handled = child.dispatchTouchEvent(transformedEvent); 1982 } 1983 1984 // Done. 1985 transformedEvent.recycle(); 1986 return handled; 1987 } 1988 1989 /** 1990 * Enable or disable the splitting of MotionEvents to multiple children during touch event 1991 * dispatch. This behavior is enabled by default for applications that target an 1992 * SDK version of {@link Build.VERSION_CODES#HONEYCOMB} or newer. 1993 * 1994 * <p>When this option is enabled MotionEvents may be split and dispatched to different child 1995 * views depending on where each pointer initially went down. This allows for user interactions 1996 * such as scrolling two panes of content independently, chording of buttons, and performing 1997 * independent gestures on different pieces of content. 1998 * 1999 * @param split <code>true</code> to allow MotionEvents to be split and dispatched to multiple 2000 * child views. <code>false</code> to only allow one child view to be the target of 2001 * any MotionEvent received by this ViewGroup. 2002 */ 2003 public void setMotionEventSplittingEnabled(boolean split) { 2004 // TODO Applications really shouldn't change this setting mid-touch event, 2005 // but perhaps this should handle that case and send ACTION_CANCELs to any child views 2006 // with gestures in progress when this is changed. 2007 if (split) { 2008 mGroupFlags |= FLAG_SPLIT_MOTION_EVENTS; 2009 } else { 2010 mGroupFlags &= ~FLAG_SPLIT_MOTION_EVENTS; 2011 } 2012 } 2013 2014 /** 2015 * Returns true if MotionEvents dispatched to this ViewGroup can be split to multiple children. 2016 * @return true if MotionEvents dispatched to this ViewGroup can be split to multiple children. 2017 */ 2018 public boolean isMotionEventSplittingEnabled() { 2019 return (mGroupFlags & FLAG_SPLIT_MOTION_EVENTS) == FLAG_SPLIT_MOTION_EVENTS; 2020 } 2021 2022 /** 2023 * {@inheritDoc} 2024 */ 2025 public void requestDisallowInterceptTouchEvent(boolean disallowIntercept) { 2026 2027 if (disallowIntercept == ((mGroupFlags & FLAG_DISALLOW_INTERCEPT) != 0)) { 2028 // We're already in this state, assume our ancestors are too 2029 return; 2030 } 2031 2032 if (disallowIntercept) { 2033 mGroupFlags |= FLAG_DISALLOW_INTERCEPT; 2034 } else { 2035 mGroupFlags &= ~FLAG_DISALLOW_INTERCEPT; 2036 } 2037 2038 // Pass it up to our parent 2039 if (mParent != null) { 2040 mParent.requestDisallowInterceptTouchEvent(disallowIntercept); 2041 } 2042 } 2043 2044 /** 2045 * Implement this method to intercept all touch screen motion events. This 2046 * allows you to watch events as they are dispatched to your children, and 2047 * take ownership of the current gesture at any point. 2048 * 2049 * <p>Using this function takes some care, as it has a fairly complicated 2050 * interaction with {@link View#onTouchEvent(MotionEvent) 2051 * View.onTouchEvent(MotionEvent)}, and using it requires implementing 2052 * that method as well as this one in the correct way. Events will be 2053 * received in the following order: 2054 * 2055 * <ol> 2056 * <li> You will receive the down event here. 2057 * <li> The down event will be handled either by a child of this view 2058 * group, or given to your own onTouchEvent() method to handle; this means 2059 * you should implement onTouchEvent() to return true, so you will 2060 * continue to see the rest of the gesture (instead of looking for 2061 * a parent view to handle it). Also, by returning true from 2062 * onTouchEvent(), you will not receive any following 2063 * events in onInterceptTouchEvent() and all touch processing must 2064 * happen in onTouchEvent() like normal. 2065 * <li> For as long as you return false from this function, each following 2066 * event (up to and including the final up) will be delivered first here 2067 * and then to the target's onTouchEvent(). 2068 * <li> If you return true from here, you will not receive any 2069 * following events: the target view will receive the same event but 2070 * with the action {@link MotionEvent#ACTION_CANCEL}, and all further 2071 * events will be delivered to your onTouchEvent() method and no longer 2072 * appear here. 2073 * </ol> 2074 * 2075 * @param ev The motion event being dispatched down the hierarchy. 2076 * @return Return true to steal motion events from the children and have 2077 * them dispatched to this ViewGroup through onTouchEvent(). 2078 * The current target will receive an ACTION_CANCEL event, and no further 2079 * messages will be delivered here. 2080 */ 2081 public boolean onInterceptTouchEvent(MotionEvent ev) { 2082 return false; 2083 } 2084 2085 /** 2086 * {@inheritDoc} 2087 * 2088 * Looks for a view to give focus to respecting the setting specified by 2089 * {@link #getDescendantFocusability()}. 2090 * 2091 * Uses {@link #onRequestFocusInDescendants(int, android.graphics.Rect)} to 2092 * find focus within the children of this group when appropriate. 2093 * 2094 * @see #FOCUS_BEFORE_DESCENDANTS 2095 * @see #FOCUS_AFTER_DESCENDANTS 2096 * @see #FOCUS_BLOCK_DESCENDANTS 2097 * @see #onRequestFocusInDescendants(int, android.graphics.Rect) 2098 */ 2099 @Override 2100 public boolean requestFocus(int direction, Rect previouslyFocusedRect) { 2101 if (DBG) { 2102 System.out.println(this + " ViewGroup.requestFocus direction=" 2103 + direction); 2104 } 2105 int descendantFocusability = getDescendantFocusability(); 2106 2107 switch (descendantFocusability) { 2108 case FOCUS_BLOCK_DESCENDANTS: 2109 return super.requestFocus(direction, previouslyFocusedRect); 2110 case FOCUS_BEFORE_DESCENDANTS: { 2111 final boolean took = super.requestFocus(direction, previouslyFocusedRect); 2112 return took ? took : onRequestFocusInDescendants(direction, previouslyFocusedRect); 2113 } 2114 case FOCUS_AFTER_DESCENDANTS: { 2115 final boolean took = onRequestFocusInDescendants(direction, previouslyFocusedRect); 2116 return took ? took : super.requestFocus(direction, previouslyFocusedRect); 2117 } 2118 default: 2119 throw new IllegalStateException("descendant focusability must be " 2120 + "one of FOCUS_BEFORE_DESCENDANTS, FOCUS_AFTER_DESCENDANTS, FOCUS_BLOCK_DESCENDANTS " 2121 + "but is " + descendantFocusability); 2122 } 2123 } 2124 2125 /** 2126 * Look for a descendant to call {@link View#requestFocus} on. 2127 * Called by {@link ViewGroup#requestFocus(int, android.graphics.Rect)} 2128 * when it wants to request focus within its children. Override this to 2129 * customize how your {@link ViewGroup} requests focus within its children. 2130 * @param direction One of FOCUS_UP, FOCUS_DOWN, FOCUS_LEFT, and FOCUS_RIGHT 2131 * @param previouslyFocusedRect The rectangle (in this View's coordinate system) 2132 * to give a finer grained hint about where focus is coming from. May be null 2133 * if there is no hint. 2134 * @return Whether focus was taken. 2135 */ 2136 @SuppressWarnings({"ConstantConditions"}) 2137 protected boolean onRequestFocusInDescendants(int direction, 2138 Rect previouslyFocusedRect) { 2139 int index; 2140 int increment; 2141 int end; 2142 int count = mChildrenCount; 2143 if ((direction & FOCUS_FORWARD) != 0) { 2144 index = 0; 2145 increment = 1; 2146 end = count; 2147 } else { 2148 index = count - 1; 2149 increment = -1; 2150 end = -1; 2151 } 2152 final View[] children = mChildren; 2153 for (int i = index; i != end; i += increment) { 2154 View child = children[i]; 2155 if ((child.mViewFlags & VISIBILITY_MASK) == VISIBLE) { 2156 if (child.requestFocus(direction, previouslyFocusedRect)) { 2157 return true; 2158 } 2159 } 2160 } 2161 return false; 2162 } 2163 2164 /** 2165 * {@inheritDoc} 2166 * 2167 * @hide 2168 */ 2169 @Override 2170 public void dispatchStartTemporaryDetach() { 2171 super.dispatchStartTemporaryDetach(); 2172 final int count = mChildrenCount; 2173 final View[] children = mChildren; 2174 for (int i = 0; i < count; i++) { 2175 children[i].dispatchStartTemporaryDetach(); 2176 } 2177 } 2178 2179 /** 2180 * {@inheritDoc} 2181 * 2182 * @hide 2183 */ 2184 @Override 2185 public void dispatchFinishTemporaryDetach() { 2186 super.dispatchFinishTemporaryDetach(); 2187 final int count = mChildrenCount; 2188 final View[] children = mChildren; 2189 for (int i = 0; i < count; i++) { 2190 children[i].dispatchFinishTemporaryDetach(); 2191 } 2192 } 2193 2194 /** 2195 * {@inheritDoc} 2196 */ 2197 @Override 2198 void dispatchAttachedToWindow(AttachInfo info, int visibility) { 2199 mGroupFlags |= FLAG_PREVENT_DISPATCH_ATTACHED_TO_WINDOW; 2200 super.dispatchAttachedToWindow(info, visibility); 2201 mGroupFlags &= ~FLAG_PREVENT_DISPATCH_ATTACHED_TO_WINDOW; 2202 2203 visibility |= mViewFlags & VISIBILITY_MASK; 2204 2205 final int count = mChildrenCount; 2206 final View[] children = mChildren; 2207 for (int i = 0; i < count; i++) { 2208 children[i].dispatchAttachedToWindow(info, visibility); 2209 } 2210 } 2211 2212 @Override 2213 boolean dispatchPopulateAccessibilityEventInternal(AccessibilityEvent event) { 2214 boolean handled = super.dispatchPopulateAccessibilityEventInternal(event); 2215 if (handled) { 2216 return handled; 2217 } 2218 // Let our children have a shot in populating the event. 2219 for (int i = 0, count = getChildCount(); i < count; i++) { 2220 View child = getChildAt(i); 2221 if ((child.mViewFlags & VISIBILITY_MASK) == VISIBLE) { 2222 handled = getChildAt(i).dispatchPopulateAccessibilityEvent(event); 2223 if (handled) { 2224 return handled; 2225 } 2226 } 2227 } 2228 return false; 2229 } 2230 2231 @Override 2232 void onInitializeAccessibilityNodeInfoInternal(AccessibilityNodeInfo info) { 2233 super.onInitializeAccessibilityNodeInfoInternal(info); 2234 for (int i = 0, count = mChildrenCount; i < count; i++) { 2235 View child = mChildren[i]; 2236 if ((child.mViewFlags & VISIBILITY_MASK) == VISIBLE 2237 && (child.mPrivateFlags & IS_ROOT_NAMESPACE) == 0) { 2238 info.addChild(child); 2239 } 2240 } 2241 } 2242 2243 /** 2244 * {@inheritDoc} 2245 */ 2246 @Override 2247 void dispatchDetachedFromWindow() { 2248 // If we still have a touch target, we are still in the process of 2249 // dispatching motion events to a child; we need to get rid of that 2250 // child to avoid dispatching events to it after the window is torn 2251 // down. To make sure we keep the child in a consistent state, we 2252 // first send it an ACTION_CANCEL motion event. 2253 cancelAndClearTouchTargets(null); 2254 2255 // In case view is detached while transition is running 2256 mLayoutSuppressed = false; 2257 2258 // Tear down our drag tracking 2259 mDragNotifiedChildren = null; 2260 if (mCurrentDrag != null) { 2261 mCurrentDrag.recycle(); 2262 mCurrentDrag = null; 2263 } 2264 2265 final int count = mChildrenCount; 2266 final View[] children = mChildren; 2267 for (int i = 0; i < count; i++) { 2268 children[i].dispatchDetachedFromWindow(); 2269 } 2270 super.dispatchDetachedFromWindow(); 2271 } 2272 2273 /** 2274 * {@inheritDoc} 2275 */ 2276 @Override 2277 public void setPadding(int left, int top, int right, int bottom) { 2278 super.setPadding(left, top, right, bottom); 2279 2280 if ((mPaddingLeft | mPaddingTop | mPaddingRight | mPaddingBottom) != 0) { 2281 mGroupFlags |= FLAG_PADDING_NOT_NULL; 2282 } else { 2283 mGroupFlags &= ~FLAG_PADDING_NOT_NULL; 2284 } 2285 } 2286 2287 /** 2288 * {@inheritDoc} 2289 */ 2290 @Override 2291 protected void dispatchSaveInstanceState(SparseArray<Parcelable> container) { 2292 super.dispatchSaveInstanceState(container); 2293 final int count = mChildrenCount; 2294 final View[] children = mChildren; 2295 for (int i = 0; i < count; i++) { 2296 View c = children[i]; 2297 if ((c.mViewFlags & PARENT_SAVE_DISABLED_MASK) != PARENT_SAVE_DISABLED) { 2298 c.dispatchSaveInstanceState(container); 2299 } 2300 } 2301 } 2302 2303 /** 2304 * Perform dispatching of a {@link #saveHierarchyState(android.util.SparseArray)} freeze()} 2305 * to only this view, not to its children. For use when overriding 2306 * {@link #dispatchSaveInstanceState(android.util.SparseArray)} dispatchFreeze()} to allow 2307 * subclasses to freeze their own state but not the state of their children. 2308 * 2309 * @param container the container 2310 */ 2311 protected void dispatchFreezeSelfOnly(SparseArray<Parcelable> container) { 2312 super.dispatchSaveInstanceState(container); 2313 } 2314 2315 /** 2316 * {@inheritDoc} 2317 */ 2318 @Override 2319 protected void dispatchRestoreInstanceState(SparseArray<Parcelable> container) { 2320 super.dispatchRestoreInstanceState(container); 2321 final int count = mChildrenCount; 2322 final View[] children = mChildren; 2323 for (int i = 0; i < count; i++) { 2324 View c = children[i]; 2325 if ((c.mViewFlags & PARENT_SAVE_DISABLED_MASK) != PARENT_SAVE_DISABLED) { 2326 c.dispatchRestoreInstanceState(container); 2327 } 2328 } 2329 } 2330 2331 /** 2332 * Perform dispatching of a {@link #restoreHierarchyState(android.util.SparseArray)} 2333 * to only this view, not to its children. For use when overriding 2334 * {@link #dispatchRestoreInstanceState(android.util.SparseArray)} to allow 2335 * subclasses to thaw their own state but not the state of their children. 2336 * 2337 * @param container the container 2338 */ 2339 protected void dispatchThawSelfOnly(SparseArray<Parcelable> container) { 2340 super.dispatchRestoreInstanceState(container); 2341 } 2342 2343 /** 2344 * Enables or disables the drawing cache for each child of this view group. 2345 * 2346 * @param enabled true to enable the cache, false to dispose of it 2347 */ 2348 protected void setChildrenDrawingCacheEnabled(boolean enabled) { 2349 if (enabled || (mPersistentDrawingCache & PERSISTENT_ALL_CACHES) != PERSISTENT_ALL_CACHES) { 2350 final View[] children = mChildren; 2351 final int count = mChildrenCount; 2352 for (int i = 0; i < count; i++) { 2353 children[i].setDrawingCacheEnabled(enabled); 2354 } 2355 } 2356 } 2357 2358 @Override 2359 protected void onAnimationStart() { 2360 super.onAnimationStart(); 2361 2362 // When this ViewGroup's animation starts, build the cache for the children 2363 if ((mGroupFlags & FLAG_ANIMATION_CACHE) == FLAG_ANIMATION_CACHE) { 2364 final int count = mChildrenCount; 2365 final View[] children = mChildren; 2366 final boolean buildCache = !isHardwareAccelerated(); 2367 2368 for (int i = 0; i < count; i++) { 2369 final View child = children[i]; 2370 if ((child.mViewFlags & VISIBILITY_MASK) == VISIBLE) { 2371 child.setDrawingCacheEnabled(true); 2372 if (buildCache) { 2373 child.buildDrawingCache(true); 2374 } 2375 } 2376 } 2377 2378 mGroupFlags |= FLAG_CHILDREN_DRAWN_WITH_CACHE; 2379 } 2380 } 2381 2382 @Override 2383 protected void onAnimationEnd() { 2384 super.onAnimationEnd(); 2385 2386 // When this ViewGroup's animation ends, destroy the cache of the children 2387 if ((mGroupFlags & FLAG_ANIMATION_CACHE) == FLAG_ANIMATION_CACHE) { 2388 mGroupFlags &= ~FLAG_CHILDREN_DRAWN_WITH_CACHE; 2389 2390 if ((mPersistentDrawingCache & PERSISTENT_ANIMATION_CACHE) == 0) { 2391 setChildrenDrawingCacheEnabled(false); 2392 } 2393 } 2394 } 2395 2396 @Override 2397 Bitmap createSnapshot(Bitmap.Config quality, int backgroundColor, boolean skipChildren) { 2398 int count = mChildrenCount; 2399 int[] visibilities = null; 2400 2401 if (skipChildren) { 2402 visibilities = new int[count]; 2403 for (int i = 0; i < count; i++) { 2404 View child = getChildAt(i); 2405 visibilities[i] = child.getVisibility(); 2406 if (visibilities[i] == View.VISIBLE) { 2407 child.setVisibility(INVISIBLE); 2408 } 2409 } 2410 } 2411 2412 Bitmap b = super.createSnapshot(quality, backgroundColor, skipChildren); 2413 2414 if (skipChildren) { 2415 for (int i = 0; i < count; i++) { 2416 getChildAt(i).setVisibility(visibilities[i]); 2417 } 2418 } 2419 2420 return b; 2421 } 2422 2423 /** 2424 * {@inheritDoc} 2425 */ 2426 @Override 2427 protected void dispatchDraw(Canvas canvas) { 2428 final int count = mChildrenCount; 2429 final View[] children = mChildren; 2430 int flags = mGroupFlags; 2431 2432 if ((flags & FLAG_RUN_ANIMATION) != 0 && canAnimate()) { 2433 final boolean cache = (mGroupFlags & FLAG_ANIMATION_CACHE) == FLAG_ANIMATION_CACHE; 2434 2435 final boolean buildCache = !isHardwareAccelerated(); 2436 for (int i = 0; i < count; i++) { 2437 final View child = children[i]; 2438 if ((child.mViewFlags & VISIBILITY_MASK) == VISIBLE) { 2439 final LayoutParams params = child.getLayoutParams(); 2440 attachLayoutAnimationParameters(child, params, i, count); 2441 bindLayoutAnimation(child); 2442 if (cache) { 2443 child.setDrawingCacheEnabled(true); 2444 if (buildCache) { 2445 child.buildDrawingCache(true); 2446 } 2447 } 2448 } 2449 } 2450 2451 final LayoutAnimationController controller = mLayoutAnimationController; 2452 if (controller.willOverlap()) { 2453 mGroupFlags |= FLAG_OPTIMIZE_INVALIDATE; 2454 } 2455 2456 controller.start(); 2457 2458 mGroupFlags &= ~FLAG_RUN_ANIMATION; 2459 mGroupFlags &= ~FLAG_ANIMATION_DONE; 2460 2461 if (cache) { 2462 mGroupFlags |= FLAG_CHILDREN_DRAWN_WITH_CACHE; 2463 } 2464 2465 if (mAnimationListener != null) { 2466 mAnimationListener.onAnimationStart(controller.getAnimation()); 2467 } 2468 } 2469 2470 int saveCount = 0; 2471 final boolean clipToPadding = (flags & CLIP_TO_PADDING_MASK) == CLIP_TO_PADDING_MASK; 2472 if (clipToPadding) { 2473 saveCount = canvas.save(); 2474 canvas.clipRect(mScrollX + mPaddingLeft, mScrollY + mPaddingTop, 2475 mScrollX + mRight - mLeft - mPaddingRight, 2476 mScrollY + mBottom - mTop - mPaddingBottom); 2477 2478 } 2479 2480 // We will draw our child's animation, let's reset the flag 2481 mPrivateFlags &= ~DRAW_ANIMATION; 2482 mGroupFlags &= ~FLAG_INVALIDATE_REQUIRED; 2483 2484 boolean more = false; 2485 final long drawingTime = getDrawingTime(); 2486 2487 if ((flags & FLAG_USE_CHILD_DRAWING_ORDER) == 0) { 2488 for (int i = 0; i < count; i++) { 2489 final View child = children[i]; 2490 if ((child.mViewFlags & VISIBILITY_MASK) == VISIBLE || child.getAnimation() != null) { 2491 more |= drawChild(canvas, child, drawingTime); 2492 } 2493 } 2494 } else { 2495 for (int i = 0; i < count; i++) { 2496 final View child = children[getChildDrawingOrder(count, i)]; 2497 if ((child.mViewFlags & VISIBILITY_MASK) == VISIBLE || child.getAnimation() != null) { 2498 more |= drawChild(canvas, child, drawingTime); 2499 } 2500 } 2501 } 2502 2503 // Draw any disappearing views that have animations 2504 if (mDisappearingChildren != null) { 2505 final ArrayList<View> disappearingChildren = mDisappearingChildren; 2506 final int disappearingCount = disappearingChildren.size() - 1; 2507 // Go backwards -- we may delete as animations finish 2508 for (int i = disappearingCount; i >= 0; i--) { 2509 final View child = disappearingChildren.get(i); 2510 more |= drawChild(canvas, child, drawingTime); 2511 } 2512 } 2513 2514 if (clipToPadding) { 2515 canvas.restoreToCount(saveCount); 2516 } 2517 2518 // mGroupFlags might have been updated by drawChild() 2519 flags = mGroupFlags; 2520 2521 if ((flags & FLAG_INVALIDATE_REQUIRED) == FLAG_INVALIDATE_REQUIRED) { 2522 invalidate(true); 2523 } 2524 2525 if ((flags & FLAG_ANIMATION_DONE) == 0 && (flags & FLAG_NOTIFY_ANIMATION_LISTENER) == 0 && 2526 mLayoutAnimationController.isDone() && !more) { 2527 // We want to erase the drawing cache and notify the listener after the 2528 // next frame is drawn because one extra invalidate() is caused by 2529 // drawChild() after the animation is over 2530 mGroupFlags |= FLAG_NOTIFY_ANIMATION_LISTENER; 2531 final Runnable end = new Runnable() { 2532 public void run() { 2533 notifyAnimationListener(); 2534 } 2535 }; 2536 post(end); 2537 } 2538 } 2539 2540 /** 2541 * Returns the index of the child to draw for this iteration. Override this 2542 * if you want to change the drawing order of children. By default, it 2543 * returns i. 2544 * <p> 2545 * NOTE: In order for this method to be called, you must enable child ordering 2546 * first by calling {@link #setChildrenDrawingOrderEnabled(boolean)}. 2547 * 2548 * @param i The current iteration. 2549 * @return The index of the child to draw this iteration. 2550 * 2551 * @see #setChildrenDrawingOrderEnabled(boolean) 2552 * @see #isChildrenDrawingOrderEnabled() 2553 */ 2554 protected int getChildDrawingOrder(int childCount, int i) { 2555 return i; 2556 } 2557 2558 private void notifyAnimationListener() { 2559 mGroupFlags &= ~FLAG_NOTIFY_ANIMATION_LISTENER; 2560 mGroupFlags |= FLAG_ANIMATION_DONE; 2561 2562 if (mAnimationListener != null) { 2563 final Runnable end = new Runnable() { 2564 public void run() { 2565 mAnimationListener.onAnimationEnd(mLayoutAnimationController.getAnimation()); 2566 } 2567 }; 2568 post(end); 2569 } 2570 2571 if ((mGroupFlags & FLAG_ANIMATION_CACHE) == FLAG_ANIMATION_CACHE) { 2572 mGroupFlags &= ~FLAG_CHILDREN_DRAWN_WITH_CACHE; 2573 if ((mPersistentDrawingCache & PERSISTENT_ANIMATION_CACHE) == 0) { 2574 setChildrenDrawingCacheEnabled(false); 2575 } 2576 } 2577 2578 invalidate(true); 2579 } 2580 2581 /** 2582 * This method is used to cause children of this ViewGroup to restore or recreate their 2583 * display lists. It is called by getDisplayList() when the parent ViewGroup does not need 2584 * to recreate its own display list, which would happen if it went through the normal 2585 * draw/dispatchDraw mechanisms. 2586 * 2587 * @hide 2588 */ 2589 @Override 2590 protected void dispatchGetDisplayList() { 2591 final int count = mChildrenCount; 2592 final View[] children = mChildren; 2593 for (int i = 0; i < count; i++) { 2594 final View child = children[i]; 2595 if (((child.mViewFlags & VISIBILITY_MASK) == VISIBLE || child.getAnimation() != null) && 2596 child.hasStaticLayer()) { 2597 child.mRecreateDisplayList = (child.mPrivateFlags & INVALIDATED) == INVALIDATED; 2598 child.mPrivateFlags &= ~INVALIDATED; 2599 child.getDisplayList(); 2600 child.mRecreateDisplayList = false; 2601 } 2602 } 2603 } 2604 2605 /** 2606 * Draw one child of this View Group. This method is responsible for getting 2607 * the canvas in the right state. This includes clipping, translating so 2608 * that the child's scrolled origin is at 0, 0, and applying any animation 2609 * transformations. 2610 * 2611 * @param canvas The canvas on which to draw the child 2612 * @param child Who to draw 2613 * @param drawingTime The time at which draw is occuring 2614 * @return True if an invalidate() was issued 2615 */ 2616 protected boolean drawChild(Canvas canvas, View child, long drawingTime) { 2617 boolean more = false; 2618 2619 final int cl = child.mLeft; 2620 final int ct = child.mTop; 2621 final int cr = child.mRight; 2622 final int cb = child.mBottom; 2623 2624 final boolean childHasIdentityMatrix = child.hasIdentityMatrix(); 2625 2626 final int flags = mGroupFlags; 2627 2628 if ((flags & FLAG_CLEAR_TRANSFORMATION) == FLAG_CLEAR_TRANSFORMATION) { 2629 mChildTransformation.clear(); 2630 mGroupFlags &= ~FLAG_CLEAR_TRANSFORMATION; 2631 } 2632 2633 Transformation transformToApply = null; 2634 Transformation invalidationTransform; 2635 final Animation a = child.getAnimation(); 2636 boolean concatMatrix = false; 2637 2638 boolean scalingRequired = false; 2639 boolean caching; 2640 int layerType = mDrawLayers ? child.getLayerType() : LAYER_TYPE_NONE; 2641 2642 final boolean hardwareAccelerated = canvas.isHardwareAccelerated(); 2643 if ((flags & FLAG_CHILDREN_DRAWN_WITH_CACHE) == FLAG_CHILDREN_DRAWN_WITH_CACHE || 2644 (flags & FLAG_ALWAYS_DRAWN_WITH_CACHE) == FLAG_ALWAYS_DRAWN_WITH_CACHE) { 2645 caching = true; 2646 if (mAttachInfo != null) scalingRequired = mAttachInfo.mScalingRequired; 2647 } else { 2648 caching = (layerType != LAYER_TYPE_NONE) || hardwareAccelerated; 2649 } 2650 2651 if (a != null) { 2652 final boolean initialized = a.isInitialized(); 2653 if (!initialized) { 2654 a.initialize(cr - cl, cb - ct, getWidth(), getHeight()); 2655 a.initializeInvalidateRegion(0, 0, cr - cl, cb - ct); 2656 child.onAnimationStart(); 2657 } 2658 2659 more = a.getTransformation(drawingTime, mChildTransformation, 2660 scalingRequired ? mAttachInfo.mApplicationScale : 1f); 2661 if (scalingRequired && mAttachInfo.mApplicationScale != 1f) { 2662 if (mInvalidationTransformation == null) { 2663 mInvalidationTransformation = new Transformation(); 2664 } 2665 invalidationTransform = mInvalidationTransformation; 2666 a.getTransformation(drawingTime, invalidationTransform, 1f); 2667 } else { 2668 invalidationTransform = mChildTransformation; 2669 } 2670 transformToApply = mChildTransformation; 2671 2672 concatMatrix = a.willChangeTransformationMatrix(); 2673 2674 if (more) { 2675 if (!a.willChangeBounds()) { 2676 if ((flags & (FLAG_OPTIMIZE_INVALIDATE | FLAG_ANIMATION_DONE)) == 2677 FLAG_OPTIMIZE_INVALIDATE) { 2678 mGroupFlags |= FLAG_INVALIDATE_REQUIRED; 2679 } else if ((flags & FLAG_INVALIDATE_REQUIRED) == 0) { 2680 // The child need to draw an animation, potentially offscreen, so 2681 // make sure we do not cancel invalidate requests 2682 mPrivateFlags |= DRAW_ANIMATION; 2683 invalidate(cl, ct, cr, cb); 2684 } 2685 } else { 2686 if (mInvalidateRegion == null) { 2687 mInvalidateRegion = new RectF(); 2688 } 2689 final RectF region = mInvalidateRegion; 2690 a.getInvalidateRegion(0, 0, cr - cl, cb - ct, region, invalidationTransform); 2691 2692 // The child need to draw an animation, potentially offscreen, so 2693 // make sure we do not cancel invalidate requests 2694 mPrivateFlags |= DRAW_ANIMATION; 2695 2696 final int left = cl + (int) region.left; 2697 final int top = ct + (int) region.top; 2698 invalidate(left, top, left + (int) (region.width() + .5f), 2699 top + (int) (region.height() + .5f)); 2700 } 2701 } 2702 } else if ((flags & FLAG_SUPPORT_STATIC_TRANSFORMATIONS) == 2703 FLAG_SUPPORT_STATIC_TRANSFORMATIONS) { 2704 final boolean hasTransform = getChildStaticTransformation(child, mChildTransformation); 2705 if (hasTransform) { 2706 final int transformType = mChildTransformation.getTransformationType(); 2707 transformToApply = transformType != Transformation.TYPE_IDENTITY ? 2708 mChildTransformation : null; 2709 concatMatrix = (transformType & Transformation.TYPE_MATRIX) != 0; 2710 } 2711 } 2712 2713 concatMatrix |= !childHasIdentityMatrix; 2714 2715 // Sets the flag as early as possible to allow draw() implementations 2716 // to call invalidate() successfully when doing animations 2717 child.mPrivateFlags |= DRAWN; 2718 2719 if (!concatMatrix && canvas.quickReject(cl, ct, cr, cb, Canvas.EdgeType.BW) && 2720 (child.mPrivateFlags & DRAW_ANIMATION) == 0) { 2721 return more; 2722 } 2723 2724 float alpha = child.getAlpha(); 2725 // Bail out early if the view does not need to be drawn 2726 if (alpha <= ViewConfiguration.ALPHA_THRESHOLD && (child.mPrivateFlags & ALPHA_SET) == 0 && 2727 !(child instanceof SurfaceView)) { 2728 return more; 2729 } 2730 2731 if (hardwareAccelerated) { 2732 // Clear INVALIDATED flag to allow invalidation to occur during rendering, but 2733 // retain the flag's value temporarily in the mRecreateDisplayList flag 2734 child.mRecreateDisplayList = (child.mPrivateFlags & INVALIDATED) == INVALIDATED; 2735 child.mPrivateFlags &= ~INVALIDATED; 2736 } 2737 2738 child.computeScroll(); 2739 2740 final int sx = child.mScrollX; 2741 final int sy = child.mScrollY; 2742 2743 DisplayList displayList = null; 2744 Bitmap cache = null; 2745 boolean hasDisplayList = false; 2746 if (caching) { 2747 if (!hardwareAccelerated) { 2748 if (layerType != LAYER_TYPE_NONE) { 2749 layerType = LAYER_TYPE_SOFTWARE; 2750 child.buildDrawingCache(true); 2751 } 2752 cache = child.getDrawingCache(true); 2753 } else { 2754 switch (layerType) { 2755 case LAYER_TYPE_SOFTWARE: 2756 child.buildDrawingCache(true); 2757 cache = child.getDrawingCache(true); 2758 break; 2759 case LAYER_TYPE_NONE: 2760 // Delay getting the display list until animation-driven alpha values are 2761 // set up and possibly passed on to the view 2762 hasDisplayList = child.canHaveDisplayList(); 2763 break; 2764 } 2765 } 2766 } 2767 2768 final boolean hasNoCache = cache == null || hasDisplayList; 2769 final boolean offsetForScroll = cache == null && !hasDisplayList && 2770 layerType != LAYER_TYPE_HARDWARE; 2771 2772 final int restoreTo = canvas.save(); 2773 if (offsetForScroll) { 2774 canvas.translate(cl - sx, ct - sy); 2775 } else { 2776 canvas.translate(cl, ct); 2777 if (scalingRequired) { 2778 // mAttachInfo cannot be null, otherwise scalingRequired == false 2779 final float scale = 1.0f / mAttachInfo.mApplicationScale; 2780 canvas.scale(scale, scale); 2781 } 2782 } 2783 2784 if (transformToApply != null || alpha < 1.0f || !child.hasIdentityMatrix()) { 2785 if (transformToApply != null || !childHasIdentityMatrix) { 2786 int transX = 0; 2787 int transY = 0; 2788 2789 if (offsetForScroll) { 2790 transX = -sx; 2791 transY = -sy; 2792 } 2793 2794 if (transformToApply != null) { 2795 if (concatMatrix) { 2796 // Undo the scroll translation, apply the transformation matrix, 2797 // then redo the scroll translate to get the correct result. 2798 canvas.translate(-transX, -transY); 2799 canvas.concat(transformToApply.getMatrix()); 2800 canvas.translate(transX, transY); 2801 mGroupFlags |= FLAG_CLEAR_TRANSFORMATION; 2802 } 2803 2804 float transformAlpha = transformToApply.getAlpha(); 2805 if (transformAlpha < 1.0f) { 2806 alpha *= transformToApply.getAlpha(); 2807 mGroupFlags |= FLAG_CLEAR_TRANSFORMATION; 2808 } 2809 } 2810 2811 if (!childHasIdentityMatrix) { 2812 canvas.translate(-transX, -transY); 2813 canvas.concat(child.getMatrix()); 2814 canvas.translate(transX, transY); 2815 } 2816 } 2817 2818 if (alpha < 1.0f) { 2819 mGroupFlags |= FLAG_CLEAR_TRANSFORMATION; 2820 if (hasNoCache) { 2821 final int multipliedAlpha = (int) (255 * alpha); 2822 if (!child.onSetAlpha(multipliedAlpha)) { 2823 int layerFlags = Canvas.HAS_ALPHA_LAYER_SAVE_FLAG; 2824 if ((flags & FLAG_CLIP_CHILDREN) == FLAG_CLIP_CHILDREN || 2825 layerType != LAYER_TYPE_NONE) { 2826 layerFlags |= Canvas.CLIP_TO_LAYER_SAVE_FLAG; 2827 } 2828 if (layerType == LAYER_TYPE_NONE) { 2829 final int scrollX = hasDisplayList ? 0 : sx; 2830 final int scrollY = hasDisplayList ? 0 : sy; 2831 canvas.saveLayerAlpha(scrollX, scrollY, scrollX + cr - cl, 2832 scrollY + cb - ct, multipliedAlpha, layerFlags); 2833 } 2834 } else { 2835 // Alpha is handled by the child directly, clobber the layer's alpha 2836 child.mPrivateFlags |= ALPHA_SET; 2837 } 2838 } 2839 } 2840 } else if ((child.mPrivateFlags & ALPHA_SET) == ALPHA_SET) { 2841 child.onSetAlpha(255); 2842 child.mPrivateFlags &= ~ALPHA_SET; 2843 } 2844 2845 if ((flags & FLAG_CLIP_CHILDREN) == FLAG_CLIP_CHILDREN) { 2846 if (offsetForScroll) { 2847 canvas.clipRect(sx, sy, sx + (cr - cl), sy + (cb - ct)); 2848 } else { 2849 if (!scalingRequired || cache == null) { 2850 canvas.clipRect(0, 0, cr - cl, cb - ct); 2851 } else { 2852 canvas.clipRect(0, 0, cache.getWidth(), cache.getHeight()); 2853 } 2854 } 2855 } 2856 2857 if (hasDisplayList) { 2858 displayList = child.getDisplayList(); 2859 if (!displayList.isValid()) { 2860 // Uncommon, but possible. If a view is removed from the hierarchy during the call 2861 // to getDisplayList(), the display list will be marked invalid and we should not 2862 // try to use it again. 2863 displayList = null; 2864 hasDisplayList = false; 2865 } 2866 } 2867 2868 if (hasNoCache) { 2869 boolean layerRendered = false; 2870 if (layerType == LAYER_TYPE_HARDWARE) { 2871 final HardwareLayer layer = child.getHardwareLayer(); 2872 if (layer != null && layer.isValid()) { 2873 child.mLayerPaint.setAlpha((int) (alpha * 255)); 2874 ((HardwareCanvas) canvas).drawHardwareLayer(layer, 0, 0, child.mLayerPaint); 2875 layerRendered = true; 2876 } else { 2877 final int scrollX = hasDisplayList ? 0 : sx; 2878 final int scrollY = hasDisplayList ? 0 : sy; 2879 canvas.saveLayer(scrollX, scrollY, 2880 scrollX + cr - cl, scrollY + cb - ct, child.mLayerPaint, 2881 Canvas.HAS_ALPHA_LAYER_SAVE_FLAG | Canvas.CLIP_TO_LAYER_SAVE_FLAG); 2882 } 2883 } 2884 2885 if (!layerRendered) { 2886 if (!hasDisplayList) { 2887 // Fast path for layouts with no backgrounds 2888 if ((child.mPrivateFlags & SKIP_DRAW) == SKIP_DRAW) { 2889 if (ViewDebug.TRACE_HIERARCHY) { 2890 ViewDebug.trace(this, ViewDebug.HierarchyTraceType.DRAW); 2891 } 2892 child.mPrivateFlags &= ~DIRTY_MASK; 2893 child.dispatchDraw(canvas); 2894 } else { 2895 child.draw(canvas); 2896 } 2897 } else { 2898 child.mPrivateFlags &= ~DIRTY_MASK; 2899 ((HardwareCanvas) canvas).drawDisplayList(displayList, cr - cl, cb - ct, null); 2900 } 2901 } 2902 } else if (cache != null) { 2903 child.mPrivateFlags &= ~DIRTY_MASK; 2904 Paint cachePaint; 2905 2906 if (layerType == LAYER_TYPE_NONE) { 2907 cachePaint = mCachePaint; 2908 if (alpha < 1.0f) { 2909 cachePaint.setAlpha((int) (alpha * 255)); 2910 mGroupFlags |= FLAG_ALPHA_LOWER_THAN_ONE; 2911 } else if ((flags & FLAG_ALPHA_LOWER_THAN_ONE) == FLAG_ALPHA_LOWER_THAN_ONE) { 2912 cachePaint.setAlpha(255); 2913 mGroupFlags &= ~FLAG_ALPHA_LOWER_THAN_ONE; 2914 } 2915 } else { 2916 cachePaint = child.mLayerPaint; 2917 cachePaint.setAlpha((int) (alpha * 255)); 2918 } 2919 canvas.drawBitmap(cache, 0.0f, 0.0f, cachePaint); 2920 } 2921 2922 canvas.restoreToCount(restoreTo); 2923 2924 if (a != null && !more) { 2925 if (!hardwareAccelerated && !a.getFillAfter()) { 2926 child.onSetAlpha(255); 2927 } 2928 finishAnimatingView(child, a); 2929 } 2930 2931 if (more && hardwareAccelerated) { 2932 // invalidation is the trigger to recreate display lists, so if we're using 2933 // display lists to render, force an invalidate to allow the animation to 2934 // continue drawing another frame 2935 invalidate(true); 2936 if (a.hasAlpha() && (child.mPrivateFlags & ALPHA_SET) == ALPHA_SET) { 2937 // alpha animations should cause the child to recreate its display list 2938 child.invalidate(true); 2939 } 2940 } 2941 2942 child.mRecreateDisplayList = false; 2943 2944 return more; 2945 } 2946 2947 /** 2948 * 2949 * @param enabled True if children should be drawn with layers, false otherwise. 2950 * 2951 * @hide 2952 */ 2953 public void setChildrenLayersEnabled(boolean enabled) { 2954 if (enabled != mDrawLayers) { 2955 mDrawLayers = enabled; 2956 invalidate(true); 2957 2958 // We need to invalidate any child with a layer. For instance, 2959 // if a child is backed by a hardware layer and we disable layers 2960 // the child is marked as not dirty (flags cleared the last time 2961 // the child was drawn inside its layer.) However, that child might 2962 // never have created its own display list or have an obsolete 2963 // display list. By invalidating the child we ensure the display 2964 // list is in sync with the content of the hardware layer. 2965 for (int i = 0; i < mChildrenCount; i++) { 2966 View child = mChildren[i]; 2967 if (child.mLayerType != LAYER_TYPE_NONE) { 2968 child.invalidate(true); 2969 } 2970 } 2971 } 2972 } 2973 2974 /** 2975 * By default, children are clipped to their bounds before drawing. This 2976 * allows view groups to override this behavior for animations, etc. 2977 * 2978 * @param clipChildren true to clip children to their bounds, 2979 * false otherwise 2980 * @attr ref android.R.styleable#ViewGroup_clipChildren 2981 */ 2982 public void setClipChildren(boolean clipChildren) { 2983 setBooleanFlag(FLAG_CLIP_CHILDREN, clipChildren); 2984 } 2985 2986 /** 2987 * By default, children are clipped to the padding of the ViewGroup. This 2988 * allows view groups to override this behavior 2989 * 2990 * @param clipToPadding true to clip children to the padding of the 2991 * group, false otherwise 2992 * @attr ref android.R.styleable#ViewGroup_clipToPadding 2993 */ 2994 public void setClipToPadding(boolean clipToPadding) { 2995 setBooleanFlag(FLAG_CLIP_TO_PADDING, clipToPadding); 2996 } 2997 2998 /** 2999 * {@inheritDoc} 3000 */ 3001 @Override 3002 public void dispatchSetSelected(boolean selected) { 3003 final View[] children = mChildren; 3004 final int count = mChildrenCount; 3005 for (int i = 0; i < count; i++) { 3006 children[i].setSelected(selected); 3007 } 3008 } 3009 3010 /** 3011 * {@inheritDoc} 3012 */ 3013 @Override 3014 public void dispatchSetActivated(boolean activated) { 3015 final View[] children = mChildren; 3016 final int count = mChildrenCount; 3017 for (int i = 0; i < count; i++) { 3018 children[i].setActivated(activated); 3019 } 3020 } 3021 3022 @Override 3023 protected void dispatchSetPressed(boolean pressed) { 3024 final View[] children = mChildren; 3025 final int count = mChildrenCount; 3026 for (int i = 0; i < count; i++) { 3027 children[i].setPressed(pressed); 3028 } 3029 } 3030 3031 /** 3032 * When this property is set to true, this ViewGroup supports static transformations on 3033 * children; this causes 3034 * {@link #getChildStaticTransformation(View, android.view.animation.Transformation)} to be 3035 * invoked when a child is drawn. 3036 * 3037 * Any subclass overriding 3038 * {@link #getChildStaticTransformation(View, android.view.animation.Transformation)} should 3039 * set this property to true. 3040 * 3041 * @param enabled True to enable static transformations on children, false otherwise. 3042 * 3043 * @see #FLAG_SUPPORT_STATIC_TRANSFORMATIONS 3044 */ 3045 protected void setStaticTransformationsEnabled(boolean enabled) { 3046 setBooleanFlag(FLAG_SUPPORT_STATIC_TRANSFORMATIONS, enabled); 3047 } 3048 3049 /** 3050 * {@inheritDoc} 3051 * 3052 * @see #setStaticTransformationsEnabled(boolean) 3053 */ 3054 protected boolean getChildStaticTransformation(View child, Transformation t) { 3055 return false; 3056 } 3057 3058 /** 3059 * {@hide} 3060 */ 3061 @Override 3062 protected View findViewTraversal(int id) { 3063 if (id == mID) { 3064 return this; 3065 } 3066 3067 final View[] where = mChildren; 3068 final int len = mChildrenCount; 3069 3070 for (int i = 0; i < len; i++) { 3071 View v = where[i]; 3072 3073 if ((v.mPrivateFlags & IS_ROOT_NAMESPACE) == 0) { 3074 v = v.findViewById(id); 3075 3076 if (v != null) { 3077 return v; 3078 } 3079 } 3080 } 3081 3082 return null; 3083 } 3084 3085 /** 3086 * {@hide} 3087 */ 3088 @Override 3089 protected View findViewWithTagTraversal(Object tag) { 3090 if (tag != null && tag.equals(mTag)) { 3091 return this; 3092 } 3093 3094 final View[] where = mChildren; 3095 final int len = mChildrenCount; 3096 3097 for (int i = 0; i < len; i++) { 3098 View v = where[i]; 3099 3100 if ((v.mPrivateFlags & IS_ROOT_NAMESPACE) == 0) { 3101 v = v.findViewWithTag(tag); 3102 3103 if (v != null) { 3104 return v; 3105 } 3106 } 3107 } 3108 3109 return null; 3110 } 3111 3112 /** 3113 * {@hide} 3114 */ 3115 @Override 3116 protected View findViewByPredicateTraversal(Predicate<View> predicate, View childToSkip) { 3117 if (predicate.apply(this)) { 3118 return this; 3119 } 3120 3121 final View[] where = mChildren; 3122 final int len = mChildrenCount; 3123 3124 for (int i = 0; i < len; i++) { 3125 View v = where[i]; 3126 3127 if (v != childToSkip && (v.mPrivateFlags & IS_ROOT_NAMESPACE) == 0) { 3128 v = v.findViewByPredicate(predicate); 3129 3130 if (v != null) { 3131 return v; 3132 } 3133 } 3134 } 3135 3136 return null; 3137 } 3138 3139 /** 3140 * Adds a child view. If no layout parameters are already set on the child, the 3141 * default parameters for this ViewGroup are set on the child. 3142 * 3143 * @param child the child view to add 3144 * 3145 * @see #generateDefaultLayoutParams() 3146 */ 3147 public void addView(View child) { 3148 addView(child, -1); 3149 } 3150 3151 /** 3152 * Adds a child view. If no layout parameters are already set on the child, the 3153 * default parameters for this ViewGroup are set on the child. 3154 * 3155 * @param child the child view to add 3156 * @param index the position at which to add the child 3157 * 3158 * @see #generateDefaultLayoutParams() 3159 */ 3160 public void addView(View child, int index) { 3161 LayoutParams params = child.getLayoutParams(); 3162 if (params == null) { 3163 params = generateDefaultLayoutParams(); 3164 if (params == null) { 3165 throw new IllegalArgumentException("generateDefaultLayoutParams() cannot return null"); 3166 } 3167 } 3168 addView(child, index, params); 3169 } 3170 3171 /** 3172 * Adds a child view with this ViewGroup's default layout parameters and the 3173 * specified width and height. 3174 * 3175 * @param child the child view to add 3176 */ 3177 public void addView(View child, int width, int height) { 3178 final LayoutParams params = generateDefaultLayoutParams(); 3179 params.width = width; 3180 params.height = height; 3181 addView(child, -1, params); 3182 } 3183 3184 /** 3185 * Adds a child view with the specified layout parameters. 3186 * 3187 * @param child the child view to add 3188 * @param params the layout parameters to set on the child 3189 */ 3190 public void addView(View child, LayoutParams params) { 3191 addView(child, -1, params); 3192 } 3193 3194 /** 3195 * Adds a child view with the specified layout parameters. 3196 * 3197 * @param child the child view to add 3198 * @param index the position at which to add the child 3199 * @param params the layout parameters to set on the child 3200 */ 3201 public void addView(View child, int index, LayoutParams params) { 3202 if (DBG) { 3203 System.out.println(this + " addView"); 3204 } 3205 3206 // addViewInner() will call child.requestLayout() when setting the new LayoutParams 3207 // therefore, we call requestLayout() on ourselves before, so that the child's request 3208 // will be blocked at our level 3209 requestLayout(); 3210 invalidate(true); 3211 addViewInner(child, index, params, false); 3212 } 3213 3214 /** 3215 * {@inheritDoc} 3216 */ 3217 public void updateViewLayout(View view, ViewGroup.LayoutParams params) { 3218 if (!checkLayoutParams(params)) { 3219 throw new IllegalArgumentException("Invalid LayoutParams supplied to " + this); 3220 } 3221 if (view.mParent != this) { 3222 throw new IllegalArgumentException("Given view not a child of " + this); 3223 } 3224 view.setLayoutParams(params); 3225 } 3226 3227 /** 3228 * {@inheritDoc} 3229 */ 3230 protected boolean checkLayoutParams(ViewGroup.LayoutParams p) { 3231 return p != null; 3232 } 3233 3234 /** 3235 * Interface definition for a callback to be invoked when the hierarchy 3236 * within this view changed. The hierarchy changes whenever a child is added 3237 * to or removed from this view. 3238 */ 3239 public interface OnHierarchyChangeListener { 3240 /** 3241 * Called when a new child is added to a parent view. 3242 * 3243 * @param parent the view in which a child was added 3244 * @param child the new child view added in the hierarchy 3245 */ 3246 void onChildViewAdded(View parent, View child); 3247 3248 /** 3249 * Called when a child is removed from a parent view. 3250 * 3251 * @param parent the view from which the child was removed 3252 * @param child the child removed from the hierarchy 3253 */ 3254 void onChildViewRemoved(View parent, View child); 3255 } 3256 3257 /** 3258 * Register a callback to be invoked when a child is added to or removed 3259 * from this view. 3260 * 3261 * @param listener the callback to invoke on hierarchy change 3262 */ 3263 public void setOnHierarchyChangeListener(OnHierarchyChangeListener listener) { 3264 mOnHierarchyChangeListener = listener; 3265 } 3266 3267 /** 3268 * @hide 3269 */ 3270 protected void onViewAdded(View child) { 3271 if (mOnHierarchyChangeListener != null) { 3272 mOnHierarchyChangeListener.onChildViewAdded(this, child); 3273 } 3274 } 3275 3276 /** 3277 * @hide 3278 */ 3279 protected void onViewRemoved(View child) { 3280 if (mOnHierarchyChangeListener != null) { 3281 mOnHierarchyChangeListener.onChildViewRemoved(this, child); 3282 } 3283 } 3284 3285 /** 3286 * Adds a view during layout. This is useful if in your onLayout() method, 3287 * you need to add more views (as does the list view for example). 3288 * 3289 * If index is negative, it means put it at the end of the list. 3290 * 3291 * @param child the view to add to the group 3292 * @param index the index at which the child must be added 3293 * @param params the layout parameters to associate with the child 3294 * @return true if the child was added, false otherwise 3295 */ 3296 protected boolean addViewInLayout(View child, int index, LayoutParams params) { 3297 return addViewInLayout(child, index, params, false); 3298 } 3299 3300 /** 3301 * Adds a view during layout. This is useful if in your onLayout() method, 3302 * you need to add more views (as does the list view for example). 3303 * 3304 * If index is negative, it means put it at the end of the list. 3305 * 3306 * @param child the view to add to the group 3307 * @param index the index at which the child must be added 3308 * @param params the layout parameters to associate with the child 3309 * @param preventRequestLayout if true, calling this method will not trigger a 3310 * layout request on child 3311 * @return true if the child was added, false otherwise 3312 */ 3313 protected boolean addViewInLayout(View child, int index, LayoutParams params, 3314 boolean preventRequestLayout) { 3315 child.mParent = null; 3316 addViewInner(child, index, params, preventRequestLayout); 3317 child.mPrivateFlags = (child.mPrivateFlags & ~DIRTY_MASK) | DRAWN; 3318 return true; 3319 } 3320 3321 /** 3322 * Prevents the specified child to be laid out during the next layout pass. 3323 * 3324 * @param child the child on which to perform the cleanup 3325 */ 3326 protected void cleanupLayoutState(View child) { 3327 child.mPrivateFlags &= ~View.FORCE_LAYOUT; 3328 } 3329 3330 private void addViewInner(View child, int index, LayoutParams params, 3331 boolean preventRequestLayout) { 3332 3333 if (mTransition != null) { 3334 // Don't prevent other add transitions from completing, but cancel remove 3335 // transitions to let them complete the process before we add to the container 3336 mTransition.cancel(LayoutTransition.DISAPPEARING); 3337 } 3338 3339 if (child.getParent() != null) { 3340 throw new IllegalStateException("The specified child already has a parent. " + 3341 "You must call removeView() on the child's parent first."); 3342 } 3343 3344 if (mTransition != null) { 3345 mTransition.addChild(this, child); 3346 } 3347 3348 if (!checkLayoutParams(params)) { 3349 params = generateLayoutParams(params); 3350 } 3351 3352 if (preventRequestLayout) { 3353 child.mLayoutParams = params; 3354 } else { 3355 child.setLayoutParams(params); 3356 } 3357 3358 if (index < 0) { 3359 index = mChildrenCount; 3360 } 3361 3362 addInArray(child, index); 3363 3364 // tell our children 3365 if (preventRequestLayout) { 3366 child.assignParent(this); 3367 } else { 3368 child.mParent = this; 3369 } 3370 3371 if (child.hasFocus()) { 3372 requestChildFocus(child, child.findFocus()); 3373 } 3374 3375 AttachInfo ai = mAttachInfo; 3376 if (ai != null && (mGroupFlags & FLAG_PREVENT_DISPATCH_ATTACHED_TO_WINDOW) == 0) { 3377 boolean lastKeepOn = ai.mKeepScreenOn; 3378 ai.mKeepScreenOn = false; 3379 child.dispatchAttachedToWindow(mAttachInfo, (mViewFlags&VISIBILITY_MASK)); 3380 if (ai.mKeepScreenOn) { 3381 needGlobalAttributesUpdate(true); 3382 } 3383 ai.mKeepScreenOn = lastKeepOn; 3384 } 3385 3386 onViewAdded(child); 3387 3388 if ((child.mViewFlags & DUPLICATE_PARENT_STATE) == DUPLICATE_PARENT_STATE) { 3389 mGroupFlags |= FLAG_NOTIFY_CHILDREN_ON_DRAWABLE_STATE_CHANGE; 3390 } 3391 } 3392 3393 private void addInArray(View child, int index) { 3394 View[] children = mChildren; 3395 final int count = mChildrenCount; 3396 final int size = children.length; 3397 if (index == count) { 3398 if (size == count) { 3399 mChildren = new View[size + ARRAY_CAPACITY_INCREMENT]; 3400 System.arraycopy(children, 0, mChildren, 0, size); 3401 children = mChildren; 3402 } 3403 children[mChildrenCount++] = child; 3404 } else if (index < count) { 3405 if (size == count) { 3406 mChildren = new View[size + ARRAY_CAPACITY_INCREMENT]; 3407 System.arraycopy(children, 0, mChildren, 0, index); 3408 System.arraycopy(children, index, mChildren, index + 1, count - index); 3409 children = mChildren; 3410 } else { 3411 System.arraycopy(children, index, children, index + 1, count - index); 3412 } 3413 children[index] = child; 3414 mChildrenCount++; 3415 if (mLastTouchDownIndex >= index) { 3416 mLastTouchDownIndex++; 3417 } 3418 } else { 3419 throw new IndexOutOfBoundsException("index=" + index + " count=" + count); 3420 } 3421 } 3422 3423 // This method also sets the child's mParent to null 3424 private void removeFromArray(int index) { 3425 final View[] children = mChildren; 3426 if (!(mTransitioningViews != null && mTransitioningViews.contains(children[index]))) { 3427 children[index].mParent = null; 3428 } 3429 final int count = mChildrenCount; 3430 if (index == count - 1) { 3431 children[--mChildrenCount] = null; 3432 } else if (index >= 0 && index < count) { 3433 System.arraycopy(children, index + 1, children, index, count - index - 1); 3434 children[--mChildrenCount] = null; 3435 } else { 3436 throw new IndexOutOfBoundsException(); 3437 } 3438 if (mLastTouchDownIndex == index) { 3439 mLastTouchDownTime = 0; 3440 mLastTouchDownIndex = -1; 3441 } else if (mLastTouchDownIndex > index) { 3442 mLastTouchDownIndex--; 3443 } 3444 } 3445 3446 // This method also sets the children's mParent to null 3447 private void removeFromArray(int start, int count) { 3448 final View[] children = mChildren; 3449 final int childrenCount = mChildrenCount; 3450 3451 start = Math.max(0, start); 3452 final int end = Math.min(childrenCount, start + count); 3453 3454 if (start == end) { 3455 return; 3456 } 3457 3458 if (end == childrenCount) { 3459 for (int i = start; i < end; i++) { 3460 children[i].mParent = null; 3461 children[i] = null; 3462 } 3463 } else { 3464 for (int i = start; i < end; i++) { 3465 children[i].mParent = null; 3466 } 3467 3468 // Since we're looping above, we might as well do the copy, but is arraycopy() 3469 // faster than the extra 2 bounds checks we would do in the loop? 3470 System.arraycopy(children, end, children, start, childrenCount - end); 3471 3472 for (int i = childrenCount - (end - start); i < childrenCount; i++) { 3473 children[i] = null; 3474 } 3475 } 3476 3477 mChildrenCount -= (end - start); 3478 } 3479 3480 private void bindLayoutAnimation(View child) { 3481 Animation a = mLayoutAnimationController.getAnimationForView(child); 3482 child.setAnimation(a); 3483 } 3484 3485 /** 3486 * Subclasses should override this method to set layout animation 3487 * parameters on the supplied child. 3488 * 3489 * @param child the child to associate with animation parameters 3490 * @param params the child's layout parameters which hold the animation 3491 * parameters 3492 * @param index the index of the child in the view group 3493 * @param count the number of children in the view group 3494 */ 3495 protected void attachLayoutAnimationParameters(View child, 3496 LayoutParams params, int index, int count) { 3497 LayoutAnimationController.AnimationParameters animationParams = 3498 params.layoutAnimationParameters; 3499 if (animationParams == null) { 3500 animationParams = new LayoutAnimationController.AnimationParameters(); 3501 params.layoutAnimationParameters = animationParams; 3502 } 3503 3504 animationParams.count = count; 3505 animationParams.index = index; 3506 } 3507 3508 /** 3509 * {@inheritDoc} 3510 */ 3511 public void removeView(View view) { 3512 removeViewInternal(view); 3513 requestLayout(); 3514 invalidate(true); 3515 } 3516 3517 /** 3518 * Removes a view during layout. This is useful if in your onLayout() method, 3519 * you need to remove more views. 3520 * 3521 * @param view the view to remove from the group 3522 */ 3523 public void removeViewInLayout(View view) { 3524 removeViewInternal(view); 3525 } 3526 3527 /** 3528 * Removes a range of views during layout. This is useful if in your onLayout() method, 3529 * you need to remove more views. 3530 * 3531 * @param start the index of the first view to remove from the group 3532 * @param count the number of views to remove from the group 3533 */ 3534 public void removeViewsInLayout(int start, int count) { 3535 removeViewsInternal(start, count); 3536 } 3537 3538 /** 3539 * Removes the view at the specified position in the group. 3540 * 3541 * @param index the position in the group of the view to remove 3542 */ 3543 public void removeViewAt(int index) { 3544 removeViewInternal(index, getChildAt(index)); 3545 requestLayout(); 3546 invalidate(true); 3547 } 3548 3549 /** 3550 * Removes the specified range of views from the group. 3551 * 3552 * @param start the first position in the group of the range of views to remove 3553 * @param count the number of views to remove 3554 */ 3555 public void removeViews(int start, int count) { 3556 removeViewsInternal(start, count); 3557 requestLayout(); 3558 invalidate(true); 3559 } 3560 3561 private void removeViewInternal(View view) { 3562 final int index = indexOfChild(view); 3563 if (index >= 0) { 3564 removeViewInternal(index, view); 3565 } 3566 } 3567 3568 private void removeViewInternal(int index, View view) { 3569 3570 if (mTransition != null) { 3571 mTransition.removeChild(this, view); 3572 } 3573 3574 boolean clearChildFocus = false; 3575 if (view == mFocused) { 3576 view.clearFocusForRemoval(); 3577 clearChildFocus = true; 3578 } 3579 3580 if (view.getAnimation() != null || 3581 (mTransitioningViews != null && mTransitioningViews.contains(view))) { 3582 addDisappearingView(view); 3583 } else if (view.mAttachInfo != null) { 3584 view.dispatchDetachedFromWindow(); 3585 } 3586 3587 onViewRemoved(view); 3588 3589 needGlobalAttributesUpdate(false); 3590 3591 removeFromArray(index); 3592 3593 if (clearChildFocus) { 3594 clearChildFocus(view); 3595 } 3596 } 3597 3598 /** 3599 * Sets the LayoutTransition object for this ViewGroup. If the LayoutTransition object is 3600 * not null, changes in layout which occur because of children being added to or removed from 3601 * the ViewGroup will be animated according to the animations defined in that LayoutTransition 3602 * object. By default, the transition object is null (so layout changes are not animated). 3603 * 3604 * @param transition The LayoutTransition object that will animated changes in layout. A value 3605 * of <code>null</code> means no transition will run on layout changes. 3606 * @attr ref android.R.styleable#ViewGroup_animateLayoutChanges 3607 */ 3608 public void setLayoutTransition(LayoutTransition transition) { 3609 if (mTransition != null) { 3610 mTransition.removeTransitionListener(mLayoutTransitionListener); 3611 } 3612 mTransition = transition; 3613 if (mTransition != null) { 3614 mTransition.addTransitionListener(mLayoutTransitionListener); 3615 } 3616 } 3617 3618 /** 3619 * Gets the LayoutTransition object for this ViewGroup. If the LayoutTransition object is 3620 * not null, changes in layout which occur because of children being added to or removed from 3621 * the ViewGroup will be animated according to the animations defined in that LayoutTransition 3622 * object. By default, the transition object is null (so layout changes are not animated). 3623 * 3624 * @return LayoutTranstion The LayoutTransition object that will animated changes in layout. 3625 * A value of <code>null</code> means no transition will run on layout changes. 3626 */ 3627 public LayoutTransition getLayoutTransition() { 3628 return mTransition; 3629 } 3630 3631 private void removeViewsInternal(int start, int count) { 3632 final View focused = mFocused; 3633 final boolean detach = mAttachInfo != null; 3634 View clearChildFocus = null; 3635 3636 final View[] children = mChildren; 3637 final int end = start + count; 3638 3639 for (int i = start; i < end; i++) { 3640 final View view = children[i]; 3641 3642 if (mTransition != null) { 3643 mTransition.removeChild(this, view); 3644 } 3645 3646 if (view == focused) { 3647 view.clearFocusForRemoval(); 3648 clearChildFocus = view; 3649 } 3650 3651 if (view.getAnimation() != null || 3652 (mTransitioningViews != null && mTransitioningViews.contains(view))) { 3653 addDisappearingView(view); 3654 } else if (detach) { 3655 view.dispatchDetachedFromWindow(); 3656 } 3657 3658 needGlobalAttributesUpdate(false); 3659 3660 onViewRemoved(view); 3661 } 3662 3663 removeFromArray(start, count); 3664 3665 if (clearChildFocus != null) { 3666 clearChildFocus(clearChildFocus); 3667 } 3668 } 3669 3670 /** 3671 * Call this method to remove all child views from the 3672 * ViewGroup. 3673 */ 3674 public void removeAllViews() { 3675 removeAllViewsInLayout(); 3676 requestLayout(); 3677 invalidate(true); 3678 } 3679 3680 /** 3681 * Called by a ViewGroup subclass to remove child views from itself, 3682 * when it must first know its size on screen before it can calculate how many 3683 * child views it will render. An example is a Gallery or a ListView, which 3684 * may "have" 50 children, but actually only render the number of children 3685 * that can currently fit inside the object on screen. Do not call 3686 * this method unless you are extending ViewGroup and understand the 3687 * view measuring and layout pipeline. 3688 */ 3689 public void removeAllViewsInLayout() { 3690 final int count = mChildrenCount; 3691 if (count <= 0) { 3692 return; 3693 } 3694 3695 final View[] children = mChildren; 3696 mChildrenCount = 0; 3697 3698 final View focused = mFocused; 3699 final boolean detach = mAttachInfo != null; 3700 View clearChildFocus = null; 3701 3702 needGlobalAttributesUpdate(false); 3703 3704 for (int i = count - 1; i >= 0; i--) { 3705 final View view = children[i]; 3706 3707 if (mTransition != null) { 3708 mTransition.removeChild(this, view); 3709 } 3710 3711 if (view == focused) { 3712 view.clearFocusForRemoval(); 3713 clearChildFocus = view; 3714 } 3715 3716 if (view.getAnimation() != null || 3717 (mTransitioningViews != null && mTransitioningViews.contains(view))) { 3718 addDisappearingView(view); 3719 } else if (detach) { 3720 view.dispatchDetachedFromWindow(); 3721 } 3722 3723 onViewRemoved(view); 3724 3725 view.mParent = null; 3726 children[i] = null; 3727 } 3728 3729 if (clearChildFocus != null) { 3730 clearChildFocus(clearChildFocus); 3731 } 3732 } 3733 3734 /** 3735 * Finishes the removal of a detached view. This method will dispatch the detached from 3736 * window event and notify the hierarchy change listener. 3737 * 3738 * @param child the child to be definitely removed from the view hierarchy 3739 * @param animate if true and the view has an animation, the view is placed in the 3740 * disappearing views list, otherwise, it is detached from the window 3741 * 3742 * @see #attachViewToParent(View, int, android.view.ViewGroup.LayoutParams) 3743 * @see #detachAllViewsFromParent() 3744 * @see #detachViewFromParent(View) 3745 * @see #detachViewFromParent(int) 3746 */ 3747 protected void removeDetachedView(View child, boolean animate) { 3748 if (mTransition != null) { 3749 mTransition.removeChild(this, child); 3750 } 3751 3752 if (child == mFocused) { 3753 child.clearFocus(); 3754 } 3755 3756 if ((animate && child.getAnimation() != null) || 3757 (mTransitioningViews != null && mTransitioningViews.contains(child))) { 3758 addDisappearingView(child); 3759 } else if (child.mAttachInfo != null) { 3760 child.dispatchDetachedFromWindow(); 3761 } 3762 3763 onViewRemoved(child); 3764 } 3765 3766 /** 3767 * Attaches a view to this view group. Attaching a view assigns this group as the parent, 3768 * sets the layout parameters and puts the view in the list of children so it can be retrieved 3769 * by calling {@link #getChildAt(int)}. 3770 * 3771 * This method should be called only for view which were detached from their parent. 3772 * 3773 * @param child the child to attach 3774 * @param index the index at which the child should be attached 3775 * @param params the layout parameters of the child 3776 * 3777 * @see #removeDetachedView(View, boolean) 3778 * @see #detachAllViewsFromParent() 3779 * @see #detachViewFromParent(View) 3780 * @see #detachViewFromParent(int) 3781 */ 3782 protected void attachViewToParent(View child, int index, LayoutParams params) { 3783 child.mLayoutParams = params; 3784 3785 if (index < 0) { 3786 index = mChildrenCount; 3787 } 3788 3789 addInArray(child, index); 3790 3791 child.mParent = this; 3792 child.mPrivateFlags = (child.mPrivateFlags & ~DIRTY_MASK & ~DRAWING_CACHE_VALID) | 3793 DRAWN | INVALIDATED; 3794 this.mPrivateFlags |= INVALIDATED; 3795 3796 if (child.hasFocus()) { 3797 requestChildFocus(child, child.findFocus()); 3798 } 3799 } 3800 3801 /** 3802 * Detaches a view from its parent. Detaching a view should be temporary and followed 3803 * either by a call to {@link #attachViewToParent(View, int, android.view.ViewGroup.LayoutParams)} 3804 * or a call to {@link #removeDetachedView(View, boolean)}. When a view is detached, 3805 * its parent is null and cannot be retrieved by a call to {@link #getChildAt(int)}. 3806 * 3807 * @param child the child to detach 3808 * 3809 * @see #detachViewFromParent(int) 3810 * @see #detachViewsFromParent(int, int) 3811 * @see #detachAllViewsFromParent() 3812 * @see #attachViewToParent(View, int, android.view.ViewGroup.LayoutParams) 3813 * @see #removeDetachedView(View, boolean) 3814 */ 3815 protected void detachViewFromParent(View child) { 3816 removeFromArray(indexOfChild(child)); 3817 } 3818 3819 /** 3820 * Detaches a view from its parent. Detaching a view should be temporary and followed 3821 * either by a call to {@link #attachViewToParent(View, int, android.view.ViewGroup.LayoutParams)} 3822 * or a call to {@link #removeDetachedView(View, boolean)}. When a view is detached, 3823 * its parent is null and cannot be retrieved by a call to {@link #getChildAt(int)}. 3824 * 3825 * @param index the index of the child to detach 3826 * 3827 * @see #detachViewFromParent(View) 3828 * @see #detachAllViewsFromParent() 3829 * @see #detachViewsFromParent(int, int) 3830 * @see #attachViewToParent(View, int, android.view.ViewGroup.LayoutParams) 3831 * @see #removeDetachedView(View, boolean) 3832 */ 3833 protected void detachViewFromParent(int index) { 3834 removeFromArray(index); 3835 } 3836 3837 /** 3838 * Detaches a range of view from their parent. Detaching a view should be temporary and followed 3839 * either by a call to {@link #attachViewToParent(View, int, android.view.ViewGroup.LayoutParams)} 3840 * or a call to {@link #removeDetachedView(View, boolean)}. When a view is detached, its 3841 * parent is null and cannot be retrieved by a call to {@link #getChildAt(int)}. 3842 * 3843 * @param start the first index of the childrend range to detach 3844 * @param count the number of children to detach 3845 * 3846 * @see #detachViewFromParent(View) 3847 * @see #detachViewFromParent(int) 3848 * @see #detachAllViewsFromParent() 3849 * @see #attachViewToParent(View, int, android.view.ViewGroup.LayoutParams) 3850 * @see #removeDetachedView(View, boolean) 3851 */ 3852 protected void detachViewsFromParent(int start, int count) { 3853 removeFromArray(start, count); 3854 } 3855 3856 /** 3857 * Detaches all views from the parent. Detaching a view should be temporary and followed 3858 * either by a call to {@link #attachViewToParent(View, int, android.view.ViewGroup.LayoutParams)} 3859 * or a call to {@link #removeDetachedView(View, boolean)}. When a view is detached, 3860 * its parent is null and cannot be retrieved by a call to {@link #getChildAt(int)}. 3861 * 3862 * @see #detachViewFromParent(View) 3863 * @see #detachViewFromParent(int) 3864 * @see #detachViewsFromParent(int, int) 3865 * @see #attachViewToParent(View, int, android.view.ViewGroup.LayoutParams) 3866 * @see #removeDetachedView(View, boolean) 3867 */ 3868 protected void detachAllViewsFromParent() { 3869 final int count = mChildrenCount; 3870 if (count <= 0) { 3871 return; 3872 } 3873 3874 final View[] children = mChildren; 3875 mChildrenCount = 0; 3876 3877 for (int i = count - 1; i >= 0; i--) { 3878 children[i].mParent = null; 3879 children[i] = null; 3880 } 3881 } 3882 3883 /** 3884 * Don't call or override this method. It is used for the implementation of 3885 * the view hierarchy. 3886 */ 3887 public final void invalidateChild(View child, final Rect dirty) { 3888 if (ViewDebug.TRACE_HIERARCHY) { 3889 ViewDebug.trace(this, ViewDebug.HierarchyTraceType.INVALIDATE_CHILD); 3890 } 3891 3892 ViewParent parent = this; 3893 3894 final AttachInfo attachInfo = mAttachInfo; 3895 if (attachInfo != null) { 3896 // If the child is drawing an animation, we want to copy this flag onto 3897 // ourselves and the parent to make sure the invalidate request goes 3898 // through 3899 final boolean drawAnimation = (child.mPrivateFlags & DRAW_ANIMATION) == DRAW_ANIMATION; 3900 3901 if (dirty == null) { 3902 if (child.mLayerType != LAYER_TYPE_NONE) { 3903 mPrivateFlags |= INVALIDATED; 3904 mPrivateFlags &= ~DRAWING_CACHE_VALID; 3905 child.mLocalDirtyRect.setEmpty(); 3906 } 3907 do { 3908 View view = null; 3909 if (parent instanceof View) { 3910 view = (View) parent; 3911 if (view.mLayerType != LAYER_TYPE_NONE) { 3912 view.mLocalDirtyRect.setEmpty(); 3913 if (view.getParent() instanceof View) { 3914 final View grandParent = (View) view.getParent(); 3915 grandParent.mPrivateFlags |= INVALIDATED; 3916 grandParent.mPrivateFlags &= ~DRAWING_CACHE_VALID; 3917 } 3918 } 3919 if ((view.mPrivateFlags & DIRTY_MASK) != 0) { 3920 // already marked dirty - we're done 3921 break; 3922 } 3923 } 3924 3925 if (drawAnimation) { 3926 if (view != null) { 3927 view.mPrivateFlags |= DRAW_ANIMATION; 3928 } else if (parent instanceof ViewRootImpl) { 3929 ((ViewRootImpl) parent).mIsAnimating = true; 3930 } 3931 } 3932 3933 if (parent instanceof ViewRootImpl) { 3934 ((ViewRootImpl) parent).invalidate(); 3935 parent = null; 3936 } else if (view != null) { 3937 if ((view.mPrivateFlags & DRAWN) == DRAWN || 3938 (view.mPrivateFlags & DRAWING_CACHE_VALID) == DRAWING_CACHE_VALID) { 3939 view.mPrivateFlags &= ~DRAWING_CACHE_VALID; 3940 view.mPrivateFlags |= DIRTY; 3941 parent = view.mParent; 3942 } else { 3943 parent = null; 3944 } 3945 } 3946 } while (parent != null); 3947 } else { 3948 // Check whether the child that requests the invalidate is fully opaque 3949 final boolean isOpaque = child.isOpaque() && !drawAnimation && 3950 child.getAnimation() == null; 3951 // Mark the child as dirty, using the appropriate flag 3952 // Make sure we do not set both flags at the same time 3953 int opaqueFlag = isOpaque ? DIRTY_OPAQUE : DIRTY; 3954 3955 if (child.mLayerType != LAYER_TYPE_NONE) { 3956 mPrivateFlags |= INVALIDATED; 3957 mPrivateFlags &= ~DRAWING_CACHE_VALID; 3958 child.mLocalDirtyRect.union(dirty); 3959 } 3960 3961 final int[] location = attachInfo.mInvalidateChildLocation; 3962 location[CHILD_LEFT_INDEX] = child.mLeft; 3963 location[CHILD_TOP_INDEX] = child.mTop; 3964 Matrix childMatrix = child.getMatrix(); 3965 if (!childMatrix.isIdentity()) { 3966 RectF boundingRect = attachInfo.mTmpTransformRect; 3967 boundingRect.set(dirty); 3968 //boundingRect.inset(-0.5f, -0.5f); 3969 childMatrix.mapRect(boundingRect); 3970 dirty.set((int) (boundingRect.left - 0.5f), 3971 (int) (boundingRect.top - 0.5f), 3972 (int) (boundingRect.right + 0.5f), 3973 (int) (boundingRect.bottom + 0.5f)); 3974 } 3975 3976 do { 3977 View view = null; 3978 if (parent instanceof View) { 3979 view = (View) parent; 3980 if (view.mLayerType != LAYER_TYPE_NONE && 3981 view.getParent() instanceof View) { 3982 final View grandParent = (View) view.getParent(); 3983 grandParent.mPrivateFlags |= INVALIDATED; 3984 grandParent.mPrivateFlags &= ~DRAWING_CACHE_VALID; 3985 } 3986 } 3987 3988 if (drawAnimation) { 3989 if (view != null) { 3990 view.mPrivateFlags |= DRAW_ANIMATION; 3991 } else if (parent instanceof ViewRootImpl) { 3992 ((ViewRootImpl) parent).mIsAnimating = true; 3993 } 3994 } 3995 3996 // If the parent is dirty opaque or not dirty, mark it dirty with the opaque 3997 // flag coming from the child that initiated the invalidate 3998 if (view != null) { 3999 if ((view.mViewFlags & FADING_EDGE_MASK) != 0 && 4000 view.getSolidColor() == 0) { 4001 opaqueFlag = DIRTY; 4002 } 4003 if ((view.mPrivateFlags & DIRTY_MASK) != DIRTY) { 4004 view.mPrivateFlags = (view.mPrivateFlags & ~DIRTY_MASK) | opaqueFlag; 4005 } 4006 } 4007 4008 parent = parent.invalidateChildInParent(location, dirty); 4009 if (view != null) { 4010 // Account for transform on current parent 4011 Matrix m = view.getMatrix(); 4012 if (!m.isIdentity()) { 4013 RectF boundingRect = attachInfo.mTmpTransformRect; 4014 boundingRect.set(dirty); 4015 m.mapRect(boundingRect); 4016 dirty.set((int) boundingRect.left, (int) boundingRect.top, 4017 (int) (boundingRect.right + 0.5f), 4018 (int) (boundingRect.bottom + 0.5f)); 4019 } 4020 } 4021 } while (parent != null); 4022 } 4023 } 4024 } 4025 4026 /** 4027 * Don't call or override this method. It is used for the implementation of 4028 * the view hierarchy. 4029 * 4030 * This implementation returns null if this ViewGroup does not have a parent, 4031 * if this ViewGroup is already fully invalidated or if the dirty rectangle 4032 * does not intersect with this ViewGroup's bounds. 4033 */ 4034 public ViewParent invalidateChildInParent(final int[] location, final Rect dirty) { 4035 if (ViewDebug.TRACE_HIERARCHY) { 4036 ViewDebug.trace(this, ViewDebug.HierarchyTraceType.INVALIDATE_CHILD_IN_PARENT); 4037 } 4038 4039 if ((mPrivateFlags & DRAWN) == DRAWN || 4040 (mPrivateFlags & DRAWING_CACHE_VALID) == DRAWING_CACHE_VALID) { 4041 if ((mGroupFlags & (FLAG_OPTIMIZE_INVALIDATE | FLAG_ANIMATION_DONE)) != 4042 FLAG_OPTIMIZE_INVALIDATE) { 4043 dirty.offset(location[CHILD_LEFT_INDEX] - mScrollX, 4044 location[CHILD_TOP_INDEX] - mScrollY); 4045 4046 final int left = mLeft; 4047 final int top = mTop; 4048 4049 if ((mGroupFlags & FLAG_CLIP_CHILDREN) != FLAG_CLIP_CHILDREN || 4050 dirty.intersect(0, 0, mRight - left, mBottom - top) || 4051 (mPrivateFlags & DRAW_ANIMATION) == DRAW_ANIMATION) { 4052 mPrivateFlags &= ~DRAWING_CACHE_VALID; 4053 4054 location[CHILD_LEFT_INDEX] = left; 4055 location[CHILD_TOP_INDEX] = top; 4056 4057 if (mLayerType != LAYER_TYPE_NONE) { 4058 mLocalDirtyRect.union(dirty); 4059 } 4060 4061 return mParent; 4062 } 4063 } else { 4064 mPrivateFlags &= ~DRAWN & ~DRAWING_CACHE_VALID; 4065 4066 location[CHILD_LEFT_INDEX] = mLeft; 4067 location[CHILD_TOP_INDEX] = mTop; 4068 if ((mGroupFlags & FLAG_CLIP_CHILDREN) == FLAG_CLIP_CHILDREN) { 4069 dirty.set(0, 0, mRight - mLeft, mBottom - mTop); 4070 } else { 4071 // in case the dirty rect extends outside the bounds of this container 4072 dirty.union(0, 0, mRight - mLeft, mBottom - mTop); 4073 } 4074 4075 if (mLayerType != LAYER_TYPE_NONE) { 4076 mLocalDirtyRect.union(dirty); 4077 } 4078 4079 return mParent; 4080 } 4081 } 4082 4083 return null; 4084 } 4085 4086 /** 4087 * Offset a rectangle that is in a descendant's coordinate 4088 * space into our coordinate space. 4089 * @param descendant A descendant of this view 4090 * @param rect A rectangle defined in descendant's coordinate space. 4091 */ 4092 public final void offsetDescendantRectToMyCoords(View descendant, Rect rect) { 4093 offsetRectBetweenParentAndChild(descendant, rect, true, false); 4094 } 4095 4096 /** 4097 * Offset a rectangle that is in our coordinate space into an ancestor's 4098 * coordinate space. 4099 * @param descendant A descendant of this view 4100 * @param rect A rectangle defined in descendant's coordinate space. 4101 */ 4102 public final void offsetRectIntoDescendantCoords(View descendant, Rect rect) { 4103 offsetRectBetweenParentAndChild(descendant, rect, false, false); 4104 } 4105 4106 /** 4107 * Helper method that offsets a rect either from parent to descendant or 4108 * descendant to parent. 4109 */ 4110 void offsetRectBetweenParentAndChild(View descendant, Rect rect, 4111 boolean offsetFromChildToParent, boolean clipToBounds) { 4112 4113 // already in the same coord system :) 4114 if (descendant == this) { 4115 return; 4116 } 4117 4118 ViewParent theParent = descendant.mParent; 4119 4120 // search and offset up to the parent 4121 while ((theParent != null) 4122 && (theParent instanceof View) 4123 && (theParent != this)) { 4124 4125 if (offsetFromChildToParent) { 4126 rect.offset(descendant.mLeft - descendant.mScrollX, 4127 descendant.mTop - descendant.mScrollY); 4128 if (clipToBounds) { 4129 View p = (View) theParent; 4130 rect.intersect(0, 0, p.mRight - p.mLeft, p.mBottom - p.mTop); 4131 } 4132 } else { 4133 if (clipToBounds) { 4134 View p = (View) theParent; 4135 rect.intersect(0, 0, p.mRight - p.mLeft, p.mBottom - p.mTop); 4136 } 4137 rect.offset(descendant.mScrollX - descendant.mLeft, 4138 descendant.mScrollY - descendant.mTop); 4139 } 4140 4141 descendant = (View) theParent; 4142 theParent = descendant.mParent; 4143 } 4144 4145 // now that we are up to this view, need to offset one more time 4146 // to get into our coordinate space 4147 if (theParent == this) { 4148 if (offsetFromChildToParent) { 4149 rect.offset(descendant.mLeft - descendant.mScrollX, 4150 descendant.mTop - descendant.mScrollY); 4151 } else { 4152 rect.offset(descendant.mScrollX - descendant.mLeft, 4153 descendant.mScrollY - descendant.mTop); 4154 } 4155 } else { 4156 throw new IllegalArgumentException("parameter must be a descendant of this view"); 4157 } 4158 } 4159 4160 /** 4161 * Offset the vertical location of all children of this view by the specified number of pixels. 4162 * 4163 * @param offset the number of pixels to offset 4164 * 4165 * @hide 4166 */ 4167 public void offsetChildrenTopAndBottom(int offset) { 4168 final int count = mChildrenCount; 4169 final View[] children = mChildren; 4170 4171 for (int i = 0; i < count; i++) { 4172 final View v = children[i]; 4173 v.mTop += offset; 4174 v.mBottom += offset; 4175 } 4176 } 4177 4178 /** 4179 * {@inheritDoc} 4180 */ 4181 public boolean getChildVisibleRect(View child, Rect r, android.graphics.Point offset) { 4182 int dx = child.mLeft - mScrollX; 4183 int dy = child.mTop - mScrollY; 4184 if (offset != null) { 4185 offset.x += dx; 4186 offset.y += dy; 4187 } 4188 r.offset(dx, dy); 4189 return r.intersect(0, 0, mRight - mLeft, mBottom - mTop) && 4190 (mParent == null || mParent.getChildVisibleRect(this, r, offset)); 4191 } 4192 4193 /** 4194 * {@inheritDoc} 4195 */ 4196 @Override 4197 public final void layout(int l, int t, int r, int b) { 4198 if (mTransition == null || !mTransition.isChangingLayout()) { 4199 super.layout(l, t, r, b); 4200 } else { 4201 // record the fact that we noop'd it; request layout when transition finishes 4202 mLayoutSuppressed = true; 4203 } 4204 } 4205 4206 /** 4207 * {@inheritDoc} 4208 */ 4209 @Override 4210 protected abstract void onLayout(boolean changed, 4211 int l, int t, int r, int b); 4212 4213 /** 4214 * Indicates whether the view group has the ability to animate its children 4215 * after the first layout. 4216 * 4217 * @return true if the children can be animated, false otherwise 4218 */ 4219 protected boolean canAnimate() { 4220 return mLayoutAnimationController != null; 4221 } 4222 4223 /** 4224 * Runs the layout animation. Calling this method triggers a relayout of 4225 * this view group. 4226 */ 4227 public void startLayoutAnimation() { 4228 if (mLayoutAnimationController != null) { 4229 mGroupFlags |= FLAG_RUN_ANIMATION; 4230 requestLayout(); 4231 } 4232 } 4233 4234 /** 4235 * Schedules the layout animation to be played after the next layout pass 4236 * of this view group. This can be used to restart the layout animation 4237 * when the content of the view group changes or when the activity is 4238 * paused and resumed. 4239 */ 4240 public void scheduleLayoutAnimation() { 4241 mGroupFlags |= FLAG_RUN_ANIMATION; 4242 } 4243 4244 /** 4245 * Sets the layout animation controller used to animate the group's 4246 * children after the first layout. 4247 * 4248 * @param controller the animation controller 4249 */ 4250 public void setLayoutAnimation(LayoutAnimationController controller) { 4251 mLayoutAnimationController = controller; 4252 if (mLayoutAnimationController != null) { 4253 mGroupFlags |= FLAG_RUN_ANIMATION; 4254 } 4255 } 4256 4257 /** 4258 * Returns the layout animation controller used to animate the group's 4259 * children. 4260 * 4261 * @return the current animation controller 4262 */ 4263 public LayoutAnimationController getLayoutAnimation() { 4264 return mLayoutAnimationController; 4265 } 4266 4267 /** 4268 * Indicates whether the children's drawing cache is used during a layout 4269 * animation. By default, the drawing cache is enabled but this will prevent 4270 * nested layout animations from working. To nest animations, you must disable 4271 * the cache. 4272 * 4273 * @return true if the animation cache is enabled, false otherwise 4274 * 4275 * @see #setAnimationCacheEnabled(boolean) 4276 * @see View#setDrawingCacheEnabled(boolean) 4277 */ 4278 @ViewDebug.ExportedProperty 4279 public boolean isAnimationCacheEnabled() { 4280 return (mGroupFlags & FLAG_ANIMATION_CACHE) == FLAG_ANIMATION_CACHE; 4281 } 4282 4283 /** 4284 * Enables or disables the children's drawing cache during a layout animation. 4285 * By default, the drawing cache is enabled but this will prevent nested 4286 * layout animations from working. To nest animations, you must disable the 4287 * cache. 4288 * 4289 * @param enabled true to enable the animation cache, false otherwise 4290 * 4291 * @see #isAnimationCacheEnabled() 4292 * @see View#setDrawingCacheEnabled(boolean) 4293 */ 4294 public void setAnimationCacheEnabled(boolean enabled) { 4295 setBooleanFlag(FLAG_ANIMATION_CACHE, enabled); 4296 } 4297 4298 /** 4299 * Indicates whether this ViewGroup will always try to draw its children using their 4300 * drawing cache. By default this property is enabled. 4301 * 4302 * @return true if the animation cache is enabled, false otherwise 4303 * 4304 * @see #setAlwaysDrawnWithCacheEnabled(boolean) 4305 * @see #setChildrenDrawnWithCacheEnabled(boolean) 4306 * @see View#setDrawingCacheEnabled(boolean) 4307 */ 4308 @ViewDebug.ExportedProperty(category = "drawing") 4309 public boolean isAlwaysDrawnWithCacheEnabled() { 4310 return (mGroupFlags & FLAG_ALWAYS_DRAWN_WITH_CACHE) == FLAG_ALWAYS_DRAWN_WITH_CACHE; 4311 } 4312 4313 /** 4314 * Indicates whether this ViewGroup will always try to draw its children using their 4315 * drawing cache. This property can be set to true when the cache rendering is 4316 * slightly different from the children's normal rendering. Renderings can be different, 4317 * for instance, when the cache's quality is set to low. 4318 * 4319 * When this property is disabled, the ViewGroup will use the drawing cache of its 4320 * children only when asked to. It's usually the task of subclasses to tell ViewGroup 4321 * when to start using the drawing cache and when to stop using it. 4322 * 4323 * @param always true to always draw with the drawing cache, false otherwise 4324 * 4325 * @see #isAlwaysDrawnWithCacheEnabled() 4326 * @see #setChildrenDrawnWithCacheEnabled(boolean) 4327 * @see View#setDrawingCacheEnabled(boolean) 4328 * @see View#setDrawingCacheQuality(int) 4329 */ 4330 public void setAlwaysDrawnWithCacheEnabled(boolean always) { 4331 setBooleanFlag(FLAG_ALWAYS_DRAWN_WITH_CACHE, always); 4332 } 4333 4334 /** 4335 * Indicates whether the ViewGroup is currently drawing its children using 4336 * their drawing cache. 4337 * 4338 * @return true if children should be drawn with their cache, false otherwise 4339 * 4340 * @see #setAlwaysDrawnWithCacheEnabled(boolean) 4341 * @see #setChildrenDrawnWithCacheEnabled(boolean) 4342 */ 4343 @ViewDebug.ExportedProperty(category = "drawing") 4344 protected boolean isChildrenDrawnWithCacheEnabled() { 4345 return (mGroupFlags & FLAG_CHILDREN_DRAWN_WITH_CACHE) == FLAG_CHILDREN_DRAWN_WITH_CACHE; 4346 } 4347 4348 /** 4349 * Tells the ViewGroup to draw its children using their drawing cache. This property 4350 * is ignored when {@link #isAlwaysDrawnWithCacheEnabled()} is true. A child's drawing cache 4351 * will be used only if it has been enabled. 4352 * 4353 * Subclasses should call this method to start and stop using the drawing cache when 4354 * they perform performance sensitive operations, like scrolling or animating. 4355 * 4356 * @param enabled true if children should be drawn with their cache, false otherwise 4357 * 4358 * @see #setAlwaysDrawnWithCacheEnabled(boolean) 4359 * @see #isChildrenDrawnWithCacheEnabled() 4360 */ 4361 protected void setChildrenDrawnWithCacheEnabled(boolean enabled) { 4362 setBooleanFlag(FLAG_CHILDREN_DRAWN_WITH_CACHE, enabled); 4363 } 4364 4365 /** 4366 * Indicates whether the ViewGroup is drawing its children in the order defined by 4367 * {@link #getChildDrawingOrder(int, int)}. 4368 * 4369 * @return true if children drawing order is defined by {@link #getChildDrawingOrder(int, int)}, 4370 * false otherwise 4371 * 4372 * @see #setChildrenDrawingOrderEnabled(boolean) 4373 * @see #getChildDrawingOrder(int, int) 4374 */ 4375 @ViewDebug.ExportedProperty(category = "drawing") 4376 protected boolean isChildrenDrawingOrderEnabled() { 4377 return (mGroupFlags & FLAG_USE_CHILD_DRAWING_ORDER) == FLAG_USE_CHILD_DRAWING_ORDER; 4378 } 4379 4380 /** 4381 * Tells the ViewGroup whether to draw its children in the order defined by the method 4382 * {@link #getChildDrawingOrder(int, int)}. 4383 * 4384 * @param enabled true if the order of the children when drawing is determined by 4385 * {@link #getChildDrawingOrder(int, int)}, false otherwise 4386 * 4387 * @see #isChildrenDrawingOrderEnabled() 4388 * @see #getChildDrawingOrder(int, int) 4389 */ 4390 protected void setChildrenDrawingOrderEnabled(boolean enabled) { 4391 setBooleanFlag(FLAG_USE_CHILD_DRAWING_ORDER, enabled); 4392 } 4393 4394 private void setBooleanFlag(int flag, boolean value) { 4395 if (value) { 4396 mGroupFlags |= flag; 4397 } else { 4398 mGroupFlags &= ~flag; 4399 } 4400 } 4401 4402 /** 4403 * Returns an integer indicating what types of drawing caches are kept in memory. 4404 * 4405 * @see #setPersistentDrawingCache(int) 4406 * @see #setAnimationCacheEnabled(boolean) 4407 * 4408 * @return one or a combination of {@link #PERSISTENT_NO_CACHE}, 4409 * {@link #PERSISTENT_ANIMATION_CACHE}, {@link #PERSISTENT_SCROLLING_CACHE} 4410 * and {@link #PERSISTENT_ALL_CACHES} 4411 */ 4412 @ViewDebug.ExportedProperty(category = "drawing", mapping = { 4413 @ViewDebug.IntToString(from = PERSISTENT_NO_CACHE, to = "NONE"), 4414 @ViewDebug.IntToString(from = PERSISTENT_ANIMATION_CACHE, to = "ANIMATION"), 4415 @ViewDebug.IntToString(from = PERSISTENT_SCROLLING_CACHE, to = "SCROLLING"), 4416 @ViewDebug.IntToString(from = PERSISTENT_ALL_CACHES, to = "ALL") 4417 }) 4418 public int getPersistentDrawingCache() { 4419 return mPersistentDrawingCache; 4420 } 4421 4422 /** 4423 * Indicates what types of drawing caches should be kept in memory after 4424 * they have been created. 4425 * 4426 * @see #getPersistentDrawingCache() 4427 * @see #setAnimationCacheEnabled(boolean) 4428 * 4429 * @param drawingCacheToKeep one or a combination of {@link #PERSISTENT_NO_CACHE}, 4430 * {@link #PERSISTENT_ANIMATION_CACHE}, {@link #PERSISTENT_SCROLLING_CACHE} 4431 * and {@link #PERSISTENT_ALL_CACHES} 4432 */ 4433 public void setPersistentDrawingCache(int drawingCacheToKeep) { 4434 mPersistentDrawingCache = drawingCacheToKeep & PERSISTENT_ALL_CACHES; 4435 } 4436 4437 /** 4438 * Returns a new set of layout parameters based on the supplied attributes set. 4439 * 4440 * @param attrs the attributes to build the layout parameters from 4441 * 4442 * @return an instance of {@link android.view.ViewGroup.LayoutParams} or one 4443 * of its descendants 4444 */ 4445 public LayoutParams generateLayoutParams(AttributeSet attrs) { 4446 return new LayoutParams(getContext(), attrs); 4447 } 4448 4449 /** 4450 * Returns a safe set of layout parameters based on the supplied layout params. 4451 * When a ViewGroup is passed a View whose layout params do not pass the test of 4452 * {@link #checkLayoutParams(android.view.ViewGroup.LayoutParams)}, this method 4453 * is invoked. This method should return a new set of layout params suitable for 4454 * this ViewGroup, possibly by copying the appropriate attributes from the 4455 * specified set of layout params. 4456 * 4457 * @param p The layout parameters to convert into a suitable set of layout parameters 4458 * for this ViewGroup. 4459 * 4460 * @return an instance of {@link android.view.ViewGroup.LayoutParams} or one 4461 * of its descendants 4462 */ 4463 protected LayoutParams generateLayoutParams(ViewGroup.LayoutParams p) { 4464 return p; 4465 } 4466 4467 /** 4468 * Returns a set of default layout parameters. These parameters are requested 4469 * when the View passed to {@link #addView(View)} has no layout parameters 4470 * already set. If null is returned, an exception is thrown from addView. 4471 * 4472 * @return a set of default layout parameters or null 4473 */ 4474 protected LayoutParams generateDefaultLayoutParams() { 4475 return new LayoutParams(LayoutParams.WRAP_CONTENT, LayoutParams.WRAP_CONTENT); 4476 } 4477 4478 /** 4479 * @hide 4480 */ 4481 @Override 4482 protected boolean dispatchConsistencyCheck(int consistency) { 4483 boolean result = super.dispatchConsistencyCheck(consistency); 4484 4485 final int count = mChildrenCount; 4486 final View[] children = mChildren; 4487 for (int i = 0; i < count; i++) { 4488 if (!children[i].dispatchConsistencyCheck(consistency)) result = false; 4489 } 4490 4491 return result; 4492 } 4493 4494 /** 4495 * @hide 4496 */ 4497 @Override 4498 protected boolean onConsistencyCheck(int consistency) { 4499 boolean result = super.onConsistencyCheck(consistency); 4500 4501 final boolean checkLayout = (consistency & ViewDebug.CONSISTENCY_LAYOUT) != 0; 4502 final boolean checkDrawing = (consistency & ViewDebug.CONSISTENCY_DRAWING) != 0; 4503 4504 if (checkLayout) { 4505 final int count = mChildrenCount; 4506 final View[] children = mChildren; 4507 for (int i = 0; i < count; i++) { 4508 if (children[i].getParent() != this) { 4509 result = false; 4510 android.util.Log.d(ViewDebug.CONSISTENCY_LOG_TAG, 4511 "View " + children[i] + " has no parent/a parent that is not " + this); 4512 } 4513 } 4514 } 4515 4516 if (checkDrawing) { 4517 // If this group is dirty, check that the parent is dirty as well 4518 if ((mPrivateFlags & DIRTY_MASK) != 0) { 4519 final ViewParent parent = getParent(); 4520 if (parent != null && !(parent instanceof ViewRootImpl)) { 4521 if ((((View) parent).mPrivateFlags & DIRTY_MASK) == 0) { 4522 result = false; 4523 android.util.Log.d(ViewDebug.CONSISTENCY_LOG_TAG, 4524 "ViewGroup " + this + " is dirty but its parent is not: " + this); 4525 } 4526 } 4527 } 4528 } 4529 4530 return result; 4531 } 4532 4533 /** 4534 * {@inheritDoc} 4535 */ 4536 @Override 4537 protected void debug(int depth) { 4538 super.debug(depth); 4539 String output; 4540 4541 if (mFocused != null) { 4542 output = debugIndent(depth); 4543 output += "mFocused"; 4544 Log.d(VIEW_LOG_TAG, output); 4545 } 4546 if (mChildrenCount != 0) { 4547 output = debugIndent(depth); 4548 output += "{"; 4549 Log.d(VIEW_LOG_TAG, output); 4550 } 4551 int count = mChildrenCount; 4552 for (int i = 0; i < count; i++) { 4553 View child = mChildren[i]; 4554 child.debug(depth + 1); 4555 } 4556 4557 if (mChildrenCount != 0) { 4558 output = debugIndent(depth); 4559 output += "}"; 4560 Log.d(VIEW_LOG_TAG, output); 4561 } 4562 } 4563 4564 /** 4565 * Returns the position in the group of the specified child view. 4566 * 4567 * @param child the view for which to get the position 4568 * @return a positive integer representing the position of the view in the 4569 * group, or -1 if the view does not exist in the group 4570 */ 4571 public int indexOfChild(View child) { 4572 final int count = mChildrenCount; 4573 final View[] children = mChildren; 4574 for (int i = 0; i < count; i++) { 4575 if (children[i] == child) { 4576 return i; 4577 } 4578 } 4579 return -1; 4580 } 4581 4582 /** 4583 * Returns the number of children in the group. 4584 * 4585 * @return a positive integer representing the number of children in 4586 * the group 4587 */ 4588 public int getChildCount() { 4589 return mChildrenCount; 4590 } 4591 4592 /** 4593 * Returns the view at the specified position in the group. 4594 * 4595 * @param index the position at which to get the view from 4596 * @return the view at the specified position or null if the position 4597 * does not exist within the group 4598 */ 4599 public View getChildAt(int index) { 4600 if (index < 0 || index >= mChildrenCount) { 4601 return null; 4602 } 4603 return mChildren[index]; 4604 } 4605 4606 /** 4607 * Ask all of the children of this view to measure themselves, taking into 4608 * account both the MeasureSpec requirements for this view and its padding. 4609 * We skip children that are in the GONE state The heavy lifting is done in 4610 * getChildMeasureSpec. 4611 * 4612 * @param widthMeasureSpec The width requirements for this view 4613 * @param heightMeasureSpec The height requirements for this view 4614 */ 4615 protected void measureChildren(int widthMeasureSpec, int heightMeasureSpec) { 4616 final int size = mChildrenCount; 4617 final View[] children = mChildren; 4618 for (int i = 0; i < size; ++i) { 4619 final View child = children[i]; 4620 if ((child.mViewFlags & VISIBILITY_MASK) != GONE) { 4621 measureChild(child, widthMeasureSpec, heightMeasureSpec); 4622 } 4623 } 4624 } 4625 4626 /** 4627 * Ask one of the children of this view to measure itself, taking into 4628 * account both the MeasureSpec requirements for this view and its padding. 4629 * The heavy lifting is done in getChildMeasureSpec. 4630 * 4631 * @param child The child to measure 4632 * @param parentWidthMeasureSpec The width requirements for this view 4633 * @param parentHeightMeasureSpec The height requirements for this view 4634 */ 4635 protected void measureChild(View child, int parentWidthMeasureSpec, 4636 int parentHeightMeasureSpec) { 4637 final LayoutParams lp = child.getLayoutParams(); 4638 4639 final int childWidthMeasureSpec = getChildMeasureSpec(parentWidthMeasureSpec, 4640 mPaddingLeft + mPaddingRight, lp.width); 4641 final int childHeightMeasureSpec = getChildMeasureSpec(parentHeightMeasureSpec, 4642 mPaddingTop + mPaddingBottom, lp.height); 4643 4644 child.measure(childWidthMeasureSpec, childHeightMeasureSpec); 4645 } 4646 4647 /** 4648 * Ask one of the children of this view to measure itself, taking into 4649 * account both the MeasureSpec requirements for this view and its padding 4650 * and margins. The child must have MarginLayoutParams The heavy lifting is 4651 * done in getChildMeasureSpec. 4652 * 4653 * @param child The child to measure 4654 * @param parentWidthMeasureSpec The width requirements for this view 4655 * @param widthUsed Extra space that has been used up by the parent 4656 * horizontally (possibly by other children of the parent) 4657 * @param parentHeightMeasureSpec The height requirements for this view 4658 * @param heightUsed Extra space that has been used up by the parent 4659 * vertically (possibly by other children of the parent) 4660 */ 4661 protected void measureChildWithMargins(View child, 4662 int parentWidthMeasureSpec, int widthUsed, 4663 int parentHeightMeasureSpec, int heightUsed) { 4664 final MarginLayoutParams lp = (MarginLayoutParams) child.getLayoutParams(); 4665 4666 final int childWidthMeasureSpec = getChildMeasureSpec(parentWidthMeasureSpec, 4667 mPaddingLeft + mPaddingRight + lp.leftMargin + lp.rightMargin 4668 + widthUsed, lp.width); 4669 final int childHeightMeasureSpec = getChildMeasureSpec(parentHeightMeasureSpec, 4670 mPaddingTop + mPaddingBottom + lp.topMargin + lp.bottomMargin 4671 + heightUsed, lp.height); 4672 4673 child.measure(childWidthMeasureSpec, childHeightMeasureSpec); 4674 } 4675 4676 /** 4677 * Does the hard part of measureChildren: figuring out the MeasureSpec to 4678 * pass to a particular child. This method figures out the right MeasureSpec 4679 * for one dimension (height or width) of one child view. 4680 * 4681 * The goal is to combine information from our MeasureSpec with the 4682 * LayoutParams of the child to get the best possible results. For example, 4683 * if the this view knows its size (because its MeasureSpec has a mode of 4684 * EXACTLY), and the child has indicated in its LayoutParams that it wants 4685 * to be the same size as the parent, the parent should ask the child to 4686 * layout given an exact size. 4687 * 4688 * @param spec The requirements for this view 4689 * @param padding The padding of this view for the current dimension and 4690 * margins, if applicable 4691 * @param childDimension How big the child wants to be in the current 4692 * dimension 4693 * @return a MeasureSpec integer for the child 4694 */ 4695 public static int getChildMeasureSpec(int spec, int padding, int childDimension) { 4696 int specMode = MeasureSpec.getMode(spec); 4697 int specSize = MeasureSpec.getSize(spec); 4698 4699 int size = Math.max(0, specSize - padding); 4700 4701 int resultSize = 0; 4702 int resultMode = 0; 4703 4704 switch (specMode) { 4705 // Parent has imposed an exact size on us 4706 case MeasureSpec.EXACTLY: 4707 if (childDimension >= 0) { 4708 resultSize = childDimension; 4709 resultMode = MeasureSpec.EXACTLY; 4710 } else if (childDimension == LayoutParams.MATCH_PARENT) { 4711 // Child wants to be our size. So be it. 4712 resultSize = size; 4713 resultMode = MeasureSpec.EXACTLY; 4714 } else if (childDimension == LayoutParams.WRAP_CONTENT) { 4715 // Child wants to determine its own size. It can't be 4716 // bigger than us. 4717 resultSize = size; 4718 resultMode = MeasureSpec.AT_MOST; 4719 } 4720 break; 4721 4722 // Parent has imposed a maximum size on us 4723 case MeasureSpec.AT_MOST: 4724 if (childDimension >= 0) { 4725 // Child wants a specific size... so be it 4726 resultSize = childDimension; 4727 resultMode = MeasureSpec.EXACTLY; 4728 } else if (childDimension == LayoutParams.MATCH_PARENT) { 4729 // Child wants to be our size, but our size is not fixed. 4730 // Constrain child to not be bigger than us. 4731 resultSize = size; 4732 resultMode = MeasureSpec.AT_MOST; 4733 } else if (childDimension == LayoutParams.WRAP_CONTENT) { 4734 // Child wants to determine its own size. It can't be 4735 // bigger than us. 4736 resultSize = size; 4737 resultMode = MeasureSpec.AT_MOST; 4738 } 4739 break; 4740 4741 // Parent asked to see how big we want to be 4742 case MeasureSpec.UNSPECIFIED: 4743 if (childDimension >= 0) { 4744 // Child wants a specific size... let him have it 4745 resultSize = childDimension; 4746 resultMode = MeasureSpec.EXACTLY; 4747 } else if (childDimension == LayoutParams.MATCH_PARENT) { 4748 // Child wants to be our size... find out how big it should 4749 // be 4750 resultSize = 0; 4751 resultMode = MeasureSpec.UNSPECIFIED; 4752 } else if (childDimension == LayoutParams.WRAP_CONTENT) { 4753 // Child wants to determine its own size.... find out how 4754 // big it should be 4755 resultSize = 0; 4756 resultMode = MeasureSpec.UNSPECIFIED; 4757 } 4758 break; 4759 } 4760 return MeasureSpec.makeMeasureSpec(resultSize, resultMode); 4761 } 4762 4763 4764 /** 4765 * Removes any pending animations for views that have been removed. Call 4766 * this if you don't want animations for exiting views to stack up. 4767 */ 4768 public void clearDisappearingChildren() { 4769 if (mDisappearingChildren != null) { 4770 mDisappearingChildren.clear(); 4771 } 4772 } 4773 4774 /** 4775 * Add a view which is removed from mChildren but still needs animation 4776 * 4777 * @param v View to add 4778 */ 4779 private void addDisappearingView(View v) { 4780 ArrayList<View> disappearingChildren = mDisappearingChildren; 4781 4782 if (disappearingChildren == null) { 4783 disappearingChildren = mDisappearingChildren = new ArrayList<View>(); 4784 } 4785 4786 disappearingChildren.add(v); 4787 } 4788 4789 /** 4790 * Cleanup a view when its animation is done. This may mean removing it from 4791 * the list of disappearing views. 4792 * 4793 * @param view The view whose animation has finished 4794 * @param animation The animation, cannot be null 4795 */ 4796 private void finishAnimatingView(final View view, Animation animation) { 4797 final ArrayList<View> disappearingChildren = mDisappearingChildren; 4798 if (disappearingChildren != null) { 4799 if (disappearingChildren.contains(view)) { 4800 disappearingChildren.remove(view); 4801 4802 if (view.mAttachInfo != null) { 4803 view.dispatchDetachedFromWindow(); 4804 } 4805 4806 view.clearAnimation(); 4807 mGroupFlags |= FLAG_INVALIDATE_REQUIRED; 4808 } 4809 } 4810 4811 if (animation != null && !animation.getFillAfter()) { 4812 view.clearAnimation(); 4813 } 4814 4815 if ((view.mPrivateFlags & ANIMATION_STARTED) == ANIMATION_STARTED) { 4816 view.onAnimationEnd(); 4817 // Should be performed by onAnimationEnd() but this avoid an infinite loop, 4818 // so we'd rather be safe than sorry 4819 view.mPrivateFlags &= ~ANIMATION_STARTED; 4820 // Draw one more frame after the animation is done 4821 mGroupFlags |= FLAG_INVALIDATE_REQUIRED; 4822 } 4823 } 4824 4825 /** 4826 * Utility function called by View during invalidation to determine whether a view that 4827 * is invisible or gone should still be invalidated because it is being transitioned (and 4828 * therefore still needs to be drawn). 4829 */ 4830 boolean isViewTransitioning(View view) { 4831 return (mTransitioningViews != null && mTransitioningViews.contains(view)); 4832 } 4833 4834 /** 4835 * This method tells the ViewGroup that the given View object, which should have this 4836 * ViewGroup as its parent, 4837 * should be kept around (re-displayed when the ViewGroup draws its children) even if it 4838 * is removed from its parent. This allows animations, such as those used by 4839 * {@link android.app.Fragment} and {@link android.animation.LayoutTransition} to animate 4840 * the removal of views. A call to this method should always be accompanied by a later call 4841 * to {@link #endViewTransition(View)}, such as after an animation on the View has finished, 4842 * so that the View finally gets removed. 4843 * 4844 * @param view The View object to be kept visible even if it gets removed from its parent. 4845 */ 4846 public void startViewTransition(View view) { 4847 if (view.mParent == this) { 4848 if (mTransitioningViews == null) { 4849 mTransitioningViews = new ArrayList<View>(); 4850 } 4851 mTransitioningViews.add(view); 4852 } 4853 } 4854 4855 /** 4856 * This method should always be called following an earlier call to 4857 * {@link #startViewTransition(View)}. The given View is finally removed from its parent 4858 * and will no longer be displayed. Note that this method does not perform the functionality 4859 * of removing a view from its parent; it just discontinues the display of a View that 4860 * has previously been removed. 4861 * 4862 * @return view The View object that has been removed but is being kept around in the visible 4863 * hierarchy by an earlier call to {@link #startViewTransition(View)}. 4864 */ 4865 public void endViewTransition(View view) { 4866 if (mTransitioningViews != null) { 4867 mTransitioningViews.remove(view); 4868 final ArrayList<View> disappearingChildren = mDisappearingChildren; 4869 if (disappearingChildren != null && disappearingChildren.contains(view)) { 4870 disappearingChildren.remove(view); 4871 if (mVisibilityChangingChildren != null && 4872 mVisibilityChangingChildren.contains(view)) { 4873 mVisibilityChangingChildren.remove(view); 4874 } else { 4875 if (view.mAttachInfo != null) { 4876 view.dispatchDetachedFromWindow(); 4877 } 4878 if (view.mParent != null) { 4879 view.mParent = null; 4880 } 4881 } 4882 mGroupFlags |= FLAG_INVALIDATE_REQUIRED; 4883 } 4884 } 4885 } 4886 4887 private LayoutTransition.TransitionListener mLayoutTransitionListener = 4888 new LayoutTransition.TransitionListener() { 4889 @Override 4890 public void startTransition(LayoutTransition transition, ViewGroup container, 4891 View view, int transitionType) { 4892 // We only care about disappearing items, since we need special logic to keep 4893 // those items visible after they've been 'removed' 4894 if (transitionType == LayoutTransition.DISAPPEARING) { 4895 startViewTransition(view); 4896 } 4897 } 4898 4899 @Override 4900 public void endTransition(LayoutTransition transition, ViewGroup container, 4901 View view, int transitionType) { 4902 if (mLayoutSuppressed && !transition.isChangingLayout()) { 4903 requestLayout(); 4904 mLayoutSuppressed = false; 4905 } 4906 if (transitionType == LayoutTransition.DISAPPEARING && mTransitioningViews != null) { 4907 endViewTransition(view); 4908 } 4909 } 4910 }; 4911 4912 /** 4913 * {@inheritDoc} 4914 */ 4915 @Override 4916 public boolean gatherTransparentRegion(Region region) { 4917 // If no transparent regions requested, we are always opaque. 4918 final boolean meOpaque = (mPrivateFlags & View.REQUEST_TRANSPARENT_REGIONS) == 0; 4919 if (meOpaque && region == null) { 4920 // The caller doesn't care about the region, so stop now. 4921 return true; 4922 } 4923 super.gatherTransparentRegion(region); 4924 final View[] children = mChildren; 4925 final int count = mChildrenCount; 4926 boolean noneOfTheChildrenAreTransparent = true; 4927 for (int i = 0; i < count; i++) { 4928 final View child = children[i]; 4929 if ((child.mViewFlags & VISIBILITY_MASK) == VISIBLE || child.getAnimation() != null) { 4930 if (!child.gatherTransparentRegion(region)) { 4931 noneOfTheChildrenAreTransparent = false; 4932 } 4933 } 4934 } 4935 return meOpaque || noneOfTheChildrenAreTransparent; 4936 } 4937 4938 /** 4939 * {@inheritDoc} 4940 */ 4941 public void requestTransparentRegion(View child) { 4942 if (child != null) { 4943 child.mPrivateFlags |= View.REQUEST_TRANSPARENT_REGIONS; 4944 if (mParent != null) { 4945 mParent.requestTransparentRegion(this); 4946 } 4947 } 4948 } 4949 4950 4951 @Override 4952 protected boolean fitSystemWindows(Rect insets) { 4953 boolean done = super.fitSystemWindows(insets); 4954 if (!done) { 4955 final int count = mChildrenCount; 4956 final View[] children = mChildren; 4957 for (int i = 0; i < count; i++) { 4958 done = children[i].fitSystemWindows(insets); 4959 if (done) { 4960 break; 4961 } 4962 } 4963 } 4964 return done; 4965 } 4966 4967 /** 4968 * Returns the animation listener to which layout animation events are 4969 * sent. 4970 * 4971 * @return an {@link android.view.animation.Animation.AnimationListener} 4972 */ 4973 public Animation.AnimationListener getLayoutAnimationListener() { 4974 return mAnimationListener; 4975 } 4976 4977 @Override 4978 protected void drawableStateChanged() { 4979 super.drawableStateChanged(); 4980 4981 if ((mGroupFlags & FLAG_NOTIFY_CHILDREN_ON_DRAWABLE_STATE_CHANGE) != 0) { 4982 if ((mGroupFlags & FLAG_ADD_STATES_FROM_CHILDREN) != 0) { 4983 throw new IllegalStateException("addStateFromChildren cannot be enabled if a" 4984 + " child has duplicateParentState set to true"); 4985 } 4986 4987 final View[] children = mChildren; 4988 final int count = mChildrenCount; 4989 4990 for (int i = 0; i < count; i++) { 4991 final View child = children[i]; 4992 if ((child.mViewFlags & DUPLICATE_PARENT_STATE) != 0) { 4993 child.refreshDrawableState(); 4994 } 4995 } 4996 } 4997 } 4998 4999 @Override 5000 public void jumpDrawablesToCurrentState() { 5001 super.jumpDrawablesToCurrentState(); 5002 final View[] children = mChildren; 5003 final int count = mChildrenCount; 5004 for (int i = 0; i < count; i++) { 5005 children[i].jumpDrawablesToCurrentState(); 5006 } 5007 } 5008 5009 @Override 5010 protected int[] onCreateDrawableState(int extraSpace) { 5011 if ((mGroupFlags & FLAG_ADD_STATES_FROM_CHILDREN) == 0) { 5012 return super.onCreateDrawableState(extraSpace); 5013 } 5014 5015 int need = 0; 5016 int n = getChildCount(); 5017 for (int i = 0; i < n; i++) { 5018 int[] childState = getChildAt(i).getDrawableState(); 5019 5020 if (childState != null) { 5021 need += childState.length; 5022 } 5023 } 5024 5025 int[] state = super.onCreateDrawableState(extraSpace + need); 5026 5027 for (int i = 0; i < n; i++) { 5028 int[] childState = getChildAt(i).getDrawableState(); 5029 5030 if (childState != null) { 5031 state = mergeDrawableStates(state, childState); 5032 } 5033 } 5034 5035 return state; 5036 } 5037 5038 /** 5039 * Sets whether this ViewGroup's drawable states also include 5040 * its children's drawable states. This is used, for example, to 5041 * make a group appear to be focused when its child EditText or button 5042 * is focused. 5043 */ 5044 public void setAddStatesFromChildren(boolean addsStates) { 5045 if (addsStates) { 5046 mGroupFlags |= FLAG_ADD_STATES_FROM_CHILDREN; 5047 } else { 5048 mGroupFlags &= ~FLAG_ADD_STATES_FROM_CHILDREN; 5049 } 5050 5051 refreshDrawableState(); 5052 } 5053 5054 /** 5055 * Returns whether this ViewGroup's drawable states also include 5056 * its children's drawable states. This is used, for example, to 5057 * make a group appear to be focused when its child EditText or button 5058 * is focused. 5059 */ 5060 public boolean addStatesFromChildren() { 5061 return (mGroupFlags & FLAG_ADD_STATES_FROM_CHILDREN) != 0; 5062 } 5063 5064 /** 5065 * If {link #addStatesFromChildren} is true, refreshes this group's 5066 * drawable state (to include the states from its children). 5067 */ 5068 public void childDrawableStateChanged(View child) { 5069 if ((mGroupFlags & FLAG_ADD_STATES_FROM_CHILDREN) != 0) { 5070 refreshDrawableState(); 5071 } 5072 } 5073 5074 /** 5075 * Specifies the animation listener to which layout animation events must 5076 * be sent. Only 5077 * {@link android.view.animation.Animation.AnimationListener#onAnimationStart(Animation)} 5078 * and 5079 * {@link android.view.animation.Animation.AnimationListener#onAnimationEnd(Animation)} 5080 * are invoked. 5081 * 5082 * @param animationListener the layout animation listener 5083 */ 5084 public void setLayoutAnimationListener(Animation.AnimationListener animationListener) { 5085 mAnimationListener = animationListener; 5086 } 5087 5088 /** 5089 * This method is called by LayoutTransition when there are 'changing' animations that need 5090 * to start after the layout/setup phase. The request is forwarded to the ViewAncestor, who 5091 * starts all pending transitions prior to the drawing phase in the current traversal. 5092 * 5093 * @param transition The LayoutTransition to be started on the next traversal. 5094 * 5095 * @hide 5096 */ 5097 public void requestTransitionStart(LayoutTransition transition) { 5098 ViewRootImpl viewAncestor = getViewRootImpl(); 5099 if (viewAncestor != null) { 5100 viewAncestor.requestTransitionStart(transition); 5101 } 5102 } 5103 5104 @Override 5105 protected void resetResolvedLayoutDirection() { 5106 super.resetResolvedLayoutDirection(); 5107 5108 // Take care of resetting the children resolution too 5109 final int count = getChildCount(); 5110 for (int i = 0; i < count; i++) { 5111 final View child = getChildAt(i); 5112 if (child.getLayoutDirection() == LAYOUT_DIRECTION_INHERIT) { 5113 child.resetResolvedLayoutDirection(); 5114 } 5115 } 5116 } 5117 5118 @Override 5119 protected void resetResolvedTextDirection() { 5120 super.resetResolvedTextDirection(); 5121 5122 // Take care of resetting the children resolution too 5123 final int count = getChildCount(); 5124 for (int i = 0; i < count; i++) { 5125 final View child = getChildAt(i); 5126 if (child.getTextDirection() == TEXT_DIRECTION_INHERIT) { 5127 child.resetResolvedTextDirection(); 5128 } 5129 } 5130 } 5131 5132 /** 5133 * Return true if the pressed state should be delayed for children or descendants of this 5134 * ViewGroup. Generally, this should be done for containers that can scroll, such as a List. 5135 * This prevents the pressed state from appearing when the user is actually trying to scroll 5136 * the content. 5137 * 5138 * The default implementation returns true for compatibility reasons. Subclasses that do 5139 * not scroll should generally override this method and return false. 5140 */ 5141 public boolean shouldDelayChildPressedState() { 5142 return true; 5143 } 5144 5145 /** 5146 * LayoutParams are used by views to tell their parents how they want to be 5147 * laid out. See 5148 * {@link android.R.styleable#ViewGroup_Layout ViewGroup Layout Attributes} 5149 * for a list of all child view attributes that this class supports. 5150 * 5151 * <p> 5152 * The base LayoutParams class just describes how big the view wants to be 5153 * for both width and height. For each dimension, it can specify one of: 5154 * <ul> 5155 * <li>FILL_PARENT (renamed MATCH_PARENT in API Level 8 and higher), which 5156 * means that the view wants to be as big as its parent (minus padding) 5157 * <li> WRAP_CONTENT, which means that the view wants to be just big enough 5158 * to enclose its content (plus padding) 5159 * <li> an exact number 5160 * </ul> 5161 * There are subclasses of LayoutParams for different subclasses of 5162 * ViewGroup. For example, AbsoluteLayout has its own subclass of 5163 * LayoutParams which adds an X and Y value.</p> 5164 * 5165 * <div class="special reference"> 5166 * <h3>Developer Guides</h3> 5167 * <p>For more information about creating user interface layouts, read the 5168 * <a href="{@docRoot}guide/topics/ui/declaring-layout.html">XML Layouts</a> developer 5169 * guide.</p></div> 5170 * 5171 * @attr ref android.R.styleable#ViewGroup_Layout_layout_height 5172 * @attr ref android.R.styleable#ViewGroup_Layout_layout_width 5173 */ 5174 public static class LayoutParams { 5175 /** 5176 * Special value for the height or width requested by a View. 5177 * FILL_PARENT means that the view wants to be as big as its parent, 5178 * minus the parent's padding, if any. This value is deprecated 5179 * starting in API Level 8 and replaced by {@link #MATCH_PARENT}. 5180 */ 5181 @SuppressWarnings({"UnusedDeclaration"}) 5182 @Deprecated 5183 public static final int FILL_PARENT = -1; 5184 5185 /** 5186 * Special value for the height or width requested by a View. 5187 * MATCH_PARENT means that the view wants to be as big as its parent, 5188 * minus the parent's padding, if any. Introduced in API Level 8. 5189 */ 5190 public static final int MATCH_PARENT = -1; 5191 5192 /** 5193 * Special value for the height or width requested by a View. 5194 * WRAP_CONTENT means that the view wants to be just large enough to fit 5195 * its own internal content, taking its own padding into account. 5196 */ 5197 public static final int WRAP_CONTENT = -2; 5198 5199 /** 5200 * Information about how wide the view wants to be. Can be one of the 5201 * constants FILL_PARENT (replaced by MATCH_PARENT , 5202 * in API Level 8) or WRAP_CONTENT. or an exact size. 5203 */ 5204 @ViewDebug.ExportedProperty(category = "layout", mapping = { 5205 @ViewDebug.IntToString(from = MATCH_PARENT, to = "MATCH_PARENT"), 5206 @ViewDebug.IntToString(from = WRAP_CONTENT, to = "WRAP_CONTENT") 5207 }) 5208 public int width; 5209 5210 /** 5211 * Information about how tall the view wants to be. Can be one of the 5212 * constants FILL_PARENT (replaced by MATCH_PARENT , 5213 * in API Level 8) or WRAP_CONTENT. or an exact size. 5214 */ 5215 @ViewDebug.ExportedProperty(category = "layout", mapping = { 5216 @ViewDebug.IntToString(from = MATCH_PARENT, to = "MATCH_PARENT"), 5217 @ViewDebug.IntToString(from = WRAP_CONTENT, to = "WRAP_CONTENT") 5218 }) 5219 public int height; 5220 5221 /** 5222 * Used to animate layouts. 5223 */ 5224 public LayoutAnimationController.AnimationParameters layoutAnimationParameters; 5225 5226 /** 5227 * Creates a new set of layout parameters. The values are extracted from 5228 * the supplied attributes set and context. The XML attributes mapped 5229 * to this set of layout parameters are: 5230 * 5231 * <ul> 5232 * <li><code>layout_width</code>: the width, either an exact value, 5233 * {@link #WRAP_CONTENT}, or {@link #FILL_PARENT} (replaced by 5234 * {@link #MATCH_PARENT} in API Level 8)</li> 5235 * <li><code>layout_height</code>: the height, either an exact value, 5236 * {@link #WRAP_CONTENT}, or {@link #FILL_PARENT} (replaced by 5237 * {@link #MATCH_PARENT} in API Level 8)</li> 5238 * </ul> 5239 * 5240 * @param c the application environment 5241 * @param attrs the set of attributes from which to extract the layout 5242 * parameters' values 5243 */ 5244 public LayoutParams(Context c, AttributeSet attrs) { 5245 TypedArray a = c.obtainStyledAttributes(attrs, R.styleable.ViewGroup_Layout); 5246 setBaseAttributes(a, 5247 R.styleable.ViewGroup_Layout_layout_width, 5248 R.styleable.ViewGroup_Layout_layout_height); 5249 a.recycle(); 5250 } 5251 5252 /** 5253 * Creates a new set of layout parameters with the specified width 5254 * and height. 5255 * 5256 * @param width the width, either {@link #WRAP_CONTENT}, 5257 * {@link #FILL_PARENT} (replaced by {@link #MATCH_PARENT} in 5258 * API Level 8), or a fixed size in pixels 5259 * @param height the height, either {@link #WRAP_CONTENT}, 5260 * {@link #FILL_PARENT} (replaced by {@link #MATCH_PARENT} in 5261 * API Level 8), or a fixed size in pixels 5262 */ 5263 public LayoutParams(int width, int height) { 5264 this.width = width; 5265 this.height = height; 5266 } 5267 5268 /** 5269 * Copy constructor. Clones the width and height values of the source. 5270 * 5271 * @param source The layout params to copy from. 5272 */ 5273 public LayoutParams(LayoutParams source) { 5274 this.width = source.width; 5275 this.height = source.height; 5276 } 5277 5278 /** 5279 * Used internally by MarginLayoutParams. 5280 * @hide 5281 */ 5282 LayoutParams() { 5283 } 5284 5285 /** 5286 * Extracts the layout parameters from the supplied attributes. 5287 * 5288 * @param a the style attributes to extract the parameters from 5289 * @param widthAttr the identifier of the width attribute 5290 * @param heightAttr the identifier of the height attribute 5291 */ 5292 protected void setBaseAttributes(TypedArray a, int widthAttr, int heightAttr) { 5293 width = a.getLayoutDimension(widthAttr, "layout_width"); 5294 height = a.getLayoutDimension(heightAttr, "layout_height"); 5295 } 5296 5297 /** 5298 * Resolve layout parameters depending on the layout direction. Subclasses that care about 5299 * layoutDirection changes should override this method. The default implementation does 5300 * nothing. 5301 * 5302 * @param layoutDirection the direction of the layout 5303 * 5304 * {@link View#LAYOUT_DIRECTION_LTR} 5305 * {@link View#LAYOUT_DIRECTION_RTL} 5306 * 5307 * @hide 5308 */ 5309 protected void resolveWithDirection(int layoutDirection) { 5310 } 5311 5312 /** 5313 * Returns a String representation of this set of layout parameters. 5314 * 5315 * @param output the String to prepend to the internal representation 5316 * @return a String with the following format: output + 5317 * "ViewGroup.LayoutParams={ width=WIDTH, height=HEIGHT }" 5318 * 5319 * @hide 5320 */ 5321 public String debug(String output) { 5322 return output + "ViewGroup.LayoutParams={ width=" 5323 + sizeToString(width) + ", height=" + sizeToString(height) + " }"; 5324 } 5325 5326 /** 5327 * Converts the specified size to a readable String. 5328 * 5329 * @param size the size to convert 5330 * @return a String instance representing the supplied size 5331 * 5332 * @hide 5333 */ 5334 protected static String sizeToString(int size) { 5335 if (size == WRAP_CONTENT) { 5336 return "wrap-content"; 5337 } 5338 if (size == MATCH_PARENT) { 5339 return "match-parent"; 5340 } 5341 return String.valueOf(size); 5342 } 5343 } 5344 5345 /** 5346 * Per-child layout information for layouts that support margins. 5347 * See 5348 * {@link android.R.styleable#ViewGroup_MarginLayout ViewGroup Margin Layout Attributes} 5349 * for a list of all child view attributes that this class supports. 5350 */ 5351 public static class MarginLayoutParams extends ViewGroup.LayoutParams { 5352 /** 5353 * The left margin in pixels of the child. Whenever this value is changed, a call to 5354 * {@link android.view.View#requestLayout()} needs to be done. 5355 */ 5356 @ViewDebug.ExportedProperty(category = "layout") 5357 public int leftMargin; 5358 5359 /** 5360 * The top margin in pixels of the child. Whenever this value is changed, a call to 5361 * {@link android.view.View#requestLayout()} needs to be done. 5362 */ 5363 @ViewDebug.ExportedProperty(category = "layout") 5364 public int topMargin; 5365 5366 /** 5367 * The right margin in pixels of the child. Whenever this value is changed, a call to 5368 * {@link android.view.View#requestLayout()} needs to be done. 5369 */ 5370 @ViewDebug.ExportedProperty(category = "layout") 5371 public int rightMargin; 5372 5373 /** 5374 * The bottom margin in pixels of the child. Whenever this value is changed, a call to 5375 * {@link android.view.View#requestLayout()} needs to be done. 5376 */ 5377 @ViewDebug.ExportedProperty(category = "layout") 5378 public int bottomMargin; 5379 5380 /** 5381 * The start margin in pixels of the child. 5382 * 5383 * @hide 5384 * 5385 */ 5386 @ViewDebug.ExportedProperty(category = "layout") 5387 protected int startMargin = DEFAULT_RELATIVE; 5388 5389 /** 5390 * The end margin in pixels of the child. 5391 * 5392 * @hide 5393 */ 5394 @ViewDebug.ExportedProperty(category = "layout") 5395 protected int endMargin = DEFAULT_RELATIVE; 5396 5397 /** 5398 * The default start and end margin. 5399 */ 5400 static private final int DEFAULT_RELATIVE = Integer.MIN_VALUE; 5401 5402 /** 5403 * Creates a new set of layout parameters. The values are extracted from 5404 * the supplied attributes set and context. 5405 * 5406 * @param c the application environment 5407 * @param attrs the set of attributes from which to extract the layout 5408 * parameters' values 5409 */ 5410 public MarginLayoutParams(Context c, AttributeSet attrs) { 5411 super(); 5412 5413 TypedArray a = c.obtainStyledAttributes(attrs, R.styleable.ViewGroup_MarginLayout); 5414 setBaseAttributes(a, 5415 R.styleable.ViewGroup_MarginLayout_layout_width, 5416 R.styleable.ViewGroup_MarginLayout_layout_height); 5417 5418 int margin = a.getDimensionPixelSize( 5419 com.android.internal.R.styleable.ViewGroup_MarginLayout_layout_margin, -1); 5420 if (margin >= 0) { 5421 leftMargin = margin; 5422 topMargin = margin; 5423 rightMargin= margin; 5424 bottomMargin = margin; 5425 } else { 5426 leftMargin = a.getDimensionPixelSize( 5427 R.styleable.ViewGroup_MarginLayout_layout_marginLeft, 0); 5428 topMargin = a.getDimensionPixelSize( 5429 R.styleable.ViewGroup_MarginLayout_layout_marginTop, 0); 5430 rightMargin = a.getDimensionPixelSize( 5431 R.styleable.ViewGroup_MarginLayout_layout_marginRight, 0); 5432 bottomMargin = a.getDimensionPixelSize( 5433 R.styleable.ViewGroup_MarginLayout_layout_marginBottom, 0); 5434 startMargin = a.getDimensionPixelSize( 5435 R.styleable.ViewGroup_MarginLayout_layout_marginStart, DEFAULT_RELATIVE); 5436 endMargin = a.getDimensionPixelSize( 5437 R.styleable.ViewGroup_MarginLayout_layout_marginEnd, DEFAULT_RELATIVE); 5438 } 5439 5440 a.recycle(); 5441 } 5442 5443 /** 5444 * {@inheritDoc} 5445 */ 5446 public MarginLayoutParams(int width, int height) { 5447 super(width, height); 5448 } 5449 5450 /** 5451 * Copy constructor. Clones the width, height and margin values of the source. 5452 * 5453 * @param source The layout params to copy from. 5454 */ 5455 public MarginLayoutParams(MarginLayoutParams source) { 5456 this.width = source.width; 5457 this.height = source.height; 5458 5459 this.leftMargin = source.leftMargin; 5460 this.topMargin = source.topMargin; 5461 this.rightMargin = source.rightMargin; 5462 this.bottomMargin = source.bottomMargin; 5463 this.startMargin = source.startMargin; 5464 this.endMargin = source.endMargin; 5465 } 5466 5467 /** 5468 * {@inheritDoc} 5469 */ 5470 public MarginLayoutParams(LayoutParams source) { 5471 super(source); 5472 } 5473 5474 /** 5475 * Sets the margins, in pixels. A call to {@link android.view.View#requestLayout()} needs 5476 * to be done so that the new margins are taken into account. Left and right margins may be 5477 * overriden by {@link android.view.View#requestLayout()} depending on layout direction. 5478 * 5479 * @param left the left margin size 5480 * @param top the top margin size 5481 * @param right the right margin size 5482 * @param bottom the bottom margin size 5483 * 5484 * @attr ref android.R.styleable#ViewGroup_MarginLayout_layout_marginLeft 5485 * @attr ref android.R.styleable#ViewGroup_MarginLayout_layout_marginTop 5486 * @attr ref android.R.styleable#ViewGroup_MarginLayout_layout_marginRight 5487 * @attr ref android.R.styleable#ViewGroup_MarginLayout_layout_marginBottom 5488 */ 5489 public void setMargins(int left, int top, int right, int bottom) { 5490 leftMargin = left; 5491 topMargin = top; 5492 rightMargin = right; 5493 bottomMargin = bottom; 5494 } 5495 5496 /** 5497 * Sets the relative margins, in pixels. A call to {@link android.view.View#requestLayout()} 5498 * needs to be done so that the new relative margins are taken into account. Left and right 5499 * margins may be overriden by {@link android.view.View#requestLayout()} depending on layout 5500 * direction. 5501 * 5502 * @param start the start margin size 5503 * @param top the top margin size 5504 * @param end the right margin size 5505 * @param bottom the bottom margin size 5506 * 5507 * @attr ref android.R.styleable#ViewGroup_MarginLayout_layout_marginStart 5508 * @attr ref android.R.styleable#ViewGroup_MarginLayout_layout_marginTop 5509 * @attr ref android.R.styleable#ViewGroup_MarginLayout_layout_marginEnd 5510 * @attr ref android.R.styleable#ViewGroup_MarginLayout_layout_marginBottom 5511 * 5512 * @hide 5513 */ 5514 public void setMarginsRelative(int start, int top, int end, int bottom) { 5515 startMargin = start; 5516 topMargin = top; 5517 endMargin = end; 5518 bottomMargin = bottom; 5519 } 5520 5521 /** 5522 * Returns the start margin in pixels. 5523 * 5524 * @attr ref android.R.styleable#ViewGroup_MarginLayout_layout_marginStart 5525 * 5526 * @return the start margin in pixels. 5527 * 5528 * @hide 5529 */ 5530 public int getMarginStart() { 5531 return startMargin; 5532 } 5533 5534 /** 5535 * Returns the end margin in pixels. 5536 * 5537 * @attr ref android.R.styleable#ViewGroup_MarginLayout_layout_marginEnd 5538 * 5539 * @return the end margin in pixels. 5540 * 5541 * @hide 5542 */ 5543 public int getMarginEnd() { 5544 return endMargin; 5545 } 5546 5547 /** 5548 * Check if margins are relative. 5549 * 5550 * @attr ref android.R.styleable#ViewGroup_MarginLayout_layout_marginStart 5551 * @attr ref android.R.styleable#ViewGroup_MarginLayout_layout_marginEnd 5552 * 5553 * @return true if either marginStart or marginEnd has been set 5554 * 5555 * @hide 5556 */ 5557 public boolean isMarginRelative() { 5558 return (startMargin != DEFAULT_RELATIVE) || (endMargin != DEFAULT_RELATIVE); 5559 } 5560 5561 /** 5562 * This will be called by {@link android.view.View#requestLayout()}. Left and Right margins 5563 * maybe overriden depending on layout direction. 5564 * 5565 * @hide 5566 */ 5567 @Override 5568 protected void resolveWithDirection(int layoutDirection) { 5569 switch(layoutDirection) { 5570 case View.LAYOUT_DIRECTION_RTL: 5571 leftMargin = (endMargin > DEFAULT_RELATIVE) ? endMargin : leftMargin; 5572 rightMargin = (startMargin > DEFAULT_RELATIVE) ? startMargin : rightMargin; 5573 break; 5574 case View.LAYOUT_DIRECTION_LTR: 5575 default: 5576 leftMargin = (startMargin > DEFAULT_RELATIVE) ? startMargin : leftMargin; 5577 rightMargin = (endMargin > DEFAULT_RELATIVE) ? endMargin : rightMargin; 5578 break; 5579 } 5580 } 5581 } 5582 5583 /* Describes a touched view and the ids of the pointers that it has captured. 5584 * 5585 * This code assumes that pointer ids are always in the range 0..31 such that 5586 * it can use a bitfield to track which pointer ids are present. 5587 * As it happens, the lower layers of the input dispatch pipeline also use the 5588 * same trick so the assumption should be safe here... 5589 */ 5590 private static final class TouchTarget { 5591 private static final int MAX_RECYCLED = 32; 5592 private static final Object sRecycleLock = new Object(); 5593 private static TouchTarget sRecycleBin; 5594 private static int sRecycledCount; 5595 5596 public static final int ALL_POINTER_IDS = -1; // all ones 5597 5598 // The touched child view. 5599 public View child; 5600 5601 // The combined bit mask of pointer ids for all pointers captured by the target. 5602 public int pointerIdBits; 5603 5604 // The next target in the target list. 5605 public TouchTarget next; 5606 5607 private TouchTarget() { 5608 } 5609 5610 public static TouchTarget obtain(View child, int pointerIdBits) { 5611 final TouchTarget target; 5612 synchronized (sRecycleLock) { 5613 if (sRecycleBin == null) { 5614 target = new TouchTarget(); 5615 } else { 5616 target = sRecycleBin; 5617 sRecycleBin = target.next; 5618 sRecycledCount--; 5619 target.next = null; 5620 } 5621 } 5622 target.child = child; 5623 target.pointerIdBits = pointerIdBits; 5624 return target; 5625 } 5626 5627 public void recycle() { 5628 synchronized (sRecycleLock) { 5629 if (sRecycledCount < MAX_RECYCLED) { 5630 next = sRecycleBin; 5631 sRecycleBin = this; 5632 sRecycledCount += 1; 5633 } else { 5634 next = null; 5635 } 5636 child = null; 5637 } 5638 } 5639 } 5640 5641 /* Describes a hovered view. */ 5642 private static final class HoverTarget { 5643 private static final int MAX_RECYCLED = 32; 5644 private static final Object sRecycleLock = new Object(); 5645 private static HoverTarget sRecycleBin; 5646 private static int sRecycledCount; 5647 5648 // The hovered child view. 5649 public View child; 5650 5651 // The next target in the target list. 5652 public HoverTarget next; 5653 5654 private HoverTarget() { 5655 } 5656 5657 public static HoverTarget obtain(View child) { 5658 final HoverTarget target; 5659 synchronized (sRecycleLock) { 5660 if (sRecycleBin == null) { 5661 target = new HoverTarget(); 5662 } else { 5663 target = sRecycleBin; 5664 sRecycleBin = target.next; 5665 sRecycledCount--; 5666 target.next = null; 5667 } 5668 } 5669 target.child = child; 5670 return target; 5671 } 5672 5673 public void recycle() { 5674 synchronized (sRecycleLock) { 5675 if (sRecycledCount < MAX_RECYCLED) { 5676 next = sRecycleBin; 5677 sRecycleBin = this; 5678 sRecycledCount += 1; 5679 } else { 5680 next = null; 5681 } 5682 child = null; 5683 } 5684 } 5685 } 5686} 5687