ViewGroup.java revision 0500b3cfda5192efc09d6d4344b0c6c785c0a815
1/* 2 * Copyright (C) 2006 The Android Open Source Project 3 * 4 * Licensed under the Apache License, Version 2.0 (the "License"); 5 * you may not use this file except in compliance with the License. 6 * You may obtain a copy of the License at 7 * 8 * http://www.apache.org/licenses/LICENSE-2.0 9 * 10 * Unless required by applicable law or agreed to in writing, software 11 * distributed under the License is distributed on an "AS IS" BASIS, 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 13 * See the License for the specific language governing permissions and 14 * limitations under the License. 15 */ 16 17package android.view; 18 19import android.animation.LayoutTransition; 20import android.content.Context; 21import android.content.res.Configuration; 22import android.content.res.TypedArray; 23import android.graphics.Bitmap; 24import android.graphics.Canvas; 25import android.graphics.Matrix; 26import android.graphics.Paint; 27import android.graphics.PointF; 28import android.graphics.Rect; 29import android.graphics.RectF; 30import android.graphics.Region; 31import android.os.Build; 32import android.os.Parcelable; 33import android.os.SystemClock; 34import android.util.AttributeSet; 35import android.util.Log; 36import android.util.SparseArray; 37import android.view.accessibility.AccessibilityEvent; 38import android.view.accessibility.AccessibilityNodeInfo; 39import android.view.animation.Animation; 40import android.view.animation.AnimationUtils; 41import android.view.animation.LayoutAnimationController; 42import android.view.animation.Transformation; 43 44import com.android.internal.R; 45import com.android.internal.util.Predicate; 46 47import java.util.ArrayList; 48import java.util.HashSet; 49 50/** 51 * <p> 52 * A <code>ViewGroup</code> is a special view that can contain other views 53 * (called children.) The view group is the base class for layouts and views 54 * containers. This class also defines the 55 * {@link android.view.ViewGroup.LayoutParams} class which serves as the base 56 * class for layouts parameters. 57 * </p> 58 * 59 * <p> 60 * Also see {@link LayoutParams} for layout attributes. 61 * </p> 62 * 63 * <div class="special reference"> 64 * <h3>Developer Guides</h3> 65 * <p>For more information about creating user interface layouts, read the 66 * <a href="{@docRoot}guide/topics/ui/declaring-layout.html">XML Layouts</a> developer 67 * guide.</p></div> 68 * 69 * @attr ref android.R.styleable#ViewGroup_clipChildren 70 * @attr ref android.R.styleable#ViewGroup_clipToPadding 71 * @attr ref android.R.styleable#ViewGroup_layoutAnimation 72 * @attr ref android.R.styleable#ViewGroup_animationCache 73 * @attr ref android.R.styleable#ViewGroup_persistentDrawingCache 74 * @attr ref android.R.styleable#ViewGroup_alwaysDrawnWithCache 75 * @attr ref android.R.styleable#ViewGroup_addStatesFromChildren 76 * @attr ref android.R.styleable#ViewGroup_descendantFocusability 77 * @attr ref android.R.styleable#ViewGroup_animateLayoutChanges 78 */ 79public abstract class ViewGroup extends View implements ViewParent, ViewManager { 80 81 private static final boolean DBG = false; 82 83 /** 84 * Views which have been hidden or removed which need to be animated on 85 * their way out. 86 * This field should be made private, so it is hidden from the SDK. 87 * {@hide} 88 */ 89 protected ArrayList<View> mDisappearingChildren; 90 91 /** 92 * Listener used to propagate events indicating when children are added 93 * and/or removed from a view group. 94 * This field should be made private, so it is hidden from the SDK. 95 * {@hide} 96 */ 97 protected OnHierarchyChangeListener mOnHierarchyChangeListener; 98 99 // The view contained within this ViewGroup that has or contains focus. 100 private View mFocused; 101 102 /** 103 * A Transformation used when drawing children, to 104 * apply on the child being drawn. 105 */ 106 private final Transformation mChildTransformation = new Transformation(); 107 108 /** 109 * Used to track the current invalidation region. 110 */ 111 private RectF mInvalidateRegion; 112 113 /** 114 * A Transformation used to calculate a correct 115 * invalidation area when the application is autoscaled. 116 */ 117 private Transformation mInvalidationTransformation; 118 119 // View currently under an ongoing drag 120 private View mCurrentDragView; 121 122 // Metadata about the ongoing drag 123 private DragEvent mCurrentDrag; 124 private HashSet<View> mDragNotifiedChildren; 125 126 // Does this group have a child that can accept the current drag payload? 127 private boolean mChildAcceptsDrag; 128 129 // Used during drag dispatch 130 private final PointF mLocalPoint = new PointF(); 131 132 // Layout animation 133 private LayoutAnimationController mLayoutAnimationController; 134 private Animation.AnimationListener mAnimationListener; 135 136 // First touch target in the linked list of touch targets. 137 private TouchTarget mFirstTouchTarget; 138 139 // For debugging only. You can see these in hierarchyviewer. 140 @SuppressWarnings({"FieldCanBeLocal", "UnusedDeclaration"}) 141 @ViewDebug.ExportedProperty(category = "events") 142 private long mLastTouchDownTime; 143 @ViewDebug.ExportedProperty(category = "events") 144 private int mLastTouchDownIndex = -1; 145 @SuppressWarnings({"FieldCanBeLocal", "UnusedDeclaration"}) 146 @ViewDebug.ExportedProperty(category = "events") 147 private float mLastTouchDownX; 148 @SuppressWarnings({"FieldCanBeLocal", "UnusedDeclaration"}) 149 @ViewDebug.ExportedProperty(category = "events") 150 private float mLastTouchDownY; 151 152 // First hover target in the linked list of hover targets. 153 // The hover targets are children which have received ACTION_HOVER_ENTER. 154 // They might not have actually handled the hover event, but we will 155 // continue sending hover events to them as long as the pointer remains over 156 // their bounds and the view group does not intercept hover. 157 private HoverTarget mFirstHoverTarget; 158 159 // True if the view group itself received a hover event. 160 // It might not have actually handled the hover event. 161 private boolean mHoveredSelf; 162 163 /** 164 * Internal flags. 165 * 166 * This field should be made private, so it is hidden from the SDK. 167 * {@hide} 168 */ 169 protected int mGroupFlags; 170 171 // When set, ViewGroup invalidates only the child's rectangle 172 // Set by default 173 private static final int FLAG_CLIP_CHILDREN = 0x1; 174 175 // When set, ViewGroup excludes the padding area from the invalidate rectangle 176 // Set by default 177 private static final int FLAG_CLIP_TO_PADDING = 0x2; 178 179 // When set, dispatchDraw() will invoke invalidate(); this is set by drawChild() when 180 // a child needs to be invalidated and FLAG_OPTIMIZE_INVALIDATE is set 181 private static final int FLAG_INVALIDATE_REQUIRED = 0x4; 182 183 // When set, dispatchDraw() will run the layout animation and unset the flag 184 private static final int FLAG_RUN_ANIMATION = 0x8; 185 186 // When set, there is either no layout animation on the ViewGroup or the layout 187 // animation is over 188 // Set by default 189 private static final int FLAG_ANIMATION_DONE = 0x10; 190 191 // If set, this ViewGroup has padding; if unset there is no padding and we don't need 192 // to clip it, even if FLAG_CLIP_TO_PADDING is set 193 private static final int FLAG_PADDING_NOT_NULL = 0x20; 194 195 // When set, this ViewGroup caches its children in a Bitmap before starting a layout animation 196 // Set by default 197 private static final int FLAG_ANIMATION_CACHE = 0x40; 198 199 // When set, this ViewGroup converts calls to invalidate(Rect) to invalidate() during a 200 // layout animation; this avoid clobbering the hierarchy 201 // Automatically set when the layout animation starts, depending on the animation's 202 // characteristics 203 private static final int FLAG_OPTIMIZE_INVALIDATE = 0x80; 204 205 // When set, the next call to drawChild() will clear mChildTransformation's matrix 206 private static final int FLAG_CLEAR_TRANSFORMATION = 0x100; 207 208 // When set, this ViewGroup invokes mAnimationListener.onAnimationEnd() and removes 209 // the children's Bitmap caches if necessary 210 // This flag is set when the layout animation is over (after FLAG_ANIMATION_DONE is set) 211 private static final int FLAG_NOTIFY_ANIMATION_LISTENER = 0x200; 212 213 /** 214 * When set, the drawing method will call {@link #getChildDrawingOrder(int, int)} 215 * to get the index of the child to draw for that iteration. 216 * 217 * @hide 218 */ 219 protected static final int FLAG_USE_CHILD_DRAWING_ORDER = 0x400; 220 221 /** 222 * When set, this ViewGroup supports static transformations on children; this causes 223 * {@link #getChildStaticTransformation(View, android.view.animation.Transformation)} to be 224 * invoked when a child is drawn. 225 * 226 * Any subclass overriding 227 * {@link #getChildStaticTransformation(View, android.view.animation.Transformation)} should 228 * set this flags in {@link #mGroupFlags}. 229 * 230 * {@hide} 231 */ 232 protected static final int FLAG_SUPPORT_STATIC_TRANSFORMATIONS = 0x800; 233 234 // When the previous drawChild() invocation used an alpha value that was lower than 235 // 1.0 and set it in mCachePaint 236 private static final int FLAG_ALPHA_LOWER_THAN_ONE = 0x1000; 237 238 /** 239 * When set, this ViewGroup's drawable states also include those 240 * of its children. 241 */ 242 private static final int FLAG_ADD_STATES_FROM_CHILDREN = 0x2000; 243 244 /** 245 * When set, this ViewGroup tries to always draw its children using their drawing cache. 246 */ 247 private static final int FLAG_ALWAYS_DRAWN_WITH_CACHE = 0x4000; 248 249 /** 250 * When set, and if FLAG_ALWAYS_DRAWN_WITH_CACHE is not set, this ViewGroup will try to 251 * draw its children with their drawing cache. 252 */ 253 private static final int FLAG_CHILDREN_DRAWN_WITH_CACHE = 0x8000; 254 255 /** 256 * When set, this group will go through its list of children to notify them of 257 * any drawable state change. 258 */ 259 private static final int FLAG_NOTIFY_CHILDREN_ON_DRAWABLE_STATE_CHANGE = 0x10000; 260 261 private static final int FLAG_MASK_FOCUSABILITY = 0x60000; 262 263 /** 264 * This view will get focus before any of its descendants. 265 */ 266 public static final int FOCUS_BEFORE_DESCENDANTS = 0x20000; 267 268 /** 269 * This view will get focus only if none of its descendants want it. 270 */ 271 public static final int FOCUS_AFTER_DESCENDANTS = 0x40000; 272 273 /** 274 * This view will block any of its descendants from getting focus, even 275 * if they are focusable. 276 */ 277 public static final int FOCUS_BLOCK_DESCENDANTS = 0x60000; 278 279 /** 280 * Used to map between enum in attrubutes and flag values. 281 */ 282 private static final int[] DESCENDANT_FOCUSABILITY_FLAGS = 283 {FOCUS_BEFORE_DESCENDANTS, FOCUS_AFTER_DESCENDANTS, 284 FOCUS_BLOCK_DESCENDANTS}; 285 286 /** 287 * When set, this ViewGroup should not intercept touch events. 288 * {@hide} 289 */ 290 protected static final int FLAG_DISALLOW_INTERCEPT = 0x80000; 291 292 /** 293 * When set, this ViewGroup will split MotionEvents to multiple child Views when appropriate. 294 */ 295 private static final int FLAG_SPLIT_MOTION_EVENTS = 0x200000; 296 297 /** 298 * When set, this ViewGroup will not dispatch onAttachedToWindow calls 299 * to children when adding new views. This is used to prevent multiple 300 * onAttached calls when a ViewGroup adds children in its own onAttached method. 301 */ 302 private static final int FLAG_PREVENT_DISPATCH_ATTACHED_TO_WINDOW = 0x400000; 303 304 /** 305 * Indicates which types of drawing caches are to be kept in memory. 306 * This field should be made private, so it is hidden from the SDK. 307 * {@hide} 308 */ 309 protected int mPersistentDrawingCache; 310 311 /** 312 * Used to indicate that no drawing cache should be kept in memory. 313 */ 314 public static final int PERSISTENT_NO_CACHE = 0x0; 315 316 /** 317 * Used to indicate that the animation drawing cache should be kept in memory. 318 */ 319 public static final int PERSISTENT_ANIMATION_CACHE = 0x1; 320 321 /** 322 * Used to indicate that the scrolling drawing cache should be kept in memory. 323 */ 324 public static final int PERSISTENT_SCROLLING_CACHE = 0x2; 325 326 /** 327 * Used to indicate that all drawing caches should be kept in memory. 328 */ 329 public static final int PERSISTENT_ALL_CACHES = 0x3; 330 331 /** 332 * We clip to padding when FLAG_CLIP_TO_PADDING and FLAG_PADDING_NOT_NULL 333 * are set at the same time. 334 */ 335 protected static final int CLIP_TO_PADDING_MASK = FLAG_CLIP_TO_PADDING | FLAG_PADDING_NOT_NULL; 336 337 // Index of the child's left position in the mLocation array 338 private static final int CHILD_LEFT_INDEX = 0; 339 // Index of the child's top position in the mLocation array 340 private static final int CHILD_TOP_INDEX = 1; 341 342 // Child views of this ViewGroup 343 private View[] mChildren; 344 // Number of valid children in the mChildren array, the rest should be null or not 345 // considered as children 346 347 private boolean mLayoutSuppressed = false; 348 349 private int mChildrenCount; 350 351 private static final int ARRAY_INITIAL_CAPACITY = 12; 352 private static final int ARRAY_CAPACITY_INCREMENT = 12; 353 354 // Used to draw cached views 355 private Paint mCachePaint; 356 357 // Used to animate add/remove changes in layout 358 private LayoutTransition mTransition; 359 360 // The set of views that are currently being transitioned. This list is used to track views 361 // being removed that should not actually be removed from the parent yet because they are 362 // being animated. 363 private ArrayList<View> mTransitioningViews; 364 365 // List of children changing visibility. This is used to potentially keep rendering 366 // views during a transition when they otherwise would have become gone/invisible 367 private ArrayList<View> mVisibilityChangingChildren; 368 369 // Indicates whether this container will use its children layers to draw 370 @ViewDebug.ExportedProperty(category = "drawing") 371 private boolean mDrawLayers = true; 372 373 public ViewGroup(Context context) { 374 super(context); 375 initViewGroup(); 376 } 377 378 public ViewGroup(Context context, AttributeSet attrs) { 379 super(context, attrs); 380 initViewGroup(); 381 initFromAttributes(context, attrs); 382 } 383 384 public ViewGroup(Context context, AttributeSet attrs, int defStyle) { 385 super(context, attrs, defStyle); 386 initViewGroup(); 387 initFromAttributes(context, attrs); 388 } 389 390 private void initViewGroup() { 391 // ViewGroup doesn't draw by default 392 setFlags(WILL_NOT_DRAW, DRAW_MASK); 393 mGroupFlags |= FLAG_CLIP_CHILDREN; 394 mGroupFlags |= FLAG_CLIP_TO_PADDING; 395 mGroupFlags |= FLAG_ANIMATION_DONE; 396 mGroupFlags |= FLAG_ANIMATION_CACHE; 397 mGroupFlags |= FLAG_ALWAYS_DRAWN_WITH_CACHE; 398 399 if (mContext.getApplicationInfo().targetSdkVersion >= Build.VERSION_CODES.HONEYCOMB) { 400 mGroupFlags |= FLAG_SPLIT_MOTION_EVENTS; 401 } 402 403 setDescendantFocusability(FOCUS_BEFORE_DESCENDANTS); 404 405 mChildren = new View[ARRAY_INITIAL_CAPACITY]; 406 mChildrenCount = 0; 407 408 mPersistentDrawingCache = PERSISTENT_SCROLLING_CACHE; 409 } 410 411 private void initFromAttributes(Context context, AttributeSet attrs) { 412 TypedArray a = context.obtainStyledAttributes(attrs, 413 R.styleable.ViewGroup); 414 415 final int N = a.getIndexCount(); 416 for (int i = 0; i < N; i++) { 417 int attr = a.getIndex(i); 418 switch (attr) { 419 case R.styleable.ViewGroup_clipChildren: 420 setClipChildren(a.getBoolean(attr, true)); 421 break; 422 case R.styleable.ViewGroup_clipToPadding: 423 setClipToPadding(a.getBoolean(attr, true)); 424 break; 425 case R.styleable.ViewGroup_animationCache: 426 setAnimationCacheEnabled(a.getBoolean(attr, true)); 427 break; 428 case R.styleable.ViewGroup_persistentDrawingCache: 429 setPersistentDrawingCache(a.getInt(attr, PERSISTENT_SCROLLING_CACHE)); 430 break; 431 case R.styleable.ViewGroup_addStatesFromChildren: 432 setAddStatesFromChildren(a.getBoolean(attr, false)); 433 break; 434 case R.styleable.ViewGroup_alwaysDrawnWithCache: 435 setAlwaysDrawnWithCacheEnabled(a.getBoolean(attr, true)); 436 break; 437 case R.styleable.ViewGroup_layoutAnimation: 438 int id = a.getResourceId(attr, -1); 439 if (id > 0) { 440 setLayoutAnimation(AnimationUtils.loadLayoutAnimation(mContext, id)); 441 } 442 break; 443 case R.styleable.ViewGroup_descendantFocusability: 444 setDescendantFocusability(DESCENDANT_FOCUSABILITY_FLAGS[a.getInt(attr, 0)]); 445 break; 446 case R.styleable.ViewGroup_splitMotionEvents: 447 setMotionEventSplittingEnabled(a.getBoolean(attr, false)); 448 break; 449 case R.styleable.ViewGroup_animateLayoutChanges: 450 boolean animateLayoutChanges = a.getBoolean(attr, false); 451 if (animateLayoutChanges) { 452 setLayoutTransition(new LayoutTransition()); 453 } 454 break; 455 } 456 } 457 458 a.recycle(); 459 } 460 461 /** 462 * Gets the descendant focusability of this view group. The descendant 463 * focusability defines the relationship between this view group and its 464 * descendants when looking for a view to take focus in 465 * {@link #requestFocus(int, android.graphics.Rect)}. 466 * 467 * @return one of {@link #FOCUS_BEFORE_DESCENDANTS}, {@link #FOCUS_AFTER_DESCENDANTS}, 468 * {@link #FOCUS_BLOCK_DESCENDANTS}. 469 */ 470 @ViewDebug.ExportedProperty(category = "focus", mapping = { 471 @ViewDebug.IntToString(from = FOCUS_BEFORE_DESCENDANTS, to = "FOCUS_BEFORE_DESCENDANTS"), 472 @ViewDebug.IntToString(from = FOCUS_AFTER_DESCENDANTS, to = "FOCUS_AFTER_DESCENDANTS"), 473 @ViewDebug.IntToString(from = FOCUS_BLOCK_DESCENDANTS, to = "FOCUS_BLOCK_DESCENDANTS") 474 }) 475 public int getDescendantFocusability() { 476 return mGroupFlags & FLAG_MASK_FOCUSABILITY; 477 } 478 479 /** 480 * Set the descendant focusability of this view group. This defines the relationship 481 * between this view group and its descendants when looking for a view to 482 * take focus in {@link #requestFocus(int, android.graphics.Rect)}. 483 * 484 * @param focusability one of {@link #FOCUS_BEFORE_DESCENDANTS}, {@link #FOCUS_AFTER_DESCENDANTS}, 485 * {@link #FOCUS_BLOCK_DESCENDANTS}. 486 */ 487 public void setDescendantFocusability(int focusability) { 488 switch (focusability) { 489 case FOCUS_BEFORE_DESCENDANTS: 490 case FOCUS_AFTER_DESCENDANTS: 491 case FOCUS_BLOCK_DESCENDANTS: 492 break; 493 default: 494 throw new IllegalArgumentException("must be one of FOCUS_BEFORE_DESCENDANTS, " 495 + "FOCUS_AFTER_DESCENDANTS, FOCUS_BLOCK_DESCENDANTS"); 496 } 497 mGroupFlags &= ~FLAG_MASK_FOCUSABILITY; 498 mGroupFlags |= (focusability & FLAG_MASK_FOCUSABILITY); 499 } 500 501 /** 502 * {@inheritDoc} 503 */ 504 @Override 505 void handleFocusGainInternal(int direction, Rect previouslyFocusedRect) { 506 if (mFocused != null) { 507 mFocused.unFocus(); 508 mFocused = null; 509 } 510 super.handleFocusGainInternal(direction, previouslyFocusedRect); 511 } 512 513 /** 514 * {@inheritDoc} 515 */ 516 public void requestChildFocus(View child, View focused) { 517 if (DBG) { 518 System.out.println(this + " requestChildFocus()"); 519 } 520 if (getDescendantFocusability() == FOCUS_BLOCK_DESCENDANTS) { 521 return; 522 } 523 524 // Unfocus us, if necessary 525 super.unFocus(); 526 527 // We had a previous notion of who had focus. Clear it. 528 if (mFocused != child) { 529 if (mFocused != null) { 530 mFocused.unFocus(); 531 } 532 533 mFocused = child; 534 } 535 if (mParent != null) { 536 mParent.requestChildFocus(this, focused); 537 } 538 } 539 540 /** 541 * {@inheritDoc} 542 */ 543 public void focusableViewAvailable(View v) { 544 if (mParent != null 545 // shortcut: don't report a new focusable view if we block our descendants from 546 // getting focus 547 && (getDescendantFocusability() != FOCUS_BLOCK_DESCENDANTS) 548 // shortcut: don't report a new focusable view if we already are focused 549 // (and we don't prefer our descendants) 550 // 551 // note: knowing that mFocused is non-null is not a good enough reason 552 // to break the traversal since in that case we'd actually have to find 553 // the focused view and make sure it wasn't FOCUS_AFTER_DESCENDANTS and 554 // an ancestor of v; this will get checked for at ViewAncestor 555 && !(isFocused() && getDescendantFocusability() != FOCUS_AFTER_DESCENDANTS)) { 556 mParent.focusableViewAvailable(v); 557 } 558 } 559 560 /** 561 * {@inheritDoc} 562 */ 563 public boolean showContextMenuForChild(View originalView) { 564 return mParent != null && mParent.showContextMenuForChild(originalView); 565 } 566 567 /** 568 * {@inheritDoc} 569 */ 570 public ActionMode startActionModeForChild(View originalView, ActionMode.Callback callback) { 571 return mParent != null ? mParent.startActionModeForChild(originalView, callback) : null; 572 } 573 574 /** 575 * Find the nearest view in the specified direction that wants to take 576 * focus. 577 * 578 * @param focused The view that currently has focus 579 * @param direction One of FOCUS_UP, FOCUS_DOWN, FOCUS_LEFT, and 580 * FOCUS_RIGHT, or 0 for not applicable. 581 */ 582 public View focusSearch(View focused, int direction) { 583 if (isRootNamespace()) { 584 // root namespace means we should consider ourselves the top of the 585 // tree for focus searching; otherwise we could be focus searching 586 // into other tabs. see LocalActivityManager and TabHost for more info 587 return FocusFinder.getInstance().findNextFocus(this, focused, direction); 588 } else if (mParent != null) { 589 return mParent.focusSearch(focused, direction); 590 } 591 return null; 592 } 593 594 /** 595 * {@inheritDoc} 596 */ 597 public boolean requestChildRectangleOnScreen(View child, Rect rectangle, boolean immediate) { 598 return false; 599 } 600 601 /** 602 * {@inheritDoc} 603 */ 604 public boolean requestSendAccessibilityEvent(View child, AccessibilityEvent event) { 605 ViewParent parent = getParent(); 606 if (parent == null) { 607 return false; 608 } 609 final boolean propagate = onRequestSendAccessibilityEvent(child, event); 610 //noinspection SimplifiableIfStatement 611 if (!propagate) { 612 return false; 613 } 614 return parent.requestSendAccessibilityEvent(this, event); 615 } 616 617 /** 618 * Called when a child has requested sending an {@link AccessibilityEvent} and 619 * gives an opportunity to its parent to augment the event. 620 * <p> 621 * If an {@link android.view.View.AccessibilityDelegate} has been specified via calling 622 * {@link android.view.View#setAccessibilityDelegate(android.view.View.AccessibilityDelegate)} its 623 * {@link android.view.View.AccessibilityDelegate#onRequestSendAccessibilityEvent(ViewGroup, View, AccessibilityEvent)} 624 * is responsible for handling this call. 625 * </p> 626 * 627 * @param child The child which requests sending the event. 628 * @param event The event to be sent. 629 * @return True if the event should be sent. 630 * 631 * @see #requestSendAccessibilityEvent(View, AccessibilityEvent) 632 */ 633 public boolean onRequestSendAccessibilityEvent(View child, AccessibilityEvent event) { 634 if (mAccessibilityDelegate != null) { 635 return mAccessibilityDelegate.onRequestSendAccessibilityEvent(this, child, event); 636 } else { 637 return onRequestSendAccessibilityEventInternal(child, event); 638 } 639 } 640 641 /** 642 * @see #onRequestSendAccessibilityEvent(View, AccessibilityEvent) 643 * 644 * Note: Called from the default {@link View.AccessibilityDelegate}. 645 */ 646 boolean onRequestSendAccessibilityEventInternal(View child, AccessibilityEvent event) { 647 return true; 648 } 649 650 /** 651 * {@inheritDoc} 652 */ 653 @Override 654 public boolean dispatchUnhandledMove(View focused, int direction) { 655 return mFocused != null && 656 mFocused.dispatchUnhandledMove(focused, direction); 657 } 658 659 /** 660 * {@inheritDoc} 661 */ 662 public void clearChildFocus(View child) { 663 if (DBG) { 664 System.out.println(this + " clearChildFocus()"); 665 } 666 667 mFocused = null; 668 if (mParent != null) { 669 mParent.clearChildFocus(this); 670 } 671 } 672 673 /** 674 * {@inheritDoc} 675 */ 676 @Override 677 public void clearFocus() { 678 super.clearFocus(); 679 680 // clear any child focus if it exists 681 if (mFocused != null) { 682 mFocused.clearFocus(); 683 } 684 } 685 686 /** 687 * {@inheritDoc} 688 */ 689 @Override 690 void unFocus() { 691 if (DBG) { 692 System.out.println(this + " unFocus()"); 693 } 694 695 super.unFocus(); 696 if (mFocused != null) { 697 mFocused.unFocus(); 698 } 699 mFocused = null; 700 } 701 702 /** 703 * Returns the focused child of this view, if any. The child may have focus 704 * or contain focus. 705 * 706 * @return the focused child or null. 707 */ 708 public View getFocusedChild() { 709 return mFocused; 710 } 711 712 /** 713 * Returns true if this view has or contains focus 714 * 715 * @return true if this view has or contains focus 716 */ 717 @Override 718 public boolean hasFocus() { 719 return (mPrivateFlags & FOCUSED) != 0 || mFocused != null; 720 } 721 722 /* 723 * (non-Javadoc) 724 * 725 * @see android.view.View#findFocus() 726 */ 727 @Override 728 public View findFocus() { 729 if (DBG) { 730 System.out.println("Find focus in " + this + ": flags=" 731 + isFocused() + ", child=" + mFocused); 732 } 733 734 if (isFocused()) { 735 return this; 736 } 737 738 if (mFocused != null) { 739 return mFocused.findFocus(); 740 } 741 return null; 742 } 743 744 /** 745 * {@inheritDoc} 746 */ 747 @Override 748 public boolean hasFocusable() { 749 if ((mViewFlags & VISIBILITY_MASK) != VISIBLE) { 750 return false; 751 } 752 753 if (isFocusable()) { 754 return true; 755 } 756 757 final int descendantFocusability = getDescendantFocusability(); 758 if (descendantFocusability != FOCUS_BLOCK_DESCENDANTS) { 759 final int count = mChildrenCount; 760 final View[] children = mChildren; 761 762 for (int i = 0; i < count; i++) { 763 final View child = children[i]; 764 if (child.hasFocusable()) { 765 return true; 766 } 767 } 768 } 769 770 return false; 771 } 772 773 /** 774 * {@inheritDoc} 775 */ 776 @Override 777 public void addFocusables(ArrayList<View> views, int direction) { 778 addFocusables(views, direction, FOCUSABLES_TOUCH_MODE); 779 } 780 781 /** 782 * {@inheritDoc} 783 */ 784 @Override 785 public void addFocusables(ArrayList<View> views, int direction, int focusableMode) { 786 final int focusableCount = views.size(); 787 788 final int descendantFocusability = getDescendantFocusability(); 789 790 if (descendantFocusability != FOCUS_BLOCK_DESCENDANTS) { 791 final int count = mChildrenCount; 792 final View[] children = mChildren; 793 794 for (int i = 0; i < count; i++) { 795 final View child = children[i]; 796 if ((child.mViewFlags & VISIBILITY_MASK) == VISIBLE) { 797 child.addFocusables(views, direction, focusableMode); 798 } 799 } 800 } 801 802 // we add ourselves (if focusable) in all cases except for when we are 803 // FOCUS_AFTER_DESCENDANTS and there are some descendants focusable. this is 804 // to avoid the focus search finding layouts when a more precise search 805 // among the focusable children would be more interesting. 806 if ( 807 descendantFocusability != FOCUS_AFTER_DESCENDANTS || 808 // No focusable descendants 809 (focusableCount == views.size())) { 810 super.addFocusables(views, direction, focusableMode); 811 } 812 } 813 814 @Override 815 public void findViewsWithText(ArrayList<View> outViews, CharSequence text, int flags) { 816 super.findViewsWithText(outViews, text, flags); 817 final int childrenCount = mChildrenCount; 818 final View[] children = mChildren; 819 for (int i = 0; i < childrenCount; i++) { 820 View child = children[i]; 821 if ((child.mViewFlags & VISIBILITY_MASK) == VISIBLE 822 && (child.mPrivateFlags & IS_ROOT_NAMESPACE) == 0) { 823 child.findViewsWithText(outViews, text, flags); 824 } 825 } 826 } 827 828 @Override 829 View findViewByAccessibilityIdTraversal(int accessibilityId) { 830 View foundView = super.findViewByAccessibilityIdTraversal(accessibilityId); 831 if (foundView != null) { 832 return foundView; 833 } 834 final int childrenCount = mChildrenCount; 835 final View[] children = mChildren; 836 for (int i = 0; i < childrenCount; i++) { 837 View child = children[i]; 838 foundView = child.findViewByAccessibilityIdTraversal(accessibilityId); 839 if (foundView != null) { 840 return foundView; 841 } 842 } 843 return null; 844 } 845 846 /** 847 * {@inheritDoc} 848 */ 849 @Override 850 public void dispatchWindowFocusChanged(boolean hasFocus) { 851 super.dispatchWindowFocusChanged(hasFocus); 852 final int count = mChildrenCount; 853 final View[] children = mChildren; 854 for (int i = 0; i < count; i++) { 855 children[i].dispatchWindowFocusChanged(hasFocus); 856 } 857 } 858 859 /** 860 * {@inheritDoc} 861 */ 862 @Override 863 public void addTouchables(ArrayList<View> views) { 864 super.addTouchables(views); 865 866 final int count = mChildrenCount; 867 final View[] children = mChildren; 868 869 for (int i = 0; i < count; i++) { 870 final View child = children[i]; 871 if ((child.mViewFlags & VISIBILITY_MASK) == VISIBLE) { 872 child.addTouchables(views); 873 } 874 } 875 } 876 877 /** 878 * {@inheritDoc} 879 */ 880 @Override 881 public void dispatchDisplayHint(int hint) { 882 super.dispatchDisplayHint(hint); 883 final int count = mChildrenCount; 884 final View[] children = mChildren; 885 for (int i = 0; i < count; i++) { 886 children[i].dispatchDisplayHint(hint); 887 } 888 } 889 890 /** 891 * @hide 892 * @param child 893 * @param visibility 894 */ 895 protected void onChildVisibilityChanged(View child, int visibility) { 896 if (mTransition != null) { 897 if (visibility == VISIBLE) { 898 mTransition.showChild(this, child); 899 } else { 900 mTransition.hideChild(this, child); 901 } 902 if (visibility != VISIBLE) { 903 // Only track this on disappearing views - appearing views are already visible 904 // and don't need special handling during drawChild() 905 if (mVisibilityChangingChildren == null) { 906 mVisibilityChangingChildren = new ArrayList<View>(); 907 } 908 mVisibilityChangingChildren.add(child); 909 if (mTransitioningViews != null && mTransitioningViews.contains(child)) { 910 addDisappearingView(child); 911 } 912 } 913 } 914 915 // in all cases, for drags 916 if (mCurrentDrag != null) { 917 if (visibility == VISIBLE) { 918 notifyChildOfDrag(child); 919 } 920 } 921 } 922 923 /** 924 * {@inheritDoc} 925 */ 926 @Override 927 protected void dispatchVisibilityChanged(View changedView, int visibility) { 928 super.dispatchVisibilityChanged(changedView, visibility); 929 final int count = mChildrenCount; 930 final View[] children = mChildren; 931 for (int i = 0; i < count; i++) { 932 children[i].dispatchVisibilityChanged(changedView, visibility); 933 } 934 } 935 936 /** 937 * {@inheritDoc} 938 */ 939 @Override 940 public void dispatchWindowVisibilityChanged(int visibility) { 941 super.dispatchWindowVisibilityChanged(visibility); 942 final int count = mChildrenCount; 943 final View[] children = mChildren; 944 for (int i = 0; i < count; i++) { 945 children[i].dispatchWindowVisibilityChanged(visibility); 946 } 947 } 948 949 /** 950 * {@inheritDoc} 951 */ 952 @Override 953 public void dispatchConfigurationChanged(Configuration newConfig) { 954 super.dispatchConfigurationChanged(newConfig); 955 final int count = mChildrenCount; 956 final View[] children = mChildren; 957 for (int i = 0; i < count; i++) { 958 children[i].dispatchConfigurationChanged(newConfig); 959 } 960 } 961 962 /** 963 * {@inheritDoc} 964 */ 965 public void recomputeViewAttributes(View child) { 966 if (mAttachInfo != null && !mAttachInfo.mRecomputeGlobalAttributes) { 967 ViewParent parent = mParent; 968 if (parent != null) parent.recomputeViewAttributes(this); 969 } 970 } 971 972 @Override 973 void dispatchCollectViewAttributes(int visibility) { 974 visibility |= mViewFlags&VISIBILITY_MASK; 975 super.dispatchCollectViewAttributes(visibility); 976 final int count = mChildrenCount; 977 final View[] children = mChildren; 978 for (int i = 0; i < count; i++) { 979 children[i].dispatchCollectViewAttributes(visibility); 980 } 981 } 982 983 /** 984 * {@inheritDoc} 985 */ 986 public void bringChildToFront(View child) { 987 int index = indexOfChild(child); 988 if (index >= 0) { 989 removeFromArray(index); 990 addInArray(child, mChildrenCount); 991 child.mParent = this; 992 } 993 } 994 995 /** 996 * {@inheritDoc} 997 * 998 * !!! TODO: write real docs 999 */ 1000 @Override 1001 public boolean dispatchDragEvent(DragEvent event) { 1002 boolean retval = false; 1003 final float tx = event.mX; 1004 final float ty = event.mY; 1005 1006 ViewRootImpl root = getViewRootImpl(); 1007 1008 // Dispatch down the view hierarchy 1009 switch (event.mAction) { 1010 case DragEvent.ACTION_DRAG_STARTED: { 1011 // clear state to recalculate which views we drag over 1012 mCurrentDragView = null; 1013 1014 // Set up our tracking of drag-started notifications 1015 mCurrentDrag = DragEvent.obtain(event); 1016 if (mDragNotifiedChildren == null) { 1017 mDragNotifiedChildren = new HashSet<View>(); 1018 } else { 1019 mDragNotifiedChildren.clear(); 1020 } 1021 1022 // Now dispatch down to our children, caching the responses 1023 mChildAcceptsDrag = false; 1024 final int count = mChildrenCount; 1025 final View[] children = mChildren; 1026 for (int i = 0; i < count; i++) { 1027 final View child = children[i]; 1028 child.mPrivateFlags2 &= ~View.DRAG_MASK; 1029 if (child.getVisibility() == VISIBLE) { 1030 final boolean handled = notifyChildOfDrag(children[i]); 1031 if (handled) { 1032 mChildAcceptsDrag = true; 1033 } 1034 } 1035 } 1036 1037 // Return HANDLED if one of our children can accept the drag 1038 if (mChildAcceptsDrag) { 1039 retval = true; 1040 } 1041 } break; 1042 1043 case DragEvent.ACTION_DRAG_ENDED: { 1044 // Release the bookkeeping now that the drag lifecycle has ended 1045 if (mDragNotifiedChildren != null) { 1046 for (View child : mDragNotifiedChildren) { 1047 // If a child was notified about an ongoing drag, it's told that it's over 1048 child.dispatchDragEvent(event); 1049 child.mPrivateFlags2 &= ~View.DRAG_MASK; 1050 child.refreshDrawableState(); 1051 } 1052 1053 mDragNotifiedChildren.clear(); 1054 mCurrentDrag.recycle(); 1055 mCurrentDrag = null; 1056 } 1057 1058 // We consider drag-ended to have been handled if one of our children 1059 // had offered to handle the drag. 1060 if (mChildAcceptsDrag) { 1061 retval = true; 1062 } 1063 } break; 1064 1065 case DragEvent.ACTION_DRAG_LOCATION: { 1066 // Find the [possibly new] drag target 1067 final View target = findFrontmostDroppableChildAt(event.mX, event.mY, mLocalPoint); 1068 1069 // If we've changed apparent drag target, tell the view root which view 1070 // we're over now [for purposes of the eventual drag-recipient-changed 1071 // notifications to the framework] and tell the new target that the drag 1072 // has entered its bounds. The root will see setDragFocus() calls all 1073 // the way down to the final leaf view that is handling the LOCATION event 1074 // before reporting the new potential recipient to the framework. 1075 if (mCurrentDragView != target) { 1076 root.setDragFocus(target); 1077 1078 final int action = event.mAction; 1079 // If we've dragged off of a child view, send it the EXITED message 1080 if (mCurrentDragView != null) { 1081 final View view = mCurrentDragView; 1082 event.mAction = DragEvent.ACTION_DRAG_EXITED; 1083 view.dispatchDragEvent(event); 1084 view.mPrivateFlags2 &= ~View.DRAG_HOVERED; 1085 view.refreshDrawableState(); 1086 } 1087 mCurrentDragView = target; 1088 1089 // If we've dragged over a new child view, send it the ENTERED message 1090 if (target != null) { 1091 event.mAction = DragEvent.ACTION_DRAG_ENTERED; 1092 target.dispatchDragEvent(event); 1093 target.mPrivateFlags2 |= View.DRAG_HOVERED; 1094 target.refreshDrawableState(); 1095 } 1096 event.mAction = action; // restore the event's original state 1097 } 1098 1099 // Dispatch the actual drag location notice, localized into its coordinates 1100 if (target != null) { 1101 event.mX = mLocalPoint.x; 1102 event.mY = mLocalPoint.y; 1103 1104 retval = target.dispatchDragEvent(event); 1105 1106 event.mX = tx; 1107 event.mY = ty; 1108 } 1109 } break; 1110 1111 /* Entered / exited dispatch 1112 * 1113 * DRAG_ENTERED is not dispatched downwards from ViewGroup. The reason for this is 1114 * that we're about to get the corresponding LOCATION event, which we will use to 1115 * determine which of our children is the new target; at that point we will 1116 * push a DRAG_ENTERED down to the new target child [which may itself be a ViewGroup]. 1117 * 1118 * DRAG_EXITED *is* dispatched all the way down immediately: once we know the 1119 * drag has left this ViewGroup, we know by definition that every contained subview 1120 * is also no longer under the drag point. 1121 */ 1122 1123 case DragEvent.ACTION_DRAG_EXITED: { 1124 if (mCurrentDragView != null) { 1125 final View view = mCurrentDragView; 1126 view.dispatchDragEvent(event); 1127 view.mPrivateFlags2 &= ~View.DRAG_HOVERED; 1128 view.refreshDrawableState(); 1129 1130 mCurrentDragView = null; 1131 } 1132 } break; 1133 1134 case DragEvent.ACTION_DROP: { 1135 if (ViewDebug.DEBUG_DRAG) Log.d(View.VIEW_LOG_TAG, "Drop event: " + event); 1136 View target = findFrontmostDroppableChildAt(event.mX, event.mY, mLocalPoint); 1137 if (target != null) { 1138 if (ViewDebug.DEBUG_DRAG) Log.d(View.VIEW_LOG_TAG, " dispatch drop to " + target); 1139 event.mX = mLocalPoint.x; 1140 event.mY = mLocalPoint.y; 1141 retval = target.dispatchDragEvent(event); 1142 event.mX = tx; 1143 event.mY = ty; 1144 } else { 1145 if (ViewDebug.DEBUG_DRAG) { 1146 Log.d(View.VIEW_LOG_TAG, " not dropped on an accepting view"); 1147 } 1148 } 1149 } break; 1150 } 1151 1152 // If none of our children could handle the event, try here 1153 if (!retval) { 1154 // Call up to the View implementation that dispatches to installed listeners 1155 retval = super.dispatchDragEvent(event); 1156 } 1157 return retval; 1158 } 1159 1160 // Find the frontmost child view that lies under the given point, and calculate 1161 // the position within its own local coordinate system. 1162 View findFrontmostDroppableChildAt(float x, float y, PointF outLocalPoint) { 1163 final int count = mChildrenCount; 1164 final View[] children = mChildren; 1165 for (int i = count - 1; i >= 0; i--) { 1166 final View child = children[i]; 1167 if (!child.canAcceptDrag()) { 1168 continue; 1169 } 1170 1171 if (isTransformedTouchPointInView(x, y, child, outLocalPoint)) { 1172 return child; 1173 } 1174 } 1175 return null; 1176 } 1177 1178 boolean notifyChildOfDrag(View child) { 1179 if (ViewDebug.DEBUG_DRAG) { 1180 Log.d(View.VIEW_LOG_TAG, "Sending drag-started to view: " + child); 1181 } 1182 1183 boolean canAccept = false; 1184 if (! mDragNotifiedChildren.contains(child)) { 1185 mDragNotifiedChildren.add(child); 1186 canAccept = child.dispatchDragEvent(mCurrentDrag); 1187 if (canAccept && !child.canAcceptDrag()) { 1188 child.mPrivateFlags2 |= View.DRAG_CAN_ACCEPT; 1189 child.refreshDrawableState(); 1190 } 1191 } 1192 return canAccept; 1193 } 1194 1195 @Override 1196 public void dispatchSystemUiVisibilityChanged(int visible) { 1197 super.dispatchSystemUiVisibilityChanged(visible); 1198 1199 final int count = mChildrenCount; 1200 final View[] children = mChildren; 1201 for (int i=0; i <count; i++) { 1202 final View child = children[i]; 1203 child.dispatchSystemUiVisibilityChanged(visible); 1204 } 1205 } 1206 1207 @Override 1208 void updateLocalSystemUiVisibility(int localValue, int localChanges) { 1209 super.updateLocalSystemUiVisibility(localValue, localChanges); 1210 1211 final int count = mChildrenCount; 1212 final View[] children = mChildren; 1213 for (int i=0; i <count; i++) { 1214 final View child = children[i]; 1215 child.updateLocalSystemUiVisibility(localValue, localChanges); 1216 } 1217 } 1218 1219 /** 1220 * {@inheritDoc} 1221 */ 1222 @Override 1223 public boolean dispatchKeyEventPreIme(KeyEvent event) { 1224 if ((mPrivateFlags & (FOCUSED | HAS_BOUNDS)) == (FOCUSED | HAS_BOUNDS)) { 1225 return super.dispatchKeyEventPreIme(event); 1226 } else if (mFocused != null && (mFocused.mPrivateFlags & HAS_BOUNDS) == HAS_BOUNDS) { 1227 return mFocused.dispatchKeyEventPreIme(event); 1228 } 1229 return false; 1230 } 1231 1232 /** 1233 * {@inheritDoc} 1234 */ 1235 @Override 1236 public boolean dispatchKeyEvent(KeyEvent event) { 1237 if (mInputEventConsistencyVerifier != null) { 1238 mInputEventConsistencyVerifier.onKeyEvent(event, 1); 1239 } 1240 1241 if ((mPrivateFlags & (FOCUSED | HAS_BOUNDS)) == (FOCUSED | HAS_BOUNDS)) { 1242 if (super.dispatchKeyEvent(event)) { 1243 return true; 1244 } 1245 } else if (mFocused != null && (mFocused.mPrivateFlags & HAS_BOUNDS) == HAS_BOUNDS) { 1246 if (mFocused.dispatchKeyEvent(event)) { 1247 return true; 1248 } 1249 } 1250 1251 if (mInputEventConsistencyVerifier != null) { 1252 mInputEventConsistencyVerifier.onUnhandledEvent(event, 1); 1253 } 1254 return false; 1255 } 1256 1257 /** 1258 * {@inheritDoc} 1259 */ 1260 @Override 1261 public boolean dispatchKeyShortcutEvent(KeyEvent event) { 1262 if ((mPrivateFlags & (FOCUSED | HAS_BOUNDS)) == (FOCUSED | HAS_BOUNDS)) { 1263 return super.dispatchKeyShortcutEvent(event); 1264 } else if (mFocused != null && (mFocused.mPrivateFlags & HAS_BOUNDS) == HAS_BOUNDS) { 1265 return mFocused.dispatchKeyShortcutEvent(event); 1266 } 1267 return false; 1268 } 1269 1270 /** 1271 * {@inheritDoc} 1272 */ 1273 @Override 1274 public boolean dispatchTrackballEvent(MotionEvent event) { 1275 if (mInputEventConsistencyVerifier != null) { 1276 mInputEventConsistencyVerifier.onTrackballEvent(event, 1); 1277 } 1278 1279 if ((mPrivateFlags & (FOCUSED | HAS_BOUNDS)) == (FOCUSED | HAS_BOUNDS)) { 1280 if (super.dispatchTrackballEvent(event)) { 1281 return true; 1282 } 1283 } else if (mFocused != null && (mFocused.mPrivateFlags & HAS_BOUNDS) == HAS_BOUNDS) { 1284 if (mFocused.dispatchTrackballEvent(event)) { 1285 return true; 1286 } 1287 } 1288 1289 if (mInputEventConsistencyVerifier != null) { 1290 mInputEventConsistencyVerifier.onUnhandledEvent(event, 1); 1291 } 1292 return false; 1293 } 1294 1295 /** 1296 * {@inheritDoc} 1297 */ 1298 @SuppressWarnings({"ConstantConditions"}) 1299 @Override 1300 protected boolean dispatchHoverEvent(MotionEvent event) { 1301 final int action = event.getAction(); 1302 1303 // First check whether the view group wants to intercept the hover event. 1304 final boolean interceptHover = onInterceptHoverEvent(event); 1305 event.setAction(action); // restore action in case it was changed 1306 1307 MotionEvent eventNoHistory = event; 1308 boolean handled = false; 1309 1310 // Send events to the hovered children and build a new list of hover targets until 1311 // one is found that handles the event. 1312 HoverTarget firstOldHoverTarget = mFirstHoverTarget; 1313 mFirstHoverTarget = null; 1314 if (!interceptHover && action != MotionEvent.ACTION_HOVER_EXIT) { 1315 final float x = event.getX(); 1316 final float y = event.getY(); 1317 final int childrenCount = mChildrenCount; 1318 if (childrenCount != 0) { 1319 final View[] children = mChildren; 1320 HoverTarget lastHoverTarget = null; 1321 for (int i = childrenCount - 1; i >= 0; i--) { 1322 final View child = children[i]; 1323 if (!canViewReceivePointerEvents(child) 1324 || !isTransformedTouchPointInView(x, y, child, null)) { 1325 continue; 1326 } 1327 1328 // Obtain a hover target for this child. Dequeue it from the 1329 // old hover target list if the child was previously hovered. 1330 HoverTarget hoverTarget = firstOldHoverTarget; 1331 final boolean wasHovered; 1332 for (HoverTarget predecessor = null; ;) { 1333 if (hoverTarget == null) { 1334 hoverTarget = HoverTarget.obtain(child); 1335 wasHovered = false; 1336 break; 1337 } 1338 1339 if (hoverTarget.child == child) { 1340 if (predecessor != null) { 1341 predecessor.next = hoverTarget.next; 1342 } else { 1343 firstOldHoverTarget = hoverTarget.next; 1344 } 1345 hoverTarget.next = null; 1346 wasHovered = true; 1347 break; 1348 } 1349 1350 predecessor = hoverTarget; 1351 hoverTarget = hoverTarget.next; 1352 } 1353 1354 // Enqueue the hover target onto the new hover target list. 1355 if (lastHoverTarget != null) { 1356 lastHoverTarget.next = hoverTarget; 1357 } else { 1358 lastHoverTarget = hoverTarget; 1359 mFirstHoverTarget = hoverTarget; 1360 } 1361 1362 // Dispatch the event to the child. 1363 if (action == MotionEvent.ACTION_HOVER_ENTER) { 1364 if (!wasHovered) { 1365 // Send the enter as is. 1366 handled |= dispatchTransformedGenericPointerEvent( 1367 event, child); // enter 1368 } 1369 } else if (action == MotionEvent.ACTION_HOVER_MOVE) { 1370 if (!wasHovered) { 1371 // Synthesize an enter from a move. 1372 eventNoHistory = obtainMotionEventNoHistoryOrSelf(eventNoHistory); 1373 eventNoHistory.setAction(MotionEvent.ACTION_HOVER_ENTER); 1374 handled |= dispatchTransformedGenericPointerEvent( 1375 eventNoHistory, child); // enter 1376 eventNoHistory.setAction(action); 1377 1378 handled |= dispatchTransformedGenericPointerEvent( 1379 eventNoHistory, child); // move 1380 } else { 1381 // Send the move as is. 1382 handled |= dispatchTransformedGenericPointerEvent(event, child); 1383 } 1384 } 1385 if (handled) { 1386 break; 1387 } 1388 } 1389 } 1390 } 1391 1392 // Send exit events to all previously hovered children that are no longer hovered. 1393 while (firstOldHoverTarget != null) { 1394 final View child = firstOldHoverTarget.child; 1395 1396 // Exit the old hovered child. 1397 if (action == MotionEvent.ACTION_HOVER_EXIT) { 1398 // Send the exit as is. 1399 handled |= dispatchTransformedGenericPointerEvent( 1400 event, child); // exit 1401 } else { 1402 // Synthesize an exit from a move or enter. 1403 // Ignore the result because hover focus has moved to a different view. 1404 if (action == MotionEvent.ACTION_HOVER_MOVE) { 1405 dispatchTransformedGenericPointerEvent( 1406 event, child); // move 1407 } 1408 eventNoHistory = obtainMotionEventNoHistoryOrSelf(eventNoHistory); 1409 eventNoHistory.setAction(MotionEvent.ACTION_HOVER_EXIT); 1410 dispatchTransformedGenericPointerEvent( 1411 eventNoHistory, child); // exit 1412 eventNoHistory.setAction(action); 1413 } 1414 1415 final HoverTarget nextOldHoverTarget = firstOldHoverTarget.next; 1416 firstOldHoverTarget.recycle(); 1417 firstOldHoverTarget = nextOldHoverTarget; 1418 } 1419 1420 // Send events to the view group itself if no children have handled it. 1421 boolean newHoveredSelf = !handled; 1422 if (newHoveredSelf == mHoveredSelf) { 1423 if (newHoveredSelf) { 1424 // Send event to the view group as before. 1425 handled |= super.dispatchHoverEvent(event); 1426 } 1427 } else { 1428 if (mHoveredSelf) { 1429 // Exit the view group. 1430 if (action == MotionEvent.ACTION_HOVER_EXIT) { 1431 // Send the exit as is. 1432 handled |= super.dispatchHoverEvent(event); // exit 1433 } else { 1434 // Synthesize an exit from a move or enter. 1435 // Ignore the result because hover focus is moving to a different view. 1436 if (action == MotionEvent.ACTION_HOVER_MOVE) { 1437 super.dispatchHoverEvent(event); // move 1438 } 1439 eventNoHistory = obtainMotionEventNoHistoryOrSelf(eventNoHistory); 1440 eventNoHistory.setAction(MotionEvent.ACTION_HOVER_EXIT); 1441 super.dispatchHoverEvent(eventNoHistory); // exit 1442 eventNoHistory.setAction(action); 1443 } 1444 mHoveredSelf = false; 1445 } 1446 1447 if (newHoveredSelf) { 1448 // Enter the view group. 1449 if (action == MotionEvent.ACTION_HOVER_ENTER) { 1450 // Send the enter as is. 1451 handled |= super.dispatchHoverEvent(event); // enter 1452 mHoveredSelf = true; 1453 } else if (action == MotionEvent.ACTION_HOVER_MOVE) { 1454 // Synthesize an enter from a move. 1455 eventNoHistory = obtainMotionEventNoHistoryOrSelf(eventNoHistory); 1456 eventNoHistory.setAction(MotionEvent.ACTION_HOVER_ENTER); 1457 handled |= super.dispatchHoverEvent(eventNoHistory); // enter 1458 eventNoHistory.setAction(action); 1459 1460 handled |= super.dispatchHoverEvent(eventNoHistory); // move 1461 mHoveredSelf = true; 1462 } 1463 } 1464 } 1465 1466 // Recycle the copy of the event that we made. 1467 if (eventNoHistory != event) { 1468 eventNoHistory.recycle(); 1469 } 1470 1471 // Done. 1472 return handled; 1473 } 1474 1475 /** @hide */ 1476 @Override 1477 protected boolean hasHoveredChild() { 1478 return mFirstHoverTarget != null; 1479 } 1480 1481 /** 1482 * Implement this method to intercept hover events before they are handled 1483 * by child views. 1484 * <p> 1485 * This method is called before dispatching a hover event to a child of 1486 * the view group or to the view group's own {@link #onHoverEvent} to allow 1487 * the view group a chance to intercept the hover event. 1488 * This method can also be used to watch all pointer motions that occur within 1489 * the bounds of the view group even when the pointer is hovering over 1490 * a child of the view group rather than over the view group itself. 1491 * </p><p> 1492 * The view group can prevent its children from receiving hover events by 1493 * implementing this method and returning <code>true</code> to indicate 1494 * that it would like to intercept hover events. The view group must 1495 * continuously return <code>true</code> from {@link #onInterceptHoverEvent} 1496 * for as long as it wishes to continue intercepting hover events from 1497 * its children. 1498 * </p><p> 1499 * Interception preserves the invariant that at most one view can be 1500 * hovered at a time by transferring hover focus from the currently hovered 1501 * child to the view group or vice-versa as needed. 1502 * </p><p> 1503 * If this method returns <code>true</code> and a child is already hovered, then the 1504 * child view will first receive a hover exit event and then the view group 1505 * itself will receive a hover enter event in {@link #onHoverEvent}. 1506 * Likewise, if this method had previously returned <code>true</code> to intercept hover 1507 * events and instead returns <code>false</code> while the pointer is hovering 1508 * within the bounds of one of a child, then the view group will first receive a 1509 * hover exit event in {@link #onHoverEvent} and then the hovered child will 1510 * receive a hover enter event. 1511 * </p><p> 1512 * The default implementation always returns false. 1513 * </p> 1514 * 1515 * @param event The motion event that describes the hover. 1516 * @return True if the view group would like to intercept the hover event 1517 * and prevent its children from receiving it. 1518 */ 1519 public boolean onInterceptHoverEvent(MotionEvent event) { 1520 return false; 1521 } 1522 1523 private static MotionEvent obtainMotionEventNoHistoryOrSelf(MotionEvent event) { 1524 if (event.getHistorySize() == 0) { 1525 return event; 1526 } 1527 return MotionEvent.obtainNoHistory(event); 1528 } 1529 1530 /** 1531 * {@inheritDoc} 1532 */ 1533 @Override 1534 protected boolean dispatchGenericPointerEvent(MotionEvent event) { 1535 // Send the event to the child under the pointer. 1536 final int childrenCount = mChildrenCount; 1537 if (childrenCount != 0) { 1538 final View[] children = mChildren; 1539 final float x = event.getX(); 1540 final float y = event.getY(); 1541 1542 for (int i = childrenCount - 1; i >= 0; i--) { 1543 final View child = children[i]; 1544 if (!canViewReceivePointerEvents(child) 1545 || !isTransformedTouchPointInView(x, y, child, null)) { 1546 continue; 1547 } 1548 1549 if (dispatchTransformedGenericPointerEvent(event, child)) { 1550 return true; 1551 } 1552 } 1553 } 1554 1555 // No child handled the event. Send it to this view group. 1556 return super.dispatchGenericPointerEvent(event); 1557 } 1558 1559 /** 1560 * {@inheritDoc} 1561 */ 1562 @Override 1563 protected boolean dispatchGenericFocusedEvent(MotionEvent event) { 1564 // Send the event to the focused child or to this view group if it has focus. 1565 if ((mPrivateFlags & (FOCUSED | HAS_BOUNDS)) == (FOCUSED | HAS_BOUNDS)) { 1566 return super.dispatchGenericFocusedEvent(event); 1567 } else if (mFocused != null && (mFocused.mPrivateFlags & HAS_BOUNDS) == HAS_BOUNDS) { 1568 return mFocused.dispatchGenericMotionEvent(event); 1569 } 1570 return false; 1571 } 1572 1573 /** 1574 * Dispatches a generic pointer event to a child, taking into account 1575 * transformations that apply to the child. 1576 * 1577 * @param event The event to send. 1578 * @param child The view to send the event to. 1579 * @return {@code true} if the child handled the event. 1580 */ 1581 private boolean dispatchTransformedGenericPointerEvent(MotionEvent event, View child) { 1582 final float offsetX = mScrollX - child.mLeft; 1583 final float offsetY = mScrollY - child.mTop; 1584 1585 boolean handled; 1586 if (!child.hasIdentityMatrix()) { 1587 MotionEvent transformedEvent = MotionEvent.obtain(event); 1588 transformedEvent.offsetLocation(offsetX, offsetY); 1589 transformedEvent.transform(child.getInverseMatrix()); 1590 handled = child.dispatchGenericMotionEvent(transformedEvent); 1591 transformedEvent.recycle(); 1592 } else { 1593 event.offsetLocation(offsetX, offsetY); 1594 handled = child.dispatchGenericMotionEvent(event); 1595 event.offsetLocation(-offsetX, -offsetY); 1596 } 1597 return handled; 1598 } 1599 1600 /** 1601 * {@inheritDoc} 1602 */ 1603 @Override 1604 public boolean dispatchTouchEvent(MotionEvent ev) { 1605 if (mInputEventConsistencyVerifier != null) { 1606 mInputEventConsistencyVerifier.onTouchEvent(ev, 1); 1607 } 1608 1609 boolean handled = false; 1610 if (onFilterTouchEventForSecurity(ev)) { 1611 final int action = ev.getAction(); 1612 final int actionMasked = action & MotionEvent.ACTION_MASK; 1613 1614 // Handle an initial down. 1615 if (actionMasked == MotionEvent.ACTION_DOWN) { 1616 // Throw away all previous state when starting a new touch gesture. 1617 // The framework may have dropped the up or cancel event for the previous gesture 1618 // due to an app switch, ANR, or some other state change. 1619 cancelAndClearTouchTargets(ev); 1620 resetTouchState(); 1621 } 1622 1623 // Check for interception. 1624 final boolean intercepted; 1625 if (actionMasked == MotionEvent.ACTION_DOWN 1626 || mFirstTouchTarget != null) { 1627 final boolean disallowIntercept = (mGroupFlags & FLAG_DISALLOW_INTERCEPT) != 0; 1628 if (!disallowIntercept) { 1629 intercepted = onInterceptTouchEvent(ev); 1630 ev.setAction(action); // restore action in case it was changed 1631 } else { 1632 intercepted = false; 1633 } 1634 } else { 1635 // There are no touch targets and this action is not an initial down 1636 // so this view group continues to intercept touches. 1637 intercepted = true; 1638 } 1639 1640 // Check for cancelation. 1641 final boolean canceled = resetCancelNextUpFlag(this) 1642 || actionMasked == MotionEvent.ACTION_CANCEL; 1643 1644 // Update list of touch targets for pointer down, if needed. 1645 final boolean split = (mGroupFlags & FLAG_SPLIT_MOTION_EVENTS) != 0; 1646 TouchTarget newTouchTarget = null; 1647 boolean alreadyDispatchedToNewTouchTarget = false; 1648 if (!canceled && !intercepted) { 1649 if (actionMasked == MotionEvent.ACTION_DOWN 1650 || (split && actionMasked == MotionEvent.ACTION_POINTER_DOWN) 1651 || actionMasked == MotionEvent.ACTION_HOVER_MOVE) { 1652 final int actionIndex = ev.getActionIndex(); // always 0 for down 1653 final int idBitsToAssign = split ? 1 << ev.getPointerId(actionIndex) 1654 : TouchTarget.ALL_POINTER_IDS; 1655 1656 // Clean up earlier touch targets for this pointer id in case they 1657 // have become out of sync. 1658 removePointersFromTouchTargets(idBitsToAssign); 1659 1660 final int childrenCount = mChildrenCount; 1661 if (childrenCount != 0) { 1662 // Find a child that can receive the event. 1663 // Scan children from front to back. 1664 final View[] children = mChildren; 1665 final float x = ev.getX(actionIndex); 1666 final float y = ev.getY(actionIndex); 1667 1668 for (int i = childrenCount - 1; i >= 0; i--) { 1669 final View child = children[i]; 1670 if (!canViewReceivePointerEvents(child) 1671 || !isTransformedTouchPointInView(x, y, child, null)) { 1672 continue; 1673 } 1674 1675 newTouchTarget = getTouchTarget(child); 1676 if (newTouchTarget != null) { 1677 // Child is already receiving touch within its bounds. 1678 // Give it the new pointer in addition to the ones it is handling. 1679 newTouchTarget.pointerIdBits |= idBitsToAssign; 1680 break; 1681 } 1682 1683 resetCancelNextUpFlag(child); 1684 if (dispatchTransformedTouchEvent(ev, false, child, idBitsToAssign)) { 1685 // Child wants to receive touch within its bounds. 1686 mLastTouchDownTime = ev.getDownTime(); 1687 mLastTouchDownIndex = i; 1688 mLastTouchDownX = ev.getX(); 1689 mLastTouchDownY = ev.getY(); 1690 newTouchTarget = addTouchTarget(child, idBitsToAssign); 1691 alreadyDispatchedToNewTouchTarget = true; 1692 break; 1693 } 1694 } 1695 } 1696 1697 if (newTouchTarget == null && mFirstTouchTarget != null) { 1698 // Did not find a child to receive the event. 1699 // Assign the pointer to the least recently added target. 1700 newTouchTarget = mFirstTouchTarget; 1701 while (newTouchTarget.next != null) { 1702 newTouchTarget = newTouchTarget.next; 1703 } 1704 newTouchTarget.pointerIdBits |= idBitsToAssign; 1705 } 1706 } 1707 } 1708 1709 // Dispatch to touch targets. 1710 if (mFirstTouchTarget == null) { 1711 // No touch targets so treat this as an ordinary view. 1712 handled = dispatchTransformedTouchEvent(ev, canceled, null, 1713 TouchTarget.ALL_POINTER_IDS); 1714 } else { 1715 // Dispatch to touch targets, excluding the new touch target if we already 1716 // dispatched to it. Cancel touch targets if necessary. 1717 TouchTarget predecessor = null; 1718 TouchTarget target = mFirstTouchTarget; 1719 while (target != null) { 1720 final TouchTarget next = target.next; 1721 if (alreadyDispatchedToNewTouchTarget && target == newTouchTarget) { 1722 handled = true; 1723 } else { 1724 final boolean cancelChild = resetCancelNextUpFlag(target.child) 1725 || intercepted; 1726 if (dispatchTransformedTouchEvent(ev, cancelChild, 1727 target.child, target.pointerIdBits)) { 1728 handled = true; 1729 } 1730 if (cancelChild) { 1731 if (predecessor == null) { 1732 mFirstTouchTarget = next; 1733 } else { 1734 predecessor.next = next; 1735 } 1736 target.recycle(); 1737 target = next; 1738 continue; 1739 } 1740 } 1741 predecessor = target; 1742 target = next; 1743 } 1744 } 1745 1746 // Update list of touch targets for pointer up or cancel, if needed. 1747 if (canceled 1748 || actionMasked == MotionEvent.ACTION_UP 1749 || actionMasked == MotionEvent.ACTION_HOVER_MOVE) { 1750 resetTouchState(); 1751 } else if (split && actionMasked == MotionEvent.ACTION_POINTER_UP) { 1752 final int actionIndex = ev.getActionIndex(); 1753 final int idBitsToRemove = 1 << ev.getPointerId(actionIndex); 1754 removePointersFromTouchTargets(idBitsToRemove); 1755 } 1756 } 1757 1758 if (!handled && mInputEventConsistencyVerifier != null) { 1759 mInputEventConsistencyVerifier.onUnhandledEvent(ev, 1); 1760 } 1761 return handled; 1762 } 1763 1764 /** 1765 * Resets all touch state in preparation for a new cycle. 1766 */ 1767 private void resetTouchState() { 1768 clearTouchTargets(); 1769 resetCancelNextUpFlag(this); 1770 mGroupFlags &= ~FLAG_DISALLOW_INTERCEPT; 1771 } 1772 1773 /** 1774 * Resets the cancel next up flag. 1775 * Returns true if the flag was previously set. 1776 */ 1777 private boolean resetCancelNextUpFlag(View view) { 1778 if ((view.mPrivateFlags & CANCEL_NEXT_UP_EVENT) != 0) { 1779 view.mPrivateFlags &= ~CANCEL_NEXT_UP_EVENT; 1780 return true; 1781 } 1782 return false; 1783 } 1784 1785 /** 1786 * Clears all touch targets. 1787 */ 1788 private void clearTouchTargets() { 1789 TouchTarget target = mFirstTouchTarget; 1790 if (target != null) { 1791 do { 1792 TouchTarget next = target.next; 1793 target.recycle(); 1794 target = next; 1795 } while (target != null); 1796 mFirstTouchTarget = null; 1797 } 1798 } 1799 1800 /** 1801 * Cancels and clears all touch targets. 1802 */ 1803 private void cancelAndClearTouchTargets(MotionEvent event) { 1804 if (mFirstTouchTarget != null) { 1805 boolean syntheticEvent = false; 1806 if (event == null) { 1807 final long now = SystemClock.uptimeMillis(); 1808 event = MotionEvent.obtain(now, now, 1809 MotionEvent.ACTION_CANCEL, 0.0f, 0.0f, 0); 1810 event.setSource(InputDevice.SOURCE_TOUCHSCREEN); 1811 syntheticEvent = true; 1812 } 1813 1814 for (TouchTarget target = mFirstTouchTarget; target != null; target = target.next) { 1815 resetCancelNextUpFlag(target.child); 1816 dispatchTransformedTouchEvent(event, true, target.child, target.pointerIdBits); 1817 } 1818 clearTouchTargets(); 1819 1820 if (syntheticEvent) { 1821 event.recycle(); 1822 } 1823 } 1824 } 1825 1826 /** 1827 * Gets the touch target for specified child view. 1828 * Returns null if not found. 1829 */ 1830 private TouchTarget getTouchTarget(View child) { 1831 for (TouchTarget target = mFirstTouchTarget; target != null; target = target.next) { 1832 if (target.child == child) { 1833 return target; 1834 } 1835 } 1836 return null; 1837 } 1838 1839 /** 1840 * Adds a touch target for specified child to the beginning of the list. 1841 * Assumes the target child is not already present. 1842 */ 1843 private TouchTarget addTouchTarget(View child, int pointerIdBits) { 1844 TouchTarget target = TouchTarget.obtain(child, pointerIdBits); 1845 target.next = mFirstTouchTarget; 1846 mFirstTouchTarget = target; 1847 return target; 1848 } 1849 1850 /** 1851 * Removes the pointer ids from consideration. 1852 */ 1853 private void removePointersFromTouchTargets(int pointerIdBits) { 1854 TouchTarget predecessor = null; 1855 TouchTarget target = mFirstTouchTarget; 1856 while (target != null) { 1857 final TouchTarget next = target.next; 1858 if ((target.pointerIdBits & pointerIdBits) != 0) { 1859 target.pointerIdBits &= ~pointerIdBits; 1860 if (target.pointerIdBits == 0) { 1861 if (predecessor == null) { 1862 mFirstTouchTarget = next; 1863 } else { 1864 predecessor.next = next; 1865 } 1866 target.recycle(); 1867 target = next; 1868 continue; 1869 } 1870 } 1871 predecessor = target; 1872 target = next; 1873 } 1874 } 1875 1876 /** 1877 * Returns true if a child view can receive pointer events. 1878 * @hide 1879 */ 1880 private static boolean canViewReceivePointerEvents(View child) { 1881 return (child.mViewFlags & VISIBILITY_MASK) == VISIBLE 1882 || child.getAnimation() != null; 1883 } 1884 1885 /** 1886 * Returns true if a child view contains the specified point when transformed 1887 * into its coordinate space. 1888 * Child must not be null. 1889 * @hide 1890 */ 1891 protected boolean isTransformedTouchPointInView(float x, float y, View child, 1892 PointF outLocalPoint) { 1893 float localX = x + mScrollX - child.mLeft; 1894 float localY = y + mScrollY - child.mTop; 1895 if (! child.hasIdentityMatrix() && mAttachInfo != null) { 1896 final float[] localXY = mAttachInfo.mTmpTransformLocation; 1897 localXY[0] = localX; 1898 localXY[1] = localY; 1899 child.getInverseMatrix().mapPoints(localXY); 1900 localX = localXY[0]; 1901 localY = localXY[1]; 1902 } 1903 final boolean isInView = child.pointInView(localX, localY); 1904 if (isInView && outLocalPoint != null) { 1905 outLocalPoint.set(localX, localY); 1906 } 1907 return isInView; 1908 } 1909 1910 /** 1911 * Transforms a motion event into the coordinate space of a particular child view, 1912 * filters out irrelevant pointer ids, and overrides its action if necessary. 1913 * If child is null, assumes the MotionEvent will be sent to this ViewGroup instead. 1914 */ 1915 private boolean dispatchTransformedTouchEvent(MotionEvent event, boolean cancel, 1916 View child, int desiredPointerIdBits) { 1917 final boolean handled; 1918 1919 // Canceling motions is a special case. We don't need to perform any transformations 1920 // or filtering. The important part is the action, not the contents. 1921 final int oldAction = event.getAction(); 1922 if (cancel || oldAction == MotionEvent.ACTION_CANCEL) { 1923 event.setAction(MotionEvent.ACTION_CANCEL); 1924 if (child == null) { 1925 handled = super.dispatchTouchEvent(event); 1926 } else { 1927 handled = child.dispatchTouchEvent(event); 1928 } 1929 event.setAction(oldAction); 1930 return handled; 1931 } 1932 1933 // Calculate the number of pointers to deliver. 1934 final int oldPointerIdBits = event.getPointerIdBits(); 1935 final int newPointerIdBits = oldPointerIdBits & desiredPointerIdBits; 1936 1937 // If for some reason we ended up in an inconsistent state where it looks like we 1938 // might produce a motion event with no pointers in it, then drop the event. 1939 if (newPointerIdBits == 0) { 1940 return false; 1941 } 1942 1943 // If the number of pointers is the same and we don't need to perform any fancy 1944 // irreversible transformations, then we can reuse the motion event for this 1945 // dispatch as long as we are careful to revert any changes we make. 1946 // Otherwise we need to make a copy. 1947 final MotionEvent transformedEvent; 1948 if (newPointerIdBits == oldPointerIdBits) { 1949 if (child == null || child.hasIdentityMatrix()) { 1950 if (child == null) { 1951 handled = super.dispatchTouchEvent(event); 1952 } else { 1953 final float offsetX = mScrollX - child.mLeft; 1954 final float offsetY = mScrollY - child.mTop; 1955 event.offsetLocation(offsetX, offsetY); 1956 1957 handled = child.dispatchTouchEvent(event); 1958 1959 event.offsetLocation(-offsetX, -offsetY); 1960 } 1961 return handled; 1962 } 1963 transformedEvent = MotionEvent.obtain(event); 1964 } else { 1965 transformedEvent = event.split(newPointerIdBits); 1966 } 1967 1968 // Perform any necessary transformations and dispatch. 1969 if (child == null) { 1970 handled = super.dispatchTouchEvent(transformedEvent); 1971 } else { 1972 final float offsetX = mScrollX - child.mLeft; 1973 final float offsetY = mScrollY - child.mTop; 1974 transformedEvent.offsetLocation(offsetX, offsetY); 1975 if (! child.hasIdentityMatrix()) { 1976 transformedEvent.transform(child.getInverseMatrix()); 1977 } 1978 1979 handled = child.dispatchTouchEvent(transformedEvent); 1980 } 1981 1982 // Done. 1983 transformedEvent.recycle(); 1984 return handled; 1985 } 1986 1987 /** 1988 * Enable or disable the splitting of MotionEvents to multiple children during touch event 1989 * dispatch. This behavior is enabled by default for applications that target an 1990 * SDK version of {@link Build.VERSION_CODES#HONEYCOMB} or newer. 1991 * 1992 * <p>When this option is enabled MotionEvents may be split and dispatched to different child 1993 * views depending on where each pointer initially went down. This allows for user interactions 1994 * such as scrolling two panes of content independently, chording of buttons, and performing 1995 * independent gestures on different pieces of content. 1996 * 1997 * @param split <code>true</code> to allow MotionEvents to be split and dispatched to multiple 1998 * child views. <code>false</code> to only allow one child view to be the target of 1999 * any MotionEvent received by this ViewGroup. 2000 */ 2001 public void setMotionEventSplittingEnabled(boolean split) { 2002 // TODO Applications really shouldn't change this setting mid-touch event, 2003 // but perhaps this should handle that case and send ACTION_CANCELs to any child views 2004 // with gestures in progress when this is changed. 2005 if (split) { 2006 mGroupFlags |= FLAG_SPLIT_MOTION_EVENTS; 2007 } else { 2008 mGroupFlags &= ~FLAG_SPLIT_MOTION_EVENTS; 2009 } 2010 } 2011 2012 /** 2013 * Returns true if MotionEvents dispatched to this ViewGroup can be split to multiple children. 2014 * @return true if MotionEvents dispatched to this ViewGroup can be split to multiple children. 2015 */ 2016 public boolean isMotionEventSplittingEnabled() { 2017 return (mGroupFlags & FLAG_SPLIT_MOTION_EVENTS) == FLAG_SPLIT_MOTION_EVENTS; 2018 } 2019 2020 /** 2021 * {@inheritDoc} 2022 */ 2023 public void requestDisallowInterceptTouchEvent(boolean disallowIntercept) { 2024 2025 if (disallowIntercept == ((mGroupFlags & FLAG_DISALLOW_INTERCEPT) != 0)) { 2026 // We're already in this state, assume our ancestors are too 2027 return; 2028 } 2029 2030 if (disallowIntercept) { 2031 mGroupFlags |= FLAG_DISALLOW_INTERCEPT; 2032 } else { 2033 mGroupFlags &= ~FLAG_DISALLOW_INTERCEPT; 2034 } 2035 2036 // Pass it up to our parent 2037 if (mParent != null) { 2038 mParent.requestDisallowInterceptTouchEvent(disallowIntercept); 2039 } 2040 } 2041 2042 /** 2043 * Implement this method to intercept all touch screen motion events. This 2044 * allows you to watch events as they are dispatched to your children, and 2045 * take ownership of the current gesture at any point. 2046 * 2047 * <p>Using this function takes some care, as it has a fairly complicated 2048 * interaction with {@link View#onTouchEvent(MotionEvent) 2049 * View.onTouchEvent(MotionEvent)}, and using it requires implementing 2050 * that method as well as this one in the correct way. Events will be 2051 * received in the following order: 2052 * 2053 * <ol> 2054 * <li> You will receive the down event here. 2055 * <li> The down event will be handled either by a child of this view 2056 * group, or given to your own onTouchEvent() method to handle; this means 2057 * you should implement onTouchEvent() to return true, so you will 2058 * continue to see the rest of the gesture (instead of looking for 2059 * a parent view to handle it). Also, by returning true from 2060 * onTouchEvent(), you will not receive any following 2061 * events in onInterceptTouchEvent() and all touch processing must 2062 * happen in onTouchEvent() like normal. 2063 * <li> For as long as you return false from this function, each following 2064 * event (up to and including the final up) will be delivered first here 2065 * and then to the target's onTouchEvent(). 2066 * <li> If you return true from here, you will not receive any 2067 * following events: the target view will receive the same event but 2068 * with the action {@link MotionEvent#ACTION_CANCEL}, and all further 2069 * events will be delivered to your onTouchEvent() method and no longer 2070 * appear here. 2071 * </ol> 2072 * 2073 * @param ev The motion event being dispatched down the hierarchy. 2074 * @return Return true to steal motion events from the children and have 2075 * them dispatched to this ViewGroup through onTouchEvent(). 2076 * The current target will receive an ACTION_CANCEL event, and no further 2077 * messages will be delivered here. 2078 */ 2079 public boolean onInterceptTouchEvent(MotionEvent ev) { 2080 return false; 2081 } 2082 2083 /** 2084 * {@inheritDoc} 2085 * 2086 * Looks for a view to give focus to respecting the setting specified by 2087 * {@link #getDescendantFocusability()}. 2088 * 2089 * Uses {@link #onRequestFocusInDescendants(int, android.graphics.Rect)} to 2090 * find focus within the children of this group when appropriate. 2091 * 2092 * @see #FOCUS_BEFORE_DESCENDANTS 2093 * @see #FOCUS_AFTER_DESCENDANTS 2094 * @see #FOCUS_BLOCK_DESCENDANTS 2095 * @see #onRequestFocusInDescendants(int, android.graphics.Rect) 2096 */ 2097 @Override 2098 public boolean requestFocus(int direction, Rect previouslyFocusedRect) { 2099 if (DBG) { 2100 System.out.println(this + " ViewGroup.requestFocus direction=" 2101 + direction); 2102 } 2103 int descendantFocusability = getDescendantFocusability(); 2104 2105 switch (descendantFocusability) { 2106 case FOCUS_BLOCK_DESCENDANTS: 2107 return super.requestFocus(direction, previouslyFocusedRect); 2108 case FOCUS_BEFORE_DESCENDANTS: { 2109 final boolean took = super.requestFocus(direction, previouslyFocusedRect); 2110 return took ? took : onRequestFocusInDescendants(direction, previouslyFocusedRect); 2111 } 2112 case FOCUS_AFTER_DESCENDANTS: { 2113 final boolean took = onRequestFocusInDescendants(direction, previouslyFocusedRect); 2114 return took ? took : super.requestFocus(direction, previouslyFocusedRect); 2115 } 2116 default: 2117 throw new IllegalStateException("descendant focusability must be " 2118 + "one of FOCUS_BEFORE_DESCENDANTS, FOCUS_AFTER_DESCENDANTS, FOCUS_BLOCK_DESCENDANTS " 2119 + "but is " + descendantFocusability); 2120 } 2121 } 2122 2123 /** 2124 * Look for a descendant to call {@link View#requestFocus} on. 2125 * Called by {@link ViewGroup#requestFocus(int, android.graphics.Rect)} 2126 * when it wants to request focus within its children. Override this to 2127 * customize how your {@link ViewGroup} requests focus within its children. 2128 * @param direction One of FOCUS_UP, FOCUS_DOWN, FOCUS_LEFT, and FOCUS_RIGHT 2129 * @param previouslyFocusedRect The rectangle (in this View's coordinate system) 2130 * to give a finer grained hint about where focus is coming from. May be null 2131 * if there is no hint. 2132 * @return Whether focus was taken. 2133 */ 2134 @SuppressWarnings({"ConstantConditions"}) 2135 protected boolean onRequestFocusInDescendants(int direction, 2136 Rect previouslyFocusedRect) { 2137 int index; 2138 int increment; 2139 int end; 2140 int count = mChildrenCount; 2141 if ((direction & FOCUS_FORWARD) != 0) { 2142 index = 0; 2143 increment = 1; 2144 end = count; 2145 } else { 2146 index = count - 1; 2147 increment = -1; 2148 end = -1; 2149 } 2150 final View[] children = mChildren; 2151 for (int i = index; i != end; i += increment) { 2152 View child = children[i]; 2153 if ((child.mViewFlags & VISIBILITY_MASK) == VISIBLE) { 2154 if (child.requestFocus(direction, previouslyFocusedRect)) { 2155 return true; 2156 } 2157 } 2158 } 2159 return false; 2160 } 2161 2162 /** 2163 * {@inheritDoc} 2164 * 2165 * @hide 2166 */ 2167 @Override 2168 public void dispatchStartTemporaryDetach() { 2169 super.dispatchStartTemporaryDetach(); 2170 final int count = mChildrenCount; 2171 final View[] children = mChildren; 2172 for (int i = 0; i < count; i++) { 2173 children[i].dispatchStartTemporaryDetach(); 2174 } 2175 } 2176 2177 /** 2178 * {@inheritDoc} 2179 * 2180 * @hide 2181 */ 2182 @Override 2183 public void dispatchFinishTemporaryDetach() { 2184 super.dispatchFinishTemporaryDetach(); 2185 final int count = mChildrenCount; 2186 final View[] children = mChildren; 2187 for (int i = 0; i < count; i++) { 2188 children[i].dispatchFinishTemporaryDetach(); 2189 } 2190 } 2191 2192 /** 2193 * {@inheritDoc} 2194 */ 2195 @Override 2196 void dispatchAttachedToWindow(AttachInfo info, int visibility) { 2197 mGroupFlags |= FLAG_PREVENT_DISPATCH_ATTACHED_TO_WINDOW; 2198 super.dispatchAttachedToWindow(info, visibility); 2199 mGroupFlags &= ~FLAG_PREVENT_DISPATCH_ATTACHED_TO_WINDOW; 2200 2201 visibility |= mViewFlags & VISIBILITY_MASK; 2202 2203 final int count = mChildrenCount; 2204 final View[] children = mChildren; 2205 for (int i = 0; i < count; i++) { 2206 children[i].dispatchAttachedToWindow(info, visibility); 2207 } 2208 } 2209 2210 @Override 2211 boolean dispatchPopulateAccessibilityEventInternal(AccessibilityEvent event) { 2212 boolean handled = super.dispatchPopulateAccessibilityEventInternal(event); 2213 if (handled) { 2214 return handled; 2215 } 2216 // Let our children have a shot in populating the event. 2217 for (int i = 0, count = getChildCount(); i < count; i++) { 2218 View child = getChildAt(i); 2219 if ((child.mViewFlags & VISIBILITY_MASK) == VISIBLE) { 2220 handled = getChildAt(i).dispatchPopulateAccessibilityEvent(event); 2221 if (handled) { 2222 return handled; 2223 } 2224 } 2225 } 2226 return false; 2227 } 2228 2229 @Override 2230 void onInitializeAccessibilityNodeInfoInternal(AccessibilityNodeInfo info) { 2231 super.onInitializeAccessibilityNodeInfoInternal(info); 2232 // If the view is not the topmost one in the view hierarchy and it is 2233 // marked as the logical root of a view hierarchy, do not go any deeper. 2234 if ((!(getParent() instanceof ViewRootImpl)) && (mPrivateFlags & IS_ROOT_NAMESPACE) != 0) { 2235 return; 2236 } 2237 for (int i = 0, count = mChildrenCount; i < count; i++) { 2238 View child = mChildren[i]; 2239 if ((child.mViewFlags & VISIBILITY_MASK) == VISIBLE) { 2240 info.addChild(child); 2241 } 2242 } 2243 } 2244 2245 /** 2246 * {@inheritDoc} 2247 */ 2248 @Override 2249 void dispatchDetachedFromWindow() { 2250 // If we still have a touch target, we are still in the process of 2251 // dispatching motion events to a child; we need to get rid of that 2252 // child to avoid dispatching events to it after the window is torn 2253 // down. To make sure we keep the child in a consistent state, we 2254 // first send it an ACTION_CANCEL motion event. 2255 cancelAndClearTouchTargets(null); 2256 2257 // In case view is detached while transition is running 2258 mLayoutSuppressed = false; 2259 2260 // Tear down our drag tracking 2261 mDragNotifiedChildren = null; 2262 if (mCurrentDrag != null) { 2263 mCurrentDrag.recycle(); 2264 mCurrentDrag = null; 2265 } 2266 2267 final int count = mChildrenCount; 2268 final View[] children = mChildren; 2269 for (int i = 0; i < count; i++) { 2270 children[i].dispatchDetachedFromWindow(); 2271 } 2272 super.dispatchDetachedFromWindow(); 2273 } 2274 2275 /** 2276 * {@inheritDoc} 2277 */ 2278 @Override 2279 public void setPadding(int left, int top, int right, int bottom) { 2280 super.setPadding(left, top, right, bottom); 2281 2282 if ((mPaddingLeft | mPaddingTop | mPaddingRight | mPaddingBottom) != 0) { 2283 mGroupFlags |= FLAG_PADDING_NOT_NULL; 2284 } else { 2285 mGroupFlags &= ~FLAG_PADDING_NOT_NULL; 2286 } 2287 } 2288 2289 /** 2290 * {@inheritDoc} 2291 */ 2292 @Override 2293 protected void dispatchSaveInstanceState(SparseArray<Parcelable> container) { 2294 super.dispatchSaveInstanceState(container); 2295 final int count = mChildrenCount; 2296 final View[] children = mChildren; 2297 for (int i = 0; i < count; i++) { 2298 View c = children[i]; 2299 if ((c.mViewFlags & PARENT_SAVE_DISABLED_MASK) != PARENT_SAVE_DISABLED) { 2300 c.dispatchSaveInstanceState(container); 2301 } 2302 } 2303 } 2304 2305 /** 2306 * Perform dispatching of a {@link #saveHierarchyState(android.util.SparseArray)} freeze()} 2307 * to only this view, not to its children. For use when overriding 2308 * {@link #dispatchSaveInstanceState(android.util.SparseArray)} dispatchFreeze()} to allow 2309 * subclasses to freeze their own state but not the state of their children. 2310 * 2311 * @param container the container 2312 */ 2313 protected void dispatchFreezeSelfOnly(SparseArray<Parcelable> container) { 2314 super.dispatchSaveInstanceState(container); 2315 } 2316 2317 /** 2318 * {@inheritDoc} 2319 */ 2320 @Override 2321 protected void dispatchRestoreInstanceState(SparseArray<Parcelable> container) { 2322 super.dispatchRestoreInstanceState(container); 2323 final int count = mChildrenCount; 2324 final View[] children = mChildren; 2325 for (int i = 0; i < count; i++) { 2326 View c = children[i]; 2327 if ((c.mViewFlags & PARENT_SAVE_DISABLED_MASK) != PARENT_SAVE_DISABLED) { 2328 c.dispatchRestoreInstanceState(container); 2329 } 2330 } 2331 } 2332 2333 /** 2334 * Perform dispatching of a {@link #restoreHierarchyState(android.util.SparseArray)} 2335 * to only this view, not to its children. For use when overriding 2336 * {@link #dispatchRestoreInstanceState(android.util.SparseArray)} to allow 2337 * subclasses to thaw their own state but not the state of their children. 2338 * 2339 * @param container the container 2340 */ 2341 protected void dispatchThawSelfOnly(SparseArray<Parcelable> container) { 2342 super.dispatchRestoreInstanceState(container); 2343 } 2344 2345 /** 2346 * Enables or disables the drawing cache for each child of this view group. 2347 * 2348 * @param enabled true to enable the cache, false to dispose of it 2349 */ 2350 protected void setChildrenDrawingCacheEnabled(boolean enabled) { 2351 if (enabled || (mPersistentDrawingCache & PERSISTENT_ALL_CACHES) != PERSISTENT_ALL_CACHES) { 2352 final View[] children = mChildren; 2353 final int count = mChildrenCount; 2354 for (int i = 0; i < count; i++) { 2355 children[i].setDrawingCacheEnabled(enabled); 2356 } 2357 } 2358 } 2359 2360 @Override 2361 protected void onAnimationStart() { 2362 super.onAnimationStart(); 2363 2364 // When this ViewGroup's animation starts, build the cache for the children 2365 if ((mGroupFlags & FLAG_ANIMATION_CACHE) == FLAG_ANIMATION_CACHE) { 2366 final int count = mChildrenCount; 2367 final View[] children = mChildren; 2368 final boolean buildCache = !isHardwareAccelerated(); 2369 2370 for (int i = 0; i < count; i++) { 2371 final View child = children[i]; 2372 if ((child.mViewFlags & VISIBILITY_MASK) == VISIBLE) { 2373 child.setDrawingCacheEnabled(true); 2374 if (buildCache) { 2375 child.buildDrawingCache(true); 2376 } 2377 } 2378 } 2379 2380 mGroupFlags |= FLAG_CHILDREN_DRAWN_WITH_CACHE; 2381 } 2382 } 2383 2384 @Override 2385 protected void onAnimationEnd() { 2386 super.onAnimationEnd(); 2387 2388 // When this ViewGroup's animation ends, destroy the cache of the children 2389 if ((mGroupFlags & FLAG_ANIMATION_CACHE) == FLAG_ANIMATION_CACHE) { 2390 mGroupFlags &= ~FLAG_CHILDREN_DRAWN_WITH_CACHE; 2391 2392 if ((mPersistentDrawingCache & PERSISTENT_ANIMATION_CACHE) == 0) { 2393 setChildrenDrawingCacheEnabled(false); 2394 } 2395 } 2396 } 2397 2398 @Override 2399 Bitmap createSnapshot(Bitmap.Config quality, int backgroundColor, boolean skipChildren) { 2400 int count = mChildrenCount; 2401 int[] visibilities = null; 2402 2403 if (skipChildren) { 2404 visibilities = new int[count]; 2405 for (int i = 0; i < count; i++) { 2406 View child = getChildAt(i); 2407 visibilities[i] = child.getVisibility(); 2408 if (visibilities[i] == View.VISIBLE) { 2409 child.setVisibility(INVISIBLE); 2410 } 2411 } 2412 } 2413 2414 Bitmap b = super.createSnapshot(quality, backgroundColor, skipChildren); 2415 2416 if (skipChildren) { 2417 for (int i = 0; i < count; i++) { 2418 getChildAt(i).setVisibility(visibilities[i]); 2419 } 2420 } 2421 2422 return b; 2423 } 2424 2425 /** 2426 * {@inheritDoc} 2427 */ 2428 @Override 2429 protected void dispatchDraw(Canvas canvas) { 2430 final int count = mChildrenCount; 2431 final View[] children = mChildren; 2432 int flags = mGroupFlags; 2433 2434 if ((flags & FLAG_RUN_ANIMATION) != 0 && canAnimate()) { 2435 final boolean cache = (mGroupFlags & FLAG_ANIMATION_CACHE) == FLAG_ANIMATION_CACHE; 2436 2437 final boolean buildCache = !isHardwareAccelerated(); 2438 for (int i = 0; i < count; i++) { 2439 final View child = children[i]; 2440 if ((child.mViewFlags & VISIBILITY_MASK) == VISIBLE) { 2441 final LayoutParams params = child.getLayoutParams(); 2442 attachLayoutAnimationParameters(child, params, i, count); 2443 bindLayoutAnimation(child); 2444 if (cache) { 2445 child.setDrawingCacheEnabled(true); 2446 if (buildCache) { 2447 child.buildDrawingCache(true); 2448 } 2449 } 2450 } 2451 } 2452 2453 final LayoutAnimationController controller = mLayoutAnimationController; 2454 if (controller.willOverlap()) { 2455 mGroupFlags |= FLAG_OPTIMIZE_INVALIDATE; 2456 } 2457 2458 controller.start(); 2459 2460 mGroupFlags &= ~FLAG_RUN_ANIMATION; 2461 mGroupFlags &= ~FLAG_ANIMATION_DONE; 2462 2463 if (cache) { 2464 mGroupFlags |= FLAG_CHILDREN_DRAWN_WITH_CACHE; 2465 } 2466 2467 if (mAnimationListener != null) { 2468 mAnimationListener.onAnimationStart(controller.getAnimation()); 2469 } 2470 } 2471 2472 int saveCount = 0; 2473 final boolean clipToPadding = (flags & CLIP_TO_PADDING_MASK) == CLIP_TO_PADDING_MASK; 2474 if (clipToPadding) { 2475 saveCount = canvas.save(); 2476 canvas.clipRect(mScrollX + mPaddingLeft, mScrollY + mPaddingTop, 2477 mScrollX + mRight - mLeft - mPaddingRight, 2478 mScrollY + mBottom - mTop - mPaddingBottom); 2479 2480 } 2481 2482 // We will draw our child's animation, let's reset the flag 2483 mPrivateFlags &= ~DRAW_ANIMATION; 2484 mGroupFlags &= ~FLAG_INVALIDATE_REQUIRED; 2485 2486 boolean more = false; 2487 final long drawingTime = getDrawingTime(); 2488 2489 if ((flags & FLAG_USE_CHILD_DRAWING_ORDER) == 0) { 2490 for (int i = 0; i < count; i++) { 2491 final View child = children[i]; 2492 if ((child.mViewFlags & VISIBILITY_MASK) == VISIBLE || child.getAnimation() != null) { 2493 more |= drawChild(canvas, child, drawingTime); 2494 } 2495 } 2496 } else { 2497 for (int i = 0; i < count; i++) { 2498 final View child = children[getChildDrawingOrder(count, i)]; 2499 if ((child.mViewFlags & VISIBILITY_MASK) == VISIBLE || child.getAnimation() != null) { 2500 more |= drawChild(canvas, child, drawingTime); 2501 } 2502 } 2503 } 2504 2505 // Draw any disappearing views that have animations 2506 if (mDisappearingChildren != null) { 2507 final ArrayList<View> disappearingChildren = mDisappearingChildren; 2508 final int disappearingCount = disappearingChildren.size() - 1; 2509 // Go backwards -- we may delete as animations finish 2510 for (int i = disappearingCount; i >= 0; i--) { 2511 final View child = disappearingChildren.get(i); 2512 more |= drawChild(canvas, child, drawingTime); 2513 } 2514 } 2515 2516 if (clipToPadding) { 2517 canvas.restoreToCount(saveCount); 2518 } 2519 2520 // mGroupFlags might have been updated by drawChild() 2521 flags = mGroupFlags; 2522 2523 if ((flags & FLAG_INVALIDATE_REQUIRED) == FLAG_INVALIDATE_REQUIRED) { 2524 invalidate(true); 2525 } 2526 2527 if ((flags & FLAG_ANIMATION_DONE) == 0 && (flags & FLAG_NOTIFY_ANIMATION_LISTENER) == 0 && 2528 mLayoutAnimationController.isDone() && !more) { 2529 // We want to erase the drawing cache and notify the listener after the 2530 // next frame is drawn because one extra invalidate() is caused by 2531 // drawChild() after the animation is over 2532 mGroupFlags |= FLAG_NOTIFY_ANIMATION_LISTENER; 2533 final Runnable end = new Runnable() { 2534 public void run() { 2535 notifyAnimationListener(); 2536 } 2537 }; 2538 post(end); 2539 } 2540 } 2541 2542 /** 2543 * Returns the index of the child to draw for this iteration. Override this 2544 * if you want to change the drawing order of children. By default, it 2545 * returns i. 2546 * <p> 2547 * NOTE: In order for this method to be called, you must enable child ordering 2548 * first by calling {@link #setChildrenDrawingOrderEnabled(boolean)}. 2549 * 2550 * @param i The current iteration. 2551 * @return The index of the child to draw this iteration. 2552 * 2553 * @see #setChildrenDrawingOrderEnabled(boolean) 2554 * @see #isChildrenDrawingOrderEnabled() 2555 */ 2556 protected int getChildDrawingOrder(int childCount, int i) { 2557 return i; 2558 } 2559 2560 private void notifyAnimationListener() { 2561 mGroupFlags &= ~FLAG_NOTIFY_ANIMATION_LISTENER; 2562 mGroupFlags |= FLAG_ANIMATION_DONE; 2563 2564 if (mAnimationListener != null) { 2565 final Runnable end = new Runnable() { 2566 public void run() { 2567 mAnimationListener.onAnimationEnd(mLayoutAnimationController.getAnimation()); 2568 } 2569 }; 2570 post(end); 2571 } 2572 2573 if ((mGroupFlags & FLAG_ANIMATION_CACHE) == FLAG_ANIMATION_CACHE) { 2574 mGroupFlags &= ~FLAG_CHILDREN_DRAWN_WITH_CACHE; 2575 if ((mPersistentDrawingCache & PERSISTENT_ANIMATION_CACHE) == 0) { 2576 setChildrenDrawingCacheEnabled(false); 2577 } 2578 } 2579 2580 invalidate(true); 2581 } 2582 2583 /** 2584 * This method is used to cause children of this ViewGroup to restore or recreate their 2585 * display lists. It is called by getDisplayList() when the parent ViewGroup does not need 2586 * to recreate its own display list, which would happen if it went through the normal 2587 * draw/dispatchDraw mechanisms. 2588 * 2589 * @hide 2590 */ 2591 @Override 2592 protected void dispatchGetDisplayList() { 2593 final int count = mChildrenCount; 2594 final View[] children = mChildren; 2595 for (int i = 0; i < count; i++) { 2596 final View child = children[i]; 2597 if (((child.mViewFlags & VISIBILITY_MASK) == VISIBLE || child.getAnimation() != null) && 2598 child.hasStaticLayer()) { 2599 child.mRecreateDisplayList = (child.mPrivateFlags & INVALIDATED) == INVALIDATED; 2600 child.mPrivateFlags &= ~INVALIDATED; 2601 child.getDisplayList(); 2602 child.mRecreateDisplayList = false; 2603 } 2604 } 2605 } 2606 2607 /** 2608 * Draw one child of this View Group. This method is responsible for getting 2609 * the canvas in the right state. This includes clipping, translating so 2610 * that the child's scrolled origin is at 0, 0, and applying any animation 2611 * transformations. 2612 * 2613 * @param canvas The canvas on which to draw the child 2614 * @param child Who to draw 2615 * @param drawingTime The time at which draw is occuring 2616 * @return True if an invalidate() was issued 2617 */ 2618 protected boolean drawChild(Canvas canvas, View child, long drawingTime) { 2619 boolean more = false; 2620 2621 final int cl = child.mLeft; 2622 final int ct = child.mTop; 2623 final int cr = child.mRight; 2624 final int cb = child.mBottom; 2625 2626 final boolean childHasIdentityMatrix = child.hasIdentityMatrix(); 2627 2628 final int flags = mGroupFlags; 2629 2630 if ((flags & FLAG_CLEAR_TRANSFORMATION) == FLAG_CLEAR_TRANSFORMATION) { 2631 mChildTransformation.clear(); 2632 mGroupFlags &= ~FLAG_CLEAR_TRANSFORMATION; 2633 } 2634 2635 Transformation transformToApply = null; 2636 Transformation invalidationTransform; 2637 final Animation a = child.getAnimation(); 2638 boolean concatMatrix = false; 2639 2640 boolean scalingRequired = false; 2641 boolean caching; 2642 int layerType = mDrawLayers ? child.getLayerType() : LAYER_TYPE_NONE; 2643 2644 final boolean hardwareAccelerated = canvas.isHardwareAccelerated(); 2645 if ((flags & FLAG_CHILDREN_DRAWN_WITH_CACHE) == FLAG_CHILDREN_DRAWN_WITH_CACHE || 2646 (flags & FLAG_ALWAYS_DRAWN_WITH_CACHE) == FLAG_ALWAYS_DRAWN_WITH_CACHE) { 2647 caching = true; 2648 if (mAttachInfo != null) scalingRequired = mAttachInfo.mScalingRequired; 2649 } else { 2650 caching = (layerType != LAYER_TYPE_NONE) || hardwareAccelerated; 2651 } 2652 2653 if (a != null) { 2654 final boolean initialized = a.isInitialized(); 2655 if (!initialized) { 2656 a.initialize(cr - cl, cb - ct, getWidth(), getHeight()); 2657 a.initializeInvalidateRegion(0, 0, cr - cl, cb - ct); 2658 child.onAnimationStart(); 2659 } 2660 2661 more = a.getTransformation(drawingTime, mChildTransformation, 2662 scalingRequired ? mAttachInfo.mApplicationScale : 1f); 2663 if (scalingRequired && mAttachInfo.mApplicationScale != 1f) { 2664 if (mInvalidationTransformation == null) { 2665 mInvalidationTransformation = new Transformation(); 2666 } 2667 invalidationTransform = mInvalidationTransformation; 2668 a.getTransformation(drawingTime, invalidationTransform, 1f); 2669 } else { 2670 invalidationTransform = mChildTransformation; 2671 } 2672 transformToApply = mChildTransformation; 2673 2674 concatMatrix = a.willChangeTransformationMatrix(); 2675 2676 if (more) { 2677 if (!a.willChangeBounds()) { 2678 if ((flags & (FLAG_OPTIMIZE_INVALIDATE | FLAG_ANIMATION_DONE)) == 2679 FLAG_OPTIMIZE_INVALIDATE) { 2680 mGroupFlags |= FLAG_INVALIDATE_REQUIRED; 2681 } else if ((flags & FLAG_INVALIDATE_REQUIRED) == 0) { 2682 // The child need to draw an animation, potentially offscreen, so 2683 // make sure we do not cancel invalidate requests 2684 mPrivateFlags |= DRAW_ANIMATION; 2685 invalidate(cl, ct, cr, cb); 2686 } 2687 } else { 2688 if (mInvalidateRegion == null) { 2689 mInvalidateRegion = new RectF(); 2690 } 2691 final RectF region = mInvalidateRegion; 2692 a.getInvalidateRegion(0, 0, cr - cl, cb - ct, region, invalidationTransform); 2693 2694 // The child need to draw an animation, potentially offscreen, so 2695 // make sure we do not cancel invalidate requests 2696 mPrivateFlags |= DRAW_ANIMATION; 2697 2698 final int left = cl + (int) region.left; 2699 final int top = ct + (int) region.top; 2700 invalidate(left, top, left + (int) (region.width() + .5f), 2701 top + (int) (region.height() + .5f)); 2702 } 2703 } 2704 } else if ((flags & FLAG_SUPPORT_STATIC_TRANSFORMATIONS) == 2705 FLAG_SUPPORT_STATIC_TRANSFORMATIONS) { 2706 final boolean hasTransform = getChildStaticTransformation(child, mChildTransformation); 2707 if (hasTransform) { 2708 final int transformType = mChildTransformation.getTransformationType(); 2709 transformToApply = transformType != Transformation.TYPE_IDENTITY ? 2710 mChildTransformation : null; 2711 concatMatrix = (transformType & Transformation.TYPE_MATRIX) != 0; 2712 } 2713 } 2714 2715 concatMatrix |= !childHasIdentityMatrix; 2716 2717 // Sets the flag as early as possible to allow draw() implementations 2718 // to call invalidate() successfully when doing animations 2719 child.mPrivateFlags |= DRAWN; 2720 2721 if (!concatMatrix && canvas.quickReject(cl, ct, cr, cb, Canvas.EdgeType.BW) && 2722 (child.mPrivateFlags & DRAW_ANIMATION) == 0) { 2723 return more; 2724 } 2725 2726 float alpha = child.getAlpha(); 2727 // Bail out early if the view does not need to be drawn 2728 if (alpha <= ViewConfiguration.ALPHA_THRESHOLD && (child.mPrivateFlags & ALPHA_SET) == 0 && 2729 !(child instanceof SurfaceView)) { 2730 return more; 2731 } 2732 2733 if (hardwareAccelerated) { 2734 // Clear INVALIDATED flag to allow invalidation to occur during rendering, but 2735 // retain the flag's value temporarily in the mRecreateDisplayList flag 2736 child.mRecreateDisplayList = (child.mPrivateFlags & INVALIDATED) == INVALIDATED; 2737 child.mPrivateFlags &= ~INVALIDATED; 2738 } 2739 2740 child.computeScroll(); 2741 2742 final int sx = child.mScrollX; 2743 final int sy = child.mScrollY; 2744 2745 DisplayList displayList = null; 2746 Bitmap cache = null; 2747 boolean hasDisplayList = false; 2748 if (caching) { 2749 if (!hardwareAccelerated) { 2750 if (layerType != LAYER_TYPE_NONE) { 2751 layerType = LAYER_TYPE_SOFTWARE; 2752 child.buildDrawingCache(true); 2753 } 2754 cache = child.getDrawingCache(true); 2755 } else { 2756 switch (layerType) { 2757 case LAYER_TYPE_SOFTWARE: 2758 child.buildDrawingCache(true); 2759 cache = child.getDrawingCache(true); 2760 break; 2761 case LAYER_TYPE_NONE: 2762 // Delay getting the display list until animation-driven alpha values are 2763 // set up and possibly passed on to the view 2764 hasDisplayList = child.canHaveDisplayList(); 2765 break; 2766 } 2767 } 2768 } 2769 2770 final boolean hasNoCache = cache == null || hasDisplayList; 2771 final boolean offsetForScroll = cache == null && !hasDisplayList && 2772 layerType != LAYER_TYPE_HARDWARE; 2773 2774 final int restoreTo = canvas.save(); 2775 if (offsetForScroll) { 2776 canvas.translate(cl - sx, ct - sy); 2777 } else { 2778 canvas.translate(cl, ct); 2779 if (scalingRequired) { 2780 // mAttachInfo cannot be null, otherwise scalingRequired == false 2781 final float scale = 1.0f / mAttachInfo.mApplicationScale; 2782 canvas.scale(scale, scale); 2783 } 2784 } 2785 2786 if (transformToApply != null || alpha < 1.0f || !child.hasIdentityMatrix()) { 2787 if (transformToApply != null || !childHasIdentityMatrix) { 2788 int transX = 0; 2789 int transY = 0; 2790 2791 if (offsetForScroll) { 2792 transX = -sx; 2793 transY = -sy; 2794 } 2795 2796 if (transformToApply != null) { 2797 if (concatMatrix) { 2798 // Undo the scroll translation, apply the transformation matrix, 2799 // then redo the scroll translate to get the correct result. 2800 canvas.translate(-transX, -transY); 2801 canvas.concat(transformToApply.getMatrix()); 2802 canvas.translate(transX, transY); 2803 mGroupFlags |= FLAG_CLEAR_TRANSFORMATION; 2804 } 2805 2806 float transformAlpha = transformToApply.getAlpha(); 2807 if (transformAlpha < 1.0f) { 2808 alpha *= transformToApply.getAlpha(); 2809 mGroupFlags |= FLAG_CLEAR_TRANSFORMATION; 2810 } 2811 } 2812 2813 if (!childHasIdentityMatrix) { 2814 canvas.translate(-transX, -transY); 2815 canvas.concat(child.getMatrix()); 2816 canvas.translate(transX, transY); 2817 } 2818 } 2819 2820 if (alpha < 1.0f) { 2821 mGroupFlags |= FLAG_CLEAR_TRANSFORMATION; 2822 if (hasNoCache) { 2823 final int multipliedAlpha = (int) (255 * alpha); 2824 if (!child.onSetAlpha(multipliedAlpha)) { 2825 int layerFlags = Canvas.HAS_ALPHA_LAYER_SAVE_FLAG; 2826 if ((flags & FLAG_CLIP_CHILDREN) == FLAG_CLIP_CHILDREN || 2827 layerType != LAYER_TYPE_NONE) { 2828 layerFlags |= Canvas.CLIP_TO_LAYER_SAVE_FLAG; 2829 } 2830 if (layerType == LAYER_TYPE_NONE) { 2831 final int scrollX = hasDisplayList ? 0 : sx; 2832 final int scrollY = hasDisplayList ? 0 : sy; 2833 canvas.saveLayerAlpha(scrollX, scrollY, scrollX + cr - cl, 2834 scrollY + cb - ct, multipliedAlpha, layerFlags); 2835 } 2836 } else { 2837 // Alpha is handled by the child directly, clobber the layer's alpha 2838 child.mPrivateFlags |= ALPHA_SET; 2839 } 2840 } 2841 } 2842 } else if ((child.mPrivateFlags & ALPHA_SET) == ALPHA_SET) { 2843 child.onSetAlpha(255); 2844 child.mPrivateFlags &= ~ALPHA_SET; 2845 } 2846 2847 if ((flags & FLAG_CLIP_CHILDREN) == FLAG_CLIP_CHILDREN) { 2848 if (offsetForScroll) { 2849 canvas.clipRect(sx, sy, sx + (cr - cl), sy + (cb - ct)); 2850 } else { 2851 if (!scalingRequired || cache == null) { 2852 canvas.clipRect(0, 0, cr - cl, cb - ct); 2853 } else { 2854 canvas.clipRect(0, 0, cache.getWidth(), cache.getHeight()); 2855 } 2856 } 2857 } 2858 2859 if (hasDisplayList) { 2860 displayList = child.getDisplayList(); 2861 if (!displayList.isValid()) { 2862 // Uncommon, but possible. If a view is removed from the hierarchy during the call 2863 // to getDisplayList(), the display list will be marked invalid and we should not 2864 // try to use it again. 2865 displayList = null; 2866 hasDisplayList = false; 2867 } 2868 } 2869 2870 if (hasNoCache) { 2871 boolean layerRendered = false; 2872 if (layerType == LAYER_TYPE_HARDWARE) { 2873 final HardwareLayer layer = child.getHardwareLayer(); 2874 if (layer != null && layer.isValid()) { 2875 child.mLayerPaint.setAlpha((int) (alpha * 255)); 2876 ((HardwareCanvas) canvas).drawHardwareLayer(layer, 0, 0, child.mLayerPaint); 2877 layerRendered = true; 2878 } else { 2879 final int scrollX = hasDisplayList ? 0 : sx; 2880 final int scrollY = hasDisplayList ? 0 : sy; 2881 canvas.saveLayer(scrollX, scrollY, 2882 scrollX + cr - cl, scrollY + cb - ct, child.mLayerPaint, 2883 Canvas.HAS_ALPHA_LAYER_SAVE_FLAG | Canvas.CLIP_TO_LAYER_SAVE_FLAG); 2884 } 2885 } 2886 2887 if (!layerRendered) { 2888 if (!hasDisplayList) { 2889 // Fast path for layouts with no backgrounds 2890 if ((child.mPrivateFlags & SKIP_DRAW) == SKIP_DRAW) { 2891 if (ViewDebug.TRACE_HIERARCHY) { 2892 ViewDebug.trace(this, ViewDebug.HierarchyTraceType.DRAW); 2893 } 2894 child.mPrivateFlags &= ~DIRTY_MASK; 2895 child.dispatchDraw(canvas); 2896 } else { 2897 child.draw(canvas); 2898 } 2899 } else { 2900 child.mPrivateFlags &= ~DIRTY_MASK; 2901 ((HardwareCanvas) canvas).drawDisplayList(displayList, cr - cl, cb - ct, null); 2902 } 2903 } 2904 } else if (cache != null) { 2905 child.mPrivateFlags &= ~DIRTY_MASK; 2906 Paint cachePaint; 2907 2908 if (layerType == LAYER_TYPE_NONE) { 2909 cachePaint = mCachePaint; 2910 if (cachePaint == null) { 2911 cachePaint = new Paint(); 2912 cachePaint.setDither(false); 2913 mCachePaint = cachePaint; 2914 } 2915 if (alpha < 1.0f) { 2916 cachePaint.setAlpha((int) (alpha * 255)); 2917 mGroupFlags |= FLAG_ALPHA_LOWER_THAN_ONE; 2918 } else if ((flags & FLAG_ALPHA_LOWER_THAN_ONE) == FLAG_ALPHA_LOWER_THAN_ONE) { 2919 cachePaint.setAlpha(255); 2920 mGroupFlags &= ~FLAG_ALPHA_LOWER_THAN_ONE; 2921 } 2922 } else { 2923 cachePaint = child.mLayerPaint; 2924 cachePaint.setAlpha((int) (alpha * 255)); 2925 } 2926 canvas.drawBitmap(cache, 0.0f, 0.0f, cachePaint); 2927 } 2928 2929 canvas.restoreToCount(restoreTo); 2930 2931 if (a != null && !more) { 2932 if (!hardwareAccelerated && !a.getFillAfter()) { 2933 child.onSetAlpha(255); 2934 } 2935 finishAnimatingView(child, a); 2936 } 2937 2938 if (more && hardwareAccelerated) { 2939 // invalidation is the trigger to recreate display lists, so if we're using 2940 // display lists to render, force an invalidate to allow the animation to 2941 // continue drawing another frame 2942 invalidate(true); 2943 if (a.hasAlpha() && (child.mPrivateFlags & ALPHA_SET) == ALPHA_SET) { 2944 // alpha animations should cause the child to recreate its display list 2945 child.invalidate(true); 2946 } 2947 } 2948 2949 child.mRecreateDisplayList = false; 2950 2951 return more; 2952 } 2953 2954 /** 2955 * 2956 * @param enabled True if children should be drawn with layers, false otherwise. 2957 * 2958 * @hide 2959 */ 2960 public void setChildrenLayersEnabled(boolean enabled) { 2961 if (enabled != mDrawLayers) { 2962 mDrawLayers = enabled; 2963 invalidate(true); 2964 2965 // We need to invalidate any child with a layer. For instance, 2966 // if a child is backed by a hardware layer and we disable layers 2967 // the child is marked as not dirty (flags cleared the last time 2968 // the child was drawn inside its layer.) However, that child might 2969 // never have created its own display list or have an obsolete 2970 // display list. By invalidating the child we ensure the display 2971 // list is in sync with the content of the hardware layer. 2972 for (int i = 0; i < mChildrenCount; i++) { 2973 View child = mChildren[i]; 2974 if (child.mLayerType != LAYER_TYPE_NONE) { 2975 child.invalidate(true); 2976 } 2977 } 2978 } 2979 } 2980 2981 /** 2982 * By default, children are clipped to their bounds before drawing. This 2983 * allows view groups to override this behavior for animations, etc. 2984 * 2985 * @param clipChildren true to clip children to their bounds, 2986 * false otherwise 2987 * @attr ref android.R.styleable#ViewGroup_clipChildren 2988 */ 2989 public void setClipChildren(boolean clipChildren) { 2990 setBooleanFlag(FLAG_CLIP_CHILDREN, clipChildren); 2991 } 2992 2993 /** 2994 * By default, children are clipped to the padding of the ViewGroup. This 2995 * allows view groups to override this behavior 2996 * 2997 * @param clipToPadding true to clip children to the padding of the 2998 * group, false otherwise 2999 * @attr ref android.R.styleable#ViewGroup_clipToPadding 3000 */ 3001 public void setClipToPadding(boolean clipToPadding) { 3002 setBooleanFlag(FLAG_CLIP_TO_PADDING, clipToPadding); 3003 } 3004 3005 /** 3006 * {@inheritDoc} 3007 */ 3008 @Override 3009 public void dispatchSetSelected(boolean selected) { 3010 final View[] children = mChildren; 3011 final int count = mChildrenCount; 3012 for (int i = 0; i < count; i++) { 3013 children[i].setSelected(selected); 3014 } 3015 } 3016 3017 /** 3018 * {@inheritDoc} 3019 */ 3020 @Override 3021 public void dispatchSetActivated(boolean activated) { 3022 final View[] children = mChildren; 3023 final int count = mChildrenCount; 3024 for (int i = 0; i < count; i++) { 3025 children[i].setActivated(activated); 3026 } 3027 } 3028 3029 @Override 3030 protected void dispatchSetPressed(boolean pressed) { 3031 final View[] children = mChildren; 3032 final int count = mChildrenCount; 3033 for (int i = 0; i < count; i++) { 3034 children[i].setPressed(pressed); 3035 } 3036 } 3037 3038 /** 3039 * When this property is set to true, this ViewGroup supports static transformations on 3040 * children; this causes 3041 * {@link #getChildStaticTransformation(View, android.view.animation.Transformation)} to be 3042 * invoked when a child is drawn. 3043 * 3044 * Any subclass overriding 3045 * {@link #getChildStaticTransformation(View, android.view.animation.Transformation)} should 3046 * set this property to true. 3047 * 3048 * @param enabled True to enable static transformations on children, false otherwise. 3049 * 3050 * @see #FLAG_SUPPORT_STATIC_TRANSFORMATIONS 3051 */ 3052 protected void setStaticTransformationsEnabled(boolean enabled) { 3053 setBooleanFlag(FLAG_SUPPORT_STATIC_TRANSFORMATIONS, enabled); 3054 } 3055 3056 /** 3057 * {@inheritDoc} 3058 * 3059 * @see #setStaticTransformationsEnabled(boolean) 3060 */ 3061 protected boolean getChildStaticTransformation(View child, Transformation t) { 3062 return false; 3063 } 3064 3065 /** 3066 * {@hide} 3067 */ 3068 @Override 3069 protected View findViewTraversal(int id) { 3070 if (id == mID) { 3071 return this; 3072 } 3073 3074 final View[] where = mChildren; 3075 final int len = mChildrenCount; 3076 3077 for (int i = 0; i < len; i++) { 3078 View v = where[i]; 3079 3080 if ((v.mPrivateFlags & IS_ROOT_NAMESPACE) == 0) { 3081 v = v.findViewById(id); 3082 3083 if (v != null) { 3084 return v; 3085 } 3086 } 3087 } 3088 3089 return null; 3090 } 3091 3092 /** 3093 * {@hide} 3094 */ 3095 @Override 3096 protected View findViewWithTagTraversal(Object tag) { 3097 if (tag != null && tag.equals(mTag)) { 3098 return this; 3099 } 3100 3101 final View[] where = mChildren; 3102 final int len = mChildrenCount; 3103 3104 for (int i = 0; i < len; i++) { 3105 View v = where[i]; 3106 3107 if ((v.mPrivateFlags & IS_ROOT_NAMESPACE) == 0) { 3108 v = v.findViewWithTag(tag); 3109 3110 if (v != null) { 3111 return v; 3112 } 3113 } 3114 } 3115 3116 return null; 3117 } 3118 3119 /** 3120 * {@hide} 3121 */ 3122 @Override 3123 protected View findViewByPredicateTraversal(Predicate<View> predicate, View childToSkip) { 3124 if (predicate.apply(this)) { 3125 return this; 3126 } 3127 3128 final View[] where = mChildren; 3129 final int len = mChildrenCount; 3130 3131 for (int i = 0; i < len; i++) { 3132 View v = where[i]; 3133 3134 if (v != childToSkip && (v.mPrivateFlags & IS_ROOT_NAMESPACE) == 0) { 3135 v = v.findViewByPredicate(predicate); 3136 3137 if (v != null) { 3138 return v; 3139 } 3140 } 3141 } 3142 3143 return null; 3144 } 3145 3146 /** 3147 * Adds a child view. If no layout parameters are already set on the child, the 3148 * default parameters for this ViewGroup are set on the child. 3149 * 3150 * @param child the child view to add 3151 * 3152 * @see #generateDefaultLayoutParams() 3153 */ 3154 public void addView(View child) { 3155 addView(child, -1); 3156 } 3157 3158 /** 3159 * Adds a child view. If no layout parameters are already set on the child, the 3160 * default parameters for this ViewGroup are set on the child. 3161 * 3162 * @param child the child view to add 3163 * @param index the position at which to add the child 3164 * 3165 * @see #generateDefaultLayoutParams() 3166 */ 3167 public void addView(View child, int index) { 3168 LayoutParams params = child.getLayoutParams(); 3169 if (params == null) { 3170 params = generateDefaultLayoutParams(); 3171 if (params == null) { 3172 throw new IllegalArgumentException("generateDefaultLayoutParams() cannot return null"); 3173 } 3174 } 3175 addView(child, index, params); 3176 } 3177 3178 /** 3179 * Adds a child view with this ViewGroup's default layout parameters and the 3180 * specified width and height. 3181 * 3182 * @param child the child view to add 3183 */ 3184 public void addView(View child, int width, int height) { 3185 final LayoutParams params = generateDefaultLayoutParams(); 3186 params.width = width; 3187 params.height = height; 3188 addView(child, -1, params); 3189 } 3190 3191 /** 3192 * Adds a child view with the specified layout parameters. 3193 * 3194 * @param child the child view to add 3195 * @param params the layout parameters to set on the child 3196 */ 3197 public void addView(View child, LayoutParams params) { 3198 addView(child, -1, params); 3199 } 3200 3201 /** 3202 * Adds a child view with the specified layout parameters. 3203 * 3204 * @param child the child view to add 3205 * @param index the position at which to add the child 3206 * @param params the layout parameters to set on the child 3207 */ 3208 public void addView(View child, int index, LayoutParams params) { 3209 if (DBG) { 3210 System.out.println(this + " addView"); 3211 } 3212 3213 // addViewInner() will call child.requestLayout() when setting the new LayoutParams 3214 // therefore, we call requestLayout() on ourselves before, so that the child's request 3215 // will be blocked at our level 3216 requestLayout(); 3217 invalidate(true); 3218 addViewInner(child, index, params, false); 3219 } 3220 3221 /** 3222 * {@inheritDoc} 3223 */ 3224 public void updateViewLayout(View view, ViewGroup.LayoutParams params) { 3225 if (!checkLayoutParams(params)) { 3226 throw new IllegalArgumentException("Invalid LayoutParams supplied to " + this); 3227 } 3228 if (view.mParent != this) { 3229 throw new IllegalArgumentException("Given view not a child of " + this); 3230 } 3231 view.setLayoutParams(params); 3232 } 3233 3234 /** 3235 * {@inheritDoc} 3236 */ 3237 protected boolean checkLayoutParams(ViewGroup.LayoutParams p) { 3238 return p != null; 3239 } 3240 3241 /** 3242 * Interface definition for a callback to be invoked when the hierarchy 3243 * within this view changed. The hierarchy changes whenever a child is added 3244 * to or removed from this view. 3245 */ 3246 public interface OnHierarchyChangeListener { 3247 /** 3248 * Called when a new child is added to a parent view. 3249 * 3250 * @param parent the view in which a child was added 3251 * @param child the new child view added in the hierarchy 3252 */ 3253 void onChildViewAdded(View parent, View child); 3254 3255 /** 3256 * Called when a child is removed from a parent view. 3257 * 3258 * @param parent the view from which the child was removed 3259 * @param child the child removed from the hierarchy 3260 */ 3261 void onChildViewRemoved(View parent, View child); 3262 } 3263 3264 /** 3265 * Register a callback to be invoked when a child is added to or removed 3266 * from this view. 3267 * 3268 * @param listener the callback to invoke on hierarchy change 3269 */ 3270 public void setOnHierarchyChangeListener(OnHierarchyChangeListener listener) { 3271 mOnHierarchyChangeListener = listener; 3272 } 3273 3274 /** 3275 * @hide 3276 */ 3277 protected void onViewAdded(View child) { 3278 if (mOnHierarchyChangeListener != null) { 3279 mOnHierarchyChangeListener.onChildViewAdded(this, child); 3280 } 3281 } 3282 3283 /** 3284 * @hide 3285 */ 3286 protected void onViewRemoved(View child) { 3287 if (mOnHierarchyChangeListener != null) { 3288 mOnHierarchyChangeListener.onChildViewRemoved(this, child); 3289 } 3290 } 3291 3292 /** 3293 * Adds a view during layout. This is useful if in your onLayout() method, 3294 * you need to add more views (as does the list view for example). 3295 * 3296 * If index is negative, it means put it at the end of the list. 3297 * 3298 * @param child the view to add to the group 3299 * @param index the index at which the child must be added 3300 * @param params the layout parameters to associate with the child 3301 * @return true if the child was added, false otherwise 3302 */ 3303 protected boolean addViewInLayout(View child, int index, LayoutParams params) { 3304 return addViewInLayout(child, index, params, false); 3305 } 3306 3307 /** 3308 * Adds a view during layout. This is useful if in your onLayout() method, 3309 * you need to add more views (as does the list view for example). 3310 * 3311 * If index is negative, it means put it at the end of the list. 3312 * 3313 * @param child the view to add to the group 3314 * @param index the index at which the child must be added 3315 * @param params the layout parameters to associate with the child 3316 * @param preventRequestLayout if true, calling this method will not trigger a 3317 * layout request on child 3318 * @return true if the child was added, false otherwise 3319 */ 3320 protected boolean addViewInLayout(View child, int index, LayoutParams params, 3321 boolean preventRequestLayout) { 3322 child.mParent = null; 3323 addViewInner(child, index, params, preventRequestLayout); 3324 child.mPrivateFlags = (child.mPrivateFlags & ~DIRTY_MASK) | DRAWN; 3325 return true; 3326 } 3327 3328 /** 3329 * Prevents the specified child to be laid out during the next layout pass. 3330 * 3331 * @param child the child on which to perform the cleanup 3332 */ 3333 protected void cleanupLayoutState(View child) { 3334 child.mPrivateFlags &= ~View.FORCE_LAYOUT; 3335 } 3336 3337 private void addViewInner(View child, int index, LayoutParams params, 3338 boolean preventRequestLayout) { 3339 3340 if (mTransition != null) { 3341 // Don't prevent other add transitions from completing, but cancel remove 3342 // transitions to let them complete the process before we add to the container 3343 mTransition.cancel(LayoutTransition.DISAPPEARING); 3344 } 3345 3346 if (child.getParent() != null) { 3347 throw new IllegalStateException("The specified child already has a parent. " + 3348 "You must call removeView() on the child's parent first."); 3349 } 3350 3351 if (mTransition != null) { 3352 mTransition.addChild(this, child); 3353 } 3354 3355 if (!checkLayoutParams(params)) { 3356 params = generateLayoutParams(params); 3357 } 3358 3359 if (preventRequestLayout) { 3360 child.mLayoutParams = params; 3361 } else { 3362 child.setLayoutParams(params); 3363 } 3364 3365 if (index < 0) { 3366 index = mChildrenCount; 3367 } 3368 3369 addInArray(child, index); 3370 3371 // tell our children 3372 if (preventRequestLayout) { 3373 child.assignParent(this); 3374 } else { 3375 child.mParent = this; 3376 } 3377 3378 if (child.hasFocus()) { 3379 requestChildFocus(child, child.findFocus()); 3380 } 3381 3382 AttachInfo ai = mAttachInfo; 3383 if (ai != null && (mGroupFlags & FLAG_PREVENT_DISPATCH_ATTACHED_TO_WINDOW) == 0) { 3384 boolean lastKeepOn = ai.mKeepScreenOn; 3385 ai.mKeepScreenOn = false; 3386 child.dispatchAttachedToWindow(mAttachInfo, (mViewFlags&VISIBILITY_MASK)); 3387 if (ai.mKeepScreenOn) { 3388 needGlobalAttributesUpdate(true); 3389 } 3390 ai.mKeepScreenOn = lastKeepOn; 3391 } 3392 3393 onViewAdded(child); 3394 3395 if ((child.mViewFlags & DUPLICATE_PARENT_STATE) == DUPLICATE_PARENT_STATE) { 3396 mGroupFlags |= FLAG_NOTIFY_CHILDREN_ON_DRAWABLE_STATE_CHANGE; 3397 } 3398 } 3399 3400 private void addInArray(View child, int index) { 3401 View[] children = mChildren; 3402 final int count = mChildrenCount; 3403 final int size = children.length; 3404 if (index == count) { 3405 if (size == count) { 3406 mChildren = new View[size + ARRAY_CAPACITY_INCREMENT]; 3407 System.arraycopy(children, 0, mChildren, 0, size); 3408 children = mChildren; 3409 } 3410 children[mChildrenCount++] = child; 3411 } else if (index < count) { 3412 if (size == count) { 3413 mChildren = new View[size + ARRAY_CAPACITY_INCREMENT]; 3414 System.arraycopy(children, 0, mChildren, 0, index); 3415 System.arraycopy(children, index, mChildren, index + 1, count - index); 3416 children = mChildren; 3417 } else { 3418 System.arraycopy(children, index, children, index + 1, count - index); 3419 } 3420 children[index] = child; 3421 mChildrenCount++; 3422 if (mLastTouchDownIndex >= index) { 3423 mLastTouchDownIndex++; 3424 } 3425 } else { 3426 throw new IndexOutOfBoundsException("index=" + index + " count=" + count); 3427 } 3428 } 3429 3430 // This method also sets the child's mParent to null 3431 private void removeFromArray(int index) { 3432 final View[] children = mChildren; 3433 if (!(mTransitioningViews != null && mTransitioningViews.contains(children[index]))) { 3434 children[index].mParent = null; 3435 } 3436 final int count = mChildrenCount; 3437 if (index == count - 1) { 3438 children[--mChildrenCount] = null; 3439 } else if (index >= 0 && index < count) { 3440 System.arraycopy(children, index + 1, children, index, count - index - 1); 3441 children[--mChildrenCount] = null; 3442 } else { 3443 throw new IndexOutOfBoundsException(); 3444 } 3445 if (mLastTouchDownIndex == index) { 3446 mLastTouchDownTime = 0; 3447 mLastTouchDownIndex = -1; 3448 } else if (mLastTouchDownIndex > index) { 3449 mLastTouchDownIndex--; 3450 } 3451 } 3452 3453 // This method also sets the children's mParent to null 3454 private void removeFromArray(int start, int count) { 3455 final View[] children = mChildren; 3456 final int childrenCount = mChildrenCount; 3457 3458 start = Math.max(0, start); 3459 final int end = Math.min(childrenCount, start + count); 3460 3461 if (start == end) { 3462 return; 3463 } 3464 3465 if (end == childrenCount) { 3466 for (int i = start; i < end; i++) { 3467 children[i].mParent = null; 3468 children[i] = null; 3469 } 3470 } else { 3471 for (int i = start; i < end; i++) { 3472 children[i].mParent = null; 3473 } 3474 3475 // Since we're looping above, we might as well do the copy, but is arraycopy() 3476 // faster than the extra 2 bounds checks we would do in the loop? 3477 System.arraycopy(children, end, children, start, childrenCount - end); 3478 3479 for (int i = childrenCount - (end - start); i < childrenCount; i++) { 3480 children[i] = null; 3481 } 3482 } 3483 3484 mChildrenCount -= (end - start); 3485 } 3486 3487 private void bindLayoutAnimation(View child) { 3488 Animation a = mLayoutAnimationController.getAnimationForView(child); 3489 child.setAnimation(a); 3490 } 3491 3492 /** 3493 * Subclasses should override this method to set layout animation 3494 * parameters on the supplied child. 3495 * 3496 * @param child the child to associate with animation parameters 3497 * @param params the child's layout parameters which hold the animation 3498 * parameters 3499 * @param index the index of the child in the view group 3500 * @param count the number of children in the view group 3501 */ 3502 protected void attachLayoutAnimationParameters(View child, 3503 LayoutParams params, int index, int count) { 3504 LayoutAnimationController.AnimationParameters animationParams = 3505 params.layoutAnimationParameters; 3506 if (animationParams == null) { 3507 animationParams = new LayoutAnimationController.AnimationParameters(); 3508 params.layoutAnimationParameters = animationParams; 3509 } 3510 3511 animationParams.count = count; 3512 animationParams.index = index; 3513 } 3514 3515 /** 3516 * {@inheritDoc} 3517 */ 3518 public void removeView(View view) { 3519 removeViewInternal(view); 3520 requestLayout(); 3521 invalidate(true); 3522 } 3523 3524 /** 3525 * Removes a view during layout. This is useful if in your onLayout() method, 3526 * you need to remove more views. 3527 * 3528 * @param view the view to remove from the group 3529 */ 3530 public void removeViewInLayout(View view) { 3531 removeViewInternal(view); 3532 } 3533 3534 /** 3535 * Removes a range of views during layout. This is useful if in your onLayout() method, 3536 * you need to remove more views. 3537 * 3538 * @param start the index of the first view to remove from the group 3539 * @param count the number of views to remove from the group 3540 */ 3541 public void removeViewsInLayout(int start, int count) { 3542 removeViewsInternal(start, count); 3543 } 3544 3545 /** 3546 * Removes the view at the specified position in the group. 3547 * 3548 * @param index the position in the group of the view to remove 3549 */ 3550 public void removeViewAt(int index) { 3551 removeViewInternal(index, getChildAt(index)); 3552 requestLayout(); 3553 invalidate(true); 3554 } 3555 3556 /** 3557 * Removes the specified range of views from the group. 3558 * 3559 * @param start the first position in the group of the range of views to remove 3560 * @param count the number of views to remove 3561 */ 3562 public void removeViews(int start, int count) { 3563 removeViewsInternal(start, count); 3564 requestLayout(); 3565 invalidate(true); 3566 } 3567 3568 private void removeViewInternal(View view) { 3569 final int index = indexOfChild(view); 3570 if (index >= 0) { 3571 removeViewInternal(index, view); 3572 } 3573 } 3574 3575 private void removeViewInternal(int index, View view) { 3576 3577 if (mTransition != null) { 3578 mTransition.removeChild(this, view); 3579 } 3580 3581 boolean clearChildFocus = false; 3582 if (view == mFocused) { 3583 view.clearFocusForRemoval(); 3584 clearChildFocus = true; 3585 } 3586 3587 if (view.getAnimation() != null || 3588 (mTransitioningViews != null && mTransitioningViews.contains(view))) { 3589 addDisappearingView(view); 3590 } else if (view.mAttachInfo != null) { 3591 view.dispatchDetachedFromWindow(); 3592 } 3593 3594 onViewRemoved(view); 3595 3596 needGlobalAttributesUpdate(false); 3597 3598 removeFromArray(index); 3599 3600 if (clearChildFocus) { 3601 clearChildFocus(view); 3602 } 3603 } 3604 3605 /** 3606 * Sets the LayoutTransition object for this ViewGroup. If the LayoutTransition object is 3607 * not null, changes in layout which occur because of children being added to or removed from 3608 * the ViewGroup will be animated according to the animations defined in that LayoutTransition 3609 * object. By default, the transition object is null (so layout changes are not animated). 3610 * 3611 * @param transition The LayoutTransition object that will animated changes in layout. A value 3612 * of <code>null</code> means no transition will run on layout changes. 3613 * @attr ref android.R.styleable#ViewGroup_animateLayoutChanges 3614 */ 3615 public void setLayoutTransition(LayoutTransition transition) { 3616 if (mTransition != null) { 3617 mTransition.removeTransitionListener(mLayoutTransitionListener); 3618 } 3619 mTransition = transition; 3620 if (mTransition != null) { 3621 mTransition.addTransitionListener(mLayoutTransitionListener); 3622 } 3623 } 3624 3625 /** 3626 * Gets the LayoutTransition object for this ViewGroup. If the LayoutTransition object is 3627 * not null, changes in layout which occur because of children being added to or removed from 3628 * the ViewGroup will be animated according to the animations defined in that LayoutTransition 3629 * object. By default, the transition object is null (so layout changes are not animated). 3630 * 3631 * @return LayoutTranstion The LayoutTransition object that will animated changes in layout. 3632 * A value of <code>null</code> means no transition will run on layout changes. 3633 */ 3634 public LayoutTransition getLayoutTransition() { 3635 return mTransition; 3636 } 3637 3638 private void removeViewsInternal(int start, int count) { 3639 final View focused = mFocused; 3640 final boolean detach = mAttachInfo != null; 3641 View clearChildFocus = null; 3642 3643 final View[] children = mChildren; 3644 final int end = start + count; 3645 3646 for (int i = start; i < end; i++) { 3647 final View view = children[i]; 3648 3649 if (mTransition != null) { 3650 mTransition.removeChild(this, view); 3651 } 3652 3653 if (view == focused) { 3654 view.clearFocusForRemoval(); 3655 clearChildFocus = view; 3656 } 3657 3658 if (view.getAnimation() != null || 3659 (mTransitioningViews != null && mTransitioningViews.contains(view))) { 3660 addDisappearingView(view); 3661 } else if (detach) { 3662 view.dispatchDetachedFromWindow(); 3663 } 3664 3665 needGlobalAttributesUpdate(false); 3666 3667 onViewRemoved(view); 3668 } 3669 3670 removeFromArray(start, count); 3671 3672 if (clearChildFocus != null) { 3673 clearChildFocus(clearChildFocus); 3674 } 3675 } 3676 3677 /** 3678 * Call this method to remove all child views from the 3679 * ViewGroup. 3680 */ 3681 public void removeAllViews() { 3682 removeAllViewsInLayout(); 3683 requestLayout(); 3684 invalidate(true); 3685 } 3686 3687 /** 3688 * Called by a ViewGroup subclass to remove child views from itself, 3689 * when it must first know its size on screen before it can calculate how many 3690 * child views it will render. An example is a Gallery or a ListView, which 3691 * may "have" 50 children, but actually only render the number of children 3692 * that can currently fit inside the object on screen. Do not call 3693 * this method unless you are extending ViewGroup and understand the 3694 * view measuring and layout pipeline. 3695 */ 3696 public void removeAllViewsInLayout() { 3697 final int count = mChildrenCount; 3698 if (count <= 0) { 3699 return; 3700 } 3701 3702 final View[] children = mChildren; 3703 mChildrenCount = 0; 3704 3705 final View focused = mFocused; 3706 final boolean detach = mAttachInfo != null; 3707 View clearChildFocus = null; 3708 3709 needGlobalAttributesUpdate(false); 3710 3711 for (int i = count - 1; i >= 0; i--) { 3712 final View view = children[i]; 3713 3714 if (mTransition != null) { 3715 mTransition.removeChild(this, view); 3716 } 3717 3718 if (view == focused) { 3719 view.clearFocusForRemoval(); 3720 clearChildFocus = view; 3721 } 3722 3723 if (view.getAnimation() != null || 3724 (mTransitioningViews != null && mTransitioningViews.contains(view))) { 3725 addDisappearingView(view); 3726 } else if (detach) { 3727 view.dispatchDetachedFromWindow(); 3728 } 3729 3730 onViewRemoved(view); 3731 3732 view.mParent = null; 3733 children[i] = null; 3734 } 3735 3736 if (clearChildFocus != null) { 3737 clearChildFocus(clearChildFocus); 3738 } 3739 } 3740 3741 /** 3742 * Finishes the removal of a detached view. This method will dispatch the detached from 3743 * window event and notify the hierarchy change listener. 3744 * 3745 * @param child the child to be definitely removed from the view hierarchy 3746 * @param animate if true and the view has an animation, the view is placed in the 3747 * disappearing views list, otherwise, it is detached from the window 3748 * 3749 * @see #attachViewToParent(View, int, android.view.ViewGroup.LayoutParams) 3750 * @see #detachAllViewsFromParent() 3751 * @see #detachViewFromParent(View) 3752 * @see #detachViewFromParent(int) 3753 */ 3754 protected void removeDetachedView(View child, boolean animate) { 3755 if (mTransition != null) { 3756 mTransition.removeChild(this, child); 3757 } 3758 3759 if (child == mFocused) { 3760 child.clearFocus(); 3761 } 3762 3763 if ((animate && child.getAnimation() != null) || 3764 (mTransitioningViews != null && mTransitioningViews.contains(child))) { 3765 addDisappearingView(child); 3766 } else if (child.mAttachInfo != null) { 3767 child.dispatchDetachedFromWindow(); 3768 } 3769 3770 onViewRemoved(child); 3771 } 3772 3773 /** 3774 * Attaches a view to this view group. Attaching a view assigns this group as the parent, 3775 * sets the layout parameters and puts the view in the list of children so it can be retrieved 3776 * by calling {@link #getChildAt(int)}. 3777 * 3778 * This method should be called only for view which were detached from their parent. 3779 * 3780 * @param child the child to attach 3781 * @param index the index at which the child should be attached 3782 * @param params the layout parameters of the child 3783 * 3784 * @see #removeDetachedView(View, boolean) 3785 * @see #detachAllViewsFromParent() 3786 * @see #detachViewFromParent(View) 3787 * @see #detachViewFromParent(int) 3788 */ 3789 protected void attachViewToParent(View child, int index, LayoutParams params) { 3790 child.mLayoutParams = params; 3791 3792 if (index < 0) { 3793 index = mChildrenCount; 3794 } 3795 3796 addInArray(child, index); 3797 3798 child.mParent = this; 3799 child.mPrivateFlags = (child.mPrivateFlags & ~DIRTY_MASK & ~DRAWING_CACHE_VALID) | 3800 DRAWN | INVALIDATED; 3801 this.mPrivateFlags |= INVALIDATED; 3802 3803 if (child.hasFocus()) { 3804 requestChildFocus(child, child.findFocus()); 3805 } 3806 } 3807 3808 /** 3809 * Detaches a view from its parent. Detaching a view should be temporary and followed 3810 * either by a call to {@link #attachViewToParent(View, int, android.view.ViewGroup.LayoutParams)} 3811 * or a call to {@link #removeDetachedView(View, boolean)}. When a view is detached, 3812 * its parent is null and cannot be retrieved by a call to {@link #getChildAt(int)}. 3813 * 3814 * @param child the child to detach 3815 * 3816 * @see #detachViewFromParent(int) 3817 * @see #detachViewsFromParent(int, int) 3818 * @see #detachAllViewsFromParent() 3819 * @see #attachViewToParent(View, int, android.view.ViewGroup.LayoutParams) 3820 * @see #removeDetachedView(View, boolean) 3821 */ 3822 protected void detachViewFromParent(View child) { 3823 removeFromArray(indexOfChild(child)); 3824 } 3825 3826 /** 3827 * Detaches a view from its parent. Detaching a view should be temporary and followed 3828 * either by a call to {@link #attachViewToParent(View, int, android.view.ViewGroup.LayoutParams)} 3829 * or a call to {@link #removeDetachedView(View, boolean)}. When a view is detached, 3830 * its parent is null and cannot be retrieved by a call to {@link #getChildAt(int)}. 3831 * 3832 * @param index the index of the child to detach 3833 * 3834 * @see #detachViewFromParent(View) 3835 * @see #detachAllViewsFromParent() 3836 * @see #detachViewsFromParent(int, int) 3837 * @see #attachViewToParent(View, int, android.view.ViewGroup.LayoutParams) 3838 * @see #removeDetachedView(View, boolean) 3839 */ 3840 protected void detachViewFromParent(int index) { 3841 removeFromArray(index); 3842 } 3843 3844 /** 3845 * Detaches a range of view from their parent. Detaching a view should be temporary and followed 3846 * either by a call to {@link #attachViewToParent(View, int, android.view.ViewGroup.LayoutParams)} 3847 * or a call to {@link #removeDetachedView(View, boolean)}. When a view is detached, its 3848 * parent is null and cannot be retrieved by a call to {@link #getChildAt(int)}. 3849 * 3850 * @param start the first index of the childrend range to detach 3851 * @param count the number of children to detach 3852 * 3853 * @see #detachViewFromParent(View) 3854 * @see #detachViewFromParent(int) 3855 * @see #detachAllViewsFromParent() 3856 * @see #attachViewToParent(View, int, android.view.ViewGroup.LayoutParams) 3857 * @see #removeDetachedView(View, boolean) 3858 */ 3859 protected void detachViewsFromParent(int start, int count) { 3860 removeFromArray(start, count); 3861 } 3862 3863 /** 3864 * Detaches all views from the parent. Detaching a view should be temporary and followed 3865 * either by a call to {@link #attachViewToParent(View, int, android.view.ViewGroup.LayoutParams)} 3866 * or a call to {@link #removeDetachedView(View, boolean)}. When a view is detached, 3867 * its parent is null and cannot be retrieved by a call to {@link #getChildAt(int)}. 3868 * 3869 * @see #detachViewFromParent(View) 3870 * @see #detachViewFromParent(int) 3871 * @see #detachViewsFromParent(int, int) 3872 * @see #attachViewToParent(View, int, android.view.ViewGroup.LayoutParams) 3873 * @see #removeDetachedView(View, boolean) 3874 */ 3875 protected void detachAllViewsFromParent() { 3876 final int count = mChildrenCount; 3877 if (count <= 0) { 3878 return; 3879 } 3880 3881 final View[] children = mChildren; 3882 mChildrenCount = 0; 3883 3884 for (int i = count - 1; i >= 0; i--) { 3885 children[i].mParent = null; 3886 children[i] = null; 3887 } 3888 } 3889 3890 /** 3891 * Don't call or override this method. It is used for the implementation of 3892 * the view hierarchy. 3893 */ 3894 public final void invalidateChild(View child, final Rect dirty) { 3895 if (ViewDebug.TRACE_HIERARCHY) { 3896 ViewDebug.trace(this, ViewDebug.HierarchyTraceType.INVALIDATE_CHILD); 3897 } 3898 3899 ViewParent parent = this; 3900 3901 final AttachInfo attachInfo = mAttachInfo; 3902 if (attachInfo != null) { 3903 // If the child is drawing an animation, we want to copy this flag onto 3904 // ourselves and the parent to make sure the invalidate request goes 3905 // through 3906 final boolean drawAnimation = (child.mPrivateFlags & DRAW_ANIMATION) == DRAW_ANIMATION; 3907 3908 if (dirty == null) { 3909 if (child.mLayerType != LAYER_TYPE_NONE) { 3910 mPrivateFlags |= INVALIDATED; 3911 mPrivateFlags &= ~DRAWING_CACHE_VALID; 3912 child.mLocalDirtyRect.setEmpty(); 3913 } 3914 do { 3915 View view = null; 3916 if (parent instanceof View) { 3917 view = (View) parent; 3918 if (view.mLayerType != LAYER_TYPE_NONE) { 3919 view.mLocalDirtyRect.setEmpty(); 3920 if (view.getParent() instanceof View) { 3921 final View grandParent = (View) view.getParent(); 3922 grandParent.mPrivateFlags |= INVALIDATED; 3923 grandParent.mPrivateFlags &= ~DRAWING_CACHE_VALID; 3924 } 3925 } 3926 if ((view.mPrivateFlags & DIRTY_MASK) != 0) { 3927 // already marked dirty - we're done 3928 break; 3929 } 3930 } 3931 3932 if (drawAnimation) { 3933 if (view != null) { 3934 view.mPrivateFlags |= DRAW_ANIMATION; 3935 } else if (parent instanceof ViewRootImpl) { 3936 ((ViewRootImpl) parent).mIsAnimating = true; 3937 } 3938 } 3939 3940 if (parent instanceof ViewRootImpl) { 3941 ((ViewRootImpl) parent).invalidate(); 3942 parent = null; 3943 } else if (view != null) { 3944 if ((view.mPrivateFlags & DRAWN) == DRAWN || 3945 (view.mPrivateFlags & DRAWING_CACHE_VALID) == DRAWING_CACHE_VALID) { 3946 view.mPrivateFlags &= ~DRAWING_CACHE_VALID; 3947 view.mPrivateFlags |= DIRTY; 3948 parent = view.mParent; 3949 } else { 3950 parent = null; 3951 } 3952 } 3953 } while (parent != null); 3954 } else { 3955 // Check whether the child that requests the invalidate is fully opaque 3956 final boolean isOpaque = child.isOpaque() && !drawAnimation && 3957 child.getAnimation() == null; 3958 // Mark the child as dirty, using the appropriate flag 3959 // Make sure we do not set both flags at the same time 3960 int opaqueFlag = isOpaque ? DIRTY_OPAQUE : DIRTY; 3961 3962 if (child.mLayerType != LAYER_TYPE_NONE) { 3963 mPrivateFlags |= INVALIDATED; 3964 mPrivateFlags &= ~DRAWING_CACHE_VALID; 3965 child.mLocalDirtyRect.union(dirty); 3966 } 3967 3968 final int[] location = attachInfo.mInvalidateChildLocation; 3969 location[CHILD_LEFT_INDEX] = child.mLeft; 3970 location[CHILD_TOP_INDEX] = child.mTop; 3971 Matrix childMatrix = child.getMatrix(); 3972 if (!childMatrix.isIdentity()) { 3973 RectF boundingRect = attachInfo.mTmpTransformRect; 3974 boundingRect.set(dirty); 3975 //boundingRect.inset(-0.5f, -0.5f); 3976 childMatrix.mapRect(boundingRect); 3977 dirty.set((int) (boundingRect.left - 0.5f), 3978 (int) (boundingRect.top - 0.5f), 3979 (int) (boundingRect.right + 0.5f), 3980 (int) (boundingRect.bottom + 0.5f)); 3981 } 3982 3983 do { 3984 View view = null; 3985 if (parent instanceof View) { 3986 view = (View) parent; 3987 if (view.mLayerType != LAYER_TYPE_NONE && 3988 view.getParent() instanceof View) { 3989 final View grandParent = (View) view.getParent(); 3990 grandParent.mPrivateFlags |= INVALIDATED; 3991 grandParent.mPrivateFlags &= ~DRAWING_CACHE_VALID; 3992 } 3993 } 3994 3995 if (drawAnimation) { 3996 if (view != null) { 3997 view.mPrivateFlags |= DRAW_ANIMATION; 3998 } else if (parent instanceof ViewRootImpl) { 3999 ((ViewRootImpl) parent).mIsAnimating = true; 4000 } 4001 } 4002 4003 // If the parent is dirty opaque or not dirty, mark it dirty with the opaque 4004 // flag coming from the child that initiated the invalidate 4005 if (view != null) { 4006 if ((view.mViewFlags & FADING_EDGE_MASK) != 0 && 4007 view.getSolidColor() == 0) { 4008 opaqueFlag = DIRTY; 4009 } 4010 if ((view.mPrivateFlags & DIRTY_MASK) != DIRTY) { 4011 view.mPrivateFlags = (view.mPrivateFlags & ~DIRTY_MASK) | opaqueFlag; 4012 } 4013 } 4014 4015 parent = parent.invalidateChildInParent(location, dirty); 4016 if (view != null) { 4017 // Account for transform on current parent 4018 Matrix m = view.getMatrix(); 4019 if (!m.isIdentity()) { 4020 RectF boundingRect = attachInfo.mTmpTransformRect; 4021 boundingRect.set(dirty); 4022 m.mapRect(boundingRect); 4023 dirty.set((int) boundingRect.left, (int) boundingRect.top, 4024 (int) (boundingRect.right + 0.5f), 4025 (int) (boundingRect.bottom + 0.5f)); 4026 } 4027 } 4028 } while (parent != null); 4029 } 4030 } 4031 } 4032 4033 /** 4034 * Don't call or override this method. It is used for the implementation of 4035 * the view hierarchy. 4036 * 4037 * This implementation returns null if this ViewGroup does not have a parent, 4038 * if this ViewGroup is already fully invalidated or if the dirty rectangle 4039 * does not intersect with this ViewGroup's bounds. 4040 */ 4041 public ViewParent invalidateChildInParent(final int[] location, final Rect dirty) { 4042 if (ViewDebug.TRACE_HIERARCHY) { 4043 ViewDebug.trace(this, ViewDebug.HierarchyTraceType.INVALIDATE_CHILD_IN_PARENT); 4044 } 4045 4046 if ((mPrivateFlags & DRAWN) == DRAWN || 4047 (mPrivateFlags & DRAWING_CACHE_VALID) == DRAWING_CACHE_VALID) { 4048 if ((mGroupFlags & (FLAG_OPTIMIZE_INVALIDATE | FLAG_ANIMATION_DONE)) != 4049 FLAG_OPTIMIZE_INVALIDATE) { 4050 dirty.offset(location[CHILD_LEFT_INDEX] - mScrollX, 4051 location[CHILD_TOP_INDEX] - mScrollY); 4052 4053 final int left = mLeft; 4054 final int top = mTop; 4055 4056 if ((mGroupFlags & FLAG_CLIP_CHILDREN) != FLAG_CLIP_CHILDREN || 4057 dirty.intersect(0, 0, mRight - left, mBottom - top) || 4058 (mPrivateFlags & DRAW_ANIMATION) == DRAW_ANIMATION) { 4059 mPrivateFlags &= ~DRAWING_CACHE_VALID; 4060 4061 location[CHILD_LEFT_INDEX] = left; 4062 location[CHILD_TOP_INDEX] = top; 4063 4064 if (mLayerType != LAYER_TYPE_NONE) { 4065 mLocalDirtyRect.union(dirty); 4066 } 4067 4068 return mParent; 4069 } 4070 } else { 4071 mPrivateFlags &= ~DRAWN & ~DRAWING_CACHE_VALID; 4072 4073 location[CHILD_LEFT_INDEX] = mLeft; 4074 location[CHILD_TOP_INDEX] = mTop; 4075 if ((mGroupFlags & FLAG_CLIP_CHILDREN) == FLAG_CLIP_CHILDREN) { 4076 dirty.set(0, 0, mRight - mLeft, mBottom - mTop); 4077 } else { 4078 // in case the dirty rect extends outside the bounds of this container 4079 dirty.union(0, 0, mRight - mLeft, mBottom - mTop); 4080 } 4081 4082 if (mLayerType != LAYER_TYPE_NONE) { 4083 mLocalDirtyRect.union(dirty); 4084 } 4085 4086 return mParent; 4087 } 4088 } 4089 4090 return null; 4091 } 4092 4093 /** 4094 * Offset a rectangle that is in a descendant's coordinate 4095 * space into our coordinate space. 4096 * @param descendant A descendant of this view 4097 * @param rect A rectangle defined in descendant's coordinate space. 4098 */ 4099 public final void offsetDescendantRectToMyCoords(View descendant, Rect rect) { 4100 offsetRectBetweenParentAndChild(descendant, rect, true, false); 4101 } 4102 4103 /** 4104 * Offset a rectangle that is in our coordinate space into an ancestor's 4105 * coordinate space. 4106 * @param descendant A descendant of this view 4107 * @param rect A rectangle defined in descendant's coordinate space. 4108 */ 4109 public final void offsetRectIntoDescendantCoords(View descendant, Rect rect) { 4110 offsetRectBetweenParentAndChild(descendant, rect, false, false); 4111 } 4112 4113 /** 4114 * Helper method that offsets a rect either from parent to descendant or 4115 * descendant to parent. 4116 */ 4117 void offsetRectBetweenParentAndChild(View descendant, Rect rect, 4118 boolean offsetFromChildToParent, boolean clipToBounds) { 4119 4120 // already in the same coord system :) 4121 if (descendant == this) { 4122 return; 4123 } 4124 4125 ViewParent theParent = descendant.mParent; 4126 4127 // search and offset up to the parent 4128 while ((theParent != null) 4129 && (theParent instanceof View) 4130 && (theParent != this)) { 4131 4132 if (offsetFromChildToParent) { 4133 rect.offset(descendant.mLeft - descendant.mScrollX, 4134 descendant.mTop - descendant.mScrollY); 4135 if (clipToBounds) { 4136 View p = (View) theParent; 4137 rect.intersect(0, 0, p.mRight - p.mLeft, p.mBottom - p.mTop); 4138 } 4139 } else { 4140 if (clipToBounds) { 4141 View p = (View) theParent; 4142 rect.intersect(0, 0, p.mRight - p.mLeft, p.mBottom - p.mTop); 4143 } 4144 rect.offset(descendant.mScrollX - descendant.mLeft, 4145 descendant.mScrollY - descendant.mTop); 4146 } 4147 4148 descendant = (View) theParent; 4149 theParent = descendant.mParent; 4150 } 4151 4152 // now that we are up to this view, need to offset one more time 4153 // to get into our coordinate space 4154 if (theParent == this) { 4155 if (offsetFromChildToParent) { 4156 rect.offset(descendant.mLeft - descendant.mScrollX, 4157 descendant.mTop - descendant.mScrollY); 4158 } else { 4159 rect.offset(descendant.mScrollX - descendant.mLeft, 4160 descendant.mScrollY - descendant.mTop); 4161 } 4162 } else { 4163 throw new IllegalArgumentException("parameter must be a descendant of this view"); 4164 } 4165 } 4166 4167 /** 4168 * Offset the vertical location of all children of this view by the specified number of pixels. 4169 * 4170 * @param offset the number of pixels to offset 4171 * 4172 * @hide 4173 */ 4174 public void offsetChildrenTopAndBottom(int offset) { 4175 final int count = mChildrenCount; 4176 final View[] children = mChildren; 4177 4178 for (int i = 0; i < count; i++) { 4179 final View v = children[i]; 4180 v.mTop += offset; 4181 v.mBottom += offset; 4182 } 4183 } 4184 4185 /** 4186 * {@inheritDoc} 4187 */ 4188 public boolean getChildVisibleRect(View child, Rect r, android.graphics.Point offset) { 4189 int dx = child.mLeft - mScrollX; 4190 int dy = child.mTop - mScrollY; 4191 if (offset != null) { 4192 offset.x += dx; 4193 offset.y += dy; 4194 } 4195 r.offset(dx, dy); 4196 return r.intersect(0, 0, mRight - mLeft, mBottom - mTop) && 4197 (mParent == null || mParent.getChildVisibleRect(this, r, offset)); 4198 } 4199 4200 /** 4201 * {@inheritDoc} 4202 */ 4203 @Override 4204 public final void layout(int l, int t, int r, int b) { 4205 if (mTransition == null || !mTransition.isChangingLayout()) { 4206 super.layout(l, t, r, b); 4207 } else { 4208 // record the fact that we noop'd it; request layout when transition finishes 4209 mLayoutSuppressed = true; 4210 } 4211 } 4212 4213 /** 4214 * {@inheritDoc} 4215 */ 4216 @Override 4217 protected abstract void onLayout(boolean changed, 4218 int l, int t, int r, int b); 4219 4220 /** 4221 * Indicates whether the view group has the ability to animate its children 4222 * after the first layout. 4223 * 4224 * @return true if the children can be animated, false otherwise 4225 */ 4226 protected boolean canAnimate() { 4227 return mLayoutAnimationController != null; 4228 } 4229 4230 /** 4231 * Runs the layout animation. Calling this method triggers a relayout of 4232 * this view group. 4233 */ 4234 public void startLayoutAnimation() { 4235 if (mLayoutAnimationController != null) { 4236 mGroupFlags |= FLAG_RUN_ANIMATION; 4237 requestLayout(); 4238 } 4239 } 4240 4241 /** 4242 * Schedules the layout animation to be played after the next layout pass 4243 * of this view group. This can be used to restart the layout animation 4244 * when the content of the view group changes or when the activity is 4245 * paused and resumed. 4246 */ 4247 public void scheduleLayoutAnimation() { 4248 mGroupFlags |= FLAG_RUN_ANIMATION; 4249 } 4250 4251 /** 4252 * Sets the layout animation controller used to animate the group's 4253 * children after the first layout. 4254 * 4255 * @param controller the animation controller 4256 */ 4257 public void setLayoutAnimation(LayoutAnimationController controller) { 4258 mLayoutAnimationController = controller; 4259 if (mLayoutAnimationController != null) { 4260 mGroupFlags |= FLAG_RUN_ANIMATION; 4261 } 4262 } 4263 4264 /** 4265 * Returns the layout animation controller used to animate the group's 4266 * children. 4267 * 4268 * @return the current animation controller 4269 */ 4270 public LayoutAnimationController getLayoutAnimation() { 4271 return mLayoutAnimationController; 4272 } 4273 4274 /** 4275 * Indicates whether the children's drawing cache is used during a layout 4276 * animation. By default, the drawing cache is enabled but this will prevent 4277 * nested layout animations from working. To nest animations, you must disable 4278 * the cache. 4279 * 4280 * @return true if the animation cache is enabled, false otherwise 4281 * 4282 * @see #setAnimationCacheEnabled(boolean) 4283 * @see View#setDrawingCacheEnabled(boolean) 4284 */ 4285 @ViewDebug.ExportedProperty 4286 public boolean isAnimationCacheEnabled() { 4287 return (mGroupFlags & FLAG_ANIMATION_CACHE) == FLAG_ANIMATION_CACHE; 4288 } 4289 4290 /** 4291 * Enables or disables the children's drawing cache during a layout animation. 4292 * By default, the drawing cache is enabled but this will prevent nested 4293 * layout animations from working. To nest animations, you must disable the 4294 * cache. 4295 * 4296 * @param enabled true to enable the animation cache, false otherwise 4297 * 4298 * @see #isAnimationCacheEnabled() 4299 * @see View#setDrawingCacheEnabled(boolean) 4300 */ 4301 public void setAnimationCacheEnabled(boolean enabled) { 4302 setBooleanFlag(FLAG_ANIMATION_CACHE, enabled); 4303 } 4304 4305 /** 4306 * Indicates whether this ViewGroup will always try to draw its children using their 4307 * drawing cache. By default this property is enabled. 4308 * 4309 * @return true if the animation cache is enabled, false otherwise 4310 * 4311 * @see #setAlwaysDrawnWithCacheEnabled(boolean) 4312 * @see #setChildrenDrawnWithCacheEnabled(boolean) 4313 * @see View#setDrawingCacheEnabled(boolean) 4314 */ 4315 @ViewDebug.ExportedProperty(category = "drawing") 4316 public boolean isAlwaysDrawnWithCacheEnabled() { 4317 return (mGroupFlags & FLAG_ALWAYS_DRAWN_WITH_CACHE) == FLAG_ALWAYS_DRAWN_WITH_CACHE; 4318 } 4319 4320 /** 4321 * Indicates whether this ViewGroup will always try to draw its children using their 4322 * drawing cache. This property can be set to true when the cache rendering is 4323 * slightly different from the children's normal rendering. Renderings can be different, 4324 * for instance, when the cache's quality is set to low. 4325 * 4326 * When this property is disabled, the ViewGroup will use the drawing cache of its 4327 * children only when asked to. It's usually the task of subclasses to tell ViewGroup 4328 * when to start using the drawing cache and when to stop using it. 4329 * 4330 * @param always true to always draw with the drawing cache, false otherwise 4331 * 4332 * @see #isAlwaysDrawnWithCacheEnabled() 4333 * @see #setChildrenDrawnWithCacheEnabled(boolean) 4334 * @see View#setDrawingCacheEnabled(boolean) 4335 * @see View#setDrawingCacheQuality(int) 4336 */ 4337 public void setAlwaysDrawnWithCacheEnabled(boolean always) { 4338 setBooleanFlag(FLAG_ALWAYS_DRAWN_WITH_CACHE, always); 4339 } 4340 4341 /** 4342 * Indicates whether the ViewGroup is currently drawing its children using 4343 * their drawing cache. 4344 * 4345 * @return true if children should be drawn with their cache, false otherwise 4346 * 4347 * @see #setAlwaysDrawnWithCacheEnabled(boolean) 4348 * @see #setChildrenDrawnWithCacheEnabled(boolean) 4349 */ 4350 @ViewDebug.ExportedProperty(category = "drawing") 4351 protected boolean isChildrenDrawnWithCacheEnabled() { 4352 return (mGroupFlags & FLAG_CHILDREN_DRAWN_WITH_CACHE) == FLAG_CHILDREN_DRAWN_WITH_CACHE; 4353 } 4354 4355 /** 4356 * Tells the ViewGroup to draw its children using their drawing cache. This property 4357 * is ignored when {@link #isAlwaysDrawnWithCacheEnabled()} is true. A child's drawing cache 4358 * will be used only if it has been enabled. 4359 * 4360 * Subclasses should call this method to start and stop using the drawing cache when 4361 * they perform performance sensitive operations, like scrolling or animating. 4362 * 4363 * @param enabled true if children should be drawn with their cache, false otherwise 4364 * 4365 * @see #setAlwaysDrawnWithCacheEnabled(boolean) 4366 * @see #isChildrenDrawnWithCacheEnabled() 4367 */ 4368 protected void setChildrenDrawnWithCacheEnabled(boolean enabled) { 4369 setBooleanFlag(FLAG_CHILDREN_DRAWN_WITH_CACHE, enabled); 4370 } 4371 4372 /** 4373 * Indicates whether the ViewGroup is drawing its children in the order defined by 4374 * {@link #getChildDrawingOrder(int, int)}. 4375 * 4376 * @return true if children drawing order is defined by {@link #getChildDrawingOrder(int, int)}, 4377 * false otherwise 4378 * 4379 * @see #setChildrenDrawingOrderEnabled(boolean) 4380 * @see #getChildDrawingOrder(int, int) 4381 */ 4382 @ViewDebug.ExportedProperty(category = "drawing") 4383 protected boolean isChildrenDrawingOrderEnabled() { 4384 return (mGroupFlags & FLAG_USE_CHILD_DRAWING_ORDER) == FLAG_USE_CHILD_DRAWING_ORDER; 4385 } 4386 4387 /** 4388 * Tells the ViewGroup whether to draw its children in the order defined by the method 4389 * {@link #getChildDrawingOrder(int, int)}. 4390 * 4391 * @param enabled true if the order of the children when drawing is determined by 4392 * {@link #getChildDrawingOrder(int, int)}, false otherwise 4393 * 4394 * @see #isChildrenDrawingOrderEnabled() 4395 * @see #getChildDrawingOrder(int, int) 4396 */ 4397 protected void setChildrenDrawingOrderEnabled(boolean enabled) { 4398 setBooleanFlag(FLAG_USE_CHILD_DRAWING_ORDER, enabled); 4399 } 4400 4401 private void setBooleanFlag(int flag, boolean value) { 4402 if (value) { 4403 mGroupFlags |= flag; 4404 } else { 4405 mGroupFlags &= ~flag; 4406 } 4407 } 4408 4409 /** 4410 * Returns an integer indicating what types of drawing caches are kept in memory. 4411 * 4412 * @see #setPersistentDrawingCache(int) 4413 * @see #setAnimationCacheEnabled(boolean) 4414 * 4415 * @return one or a combination of {@link #PERSISTENT_NO_CACHE}, 4416 * {@link #PERSISTENT_ANIMATION_CACHE}, {@link #PERSISTENT_SCROLLING_CACHE} 4417 * and {@link #PERSISTENT_ALL_CACHES} 4418 */ 4419 @ViewDebug.ExportedProperty(category = "drawing", mapping = { 4420 @ViewDebug.IntToString(from = PERSISTENT_NO_CACHE, to = "NONE"), 4421 @ViewDebug.IntToString(from = PERSISTENT_ANIMATION_CACHE, to = "ANIMATION"), 4422 @ViewDebug.IntToString(from = PERSISTENT_SCROLLING_CACHE, to = "SCROLLING"), 4423 @ViewDebug.IntToString(from = PERSISTENT_ALL_CACHES, to = "ALL") 4424 }) 4425 public int getPersistentDrawingCache() { 4426 return mPersistentDrawingCache; 4427 } 4428 4429 /** 4430 * Indicates what types of drawing caches should be kept in memory after 4431 * they have been created. 4432 * 4433 * @see #getPersistentDrawingCache() 4434 * @see #setAnimationCacheEnabled(boolean) 4435 * 4436 * @param drawingCacheToKeep one or a combination of {@link #PERSISTENT_NO_CACHE}, 4437 * {@link #PERSISTENT_ANIMATION_CACHE}, {@link #PERSISTENT_SCROLLING_CACHE} 4438 * and {@link #PERSISTENT_ALL_CACHES} 4439 */ 4440 public void setPersistentDrawingCache(int drawingCacheToKeep) { 4441 mPersistentDrawingCache = drawingCacheToKeep & PERSISTENT_ALL_CACHES; 4442 } 4443 4444 /** 4445 * Returns a new set of layout parameters based on the supplied attributes set. 4446 * 4447 * @param attrs the attributes to build the layout parameters from 4448 * 4449 * @return an instance of {@link android.view.ViewGroup.LayoutParams} or one 4450 * of its descendants 4451 */ 4452 public LayoutParams generateLayoutParams(AttributeSet attrs) { 4453 return new LayoutParams(getContext(), attrs); 4454 } 4455 4456 /** 4457 * Returns a safe set of layout parameters based on the supplied layout params. 4458 * When a ViewGroup is passed a View whose layout params do not pass the test of 4459 * {@link #checkLayoutParams(android.view.ViewGroup.LayoutParams)}, this method 4460 * is invoked. This method should return a new set of layout params suitable for 4461 * this ViewGroup, possibly by copying the appropriate attributes from the 4462 * specified set of layout params. 4463 * 4464 * @param p The layout parameters to convert into a suitable set of layout parameters 4465 * for this ViewGroup. 4466 * 4467 * @return an instance of {@link android.view.ViewGroup.LayoutParams} or one 4468 * of its descendants 4469 */ 4470 protected LayoutParams generateLayoutParams(ViewGroup.LayoutParams p) { 4471 return p; 4472 } 4473 4474 /** 4475 * Returns a set of default layout parameters. These parameters are requested 4476 * when the View passed to {@link #addView(View)} has no layout parameters 4477 * already set. If null is returned, an exception is thrown from addView. 4478 * 4479 * @return a set of default layout parameters or null 4480 */ 4481 protected LayoutParams generateDefaultLayoutParams() { 4482 return new LayoutParams(LayoutParams.WRAP_CONTENT, LayoutParams.WRAP_CONTENT); 4483 } 4484 4485 /** 4486 * @hide 4487 */ 4488 @Override 4489 protected boolean dispatchConsistencyCheck(int consistency) { 4490 boolean result = super.dispatchConsistencyCheck(consistency); 4491 4492 final int count = mChildrenCount; 4493 final View[] children = mChildren; 4494 for (int i = 0; i < count; i++) { 4495 if (!children[i].dispatchConsistencyCheck(consistency)) result = false; 4496 } 4497 4498 return result; 4499 } 4500 4501 /** 4502 * @hide 4503 */ 4504 @Override 4505 protected boolean onConsistencyCheck(int consistency) { 4506 boolean result = super.onConsistencyCheck(consistency); 4507 4508 final boolean checkLayout = (consistency & ViewDebug.CONSISTENCY_LAYOUT) != 0; 4509 final boolean checkDrawing = (consistency & ViewDebug.CONSISTENCY_DRAWING) != 0; 4510 4511 if (checkLayout) { 4512 final int count = mChildrenCount; 4513 final View[] children = mChildren; 4514 for (int i = 0; i < count; i++) { 4515 if (children[i].getParent() != this) { 4516 result = false; 4517 android.util.Log.d(ViewDebug.CONSISTENCY_LOG_TAG, 4518 "View " + children[i] + " has no parent/a parent that is not " + this); 4519 } 4520 } 4521 } 4522 4523 if (checkDrawing) { 4524 // If this group is dirty, check that the parent is dirty as well 4525 if ((mPrivateFlags & DIRTY_MASK) != 0) { 4526 final ViewParent parent = getParent(); 4527 if (parent != null && !(parent instanceof ViewRootImpl)) { 4528 if ((((View) parent).mPrivateFlags & DIRTY_MASK) == 0) { 4529 result = false; 4530 android.util.Log.d(ViewDebug.CONSISTENCY_LOG_TAG, 4531 "ViewGroup " + this + " is dirty but its parent is not: " + this); 4532 } 4533 } 4534 } 4535 } 4536 4537 return result; 4538 } 4539 4540 /** 4541 * {@inheritDoc} 4542 */ 4543 @Override 4544 protected void debug(int depth) { 4545 super.debug(depth); 4546 String output; 4547 4548 if (mFocused != null) { 4549 output = debugIndent(depth); 4550 output += "mFocused"; 4551 Log.d(VIEW_LOG_TAG, output); 4552 } 4553 if (mChildrenCount != 0) { 4554 output = debugIndent(depth); 4555 output += "{"; 4556 Log.d(VIEW_LOG_TAG, output); 4557 } 4558 int count = mChildrenCount; 4559 for (int i = 0; i < count; i++) { 4560 View child = mChildren[i]; 4561 child.debug(depth + 1); 4562 } 4563 4564 if (mChildrenCount != 0) { 4565 output = debugIndent(depth); 4566 output += "}"; 4567 Log.d(VIEW_LOG_TAG, output); 4568 } 4569 } 4570 4571 /** 4572 * Returns the position in the group of the specified child view. 4573 * 4574 * @param child the view for which to get the position 4575 * @return a positive integer representing the position of the view in the 4576 * group, or -1 if the view does not exist in the group 4577 */ 4578 public int indexOfChild(View child) { 4579 final int count = mChildrenCount; 4580 final View[] children = mChildren; 4581 for (int i = 0; i < count; i++) { 4582 if (children[i] == child) { 4583 return i; 4584 } 4585 } 4586 return -1; 4587 } 4588 4589 /** 4590 * Returns the number of children in the group. 4591 * 4592 * @return a positive integer representing the number of children in 4593 * the group 4594 */ 4595 public int getChildCount() { 4596 return mChildrenCount; 4597 } 4598 4599 /** 4600 * Returns the view at the specified position in the group. 4601 * 4602 * @param index the position at which to get the view from 4603 * @return the view at the specified position or null if the position 4604 * does not exist within the group 4605 */ 4606 public View getChildAt(int index) { 4607 if (index < 0 || index >= mChildrenCount) { 4608 return null; 4609 } 4610 return mChildren[index]; 4611 } 4612 4613 /** 4614 * Ask all of the children of this view to measure themselves, taking into 4615 * account both the MeasureSpec requirements for this view and its padding. 4616 * We skip children that are in the GONE state The heavy lifting is done in 4617 * getChildMeasureSpec. 4618 * 4619 * @param widthMeasureSpec The width requirements for this view 4620 * @param heightMeasureSpec The height requirements for this view 4621 */ 4622 protected void measureChildren(int widthMeasureSpec, int heightMeasureSpec) { 4623 final int size = mChildrenCount; 4624 final View[] children = mChildren; 4625 for (int i = 0; i < size; ++i) { 4626 final View child = children[i]; 4627 if ((child.mViewFlags & VISIBILITY_MASK) != GONE) { 4628 measureChild(child, widthMeasureSpec, heightMeasureSpec); 4629 } 4630 } 4631 } 4632 4633 /** 4634 * Ask one of the children of this view to measure itself, taking into 4635 * account both the MeasureSpec requirements for this view and its padding. 4636 * The heavy lifting is done in getChildMeasureSpec. 4637 * 4638 * @param child The child to measure 4639 * @param parentWidthMeasureSpec The width requirements for this view 4640 * @param parentHeightMeasureSpec The height requirements for this view 4641 */ 4642 protected void measureChild(View child, int parentWidthMeasureSpec, 4643 int parentHeightMeasureSpec) { 4644 final LayoutParams lp = child.getLayoutParams(); 4645 4646 final int childWidthMeasureSpec = getChildMeasureSpec(parentWidthMeasureSpec, 4647 mPaddingLeft + mPaddingRight, lp.width); 4648 final int childHeightMeasureSpec = getChildMeasureSpec(parentHeightMeasureSpec, 4649 mPaddingTop + mPaddingBottom, lp.height); 4650 4651 child.measure(childWidthMeasureSpec, childHeightMeasureSpec); 4652 } 4653 4654 /** 4655 * Ask one of the children of this view to measure itself, taking into 4656 * account both the MeasureSpec requirements for this view and its padding 4657 * and margins. The child must have MarginLayoutParams The heavy lifting is 4658 * done in getChildMeasureSpec. 4659 * 4660 * @param child The child to measure 4661 * @param parentWidthMeasureSpec The width requirements for this view 4662 * @param widthUsed Extra space that has been used up by the parent 4663 * horizontally (possibly by other children of the parent) 4664 * @param parentHeightMeasureSpec The height requirements for this view 4665 * @param heightUsed Extra space that has been used up by the parent 4666 * vertically (possibly by other children of the parent) 4667 */ 4668 protected void measureChildWithMargins(View child, 4669 int parentWidthMeasureSpec, int widthUsed, 4670 int parentHeightMeasureSpec, int heightUsed) { 4671 final MarginLayoutParams lp = (MarginLayoutParams) child.getLayoutParams(); 4672 4673 final int childWidthMeasureSpec = getChildMeasureSpec(parentWidthMeasureSpec, 4674 mPaddingLeft + mPaddingRight + lp.leftMargin + lp.rightMargin 4675 + widthUsed, lp.width); 4676 final int childHeightMeasureSpec = getChildMeasureSpec(parentHeightMeasureSpec, 4677 mPaddingTop + mPaddingBottom + lp.topMargin + lp.bottomMargin 4678 + heightUsed, lp.height); 4679 4680 child.measure(childWidthMeasureSpec, childHeightMeasureSpec); 4681 } 4682 4683 /** 4684 * Does the hard part of measureChildren: figuring out the MeasureSpec to 4685 * pass to a particular child. This method figures out the right MeasureSpec 4686 * for one dimension (height or width) of one child view. 4687 * 4688 * The goal is to combine information from our MeasureSpec with the 4689 * LayoutParams of the child to get the best possible results. For example, 4690 * if the this view knows its size (because its MeasureSpec has a mode of 4691 * EXACTLY), and the child has indicated in its LayoutParams that it wants 4692 * to be the same size as the parent, the parent should ask the child to 4693 * layout given an exact size. 4694 * 4695 * @param spec The requirements for this view 4696 * @param padding The padding of this view for the current dimension and 4697 * margins, if applicable 4698 * @param childDimension How big the child wants to be in the current 4699 * dimension 4700 * @return a MeasureSpec integer for the child 4701 */ 4702 public static int getChildMeasureSpec(int spec, int padding, int childDimension) { 4703 int specMode = MeasureSpec.getMode(spec); 4704 int specSize = MeasureSpec.getSize(spec); 4705 4706 int size = Math.max(0, specSize - padding); 4707 4708 int resultSize = 0; 4709 int resultMode = 0; 4710 4711 switch (specMode) { 4712 // Parent has imposed an exact size on us 4713 case MeasureSpec.EXACTLY: 4714 if (childDimension >= 0) { 4715 resultSize = childDimension; 4716 resultMode = MeasureSpec.EXACTLY; 4717 } else if (childDimension == LayoutParams.MATCH_PARENT) { 4718 // Child wants to be our size. So be it. 4719 resultSize = size; 4720 resultMode = MeasureSpec.EXACTLY; 4721 } else if (childDimension == LayoutParams.WRAP_CONTENT) { 4722 // Child wants to determine its own size. It can't be 4723 // bigger than us. 4724 resultSize = size; 4725 resultMode = MeasureSpec.AT_MOST; 4726 } 4727 break; 4728 4729 // Parent has imposed a maximum size on us 4730 case MeasureSpec.AT_MOST: 4731 if (childDimension >= 0) { 4732 // Child wants a specific size... so be it 4733 resultSize = childDimension; 4734 resultMode = MeasureSpec.EXACTLY; 4735 } else if (childDimension == LayoutParams.MATCH_PARENT) { 4736 // Child wants to be our size, but our size is not fixed. 4737 // Constrain child to not be bigger than us. 4738 resultSize = size; 4739 resultMode = MeasureSpec.AT_MOST; 4740 } else if (childDimension == LayoutParams.WRAP_CONTENT) { 4741 // Child wants to determine its own size. It can't be 4742 // bigger than us. 4743 resultSize = size; 4744 resultMode = MeasureSpec.AT_MOST; 4745 } 4746 break; 4747 4748 // Parent asked to see how big we want to be 4749 case MeasureSpec.UNSPECIFIED: 4750 if (childDimension >= 0) { 4751 // Child wants a specific size... let him have it 4752 resultSize = childDimension; 4753 resultMode = MeasureSpec.EXACTLY; 4754 } else if (childDimension == LayoutParams.MATCH_PARENT) { 4755 // Child wants to be our size... find out how big it should 4756 // be 4757 resultSize = 0; 4758 resultMode = MeasureSpec.UNSPECIFIED; 4759 } else if (childDimension == LayoutParams.WRAP_CONTENT) { 4760 // Child wants to determine its own size.... find out how 4761 // big it should be 4762 resultSize = 0; 4763 resultMode = MeasureSpec.UNSPECIFIED; 4764 } 4765 break; 4766 } 4767 return MeasureSpec.makeMeasureSpec(resultSize, resultMode); 4768 } 4769 4770 4771 /** 4772 * Removes any pending animations for views that have been removed. Call 4773 * this if you don't want animations for exiting views to stack up. 4774 */ 4775 public void clearDisappearingChildren() { 4776 if (mDisappearingChildren != null) { 4777 mDisappearingChildren.clear(); 4778 } 4779 } 4780 4781 /** 4782 * Add a view which is removed from mChildren but still needs animation 4783 * 4784 * @param v View to add 4785 */ 4786 private void addDisappearingView(View v) { 4787 ArrayList<View> disappearingChildren = mDisappearingChildren; 4788 4789 if (disappearingChildren == null) { 4790 disappearingChildren = mDisappearingChildren = new ArrayList<View>(); 4791 } 4792 4793 disappearingChildren.add(v); 4794 } 4795 4796 /** 4797 * Cleanup a view when its animation is done. This may mean removing it from 4798 * the list of disappearing views. 4799 * 4800 * @param view The view whose animation has finished 4801 * @param animation The animation, cannot be null 4802 */ 4803 private void finishAnimatingView(final View view, Animation animation) { 4804 final ArrayList<View> disappearingChildren = mDisappearingChildren; 4805 if (disappearingChildren != null) { 4806 if (disappearingChildren.contains(view)) { 4807 disappearingChildren.remove(view); 4808 4809 if (view.mAttachInfo != null) { 4810 view.dispatchDetachedFromWindow(); 4811 } 4812 4813 view.clearAnimation(); 4814 mGroupFlags |= FLAG_INVALIDATE_REQUIRED; 4815 } 4816 } 4817 4818 if (animation != null && !animation.getFillAfter()) { 4819 view.clearAnimation(); 4820 } 4821 4822 if ((view.mPrivateFlags & ANIMATION_STARTED) == ANIMATION_STARTED) { 4823 view.onAnimationEnd(); 4824 // Should be performed by onAnimationEnd() but this avoid an infinite loop, 4825 // so we'd rather be safe than sorry 4826 view.mPrivateFlags &= ~ANIMATION_STARTED; 4827 // Draw one more frame after the animation is done 4828 mGroupFlags |= FLAG_INVALIDATE_REQUIRED; 4829 } 4830 } 4831 4832 /** 4833 * Utility function called by View during invalidation to determine whether a view that 4834 * is invisible or gone should still be invalidated because it is being transitioned (and 4835 * therefore still needs to be drawn). 4836 */ 4837 boolean isViewTransitioning(View view) { 4838 return (mTransitioningViews != null && mTransitioningViews.contains(view)); 4839 } 4840 4841 /** 4842 * This method tells the ViewGroup that the given View object, which should have this 4843 * ViewGroup as its parent, 4844 * should be kept around (re-displayed when the ViewGroup draws its children) even if it 4845 * is removed from its parent. This allows animations, such as those used by 4846 * {@link android.app.Fragment} and {@link android.animation.LayoutTransition} to animate 4847 * the removal of views. A call to this method should always be accompanied by a later call 4848 * to {@link #endViewTransition(View)}, such as after an animation on the View has finished, 4849 * so that the View finally gets removed. 4850 * 4851 * @param view The View object to be kept visible even if it gets removed from its parent. 4852 */ 4853 public void startViewTransition(View view) { 4854 if (view.mParent == this) { 4855 if (mTransitioningViews == null) { 4856 mTransitioningViews = new ArrayList<View>(); 4857 } 4858 mTransitioningViews.add(view); 4859 } 4860 } 4861 4862 /** 4863 * This method should always be called following an earlier call to 4864 * {@link #startViewTransition(View)}. The given View is finally removed from its parent 4865 * and will no longer be displayed. Note that this method does not perform the functionality 4866 * of removing a view from its parent; it just discontinues the display of a View that 4867 * has previously been removed. 4868 * 4869 * @return view The View object that has been removed but is being kept around in the visible 4870 * hierarchy by an earlier call to {@link #startViewTransition(View)}. 4871 */ 4872 public void endViewTransition(View view) { 4873 if (mTransitioningViews != null) { 4874 mTransitioningViews.remove(view); 4875 final ArrayList<View> disappearingChildren = mDisappearingChildren; 4876 if (disappearingChildren != null && disappearingChildren.contains(view)) { 4877 disappearingChildren.remove(view); 4878 if (mVisibilityChangingChildren != null && 4879 mVisibilityChangingChildren.contains(view)) { 4880 mVisibilityChangingChildren.remove(view); 4881 } else { 4882 if (view.mAttachInfo != null) { 4883 view.dispatchDetachedFromWindow(); 4884 } 4885 if (view.mParent != null) { 4886 view.mParent = null; 4887 } 4888 } 4889 mGroupFlags |= FLAG_INVALIDATE_REQUIRED; 4890 } 4891 } 4892 } 4893 4894 private LayoutTransition.TransitionListener mLayoutTransitionListener = 4895 new LayoutTransition.TransitionListener() { 4896 @Override 4897 public void startTransition(LayoutTransition transition, ViewGroup container, 4898 View view, int transitionType) { 4899 // We only care about disappearing items, since we need special logic to keep 4900 // those items visible after they've been 'removed' 4901 if (transitionType == LayoutTransition.DISAPPEARING) { 4902 startViewTransition(view); 4903 } 4904 } 4905 4906 @Override 4907 public void endTransition(LayoutTransition transition, ViewGroup container, 4908 View view, int transitionType) { 4909 if (mLayoutSuppressed && !transition.isChangingLayout()) { 4910 requestLayout(); 4911 mLayoutSuppressed = false; 4912 } 4913 if (transitionType == LayoutTransition.DISAPPEARING && mTransitioningViews != null) { 4914 endViewTransition(view); 4915 } 4916 } 4917 }; 4918 4919 /** 4920 * {@inheritDoc} 4921 */ 4922 @Override 4923 public boolean gatherTransparentRegion(Region region) { 4924 // If no transparent regions requested, we are always opaque. 4925 final boolean meOpaque = (mPrivateFlags & View.REQUEST_TRANSPARENT_REGIONS) == 0; 4926 if (meOpaque && region == null) { 4927 // The caller doesn't care about the region, so stop now. 4928 return true; 4929 } 4930 super.gatherTransparentRegion(region); 4931 final View[] children = mChildren; 4932 final int count = mChildrenCount; 4933 boolean noneOfTheChildrenAreTransparent = true; 4934 for (int i = 0; i < count; i++) { 4935 final View child = children[i]; 4936 if ((child.mViewFlags & VISIBILITY_MASK) == VISIBLE || child.getAnimation() != null) { 4937 if (!child.gatherTransparentRegion(region)) { 4938 noneOfTheChildrenAreTransparent = false; 4939 } 4940 } 4941 } 4942 return meOpaque || noneOfTheChildrenAreTransparent; 4943 } 4944 4945 /** 4946 * {@inheritDoc} 4947 */ 4948 public void requestTransparentRegion(View child) { 4949 if (child != null) { 4950 child.mPrivateFlags |= View.REQUEST_TRANSPARENT_REGIONS; 4951 if (mParent != null) { 4952 mParent.requestTransparentRegion(this); 4953 } 4954 } 4955 } 4956 4957 4958 @Override 4959 protected boolean fitSystemWindows(Rect insets) { 4960 boolean done = super.fitSystemWindows(insets); 4961 if (!done) { 4962 final int count = mChildrenCount; 4963 final View[] children = mChildren; 4964 for (int i = 0; i < count; i++) { 4965 done = children[i].fitSystemWindows(insets); 4966 if (done) { 4967 break; 4968 } 4969 } 4970 } 4971 return done; 4972 } 4973 4974 /** 4975 * Returns the animation listener to which layout animation events are 4976 * sent. 4977 * 4978 * @return an {@link android.view.animation.Animation.AnimationListener} 4979 */ 4980 public Animation.AnimationListener getLayoutAnimationListener() { 4981 return mAnimationListener; 4982 } 4983 4984 @Override 4985 protected void drawableStateChanged() { 4986 super.drawableStateChanged(); 4987 4988 if ((mGroupFlags & FLAG_NOTIFY_CHILDREN_ON_DRAWABLE_STATE_CHANGE) != 0) { 4989 if ((mGroupFlags & FLAG_ADD_STATES_FROM_CHILDREN) != 0) { 4990 throw new IllegalStateException("addStateFromChildren cannot be enabled if a" 4991 + " child has duplicateParentState set to true"); 4992 } 4993 4994 final View[] children = mChildren; 4995 final int count = mChildrenCount; 4996 4997 for (int i = 0; i < count; i++) { 4998 final View child = children[i]; 4999 if ((child.mViewFlags & DUPLICATE_PARENT_STATE) != 0) { 5000 child.refreshDrawableState(); 5001 } 5002 } 5003 } 5004 } 5005 5006 @Override 5007 public void jumpDrawablesToCurrentState() { 5008 super.jumpDrawablesToCurrentState(); 5009 final View[] children = mChildren; 5010 final int count = mChildrenCount; 5011 for (int i = 0; i < count; i++) { 5012 children[i].jumpDrawablesToCurrentState(); 5013 } 5014 } 5015 5016 @Override 5017 protected int[] onCreateDrawableState(int extraSpace) { 5018 if ((mGroupFlags & FLAG_ADD_STATES_FROM_CHILDREN) == 0) { 5019 return super.onCreateDrawableState(extraSpace); 5020 } 5021 5022 int need = 0; 5023 int n = getChildCount(); 5024 for (int i = 0; i < n; i++) { 5025 int[] childState = getChildAt(i).getDrawableState(); 5026 5027 if (childState != null) { 5028 need += childState.length; 5029 } 5030 } 5031 5032 int[] state = super.onCreateDrawableState(extraSpace + need); 5033 5034 for (int i = 0; i < n; i++) { 5035 int[] childState = getChildAt(i).getDrawableState(); 5036 5037 if (childState != null) { 5038 state = mergeDrawableStates(state, childState); 5039 } 5040 } 5041 5042 return state; 5043 } 5044 5045 /** 5046 * Sets whether this ViewGroup's drawable states also include 5047 * its children's drawable states. This is used, for example, to 5048 * make a group appear to be focused when its child EditText or button 5049 * is focused. 5050 */ 5051 public void setAddStatesFromChildren(boolean addsStates) { 5052 if (addsStates) { 5053 mGroupFlags |= FLAG_ADD_STATES_FROM_CHILDREN; 5054 } else { 5055 mGroupFlags &= ~FLAG_ADD_STATES_FROM_CHILDREN; 5056 } 5057 5058 refreshDrawableState(); 5059 } 5060 5061 /** 5062 * Returns whether this ViewGroup's drawable states also include 5063 * its children's drawable states. This is used, for example, to 5064 * make a group appear to be focused when its child EditText or button 5065 * is focused. 5066 */ 5067 public boolean addStatesFromChildren() { 5068 return (mGroupFlags & FLAG_ADD_STATES_FROM_CHILDREN) != 0; 5069 } 5070 5071 /** 5072 * If {link #addStatesFromChildren} is true, refreshes this group's 5073 * drawable state (to include the states from its children). 5074 */ 5075 public void childDrawableStateChanged(View child) { 5076 if ((mGroupFlags & FLAG_ADD_STATES_FROM_CHILDREN) != 0) { 5077 refreshDrawableState(); 5078 } 5079 } 5080 5081 /** 5082 * Specifies the animation listener to which layout animation events must 5083 * be sent. Only 5084 * {@link android.view.animation.Animation.AnimationListener#onAnimationStart(Animation)} 5085 * and 5086 * {@link android.view.animation.Animation.AnimationListener#onAnimationEnd(Animation)} 5087 * are invoked. 5088 * 5089 * @param animationListener the layout animation listener 5090 */ 5091 public void setLayoutAnimationListener(Animation.AnimationListener animationListener) { 5092 mAnimationListener = animationListener; 5093 } 5094 5095 /** 5096 * This method is called by LayoutTransition when there are 'changing' animations that need 5097 * to start after the layout/setup phase. The request is forwarded to the ViewAncestor, who 5098 * starts all pending transitions prior to the drawing phase in the current traversal. 5099 * 5100 * @param transition The LayoutTransition to be started on the next traversal. 5101 * 5102 * @hide 5103 */ 5104 public void requestTransitionStart(LayoutTransition transition) { 5105 ViewRootImpl viewAncestor = getViewRootImpl(); 5106 if (viewAncestor != null) { 5107 viewAncestor.requestTransitionStart(transition); 5108 } 5109 } 5110 5111 @Override 5112 protected void resetResolvedLayoutDirection() { 5113 super.resetResolvedLayoutDirection(); 5114 5115 // Take care of resetting the children resolution too 5116 final int count = getChildCount(); 5117 for (int i = 0; i < count; i++) { 5118 final View child = getChildAt(i); 5119 if (child.getLayoutDirection() == LAYOUT_DIRECTION_INHERIT) { 5120 child.resetResolvedLayoutDirection(); 5121 } 5122 } 5123 } 5124 5125 @Override 5126 protected void resetResolvedTextDirection() { 5127 super.resetResolvedTextDirection(); 5128 5129 // Take care of resetting the children resolution too 5130 final int count = getChildCount(); 5131 for (int i = 0; i < count; i++) { 5132 final View child = getChildAt(i); 5133 if (child.getTextDirection() == TEXT_DIRECTION_INHERIT) { 5134 child.resetResolvedTextDirection(); 5135 } 5136 } 5137 } 5138 5139 /** 5140 * Return true if the pressed state should be delayed for children or descendants of this 5141 * ViewGroup. Generally, this should be done for containers that can scroll, such as a List. 5142 * This prevents the pressed state from appearing when the user is actually trying to scroll 5143 * the content. 5144 * 5145 * The default implementation returns true for compatibility reasons. Subclasses that do 5146 * not scroll should generally override this method and return false. 5147 */ 5148 public boolean shouldDelayChildPressedState() { 5149 return true; 5150 } 5151 5152 /** 5153 * LayoutParams are used by views to tell their parents how they want to be 5154 * laid out. See 5155 * {@link android.R.styleable#ViewGroup_Layout ViewGroup Layout Attributes} 5156 * for a list of all child view attributes that this class supports. 5157 * 5158 * <p> 5159 * The base LayoutParams class just describes how big the view wants to be 5160 * for both width and height. For each dimension, it can specify one of: 5161 * <ul> 5162 * <li>FILL_PARENT (renamed MATCH_PARENT in API Level 8 and higher), which 5163 * means that the view wants to be as big as its parent (minus padding) 5164 * <li> WRAP_CONTENT, which means that the view wants to be just big enough 5165 * to enclose its content (plus padding) 5166 * <li> an exact number 5167 * </ul> 5168 * There are subclasses of LayoutParams for different subclasses of 5169 * ViewGroup. For example, AbsoluteLayout has its own subclass of 5170 * LayoutParams which adds an X and Y value.</p> 5171 * 5172 * <div class="special reference"> 5173 * <h3>Developer Guides</h3> 5174 * <p>For more information about creating user interface layouts, read the 5175 * <a href="{@docRoot}guide/topics/ui/declaring-layout.html">XML Layouts</a> developer 5176 * guide.</p></div> 5177 * 5178 * @attr ref android.R.styleable#ViewGroup_Layout_layout_height 5179 * @attr ref android.R.styleable#ViewGroup_Layout_layout_width 5180 */ 5181 public static class LayoutParams { 5182 /** 5183 * Special value for the height or width requested by a View. 5184 * FILL_PARENT means that the view wants to be as big as its parent, 5185 * minus the parent's padding, if any. This value is deprecated 5186 * starting in API Level 8 and replaced by {@link #MATCH_PARENT}. 5187 */ 5188 @SuppressWarnings({"UnusedDeclaration"}) 5189 @Deprecated 5190 public static final int FILL_PARENT = -1; 5191 5192 /** 5193 * Special value for the height or width requested by a View. 5194 * MATCH_PARENT means that the view wants to be as big as its parent, 5195 * minus the parent's padding, if any. Introduced in API Level 8. 5196 */ 5197 public static final int MATCH_PARENT = -1; 5198 5199 /** 5200 * Special value for the height or width requested by a View. 5201 * WRAP_CONTENT means that the view wants to be just large enough to fit 5202 * its own internal content, taking its own padding into account. 5203 */ 5204 public static final int WRAP_CONTENT = -2; 5205 5206 /** 5207 * Information about how wide the view wants to be. Can be one of the 5208 * constants FILL_PARENT (replaced by MATCH_PARENT , 5209 * in API Level 8) or WRAP_CONTENT. or an exact size. 5210 */ 5211 @ViewDebug.ExportedProperty(category = "layout", mapping = { 5212 @ViewDebug.IntToString(from = MATCH_PARENT, to = "MATCH_PARENT"), 5213 @ViewDebug.IntToString(from = WRAP_CONTENT, to = "WRAP_CONTENT") 5214 }) 5215 public int width; 5216 5217 /** 5218 * Information about how tall the view wants to be. Can be one of the 5219 * constants FILL_PARENT (replaced by MATCH_PARENT , 5220 * in API Level 8) or WRAP_CONTENT. or an exact size. 5221 */ 5222 @ViewDebug.ExportedProperty(category = "layout", mapping = { 5223 @ViewDebug.IntToString(from = MATCH_PARENT, to = "MATCH_PARENT"), 5224 @ViewDebug.IntToString(from = WRAP_CONTENT, to = "WRAP_CONTENT") 5225 }) 5226 public int height; 5227 5228 /** 5229 * Used to animate layouts. 5230 */ 5231 public LayoutAnimationController.AnimationParameters layoutAnimationParameters; 5232 5233 /** 5234 * Creates a new set of layout parameters. The values are extracted from 5235 * the supplied attributes set and context. The XML attributes mapped 5236 * to this set of layout parameters are: 5237 * 5238 * <ul> 5239 * <li><code>layout_width</code>: the width, either an exact value, 5240 * {@link #WRAP_CONTENT}, or {@link #FILL_PARENT} (replaced by 5241 * {@link #MATCH_PARENT} in API Level 8)</li> 5242 * <li><code>layout_height</code>: the height, either an exact value, 5243 * {@link #WRAP_CONTENT}, or {@link #FILL_PARENT} (replaced by 5244 * {@link #MATCH_PARENT} in API Level 8)</li> 5245 * </ul> 5246 * 5247 * @param c the application environment 5248 * @param attrs the set of attributes from which to extract the layout 5249 * parameters' values 5250 */ 5251 public LayoutParams(Context c, AttributeSet attrs) { 5252 TypedArray a = c.obtainStyledAttributes(attrs, R.styleable.ViewGroup_Layout); 5253 setBaseAttributes(a, 5254 R.styleable.ViewGroup_Layout_layout_width, 5255 R.styleable.ViewGroup_Layout_layout_height); 5256 a.recycle(); 5257 } 5258 5259 /** 5260 * Creates a new set of layout parameters with the specified width 5261 * and height. 5262 * 5263 * @param width the width, either {@link #WRAP_CONTENT}, 5264 * {@link #FILL_PARENT} (replaced by {@link #MATCH_PARENT} in 5265 * API Level 8), or a fixed size in pixels 5266 * @param height the height, either {@link #WRAP_CONTENT}, 5267 * {@link #FILL_PARENT} (replaced by {@link #MATCH_PARENT} in 5268 * API Level 8), or a fixed size in pixels 5269 */ 5270 public LayoutParams(int width, int height) { 5271 this.width = width; 5272 this.height = height; 5273 } 5274 5275 /** 5276 * Copy constructor. Clones the width and height values of the source. 5277 * 5278 * @param source The layout params to copy from. 5279 */ 5280 public LayoutParams(LayoutParams source) { 5281 this.width = source.width; 5282 this.height = source.height; 5283 } 5284 5285 /** 5286 * Used internally by MarginLayoutParams. 5287 * @hide 5288 */ 5289 LayoutParams() { 5290 } 5291 5292 /** 5293 * Extracts the layout parameters from the supplied attributes. 5294 * 5295 * @param a the style attributes to extract the parameters from 5296 * @param widthAttr the identifier of the width attribute 5297 * @param heightAttr the identifier of the height attribute 5298 */ 5299 protected void setBaseAttributes(TypedArray a, int widthAttr, int heightAttr) { 5300 width = a.getLayoutDimension(widthAttr, "layout_width"); 5301 height = a.getLayoutDimension(heightAttr, "layout_height"); 5302 } 5303 5304 /** 5305 * Resolve layout parameters depending on the layout direction. Subclasses that care about 5306 * layoutDirection changes should override this method. The default implementation does 5307 * nothing. 5308 * 5309 * @param layoutDirection the direction of the layout 5310 * 5311 * {@link View#LAYOUT_DIRECTION_LTR} 5312 * {@link View#LAYOUT_DIRECTION_RTL} 5313 * 5314 * @hide 5315 */ 5316 protected void resolveWithDirection(int layoutDirection) { 5317 } 5318 5319 /** 5320 * Returns a String representation of this set of layout parameters. 5321 * 5322 * @param output the String to prepend to the internal representation 5323 * @return a String with the following format: output + 5324 * "ViewGroup.LayoutParams={ width=WIDTH, height=HEIGHT }" 5325 * 5326 * @hide 5327 */ 5328 public String debug(String output) { 5329 return output + "ViewGroup.LayoutParams={ width=" 5330 + sizeToString(width) + ", height=" + sizeToString(height) + " }"; 5331 } 5332 5333 /** 5334 * Converts the specified size to a readable String. 5335 * 5336 * @param size the size to convert 5337 * @return a String instance representing the supplied size 5338 * 5339 * @hide 5340 */ 5341 protected static String sizeToString(int size) { 5342 if (size == WRAP_CONTENT) { 5343 return "wrap-content"; 5344 } 5345 if (size == MATCH_PARENT) { 5346 return "match-parent"; 5347 } 5348 return String.valueOf(size); 5349 } 5350 } 5351 5352 /** 5353 * Per-child layout information for layouts that support margins. 5354 * See 5355 * {@link android.R.styleable#ViewGroup_MarginLayout ViewGroup Margin Layout Attributes} 5356 * for a list of all child view attributes that this class supports. 5357 */ 5358 public static class MarginLayoutParams extends ViewGroup.LayoutParams { 5359 /** 5360 * The left 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 leftMargin; 5365 5366 /** 5367 * The top 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 topMargin; 5372 5373 /** 5374 * The right 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 rightMargin; 5379 5380 /** 5381 * The bottom margin in pixels of the child. Whenever this value is changed, a call to 5382 * {@link android.view.View#requestLayout()} needs to be done. 5383 */ 5384 @ViewDebug.ExportedProperty(category = "layout") 5385 public int bottomMargin; 5386 5387 /** 5388 * The start margin in pixels of the child. 5389 * 5390 * @hide 5391 * 5392 */ 5393 @ViewDebug.ExportedProperty(category = "layout") 5394 protected int startMargin = DEFAULT_RELATIVE; 5395 5396 /** 5397 * The end margin in pixels of the child. 5398 * 5399 * @hide 5400 */ 5401 @ViewDebug.ExportedProperty(category = "layout") 5402 protected int endMargin = DEFAULT_RELATIVE; 5403 5404 /** 5405 * The default start and end margin. 5406 */ 5407 static private final int DEFAULT_RELATIVE = Integer.MIN_VALUE; 5408 5409 /** 5410 * Creates a new set of layout parameters. The values are extracted from 5411 * the supplied attributes set and context. 5412 * 5413 * @param c the application environment 5414 * @param attrs the set of attributes from which to extract the layout 5415 * parameters' values 5416 */ 5417 public MarginLayoutParams(Context c, AttributeSet attrs) { 5418 super(); 5419 5420 TypedArray a = c.obtainStyledAttributes(attrs, R.styleable.ViewGroup_MarginLayout); 5421 setBaseAttributes(a, 5422 R.styleable.ViewGroup_MarginLayout_layout_width, 5423 R.styleable.ViewGroup_MarginLayout_layout_height); 5424 5425 int margin = a.getDimensionPixelSize( 5426 com.android.internal.R.styleable.ViewGroup_MarginLayout_layout_margin, -1); 5427 if (margin >= 0) { 5428 leftMargin = margin; 5429 topMargin = margin; 5430 rightMargin= margin; 5431 bottomMargin = margin; 5432 } else { 5433 leftMargin = a.getDimensionPixelSize( 5434 R.styleable.ViewGroup_MarginLayout_layout_marginLeft, 0); 5435 topMargin = a.getDimensionPixelSize( 5436 R.styleable.ViewGroup_MarginLayout_layout_marginTop, 0); 5437 rightMargin = a.getDimensionPixelSize( 5438 R.styleable.ViewGroup_MarginLayout_layout_marginRight, 0); 5439 bottomMargin = a.getDimensionPixelSize( 5440 R.styleable.ViewGroup_MarginLayout_layout_marginBottom, 0); 5441 startMargin = a.getDimensionPixelSize( 5442 R.styleable.ViewGroup_MarginLayout_layout_marginStart, DEFAULT_RELATIVE); 5443 endMargin = a.getDimensionPixelSize( 5444 R.styleable.ViewGroup_MarginLayout_layout_marginEnd, DEFAULT_RELATIVE); 5445 } 5446 5447 a.recycle(); 5448 } 5449 5450 /** 5451 * {@inheritDoc} 5452 */ 5453 public MarginLayoutParams(int width, int height) { 5454 super(width, height); 5455 } 5456 5457 /** 5458 * Copy constructor. Clones the width, height and margin values of the source. 5459 * 5460 * @param source The layout params to copy from. 5461 */ 5462 public MarginLayoutParams(MarginLayoutParams source) { 5463 this.width = source.width; 5464 this.height = source.height; 5465 5466 this.leftMargin = source.leftMargin; 5467 this.topMargin = source.topMargin; 5468 this.rightMargin = source.rightMargin; 5469 this.bottomMargin = source.bottomMargin; 5470 this.startMargin = source.startMargin; 5471 this.endMargin = source.endMargin; 5472 } 5473 5474 /** 5475 * {@inheritDoc} 5476 */ 5477 public MarginLayoutParams(LayoutParams source) { 5478 super(source); 5479 } 5480 5481 /** 5482 * Sets the margins, in pixels. A call to {@link android.view.View#requestLayout()} needs 5483 * to be done so that the new margins are taken into account. Left and right margins may be 5484 * overriden by {@link android.view.View#requestLayout()} depending on layout direction. 5485 * 5486 * @param left the left margin size 5487 * @param top the top margin size 5488 * @param right the right margin size 5489 * @param bottom the bottom margin size 5490 * 5491 * @attr ref android.R.styleable#ViewGroup_MarginLayout_layout_marginLeft 5492 * @attr ref android.R.styleable#ViewGroup_MarginLayout_layout_marginTop 5493 * @attr ref android.R.styleable#ViewGroup_MarginLayout_layout_marginRight 5494 * @attr ref android.R.styleable#ViewGroup_MarginLayout_layout_marginBottom 5495 */ 5496 public void setMargins(int left, int top, int right, int bottom) { 5497 leftMargin = left; 5498 topMargin = top; 5499 rightMargin = right; 5500 bottomMargin = bottom; 5501 } 5502 5503 /** 5504 * Sets the relative margins, in pixels. A call to {@link android.view.View#requestLayout()} 5505 * needs to be done so that the new relative margins are taken into account. Left and right 5506 * margins may be overriden by {@link android.view.View#requestLayout()} depending on layout 5507 * direction. 5508 * 5509 * @param start the start margin size 5510 * @param top the top margin size 5511 * @param end the right margin size 5512 * @param bottom the bottom margin size 5513 * 5514 * @attr ref android.R.styleable#ViewGroup_MarginLayout_layout_marginStart 5515 * @attr ref android.R.styleable#ViewGroup_MarginLayout_layout_marginTop 5516 * @attr ref android.R.styleable#ViewGroup_MarginLayout_layout_marginEnd 5517 * @attr ref android.R.styleable#ViewGroup_MarginLayout_layout_marginBottom 5518 * 5519 * @hide 5520 */ 5521 public void setMarginsRelative(int start, int top, int end, int bottom) { 5522 startMargin = start; 5523 topMargin = top; 5524 endMargin = end; 5525 bottomMargin = bottom; 5526 } 5527 5528 /** 5529 * Returns the start margin in pixels. 5530 * 5531 * @attr ref android.R.styleable#ViewGroup_MarginLayout_layout_marginStart 5532 * 5533 * @return the start margin in pixels. 5534 * 5535 * @hide 5536 */ 5537 public int getMarginStart() { 5538 return startMargin; 5539 } 5540 5541 /** 5542 * Returns the end margin in pixels. 5543 * 5544 * @attr ref android.R.styleable#ViewGroup_MarginLayout_layout_marginEnd 5545 * 5546 * @return the end margin in pixels. 5547 * 5548 * @hide 5549 */ 5550 public int getMarginEnd() { 5551 return endMargin; 5552 } 5553 5554 /** 5555 * Check if margins are relative. 5556 * 5557 * @attr ref android.R.styleable#ViewGroup_MarginLayout_layout_marginStart 5558 * @attr ref android.R.styleable#ViewGroup_MarginLayout_layout_marginEnd 5559 * 5560 * @return true if either marginStart or marginEnd has been set 5561 * 5562 * @hide 5563 */ 5564 public boolean isMarginRelative() { 5565 return (startMargin != DEFAULT_RELATIVE) || (endMargin != DEFAULT_RELATIVE); 5566 } 5567 5568 /** 5569 * This will be called by {@link android.view.View#requestLayout()}. Left and Right margins 5570 * maybe overriden depending on layout direction. 5571 * 5572 * @hide 5573 */ 5574 @Override 5575 protected void resolveWithDirection(int layoutDirection) { 5576 switch(layoutDirection) { 5577 case View.LAYOUT_DIRECTION_RTL: 5578 leftMargin = (endMargin > DEFAULT_RELATIVE) ? endMargin : leftMargin; 5579 rightMargin = (startMargin > DEFAULT_RELATIVE) ? startMargin : rightMargin; 5580 break; 5581 case View.LAYOUT_DIRECTION_LTR: 5582 default: 5583 leftMargin = (startMargin > DEFAULT_RELATIVE) ? startMargin : leftMargin; 5584 rightMargin = (endMargin > DEFAULT_RELATIVE) ? endMargin : rightMargin; 5585 break; 5586 } 5587 } 5588 } 5589 5590 /* Describes a touched view and the ids of the pointers that it has captured. 5591 * 5592 * This code assumes that pointer ids are always in the range 0..31 such that 5593 * it can use a bitfield to track which pointer ids are present. 5594 * As it happens, the lower layers of the input dispatch pipeline also use the 5595 * same trick so the assumption should be safe here... 5596 */ 5597 private static final class TouchTarget { 5598 private static final int MAX_RECYCLED = 32; 5599 private static final Object sRecycleLock = new Object(); 5600 private static TouchTarget sRecycleBin; 5601 private static int sRecycledCount; 5602 5603 public static final int ALL_POINTER_IDS = -1; // all ones 5604 5605 // The touched child view. 5606 public View child; 5607 5608 // The combined bit mask of pointer ids for all pointers captured by the target. 5609 public int pointerIdBits; 5610 5611 // The next target in the target list. 5612 public TouchTarget next; 5613 5614 private TouchTarget() { 5615 } 5616 5617 public static TouchTarget obtain(View child, int pointerIdBits) { 5618 final TouchTarget target; 5619 synchronized (sRecycleLock) { 5620 if (sRecycleBin == null) { 5621 target = new TouchTarget(); 5622 } else { 5623 target = sRecycleBin; 5624 sRecycleBin = target.next; 5625 sRecycledCount--; 5626 target.next = null; 5627 } 5628 } 5629 target.child = child; 5630 target.pointerIdBits = pointerIdBits; 5631 return target; 5632 } 5633 5634 public void recycle() { 5635 synchronized (sRecycleLock) { 5636 if (sRecycledCount < MAX_RECYCLED) { 5637 next = sRecycleBin; 5638 sRecycleBin = this; 5639 sRecycledCount += 1; 5640 } else { 5641 next = null; 5642 } 5643 child = null; 5644 } 5645 } 5646 } 5647 5648 /* Describes a hovered view. */ 5649 private static final class HoverTarget { 5650 private static final int MAX_RECYCLED = 32; 5651 private static final Object sRecycleLock = new Object(); 5652 private static HoverTarget sRecycleBin; 5653 private static int sRecycledCount; 5654 5655 // The hovered child view. 5656 public View child; 5657 5658 // The next target in the target list. 5659 public HoverTarget next; 5660 5661 private HoverTarget() { 5662 } 5663 5664 public static HoverTarget obtain(View child) { 5665 final HoverTarget target; 5666 synchronized (sRecycleLock) { 5667 if (sRecycleBin == null) { 5668 target = new HoverTarget(); 5669 } else { 5670 target = sRecycleBin; 5671 sRecycleBin = target.next; 5672 sRecycledCount--; 5673 target.next = null; 5674 } 5675 } 5676 target.child = child; 5677 return target; 5678 } 5679 5680 public void recycle() { 5681 synchronized (sRecycleLock) { 5682 if (sRecycledCount < MAX_RECYCLED) { 5683 next = sRecycleBin; 5684 sRecycleBin = this; 5685 sRecycledCount += 1; 5686 } else { 5687 next = null; 5688 } 5689 child = null; 5690 } 5691 } 5692 } 5693} 5694