ViewGroup.java revision 33bbfd2232ea9eaae9a9d87a05a95a430f09bd83
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.animation.AlphaAnimation; 39import android.view.animation.Animation; 40import android.view.animation.AnimationUtils; 41import android.view.animation.LayoutAnimationController; 42import android.view.animation.Transformation; 43import com.android.internal.R; 44import com.android.internal.util.Predicate; 45 46import java.util.ArrayList; 47import java.util.HashSet; 48 49/** 50 * <p> 51 * A <code>ViewGroup</code> is a special view that can contain other views 52 * (called children.) The view group is the base class for layouts and views 53 * containers. This class also defines the 54 * {@link android.view.ViewGroup.LayoutParams} class which serves as the base 55 * class for layouts parameters. 56 * </p> 57 * 58 * <p> 59 * Also see {@link LayoutParams} for layout attributes. 60 * </p> 61 * 62 * @attr ref android.R.styleable#ViewGroup_clipChildren 63 * @attr ref android.R.styleable#ViewGroup_clipToPadding 64 * @attr ref android.R.styleable#ViewGroup_layoutAnimation 65 * @attr ref android.R.styleable#ViewGroup_animationCache 66 * @attr ref android.R.styleable#ViewGroup_persistentDrawingCache 67 * @attr ref android.R.styleable#ViewGroup_alwaysDrawnWithCache 68 * @attr ref android.R.styleable#ViewGroup_addStatesFromChildren 69 * @attr ref android.R.styleable#ViewGroup_descendantFocusability 70 * @attr ref android.R.styleable#ViewGroup_animateLayoutChanges 71 */ 72public abstract class ViewGroup extends View implements ViewParent, ViewManager { 73 74 private static final boolean DBG = false; 75 76 /** 77 * Views which have been hidden or removed which need to be animated on 78 * their way out. 79 * This field should be made private, so it is hidden from the SDK. 80 * {@hide} 81 */ 82 protected ArrayList<View> mDisappearingChildren; 83 84 /** 85 * Listener used to propagate events indicating when children are added 86 * and/or removed from a view group. 87 * This field should be made private, so it is hidden from the SDK. 88 * {@hide} 89 */ 90 protected OnHierarchyChangeListener mOnHierarchyChangeListener; 91 92 // The view contained within this ViewGroup that has or contains focus. 93 private View mFocused; 94 95 /** 96 * A Transformation used when drawing children, to 97 * apply on the child being drawn. 98 */ 99 private final Transformation mChildTransformation = new Transformation(); 100 101 /** 102 * Used to track the current invalidation region. 103 */ 104 private RectF mInvalidateRegion; 105 106 /** 107 * A Transformation used to calculate a correct 108 * invalidation area when the application is autoscaled. 109 */ 110 private Transformation mInvalidationTransformation; 111 112 // View currently under an ongoing drag 113 private View mCurrentDragView; 114 115 // Metadata about the ongoing drag 116 private DragEvent mCurrentDrag; 117 private HashSet<View> mDragNotifiedChildren; 118 119 // Does this group have a child that can accept the current drag payload? 120 private boolean mChildAcceptsDrag; 121 122 // Used during drag dispatch 123 private final PointF mLocalPoint = new PointF(); 124 125 // Layout animation 126 private LayoutAnimationController mLayoutAnimationController; 127 private Animation.AnimationListener mAnimationListener; 128 129 // First touch target in the linked list of touch targets. 130 private TouchTarget mFirstTouchTarget; 131 132 // Temporary arrays for splitting pointers. 133 private int[] mTmpPointerIndexMap; 134 private int[] mTmpPointerIds; 135 private MotionEvent.PointerCoords[] mTmpPointerCoords; 136 137 // For debugging only. You can see these in hierarchyviewer. 138 @SuppressWarnings({"FieldCanBeLocal", "UnusedDeclaration"}) 139 @ViewDebug.ExportedProperty(category = "events") 140 private long mLastTouchDownTime; 141 @ViewDebug.ExportedProperty(category = "events") 142 private int mLastTouchDownIndex = -1; 143 @SuppressWarnings({"FieldCanBeLocal", "UnusedDeclaration"}) 144 @ViewDebug.ExportedProperty(category = "events") 145 private float mLastTouchDownX; 146 @SuppressWarnings({"FieldCanBeLocal", "UnusedDeclaration"}) 147 @ViewDebug.ExportedProperty(category = "events") 148 private float mLastTouchDownY; 149 150 /** 151 * Internal flags. 152 * 153 * This field should be made private, so it is hidden from the SDK. 154 * {@hide} 155 */ 156 protected int mGroupFlags; 157 158 // When set, ViewGroup invalidates only the child's rectangle 159 // Set by default 160 private static final int FLAG_CLIP_CHILDREN = 0x1; 161 162 // When set, ViewGroup excludes the padding area from the invalidate rectangle 163 // Set by default 164 private static final int FLAG_CLIP_TO_PADDING = 0x2; 165 166 // When set, dispatchDraw() will invoke invalidate(); this is set by drawChild() when 167 // a child needs to be invalidated and FLAG_OPTIMIZE_INVALIDATE is set 168 private static final int FLAG_INVALIDATE_REQUIRED = 0x4; 169 170 // When set, dispatchDraw() will run the layout animation and unset the flag 171 private static final int FLAG_RUN_ANIMATION = 0x8; 172 173 // When set, there is either no layout animation on the ViewGroup or the layout 174 // animation is over 175 // Set by default 176 private static final int FLAG_ANIMATION_DONE = 0x10; 177 178 // If set, this ViewGroup has padding; if unset there is no padding and we don't need 179 // to clip it, even if FLAG_CLIP_TO_PADDING is set 180 private static final int FLAG_PADDING_NOT_NULL = 0x20; 181 182 // When set, this ViewGroup caches its children in a Bitmap before starting a layout animation 183 // Set by default 184 private static final int FLAG_ANIMATION_CACHE = 0x40; 185 186 // When set, this ViewGroup converts calls to invalidate(Rect) to invalidate() during a 187 // layout animation; this avoid clobbering the hierarchy 188 // Automatically set when the layout animation starts, depending on the animation's 189 // characteristics 190 private static final int FLAG_OPTIMIZE_INVALIDATE = 0x80; 191 192 // When set, the next call to drawChild() will clear mChildTransformation's matrix 193 private static final int FLAG_CLEAR_TRANSFORMATION = 0x100; 194 195 // When set, this ViewGroup invokes mAnimationListener.onAnimationEnd() and removes 196 // the children's Bitmap caches if necessary 197 // This flag is set when the layout animation is over (after FLAG_ANIMATION_DONE is set) 198 private static final int FLAG_NOTIFY_ANIMATION_LISTENER = 0x200; 199 200 /** 201 * When set, the drawing method will call {@link #getChildDrawingOrder(int, int)} 202 * to get the index of the child to draw for that iteration. 203 * 204 * @hide 205 */ 206 protected static final int FLAG_USE_CHILD_DRAWING_ORDER = 0x400; 207 208 /** 209 * When set, this ViewGroup supports static transformations on children; this causes 210 * {@link #getChildStaticTransformation(View, android.view.animation.Transformation)} to be 211 * invoked when a child is drawn. 212 * 213 * Any subclass overriding 214 * {@link #getChildStaticTransformation(View, android.view.animation.Transformation)} should 215 * set this flags in {@link #mGroupFlags}. 216 * 217 * {@hide} 218 */ 219 protected static final int FLAG_SUPPORT_STATIC_TRANSFORMATIONS = 0x800; 220 221 // When the previous drawChild() invocation used an alpha value that was lower than 222 // 1.0 and set it in mCachePaint 223 private static final int FLAG_ALPHA_LOWER_THAN_ONE = 0x1000; 224 225 /** 226 * When set, this ViewGroup's drawable states also include those 227 * of its children. 228 */ 229 private static final int FLAG_ADD_STATES_FROM_CHILDREN = 0x2000; 230 231 /** 232 * When set, this ViewGroup tries to always draw its children using their drawing cache. 233 */ 234 private static final int FLAG_ALWAYS_DRAWN_WITH_CACHE = 0x4000; 235 236 /** 237 * When set, and if FLAG_ALWAYS_DRAWN_WITH_CACHE is not set, this ViewGroup will try to 238 * draw its children with their drawing cache. 239 */ 240 private static final int FLAG_CHILDREN_DRAWN_WITH_CACHE = 0x8000; 241 242 /** 243 * When set, this group will go through its list of children to notify them of 244 * any drawable state change. 245 */ 246 private static final int FLAG_NOTIFY_CHILDREN_ON_DRAWABLE_STATE_CHANGE = 0x10000; 247 248 private static final int FLAG_MASK_FOCUSABILITY = 0x60000; 249 250 /** 251 * This view will get focus before any of its descendants. 252 */ 253 public static final int FOCUS_BEFORE_DESCENDANTS = 0x20000; 254 255 /** 256 * This view will get focus only if none of its descendants want it. 257 */ 258 public static final int FOCUS_AFTER_DESCENDANTS = 0x40000; 259 260 /** 261 * This view will block any of its descendants from getting focus, even 262 * if they are focusable. 263 */ 264 public static final int FOCUS_BLOCK_DESCENDANTS = 0x60000; 265 266 /** 267 * Used to map between enum in attrubutes and flag values. 268 */ 269 private static final int[] DESCENDANT_FOCUSABILITY_FLAGS = 270 {FOCUS_BEFORE_DESCENDANTS, FOCUS_AFTER_DESCENDANTS, 271 FOCUS_BLOCK_DESCENDANTS}; 272 273 /** 274 * When set, this ViewGroup should not intercept touch events. 275 * {@hide} 276 */ 277 protected static final int FLAG_DISALLOW_INTERCEPT = 0x80000; 278 279 /** 280 * When set, this ViewGroup will split MotionEvents to multiple child Views when appropriate. 281 */ 282 private static final int FLAG_SPLIT_MOTION_EVENTS = 0x200000; 283 284 /** 285 * Indicates which types of drawing caches are to be kept in memory. 286 * This field should be made private, so it is hidden from the SDK. 287 * {@hide} 288 */ 289 protected int mPersistentDrawingCache; 290 291 /** 292 * Used to indicate that no drawing cache should be kept in memory. 293 */ 294 public static final int PERSISTENT_NO_CACHE = 0x0; 295 296 /** 297 * Used to indicate that the animation drawing cache should be kept in memory. 298 */ 299 public static final int PERSISTENT_ANIMATION_CACHE = 0x1; 300 301 /** 302 * Used to indicate that the scrolling drawing cache should be kept in memory. 303 */ 304 public static final int PERSISTENT_SCROLLING_CACHE = 0x2; 305 306 /** 307 * Used to indicate that all drawing caches should be kept in memory. 308 */ 309 public static final int PERSISTENT_ALL_CACHES = 0x3; 310 311 /** 312 * We clip to padding when FLAG_CLIP_TO_PADDING and FLAG_PADDING_NOT_NULL 313 * are set at the same time. 314 */ 315 protected static final int CLIP_TO_PADDING_MASK = FLAG_CLIP_TO_PADDING | FLAG_PADDING_NOT_NULL; 316 317 // Index of the child's left position in the mLocation array 318 private static final int CHILD_LEFT_INDEX = 0; 319 // Index of the child's top position in the mLocation array 320 private static final int CHILD_TOP_INDEX = 1; 321 322 // Child views of this ViewGroup 323 private View[] mChildren; 324 // Number of valid children in the mChildren array, the rest should be null or not 325 // considered as children 326 327 private boolean mLayoutSuppressed = false; 328 329 private int mChildrenCount; 330 331 private static final int ARRAY_INITIAL_CAPACITY = 12; 332 private static final int ARRAY_CAPACITY_INCREMENT = 12; 333 334 // Used to draw cached views 335 private final Paint mCachePaint = new Paint(); 336 337 // Used to animate add/remove changes in layout 338 private LayoutTransition mTransition; 339 340 // The set of views that are currently being transitioned. This list is used to track views 341 // being removed that should not actually be removed from the parent yet because they are 342 // being animated. 343 private ArrayList<View> mTransitioningViews; 344 345 // List of children changing visibility. This is used to potentially keep rendering 346 // views during a transition when they otherwise would have become gone/invisible 347 private ArrayList<View> mVisibilityChangingChildren; 348 349 // Indicates whether this container will use its children layers to draw 350 @ViewDebug.ExportedProperty(category = "drawing") 351 private boolean mDrawLayers = true; 352 353 public ViewGroup(Context context) { 354 super(context); 355 initViewGroup(); 356 } 357 358 public ViewGroup(Context context, AttributeSet attrs) { 359 super(context, attrs); 360 initViewGroup(); 361 initFromAttributes(context, attrs); 362 } 363 364 public ViewGroup(Context context, AttributeSet attrs, int defStyle) { 365 super(context, attrs, defStyle); 366 initViewGroup(); 367 initFromAttributes(context, attrs); 368 } 369 370 private void initViewGroup() { 371 // ViewGroup doesn't draw by default 372 setFlags(WILL_NOT_DRAW, DRAW_MASK); 373 mGroupFlags |= FLAG_CLIP_CHILDREN; 374 mGroupFlags |= FLAG_CLIP_TO_PADDING; 375 mGroupFlags |= FLAG_ANIMATION_DONE; 376 mGroupFlags |= FLAG_ANIMATION_CACHE; 377 mGroupFlags |= FLAG_ALWAYS_DRAWN_WITH_CACHE; 378 379 if (mContext.getApplicationInfo().targetSdkVersion >= Build.VERSION_CODES.HONEYCOMB) { 380 mGroupFlags |= FLAG_SPLIT_MOTION_EVENTS; 381 } 382 383 setDescendantFocusability(FOCUS_BEFORE_DESCENDANTS); 384 385 mChildren = new View[ARRAY_INITIAL_CAPACITY]; 386 mChildrenCount = 0; 387 388 mCachePaint.setDither(false); 389 390 mPersistentDrawingCache = PERSISTENT_SCROLLING_CACHE; 391 } 392 393 private void initFromAttributes(Context context, AttributeSet attrs) { 394 TypedArray a = context.obtainStyledAttributes(attrs, 395 R.styleable.ViewGroup); 396 397 final int N = a.getIndexCount(); 398 for (int i = 0; i < N; i++) { 399 int attr = a.getIndex(i); 400 switch (attr) { 401 case R.styleable.ViewGroup_clipChildren: 402 setClipChildren(a.getBoolean(attr, true)); 403 break; 404 case R.styleable.ViewGroup_clipToPadding: 405 setClipToPadding(a.getBoolean(attr, true)); 406 break; 407 case R.styleable.ViewGroup_animationCache: 408 setAnimationCacheEnabled(a.getBoolean(attr, true)); 409 break; 410 case R.styleable.ViewGroup_persistentDrawingCache: 411 setPersistentDrawingCache(a.getInt(attr, PERSISTENT_SCROLLING_CACHE)); 412 break; 413 case R.styleable.ViewGroup_addStatesFromChildren: 414 setAddStatesFromChildren(a.getBoolean(attr, false)); 415 break; 416 case R.styleable.ViewGroup_alwaysDrawnWithCache: 417 setAlwaysDrawnWithCacheEnabled(a.getBoolean(attr, true)); 418 break; 419 case R.styleable.ViewGroup_layoutAnimation: 420 int id = a.getResourceId(attr, -1); 421 if (id > 0) { 422 setLayoutAnimation(AnimationUtils.loadLayoutAnimation(mContext, id)); 423 } 424 break; 425 case R.styleable.ViewGroup_descendantFocusability: 426 setDescendantFocusability(DESCENDANT_FOCUSABILITY_FLAGS[a.getInt(attr, 0)]); 427 break; 428 case R.styleable.ViewGroup_splitMotionEvents: 429 setMotionEventSplittingEnabled(a.getBoolean(attr, false)); 430 break; 431 case R.styleable.ViewGroup_animateLayoutChanges: 432 boolean animateLayoutChanges = a.getBoolean(attr, false); 433 if (animateLayoutChanges) { 434 setLayoutTransition(new LayoutTransition()); 435 } 436 break; 437 } 438 } 439 440 a.recycle(); 441 } 442 443 /** 444 * Gets the descendant focusability of this view group. The descendant 445 * focusability defines the relationship between this view group and its 446 * descendants when looking for a view to take focus in 447 * {@link #requestFocus(int, android.graphics.Rect)}. 448 * 449 * @return one of {@link #FOCUS_BEFORE_DESCENDANTS}, {@link #FOCUS_AFTER_DESCENDANTS}, 450 * {@link #FOCUS_BLOCK_DESCENDANTS}. 451 */ 452 @ViewDebug.ExportedProperty(category = "focus", mapping = { 453 @ViewDebug.IntToString(from = FOCUS_BEFORE_DESCENDANTS, to = "FOCUS_BEFORE_DESCENDANTS"), 454 @ViewDebug.IntToString(from = FOCUS_AFTER_DESCENDANTS, to = "FOCUS_AFTER_DESCENDANTS"), 455 @ViewDebug.IntToString(from = FOCUS_BLOCK_DESCENDANTS, to = "FOCUS_BLOCK_DESCENDANTS") 456 }) 457 public int getDescendantFocusability() { 458 return mGroupFlags & FLAG_MASK_FOCUSABILITY; 459 } 460 461 /** 462 * Set the descendant focusability of this view group. This defines the relationship 463 * between this view group and its descendants when looking for a view to 464 * take focus in {@link #requestFocus(int, android.graphics.Rect)}. 465 * 466 * @param focusability one of {@link #FOCUS_BEFORE_DESCENDANTS}, {@link #FOCUS_AFTER_DESCENDANTS}, 467 * {@link #FOCUS_BLOCK_DESCENDANTS}. 468 */ 469 public void setDescendantFocusability(int focusability) { 470 switch (focusability) { 471 case FOCUS_BEFORE_DESCENDANTS: 472 case FOCUS_AFTER_DESCENDANTS: 473 case FOCUS_BLOCK_DESCENDANTS: 474 break; 475 default: 476 throw new IllegalArgumentException("must be one of FOCUS_BEFORE_DESCENDANTS, " 477 + "FOCUS_AFTER_DESCENDANTS, FOCUS_BLOCK_DESCENDANTS"); 478 } 479 mGroupFlags &= ~FLAG_MASK_FOCUSABILITY; 480 mGroupFlags |= (focusability & FLAG_MASK_FOCUSABILITY); 481 } 482 483 /** 484 * {@inheritDoc} 485 */ 486 @Override 487 void handleFocusGainInternal(int direction, Rect previouslyFocusedRect) { 488 if (mFocused != null) { 489 mFocused.unFocus(); 490 mFocused = null; 491 } 492 super.handleFocusGainInternal(direction, previouslyFocusedRect); 493 } 494 495 /** 496 * {@inheritDoc} 497 */ 498 public void requestChildFocus(View child, View focused) { 499 if (DBG) { 500 System.out.println(this + " requestChildFocus()"); 501 } 502 if (getDescendantFocusability() == FOCUS_BLOCK_DESCENDANTS) { 503 return; 504 } 505 506 // Unfocus us, if necessary 507 super.unFocus(); 508 509 // We had a previous notion of who had focus. Clear it. 510 if (mFocused != child) { 511 if (mFocused != null) { 512 mFocused.unFocus(); 513 } 514 515 mFocused = child; 516 } 517 if (mParent != null) { 518 mParent.requestChildFocus(this, focused); 519 } 520 } 521 522 /** 523 * {@inheritDoc} 524 */ 525 public void focusableViewAvailable(View v) { 526 if (mParent != null 527 // shortcut: don't report a new focusable view if we block our descendants from 528 // getting focus 529 && (getDescendantFocusability() != FOCUS_BLOCK_DESCENDANTS) 530 // shortcut: don't report a new focusable view if we already are focused 531 // (and we don't prefer our descendants) 532 // 533 // note: knowing that mFocused is non-null is not a good enough reason 534 // to break the traversal since in that case we'd actually have to find 535 // the focused view and make sure it wasn't FOCUS_AFTER_DESCENDANTS and 536 // an ancestor of v; this will get checked for at ViewRoot 537 && !(isFocused() && getDescendantFocusability() != FOCUS_AFTER_DESCENDANTS)) { 538 mParent.focusableViewAvailable(v); 539 } 540 } 541 542 /** 543 * {@inheritDoc} 544 */ 545 public boolean showContextMenuForChild(View originalView) { 546 return mParent != null && mParent.showContextMenuForChild(originalView); 547 } 548 549 /** 550 * {@inheritDoc} 551 */ 552 public ActionMode startActionModeForChild(View originalView, ActionMode.Callback callback) { 553 return mParent != null ? mParent.startActionModeForChild(originalView, callback) : null; 554 } 555 556 /** 557 * Find the nearest view in the specified direction that wants to take 558 * focus. 559 * 560 * @param focused The view that currently has focus 561 * @param direction One of FOCUS_UP, FOCUS_DOWN, FOCUS_LEFT, and 562 * FOCUS_RIGHT, or 0 for not applicable. 563 */ 564 public View focusSearch(View focused, int direction) { 565 if (isRootNamespace()) { 566 // root namespace means we should consider ourselves the top of the 567 // tree for focus searching; otherwise we could be focus searching 568 // into other tabs. see LocalActivityManager and TabHost for more info 569 return FocusFinder.getInstance().findNextFocus(this, focused, direction); 570 } else if (mParent != null) { 571 return mParent.focusSearch(focused, direction); 572 } 573 return null; 574 } 575 576 /** 577 * {@inheritDoc} 578 */ 579 public boolean requestChildRectangleOnScreen(View child, Rect rectangle, boolean immediate) { 580 return false; 581 } 582 583 /** 584 * {@inheritDoc} 585 */ 586 @Override 587 public boolean dispatchUnhandledMove(View focused, int direction) { 588 return mFocused != null && 589 mFocused.dispatchUnhandledMove(focused, direction); 590 } 591 592 /** 593 * {@inheritDoc} 594 */ 595 public void clearChildFocus(View child) { 596 if (DBG) { 597 System.out.println(this + " clearChildFocus()"); 598 } 599 600 mFocused = null; 601 if (mParent != null) { 602 mParent.clearChildFocus(this); 603 } 604 } 605 606 /** 607 * {@inheritDoc} 608 */ 609 @Override 610 public void clearFocus() { 611 super.clearFocus(); 612 613 // clear any child focus if it exists 614 if (mFocused != null) { 615 mFocused.clearFocus(); 616 } 617 } 618 619 /** 620 * {@inheritDoc} 621 */ 622 @Override 623 void unFocus() { 624 if (DBG) { 625 System.out.println(this + " unFocus()"); 626 } 627 628 super.unFocus(); 629 if (mFocused != null) { 630 mFocused.unFocus(); 631 } 632 mFocused = null; 633 } 634 635 /** 636 * Returns the focused child of this view, if any. The child may have focus 637 * or contain focus. 638 * 639 * @return the focused child or null. 640 */ 641 public View getFocusedChild() { 642 return mFocused; 643 } 644 645 /** 646 * Returns true if this view has or contains focus 647 * 648 * @return true if this view has or contains focus 649 */ 650 @Override 651 public boolean hasFocus() { 652 return (mPrivateFlags & FOCUSED) != 0 || mFocused != null; 653 } 654 655 /* 656 * (non-Javadoc) 657 * 658 * @see android.view.View#findFocus() 659 */ 660 @Override 661 public View findFocus() { 662 if (DBG) { 663 System.out.println("Find focus in " + this + ": flags=" 664 + isFocused() + ", child=" + mFocused); 665 } 666 667 if (isFocused()) { 668 return this; 669 } 670 671 if (mFocused != null) { 672 return mFocused.findFocus(); 673 } 674 return null; 675 } 676 677 /** 678 * {@inheritDoc} 679 */ 680 @Override 681 public boolean hasFocusable() { 682 if ((mViewFlags & VISIBILITY_MASK) != VISIBLE) { 683 return false; 684 } 685 686 if (isFocusable()) { 687 return true; 688 } 689 690 final int descendantFocusability = getDescendantFocusability(); 691 if (descendantFocusability != FOCUS_BLOCK_DESCENDANTS) { 692 final int count = mChildrenCount; 693 final View[] children = mChildren; 694 695 for (int i = 0; i < count; i++) { 696 final View child = children[i]; 697 if (child.hasFocusable()) { 698 return true; 699 } 700 } 701 } 702 703 return false; 704 } 705 706 /** 707 * {@inheritDoc} 708 */ 709 @Override 710 public void addFocusables(ArrayList<View> views, int direction) { 711 addFocusables(views, direction, FOCUSABLES_TOUCH_MODE); 712 } 713 714 /** 715 * {@inheritDoc} 716 */ 717 @Override 718 public void addFocusables(ArrayList<View> views, int direction, int focusableMode) { 719 final int focusableCount = views.size(); 720 721 final int descendantFocusability = getDescendantFocusability(); 722 723 if (descendantFocusability != FOCUS_BLOCK_DESCENDANTS) { 724 final int count = mChildrenCount; 725 final View[] children = mChildren; 726 727 for (int i = 0; i < count; i++) { 728 final View child = children[i]; 729 if ((child.mViewFlags & VISIBILITY_MASK) == VISIBLE) { 730 child.addFocusables(views, direction, focusableMode); 731 } 732 } 733 } 734 735 // we add ourselves (if focusable) in all cases except for when we are 736 // FOCUS_AFTER_DESCENDANTS and there are some descendants focusable. this is 737 // to avoid the focus search finding layouts when a more precise search 738 // among the focusable children would be more interesting. 739 if ( 740 descendantFocusability != FOCUS_AFTER_DESCENDANTS || 741 // No focusable descendants 742 (focusableCount == views.size())) { 743 super.addFocusables(views, direction, focusableMode); 744 } 745 } 746 747 /** 748 * {@inheritDoc} 749 */ 750 @Override 751 public void dispatchWindowFocusChanged(boolean hasFocus) { 752 super.dispatchWindowFocusChanged(hasFocus); 753 final int count = mChildrenCount; 754 final View[] children = mChildren; 755 for (int i = 0; i < count; i++) { 756 children[i].dispatchWindowFocusChanged(hasFocus); 757 } 758 } 759 760 /** 761 * {@inheritDoc} 762 */ 763 @Override 764 public void addTouchables(ArrayList<View> views) { 765 super.addTouchables(views); 766 767 final int count = mChildrenCount; 768 final View[] children = mChildren; 769 770 for (int i = 0; i < count; i++) { 771 final View child = children[i]; 772 if ((child.mViewFlags & VISIBILITY_MASK) == VISIBLE) { 773 child.addTouchables(views); 774 } 775 } 776 } 777 778 /** 779 * {@inheritDoc} 780 */ 781 @Override 782 public void dispatchDisplayHint(int hint) { 783 super.dispatchDisplayHint(hint); 784 final int count = mChildrenCount; 785 final View[] children = mChildren; 786 for (int i = 0; i < count; i++) { 787 children[i].dispatchDisplayHint(hint); 788 } 789 } 790 791 /** 792 * @hide 793 * @param child 794 * @param visibility 795 */ 796 void onChildVisibilityChanged(View child, int visibility) { 797 if (mTransition != null) { 798 if (visibility == VISIBLE) { 799 mTransition.showChild(this, child); 800 } else { 801 mTransition.hideChild(this, child); 802 } 803 if (visibility != VISIBLE) { 804 // Only track this on disappearing views - appearing views are already visible 805 // and don't need special handling during drawChild() 806 if (mVisibilityChangingChildren == null) { 807 mVisibilityChangingChildren = new ArrayList<View>(); 808 } 809 mVisibilityChangingChildren.add(child); 810 if (mTransitioningViews != null && mTransitioningViews.contains(child)) { 811 addDisappearingView(child); 812 } 813 } 814 } 815 816 // in all cases, for drags 817 if (mCurrentDrag != null) { 818 if (visibility == VISIBLE) { 819 notifyChildOfDrag(child); 820 } 821 } 822 } 823 824 /** 825 * {@inheritDoc} 826 */ 827 @Override 828 protected void dispatchVisibilityChanged(View changedView, int visibility) { 829 super.dispatchVisibilityChanged(changedView, visibility); 830 final int count = mChildrenCount; 831 final View[] children = mChildren; 832 for (int i = 0; i < count; i++) { 833 children[i].dispatchVisibilityChanged(changedView, visibility); 834 } 835 } 836 837 /** 838 * {@inheritDoc} 839 */ 840 @Override 841 public void dispatchWindowVisibilityChanged(int visibility) { 842 super.dispatchWindowVisibilityChanged(visibility); 843 final int count = mChildrenCount; 844 final View[] children = mChildren; 845 for (int i = 0; i < count; i++) { 846 children[i].dispatchWindowVisibilityChanged(visibility); 847 } 848 } 849 850 /** 851 * {@inheritDoc} 852 */ 853 @Override 854 public void dispatchConfigurationChanged(Configuration newConfig) { 855 super.dispatchConfigurationChanged(newConfig); 856 final int count = mChildrenCount; 857 final View[] children = mChildren; 858 for (int i = 0; i < count; i++) { 859 children[i].dispatchConfigurationChanged(newConfig); 860 } 861 } 862 863 /** 864 * {@inheritDoc} 865 */ 866 public void recomputeViewAttributes(View child) { 867 if (mAttachInfo != null && !mAttachInfo.mRecomputeGlobalAttributes) { 868 ViewParent parent = mParent; 869 if (parent != null) parent.recomputeViewAttributes(this); 870 } 871 } 872 873 @Override 874 void dispatchCollectViewAttributes(int visibility) { 875 visibility |= mViewFlags&VISIBILITY_MASK; 876 super.dispatchCollectViewAttributes(visibility); 877 final int count = mChildrenCount; 878 final View[] children = mChildren; 879 for (int i = 0; i < count; i++) { 880 children[i].dispatchCollectViewAttributes(visibility); 881 } 882 } 883 884 /** 885 * {@inheritDoc} 886 */ 887 public void bringChildToFront(View child) { 888 int index = indexOfChild(child); 889 if (index >= 0) { 890 removeFromArray(index); 891 addInArray(child, mChildrenCount); 892 child.mParent = this; 893 } 894 } 895 896 /** 897 * {@inheritDoc} 898 * 899 * !!! TODO: write real docs 900 */ 901 @Override 902 public boolean dispatchDragEvent(DragEvent event) { 903 boolean retval = false; 904 final float tx = event.mX; 905 final float ty = event.mY; 906 907 ViewRoot root = getViewRoot(); 908 909 // Dispatch down the view hierarchy 910 switch (event.mAction) { 911 case DragEvent.ACTION_DRAG_STARTED: { 912 // clear state to recalculate which views we drag over 913 mCurrentDragView = null; 914 915 // Set up our tracking of drag-started notifications 916 mCurrentDrag = DragEvent.obtain(event); 917 if (mDragNotifiedChildren == null) { 918 mDragNotifiedChildren = new HashSet<View>(); 919 } else { 920 mDragNotifiedChildren.clear(); 921 } 922 923 // Now dispatch down to our children, caching the responses 924 mChildAcceptsDrag = false; 925 final int count = mChildrenCount; 926 final View[] children = mChildren; 927 for (int i = 0; i < count; i++) { 928 final View child = children[i]; 929 if (child.getVisibility() == VISIBLE) { 930 final boolean handled = notifyChildOfDrag(children[i]); 931 if (handled) { 932 mChildAcceptsDrag = true; 933 } 934 } 935 } 936 937 // Return HANDLED if one of our children can accept the drag 938 if (mChildAcceptsDrag) { 939 retval = true; 940 } 941 } break; 942 943 case DragEvent.ACTION_DRAG_ENDED: { 944 // Release the bookkeeping now that the drag lifecycle has ended 945 if (mDragNotifiedChildren != null) { 946 for (View child : mDragNotifiedChildren) { 947 // If a child was notified about an ongoing drag, it's told that it's over 948 child.dispatchDragEvent(event); 949 } 950 951 mDragNotifiedChildren.clear(); 952 mCurrentDrag.recycle(); 953 mCurrentDrag = null; 954 } 955 956 // We consider drag-ended to have been handled if one of our children 957 // had offered to handle the drag. 958 if (mChildAcceptsDrag) { 959 retval = true; 960 } 961 } break; 962 963 case DragEvent.ACTION_DRAG_LOCATION: { 964 // Find the [possibly new] drag target 965 final View target = findFrontmostDroppableChildAt(event.mX, event.mY, mLocalPoint); 966 967 // If we've changed apparent drag target, tell the view root which view 968 // we're over now [for purposes of the eventual drag-recipient-changed 969 // notifications to the framework] and tell the new target that the drag 970 // has entered its bounds. The root will see setDragFocus() calls all 971 // the way down to the final leaf view that is handling the LOCATION event 972 // before reporting the new potential recipient to the framework. 973 if (mCurrentDragView != target) { 974 root.setDragFocus(target); 975 976 final int action = event.mAction; 977 // If we've dragged off of a child view, send it the EXITED message 978 if (mCurrentDragView != null) { 979 event.mAction = DragEvent.ACTION_DRAG_EXITED; 980 mCurrentDragView.dispatchDragEvent(event); 981 } 982 mCurrentDragView = target; 983 984 // If we've dragged over a new child view, send it the ENTERED message 985 if (target != null) { 986 event.mAction = DragEvent.ACTION_DRAG_ENTERED; 987 target.dispatchDragEvent(event); 988 } 989 event.mAction = action; // restore the event's original state 990 } 991 992 // Dispatch the actual drag location notice, localized into its coordinates 993 if (target != null) { 994 event.mX = mLocalPoint.x; 995 event.mY = mLocalPoint.y; 996 997 retval = target.dispatchDragEvent(event); 998 999 event.mX = tx; 1000 event.mY = ty; 1001 } 1002 } break; 1003 1004 /* Entered / exited dispatch 1005 * 1006 * DRAG_ENTERED is not dispatched downwards from ViewGroup. The reason for this is 1007 * that we're about to get the corresponding LOCATION event, which we will use to 1008 * determine which of our children is the new target; at that point we will 1009 * push a DRAG_ENTERED down to the new target child [which may itself be a ViewGroup]. 1010 * 1011 * DRAG_EXITED *is* dispatched all the way down immediately: once we know the 1012 * drag has left this ViewGroup, we know by definition that every contained subview 1013 * is also no longer under the drag point. 1014 */ 1015 1016 case DragEvent.ACTION_DRAG_EXITED: { 1017 if (mCurrentDragView != null) { 1018 mCurrentDragView.dispatchDragEvent(event); 1019 mCurrentDragView = null; 1020 } 1021 } break; 1022 1023 case DragEvent.ACTION_DROP: { 1024 if (ViewDebug.DEBUG_DRAG) Log.d(View.VIEW_LOG_TAG, "Drop event: " + event); 1025 View target = findFrontmostDroppableChildAt(event.mX, event.mY, mLocalPoint); 1026 if (target != null) { 1027 if (ViewDebug.DEBUG_DRAG) Log.d(View.VIEW_LOG_TAG, " dispatch drop to " + target); 1028 event.mX = mLocalPoint.x; 1029 event.mY = mLocalPoint.y; 1030 retval = target.dispatchDragEvent(event); 1031 event.mX = tx; 1032 event.mY = ty; 1033 } else { 1034 if (ViewDebug.DEBUG_DRAG) { 1035 Log.d(View.VIEW_LOG_TAG, " not dropped on an accepting view"); 1036 } 1037 } 1038 } break; 1039 } 1040 1041 // If none of our children could handle the event, try here 1042 if (!retval) { 1043 // Call up to the View implementation that dispatches to installed listeners 1044 retval = super.dispatchDragEvent(event); 1045 } 1046 return retval; 1047 } 1048 1049 // Find the frontmost child view that lies under the given point, and calculate 1050 // the position within its own local coordinate system. 1051 View findFrontmostDroppableChildAt(float x, float y, PointF outLocalPoint) { 1052 final int count = mChildrenCount; 1053 final View[] children = mChildren; 1054 for (int i = count - 1; i >= 0; i--) { 1055 final View child = children[i]; 1056 if (!child.mCanAcceptDrop) { 1057 continue; 1058 } 1059 1060 if (isTransformedTouchPointInView(x, y, child, outLocalPoint)) { 1061 return child; 1062 } 1063 } 1064 return null; 1065 } 1066 1067 boolean notifyChildOfDrag(View child) { 1068 if (ViewDebug.DEBUG_DRAG) { 1069 Log.d(View.VIEW_LOG_TAG, "Sending drag-started to view: " + child); 1070 } 1071 1072 if (! mDragNotifiedChildren.contains(child)) { 1073 mDragNotifiedChildren.add(child); 1074 child.mCanAcceptDrop = child.dispatchDragEvent(mCurrentDrag); 1075 } 1076 return child.mCanAcceptDrop; 1077 } 1078 1079 @Override 1080 public void dispatchSystemUiVisibilityChanged(int visible) { 1081 super.dispatchSystemUiVisibilityChanged(visible); 1082 1083 final int count = mChildrenCount; 1084 final View[] children = mChildren; 1085 for (int i=0; i <count; i++) { 1086 final View child = children[i]; 1087 child.dispatchSystemUiVisibilityChanged(visible); 1088 } 1089 } 1090 1091 /** 1092 * {@inheritDoc} 1093 */ 1094 @Override 1095 public boolean dispatchKeyEventPreIme(KeyEvent event) { 1096 if ((mPrivateFlags & (FOCUSED | HAS_BOUNDS)) == (FOCUSED | HAS_BOUNDS)) { 1097 return super.dispatchKeyEventPreIme(event); 1098 } else if (mFocused != null && (mFocused.mPrivateFlags & HAS_BOUNDS) == HAS_BOUNDS) { 1099 return mFocused.dispatchKeyEventPreIme(event); 1100 } 1101 return false; 1102 } 1103 1104 /** 1105 * {@inheritDoc} 1106 */ 1107 @Override 1108 public boolean dispatchKeyEvent(KeyEvent event) { 1109 if ((mPrivateFlags & (FOCUSED | HAS_BOUNDS)) == (FOCUSED | HAS_BOUNDS)) { 1110 return super.dispatchKeyEvent(event); 1111 } else if (mFocused != null && (mFocused.mPrivateFlags & HAS_BOUNDS) == HAS_BOUNDS) { 1112 return mFocused.dispatchKeyEvent(event); 1113 } 1114 return false; 1115 } 1116 1117 /** 1118 * {@inheritDoc} 1119 */ 1120 @Override 1121 public boolean dispatchKeyShortcutEvent(KeyEvent event) { 1122 if ((mPrivateFlags & (FOCUSED | HAS_BOUNDS)) == (FOCUSED | HAS_BOUNDS)) { 1123 return super.dispatchKeyShortcutEvent(event); 1124 } else if (mFocused != null && (mFocused.mPrivateFlags & HAS_BOUNDS) == HAS_BOUNDS) { 1125 return mFocused.dispatchKeyShortcutEvent(event); 1126 } 1127 return false; 1128 } 1129 1130 /** 1131 * {@inheritDoc} 1132 */ 1133 @Override 1134 public boolean dispatchTrackballEvent(MotionEvent event) { 1135 if ((mPrivateFlags & (FOCUSED | HAS_BOUNDS)) == (FOCUSED | HAS_BOUNDS)) { 1136 return super.dispatchTrackballEvent(event); 1137 } else if (mFocused != null && (mFocused.mPrivateFlags & HAS_BOUNDS) == HAS_BOUNDS) { 1138 return mFocused.dispatchTrackballEvent(event); 1139 } 1140 return false; 1141 } 1142 1143 /** 1144 * {@inheritDoc} 1145 */ 1146 @Override 1147 public boolean dispatchGenericMotionEvent(MotionEvent event) { 1148 if ((event.getSource() & InputDevice.SOURCE_CLASS_POINTER) != 0) { 1149 // Send the event to the child under the pointer. 1150 final int childrenCount = mChildrenCount; 1151 if (childrenCount != 0) { 1152 final View[] children = mChildren; 1153 final float x = event.getX(); 1154 final float y = event.getY(); 1155 1156 for (int i = childrenCount - 1; i >= 0; i--) { 1157 final View child = children[i]; 1158 if ((child.mViewFlags & VISIBILITY_MASK) != VISIBLE 1159 && child.getAnimation() == null) { 1160 // Skip invisible child unless it is animating. 1161 continue; 1162 } 1163 1164 if (!isTransformedTouchPointInView(x, y, child, null)) { 1165 // Scroll point is out of child's bounds. 1166 continue; 1167 } 1168 1169 final float offsetX = mScrollX - child.mLeft; 1170 final float offsetY = mScrollY - child.mTop; 1171 final boolean handled; 1172 if (!child.hasIdentityMatrix()) { 1173 MotionEvent transformedEvent = MotionEvent.obtain(event); 1174 transformedEvent.offsetLocation(offsetX, offsetY); 1175 transformedEvent.transform(child.getInverseMatrix()); 1176 handled = child.dispatchGenericMotionEvent(transformedEvent); 1177 transformedEvent.recycle(); 1178 } else { 1179 event.offsetLocation(offsetX, offsetY); 1180 handled = child.dispatchGenericMotionEvent(event); 1181 event.offsetLocation(-offsetX, -offsetY); 1182 } 1183 1184 if (handled) { 1185 return true; 1186 } 1187 } 1188 } 1189 1190 // No child handled the event. Send it to this view group. 1191 return super.dispatchGenericMotionEvent(event); 1192 } 1193 1194 // Send the event to the focused child or to this view group if it has focus. 1195 if ((mPrivateFlags & (FOCUSED | HAS_BOUNDS)) == (FOCUSED | HAS_BOUNDS)) { 1196 return super.dispatchGenericMotionEvent(event); 1197 } else if (mFocused != null && (mFocused.mPrivateFlags & HAS_BOUNDS) == HAS_BOUNDS) { 1198 return mFocused.dispatchGenericMotionEvent(event); 1199 } 1200 return false; 1201 } 1202 1203 /** 1204 * {@inheritDoc} 1205 */ 1206 @Override 1207 public boolean dispatchTouchEvent(MotionEvent ev) { 1208 if (!onFilterTouchEventForSecurity(ev)) { 1209 return false; 1210 } 1211 1212 final int action = ev.getAction(); 1213 final int actionMasked = action & MotionEvent.ACTION_MASK; 1214 1215 // Handle an initial down. 1216 if (actionMasked == MotionEvent.ACTION_DOWN 1217 || actionMasked == MotionEvent.ACTION_HOVER_MOVE) { 1218 // Throw away all previous state when starting a new touch gesture. 1219 // The framework may have dropped the up or cancel event for the previous gesture 1220 // due to an app switch, ANR, or some other state change. 1221 cancelAndClearTouchTargets(ev); 1222 resetTouchState(); 1223 } 1224 1225 // Check for interception. 1226 final boolean intercepted; 1227 if (actionMasked == MotionEvent.ACTION_DOWN 1228 || mFirstTouchTarget != null) { 1229 final boolean disallowIntercept = (mGroupFlags & FLAG_DISALLOW_INTERCEPT) != 0; 1230 if (!disallowIntercept) { 1231 intercepted = onInterceptTouchEvent(ev); 1232 ev.setAction(action); // restore action in case onInterceptTouchEvent() changed it 1233 } else { 1234 intercepted = false; 1235 } 1236 } else { 1237 // There are no touch targets and this action is not an initial down 1238 // so this view group continues to intercept touches. 1239 intercepted = true; 1240 } 1241 1242 // Check for cancelation. 1243 final boolean canceled = resetCancelNextUpFlag(this) 1244 || actionMasked == MotionEvent.ACTION_CANCEL; 1245 1246 // Update list of touch targets for pointer down, if needed. 1247 final boolean split = (mGroupFlags & FLAG_SPLIT_MOTION_EVENTS) != 0; 1248 TouchTarget newTouchTarget = null; 1249 boolean alreadyDispatchedToNewTouchTarget = false; 1250 if (!canceled && !intercepted) { 1251 if (actionMasked == MotionEvent.ACTION_DOWN 1252 || (split && actionMasked == MotionEvent.ACTION_POINTER_DOWN) 1253 || actionMasked == MotionEvent.ACTION_HOVER_MOVE) { 1254 final int actionIndex = ev.getActionIndex(); // always 0 for down 1255 final int idBitsToAssign = split ? 1 << ev.getPointerId(actionIndex) 1256 : TouchTarget.ALL_POINTER_IDS; 1257 1258 // Clean up earlier touch targets for this pointer id in case they 1259 // have become out of sync. 1260 removePointersFromTouchTargets(idBitsToAssign); 1261 1262 final int childrenCount = mChildrenCount; 1263 if (childrenCount != 0) { 1264 // Find a child that can receive the event. Scan children from front to back. 1265 final View[] children = mChildren; 1266 final float x = ev.getX(actionIndex); 1267 final float y = ev.getY(actionIndex); 1268 1269 for (int i = childrenCount - 1; i >= 0; i--) { 1270 final View child = children[i]; 1271 if ((child.mViewFlags & VISIBILITY_MASK) != VISIBLE 1272 && child.getAnimation() == null) { 1273 // Skip invisible child unless it is animating. 1274 continue; 1275 } 1276 1277 if (!isTransformedTouchPointInView(x, y, child, null)) { 1278 // New pointer is out of child's bounds. 1279 continue; 1280 } 1281 1282 newTouchTarget = getTouchTarget(child); 1283 if (newTouchTarget != null) { 1284 // Child is already receiving touch within its bounds. 1285 // Give it the new pointer in addition to the ones it is handling. 1286 newTouchTarget.pointerIdBits |= idBitsToAssign; 1287 break; 1288 } 1289 1290 resetCancelNextUpFlag(child); 1291 if (dispatchTransformedTouchEvent(ev, false, child, idBitsToAssign)) { 1292 // Child wants to receive touch within its bounds. 1293 mLastTouchDownTime = ev.getDownTime(); 1294 mLastTouchDownIndex = i; 1295 mLastTouchDownX = ev.getX(); 1296 mLastTouchDownY = ev.getY(); 1297 newTouchTarget = addTouchTarget(child, idBitsToAssign); 1298 alreadyDispatchedToNewTouchTarget = true; 1299 break; 1300 } 1301 } 1302 } 1303 1304 if (newTouchTarget == null && mFirstTouchTarget != null) { 1305 // Did not find a child to receive the event. 1306 // Assign the pointer to the least recently added target. 1307 newTouchTarget = mFirstTouchTarget; 1308 while (newTouchTarget.next != null) { 1309 newTouchTarget = newTouchTarget.next; 1310 } 1311 newTouchTarget.pointerIdBits |= idBitsToAssign; 1312 } 1313 } 1314 } 1315 1316 // Dispatch to touch targets. 1317 boolean handled = false; 1318 if (mFirstTouchTarget == null) { 1319 // No touch targets so treat this as an ordinary view. 1320 handled = dispatchTransformedTouchEvent(ev, canceled, null, 1321 TouchTarget.ALL_POINTER_IDS); 1322 } else { 1323 // Dispatch to touch targets, excluding the new touch target if we already 1324 // dispatched to it. Cancel touch targets if necessary. 1325 TouchTarget predecessor = null; 1326 TouchTarget target = mFirstTouchTarget; 1327 while (target != null) { 1328 final TouchTarget next = target.next; 1329 if (alreadyDispatchedToNewTouchTarget && target == newTouchTarget) { 1330 handled = true; 1331 } else { 1332 final boolean cancelChild = resetCancelNextUpFlag(target.child) || intercepted; 1333 if (dispatchTransformedTouchEvent(ev, cancelChild, 1334 target.child, target.pointerIdBits)) { 1335 handled = true; 1336 } 1337 if (cancelChild) { 1338 if (predecessor == null) { 1339 mFirstTouchTarget = next; 1340 } else { 1341 predecessor.next = next; 1342 } 1343 target.recycle(); 1344 target = next; 1345 continue; 1346 } 1347 } 1348 predecessor = target; 1349 target = next; 1350 } 1351 } 1352 1353 // Update list of touch targets for pointer up or cancel, if needed. 1354 if (canceled 1355 || actionMasked == MotionEvent.ACTION_UP 1356 || actionMasked == MotionEvent.ACTION_HOVER_MOVE) { 1357 resetTouchState(); 1358 } else if (split && actionMasked == MotionEvent.ACTION_POINTER_UP) { 1359 final int actionIndex = ev.getActionIndex(); 1360 final int idBitsToRemove = 1 << ev.getPointerId(actionIndex); 1361 removePointersFromTouchTargets(idBitsToRemove); 1362 } 1363 1364 return handled; 1365 } 1366 1367 /** 1368 * Resets all touch state in preparation for a new cycle. 1369 */ 1370 private void resetTouchState() { 1371 clearTouchTargets(); 1372 resetCancelNextUpFlag(this); 1373 mGroupFlags &= ~FLAG_DISALLOW_INTERCEPT; 1374 } 1375 1376 /** 1377 * Resets the cancel next up flag. 1378 * Returns true if the flag was previously set. 1379 */ 1380 private boolean resetCancelNextUpFlag(View view) { 1381 if ((view.mPrivateFlags & CANCEL_NEXT_UP_EVENT) != 0) { 1382 view.mPrivateFlags &= ~CANCEL_NEXT_UP_EVENT; 1383 return true; 1384 } 1385 return false; 1386 } 1387 1388 /** 1389 * Clears all touch targets. 1390 */ 1391 private void clearTouchTargets() { 1392 TouchTarget target = mFirstTouchTarget; 1393 if (target != null) { 1394 do { 1395 TouchTarget next = target.next; 1396 target.recycle(); 1397 target = next; 1398 } while (target != null); 1399 mFirstTouchTarget = null; 1400 } 1401 } 1402 1403 /** 1404 * Cancels and clears all touch targets. 1405 */ 1406 private void cancelAndClearTouchTargets(MotionEvent event) { 1407 if (mFirstTouchTarget != null) { 1408 boolean syntheticEvent = false; 1409 if (event == null) { 1410 final long now = SystemClock.uptimeMillis(); 1411 event = MotionEvent.obtain(now, now, 1412 MotionEvent.ACTION_CANCEL, 0.0f, 0.0f, 0); 1413 syntheticEvent = true; 1414 } 1415 1416 for (TouchTarget target = mFirstTouchTarget; target != null; target = target.next) { 1417 resetCancelNextUpFlag(target.child); 1418 dispatchTransformedTouchEvent(event, true, target.child, target.pointerIdBits); 1419 } 1420 clearTouchTargets(); 1421 1422 if (syntheticEvent) { 1423 event.recycle(); 1424 } 1425 } 1426 } 1427 1428 /** 1429 * Gets the touch target for specified child view. 1430 * Returns null if not found. 1431 */ 1432 private TouchTarget getTouchTarget(View child) { 1433 for (TouchTarget target = mFirstTouchTarget; target != null; target = target.next) { 1434 if (target.child == child) { 1435 return target; 1436 } 1437 } 1438 return null; 1439 } 1440 1441 /** 1442 * Adds a touch target for specified child to the beginning of the list. 1443 * Assumes the target child is not already present. 1444 */ 1445 private TouchTarget addTouchTarget(View child, int pointerIdBits) { 1446 TouchTarget target = TouchTarget.obtain(child, pointerIdBits); 1447 target.next = mFirstTouchTarget; 1448 mFirstTouchTarget = target; 1449 return target; 1450 } 1451 1452 /** 1453 * Removes the pointer ids from consideration. 1454 */ 1455 private void removePointersFromTouchTargets(int pointerIdBits) { 1456 TouchTarget predecessor = null; 1457 TouchTarget target = mFirstTouchTarget; 1458 while (target != null) { 1459 final TouchTarget next = target.next; 1460 if ((target.pointerIdBits & pointerIdBits) != 0) { 1461 target.pointerIdBits &= ~pointerIdBits; 1462 if (target.pointerIdBits == 0) { 1463 if (predecessor == null) { 1464 mFirstTouchTarget = next; 1465 } else { 1466 predecessor.next = next; 1467 } 1468 target.recycle(); 1469 target = next; 1470 continue; 1471 } 1472 } 1473 predecessor = target; 1474 target = next; 1475 } 1476 } 1477 1478 /** 1479 * Returns true if a child view contains the specified point when transformed 1480 * into its coordinate space. 1481 * Child must not be null. 1482 * @hide 1483 */ 1484 protected boolean isTransformedTouchPointInView(float x, float y, View child, 1485 PointF outLocalPoint) { 1486 float localX = x + mScrollX - child.mLeft; 1487 float localY = y + mScrollY - child.mTop; 1488 if (! child.hasIdentityMatrix() && mAttachInfo != null) { 1489 final float[] localXY = mAttachInfo.mTmpTransformLocation; 1490 localXY[0] = localX; 1491 localXY[1] = localY; 1492 child.getInverseMatrix().mapPoints(localXY); 1493 localX = localXY[0]; 1494 localY = localXY[1]; 1495 } 1496 final boolean isInView = child.pointInView(localX, localY); 1497 if (isInView && outLocalPoint != null) { 1498 outLocalPoint.set(localX, localY); 1499 } 1500 return isInView; 1501 } 1502 1503 /** 1504 * Transforms a motion event into the coordinate space of a particular child view, 1505 * filters out irrelevant pointer ids, and overrides its action if necessary. 1506 * If child is null, assumes the MotionEvent will be sent to this ViewGroup instead. 1507 */ 1508 private boolean dispatchTransformedTouchEvent(MotionEvent event, boolean cancel, 1509 View child, int desiredPointerIdBits) { 1510 final boolean handled; 1511 1512 // Canceling motions is a special case. We don't need to perform any transformations 1513 // or filtering. The important part is the action, not the contents. 1514 final int oldAction = event.getAction(); 1515 if (cancel || oldAction == MotionEvent.ACTION_CANCEL) { 1516 event.setAction(MotionEvent.ACTION_CANCEL); 1517 if (child == null) { 1518 handled = super.dispatchTouchEvent(event); 1519 } else { 1520 handled = child.dispatchTouchEvent(event); 1521 } 1522 event.setAction(oldAction); 1523 return handled; 1524 } 1525 1526 // Calculate the number of pointers to deliver. 1527 final int oldPointerCount = event.getPointerCount(); 1528 int newPointerCount = 0; 1529 if (desiredPointerIdBits == TouchTarget.ALL_POINTER_IDS) { 1530 newPointerCount = oldPointerCount; 1531 } else { 1532 for (int i = 0; i < oldPointerCount; i++) { 1533 final int pointerId = event.getPointerId(i); 1534 final int pointerIdBit = 1 << pointerId; 1535 if ((pointerIdBit & desiredPointerIdBits) != 0) { 1536 newPointerCount += 1; 1537 } 1538 } 1539 } 1540 1541 // If for some reason we ended up in an inconsistent state where it looks like we 1542 // might produce a motion event with no pointers in it, then drop the event. 1543 if (newPointerCount == 0) { 1544 return false; 1545 } 1546 1547 // If the number of pointers is the same and we don't need to perform any fancy 1548 // irreversible transformations, then we can reuse the motion event for this 1549 // dispatch as long as we are careful to revert any changes we make. 1550 final boolean reuse = newPointerCount == oldPointerCount 1551 && (child == null || child.hasIdentityMatrix()); 1552 if (reuse) { 1553 if (child == null) { 1554 handled = super.dispatchTouchEvent(event); 1555 } else { 1556 final float offsetX = mScrollX - child.mLeft; 1557 final float offsetY = mScrollY - child.mTop; 1558 event.offsetLocation(offsetX, offsetY); 1559 1560 handled = child.dispatchTouchEvent(event); 1561 1562 event.offsetLocation(-offsetX, -offsetY); 1563 } 1564 return handled; 1565 } 1566 1567 // Make a copy of the event. 1568 // If the number of pointers is different, then we need to filter out irrelevant pointers 1569 // as we make a copy of the motion event. 1570 MotionEvent transformedEvent; 1571 if (newPointerCount == oldPointerCount) { 1572 transformedEvent = MotionEvent.obtain(event); 1573 } else { 1574 growTmpPointerArrays(newPointerCount); 1575 final int[] newPointerIndexMap = mTmpPointerIndexMap; 1576 final int[] newPointerIds = mTmpPointerIds; 1577 final MotionEvent.PointerCoords[] newPointerCoords = mTmpPointerCoords; 1578 1579 int newPointerIndex = 0; 1580 int oldPointerIndex = 0; 1581 while (newPointerIndex < newPointerCount) { 1582 final int pointerId = event.getPointerId(oldPointerIndex); 1583 final int pointerIdBits = 1 << pointerId; 1584 if ((pointerIdBits & desiredPointerIdBits) != 0) { 1585 newPointerIndexMap[newPointerIndex] = oldPointerIndex; 1586 newPointerIds[newPointerIndex] = pointerId; 1587 if (newPointerCoords[newPointerIndex] == null) { 1588 newPointerCoords[newPointerIndex] = new MotionEvent.PointerCoords(); 1589 } 1590 1591 newPointerIndex += 1; 1592 } 1593 oldPointerIndex += 1; 1594 } 1595 1596 final int newAction; 1597 if (cancel) { 1598 newAction = MotionEvent.ACTION_CANCEL; 1599 } else { 1600 final int oldMaskedAction = oldAction & MotionEvent.ACTION_MASK; 1601 if (oldMaskedAction == MotionEvent.ACTION_POINTER_DOWN 1602 || oldMaskedAction == MotionEvent.ACTION_POINTER_UP) { 1603 final int changedPointerId = event.getPointerId( 1604 (oldAction & MotionEvent.ACTION_POINTER_INDEX_MASK) 1605 >> MotionEvent.ACTION_POINTER_INDEX_SHIFT); 1606 final int changedPointerIdBits = 1 << changedPointerId; 1607 if ((changedPointerIdBits & desiredPointerIdBits) != 0) { 1608 if (newPointerCount == 1) { 1609 // The first/last pointer went down/up. 1610 newAction = oldMaskedAction == MotionEvent.ACTION_POINTER_DOWN 1611 ? MotionEvent.ACTION_DOWN : MotionEvent.ACTION_UP; 1612 } else { 1613 // A secondary pointer went down/up. 1614 int newChangedPointerIndex = 0; 1615 while (newPointerIds[newChangedPointerIndex] != changedPointerId) { 1616 newChangedPointerIndex += 1; 1617 } 1618 newAction = oldMaskedAction | (newChangedPointerIndex 1619 << MotionEvent.ACTION_POINTER_INDEX_SHIFT); 1620 } 1621 } else { 1622 // An unrelated pointer changed. 1623 newAction = MotionEvent.ACTION_MOVE; 1624 } 1625 } else { 1626 // Simple up/down/cancel/move motion action. 1627 newAction = oldMaskedAction; 1628 } 1629 } 1630 1631 transformedEvent = null; 1632 final int historySize = event.getHistorySize(); 1633 for (int historyIndex = 0; historyIndex <= historySize; historyIndex++) { 1634 for (newPointerIndex = 0; newPointerIndex < newPointerCount; newPointerIndex++) { 1635 final MotionEvent.PointerCoords c = newPointerCoords[newPointerIndex]; 1636 oldPointerIndex = newPointerIndexMap[newPointerIndex]; 1637 if (historyIndex != historySize) { 1638 event.getHistoricalPointerCoords(oldPointerIndex, historyIndex, c); 1639 } else { 1640 event.getPointerCoords(oldPointerIndex, c); 1641 } 1642 } 1643 1644 final long eventTime; 1645 if (historyIndex != historySize) { 1646 eventTime = event.getHistoricalEventTime(historyIndex); 1647 } else { 1648 eventTime = event.getEventTime(); 1649 } 1650 1651 if (transformedEvent == null) { 1652 transformedEvent = MotionEvent.obtain( 1653 event.getDownTime(), eventTime, newAction, 1654 newPointerCount, newPointerIds, newPointerCoords, 1655 event.getMetaState(), event.getXPrecision(), event.getYPrecision(), 1656 event.getDeviceId(), event.getEdgeFlags(), event.getSource(), 1657 event.getFlags()); 1658 } else { 1659 transformedEvent.addBatch(eventTime, newPointerCoords, 0); 1660 } 1661 } 1662 } 1663 1664 // Perform any necessary transformations and dispatch. 1665 if (child == null) { 1666 handled = super.dispatchTouchEvent(transformedEvent); 1667 } else { 1668 final float offsetX = mScrollX - child.mLeft; 1669 final float offsetY = mScrollY - child.mTop; 1670 transformedEvent.offsetLocation(offsetX, offsetY); 1671 if (! child.hasIdentityMatrix()) { 1672 transformedEvent.transform(child.getInverseMatrix()); 1673 } 1674 1675 handled = child.dispatchTouchEvent(transformedEvent); 1676 } 1677 1678 // Done. 1679 transformedEvent.recycle(); 1680 return handled; 1681 } 1682 1683 /** 1684 * Enlarge the temporary pointer arrays for splitting pointers. 1685 * May discard contents (but keeps PointerCoords objects to avoid reallocating them). 1686 */ 1687 private void growTmpPointerArrays(int desiredCapacity) { 1688 final MotionEvent.PointerCoords[] oldTmpPointerCoords = mTmpPointerCoords; 1689 int capacity; 1690 if (oldTmpPointerCoords != null) { 1691 capacity = oldTmpPointerCoords.length; 1692 if (desiredCapacity <= capacity) { 1693 return; 1694 } 1695 } else { 1696 capacity = 4; 1697 } 1698 1699 while (capacity < desiredCapacity) { 1700 capacity *= 2; 1701 } 1702 1703 mTmpPointerIndexMap = new int[capacity]; 1704 mTmpPointerIds = new int[capacity]; 1705 mTmpPointerCoords = new MotionEvent.PointerCoords[capacity]; 1706 1707 if (oldTmpPointerCoords != null) { 1708 System.arraycopy(oldTmpPointerCoords, 0, mTmpPointerCoords, 0, 1709 oldTmpPointerCoords.length); 1710 } 1711 } 1712 1713 /** 1714 * Enable or disable the splitting of MotionEvents to multiple children during touch event 1715 * dispatch. This behavior is enabled by default for applications that target an 1716 * SDK version of {@link Build.VERSION_CODES#HONEYCOMB} or newer. 1717 * 1718 * <p>When this option is enabled MotionEvents may be split and dispatched to different child 1719 * views depending on where each pointer initially went down. This allows for user interactions 1720 * such as scrolling two panes of content independently, chording of buttons, and performing 1721 * independent gestures on different pieces of content. 1722 * 1723 * @param split <code>true</code> to allow MotionEvents to be split and dispatched to multiple 1724 * child views. <code>false</code> to only allow one child view to be the target of 1725 * any MotionEvent received by this ViewGroup. 1726 */ 1727 public void setMotionEventSplittingEnabled(boolean split) { 1728 // TODO Applications really shouldn't change this setting mid-touch event, 1729 // but perhaps this should handle that case and send ACTION_CANCELs to any child views 1730 // with gestures in progress when this is changed. 1731 if (split) { 1732 mGroupFlags |= FLAG_SPLIT_MOTION_EVENTS; 1733 } else { 1734 mGroupFlags &= ~FLAG_SPLIT_MOTION_EVENTS; 1735 } 1736 } 1737 1738 /** 1739 * Returns true if MotionEvents dispatched to this ViewGroup can be split to multiple children. 1740 * @return true if MotionEvents dispatched to this ViewGroup can be split to multiple children. 1741 */ 1742 public boolean isMotionEventSplittingEnabled() { 1743 return (mGroupFlags & FLAG_SPLIT_MOTION_EVENTS) == FLAG_SPLIT_MOTION_EVENTS; 1744 } 1745 1746 /** 1747 * {@inheritDoc} 1748 */ 1749 public void requestDisallowInterceptTouchEvent(boolean disallowIntercept) { 1750 1751 if (disallowIntercept == ((mGroupFlags & FLAG_DISALLOW_INTERCEPT) != 0)) { 1752 // We're already in this state, assume our ancestors are too 1753 return; 1754 } 1755 1756 if (disallowIntercept) { 1757 mGroupFlags |= FLAG_DISALLOW_INTERCEPT; 1758 } else { 1759 mGroupFlags &= ~FLAG_DISALLOW_INTERCEPT; 1760 } 1761 1762 // Pass it up to our parent 1763 if (mParent != null) { 1764 mParent.requestDisallowInterceptTouchEvent(disallowIntercept); 1765 } 1766 } 1767 1768 /** 1769 * Implement this method to intercept all touch screen motion events. This 1770 * allows you to watch events as they are dispatched to your children, and 1771 * take ownership of the current gesture at any point. 1772 * 1773 * <p>Using this function takes some care, as it has a fairly complicated 1774 * interaction with {@link View#onTouchEvent(MotionEvent) 1775 * View.onTouchEvent(MotionEvent)}, and using it requires implementing 1776 * that method as well as this one in the correct way. Events will be 1777 * received in the following order: 1778 * 1779 * <ol> 1780 * <li> You will receive the down event here. 1781 * <li> The down event will be handled either by a child of this view 1782 * group, or given to your own onTouchEvent() method to handle; this means 1783 * you should implement onTouchEvent() to return true, so you will 1784 * continue to see the rest of the gesture (instead of looking for 1785 * a parent view to handle it). Also, by returning true from 1786 * onTouchEvent(), you will not receive any following 1787 * events in onInterceptTouchEvent() and all touch processing must 1788 * happen in onTouchEvent() like normal. 1789 * <li> For as long as you return false from this function, each following 1790 * event (up to and including the final up) will be delivered first here 1791 * and then to the target's onTouchEvent(). 1792 * <li> If you return true from here, you will not receive any 1793 * following events: the target view will receive the same event but 1794 * with the action {@link MotionEvent#ACTION_CANCEL}, and all further 1795 * events will be delivered to your onTouchEvent() method and no longer 1796 * appear here. 1797 * </ol> 1798 * 1799 * @param ev The motion event being dispatched down the hierarchy. 1800 * @return Return true to steal motion events from the children and have 1801 * them dispatched to this ViewGroup through onTouchEvent(). 1802 * The current target will receive an ACTION_CANCEL event, and no further 1803 * messages will be delivered here. 1804 */ 1805 public boolean onInterceptTouchEvent(MotionEvent ev) { 1806 return false; 1807 } 1808 1809 /** 1810 * {@inheritDoc} 1811 * 1812 * Looks for a view to give focus to respecting the setting specified by 1813 * {@link #getDescendantFocusability()}. 1814 * 1815 * Uses {@link #onRequestFocusInDescendants(int, android.graphics.Rect)} to 1816 * find focus within the children of this group when appropriate. 1817 * 1818 * @see #FOCUS_BEFORE_DESCENDANTS 1819 * @see #FOCUS_AFTER_DESCENDANTS 1820 * @see #FOCUS_BLOCK_DESCENDANTS 1821 * @see #onRequestFocusInDescendants 1822 */ 1823 @Override 1824 public boolean requestFocus(int direction, Rect previouslyFocusedRect) { 1825 if (DBG) { 1826 System.out.println(this + " ViewGroup.requestFocus direction=" 1827 + direction); 1828 } 1829 int descendantFocusability = getDescendantFocusability(); 1830 1831 switch (descendantFocusability) { 1832 case FOCUS_BLOCK_DESCENDANTS: 1833 return super.requestFocus(direction, previouslyFocusedRect); 1834 case FOCUS_BEFORE_DESCENDANTS: { 1835 final boolean took = super.requestFocus(direction, previouslyFocusedRect); 1836 return took ? took : onRequestFocusInDescendants(direction, previouslyFocusedRect); 1837 } 1838 case FOCUS_AFTER_DESCENDANTS: { 1839 final boolean took = onRequestFocusInDescendants(direction, previouslyFocusedRect); 1840 return took ? took : super.requestFocus(direction, previouslyFocusedRect); 1841 } 1842 default: 1843 throw new IllegalStateException("descendant focusability must be " 1844 + "one of FOCUS_BEFORE_DESCENDANTS, FOCUS_AFTER_DESCENDANTS, FOCUS_BLOCK_DESCENDANTS " 1845 + "but is " + descendantFocusability); 1846 } 1847 } 1848 1849 /** 1850 * Look for a descendant to call {@link View#requestFocus} on. 1851 * Called by {@link ViewGroup#requestFocus(int, android.graphics.Rect)} 1852 * when it wants to request focus within its children. Override this to 1853 * customize how your {@link ViewGroup} requests focus within its children. 1854 * @param direction One of FOCUS_UP, FOCUS_DOWN, FOCUS_LEFT, and FOCUS_RIGHT 1855 * @param previouslyFocusedRect The rectangle (in this View's coordinate system) 1856 * to give a finer grained hint about where focus is coming from. May be null 1857 * if there is no hint. 1858 * @return Whether focus was taken. 1859 */ 1860 @SuppressWarnings({"ConstantConditions"}) 1861 protected boolean onRequestFocusInDescendants(int direction, 1862 Rect previouslyFocusedRect) { 1863 int index; 1864 int increment; 1865 int end; 1866 int count = mChildrenCount; 1867 if ((direction & FOCUS_FORWARD) != 0) { 1868 index = 0; 1869 increment = 1; 1870 end = count; 1871 } else { 1872 index = count - 1; 1873 increment = -1; 1874 end = -1; 1875 } 1876 final View[] children = mChildren; 1877 for (int i = index; i != end; i += increment) { 1878 View child = children[i]; 1879 if ((child.mViewFlags & VISIBILITY_MASK) == VISIBLE) { 1880 if (child.requestFocus(direction, previouslyFocusedRect)) { 1881 return true; 1882 } 1883 } 1884 } 1885 return false; 1886 } 1887 1888 /** 1889 * {@inheritDoc} 1890 * 1891 * @hide 1892 */ 1893 @Override 1894 public void dispatchStartTemporaryDetach() { 1895 super.dispatchStartTemporaryDetach(); 1896 final int count = mChildrenCount; 1897 final View[] children = mChildren; 1898 for (int i = 0; i < count; i++) { 1899 children[i].dispatchStartTemporaryDetach(); 1900 } 1901 } 1902 1903 /** 1904 * {@inheritDoc} 1905 * 1906 * @hide 1907 */ 1908 @Override 1909 public void dispatchFinishTemporaryDetach() { 1910 super.dispatchFinishTemporaryDetach(); 1911 final int count = mChildrenCount; 1912 final View[] children = mChildren; 1913 for (int i = 0; i < count; i++) { 1914 children[i].dispatchFinishTemporaryDetach(); 1915 } 1916 } 1917 1918 /** 1919 * {@inheritDoc} 1920 */ 1921 @Override 1922 void dispatchAttachedToWindow(AttachInfo info, int visibility) { 1923 super.dispatchAttachedToWindow(info, visibility); 1924 visibility |= mViewFlags & VISIBILITY_MASK; 1925 final int count = mChildrenCount; 1926 final View[] children = mChildren; 1927 for (int i = 0; i < count; i++) { 1928 children[i].dispatchAttachedToWindow(info, visibility); 1929 } 1930 } 1931 1932 @Override 1933 public boolean dispatchPopulateAccessibilityEvent(AccessibilityEvent event) { 1934 boolean populated = false; 1935 for (int i = 0, count = getChildCount(); i < count; i++) { 1936 populated |= getChildAt(i).dispatchPopulateAccessibilityEvent(event); 1937 } 1938 return populated; 1939 } 1940 1941 /** 1942 * {@inheritDoc} 1943 */ 1944 @Override 1945 void dispatchDetachedFromWindow() { 1946 // If we still have a touch target, we are still in the process of 1947 // dispatching motion events to a child; we need to get rid of that 1948 // child to avoid dispatching events to it after the window is torn 1949 // down. To make sure we keep the child in a consistent state, we 1950 // first send it an ACTION_CANCEL motion event. 1951 cancelAndClearTouchTargets(null); 1952 1953 // In case view is detached while transition is running 1954 mLayoutSuppressed = false; 1955 1956 // Tear down our drag tracking 1957 mDragNotifiedChildren = null; 1958 if (mCurrentDrag != null) { 1959 mCurrentDrag.recycle(); 1960 mCurrentDrag = null; 1961 } 1962 1963 final int count = mChildrenCount; 1964 final View[] children = mChildren; 1965 for (int i = 0; i < count; i++) { 1966 children[i].dispatchDetachedFromWindow(); 1967 } 1968 super.dispatchDetachedFromWindow(); 1969 } 1970 1971 /** 1972 * {@inheritDoc} 1973 */ 1974 @Override 1975 public void setPadding(int left, int top, int right, int bottom) { 1976 super.setPadding(left, top, right, bottom); 1977 1978 if ((mPaddingLeft | mPaddingTop | mPaddingRight | mPaddingRight) != 0) { 1979 mGroupFlags |= FLAG_PADDING_NOT_NULL; 1980 } else { 1981 mGroupFlags &= ~FLAG_PADDING_NOT_NULL; 1982 } 1983 } 1984 1985 /** 1986 * {@inheritDoc} 1987 */ 1988 @Override 1989 protected void dispatchSaveInstanceState(SparseArray<Parcelable> container) { 1990 super.dispatchSaveInstanceState(container); 1991 final int count = mChildrenCount; 1992 final View[] children = mChildren; 1993 for (int i = 0; i < count; i++) { 1994 View c = children[i]; 1995 if ((c.mViewFlags & PARENT_SAVE_DISABLED_MASK) != PARENT_SAVE_DISABLED) { 1996 c.dispatchSaveInstanceState(container); 1997 } 1998 } 1999 } 2000 2001 /** 2002 * Perform dispatching of a {@link #saveHierarchyState freeze()} to only this view, 2003 * not to its children. For use when overriding 2004 * {@link #dispatchSaveInstanceState dispatchFreeze()} to allow subclasses to freeze 2005 * their own state but not the state of their children. 2006 * 2007 * @param container the container 2008 */ 2009 protected void dispatchFreezeSelfOnly(SparseArray<Parcelable> container) { 2010 super.dispatchSaveInstanceState(container); 2011 } 2012 2013 /** 2014 * {@inheritDoc} 2015 */ 2016 @Override 2017 protected void dispatchRestoreInstanceState(SparseArray<Parcelable> container) { 2018 super.dispatchRestoreInstanceState(container); 2019 final int count = mChildrenCount; 2020 final View[] children = mChildren; 2021 for (int i = 0; i < count; i++) { 2022 View c = children[i]; 2023 if ((c.mViewFlags & PARENT_SAVE_DISABLED_MASK) != PARENT_SAVE_DISABLED) { 2024 c.dispatchRestoreInstanceState(container); 2025 } 2026 } 2027 } 2028 2029 /** 2030 * Perform dispatching of a {@link #restoreHierarchyState thaw()} to only this view, 2031 * not to its children. For use when overriding 2032 * {@link #dispatchRestoreInstanceState dispatchThaw()} to allow subclasses to thaw 2033 * their own state but not the state of their children. 2034 * 2035 * @param container the container 2036 */ 2037 protected void dispatchThawSelfOnly(SparseArray<Parcelable> container) { 2038 super.dispatchRestoreInstanceState(container); 2039 } 2040 2041 /** 2042 * Enables or disables the drawing cache for each child of this view group. 2043 * 2044 * @param enabled true to enable the cache, false to dispose of it 2045 */ 2046 protected void setChildrenDrawingCacheEnabled(boolean enabled) { 2047 if (enabled || (mPersistentDrawingCache & PERSISTENT_ALL_CACHES) != PERSISTENT_ALL_CACHES) { 2048 final View[] children = mChildren; 2049 final int count = mChildrenCount; 2050 for (int i = 0; i < count; i++) { 2051 children[i].setDrawingCacheEnabled(enabled); 2052 } 2053 } 2054 } 2055 2056 @Override 2057 protected void onAnimationStart() { 2058 super.onAnimationStart(); 2059 2060 // When this ViewGroup's animation starts, build the cache for the children 2061 if ((mGroupFlags & FLAG_ANIMATION_CACHE) == FLAG_ANIMATION_CACHE) { 2062 final int count = mChildrenCount; 2063 final View[] children = mChildren; 2064 final boolean buildCache = !isHardwareAccelerated(); 2065 2066 for (int i = 0; i < count; i++) { 2067 final View child = children[i]; 2068 if ((child.mViewFlags & VISIBILITY_MASK) == VISIBLE) { 2069 child.setDrawingCacheEnabled(true); 2070 if (buildCache) { 2071 child.buildDrawingCache(true); 2072 } 2073 } 2074 } 2075 2076 mGroupFlags |= FLAG_CHILDREN_DRAWN_WITH_CACHE; 2077 } 2078 } 2079 2080 @Override 2081 protected void onAnimationEnd() { 2082 super.onAnimationEnd(); 2083 2084 // When this ViewGroup's animation ends, destroy the cache of the children 2085 if ((mGroupFlags & FLAG_ANIMATION_CACHE) == FLAG_ANIMATION_CACHE) { 2086 mGroupFlags &= ~FLAG_CHILDREN_DRAWN_WITH_CACHE; 2087 2088 if ((mPersistentDrawingCache & PERSISTENT_ANIMATION_CACHE) == 0) { 2089 setChildrenDrawingCacheEnabled(false); 2090 } 2091 } 2092 } 2093 2094 @Override 2095 Bitmap createSnapshot(Bitmap.Config quality, int backgroundColor, boolean skipChildren) { 2096 int count = mChildrenCount; 2097 int[] visibilities = null; 2098 2099 if (skipChildren) { 2100 visibilities = new int[count]; 2101 for (int i = 0; i < count; i++) { 2102 View child = getChildAt(i); 2103 visibilities[i] = child.getVisibility(); 2104 if (visibilities[i] == View.VISIBLE) { 2105 child.setVisibility(INVISIBLE); 2106 } 2107 } 2108 } 2109 2110 Bitmap b = super.createSnapshot(quality, backgroundColor, skipChildren); 2111 2112 if (skipChildren) { 2113 for (int i = 0; i < count; i++) { 2114 getChildAt(i).setVisibility(visibilities[i]); 2115 } 2116 } 2117 2118 return b; 2119 } 2120 2121 /** 2122 * {@inheritDoc} 2123 */ 2124 @Override 2125 protected void dispatchDraw(Canvas canvas) { 2126 final int count = mChildrenCount; 2127 final View[] children = mChildren; 2128 int flags = mGroupFlags; 2129 2130 if ((flags & FLAG_RUN_ANIMATION) != 0 && canAnimate()) { 2131 final boolean cache = (mGroupFlags & FLAG_ANIMATION_CACHE) == FLAG_ANIMATION_CACHE; 2132 2133 final boolean buildCache = !isHardwareAccelerated(); 2134 for (int i = 0; i < count; i++) { 2135 final View child = children[i]; 2136 if ((child.mViewFlags & VISIBILITY_MASK) == VISIBLE) { 2137 final LayoutParams params = child.getLayoutParams(); 2138 attachLayoutAnimationParameters(child, params, i, count); 2139 bindLayoutAnimation(child); 2140 if (cache) { 2141 child.setDrawingCacheEnabled(true); 2142 if (buildCache) { 2143 child.buildDrawingCache(true); 2144 } 2145 } 2146 } 2147 } 2148 2149 final LayoutAnimationController controller = mLayoutAnimationController; 2150 if (controller.willOverlap()) { 2151 mGroupFlags |= FLAG_OPTIMIZE_INVALIDATE; 2152 } 2153 2154 controller.start(); 2155 2156 mGroupFlags &= ~FLAG_RUN_ANIMATION; 2157 mGroupFlags &= ~FLAG_ANIMATION_DONE; 2158 2159 if (cache) { 2160 mGroupFlags |= FLAG_CHILDREN_DRAWN_WITH_CACHE; 2161 } 2162 2163 if (mAnimationListener != null) { 2164 mAnimationListener.onAnimationStart(controller.getAnimation()); 2165 } 2166 } 2167 2168 int saveCount = 0; 2169 final boolean clipToPadding = (flags & CLIP_TO_PADDING_MASK) == CLIP_TO_PADDING_MASK; 2170 if (clipToPadding) { 2171 saveCount = canvas.save(); 2172 canvas.clipRect(mScrollX + mPaddingLeft, mScrollY + mPaddingTop, 2173 mScrollX + mRight - mLeft - mPaddingRight, 2174 mScrollY + mBottom - mTop - mPaddingBottom); 2175 2176 } 2177 2178 // We will draw our child's animation, let's reset the flag 2179 mPrivateFlags &= ~DRAW_ANIMATION; 2180 mGroupFlags &= ~FLAG_INVALIDATE_REQUIRED; 2181 2182 boolean more = false; 2183 final long drawingTime = getDrawingTime(); 2184 2185 if ((flags & FLAG_USE_CHILD_DRAWING_ORDER) == 0) { 2186 for (int i = 0; i < count; i++) { 2187 final View child = children[i]; 2188 if ((child.mViewFlags & VISIBILITY_MASK) == VISIBLE || child.getAnimation() != null) { 2189 more |= drawChild(canvas, child, drawingTime); 2190 } 2191 } 2192 } else { 2193 for (int i = 0; i < count; i++) { 2194 final View child = children[getChildDrawingOrder(count, i)]; 2195 if ((child.mViewFlags & VISIBILITY_MASK) == VISIBLE || child.getAnimation() != null) { 2196 more |= drawChild(canvas, child, drawingTime); 2197 } 2198 } 2199 } 2200 2201 // Draw any disappearing views that have animations 2202 if (mDisappearingChildren != null) { 2203 final ArrayList<View> disappearingChildren = mDisappearingChildren; 2204 final int disappearingCount = disappearingChildren.size() - 1; 2205 // Go backwards -- we may delete as animations finish 2206 for (int i = disappearingCount; i >= 0; i--) { 2207 final View child = disappearingChildren.get(i); 2208 more |= drawChild(canvas, child, drawingTime); 2209 } 2210 } 2211 2212 if (clipToPadding) { 2213 canvas.restoreToCount(saveCount); 2214 } 2215 2216 // mGroupFlags might have been updated by drawChild() 2217 flags = mGroupFlags; 2218 2219 if ((flags & FLAG_INVALIDATE_REQUIRED) == FLAG_INVALIDATE_REQUIRED) { 2220 invalidate(true); 2221 } 2222 2223 if ((flags & FLAG_ANIMATION_DONE) == 0 && (flags & FLAG_NOTIFY_ANIMATION_LISTENER) == 0 && 2224 mLayoutAnimationController.isDone() && !more) { 2225 // We want to erase the drawing cache and notify the listener after the 2226 // next frame is drawn because one extra invalidate() is caused by 2227 // drawChild() after the animation is over 2228 mGroupFlags |= FLAG_NOTIFY_ANIMATION_LISTENER; 2229 final Runnable end = new Runnable() { 2230 public void run() { 2231 notifyAnimationListener(); 2232 } 2233 }; 2234 post(end); 2235 } 2236 } 2237 2238 /** 2239 * Returns the index of the child to draw for this iteration. Override this 2240 * if you want to change the drawing order of children. By default, it 2241 * returns i. 2242 * <p> 2243 * NOTE: In order for this method to be called, you must enable child ordering 2244 * first by calling {@link #setChildrenDrawingOrderEnabled(boolean)}. 2245 * 2246 * @param i The current iteration. 2247 * @return The index of the child to draw this iteration. 2248 * 2249 * @see #setChildrenDrawingOrderEnabled(boolean) 2250 * @see #isChildrenDrawingOrderEnabled() 2251 */ 2252 protected int getChildDrawingOrder(int childCount, int i) { 2253 return i; 2254 } 2255 2256 private void notifyAnimationListener() { 2257 mGroupFlags &= ~FLAG_NOTIFY_ANIMATION_LISTENER; 2258 mGroupFlags |= FLAG_ANIMATION_DONE; 2259 2260 if (mAnimationListener != null) { 2261 final Runnable end = new Runnable() { 2262 public void run() { 2263 mAnimationListener.onAnimationEnd(mLayoutAnimationController.getAnimation()); 2264 } 2265 }; 2266 post(end); 2267 } 2268 2269 if ((mGroupFlags & FLAG_ANIMATION_CACHE) == FLAG_ANIMATION_CACHE) { 2270 mGroupFlags &= ~FLAG_CHILDREN_DRAWN_WITH_CACHE; 2271 if ((mPersistentDrawingCache & PERSISTENT_ANIMATION_CACHE) == 0) { 2272 setChildrenDrawingCacheEnabled(false); 2273 } 2274 } 2275 2276 invalidate(true); 2277 } 2278 2279 /** 2280 * This method is used to cause children of this ViewGroup to restore or recreate their 2281 * display lists. It is called by getDisplayList() when the parent ViewGroup does not need 2282 * to recreate its own display list, which would happen if it went through the normal 2283 * draw/dispatchDraw mechanisms. 2284 * 2285 * @hide 2286 */ 2287 @Override 2288 protected void dispatchGetDisplayList() { 2289 final int count = mChildrenCount; 2290 final View[] children = mChildren; 2291 for (int i = 0; i < count; i++) { 2292 final View child = children[i]; 2293 if ((child.mViewFlags & VISIBILITY_MASK) == VISIBLE || child.getAnimation() != null) { 2294 child.mRecreateDisplayList = (child.mPrivateFlags & INVALIDATED) == INVALIDATED; 2295 child.mPrivateFlags &= ~INVALIDATED; 2296 child.getDisplayList(); 2297 child.mRecreateDisplayList = false; 2298 } 2299 } 2300 } 2301 2302 /** 2303 * Draw one child of this View Group. This method is responsible for getting 2304 * the canvas in the right state. This includes clipping, translating so 2305 * that the child's scrolled origin is at 0, 0, and applying any animation 2306 * transformations. 2307 * 2308 * @param canvas The canvas on which to draw the child 2309 * @param child Who to draw 2310 * @param drawingTime The time at which draw is occuring 2311 * @return True if an invalidate() was issued 2312 */ 2313 protected boolean drawChild(Canvas canvas, View child, long drawingTime) { 2314 boolean more = false; 2315 2316 final int cl = child.mLeft; 2317 final int ct = child.mTop; 2318 final int cr = child.mRight; 2319 final int cb = child.mBottom; 2320 2321 final boolean childHasIdentityMatrix = child.hasIdentityMatrix(); 2322 2323 final int flags = mGroupFlags; 2324 2325 if ((flags & FLAG_CLEAR_TRANSFORMATION) == FLAG_CLEAR_TRANSFORMATION) { 2326 mChildTransformation.clear(); 2327 mGroupFlags &= ~FLAG_CLEAR_TRANSFORMATION; 2328 } 2329 2330 Transformation transformToApply = null; 2331 Transformation invalidationTransform; 2332 final Animation a = child.getAnimation(); 2333 boolean concatMatrix = false; 2334 2335 boolean scalingRequired = false; 2336 boolean caching; 2337 int layerType = mDrawLayers ? child.getLayerType() : LAYER_TYPE_NONE; 2338 2339 final boolean hardwareAccelerated = canvas.isHardwareAccelerated(); 2340 if ((flags & FLAG_CHILDREN_DRAWN_WITH_CACHE) == FLAG_CHILDREN_DRAWN_WITH_CACHE || 2341 (flags & FLAG_ALWAYS_DRAWN_WITH_CACHE) == FLAG_ALWAYS_DRAWN_WITH_CACHE) { 2342 caching = true; 2343 if (mAttachInfo != null) scalingRequired = mAttachInfo.mScalingRequired; 2344 } else { 2345 caching = (layerType != LAYER_TYPE_NONE) || hardwareAccelerated; 2346 } 2347 2348 if (a != null) { 2349 final boolean initialized = a.isInitialized(); 2350 if (!initialized) { 2351 a.initialize(cr - cl, cb - ct, getWidth(), getHeight()); 2352 a.initializeInvalidateRegion(0, 0, cr - cl, cb - ct); 2353 child.onAnimationStart(); 2354 } 2355 2356 more = a.getTransformation(drawingTime, mChildTransformation, 2357 scalingRequired ? mAttachInfo.mApplicationScale : 1f); 2358 if (scalingRequired && mAttachInfo.mApplicationScale != 1f) { 2359 if (mInvalidationTransformation == null) { 2360 mInvalidationTransformation = new Transformation(); 2361 } 2362 invalidationTransform = mInvalidationTransformation; 2363 a.getTransformation(drawingTime, invalidationTransform, 1f); 2364 } else { 2365 invalidationTransform = mChildTransformation; 2366 } 2367 transformToApply = mChildTransformation; 2368 2369 concatMatrix = a.willChangeTransformationMatrix(); 2370 2371 if (more) { 2372 if (!a.willChangeBounds()) { 2373 if ((flags & (FLAG_OPTIMIZE_INVALIDATE | FLAG_ANIMATION_DONE)) == 2374 FLAG_OPTIMIZE_INVALIDATE) { 2375 mGroupFlags |= FLAG_INVALIDATE_REQUIRED; 2376 } else if ((flags & FLAG_INVALIDATE_REQUIRED) == 0) { 2377 // The child need to draw an animation, potentially offscreen, so 2378 // make sure we do not cancel invalidate requests 2379 mPrivateFlags |= DRAW_ANIMATION; 2380 invalidate(cl, ct, cr, cb); 2381 } 2382 } else { 2383 if (mInvalidateRegion == null) { 2384 mInvalidateRegion = new RectF(); 2385 } 2386 final RectF region = mInvalidateRegion; 2387 a.getInvalidateRegion(0, 0, cr - cl, cb - ct, region, invalidationTransform); 2388 2389 // The child need to draw an animation, potentially offscreen, so 2390 // make sure we do not cancel invalidate requests 2391 mPrivateFlags |= DRAW_ANIMATION; 2392 2393 final int left = cl + (int) region.left; 2394 final int top = ct + (int) region.top; 2395 invalidate(left, top, left + (int) region.width(), top + (int) region.height()); 2396 } 2397 } 2398 } else if ((flags & FLAG_SUPPORT_STATIC_TRANSFORMATIONS) == 2399 FLAG_SUPPORT_STATIC_TRANSFORMATIONS) { 2400 final boolean hasTransform = getChildStaticTransformation(child, mChildTransformation); 2401 if (hasTransform) { 2402 final int transformType = mChildTransformation.getTransformationType(); 2403 transformToApply = transformType != Transformation.TYPE_IDENTITY ? 2404 mChildTransformation : null; 2405 concatMatrix = (transformType & Transformation.TYPE_MATRIX) != 0; 2406 } 2407 } 2408 2409 concatMatrix |= !childHasIdentityMatrix; 2410 2411 // Sets the flag as early as possible to allow draw() implementations 2412 // to call invalidate() successfully when doing animations 2413 child.mPrivateFlags |= DRAWN; 2414 2415 if (!concatMatrix && canvas.quickReject(cl, ct, cr, cb, Canvas.EdgeType.BW) && 2416 (child.mPrivateFlags & DRAW_ANIMATION) == 0) { 2417 return more; 2418 } 2419 2420 float alpha = child.getAlpha(); 2421 // Bail out early if the view does not need to be drawn 2422 if (alpha <= ViewConfiguration.ALPHA_THRESHOLD && (child.mPrivateFlags & ALPHA_SET) == 0 && 2423 !(child instanceof SurfaceView)) { 2424 return more; 2425 } 2426 2427 if (hardwareAccelerated) { 2428 // Clear INVALIDATED flag to allow invalidation to occur during rendering, but 2429 // retain the flag's value temporarily in the mRecreateDisplayList flag 2430 child.mRecreateDisplayList = (child.mPrivateFlags & INVALIDATED) == INVALIDATED; 2431 child.mPrivateFlags &= ~INVALIDATED; 2432 } 2433 2434 child.computeScroll(); 2435 2436 final int sx = child.mScrollX; 2437 final int sy = child.mScrollY; 2438 2439 DisplayList displayList = null; 2440 Bitmap cache = null; 2441 boolean hasDisplayList = false; 2442 if (caching) { 2443 if (!hardwareAccelerated) { 2444 if (layerType != LAYER_TYPE_NONE) { 2445 layerType = LAYER_TYPE_SOFTWARE; 2446 child.buildDrawingCache(true); 2447 } 2448 cache = child.getDrawingCache(true); 2449 } else { 2450 if (layerType == LAYER_TYPE_SOFTWARE) { 2451 child.buildDrawingCache(true); 2452 cache = child.getDrawingCache(true); 2453 } else if (layerType == LAYER_TYPE_NONE) { 2454 // Delay getting the display list until animation-driven alpha values are 2455 // set up and possibly passed on to the view 2456 hasDisplayList = child.canHaveDisplayList(); 2457 } 2458 } 2459 } 2460 2461 final boolean hasNoCache = cache == null || hasDisplayList; 2462 2463 final int restoreTo = canvas.save(); 2464 if (cache == null && !hasDisplayList) { 2465 canvas.translate(cl - sx, ct - sy); 2466 } else { 2467 canvas.translate(cl, ct); 2468 if (scalingRequired) { 2469 // mAttachInfo cannot be null, otherwise scalingRequired == false 2470 final float scale = 1.0f / mAttachInfo.mApplicationScale; 2471 canvas.scale(scale, scale); 2472 } 2473 } 2474 2475 if (transformToApply != null || alpha < 1.0f || !child.hasIdentityMatrix()) { 2476 if (transformToApply != null || !childHasIdentityMatrix) { 2477 int transX = 0; 2478 int transY = 0; 2479 2480 if (cache == null && !hasDisplayList) { 2481 transX = -sx; 2482 transY = -sy; 2483 } 2484 2485 if (transformToApply != null) { 2486 if (concatMatrix) { 2487 // Undo the scroll translation, apply the transformation matrix, 2488 // then redo the scroll translate to get the correct result. 2489 canvas.translate(-transX, -transY); 2490 canvas.concat(transformToApply.getMatrix()); 2491 canvas.translate(transX, transY); 2492 mGroupFlags |= FLAG_CLEAR_TRANSFORMATION; 2493 } 2494 2495 float transformAlpha = transformToApply.getAlpha(); 2496 if (transformAlpha < 1.0f) { 2497 alpha *= transformToApply.getAlpha(); 2498 mGroupFlags |= FLAG_CLEAR_TRANSFORMATION; 2499 } 2500 } 2501 2502 if (!childHasIdentityMatrix) { 2503 canvas.translate(-transX, -transY); 2504 canvas.concat(child.getMatrix()); 2505 canvas.translate(transX, transY); 2506 } 2507 } 2508 2509 if (alpha < 1.0f) { 2510 mGroupFlags |= FLAG_CLEAR_TRANSFORMATION; 2511 if (hasNoCache) { 2512 final int multipliedAlpha = (int) (255 * alpha); 2513 if (!child.onSetAlpha(multipliedAlpha)) { 2514 int layerFlags = Canvas.HAS_ALPHA_LAYER_SAVE_FLAG; 2515 if ((flags & FLAG_CLIP_CHILDREN) == FLAG_CLIP_CHILDREN || 2516 layerType != LAYER_TYPE_NONE) { 2517 layerFlags |= Canvas.CLIP_TO_LAYER_SAVE_FLAG; 2518 } 2519 if (layerType == LAYER_TYPE_NONE) { 2520 canvas.saveLayerAlpha(sx, sy, sx + cr - cl, sy + cb - ct, 2521 multipliedAlpha, layerFlags); 2522 } 2523 } else { 2524 // Alpha is handled by the child directly, clobber the layer's alpha 2525 child.mPrivateFlags |= ALPHA_SET; 2526 } 2527 } 2528 } 2529 } else if ((child.mPrivateFlags & ALPHA_SET) == ALPHA_SET) { 2530 child.onSetAlpha(255); 2531 child.mPrivateFlags &= ~ALPHA_SET; 2532 } 2533 2534 if ((flags & FLAG_CLIP_CHILDREN) == FLAG_CLIP_CHILDREN) { 2535 if (cache == null && !hasDisplayList) { 2536 canvas.clipRect(sx, sy, sx + (cr - cl), sy + (cb - ct)); 2537 } else { 2538 if (!scalingRequired || cache == null) { 2539 canvas.clipRect(0, 0, cr - cl, cb - ct); 2540 } else { 2541 canvas.clipRect(0, 0, cache.getWidth(), cache.getHeight()); 2542 } 2543 } 2544 } 2545 2546 if (hasDisplayList) { 2547 displayList = child.getDisplayList(); 2548 } 2549 2550 if (hasNoCache) { 2551 boolean layerRendered = false; 2552 if (layerType == LAYER_TYPE_HARDWARE) { 2553 final HardwareLayer layer = child.getHardwareLayer(); 2554 if (layer != null && layer.isValid()) { 2555 child.mLayerPaint.setAlpha((int) (alpha * 255)); 2556 ((HardwareCanvas) canvas).drawHardwareLayer(layer, 0, 0, child.mLayerPaint); 2557 layerRendered = true; 2558 } else { 2559 canvas.saveLayer(sx, sy, sx + cr - cl, sy + cb - ct, child.mLayerPaint, 2560 Canvas.HAS_ALPHA_LAYER_SAVE_FLAG | Canvas.CLIP_TO_LAYER_SAVE_FLAG); 2561 } 2562 } 2563 2564 if (!layerRendered) { 2565 if (!hasDisplayList) { 2566 // Fast path for layouts with no backgrounds 2567 if ((child.mPrivateFlags & SKIP_DRAW) == SKIP_DRAW) { 2568 if (ViewDebug.TRACE_HIERARCHY) { 2569 ViewDebug.trace(this, ViewDebug.HierarchyTraceType.DRAW); 2570 } 2571 child.mPrivateFlags &= ~DIRTY_MASK; 2572 child.dispatchDraw(canvas); 2573 } else { 2574 child.draw(canvas); 2575 } 2576 } else { 2577 child.mPrivateFlags &= ~DIRTY_MASK; 2578 ((HardwareCanvas) canvas).drawDisplayList(displayList); 2579 } 2580 } 2581 } else if (cache != null) { 2582 child.mPrivateFlags &= ~DIRTY_MASK; 2583 Paint cachePaint; 2584 2585 if (layerType == LAYER_TYPE_NONE) { 2586 cachePaint = mCachePaint; 2587 if (alpha < 1.0f) { 2588 cachePaint.setAlpha((int) (alpha * 255)); 2589 mGroupFlags |= FLAG_ALPHA_LOWER_THAN_ONE; 2590 } else if ((flags & FLAG_ALPHA_LOWER_THAN_ONE) == FLAG_ALPHA_LOWER_THAN_ONE) { 2591 cachePaint.setAlpha(255); 2592 mGroupFlags &= ~FLAG_ALPHA_LOWER_THAN_ONE; 2593 } 2594 } else { 2595 cachePaint = child.mLayerPaint; 2596 cachePaint.setAlpha((int) (alpha * 255)); 2597 } 2598 canvas.drawBitmap(cache, 0.0f, 0.0f, cachePaint); 2599 } 2600 2601 canvas.restoreToCount(restoreTo); 2602 2603 if (a != null && !more) { 2604 if (!hardwareAccelerated && !a.getFillAfter()) { 2605 child.onSetAlpha(255); 2606 } 2607 finishAnimatingView(child, a); 2608 } 2609 2610 if (more && hardwareAccelerated) { 2611 // invalidation is the trigger to recreate display lists, so if we're using 2612 // display lists to render, force an invalidate to allow the animation to 2613 // continue drawing another frame 2614 invalidate(true); 2615 if (a instanceof AlphaAnimation) { 2616 // alpha animations should cause the child to recreate its display list 2617 child.invalidate(true); 2618 } 2619 } 2620 2621 child.mRecreateDisplayList = false; 2622 2623 return more; 2624 } 2625 2626 /** 2627 * 2628 * @param enabled True if children should be drawn with layers, false otherwise. 2629 * 2630 * @hide 2631 */ 2632 public void setChildrenLayersEnabled(boolean enabled) { 2633 if (enabled != mDrawLayers) { 2634 mDrawLayers = enabled; 2635 invalidate(true); 2636 2637 // We need to invalidate any child with a layer. For instance, 2638 // if a child is backed by a hardware layer and we disable layers 2639 // the child is marked as not dirty (flags cleared the last time 2640 // the child was drawn inside its layer.) However, that child might 2641 // never have created its own display list or have an obsolete 2642 // display list. By invalidating the child we ensure the display 2643 // list is in sync with the content of the hardware layer. 2644 for (int i = 0; i < mChildrenCount; i++) { 2645 View child = mChildren[i]; 2646 if (child.mLayerType != LAYER_TYPE_NONE) { 2647 child.invalidate(true); 2648 } 2649 } 2650 } 2651 } 2652 2653 /** 2654 * By default, children are clipped to their bounds before drawing. This 2655 * allows view groups to override this behavior for animations, etc. 2656 * 2657 * @param clipChildren true to clip children to their bounds, 2658 * false otherwise 2659 * @attr ref android.R.styleable#ViewGroup_clipChildren 2660 */ 2661 public void setClipChildren(boolean clipChildren) { 2662 setBooleanFlag(FLAG_CLIP_CHILDREN, clipChildren); 2663 } 2664 2665 /** 2666 * By default, children are clipped to the padding of the ViewGroup. This 2667 * allows view groups to override this behavior 2668 * 2669 * @param clipToPadding true to clip children to the padding of the 2670 * group, false otherwise 2671 * @attr ref android.R.styleable#ViewGroup_clipToPadding 2672 */ 2673 public void setClipToPadding(boolean clipToPadding) { 2674 setBooleanFlag(FLAG_CLIP_TO_PADDING, clipToPadding); 2675 } 2676 2677 /** 2678 * {@inheritDoc} 2679 */ 2680 @Override 2681 public void dispatchSetSelected(boolean selected) { 2682 final View[] children = mChildren; 2683 final int count = mChildrenCount; 2684 for (int i = 0; i < count; i++) { 2685 children[i].setSelected(selected); 2686 } 2687 } 2688 2689 /** 2690 * {@inheritDoc} 2691 */ 2692 @Override 2693 public void dispatchSetActivated(boolean activated) { 2694 final View[] children = mChildren; 2695 final int count = mChildrenCount; 2696 for (int i = 0; i < count; i++) { 2697 children[i].setActivated(activated); 2698 } 2699 } 2700 2701 @Override 2702 protected void dispatchSetPressed(boolean pressed) { 2703 final View[] children = mChildren; 2704 final int count = mChildrenCount; 2705 for (int i = 0; i < count; i++) { 2706 children[i].setPressed(pressed); 2707 } 2708 } 2709 2710 /** 2711 * When this property is set to true, this ViewGroup supports static transformations on 2712 * children; this causes 2713 * {@link #getChildStaticTransformation(View, android.view.animation.Transformation)} to be 2714 * invoked when a child is drawn. 2715 * 2716 * Any subclass overriding 2717 * {@link #getChildStaticTransformation(View, android.view.animation.Transformation)} should 2718 * set this property to true. 2719 * 2720 * @param enabled True to enable static transformations on children, false otherwise. 2721 * 2722 * @see #FLAG_SUPPORT_STATIC_TRANSFORMATIONS 2723 */ 2724 protected void setStaticTransformationsEnabled(boolean enabled) { 2725 setBooleanFlag(FLAG_SUPPORT_STATIC_TRANSFORMATIONS, enabled); 2726 } 2727 2728 /** 2729 * {@inheritDoc} 2730 * 2731 * @see #setStaticTransformationsEnabled(boolean) 2732 */ 2733 protected boolean getChildStaticTransformation(View child, Transformation t) { 2734 return false; 2735 } 2736 2737 /** 2738 * {@hide} 2739 */ 2740 @Override 2741 protected View findViewTraversal(int id) { 2742 if (id == mID) { 2743 return this; 2744 } 2745 2746 final View[] where = mChildren; 2747 final int len = mChildrenCount; 2748 2749 for (int i = 0; i < len; i++) { 2750 View v = where[i]; 2751 2752 if ((v.mPrivateFlags & IS_ROOT_NAMESPACE) == 0) { 2753 v = v.findViewById(id); 2754 2755 if (v != null) { 2756 return v; 2757 } 2758 } 2759 } 2760 2761 return null; 2762 } 2763 2764 /** 2765 * {@hide} 2766 */ 2767 @Override 2768 protected View findViewWithTagTraversal(Object tag) { 2769 if (tag != null && tag.equals(mTag)) { 2770 return this; 2771 } 2772 2773 final View[] where = mChildren; 2774 final int len = mChildrenCount; 2775 2776 for (int i = 0; i < len; i++) { 2777 View v = where[i]; 2778 2779 if ((v.mPrivateFlags & IS_ROOT_NAMESPACE) == 0) { 2780 v = v.findViewWithTag(tag); 2781 2782 if (v != null) { 2783 return v; 2784 } 2785 } 2786 } 2787 2788 return null; 2789 } 2790 2791 /** 2792 * {@hide} 2793 */ 2794 @Override 2795 protected View findViewByPredicateTraversal(Predicate<View> predicate) { 2796 if (predicate.apply(this)) { 2797 return this; 2798 } 2799 2800 final View[] where = mChildren; 2801 final int len = mChildrenCount; 2802 2803 for (int i = 0; i < len; i++) { 2804 View v = where[i]; 2805 2806 if ((v.mPrivateFlags & IS_ROOT_NAMESPACE) == 0) { 2807 v = v.findViewByPredicate(predicate); 2808 2809 if (v != null) { 2810 return v; 2811 } 2812 } 2813 } 2814 2815 return null; 2816 } 2817 2818 /** 2819 * Adds a child view. If no layout parameters are already set on the child, the 2820 * default parameters for this ViewGroup are set on the child. 2821 * 2822 * @param child the child view to add 2823 * 2824 * @see #generateDefaultLayoutParams() 2825 */ 2826 public void addView(View child) { 2827 addView(child, -1); 2828 } 2829 2830 /** 2831 * Adds a child view. If no layout parameters are already set on the child, the 2832 * default parameters for this ViewGroup are set on the child. 2833 * 2834 * @param child the child view to add 2835 * @param index the position at which to add the child 2836 * 2837 * @see #generateDefaultLayoutParams() 2838 */ 2839 public void addView(View child, int index) { 2840 LayoutParams params = child.getLayoutParams(); 2841 if (params == null) { 2842 params = generateDefaultLayoutParams(); 2843 if (params == null) { 2844 throw new IllegalArgumentException("generateDefaultLayoutParams() cannot return null"); 2845 } 2846 } 2847 addView(child, index, params); 2848 } 2849 2850 /** 2851 * Adds a child view with this ViewGroup's default layout parameters and the 2852 * specified width and height. 2853 * 2854 * @param child the child view to add 2855 */ 2856 public void addView(View child, int width, int height) { 2857 final LayoutParams params = generateDefaultLayoutParams(); 2858 params.width = width; 2859 params.height = height; 2860 addView(child, -1, params); 2861 } 2862 2863 /** 2864 * Adds a child view with the specified layout parameters. 2865 * 2866 * @param child the child view to add 2867 * @param params the layout parameters to set on the child 2868 */ 2869 public void addView(View child, LayoutParams params) { 2870 addView(child, -1, params); 2871 } 2872 2873 /** 2874 * Adds a child view with the specified layout parameters. 2875 * 2876 * @param child the child view to add 2877 * @param index the position at which to add the child 2878 * @param params the layout parameters to set on the child 2879 */ 2880 public void addView(View child, int index, LayoutParams params) { 2881 if (DBG) { 2882 System.out.println(this + " addView"); 2883 } 2884 2885 // addViewInner() will call child.requestLayout() when setting the new LayoutParams 2886 // therefore, we call requestLayout() on ourselves before, so that the child's request 2887 // will be blocked at our level 2888 requestLayout(); 2889 invalidate(true); 2890 addViewInner(child, index, params, false); 2891 } 2892 2893 /** 2894 * {@inheritDoc} 2895 */ 2896 public void updateViewLayout(View view, ViewGroup.LayoutParams params) { 2897 if (!checkLayoutParams(params)) { 2898 throw new IllegalArgumentException("Invalid LayoutParams supplied to " + this); 2899 } 2900 if (view.mParent != this) { 2901 throw new IllegalArgumentException("Given view not a child of " + this); 2902 } 2903 view.setLayoutParams(params); 2904 } 2905 2906 /** 2907 * {@inheritDoc} 2908 */ 2909 protected boolean checkLayoutParams(ViewGroup.LayoutParams p) { 2910 return p != null; 2911 } 2912 2913 /** 2914 * Interface definition for a callback to be invoked when the hierarchy 2915 * within this view changed. The hierarchy changes whenever a child is added 2916 * to or removed from this view. 2917 */ 2918 public interface OnHierarchyChangeListener { 2919 /** 2920 * Called when a new child is added to a parent view. 2921 * 2922 * @param parent the view in which a child was added 2923 * @param child the new child view added in the hierarchy 2924 */ 2925 void onChildViewAdded(View parent, View child); 2926 2927 /** 2928 * Called when a child is removed from a parent view. 2929 * 2930 * @param parent the view from which the child was removed 2931 * @param child the child removed from the hierarchy 2932 */ 2933 void onChildViewRemoved(View parent, View child); 2934 } 2935 2936 /** 2937 * Register a callback to be invoked when a child is added to or removed 2938 * from this view. 2939 * 2940 * @param listener the callback to invoke on hierarchy change 2941 */ 2942 public void setOnHierarchyChangeListener(OnHierarchyChangeListener listener) { 2943 mOnHierarchyChangeListener = listener; 2944 } 2945 2946 /** 2947 * Adds a view during layout. This is useful if in your onLayout() method, 2948 * you need to add more views (as does the list view for example). 2949 * 2950 * If index is negative, it means put it at the end of the list. 2951 * 2952 * @param child the view to add to the group 2953 * @param index the index at which the child must be added 2954 * @param params the layout parameters to associate with the child 2955 * @return true if the child was added, false otherwise 2956 */ 2957 protected boolean addViewInLayout(View child, int index, LayoutParams params) { 2958 return addViewInLayout(child, index, params, false); 2959 } 2960 2961 /** 2962 * Adds a view during layout. This is useful if in your onLayout() method, 2963 * you need to add more views (as does the list view for example). 2964 * 2965 * If index is negative, it means put it at the end of the list. 2966 * 2967 * @param child the view to add to the group 2968 * @param index the index at which the child must be added 2969 * @param params the layout parameters to associate with the child 2970 * @param preventRequestLayout if true, calling this method will not trigger a 2971 * layout request on child 2972 * @return true if the child was added, false otherwise 2973 */ 2974 protected boolean addViewInLayout(View child, int index, LayoutParams params, 2975 boolean preventRequestLayout) { 2976 child.mParent = null; 2977 addViewInner(child, index, params, preventRequestLayout); 2978 child.mPrivateFlags = (child.mPrivateFlags & ~DIRTY_MASK) | DRAWN; 2979 return true; 2980 } 2981 2982 /** 2983 * Prevents the specified child to be laid out during the next layout pass. 2984 * 2985 * @param child the child on which to perform the cleanup 2986 */ 2987 protected void cleanupLayoutState(View child) { 2988 child.mPrivateFlags &= ~View.FORCE_LAYOUT; 2989 } 2990 2991 private void addViewInner(View child, int index, LayoutParams params, 2992 boolean preventRequestLayout) { 2993 2994 if (mTransition != null && mTransition.isRunning()) { 2995 mTransition.cancel(); 2996 } 2997 2998 if (child.getParent() != null) { 2999 throw new IllegalStateException("The specified child already has a parent. " + 3000 "You must call removeView() on the child's parent first."); 3001 } 3002 3003 if (mTransition != null) { 3004 mTransition.addChild(this, child); 3005 } 3006 3007 if (!checkLayoutParams(params)) { 3008 params = generateLayoutParams(params); 3009 } 3010 3011 if (preventRequestLayout) { 3012 child.mLayoutParams = params; 3013 } else { 3014 child.setLayoutParams(params); 3015 } 3016 3017 if (index < 0) { 3018 index = mChildrenCount; 3019 } 3020 3021 addInArray(child, index); 3022 3023 // tell our children 3024 if (preventRequestLayout) { 3025 child.assignParent(this); 3026 } else { 3027 child.mParent = this; 3028 } 3029 3030 if (child.hasFocus()) { 3031 requestChildFocus(child, child.findFocus()); 3032 } 3033 3034 AttachInfo ai = mAttachInfo; 3035 if (ai != null) { 3036 boolean lastKeepOn = ai.mKeepScreenOn; 3037 ai.mKeepScreenOn = false; 3038 child.dispatchAttachedToWindow(mAttachInfo, (mViewFlags&VISIBILITY_MASK)); 3039 if (ai.mKeepScreenOn) { 3040 needGlobalAttributesUpdate(true); 3041 } 3042 ai.mKeepScreenOn = lastKeepOn; 3043 } 3044 3045 if (mOnHierarchyChangeListener != null) { 3046 mOnHierarchyChangeListener.onChildViewAdded(this, child); 3047 } 3048 3049 if ((child.mViewFlags & DUPLICATE_PARENT_STATE) == DUPLICATE_PARENT_STATE) { 3050 mGroupFlags |= FLAG_NOTIFY_CHILDREN_ON_DRAWABLE_STATE_CHANGE; 3051 } 3052 } 3053 3054 private void addInArray(View child, int index) { 3055 View[] children = mChildren; 3056 final int count = mChildrenCount; 3057 final int size = children.length; 3058 if (index == count) { 3059 if (size == count) { 3060 mChildren = new View[size + ARRAY_CAPACITY_INCREMENT]; 3061 System.arraycopy(children, 0, mChildren, 0, size); 3062 children = mChildren; 3063 } 3064 children[mChildrenCount++] = child; 3065 } else if (index < count) { 3066 if (size == count) { 3067 mChildren = new View[size + ARRAY_CAPACITY_INCREMENT]; 3068 System.arraycopy(children, 0, mChildren, 0, index); 3069 System.arraycopy(children, index, mChildren, index + 1, count - index); 3070 children = mChildren; 3071 } else { 3072 System.arraycopy(children, index, children, index + 1, count - index); 3073 } 3074 children[index] = child; 3075 mChildrenCount++; 3076 if (mLastTouchDownIndex >= index) { 3077 mLastTouchDownIndex++; 3078 } 3079 } else { 3080 throw new IndexOutOfBoundsException("index=" + index + " count=" + count); 3081 } 3082 } 3083 3084 // This method also sets the child's mParent to null 3085 private void removeFromArray(int index) { 3086 final View[] children = mChildren; 3087 if (!(mTransitioningViews != null && mTransitioningViews.contains(children[index]))) { 3088 children[index].mParent = null; 3089 } 3090 final int count = mChildrenCount; 3091 if (index == count - 1) { 3092 children[--mChildrenCount] = null; 3093 } else if (index >= 0 && index < count) { 3094 System.arraycopy(children, index + 1, children, index, count - index - 1); 3095 children[--mChildrenCount] = null; 3096 } else { 3097 throw new IndexOutOfBoundsException(); 3098 } 3099 if (mLastTouchDownIndex == index) { 3100 mLastTouchDownTime = 0; 3101 mLastTouchDownIndex = -1; 3102 } else if (mLastTouchDownIndex > index) { 3103 mLastTouchDownIndex--; 3104 } 3105 } 3106 3107 // This method also sets the children's mParent to null 3108 private void removeFromArray(int start, int count) { 3109 final View[] children = mChildren; 3110 final int childrenCount = mChildrenCount; 3111 3112 start = Math.max(0, start); 3113 final int end = Math.min(childrenCount, start + count); 3114 3115 if (start == end) { 3116 return; 3117 } 3118 3119 if (end == childrenCount) { 3120 for (int i = start; i < end; i++) { 3121 children[i].mParent = null; 3122 children[i] = null; 3123 } 3124 } else { 3125 for (int i = start; i < end; i++) { 3126 children[i].mParent = null; 3127 } 3128 3129 // Since we're looping above, we might as well do the copy, but is arraycopy() 3130 // faster than the extra 2 bounds checks we would do in the loop? 3131 System.arraycopy(children, end, children, start, childrenCount - end); 3132 3133 for (int i = childrenCount - (end - start); i < childrenCount; i++) { 3134 children[i] = null; 3135 } 3136 } 3137 3138 mChildrenCount -= (end - start); 3139 } 3140 3141 private void bindLayoutAnimation(View child) { 3142 Animation a = mLayoutAnimationController.getAnimationForView(child); 3143 child.setAnimation(a); 3144 } 3145 3146 /** 3147 * Subclasses should override this method to set layout animation 3148 * parameters on the supplied child. 3149 * 3150 * @param child the child to associate with animation parameters 3151 * @param params the child's layout parameters which hold the animation 3152 * parameters 3153 * @param index the index of the child in the view group 3154 * @param count the number of children in the view group 3155 */ 3156 protected void attachLayoutAnimationParameters(View child, 3157 LayoutParams params, int index, int count) { 3158 LayoutAnimationController.AnimationParameters animationParams = 3159 params.layoutAnimationParameters; 3160 if (animationParams == null) { 3161 animationParams = new LayoutAnimationController.AnimationParameters(); 3162 params.layoutAnimationParameters = animationParams; 3163 } 3164 3165 animationParams.count = count; 3166 animationParams.index = index; 3167 } 3168 3169 /** 3170 * {@inheritDoc} 3171 */ 3172 public void removeView(View view) { 3173 removeViewInternal(view); 3174 requestLayout(); 3175 invalidate(true); 3176 } 3177 3178 /** 3179 * Removes a view during layout. This is useful if in your onLayout() method, 3180 * you need to remove more views. 3181 * 3182 * @param view the view to remove from the group 3183 */ 3184 public void removeViewInLayout(View view) { 3185 removeViewInternal(view); 3186 } 3187 3188 /** 3189 * Removes a range of views during layout. This is useful if in your onLayout() method, 3190 * you need to remove more views. 3191 * 3192 * @param start the index of the first view to remove from the group 3193 * @param count the number of views to remove from the group 3194 */ 3195 public void removeViewsInLayout(int start, int count) { 3196 removeViewsInternal(start, count); 3197 } 3198 3199 /** 3200 * Removes the view at the specified position in the group. 3201 * 3202 * @param index the position in the group of the view to remove 3203 */ 3204 public void removeViewAt(int index) { 3205 removeViewInternal(index, getChildAt(index)); 3206 requestLayout(); 3207 invalidate(true); 3208 } 3209 3210 /** 3211 * Removes the specified range of views from the group. 3212 * 3213 * @param start the first position in the group of the range of views to remove 3214 * @param count the number of views to remove 3215 */ 3216 public void removeViews(int start, int count) { 3217 removeViewsInternal(start, count); 3218 requestLayout(); 3219 invalidate(true); 3220 } 3221 3222 private void removeViewInternal(View view) { 3223 final int index = indexOfChild(view); 3224 if (index >= 0) { 3225 removeViewInternal(index, view); 3226 } 3227 } 3228 3229 private void removeViewInternal(int index, View view) { 3230 3231 if (mTransition != null) { 3232 mTransition.removeChild(this, view); 3233 } 3234 3235 boolean clearChildFocus = false; 3236 if (view == mFocused) { 3237 view.clearFocusForRemoval(); 3238 clearChildFocus = true; 3239 } 3240 3241 if (view.getAnimation() != null || 3242 (mTransitioningViews != null && mTransitioningViews.contains(view))) { 3243 addDisappearingView(view); 3244 } else if (view.mAttachInfo != null) { 3245 view.dispatchDetachedFromWindow(); 3246 } 3247 3248 if (mOnHierarchyChangeListener != null) { 3249 mOnHierarchyChangeListener.onChildViewRemoved(this, view); 3250 } 3251 3252 needGlobalAttributesUpdate(false); 3253 3254 removeFromArray(index); 3255 3256 if (clearChildFocus) { 3257 clearChildFocus(view); 3258 } 3259 } 3260 3261 /** 3262 * Sets the LayoutTransition object for this ViewGroup. If the LayoutTransition object is 3263 * not null, changes in layout which occur because of children being added to or removed from 3264 * the ViewGroup will be animated according to the animations defined in that LayoutTransition 3265 * object. By default, the transition object is null (so layout changes are not animated). 3266 * 3267 * @param transition The LayoutTransition object that will animated changes in layout. A value 3268 * of <code>null</code> means no transition will run on layout changes. 3269 * @attr ref android.R.styleable#ViewGroup_animateLayoutChanges 3270 */ 3271 public void setLayoutTransition(LayoutTransition transition) { 3272 if (mTransition != null) { 3273 mTransition.removeTransitionListener(mLayoutTransitionListener); 3274 } 3275 mTransition = transition; 3276 if (mTransition != null) { 3277 mTransition.addTransitionListener(mLayoutTransitionListener); 3278 } 3279 } 3280 3281 /** 3282 * Gets the LayoutTransition object for this ViewGroup. If the LayoutTransition object is 3283 * not null, changes in layout which occur because of children being added to or removed from 3284 * the ViewGroup will be animated according to the animations defined in that LayoutTransition 3285 * object. By default, the transition object is null (so layout changes are not animated). 3286 * 3287 * @return LayoutTranstion The LayoutTransition object that will animated changes in layout. 3288 * A value of <code>null</code> means no transition will run on layout changes. 3289 */ 3290 public LayoutTransition getLayoutTransition() { 3291 return mTransition; 3292 } 3293 3294 private void removeViewsInternal(int start, int count) { 3295 final OnHierarchyChangeListener onHierarchyChangeListener = mOnHierarchyChangeListener; 3296 final boolean notifyListener = onHierarchyChangeListener != null; 3297 final View focused = mFocused; 3298 final boolean detach = mAttachInfo != null; 3299 View clearChildFocus = null; 3300 3301 final View[] children = mChildren; 3302 final int end = start + count; 3303 3304 for (int i = start; i < end; i++) { 3305 final View view = children[i]; 3306 3307 if (mTransition != null) { 3308 mTransition.removeChild(this, view); 3309 } 3310 3311 if (view == focused) { 3312 view.clearFocusForRemoval(); 3313 clearChildFocus = view; 3314 } 3315 3316 if (view.getAnimation() != null || 3317 (mTransitioningViews != null && mTransitioningViews.contains(view))) { 3318 addDisappearingView(view); 3319 } else if (detach) { 3320 view.dispatchDetachedFromWindow(); 3321 } 3322 3323 needGlobalAttributesUpdate(false); 3324 3325 if (notifyListener) { 3326 onHierarchyChangeListener.onChildViewRemoved(this, view); 3327 } 3328 } 3329 3330 removeFromArray(start, count); 3331 3332 if (clearChildFocus != null) { 3333 clearChildFocus(clearChildFocus); 3334 } 3335 } 3336 3337 /** 3338 * Call this method to remove all child views from the 3339 * ViewGroup. 3340 */ 3341 public void removeAllViews() { 3342 removeAllViewsInLayout(); 3343 requestLayout(); 3344 invalidate(true); 3345 } 3346 3347 /** 3348 * Called by a ViewGroup subclass to remove child views from itself, 3349 * when it must first know its size on screen before it can calculate how many 3350 * child views it will render. An example is a Gallery or a ListView, which 3351 * may "have" 50 children, but actually only render the number of children 3352 * that can currently fit inside the object on screen. Do not call 3353 * this method unless you are extending ViewGroup and understand the 3354 * view measuring and layout pipeline. 3355 */ 3356 public void removeAllViewsInLayout() { 3357 final int count = mChildrenCount; 3358 if (count <= 0) { 3359 return; 3360 } 3361 3362 final View[] children = mChildren; 3363 mChildrenCount = 0; 3364 3365 final OnHierarchyChangeListener listener = mOnHierarchyChangeListener; 3366 final boolean notify = listener != null; 3367 final View focused = mFocused; 3368 final boolean detach = mAttachInfo != null; 3369 View clearChildFocus = null; 3370 3371 needGlobalAttributesUpdate(false); 3372 3373 for (int i = count - 1; i >= 0; i--) { 3374 final View view = children[i]; 3375 3376 if (mTransition != null) { 3377 mTransition.removeChild(this, view); 3378 } 3379 3380 if (view == focused) { 3381 view.clearFocusForRemoval(); 3382 clearChildFocus = view; 3383 } 3384 3385 if (view.getAnimation() != null || 3386 (mTransitioningViews != null && mTransitioningViews.contains(view))) { 3387 addDisappearingView(view); 3388 } else if (detach) { 3389 view.dispatchDetachedFromWindow(); 3390 } 3391 3392 if (notify) { 3393 listener.onChildViewRemoved(this, view); 3394 } 3395 3396 view.mParent = null; 3397 children[i] = null; 3398 } 3399 3400 if (clearChildFocus != null) { 3401 clearChildFocus(clearChildFocus); 3402 } 3403 } 3404 3405 /** 3406 * Finishes the removal of a detached view. This method will dispatch the detached from 3407 * window event and notify the hierarchy change listener. 3408 * 3409 * @param child the child to be definitely removed from the view hierarchy 3410 * @param animate if true and the view has an animation, the view is placed in the 3411 * disappearing views list, otherwise, it is detached from the window 3412 * 3413 * @see #attachViewToParent(View, int, android.view.ViewGroup.LayoutParams) 3414 * @see #detachAllViewsFromParent() 3415 * @see #detachViewFromParent(View) 3416 * @see #detachViewFromParent(int) 3417 */ 3418 protected void removeDetachedView(View child, boolean animate) { 3419 if (mTransition != null) { 3420 mTransition.removeChild(this, child); 3421 } 3422 3423 if (child == mFocused) { 3424 child.clearFocus(); 3425 } 3426 3427 if ((animate && child.getAnimation() != null) || 3428 (mTransitioningViews != null && mTransitioningViews.contains(child))) { 3429 addDisappearingView(child); 3430 } else if (child.mAttachInfo != null) { 3431 child.dispatchDetachedFromWindow(); 3432 } 3433 3434 if (mOnHierarchyChangeListener != null) { 3435 mOnHierarchyChangeListener.onChildViewRemoved(this, child); 3436 } 3437 } 3438 3439 /** 3440 * Attaches a view to this view group. Attaching a view assigns this group as the parent, 3441 * sets the layout parameters and puts the view in the list of children so it can be retrieved 3442 * by calling {@link #getChildAt(int)}. 3443 * 3444 * This method should be called only for view which were detached from their parent. 3445 * 3446 * @param child the child to attach 3447 * @param index the index at which the child should be attached 3448 * @param params the layout parameters of the child 3449 * 3450 * @see #removeDetachedView(View, boolean) 3451 * @see #detachAllViewsFromParent() 3452 * @see #detachViewFromParent(View) 3453 * @see #detachViewFromParent(int) 3454 */ 3455 protected void attachViewToParent(View child, int index, LayoutParams params) { 3456 child.mLayoutParams = params; 3457 3458 if (index < 0) { 3459 index = mChildrenCount; 3460 } 3461 3462 addInArray(child, index); 3463 3464 child.mParent = this; 3465 child.mPrivateFlags = (child.mPrivateFlags & ~DIRTY_MASK & ~DRAWING_CACHE_VALID) | 3466 DRAWN | INVALIDATED; 3467 this.mPrivateFlags |= INVALIDATED; 3468 3469 if (child.hasFocus()) { 3470 requestChildFocus(child, child.findFocus()); 3471 } 3472 } 3473 3474 /** 3475 * Detaches a view from its parent. Detaching a view should be temporary and followed 3476 * either by a call to {@link #attachViewToParent(View, int, android.view.ViewGroup.LayoutParams)} 3477 * or a call to {@link #removeDetachedView(View, boolean)}. When a view is detached, 3478 * its parent is null and cannot be retrieved by a call to {@link #getChildAt(int)}. 3479 * 3480 * @param child the child to detach 3481 * 3482 * @see #detachViewFromParent(int) 3483 * @see #detachViewsFromParent(int, int) 3484 * @see #detachAllViewsFromParent() 3485 * @see #attachViewToParent(View, int, android.view.ViewGroup.LayoutParams) 3486 * @see #removeDetachedView(View, boolean) 3487 */ 3488 protected void detachViewFromParent(View child) { 3489 removeFromArray(indexOfChild(child)); 3490 } 3491 3492 /** 3493 * Detaches a view from its parent. Detaching a view should be temporary and followed 3494 * either by a call to {@link #attachViewToParent(View, int, android.view.ViewGroup.LayoutParams)} 3495 * or a call to {@link #removeDetachedView(View, boolean)}. When a view is detached, 3496 * its parent is null and cannot be retrieved by a call to {@link #getChildAt(int)}. 3497 * 3498 * @param index the index of the child to detach 3499 * 3500 * @see #detachViewFromParent(View) 3501 * @see #detachAllViewsFromParent() 3502 * @see #detachViewsFromParent(int, int) 3503 * @see #attachViewToParent(View, int, android.view.ViewGroup.LayoutParams) 3504 * @see #removeDetachedView(View, boolean) 3505 */ 3506 protected void detachViewFromParent(int index) { 3507 removeFromArray(index); 3508 } 3509 3510 /** 3511 * Detaches a range of view from their parent. Detaching a view should be temporary and followed 3512 * either by a call to {@link #attachViewToParent(View, int, android.view.ViewGroup.LayoutParams)} 3513 * or a call to {@link #removeDetachedView(View, boolean)}. When a view is detached, its 3514 * parent is null and cannot be retrieved by a call to {@link #getChildAt(int)}. 3515 * 3516 * @param start the first index of the childrend range to detach 3517 * @param count the number of children to detach 3518 * 3519 * @see #detachViewFromParent(View) 3520 * @see #detachViewFromParent(int) 3521 * @see #detachAllViewsFromParent() 3522 * @see #attachViewToParent(View, int, android.view.ViewGroup.LayoutParams) 3523 * @see #removeDetachedView(View, boolean) 3524 */ 3525 protected void detachViewsFromParent(int start, int count) { 3526 removeFromArray(start, count); 3527 } 3528 3529 /** 3530 * Detaches all views from the parent. Detaching a view should be temporary and followed 3531 * either by a call to {@link #attachViewToParent(View, int, android.view.ViewGroup.LayoutParams)} 3532 * or a call to {@link #removeDetachedView(View, boolean)}. When a view is detached, 3533 * its parent is null and cannot be retrieved by a call to {@link #getChildAt(int)}. 3534 * 3535 * @see #detachViewFromParent(View) 3536 * @see #detachViewFromParent(int) 3537 * @see #detachViewsFromParent(int, int) 3538 * @see #attachViewToParent(View, int, android.view.ViewGroup.LayoutParams) 3539 * @see #removeDetachedView(View, boolean) 3540 */ 3541 protected void detachAllViewsFromParent() { 3542 final int count = mChildrenCount; 3543 if (count <= 0) { 3544 return; 3545 } 3546 3547 final View[] children = mChildren; 3548 mChildrenCount = 0; 3549 3550 for (int i = count - 1; i >= 0; i--) { 3551 children[i].mParent = null; 3552 children[i] = null; 3553 } 3554 } 3555 3556 /** 3557 * Don't call or override this method. It is used for the implementation of 3558 * the view hierarchy. 3559 */ 3560 public final void invalidateChild(View child, final Rect dirty) { 3561 if (ViewDebug.TRACE_HIERARCHY) { 3562 ViewDebug.trace(this, ViewDebug.HierarchyTraceType.INVALIDATE_CHILD); 3563 } 3564 3565 ViewParent parent = this; 3566 3567 final AttachInfo attachInfo = mAttachInfo; 3568 if (attachInfo != null) { 3569 // If the child is drawing an animation, we want to copy this flag onto 3570 // ourselves and the parent to make sure the invalidate request goes 3571 // through 3572 final boolean drawAnimation = (child.mPrivateFlags & DRAW_ANIMATION) == DRAW_ANIMATION; 3573 3574 if (dirty == null) { 3575 if (child.mLayerType != LAYER_TYPE_NONE) { 3576 mPrivateFlags |= INVALIDATED; 3577 mPrivateFlags &= ~DRAWING_CACHE_VALID; 3578 child.mLocalDirtyRect.setEmpty(); 3579 } 3580 do { 3581 View view = null; 3582 if (parent instanceof View) { 3583 view = (View) parent; 3584 if (view.mLayerType != LAYER_TYPE_NONE) { 3585 view.mLocalDirtyRect.setEmpty(); 3586 if (view.getParent() instanceof View) { 3587 final View grandParent = (View) view.getParent(); 3588 grandParent.mPrivateFlags |= INVALIDATED; 3589 grandParent.mPrivateFlags &= ~DRAWING_CACHE_VALID; 3590 } 3591 } 3592 if ((view.mPrivateFlags & DIRTY_MASK) != 0) { 3593 // already marked dirty - we're done 3594 break; 3595 } 3596 } 3597 3598 if (drawAnimation) { 3599 if (view != null) { 3600 view.mPrivateFlags |= DRAW_ANIMATION; 3601 } else if (parent instanceof ViewRoot) { 3602 ((ViewRoot) parent).mIsAnimating = true; 3603 } 3604 } 3605 3606 if (parent instanceof ViewRoot) { 3607 ((ViewRoot) parent).invalidate(); 3608 parent = null; 3609 } else if (view != null) { 3610 if ((view.mPrivateFlags & DRAWN) == DRAWN || 3611 (view.mPrivateFlags & DRAWING_CACHE_VALID) == DRAWING_CACHE_VALID) { 3612 view.mPrivateFlags &= ~DRAWING_CACHE_VALID; 3613 view.mPrivateFlags |= DIRTY; 3614 parent = view.mParent; 3615 } else { 3616 parent = null; 3617 } 3618 } 3619 } while (parent != null); 3620 } else { 3621 // Check whether the child that requests the invalidate is fully opaque 3622 final boolean isOpaque = child.isOpaque() && !drawAnimation && 3623 child.getAnimation() == null; 3624 // Mark the child as dirty, using the appropriate flag 3625 // Make sure we do not set both flags at the same time 3626 int opaqueFlag = isOpaque ? DIRTY_OPAQUE : DIRTY; 3627 3628 if (child.mLayerType != LAYER_TYPE_NONE) { 3629 mPrivateFlags |= INVALIDATED; 3630 mPrivateFlags &= ~DRAWING_CACHE_VALID; 3631 child.mLocalDirtyRect.union(dirty); 3632 } 3633 3634 final int[] location = attachInfo.mInvalidateChildLocation; 3635 location[CHILD_LEFT_INDEX] = child.mLeft; 3636 location[CHILD_TOP_INDEX] = child.mTop; 3637 Matrix childMatrix = child.getMatrix(); 3638 if (!childMatrix.isIdentity()) { 3639 RectF boundingRect = attachInfo.mTmpTransformRect; 3640 boundingRect.set(dirty); 3641 childMatrix.mapRect(boundingRect); 3642 dirty.set((int) boundingRect.left, (int) boundingRect.top, 3643 (int) (boundingRect.right + 0.5f), 3644 (int) (boundingRect.bottom + 0.5f)); 3645 } 3646 3647 do { 3648 View view = null; 3649 if (parent instanceof View) { 3650 view = (View) parent; 3651 if (view.mLayerType != LAYER_TYPE_NONE && 3652 view.getParent() instanceof View) { 3653 final View grandParent = (View) view.getParent(); 3654 grandParent.mPrivateFlags |= INVALIDATED; 3655 grandParent.mPrivateFlags &= ~DRAWING_CACHE_VALID; 3656 } 3657 } 3658 3659 if (drawAnimation) { 3660 if (view != null) { 3661 view.mPrivateFlags |= DRAW_ANIMATION; 3662 } else if (parent instanceof ViewRoot) { 3663 ((ViewRoot) parent).mIsAnimating = true; 3664 } 3665 } 3666 3667 // If the parent is dirty opaque or not dirty, mark it dirty with the opaque 3668 // flag coming from the child that initiated the invalidate 3669 if (view != null) { 3670 if ((view.mViewFlags & FADING_EDGE_MASK) != 0 && 3671 view.getSolidColor() == 0 && !view.isOpaque()) { 3672 opaqueFlag = DIRTY; 3673 } 3674 if ((view.mPrivateFlags & DIRTY_MASK) != DIRTY) { 3675 view.mPrivateFlags = (view.mPrivateFlags & ~DIRTY_MASK) | opaqueFlag; 3676 } 3677 } 3678 3679 parent = parent.invalidateChildInParent(location, dirty); 3680 if (view != null) { 3681 // Account for transform on current parent 3682 Matrix m = view.getMatrix(); 3683 if (!m.isIdentity()) { 3684 RectF boundingRect = attachInfo.mTmpTransformRect; 3685 boundingRect.set(dirty); 3686 m.mapRect(boundingRect); 3687 dirty.set((int) boundingRect.left, (int) boundingRect.top, 3688 (int) (boundingRect.right + 0.5f), 3689 (int) (boundingRect.bottom + 0.5f)); 3690 } 3691 } 3692 } while (parent != null); 3693 } 3694 } 3695 } 3696 3697 /** 3698 * Don't call or override this method. It is used for the implementation of 3699 * the view hierarchy. 3700 * 3701 * This implementation returns null if this ViewGroup does not have a parent, 3702 * if this ViewGroup is already fully invalidated or if the dirty rectangle 3703 * does not intersect with this ViewGroup's bounds. 3704 */ 3705 public ViewParent invalidateChildInParent(final int[] location, final Rect dirty) { 3706 if (ViewDebug.TRACE_HIERARCHY) { 3707 ViewDebug.trace(this, ViewDebug.HierarchyTraceType.INVALIDATE_CHILD_IN_PARENT); 3708 } 3709 3710 if ((mPrivateFlags & DRAWN) == DRAWN || 3711 (mPrivateFlags & DRAWING_CACHE_VALID) == DRAWING_CACHE_VALID) { 3712 if ((mGroupFlags & (FLAG_OPTIMIZE_INVALIDATE | FLAG_ANIMATION_DONE)) != 3713 FLAG_OPTIMIZE_INVALIDATE) { 3714 dirty.offset(location[CHILD_LEFT_INDEX] - mScrollX, 3715 location[CHILD_TOP_INDEX] - mScrollY); 3716 3717 final int left = mLeft; 3718 final int top = mTop; 3719 3720 if (dirty.intersect(0, 0, mRight - left, mBottom - top) || 3721 (mPrivateFlags & DRAW_ANIMATION) == DRAW_ANIMATION) { 3722 mPrivateFlags &= ~DRAWING_CACHE_VALID; 3723 3724 location[CHILD_LEFT_INDEX] = left; 3725 location[CHILD_TOP_INDEX] = top; 3726 3727 if (mLayerType != LAYER_TYPE_NONE) { 3728 mLocalDirtyRect.union(dirty); 3729 } 3730 3731 return mParent; 3732 } 3733 } else { 3734 mPrivateFlags &= ~DRAWN & ~DRAWING_CACHE_VALID; 3735 3736 location[CHILD_LEFT_INDEX] = mLeft; 3737 location[CHILD_TOP_INDEX] = mTop; 3738 3739 dirty.set(0, 0, mRight - mLeft, mBottom - mTop); 3740 3741 if (mLayerType != LAYER_TYPE_NONE) { 3742 mLocalDirtyRect.union(dirty); 3743 } 3744 3745 return mParent; 3746 } 3747 } 3748 3749 return null; 3750 } 3751 3752 /** 3753 * Offset a rectangle that is in a descendant's coordinate 3754 * space into our coordinate space. 3755 * @param descendant A descendant of this view 3756 * @param rect A rectangle defined in descendant's coordinate space. 3757 */ 3758 public final void offsetDescendantRectToMyCoords(View descendant, Rect rect) { 3759 offsetRectBetweenParentAndChild(descendant, rect, true, false); 3760 } 3761 3762 /** 3763 * Offset a rectangle that is in our coordinate space into an ancestor's 3764 * coordinate space. 3765 * @param descendant A descendant of this view 3766 * @param rect A rectangle defined in descendant's coordinate space. 3767 */ 3768 public final void offsetRectIntoDescendantCoords(View descendant, Rect rect) { 3769 offsetRectBetweenParentAndChild(descendant, rect, false, false); 3770 } 3771 3772 /** 3773 * Helper method that offsets a rect either from parent to descendant or 3774 * descendant to parent. 3775 */ 3776 void offsetRectBetweenParentAndChild(View descendant, Rect rect, 3777 boolean offsetFromChildToParent, boolean clipToBounds) { 3778 3779 // already in the same coord system :) 3780 if (descendant == this) { 3781 return; 3782 } 3783 3784 ViewParent theParent = descendant.mParent; 3785 3786 // search and offset up to the parent 3787 while ((theParent != null) 3788 && (theParent instanceof View) 3789 && (theParent != this)) { 3790 3791 if (offsetFromChildToParent) { 3792 rect.offset(descendant.mLeft - descendant.mScrollX, 3793 descendant.mTop - descendant.mScrollY); 3794 if (clipToBounds) { 3795 View p = (View) theParent; 3796 rect.intersect(0, 0, p.mRight - p.mLeft, p.mBottom - p.mTop); 3797 } 3798 } else { 3799 if (clipToBounds) { 3800 View p = (View) theParent; 3801 rect.intersect(0, 0, p.mRight - p.mLeft, p.mBottom - p.mTop); 3802 } 3803 rect.offset(descendant.mScrollX - descendant.mLeft, 3804 descendant.mScrollY - descendant.mTop); 3805 } 3806 3807 descendant = (View) theParent; 3808 theParent = descendant.mParent; 3809 } 3810 3811 // now that we are up to this view, need to offset one more time 3812 // to get into our coordinate space 3813 if (theParent == this) { 3814 if (offsetFromChildToParent) { 3815 rect.offset(descendant.mLeft - descendant.mScrollX, 3816 descendant.mTop - descendant.mScrollY); 3817 } else { 3818 rect.offset(descendant.mScrollX - descendant.mLeft, 3819 descendant.mScrollY - descendant.mTop); 3820 } 3821 } else { 3822 throw new IllegalArgumentException("parameter must be a descendant of this view"); 3823 } 3824 } 3825 3826 /** 3827 * Offset the vertical location of all children of this view by the specified number of pixels. 3828 * 3829 * @param offset the number of pixels to offset 3830 * 3831 * @hide 3832 */ 3833 public void offsetChildrenTopAndBottom(int offset) { 3834 final int count = mChildrenCount; 3835 final View[] children = mChildren; 3836 3837 for (int i = 0; i < count; i++) { 3838 final View v = children[i]; 3839 v.mTop += offset; 3840 v.mBottom += offset; 3841 } 3842 } 3843 3844 /** 3845 * {@inheritDoc} 3846 */ 3847 public boolean getChildVisibleRect(View child, Rect r, android.graphics.Point offset) { 3848 int dx = child.mLeft - mScrollX; 3849 int dy = child.mTop - mScrollY; 3850 if (offset != null) { 3851 offset.x += dx; 3852 offset.y += dy; 3853 } 3854 r.offset(dx, dy); 3855 return r.intersect(0, 0, mRight - mLeft, mBottom - mTop) && 3856 (mParent == null || mParent.getChildVisibleRect(this, r, offset)); 3857 } 3858 3859 /** 3860 * {@inheritDoc} 3861 */ 3862 @Override 3863 public final void layout(int l, int t, int r, int b) { 3864 if (mTransition == null || !mTransition.isChangingLayout()) { 3865 super.layout(l, t, r, b); 3866 } else { 3867 // record the fact that we noop'd it; request layout when transition finishes 3868 mLayoutSuppressed = true; 3869 } 3870 } 3871 3872 /** 3873 * {@inheritDoc} 3874 */ 3875 @Override 3876 protected abstract void onLayout(boolean changed, 3877 int l, int t, int r, int b); 3878 3879 /** 3880 * Indicates whether the view group has the ability to animate its children 3881 * after the first layout. 3882 * 3883 * @return true if the children can be animated, false otherwise 3884 */ 3885 protected boolean canAnimate() { 3886 return mLayoutAnimationController != null; 3887 } 3888 3889 /** 3890 * Runs the layout animation. Calling this method triggers a relayout of 3891 * this view group. 3892 */ 3893 public void startLayoutAnimation() { 3894 if (mLayoutAnimationController != null) { 3895 mGroupFlags |= FLAG_RUN_ANIMATION; 3896 requestLayout(); 3897 } 3898 } 3899 3900 /** 3901 * Schedules the layout animation to be played after the next layout pass 3902 * of this view group. This can be used to restart the layout animation 3903 * when the content of the view group changes or when the activity is 3904 * paused and resumed. 3905 */ 3906 public void scheduleLayoutAnimation() { 3907 mGroupFlags |= FLAG_RUN_ANIMATION; 3908 } 3909 3910 /** 3911 * Sets the layout animation controller used to animate the group's 3912 * children after the first layout. 3913 * 3914 * @param controller the animation controller 3915 */ 3916 public void setLayoutAnimation(LayoutAnimationController controller) { 3917 mLayoutAnimationController = controller; 3918 if (mLayoutAnimationController != null) { 3919 mGroupFlags |= FLAG_RUN_ANIMATION; 3920 } 3921 } 3922 3923 /** 3924 * Returns the layout animation controller used to animate the group's 3925 * children. 3926 * 3927 * @return the current animation controller 3928 */ 3929 public LayoutAnimationController getLayoutAnimation() { 3930 return mLayoutAnimationController; 3931 } 3932 3933 /** 3934 * Indicates whether the children's drawing cache is used during a layout 3935 * animation. By default, the drawing cache is enabled but this will prevent 3936 * nested layout animations from working. To nest animations, you must disable 3937 * the cache. 3938 * 3939 * @return true if the animation cache is enabled, false otherwise 3940 * 3941 * @see #setAnimationCacheEnabled(boolean) 3942 * @see View#setDrawingCacheEnabled(boolean) 3943 */ 3944 @ViewDebug.ExportedProperty 3945 public boolean isAnimationCacheEnabled() { 3946 return (mGroupFlags & FLAG_ANIMATION_CACHE) == FLAG_ANIMATION_CACHE; 3947 } 3948 3949 /** 3950 * Enables or disables the children's drawing cache during a layout animation. 3951 * By default, the drawing cache is enabled but this will prevent nested 3952 * layout animations from working. To nest animations, you must disable the 3953 * cache. 3954 * 3955 * @param enabled true to enable the animation cache, false otherwise 3956 * 3957 * @see #isAnimationCacheEnabled() 3958 * @see View#setDrawingCacheEnabled(boolean) 3959 */ 3960 public void setAnimationCacheEnabled(boolean enabled) { 3961 setBooleanFlag(FLAG_ANIMATION_CACHE, enabled); 3962 } 3963 3964 /** 3965 * Indicates whether this ViewGroup will always try to draw its children using their 3966 * drawing cache. By default this property is enabled. 3967 * 3968 * @return true if the animation cache is enabled, false otherwise 3969 * 3970 * @see #setAlwaysDrawnWithCacheEnabled(boolean) 3971 * @see #setChildrenDrawnWithCacheEnabled(boolean) 3972 * @see View#setDrawingCacheEnabled(boolean) 3973 */ 3974 @ViewDebug.ExportedProperty(category = "drawing") 3975 public boolean isAlwaysDrawnWithCacheEnabled() { 3976 return (mGroupFlags & FLAG_ALWAYS_DRAWN_WITH_CACHE) == FLAG_ALWAYS_DRAWN_WITH_CACHE; 3977 } 3978 3979 /** 3980 * Indicates whether this ViewGroup will always try to draw its children using their 3981 * drawing cache. This property can be set to true when the cache rendering is 3982 * slightly different from the children's normal rendering. Renderings can be different, 3983 * for instance, when the cache's quality is set to low. 3984 * 3985 * When this property is disabled, the ViewGroup will use the drawing cache of its 3986 * children only when asked to. It's usually the task of subclasses to tell ViewGroup 3987 * when to start using the drawing cache and when to stop using it. 3988 * 3989 * @param always true to always draw with the drawing cache, false otherwise 3990 * 3991 * @see #isAlwaysDrawnWithCacheEnabled() 3992 * @see #setChildrenDrawnWithCacheEnabled(boolean) 3993 * @see View#setDrawingCacheEnabled(boolean) 3994 * @see View#setDrawingCacheQuality(int) 3995 */ 3996 public void setAlwaysDrawnWithCacheEnabled(boolean always) { 3997 setBooleanFlag(FLAG_ALWAYS_DRAWN_WITH_CACHE, always); 3998 } 3999 4000 /** 4001 * Indicates whether the ViewGroup is currently drawing its children using 4002 * their drawing cache. 4003 * 4004 * @return true if children should be drawn with their cache, false otherwise 4005 * 4006 * @see #setAlwaysDrawnWithCacheEnabled(boolean) 4007 * @see #setChildrenDrawnWithCacheEnabled(boolean) 4008 */ 4009 @ViewDebug.ExportedProperty(category = "drawing") 4010 protected boolean isChildrenDrawnWithCacheEnabled() { 4011 return (mGroupFlags & FLAG_CHILDREN_DRAWN_WITH_CACHE) == FLAG_CHILDREN_DRAWN_WITH_CACHE; 4012 } 4013 4014 /** 4015 * Tells the ViewGroup to draw its children using their drawing cache. This property 4016 * is ignored when {@link #isAlwaysDrawnWithCacheEnabled()} is true. A child's drawing cache 4017 * will be used only if it has been enabled. 4018 * 4019 * Subclasses should call this method to start and stop using the drawing cache when 4020 * they perform performance sensitive operations, like scrolling or animating. 4021 * 4022 * @param enabled true if children should be drawn with their cache, false otherwise 4023 * 4024 * @see #setAlwaysDrawnWithCacheEnabled(boolean) 4025 * @see #isChildrenDrawnWithCacheEnabled() 4026 */ 4027 protected void setChildrenDrawnWithCacheEnabled(boolean enabled) { 4028 setBooleanFlag(FLAG_CHILDREN_DRAWN_WITH_CACHE, enabled); 4029 } 4030 4031 /** 4032 * Indicates whether the ViewGroup is drawing its children in the order defined by 4033 * {@link #getChildDrawingOrder(int, int)}. 4034 * 4035 * @return true if children drawing order is defined by {@link #getChildDrawingOrder(int, int)}, 4036 * false otherwise 4037 * 4038 * @see #setChildrenDrawingOrderEnabled(boolean) 4039 * @see #getChildDrawingOrder(int, int) 4040 */ 4041 @ViewDebug.ExportedProperty(category = "drawing") 4042 protected boolean isChildrenDrawingOrderEnabled() { 4043 return (mGroupFlags & FLAG_USE_CHILD_DRAWING_ORDER) == FLAG_USE_CHILD_DRAWING_ORDER; 4044 } 4045 4046 /** 4047 * Tells the ViewGroup whether to draw its children in the order defined by the method 4048 * {@link #getChildDrawingOrder(int, int)}. 4049 * 4050 * @param enabled true if the order of the children when drawing is determined by 4051 * {@link #getChildDrawingOrder(int, int)}, false otherwise 4052 * 4053 * @see #isChildrenDrawingOrderEnabled() 4054 * @see #getChildDrawingOrder(int, int) 4055 */ 4056 protected void setChildrenDrawingOrderEnabled(boolean enabled) { 4057 setBooleanFlag(FLAG_USE_CHILD_DRAWING_ORDER, enabled); 4058 } 4059 4060 private void setBooleanFlag(int flag, boolean value) { 4061 if (value) { 4062 mGroupFlags |= flag; 4063 } else { 4064 mGroupFlags &= ~flag; 4065 } 4066 } 4067 4068 /** 4069 * Returns an integer indicating what types of drawing caches are kept in memory. 4070 * 4071 * @see #setPersistentDrawingCache(int) 4072 * @see #setAnimationCacheEnabled(boolean) 4073 * 4074 * @return one or a combination of {@link #PERSISTENT_NO_CACHE}, 4075 * {@link #PERSISTENT_ANIMATION_CACHE}, {@link #PERSISTENT_SCROLLING_CACHE} 4076 * and {@link #PERSISTENT_ALL_CACHES} 4077 */ 4078 @ViewDebug.ExportedProperty(category = "drawing", mapping = { 4079 @ViewDebug.IntToString(from = PERSISTENT_NO_CACHE, to = "NONE"), 4080 @ViewDebug.IntToString(from = PERSISTENT_ANIMATION_CACHE, to = "ANIMATION"), 4081 @ViewDebug.IntToString(from = PERSISTENT_SCROLLING_CACHE, to = "SCROLLING"), 4082 @ViewDebug.IntToString(from = PERSISTENT_ALL_CACHES, to = "ALL") 4083 }) 4084 public int getPersistentDrawingCache() { 4085 return mPersistentDrawingCache; 4086 } 4087 4088 /** 4089 * Indicates what types of drawing caches should be kept in memory after 4090 * they have been created. 4091 * 4092 * @see #getPersistentDrawingCache() 4093 * @see #setAnimationCacheEnabled(boolean) 4094 * 4095 * @param drawingCacheToKeep one or a combination of {@link #PERSISTENT_NO_CACHE}, 4096 * {@link #PERSISTENT_ANIMATION_CACHE}, {@link #PERSISTENT_SCROLLING_CACHE} 4097 * and {@link #PERSISTENT_ALL_CACHES} 4098 */ 4099 public void setPersistentDrawingCache(int drawingCacheToKeep) { 4100 mPersistentDrawingCache = drawingCacheToKeep & PERSISTENT_ALL_CACHES; 4101 } 4102 4103 /** 4104 * Returns a new set of layout parameters based on the supplied attributes set. 4105 * 4106 * @param attrs the attributes to build the layout parameters from 4107 * 4108 * @return an instance of {@link android.view.ViewGroup.LayoutParams} or one 4109 * of its descendants 4110 */ 4111 public LayoutParams generateLayoutParams(AttributeSet attrs) { 4112 return new LayoutParams(getContext(), attrs); 4113 } 4114 4115 /** 4116 * Returns a safe set of layout parameters based on the supplied layout params. 4117 * When a ViewGroup is passed a View whose layout params do not pass the test of 4118 * {@link #checkLayoutParams(android.view.ViewGroup.LayoutParams)}, this method 4119 * is invoked. This method should return a new set of layout params suitable for 4120 * this ViewGroup, possibly by copying the appropriate attributes from the 4121 * specified set of layout params. 4122 * 4123 * @param p The layout parameters to convert into a suitable set of layout parameters 4124 * for this ViewGroup. 4125 * 4126 * @return an instance of {@link android.view.ViewGroup.LayoutParams} or one 4127 * of its descendants 4128 */ 4129 protected LayoutParams generateLayoutParams(ViewGroup.LayoutParams p) { 4130 return p; 4131 } 4132 4133 /** 4134 * Returns a set of default layout parameters. These parameters are requested 4135 * when the View passed to {@link #addView(View)} has no layout parameters 4136 * already set. If null is returned, an exception is thrown from addView. 4137 * 4138 * @return a set of default layout parameters or null 4139 */ 4140 protected LayoutParams generateDefaultLayoutParams() { 4141 return new LayoutParams(LayoutParams.WRAP_CONTENT, LayoutParams.WRAP_CONTENT); 4142 } 4143 4144 /** 4145 * @hide 4146 */ 4147 @Override 4148 protected boolean dispatchConsistencyCheck(int consistency) { 4149 boolean result = super.dispatchConsistencyCheck(consistency); 4150 4151 final int count = mChildrenCount; 4152 final View[] children = mChildren; 4153 for (int i = 0; i < count; i++) { 4154 if (!children[i].dispatchConsistencyCheck(consistency)) result = false; 4155 } 4156 4157 return result; 4158 } 4159 4160 /** 4161 * @hide 4162 */ 4163 @Override 4164 protected boolean onConsistencyCheck(int consistency) { 4165 boolean result = super.onConsistencyCheck(consistency); 4166 4167 final boolean checkLayout = (consistency & ViewDebug.CONSISTENCY_LAYOUT) != 0; 4168 final boolean checkDrawing = (consistency & ViewDebug.CONSISTENCY_DRAWING) != 0; 4169 4170 if (checkLayout) { 4171 final int count = mChildrenCount; 4172 final View[] children = mChildren; 4173 for (int i = 0; i < count; i++) { 4174 if (children[i].getParent() != this) { 4175 result = false; 4176 android.util.Log.d(ViewDebug.CONSISTENCY_LOG_TAG, 4177 "View " + children[i] + " has no parent/a parent that is not " + this); 4178 } 4179 } 4180 } 4181 4182 if (checkDrawing) { 4183 // If this group is dirty, check that the parent is dirty as well 4184 if ((mPrivateFlags & DIRTY_MASK) != 0) { 4185 final ViewParent parent = getParent(); 4186 if (parent != null && !(parent instanceof ViewRoot)) { 4187 if ((((View) parent).mPrivateFlags & DIRTY_MASK) == 0) { 4188 result = false; 4189 android.util.Log.d(ViewDebug.CONSISTENCY_LOG_TAG, 4190 "ViewGroup " + this + " is dirty but its parent is not: " + this); 4191 } 4192 } 4193 } 4194 } 4195 4196 return result; 4197 } 4198 4199 /** 4200 * {@inheritDoc} 4201 */ 4202 @Override 4203 protected void debug(int depth) { 4204 super.debug(depth); 4205 String output; 4206 4207 if (mFocused != null) { 4208 output = debugIndent(depth); 4209 output += "mFocused"; 4210 Log.d(VIEW_LOG_TAG, output); 4211 } 4212 if (mChildrenCount != 0) { 4213 output = debugIndent(depth); 4214 output += "{"; 4215 Log.d(VIEW_LOG_TAG, output); 4216 } 4217 int count = mChildrenCount; 4218 for (int i = 0; i < count; i++) { 4219 View child = mChildren[i]; 4220 child.debug(depth + 1); 4221 } 4222 4223 if (mChildrenCount != 0) { 4224 output = debugIndent(depth); 4225 output += "}"; 4226 Log.d(VIEW_LOG_TAG, output); 4227 } 4228 } 4229 4230 /** 4231 * Returns the position in the group of the specified child view. 4232 * 4233 * @param child the view for which to get the position 4234 * @return a positive integer representing the position of the view in the 4235 * group, or -1 if the view does not exist in the group 4236 */ 4237 public int indexOfChild(View child) { 4238 final int count = mChildrenCount; 4239 final View[] children = mChildren; 4240 for (int i = 0; i < count; i++) { 4241 if (children[i] == child) { 4242 return i; 4243 } 4244 } 4245 return -1; 4246 } 4247 4248 /** 4249 * Returns the number of children in the group. 4250 * 4251 * @return a positive integer representing the number of children in 4252 * the group 4253 */ 4254 public int getChildCount() { 4255 return mChildrenCount; 4256 } 4257 4258 /** 4259 * Returns the view at the specified position in the group. 4260 * 4261 * @param index the position at which to get the view from 4262 * @return the view at the specified position or null if the position 4263 * does not exist within the group 4264 */ 4265 public View getChildAt(int index) { 4266 try { 4267 return mChildren[index]; 4268 } catch (IndexOutOfBoundsException ex) { 4269 return null; 4270 } 4271 } 4272 4273 /** 4274 * Ask all of the children of this view to measure themselves, taking into 4275 * account both the MeasureSpec requirements for this view and its padding. 4276 * We skip children that are in the GONE state The heavy lifting is done in 4277 * getChildMeasureSpec. 4278 * 4279 * @param widthMeasureSpec The width requirements for this view 4280 * @param heightMeasureSpec The height requirements for this view 4281 */ 4282 protected void measureChildren(int widthMeasureSpec, int heightMeasureSpec) { 4283 final int size = mChildrenCount; 4284 final View[] children = mChildren; 4285 for (int i = 0; i < size; ++i) { 4286 final View child = children[i]; 4287 if ((child.mViewFlags & VISIBILITY_MASK) != GONE) { 4288 measureChild(child, widthMeasureSpec, heightMeasureSpec); 4289 } 4290 } 4291 } 4292 4293 /** 4294 * Ask one of the children of this view to measure itself, taking into 4295 * account both the MeasureSpec requirements for this view and its padding. 4296 * The heavy lifting is done in getChildMeasureSpec. 4297 * 4298 * @param child The child to measure 4299 * @param parentWidthMeasureSpec The width requirements for this view 4300 * @param parentHeightMeasureSpec The height requirements for this view 4301 */ 4302 protected void measureChild(View child, int parentWidthMeasureSpec, 4303 int parentHeightMeasureSpec) { 4304 final LayoutParams lp = child.getLayoutParams(); 4305 4306 final int childWidthMeasureSpec = getChildMeasureSpec(parentWidthMeasureSpec, 4307 mPaddingLeft + mPaddingRight, lp.width); 4308 final int childHeightMeasureSpec = getChildMeasureSpec(parentHeightMeasureSpec, 4309 mPaddingTop + mPaddingBottom, lp.height); 4310 4311 child.measure(childWidthMeasureSpec, childHeightMeasureSpec); 4312 } 4313 4314 /** 4315 * Ask one of the children of this view to measure itself, taking into 4316 * account both the MeasureSpec requirements for this view and its padding 4317 * and margins. The child must have MarginLayoutParams The heavy lifting is 4318 * done in getChildMeasureSpec. 4319 * 4320 * @param child The child to measure 4321 * @param parentWidthMeasureSpec The width requirements for this view 4322 * @param widthUsed Extra space that has been used up by the parent 4323 * horizontally (possibly by other children of the parent) 4324 * @param parentHeightMeasureSpec The height requirements for this view 4325 * @param heightUsed Extra space that has been used up by the parent 4326 * vertically (possibly by other children of the parent) 4327 */ 4328 protected void measureChildWithMargins(View child, 4329 int parentWidthMeasureSpec, int widthUsed, 4330 int parentHeightMeasureSpec, int heightUsed) { 4331 final MarginLayoutParams lp = (MarginLayoutParams) child.getLayoutParams(); 4332 4333 final int childWidthMeasureSpec = getChildMeasureSpec(parentWidthMeasureSpec, 4334 mPaddingLeft + mPaddingRight + lp.leftMargin + lp.rightMargin 4335 + widthUsed, lp.width); 4336 final int childHeightMeasureSpec = getChildMeasureSpec(parentHeightMeasureSpec, 4337 mPaddingTop + mPaddingBottom + lp.topMargin + lp.bottomMargin 4338 + heightUsed, lp.height); 4339 4340 child.measure(childWidthMeasureSpec, childHeightMeasureSpec); 4341 } 4342 4343 /** 4344 * Does the hard part of measureChildren: figuring out the MeasureSpec to 4345 * pass to a particular child. This method figures out the right MeasureSpec 4346 * for one dimension (height or width) of one child view. 4347 * 4348 * The goal is to combine information from our MeasureSpec with the 4349 * LayoutParams of the child to get the best possible results. For example, 4350 * if the this view knows its size (because its MeasureSpec has a mode of 4351 * EXACTLY), and the child has indicated in its LayoutParams that it wants 4352 * to be the same size as the parent, the parent should ask the child to 4353 * layout given an exact size. 4354 * 4355 * @param spec The requirements for this view 4356 * @param padding The padding of this view for the current dimension and 4357 * margins, if applicable 4358 * @param childDimension How big the child wants to be in the current 4359 * dimension 4360 * @return a MeasureSpec integer for the child 4361 */ 4362 public static int getChildMeasureSpec(int spec, int padding, int childDimension) { 4363 int specMode = MeasureSpec.getMode(spec); 4364 int specSize = MeasureSpec.getSize(spec); 4365 4366 int size = Math.max(0, specSize - padding); 4367 4368 int resultSize = 0; 4369 int resultMode = 0; 4370 4371 switch (specMode) { 4372 // Parent has imposed an exact size on us 4373 case MeasureSpec.EXACTLY: 4374 if (childDimension >= 0) { 4375 resultSize = childDimension; 4376 resultMode = MeasureSpec.EXACTLY; 4377 } else if (childDimension == LayoutParams.MATCH_PARENT) { 4378 // Child wants to be our size. So be it. 4379 resultSize = size; 4380 resultMode = MeasureSpec.EXACTLY; 4381 } else if (childDimension == LayoutParams.WRAP_CONTENT) { 4382 // Child wants to determine its own size. It can't be 4383 // bigger than us. 4384 resultSize = size; 4385 resultMode = MeasureSpec.AT_MOST; 4386 } 4387 break; 4388 4389 // Parent has imposed a maximum size on us 4390 case MeasureSpec.AT_MOST: 4391 if (childDimension >= 0) { 4392 // Child wants a specific size... so be it 4393 resultSize = childDimension; 4394 resultMode = MeasureSpec.EXACTLY; 4395 } else if (childDimension == LayoutParams.MATCH_PARENT) { 4396 // Child wants to be our size, but our size is not fixed. 4397 // Constrain child to not be bigger than us. 4398 resultSize = size; 4399 resultMode = MeasureSpec.AT_MOST; 4400 } else if (childDimension == LayoutParams.WRAP_CONTENT) { 4401 // Child wants to determine its own size. It can't be 4402 // bigger than us. 4403 resultSize = size; 4404 resultMode = MeasureSpec.AT_MOST; 4405 } 4406 break; 4407 4408 // Parent asked to see how big we want to be 4409 case MeasureSpec.UNSPECIFIED: 4410 if (childDimension >= 0) { 4411 // Child wants a specific size... let him have it 4412 resultSize = childDimension; 4413 resultMode = MeasureSpec.EXACTLY; 4414 } else if (childDimension == LayoutParams.MATCH_PARENT) { 4415 // Child wants to be our size... find out how big it should 4416 // be 4417 resultSize = 0; 4418 resultMode = MeasureSpec.UNSPECIFIED; 4419 } else if (childDimension == LayoutParams.WRAP_CONTENT) { 4420 // Child wants to determine its own size.... find out how 4421 // big it should be 4422 resultSize = 0; 4423 resultMode = MeasureSpec.UNSPECIFIED; 4424 } 4425 break; 4426 } 4427 return MeasureSpec.makeMeasureSpec(resultSize, resultMode); 4428 } 4429 4430 4431 /** 4432 * Removes any pending animations for views that have been removed. Call 4433 * this if you don't want animations for exiting views to stack up. 4434 */ 4435 public void clearDisappearingChildren() { 4436 if (mDisappearingChildren != null) { 4437 mDisappearingChildren.clear(); 4438 } 4439 } 4440 4441 /** 4442 * Add a view which is removed from mChildren but still needs animation 4443 * 4444 * @param v View to add 4445 */ 4446 private void addDisappearingView(View v) { 4447 ArrayList<View> disappearingChildren = mDisappearingChildren; 4448 4449 if (disappearingChildren == null) { 4450 disappearingChildren = mDisappearingChildren = new ArrayList<View>(); 4451 } 4452 4453 disappearingChildren.add(v); 4454 } 4455 4456 /** 4457 * Cleanup a view when its animation is done. This may mean removing it from 4458 * the list of disappearing views. 4459 * 4460 * @param view The view whose animation has finished 4461 * @param animation The animation, cannot be null 4462 */ 4463 private void finishAnimatingView(final View view, Animation animation) { 4464 final ArrayList<View> disappearingChildren = mDisappearingChildren; 4465 if (disappearingChildren != null) { 4466 if (disappearingChildren.contains(view)) { 4467 disappearingChildren.remove(view); 4468 4469 if (view.mAttachInfo != null) { 4470 view.dispatchDetachedFromWindow(); 4471 } 4472 4473 view.clearAnimation(); 4474 mGroupFlags |= FLAG_INVALIDATE_REQUIRED; 4475 } 4476 } 4477 4478 if (animation != null && !animation.getFillAfter()) { 4479 view.clearAnimation(); 4480 } 4481 4482 if ((view.mPrivateFlags & ANIMATION_STARTED) == ANIMATION_STARTED) { 4483 view.onAnimationEnd(); 4484 // Should be performed by onAnimationEnd() but this avoid an infinite loop, 4485 // so we'd rather be safe than sorry 4486 view.mPrivateFlags &= ~ANIMATION_STARTED; 4487 // Draw one more frame after the animation is done 4488 mGroupFlags |= FLAG_INVALIDATE_REQUIRED; 4489 } 4490 } 4491 4492 /** 4493 * This method tells the ViewGroup that the given View object, which should have this 4494 * ViewGroup as its parent, 4495 * should be kept around (re-displayed when the ViewGroup draws its children) even if it 4496 * is removed from its parent. This allows animations, such as those used by 4497 * {@link android.app.Fragment} and {@link android.animation.LayoutTransition} to animate 4498 * the removal of views. A call to this method should always be accompanied by a later call 4499 * to {@link #endViewTransition(View)}, such as after an animation on the View has finished, 4500 * so that the View finally gets removed. 4501 * 4502 * @param view The View object to be kept visible even if it gets removed from its parent. 4503 */ 4504 public void startViewTransition(View view) { 4505 if (view.mParent == this) { 4506 if (mTransitioningViews == null) { 4507 mTransitioningViews = new ArrayList<View>(); 4508 } 4509 mTransitioningViews.add(view); 4510 } 4511 } 4512 4513 /** 4514 * This method should always be called following an earlier call to 4515 * {@link #startViewTransition(View)}. The given View is finally removed from its parent 4516 * and will no longer be displayed. Note that this method does not perform the functionality 4517 * of removing a view from its parent; it just discontinues the display of a View that 4518 * has previously been removed. 4519 * 4520 * @return view The View object that has been removed but is being kept around in the visible 4521 * hierarchy by an earlier call to {@link #startViewTransition(View)}. 4522 */ 4523 public void endViewTransition(View view) { 4524 if (mTransitioningViews != null) { 4525 mTransitioningViews.remove(view); 4526 final ArrayList<View> disappearingChildren = mDisappearingChildren; 4527 if (disappearingChildren != null && disappearingChildren.contains(view)) { 4528 disappearingChildren.remove(view); 4529 if (mVisibilityChangingChildren != null && 4530 mVisibilityChangingChildren.contains(view)) { 4531 mVisibilityChangingChildren.remove(view); 4532 } else { 4533 if (view.mAttachInfo != null) { 4534 view.dispatchDetachedFromWindow(); 4535 } 4536 if (view.mParent != null) { 4537 view.mParent = null; 4538 } 4539 } 4540 mGroupFlags |= FLAG_INVALIDATE_REQUIRED; 4541 } 4542 } 4543 } 4544 4545 private LayoutTransition.TransitionListener mLayoutTransitionListener = 4546 new LayoutTransition.TransitionListener() { 4547 @Override 4548 public void startTransition(LayoutTransition transition, ViewGroup container, 4549 View view, int transitionType) { 4550 // We only care about disappearing items, since we need special logic to keep 4551 // those items visible after they've been 'removed' 4552 if (transitionType == LayoutTransition.DISAPPEARING) { 4553 startViewTransition(view); 4554 } 4555 } 4556 4557 @Override 4558 public void endTransition(LayoutTransition transition, ViewGroup container, 4559 View view, int transitionType) { 4560 if (mLayoutSuppressed && !transition.isChangingLayout()) { 4561 requestLayout(); 4562 mLayoutSuppressed = false; 4563 } 4564 if (transitionType == LayoutTransition.DISAPPEARING && mTransitioningViews != null) { 4565 endViewTransition(view); 4566 } 4567 } 4568 }; 4569 4570 /** 4571 * {@inheritDoc} 4572 */ 4573 @Override 4574 public boolean gatherTransparentRegion(Region region) { 4575 // If no transparent regions requested, we are always opaque. 4576 final boolean meOpaque = (mPrivateFlags & View.REQUEST_TRANSPARENT_REGIONS) == 0; 4577 if (meOpaque && region == null) { 4578 // The caller doesn't care about the region, so stop now. 4579 return true; 4580 } 4581 super.gatherTransparentRegion(region); 4582 final View[] children = mChildren; 4583 final int count = mChildrenCount; 4584 boolean noneOfTheChildrenAreTransparent = true; 4585 for (int i = 0; i < count; i++) { 4586 final View child = children[i]; 4587 if ((child.mViewFlags & VISIBILITY_MASK) == VISIBLE || child.getAnimation() != null) { 4588 if (!child.gatherTransparentRegion(region)) { 4589 noneOfTheChildrenAreTransparent = false; 4590 } 4591 } 4592 } 4593 return meOpaque || noneOfTheChildrenAreTransparent; 4594 } 4595 4596 /** 4597 * {@inheritDoc} 4598 */ 4599 public void requestTransparentRegion(View child) { 4600 if (child != null) { 4601 child.mPrivateFlags |= View.REQUEST_TRANSPARENT_REGIONS; 4602 if (mParent != null) { 4603 mParent.requestTransparentRegion(this); 4604 } 4605 } 4606 } 4607 4608 4609 @Override 4610 protected boolean fitSystemWindows(Rect insets) { 4611 boolean done = super.fitSystemWindows(insets); 4612 if (!done) { 4613 final int count = mChildrenCount; 4614 final View[] children = mChildren; 4615 for (int i = 0; i < count; i++) { 4616 done = children[i].fitSystemWindows(insets); 4617 if (done) { 4618 break; 4619 } 4620 } 4621 } 4622 return done; 4623 } 4624 4625 /** 4626 * Returns the animation listener to which layout animation events are 4627 * sent. 4628 * 4629 * @return an {@link android.view.animation.Animation.AnimationListener} 4630 */ 4631 public Animation.AnimationListener getLayoutAnimationListener() { 4632 return mAnimationListener; 4633 } 4634 4635 @Override 4636 protected void drawableStateChanged() { 4637 super.drawableStateChanged(); 4638 4639 if ((mGroupFlags & FLAG_NOTIFY_CHILDREN_ON_DRAWABLE_STATE_CHANGE) != 0) { 4640 if ((mGroupFlags & FLAG_ADD_STATES_FROM_CHILDREN) != 0) { 4641 throw new IllegalStateException("addStateFromChildren cannot be enabled if a" 4642 + " child has duplicateParentState set to true"); 4643 } 4644 4645 final View[] children = mChildren; 4646 final int count = mChildrenCount; 4647 4648 for (int i = 0; i < count; i++) { 4649 final View child = children[i]; 4650 if ((child.mViewFlags & DUPLICATE_PARENT_STATE) != 0) { 4651 child.refreshDrawableState(); 4652 } 4653 } 4654 } 4655 } 4656 4657 @Override 4658 public void jumpDrawablesToCurrentState() { 4659 super.jumpDrawablesToCurrentState(); 4660 final View[] children = mChildren; 4661 final int count = mChildrenCount; 4662 for (int i = 0; i < count; i++) { 4663 children[i].jumpDrawablesToCurrentState(); 4664 } 4665 } 4666 4667 @Override 4668 protected int[] onCreateDrawableState(int extraSpace) { 4669 if ((mGroupFlags & FLAG_ADD_STATES_FROM_CHILDREN) == 0) { 4670 return super.onCreateDrawableState(extraSpace); 4671 } 4672 4673 int need = 0; 4674 int n = getChildCount(); 4675 for (int i = 0; i < n; i++) { 4676 int[] childState = getChildAt(i).getDrawableState(); 4677 4678 if (childState != null) { 4679 need += childState.length; 4680 } 4681 } 4682 4683 int[] state = super.onCreateDrawableState(extraSpace + need); 4684 4685 for (int i = 0; i < n; i++) { 4686 int[] childState = getChildAt(i).getDrawableState(); 4687 4688 if (childState != null) { 4689 state = mergeDrawableStates(state, childState); 4690 } 4691 } 4692 4693 return state; 4694 } 4695 4696 /** 4697 * Sets whether this ViewGroup's drawable states also include 4698 * its children's drawable states. This is used, for example, to 4699 * make a group appear to be focused when its child EditText or button 4700 * is focused. 4701 */ 4702 public void setAddStatesFromChildren(boolean addsStates) { 4703 if (addsStates) { 4704 mGroupFlags |= FLAG_ADD_STATES_FROM_CHILDREN; 4705 } else { 4706 mGroupFlags &= ~FLAG_ADD_STATES_FROM_CHILDREN; 4707 } 4708 4709 refreshDrawableState(); 4710 } 4711 4712 /** 4713 * Returns whether this ViewGroup's drawable states also include 4714 * its children's drawable states. This is used, for example, to 4715 * make a group appear to be focused when its child EditText or button 4716 * is focused. 4717 */ 4718 public boolean addStatesFromChildren() { 4719 return (mGroupFlags & FLAG_ADD_STATES_FROM_CHILDREN) != 0; 4720 } 4721 4722 /** 4723 * If {link #addStatesFromChildren} is true, refreshes this group's 4724 * drawable state (to include the states from its children). 4725 */ 4726 public void childDrawableStateChanged(View child) { 4727 if ((mGroupFlags & FLAG_ADD_STATES_FROM_CHILDREN) != 0) { 4728 refreshDrawableState(); 4729 } 4730 } 4731 4732 /** 4733 * Specifies the animation listener to which layout animation events must 4734 * be sent. Only 4735 * {@link android.view.animation.Animation.AnimationListener#onAnimationStart(Animation)} 4736 * and 4737 * {@link android.view.animation.Animation.AnimationListener#onAnimationEnd(Animation)} 4738 * are invoked. 4739 * 4740 * @param animationListener the layout animation listener 4741 */ 4742 public void setLayoutAnimationListener(Animation.AnimationListener animationListener) { 4743 mAnimationListener = animationListener; 4744 } 4745 4746 /** 4747 * LayoutParams are used by views to tell their parents how they want to be 4748 * laid out. See 4749 * {@link android.R.styleable#ViewGroup_Layout ViewGroup Layout Attributes} 4750 * for a list of all child view attributes that this class supports. 4751 * 4752 * <p> 4753 * The base LayoutParams class just describes how big the view wants to be 4754 * for both width and height. For each dimension, it can specify one of: 4755 * <ul> 4756 * <li>FILL_PARENT (renamed MATCH_PARENT in API Level 8 and higher), which 4757 * means that the view wants to be as big as its parent (minus padding) 4758 * <li> WRAP_CONTENT, which means that the view wants to be just big enough 4759 * to enclose its content (plus padding) 4760 * <li> an exact number 4761 * </ul> 4762 * There are subclasses of LayoutParams for different subclasses of 4763 * ViewGroup. For example, AbsoluteLayout has its own subclass of 4764 * LayoutParams which adds an X and Y value. 4765 * 4766 * @attr ref android.R.styleable#ViewGroup_Layout_layout_height 4767 * @attr ref android.R.styleable#ViewGroup_Layout_layout_width 4768 */ 4769 public static class LayoutParams { 4770 /** 4771 * Special value for the height or width requested by a View. 4772 * FILL_PARENT means that the view wants to be as big as its parent, 4773 * minus the parent's padding, if any. This value is deprecated 4774 * starting in API Level 8 and replaced by {@link #MATCH_PARENT}. 4775 */ 4776 @SuppressWarnings({"UnusedDeclaration"}) 4777 @Deprecated 4778 public static final int FILL_PARENT = -1; 4779 4780 /** 4781 * Special value for the height or width requested by a View. 4782 * MATCH_PARENT means that the view wants to be as big as its parent, 4783 * minus the parent's padding, if any. Introduced in API Level 8. 4784 */ 4785 public static final int MATCH_PARENT = -1; 4786 4787 /** 4788 * Special value for the height or width requested by a View. 4789 * WRAP_CONTENT means that the view wants to be just large enough to fit 4790 * its own internal content, taking its own padding into account. 4791 */ 4792 public static final int WRAP_CONTENT = -2; 4793 4794 /** 4795 * Information about how wide the view wants to be. Can be one of the 4796 * constants FILL_PARENT (replaced by MATCH_PARENT , 4797 * in API Level 8) or WRAP_CONTENT. or an exact size. 4798 */ 4799 @ViewDebug.ExportedProperty(category = "layout", mapping = { 4800 @ViewDebug.IntToString(from = MATCH_PARENT, to = "MATCH_PARENT"), 4801 @ViewDebug.IntToString(from = WRAP_CONTENT, to = "WRAP_CONTENT") 4802 }) 4803 public int width; 4804 4805 /** 4806 * Information about how tall the view wants to be. Can be one of the 4807 * constants FILL_PARENT (replaced by MATCH_PARENT , 4808 * in API Level 8) or WRAP_CONTENT. or an exact size. 4809 */ 4810 @ViewDebug.ExportedProperty(category = "layout", mapping = { 4811 @ViewDebug.IntToString(from = MATCH_PARENT, to = "MATCH_PARENT"), 4812 @ViewDebug.IntToString(from = WRAP_CONTENT, to = "WRAP_CONTENT") 4813 }) 4814 public int height; 4815 4816 /** 4817 * Used to animate layouts. 4818 */ 4819 public LayoutAnimationController.AnimationParameters layoutAnimationParameters; 4820 4821 /** 4822 * Creates a new set of layout parameters. The values are extracted from 4823 * the supplied attributes set and context. The XML attributes mapped 4824 * to this set of layout parameters are: 4825 * 4826 * <ul> 4827 * <li><code>layout_width</code>: the width, either an exact value, 4828 * {@link #WRAP_CONTENT}, or {@link #FILL_PARENT} (replaced by 4829 * {@link #MATCH_PARENT} in API Level 8)</li> 4830 * <li><code>layout_height</code>: the height, either an exact value, 4831 * {@link #WRAP_CONTENT}, or {@link #FILL_PARENT} (replaced by 4832 * {@link #MATCH_PARENT} in API Level 8)</li> 4833 * </ul> 4834 * 4835 * @param c the application environment 4836 * @param attrs the set of attributes from which to extract the layout 4837 * parameters' values 4838 */ 4839 public LayoutParams(Context c, AttributeSet attrs) { 4840 TypedArray a = c.obtainStyledAttributes(attrs, R.styleable.ViewGroup_Layout); 4841 setBaseAttributes(a, 4842 R.styleable.ViewGroup_Layout_layout_width, 4843 R.styleable.ViewGroup_Layout_layout_height); 4844 a.recycle(); 4845 } 4846 4847 /** 4848 * Creates a new set of layout parameters with the specified width 4849 * and height. 4850 * 4851 * @param width the width, either {@link #WRAP_CONTENT}, 4852 * {@link #FILL_PARENT} (replaced by {@link #MATCH_PARENT} in 4853 * API Level 8), or a fixed size in pixels 4854 * @param height the height, either {@link #WRAP_CONTENT}, 4855 * {@link #FILL_PARENT} (replaced by {@link #MATCH_PARENT} in 4856 * API Level 8), or a fixed size in pixels 4857 */ 4858 public LayoutParams(int width, int height) { 4859 this.width = width; 4860 this.height = height; 4861 } 4862 4863 /** 4864 * Copy constructor. Clones the width and height values of the source. 4865 * 4866 * @param source The layout params to copy from. 4867 */ 4868 public LayoutParams(LayoutParams source) { 4869 this.width = source.width; 4870 this.height = source.height; 4871 } 4872 4873 /** 4874 * Used internally by MarginLayoutParams. 4875 * @hide 4876 */ 4877 LayoutParams() { 4878 } 4879 4880 /** 4881 * Extracts the layout parameters from the supplied attributes. 4882 * 4883 * @param a the style attributes to extract the parameters from 4884 * @param widthAttr the identifier of the width attribute 4885 * @param heightAttr the identifier of the height attribute 4886 */ 4887 protected void setBaseAttributes(TypedArray a, int widthAttr, int heightAttr) { 4888 width = a.getLayoutDimension(widthAttr, "layout_width"); 4889 height = a.getLayoutDimension(heightAttr, "layout_height"); 4890 } 4891 4892 /** 4893 * Returns a String representation of this set of layout parameters. 4894 * 4895 * @param output the String to prepend to the internal representation 4896 * @return a String with the following format: output + 4897 * "ViewGroup.LayoutParams={ width=WIDTH, height=HEIGHT }" 4898 * 4899 * @hide 4900 */ 4901 public String debug(String output) { 4902 return output + "ViewGroup.LayoutParams={ width=" 4903 + sizeToString(width) + ", height=" + sizeToString(height) + " }"; 4904 } 4905 4906 /** 4907 * Converts the specified size to a readable String. 4908 * 4909 * @param size the size to convert 4910 * @return a String instance representing the supplied size 4911 * 4912 * @hide 4913 */ 4914 protected static String sizeToString(int size) { 4915 if (size == WRAP_CONTENT) { 4916 return "wrap-content"; 4917 } 4918 if (size == MATCH_PARENT) { 4919 return "match-parent"; 4920 } 4921 return String.valueOf(size); 4922 } 4923 } 4924 4925 /** 4926 * Per-child layout information for layouts that support margins. 4927 * See 4928 * {@link android.R.styleable#ViewGroup_MarginLayout ViewGroup Margin Layout Attributes} 4929 * for a list of all child view attributes that this class supports. 4930 */ 4931 public static class MarginLayoutParams extends ViewGroup.LayoutParams { 4932 /** 4933 * The left margin in pixels of the child. 4934 */ 4935 @ViewDebug.ExportedProperty(category = "layout") 4936 public int leftMargin; 4937 4938 /** 4939 * The top margin in pixels of the child. 4940 */ 4941 @ViewDebug.ExportedProperty(category = "layout") 4942 public int topMargin; 4943 4944 /** 4945 * The right margin in pixels of the child. 4946 */ 4947 @ViewDebug.ExportedProperty(category = "layout") 4948 public int rightMargin; 4949 4950 /** 4951 * The bottom margin in pixels of the child. 4952 */ 4953 @ViewDebug.ExportedProperty(category = "layout") 4954 public int bottomMargin; 4955 4956 /** 4957 * Creates a new set of layout parameters. The values are extracted from 4958 * the supplied attributes set and context. 4959 * 4960 * @param c the application environment 4961 * @param attrs the set of attributes from which to extract the layout 4962 * parameters' values 4963 */ 4964 public MarginLayoutParams(Context c, AttributeSet attrs) { 4965 super(); 4966 4967 TypedArray a = c.obtainStyledAttributes(attrs, R.styleable.ViewGroup_MarginLayout); 4968 setBaseAttributes(a, 4969 R.styleable.ViewGroup_MarginLayout_layout_width, 4970 R.styleable.ViewGroup_MarginLayout_layout_height); 4971 4972 int margin = a.getDimensionPixelSize( 4973 com.android.internal.R.styleable.ViewGroup_MarginLayout_layout_margin, -1); 4974 if (margin >= 0) { 4975 leftMargin = margin; 4976 topMargin = margin; 4977 rightMargin= margin; 4978 bottomMargin = margin; 4979 } else { 4980 leftMargin = a.getDimensionPixelSize( 4981 R.styleable.ViewGroup_MarginLayout_layout_marginLeft, 0); 4982 topMargin = a.getDimensionPixelSize( 4983 R.styleable.ViewGroup_MarginLayout_layout_marginTop, 0); 4984 rightMargin = a.getDimensionPixelSize( 4985 R.styleable.ViewGroup_MarginLayout_layout_marginRight, 0); 4986 bottomMargin = a.getDimensionPixelSize( 4987 R.styleable.ViewGroup_MarginLayout_layout_marginBottom, 0); 4988 } 4989 4990 a.recycle(); 4991 } 4992 4993 /** 4994 * {@inheritDoc} 4995 */ 4996 public MarginLayoutParams(int width, int height) { 4997 super(width, height); 4998 } 4999 5000 /** 5001 * Copy constructor. Clones the width, height and margin values of the source. 5002 * 5003 * @param source The layout params to copy from. 5004 */ 5005 public MarginLayoutParams(MarginLayoutParams source) { 5006 this.width = source.width; 5007 this.height = source.height; 5008 5009 this.leftMargin = source.leftMargin; 5010 this.topMargin = source.topMargin; 5011 this.rightMargin = source.rightMargin; 5012 this.bottomMargin = source.bottomMargin; 5013 } 5014 5015 /** 5016 * {@inheritDoc} 5017 */ 5018 public MarginLayoutParams(LayoutParams source) { 5019 super(source); 5020 } 5021 5022 /** 5023 * Sets the margins, in pixels. 5024 * 5025 * @param left the left margin size 5026 * @param top the top margin size 5027 * @param right the right margin size 5028 * @param bottom the bottom margin size 5029 * 5030 * @attr ref android.R.styleable#ViewGroup_MarginLayout_layout_marginLeft 5031 * @attr ref android.R.styleable#ViewGroup_MarginLayout_layout_marginTop 5032 * @attr ref android.R.styleable#ViewGroup_MarginLayout_layout_marginRight 5033 * @attr ref android.R.styleable#ViewGroup_MarginLayout_layout_marginBottom 5034 */ 5035 public void setMargins(int left, int top, int right, int bottom) { 5036 leftMargin = left; 5037 topMargin = top; 5038 rightMargin = right; 5039 bottomMargin = bottom; 5040 } 5041 } 5042 5043 /* Describes a touched view and the ids of the pointers that it has captured. 5044 * 5045 * This code assumes that pointer ids are always in the range 0..31 such that 5046 * it can use a bitfield to track which pointer ids are present. 5047 * As it happens, the lower layers of the input dispatch pipeline also use the 5048 * same trick so the assumption should be safe here... 5049 */ 5050 private static final class TouchTarget { 5051 private static final int MAX_RECYCLED = 32; 5052 private static final Object sRecycleLock = new Object(); 5053 private static TouchTarget sRecycleBin; 5054 private static int sRecycledCount; 5055 5056 public static final int ALL_POINTER_IDS = -1; // all ones 5057 5058 // The touched child view. 5059 public View child; 5060 5061 // The combined bit mask of pointer ids for all pointers captured by the target. 5062 public int pointerIdBits; 5063 5064 // The next target in the target list. 5065 public TouchTarget next; 5066 5067 private TouchTarget() { 5068 } 5069 5070 public static TouchTarget obtain(View child, int pointerIdBits) { 5071 final TouchTarget target; 5072 synchronized (sRecycleLock) { 5073 if (sRecycleBin == null) { 5074 target = new TouchTarget(); 5075 } else { 5076 target = sRecycleBin; 5077 sRecycleBin = target.next; 5078 sRecycledCount--; 5079 target.next = null; 5080 } 5081 } 5082 target.child = child; 5083 target.pointerIdBits = pointerIdBits; 5084 return target; 5085 } 5086 5087 public void recycle() { 5088 synchronized (sRecycleLock) { 5089 if (sRecycledCount < MAX_RECYCLED) { 5090 next = sRecycleBin; 5091 sRecycleBin = this; 5092 sRecycledCount += 1; 5093 } else { 5094 next = null; 5095 } 5096 child = null; 5097 } 5098 } 5099 } 5100} 5101