ViewGroup.java revision 2ff6d70521fe1f537f8ebd631f0b9b3aa8becf94
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 com.android.internal.R; 21import com.android.internal.util.Predicate; 22 23import android.content.Context; 24import android.content.res.Configuration; 25import android.content.res.TypedArray; 26import android.graphics.Bitmap; 27import android.graphics.Canvas; 28import android.graphics.Matrix; 29import android.graphics.Paint; 30import android.graphics.PointF; 31import android.graphics.Rect; 32import android.graphics.RectF; 33import android.graphics.Region; 34import android.os.Build; 35import android.os.Parcelable; 36import android.os.SystemClock; 37import android.util.AttributeSet; 38import android.util.Log; 39import android.util.SparseArray; 40import android.view.accessibility.AccessibilityEvent; 41import android.view.animation.Animation; 42import android.view.animation.AnimationUtils; 43import android.view.animation.LayoutAnimationController; 44import android.view.animation.Transformation; 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 public ViewGroup(Context context) { 350 super(context); 351 initViewGroup(); 352 } 353 354 public ViewGroup(Context context, AttributeSet attrs) { 355 super(context, attrs); 356 initViewGroup(); 357 initFromAttributes(context, attrs); 358 } 359 360 public ViewGroup(Context context, AttributeSet attrs, int defStyle) { 361 super(context, attrs, defStyle); 362 initViewGroup(); 363 initFromAttributes(context, attrs); 364 } 365 366 private void initViewGroup() { 367 // ViewGroup doesn't draw by default 368 setFlags(WILL_NOT_DRAW, DRAW_MASK); 369 mGroupFlags |= FLAG_CLIP_CHILDREN; 370 mGroupFlags |= FLAG_CLIP_TO_PADDING; 371 mGroupFlags |= FLAG_ANIMATION_DONE; 372 mGroupFlags |= FLAG_ANIMATION_CACHE; 373 mGroupFlags |= FLAG_ALWAYS_DRAWN_WITH_CACHE; 374 375 if (mContext.getApplicationInfo().targetSdkVersion >= Build.VERSION_CODES.HONEYCOMB) { 376 mGroupFlags |= FLAG_SPLIT_MOTION_EVENTS; 377 } 378 379 setDescendantFocusability(FOCUS_BEFORE_DESCENDANTS); 380 381 mChildren = new View[ARRAY_INITIAL_CAPACITY]; 382 mChildrenCount = 0; 383 384 mCachePaint.setDither(false); 385 386 mPersistentDrawingCache = PERSISTENT_SCROLLING_CACHE; 387 } 388 389 private void initFromAttributes(Context context, AttributeSet attrs) { 390 TypedArray a = context.obtainStyledAttributes(attrs, 391 R.styleable.ViewGroup); 392 393 final int N = a.getIndexCount(); 394 for (int i = 0; i < N; i++) { 395 int attr = a.getIndex(i); 396 switch (attr) { 397 case R.styleable.ViewGroup_clipChildren: 398 setClipChildren(a.getBoolean(attr, true)); 399 break; 400 case R.styleable.ViewGroup_clipToPadding: 401 setClipToPadding(a.getBoolean(attr, true)); 402 break; 403 case R.styleable.ViewGroup_animationCache: 404 setAnimationCacheEnabled(a.getBoolean(attr, true)); 405 break; 406 case R.styleable.ViewGroup_persistentDrawingCache: 407 setPersistentDrawingCache(a.getInt(attr, PERSISTENT_SCROLLING_CACHE)); 408 break; 409 case R.styleable.ViewGroup_addStatesFromChildren: 410 setAddStatesFromChildren(a.getBoolean(attr, false)); 411 break; 412 case R.styleable.ViewGroup_alwaysDrawnWithCache: 413 setAlwaysDrawnWithCacheEnabled(a.getBoolean(attr, true)); 414 break; 415 case R.styleable.ViewGroup_layoutAnimation: 416 int id = a.getResourceId(attr, -1); 417 if (id > 0) { 418 setLayoutAnimation(AnimationUtils.loadLayoutAnimation(mContext, id)); 419 } 420 break; 421 case R.styleable.ViewGroup_descendantFocusability: 422 setDescendantFocusability(DESCENDANT_FOCUSABILITY_FLAGS[a.getInt(attr, 0)]); 423 break; 424 case R.styleable.ViewGroup_splitMotionEvents: 425 setMotionEventSplittingEnabled(a.getBoolean(attr, false)); 426 break; 427 case R.styleable.ViewGroup_animateLayoutChanges: 428 boolean animateLayoutChanges = a.getBoolean(attr, false); 429 if (animateLayoutChanges) { 430 setLayoutTransition(new LayoutTransition()); 431 } 432 break; 433 } 434 } 435 436 a.recycle(); 437 } 438 439 /** 440 * Gets the descendant focusability of this view group. The descendant 441 * focusability defines the relationship between this view group and its 442 * descendants when looking for a view to take focus in 443 * {@link #requestFocus(int, android.graphics.Rect)}. 444 * 445 * @return one of {@link #FOCUS_BEFORE_DESCENDANTS}, {@link #FOCUS_AFTER_DESCENDANTS}, 446 * {@link #FOCUS_BLOCK_DESCENDANTS}. 447 */ 448 @ViewDebug.ExportedProperty(category = "focus", mapping = { 449 @ViewDebug.IntToString(from = FOCUS_BEFORE_DESCENDANTS, to = "FOCUS_BEFORE_DESCENDANTS"), 450 @ViewDebug.IntToString(from = FOCUS_AFTER_DESCENDANTS, to = "FOCUS_AFTER_DESCENDANTS"), 451 @ViewDebug.IntToString(from = FOCUS_BLOCK_DESCENDANTS, to = "FOCUS_BLOCK_DESCENDANTS") 452 }) 453 public int getDescendantFocusability() { 454 return mGroupFlags & FLAG_MASK_FOCUSABILITY; 455 } 456 457 /** 458 * Set the descendant focusability of this view group. This defines the relationship 459 * between this view group and its descendants when looking for a view to 460 * take focus in {@link #requestFocus(int, android.graphics.Rect)}. 461 * 462 * @param focusability one of {@link #FOCUS_BEFORE_DESCENDANTS}, {@link #FOCUS_AFTER_DESCENDANTS}, 463 * {@link #FOCUS_BLOCK_DESCENDANTS}. 464 */ 465 public void setDescendantFocusability(int focusability) { 466 switch (focusability) { 467 case FOCUS_BEFORE_DESCENDANTS: 468 case FOCUS_AFTER_DESCENDANTS: 469 case FOCUS_BLOCK_DESCENDANTS: 470 break; 471 default: 472 throw new IllegalArgumentException("must be one of FOCUS_BEFORE_DESCENDANTS, " 473 + "FOCUS_AFTER_DESCENDANTS, FOCUS_BLOCK_DESCENDANTS"); 474 } 475 mGroupFlags &= ~FLAG_MASK_FOCUSABILITY; 476 mGroupFlags |= (focusability & FLAG_MASK_FOCUSABILITY); 477 } 478 479 /** 480 * {@inheritDoc} 481 */ 482 @Override 483 void handleFocusGainInternal(int direction, Rect previouslyFocusedRect) { 484 if (mFocused != null) { 485 mFocused.unFocus(); 486 mFocused = null; 487 } 488 super.handleFocusGainInternal(direction, previouslyFocusedRect); 489 } 490 491 /** 492 * {@inheritDoc} 493 */ 494 public void requestChildFocus(View child, View focused) { 495 if (DBG) { 496 System.out.println(this + " requestChildFocus()"); 497 } 498 if (getDescendantFocusability() == FOCUS_BLOCK_DESCENDANTS) { 499 return; 500 } 501 502 // Unfocus us, if necessary 503 super.unFocus(); 504 505 // We had a previous notion of who had focus. Clear it. 506 if (mFocused != child) { 507 if (mFocused != null) { 508 mFocused.unFocus(); 509 } 510 511 mFocused = child; 512 } 513 if (mParent != null) { 514 mParent.requestChildFocus(this, focused); 515 } 516 } 517 518 /** 519 * {@inheritDoc} 520 */ 521 public void focusableViewAvailable(View v) { 522 if (mParent != null 523 // shortcut: don't report a new focusable view if we block our descendants from 524 // getting focus 525 && (getDescendantFocusability() != FOCUS_BLOCK_DESCENDANTS) 526 // shortcut: don't report a new focusable view if we already are focused 527 // (and we don't prefer our descendants) 528 // 529 // note: knowing that mFocused is non-null is not a good enough reason 530 // to break the traversal since in that case we'd actually have to find 531 // the focused view and make sure it wasn't FOCUS_AFTER_DESCENDANTS and 532 // an ancestor of v; this will get checked for at ViewRoot 533 && !(isFocused() && getDescendantFocusability() != FOCUS_AFTER_DESCENDANTS)) { 534 mParent.focusableViewAvailable(v); 535 } 536 } 537 538 /** 539 * {@inheritDoc} 540 */ 541 public boolean showContextMenuForChild(View originalView) { 542 return mParent != null && mParent.showContextMenuForChild(originalView); 543 } 544 545 /** 546 * {@inheritDoc} 547 */ 548 public ActionMode startActionModeForChild(View originalView, ActionMode.Callback callback) { 549 return mParent != null ? mParent.startActionModeForChild(originalView, callback) : null; 550 } 551 552 /** 553 * Find the nearest view in the specified direction that wants to take 554 * focus. 555 * 556 * @param focused The view that currently has focus 557 * @param direction One of FOCUS_UP, FOCUS_DOWN, FOCUS_LEFT, and 558 * FOCUS_RIGHT, or 0 for not applicable. 559 */ 560 public View focusSearch(View focused, int direction) { 561 if (isRootNamespace()) { 562 // root namespace means we should consider ourselves the top of the 563 // tree for focus searching; otherwise we could be focus searching 564 // into other tabs. see LocalActivityManager and TabHost for more info 565 return FocusFinder.getInstance().findNextFocus(this, focused, direction); 566 } else if (mParent != null) { 567 return mParent.focusSearch(focused, direction); 568 } 569 return null; 570 } 571 572 /** 573 * {@inheritDoc} 574 */ 575 public boolean requestChildRectangleOnScreen(View child, Rect rectangle, boolean immediate) { 576 return false; 577 } 578 579 /** 580 * {@inheritDoc} 581 */ 582 @Override 583 public boolean dispatchUnhandledMove(View focused, int direction) { 584 return mFocused != null && 585 mFocused.dispatchUnhandledMove(focused, direction); 586 } 587 588 /** 589 * {@inheritDoc} 590 */ 591 public void clearChildFocus(View child) { 592 if (DBG) { 593 System.out.println(this + " clearChildFocus()"); 594 } 595 596 mFocused = null; 597 if (mParent != null) { 598 mParent.clearChildFocus(this); 599 } 600 } 601 602 /** 603 * {@inheritDoc} 604 */ 605 @Override 606 public void clearFocus() { 607 super.clearFocus(); 608 609 // clear any child focus if it exists 610 if (mFocused != null) { 611 mFocused.clearFocus(); 612 } 613 } 614 615 /** 616 * {@inheritDoc} 617 */ 618 @Override 619 void unFocus() { 620 if (DBG) { 621 System.out.println(this + " unFocus()"); 622 } 623 624 super.unFocus(); 625 if (mFocused != null) { 626 mFocused.unFocus(); 627 } 628 mFocused = null; 629 } 630 631 /** 632 * Returns the focused child of this view, if any. The child may have focus 633 * or contain focus. 634 * 635 * @return the focused child or null. 636 */ 637 public View getFocusedChild() { 638 return mFocused; 639 } 640 641 /** 642 * Returns true if this view has or contains focus 643 * 644 * @return true if this view has or contains focus 645 */ 646 @Override 647 public boolean hasFocus() { 648 return (mPrivateFlags & FOCUSED) != 0 || mFocused != null; 649 } 650 651 /* 652 * (non-Javadoc) 653 * 654 * @see android.view.View#findFocus() 655 */ 656 @Override 657 public View findFocus() { 658 if (DBG) { 659 System.out.println("Find focus in " + this + ": flags=" 660 + isFocused() + ", child=" + mFocused); 661 } 662 663 if (isFocused()) { 664 return this; 665 } 666 667 if (mFocused != null) { 668 return mFocused.findFocus(); 669 } 670 return null; 671 } 672 673 /** 674 * {@inheritDoc} 675 */ 676 @Override 677 public boolean hasFocusable() { 678 if ((mViewFlags & VISIBILITY_MASK) != VISIBLE) { 679 return false; 680 } 681 682 if (isFocusable()) { 683 return true; 684 } 685 686 final int descendantFocusability = getDescendantFocusability(); 687 if (descendantFocusability != FOCUS_BLOCK_DESCENDANTS) { 688 final int count = mChildrenCount; 689 final View[] children = mChildren; 690 691 for (int i = 0; i < count; i++) { 692 final View child = children[i]; 693 if (child.hasFocusable()) { 694 return true; 695 } 696 } 697 } 698 699 return false; 700 } 701 702 /** 703 * {@inheritDoc} 704 */ 705 @Override 706 public void addFocusables(ArrayList<View> views, int direction) { 707 addFocusables(views, direction, FOCUSABLES_TOUCH_MODE); 708 } 709 710 /** 711 * {@inheritDoc} 712 */ 713 @Override 714 public void addFocusables(ArrayList<View> views, int direction, int focusableMode) { 715 final int focusableCount = views.size(); 716 717 final int descendantFocusability = getDescendantFocusability(); 718 719 if (descendantFocusability != FOCUS_BLOCK_DESCENDANTS) { 720 final int count = mChildrenCount; 721 final View[] children = mChildren; 722 723 for (int i = 0; i < count; i++) { 724 final View child = children[i]; 725 if ((child.mViewFlags & VISIBILITY_MASK) == VISIBLE) { 726 child.addFocusables(views, direction, focusableMode); 727 } 728 } 729 } 730 731 // we add ourselves (if focusable) in all cases except for when we are 732 // FOCUS_AFTER_DESCENDANTS and there are some descendants focusable. this is 733 // to avoid the focus search finding layouts when a more precise search 734 // among the focusable children would be more interesting. 735 if ( 736 descendantFocusability != FOCUS_AFTER_DESCENDANTS || 737 // No focusable descendants 738 (focusableCount == views.size())) { 739 super.addFocusables(views, direction, focusableMode); 740 } 741 } 742 743 /** 744 * {@inheritDoc} 745 */ 746 @Override 747 public void dispatchWindowFocusChanged(boolean hasFocus) { 748 super.dispatchWindowFocusChanged(hasFocus); 749 final int count = mChildrenCount; 750 final View[] children = mChildren; 751 for (int i = 0; i < count; i++) { 752 children[i].dispatchWindowFocusChanged(hasFocus); 753 } 754 } 755 756 /** 757 * {@inheritDoc} 758 */ 759 @Override 760 public void addTouchables(ArrayList<View> views) { 761 super.addTouchables(views); 762 763 final int count = mChildrenCount; 764 final View[] children = mChildren; 765 766 for (int i = 0; i < count; i++) { 767 final View child = children[i]; 768 if ((child.mViewFlags & VISIBILITY_MASK) == VISIBLE) { 769 child.addTouchables(views); 770 } 771 } 772 } 773 774 /** 775 * {@inheritDoc} 776 */ 777 @Override 778 public void dispatchDisplayHint(int hint) { 779 super.dispatchDisplayHint(hint); 780 final int count = mChildrenCount; 781 final View[] children = mChildren; 782 for (int i = 0; i < count; i++) { 783 children[i].dispatchDisplayHint(hint); 784 } 785 } 786 787 /** 788 * @hide 789 * @param child 790 * @param visibility 791 */ 792 void onChildVisibilityChanged(View child, int visibility) { 793 if (mTransition != null) { 794 if (visibility == VISIBLE) { 795 mTransition.showChild(this, child); 796 } else { 797 mTransition.hideChild(this, child); 798 } 799 if (visibility != VISIBLE) { 800 // Only track this on disappearing views - appearing views are already visible 801 // and don't need special handling during drawChild() 802 if (mVisibilityChangingChildren == null) { 803 mVisibilityChangingChildren = new ArrayList<View>(); 804 } 805 mVisibilityChangingChildren.add(child); 806 if (mTransitioningViews != null && mTransitioningViews.contains(child)) { 807 addDisappearingView(child); 808 } 809 } 810 } 811 812 // in all cases, for drags 813 if (mCurrentDrag != null) { 814 if (visibility == VISIBLE) { 815 notifyChildOfDrag(child); 816 } 817 } 818 } 819 820 /** 821 * {@inheritDoc} 822 */ 823 @Override 824 protected void dispatchVisibilityChanged(View changedView, int visibility) { 825 super.dispatchVisibilityChanged(changedView, visibility); 826 final int count = mChildrenCount; 827 final View[] children = mChildren; 828 for (int i = 0; i < count; i++) { 829 children[i].dispatchVisibilityChanged(changedView, visibility); 830 } 831 } 832 833 /** 834 * {@inheritDoc} 835 */ 836 @Override 837 public void dispatchWindowVisibilityChanged(int visibility) { 838 super.dispatchWindowVisibilityChanged(visibility); 839 final int count = mChildrenCount; 840 final View[] children = mChildren; 841 for (int i = 0; i < count; i++) { 842 children[i].dispatchWindowVisibilityChanged(visibility); 843 } 844 } 845 846 /** 847 * {@inheritDoc} 848 */ 849 @Override 850 public void dispatchConfigurationChanged(Configuration newConfig) { 851 super.dispatchConfigurationChanged(newConfig); 852 final int count = mChildrenCount; 853 final View[] children = mChildren; 854 for (int i = 0; i < count; i++) { 855 children[i].dispatchConfigurationChanged(newConfig); 856 } 857 } 858 859 /** 860 * {@inheritDoc} 861 */ 862 public void recomputeViewAttributes(View child) { 863 if (mAttachInfo != null && !mAttachInfo.mRecomputeGlobalAttributes) { 864 ViewParent parent = mParent; 865 if (parent != null) parent.recomputeViewAttributes(this); 866 } 867 } 868 869 @Override 870 void dispatchCollectViewAttributes(int visibility) { 871 visibility |= mViewFlags&VISIBILITY_MASK; 872 super.dispatchCollectViewAttributes(visibility); 873 final int count = mChildrenCount; 874 final View[] children = mChildren; 875 for (int i = 0; i < count; i++) { 876 children[i].dispatchCollectViewAttributes(visibility); 877 } 878 } 879 880 /** 881 * {@inheritDoc} 882 */ 883 public void bringChildToFront(View child) { 884 int index = indexOfChild(child); 885 if (index >= 0) { 886 removeFromArray(index); 887 addInArray(child, mChildrenCount); 888 child.mParent = this; 889 } 890 } 891 892 /** 893 * {@inheritDoc} 894 * 895 * !!! TODO: write real docs 896 */ 897 @Override 898 public boolean dispatchDragEvent(DragEvent event) { 899 boolean retval = false; 900 final float tx = event.mX; 901 final float ty = event.mY; 902 903 ViewRoot root = getViewRoot(); 904 905 // Dispatch down the view hierarchy 906 switch (event.mAction) { 907 case DragEvent.ACTION_DRAG_STARTED: { 908 // clear state to recalculate which views we drag over 909 mCurrentDragView = null; 910 911 // Set up our tracking of drag-started notifications 912 mCurrentDrag = DragEvent.obtain(event); 913 if (mDragNotifiedChildren == null) { 914 mDragNotifiedChildren = new HashSet<View>(); 915 } else { 916 mDragNotifiedChildren.clear(); 917 } 918 919 // Now dispatch down to our children, caching the responses 920 mChildAcceptsDrag = false; 921 final int count = mChildrenCount; 922 final View[] children = mChildren; 923 for (int i = 0; i < count; i++) { 924 final View child = children[i]; 925 if (child.getVisibility() == VISIBLE) { 926 final boolean handled = notifyChildOfDrag(children[i]); 927 if (handled) { 928 mChildAcceptsDrag = true; 929 } 930 } 931 } 932 933 // Return HANDLED if one of our children can accept the drag 934 if (mChildAcceptsDrag) { 935 retval = true; 936 } 937 } break; 938 939 case DragEvent.ACTION_DRAG_ENDED: { 940 // Release the bookkeeping now that the drag lifecycle has ended 941 if (mDragNotifiedChildren != null) { 942 for (View child : mDragNotifiedChildren) { 943 // If a child was notified about an ongoing drag, it's told that it's over 944 child.dispatchDragEvent(event); 945 } 946 947 mDragNotifiedChildren.clear(); 948 mCurrentDrag.recycle(); 949 mCurrentDrag = null; 950 } 951 952 // We consider drag-ended to have been handled if one of our children 953 // had offered to handle the drag. 954 if (mChildAcceptsDrag) { 955 retval = true; 956 } 957 } break; 958 959 case DragEvent.ACTION_DRAG_LOCATION: { 960 // Find the [possibly new] drag target 961 final View target = findFrontmostDroppableChildAt(event.mX, event.mY, mLocalPoint); 962 963 // If we've changed apparent drag target, tell the view root which view 964 // we're over now [for purposes of the eventual drag-recipient-changed 965 // notifications to the framework] and tell the new target that the drag 966 // has entered its bounds. The root will see setDragFocus() calls all 967 // the way down to the final leaf view that is handling the LOCATION event 968 // before reporting the new potential recipient to the framework. 969 if (mCurrentDragView != target) { 970 root.setDragFocus(target); 971 972 final int action = event.mAction; 973 // If we've dragged off of a child view, send it the EXITED message 974 if (mCurrentDragView != null) { 975 event.mAction = DragEvent.ACTION_DRAG_EXITED; 976 mCurrentDragView.dispatchDragEvent(event); 977 } 978 mCurrentDragView = target; 979 980 // If we've dragged over a new child view, send it the ENTERED message 981 if (target != null) { 982 event.mAction = DragEvent.ACTION_DRAG_ENTERED; 983 target.dispatchDragEvent(event); 984 } 985 event.mAction = action; // restore the event's original state 986 } 987 988 // Dispatch the actual drag location notice, localized into its coordinates 989 if (target != null) { 990 event.mX = mLocalPoint.x; 991 event.mY = mLocalPoint.y; 992 993 retval = target.dispatchDragEvent(event); 994 995 event.mX = tx; 996 event.mY = ty; 997 } 998 } break; 999 1000 /* Entered / exited dispatch 1001 * 1002 * DRAG_ENTERED is not dispatched downwards from ViewGroup. The reason for this is 1003 * that we're about to get the corresponding LOCATION event, which we will use to 1004 * determine which of our children is the new target; at that point we will 1005 * push a DRAG_ENTERED down to the new target child [which may itself be a ViewGroup]. 1006 * 1007 * DRAG_EXITED *is* dispatched all the way down immediately: once we know the 1008 * drag has left this ViewGroup, we know by definition that every contained subview 1009 * is also no longer under the drag point. 1010 */ 1011 1012 case DragEvent.ACTION_DRAG_EXITED: { 1013 if (mCurrentDragView != null) { 1014 mCurrentDragView.dispatchDragEvent(event); 1015 mCurrentDragView = null; 1016 } 1017 } break; 1018 1019 case DragEvent.ACTION_DROP: { 1020 if (ViewDebug.DEBUG_DRAG) Log.d(View.VIEW_LOG_TAG, "Drop event: " + event); 1021 View target = findFrontmostDroppableChildAt(event.mX, event.mY, mLocalPoint); 1022 if (target != null) { 1023 if (ViewDebug.DEBUG_DRAG) Log.d(View.VIEW_LOG_TAG, " dispatch drop to " + target); 1024 event.mX = mLocalPoint.x; 1025 event.mY = mLocalPoint.y; 1026 retval = target.dispatchDragEvent(event); 1027 event.mX = tx; 1028 event.mY = ty; 1029 } else { 1030 if (ViewDebug.DEBUG_DRAG) { 1031 Log.d(View.VIEW_LOG_TAG, " not dropped on an accepting view"); 1032 } 1033 } 1034 } break; 1035 } 1036 1037 // If none of our children could handle the event, try here 1038 if (!retval) { 1039 // Call up to the View implementation that dispatches to installed listeners 1040 retval = super.dispatchDragEvent(event); 1041 } 1042 return retval; 1043 } 1044 1045 // Find the frontmost child view that lies under the given point, and calculate 1046 // the position within its own local coordinate system. 1047 View findFrontmostDroppableChildAt(float x, float y, PointF outLocalPoint) { 1048 final int count = mChildrenCount; 1049 final View[] children = mChildren; 1050 for (int i = count - 1; i >= 0; i--) { 1051 final View child = children[i]; 1052 if (!child.mCanAcceptDrop) { 1053 continue; 1054 } 1055 1056 if (isTransformedTouchPointInView(x, y, child, outLocalPoint)) { 1057 return child; 1058 } 1059 } 1060 return null; 1061 } 1062 1063 boolean notifyChildOfDrag(View child) { 1064 if (ViewDebug.DEBUG_DRAG) { 1065 Log.d(View.VIEW_LOG_TAG, "Sending drag-started to view: " + child); 1066 } 1067 1068 if (! mDragNotifiedChildren.contains(child)) { 1069 mDragNotifiedChildren.add(child); 1070 child.mCanAcceptDrop = child.dispatchDragEvent(mCurrentDrag); 1071 } 1072 return child.mCanAcceptDrop; 1073 } 1074 1075 @Override 1076 public void dispatchSystemUiVisibilityChanged(int visible) { 1077 super.dispatchSystemUiVisibilityChanged(visible); 1078 1079 final int count = mChildrenCount; 1080 final View[] children = mChildren; 1081 for (int i=0; i <count; i++) { 1082 final View child = children[i]; 1083 child.dispatchSystemUiVisibilityChanged(visible); 1084 } 1085 } 1086 1087 /** 1088 * {@inheritDoc} 1089 */ 1090 @Override 1091 public boolean dispatchKeyEventPreIme(KeyEvent event) { 1092 if ((mPrivateFlags & (FOCUSED | HAS_BOUNDS)) == (FOCUSED | HAS_BOUNDS)) { 1093 return super.dispatchKeyEventPreIme(event); 1094 } else if (mFocused != null && (mFocused.mPrivateFlags & HAS_BOUNDS) == HAS_BOUNDS) { 1095 return mFocused.dispatchKeyEventPreIme(event); 1096 } 1097 return false; 1098 } 1099 1100 /** 1101 * {@inheritDoc} 1102 */ 1103 @Override 1104 public boolean dispatchKeyEvent(KeyEvent event) { 1105 if ((mPrivateFlags & (FOCUSED | HAS_BOUNDS)) == (FOCUSED | HAS_BOUNDS)) { 1106 return super.dispatchKeyEvent(event); 1107 } else if (mFocused != null && (mFocused.mPrivateFlags & HAS_BOUNDS) == HAS_BOUNDS) { 1108 return mFocused.dispatchKeyEvent(event); 1109 } 1110 return false; 1111 } 1112 1113 /** 1114 * {@inheritDoc} 1115 */ 1116 @Override 1117 public boolean dispatchKeyShortcutEvent(KeyEvent event) { 1118 if ((mPrivateFlags & (FOCUSED | HAS_BOUNDS)) == (FOCUSED | HAS_BOUNDS)) { 1119 return super.dispatchKeyShortcutEvent(event); 1120 } else if (mFocused != null && (mFocused.mPrivateFlags & HAS_BOUNDS) == HAS_BOUNDS) { 1121 return mFocused.dispatchKeyShortcutEvent(event); 1122 } 1123 return false; 1124 } 1125 1126 /** 1127 * {@inheritDoc} 1128 */ 1129 @Override 1130 public boolean dispatchTrackballEvent(MotionEvent event) { 1131 if ((mPrivateFlags & (FOCUSED | HAS_BOUNDS)) == (FOCUSED | HAS_BOUNDS)) { 1132 return super.dispatchTrackballEvent(event); 1133 } else if (mFocused != null && (mFocused.mPrivateFlags & HAS_BOUNDS) == HAS_BOUNDS) { 1134 return mFocused.dispatchTrackballEvent(event); 1135 } 1136 return false; 1137 } 1138 1139 /** 1140 * {@inheritDoc} 1141 */ 1142 @Override 1143 public boolean dispatchTouchEvent(MotionEvent ev) { 1144 if (!onFilterTouchEventForSecurity(ev)) { 1145 return false; 1146 } 1147 1148 final int action = ev.getAction(); 1149 final int actionMasked = action & MotionEvent.ACTION_MASK; 1150 1151 // Handle an initial down. 1152 if (actionMasked == MotionEvent.ACTION_DOWN) { 1153 // Throw away all previous state when starting a new touch gesture. 1154 // The framework may have dropped the up or cancel event for the previous gesture 1155 // due to an app switch, ANR, or some other state change. 1156 cancelAndClearTouchTargets(ev); 1157 resetTouchState(); 1158 } 1159 1160 // Check for interception. 1161 final boolean intercepted; 1162 if (actionMasked == MotionEvent.ACTION_DOWN || mFirstTouchTarget != null) { 1163 final boolean disallowIntercept = (mGroupFlags & FLAG_DISALLOW_INTERCEPT) != 0; 1164 if (!disallowIntercept) { 1165 intercepted = onInterceptTouchEvent(ev); 1166 ev.setAction(action); // restore action in case onInterceptTouchEvent() changed it 1167 } else { 1168 intercepted = false; 1169 } 1170 } else { 1171 intercepted = true; 1172 } 1173 1174 // Check for cancelation. 1175 final boolean canceled = resetCancelNextUpFlag(this) 1176 || actionMasked == MotionEvent.ACTION_CANCEL; 1177 1178 // Update list of touch targets for pointer down, if needed. 1179 final boolean split = (mGroupFlags & FLAG_SPLIT_MOTION_EVENTS) != 0; 1180 TouchTarget newTouchTarget = null; 1181 boolean alreadyDispatchedToNewTouchTarget = false; 1182 if (!canceled && !intercepted) { 1183 if (actionMasked == MotionEvent.ACTION_DOWN 1184 || (split && actionMasked == MotionEvent.ACTION_POINTER_DOWN)) { 1185 final int actionIndex = ev.getActionIndex(); // always 0 for down 1186 final int idBitsToAssign = split ? 1 << ev.getPointerId(actionIndex) 1187 : TouchTarget.ALL_POINTER_IDS; 1188 1189 // Clean up earlier touch targets for this pointer id in case they 1190 // have become out of sync. 1191 removePointersFromTouchTargets(idBitsToAssign); 1192 1193 final int childrenCount = mChildrenCount; 1194 if (childrenCount != 0) { 1195 // Find a child that can receive the event. Scan children from front to back. 1196 final View[] children = mChildren; 1197 final float x = ev.getX(actionIndex); 1198 final float y = ev.getY(actionIndex); 1199 1200 for (int i = childrenCount - 1; i >= 0; i--) { 1201 final View child = children[i]; 1202 if ((child.mViewFlags & VISIBILITY_MASK) != VISIBLE 1203 && child.getAnimation() == null) { 1204 // Skip invisible child unless it is animating. 1205 continue; 1206 } 1207 1208 if (!isTransformedTouchPointInView(x, y, child, null)) { 1209 // New pointer is out of child's bounds. 1210 continue; 1211 } 1212 1213 newTouchTarget = getTouchTarget(child); 1214 if (newTouchTarget != null) { 1215 // Child is already receiving touch within its bounds. 1216 // Give it the new pointer in addition to the ones it is handling. 1217 newTouchTarget.pointerIdBits |= idBitsToAssign; 1218 break; 1219 } 1220 1221 resetCancelNextUpFlag(child); 1222 if (dispatchTransformedTouchEvent(ev, false, child, idBitsToAssign)) { 1223 // Child wants to receive touch within its bounds. 1224 mLastTouchDownTime = ev.getDownTime(); 1225 mLastTouchDownIndex = i; 1226 mLastTouchDownX = ev.getX(); 1227 mLastTouchDownY = ev.getY(); 1228 newTouchTarget = addTouchTarget(child, idBitsToAssign); 1229 alreadyDispatchedToNewTouchTarget = true; 1230 break; 1231 } 1232 } 1233 } 1234 1235 if (newTouchTarget == null && mFirstTouchTarget != null) { 1236 // Did not find a child to receive the event. 1237 // Assign the pointer to the least recently added target. 1238 newTouchTarget = mFirstTouchTarget; 1239 while (newTouchTarget.next != null) { 1240 newTouchTarget = newTouchTarget.next; 1241 } 1242 newTouchTarget.pointerIdBits |= idBitsToAssign; 1243 } 1244 } 1245 } 1246 1247 // Dispatch to touch targets. 1248 boolean handled = false; 1249 if (mFirstTouchTarget == null) { 1250 // No touch targets so treat this as an ordinary view. 1251 handled = dispatchTransformedTouchEvent(ev, canceled, null, 1252 TouchTarget.ALL_POINTER_IDS); 1253 } else { 1254 // Dispatch to touch targets, excluding the new touch target if we already 1255 // dispatched to it. Cancel touch targets if necessary. 1256 TouchTarget predecessor = null; 1257 TouchTarget target = mFirstTouchTarget; 1258 while (target != null) { 1259 final TouchTarget next = target.next; 1260 if (alreadyDispatchedToNewTouchTarget && target == newTouchTarget) { 1261 handled = true; 1262 } else { 1263 final boolean cancelChild = resetCancelNextUpFlag(target.child) || intercepted; 1264 if (dispatchTransformedTouchEvent(ev, cancelChild, 1265 target.child, target.pointerIdBits)) { 1266 handled = true; 1267 } 1268 if (cancelChild) { 1269 if (predecessor == null) { 1270 mFirstTouchTarget = next; 1271 } else { 1272 predecessor.next = next; 1273 } 1274 target.recycle(); 1275 target = next; 1276 continue; 1277 } 1278 } 1279 predecessor = target; 1280 target = next; 1281 } 1282 } 1283 1284 // Update list of touch targets for pointer up or cancel, if needed. 1285 if (canceled || actionMasked == MotionEvent.ACTION_UP) { 1286 resetTouchState(); 1287 } else if (split && actionMasked == MotionEvent.ACTION_POINTER_UP) { 1288 final int actionIndex = ev.getActionIndex(); 1289 final int idBitsToRemove = 1 << ev.getPointerId(actionIndex); 1290 removePointersFromTouchTargets(idBitsToRemove); 1291 } 1292 1293 return handled; 1294 } 1295 1296 /** 1297 * Resets all touch state in preparation for a new cycle. 1298 */ 1299 private void resetTouchState() { 1300 clearTouchTargets(); 1301 resetCancelNextUpFlag(this); 1302 mGroupFlags &= ~FLAG_DISALLOW_INTERCEPT; 1303 } 1304 1305 /** 1306 * Resets the cancel next up flag. 1307 * Returns true if the flag was previously set. 1308 */ 1309 private boolean resetCancelNextUpFlag(View view) { 1310 if ((view.mPrivateFlags & CANCEL_NEXT_UP_EVENT) != 0) { 1311 view.mPrivateFlags &= ~CANCEL_NEXT_UP_EVENT; 1312 return true; 1313 } 1314 return false; 1315 } 1316 1317 /** 1318 * Clears all touch targets. 1319 */ 1320 private void clearTouchTargets() { 1321 TouchTarget target = mFirstTouchTarget; 1322 if (target != null) { 1323 do { 1324 TouchTarget next = target.next; 1325 target.recycle(); 1326 target = next; 1327 } while (target != null); 1328 mFirstTouchTarget = null; 1329 } 1330 } 1331 1332 /** 1333 * Cancels and clears all touch targets. 1334 */ 1335 private void cancelAndClearTouchTargets(MotionEvent event) { 1336 if (mFirstTouchTarget != null) { 1337 boolean syntheticEvent = false; 1338 if (event == null) { 1339 final long now = SystemClock.uptimeMillis(); 1340 event = MotionEvent.obtain(now, now, 1341 MotionEvent.ACTION_CANCEL, 0.0f, 0.0f, 0); 1342 syntheticEvent = true; 1343 } 1344 1345 for (TouchTarget target = mFirstTouchTarget; target != null; target = target.next) { 1346 resetCancelNextUpFlag(target.child); 1347 dispatchTransformedTouchEvent(event, true, target.child, target.pointerIdBits); 1348 } 1349 clearTouchTargets(); 1350 1351 if (syntheticEvent) { 1352 event.recycle(); 1353 } 1354 } 1355 } 1356 1357 /** 1358 * Gets the touch target for specified child view. 1359 * Returns null if not found. 1360 */ 1361 private TouchTarget getTouchTarget(View child) { 1362 for (TouchTarget target = mFirstTouchTarget; target != null; target = target.next) { 1363 if (target.child == child) { 1364 return target; 1365 } 1366 } 1367 return null; 1368 } 1369 1370 /** 1371 * Adds a touch target for specified child to the beginning of the list. 1372 * Assumes the target child is not already present. 1373 */ 1374 private TouchTarget addTouchTarget(View child, int pointerIdBits) { 1375 TouchTarget target = TouchTarget.obtain(child, pointerIdBits); 1376 target.next = mFirstTouchTarget; 1377 mFirstTouchTarget = target; 1378 return target; 1379 } 1380 1381 /** 1382 * Removes the pointer ids from consideration. 1383 */ 1384 private void removePointersFromTouchTargets(int pointerIdBits) { 1385 TouchTarget predecessor = null; 1386 TouchTarget target = mFirstTouchTarget; 1387 while (target != null) { 1388 final TouchTarget next = target.next; 1389 if ((target.pointerIdBits & pointerIdBits) != 0) { 1390 target.pointerIdBits &= ~pointerIdBits; 1391 if (target.pointerIdBits == 0) { 1392 if (predecessor == null) { 1393 mFirstTouchTarget = next; 1394 } else { 1395 predecessor.next = next; 1396 } 1397 target.recycle(); 1398 target = next; 1399 continue; 1400 } 1401 } 1402 predecessor = target; 1403 target = next; 1404 } 1405 } 1406 1407 /** 1408 * Returns true if a child view contains the specified point when transformed 1409 * into its coordinate space. 1410 * Child must not be null. 1411 * @hide 1412 */ 1413 protected boolean isTransformedTouchPointInView(float x, float y, View child, 1414 PointF outLocalPoint) { 1415 float localX = x + mScrollX - child.mLeft; 1416 float localY = y + mScrollY - child.mTop; 1417 if (! child.hasIdentityMatrix() && mAttachInfo != null) { 1418 final float[] localXY = mAttachInfo.mTmpTransformLocation; 1419 localXY[0] = localX; 1420 localXY[1] = localY; 1421 child.getInverseMatrix().mapPoints(localXY); 1422 localX = localXY[0]; 1423 localY = localXY[1]; 1424 } 1425 final boolean isInView = child.pointInView(localX, localY); 1426 if (isInView && outLocalPoint != null) { 1427 outLocalPoint.set(localX, localY); 1428 } 1429 return isInView; 1430 } 1431 1432 /** 1433 * Transforms a motion event into the coordinate space of a particular child view, 1434 * filters out irrelevant pointer ids, and overrides its action if necessary. 1435 * If child is null, assumes the MotionEvent will be sent to this ViewGroup instead. 1436 */ 1437 private boolean dispatchTransformedTouchEvent(MotionEvent event, boolean cancel, 1438 View child, int desiredPointerIdBits) { 1439 final boolean handled; 1440 1441 // Canceling motions is a special case. We don't need to perform any transformations 1442 // or filtering. The important part is the action, not the contents. 1443 final int oldAction = event.getAction(); 1444 if (cancel || oldAction == MotionEvent.ACTION_CANCEL) { 1445 event.setAction(MotionEvent.ACTION_CANCEL); 1446 if (child == null) { 1447 handled = super.dispatchTouchEvent(event); 1448 } else { 1449 handled = child.dispatchTouchEvent(event); 1450 } 1451 event.setAction(oldAction); 1452 return handled; 1453 } 1454 1455 // Calculate the number of pointers to deliver. 1456 final int oldPointerCount = event.getPointerCount(); 1457 int newPointerCount = 0; 1458 if (desiredPointerIdBits == TouchTarget.ALL_POINTER_IDS) { 1459 newPointerCount = oldPointerCount; 1460 } else { 1461 for (int i = 0; i < oldPointerCount; i++) { 1462 final int pointerId = event.getPointerId(i); 1463 final int pointerIdBit = 1 << pointerId; 1464 if ((pointerIdBit & desiredPointerIdBits) != 0) { 1465 newPointerCount += 1; 1466 } 1467 } 1468 } 1469 1470 // If for some reason we ended up in an inconsistent state where it looks like we 1471 // might produce a motion event with no pointers in it, then drop the event. 1472 if (newPointerCount == 0) { 1473 return false; 1474 } 1475 1476 // If the number of pointers is the same and we don't need to perform any fancy 1477 // irreversible transformations, then we can reuse the motion event for this 1478 // dispatch as long as we are careful to revert any changes we make. 1479 final boolean reuse = newPointerCount == oldPointerCount 1480 && (child == null || child.hasIdentityMatrix()); 1481 if (reuse) { 1482 if (child == null) { 1483 handled = super.dispatchTouchEvent(event); 1484 } else { 1485 final float offsetX = mScrollX - child.mLeft; 1486 final float offsetY = mScrollY - child.mTop; 1487 event.offsetLocation(offsetX, offsetY); 1488 1489 handled = child.dispatchTouchEvent(event); 1490 1491 event.offsetLocation(-offsetX, -offsetY); 1492 } 1493 return handled; 1494 } 1495 1496 // Make a copy of the event. 1497 // If the number of pointers is different, then we need to filter out irrelevant pointers 1498 // as we make a copy of the motion event. 1499 MotionEvent transformedEvent; 1500 if (newPointerCount == oldPointerCount) { 1501 transformedEvent = MotionEvent.obtain(event); 1502 } else { 1503 growTmpPointerArrays(newPointerCount); 1504 final int[] newPointerIndexMap = mTmpPointerIndexMap; 1505 final int[] newPointerIds = mTmpPointerIds; 1506 final MotionEvent.PointerCoords[] newPointerCoords = mTmpPointerCoords; 1507 1508 int newPointerIndex = 0; 1509 int oldPointerIndex = 0; 1510 while (newPointerIndex < newPointerCount) { 1511 final int pointerId = event.getPointerId(oldPointerIndex); 1512 final int pointerIdBits = 1 << pointerId; 1513 if ((pointerIdBits & desiredPointerIdBits) != 0) { 1514 newPointerIndexMap[newPointerIndex] = oldPointerIndex; 1515 newPointerIds[newPointerIndex] = pointerId; 1516 if (newPointerCoords[newPointerIndex] == null) { 1517 newPointerCoords[newPointerIndex] = new MotionEvent.PointerCoords(); 1518 } 1519 1520 newPointerIndex += 1; 1521 } 1522 oldPointerIndex += 1; 1523 } 1524 1525 final int newAction; 1526 if (cancel) { 1527 newAction = MotionEvent.ACTION_CANCEL; 1528 } else { 1529 final int oldMaskedAction = oldAction & MotionEvent.ACTION_MASK; 1530 if (oldMaskedAction == MotionEvent.ACTION_POINTER_DOWN 1531 || oldMaskedAction == MotionEvent.ACTION_POINTER_UP) { 1532 final int changedPointerId = event.getPointerId( 1533 (oldAction & MotionEvent.ACTION_POINTER_INDEX_MASK) 1534 >> MotionEvent.ACTION_POINTER_INDEX_SHIFT); 1535 final int changedPointerIdBits = 1 << changedPointerId; 1536 if ((changedPointerIdBits & desiredPointerIdBits) != 0) { 1537 if (newPointerCount == 1) { 1538 // The first/last pointer went down/up. 1539 newAction = oldMaskedAction == MotionEvent.ACTION_POINTER_DOWN 1540 ? MotionEvent.ACTION_DOWN : MotionEvent.ACTION_UP; 1541 } else { 1542 // A secondary pointer went down/up. 1543 int newChangedPointerIndex = 0; 1544 while (newPointerIds[newChangedPointerIndex] != changedPointerId) { 1545 newChangedPointerIndex += 1; 1546 } 1547 newAction = oldMaskedAction | (newChangedPointerIndex 1548 << MotionEvent.ACTION_POINTER_INDEX_SHIFT); 1549 } 1550 } else { 1551 // An unrelated pointer changed. 1552 newAction = MotionEvent.ACTION_MOVE; 1553 } 1554 } else { 1555 // Simple up/down/cancel/move motion action. 1556 newAction = oldMaskedAction; 1557 } 1558 } 1559 1560 transformedEvent = null; 1561 final int historySize = event.getHistorySize(); 1562 for (int historyIndex = 0; historyIndex <= historySize; historyIndex++) { 1563 for (newPointerIndex = 0; newPointerIndex < newPointerCount; newPointerIndex++) { 1564 final MotionEvent.PointerCoords c = newPointerCoords[newPointerIndex]; 1565 oldPointerIndex = newPointerIndexMap[newPointerIndex]; 1566 if (historyIndex != historySize) { 1567 event.getHistoricalPointerCoords(oldPointerIndex, historyIndex, c); 1568 } else { 1569 event.getPointerCoords(oldPointerIndex, c); 1570 } 1571 } 1572 1573 final long eventTime; 1574 if (historyIndex != historySize) { 1575 eventTime = event.getHistoricalEventTime(historyIndex); 1576 } else { 1577 eventTime = event.getEventTime(); 1578 } 1579 1580 if (transformedEvent == null) { 1581 transformedEvent = MotionEvent.obtain( 1582 event.getDownTime(), eventTime, newAction, 1583 newPointerCount, newPointerIds, newPointerCoords, 1584 event.getMetaState(), event.getXPrecision(), event.getYPrecision(), 1585 event.getDeviceId(), event.getEdgeFlags(), event.getSource(), 1586 event.getFlags()); 1587 } else { 1588 transformedEvent.addBatch(eventTime, newPointerCoords, 0); 1589 } 1590 } 1591 } 1592 1593 // Perform any necessary transformations and dispatch. 1594 if (child == null) { 1595 handled = super.dispatchTouchEvent(transformedEvent); 1596 } else { 1597 final float offsetX = mScrollX - child.mLeft; 1598 final float offsetY = mScrollY - child.mTop; 1599 transformedEvent.offsetLocation(offsetX, offsetY); 1600 if (! child.hasIdentityMatrix()) { 1601 transformedEvent.transform(child.getInverseMatrix()); 1602 } 1603 1604 handled = child.dispatchTouchEvent(transformedEvent); 1605 } 1606 1607 // Done. 1608 transformedEvent.recycle(); 1609 return handled; 1610 } 1611 1612 /** 1613 * Enlarge the temporary pointer arrays for splitting pointers. 1614 * May discard contents (but keeps PointerCoords objects to avoid reallocating them). 1615 */ 1616 private void growTmpPointerArrays(int desiredCapacity) { 1617 final MotionEvent.PointerCoords[] oldTmpPointerCoords = mTmpPointerCoords; 1618 int capacity; 1619 if (oldTmpPointerCoords != null) { 1620 capacity = oldTmpPointerCoords.length; 1621 if (desiredCapacity <= capacity) { 1622 return; 1623 } 1624 } else { 1625 capacity = 4; 1626 } 1627 1628 while (capacity < desiredCapacity) { 1629 capacity *= 2; 1630 } 1631 1632 mTmpPointerIndexMap = new int[capacity]; 1633 mTmpPointerIds = new int[capacity]; 1634 mTmpPointerCoords = new MotionEvent.PointerCoords[capacity]; 1635 1636 if (oldTmpPointerCoords != null) { 1637 System.arraycopy(oldTmpPointerCoords, 0, mTmpPointerCoords, 0, 1638 oldTmpPointerCoords.length); 1639 } 1640 } 1641 1642 /** 1643 * Enable or disable the splitting of MotionEvents to multiple children during touch event 1644 * dispatch. This behavior is enabled by default for applications that target an 1645 * SDK version of {@link Build.VERSION_CODES#HONEYCOMB} or newer. 1646 * 1647 * <p>When this option is enabled MotionEvents may be split and dispatched to different child 1648 * views depending on where each pointer initially went down. This allows for user interactions 1649 * such as scrolling two panes of content independently, chording of buttons, and performing 1650 * independent gestures on different pieces of content. 1651 * 1652 * @param split <code>true</code> to allow MotionEvents to be split and dispatched to multiple 1653 * child views. <code>false</code> to only allow one child view to be the target of 1654 * any MotionEvent received by this ViewGroup. 1655 */ 1656 public void setMotionEventSplittingEnabled(boolean split) { 1657 // TODO Applications really shouldn't change this setting mid-touch event, 1658 // but perhaps this should handle that case and send ACTION_CANCELs to any child views 1659 // with gestures in progress when this is changed. 1660 if (split) { 1661 mGroupFlags |= FLAG_SPLIT_MOTION_EVENTS; 1662 } else { 1663 mGroupFlags &= ~FLAG_SPLIT_MOTION_EVENTS; 1664 } 1665 } 1666 1667 /** 1668 * Returns true if MotionEvents dispatched to this ViewGroup can be split to multiple children. 1669 * @return true if MotionEvents dispatched to this ViewGroup can be split to multiple children. 1670 */ 1671 public boolean isMotionEventSplittingEnabled() { 1672 return (mGroupFlags & FLAG_SPLIT_MOTION_EVENTS) == FLAG_SPLIT_MOTION_EVENTS; 1673 } 1674 1675 /** 1676 * {@inheritDoc} 1677 */ 1678 public void requestDisallowInterceptTouchEvent(boolean disallowIntercept) { 1679 1680 if (disallowIntercept == ((mGroupFlags & FLAG_DISALLOW_INTERCEPT) != 0)) { 1681 // We're already in this state, assume our ancestors are too 1682 return; 1683 } 1684 1685 if (disallowIntercept) { 1686 mGroupFlags |= FLAG_DISALLOW_INTERCEPT; 1687 } else { 1688 mGroupFlags &= ~FLAG_DISALLOW_INTERCEPT; 1689 } 1690 1691 // Pass it up to our parent 1692 if (mParent != null) { 1693 mParent.requestDisallowInterceptTouchEvent(disallowIntercept); 1694 } 1695 } 1696 1697 /** 1698 * Implement this method to intercept all touch screen motion events. This 1699 * allows you to watch events as they are dispatched to your children, and 1700 * take ownership of the current gesture at any point. 1701 * 1702 * <p>Using this function takes some care, as it has a fairly complicated 1703 * interaction with {@link View#onTouchEvent(MotionEvent) 1704 * View.onTouchEvent(MotionEvent)}, and using it requires implementing 1705 * that method as well as this one in the correct way. Events will be 1706 * received in the following order: 1707 * 1708 * <ol> 1709 * <li> You will receive the down event here. 1710 * <li> The down event will be handled either by a child of this view 1711 * group, or given to your own onTouchEvent() method to handle; this means 1712 * you should implement onTouchEvent() to return true, so you will 1713 * continue to see the rest of the gesture (instead of looking for 1714 * a parent view to handle it). Also, by returning true from 1715 * onTouchEvent(), you will not receive any following 1716 * events in onInterceptTouchEvent() and all touch processing must 1717 * happen in onTouchEvent() like normal. 1718 * <li> For as long as you return false from this function, each following 1719 * event (up to and including the final up) will be delivered first here 1720 * and then to the target's onTouchEvent(). 1721 * <li> If you return true from here, you will not receive any 1722 * following events: the target view will receive the same event but 1723 * with the action {@link MotionEvent#ACTION_CANCEL}, and all further 1724 * events will be delivered to your onTouchEvent() method and no longer 1725 * appear here. 1726 * </ol> 1727 * 1728 * @param ev The motion event being dispatched down the hierarchy. 1729 * @return Return true to steal motion events from the children and have 1730 * them dispatched to this ViewGroup through onTouchEvent(). 1731 * The current target will receive an ACTION_CANCEL event, and no further 1732 * messages will be delivered here. 1733 */ 1734 public boolean onInterceptTouchEvent(MotionEvent ev) { 1735 return false; 1736 } 1737 1738 /** 1739 * {@inheritDoc} 1740 * 1741 * Looks for a view to give focus to respecting the setting specified by 1742 * {@link #getDescendantFocusability()}. 1743 * 1744 * Uses {@link #onRequestFocusInDescendants(int, android.graphics.Rect)} to 1745 * find focus within the children of this group when appropriate. 1746 * 1747 * @see #FOCUS_BEFORE_DESCENDANTS 1748 * @see #FOCUS_AFTER_DESCENDANTS 1749 * @see #FOCUS_BLOCK_DESCENDANTS 1750 * @see #onRequestFocusInDescendants 1751 */ 1752 @Override 1753 public boolean requestFocus(int direction, Rect previouslyFocusedRect) { 1754 if (DBG) { 1755 System.out.println(this + " ViewGroup.requestFocus direction=" 1756 + direction); 1757 } 1758 int descendantFocusability = getDescendantFocusability(); 1759 1760 switch (descendantFocusability) { 1761 case FOCUS_BLOCK_DESCENDANTS: 1762 return super.requestFocus(direction, previouslyFocusedRect); 1763 case FOCUS_BEFORE_DESCENDANTS: { 1764 final boolean took = super.requestFocus(direction, previouslyFocusedRect); 1765 return took ? took : onRequestFocusInDescendants(direction, previouslyFocusedRect); 1766 } 1767 case FOCUS_AFTER_DESCENDANTS: { 1768 final boolean took = onRequestFocusInDescendants(direction, previouslyFocusedRect); 1769 return took ? took : super.requestFocus(direction, previouslyFocusedRect); 1770 } 1771 default: 1772 throw new IllegalStateException("descendant focusability must be " 1773 + "one of FOCUS_BEFORE_DESCENDANTS, FOCUS_AFTER_DESCENDANTS, FOCUS_BLOCK_DESCENDANTS " 1774 + "but is " + descendantFocusability); 1775 } 1776 } 1777 1778 /** 1779 * Look for a descendant to call {@link View#requestFocus} on. 1780 * Called by {@link ViewGroup#requestFocus(int, android.graphics.Rect)} 1781 * when it wants to request focus within its children. Override this to 1782 * customize how your {@link ViewGroup} requests focus within its children. 1783 * @param direction One of FOCUS_UP, FOCUS_DOWN, FOCUS_LEFT, and FOCUS_RIGHT 1784 * @param previouslyFocusedRect The rectangle (in this View's coordinate system) 1785 * to give a finer grained hint about where focus is coming from. May be null 1786 * if there is no hint. 1787 * @return Whether focus was taken. 1788 */ 1789 @SuppressWarnings({"ConstantConditions"}) 1790 protected boolean onRequestFocusInDescendants(int direction, 1791 Rect previouslyFocusedRect) { 1792 int index; 1793 int increment; 1794 int end; 1795 int count = mChildrenCount; 1796 if ((direction & FOCUS_FORWARD) != 0) { 1797 index = 0; 1798 increment = 1; 1799 end = count; 1800 } else { 1801 index = count - 1; 1802 increment = -1; 1803 end = -1; 1804 } 1805 final View[] children = mChildren; 1806 for (int i = index; i != end; i += increment) { 1807 View child = children[i]; 1808 if ((child.mViewFlags & VISIBILITY_MASK) == VISIBLE) { 1809 if (child.requestFocus(direction, previouslyFocusedRect)) { 1810 return true; 1811 } 1812 } 1813 } 1814 return false; 1815 } 1816 1817 /** 1818 * {@inheritDoc} 1819 * 1820 * @hide 1821 */ 1822 @Override 1823 public void dispatchStartTemporaryDetach() { 1824 super.dispatchStartTemporaryDetach(); 1825 final int count = mChildrenCount; 1826 final View[] children = mChildren; 1827 for (int i = 0; i < count; i++) { 1828 children[i].dispatchStartTemporaryDetach(); 1829 } 1830 } 1831 1832 /** 1833 * {@inheritDoc} 1834 * 1835 * @hide 1836 */ 1837 @Override 1838 public void dispatchFinishTemporaryDetach() { 1839 super.dispatchFinishTemporaryDetach(); 1840 final int count = mChildrenCount; 1841 final View[] children = mChildren; 1842 for (int i = 0; i < count; i++) { 1843 children[i].dispatchFinishTemporaryDetach(); 1844 } 1845 } 1846 1847 /** 1848 * {@inheritDoc} 1849 */ 1850 @Override 1851 void dispatchAttachedToWindow(AttachInfo info, int visibility) { 1852 super.dispatchAttachedToWindow(info, visibility); 1853 visibility |= mViewFlags & VISIBILITY_MASK; 1854 final int count = mChildrenCount; 1855 final View[] children = mChildren; 1856 for (int i = 0; i < count; i++) { 1857 children[i].dispatchAttachedToWindow(info, visibility); 1858 } 1859 } 1860 1861 @Override 1862 public boolean dispatchPopulateAccessibilityEvent(AccessibilityEvent event) { 1863 boolean populated = false; 1864 for (int i = 0, count = getChildCount(); i < count; i++) { 1865 populated |= getChildAt(i).dispatchPopulateAccessibilityEvent(event); 1866 } 1867 return populated; 1868 } 1869 1870 /** 1871 * {@inheritDoc} 1872 */ 1873 @Override 1874 void dispatchDetachedFromWindow() { 1875 // If we still have a touch target, we are still in the process of 1876 // dispatching motion events to a child; we need to get rid of that 1877 // child to avoid dispatching events to it after the window is torn 1878 // down. To make sure we keep the child in a consistent state, we 1879 // first send it an ACTION_CANCEL motion event. 1880 cancelAndClearTouchTargets(null); 1881 1882 // In case view is detached while transition is running 1883 mLayoutSuppressed = false; 1884 1885 // Tear down our drag tracking 1886 mDragNotifiedChildren = null; 1887 if (mCurrentDrag != null) { 1888 mCurrentDrag.recycle(); 1889 mCurrentDrag = null; 1890 } 1891 1892 final int count = mChildrenCount; 1893 final View[] children = mChildren; 1894 for (int i = 0; i < count; i++) { 1895 children[i].dispatchDetachedFromWindow(); 1896 } 1897 super.dispatchDetachedFromWindow(); 1898 } 1899 1900 /** 1901 * {@inheritDoc} 1902 */ 1903 @Override 1904 public void setPadding(int left, int top, int right, int bottom) { 1905 super.setPadding(left, top, right, bottom); 1906 1907 if ((mPaddingLeft | mPaddingTop | mPaddingRight | mPaddingRight) != 0) { 1908 mGroupFlags |= FLAG_PADDING_NOT_NULL; 1909 } else { 1910 mGroupFlags &= ~FLAG_PADDING_NOT_NULL; 1911 } 1912 } 1913 1914 /** 1915 * {@inheritDoc} 1916 */ 1917 @Override 1918 protected void dispatchSaveInstanceState(SparseArray<Parcelable> container) { 1919 super.dispatchSaveInstanceState(container); 1920 final int count = mChildrenCount; 1921 final View[] children = mChildren; 1922 for (int i = 0; i < count; i++) { 1923 View c = children[i]; 1924 if ((c.mViewFlags & PARENT_SAVE_DISABLED_MASK) != PARENT_SAVE_DISABLED) { 1925 c.dispatchSaveInstanceState(container); 1926 } 1927 } 1928 } 1929 1930 /** 1931 * Perform dispatching of a {@link #saveHierarchyState freeze()} to only this view, 1932 * not to its children. For use when overriding 1933 * {@link #dispatchSaveInstanceState dispatchFreeze()} to allow subclasses to freeze 1934 * their own state but not the state of their children. 1935 * 1936 * @param container the container 1937 */ 1938 protected void dispatchFreezeSelfOnly(SparseArray<Parcelable> container) { 1939 super.dispatchSaveInstanceState(container); 1940 } 1941 1942 /** 1943 * {@inheritDoc} 1944 */ 1945 @Override 1946 protected void dispatchRestoreInstanceState(SparseArray<Parcelable> container) { 1947 super.dispatchRestoreInstanceState(container); 1948 final int count = mChildrenCount; 1949 final View[] children = mChildren; 1950 for (int i = 0; i < count; i++) { 1951 View c = children[i]; 1952 if ((c.mViewFlags & PARENT_SAVE_DISABLED_MASK) != PARENT_SAVE_DISABLED) { 1953 c.dispatchRestoreInstanceState(container); 1954 } 1955 } 1956 } 1957 1958 /** 1959 * Perform dispatching of a {@link #restoreHierarchyState thaw()} to only this view, 1960 * not to its children. For use when overriding 1961 * {@link #dispatchRestoreInstanceState dispatchThaw()} to allow subclasses to thaw 1962 * their own state but not the state of their children. 1963 * 1964 * @param container the container 1965 */ 1966 protected void dispatchThawSelfOnly(SparseArray<Parcelable> container) { 1967 super.dispatchRestoreInstanceState(container); 1968 } 1969 1970 /** 1971 * Enables or disables the drawing cache for each child of this view group. 1972 * 1973 * @param enabled true to enable the cache, false to dispose of it 1974 */ 1975 protected void setChildrenDrawingCacheEnabled(boolean enabled) { 1976 if (enabled || (mPersistentDrawingCache & PERSISTENT_ALL_CACHES) != PERSISTENT_ALL_CACHES) { 1977 final View[] children = mChildren; 1978 final int count = mChildrenCount; 1979 for (int i = 0; i < count; i++) { 1980 children[i].setDrawingCacheEnabled(enabled); 1981 } 1982 } 1983 } 1984 1985 @Override 1986 protected void onAnimationStart() { 1987 super.onAnimationStart(); 1988 1989 // When this ViewGroup's animation starts, build the cache for the children 1990 if ((mGroupFlags & FLAG_ANIMATION_CACHE) == FLAG_ANIMATION_CACHE) { 1991 final int count = mChildrenCount; 1992 final View[] children = mChildren; 1993 final boolean buildCache = !isHardwareAccelerated(); 1994 1995 for (int i = 0; i < count; i++) { 1996 final View child = children[i]; 1997 if ((child.mViewFlags & VISIBILITY_MASK) == VISIBLE) { 1998 child.setDrawingCacheEnabled(true); 1999 if (buildCache) { 2000 child.buildDrawingCache(true); 2001 } 2002 } 2003 } 2004 2005 mGroupFlags |= FLAG_CHILDREN_DRAWN_WITH_CACHE; 2006 } 2007 } 2008 2009 @Override 2010 protected void onAnimationEnd() { 2011 super.onAnimationEnd(); 2012 2013 // When this ViewGroup's animation ends, destroy the cache of the children 2014 if ((mGroupFlags & FLAG_ANIMATION_CACHE) == FLAG_ANIMATION_CACHE) { 2015 mGroupFlags &= ~FLAG_CHILDREN_DRAWN_WITH_CACHE; 2016 2017 if ((mPersistentDrawingCache & PERSISTENT_ANIMATION_CACHE) == 0) { 2018 setChildrenDrawingCacheEnabled(false); 2019 } 2020 } 2021 } 2022 2023 @Override 2024 Bitmap createSnapshot(Bitmap.Config quality, int backgroundColor, boolean skipChildren) { 2025 int count = mChildrenCount; 2026 int[] visibilities = null; 2027 2028 if (skipChildren) { 2029 visibilities = new int[count]; 2030 for (int i = 0; i < count; i++) { 2031 View child = getChildAt(i); 2032 visibilities[i] = child.getVisibility(); 2033 if (visibilities[i] == View.VISIBLE) { 2034 child.setVisibility(INVISIBLE); 2035 } 2036 } 2037 } 2038 2039 Bitmap b = super.createSnapshot(quality, backgroundColor, skipChildren); 2040 2041 if (skipChildren) { 2042 for (int i = 0; i < count; i++) { 2043 getChildAt(i).setVisibility(visibilities[i]); 2044 } 2045 } 2046 2047 return b; 2048 } 2049 2050 /** 2051 * {@inheritDoc} 2052 */ 2053 @Override 2054 protected void dispatchDraw(Canvas canvas) { 2055 final int count = mChildrenCount; 2056 final View[] children = mChildren; 2057 int flags = mGroupFlags; 2058 2059 if ((flags & FLAG_RUN_ANIMATION) != 0 && canAnimate()) { 2060 final boolean cache = (mGroupFlags & FLAG_ANIMATION_CACHE) == FLAG_ANIMATION_CACHE; 2061 2062 final boolean buildCache = !isHardwareAccelerated(); 2063 for (int i = 0; i < count; i++) { 2064 final View child = children[i]; 2065 if ((child.mViewFlags & VISIBILITY_MASK) == VISIBLE) { 2066 final LayoutParams params = child.getLayoutParams(); 2067 attachLayoutAnimationParameters(child, params, i, count); 2068 bindLayoutAnimation(child); 2069 if (cache) { 2070 child.setDrawingCacheEnabled(true); 2071 if (buildCache) { 2072 child.buildDrawingCache(true); 2073 } 2074 } 2075 } 2076 } 2077 2078 final LayoutAnimationController controller = mLayoutAnimationController; 2079 if (controller.willOverlap()) { 2080 mGroupFlags |= FLAG_OPTIMIZE_INVALIDATE; 2081 } 2082 2083 controller.start(); 2084 2085 mGroupFlags &= ~FLAG_RUN_ANIMATION; 2086 mGroupFlags &= ~FLAG_ANIMATION_DONE; 2087 2088 if (cache) { 2089 mGroupFlags |= FLAG_CHILDREN_DRAWN_WITH_CACHE; 2090 } 2091 2092 if (mAnimationListener != null) { 2093 mAnimationListener.onAnimationStart(controller.getAnimation()); 2094 } 2095 } 2096 2097 int saveCount = 0; 2098 final boolean clipToPadding = (flags & CLIP_TO_PADDING_MASK) == CLIP_TO_PADDING_MASK; 2099 if (clipToPadding) { 2100 saveCount = canvas.save(); 2101 canvas.clipRect(mScrollX + mPaddingLeft, mScrollY + mPaddingTop, 2102 mScrollX + mRight - mLeft - mPaddingRight, 2103 mScrollY + mBottom - mTop - mPaddingBottom); 2104 2105 } 2106 2107 // We will draw our child's animation, let's reset the flag 2108 mPrivateFlags &= ~DRAW_ANIMATION; 2109 mGroupFlags &= ~FLAG_INVALIDATE_REQUIRED; 2110 2111 boolean more = false; 2112 final long drawingTime = getDrawingTime(); 2113 2114 if ((flags & FLAG_USE_CHILD_DRAWING_ORDER) == 0) { 2115 for (int i = 0; i < count; i++) { 2116 final View child = children[i]; 2117 if ((child.mViewFlags & VISIBILITY_MASK) == VISIBLE || child.getAnimation() != null) { 2118 more |= drawChild(canvas, child, drawingTime); 2119 } 2120 } 2121 } else { 2122 for (int i = 0; i < count; i++) { 2123 final View child = children[getChildDrawingOrder(count, i)]; 2124 if ((child.mViewFlags & VISIBILITY_MASK) == VISIBLE || child.getAnimation() != null) { 2125 more |= drawChild(canvas, child, drawingTime); 2126 } 2127 } 2128 } 2129 2130 // Draw any disappearing views that have animations 2131 if (mDisappearingChildren != null) { 2132 final ArrayList<View> disappearingChildren = mDisappearingChildren; 2133 final int disappearingCount = disappearingChildren.size() - 1; 2134 // Go backwards -- we may delete as animations finish 2135 for (int i = disappearingCount; i >= 0; i--) { 2136 final View child = disappearingChildren.get(i); 2137 more |= drawChild(canvas, child, drawingTime); 2138 } 2139 } 2140 2141 if (clipToPadding) { 2142 canvas.restoreToCount(saveCount); 2143 } 2144 2145 // mGroupFlags might have been updated by drawChild() 2146 flags = mGroupFlags; 2147 2148 if ((flags & FLAG_INVALIDATE_REQUIRED) == FLAG_INVALIDATE_REQUIRED) { 2149 invalidate(); 2150 } 2151 2152 if ((flags & FLAG_ANIMATION_DONE) == 0 && (flags & FLAG_NOTIFY_ANIMATION_LISTENER) == 0 && 2153 mLayoutAnimationController.isDone() && !more) { 2154 // We want to erase the drawing cache and notify the listener after the 2155 // next frame is drawn because one extra invalidate() is caused by 2156 // drawChild() after the animation is over 2157 mGroupFlags |= FLAG_NOTIFY_ANIMATION_LISTENER; 2158 final Runnable end = new Runnable() { 2159 public void run() { 2160 notifyAnimationListener(); 2161 } 2162 }; 2163 post(end); 2164 } 2165 } 2166 2167 /** 2168 * Returns the index of the child to draw for this iteration. Override this 2169 * if you want to change the drawing order of children. By default, it 2170 * returns i. 2171 * <p> 2172 * NOTE: In order for this method to be called, you must enable child ordering 2173 * first by calling {@link #setChildrenDrawingOrderEnabled(boolean)}. 2174 * 2175 * @param i The current iteration. 2176 * @return The index of the child to draw this iteration. 2177 * 2178 * @see #setChildrenDrawingOrderEnabled(boolean) 2179 * @see #isChildrenDrawingOrderEnabled() 2180 */ 2181 protected int getChildDrawingOrder(int childCount, int i) { 2182 return i; 2183 } 2184 2185 private void notifyAnimationListener() { 2186 mGroupFlags &= ~FLAG_NOTIFY_ANIMATION_LISTENER; 2187 mGroupFlags |= FLAG_ANIMATION_DONE; 2188 2189 if (mAnimationListener != null) { 2190 final Runnable end = new Runnable() { 2191 public void run() { 2192 mAnimationListener.onAnimationEnd(mLayoutAnimationController.getAnimation()); 2193 } 2194 }; 2195 post(end); 2196 } 2197 2198 if ((mGroupFlags & FLAG_ANIMATION_CACHE) == FLAG_ANIMATION_CACHE) { 2199 mGroupFlags &= ~FLAG_CHILDREN_DRAWN_WITH_CACHE; 2200 if ((mPersistentDrawingCache & PERSISTENT_ANIMATION_CACHE) == 0) { 2201 setChildrenDrawingCacheEnabled(false); 2202 } 2203 } 2204 2205 invalidate(); 2206 } 2207 2208 /** 2209 * This method is used to cause children of this ViewGroup to restore or recreate their 2210 * display lists. It is called by getDisplayList() when the parent ViewGroup does not need 2211 * to recreate its own display list, which would happen if it went through the normal 2212 * draw/dispatchDraw mechanisms. 2213 * 2214 * @hide 2215 */ 2216 @Override 2217 protected void dispatchGetDisplayList() { 2218 final int count = mChildrenCount; 2219 final View[] children = mChildren; 2220 for (int i = 0; i < count; i++) { 2221 final View child = children[i]; 2222 child.mRecreateDisplayList = (child.mPrivateFlags & INVALIDATED) == INVALIDATED; 2223 child.mPrivateFlags &= ~INVALIDATED; 2224 child.getDisplayList(); 2225 child.mRecreateDisplayList = false; 2226 } 2227 } 2228 2229 /** 2230 * Draw one child of this View Group. This method is responsible for getting 2231 * the canvas in the right state. This includes clipping, translating so 2232 * that the child's scrolled origin is at 0, 0, and applying any animation 2233 * transformations. 2234 * 2235 * @param canvas The canvas on which to draw the child 2236 * @param child Who to draw 2237 * @param drawingTime The time at which draw is occuring 2238 * @return True if an invalidate() was issued 2239 */ 2240 protected boolean drawChild(Canvas canvas, View child, long drawingTime) { 2241 boolean more = false; 2242 2243 final int cl = child.mLeft; 2244 final int ct = child.mTop; 2245 final int cr = child.mRight; 2246 final int cb = child.mBottom; 2247 2248 final boolean childHasIdentityMatrix = child.hasIdentityMatrix(); 2249 2250 final int flags = mGroupFlags; 2251 2252 if ((flags & FLAG_CLEAR_TRANSFORMATION) == FLAG_CLEAR_TRANSFORMATION) { 2253 mChildTransformation.clear(); 2254 mGroupFlags &= ~FLAG_CLEAR_TRANSFORMATION; 2255 } 2256 2257 Transformation transformToApply = null; 2258 Transformation invalidationTransform; 2259 final Animation a = child.getAnimation(); 2260 boolean concatMatrix = false; 2261 2262 boolean scalingRequired = false; 2263 boolean caching; 2264 int layerType = child.getLayerType(); 2265 2266 if ((flags & FLAG_CHILDREN_DRAWN_WITH_CACHE) == FLAG_CHILDREN_DRAWN_WITH_CACHE || 2267 (flags & FLAG_ALWAYS_DRAWN_WITH_CACHE) == FLAG_ALWAYS_DRAWN_WITH_CACHE) { 2268 caching = true; 2269 if (mAttachInfo != null) scalingRequired = mAttachInfo.mScalingRequired; 2270 } else { 2271 caching = (layerType != LAYER_TYPE_NONE) || canvas.isHardwareAccelerated(); 2272 } 2273 2274 if (a != null) { 2275 final boolean initialized = a.isInitialized(); 2276 if (!initialized) { 2277 a.initialize(cr - cl, cb - ct, getWidth(), getHeight()); 2278 a.initializeInvalidateRegion(0, 0, cr - cl, cb - ct); 2279 child.onAnimationStart(); 2280 } 2281 2282 more = a.getTransformation(drawingTime, mChildTransformation, 2283 scalingRequired ? mAttachInfo.mApplicationScale : 1f); 2284 if (scalingRequired && mAttachInfo.mApplicationScale != 1f) { 2285 if (mInvalidationTransformation == null) { 2286 mInvalidationTransformation = new Transformation(); 2287 } 2288 invalidationTransform = mInvalidationTransformation; 2289 a.getTransformation(drawingTime, invalidationTransform, 1f); 2290 } else { 2291 invalidationTransform = mChildTransformation; 2292 } 2293 transformToApply = mChildTransformation; 2294 2295 concatMatrix = a.willChangeTransformationMatrix(); 2296 2297 if (more) { 2298 if (!a.willChangeBounds()) { 2299 if ((flags & (FLAG_OPTIMIZE_INVALIDATE | FLAG_ANIMATION_DONE)) == 2300 FLAG_OPTIMIZE_INVALIDATE) { 2301 mGroupFlags |= FLAG_INVALIDATE_REQUIRED; 2302 } else if ((flags & FLAG_INVALIDATE_REQUIRED) == 0) { 2303 // The child need to draw an animation, potentially offscreen, so 2304 // make sure we do not cancel invalidate requests 2305 mPrivateFlags |= DRAW_ANIMATION; 2306 invalidate(cl, ct, cr, cb); 2307 } 2308 } else { 2309 if (mInvalidateRegion == null) { 2310 mInvalidateRegion = new RectF(); 2311 } 2312 final RectF region = mInvalidateRegion; 2313 a.getInvalidateRegion(0, 0, cr - cl, cb - ct, region, invalidationTransform); 2314 2315 // The child need to draw an animation, potentially offscreen, so 2316 // make sure we do not cancel invalidate requests 2317 mPrivateFlags |= DRAW_ANIMATION; 2318 2319 final int left = cl + (int) region.left; 2320 final int top = ct + (int) region.top; 2321 invalidate(left, top, left + (int) region.width(), top + (int) region.height()); 2322 } 2323 } 2324 } else if ((flags & FLAG_SUPPORT_STATIC_TRANSFORMATIONS) == 2325 FLAG_SUPPORT_STATIC_TRANSFORMATIONS) { 2326 final boolean hasTransform = getChildStaticTransformation(child, mChildTransformation); 2327 if (hasTransform) { 2328 final int transformType = mChildTransformation.getTransformationType(); 2329 transformToApply = transformType != Transformation.TYPE_IDENTITY ? 2330 mChildTransformation : null; 2331 concatMatrix = (transformType & Transformation.TYPE_MATRIX) != 0; 2332 } 2333 } 2334 2335 concatMatrix |= !childHasIdentityMatrix; 2336 2337 // Sets the flag as early as possible to allow draw() implementations 2338 // to call invalidate() successfully when doing animations 2339 child.mPrivateFlags |= DRAWN; 2340 2341 if (!concatMatrix && canvas.quickReject(cl, ct, cr, cb, Canvas.EdgeType.BW) && 2342 (child.mPrivateFlags & DRAW_ANIMATION) == 0) { 2343 return more; 2344 } 2345 2346 float alpha = child.getAlpha(); 2347 // Bail out early if the view does not need to be drawn 2348 if (alpha <= ViewConfiguration.ALPHA_THRESHOLD && (child.mPrivateFlags & ALPHA_SET) == 0 && 2349 !(child instanceof SurfaceView)) { 2350 return more; 2351 } 2352 2353 if (canvas.isHardwareAccelerated()) { 2354 // Clear INVALIDATED flag to allow invalidation to occur during rendering, but 2355 // retain the flag's value temporarily in the mRecreateDisplayList flag 2356 child.mRecreateDisplayList = (child.mPrivateFlags & INVALIDATED) == INVALIDATED; 2357 child.mPrivateFlags &= ~INVALIDATED; 2358 } 2359 2360 child.computeScroll(); 2361 2362 final int sx = child.mScrollX; 2363 final int sy = child.mScrollY; 2364 2365 DisplayList displayList = null; 2366 Bitmap cache = null; 2367 if (caching) { 2368 if (!canvas.isHardwareAccelerated()) { 2369 if (layerType != LAYER_TYPE_NONE) { 2370 layerType = LAYER_TYPE_SOFTWARE; 2371 child.buildDrawingCache(true); 2372 } 2373 cache = child.getDrawingCache(true); 2374 } else { 2375 if (layerType == LAYER_TYPE_SOFTWARE) { 2376 child.buildDrawingCache(true); 2377 cache = child.getDrawingCache(true); 2378 } else if (layerType == LAYER_TYPE_NONE) { 2379 displayList = child.getDisplayList(); 2380 } 2381 } 2382 } 2383 2384 final boolean hasDisplayList = displayList != null && displayList.isReady(); 2385 final boolean hasNoCache = cache == null || hasDisplayList; 2386 2387 final int restoreTo = canvas.save(); 2388 if (cache == null && !hasDisplayList) { 2389 canvas.translate(cl - sx, ct - sy); 2390 } else { 2391 canvas.translate(cl, ct); 2392 if (scalingRequired) { 2393 // mAttachInfo cannot be null, otherwise scalingRequired == false 2394 final float scale = 1.0f / mAttachInfo.mApplicationScale; 2395 canvas.scale(scale, scale); 2396 } 2397 } 2398 2399 boolean layerSaved = false; 2400 2401 if (transformToApply != null || alpha < 1.0f || !child.hasIdentityMatrix()) { 2402 if (transformToApply != null || !childHasIdentityMatrix) { 2403 int transX = 0; 2404 int transY = 0; 2405 2406 if (cache == null && !hasDisplayList) { 2407 transX = -sx; 2408 transY = -sy; 2409 } 2410 2411 if (transformToApply != null) { 2412 if (concatMatrix) { 2413 // Undo the scroll translation, apply the transformation matrix, 2414 // then redo the scroll translate to get the correct result. 2415 canvas.translate(-transX, -transY); 2416 canvas.concat(transformToApply.getMatrix()); 2417 canvas.translate(transX, transY); 2418 mGroupFlags |= FLAG_CLEAR_TRANSFORMATION; 2419 } 2420 2421 float transformAlpha = transformToApply.getAlpha(); 2422 if (transformAlpha < 1.0f) { 2423 alpha *= transformToApply.getAlpha(); 2424 mGroupFlags |= FLAG_CLEAR_TRANSFORMATION; 2425 } 2426 } 2427 2428 if (!childHasIdentityMatrix) { 2429 canvas.translate(-transX, -transY); 2430 canvas.concat(child.getMatrix()); 2431 canvas.translate(transX, transY); 2432 } 2433 } 2434 2435 if (alpha < 1.0f) { 2436 mGroupFlags |= FLAG_CLEAR_TRANSFORMATION; 2437 if (hasNoCache) { 2438 final int multipliedAlpha = (int) (255 * alpha); 2439 if (!child.onSetAlpha(multipliedAlpha)) { 2440 int layerFlags = Canvas.HAS_ALPHA_LAYER_SAVE_FLAG; 2441 if ((flags & FLAG_CLIP_CHILDREN) == FLAG_CLIP_CHILDREN || 2442 layerType != LAYER_TYPE_NONE) { 2443 layerFlags |= Canvas.CLIP_TO_LAYER_SAVE_FLAG; 2444 } 2445 if (layerType != LAYER_TYPE_NONE) { 2446 child.mLayerPaint.setAlpha(multipliedAlpha); 2447 } else { 2448 canvas.saveLayerAlpha(sx, sy, sx + cr - cl, sy + cb - ct, 2449 multipliedAlpha, layerFlags); 2450 } 2451 } else { 2452 // Alpha is handled by the child directly, clobber the layer's alpha 2453 if (layerType != LAYER_TYPE_NONE) { 2454 child.mLayerPaint.setAlpha(255); 2455 } 2456 child.mPrivateFlags |= ALPHA_SET; 2457 } 2458 } 2459 } 2460 } else if ((child.mPrivateFlags & ALPHA_SET) == ALPHA_SET) { 2461 child.onSetAlpha(255); 2462 child.mPrivateFlags &= ~ALPHA_SET; 2463 } 2464 2465 if ((flags & FLAG_CLIP_CHILDREN) == FLAG_CLIP_CHILDREN) { 2466 if (cache == null && !hasDisplayList) { 2467 canvas.clipRect(sx, sy, sx + (cr - cl), sy + (cb - ct)); 2468 } else { 2469 if (!scalingRequired || cache == null) { 2470 canvas.clipRect(0, 0, cr - cl, cb - ct); 2471 } else { 2472 canvas.clipRect(0, 0, cache.getWidth(), cache.getHeight()); 2473 } 2474 } 2475 } 2476 2477 if (hasNoCache) { 2478 boolean layerRendered = false; 2479 if (layerType == LAYER_TYPE_HARDWARE) { 2480 final HardwareLayer layer = child.getHardwareLayer(canvas); 2481 if (layer != null && layer.isValid()) { 2482 ((HardwareCanvas) canvas).drawHardwareLayer(layer, 0, 0, child.mLayerPaint); 2483 layerRendered = true; 2484 } else { 2485 canvas.saveLayer(sx, sy, sx + cr - cl, sy + cb - ct, child.mLayerPaint, 2486 Canvas.HAS_ALPHA_LAYER_SAVE_FLAG | Canvas.CLIP_TO_LAYER_SAVE_FLAG); 2487 } 2488 } 2489 2490 if (!layerRendered) { 2491 if (!hasDisplayList) { 2492 // Fast path for layouts with no backgrounds 2493 if ((child.mPrivateFlags & SKIP_DRAW) == SKIP_DRAW) { 2494 if (ViewDebug.TRACE_HIERARCHY) { 2495 ViewDebug.trace(this, ViewDebug.HierarchyTraceType.DRAW); 2496 } 2497 child.mPrivateFlags &= ~DIRTY_MASK; 2498 child.dispatchDraw(canvas); 2499 } else { 2500 child.draw(canvas); 2501 } 2502 } else { 2503 child.mPrivateFlags &= ~DIRTY_MASK; 2504 // Skip drawing the display list into ours if we were just refreshing 2505 // it's content; we already have a reference to it in our display list 2506 if (mRecreateDisplayList || mLayerType != LAYER_TYPE_NONE) { 2507 ((HardwareCanvas) canvas).drawDisplayList(displayList); 2508 } 2509 } 2510 } 2511 } else if (cache != null) { 2512 child.mPrivateFlags &= ~DIRTY_MASK; 2513 Paint cachePaint; 2514 2515 if (layerType == LAYER_TYPE_NONE) { 2516 cachePaint = mCachePaint; 2517 if (alpha < 1.0f) { 2518 cachePaint.setAlpha((int) (alpha * 255)); 2519 mGroupFlags |= FLAG_ALPHA_LOWER_THAN_ONE; 2520 } else if ((flags & FLAG_ALPHA_LOWER_THAN_ONE) == FLAG_ALPHA_LOWER_THAN_ONE) { 2521 cachePaint.setAlpha(255); 2522 mGroupFlags &= ~FLAG_ALPHA_LOWER_THAN_ONE; 2523 } 2524 } else { 2525 cachePaint = child.mLayerPaint; 2526 cachePaint.setAlpha((int) (alpha * 255)); 2527 } 2528 canvas.drawBitmap(cache, 0.0f, 0.0f, cachePaint); 2529 } 2530 2531 canvas.restoreToCount(restoreTo); 2532 2533 if (a != null && !more) { 2534 child.onSetAlpha(255); 2535 finishAnimatingView(child, a); 2536 } 2537 2538 if (more && canvas.isHardwareAccelerated()) { 2539 // invalidation is the trigger to recreate display lists, so if we're using 2540 // display lists to render, force an invalidate to allow the animation to 2541 // continue drawing another frame 2542 invalidate(); 2543 } 2544 2545 child.mRecreateDisplayList = false; 2546 2547 return more; 2548 } 2549 2550 /** 2551 * By default, children are clipped to their bounds before drawing. This 2552 * allows view groups to override this behavior for animations, etc. 2553 * 2554 * @param clipChildren true to clip children to their bounds, 2555 * false otherwise 2556 * @attr ref android.R.styleable#ViewGroup_clipChildren 2557 */ 2558 public void setClipChildren(boolean clipChildren) { 2559 setBooleanFlag(FLAG_CLIP_CHILDREN, clipChildren); 2560 } 2561 2562 /** 2563 * By default, children are clipped to the padding of the ViewGroup. This 2564 * allows view groups to override this behavior 2565 * 2566 * @param clipToPadding true to clip children to the padding of the 2567 * group, false otherwise 2568 * @attr ref android.R.styleable#ViewGroup_clipToPadding 2569 */ 2570 public void setClipToPadding(boolean clipToPadding) { 2571 setBooleanFlag(FLAG_CLIP_TO_PADDING, clipToPadding); 2572 } 2573 2574 /** 2575 * {@inheritDoc} 2576 */ 2577 @Override 2578 public void dispatchSetSelected(boolean selected) { 2579 final View[] children = mChildren; 2580 final int count = mChildrenCount; 2581 for (int i = 0; i < count; i++) { 2582 2583 children[i].setSelected(selected); 2584 } 2585 } 2586 2587 /** 2588 * {@inheritDoc} 2589 */ 2590 @Override 2591 public void dispatchSetActivated(boolean activated) { 2592 final View[] children = mChildren; 2593 final int count = mChildrenCount; 2594 for (int i = 0; i < count; i++) { 2595 2596 children[i].setActivated(activated); 2597 } 2598 } 2599 2600 @Override 2601 protected void dispatchSetPressed(boolean pressed) { 2602 final View[] children = mChildren; 2603 final int count = mChildrenCount; 2604 for (int i = 0; i < count; i++) { 2605 children[i].setPressed(pressed); 2606 } 2607 } 2608 2609 /** 2610 * When this property is set to true, this ViewGroup supports static transformations on 2611 * children; this causes 2612 * {@link #getChildStaticTransformation(View, android.view.animation.Transformation)} to be 2613 * invoked when a child is drawn. 2614 * 2615 * Any subclass overriding 2616 * {@link #getChildStaticTransformation(View, android.view.animation.Transformation)} should 2617 * set this property to true. 2618 * 2619 * @param enabled True to enable static transformations on children, false otherwise. 2620 * 2621 * @see #FLAG_SUPPORT_STATIC_TRANSFORMATIONS 2622 */ 2623 protected void setStaticTransformationsEnabled(boolean enabled) { 2624 setBooleanFlag(FLAG_SUPPORT_STATIC_TRANSFORMATIONS, enabled); 2625 } 2626 2627 /** 2628 * {@inheritDoc} 2629 * 2630 * @see #setStaticTransformationsEnabled(boolean) 2631 */ 2632 protected boolean getChildStaticTransformation(View child, Transformation t) { 2633 return false; 2634 } 2635 2636 /** 2637 * {@hide} 2638 */ 2639 @Override 2640 protected View findViewTraversal(int id) { 2641 if (id == mID) { 2642 return this; 2643 } 2644 2645 final View[] where = mChildren; 2646 final int len = mChildrenCount; 2647 2648 for (int i = 0; i < len; i++) { 2649 View v = where[i]; 2650 2651 if ((v.mPrivateFlags & IS_ROOT_NAMESPACE) == 0) { 2652 v = v.findViewById(id); 2653 2654 if (v != null) { 2655 return v; 2656 } 2657 } 2658 } 2659 2660 return null; 2661 } 2662 2663 /** 2664 * {@hide} 2665 */ 2666 @Override 2667 protected View findViewWithTagTraversal(Object tag) { 2668 if (tag != null && tag.equals(mTag)) { 2669 return this; 2670 } 2671 2672 final View[] where = mChildren; 2673 final int len = mChildrenCount; 2674 2675 for (int i = 0; i < len; i++) { 2676 View v = where[i]; 2677 2678 if ((v.mPrivateFlags & IS_ROOT_NAMESPACE) == 0) { 2679 v = v.findViewWithTag(tag); 2680 2681 if (v != null) { 2682 return v; 2683 } 2684 } 2685 } 2686 2687 return null; 2688 } 2689 2690 /** 2691 * {@hide} 2692 */ 2693 @Override 2694 protected View findViewByPredicateTraversal(Predicate<View> predicate) { 2695 if (predicate.apply(this)) { 2696 return this; 2697 } 2698 2699 final View[] where = mChildren; 2700 final int len = mChildrenCount; 2701 2702 for (int i = 0; i < len; i++) { 2703 View v = where[i]; 2704 2705 if ((v.mPrivateFlags & IS_ROOT_NAMESPACE) == 0) { 2706 v = v.findViewByPredicate(predicate); 2707 2708 if (v != null) { 2709 return v; 2710 } 2711 } 2712 } 2713 2714 return null; 2715 } 2716 2717 /** 2718 * Adds a child view. If no layout parameters are already set on the child, the 2719 * default parameters for this ViewGroup are set on the child. 2720 * 2721 * @param child the child view to add 2722 * 2723 * @see #generateDefaultLayoutParams() 2724 */ 2725 public void addView(View child) { 2726 addView(child, -1); 2727 } 2728 2729 /** 2730 * Adds a child view. If no layout parameters are already set on the child, the 2731 * default parameters for this ViewGroup are set on the child. 2732 * 2733 * @param child the child view to add 2734 * @param index the position at which to add the child 2735 * 2736 * @see #generateDefaultLayoutParams() 2737 */ 2738 public void addView(View child, int index) { 2739 LayoutParams params = child.getLayoutParams(); 2740 if (params == null) { 2741 params = generateDefaultLayoutParams(); 2742 if (params == null) { 2743 throw new IllegalArgumentException("generateDefaultLayoutParams() cannot return null"); 2744 } 2745 } 2746 addView(child, index, params); 2747 } 2748 2749 /** 2750 * Adds a child view with this ViewGroup's default layout parameters and the 2751 * specified width and height. 2752 * 2753 * @param child the child view to add 2754 */ 2755 public void addView(View child, int width, int height) { 2756 final LayoutParams params = generateDefaultLayoutParams(); 2757 params.width = width; 2758 params.height = height; 2759 addView(child, -1, params); 2760 } 2761 2762 /** 2763 * Adds a child view with the specified layout parameters. 2764 * 2765 * @param child the child view to add 2766 * @param params the layout parameters to set on the child 2767 */ 2768 public void addView(View child, LayoutParams params) { 2769 addView(child, -1, params); 2770 } 2771 2772 /** 2773 * Adds a child view with the specified layout parameters. 2774 * 2775 * @param child the child view to add 2776 * @param index the position at which to add the child 2777 * @param params the layout parameters to set on the child 2778 */ 2779 public void addView(View child, int index, LayoutParams params) { 2780 if (DBG) { 2781 System.out.println(this + " addView"); 2782 } 2783 2784 // addViewInner() will call child.requestLayout() when setting the new LayoutParams 2785 // therefore, we call requestLayout() on ourselves before, so that the child's request 2786 // will be blocked at our level 2787 requestLayout(); 2788 invalidate(); 2789 addViewInner(child, index, params, false); 2790 } 2791 2792 /** 2793 * {@inheritDoc} 2794 */ 2795 public void updateViewLayout(View view, ViewGroup.LayoutParams params) { 2796 if (!checkLayoutParams(params)) { 2797 throw new IllegalArgumentException("Invalid LayoutParams supplied to " + this); 2798 } 2799 if (view.mParent != this) { 2800 throw new IllegalArgumentException("Given view not a child of " + this); 2801 } 2802 view.setLayoutParams(params); 2803 } 2804 2805 /** 2806 * {@inheritDoc} 2807 */ 2808 protected boolean checkLayoutParams(ViewGroup.LayoutParams p) { 2809 return p != null; 2810 } 2811 2812 /** 2813 * Interface definition for a callback to be invoked when the hierarchy 2814 * within this view changed. The hierarchy changes whenever a child is added 2815 * to or removed from this view. 2816 */ 2817 public interface OnHierarchyChangeListener { 2818 /** 2819 * Called when a new child is added to a parent view. 2820 * 2821 * @param parent the view in which a child was added 2822 * @param child the new child view added in the hierarchy 2823 */ 2824 void onChildViewAdded(View parent, View child); 2825 2826 /** 2827 * Called when a child is removed from a parent view. 2828 * 2829 * @param parent the view from which the child was removed 2830 * @param child the child removed from the hierarchy 2831 */ 2832 void onChildViewRemoved(View parent, View child); 2833 } 2834 2835 /** 2836 * Register a callback to be invoked when a child is added to or removed 2837 * from this view. 2838 * 2839 * @param listener the callback to invoke on hierarchy change 2840 */ 2841 public void setOnHierarchyChangeListener(OnHierarchyChangeListener listener) { 2842 mOnHierarchyChangeListener = listener; 2843 } 2844 2845 /** 2846 * Adds a view during layout. This is useful if in your onLayout() method, 2847 * you need to add more views (as does the list view for example). 2848 * 2849 * If index is negative, it means put it at the end of the list. 2850 * 2851 * @param child the view to add to the group 2852 * @param index the index at which the child must be added 2853 * @param params the layout parameters to associate with the child 2854 * @return true if the child was added, false otherwise 2855 */ 2856 protected boolean addViewInLayout(View child, int index, LayoutParams params) { 2857 return addViewInLayout(child, index, params, false); 2858 } 2859 2860 /** 2861 * Adds a view during layout. This is useful if in your onLayout() method, 2862 * you need to add more views (as does the list view for example). 2863 * 2864 * If index is negative, it means put it at the end of the list. 2865 * 2866 * @param child the view to add to the group 2867 * @param index the index at which the child must be added 2868 * @param params the layout parameters to associate with the child 2869 * @param preventRequestLayout if true, calling this method will not trigger a 2870 * layout request on child 2871 * @return true if the child was added, false otherwise 2872 */ 2873 protected boolean addViewInLayout(View child, int index, LayoutParams params, 2874 boolean preventRequestLayout) { 2875 child.mParent = null; 2876 addViewInner(child, index, params, preventRequestLayout); 2877 child.mPrivateFlags = (child.mPrivateFlags & ~DIRTY_MASK) | DRAWN; 2878 return true; 2879 } 2880 2881 /** 2882 * Prevents the specified child to be laid out during the next layout pass. 2883 * 2884 * @param child the child on which to perform the cleanup 2885 */ 2886 protected void cleanupLayoutState(View child) { 2887 child.mPrivateFlags &= ~View.FORCE_LAYOUT; 2888 } 2889 2890 private void addViewInner(View child, int index, LayoutParams params, 2891 boolean preventRequestLayout) { 2892 2893 if (child.getParent() != null) { 2894 throw new IllegalStateException("The specified child already has a parent. " + 2895 "You must call removeView() on the child's parent first."); 2896 } 2897 2898 if (mTransition != null) { 2899 mTransition.addChild(this, child); 2900 } 2901 2902 if (!checkLayoutParams(params)) { 2903 params = generateLayoutParams(params); 2904 } 2905 2906 if (preventRequestLayout) { 2907 child.mLayoutParams = params; 2908 } else { 2909 child.setLayoutParams(params); 2910 } 2911 2912 if (index < 0) { 2913 index = mChildrenCount; 2914 } 2915 2916 addInArray(child, index); 2917 2918 // tell our children 2919 if (preventRequestLayout) { 2920 child.assignParent(this); 2921 } else { 2922 child.mParent = this; 2923 } 2924 2925 if (child.hasFocus()) { 2926 requestChildFocus(child, child.findFocus()); 2927 } 2928 2929 AttachInfo ai = mAttachInfo; 2930 if (ai != null) { 2931 boolean lastKeepOn = ai.mKeepScreenOn; 2932 ai.mKeepScreenOn = false; 2933 child.dispatchAttachedToWindow(mAttachInfo, (mViewFlags&VISIBILITY_MASK)); 2934 if (ai.mKeepScreenOn) { 2935 needGlobalAttributesUpdate(true); 2936 } 2937 ai.mKeepScreenOn = lastKeepOn; 2938 } 2939 2940 if (mOnHierarchyChangeListener != null) { 2941 mOnHierarchyChangeListener.onChildViewAdded(this, child); 2942 } 2943 2944 if ((child.mViewFlags & DUPLICATE_PARENT_STATE) == DUPLICATE_PARENT_STATE) { 2945 mGroupFlags |= FLAG_NOTIFY_CHILDREN_ON_DRAWABLE_STATE_CHANGE; 2946 } 2947 } 2948 2949 private void addInArray(View child, int index) { 2950 View[] children = mChildren; 2951 final int count = mChildrenCount; 2952 final int size = children.length; 2953 if (index == count) { 2954 if (size == count) { 2955 mChildren = new View[size + ARRAY_CAPACITY_INCREMENT]; 2956 System.arraycopy(children, 0, mChildren, 0, size); 2957 children = mChildren; 2958 } 2959 children[mChildrenCount++] = child; 2960 } else if (index < count) { 2961 if (size == count) { 2962 mChildren = new View[size + ARRAY_CAPACITY_INCREMENT]; 2963 System.arraycopy(children, 0, mChildren, 0, index); 2964 System.arraycopy(children, index, mChildren, index + 1, count - index); 2965 children = mChildren; 2966 } else { 2967 System.arraycopy(children, index, children, index + 1, count - index); 2968 } 2969 children[index] = child; 2970 mChildrenCount++; 2971 if (mLastTouchDownIndex >= index) { 2972 mLastTouchDownIndex++; 2973 } 2974 } else { 2975 throw new IndexOutOfBoundsException("index=" + index + " count=" + count); 2976 } 2977 } 2978 2979 // This method also sets the child's mParent to null 2980 private void removeFromArray(int index) { 2981 final View[] children = mChildren; 2982 if (!(mTransitioningViews != null && mTransitioningViews.contains(children[index]))) { 2983 children[index].mParent = null; 2984 } 2985 final int count = mChildrenCount; 2986 if (index == count - 1) { 2987 children[--mChildrenCount] = null; 2988 } else if (index >= 0 && index < count) { 2989 System.arraycopy(children, index + 1, children, index, count - index - 1); 2990 children[--mChildrenCount] = null; 2991 } else { 2992 throw new IndexOutOfBoundsException(); 2993 } 2994 if (mLastTouchDownIndex == index) { 2995 mLastTouchDownTime = 0; 2996 mLastTouchDownIndex = -1; 2997 } else if (mLastTouchDownIndex > index) { 2998 mLastTouchDownIndex--; 2999 } 3000 } 3001 3002 // This method also sets the children's mParent to null 3003 private void removeFromArray(int start, int count) { 3004 final View[] children = mChildren; 3005 final int childrenCount = mChildrenCount; 3006 3007 start = Math.max(0, start); 3008 final int end = Math.min(childrenCount, start + count); 3009 3010 if (start == end) { 3011 return; 3012 } 3013 3014 if (end == childrenCount) { 3015 for (int i = start; i < end; i++) { 3016 children[i].mParent = null; 3017 children[i] = null; 3018 } 3019 } else { 3020 for (int i = start; i < end; i++) { 3021 children[i].mParent = null; 3022 } 3023 3024 // Since we're looping above, we might as well do the copy, but is arraycopy() 3025 // faster than the extra 2 bounds checks we would do in the loop? 3026 System.arraycopy(children, end, children, start, childrenCount - end); 3027 3028 for (int i = childrenCount - (end - start); i < childrenCount; i++) { 3029 children[i] = null; 3030 } 3031 } 3032 3033 mChildrenCount -= (end - start); 3034 } 3035 3036 private void bindLayoutAnimation(View child) { 3037 Animation a = mLayoutAnimationController.getAnimationForView(child); 3038 child.setAnimation(a); 3039 } 3040 3041 /** 3042 * Subclasses should override this method to set layout animation 3043 * parameters on the supplied child. 3044 * 3045 * @param child the child to associate with animation parameters 3046 * @param params the child's layout parameters which hold the animation 3047 * parameters 3048 * @param index the index of the child in the view group 3049 * @param count the number of children in the view group 3050 */ 3051 protected void attachLayoutAnimationParameters(View child, 3052 LayoutParams params, int index, int count) { 3053 LayoutAnimationController.AnimationParameters animationParams = 3054 params.layoutAnimationParameters; 3055 if (animationParams == null) { 3056 animationParams = new LayoutAnimationController.AnimationParameters(); 3057 params.layoutAnimationParameters = animationParams; 3058 } 3059 3060 animationParams.count = count; 3061 animationParams.index = index; 3062 } 3063 3064 /** 3065 * {@inheritDoc} 3066 */ 3067 public void removeView(View view) { 3068 removeViewInternal(view); 3069 requestLayout(); 3070 invalidate(); 3071 } 3072 3073 /** 3074 * Removes a view during layout. This is useful if in your onLayout() method, 3075 * you need to remove more views. 3076 * 3077 * @param view the view to remove from the group 3078 */ 3079 public void removeViewInLayout(View view) { 3080 removeViewInternal(view); 3081 } 3082 3083 /** 3084 * Removes a range of views during layout. This is useful if in your onLayout() method, 3085 * you need to remove more views. 3086 * 3087 * @param start the index of the first view to remove from the group 3088 * @param count the number of views to remove from the group 3089 */ 3090 public void removeViewsInLayout(int start, int count) { 3091 removeViewsInternal(start, count); 3092 } 3093 3094 /** 3095 * Removes the view at the specified position in the group. 3096 * 3097 * @param index the position in the group of the view to remove 3098 */ 3099 public void removeViewAt(int index) { 3100 removeViewInternal(index, getChildAt(index)); 3101 requestLayout(); 3102 invalidate(); 3103 } 3104 3105 /** 3106 * Removes the specified range of views from the group. 3107 * 3108 * @param start the first position in the group of the range of views to remove 3109 * @param count the number of views to remove 3110 */ 3111 public void removeViews(int start, int count) { 3112 removeViewsInternal(start, count); 3113 requestLayout(); 3114 invalidate(); 3115 } 3116 3117 private void removeViewInternal(View view) { 3118 final int index = indexOfChild(view); 3119 if (index >= 0) { 3120 removeViewInternal(index, view); 3121 } 3122 } 3123 3124 private void removeViewInternal(int index, View view) { 3125 3126 if (mTransition != null) { 3127 mTransition.removeChild(this, view); 3128 } 3129 3130 boolean clearChildFocus = false; 3131 if (view == mFocused) { 3132 view.clearFocusForRemoval(); 3133 clearChildFocus = true; 3134 } 3135 3136 if (view.getAnimation() != null || 3137 (mTransitioningViews != null && mTransitioningViews.contains(view))) { 3138 addDisappearingView(view); 3139 } else if (view.mAttachInfo != null) { 3140 view.dispatchDetachedFromWindow(); 3141 } 3142 3143 if (mOnHierarchyChangeListener != null) { 3144 mOnHierarchyChangeListener.onChildViewRemoved(this, view); 3145 } 3146 3147 needGlobalAttributesUpdate(false); 3148 3149 removeFromArray(index); 3150 3151 if (clearChildFocus) { 3152 clearChildFocus(view); 3153 } 3154 } 3155 3156 /** 3157 * Sets the LayoutTransition object for this ViewGroup. If the LayoutTransition object is 3158 * not null, changes in layout which occur because of children being added to or removed from 3159 * the ViewGroup will be animated according to the animations defined in that LayoutTransition 3160 * object. By default, the transition object is null (so layout changes are not animated). 3161 * 3162 * @param transition The LayoutTransition object that will animated changes in layout. A value 3163 * of <code>null</code> means no transition will run on layout changes. 3164 * @attr ref android.R.styleable#ViewGroup_animateLayoutChanges 3165 */ 3166 public void setLayoutTransition(LayoutTransition transition) { 3167 if (mTransition != null) { 3168 mTransition.removeTransitionListener(mLayoutTransitionListener); 3169 } 3170 mTransition = transition; 3171 if (mTransition != null) { 3172 mTransition.addTransitionListener(mLayoutTransitionListener); 3173 } 3174 } 3175 3176 /** 3177 * Gets the LayoutTransition object for this ViewGroup. If the LayoutTransition object is 3178 * not null, changes in layout which occur because of children being added to or removed from 3179 * the ViewGroup will be animated according to the animations defined in that LayoutTransition 3180 * object. By default, the transition object is null (so layout changes are not animated). 3181 * 3182 * @return LayoutTranstion The LayoutTransition object that will animated changes in layout. 3183 * A value of <code>null</code> means no transition will run on layout changes. 3184 */ 3185 public LayoutTransition getLayoutTransition() { 3186 return mTransition; 3187 } 3188 3189 private void removeViewsInternal(int start, int count) { 3190 final OnHierarchyChangeListener onHierarchyChangeListener = mOnHierarchyChangeListener; 3191 final boolean notifyListener = onHierarchyChangeListener != null; 3192 final View focused = mFocused; 3193 final boolean detach = mAttachInfo != null; 3194 View clearChildFocus = null; 3195 3196 final View[] children = mChildren; 3197 final int end = start + count; 3198 3199 for (int i = start; i < end; i++) { 3200 final View view = children[i]; 3201 3202 if (mTransition != null) { 3203 mTransition.removeChild(this, view); 3204 } 3205 3206 if (view == focused) { 3207 view.clearFocusForRemoval(); 3208 clearChildFocus = view; 3209 } 3210 3211 if (view.getAnimation() != null || 3212 (mTransitioningViews != null && mTransitioningViews.contains(view))) { 3213 addDisappearingView(view); 3214 } else if (detach) { 3215 view.dispatchDetachedFromWindow(); 3216 } 3217 3218 needGlobalAttributesUpdate(false); 3219 3220 if (notifyListener) { 3221 onHierarchyChangeListener.onChildViewRemoved(this, view); 3222 } 3223 } 3224 3225 removeFromArray(start, count); 3226 3227 if (clearChildFocus != null) { 3228 clearChildFocus(clearChildFocus); 3229 } 3230 } 3231 3232 /** 3233 * Call this method to remove all child views from the 3234 * ViewGroup. 3235 */ 3236 public void removeAllViews() { 3237 removeAllViewsInLayout(); 3238 requestLayout(); 3239 invalidate(); 3240 } 3241 3242 /** 3243 * Called by a ViewGroup subclass to remove child views from itself, 3244 * when it must first know its size on screen before it can calculate how many 3245 * child views it will render. An example is a Gallery or a ListView, which 3246 * may "have" 50 children, but actually only render the number of children 3247 * that can currently fit inside the object on screen. Do not call 3248 * this method unless you are extending ViewGroup and understand the 3249 * view measuring and layout pipeline. 3250 */ 3251 public void removeAllViewsInLayout() { 3252 final int count = mChildrenCount; 3253 if (count <= 0) { 3254 return; 3255 } 3256 3257 final View[] children = mChildren; 3258 mChildrenCount = 0; 3259 3260 final OnHierarchyChangeListener listener = mOnHierarchyChangeListener; 3261 final boolean notify = listener != null; 3262 final View focused = mFocused; 3263 final boolean detach = mAttachInfo != null; 3264 View clearChildFocus = null; 3265 3266 needGlobalAttributesUpdate(false); 3267 3268 for (int i = count - 1; i >= 0; i--) { 3269 final View view = children[i]; 3270 3271 if (mTransition != null) { 3272 mTransition.removeChild(this, view); 3273 } 3274 3275 if (view == focused) { 3276 view.clearFocusForRemoval(); 3277 clearChildFocus = view; 3278 } 3279 3280 if (view.getAnimation() != null || 3281 (mTransitioningViews != null && mTransitioningViews.contains(view))) { 3282 addDisappearingView(view); 3283 } else if (detach) { 3284 view.dispatchDetachedFromWindow(); 3285 } 3286 3287 if (notify) { 3288 listener.onChildViewRemoved(this, view); 3289 } 3290 3291 view.mParent = null; 3292 children[i] = null; 3293 } 3294 3295 if (clearChildFocus != null) { 3296 clearChildFocus(clearChildFocus); 3297 } 3298 } 3299 3300 /** 3301 * Finishes the removal of a detached view. This method will dispatch the detached from 3302 * window event and notify the hierarchy change listener. 3303 * 3304 * @param child the child to be definitely removed from the view hierarchy 3305 * @param animate if true and the view has an animation, the view is placed in the 3306 * disappearing views list, otherwise, it is detached from the window 3307 * 3308 * @see #attachViewToParent(View, int, android.view.ViewGroup.LayoutParams) 3309 * @see #detachAllViewsFromParent() 3310 * @see #detachViewFromParent(View) 3311 * @see #detachViewFromParent(int) 3312 */ 3313 protected void removeDetachedView(View child, boolean animate) { 3314 if (mTransition != null) { 3315 mTransition.removeChild(this, child); 3316 } 3317 3318 if (child == mFocused) { 3319 child.clearFocus(); 3320 } 3321 3322 if ((animate && child.getAnimation() != null) || 3323 (mTransitioningViews != null && mTransitioningViews.contains(child))) { 3324 addDisappearingView(child); 3325 } else if (child.mAttachInfo != null) { 3326 child.dispatchDetachedFromWindow(); 3327 } 3328 3329 if (mOnHierarchyChangeListener != null) { 3330 mOnHierarchyChangeListener.onChildViewRemoved(this, child); 3331 } 3332 } 3333 3334 /** 3335 * Attaches a view to this view group. Attaching a view assigns this group as the parent, 3336 * sets the layout parameters and puts the view in the list of children so it can be retrieved 3337 * by calling {@link #getChildAt(int)}. 3338 * 3339 * This method should be called only for view which were detached from their parent. 3340 * 3341 * @param child the child to attach 3342 * @param index the index at which the child should be attached 3343 * @param params the layout parameters of the child 3344 * 3345 * @see #removeDetachedView(View, boolean) 3346 * @see #detachAllViewsFromParent() 3347 * @see #detachViewFromParent(View) 3348 * @see #detachViewFromParent(int) 3349 */ 3350 protected void attachViewToParent(View child, int index, LayoutParams params) { 3351 child.mLayoutParams = params; 3352 3353 if (index < 0) { 3354 index = mChildrenCount; 3355 } 3356 3357 addInArray(child, index); 3358 3359 child.mParent = this; 3360 child.mPrivateFlags = (child.mPrivateFlags & ~DIRTY_MASK & ~DRAWING_CACHE_VALID) | 3361 DRAWN | INVALIDATED; 3362 this.mPrivateFlags |= INVALIDATED; 3363 3364 if (child.hasFocus()) { 3365 requestChildFocus(child, child.findFocus()); 3366 } 3367 } 3368 3369 /** 3370 * Detaches a view from its parent. Detaching a view should be temporary and followed 3371 * either by a call to {@link #attachViewToParent(View, int, android.view.ViewGroup.LayoutParams)} 3372 * or a call to {@link #removeDetachedView(View, boolean)}. When a view is detached, 3373 * its parent is null and cannot be retrieved by a call to {@link #getChildAt(int)}. 3374 * 3375 * @param child the child to detach 3376 * 3377 * @see #detachViewFromParent(int) 3378 * @see #detachViewsFromParent(int, int) 3379 * @see #detachAllViewsFromParent() 3380 * @see #attachViewToParent(View, int, android.view.ViewGroup.LayoutParams) 3381 * @see #removeDetachedView(View, boolean) 3382 */ 3383 protected void detachViewFromParent(View child) { 3384 removeFromArray(indexOfChild(child)); 3385 } 3386 3387 /** 3388 * Detaches a view from its parent. Detaching a view should be temporary and followed 3389 * either by a call to {@link #attachViewToParent(View, int, android.view.ViewGroup.LayoutParams)} 3390 * or a call to {@link #removeDetachedView(View, boolean)}. When a view is detached, 3391 * its parent is null and cannot be retrieved by a call to {@link #getChildAt(int)}. 3392 * 3393 * @param index the index of the child to detach 3394 * 3395 * @see #detachViewFromParent(View) 3396 * @see #detachAllViewsFromParent() 3397 * @see #detachViewsFromParent(int, int) 3398 * @see #attachViewToParent(View, int, android.view.ViewGroup.LayoutParams) 3399 * @see #removeDetachedView(View, boolean) 3400 */ 3401 protected void detachViewFromParent(int index) { 3402 removeFromArray(index); 3403 } 3404 3405 /** 3406 * Detaches a range of view from their parent. Detaching a view should be temporary and followed 3407 * either by a call to {@link #attachViewToParent(View, int, android.view.ViewGroup.LayoutParams)} 3408 * or a call to {@link #removeDetachedView(View, boolean)}. When a view is detached, its 3409 * parent is null and cannot be retrieved by a call to {@link #getChildAt(int)}. 3410 * 3411 * @param start the first index of the childrend range to detach 3412 * @param count the number of children to detach 3413 * 3414 * @see #detachViewFromParent(View) 3415 * @see #detachViewFromParent(int) 3416 * @see #detachAllViewsFromParent() 3417 * @see #attachViewToParent(View, int, android.view.ViewGroup.LayoutParams) 3418 * @see #removeDetachedView(View, boolean) 3419 */ 3420 protected void detachViewsFromParent(int start, int count) { 3421 removeFromArray(start, count); 3422 } 3423 3424 /** 3425 * Detaches all views from the parent. Detaching a view should be temporary and followed 3426 * either by a call to {@link #attachViewToParent(View, int, android.view.ViewGroup.LayoutParams)} 3427 * or a call to {@link #removeDetachedView(View, boolean)}. When a view is detached, 3428 * its parent is null and cannot be retrieved by a call to {@link #getChildAt(int)}. 3429 * 3430 * @see #detachViewFromParent(View) 3431 * @see #detachViewFromParent(int) 3432 * @see #detachViewsFromParent(int, int) 3433 * @see #attachViewToParent(View, int, android.view.ViewGroup.LayoutParams) 3434 * @see #removeDetachedView(View, boolean) 3435 */ 3436 protected void detachAllViewsFromParent() { 3437 final int count = mChildrenCount; 3438 if (count <= 0) { 3439 return; 3440 } 3441 3442 final View[] children = mChildren; 3443 mChildrenCount = 0; 3444 3445 for (int i = count - 1; i >= 0; i--) { 3446 children[i].mParent = null; 3447 children[i] = null; 3448 } 3449 } 3450 3451 /** 3452 * Don't call or override this method. It is used for the implementation of 3453 * the view hierarchy. 3454 */ 3455 public final void invalidateChild(View child, final Rect dirty) { 3456 if (ViewDebug.TRACE_HIERARCHY) { 3457 ViewDebug.trace(this, ViewDebug.HierarchyTraceType.INVALIDATE_CHILD); 3458 } 3459 3460 ViewParent parent = this; 3461 3462 final AttachInfo attachInfo = mAttachInfo; 3463 if (attachInfo != null) { 3464 // If the child is drawing an animation, we want to copy this flag onto 3465 // ourselves and the parent to make sure the invalidate request goes 3466 // through 3467 final boolean drawAnimation = (child.mPrivateFlags & DRAW_ANIMATION) == DRAW_ANIMATION; 3468 3469 if (dirty == null) { 3470 if (child.mLayerType != LAYER_TYPE_NONE) { 3471 mPrivateFlags |= INVALIDATED; 3472 mPrivateFlags &= ~DRAWING_CACHE_VALID; 3473 } 3474 do { 3475 View view = null; 3476 if (parent instanceof View) { 3477 view = (View) parent; 3478 if (view.mLayerType != LAYER_TYPE_NONE && 3479 view.getParent() instanceof View) { 3480 final View grandParent = (View) view.getParent(); 3481 grandParent.mPrivateFlags |= INVALIDATED; 3482 grandParent.mPrivateFlags &= ~DRAWING_CACHE_VALID; 3483 } 3484 if ((view.mPrivateFlags & DIRTY_MASK) != 0) { 3485 // already marked dirty - we're done 3486 break; 3487 } 3488 } 3489 3490 if (drawAnimation) { 3491 if (view != null) { 3492 view.mPrivateFlags |= DRAW_ANIMATION; 3493 } else if (parent instanceof ViewRoot) { 3494 ((ViewRoot) parent).mIsAnimating = true; 3495 } 3496 } 3497 3498 if (parent instanceof ViewRoot) { 3499 ((ViewRoot) parent).invalidate(); 3500 parent = null; 3501 } else if (view != null) { 3502 if ((mPrivateFlags & DRAWN) == DRAWN) { 3503 view.mPrivateFlags &= ~DRAWING_CACHE_VALID; 3504 view.mPrivateFlags |= DIRTY; 3505 parent = view.mParent; 3506 } else { 3507 parent = null; 3508 } 3509 } 3510 } while (parent != null); 3511 } else { 3512 // Check whether the child that requests the invalidate is fully opaque 3513 final boolean isOpaque = child.isOpaque() && !drawAnimation && 3514 child.getAnimation() == null; 3515 // Mark the child as dirty, using the appropriate flag 3516 // Make sure we do not set both flags at the same time 3517 int opaqueFlag = isOpaque ? DIRTY_OPAQUE : DIRTY; 3518 3519 final int[] location = attachInfo.mInvalidateChildLocation; 3520 location[CHILD_LEFT_INDEX] = child.mLeft; 3521 location[CHILD_TOP_INDEX] = child.mTop; 3522 Matrix childMatrix = child.getMatrix(); 3523 if (!childMatrix.isIdentity()) { 3524 RectF boundingRect = attachInfo.mTmpTransformRect; 3525 boundingRect.set(dirty); 3526 childMatrix.mapRect(boundingRect); 3527 dirty.set((int) boundingRect.left, (int) boundingRect.top, 3528 (int) (boundingRect.right + 0.5f), 3529 (int) (boundingRect.bottom + 0.5f)); 3530 } 3531 3532 if (child.mLayerType != LAYER_TYPE_NONE) { 3533 mPrivateFlags |= INVALIDATED; 3534 mPrivateFlags &= ~DRAWING_CACHE_VALID; 3535 } 3536 do { 3537 View view = null; 3538 if (parent instanceof View) { 3539 view = (View) parent; 3540 if (view.mLayerType != LAYER_TYPE_NONE && 3541 view.getParent() instanceof View) { 3542 final View grandParent = (View) view.getParent(); 3543 grandParent.mPrivateFlags |= INVALIDATED; 3544 grandParent.mPrivateFlags &= ~DRAWING_CACHE_VALID; 3545 } 3546 } 3547 3548 if (drawAnimation) { 3549 if (view != null) { 3550 view.mPrivateFlags |= DRAW_ANIMATION; 3551 } else if (parent instanceof ViewRoot) { 3552 ((ViewRoot) parent).mIsAnimating = true; 3553 } 3554 } 3555 3556 // If the parent is dirty opaque or not dirty, mark it dirty with the opaque 3557 // flag coming from the child that initiated the invalidate 3558 if (view != null) { 3559 if ((view.mViewFlags & FADING_EDGE_MASK) != 0 && 3560 view.getSolidColor() == 0 && !view.isOpaque()) { 3561 opaqueFlag = DIRTY; 3562 } 3563 if ((view.mPrivateFlags & DIRTY_MASK) != DIRTY) { 3564 view.mPrivateFlags = (view.mPrivateFlags & ~DIRTY_MASK) | opaqueFlag; 3565 } 3566 } 3567 3568 parent = parent.invalidateChildInParent(location, dirty); 3569 if (view != null) { 3570 // Account for transform on current parent 3571 Matrix m = view.getMatrix(); 3572 if (!m.isIdentity()) { 3573 RectF boundingRect = attachInfo.mTmpTransformRect; 3574 boundingRect.set(dirty); 3575 m.mapRect(boundingRect); 3576 dirty.set((int) boundingRect.left, (int) boundingRect.top, 3577 (int) (boundingRect.right + 0.5f), 3578 (int) (boundingRect.bottom + 0.5f)); 3579 } 3580 } 3581 } while (parent != null); 3582 } 3583 } 3584 } 3585 3586 /** 3587 * Don't call or override this method. It is used for the implementation of 3588 * the view hierarchy. 3589 * 3590 * This implementation returns null if this ViewGroup does not have a parent, 3591 * if this ViewGroup is already fully invalidated or if the dirty rectangle 3592 * does not intersect with this ViewGroup's bounds. 3593 */ 3594 public ViewParent invalidateChildInParent(final int[] location, final Rect dirty) { 3595 if (ViewDebug.TRACE_HIERARCHY) { 3596 ViewDebug.trace(this, ViewDebug.HierarchyTraceType.INVALIDATE_CHILD_IN_PARENT); 3597 } 3598 3599 if ((mPrivateFlags & DRAWN) == DRAWN) { 3600 if ((mGroupFlags & (FLAG_OPTIMIZE_INVALIDATE | FLAG_ANIMATION_DONE)) != 3601 FLAG_OPTIMIZE_INVALIDATE) { 3602 dirty.offset(location[CHILD_LEFT_INDEX] - mScrollX, 3603 location[CHILD_TOP_INDEX] - mScrollY); 3604 3605 final int left = mLeft; 3606 final int top = mTop; 3607 3608 if (dirty.intersect(0, 0, mRight - left, mBottom - top) || 3609 (mPrivateFlags & DRAW_ANIMATION) == DRAW_ANIMATION) { 3610 mPrivateFlags &= ~DRAWING_CACHE_VALID; 3611 3612 location[CHILD_LEFT_INDEX] = left; 3613 location[CHILD_TOP_INDEX] = top; 3614 3615 return mParent; 3616 } 3617 } else { 3618 mPrivateFlags &= ~DRAWN & ~DRAWING_CACHE_VALID; 3619 3620 location[CHILD_LEFT_INDEX] = mLeft; 3621 location[CHILD_TOP_INDEX] = mTop; 3622 3623 dirty.set(0, 0, mRight - location[CHILD_LEFT_INDEX], 3624 mBottom - location[CHILD_TOP_INDEX]); 3625 3626 return mParent; 3627 } 3628 } 3629 3630 return null; 3631 } 3632 3633 /** 3634 * Offset a rectangle that is in a descendant's coordinate 3635 * space into our coordinate space. 3636 * @param descendant A descendant of this view 3637 * @param rect A rectangle defined in descendant's coordinate space. 3638 */ 3639 public final void offsetDescendantRectToMyCoords(View descendant, Rect rect) { 3640 offsetRectBetweenParentAndChild(descendant, rect, true, false); 3641 } 3642 3643 /** 3644 * Offset a rectangle that is in our coordinate space into an ancestor's 3645 * coordinate space. 3646 * @param descendant A descendant of this view 3647 * @param rect A rectangle defined in descendant's coordinate space. 3648 */ 3649 public final void offsetRectIntoDescendantCoords(View descendant, Rect rect) { 3650 offsetRectBetweenParentAndChild(descendant, rect, false, false); 3651 } 3652 3653 /** 3654 * Helper method that offsets a rect either from parent to descendant or 3655 * descendant to parent. 3656 */ 3657 void offsetRectBetweenParentAndChild(View descendant, Rect rect, 3658 boolean offsetFromChildToParent, boolean clipToBounds) { 3659 3660 // already in the same coord system :) 3661 if (descendant == this) { 3662 return; 3663 } 3664 3665 ViewParent theParent = descendant.mParent; 3666 3667 // search and offset up to the parent 3668 while ((theParent != null) 3669 && (theParent instanceof View) 3670 && (theParent != this)) { 3671 3672 if (offsetFromChildToParent) { 3673 rect.offset(descendant.mLeft - descendant.mScrollX, 3674 descendant.mTop - descendant.mScrollY); 3675 if (clipToBounds) { 3676 View p = (View) theParent; 3677 rect.intersect(0, 0, p.mRight - p.mLeft, p.mBottom - p.mTop); 3678 } 3679 } else { 3680 if (clipToBounds) { 3681 View p = (View) theParent; 3682 rect.intersect(0, 0, p.mRight - p.mLeft, p.mBottom - p.mTop); 3683 } 3684 rect.offset(descendant.mScrollX - descendant.mLeft, 3685 descendant.mScrollY - descendant.mTop); 3686 } 3687 3688 descendant = (View) theParent; 3689 theParent = descendant.mParent; 3690 } 3691 3692 // now that we are up to this view, need to offset one more time 3693 // to get into our coordinate space 3694 if (theParent == this) { 3695 if (offsetFromChildToParent) { 3696 rect.offset(descendant.mLeft - descendant.mScrollX, 3697 descendant.mTop - descendant.mScrollY); 3698 } else { 3699 rect.offset(descendant.mScrollX - descendant.mLeft, 3700 descendant.mScrollY - descendant.mTop); 3701 } 3702 } else { 3703 throw new IllegalArgumentException("parameter must be a descendant of this view"); 3704 } 3705 } 3706 3707 /** 3708 * Offset the vertical location of all children of this view by the specified number of pixels. 3709 * 3710 * @param offset the number of pixels to offset 3711 * 3712 * @hide 3713 */ 3714 public void offsetChildrenTopAndBottom(int offset) { 3715 final int count = mChildrenCount; 3716 final View[] children = mChildren; 3717 3718 for (int i = 0; i < count; i++) { 3719 final View v = children[i]; 3720 v.mTop += offset; 3721 v.mBottom += offset; 3722 } 3723 } 3724 3725 /** 3726 * {@inheritDoc} 3727 */ 3728 public boolean getChildVisibleRect(View child, Rect r, android.graphics.Point offset) { 3729 int dx = child.mLeft - mScrollX; 3730 int dy = child.mTop - mScrollY; 3731 if (offset != null) { 3732 offset.x += dx; 3733 offset.y += dy; 3734 } 3735 r.offset(dx, dy); 3736 return r.intersect(0, 0, mRight - mLeft, mBottom - mTop) && 3737 (mParent == null || mParent.getChildVisibleRect(this, r, offset)); 3738 } 3739 3740 /** 3741 * {@inheritDoc} 3742 */ 3743 @Override 3744 public final void layout(int l, int t, int r, int b) { 3745 if (mTransition == null || !mTransition.isChangingLayout()) { 3746 super.layout(l, t, r, b); 3747 } else { 3748 // record the fact that we noop'd it; request layout when transition finishes 3749 mLayoutSuppressed = true; 3750 } 3751 } 3752 3753 /** 3754 * {@inheritDoc} 3755 */ 3756 @Override 3757 protected abstract void onLayout(boolean changed, 3758 int l, int t, int r, int b); 3759 3760 /** 3761 * Indicates whether the view group has the ability to animate its children 3762 * after the first layout. 3763 * 3764 * @return true if the children can be animated, false otherwise 3765 */ 3766 protected boolean canAnimate() { 3767 return mLayoutAnimationController != null; 3768 } 3769 3770 /** 3771 * Runs the layout animation. Calling this method triggers a relayout of 3772 * this view group. 3773 */ 3774 public void startLayoutAnimation() { 3775 if (mLayoutAnimationController != null) { 3776 mGroupFlags |= FLAG_RUN_ANIMATION; 3777 requestLayout(); 3778 } 3779 } 3780 3781 /** 3782 * Schedules the layout animation to be played after the next layout pass 3783 * of this view group. This can be used to restart the layout animation 3784 * when the content of the view group changes or when the activity is 3785 * paused and resumed. 3786 */ 3787 public void scheduleLayoutAnimation() { 3788 mGroupFlags |= FLAG_RUN_ANIMATION; 3789 } 3790 3791 /** 3792 * Sets the layout animation controller used to animate the group's 3793 * children after the first layout. 3794 * 3795 * @param controller the animation controller 3796 */ 3797 public void setLayoutAnimation(LayoutAnimationController controller) { 3798 mLayoutAnimationController = controller; 3799 if (mLayoutAnimationController != null) { 3800 mGroupFlags |= FLAG_RUN_ANIMATION; 3801 } 3802 } 3803 3804 /** 3805 * Returns the layout animation controller used to animate the group's 3806 * children. 3807 * 3808 * @return the current animation controller 3809 */ 3810 public LayoutAnimationController getLayoutAnimation() { 3811 return mLayoutAnimationController; 3812 } 3813 3814 /** 3815 * Indicates whether the children's drawing cache is used during a layout 3816 * animation. By default, the drawing cache is enabled but this will prevent 3817 * nested layout animations from working. To nest animations, you must disable 3818 * the cache. 3819 * 3820 * @return true if the animation cache is enabled, false otherwise 3821 * 3822 * @see #setAnimationCacheEnabled(boolean) 3823 * @see View#setDrawingCacheEnabled(boolean) 3824 */ 3825 @ViewDebug.ExportedProperty 3826 public boolean isAnimationCacheEnabled() { 3827 return (mGroupFlags & FLAG_ANIMATION_CACHE) == FLAG_ANIMATION_CACHE; 3828 } 3829 3830 /** 3831 * Enables or disables the children's drawing cache during a layout animation. 3832 * By default, the drawing cache is enabled but this will prevent nested 3833 * layout animations from working. To nest animations, you must disable the 3834 * cache. 3835 * 3836 * @param enabled true to enable the animation cache, false otherwise 3837 * 3838 * @see #isAnimationCacheEnabled() 3839 * @see View#setDrawingCacheEnabled(boolean) 3840 */ 3841 public void setAnimationCacheEnabled(boolean enabled) { 3842 setBooleanFlag(FLAG_ANIMATION_CACHE, enabled); 3843 } 3844 3845 /** 3846 * Indicates whether this ViewGroup will always try to draw its children using their 3847 * drawing cache. By default this property is enabled. 3848 * 3849 * @return true if the animation cache is enabled, false otherwise 3850 * 3851 * @see #setAlwaysDrawnWithCacheEnabled(boolean) 3852 * @see #setChildrenDrawnWithCacheEnabled(boolean) 3853 * @see View#setDrawingCacheEnabled(boolean) 3854 */ 3855 @ViewDebug.ExportedProperty(category = "drawing") 3856 public boolean isAlwaysDrawnWithCacheEnabled() { 3857 return (mGroupFlags & FLAG_ALWAYS_DRAWN_WITH_CACHE) == FLAG_ALWAYS_DRAWN_WITH_CACHE; 3858 } 3859 3860 /** 3861 * Indicates whether this ViewGroup will always try to draw its children using their 3862 * drawing cache. This property can be set to true when the cache rendering is 3863 * slightly different from the children's normal rendering. Renderings can be different, 3864 * for instance, when the cache's quality is set to low. 3865 * 3866 * When this property is disabled, the ViewGroup will use the drawing cache of its 3867 * children only when asked to. It's usually the task of subclasses to tell ViewGroup 3868 * when to start using the drawing cache and when to stop using it. 3869 * 3870 * @param always true to always draw with the drawing cache, false otherwise 3871 * 3872 * @see #isAlwaysDrawnWithCacheEnabled() 3873 * @see #setChildrenDrawnWithCacheEnabled(boolean) 3874 * @see View#setDrawingCacheEnabled(boolean) 3875 * @see View#setDrawingCacheQuality(int) 3876 */ 3877 public void setAlwaysDrawnWithCacheEnabled(boolean always) { 3878 setBooleanFlag(FLAG_ALWAYS_DRAWN_WITH_CACHE, always); 3879 } 3880 3881 /** 3882 * Indicates whether the ViewGroup is currently drawing its children using 3883 * their drawing cache. 3884 * 3885 * @return true if children should be drawn with their cache, false otherwise 3886 * 3887 * @see #setAlwaysDrawnWithCacheEnabled(boolean) 3888 * @see #setChildrenDrawnWithCacheEnabled(boolean) 3889 */ 3890 @ViewDebug.ExportedProperty(category = "drawing") 3891 protected boolean isChildrenDrawnWithCacheEnabled() { 3892 return (mGroupFlags & FLAG_CHILDREN_DRAWN_WITH_CACHE) == FLAG_CHILDREN_DRAWN_WITH_CACHE; 3893 } 3894 3895 /** 3896 * Tells the ViewGroup to draw its children using their drawing cache. This property 3897 * is ignored when {@link #isAlwaysDrawnWithCacheEnabled()} is true. A child's drawing cache 3898 * will be used only if it has been enabled. 3899 * 3900 * Subclasses should call this method to start and stop using the drawing cache when 3901 * they perform performance sensitive operations, like scrolling or animating. 3902 * 3903 * @param enabled true if children should be drawn with their cache, false otherwise 3904 * 3905 * @see #setAlwaysDrawnWithCacheEnabled(boolean) 3906 * @see #isChildrenDrawnWithCacheEnabled() 3907 */ 3908 protected void setChildrenDrawnWithCacheEnabled(boolean enabled) { 3909 setBooleanFlag(FLAG_CHILDREN_DRAWN_WITH_CACHE, enabled); 3910 } 3911 3912 /** 3913 * Indicates whether the ViewGroup is drawing its children in the order defined by 3914 * {@link #getChildDrawingOrder(int, int)}. 3915 * 3916 * @return true if children drawing order is defined by {@link #getChildDrawingOrder(int, int)}, 3917 * false otherwise 3918 * 3919 * @see #setChildrenDrawingOrderEnabled(boolean) 3920 * @see #getChildDrawingOrder(int, int) 3921 */ 3922 @ViewDebug.ExportedProperty(category = "drawing") 3923 protected boolean isChildrenDrawingOrderEnabled() { 3924 return (mGroupFlags & FLAG_USE_CHILD_DRAWING_ORDER) == FLAG_USE_CHILD_DRAWING_ORDER; 3925 } 3926 3927 /** 3928 * Tells the ViewGroup whether to draw its children in the order defined by the method 3929 * {@link #getChildDrawingOrder(int, int)}. 3930 * 3931 * @param enabled true if the order of the children when drawing is determined by 3932 * {@link #getChildDrawingOrder(int, int)}, false otherwise 3933 * 3934 * @see #isChildrenDrawingOrderEnabled() 3935 * @see #getChildDrawingOrder(int, int) 3936 */ 3937 protected void setChildrenDrawingOrderEnabled(boolean enabled) { 3938 setBooleanFlag(FLAG_USE_CHILD_DRAWING_ORDER, enabled); 3939 } 3940 3941 private void setBooleanFlag(int flag, boolean value) { 3942 if (value) { 3943 mGroupFlags |= flag; 3944 } else { 3945 mGroupFlags &= ~flag; 3946 } 3947 } 3948 3949 /** 3950 * Returns an integer indicating what types of drawing caches are kept in memory. 3951 * 3952 * @see #setPersistentDrawingCache(int) 3953 * @see #setAnimationCacheEnabled(boolean) 3954 * 3955 * @return one or a combination of {@link #PERSISTENT_NO_CACHE}, 3956 * {@link #PERSISTENT_ANIMATION_CACHE}, {@link #PERSISTENT_SCROLLING_CACHE} 3957 * and {@link #PERSISTENT_ALL_CACHES} 3958 */ 3959 @ViewDebug.ExportedProperty(category = "drawing", mapping = { 3960 @ViewDebug.IntToString(from = PERSISTENT_NO_CACHE, to = "NONE"), 3961 @ViewDebug.IntToString(from = PERSISTENT_ANIMATION_CACHE, to = "ANIMATION"), 3962 @ViewDebug.IntToString(from = PERSISTENT_SCROLLING_CACHE, to = "SCROLLING"), 3963 @ViewDebug.IntToString(from = PERSISTENT_ALL_CACHES, to = "ALL") 3964 }) 3965 public int getPersistentDrawingCache() { 3966 return mPersistentDrawingCache; 3967 } 3968 3969 /** 3970 * Indicates what types of drawing caches should be kept in memory after 3971 * they have been created. 3972 * 3973 * @see #getPersistentDrawingCache() 3974 * @see #setAnimationCacheEnabled(boolean) 3975 * 3976 * @param drawingCacheToKeep one or a combination of {@link #PERSISTENT_NO_CACHE}, 3977 * {@link #PERSISTENT_ANIMATION_CACHE}, {@link #PERSISTENT_SCROLLING_CACHE} 3978 * and {@link #PERSISTENT_ALL_CACHES} 3979 */ 3980 public void setPersistentDrawingCache(int drawingCacheToKeep) { 3981 mPersistentDrawingCache = drawingCacheToKeep & PERSISTENT_ALL_CACHES; 3982 } 3983 3984 /** 3985 * Returns a new set of layout parameters based on the supplied attributes set. 3986 * 3987 * @param attrs the attributes to build the layout parameters from 3988 * 3989 * @return an instance of {@link android.view.ViewGroup.LayoutParams} or one 3990 * of its descendants 3991 */ 3992 public LayoutParams generateLayoutParams(AttributeSet attrs) { 3993 return new LayoutParams(getContext(), attrs); 3994 } 3995 3996 /** 3997 * Returns a safe set of layout parameters based on the supplied layout params. 3998 * When a ViewGroup is passed a View whose layout params do not pass the test of 3999 * {@link #checkLayoutParams(android.view.ViewGroup.LayoutParams)}, this method 4000 * is invoked. This method should return a new set of layout params suitable for 4001 * this ViewGroup, possibly by copying the appropriate attributes from the 4002 * specified set of layout params. 4003 * 4004 * @param p The layout parameters to convert into a suitable set of layout parameters 4005 * for this ViewGroup. 4006 * 4007 * @return an instance of {@link android.view.ViewGroup.LayoutParams} or one 4008 * of its descendants 4009 */ 4010 protected LayoutParams generateLayoutParams(ViewGroup.LayoutParams p) { 4011 return p; 4012 } 4013 4014 /** 4015 * Returns a set of default layout parameters. These parameters are requested 4016 * when the View passed to {@link #addView(View)} has no layout parameters 4017 * already set. If null is returned, an exception is thrown from addView. 4018 * 4019 * @return a set of default layout parameters or null 4020 */ 4021 protected LayoutParams generateDefaultLayoutParams() { 4022 return new LayoutParams(LayoutParams.WRAP_CONTENT, LayoutParams.WRAP_CONTENT); 4023 } 4024 4025 /** 4026 * @hide 4027 */ 4028 @Override 4029 protected boolean dispatchConsistencyCheck(int consistency) { 4030 boolean result = super.dispatchConsistencyCheck(consistency); 4031 4032 final int count = mChildrenCount; 4033 final View[] children = mChildren; 4034 for (int i = 0; i < count; i++) { 4035 if (!children[i].dispatchConsistencyCheck(consistency)) result = false; 4036 } 4037 4038 return result; 4039 } 4040 4041 /** 4042 * @hide 4043 */ 4044 @Override 4045 protected boolean onConsistencyCheck(int consistency) { 4046 boolean result = super.onConsistencyCheck(consistency); 4047 4048 final boolean checkLayout = (consistency & ViewDebug.CONSISTENCY_LAYOUT) != 0; 4049 final boolean checkDrawing = (consistency & ViewDebug.CONSISTENCY_DRAWING) != 0; 4050 4051 if (checkLayout) { 4052 final int count = mChildrenCount; 4053 final View[] children = mChildren; 4054 for (int i = 0; i < count; i++) { 4055 if (children[i].getParent() != this) { 4056 result = false; 4057 android.util.Log.d(ViewDebug.CONSISTENCY_LOG_TAG, 4058 "View " + children[i] + " has no parent/a parent that is not " + this); 4059 } 4060 } 4061 } 4062 4063 if (checkDrawing) { 4064 // If this group is dirty, check that the parent is dirty as well 4065 if ((mPrivateFlags & DIRTY_MASK) != 0) { 4066 final ViewParent parent = getParent(); 4067 if (parent != null && !(parent instanceof ViewRoot)) { 4068 if ((((View) parent).mPrivateFlags & DIRTY_MASK) == 0) { 4069 result = false; 4070 android.util.Log.d(ViewDebug.CONSISTENCY_LOG_TAG, 4071 "ViewGroup " + this + " is dirty but its parent is not: " + this); 4072 } 4073 } 4074 } 4075 } 4076 4077 return result; 4078 } 4079 4080 /** 4081 * {@inheritDoc} 4082 */ 4083 @Override 4084 protected void debug(int depth) { 4085 super.debug(depth); 4086 String output; 4087 4088 if (mFocused != null) { 4089 output = debugIndent(depth); 4090 output += "mFocused"; 4091 Log.d(VIEW_LOG_TAG, output); 4092 } 4093 if (mChildrenCount != 0) { 4094 output = debugIndent(depth); 4095 output += "{"; 4096 Log.d(VIEW_LOG_TAG, output); 4097 } 4098 int count = mChildrenCount; 4099 for (int i = 0; i < count; i++) { 4100 View child = mChildren[i]; 4101 child.debug(depth + 1); 4102 } 4103 4104 if (mChildrenCount != 0) { 4105 output = debugIndent(depth); 4106 output += "}"; 4107 Log.d(VIEW_LOG_TAG, output); 4108 } 4109 } 4110 4111 /** 4112 * Returns the position in the group of the specified child view. 4113 * 4114 * @param child the view for which to get the position 4115 * @return a positive integer representing the position of the view in the 4116 * group, or -1 if the view does not exist in the group 4117 */ 4118 public int indexOfChild(View child) { 4119 final int count = mChildrenCount; 4120 final View[] children = mChildren; 4121 for (int i = 0; i < count; i++) { 4122 if (children[i] == child) { 4123 return i; 4124 } 4125 } 4126 return -1; 4127 } 4128 4129 /** 4130 * Returns the number of children in the group. 4131 * 4132 * @return a positive integer representing the number of children in 4133 * the group 4134 */ 4135 public int getChildCount() { 4136 return mChildrenCount; 4137 } 4138 4139 /** 4140 * Returns the view at the specified position in the group. 4141 * 4142 * @param index the position at which to get the view from 4143 * @return the view at the specified position or null if the position 4144 * does not exist within the group 4145 */ 4146 public View getChildAt(int index) { 4147 try { 4148 return mChildren[index]; 4149 } catch (IndexOutOfBoundsException ex) { 4150 return null; 4151 } 4152 } 4153 4154 /** 4155 * Ask all of the children of this view to measure themselves, taking into 4156 * account both the MeasureSpec requirements for this view and its padding. 4157 * We skip children that are in the GONE state The heavy lifting is done in 4158 * getChildMeasureSpec. 4159 * 4160 * @param widthMeasureSpec The width requirements for this view 4161 * @param heightMeasureSpec The height requirements for this view 4162 */ 4163 protected void measureChildren(int widthMeasureSpec, int heightMeasureSpec) { 4164 final int size = mChildrenCount; 4165 final View[] children = mChildren; 4166 for (int i = 0; i < size; ++i) { 4167 final View child = children[i]; 4168 if ((child.mViewFlags & VISIBILITY_MASK) != GONE) { 4169 measureChild(child, widthMeasureSpec, heightMeasureSpec); 4170 } 4171 } 4172 } 4173 4174 /** 4175 * Ask one of the children of this view to measure itself, taking into 4176 * account both the MeasureSpec requirements for this view and its padding. 4177 * The heavy lifting is done in getChildMeasureSpec. 4178 * 4179 * @param child The child to measure 4180 * @param parentWidthMeasureSpec The width requirements for this view 4181 * @param parentHeightMeasureSpec The height requirements for this view 4182 */ 4183 protected void measureChild(View child, int parentWidthMeasureSpec, 4184 int parentHeightMeasureSpec) { 4185 final LayoutParams lp = child.getLayoutParams(); 4186 4187 final int childWidthMeasureSpec = getChildMeasureSpec(parentWidthMeasureSpec, 4188 mPaddingLeft + mPaddingRight, lp.width); 4189 final int childHeightMeasureSpec = getChildMeasureSpec(parentHeightMeasureSpec, 4190 mPaddingTop + mPaddingBottom, lp.height); 4191 4192 child.measure(childWidthMeasureSpec, childHeightMeasureSpec); 4193 } 4194 4195 /** 4196 * Ask one of the children of this view to measure itself, taking into 4197 * account both the MeasureSpec requirements for this view and its padding 4198 * and margins. The child must have MarginLayoutParams The heavy lifting is 4199 * done in getChildMeasureSpec. 4200 * 4201 * @param child The child to measure 4202 * @param parentWidthMeasureSpec The width requirements for this view 4203 * @param widthUsed Extra space that has been used up by the parent 4204 * horizontally (possibly by other children of the parent) 4205 * @param parentHeightMeasureSpec The height requirements for this view 4206 * @param heightUsed Extra space that has been used up by the parent 4207 * vertically (possibly by other children of the parent) 4208 */ 4209 protected void measureChildWithMargins(View child, 4210 int parentWidthMeasureSpec, int widthUsed, 4211 int parentHeightMeasureSpec, int heightUsed) { 4212 final MarginLayoutParams lp = (MarginLayoutParams) child.getLayoutParams(); 4213 4214 final int childWidthMeasureSpec = getChildMeasureSpec(parentWidthMeasureSpec, 4215 mPaddingLeft + mPaddingRight + lp.leftMargin + lp.rightMargin 4216 + widthUsed, lp.width); 4217 final int childHeightMeasureSpec = getChildMeasureSpec(parentHeightMeasureSpec, 4218 mPaddingTop + mPaddingBottom + lp.topMargin + lp.bottomMargin 4219 + heightUsed, lp.height); 4220 4221 child.measure(childWidthMeasureSpec, childHeightMeasureSpec); 4222 } 4223 4224 /** 4225 * Does the hard part of measureChildren: figuring out the MeasureSpec to 4226 * pass to a particular child. This method figures out the right MeasureSpec 4227 * for one dimension (height or width) of one child view. 4228 * 4229 * The goal is to combine information from our MeasureSpec with the 4230 * LayoutParams of the child to get the best possible results. For example, 4231 * if the this view knows its size (because its MeasureSpec has a mode of 4232 * EXACTLY), and the child has indicated in its LayoutParams that it wants 4233 * to be the same size as the parent, the parent should ask the child to 4234 * layout given an exact size. 4235 * 4236 * @param spec The requirements for this view 4237 * @param padding The padding of this view for the current dimension and 4238 * margins, if applicable 4239 * @param childDimension How big the child wants to be in the current 4240 * dimension 4241 * @return a MeasureSpec integer for the child 4242 */ 4243 public static int getChildMeasureSpec(int spec, int padding, int childDimension) { 4244 int specMode = MeasureSpec.getMode(spec); 4245 int specSize = MeasureSpec.getSize(spec); 4246 4247 int size = Math.max(0, specSize - padding); 4248 4249 int resultSize = 0; 4250 int resultMode = 0; 4251 4252 switch (specMode) { 4253 // Parent has imposed an exact size on us 4254 case MeasureSpec.EXACTLY: 4255 if (childDimension >= 0) { 4256 resultSize = childDimension; 4257 resultMode = MeasureSpec.EXACTLY; 4258 } else if (childDimension == LayoutParams.MATCH_PARENT) { 4259 // Child wants to be our size. So be it. 4260 resultSize = size; 4261 resultMode = MeasureSpec.EXACTLY; 4262 } else if (childDimension == LayoutParams.WRAP_CONTENT) { 4263 // Child wants to determine its own size. It can't be 4264 // bigger than us. 4265 resultSize = size; 4266 resultMode = MeasureSpec.AT_MOST; 4267 } 4268 break; 4269 4270 // Parent has imposed a maximum size on us 4271 case MeasureSpec.AT_MOST: 4272 if (childDimension >= 0) { 4273 // Child wants a specific size... so be it 4274 resultSize = childDimension; 4275 resultMode = MeasureSpec.EXACTLY; 4276 } else if (childDimension == LayoutParams.MATCH_PARENT) { 4277 // Child wants to be our size, but our size is not fixed. 4278 // Constrain child to not be bigger than us. 4279 resultSize = size; 4280 resultMode = MeasureSpec.AT_MOST; 4281 } else if (childDimension == LayoutParams.WRAP_CONTENT) { 4282 // Child wants to determine its own size. It can't be 4283 // bigger than us. 4284 resultSize = size; 4285 resultMode = MeasureSpec.AT_MOST; 4286 } 4287 break; 4288 4289 // Parent asked to see how big we want to be 4290 case MeasureSpec.UNSPECIFIED: 4291 if (childDimension >= 0) { 4292 // Child wants a specific size... let him have it 4293 resultSize = childDimension; 4294 resultMode = MeasureSpec.EXACTLY; 4295 } else if (childDimension == LayoutParams.MATCH_PARENT) { 4296 // Child wants to be our size... find out how big it should 4297 // be 4298 resultSize = 0; 4299 resultMode = MeasureSpec.UNSPECIFIED; 4300 } else if (childDimension == LayoutParams.WRAP_CONTENT) { 4301 // Child wants to determine its own size.... find out how 4302 // big it should be 4303 resultSize = 0; 4304 resultMode = MeasureSpec.UNSPECIFIED; 4305 } 4306 break; 4307 } 4308 return MeasureSpec.makeMeasureSpec(resultSize, resultMode); 4309 } 4310 4311 4312 /** 4313 * Removes any pending animations for views that have been removed. Call 4314 * this if you don't want animations for exiting views to stack up. 4315 */ 4316 public void clearDisappearingChildren() { 4317 if (mDisappearingChildren != null) { 4318 mDisappearingChildren.clear(); 4319 } 4320 } 4321 4322 /** 4323 * Add a view which is removed from mChildren but still needs animation 4324 * 4325 * @param v View to add 4326 */ 4327 private void addDisappearingView(View v) { 4328 ArrayList<View> disappearingChildren = mDisappearingChildren; 4329 4330 if (disappearingChildren == null) { 4331 disappearingChildren = mDisappearingChildren = new ArrayList<View>(); 4332 } 4333 4334 disappearingChildren.add(v); 4335 } 4336 4337 /** 4338 * Cleanup a view when its animation is done. This may mean removing it from 4339 * the list of disappearing views. 4340 * 4341 * @param view The view whose animation has finished 4342 * @param animation The animation, cannot be null 4343 */ 4344 private void finishAnimatingView(final View view, Animation animation) { 4345 final ArrayList<View> disappearingChildren = mDisappearingChildren; 4346 if (disappearingChildren != null) { 4347 if (disappearingChildren.contains(view)) { 4348 disappearingChildren.remove(view); 4349 4350 if (view.mAttachInfo != null) { 4351 view.dispatchDetachedFromWindow(); 4352 } 4353 4354 view.clearAnimation(); 4355 mGroupFlags |= FLAG_INVALIDATE_REQUIRED; 4356 } 4357 } 4358 4359 if (animation != null && !animation.getFillAfter()) { 4360 view.clearAnimation(); 4361 } 4362 4363 if ((view.mPrivateFlags & ANIMATION_STARTED) == ANIMATION_STARTED) { 4364 view.onAnimationEnd(); 4365 // Should be performed by onAnimationEnd() but this avoid an infinite loop, 4366 // so we'd rather be safe than sorry 4367 view.mPrivateFlags &= ~ANIMATION_STARTED; 4368 // Draw one more frame after the animation is done 4369 mGroupFlags |= FLAG_INVALIDATE_REQUIRED; 4370 } 4371 } 4372 4373 /** 4374 * This method tells the ViewGroup that the given View object, which should have this 4375 * ViewGroup as its parent, 4376 * should be kept around (re-displayed when the ViewGroup draws its children) even if it 4377 * is removed from its parent. This allows animations, such as those used by 4378 * {@link android.app.Fragment} and {@link android.animation.LayoutTransition} to animate 4379 * the removal of views. A call to this method should always be accompanied by a later call 4380 * to {@link #endViewTransition(View)}, such as after an animation on the View has finished, 4381 * so that the View finally gets removed. 4382 * 4383 * @param view The View object to be kept visible even if it gets removed from its parent. 4384 */ 4385 public void startViewTransition(View view) { 4386 if (view.mParent == this) { 4387 if (mTransitioningViews == null) { 4388 mTransitioningViews = new ArrayList<View>(); 4389 } 4390 mTransitioningViews.add(view); 4391 } 4392 } 4393 4394 /** 4395 * This method should always be called following an earlier call to 4396 * {@link #startViewTransition(View)}. The given View is finally removed from its parent 4397 * and will no longer be displayed. Note that this method does not perform the functionality 4398 * of removing a view from its parent; it just discontinues the display of a View that 4399 * has previously been removed. 4400 * 4401 * @return view The View object that has been removed but is being kept around in the visible 4402 * hierarchy by an earlier call to {@link #startViewTransition(View)}. 4403 */ 4404 public void endViewTransition(View view) { 4405 if (mTransitioningViews != null) { 4406 mTransitioningViews.remove(view); 4407 final ArrayList<View> disappearingChildren = mDisappearingChildren; 4408 if (disappearingChildren != null && disappearingChildren.contains(view)) { 4409 disappearingChildren.remove(view); 4410 if (mVisibilityChangingChildren != null && 4411 mVisibilityChangingChildren.contains(view)) { 4412 mVisibilityChangingChildren.remove(view); 4413 } else { 4414 if (view.mAttachInfo != null) { 4415 view.dispatchDetachedFromWindow(); 4416 } 4417 if (view.mParent != null) { 4418 view.mParent = null; 4419 } 4420 } 4421 mGroupFlags |= FLAG_INVALIDATE_REQUIRED; 4422 } 4423 } 4424 } 4425 4426 private LayoutTransition.TransitionListener mLayoutTransitionListener = 4427 new LayoutTransition.TransitionListener() { 4428 @Override 4429 public void startTransition(LayoutTransition transition, ViewGroup container, 4430 View view, int transitionType) { 4431 // We only care about disappearing items, since we need special logic to keep 4432 // those items visible after they've been 'removed' 4433 if (transitionType == LayoutTransition.DISAPPEARING) { 4434 startViewTransition(view); 4435 } 4436 } 4437 4438 @Override 4439 public void endTransition(LayoutTransition transition, ViewGroup container, 4440 View view, int transitionType) { 4441 if (mLayoutSuppressed && !transition.isChangingLayout()) { 4442 requestLayout(); 4443 mLayoutSuppressed = false; 4444 } 4445 if (transitionType == LayoutTransition.DISAPPEARING && mTransitioningViews != null) { 4446 endViewTransition(view); 4447 } 4448 } 4449 }; 4450 4451 /** 4452 * {@inheritDoc} 4453 */ 4454 @Override 4455 public boolean gatherTransparentRegion(Region region) { 4456 // If no transparent regions requested, we are always opaque. 4457 final boolean meOpaque = (mPrivateFlags & View.REQUEST_TRANSPARENT_REGIONS) == 0; 4458 if (meOpaque && region == null) { 4459 // The caller doesn't care about the region, so stop now. 4460 return true; 4461 } 4462 super.gatherTransparentRegion(region); 4463 final View[] children = mChildren; 4464 final int count = mChildrenCount; 4465 boolean noneOfTheChildrenAreTransparent = true; 4466 for (int i = 0; i < count; i++) { 4467 final View child = children[i]; 4468 if ((child.mViewFlags & VISIBILITY_MASK) == VISIBLE || child.getAnimation() != null) { 4469 if (!child.gatherTransparentRegion(region)) { 4470 noneOfTheChildrenAreTransparent = false; 4471 } 4472 } 4473 } 4474 return meOpaque || noneOfTheChildrenAreTransparent; 4475 } 4476 4477 /** 4478 * {@inheritDoc} 4479 */ 4480 public void requestTransparentRegion(View child) { 4481 if (child != null) { 4482 child.mPrivateFlags |= View.REQUEST_TRANSPARENT_REGIONS; 4483 if (mParent != null) { 4484 mParent.requestTransparentRegion(this); 4485 } 4486 } 4487 } 4488 4489 4490 @Override 4491 protected boolean fitSystemWindows(Rect insets) { 4492 boolean done = super.fitSystemWindows(insets); 4493 if (!done) { 4494 final int count = mChildrenCount; 4495 final View[] children = mChildren; 4496 for (int i = 0; i < count; i++) { 4497 done = children[i].fitSystemWindows(insets); 4498 if (done) { 4499 break; 4500 } 4501 } 4502 } 4503 return done; 4504 } 4505 4506 /** 4507 * Returns the animation listener to which layout animation events are 4508 * sent. 4509 * 4510 * @return an {@link android.view.animation.Animation.AnimationListener} 4511 */ 4512 public Animation.AnimationListener getLayoutAnimationListener() { 4513 return mAnimationListener; 4514 } 4515 4516 @Override 4517 protected void drawableStateChanged() { 4518 super.drawableStateChanged(); 4519 4520 if ((mGroupFlags & FLAG_NOTIFY_CHILDREN_ON_DRAWABLE_STATE_CHANGE) != 0) { 4521 if ((mGroupFlags & FLAG_ADD_STATES_FROM_CHILDREN) != 0) { 4522 throw new IllegalStateException("addStateFromChildren cannot be enabled if a" 4523 + " child has duplicateParentState set to true"); 4524 } 4525 4526 final View[] children = mChildren; 4527 final int count = mChildrenCount; 4528 4529 for (int i = 0; i < count; i++) { 4530 final View child = children[i]; 4531 if ((child.mViewFlags & DUPLICATE_PARENT_STATE) != 0) { 4532 child.refreshDrawableState(); 4533 } 4534 } 4535 } 4536 } 4537 4538 @Override 4539 public void jumpDrawablesToCurrentState() { 4540 super.jumpDrawablesToCurrentState(); 4541 final View[] children = mChildren; 4542 final int count = mChildrenCount; 4543 for (int i = 0; i < count; i++) { 4544 children[i].jumpDrawablesToCurrentState(); 4545 } 4546 } 4547 4548 @Override 4549 protected int[] onCreateDrawableState(int extraSpace) { 4550 if ((mGroupFlags & FLAG_ADD_STATES_FROM_CHILDREN) == 0) { 4551 return super.onCreateDrawableState(extraSpace); 4552 } 4553 4554 int need = 0; 4555 int n = getChildCount(); 4556 for (int i = 0; i < n; i++) { 4557 int[] childState = getChildAt(i).getDrawableState(); 4558 4559 if (childState != null) { 4560 need += childState.length; 4561 } 4562 } 4563 4564 int[] state = super.onCreateDrawableState(extraSpace + need); 4565 4566 for (int i = 0; i < n; i++) { 4567 int[] childState = getChildAt(i).getDrawableState(); 4568 4569 if (childState != null) { 4570 state = mergeDrawableStates(state, childState); 4571 } 4572 } 4573 4574 return state; 4575 } 4576 4577 /** 4578 * Sets whether this ViewGroup's drawable states also include 4579 * its children's drawable states. This is used, for example, to 4580 * make a group appear to be focused when its child EditText or button 4581 * is focused. 4582 */ 4583 public void setAddStatesFromChildren(boolean addsStates) { 4584 if (addsStates) { 4585 mGroupFlags |= FLAG_ADD_STATES_FROM_CHILDREN; 4586 } else { 4587 mGroupFlags &= ~FLAG_ADD_STATES_FROM_CHILDREN; 4588 } 4589 4590 refreshDrawableState(); 4591 } 4592 4593 /** 4594 * Returns whether this ViewGroup's drawable states also include 4595 * its children's drawable states. This is used, for example, to 4596 * make a group appear to be focused when its child EditText or button 4597 * is focused. 4598 */ 4599 public boolean addStatesFromChildren() { 4600 return (mGroupFlags & FLAG_ADD_STATES_FROM_CHILDREN) != 0; 4601 } 4602 4603 /** 4604 * If {link #addStatesFromChildren} is true, refreshes this group's 4605 * drawable state (to include the states from its children). 4606 */ 4607 public void childDrawableStateChanged(View child) { 4608 if ((mGroupFlags & FLAG_ADD_STATES_FROM_CHILDREN) != 0) { 4609 refreshDrawableState(); 4610 } 4611 } 4612 4613 /** 4614 * Specifies the animation listener to which layout animation events must 4615 * be sent. Only 4616 * {@link android.view.animation.Animation.AnimationListener#onAnimationStart(Animation)} 4617 * and 4618 * {@link android.view.animation.Animation.AnimationListener#onAnimationEnd(Animation)} 4619 * are invoked. 4620 * 4621 * @param animationListener the layout animation listener 4622 */ 4623 public void setLayoutAnimationListener(Animation.AnimationListener animationListener) { 4624 mAnimationListener = animationListener; 4625 } 4626 4627 /** 4628 * LayoutParams are used by views to tell their parents how they want to be 4629 * laid out. See 4630 * {@link android.R.styleable#ViewGroup_Layout ViewGroup Layout Attributes} 4631 * for a list of all child view attributes that this class supports. 4632 * 4633 * <p> 4634 * The base LayoutParams class just describes how big the view wants to be 4635 * for both width and height. For each dimension, it can specify one of: 4636 * <ul> 4637 * <li>FILL_PARENT (renamed MATCH_PARENT in API Level 8 and higher), which 4638 * means that the view wants to be as big as its parent (minus padding) 4639 * <li> WRAP_CONTENT, which means that the view wants to be just big enough 4640 * to enclose its content (plus padding) 4641 * <li> an exact number 4642 * </ul> 4643 * There are subclasses of LayoutParams for different subclasses of 4644 * ViewGroup. For example, AbsoluteLayout has its own subclass of 4645 * LayoutParams which adds an X and Y value. 4646 * 4647 * @attr ref android.R.styleable#ViewGroup_Layout_layout_height 4648 * @attr ref android.R.styleable#ViewGroup_Layout_layout_width 4649 */ 4650 public static class LayoutParams { 4651 /** 4652 * Special value for the height or width requested by a View. 4653 * FILL_PARENT means that the view wants to be as big as its parent, 4654 * minus the parent's padding, if any. This value is deprecated 4655 * starting in API Level 8 and replaced by {@link #MATCH_PARENT}. 4656 */ 4657 @SuppressWarnings({"UnusedDeclaration"}) 4658 @Deprecated 4659 public static final int FILL_PARENT = -1; 4660 4661 /** 4662 * Special value for the height or width requested by a View. 4663 * MATCH_PARENT means that the view wants to be as big as its parent, 4664 * minus the parent's padding, if any. Introduced in API Level 8. 4665 */ 4666 public static final int MATCH_PARENT = -1; 4667 4668 /** 4669 * Special value for the height or width requested by a View. 4670 * WRAP_CONTENT means that the view wants to be just large enough to fit 4671 * its own internal content, taking its own padding into account. 4672 */ 4673 public static final int WRAP_CONTENT = -2; 4674 4675 /** 4676 * Information about how wide the view wants to be. Can be one of the 4677 * constants FILL_PARENT (replaced by MATCH_PARENT , 4678 * in API Level 8) or WRAP_CONTENT. or an exact size. 4679 */ 4680 @ViewDebug.ExportedProperty(category = "layout", mapping = { 4681 @ViewDebug.IntToString(from = MATCH_PARENT, to = "MATCH_PARENT"), 4682 @ViewDebug.IntToString(from = WRAP_CONTENT, to = "WRAP_CONTENT") 4683 }) 4684 public int width; 4685 4686 /** 4687 * Information about how tall the view wants to be. Can be one of the 4688 * constants FILL_PARENT (replaced by MATCH_PARENT , 4689 * in API Level 8) or WRAP_CONTENT. or an exact size. 4690 */ 4691 @ViewDebug.ExportedProperty(category = "layout", mapping = { 4692 @ViewDebug.IntToString(from = MATCH_PARENT, to = "MATCH_PARENT"), 4693 @ViewDebug.IntToString(from = WRAP_CONTENT, to = "WRAP_CONTENT") 4694 }) 4695 public int height; 4696 4697 /** 4698 * Used to animate layouts. 4699 */ 4700 public LayoutAnimationController.AnimationParameters layoutAnimationParameters; 4701 4702 /** 4703 * Creates a new set of layout parameters. The values are extracted from 4704 * the supplied attributes set and context. The XML attributes mapped 4705 * to this set of layout parameters are: 4706 * 4707 * <ul> 4708 * <li><code>layout_width</code>: the width, either an exact value, 4709 * {@link #WRAP_CONTENT}, or {@link #FILL_PARENT} (replaced by 4710 * {@link #MATCH_PARENT} in API Level 8)</li> 4711 * <li><code>layout_height</code>: the height, either an exact value, 4712 * {@link #WRAP_CONTENT}, or {@link #FILL_PARENT} (replaced by 4713 * {@link #MATCH_PARENT} in API Level 8)</li> 4714 * </ul> 4715 * 4716 * @param c the application environment 4717 * @param attrs the set of attributes from which to extract the layout 4718 * parameters' values 4719 */ 4720 public LayoutParams(Context c, AttributeSet attrs) { 4721 TypedArray a = c.obtainStyledAttributes(attrs, R.styleable.ViewGroup_Layout); 4722 setBaseAttributes(a, 4723 R.styleable.ViewGroup_Layout_layout_width, 4724 R.styleable.ViewGroup_Layout_layout_height); 4725 a.recycle(); 4726 } 4727 4728 /** 4729 * Creates a new set of layout parameters with the specified width 4730 * and height. 4731 * 4732 * @param width the width, either {@link #WRAP_CONTENT}, 4733 * {@link #FILL_PARENT} (replaced by {@link #MATCH_PARENT} in 4734 * API Level 8), or a fixed size in pixels 4735 * @param height the height, either {@link #WRAP_CONTENT}, 4736 * {@link #FILL_PARENT} (replaced by {@link #MATCH_PARENT} in 4737 * API Level 8), or a fixed size in pixels 4738 */ 4739 public LayoutParams(int width, int height) { 4740 this.width = width; 4741 this.height = height; 4742 } 4743 4744 /** 4745 * Copy constructor. Clones the width and height values of the source. 4746 * 4747 * @param source The layout params to copy from. 4748 */ 4749 public LayoutParams(LayoutParams source) { 4750 this.width = source.width; 4751 this.height = source.height; 4752 } 4753 4754 /** 4755 * Used internally by MarginLayoutParams. 4756 * @hide 4757 */ 4758 LayoutParams() { 4759 } 4760 4761 /** 4762 * Extracts the layout parameters from the supplied attributes. 4763 * 4764 * @param a the style attributes to extract the parameters from 4765 * @param widthAttr the identifier of the width attribute 4766 * @param heightAttr the identifier of the height attribute 4767 */ 4768 protected void setBaseAttributes(TypedArray a, int widthAttr, int heightAttr) { 4769 width = a.getLayoutDimension(widthAttr, "layout_width"); 4770 height = a.getLayoutDimension(heightAttr, "layout_height"); 4771 } 4772 4773 /** 4774 * Returns a String representation of this set of layout parameters. 4775 * 4776 * @param output the String to prepend to the internal representation 4777 * @return a String with the following format: output + 4778 * "ViewGroup.LayoutParams={ width=WIDTH, height=HEIGHT }" 4779 * 4780 * @hide 4781 */ 4782 public String debug(String output) { 4783 return output + "ViewGroup.LayoutParams={ width=" 4784 + sizeToString(width) + ", height=" + sizeToString(height) + " }"; 4785 } 4786 4787 /** 4788 * Converts the specified size to a readable String. 4789 * 4790 * @param size the size to convert 4791 * @return a String instance representing the supplied size 4792 * 4793 * @hide 4794 */ 4795 protected static String sizeToString(int size) { 4796 if (size == WRAP_CONTENT) { 4797 return "wrap-content"; 4798 } 4799 if (size == MATCH_PARENT) { 4800 return "match-parent"; 4801 } 4802 return String.valueOf(size); 4803 } 4804 } 4805 4806 /** 4807 * Per-child layout information for layouts that support margins. 4808 * See 4809 * {@link android.R.styleable#ViewGroup_MarginLayout ViewGroup Margin Layout Attributes} 4810 * for a list of all child view attributes that this class supports. 4811 */ 4812 public static class MarginLayoutParams extends ViewGroup.LayoutParams { 4813 /** 4814 * The left margin in pixels of the child. 4815 */ 4816 @ViewDebug.ExportedProperty(category = "layout") 4817 public int leftMargin; 4818 4819 /** 4820 * The top margin in pixels of the child. 4821 */ 4822 @ViewDebug.ExportedProperty(category = "layout") 4823 public int topMargin; 4824 4825 /** 4826 * The right margin in pixels of the child. 4827 */ 4828 @ViewDebug.ExportedProperty(category = "layout") 4829 public int rightMargin; 4830 4831 /** 4832 * The bottom margin in pixels of the child. 4833 */ 4834 @ViewDebug.ExportedProperty(category = "layout") 4835 public int bottomMargin; 4836 4837 /** 4838 * Creates a new set of layout parameters. The values are extracted from 4839 * the supplied attributes set and context. 4840 * 4841 * @param c the application environment 4842 * @param attrs the set of attributes from which to extract the layout 4843 * parameters' values 4844 */ 4845 public MarginLayoutParams(Context c, AttributeSet attrs) { 4846 super(); 4847 4848 TypedArray a = c.obtainStyledAttributes(attrs, R.styleable.ViewGroup_MarginLayout); 4849 setBaseAttributes(a, 4850 R.styleable.ViewGroup_MarginLayout_layout_width, 4851 R.styleable.ViewGroup_MarginLayout_layout_height); 4852 4853 int margin = a.getDimensionPixelSize( 4854 com.android.internal.R.styleable.ViewGroup_MarginLayout_layout_margin, -1); 4855 if (margin >= 0) { 4856 leftMargin = margin; 4857 topMargin = margin; 4858 rightMargin= margin; 4859 bottomMargin = margin; 4860 } else { 4861 leftMargin = a.getDimensionPixelSize( 4862 R.styleable.ViewGroup_MarginLayout_layout_marginLeft, 0); 4863 topMargin = a.getDimensionPixelSize( 4864 R.styleable.ViewGroup_MarginLayout_layout_marginTop, 0); 4865 rightMargin = a.getDimensionPixelSize( 4866 R.styleable.ViewGroup_MarginLayout_layout_marginRight, 0); 4867 bottomMargin = a.getDimensionPixelSize( 4868 R.styleable.ViewGroup_MarginLayout_layout_marginBottom, 0); 4869 } 4870 4871 a.recycle(); 4872 } 4873 4874 /** 4875 * {@inheritDoc} 4876 */ 4877 public MarginLayoutParams(int width, int height) { 4878 super(width, height); 4879 } 4880 4881 /** 4882 * Copy constructor. Clones the width, height and margin values of the source. 4883 * 4884 * @param source The layout params to copy from. 4885 */ 4886 public MarginLayoutParams(MarginLayoutParams source) { 4887 this.width = source.width; 4888 this.height = source.height; 4889 4890 this.leftMargin = source.leftMargin; 4891 this.topMargin = source.topMargin; 4892 this.rightMargin = source.rightMargin; 4893 this.bottomMargin = source.bottomMargin; 4894 } 4895 4896 /** 4897 * {@inheritDoc} 4898 */ 4899 public MarginLayoutParams(LayoutParams source) { 4900 super(source); 4901 } 4902 4903 /** 4904 * Sets the margins, in pixels. 4905 * 4906 * @param left the left margin size 4907 * @param top the top margin size 4908 * @param right the right margin size 4909 * @param bottom the bottom margin size 4910 * 4911 * @attr ref android.R.styleable#ViewGroup_MarginLayout_layout_marginLeft 4912 * @attr ref android.R.styleable#ViewGroup_MarginLayout_layout_marginTop 4913 * @attr ref android.R.styleable#ViewGroup_MarginLayout_layout_marginRight 4914 * @attr ref android.R.styleable#ViewGroup_MarginLayout_layout_marginBottom 4915 */ 4916 public void setMargins(int left, int top, int right, int bottom) { 4917 leftMargin = left; 4918 topMargin = top; 4919 rightMargin = right; 4920 bottomMargin = bottom; 4921 } 4922 } 4923 4924 /* Describes a touched view and the ids of the pointers that it has captured. 4925 * 4926 * This code assumes that pointer ids are always in the range 0..31 such that 4927 * it can use a bitfield to track which pointer ids are present. 4928 * As it happens, the lower layers of the input dispatch pipeline also use the 4929 * same trick so the assumption should be safe here... 4930 */ 4931 private static final class TouchTarget { 4932 private static final int MAX_RECYCLED = 32; 4933 private static final Object sRecycleLock = new Object(); 4934 private static TouchTarget sRecycleBin; 4935 private static int sRecycledCount; 4936 4937 public static final int ALL_POINTER_IDS = -1; // all ones 4938 4939 // The touched child view. 4940 public View child; 4941 4942 // The combined bit mask of pointer ids for all pointers captured by the target. 4943 public int pointerIdBits; 4944 4945 // The next target in the target list. 4946 public TouchTarget next; 4947 4948 private TouchTarget() { 4949 } 4950 4951 public static TouchTarget obtain(View child, int pointerIdBits) { 4952 final TouchTarget target; 4953 synchronized (sRecycleLock) { 4954 if (sRecycleBin == null) { 4955 target = new TouchTarget(); 4956 } else { 4957 target = sRecycleBin; 4958 sRecycleBin = target.next; 4959 sRecycledCount--; 4960 target.next = null; 4961 } 4962 } 4963 target.child = child; 4964 target.pointerIdBits = pointerIdBits; 4965 return target; 4966 } 4967 4968 public void recycle() { 4969 synchronized (sRecycleLock) { 4970 if (sRecycledCount < MAX_RECYCLED) { 4971 next = sRecycleBin; 4972 sRecycleBin = this; 4973 sRecycledCount += 1; 4974 } else { 4975 next = null; 4976 } 4977 child = null; 4978 } 4979 } 4980 } 4981} 4982