ViewGroup.java revision 678e0adbdbac5fa3f25ca8371fdff1b3182f67e9
1/* 2 * Copyright (C) 2006 The Android Open Source Project 3 * 4 * Licensed under the Apache License, Version 2.0 (the "License"); 5 * you may not use this file except in compliance with the License. 6 * You may obtain a copy of the License at 7 * 8 * http://www.apache.org/licenses/LICENSE-2.0 9 * 10 * Unless required by applicable law or agreed to in writing, software 11 * distributed under the License is distributed on an "AS IS" BASIS, 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 13 * See the License for the specific language governing permissions and 14 * limitations under the License. 15 */ 16 17package android.view; 18 19import android.animation.LayoutTransition; 20import android.view.animation.AlphaAnimation; 21import com.android.internal.R; 22import com.android.internal.util.Predicate; 23 24import android.content.Context; 25import android.content.res.Configuration; 26import android.content.res.TypedArray; 27import android.graphics.Bitmap; 28import android.graphics.Canvas; 29import android.graphics.Matrix; 30import android.graphics.Paint; 31import android.graphics.PointF; 32import android.graphics.Rect; 33import android.graphics.RectF; 34import android.graphics.Region; 35import android.os.Build; 36import android.os.Parcelable; 37import android.os.SystemClock; 38import android.util.AttributeSet; 39import android.util.Log; 40import android.util.SparseArray; 41import android.view.accessibility.AccessibilityEvent; 42import android.view.animation.Animation; 43import android.view.animation.AnimationUtils; 44import android.view.animation.LayoutAnimationController; 45import android.view.animation.Transformation; 46 47import java.util.ArrayList; 48import java.util.HashSet; 49 50/** 51 * <p> 52 * A <code>ViewGroup</code> is a special view that can contain other views 53 * (called children.) The view group is the base class for layouts and views 54 * containers. This class also defines the 55 * {@link android.view.ViewGroup.LayoutParams} class which serves as the base 56 * class for layouts parameters. 57 * </p> 58 * 59 * <p> 60 * Also see {@link LayoutParams} for layout attributes. 61 * </p> 62 * 63 * @attr ref android.R.styleable#ViewGroup_clipChildren 64 * @attr ref android.R.styleable#ViewGroup_clipToPadding 65 * @attr ref android.R.styleable#ViewGroup_layoutAnimation 66 * @attr ref android.R.styleable#ViewGroup_animationCache 67 * @attr ref android.R.styleable#ViewGroup_persistentDrawingCache 68 * @attr ref android.R.styleable#ViewGroup_alwaysDrawnWithCache 69 * @attr ref android.R.styleable#ViewGroup_addStatesFromChildren 70 * @attr ref android.R.styleable#ViewGroup_descendantFocusability 71 * @attr ref android.R.styleable#ViewGroup_animateLayoutChanges 72 */ 73public abstract class ViewGroup extends View implements ViewParent, ViewManager { 74 75 private static final boolean DBG = false; 76 77 /** 78 * Views which have been hidden or removed which need to be animated on 79 * their way out. 80 * This field should be made private, so it is hidden from the SDK. 81 * {@hide} 82 */ 83 protected ArrayList<View> mDisappearingChildren; 84 85 /** 86 * Listener used to propagate events indicating when children are added 87 * and/or removed from a view group. 88 * This field should be made private, so it is hidden from the SDK. 89 * {@hide} 90 */ 91 protected OnHierarchyChangeListener mOnHierarchyChangeListener; 92 93 // The view contained within this ViewGroup that has or contains focus. 94 private View mFocused; 95 96 /** 97 * A Transformation used when drawing children, to 98 * apply on the child being drawn. 99 */ 100 private final Transformation mChildTransformation = new Transformation(); 101 102 /** 103 * Used to track the current invalidation region. 104 */ 105 private RectF mInvalidateRegion; 106 107 /** 108 * A Transformation used to calculate a correct 109 * invalidation area when the application is autoscaled. 110 */ 111 private Transformation mInvalidationTransformation; 112 113 // View currently under an ongoing drag 114 private View mCurrentDragView; 115 116 // Metadata about the ongoing drag 117 private DragEvent mCurrentDrag; 118 private HashSet<View> mDragNotifiedChildren; 119 120 // Does this group have a child that can accept the current drag payload? 121 private boolean mChildAcceptsDrag; 122 123 // Used during drag dispatch 124 private final PointF mLocalPoint = new PointF(); 125 126 // Layout animation 127 private LayoutAnimationController mLayoutAnimationController; 128 private Animation.AnimationListener mAnimationListener; 129 130 // First touch target in the linked list of touch targets. 131 private TouchTarget mFirstTouchTarget; 132 133 // Temporary arrays for splitting pointers. 134 private int[] mTmpPointerIndexMap; 135 private int[] mTmpPointerIds; 136 private MotionEvent.PointerCoords[] mTmpPointerCoords; 137 138 // For debugging only. You can see these in hierarchyviewer. 139 @SuppressWarnings({"FieldCanBeLocal", "UnusedDeclaration"}) 140 @ViewDebug.ExportedProperty(category = "events") 141 private long mLastTouchDownTime; 142 @ViewDebug.ExportedProperty(category = "events") 143 private int mLastTouchDownIndex = -1; 144 @SuppressWarnings({"FieldCanBeLocal", "UnusedDeclaration"}) 145 @ViewDebug.ExportedProperty(category = "events") 146 private float mLastTouchDownX; 147 @SuppressWarnings({"FieldCanBeLocal", "UnusedDeclaration"}) 148 @ViewDebug.ExportedProperty(category = "events") 149 private float mLastTouchDownY; 150 151 /** 152 * Internal flags. 153 * 154 * This field should be made private, so it is hidden from the SDK. 155 * {@hide} 156 */ 157 protected int mGroupFlags; 158 159 // When set, ViewGroup invalidates only the child's rectangle 160 // Set by default 161 private static final int FLAG_CLIP_CHILDREN = 0x1; 162 163 // When set, ViewGroup excludes the padding area from the invalidate rectangle 164 // Set by default 165 private static final int FLAG_CLIP_TO_PADDING = 0x2; 166 167 // When set, dispatchDraw() will invoke invalidate(); this is set by drawChild() when 168 // a child needs to be invalidated and FLAG_OPTIMIZE_INVALIDATE is set 169 private static final int FLAG_INVALIDATE_REQUIRED = 0x4; 170 171 // When set, dispatchDraw() will run the layout animation and unset the flag 172 private static final int FLAG_RUN_ANIMATION = 0x8; 173 174 // When set, there is either no layout animation on the ViewGroup or the layout 175 // animation is over 176 // Set by default 177 private static final int FLAG_ANIMATION_DONE = 0x10; 178 179 // If set, this ViewGroup has padding; if unset there is no padding and we don't need 180 // to clip it, even if FLAG_CLIP_TO_PADDING is set 181 private static final int FLAG_PADDING_NOT_NULL = 0x20; 182 183 // When set, this ViewGroup caches its children in a Bitmap before starting a layout animation 184 // Set by default 185 private static final int FLAG_ANIMATION_CACHE = 0x40; 186 187 // When set, this ViewGroup converts calls to invalidate(Rect) to invalidate() during a 188 // layout animation; this avoid clobbering the hierarchy 189 // Automatically set when the layout animation starts, depending on the animation's 190 // characteristics 191 private static final int FLAG_OPTIMIZE_INVALIDATE = 0x80; 192 193 // When set, the next call to drawChild() will clear mChildTransformation's matrix 194 private static final int FLAG_CLEAR_TRANSFORMATION = 0x100; 195 196 // When set, this ViewGroup invokes mAnimationListener.onAnimationEnd() and removes 197 // the children's Bitmap caches if necessary 198 // This flag is set when the layout animation is over (after FLAG_ANIMATION_DONE is set) 199 private static final int FLAG_NOTIFY_ANIMATION_LISTENER = 0x200; 200 201 /** 202 * When set, the drawing method will call {@link #getChildDrawingOrder(int, int)} 203 * to get the index of the child to draw for that iteration. 204 * 205 * @hide 206 */ 207 protected static final int FLAG_USE_CHILD_DRAWING_ORDER = 0x400; 208 209 /** 210 * When set, this ViewGroup supports static transformations on children; this causes 211 * {@link #getChildStaticTransformation(View, android.view.animation.Transformation)} to be 212 * invoked when a child is drawn. 213 * 214 * Any subclass overriding 215 * {@link #getChildStaticTransformation(View, android.view.animation.Transformation)} should 216 * set this flags in {@link #mGroupFlags}. 217 * 218 * {@hide} 219 */ 220 protected static final int FLAG_SUPPORT_STATIC_TRANSFORMATIONS = 0x800; 221 222 // When the previous drawChild() invocation used an alpha value that was lower than 223 // 1.0 and set it in mCachePaint 224 private static final int FLAG_ALPHA_LOWER_THAN_ONE = 0x1000; 225 226 /** 227 * When set, this ViewGroup's drawable states also include those 228 * of its children. 229 */ 230 private static final int FLAG_ADD_STATES_FROM_CHILDREN = 0x2000; 231 232 /** 233 * When set, this ViewGroup tries to always draw its children using their drawing cache. 234 */ 235 private static final int FLAG_ALWAYS_DRAWN_WITH_CACHE = 0x4000; 236 237 /** 238 * When set, and if FLAG_ALWAYS_DRAWN_WITH_CACHE is not set, this ViewGroup will try to 239 * draw its children with their drawing cache. 240 */ 241 private static final int FLAG_CHILDREN_DRAWN_WITH_CACHE = 0x8000; 242 243 /** 244 * When set, this group will go through its list of children to notify them of 245 * any drawable state change. 246 */ 247 private static final int FLAG_NOTIFY_CHILDREN_ON_DRAWABLE_STATE_CHANGE = 0x10000; 248 249 private static final int FLAG_MASK_FOCUSABILITY = 0x60000; 250 251 /** 252 * This view will get focus before any of its descendants. 253 */ 254 public static final int FOCUS_BEFORE_DESCENDANTS = 0x20000; 255 256 /** 257 * This view will get focus only if none of its descendants want it. 258 */ 259 public static final int FOCUS_AFTER_DESCENDANTS = 0x40000; 260 261 /** 262 * This view will block any of its descendants from getting focus, even 263 * if they are focusable. 264 */ 265 public static final int FOCUS_BLOCK_DESCENDANTS = 0x60000; 266 267 /** 268 * Used to map between enum in attrubutes and flag values. 269 */ 270 private static final int[] DESCENDANT_FOCUSABILITY_FLAGS = 271 {FOCUS_BEFORE_DESCENDANTS, FOCUS_AFTER_DESCENDANTS, 272 FOCUS_BLOCK_DESCENDANTS}; 273 274 /** 275 * When set, this ViewGroup should not intercept touch events. 276 * {@hide} 277 */ 278 protected static final int FLAG_DISALLOW_INTERCEPT = 0x80000; 279 280 /** 281 * When set, this ViewGroup will split MotionEvents to multiple child Views when appropriate. 282 */ 283 private static final int FLAG_SPLIT_MOTION_EVENTS = 0x200000; 284 285 /** 286 * Indicates which types of drawing caches are to be kept in memory. 287 * This field should be made private, so it is hidden from the SDK. 288 * {@hide} 289 */ 290 protected int mPersistentDrawingCache; 291 292 /** 293 * Used to indicate that no drawing cache should be kept in memory. 294 */ 295 public static final int PERSISTENT_NO_CACHE = 0x0; 296 297 /** 298 * Used to indicate that the animation drawing cache should be kept in memory. 299 */ 300 public static final int PERSISTENT_ANIMATION_CACHE = 0x1; 301 302 /** 303 * Used to indicate that the scrolling drawing cache should be kept in memory. 304 */ 305 public static final int PERSISTENT_SCROLLING_CACHE = 0x2; 306 307 /** 308 * Used to indicate that all drawing caches should be kept in memory. 309 */ 310 public static final int PERSISTENT_ALL_CACHES = 0x3; 311 312 /** 313 * We clip to padding when FLAG_CLIP_TO_PADDING and FLAG_PADDING_NOT_NULL 314 * are set at the same time. 315 */ 316 protected static final int CLIP_TO_PADDING_MASK = FLAG_CLIP_TO_PADDING | FLAG_PADDING_NOT_NULL; 317 318 // Index of the child's left position in the mLocation array 319 private static final int CHILD_LEFT_INDEX = 0; 320 // Index of the child's top position in the mLocation array 321 private static final int CHILD_TOP_INDEX = 1; 322 323 // Child views of this ViewGroup 324 private View[] mChildren; 325 // Number of valid children in the mChildren array, the rest should be null or not 326 // considered as children 327 328 private boolean mLayoutSuppressed = false; 329 330 private int mChildrenCount; 331 332 private static final int ARRAY_INITIAL_CAPACITY = 12; 333 private static final int ARRAY_CAPACITY_INCREMENT = 12; 334 335 // Used to draw cached views 336 private final Paint mCachePaint = new Paint(); 337 338 // Used to animate add/remove changes in layout 339 private LayoutTransition mTransition; 340 341 // The set of views that are currently being transitioned. This list is used to track views 342 // being removed that should not actually be removed from the parent yet because they are 343 // being animated. 344 private ArrayList<View> mTransitioningViews; 345 346 // List of children changing visibility. This is used to potentially keep rendering 347 // views during a transition when they otherwise would have become gone/invisible 348 private ArrayList<View> mVisibilityChangingChildren; 349 350 public ViewGroup(Context context) { 351 super(context); 352 initViewGroup(); 353 } 354 355 public ViewGroup(Context context, AttributeSet attrs) { 356 super(context, attrs); 357 initViewGroup(); 358 initFromAttributes(context, attrs); 359 } 360 361 public ViewGroup(Context context, AttributeSet attrs, int defStyle) { 362 super(context, attrs, defStyle); 363 initViewGroup(); 364 initFromAttributes(context, attrs); 365 } 366 367 private void initViewGroup() { 368 // ViewGroup doesn't draw by default 369 setFlags(WILL_NOT_DRAW, DRAW_MASK); 370 mGroupFlags |= FLAG_CLIP_CHILDREN; 371 mGroupFlags |= FLAG_CLIP_TO_PADDING; 372 mGroupFlags |= FLAG_ANIMATION_DONE; 373 mGroupFlags |= FLAG_ANIMATION_CACHE; 374 mGroupFlags |= FLAG_ALWAYS_DRAWN_WITH_CACHE; 375 376 if (mContext.getApplicationInfo().targetSdkVersion >= Build.VERSION_CODES.HONEYCOMB) { 377 mGroupFlags |= FLAG_SPLIT_MOTION_EVENTS; 378 } 379 380 setDescendantFocusability(FOCUS_BEFORE_DESCENDANTS); 381 382 mChildren = new View[ARRAY_INITIAL_CAPACITY]; 383 mChildrenCount = 0; 384 385 mCachePaint.setDither(false); 386 387 mPersistentDrawingCache = PERSISTENT_SCROLLING_CACHE; 388 } 389 390 private void initFromAttributes(Context context, AttributeSet attrs) { 391 TypedArray a = context.obtainStyledAttributes(attrs, 392 R.styleable.ViewGroup); 393 394 final int N = a.getIndexCount(); 395 for (int i = 0; i < N; i++) { 396 int attr = a.getIndex(i); 397 switch (attr) { 398 case R.styleable.ViewGroup_clipChildren: 399 setClipChildren(a.getBoolean(attr, true)); 400 break; 401 case R.styleable.ViewGroup_clipToPadding: 402 setClipToPadding(a.getBoolean(attr, true)); 403 break; 404 case R.styleable.ViewGroup_animationCache: 405 setAnimationCacheEnabled(a.getBoolean(attr, true)); 406 break; 407 case R.styleable.ViewGroup_persistentDrawingCache: 408 setPersistentDrawingCache(a.getInt(attr, PERSISTENT_SCROLLING_CACHE)); 409 break; 410 case R.styleable.ViewGroup_addStatesFromChildren: 411 setAddStatesFromChildren(a.getBoolean(attr, false)); 412 break; 413 case R.styleable.ViewGroup_alwaysDrawnWithCache: 414 setAlwaysDrawnWithCacheEnabled(a.getBoolean(attr, true)); 415 break; 416 case R.styleable.ViewGroup_layoutAnimation: 417 int id = a.getResourceId(attr, -1); 418 if (id > 0) { 419 setLayoutAnimation(AnimationUtils.loadLayoutAnimation(mContext, id)); 420 } 421 break; 422 case R.styleable.ViewGroup_descendantFocusability: 423 setDescendantFocusability(DESCENDANT_FOCUSABILITY_FLAGS[a.getInt(attr, 0)]); 424 break; 425 case R.styleable.ViewGroup_splitMotionEvents: 426 setMotionEventSplittingEnabled(a.getBoolean(attr, false)); 427 break; 428 case R.styleable.ViewGroup_animateLayoutChanges: 429 boolean animateLayoutChanges = a.getBoolean(attr, false); 430 if (animateLayoutChanges) { 431 setLayoutTransition(new LayoutTransition()); 432 } 433 break; 434 } 435 } 436 437 a.recycle(); 438 } 439 440 /** 441 * Gets the descendant focusability of this view group. The descendant 442 * focusability defines the relationship between this view group and its 443 * descendants when looking for a view to take focus in 444 * {@link #requestFocus(int, android.graphics.Rect)}. 445 * 446 * @return one of {@link #FOCUS_BEFORE_DESCENDANTS}, {@link #FOCUS_AFTER_DESCENDANTS}, 447 * {@link #FOCUS_BLOCK_DESCENDANTS}. 448 */ 449 @ViewDebug.ExportedProperty(category = "focus", mapping = { 450 @ViewDebug.IntToString(from = FOCUS_BEFORE_DESCENDANTS, to = "FOCUS_BEFORE_DESCENDANTS"), 451 @ViewDebug.IntToString(from = FOCUS_AFTER_DESCENDANTS, to = "FOCUS_AFTER_DESCENDANTS"), 452 @ViewDebug.IntToString(from = FOCUS_BLOCK_DESCENDANTS, to = "FOCUS_BLOCK_DESCENDANTS") 453 }) 454 public int getDescendantFocusability() { 455 return mGroupFlags & FLAG_MASK_FOCUSABILITY; 456 } 457 458 /** 459 * Set the descendant focusability of this view group. This defines the relationship 460 * between this view group and its descendants when looking for a view to 461 * take focus in {@link #requestFocus(int, android.graphics.Rect)}. 462 * 463 * @param focusability one of {@link #FOCUS_BEFORE_DESCENDANTS}, {@link #FOCUS_AFTER_DESCENDANTS}, 464 * {@link #FOCUS_BLOCK_DESCENDANTS}. 465 */ 466 public void setDescendantFocusability(int focusability) { 467 switch (focusability) { 468 case FOCUS_BEFORE_DESCENDANTS: 469 case FOCUS_AFTER_DESCENDANTS: 470 case FOCUS_BLOCK_DESCENDANTS: 471 break; 472 default: 473 throw new IllegalArgumentException("must be one of FOCUS_BEFORE_DESCENDANTS, " 474 + "FOCUS_AFTER_DESCENDANTS, FOCUS_BLOCK_DESCENDANTS"); 475 } 476 mGroupFlags &= ~FLAG_MASK_FOCUSABILITY; 477 mGroupFlags |= (focusability & FLAG_MASK_FOCUSABILITY); 478 } 479 480 /** 481 * {@inheritDoc} 482 */ 483 @Override 484 void handleFocusGainInternal(int direction, Rect previouslyFocusedRect) { 485 if (mFocused != null) { 486 mFocused.unFocus(); 487 mFocused = null; 488 } 489 super.handleFocusGainInternal(direction, previouslyFocusedRect); 490 } 491 492 /** 493 * {@inheritDoc} 494 */ 495 public void requestChildFocus(View child, View focused) { 496 if (DBG) { 497 System.out.println(this + " requestChildFocus()"); 498 } 499 if (getDescendantFocusability() == FOCUS_BLOCK_DESCENDANTS) { 500 return; 501 } 502 503 // Unfocus us, if necessary 504 super.unFocus(); 505 506 // We had a previous notion of who had focus. Clear it. 507 if (mFocused != child) { 508 if (mFocused != null) { 509 mFocused.unFocus(); 510 } 511 512 mFocused = child; 513 } 514 if (mParent != null) { 515 mParent.requestChildFocus(this, focused); 516 } 517 } 518 519 /** 520 * {@inheritDoc} 521 */ 522 public void focusableViewAvailable(View v) { 523 if (mParent != null 524 // shortcut: don't report a new focusable view if we block our descendants from 525 // getting focus 526 && (getDescendantFocusability() != FOCUS_BLOCK_DESCENDANTS) 527 // shortcut: don't report a new focusable view if we already are focused 528 // (and we don't prefer our descendants) 529 // 530 // note: knowing that mFocused is non-null is not a good enough reason 531 // to break the traversal since in that case we'd actually have to find 532 // the focused view and make sure it wasn't FOCUS_AFTER_DESCENDANTS and 533 // an ancestor of v; this will get checked for at ViewRoot 534 && !(isFocused() && getDescendantFocusability() != FOCUS_AFTER_DESCENDANTS)) { 535 mParent.focusableViewAvailable(v); 536 } 537 } 538 539 /** 540 * {@inheritDoc} 541 */ 542 public boolean showContextMenuForChild(View originalView) { 543 return mParent != null && mParent.showContextMenuForChild(originalView); 544 } 545 546 /** 547 * {@inheritDoc} 548 */ 549 public ActionMode startActionModeForChild(View originalView, ActionMode.Callback callback) { 550 return mParent != null ? mParent.startActionModeForChild(originalView, callback) : null; 551 } 552 553 /** 554 * Find the nearest view in the specified direction that wants to take 555 * focus. 556 * 557 * @param focused The view that currently has focus 558 * @param direction One of FOCUS_UP, FOCUS_DOWN, FOCUS_LEFT, and 559 * FOCUS_RIGHT, or 0 for not applicable. 560 */ 561 public View focusSearch(View focused, int direction) { 562 if (isRootNamespace()) { 563 // root namespace means we should consider ourselves the top of the 564 // tree for focus searching; otherwise we could be focus searching 565 // into other tabs. see LocalActivityManager and TabHost for more info 566 return FocusFinder.getInstance().findNextFocus(this, focused, direction); 567 } else if (mParent != null) { 568 return mParent.focusSearch(focused, direction); 569 } 570 return null; 571 } 572 573 /** 574 * {@inheritDoc} 575 */ 576 public boolean requestChildRectangleOnScreen(View child, Rect rectangle, boolean immediate) { 577 return false; 578 } 579 580 /** 581 * {@inheritDoc} 582 */ 583 @Override 584 public boolean dispatchUnhandledMove(View focused, int direction) { 585 return mFocused != null && 586 mFocused.dispatchUnhandledMove(focused, direction); 587 } 588 589 /** 590 * {@inheritDoc} 591 */ 592 public void clearChildFocus(View child) { 593 if (DBG) { 594 System.out.println(this + " clearChildFocus()"); 595 } 596 597 mFocused = null; 598 if (mParent != null) { 599 mParent.clearChildFocus(this); 600 } 601 } 602 603 /** 604 * {@inheritDoc} 605 */ 606 @Override 607 public void clearFocus() { 608 super.clearFocus(); 609 610 // clear any child focus if it exists 611 if (mFocused != null) { 612 mFocused.clearFocus(); 613 } 614 } 615 616 /** 617 * {@inheritDoc} 618 */ 619 @Override 620 void unFocus() { 621 if (DBG) { 622 System.out.println(this + " unFocus()"); 623 } 624 625 super.unFocus(); 626 if (mFocused != null) { 627 mFocused.unFocus(); 628 } 629 mFocused = null; 630 } 631 632 /** 633 * Returns the focused child of this view, if any. The child may have focus 634 * or contain focus. 635 * 636 * @return the focused child or null. 637 */ 638 public View getFocusedChild() { 639 return mFocused; 640 } 641 642 /** 643 * Returns true if this view has or contains focus 644 * 645 * @return true if this view has or contains focus 646 */ 647 @Override 648 public boolean hasFocus() { 649 return (mPrivateFlags & FOCUSED) != 0 || mFocused != null; 650 } 651 652 /* 653 * (non-Javadoc) 654 * 655 * @see android.view.View#findFocus() 656 */ 657 @Override 658 public View findFocus() { 659 if (DBG) { 660 System.out.println("Find focus in " + this + ": flags=" 661 + isFocused() + ", child=" + mFocused); 662 } 663 664 if (isFocused()) { 665 return this; 666 } 667 668 if (mFocused != null) { 669 return mFocused.findFocus(); 670 } 671 return null; 672 } 673 674 /** 675 * {@inheritDoc} 676 */ 677 @Override 678 public boolean hasFocusable() { 679 if ((mViewFlags & VISIBILITY_MASK) != VISIBLE) { 680 return false; 681 } 682 683 if (isFocusable()) { 684 return true; 685 } 686 687 final int descendantFocusability = getDescendantFocusability(); 688 if (descendantFocusability != FOCUS_BLOCK_DESCENDANTS) { 689 final int count = mChildrenCount; 690 final View[] children = mChildren; 691 692 for (int i = 0; i < count; i++) { 693 final View child = children[i]; 694 if (child.hasFocusable()) { 695 return true; 696 } 697 } 698 } 699 700 return false; 701 } 702 703 /** 704 * {@inheritDoc} 705 */ 706 @Override 707 public void addFocusables(ArrayList<View> views, int direction) { 708 addFocusables(views, direction, FOCUSABLES_TOUCH_MODE); 709 } 710 711 /** 712 * {@inheritDoc} 713 */ 714 @Override 715 public void addFocusables(ArrayList<View> views, int direction, int focusableMode) { 716 final int focusableCount = views.size(); 717 718 final int descendantFocusability = getDescendantFocusability(); 719 720 if (descendantFocusability != FOCUS_BLOCK_DESCENDANTS) { 721 final int count = mChildrenCount; 722 final View[] children = mChildren; 723 724 for (int i = 0; i < count; i++) { 725 final View child = children[i]; 726 if ((child.mViewFlags & VISIBILITY_MASK) == VISIBLE) { 727 child.addFocusables(views, direction, focusableMode); 728 } 729 } 730 } 731 732 // we add ourselves (if focusable) in all cases except for when we are 733 // FOCUS_AFTER_DESCENDANTS and there are some descendants focusable. this is 734 // to avoid the focus search finding layouts when a more precise search 735 // among the focusable children would be more interesting. 736 if ( 737 descendantFocusability != FOCUS_AFTER_DESCENDANTS || 738 // No focusable descendants 739 (focusableCount == views.size())) { 740 super.addFocusables(views, direction, focusableMode); 741 } 742 } 743 744 /** 745 * {@inheritDoc} 746 */ 747 @Override 748 public void dispatchWindowFocusChanged(boolean hasFocus) { 749 super.dispatchWindowFocusChanged(hasFocus); 750 final int count = mChildrenCount; 751 final View[] children = mChildren; 752 for (int i = 0; i < count; i++) { 753 children[i].dispatchWindowFocusChanged(hasFocus); 754 } 755 } 756 757 /** 758 * {@inheritDoc} 759 */ 760 @Override 761 public void addTouchables(ArrayList<View> views) { 762 super.addTouchables(views); 763 764 final int count = mChildrenCount; 765 final View[] children = mChildren; 766 767 for (int i = 0; i < count; i++) { 768 final View child = children[i]; 769 if ((child.mViewFlags & VISIBILITY_MASK) == VISIBLE) { 770 child.addTouchables(views); 771 } 772 } 773 } 774 775 /** 776 * {@inheritDoc} 777 */ 778 @Override 779 public void dispatchDisplayHint(int hint) { 780 super.dispatchDisplayHint(hint); 781 final int count = mChildrenCount; 782 final View[] children = mChildren; 783 for (int i = 0; i < count; i++) { 784 children[i].dispatchDisplayHint(hint); 785 } 786 } 787 788 /** 789 * @hide 790 * @param child 791 * @param visibility 792 */ 793 void onChildVisibilityChanged(View child, int visibility) { 794 if (mTransition != null) { 795 if (visibility == VISIBLE) { 796 mTransition.showChild(this, child); 797 } else { 798 mTransition.hideChild(this, child); 799 } 800 if (visibility != VISIBLE) { 801 // Only track this on disappearing views - appearing views are already visible 802 // and don't need special handling during drawChild() 803 if (mVisibilityChangingChildren == null) { 804 mVisibilityChangingChildren = new ArrayList<View>(); 805 } 806 mVisibilityChangingChildren.add(child); 807 if (mTransitioningViews != null && mTransitioningViews.contains(child)) { 808 addDisappearingView(child); 809 } 810 } 811 } 812 813 // in all cases, for drags 814 if (mCurrentDrag != null) { 815 if (visibility == VISIBLE) { 816 notifyChildOfDrag(child); 817 } 818 } 819 } 820 821 /** 822 * {@inheritDoc} 823 */ 824 @Override 825 protected void dispatchVisibilityChanged(View changedView, int visibility) { 826 super.dispatchVisibilityChanged(changedView, visibility); 827 final int count = mChildrenCount; 828 final View[] children = mChildren; 829 for (int i = 0; i < count; i++) { 830 children[i].dispatchVisibilityChanged(changedView, visibility); 831 } 832 } 833 834 /** 835 * {@inheritDoc} 836 */ 837 @Override 838 public void dispatchWindowVisibilityChanged(int visibility) { 839 super.dispatchWindowVisibilityChanged(visibility); 840 final int count = mChildrenCount; 841 final View[] children = mChildren; 842 for (int i = 0; i < count; i++) { 843 children[i].dispatchWindowVisibilityChanged(visibility); 844 } 845 } 846 847 /** 848 * {@inheritDoc} 849 */ 850 @Override 851 public void dispatchConfigurationChanged(Configuration newConfig) { 852 super.dispatchConfigurationChanged(newConfig); 853 final int count = mChildrenCount; 854 final View[] children = mChildren; 855 for (int i = 0; i < count; i++) { 856 children[i].dispatchConfigurationChanged(newConfig); 857 } 858 } 859 860 /** 861 * {@inheritDoc} 862 */ 863 public void recomputeViewAttributes(View child) { 864 if (mAttachInfo != null && !mAttachInfo.mRecomputeGlobalAttributes) { 865 ViewParent parent = mParent; 866 if (parent != null) parent.recomputeViewAttributes(this); 867 } 868 } 869 870 @Override 871 void dispatchCollectViewAttributes(int visibility) { 872 visibility |= mViewFlags&VISIBILITY_MASK; 873 super.dispatchCollectViewAttributes(visibility); 874 final int count = mChildrenCount; 875 final View[] children = mChildren; 876 for (int i = 0; i < count; i++) { 877 children[i].dispatchCollectViewAttributes(visibility); 878 } 879 } 880 881 /** 882 * {@inheritDoc} 883 */ 884 public void bringChildToFront(View child) { 885 int index = indexOfChild(child); 886 if (index >= 0) { 887 removeFromArray(index); 888 addInArray(child, mChildrenCount); 889 child.mParent = this; 890 } 891 } 892 893 /** 894 * {@inheritDoc} 895 * 896 * !!! TODO: write real docs 897 */ 898 @Override 899 public boolean dispatchDragEvent(DragEvent event) { 900 boolean retval = false; 901 final float tx = event.mX; 902 final float ty = event.mY; 903 904 ViewRoot root = getViewRoot(); 905 906 // Dispatch down the view hierarchy 907 switch (event.mAction) { 908 case DragEvent.ACTION_DRAG_STARTED: { 909 // clear state to recalculate which views we drag over 910 mCurrentDragView = null; 911 912 // Set up our tracking of drag-started notifications 913 mCurrentDrag = DragEvent.obtain(event); 914 if (mDragNotifiedChildren == null) { 915 mDragNotifiedChildren = new HashSet<View>(); 916 } else { 917 mDragNotifiedChildren.clear(); 918 } 919 920 // Now dispatch down to our children, caching the responses 921 mChildAcceptsDrag = false; 922 final int count = mChildrenCount; 923 final View[] children = mChildren; 924 for (int i = 0; i < count; i++) { 925 final View child = children[i]; 926 if (child.getVisibility() == VISIBLE) { 927 final boolean handled = notifyChildOfDrag(children[i]); 928 if (handled) { 929 mChildAcceptsDrag = true; 930 } 931 } 932 } 933 934 // Return HANDLED if one of our children can accept the drag 935 if (mChildAcceptsDrag) { 936 retval = true; 937 } 938 } break; 939 940 case DragEvent.ACTION_DRAG_ENDED: { 941 // Release the bookkeeping now that the drag lifecycle has ended 942 if (mDragNotifiedChildren != null) { 943 for (View child : mDragNotifiedChildren) { 944 // If a child was notified about an ongoing drag, it's told that it's over 945 child.dispatchDragEvent(event); 946 } 947 948 mDragNotifiedChildren.clear(); 949 mCurrentDrag.recycle(); 950 mCurrentDrag = null; 951 } 952 953 // We consider drag-ended to have been handled if one of our children 954 // had offered to handle the drag. 955 if (mChildAcceptsDrag) { 956 retval = true; 957 } 958 } break; 959 960 case DragEvent.ACTION_DRAG_LOCATION: { 961 // Find the [possibly new] drag target 962 final View target = findFrontmostDroppableChildAt(event.mX, event.mY, mLocalPoint); 963 964 // If we've changed apparent drag target, tell the view root which view 965 // we're over now [for purposes of the eventual drag-recipient-changed 966 // notifications to the framework] and tell the new target that the drag 967 // has entered its bounds. The root will see setDragFocus() calls all 968 // the way down to the final leaf view that is handling the LOCATION event 969 // before reporting the new potential recipient to the framework. 970 if (mCurrentDragView != target) { 971 root.setDragFocus(target); 972 973 final int action = event.mAction; 974 // If we've dragged off of a child view, send it the EXITED message 975 if (mCurrentDragView != null) { 976 event.mAction = DragEvent.ACTION_DRAG_EXITED; 977 mCurrentDragView.dispatchDragEvent(event); 978 } 979 mCurrentDragView = target; 980 981 // If we've dragged over a new child view, send it the ENTERED message 982 if (target != null) { 983 event.mAction = DragEvent.ACTION_DRAG_ENTERED; 984 target.dispatchDragEvent(event); 985 } 986 event.mAction = action; // restore the event's original state 987 } 988 989 // Dispatch the actual drag location notice, localized into its coordinates 990 if (target != null) { 991 event.mX = mLocalPoint.x; 992 event.mY = mLocalPoint.y; 993 994 retval = target.dispatchDragEvent(event); 995 996 event.mX = tx; 997 event.mY = ty; 998 } 999 } break; 1000 1001 /* Entered / exited dispatch 1002 * 1003 * DRAG_ENTERED is not dispatched downwards from ViewGroup. The reason for this is 1004 * that we're about to get the corresponding LOCATION event, which we will use to 1005 * determine which of our children is the new target; at that point we will 1006 * push a DRAG_ENTERED down to the new target child [which may itself be a ViewGroup]. 1007 * 1008 * DRAG_EXITED *is* dispatched all the way down immediately: once we know the 1009 * drag has left this ViewGroup, we know by definition that every contained subview 1010 * is also no longer under the drag point. 1011 */ 1012 1013 case DragEvent.ACTION_DRAG_EXITED: { 1014 if (mCurrentDragView != null) { 1015 mCurrentDragView.dispatchDragEvent(event); 1016 mCurrentDragView = null; 1017 } 1018 } break; 1019 1020 case DragEvent.ACTION_DROP: { 1021 if (ViewDebug.DEBUG_DRAG) Log.d(View.VIEW_LOG_TAG, "Drop event: " + event); 1022 View target = findFrontmostDroppableChildAt(event.mX, event.mY, mLocalPoint); 1023 if (target != null) { 1024 if (ViewDebug.DEBUG_DRAG) Log.d(View.VIEW_LOG_TAG, " dispatch drop to " + target); 1025 event.mX = mLocalPoint.x; 1026 event.mY = mLocalPoint.y; 1027 retval = target.dispatchDragEvent(event); 1028 event.mX = tx; 1029 event.mY = ty; 1030 } else { 1031 if (ViewDebug.DEBUG_DRAG) { 1032 Log.d(View.VIEW_LOG_TAG, " not dropped on an accepting view"); 1033 } 1034 } 1035 } break; 1036 } 1037 1038 // If none of our children could handle the event, try here 1039 if (!retval) { 1040 // Call up to the View implementation that dispatches to installed listeners 1041 retval = super.dispatchDragEvent(event); 1042 } 1043 return retval; 1044 } 1045 1046 // Find the frontmost child view that lies under the given point, and calculate 1047 // the position within its own local coordinate system. 1048 View findFrontmostDroppableChildAt(float x, float y, PointF outLocalPoint) { 1049 final int count = mChildrenCount; 1050 final View[] children = mChildren; 1051 for (int i = count - 1; i >= 0; i--) { 1052 final View child = children[i]; 1053 if (!child.mCanAcceptDrop) { 1054 continue; 1055 } 1056 1057 if (isTransformedTouchPointInView(x, y, child, outLocalPoint)) { 1058 return child; 1059 } 1060 } 1061 return null; 1062 } 1063 1064 boolean notifyChildOfDrag(View child) { 1065 if (ViewDebug.DEBUG_DRAG) { 1066 Log.d(View.VIEW_LOG_TAG, "Sending drag-started to view: " + child); 1067 } 1068 1069 if (! mDragNotifiedChildren.contains(child)) { 1070 mDragNotifiedChildren.add(child); 1071 child.mCanAcceptDrop = child.dispatchDragEvent(mCurrentDrag); 1072 } 1073 return child.mCanAcceptDrop; 1074 } 1075 1076 @Override 1077 public void dispatchSystemUiVisibilityChanged(int visible) { 1078 super.dispatchSystemUiVisibilityChanged(visible); 1079 1080 final int count = mChildrenCount; 1081 final View[] children = mChildren; 1082 for (int i=0; i <count; i++) { 1083 final View child = children[i]; 1084 child.dispatchSystemUiVisibilityChanged(visible); 1085 } 1086 } 1087 1088 /** 1089 * {@inheritDoc} 1090 */ 1091 @Override 1092 public boolean dispatchKeyEventPreIme(KeyEvent event) { 1093 if ((mPrivateFlags & (FOCUSED | HAS_BOUNDS)) == (FOCUSED | HAS_BOUNDS)) { 1094 return super.dispatchKeyEventPreIme(event); 1095 } else if (mFocused != null && (mFocused.mPrivateFlags & HAS_BOUNDS) == HAS_BOUNDS) { 1096 return mFocused.dispatchKeyEventPreIme(event); 1097 } 1098 return false; 1099 } 1100 1101 /** 1102 * {@inheritDoc} 1103 */ 1104 @Override 1105 public boolean dispatchKeyEvent(KeyEvent event) { 1106 if ((mPrivateFlags & (FOCUSED | HAS_BOUNDS)) == (FOCUSED | HAS_BOUNDS)) { 1107 return super.dispatchKeyEvent(event); 1108 } else if (mFocused != null && (mFocused.mPrivateFlags & HAS_BOUNDS) == HAS_BOUNDS) { 1109 return mFocused.dispatchKeyEvent(event); 1110 } 1111 return false; 1112 } 1113 1114 /** 1115 * {@inheritDoc} 1116 */ 1117 @Override 1118 public boolean dispatchKeyShortcutEvent(KeyEvent event) { 1119 if ((mPrivateFlags & (FOCUSED | HAS_BOUNDS)) == (FOCUSED | HAS_BOUNDS)) { 1120 return super.dispatchKeyShortcutEvent(event); 1121 } else if (mFocused != null && (mFocused.mPrivateFlags & HAS_BOUNDS) == HAS_BOUNDS) { 1122 return mFocused.dispatchKeyShortcutEvent(event); 1123 } 1124 return false; 1125 } 1126 1127 /** 1128 * {@inheritDoc} 1129 */ 1130 @Override 1131 public boolean dispatchTrackballEvent(MotionEvent event) { 1132 if ((mPrivateFlags & (FOCUSED | HAS_BOUNDS)) == (FOCUSED | HAS_BOUNDS)) { 1133 return super.dispatchTrackballEvent(event); 1134 } else if (mFocused != null && (mFocused.mPrivateFlags & HAS_BOUNDS) == HAS_BOUNDS) { 1135 return mFocused.dispatchTrackballEvent(event); 1136 } 1137 return false; 1138 } 1139 1140 /** 1141 * {@inheritDoc} 1142 */ 1143 @Override 1144 public boolean dispatchTouchEvent(MotionEvent ev) { 1145 if (!onFilterTouchEventForSecurity(ev)) { 1146 return false; 1147 } 1148 1149 final int action = ev.getAction(); 1150 final int actionMasked = action & MotionEvent.ACTION_MASK; 1151 1152 // Handle an initial down. 1153 if (actionMasked == MotionEvent.ACTION_DOWN) { 1154 // Throw away all previous state when starting a new touch gesture. 1155 // The framework may have dropped the up or cancel event for the previous gesture 1156 // due to an app switch, ANR, or some other state change. 1157 cancelAndClearTouchTargets(ev); 1158 resetTouchState(); 1159 } 1160 1161 // Check for interception. 1162 final boolean intercepted; 1163 if (actionMasked == MotionEvent.ACTION_DOWN || mFirstTouchTarget != null) { 1164 final boolean disallowIntercept = (mGroupFlags & FLAG_DISALLOW_INTERCEPT) != 0; 1165 if (!disallowIntercept) { 1166 intercepted = onInterceptTouchEvent(ev); 1167 ev.setAction(action); // restore action in case onInterceptTouchEvent() changed it 1168 } else { 1169 intercepted = false; 1170 } 1171 } else { 1172 intercepted = true; 1173 } 1174 1175 // Check for cancelation. 1176 final boolean canceled = resetCancelNextUpFlag(this) 1177 || actionMasked == MotionEvent.ACTION_CANCEL; 1178 1179 // Update list of touch targets for pointer down, if needed. 1180 final boolean split = (mGroupFlags & FLAG_SPLIT_MOTION_EVENTS) != 0; 1181 TouchTarget newTouchTarget = null; 1182 boolean alreadyDispatchedToNewTouchTarget = false; 1183 if (!canceled && !intercepted) { 1184 if (actionMasked == MotionEvent.ACTION_DOWN 1185 || (split && actionMasked == MotionEvent.ACTION_POINTER_DOWN)) { 1186 final int actionIndex = ev.getActionIndex(); // always 0 for down 1187 final int idBitsToAssign = split ? 1 << ev.getPointerId(actionIndex) 1188 : TouchTarget.ALL_POINTER_IDS; 1189 1190 // Clean up earlier touch targets for this pointer id in case they 1191 // have become out of sync. 1192 removePointersFromTouchTargets(idBitsToAssign); 1193 1194 final int childrenCount = mChildrenCount; 1195 if (childrenCount != 0) { 1196 // Find a child that can receive the event. Scan children from front to back. 1197 final View[] children = mChildren; 1198 final float x = ev.getX(actionIndex); 1199 final float y = ev.getY(actionIndex); 1200 1201 for (int i = childrenCount - 1; i >= 0; i--) { 1202 final View child = children[i]; 1203 if ((child.mViewFlags & VISIBILITY_MASK) != VISIBLE 1204 && child.getAnimation() == null) { 1205 // Skip invisible child unless it is animating. 1206 continue; 1207 } 1208 1209 if (!isTransformedTouchPointInView(x, y, child, null)) { 1210 // New pointer is out of child's bounds. 1211 continue; 1212 } 1213 1214 newTouchTarget = getTouchTarget(child); 1215 if (newTouchTarget != null) { 1216 // Child is already receiving touch within its bounds. 1217 // Give it the new pointer in addition to the ones it is handling. 1218 newTouchTarget.pointerIdBits |= idBitsToAssign; 1219 break; 1220 } 1221 1222 resetCancelNextUpFlag(child); 1223 if (dispatchTransformedTouchEvent(ev, false, child, idBitsToAssign)) { 1224 // Child wants to receive touch within its bounds. 1225 mLastTouchDownTime = ev.getDownTime(); 1226 mLastTouchDownIndex = i; 1227 mLastTouchDownX = ev.getX(); 1228 mLastTouchDownY = ev.getY(); 1229 newTouchTarget = addTouchTarget(child, idBitsToAssign); 1230 alreadyDispatchedToNewTouchTarget = true; 1231 break; 1232 } 1233 } 1234 } 1235 1236 if (newTouchTarget == null && mFirstTouchTarget != null) { 1237 // Did not find a child to receive the event. 1238 // Assign the pointer to the least recently added target. 1239 newTouchTarget = mFirstTouchTarget; 1240 while (newTouchTarget.next != null) { 1241 newTouchTarget = newTouchTarget.next; 1242 } 1243 newTouchTarget.pointerIdBits |= idBitsToAssign; 1244 } 1245 } 1246 } 1247 1248 // Dispatch to touch targets. 1249 boolean handled = false; 1250 if (mFirstTouchTarget == null) { 1251 // No touch targets so treat this as an ordinary view. 1252 handled = dispatchTransformedTouchEvent(ev, canceled, null, 1253 TouchTarget.ALL_POINTER_IDS); 1254 } else { 1255 // Dispatch to touch targets, excluding the new touch target if we already 1256 // dispatched to it. Cancel touch targets if necessary. 1257 TouchTarget predecessor = null; 1258 TouchTarget target = mFirstTouchTarget; 1259 while (target != null) { 1260 final TouchTarget next = target.next; 1261 if (alreadyDispatchedToNewTouchTarget && target == newTouchTarget) { 1262 handled = true; 1263 } else { 1264 final boolean cancelChild = resetCancelNextUpFlag(target.child) || intercepted; 1265 if (dispatchTransformedTouchEvent(ev, cancelChild, 1266 target.child, target.pointerIdBits)) { 1267 handled = true; 1268 } 1269 if (cancelChild) { 1270 if (predecessor == null) { 1271 mFirstTouchTarget = next; 1272 } else { 1273 predecessor.next = next; 1274 } 1275 target.recycle(); 1276 target = next; 1277 continue; 1278 } 1279 } 1280 predecessor = target; 1281 target = next; 1282 } 1283 } 1284 1285 // Update list of touch targets for pointer up or cancel, if needed. 1286 if (canceled || actionMasked == MotionEvent.ACTION_UP) { 1287 resetTouchState(); 1288 } else if (split && actionMasked == MotionEvent.ACTION_POINTER_UP) { 1289 final int actionIndex = ev.getActionIndex(); 1290 final int idBitsToRemove = 1 << ev.getPointerId(actionIndex); 1291 removePointersFromTouchTargets(idBitsToRemove); 1292 } 1293 1294 return handled; 1295 } 1296 1297 /** 1298 * Resets all touch state in preparation for a new cycle. 1299 */ 1300 private void resetTouchState() { 1301 clearTouchTargets(); 1302 resetCancelNextUpFlag(this); 1303 mGroupFlags &= ~FLAG_DISALLOW_INTERCEPT; 1304 } 1305 1306 /** 1307 * Resets the cancel next up flag. 1308 * Returns true if the flag was previously set. 1309 */ 1310 private boolean resetCancelNextUpFlag(View view) { 1311 if ((view.mPrivateFlags & CANCEL_NEXT_UP_EVENT) != 0) { 1312 view.mPrivateFlags &= ~CANCEL_NEXT_UP_EVENT; 1313 return true; 1314 } 1315 return false; 1316 } 1317 1318 /** 1319 * Clears all touch targets. 1320 */ 1321 private void clearTouchTargets() { 1322 TouchTarget target = mFirstTouchTarget; 1323 if (target != null) { 1324 do { 1325 TouchTarget next = target.next; 1326 target.recycle(); 1327 target = next; 1328 } while (target != null); 1329 mFirstTouchTarget = null; 1330 } 1331 } 1332 1333 /** 1334 * Cancels and clears all touch targets. 1335 */ 1336 private void cancelAndClearTouchTargets(MotionEvent event) { 1337 if (mFirstTouchTarget != null) { 1338 boolean syntheticEvent = false; 1339 if (event == null) { 1340 final long now = SystemClock.uptimeMillis(); 1341 event = MotionEvent.obtain(now, now, 1342 MotionEvent.ACTION_CANCEL, 0.0f, 0.0f, 0); 1343 syntheticEvent = true; 1344 } 1345 1346 for (TouchTarget target = mFirstTouchTarget; target != null; target = target.next) { 1347 resetCancelNextUpFlag(target.child); 1348 dispatchTransformedTouchEvent(event, true, target.child, target.pointerIdBits); 1349 } 1350 clearTouchTargets(); 1351 1352 if (syntheticEvent) { 1353 event.recycle(); 1354 } 1355 } 1356 } 1357 1358 /** 1359 * Gets the touch target for specified child view. 1360 * Returns null if not found. 1361 */ 1362 private TouchTarget getTouchTarget(View child) { 1363 for (TouchTarget target = mFirstTouchTarget; target != null; target = target.next) { 1364 if (target.child == child) { 1365 return target; 1366 } 1367 } 1368 return null; 1369 } 1370 1371 /** 1372 * Adds a touch target for specified child to the beginning of the list. 1373 * Assumes the target child is not already present. 1374 */ 1375 private TouchTarget addTouchTarget(View child, int pointerIdBits) { 1376 TouchTarget target = TouchTarget.obtain(child, pointerIdBits); 1377 target.next = mFirstTouchTarget; 1378 mFirstTouchTarget = target; 1379 return target; 1380 } 1381 1382 /** 1383 * Removes the pointer ids from consideration. 1384 */ 1385 private void removePointersFromTouchTargets(int pointerIdBits) { 1386 TouchTarget predecessor = null; 1387 TouchTarget target = mFirstTouchTarget; 1388 while (target != null) { 1389 final TouchTarget next = target.next; 1390 if ((target.pointerIdBits & pointerIdBits) != 0) { 1391 target.pointerIdBits &= ~pointerIdBits; 1392 if (target.pointerIdBits == 0) { 1393 if (predecessor == null) { 1394 mFirstTouchTarget = next; 1395 } else { 1396 predecessor.next = next; 1397 } 1398 target.recycle(); 1399 target = next; 1400 continue; 1401 } 1402 } 1403 predecessor = target; 1404 target = next; 1405 } 1406 } 1407 1408 /** 1409 * Returns true if a child view contains the specified point when transformed 1410 * into its coordinate space. 1411 * Child must not be null. 1412 * @hide 1413 */ 1414 protected boolean isTransformedTouchPointInView(float x, float y, View child, 1415 PointF outLocalPoint) { 1416 float localX = x + mScrollX - child.mLeft; 1417 float localY = y + mScrollY - child.mTop; 1418 if (! child.hasIdentityMatrix() && mAttachInfo != null) { 1419 final float[] localXY = mAttachInfo.mTmpTransformLocation; 1420 localXY[0] = localX; 1421 localXY[1] = localY; 1422 child.getInverseMatrix().mapPoints(localXY); 1423 localX = localXY[0]; 1424 localY = localXY[1]; 1425 } 1426 final boolean isInView = child.pointInView(localX, localY); 1427 if (isInView && outLocalPoint != null) { 1428 outLocalPoint.set(localX, localY); 1429 } 1430 return isInView; 1431 } 1432 1433 /** 1434 * Transforms a motion event into the coordinate space of a particular child view, 1435 * filters out irrelevant pointer ids, and overrides its action if necessary. 1436 * If child is null, assumes the MotionEvent will be sent to this ViewGroup instead. 1437 */ 1438 private boolean dispatchTransformedTouchEvent(MotionEvent event, boolean cancel, 1439 View child, int desiredPointerIdBits) { 1440 final boolean handled; 1441 1442 // Canceling motions is a special case. We don't need to perform any transformations 1443 // or filtering. The important part is the action, not the contents. 1444 final int oldAction = event.getAction(); 1445 if (cancel || oldAction == MotionEvent.ACTION_CANCEL) { 1446 event.setAction(MotionEvent.ACTION_CANCEL); 1447 if (child == null) { 1448 handled = super.dispatchTouchEvent(event); 1449 } else { 1450 handled = child.dispatchTouchEvent(event); 1451 } 1452 event.setAction(oldAction); 1453 return handled; 1454 } 1455 1456 // Calculate the number of pointers to deliver. 1457 final int oldPointerCount = event.getPointerCount(); 1458 int newPointerCount = 0; 1459 if (desiredPointerIdBits == TouchTarget.ALL_POINTER_IDS) { 1460 newPointerCount = oldPointerCount; 1461 } else { 1462 for (int i = 0; i < oldPointerCount; i++) { 1463 final int pointerId = event.getPointerId(i); 1464 final int pointerIdBit = 1 << pointerId; 1465 if ((pointerIdBit & desiredPointerIdBits) != 0) { 1466 newPointerCount += 1; 1467 } 1468 } 1469 } 1470 1471 // If for some reason we ended up in an inconsistent state where it looks like we 1472 // might produce a motion event with no pointers in it, then drop the event. 1473 if (newPointerCount == 0) { 1474 return false; 1475 } 1476 1477 // If the number of pointers is the same and we don't need to perform any fancy 1478 // irreversible transformations, then we can reuse the motion event for this 1479 // dispatch as long as we are careful to revert any changes we make. 1480 final boolean reuse = newPointerCount == oldPointerCount 1481 && (child == null || child.hasIdentityMatrix()); 1482 if (reuse) { 1483 if (child == null) { 1484 handled = super.dispatchTouchEvent(event); 1485 } else { 1486 final float offsetX = mScrollX - child.mLeft; 1487 final float offsetY = mScrollY - child.mTop; 1488 event.offsetLocation(offsetX, offsetY); 1489 1490 handled = child.dispatchTouchEvent(event); 1491 1492 event.offsetLocation(-offsetX, -offsetY); 1493 } 1494 return handled; 1495 } 1496 1497 // Make a copy of the event. 1498 // If the number of pointers is different, then we need to filter out irrelevant pointers 1499 // as we make a copy of the motion event. 1500 MotionEvent transformedEvent; 1501 if (newPointerCount == oldPointerCount) { 1502 transformedEvent = MotionEvent.obtain(event); 1503 } else { 1504 growTmpPointerArrays(newPointerCount); 1505 final int[] newPointerIndexMap = mTmpPointerIndexMap; 1506 final int[] newPointerIds = mTmpPointerIds; 1507 final MotionEvent.PointerCoords[] newPointerCoords = mTmpPointerCoords; 1508 1509 int newPointerIndex = 0; 1510 int oldPointerIndex = 0; 1511 while (newPointerIndex < newPointerCount) { 1512 final int pointerId = event.getPointerId(oldPointerIndex); 1513 final int pointerIdBits = 1 << pointerId; 1514 if ((pointerIdBits & desiredPointerIdBits) != 0) { 1515 newPointerIndexMap[newPointerIndex] = oldPointerIndex; 1516 newPointerIds[newPointerIndex] = pointerId; 1517 if (newPointerCoords[newPointerIndex] == null) { 1518 newPointerCoords[newPointerIndex] = new MotionEvent.PointerCoords(); 1519 } 1520 1521 newPointerIndex += 1; 1522 } 1523 oldPointerIndex += 1; 1524 } 1525 1526 final int newAction; 1527 if (cancel) { 1528 newAction = MotionEvent.ACTION_CANCEL; 1529 } else { 1530 final int oldMaskedAction = oldAction & MotionEvent.ACTION_MASK; 1531 if (oldMaskedAction == MotionEvent.ACTION_POINTER_DOWN 1532 || oldMaskedAction == MotionEvent.ACTION_POINTER_UP) { 1533 final int changedPointerId = event.getPointerId( 1534 (oldAction & MotionEvent.ACTION_POINTER_INDEX_MASK) 1535 >> MotionEvent.ACTION_POINTER_INDEX_SHIFT); 1536 final int changedPointerIdBits = 1 << changedPointerId; 1537 if ((changedPointerIdBits & desiredPointerIdBits) != 0) { 1538 if (newPointerCount == 1) { 1539 // The first/last pointer went down/up. 1540 newAction = oldMaskedAction == MotionEvent.ACTION_POINTER_DOWN 1541 ? MotionEvent.ACTION_DOWN : MotionEvent.ACTION_UP; 1542 } else { 1543 // A secondary pointer went down/up. 1544 int newChangedPointerIndex = 0; 1545 while (newPointerIds[newChangedPointerIndex] != changedPointerId) { 1546 newChangedPointerIndex += 1; 1547 } 1548 newAction = oldMaskedAction | (newChangedPointerIndex 1549 << MotionEvent.ACTION_POINTER_INDEX_SHIFT); 1550 } 1551 } else { 1552 // An unrelated pointer changed. 1553 newAction = MotionEvent.ACTION_MOVE; 1554 } 1555 } else { 1556 // Simple up/down/cancel/move motion action. 1557 newAction = oldMaskedAction; 1558 } 1559 } 1560 1561 transformedEvent = null; 1562 final int historySize = event.getHistorySize(); 1563 for (int historyIndex = 0; historyIndex <= historySize; historyIndex++) { 1564 for (newPointerIndex = 0; newPointerIndex < newPointerCount; newPointerIndex++) { 1565 final MotionEvent.PointerCoords c = newPointerCoords[newPointerIndex]; 1566 oldPointerIndex = newPointerIndexMap[newPointerIndex]; 1567 if (historyIndex != historySize) { 1568 event.getHistoricalPointerCoords(oldPointerIndex, historyIndex, c); 1569 } else { 1570 event.getPointerCoords(oldPointerIndex, c); 1571 } 1572 } 1573 1574 final long eventTime; 1575 if (historyIndex != historySize) { 1576 eventTime = event.getHistoricalEventTime(historyIndex); 1577 } else { 1578 eventTime = event.getEventTime(); 1579 } 1580 1581 if (transformedEvent == null) { 1582 transformedEvent = MotionEvent.obtain( 1583 event.getDownTime(), eventTime, newAction, 1584 newPointerCount, newPointerIds, newPointerCoords, 1585 event.getMetaState(), event.getXPrecision(), event.getYPrecision(), 1586 event.getDeviceId(), event.getEdgeFlags(), event.getSource(), 1587 event.getFlags()); 1588 } else { 1589 transformedEvent.addBatch(eventTime, newPointerCoords, 0); 1590 } 1591 } 1592 } 1593 1594 // Perform any necessary transformations and dispatch. 1595 if (child == null) { 1596 handled = super.dispatchTouchEvent(transformedEvent); 1597 } else { 1598 final float offsetX = mScrollX - child.mLeft; 1599 final float offsetY = mScrollY - child.mTop; 1600 transformedEvent.offsetLocation(offsetX, offsetY); 1601 if (! child.hasIdentityMatrix()) { 1602 transformedEvent.transform(child.getInverseMatrix()); 1603 } 1604 1605 handled = child.dispatchTouchEvent(transformedEvent); 1606 } 1607 1608 // Done. 1609 transformedEvent.recycle(); 1610 return handled; 1611 } 1612 1613 /** 1614 * Enlarge the temporary pointer arrays for splitting pointers. 1615 * May discard contents (but keeps PointerCoords objects to avoid reallocating them). 1616 */ 1617 private void growTmpPointerArrays(int desiredCapacity) { 1618 final MotionEvent.PointerCoords[] oldTmpPointerCoords = mTmpPointerCoords; 1619 int capacity; 1620 if (oldTmpPointerCoords != null) { 1621 capacity = oldTmpPointerCoords.length; 1622 if (desiredCapacity <= capacity) { 1623 return; 1624 } 1625 } else { 1626 capacity = 4; 1627 } 1628 1629 while (capacity < desiredCapacity) { 1630 capacity *= 2; 1631 } 1632 1633 mTmpPointerIndexMap = new int[capacity]; 1634 mTmpPointerIds = new int[capacity]; 1635 mTmpPointerCoords = new MotionEvent.PointerCoords[capacity]; 1636 1637 if (oldTmpPointerCoords != null) { 1638 System.arraycopy(oldTmpPointerCoords, 0, mTmpPointerCoords, 0, 1639 oldTmpPointerCoords.length); 1640 } 1641 } 1642 1643 /** 1644 * Enable or disable the splitting of MotionEvents to multiple children during touch event 1645 * dispatch. This behavior is enabled by default for applications that target an 1646 * SDK version of {@link Build.VERSION_CODES#HONEYCOMB} or newer. 1647 * 1648 * <p>When this option is enabled MotionEvents may be split and dispatched to different child 1649 * views depending on where each pointer initially went down. This allows for user interactions 1650 * such as scrolling two panes of content independently, chording of buttons, and performing 1651 * independent gestures on different pieces of content. 1652 * 1653 * @param split <code>true</code> to allow MotionEvents to be split and dispatched to multiple 1654 * child views. <code>false</code> to only allow one child view to be the target of 1655 * any MotionEvent received by this ViewGroup. 1656 */ 1657 public void setMotionEventSplittingEnabled(boolean split) { 1658 // TODO Applications really shouldn't change this setting mid-touch event, 1659 // but perhaps this should handle that case and send ACTION_CANCELs to any child views 1660 // with gestures in progress when this is changed. 1661 if (split) { 1662 mGroupFlags |= FLAG_SPLIT_MOTION_EVENTS; 1663 } else { 1664 mGroupFlags &= ~FLAG_SPLIT_MOTION_EVENTS; 1665 } 1666 } 1667 1668 /** 1669 * Returns true if MotionEvents dispatched to this ViewGroup can be split to multiple children. 1670 * @return true if MotionEvents dispatched to this ViewGroup can be split to multiple children. 1671 */ 1672 public boolean isMotionEventSplittingEnabled() { 1673 return (mGroupFlags & FLAG_SPLIT_MOTION_EVENTS) == FLAG_SPLIT_MOTION_EVENTS; 1674 } 1675 1676 /** 1677 * {@inheritDoc} 1678 */ 1679 public void requestDisallowInterceptTouchEvent(boolean disallowIntercept) { 1680 1681 if (disallowIntercept == ((mGroupFlags & FLAG_DISALLOW_INTERCEPT) != 0)) { 1682 // We're already in this state, assume our ancestors are too 1683 return; 1684 } 1685 1686 if (disallowIntercept) { 1687 mGroupFlags |= FLAG_DISALLOW_INTERCEPT; 1688 } else { 1689 mGroupFlags &= ~FLAG_DISALLOW_INTERCEPT; 1690 } 1691 1692 // Pass it up to our parent 1693 if (mParent != null) { 1694 mParent.requestDisallowInterceptTouchEvent(disallowIntercept); 1695 } 1696 } 1697 1698 /** 1699 * Implement this method to intercept all touch screen motion events. This 1700 * allows you to watch events as they are dispatched to your children, and 1701 * take ownership of the current gesture at any point. 1702 * 1703 * <p>Using this function takes some care, as it has a fairly complicated 1704 * interaction with {@link View#onTouchEvent(MotionEvent) 1705 * View.onTouchEvent(MotionEvent)}, and using it requires implementing 1706 * that method as well as this one in the correct way. Events will be 1707 * received in the following order: 1708 * 1709 * <ol> 1710 * <li> You will receive the down event here. 1711 * <li> The down event will be handled either by a child of this view 1712 * group, or given to your own onTouchEvent() method to handle; this means 1713 * you should implement onTouchEvent() to return true, so you will 1714 * continue to see the rest of the gesture (instead of looking for 1715 * a parent view to handle it). Also, by returning true from 1716 * onTouchEvent(), you will not receive any following 1717 * events in onInterceptTouchEvent() and all touch processing must 1718 * happen in onTouchEvent() like normal. 1719 * <li> For as long as you return false from this function, each following 1720 * event (up to and including the final up) will be delivered first here 1721 * and then to the target's onTouchEvent(). 1722 * <li> If you return true from here, you will not receive any 1723 * following events: the target view will receive the same event but 1724 * with the action {@link MotionEvent#ACTION_CANCEL}, and all further 1725 * events will be delivered to your onTouchEvent() method and no longer 1726 * appear here. 1727 * </ol> 1728 * 1729 * @param ev The motion event being dispatched down the hierarchy. 1730 * @return Return true to steal motion events from the children and have 1731 * them dispatched to this ViewGroup through onTouchEvent(). 1732 * The current target will receive an ACTION_CANCEL event, and no further 1733 * messages will be delivered here. 1734 */ 1735 public boolean onInterceptTouchEvent(MotionEvent ev) { 1736 return false; 1737 } 1738 1739 /** 1740 * {@inheritDoc} 1741 * 1742 * Looks for a view to give focus to respecting the setting specified by 1743 * {@link #getDescendantFocusability()}. 1744 * 1745 * Uses {@link #onRequestFocusInDescendants(int, android.graphics.Rect)} to 1746 * find focus within the children of this group when appropriate. 1747 * 1748 * @see #FOCUS_BEFORE_DESCENDANTS 1749 * @see #FOCUS_AFTER_DESCENDANTS 1750 * @see #FOCUS_BLOCK_DESCENDANTS 1751 * @see #onRequestFocusInDescendants 1752 */ 1753 @Override 1754 public boolean requestFocus(int direction, Rect previouslyFocusedRect) { 1755 if (DBG) { 1756 System.out.println(this + " ViewGroup.requestFocus direction=" 1757 + direction); 1758 } 1759 int descendantFocusability = getDescendantFocusability(); 1760 1761 switch (descendantFocusability) { 1762 case FOCUS_BLOCK_DESCENDANTS: 1763 return super.requestFocus(direction, previouslyFocusedRect); 1764 case FOCUS_BEFORE_DESCENDANTS: { 1765 final boolean took = super.requestFocus(direction, previouslyFocusedRect); 1766 return took ? took : onRequestFocusInDescendants(direction, previouslyFocusedRect); 1767 } 1768 case FOCUS_AFTER_DESCENDANTS: { 1769 final boolean took = onRequestFocusInDescendants(direction, previouslyFocusedRect); 1770 return took ? took : super.requestFocus(direction, previouslyFocusedRect); 1771 } 1772 default: 1773 throw new IllegalStateException("descendant focusability must be " 1774 + "one of FOCUS_BEFORE_DESCENDANTS, FOCUS_AFTER_DESCENDANTS, FOCUS_BLOCK_DESCENDANTS " 1775 + "but is " + descendantFocusability); 1776 } 1777 } 1778 1779 /** 1780 * Look for a descendant to call {@link View#requestFocus} on. 1781 * Called by {@link ViewGroup#requestFocus(int, android.graphics.Rect)} 1782 * when it wants to request focus within its children. Override this to 1783 * customize how your {@link ViewGroup} requests focus within its children. 1784 * @param direction One of FOCUS_UP, FOCUS_DOWN, FOCUS_LEFT, and FOCUS_RIGHT 1785 * @param previouslyFocusedRect The rectangle (in this View's coordinate system) 1786 * to give a finer grained hint about where focus is coming from. May be null 1787 * if there is no hint. 1788 * @return Whether focus was taken. 1789 */ 1790 @SuppressWarnings({"ConstantConditions"}) 1791 protected boolean onRequestFocusInDescendants(int direction, 1792 Rect previouslyFocusedRect) { 1793 int index; 1794 int increment; 1795 int end; 1796 int count = mChildrenCount; 1797 if ((direction & FOCUS_FORWARD) != 0) { 1798 index = 0; 1799 increment = 1; 1800 end = count; 1801 } else { 1802 index = count - 1; 1803 increment = -1; 1804 end = -1; 1805 } 1806 final View[] children = mChildren; 1807 for (int i = index; i != end; i += increment) { 1808 View child = children[i]; 1809 if ((child.mViewFlags & VISIBILITY_MASK) == VISIBLE) { 1810 if (child.requestFocus(direction, previouslyFocusedRect)) { 1811 return true; 1812 } 1813 } 1814 } 1815 return false; 1816 } 1817 1818 /** 1819 * {@inheritDoc} 1820 * 1821 * @hide 1822 */ 1823 @Override 1824 public void dispatchStartTemporaryDetach() { 1825 super.dispatchStartTemporaryDetach(); 1826 final int count = mChildrenCount; 1827 final View[] children = mChildren; 1828 for (int i = 0; i < count; i++) { 1829 children[i].dispatchStartTemporaryDetach(); 1830 } 1831 } 1832 1833 /** 1834 * {@inheritDoc} 1835 * 1836 * @hide 1837 */ 1838 @Override 1839 public void dispatchFinishTemporaryDetach() { 1840 super.dispatchFinishTemporaryDetach(); 1841 final int count = mChildrenCount; 1842 final View[] children = mChildren; 1843 for (int i = 0; i < count; i++) { 1844 children[i].dispatchFinishTemporaryDetach(); 1845 } 1846 } 1847 1848 /** 1849 * {@inheritDoc} 1850 */ 1851 @Override 1852 void dispatchAttachedToWindow(AttachInfo info, int visibility) { 1853 super.dispatchAttachedToWindow(info, visibility); 1854 visibility |= mViewFlags & VISIBILITY_MASK; 1855 final int count = mChildrenCount; 1856 final View[] children = mChildren; 1857 for (int i = 0; i < count; i++) { 1858 children[i].dispatchAttachedToWindow(info, visibility); 1859 } 1860 } 1861 1862 @Override 1863 public boolean dispatchPopulateAccessibilityEvent(AccessibilityEvent event) { 1864 boolean populated = false; 1865 for (int i = 0, count = getChildCount(); i < count; i++) { 1866 populated |= getChildAt(i).dispatchPopulateAccessibilityEvent(event); 1867 } 1868 return populated; 1869 } 1870 1871 /** 1872 * {@inheritDoc} 1873 */ 1874 @Override 1875 void dispatchDetachedFromWindow() { 1876 // If we still have a touch target, we are still in the process of 1877 // dispatching motion events to a child; we need to get rid of that 1878 // child to avoid dispatching events to it after the window is torn 1879 // down. To make sure we keep the child in a consistent state, we 1880 // first send it an ACTION_CANCEL motion event. 1881 cancelAndClearTouchTargets(null); 1882 1883 // In case view is detached while transition is running 1884 mLayoutSuppressed = false; 1885 1886 // Tear down our drag tracking 1887 mDragNotifiedChildren = null; 1888 if (mCurrentDrag != null) { 1889 mCurrentDrag.recycle(); 1890 mCurrentDrag = null; 1891 } 1892 1893 final int count = mChildrenCount; 1894 final View[] children = mChildren; 1895 for (int i = 0; i < count; i++) { 1896 children[i].dispatchDetachedFromWindow(); 1897 } 1898 super.dispatchDetachedFromWindow(); 1899 } 1900 1901 /** 1902 * {@inheritDoc} 1903 */ 1904 @Override 1905 public void setPadding(int left, int top, int right, int bottom) { 1906 super.setPadding(left, top, right, bottom); 1907 1908 if ((mPaddingLeft | mPaddingTop | mPaddingRight | mPaddingRight) != 0) { 1909 mGroupFlags |= FLAG_PADDING_NOT_NULL; 1910 } else { 1911 mGroupFlags &= ~FLAG_PADDING_NOT_NULL; 1912 } 1913 } 1914 1915 /** 1916 * {@inheritDoc} 1917 */ 1918 @Override 1919 protected void dispatchSaveInstanceState(SparseArray<Parcelable> container) { 1920 super.dispatchSaveInstanceState(container); 1921 final int count = mChildrenCount; 1922 final View[] children = mChildren; 1923 for (int i = 0; i < count; i++) { 1924 View c = children[i]; 1925 if ((c.mViewFlags & PARENT_SAVE_DISABLED_MASK) != PARENT_SAVE_DISABLED) { 1926 c.dispatchSaveInstanceState(container); 1927 } 1928 } 1929 } 1930 1931 /** 1932 * Perform dispatching of a {@link #saveHierarchyState freeze()} to only this view, 1933 * not to its children. For use when overriding 1934 * {@link #dispatchSaveInstanceState dispatchFreeze()} to allow subclasses to freeze 1935 * their own state but not the state of their children. 1936 * 1937 * @param container the container 1938 */ 1939 protected void dispatchFreezeSelfOnly(SparseArray<Parcelable> container) { 1940 super.dispatchSaveInstanceState(container); 1941 } 1942 1943 /** 1944 * {@inheritDoc} 1945 */ 1946 @Override 1947 protected void dispatchRestoreInstanceState(SparseArray<Parcelable> container) { 1948 super.dispatchRestoreInstanceState(container); 1949 final int count = mChildrenCount; 1950 final View[] children = mChildren; 1951 for (int i = 0; i < count; i++) { 1952 View c = children[i]; 1953 if ((c.mViewFlags & PARENT_SAVE_DISABLED_MASK) != PARENT_SAVE_DISABLED) { 1954 c.dispatchRestoreInstanceState(container); 1955 } 1956 } 1957 } 1958 1959 /** 1960 * Perform dispatching of a {@link #restoreHierarchyState thaw()} to only this view, 1961 * not to its children. For use when overriding 1962 * {@link #dispatchRestoreInstanceState dispatchThaw()} to allow subclasses to thaw 1963 * their own state but not the state of their children. 1964 * 1965 * @param container the container 1966 */ 1967 protected void dispatchThawSelfOnly(SparseArray<Parcelable> container) { 1968 super.dispatchRestoreInstanceState(container); 1969 } 1970 1971 /** 1972 * Enables or disables the drawing cache for each child of this view group. 1973 * 1974 * @param enabled true to enable the cache, false to dispose of it 1975 */ 1976 protected void setChildrenDrawingCacheEnabled(boolean enabled) { 1977 if (enabled || (mPersistentDrawingCache & PERSISTENT_ALL_CACHES) != PERSISTENT_ALL_CACHES) { 1978 final View[] children = mChildren; 1979 final int count = mChildrenCount; 1980 for (int i = 0; i < count; i++) { 1981 children[i].setDrawingCacheEnabled(enabled); 1982 } 1983 } 1984 } 1985 1986 @Override 1987 protected void onAnimationStart() { 1988 super.onAnimationStart(); 1989 1990 // When this ViewGroup's animation starts, build the cache for the children 1991 if ((mGroupFlags & FLAG_ANIMATION_CACHE) == FLAG_ANIMATION_CACHE) { 1992 final int count = mChildrenCount; 1993 final View[] children = mChildren; 1994 final boolean buildCache = !isHardwareAccelerated(); 1995 1996 for (int i = 0; i < count; i++) { 1997 final View child = children[i]; 1998 if ((child.mViewFlags & VISIBILITY_MASK) == VISIBLE) { 1999 child.setDrawingCacheEnabled(true); 2000 if (buildCache) { 2001 child.buildDrawingCache(true); 2002 } 2003 } 2004 } 2005 2006 mGroupFlags |= FLAG_CHILDREN_DRAWN_WITH_CACHE; 2007 } 2008 } 2009 2010 @Override 2011 protected void onAnimationEnd() { 2012 super.onAnimationEnd(); 2013 2014 // When this ViewGroup's animation ends, destroy the cache of the children 2015 if ((mGroupFlags & FLAG_ANIMATION_CACHE) == FLAG_ANIMATION_CACHE) { 2016 mGroupFlags &= ~FLAG_CHILDREN_DRAWN_WITH_CACHE; 2017 2018 if ((mPersistentDrawingCache & PERSISTENT_ANIMATION_CACHE) == 0) { 2019 setChildrenDrawingCacheEnabled(false); 2020 } 2021 } 2022 } 2023 2024 @Override 2025 Bitmap createSnapshot(Bitmap.Config quality, int backgroundColor, boolean skipChildren) { 2026 int count = mChildrenCount; 2027 int[] visibilities = null; 2028 2029 if (skipChildren) { 2030 visibilities = new int[count]; 2031 for (int i = 0; i < count; i++) { 2032 View child = getChildAt(i); 2033 visibilities[i] = child.getVisibility(); 2034 if (visibilities[i] == View.VISIBLE) { 2035 child.setVisibility(INVISIBLE); 2036 } 2037 } 2038 } 2039 2040 Bitmap b = super.createSnapshot(quality, backgroundColor, skipChildren); 2041 2042 if (skipChildren) { 2043 for (int i = 0; i < count; i++) { 2044 getChildAt(i).setVisibility(visibilities[i]); 2045 } 2046 } 2047 2048 return b; 2049 } 2050 2051 /** 2052 * {@inheritDoc} 2053 */ 2054 @Override 2055 protected void dispatchDraw(Canvas canvas) { 2056 final int count = mChildrenCount; 2057 final View[] children = mChildren; 2058 int flags = mGroupFlags; 2059 2060 if ((flags & FLAG_RUN_ANIMATION) != 0 && canAnimate()) { 2061 final boolean cache = (mGroupFlags & FLAG_ANIMATION_CACHE) == FLAG_ANIMATION_CACHE; 2062 2063 final boolean buildCache = !isHardwareAccelerated(); 2064 for (int i = 0; i < count; i++) { 2065 final View child = children[i]; 2066 if ((child.mViewFlags & VISIBILITY_MASK) == VISIBLE) { 2067 final LayoutParams params = child.getLayoutParams(); 2068 attachLayoutAnimationParameters(child, params, i, count); 2069 bindLayoutAnimation(child); 2070 if (cache) { 2071 child.setDrawingCacheEnabled(true); 2072 if (buildCache) { 2073 child.buildDrawingCache(true); 2074 } 2075 } 2076 } 2077 } 2078 2079 final LayoutAnimationController controller = mLayoutAnimationController; 2080 if (controller.willOverlap()) { 2081 mGroupFlags |= FLAG_OPTIMIZE_INVALIDATE; 2082 } 2083 2084 controller.start(); 2085 2086 mGroupFlags &= ~FLAG_RUN_ANIMATION; 2087 mGroupFlags &= ~FLAG_ANIMATION_DONE; 2088 2089 if (cache) { 2090 mGroupFlags |= FLAG_CHILDREN_DRAWN_WITH_CACHE; 2091 } 2092 2093 if (mAnimationListener != null) { 2094 mAnimationListener.onAnimationStart(controller.getAnimation()); 2095 } 2096 } 2097 2098 int saveCount = 0; 2099 final boolean clipToPadding = (flags & CLIP_TO_PADDING_MASK) == CLIP_TO_PADDING_MASK; 2100 if (clipToPadding) { 2101 saveCount = canvas.save(); 2102 canvas.clipRect(mScrollX + mPaddingLeft, mScrollY + mPaddingTop, 2103 mScrollX + mRight - mLeft - mPaddingRight, 2104 mScrollY + mBottom - mTop - mPaddingBottom); 2105 2106 } 2107 2108 // We will draw our child's animation, let's reset the flag 2109 mPrivateFlags &= ~DRAW_ANIMATION; 2110 mGroupFlags &= ~FLAG_INVALIDATE_REQUIRED; 2111 2112 boolean more = false; 2113 final long drawingTime = getDrawingTime(); 2114 2115 if ((flags & FLAG_USE_CHILD_DRAWING_ORDER) == 0) { 2116 for (int i = 0; i < count; i++) { 2117 final View child = children[i]; 2118 if ((child.mViewFlags & VISIBILITY_MASK) == VISIBLE || child.getAnimation() != null) { 2119 more |= drawChild(canvas, child, drawingTime); 2120 } 2121 } 2122 } else { 2123 for (int i = 0; i < count; i++) { 2124 final View child = children[getChildDrawingOrder(count, i)]; 2125 if ((child.mViewFlags & VISIBILITY_MASK) == VISIBLE || child.getAnimation() != null) { 2126 more |= drawChild(canvas, child, drawingTime); 2127 } 2128 } 2129 } 2130 2131 // Draw any disappearing views that have animations 2132 if (mDisappearingChildren != null) { 2133 final ArrayList<View> disappearingChildren = mDisappearingChildren; 2134 final int disappearingCount = disappearingChildren.size() - 1; 2135 // Go backwards -- we may delete as animations finish 2136 for (int i = disappearingCount; i >= 0; i--) { 2137 final View child = disappearingChildren.get(i); 2138 more |= drawChild(canvas, child, drawingTime); 2139 } 2140 } 2141 2142 if (clipToPadding) { 2143 canvas.restoreToCount(saveCount); 2144 } 2145 2146 // mGroupFlags might have been updated by drawChild() 2147 flags = mGroupFlags; 2148 2149 if ((flags & FLAG_INVALIDATE_REQUIRED) == FLAG_INVALIDATE_REQUIRED) { 2150 invalidate(); 2151 } 2152 2153 if ((flags & FLAG_ANIMATION_DONE) == 0 && (flags & FLAG_NOTIFY_ANIMATION_LISTENER) == 0 && 2154 mLayoutAnimationController.isDone() && !more) { 2155 // We want to erase the drawing cache and notify the listener after the 2156 // next frame is drawn because one extra invalidate() is caused by 2157 // drawChild() after the animation is over 2158 mGroupFlags |= FLAG_NOTIFY_ANIMATION_LISTENER; 2159 final Runnable end = new Runnable() { 2160 public void run() { 2161 notifyAnimationListener(); 2162 } 2163 }; 2164 post(end); 2165 } 2166 } 2167 2168 /** 2169 * Returns the index of the child to draw for this iteration. Override this 2170 * if you want to change the drawing order of children. By default, it 2171 * returns i. 2172 * <p> 2173 * NOTE: In order for this method to be called, you must enable child ordering 2174 * first by calling {@link #setChildrenDrawingOrderEnabled(boolean)}. 2175 * 2176 * @param i The current iteration. 2177 * @return The index of the child to draw this iteration. 2178 * 2179 * @see #setChildrenDrawingOrderEnabled(boolean) 2180 * @see #isChildrenDrawingOrderEnabled() 2181 */ 2182 protected int getChildDrawingOrder(int childCount, int i) { 2183 return i; 2184 } 2185 2186 private void notifyAnimationListener() { 2187 mGroupFlags &= ~FLAG_NOTIFY_ANIMATION_LISTENER; 2188 mGroupFlags |= FLAG_ANIMATION_DONE; 2189 2190 if (mAnimationListener != null) { 2191 final Runnable end = new Runnable() { 2192 public void run() { 2193 mAnimationListener.onAnimationEnd(mLayoutAnimationController.getAnimation()); 2194 } 2195 }; 2196 post(end); 2197 } 2198 2199 if ((mGroupFlags & FLAG_ANIMATION_CACHE) == FLAG_ANIMATION_CACHE) { 2200 mGroupFlags &= ~FLAG_CHILDREN_DRAWN_WITH_CACHE; 2201 if ((mPersistentDrawingCache & PERSISTENT_ANIMATION_CACHE) == 0) { 2202 setChildrenDrawingCacheEnabled(false); 2203 } 2204 } 2205 2206 invalidate(); 2207 } 2208 2209 /** 2210 * This method is used to cause children of this ViewGroup to restore or recreate their 2211 * display lists. It is called by getDisplayList() when the parent ViewGroup does not need 2212 * to recreate its own display list, which would happen if it went through the normal 2213 * draw/dispatchDraw mechanisms. 2214 * 2215 * @hide 2216 */ 2217 @Override 2218 protected void dispatchGetDisplayList() { 2219 final int count = mChildrenCount; 2220 final View[] children = mChildren; 2221 for (int i = 0; i < count; i++) { 2222 final View child = children[i]; 2223 child.mRecreateDisplayList = (child.mPrivateFlags & INVALIDATED) == INVALIDATED; 2224 child.mPrivateFlags &= ~INVALIDATED; 2225 child.getDisplayList(); 2226 child.mRecreateDisplayList = false; 2227 } 2228 } 2229 2230 /** 2231 * Draw one child of this View Group. This method is responsible for getting 2232 * the canvas in the right state. This includes clipping, translating so 2233 * that the child's scrolled origin is at 0, 0, and applying any animation 2234 * transformations. 2235 * 2236 * @param canvas The canvas on which to draw the child 2237 * @param child Who to draw 2238 * @param drawingTime The time at which draw is occuring 2239 * @return True if an invalidate() was issued 2240 */ 2241 protected boolean drawChild(Canvas canvas, View child, long drawingTime) { 2242 boolean more = false; 2243 2244 final int cl = child.mLeft; 2245 final int ct = child.mTop; 2246 final int cr = child.mRight; 2247 final int cb = child.mBottom; 2248 2249 final boolean childHasIdentityMatrix = child.hasIdentityMatrix(); 2250 2251 final int flags = mGroupFlags; 2252 2253 if ((flags & FLAG_CLEAR_TRANSFORMATION) == FLAG_CLEAR_TRANSFORMATION) { 2254 mChildTransformation.clear(); 2255 mGroupFlags &= ~FLAG_CLEAR_TRANSFORMATION; 2256 } 2257 2258 Transformation transformToApply = null; 2259 Transformation invalidationTransform; 2260 final Animation a = child.getAnimation(); 2261 boolean concatMatrix = false; 2262 2263 boolean scalingRequired = false; 2264 boolean caching; 2265 int layerType = child.getLayerType(); 2266 2267 if ((flags & FLAG_CHILDREN_DRAWN_WITH_CACHE) == FLAG_CHILDREN_DRAWN_WITH_CACHE || 2268 (flags & FLAG_ALWAYS_DRAWN_WITH_CACHE) == FLAG_ALWAYS_DRAWN_WITH_CACHE) { 2269 caching = true; 2270 if (mAttachInfo != null) scalingRequired = mAttachInfo.mScalingRequired; 2271 } else { 2272 caching = (layerType != LAYER_TYPE_NONE) || canvas.isHardwareAccelerated(); 2273 } 2274 2275 if (a != null) { 2276 final boolean initialized = a.isInitialized(); 2277 if (!initialized) { 2278 a.initialize(cr - cl, cb - ct, getWidth(), getHeight()); 2279 a.initializeInvalidateRegion(0, 0, cr - cl, cb - ct); 2280 child.onAnimationStart(); 2281 } 2282 2283 more = a.getTransformation(drawingTime, mChildTransformation, 2284 scalingRequired ? mAttachInfo.mApplicationScale : 1f); 2285 if (scalingRequired && mAttachInfo.mApplicationScale != 1f) { 2286 if (mInvalidationTransformation == null) { 2287 mInvalidationTransformation = new Transformation(); 2288 } 2289 invalidationTransform = mInvalidationTransformation; 2290 a.getTransformation(drawingTime, invalidationTransform, 1f); 2291 } else { 2292 invalidationTransform = mChildTransformation; 2293 } 2294 transformToApply = mChildTransformation; 2295 2296 concatMatrix = a.willChangeTransformationMatrix(); 2297 2298 if (more) { 2299 if (!a.willChangeBounds()) { 2300 if ((flags & (FLAG_OPTIMIZE_INVALIDATE | FLAG_ANIMATION_DONE)) == 2301 FLAG_OPTIMIZE_INVALIDATE) { 2302 mGroupFlags |= FLAG_INVALIDATE_REQUIRED; 2303 } else if ((flags & FLAG_INVALIDATE_REQUIRED) == 0) { 2304 // The child need to draw an animation, potentially offscreen, so 2305 // make sure we do not cancel invalidate requests 2306 mPrivateFlags |= DRAW_ANIMATION; 2307 invalidate(cl, ct, cr, cb); 2308 } 2309 } else { 2310 if (mInvalidateRegion == null) { 2311 mInvalidateRegion = new RectF(); 2312 } 2313 final RectF region = mInvalidateRegion; 2314 a.getInvalidateRegion(0, 0, cr - cl, cb - ct, region, invalidationTransform); 2315 2316 // The child need to draw an animation, potentially offscreen, so 2317 // make sure we do not cancel invalidate requests 2318 mPrivateFlags |= DRAW_ANIMATION; 2319 2320 final int left = cl + (int) region.left; 2321 final int top = ct + (int) region.top; 2322 invalidate(left, top, left + (int) region.width(), top + (int) region.height()); 2323 } 2324 } 2325 } else if ((flags & FLAG_SUPPORT_STATIC_TRANSFORMATIONS) == 2326 FLAG_SUPPORT_STATIC_TRANSFORMATIONS) { 2327 final boolean hasTransform = getChildStaticTransformation(child, mChildTransformation); 2328 if (hasTransform) { 2329 final int transformType = mChildTransformation.getTransformationType(); 2330 transformToApply = transformType != Transformation.TYPE_IDENTITY ? 2331 mChildTransformation : null; 2332 concatMatrix = (transformType & Transformation.TYPE_MATRIX) != 0; 2333 } 2334 } 2335 2336 concatMatrix |= !childHasIdentityMatrix; 2337 2338 // Sets the flag as early as possible to allow draw() implementations 2339 // to call invalidate() successfully when doing animations 2340 child.mPrivateFlags |= DRAWN; 2341 2342 if (!concatMatrix && canvas.quickReject(cl, ct, cr, cb, Canvas.EdgeType.BW) && 2343 (child.mPrivateFlags & DRAW_ANIMATION) == 0) { 2344 return more; 2345 } 2346 2347 float alpha = child.getAlpha(); 2348 // Bail out early if the view does not need to be drawn 2349 if (alpha <= ViewConfiguration.ALPHA_THRESHOLD && (child.mPrivateFlags & ALPHA_SET) == 0 && 2350 !(child instanceof SurfaceView)) { 2351 return more; 2352 } 2353 2354 if (canvas.isHardwareAccelerated()) { 2355 // Clear INVALIDATED flag to allow invalidation to occur during rendering, but 2356 // retain the flag's value temporarily in the mRecreateDisplayList flag 2357 child.mRecreateDisplayList = (child.mPrivateFlags & INVALIDATED) == INVALIDATED; 2358 child.mPrivateFlags &= ~INVALIDATED; 2359 } 2360 2361 child.computeScroll(); 2362 2363 final int sx = child.mScrollX; 2364 final int sy = child.mScrollY; 2365 2366 DisplayList displayList = null; 2367 Bitmap cache = null; 2368 boolean hasDisplayList = false; 2369 if (caching) { 2370 if (!canvas.isHardwareAccelerated()) { 2371 if (layerType != LAYER_TYPE_NONE) { 2372 layerType = LAYER_TYPE_SOFTWARE; 2373 child.buildDrawingCache(true); 2374 } 2375 cache = child.getDrawingCache(true); 2376 } else { 2377 if (layerType == LAYER_TYPE_SOFTWARE) { 2378 child.buildDrawingCache(true); 2379 cache = child.getDrawingCache(true); 2380 } else if (layerType == LAYER_TYPE_NONE) { 2381 // Delay getting the display list until animation-driven alpha values are 2382 // set up and possibly passed on to the view 2383 hasDisplayList = true; 2384 } 2385 } 2386 } 2387 2388 final boolean hasNoCache = cache == null || hasDisplayList; 2389 2390 final int restoreTo = canvas.save(); 2391 if (cache == null && !hasDisplayList) { 2392 canvas.translate(cl - sx, ct - sy); 2393 } else { 2394 canvas.translate(cl, ct); 2395 if (scalingRequired) { 2396 // mAttachInfo cannot be null, otherwise scalingRequired == false 2397 final float scale = 1.0f / mAttachInfo.mApplicationScale; 2398 canvas.scale(scale, scale); 2399 } 2400 } 2401 2402 if (transformToApply != null || alpha < 1.0f || !child.hasIdentityMatrix()) { 2403 if (transformToApply != null || !childHasIdentityMatrix) { 2404 int transX = 0; 2405 int transY = 0; 2406 2407 if (cache == null && !hasDisplayList) { 2408 transX = -sx; 2409 transY = -sy; 2410 } 2411 2412 if (transformToApply != null) { 2413 if (concatMatrix) { 2414 // Undo the scroll translation, apply the transformation matrix, 2415 // then redo the scroll translate to get the correct result. 2416 canvas.translate(-transX, -transY); 2417 canvas.concat(transformToApply.getMatrix()); 2418 canvas.translate(transX, transY); 2419 mGroupFlags |= FLAG_CLEAR_TRANSFORMATION; 2420 } 2421 2422 float transformAlpha = transformToApply.getAlpha(); 2423 if (transformAlpha < 1.0f) { 2424 alpha *= transformToApply.getAlpha(); 2425 mGroupFlags |= FLAG_CLEAR_TRANSFORMATION; 2426 } 2427 } 2428 2429 if (!childHasIdentityMatrix) { 2430 canvas.translate(-transX, -transY); 2431 canvas.concat(child.getMatrix()); 2432 canvas.translate(transX, transY); 2433 } 2434 } 2435 2436 if (alpha < 1.0f) { 2437 mGroupFlags |= FLAG_CLEAR_TRANSFORMATION; 2438 if (hasNoCache) { 2439 final int multipliedAlpha = (int) (255 * alpha); 2440 if (!child.onSetAlpha(multipliedAlpha)) { 2441 int layerFlags = Canvas.HAS_ALPHA_LAYER_SAVE_FLAG; 2442 if ((flags & FLAG_CLIP_CHILDREN) == FLAG_CLIP_CHILDREN || 2443 layerType != LAYER_TYPE_NONE) { 2444 layerFlags |= Canvas.CLIP_TO_LAYER_SAVE_FLAG; 2445 } 2446 if (layerType != LAYER_TYPE_NONE) { 2447 child.mLayerPaint.setAlpha(multipliedAlpha); 2448 } else { 2449 canvas.saveLayerAlpha(sx, sy, sx + cr - cl, sy + cb - ct, 2450 multipliedAlpha, layerFlags); 2451 } 2452 } else { 2453 // Alpha is handled by the child directly, clobber the layer's alpha 2454 if (layerType != LAYER_TYPE_NONE) { 2455 child.mLayerPaint.setAlpha(255); 2456 } 2457 child.mPrivateFlags |= ALPHA_SET; 2458 } 2459 } 2460 } 2461 } else if ((child.mPrivateFlags & ALPHA_SET) == ALPHA_SET) { 2462 child.onSetAlpha(255); 2463 child.mPrivateFlags &= ~ALPHA_SET; 2464 } 2465 2466 if ((flags & FLAG_CLIP_CHILDREN) == FLAG_CLIP_CHILDREN) { 2467 if (cache == null && !hasDisplayList) { 2468 canvas.clipRect(sx, sy, sx + (cr - cl), sy + (cb - ct)); 2469 } else { 2470 if (!scalingRequired || cache == null) { 2471 canvas.clipRect(0, 0, cr - cl, cb - ct); 2472 } else { 2473 canvas.clipRect(0, 0, cache.getWidth(), cache.getHeight()); 2474 } 2475 } 2476 } 2477 2478 if (hasDisplayList) { 2479 displayList = child.getDisplayList(); 2480 } 2481 2482 if (hasNoCache) { 2483 boolean layerRendered = false; 2484 if (layerType == LAYER_TYPE_HARDWARE) { 2485 final HardwareLayer layer = child.getHardwareLayer(); 2486 if (layer != null && layer.isValid()) { 2487 ((HardwareCanvas) canvas).drawHardwareLayer(layer, 0, 0, child.mLayerPaint); 2488 layerRendered = true; 2489 } else { 2490 canvas.saveLayer(sx, sy, sx + cr - cl, sy + cb - ct, child.mLayerPaint, 2491 Canvas.HAS_ALPHA_LAYER_SAVE_FLAG | Canvas.CLIP_TO_LAYER_SAVE_FLAG); 2492 } 2493 } 2494 2495 if (!layerRendered) { 2496 if (!hasDisplayList) { 2497 // Fast path for layouts with no backgrounds 2498 if ((child.mPrivateFlags & SKIP_DRAW) == SKIP_DRAW) { 2499 if (ViewDebug.TRACE_HIERARCHY) { 2500 ViewDebug.trace(this, ViewDebug.HierarchyTraceType.DRAW); 2501 } 2502 child.mPrivateFlags &= ~DIRTY_MASK; 2503 child.dispatchDraw(canvas); 2504 } else { 2505 child.draw(canvas); 2506 } 2507 } else { 2508 child.mPrivateFlags &= ~DIRTY_MASK; 2509 // Skip drawing the display list into ours if we were just refreshing 2510 // it's content; we already have a reference to it in our display list 2511 if (mRecreateDisplayList || mLayerType != LAYER_TYPE_NONE) { 2512 ((HardwareCanvas) canvas).drawDisplayList(displayList); 2513 } 2514 } 2515 } 2516 } else if (cache != null) { 2517 child.mPrivateFlags &= ~DIRTY_MASK; 2518 Paint cachePaint; 2519 2520 if (layerType == LAYER_TYPE_NONE) { 2521 cachePaint = mCachePaint; 2522 if (alpha < 1.0f) { 2523 cachePaint.setAlpha((int) (alpha * 255)); 2524 mGroupFlags |= FLAG_ALPHA_LOWER_THAN_ONE; 2525 } else if ((flags & FLAG_ALPHA_LOWER_THAN_ONE) == FLAG_ALPHA_LOWER_THAN_ONE) { 2526 cachePaint.setAlpha(255); 2527 mGroupFlags &= ~FLAG_ALPHA_LOWER_THAN_ONE; 2528 } 2529 } else { 2530 cachePaint = child.mLayerPaint; 2531 cachePaint.setAlpha((int) (alpha * 255)); 2532 } 2533 canvas.drawBitmap(cache, 0.0f, 0.0f, cachePaint); 2534 } 2535 2536 canvas.restoreToCount(restoreTo); 2537 2538 if (a != null && !more) { 2539 if (!canvas.isHardwareAccelerated() && !a.getFillAfter()) { 2540 child.onSetAlpha(255); 2541 } 2542 finishAnimatingView(child, a); 2543 } 2544 2545 if (more && canvas.isHardwareAccelerated()) { 2546 // invalidation is the trigger to recreate display lists, so if we're using 2547 // display lists to render, force an invalidate to allow the animation to 2548 // continue drawing another frame 2549 invalidate(); 2550 if (a instanceof AlphaAnimation) { 2551 // alpha animations should cause the child to recreate its display list 2552 child.invalidate(); 2553 } 2554 } 2555 2556 child.mRecreateDisplayList = false; 2557 2558 return more; 2559 } 2560 2561 /** 2562 * By default, children are clipped to their bounds before drawing. This 2563 * allows view groups to override this behavior for animations, etc. 2564 * 2565 * @param clipChildren true to clip children to their bounds, 2566 * false otherwise 2567 * @attr ref android.R.styleable#ViewGroup_clipChildren 2568 */ 2569 public void setClipChildren(boolean clipChildren) { 2570 setBooleanFlag(FLAG_CLIP_CHILDREN, clipChildren); 2571 } 2572 2573 /** 2574 * By default, children are clipped to the padding of the ViewGroup. This 2575 * allows view groups to override this behavior 2576 * 2577 * @param clipToPadding true to clip children to the padding of the 2578 * group, false otherwise 2579 * @attr ref android.R.styleable#ViewGroup_clipToPadding 2580 */ 2581 public void setClipToPadding(boolean clipToPadding) { 2582 setBooleanFlag(FLAG_CLIP_TO_PADDING, clipToPadding); 2583 } 2584 2585 /** 2586 * {@inheritDoc} 2587 */ 2588 @Override 2589 public void dispatchSetSelected(boolean selected) { 2590 final View[] children = mChildren; 2591 final int count = mChildrenCount; 2592 for (int i = 0; i < count; i++) { 2593 2594 children[i].setSelected(selected); 2595 } 2596 } 2597 2598 /** 2599 * {@inheritDoc} 2600 */ 2601 @Override 2602 public void dispatchSetActivated(boolean activated) { 2603 final View[] children = mChildren; 2604 final int count = mChildrenCount; 2605 for (int i = 0; i < count; i++) { 2606 2607 children[i].setActivated(activated); 2608 } 2609 } 2610 2611 @Override 2612 protected void dispatchSetPressed(boolean pressed) { 2613 final View[] children = mChildren; 2614 final int count = mChildrenCount; 2615 for (int i = 0; i < count; i++) { 2616 children[i].setPressed(pressed); 2617 } 2618 } 2619 2620 /** 2621 * When this property is set to true, this ViewGroup supports static transformations on 2622 * children; this causes 2623 * {@link #getChildStaticTransformation(View, android.view.animation.Transformation)} to be 2624 * invoked when a child is drawn. 2625 * 2626 * Any subclass overriding 2627 * {@link #getChildStaticTransformation(View, android.view.animation.Transformation)} should 2628 * set this property to true. 2629 * 2630 * @param enabled True to enable static transformations on children, false otherwise. 2631 * 2632 * @see #FLAG_SUPPORT_STATIC_TRANSFORMATIONS 2633 */ 2634 protected void setStaticTransformationsEnabled(boolean enabled) { 2635 setBooleanFlag(FLAG_SUPPORT_STATIC_TRANSFORMATIONS, enabled); 2636 } 2637 2638 /** 2639 * {@inheritDoc} 2640 * 2641 * @see #setStaticTransformationsEnabled(boolean) 2642 */ 2643 protected boolean getChildStaticTransformation(View child, Transformation t) { 2644 return false; 2645 } 2646 2647 /** 2648 * {@hide} 2649 */ 2650 @Override 2651 protected View findViewTraversal(int id) { 2652 if (id == mID) { 2653 return this; 2654 } 2655 2656 final View[] where = mChildren; 2657 final int len = mChildrenCount; 2658 2659 for (int i = 0; i < len; i++) { 2660 View v = where[i]; 2661 2662 if ((v.mPrivateFlags & IS_ROOT_NAMESPACE) == 0) { 2663 v = v.findViewById(id); 2664 2665 if (v != null) { 2666 return v; 2667 } 2668 } 2669 } 2670 2671 return null; 2672 } 2673 2674 /** 2675 * {@hide} 2676 */ 2677 @Override 2678 protected View findViewWithTagTraversal(Object tag) { 2679 if (tag != null && tag.equals(mTag)) { 2680 return this; 2681 } 2682 2683 final View[] where = mChildren; 2684 final int len = mChildrenCount; 2685 2686 for (int i = 0; i < len; i++) { 2687 View v = where[i]; 2688 2689 if ((v.mPrivateFlags & IS_ROOT_NAMESPACE) == 0) { 2690 v = v.findViewWithTag(tag); 2691 2692 if (v != null) { 2693 return v; 2694 } 2695 } 2696 } 2697 2698 return null; 2699 } 2700 2701 /** 2702 * {@hide} 2703 */ 2704 @Override 2705 protected View findViewByPredicateTraversal(Predicate<View> predicate) { 2706 if (predicate.apply(this)) { 2707 return this; 2708 } 2709 2710 final View[] where = mChildren; 2711 final int len = mChildrenCount; 2712 2713 for (int i = 0; i < len; i++) { 2714 View v = where[i]; 2715 2716 if ((v.mPrivateFlags & IS_ROOT_NAMESPACE) == 0) { 2717 v = v.findViewByPredicate(predicate); 2718 2719 if (v != null) { 2720 return v; 2721 } 2722 } 2723 } 2724 2725 return null; 2726 } 2727 2728 /** 2729 * Adds a child view. If no layout parameters are already set on the child, the 2730 * default parameters for this ViewGroup are set on the child. 2731 * 2732 * @param child the child view to add 2733 * 2734 * @see #generateDefaultLayoutParams() 2735 */ 2736 public void addView(View child) { 2737 addView(child, -1); 2738 } 2739 2740 /** 2741 * Adds a child view. If no layout parameters are already set on the child, the 2742 * default parameters for this ViewGroup are set on the child. 2743 * 2744 * @param child the child view to add 2745 * @param index the position at which to add the child 2746 * 2747 * @see #generateDefaultLayoutParams() 2748 */ 2749 public void addView(View child, int index) { 2750 LayoutParams params = child.getLayoutParams(); 2751 if (params == null) { 2752 params = generateDefaultLayoutParams(); 2753 if (params == null) { 2754 throw new IllegalArgumentException("generateDefaultLayoutParams() cannot return null"); 2755 } 2756 } 2757 addView(child, index, params); 2758 } 2759 2760 /** 2761 * Adds a child view with this ViewGroup's default layout parameters and the 2762 * specified width and height. 2763 * 2764 * @param child the child view to add 2765 */ 2766 public void addView(View child, int width, int height) { 2767 final LayoutParams params = generateDefaultLayoutParams(); 2768 params.width = width; 2769 params.height = height; 2770 addView(child, -1, params); 2771 } 2772 2773 /** 2774 * Adds a child view with the specified layout parameters. 2775 * 2776 * @param child the child view to add 2777 * @param params the layout parameters to set on the child 2778 */ 2779 public void addView(View child, LayoutParams params) { 2780 addView(child, -1, params); 2781 } 2782 2783 /** 2784 * Adds a child view with the specified layout parameters. 2785 * 2786 * @param child the child view to add 2787 * @param index the position at which to add the child 2788 * @param params the layout parameters to set on the child 2789 */ 2790 public void addView(View child, int index, LayoutParams params) { 2791 if (DBG) { 2792 System.out.println(this + " addView"); 2793 } 2794 2795 // addViewInner() will call child.requestLayout() when setting the new LayoutParams 2796 // therefore, we call requestLayout() on ourselves before, so that the child's request 2797 // will be blocked at our level 2798 requestLayout(); 2799 invalidate(); 2800 addViewInner(child, index, params, false); 2801 } 2802 2803 /** 2804 * {@inheritDoc} 2805 */ 2806 public void updateViewLayout(View view, ViewGroup.LayoutParams params) { 2807 if (!checkLayoutParams(params)) { 2808 throw new IllegalArgumentException("Invalid LayoutParams supplied to " + this); 2809 } 2810 if (view.mParent != this) { 2811 throw new IllegalArgumentException("Given view not a child of " + this); 2812 } 2813 view.setLayoutParams(params); 2814 } 2815 2816 /** 2817 * {@inheritDoc} 2818 */ 2819 protected boolean checkLayoutParams(ViewGroup.LayoutParams p) { 2820 return p != null; 2821 } 2822 2823 /** 2824 * Interface definition for a callback to be invoked when the hierarchy 2825 * within this view changed. The hierarchy changes whenever a child is added 2826 * to or removed from this view. 2827 */ 2828 public interface OnHierarchyChangeListener { 2829 /** 2830 * Called when a new child is added to a parent view. 2831 * 2832 * @param parent the view in which a child was added 2833 * @param child the new child view added in the hierarchy 2834 */ 2835 void onChildViewAdded(View parent, View child); 2836 2837 /** 2838 * Called when a child is removed from a parent view. 2839 * 2840 * @param parent the view from which the child was removed 2841 * @param child the child removed from the hierarchy 2842 */ 2843 void onChildViewRemoved(View parent, View child); 2844 } 2845 2846 /** 2847 * Register a callback to be invoked when a child is added to or removed 2848 * from this view. 2849 * 2850 * @param listener the callback to invoke on hierarchy change 2851 */ 2852 public void setOnHierarchyChangeListener(OnHierarchyChangeListener listener) { 2853 mOnHierarchyChangeListener = listener; 2854 } 2855 2856 /** 2857 * Adds a view during layout. This is useful if in your onLayout() method, 2858 * you need to add more views (as does the list view for example). 2859 * 2860 * If index is negative, it means put it at the end of the list. 2861 * 2862 * @param child the view to add to the group 2863 * @param index the index at which the child must be added 2864 * @param params the layout parameters to associate with the child 2865 * @return true if the child was added, false otherwise 2866 */ 2867 protected boolean addViewInLayout(View child, int index, LayoutParams params) { 2868 return addViewInLayout(child, index, params, false); 2869 } 2870 2871 /** 2872 * Adds a view during layout. This is useful if in your onLayout() method, 2873 * you need to add more views (as does the list view for example). 2874 * 2875 * If index is negative, it means put it at the end of the list. 2876 * 2877 * @param child the view to add to the group 2878 * @param index the index at which the child must be added 2879 * @param params the layout parameters to associate with the child 2880 * @param preventRequestLayout if true, calling this method will not trigger a 2881 * layout request on child 2882 * @return true if the child was added, false otherwise 2883 */ 2884 protected boolean addViewInLayout(View child, int index, LayoutParams params, 2885 boolean preventRequestLayout) { 2886 child.mParent = null; 2887 addViewInner(child, index, params, preventRequestLayout); 2888 child.mPrivateFlags = (child.mPrivateFlags & ~DIRTY_MASK) | DRAWN; 2889 return true; 2890 } 2891 2892 /** 2893 * Prevents the specified child to be laid out during the next layout pass. 2894 * 2895 * @param child the child on which to perform the cleanup 2896 */ 2897 protected void cleanupLayoutState(View child) { 2898 child.mPrivateFlags &= ~View.FORCE_LAYOUT; 2899 } 2900 2901 private void addViewInner(View child, int index, LayoutParams params, 2902 boolean preventRequestLayout) { 2903 2904 if (child.getParent() != null) { 2905 throw new IllegalStateException("The specified child already has a parent. " + 2906 "You must call removeView() on the child's parent first."); 2907 } 2908 2909 if (mTransition != null) { 2910 mTransition.addChild(this, child); 2911 } 2912 2913 if (!checkLayoutParams(params)) { 2914 params = generateLayoutParams(params); 2915 } 2916 2917 if (preventRequestLayout) { 2918 child.mLayoutParams = params; 2919 } else { 2920 child.setLayoutParams(params); 2921 } 2922 2923 if (index < 0) { 2924 index = mChildrenCount; 2925 } 2926 2927 addInArray(child, index); 2928 2929 // tell our children 2930 if (preventRequestLayout) { 2931 child.assignParent(this); 2932 } else { 2933 child.mParent = this; 2934 } 2935 2936 if (child.hasFocus()) { 2937 requestChildFocus(child, child.findFocus()); 2938 } 2939 2940 AttachInfo ai = mAttachInfo; 2941 if (ai != null) { 2942 boolean lastKeepOn = ai.mKeepScreenOn; 2943 ai.mKeepScreenOn = false; 2944 child.dispatchAttachedToWindow(mAttachInfo, (mViewFlags&VISIBILITY_MASK)); 2945 if (ai.mKeepScreenOn) { 2946 needGlobalAttributesUpdate(true); 2947 } 2948 ai.mKeepScreenOn = lastKeepOn; 2949 } 2950 2951 if (mOnHierarchyChangeListener != null) { 2952 mOnHierarchyChangeListener.onChildViewAdded(this, child); 2953 } 2954 2955 if ((child.mViewFlags & DUPLICATE_PARENT_STATE) == DUPLICATE_PARENT_STATE) { 2956 mGroupFlags |= FLAG_NOTIFY_CHILDREN_ON_DRAWABLE_STATE_CHANGE; 2957 } 2958 } 2959 2960 private void addInArray(View child, int index) { 2961 View[] children = mChildren; 2962 final int count = mChildrenCount; 2963 final int size = children.length; 2964 if (index == count) { 2965 if (size == count) { 2966 mChildren = new View[size + ARRAY_CAPACITY_INCREMENT]; 2967 System.arraycopy(children, 0, mChildren, 0, size); 2968 children = mChildren; 2969 } 2970 children[mChildrenCount++] = child; 2971 } else if (index < count) { 2972 if (size == count) { 2973 mChildren = new View[size + ARRAY_CAPACITY_INCREMENT]; 2974 System.arraycopy(children, 0, mChildren, 0, index); 2975 System.arraycopy(children, index, mChildren, index + 1, count - index); 2976 children = mChildren; 2977 } else { 2978 System.arraycopy(children, index, children, index + 1, count - index); 2979 } 2980 children[index] = child; 2981 mChildrenCount++; 2982 if (mLastTouchDownIndex >= index) { 2983 mLastTouchDownIndex++; 2984 } 2985 } else { 2986 throw new IndexOutOfBoundsException("index=" + index + " count=" + count); 2987 } 2988 } 2989 2990 // This method also sets the child's mParent to null 2991 private void removeFromArray(int index) { 2992 final View[] children = mChildren; 2993 if (!(mTransitioningViews != null && mTransitioningViews.contains(children[index]))) { 2994 children[index].mParent = null; 2995 } 2996 final int count = mChildrenCount; 2997 if (index == count - 1) { 2998 children[--mChildrenCount] = null; 2999 } else if (index >= 0 && index < count) { 3000 System.arraycopy(children, index + 1, children, index, count - index - 1); 3001 children[--mChildrenCount] = null; 3002 } else { 3003 throw new IndexOutOfBoundsException(); 3004 } 3005 if (mLastTouchDownIndex == index) { 3006 mLastTouchDownTime = 0; 3007 mLastTouchDownIndex = -1; 3008 } else if (mLastTouchDownIndex > index) { 3009 mLastTouchDownIndex--; 3010 } 3011 } 3012 3013 // This method also sets the children's mParent to null 3014 private void removeFromArray(int start, int count) { 3015 final View[] children = mChildren; 3016 final int childrenCount = mChildrenCount; 3017 3018 start = Math.max(0, start); 3019 final int end = Math.min(childrenCount, start + count); 3020 3021 if (start == end) { 3022 return; 3023 } 3024 3025 if (end == childrenCount) { 3026 for (int i = start; i < end; i++) { 3027 children[i].mParent = null; 3028 children[i] = null; 3029 } 3030 } else { 3031 for (int i = start; i < end; i++) { 3032 children[i].mParent = null; 3033 } 3034 3035 // Since we're looping above, we might as well do the copy, but is arraycopy() 3036 // faster than the extra 2 bounds checks we would do in the loop? 3037 System.arraycopy(children, end, children, start, childrenCount - end); 3038 3039 for (int i = childrenCount - (end - start); i < childrenCount; i++) { 3040 children[i] = null; 3041 } 3042 } 3043 3044 mChildrenCount -= (end - start); 3045 } 3046 3047 private void bindLayoutAnimation(View child) { 3048 Animation a = mLayoutAnimationController.getAnimationForView(child); 3049 child.setAnimation(a); 3050 } 3051 3052 /** 3053 * Subclasses should override this method to set layout animation 3054 * parameters on the supplied child. 3055 * 3056 * @param child the child to associate with animation parameters 3057 * @param params the child's layout parameters which hold the animation 3058 * parameters 3059 * @param index the index of the child in the view group 3060 * @param count the number of children in the view group 3061 */ 3062 protected void attachLayoutAnimationParameters(View child, 3063 LayoutParams params, int index, int count) { 3064 LayoutAnimationController.AnimationParameters animationParams = 3065 params.layoutAnimationParameters; 3066 if (animationParams == null) { 3067 animationParams = new LayoutAnimationController.AnimationParameters(); 3068 params.layoutAnimationParameters = animationParams; 3069 } 3070 3071 animationParams.count = count; 3072 animationParams.index = index; 3073 } 3074 3075 /** 3076 * {@inheritDoc} 3077 */ 3078 public void removeView(View view) { 3079 removeViewInternal(view); 3080 requestLayout(); 3081 invalidate(); 3082 } 3083 3084 /** 3085 * Removes a view during layout. This is useful if in your onLayout() method, 3086 * you need to remove more views. 3087 * 3088 * @param view the view to remove from the group 3089 */ 3090 public void removeViewInLayout(View view) { 3091 removeViewInternal(view); 3092 } 3093 3094 /** 3095 * Removes a range of views during layout. This is useful if in your onLayout() method, 3096 * you need to remove more views. 3097 * 3098 * @param start the index of the first view to remove from the group 3099 * @param count the number of views to remove from the group 3100 */ 3101 public void removeViewsInLayout(int start, int count) { 3102 removeViewsInternal(start, count); 3103 } 3104 3105 /** 3106 * Removes the view at the specified position in the group. 3107 * 3108 * @param index the position in the group of the view to remove 3109 */ 3110 public void removeViewAt(int index) { 3111 removeViewInternal(index, getChildAt(index)); 3112 requestLayout(); 3113 invalidate(); 3114 } 3115 3116 /** 3117 * Removes the specified range of views from the group. 3118 * 3119 * @param start the first position in the group of the range of views to remove 3120 * @param count the number of views to remove 3121 */ 3122 public void removeViews(int start, int count) { 3123 removeViewsInternal(start, count); 3124 requestLayout(); 3125 invalidate(); 3126 } 3127 3128 private void removeViewInternal(View view) { 3129 final int index = indexOfChild(view); 3130 if (index >= 0) { 3131 removeViewInternal(index, view); 3132 } 3133 } 3134 3135 private void removeViewInternal(int index, View view) { 3136 3137 if (mTransition != null) { 3138 mTransition.removeChild(this, view); 3139 } 3140 3141 boolean clearChildFocus = false; 3142 if (view == mFocused) { 3143 view.clearFocusForRemoval(); 3144 clearChildFocus = true; 3145 } 3146 3147 if (view.getAnimation() != null || 3148 (mTransitioningViews != null && mTransitioningViews.contains(view))) { 3149 addDisappearingView(view); 3150 } else if (view.mAttachInfo != null) { 3151 view.dispatchDetachedFromWindow(); 3152 } 3153 3154 if (mOnHierarchyChangeListener != null) { 3155 mOnHierarchyChangeListener.onChildViewRemoved(this, view); 3156 } 3157 3158 needGlobalAttributesUpdate(false); 3159 3160 removeFromArray(index); 3161 3162 if (clearChildFocus) { 3163 clearChildFocus(view); 3164 } 3165 } 3166 3167 /** 3168 * Sets the LayoutTransition object for this ViewGroup. If the LayoutTransition object is 3169 * not null, changes in layout which occur because of children being added to or removed from 3170 * the ViewGroup will be animated according to the animations defined in that LayoutTransition 3171 * object. By default, the transition object is null (so layout changes are not animated). 3172 * 3173 * @param transition The LayoutTransition object that will animated changes in layout. A value 3174 * of <code>null</code> means no transition will run on layout changes. 3175 * @attr ref android.R.styleable#ViewGroup_animateLayoutChanges 3176 */ 3177 public void setLayoutTransition(LayoutTransition transition) { 3178 if (mTransition != null) { 3179 mTransition.removeTransitionListener(mLayoutTransitionListener); 3180 } 3181 mTransition = transition; 3182 if (mTransition != null) { 3183 mTransition.addTransitionListener(mLayoutTransitionListener); 3184 } 3185 } 3186 3187 /** 3188 * Gets the LayoutTransition object for this ViewGroup. If the LayoutTransition object is 3189 * not null, changes in layout which occur because of children being added to or removed from 3190 * the ViewGroup will be animated according to the animations defined in that LayoutTransition 3191 * object. By default, the transition object is null (so layout changes are not animated). 3192 * 3193 * @return LayoutTranstion The LayoutTransition object that will animated changes in layout. 3194 * A value of <code>null</code> means no transition will run on layout changes. 3195 */ 3196 public LayoutTransition getLayoutTransition() { 3197 return mTransition; 3198 } 3199 3200 private void removeViewsInternal(int start, int count) { 3201 final OnHierarchyChangeListener onHierarchyChangeListener = mOnHierarchyChangeListener; 3202 final boolean notifyListener = onHierarchyChangeListener != null; 3203 final View focused = mFocused; 3204 final boolean detach = mAttachInfo != null; 3205 View clearChildFocus = null; 3206 3207 final View[] children = mChildren; 3208 final int end = start + count; 3209 3210 for (int i = start; i < end; i++) { 3211 final View view = children[i]; 3212 3213 if (mTransition != null) { 3214 mTransition.removeChild(this, view); 3215 } 3216 3217 if (view == focused) { 3218 view.clearFocusForRemoval(); 3219 clearChildFocus = view; 3220 } 3221 3222 if (view.getAnimation() != null || 3223 (mTransitioningViews != null && mTransitioningViews.contains(view))) { 3224 addDisappearingView(view); 3225 } else if (detach) { 3226 view.dispatchDetachedFromWindow(); 3227 } 3228 3229 needGlobalAttributesUpdate(false); 3230 3231 if (notifyListener) { 3232 onHierarchyChangeListener.onChildViewRemoved(this, view); 3233 } 3234 } 3235 3236 removeFromArray(start, count); 3237 3238 if (clearChildFocus != null) { 3239 clearChildFocus(clearChildFocus); 3240 } 3241 } 3242 3243 /** 3244 * Call this method to remove all child views from the 3245 * ViewGroup. 3246 */ 3247 public void removeAllViews() { 3248 removeAllViewsInLayout(); 3249 requestLayout(); 3250 invalidate(); 3251 } 3252 3253 /** 3254 * Called by a ViewGroup subclass to remove child views from itself, 3255 * when it must first know its size on screen before it can calculate how many 3256 * child views it will render. An example is a Gallery or a ListView, which 3257 * may "have" 50 children, but actually only render the number of children 3258 * that can currently fit inside the object on screen. Do not call 3259 * this method unless you are extending ViewGroup and understand the 3260 * view measuring and layout pipeline. 3261 */ 3262 public void removeAllViewsInLayout() { 3263 final int count = mChildrenCount; 3264 if (count <= 0) { 3265 return; 3266 } 3267 3268 final View[] children = mChildren; 3269 mChildrenCount = 0; 3270 3271 final OnHierarchyChangeListener listener = mOnHierarchyChangeListener; 3272 final boolean notify = listener != null; 3273 final View focused = mFocused; 3274 final boolean detach = mAttachInfo != null; 3275 View clearChildFocus = null; 3276 3277 needGlobalAttributesUpdate(false); 3278 3279 for (int i = count - 1; i >= 0; i--) { 3280 final View view = children[i]; 3281 3282 if (mTransition != null) { 3283 mTransition.removeChild(this, view); 3284 } 3285 3286 if (view == focused) { 3287 view.clearFocusForRemoval(); 3288 clearChildFocus = view; 3289 } 3290 3291 if (view.getAnimation() != null || 3292 (mTransitioningViews != null && mTransitioningViews.contains(view))) { 3293 addDisappearingView(view); 3294 } else if (detach) { 3295 view.dispatchDetachedFromWindow(); 3296 } 3297 3298 if (notify) { 3299 listener.onChildViewRemoved(this, view); 3300 } 3301 3302 view.mParent = null; 3303 children[i] = null; 3304 } 3305 3306 if (clearChildFocus != null) { 3307 clearChildFocus(clearChildFocus); 3308 } 3309 } 3310 3311 /** 3312 * Finishes the removal of a detached view. This method will dispatch the detached from 3313 * window event and notify the hierarchy change listener. 3314 * 3315 * @param child the child to be definitely removed from the view hierarchy 3316 * @param animate if true and the view has an animation, the view is placed in the 3317 * disappearing views list, otherwise, it is detached from the window 3318 * 3319 * @see #attachViewToParent(View, int, android.view.ViewGroup.LayoutParams) 3320 * @see #detachAllViewsFromParent() 3321 * @see #detachViewFromParent(View) 3322 * @see #detachViewFromParent(int) 3323 */ 3324 protected void removeDetachedView(View child, boolean animate) { 3325 if (mTransition != null) { 3326 mTransition.removeChild(this, child); 3327 } 3328 3329 if (child == mFocused) { 3330 child.clearFocus(); 3331 } 3332 3333 if ((animate && child.getAnimation() != null) || 3334 (mTransitioningViews != null && mTransitioningViews.contains(child))) { 3335 addDisappearingView(child); 3336 } else if (child.mAttachInfo != null) { 3337 child.dispatchDetachedFromWindow(); 3338 } 3339 3340 if (mOnHierarchyChangeListener != null) { 3341 mOnHierarchyChangeListener.onChildViewRemoved(this, child); 3342 } 3343 } 3344 3345 /** 3346 * Attaches a view to this view group. Attaching a view assigns this group as the parent, 3347 * sets the layout parameters and puts the view in the list of children so it can be retrieved 3348 * by calling {@link #getChildAt(int)}. 3349 * 3350 * This method should be called only for view which were detached from their parent. 3351 * 3352 * @param child the child to attach 3353 * @param index the index at which the child should be attached 3354 * @param params the layout parameters of the child 3355 * 3356 * @see #removeDetachedView(View, boolean) 3357 * @see #detachAllViewsFromParent() 3358 * @see #detachViewFromParent(View) 3359 * @see #detachViewFromParent(int) 3360 */ 3361 protected void attachViewToParent(View child, int index, LayoutParams params) { 3362 child.mLayoutParams = params; 3363 3364 if (index < 0) { 3365 index = mChildrenCount; 3366 } 3367 3368 addInArray(child, index); 3369 3370 child.mParent = this; 3371 child.mPrivateFlags = (child.mPrivateFlags & ~DIRTY_MASK & ~DRAWING_CACHE_VALID) | 3372 DRAWN | INVALIDATED; 3373 this.mPrivateFlags |= INVALIDATED; 3374 3375 if (child.hasFocus()) { 3376 requestChildFocus(child, child.findFocus()); 3377 } 3378 } 3379 3380 /** 3381 * Detaches a view from its parent. Detaching a view should be temporary and followed 3382 * either by a call to {@link #attachViewToParent(View, int, android.view.ViewGroup.LayoutParams)} 3383 * or a call to {@link #removeDetachedView(View, boolean)}. When a view is detached, 3384 * its parent is null and cannot be retrieved by a call to {@link #getChildAt(int)}. 3385 * 3386 * @param child the child to detach 3387 * 3388 * @see #detachViewFromParent(int) 3389 * @see #detachViewsFromParent(int, int) 3390 * @see #detachAllViewsFromParent() 3391 * @see #attachViewToParent(View, int, android.view.ViewGroup.LayoutParams) 3392 * @see #removeDetachedView(View, boolean) 3393 */ 3394 protected void detachViewFromParent(View child) { 3395 removeFromArray(indexOfChild(child)); 3396 } 3397 3398 /** 3399 * Detaches a view from its parent. Detaching a view should be temporary and followed 3400 * either by a call to {@link #attachViewToParent(View, int, android.view.ViewGroup.LayoutParams)} 3401 * or a call to {@link #removeDetachedView(View, boolean)}. When a view is detached, 3402 * its parent is null and cannot be retrieved by a call to {@link #getChildAt(int)}. 3403 * 3404 * @param index the index of the child to detach 3405 * 3406 * @see #detachViewFromParent(View) 3407 * @see #detachAllViewsFromParent() 3408 * @see #detachViewsFromParent(int, int) 3409 * @see #attachViewToParent(View, int, android.view.ViewGroup.LayoutParams) 3410 * @see #removeDetachedView(View, boolean) 3411 */ 3412 protected void detachViewFromParent(int index) { 3413 removeFromArray(index); 3414 } 3415 3416 /** 3417 * Detaches a range of view from their parent. Detaching a view should be temporary and followed 3418 * either by a call to {@link #attachViewToParent(View, int, android.view.ViewGroup.LayoutParams)} 3419 * or a call to {@link #removeDetachedView(View, boolean)}. When a view is detached, its 3420 * parent is null and cannot be retrieved by a call to {@link #getChildAt(int)}. 3421 * 3422 * @param start the first index of the childrend range to detach 3423 * @param count the number of children to detach 3424 * 3425 * @see #detachViewFromParent(View) 3426 * @see #detachViewFromParent(int) 3427 * @see #detachAllViewsFromParent() 3428 * @see #attachViewToParent(View, int, android.view.ViewGroup.LayoutParams) 3429 * @see #removeDetachedView(View, boolean) 3430 */ 3431 protected void detachViewsFromParent(int start, int count) { 3432 removeFromArray(start, count); 3433 } 3434 3435 /** 3436 * Detaches all views from the parent. Detaching a view should be temporary and followed 3437 * either by a call to {@link #attachViewToParent(View, int, android.view.ViewGroup.LayoutParams)} 3438 * or a call to {@link #removeDetachedView(View, boolean)}. When a view is detached, 3439 * its parent is null and cannot be retrieved by a call to {@link #getChildAt(int)}. 3440 * 3441 * @see #detachViewFromParent(View) 3442 * @see #detachViewFromParent(int) 3443 * @see #detachViewsFromParent(int, int) 3444 * @see #attachViewToParent(View, int, android.view.ViewGroup.LayoutParams) 3445 * @see #removeDetachedView(View, boolean) 3446 */ 3447 protected void detachAllViewsFromParent() { 3448 final int count = mChildrenCount; 3449 if (count <= 0) { 3450 return; 3451 } 3452 3453 final View[] children = mChildren; 3454 mChildrenCount = 0; 3455 3456 for (int i = count - 1; i >= 0; i--) { 3457 children[i].mParent = null; 3458 children[i] = null; 3459 } 3460 } 3461 3462 /** 3463 * Don't call or override this method. It is used for the implementation of 3464 * the view hierarchy. 3465 */ 3466 public final void invalidateChild(View child, final Rect dirty) { 3467 if (ViewDebug.TRACE_HIERARCHY) { 3468 ViewDebug.trace(this, ViewDebug.HierarchyTraceType.INVALIDATE_CHILD); 3469 } 3470 3471 ViewParent parent = this; 3472 3473 final AttachInfo attachInfo = mAttachInfo; 3474 if (attachInfo != null) { 3475 // If the child is drawing an animation, we want to copy this flag onto 3476 // ourselves and the parent to make sure the invalidate request goes 3477 // through 3478 final boolean drawAnimation = (child.mPrivateFlags & DRAW_ANIMATION) == DRAW_ANIMATION; 3479 3480 if (dirty == null) { 3481 if (child.mLayerType != LAYER_TYPE_NONE) { 3482 mPrivateFlags |= INVALIDATED; 3483 mPrivateFlags &= ~DRAWING_CACHE_VALID; 3484 } 3485 do { 3486 View view = null; 3487 if (parent instanceof View) { 3488 view = (View) parent; 3489 if (view.mLayerType != LAYER_TYPE_NONE && 3490 view.getParent() instanceof View) { 3491 final View grandParent = (View) view.getParent(); 3492 grandParent.mPrivateFlags |= INVALIDATED; 3493 grandParent.mPrivateFlags &= ~DRAWING_CACHE_VALID; 3494 } 3495 if ((view.mPrivateFlags & DIRTY_MASK) != 0) { 3496 // already marked dirty - we're done 3497 break; 3498 } 3499 } 3500 3501 if (drawAnimation) { 3502 if (view != null) { 3503 view.mPrivateFlags |= DRAW_ANIMATION; 3504 } else if (parent instanceof ViewRoot) { 3505 ((ViewRoot) parent).mIsAnimating = true; 3506 } 3507 } 3508 3509 if (parent instanceof ViewRoot) { 3510 ((ViewRoot) parent).invalidate(); 3511 parent = null; 3512 } else if (view != null) { 3513 if ((view.mPrivateFlags & DRAWN) == DRAWN || 3514 (view.mPrivateFlags & DRAWING_CACHE_VALID) == DRAWING_CACHE_VALID) { 3515 view.mPrivateFlags &= ~DRAWING_CACHE_VALID; 3516 view.mPrivateFlags |= DIRTY; 3517 parent = view.mParent; 3518 } else { 3519 parent = null; 3520 } 3521 } 3522 } while (parent != null); 3523 } else { 3524 // Check whether the child that requests the invalidate is fully opaque 3525 final boolean isOpaque = child.isOpaque() && !drawAnimation && 3526 child.getAnimation() == null; 3527 // Mark the child as dirty, using the appropriate flag 3528 // Make sure we do not set both flags at the same time 3529 int opaqueFlag = isOpaque ? DIRTY_OPAQUE : DIRTY; 3530 3531 final int[] location = attachInfo.mInvalidateChildLocation; 3532 location[CHILD_LEFT_INDEX] = child.mLeft; 3533 location[CHILD_TOP_INDEX] = child.mTop; 3534 Matrix childMatrix = child.getMatrix(); 3535 if (!childMatrix.isIdentity()) { 3536 RectF boundingRect = attachInfo.mTmpTransformRect; 3537 boundingRect.set(dirty); 3538 childMatrix.mapRect(boundingRect); 3539 dirty.set((int) boundingRect.left, (int) boundingRect.top, 3540 (int) (boundingRect.right + 0.5f), 3541 (int) (boundingRect.bottom + 0.5f)); 3542 } 3543 3544 if (child.mLayerType != LAYER_TYPE_NONE) { 3545 mPrivateFlags |= INVALIDATED; 3546 mPrivateFlags &= ~DRAWING_CACHE_VALID; 3547 } 3548 do { 3549 View view = null; 3550 if (parent instanceof View) { 3551 view = (View) parent; 3552 if (view.mLayerType != LAYER_TYPE_NONE && 3553 view.getParent() instanceof View) { 3554 final View grandParent = (View) view.getParent(); 3555 grandParent.mPrivateFlags |= INVALIDATED; 3556 grandParent.mPrivateFlags &= ~DRAWING_CACHE_VALID; 3557 } 3558 } 3559 3560 if (drawAnimation) { 3561 if (view != null) { 3562 view.mPrivateFlags |= DRAW_ANIMATION; 3563 } else if (parent instanceof ViewRoot) { 3564 ((ViewRoot) parent).mIsAnimating = true; 3565 } 3566 } 3567 3568 // If the parent is dirty opaque or not dirty, mark it dirty with the opaque 3569 // flag coming from the child that initiated the invalidate 3570 if (view != null) { 3571 if ((view.mViewFlags & FADING_EDGE_MASK) != 0 && 3572 view.getSolidColor() == 0 && !view.isOpaque()) { 3573 opaqueFlag = DIRTY; 3574 } 3575 if ((view.mPrivateFlags & DIRTY_MASK) != DIRTY) { 3576 view.mPrivateFlags = (view.mPrivateFlags & ~DIRTY_MASK) | opaqueFlag; 3577 } 3578 } 3579 3580 parent = parent.invalidateChildInParent(location, dirty); 3581 if (view != null) { 3582 // Account for transform on current parent 3583 Matrix m = view.getMatrix(); 3584 if (!m.isIdentity()) { 3585 RectF boundingRect = attachInfo.mTmpTransformRect; 3586 boundingRect.set(dirty); 3587 m.mapRect(boundingRect); 3588 dirty.set((int) boundingRect.left, (int) boundingRect.top, 3589 (int) (boundingRect.right + 0.5f), 3590 (int) (boundingRect.bottom + 0.5f)); 3591 } 3592 } 3593 } while (parent != null); 3594 } 3595 } 3596 } 3597 3598 /** 3599 * Don't call or override this method. It is used for the implementation of 3600 * the view hierarchy. 3601 * 3602 * This implementation returns null if this ViewGroup does not have a parent, 3603 * if this ViewGroup is already fully invalidated or if the dirty rectangle 3604 * does not intersect with this ViewGroup's bounds. 3605 */ 3606 public ViewParent invalidateChildInParent(final int[] location, final Rect dirty) { 3607 if (ViewDebug.TRACE_HIERARCHY) { 3608 ViewDebug.trace(this, ViewDebug.HierarchyTraceType.INVALIDATE_CHILD_IN_PARENT); 3609 } 3610 3611 if ((mPrivateFlags & DRAWN) == DRAWN || 3612 (mPrivateFlags & DRAWING_CACHE_VALID) == DRAWING_CACHE_VALID) { 3613 if ((mGroupFlags & (FLAG_OPTIMIZE_INVALIDATE | FLAG_ANIMATION_DONE)) != 3614 FLAG_OPTIMIZE_INVALIDATE) { 3615 dirty.offset(location[CHILD_LEFT_INDEX] - mScrollX, 3616 location[CHILD_TOP_INDEX] - mScrollY); 3617 3618 final int left = mLeft; 3619 final int top = mTop; 3620 3621 if (dirty.intersect(0, 0, mRight - left, mBottom - top) || 3622 (mPrivateFlags & DRAW_ANIMATION) == DRAW_ANIMATION) { 3623 mPrivateFlags &= ~DRAWING_CACHE_VALID; 3624 3625 location[CHILD_LEFT_INDEX] = left; 3626 location[CHILD_TOP_INDEX] = top; 3627 3628 return mParent; 3629 } 3630 } else { 3631 mPrivateFlags &= ~DRAWN & ~DRAWING_CACHE_VALID; 3632 3633 location[CHILD_LEFT_INDEX] = mLeft; 3634 location[CHILD_TOP_INDEX] = mTop; 3635 3636 dirty.set(0, 0, mRight - location[CHILD_LEFT_INDEX], 3637 mBottom - location[CHILD_TOP_INDEX]); 3638 3639 return mParent; 3640 } 3641 } 3642 3643 return null; 3644 } 3645 3646 /** 3647 * Offset a rectangle that is in a descendant's coordinate 3648 * space into our coordinate space. 3649 * @param descendant A descendant of this view 3650 * @param rect A rectangle defined in descendant's coordinate space. 3651 */ 3652 public final void offsetDescendantRectToMyCoords(View descendant, Rect rect) { 3653 offsetRectBetweenParentAndChild(descendant, rect, true, false); 3654 } 3655 3656 /** 3657 * Offset a rectangle that is in our coordinate space into an ancestor's 3658 * coordinate space. 3659 * @param descendant A descendant of this view 3660 * @param rect A rectangle defined in descendant's coordinate space. 3661 */ 3662 public final void offsetRectIntoDescendantCoords(View descendant, Rect rect) { 3663 offsetRectBetweenParentAndChild(descendant, rect, false, false); 3664 } 3665 3666 /** 3667 * Helper method that offsets a rect either from parent to descendant or 3668 * descendant to parent. 3669 */ 3670 void offsetRectBetweenParentAndChild(View descendant, Rect rect, 3671 boolean offsetFromChildToParent, boolean clipToBounds) { 3672 3673 // already in the same coord system :) 3674 if (descendant == this) { 3675 return; 3676 } 3677 3678 ViewParent theParent = descendant.mParent; 3679 3680 // search and offset up to the parent 3681 while ((theParent != null) 3682 && (theParent instanceof View) 3683 && (theParent != this)) { 3684 3685 if (offsetFromChildToParent) { 3686 rect.offset(descendant.mLeft - descendant.mScrollX, 3687 descendant.mTop - descendant.mScrollY); 3688 if (clipToBounds) { 3689 View p = (View) theParent; 3690 rect.intersect(0, 0, p.mRight - p.mLeft, p.mBottom - p.mTop); 3691 } 3692 } else { 3693 if (clipToBounds) { 3694 View p = (View) theParent; 3695 rect.intersect(0, 0, p.mRight - p.mLeft, p.mBottom - p.mTop); 3696 } 3697 rect.offset(descendant.mScrollX - descendant.mLeft, 3698 descendant.mScrollY - descendant.mTop); 3699 } 3700 3701 descendant = (View) theParent; 3702 theParent = descendant.mParent; 3703 } 3704 3705 // now that we are up to this view, need to offset one more time 3706 // to get into our coordinate space 3707 if (theParent == this) { 3708 if (offsetFromChildToParent) { 3709 rect.offset(descendant.mLeft - descendant.mScrollX, 3710 descendant.mTop - descendant.mScrollY); 3711 } else { 3712 rect.offset(descendant.mScrollX - descendant.mLeft, 3713 descendant.mScrollY - descendant.mTop); 3714 } 3715 } else { 3716 throw new IllegalArgumentException("parameter must be a descendant of this view"); 3717 } 3718 } 3719 3720 /** 3721 * Offset the vertical location of all children of this view by the specified number of pixels. 3722 * 3723 * @param offset the number of pixels to offset 3724 * 3725 * @hide 3726 */ 3727 public void offsetChildrenTopAndBottom(int offset) { 3728 final int count = mChildrenCount; 3729 final View[] children = mChildren; 3730 3731 for (int i = 0; i < count; i++) { 3732 final View v = children[i]; 3733 v.mTop += offset; 3734 v.mBottom += offset; 3735 } 3736 } 3737 3738 /** 3739 * {@inheritDoc} 3740 */ 3741 public boolean getChildVisibleRect(View child, Rect r, android.graphics.Point offset) { 3742 int dx = child.mLeft - mScrollX; 3743 int dy = child.mTop - mScrollY; 3744 if (offset != null) { 3745 offset.x += dx; 3746 offset.y += dy; 3747 } 3748 r.offset(dx, dy); 3749 return r.intersect(0, 0, mRight - mLeft, mBottom - mTop) && 3750 (mParent == null || mParent.getChildVisibleRect(this, r, offset)); 3751 } 3752 3753 /** 3754 * {@inheritDoc} 3755 */ 3756 @Override 3757 public final void layout(int l, int t, int r, int b) { 3758 if (mTransition == null || !mTransition.isChangingLayout()) { 3759 super.layout(l, t, r, b); 3760 } else { 3761 // record the fact that we noop'd it; request layout when transition finishes 3762 mLayoutSuppressed = true; 3763 } 3764 } 3765 3766 /** 3767 * {@inheritDoc} 3768 */ 3769 @Override 3770 protected abstract void onLayout(boolean changed, 3771 int l, int t, int r, int b); 3772 3773 /** 3774 * Indicates whether the view group has the ability to animate its children 3775 * after the first layout. 3776 * 3777 * @return true if the children can be animated, false otherwise 3778 */ 3779 protected boolean canAnimate() { 3780 return mLayoutAnimationController != null; 3781 } 3782 3783 /** 3784 * Runs the layout animation. Calling this method triggers a relayout of 3785 * this view group. 3786 */ 3787 public void startLayoutAnimation() { 3788 if (mLayoutAnimationController != null) { 3789 mGroupFlags |= FLAG_RUN_ANIMATION; 3790 requestLayout(); 3791 } 3792 } 3793 3794 /** 3795 * Schedules the layout animation to be played after the next layout pass 3796 * of this view group. This can be used to restart the layout animation 3797 * when the content of the view group changes or when the activity is 3798 * paused and resumed. 3799 */ 3800 public void scheduleLayoutAnimation() { 3801 mGroupFlags |= FLAG_RUN_ANIMATION; 3802 } 3803 3804 /** 3805 * Sets the layout animation controller used to animate the group's 3806 * children after the first layout. 3807 * 3808 * @param controller the animation controller 3809 */ 3810 public void setLayoutAnimation(LayoutAnimationController controller) { 3811 mLayoutAnimationController = controller; 3812 if (mLayoutAnimationController != null) { 3813 mGroupFlags |= FLAG_RUN_ANIMATION; 3814 } 3815 } 3816 3817 /** 3818 * Returns the layout animation controller used to animate the group's 3819 * children. 3820 * 3821 * @return the current animation controller 3822 */ 3823 public LayoutAnimationController getLayoutAnimation() { 3824 return mLayoutAnimationController; 3825 } 3826 3827 /** 3828 * Indicates whether the children's drawing cache is used during a layout 3829 * animation. By default, the drawing cache is enabled but this will prevent 3830 * nested layout animations from working. To nest animations, you must disable 3831 * the cache. 3832 * 3833 * @return true if the animation cache is enabled, false otherwise 3834 * 3835 * @see #setAnimationCacheEnabled(boolean) 3836 * @see View#setDrawingCacheEnabled(boolean) 3837 */ 3838 @ViewDebug.ExportedProperty 3839 public boolean isAnimationCacheEnabled() { 3840 return (mGroupFlags & FLAG_ANIMATION_CACHE) == FLAG_ANIMATION_CACHE; 3841 } 3842 3843 /** 3844 * Enables or disables the children's drawing cache during a layout animation. 3845 * By default, the drawing cache is enabled but this will prevent nested 3846 * layout animations from working. To nest animations, you must disable the 3847 * cache. 3848 * 3849 * @param enabled true to enable the animation cache, false otherwise 3850 * 3851 * @see #isAnimationCacheEnabled() 3852 * @see View#setDrawingCacheEnabled(boolean) 3853 */ 3854 public void setAnimationCacheEnabled(boolean enabled) { 3855 setBooleanFlag(FLAG_ANIMATION_CACHE, enabled); 3856 } 3857 3858 /** 3859 * Indicates whether this ViewGroup will always try to draw its children using their 3860 * drawing cache. By default this property is enabled. 3861 * 3862 * @return true if the animation cache is enabled, false otherwise 3863 * 3864 * @see #setAlwaysDrawnWithCacheEnabled(boolean) 3865 * @see #setChildrenDrawnWithCacheEnabled(boolean) 3866 * @see View#setDrawingCacheEnabled(boolean) 3867 */ 3868 @ViewDebug.ExportedProperty(category = "drawing") 3869 public boolean isAlwaysDrawnWithCacheEnabled() { 3870 return (mGroupFlags & FLAG_ALWAYS_DRAWN_WITH_CACHE) == FLAG_ALWAYS_DRAWN_WITH_CACHE; 3871 } 3872 3873 /** 3874 * Indicates whether this ViewGroup will always try to draw its children using their 3875 * drawing cache. This property can be set to true when the cache rendering is 3876 * slightly different from the children's normal rendering. Renderings can be different, 3877 * for instance, when the cache's quality is set to low. 3878 * 3879 * When this property is disabled, the ViewGroup will use the drawing cache of its 3880 * children only when asked to. It's usually the task of subclasses to tell ViewGroup 3881 * when to start using the drawing cache and when to stop using it. 3882 * 3883 * @param always true to always draw with the drawing cache, false otherwise 3884 * 3885 * @see #isAlwaysDrawnWithCacheEnabled() 3886 * @see #setChildrenDrawnWithCacheEnabled(boolean) 3887 * @see View#setDrawingCacheEnabled(boolean) 3888 * @see View#setDrawingCacheQuality(int) 3889 */ 3890 public void setAlwaysDrawnWithCacheEnabled(boolean always) { 3891 setBooleanFlag(FLAG_ALWAYS_DRAWN_WITH_CACHE, always); 3892 } 3893 3894 /** 3895 * Indicates whether the ViewGroup is currently drawing its children using 3896 * their drawing cache. 3897 * 3898 * @return true if children should be drawn with their cache, false otherwise 3899 * 3900 * @see #setAlwaysDrawnWithCacheEnabled(boolean) 3901 * @see #setChildrenDrawnWithCacheEnabled(boolean) 3902 */ 3903 @ViewDebug.ExportedProperty(category = "drawing") 3904 protected boolean isChildrenDrawnWithCacheEnabled() { 3905 return (mGroupFlags & FLAG_CHILDREN_DRAWN_WITH_CACHE) == FLAG_CHILDREN_DRAWN_WITH_CACHE; 3906 } 3907 3908 /** 3909 * Tells the ViewGroup to draw its children using their drawing cache. This property 3910 * is ignored when {@link #isAlwaysDrawnWithCacheEnabled()} is true. A child's drawing cache 3911 * will be used only if it has been enabled. 3912 * 3913 * Subclasses should call this method to start and stop using the drawing cache when 3914 * they perform performance sensitive operations, like scrolling or animating. 3915 * 3916 * @param enabled true if children should be drawn with their cache, false otherwise 3917 * 3918 * @see #setAlwaysDrawnWithCacheEnabled(boolean) 3919 * @see #isChildrenDrawnWithCacheEnabled() 3920 */ 3921 protected void setChildrenDrawnWithCacheEnabled(boolean enabled) { 3922 setBooleanFlag(FLAG_CHILDREN_DRAWN_WITH_CACHE, enabled); 3923 } 3924 3925 /** 3926 * Indicates whether the ViewGroup is drawing its children in the order defined by 3927 * {@link #getChildDrawingOrder(int, int)}. 3928 * 3929 * @return true if children drawing order is defined by {@link #getChildDrawingOrder(int, int)}, 3930 * false otherwise 3931 * 3932 * @see #setChildrenDrawingOrderEnabled(boolean) 3933 * @see #getChildDrawingOrder(int, int) 3934 */ 3935 @ViewDebug.ExportedProperty(category = "drawing") 3936 protected boolean isChildrenDrawingOrderEnabled() { 3937 return (mGroupFlags & FLAG_USE_CHILD_DRAWING_ORDER) == FLAG_USE_CHILD_DRAWING_ORDER; 3938 } 3939 3940 /** 3941 * Tells the ViewGroup whether to draw its children in the order defined by the method 3942 * {@link #getChildDrawingOrder(int, int)}. 3943 * 3944 * @param enabled true if the order of the children when drawing is determined by 3945 * {@link #getChildDrawingOrder(int, int)}, false otherwise 3946 * 3947 * @see #isChildrenDrawingOrderEnabled() 3948 * @see #getChildDrawingOrder(int, int) 3949 */ 3950 protected void setChildrenDrawingOrderEnabled(boolean enabled) { 3951 setBooleanFlag(FLAG_USE_CHILD_DRAWING_ORDER, enabled); 3952 } 3953 3954 private void setBooleanFlag(int flag, boolean value) { 3955 if (value) { 3956 mGroupFlags |= flag; 3957 } else { 3958 mGroupFlags &= ~flag; 3959 } 3960 } 3961 3962 /** 3963 * Returns an integer indicating what types of drawing caches are kept in memory. 3964 * 3965 * @see #setPersistentDrawingCache(int) 3966 * @see #setAnimationCacheEnabled(boolean) 3967 * 3968 * @return one or a combination of {@link #PERSISTENT_NO_CACHE}, 3969 * {@link #PERSISTENT_ANIMATION_CACHE}, {@link #PERSISTENT_SCROLLING_CACHE} 3970 * and {@link #PERSISTENT_ALL_CACHES} 3971 */ 3972 @ViewDebug.ExportedProperty(category = "drawing", mapping = { 3973 @ViewDebug.IntToString(from = PERSISTENT_NO_CACHE, to = "NONE"), 3974 @ViewDebug.IntToString(from = PERSISTENT_ANIMATION_CACHE, to = "ANIMATION"), 3975 @ViewDebug.IntToString(from = PERSISTENT_SCROLLING_CACHE, to = "SCROLLING"), 3976 @ViewDebug.IntToString(from = PERSISTENT_ALL_CACHES, to = "ALL") 3977 }) 3978 public int getPersistentDrawingCache() { 3979 return mPersistentDrawingCache; 3980 } 3981 3982 /** 3983 * Indicates what types of drawing caches should be kept in memory after 3984 * they have been created. 3985 * 3986 * @see #getPersistentDrawingCache() 3987 * @see #setAnimationCacheEnabled(boolean) 3988 * 3989 * @param drawingCacheToKeep one or a combination of {@link #PERSISTENT_NO_CACHE}, 3990 * {@link #PERSISTENT_ANIMATION_CACHE}, {@link #PERSISTENT_SCROLLING_CACHE} 3991 * and {@link #PERSISTENT_ALL_CACHES} 3992 */ 3993 public void setPersistentDrawingCache(int drawingCacheToKeep) { 3994 mPersistentDrawingCache = drawingCacheToKeep & PERSISTENT_ALL_CACHES; 3995 } 3996 3997 /** 3998 * Returns a new set of layout parameters based on the supplied attributes set. 3999 * 4000 * @param attrs the attributes to build the layout parameters from 4001 * 4002 * @return an instance of {@link android.view.ViewGroup.LayoutParams} or one 4003 * of its descendants 4004 */ 4005 public LayoutParams generateLayoutParams(AttributeSet attrs) { 4006 return new LayoutParams(getContext(), attrs); 4007 } 4008 4009 /** 4010 * Returns a safe set of layout parameters based on the supplied layout params. 4011 * When a ViewGroup is passed a View whose layout params do not pass the test of 4012 * {@link #checkLayoutParams(android.view.ViewGroup.LayoutParams)}, this method 4013 * is invoked. This method should return a new set of layout params suitable for 4014 * this ViewGroup, possibly by copying the appropriate attributes from the 4015 * specified set of layout params. 4016 * 4017 * @param p The layout parameters to convert into a suitable set of layout parameters 4018 * for this ViewGroup. 4019 * 4020 * @return an instance of {@link android.view.ViewGroup.LayoutParams} or one 4021 * of its descendants 4022 */ 4023 protected LayoutParams generateLayoutParams(ViewGroup.LayoutParams p) { 4024 return p; 4025 } 4026 4027 /** 4028 * Returns a set of default layout parameters. These parameters are requested 4029 * when the View passed to {@link #addView(View)} has no layout parameters 4030 * already set. If null is returned, an exception is thrown from addView. 4031 * 4032 * @return a set of default layout parameters or null 4033 */ 4034 protected LayoutParams generateDefaultLayoutParams() { 4035 return new LayoutParams(LayoutParams.WRAP_CONTENT, LayoutParams.WRAP_CONTENT); 4036 } 4037 4038 /** 4039 * @hide 4040 */ 4041 @Override 4042 protected boolean dispatchConsistencyCheck(int consistency) { 4043 boolean result = super.dispatchConsistencyCheck(consistency); 4044 4045 final int count = mChildrenCount; 4046 final View[] children = mChildren; 4047 for (int i = 0; i < count; i++) { 4048 if (!children[i].dispatchConsistencyCheck(consistency)) result = false; 4049 } 4050 4051 return result; 4052 } 4053 4054 /** 4055 * @hide 4056 */ 4057 @Override 4058 protected boolean onConsistencyCheck(int consistency) { 4059 boolean result = super.onConsistencyCheck(consistency); 4060 4061 final boolean checkLayout = (consistency & ViewDebug.CONSISTENCY_LAYOUT) != 0; 4062 final boolean checkDrawing = (consistency & ViewDebug.CONSISTENCY_DRAWING) != 0; 4063 4064 if (checkLayout) { 4065 final int count = mChildrenCount; 4066 final View[] children = mChildren; 4067 for (int i = 0; i < count; i++) { 4068 if (children[i].getParent() != this) { 4069 result = false; 4070 android.util.Log.d(ViewDebug.CONSISTENCY_LOG_TAG, 4071 "View " + children[i] + " has no parent/a parent that is not " + this); 4072 } 4073 } 4074 } 4075 4076 if (checkDrawing) { 4077 // If this group is dirty, check that the parent is dirty as well 4078 if ((mPrivateFlags & DIRTY_MASK) != 0) { 4079 final ViewParent parent = getParent(); 4080 if (parent != null && !(parent instanceof ViewRoot)) { 4081 if ((((View) parent).mPrivateFlags & DIRTY_MASK) == 0) { 4082 result = false; 4083 android.util.Log.d(ViewDebug.CONSISTENCY_LOG_TAG, 4084 "ViewGroup " + this + " is dirty but its parent is not: " + this); 4085 } 4086 } 4087 } 4088 } 4089 4090 return result; 4091 } 4092 4093 /** 4094 * {@inheritDoc} 4095 */ 4096 @Override 4097 protected void debug(int depth) { 4098 super.debug(depth); 4099 String output; 4100 4101 if (mFocused != null) { 4102 output = debugIndent(depth); 4103 output += "mFocused"; 4104 Log.d(VIEW_LOG_TAG, output); 4105 } 4106 if (mChildrenCount != 0) { 4107 output = debugIndent(depth); 4108 output += "{"; 4109 Log.d(VIEW_LOG_TAG, output); 4110 } 4111 int count = mChildrenCount; 4112 for (int i = 0; i < count; i++) { 4113 View child = mChildren[i]; 4114 child.debug(depth + 1); 4115 } 4116 4117 if (mChildrenCount != 0) { 4118 output = debugIndent(depth); 4119 output += "}"; 4120 Log.d(VIEW_LOG_TAG, output); 4121 } 4122 } 4123 4124 /** 4125 * Returns the position in the group of the specified child view. 4126 * 4127 * @param child the view for which to get the position 4128 * @return a positive integer representing the position of the view in the 4129 * group, or -1 if the view does not exist in the group 4130 */ 4131 public int indexOfChild(View child) { 4132 final int count = mChildrenCount; 4133 final View[] children = mChildren; 4134 for (int i = 0; i < count; i++) { 4135 if (children[i] == child) { 4136 return i; 4137 } 4138 } 4139 return -1; 4140 } 4141 4142 /** 4143 * Returns the number of children in the group. 4144 * 4145 * @return a positive integer representing the number of children in 4146 * the group 4147 */ 4148 public int getChildCount() { 4149 return mChildrenCount; 4150 } 4151 4152 /** 4153 * Returns the view at the specified position in the group. 4154 * 4155 * @param index the position at which to get the view from 4156 * @return the view at the specified position or null if the position 4157 * does not exist within the group 4158 */ 4159 public View getChildAt(int index) { 4160 try { 4161 return mChildren[index]; 4162 } catch (IndexOutOfBoundsException ex) { 4163 return null; 4164 } 4165 } 4166 4167 /** 4168 * Ask all of the children of this view to measure themselves, taking into 4169 * account both the MeasureSpec requirements for this view and its padding. 4170 * We skip children that are in the GONE state The heavy lifting is done in 4171 * getChildMeasureSpec. 4172 * 4173 * @param widthMeasureSpec The width requirements for this view 4174 * @param heightMeasureSpec The height requirements for this view 4175 */ 4176 protected void measureChildren(int widthMeasureSpec, int heightMeasureSpec) { 4177 final int size = mChildrenCount; 4178 final View[] children = mChildren; 4179 for (int i = 0; i < size; ++i) { 4180 final View child = children[i]; 4181 if ((child.mViewFlags & VISIBILITY_MASK) != GONE) { 4182 measureChild(child, widthMeasureSpec, heightMeasureSpec); 4183 } 4184 } 4185 } 4186 4187 /** 4188 * Ask one of the children of this view to measure itself, taking into 4189 * account both the MeasureSpec requirements for this view and its padding. 4190 * The heavy lifting is done in getChildMeasureSpec. 4191 * 4192 * @param child The child to measure 4193 * @param parentWidthMeasureSpec The width requirements for this view 4194 * @param parentHeightMeasureSpec The height requirements for this view 4195 */ 4196 protected void measureChild(View child, int parentWidthMeasureSpec, 4197 int parentHeightMeasureSpec) { 4198 final LayoutParams lp = child.getLayoutParams(); 4199 4200 final int childWidthMeasureSpec = getChildMeasureSpec(parentWidthMeasureSpec, 4201 mPaddingLeft + mPaddingRight, lp.width); 4202 final int childHeightMeasureSpec = getChildMeasureSpec(parentHeightMeasureSpec, 4203 mPaddingTop + mPaddingBottom, lp.height); 4204 4205 child.measure(childWidthMeasureSpec, childHeightMeasureSpec); 4206 } 4207 4208 /** 4209 * Ask one of the children of this view to measure itself, taking into 4210 * account both the MeasureSpec requirements for this view and its padding 4211 * and margins. The child must have MarginLayoutParams The heavy lifting is 4212 * done in getChildMeasureSpec. 4213 * 4214 * @param child The child to measure 4215 * @param parentWidthMeasureSpec The width requirements for this view 4216 * @param widthUsed Extra space that has been used up by the parent 4217 * horizontally (possibly by other children of the parent) 4218 * @param parentHeightMeasureSpec The height requirements for this view 4219 * @param heightUsed Extra space that has been used up by the parent 4220 * vertically (possibly by other children of the parent) 4221 */ 4222 protected void measureChildWithMargins(View child, 4223 int parentWidthMeasureSpec, int widthUsed, 4224 int parentHeightMeasureSpec, int heightUsed) { 4225 final MarginLayoutParams lp = (MarginLayoutParams) child.getLayoutParams(); 4226 4227 final int childWidthMeasureSpec = getChildMeasureSpec(parentWidthMeasureSpec, 4228 mPaddingLeft + mPaddingRight + lp.leftMargin + lp.rightMargin 4229 + widthUsed, lp.width); 4230 final int childHeightMeasureSpec = getChildMeasureSpec(parentHeightMeasureSpec, 4231 mPaddingTop + mPaddingBottom + lp.topMargin + lp.bottomMargin 4232 + heightUsed, lp.height); 4233 4234 child.measure(childWidthMeasureSpec, childHeightMeasureSpec); 4235 } 4236 4237 /** 4238 * Does the hard part of measureChildren: figuring out the MeasureSpec to 4239 * pass to a particular child. This method figures out the right MeasureSpec 4240 * for one dimension (height or width) of one child view. 4241 * 4242 * The goal is to combine information from our MeasureSpec with the 4243 * LayoutParams of the child to get the best possible results. For example, 4244 * if the this view knows its size (because its MeasureSpec has a mode of 4245 * EXACTLY), and the child has indicated in its LayoutParams that it wants 4246 * to be the same size as the parent, the parent should ask the child to 4247 * layout given an exact size. 4248 * 4249 * @param spec The requirements for this view 4250 * @param padding The padding of this view for the current dimension and 4251 * margins, if applicable 4252 * @param childDimension How big the child wants to be in the current 4253 * dimension 4254 * @return a MeasureSpec integer for the child 4255 */ 4256 public static int getChildMeasureSpec(int spec, int padding, int childDimension) { 4257 int specMode = MeasureSpec.getMode(spec); 4258 int specSize = MeasureSpec.getSize(spec); 4259 4260 int size = Math.max(0, specSize - padding); 4261 4262 int resultSize = 0; 4263 int resultMode = 0; 4264 4265 switch (specMode) { 4266 // Parent has imposed an exact size on us 4267 case MeasureSpec.EXACTLY: 4268 if (childDimension >= 0) { 4269 resultSize = childDimension; 4270 resultMode = MeasureSpec.EXACTLY; 4271 } else if (childDimension == LayoutParams.MATCH_PARENT) { 4272 // Child wants to be our size. So be it. 4273 resultSize = size; 4274 resultMode = MeasureSpec.EXACTLY; 4275 } else if (childDimension == LayoutParams.WRAP_CONTENT) { 4276 // Child wants to determine its own size. It can't be 4277 // bigger than us. 4278 resultSize = size; 4279 resultMode = MeasureSpec.AT_MOST; 4280 } 4281 break; 4282 4283 // Parent has imposed a maximum size on us 4284 case MeasureSpec.AT_MOST: 4285 if (childDimension >= 0) { 4286 // Child wants a specific size... so be it 4287 resultSize = childDimension; 4288 resultMode = MeasureSpec.EXACTLY; 4289 } else if (childDimension == LayoutParams.MATCH_PARENT) { 4290 // Child wants to be our size, but our size is not fixed. 4291 // Constrain child to not be bigger than us. 4292 resultSize = size; 4293 resultMode = MeasureSpec.AT_MOST; 4294 } else if (childDimension == LayoutParams.WRAP_CONTENT) { 4295 // Child wants to determine its own size. It can't be 4296 // bigger than us. 4297 resultSize = size; 4298 resultMode = MeasureSpec.AT_MOST; 4299 } 4300 break; 4301 4302 // Parent asked to see how big we want to be 4303 case MeasureSpec.UNSPECIFIED: 4304 if (childDimension >= 0) { 4305 // Child wants a specific size... let him have it 4306 resultSize = childDimension; 4307 resultMode = MeasureSpec.EXACTLY; 4308 } else if (childDimension == LayoutParams.MATCH_PARENT) { 4309 // Child wants to be our size... find out how big it should 4310 // be 4311 resultSize = 0; 4312 resultMode = MeasureSpec.UNSPECIFIED; 4313 } else if (childDimension == LayoutParams.WRAP_CONTENT) { 4314 // Child wants to determine its own size.... find out how 4315 // big it should be 4316 resultSize = 0; 4317 resultMode = MeasureSpec.UNSPECIFIED; 4318 } 4319 break; 4320 } 4321 return MeasureSpec.makeMeasureSpec(resultSize, resultMode); 4322 } 4323 4324 4325 /** 4326 * Removes any pending animations for views that have been removed. Call 4327 * this if you don't want animations for exiting views to stack up. 4328 */ 4329 public void clearDisappearingChildren() { 4330 if (mDisappearingChildren != null) { 4331 mDisappearingChildren.clear(); 4332 } 4333 } 4334 4335 /** 4336 * Add a view which is removed from mChildren but still needs animation 4337 * 4338 * @param v View to add 4339 */ 4340 private void addDisappearingView(View v) { 4341 ArrayList<View> disappearingChildren = mDisappearingChildren; 4342 4343 if (disappearingChildren == null) { 4344 disappearingChildren = mDisappearingChildren = new ArrayList<View>(); 4345 } 4346 4347 disappearingChildren.add(v); 4348 } 4349 4350 /** 4351 * Cleanup a view when its animation is done. This may mean removing it from 4352 * the list of disappearing views. 4353 * 4354 * @param view The view whose animation has finished 4355 * @param animation The animation, cannot be null 4356 */ 4357 private void finishAnimatingView(final View view, Animation animation) { 4358 final ArrayList<View> disappearingChildren = mDisappearingChildren; 4359 if (disappearingChildren != null) { 4360 if (disappearingChildren.contains(view)) { 4361 disappearingChildren.remove(view); 4362 4363 if (view.mAttachInfo != null) { 4364 view.dispatchDetachedFromWindow(); 4365 } 4366 4367 view.clearAnimation(); 4368 mGroupFlags |= FLAG_INVALIDATE_REQUIRED; 4369 } 4370 } 4371 4372 if (animation != null && !animation.getFillAfter()) { 4373 view.clearAnimation(); 4374 } 4375 4376 if ((view.mPrivateFlags & ANIMATION_STARTED) == ANIMATION_STARTED) { 4377 view.onAnimationEnd(); 4378 // Should be performed by onAnimationEnd() but this avoid an infinite loop, 4379 // so we'd rather be safe than sorry 4380 view.mPrivateFlags &= ~ANIMATION_STARTED; 4381 // Draw one more frame after the animation is done 4382 mGroupFlags |= FLAG_INVALIDATE_REQUIRED; 4383 } 4384 } 4385 4386 /** 4387 * This method tells the ViewGroup that the given View object, which should have this 4388 * ViewGroup as its parent, 4389 * should be kept around (re-displayed when the ViewGroup draws its children) even if it 4390 * is removed from its parent. This allows animations, such as those used by 4391 * {@link android.app.Fragment} and {@link android.animation.LayoutTransition} to animate 4392 * the removal of views. A call to this method should always be accompanied by a later call 4393 * to {@link #endViewTransition(View)}, such as after an animation on the View has finished, 4394 * so that the View finally gets removed. 4395 * 4396 * @param view The View object to be kept visible even if it gets removed from its parent. 4397 */ 4398 public void startViewTransition(View view) { 4399 if (view.mParent == this) { 4400 if (mTransitioningViews == null) { 4401 mTransitioningViews = new ArrayList<View>(); 4402 } 4403 mTransitioningViews.add(view); 4404 } 4405 } 4406 4407 /** 4408 * This method should always be called following an earlier call to 4409 * {@link #startViewTransition(View)}. The given View is finally removed from its parent 4410 * and will no longer be displayed. Note that this method does not perform the functionality 4411 * of removing a view from its parent; it just discontinues the display of a View that 4412 * has previously been removed. 4413 * 4414 * @return view The View object that has been removed but is being kept around in the visible 4415 * hierarchy by an earlier call to {@link #startViewTransition(View)}. 4416 */ 4417 public void endViewTransition(View view) { 4418 if (mTransitioningViews != null) { 4419 mTransitioningViews.remove(view); 4420 final ArrayList<View> disappearingChildren = mDisappearingChildren; 4421 if (disappearingChildren != null && disappearingChildren.contains(view)) { 4422 disappearingChildren.remove(view); 4423 if (mVisibilityChangingChildren != null && 4424 mVisibilityChangingChildren.contains(view)) { 4425 mVisibilityChangingChildren.remove(view); 4426 } else { 4427 if (view.mAttachInfo != null) { 4428 view.dispatchDetachedFromWindow(); 4429 } 4430 if (view.mParent != null) { 4431 view.mParent = null; 4432 } 4433 } 4434 mGroupFlags |= FLAG_INVALIDATE_REQUIRED; 4435 } 4436 } 4437 } 4438 4439 private LayoutTransition.TransitionListener mLayoutTransitionListener = 4440 new LayoutTransition.TransitionListener() { 4441 @Override 4442 public void startTransition(LayoutTransition transition, ViewGroup container, 4443 View view, int transitionType) { 4444 // We only care about disappearing items, since we need special logic to keep 4445 // those items visible after they've been 'removed' 4446 if (transitionType == LayoutTransition.DISAPPEARING) { 4447 startViewTransition(view); 4448 } 4449 } 4450 4451 @Override 4452 public void endTransition(LayoutTransition transition, ViewGroup container, 4453 View view, int transitionType) { 4454 if (mLayoutSuppressed && !transition.isChangingLayout()) { 4455 requestLayout(); 4456 mLayoutSuppressed = false; 4457 } 4458 if (transitionType == LayoutTransition.DISAPPEARING && mTransitioningViews != null) { 4459 endViewTransition(view); 4460 } 4461 } 4462 }; 4463 4464 /** 4465 * {@inheritDoc} 4466 */ 4467 @Override 4468 public boolean gatherTransparentRegion(Region region) { 4469 // If no transparent regions requested, we are always opaque. 4470 final boolean meOpaque = (mPrivateFlags & View.REQUEST_TRANSPARENT_REGIONS) == 0; 4471 if (meOpaque && region == null) { 4472 // The caller doesn't care about the region, so stop now. 4473 return true; 4474 } 4475 super.gatherTransparentRegion(region); 4476 final View[] children = mChildren; 4477 final int count = mChildrenCount; 4478 boolean noneOfTheChildrenAreTransparent = true; 4479 for (int i = 0; i < count; i++) { 4480 final View child = children[i]; 4481 if ((child.mViewFlags & VISIBILITY_MASK) == VISIBLE || child.getAnimation() != null) { 4482 if (!child.gatherTransparentRegion(region)) { 4483 noneOfTheChildrenAreTransparent = false; 4484 } 4485 } 4486 } 4487 return meOpaque || noneOfTheChildrenAreTransparent; 4488 } 4489 4490 /** 4491 * {@inheritDoc} 4492 */ 4493 public void requestTransparentRegion(View child) { 4494 if (child != null) { 4495 child.mPrivateFlags |= View.REQUEST_TRANSPARENT_REGIONS; 4496 if (mParent != null) { 4497 mParent.requestTransparentRegion(this); 4498 } 4499 } 4500 } 4501 4502 4503 @Override 4504 protected boolean fitSystemWindows(Rect insets) { 4505 boolean done = super.fitSystemWindows(insets); 4506 if (!done) { 4507 final int count = mChildrenCount; 4508 final View[] children = mChildren; 4509 for (int i = 0; i < count; i++) { 4510 done = children[i].fitSystemWindows(insets); 4511 if (done) { 4512 break; 4513 } 4514 } 4515 } 4516 return done; 4517 } 4518 4519 /** 4520 * Returns the animation listener to which layout animation events are 4521 * sent. 4522 * 4523 * @return an {@link android.view.animation.Animation.AnimationListener} 4524 */ 4525 public Animation.AnimationListener getLayoutAnimationListener() { 4526 return mAnimationListener; 4527 } 4528 4529 @Override 4530 protected void drawableStateChanged() { 4531 super.drawableStateChanged(); 4532 4533 if ((mGroupFlags & FLAG_NOTIFY_CHILDREN_ON_DRAWABLE_STATE_CHANGE) != 0) { 4534 if ((mGroupFlags & FLAG_ADD_STATES_FROM_CHILDREN) != 0) { 4535 throw new IllegalStateException("addStateFromChildren cannot be enabled if a" 4536 + " child has duplicateParentState set to true"); 4537 } 4538 4539 final View[] children = mChildren; 4540 final int count = mChildrenCount; 4541 4542 for (int i = 0; i < count; i++) { 4543 final View child = children[i]; 4544 if ((child.mViewFlags & DUPLICATE_PARENT_STATE) != 0) { 4545 child.refreshDrawableState(); 4546 } 4547 } 4548 } 4549 } 4550 4551 @Override 4552 public void jumpDrawablesToCurrentState() { 4553 super.jumpDrawablesToCurrentState(); 4554 final View[] children = mChildren; 4555 final int count = mChildrenCount; 4556 for (int i = 0; i < count; i++) { 4557 children[i].jumpDrawablesToCurrentState(); 4558 } 4559 } 4560 4561 @Override 4562 protected int[] onCreateDrawableState(int extraSpace) { 4563 if ((mGroupFlags & FLAG_ADD_STATES_FROM_CHILDREN) == 0) { 4564 return super.onCreateDrawableState(extraSpace); 4565 } 4566 4567 int need = 0; 4568 int n = getChildCount(); 4569 for (int i = 0; i < n; i++) { 4570 int[] childState = getChildAt(i).getDrawableState(); 4571 4572 if (childState != null) { 4573 need += childState.length; 4574 } 4575 } 4576 4577 int[] state = super.onCreateDrawableState(extraSpace + need); 4578 4579 for (int i = 0; i < n; i++) { 4580 int[] childState = getChildAt(i).getDrawableState(); 4581 4582 if (childState != null) { 4583 state = mergeDrawableStates(state, childState); 4584 } 4585 } 4586 4587 return state; 4588 } 4589 4590 /** 4591 * Sets whether this ViewGroup's drawable states also include 4592 * its children's drawable states. This is used, for example, to 4593 * make a group appear to be focused when its child EditText or button 4594 * is focused. 4595 */ 4596 public void setAddStatesFromChildren(boolean addsStates) { 4597 if (addsStates) { 4598 mGroupFlags |= FLAG_ADD_STATES_FROM_CHILDREN; 4599 } else { 4600 mGroupFlags &= ~FLAG_ADD_STATES_FROM_CHILDREN; 4601 } 4602 4603 refreshDrawableState(); 4604 } 4605 4606 /** 4607 * Returns whether this ViewGroup's drawable states also include 4608 * its children's drawable states. This is used, for example, to 4609 * make a group appear to be focused when its child EditText or button 4610 * is focused. 4611 */ 4612 public boolean addStatesFromChildren() { 4613 return (mGroupFlags & FLAG_ADD_STATES_FROM_CHILDREN) != 0; 4614 } 4615 4616 /** 4617 * If {link #addStatesFromChildren} is true, refreshes this group's 4618 * drawable state (to include the states from its children). 4619 */ 4620 public void childDrawableStateChanged(View child) { 4621 if ((mGroupFlags & FLAG_ADD_STATES_FROM_CHILDREN) != 0) { 4622 refreshDrawableState(); 4623 } 4624 } 4625 4626 /** 4627 * Specifies the animation listener to which layout animation events must 4628 * be sent. Only 4629 * {@link android.view.animation.Animation.AnimationListener#onAnimationStart(Animation)} 4630 * and 4631 * {@link android.view.animation.Animation.AnimationListener#onAnimationEnd(Animation)} 4632 * are invoked. 4633 * 4634 * @param animationListener the layout animation listener 4635 */ 4636 public void setLayoutAnimationListener(Animation.AnimationListener animationListener) { 4637 mAnimationListener = animationListener; 4638 } 4639 4640 /** 4641 * LayoutParams are used by views to tell their parents how they want to be 4642 * laid out. See 4643 * {@link android.R.styleable#ViewGroup_Layout ViewGroup Layout Attributes} 4644 * for a list of all child view attributes that this class supports. 4645 * 4646 * <p> 4647 * The base LayoutParams class just describes how big the view wants to be 4648 * for both width and height. For each dimension, it can specify one of: 4649 * <ul> 4650 * <li>FILL_PARENT (renamed MATCH_PARENT in API Level 8 and higher), which 4651 * means that the view wants to be as big as its parent (minus padding) 4652 * <li> WRAP_CONTENT, which means that the view wants to be just big enough 4653 * to enclose its content (plus padding) 4654 * <li> an exact number 4655 * </ul> 4656 * There are subclasses of LayoutParams for different subclasses of 4657 * ViewGroup. For example, AbsoluteLayout has its own subclass of 4658 * LayoutParams which adds an X and Y value. 4659 * 4660 * @attr ref android.R.styleable#ViewGroup_Layout_layout_height 4661 * @attr ref android.R.styleable#ViewGroup_Layout_layout_width 4662 */ 4663 public static class LayoutParams { 4664 /** 4665 * Special value for the height or width requested by a View. 4666 * FILL_PARENT means that the view wants to be as big as its parent, 4667 * minus the parent's padding, if any. This value is deprecated 4668 * starting in API Level 8 and replaced by {@link #MATCH_PARENT}. 4669 */ 4670 @SuppressWarnings({"UnusedDeclaration"}) 4671 @Deprecated 4672 public static final int FILL_PARENT = -1; 4673 4674 /** 4675 * Special value for the height or width requested by a View. 4676 * MATCH_PARENT means that the view wants to be as big as its parent, 4677 * minus the parent's padding, if any. Introduced in API Level 8. 4678 */ 4679 public static final int MATCH_PARENT = -1; 4680 4681 /** 4682 * Special value for the height or width requested by a View. 4683 * WRAP_CONTENT means that the view wants to be just large enough to fit 4684 * its own internal content, taking its own padding into account. 4685 */ 4686 public static final int WRAP_CONTENT = -2; 4687 4688 /** 4689 * Information about how wide the view wants to be. Can be one of the 4690 * constants FILL_PARENT (replaced by MATCH_PARENT , 4691 * in API Level 8) or WRAP_CONTENT. or an exact size. 4692 */ 4693 @ViewDebug.ExportedProperty(category = "layout", mapping = { 4694 @ViewDebug.IntToString(from = MATCH_PARENT, to = "MATCH_PARENT"), 4695 @ViewDebug.IntToString(from = WRAP_CONTENT, to = "WRAP_CONTENT") 4696 }) 4697 public int width; 4698 4699 /** 4700 * Information about how tall the view wants to be. Can be one of the 4701 * constants FILL_PARENT (replaced by MATCH_PARENT , 4702 * in API Level 8) or WRAP_CONTENT. or an exact size. 4703 */ 4704 @ViewDebug.ExportedProperty(category = "layout", mapping = { 4705 @ViewDebug.IntToString(from = MATCH_PARENT, to = "MATCH_PARENT"), 4706 @ViewDebug.IntToString(from = WRAP_CONTENT, to = "WRAP_CONTENT") 4707 }) 4708 public int height; 4709 4710 /** 4711 * Used to animate layouts. 4712 */ 4713 public LayoutAnimationController.AnimationParameters layoutAnimationParameters; 4714 4715 /** 4716 * Creates a new set of layout parameters. The values are extracted from 4717 * the supplied attributes set and context. The XML attributes mapped 4718 * to this set of layout parameters are: 4719 * 4720 * <ul> 4721 * <li><code>layout_width</code>: the width, either an exact value, 4722 * {@link #WRAP_CONTENT}, or {@link #FILL_PARENT} (replaced by 4723 * {@link #MATCH_PARENT} in API Level 8)</li> 4724 * <li><code>layout_height</code>: the height, either an exact value, 4725 * {@link #WRAP_CONTENT}, or {@link #FILL_PARENT} (replaced by 4726 * {@link #MATCH_PARENT} in API Level 8)</li> 4727 * </ul> 4728 * 4729 * @param c the application environment 4730 * @param attrs the set of attributes from which to extract the layout 4731 * parameters' values 4732 */ 4733 public LayoutParams(Context c, AttributeSet attrs) { 4734 TypedArray a = c.obtainStyledAttributes(attrs, R.styleable.ViewGroup_Layout); 4735 setBaseAttributes(a, 4736 R.styleable.ViewGroup_Layout_layout_width, 4737 R.styleable.ViewGroup_Layout_layout_height); 4738 a.recycle(); 4739 } 4740 4741 /** 4742 * Creates a new set of layout parameters with the specified width 4743 * and height. 4744 * 4745 * @param width the width, either {@link #WRAP_CONTENT}, 4746 * {@link #FILL_PARENT} (replaced by {@link #MATCH_PARENT} in 4747 * API Level 8), or a fixed size in pixels 4748 * @param height the height, either {@link #WRAP_CONTENT}, 4749 * {@link #FILL_PARENT} (replaced by {@link #MATCH_PARENT} in 4750 * API Level 8), or a fixed size in pixels 4751 */ 4752 public LayoutParams(int width, int height) { 4753 this.width = width; 4754 this.height = height; 4755 } 4756 4757 /** 4758 * Copy constructor. Clones the width and height values of the source. 4759 * 4760 * @param source The layout params to copy from. 4761 */ 4762 public LayoutParams(LayoutParams source) { 4763 this.width = source.width; 4764 this.height = source.height; 4765 } 4766 4767 /** 4768 * Used internally by MarginLayoutParams. 4769 * @hide 4770 */ 4771 LayoutParams() { 4772 } 4773 4774 /** 4775 * Extracts the layout parameters from the supplied attributes. 4776 * 4777 * @param a the style attributes to extract the parameters from 4778 * @param widthAttr the identifier of the width attribute 4779 * @param heightAttr the identifier of the height attribute 4780 */ 4781 protected void setBaseAttributes(TypedArray a, int widthAttr, int heightAttr) { 4782 width = a.getLayoutDimension(widthAttr, "layout_width"); 4783 height = a.getLayoutDimension(heightAttr, "layout_height"); 4784 } 4785 4786 /** 4787 * Returns a String representation of this set of layout parameters. 4788 * 4789 * @param output the String to prepend to the internal representation 4790 * @return a String with the following format: output + 4791 * "ViewGroup.LayoutParams={ width=WIDTH, height=HEIGHT }" 4792 * 4793 * @hide 4794 */ 4795 public String debug(String output) { 4796 return output + "ViewGroup.LayoutParams={ width=" 4797 + sizeToString(width) + ", height=" + sizeToString(height) + " }"; 4798 } 4799 4800 /** 4801 * Converts the specified size to a readable String. 4802 * 4803 * @param size the size to convert 4804 * @return a String instance representing the supplied size 4805 * 4806 * @hide 4807 */ 4808 protected static String sizeToString(int size) { 4809 if (size == WRAP_CONTENT) { 4810 return "wrap-content"; 4811 } 4812 if (size == MATCH_PARENT) { 4813 return "match-parent"; 4814 } 4815 return String.valueOf(size); 4816 } 4817 } 4818 4819 /** 4820 * Per-child layout information for layouts that support margins. 4821 * See 4822 * {@link android.R.styleable#ViewGroup_MarginLayout ViewGroup Margin Layout Attributes} 4823 * for a list of all child view attributes that this class supports. 4824 */ 4825 public static class MarginLayoutParams extends ViewGroup.LayoutParams { 4826 /** 4827 * The left margin in pixels of the child. 4828 */ 4829 @ViewDebug.ExportedProperty(category = "layout") 4830 public int leftMargin; 4831 4832 /** 4833 * The top margin in pixels of the child. 4834 */ 4835 @ViewDebug.ExportedProperty(category = "layout") 4836 public int topMargin; 4837 4838 /** 4839 * The right margin in pixels of the child. 4840 */ 4841 @ViewDebug.ExportedProperty(category = "layout") 4842 public int rightMargin; 4843 4844 /** 4845 * The bottom margin in pixels of the child. 4846 */ 4847 @ViewDebug.ExportedProperty(category = "layout") 4848 public int bottomMargin; 4849 4850 /** 4851 * Creates a new set of layout parameters. The values are extracted from 4852 * the supplied attributes set and context. 4853 * 4854 * @param c the application environment 4855 * @param attrs the set of attributes from which to extract the layout 4856 * parameters' values 4857 */ 4858 public MarginLayoutParams(Context c, AttributeSet attrs) { 4859 super(); 4860 4861 TypedArray a = c.obtainStyledAttributes(attrs, R.styleable.ViewGroup_MarginLayout); 4862 setBaseAttributes(a, 4863 R.styleable.ViewGroup_MarginLayout_layout_width, 4864 R.styleable.ViewGroup_MarginLayout_layout_height); 4865 4866 int margin = a.getDimensionPixelSize( 4867 com.android.internal.R.styleable.ViewGroup_MarginLayout_layout_margin, -1); 4868 if (margin >= 0) { 4869 leftMargin = margin; 4870 topMargin = margin; 4871 rightMargin= margin; 4872 bottomMargin = margin; 4873 } else { 4874 leftMargin = a.getDimensionPixelSize( 4875 R.styleable.ViewGroup_MarginLayout_layout_marginLeft, 0); 4876 topMargin = a.getDimensionPixelSize( 4877 R.styleable.ViewGroup_MarginLayout_layout_marginTop, 0); 4878 rightMargin = a.getDimensionPixelSize( 4879 R.styleable.ViewGroup_MarginLayout_layout_marginRight, 0); 4880 bottomMargin = a.getDimensionPixelSize( 4881 R.styleable.ViewGroup_MarginLayout_layout_marginBottom, 0); 4882 } 4883 4884 a.recycle(); 4885 } 4886 4887 /** 4888 * {@inheritDoc} 4889 */ 4890 public MarginLayoutParams(int width, int height) { 4891 super(width, height); 4892 } 4893 4894 /** 4895 * Copy constructor. Clones the width, height and margin values of the source. 4896 * 4897 * @param source The layout params to copy from. 4898 */ 4899 public MarginLayoutParams(MarginLayoutParams source) { 4900 this.width = source.width; 4901 this.height = source.height; 4902 4903 this.leftMargin = source.leftMargin; 4904 this.topMargin = source.topMargin; 4905 this.rightMargin = source.rightMargin; 4906 this.bottomMargin = source.bottomMargin; 4907 } 4908 4909 /** 4910 * {@inheritDoc} 4911 */ 4912 public MarginLayoutParams(LayoutParams source) { 4913 super(source); 4914 } 4915 4916 /** 4917 * Sets the margins, in pixels. 4918 * 4919 * @param left the left margin size 4920 * @param top the top margin size 4921 * @param right the right margin size 4922 * @param bottom the bottom margin size 4923 * 4924 * @attr ref android.R.styleable#ViewGroup_MarginLayout_layout_marginLeft 4925 * @attr ref android.R.styleable#ViewGroup_MarginLayout_layout_marginTop 4926 * @attr ref android.R.styleable#ViewGroup_MarginLayout_layout_marginRight 4927 * @attr ref android.R.styleable#ViewGroup_MarginLayout_layout_marginBottom 4928 */ 4929 public void setMargins(int left, int top, int right, int bottom) { 4930 leftMargin = left; 4931 topMargin = top; 4932 rightMargin = right; 4933 bottomMargin = bottom; 4934 } 4935 } 4936 4937 /* Describes a touched view and the ids of the pointers that it has captured. 4938 * 4939 * This code assumes that pointer ids are always in the range 0..31 such that 4940 * it can use a bitfield to track which pointer ids are present. 4941 * As it happens, the lower layers of the input dispatch pipeline also use the 4942 * same trick so the assumption should be safe here... 4943 */ 4944 private static final class TouchTarget { 4945 private static final int MAX_RECYCLED = 32; 4946 private static final Object sRecycleLock = new Object(); 4947 private static TouchTarget sRecycleBin; 4948 private static int sRecycledCount; 4949 4950 public static final int ALL_POINTER_IDS = -1; // all ones 4951 4952 // The touched child view. 4953 public View child; 4954 4955 // The combined bit mask of pointer ids for all pointers captured by the target. 4956 public int pointerIdBits; 4957 4958 // The next target in the target list. 4959 public TouchTarget next; 4960 4961 private TouchTarget() { 4962 } 4963 4964 public static TouchTarget obtain(View child, int pointerIdBits) { 4965 final TouchTarget target; 4966 synchronized (sRecycleLock) { 4967 if (sRecycleBin == null) { 4968 target = new TouchTarget(); 4969 } else { 4970 target = sRecycleBin; 4971 sRecycleBin = target.next; 4972 sRecycledCount--; 4973 target.next = null; 4974 } 4975 } 4976 target.child = child; 4977 target.pointerIdBits = pointerIdBits; 4978 return target; 4979 } 4980 4981 public void recycle() { 4982 synchronized (sRecycleLock) { 4983 if (sRecycledCount < MAX_RECYCLED) { 4984 next = sRecycleBin; 4985 sRecycleBin = this; 4986 sRecycledCount += 1; 4987 } else { 4988 next = null; 4989 } 4990 child = null; 4991 } 4992 } 4993 } 4994} 4995