ViewGroup.java revision e965dee34135e7bce186408d1265a5cfd05a9fb1
1/* 2 * Copyright (C) 2006 The Android Open Source Project 3 * 4 * Licensed under the Apache License, Version 2.0 (the "License"); 5 * you may not use this file except in compliance with the License. 6 * You may obtain a copy of the License at 7 * 8 * http://www.apache.org/licenses/LICENSE-2.0 9 * 10 * Unless required by applicable law or agreed to in writing, software 11 * distributed under the License is distributed on an "AS IS" BASIS, 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 13 * See the License for the specific language governing permissions and 14 * limitations under the License. 15 */ 16 17package android.view; 18 19import android.animation.LayoutTransition; 20import com.android.internal.R; 21import com.android.internal.util.Predicate; 22 23import android.content.Context; 24import android.content.res.Configuration; 25import android.content.res.TypedArray; 26import android.graphics.Bitmap; 27import android.graphics.Canvas; 28import android.graphics.Matrix; 29import android.graphics.Paint; 30import android.graphics.PointF; 31import android.graphics.Rect; 32import android.graphics.RectF; 33import android.graphics.Region; 34import android.os.Build; 35import android.os.Parcelable; 36import android.os.SystemClock; 37import android.util.AttributeSet; 38import android.util.Log; 39import android.util.SparseArray; 40import android.view.accessibility.AccessibilityEvent; 41import android.view.animation.Animation; 42import android.view.animation.AnimationUtils; 43import android.view.animation.LayoutAnimationController; 44import android.view.animation.Transformation; 45 46import java.util.ArrayList; 47import java.util.HashSet; 48 49/** 50 * <p> 51 * A <code>ViewGroup</code> is a special view that can contain other views 52 * (called children.) The view group is the base class for layouts and views 53 * containers. This class also defines the 54 * {@link android.view.ViewGroup.LayoutParams} class which serves as the base 55 * class for layouts parameters. 56 * </p> 57 * 58 * <p> 59 * Also see {@link LayoutParams} for layout attributes. 60 * </p> 61 * 62 * @attr ref android.R.styleable#ViewGroup_clipChildren 63 * @attr ref android.R.styleable#ViewGroup_clipToPadding 64 * @attr ref android.R.styleable#ViewGroup_layoutAnimation 65 * @attr ref android.R.styleable#ViewGroup_animationCache 66 * @attr ref android.R.styleable#ViewGroup_persistentDrawingCache 67 * @attr ref android.R.styleable#ViewGroup_alwaysDrawnWithCache 68 * @attr ref android.R.styleable#ViewGroup_addStatesFromChildren 69 * @attr ref android.R.styleable#ViewGroup_descendantFocusability 70 * @attr ref android.R.styleable#ViewGroup_animateLayoutChanges 71 */ 72public abstract class ViewGroup extends View implements ViewParent, ViewManager { 73 74 private static final boolean DBG = false; 75 76 /** 77 * Views which have been hidden or removed which need to be animated on 78 * their way out. 79 * This field should be made private, so it is hidden from the SDK. 80 * {@hide} 81 */ 82 protected ArrayList<View> mDisappearingChildren; 83 84 /** 85 * Listener used to propagate events indicating when children are added 86 * and/or removed from a view group. 87 * This field should be made private, so it is hidden from the SDK. 88 * {@hide} 89 */ 90 protected OnHierarchyChangeListener mOnHierarchyChangeListener; 91 92 // The view contained within this ViewGroup that has or contains focus. 93 private View mFocused; 94 95 /** 96 * A Transformation used when drawing children, to 97 * apply on the child being drawn. 98 */ 99 private final Transformation mChildTransformation = new Transformation(); 100 101 /** 102 * Used to track the current invalidation region. 103 */ 104 private RectF mInvalidateRegion; 105 106 /** 107 * A Transformation used to calculate a correct 108 * invalidation area when the application is autoscaled. 109 */ 110 private Transformation mInvalidationTransformation; 111 112 // View currently under an ongoing drag 113 private View mCurrentDragView; 114 115 // Metadata about the ongoing drag 116 private DragEvent mCurrentDrag; 117 private HashSet<View> mDragNotifiedChildren; 118 119 // Does this group have a child that can accept the current drag payload? 120 private boolean mChildAcceptsDrag; 121 122 // Used during drag dispatch 123 private final PointF mLocalPoint = new PointF(); 124 125 // Layout animation 126 private LayoutAnimationController mLayoutAnimationController; 127 private Animation.AnimationListener mAnimationListener; 128 129 // First touch target in the linked list of touch targets. 130 private TouchTarget mFirstTouchTarget; 131 132 // Temporary arrays for splitting pointers. 133 private int[] mTmpPointerIndexMap; 134 private int[] mTmpPointerIds; 135 private MotionEvent.PointerCoords[] mTmpPointerCoords; 136 137 // For debugging only. You can see these in hierarchyviewer. 138 @SuppressWarnings({"FieldCanBeLocal", "UnusedDeclaration"}) 139 @ViewDebug.ExportedProperty(category = "events") 140 private long mLastTouchDownTime; 141 @ViewDebug.ExportedProperty(category = "events") 142 private int mLastTouchDownIndex = -1; 143 @SuppressWarnings({"FieldCanBeLocal", "UnusedDeclaration"}) 144 @ViewDebug.ExportedProperty(category = "events") 145 private float mLastTouchDownX; 146 @SuppressWarnings({"FieldCanBeLocal", "UnusedDeclaration"}) 147 @ViewDebug.ExportedProperty(category = "events") 148 private float mLastTouchDownY; 149 150 /** 151 * Internal flags. 152 * 153 * This field should be made private, so it is hidden from the SDK. 154 * {@hide} 155 */ 156 protected int mGroupFlags; 157 158 // When set, ViewGroup invalidates only the child's rectangle 159 // Set by default 160 private static final int FLAG_CLIP_CHILDREN = 0x1; 161 162 // When set, ViewGroup excludes the padding area from the invalidate rectangle 163 // Set by default 164 private static final int FLAG_CLIP_TO_PADDING = 0x2; 165 166 // When set, dispatchDraw() will invoke invalidate(); this is set by drawChild() when 167 // a child needs to be invalidated and FLAG_OPTIMIZE_INVALIDATE is set 168 private static final int FLAG_INVALIDATE_REQUIRED = 0x4; 169 170 // When set, dispatchDraw() will run the layout animation and unset the flag 171 private static final int FLAG_RUN_ANIMATION = 0x8; 172 173 // When set, there is either no layout animation on the ViewGroup or the layout 174 // animation is over 175 // Set by default 176 private static final int FLAG_ANIMATION_DONE = 0x10; 177 178 // If set, this ViewGroup has padding; if unset there is no padding and we don't need 179 // to clip it, even if FLAG_CLIP_TO_PADDING is set 180 private static final int FLAG_PADDING_NOT_NULL = 0x20; 181 182 // When set, this ViewGroup caches its children in a Bitmap before starting a layout animation 183 // Set by default 184 private static final int FLAG_ANIMATION_CACHE = 0x40; 185 186 // When set, this ViewGroup converts calls to invalidate(Rect) to invalidate() during a 187 // layout animation; this avoid clobbering the hierarchy 188 // Automatically set when the layout animation starts, depending on the animation's 189 // characteristics 190 private static final int FLAG_OPTIMIZE_INVALIDATE = 0x80; 191 192 // When set, the next call to drawChild() will clear mChildTransformation's matrix 193 private static final int FLAG_CLEAR_TRANSFORMATION = 0x100; 194 195 // When set, this ViewGroup invokes mAnimationListener.onAnimationEnd() and removes 196 // the children's Bitmap caches if necessary 197 // This flag is set when the layout animation is over (after FLAG_ANIMATION_DONE is set) 198 private static final int FLAG_NOTIFY_ANIMATION_LISTENER = 0x200; 199 200 /** 201 * When set, the drawing method will call {@link #getChildDrawingOrder(int, int)} 202 * to get the index of the child to draw for that iteration. 203 * 204 * @hide 205 */ 206 protected static final int FLAG_USE_CHILD_DRAWING_ORDER = 0x400; 207 208 /** 209 * When set, this ViewGroup supports static transformations on children; this causes 210 * {@link #getChildStaticTransformation(View, android.view.animation.Transformation)} to be 211 * invoked when a child is drawn. 212 * 213 * Any subclass overriding 214 * {@link #getChildStaticTransformation(View, android.view.animation.Transformation)} should 215 * set this flags in {@link #mGroupFlags}. 216 * 217 * {@hide} 218 */ 219 protected static final int FLAG_SUPPORT_STATIC_TRANSFORMATIONS = 0x800; 220 221 // When the previous drawChild() invocation used an alpha value that was lower than 222 // 1.0 and set it in mCachePaint 223 private static final int FLAG_ALPHA_LOWER_THAN_ONE = 0x1000; 224 225 /** 226 * When set, this ViewGroup's drawable states also include those 227 * of its children. 228 */ 229 private static final int FLAG_ADD_STATES_FROM_CHILDREN = 0x2000; 230 231 /** 232 * When set, this ViewGroup tries to always draw its children using their drawing cache. 233 */ 234 private static final int FLAG_ALWAYS_DRAWN_WITH_CACHE = 0x4000; 235 236 /** 237 * When set, and if FLAG_ALWAYS_DRAWN_WITH_CACHE is not set, this ViewGroup will try to 238 * draw its children with their drawing cache. 239 */ 240 private static final int FLAG_CHILDREN_DRAWN_WITH_CACHE = 0x8000; 241 242 /** 243 * When set, this group will go through its list of children to notify them of 244 * any drawable state change. 245 */ 246 private static final int FLAG_NOTIFY_CHILDREN_ON_DRAWABLE_STATE_CHANGE = 0x10000; 247 248 private static final int FLAG_MASK_FOCUSABILITY = 0x60000; 249 250 /** 251 * This view will get focus before any of its descendants. 252 */ 253 public static final int FOCUS_BEFORE_DESCENDANTS = 0x20000; 254 255 /** 256 * This view will get focus only if none of its descendants want it. 257 */ 258 public static final int FOCUS_AFTER_DESCENDANTS = 0x40000; 259 260 /** 261 * This view will block any of its descendants from getting focus, even 262 * if they are focusable. 263 */ 264 public static final int FOCUS_BLOCK_DESCENDANTS = 0x60000; 265 266 /** 267 * Used to map between enum in attrubutes and flag values. 268 */ 269 private static final int[] DESCENDANT_FOCUSABILITY_FLAGS = 270 {FOCUS_BEFORE_DESCENDANTS, FOCUS_AFTER_DESCENDANTS, 271 FOCUS_BLOCK_DESCENDANTS}; 272 273 /** 274 * When set, this ViewGroup should not intercept touch events. 275 * {@hide} 276 */ 277 protected static final int FLAG_DISALLOW_INTERCEPT = 0x80000; 278 279 /** 280 * When set, this ViewGroup will split MotionEvents to multiple child Views when appropriate. 281 */ 282 private static final int FLAG_SPLIT_MOTION_EVENTS = 0x200000; 283 284 /** 285 * Indicates which types of drawing caches are to be kept in memory. 286 * This field should be made private, so it is hidden from the SDK. 287 * {@hide} 288 */ 289 protected int mPersistentDrawingCache; 290 291 /** 292 * Used to indicate that no drawing cache should be kept in memory. 293 */ 294 public static final int PERSISTENT_NO_CACHE = 0x0; 295 296 /** 297 * Used to indicate that the animation drawing cache should be kept in memory. 298 */ 299 public static final int PERSISTENT_ANIMATION_CACHE = 0x1; 300 301 /** 302 * Used to indicate that the scrolling drawing cache should be kept in memory. 303 */ 304 public static final int PERSISTENT_SCROLLING_CACHE = 0x2; 305 306 /** 307 * Used to indicate that all drawing caches should be kept in memory. 308 */ 309 public static final int PERSISTENT_ALL_CACHES = 0x3; 310 311 /** 312 * We clip to padding when FLAG_CLIP_TO_PADDING and FLAG_PADDING_NOT_NULL 313 * are set at the same time. 314 */ 315 protected static final int CLIP_TO_PADDING_MASK = FLAG_CLIP_TO_PADDING | FLAG_PADDING_NOT_NULL; 316 317 // Index of the child's left position in the mLocation array 318 private static final int CHILD_LEFT_INDEX = 0; 319 // Index of the child's top position in the mLocation array 320 private static final int CHILD_TOP_INDEX = 1; 321 322 // Child views of this ViewGroup 323 private View[] mChildren; 324 // Number of valid children in the mChildren array, the rest should be null or not 325 // considered as children 326 327 private boolean mLayoutSuppressed = false; 328 329 private int mChildrenCount; 330 331 private static final int ARRAY_INITIAL_CAPACITY = 12; 332 private static final int ARRAY_CAPACITY_INCREMENT = 12; 333 334 // Used to draw cached views 335 private final Paint mCachePaint = new Paint(); 336 337 // Used to animate add/remove changes in layout 338 private LayoutTransition mTransition; 339 340 // The set of views that are currently being transitioned. This list is used to track views 341 // being removed that should not actually be removed from the parent yet because they are 342 // being animated. 343 private ArrayList<View> mTransitioningViews; 344 345 // List of children changing visibility. This is used to potentially keep rendering 346 // views during a transition when they otherwise would have become gone/invisible 347 private ArrayList<View> mVisibilityChangingChildren; 348 349 public ViewGroup(Context context) { 350 super(context); 351 initViewGroup(); 352 } 353 354 public ViewGroup(Context context, AttributeSet attrs) { 355 super(context, attrs); 356 initViewGroup(); 357 initFromAttributes(context, attrs); 358 } 359 360 public ViewGroup(Context context, AttributeSet attrs, int defStyle) { 361 super(context, attrs, defStyle); 362 initViewGroup(); 363 initFromAttributes(context, attrs); 364 } 365 366 private void initViewGroup() { 367 // ViewGroup doesn't draw by default 368 setFlags(WILL_NOT_DRAW, DRAW_MASK); 369 mGroupFlags |= FLAG_CLIP_CHILDREN; 370 mGroupFlags |= FLAG_CLIP_TO_PADDING; 371 mGroupFlags |= FLAG_ANIMATION_DONE; 372 mGroupFlags |= FLAG_ANIMATION_CACHE; 373 mGroupFlags |= FLAG_ALWAYS_DRAWN_WITH_CACHE; 374 375 if (mContext.getApplicationInfo().targetSdkVersion >= Build.VERSION_CODES.HONEYCOMB) { 376 mGroupFlags |= FLAG_SPLIT_MOTION_EVENTS; 377 } 378 379 setDescendantFocusability(FOCUS_BEFORE_DESCENDANTS); 380 381 mChildren = new View[ARRAY_INITIAL_CAPACITY]; 382 mChildrenCount = 0; 383 384 mCachePaint.setDither(false); 385 386 mPersistentDrawingCache = PERSISTENT_SCROLLING_CACHE; 387 } 388 389 private void initFromAttributes(Context context, AttributeSet attrs) { 390 TypedArray a = context.obtainStyledAttributes(attrs, 391 R.styleable.ViewGroup); 392 393 final int N = a.getIndexCount(); 394 for (int i = 0; i < N; i++) { 395 int attr = a.getIndex(i); 396 switch (attr) { 397 case R.styleable.ViewGroup_clipChildren: 398 setClipChildren(a.getBoolean(attr, true)); 399 break; 400 case R.styleable.ViewGroup_clipToPadding: 401 setClipToPadding(a.getBoolean(attr, true)); 402 break; 403 case R.styleable.ViewGroup_animationCache: 404 setAnimationCacheEnabled(a.getBoolean(attr, true)); 405 break; 406 case R.styleable.ViewGroup_persistentDrawingCache: 407 setPersistentDrawingCache(a.getInt(attr, PERSISTENT_SCROLLING_CACHE)); 408 break; 409 case R.styleable.ViewGroup_addStatesFromChildren: 410 setAddStatesFromChildren(a.getBoolean(attr, false)); 411 break; 412 case R.styleable.ViewGroup_alwaysDrawnWithCache: 413 setAlwaysDrawnWithCacheEnabled(a.getBoolean(attr, true)); 414 break; 415 case R.styleable.ViewGroup_layoutAnimation: 416 int id = a.getResourceId(attr, -1); 417 if (id > 0) { 418 setLayoutAnimation(AnimationUtils.loadLayoutAnimation(mContext, id)); 419 } 420 break; 421 case R.styleable.ViewGroup_descendantFocusability: 422 setDescendantFocusability(DESCENDANT_FOCUSABILITY_FLAGS[a.getInt(attr, 0)]); 423 break; 424 case R.styleable.ViewGroup_splitMotionEvents: 425 setMotionEventSplittingEnabled(a.getBoolean(attr, false)); 426 break; 427 case R.styleable.ViewGroup_animateLayoutChanges: 428 boolean animateLayoutChanges = a.getBoolean(attr, false); 429 if (animateLayoutChanges) { 430 setLayoutTransition(new LayoutTransition()); 431 } 432 break; 433 } 434 } 435 436 a.recycle(); 437 } 438 439 /** 440 * Gets the descendant focusability of this view group. The descendant 441 * focusability defines the relationship between this view group and its 442 * descendants when looking for a view to take focus in 443 * {@link #requestFocus(int, android.graphics.Rect)}. 444 * 445 * @return one of {@link #FOCUS_BEFORE_DESCENDANTS}, {@link #FOCUS_AFTER_DESCENDANTS}, 446 * {@link #FOCUS_BLOCK_DESCENDANTS}. 447 */ 448 @ViewDebug.ExportedProperty(category = "focus", mapping = { 449 @ViewDebug.IntToString(from = FOCUS_BEFORE_DESCENDANTS, to = "FOCUS_BEFORE_DESCENDANTS"), 450 @ViewDebug.IntToString(from = FOCUS_AFTER_DESCENDANTS, to = "FOCUS_AFTER_DESCENDANTS"), 451 @ViewDebug.IntToString(from = FOCUS_BLOCK_DESCENDANTS, to = "FOCUS_BLOCK_DESCENDANTS") 452 }) 453 public int getDescendantFocusability() { 454 return mGroupFlags & FLAG_MASK_FOCUSABILITY; 455 } 456 457 /** 458 * Set the descendant focusability of this view group. This defines the relationship 459 * between this view group and its descendants when looking for a view to 460 * take focus in {@link #requestFocus(int, android.graphics.Rect)}. 461 * 462 * @param focusability one of {@link #FOCUS_BEFORE_DESCENDANTS}, {@link #FOCUS_AFTER_DESCENDANTS}, 463 * {@link #FOCUS_BLOCK_DESCENDANTS}. 464 */ 465 public void setDescendantFocusability(int focusability) { 466 switch (focusability) { 467 case FOCUS_BEFORE_DESCENDANTS: 468 case FOCUS_AFTER_DESCENDANTS: 469 case FOCUS_BLOCK_DESCENDANTS: 470 break; 471 default: 472 throw new IllegalArgumentException("must be one of FOCUS_BEFORE_DESCENDANTS, " 473 + "FOCUS_AFTER_DESCENDANTS, FOCUS_BLOCK_DESCENDANTS"); 474 } 475 mGroupFlags &= ~FLAG_MASK_FOCUSABILITY; 476 mGroupFlags |= (focusability & FLAG_MASK_FOCUSABILITY); 477 } 478 479 /** 480 * {@inheritDoc} 481 */ 482 @Override 483 void handleFocusGainInternal(int direction, Rect previouslyFocusedRect) { 484 if (mFocused != null) { 485 mFocused.unFocus(); 486 mFocused = null; 487 } 488 super.handleFocusGainInternal(direction, previouslyFocusedRect); 489 } 490 491 /** 492 * {@inheritDoc} 493 */ 494 public void requestChildFocus(View child, View focused) { 495 if (DBG) { 496 System.out.println(this + " requestChildFocus()"); 497 } 498 if (getDescendantFocusability() == FOCUS_BLOCK_DESCENDANTS) { 499 return; 500 } 501 502 // Unfocus us, if necessary 503 super.unFocus(); 504 505 // We had a previous notion of who had focus. Clear it. 506 if (mFocused != child) { 507 if (mFocused != null) { 508 mFocused.unFocus(); 509 } 510 511 mFocused = child; 512 } 513 if (mParent != null) { 514 mParent.requestChildFocus(this, focused); 515 } 516 } 517 518 /** 519 * {@inheritDoc} 520 */ 521 public void focusableViewAvailable(View v) { 522 if (mParent != null 523 // shortcut: don't report a new focusable view if we block our descendants from 524 // getting focus 525 && (getDescendantFocusability() != FOCUS_BLOCK_DESCENDANTS) 526 // shortcut: don't report a new focusable view if we already are focused 527 // (and we don't prefer our descendants) 528 // 529 // note: knowing that mFocused is non-null is not a good enough reason 530 // to break the traversal since in that case we'd actually have to find 531 // the focused view and make sure it wasn't FOCUS_AFTER_DESCENDANTS and 532 // an ancestor of v; this will get checked for at ViewRoot 533 && !(isFocused() && getDescendantFocusability() != FOCUS_AFTER_DESCENDANTS)) { 534 mParent.focusableViewAvailable(v); 535 } 536 } 537 538 /** 539 * {@inheritDoc} 540 */ 541 public boolean showContextMenuForChild(View originalView) { 542 return mParent != null && mParent.showContextMenuForChild(originalView); 543 } 544 545 /** 546 * {@inheritDoc} 547 */ 548 public ActionMode startActionModeForChild(View originalView, ActionMode.Callback callback) { 549 return mParent != null ? mParent.startActionModeForChild(originalView, callback) : null; 550 } 551 552 /** 553 * Find the nearest view in the specified direction that wants to take 554 * focus. 555 * 556 * @param focused The view that currently has focus 557 * @param direction One of FOCUS_UP, FOCUS_DOWN, FOCUS_LEFT, and 558 * FOCUS_RIGHT, or 0 for not applicable. 559 */ 560 public View focusSearch(View focused, int direction) { 561 if (isRootNamespace()) { 562 // root namespace means we should consider ourselves the top of the 563 // tree for focus searching; otherwise we could be focus searching 564 // into other tabs. see LocalActivityManager and TabHost for more info 565 return FocusFinder.getInstance().findNextFocus(this, focused, direction); 566 } else if (mParent != null) { 567 return mParent.focusSearch(focused, direction); 568 } 569 return null; 570 } 571 572 /** 573 * {@inheritDoc} 574 */ 575 public boolean requestChildRectangleOnScreen(View child, Rect rectangle, boolean immediate) { 576 return false; 577 } 578 579 /** 580 * {@inheritDoc} 581 */ 582 @Override 583 public boolean dispatchUnhandledMove(View focused, int direction) { 584 return mFocused != null && 585 mFocused.dispatchUnhandledMove(focused, direction); 586 } 587 588 /** 589 * {@inheritDoc} 590 */ 591 public void clearChildFocus(View child) { 592 if (DBG) { 593 System.out.println(this + " clearChildFocus()"); 594 } 595 596 mFocused = null; 597 if (mParent != null) { 598 mParent.clearChildFocus(this); 599 } 600 } 601 602 /** 603 * {@inheritDoc} 604 */ 605 @Override 606 public void clearFocus() { 607 super.clearFocus(); 608 609 // clear any child focus if it exists 610 if (mFocused != null) { 611 mFocused.clearFocus(); 612 } 613 } 614 615 /** 616 * {@inheritDoc} 617 */ 618 @Override 619 void unFocus() { 620 if (DBG) { 621 System.out.println(this + " unFocus()"); 622 } 623 624 super.unFocus(); 625 if (mFocused != null) { 626 mFocused.unFocus(); 627 } 628 mFocused = null; 629 } 630 631 /** 632 * Returns the focused child of this view, if any. The child may have focus 633 * or contain focus. 634 * 635 * @return the focused child or null. 636 */ 637 public View getFocusedChild() { 638 return mFocused; 639 } 640 641 /** 642 * Returns true if this view has or contains focus 643 * 644 * @return true if this view has or contains focus 645 */ 646 @Override 647 public boolean hasFocus() { 648 return (mPrivateFlags & FOCUSED) != 0 || mFocused != null; 649 } 650 651 /* 652 * (non-Javadoc) 653 * 654 * @see android.view.View#findFocus() 655 */ 656 @Override 657 public View findFocus() { 658 if (DBG) { 659 System.out.println("Find focus in " + this + ": flags=" 660 + isFocused() + ", child=" + mFocused); 661 } 662 663 if (isFocused()) { 664 return this; 665 } 666 667 if (mFocused != null) { 668 return mFocused.findFocus(); 669 } 670 return null; 671 } 672 673 /** 674 * {@inheritDoc} 675 */ 676 @Override 677 public boolean hasFocusable() { 678 if ((mViewFlags & VISIBILITY_MASK) != VISIBLE) { 679 return false; 680 } 681 682 if (isFocusable()) { 683 return true; 684 } 685 686 final int descendantFocusability = getDescendantFocusability(); 687 if (descendantFocusability != FOCUS_BLOCK_DESCENDANTS) { 688 final int count = mChildrenCount; 689 final View[] children = mChildren; 690 691 for (int i = 0; i < count; i++) { 692 final View child = children[i]; 693 if (child.hasFocusable()) { 694 return true; 695 } 696 } 697 } 698 699 return false; 700 } 701 702 /** 703 * {@inheritDoc} 704 */ 705 @Override 706 public void addFocusables(ArrayList<View> views, int direction) { 707 addFocusables(views, direction, FOCUSABLES_TOUCH_MODE); 708 } 709 710 /** 711 * {@inheritDoc} 712 */ 713 @Override 714 public void addFocusables(ArrayList<View> views, int direction, int focusableMode) { 715 final int focusableCount = views.size(); 716 717 final int descendantFocusability = getDescendantFocusability(); 718 719 if (descendantFocusability != FOCUS_BLOCK_DESCENDANTS) { 720 final int count = mChildrenCount; 721 final View[] children = mChildren; 722 723 for (int i = 0; i < count; i++) { 724 final View child = children[i]; 725 if ((child.mViewFlags & VISIBILITY_MASK) == VISIBLE) { 726 child.addFocusables(views, direction, focusableMode); 727 } 728 } 729 } 730 731 // we add ourselves (if focusable) in all cases except for when we are 732 // FOCUS_AFTER_DESCENDANTS and there are some descendants focusable. this is 733 // to avoid the focus search finding layouts when a more precise search 734 // among the focusable children would be more interesting. 735 if ( 736 descendantFocusability != FOCUS_AFTER_DESCENDANTS || 737 // No focusable descendants 738 (focusableCount == views.size())) { 739 super.addFocusables(views, direction, focusableMode); 740 } 741 } 742 743 /** 744 * {@inheritDoc} 745 */ 746 @Override 747 public void dispatchWindowFocusChanged(boolean hasFocus) { 748 super.dispatchWindowFocusChanged(hasFocus); 749 final int count = mChildrenCount; 750 final View[] children = mChildren; 751 for (int i = 0; i < count; i++) { 752 children[i].dispatchWindowFocusChanged(hasFocus); 753 } 754 } 755 756 /** 757 * {@inheritDoc} 758 */ 759 @Override 760 public void addTouchables(ArrayList<View> views) { 761 super.addTouchables(views); 762 763 final int count = mChildrenCount; 764 final View[] children = mChildren; 765 766 for (int i = 0; i < count; i++) { 767 final View child = children[i]; 768 if ((child.mViewFlags & VISIBILITY_MASK) == VISIBLE) { 769 child.addTouchables(views); 770 } 771 } 772 } 773 774 /** 775 * {@inheritDoc} 776 */ 777 @Override 778 public void dispatchDisplayHint(int hint) { 779 super.dispatchDisplayHint(hint); 780 final int count = mChildrenCount; 781 final View[] children = mChildren; 782 for (int i = 0; i < count; i++) { 783 children[i].dispatchDisplayHint(hint); 784 } 785 } 786 787 /** 788 * @hide 789 * @param child 790 * @param visibility 791 */ 792 void onChildVisibilityChanged(View child, int visibility) { 793 if (mTransition != null) { 794 if (visibility == VISIBLE) { 795 mTransition.showChild(this, child); 796 } else { 797 mTransition.hideChild(this, child); 798 } 799 if (visibility != VISIBLE) { 800 // Only track this on disappearing views - appearing views are already visible 801 // and don't need special handling during drawChild() 802 if (mVisibilityChangingChildren == null) { 803 mVisibilityChangingChildren = new ArrayList<View>(); 804 } 805 mVisibilityChangingChildren.add(child); 806 if (mTransitioningViews != null && mTransitioningViews.contains(child)) { 807 addDisappearingView(child); 808 } 809 } 810 } 811 812 // in all cases, for drags 813 if (mCurrentDrag != null) { 814 if (visibility == VISIBLE) { 815 notifyChildOfDrag(child); 816 } 817 } 818 } 819 820 /** 821 * {@inheritDoc} 822 */ 823 @Override 824 protected void dispatchVisibilityChanged(View changedView, int visibility) { 825 super.dispatchVisibilityChanged(changedView, visibility); 826 final int count = mChildrenCount; 827 final View[] children = mChildren; 828 for (int i = 0; i < count; i++) { 829 children[i].dispatchVisibilityChanged(changedView, visibility); 830 } 831 } 832 833 /** 834 * {@inheritDoc} 835 */ 836 @Override 837 public void dispatchWindowVisibilityChanged(int visibility) { 838 super.dispatchWindowVisibilityChanged(visibility); 839 final int count = mChildrenCount; 840 final View[] children = mChildren; 841 for (int i = 0; i < count; i++) { 842 children[i].dispatchWindowVisibilityChanged(visibility); 843 } 844 } 845 846 /** 847 * {@inheritDoc} 848 */ 849 @Override 850 public void dispatchConfigurationChanged(Configuration newConfig) { 851 super.dispatchConfigurationChanged(newConfig); 852 final int count = mChildrenCount; 853 final View[] children = mChildren; 854 for (int i = 0; i < count; i++) { 855 children[i].dispatchConfigurationChanged(newConfig); 856 } 857 } 858 859 /** 860 * {@inheritDoc} 861 */ 862 public void recomputeViewAttributes(View child) { 863 if (mAttachInfo != null && !mAttachInfo.mRecomputeGlobalAttributes) { 864 ViewParent parent = mParent; 865 if (parent != null) parent.recomputeViewAttributes(this); 866 } 867 } 868 869 @Override 870 void dispatchCollectViewAttributes(int visibility) { 871 visibility |= mViewFlags&VISIBILITY_MASK; 872 super.dispatchCollectViewAttributes(visibility); 873 final int count = mChildrenCount; 874 final View[] children = mChildren; 875 for (int i = 0; i < count; i++) { 876 children[i].dispatchCollectViewAttributes(visibility); 877 } 878 } 879 880 /** 881 * {@inheritDoc} 882 */ 883 public void bringChildToFront(View child) { 884 int index = indexOfChild(child); 885 if (index >= 0) { 886 removeFromArray(index); 887 addInArray(child, mChildrenCount); 888 child.mParent = this; 889 } 890 } 891 892 /** 893 * {@inheritDoc} 894 * 895 * !!! TODO: write real docs 896 */ 897 @Override 898 public boolean dispatchDragEvent(DragEvent event) { 899 boolean retval = false; 900 final float tx = event.mX; 901 final float ty = event.mY; 902 903 ViewRoot root = getViewRoot(); 904 905 // Dispatch down the view hierarchy 906 switch (event.mAction) { 907 case DragEvent.ACTION_DRAG_STARTED: { 908 // clear state to recalculate which views we drag over 909 mCurrentDragView = null; 910 911 // Set up our tracking of drag-started notifications 912 mCurrentDrag = DragEvent.obtain(event); 913 if (mDragNotifiedChildren == null) { 914 mDragNotifiedChildren = new HashSet<View>(); 915 } else { 916 mDragNotifiedChildren.clear(); 917 } 918 919 // Now dispatch down to our children, caching the responses 920 mChildAcceptsDrag = false; 921 final int count = mChildrenCount; 922 final View[] children = mChildren; 923 for (int i = 0; i < count; i++) { 924 final View child = children[i]; 925 if (child.getVisibility() == VISIBLE) { 926 final boolean handled = notifyChildOfDrag(children[i]); 927 if (handled) { 928 mChildAcceptsDrag = true; 929 } 930 } 931 } 932 933 // Return HANDLED if one of our children can accept the drag 934 if (mChildAcceptsDrag) { 935 retval = true; 936 } 937 } break; 938 939 case DragEvent.ACTION_DRAG_ENDED: { 940 // Release the bookkeeping now that the drag lifecycle has ended 941 if (mDragNotifiedChildren != null) { 942 for (View child : mDragNotifiedChildren) { 943 // If a child was notified about an ongoing drag, it's told that it's over 944 child.dispatchDragEvent(event); 945 } 946 947 mDragNotifiedChildren.clear(); 948 mCurrentDrag.recycle(); 949 mCurrentDrag = null; 950 } 951 952 // We consider drag-ended to have been handled if one of our children 953 // had offered to handle the drag. 954 if (mChildAcceptsDrag) { 955 retval = true; 956 } 957 } break; 958 959 case DragEvent.ACTION_DRAG_LOCATION: { 960 // Find the [possibly new] drag target 961 final View target = findFrontmostDroppableChildAt(event.mX, event.mY, mLocalPoint); 962 963 // If we've changed apparent drag target, tell the view root which view 964 // we're over now [for purposes of the eventual drag-recipient-changed 965 // notifications to the framework] and tell the new target that the drag 966 // has entered its bounds. The root will see setDragFocus() calls all 967 // the way down to the final leaf view that is handling the LOCATION event 968 // before reporting the new potential recipient to the framework. 969 if (mCurrentDragView != target) { 970 root.setDragFocus(target); 971 972 final int action = event.mAction; 973 // If we've dragged off of a child view, send it the EXITED message 974 if (mCurrentDragView != null) { 975 event.mAction = DragEvent.ACTION_DRAG_EXITED; 976 mCurrentDragView.dispatchDragEvent(event); 977 } 978 mCurrentDragView = target; 979 980 // If we've dragged over a new child view, send it the ENTERED message 981 if (target != null) { 982 event.mAction = DragEvent.ACTION_DRAG_ENTERED; 983 target.dispatchDragEvent(event); 984 } 985 event.mAction = action; // restore the event's original state 986 } 987 988 // Dispatch the actual drag location notice, localized into its coordinates 989 if (target != null) { 990 event.mX = mLocalPoint.x; 991 event.mY = mLocalPoint.y; 992 993 retval = target.dispatchDragEvent(event); 994 995 event.mX = tx; 996 event.mY = ty; 997 } 998 } break; 999 1000 /* Entered / exited dispatch 1001 * 1002 * DRAG_ENTERED is not dispatched downwards from ViewGroup. The reason for this is 1003 * that we're about to get the corresponding LOCATION event, which we will use to 1004 * determine which of our children is the new target; at that point we will 1005 * push a DRAG_ENTERED down to the new target child [which may itself be a ViewGroup]. 1006 * 1007 * DRAG_EXITED *is* dispatched all the way down immediately: once we know the 1008 * drag has left this ViewGroup, we know by definition that every contained subview 1009 * is also no longer under the drag point. 1010 */ 1011 1012 case DragEvent.ACTION_DRAG_EXITED: { 1013 if (mCurrentDragView != null) { 1014 mCurrentDragView.dispatchDragEvent(event); 1015 mCurrentDragView = null; 1016 } 1017 } break; 1018 1019 case DragEvent.ACTION_DROP: { 1020 if (ViewDebug.DEBUG_DRAG) Log.d(View.VIEW_LOG_TAG, "Drop event: " + event); 1021 View target = findFrontmostDroppableChildAt(event.mX, event.mY, mLocalPoint); 1022 if (target != null) { 1023 if (ViewDebug.DEBUG_DRAG) Log.d(View.VIEW_LOG_TAG, " dispatch drop to " + target); 1024 event.mX = mLocalPoint.x; 1025 event.mY = mLocalPoint.y; 1026 retval = target.dispatchDragEvent(event); 1027 event.mX = tx; 1028 event.mY = ty; 1029 } else { 1030 if (ViewDebug.DEBUG_DRAG) { 1031 Log.d(View.VIEW_LOG_TAG, " not dropped on an accepting view"); 1032 } 1033 } 1034 } break; 1035 } 1036 1037 // If none of our children could handle the event, try here 1038 if (!retval) { 1039 // Call up to the View implementation that dispatches to installed listeners 1040 retval = super.dispatchDragEvent(event); 1041 } 1042 return retval; 1043 } 1044 1045 // Find the frontmost child view that lies under the given point, and calculate 1046 // the position within its own local coordinate system. 1047 View findFrontmostDroppableChildAt(float x, float y, PointF outLocalPoint) { 1048 final int count = mChildrenCount; 1049 final View[] children = mChildren; 1050 for (int i = count - 1; i >= 0; i--) { 1051 final View child = children[i]; 1052 if (!child.mCanAcceptDrop) { 1053 continue; 1054 } 1055 1056 if (isTransformedTouchPointInView(x, y, child, outLocalPoint)) { 1057 return child; 1058 } 1059 } 1060 return null; 1061 } 1062 1063 boolean notifyChildOfDrag(View child) { 1064 if (ViewDebug.DEBUG_DRAG) { 1065 Log.d(View.VIEW_LOG_TAG, "Sending drag-started to view: " + child); 1066 } 1067 1068 if (! mDragNotifiedChildren.contains(child)) { 1069 mDragNotifiedChildren.add(child); 1070 child.mCanAcceptDrop = child.dispatchDragEvent(mCurrentDrag); 1071 } 1072 return child.mCanAcceptDrop; 1073 } 1074 1075 @Override 1076 public void dispatchSystemUiVisibilityChanged(int visible) { 1077 super.dispatchSystemUiVisibilityChanged(visible); 1078 1079 final int count = mChildrenCount; 1080 final View[] children = mChildren; 1081 for (int i=0; i <count; i++) { 1082 final View child = children[i]; 1083 child.dispatchSystemUiVisibilityChanged(visible); 1084 } 1085 } 1086 1087 /** 1088 * {@inheritDoc} 1089 */ 1090 @Override 1091 public boolean dispatchKeyEventPreIme(KeyEvent event) { 1092 if ((mPrivateFlags & (FOCUSED | HAS_BOUNDS)) == (FOCUSED | HAS_BOUNDS)) { 1093 return super.dispatchKeyEventPreIme(event); 1094 } else if (mFocused != null && (mFocused.mPrivateFlags & HAS_BOUNDS) == HAS_BOUNDS) { 1095 return mFocused.dispatchKeyEventPreIme(event); 1096 } 1097 return false; 1098 } 1099 1100 /** 1101 * {@inheritDoc} 1102 */ 1103 @Override 1104 public boolean dispatchKeyEvent(KeyEvent event) { 1105 if ((mPrivateFlags & (FOCUSED | HAS_BOUNDS)) == (FOCUSED | HAS_BOUNDS)) { 1106 return super.dispatchKeyEvent(event); 1107 } else if (mFocused != null && (mFocused.mPrivateFlags & HAS_BOUNDS) == HAS_BOUNDS) { 1108 return mFocused.dispatchKeyEvent(event); 1109 } 1110 return false; 1111 } 1112 1113 /** 1114 * {@inheritDoc} 1115 */ 1116 @Override 1117 public boolean dispatchKeyShortcutEvent(KeyEvent event) { 1118 if ((mPrivateFlags & (FOCUSED | HAS_BOUNDS)) == (FOCUSED | HAS_BOUNDS)) { 1119 return super.dispatchKeyShortcutEvent(event); 1120 } else if (mFocused != null && (mFocused.mPrivateFlags & HAS_BOUNDS) == HAS_BOUNDS) { 1121 return mFocused.dispatchKeyShortcutEvent(event); 1122 } 1123 return false; 1124 } 1125 1126 /** 1127 * {@inheritDoc} 1128 */ 1129 @Override 1130 public boolean dispatchTrackballEvent(MotionEvent event) { 1131 if ((mPrivateFlags & (FOCUSED | HAS_BOUNDS)) == (FOCUSED | HAS_BOUNDS)) { 1132 return super.dispatchTrackballEvent(event); 1133 } else if (mFocused != null && (mFocused.mPrivateFlags & HAS_BOUNDS) == HAS_BOUNDS) { 1134 return mFocused.dispatchTrackballEvent(event); 1135 } 1136 return false; 1137 } 1138 1139 /** 1140 * {@inheritDoc} 1141 */ 1142 @Override 1143 public boolean dispatchGenericMotionEvent(MotionEvent event) { 1144 if ((mPrivateFlags & (FOCUSED | HAS_BOUNDS)) == (FOCUSED | HAS_BOUNDS)) { 1145 return super.dispatchGenericMotionEvent(event); 1146 } else if (mFocused != null && (mFocused.mPrivateFlags & HAS_BOUNDS) == HAS_BOUNDS) { 1147 return mFocused.dispatchGenericMotionEvent(event); 1148 } 1149 return false; 1150 } 1151 1152 /** 1153 * {@inheritDoc} 1154 */ 1155 @Override 1156 public boolean dispatchTouchEvent(MotionEvent ev) { 1157 if (!onFilterTouchEventForSecurity(ev)) { 1158 return false; 1159 } 1160 1161 final int action = ev.getAction(); 1162 final int actionMasked = action & MotionEvent.ACTION_MASK; 1163 1164 // Handle an initial down. 1165 if (actionMasked == MotionEvent.ACTION_DOWN) { 1166 // Throw away all previous state when starting a new touch gesture. 1167 // The framework may have dropped the up or cancel event for the previous gesture 1168 // due to an app switch, ANR, or some other state change. 1169 cancelAndClearTouchTargets(ev); 1170 resetTouchState(); 1171 } 1172 1173 // Check for interception. 1174 final boolean intercepted; 1175 if (actionMasked == MotionEvent.ACTION_DOWN || mFirstTouchTarget != null) { 1176 final boolean disallowIntercept = (mGroupFlags & FLAG_DISALLOW_INTERCEPT) != 0; 1177 if (!disallowIntercept) { 1178 intercepted = onInterceptTouchEvent(ev); 1179 ev.setAction(action); // restore action in case onInterceptTouchEvent() changed it 1180 } else { 1181 intercepted = false; 1182 } 1183 } else { 1184 intercepted = true; 1185 } 1186 1187 // Check for cancelation. 1188 final boolean canceled = resetCancelNextUpFlag(this) 1189 || actionMasked == MotionEvent.ACTION_CANCEL; 1190 1191 // Update list of touch targets for pointer down, if needed. 1192 final boolean split = (mGroupFlags & FLAG_SPLIT_MOTION_EVENTS) != 0; 1193 TouchTarget newTouchTarget = null; 1194 boolean alreadyDispatchedToNewTouchTarget = false; 1195 if (!canceled && !intercepted) { 1196 if (actionMasked == MotionEvent.ACTION_DOWN 1197 || (split && actionMasked == MotionEvent.ACTION_POINTER_DOWN)) { 1198 final int actionIndex = ev.getActionIndex(); // always 0 for down 1199 final int idBitsToAssign = split ? 1 << ev.getPointerId(actionIndex) 1200 : TouchTarget.ALL_POINTER_IDS; 1201 1202 // Clean up earlier touch targets for this pointer id in case they 1203 // have become out of sync. 1204 removePointersFromTouchTargets(idBitsToAssign); 1205 1206 final int childrenCount = mChildrenCount; 1207 if (childrenCount != 0) { 1208 // Find a child that can receive the event. Scan children from front to back. 1209 final View[] children = mChildren; 1210 final float x = ev.getX(actionIndex); 1211 final float y = ev.getY(actionIndex); 1212 1213 for (int i = childrenCount - 1; i >= 0; i--) { 1214 final View child = children[i]; 1215 if ((child.mViewFlags & VISIBILITY_MASK) != VISIBLE 1216 && child.getAnimation() == null) { 1217 // Skip invisible child unless it is animating. 1218 continue; 1219 } 1220 1221 if (!isTransformedTouchPointInView(x, y, child, null)) { 1222 // New pointer is out of child's bounds. 1223 continue; 1224 } 1225 1226 newTouchTarget = getTouchTarget(child); 1227 if (newTouchTarget != null) { 1228 // Child is already receiving touch within its bounds. 1229 // Give it the new pointer in addition to the ones it is handling. 1230 newTouchTarget.pointerIdBits |= idBitsToAssign; 1231 break; 1232 } 1233 1234 resetCancelNextUpFlag(child); 1235 if (dispatchTransformedTouchEvent(ev, false, child, idBitsToAssign)) { 1236 // Child wants to receive touch within its bounds. 1237 mLastTouchDownTime = ev.getDownTime(); 1238 mLastTouchDownIndex = i; 1239 mLastTouchDownX = ev.getX(); 1240 mLastTouchDownY = ev.getY(); 1241 newTouchTarget = addTouchTarget(child, idBitsToAssign); 1242 alreadyDispatchedToNewTouchTarget = true; 1243 break; 1244 } 1245 } 1246 } 1247 1248 if (newTouchTarget == null && mFirstTouchTarget != null) { 1249 // Did not find a child to receive the event. 1250 // Assign the pointer to the least recently added target. 1251 newTouchTarget = mFirstTouchTarget; 1252 while (newTouchTarget.next != null) { 1253 newTouchTarget = newTouchTarget.next; 1254 } 1255 newTouchTarget.pointerIdBits |= idBitsToAssign; 1256 } 1257 } 1258 } 1259 1260 // Dispatch to touch targets. 1261 boolean handled = false; 1262 if (mFirstTouchTarget == null) { 1263 // No touch targets so treat this as an ordinary view. 1264 handled = dispatchTransformedTouchEvent(ev, canceled, null, 1265 TouchTarget.ALL_POINTER_IDS); 1266 } else { 1267 // Dispatch to touch targets, excluding the new touch target if we already 1268 // dispatched to it. Cancel touch targets if necessary. 1269 TouchTarget predecessor = null; 1270 TouchTarget target = mFirstTouchTarget; 1271 while (target != null) { 1272 final TouchTarget next = target.next; 1273 if (alreadyDispatchedToNewTouchTarget && target == newTouchTarget) { 1274 handled = true; 1275 } else { 1276 final boolean cancelChild = resetCancelNextUpFlag(target.child) || intercepted; 1277 if (dispatchTransformedTouchEvent(ev, cancelChild, 1278 target.child, target.pointerIdBits)) { 1279 handled = true; 1280 } 1281 if (cancelChild) { 1282 if (predecessor == null) { 1283 mFirstTouchTarget = next; 1284 } else { 1285 predecessor.next = next; 1286 } 1287 target.recycle(); 1288 target = next; 1289 continue; 1290 } 1291 } 1292 predecessor = target; 1293 target = next; 1294 } 1295 } 1296 1297 // Update list of touch targets for pointer up or cancel, if needed. 1298 if (canceled || actionMasked == MotionEvent.ACTION_UP) { 1299 resetTouchState(); 1300 } else if (split && actionMasked == MotionEvent.ACTION_POINTER_UP) { 1301 final int actionIndex = ev.getActionIndex(); 1302 final int idBitsToRemove = 1 << ev.getPointerId(actionIndex); 1303 removePointersFromTouchTargets(idBitsToRemove); 1304 } 1305 1306 return handled; 1307 } 1308 1309 /** 1310 * Resets all touch state in preparation for a new cycle. 1311 */ 1312 private void resetTouchState() { 1313 clearTouchTargets(); 1314 resetCancelNextUpFlag(this); 1315 mGroupFlags &= ~FLAG_DISALLOW_INTERCEPT; 1316 } 1317 1318 /** 1319 * Resets the cancel next up flag. 1320 * Returns true if the flag was previously set. 1321 */ 1322 private boolean resetCancelNextUpFlag(View view) { 1323 if ((view.mPrivateFlags & CANCEL_NEXT_UP_EVENT) != 0) { 1324 view.mPrivateFlags &= ~CANCEL_NEXT_UP_EVENT; 1325 return true; 1326 } 1327 return false; 1328 } 1329 1330 /** 1331 * Clears all touch targets. 1332 */ 1333 private void clearTouchTargets() { 1334 TouchTarget target = mFirstTouchTarget; 1335 if (target != null) { 1336 do { 1337 TouchTarget next = target.next; 1338 target.recycle(); 1339 target = next; 1340 } while (target != null); 1341 mFirstTouchTarget = null; 1342 } 1343 } 1344 1345 /** 1346 * Cancels and clears all touch targets. 1347 */ 1348 private void cancelAndClearTouchTargets(MotionEvent event) { 1349 if (mFirstTouchTarget != null) { 1350 boolean syntheticEvent = false; 1351 if (event == null) { 1352 final long now = SystemClock.uptimeMillis(); 1353 event = MotionEvent.obtain(now, now, 1354 MotionEvent.ACTION_CANCEL, 0.0f, 0.0f, 0); 1355 syntheticEvent = true; 1356 } 1357 1358 for (TouchTarget target = mFirstTouchTarget; target != null; target = target.next) { 1359 resetCancelNextUpFlag(target.child); 1360 dispatchTransformedTouchEvent(event, true, target.child, target.pointerIdBits); 1361 } 1362 clearTouchTargets(); 1363 1364 if (syntheticEvent) { 1365 event.recycle(); 1366 } 1367 } 1368 } 1369 1370 /** 1371 * Gets the touch target for specified child view. 1372 * Returns null if not found. 1373 */ 1374 private TouchTarget getTouchTarget(View child) { 1375 for (TouchTarget target = mFirstTouchTarget; target != null; target = target.next) { 1376 if (target.child == child) { 1377 return target; 1378 } 1379 } 1380 return null; 1381 } 1382 1383 /** 1384 * Adds a touch target for specified child to the beginning of the list. 1385 * Assumes the target child is not already present. 1386 */ 1387 private TouchTarget addTouchTarget(View child, int pointerIdBits) { 1388 TouchTarget target = TouchTarget.obtain(child, pointerIdBits); 1389 target.next = mFirstTouchTarget; 1390 mFirstTouchTarget = target; 1391 return target; 1392 } 1393 1394 /** 1395 * Removes the pointer ids from consideration. 1396 */ 1397 private void removePointersFromTouchTargets(int pointerIdBits) { 1398 TouchTarget predecessor = null; 1399 TouchTarget target = mFirstTouchTarget; 1400 while (target != null) { 1401 final TouchTarget next = target.next; 1402 if ((target.pointerIdBits & pointerIdBits) != 0) { 1403 target.pointerIdBits &= ~pointerIdBits; 1404 if (target.pointerIdBits == 0) { 1405 if (predecessor == null) { 1406 mFirstTouchTarget = next; 1407 } else { 1408 predecessor.next = next; 1409 } 1410 target.recycle(); 1411 target = next; 1412 continue; 1413 } 1414 } 1415 predecessor = target; 1416 target = next; 1417 } 1418 } 1419 1420 /** 1421 * Returns true if a child view contains the specified point when transformed 1422 * into its coordinate space. 1423 * Child must not be null. 1424 * @hide 1425 */ 1426 protected boolean isTransformedTouchPointInView(float x, float y, View child, 1427 PointF outLocalPoint) { 1428 float localX = x + mScrollX - child.mLeft; 1429 float localY = y + mScrollY - child.mTop; 1430 if (! child.hasIdentityMatrix() && mAttachInfo != null) { 1431 final float[] localXY = mAttachInfo.mTmpTransformLocation; 1432 localXY[0] = localX; 1433 localXY[1] = localY; 1434 child.getInverseMatrix().mapPoints(localXY); 1435 localX = localXY[0]; 1436 localY = localXY[1]; 1437 } 1438 final boolean isInView = child.pointInView(localX, localY); 1439 if (isInView && outLocalPoint != null) { 1440 outLocalPoint.set(localX, localY); 1441 } 1442 return isInView; 1443 } 1444 1445 /** 1446 * Transforms a motion event into the coordinate space of a particular child view, 1447 * filters out irrelevant pointer ids, and overrides its action if necessary. 1448 * If child is null, assumes the MotionEvent will be sent to this ViewGroup instead. 1449 */ 1450 private boolean dispatchTransformedTouchEvent(MotionEvent event, boolean cancel, 1451 View child, int desiredPointerIdBits) { 1452 final boolean handled; 1453 1454 // Canceling motions is a special case. We don't need to perform any transformations 1455 // or filtering. The important part is the action, not the contents. 1456 final int oldAction = event.getAction(); 1457 if (cancel || oldAction == MotionEvent.ACTION_CANCEL) { 1458 event.setAction(MotionEvent.ACTION_CANCEL); 1459 if (child == null) { 1460 handled = super.dispatchTouchEvent(event); 1461 } else { 1462 handled = child.dispatchTouchEvent(event); 1463 } 1464 event.setAction(oldAction); 1465 return handled; 1466 } 1467 1468 // Calculate the number of pointers to deliver. 1469 final int oldPointerCount = event.getPointerCount(); 1470 int newPointerCount = 0; 1471 if (desiredPointerIdBits == TouchTarget.ALL_POINTER_IDS) { 1472 newPointerCount = oldPointerCount; 1473 } else { 1474 for (int i = 0; i < oldPointerCount; i++) { 1475 final int pointerId = event.getPointerId(i); 1476 final int pointerIdBit = 1 << pointerId; 1477 if ((pointerIdBit & desiredPointerIdBits) != 0) { 1478 newPointerCount += 1; 1479 } 1480 } 1481 } 1482 1483 // If for some reason we ended up in an inconsistent state where it looks like we 1484 // might produce a motion event with no pointers in it, then drop the event. 1485 if (newPointerCount == 0) { 1486 return false; 1487 } 1488 1489 // If the number of pointers is the same and we don't need to perform any fancy 1490 // irreversible transformations, then we can reuse the motion event for this 1491 // dispatch as long as we are careful to revert any changes we make. 1492 final boolean reuse = newPointerCount == oldPointerCount 1493 && (child == null || child.hasIdentityMatrix()); 1494 if (reuse) { 1495 if (child == null) { 1496 handled = super.dispatchTouchEvent(event); 1497 } else { 1498 final float offsetX = mScrollX - child.mLeft; 1499 final float offsetY = mScrollY - child.mTop; 1500 event.offsetLocation(offsetX, offsetY); 1501 1502 handled = child.dispatchTouchEvent(event); 1503 1504 event.offsetLocation(-offsetX, -offsetY); 1505 } 1506 return handled; 1507 } 1508 1509 // Make a copy of the event. 1510 // If the number of pointers is different, then we need to filter out irrelevant pointers 1511 // as we make a copy of the motion event. 1512 MotionEvent transformedEvent; 1513 if (newPointerCount == oldPointerCount) { 1514 transformedEvent = MotionEvent.obtain(event); 1515 } else { 1516 growTmpPointerArrays(newPointerCount); 1517 final int[] newPointerIndexMap = mTmpPointerIndexMap; 1518 final int[] newPointerIds = mTmpPointerIds; 1519 final MotionEvent.PointerCoords[] newPointerCoords = mTmpPointerCoords; 1520 1521 int newPointerIndex = 0; 1522 int oldPointerIndex = 0; 1523 while (newPointerIndex < newPointerCount) { 1524 final int pointerId = event.getPointerId(oldPointerIndex); 1525 final int pointerIdBits = 1 << pointerId; 1526 if ((pointerIdBits & desiredPointerIdBits) != 0) { 1527 newPointerIndexMap[newPointerIndex] = oldPointerIndex; 1528 newPointerIds[newPointerIndex] = pointerId; 1529 if (newPointerCoords[newPointerIndex] == null) { 1530 newPointerCoords[newPointerIndex] = new MotionEvent.PointerCoords(); 1531 } 1532 1533 newPointerIndex += 1; 1534 } 1535 oldPointerIndex += 1; 1536 } 1537 1538 final int newAction; 1539 if (cancel) { 1540 newAction = MotionEvent.ACTION_CANCEL; 1541 } else { 1542 final int oldMaskedAction = oldAction & MotionEvent.ACTION_MASK; 1543 if (oldMaskedAction == MotionEvent.ACTION_POINTER_DOWN 1544 || oldMaskedAction == MotionEvent.ACTION_POINTER_UP) { 1545 final int changedPointerId = event.getPointerId( 1546 (oldAction & MotionEvent.ACTION_POINTER_INDEX_MASK) 1547 >> MotionEvent.ACTION_POINTER_INDEX_SHIFT); 1548 final int changedPointerIdBits = 1 << changedPointerId; 1549 if ((changedPointerIdBits & desiredPointerIdBits) != 0) { 1550 if (newPointerCount == 1) { 1551 // The first/last pointer went down/up. 1552 newAction = oldMaskedAction == MotionEvent.ACTION_POINTER_DOWN 1553 ? MotionEvent.ACTION_DOWN : MotionEvent.ACTION_UP; 1554 } else { 1555 // A secondary pointer went down/up. 1556 int newChangedPointerIndex = 0; 1557 while (newPointerIds[newChangedPointerIndex] != changedPointerId) { 1558 newChangedPointerIndex += 1; 1559 } 1560 newAction = oldMaskedAction | (newChangedPointerIndex 1561 << MotionEvent.ACTION_POINTER_INDEX_SHIFT); 1562 } 1563 } else { 1564 // An unrelated pointer changed. 1565 newAction = MotionEvent.ACTION_MOVE; 1566 } 1567 } else { 1568 // Simple up/down/cancel/move motion action. 1569 newAction = oldMaskedAction; 1570 } 1571 } 1572 1573 transformedEvent = null; 1574 final int historySize = event.getHistorySize(); 1575 for (int historyIndex = 0; historyIndex <= historySize; historyIndex++) { 1576 for (newPointerIndex = 0; newPointerIndex < newPointerCount; newPointerIndex++) { 1577 final MotionEvent.PointerCoords c = newPointerCoords[newPointerIndex]; 1578 oldPointerIndex = newPointerIndexMap[newPointerIndex]; 1579 if (historyIndex != historySize) { 1580 event.getHistoricalPointerCoords(oldPointerIndex, historyIndex, c); 1581 } else { 1582 event.getPointerCoords(oldPointerIndex, c); 1583 } 1584 } 1585 1586 final long eventTime; 1587 if (historyIndex != historySize) { 1588 eventTime = event.getHistoricalEventTime(historyIndex); 1589 } else { 1590 eventTime = event.getEventTime(); 1591 } 1592 1593 if (transformedEvent == null) { 1594 transformedEvent = MotionEvent.obtain( 1595 event.getDownTime(), eventTime, newAction, 1596 newPointerCount, newPointerIds, newPointerCoords, 1597 event.getMetaState(), event.getXPrecision(), event.getYPrecision(), 1598 event.getDeviceId(), event.getEdgeFlags(), event.getSource(), 1599 event.getFlags()); 1600 } else { 1601 transformedEvent.addBatch(eventTime, newPointerCoords, 0); 1602 } 1603 } 1604 } 1605 1606 // Perform any necessary transformations and dispatch. 1607 if (child == null) { 1608 handled = super.dispatchTouchEvent(transformedEvent); 1609 } else { 1610 final float offsetX = mScrollX - child.mLeft; 1611 final float offsetY = mScrollY - child.mTop; 1612 transformedEvent.offsetLocation(offsetX, offsetY); 1613 if (! child.hasIdentityMatrix()) { 1614 transformedEvent.transform(child.getInverseMatrix()); 1615 } 1616 1617 handled = child.dispatchTouchEvent(transformedEvent); 1618 } 1619 1620 // Done. 1621 transformedEvent.recycle(); 1622 return handled; 1623 } 1624 1625 /** 1626 * Enlarge the temporary pointer arrays for splitting pointers. 1627 * May discard contents (but keeps PointerCoords objects to avoid reallocating them). 1628 */ 1629 private void growTmpPointerArrays(int desiredCapacity) { 1630 final MotionEvent.PointerCoords[] oldTmpPointerCoords = mTmpPointerCoords; 1631 int capacity; 1632 if (oldTmpPointerCoords != null) { 1633 capacity = oldTmpPointerCoords.length; 1634 if (desiredCapacity <= capacity) { 1635 return; 1636 } 1637 } else { 1638 capacity = 4; 1639 } 1640 1641 while (capacity < desiredCapacity) { 1642 capacity *= 2; 1643 } 1644 1645 mTmpPointerIndexMap = new int[capacity]; 1646 mTmpPointerIds = new int[capacity]; 1647 mTmpPointerCoords = new MotionEvent.PointerCoords[capacity]; 1648 1649 if (oldTmpPointerCoords != null) { 1650 System.arraycopy(oldTmpPointerCoords, 0, mTmpPointerCoords, 0, 1651 oldTmpPointerCoords.length); 1652 } 1653 } 1654 1655 /** 1656 * Enable or disable the splitting of MotionEvents to multiple children during touch event 1657 * dispatch. This behavior is enabled by default for applications that target an 1658 * SDK version of {@link Build.VERSION_CODES#HONEYCOMB} or newer. 1659 * 1660 * <p>When this option is enabled MotionEvents may be split and dispatched to different child 1661 * views depending on where each pointer initially went down. This allows for user interactions 1662 * such as scrolling two panes of content independently, chording of buttons, and performing 1663 * independent gestures on different pieces of content. 1664 * 1665 * @param split <code>true</code> to allow MotionEvents to be split and dispatched to multiple 1666 * child views. <code>false</code> to only allow one child view to be the target of 1667 * any MotionEvent received by this ViewGroup. 1668 */ 1669 public void setMotionEventSplittingEnabled(boolean split) { 1670 // TODO Applications really shouldn't change this setting mid-touch event, 1671 // but perhaps this should handle that case and send ACTION_CANCELs to any child views 1672 // with gestures in progress when this is changed. 1673 if (split) { 1674 mGroupFlags |= FLAG_SPLIT_MOTION_EVENTS; 1675 } else { 1676 mGroupFlags &= ~FLAG_SPLIT_MOTION_EVENTS; 1677 } 1678 } 1679 1680 /** 1681 * Returns true if MotionEvents dispatched to this ViewGroup can be split to multiple children. 1682 * @return true if MotionEvents dispatched to this ViewGroup can be split to multiple children. 1683 */ 1684 public boolean isMotionEventSplittingEnabled() { 1685 return (mGroupFlags & FLAG_SPLIT_MOTION_EVENTS) == FLAG_SPLIT_MOTION_EVENTS; 1686 } 1687 1688 /** 1689 * {@inheritDoc} 1690 */ 1691 public void requestDisallowInterceptTouchEvent(boolean disallowIntercept) { 1692 1693 if (disallowIntercept == ((mGroupFlags & FLAG_DISALLOW_INTERCEPT) != 0)) { 1694 // We're already in this state, assume our ancestors are too 1695 return; 1696 } 1697 1698 if (disallowIntercept) { 1699 mGroupFlags |= FLAG_DISALLOW_INTERCEPT; 1700 } else { 1701 mGroupFlags &= ~FLAG_DISALLOW_INTERCEPT; 1702 } 1703 1704 // Pass it up to our parent 1705 if (mParent != null) { 1706 mParent.requestDisallowInterceptTouchEvent(disallowIntercept); 1707 } 1708 } 1709 1710 /** 1711 * Implement this method to intercept all touch screen motion events. This 1712 * allows you to watch events as they are dispatched to your children, and 1713 * take ownership of the current gesture at any point. 1714 * 1715 * <p>Using this function takes some care, as it has a fairly complicated 1716 * interaction with {@link View#onTouchEvent(MotionEvent) 1717 * View.onTouchEvent(MotionEvent)}, and using it requires implementing 1718 * that method as well as this one in the correct way. Events will be 1719 * received in the following order: 1720 * 1721 * <ol> 1722 * <li> You will receive the down event here. 1723 * <li> The down event will be handled either by a child of this view 1724 * group, or given to your own onTouchEvent() method to handle; this means 1725 * you should implement onTouchEvent() to return true, so you will 1726 * continue to see the rest of the gesture (instead of looking for 1727 * a parent view to handle it). Also, by returning true from 1728 * onTouchEvent(), you will not receive any following 1729 * events in onInterceptTouchEvent() and all touch processing must 1730 * happen in onTouchEvent() like normal. 1731 * <li> For as long as you return false from this function, each following 1732 * event (up to and including the final up) will be delivered first here 1733 * and then to the target's onTouchEvent(). 1734 * <li> If you return true from here, you will not receive any 1735 * following events: the target view will receive the same event but 1736 * with the action {@link MotionEvent#ACTION_CANCEL}, and all further 1737 * events will be delivered to your onTouchEvent() method and no longer 1738 * appear here. 1739 * </ol> 1740 * 1741 * @param ev The motion event being dispatched down the hierarchy. 1742 * @return Return true to steal motion events from the children and have 1743 * them dispatched to this ViewGroup through onTouchEvent(). 1744 * The current target will receive an ACTION_CANCEL event, and no further 1745 * messages will be delivered here. 1746 */ 1747 public boolean onInterceptTouchEvent(MotionEvent ev) { 1748 return false; 1749 } 1750 1751 /** 1752 * {@inheritDoc} 1753 * 1754 * Looks for a view to give focus to respecting the setting specified by 1755 * {@link #getDescendantFocusability()}. 1756 * 1757 * Uses {@link #onRequestFocusInDescendants(int, android.graphics.Rect)} to 1758 * find focus within the children of this group when appropriate. 1759 * 1760 * @see #FOCUS_BEFORE_DESCENDANTS 1761 * @see #FOCUS_AFTER_DESCENDANTS 1762 * @see #FOCUS_BLOCK_DESCENDANTS 1763 * @see #onRequestFocusInDescendants 1764 */ 1765 @Override 1766 public boolean requestFocus(int direction, Rect previouslyFocusedRect) { 1767 if (DBG) { 1768 System.out.println(this + " ViewGroup.requestFocus direction=" 1769 + direction); 1770 } 1771 int descendantFocusability = getDescendantFocusability(); 1772 1773 switch (descendantFocusability) { 1774 case FOCUS_BLOCK_DESCENDANTS: 1775 return super.requestFocus(direction, previouslyFocusedRect); 1776 case FOCUS_BEFORE_DESCENDANTS: { 1777 final boolean took = super.requestFocus(direction, previouslyFocusedRect); 1778 return took ? took : onRequestFocusInDescendants(direction, previouslyFocusedRect); 1779 } 1780 case FOCUS_AFTER_DESCENDANTS: { 1781 final boolean took = onRequestFocusInDescendants(direction, previouslyFocusedRect); 1782 return took ? took : super.requestFocus(direction, previouslyFocusedRect); 1783 } 1784 default: 1785 throw new IllegalStateException("descendant focusability must be " 1786 + "one of FOCUS_BEFORE_DESCENDANTS, FOCUS_AFTER_DESCENDANTS, FOCUS_BLOCK_DESCENDANTS " 1787 + "but is " + descendantFocusability); 1788 } 1789 } 1790 1791 /** 1792 * Look for a descendant to call {@link View#requestFocus} on. 1793 * Called by {@link ViewGroup#requestFocus(int, android.graphics.Rect)} 1794 * when it wants to request focus within its children. Override this to 1795 * customize how your {@link ViewGroup} requests focus within its children. 1796 * @param direction One of FOCUS_UP, FOCUS_DOWN, FOCUS_LEFT, and FOCUS_RIGHT 1797 * @param previouslyFocusedRect The rectangle (in this View's coordinate system) 1798 * to give a finer grained hint about where focus is coming from. May be null 1799 * if there is no hint. 1800 * @return Whether focus was taken. 1801 */ 1802 @SuppressWarnings({"ConstantConditions"}) 1803 protected boolean onRequestFocusInDescendants(int direction, 1804 Rect previouslyFocusedRect) { 1805 int index; 1806 int increment; 1807 int end; 1808 int count = mChildrenCount; 1809 if ((direction & FOCUS_FORWARD) != 0) { 1810 index = 0; 1811 increment = 1; 1812 end = count; 1813 } else { 1814 index = count - 1; 1815 increment = -1; 1816 end = -1; 1817 } 1818 final View[] children = mChildren; 1819 for (int i = index; i != end; i += increment) { 1820 View child = children[i]; 1821 if ((child.mViewFlags & VISIBILITY_MASK) == VISIBLE) { 1822 if (child.requestFocus(direction, previouslyFocusedRect)) { 1823 return true; 1824 } 1825 } 1826 } 1827 return false; 1828 } 1829 1830 /** 1831 * {@inheritDoc} 1832 * 1833 * @hide 1834 */ 1835 @Override 1836 public void dispatchStartTemporaryDetach() { 1837 super.dispatchStartTemporaryDetach(); 1838 final int count = mChildrenCount; 1839 final View[] children = mChildren; 1840 for (int i = 0; i < count; i++) { 1841 children[i].dispatchStartTemporaryDetach(); 1842 } 1843 } 1844 1845 /** 1846 * {@inheritDoc} 1847 * 1848 * @hide 1849 */ 1850 @Override 1851 public void dispatchFinishTemporaryDetach() { 1852 super.dispatchFinishTemporaryDetach(); 1853 final int count = mChildrenCount; 1854 final View[] children = mChildren; 1855 for (int i = 0; i < count; i++) { 1856 children[i].dispatchFinishTemporaryDetach(); 1857 } 1858 } 1859 1860 /** 1861 * {@inheritDoc} 1862 */ 1863 @Override 1864 void dispatchAttachedToWindow(AttachInfo info, int visibility) { 1865 super.dispatchAttachedToWindow(info, visibility); 1866 visibility |= mViewFlags & VISIBILITY_MASK; 1867 final int count = mChildrenCount; 1868 final View[] children = mChildren; 1869 for (int i = 0; i < count; i++) { 1870 children[i].dispatchAttachedToWindow(info, visibility); 1871 } 1872 } 1873 1874 @Override 1875 public boolean dispatchPopulateAccessibilityEvent(AccessibilityEvent event) { 1876 boolean populated = false; 1877 for (int i = 0, count = getChildCount(); i < count; i++) { 1878 populated |= getChildAt(i).dispatchPopulateAccessibilityEvent(event); 1879 } 1880 return populated; 1881 } 1882 1883 /** 1884 * {@inheritDoc} 1885 */ 1886 @Override 1887 void dispatchDetachedFromWindow() { 1888 // If we still have a touch target, we are still in the process of 1889 // dispatching motion events to a child; we need to get rid of that 1890 // child to avoid dispatching events to it after the window is torn 1891 // down. To make sure we keep the child in a consistent state, we 1892 // first send it an ACTION_CANCEL motion event. 1893 cancelAndClearTouchTargets(null); 1894 1895 // In case view is detached while transition is running 1896 mLayoutSuppressed = false; 1897 1898 // Tear down our drag tracking 1899 mDragNotifiedChildren = null; 1900 if (mCurrentDrag != null) { 1901 mCurrentDrag.recycle(); 1902 mCurrentDrag = null; 1903 } 1904 1905 final int count = mChildrenCount; 1906 final View[] children = mChildren; 1907 for (int i = 0; i < count; i++) { 1908 children[i].dispatchDetachedFromWindow(); 1909 } 1910 super.dispatchDetachedFromWindow(); 1911 } 1912 1913 /** 1914 * {@inheritDoc} 1915 */ 1916 @Override 1917 public void setPadding(int left, int top, int right, int bottom) { 1918 super.setPadding(left, top, right, bottom); 1919 1920 if ((mPaddingLeft | mPaddingTop | mPaddingRight | mPaddingRight) != 0) { 1921 mGroupFlags |= FLAG_PADDING_NOT_NULL; 1922 } else { 1923 mGroupFlags &= ~FLAG_PADDING_NOT_NULL; 1924 } 1925 } 1926 1927 /** 1928 * {@inheritDoc} 1929 */ 1930 @Override 1931 protected void dispatchSaveInstanceState(SparseArray<Parcelable> container) { 1932 super.dispatchSaveInstanceState(container); 1933 final int count = mChildrenCount; 1934 final View[] children = mChildren; 1935 for (int i = 0; i < count; i++) { 1936 View c = children[i]; 1937 if ((c.mViewFlags & PARENT_SAVE_DISABLED_MASK) != PARENT_SAVE_DISABLED) { 1938 c.dispatchSaveInstanceState(container); 1939 } 1940 } 1941 } 1942 1943 /** 1944 * Perform dispatching of a {@link #saveHierarchyState freeze()} to only this view, 1945 * not to its children. For use when overriding 1946 * {@link #dispatchSaveInstanceState dispatchFreeze()} to allow subclasses to freeze 1947 * their own state but not the state of their children. 1948 * 1949 * @param container the container 1950 */ 1951 protected void dispatchFreezeSelfOnly(SparseArray<Parcelable> container) { 1952 super.dispatchSaveInstanceState(container); 1953 } 1954 1955 /** 1956 * {@inheritDoc} 1957 */ 1958 @Override 1959 protected void dispatchRestoreInstanceState(SparseArray<Parcelable> container) { 1960 super.dispatchRestoreInstanceState(container); 1961 final int count = mChildrenCount; 1962 final View[] children = mChildren; 1963 for (int i = 0; i < count; i++) { 1964 View c = children[i]; 1965 if ((c.mViewFlags & PARENT_SAVE_DISABLED_MASK) != PARENT_SAVE_DISABLED) { 1966 c.dispatchRestoreInstanceState(container); 1967 } 1968 } 1969 } 1970 1971 /** 1972 * Perform dispatching of a {@link #restoreHierarchyState thaw()} to only this view, 1973 * not to its children. For use when overriding 1974 * {@link #dispatchRestoreInstanceState dispatchThaw()} to allow subclasses to thaw 1975 * their own state but not the state of their children. 1976 * 1977 * @param container the container 1978 */ 1979 protected void dispatchThawSelfOnly(SparseArray<Parcelable> container) { 1980 super.dispatchRestoreInstanceState(container); 1981 } 1982 1983 /** 1984 * Enables or disables the drawing cache for each child of this view group. 1985 * 1986 * @param enabled true to enable the cache, false to dispose of it 1987 */ 1988 protected void setChildrenDrawingCacheEnabled(boolean enabled) { 1989 if (enabled || (mPersistentDrawingCache & PERSISTENT_ALL_CACHES) != PERSISTENT_ALL_CACHES) { 1990 final View[] children = mChildren; 1991 final int count = mChildrenCount; 1992 for (int i = 0; i < count; i++) { 1993 children[i].setDrawingCacheEnabled(enabled); 1994 } 1995 } 1996 } 1997 1998 @Override 1999 protected void onAnimationStart() { 2000 super.onAnimationStart(); 2001 2002 // When this ViewGroup's animation starts, build the cache for the children 2003 if ((mGroupFlags & FLAG_ANIMATION_CACHE) == FLAG_ANIMATION_CACHE) { 2004 final int count = mChildrenCount; 2005 final View[] children = mChildren; 2006 final boolean buildCache = !isHardwareAccelerated(); 2007 2008 for (int i = 0; i < count; i++) { 2009 final View child = children[i]; 2010 if ((child.mViewFlags & VISIBILITY_MASK) == VISIBLE) { 2011 child.setDrawingCacheEnabled(true); 2012 if (buildCache) { 2013 child.buildDrawingCache(true); 2014 } 2015 } 2016 } 2017 2018 mGroupFlags |= FLAG_CHILDREN_DRAWN_WITH_CACHE; 2019 } 2020 } 2021 2022 @Override 2023 protected void onAnimationEnd() { 2024 super.onAnimationEnd(); 2025 2026 // When this ViewGroup's animation ends, destroy the cache of the children 2027 if ((mGroupFlags & FLAG_ANIMATION_CACHE) == FLAG_ANIMATION_CACHE) { 2028 mGroupFlags &= ~FLAG_CHILDREN_DRAWN_WITH_CACHE; 2029 2030 if ((mPersistentDrawingCache & PERSISTENT_ANIMATION_CACHE) == 0) { 2031 setChildrenDrawingCacheEnabled(false); 2032 } 2033 } 2034 } 2035 2036 @Override 2037 Bitmap createSnapshot(Bitmap.Config quality, int backgroundColor, boolean skipChildren) { 2038 int count = mChildrenCount; 2039 int[] visibilities = null; 2040 2041 if (skipChildren) { 2042 visibilities = new int[count]; 2043 for (int i = 0; i < count; i++) { 2044 View child = getChildAt(i); 2045 visibilities[i] = child.getVisibility(); 2046 if (visibilities[i] == View.VISIBLE) { 2047 child.setVisibility(INVISIBLE); 2048 } 2049 } 2050 } 2051 2052 Bitmap b = super.createSnapshot(quality, backgroundColor, skipChildren); 2053 2054 if (skipChildren) { 2055 for (int i = 0; i < count; i++) { 2056 getChildAt(i).setVisibility(visibilities[i]); 2057 } 2058 } 2059 2060 return b; 2061 } 2062 2063 /** 2064 * {@inheritDoc} 2065 */ 2066 @Override 2067 protected void dispatchDraw(Canvas canvas) { 2068 final int count = mChildrenCount; 2069 final View[] children = mChildren; 2070 int flags = mGroupFlags; 2071 2072 if ((flags & FLAG_RUN_ANIMATION) != 0 && canAnimate()) { 2073 final boolean cache = (mGroupFlags & FLAG_ANIMATION_CACHE) == FLAG_ANIMATION_CACHE; 2074 2075 final boolean buildCache = !isHardwareAccelerated(); 2076 for (int i = 0; i < count; i++) { 2077 final View child = children[i]; 2078 if ((child.mViewFlags & VISIBILITY_MASK) == VISIBLE) { 2079 final LayoutParams params = child.getLayoutParams(); 2080 attachLayoutAnimationParameters(child, params, i, count); 2081 bindLayoutAnimation(child); 2082 if (cache) { 2083 child.setDrawingCacheEnabled(true); 2084 if (buildCache) { 2085 child.buildDrawingCache(true); 2086 } 2087 } 2088 } 2089 } 2090 2091 final LayoutAnimationController controller = mLayoutAnimationController; 2092 if (controller.willOverlap()) { 2093 mGroupFlags |= FLAG_OPTIMIZE_INVALIDATE; 2094 } 2095 2096 controller.start(); 2097 2098 mGroupFlags &= ~FLAG_RUN_ANIMATION; 2099 mGroupFlags &= ~FLAG_ANIMATION_DONE; 2100 2101 if (cache) { 2102 mGroupFlags |= FLAG_CHILDREN_DRAWN_WITH_CACHE; 2103 } 2104 2105 if (mAnimationListener != null) { 2106 mAnimationListener.onAnimationStart(controller.getAnimation()); 2107 } 2108 } 2109 2110 int saveCount = 0; 2111 final boolean clipToPadding = (flags & CLIP_TO_PADDING_MASK) == CLIP_TO_PADDING_MASK; 2112 if (clipToPadding) { 2113 saveCount = canvas.save(); 2114 canvas.clipRect(mScrollX + mPaddingLeft, mScrollY + mPaddingTop, 2115 mScrollX + mRight - mLeft - mPaddingRight, 2116 mScrollY + mBottom - mTop - mPaddingBottom); 2117 2118 } 2119 2120 // We will draw our child's animation, let's reset the flag 2121 mPrivateFlags &= ~DRAW_ANIMATION; 2122 mGroupFlags &= ~FLAG_INVALIDATE_REQUIRED; 2123 2124 boolean more = false; 2125 final long drawingTime = getDrawingTime(); 2126 2127 if ((flags & FLAG_USE_CHILD_DRAWING_ORDER) == 0) { 2128 for (int i = 0; i < count; i++) { 2129 final View child = children[i]; 2130 if ((child.mViewFlags & VISIBILITY_MASK) == VISIBLE || child.getAnimation() != null) { 2131 more |= drawChild(canvas, child, drawingTime); 2132 } 2133 } 2134 } else { 2135 for (int i = 0; i < count; i++) { 2136 final View child = children[getChildDrawingOrder(count, i)]; 2137 if ((child.mViewFlags & VISIBILITY_MASK) == VISIBLE || child.getAnimation() != null) { 2138 more |= drawChild(canvas, child, drawingTime); 2139 } 2140 } 2141 } 2142 2143 // Draw any disappearing views that have animations 2144 if (mDisappearingChildren != null) { 2145 final ArrayList<View> disappearingChildren = mDisappearingChildren; 2146 final int disappearingCount = disappearingChildren.size() - 1; 2147 // Go backwards -- we may delete as animations finish 2148 for (int i = disappearingCount; i >= 0; i--) { 2149 final View child = disappearingChildren.get(i); 2150 more |= drawChild(canvas, child, drawingTime); 2151 } 2152 } 2153 2154 if (clipToPadding) { 2155 canvas.restoreToCount(saveCount); 2156 } 2157 2158 // mGroupFlags might have been updated by drawChild() 2159 flags = mGroupFlags; 2160 2161 if ((flags & FLAG_INVALIDATE_REQUIRED) == FLAG_INVALIDATE_REQUIRED) { 2162 invalidate(); 2163 } 2164 2165 if ((flags & FLAG_ANIMATION_DONE) == 0 && (flags & FLAG_NOTIFY_ANIMATION_LISTENER) == 0 && 2166 mLayoutAnimationController.isDone() && !more) { 2167 // We want to erase the drawing cache and notify the listener after the 2168 // next frame is drawn because one extra invalidate() is caused by 2169 // drawChild() after the animation is over 2170 mGroupFlags |= FLAG_NOTIFY_ANIMATION_LISTENER; 2171 final Runnable end = new Runnable() { 2172 public void run() { 2173 notifyAnimationListener(); 2174 } 2175 }; 2176 post(end); 2177 } 2178 } 2179 2180 /** 2181 * Returns the index of the child to draw for this iteration. Override this 2182 * if you want to change the drawing order of children. By default, it 2183 * returns i. 2184 * <p> 2185 * NOTE: In order for this method to be called, you must enable child ordering 2186 * first by calling {@link #setChildrenDrawingOrderEnabled(boolean)}. 2187 * 2188 * @param i The current iteration. 2189 * @return The index of the child to draw this iteration. 2190 * 2191 * @see #setChildrenDrawingOrderEnabled(boolean) 2192 * @see #isChildrenDrawingOrderEnabled() 2193 */ 2194 protected int getChildDrawingOrder(int childCount, int i) { 2195 return i; 2196 } 2197 2198 private void notifyAnimationListener() { 2199 mGroupFlags &= ~FLAG_NOTIFY_ANIMATION_LISTENER; 2200 mGroupFlags |= FLAG_ANIMATION_DONE; 2201 2202 if (mAnimationListener != null) { 2203 final Runnable end = new Runnable() { 2204 public void run() { 2205 mAnimationListener.onAnimationEnd(mLayoutAnimationController.getAnimation()); 2206 } 2207 }; 2208 post(end); 2209 } 2210 2211 if ((mGroupFlags & FLAG_ANIMATION_CACHE) == FLAG_ANIMATION_CACHE) { 2212 mGroupFlags &= ~FLAG_CHILDREN_DRAWN_WITH_CACHE; 2213 if ((mPersistentDrawingCache & PERSISTENT_ANIMATION_CACHE) == 0) { 2214 setChildrenDrawingCacheEnabled(false); 2215 } 2216 } 2217 2218 invalidate(); 2219 } 2220 2221 /** 2222 * This method is used to cause children of this ViewGroup to restore or recreate their 2223 * display lists. It is called by getDisplayList() when the parent ViewGroup does not need 2224 * to recreate its own display list, which would happen if it went through the normal 2225 * draw/dispatchDraw mechanisms. 2226 * 2227 * @hide 2228 */ 2229 @Override 2230 protected void dispatchGetDisplayList() { 2231 final int count = mChildrenCount; 2232 final View[] children = mChildren; 2233 for (int i = 0; i < count; i++) { 2234 final View child = children[i]; 2235 child.mRecreateDisplayList = (child.mPrivateFlags & INVALIDATED) == INVALIDATED; 2236 child.mPrivateFlags &= ~INVALIDATED; 2237 child.getDisplayList(); 2238 child.mRecreateDisplayList = false; 2239 } 2240 } 2241 2242 /** 2243 * Draw one child of this View Group. This method is responsible for getting 2244 * the canvas in the right state. This includes clipping, translating so 2245 * that the child's scrolled origin is at 0, 0, and applying any animation 2246 * transformations. 2247 * 2248 * @param canvas The canvas on which to draw the child 2249 * @param child Who to draw 2250 * @param drawingTime The time at which draw is occuring 2251 * @return True if an invalidate() was issued 2252 */ 2253 protected boolean drawChild(Canvas canvas, View child, long drawingTime) { 2254 boolean more = false; 2255 2256 final int cl = child.mLeft; 2257 final int ct = child.mTop; 2258 final int cr = child.mRight; 2259 final int cb = child.mBottom; 2260 2261 final boolean childHasIdentityMatrix = child.hasIdentityMatrix(); 2262 2263 final int flags = mGroupFlags; 2264 2265 if ((flags & FLAG_CLEAR_TRANSFORMATION) == FLAG_CLEAR_TRANSFORMATION) { 2266 mChildTransformation.clear(); 2267 mGroupFlags &= ~FLAG_CLEAR_TRANSFORMATION; 2268 } 2269 2270 Transformation transformToApply = null; 2271 Transformation invalidationTransform; 2272 final Animation a = child.getAnimation(); 2273 boolean concatMatrix = false; 2274 2275 boolean scalingRequired = false; 2276 boolean caching; 2277 int layerType = child.getLayerType(); 2278 2279 if ((flags & FLAG_CHILDREN_DRAWN_WITH_CACHE) == FLAG_CHILDREN_DRAWN_WITH_CACHE || 2280 (flags & FLAG_ALWAYS_DRAWN_WITH_CACHE) == FLAG_ALWAYS_DRAWN_WITH_CACHE) { 2281 caching = true; 2282 if (mAttachInfo != null) scalingRequired = mAttachInfo.mScalingRequired; 2283 } else { 2284 caching = (layerType != LAYER_TYPE_NONE) || canvas.isHardwareAccelerated(); 2285 } 2286 2287 if (a != null) { 2288 final boolean initialized = a.isInitialized(); 2289 if (!initialized) { 2290 a.initialize(cr - cl, cb - ct, getWidth(), getHeight()); 2291 a.initializeInvalidateRegion(0, 0, cr - cl, cb - ct); 2292 child.onAnimationStart(); 2293 } 2294 2295 more = a.getTransformation(drawingTime, mChildTransformation, 2296 scalingRequired ? mAttachInfo.mApplicationScale : 1f); 2297 if (scalingRequired && mAttachInfo.mApplicationScale != 1f) { 2298 if (mInvalidationTransformation == null) { 2299 mInvalidationTransformation = new Transformation(); 2300 } 2301 invalidationTransform = mInvalidationTransformation; 2302 a.getTransformation(drawingTime, invalidationTransform, 1f); 2303 } else { 2304 invalidationTransform = mChildTransformation; 2305 } 2306 transformToApply = mChildTransformation; 2307 2308 concatMatrix = a.willChangeTransformationMatrix(); 2309 2310 if (more) { 2311 if (!a.willChangeBounds()) { 2312 if ((flags & (FLAG_OPTIMIZE_INVALIDATE | FLAG_ANIMATION_DONE)) == 2313 FLAG_OPTIMIZE_INVALIDATE) { 2314 mGroupFlags |= FLAG_INVALIDATE_REQUIRED; 2315 } else if ((flags & FLAG_INVALIDATE_REQUIRED) == 0) { 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 invalidate(cl, ct, cr, cb); 2320 } 2321 } else { 2322 if (mInvalidateRegion == null) { 2323 mInvalidateRegion = new RectF(); 2324 } 2325 final RectF region = mInvalidateRegion; 2326 a.getInvalidateRegion(0, 0, cr - cl, cb - ct, region, invalidationTransform); 2327 2328 // The child need to draw an animation, potentially offscreen, so 2329 // make sure we do not cancel invalidate requests 2330 mPrivateFlags |= DRAW_ANIMATION; 2331 2332 final int left = cl + (int) region.left; 2333 final int top = ct + (int) region.top; 2334 invalidate(left, top, left + (int) region.width(), top + (int) region.height()); 2335 } 2336 } 2337 } else if ((flags & FLAG_SUPPORT_STATIC_TRANSFORMATIONS) == 2338 FLAG_SUPPORT_STATIC_TRANSFORMATIONS) { 2339 final boolean hasTransform = getChildStaticTransformation(child, mChildTransformation); 2340 if (hasTransform) { 2341 final int transformType = mChildTransformation.getTransformationType(); 2342 transformToApply = transformType != Transformation.TYPE_IDENTITY ? 2343 mChildTransformation : null; 2344 concatMatrix = (transformType & Transformation.TYPE_MATRIX) != 0; 2345 } 2346 } 2347 2348 concatMatrix |= !childHasIdentityMatrix; 2349 2350 // Sets the flag as early as possible to allow draw() implementations 2351 // to call invalidate() successfully when doing animations 2352 child.mPrivateFlags |= DRAWN; 2353 2354 if (!concatMatrix && canvas.quickReject(cl, ct, cr, cb, Canvas.EdgeType.BW) && 2355 (child.mPrivateFlags & DRAW_ANIMATION) == 0) { 2356 return more; 2357 } 2358 2359 float alpha = child.getAlpha(); 2360 // Bail out early if the view does not need to be drawn 2361 if (alpha <= ViewConfiguration.ALPHA_THRESHOLD && (child.mPrivateFlags & ALPHA_SET) == 0 && 2362 !(child instanceof SurfaceView)) { 2363 return more; 2364 } 2365 2366 if (canvas.isHardwareAccelerated()) { 2367 // Clear INVALIDATED flag to allow invalidation to occur during rendering, but 2368 // retain the flag's value temporarily in the mRecreateDisplayList flag 2369 child.mRecreateDisplayList = (child.mPrivateFlags & INVALIDATED) == INVALIDATED; 2370 child.mPrivateFlags &= ~INVALIDATED; 2371 } 2372 2373 child.computeScroll(); 2374 2375 final int sx = child.mScrollX; 2376 final int sy = child.mScrollY; 2377 2378 DisplayList displayList = null; 2379 Bitmap cache = null; 2380 if (caching) { 2381 if (!canvas.isHardwareAccelerated()) { 2382 if (layerType != LAYER_TYPE_NONE) { 2383 layerType = LAYER_TYPE_SOFTWARE; 2384 child.buildDrawingCache(true); 2385 } 2386 cache = child.getDrawingCache(true); 2387 } else { 2388 if (layerType == LAYER_TYPE_SOFTWARE) { 2389 child.buildDrawingCache(true); 2390 cache = child.getDrawingCache(true); 2391 } else if (layerType == LAYER_TYPE_NONE) { 2392 displayList = child.getDisplayList(); 2393 } 2394 } 2395 } 2396 2397 final boolean hasDisplayList = displayList != null && displayList.isReady(); 2398 final boolean hasNoCache = cache == null || hasDisplayList; 2399 2400 final int restoreTo = canvas.save(); 2401 if (cache == null && !hasDisplayList) { 2402 canvas.translate(cl - sx, ct - sy); 2403 } else { 2404 canvas.translate(cl, ct); 2405 if (scalingRequired) { 2406 // mAttachInfo cannot be null, otherwise scalingRequired == false 2407 final float scale = 1.0f / mAttachInfo.mApplicationScale; 2408 canvas.scale(scale, scale); 2409 } 2410 } 2411 2412 boolean layerSaved = false; 2413 2414 if (transformToApply != null || alpha < 1.0f || !child.hasIdentityMatrix()) { 2415 if (transformToApply != null || !childHasIdentityMatrix) { 2416 int transX = 0; 2417 int transY = 0; 2418 2419 if (cache == null && !hasDisplayList) { 2420 transX = -sx; 2421 transY = -sy; 2422 } 2423 2424 if (transformToApply != null) { 2425 if (concatMatrix) { 2426 // Undo the scroll translation, apply the transformation matrix, 2427 // then redo the scroll translate to get the correct result. 2428 canvas.translate(-transX, -transY); 2429 canvas.concat(transformToApply.getMatrix()); 2430 canvas.translate(transX, transY); 2431 mGroupFlags |= FLAG_CLEAR_TRANSFORMATION; 2432 } 2433 2434 float transformAlpha = transformToApply.getAlpha(); 2435 if (transformAlpha < 1.0f) { 2436 alpha *= transformToApply.getAlpha(); 2437 mGroupFlags |= FLAG_CLEAR_TRANSFORMATION; 2438 } 2439 } 2440 2441 if (!childHasIdentityMatrix) { 2442 canvas.translate(-transX, -transY); 2443 canvas.concat(child.getMatrix()); 2444 canvas.translate(transX, transY); 2445 } 2446 } 2447 2448 if (alpha < 1.0f) { 2449 mGroupFlags |= FLAG_CLEAR_TRANSFORMATION; 2450 if (hasNoCache) { 2451 final int multipliedAlpha = (int) (255 * alpha); 2452 if (!child.onSetAlpha(multipliedAlpha)) { 2453 int layerFlags = Canvas.HAS_ALPHA_LAYER_SAVE_FLAG; 2454 if ((flags & FLAG_CLIP_CHILDREN) == FLAG_CLIP_CHILDREN || 2455 layerType != LAYER_TYPE_NONE) { 2456 layerFlags |= Canvas.CLIP_TO_LAYER_SAVE_FLAG; 2457 } 2458 if (layerType != LAYER_TYPE_NONE) { 2459 child.mLayerPaint.setAlpha(multipliedAlpha); 2460 } else { 2461 canvas.saveLayerAlpha(sx, sy, sx + cr - cl, sy + cb - ct, 2462 multipliedAlpha, layerFlags); 2463 } 2464 } else { 2465 // Alpha is handled by the child directly, clobber the layer's alpha 2466 if (layerType != LAYER_TYPE_NONE) { 2467 child.mLayerPaint.setAlpha(255); 2468 } 2469 child.mPrivateFlags |= ALPHA_SET; 2470 } 2471 } 2472 } 2473 } else if ((child.mPrivateFlags & ALPHA_SET) == ALPHA_SET) { 2474 child.onSetAlpha(255); 2475 child.mPrivateFlags &= ~ALPHA_SET; 2476 } 2477 2478 if ((flags & FLAG_CLIP_CHILDREN) == FLAG_CLIP_CHILDREN) { 2479 if (cache == null && !hasDisplayList) { 2480 canvas.clipRect(sx, sy, sx + (cr - cl), sy + (cb - ct)); 2481 } else { 2482 if (!scalingRequired || cache == null) { 2483 canvas.clipRect(0, 0, cr - cl, cb - ct); 2484 } else { 2485 canvas.clipRect(0, 0, cache.getWidth(), cache.getHeight()); 2486 } 2487 } 2488 } 2489 2490 if (hasNoCache) { 2491 boolean layerRendered = false; 2492 if (layerType == LAYER_TYPE_HARDWARE) { 2493 final HardwareLayer layer = child.getHardwareLayer(canvas); 2494 if (layer != null && layer.isValid()) { 2495 ((HardwareCanvas) canvas).drawHardwareLayer(layer, 0, 0, child.mLayerPaint); 2496 layerRendered = true; 2497 } else { 2498 canvas.saveLayer(sx, sy, sx + cr - cl, sy + cb - ct, child.mLayerPaint, 2499 Canvas.HAS_ALPHA_LAYER_SAVE_FLAG | Canvas.CLIP_TO_LAYER_SAVE_FLAG); 2500 } 2501 } 2502 2503 if (!layerRendered) { 2504 if (!hasDisplayList) { 2505 // Fast path for layouts with no backgrounds 2506 if ((child.mPrivateFlags & SKIP_DRAW) == SKIP_DRAW) { 2507 if (ViewDebug.TRACE_HIERARCHY) { 2508 ViewDebug.trace(this, ViewDebug.HierarchyTraceType.DRAW); 2509 } 2510 child.mPrivateFlags &= ~DIRTY_MASK; 2511 child.dispatchDraw(canvas); 2512 } else { 2513 child.draw(canvas); 2514 } 2515 } else { 2516 child.mPrivateFlags &= ~DIRTY_MASK; 2517 // Skip drawing the display list into ours if we were just refreshing 2518 // it's content; we already have a reference to it in our display list 2519 if (mRecreateDisplayList || mLayerType != LAYER_TYPE_NONE) { 2520 ((HardwareCanvas) canvas).drawDisplayList(displayList); 2521 } 2522 } 2523 } 2524 } else if (cache != null) { 2525 child.mPrivateFlags &= ~DIRTY_MASK; 2526 Paint cachePaint; 2527 2528 if (layerType == LAYER_TYPE_NONE) { 2529 cachePaint = mCachePaint; 2530 if (alpha < 1.0f) { 2531 cachePaint.setAlpha((int) (alpha * 255)); 2532 mGroupFlags |= FLAG_ALPHA_LOWER_THAN_ONE; 2533 } else if ((flags & FLAG_ALPHA_LOWER_THAN_ONE) == FLAG_ALPHA_LOWER_THAN_ONE) { 2534 cachePaint.setAlpha(255); 2535 mGroupFlags &= ~FLAG_ALPHA_LOWER_THAN_ONE; 2536 } 2537 } else { 2538 cachePaint = child.mLayerPaint; 2539 cachePaint.setAlpha((int) (alpha * 255)); 2540 } 2541 canvas.drawBitmap(cache, 0.0f, 0.0f, cachePaint); 2542 } 2543 2544 canvas.restoreToCount(restoreTo); 2545 2546 if (a != null && !more) { 2547 child.onSetAlpha(255); 2548 finishAnimatingView(child, a); 2549 } 2550 2551 if (more && canvas.isHardwareAccelerated()) { 2552 // invalidation is the trigger to recreate display lists, so if we're using 2553 // display lists to render, force an invalidate to allow the animation to 2554 // continue drawing another frame 2555 invalidate(); 2556 } 2557 2558 child.mRecreateDisplayList = false; 2559 2560 return more; 2561 } 2562 2563 /** 2564 * By default, children are clipped to their bounds before drawing. This 2565 * allows view groups to override this behavior for animations, etc. 2566 * 2567 * @param clipChildren true to clip children to their bounds, 2568 * false otherwise 2569 * @attr ref android.R.styleable#ViewGroup_clipChildren 2570 */ 2571 public void setClipChildren(boolean clipChildren) { 2572 setBooleanFlag(FLAG_CLIP_CHILDREN, clipChildren); 2573 } 2574 2575 /** 2576 * By default, children are clipped to the padding of the ViewGroup. This 2577 * allows view groups to override this behavior 2578 * 2579 * @param clipToPadding true to clip children to the padding of the 2580 * group, false otherwise 2581 * @attr ref android.R.styleable#ViewGroup_clipToPadding 2582 */ 2583 public void setClipToPadding(boolean clipToPadding) { 2584 setBooleanFlag(FLAG_CLIP_TO_PADDING, clipToPadding); 2585 } 2586 2587 /** 2588 * {@inheritDoc} 2589 */ 2590 @Override 2591 public void dispatchSetSelected(boolean selected) { 2592 final View[] children = mChildren; 2593 final int count = mChildrenCount; 2594 for (int i = 0; i < count; i++) { 2595 2596 children[i].setSelected(selected); 2597 } 2598 } 2599 2600 /** 2601 * {@inheritDoc} 2602 */ 2603 @Override 2604 public void dispatchSetActivated(boolean activated) { 2605 final View[] children = mChildren; 2606 final int count = mChildrenCount; 2607 for (int i = 0; i < count; i++) { 2608 2609 children[i].setActivated(activated); 2610 } 2611 } 2612 2613 @Override 2614 protected void dispatchSetPressed(boolean pressed) { 2615 final View[] children = mChildren; 2616 final int count = mChildrenCount; 2617 for (int i = 0; i < count; i++) { 2618 children[i].setPressed(pressed); 2619 } 2620 } 2621 2622 /** 2623 * When this property is set to true, this ViewGroup supports static transformations on 2624 * children; this causes 2625 * {@link #getChildStaticTransformation(View, android.view.animation.Transformation)} to be 2626 * invoked when a child is drawn. 2627 * 2628 * Any subclass overriding 2629 * {@link #getChildStaticTransformation(View, android.view.animation.Transformation)} should 2630 * set this property to true. 2631 * 2632 * @param enabled True to enable static transformations on children, false otherwise. 2633 * 2634 * @see #FLAG_SUPPORT_STATIC_TRANSFORMATIONS 2635 */ 2636 protected void setStaticTransformationsEnabled(boolean enabled) { 2637 setBooleanFlag(FLAG_SUPPORT_STATIC_TRANSFORMATIONS, enabled); 2638 } 2639 2640 /** 2641 * {@inheritDoc} 2642 * 2643 * @see #setStaticTransformationsEnabled(boolean) 2644 */ 2645 protected boolean getChildStaticTransformation(View child, Transformation t) { 2646 return false; 2647 } 2648 2649 /** 2650 * {@hide} 2651 */ 2652 @Override 2653 protected View findViewTraversal(int id) { 2654 if (id == mID) { 2655 return this; 2656 } 2657 2658 final View[] where = mChildren; 2659 final int len = mChildrenCount; 2660 2661 for (int i = 0; i < len; i++) { 2662 View v = where[i]; 2663 2664 if ((v.mPrivateFlags & IS_ROOT_NAMESPACE) == 0) { 2665 v = v.findViewById(id); 2666 2667 if (v != null) { 2668 return v; 2669 } 2670 } 2671 } 2672 2673 return null; 2674 } 2675 2676 /** 2677 * {@hide} 2678 */ 2679 @Override 2680 protected View findViewWithTagTraversal(Object tag) { 2681 if (tag != null && tag.equals(mTag)) { 2682 return this; 2683 } 2684 2685 final View[] where = mChildren; 2686 final int len = mChildrenCount; 2687 2688 for (int i = 0; i < len; i++) { 2689 View v = where[i]; 2690 2691 if ((v.mPrivateFlags & IS_ROOT_NAMESPACE) == 0) { 2692 v = v.findViewWithTag(tag); 2693 2694 if (v != null) { 2695 return v; 2696 } 2697 } 2698 } 2699 2700 return null; 2701 } 2702 2703 /** 2704 * {@hide} 2705 */ 2706 @Override 2707 protected View findViewByPredicateTraversal(Predicate<View> predicate) { 2708 if (predicate.apply(this)) { 2709 return this; 2710 } 2711 2712 final View[] where = mChildren; 2713 final int len = mChildrenCount; 2714 2715 for (int i = 0; i < len; i++) { 2716 View v = where[i]; 2717 2718 if ((v.mPrivateFlags & IS_ROOT_NAMESPACE) == 0) { 2719 v = v.findViewByPredicate(predicate); 2720 2721 if (v != null) { 2722 return v; 2723 } 2724 } 2725 } 2726 2727 return null; 2728 } 2729 2730 /** 2731 * Adds a child view. If no layout parameters are already set on the child, the 2732 * default parameters for this ViewGroup are set on the child. 2733 * 2734 * @param child the child view to add 2735 * 2736 * @see #generateDefaultLayoutParams() 2737 */ 2738 public void addView(View child) { 2739 addView(child, -1); 2740 } 2741 2742 /** 2743 * Adds a child view. If no layout parameters are already set on the child, the 2744 * default parameters for this ViewGroup are set on the child. 2745 * 2746 * @param child the child view to add 2747 * @param index the position at which to add the child 2748 * 2749 * @see #generateDefaultLayoutParams() 2750 */ 2751 public void addView(View child, int index) { 2752 LayoutParams params = child.getLayoutParams(); 2753 if (params == null) { 2754 params = generateDefaultLayoutParams(); 2755 if (params == null) { 2756 throw new IllegalArgumentException("generateDefaultLayoutParams() cannot return null"); 2757 } 2758 } 2759 addView(child, index, params); 2760 } 2761 2762 /** 2763 * Adds a child view with this ViewGroup's default layout parameters and the 2764 * specified width and height. 2765 * 2766 * @param child the child view to add 2767 */ 2768 public void addView(View child, int width, int height) { 2769 final LayoutParams params = generateDefaultLayoutParams(); 2770 params.width = width; 2771 params.height = height; 2772 addView(child, -1, params); 2773 } 2774 2775 /** 2776 * Adds a child view with the specified layout parameters. 2777 * 2778 * @param child the child view to add 2779 * @param params the layout parameters to set on the child 2780 */ 2781 public void addView(View child, LayoutParams params) { 2782 addView(child, -1, params); 2783 } 2784 2785 /** 2786 * Adds a child view with the specified layout parameters. 2787 * 2788 * @param child the child view to add 2789 * @param index the position at which to add the child 2790 * @param params the layout parameters to set on the child 2791 */ 2792 public void addView(View child, int index, LayoutParams params) { 2793 if (DBG) { 2794 System.out.println(this + " addView"); 2795 } 2796 2797 // addViewInner() will call child.requestLayout() when setting the new LayoutParams 2798 // therefore, we call requestLayout() on ourselves before, so that the child's request 2799 // will be blocked at our level 2800 requestLayout(); 2801 invalidate(); 2802 addViewInner(child, index, params, false); 2803 } 2804 2805 /** 2806 * {@inheritDoc} 2807 */ 2808 public void updateViewLayout(View view, ViewGroup.LayoutParams params) { 2809 if (!checkLayoutParams(params)) { 2810 throw new IllegalArgumentException("Invalid LayoutParams supplied to " + this); 2811 } 2812 if (view.mParent != this) { 2813 throw new IllegalArgumentException("Given view not a child of " + this); 2814 } 2815 view.setLayoutParams(params); 2816 } 2817 2818 /** 2819 * {@inheritDoc} 2820 */ 2821 protected boolean checkLayoutParams(ViewGroup.LayoutParams p) { 2822 return p != null; 2823 } 2824 2825 /** 2826 * Interface definition for a callback to be invoked when the hierarchy 2827 * within this view changed. The hierarchy changes whenever a child is added 2828 * to or removed from this view. 2829 */ 2830 public interface OnHierarchyChangeListener { 2831 /** 2832 * Called when a new child is added to a parent view. 2833 * 2834 * @param parent the view in which a child was added 2835 * @param child the new child view added in the hierarchy 2836 */ 2837 void onChildViewAdded(View parent, View child); 2838 2839 /** 2840 * Called when a child is removed from a parent view. 2841 * 2842 * @param parent the view from which the child was removed 2843 * @param child the child removed from the hierarchy 2844 */ 2845 void onChildViewRemoved(View parent, View child); 2846 } 2847 2848 /** 2849 * Register a callback to be invoked when a child is added to or removed 2850 * from this view. 2851 * 2852 * @param listener the callback to invoke on hierarchy change 2853 */ 2854 public void setOnHierarchyChangeListener(OnHierarchyChangeListener listener) { 2855 mOnHierarchyChangeListener = listener; 2856 } 2857 2858 /** 2859 * Adds a view during layout. This is useful if in your onLayout() method, 2860 * you need to add more views (as does the list view for example). 2861 * 2862 * If index is negative, it means put it at the end of the list. 2863 * 2864 * @param child the view to add to the group 2865 * @param index the index at which the child must be added 2866 * @param params the layout parameters to associate with the child 2867 * @return true if the child was added, false otherwise 2868 */ 2869 protected boolean addViewInLayout(View child, int index, LayoutParams params) { 2870 return addViewInLayout(child, index, params, false); 2871 } 2872 2873 /** 2874 * Adds a view during layout. This is useful if in your onLayout() method, 2875 * you need to add more views (as does the list view for example). 2876 * 2877 * If index is negative, it means put it at the end of the list. 2878 * 2879 * @param child the view to add to the group 2880 * @param index the index at which the child must be added 2881 * @param params the layout parameters to associate with the child 2882 * @param preventRequestLayout if true, calling this method will not trigger a 2883 * layout request on child 2884 * @return true if the child was added, false otherwise 2885 */ 2886 protected boolean addViewInLayout(View child, int index, LayoutParams params, 2887 boolean preventRequestLayout) { 2888 child.mParent = null; 2889 addViewInner(child, index, params, preventRequestLayout); 2890 child.mPrivateFlags = (child.mPrivateFlags & ~DIRTY_MASK) | DRAWN; 2891 return true; 2892 } 2893 2894 /** 2895 * Prevents the specified child to be laid out during the next layout pass. 2896 * 2897 * @param child the child on which to perform the cleanup 2898 */ 2899 protected void cleanupLayoutState(View child) { 2900 child.mPrivateFlags &= ~View.FORCE_LAYOUT; 2901 } 2902 2903 private void addViewInner(View child, int index, LayoutParams params, 2904 boolean preventRequestLayout) { 2905 2906 if (child.getParent() != null) { 2907 throw new IllegalStateException("The specified child already has a parent. " + 2908 "You must call removeView() on the child's parent first."); 2909 } 2910 2911 if (mTransition != null) { 2912 mTransition.addChild(this, child); 2913 } 2914 2915 if (!checkLayoutParams(params)) { 2916 params = generateLayoutParams(params); 2917 } 2918 2919 if (preventRequestLayout) { 2920 child.mLayoutParams = params; 2921 } else { 2922 child.setLayoutParams(params); 2923 } 2924 2925 if (index < 0) { 2926 index = mChildrenCount; 2927 } 2928 2929 addInArray(child, index); 2930 2931 // tell our children 2932 if (preventRequestLayout) { 2933 child.assignParent(this); 2934 } else { 2935 child.mParent = this; 2936 } 2937 2938 if (child.hasFocus()) { 2939 requestChildFocus(child, child.findFocus()); 2940 } 2941 2942 AttachInfo ai = mAttachInfo; 2943 if (ai != null) { 2944 boolean lastKeepOn = ai.mKeepScreenOn; 2945 ai.mKeepScreenOn = false; 2946 child.dispatchAttachedToWindow(mAttachInfo, (mViewFlags&VISIBILITY_MASK)); 2947 if (ai.mKeepScreenOn) { 2948 needGlobalAttributesUpdate(true); 2949 } 2950 ai.mKeepScreenOn = lastKeepOn; 2951 } 2952 2953 if (mOnHierarchyChangeListener != null) { 2954 mOnHierarchyChangeListener.onChildViewAdded(this, child); 2955 } 2956 2957 if ((child.mViewFlags & DUPLICATE_PARENT_STATE) == DUPLICATE_PARENT_STATE) { 2958 mGroupFlags |= FLAG_NOTIFY_CHILDREN_ON_DRAWABLE_STATE_CHANGE; 2959 } 2960 } 2961 2962 private void addInArray(View child, int index) { 2963 View[] children = mChildren; 2964 final int count = mChildrenCount; 2965 final int size = children.length; 2966 if (index == count) { 2967 if (size == count) { 2968 mChildren = new View[size + ARRAY_CAPACITY_INCREMENT]; 2969 System.arraycopy(children, 0, mChildren, 0, size); 2970 children = mChildren; 2971 } 2972 children[mChildrenCount++] = child; 2973 } else if (index < count) { 2974 if (size == count) { 2975 mChildren = new View[size + ARRAY_CAPACITY_INCREMENT]; 2976 System.arraycopy(children, 0, mChildren, 0, index); 2977 System.arraycopy(children, index, mChildren, index + 1, count - index); 2978 children = mChildren; 2979 } else { 2980 System.arraycopy(children, index, children, index + 1, count - index); 2981 } 2982 children[index] = child; 2983 mChildrenCount++; 2984 if (mLastTouchDownIndex >= index) { 2985 mLastTouchDownIndex++; 2986 } 2987 } else { 2988 throw new IndexOutOfBoundsException("index=" + index + " count=" + count); 2989 } 2990 } 2991 2992 // This method also sets the child's mParent to null 2993 private void removeFromArray(int index) { 2994 final View[] children = mChildren; 2995 if (!(mTransitioningViews != null && mTransitioningViews.contains(children[index]))) { 2996 children[index].mParent = null; 2997 } 2998 final int count = mChildrenCount; 2999 if (index == count - 1) { 3000 children[--mChildrenCount] = null; 3001 } else if (index >= 0 && index < count) { 3002 System.arraycopy(children, index + 1, children, index, count - index - 1); 3003 children[--mChildrenCount] = null; 3004 } else { 3005 throw new IndexOutOfBoundsException(); 3006 } 3007 if (mLastTouchDownIndex == index) { 3008 mLastTouchDownTime = 0; 3009 mLastTouchDownIndex = -1; 3010 } else if (mLastTouchDownIndex > index) { 3011 mLastTouchDownIndex--; 3012 } 3013 } 3014 3015 // This method also sets the children's mParent to null 3016 private void removeFromArray(int start, int count) { 3017 final View[] children = mChildren; 3018 final int childrenCount = mChildrenCount; 3019 3020 start = Math.max(0, start); 3021 final int end = Math.min(childrenCount, start + count); 3022 3023 if (start == end) { 3024 return; 3025 } 3026 3027 if (end == childrenCount) { 3028 for (int i = start; i < end; i++) { 3029 children[i].mParent = null; 3030 children[i] = null; 3031 } 3032 } else { 3033 for (int i = start; i < end; i++) { 3034 children[i].mParent = null; 3035 } 3036 3037 // Since we're looping above, we might as well do the copy, but is arraycopy() 3038 // faster than the extra 2 bounds checks we would do in the loop? 3039 System.arraycopy(children, end, children, start, childrenCount - end); 3040 3041 for (int i = childrenCount - (end - start); i < childrenCount; i++) { 3042 children[i] = null; 3043 } 3044 } 3045 3046 mChildrenCount -= (end - start); 3047 } 3048 3049 private void bindLayoutAnimation(View child) { 3050 Animation a = mLayoutAnimationController.getAnimationForView(child); 3051 child.setAnimation(a); 3052 } 3053 3054 /** 3055 * Subclasses should override this method to set layout animation 3056 * parameters on the supplied child. 3057 * 3058 * @param child the child to associate with animation parameters 3059 * @param params the child's layout parameters which hold the animation 3060 * parameters 3061 * @param index the index of the child in the view group 3062 * @param count the number of children in the view group 3063 */ 3064 protected void attachLayoutAnimationParameters(View child, 3065 LayoutParams params, int index, int count) { 3066 LayoutAnimationController.AnimationParameters animationParams = 3067 params.layoutAnimationParameters; 3068 if (animationParams == null) { 3069 animationParams = new LayoutAnimationController.AnimationParameters(); 3070 params.layoutAnimationParameters = animationParams; 3071 } 3072 3073 animationParams.count = count; 3074 animationParams.index = index; 3075 } 3076 3077 /** 3078 * {@inheritDoc} 3079 */ 3080 public void removeView(View view) { 3081 removeViewInternal(view); 3082 requestLayout(); 3083 invalidate(); 3084 } 3085 3086 /** 3087 * Removes a view during layout. This is useful if in your onLayout() method, 3088 * you need to remove more views. 3089 * 3090 * @param view the view to remove from the group 3091 */ 3092 public void removeViewInLayout(View view) { 3093 removeViewInternal(view); 3094 } 3095 3096 /** 3097 * Removes a range of views during layout. This is useful if in your onLayout() method, 3098 * you need to remove more views. 3099 * 3100 * @param start the index of the first view to remove from the group 3101 * @param count the number of views to remove from the group 3102 */ 3103 public void removeViewsInLayout(int start, int count) { 3104 removeViewsInternal(start, count); 3105 } 3106 3107 /** 3108 * Removes the view at the specified position in the group. 3109 * 3110 * @param index the position in the group of the view to remove 3111 */ 3112 public void removeViewAt(int index) { 3113 removeViewInternal(index, getChildAt(index)); 3114 requestLayout(); 3115 invalidate(); 3116 } 3117 3118 /** 3119 * Removes the specified range of views from the group. 3120 * 3121 * @param start the first position in the group of the range of views to remove 3122 * @param count the number of views to remove 3123 */ 3124 public void removeViews(int start, int count) { 3125 removeViewsInternal(start, count); 3126 requestLayout(); 3127 invalidate(); 3128 } 3129 3130 private void removeViewInternal(View view) { 3131 final int index = indexOfChild(view); 3132 if (index >= 0) { 3133 removeViewInternal(index, view); 3134 } 3135 } 3136 3137 private void removeViewInternal(int index, View view) { 3138 3139 if (mTransition != null) { 3140 mTransition.removeChild(this, view); 3141 } 3142 3143 boolean clearChildFocus = false; 3144 if (view == mFocused) { 3145 view.clearFocusForRemoval(); 3146 clearChildFocus = true; 3147 } 3148 3149 if (view.getAnimation() != null || 3150 (mTransitioningViews != null && mTransitioningViews.contains(view))) { 3151 addDisappearingView(view); 3152 } else if (view.mAttachInfo != null) { 3153 view.dispatchDetachedFromWindow(); 3154 } 3155 3156 if (mOnHierarchyChangeListener != null) { 3157 mOnHierarchyChangeListener.onChildViewRemoved(this, view); 3158 } 3159 3160 needGlobalAttributesUpdate(false); 3161 3162 removeFromArray(index); 3163 3164 if (clearChildFocus) { 3165 clearChildFocus(view); 3166 } 3167 } 3168 3169 /** 3170 * Sets the LayoutTransition object for this ViewGroup. If the LayoutTransition object is 3171 * not null, changes in layout which occur because of children being added to or removed from 3172 * the ViewGroup will be animated according to the animations defined in that LayoutTransition 3173 * object. By default, the transition object is null (so layout changes are not animated). 3174 * 3175 * @param transition The LayoutTransition object that will animated changes in layout. A value 3176 * of <code>null</code> means no transition will run on layout changes. 3177 * @attr ref android.R.styleable#ViewGroup_animateLayoutChanges 3178 */ 3179 public void setLayoutTransition(LayoutTransition transition) { 3180 if (mTransition != null) { 3181 mTransition.removeTransitionListener(mLayoutTransitionListener); 3182 } 3183 mTransition = transition; 3184 if (mTransition != null) { 3185 mTransition.addTransitionListener(mLayoutTransitionListener); 3186 } 3187 } 3188 3189 /** 3190 * Gets the LayoutTransition object for this ViewGroup. If the LayoutTransition object is 3191 * not null, changes in layout which occur because of children being added to or removed from 3192 * the ViewGroup will be animated according to the animations defined in that LayoutTransition 3193 * object. By default, the transition object is null (so layout changes are not animated). 3194 * 3195 * @return LayoutTranstion The LayoutTransition object that will animated changes in layout. 3196 * A value of <code>null</code> means no transition will run on layout changes. 3197 */ 3198 public LayoutTransition getLayoutTransition() { 3199 return mTransition; 3200 } 3201 3202 private void removeViewsInternal(int start, int count) { 3203 final OnHierarchyChangeListener onHierarchyChangeListener = mOnHierarchyChangeListener; 3204 final boolean notifyListener = onHierarchyChangeListener != null; 3205 final View focused = mFocused; 3206 final boolean detach = mAttachInfo != null; 3207 View clearChildFocus = null; 3208 3209 final View[] children = mChildren; 3210 final int end = start + count; 3211 3212 for (int i = start; i < end; i++) { 3213 final View view = children[i]; 3214 3215 if (mTransition != null) { 3216 mTransition.removeChild(this, view); 3217 } 3218 3219 if (view == focused) { 3220 view.clearFocusForRemoval(); 3221 clearChildFocus = view; 3222 } 3223 3224 if (view.getAnimation() != null || 3225 (mTransitioningViews != null && mTransitioningViews.contains(view))) { 3226 addDisappearingView(view); 3227 } else if (detach) { 3228 view.dispatchDetachedFromWindow(); 3229 } 3230 3231 needGlobalAttributesUpdate(false); 3232 3233 if (notifyListener) { 3234 onHierarchyChangeListener.onChildViewRemoved(this, view); 3235 } 3236 } 3237 3238 removeFromArray(start, count); 3239 3240 if (clearChildFocus != null) { 3241 clearChildFocus(clearChildFocus); 3242 } 3243 } 3244 3245 /** 3246 * Call this method to remove all child views from the 3247 * ViewGroup. 3248 */ 3249 public void removeAllViews() { 3250 removeAllViewsInLayout(); 3251 requestLayout(); 3252 invalidate(); 3253 } 3254 3255 /** 3256 * Called by a ViewGroup subclass to remove child views from itself, 3257 * when it must first know its size on screen before it can calculate how many 3258 * child views it will render. An example is a Gallery or a ListView, which 3259 * may "have" 50 children, but actually only render the number of children 3260 * that can currently fit inside the object on screen. Do not call 3261 * this method unless you are extending ViewGroup and understand the 3262 * view measuring and layout pipeline. 3263 */ 3264 public void removeAllViewsInLayout() { 3265 final int count = mChildrenCount; 3266 if (count <= 0) { 3267 return; 3268 } 3269 3270 final View[] children = mChildren; 3271 mChildrenCount = 0; 3272 3273 final OnHierarchyChangeListener listener = mOnHierarchyChangeListener; 3274 final boolean notify = listener != null; 3275 final View focused = mFocused; 3276 final boolean detach = mAttachInfo != null; 3277 View clearChildFocus = null; 3278 3279 needGlobalAttributesUpdate(false); 3280 3281 for (int i = count - 1; i >= 0; i--) { 3282 final View view = children[i]; 3283 3284 if (mTransition != null) { 3285 mTransition.removeChild(this, view); 3286 } 3287 3288 if (view == focused) { 3289 view.clearFocusForRemoval(); 3290 clearChildFocus = view; 3291 } 3292 3293 if (view.getAnimation() != null || 3294 (mTransitioningViews != null && mTransitioningViews.contains(view))) { 3295 addDisappearingView(view); 3296 } else if (detach) { 3297 view.dispatchDetachedFromWindow(); 3298 } 3299 3300 if (notify) { 3301 listener.onChildViewRemoved(this, view); 3302 } 3303 3304 view.mParent = null; 3305 children[i] = null; 3306 } 3307 3308 if (clearChildFocus != null) { 3309 clearChildFocus(clearChildFocus); 3310 } 3311 } 3312 3313 /** 3314 * Finishes the removal of a detached view. This method will dispatch the detached from 3315 * window event and notify the hierarchy change listener. 3316 * 3317 * @param child the child to be definitely removed from the view hierarchy 3318 * @param animate if true and the view has an animation, the view is placed in the 3319 * disappearing views list, otherwise, it is detached from the window 3320 * 3321 * @see #attachViewToParent(View, int, android.view.ViewGroup.LayoutParams) 3322 * @see #detachAllViewsFromParent() 3323 * @see #detachViewFromParent(View) 3324 * @see #detachViewFromParent(int) 3325 */ 3326 protected void removeDetachedView(View child, boolean animate) { 3327 if (mTransition != null) { 3328 mTransition.removeChild(this, child); 3329 } 3330 3331 if (child == mFocused) { 3332 child.clearFocus(); 3333 } 3334 3335 if ((animate && child.getAnimation() != null) || 3336 (mTransitioningViews != null && mTransitioningViews.contains(child))) { 3337 addDisappearingView(child); 3338 } else if (child.mAttachInfo != null) { 3339 child.dispatchDetachedFromWindow(); 3340 } 3341 3342 if (mOnHierarchyChangeListener != null) { 3343 mOnHierarchyChangeListener.onChildViewRemoved(this, child); 3344 } 3345 } 3346 3347 /** 3348 * Attaches a view to this view group. Attaching a view assigns this group as the parent, 3349 * sets the layout parameters and puts the view in the list of children so it can be retrieved 3350 * by calling {@link #getChildAt(int)}. 3351 * 3352 * This method should be called only for view which were detached from their parent. 3353 * 3354 * @param child the child to attach 3355 * @param index the index at which the child should be attached 3356 * @param params the layout parameters of the child 3357 * 3358 * @see #removeDetachedView(View, boolean) 3359 * @see #detachAllViewsFromParent() 3360 * @see #detachViewFromParent(View) 3361 * @see #detachViewFromParent(int) 3362 */ 3363 protected void attachViewToParent(View child, int index, LayoutParams params) { 3364 child.mLayoutParams = params; 3365 3366 if (index < 0) { 3367 index = mChildrenCount; 3368 } 3369 3370 addInArray(child, index); 3371 3372 child.mParent = this; 3373 child.mPrivateFlags = (child.mPrivateFlags & ~DIRTY_MASK & ~DRAWING_CACHE_VALID) | 3374 DRAWN | INVALIDATED; 3375 this.mPrivateFlags |= INVALIDATED; 3376 3377 if (child.hasFocus()) { 3378 requestChildFocus(child, child.findFocus()); 3379 } 3380 } 3381 3382 /** 3383 * Detaches a view from its parent. Detaching a view should be temporary and followed 3384 * either by a call to {@link #attachViewToParent(View, int, android.view.ViewGroup.LayoutParams)} 3385 * or a call to {@link #removeDetachedView(View, boolean)}. When a view is detached, 3386 * its parent is null and cannot be retrieved by a call to {@link #getChildAt(int)}. 3387 * 3388 * @param child the child to detach 3389 * 3390 * @see #detachViewFromParent(int) 3391 * @see #detachViewsFromParent(int, int) 3392 * @see #detachAllViewsFromParent() 3393 * @see #attachViewToParent(View, int, android.view.ViewGroup.LayoutParams) 3394 * @see #removeDetachedView(View, boolean) 3395 */ 3396 protected void detachViewFromParent(View child) { 3397 removeFromArray(indexOfChild(child)); 3398 } 3399 3400 /** 3401 * Detaches a view from its parent. Detaching a view should be temporary and followed 3402 * either by a call to {@link #attachViewToParent(View, int, android.view.ViewGroup.LayoutParams)} 3403 * or a call to {@link #removeDetachedView(View, boolean)}. When a view is detached, 3404 * its parent is null and cannot be retrieved by a call to {@link #getChildAt(int)}. 3405 * 3406 * @param index the index of the child to detach 3407 * 3408 * @see #detachViewFromParent(View) 3409 * @see #detachAllViewsFromParent() 3410 * @see #detachViewsFromParent(int, int) 3411 * @see #attachViewToParent(View, int, android.view.ViewGroup.LayoutParams) 3412 * @see #removeDetachedView(View, boolean) 3413 */ 3414 protected void detachViewFromParent(int index) { 3415 removeFromArray(index); 3416 } 3417 3418 /** 3419 * Detaches a range of view from their parent. Detaching a view should be temporary and followed 3420 * either by a call to {@link #attachViewToParent(View, int, android.view.ViewGroup.LayoutParams)} 3421 * or a call to {@link #removeDetachedView(View, boolean)}. When a view is detached, its 3422 * parent is null and cannot be retrieved by a call to {@link #getChildAt(int)}. 3423 * 3424 * @param start the first index of the childrend range to detach 3425 * @param count the number of children to detach 3426 * 3427 * @see #detachViewFromParent(View) 3428 * @see #detachViewFromParent(int) 3429 * @see #detachAllViewsFromParent() 3430 * @see #attachViewToParent(View, int, android.view.ViewGroup.LayoutParams) 3431 * @see #removeDetachedView(View, boolean) 3432 */ 3433 protected void detachViewsFromParent(int start, int count) { 3434 removeFromArray(start, count); 3435 } 3436 3437 /** 3438 * Detaches all views from the parent. Detaching a view should be temporary and followed 3439 * either by a call to {@link #attachViewToParent(View, int, android.view.ViewGroup.LayoutParams)} 3440 * or a call to {@link #removeDetachedView(View, boolean)}. When a view is detached, 3441 * its parent is null and cannot be retrieved by a call to {@link #getChildAt(int)}. 3442 * 3443 * @see #detachViewFromParent(View) 3444 * @see #detachViewFromParent(int) 3445 * @see #detachViewsFromParent(int, int) 3446 * @see #attachViewToParent(View, int, android.view.ViewGroup.LayoutParams) 3447 * @see #removeDetachedView(View, boolean) 3448 */ 3449 protected void detachAllViewsFromParent() { 3450 final int count = mChildrenCount; 3451 if (count <= 0) { 3452 return; 3453 } 3454 3455 final View[] children = mChildren; 3456 mChildrenCount = 0; 3457 3458 for (int i = count - 1; i >= 0; i--) { 3459 children[i].mParent = null; 3460 children[i] = null; 3461 } 3462 } 3463 3464 /** 3465 * Don't call or override this method. It is used for the implementation of 3466 * the view hierarchy. 3467 */ 3468 public final void invalidateChild(View child, final Rect dirty) { 3469 if (ViewDebug.TRACE_HIERARCHY) { 3470 ViewDebug.trace(this, ViewDebug.HierarchyTraceType.INVALIDATE_CHILD); 3471 } 3472 3473 ViewParent parent = this; 3474 3475 final AttachInfo attachInfo = mAttachInfo; 3476 if (attachInfo != null) { 3477 // If the child is drawing an animation, we want to copy this flag onto 3478 // ourselves and the parent to make sure the invalidate request goes 3479 // through 3480 final boolean drawAnimation = (child.mPrivateFlags & DRAW_ANIMATION) == DRAW_ANIMATION; 3481 3482 if (dirty == null) { 3483 if (child.mLayerType != LAYER_TYPE_NONE) { 3484 mPrivateFlags |= INVALIDATED; 3485 mPrivateFlags &= ~DRAWING_CACHE_VALID; 3486 } 3487 do { 3488 View view = null; 3489 if (parent instanceof View) { 3490 view = (View) parent; 3491 if (view.mLayerType != LAYER_TYPE_NONE && 3492 view.getParent() instanceof View) { 3493 final View grandParent = (View) view.getParent(); 3494 grandParent.mPrivateFlags |= INVALIDATED; 3495 grandParent.mPrivateFlags &= ~DRAWING_CACHE_VALID; 3496 } 3497 if ((view.mPrivateFlags & DIRTY_MASK) != 0) { 3498 // already marked dirty - we're done 3499 break; 3500 } 3501 } 3502 3503 if (drawAnimation) { 3504 if (view != null) { 3505 view.mPrivateFlags |= DRAW_ANIMATION; 3506 } else if (parent instanceof ViewRoot) { 3507 ((ViewRoot) parent).mIsAnimating = true; 3508 } 3509 } 3510 3511 if (parent instanceof ViewRoot) { 3512 ((ViewRoot) parent).invalidate(); 3513 parent = null; 3514 } else if (view != null) { 3515 if ((mPrivateFlags & DRAWN) == DRAWN) { 3516 view.mPrivateFlags &= ~DRAWING_CACHE_VALID; 3517 view.mPrivateFlags |= DIRTY; 3518 parent = view.mParent; 3519 } else { 3520 parent = null; 3521 } 3522 } 3523 } while (parent != null); 3524 } else { 3525 // Check whether the child that requests the invalidate is fully opaque 3526 final boolean isOpaque = child.isOpaque() && !drawAnimation && 3527 child.getAnimation() == null; 3528 // Mark the child as dirty, using the appropriate flag 3529 // Make sure we do not set both flags at the same time 3530 int opaqueFlag = isOpaque ? DIRTY_OPAQUE : DIRTY; 3531 3532 final int[] location = attachInfo.mInvalidateChildLocation; 3533 location[CHILD_LEFT_INDEX] = child.mLeft; 3534 location[CHILD_TOP_INDEX] = child.mTop; 3535 Matrix childMatrix = child.getMatrix(); 3536 if (!childMatrix.isIdentity()) { 3537 RectF boundingRect = attachInfo.mTmpTransformRect; 3538 boundingRect.set(dirty); 3539 childMatrix.mapRect(boundingRect); 3540 dirty.set((int) boundingRect.left, (int) boundingRect.top, 3541 (int) (boundingRect.right + 0.5f), 3542 (int) (boundingRect.bottom + 0.5f)); 3543 } 3544 3545 if (child.mLayerType != LAYER_TYPE_NONE) { 3546 mPrivateFlags |= INVALIDATED; 3547 mPrivateFlags &= ~DRAWING_CACHE_VALID; 3548 } 3549 do { 3550 View view = null; 3551 if (parent instanceof View) { 3552 view = (View) parent; 3553 if (view.mLayerType != LAYER_TYPE_NONE && 3554 view.getParent() instanceof View) { 3555 final View grandParent = (View) view.getParent(); 3556 grandParent.mPrivateFlags |= INVALIDATED; 3557 grandParent.mPrivateFlags &= ~DRAWING_CACHE_VALID; 3558 } 3559 } 3560 3561 if (drawAnimation) { 3562 if (view != null) { 3563 view.mPrivateFlags |= DRAW_ANIMATION; 3564 } else if (parent instanceof ViewRoot) { 3565 ((ViewRoot) parent).mIsAnimating = true; 3566 } 3567 } 3568 3569 // If the parent is dirty opaque or not dirty, mark it dirty with the opaque 3570 // flag coming from the child that initiated the invalidate 3571 if (view != null) { 3572 if ((view.mViewFlags & FADING_EDGE_MASK) != 0 && 3573 view.getSolidColor() == 0 && !view.isOpaque()) { 3574 opaqueFlag = DIRTY; 3575 } 3576 if ((view.mPrivateFlags & DIRTY_MASK) != DIRTY) { 3577 view.mPrivateFlags = (view.mPrivateFlags & ~DIRTY_MASK) | opaqueFlag; 3578 } 3579 } 3580 3581 parent = parent.invalidateChildInParent(location, dirty); 3582 if (view != null) { 3583 // Account for transform on current parent 3584 Matrix m = view.getMatrix(); 3585 if (!m.isIdentity()) { 3586 RectF boundingRect = attachInfo.mTmpTransformRect; 3587 boundingRect.set(dirty); 3588 m.mapRect(boundingRect); 3589 dirty.set((int) boundingRect.left, (int) boundingRect.top, 3590 (int) (boundingRect.right + 0.5f), 3591 (int) (boundingRect.bottom + 0.5f)); 3592 } 3593 } 3594 } while (parent != null); 3595 } 3596 } 3597 } 3598 3599 /** 3600 * Don't call or override this method. It is used for the implementation of 3601 * the view hierarchy. 3602 * 3603 * This implementation returns null if this ViewGroup does not have a parent, 3604 * if this ViewGroup is already fully invalidated or if the dirty rectangle 3605 * does not intersect with this ViewGroup's bounds. 3606 */ 3607 public ViewParent invalidateChildInParent(final int[] location, final Rect dirty) { 3608 if (ViewDebug.TRACE_HIERARCHY) { 3609 ViewDebug.trace(this, ViewDebug.HierarchyTraceType.INVALIDATE_CHILD_IN_PARENT); 3610 } 3611 3612 if ((mPrivateFlags & DRAWN) == DRAWN) { 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