ViewGroup.java revision 5e7f766e99c679110fa95501728bb81a8e396e58
1/* 2 * Copyright (C) 2006 The Android Open Source Project 3 * 4 * Licensed under the Apache License, Version 2.0 (the "License"); 5 * you may not use this file except in compliance with the License. 6 * You may obtain a copy of the License at 7 * 8 * http://www.apache.org/licenses/LICENSE-2.0 9 * 10 * Unless required by applicable law or agreed to in writing, software 11 * distributed under the License is distributed on an "AS IS" BASIS, 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 13 * See the License for the specific language governing permissions and 14 * limitations under the License. 15 */ 16 17package android.view; 18 19import android.animation.LayoutTransition; 20import com.android.internal.R; 21import com.android.internal.util.Predicate; 22 23import android.content.Context; 24import android.content.res.Configuration; 25import android.content.res.TypedArray; 26import android.graphics.Bitmap; 27import android.graphics.Canvas; 28import android.graphics.Matrix; 29import android.graphics.Paint; 30import android.graphics.PointF; 31import android.graphics.Rect; 32import android.graphics.RectF; 33import android.graphics.Region; 34import android.os.Build; 35import android.os.Parcelable; 36import android.os.SystemClock; 37import android.util.AttributeSet; 38import android.util.Log; 39import android.util.SparseArray; 40import android.view.accessibility.AccessibilityEvent; 41import android.view.animation.Animation; 42import android.view.animation.AnimationUtils; 43import android.view.animation.LayoutAnimationController; 44import android.view.animation.Transformation; 45 46import java.util.ArrayList; 47import java.util.HashSet; 48 49/** 50 * <p> 51 * A <code>ViewGroup</code> is a special view that can contain other views 52 * (called children.) The view group is the base class for layouts and views 53 * containers. This class also defines the 54 * {@link android.view.ViewGroup.LayoutParams} class which serves as the base 55 * class for layouts parameters. 56 * </p> 57 * 58 * <p> 59 * Also see {@link LayoutParams} for layout attributes. 60 * </p> 61 * 62 * @attr ref android.R.styleable#ViewGroup_clipChildren 63 * @attr ref android.R.styleable#ViewGroup_clipToPadding 64 * @attr ref android.R.styleable#ViewGroup_layoutAnimation 65 * @attr ref android.R.styleable#ViewGroup_animationCache 66 * @attr ref android.R.styleable#ViewGroup_persistentDrawingCache 67 * @attr ref android.R.styleable#ViewGroup_alwaysDrawnWithCache 68 * @attr ref android.R.styleable#ViewGroup_addStatesFromChildren 69 * @attr ref android.R.styleable#ViewGroup_descendantFocusability 70 * @attr ref android.R.styleable#ViewGroup_animateLayoutChanges 71 */ 72public abstract class ViewGroup extends View implements ViewParent, ViewManager { 73 74 private static final boolean DBG = false; 75 76 /** 77 * Views which have been hidden or removed which need to be animated on 78 * their way out. 79 * This field should be made private, so it is hidden from the SDK. 80 * {@hide} 81 */ 82 protected ArrayList<View> mDisappearingChildren; 83 84 /** 85 * Listener used to propagate events indicating when children are added 86 * and/or removed from a view group. 87 * This field should be made private, so it is hidden from the SDK. 88 * {@hide} 89 */ 90 protected OnHierarchyChangeListener mOnHierarchyChangeListener; 91 92 // The view contained within this ViewGroup that has or contains focus. 93 private View mFocused; 94 95 /** 96 * A Transformation used when drawing children, to 97 * apply on the child being drawn. 98 */ 99 private final Transformation mChildTransformation = new Transformation(); 100 101 /** 102 * Used to track the current invalidation region. 103 */ 104 private RectF mInvalidateRegion; 105 106 /** 107 * A Transformation used to calculate a correct 108 * invalidation area when the application is autoscaled. 109 */ 110 private Transformation mInvalidationTransformation; 111 112 // View currently under an ongoing drag 113 private View mCurrentDragView; 114 115 // Metadata about the ongoing drag 116 private DragEvent mCurrentDrag; 117 private HashSet<View> mDragNotifiedChildren; 118 119 // Does this group have a child that can accept the current drag payload? 120 private boolean mChildAcceptsDrag; 121 122 // Used during drag dispatch 123 private final PointF mLocalPoint = new PointF(); 124 125 // Layout animation 126 private LayoutAnimationController mLayoutAnimationController; 127 private Animation.AnimationListener mAnimationListener; 128 129 // First touch target in the linked list of touch targets. 130 private TouchTarget mFirstTouchTarget; 131 132 // Temporary arrays for splitting pointers. 133 private int[] mTmpPointerIndexMap; 134 private int[] mTmpPointerIds; 135 private MotionEvent.PointerCoords[] mTmpPointerCoords; 136 137 // For debugging only. You can see these in hierarchyviewer. 138 @SuppressWarnings({"FieldCanBeLocal", "UnusedDeclaration"}) 139 @ViewDebug.ExportedProperty(category = "events") 140 private long mLastTouchDownTime; 141 @ViewDebug.ExportedProperty(category = "events") 142 private int mLastTouchDownIndex = -1; 143 @SuppressWarnings({"FieldCanBeLocal", "UnusedDeclaration"}) 144 @ViewDebug.ExportedProperty(category = "events") 145 private float mLastTouchDownX; 146 @SuppressWarnings({"FieldCanBeLocal", "UnusedDeclaration"}) 147 @ViewDebug.ExportedProperty(category = "events") 148 private float mLastTouchDownY; 149 150 /** 151 * Internal flags. 152 * 153 * This field should be made private, so it is hidden from the SDK. 154 * {@hide} 155 */ 156 protected int mGroupFlags; 157 158 // When set, ViewGroup invalidates only the child's rectangle 159 // Set by default 160 private static final int FLAG_CLIP_CHILDREN = 0x1; 161 162 // When set, ViewGroup excludes the padding area from the invalidate rectangle 163 // Set by default 164 private static final int FLAG_CLIP_TO_PADDING = 0x2; 165 166 // When set, dispatchDraw() will invoke invalidate(); this is set by drawChild() when 167 // a child needs to be invalidated and FLAG_OPTIMIZE_INVALIDATE is set 168 private static final int FLAG_INVALIDATE_REQUIRED = 0x4; 169 170 // When set, dispatchDraw() will run the layout animation and unset the flag 171 private static final int FLAG_RUN_ANIMATION = 0x8; 172 173 // When set, there is either no layout animation on the ViewGroup or the layout 174 // animation is over 175 // Set by default 176 private static final int FLAG_ANIMATION_DONE = 0x10; 177 178 // If set, this ViewGroup has padding; if unset there is no padding and we don't need 179 // to clip it, even if FLAG_CLIP_TO_PADDING is set 180 private static final int FLAG_PADDING_NOT_NULL = 0x20; 181 182 // When set, this ViewGroup caches its children in a Bitmap before starting a layout animation 183 // Set by default 184 private static final int FLAG_ANIMATION_CACHE = 0x40; 185 186 // When set, this ViewGroup converts calls to invalidate(Rect) to invalidate() during a 187 // layout animation; this avoid clobbering the hierarchy 188 // Automatically set when the layout animation starts, depending on the animation's 189 // characteristics 190 private static final int FLAG_OPTIMIZE_INVALIDATE = 0x80; 191 192 // When set, the next call to drawChild() will clear mChildTransformation's matrix 193 private static final int FLAG_CLEAR_TRANSFORMATION = 0x100; 194 195 // When set, this ViewGroup invokes mAnimationListener.onAnimationEnd() and removes 196 // the children's Bitmap caches if necessary 197 // This flag is set when the layout animation is over (after FLAG_ANIMATION_DONE is set) 198 private static final int FLAG_NOTIFY_ANIMATION_LISTENER = 0x200; 199 200 /** 201 * When set, the drawing method will call {@link #getChildDrawingOrder(int, int)} 202 * to get the index of the child to draw for that iteration. 203 * 204 * @hide 205 */ 206 protected static final int FLAG_USE_CHILD_DRAWING_ORDER = 0x400; 207 208 /** 209 * When set, this ViewGroup supports static transformations on children; this causes 210 * {@link #getChildStaticTransformation(View, android.view.animation.Transformation)} to be 211 * invoked when a child is drawn. 212 * 213 * Any subclass overriding 214 * {@link #getChildStaticTransformation(View, android.view.animation.Transformation)} should 215 * set this flags in {@link #mGroupFlags}. 216 * 217 * {@hide} 218 */ 219 protected static final int FLAG_SUPPORT_STATIC_TRANSFORMATIONS = 0x800; 220 221 // When the previous drawChild() invocation used an alpha value that was lower than 222 // 1.0 and set it in mCachePaint 223 private static final int FLAG_ALPHA_LOWER_THAN_ONE = 0x1000; 224 225 /** 226 * When set, this ViewGroup's drawable states also include those 227 * of its children. 228 */ 229 private static final int FLAG_ADD_STATES_FROM_CHILDREN = 0x2000; 230 231 /** 232 * When set, this ViewGroup tries to always draw its children using their drawing cache. 233 */ 234 private static final int FLAG_ALWAYS_DRAWN_WITH_CACHE = 0x4000; 235 236 /** 237 * When set, and if FLAG_ALWAYS_DRAWN_WITH_CACHE is not set, this ViewGroup will try to 238 * draw its children with their drawing cache. 239 */ 240 private static final int FLAG_CHILDREN_DRAWN_WITH_CACHE = 0x8000; 241 242 /** 243 * When set, this group will go through its list of children to notify them of 244 * any drawable state change. 245 */ 246 private static final int FLAG_NOTIFY_CHILDREN_ON_DRAWABLE_STATE_CHANGE = 0x10000; 247 248 private static final int FLAG_MASK_FOCUSABILITY = 0x60000; 249 250 /** 251 * This view will get focus before any of its descendants. 252 */ 253 public static final int FOCUS_BEFORE_DESCENDANTS = 0x20000; 254 255 /** 256 * This view will get focus only if none of its descendants want it. 257 */ 258 public static final int FOCUS_AFTER_DESCENDANTS = 0x40000; 259 260 /** 261 * This view will block any of its descendants from getting focus, even 262 * if they are focusable. 263 */ 264 public static final int FOCUS_BLOCK_DESCENDANTS = 0x60000; 265 266 /** 267 * Used to map between enum in attrubutes and flag values. 268 */ 269 private static final int[] DESCENDANT_FOCUSABILITY_FLAGS = 270 {FOCUS_BEFORE_DESCENDANTS, FOCUS_AFTER_DESCENDANTS, 271 FOCUS_BLOCK_DESCENDANTS}; 272 273 /** 274 * When set, this ViewGroup should not intercept touch events. 275 * {@hide} 276 */ 277 protected static final int FLAG_DISALLOW_INTERCEPT = 0x80000; 278 279 /** 280 * When set, this ViewGroup will split MotionEvents to multiple child Views when appropriate. 281 */ 282 private static final int FLAG_SPLIT_MOTION_EVENTS = 0x200000; 283 284 /** 285 * Indicates which types of drawing caches are to be kept in memory. 286 * This field should be made private, so it is hidden from the SDK. 287 * {@hide} 288 */ 289 protected int mPersistentDrawingCache; 290 291 /** 292 * Used to indicate that no drawing cache should be kept in memory. 293 */ 294 public static final int PERSISTENT_NO_CACHE = 0x0; 295 296 /** 297 * Used to indicate that the animation drawing cache should be kept in memory. 298 */ 299 public static final int PERSISTENT_ANIMATION_CACHE = 0x1; 300 301 /** 302 * Used to indicate that the scrolling drawing cache should be kept in memory. 303 */ 304 public static final int PERSISTENT_SCROLLING_CACHE = 0x2; 305 306 /** 307 * Used to indicate that all drawing caches should be kept in memory. 308 */ 309 public static final int PERSISTENT_ALL_CACHES = 0x3; 310 311 /** 312 * We clip to padding when FLAG_CLIP_TO_PADDING and FLAG_PADDING_NOT_NULL 313 * are set at the same time. 314 */ 315 protected static final int CLIP_TO_PADDING_MASK = FLAG_CLIP_TO_PADDING | FLAG_PADDING_NOT_NULL; 316 317 // Index of the child's left position in the mLocation array 318 private static final int CHILD_LEFT_INDEX = 0; 319 // Index of the child's top position in the mLocation array 320 private static final int CHILD_TOP_INDEX = 1; 321 322 // Child views of this ViewGroup 323 private View[] mChildren; 324 // Number of valid children in the mChildren array, the rest should be null or not 325 // considered as children 326 327 private boolean mLayoutSuppressed = false; 328 329 private int mChildrenCount; 330 331 private static final int ARRAY_INITIAL_CAPACITY = 12; 332 private static final int ARRAY_CAPACITY_INCREMENT = 12; 333 334 // Used to draw cached views 335 private final Paint mCachePaint = new Paint(); 336 337 // Used to animate add/remove changes in layout 338 private LayoutTransition mTransition; 339 340 // The set of views that are currently being transitioned. This list is used to track views 341 // being removed that should not actually be removed from the parent yet because they are 342 // being animated. 343 private ArrayList<View> mTransitioningViews; 344 345 // List of children changing visibility. This is used to potentially keep rendering 346 // views during a transition when they otherwise would have become gone/invisible 347 private ArrayList<View> mVisibilityChangingChildren; 348 349 public ViewGroup(Context context) { 350 super(context); 351 initViewGroup(); 352 } 353 354 public ViewGroup(Context context, AttributeSet attrs) { 355 super(context, attrs); 356 initViewGroup(); 357 initFromAttributes(context, attrs); 358 } 359 360 public ViewGroup(Context context, AttributeSet attrs, int defStyle) { 361 super(context, attrs, defStyle); 362 initViewGroup(); 363 initFromAttributes(context, attrs); 364 } 365 366 private void initViewGroup() { 367 // ViewGroup doesn't draw by default 368 setFlags(WILL_NOT_DRAW, DRAW_MASK); 369 mGroupFlags |= FLAG_CLIP_CHILDREN; 370 mGroupFlags |= FLAG_CLIP_TO_PADDING; 371 mGroupFlags |= FLAG_ANIMATION_DONE; 372 mGroupFlags |= FLAG_ANIMATION_CACHE; 373 mGroupFlags |= FLAG_ALWAYS_DRAWN_WITH_CACHE; 374 375 if (mContext.getApplicationInfo().targetSdkVersion >= Build.VERSION_CODES.HONEYCOMB) { 376 mGroupFlags |= FLAG_SPLIT_MOTION_EVENTS; 377 } 378 379 setDescendantFocusability(FOCUS_BEFORE_DESCENDANTS); 380 381 mChildren = new View[ARRAY_INITIAL_CAPACITY]; 382 mChildrenCount = 0; 383 384 mCachePaint.setDither(false); 385 386 mPersistentDrawingCache = PERSISTENT_SCROLLING_CACHE; 387 } 388 389 private void initFromAttributes(Context context, AttributeSet attrs) { 390 TypedArray a = context.obtainStyledAttributes(attrs, 391 R.styleable.ViewGroup); 392 393 final int N = a.getIndexCount(); 394 for (int i = 0; i < N; i++) { 395 int attr = a.getIndex(i); 396 switch (attr) { 397 case R.styleable.ViewGroup_clipChildren: 398 setClipChildren(a.getBoolean(attr, true)); 399 break; 400 case R.styleable.ViewGroup_clipToPadding: 401 setClipToPadding(a.getBoolean(attr, true)); 402 break; 403 case R.styleable.ViewGroup_animationCache: 404 setAnimationCacheEnabled(a.getBoolean(attr, true)); 405 break; 406 case R.styleable.ViewGroup_persistentDrawingCache: 407 setPersistentDrawingCache(a.getInt(attr, PERSISTENT_SCROLLING_CACHE)); 408 break; 409 case R.styleable.ViewGroup_addStatesFromChildren: 410 setAddStatesFromChildren(a.getBoolean(attr, false)); 411 break; 412 case R.styleable.ViewGroup_alwaysDrawnWithCache: 413 setAlwaysDrawnWithCacheEnabled(a.getBoolean(attr, true)); 414 break; 415 case R.styleable.ViewGroup_layoutAnimation: 416 int id = a.getResourceId(attr, -1); 417 if (id > 0) { 418 setLayoutAnimation(AnimationUtils.loadLayoutAnimation(mContext, id)); 419 } 420 break; 421 case R.styleable.ViewGroup_descendantFocusability: 422 setDescendantFocusability(DESCENDANT_FOCUSABILITY_FLAGS[a.getInt(attr, 0)]); 423 break; 424 case R.styleable.ViewGroup_splitMotionEvents: 425 setMotionEventSplittingEnabled(a.getBoolean(attr, false)); 426 break; 427 case R.styleable.ViewGroup_animateLayoutChanges: 428 boolean animateLayoutChanges = a.getBoolean(attr, false); 429 if (animateLayoutChanges) { 430 setLayoutTransition(new LayoutTransition()); 431 } 432 break; 433 } 434 } 435 436 a.recycle(); 437 } 438 439 /** 440 * Gets the descendant focusability of this view group. The descendant 441 * focusability defines the relationship between this view group and its 442 * descendants when looking for a view to take focus in 443 * {@link #requestFocus(int, android.graphics.Rect)}. 444 * 445 * @return one of {@link #FOCUS_BEFORE_DESCENDANTS}, {@link #FOCUS_AFTER_DESCENDANTS}, 446 * {@link #FOCUS_BLOCK_DESCENDANTS}. 447 */ 448 @ViewDebug.ExportedProperty(category = "focus", mapping = { 449 @ViewDebug.IntToString(from = FOCUS_BEFORE_DESCENDANTS, to = "FOCUS_BEFORE_DESCENDANTS"), 450 @ViewDebug.IntToString(from = FOCUS_AFTER_DESCENDANTS, to = "FOCUS_AFTER_DESCENDANTS"), 451 @ViewDebug.IntToString(from = FOCUS_BLOCK_DESCENDANTS, to = "FOCUS_BLOCK_DESCENDANTS") 452 }) 453 public int getDescendantFocusability() { 454 return mGroupFlags & FLAG_MASK_FOCUSABILITY; 455 } 456 457 /** 458 * Set the descendant focusability of this view group. This defines the relationship 459 * between this view group and its descendants when looking for a view to 460 * take focus in {@link #requestFocus(int, android.graphics.Rect)}. 461 * 462 * @param focusability one of {@link #FOCUS_BEFORE_DESCENDANTS}, {@link #FOCUS_AFTER_DESCENDANTS}, 463 * {@link #FOCUS_BLOCK_DESCENDANTS}. 464 */ 465 public void setDescendantFocusability(int focusability) { 466 switch (focusability) { 467 case FOCUS_BEFORE_DESCENDANTS: 468 case FOCUS_AFTER_DESCENDANTS: 469 case FOCUS_BLOCK_DESCENDANTS: 470 break; 471 default: 472 throw new IllegalArgumentException("must be one of FOCUS_BEFORE_DESCENDANTS, " 473 + "FOCUS_AFTER_DESCENDANTS, FOCUS_BLOCK_DESCENDANTS"); 474 } 475 mGroupFlags &= ~FLAG_MASK_FOCUSABILITY; 476 mGroupFlags |= (focusability & FLAG_MASK_FOCUSABILITY); 477 } 478 479 /** 480 * {@inheritDoc} 481 */ 482 @Override 483 void handleFocusGainInternal(int direction, Rect previouslyFocusedRect) { 484 if (mFocused != null) { 485 mFocused.unFocus(); 486 mFocused = null; 487 } 488 super.handleFocusGainInternal(direction, previouslyFocusedRect); 489 } 490 491 /** 492 * {@inheritDoc} 493 */ 494 public void requestChildFocus(View child, View focused) { 495 if (DBG) { 496 System.out.println(this + " requestChildFocus()"); 497 } 498 if (getDescendantFocusability() == FOCUS_BLOCK_DESCENDANTS) { 499 return; 500 } 501 502 // Unfocus us, if necessary 503 super.unFocus(); 504 505 // We had a previous notion of who had focus. Clear it. 506 if (mFocused != child) { 507 if (mFocused != null) { 508 mFocused.unFocus(); 509 } 510 511 mFocused = child; 512 } 513 if (mParent != null) { 514 mParent.requestChildFocus(this, focused); 515 } 516 } 517 518 /** 519 * {@inheritDoc} 520 */ 521 public void focusableViewAvailable(View v) { 522 if (mParent != null 523 // shortcut: don't report a new focusable view if we block our descendants from 524 // getting focus 525 && (getDescendantFocusability() != FOCUS_BLOCK_DESCENDANTS) 526 // shortcut: don't report a new focusable view if we already are focused 527 // (and we don't prefer our descendants) 528 // 529 // note: knowing that mFocused is non-null is not a good enough reason 530 // to break the traversal since in that case we'd actually have to find 531 // the focused view and make sure it wasn't FOCUS_AFTER_DESCENDANTS and 532 // an ancestor of v; this will get checked for at ViewRoot 533 && !(isFocused() && getDescendantFocusability() != FOCUS_AFTER_DESCENDANTS)) { 534 mParent.focusableViewAvailable(v); 535 } 536 } 537 538 /** 539 * {@inheritDoc} 540 */ 541 public boolean showContextMenuForChild(View originalView) { 542 return mParent != null && mParent.showContextMenuForChild(originalView); 543 } 544 545 /** 546 * {@inheritDoc} 547 */ 548 public ActionMode startActionModeForChild(View originalView, ActionMode.Callback callback) { 549 return mParent != null ? mParent.startActionModeForChild(originalView, callback) : null; 550 } 551 552 /** 553 * Find the nearest view in the specified direction that wants to take 554 * focus. 555 * 556 * @param focused The view that currently has focus 557 * @param direction One of FOCUS_UP, FOCUS_DOWN, FOCUS_LEFT, and 558 * FOCUS_RIGHT, or 0 for not applicable. 559 */ 560 public View focusSearch(View focused, int direction) { 561 if (isRootNamespace()) { 562 // root namespace means we should consider ourselves the top of the 563 // tree for focus searching; otherwise we could be focus searching 564 // into other tabs. see LocalActivityManager and TabHost for more info 565 return FocusFinder.getInstance().findNextFocus(this, focused, direction); 566 } else if (mParent != null) { 567 return mParent.focusSearch(focused, direction); 568 } 569 return null; 570 } 571 572 /** 573 * {@inheritDoc} 574 */ 575 public boolean requestChildRectangleOnScreen(View child, Rect rectangle, boolean immediate) { 576 return false; 577 } 578 579 /** 580 * {@inheritDoc} 581 */ 582 @Override 583 public boolean dispatchUnhandledMove(View focused, int direction) { 584 return mFocused != null && 585 mFocused.dispatchUnhandledMove(focused, direction); 586 } 587 588 /** 589 * {@inheritDoc} 590 */ 591 public void clearChildFocus(View child) { 592 if (DBG) { 593 System.out.println(this + " clearChildFocus()"); 594 } 595 596 mFocused = null; 597 if (mParent != null) { 598 mParent.clearChildFocus(this); 599 } 600 } 601 602 /** 603 * {@inheritDoc} 604 */ 605 @Override 606 public void clearFocus() { 607 super.clearFocus(); 608 609 // clear any child focus if it exists 610 if (mFocused != null) { 611 mFocused.clearFocus(); 612 } 613 } 614 615 /** 616 * {@inheritDoc} 617 */ 618 @Override 619 void unFocus() { 620 if (DBG) { 621 System.out.println(this + " unFocus()"); 622 } 623 624 super.unFocus(); 625 if (mFocused != null) { 626 mFocused.unFocus(); 627 } 628 mFocused = null; 629 } 630 631 /** 632 * Returns the focused child of this view, if any. The child may have focus 633 * or contain focus. 634 * 635 * @return the focused child or null. 636 */ 637 public View getFocusedChild() { 638 return mFocused; 639 } 640 641 /** 642 * Returns true if this view has or contains focus 643 * 644 * @return true if this view has or contains focus 645 */ 646 @Override 647 public boolean hasFocus() { 648 return (mPrivateFlags & FOCUSED) != 0 || mFocused != null; 649 } 650 651 /* 652 * (non-Javadoc) 653 * 654 * @see android.view.View#findFocus() 655 */ 656 @Override 657 public View findFocus() { 658 if (DBG) { 659 System.out.println("Find focus in " + this + ": flags=" 660 + isFocused() + ", child=" + mFocused); 661 } 662 663 if (isFocused()) { 664 return this; 665 } 666 667 if (mFocused != null) { 668 return mFocused.findFocus(); 669 } 670 return null; 671 } 672 673 /** 674 * {@inheritDoc} 675 */ 676 @Override 677 public boolean hasFocusable() { 678 if ((mViewFlags & VISIBILITY_MASK) != VISIBLE) { 679 return false; 680 } 681 682 if (isFocusable()) { 683 return true; 684 } 685 686 final int descendantFocusability = getDescendantFocusability(); 687 if (descendantFocusability != FOCUS_BLOCK_DESCENDANTS) { 688 final int count = mChildrenCount; 689 final View[] children = mChildren; 690 691 for (int i = 0; i < count; i++) { 692 final View child = children[i]; 693 if (child.hasFocusable()) { 694 return true; 695 } 696 } 697 } 698 699 return false; 700 } 701 702 /** 703 * {@inheritDoc} 704 */ 705 @Override 706 public void addFocusables(ArrayList<View> views, int direction) { 707 addFocusables(views, direction, FOCUSABLES_TOUCH_MODE); 708 } 709 710 /** 711 * {@inheritDoc} 712 */ 713 @Override 714 public void addFocusables(ArrayList<View> views, int direction, int focusableMode) { 715 final int focusableCount = views.size(); 716 717 final int descendantFocusability = getDescendantFocusability(); 718 719 if (descendantFocusability != FOCUS_BLOCK_DESCENDANTS) { 720 final int count = mChildrenCount; 721 final View[] children = mChildren; 722 723 for (int i = 0; i < count; i++) { 724 final View child = children[i]; 725 if ((child.mViewFlags & VISIBILITY_MASK) == VISIBLE) { 726 child.addFocusables(views, direction, focusableMode); 727 } 728 } 729 } 730 731 // we add ourselves (if focusable) in all cases except for when we are 732 // FOCUS_AFTER_DESCENDANTS and there are some descendants focusable. this is 733 // to avoid the focus search finding layouts when a more precise search 734 // among the focusable children would be more interesting. 735 if ( 736 descendantFocusability != FOCUS_AFTER_DESCENDANTS || 737 // No focusable descendants 738 (focusableCount == views.size())) { 739 super.addFocusables(views, direction, focusableMode); 740 } 741 } 742 743 /** 744 * {@inheritDoc} 745 */ 746 @Override 747 public void dispatchWindowFocusChanged(boolean hasFocus) { 748 super.dispatchWindowFocusChanged(hasFocus); 749 final int count = mChildrenCount; 750 final View[] children = mChildren; 751 for (int i = 0; i < count; i++) { 752 children[i].dispatchWindowFocusChanged(hasFocus); 753 } 754 } 755 756 /** 757 * {@inheritDoc} 758 */ 759 @Override 760 public void addTouchables(ArrayList<View> views) { 761 super.addTouchables(views); 762 763 final int count = mChildrenCount; 764 final View[] children = mChildren; 765 766 for (int i = 0; i < count; i++) { 767 final View child = children[i]; 768 if ((child.mViewFlags & VISIBILITY_MASK) == VISIBLE) { 769 child.addTouchables(views); 770 } 771 } 772 } 773 774 /** 775 * {@inheritDoc} 776 */ 777 @Override 778 public void dispatchDisplayHint(int hint) { 779 super.dispatchDisplayHint(hint); 780 final int count = mChildrenCount; 781 final View[] children = mChildren; 782 for (int i = 0; i < count; i++) { 783 children[i].dispatchDisplayHint(hint); 784 } 785 } 786 787 /** 788 * @hide 789 * @param child 790 * @param visibility 791 */ 792 void onChildVisibilityChanged(View child, int visibility) { 793 if (mTransition != null) { 794 if (visibility == VISIBLE) { 795 mTransition.showChild(this, child); 796 } else { 797 mTransition.hideChild(this, child); 798 } 799 if (visibility != VISIBLE) { 800 // Only track this on disappearing views - appearing views are already visible 801 // and don't need special handling during drawChild() 802 if (mVisibilityChangingChildren == null) { 803 mVisibilityChangingChildren = new ArrayList<View>(); 804 } 805 mVisibilityChangingChildren.add(child); 806 if (mTransitioningViews != null && mTransitioningViews.contains(child)) { 807 addDisappearingView(child); 808 } 809 } 810 } 811 812 // in all cases, for drags 813 if (mCurrentDrag != null) { 814 if (visibility == VISIBLE) { 815 notifyChildOfDrag(child); 816 } 817 } 818 } 819 820 /** 821 * {@inheritDoc} 822 */ 823 @Override 824 protected void dispatchVisibilityChanged(View changedView, int visibility) { 825 super.dispatchVisibilityChanged(changedView, visibility); 826 final int count = mChildrenCount; 827 final View[] children = mChildren; 828 for (int i = 0; i < count; i++) { 829 children[i].dispatchVisibilityChanged(changedView, visibility); 830 } 831 } 832 833 /** 834 * {@inheritDoc} 835 */ 836 @Override 837 public void dispatchWindowVisibilityChanged(int visibility) { 838 super.dispatchWindowVisibilityChanged(visibility); 839 final int count = mChildrenCount; 840 final View[] children = mChildren; 841 for (int i = 0; i < count; i++) { 842 children[i].dispatchWindowVisibilityChanged(visibility); 843 } 844 } 845 846 /** 847 * {@inheritDoc} 848 */ 849 @Override 850 public void dispatchConfigurationChanged(Configuration newConfig) { 851 super.dispatchConfigurationChanged(newConfig); 852 final int count = mChildrenCount; 853 final View[] children = mChildren; 854 for (int i = 0; i < count; i++) { 855 children[i].dispatchConfigurationChanged(newConfig); 856 } 857 } 858 859 /** 860 * {@inheritDoc} 861 */ 862 public void recomputeViewAttributes(View child) { 863 if (mAttachInfo != null && !mAttachInfo.mRecomputeGlobalAttributes) { 864 ViewParent parent = mParent; 865 if (parent != null) parent.recomputeViewAttributes(this); 866 } 867 } 868 869 @Override 870 void dispatchCollectViewAttributes(int visibility) { 871 visibility |= mViewFlags&VISIBILITY_MASK; 872 super.dispatchCollectViewAttributes(visibility); 873 final int count = mChildrenCount; 874 final View[] children = mChildren; 875 for (int i = 0; i < count; i++) { 876 children[i].dispatchCollectViewAttributes(visibility); 877 } 878 } 879 880 /** 881 * {@inheritDoc} 882 */ 883 public void bringChildToFront(View child) { 884 int index = indexOfChild(child); 885 if (index >= 0) { 886 removeFromArray(index); 887 addInArray(child, mChildrenCount); 888 child.mParent = this; 889 } 890 } 891 892 /** 893 * {@inheritDoc} 894 * 895 * !!! TODO: write real docs 896 */ 897 @Override 898 public boolean dispatchDragEvent(DragEvent event) { 899 boolean retval = false; 900 final float tx = event.mX; 901 final float ty = event.mY; 902 903 ViewRoot root = getViewRoot(); 904 905 // Dispatch down the view hierarchy 906 switch (event.mAction) { 907 case DragEvent.ACTION_DRAG_STARTED: { 908 // clear state to recalculate which views we drag over 909 mCurrentDragView = null; 910 911 // Set up our tracking of drag-started notifications 912 mCurrentDrag = DragEvent.obtain(event); 913 if (mDragNotifiedChildren == null) { 914 mDragNotifiedChildren = new HashSet<View>(); 915 } else { 916 mDragNotifiedChildren.clear(); 917 } 918 919 // Now dispatch down to our children, caching the responses 920 mChildAcceptsDrag = false; 921 final int count = mChildrenCount; 922 final View[] children = mChildren; 923 for (int i = 0; i < count; i++) { 924 final View child = children[i]; 925 if (child.getVisibility() == VISIBLE) { 926 final boolean handled = notifyChildOfDrag(children[i]); 927 if (handled) { 928 mChildAcceptsDrag = true; 929 } 930 } 931 } 932 933 // Return HANDLED if one of our children can accept the drag 934 if (mChildAcceptsDrag) { 935 retval = true; 936 } 937 } break; 938 939 case DragEvent.ACTION_DRAG_ENDED: { 940 // Release the bookkeeping now that the drag lifecycle has ended 941 if (mDragNotifiedChildren != null) { 942 for (View child : mDragNotifiedChildren) { 943 // If a child was notified about an ongoing drag, it's told that it's over 944 child.dispatchDragEvent(event); 945 } 946 947 mDragNotifiedChildren.clear(); 948 mCurrentDrag.recycle(); 949 mCurrentDrag = null; 950 } 951 952 // We consider drag-ended to have been handled if one of our children 953 // had offered to handle the drag. 954 if (mChildAcceptsDrag) { 955 retval = true; 956 } 957 } break; 958 959 case DragEvent.ACTION_DRAG_LOCATION: { 960 // Find the [possibly new] drag target 961 final View target = findFrontmostDroppableChildAt(event.mX, event.mY, mLocalPoint); 962 963 // If we've changed apparent drag target, tell the view root which view 964 // we're over now [for purposes of the eventual drag-recipient-changed 965 // notifications to the framework] and tell the new target that the drag 966 // has entered its bounds. The root will see setDragFocus() calls all 967 // the way down to the final leaf view that is handling the LOCATION event 968 // before reporting the new potential recipient to the framework. 969 if (mCurrentDragView != target) { 970 root.setDragFocus(target); 971 972 final int action = event.mAction; 973 // If we've dragged off of a child view, send it the EXITED message 974 if (mCurrentDragView != null) { 975 event.mAction = DragEvent.ACTION_DRAG_EXITED; 976 mCurrentDragView.dispatchDragEvent(event); 977 } 978 mCurrentDragView = target; 979 980 // If we've dragged over a new child view, send it the ENTERED message 981 if (target != null) { 982 event.mAction = DragEvent.ACTION_DRAG_ENTERED; 983 target.dispatchDragEvent(event); 984 } 985 event.mAction = action; // restore the event's original state 986 } 987 988 // Dispatch the actual drag location notice, localized into its coordinates 989 if (target != null) { 990 event.mX = mLocalPoint.x; 991 event.mY = mLocalPoint.y; 992 993 retval = target.dispatchDragEvent(event); 994 995 event.mX = tx; 996 event.mY = ty; 997 } 998 } break; 999 1000 /* Entered / exited dispatch 1001 * 1002 * DRAG_ENTERED is not dispatched downwards from ViewGroup. The reason for this is 1003 * that we're about to get the corresponding LOCATION event, which we will use to 1004 * determine which of our children is the new target; at that point we will 1005 * push a DRAG_ENTERED down to the new target child [which may itself be a ViewGroup]. 1006 * 1007 * DRAG_EXITED *is* dispatched all the way down immediately: once we know the 1008 * drag has left this ViewGroup, we know by definition that every contained subview 1009 * is also no longer under the drag point. 1010 */ 1011 1012 case DragEvent.ACTION_DRAG_EXITED: { 1013 if (mCurrentDragView != null) { 1014 mCurrentDragView.dispatchDragEvent(event); 1015 mCurrentDragView = null; 1016 } 1017 } break; 1018 1019 case DragEvent.ACTION_DROP: { 1020 if (ViewDebug.DEBUG_DRAG) Log.d(View.VIEW_LOG_TAG, "Drop event: " + event); 1021 View target = findFrontmostDroppableChildAt(event.mX, event.mY, mLocalPoint); 1022 if (target != null) { 1023 if (ViewDebug.DEBUG_DRAG) Log.d(View.VIEW_LOG_TAG, " dispatch drop to " + target); 1024 event.mX = mLocalPoint.x; 1025 event.mY = mLocalPoint.y; 1026 retval = target.dispatchDragEvent(event); 1027 event.mX = tx; 1028 event.mY = ty; 1029 } else { 1030 if (ViewDebug.DEBUG_DRAG) { 1031 Log.d(View.VIEW_LOG_TAG, " not dropped on an accepting view"); 1032 } 1033 } 1034 } break; 1035 } 1036 1037 // If none of our children could handle the event, try here 1038 if (!retval) { 1039 // Call up to the View implementation that dispatches to installed listeners 1040 retval = super.dispatchDragEvent(event); 1041 } 1042 return retval; 1043 } 1044 1045 // Find the frontmost child view that lies under the given point, and calculate 1046 // the position within its own local coordinate system. 1047 View findFrontmostDroppableChildAt(float x, float y, PointF outLocalPoint) { 1048 final int count = mChildrenCount; 1049 final View[] children = mChildren; 1050 for (int i = count - 1; i >= 0; i--) { 1051 final View child = children[i]; 1052 if (!child.mCanAcceptDrop) { 1053 continue; 1054 } 1055 1056 if (isTransformedTouchPointInView(x, y, child, outLocalPoint)) { 1057 return child; 1058 } 1059 } 1060 return null; 1061 } 1062 1063 boolean notifyChildOfDrag(View child) { 1064 if (ViewDebug.DEBUG_DRAG) { 1065 Log.d(View.VIEW_LOG_TAG, "Sending drag-started to view: " + child); 1066 } 1067 1068 if (! mDragNotifiedChildren.contains(child)) { 1069 mDragNotifiedChildren.add(child); 1070 child.mCanAcceptDrop = child.dispatchDragEvent(mCurrentDrag); 1071 } 1072 return child.mCanAcceptDrop; 1073 } 1074 1075 @Override 1076 public void dispatchSystemUiVisibilityChanged(int visible) { 1077 super.dispatchSystemUiVisibilityChanged(visible); 1078 1079 final int count = mChildrenCount; 1080 final View[] children = mChildren; 1081 for (int i=0; i <count; i++) { 1082 final View child = children[i]; 1083 child.dispatchSystemUiVisibilityChanged(visible); 1084 } 1085 } 1086 1087 /** 1088 * {@inheritDoc} 1089 */ 1090 @Override 1091 public boolean dispatchKeyEventPreIme(KeyEvent event) { 1092 if ((mPrivateFlags & (FOCUSED | HAS_BOUNDS)) == (FOCUSED | HAS_BOUNDS)) { 1093 return super.dispatchKeyEventPreIme(event); 1094 } else if (mFocused != null && (mFocused.mPrivateFlags & HAS_BOUNDS) == HAS_BOUNDS) { 1095 return mFocused.dispatchKeyEventPreIme(event); 1096 } 1097 return false; 1098 } 1099 1100 /** 1101 * {@inheritDoc} 1102 */ 1103 @Override 1104 public boolean dispatchKeyEvent(KeyEvent event) { 1105 if ((mPrivateFlags & (FOCUSED | HAS_BOUNDS)) == (FOCUSED | HAS_BOUNDS)) { 1106 return super.dispatchKeyEvent(event); 1107 } else if (mFocused != null && (mFocused.mPrivateFlags & HAS_BOUNDS) == HAS_BOUNDS) { 1108 return mFocused.dispatchKeyEvent(event); 1109 } 1110 return false; 1111 } 1112 1113 /** 1114 * {@inheritDoc} 1115 */ 1116 @Override 1117 public boolean dispatchKeyShortcutEvent(KeyEvent event) { 1118 if ((mPrivateFlags & (FOCUSED | HAS_BOUNDS)) == (FOCUSED | HAS_BOUNDS)) { 1119 return super.dispatchKeyShortcutEvent(event); 1120 } else if (mFocused != null && (mFocused.mPrivateFlags & HAS_BOUNDS) == HAS_BOUNDS) { 1121 return mFocused.dispatchKeyShortcutEvent(event); 1122 } 1123 return false; 1124 } 1125 1126 /** 1127 * {@inheritDoc} 1128 */ 1129 @Override 1130 public boolean dispatchTrackballEvent(MotionEvent event) { 1131 if ((mPrivateFlags & (FOCUSED | HAS_BOUNDS)) == (FOCUSED | HAS_BOUNDS)) { 1132 return super.dispatchTrackballEvent(event); 1133 } else if (mFocused != null && (mFocused.mPrivateFlags & HAS_BOUNDS) == HAS_BOUNDS) { 1134 return mFocused.dispatchTrackballEvent(event); 1135 } 1136 return false; 1137 } 1138 1139 /** 1140 * {@inheritDoc} 1141 */ 1142 @Override 1143 public boolean dispatchTouchEvent(MotionEvent ev) { 1144 if (!onFilterTouchEventForSecurity(ev)) { 1145 return false; 1146 } 1147 1148 final int action = ev.getAction(); 1149 final int actionMasked = action & MotionEvent.ACTION_MASK; 1150 1151 // Handle an initial down. 1152 if (actionMasked == MotionEvent.ACTION_DOWN) { 1153 // Throw away all previous state when starting a new touch gesture. 1154 // The framework may have dropped the up or cancel event for the previous gesture 1155 // due to an app switch, ANR, or some other state change. 1156 cancelAndClearTouchTargets(ev); 1157 resetTouchState(); 1158 } 1159 1160 // Check for interception. 1161 final boolean intercepted; 1162 if (actionMasked == MotionEvent.ACTION_DOWN || mFirstTouchTarget != null) { 1163 final boolean disallowIntercept = (mGroupFlags & FLAG_DISALLOW_INTERCEPT) != 0; 1164 if (!disallowIntercept) { 1165 intercepted = onInterceptTouchEvent(ev); 1166 ev.setAction(action); // restore action in case onInterceptTouchEvent() changed it 1167 } else { 1168 intercepted = false; 1169 } 1170 } else { 1171 intercepted = true; 1172 } 1173 1174 // Check for cancelation. 1175 final boolean canceled = resetCancelNextUpFlag(this) 1176 || actionMasked == MotionEvent.ACTION_CANCEL; 1177 1178 // Update list of touch targets for pointer down, if needed. 1179 final boolean split = (mGroupFlags & FLAG_SPLIT_MOTION_EVENTS) != 0; 1180 TouchTarget newTouchTarget = null; 1181 boolean alreadyDispatchedToNewTouchTarget = false; 1182 if (!canceled && !intercepted) { 1183 if (actionMasked == MotionEvent.ACTION_DOWN 1184 || (split && actionMasked == MotionEvent.ACTION_POINTER_DOWN)) { 1185 final int actionIndex = ev.getActionIndex(); // always 0 for down 1186 final int idBitsToAssign = split ? 1 << ev.getPointerId(actionIndex) 1187 : TouchTarget.ALL_POINTER_IDS; 1188 1189 // Clean up earlier touch targets for this pointer id in case they 1190 // have become out of sync. 1191 removePointersFromTouchTargets(idBitsToAssign); 1192 1193 final int childrenCount = mChildrenCount; 1194 if (childrenCount != 0) { 1195 // Find a child that can receive the event. Scan children from front to back. 1196 final View[] children = mChildren; 1197 final float x = ev.getX(actionIndex); 1198 final float y = ev.getY(actionIndex); 1199 1200 for (int i = childrenCount - 1; i >= 0; i--) { 1201 final View child = children[i]; 1202 if ((child.mViewFlags & VISIBILITY_MASK) != VISIBLE 1203 && child.getAnimation() == null) { 1204 // Skip invisible child unless it is animating. 1205 continue; 1206 } 1207 1208 if (!isTransformedTouchPointInView(x, y, child, null)) { 1209 // New pointer is out of child's bounds. 1210 continue; 1211 } 1212 1213 newTouchTarget = getTouchTarget(child); 1214 if (newTouchTarget != null) { 1215 // Child is already receiving touch within its bounds. 1216 // Give it the new pointer in addition to the ones it is handling. 1217 newTouchTarget.pointerIdBits |= idBitsToAssign; 1218 break; 1219 } 1220 1221 resetCancelNextUpFlag(child); 1222 if (dispatchTransformedTouchEvent(ev, false, child, idBitsToAssign)) { 1223 // Child wants to receive touch within its bounds. 1224 mLastTouchDownTime = ev.getDownTime(); 1225 mLastTouchDownIndex = i; 1226 mLastTouchDownX = ev.getX(); 1227 mLastTouchDownY = ev.getY(); 1228 newTouchTarget = addTouchTarget(child, idBitsToAssign); 1229 alreadyDispatchedToNewTouchTarget = true; 1230 break; 1231 } 1232 } 1233 } 1234 1235 if (newTouchTarget == null && mFirstTouchTarget != null) { 1236 // Did not find a child to receive the event. 1237 // Assign the pointer to the least recently added target. 1238 newTouchTarget = mFirstTouchTarget; 1239 while (newTouchTarget.next != null) { 1240 newTouchTarget = newTouchTarget.next; 1241 } 1242 newTouchTarget.pointerIdBits |= idBitsToAssign; 1243 } 1244 } 1245 } 1246 1247 // Dispatch to touch targets. 1248 boolean handled = false; 1249 if (mFirstTouchTarget == null) { 1250 // No touch targets so treat this as an ordinary view. 1251 handled = dispatchTransformedTouchEvent(ev, canceled, null, 1252 TouchTarget.ALL_POINTER_IDS); 1253 } else { 1254 // Dispatch to touch targets, excluding the new touch target if we already 1255 // dispatched to it. Cancel touch targets if necessary. 1256 TouchTarget predecessor = null; 1257 TouchTarget target = mFirstTouchTarget; 1258 while (target != null) { 1259 final TouchTarget next = target.next; 1260 if (alreadyDispatchedToNewTouchTarget && target == newTouchTarget) { 1261 handled = true; 1262 } else { 1263 final boolean cancelChild = resetCancelNextUpFlag(target.child) || intercepted; 1264 if (dispatchTransformedTouchEvent(ev, cancelChild, 1265 target.child, target.pointerIdBits)) { 1266 handled = true; 1267 } 1268 if (cancelChild) { 1269 if (predecessor == null) { 1270 mFirstTouchTarget = next; 1271 } else { 1272 predecessor.next = next; 1273 } 1274 target.recycle(); 1275 target = next; 1276 continue; 1277 } 1278 } 1279 predecessor = target; 1280 target = next; 1281 } 1282 } 1283 1284 // Update list of touch targets for pointer up or cancel, if needed. 1285 if (canceled || actionMasked == MotionEvent.ACTION_UP) { 1286 resetTouchState(); 1287 } else if (split && actionMasked == MotionEvent.ACTION_POINTER_UP) { 1288 final int actionIndex = ev.getActionIndex(); 1289 final int idBitsToRemove = 1 << ev.getPointerId(actionIndex); 1290 removePointersFromTouchTargets(idBitsToRemove); 1291 } 1292 1293 return handled; 1294 } 1295 1296 /** 1297 * Resets all touch state in preparation for a new cycle. 1298 */ 1299 private void resetTouchState() { 1300 clearTouchTargets(); 1301 resetCancelNextUpFlag(this); 1302 mGroupFlags &= ~FLAG_DISALLOW_INTERCEPT; 1303 } 1304 1305 /** 1306 * Resets the cancel next up flag. 1307 * Returns true if the flag was previously set. 1308 */ 1309 private boolean resetCancelNextUpFlag(View view) { 1310 if ((view.mPrivateFlags & CANCEL_NEXT_UP_EVENT) != 0) { 1311 view.mPrivateFlags &= ~CANCEL_NEXT_UP_EVENT; 1312 return true; 1313 } 1314 return false; 1315 } 1316 1317 /** 1318 * Clears all touch targets. 1319 */ 1320 private void clearTouchTargets() { 1321 TouchTarget target = mFirstTouchTarget; 1322 if (target != null) { 1323 do { 1324 TouchTarget next = target.next; 1325 target.recycle(); 1326 target = next; 1327 } while (target != null); 1328 mFirstTouchTarget = null; 1329 } 1330 } 1331 1332 /** 1333 * Cancels and clears all touch targets. 1334 */ 1335 private void cancelAndClearTouchTargets(MotionEvent event) { 1336 if (mFirstTouchTarget != null) { 1337 boolean syntheticEvent = false; 1338 if (event == null) { 1339 final long now = SystemClock.uptimeMillis(); 1340 event = MotionEvent.obtain(now, now, 1341 MotionEvent.ACTION_CANCEL, 0.0f, 0.0f, 0); 1342 syntheticEvent = true; 1343 } 1344 1345 for (TouchTarget target = mFirstTouchTarget; target != null; target = target.next) { 1346 resetCancelNextUpFlag(target.child); 1347 dispatchTransformedTouchEvent(event, true, target.child, target.pointerIdBits); 1348 } 1349 clearTouchTargets(); 1350 1351 if (syntheticEvent) { 1352 event.recycle(); 1353 } 1354 } 1355 } 1356 1357 /** 1358 * Gets the touch target for specified child view. 1359 * Returns null if not found. 1360 */ 1361 private TouchTarget getTouchTarget(View child) { 1362 for (TouchTarget target = mFirstTouchTarget; target != null; target = target.next) { 1363 if (target.child == child) { 1364 return target; 1365 } 1366 } 1367 return null; 1368 } 1369 1370 /** 1371 * Adds a touch target for specified child to the beginning of the list. 1372 * Assumes the target child is not already present. 1373 */ 1374 private TouchTarget addTouchTarget(View child, int pointerIdBits) { 1375 TouchTarget target = TouchTarget.obtain(child, pointerIdBits); 1376 target.next = mFirstTouchTarget; 1377 mFirstTouchTarget = target; 1378 return target; 1379 } 1380 1381 /** 1382 * Removes the pointer ids from consideration. 1383 */ 1384 private void removePointersFromTouchTargets(int pointerIdBits) { 1385 TouchTarget predecessor = null; 1386 TouchTarget target = mFirstTouchTarget; 1387 while (target != null) { 1388 final TouchTarget next = target.next; 1389 if ((target.pointerIdBits & pointerIdBits) != 0) { 1390 target.pointerIdBits &= ~pointerIdBits; 1391 if (target.pointerIdBits == 0) { 1392 if (predecessor == null) { 1393 mFirstTouchTarget = next; 1394 } else { 1395 predecessor.next = next; 1396 } 1397 target.recycle(); 1398 target = next; 1399 continue; 1400 } 1401 } 1402 predecessor = target; 1403 target = next; 1404 } 1405 } 1406 1407 /** 1408 * Returns true if a child view contains the specified point when transformed 1409 * into its coordinate space. 1410 * Child must not be null. 1411 * @hide 1412 */ 1413 protected boolean isTransformedTouchPointInView(float x, float y, View child, 1414 PointF outLocalPoint) { 1415 float localX = x + mScrollX - child.mLeft; 1416 float localY = y + mScrollY - child.mTop; 1417 if (! child.hasIdentityMatrix() && mAttachInfo != null) { 1418 final float[] localXY = mAttachInfo.mTmpTransformLocation; 1419 localXY[0] = localX; 1420 localXY[1] = localY; 1421 child.getInverseMatrix().mapPoints(localXY); 1422 localX = localXY[0]; 1423 localY = localXY[1]; 1424 } 1425 final boolean isInView = child.pointInView(localX, localY); 1426 if (isInView && outLocalPoint != null) { 1427 outLocalPoint.set(localX, localY); 1428 } 1429 return isInView; 1430 } 1431 1432 /** 1433 * Transforms a motion event into the coordinate space of a particular child view, 1434 * filters out irrelevant pointer ids, and overrides its action if necessary. 1435 * If child is null, assumes the MotionEvent will be sent to this ViewGroup instead. 1436 */ 1437 private boolean dispatchTransformedTouchEvent(MotionEvent event, boolean cancel, 1438 View child, int desiredPointerIdBits) { 1439 final boolean handled; 1440 1441 // Canceling motions is a special case. We don't need to perform any transformations 1442 // or filtering. The important part is the action, not the contents. 1443 final int oldAction = event.getAction(); 1444 if (cancel || oldAction == MotionEvent.ACTION_CANCEL) { 1445 event.setAction(MotionEvent.ACTION_CANCEL); 1446 if (child == null) { 1447 handled = super.dispatchTouchEvent(event); 1448 } else { 1449 handled = child.dispatchTouchEvent(event); 1450 } 1451 event.setAction(oldAction); 1452 return handled; 1453 } 1454 1455 // Calculate the number of pointers to deliver. 1456 final int oldPointerCount = event.getPointerCount(); 1457 int newPointerCount = 0; 1458 if (desiredPointerIdBits == TouchTarget.ALL_POINTER_IDS) { 1459 newPointerCount = oldPointerCount; 1460 } else { 1461 for (int i = 0; i < oldPointerCount; i++) { 1462 final int pointerId = event.getPointerId(i); 1463 final int pointerIdBit = 1 << pointerId; 1464 if ((pointerIdBit & desiredPointerIdBits) != 0) { 1465 newPointerCount += 1; 1466 } 1467 } 1468 } 1469 1470 // If for some reason we ended up in an inconsistent state where it looks like we 1471 // might produce a motion event with no pointers in it, then drop the event. 1472 if (newPointerCount == 0) { 1473 return false; 1474 } 1475 1476 // If the number of pointers is the same and we don't need to perform any fancy 1477 // irreversible transformations, then we can reuse the motion event for this 1478 // dispatch as long as we are careful to revert any changes we make. 1479 final boolean reuse = newPointerCount == oldPointerCount 1480 && (child == null || child.hasIdentityMatrix()); 1481 if (reuse) { 1482 if (child == null) { 1483 handled = super.dispatchTouchEvent(event); 1484 } else { 1485 final float offsetX = mScrollX - child.mLeft; 1486 final float offsetY = mScrollY - child.mTop; 1487 event.offsetLocation(offsetX, offsetY); 1488 1489 handled = child.dispatchTouchEvent(event); 1490 1491 event.offsetLocation(-offsetX, -offsetY); 1492 } 1493 return handled; 1494 } 1495 1496 // Make a copy of the event. 1497 // If the number of pointers is different, then we need to filter out irrelevant pointers 1498 // as we make a copy of the motion event. 1499 MotionEvent transformedEvent; 1500 if (newPointerCount == oldPointerCount) { 1501 transformedEvent = MotionEvent.obtain(event); 1502 } else { 1503 growTmpPointerArrays(newPointerCount); 1504 final int[] newPointerIndexMap = mTmpPointerIndexMap; 1505 final int[] newPointerIds = mTmpPointerIds; 1506 final MotionEvent.PointerCoords[] newPointerCoords = mTmpPointerCoords; 1507 1508 int newPointerIndex = 0; 1509 int oldPointerIndex = 0; 1510 while (newPointerIndex < newPointerCount) { 1511 final int pointerId = event.getPointerId(oldPointerIndex); 1512 final int pointerIdBits = 1 << pointerId; 1513 if ((pointerIdBits & desiredPointerIdBits) != 0) { 1514 newPointerIndexMap[newPointerIndex] = oldPointerIndex; 1515 newPointerIds[newPointerIndex] = pointerId; 1516 if (newPointerCoords[newPointerIndex] == null) { 1517 newPointerCoords[newPointerIndex] = new MotionEvent.PointerCoords(); 1518 } 1519 1520 newPointerIndex += 1; 1521 } 1522 oldPointerIndex += 1; 1523 } 1524 1525 final int newAction; 1526 if (cancel) { 1527 newAction = MotionEvent.ACTION_CANCEL; 1528 } else { 1529 final int oldMaskedAction = oldAction & MotionEvent.ACTION_MASK; 1530 if (oldMaskedAction == MotionEvent.ACTION_POINTER_DOWN 1531 || oldMaskedAction == MotionEvent.ACTION_POINTER_UP) { 1532 final int changedPointerId = event.getPointerId( 1533 (oldAction & MotionEvent.ACTION_POINTER_INDEX_MASK) 1534 >> MotionEvent.ACTION_POINTER_INDEX_SHIFT); 1535 final int changedPointerIdBits = 1 << changedPointerId; 1536 if ((changedPointerIdBits & desiredPointerIdBits) != 0) { 1537 if (newPointerCount == 1) { 1538 // The first/last pointer went down/up. 1539 newAction = oldMaskedAction == MotionEvent.ACTION_POINTER_DOWN 1540 ? MotionEvent.ACTION_DOWN : MotionEvent.ACTION_UP; 1541 } else { 1542 // A secondary pointer went down/up. 1543 int newChangedPointerIndex = 0; 1544 while (newPointerIds[newChangedPointerIndex] != changedPointerId) { 1545 newChangedPointerIndex += 1; 1546 } 1547 newAction = oldMaskedAction | (newChangedPointerIndex 1548 << MotionEvent.ACTION_POINTER_INDEX_SHIFT); 1549 } 1550 } else { 1551 // An unrelated pointer changed. 1552 newAction = MotionEvent.ACTION_MOVE; 1553 } 1554 } else { 1555 // Simple up/down/cancel/move motion action. 1556 newAction = oldMaskedAction; 1557 } 1558 } 1559 1560 transformedEvent = null; 1561 final int historySize = event.getHistorySize(); 1562 for (int historyIndex = 0; historyIndex <= historySize; historyIndex++) { 1563 for (newPointerIndex = 0; newPointerIndex < newPointerCount; newPointerIndex++) { 1564 final MotionEvent.PointerCoords c = newPointerCoords[newPointerIndex]; 1565 oldPointerIndex = newPointerIndexMap[newPointerIndex]; 1566 if (historyIndex != historySize) { 1567 event.getHistoricalPointerCoords(oldPointerIndex, historyIndex, c); 1568 } else { 1569 event.getPointerCoords(oldPointerIndex, c); 1570 } 1571 } 1572 1573 final long eventTime; 1574 if (historyIndex != historySize) { 1575 eventTime = event.getHistoricalEventTime(historyIndex); 1576 } else { 1577 eventTime = event.getEventTime(); 1578 } 1579 1580 if (transformedEvent == null) { 1581 transformedEvent = MotionEvent.obtain( 1582 event.getDownTime(), eventTime, newAction, 1583 newPointerCount, newPointerIds, newPointerCoords, 1584 event.getMetaState(), event.getXPrecision(), event.getYPrecision(), 1585 event.getDeviceId(), event.getEdgeFlags(), event.getSource(), 1586 event.getFlags()); 1587 } else { 1588 transformedEvent.addBatch(eventTime, newPointerCoords, 0); 1589 } 1590 } 1591 } 1592 1593 // Perform any necessary transformations and dispatch. 1594 if (child == null) { 1595 handled = super.dispatchTouchEvent(transformedEvent); 1596 } else { 1597 final float offsetX = mScrollX - child.mLeft; 1598 final float offsetY = mScrollY - child.mTop; 1599 transformedEvent.offsetLocation(offsetX, offsetY); 1600 if (! child.hasIdentityMatrix()) { 1601 transformedEvent.transform(child.getInverseMatrix()); 1602 } 1603 1604 handled = child.dispatchTouchEvent(transformedEvent); 1605 } 1606 1607 // Done. 1608 transformedEvent.recycle(); 1609 return handled; 1610 } 1611 1612 /** 1613 * Enlarge the temporary pointer arrays for splitting pointers. 1614 * May discard contents (but keeps PointerCoords objects to avoid reallocating them). 1615 */ 1616 private void growTmpPointerArrays(int desiredCapacity) { 1617 final MotionEvent.PointerCoords[] oldTmpPointerCoords = mTmpPointerCoords; 1618 int capacity; 1619 if (oldTmpPointerCoords != null) { 1620 capacity = oldTmpPointerCoords.length; 1621 if (desiredCapacity <= capacity) { 1622 return; 1623 } 1624 } else { 1625 capacity = 4; 1626 } 1627 1628 while (capacity < desiredCapacity) { 1629 capacity *= 2; 1630 } 1631 1632 mTmpPointerIndexMap = new int[capacity]; 1633 mTmpPointerIds = new int[capacity]; 1634 mTmpPointerCoords = new MotionEvent.PointerCoords[capacity]; 1635 1636 if (oldTmpPointerCoords != null) { 1637 System.arraycopy(oldTmpPointerCoords, 0, mTmpPointerCoords, 0, 1638 oldTmpPointerCoords.length); 1639 } 1640 } 1641 1642 /** 1643 * Enable or disable the splitting of MotionEvents to multiple children during touch event 1644 * dispatch. This behavior is enabled by default for applications that target an 1645 * SDK version of {@link Build.VERSION_CODES#HONEYCOMB} or newer. 1646 * 1647 * <p>When this option is enabled MotionEvents may be split and dispatched to different child 1648 * views depending on where each pointer initially went down. This allows for user interactions 1649 * such as scrolling two panes of content independently, chording of buttons, and performing 1650 * independent gestures on different pieces of content. 1651 * 1652 * @param split <code>true</code> to allow MotionEvents to be split and dispatched to multiple 1653 * child views. <code>false</code> to only allow one child view to be the target of 1654 * any MotionEvent received by this ViewGroup. 1655 */ 1656 public void setMotionEventSplittingEnabled(boolean split) { 1657 // TODO Applications really shouldn't change this setting mid-touch event, 1658 // but perhaps this should handle that case and send ACTION_CANCELs to any child views 1659 // with gestures in progress when this is changed. 1660 if (split) { 1661 mGroupFlags |= FLAG_SPLIT_MOTION_EVENTS; 1662 } else { 1663 mGroupFlags &= ~FLAG_SPLIT_MOTION_EVENTS; 1664 } 1665 } 1666 1667 /** 1668 * Returns true if MotionEvents dispatched to this ViewGroup can be split to multiple children. 1669 * @return true if MotionEvents dispatched to this ViewGroup can be split to multiple children. 1670 */ 1671 public boolean isMotionEventSplittingEnabled() { 1672 return (mGroupFlags & FLAG_SPLIT_MOTION_EVENTS) == FLAG_SPLIT_MOTION_EVENTS; 1673 } 1674 1675 /** 1676 * {@inheritDoc} 1677 */ 1678 public void requestDisallowInterceptTouchEvent(boolean disallowIntercept) { 1679 1680 if (disallowIntercept == ((mGroupFlags & FLAG_DISALLOW_INTERCEPT) != 0)) { 1681 // We're already in this state, assume our ancestors are too 1682 return; 1683 } 1684 1685 if (disallowIntercept) { 1686 mGroupFlags |= FLAG_DISALLOW_INTERCEPT; 1687 } else { 1688 mGroupFlags &= ~FLAG_DISALLOW_INTERCEPT; 1689 } 1690 1691 // Pass it up to our parent 1692 if (mParent != null) { 1693 mParent.requestDisallowInterceptTouchEvent(disallowIntercept); 1694 } 1695 } 1696 1697 /** 1698 * Implement this method to intercept all touch screen motion events. This 1699 * allows you to watch events as they are dispatched to your children, and 1700 * take ownership of the current gesture at any point. 1701 * 1702 * <p>Using this function takes some care, as it has a fairly complicated 1703 * interaction with {@link View#onTouchEvent(MotionEvent) 1704 * View.onTouchEvent(MotionEvent)}, and using it requires implementing 1705 * that method as well as this one in the correct way. Events will be 1706 * received in the following order: 1707 * 1708 * <ol> 1709 * <li> You will receive the down event here. 1710 * <li> The down event will be handled either by a child of this view 1711 * group, or given to your own onTouchEvent() method to handle; this means 1712 * you should implement onTouchEvent() to return true, so you will 1713 * continue to see the rest of the gesture (instead of looking for 1714 * a parent view to handle it). Also, by returning true from 1715 * onTouchEvent(), you will not receive any following 1716 * events in onInterceptTouchEvent() and all touch processing must 1717 * happen in onTouchEvent() like normal. 1718 * <li> For as long as you return false from this function, each following 1719 * event (up to and including the final up) will be delivered first here 1720 * and then to the target's onTouchEvent(). 1721 * <li> If you return true from here, you will not receive any 1722 * following events: the target view will receive the same event but 1723 * with the action {@link MotionEvent#ACTION_CANCEL}, and all further 1724 * events will be delivered to your onTouchEvent() method and no longer 1725 * appear here. 1726 * </ol> 1727 * 1728 * @param ev The motion event being dispatched down the hierarchy. 1729 * @return Return true to steal motion events from the children and have 1730 * them dispatched to this ViewGroup through onTouchEvent(). 1731 * The current target will receive an ACTION_CANCEL event, and no further 1732 * messages will be delivered here. 1733 */ 1734 public boolean onInterceptTouchEvent(MotionEvent ev) { 1735 return false; 1736 } 1737 1738 /** 1739 * {@inheritDoc} 1740 * 1741 * Looks for a view to give focus to respecting the setting specified by 1742 * {@link #getDescendantFocusability()}. 1743 * 1744 * Uses {@link #onRequestFocusInDescendants(int, android.graphics.Rect)} to 1745 * find focus within the children of this group when appropriate. 1746 * 1747 * @see #FOCUS_BEFORE_DESCENDANTS 1748 * @see #FOCUS_AFTER_DESCENDANTS 1749 * @see #FOCUS_BLOCK_DESCENDANTS 1750 * @see #onRequestFocusInDescendants 1751 */ 1752 @Override 1753 public boolean requestFocus(int direction, Rect previouslyFocusedRect) { 1754 if (DBG) { 1755 System.out.println(this + " ViewGroup.requestFocus direction=" 1756 + direction); 1757 } 1758 int descendantFocusability = getDescendantFocusability(); 1759 1760 switch (descendantFocusability) { 1761 case FOCUS_BLOCK_DESCENDANTS: 1762 return super.requestFocus(direction, previouslyFocusedRect); 1763 case FOCUS_BEFORE_DESCENDANTS: { 1764 final boolean took = super.requestFocus(direction, previouslyFocusedRect); 1765 return took ? took : onRequestFocusInDescendants(direction, previouslyFocusedRect); 1766 } 1767 case FOCUS_AFTER_DESCENDANTS: { 1768 final boolean took = onRequestFocusInDescendants(direction, previouslyFocusedRect); 1769 return took ? took : super.requestFocus(direction, previouslyFocusedRect); 1770 } 1771 default: 1772 throw new IllegalStateException("descendant focusability must be " 1773 + "one of FOCUS_BEFORE_DESCENDANTS, FOCUS_AFTER_DESCENDANTS, FOCUS_BLOCK_DESCENDANTS " 1774 + "but is " + descendantFocusability); 1775 } 1776 } 1777 1778 /** 1779 * Look for a descendant to call {@link View#requestFocus} on. 1780 * Called by {@link ViewGroup#requestFocus(int, android.graphics.Rect)} 1781 * when it wants to request focus within its children. Override this to 1782 * customize how your {@link ViewGroup} requests focus within its children. 1783 * @param direction One of FOCUS_UP, FOCUS_DOWN, FOCUS_LEFT, and FOCUS_RIGHT 1784 * @param previouslyFocusedRect The rectangle (in this View's coordinate system) 1785 * to give a finer grained hint about where focus is coming from. May be null 1786 * if there is no hint. 1787 * @return Whether focus was taken. 1788 */ 1789 @SuppressWarnings({"ConstantConditions"}) 1790 protected boolean onRequestFocusInDescendants(int direction, 1791 Rect previouslyFocusedRect) { 1792 int index; 1793 int increment; 1794 int end; 1795 int count = mChildrenCount; 1796 if ((direction & FOCUS_FORWARD) != 0) { 1797 index = 0; 1798 increment = 1; 1799 end = count; 1800 } else { 1801 index = count - 1; 1802 increment = -1; 1803 end = -1; 1804 } 1805 final View[] children = mChildren; 1806 for (int i = index; i != end; i += increment) { 1807 View child = children[i]; 1808 if ((child.mViewFlags & VISIBILITY_MASK) == VISIBLE) { 1809 if (child.requestFocus(direction, previouslyFocusedRect)) { 1810 return true; 1811 } 1812 } 1813 } 1814 return false; 1815 } 1816 1817 /** 1818 * {@inheritDoc} 1819 * 1820 * @hide 1821 */ 1822 @Override 1823 public void dispatchStartTemporaryDetach() { 1824 super.dispatchStartTemporaryDetach(); 1825 final int count = mChildrenCount; 1826 final View[] children = mChildren; 1827 for (int i = 0; i < count; i++) { 1828 children[i].dispatchStartTemporaryDetach(); 1829 } 1830 } 1831 1832 /** 1833 * {@inheritDoc} 1834 * 1835 * @hide 1836 */ 1837 @Override 1838 public void dispatchFinishTemporaryDetach() { 1839 super.dispatchFinishTemporaryDetach(); 1840 final int count = mChildrenCount; 1841 final View[] children = mChildren; 1842 for (int i = 0; i < count; i++) { 1843 children[i].dispatchFinishTemporaryDetach(); 1844 } 1845 } 1846 1847 /** 1848 * {@inheritDoc} 1849 */ 1850 @Override 1851 void dispatchAttachedToWindow(AttachInfo info, int visibility) { 1852 super.dispatchAttachedToWindow(info, visibility); 1853 visibility |= mViewFlags & VISIBILITY_MASK; 1854 final int count = mChildrenCount; 1855 final View[] children = mChildren; 1856 for (int i = 0; i < count; i++) { 1857 children[i].dispatchAttachedToWindow(info, visibility); 1858 } 1859 } 1860 1861 @Override 1862 public boolean dispatchPopulateAccessibilityEvent(AccessibilityEvent event) { 1863 boolean populated = false; 1864 for (int i = 0, count = getChildCount(); i < count; i++) { 1865 populated |= getChildAt(i).dispatchPopulateAccessibilityEvent(event); 1866 } 1867 return populated; 1868 } 1869 1870 /** 1871 * {@inheritDoc} 1872 */ 1873 @Override 1874 void dispatchDetachedFromWindow() { 1875 // If we still have a touch target, we are still in the process of 1876 // dispatching motion events to a child; we need to get rid of that 1877 // child to avoid dispatching events to it after the window is torn 1878 // down. To make sure we keep the child in a consistent state, we 1879 // first send it an ACTION_CANCEL motion event. 1880 cancelAndClearTouchTargets(null); 1881 1882 // In case view is detached while transition is running 1883 mLayoutSuppressed = false; 1884 1885 // Tear down our drag tracking 1886 mDragNotifiedChildren = null; 1887 if (mCurrentDrag != null) { 1888 mCurrentDrag.recycle(); 1889 mCurrentDrag = null; 1890 } 1891 1892 final int count = mChildrenCount; 1893 final View[] children = mChildren; 1894 for (int i = 0; i < count; i++) { 1895 children[i].dispatchDetachedFromWindow(); 1896 } 1897 super.dispatchDetachedFromWindow(); 1898 } 1899 1900 /** 1901 * {@inheritDoc} 1902 */ 1903 @Override 1904 public void setPadding(int left, int top, int right, int bottom) { 1905 super.setPadding(left, top, right, bottom); 1906 1907 if ((mPaddingLeft | mPaddingTop | mPaddingRight | mPaddingRight) != 0) { 1908 mGroupFlags |= FLAG_PADDING_NOT_NULL; 1909 } else { 1910 mGroupFlags &= ~FLAG_PADDING_NOT_NULL; 1911 } 1912 } 1913 1914 /** 1915 * {@inheritDoc} 1916 */ 1917 @Override 1918 protected void dispatchSaveInstanceState(SparseArray<Parcelable> container) { 1919 super.dispatchSaveInstanceState(container); 1920 final int count = mChildrenCount; 1921 final View[] children = mChildren; 1922 for (int i = 0; i < count; i++) { 1923 View c = children[i]; 1924 if ((c.mViewFlags & PARENT_SAVE_DISABLED_MASK) != PARENT_SAVE_DISABLED) { 1925 c.dispatchSaveInstanceState(container); 1926 } 1927 } 1928 } 1929 1930 /** 1931 * Perform dispatching of a {@link #saveHierarchyState freeze()} to only this view, 1932 * not to its children. For use when overriding 1933 * {@link #dispatchSaveInstanceState dispatchFreeze()} to allow subclasses to freeze 1934 * their own state but not the state of their children. 1935 * 1936 * @param container the container 1937 */ 1938 protected void dispatchFreezeSelfOnly(SparseArray<Parcelable> container) { 1939 super.dispatchSaveInstanceState(container); 1940 } 1941 1942 /** 1943 * {@inheritDoc} 1944 */ 1945 @Override 1946 protected void dispatchRestoreInstanceState(SparseArray<Parcelable> container) { 1947 super.dispatchRestoreInstanceState(container); 1948 final int count = mChildrenCount; 1949 final View[] children = mChildren; 1950 for (int i = 0; i < count; i++) { 1951 View c = children[i]; 1952 if ((c.mViewFlags & PARENT_SAVE_DISABLED_MASK) != PARENT_SAVE_DISABLED) { 1953 c.dispatchRestoreInstanceState(container); 1954 } 1955 } 1956 } 1957 1958 /** 1959 * Perform dispatching of a {@link #restoreHierarchyState thaw()} to only this view, 1960 * not to its children. For use when overriding 1961 * {@link #dispatchRestoreInstanceState dispatchThaw()} to allow subclasses to thaw 1962 * their own state but not the state of their children. 1963 * 1964 * @param container the container 1965 */ 1966 protected void dispatchThawSelfOnly(SparseArray<Parcelable> container) { 1967 super.dispatchRestoreInstanceState(container); 1968 } 1969 1970 /** 1971 * Enables or disables the drawing cache for each child of this view group. 1972 * 1973 * @param enabled true to enable the cache, false to dispose of it 1974 */ 1975 protected void setChildrenDrawingCacheEnabled(boolean enabled) { 1976 if (enabled || (mPersistentDrawingCache & PERSISTENT_ALL_CACHES) != PERSISTENT_ALL_CACHES) { 1977 final View[] children = mChildren; 1978 final int count = mChildrenCount; 1979 for (int i = 0; i < count; i++) { 1980 children[i].setDrawingCacheEnabled(enabled); 1981 } 1982 } 1983 } 1984 1985 @Override 1986 protected void onAnimationStart() { 1987 super.onAnimationStart(); 1988 1989 // When this ViewGroup's animation starts, build the cache for the children 1990 if ((mGroupFlags & FLAG_ANIMATION_CACHE) == FLAG_ANIMATION_CACHE) { 1991 final int count = mChildrenCount; 1992 final View[] children = mChildren; 1993 final boolean buildCache = !isHardwareAccelerated(); 1994 1995 for (int i = 0; i < count; i++) { 1996 final View child = children[i]; 1997 if ((child.mViewFlags & VISIBILITY_MASK) == VISIBLE) { 1998 child.setDrawingCacheEnabled(true); 1999 if (buildCache) { 2000 child.buildDrawingCache(true); 2001 } 2002 } 2003 } 2004 2005 mGroupFlags |= FLAG_CHILDREN_DRAWN_WITH_CACHE; 2006 } 2007 } 2008 2009 @Override 2010 protected void onAnimationEnd() { 2011 super.onAnimationEnd(); 2012 2013 // When this ViewGroup's animation ends, destroy the cache of the children 2014 if ((mGroupFlags & FLAG_ANIMATION_CACHE) == FLAG_ANIMATION_CACHE) { 2015 mGroupFlags &= ~FLAG_CHILDREN_DRAWN_WITH_CACHE; 2016 2017 if ((mPersistentDrawingCache & PERSISTENT_ANIMATION_CACHE) == 0) { 2018 setChildrenDrawingCacheEnabled(false); 2019 } 2020 } 2021 } 2022 2023 @Override 2024 Bitmap createSnapshot(Bitmap.Config quality, int backgroundColor, boolean skipChildren) { 2025 int count = mChildrenCount; 2026 int[] visibilities = null; 2027 2028 if (skipChildren) { 2029 visibilities = new int[count]; 2030 for (int i = 0; i < count; i++) { 2031 View child = getChildAt(i); 2032 visibilities[i] = child.getVisibility(); 2033 if (visibilities[i] == View.VISIBLE) { 2034 child.setVisibility(INVISIBLE); 2035 } 2036 } 2037 } 2038 2039 Bitmap b = super.createSnapshot(quality, backgroundColor, skipChildren); 2040 2041 if (skipChildren) { 2042 for (int i = 0; i < count; i++) { 2043 getChildAt(i).setVisibility(visibilities[i]); 2044 } 2045 } 2046 2047 return b; 2048 } 2049 2050 /** 2051 * {@inheritDoc} 2052 */ 2053 @Override 2054 protected void dispatchDraw(Canvas canvas) { 2055 final int count = mChildrenCount; 2056 final View[] children = mChildren; 2057 int flags = mGroupFlags; 2058 2059 if ((flags & FLAG_RUN_ANIMATION) != 0 && canAnimate()) { 2060 final boolean cache = (mGroupFlags & FLAG_ANIMATION_CACHE) == FLAG_ANIMATION_CACHE; 2061 2062 final boolean buildCache = !isHardwareAccelerated(); 2063 for (int i = 0; i < count; i++) { 2064 final View child = children[i]; 2065 if ((child.mViewFlags & VISIBILITY_MASK) == VISIBLE) { 2066 final LayoutParams params = child.getLayoutParams(); 2067 attachLayoutAnimationParameters(child, params, i, count); 2068 bindLayoutAnimation(child); 2069 if (cache) { 2070 child.setDrawingCacheEnabled(true); 2071 if (buildCache) { 2072 child.buildDrawingCache(true); 2073 } 2074 } 2075 } 2076 } 2077 2078 final LayoutAnimationController controller = mLayoutAnimationController; 2079 if (controller.willOverlap()) { 2080 mGroupFlags |= FLAG_OPTIMIZE_INVALIDATE; 2081 } 2082 2083 controller.start(); 2084 2085 mGroupFlags &= ~FLAG_RUN_ANIMATION; 2086 mGroupFlags &= ~FLAG_ANIMATION_DONE; 2087 2088 if (cache) { 2089 mGroupFlags |= FLAG_CHILDREN_DRAWN_WITH_CACHE; 2090 } 2091 2092 if (mAnimationListener != null) { 2093 mAnimationListener.onAnimationStart(controller.getAnimation()); 2094 } 2095 } 2096 2097 int saveCount = 0; 2098 final boolean clipToPadding = (flags & CLIP_TO_PADDING_MASK) == CLIP_TO_PADDING_MASK; 2099 if (clipToPadding) { 2100 saveCount = canvas.save(); 2101 canvas.clipRect(mScrollX + mPaddingLeft, mScrollY + mPaddingTop, 2102 mScrollX + mRight - mLeft - mPaddingRight, 2103 mScrollY + mBottom - mTop - mPaddingBottom); 2104 2105 } 2106 2107 // We will draw our child's animation, let's reset the flag 2108 mPrivateFlags &= ~DRAW_ANIMATION; 2109 mGroupFlags &= ~FLAG_INVALIDATE_REQUIRED; 2110 2111 boolean more = false; 2112 final long drawingTime = getDrawingTime(); 2113 2114 if ((flags & FLAG_USE_CHILD_DRAWING_ORDER) == 0) { 2115 for (int i = 0; i < count; i++) { 2116 final View child = children[i]; 2117 if ((child.mViewFlags & VISIBILITY_MASK) == VISIBLE || child.getAnimation() != null) { 2118 more |= drawChild(canvas, child, drawingTime); 2119 } 2120 } 2121 } else { 2122 for (int i = 0; i < count; i++) { 2123 final View child = children[getChildDrawingOrder(count, i)]; 2124 if ((child.mViewFlags & VISIBILITY_MASK) == VISIBLE || child.getAnimation() != null) { 2125 more |= drawChild(canvas, child, drawingTime); 2126 } 2127 } 2128 } 2129 2130 // Draw any disappearing views that have animations 2131 if (mDisappearingChildren != null) { 2132 final ArrayList<View> disappearingChildren = mDisappearingChildren; 2133 final int disappearingCount = disappearingChildren.size() - 1; 2134 // Go backwards -- we may delete as animations finish 2135 for (int i = disappearingCount; i >= 0; i--) { 2136 final View child = disappearingChildren.get(i); 2137 more |= drawChild(canvas, child, drawingTime); 2138 } 2139 } 2140 2141 if (clipToPadding) { 2142 canvas.restoreToCount(saveCount); 2143 } 2144 2145 // mGroupFlags might have been updated by drawChild() 2146 flags = mGroupFlags; 2147 2148 if ((flags & FLAG_INVALIDATE_REQUIRED) == FLAG_INVALIDATE_REQUIRED) { 2149 invalidate(); 2150 } 2151 2152 if ((flags & FLAG_ANIMATION_DONE) == 0 && (flags & FLAG_NOTIFY_ANIMATION_LISTENER) == 0 && 2153 mLayoutAnimationController.isDone() && !more) { 2154 // We want to erase the drawing cache and notify the listener after the 2155 // next frame is drawn because one extra invalidate() is caused by 2156 // drawChild() after the animation is over 2157 mGroupFlags |= FLAG_NOTIFY_ANIMATION_LISTENER; 2158 final Runnable end = new Runnable() { 2159 public void run() { 2160 notifyAnimationListener(); 2161 } 2162 }; 2163 post(end); 2164 } 2165 } 2166 2167 /** 2168 * Returns the index of the child to draw for this iteration. Override this 2169 * if you want to change the drawing order of children. By default, it 2170 * returns i. 2171 * <p> 2172 * NOTE: In order for this method to be called, you must enable child ordering 2173 * first by calling {@link #setChildrenDrawingOrderEnabled(boolean)}. 2174 * 2175 * @param i The current iteration. 2176 * @return The index of the child to draw this iteration. 2177 * 2178 * @see #setChildrenDrawingOrderEnabled(boolean) 2179 * @see #isChildrenDrawingOrderEnabled() 2180 */ 2181 protected int getChildDrawingOrder(int childCount, int i) { 2182 return i; 2183 } 2184 2185 private void notifyAnimationListener() { 2186 mGroupFlags &= ~FLAG_NOTIFY_ANIMATION_LISTENER; 2187 mGroupFlags |= FLAG_ANIMATION_DONE; 2188 2189 if (mAnimationListener != null) { 2190 final Runnable end = new Runnable() { 2191 public void run() { 2192 mAnimationListener.onAnimationEnd(mLayoutAnimationController.getAnimation()); 2193 } 2194 }; 2195 post(end); 2196 } 2197 2198 if ((mGroupFlags & FLAG_ANIMATION_CACHE) == FLAG_ANIMATION_CACHE) { 2199 mGroupFlags &= ~FLAG_CHILDREN_DRAWN_WITH_CACHE; 2200 if ((mPersistentDrawingCache & PERSISTENT_ANIMATION_CACHE) == 0) { 2201 setChildrenDrawingCacheEnabled(false); 2202 } 2203 } 2204 2205 invalidate(); 2206 } 2207 2208 /** 2209 * This method is used to cause children of this ViewGroup to restore or recreate their 2210 * display lists. It is called by getDisplayList() when the parent ViewGroup does not need 2211 * to recreate its own display list, which would happen if it went through the normal 2212 * draw/dispatchDraw mechanisms. 2213 * 2214 * @hide 2215 */ 2216 @Override 2217 protected void dispatchGetDisplayList() { 2218 final int count = mChildrenCount; 2219 final View[] children = mChildren; 2220 for (int i = 0; i < count; i++) { 2221 final View child = children[i]; 2222 child.mRecreateDisplayList = (child.mPrivateFlags & INVALIDATED) == INVALIDATED; 2223 child.mPrivateFlags &= ~INVALIDATED; 2224 child.getDisplayList(); 2225 child.mRecreateDisplayList = false; 2226 } 2227 } 2228 2229 /** 2230 * Draw one child of this View Group. This method is responsible for getting 2231 * the canvas in the right state. This includes clipping, translating so 2232 * that the child's scrolled origin is at 0, 0, and applying any animation 2233 * transformations. 2234 * 2235 * @param canvas The canvas on which to draw the child 2236 * @param child Who to draw 2237 * @param drawingTime The time at which draw is occuring 2238 * @return True if an invalidate() was issued 2239 */ 2240 protected boolean drawChild(Canvas canvas, View child, long drawingTime) { 2241 boolean more = false; 2242 2243 final int cl = child.mLeft; 2244 final int ct = child.mTop; 2245 final int cr = child.mRight; 2246 final int cb = child.mBottom; 2247 2248 final boolean childHasIdentityMatrix = child.hasIdentityMatrix(); 2249 2250 final int flags = mGroupFlags; 2251 2252 if ((flags & FLAG_CLEAR_TRANSFORMATION) == FLAG_CLEAR_TRANSFORMATION) { 2253 mChildTransformation.clear(); 2254 mGroupFlags &= ~FLAG_CLEAR_TRANSFORMATION; 2255 } 2256 2257 Transformation transformToApply = null; 2258 Transformation invalidationTransform; 2259 final Animation a = child.getAnimation(); 2260 boolean concatMatrix = false; 2261 2262 boolean scalingRequired = false; 2263 boolean caching; 2264 int layerType = child.getLayerType(); 2265 2266 if ((flags & FLAG_CHILDREN_DRAWN_WITH_CACHE) == FLAG_CHILDREN_DRAWN_WITH_CACHE || 2267 (flags & FLAG_ALWAYS_DRAWN_WITH_CACHE) == FLAG_ALWAYS_DRAWN_WITH_CACHE) { 2268 caching = true; 2269 if (mAttachInfo != null) scalingRequired = mAttachInfo.mScalingRequired; 2270 } else { 2271 caching = (layerType != LAYER_TYPE_NONE) || canvas.isHardwareAccelerated(); 2272 } 2273 2274 if (a != null) { 2275 final boolean initialized = a.isInitialized(); 2276 if (!initialized) { 2277 a.initialize(cr - cl, cb - ct, getWidth(), getHeight()); 2278 a.initializeInvalidateRegion(0, 0, cr - cl, cb - ct); 2279 child.onAnimationStart(); 2280 } 2281 2282 more = a.getTransformation(drawingTime, mChildTransformation, 2283 scalingRequired ? mAttachInfo.mApplicationScale : 1f); 2284 if (scalingRequired && mAttachInfo.mApplicationScale != 1f) { 2285 if (mInvalidationTransformation == null) { 2286 mInvalidationTransformation = new Transformation(); 2287 } 2288 invalidationTransform = mInvalidationTransformation; 2289 a.getTransformation(drawingTime, invalidationTransform, 1f); 2290 } else { 2291 invalidationTransform = mChildTransformation; 2292 } 2293 transformToApply = mChildTransformation; 2294 2295 concatMatrix = a.willChangeTransformationMatrix(); 2296 2297 if (more) { 2298 if (!a.willChangeBounds()) { 2299 if ((flags & (FLAG_OPTIMIZE_INVALIDATE | FLAG_ANIMATION_DONE)) == 2300 FLAG_OPTIMIZE_INVALIDATE) { 2301 mGroupFlags |= FLAG_INVALIDATE_REQUIRED; 2302 } else if ((flags & FLAG_INVALIDATE_REQUIRED) == 0) { 2303 // The child need to draw an animation, potentially offscreen, so 2304 // make sure we do not cancel invalidate requests 2305 mPrivateFlags |= DRAW_ANIMATION; 2306 invalidate(cl, ct, cr, cb); 2307 } 2308 } else { 2309 if (mInvalidateRegion == null) { 2310 mInvalidateRegion = new RectF(); 2311 } 2312 final RectF region = mInvalidateRegion; 2313 a.getInvalidateRegion(0, 0, cr - cl, cb - ct, region, invalidationTransform); 2314 2315 // The child need to draw an animation, potentially offscreen, so 2316 // make sure we do not cancel invalidate requests 2317 mPrivateFlags |= DRAW_ANIMATION; 2318 2319 final int left = cl + (int) region.left; 2320 final int top = ct + (int) region.top; 2321 invalidate(left, top, left + (int) region.width(), top + (int) region.height()); 2322 } 2323 } 2324 } else if ((flags & FLAG_SUPPORT_STATIC_TRANSFORMATIONS) == 2325 FLAG_SUPPORT_STATIC_TRANSFORMATIONS) { 2326 final boolean hasTransform = getChildStaticTransformation(child, mChildTransformation); 2327 if (hasTransform) { 2328 final int transformType = mChildTransformation.getTransformationType(); 2329 transformToApply = transformType != Transformation.TYPE_IDENTITY ? 2330 mChildTransformation : null; 2331 concatMatrix = (transformType & Transformation.TYPE_MATRIX) != 0; 2332 } 2333 } 2334 2335 concatMatrix |= !childHasIdentityMatrix; 2336 2337 // Sets the flag as early as possible to allow draw() implementations 2338 // to call invalidate() successfully when doing animations 2339 child.mPrivateFlags |= DRAWN; 2340 2341 if (!concatMatrix && canvas.quickReject(cl, ct, cr, cb, Canvas.EdgeType.BW) && 2342 (child.mPrivateFlags & DRAW_ANIMATION) == 0) { 2343 return more; 2344 } 2345 2346 float alpha = child.getAlpha(); 2347 // Bail out early if the view does not need to be drawn 2348 if (alpha <= ViewConfiguration.ALPHA_THRESHOLD && (child.mPrivateFlags & ALPHA_SET) == 0 && 2349 !(child instanceof SurfaceView)) { 2350 return more; 2351 } 2352 2353 if (canvas.isHardwareAccelerated()) { 2354 // Clear INVALIDATED flag to allow invalidation to occur during rendering, but 2355 // retain the flag's value temporarily in the mRecreateDisplayList flag 2356 child.mRecreateDisplayList = (child.mPrivateFlags & INVALIDATED) == INVALIDATED; 2357 child.mPrivateFlags &= ~INVALIDATED; 2358 } 2359 2360 child.computeScroll(); 2361 2362 final int sx = child.mScrollX; 2363 final int sy = child.mScrollY; 2364 2365 DisplayList displayList = null; 2366 Bitmap cache = null; 2367 if (caching) { 2368 if (!canvas.isHardwareAccelerated()) { 2369 if (layerType != LAYER_TYPE_NONE) { 2370 layerType = LAYER_TYPE_SOFTWARE; 2371 child.buildDrawingCache(true); 2372 } 2373 cache = child.getDrawingCache(true); 2374 } else { 2375 if (layerType == LAYER_TYPE_SOFTWARE) { 2376 child.buildDrawingCache(true); 2377 cache = child.getDrawingCache(true); 2378 } else if (layerType == LAYER_TYPE_NONE) { 2379 displayList = child.getDisplayList(); 2380 } 2381 } 2382 } 2383 2384 final boolean hasDisplayList = displayList != null && displayList.isReady(); 2385 final boolean hasNoCache = cache == null || hasDisplayList; 2386 2387 final int restoreTo = canvas.save(); 2388 if (cache == null && !hasDisplayList) { 2389 canvas.translate(cl - sx, ct - sy); 2390 } else { 2391 canvas.translate(cl, ct); 2392 if (scalingRequired) { 2393 // mAttachInfo cannot be null, otherwise scalingRequired == false 2394 final float scale = 1.0f / mAttachInfo.mApplicationScale; 2395 canvas.scale(scale, scale); 2396 } 2397 } 2398 2399 if (transformToApply != null || alpha < 1.0f || !child.hasIdentityMatrix()) { 2400 if (transformToApply != null || !childHasIdentityMatrix) { 2401 int transX = 0; 2402 int transY = 0; 2403 2404 if (cache == null && !hasDisplayList) { 2405 transX = -sx; 2406 transY = -sy; 2407 } 2408 2409 if (transformToApply != null) { 2410 if (concatMatrix) { 2411 // Undo the scroll translation, apply the transformation matrix, 2412 // then redo the scroll translate to get the correct result. 2413 canvas.translate(-transX, -transY); 2414 canvas.concat(transformToApply.getMatrix()); 2415 canvas.translate(transX, transY); 2416 mGroupFlags |= FLAG_CLEAR_TRANSFORMATION; 2417 } 2418 2419 float transformAlpha = transformToApply.getAlpha(); 2420 if (transformAlpha < 1.0f) { 2421 alpha *= transformToApply.getAlpha(); 2422 mGroupFlags |= FLAG_CLEAR_TRANSFORMATION; 2423 } 2424 } 2425 2426 if (!childHasIdentityMatrix) { 2427 canvas.translate(-transX, -transY); 2428 canvas.concat(child.getMatrix()); 2429 canvas.translate(transX, transY); 2430 } 2431 } 2432 2433 if (alpha < 1.0f) { 2434 mGroupFlags |= FLAG_CLEAR_TRANSFORMATION; 2435 if (hasNoCache) { 2436 final int multipliedAlpha = (int) (255 * alpha); 2437 if (!child.onSetAlpha(multipliedAlpha)) { 2438 int layerFlags = Canvas.HAS_ALPHA_LAYER_SAVE_FLAG; 2439 if ((flags & FLAG_CLIP_CHILDREN) == FLAG_CLIP_CHILDREN || 2440 layerType != LAYER_TYPE_NONE) { 2441 layerFlags |= Canvas.CLIP_TO_LAYER_SAVE_FLAG; 2442 } 2443 if (layerType != LAYER_TYPE_NONE) { 2444 child.mLayerPaint.setAlpha(multipliedAlpha); 2445 } else { 2446 canvas.saveLayerAlpha(sx, sy, sx + cr - cl, sy + cb - ct, 2447 multipliedAlpha, layerFlags); 2448 } 2449 } else { 2450 // Alpha is handled by the child directly, clobber the layer's alpha 2451 if (layerType != LAYER_TYPE_NONE) { 2452 child.mLayerPaint.setAlpha(255); 2453 } 2454 child.mPrivateFlags |= ALPHA_SET; 2455 } 2456 } 2457 } 2458 } else if ((child.mPrivateFlags & ALPHA_SET) == ALPHA_SET) { 2459 child.onSetAlpha(255); 2460 child.mPrivateFlags &= ~ALPHA_SET; 2461 } 2462 2463 if ((flags & FLAG_CLIP_CHILDREN) == FLAG_CLIP_CHILDREN) { 2464 if (cache == null && !hasDisplayList) { 2465 canvas.clipRect(sx, sy, sx + (cr - cl), sy + (cb - ct)); 2466 } else { 2467 if (!scalingRequired || cache == null) { 2468 canvas.clipRect(0, 0, cr - cl, cb - ct); 2469 } else { 2470 canvas.clipRect(0, 0, cache.getWidth(), cache.getHeight()); 2471 } 2472 } 2473 } 2474 2475 if (hasNoCache) { 2476 boolean layerRendered = false; 2477 if (layerType == LAYER_TYPE_HARDWARE) { 2478 final HardwareLayer layer = child.getHardwareLayer(); 2479 if (layer != null && layer.isValid()) { 2480 ((HardwareCanvas) canvas).drawHardwareLayer(layer, 0, 0, child.mLayerPaint); 2481 layerRendered = true; 2482 } else { 2483 canvas.saveLayer(sx, sy, sx + cr - cl, sy + cb - ct, child.mLayerPaint, 2484 Canvas.HAS_ALPHA_LAYER_SAVE_FLAG | Canvas.CLIP_TO_LAYER_SAVE_FLAG); 2485 } 2486 } 2487 2488 if (!layerRendered) { 2489 if (!hasDisplayList) { 2490 // Fast path for layouts with no backgrounds 2491 if ((child.mPrivateFlags & SKIP_DRAW) == SKIP_DRAW) { 2492 if (ViewDebug.TRACE_HIERARCHY) { 2493 ViewDebug.trace(this, ViewDebug.HierarchyTraceType.DRAW); 2494 } 2495 child.mPrivateFlags &= ~DIRTY_MASK; 2496 child.dispatchDraw(canvas); 2497 } else { 2498 child.draw(canvas); 2499 } 2500 } else { 2501 child.mPrivateFlags &= ~DIRTY_MASK; 2502 // Skip drawing the display list into ours if we were just refreshing 2503 // it's content; we already have a reference to it in our display list 2504 if (mRecreateDisplayList || mLayerType != LAYER_TYPE_NONE) { 2505 ((HardwareCanvas) canvas).drawDisplayList(displayList); 2506 } 2507 } 2508 } 2509 } else if (cache != null) { 2510 child.mPrivateFlags &= ~DIRTY_MASK; 2511 Paint cachePaint; 2512 2513 if (layerType == LAYER_TYPE_NONE) { 2514 cachePaint = mCachePaint; 2515 if (alpha < 1.0f) { 2516 cachePaint.setAlpha((int) (alpha * 255)); 2517 mGroupFlags |= FLAG_ALPHA_LOWER_THAN_ONE; 2518 } else if ((flags & FLAG_ALPHA_LOWER_THAN_ONE) == FLAG_ALPHA_LOWER_THAN_ONE) { 2519 cachePaint.setAlpha(255); 2520 mGroupFlags &= ~FLAG_ALPHA_LOWER_THAN_ONE; 2521 } 2522 } else { 2523 cachePaint = child.mLayerPaint; 2524 cachePaint.setAlpha((int) (alpha * 255)); 2525 } 2526 canvas.drawBitmap(cache, 0.0f, 0.0f, cachePaint); 2527 } 2528 2529 canvas.restoreToCount(restoreTo); 2530 2531 if (a != null && !more) { 2532 child.onSetAlpha(255); 2533 finishAnimatingView(child, a); 2534 } 2535 2536 if (more && canvas.isHardwareAccelerated()) { 2537 // invalidation is the trigger to recreate display lists, so if we're using 2538 // display lists to render, force an invalidate to allow the animation to 2539 // continue drawing another frame 2540 invalidate(); 2541 } 2542 2543 child.mRecreateDisplayList = false; 2544 2545 return more; 2546 } 2547 2548 /** 2549 * By default, children are clipped to their bounds before drawing. This 2550 * allows view groups to override this behavior for animations, etc. 2551 * 2552 * @param clipChildren true to clip children to their bounds, 2553 * false otherwise 2554 * @attr ref android.R.styleable#ViewGroup_clipChildren 2555 */ 2556 public void setClipChildren(boolean clipChildren) { 2557 setBooleanFlag(FLAG_CLIP_CHILDREN, clipChildren); 2558 } 2559 2560 /** 2561 * By default, children are clipped to the padding of the ViewGroup. This 2562 * allows view groups to override this behavior 2563 * 2564 * @param clipToPadding true to clip children to the padding of the 2565 * group, false otherwise 2566 * @attr ref android.R.styleable#ViewGroup_clipToPadding 2567 */ 2568 public void setClipToPadding(boolean clipToPadding) { 2569 setBooleanFlag(FLAG_CLIP_TO_PADDING, clipToPadding); 2570 } 2571 2572 /** 2573 * {@inheritDoc} 2574 */ 2575 @Override 2576 public void dispatchSetSelected(boolean selected) { 2577 final View[] children = mChildren; 2578 final int count = mChildrenCount; 2579 for (int i = 0; i < count; i++) { 2580 2581 children[i].setSelected(selected); 2582 } 2583 } 2584 2585 /** 2586 * {@inheritDoc} 2587 */ 2588 @Override 2589 public void dispatchSetActivated(boolean activated) { 2590 final View[] children = mChildren; 2591 final int count = mChildrenCount; 2592 for (int i = 0; i < count; i++) { 2593 2594 children[i].setActivated(activated); 2595 } 2596 } 2597 2598 @Override 2599 protected void dispatchSetPressed(boolean pressed) { 2600 final View[] children = mChildren; 2601 final int count = mChildrenCount; 2602 for (int i = 0; i < count; i++) { 2603 children[i].setPressed(pressed); 2604 } 2605 } 2606 2607 /** 2608 * When this property is set to true, this ViewGroup supports static transformations on 2609 * children; this causes 2610 * {@link #getChildStaticTransformation(View, android.view.animation.Transformation)} to be 2611 * invoked when a child is drawn. 2612 * 2613 * Any subclass overriding 2614 * {@link #getChildStaticTransformation(View, android.view.animation.Transformation)} should 2615 * set this property to true. 2616 * 2617 * @param enabled True to enable static transformations on children, false otherwise. 2618 * 2619 * @see #FLAG_SUPPORT_STATIC_TRANSFORMATIONS 2620 */ 2621 protected void setStaticTransformationsEnabled(boolean enabled) { 2622 setBooleanFlag(FLAG_SUPPORT_STATIC_TRANSFORMATIONS, enabled); 2623 } 2624 2625 /** 2626 * {@inheritDoc} 2627 * 2628 * @see #setStaticTransformationsEnabled(boolean) 2629 */ 2630 protected boolean getChildStaticTransformation(View child, Transformation t) { 2631 return false; 2632 } 2633 2634 /** 2635 * {@hide} 2636 */ 2637 @Override 2638 protected View findViewTraversal(int id) { 2639 if (id == mID) { 2640 return this; 2641 } 2642 2643 final View[] where = mChildren; 2644 final int len = mChildrenCount; 2645 2646 for (int i = 0; i < len; i++) { 2647 View v = where[i]; 2648 2649 if ((v.mPrivateFlags & IS_ROOT_NAMESPACE) == 0) { 2650 v = v.findViewById(id); 2651 2652 if (v != null) { 2653 return v; 2654 } 2655 } 2656 } 2657 2658 return null; 2659 } 2660 2661 /** 2662 * {@hide} 2663 */ 2664 @Override 2665 protected View findViewWithTagTraversal(Object tag) { 2666 if (tag != null && tag.equals(mTag)) { 2667 return this; 2668 } 2669 2670 final View[] where = mChildren; 2671 final int len = mChildrenCount; 2672 2673 for (int i = 0; i < len; i++) { 2674 View v = where[i]; 2675 2676 if ((v.mPrivateFlags & IS_ROOT_NAMESPACE) == 0) { 2677 v = v.findViewWithTag(tag); 2678 2679 if (v != null) { 2680 return v; 2681 } 2682 } 2683 } 2684 2685 return null; 2686 } 2687 2688 /** 2689 * {@hide} 2690 */ 2691 @Override 2692 protected View findViewByPredicateTraversal(Predicate<View> predicate) { 2693 if (predicate.apply(this)) { 2694 return this; 2695 } 2696 2697 final View[] where = mChildren; 2698 final int len = mChildrenCount; 2699 2700 for (int i = 0; i < len; i++) { 2701 View v = where[i]; 2702 2703 if ((v.mPrivateFlags & IS_ROOT_NAMESPACE) == 0) { 2704 v = v.findViewByPredicate(predicate); 2705 2706 if (v != null) { 2707 return v; 2708 } 2709 } 2710 } 2711 2712 return null; 2713 } 2714 2715 /** 2716 * Adds a child view. If no layout parameters are already set on the child, the 2717 * default parameters for this ViewGroup are set on the child. 2718 * 2719 * @param child the child view to add 2720 * 2721 * @see #generateDefaultLayoutParams() 2722 */ 2723 public void addView(View child) { 2724 addView(child, -1); 2725 } 2726 2727 /** 2728 * Adds a child view. If no layout parameters are already set on the child, the 2729 * default parameters for this ViewGroup are set on the child. 2730 * 2731 * @param child the child view to add 2732 * @param index the position at which to add the child 2733 * 2734 * @see #generateDefaultLayoutParams() 2735 */ 2736 public void addView(View child, int index) { 2737 LayoutParams params = child.getLayoutParams(); 2738 if (params == null) { 2739 params = generateDefaultLayoutParams(); 2740 if (params == null) { 2741 throw new IllegalArgumentException("generateDefaultLayoutParams() cannot return null"); 2742 } 2743 } 2744 addView(child, index, params); 2745 } 2746 2747 /** 2748 * Adds a child view with this ViewGroup's default layout parameters and the 2749 * specified width and height. 2750 * 2751 * @param child the child view to add 2752 */ 2753 public void addView(View child, int width, int height) { 2754 final LayoutParams params = generateDefaultLayoutParams(); 2755 params.width = width; 2756 params.height = height; 2757 addView(child, -1, params); 2758 } 2759 2760 /** 2761 * Adds a child view with the specified layout parameters. 2762 * 2763 * @param child the child view to add 2764 * @param params the layout parameters to set on the child 2765 */ 2766 public void addView(View child, LayoutParams params) { 2767 addView(child, -1, params); 2768 } 2769 2770 /** 2771 * Adds a child view with the specified layout parameters. 2772 * 2773 * @param child the child view to add 2774 * @param index the position at which to add the child 2775 * @param params the layout parameters to set on the child 2776 */ 2777 public void addView(View child, int index, LayoutParams params) { 2778 if (DBG) { 2779 System.out.println(this + " addView"); 2780 } 2781 2782 // addViewInner() will call child.requestLayout() when setting the new LayoutParams 2783 // therefore, we call requestLayout() on ourselves before, so that the child's request 2784 // will be blocked at our level 2785 requestLayout(); 2786 invalidate(); 2787 addViewInner(child, index, params, false); 2788 } 2789 2790 /** 2791 * {@inheritDoc} 2792 */ 2793 public void updateViewLayout(View view, ViewGroup.LayoutParams params) { 2794 if (!checkLayoutParams(params)) { 2795 throw new IllegalArgumentException("Invalid LayoutParams supplied to " + this); 2796 } 2797 if (view.mParent != this) { 2798 throw new IllegalArgumentException("Given view not a child of " + this); 2799 } 2800 view.setLayoutParams(params); 2801 } 2802 2803 /** 2804 * {@inheritDoc} 2805 */ 2806 protected boolean checkLayoutParams(ViewGroup.LayoutParams p) { 2807 return p != null; 2808 } 2809 2810 /** 2811 * Interface definition for a callback to be invoked when the hierarchy 2812 * within this view changed. The hierarchy changes whenever a child is added 2813 * to or removed from this view. 2814 */ 2815 public interface OnHierarchyChangeListener { 2816 /** 2817 * Called when a new child is added to a parent view. 2818 * 2819 * @param parent the view in which a child was added 2820 * @param child the new child view added in the hierarchy 2821 */ 2822 void onChildViewAdded(View parent, View child); 2823 2824 /** 2825 * Called when a child is removed from a parent view. 2826 * 2827 * @param parent the view from which the child was removed 2828 * @param child the child removed from the hierarchy 2829 */ 2830 void onChildViewRemoved(View parent, View child); 2831 } 2832 2833 /** 2834 * Register a callback to be invoked when a child is added to or removed 2835 * from this view. 2836 * 2837 * @param listener the callback to invoke on hierarchy change 2838 */ 2839 public void setOnHierarchyChangeListener(OnHierarchyChangeListener listener) { 2840 mOnHierarchyChangeListener = listener; 2841 } 2842 2843 /** 2844 * Adds a view during layout. This is useful if in your onLayout() method, 2845 * you need to add more views (as does the list view for example). 2846 * 2847 * If index is negative, it means put it at the end of the list. 2848 * 2849 * @param child the view to add to the group 2850 * @param index the index at which the child must be added 2851 * @param params the layout parameters to associate with the child 2852 * @return true if the child was added, false otherwise 2853 */ 2854 protected boolean addViewInLayout(View child, int index, LayoutParams params) { 2855 return addViewInLayout(child, index, params, false); 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 * @param preventRequestLayout if true, calling this method will not trigger a 2868 * layout request on child 2869 * @return true if the child was added, false otherwise 2870 */ 2871 protected boolean addViewInLayout(View child, int index, LayoutParams params, 2872 boolean preventRequestLayout) { 2873 child.mParent = null; 2874 addViewInner(child, index, params, preventRequestLayout); 2875 child.mPrivateFlags = (child.mPrivateFlags & ~DIRTY_MASK) | DRAWN; 2876 return true; 2877 } 2878 2879 /** 2880 * Prevents the specified child to be laid out during the next layout pass. 2881 * 2882 * @param child the child on which to perform the cleanup 2883 */ 2884 protected void cleanupLayoutState(View child) { 2885 child.mPrivateFlags &= ~View.FORCE_LAYOUT; 2886 } 2887 2888 private void addViewInner(View child, int index, LayoutParams params, 2889 boolean preventRequestLayout) { 2890 2891 if (child.getParent() != null) { 2892 throw new IllegalStateException("The specified child already has a parent. " + 2893 "You must call removeView() on the child's parent first."); 2894 } 2895 2896 if (mTransition != null) { 2897 mTransition.addChild(this, child); 2898 } 2899 2900 if (!checkLayoutParams(params)) { 2901 params = generateLayoutParams(params); 2902 } 2903 2904 if (preventRequestLayout) { 2905 child.mLayoutParams = params; 2906 } else { 2907 child.setLayoutParams(params); 2908 } 2909 2910 if (index < 0) { 2911 index = mChildrenCount; 2912 } 2913 2914 addInArray(child, index); 2915 2916 // tell our children 2917 if (preventRequestLayout) { 2918 child.assignParent(this); 2919 } else { 2920 child.mParent = this; 2921 } 2922 2923 if (child.hasFocus()) { 2924 requestChildFocus(child, child.findFocus()); 2925 } 2926 2927 AttachInfo ai = mAttachInfo; 2928 if (ai != null) { 2929 boolean lastKeepOn = ai.mKeepScreenOn; 2930 ai.mKeepScreenOn = false; 2931 child.dispatchAttachedToWindow(mAttachInfo, (mViewFlags&VISIBILITY_MASK)); 2932 if (ai.mKeepScreenOn) { 2933 needGlobalAttributesUpdate(true); 2934 } 2935 ai.mKeepScreenOn = lastKeepOn; 2936 } 2937 2938 if (mOnHierarchyChangeListener != null) { 2939 mOnHierarchyChangeListener.onChildViewAdded(this, child); 2940 } 2941 2942 if ((child.mViewFlags & DUPLICATE_PARENT_STATE) == DUPLICATE_PARENT_STATE) { 2943 mGroupFlags |= FLAG_NOTIFY_CHILDREN_ON_DRAWABLE_STATE_CHANGE; 2944 } 2945 } 2946 2947 private void addInArray(View child, int index) { 2948 View[] children = mChildren; 2949 final int count = mChildrenCount; 2950 final int size = children.length; 2951 if (index == count) { 2952 if (size == count) { 2953 mChildren = new View[size + ARRAY_CAPACITY_INCREMENT]; 2954 System.arraycopy(children, 0, mChildren, 0, size); 2955 children = mChildren; 2956 } 2957 children[mChildrenCount++] = child; 2958 } else if (index < count) { 2959 if (size == count) { 2960 mChildren = new View[size + ARRAY_CAPACITY_INCREMENT]; 2961 System.arraycopy(children, 0, mChildren, 0, index); 2962 System.arraycopy(children, index, mChildren, index + 1, count - index); 2963 children = mChildren; 2964 } else { 2965 System.arraycopy(children, index, children, index + 1, count - index); 2966 } 2967 children[index] = child; 2968 mChildrenCount++; 2969 if (mLastTouchDownIndex >= index) { 2970 mLastTouchDownIndex++; 2971 } 2972 } else { 2973 throw new IndexOutOfBoundsException("index=" + index + " count=" + count); 2974 } 2975 } 2976 2977 // This method also sets the child's mParent to null 2978 private void removeFromArray(int index) { 2979 final View[] children = mChildren; 2980 if (!(mTransitioningViews != null && mTransitioningViews.contains(children[index]))) { 2981 children[index].mParent = null; 2982 } 2983 final int count = mChildrenCount; 2984 if (index == count - 1) { 2985 children[--mChildrenCount] = null; 2986 } else if (index >= 0 && index < count) { 2987 System.arraycopy(children, index + 1, children, index, count - index - 1); 2988 children[--mChildrenCount] = null; 2989 } else { 2990 throw new IndexOutOfBoundsException(); 2991 } 2992 if (mLastTouchDownIndex == index) { 2993 mLastTouchDownTime = 0; 2994 mLastTouchDownIndex = -1; 2995 } else if (mLastTouchDownIndex > index) { 2996 mLastTouchDownIndex--; 2997 } 2998 } 2999 3000 // This method also sets the children's mParent to null 3001 private void removeFromArray(int start, int count) { 3002 final View[] children = mChildren; 3003 final int childrenCount = mChildrenCount; 3004 3005 start = Math.max(0, start); 3006 final int end = Math.min(childrenCount, start + count); 3007 3008 if (start == end) { 3009 return; 3010 } 3011 3012 if (end == childrenCount) { 3013 for (int i = start; i < end; i++) { 3014 children[i].mParent = null; 3015 children[i] = null; 3016 } 3017 } else { 3018 for (int i = start; i < end; i++) { 3019 children[i].mParent = null; 3020 } 3021 3022 // Since we're looping above, we might as well do the copy, but is arraycopy() 3023 // faster than the extra 2 bounds checks we would do in the loop? 3024 System.arraycopy(children, end, children, start, childrenCount - end); 3025 3026 for (int i = childrenCount - (end - start); i < childrenCount; i++) { 3027 children[i] = null; 3028 } 3029 } 3030 3031 mChildrenCount -= (end - start); 3032 } 3033 3034 private void bindLayoutAnimation(View child) { 3035 Animation a = mLayoutAnimationController.getAnimationForView(child); 3036 child.setAnimation(a); 3037 } 3038 3039 /** 3040 * Subclasses should override this method to set layout animation 3041 * parameters on the supplied child. 3042 * 3043 * @param child the child to associate with animation parameters 3044 * @param params the child's layout parameters which hold the animation 3045 * parameters 3046 * @param index the index of the child in the view group 3047 * @param count the number of children in the view group 3048 */ 3049 protected void attachLayoutAnimationParameters(View child, 3050 LayoutParams params, int index, int count) { 3051 LayoutAnimationController.AnimationParameters animationParams = 3052 params.layoutAnimationParameters; 3053 if (animationParams == null) { 3054 animationParams = new LayoutAnimationController.AnimationParameters(); 3055 params.layoutAnimationParameters = animationParams; 3056 } 3057 3058 animationParams.count = count; 3059 animationParams.index = index; 3060 } 3061 3062 /** 3063 * {@inheritDoc} 3064 */ 3065 public void removeView(View view) { 3066 removeViewInternal(view); 3067 requestLayout(); 3068 invalidate(); 3069 } 3070 3071 /** 3072 * Removes a view during layout. This is useful if in your onLayout() method, 3073 * you need to remove more views. 3074 * 3075 * @param view the view to remove from the group 3076 */ 3077 public void removeViewInLayout(View view) { 3078 removeViewInternal(view); 3079 } 3080 3081 /** 3082 * Removes a range of views during layout. This is useful if in your onLayout() method, 3083 * you need to remove more views. 3084 * 3085 * @param start the index of the first view to remove from the group 3086 * @param count the number of views to remove from the group 3087 */ 3088 public void removeViewsInLayout(int start, int count) { 3089 removeViewsInternal(start, count); 3090 } 3091 3092 /** 3093 * Removes the view at the specified position in the group. 3094 * 3095 * @param index the position in the group of the view to remove 3096 */ 3097 public void removeViewAt(int index) { 3098 removeViewInternal(index, getChildAt(index)); 3099 requestLayout(); 3100 invalidate(); 3101 } 3102 3103 /** 3104 * Removes the specified range of views from the group. 3105 * 3106 * @param start the first position in the group of the range of views to remove 3107 * @param count the number of views to remove 3108 */ 3109 public void removeViews(int start, int count) { 3110 removeViewsInternal(start, count); 3111 requestLayout(); 3112 invalidate(); 3113 } 3114 3115 private void removeViewInternal(View view) { 3116 final int index = indexOfChild(view); 3117 if (index >= 0) { 3118 removeViewInternal(index, view); 3119 } 3120 } 3121 3122 private void removeViewInternal(int index, View view) { 3123 3124 if (mTransition != null) { 3125 mTransition.removeChild(this, view); 3126 } 3127 3128 boolean clearChildFocus = false; 3129 if (view == mFocused) { 3130 view.clearFocusForRemoval(); 3131 clearChildFocus = true; 3132 } 3133 3134 if (view.getAnimation() != null || 3135 (mTransitioningViews != null && mTransitioningViews.contains(view))) { 3136 addDisappearingView(view); 3137 } else if (view.mAttachInfo != null) { 3138 view.dispatchDetachedFromWindow(); 3139 } 3140 3141 if (mOnHierarchyChangeListener != null) { 3142 mOnHierarchyChangeListener.onChildViewRemoved(this, view); 3143 } 3144 3145 needGlobalAttributesUpdate(false); 3146 3147 removeFromArray(index); 3148 3149 if (clearChildFocus) { 3150 clearChildFocus(view); 3151 } 3152 } 3153 3154 /** 3155 * Sets the LayoutTransition object for this ViewGroup. If the LayoutTransition object is 3156 * not null, changes in layout which occur because of children being added to or removed from 3157 * the ViewGroup will be animated according to the animations defined in that LayoutTransition 3158 * object. By default, the transition object is null (so layout changes are not animated). 3159 * 3160 * @param transition The LayoutTransition object that will animated changes in layout. A value 3161 * of <code>null</code> means no transition will run on layout changes. 3162 * @attr ref android.R.styleable#ViewGroup_animateLayoutChanges 3163 */ 3164 public void setLayoutTransition(LayoutTransition transition) { 3165 if (mTransition != null) { 3166 mTransition.removeTransitionListener(mLayoutTransitionListener); 3167 } 3168 mTransition = transition; 3169 if (mTransition != null) { 3170 mTransition.addTransitionListener(mLayoutTransitionListener); 3171 } 3172 } 3173 3174 /** 3175 * Gets the LayoutTransition object for this ViewGroup. If the LayoutTransition object is 3176 * not null, changes in layout which occur because of children being added to or removed from 3177 * the ViewGroup will be animated according to the animations defined in that LayoutTransition 3178 * object. By default, the transition object is null (so layout changes are not animated). 3179 * 3180 * @return LayoutTranstion The LayoutTransition object that will animated changes in layout. 3181 * A value of <code>null</code> means no transition will run on layout changes. 3182 */ 3183 public LayoutTransition getLayoutTransition() { 3184 return mTransition; 3185 } 3186 3187 private void removeViewsInternal(int start, int count) { 3188 final OnHierarchyChangeListener onHierarchyChangeListener = mOnHierarchyChangeListener; 3189 final boolean notifyListener = onHierarchyChangeListener != null; 3190 final View focused = mFocused; 3191 final boolean detach = mAttachInfo != null; 3192 View clearChildFocus = null; 3193 3194 final View[] children = mChildren; 3195 final int end = start + count; 3196 3197 for (int i = start; i < end; i++) { 3198 final View view = children[i]; 3199 3200 if (mTransition != null) { 3201 mTransition.removeChild(this, view); 3202 } 3203 3204 if (view == focused) { 3205 view.clearFocusForRemoval(); 3206 clearChildFocus = view; 3207 } 3208 3209 if (view.getAnimation() != null || 3210 (mTransitioningViews != null && mTransitioningViews.contains(view))) { 3211 addDisappearingView(view); 3212 } else if (detach) { 3213 view.dispatchDetachedFromWindow(); 3214 } 3215 3216 needGlobalAttributesUpdate(false); 3217 3218 if (notifyListener) { 3219 onHierarchyChangeListener.onChildViewRemoved(this, view); 3220 } 3221 } 3222 3223 removeFromArray(start, count); 3224 3225 if (clearChildFocus != null) { 3226 clearChildFocus(clearChildFocus); 3227 } 3228 } 3229 3230 /** 3231 * Call this method to remove all child views from the 3232 * ViewGroup. 3233 */ 3234 public void removeAllViews() { 3235 removeAllViewsInLayout(); 3236 requestLayout(); 3237 invalidate(); 3238 } 3239 3240 /** 3241 * Called by a ViewGroup subclass to remove child views from itself, 3242 * when it must first know its size on screen before it can calculate how many 3243 * child views it will render. An example is a Gallery or a ListView, which 3244 * may "have" 50 children, but actually only render the number of children 3245 * that can currently fit inside the object on screen. Do not call 3246 * this method unless you are extending ViewGroup and understand the 3247 * view measuring and layout pipeline. 3248 */ 3249 public void removeAllViewsInLayout() { 3250 final int count = mChildrenCount; 3251 if (count <= 0) { 3252 return; 3253 } 3254 3255 final View[] children = mChildren; 3256 mChildrenCount = 0; 3257 3258 final OnHierarchyChangeListener listener = mOnHierarchyChangeListener; 3259 final boolean notify = listener != null; 3260 final View focused = mFocused; 3261 final boolean detach = mAttachInfo != null; 3262 View clearChildFocus = null; 3263 3264 needGlobalAttributesUpdate(false); 3265 3266 for (int i = count - 1; i >= 0; i--) { 3267 final View view = children[i]; 3268 3269 if (mTransition != null) { 3270 mTransition.removeChild(this, view); 3271 } 3272 3273 if (view == focused) { 3274 view.clearFocusForRemoval(); 3275 clearChildFocus = view; 3276 } 3277 3278 if (view.getAnimation() != null || 3279 (mTransitioningViews != null && mTransitioningViews.contains(view))) { 3280 addDisappearingView(view); 3281 } else if (detach) { 3282 view.dispatchDetachedFromWindow(); 3283 } 3284 3285 if (notify) { 3286 listener.onChildViewRemoved(this, view); 3287 } 3288 3289 view.mParent = null; 3290 children[i] = null; 3291 } 3292 3293 if (clearChildFocus != null) { 3294 clearChildFocus(clearChildFocus); 3295 } 3296 } 3297 3298 /** 3299 * Finishes the removal of a detached view. This method will dispatch the detached from 3300 * window event and notify the hierarchy change listener. 3301 * 3302 * @param child the child to be definitely removed from the view hierarchy 3303 * @param animate if true and the view has an animation, the view is placed in the 3304 * disappearing views list, otherwise, it is detached from the window 3305 * 3306 * @see #attachViewToParent(View, int, android.view.ViewGroup.LayoutParams) 3307 * @see #detachAllViewsFromParent() 3308 * @see #detachViewFromParent(View) 3309 * @see #detachViewFromParent(int) 3310 */ 3311 protected void removeDetachedView(View child, boolean animate) { 3312 if (mTransition != null) { 3313 mTransition.removeChild(this, child); 3314 } 3315 3316 if (child == mFocused) { 3317 child.clearFocus(); 3318 } 3319 3320 if ((animate && child.getAnimation() != null) || 3321 (mTransitioningViews != null && mTransitioningViews.contains(child))) { 3322 addDisappearingView(child); 3323 } else if (child.mAttachInfo != null) { 3324 child.dispatchDetachedFromWindow(); 3325 } 3326 3327 if (mOnHierarchyChangeListener != null) { 3328 mOnHierarchyChangeListener.onChildViewRemoved(this, child); 3329 } 3330 } 3331 3332 /** 3333 * Attaches a view to this view group. Attaching a view assigns this group as the parent, 3334 * sets the layout parameters and puts the view in the list of children so it can be retrieved 3335 * by calling {@link #getChildAt(int)}. 3336 * 3337 * This method should be called only for view which were detached from their parent. 3338 * 3339 * @param child the child to attach 3340 * @param index the index at which the child should be attached 3341 * @param params the layout parameters of the child 3342 * 3343 * @see #removeDetachedView(View, boolean) 3344 * @see #detachAllViewsFromParent() 3345 * @see #detachViewFromParent(View) 3346 * @see #detachViewFromParent(int) 3347 */ 3348 protected void attachViewToParent(View child, int index, LayoutParams params) { 3349 child.mLayoutParams = params; 3350 3351 if (index < 0) { 3352 index = mChildrenCount; 3353 } 3354 3355 addInArray(child, index); 3356 3357 child.mParent = this; 3358 child.mPrivateFlags = (child.mPrivateFlags & ~DIRTY_MASK & ~DRAWING_CACHE_VALID) | 3359 DRAWN | INVALIDATED; 3360 this.mPrivateFlags |= INVALIDATED; 3361 3362 if (child.hasFocus()) { 3363 requestChildFocus(child, child.findFocus()); 3364 } 3365 } 3366 3367 /** 3368 * Detaches a view from its parent. Detaching a view should be temporary and followed 3369 * either by a call to {@link #attachViewToParent(View, int, android.view.ViewGroup.LayoutParams)} 3370 * or a call to {@link #removeDetachedView(View, boolean)}. When a view is detached, 3371 * its parent is null and cannot be retrieved by a call to {@link #getChildAt(int)}. 3372 * 3373 * @param child the child to detach 3374 * 3375 * @see #detachViewFromParent(int) 3376 * @see #detachViewsFromParent(int, int) 3377 * @see #detachAllViewsFromParent() 3378 * @see #attachViewToParent(View, int, android.view.ViewGroup.LayoutParams) 3379 * @see #removeDetachedView(View, boolean) 3380 */ 3381 protected void detachViewFromParent(View child) { 3382 removeFromArray(indexOfChild(child)); 3383 } 3384 3385 /** 3386 * Detaches a view from its parent. Detaching a view should be temporary and followed 3387 * either by a call to {@link #attachViewToParent(View, int, android.view.ViewGroup.LayoutParams)} 3388 * or a call to {@link #removeDetachedView(View, boolean)}. When a view is detached, 3389 * its parent is null and cannot be retrieved by a call to {@link #getChildAt(int)}. 3390 * 3391 * @param index the index of the child to detach 3392 * 3393 * @see #detachViewFromParent(View) 3394 * @see #detachAllViewsFromParent() 3395 * @see #detachViewsFromParent(int, int) 3396 * @see #attachViewToParent(View, int, android.view.ViewGroup.LayoutParams) 3397 * @see #removeDetachedView(View, boolean) 3398 */ 3399 protected void detachViewFromParent(int index) { 3400 removeFromArray(index); 3401 } 3402 3403 /** 3404 * Detaches a range of view from their parent. Detaching a view should be temporary and followed 3405 * either by a call to {@link #attachViewToParent(View, int, android.view.ViewGroup.LayoutParams)} 3406 * or a call to {@link #removeDetachedView(View, boolean)}. When a view is detached, its 3407 * parent is null and cannot be retrieved by a call to {@link #getChildAt(int)}. 3408 * 3409 * @param start the first index of the childrend range to detach 3410 * @param count the number of children to detach 3411 * 3412 * @see #detachViewFromParent(View) 3413 * @see #detachViewFromParent(int) 3414 * @see #detachAllViewsFromParent() 3415 * @see #attachViewToParent(View, int, android.view.ViewGroup.LayoutParams) 3416 * @see #removeDetachedView(View, boolean) 3417 */ 3418 protected void detachViewsFromParent(int start, int count) { 3419 removeFromArray(start, count); 3420 } 3421 3422 /** 3423 * Detaches all views from the parent. Detaching a view should be temporary and followed 3424 * either by a call to {@link #attachViewToParent(View, int, android.view.ViewGroup.LayoutParams)} 3425 * or a call to {@link #removeDetachedView(View, boolean)}. When a view is detached, 3426 * its parent is null and cannot be retrieved by a call to {@link #getChildAt(int)}. 3427 * 3428 * @see #detachViewFromParent(View) 3429 * @see #detachViewFromParent(int) 3430 * @see #detachViewsFromParent(int, int) 3431 * @see #attachViewToParent(View, int, android.view.ViewGroup.LayoutParams) 3432 * @see #removeDetachedView(View, boolean) 3433 */ 3434 protected void detachAllViewsFromParent() { 3435 final int count = mChildrenCount; 3436 if (count <= 0) { 3437 return; 3438 } 3439 3440 final View[] children = mChildren; 3441 mChildrenCount = 0; 3442 3443 for (int i = count - 1; i >= 0; i--) { 3444 children[i].mParent = null; 3445 children[i] = null; 3446 } 3447 } 3448 3449 /** 3450 * Don't call or override this method. It is used for the implementation of 3451 * the view hierarchy. 3452 */ 3453 public final void invalidateChild(View child, final Rect dirty) { 3454 if (ViewDebug.TRACE_HIERARCHY) { 3455 ViewDebug.trace(this, ViewDebug.HierarchyTraceType.INVALIDATE_CHILD); 3456 } 3457 3458 ViewParent parent = this; 3459 3460 final AttachInfo attachInfo = mAttachInfo; 3461 if (attachInfo != null) { 3462 // If the child is drawing an animation, we want to copy this flag onto 3463 // ourselves and the parent to make sure the invalidate request goes 3464 // through 3465 final boolean drawAnimation = (child.mPrivateFlags & DRAW_ANIMATION) == DRAW_ANIMATION; 3466 3467 if (dirty == null) { 3468 if (child.mLayerType != LAYER_TYPE_NONE) { 3469 mPrivateFlags |= INVALIDATED; 3470 mPrivateFlags &= ~DRAWING_CACHE_VALID; 3471 } 3472 do { 3473 View view = null; 3474 if (parent instanceof View) { 3475 view = (View) parent; 3476 if (view.mLayerType != LAYER_TYPE_NONE && 3477 view.getParent() instanceof View) { 3478 final View grandParent = (View) view.getParent(); 3479 grandParent.mPrivateFlags |= INVALIDATED; 3480 grandParent.mPrivateFlags &= ~DRAWING_CACHE_VALID; 3481 } 3482 if ((view.mPrivateFlags & DIRTY_MASK) != 0) { 3483 // already marked dirty - we're done 3484 break; 3485 } 3486 } 3487 3488 if (drawAnimation) { 3489 if (view != null) { 3490 view.mPrivateFlags |= DRAW_ANIMATION; 3491 } else if (parent instanceof ViewRoot) { 3492 ((ViewRoot) parent).mIsAnimating = true; 3493 } 3494 } 3495 3496 if (parent instanceof ViewRoot) { 3497 ((ViewRoot) parent).invalidate(); 3498 parent = null; 3499 } else if (view != null) { 3500 if ((mPrivateFlags & DRAWN) == DRAWN) { 3501 view.mPrivateFlags &= ~DRAWING_CACHE_VALID; 3502 view.mPrivateFlags |= DIRTY; 3503 parent = view.mParent; 3504 } else { 3505 parent = null; 3506 } 3507 } 3508 } while (parent != null); 3509 } else { 3510 // Check whether the child that requests the invalidate is fully opaque 3511 final boolean isOpaque = child.isOpaque() && !drawAnimation && 3512 child.getAnimation() == null; 3513 // Mark the child as dirty, using the appropriate flag 3514 // Make sure we do not set both flags at the same time 3515 int opaqueFlag = isOpaque ? DIRTY_OPAQUE : DIRTY; 3516 3517 final int[] location = attachInfo.mInvalidateChildLocation; 3518 location[CHILD_LEFT_INDEX] = child.mLeft; 3519 location[CHILD_TOP_INDEX] = child.mTop; 3520 Matrix childMatrix = child.getMatrix(); 3521 if (!childMatrix.isIdentity()) { 3522 RectF boundingRect = attachInfo.mTmpTransformRect; 3523 boundingRect.set(dirty); 3524 childMatrix.mapRect(boundingRect); 3525 dirty.set((int) boundingRect.left, (int) boundingRect.top, 3526 (int) (boundingRect.right + 0.5f), 3527 (int) (boundingRect.bottom + 0.5f)); 3528 } 3529 3530 if (child.mLayerType != LAYER_TYPE_NONE) { 3531 mPrivateFlags |= INVALIDATED; 3532 mPrivateFlags &= ~DRAWING_CACHE_VALID; 3533 } 3534 do { 3535 View view = null; 3536 if (parent instanceof View) { 3537 view = (View) parent; 3538 if (view.mLayerType != LAYER_TYPE_NONE && 3539 view.getParent() instanceof View) { 3540 final View grandParent = (View) view.getParent(); 3541 grandParent.mPrivateFlags |= INVALIDATED; 3542 grandParent.mPrivateFlags &= ~DRAWING_CACHE_VALID; 3543 } 3544 } 3545 3546 if (drawAnimation) { 3547 if (view != null) { 3548 view.mPrivateFlags |= DRAW_ANIMATION; 3549 } else if (parent instanceof ViewRoot) { 3550 ((ViewRoot) parent).mIsAnimating = true; 3551 } 3552 } 3553 3554 // If the parent is dirty opaque or not dirty, mark it dirty with the opaque 3555 // flag coming from the child that initiated the invalidate 3556 if (view != null) { 3557 if ((view.mViewFlags & FADING_EDGE_MASK) != 0 && 3558 view.getSolidColor() == 0 && !view.isOpaque()) { 3559 opaqueFlag = DIRTY; 3560 } 3561 if ((view.mPrivateFlags & DIRTY_MASK) != DIRTY) { 3562 view.mPrivateFlags = (view.mPrivateFlags & ~DIRTY_MASK) | opaqueFlag; 3563 } 3564 } 3565 3566 parent = parent.invalidateChildInParent(location, dirty); 3567 if (view != null) { 3568 // Account for transform on current parent 3569 Matrix m = view.getMatrix(); 3570 if (!m.isIdentity()) { 3571 RectF boundingRect = attachInfo.mTmpTransformRect; 3572 boundingRect.set(dirty); 3573 m.mapRect(boundingRect); 3574 dirty.set((int) boundingRect.left, (int) boundingRect.top, 3575 (int) (boundingRect.right + 0.5f), 3576 (int) (boundingRect.bottom + 0.5f)); 3577 } 3578 } 3579 } while (parent != null); 3580 } 3581 } 3582 } 3583 3584 /** 3585 * Don't call or override this method. It is used for the implementation of 3586 * the view hierarchy. 3587 * 3588 * This implementation returns null if this ViewGroup does not have a parent, 3589 * if this ViewGroup is already fully invalidated or if the dirty rectangle 3590 * does not intersect with this ViewGroup's bounds. 3591 */ 3592 public ViewParent invalidateChildInParent(final int[] location, final Rect dirty) { 3593 if (ViewDebug.TRACE_HIERARCHY) { 3594 ViewDebug.trace(this, ViewDebug.HierarchyTraceType.INVALIDATE_CHILD_IN_PARENT); 3595 } 3596 3597 if ((mPrivateFlags & DRAWN) == DRAWN) { 3598 if ((mGroupFlags & (FLAG_OPTIMIZE_INVALIDATE | FLAG_ANIMATION_DONE)) != 3599 FLAG_OPTIMIZE_INVALIDATE) { 3600 dirty.offset(location[CHILD_LEFT_INDEX] - mScrollX, 3601 location[CHILD_TOP_INDEX] - mScrollY); 3602 3603 final int left = mLeft; 3604 final int top = mTop; 3605 3606 if (dirty.intersect(0, 0, mRight - left, mBottom - top) || 3607 (mPrivateFlags & DRAW_ANIMATION) == DRAW_ANIMATION) { 3608 mPrivateFlags &= ~DRAWING_CACHE_VALID; 3609 3610 location[CHILD_LEFT_INDEX] = left; 3611 location[CHILD_TOP_INDEX] = top; 3612 3613 return mParent; 3614 } 3615 } else { 3616 mPrivateFlags &= ~DRAWN & ~DRAWING_CACHE_VALID; 3617 3618 location[CHILD_LEFT_INDEX] = mLeft; 3619 location[CHILD_TOP_INDEX] = mTop; 3620 3621 dirty.set(0, 0, mRight - location[CHILD_LEFT_INDEX], 3622 mBottom - location[CHILD_TOP_INDEX]); 3623 3624 return mParent; 3625 } 3626 } 3627 3628 return null; 3629 } 3630 3631 /** 3632 * Offset a rectangle that is in a descendant's coordinate 3633 * space into our coordinate space. 3634 * @param descendant A descendant of this view 3635 * @param rect A rectangle defined in descendant's coordinate space. 3636 */ 3637 public final void offsetDescendantRectToMyCoords(View descendant, Rect rect) { 3638 offsetRectBetweenParentAndChild(descendant, rect, true, false); 3639 } 3640 3641 /** 3642 * Offset a rectangle that is in our coordinate space into an ancestor's 3643 * coordinate space. 3644 * @param descendant A descendant of this view 3645 * @param rect A rectangle defined in descendant's coordinate space. 3646 */ 3647 public final void offsetRectIntoDescendantCoords(View descendant, Rect rect) { 3648 offsetRectBetweenParentAndChild(descendant, rect, false, false); 3649 } 3650 3651 /** 3652 * Helper method that offsets a rect either from parent to descendant or 3653 * descendant to parent. 3654 */ 3655 void offsetRectBetweenParentAndChild(View descendant, Rect rect, 3656 boolean offsetFromChildToParent, boolean clipToBounds) { 3657 3658 // already in the same coord system :) 3659 if (descendant == this) { 3660 return; 3661 } 3662 3663 ViewParent theParent = descendant.mParent; 3664 3665 // search and offset up to the parent 3666 while ((theParent != null) 3667 && (theParent instanceof View) 3668 && (theParent != this)) { 3669 3670 if (offsetFromChildToParent) { 3671 rect.offset(descendant.mLeft - descendant.mScrollX, 3672 descendant.mTop - descendant.mScrollY); 3673 if (clipToBounds) { 3674 View p = (View) theParent; 3675 rect.intersect(0, 0, p.mRight - p.mLeft, p.mBottom - p.mTop); 3676 } 3677 } else { 3678 if (clipToBounds) { 3679 View p = (View) theParent; 3680 rect.intersect(0, 0, p.mRight - p.mLeft, p.mBottom - p.mTop); 3681 } 3682 rect.offset(descendant.mScrollX - descendant.mLeft, 3683 descendant.mScrollY - descendant.mTop); 3684 } 3685 3686 descendant = (View) theParent; 3687 theParent = descendant.mParent; 3688 } 3689 3690 // now that we are up to this view, need to offset one more time 3691 // to get into our coordinate space 3692 if (theParent == this) { 3693 if (offsetFromChildToParent) { 3694 rect.offset(descendant.mLeft - descendant.mScrollX, 3695 descendant.mTop - descendant.mScrollY); 3696 } else { 3697 rect.offset(descendant.mScrollX - descendant.mLeft, 3698 descendant.mScrollY - descendant.mTop); 3699 } 3700 } else { 3701 throw new IllegalArgumentException("parameter must be a descendant of this view"); 3702 } 3703 } 3704 3705 /** 3706 * Offset the vertical location of all children of this view by the specified number of pixels. 3707 * 3708 * @param offset the number of pixels to offset 3709 * 3710 * @hide 3711 */ 3712 public void offsetChildrenTopAndBottom(int offset) { 3713 final int count = mChildrenCount; 3714 final View[] children = mChildren; 3715 3716 for (int i = 0; i < count; i++) { 3717 final View v = children[i]; 3718 v.mTop += offset; 3719 v.mBottom += offset; 3720 } 3721 } 3722 3723 /** 3724 * {@inheritDoc} 3725 */ 3726 public boolean getChildVisibleRect(View child, Rect r, android.graphics.Point offset) { 3727 int dx = child.mLeft - mScrollX; 3728 int dy = child.mTop - mScrollY; 3729 if (offset != null) { 3730 offset.x += dx; 3731 offset.y += dy; 3732 } 3733 r.offset(dx, dy); 3734 return r.intersect(0, 0, mRight - mLeft, mBottom - mTop) && 3735 (mParent == null || mParent.getChildVisibleRect(this, r, offset)); 3736 } 3737 3738 /** 3739 * {@inheritDoc} 3740 */ 3741 @Override 3742 public final void layout(int l, int t, int r, int b) { 3743 if (mTransition == null || !mTransition.isChangingLayout()) { 3744 super.layout(l, t, r, b); 3745 } else { 3746 // record the fact that we noop'd it; request layout when transition finishes 3747 mLayoutSuppressed = true; 3748 } 3749 } 3750 3751 /** 3752 * {@inheritDoc} 3753 */ 3754 @Override 3755 protected abstract void onLayout(boolean changed, 3756 int l, int t, int r, int b); 3757 3758 /** 3759 * Indicates whether the view group has the ability to animate its children 3760 * after the first layout. 3761 * 3762 * @return true if the children can be animated, false otherwise 3763 */ 3764 protected boolean canAnimate() { 3765 return mLayoutAnimationController != null; 3766 } 3767 3768 /** 3769 * Runs the layout animation. Calling this method triggers a relayout of 3770 * this view group. 3771 */ 3772 public void startLayoutAnimation() { 3773 if (mLayoutAnimationController != null) { 3774 mGroupFlags |= FLAG_RUN_ANIMATION; 3775 requestLayout(); 3776 } 3777 } 3778 3779 /** 3780 * Schedules the layout animation to be played after the next layout pass 3781 * of this view group. This can be used to restart the layout animation 3782 * when the content of the view group changes or when the activity is 3783 * paused and resumed. 3784 */ 3785 public void scheduleLayoutAnimation() { 3786 mGroupFlags |= FLAG_RUN_ANIMATION; 3787 } 3788 3789 /** 3790 * Sets the layout animation controller used to animate the group's 3791 * children after the first layout. 3792 * 3793 * @param controller the animation controller 3794 */ 3795 public void setLayoutAnimation(LayoutAnimationController controller) { 3796 mLayoutAnimationController = controller; 3797 if (mLayoutAnimationController != null) { 3798 mGroupFlags |= FLAG_RUN_ANIMATION; 3799 } 3800 } 3801 3802 /** 3803 * Returns the layout animation controller used to animate the group's 3804 * children. 3805 * 3806 * @return the current animation controller 3807 */ 3808 public LayoutAnimationController getLayoutAnimation() { 3809 return mLayoutAnimationController; 3810 } 3811 3812 /** 3813 * Indicates whether the children's drawing cache is used during a layout 3814 * animation. By default, the drawing cache is enabled but this will prevent 3815 * nested layout animations from working. To nest animations, you must disable 3816 * the cache. 3817 * 3818 * @return true if the animation cache is enabled, false otherwise 3819 * 3820 * @see #setAnimationCacheEnabled(boolean) 3821 * @see View#setDrawingCacheEnabled(boolean) 3822 */ 3823 @ViewDebug.ExportedProperty 3824 public boolean isAnimationCacheEnabled() { 3825 return (mGroupFlags & FLAG_ANIMATION_CACHE) == FLAG_ANIMATION_CACHE; 3826 } 3827 3828 /** 3829 * Enables or disables the children's drawing cache during a layout animation. 3830 * By default, the drawing cache is enabled but this will prevent nested 3831 * layout animations from working. To nest animations, you must disable the 3832 * cache. 3833 * 3834 * @param enabled true to enable the animation cache, false otherwise 3835 * 3836 * @see #isAnimationCacheEnabled() 3837 * @see View#setDrawingCacheEnabled(boolean) 3838 */ 3839 public void setAnimationCacheEnabled(boolean enabled) { 3840 setBooleanFlag(FLAG_ANIMATION_CACHE, enabled); 3841 } 3842 3843 /** 3844 * Indicates whether this ViewGroup will always try to draw its children using their 3845 * drawing cache. By default this property is enabled. 3846 * 3847 * @return true if the animation cache is enabled, false otherwise 3848 * 3849 * @see #setAlwaysDrawnWithCacheEnabled(boolean) 3850 * @see #setChildrenDrawnWithCacheEnabled(boolean) 3851 * @see View#setDrawingCacheEnabled(boolean) 3852 */ 3853 @ViewDebug.ExportedProperty(category = "drawing") 3854 public boolean isAlwaysDrawnWithCacheEnabled() { 3855 return (mGroupFlags & FLAG_ALWAYS_DRAWN_WITH_CACHE) == FLAG_ALWAYS_DRAWN_WITH_CACHE; 3856 } 3857 3858 /** 3859 * Indicates whether this ViewGroup will always try to draw its children using their 3860 * drawing cache. This property can be set to true when the cache rendering is 3861 * slightly different from the children's normal rendering. Renderings can be different, 3862 * for instance, when the cache's quality is set to low. 3863 * 3864 * When this property is disabled, the ViewGroup will use the drawing cache of its 3865 * children only when asked to. It's usually the task of subclasses to tell ViewGroup 3866 * when to start using the drawing cache and when to stop using it. 3867 * 3868 * @param always true to always draw with the drawing cache, false otherwise 3869 * 3870 * @see #isAlwaysDrawnWithCacheEnabled() 3871 * @see #setChildrenDrawnWithCacheEnabled(boolean) 3872 * @see View#setDrawingCacheEnabled(boolean) 3873 * @see View#setDrawingCacheQuality(int) 3874 */ 3875 public void setAlwaysDrawnWithCacheEnabled(boolean always) { 3876 setBooleanFlag(FLAG_ALWAYS_DRAWN_WITH_CACHE, always); 3877 } 3878 3879 /** 3880 * Indicates whether the ViewGroup is currently drawing its children using 3881 * their drawing cache. 3882 * 3883 * @return true if children should be drawn with their cache, false otherwise 3884 * 3885 * @see #setAlwaysDrawnWithCacheEnabled(boolean) 3886 * @see #setChildrenDrawnWithCacheEnabled(boolean) 3887 */ 3888 @ViewDebug.ExportedProperty(category = "drawing") 3889 protected boolean isChildrenDrawnWithCacheEnabled() { 3890 return (mGroupFlags & FLAG_CHILDREN_DRAWN_WITH_CACHE) == FLAG_CHILDREN_DRAWN_WITH_CACHE; 3891 } 3892 3893 /** 3894 * Tells the ViewGroup to draw its children using their drawing cache. This property 3895 * is ignored when {@link #isAlwaysDrawnWithCacheEnabled()} is true. A child's drawing cache 3896 * will be used only if it has been enabled. 3897 * 3898 * Subclasses should call this method to start and stop using the drawing cache when 3899 * they perform performance sensitive operations, like scrolling or animating. 3900 * 3901 * @param enabled true if children should be drawn with their cache, false otherwise 3902 * 3903 * @see #setAlwaysDrawnWithCacheEnabled(boolean) 3904 * @see #isChildrenDrawnWithCacheEnabled() 3905 */ 3906 protected void setChildrenDrawnWithCacheEnabled(boolean enabled) { 3907 setBooleanFlag(FLAG_CHILDREN_DRAWN_WITH_CACHE, enabled); 3908 } 3909 3910 /** 3911 * Indicates whether the ViewGroup is drawing its children in the order defined by 3912 * {@link #getChildDrawingOrder(int, int)}. 3913 * 3914 * @return true if children drawing order is defined by {@link #getChildDrawingOrder(int, int)}, 3915 * false otherwise 3916 * 3917 * @see #setChildrenDrawingOrderEnabled(boolean) 3918 * @see #getChildDrawingOrder(int, int) 3919 */ 3920 @ViewDebug.ExportedProperty(category = "drawing") 3921 protected boolean isChildrenDrawingOrderEnabled() { 3922 return (mGroupFlags & FLAG_USE_CHILD_DRAWING_ORDER) == FLAG_USE_CHILD_DRAWING_ORDER; 3923 } 3924 3925 /** 3926 * Tells the ViewGroup whether to draw its children in the order defined by the method 3927 * {@link #getChildDrawingOrder(int, int)}. 3928 * 3929 * @param enabled true if the order of the children when drawing is determined by 3930 * {@link #getChildDrawingOrder(int, int)}, false otherwise 3931 * 3932 * @see #isChildrenDrawingOrderEnabled() 3933 * @see #getChildDrawingOrder(int, int) 3934 */ 3935 protected void setChildrenDrawingOrderEnabled(boolean enabled) { 3936 setBooleanFlag(FLAG_USE_CHILD_DRAWING_ORDER, enabled); 3937 } 3938 3939 private void setBooleanFlag(int flag, boolean value) { 3940 if (value) { 3941 mGroupFlags |= flag; 3942 } else { 3943 mGroupFlags &= ~flag; 3944 } 3945 } 3946 3947 /** 3948 * Returns an integer indicating what types of drawing caches are kept in memory. 3949 * 3950 * @see #setPersistentDrawingCache(int) 3951 * @see #setAnimationCacheEnabled(boolean) 3952 * 3953 * @return one or a combination of {@link #PERSISTENT_NO_CACHE}, 3954 * {@link #PERSISTENT_ANIMATION_CACHE}, {@link #PERSISTENT_SCROLLING_CACHE} 3955 * and {@link #PERSISTENT_ALL_CACHES} 3956 */ 3957 @ViewDebug.ExportedProperty(category = "drawing", mapping = { 3958 @ViewDebug.IntToString(from = PERSISTENT_NO_CACHE, to = "NONE"), 3959 @ViewDebug.IntToString(from = PERSISTENT_ANIMATION_CACHE, to = "ANIMATION"), 3960 @ViewDebug.IntToString(from = PERSISTENT_SCROLLING_CACHE, to = "SCROLLING"), 3961 @ViewDebug.IntToString(from = PERSISTENT_ALL_CACHES, to = "ALL") 3962 }) 3963 public int getPersistentDrawingCache() { 3964 return mPersistentDrawingCache; 3965 } 3966 3967 /** 3968 * Indicates what types of drawing caches should be kept in memory after 3969 * they have been created. 3970 * 3971 * @see #getPersistentDrawingCache() 3972 * @see #setAnimationCacheEnabled(boolean) 3973 * 3974 * @param drawingCacheToKeep one or a combination of {@link #PERSISTENT_NO_CACHE}, 3975 * {@link #PERSISTENT_ANIMATION_CACHE}, {@link #PERSISTENT_SCROLLING_CACHE} 3976 * and {@link #PERSISTENT_ALL_CACHES} 3977 */ 3978 public void setPersistentDrawingCache(int drawingCacheToKeep) { 3979 mPersistentDrawingCache = drawingCacheToKeep & PERSISTENT_ALL_CACHES; 3980 } 3981 3982 /** 3983 * Returns a new set of layout parameters based on the supplied attributes set. 3984 * 3985 * @param attrs the attributes to build the layout parameters from 3986 * 3987 * @return an instance of {@link android.view.ViewGroup.LayoutParams} or one 3988 * of its descendants 3989 */ 3990 public LayoutParams generateLayoutParams(AttributeSet attrs) { 3991 return new LayoutParams(getContext(), attrs); 3992 } 3993 3994 /** 3995 * Returns a safe set of layout parameters based on the supplied layout params. 3996 * When a ViewGroup is passed a View whose layout params do not pass the test of 3997 * {@link #checkLayoutParams(android.view.ViewGroup.LayoutParams)}, this method 3998 * is invoked. This method should return a new set of layout params suitable for 3999 * this ViewGroup, possibly by copying the appropriate attributes from the 4000 * specified set of layout params. 4001 * 4002 * @param p The layout parameters to convert into a suitable set of layout parameters 4003 * for this ViewGroup. 4004 * 4005 * @return an instance of {@link android.view.ViewGroup.LayoutParams} or one 4006 * of its descendants 4007 */ 4008 protected LayoutParams generateLayoutParams(ViewGroup.LayoutParams p) { 4009 return p; 4010 } 4011 4012 /** 4013 * Returns a set of default layout parameters. These parameters are requested 4014 * when the View passed to {@link #addView(View)} has no layout parameters 4015 * already set. If null is returned, an exception is thrown from addView. 4016 * 4017 * @return a set of default layout parameters or null 4018 */ 4019 protected LayoutParams generateDefaultLayoutParams() { 4020 return new LayoutParams(LayoutParams.WRAP_CONTENT, LayoutParams.WRAP_CONTENT); 4021 } 4022 4023 /** 4024 * @hide 4025 */ 4026 @Override 4027 protected boolean dispatchConsistencyCheck(int consistency) { 4028 boolean result = super.dispatchConsistencyCheck(consistency); 4029 4030 final int count = mChildrenCount; 4031 final View[] children = mChildren; 4032 for (int i = 0; i < count; i++) { 4033 if (!children[i].dispatchConsistencyCheck(consistency)) result = false; 4034 } 4035 4036 return result; 4037 } 4038 4039 /** 4040 * @hide 4041 */ 4042 @Override 4043 protected boolean onConsistencyCheck(int consistency) { 4044 boolean result = super.onConsistencyCheck(consistency); 4045 4046 final boolean checkLayout = (consistency & ViewDebug.CONSISTENCY_LAYOUT) != 0; 4047 final boolean checkDrawing = (consistency & ViewDebug.CONSISTENCY_DRAWING) != 0; 4048 4049 if (checkLayout) { 4050 final int count = mChildrenCount; 4051 final View[] children = mChildren; 4052 for (int i = 0; i < count; i++) { 4053 if (children[i].getParent() != this) { 4054 result = false; 4055 android.util.Log.d(ViewDebug.CONSISTENCY_LOG_TAG, 4056 "View " + children[i] + " has no parent/a parent that is not " + this); 4057 } 4058 } 4059 } 4060 4061 if (checkDrawing) { 4062 // If this group is dirty, check that the parent is dirty as well 4063 if ((mPrivateFlags & DIRTY_MASK) != 0) { 4064 final ViewParent parent = getParent(); 4065 if (parent != null && !(parent instanceof ViewRoot)) { 4066 if ((((View) parent).mPrivateFlags & DIRTY_MASK) == 0) { 4067 result = false; 4068 android.util.Log.d(ViewDebug.CONSISTENCY_LOG_TAG, 4069 "ViewGroup " + this + " is dirty but its parent is not: " + this); 4070 } 4071 } 4072 } 4073 } 4074 4075 return result; 4076 } 4077 4078 /** 4079 * {@inheritDoc} 4080 */ 4081 @Override 4082 protected void debug(int depth) { 4083 super.debug(depth); 4084 String output; 4085 4086 if (mFocused != null) { 4087 output = debugIndent(depth); 4088 output += "mFocused"; 4089 Log.d(VIEW_LOG_TAG, output); 4090 } 4091 if (mChildrenCount != 0) { 4092 output = debugIndent(depth); 4093 output += "{"; 4094 Log.d(VIEW_LOG_TAG, output); 4095 } 4096 int count = mChildrenCount; 4097 for (int i = 0; i < count; i++) { 4098 View child = mChildren[i]; 4099 child.debug(depth + 1); 4100 } 4101 4102 if (mChildrenCount != 0) { 4103 output = debugIndent(depth); 4104 output += "}"; 4105 Log.d(VIEW_LOG_TAG, output); 4106 } 4107 } 4108 4109 /** 4110 * Returns the position in the group of the specified child view. 4111 * 4112 * @param child the view for which to get the position 4113 * @return a positive integer representing the position of the view in the 4114 * group, or -1 if the view does not exist in the group 4115 */ 4116 public int indexOfChild(View child) { 4117 final int count = mChildrenCount; 4118 final View[] children = mChildren; 4119 for (int i = 0; i < count; i++) { 4120 if (children[i] == child) { 4121 return i; 4122 } 4123 } 4124 return -1; 4125 } 4126 4127 /** 4128 * Returns the number of children in the group. 4129 * 4130 * @return a positive integer representing the number of children in 4131 * the group 4132 */ 4133 public int getChildCount() { 4134 return mChildrenCount; 4135 } 4136 4137 /** 4138 * Returns the view at the specified position in the group. 4139 * 4140 * @param index the position at which to get the view from 4141 * @return the view at the specified position or null if the position 4142 * does not exist within the group 4143 */ 4144 public View getChildAt(int index) { 4145 try { 4146 return mChildren[index]; 4147 } catch (IndexOutOfBoundsException ex) { 4148 return null; 4149 } 4150 } 4151 4152 /** 4153 * Ask all of the children of this view to measure themselves, taking into 4154 * account both the MeasureSpec requirements for this view and its padding. 4155 * We skip children that are in the GONE state The heavy lifting is done in 4156 * getChildMeasureSpec. 4157 * 4158 * @param widthMeasureSpec The width requirements for this view 4159 * @param heightMeasureSpec The height requirements for this view 4160 */ 4161 protected void measureChildren(int widthMeasureSpec, int heightMeasureSpec) { 4162 final int size = mChildrenCount; 4163 final View[] children = mChildren; 4164 for (int i = 0; i < size; ++i) { 4165 final View child = children[i]; 4166 if ((child.mViewFlags & VISIBILITY_MASK) != GONE) { 4167 measureChild(child, widthMeasureSpec, heightMeasureSpec); 4168 } 4169 } 4170 } 4171 4172 /** 4173 * Ask one of the children of this view to measure itself, taking into 4174 * account both the MeasureSpec requirements for this view and its padding. 4175 * The heavy lifting is done in getChildMeasureSpec. 4176 * 4177 * @param child The child to measure 4178 * @param parentWidthMeasureSpec The width requirements for this view 4179 * @param parentHeightMeasureSpec The height requirements for this view 4180 */ 4181 protected void measureChild(View child, int parentWidthMeasureSpec, 4182 int parentHeightMeasureSpec) { 4183 final LayoutParams lp = child.getLayoutParams(); 4184 4185 final int childWidthMeasureSpec = getChildMeasureSpec(parentWidthMeasureSpec, 4186 mPaddingLeft + mPaddingRight, lp.width); 4187 final int childHeightMeasureSpec = getChildMeasureSpec(parentHeightMeasureSpec, 4188 mPaddingTop + mPaddingBottom, lp.height); 4189 4190 child.measure(childWidthMeasureSpec, childHeightMeasureSpec); 4191 } 4192 4193 /** 4194 * Ask one of the children of this view to measure itself, taking into 4195 * account both the MeasureSpec requirements for this view and its padding 4196 * and margins. The child must have MarginLayoutParams The heavy lifting is 4197 * done in getChildMeasureSpec. 4198 * 4199 * @param child The child to measure 4200 * @param parentWidthMeasureSpec The width requirements for this view 4201 * @param widthUsed Extra space that has been used up by the parent 4202 * horizontally (possibly by other children of the parent) 4203 * @param parentHeightMeasureSpec The height requirements for this view 4204 * @param heightUsed Extra space that has been used up by the parent 4205 * vertically (possibly by other children of the parent) 4206 */ 4207 protected void measureChildWithMargins(View child, 4208 int parentWidthMeasureSpec, int widthUsed, 4209 int parentHeightMeasureSpec, int heightUsed) { 4210 final MarginLayoutParams lp = (MarginLayoutParams) child.getLayoutParams(); 4211 4212 final int childWidthMeasureSpec = getChildMeasureSpec(parentWidthMeasureSpec, 4213 mPaddingLeft + mPaddingRight + lp.leftMargin + lp.rightMargin 4214 + widthUsed, lp.width); 4215 final int childHeightMeasureSpec = getChildMeasureSpec(parentHeightMeasureSpec, 4216 mPaddingTop + mPaddingBottom + lp.topMargin + lp.bottomMargin 4217 + heightUsed, lp.height); 4218 4219 child.measure(childWidthMeasureSpec, childHeightMeasureSpec); 4220 } 4221 4222 /** 4223 * Does the hard part of measureChildren: figuring out the MeasureSpec to 4224 * pass to a particular child. This method figures out the right MeasureSpec 4225 * for one dimension (height or width) of one child view. 4226 * 4227 * The goal is to combine information from our MeasureSpec with the 4228 * LayoutParams of the child to get the best possible results. For example, 4229 * if the this view knows its size (because its MeasureSpec has a mode of 4230 * EXACTLY), and the child has indicated in its LayoutParams that it wants 4231 * to be the same size as the parent, the parent should ask the child to 4232 * layout given an exact size. 4233 * 4234 * @param spec The requirements for this view 4235 * @param padding The padding of this view for the current dimension and 4236 * margins, if applicable 4237 * @param childDimension How big the child wants to be in the current 4238 * dimension 4239 * @return a MeasureSpec integer for the child 4240 */ 4241 public static int getChildMeasureSpec(int spec, int padding, int childDimension) { 4242 int specMode = MeasureSpec.getMode(spec); 4243 int specSize = MeasureSpec.getSize(spec); 4244 4245 int size = Math.max(0, specSize - padding); 4246 4247 int resultSize = 0; 4248 int resultMode = 0; 4249 4250 switch (specMode) { 4251 // Parent has imposed an exact size on us 4252 case MeasureSpec.EXACTLY: 4253 if (childDimension >= 0) { 4254 resultSize = childDimension; 4255 resultMode = MeasureSpec.EXACTLY; 4256 } else if (childDimension == LayoutParams.MATCH_PARENT) { 4257 // Child wants to be our size. So be it. 4258 resultSize = size; 4259 resultMode = MeasureSpec.EXACTLY; 4260 } else if (childDimension == LayoutParams.WRAP_CONTENT) { 4261 // Child wants to determine its own size. It can't be 4262 // bigger than us. 4263 resultSize = size; 4264 resultMode = MeasureSpec.AT_MOST; 4265 } 4266 break; 4267 4268 // Parent has imposed a maximum size on us 4269 case MeasureSpec.AT_MOST: 4270 if (childDimension >= 0) { 4271 // Child wants a specific size... so be it 4272 resultSize = childDimension; 4273 resultMode = MeasureSpec.EXACTLY; 4274 } else if (childDimension == LayoutParams.MATCH_PARENT) { 4275 // Child wants to be our size, but our size is not fixed. 4276 // Constrain child to not be bigger than us. 4277 resultSize = size; 4278 resultMode = MeasureSpec.AT_MOST; 4279 } else if (childDimension == LayoutParams.WRAP_CONTENT) { 4280 // Child wants to determine its own size. It can't be 4281 // bigger than us. 4282 resultSize = size; 4283 resultMode = MeasureSpec.AT_MOST; 4284 } 4285 break; 4286 4287 // Parent asked to see how big we want to be 4288 case MeasureSpec.UNSPECIFIED: 4289 if (childDimension >= 0) { 4290 // Child wants a specific size... let him have it 4291 resultSize = childDimension; 4292 resultMode = MeasureSpec.EXACTLY; 4293 } else if (childDimension == LayoutParams.MATCH_PARENT) { 4294 // Child wants to be our size... find out how big it should 4295 // be 4296 resultSize = 0; 4297 resultMode = MeasureSpec.UNSPECIFIED; 4298 } else if (childDimension == LayoutParams.WRAP_CONTENT) { 4299 // Child wants to determine its own size.... find out how 4300 // big it should be 4301 resultSize = 0; 4302 resultMode = MeasureSpec.UNSPECIFIED; 4303 } 4304 break; 4305 } 4306 return MeasureSpec.makeMeasureSpec(resultSize, resultMode); 4307 } 4308 4309 4310 /** 4311 * Removes any pending animations for views that have been removed. Call 4312 * this if you don't want animations for exiting views to stack up. 4313 */ 4314 public void clearDisappearingChildren() { 4315 if (mDisappearingChildren != null) { 4316 mDisappearingChildren.clear(); 4317 } 4318 } 4319 4320 /** 4321 * Add a view which is removed from mChildren but still needs animation 4322 * 4323 * @param v View to add 4324 */ 4325 private void addDisappearingView(View v) { 4326 ArrayList<View> disappearingChildren = mDisappearingChildren; 4327 4328 if (disappearingChildren == null) { 4329 disappearingChildren = mDisappearingChildren = new ArrayList<View>(); 4330 } 4331 4332 disappearingChildren.add(v); 4333 } 4334 4335 /** 4336 * Cleanup a view when its animation is done. This may mean removing it from 4337 * the list of disappearing views. 4338 * 4339 * @param view The view whose animation has finished 4340 * @param animation The animation, cannot be null 4341 */ 4342 private void finishAnimatingView(final View view, Animation animation) { 4343 final ArrayList<View> disappearingChildren = mDisappearingChildren; 4344 if (disappearingChildren != null) { 4345 if (disappearingChildren.contains(view)) { 4346 disappearingChildren.remove(view); 4347 4348 if (view.mAttachInfo != null) { 4349 view.dispatchDetachedFromWindow(); 4350 } 4351 4352 view.clearAnimation(); 4353 mGroupFlags |= FLAG_INVALIDATE_REQUIRED; 4354 } 4355 } 4356 4357 if (animation != null && !animation.getFillAfter()) { 4358 view.clearAnimation(); 4359 } 4360 4361 if ((view.mPrivateFlags & ANIMATION_STARTED) == ANIMATION_STARTED) { 4362 view.onAnimationEnd(); 4363 // Should be performed by onAnimationEnd() but this avoid an infinite loop, 4364 // so we'd rather be safe than sorry 4365 view.mPrivateFlags &= ~ANIMATION_STARTED; 4366 // Draw one more frame after the animation is done 4367 mGroupFlags |= FLAG_INVALIDATE_REQUIRED; 4368 } 4369 } 4370 4371 /** 4372 * This method tells the ViewGroup that the given View object, which should have this 4373 * ViewGroup as its parent, 4374 * should be kept around (re-displayed when the ViewGroup draws its children) even if it 4375 * is removed from its parent. This allows animations, such as those used by 4376 * {@link android.app.Fragment} and {@link android.animation.LayoutTransition} to animate 4377 * the removal of views. A call to this method should always be accompanied by a later call 4378 * to {@link #endViewTransition(View)}, such as after an animation on the View has finished, 4379 * so that the View finally gets removed. 4380 * 4381 * @param view The View object to be kept visible even if it gets removed from its parent. 4382 */ 4383 public void startViewTransition(View view) { 4384 if (view.mParent == this) { 4385 if (mTransitioningViews == null) { 4386 mTransitioningViews = new ArrayList<View>(); 4387 } 4388 mTransitioningViews.add(view); 4389 } 4390 } 4391 4392 /** 4393 * This method should always be called following an earlier call to 4394 * {@link #startViewTransition(View)}. The given View is finally removed from its parent 4395 * and will no longer be displayed. Note that this method does not perform the functionality 4396 * of removing a view from its parent; it just discontinues the display of a View that 4397 * has previously been removed. 4398 * 4399 * @return view The View object that has been removed but is being kept around in the visible 4400 * hierarchy by an earlier call to {@link #startViewTransition(View)}. 4401 */ 4402 public void endViewTransition(View view) { 4403 if (mTransitioningViews != null) { 4404 mTransitioningViews.remove(view); 4405 final ArrayList<View> disappearingChildren = mDisappearingChildren; 4406 if (disappearingChildren != null && disappearingChildren.contains(view)) { 4407 disappearingChildren.remove(view); 4408 if (mVisibilityChangingChildren != null && 4409 mVisibilityChangingChildren.contains(view)) { 4410 mVisibilityChangingChildren.remove(view); 4411 } else { 4412 if (view.mAttachInfo != null) { 4413 view.dispatchDetachedFromWindow(); 4414 } 4415 if (view.mParent != null) { 4416 view.mParent = null; 4417 } 4418 } 4419 mGroupFlags |= FLAG_INVALIDATE_REQUIRED; 4420 } 4421 } 4422 } 4423 4424 private LayoutTransition.TransitionListener mLayoutTransitionListener = 4425 new LayoutTransition.TransitionListener() { 4426 @Override 4427 public void startTransition(LayoutTransition transition, ViewGroup container, 4428 View view, int transitionType) { 4429 // We only care about disappearing items, since we need special logic to keep 4430 // those items visible after they've been 'removed' 4431 if (transitionType == LayoutTransition.DISAPPEARING) { 4432 startViewTransition(view); 4433 } 4434 } 4435 4436 @Override 4437 public void endTransition(LayoutTransition transition, ViewGroup container, 4438 View view, int transitionType) { 4439 if (mLayoutSuppressed && !transition.isChangingLayout()) { 4440 requestLayout(); 4441 mLayoutSuppressed = false; 4442 } 4443 if (transitionType == LayoutTransition.DISAPPEARING && mTransitioningViews != null) { 4444 endViewTransition(view); 4445 } 4446 } 4447 }; 4448 4449 /** 4450 * {@inheritDoc} 4451 */ 4452 @Override 4453 public boolean gatherTransparentRegion(Region region) { 4454 // If no transparent regions requested, we are always opaque. 4455 final boolean meOpaque = (mPrivateFlags & View.REQUEST_TRANSPARENT_REGIONS) == 0; 4456 if (meOpaque && region == null) { 4457 // The caller doesn't care about the region, so stop now. 4458 return true; 4459 } 4460 super.gatherTransparentRegion(region); 4461 final View[] children = mChildren; 4462 final int count = mChildrenCount; 4463 boolean noneOfTheChildrenAreTransparent = true; 4464 for (int i = 0; i < count; i++) { 4465 final View child = children[i]; 4466 if ((child.mViewFlags & VISIBILITY_MASK) == VISIBLE || child.getAnimation() != null) { 4467 if (!child.gatherTransparentRegion(region)) { 4468 noneOfTheChildrenAreTransparent = false; 4469 } 4470 } 4471 } 4472 return meOpaque || noneOfTheChildrenAreTransparent; 4473 } 4474 4475 /** 4476 * {@inheritDoc} 4477 */ 4478 public void requestTransparentRegion(View child) { 4479 if (child != null) { 4480 child.mPrivateFlags |= View.REQUEST_TRANSPARENT_REGIONS; 4481 if (mParent != null) { 4482 mParent.requestTransparentRegion(this); 4483 } 4484 } 4485 } 4486 4487 4488 @Override 4489 protected boolean fitSystemWindows(Rect insets) { 4490 boolean done = super.fitSystemWindows(insets); 4491 if (!done) { 4492 final int count = mChildrenCount; 4493 final View[] children = mChildren; 4494 for (int i = 0; i < count; i++) { 4495 done = children[i].fitSystemWindows(insets); 4496 if (done) { 4497 break; 4498 } 4499 } 4500 } 4501 return done; 4502 } 4503 4504 /** 4505 * Returns the animation listener to which layout animation events are 4506 * sent. 4507 * 4508 * @return an {@link android.view.animation.Animation.AnimationListener} 4509 */ 4510 public Animation.AnimationListener getLayoutAnimationListener() { 4511 return mAnimationListener; 4512 } 4513 4514 @Override 4515 protected void drawableStateChanged() { 4516 super.drawableStateChanged(); 4517 4518 if ((mGroupFlags & FLAG_NOTIFY_CHILDREN_ON_DRAWABLE_STATE_CHANGE) != 0) { 4519 if ((mGroupFlags & FLAG_ADD_STATES_FROM_CHILDREN) != 0) { 4520 throw new IllegalStateException("addStateFromChildren cannot be enabled if a" 4521 + " child has duplicateParentState set to true"); 4522 } 4523 4524 final View[] children = mChildren; 4525 final int count = mChildrenCount; 4526 4527 for (int i = 0; i < count; i++) { 4528 final View child = children[i]; 4529 if ((child.mViewFlags & DUPLICATE_PARENT_STATE) != 0) { 4530 child.refreshDrawableState(); 4531 } 4532 } 4533 } 4534 } 4535 4536 @Override 4537 public void jumpDrawablesToCurrentState() { 4538 super.jumpDrawablesToCurrentState(); 4539 final View[] children = mChildren; 4540 final int count = mChildrenCount; 4541 for (int i = 0; i < count; i++) { 4542 children[i].jumpDrawablesToCurrentState(); 4543 } 4544 } 4545 4546 @Override 4547 protected int[] onCreateDrawableState(int extraSpace) { 4548 if ((mGroupFlags & FLAG_ADD_STATES_FROM_CHILDREN) == 0) { 4549 return super.onCreateDrawableState(extraSpace); 4550 } 4551 4552 int need = 0; 4553 int n = getChildCount(); 4554 for (int i = 0; i < n; i++) { 4555 int[] childState = getChildAt(i).getDrawableState(); 4556 4557 if (childState != null) { 4558 need += childState.length; 4559 } 4560 } 4561 4562 int[] state = super.onCreateDrawableState(extraSpace + need); 4563 4564 for (int i = 0; i < n; i++) { 4565 int[] childState = getChildAt(i).getDrawableState(); 4566 4567 if (childState != null) { 4568 state = mergeDrawableStates(state, childState); 4569 } 4570 } 4571 4572 return state; 4573 } 4574 4575 /** 4576 * Sets whether this ViewGroup's drawable states also include 4577 * its children's drawable states. This is used, for example, to 4578 * make a group appear to be focused when its child EditText or button 4579 * is focused. 4580 */ 4581 public void setAddStatesFromChildren(boolean addsStates) { 4582 if (addsStates) { 4583 mGroupFlags |= FLAG_ADD_STATES_FROM_CHILDREN; 4584 } else { 4585 mGroupFlags &= ~FLAG_ADD_STATES_FROM_CHILDREN; 4586 } 4587 4588 refreshDrawableState(); 4589 } 4590 4591 /** 4592 * Returns whether this ViewGroup's drawable states also include 4593 * its children's drawable states. This is used, for example, to 4594 * make a group appear to be focused when its child EditText or button 4595 * is focused. 4596 */ 4597 public boolean addStatesFromChildren() { 4598 return (mGroupFlags & FLAG_ADD_STATES_FROM_CHILDREN) != 0; 4599 } 4600 4601 /** 4602 * If {link #addStatesFromChildren} is true, refreshes this group's 4603 * drawable state (to include the states from its children). 4604 */ 4605 public void childDrawableStateChanged(View child) { 4606 if ((mGroupFlags & FLAG_ADD_STATES_FROM_CHILDREN) != 0) { 4607 refreshDrawableState(); 4608 } 4609 } 4610 4611 /** 4612 * Specifies the animation listener to which layout animation events must 4613 * be sent. Only 4614 * {@link android.view.animation.Animation.AnimationListener#onAnimationStart(Animation)} 4615 * and 4616 * {@link android.view.animation.Animation.AnimationListener#onAnimationEnd(Animation)} 4617 * are invoked. 4618 * 4619 * @param animationListener the layout animation listener 4620 */ 4621 public void setLayoutAnimationListener(Animation.AnimationListener animationListener) { 4622 mAnimationListener = animationListener; 4623 } 4624 4625 /** 4626 * LayoutParams are used by views to tell their parents how they want to be 4627 * laid out. See 4628 * {@link android.R.styleable#ViewGroup_Layout ViewGroup Layout Attributes} 4629 * for a list of all child view attributes that this class supports. 4630 * 4631 * <p> 4632 * The base LayoutParams class just describes how big the view wants to be 4633 * for both width and height. For each dimension, it can specify one of: 4634 * <ul> 4635 * <li>FILL_PARENT (renamed MATCH_PARENT in API Level 8 and higher), which 4636 * means that the view wants to be as big as its parent (minus padding) 4637 * <li> WRAP_CONTENT, which means that the view wants to be just big enough 4638 * to enclose its content (plus padding) 4639 * <li> an exact number 4640 * </ul> 4641 * There are subclasses of LayoutParams for different subclasses of 4642 * ViewGroup. For example, AbsoluteLayout has its own subclass of 4643 * LayoutParams which adds an X and Y value. 4644 * 4645 * @attr ref android.R.styleable#ViewGroup_Layout_layout_height 4646 * @attr ref android.R.styleable#ViewGroup_Layout_layout_width 4647 */ 4648 public static class LayoutParams { 4649 /** 4650 * Special value for the height or width requested by a View. 4651 * FILL_PARENT means that the view wants to be as big as its parent, 4652 * minus the parent's padding, if any. This value is deprecated 4653 * starting in API Level 8 and replaced by {@link #MATCH_PARENT}. 4654 */ 4655 @SuppressWarnings({"UnusedDeclaration"}) 4656 @Deprecated 4657 public static final int FILL_PARENT = -1; 4658 4659 /** 4660 * Special value for the height or width requested by a View. 4661 * MATCH_PARENT means that the view wants to be as big as its parent, 4662 * minus the parent's padding, if any. Introduced in API Level 8. 4663 */ 4664 public static final int MATCH_PARENT = -1; 4665 4666 /** 4667 * Special value for the height or width requested by a View. 4668 * WRAP_CONTENT means that the view wants to be just large enough to fit 4669 * its own internal content, taking its own padding into account. 4670 */ 4671 public static final int WRAP_CONTENT = -2; 4672 4673 /** 4674 * Information about how wide the view wants to be. Can be one of the 4675 * constants FILL_PARENT (replaced by MATCH_PARENT , 4676 * in API Level 8) or WRAP_CONTENT. or an exact size. 4677 */ 4678 @ViewDebug.ExportedProperty(category = "layout", mapping = { 4679 @ViewDebug.IntToString(from = MATCH_PARENT, to = "MATCH_PARENT"), 4680 @ViewDebug.IntToString(from = WRAP_CONTENT, to = "WRAP_CONTENT") 4681 }) 4682 public int width; 4683 4684 /** 4685 * Information about how tall the view wants to be. Can be one of the 4686 * constants FILL_PARENT (replaced by MATCH_PARENT , 4687 * in API Level 8) or WRAP_CONTENT. or an exact size. 4688 */ 4689 @ViewDebug.ExportedProperty(category = "layout", mapping = { 4690 @ViewDebug.IntToString(from = MATCH_PARENT, to = "MATCH_PARENT"), 4691 @ViewDebug.IntToString(from = WRAP_CONTENT, to = "WRAP_CONTENT") 4692 }) 4693 public int height; 4694 4695 /** 4696 * Used to animate layouts. 4697 */ 4698 public LayoutAnimationController.AnimationParameters layoutAnimationParameters; 4699 4700 /** 4701 * Creates a new set of layout parameters. The values are extracted from 4702 * the supplied attributes set and context. The XML attributes mapped 4703 * to this set of layout parameters are: 4704 * 4705 * <ul> 4706 * <li><code>layout_width</code>: the width, either an exact value, 4707 * {@link #WRAP_CONTENT}, or {@link #FILL_PARENT} (replaced by 4708 * {@link #MATCH_PARENT} in API Level 8)</li> 4709 * <li><code>layout_height</code>: the height, either an exact value, 4710 * {@link #WRAP_CONTENT}, or {@link #FILL_PARENT} (replaced by 4711 * {@link #MATCH_PARENT} in API Level 8)</li> 4712 * </ul> 4713 * 4714 * @param c the application environment 4715 * @param attrs the set of attributes from which to extract the layout 4716 * parameters' values 4717 */ 4718 public LayoutParams(Context c, AttributeSet attrs) { 4719 TypedArray a = c.obtainStyledAttributes(attrs, R.styleable.ViewGroup_Layout); 4720 setBaseAttributes(a, 4721 R.styleable.ViewGroup_Layout_layout_width, 4722 R.styleable.ViewGroup_Layout_layout_height); 4723 a.recycle(); 4724 } 4725 4726 /** 4727 * Creates a new set of layout parameters with the specified width 4728 * and height. 4729 * 4730 * @param width the width, either {@link #WRAP_CONTENT}, 4731 * {@link #FILL_PARENT} (replaced by {@link #MATCH_PARENT} in 4732 * API Level 8), or a fixed size in pixels 4733 * @param height the height, either {@link #WRAP_CONTENT}, 4734 * {@link #FILL_PARENT} (replaced by {@link #MATCH_PARENT} in 4735 * API Level 8), or a fixed size in pixels 4736 */ 4737 public LayoutParams(int width, int height) { 4738 this.width = width; 4739 this.height = height; 4740 } 4741 4742 /** 4743 * Copy constructor. Clones the width and height values of the source. 4744 * 4745 * @param source The layout params to copy from. 4746 */ 4747 public LayoutParams(LayoutParams source) { 4748 this.width = source.width; 4749 this.height = source.height; 4750 } 4751 4752 /** 4753 * Used internally by MarginLayoutParams. 4754 * @hide 4755 */ 4756 LayoutParams() { 4757 } 4758 4759 /** 4760 * Extracts the layout parameters from the supplied attributes. 4761 * 4762 * @param a the style attributes to extract the parameters from 4763 * @param widthAttr the identifier of the width attribute 4764 * @param heightAttr the identifier of the height attribute 4765 */ 4766 protected void setBaseAttributes(TypedArray a, int widthAttr, int heightAttr) { 4767 width = a.getLayoutDimension(widthAttr, "layout_width"); 4768 height = a.getLayoutDimension(heightAttr, "layout_height"); 4769 } 4770 4771 /** 4772 * Returns a String representation of this set of layout parameters. 4773 * 4774 * @param output the String to prepend to the internal representation 4775 * @return a String with the following format: output + 4776 * "ViewGroup.LayoutParams={ width=WIDTH, height=HEIGHT }" 4777 * 4778 * @hide 4779 */ 4780 public String debug(String output) { 4781 return output + "ViewGroup.LayoutParams={ width=" 4782 + sizeToString(width) + ", height=" + sizeToString(height) + " }"; 4783 } 4784 4785 /** 4786 * Converts the specified size to a readable String. 4787 * 4788 * @param size the size to convert 4789 * @return a String instance representing the supplied size 4790 * 4791 * @hide 4792 */ 4793 protected static String sizeToString(int size) { 4794 if (size == WRAP_CONTENT) { 4795 return "wrap-content"; 4796 } 4797 if (size == MATCH_PARENT) { 4798 return "match-parent"; 4799 } 4800 return String.valueOf(size); 4801 } 4802 } 4803 4804 /** 4805 * Per-child layout information for layouts that support margins. 4806 * See 4807 * {@link android.R.styleable#ViewGroup_MarginLayout ViewGroup Margin Layout Attributes} 4808 * for a list of all child view attributes that this class supports. 4809 */ 4810 public static class MarginLayoutParams extends ViewGroup.LayoutParams { 4811 /** 4812 * The left margin in pixels of the child. 4813 */ 4814 @ViewDebug.ExportedProperty(category = "layout") 4815 public int leftMargin; 4816 4817 /** 4818 * The top margin in pixels of the child. 4819 */ 4820 @ViewDebug.ExportedProperty(category = "layout") 4821 public int topMargin; 4822 4823 /** 4824 * The right margin in pixels of the child. 4825 */ 4826 @ViewDebug.ExportedProperty(category = "layout") 4827 public int rightMargin; 4828 4829 /** 4830 * The bottom margin in pixels of the child. 4831 */ 4832 @ViewDebug.ExportedProperty(category = "layout") 4833 public int bottomMargin; 4834 4835 /** 4836 * Creates a new set of layout parameters. The values are extracted from 4837 * the supplied attributes set and context. 4838 * 4839 * @param c the application environment 4840 * @param attrs the set of attributes from which to extract the layout 4841 * parameters' values 4842 */ 4843 public MarginLayoutParams(Context c, AttributeSet attrs) { 4844 super(); 4845 4846 TypedArray a = c.obtainStyledAttributes(attrs, R.styleable.ViewGroup_MarginLayout); 4847 setBaseAttributes(a, 4848 R.styleable.ViewGroup_MarginLayout_layout_width, 4849 R.styleable.ViewGroup_MarginLayout_layout_height); 4850 4851 int margin = a.getDimensionPixelSize( 4852 com.android.internal.R.styleable.ViewGroup_MarginLayout_layout_margin, -1); 4853 if (margin >= 0) { 4854 leftMargin = margin; 4855 topMargin = margin; 4856 rightMargin= margin; 4857 bottomMargin = margin; 4858 } else { 4859 leftMargin = a.getDimensionPixelSize( 4860 R.styleable.ViewGroup_MarginLayout_layout_marginLeft, 0); 4861 topMargin = a.getDimensionPixelSize( 4862 R.styleable.ViewGroup_MarginLayout_layout_marginTop, 0); 4863 rightMargin = a.getDimensionPixelSize( 4864 R.styleable.ViewGroup_MarginLayout_layout_marginRight, 0); 4865 bottomMargin = a.getDimensionPixelSize( 4866 R.styleable.ViewGroup_MarginLayout_layout_marginBottom, 0); 4867 } 4868 4869 a.recycle(); 4870 } 4871 4872 /** 4873 * {@inheritDoc} 4874 */ 4875 public MarginLayoutParams(int width, int height) { 4876 super(width, height); 4877 } 4878 4879 /** 4880 * Copy constructor. Clones the width, height and margin values of the source. 4881 * 4882 * @param source The layout params to copy from. 4883 */ 4884 public MarginLayoutParams(MarginLayoutParams source) { 4885 this.width = source.width; 4886 this.height = source.height; 4887 4888 this.leftMargin = source.leftMargin; 4889 this.topMargin = source.topMargin; 4890 this.rightMargin = source.rightMargin; 4891 this.bottomMargin = source.bottomMargin; 4892 } 4893 4894 /** 4895 * {@inheritDoc} 4896 */ 4897 public MarginLayoutParams(LayoutParams source) { 4898 super(source); 4899 } 4900 4901 /** 4902 * Sets the margins, in pixels. 4903 * 4904 * @param left the left margin size 4905 * @param top the top margin size 4906 * @param right the right margin size 4907 * @param bottom the bottom margin size 4908 * 4909 * @attr ref android.R.styleable#ViewGroup_MarginLayout_layout_marginLeft 4910 * @attr ref android.R.styleable#ViewGroup_MarginLayout_layout_marginTop 4911 * @attr ref android.R.styleable#ViewGroup_MarginLayout_layout_marginRight 4912 * @attr ref android.R.styleable#ViewGroup_MarginLayout_layout_marginBottom 4913 */ 4914 public void setMargins(int left, int top, int right, int bottom) { 4915 leftMargin = left; 4916 topMargin = top; 4917 rightMargin = right; 4918 bottomMargin = bottom; 4919 } 4920 } 4921 4922 /* Describes a touched view and the ids of the pointers that it has captured. 4923 * 4924 * This code assumes that pointer ids are always in the range 0..31 such that 4925 * it can use a bitfield to track which pointer ids are present. 4926 * As it happens, the lower layers of the input dispatch pipeline also use the 4927 * same trick so the assumption should be safe here... 4928 */ 4929 private static final class TouchTarget { 4930 private static final int MAX_RECYCLED = 32; 4931 private static final Object sRecycleLock = new Object(); 4932 private static TouchTarget sRecycleBin; 4933 private static int sRecycledCount; 4934 4935 public static final int ALL_POINTER_IDS = -1; // all ones 4936 4937 // The touched child view. 4938 public View child; 4939 4940 // The combined bit mask of pointer ids for all pointers captured by the target. 4941 public int pointerIdBits; 4942 4943 // The next target in the target list. 4944 public TouchTarget next; 4945 4946 private TouchTarget() { 4947 } 4948 4949 public static TouchTarget obtain(View child, int pointerIdBits) { 4950 final TouchTarget target; 4951 synchronized (sRecycleLock) { 4952 if (sRecycleBin == null) { 4953 target = new TouchTarget(); 4954 } else { 4955 target = sRecycleBin; 4956 sRecycleBin = target.next; 4957 sRecycledCount--; 4958 target.next = null; 4959 } 4960 } 4961 target.child = child; 4962 target.pointerIdBits = pointerIdBits; 4963 return target; 4964 } 4965 4966 public void recycle() { 4967 synchronized (sRecycleLock) { 4968 if (sRecycledCount < MAX_RECYCLED) { 4969 next = sRecycleBin; 4970 sRecycleBin = this; 4971 sRecycledCount += 1; 4972 } else { 4973 next = null; 4974 } 4975 child = null; 4976 } 4977 } 4978 } 4979} 4980