ViewGroup.java revision db94b0a5b071bafd5ae8cb9735528aa9d4b31cc8
1/* 2 * Copyright (C) 2006 The Android Open Source Project 3 * 4 * Licensed under the Apache License, Version 2.0 (the "License"); 5 * you may not use this file except in compliance with the License. 6 * You may obtain a copy of the License at 7 * 8 * http://www.apache.org/licenses/LICENSE-2.0 9 * 10 * Unless required by applicable law or agreed to in writing, software 11 * distributed under the License is distributed on an "AS IS" BASIS, 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 13 * See the License for the specific language governing permissions and 14 * limitations under the License. 15 */ 16 17package android.view; 18 19import android.animation.LayoutTransition; 20import android.content.Context; 21import android.content.res.Configuration; 22import android.content.res.TypedArray; 23import android.graphics.Bitmap; 24import android.graphics.Canvas; 25import android.graphics.Matrix; 26import android.graphics.Paint; 27import android.graphics.PointF; 28import android.graphics.Rect; 29import android.graphics.RectF; 30import android.graphics.Region; 31import android.os.Build; 32import android.os.Parcelable; 33import android.os.SystemClock; 34import android.util.AttributeSet; 35import android.util.Log; 36import android.util.SparseArray; 37import android.view.accessibility.AccessibilityEvent; 38import android.view.accessibility.AccessibilityNodeInfo; 39import android.view.animation.AlphaAnimation; 40import android.view.animation.Animation; 41import android.view.animation.AnimationUtils; 42import android.view.animation.LayoutAnimationController; 43import android.view.animation.Transformation; 44 45import com.android.internal.R; 46import com.android.internal.util.Predicate; 47 48import java.util.ArrayList; 49import java.util.HashSet; 50 51/** 52 * <p> 53 * A <code>ViewGroup</code> is a special view that can contain other views 54 * (called children.) The view group is the base class for layouts and views 55 * containers. This class also defines the 56 * {@link android.view.ViewGroup.LayoutParams} class which serves as the base 57 * class for layouts parameters. 58 * </p> 59 * 60 * <p> 61 * Also see {@link LayoutParams} for layout attributes. 62 * </p> 63 * 64 * @attr ref android.R.styleable#ViewGroup_clipChildren 65 * @attr ref android.R.styleable#ViewGroup_clipToPadding 66 * @attr ref android.R.styleable#ViewGroup_layoutAnimation 67 * @attr ref android.R.styleable#ViewGroup_animationCache 68 * @attr ref android.R.styleable#ViewGroup_persistentDrawingCache 69 * @attr ref android.R.styleable#ViewGroup_alwaysDrawnWithCache 70 * @attr ref android.R.styleable#ViewGroup_addStatesFromChildren 71 * @attr ref android.R.styleable#ViewGroup_descendantFocusability 72 * @attr ref android.R.styleable#ViewGroup_animateLayoutChanges 73 */ 74public abstract class ViewGroup extends View implements ViewParent, ViewManager { 75 76 private static final boolean DBG = false; 77 78 /** 79 * Views which have been hidden or removed which need to be animated on 80 * their way out. 81 * This field should be made private, so it is hidden from the SDK. 82 * {@hide} 83 */ 84 protected ArrayList<View> mDisappearingChildren; 85 86 /** 87 * Listener used to propagate events indicating when children are added 88 * and/or removed from a view group. 89 * This field should be made private, so it is hidden from the SDK. 90 * {@hide} 91 */ 92 protected OnHierarchyChangeListener mOnHierarchyChangeListener; 93 94 // The view contained within this ViewGroup that has or contains focus. 95 private View mFocused; 96 97 /** 98 * A Transformation used when drawing children, to 99 * apply on the child being drawn. 100 */ 101 private final Transformation mChildTransformation = new Transformation(); 102 103 /** 104 * Used to track the current invalidation region. 105 */ 106 private RectF mInvalidateRegion; 107 108 /** 109 * A Transformation used to calculate a correct 110 * invalidation area when the application is autoscaled. 111 */ 112 private Transformation mInvalidationTransformation; 113 114 // View currently under an ongoing drag 115 private View mCurrentDragView; 116 117 // Metadata about the ongoing drag 118 private DragEvent mCurrentDrag; 119 private HashSet<View> mDragNotifiedChildren; 120 121 // Does this group have a child that can accept the current drag payload? 122 private boolean mChildAcceptsDrag; 123 124 // Used during drag dispatch 125 private final PointF mLocalPoint = new PointF(); 126 127 // Layout animation 128 private LayoutAnimationController mLayoutAnimationController; 129 private Animation.AnimationListener mAnimationListener; 130 131 // First touch target in the linked list of touch targets. 132 private TouchTarget mFirstTouchTarget; 133 134 // For debugging only. You can see these in hierarchyviewer. 135 @SuppressWarnings({"FieldCanBeLocal", "UnusedDeclaration"}) 136 @ViewDebug.ExportedProperty(category = "events") 137 private long mLastTouchDownTime; 138 @ViewDebug.ExportedProperty(category = "events") 139 private int mLastTouchDownIndex = -1; 140 @SuppressWarnings({"FieldCanBeLocal", "UnusedDeclaration"}) 141 @ViewDebug.ExportedProperty(category = "events") 142 private float mLastTouchDownX; 143 @SuppressWarnings({"FieldCanBeLocal", "UnusedDeclaration"}) 144 @ViewDebug.ExportedProperty(category = "events") 145 private float mLastTouchDownY; 146 147 // First hover target in the linked list of hover targets. 148 // The hover targets are children which have received ACTION_HOVER_ENTER. 149 // They might not have actually handled the hover event, but we will 150 // continue sending hover events to them as long as the pointer remains over 151 // their bounds and the view group does not intercept hover. 152 private HoverTarget mFirstHoverTarget; 153 154 // True if the view group itself received a hover event. 155 // It might not have actually handled the hover event. 156 private boolean mHoveredSelf; 157 158 /** 159 * Internal flags. 160 * 161 * This field should be made private, so it is hidden from the SDK. 162 * {@hide} 163 */ 164 protected int mGroupFlags; 165 166 // When set, ViewGroup invalidates only the child's rectangle 167 // Set by default 168 private static final int FLAG_CLIP_CHILDREN = 0x1; 169 170 // When set, ViewGroup excludes the padding area from the invalidate rectangle 171 // Set by default 172 private static final int FLAG_CLIP_TO_PADDING = 0x2; 173 174 // When set, dispatchDraw() will invoke invalidate(); this is set by drawChild() when 175 // a child needs to be invalidated and FLAG_OPTIMIZE_INVALIDATE is set 176 private static final int FLAG_INVALIDATE_REQUIRED = 0x4; 177 178 // When set, dispatchDraw() will run the layout animation and unset the flag 179 private static final int FLAG_RUN_ANIMATION = 0x8; 180 181 // When set, there is either no layout animation on the ViewGroup or the layout 182 // animation is over 183 // Set by default 184 private static final int FLAG_ANIMATION_DONE = 0x10; 185 186 // If set, this ViewGroup has padding; if unset there is no padding and we don't need 187 // to clip it, even if FLAG_CLIP_TO_PADDING is set 188 private static final int FLAG_PADDING_NOT_NULL = 0x20; 189 190 // When set, this ViewGroup caches its children in a Bitmap before starting a layout animation 191 // Set by default 192 private static final int FLAG_ANIMATION_CACHE = 0x40; 193 194 // When set, this ViewGroup converts calls to invalidate(Rect) to invalidate() during a 195 // layout animation; this avoid clobbering the hierarchy 196 // Automatically set when the layout animation starts, depending on the animation's 197 // characteristics 198 private static final int FLAG_OPTIMIZE_INVALIDATE = 0x80; 199 200 // When set, the next call to drawChild() will clear mChildTransformation's matrix 201 private static final int FLAG_CLEAR_TRANSFORMATION = 0x100; 202 203 // When set, this ViewGroup invokes mAnimationListener.onAnimationEnd() and removes 204 // the children's Bitmap caches if necessary 205 // This flag is set when the layout animation is over (after FLAG_ANIMATION_DONE is set) 206 private static final int FLAG_NOTIFY_ANIMATION_LISTENER = 0x200; 207 208 /** 209 * When set, the drawing method will call {@link #getChildDrawingOrder(int, int)} 210 * to get the index of the child to draw for that iteration. 211 * 212 * @hide 213 */ 214 protected static final int FLAG_USE_CHILD_DRAWING_ORDER = 0x400; 215 216 /** 217 * When set, this ViewGroup supports static transformations on children; this causes 218 * {@link #getChildStaticTransformation(View, android.view.animation.Transformation)} to be 219 * invoked when a child is drawn. 220 * 221 * Any subclass overriding 222 * {@link #getChildStaticTransformation(View, android.view.animation.Transformation)} should 223 * set this flags in {@link #mGroupFlags}. 224 * 225 * {@hide} 226 */ 227 protected static final int FLAG_SUPPORT_STATIC_TRANSFORMATIONS = 0x800; 228 229 // When the previous drawChild() invocation used an alpha value that was lower than 230 // 1.0 and set it in mCachePaint 231 private static final int FLAG_ALPHA_LOWER_THAN_ONE = 0x1000; 232 233 /** 234 * When set, this ViewGroup's drawable states also include those 235 * of its children. 236 */ 237 private static final int FLAG_ADD_STATES_FROM_CHILDREN = 0x2000; 238 239 /** 240 * When set, this ViewGroup tries to always draw its children using their drawing cache. 241 */ 242 private static final int FLAG_ALWAYS_DRAWN_WITH_CACHE = 0x4000; 243 244 /** 245 * When set, and if FLAG_ALWAYS_DRAWN_WITH_CACHE is not set, this ViewGroup will try to 246 * draw its children with their drawing cache. 247 */ 248 private static final int FLAG_CHILDREN_DRAWN_WITH_CACHE = 0x8000; 249 250 /** 251 * When set, this group will go through its list of children to notify them of 252 * any drawable state change. 253 */ 254 private static final int FLAG_NOTIFY_CHILDREN_ON_DRAWABLE_STATE_CHANGE = 0x10000; 255 256 private static final int FLAG_MASK_FOCUSABILITY = 0x60000; 257 258 /** 259 * This view will get focus before any of its descendants. 260 */ 261 public static final int FOCUS_BEFORE_DESCENDANTS = 0x20000; 262 263 /** 264 * This view will get focus only if none of its descendants want it. 265 */ 266 public static final int FOCUS_AFTER_DESCENDANTS = 0x40000; 267 268 /** 269 * This view will block any of its descendants from getting focus, even 270 * if they are focusable. 271 */ 272 public static final int FOCUS_BLOCK_DESCENDANTS = 0x60000; 273 274 /** 275 * Used to map between enum in attrubutes and flag values. 276 */ 277 private static final int[] DESCENDANT_FOCUSABILITY_FLAGS = 278 {FOCUS_BEFORE_DESCENDANTS, FOCUS_AFTER_DESCENDANTS, 279 FOCUS_BLOCK_DESCENDANTS}; 280 281 /** 282 * When set, this ViewGroup should not intercept touch events. 283 * {@hide} 284 */ 285 protected static final int FLAG_DISALLOW_INTERCEPT = 0x80000; 286 287 /** 288 * When set, this ViewGroup will split MotionEvents to multiple child Views when appropriate. 289 */ 290 private static final int FLAG_SPLIT_MOTION_EVENTS = 0x200000; 291 292 /** 293 * Indicates which types of drawing caches are to be kept in memory. 294 * This field should be made private, so it is hidden from the SDK. 295 * {@hide} 296 */ 297 protected int mPersistentDrawingCache; 298 299 /** 300 * Used to indicate that no drawing cache should be kept in memory. 301 */ 302 public static final int PERSISTENT_NO_CACHE = 0x0; 303 304 /** 305 * Used to indicate that the animation drawing cache should be kept in memory. 306 */ 307 public static final int PERSISTENT_ANIMATION_CACHE = 0x1; 308 309 /** 310 * Used to indicate that the scrolling drawing cache should be kept in memory. 311 */ 312 public static final int PERSISTENT_SCROLLING_CACHE = 0x2; 313 314 /** 315 * Used to indicate that all drawing caches should be kept in memory. 316 */ 317 public static final int PERSISTENT_ALL_CACHES = 0x3; 318 319 /** 320 * We clip to padding when FLAG_CLIP_TO_PADDING and FLAG_PADDING_NOT_NULL 321 * are set at the same time. 322 */ 323 protected static final int CLIP_TO_PADDING_MASK = FLAG_CLIP_TO_PADDING | FLAG_PADDING_NOT_NULL; 324 325 // Index of the child's left position in the mLocation array 326 private static final int CHILD_LEFT_INDEX = 0; 327 // Index of the child's top position in the mLocation array 328 private static final int CHILD_TOP_INDEX = 1; 329 330 // Child views of this ViewGroup 331 private View[] mChildren; 332 // Number of valid children in the mChildren array, the rest should be null or not 333 // considered as children 334 335 private boolean mLayoutSuppressed = false; 336 337 private int mChildrenCount; 338 339 private static final int ARRAY_INITIAL_CAPACITY = 12; 340 private static final int ARRAY_CAPACITY_INCREMENT = 12; 341 342 // Used to draw cached views 343 private final Paint mCachePaint = new Paint(); 344 345 // Used to animate add/remove changes in layout 346 private LayoutTransition mTransition; 347 348 // The set of views that are currently being transitioned. This list is used to track views 349 // being removed that should not actually be removed from the parent yet because they are 350 // being animated. 351 private ArrayList<View> mTransitioningViews; 352 353 // List of children changing visibility. This is used to potentially keep rendering 354 // views during a transition when they otherwise would have become gone/invisible 355 private ArrayList<View> mVisibilityChangingChildren; 356 357 // Indicates whether this container will use its children layers to draw 358 @ViewDebug.ExportedProperty(category = "drawing") 359 private boolean mDrawLayers = true; 360 361 public ViewGroup(Context context) { 362 super(context); 363 initViewGroup(); 364 } 365 366 public ViewGroup(Context context, AttributeSet attrs) { 367 super(context, attrs); 368 initViewGroup(); 369 initFromAttributes(context, attrs); 370 } 371 372 public ViewGroup(Context context, AttributeSet attrs, int defStyle) { 373 super(context, attrs, defStyle); 374 initViewGroup(); 375 initFromAttributes(context, attrs); 376 } 377 378 private void initViewGroup() { 379 // ViewGroup doesn't draw by default 380 setFlags(WILL_NOT_DRAW, DRAW_MASK); 381 mGroupFlags |= FLAG_CLIP_CHILDREN; 382 mGroupFlags |= FLAG_CLIP_TO_PADDING; 383 mGroupFlags |= FLAG_ANIMATION_DONE; 384 mGroupFlags |= FLAG_ANIMATION_CACHE; 385 mGroupFlags |= FLAG_ALWAYS_DRAWN_WITH_CACHE; 386 387 if (mContext.getApplicationInfo().targetSdkVersion >= Build.VERSION_CODES.HONEYCOMB) { 388 mGroupFlags |= FLAG_SPLIT_MOTION_EVENTS; 389 } 390 391 setDescendantFocusability(FOCUS_BEFORE_DESCENDANTS); 392 393 mChildren = new View[ARRAY_INITIAL_CAPACITY]; 394 mChildrenCount = 0; 395 396 mCachePaint.setDither(false); 397 398 mPersistentDrawingCache = PERSISTENT_SCROLLING_CACHE; 399 } 400 401 private void initFromAttributes(Context context, AttributeSet attrs) { 402 TypedArray a = context.obtainStyledAttributes(attrs, 403 R.styleable.ViewGroup); 404 405 final int N = a.getIndexCount(); 406 for (int i = 0; i < N; i++) { 407 int attr = a.getIndex(i); 408 switch (attr) { 409 case R.styleable.ViewGroup_clipChildren: 410 setClipChildren(a.getBoolean(attr, true)); 411 break; 412 case R.styleable.ViewGroup_clipToPadding: 413 setClipToPadding(a.getBoolean(attr, true)); 414 break; 415 case R.styleable.ViewGroup_animationCache: 416 setAnimationCacheEnabled(a.getBoolean(attr, true)); 417 break; 418 case R.styleable.ViewGroup_persistentDrawingCache: 419 setPersistentDrawingCache(a.getInt(attr, PERSISTENT_SCROLLING_CACHE)); 420 break; 421 case R.styleable.ViewGroup_addStatesFromChildren: 422 setAddStatesFromChildren(a.getBoolean(attr, false)); 423 break; 424 case R.styleable.ViewGroup_alwaysDrawnWithCache: 425 setAlwaysDrawnWithCacheEnabled(a.getBoolean(attr, true)); 426 break; 427 case R.styleable.ViewGroup_layoutAnimation: 428 int id = a.getResourceId(attr, -1); 429 if (id > 0) { 430 setLayoutAnimation(AnimationUtils.loadLayoutAnimation(mContext, id)); 431 } 432 break; 433 case R.styleable.ViewGroup_descendantFocusability: 434 setDescendantFocusability(DESCENDANT_FOCUSABILITY_FLAGS[a.getInt(attr, 0)]); 435 break; 436 case R.styleable.ViewGroup_splitMotionEvents: 437 setMotionEventSplittingEnabled(a.getBoolean(attr, false)); 438 break; 439 case R.styleable.ViewGroup_animateLayoutChanges: 440 boolean animateLayoutChanges = a.getBoolean(attr, false); 441 if (animateLayoutChanges) { 442 setLayoutTransition(new LayoutTransition()); 443 } 444 break; 445 } 446 } 447 448 a.recycle(); 449 } 450 451 /** 452 * Gets the descendant focusability of this view group. The descendant 453 * focusability defines the relationship between this view group and its 454 * descendants when looking for a view to take focus in 455 * {@link #requestFocus(int, android.graphics.Rect)}. 456 * 457 * @return one of {@link #FOCUS_BEFORE_DESCENDANTS}, {@link #FOCUS_AFTER_DESCENDANTS}, 458 * {@link #FOCUS_BLOCK_DESCENDANTS}. 459 */ 460 @ViewDebug.ExportedProperty(category = "focus", mapping = { 461 @ViewDebug.IntToString(from = FOCUS_BEFORE_DESCENDANTS, to = "FOCUS_BEFORE_DESCENDANTS"), 462 @ViewDebug.IntToString(from = FOCUS_AFTER_DESCENDANTS, to = "FOCUS_AFTER_DESCENDANTS"), 463 @ViewDebug.IntToString(from = FOCUS_BLOCK_DESCENDANTS, to = "FOCUS_BLOCK_DESCENDANTS") 464 }) 465 public int getDescendantFocusability() { 466 return mGroupFlags & FLAG_MASK_FOCUSABILITY; 467 } 468 469 /** 470 * Set the descendant focusability of this view group. This defines the relationship 471 * between this view group and its descendants when looking for a view to 472 * take focus in {@link #requestFocus(int, android.graphics.Rect)}. 473 * 474 * @param focusability one of {@link #FOCUS_BEFORE_DESCENDANTS}, {@link #FOCUS_AFTER_DESCENDANTS}, 475 * {@link #FOCUS_BLOCK_DESCENDANTS}. 476 */ 477 public void setDescendantFocusability(int focusability) { 478 switch (focusability) { 479 case FOCUS_BEFORE_DESCENDANTS: 480 case FOCUS_AFTER_DESCENDANTS: 481 case FOCUS_BLOCK_DESCENDANTS: 482 break; 483 default: 484 throw new IllegalArgumentException("must be one of FOCUS_BEFORE_DESCENDANTS, " 485 + "FOCUS_AFTER_DESCENDANTS, FOCUS_BLOCK_DESCENDANTS"); 486 } 487 mGroupFlags &= ~FLAG_MASK_FOCUSABILITY; 488 mGroupFlags |= (focusability & FLAG_MASK_FOCUSABILITY); 489 } 490 491 /** 492 * {@inheritDoc} 493 */ 494 @Override 495 void handleFocusGainInternal(int direction, Rect previouslyFocusedRect) { 496 if (mFocused != null) { 497 mFocused.unFocus(); 498 mFocused = null; 499 } 500 super.handleFocusGainInternal(direction, previouslyFocusedRect); 501 } 502 503 /** 504 * {@inheritDoc} 505 */ 506 public void requestChildFocus(View child, View focused) { 507 if (DBG) { 508 System.out.println(this + " requestChildFocus()"); 509 } 510 if (getDescendantFocusability() == FOCUS_BLOCK_DESCENDANTS) { 511 return; 512 } 513 514 // Unfocus us, if necessary 515 super.unFocus(); 516 517 // We had a previous notion of who had focus. Clear it. 518 if (mFocused != child) { 519 if (mFocused != null) { 520 mFocused.unFocus(); 521 } 522 523 mFocused = child; 524 } 525 if (mParent != null) { 526 mParent.requestChildFocus(this, focused); 527 } 528 } 529 530 /** 531 * {@inheritDoc} 532 */ 533 public void focusableViewAvailable(View v) { 534 if (mParent != null 535 // shortcut: don't report a new focusable view if we block our descendants from 536 // getting focus 537 && (getDescendantFocusability() != FOCUS_BLOCK_DESCENDANTS) 538 // shortcut: don't report a new focusable view if we already are focused 539 // (and we don't prefer our descendants) 540 // 541 // note: knowing that mFocused is non-null is not a good enough reason 542 // to break the traversal since in that case we'd actually have to find 543 // the focused view and make sure it wasn't FOCUS_AFTER_DESCENDANTS and 544 // an ancestor of v; this will get checked for at ViewAncestor 545 && !(isFocused() && getDescendantFocusability() != FOCUS_AFTER_DESCENDANTS)) { 546 mParent.focusableViewAvailable(v); 547 } 548 } 549 550 /** 551 * {@inheritDoc} 552 */ 553 public boolean showContextMenuForChild(View originalView) { 554 return mParent != null && mParent.showContextMenuForChild(originalView); 555 } 556 557 /** 558 * {@inheritDoc} 559 */ 560 public ActionMode startActionModeForChild(View originalView, ActionMode.Callback callback) { 561 return mParent != null ? mParent.startActionModeForChild(originalView, callback) : null; 562 } 563 564 /** 565 * Find the nearest view in the specified direction that wants to take 566 * focus. 567 * 568 * @param focused The view that currently has focus 569 * @param direction One of FOCUS_UP, FOCUS_DOWN, FOCUS_LEFT, and 570 * FOCUS_RIGHT, or 0 for not applicable. 571 */ 572 public View focusSearch(View focused, int direction) { 573 if (isRootNamespace()) { 574 // root namespace means we should consider ourselves the top of the 575 // tree for focus searching; otherwise we could be focus searching 576 // into other tabs. see LocalActivityManager and TabHost for more info 577 return FocusFinder.getInstance().findNextFocus(this, focused, direction); 578 } else if (mParent != null) { 579 return mParent.focusSearch(focused, direction); 580 } 581 return null; 582 } 583 584 /** 585 * {@inheritDoc} 586 */ 587 public boolean requestChildRectangleOnScreen(View child, Rect rectangle, boolean immediate) { 588 return false; 589 } 590 591 /** 592 * {@inheritDoc} 593 */ 594 public boolean requestSendAccessibilityEvent(View child, AccessibilityEvent event) { 595 ViewParent parent = getParent(); 596 if (parent == null) { 597 return false; 598 } 599 final boolean propagate = onRequestSendAccessibilityEvent(child, event); 600 //noinspection SimplifiableIfStatement 601 if (!propagate) { 602 return false; 603 } 604 return parent.requestSendAccessibilityEvent(this, event); 605 } 606 607 /** 608 * Called when a child has requested sending an {@link AccessibilityEvent} and 609 * gives an opportunity to its parent to augment the event. 610 * 611 * @param child The child which requests sending the event. 612 * @param event The event to be sent. 613 * @return True if the event should be sent. 614 * 615 * @see #requestSendAccessibilityEvent(View, AccessibilityEvent) 616 */ 617 public boolean onRequestSendAccessibilityEvent(View child, AccessibilityEvent event) { 618 return true; 619 } 620 621 /** 622 * {@inheritDoc} 623 */ 624 @Override 625 public boolean dispatchUnhandledMove(View focused, int direction) { 626 return mFocused != null && 627 mFocused.dispatchUnhandledMove(focused, direction); 628 } 629 630 /** 631 * {@inheritDoc} 632 */ 633 public void clearChildFocus(View child) { 634 if (DBG) { 635 System.out.println(this + " clearChildFocus()"); 636 } 637 638 mFocused = null; 639 if (mParent != null) { 640 mParent.clearChildFocus(this); 641 } 642 } 643 644 /** 645 * {@inheritDoc} 646 */ 647 @Override 648 public void clearFocus() { 649 super.clearFocus(); 650 651 // clear any child focus if it exists 652 if (mFocused != null) { 653 mFocused.clearFocus(); 654 } 655 } 656 657 /** 658 * {@inheritDoc} 659 */ 660 @Override 661 void unFocus() { 662 if (DBG) { 663 System.out.println(this + " unFocus()"); 664 } 665 666 super.unFocus(); 667 if (mFocused != null) { 668 mFocused.unFocus(); 669 } 670 mFocused = null; 671 } 672 673 /** 674 * Returns the focused child of this view, if any. The child may have focus 675 * or contain focus. 676 * 677 * @return the focused child or null. 678 */ 679 public View getFocusedChild() { 680 return mFocused; 681 } 682 683 /** 684 * Returns true if this view has or contains focus 685 * 686 * @return true if this view has or contains focus 687 */ 688 @Override 689 public boolean hasFocus() { 690 return (mPrivateFlags & FOCUSED) != 0 || mFocused != null; 691 } 692 693 /* 694 * (non-Javadoc) 695 * 696 * @see android.view.View#findFocus() 697 */ 698 @Override 699 public View findFocus() { 700 if (DBG) { 701 System.out.println("Find focus in " + this + ": flags=" 702 + isFocused() + ", child=" + mFocused); 703 } 704 705 if (isFocused()) { 706 return this; 707 } 708 709 if (mFocused != null) { 710 return mFocused.findFocus(); 711 } 712 return null; 713 } 714 715 /** 716 * {@inheritDoc} 717 */ 718 @Override 719 public boolean hasFocusable() { 720 if ((mViewFlags & VISIBILITY_MASK) != VISIBLE) { 721 return false; 722 } 723 724 if (isFocusable()) { 725 return true; 726 } 727 728 final int descendantFocusability = getDescendantFocusability(); 729 if (descendantFocusability != FOCUS_BLOCK_DESCENDANTS) { 730 final int count = mChildrenCount; 731 final View[] children = mChildren; 732 733 for (int i = 0; i < count; i++) { 734 final View child = children[i]; 735 if (child.hasFocusable()) { 736 return true; 737 } 738 } 739 } 740 741 return false; 742 } 743 744 /** 745 * {@inheritDoc} 746 */ 747 @Override 748 public void addFocusables(ArrayList<View> views, int direction) { 749 addFocusables(views, direction, FOCUSABLES_TOUCH_MODE); 750 } 751 752 /** 753 * {@inheritDoc} 754 */ 755 @Override 756 public void addFocusables(ArrayList<View> views, int direction, int focusableMode) { 757 final int focusableCount = views.size(); 758 759 final int descendantFocusability = getDescendantFocusability(); 760 761 if (descendantFocusability != FOCUS_BLOCK_DESCENDANTS) { 762 final int count = mChildrenCount; 763 final View[] children = mChildren; 764 765 for (int i = 0; i < count; i++) { 766 final View child = children[i]; 767 if ((child.mViewFlags & VISIBILITY_MASK) == VISIBLE) { 768 child.addFocusables(views, direction, focusableMode); 769 } 770 } 771 } 772 773 // we add ourselves (if focusable) in all cases except for when we are 774 // FOCUS_AFTER_DESCENDANTS and there are some descendants focusable. this is 775 // to avoid the focus search finding layouts when a more precise search 776 // among the focusable children would be more interesting. 777 if ( 778 descendantFocusability != FOCUS_AFTER_DESCENDANTS || 779 // No focusable descendants 780 (focusableCount == views.size())) { 781 super.addFocusables(views, direction, focusableMode); 782 } 783 } 784 785 @Override 786 public void findViewsWithText(ArrayList<View> outViews, CharSequence text) { 787 final int childrenCount = mChildrenCount; 788 final View[] children = mChildren; 789 for (int i = 0; i < childrenCount; i++) { 790 View child = children[i]; 791 if ((child.mViewFlags & VISIBILITY_MASK) == VISIBLE) { 792 child.findViewsWithText(outViews, text); 793 } 794 } 795 } 796 797 /** 798 * {@inheritDoc} 799 */ 800 @Override 801 public void dispatchWindowFocusChanged(boolean hasFocus) { 802 super.dispatchWindowFocusChanged(hasFocus); 803 final int count = mChildrenCount; 804 final View[] children = mChildren; 805 for (int i = 0; i < count; i++) { 806 children[i].dispatchWindowFocusChanged(hasFocus); 807 } 808 } 809 810 /** 811 * {@inheritDoc} 812 */ 813 @Override 814 public void addTouchables(ArrayList<View> views) { 815 super.addTouchables(views); 816 817 final int count = mChildrenCount; 818 final View[] children = mChildren; 819 820 for (int i = 0; i < count; i++) { 821 final View child = children[i]; 822 if ((child.mViewFlags & VISIBILITY_MASK) == VISIBLE) { 823 child.addTouchables(views); 824 } 825 } 826 } 827 828 /** 829 * {@inheritDoc} 830 */ 831 @Override 832 public void dispatchDisplayHint(int hint) { 833 super.dispatchDisplayHint(hint); 834 final int count = mChildrenCount; 835 final View[] children = mChildren; 836 for (int i = 0; i < count; i++) { 837 children[i].dispatchDisplayHint(hint); 838 } 839 } 840 841 /** 842 * @hide 843 * @param child 844 * @param visibility 845 */ 846 void onChildVisibilityChanged(View child, int visibility) { 847 if (mTransition != null) { 848 if (visibility == VISIBLE) { 849 mTransition.showChild(this, child); 850 } else { 851 mTransition.hideChild(this, child); 852 } 853 if (visibility != VISIBLE) { 854 // Only track this on disappearing views - appearing views are already visible 855 // and don't need special handling during drawChild() 856 if (mVisibilityChangingChildren == null) { 857 mVisibilityChangingChildren = new ArrayList<View>(); 858 } 859 mVisibilityChangingChildren.add(child); 860 if (mTransitioningViews != null && mTransitioningViews.contains(child)) { 861 addDisappearingView(child); 862 } 863 } 864 } 865 866 // in all cases, for drags 867 if (mCurrentDrag != null) { 868 if (visibility == VISIBLE) { 869 notifyChildOfDrag(child); 870 } 871 } 872 } 873 874 /** 875 * {@inheritDoc} 876 */ 877 @Override 878 protected void dispatchVisibilityChanged(View changedView, int visibility) { 879 super.dispatchVisibilityChanged(changedView, visibility); 880 final int count = mChildrenCount; 881 final View[] children = mChildren; 882 for (int i = 0; i < count; i++) { 883 children[i].dispatchVisibilityChanged(changedView, visibility); 884 } 885 } 886 887 /** 888 * {@inheritDoc} 889 */ 890 @Override 891 public void dispatchWindowVisibilityChanged(int visibility) { 892 super.dispatchWindowVisibilityChanged(visibility); 893 final int count = mChildrenCount; 894 final View[] children = mChildren; 895 for (int i = 0; i < count; i++) { 896 children[i].dispatchWindowVisibilityChanged(visibility); 897 } 898 } 899 900 /** 901 * {@inheritDoc} 902 */ 903 @Override 904 public void dispatchConfigurationChanged(Configuration newConfig) { 905 super.dispatchConfigurationChanged(newConfig); 906 final int count = mChildrenCount; 907 final View[] children = mChildren; 908 for (int i = 0; i < count; i++) { 909 children[i].dispatchConfigurationChanged(newConfig); 910 } 911 } 912 913 /** 914 * {@inheritDoc} 915 */ 916 public void recomputeViewAttributes(View child) { 917 if (mAttachInfo != null && !mAttachInfo.mRecomputeGlobalAttributes) { 918 ViewParent parent = mParent; 919 if (parent != null) parent.recomputeViewAttributes(this); 920 } 921 } 922 923 @Override 924 void dispatchCollectViewAttributes(int visibility) { 925 visibility |= mViewFlags&VISIBILITY_MASK; 926 super.dispatchCollectViewAttributes(visibility); 927 final int count = mChildrenCount; 928 final View[] children = mChildren; 929 for (int i = 0; i < count; i++) { 930 children[i].dispatchCollectViewAttributes(visibility); 931 } 932 } 933 934 /** 935 * {@inheritDoc} 936 */ 937 public void bringChildToFront(View child) { 938 int index = indexOfChild(child); 939 if (index >= 0) { 940 removeFromArray(index); 941 addInArray(child, mChildrenCount); 942 child.mParent = this; 943 } 944 } 945 946 /** 947 * {@inheritDoc} 948 * 949 * !!! TODO: write real docs 950 */ 951 @Override 952 public boolean dispatchDragEvent(DragEvent event) { 953 boolean retval = false; 954 final float tx = event.mX; 955 final float ty = event.mY; 956 957 ViewRootImpl root = getViewRootImpl(); 958 959 // Dispatch down the view hierarchy 960 switch (event.mAction) { 961 case DragEvent.ACTION_DRAG_STARTED: { 962 // clear state to recalculate which views we drag over 963 mCurrentDragView = null; 964 965 // Set up our tracking of drag-started notifications 966 mCurrentDrag = DragEvent.obtain(event); 967 if (mDragNotifiedChildren == null) { 968 mDragNotifiedChildren = new HashSet<View>(); 969 } else { 970 mDragNotifiedChildren.clear(); 971 } 972 973 // Now dispatch down to our children, caching the responses 974 mChildAcceptsDrag = false; 975 final int count = mChildrenCount; 976 final View[] children = mChildren; 977 for (int i = 0; i < count; i++) { 978 final View child = children[i]; 979 child.mPrivateFlags2 &= ~View.DRAG_MASK; 980 if (child.getVisibility() == VISIBLE) { 981 final boolean handled = notifyChildOfDrag(children[i]); 982 if (handled) { 983 mChildAcceptsDrag = true; 984 } 985 } 986 } 987 988 // Return HANDLED if one of our children can accept the drag 989 if (mChildAcceptsDrag) { 990 retval = true; 991 } 992 } break; 993 994 case DragEvent.ACTION_DRAG_ENDED: { 995 // Release the bookkeeping now that the drag lifecycle has ended 996 if (mDragNotifiedChildren != null) { 997 for (View child : mDragNotifiedChildren) { 998 // If a child was notified about an ongoing drag, it's told that it's over 999 child.dispatchDragEvent(event); 1000 child.mPrivateFlags2 &= ~View.DRAG_MASK; 1001 child.refreshDrawableState(); 1002 } 1003 1004 mDragNotifiedChildren.clear(); 1005 mCurrentDrag.recycle(); 1006 mCurrentDrag = null; 1007 } 1008 1009 // We consider drag-ended to have been handled if one of our children 1010 // had offered to handle the drag. 1011 if (mChildAcceptsDrag) { 1012 retval = true; 1013 } 1014 } break; 1015 1016 case DragEvent.ACTION_DRAG_LOCATION: { 1017 // Find the [possibly new] drag target 1018 final View target = findFrontmostDroppableChildAt(event.mX, event.mY, mLocalPoint); 1019 1020 // If we've changed apparent drag target, tell the view root which view 1021 // we're over now [for purposes of the eventual drag-recipient-changed 1022 // notifications to the framework] and tell the new target that the drag 1023 // has entered its bounds. The root will see setDragFocus() calls all 1024 // the way down to the final leaf view that is handling the LOCATION event 1025 // before reporting the new potential recipient to the framework. 1026 if (mCurrentDragView != target) { 1027 root.setDragFocus(target); 1028 1029 final int action = event.mAction; 1030 // If we've dragged off of a child view, send it the EXITED message 1031 if (mCurrentDragView != null) { 1032 final View view = mCurrentDragView; 1033 event.mAction = DragEvent.ACTION_DRAG_EXITED; 1034 view.dispatchDragEvent(event); 1035 view.mPrivateFlags2 &= ~View.DRAG_HOVERED; 1036 view.refreshDrawableState(); 1037 } 1038 mCurrentDragView = target; 1039 1040 // If we've dragged over a new child view, send it the ENTERED message 1041 if (target != null) { 1042 event.mAction = DragEvent.ACTION_DRAG_ENTERED; 1043 target.dispatchDragEvent(event); 1044 target.mPrivateFlags2 |= View.DRAG_HOVERED; 1045 target.refreshDrawableState(); 1046 } 1047 event.mAction = action; // restore the event's original state 1048 } 1049 1050 // Dispatch the actual drag location notice, localized into its coordinates 1051 if (target != null) { 1052 event.mX = mLocalPoint.x; 1053 event.mY = mLocalPoint.y; 1054 1055 retval = target.dispatchDragEvent(event); 1056 1057 event.mX = tx; 1058 event.mY = ty; 1059 } 1060 } break; 1061 1062 /* Entered / exited dispatch 1063 * 1064 * DRAG_ENTERED is not dispatched downwards from ViewGroup. The reason for this is 1065 * that we're about to get the corresponding LOCATION event, which we will use to 1066 * determine which of our children is the new target; at that point we will 1067 * push a DRAG_ENTERED down to the new target child [which may itself be a ViewGroup]. 1068 * 1069 * DRAG_EXITED *is* dispatched all the way down immediately: once we know the 1070 * drag has left this ViewGroup, we know by definition that every contained subview 1071 * is also no longer under the drag point. 1072 */ 1073 1074 case DragEvent.ACTION_DRAG_EXITED: { 1075 if (mCurrentDragView != null) { 1076 final View view = mCurrentDragView; 1077 view.dispatchDragEvent(event); 1078 view.mPrivateFlags2 &= ~View.DRAG_HOVERED; 1079 view.refreshDrawableState(); 1080 1081 mCurrentDragView = null; 1082 } 1083 } break; 1084 1085 case DragEvent.ACTION_DROP: { 1086 if (ViewDebug.DEBUG_DRAG) Log.d(View.VIEW_LOG_TAG, "Drop event: " + event); 1087 View target = findFrontmostDroppableChildAt(event.mX, event.mY, mLocalPoint); 1088 if (target != null) { 1089 if (ViewDebug.DEBUG_DRAG) Log.d(View.VIEW_LOG_TAG, " dispatch drop to " + target); 1090 event.mX = mLocalPoint.x; 1091 event.mY = mLocalPoint.y; 1092 retval = target.dispatchDragEvent(event); 1093 event.mX = tx; 1094 event.mY = ty; 1095 } else { 1096 if (ViewDebug.DEBUG_DRAG) { 1097 Log.d(View.VIEW_LOG_TAG, " not dropped on an accepting view"); 1098 } 1099 } 1100 } break; 1101 } 1102 1103 // If none of our children could handle the event, try here 1104 if (!retval) { 1105 // Call up to the View implementation that dispatches to installed listeners 1106 retval = super.dispatchDragEvent(event); 1107 } 1108 return retval; 1109 } 1110 1111 // Find the frontmost child view that lies under the given point, and calculate 1112 // the position within its own local coordinate system. 1113 View findFrontmostDroppableChildAt(float x, float y, PointF outLocalPoint) { 1114 final int count = mChildrenCount; 1115 final View[] children = mChildren; 1116 for (int i = count - 1; i >= 0; i--) { 1117 final View child = children[i]; 1118 if (!child.canAcceptDrag()) { 1119 continue; 1120 } 1121 1122 if (isTransformedTouchPointInView(x, y, child, outLocalPoint)) { 1123 return child; 1124 } 1125 } 1126 return null; 1127 } 1128 1129 boolean notifyChildOfDrag(View child) { 1130 if (ViewDebug.DEBUG_DRAG) { 1131 Log.d(View.VIEW_LOG_TAG, "Sending drag-started to view: " + child); 1132 } 1133 1134 boolean canAccept = false; 1135 if (! mDragNotifiedChildren.contains(child)) { 1136 mDragNotifiedChildren.add(child); 1137 canAccept = child.dispatchDragEvent(mCurrentDrag); 1138 if (canAccept && !child.canAcceptDrag()) { 1139 child.mPrivateFlags2 |= View.DRAG_CAN_ACCEPT; 1140 child.refreshDrawableState(); 1141 } 1142 } 1143 return canAccept; 1144 } 1145 1146 @Override 1147 public void dispatchSystemUiVisibilityChanged(int visible) { 1148 super.dispatchSystemUiVisibilityChanged(visible); 1149 1150 final int count = mChildrenCount; 1151 final View[] children = mChildren; 1152 for (int i=0; i <count; i++) { 1153 final View child = children[i]; 1154 child.dispatchSystemUiVisibilityChanged(visible); 1155 } 1156 } 1157 1158 /** 1159 * {@inheritDoc} 1160 */ 1161 @Override 1162 public boolean dispatchKeyEventPreIme(KeyEvent event) { 1163 if ((mPrivateFlags & (FOCUSED | HAS_BOUNDS)) == (FOCUSED | HAS_BOUNDS)) { 1164 return super.dispatchKeyEventPreIme(event); 1165 } else if (mFocused != null && (mFocused.mPrivateFlags & HAS_BOUNDS) == HAS_BOUNDS) { 1166 return mFocused.dispatchKeyEventPreIme(event); 1167 } 1168 return false; 1169 } 1170 1171 /** 1172 * {@inheritDoc} 1173 */ 1174 @Override 1175 public boolean dispatchKeyEvent(KeyEvent event) { 1176 if (mInputEventConsistencyVerifier != null) { 1177 mInputEventConsistencyVerifier.onKeyEvent(event, 1); 1178 } 1179 1180 if ((mPrivateFlags & (FOCUSED | HAS_BOUNDS)) == (FOCUSED | HAS_BOUNDS)) { 1181 if (super.dispatchKeyEvent(event)) { 1182 return true; 1183 } 1184 } else if (mFocused != null && (mFocused.mPrivateFlags & HAS_BOUNDS) == HAS_BOUNDS) { 1185 if (mFocused.dispatchKeyEvent(event)) { 1186 return true; 1187 } 1188 } 1189 1190 if (mInputEventConsistencyVerifier != null) { 1191 mInputEventConsistencyVerifier.onUnhandledEvent(event, 1); 1192 } 1193 return false; 1194 } 1195 1196 /** 1197 * {@inheritDoc} 1198 */ 1199 @Override 1200 public boolean dispatchKeyShortcutEvent(KeyEvent event) { 1201 if ((mPrivateFlags & (FOCUSED | HAS_BOUNDS)) == (FOCUSED | HAS_BOUNDS)) { 1202 return super.dispatchKeyShortcutEvent(event); 1203 } else if (mFocused != null && (mFocused.mPrivateFlags & HAS_BOUNDS) == HAS_BOUNDS) { 1204 return mFocused.dispatchKeyShortcutEvent(event); 1205 } 1206 return false; 1207 } 1208 1209 /** 1210 * {@inheritDoc} 1211 */ 1212 @Override 1213 public boolean dispatchTrackballEvent(MotionEvent event) { 1214 if (mInputEventConsistencyVerifier != null) { 1215 mInputEventConsistencyVerifier.onTrackballEvent(event, 1); 1216 } 1217 1218 if ((mPrivateFlags & (FOCUSED | HAS_BOUNDS)) == (FOCUSED | HAS_BOUNDS)) { 1219 if (super.dispatchTrackballEvent(event)) { 1220 return true; 1221 } 1222 } else if (mFocused != null && (mFocused.mPrivateFlags & HAS_BOUNDS) == HAS_BOUNDS) { 1223 if (mFocused.dispatchTrackballEvent(event)) { 1224 return true; 1225 } 1226 } 1227 1228 if (mInputEventConsistencyVerifier != null) { 1229 mInputEventConsistencyVerifier.onUnhandledEvent(event, 1); 1230 } 1231 return false; 1232 } 1233 1234 /** 1235 * {@inheritDoc} 1236 */ 1237 @SuppressWarnings({"ConstantConditions"}) 1238 @Override 1239 protected boolean dispatchHoverEvent(MotionEvent event) { 1240 final int action = event.getAction(); 1241 1242 // First check whether the view group wants to intercept the hover event. 1243 final boolean interceptHover = onInterceptHoverEvent(event); 1244 event.setAction(action); // restore action in case it was changed 1245 1246 MotionEvent eventNoHistory = event; 1247 boolean handled = false; 1248 1249 // Send events to the hovered children and build a new list of hover targets until 1250 // one is found that handles the event. 1251 HoverTarget firstOldHoverTarget = mFirstHoverTarget; 1252 mFirstHoverTarget = null; 1253 if (!interceptHover && action != MotionEvent.ACTION_HOVER_EXIT) { 1254 final float x = event.getX(); 1255 final float y = event.getY(); 1256 final int childrenCount = mChildrenCount; 1257 if (childrenCount != 0) { 1258 final View[] children = mChildren; 1259 HoverTarget lastHoverTarget = null; 1260 for (int i = childrenCount - 1; i >= 0; i--) { 1261 final View child = children[i]; 1262 if (!canViewReceivePointerEvents(child) 1263 || !isTransformedTouchPointInView(x, y, child, null)) { 1264 continue; 1265 } 1266 1267 // Obtain a hover target for this child. Dequeue it from the 1268 // old hover target list if the child was previously hovered. 1269 HoverTarget hoverTarget = firstOldHoverTarget; 1270 final boolean wasHovered; 1271 for (HoverTarget predecessor = null; ;) { 1272 if (hoverTarget == null) { 1273 hoverTarget = HoverTarget.obtain(child); 1274 wasHovered = false; 1275 break; 1276 } 1277 1278 if (hoverTarget.child == child) { 1279 if (predecessor != null) { 1280 predecessor.next = hoverTarget.next; 1281 } else { 1282 firstOldHoverTarget = hoverTarget.next; 1283 } 1284 hoverTarget.next = null; 1285 wasHovered = true; 1286 break; 1287 } 1288 1289 predecessor = hoverTarget; 1290 hoverTarget = hoverTarget.next; 1291 } 1292 1293 // Enqueue the hover target onto the new hover target list. 1294 if (lastHoverTarget != null) { 1295 lastHoverTarget.next = hoverTarget; 1296 } else { 1297 lastHoverTarget = hoverTarget; 1298 mFirstHoverTarget = hoverTarget; 1299 } 1300 1301 // Dispatch the event to the child. 1302 if (action == MotionEvent.ACTION_HOVER_ENTER) { 1303 if (!wasHovered) { 1304 // Send the enter as is. 1305 handled |= dispatchTransformedGenericPointerEvent( 1306 event, child); // enter 1307 } 1308 } else if (action == MotionEvent.ACTION_HOVER_MOVE) { 1309 if (!wasHovered) { 1310 // Synthesize an enter from a move. 1311 eventNoHistory = obtainMotionEventNoHistoryOrSelf(eventNoHistory); 1312 eventNoHistory.setAction(MotionEvent.ACTION_HOVER_ENTER); 1313 handled |= dispatchTransformedGenericPointerEvent( 1314 eventNoHistory, child); // enter 1315 eventNoHistory.setAction(action); 1316 1317 handled |= dispatchTransformedGenericPointerEvent( 1318 eventNoHistory, child); // move 1319 } else { 1320 // Send the move as is. 1321 handled |= dispatchTransformedGenericPointerEvent(event, child); 1322 } 1323 } 1324 if (handled) { 1325 break; 1326 } 1327 } 1328 } 1329 } 1330 1331 // Send exit events to all previously hovered children that are no longer hovered. 1332 while (firstOldHoverTarget != null) { 1333 final View child = firstOldHoverTarget.child; 1334 1335 // Exit the old hovered child. 1336 if (action == MotionEvent.ACTION_HOVER_EXIT) { 1337 // Send the exit as is. 1338 handled |= dispatchTransformedGenericPointerEvent( 1339 event, child); // exit 1340 } else { 1341 // Synthesize an exit from a move or enter. 1342 // Ignore the result because hover focus has moved to a different view. 1343 if (action == MotionEvent.ACTION_HOVER_MOVE) { 1344 dispatchTransformedGenericPointerEvent( 1345 event, child); // move 1346 } 1347 eventNoHistory = obtainMotionEventNoHistoryOrSelf(eventNoHistory); 1348 eventNoHistory.setAction(MotionEvent.ACTION_HOVER_EXIT); 1349 dispatchTransformedGenericPointerEvent( 1350 eventNoHistory, child); // exit 1351 eventNoHistory.setAction(action); 1352 } 1353 1354 final HoverTarget nextOldHoverTarget = firstOldHoverTarget.next; 1355 firstOldHoverTarget.recycle(); 1356 firstOldHoverTarget = nextOldHoverTarget; 1357 } 1358 1359 // Send events to the view group itself if no children have handled it. 1360 boolean newHoveredSelf = !handled; 1361 if (newHoveredSelf == mHoveredSelf) { 1362 if (newHoveredSelf) { 1363 // Send event to the view group as before. 1364 handled |= super.dispatchHoverEvent(event); 1365 } 1366 } else { 1367 if (mHoveredSelf) { 1368 // Exit the view group. 1369 if (action == MotionEvent.ACTION_HOVER_EXIT) { 1370 // Send the exit as is. 1371 handled |= super.dispatchHoverEvent(event); // exit 1372 } else { 1373 // Synthesize an exit from a move or enter. 1374 // Ignore the result because hover focus is moving to a different view. 1375 if (action == MotionEvent.ACTION_HOVER_MOVE) { 1376 super.dispatchHoverEvent(event); // move 1377 } 1378 eventNoHistory = obtainMotionEventNoHistoryOrSelf(eventNoHistory); 1379 eventNoHistory.setAction(MotionEvent.ACTION_HOVER_EXIT); 1380 super.dispatchHoverEvent(eventNoHistory); // exit 1381 eventNoHistory.setAction(action); 1382 } 1383 mHoveredSelf = false; 1384 } 1385 1386 if (newHoveredSelf) { 1387 // Enter the view group. 1388 if (action == MotionEvent.ACTION_HOVER_ENTER) { 1389 // Send the enter as is. 1390 handled |= super.dispatchHoverEvent(event); // enter 1391 mHoveredSelf = true; 1392 } else if (action == MotionEvent.ACTION_HOVER_MOVE) { 1393 // Synthesize an enter from a move. 1394 eventNoHistory = obtainMotionEventNoHistoryOrSelf(eventNoHistory); 1395 eventNoHistory.setAction(MotionEvent.ACTION_HOVER_ENTER); 1396 handled |= super.dispatchHoverEvent(eventNoHistory); // enter 1397 eventNoHistory.setAction(action); 1398 1399 handled |= super.dispatchHoverEvent(eventNoHistory); // move 1400 mHoveredSelf = true; 1401 } 1402 } 1403 } 1404 1405 // Recycle the copy of the event that we made. 1406 if (eventNoHistory != event) { 1407 eventNoHistory.recycle(); 1408 } 1409 1410 // Done. 1411 return handled; 1412 } 1413 1414 /** @hide */ 1415 @Override 1416 protected boolean hasHoveredChild() { 1417 return mFirstHoverTarget != null; 1418 } 1419 1420 /** 1421 * Implement this method to intercept hover events before they are handled 1422 * by child views. 1423 * <p> 1424 * This method is called before dispatching a hover event to a child of 1425 * the view group or to the view group's own {@link #onHoverEvent} to allow 1426 * the view group a chance to intercept the hover event. 1427 * This method can also be used to watch all pointer motions that occur within 1428 * the bounds of the view group even when the pointer is hovering over 1429 * a child of the view group rather than over the view group itself. 1430 * </p><p> 1431 * The view group can prevent its children from receiving hover events by 1432 * implementing this method and returning <code>true</code> to indicate 1433 * that it would like to intercept hover events. The view group must 1434 * continuously return <code>true</code> from {@link #onInterceptHoverEvent} 1435 * for as long as it wishes to continue intercepting hover events from 1436 * its children. 1437 * </p><p> 1438 * Interception preserves the invariant that at most one view can be 1439 * hovered at a time by transferring hover focus from the currently hovered 1440 * child to the view group or vice-versa as needed. 1441 * </p><p> 1442 * If this method returns <code>true</code> and a child is already hovered, then the 1443 * child view will first receive a hover exit event and then the view group 1444 * itself will receive a hover enter event in {@link #onHoverEvent}. 1445 * Likewise, if this method had previously returned <code>true</code> to intercept hover 1446 * events and instead returns <code>false</code> while the pointer is hovering 1447 * within the bounds of one of a child, then the view group will first receive a 1448 * hover exit event in {@link #onHoverEvent} and then the hovered child will 1449 * receive a hover enter event. 1450 * </p><p> 1451 * The default implementation always returns false. 1452 * </p> 1453 * 1454 * @param event The motion event that describes the hover. 1455 * @return True if the view group would like to intercept the hover event 1456 * and prevent its children from receiving it. 1457 */ 1458 public boolean onInterceptHoverEvent(MotionEvent event) { 1459 return false; 1460 } 1461 1462 private static MotionEvent obtainMotionEventNoHistoryOrSelf(MotionEvent event) { 1463 if (event.getHistorySize() == 0) { 1464 return event; 1465 } 1466 return MotionEvent.obtainNoHistory(event); 1467 } 1468 1469 /** 1470 * {@inheritDoc} 1471 */ 1472 @Override 1473 protected boolean dispatchGenericPointerEvent(MotionEvent event) { 1474 // Send the event to the child under the pointer. 1475 final int childrenCount = mChildrenCount; 1476 if (childrenCount != 0) { 1477 final View[] children = mChildren; 1478 final float x = event.getX(); 1479 final float y = event.getY(); 1480 1481 for (int i = childrenCount - 1; i >= 0; i--) { 1482 final View child = children[i]; 1483 if (!canViewReceivePointerEvents(child) 1484 || !isTransformedTouchPointInView(x, y, child, null)) { 1485 continue; 1486 } 1487 1488 if (dispatchTransformedGenericPointerEvent(event, child)) { 1489 return true; 1490 } 1491 } 1492 } 1493 1494 // No child handled the event. Send it to this view group. 1495 return super.dispatchGenericPointerEvent(event); 1496 } 1497 1498 /** 1499 * {@inheritDoc} 1500 */ 1501 @Override 1502 protected boolean dispatchGenericFocusedEvent(MotionEvent event) { 1503 // Send the event to the focused child or to this view group if it has focus. 1504 if ((mPrivateFlags & (FOCUSED | HAS_BOUNDS)) == (FOCUSED | HAS_BOUNDS)) { 1505 return super.dispatchGenericFocusedEvent(event); 1506 } else if (mFocused != null && (mFocused.mPrivateFlags & HAS_BOUNDS) == HAS_BOUNDS) { 1507 return mFocused.dispatchGenericMotionEvent(event); 1508 } 1509 return false; 1510 } 1511 1512 /** 1513 * Dispatches a generic pointer event to a child, taking into account 1514 * transformations that apply to the child. 1515 * 1516 * @param event The event to send. 1517 * @param child The view to send the event to. 1518 * @return {@code true} if the child handled the event. 1519 */ 1520 private boolean dispatchTransformedGenericPointerEvent(MotionEvent event, View child) { 1521 final float offsetX = mScrollX - child.mLeft; 1522 final float offsetY = mScrollY - child.mTop; 1523 1524 boolean handled; 1525 if (!child.hasIdentityMatrix()) { 1526 MotionEvent transformedEvent = MotionEvent.obtain(event); 1527 transformedEvent.offsetLocation(offsetX, offsetY); 1528 transformedEvent.transform(child.getInverseMatrix()); 1529 handled = child.dispatchGenericMotionEvent(transformedEvent); 1530 transformedEvent.recycle(); 1531 } else { 1532 event.offsetLocation(offsetX, offsetY); 1533 handled = child.dispatchGenericMotionEvent(event); 1534 event.offsetLocation(-offsetX, -offsetY); 1535 } 1536 return handled; 1537 } 1538 1539 /** 1540 * {@inheritDoc} 1541 */ 1542 @Override 1543 public boolean dispatchTouchEvent(MotionEvent ev) { 1544 if (mInputEventConsistencyVerifier != null) { 1545 mInputEventConsistencyVerifier.onTouchEvent(ev, 1); 1546 } 1547 1548 boolean handled = false; 1549 if (onFilterTouchEventForSecurity(ev)) { 1550 final int action = ev.getAction(); 1551 final int actionMasked = action & MotionEvent.ACTION_MASK; 1552 1553 // Handle an initial down. 1554 if (actionMasked == MotionEvent.ACTION_DOWN) { 1555 // Throw away all previous state when starting a new touch gesture. 1556 // The framework may have dropped the up or cancel event for the previous gesture 1557 // due to an app switch, ANR, or some other state change. 1558 cancelAndClearTouchTargets(ev); 1559 resetTouchState(); 1560 } 1561 1562 // Check for interception. 1563 final boolean intercepted; 1564 if (actionMasked == MotionEvent.ACTION_DOWN 1565 || mFirstTouchTarget != null) { 1566 final boolean disallowIntercept = (mGroupFlags & FLAG_DISALLOW_INTERCEPT) != 0; 1567 if (!disallowIntercept) { 1568 intercepted = onInterceptTouchEvent(ev); 1569 ev.setAction(action); // restore action in case it was changed 1570 } else { 1571 intercepted = false; 1572 } 1573 } else { 1574 // There are no touch targets and this action is not an initial down 1575 // so this view group continues to intercept touches. 1576 intercepted = true; 1577 } 1578 1579 // Check for cancelation. 1580 final boolean canceled = resetCancelNextUpFlag(this) 1581 || actionMasked == MotionEvent.ACTION_CANCEL; 1582 1583 // Update list of touch targets for pointer down, if needed. 1584 final boolean split = (mGroupFlags & FLAG_SPLIT_MOTION_EVENTS) != 0; 1585 TouchTarget newTouchTarget = null; 1586 boolean alreadyDispatchedToNewTouchTarget = false; 1587 if (!canceled && !intercepted) { 1588 if (actionMasked == MotionEvent.ACTION_DOWN 1589 || (split && actionMasked == MotionEvent.ACTION_POINTER_DOWN) 1590 || actionMasked == MotionEvent.ACTION_HOVER_MOVE) { 1591 final int actionIndex = ev.getActionIndex(); // always 0 for down 1592 final int idBitsToAssign = split ? 1 << ev.getPointerId(actionIndex) 1593 : TouchTarget.ALL_POINTER_IDS; 1594 1595 // Clean up earlier touch targets for this pointer id in case they 1596 // have become out of sync. 1597 removePointersFromTouchTargets(idBitsToAssign); 1598 1599 final int childrenCount = mChildrenCount; 1600 if (childrenCount != 0) { 1601 // Find a child that can receive the event. 1602 // Scan children from front to back. 1603 final View[] children = mChildren; 1604 final float x = ev.getX(actionIndex); 1605 final float y = ev.getY(actionIndex); 1606 1607 for (int i = childrenCount - 1; i >= 0; i--) { 1608 final View child = children[i]; 1609 if (!canViewReceivePointerEvents(child) 1610 || !isTransformedTouchPointInView(x, y, child, null)) { 1611 continue; 1612 } 1613 1614 newTouchTarget = getTouchTarget(child); 1615 if (newTouchTarget != null) { 1616 // Child is already receiving touch within its bounds. 1617 // Give it the new pointer in addition to the ones it is handling. 1618 newTouchTarget.pointerIdBits |= idBitsToAssign; 1619 break; 1620 } 1621 1622 resetCancelNextUpFlag(child); 1623 if (dispatchTransformedTouchEvent(ev, false, child, idBitsToAssign)) { 1624 // Child wants to receive touch within its bounds. 1625 mLastTouchDownTime = ev.getDownTime(); 1626 mLastTouchDownIndex = i; 1627 mLastTouchDownX = ev.getX(); 1628 mLastTouchDownY = ev.getY(); 1629 newTouchTarget = addTouchTarget(child, idBitsToAssign); 1630 alreadyDispatchedToNewTouchTarget = true; 1631 break; 1632 } 1633 } 1634 } 1635 1636 if (newTouchTarget == null && mFirstTouchTarget != null) { 1637 // Did not find a child to receive the event. 1638 // Assign the pointer to the least recently added target. 1639 newTouchTarget = mFirstTouchTarget; 1640 while (newTouchTarget.next != null) { 1641 newTouchTarget = newTouchTarget.next; 1642 } 1643 newTouchTarget.pointerIdBits |= idBitsToAssign; 1644 } 1645 } 1646 } 1647 1648 // Dispatch to touch targets. 1649 if (mFirstTouchTarget == null) { 1650 // No touch targets so treat this as an ordinary view. 1651 handled = dispatchTransformedTouchEvent(ev, canceled, null, 1652 TouchTarget.ALL_POINTER_IDS); 1653 } else { 1654 // Dispatch to touch targets, excluding the new touch target if we already 1655 // dispatched to it. Cancel touch targets if necessary. 1656 TouchTarget predecessor = null; 1657 TouchTarget target = mFirstTouchTarget; 1658 while (target != null) { 1659 final TouchTarget next = target.next; 1660 if (alreadyDispatchedToNewTouchTarget && target == newTouchTarget) { 1661 handled = true; 1662 } else { 1663 final boolean cancelChild = resetCancelNextUpFlag(target.child) 1664 || intercepted; 1665 if (dispatchTransformedTouchEvent(ev, cancelChild, 1666 target.child, target.pointerIdBits)) { 1667 handled = true; 1668 } 1669 if (cancelChild) { 1670 if (predecessor == null) { 1671 mFirstTouchTarget = next; 1672 } else { 1673 predecessor.next = next; 1674 } 1675 target.recycle(); 1676 target = next; 1677 continue; 1678 } 1679 } 1680 predecessor = target; 1681 target = next; 1682 } 1683 } 1684 1685 // Update list of touch targets for pointer up or cancel, if needed. 1686 if (canceled 1687 || actionMasked == MotionEvent.ACTION_UP 1688 || actionMasked == MotionEvent.ACTION_HOVER_MOVE) { 1689 resetTouchState(); 1690 } else if (split && actionMasked == MotionEvent.ACTION_POINTER_UP) { 1691 final int actionIndex = ev.getActionIndex(); 1692 final int idBitsToRemove = 1 << ev.getPointerId(actionIndex); 1693 removePointersFromTouchTargets(idBitsToRemove); 1694 } 1695 } 1696 1697 if (!handled && mInputEventConsistencyVerifier != null) { 1698 mInputEventConsistencyVerifier.onUnhandledEvent(ev, 1); 1699 } 1700 return handled; 1701 } 1702 1703 /** 1704 * Resets all touch state in preparation for a new cycle. 1705 */ 1706 private void resetTouchState() { 1707 clearTouchTargets(); 1708 resetCancelNextUpFlag(this); 1709 mGroupFlags &= ~FLAG_DISALLOW_INTERCEPT; 1710 } 1711 1712 /** 1713 * Resets the cancel next up flag. 1714 * Returns true if the flag was previously set. 1715 */ 1716 private boolean resetCancelNextUpFlag(View view) { 1717 if ((view.mPrivateFlags & CANCEL_NEXT_UP_EVENT) != 0) { 1718 view.mPrivateFlags &= ~CANCEL_NEXT_UP_EVENT; 1719 return true; 1720 } 1721 return false; 1722 } 1723 1724 /** 1725 * Clears all touch targets. 1726 */ 1727 private void clearTouchTargets() { 1728 TouchTarget target = mFirstTouchTarget; 1729 if (target != null) { 1730 do { 1731 TouchTarget next = target.next; 1732 target.recycle(); 1733 target = next; 1734 } while (target != null); 1735 mFirstTouchTarget = null; 1736 } 1737 } 1738 1739 /** 1740 * Cancels and clears all touch targets. 1741 */ 1742 private void cancelAndClearTouchTargets(MotionEvent event) { 1743 if (mFirstTouchTarget != null) { 1744 boolean syntheticEvent = false; 1745 if (event == null) { 1746 final long now = SystemClock.uptimeMillis(); 1747 event = MotionEvent.obtain(now, now, 1748 MotionEvent.ACTION_CANCEL, 0.0f, 0.0f, 0); 1749 event.setSource(InputDevice.SOURCE_TOUCHSCREEN); 1750 syntheticEvent = true; 1751 } 1752 1753 for (TouchTarget target = mFirstTouchTarget; target != null; target = target.next) { 1754 resetCancelNextUpFlag(target.child); 1755 dispatchTransformedTouchEvent(event, true, target.child, target.pointerIdBits); 1756 } 1757 clearTouchTargets(); 1758 1759 if (syntheticEvent) { 1760 event.recycle(); 1761 } 1762 } 1763 } 1764 1765 /** 1766 * Gets the touch target for specified child view. 1767 * Returns null if not found. 1768 */ 1769 private TouchTarget getTouchTarget(View child) { 1770 for (TouchTarget target = mFirstTouchTarget; target != null; target = target.next) { 1771 if (target.child == child) { 1772 return target; 1773 } 1774 } 1775 return null; 1776 } 1777 1778 /** 1779 * Adds a touch target for specified child to the beginning of the list. 1780 * Assumes the target child is not already present. 1781 */ 1782 private TouchTarget addTouchTarget(View child, int pointerIdBits) { 1783 TouchTarget target = TouchTarget.obtain(child, pointerIdBits); 1784 target.next = mFirstTouchTarget; 1785 mFirstTouchTarget = target; 1786 return target; 1787 } 1788 1789 /** 1790 * Removes the pointer ids from consideration. 1791 */ 1792 private void removePointersFromTouchTargets(int pointerIdBits) { 1793 TouchTarget predecessor = null; 1794 TouchTarget target = mFirstTouchTarget; 1795 while (target != null) { 1796 final TouchTarget next = target.next; 1797 if ((target.pointerIdBits & pointerIdBits) != 0) { 1798 target.pointerIdBits &= ~pointerIdBits; 1799 if (target.pointerIdBits == 0) { 1800 if (predecessor == null) { 1801 mFirstTouchTarget = next; 1802 } else { 1803 predecessor.next = next; 1804 } 1805 target.recycle(); 1806 target = next; 1807 continue; 1808 } 1809 } 1810 predecessor = target; 1811 target = next; 1812 } 1813 } 1814 1815 /** 1816 * Returns true if a child view can receive pointer events. 1817 * @hide 1818 */ 1819 private static boolean canViewReceivePointerEvents(View child) { 1820 return (child.mViewFlags & VISIBILITY_MASK) == VISIBLE 1821 || child.getAnimation() != null; 1822 } 1823 1824 /** 1825 * Returns true if a child view contains the specified point when transformed 1826 * into its coordinate space. 1827 * Child must not be null. 1828 * @hide 1829 */ 1830 protected boolean isTransformedTouchPointInView(float x, float y, View child, 1831 PointF outLocalPoint) { 1832 float localX = x + mScrollX - child.mLeft; 1833 float localY = y + mScrollY - child.mTop; 1834 if (! child.hasIdentityMatrix() && mAttachInfo != null) { 1835 final float[] localXY = mAttachInfo.mTmpTransformLocation; 1836 localXY[0] = localX; 1837 localXY[1] = localY; 1838 child.getInverseMatrix().mapPoints(localXY); 1839 localX = localXY[0]; 1840 localY = localXY[1]; 1841 } 1842 final boolean isInView = child.pointInView(localX, localY); 1843 if (isInView && outLocalPoint != null) { 1844 outLocalPoint.set(localX, localY); 1845 } 1846 return isInView; 1847 } 1848 1849 /** 1850 * Transforms a motion event into the coordinate space of a particular child view, 1851 * filters out irrelevant pointer ids, and overrides its action if necessary. 1852 * If child is null, assumes the MotionEvent will be sent to this ViewGroup instead. 1853 */ 1854 private boolean dispatchTransformedTouchEvent(MotionEvent event, boolean cancel, 1855 View child, int desiredPointerIdBits) { 1856 final boolean handled; 1857 1858 // Canceling motions is a special case. We don't need to perform any transformations 1859 // or filtering. The important part is the action, not the contents. 1860 final int oldAction = event.getAction(); 1861 if (cancel || oldAction == MotionEvent.ACTION_CANCEL) { 1862 event.setAction(MotionEvent.ACTION_CANCEL); 1863 if (child == null) { 1864 handled = super.dispatchTouchEvent(event); 1865 } else { 1866 handled = child.dispatchTouchEvent(event); 1867 } 1868 event.setAction(oldAction); 1869 return handled; 1870 } 1871 1872 // Calculate the number of pointers to deliver. 1873 final int oldPointerIdBits = event.getPointerIdBits(); 1874 final int newPointerIdBits = oldPointerIdBits & desiredPointerIdBits; 1875 1876 // If for some reason we ended up in an inconsistent state where it looks like we 1877 // might produce a motion event with no pointers in it, then drop the event. 1878 if (newPointerIdBits == 0) { 1879 return false; 1880 } 1881 1882 // If the number of pointers is the same and we don't need to perform any fancy 1883 // irreversible transformations, then we can reuse the motion event for this 1884 // dispatch as long as we are careful to revert any changes we make. 1885 // Otherwise we need to make a copy. 1886 final MotionEvent transformedEvent; 1887 if (newPointerIdBits == oldPointerIdBits) { 1888 if (child == null || child.hasIdentityMatrix()) { 1889 if (child == null) { 1890 handled = super.dispatchTouchEvent(event); 1891 } else { 1892 final float offsetX = mScrollX - child.mLeft; 1893 final float offsetY = mScrollY - child.mTop; 1894 event.offsetLocation(offsetX, offsetY); 1895 1896 handled = child.dispatchTouchEvent(event); 1897 1898 event.offsetLocation(-offsetX, -offsetY); 1899 } 1900 return handled; 1901 } 1902 transformedEvent = MotionEvent.obtain(event); 1903 } else { 1904 transformedEvent = event.split(newPointerIdBits); 1905 } 1906 1907 // Perform any necessary transformations and dispatch. 1908 if (child == null) { 1909 handled = super.dispatchTouchEvent(transformedEvent); 1910 } else { 1911 final float offsetX = mScrollX - child.mLeft; 1912 final float offsetY = mScrollY - child.mTop; 1913 transformedEvent.offsetLocation(offsetX, offsetY); 1914 if (! child.hasIdentityMatrix()) { 1915 transformedEvent.transform(child.getInverseMatrix()); 1916 } 1917 1918 handled = child.dispatchTouchEvent(transformedEvent); 1919 } 1920 1921 // Done. 1922 transformedEvent.recycle(); 1923 return handled; 1924 } 1925 1926 /** 1927 * Enable or disable the splitting of MotionEvents to multiple children during touch event 1928 * dispatch. This behavior is enabled by default for applications that target an 1929 * SDK version of {@link Build.VERSION_CODES#HONEYCOMB} or newer. 1930 * 1931 * <p>When this option is enabled MotionEvents may be split and dispatched to different child 1932 * views depending on where each pointer initially went down. This allows for user interactions 1933 * such as scrolling two panes of content independently, chording of buttons, and performing 1934 * independent gestures on different pieces of content. 1935 * 1936 * @param split <code>true</code> to allow MotionEvents to be split and dispatched to multiple 1937 * child views. <code>false</code> to only allow one child view to be the target of 1938 * any MotionEvent received by this ViewGroup. 1939 */ 1940 public void setMotionEventSplittingEnabled(boolean split) { 1941 // TODO Applications really shouldn't change this setting mid-touch event, 1942 // but perhaps this should handle that case and send ACTION_CANCELs to any child views 1943 // with gestures in progress when this is changed. 1944 if (split) { 1945 mGroupFlags |= FLAG_SPLIT_MOTION_EVENTS; 1946 } else { 1947 mGroupFlags &= ~FLAG_SPLIT_MOTION_EVENTS; 1948 } 1949 } 1950 1951 /** 1952 * Returns true if MotionEvents dispatched to this ViewGroup can be split to multiple children. 1953 * @return true if MotionEvents dispatched to this ViewGroup can be split to multiple children. 1954 */ 1955 public boolean isMotionEventSplittingEnabled() { 1956 return (mGroupFlags & FLAG_SPLIT_MOTION_EVENTS) == FLAG_SPLIT_MOTION_EVENTS; 1957 } 1958 1959 /** 1960 * {@inheritDoc} 1961 */ 1962 public void requestDisallowInterceptTouchEvent(boolean disallowIntercept) { 1963 1964 if (disallowIntercept == ((mGroupFlags & FLAG_DISALLOW_INTERCEPT) != 0)) { 1965 // We're already in this state, assume our ancestors are too 1966 return; 1967 } 1968 1969 if (disallowIntercept) { 1970 mGroupFlags |= FLAG_DISALLOW_INTERCEPT; 1971 } else { 1972 mGroupFlags &= ~FLAG_DISALLOW_INTERCEPT; 1973 } 1974 1975 // Pass it up to our parent 1976 if (mParent != null) { 1977 mParent.requestDisallowInterceptTouchEvent(disallowIntercept); 1978 } 1979 } 1980 1981 /** 1982 * Implement this method to intercept all touch screen motion events. This 1983 * allows you to watch events as they are dispatched to your children, and 1984 * take ownership of the current gesture at any point. 1985 * 1986 * <p>Using this function takes some care, as it has a fairly complicated 1987 * interaction with {@link View#onTouchEvent(MotionEvent) 1988 * View.onTouchEvent(MotionEvent)}, and using it requires implementing 1989 * that method as well as this one in the correct way. Events will be 1990 * received in the following order: 1991 * 1992 * <ol> 1993 * <li> You will receive the down event here. 1994 * <li> The down event will be handled either by a child of this view 1995 * group, or given to your own onTouchEvent() method to handle; this means 1996 * you should implement onTouchEvent() to return true, so you will 1997 * continue to see the rest of the gesture (instead of looking for 1998 * a parent view to handle it). Also, by returning true from 1999 * onTouchEvent(), you will not receive any following 2000 * events in onInterceptTouchEvent() and all touch processing must 2001 * happen in onTouchEvent() like normal. 2002 * <li> For as long as you return false from this function, each following 2003 * event (up to and including the final up) will be delivered first here 2004 * and then to the target's onTouchEvent(). 2005 * <li> If you return true from here, you will not receive any 2006 * following events: the target view will receive the same event but 2007 * with the action {@link MotionEvent#ACTION_CANCEL}, and all further 2008 * events will be delivered to your onTouchEvent() method and no longer 2009 * appear here. 2010 * </ol> 2011 * 2012 * @param ev The motion event being dispatched down the hierarchy. 2013 * @return Return true to steal motion events from the children and have 2014 * them dispatched to this ViewGroup through onTouchEvent(). 2015 * The current target will receive an ACTION_CANCEL event, and no further 2016 * messages will be delivered here. 2017 */ 2018 public boolean onInterceptTouchEvent(MotionEvent ev) { 2019 return false; 2020 } 2021 2022 /** 2023 * {@inheritDoc} 2024 * 2025 * Looks for a view to give focus to respecting the setting specified by 2026 * {@link #getDescendantFocusability()}. 2027 * 2028 * Uses {@link #onRequestFocusInDescendants(int, android.graphics.Rect)} to 2029 * find focus within the children of this group when appropriate. 2030 * 2031 * @see #FOCUS_BEFORE_DESCENDANTS 2032 * @see #FOCUS_AFTER_DESCENDANTS 2033 * @see #FOCUS_BLOCK_DESCENDANTS 2034 * @see #onRequestFocusInDescendants(int, android.graphics.Rect) 2035 */ 2036 @Override 2037 public boolean requestFocus(int direction, Rect previouslyFocusedRect) { 2038 if (DBG) { 2039 System.out.println(this + " ViewGroup.requestFocus direction=" 2040 + direction); 2041 } 2042 int descendantFocusability = getDescendantFocusability(); 2043 2044 switch (descendantFocusability) { 2045 case FOCUS_BLOCK_DESCENDANTS: 2046 return super.requestFocus(direction, previouslyFocusedRect); 2047 case FOCUS_BEFORE_DESCENDANTS: { 2048 final boolean took = super.requestFocus(direction, previouslyFocusedRect); 2049 return took ? took : onRequestFocusInDescendants(direction, previouslyFocusedRect); 2050 } 2051 case FOCUS_AFTER_DESCENDANTS: { 2052 final boolean took = onRequestFocusInDescendants(direction, previouslyFocusedRect); 2053 return took ? took : super.requestFocus(direction, previouslyFocusedRect); 2054 } 2055 default: 2056 throw new IllegalStateException("descendant focusability must be " 2057 + "one of FOCUS_BEFORE_DESCENDANTS, FOCUS_AFTER_DESCENDANTS, FOCUS_BLOCK_DESCENDANTS " 2058 + "but is " + descendantFocusability); 2059 } 2060 } 2061 2062 /** 2063 * Look for a descendant to call {@link View#requestFocus} on. 2064 * Called by {@link ViewGroup#requestFocus(int, android.graphics.Rect)} 2065 * when it wants to request focus within its children. Override this to 2066 * customize how your {@link ViewGroup} requests focus within its children. 2067 * @param direction One of FOCUS_UP, FOCUS_DOWN, FOCUS_LEFT, and FOCUS_RIGHT 2068 * @param previouslyFocusedRect The rectangle (in this View's coordinate system) 2069 * to give a finer grained hint about where focus is coming from. May be null 2070 * if there is no hint. 2071 * @return Whether focus was taken. 2072 */ 2073 @SuppressWarnings({"ConstantConditions"}) 2074 protected boolean onRequestFocusInDescendants(int direction, 2075 Rect previouslyFocusedRect) { 2076 int index; 2077 int increment; 2078 int end; 2079 int count = mChildrenCount; 2080 if ((direction & FOCUS_FORWARD) != 0) { 2081 index = 0; 2082 increment = 1; 2083 end = count; 2084 } else { 2085 index = count - 1; 2086 increment = -1; 2087 end = -1; 2088 } 2089 final View[] children = mChildren; 2090 for (int i = index; i != end; i += increment) { 2091 View child = children[i]; 2092 if ((child.mViewFlags & VISIBILITY_MASK) == VISIBLE) { 2093 if (child.requestFocus(direction, previouslyFocusedRect)) { 2094 return true; 2095 } 2096 } 2097 } 2098 return false; 2099 } 2100 2101 /** 2102 * {@inheritDoc} 2103 * 2104 * @hide 2105 */ 2106 @Override 2107 public void dispatchStartTemporaryDetach() { 2108 super.dispatchStartTemporaryDetach(); 2109 final int count = mChildrenCount; 2110 final View[] children = mChildren; 2111 for (int i = 0; i < count; i++) { 2112 children[i].dispatchStartTemporaryDetach(); 2113 } 2114 } 2115 2116 /** 2117 * {@inheritDoc} 2118 * 2119 * @hide 2120 */ 2121 @Override 2122 public void dispatchFinishTemporaryDetach() { 2123 super.dispatchFinishTemporaryDetach(); 2124 final int count = mChildrenCount; 2125 final View[] children = mChildren; 2126 for (int i = 0; i < count; i++) { 2127 children[i].dispatchFinishTemporaryDetach(); 2128 } 2129 } 2130 2131 /** 2132 * {@inheritDoc} 2133 */ 2134 @Override 2135 void dispatchAttachedToWindow(AttachInfo info, int visibility) { 2136 super.dispatchAttachedToWindow(info, visibility); 2137 visibility |= mViewFlags & VISIBILITY_MASK; 2138 final int count = mChildrenCount; 2139 final View[] children = mChildren; 2140 for (int i = 0; i < count; i++) { 2141 children[i].dispatchAttachedToWindow(info, visibility); 2142 } 2143 } 2144 2145 @Override 2146 public boolean dispatchPopulateAccessibilityEvent(AccessibilityEvent event) { 2147 // We first get a chance to populate the event. 2148 onPopulateAccessibilityEvent(event); 2149 // Let our children have a shot in populating the event. 2150 for (int i = 0, count = getChildCount(); i < count; i++) { 2151 boolean handled = getChildAt(i).dispatchPopulateAccessibilityEvent(event); 2152 if (handled) { 2153 return handled; 2154 } 2155 } 2156 return false; 2157 } 2158 2159 @Override 2160 public void onInitializeAccessibilityNodeInfo(AccessibilityNodeInfo info) { 2161 super.onInitializeAccessibilityNodeInfo(info); 2162 for (int i = 0, count = mChildrenCount; i < count; i++) { 2163 View child = mChildren[i]; 2164 if ((child.mViewFlags & VISIBILITY_MASK) == VISIBLE) { 2165 info.addChild(child); 2166 } 2167 } 2168 } 2169 2170 /** 2171 * {@inheritDoc} 2172 */ 2173 @Override 2174 void dispatchDetachedFromWindow() { 2175 // If we still have a touch target, we are still in the process of 2176 // dispatching motion events to a child; we need to get rid of that 2177 // child to avoid dispatching events to it after the window is torn 2178 // down. To make sure we keep the child in a consistent state, we 2179 // first send it an ACTION_CANCEL motion event. 2180 cancelAndClearTouchTargets(null); 2181 2182 // In case view is detached while transition is running 2183 mLayoutSuppressed = false; 2184 2185 // Tear down our drag tracking 2186 mDragNotifiedChildren = null; 2187 if (mCurrentDrag != null) { 2188 mCurrentDrag.recycle(); 2189 mCurrentDrag = null; 2190 } 2191 2192 final int count = mChildrenCount; 2193 final View[] children = mChildren; 2194 for (int i = 0; i < count; i++) { 2195 children[i].dispatchDetachedFromWindow(); 2196 } 2197 super.dispatchDetachedFromWindow(); 2198 } 2199 2200 /** 2201 * {@inheritDoc} 2202 */ 2203 @Override 2204 public void setPadding(int left, int top, int right, int bottom) { 2205 super.setPadding(left, top, right, bottom); 2206 2207 if ((mPaddingLeft | mPaddingTop | mPaddingRight | mPaddingBottom) != 0) { 2208 mGroupFlags |= FLAG_PADDING_NOT_NULL; 2209 } else { 2210 mGroupFlags &= ~FLAG_PADDING_NOT_NULL; 2211 } 2212 } 2213 2214 /** 2215 * {@inheritDoc} 2216 */ 2217 @Override 2218 protected void dispatchSaveInstanceState(SparseArray<Parcelable> container) { 2219 super.dispatchSaveInstanceState(container); 2220 final int count = mChildrenCount; 2221 final View[] children = mChildren; 2222 for (int i = 0; i < count; i++) { 2223 View c = children[i]; 2224 if ((c.mViewFlags & PARENT_SAVE_DISABLED_MASK) != PARENT_SAVE_DISABLED) { 2225 c.dispatchSaveInstanceState(container); 2226 } 2227 } 2228 } 2229 2230 /** 2231 * Perform dispatching of a {@link #saveHierarchyState(android.util.SparseArray)} freeze()} 2232 * to only this view, not to its children. For use when overriding 2233 * {@link #dispatchSaveInstanceState(android.util.SparseArray)} dispatchFreeze()} to allow 2234 * subclasses to freeze their own state but not the state of their children. 2235 * 2236 * @param container the container 2237 */ 2238 protected void dispatchFreezeSelfOnly(SparseArray<Parcelable> container) { 2239 super.dispatchSaveInstanceState(container); 2240 } 2241 2242 /** 2243 * {@inheritDoc} 2244 */ 2245 @Override 2246 protected void dispatchRestoreInstanceState(SparseArray<Parcelable> container) { 2247 super.dispatchRestoreInstanceState(container); 2248 final int count = mChildrenCount; 2249 final View[] children = mChildren; 2250 for (int i = 0; i < count; i++) { 2251 View c = children[i]; 2252 if ((c.mViewFlags & PARENT_SAVE_DISABLED_MASK) != PARENT_SAVE_DISABLED) { 2253 c.dispatchRestoreInstanceState(container); 2254 } 2255 } 2256 } 2257 2258 /** 2259 * Perform dispatching of a {@link #restoreHierarchyState(android.util.SparseArray)} 2260 * to only this view, not to its children. For use when overriding 2261 * {@link #dispatchRestoreInstanceState(android.util.SparseArray)} to allow 2262 * subclasses to thaw their own state but not the state of their children. 2263 * 2264 * @param container the container 2265 */ 2266 protected void dispatchThawSelfOnly(SparseArray<Parcelable> container) { 2267 super.dispatchRestoreInstanceState(container); 2268 } 2269 2270 /** 2271 * Enables or disables the drawing cache for each child of this view group. 2272 * 2273 * @param enabled true to enable the cache, false to dispose of it 2274 */ 2275 protected void setChildrenDrawingCacheEnabled(boolean enabled) { 2276 if (enabled || (mPersistentDrawingCache & PERSISTENT_ALL_CACHES) != PERSISTENT_ALL_CACHES) { 2277 final View[] children = mChildren; 2278 final int count = mChildrenCount; 2279 for (int i = 0; i < count; i++) { 2280 children[i].setDrawingCacheEnabled(enabled); 2281 } 2282 } 2283 } 2284 2285 @Override 2286 protected void onAnimationStart() { 2287 super.onAnimationStart(); 2288 2289 // When this ViewGroup's animation starts, build the cache for the children 2290 if ((mGroupFlags & FLAG_ANIMATION_CACHE) == FLAG_ANIMATION_CACHE) { 2291 final int count = mChildrenCount; 2292 final View[] children = mChildren; 2293 final boolean buildCache = !isHardwareAccelerated(); 2294 2295 for (int i = 0; i < count; i++) { 2296 final View child = children[i]; 2297 if ((child.mViewFlags & VISIBILITY_MASK) == VISIBLE) { 2298 child.setDrawingCacheEnabled(true); 2299 if (buildCache) { 2300 child.buildDrawingCache(true); 2301 } 2302 } 2303 } 2304 2305 mGroupFlags |= FLAG_CHILDREN_DRAWN_WITH_CACHE; 2306 } 2307 } 2308 2309 @Override 2310 protected void onAnimationEnd() { 2311 super.onAnimationEnd(); 2312 2313 // When this ViewGroup's animation ends, destroy the cache of the children 2314 if ((mGroupFlags & FLAG_ANIMATION_CACHE) == FLAG_ANIMATION_CACHE) { 2315 mGroupFlags &= ~FLAG_CHILDREN_DRAWN_WITH_CACHE; 2316 2317 if ((mPersistentDrawingCache & PERSISTENT_ANIMATION_CACHE) == 0) { 2318 setChildrenDrawingCacheEnabled(false); 2319 } 2320 } 2321 } 2322 2323 @Override 2324 Bitmap createSnapshot(Bitmap.Config quality, int backgroundColor, boolean skipChildren) { 2325 int count = mChildrenCount; 2326 int[] visibilities = null; 2327 2328 if (skipChildren) { 2329 visibilities = new int[count]; 2330 for (int i = 0; i < count; i++) { 2331 View child = getChildAt(i); 2332 visibilities[i] = child.getVisibility(); 2333 if (visibilities[i] == View.VISIBLE) { 2334 child.setVisibility(INVISIBLE); 2335 } 2336 } 2337 } 2338 2339 Bitmap b = super.createSnapshot(quality, backgroundColor, skipChildren); 2340 2341 if (skipChildren) { 2342 for (int i = 0; i < count; i++) { 2343 getChildAt(i).setVisibility(visibilities[i]); 2344 } 2345 } 2346 2347 return b; 2348 } 2349 2350 /** 2351 * {@inheritDoc} 2352 */ 2353 @Override 2354 protected void dispatchDraw(Canvas canvas) { 2355 final int count = mChildrenCount; 2356 final View[] children = mChildren; 2357 int flags = mGroupFlags; 2358 2359 if ((flags & FLAG_RUN_ANIMATION) != 0 && canAnimate()) { 2360 final boolean cache = (mGroupFlags & FLAG_ANIMATION_CACHE) == FLAG_ANIMATION_CACHE; 2361 2362 final boolean buildCache = !isHardwareAccelerated(); 2363 for (int i = 0; i < count; i++) { 2364 final View child = children[i]; 2365 if ((child.mViewFlags & VISIBILITY_MASK) == VISIBLE) { 2366 final LayoutParams params = child.getLayoutParams(); 2367 attachLayoutAnimationParameters(child, params, i, count); 2368 bindLayoutAnimation(child); 2369 if (cache) { 2370 child.setDrawingCacheEnabled(true); 2371 if (buildCache) { 2372 child.buildDrawingCache(true); 2373 } 2374 } 2375 } 2376 } 2377 2378 final LayoutAnimationController controller = mLayoutAnimationController; 2379 if (controller.willOverlap()) { 2380 mGroupFlags |= FLAG_OPTIMIZE_INVALIDATE; 2381 } 2382 2383 controller.start(); 2384 2385 mGroupFlags &= ~FLAG_RUN_ANIMATION; 2386 mGroupFlags &= ~FLAG_ANIMATION_DONE; 2387 2388 if (cache) { 2389 mGroupFlags |= FLAG_CHILDREN_DRAWN_WITH_CACHE; 2390 } 2391 2392 if (mAnimationListener != null) { 2393 mAnimationListener.onAnimationStart(controller.getAnimation()); 2394 } 2395 } 2396 2397 int saveCount = 0; 2398 final boolean clipToPadding = (flags & CLIP_TO_PADDING_MASK) == CLIP_TO_PADDING_MASK; 2399 if (clipToPadding) { 2400 saveCount = canvas.save(); 2401 canvas.clipRect(mScrollX + mPaddingLeft, mScrollY + mPaddingTop, 2402 mScrollX + mRight - mLeft - mPaddingRight, 2403 mScrollY + mBottom - mTop - mPaddingBottom); 2404 2405 } 2406 2407 // We will draw our child's animation, let's reset the flag 2408 mPrivateFlags &= ~DRAW_ANIMATION; 2409 mGroupFlags &= ~FLAG_INVALIDATE_REQUIRED; 2410 2411 boolean more = false; 2412 final long drawingTime = getDrawingTime(); 2413 2414 if ((flags & FLAG_USE_CHILD_DRAWING_ORDER) == 0) { 2415 for (int i = 0; i < count; i++) { 2416 final View child = children[i]; 2417 if ((child.mViewFlags & VISIBILITY_MASK) == VISIBLE || child.getAnimation() != null) { 2418 more |= drawChild(canvas, child, drawingTime); 2419 } 2420 } 2421 } else { 2422 for (int i = 0; i < count; i++) { 2423 final View child = children[getChildDrawingOrder(count, i)]; 2424 if ((child.mViewFlags & VISIBILITY_MASK) == VISIBLE || child.getAnimation() != null) { 2425 more |= drawChild(canvas, child, drawingTime); 2426 } 2427 } 2428 } 2429 2430 // Draw any disappearing views that have animations 2431 if (mDisappearingChildren != null) { 2432 final ArrayList<View> disappearingChildren = mDisappearingChildren; 2433 final int disappearingCount = disappearingChildren.size() - 1; 2434 // Go backwards -- we may delete as animations finish 2435 for (int i = disappearingCount; i >= 0; i--) { 2436 final View child = disappearingChildren.get(i); 2437 more |= drawChild(canvas, child, drawingTime); 2438 } 2439 } 2440 2441 if (clipToPadding) { 2442 canvas.restoreToCount(saveCount); 2443 } 2444 2445 // mGroupFlags might have been updated by drawChild() 2446 flags = mGroupFlags; 2447 2448 if ((flags & FLAG_INVALIDATE_REQUIRED) == FLAG_INVALIDATE_REQUIRED) { 2449 invalidate(true); 2450 } 2451 2452 if ((flags & FLAG_ANIMATION_DONE) == 0 && (flags & FLAG_NOTIFY_ANIMATION_LISTENER) == 0 && 2453 mLayoutAnimationController.isDone() && !more) { 2454 // We want to erase the drawing cache and notify the listener after the 2455 // next frame is drawn because one extra invalidate() is caused by 2456 // drawChild() after the animation is over 2457 mGroupFlags |= FLAG_NOTIFY_ANIMATION_LISTENER; 2458 final Runnable end = new Runnable() { 2459 public void run() { 2460 notifyAnimationListener(); 2461 } 2462 }; 2463 post(end); 2464 } 2465 } 2466 2467 /** 2468 * Returns the index of the child to draw for this iteration. Override this 2469 * if you want to change the drawing order of children. By default, it 2470 * returns i. 2471 * <p> 2472 * NOTE: In order for this method to be called, you must enable child ordering 2473 * first by calling {@link #setChildrenDrawingOrderEnabled(boolean)}. 2474 * 2475 * @param i The current iteration. 2476 * @return The index of the child to draw this iteration. 2477 * 2478 * @see #setChildrenDrawingOrderEnabled(boolean) 2479 * @see #isChildrenDrawingOrderEnabled() 2480 */ 2481 protected int getChildDrawingOrder(int childCount, int i) { 2482 return i; 2483 } 2484 2485 private void notifyAnimationListener() { 2486 mGroupFlags &= ~FLAG_NOTIFY_ANIMATION_LISTENER; 2487 mGroupFlags |= FLAG_ANIMATION_DONE; 2488 2489 if (mAnimationListener != null) { 2490 final Runnable end = new Runnable() { 2491 public void run() { 2492 mAnimationListener.onAnimationEnd(mLayoutAnimationController.getAnimation()); 2493 } 2494 }; 2495 post(end); 2496 } 2497 2498 if ((mGroupFlags & FLAG_ANIMATION_CACHE) == FLAG_ANIMATION_CACHE) { 2499 mGroupFlags &= ~FLAG_CHILDREN_DRAWN_WITH_CACHE; 2500 if ((mPersistentDrawingCache & PERSISTENT_ANIMATION_CACHE) == 0) { 2501 setChildrenDrawingCacheEnabled(false); 2502 } 2503 } 2504 2505 invalidate(true); 2506 } 2507 2508 /** 2509 * This method is used to cause children of this ViewGroup to restore or recreate their 2510 * display lists. It is called by getDisplayList() when the parent ViewGroup does not need 2511 * to recreate its own display list, which would happen if it went through the normal 2512 * draw/dispatchDraw mechanisms. 2513 * 2514 * @hide 2515 */ 2516 @Override 2517 protected void dispatchGetDisplayList() { 2518 final int count = mChildrenCount; 2519 final View[] children = mChildren; 2520 for (int i = 0; i < count; i++) { 2521 final View child = children[i]; 2522 if ((child.mViewFlags & VISIBILITY_MASK) == VISIBLE || child.getAnimation() != null) { 2523 child.mRecreateDisplayList = (child.mPrivateFlags & INVALIDATED) == INVALIDATED; 2524 child.mPrivateFlags &= ~INVALIDATED; 2525 child.getDisplayList(); 2526 child.mRecreateDisplayList = false; 2527 } 2528 } 2529 } 2530 2531 /** 2532 * Draw one child of this View Group. This method is responsible for getting 2533 * the canvas in the right state. This includes clipping, translating so 2534 * that the child's scrolled origin is at 0, 0, and applying any animation 2535 * transformations. 2536 * 2537 * @param canvas The canvas on which to draw the child 2538 * @param child Who to draw 2539 * @param drawingTime The time at which draw is occuring 2540 * @return True if an invalidate() was issued 2541 */ 2542 protected boolean drawChild(Canvas canvas, View child, long drawingTime) { 2543 boolean more = false; 2544 2545 final int cl = child.mLeft; 2546 final int ct = child.mTop; 2547 final int cr = child.mRight; 2548 final int cb = child.mBottom; 2549 2550 final boolean childHasIdentityMatrix = child.hasIdentityMatrix(); 2551 2552 final int flags = mGroupFlags; 2553 2554 if ((flags & FLAG_CLEAR_TRANSFORMATION) == FLAG_CLEAR_TRANSFORMATION) { 2555 mChildTransformation.clear(); 2556 mGroupFlags &= ~FLAG_CLEAR_TRANSFORMATION; 2557 } 2558 2559 Transformation transformToApply = null; 2560 Transformation invalidationTransform; 2561 final Animation a = child.getAnimation(); 2562 boolean concatMatrix = false; 2563 2564 boolean scalingRequired = false; 2565 boolean caching; 2566 int layerType = mDrawLayers ? child.getLayerType() : LAYER_TYPE_NONE; 2567 2568 final boolean hardwareAccelerated = canvas.isHardwareAccelerated(); 2569 if ((flags & FLAG_CHILDREN_DRAWN_WITH_CACHE) == FLAG_CHILDREN_DRAWN_WITH_CACHE || 2570 (flags & FLAG_ALWAYS_DRAWN_WITH_CACHE) == FLAG_ALWAYS_DRAWN_WITH_CACHE) { 2571 caching = true; 2572 if (mAttachInfo != null) scalingRequired = mAttachInfo.mScalingRequired; 2573 } else { 2574 caching = (layerType != LAYER_TYPE_NONE) || hardwareAccelerated; 2575 } 2576 2577 if (a != null) { 2578 final boolean initialized = a.isInitialized(); 2579 if (!initialized) { 2580 a.initialize(cr - cl, cb - ct, getWidth(), getHeight()); 2581 a.initializeInvalidateRegion(0, 0, cr - cl, cb - ct); 2582 child.onAnimationStart(); 2583 } 2584 2585 more = a.getTransformation(drawingTime, mChildTransformation, 2586 scalingRequired ? mAttachInfo.mApplicationScale : 1f); 2587 if (scalingRequired && mAttachInfo.mApplicationScale != 1f) { 2588 if (mInvalidationTransformation == null) { 2589 mInvalidationTransformation = new Transformation(); 2590 } 2591 invalidationTransform = mInvalidationTransformation; 2592 a.getTransformation(drawingTime, invalidationTransform, 1f); 2593 } else { 2594 invalidationTransform = mChildTransformation; 2595 } 2596 transformToApply = mChildTransformation; 2597 2598 concatMatrix = a.willChangeTransformationMatrix(); 2599 2600 if (more) { 2601 if (!a.willChangeBounds()) { 2602 if ((flags & (FLAG_OPTIMIZE_INVALIDATE | FLAG_ANIMATION_DONE)) == 2603 FLAG_OPTIMIZE_INVALIDATE) { 2604 mGroupFlags |= FLAG_INVALIDATE_REQUIRED; 2605 } else if ((flags & FLAG_INVALIDATE_REQUIRED) == 0) { 2606 // The child need to draw an animation, potentially offscreen, so 2607 // make sure we do not cancel invalidate requests 2608 mPrivateFlags |= DRAW_ANIMATION; 2609 invalidate(cl, ct, cr, cb); 2610 } 2611 } else { 2612 if (mInvalidateRegion == null) { 2613 mInvalidateRegion = new RectF(); 2614 } 2615 final RectF region = mInvalidateRegion; 2616 a.getInvalidateRegion(0, 0, cr - cl, cb - ct, region, invalidationTransform); 2617 2618 // The child need to draw an animation, potentially offscreen, so 2619 // make sure we do not cancel invalidate requests 2620 mPrivateFlags |= DRAW_ANIMATION; 2621 2622 final int left = cl + (int) region.left; 2623 final int top = ct + (int) region.top; 2624 invalidate(left, top, left + (int) region.width(), top + (int) region.height()); 2625 } 2626 } 2627 } else if ((flags & FLAG_SUPPORT_STATIC_TRANSFORMATIONS) == 2628 FLAG_SUPPORT_STATIC_TRANSFORMATIONS) { 2629 final boolean hasTransform = getChildStaticTransformation(child, mChildTransformation); 2630 if (hasTransform) { 2631 final int transformType = mChildTransformation.getTransformationType(); 2632 transformToApply = transformType != Transformation.TYPE_IDENTITY ? 2633 mChildTransformation : null; 2634 concatMatrix = (transformType & Transformation.TYPE_MATRIX) != 0; 2635 } 2636 } 2637 2638 concatMatrix |= !childHasIdentityMatrix; 2639 2640 // Sets the flag as early as possible to allow draw() implementations 2641 // to call invalidate() successfully when doing animations 2642 child.mPrivateFlags |= DRAWN; 2643 2644 if (!concatMatrix && canvas.quickReject(cl, ct, cr, cb, Canvas.EdgeType.BW) && 2645 (child.mPrivateFlags & DRAW_ANIMATION) == 0) { 2646 return more; 2647 } 2648 2649 float alpha = child.getAlpha(); 2650 // Bail out early if the view does not need to be drawn 2651 if (alpha <= ViewConfiguration.ALPHA_THRESHOLD && (child.mPrivateFlags & ALPHA_SET) == 0 && 2652 !(child instanceof SurfaceView)) { 2653 return more; 2654 } 2655 2656 if (hardwareAccelerated) { 2657 // Clear INVALIDATED flag to allow invalidation to occur during rendering, but 2658 // retain the flag's value temporarily in the mRecreateDisplayList flag 2659 child.mRecreateDisplayList = (child.mPrivateFlags & INVALIDATED) == INVALIDATED; 2660 child.mPrivateFlags &= ~INVALIDATED; 2661 } 2662 2663 child.computeScroll(); 2664 2665 final int sx = child.mScrollX; 2666 final int sy = child.mScrollY; 2667 2668 DisplayList displayList = null; 2669 Bitmap cache = null; 2670 boolean hasDisplayList = false; 2671 if (caching) { 2672 if (!hardwareAccelerated) { 2673 if (layerType != LAYER_TYPE_NONE) { 2674 layerType = LAYER_TYPE_SOFTWARE; 2675 child.buildDrawingCache(true); 2676 } 2677 cache = child.getDrawingCache(true); 2678 } else { 2679 switch (layerType) { 2680 case LAYER_TYPE_SOFTWARE: 2681 child.buildDrawingCache(true); 2682 cache = child.getDrawingCache(true); 2683 break; 2684 case LAYER_TYPE_NONE: 2685 // Delay getting the display list until animation-driven alpha values are 2686 // set up and possibly passed on to the view 2687 hasDisplayList = child.canHaveDisplayList(); 2688 break; 2689 } 2690 } 2691 } 2692 2693 final boolean hasNoCache = cache == null || hasDisplayList; 2694 final boolean offsetForScroll = cache == null && !hasDisplayList && 2695 layerType != LAYER_TYPE_HARDWARE; 2696 2697 final int restoreTo = canvas.save(); 2698 if (offsetForScroll) { 2699 canvas.translate(cl - sx, ct - sy); 2700 } else { 2701 canvas.translate(cl, ct); 2702 if (scalingRequired) { 2703 // mAttachInfo cannot be null, otherwise scalingRequired == false 2704 final float scale = 1.0f / mAttachInfo.mApplicationScale; 2705 canvas.scale(scale, scale); 2706 } 2707 } 2708 2709 if (transformToApply != null || alpha < 1.0f || !child.hasIdentityMatrix()) { 2710 if (transformToApply != null || !childHasIdentityMatrix) { 2711 int transX = 0; 2712 int transY = 0; 2713 2714 if (offsetForScroll) { 2715 transX = -sx; 2716 transY = -sy; 2717 } 2718 2719 if (transformToApply != null) { 2720 if (concatMatrix) { 2721 // Undo the scroll translation, apply the transformation matrix, 2722 // then redo the scroll translate to get the correct result. 2723 canvas.translate(-transX, -transY); 2724 canvas.concat(transformToApply.getMatrix()); 2725 canvas.translate(transX, transY); 2726 mGroupFlags |= FLAG_CLEAR_TRANSFORMATION; 2727 } 2728 2729 float transformAlpha = transformToApply.getAlpha(); 2730 if (transformAlpha < 1.0f) { 2731 alpha *= transformToApply.getAlpha(); 2732 mGroupFlags |= FLAG_CLEAR_TRANSFORMATION; 2733 } 2734 } 2735 2736 if (!childHasIdentityMatrix) { 2737 canvas.translate(-transX, -transY); 2738 canvas.concat(child.getMatrix()); 2739 canvas.translate(transX, transY); 2740 } 2741 } 2742 2743 if (alpha < 1.0f) { 2744 mGroupFlags |= FLAG_CLEAR_TRANSFORMATION; 2745 if (hasNoCache) { 2746 final int multipliedAlpha = (int) (255 * alpha); 2747 if (!child.onSetAlpha(multipliedAlpha)) { 2748 int layerFlags = Canvas.HAS_ALPHA_LAYER_SAVE_FLAG; 2749 if ((flags & FLAG_CLIP_CHILDREN) == FLAG_CLIP_CHILDREN || 2750 layerType != LAYER_TYPE_NONE) { 2751 layerFlags |= Canvas.CLIP_TO_LAYER_SAVE_FLAG; 2752 } 2753 if (layerType == LAYER_TYPE_NONE) { 2754 final int scrollX = hasDisplayList ? 0 : sx; 2755 final int scrollY = hasDisplayList ? 0 : sy; 2756 canvas.saveLayerAlpha(scrollX, scrollY, scrollX + cr - cl, 2757 scrollY + cb - ct, multipliedAlpha, layerFlags); 2758 } 2759 } else { 2760 // Alpha is handled by the child directly, clobber the layer's alpha 2761 child.mPrivateFlags |= ALPHA_SET; 2762 } 2763 } 2764 } 2765 } else if ((child.mPrivateFlags & ALPHA_SET) == ALPHA_SET) { 2766 child.onSetAlpha(255); 2767 child.mPrivateFlags &= ~ALPHA_SET; 2768 } 2769 2770 if ((flags & FLAG_CLIP_CHILDREN) == FLAG_CLIP_CHILDREN) { 2771 if (offsetForScroll) { 2772 canvas.clipRect(sx, sy, sx + (cr - cl), sy + (cb - ct)); 2773 } else { 2774 if (!scalingRequired || cache == null) { 2775 canvas.clipRect(0, 0, cr - cl, cb - ct); 2776 } else { 2777 canvas.clipRect(0, 0, cache.getWidth(), cache.getHeight()); 2778 } 2779 } 2780 } 2781 2782 if (hasDisplayList) { 2783 displayList = child.getDisplayList(); 2784 } 2785 2786 if (hasNoCache) { 2787 boolean layerRendered = false; 2788 if (layerType == LAYER_TYPE_HARDWARE) { 2789 final HardwareLayer layer = child.getHardwareLayer(); 2790 if (layer != null && layer.isValid()) { 2791 child.mLayerPaint.setAlpha((int) (alpha * 255)); 2792 ((HardwareCanvas) canvas).drawHardwareLayer(layer, 0, 0, child.mLayerPaint); 2793 layerRendered = true; 2794 } else { 2795 final int scrollX = hasDisplayList ? 0 : sx; 2796 final int scrollY = hasDisplayList ? 0 : sy; 2797 canvas.saveLayer(scrollX, scrollY, 2798 scrollX + cr - cl, scrollY + cb - ct, child.mLayerPaint, 2799 Canvas.HAS_ALPHA_LAYER_SAVE_FLAG | Canvas.CLIP_TO_LAYER_SAVE_FLAG); 2800 } 2801 } 2802 2803 if (!layerRendered) { 2804 if (!hasDisplayList) { 2805 // Fast path for layouts with no backgrounds 2806 if ((child.mPrivateFlags & SKIP_DRAW) == SKIP_DRAW) { 2807 if (ViewDebug.TRACE_HIERARCHY) { 2808 ViewDebug.trace(this, ViewDebug.HierarchyTraceType.DRAW); 2809 } 2810 child.mPrivateFlags &= ~DIRTY_MASK; 2811 child.dispatchDraw(canvas); 2812 } else { 2813 child.draw(canvas); 2814 } 2815 } else { 2816 child.mPrivateFlags &= ~DIRTY_MASK; 2817 ((HardwareCanvas) canvas).drawDisplayList(displayList, cr - cl, cb - ct, null); 2818 } 2819 } 2820 } else if (cache != null) { 2821 child.mPrivateFlags &= ~DIRTY_MASK; 2822 Paint cachePaint; 2823 2824 if (layerType == LAYER_TYPE_NONE) { 2825 cachePaint = mCachePaint; 2826 if (alpha < 1.0f) { 2827 cachePaint.setAlpha((int) (alpha * 255)); 2828 mGroupFlags |= FLAG_ALPHA_LOWER_THAN_ONE; 2829 } else if ((flags & FLAG_ALPHA_LOWER_THAN_ONE) == FLAG_ALPHA_LOWER_THAN_ONE) { 2830 cachePaint.setAlpha(255); 2831 mGroupFlags &= ~FLAG_ALPHA_LOWER_THAN_ONE; 2832 } 2833 } else { 2834 cachePaint = child.mLayerPaint; 2835 cachePaint.setAlpha((int) (alpha * 255)); 2836 } 2837 canvas.drawBitmap(cache, 0.0f, 0.0f, cachePaint); 2838 } 2839 2840 canvas.restoreToCount(restoreTo); 2841 2842 if (a != null && !more) { 2843 if (!hardwareAccelerated && !a.getFillAfter()) { 2844 child.onSetAlpha(255); 2845 } 2846 finishAnimatingView(child, a); 2847 } 2848 2849 if (more && hardwareAccelerated) { 2850 // invalidation is the trigger to recreate display lists, so if we're using 2851 // display lists to render, force an invalidate to allow the animation to 2852 // continue drawing another frame 2853 invalidate(true); 2854 if (a instanceof AlphaAnimation) { 2855 // alpha animations should cause the child to recreate its display list 2856 child.invalidate(true); 2857 } 2858 } 2859 2860 child.mRecreateDisplayList = false; 2861 2862 return more; 2863 } 2864 2865 /** 2866 * 2867 * @param enabled True if children should be drawn with layers, false otherwise. 2868 * 2869 * @hide 2870 */ 2871 public void setChildrenLayersEnabled(boolean enabled) { 2872 if (enabled != mDrawLayers) { 2873 mDrawLayers = enabled; 2874 invalidate(true); 2875 2876 // We need to invalidate any child with a layer. For instance, 2877 // if a child is backed by a hardware layer and we disable layers 2878 // the child is marked as not dirty (flags cleared the last time 2879 // the child was drawn inside its layer.) However, that child might 2880 // never have created its own display list or have an obsolete 2881 // display list. By invalidating the child we ensure the display 2882 // list is in sync with the content of the hardware layer. 2883 for (int i = 0; i < mChildrenCount; i++) { 2884 View child = mChildren[i]; 2885 if (child.mLayerType != LAYER_TYPE_NONE) { 2886 child.invalidate(true); 2887 } 2888 } 2889 } 2890 } 2891 2892 /** 2893 * By default, children are clipped to their bounds before drawing. This 2894 * allows view groups to override this behavior for animations, etc. 2895 * 2896 * @param clipChildren true to clip children to their bounds, 2897 * false otherwise 2898 * @attr ref android.R.styleable#ViewGroup_clipChildren 2899 */ 2900 public void setClipChildren(boolean clipChildren) { 2901 setBooleanFlag(FLAG_CLIP_CHILDREN, clipChildren); 2902 } 2903 2904 /** 2905 * By default, children are clipped to the padding of the ViewGroup. This 2906 * allows view groups to override this behavior 2907 * 2908 * @param clipToPadding true to clip children to the padding of the 2909 * group, false otherwise 2910 * @attr ref android.R.styleable#ViewGroup_clipToPadding 2911 */ 2912 public void setClipToPadding(boolean clipToPadding) { 2913 setBooleanFlag(FLAG_CLIP_TO_PADDING, clipToPadding); 2914 } 2915 2916 /** 2917 * {@inheritDoc} 2918 */ 2919 @Override 2920 public void dispatchSetSelected(boolean selected) { 2921 final View[] children = mChildren; 2922 final int count = mChildrenCount; 2923 for (int i = 0; i < count; i++) { 2924 children[i].setSelected(selected); 2925 } 2926 } 2927 2928 /** 2929 * {@inheritDoc} 2930 */ 2931 @Override 2932 public void dispatchSetActivated(boolean activated) { 2933 final View[] children = mChildren; 2934 final int count = mChildrenCount; 2935 for (int i = 0; i < count; i++) { 2936 children[i].setActivated(activated); 2937 } 2938 } 2939 2940 @Override 2941 protected void dispatchSetPressed(boolean pressed) { 2942 final View[] children = mChildren; 2943 final int count = mChildrenCount; 2944 for (int i = 0; i < count; i++) { 2945 children[i].setPressed(pressed); 2946 } 2947 } 2948 2949 /** 2950 * When this property is set to true, this ViewGroup supports static transformations on 2951 * children; this causes 2952 * {@link #getChildStaticTransformation(View, android.view.animation.Transformation)} to be 2953 * invoked when a child is drawn. 2954 * 2955 * Any subclass overriding 2956 * {@link #getChildStaticTransformation(View, android.view.animation.Transformation)} should 2957 * set this property to true. 2958 * 2959 * @param enabled True to enable static transformations on children, false otherwise. 2960 * 2961 * @see #FLAG_SUPPORT_STATIC_TRANSFORMATIONS 2962 */ 2963 protected void setStaticTransformationsEnabled(boolean enabled) { 2964 setBooleanFlag(FLAG_SUPPORT_STATIC_TRANSFORMATIONS, enabled); 2965 } 2966 2967 /** 2968 * {@inheritDoc} 2969 * 2970 * @see #setStaticTransformationsEnabled(boolean) 2971 */ 2972 protected boolean getChildStaticTransformation(View child, Transformation t) { 2973 return false; 2974 } 2975 2976 /** 2977 * {@hide} 2978 */ 2979 @Override 2980 protected View findViewTraversal(int id) { 2981 if (id == mID) { 2982 return this; 2983 } 2984 2985 final View[] where = mChildren; 2986 final int len = mChildrenCount; 2987 2988 for (int i = 0; i < len; i++) { 2989 View v = where[i]; 2990 2991 if ((v.mPrivateFlags & IS_ROOT_NAMESPACE) == 0) { 2992 v = v.findViewById(id); 2993 2994 if (v != null) { 2995 return v; 2996 } 2997 } 2998 } 2999 3000 return null; 3001 } 3002 3003 /** 3004 * {@hide} 3005 */ 3006 @Override 3007 protected View findViewWithTagTraversal(Object tag) { 3008 if (tag != null && tag.equals(mTag)) { 3009 return this; 3010 } 3011 3012 final View[] where = mChildren; 3013 final int len = mChildrenCount; 3014 3015 for (int i = 0; i < len; i++) { 3016 View v = where[i]; 3017 3018 if ((v.mPrivateFlags & IS_ROOT_NAMESPACE) == 0) { 3019 v = v.findViewWithTag(tag); 3020 3021 if (v != null) { 3022 return v; 3023 } 3024 } 3025 } 3026 3027 return null; 3028 } 3029 3030 /** 3031 * {@hide} 3032 */ 3033 @Override 3034 protected View findViewByPredicateTraversal(Predicate<View> predicate) { 3035 if (predicate.apply(this)) { 3036 return this; 3037 } 3038 3039 final View[] where = mChildren; 3040 final int len = mChildrenCount; 3041 3042 for (int i = 0; i < len; i++) { 3043 View v = where[i]; 3044 3045 if ((v.mPrivateFlags & IS_ROOT_NAMESPACE) == 0) { 3046 v = v.findViewByPredicate(predicate); 3047 3048 if (v != null) { 3049 return v; 3050 } 3051 } 3052 } 3053 3054 return null; 3055 } 3056 3057 /** 3058 * Adds a child view. If no layout parameters are already set on the child, the 3059 * default parameters for this ViewGroup are set on the child. 3060 * 3061 * @param child the child view to add 3062 * 3063 * @see #generateDefaultLayoutParams() 3064 */ 3065 public void addView(View child) { 3066 addView(child, -1); 3067 } 3068 3069 /** 3070 * Adds a child view. If no layout parameters are already set on the child, the 3071 * default parameters for this ViewGroup are set on the child. 3072 * 3073 * @param child the child view to add 3074 * @param index the position at which to add the child 3075 * 3076 * @see #generateDefaultLayoutParams() 3077 */ 3078 public void addView(View child, int index) { 3079 LayoutParams params = child.getLayoutParams(); 3080 if (params == null) { 3081 params = generateDefaultLayoutParams(); 3082 if (params == null) { 3083 throw new IllegalArgumentException("generateDefaultLayoutParams() cannot return null"); 3084 } 3085 } 3086 addView(child, index, params); 3087 } 3088 3089 /** 3090 * Adds a child view with this ViewGroup's default layout parameters and the 3091 * specified width and height. 3092 * 3093 * @param child the child view to add 3094 */ 3095 public void addView(View child, int width, int height) { 3096 final LayoutParams params = generateDefaultLayoutParams(); 3097 params.width = width; 3098 params.height = height; 3099 addView(child, -1, params); 3100 } 3101 3102 /** 3103 * Adds a child view with the specified layout parameters. 3104 * 3105 * @param child the child view to add 3106 * @param params the layout parameters to set on the child 3107 */ 3108 public void addView(View child, LayoutParams params) { 3109 addView(child, -1, params); 3110 } 3111 3112 /** 3113 * Adds a child view with the specified layout parameters. 3114 * 3115 * @param child the child view to add 3116 * @param index the position at which to add the child 3117 * @param params the layout parameters to set on the child 3118 */ 3119 public void addView(View child, int index, LayoutParams params) { 3120 if (DBG) { 3121 System.out.println(this + " addView"); 3122 } 3123 3124 // addViewInner() will call child.requestLayout() when setting the new LayoutParams 3125 // therefore, we call requestLayout() on ourselves before, so that the child's request 3126 // will be blocked at our level 3127 requestLayout(); 3128 invalidate(true); 3129 addViewInner(child, index, params, false); 3130 } 3131 3132 /** 3133 * {@inheritDoc} 3134 */ 3135 public void updateViewLayout(View view, ViewGroup.LayoutParams params) { 3136 if (!checkLayoutParams(params)) { 3137 throw new IllegalArgumentException("Invalid LayoutParams supplied to " + this); 3138 } 3139 if (view.mParent != this) { 3140 throw new IllegalArgumentException("Given view not a child of " + this); 3141 } 3142 view.setLayoutParams(params); 3143 } 3144 3145 /** 3146 * {@inheritDoc} 3147 */ 3148 protected boolean checkLayoutParams(ViewGroup.LayoutParams p) { 3149 return p != null; 3150 } 3151 3152 /** 3153 * Interface definition for a callback to be invoked when the hierarchy 3154 * within this view changed. The hierarchy changes whenever a child is added 3155 * to or removed from this view. 3156 */ 3157 public interface OnHierarchyChangeListener { 3158 /** 3159 * Called when a new child is added to a parent view. 3160 * 3161 * @param parent the view in which a child was added 3162 * @param child the new child view added in the hierarchy 3163 */ 3164 void onChildViewAdded(View parent, View child); 3165 3166 /** 3167 * Called when a child is removed from a parent view. 3168 * 3169 * @param parent the view from which the child was removed 3170 * @param child the child removed from the hierarchy 3171 */ 3172 void onChildViewRemoved(View parent, View child); 3173 } 3174 3175 /** 3176 * Register a callback to be invoked when a child is added to or removed 3177 * from this view. 3178 * 3179 * @param listener the callback to invoke on hierarchy change 3180 */ 3181 public void setOnHierarchyChangeListener(OnHierarchyChangeListener listener) { 3182 mOnHierarchyChangeListener = listener; 3183 } 3184 3185 /** 3186 * @hide 3187 */ 3188 protected void onViewAdded(View child) { 3189 if (mOnHierarchyChangeListener != null) { 3190 mOnHierarchyChangeListener.onChildViewAdded(this, child); 3191 } 3192 } 3193 3194 /** 3195 * @hide 3196 */ 3197 protected void onViewRemoved(View child) { 3198 if (mOnHierarchyChangeListener != null) { 3199 mOnHierarchyChangeListener.onChildViewRemoved(this, child); 3200 } 3201 } 3202 3203 /** 3204 * Adds a view during layout. This is useful if in your onLayout() method, 3205 * you need to add more views (as does the list view for example). 3206 * 3207 * If index is negative, it means put it at the end of the list. 3208 * 3209 * @param child the view to add to the group 3210 * @param index the index at which the child must be added 3211 * @param params the layout parameters to associate with the child 3212 * @return true if the child was added, false otherwise 3213 */ 3214 protected boolean addViewInLayout(View child, int index, LayoutParams params) { 3215 return addViewInLayout(child, index, params, false); 3216 } 3217 3218 /** 3219 * Adds a view during layout. This is useful if in your onLayout() method, 3220 * you need to add more views (as does the list view for example). 3221 * 3222 * If index is negative, it means put it at the end of the list. 3223 * 3224 * @param child the view to add to the group 3225 * @param index the index at which the child must be added 3226 * @param params the layout parameters to associate with the child 3227 * @param preventRequestLayout if true, calling this method will not trigger a 3228 * layout request on child 3229 * @return true if the child was added, false otherwise 3230 */ 3231 protected boolean addViewInLayout(View child, int index, LayoutParams params, 3232 boolean preventRequestLayout) { 3233 child.mParent = null; 3234 addViewInner(child, index, params, preventRequestLayout); 3235 child.mPrivateFlags = (child.mPrivateFlags & ~DIRTY_MASK) | DRAWN; 3236 return true; 3237 } 3238 3239 /** 3240 * Prevents the specified child to be laid out during the next layout pass. 3241 * 3242 * @param child the child on which to perform the cleanup 3243 */ 3244 protected void cleanupLayoutState(View child) { 3245 child.mPrivateFlags &= ~View.FORCE_LAYOUT; 3246 } 3247 3248 private void addViewInner(View child, int index, LayoutParams params, 3249 boolean preventRequestLayout) { 3250 3251 if (mTransition != null) { 3252 // Don't prevent other add transitions from completing, but cancel remove 3253 // transitions to let them complete the process before we add to the container 3254 mTransition.cancel(LayoutTransition.DISAPPEARING); 3255 } 3256 3257 if (child.getParent() != null) { 3258 throw new IllegalStateException("The specified child already has a parent. " + 3259 "You must call removeView() on the child's parent first."); 3260 } 3261 3262 if (mTransition != null) { 3263 mTransition.addChild(this, child); 3264 } 3265 3266 if (!checkLayoutParams(params)) { 3267 params = generateLayoutParams(params); 3268 } 3269 3270 if (preventRequestLayout) { 3271 child.mLayoutParams = params; 3272 } else { 3273 child.setLayoutParams(params); 3274 } 3275 3276 if (index < 0) { 3277 index = mChildrenCount; 3278 } 3279 3280 addInArray(child, index); 3281 3282 // tell our children 3283 if (preventRequestLayout) { 3284 child.assignParent(this); 3285 } else { 3286 child.mParent = this; 3287 } 3288 3289 if (child.hasFocus()) { 3290 requestChildFocus(child, child.findFocus()); 3291 } 3292 3293 AttachInfo ai = mAttachInfo; 3294 if (ai != null) { 3295 boolean lastKeepOn = ai.mKeepScreenOn; 3296 ai.mKeepScreenOn = false; 3297 child.dispatchAttachedToWindow(mAttachInfo, (mViewFlags&VISIBILITY_MASK)); 3298 if (ai.mKeepScreenOn) { 3299 needGlobalAttributesUpdate(true); 3300 } 3301 ai.mKeepScreenOn = lastKeepOn; 3302 } 3303 3304 onViewAdded(child); 3305 3306 if ((child.mViewFlags & DUPLICATE_PARENT_STATE) == DUPLICATE_PARENT_STATE) { 3307 mGroupFlags |= FLAG_NOTIFY_CHILDREN_ON_DRAWABLE_STATE_CHANGE; 3308 } 3309 } 3310 3311 private void addInArray(View child, int index) { 3312 View[] children = mChildren; 3313 final int count = mChildrenCount; 3314 final int size = children.length; 3315 if (index == count) { 3316 if (size == count) { 3317 mChildren = new View[size + ARRAY_CAPACITY_INCREMENT]; 3318 System.arraycopy(children, 0, mChildren, 0, size); 3319 children = mChildren; 3320 } 3321 children[mChildrenCount++] = child; 3322 } else if (index < count) { 3323 if (size == count) { 3324 mChildren = new View[size + ARRAY_CAPACITY_INCREMENT]; 3325 System.arraycopy(children, 0, mChildren, 0, index); 3326 System.arraycopy(children, index, mChildren, index + 1, count - index); 3327 children = mChildren; 3328 } else { 3329 System.arraycopy(children, index, children, index + 1, count - index); 3330 } 3331 children[index] = child; 3332 mChildrenCount++; 3333 if (mLastTouchDownIndex >= index) { 3334 mLastTouchDownIndex++; 3335 } 3336 } else { 3337 throw new IndexOutOfBoundsException("index=" + index + " count=" + count); 3338 } 3339 } 3340 3341 // This method also sets the child's mParent to null 3342 private void removeFromArray(int index) { 3343 final View[] children = mChildren; 3344 if (!(mTransitioningViews != null && mTransitioningViews.contains(children[index]))) { 3345 children[index].mParent = null; 3346 } 3347 final int count = mChildrenCount; 3348 if (index == count - 1) { 3349 children[--mChildrenCount] = null; 3350 } else if (index >= 0 && index < count) { 3351 System.arraycopy(children, index + 1, children, index, count - index - 1); 3352 children[--mChildrenCount] = null; 3353 } else { 3354 throw new IndexOutOfBoundsException(); 3355 } 3356 if (mLastTouchDownIndex == index) { 3357 mLastTouchDownTime = 0; 3358 mLastTouchDownIndex = -1; 3359 } else if (mLastTouchDownIndex > index) { 3360 mLastTouchDownIndex--; 3361 } 3362 } 3363 3364 // This method also sets the children's mParent to null 3365 private void removeFromArray(int start, int count) { 3366 final View[] children = mChildren; 3367 final int childrenCount = mChildrenCount; 3368 3369 start = Math.max(0, start); 3370 final int end = Math.min(childrenCount, start + count); 3371 3372 if (start == end) { 3373 return; 3374 } 3375 3376 if (end == childrenCount) { 3377 for (int i = start; i < end; i++) { 3378 children[i].mParent = null; 3379 children[i] = null; 3380 } 3381 } else { 3382 for (int i = start; i < end; i++) { 3383 children[i].mParent = null; 3384 } 3385 3386 // Since we're looping above, we might as well do the copy, but is arraycopy() 3387 // faster than the extra 2 bounds checks we would do in the loop? 3388 System.arraycopy(children, end, children, start, childrenCount - end); 3389 3390 for (int i = childrenCount - (end - start); i < childrenCount; i++) { 3391 children[i] = null; 3392 } 3393 } 3394 3395 mChildrenCount -= (end - start); 3396 } 3397 3398 private void bindLayoutAnimation(View child) { 3399 Animation a = mLayoutAnimationController.getAnimationForView(child); 3400 child.setAnimation(a); 3401 } 3402 3403 /** 3404 * Subclasses should override this method to set layout animation 3405 * parameters on the supplied child. 3406 * 3407 * @param child the child to associate with animation parameters 3408 * @param params the child's layout parameters which hold the animation 3409 * parameters 3410 * @param index the index of the child in the view group 3411 * @param count the number of children in the view group 3412 */ 3413 protected void attachLayoutAnimationParameters(View child, 3414 LayoutParams params, int index, int count) { 3415 LayoutAnimationController.AnimationParameters animationParams = 3416 params.layoutAnimationParameters; 3417 if (animationParams == null) { 3418 animationParams = new LayoutAnimationController.AnimationParameters(); 3419 params.layoutAnimationParameters = animationParams; 3420 } 3421 3422 animationParams.count = count; 3423 animationParams.index = index; 3424 } 3425 3426 /** 3427 * {@inheritDoc} 3428 */ 3429 public void removeView(View view) { 3430 removeViewInternal(view); 3431 requestLayout(); 3432 invalidate(true); 3433 } 3434 3435 /** 3436 * Removes a view during layout. This is useful if in your onLayout() method, 3437 * you need to remove more views. 3438 * 3439 * @param view the view to remove from the group 3440 */ 3441 public void removeViewInLayout(View view) { 3442 removeViewInternal(view); 3443 } 3444 3445 /** 3446 * Removes a range of views during layout. This is useful if in your onLayout() method, 3447 * you need to remove more views. 3448 * 3449 * @param start the index of the first view to remove from the group 3450 * @param count the number of views to remove from the group 3451 */ 3452 public void removeViewsInLayout(int start, int count) { 3453 removeViewsInternal(start, count); 3454 } 3455 3456 /** 3457 * Removes the view at the specified position in the group. 3458 * 3459 * @param index the position in the group of the view to remove 3460 */ 3461 public void removeViewAt(int index) { 3462 removeViewInternal(index, getChildAt(index)); 3463 requestLayout(); 3464 invalidate(true); 3465 } 3466 3467 /** 3468 * Removes the specified range of views from the group. 3469 * 3470 * @param start the first position in the group of the range of views to remove 3471 * @param count the number of views to remove 3472 */ 3473 public void removeViews(int start, int count) { 3474 removeViewsInternal(start, count); 3475 requestLayout(); 3476 invalidate(true); 3477 } 3478 3479 private void removeViewInternal(View view) { 3480 final int index = indexOfChild(view); 3481 if (index >= 0) { 3482 removeViewInternal(index, view); 3483 } 3484 } 3485 3486 private void removeViewInternal(int index, View view) { 3487 3488 if (mTransition != null) { 3489 mTransition.removeChild(this, view); 3490 } 3491 3492 boolean clearChildFocus = false; 3493 if (view == mFocused) { 3494 view.clearFocusForRemoval(); 3495 clearChildFocus = true; 3496 } 3497 3498 if (view.getAnimation() != null || 3499 (mTransitioningViews != null && mTransitioningViews.contains(view))) { 3500 addDisappearingView(view); 3501 } else if (view.mAttachInfo != null) { 3502 view.dispatchDetachedFromWindow(); 3503 } 3504 3505 onViewRemoved(view); 3506 3507 needGlobalAttributesUpdate(false); 3508 3509 removeFromArray(index); 3510 3511 if (clearChildFocus) { 3512 clearChildFocus(view); 3513 } 3514 } 3515 3516 /** 3517 * Sets the LayoutTransition object for this ViewGroup. If the LayoutTransition object is 3518 * not null, changes in layout which occur because of children being added to or removed from 3519 * the ViewGroup will be animated according to the animations defined in that LayoutTransition 3520 * object. By default, the transition object is null (so layout changes are not animated). 3521 * 3522 * @param transition The LayoutTransition object that will animated changes in layout. A value 3523 * of <code>null</code> means no transition will run on layout changes. 3524 * @attr ref android.R.styleable#ViewGroup_animateLayoutChanges 3525 */ 3526 public void setLayoutTransition(LayoutTransition transition) { 3527 if (mTransition != null) { 3528 mTransition.removeTransitionListener(mLayoutTransitionListener); 3529 } 3530 mTransition = transition; 3531 if (mTransition != null) { 3532 mTransition.addTransitionListener(mLayoutTransitionListener); 3533 } 3534 } 3535 3536 /** 3537 * Gets the LayoutTransition object for this ViewGroup. If the LayoutTransition object is 3538 * not null, changes in layout which occur because of children being added to or removed from 3539 * the ViewGroup will be animated according to the animations defined in that LayoutTransition 3540 * object. By default, the transition object is null (so layout changes are not animated). 3541 * 3542 * @return LayoutTranstion The LayoutTransition object that will animated changes in layout. 3543 * A value of <code>null</code> means no transition will run on layout changes. 3544 */ 3545 public LayoutTransition getLayoutTransition() { 3546 return mTransition; 3547 } 3548 3549 private void removeViewsInternal(int start, int count) { 3550 final View focused = mFocused; 3551 final boolean detach = mAttachInfo != null; 3552 View clearChildFocus = null; 3553 3554 final View[] children = mChildren; 3555 final int end = start + count; 3556 3557 for (int i = start; i < end; i++) { 3558 final View view = children[i]; 3559 3560 if (mTransition != null) { 3561 mTransition.removeChild(this, view); 3562 } 3563 3564 if (view == focused) { 3565 view.clearFocusForRemoval(); 3566 clearChildFocus = view; 3567 } 3568 3569 if (view.getAnimation() != null || 3570 (mTransitioningViews != null && mTransitioningViews.contains(view))) { 3571 addDisappearingView(view); 3572 } else if (detach) { 3573 view.dispatchDetachedFromWindow(); 3574 } 3575 3576 needGlobalAttributesUpdate(false); 3577 3578 onViewRemoved(view); 3579 } 3580 3581 removeFromArray(start, count); 3582 3583 if (clearChildFocus != null) { 3584 clearChildFocus(clearChildFocus); 3585 } 3586 } 3587 3588 /** 3589 * Call this method to remove all child views from the 3590 * ViewGroup. 3591 */ 3592 public void removeAllViews() { 3593 removeAllViewsInLayout(); 3594 requestLayout(); 3595 invalidate(true); 3596 } 3597 3598 /** 3599 * Called by a ViewGroup subclass to remove child views from itself, 3600 * when it must first know its size on screen before it can calculate how many 3601 * child views it will render. An example is a Gallery or a ListView, which 3602 * may "have" 50 children, but actually only render the number of children 3603 * that can currently fit inside the object on screen. Do not call 3604 * this method unless you are extending ViewGroup and understand the 3605 * view measuring and layout pipeline. 3606 */ 3607 public void removeAllViewsInLayout() { 3608 final int count = mChildrenCount; 3609 if (count <= 0) { 3610 return; 3611 } 3612 3613 final View[] children = mChildren; 3614 mChildrenCount = 0; 3615 3616 final View focused = mFocused; 3617 final boolean detach = mAttachInfo != null; 3618 View clearChildFocus = null; 3619 3620 needGlobalAttributesUpdate(false); 3621 3622 for (int i = count - 1; i >= 0; i--) { 3623 final View view = children[i]; 3624 3625 if (mTransition != null) { 3626 mTransition.removeChild(this, view); 3627 } 3628 3629 if (view == focused) { 3630 view.clearFocusForRemoval(); 3631 clearChildFocus = view; 3632 } 3633 3634 if (view.getAnimation() != null || 3635 (mTransitioningViews != null && mTransitioningViews.contains(view))) { 3636 addDisappearingView(view); 3637 } else if (detach) { 3638 view.dispatchDetachedFromWindow(); 3639 } 3640 3641 onViewRemoved(view); 3642 3643 view.mParent = null; 3644 children[i] = null; 3645 } 3646 3647 if (clearChildFocus != null) { 3648 clearChildFocus(clearChildFocus); 3649 } 3650 } 3651 3652 /** 3653 * Finishes the removal of a detached view. This method will dispatch the detached from 3654 * window event and notify the hierarchy change listener. 3655 * 3656 * @param child the child to be definitely removed from the view hierarchy 3657 * @param animate if true and the view has an animation, the view is placed in the 3658 * disappearing views list, otherwise, it is detached from the window 3659 * 3660 * @see #attachViewToParent(View, int, android.view.ViewGroup.LayoutParams) 3661 * @see #detachAllViewsFromParent() 3662 * @see #detachViewFromParent(View) 3663 * @see #detachViewFromParent(int) 3664 */ 3665 protected void removeDetachedView(View child, boolean animate) { 3666 if (mTransition != null) { 3667 mTransition.removeChild(this, child); 3668 } 3669 3670 if (child == mFocused) { 3671 child.clearFocus(); 3672 } 3673 3674 if ((animate && child.getAnimation() != null) || 3675 (mTransitioningViews != null && mTransitioningViews.contains(child))) { 3676 addDisappearingView(child); 3677 } else if (child.mAttachInfo != null) { 3678 child.dispatchDetachedFromWindow(); 3679 } 3680 3681 onViewRemoved(child); 3682 } 3683 3684 /** 3685 * Attaches a view to this view group. Attaching a view assigns this group as the parent, 3686 * sets the layout parameters and puts the view in the list of children so it can be retrieved 3687 * by calling {@link #getChildAt(int)}. 3688 * 3689 * This method should be called only for view which were detached from their parent. 3690 * 3691 * @param child the child to attach 3692 * @param index the index at which the child should be attached 3693 * @param params the layout parameters of the child 3694 * 3695 * @see #removeDetachedView(View, boolean) 3696 * @see #detachAllViewsFromParent() 3697 * @see #detachViewFromParent(View) 3698 * @see #detachViewFromParent(int) 3699 */ 3700 protected void attachViewToParent(View child, int index, LayoutParams params) { 3701 child.mLayoutParams = params; 3702 3703 if (index < 0) { 3704 index = mChildrenCount; 3705 } 3706 3707 addInArray(child, index); 3708 3709 child.mParent = this; 3710 child.mPrivateFlags = (child.mPrivateFlags & ~DIRTY_MASK & ~DRAWING_CACHE_VALID) | 3711 DRAWN | INVALIDATED; 3712 this.mPrivateFlags |= INVALIDATED; 3713 3714 if (child.hasFocus()) { 3715 requestChildFocus(child, child.findFocus()); 3716 } 3717 } 3718 3719 /** 3720 * Detaches a view from its parent. Detaching a view should be temporary and followed 3721 * either by a call to {@link #attachViewToParent(View, int, android.view.ViewGroup.LayoutParams)} 3722 * or a call to {@link #removeDetachedView(View, boolean)}. When a view is detached, 3723 * its parent is null and cannot be retrieved by a call to {@link #getChildAt(int)}. 3724 * 3725 * @param child the child to detach 3726 * 3727 * @see #detachViewFromParent(int) 3728 * @see #detachViewsFromParent(int, int) 3729 * @see #detachAllViewsFromParent() 3730 * @see #attachViewToParent(View, int, android.view.ViewGroup.LayoutParams) 3731 * @see #removeDetachedView(View, boolean) 3732 */ 3733 protected void detachViewFromParent(View child) { 3734 removeFromArray(indexOfChild(child)); 3735 } 3736 3737 /** 3738 * Detaches a view from its parent. Detaching a view should be temporary and followed 3739 * either by a call to {@link #attachViewToParent(View, int, android.view.ViewGroup.LayoutParams)} 3740 * or a call to {@link #removeDetachedView(View, boolean)}. When a view is detached, 3741 * its parent is null and cannot be retrieved by a call to {@link #getChildAt(int)}. 3742 * 3743 * @param index the index of the child to detach 3744 * 3745 * @see #detachViewFromParent(View) 3746 * @see #detachAllViewsFromParent() 3747 * @see #detachViewsFromParent(int, int) 3748 * @see #attachViewToParent(View, int, android.view.ViewGroup.LayoutParams) 3749 * @see #removeDetachedView(View, boolean) 3750 */ 3751 protected void detachViewFromParent(int index) { 3752 removeFromArray(index); 3753 } 3754 3755 /** 3756 * Detaches a range of view from their parent. Detaching a view should be temporary and followed 3757 * either by a call to {@link #attachViewToParent(View, int, android.view.ViewGroup.LayoutParams)} 3758 * or a call to {@link #removeDetachedView(View, boolean)}. When a view is detached, its 3759 * parent is null and cannot be retrieved by a call to {@link #getChildAt(int)}. 3760 * 3761 * @param start the first index of the childrend range to detach 3762 * @param count the number of children to detach 3763 * 3764 * @see #detachViewFromParent(View) 3765 * @see #detachViewFromParent(int) 3766 * @see #detachAllViewsFromParent() 3767 * @see #attachViewToParent(View, int, android.view.ViewGroup.LayoutParams) 3768 * @see #removeDetachedView(View, boolean) 3769 */ 3770 protected void detachViewsFromParent(int start, int count) { 3771 removeFromArray(start, count); 3772 } 3773 3774 /** 3775 * Detaches all views from the parent. Detaching a view should be temporary and followed 3776 * either by a call to {@link #attachViewToParent(View, int, android.view.ViewGroup.LayoutParams)} 3777 * or a call to {@link #removeDetachedView(View, boolean)}. When a view is detached, 3778 * its parent is null and cannot be retrieved by a call to {@link #getChildAt(int)}. 3779 * 3780 * @see #detachViewFromParent(View) 3781 * @see #detachViewFromParent(int) 3782 * @see #detachViewsFromParent(int, int) 3783 * @see #attachViewToParent(View, int, android.view.ViewGroup.LayoutParams) 3784 * @see #removeDetachedView(View, boolean) 3785 */ 3786 protected void detachAllViewsFromParent() { 3787 final int count = mChildrenCount; 3788 if (count <= 0) { 3789 return; 3790 } 3791 3792 final View[] children = mChildren; 3793 mChildrenCount = 0; 3794 3795 for (int i = count - 1; i >= 0; i--) { 3796 children[i].mParent = null; 3797 children[i] = null; 3798 } 3799 } 3800 3801 /** 3802 * Don't call or override this method. It is used for the implementation of 3803 * the view hierarchy. 3804 */ 3805 public final void invalidateChild(View child, final Rect dirty) { 3806 if (ViewDebug.TRACE_HIERARCHY) { 3807 ViewDebug.trace(this, ViewDebug.HierarchyTraceType.INVALIDATE_CHILD); 3808 } 3809 3810 ViewParent parent = this; 3811 3812 final AttachInfo attachInfo = mAttachInfo; 3813 if (attachInfo != null) { 3814 // If the child is drawing an animation, we want to copy this flag onto 3815 // ourselves and the parent to make sure the invalidate request goes 3816 // through 3817 final boolean drawAnimation = (child.mPrivateFlags & DRAW_ANIMATION) == DRAW_ANIMATION; 3818 3819 if (dirty == null) { 3820 if (child.mLayerType != LAYER_TYPE_NONE) { 3821 mPrivateFlags |= INVALIDATED; 3822 mPrivateFlags &= ~DRAWING_CACHE_VALID; 3823 child.mLocalDirtyRect.setEmpty(); 3824 } 3825 do { 3826 View view = null; 3827 if (parent instanceof View) { 3828 view = (View) parent; 3829 if (view.mLayerType != LAYER_TYPE_NONE) { 3830 view.mLocalDirtyRect.setEmpty(); 3831 if (view.getParent() instanceof View) { 3832 final View grandParent = (View) view.getParent(); 3833 grandParent.mPrivateFlags |= INVALIDATED; 3834 grandParent.mPrivateFlags &= ~DRAWING_CACHE_VALID; 3835 } 3836 } 3837 if ((view.mPrivateFlags & DIRTY_MASK) != 0) { 3838 // already marked dirty - we're done 3839 break; 3840 } 3841 } 3842 3843 if (drawAnimation) { 3844 if (view != null) { 3845 view.mPrivateFlags |= DRAW_ANIMATION; 3846 } else if (parent instanceof ViewRootImpl) { 3847 ((ViewRootImpl) parent).mIsAnimating = true; 3848 } 3849 } 3850 3851 if (parent instanceof ViewRootImpl) { 3852 ((ViewRootImpl) parent).invalidate(); 3853 parent = null; 3854 } else if (view != null) { 3855 if ((view.mPrivateFlags & DRAWN) == DRAWN || 3856 (view.mPrivateFlags & DRAWING_CACHE_VALID) == DRAWING_CACHE_VALID) { 3857 view.mPrivateFlags &= ~DRAWING_CACHE_VALID; 3858 view.mPrivateFlags |= DIRTY; 3859 parent = view.mParent; 3860 } else { 3861 parent = null; 3862 } 3863 } 3864 } while (parent != null); 3865 } else { 3866 // Check whether the child that requests the invalidate is fully opaque 3867 final boolean isOpaque = child.isOpaque() && !drawAnimation && 3868 child.getAnimation() == null; 3869 // Mark the child as dirty, using the appropriate flag 3870 // Make sure we do not set both flags at the same time 3871 int opaqueFlag = isOpaque ? DIRTY_OPAQUE : DIRTY; 3872 3873 if (child.mLayerType != LAYER_TYPE_NONE) { 3874 mPrivateFlags |= INVALIDATED; 3875 mPrivateFlags &= ~DRAWING_CACHE_VALID; 3876 child.mLocalDirtyRect.union(dirty); 3877 } 3878 3879 final int[] location = attachInfo.mInvalidateChildLocation; 3880 location[CHILD_LEFT_INDEX] = child.mLeft; 3881 location[CHILD_TOP_INDEX] = child.mTop; 3882 Matrix childMatrix = child.getMatrix(); 3883 if (!childMatrix.isIdentity()) { 3884 RectF boundingRect = attachInfo.mTmpTransformRect; 3885 boundingRect.set(dirty); 3886 //boundingRect.inset(-0.5f, -0.5f); 3887 childMatrix.mapRect(boundingRect); 3888 dirty.set((int) (boundingRect.left - 0.5f), 3889 (int) (boundingRect.top - 0.5f), 3890 (int) (boundingRect.right + 0.5f), 3891 (int) (boundingRect.bottom + 0.5f)); 3892 } 3893 3894 do { 3895 View view = null; 3896 if (parent instanceof View) { 3897 view = (View) parent; 3898 if (view.mLayerType != LAYER_TYPE_NONE && 3899 view.getParent() instanceof View) { 3900 final View grandParent = (View) view.getParent(); 3901 grandParent.mPrivateFlags |= INVALIDATED; 3902 grandParent.mPrivateFlags &= ~DRAWING_CACHE_VALID; 3903 } 3904 } 3905 3906 if (drawAnimation) { 3907 if (view != null) { 3908 view.mPrivateFlags |= DRAW_ANIMATION; 3909 } else if (parent instanceof ViewRootImpl) { 3910 ((ViewRootImpl) parent).mIsAnimating = true; 3911 } 3912 } 3913 3914 // If the parent is dirty opaque or not dirty, mark it dirty with the opaque 3915 // flag coming from the child that initiated the invalidate 3916 if (view != null) { 3917 if ((view.mViewFlags & FADING_EDGE_MASK) != 0 && 3918 view.getSolidColor() == 0) { 3919 opaqueFlag = DIRTY; 3920 } 3921 if ((view.mPrivateFlags & DIRTY_MASK) != DIRTY) { 3922 view.mPrivateFlags = (view.mPrivateFlags & ~DIRTY_MASK) | opaqueFlag; 3923 } 3924 } 3925 3926 parent = parent.invalidateChildInParent(location, dirty); 3927 if (view != null) { 3928 // Account for transform on current parent 3929 Matrix m = view.getMatrix(); 3930 if (!m.isIdentity()) { 3931 RectF boundingRect = attachInfo.mTmpTransformRect; 3932 boundingRect.set(dirty); 3933 m.mapRect(boundingRect); 3934 dirty.set((int) boundingRect.left, (int) boundingRect.top, 3935 (int) (boundingRect.right + 0.5f), 3936 (int) (boundingRect.bottom + 0.5f)); 3937 } 3938 } 3939 } while (parent != null); 3940 } 3941 } 3942 } 3943 3944 /** 3945 * Don't call or override this method. It is used for the implementation of 3946 * the view hierarchy. 3947 * 3948 * This implementation returns null if this ViewGroup does not have a parent, 3949 * if this ViewGroup is already fully invalidated or if the dirty rectangle 3950 * does not intersect with this ViewGroup's bounds. 3951 */ 3952 public ViewParent invalidateChildInParent(final int[] location, final Rect dirty) { 3953 if (ViewDebug.TRACE_HIERARCHY) { 3954 ViewDebug.trace(this, ViewDebug.HierarchyTraceType.INVALIDATE_CHILD_IN_PARENT); 3955 } 3956 3957 if ((mPrivateFlags & DRAWN) == DRAWN || 3958 (mPrivateFlags & DRAWING_CACHE_VALID) == DRAWING_CACHE_VALID) { 3959 if ((mGroupFlags & (FLAG_OPTIMIZE_INVALIDATE | FLAG_ANIMATION_DONE)) != 3960 FLAG_OPTIMIZE_INVALIDATE) { 3961 dirty.offset(location[CHILD_LEFT_INDEX] - mScrollX, 3962 location[CHILD_TOP_INDEX] - mScrollY); 3963 3964 final int left = mLeft; 3965 final int top = mTop; 3966 3967 if ((mGroupFlags & FLAG_CLIP_CHILDREN) != FLAG_CLIP_CHILDREN || 3968 dirty.intersect(0, 0, mRight - left, mBottom - top) || 3969 (mPrivateFlags & DRAW_ANIMATION) == DRAW_ANIMATION) { 3970 mPrivateFlags &= ~DRAWING_CACHE_VALID; 3971 3972 location[CHILD_LEFT_INDEX] = left; 3973 location[CHILD_TOP_INDEX] = top; 3974 3975 if (mLayerType != LAYER_TYPE_NONE) { 3976 mLocalDirtyRect.union(dirty); 3977 } 3978 3979 return mParent; 3980 } 3981 } else { 3982 mPrivateFlags &= ~DRAWN & ~DRAWING_CACHE_VALID; 3983 3984 location[CHILD_LEFT_INDEX] = mLeft; 3985 location[CHILD_TOP_INDEX] = mTop; 3986 if ((mGroupFlags & FLAG_CLIP_CHILDREN) == FLAG_CLIP_CHILDREN) { 3987 dirty.set(0, 0, mRight - mLeft, mBottom - mTop); 3988 } else { 3989 // in case the dirty rect extends outside the bounds of this container 3990 dirty.union(0, 0, mRight - mLeft, mBottom - mTop); 3991 } 3992 3993 if (mLayerType != LAYER_TYPE_NONE) { 3994 mLocalDirtyRect.union(dirty); 3995 } 3996 3997 return mParent; 3998 } 3999 } 4000 4001 return null; 4002 } 4003 4004 /** 4005 * Offset a rectangle that is in a descendant's coordinate 4006 * space into our coordinate space. 4007 * @param descendant A descendant of this view 4008 * @param rect A rectangle defined in descendant's coordinate space. 4009 */ 4010 public final void offsetDescendantRectToMyCoords(View descendant, Rect rect) { 4011 offsetRectBetweenParentAndChild(descendant, rect, true, false); 4012 } 4013 4014 /** 4015 * Offset a rectangle that is in our coordinate space into an ancestor's 4016 * coordinate space. 4017 * @param descendant A descendant of this view 4018 * @param rect A rectangle defined in descendant's coordinate space. 4019 */ 4020 public final void offsetRectIntoDescendantCoords(View descendant, Rect rect) { 4021 offsetRectBetweenParentAndChild(descendant, rect, false, false); 4022 } 4023 4024 /** 4025 * Helper method that offsets a rect either from parent to descendant or 4026 * descendant to parent. 4027 */ 4028 void offsetRectBetweenParentAndChild(View descendant, Rect rect, 4029 boolean offsetFromChildToParent, boolean clipToBounds) { 4030 4031 // already in the same coord system :) 4032 if (descendant == this) { 4033 return; 4034 } 4035 4036 ViewParent theParent = descendant.mParent; 4037 4038 // search and offset up to the parent 4039 while ((theParent != null) 4040 && (theParent instanceof View) 4041 && (theParent != this)) { 4042 4043 if (offsetFromChildToParent) { 4044 rect.offset(descendant.mLeft - descendant.mScrollX, 4045 descendant.mTop - descendant.mScrollY); 4046 if (clipToBounds) { 4047 View p = (View) theParent; 4048 rect.intersect(0, 0, p.mRight - p.mLeft, p.mBottom - p.mTop); 4049 } 4050 } else { 4051 if (clipToBounds) { 4052 View p = (View) theParent; 4053 rect.intersect(0, 0, p.mRight - p.mLeft, p.mBottom - p.mTop); 4054 } 4055 rect.offset(descendant.mScrollX - descendant.mLeft, 4056 descendant.mScrollY - descendant.mTop); 4057 } 4058 4059 descendant = (View) theParent; 4060 theParent = descendant.mParent; 4061 } 4062 4063 // now that we are up to this view, need to offset one more time 4064 // to get into our coordinate space 4065 if (theParent == this) { 4066 if (offsetFromChildToParent) { 4067 rect.offset(descendant.mLeft - descendant.mScrollX, 4068 descendant.mTop - descendant.mScrollY); 4069 } else { 4070 rect.offset(descendant.mScrollX - descendant.mLeft, 4071 descendant.mScrollY - descendant.mTop); 4072 } 4073 } else { 4074 throw new IllegalArgumentException("parameter must be a descendant of this view"); 4075 } 4076 } 4077 4078 /** 4079 * Offset the vertical location of all children of this view by the specified number of pixels. 4080 * 4081 * @param offset the number of pixels to offset 4082 * 4083 * @hide 4084 */ 4085 public void offsetChildrenTopAndBottom(int offset) { 4086 final int count = mChildrenCount; 4087 final View[] children = mChildren; 4088 4089 for (int i = 0; i < count; i++) { 4090 final View v = children[i]; 4091 v.mTop += offset; 4092 v.mBottom += offset; 4093 } 4094 } 4095 4096 /** 4097 * {@inheritDoc} 4098 */ 4099 public boolean getChildVisibleRect(View child, Rect r, android.graphics.Point offset) { 4100 int dx = child.mLeft - mScrollX; 4101 int dy = child.mTop - mScrollY; 4102 if (offset != null) { 4103 offset.x += dx; 4104 offset.y += dy; 4105 } 4106 r.offset(dx, dy); 4107 return r.intersect(0, 0, mRight - mLeft, mBottom - mTop) && 4108 (mParent == null || mParent.getChildVisibleRect(this, r, offset)); 4109 } 4110 4111 /** 4112 * {@inheritDoc} 4113 */ 4114 @Override 4115 public final void layout(int l, int t, int r, int b) { 4116 if (mTransition == null || !mTransition.isChangingLayout()) { 4117 super.layout(l, t, r, b); 4118 } else { 4119 // record the fact that we noop'd it; request layout when transition finishes 4120 mLayoutSuppressed = true; 4121 } 4122 } 4123 4124 /** 4125 * {@inheritDoc} 4126 */ 4127 @Override 4128 protected abstract void onLayout(boolean changed, 4129 int l, int t, int r, int b); 4130 4131 /** 4132 * Indicates whether the view group has the ability to animate its children 4133 * after the first layout. 4134 * 4135 * @return true if the children can be animated, false otherwise 4136 */ 4137 protected boolean canAnimate() { 4138 return mLayoutAnimationController != null; 4139 } 4140 4141 /** 4142 * Runs the layout animation. Calling this method triggers a relayout of 4143 * this view group. 4144 */ 4145 public void startLayoutAnimation() { 4146 if (mLayoutAnimationController != null) { 4147 mGroupFlags |= FLAG_RUN_ANIMATION; 4148 requestLayout(); 4149 } 4150 } 4151 4152 /** 4153 * Schedules the layout animation to be played after the next layout pass 4154 * of this view group. This can be used to restart the layout animation 4155 * when the content of the view group changes or when the activity is 4156 * paused and resumed. 4157 */ 4158 public void scheduleLayoutAnimation() { 4159 mGroupFlags |= FLAG_RUN_ANIMATION; 4160 } 4161 4162 /** 4163 * Sets the layout animation controller used to animate the group's 4164 * children after the first layout. 4165 * 4166 * @param controller the animation controller 4167 */ 4168 public void setLayoutAnimation(LayoutAnimationController controller) { 4169 mLayoutAnimationController = controller; 4170 if (mLayoutAnimationController != null) { 4171 mGroupFlags |= FLAG_RUN_ANIMATION; 4172 } 4173 } 4174 4175 /** 4176 * Returns the layout animation controller used to animate the group's 4177 * children. 4178 * 4179 * @return the current animation controller 4180 */ 4181 public LayoutAnimationController getLayoutAnimation() { 4182 return mLayoutAnimationController; 4183 } 4184 4185 /** 4186 * Indicates whether the children's drawing cache is used during a layout 4187 * animation. By default, the drawing cache is enabled but this will prevent 4188 * nested layout animations from working. To nest animations, you must disable 4189 * the cache. 4190 * 4191 * @return true if the animation cache is enabled, false otherwise 4192 * 4193 * @see #setAnimationCacheEnabled(boolean) 4194 * @see View#setDrawingCacheEnabled(boolean) 4195 */ 4196 @ViewDebug.ExportedProperty 4197 public boolean isAnimationCacheEnabled() { 4198 return (mGroupFlags & FLAG_ANIMATION_CACHE) == FLAG_ANIMATION_CACHE; 4199 } 4200 4201 /** 4202 * Enables or disables the children's drawing cache during a layout animation. 4203 * By default, the drawing cache is enabled but this will prevent nested 4204 * layout animations from working. To nest animations, you must disable the 4205 * cache. 4206 * 4207 * @param enabled true to enable the animation cache, false otherwise 4208 * 4209 * @see #isAnimationCacheEnabled() 4210 * @see View#setDrawingCacheEnabled(boolean) 4211 */ 4212 public void setAnimationCacheEnabled(boolean enabled) { 4213 setBooleanFlag(FLAG_ANIMATION_CACHE, enabled); 4214 } 4215 4216 /** 4217 * Indicates whether this ViewGroup will always try to draw its children using their 4218 * drawing cache. By default this property is enabled. 4219 * 4220 * @return true if the animation cache is enabled, false otherwise 4221 * 4222 * @see #setAlwaysDrawnWithCacheEnabled(boolean) 4223 * @see #setChildrenDrawnWithCacheEnabled(boolean) 4224 * @see View#setDrawingCacheEnabled(boolean) 4225 */ 4226 @ViewDebug.ExportedProperty(category = "drawing") 4227 public boolean isAlwaysDrawnWithCacheEnabled() { 4228 return (mGroupFlags & FLAG_ALWAYS_DRAWN_WITH_CACHE) == FLAG_ALWAYS_DRAWN_WITH_CACHE; 4229 } 4230 4231 /** 4232 * Indicates whether this ViewGroup will always try to draw its children using their 4233 * drawing cache. This property can be set to true when the cache rendering is 4234 * slightly different from the children's normal rendering. Renderings can be different, 4235 * for instance, when the cache's quality is set to low. 4236 * 4237 * When this property is disabled, the ViewGroup will use the drawing cache of its 4238 * children only when asked to. It's usually the task of subclasses to tell ViewGroup 4239 * when to start using the drawing cache and when to stop using it. 4240 * 4241 * @param always true to always draw with the drawing cache, false otherwise 4242 * 4243 * @see #isAlwaysDrawnWithCacheEnabled() 4244 * @see #setChildrenDrawnWithCacheEnabled(boolean) 4245 * @see View#setDrawingCacheEnabled(boolean) 4246 * @see View#setDrawingCacheQuality(int) 4247 */ 4248 public void setAlwaysDrawnWithCacheEnabled(boolean always) { 4249 setBooleanFlag(FLAG_ALWAYS_DRAWN_WITH_CACHE, always); 4250 } 4251 4252 /** 4253 * Indicates whether the ViewGroup is currently drawing its children using 4254 * their drawing cache. 4255 * 4256 * @return true if children should be drawn with their cache, false otherwise 4257 * 4258 * @see #setAlwaysDrawnWithCacheEnabled(boolean) 4259 * @see #setChildrenDrawnWithCacheEnabled(boolean) 4260 */ 4261 @ViewDebug.ExportedProperty(category = "drawing") 4262 protected boolean isChildrenDrawnWithCacheEnabled() { 4263 return (mGroupFlags & FLAG_CHILDREN_DRAWN_WITH_CACHE) == FLAG_CHILDREN_DRAWN_WITH_CACHE; 4264 } 4265 4266 /** 4267 * Tells the ViewGroup to draw its children using their drawing cache. This property 4268 * is ignored when {@link #isAlwaysDrawnWithCacheEnabled()} is true. A child's drawing cache 4269 * will be used only if it has been enabled. 4270 * 4271 * Subclasses should call this method to start and stop using the drawing cache when 4272 * they perform performance sensitive operations, like scrolling or animating. 4273 * 4274 * @param enabled true if children should be drawn with their cache, false otherwise 4275 * 4276 * @see #setAlwaysDrawnWithCacheEnabled(boolean) 4277 * @see #isChildrenDrawnWithCacheEnabled() 4278 */ 4279 protected void setChildrenDrawnWithCacheEnabled(boolean enabled) { 4280 setBooleanFlag(FLAG_CHILDREN_DRAWN_WITH_CACHE, enabled); 4281 } 4282 4283 /** 4284 * Indicates whether the ViewGroup is drawing its children in the order defined by 4285 * {@link #getChildDrawingOrder(int, int)}. 4286 * 4287 * @return true if children drawing order is defined by {@link #getChildDrawingOrder(int, int)}, 4288 * false otherwise 4289 * 4290 * @see #setChildrenDrawingOrderEnabled(boolean) 4291 * @see #getChildDrawingOrder(int, int) 4292 */ 4293 @ViewDebug.ExportedProperty(category = "drawing") 4294 protected boolean isChildrenDrawingOrderEnabled() { 4295 return (mGroupFlags & FLAG_USE_CHILD_DRAWING_ORDER) == FLAG_USE_CHILD_DRAWING_ORDER; 4296 } 4297 4298 /** 4299 * Tells the ViewGroup whether to draw its children in the order defined by the method 4300 * {@link #getChildDrawingOrder(int, int)}. 4301 * 4302 * @param enabled true if the order of the children when drawing is determined by 4303 * {@link #getChildDrawingOrder(int, int)}, false otherwise 4304 * 4305 * @see #isChildrenDrawingOrderEnabled() 4306 * @see #getChildDrawingOrder(int, int) 4307 */ 4308 protected void setChildrenDrawingOrderEnabled(boolean enabled) { 4309 setBooleanFlag(FLAG_USE_CHILD_DRAWING_ORDER, enabled); 4310 } 4311 4312 private void setBooleanFlag(int flag, boolean value) { 4313 if (value) { 4314 mGroupFlags |= flag; 4315 } else { 4316 mGroupFlags &= ~flag; 4317 } 4318 } 4319 4320 /** 4321 * Returns an integer indicating what types of drawing caches are kept in memory. 4322 * 4323 * @see #setPersistentDrawingCache(int) 4324 * @see #setAnimationCacheEnabled(boolean) 4325 * 4326 * @return one or a combination of {@link #PERSISTENT_NO_CACHE}, 4327 * {@link #PERSISTENT_ANIMATION_CACHE}, {@link #PERSISTENT_SCROLLING_CACHE} 4328 * and {@link #PERSISTENT_ALL_CACHES} 4329 */ 4330 @ViewDebug.ExportedProperty(category = "drawing", mapping = { 4331 @ViewDebug.IntToString(from = PERSISTENT_NO_CACHE, to = "NONE"), 4332 @ViewDebug.IntToString(from = PERSISTENT_ANIMATION_CACHE, to = "ANIMATION"), 4333 @ViewDebug.IntToString(from = PERSISTENT_SCROLLING_CACHE, to = "SCROLLING"), 4334 @ViewDebug.IntToString(from = PERSISTENT_ALL_CACHES, to = "ALL") 4335 }) 4336 public int getPersistentDrawingCache() { 4337 return mPersistentDrawingCache; 4338 } 4339 4340 /** 4341 * Indicates what types of drawing caches should be kept in memory after 4342 * they have been created. 4343 * 4344 * @see #getPersistentDrawingCache() 4345 * @see #setAnimationCacheEnabled(boolean) 4346 * 4347 * @param drawingCacheToKeep one or a combination of {@link #PERSISTENT_NO_CACHE}, 4348 * {@link #PERSISTENT_ANIMATION_CACHE}, {@link #PERSISTENT_SCROLLING_CACHE} 4349 * and {@link #PERSISTENT_ALL_CACHES} 4350 */ 4351 public void setPersistentDrawingCache(int drawingCacheToKeep) { 4352 mPersistentDrawingCache = drawingCacheToKeep & PERSISTENT_ALL_CACHES; 4353 } 4354 4355 /** 4356 * Returns a new set of layout parameters based on the supplied attributes set. 4357 * 4358 * @param attrs the attributes to build the layout parameters from 4359 * 4360 * @return an instance of {@link android.view.ViewGroup.LayoutParams} or one 4361 * of its descendants 4362 */ 4363 public LayoutParams generateLayoutParams(AttributeSet attrs) { 4364 return new LayoutParams(getContext(), attrs); 4365 } 4366 4367 /** 4368 * Returns a safe set of layout parameters based on the supplied layout params. 4369 * When a ViewGroup is passed a View whose layout params do not pass the test of 4370 * {@link #checkLayoutParams(android.view.ViewGroup.LayoutParams)}, this method 4371 * is invoked. This method should return a new set of layout params suitable for 4372 * this ViewGroup, possibly by copying the appropriate attributes from the 4373 * specified set of layout params. 4374 * 4375 * @param p The layout parameters to convert into a suitable set of layout parameters 4376 * for this ViewGroup. 4377 * 4378 * @return an instance of {@link android.view.ViewGroup.LayoutParams} or one 4379 * of its descendants 4380 */ 4381 protected LayoutParams generateLayoutParams(ViewGroup.LayoutParams p) { 4382 return p; 4383 } 4384 4385 /** 4386 * Returns a set of default layout parameters. These parameters are requested 4387 * when the View passed to {@link #addView(View)} has no layout parameters 4388 * already set. If null is returned, an exception is thrown from addView. 4389 * 4390 * @return a set of default layout parameters or null 4391 */ 4392 protected LayoutParams generateDefaultLayoutParams() { 4393 return new LayoutParams(LayoutParams.WRAP_CONTENT, LayoutParams.WRAP_CONTENT); 4394 } 4395 4396 /** 4397 * @hide 4398 */ 4399 @Override 4400 protected boolean dispatchConsistencyCheck(int consistency) { 4401 boolean result = super.dispatchConsistencyCheck(consistency); 4402 4403 final int count = mChildrenCount; 4404 final View[] children = mChildren; 4405 for (int i = 0; i < count; i++) { 4406 if (!children[i].dispatchConsistencyCheck(consistency)) result = false; 4407 } 4408 4409 return result; 4410 } 4411 4412 /** 4413 * @hide 4414 */ 4415 @Override 4416 protected boolean onConsistencyCheck(int consistency) { 4417 boolean result = super.onConsistencyCheck(consistency); 4418 4419 final boolean checkLayout = (consistency & ViewDebug.CONSISTENCY_LAYOUT) != 0; 4420 final boolean checkDrawing = (consistency & ViewDebug.CONSISTENCY_DRAWING) != 0; 4421 4422 if (checkLayout) { 4423 final int count = mChildrenCount; 4424 final View[] children = mChildren; 4425 for (int i = 0; i < count; i++) { 4426 if (children[i].getParent() != this) { 4427 result = false; 4428 android.util.Log.d(ViewDebug.CONSISTENCY_LOG_TAG, 4429 "View " + children[i] + " has no parent/a parent that is not " + this); 4430 } 4431 } 4432 } 4433 4434 if (checkDrawing) { 4435 // If this group is dirty, check that the parent is dirty as well 4436 if ((mPrivateFlags & DIRTY_MASK) != 0) { 4437 final ViewParent parent = getParent(); 4438 if (parent != null && !(parent instanceof ViewRootImpl)) { 4439 if ((((View) parent).mPrivateFlags & DIRTY_MASK) == 0) { 4440 result = false; 4441 android.util.Log.d(ViewDebug.CONSISTENCY_LOG_TAG, 4442 "ViewGroup " + this + " is dirty but its parent is not: " + this); 4443 } 4444 } 4445 } 4446 } 4447 4448 return result; 4449 } 4450 4451 /** 4452 * {@inheritDoc} 4453 */ 4454 @Override 4455 protected void debug(int depth) { 4456 super.debug(depth); 4457 String output; 4458 4459 if (mFocused != null) { 4460 output = debugIndent(depth); 4461 output += "mFocused"; 4462 Log.d(VIEW_LOG_TAG, output); 4463 } 4464 if (mChildrenCount != 0) { 4465 output = debugIndent(depth); 4466 output += "{"; 4467 Log.d(VIEW_LOG_TAG, output); 4468 } 4469 int count = mChildrenCount; 4470 for (int i = 0; i < count; i++) { 4471 View child = mChildren[i]; 4472 child.debug(depth + 1); 4473 } 4474 4475 if (mChildrenCount != 0) { 4476 output = debugIndent(depth); 4477 output += "}"; 4478 Log.d(VIEW_LOG_TAG, output); 4479 } 4480 } 4481 4482 /** 4483 * Returns the position in the group of the specified child view. 4484 * 4485 * @param child the view for which to get the position 4486 * @return a positive integer representing the position of the view in the 4487 * group, or -1 if the view does not exist in the group 4488 */ 4489 public int indexOfChild(View child) { 4490 final int count = mChildrenCount; 4491 final View[] children = mChildren; 4492 for (int i = 0; i < count; i++) { 4493 if (children[i] == child) { 4494 return i; 4495 } 4496 } 4497 return -1; 4498 } 4499 4500 /** 4501 * Returns the number of children in the group. 4502 * 4503 * @return a positive integer representing the number of children in 4504 * the group 4505 */ 4506 public int getChildCount() { 4507 return mChildrenCount; 4508 } 4509 4510 /** 4511 * Returns the view at the specified position in the group. 4512 * 4513 * @param index the position at which to get the view from 4514 * @return the view at the specified position or null if the position 4515 * does not exist within the group 4516 */ 4517 public View getChildAt(int index) { 4518 if (index < 0 || index >= mChildrenCount) { 4519 return null; 4520 } 4521 return mChildren[index]; 4522 } 4523 4524 /** 4525 * Ask all of the children of this view to measure themselves, taking into 4526 * account both the MeasureSpec requirements for this view and its padding. 4527 * We skip children that are in the GONE state The heavy lifting is done in 4528 * getChildMeasureSpec. 4529 * 4530 * @param widthMeasureSpec The width requirements for this view 4531 * @param heightMeasureSpec The height requirements for this view 4532 */ 4533 protected void measureChildren(int widthMeasureSpec, int heightMeasureSpec) { 4534 final int size = mChildrenCount; 4535 final View[] children = mChildren; 4536 for (int i = 0; i < size; ++i) { 4537 final View child = children[i]; 4538 if ((child.mViewFlags & VISIBILITY_MASK) != GONE) { 4539 measureChild(child, widthMeasureSpec, heightMeasureSpec); 4540 } 4541 } 4542 } 4543 4544 /** 4545 * Ask one of the children of this view to measure itself, taking into 4546 * account both the MeasureSpec requirements for this view and its padding. 4547 * The heavy lifting is done in getChildMeasureSpec. 4548 * 4549 * @param child The child to measure 4550 * @param parentWidthMeasureSpec The width requirements for this view 4551 * @param parentHeightMeasureSpec The height requirements for this view 4552 */ 4553 protected void measureChild(View child, int parentWidthMeasureSpec, 4554 int parentHeightMeasureSpec) { 4555 final LayoutParams lp = child.getLayoutParams(); 4556 4557 final int childWidthMeasureSpec = getChildMeasureSpec(parentWidthMeasureSpec, 4558 mPaddingLeft + mPaddingRight, lp.width); 4559 final int childHeightMeasureSpec = getChildMeasureSpec(parentHeightMeasureSpec, 4560 mPaddingTop + mPaddingBottom, lp.height); 4561 4562 child.measure(childWidthMeasureSpec, childHeightMeasureSpec); 4563 } 4564 4565 /** 4566 * Ask one of the children of this view to measure itself, taking into 4567 * account both the MeasureSpec requirements for this view and its padding 4568 * and margins. The child must have MarginLayoutParams The heavy lifting is 4569 * done in getChildMeasureSpec. 4570 * 4571 * @param child The child to measure 4572 * @param parentWidthMeasureSpec The width requirements for this view 4573 * @param widthUsed Extra space that has been used up by the parent 4574 * horizontally (possibly by other children of the parent) 4575 * @param parentHeightMeasureSpec The height requirements for this view 4576 * @param heightUsed Extra space that has been used up by the parent 4577 * vertically (possibly by other children of the parent) 4578 */ 4579 protected void measureChildWithMargins(View child, 4580 int parentWidthMeasureSpec, int widthUsed, 4581 int parentHeightMeasureSpec, int heightUsed) { 4582 final MarginLayoutParams lp = (MarginLayoutParams) child.getLayoutParams(); 4583 4584 final int childWidthMeasureSpec = getChildMeasureSpec(parentWidthMeasureSpec, 4585 mPaddingLeft + mPaddingRight + lp.leftMargin + lp.rightMargin 4586 + widthUsed, lp.width); 4587 final int childHeightMeasureSpec = getChildMeasureSpec(parentHeightMeasureSpec, 4588 mPaddingTop + mPaddingBottom + lp.topMargin + lp.bottomMargin 4589 + heightUsed, lp.height); 4590 4591 child.measure(childWidthMeasureSpec, childHeightMeasureSpec); 4592 } 4593 4594 /** 4595 * Does the hard part of measureChildren: figuring out the MeasureSpec to 4596 * pass to a particular child. This method figures out the right MeasureSpec 4597 * for one dimension (height or width) of one child view. 4598 * 4599 * The goal is to combine information from our MeasureSpec with the 4600 * LayoutParams of the child to get the best possible results. For example, 4601 * if the this view knows its size (because its MeasureSpec has a mode of 4602 * EXACTLY), and the child has indicated in its LayoutParams that it wants 4603 * to be the same size as the parent, the parent should ask the child to 4604 * layout given an exact size. 4605 * 4606 * @param spec The requirements for this view 4607 * @param padding The padding of this view for the current dimension and 4608 * margins, if applicable 4609 * @param childDimension How big the child wants to be in the current 4610 * dimension 4611 * @return a MeasureSpec integer for the child 4612 */ 4613 public static int getChildMeasureSpec(int spec, int padding, int childDimension) { 4614 int specMode = MeasureSpec.getMode(spec); 4615 int specSize = MeasureSpec.getSize(spec); 4616 4617 int size = Math.max(0, specSize - padding); 4618 4619 int resultSize = 0; 4620 int resultMode = 0; 4621 4622 switch (specMode) { 4623 // Parent has imposed an exact size on us 4624 case MeasureSpec.EXACTLY: 4625 if (childDimension >= 0) { 4626 resultSize = childDimension; 4627 resultMode = MeasureSpec.EXACTLY; 4628 } else if (childDimension == LayoutParams.MATCH_PARENT) { 4629 // Child wants to be our size. So be it. 4630 resultSize = size; 4631 resultMode = MeasureSpec.EXACTLY; 4632 } else if (childDimension == LayoutParams.WRAP_CONTENT) { 4633 // Child wants to determine its own size. It can't be 4634 // bigger than us. 4635 resultSize = size; 4636 resultMode = MeasureSpec.AT_MOST; 4637 } 4638 break; 4639 4640 // Parent has imposed a maximum size on us 4641 case MeasureSpec.AT_MOST: 4642 if (childDimension >= 0) { 4643 // Child wants a specific size... so be it 4644 resultSize = childDimension; 4645 resultMode = MeasureSpec.EXACTLY; 4646 } else if (childDimension == LayoutParams.MATCH_PARENT) { 4647 // Child wants to be our size, but our size is not fixed. 4648 // Constrain child to not be bigger than us. 4649 resultSize = size; 4650 resultMode = MeasureSpec.AT_MOST; 4651 } else if (childDimension == LayoutParams.WRAP_CONTENT) { 4652 // Child wants to determine its own size. It can't be 4653 // bigger than us. 4654 resultSize = size; 4655 resultMode = MeasureSpec.AT_MOST; 4656 } 4657 break; 4658 4659 // Parent asked to see how big we want to be 4660 case MeasureSpec.UNSPECIFIED: 4661 if (childDimension >= 0) { 4662 // Child wants a specific size... let him have it 4663 resultSize = childDimension; 4664 resultMode = MeasureSpec.EXACTLY; 4665 } else if (childDimension == LayoutParams.MATCH_PARENT) { 4666 // Child wants to be our size... find out how big it should 4667 // be 4668 resultSize = 0; 4669 resultMode = MeasureSpec.UNSPECIFIED; 4670 } else if (childDimension == LayoutParams.WRAP_CONTENT) { 4671 // Child wants to determine its own size.... find out how 4672 // big it should be 4673 resultSize = 0; 4674 resultMode = MeasureSpec.UNSPECIFIED; 4675 } 4676 break; 4677 } 4678 return MeasureSpec.makeMeasureSpec(resultSize, resultMode); 4679 } 4680 4681 4682 /** 4683 * Removes any pending animations for views that have been removed. Call 4684 * this if you don't want animations for exiting views to stack up. 4685 */ 4686 public void clearDisappearingChildren() { 4687 if (mDisappearingChildren != null) { 4688 mDisappearingChildren.clear(); 4689 } 4690 } 4691 4692 /** 4693 * Add a view which is removed from mChildren but still needs animation 4694 * 4695 * @param v View to add 4696 */ 4697 private void addDisappearingView(View v) { 4698 ArrayList<View> disappearingChildren = mDisappearingChildren; 4699 4700 if (disappearingChildren == null) { 4701 disappearingChildren = mDisappearingChildren = new ArrayList<View>(); 4702 } 4703 4704 disappearingChildren.add(v); 4705 } 4706 4707 /** 4708 * Cleanup a view when its animation is done. This may mean removing it from 4709 * the list of disappearing views. 4710 * 4711 * @param view The view whose animation has finished 4712 * @param animation The animation, cannot be null 4713 */ 4714 private void finishAnimatingView(final View view, Animation animation) { 4715 final ArrayList<View> disappearingChildren = mDisappearingChildren; 4716 if (disappearingChildren != null) { 4717 if (disappearingChildren.contains(view)) { 4718 disappearingChildren.remove(view); 4719 4720 if (view.mAttachInfo != null) { 4721 view.dispatchDetachedFromWindow(); 4722 } 4723 4724 view.clearAnimation(); 4725 mGroupFlags |= FLAG_INVALIDATE_REQUIRED; 4726 } 4727 } 4728 4729 if (animation != null && !animation.getFillAfter()) { 4730 view.clearAnimation(); 4731 } 4732 4733 if ((view.mPrivateFlags & ANIMATION_STARTED) == ANIMATION_STARTED) { 4734 view.onAnimationEnd(); 4735 // Should be performed by onAnimationEnd() but this avoid an infinite loop, 4736 // so we'd rather be safe than sorry 4737 view.mPrivateFlags &= ~ANIMATION_STARTED; 4738 // Draw one more frame after the animation is done 4739 mGroupFlags |= FLAG_INVALIDATE_REQUIRED; 4740 } 4741 } 4742 4743 /** 4744 * This method tells the ViewGroup that the given View object, which should have this 4745 * ViewGroup as its parent, 4746 * should be kept around (re-displayed when the ViewGroup draws its children) even if it 4747 * is removed from its parent. This allows animations, such as those used by 4748 * {@link android.app.Fragment} and {@link android.animation.LayoutTransition} to animate 4749 * the removal of views. A call to this method should always be accompanied by a later call 4750 * to {@link #endViewTransition(View)}, such as after an animation on the View has finished, 4751 * so that the View finally gets removed. 4752 * 4753 * @param view The View object to be kept visible even if it gets removed from its parent. 4754 */ 4755 public void startViewTransition(View view) { 4756 if (view.mParent == this) { 4757 if (mTransitioningViews == null) { 4758 mTransitioningViews = new ArrayList<View>(); 4759 } 4760 mTransitioningViews.add(view); 4761 } 4762 } 4763 4764 /** 4765 * This method should always be called following an earlier call to 4766 * {@link #startViewTransition(View)}. The given View is finally removed from its parent 4767 * and will no longer be displayed. Note that this method does not perform the functionality 4768 * of removing a view from its parent; it just discontinues the display of a View that 4769 * has previously been removed. 4770 * 4771 * @return view The View object that has been removed but is being kept around in the visible 4772 * hierarchy by an earlier call to {@link #startViewTransition(View)}. 4773 */ 4774 public void endViewTransition(View view) { 4775 if (mTransitioningViews != null) { 4776 mTransitioningViews.remove(view); 4777 final ArrayList<View> disappearingChildren = mDisappearingChildren; 4778 if (disappearingChildren != null && disappearingChildren.contains(view)) { 4779 disappearingChildren.remove(view); 4780 if (mVisibilityChangingChildren != null && 4781 mVisibilityChangingChildren.contains(view)) { 4782 mVisibilityChangingChildren.remove(view); 4783 } else { 4784 if (view.mAttachInfo != null) { 4785 view.dispatchDetachedFromWindow(); 4786 } 4787 if (view.mParent != null) { 4788 view.mParent = null; 4789 } 4790 } 4791 mGroupFlags |= FLAG_INVALIDATE_REQUIRED; 4792 } 4793 } 4794 } 4795 4796 private LayoutTransition.TransitionListener mLayoutTransitionListener = 4797 new LayoutTransition.TransitionListener() { 4798 @Override 4799 public void startTransition(LayoutTransition transition, ViewGroup container, 4800 View view, int transitionType) { 4801 // We only care about disappearing items, since we need special logic to keep 4802 // those items visible after they've been 'removed' 4803 if (transitionType == LayoutTransition.DISAPPEARING) { 4804 startViewTransition(view); 4805 } 4806 } 4807 4808 @Override 4809 public void endTransition(LayoutTransition transition, ViewGroup container, 4810 View view, int transitionType) { 4811 if (mLayoutSuppressed && !transition.isChangingLayout()) { 4812 requestLayout(); 4813 mLayoutSuppressed = false; 4814 } 4815 if (transitionType == LayoutTransition.DISAPPEARING && mTransitioningViews != null) { 4816 endViewTransition(view); 4817 } 4818 } 4819 }; 4820 4821 /** 4822 * {@inheritDoc} 4823 */ 4824 @Override 4825 public boolean gatherTransparentRegion(Region region) { 4826 // If no transparent regions requested, we are always opaque. 4827 final boolean meOpaque = (mPrivateFlags & View.REQUEST_TRANSPARENT_REGIONS) == 0; 4828 if (meOpaque && region == null) { 4829 // The caller doesn't care about the region, so stop now. 4830 return true; 4831 } 4832 super.gatherTransparentRegion(region); 4833 final View[] children = mChildren; 4834 final int count = mChildrenCount; 4835 boolean noneOfTheChildrenAreTransparent = true; 4836 for (int i = 0; i < count; i++) { 4837 final View child = children[i]; 4838 if ((child.mViewFlags & VISIBILITY_MASK) == VISIBLE || child.getAnimation() != null) { 4839 if (!child.gatherTransparentRegion(region)) { 4840 noneOfTheChildrenAreTransparent = false; 4841 } 4842 } 4843 } 4844 return meOpaque || noneOfTheChildrenAreTransparent; 4845 } 4846 4847 /** 4848 * {@inheritDoc} 4849 */ 4850 public void requestTransparentRegion(View child) { 4851 if (child != null) { 4852 child.mPrivateFlags |= View.REQUEST_TRANSPARENT_REGIONS; 4853 if (mParent != null) { 4854 mParent.requestTransparentRegion(this); 4855 } 4856 } 4857 } 4858 4859 4860 @Override 4861 protected boolean fitSystemWindows(Rect insets) { 4862 boolean done = super.fitSystemWindows(insets); 4863 if (!done) { 4864 final int count = mChildrenCount; 4865 final View[] children = mChildren; 4866 for (int i = 0; i < count; i++) { 4867 done = children[i].fitSystemWindows(insets); 4868 if (done) { 4869 break; 4870 } 4871 } 4872 } 4873 return done; 4874 } 4875 4876 /** 4877 * Returns the animation listener to which layout animation events are 4878 * sent. 4879 * 4880 * @return an {@link android.view.animation.Animation.AnimationListener} 4881 */ 4882 public Animation.AnimationListener getLayoutAnimationListener() { 4883 return mAnimationListener; 4884 } 4885 4886 @Override 4887 protected void drawableStateChanged() { 4888 super.drawableStateChanged(); 4889 4890 if ((mGroupFlags & FLAG_NOTIFY_CHILDREN_ON_DRAWABLE_STATE_CHANGE) != 0) { 4891 if ((mGroupFlags & FLAG_ADD_STATES_FROM_CHILDREN) != 0) { 4892 throw new IllegalStateException("addStateFromChildren cannot be enabled if a" 4893 + " child has duplicateParentState set to true"); 4894 } 4895 4896 final View[] children = mChildren; 4897 final int count = mChildrenCount; 4898 4899 for (int i = 0; i < count; i++) { 4900 final View child = children[i]; 4901 if ((child.mViewFlags & DUPLICATE_PARENT_STATE) != 0) { 4902 child.refreshDrawableState(); 4903 } 4904 } 4905 } 4906 } 4907 4908 @Override 4909 public void jumpDrawablesToCurrentState() { 4910 super.jumpDrawablesToCurrentState(); 4911 final View[] children = mChildren; 4912 final int count = mChildrenCount; 4913 for (int i = 0; i < count; i++) { 4914 children[i].jumpDrawablesToCurrentState(); 4915 } 4916 } 4917 4918 @Override 4919 protected int[] onCreateDrawableState(int extraSpace) { 4920 if ((mGroupFlags & FLAG_ADD_STATES_FROM_CHILDREN) == 0) { 4921 return super.onCreateDrawableState(extraSpace); 4922 } 4923 4924 int need = 0; 4925 int n = getChildCount(); 4926 for (int i = 0; i < n; i++) { 4927 int[] childState = getChildAt(i).getDrawableState(); 4928 4929 if (childState != null) { 4930 need += childState.length; 4931 } 4932 } 4933 4934 int[] state = super.onCreateDrawableState(extraSpace + need); 4935 4936 for (int i = 0; i < n; i++) { 4937 int[] childState = getChildAt(i).getDrawableState(); 4938 4939 if (childState != null) { 4940 state = mergeDrawableStates(state, childState); 4941 } 4942 } 4943 4944 return state; 4945 } 4946 4947 /** 4948 * Sets whether this ViewGroup's drawable states also include 4949 * its children's drawable states. This is used, for example, to 4950 * make a group appear to be focused when its child EditText or button 4951 * is focused. 4952 */ 4953 public void setAddStatesFromChildren(boolean addsStates) { 4954 if (addsStates) { 4955 mGroupFlags |= FLAG_ADD_STATES_FROM_CHILDREN; 4956 } else { 4957 mGroupFlags &= ~FLAG_ADD_STATES_FROM_CHILDREN; 4958 } 4959 4960 refreshDrawableState(); 4961 } 4962 4963 /** 4964 * Returns whether this ViewGroup's drawable states also include 4965 * its children's drawable states. This is used, for example, to 4966 * make a group appear to be focused when its child EditText or button 4967 * is focused. 4968 */ 4969 public boolean addStatesFromChildren() { 4970 return (mGroupFlags & FLAG_ADD_STATES_FROM_CHILDREN) != 0; 4971 } 4972 4973 /** 4974 * If {link #addStatesFromChildren} is true, refreshes this group's 4975 * drawable state (to include the states from its children). 4976 */ 4977 public void childDrawableStateChanged(View child) { 4978 if ((mGroupFlags & FLAG_ADD_STATES_FROM_CHILDREN) != 0) { 4979 refreshDrawableState(); 4980 } 4981 } 4982 4983 /** 4984 * Specifies the animation listener to which layout animation events must 4985 * be sent. Only 4986 * {@link android.view.animation.Animation.AnimationListener#onAnimationStart(Animation)} 4987 * and 4988 * {@link android.view.animation.Animation.AnimationListener#onAnimationEnd(Animation)} 4989 * are invoked. 4990 * 4991 * @param animationListener the layout animation listener 4992 */ 4993 public void setLayoutAnimationListener(Animation.AnimationListener animationListener) { 4994 mAnimationListener = animationListener; 4995 } 4996 4997 /** 4998 * This method is called by LayoutTransition when there are 'changing' animations that need 4999 * to start after the layout/setup phase. The request is forwarded to the ViewAncestor, who 5000 * starts all pending transitions prior to the drawing phase in the current traversal. 5001 * 5002 * @param transition The LayoutTransition to be started on the next traversal. 5003 * 5004 * @hide 5005 */ 5006 public void requestTransitionStart(LayoutTransition transition) { 5007 ViewRootImpl viewAncestor = getViewRootImpl(); 5008 viewAncestor.requestTransitionStart(transition); 5009 } 5010 5011 @Override 5012 protected void resetResolvedLayoutDirection() { 5013 super.resetResolvedLayoutDirection(); 5014 5015 // Take care of resetting the children resolution too 5016 final int count = getChildCount(); 5017 for (int i = 0; i < count; i++) { 5018 final View child = getChildAt(i); 5019 if (child.getLayoutDirection() == LAYOUT_DIRECTION_INHERIT) { 5020 child.resetResolvedLayoutDirection(); 5021 } 5022 } 5023 } 5024 5025 @Override 5026 protected void resetResolvedTextDirection() { 5027 super.resetResolvedTextDirection(); 5028 5029 // Take care of resetting the children resolution too 5030 final int count = getChildCount(); 5031 for (int i = 0; i < count; i++) { 5032 final View child = getChildAt(i); 5033 if (child.getTextDirection() == TEXT_DIRECTION_INHERIT) { 5034 child.resetResolvedTextDirection(); 5035 } 5036 } 5037 } 5038 5039 /** 5040 * Return true if the pressed state should be delayed for children or descendants of this 5041 * ViewGroup. Generally, this should be done for containers that can scroll, such as a List. 5042 * This prevents the pressed state from appearing when the user is actually trying to scroll 5043 * the content. 5044 * 5045 * The default implementation returns true for compatibility reasons. Subclasses that do 5046 * not scroll should generally override this method and return false. 5047 */ 5048 public boolean shouldDelayChildPressedState() { 5049 return true; 5050 } 5051 5052 /** 5053 * LayoutParams are used by views to tell their parents how they want to be 5054 * laid out. See 5055 * {@link android.R.styleable#ViewGroup_Layout ViewGroup Layout Attributes} 5056 * for a list of all child view attributes that this class supports. 5057 * 5058 * <p> 5059 * The base LayoutParams class just describes how big the view wants to be 5060 * for both width and height. For each dimension, it can specify one of: 5061 * <ul> 5062 * <li>FILL_PARENT (renamed MATCH_PARENT in API Level 8 and higher), which 5063 * means that the view wants to be as big as its parent (minus padding) 5064 * <li> WRAP_CONTENT, which means that the view wants to be just big enough 5065 * to enclose its content (plus padding) 5066 * <li> an exact number 5067 * </ul> 5068 * There are subclasses of LayoutParams for different subclasses of 5069 * ViewGroup. For example, AbsoluteLayout has its own subclass of 5070 * LayoutParams which adds an X and Y value. 5071 * 5072 * @attr ref android.R.styleable#ViewGroup_Layout_layout_height 5073 * @attr ref android.R.styleable#ViewGroup_Layout_layout_width 5074 */ 5075 public static class LayoutParams { 5076 /** 5077 * Special value for the height or width requested by a View. 5078 * FILL_PARENT means that the view wants to be as big as its parent, 5079 * minus the parent's padding, if any. This value is deprecated 5080 * starting in API Level 8 and replaced by {@link #MATCH_PARENT}. 5081 */ 5082 @SuppressWarnings({"UnusedDeclaration"}) 5083 @Deprecated 5084 public static final int FILL_PARENT = -1; 5085 5086 /** 5087 * Special value for the height or width requested by a View. 5088 * MATCH_PARENT means that the view wants to be as big as its parent, 5089 * minus the parent's padding, if any. Introduced in API Level 8. 5090 */ 5091 public static final int MATCH_PARENT = -1; 5092 5093 /** 5094 * Special value for the height or width requested by a View. 5095 * WRAP_CONTENT means that the view wants to be just large enough to fit 5096 * its own internal content, taking its own padding into account. 5097 */ 5098 public static final int WRAP_CONTENT = -2; 5099 5100 /** 5101 * Information about how wide the view wants to be. Can be one of the 5102 * constants FILL_PARENT (replaced by MATCH_PARENT , 5103 * in API Level 8) or WRAP_CONTENT. or an exact size. 5104 */ 5105 @ViewDebug.ExportedProperty(category = "layout", mapping = { 5106 @ViewDebug.IntToString(from = MATCH_PARENT, to = "MATCH_PARENT"), 5107 @ViewDebug.IntToString(from = WRAP_CONTENT, to = "WRAP_CONTENT") 5108 }) 5109 public int width; 5110 5111 /** 5112 * Information about how tall the view wants to be. Can be one of the 5113 * constants FILL_PARENT (replaced by MATCH_PARENT , 5114 * in API Level 8) or WRAP_CONTENT. or an exact size. 5115 */ 5116 @ViewDebug.ExportedProperty(category = "layout", mapping = { 5117 @ViewDebug.IntToString(from = MATCH_PARENT, to = "MATCH_PARENT"), 5118 @ViewDebug.IntToString(from = WRAP_CONTENT, to = "WRAP_CONTENT") 5119 }) 5120 public int height; 5121 5122 /** 5123 * Used to animate layouts. 5124 */ 5125 public LayoutAnimationController.AnimationParameters layoutAnimationParameters; 5126 5127 /** 5128 * Creates a new set of layout parameters. The values are extracted from 5129 * the supplied attributes set and context. The XML attributes mapped 5130 * to this set of layout parameters are: 5131 * 5132 * <ul> 5133 * <li><code>layout_width</code>: the width, either an exact value, 5134 * {@link #WRAP_CONTENT}, or {@link #FILL_PARENT} (replaced by 5135 * {@link #MATCH_PARENT} in API Level 8)</li> 5136 * <li><code>layout_height</code>: the height, either an exact value, 5137 * {@link #WRAP_CONTENT}, or {@link #FILL_PARENT} (replaced by 5138 * {@link #MATCH_PARENT} in API Level 8)</li> 5139 * </ul> 5140 * 5141 * @param c the application environment 5142 * @param attrs the set of attributes from which to extract the layout 5143 * parameters' values 5144 */ 5145 public LayoutParams(Context c, AttributeSet attrs) { 5146 TypedArray a = c.obtainStyledAttributes(attrs, R.styleable.ViewGroup_Layout); 5147 setBaseAttributes(a, 5148 R.styleable.ViewGroup_Layout_layout_width, 5149 R.styleable.ViewGroup_Layout_layout_height); 5150 a.recycle(); 5151 } 5152 5153 /** 5154 * Creates a new set of layout parameters with the specified width 5155 * and height. 5156 * 5157 * @param width the width, either {@link #WRAP_CONTENT}, 5158 * {@link #FILL_PARENT} (replaced by {@link #MATCH_PARENT} in 5159 * API Level 8), or a fixed size in pixels 5160 * @param height the height, either {@link #WRAP_CONTENT}, 5161 * {@link #FILL_PARENT} (replaced by {@link #MATCH_PARENT} in 5162 * API Level 8), or a fixed size in pixels 5163 */ 5164 public LayoutParams(int width, int height) { 5165 this.width = width; 5166 this.height = height; 5167 } 5168 5169 /** 5170 * Copy constructor. Clones the width and height values of the source. 5171 * 5172 * @param source The layout params to copy from. 5173 */ 5174 public LayoutParams(LayoutParams source) { 5175 this.width = source.width; 5176 this.height = source.height; 5177 } 5178 5179 /** 5180 * Used internally by MarginLayoutParams. 5181 * @hide 5182 */ 5183 LayoutParams() { 5184 } 5185 5186 /** 5187 * Extracts the layout parameters from the supplied attributes. 5188 * 5189 * @param a the style attributes to extract the parameters from 5190 * @param widthAttr the identifier of the width attribute 5191 * @param heightAttr the identifier of the height attribute 5192 */ 5193 protected void setBaseAttributes(TypedArray a, int widthAttr, int heightAttr) { 5194 width = a.getLayoutDimension(widthAttr, "layout_width"); 5195 height = a.getLayoutDimension(heightAttr, "layout_height"); 5196 } 5197 5198 /** 5199 * Resolve layout parameters depending on the layout direction. Subclasses that care about 5200 * layoutDirection changes should override this method. The default implementation does 5201 * nothing. 5202 * 5203 * @param layoutDirection the direction of the layout 5204 * 5205 * {@link View#LAYOUT_DIRECTION_LTR} 5206 * {@link View#LAYOUT_DIRECTION_RTL} 5207 * 5208 * @hide 5209 */ 5210 protected void resolveWithDirection(int layoutDirection) { 5211 } 5212 5213 /** 5214 * Returns a String representation of this set of layout parameters. 5215 * 5216 * @param output the String to prepend to the internal representation 5217 * @return a String with the following format: output + 5218 * "ViewGroup.LayoutParams={ width=WIDTH, height=HEIGHT }" 5219 * 5220 * @hide 5221 */ 5222 public String debug(String output) { 5223 return output + "ViewGroup.LayoutParams={ width=" 5224 + sizeToString(width) + ", height=" + sizeToString(height) + " }"; 5225 } 5226 5227 /** 5228 * Converts the specified size to a readable String. 5229 * 5230 * @param size the size to convert 5231 * @return a String instance representing the supplied size 5232 * 5233 * @hide 5234 */ 5235 protected static String sizeToString(int size) { 5236 if (size == WRAP_CONTENT) { 5237 return "wrap-content"; 5238 } 5239 if (size == MATCH_PARENT) { 5240 return "match-parent"; 5241 } 5242 return String.valueOf(size); 5243 } 5244 } 5245 5246 /** 5247 * Per-child layout information for layouts that support margins. 5248 * See 5249 * {@link android.R.styleable#ViewGroup_MarginLayout ViewGroup Margin Layout Attributes} 5250 * for a list of all child view attributes that this class supports. 5251 */ 5252 public static class MarginLayoutParams extends ViewGroup.LayoutParams { 5253 /** 5254 * The left margin in pixels of the child. Whenever this value is changed, a call to 5255 * {@link android.view.View#requestLayout()} needs to be done. 5256 */ 5257 @ViewDebug.ExportedProperty(category = "layout") 5258 public int leftMargin; 5259 5260 /** 5261 * The top margin in pixels of the child. Whenever this value is changed, a call to 5262 * {@link android.view.View#requestLayout()} needs to be done. 5263 */ 5264 @ViewDebug.ExportedProperty(category = "layout") 5265 public int topMargin; 5266 5267 /** 5268 * The right margin in pixels of the child. Whenever this value is changed, a call to 5269 * {@link android.view.View#requestLayout()} needs to be done. 5270 */ 5271 @ViewDebug.ExportedProperty(category = "layout") 5272 public int rightMargin; 5273 5274 /** 5275 * The bottom margin in pixels of the child. Whenever this value is changed, a call to 5276 * {@link android.view.View#requestLayout()} needs to be done. 5277 */ 5278 @ViewDebug.ExportedProperty(category = "layout") 5279 public int bottomMargin; 5280 5281 /** 5282 * The start margin in pixels of the child. 5283 * 5284 * @hide 5285 * 5286 */ 5287 @ViewDebug.ExportedProperty(category = "layout") 5288 protected int startMargin = DEFAULT_RELATIVE; 5289 5290 /** 5291 * The end margin in pixels of the child. 5292 * 5293 * @hide 5294 */ 5295 @ViewDebug.ExportedProperty(category = "layout") 5296 protected int endMargin = DEFAULT_RELATIVE; 5297 5298 /** 5299 * The default start and end margin. 5300 */ 5301 static private final int DEFAULT_RELATIVE = Integer.MIN_VALUE; 5302 5303 /** 5304 * Creates a new set of layout parameters. The values are extracted from 5305 * the supplied attributes set and context. 5306 * 5307 * @param c the application environment 5308 * @param attrs the set of attributes from which to extract the layout 5309 * parameters' values 5310 */ 5311 public MarginLayoutParams(Context c, AttributeSet attrs) { 5312 super(); 5313 5314 TypedArray a = c.obtainStyledAttributes(attrs, R.styleable.ViewGroup_MarginLayout); 5315 setBaseAttributes(a, 5316 R.styleable.ViewGroup_MarginLayout_layout_width, 5317 R.styleable.ViewGroup_MarginLayout_layout_height); 5318 5319 int margin = a.getDimensionPixelSize( 5320 com.android.internal.R.styleable.ViewGroup_MarginLayout_layout_margin, -1); 5321 if (margin >= 0) { 5322 leftMargin = margin; 5323 topMargin = margin; 5324 rightMargin= margin; 5325 bottomMargin = margin; 5326 } else { 5327 leftMargin = a.getDimensionPixelSize( 5328 R.styleable.ViewGroup_MarginLayout_layout_marginLeft, 0); 5329 topMargin = a.getDimensionPixelSize( 5330 R.styleable.ViewGroup_MarginLayout_layout_marginTop, 0); 5331 rightMargin = a.getDimensionPixelSize( 5332 R.styleable.ViewGroup_MarginLayout_layout_marginRight, 0); 5333 bottomMargin = a.getDimensionPixelSize( 5334 R.styleable.ViewGroup_MarginLayout_layout_marginBottom, 0); 5335 startMargin = a.getDimensionPixelSize( 5336 R.styleable.ViewGroup_MarginLayout_layout_marginStart, DEFAULT_RELATIVE); 5337 endMargin = a.getDimensionPixelSize( 5338 R.styleable.ViewGroup_MarginLayout_layout_marginEnd, DEFAULT_RELATIVE); 5339 } 5340 5341 a.recycle(); 5342 } 5343 5344 /** 5345 * {@inheritDoc} 5346 */ 5347 public MarginLayoutParams(int width, int height) { 5348 super(width, height); 5349 } 5350 5351 /** 5352 * Copy constructor. Clones the width, height and margin values of the source. 5353 * 5354 * @param source The layout params to copy from. 5355 */ 5356 public MarginLayoutParams(MarginLayoutParams source) { 5357 this.width = source.width; 5358 this.height = source.height; 5359 5360 this.leftMargin = source.leftMargin; 5361 this.topMargin = source.topMargin; 5362 this.rightMargin = source.rightMargin; 5363 this.bottomMargin = source.bottomMargin; 5364 this.startMargin = source.startMargin; 5365 this.endMargin = source.endMargin; 5366 } 5367 5368 /** 5369 * {@inheritDoc} 5370 */ 5371 public MarginLayoutParams(LayoutParams source) { 5372 super(source); 5373 } 5374 5375 /** 5376 * Sets the margins, in pixels. A call to {@link android.view.View#requestLayout()} needs 5377 * to be done so that the new margins are taken into account. Left and right margins may be 5378 * overriden by {@link android.view.View#requestLayout()} depending on layout direction. 5379 * 5380 * @param left the left margin size 5381 * @param top the top margin size 5382 * @param right the right margin size 5383 * @param bottom the bottom margin size 5384 * 5385 * @attr ref android.R.styleable#ViewGroup_MarginLayout_layout_marginLeft 5386 * @attr ref android.R.styleable#ViewGroup_MarginLayout_layout_marginTop 5387 * @attr ref android.R.styleable#ViewGroup_MarginLayout_layout_marginRight 5388 * @attr ref android.R.styleable#ViewGroup_MarginLayout_layout_marginBottom 5389 */ 5390 public void setMargins(int left, int top, int right, int bottom) { 5391 leftMargin = left; 5392 topMargin = top; 5393 rightMargin = right; 5394 bottomMargin = bottom; 5395 } 5396 5397 /** 5398 * Sets the relative margins, in pixels. A call to {@link android.view.View#requestLayout()} 5399 * needs to be done so that the new relative margins are taken into account. Left and right 5400 * margins may be overriden by {@link android.view.View#requestLayout()} depending on layout 5401 * direction. 5402 * 5403 * @param start the start margin size 5404 * @param top the top margin size 5405 * @param end the right margin size 5406 * @param bottom the bottom margin size 5407 * 5408 * @attr ref android.R.styleable#ViewGroup_MarginLayout_layout_marginStart 5409 * @attr ref android.R.styleable#ViewGroup_MarginLayout_layout_marginTop 5410 * @attr ref android.R.styleable#ViewGroup_MarginLayout_layout_marginEnd 5411 * @attr ref android.R.styleable#ViewGroup_MarginLayout_layout_marginBottom 5412 * 5413 * @hide 5414 */ 5415 public void setMarginsRelative(int start, int top, int end, int bottom) { 5416 startMargin = start; 5417 topMargin = top; 5418 endMargin = end; 5419 bottomMargin = bottom; 5420 } 5421 5422 /** 5423 * Returns the start margin in pixels. 5424 * 5425 * @attr ref android.R.styleable#ViewGroup_MarginLayout_layout_marginStart 5426 * 5427 * @return the start margin in pixels. 5428 * 5429 * @hide 5430 */ 5431 public int getMarginStart() { 5432 return startMargin; 5433 } 5434 5435 /** 5436 * Returns the end margin in pixels. 5437 * 5438 * @attr ref android.R.styleable#ViewGroup_MarginLayout_layout_marginEnd 5439 * 5440 * @return the end margin in pixels. 5441 * 5442 * @hide 5443 */ 5444 public int getMarginEnd() { 5445 return endMargin; 5446 } 5447 5448 /** 5449 * Check if margins are relative. 5450 * 5451 * @attr ref android.R.styleable#ViewGroup_MarginLayout_layout_marginStart 5452 * @attr ref android.R.styleable#ViewGroup_MarginLayout_layout_marginEnd 5453 * 5454 * @return true if either marginStart or marginEnd has been set 5455 * 5456 * @hide 5457 */ 5458 public boolean isMarginRelative() { 5459 return (startMargin != DEFAULT_RELATIVE) || (endMargin != DEFAULT_RELATIVE); 5460 } 5461 5462 /** 5463 * This will be called by {@link android.view.View#requestLayout()}. Left and Right margins 5464 * maybe overriden depending on layout direction. 5465 * 5466 * @hide 5467 */ 5468 @Override 5469 protected void resolveWithDirection(int layoutDirection) { 5470 switch(layoutDirection) { 5471 case View.LAYOUT_DIRECTION_RTL: 5472 leftMargin = (endMargin > DEFAULT_RELATIVE) ? endMargin : leftMargin; 5473 rightMargin = (startMargin > DEFAULT_RELATIVE) ? startMargin : rightMargin; 5474 break; 5475 case View.LAYOUT_DIRECTION_LTR: 5476 default: 5477 leftMargin = (startMargin > DEFAULT_RELATIVE) ? startMargin : leftMargin; 5478 rightMargin = (endMargin > DEFAULT_RELATIVE) ? endMargin : rightMargin; 5479 break; 5480 } 5481 } 5482 } 5483 5484 /* Describes a touched view and the ids of the pointers that it has captured. 5485 * 5486 * This code assumes that pointer ids are always in the range 0..31 such that 5487 * it can use a bitfield to track which pointer ids are present. 5488 * As it happens, the lower layers of the input dispatch pipeline also use the 5489 * same trick so the assumption should be safe here... 5490 */ 5491 private static final class TouchTarget { 5492 private static final int MAX_RECYCLED = 32; 5493 private static final Object sRecycleLock = new Object(); 5494 private static TouchTarget sRecycleBin; 5495 private static int sRecycledCount; 5496 5497 public static final int ALL_POINTER_IDS = -1; // all ones 5498 5499 // The touched child view. 5500 public View child; 5501 5502 // The combined bit mask of pointer ids for all pointers captured by the target. 5503 public int pointerIdBits; 5504 5505 // The next target in the target list. 5506 public TouchTarget next; 5507 5508 private TouchTarget() { 5509 } 5510 5511 public static TouchTarget obtain(View child, int pointerIdBits) { 5512 final TouchTarget target; 5513 synchronized (sRecycleLock) { 5514 if (sRecycleBin == null) { 5515 target = new TouchTarget(); 5516 } else { 5517 target = sRecycleBin; 5518 sRecycleBin = target.next; 5519 sRecycledCount--; 5520 target.next = null; 5521 } 5522 } 5523 target.child = child; 5524 target.pointerIdBits = pointerIdBits; 5525 return target; 5526 } 5527 5528 public void recycle() { 5529 synchronized (sRecycleLock) { 5530 if (sRecycledCount < MAX_RECYCLED) { 5531 next = sRecycleBin; 5532 sRecycleBin = this; 5533 sRecycledCount += 1; 5534 } else { 5535 next = null; 5536 } 5537 child = null; 5538 } 5539 } 5540 } 5541 5542 /* Describes a hovered view. */ 5543 private static final class HoverTarget { 5544 private static final int MAX_RECYCLED = 32; 5545 private static final Object sRecycleLock = new Object(); 5546 private static HoverTarget sRecycleBin; 5547 private static int sRecycledCount; 5548 5549 // The hovered child view. 5550 public View child; 5551 5552 // The next target in the target list. 5553 public HoverTarget next; 5554 5555 private HoverTarget() { 5556 } 5557 5558 public static HoverTarget obtain(View child) { 5559 final HoverTarget target; 5560 synchronized (sRecycleLock) { 5561 if (sRecycleBin == null) { 5562 target = new HoverTarget(); 5563 } else { 5564 target = sRecycleBin; 5565 sRecycleBin = target.next; 5566 sRecycledCount--; 5567 target.next = null; 5568 } 5569 } 5570 target.child = child; 5571 return target; 5572 } 5573 5574 public void recycle() { 5575 synchronized (sRecycleLock) { 5576 if (sRecycledCount < MAX_RECYCLED) { 5577 next = sRecycleBin; 5578 sRecycleBin = this; 5579 sRecycledCount += 1; 5580 } else { 5581 next = null; 5582 } 5583 child = null; 5584 } 5585 } 5586 } 5587} 5588