ViewGroup.java revision 0597161ee43cfaa7dbe14691a134fb358a00317a
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.Color; 26import android.graphics.Insets; 27import android.graphics.Matrix; 28import android.graphics.Paint; 29import android.graphics.PointF; 30import android.graphics.Rect; 31import android.graphics.RectF; 32import android.graphics.Region; 33import android.os.Build; 34import android.os.Parcelable; 35import android.os.SystemClock; 36import android.util.AttributeSet; 37import android.util.Log; 38import android.util.SparseArray; 39import android.view.accessibility.AccessibilityEvent; 40import android.view.accessibility.AccessibilityNodeInfo; 41import android.view.animation.Animation; 42import android.view.animation.AnimationUtils; 43import android.view.animation.LayoutAnimationController; 44import android.view.animation.Transformation; 45 46import com.android.internal.R; 47import com.android.internal.util.Predicate; 48 49import java.util.ArrayList; 50import java.util.Collections; 51import java.util.HashSet; 52 53/** 54 * <p> 55 * A <code>ViewGroup</code> is a special view that can contain other views 56 * (called children.) The view group is the base class for layouts and views 57 * containers. This class also defines the 58 * {@link android.view.ViewGroup.LayoutParams} class which serves as the base 59 * class for layouts parameters. 60 * </p> 61 * 62 * <p> 63 * Also see {@link LayoutParams} for layout attributes. 64 * </p> 65 * 66 * <div class="special reference"> 67 * <h3>Developer Guides</h3> 68 * <p>For more information about creating user interface layouts, read the 69 * <a href="{@docRoot}guide/topics/ui/declaring-layout.html">XML Layouts</a> developer 70 * guide.</p></div> 71 * 72 * @attr ref android.R.styleable#ViewGroup_clipChildren 73 * @attr ref android.R.styleable#ViewGroup_clipToPadding 74 * @attr ref android.R.styleable#ViewGroup_layoutAnimation 75 * @attr ref android.R.styleable#ViewGroup_animationCache 76 * @attr ref android.R.styleable#ViewGroup_persistentDrawingCache 77 * @attr ref android.R.styleable#ViewGroup_alwaysDrawnWithCache 78 * @attr ref android.R.styleable#ViewGroup_addStatesFromChildren 79 * @attr ref android.R.styleable#ViewGroup_descendantFocusability 80 * @attr ref android.R.styleable#ViewGroup_animateLayoutChanges 81 */ 82public abstract class ViewGroup extends View implements ViewParent, ViewManager { 83 private static final String TAG = "ViewGroup"; 84 85 private static final boolean DBG = false; 86 87 /** 88 * Views which have been hidden or removed which need to be animated on 89 * their way out. 90 * This field should be made private, so it is hidden from the SDK. 91 * {@hide} 92 */ 93 protected ArrayList<View> mDisappearingChildren; 94 95 /** 96 * Listener used to propagate events indicating when children are added 97 * and/or removed from a view group. 98 * This field should be made private, so it is hidden from the SDK. 99 * {@hide} 100 */ 101 protected OnHierarchyChangeListener mOnHierarchyChangeListener; 102 103 // The view contained within this ViewGroup that has or contains focus. 104 private View mFocused; 105 106 /** 107 * A Transformation used when drawing children, to 108 * apply on the child being drawn. 109 */ 110 final Transformation mChildTransformation = new Transformation(); 111 112 /** 113 * Used to track the current invalidation region. 114 */ 115 RectF mInvalidateRegion; 116 117 /** 118 * A Transformation used to calculate a correct 119 * invalidation area when the application is autoscaled. 120 */ 121 Transformation mInvalidationTransformation; 122 123 // View currently under an ongoing drag 124 private View mCurrentDragView; 125 126 // Metadata about the ongoing drag 127 private DragEvent mCurrentDrag; 128 private HashSet<View> mDragNotifiedChildren; 129 130 // Does this group have a child that can accept the current drag payload? 131 private boolean mChildAcceptsDrag; 132 133 // Used during drag dispatch 134 private final PointF mLocalPoint = new PointF(); 135 136 // Layout animation 137 private LayoutAnimationController mLayoutAnimationController; 138 private Animation.AnimationListener mAnimationListener; 139 140 // First touch target in the linked list of touch targets. 141 private TouchTarget mFirstTouchTarget; 142 143 // For debugging only. You can see these in hierarchyviewer. 144 @SuppressWarnings({"FieldCanBeLocal", "UnusedDeclaration"}) 145 @ViewDebug.ExportedProperty(category = "events") 146 private long mLastTouchDownTime; 147 @ViewDebug.ExportedProperty(category = "events") 148 private int mLastTouchDownIndex = -1; 149 @SuppressWarnings({"FieldCanBeLocal", "UnusedDeclaration"}) 150 @ViewDebug.ExportedProperty(category = "events") 151 private float mLastTouchDownX; 152 @SuppressWarnings({"FieldCanBeLocal", "UnusedDeclaration"}) 153 @ViewDebug.ExportedProperty(category = "events") 154 private float mLastTouchDownY; 155 156 // First hover target in the linked list of hover targets. 157 // The hover targets are children which have received ACTION_HOVER_ENTER. 158 // They might not have actually handled the hover event, but we will 159 // continue sending hover events to them as long as the pointer remains over 160 // their bounds and the view group does not intercept hover. 161 private HoverTarget mFirstHoverTarget; 162 163 // True if the view group itself received a hover event. 164 // It might not have actually handled the hover event. 165 private boolean mHoveredSelf; 166 167 /** 168 * Internal flags. 169 * 170 * This field should be made private, so it is hidden from the SDK. 171 * {@hide} 172 */ 173 protected int mGroupFlags; 174 175 /* 176 * The layout mode: either {@link #CLIP_BOUNDS} or {@link #OPTICAL_BOUNDS} 177 */ 178 private int mLayoutMode = CLIP_BOUNDS; 179 180 /** 181 * NOTE: If you change the flags below make sure to reflect the changes 182 * the DisplayList class 183 */ 184 185 // When set, ViewGroup invalidates only the child's rectangle 186 // Set by default 187 static final int FLAG_CLIP_CHILDREN = 0x1; 188 189 // When set, ViewGroup excludes the padding area from the invalidate rectangle 190 // Set by default 191 private static final int FLAG_CLIP_TO_PADDING = 0x2; 192 193 // When set, dispatchDraw() will invoke invalidate(); this is set by drawChild() when 194 // a child needs to be invalidated and FLAG_OPTIMIZE_INVALIDATE is set 195 static final int FLAG_INVALIDATE_REQUIRED = 0x4; 196 197 // When set, dispatchDraw() will run the layout animation and unset the flag 198 private static final int FLAG_RUN_ANIMATION = 0x8; 199 200 // When set, there is either no layout animation on the ViewGroup or the layout 201 // animation is over 202 // Set by default 203 static final int FLAG_ANIMATION_DONE = 0x10; 204 205 // If set, this ViewGroup has padding; if unset there is no padding and we don't need 206 // to clip it, even if FLAG_CLIP_TO_PADDING is set 207 private static final int FLAG_PADDING_NOT_NULL = 0x20; 208 209 // When set, this ViewGroup caches its children in a Bitmap before starting a layout animation 210 // Set by default 211 private static final int FLAG_ANIMATION_CACHE = 0x40; 212 213 // When set, this ViewGroup converts calls to invalidate(Rect) to invalidate() during a 214 // layout animation; this avoid clobbering the hierarchy 215 // Automatically set when the layout animation starts, depending on the animation's 216 // characteristics 217 static final int FLAG_OPTIMIZE_INVALIDATE = 0x80; 218 219 // When set, the next call to drawChild() will clear mChildTransformation's matrix 220 static final int FLAG_CLEAR_TRANSFORMATION = 0x100; 221 222 // When set, this ViewGroup invokes mAnimationListener.onAnimationEnd() and removes 223 // the children's Bitmap caches if necessary 224 // This flag is set when the layout animation is over (after FLAG_ANIMATION_DONE is set) 225 private static final int FLAG_NOTIFY_ANIMATION_LISTENER = 0x200; 226 227 /** 228 * When set, the drawing method will call {@link #getChildDrawingOrder(int, int)} 229 * to get the index of the child to draw for that iteration. 230 * 231 * @hide 232 */ 233 protected static final int FLAG_USE_CHILD_DRAWING_ORDER = 0x400; 234 235 /** 236 * When set, this ViewGroup supports static transformations on children; this causes 237 * {@link #getChildStaticTransformation(View, android.view.animation.Transformation)} to be 238 * invoked when a child is drawn. 239 * 240 * Any subclass overriding 241 * {@link #getChildStaticTransformation(View, android.view.animation.Transformation)} should 242 * set this flags in {@link #mGroupFlags}. 243 * 244 * {@hide} 245 */ 246 protected static final int FLAG_SUPPORT_STATIC_TRANSFORMATIONS = 0x800; 247 248 // When the previous drawChild() invocation used an alpha value that was lower than 249 // 1.0 and set it in mCachePaint 250 static final int FLAG_ALPHA_LOWER_THAN_ONE = 0x1000; 251 252 /** 253 * When set, this ViewGroup's drawable states also include those 254 * of its children. 255 */ 256 private static final int FLAG_ADD_STATES_FROM_CHILDREN = 0x2000; 257 258 /** 259 * When set, this ViewGroup tries to always draw its children using their drawing cache. 260 */ 261 static final int FLAG_ALWAYS_DRAWN_WITH_CACHE = 0x4000; 262 263 /** 264 * When set, and if FLAG_ALWAYS_DRAWN_WITH_CACHE is not set, this ViewGroup will try to 265 * draw its children with their drawing cache. 266 */ 267 static final int FLAG_CHILDREN_DRAWN_WITH_CACHE = 0x8000; 268 269 /** 270 * When set, this group will go through its list of children to notify them of 271 * any drawable state change. 272 */ 273 private static final int FLAG_NOTIFY_CHILDREN_ON_DRAWABLE_STATE_CHANGE = 0x10000; 274 275 private static final int FLAG_MASK_FOCUSABILITY = 0x60000; 276 277 /** 278 * This view will get focus before any of its descendants. 279 */ 280 public static final int FOCUS_BEFORE_DESCENDANTS = 0x20000; 281 282 /** 283 * This view will get focus only if none of its descendants want it. 284 */ 285 public static final int FOCUS_AFTER_DESCENDANTS = 0x40000; 286 287 /** 288 * This view will block any of its descendants from getting focus, even 289 * if they are focusable. 290 */ 291 public static final int FOCUS_BLOCK_DESCENDANTS = 0x60000; 292 293 /** 294 * Used to map between enum in attrubutes and flag values. 295 */ 296 private static final int[] DESCENDANT_FOCUSABILITY_FLAGS = 297 {FOCUS_BEFORE_DESCENDANTS, FOCUS_AFTER_DESCENDANTS, 298 FOCUS_BLOCK_DESCENDANTS}; 299 300 /** 301 * When set, this ViewGroup should not intercept touch events. 302 * {@hide} 303 */ 304 protected static final int FLAG_DISALLOW_INTERCEPT = 0x80000; 305 306 /** 307 * When set, this ViewGroup will split MotionEvents to multiple child Views when appropriate. 308 */ 309 private static final int FLAG_SPLIT_MOTION_EVENTS = 0x200000; 310 311 /** 312 * When set, this ViewGroup will not dispatch onAttachedToWindow calls 313 * to children when adding new views. This is used to prevent multiple 314 * onAttached calls when a ViewGroup adds children in its own onAttached method. 315 */ 316 private static final int FLAG_PREVENT_DISPATCH_ATTACHED_TO_WINDOW = 0x400000; 317 318 /** 319 * Indicates which types of drawing caches are to be kept in memory. 320 * This field should be made private, so it is hidden from the SDK. 321 * {@hide} 322 */ 323 protected int mPersistentDrawingCache; 324 325 /** 326 * Used to indicate that no drawing cache should be kept in memory. 327 */ 328 public static final int PERSISTENT_NO_CACHE = 0x0; 329 330 /** 331 * Used to indicate that the animation drawing cache should be kept in memory. 332 */ 333 public static final int PERSISTENT_ANIMATION_CACHE = 0x1; 334 335 /** 336 * Used to indicate that the scrolling drawing cache should be kept in memory. 337 */ 338 public static final int PERSISTENT_SCROLLING_CACHE = 0x2; 339 340 /** 341 * Used to indicate that all drawing caches should be kept in memory. 342 */ 343 public static final int PERSISTENT_ALL_CACHES = 0x3; 344 345 // Layout Modes 346 347 /** 348 * This constant is a {@link #setLayoutMode(int) layoutMode}. 349 * Clip bounds are the raw values of {@link #getLeft() left}, {@link #getTop() top}, 350 * {@link #getRight() right} and {@link #getBottom() bottom}. 351 * 352 * @hide 353 */ 354 public static final int CLIP_BOUNDS = 0; 355 356 /** 357 * This constant is a {@link #setLayoutMode(int) layoutMode}. 358 * Optical bounds describe where a widget appears to be. They sit inside the clip 359 * bounds which need to cover a larger area to allow other effects, 360 * such as shadows and glows, to be drawn. 361 * 362 * @hide 363 */ 364 public static final int OPTICAL_BOUNDS = 1; 365 366 /** 367 * We clip to padding when FLAG_CLIP_TO_PADDING and FLAG_PADDING_NOT_NULL 368 * are set at the same time. 369 */ 370 protected static final int CLIP_TO_PADDING_MASK = FLAG_CLIP_TO_PADDING | FLAG_PADDING_NOT_NULL; 371 372 // Index of the child's left position in the mLocation array 373 private static final int CHILD_LEFT_INDEX = 0; 374 // Index of the child's top position in the mLocation array 375 private static final int CHILD_TOP_INDEX = 1; 376 377 // Child views of this ViewGroup 378 private View[] mChildren; 379 // Number of valid children in the mChildren array, the rest should be null or not 380 // considered as children 381 382 private boolean mLayoutSuppressed = false; 383 384 private int mChildrenCount; 385 386 private static final int ARRAY_INITIAL_CAPACITY = 12; 387 private static final int ARRAY_CAPACITY_INCREMENT = 12; 388 389 private static Paint sDebugPaint; 390 private static float[] sDebugLines; 391 392 // Used to draw cached views 393 Paint mCachePaint; 394 395 // Used to animate add/remove changes in layout 396 private LayoutTransition mTransition; 397 398 // The set of views that are currently being transitioned. This list is used to track views 399 // being removed that should not actually be removed from the parent yet because they are 400 // being animated. 401 private ArrayList<View> mTransitioningViews; 402 403 // List of children changing visibility. This is used to potentially keep rendering 404 // views during a transition when they otherwise would have become gone/invisible 405 private ArrayList<View> mVisibilityChangingChildren; 406 407 // Indicates whether this container will use its children layers to draw 408 @ViewDebug.ExportedProperty(category = "drawing") 409 boolean mDrawLayers = true; 410 411 // Indicates how many of this container's child subtrees contain transient state 412 @ViewDebug.ExportedProperty(category = "layout") 413 private int mChildCountWithTransientState = 0; 414 415 public ViewGroup(Context context) { 416 super(context); 417 initViewGroup(); 418 } 419 420 public ViewGroup(Context context, AttributeSet attrs) { 421 super(context, attrs); 422 initViewGroup(); 423 initFromAttributes(context, attrs); 424 } 425 426 public ViewGroup(Context context, AttributeSet attrs, int defStyle) { 427 super(context, attrs, defStyle); 428 initViewGroup(); 429 initFromAttributes(context, attrs); 430 } 431 432 private boolean debugDraw() { 433 return mAttachInfo != null && mAttachInfo.mDebugLayout; 434 } 435 436 private void initViewGroup() { 437 // ViewGroup doesn't draw by default 438 if (!debugDraw()) { 439 setFlags(WILL_NOT_DRAW, DRAW_MASK); 440 } 441 mGroupFlags |= FLAG_CLIP_CHILDREN; 442 mGroupFlags |= FLAG_CLIP_TO_PADDING; 443 mGroupFlags |= FLAG_ANIMATION_DONE; 444 mGroupFlags |= FLAG_ANIMATION_CACHE; 445 mGroupFlags |= FLAG_ALWAYS_DRAWN_WITH_CACHE; 446 447 if (mContext.getApplicationInfo().targetSdkVersion >= Build.VERSION_CODES.HONEYCOMB) { 448 mGroupFlags |= FLAG_SPLIT_MOTION_EVENTS; 449 } 450 451 setDescendantFocusability(FOCUS_BEFORE_DESCENDANTS); 452 453 mChildren = new View[ARRAY_INITIAL_CAPACITY]; 454 mChildrenCount = 0; 455 456 mPersistentDrawingCache = PERSISTENT_SCROLLING_CACHE; 457 } 458 459 private void initFromAttributes(Context context, AttributeSet attrs) { 460 TypedArray a = context.obtainStyledAttributes(attrs, 461 R.styleable.ViewGroup); 462 463 final int N = a.getIndexCount(); 464 for (int i = 0; i < N; i++) { 465 int attr = a.getIndex(i); 466 switch (attr) { 467 case R.styleable.ViewGroup_clipChildren: 468 setClipChildren(a.getBoolean(attr, true)); 469 break; 470 case R.styleable.ViewGroup_clipToPadding: 471 setClipToPadding(a.getBoolean(attr, true)); 472 break; 473 case R.styleable.ViewGroup_animationCache: 474 setAnimationCacheEnabled(a.getBoolean(attr, true)); 475 break; 476 case R.styleable.ViewGroup_persistentDrawingCache: 477 setPersistentDrawingCache(a.getInt(attr, PERSISTENT_SCROLLING_CACHE)); 478 break; 479 case R.styleable.ViewGroup_addStatesFromChildren: 480 setAddStatesFromChildren(a.getBoolean(attr, false)); 481 break; 482 case R.styleable.ViewGroup_alwaysDrawnWithCache: 483 setAlwaysDrawnWithCacheEnabled(a.getBoolean(attr, true)); 484 break; 485 case R.styleable.ViewGroup_layoutAnimation: 486 int id = a.getResourceId(attr, -1); 487 if (id > 0) { 488 setLayoutAnimation(AnimationUtils.loadLayoutAnimation(mContext, id)); 489 } 490 break; 491 case R.styleable.ViewGroup_descendantFocusability: 492 setDescendantFocusability(DESCENDANT_FOCUSABILITY_FLAGS[a.getInt(attr, 0)]); 493 break; 494 case R.styleable.ViewGroup_splitMotionEvents: 495 setMotionEventSplittingEnabled(a.getBoolean(attr, false)); 496 break; 497 case R.styleable.ViewGroup_animateLayoutChanges: 498 boolean animateLayoutChanges = a.getBoolean(attr, false); 499 if (animateLayoutChanges) { 500 setLayoutTransition(new LayoutTransition()); 501 } 502 break; 503 } 504 } 505 506 a.recycle(); 507 } 508 509 /** 510 * Gets the descendant focusability of this view group. The descendant 511 * focusability defines the relationship between this view group and its 512 * descendants when looking for a view to take focus in 513 * {@link #requestFocus(int, android.graphics.Rect)}. 514 * 515 * @return one of {@link #FOCUS_BEFORE_DESCENDANTS}, {@link #FOCUS_AFTER_DESCENDANTS}, 516 * {@link #FOCUS_BLOCK_DESCENDANTS}. 517 */ 518 @ViewDebug.ExportedProperty(category = "focus", mapping = { 519 @ViewDebug.IntToString(from = FOCUS_BEFORE_DESCENDANTS, to = "FOCUS_BEFORE_DESCENDANTS"), 520 @ViewDebug.IntToString(from = FOCUS_AFTER_DESCENDANTS, to = "FOCUS_AFTER_DESCENDANTS"), 521 @ViewDebug.IntToString(from = FOCUS_BLOCK_DESCENDANTS, to = "FOCUS_BLOCK_DESCENDANTS") 522 }) 523 public int getDescendantFocusability() { 524 return mGroupFlags & FLAG_MASK_FOCUSABILITY; 525 } 526 527 /** 528 * Set the descendant focusability of this view group. This defines the relationship 529 * between this view group and its descendants when looking for a view to 530 * take focus in {@link #requestFocus(int, android.graphics.Rect)}. 531 * 532 * @param focusability one of {@link #FOCUS_BEFORE_DESCENDANTS}, {@link #FOCUS_AFTER_DESCENDANTS}, 533 * {@link #FOCUS_BLOCK_DESCENDANTS}. 534 */ 535 public void setDescendantFocusability(int focusability) { 536 switch (focusability) { 537 case FOCUS_BEFORE_DESCENDANTS: 538 case FOCUS_AFTER_DESCENDANTS: 539 case FOCUS_BLOCK_DESCENDANTS: 540 break; 541 default: 542 throw new IllegalArgumentException("must be one of FOCUS_BEFORE_DESCENDANTS, " 543 + "FOCUS_AFTER_DESCENDANTS, FOCUS_BLOCK_DESCENDANTS"); 544 } 545 mGroupFlags &= ~FLAG_MASK_FOCUSABILITY; 546 mGroupFlags |= (focusability & FLAG_MASK_FOCUSABILITY); 547 } 548 549 /** 550 * {@inheritDoc} 551 */ 552 @Override 553 void handleFocusGainInternal(int direction, Rect previouslyFocusedRect) { 554 if (mFocused != null) { 555 mFocused.unFocus(); 556 mFocused = null; 557 } 558 super.handleFocusGainInternal(direction, previouslyFocusedRect); 559 } 560 561 /** 562 * {@inheritDoc} 563 */ 564 public void requestChildFocus(View child, View focused) { 565 if (DBG) { 566 System.out.println(this + " requestChildFocus()"); 567 } 568 if (getDescendantFocusability() == FOCUS_BLOCK_DESCENDANTS) { 569 return; 570 } 571 572 // Unfocus us, if necessary 573 super.unFocus(); 574 575 // We had a previous notion of who had focus. Clear it. 576 if (mFocused != child) { 577 if (mFocused != null) { 578 mFocused.unFocus(); 579 } 580 581 mFocused = child; 582 } 583 if (mParent != null) { 584 mParent.requestChildFocus(this, focused); 585 } 586 } 587 588 /** 589 * {@inheritDoc} 590 */ 591 public void focusableViewAvailable(View v) { 592 if (mParent != null 593 // shortcut: don't report a new focusable view if we block our descendants from 594 // getting focus 595 && (getDescendantFocusability() != FOCUS_BLOCK_DESCENDANTS) 596 // shortcut: don't report a new focusable view if we already are focused 597 // (and we don't prefer our descendants) 598 // 599 // note: knowing that mFocused is non-null is not a good enough reason 600 // to break the traversal since in that case we'd actually have to find 601 // the focused view and make sure it wasn't FOCUS_AFTER_DESCENDANTS and 602 // an ancestor of v; this will get checked for at ViewAncestor 603 && !(isFocused() && getDescendantFocusability() != FOCUS_AFTER_DESCENDANTS)) { 604 mParent.focusableViewAvailable(v); 605 } 606 } 607 608 /** 609 * {@inheritDoc} 610 */ 611 public boolean showContextMenuForChild(View originalView) { 612 return mParent != null && mParent.showContextMenuForChild(originalView); 613 } 614 615 /** 616 * {@inheritDoc} 617 */ 618 public ActionMode startActionModeForChild(View originalView, ActionMode.Callback callback) { 619 return mParent != null ? mParent.startActionModeForChild(originalView, callback) : null; 620 } 621 622 /** 623 * Find the nearest view in the specified direction that wants to take 624 * focus. 625 * 626 * @param focused The view that currently has focus 627 * @param direction One of FOCUS_UP, FOCUS_DOWN, FOCUS_LEFT, and 628 * FOCUS_RIGHT, or 0 for not applicable. 629 */ 630 public View focusSearch(View focused, int direction) { 631 // If we are moving accessibility focus we want to consider all 632 // views no matter if they are on the screen. It is responsibility 633 // of the accessibility service to check whether the result is in 634 // the screen. 635 if (isRootNamespace() && (direction & FOCUS_ACCESSIBILITY) == 0) { 636 // root namespace means we should consider ourselves the top of the 637 // tree for focus searching; otherwise we could be focus searching 638 // into other tabs. see LocalActivityManager and TabHost for more info 639 return FocusFinder.getInstance().findNextFocus(this, focused, direction); 640 } else if (mParent != null) { 641 return mParent.focusSearch(focused, direction); 642 } 643 return null; 644 } 645 646 /** 647 * {@inheritDoc} 648 */ 649 public boolean requestChildRectangleOnScreen(View child, Rect rectangle, boolean immediate) { 650 return false; 651 } 652 653 /** 654 * {@inheritDoc} 655 */ 656 @Override 657 public boolean requestSendAccessibilityEvent(View child, AccessibilityEvent event) { 658 ViewParent parent = mParent; 659 if (parent == null) { 660 return false; 661 } 662 final boolean propagate = onRequestSendAccessibilityEvent(child, event); 663 if (!propagate) { 664 return false; 665 } 666 return parent.requestSendAccessibilityEvent(this, event); 667 } 668 669 /** 670 * Called when a child has requested sending an {@link AccessibilityEvent} and 671 * gives an opportunity to its parent to augment the event. 672 * <p> 673 * If an {@link android.view.View.AccessibilityDelegate} has been specified via calling 674 * {@link android.view.View#setAccessibilityDelegate(android.view.View.AccessibilityDelegate)} its 675 * {@link android.view.View.AccessibilityDelegate#onRequestSendAccessibilityEvent(ViewGroup, View, AccessibilityEvent)} 676 * is responsible for handling this call. 677 * </p> 678 * 679 * @param child The child which requests sending the event. 680 * @param event The event to be sent. 681 * @return True if the event should be sent. 682 * 683 * @see #requestSendAccessibilityEvent(View, AccessibilityEvent) 684 */ 685 public boolean onRequestSendAccessibilityEvent(View child, AccessibilityEvent event) { 686 if (mAccessibilityDelegate != null) { 687 return mAccessibilityDelegate.onRequestSendAccessibilityEvent(this, child, event); 688 } else { 689 return onRequestSendAccessibilityEventInternal(child, event); 690 } 691 } 692 693 /** 694 * @see #onRequestSendAccessibilityEvent(View, AccessibilityEvent) 695 * 696 * Note: Called from the default {@link View.AccessibilityDelegate}. 697 */ 698 boolean onRequestSendAccessibilityEventInternal(View child, AccessibilityEvent event) { 699 return true; 700 } 701 702 /** 703 * Called when a child view has changed whether or not it is tracking transient state. 704 * 705 * @hide 706 */ 707 public void childHasTransientStateChanged(View child, boolean childHasTransientState) { 708 final boolean oldHasTransientState = hasTransientState(); 709 if (childHasTransientState) { 710 mChildCountWithTransientState++; 711 } else { 712 mChildCountWithTransientState--; 713 } 714 715 final boolean newHasTransientState = hasTransientState(); 716 if (mParent != null && oldHasTransientState != newHasTransientState) { 717 try { 718 mParent.childHasTransientStateChanged(this, newHasTransientState); 719 } catch (AbstractMethodError e) { 720 Log.e(TAG, mParent.getClass().getSimpleName() + 721 " does not fully implement ViewParent", e); 722 } 723 } 724 } 725 726 /** 727 * @hide 728 */ 729 @Override 730 public boolean hasTransientState() { 731 return mChildCountWithTransientState > 0 || super.hasTransientState(); 732 } 733 734 /** 735 * {@inheritDoc} 736 */ 737 @Override 738 public boolean dispatchUnhandledMove(View focused, int direction) { 739 return mFocused != null && 740 mFocused.dispatchUnhandledMove(focused, direction); 741 } 742 743 /** 744 * {@inheritDoc} 745 */ 746 public void clearChildFocus(View child) { 747 if (DBG) { 748 System.out.println(this + " clearChildFocus()"); 749 } 750 751 mFocused = null; 752 if (mParent != null) { 753 mParent.clearChildFocus(this); 754 } 755 } 756 757 /** 758 * {@inheritDoc} 759 */ 760 @Override 761 public void clearFocus() { 762 if (DBG) { 763 System.out.println(this + " clearFocus()"); 764 } 765 if (mFocused == null) { 766 super.clearFocus(); 767 } else { 768 mFocused.clearFocus(); 769 mFocused = null; 770 } 771 } 772 773 /** 774 * {@inheritDoc} 775 */ 776 @Override 777 void unFocus() { 778 if (DBG) { 779 System.out.println(this + " unFocus()"); 780 } 781 if (mFocused == null) { 782 super.unFocus(); 783 } else { 784 mFocused.unFocus(); 785 mFocused = null; 786 } 787 } 788 789 /** 790 * Returns the focused child of this view, if any. The child may have focus 791 * or contain focus. 792 * 793 * @return the focused child or null. 794 */ 795 public View getFocusedChild() { 796 return mFocused; 797 } 798 799 /** 800 * Returns true if this view has or contains focus 801 * 802 * @return true if this view has or contains focus 803 */ 804 @Override 805 public boolean hasFocus() { 806 return (mPrivateFlags & FOCUSED) != 0 || mFocused != null; 807 } 808 809 /* 810 * (non-Javadoc) 811 * 812 * @see android.view.View#findFocus() 813 */ 814 @Override 815 public View findFocus() { 816 if (DBG) { 817 System.out.println("Find focus in " + this + ": flags=" 818 + isFocused() + ", child=" + mFocused); 819 } 820 821 if (isFocused()) { 822 return this; 823 } 824 825 if (mFocused != null) { 826 return mFocused.findFocus(); 827 } 828 return null; 829 } 830 831 /** 832 * {@inheritDoc} 833 */ 834 @Override 835 public boolean hasFocusable() { 836 if ((mViewFlags & VISIBILITY_MASK) != VISIBLE) { 837 return false; 838 } 839 840 if (isFocusable()) { 841 return true; 842 } 843 844 final int descendantFocusability = getDescendantFocusability(); 845 if (descendantFocusability != FOCUS_BLOCK_DESCENDANTS) { 846 final int count = mChildrenCount; 847 final View[] children = mChildren; 848 849 for (int i = 0; i < count; i++) { 850 final View child = children[i]; 851 if (child.hasFocusable()) { 852 return true; 853 } 854 } 855 } 856 857 return false; 858 } 859 860 /** 861 * {@inheritDoc} 862 */ 863 @Override 864 public void addFocusables(ArrayList<View> views, int direction, int focusableMode) { 865 final int focusableCount = views.size(); 866 867 final int descendantFocusability = getDescendantFocusability(); 868 869 if (descendantFocusability != FOCUS_BLOCK_DESCENDANTS 870 || (focusableMode & FOCUSABLES_ACCESSIBILITY) == FOCUSABLES_ACCESSIBILITY) { 871 final int count = mChildrenCount; 872 final View[] children = mChildren; 873 874 for (int i = 0; i < count; i++) { 875 final View child = children[i]; 876 if ((child.mViewFlags & VISIBILITY_MASK) == VISIBLE) { 877 child.addFocusables(views, direction, focusableMode); 878 } 879 } 880 } 881 882 // we add ourselves (if focusable) in all cases except for when we are 883 // FOCUS_AFTER_DESCENDANTS and there are some descendants focusable. this is 884 // to avoid the focus search finding layouts when a more precise search 885 // among the focusable children would be more interesting. 886 if (descendantFocusability != FOCUS_AFTER_DESCENDANTS 887 // No focusable descendants 888 || (focusableCount == views.size()) 889 // We are collecting accessibility focusables. 890 || (focusableMode & FOCUSABLES_ACCESSIBILITY) == FOCUSABLES_ACCESSIBILITY) { 891 super.addFocusables(views, direction, focusableMode); 892 } 893 } 894 895 @Override 896 public void findViewsWithText(ArrayList<View> outViews, CharSequence text, int flags) { 897 super.findViewsWithText(outViews, text, flags); 898 final int childrenCount = mChildrenCount; 899 final View[] children = mChildren; 900 for (int i = 0; i < childrenCount; i++) { 901 View child = children[i]; 902 if ((child.mViewFlags & VISIBILITY_MASK) == VISIBLE 903 && (child.mPrivateFlags & IS_ROOT_NAMESPACE) == 0) { 904 child.findViewsWithText(outViews, text, flags); 905 } 906 } 907 } 908 909 @Override 910 View findViewByAccessibilityIdTraversal(int accessibilityId) { 911 View foundView = super.findViewByAccessibilityIdTraversal(accessibilityId); 912 if (foundView != null) { 913 return foundView; 914 } 915 final int childrenCount = mChildrenCount; 916 final View[] children = mChildren; 917 for (int i = 0; i < childrenCount; i++) { 918 View child = children[i]; 919 foundView = child.findViewByAccessibilityIdTraversal(accessibilityId); 920 if (foundView != null) { 921 return foundView; 922 } 923 } 924 return null; 925 } 926 927 /** 928 * {@inheritDoc} 929 */ 930 @Override 931 public void dispatchWindowFocusChanged(boolean hasFocus) { 932 super.dispatchWindowFocusChanged(hasFocus); 933 final int count = mChildrenCount; 934 final View[] children = mChildren; 935 for (int i = 0; i < count; i++) { 936 children[i].dispatchWindowFocusChanged(hasFocus); 937 } 938 } 939 940 /** 941 * {@inheritDoc} 942 */ 943 @Override 944 public void addTouchables(ArrayList<View> views) { 945 super.addTouchables(views); 946 947 final int count = mChildrenCount; 948 final View[] children = mChildren; 949 950 for (int i = 0; i < count; i++) { 951 final View child = children[i]; 952 if ((child.mViewFlags & VISIBILITY_MASK) == VISIBLE) { 953 child.addTouchables(views); 954 } 955 } 956 } 957 958 /** 959 * @hide 960 */ 961 @Override 962 public void makeOptionalFitsSystemWindows() { 963 super.makeOptionalFitsSystemWindows(); 964 final int count = mChildrenCount; 965 final View[] children = mChildren; 966 for (int i = 0; i < count; i++) { 967 children[i].makeOptionalFitsSystemWindows(); 968 } 969 } 970 971 /** 972 * {@inheritDoc} 973 */ 974 @Override 975 public void dispatchDisplayHint(int hint) { 976 super.dispatchDisplayHint(hint); 977 final int count = mChildrenCount; 978 final View[] children = mChildren; 979 for (int i = 0; i < count; i++) { 980 children[i].dispatchDisplayHint(hint); 981 } 982 } 983 984 /** 985 * Called when a view's visibility has changed. Notify the parent to take any appropriate 986 * action. 987 * 988 * @param child The view whose visibility has changed 989 * @param oldVisibility The previous visibility value (GONE, INVISIBLE, or VISIBLE). 990 * @param newVisibility The new visibility value (GONE, INVISIBLE, or VISIBLE). 991 * @hide 992 */ 993 protected void onChildVisibilityChanged(View child, int oldVisibility, int newVisibility) { 994 if (mTransition != null) { 995 if (newVisibility == VISIBLE) { 996 mTransition.showChild(this, child, oldVisibility); 997 } else { 998 mTransition.hideChild(this, child, newVisibility); 999 // Only track this on disappearing views - appearing views are already visible 1000 // and don't need special handling during drawChild() 1001 if (mVisibilityChangingChildren == null) { 1002 mVisibilityChangingChildren = new ArrayList<View>(); 1003 } 1004 mVisibilityChangingChildren.add(child); 1005 if (mTransitioningViews != null && mTransitioningViews.contains(child)) { 1006 addDisappearingView(child); 1007 } 1008 } 1009 } 1010 1011 // in all cases, for drags 1012 if (mCurrentDrag != null) { 1013 if (newVisibility == VISIBLE) { 1014 notifyChildOfDrag(child); 1015 } 1016 } 1017 } 1018 1019 /** 1020 * {@inheritDoc} 1021 */ 1022 @Override 1023 protected void dispatchVisibilityChanged(View changedView, int visibility) { 1024 super.dispatchVisibilityChanged(changedView, visibility); 1025 final int count = mChildrenCount; 1026 final View[] children = mChildren; 1027 for (int i = 0; i < count; i++) { 1028 children[i].dispatchVisibilityChanged(changedView, visibility); 1029 } 1030 } 1031 1032 /** 1033 * {@inheritDoc} 1034 */ 1035 @Override 1036 public void dispatchWindowVisibilityChanged(int visibility) { 1037 super.dispatchWindowVisibilityChanged(visibility); 1038 final int count = mChildrenCount; 1039 final View[] children = mChildren; 1040 for (int i = 0; i < count; i++) { 1041 children[i].dispatchWindowVisibilityChanged(visibility); 1042 } 1043 } 1044 1045 /** 1046 * {@inheritDoc} 1047 */ 1048 @Override 1049 public void dispatchConfigurationChanged(Configuration newConfig) { 1050 super.dispatchConfigurationChanged(newConfig); 1051 final int count = mChildrenCount; 1052 final View[] children = mChildren; 1053 for (int i = 0; i < count; i++) { 1054 children[i].dispatchConfigurationChanged(newConfig); 1055 } 1056 } 1057 1058 /** 1059 * {@inheritDoc} 1060 */ 1061 public void recomputeViewAttributes(View child) { 1062 if (mAttachInfo != null && !mAttachInfo.mRecomputeGlobalAttributes) { 1063 ViewParent parent = mParent; 1064 if (parent != null) parent.recomputeViewAttributes(this); 1065 } 1066 } 1067 1068 @Override 1069 void dispatchCollectViewAttributes(AttachInfo attachInfo, int visibility) { 1070 if ((visibility & VISIBILITY_MASK) == VISIBLE) { 1071 super.dispatchCollectViewAttributes(attachInfo, visibility); 1072 final int count = mChildrenCount; 1073 final View[] children = mChildren; 1074 for (int i = 0; i < count; i++) { 1075 final View child = children[i]; 1076 child.dispatchCollectViewAttributes(attachInfo, 1077 visibility | (child.mViewFlags&VISIBILITY_MASK)); 1078 } 1079 } 1080 } 1081 1082 /** 1083 * {@inheritDoc} 1084 */ 1085 public void bringChildToFront(View child) { 1086 int index = indexOfChild(child); 1087 if (index >= 0) { 1088 removeFromArray(index); 1089 addInArray(child, mChildrenCount); 1090 child.mParent = this; 1091 } 1092 } 1093 1094 /** 1095 * {@inheritDoc} 1096 */ 1097 // TODO: Write real docs 1098 @Override 1099 public boolean dispatchDragEvent(DragEvent event) { 1100 boolean retval = false; 1101 final float tx = event.mX; 1102 final float ty = event.mY; 1103 1104 ViewRootImpl root = getViewRootImpl(); 1105 1106 // Dispatch down the view hierarchy 1107 switch (event.mAction) { 1108 case DragEvent.ACTION_DRAG_STARTED: { 1109 // clear state to recalculate which views we drag over 1110 mCurrentDragView = null; 1111 1112 // Set up our tracking of drag-started notifications 1113 mCurrentDrag = DragEvent.obtain(event); 1114 if (mDragNotifiedChildren == null) { 1115 mDragNotifiedChildren = new HashSet<View>(); 1116 } else { 1117 mDragNotifiedChildren.clear(); 1118 } 1119 1120 // Now dispatch down to our children, caching the responses 1121 mChildAcceptsDrag = false; 1122 final int count = mChildrenCount; 1123 final View[] children = mChildren; 1124 for (int i = 0; i < count; i++) { 1125 final View child = children[i]; 1126 child.mPrivateFlags2 &= ~View.DRAG_MASK; 1127 if (child.getVisibility() == VISIBLE) { 1128 final boolean handled = notifyChildOfDrag(children[i]); 1129 if (handled) { 1130 mChildAcceptsDrag = true; 1131 } 1132 } 1133 } 1134 1135 // Return HANDLED if one of our children can accept the drag 1136 if (mChildAcceptsDrag) { 1137 retval = true; 1138 } 1139 } break; 1140 1141 case DragEvent.ACTION_DRAG_ENDED: { 1142 // Release the bookkeeping now that the drag lifecycle has ended 1143 if (mDragNotifiedChildren != null) { 1144 for (View child : mDragNotifiedChildren) { 1145 // If a child was notified about an ongoing drag, it's told that it's over 1146 child.dispatchDragEvent(event); 1147 child.mPrivateFlags2 &= ~View.DRAG_MASK; 1148 child.refreshDrawableState(); 1149 } 1150 1151 mDragNotifiedChildren.clear(); 1152 mCurrentDrag.recycle(); 1153 mCurrentDrag = null; 1154 } 1155 1156 // We consider drag-ended to have been handled if one of our children 1157 // had offered to handle the drag. 1158 if (mChildAcceptsDrag) { 1159 retval = true; 1160 } 1161 } break; 1162 1163 case DragEvent.ACTION_DRAG_LOCATION: { 1164 // Find the [possibly new] drag target 1165 final View target = findFrontmostDroppableChildAt(event.mX, event.mY, mLocalPoint); 1166 1167 // If we've changed apparent drag target, tell the view root which view 1168 // we're over now [for purposes of the eventual drag-recipient-changed 1169 // notifications to the framework] and tell the new target that the drag 1170 // has entered its bounds. The root will see setDragFocus() calls all 1171 // the way down to the final leaf view that is handling the LOCATION event 1172 // before reporting the new potential recipient to the framework. 1173 if (mCurrentDragView != target) { 1174 root.setDragFocus(target); 1175 1176 final int action = event.mAction; 1177 // If we've dragged off of a child view, send it the EXITED message 1178 if (mCurrentDragView != null) { 1179 final View view = mCurrentDragView; 1180 event.mAction = DragEvent.ACTION_DRAG_EXITED; 1181 view.dispatchDragEvent(event); 1182 view.mPrivateFlags2 &= ~View.DRAG_HOVERED; 1183 view.refreshDrawableState(); 1184 } 1185 mCurrentDragView = target; 1186 1187 // If we've dragged over a new child view, send it the ENTERED message 1188 if (target != null) { 1189 event.mAction = DragEvent.ACTION_DRAG_ENTERED; 1190 target.dispatchDragEvent(event); 1191 target.mPrivateFlags2 |= View.DRAG_HOVERED; 1192 target.refreshDrawableState(); 1193 } 1194 event.mAction = action; // restore the event's original state 1195 } 1196 1197 // Dispatch the actual drag location notice, localized into its coordinates 1198 if (target != null) { 1199 event.mX = mLocalPoint.x; 1200 event.mY = mLocalPoint.y; 1201 1202 retval = target.dispatchDragEvent(event); 1203 1204 event.mX = tx; 1205 event.mY = ty; 1206 } 1207 } break; 1208 1209 /* Entered / exited dispatch 1210 * 1211 * DRAG_ENTERED is not dispatched downwards from ViewGroup. The reason for this is 1212 * that we're about to get the corresponding LOCATION event, which we will use to 1213 * determine which of our children is the new target; at that point we will 1214 * push a DRAG_ENTERED down to the new target child [which may itself be a ViewGroup]. 1215 * 1216 * DRAG_EXITED *is* dispatched all the way down immediately: once we know the 1217 * drag has left this ViewGroup, we know by definition that every contained subview 1218 * is also no longer under the drag point. 1219 */ 1220 1221 case DragEvent.ACTION_DRAG_EXITED: { 1222 if (mCurrentDragView != null) { 1223 final View view = mCurrentDragView; 1224 view.dispatchDragEvent(event); 1225 view.mPrivateFlags2 &= ~View.DRAG_HOVERED; 1226 view.refreshDrawableState(); 1227 1228 mCurrentDragView = null; 1229 } 1230 } break; 1231 1232 case DragEvent.ACTION_DROP: { 1233 if (ViewDebug.DEBUG_DRAG) Log.d(View.VIEW_LOG_TAG, "Drop event: " + event); 1234 View target = findFrontmostDroppableChildAt(event.mX, event.mY, mLocalPoint); 1235 if (target != null) { 1236 if (ViewDebug.DEBUG_DRAG) Log.d(View.VIEW_LOG_TAG, " dispatch drop to " + target); 1237 event.mX = mLocalPoint.x; 1238 event.mY = mLocalPoint.y; 1239 retval = target.dispatchDragEvent(event); 1240 event.mX = tx; 1241 event.mY = ty; 1242 } else { 1243 if (ViewDebug.DEBUG_DRAG) { 1244 Log.d(View.VIEW_LOG_TAG, " not dropped on an accepting view"); 1245 } 1246 } 1247 } break; 1248 } 1249 1250 // If none of our children could handle the event, try here 1251 if (!retval) { 1252 // Call up to the View implementation that dispatches to installed listeners 1253 retval = super.dispatchDragEvent(event); 1254 } 1255 return retval; 1256 } 1257 1258 // Find the frontmost child view that lies under the given point, and calculate 1259 // the position within its own local coordinate system. 1260 View findFrontmostDroppableChildAt(float x, float y, PointF outLocalPoint) { 1261 final int count = mChildrenCount; 1262 final View[] children = mChildren; 1263 for (int i = count - 1; i >= 0; i--) { 1264 final View child = children[i]; 1265 if (!child.canAcceptDrag()) { 1266 continue; 1267 } 1268 1269 if (isTransformedTouchPointInView(x, y, child, outLocalPoint)) { 1270 return child; 1271 } 1272 } 1273 return null; 1274 } 1275 1276 boolean notifyChildOfDrag(View child) { 1277 if (ViewDebug.DEBUG_DRAG) { 1278 Log.d(View.VIEW_LOG_TAG, "Sending drag-started to view: " + child); 1279 } 1280 1281 boolean canAccept = false; 1282 if (! mDragNotifiedChildren.contains(child)) { 1283 mDragNotifiedChildren.add(child); 1284 canAccept = child.dispatchDragEvent(mCurrentDrag); 1285 if (canAccept && !child.canAcceptDrag()) { 1286 child.mPrivateFlags2 |= View.DRAG_CAN_ACCEPT; 1287 child.refreshDrawableState(); 1288 } 1289 } 1290 return canAccept; 1291 } 1292 1293 @Override 1294 public void dispatchWindowSystemUiVisiblityChanged(int visible) { 1295 super.dispatchWindowSystemUiVisiblityChanged(visible); 1296 1297 final int count = mChildrenCount; 1298 final View[] children = mChildren; 1299 for (int i=0; i <count; i++) { 1300 final View child = children[i]; 1301 child.dispatchWindowSystemUiVisiblityChanged(visible); 1302 } 1303 } 1304 1305 @Override 1306 public void dispatchSystemUiVisibilityChanged(int visible) { 1307 super.dispatchSystemUiVisibilityChanged(visible); 1308 1309 final int count = mChildrenCount; 1310 final View[] children = mChildren; 1311 for (int i=0; i <count; i++) { 1312 final View child = children[i]; 1313 child.dispatchSystemUiVisibilityChanged(visible); 1314 } 1315 } 1316 1317 @Override 1318 boolean updateLocalSystemUiVisibility(int localValue, int localChanges) { 1319 boolean changed = super.updateLocalSystemUiVisibility(localValue, localChanges); 1320 1321 final int count = mChildrenCount; 1322 final View[] children = mChildren; 1323 for (int i=0; i <count; i++) { 1324 final View child = children[i]; 1325 changed |= child.updateLocalSystemUiVisibility(localValue, localChanges); 1326 } 1327 return changed; 1328 } 1329 1330 /** 1331 * {@inheritDoc} 1332 */ 1333 @Override 1334 public boolean dispatchKeyEventPreIme(KeyEvent event) { 1335 if ((mPrivateFlags & (FOCUSED | HAS_BOUNDS)) == (FOCUSED | HAS_BOUNDS)) { 1336 return super.dispatchKeyEventPreIme(event); 1337 } else if (mFocused != null && (mFocused.mPrivateFlags & HAS_BOUNDS) == HAS_BOUNDS) { 1338 return mFocused.dispatchKeyEventPreIme(event); 1339 } 1340 return false; 1341 } 1342 1343 /** 1344 * {@inheritDoc} 1345 */ 1346 @Override 1347 public boolean dispatchKeyEvent(KeyEvent event) { 1348 if (mInputEventConsistencyVerifier != null) { 1349 mInputEventConsistencyVerifier.onKeyEvent(event, 1); 1350 } 1351 1352 if ((mPrivateFlags & (FOCUSED | HAS_BOUNDS)) == (FOCUSED | HAS_BOUNDS)) { 1353 if (super.dispatchKeyEvent(event)) { 1354 return true; 1355 } 1356 } else if (mFocused != null && (mFocused.mPrivateFlags & HAS_BOUNDS) == HAS_BOUNDS) { 1357 if (mFocused.dispatchKeyEvent(event)) { 1358 return true; 1359 } 1360 } 1361 1362 if (mInputEventConsistencyVerifier != null) { 1363 mInputEventConsistencyVerifier.onUnhandledEvent(event, 1); 1364 } 1365 return false; 1366 } 1367 1368 /** 1369 * {@inheritDoc} 1370 */ 1371 @Override 1372 public boolean dispatchKeyShortcutEvent(KeyEvent event) { 1373 if ((mPrivateFlags & (FOCUSED | HAS_BOUNDS)) == (FOCUSED | HAS_BOUNDS)) { 1374 return super.dispatchKeyShortcutEvent(event); 1375 } else if (mFocused != null && (mFocused.mPrivateFlags & HAS_BOUNDS) == HAS_BOUNDS) { 1376 return mFocused.dispatchKeyShortcutEvent(event); 1377 } 1378 return false; 1379 } 1380 1381 /** 1382 * {@inheritDoc} 1383 */ 1384 @Override 1385 public boolean dispatchTrackballEvent(MotionEvent event) { 1386 if (mInputEventConsistencyVerifier != null) { 1387 mInputEventConsistencyVerifier.onTrackballEvent(event, 1); 1388 } 1389 1390 if ((mPrivateFlags & (FOCUSED | HAS_BOUNDS)) == (FOCUSED | HAS_BOUNDS)) { 1391 if (super.dispatchTrackballEvent(event)) { 1392 return true; 1393 } 1394 } else if (mFocused != null && (mFocused.mPrivateFlags & HAS_BOUNDS) == HAS_BOUNDS) { 1395 if (mFocused.dispatchTrackballEvent(event)) { 1396 return true; 1397 } 1398 } 1399 1400 if (mInputEventConsistencyVerifier != null) { 1401 mInputEventConsistencyVerifier.onUnhandledEvent(event, 1); 1402 } 1403 return false; 1404 } 1405 1406 /** 1407 * {@inheritDoc} 1408 */ 1409 @SuppressWarnings({"ConstantConditions"}) 1410 @Override 1411 protected boolean dispatchHoverEvent(MotionEvent event) { 1412 final int action = event.getAction(); 1413 1414 // First check whether the view group wants to intercept the hover event. 1415 final boolean interceptHover = onInterceptHoverEvent(event); 1416 event.setAction(action); // restore action in case it was changed 1417 1418 MotionEvent eventNoHistory = event; 1419 boolean handled = false; 1420 1421 // Send events to the hovered children and build a new list of hover targets until 1422 // one is found that handles the event. 1423 HoverTarget firstOldHoverTarget = mFirstHoverTarget; 1424 mFirstHoverTarget = null; 1425 if (!interceptHover && action != MotionEvent.ACTION_HOVER_EXIT) { 1426 final float x = event.getX(); 1427 final float y = event.getY(); 1428 final int childrenCount = mChildrenCount; 1429 if (childrenCount != 0) { 1430 final View[] children = mChildren; 1431 HoverTarget lastHoverTarget = null; 1432 for (int i = childrenCount - 1; i >= 0; i--) { 1433 final View child = children[i]; 1434 if (!canViewReceivePointerEvents(child) 1435 || !isTransformedTouchPointInView(x, y, child, null)) { 1436 continue; 1437 } 1438 1439 // Obtain a hover target for this child. Dequeue it from the 1440 // old hover target list if the child was previously hovered. 1441 HoverTarget hoverTarget = firstOldHoverTarget; 1442 final boolean wasHovered; 1443 for (HoverTarget predecessor = null; ;) { 1444 if (hoverTarget == null) { 1445 hoverTarget = HoverTarget.obtain(child); 1446 wasHovered = false; 1447 break; 1448 } 1449 1450 if (hoverTarget.child == child) { 1451 if (predecessor != null) { 1452 predecessor.next = hoverTarget.next; 1453 } else { 1454 firstOldHoverTarget = hoverTarget.next; 1455 } 1456 hoverTarget.next = null; 1457 wasHovered = true; 1458 break; 1459 } 1460 1461 predecessor = hoverTarget; 1462 hoverTarget = hoverTarget.next; 1463 } 1464 1465 // Enqueue the hover target onto the new hover target list. 1466 if (lastHoverTarget != null) { 1467 lastHoverTarget.next = hoverTarget; 1468 } else { 1469 lastHoverTarget = hoverTarget; 1470 mFirstHoverTarget = hoverTarget; 1471 } 1472 1473 // Dispatch the event to the child. 1474 if (action == MotionEvent.ACTION_HOVER_ENTER) { 1475 if (!wasHovered) { 1476 // Send the enter as is. 1477 handled |= dispatchTransformedGenericPointerEvent( 1478 event, child); // enter 1479 } 1480 } else if (action == MotionEvent.ACTION_HOVER_MOVE) { 1481 if (!wasHovered) { 1482 // Synthesize an enter from a move. 1483 eventNoHistory = obtainMotionEventNoHistoryOrSelf(eventNoHistory); 1484 eventNoHistory.setAction(MotionEvent.ACTION_HOVER_ENTER); 1485 handled |= dispatchTransformedGenericPointerEvent( 1486 eventNoHistory, child); // enter 1487 eventNoHistory.setAction(action); 1488 1489 handled |= dispatchTransformedGenericPointerEvent( 1490 eventNoHistory, child); // move 1491 } else { 1492 // Send the move as is. 1493 handled |= dispatchTransformedGenericPointerEvent(event, child); 1494 } 1495 } 1496 if (handled) { 1497 break; 1498 } 1499 } 1500 } 1501 } 1502 1503 // Send exit events to all previously hovered children that are no longer hovered. 1504 while (firstOldHoverTarget != null) { 1505 final View child = firstOldHoverTarget.child; 1506 1507 // Exit the old hovered child. 1508 if (action == MotionEvent.ACTION_HOVER_EXIT) { 1509 // Send the exit as is. 1510 handled |= dispatchTransformedGenericPointerEvent( 1511 event, child); // exit 1512 } else { 1513 // Synthesize an exit from a move or enter. 1514 // Ignore the result because hover focus has moved to a different view. 1515 if (action == MotionEvent.ACTION_HOVER_MOVE) { 1516 dispatchTransformedGenericPointerEvent( 1517 event, child); // move 1518 } 1519 eventNoHistory = obtainMotionEventNoHistoryOrSelf(eventNoHistory); 1520 eventNoHistory.setAction(MotionEvent.ACTION_HOVER_EXIT); 1521 dispatchTransformedGenericPointerEvent( 1522 eventNoHistory, child); // exit 1523 eventNoHistory.setAction(action); 1524 } 1525 1526 final HoverTarget nextOldHoverTarget = firstOldHoverTarget.next; 1527 firstOldHoverTarget.recycle(); 1528 firstOldHoverTarget = nextOldHoverTarget; 1529 } 1530 1531 // Send events to the view group itself if no children have handled it. 1532 boolean newHoveredSelf = !handled; 1533 if (newHoveredSelf == mHoveredSelf) { 1534 if (newHoveredSelf) { 1535 // Send event to the view group as before. 1536 handled |= super.dispatchHoverEvent(event); 1537 } 1538 } else { 1539 if (mHoveredSelf) { 1540 // Exit the view group. 1541 if (action == MotionEvent.ACTION_HOVER_EXIT) { 1542 // Send the exit as is. 1543 handled |= super.dispatchHoverEvent(event); // exit 1544 } else { 1545 // Synthesize an exit from a move or enter. 1546 // Ignore the result because hover focus is moving to a different view. 1547 if (action == MotionEvent.ACTION_HOVER_MOVE) { 1548 super.dispatchHoverEvent(event); // move 1549 } 1550 eventNoHistory = obtainMotionEventNoHistoryOrSelf(eventNoHistory); 1551 eventNoHistory.setAction(MotionEvent.ACTION_HOVER_EXIT); 1552 super.dispatchHoverEvent(eventNoHistory); // exit 1553 eventNoHistory.setAction(action); 1554 } 1555 mHoveredSelf = false; 1556 } 1557 1558 if (newHoveredSelf) { 1559 // Enter the view group. 1560 if (action == MotionEvent.ACTION_HOVER_ENTER) { 1561 // Send the enter as is. 1562 handled |= super.dispatchHoverEvent(event); // enter 1563 mHoveredSelf = true; 1564 } else if (action == MotionEvent.ACTION_HOVER_MOVE) { 1565 // Synthesize an enter from a move. 1566 eventNoHistory = obtainMotionEventNoHistoryOrSelf(eventNoHistory); 1567 eventNoHistory.setAction(MotionEvent.ACTION_HOVER_ENTER); 1568 handled |= super.dispatchHoverEvent(eventNoHistory); // enter 1569 eventNoHistory.setAction(action); 1570 1571 handled |= super.dispatchHoverEvent(eventNoHistory); // move 1572 mHoveredSelf = true; 1573 } 1574 } 1575 } 1576 1577 // Recycle the copy of the event that we made. 1578 if (eventNoHistory != event) { 1579 eventNoHistory.recycle(); 1580 } 1581 1582 // Done. 1583 return handled; 1584 } 1585 1586 private void exitHoverTargets() { 1587 if (mHoveredSelf || mFirstHoverTarget != null) { 1588 final long now = SystemClock.uptimeMillis(); 1589 MotionEvent event = MotionEvent.obtain(now, now, 1590 MotionEvent.ACTION_HOVER_EXIT, 0.0f, 0.0f, 0); 1591 event.setSource(InputDevice.SOURCE_TOUCHSCREEN); 1592 dispatchHoverEvent(event); 1593 event.recycle(); 1594 } 1595 } 1596 1597 private void cancelHoverTarget(View view) { 1598 HoverTarget predecessor = null; 1599 HoverTarget target = mFirstHoverTarget; 1600 while (target != null) { 1601 final HoverTarget next = target.next; 1602 if (target.child == view) { 1603 if (predecessor == null) { 1604 mFirstHoverTarget = next; 1605 } else { 1606 predecessor.next = next; 1607 } 1608 target.recycle(); 1609 1610 final long now = SystemClock.uptimeMillis(); 1611 MotionEvent event = MotionEvent.obtain(now, now, 1612 MotionEvent.ACTION_HOVER_EXIT, 0.0f, 0.0f, 0); 1613 event.setSource(InputDevice.SOURCE_TOUCHSCREEN); 1614 view.dispatchHoverEvent(event); 1615 event.recycle(); 1616 return; 1617 } 1618 predecessor = target; 1619 target = next; 1620 } 1621 } 1622 1623 /** @hide */ 1624 @Override 1625 protected boolean hasHoveredChild() { 1626 return mFirstHoverTarget != null; 1627 } 1628 1629 @Override 1630 public void addChildrenForAccessibility(ArrayList<View> childrenForAccessibility) { 1631 ChildListForAccessibility children = ChildListForAccessibility.obtain(this, true); 1632 try { 1633 final int childrenCount = children.getChildCount(); 1634 for (int i = 0; i < childrenCount; i++) { 1635 View child = children.getChildAt(i); 1636 if ((child.mViewFlags & VISIBILITY_MASK) == VISIBLE) { 1637 if (child.includeForAccessibility()) { 1638 childrenForAccessibility.add(child); 1639 } else { 1640 child.addChildrenForAccessibility(childrenForAccessibility); 1641 } 1642 } 1643 } 1644 } finally { 1645 children.recycle(); 1646 } 1647 } 1648 1649 /** 1650 * @hide 1651 */ 1652 @Override 1653 public void childAccessibilityStateChanged(View child) { 1654 if (mParent != null) { 1655 mParent.childAccessibilityStateChanged(child); 1656 } 1657 } 1658 1659 /** 1660 * @hide 1661 */ 1662 @Override 1663 public View findViewToTakeAccessibilityFocusFromHover(View child, View descendant) { 1664 if (includeForAccessibility() && isActionableForAccessibility()) { 1665 return this; 1666 } 1667 if (mParent != null) { 1668 return mParent.findViewToTakeAccessibilityFocusFromHover(this, descendant); 1669 } 1670 return null; 1671 } 1672 1673 /** 1674 * Implement this method to intercept hover events before they are handled 1675 * by child views. 1676 * <p> 1677 * This method is called before dispatching a hover event to a child of 1678 * the view group or to the view group's own {@link #onHoverEvent} to allow 1679 * the view group a chance to intercept the hover event. 1680 * This method can also be used to watch all pointer motions that occur within 1681 * the bounds of the view group even when the pointer is hovering over 1682 * a child of the view group rather than over the view group itself. 1683 * </p><p> 1684 * The view group can prevent its children from receiving hover events by 1685 * implementing this method and returning <code>true</code> to indicate 1686 * that it would like to intercept hover events. The view group must 1687 * continuously return <code>true</code> from {@link #onInterceptHoverEvent} 1688 * for as long as it wishes to continue intercepting hover events from 1689 * its children. 1690 * </p><p> 1691 * Interception preserves the invariant that at most one view can be 1692 * hovered at a time by transferring hover focus from the currently hovered 1693 * child to the view group or vice-versa as needed. 1694 * </p><p> 1695 * If this method returns <code>true</code> and a child is already hovered, then the 1696 * child view will first receive a hover exit event and then the view group 1697 * itself will receive a hover enter event in {@link #onHoverEvent}. 1698 * Likewise, if this method had previously returned <code>true</code> to intercept hover 1699 * events and instead returns <code>false</code> while the pointer is hovering 1700 * within the bounds of one of a child, then the view group will first receive a 1701 * hover exit event in {@link #onHoverEvent} and then the hovered child will 1702 * receive a hover enter event. 1703 * </p><p> 1704 * The default implementation always returns false. 1705 * </p> 1706 * 1707 * @param event The motion event that describes the hover. 1708 * @return True if the view group would like to intercept the hover event 1709 * and prevent its children from receiving it. 1710 */ 1711 public boolean onInterceptHoverEvent(MotionEvent event) { 1712 return false; 1713 } 1714 1715 private static MotionEvent obtainMotionEventNoHistoryOrSelf(MotionEvent event) { 1716 if (event.getHistorySize() == 0) { 1717 return event; 1718 } 1719 return MotionEvent.obtainNoHistory(event); 1720 } 1721 1722 /** 1723 * {@inheritDoc} 1724 */ 1725 @Override 1726 protected boolean dispatchGenericPointerEvent(MotionEvent event) { 1727 // Send the event to the child under the pointer. 1728 final int childrenCount = mChildrenCount; 1729 if (childrenCount != 0) { 1730 final View[] children = mChildren; 1731 final float x = event.getX(); 1732 final float y = event.getY(); 1733 1734 for (int i = childrenCount - 1; i >= 0; i--) { 1735 final View child = children[i]; 1736 if (!canViewReceivePointerEvents(child) 1737 || !isTransformedTouchPointInView(x, y, child, null)) { 1738 continue; 1739 } 1740 1741 if (dispatchTransformedGenericPointerEvent(event, child)) { 1742 return true; 1743 } 1744 } 1745 } 1746 1747 // No child handled the event. Send it to this view group. 1748 return super.dispatchGenericPointerEvent(event); 1749 } 1750 1751 /** 1752 * {@inheritDoc} 1753 */ 1754 @Override 1755 protected boolean dispatchGenericFocusedEvent(MotionEvent event) { 1756 // Send the event to the focused child or to this view group if it has focus. 1757 if ((mPrivateFlags & (FOCUSED | HAS_BOUNDS)) == (FOCUSED | HAS_BOUNDS)) { 1758 return super.dispatchGenericFocusedEvent(event); 1759 } else if (mFocused != null && (mFocused.mPrivateFlags & HAS_BOUNDS) == HAS_BOUNDS) { 1760 return mFocused.dispatchGenericMotionEvent(event); 1761 } 1762 return false; 1763 } 1764 1765 /** 1766 * Dispatches a generic pointer event to a child, taking into account 1767 * transformations that apply to the child. 1768 * 1769 * @param event The event to send. 1770 * @param child The view to send the event to. 1771 * @return {@code true} if the child handled the event. 1772 */ 1773 private boolean dispatchTransformedGenericPointerEvent(MotionEvent event, View child) { 1774 final float offsetX = mScrollX - child.mLeft; 1775 final float offsetY = mScrollY - child.mTop; 1776 1777 boolean handled; 1778 if (!child.hasIdentityMatrix()) { 1779 MotionEvent transformedEvent = MotionEvent.obtain(event); 1780 transformedEvent.offsetLocation(offsetX, offsetY); 1781 transformedEvent.transform(child.getInverseMatrix()); 1782 handled = child.dispatchGenericMotionEvent(transformedEvent); 1783 transformedEvent.recycle(); 1784 } else { 1785 event.offsetLocation(offsetX, offsetY); 1786 handled = child.dispatchGenericMotionEvent(event); 1787 event.offsetLocation(-offsetX, -offsetY); 1788 } 1789 return handled; 1790 } 1791 1792 /** 1793 * {@inheritDoc} 1794 */ 1795 @Override 1796 public boolean dispatchTouchEvent(MotionEvent ev) { 1797 if (mInputEventConsistencyVerifier != null) { 1798 mInputEventConsistencyVerifier.onTouchEvent(ev, 1); 1799 } 1800 1801 boolean handled = false; 1802 if (onFilterTouchEventForSecurity(ev)) { 1803 final int action = ev.getAction(); 1804 final int actionMasked = action & MotionEvent.ACTION_MASK; 1805 1806 // Handle an initial down. 1807 if (actionMasked == MotionEvent.ACTION_DOWN) { 1808 // Throw away all previous state when starting a new touch gesture. 1809 // The framework may have dropped the up or cancel event for the previous gesture 1810 // due to an app switch, ANR, or some other state change. 1811 cancelAndClearTouchTargets(ev); 1812 resetTouchState(); 1813 } 1814 1815 // Check for interception. 1816 final boolean intercepted; 1817 if (actionMasked == MotionEvent.ACTION_DOWN 1818 || mFirstTouchTarget != null) { 1819 final boolean disallowIntercept = (mGroupFlags & FLAG_DISALLOW_INTERCEPT) != 0; 1820 if (!disallowIntercept) { 1821 intercepted = onInterceptTouchEvent(ev); 1822 ev.setAction(action); // restore action in case it was changed 1823 } else { 1824 intercepted = false; 1825 } 1826 } else { 1827 // There are no touch targets and this action is not an initial down 1828 // so this view group continues to intercept touches. 1829 intercepted = true; 1830 } 1831 1832 // Check for cancelation. 1833 final boolean canceled = resetCancelNextUpFlag(this) 1834 || actionMasked == MotionEvent.ACTION_CANCEL; 1835 1836 // Update list of touch targets for pointer down, if needed. 1837 final boolean split = (mGroupFlags & FLAG_SPLIT_MOTION_EVENTS) != 0; 1838 TouchTarget newTouchTarget = null; 1839 boolean alreadyDispatchedToNewTouchTarget = false; 1840 if (!canceled && !intercepted) { 1841 if (actionMasked == MotionEvent.ACTION_DOWN 1842 || (split && actionMasked == MotionEvent.ACTION_POINTER_DOWN) 1843 || actionMasked == MotionEvent.ACTION_HOVER_MOVE) { 1844 final int actionIndex = ev.getActionIndex(); // always 0 for down 1845 final int idBitsToAssign = split ? 1 << ev.getPointerId(actionIndex) 1846 : TouchTarget.ALL_POINTER_IDS; 1847 1848 // Clean up earlier touch targets for this pointer id in case they 1849 // have become out of sync. 1850 removePointersFromTouchTargets(idBitsToAssign); 1851 1852 final int childrenCount = mChildrenCount; 1853 if (childrenCount != 0) { 1854 // Find a child that can receive the event. 1855 // Scan children from front to back. 1856 final View[] children = mChildren; 1857 final float x = ev.getX(actionIndex); 1858 final float y = ev.getY(actionIndex); 1859 1860 for (int i = childrenCount - 1; i >= 0; i--) { 1861 final View child = children[i]; 1862 if (!canViewReceivePointerEvents(child) 1863 || !isTransformedTouchPointInView(x, y, child, null)) { 1864 continue; 1865 } 1866 1867 newTouchTarget = getTouchTarget(child); 1868 if (newTouchTarget != null) { 1869 // Child is already receiving touch within its bounds. 1870 // Give it the new pointer in addition to the ones it is handling. 1871 newTouchTarget.pointerIdBits |= idBitsToAssign; 1872 break; 1873 } 1874 1875 resetCancelNextUpFlag(child); 1876 if (dispatchTransformedTouchEvent(ev, false, child, idBitsToAssign)) { 1877 // Child wants to receive touch within its bounds. 1878 mLastTouchDownTime = ev.getDownTime(); 1879 mLastTouchDownIndex = i; 1880 mLastTouchDownX = ev.getX(); 1881 mLastTouchDownY = ev.getY(); 1882 newTouchTarget = addTouchTarget(child, idBitsToAssign); 1883 alreadyDispatchedToNewTouchTarget = true; 1884 break; 1885 } 1886 } 1887 } 1888 1889 if (newTouchTarget == null && mFirstTouchTarget != null) { 1890 // Did not find a child to receive the event. 1891 // Assign the pointer to the least recently added target. 1892 newTouchTarget = mFirstTouchTarget; 1893 while (newTouchTarget.next != null) { 1894 newTouchTarget = newTouchTarget.next; 1895 } 1896 newTouchTarget.pointerIdBits |= idBitsToAssign; 1897 } 1898 } 1899 } 1900 1901 // Dispatch to touch targets. 1902 if (mFirstTouchTarget == null) { 1903 // No touch targets so treat this as an ordinary view. 1904 handled = dispatchTransformedTouchEvent(ev, canceled, null, 1905 TouchTarget.ALL_POINTER_IDS); 1906 } else { 1907 // Dispatch to touch targets, excluding the new touch target if we already 1908 // dispatched to it. Cancel touch targets if necessary. 1909 TouchTarget predecessor = null; 1910 TouchTarget target = mFirstTouchTarget; 1911 while (target != null) { 1912 final TouchTarget next = target.next; 1913 if (alreadyDispatchedToNewTouchTarget && target == newTouchTarget) { 1914 handled = true; 1915 } else { 1916 final boolean cancelChild = resetCancelNextUpFlag(target.child) 1917 || intercepted; 1918 if (dispatchTransformedTouchEvent(ev, cancelChild, 1919 target.child, target.pointerIdBits)) { 1920 handled = true; 1921 } 1922 if (cancelChild) { 1923 if (predecessor == null) { 1924 mFirstTouchTarget = next; 1925 } else { 1926 predecessor.next = next; 1927 } 1928 target.recycle(); 1929 target = next; 1930 continue; 1931 } 1932 } 1933 predecessor = target; 1934 target = next; 1935 } 1936 } 1937 1938 // Update list of touch targets for pointer up or cancel, if needed. 1939 if (canceled 1940 || actionMasked == MotionEvent.ACTION_UP 1941 || actionMasked == MotionEvent.ACTION_HOVER_MOVE) { 1942 resetTouchState(); 1943 } else if (split && actionMasked == MotionEvent.ACTION_POINTER_UP) { 1944 final int actionIndex = ev.getActionIndex(); 1945 final int idBitsToRemove = 1 << ev.getPointerId(actionIndex); 1946 removePointersFromTouchTargets(idBitsToRemove); 1947 } 1948 } 1949 1950 if (!handled && mInputEventConsistencyVerifier != null) { 1951 mInputEventConsistencyVerifier.onUnhandledEvent(ev, 1); 1952 } 1953 return handled; 1954 } 1955 1956 /** 1957 * Resets all touch state in preparation for a new cycle. 1958 */ 1959 private void resetTouchState() { 1960 clearTouchTargets(); 1961 resetCancelNextUpFlag(this); 1962 mGroupFlags &= ~FLAG_DISALLOW_INTERCEPT; 1963 } 1964 1965 /** 1966 * Resets the cancel next up flag. 1967 * Returns true if the flag was previously set. 1968 */ 1969 private static boolean resetCancelNextUpFlag(View view) { 1970 if ((view.mPrivateFlags & CANCEL_NEXT_UP_EVENT) != 0) { 1971 view.mPrivateFlags &= ~CANCEL_NEXT_UP_EVENT; 1972 return true; 1973 } 1974 return false; 1975 } 1976 1977 /** 1978 * Clears all touch targets. 1979 */ 1980 private void clearTouchTargets() { 1981 TouchTarget target = mFirstTouchTarget; 1982 if (target != null) { 1983 do { 1984 TouchTarget next = target.next; 1985 target.recycle(); 1986 target = next; 1987 } while (target != null); 1988 mFirstTouchTarget = null; 1989 } 1990 } 1991 1992 /** 1993 * Cancels and clears all touch targets. 1994 */ 1995 private void cancelAndClearTouchTargets(MotionEvent event) { 1996 if (mFirstTouchTarget != null) { 1997 boolean syntheticEvent = false; 1998 if (event == null) { 1999 final long now = SystemClock.uptimeMillis(); 2000 event = MotionEvent.obtain(now, now, 2001 MotionEvent.ACTION_CANCEL, 0.0f, 0.0f, 0); 2002 event.setSource(InputDevice.SOURCE_TOUCHSCREEN); 2003 syntheticEvent = true; 2004 } 2005 2006 for (TouchTarget target = mFirstTouchTarget; target != null; target = target.next) { 2007 resetCancelNextUpFlag(target.child); 2008 dispatchTransformedTouchEvent(event, true, target.child, target.pointerIdBits); 2009 } 2010 clearTouchTargets(); 2011 2012 if (syntheticEvent) { 2013 event.recycle(); 2014 } 2015 } 2016 } 2017 2018 /** 2019 * Gets the touch target for specified child view. 2020 * Returns null if not found. 2021 */ 2022 private TouchTarget getTouchTarget(View child) { 2023 for (TouchTarget target = mFirstTouchTarget; target != null; target = target.next) { 2024 if (target.child == child) { 2025 return target; 2026 } 2027 } 2028 return null; 2029 } 2030 2031 /** 2032 * Adds a touch target for specified child to the beginning of the list. 2033 * Assumes the target child is not already present. 2034 */ 2035 private TouchTarget addTouchTarget(View child, int pointerIdBits) { 2036 TouchTarget target = TouchTarget.obtain(child, pointerIdBits); 2037 target.next = mFirstTouchTarget; 2038 mFirstTouchTarget = target; 2039 return target; 2040 } 2041 2042 /** 2043 * Removes the pointer ids from consideration. 2044 */ 2045 private void removePointersFromTouchTargets(int pointerIdBits) { 2046 TouchTarget predecessor = null; 2047 TouchTarget target = mFirstTouchTarget; 2048 while (target != null) { 2049 final TouchTarget next = target.next; 2050 if ((target.pointerIdBits & pointerIdBits) != 0) { 2051 target.pointerIdBits &= ~pointerIdBits; 2052 if (target.pointerIdBits == 0) { 2053 if (predecessor == null) { 2054 mFirstTouchTarget = next; 2055 } else { 2056 predecessor.next = next; 2057 } 2058 target.recycle(); 2059 target = next; 2060 continue; 2061 } 2062 } 2063 predecessor = target; 2064 target = next; 2065 } 2066 } 2067 2068 private void cancelTouchTarget(View view) { 2069 TouchTarget predecessor = null; 2070 TouchTarget target = mFirstTouchTarget; 2071 while (target != null) { 2072 final TouchTarget next = target.next; 2073 if (target.child == view) { 2074 if (predecessor == null) { 2075 mFirstTouchTarget = next; 2076 } else { 2077 predecessor.next = next; 2078 } 2079 target.recycle(); 2080 2081 final long now = SystemClock.uptimeMillis(); 2082 MotionEvent event = MotionEvent.obtain(now, now, 2083 MotionEvent.ACTION_CANCEL, 0.0f, 0.0f, 0); 2084 event.setSource(InputDevice.SOURCE_TOUCHSCREEN); 2085 view.dispatchTouchEvent(event); 2086 event.recycle(); 2087 return; 2088 } 2089 predecessor = target; 2090 target = next; 2091 } 2092 } 2093 2094 /** 2095 * Returns true if a child view can receive pointer events. 2096 * @hide 2097 */ 2098 private static boolean canViewReceivePointerEvents(View child) { 2099 return (child.mViewFlags & VISIBILITY_MASK) == VISIBLE 2100 || child.getAnimation() != null; 2101 } 2102 2103 /** 2104 * Returns true if a child view contains the specified point when transformed 2105 * into its coordinate space. 2106 * Child must not be null. 2107 * @hide 2108 */ 2109 protected boolean isTransformedTouchPointInView(float x, float y, View child, 2110 PointF outLocalPoint) { 2111 float localX = x + mScrollX - child.mLeft; 2112 float localY = y + mScrollY - child.mTop; 2113 if (! child.hasIdentityMatrix() && mAttachInfo != null) { 2114 final float[] localXY = mAttachInfo.mTmpTransformLocation; 2115 localXY[0] = localX; 2116 localXY[1] = localY; 2117 child.getInverseMatrix().mapPoints(localXY); 2118 localX = localXY[0]; 2119 localY = localXY[1]; 2120 } 2121 final boolean isInView = child.pointInView(localX, localY); 2122 if (isInView && outLocalPoint != null) { 2123 outLocalPoint.set(localX, localY); 2124 } 2125 return isInView; 2126 } 2127 2128 /** 2129 * Transforms a motion event into the coordinate space of a particular child view, 2130 * filters out irrelevant pointer ids, and overrides its action if necessary. 2131 * If child is null, assumes the MotionEvent will be sent to this ViewGroup instead. 2132 */ 2133 private boolean dispatchTransformedTouchEvent(MotionEvent event, boolean cancel, 2134 View child, int desiredPointerIdBits) { 2135 final boolean handled; 2136 2137 // Canceling motions is a special case. We don't need to perform any transformations 2138 // or filtering. The important part is the action, not the contents. 2139 final int oldAction = event.getAction(); 2140 if (cancel || oldAction == MotionEvent.ACTION_CANCEL) { 2141 event.setAction(MotionEvent.ACTION_CANCEL); 2142 if (child == null) { 2143 handled = super.dispatchTouchEvent(event); 2144 } else { 2145 handled = child.dispatchTouchEvent(event); 2146 } 2147 event.setAction(oldAction); 2148 return handled; 2149 } 2150 2151 // Calculate the number of pointers to deliver. 2152 final int oldPointerIdBits = event.getPointerIdBits(); 2153 final int newPointerIdBits = oldPointerIdBits & desiredPointerIdBits; 2154 2155 // If for some reason we ended up in an inconsistent state where it looks like we 2156 // might produce a motion event with no pointers in it, then drop the event. 2157 if (newPointerIdBits == 0) { 2158 return false; 2159 } 2160 2161 // If the number of pointers is the same and we don't need to perform any fancy 2162 // irreversible transformations, then we can reuse the motion event for this 2163 // dispatch as long as we are careful to revert any changes we make. 2164 // Otherwise we need to make a copy. 2165 final MotionEvent transformedEvent; 2166 if (newPointerIdBits == oldPointerIdBits) { 2167 if (child == null || child.hasIdentityMatrix()) { 2168 if (child == null) { 2169 handled = super.dispatchTouchEvent(event); 2170 } else { 2171 final float offsetX = mScrollX - child.mLeft; 2172 final float offsetY = mScrollY - child.mTop; 2173 event.offsetLocation(offsetX, offsetY); 2174 2175 handled = child.dispatchTouchEvent(event); 2176 2177 event.offsetLocation(-offsetX, -offsetY); 2178 } 2179 return handled; 2180 } 2181 transformedEvent = MotionEvent.obtain(event); 2182 } else { 2183 transformedEvent = event.split(newPointerIdBits); 2184 } 2185 2186 // Perform any necessary transformations and dispatch. 2187 if (child == null) { 2188 handled = super.dispatchTouchEvent(transformedEvent); 2189 } else { 2190 final float offsetX = mScrollX - child.mLeft; 2191 final float offsetY = mScrollY - child.mTop; 2192 transformedEvent.offsetLocation(offsetX, offsetY); 2193 if (! child.hasIdentityMatrix()) { 2194 transformedEvent.transform(child.getInverseMatrix()); 2195 } 2196 2197 handled = child.dispatchTouchEvent(transformedEvent); 2198 } 2199 2200 // Done. 2201 transformedEvent.recycle(); 2202 return handled; 2203 } 2204 2205 /** 2206 * Enable or disable the splitting of MotionEvents to multiple children during touch event 2207 * dispatch. This behavior is enabled by default for applications that target an 2208 * SDK version of {@link Build.VERSION_CODES#HONEYCOMB} or newer. 2209 * 2210 * <p>When this option is enabled MotionEvents may be split and dispatched to different child 2211 * views depending on where each pointer initially went down. This allows for user interactions 2212 * such as scrolling two panes of content independently, chording of buttons, and performing 2213 * independent gestures on different pieces of content. 2214 * 2215 * @param split <code>true</code> to allow MotionEvents to be split and dispatched to multiple 2216 * child views. <code>false</code> to only allow one child view to be the target of 2217 * any MotionEvent received by this ViewGroup. 2218 */ 2219 public void setMotionEventSplittingEnabled(boolean split) { 2220 // TODO Applications really shouldn't change this setting mid-touch event, 2221 // but perhaps this should handle that case and send ACTION_CANCELs to any child views 2222 // with gestures in progress when this is changed. 2223 if (split) { 2224 mGroupFlags |= FLAG_SPLIT_MOTION_EVENTS; 2225 } else { 2226 mGroupFlags &= ~FLAG_SPLIT_MOTION_EVENTS; 2227 } 2228 } 2229 2230 /** 2231 * Returns true if MotionEvents dispatched to this ViewGroup can be split to multiple children. 2232 * @return true if MotionEvents dispatched to this ViewGroup can be split to multiple children. 2233 */ 2234 public boolean isMotionEventSplittingEnabled() { 2235 return (mGroupFlags & FLAG_SPLIT_MOTION_EVENTS) == FLAG_SPLIT_MOTION_EVENTS; 2236 } 2237 2238 /** 2239 * {@inheritDoc} 2240 */ 2241 public void requestDisallowInterceptTouchEvent(boolean disallowIntercept) { 2242 2243 if (disallowIntercept == ((mGroupFlags & FLAG_DISALLOW_INTERCEPT) != 0)) { 2244 // We're already in this state, assume our ancestors are too 2245 return; 2246 } 2247 2248 if (disallowIntercept) { 2249 mGroupFlags |= FLAG_DISALLOW_INTERCEPT; 2250 } else { 2251 mGroupFlags &= ~FLAG_DISALLOW_INTERCEPT; 2252 } 2253 2254 // Pass it up to our parent 2255 if (mParent != null) { 2256 mParent.requestDisallowInterceptTouchEvent(disallowIntercept); 2257 } 2258 } 2259 2260 /** 2261 * Implement this method to intercept all touch screen motion events. This 2262 * allows you to watch events as they are dispatched to your children, and 2263 * take ownership of the current gesture at any point. 2264 * 2265 * <p>Using this function takes some care, as it has a fairly complicated 2266 * interaction with {@link View#onTouchEvent(MotionEvent) 2267 * View.onTouchEvent(MotionEvent)}, and using it requires implementing 2268 * that method as well as this one in the correct way. Events will be 2269 * received in the following order: 2270 * 2271 * <ol> 2272 * <li> You will receive the down event here. 2273 * <li> The down event will be handled either by a child of this view 2274 * group, or given to your own onTouchEvent() method to handle; this means 2275 * you should implement onTouchEvent() to return true, so you will 2276 * continue to see the rest of the gesture (instead of looking for 2277 * a parent view to handle it). Also, by returning true from 2278 * onTouchEvent(), you will not receive any following 2279 * events in onInterceptTouchEvent() and all touch processing must 2280 * happen in onTouchEvent() like normal. 2281 * <li> For as long as you return false from this function, each following 2282 * event (up to and including the final up) will be delivered first here 2283 * and then to the target's onTouchEvent(). 2284 * <li> If you return true from here, you will not receive any 2285 * following events: the target view will receive the same event but 2286 * with the action {@link MotionEvent#ACTION_CANCEL}, and all further 2287 * events will be delivered to your onTouchEvent() method and no longer 2288 * appear here. 2289 * </ol> 2290 * 2291 * @param ev The motion event being dispatched down the hierarchy. 2292 * @return Return true to steal motion events from the children and have 2293 * them dispatched to this ViewGroup through onTouchEvent(). 2294 * The current target will receive an ACTION_CANCEL event, and no further 2295 * messages will be delivered here. 2296 */ 2297 public boolean onInterceptTouchEvent(MotionEvent ev) { 2298 return false; 2299 } 2300 2301 /** 2302 * {@inheritDoc} 2303 * 2304 * Looks for a view to give focus to respecting the setting specified by 2305 * {@link #getDescendantFocusability()}. 2306 * 2307 * Uses {@link #onRequestFocusInDescendants(int, android.graphics.Rect)} to 2308 * find focus within the children of this group when appropriate. 2309 * 2310 * @see #FOCUS_BEFORE_DESCENDANTS 2311 * @see #FOCUS_AFTER_DESCENDANTS 2312 * @see #FOCUS_BLOCK_DESCENDANTS 2313 * @see #onRequestFocusInDescendants(int, android.graphics.Rect) 2314 */ 2315 @Override 2316 public boolean requestFocus(int direction, Rect previouslyFocusedRect) { 2317 if (DBG) { 2318 System.out.println(this + " ViewGroup.requestFocus direction=" 2319 + direction); 2320 } 2321 int descendantFocusability = getDescendantFocusability(); 2322 2323 switch (descendantFocusability) { 2324 case FOCUS_BLOCK_DESCENDANTS: 2325 return super.requestFocus(direction, previouslyFocusedRect); 2326 case FOCUS_BEFORE_DESCENDANTS: { 2327 final boolean took = super.requestFocus(direction, previouslyFocusedRect); 2328 return took ? took : onRequestFocusInDescendants(direction, previouslyFocusedRect); 2329 } 2330 case FOCUS_AFTER_DESCENDANTS: { 2331 final boolean took = onRequestFocusInDescendants(direction, previouslyFocusedRect); 2332 return took ? took : super.requestFocus(direction, previouslyFocusedRect); 2333 } 2334 default: 2335 throw new IllegalStateException("descendant focusability must be " 2336 + "one of FOCUS_BEFORE_DESCENDANTS, FOCUS_AFTER_DESCENDANTS, FOCUS_BLOCK_DESCENDANTS " 2337 + "but is " + descendantFocusability); 2338 } 2339 } 2340 2341 /** 2342 * Look for a descendant to call {@link View#requestFocus} on. 2343 * Called by {@link ViewGroup#requestFocus(int, android.graphics.Rect)} 2344 * when it wants to request focus within its children. Override this to 2345 * customize how your {@link ViewGroup} requests focus within its children. 2346 * @param direction One of FOCUS_UP, FOCUS_DOWN, FOCUS_LEFT, and FOCUS_RIGHT 2347 * @param previouslyFocusedRect The rectangle (in this View's coordinate system) 2348 * to give a finer grained hint about where focus is coming from. May be null 2349 * if there is no hint. 2350 * @return Whether focus was taken. 2351 */ 2352 @SuppressWarnings({"ConstantConditions"}) 2353 protected boolean onRequestFocusInDescendants(int direction, 2354 Rect previouslyFocusedRect) { 2355 int index; 2356 int increment; 2357 int end; 2358 int count = mChildrenCount; 2359 if ((direction & FOCUS_FORWARD) != 0) { 2360 index = 0; 2361 increment = 1; 2362 end = count; 2363 } else { 2364 index = count - 1; 2365 increment = -1; 2366 end = -1; 2367 } 2368 final View[] children = mChildren; 2369 for (int i = index; i != end; i += increment) { 2370 View child = children[i]; 2371 if ((child.mViewFlags & VISIBILITY_MASK) == VISIBLE) { 2372 if (child.requestFocus(direction, previouslyFocusedRect)) { 2373 return true; 2374 } 2375 } 2376 } 2377 return false; 2378 } 2379 2380 /** 2381 * {@inheritDoc} 2382 * 2383 * @hide 2384 */ 2385 @Override 2386 public void dispatchStartTemporaryDetach() { 2387 super.dispatchStartTemporaryDetach(); 2388 final int count = mChildrenCount; 2389 final View[] children = mChildren; 2390 for (int i = 0; i < count; i++) { 2391 children[i].dispatchStartTemporaryDetach(); 2392 } 2393 } 2394 2395 /** 2396 * {@inheritDoc} 2397 * 2398 * @hide 2399 */ 2400 @Override 2401 public void dispatchFinishTemporaryDetach() { 2402 super.dispatchFinishTemporaryDetach(); 2403 final int count = mChildrenCount; 2404 final View[] children = mChildren; 2405 for (int i = 0; i < count; i++) { 2406 children[i].dispatchFinishTemporaryDetach(); 2407 } 2408 } 2409 2410 /** 2411 * {@inheritDoc} 2412 */ 2413 @Override 2414 void dispatchAttachedToWindow(AttachInfo info, int visibility) { 2415 mGroupFlags |= FLAG_PREVENT_DISPATCH_ATTACHED_TO_WINDOW; 2416 super.dispatchAttachedToWindow(info, visibility); 2417 mGroupFlags &= ~FLAG_PREVENT_DISPATCH_ATTACHED_TO_WINDOW; 2418 2419 final int count = mChildrenCount; 2420 final View[] children = mChildren; 2421 for (int i = 0; i < count; i++) { 2422 final View child = children[i]; 2423 child.dispatchAttachedToWindow(info, 2424 visibility | (child.mViewFlags&VISIBILITY_MASK)); 2425 } 2426 } 2427 2428 @Override 2429 void dispatchScreenStateChanged(int screenState) { 2430 super.dispatchScreenStateChanged(screenState); 2431 2432 final int count = mChildrenCount; 2433 final View[] children = mChildren; 2434 for (int i = 0; i < count; i++) { 2435 children[i].dispatchScreenStateChanged(screenState); 2436 } 2437 } 2438 2439 @Override 2440 boolean dispatchPopulateAccessibilityEventInternal(AccessibilityEvent event) { 2441 boolean handled = false; 2442 if (includeForAccessibility()) { 2443 handled = super.dispatchPopulateAccessibilityEventInternal(event); 2444 if (handled) { 2445 return handled; 2446 } 2447 } 2448 // Let our children have a shot in populating the event. 2449 ChildListForAccessibility children = ChildListForAccessibility.obtain(this, true); 2450 try { 2451 final int childCount = children.getChildCount(); 2452 for (int i = 0; i < childCount; i++) { 2453 View child = children.getChildAt(i); 2454 if ((child.mViewFlags & VISIBILITY_MASK) == VISIBLE) { 2455 handled = child.dispatchPopulateAccessibilityEvent(event); 2456 if (handled) { 2457 return handled; 2458 } 2459 } 2460 } 2461 } finally { 2462 children.recycle(); 2463 } 2464 return false; 2465 } 2466 2467 @Override 2468 void onInitializeAccessibilityNodeInfoInternal(AccessibilityNodeInfo info) { 2469 super.onInitializeAccessibilityNodeInfoInternal(info); 2470 if (mAttachInfo != null) { 2471 ArrayList<View> childrenForAccessibility = mAttachInfo.mTempArrayList; 2472 childrenForAccessibility.clear(); 2473 addChildrenForAccessibility(childrenForAccessibility); 2474 final int childrenForAccessibilityCount = childrenForAccessibility.size(); 2475 for (int i = 0; i < childrenForAccessibilityCount; i++) { 2476 View child = childrenForAccessibility.get(i); 2477 info.addChild(child); 2478 } 2479 childrenForAccessibility.clear(); 2480 } 2481 } 2482 2483 @Override 2484 void onInitializeAccessibilityEventInternal(AccessibilityEvent event) { 2485 super.onInitializeAccessibilityEventInternal(event); 2486 event.setClassName(ViewGroup.class.getName()); 2487 } 2488 2489 /** 2490 * @hide 2491 */ 2492 @Override 2493 public void resetAccessibilityStateChanged() { 2494 super.resetAccessibilityStateChanged(); 2495 View[] children = mChildren; 2496 final int childCount = mChildrenCount; 2497 for (int i = 0; i < childCount; i++) { 2498 View child = children[i]; 2499 child.resetAccessibilityStateChanged(); 2500 } 2501 } 2502 2503 /** 2504 * {@inheritDoc} 2505 */ 2506 @Override 2507 void dispatchDetachedFromWindow() { 2508 // If we still have a touch target, we are still in the process of 2509 // dispatching motion events to a child; we need to get rid of that 2510 // child to avoid dispatching events to it after the window is torn 2511 // down. To make sure we keep the child in a consistent state, we 2512 // first send it an ACTION_CANCEL motion event. 2513 cancelAndClearTouchTargets(null); 2514 2515 // Similarly, set ACTION_EXIT to all hover targets and clear them. 2516 exitHoverTargets(); 2517 2518 // In case view is detached while transition is running 2519 mLayoutSuppressed = false; 2520 2521 // Tear down our drag tracking 2522 mDragNotifiedChildren = null; 2523 if (mCurrentDrag != null) { 2524 mCurrentDrag.recycle(); 2525 mCurrentDrag = null; 2526 } 2527 2528 final int count = mChildrenCount; 2529 final View[] children = mChildren; 2530 for (int i = 0; i < count; i++) { 2531 children[i].dispatchDetachedFromWindow(); 2532 } 2533 super.dispatchDetachedFromWindow(); 2534 } 2535 2536 /** 2537 * {@inheritDoc} 2538 */ 2539 @Override 2540 public void setPadding(int left, int top, int right, int bottom) { 2541 super.setPadding(left, top, right, bottom); 2542 2543 if ((mPaddingLeft | mPaddingTop | mPaddingRight | mPaddingBottom) != 0) { 2544 mGroupFlags |= FLAG_PADDING_NOT_NULL; 2545 } else { 2546 mGroupFlags &= ~FLAG_PADDING_NOT_NULL; 2547 } 2548 } 2549 2550 /** 2551 * {@inheritDoc} 2552 */ 2553 @Override 2554 protected void dispatchSaveInstanceState(SparseArray<Parcelable> container) { 2555 super.dispatchSaveInstanceState(container); 2556 final int count = mChildrenCount; 2557 final View[] children = mChildren; 2558 for (int i = 0; i < count; i++) { 2559 View c = children[i]; 2560 if ((c.mViewFlags & PARENT_SAVE_DISABLED_MASK) != PARENT_SAVE_DISABLED) { 2561 c.dispatchSaveInstanceState(container); 2562 } 2563 } 2564 } 2565 2566 /** 2567 * Perform dispatching of a {@link #saveHierarchyState(android.util.SparseArray)} freeze()} 2568 * to only this view, not to its children. For use when overriding 2569 * {@link #dispatchSaveInstanceState(android.util.SparseArray)} dispatchFreeze()} to allow 2570 * subclasses to freeze their own state but not the state of their children. 2571 * 2572 * @param container the container 2573 */ 2574 protected void dispatchFreezeSelfOnly(SparseArray<Parcelable> container) { 2575 super.dispatchSaveInstanceState(container); 2576 } 2577 2578 /** 2579 * {@inheritDoc} 2580 */ 2581 @Override 2582 protected void dispatchRestoreInstanceState(SparseArray<Parcelable> container) { 2583 super.dispatchRestoreInstanceState(container); 2584 final int count = mChildrenCount; 2585 final View[] children = mChildren; 2586 for (int i = 0; i < count; i++) { 2587 View c = children[i]; 2588 if ((c.mViewFlags & PARENT_SAVE_DISABLED_MASK) != PARENT_SAVE_DISABLED) { 2589 c.dispatchRestoreInstanceState(container); 2590 } 2591 } 2592 } 2593 2594 /** 2595 * Perform dispatching of a {@link #restoreHierarchyState(android.util.SparseArray)} 2596 * to only this view, not to its children. For use when overriding 2597 * {@link #dispatchRestoreInstanceState(android.util.SparseArray)} to allow 2598 * subclasses to thaw their own state but not the state of their children. 2599 * 2600 * @param container the container 2601 */ 2602 protected void dispatchThawSelfOnly(SparseArray<Parcelable> container) { 2603 super.dispatchRestoreInstanceState(container); 2604 } 2605 2606 /** 2607 * Enables or disables the drawing cache for each child of this view group. 2608 * 2609 * @param enabled true to enable the cache, false to dispose of it 2610 */ 2611 protected void setChildrenDrawingCacheEnabled(boolean enabled) { 2612 if (enabled || (mPersistentDrawingCache & PERSISTENT_ALL_CACHES) != PERSISTENT_ALL_CACHES) { 2613 final View[] children = mChildren; 2614 final int count = mChildrenCount; 2615 for (int i = 0; i < count; i++) { 2616 children[i].setDrawingCacheEnabled(enabled); 2617 } 2618 } 2619 } 2620 2621 @Override 2622 protected void onAnimationStart() { 2623 super.onAnimationStart(); 2624 2625 // When this ViewGroup's animation starts, build the cache for the children 2626 if ((mGroupFlags & FLAG_ANIMATION_CACHE) == FLAG_ANIMATION_CACHE) { 2627 final int count = mChildrenCount; 2628 final View[] children = mChildren; 2629 final boolean buildCache = !isHardwareAccelerated(); 2630 2631 for (int i = 0; i < count; i++) { 2632 final View child = children[i]; 2633 if ((child.mViewFlags & VISIBILITY_MASK) == VISIBLE) { 2634 child.setDrawingCacheEnabled(true); 2635 if (buildCache) { 2636 child.buildDrawingCache(true); 2637 } 2638 } 2639 } 2640 2641 mGroupFlags |= FLAG_CHILDREN_DRAWN_WITH_CACHE; 2642 } 2643 } 2644 2645 @Override 2646 protected void onAnimationEnd() { 2647 super.onAnimationEnd(); 2648 2649 // When this ViewGroup's animation ends, destroy the cache of the children 2650 if ((mGroupFlags & FLAG_ANIMATION_CACHE) == FLAG_ANIMATION_CACHE) { 2651 mGroupFlags &= ~FLAG_CHILDREN_DRAWN_WITH_CACHE; 2652 2653 if ((mPersistentDrawingCache & PERSISTENT_ANIMATION_CACHE) == 0) { 2654 setChildrenDrawingCacheEnabled(false); 2655 } 2656 } 2657 } 2658 2659 @Override 2660 Bitmap createSnapshot(Bitmap.Config quality, int backgroundColor, boolean skipChildren) { 2661 int count = mChildrenCount; 2662 int[] visibilities = null; 2663 2664 if (skipChildren) { 2665 visibilities = new int[count]; 2666 for (int i = 0; i < count; i++) { 2667 View child = getChildAt(i); 2668 visibilities[i] = child.getVisibility(); 2669 if (visibilities[i] == View.VISIBLE) { 2670 child.setVisibility(INVISIBLE); 2671 } 2672 } 2673 } 2674 2675 Bitmap b = super.createSnapshot(quality, backgroundColor, skipChildren); 2676 2677 if (skipChildren) { 2678 for (int i = 0; i < count; i++) { 2679 getChildAt(i).setVisibility(visibilities[i]); 2680 } 2681 } 2682 2683 return b; 2684 } 2685 2686 private static void drawRect(Canvas canvas, int x1, int y1, int x2, int y2, int color) { 2687 Paint paint = getDebugPaint(); 2688 paint.setColor(color); 2689 2690 canvas.drawLines(getDebugLines(x1, y1, x2, y2), paint); 2691 } 2692 2693 /** 2694 * @hide 2695 */ 2696 protected void onDebugDrawMargins(Canvas canvas) { 2697 for (int i = 0; i < getChildCount(); i++) { 2698 View c = getChildAt(i); 2699 c.getLayoutParams().onDebugDraw(c, canvas); 2700 } 2701 } 2702 2703 /** 2704 * @hide 2705 */ 2706 protected void onDebugDraw(Canvas canvas) { 2707 // Draw optical bounds 2708 if (getLayoutMode() == OPTICAL_BOUNDS) { 2709 for (int i = 0; i < getChildCount(); i++) { 2710 View c = getChildAt(i); 2711 Insets insets = c.getOpticalInsets(); 2712 drawRect(canvas, 2713 c.getLeft() + insets.left, 2714 c.getTop() + insets.top, 2715 c.getRight() - insets.right, 2716 c.getBottom() - insets.bottom, Color.RED); 2717 } 2718 } 2719 2720 // Draw margins 2721 onDebugDrawMargins(canvas); 2722 2723 // Draw bounds 2724 for (int i = 0; i < getChildCount(); i++) { 2725 View c = getChildAt(i); 2726 drawRect(canvas, c.getLeft(), c.getTop(), c.getRight(), c.getBottom(), Color.BLUE); 2727 } 2728 } 2729 2730 /** 2731 * {@inheritDoc} 2732 */ 2733 @Override 2734 protected void dispatchDraw(Canvas canvas) { 2735 final int count = mChildrenCount; 2736 final View[] children = mChildren; 2737 int flags = mGroupFlags; 2738 2739 if ((flags & FLAG_RUN_ANIMATION) != 0 && canAnimate()) { 2740 final boolean cache = (mGroupFlags & FLAG_ANIMATION_CACHE) == FLAG_ANIMATION_CACHE; 2741 2742 final boolean buildCache = !isHardwareAccelerated(); 2743 for (int i = 0; i < count; i++) { 2744 final View child = children[i]; 2745 if ((child.mViewFlags & VISIBILITY_MASK) == VISIBLE) { 2746 final LayoutParams params = child.getLayoutParams(); 2747 attachLayoutAnimationParameters(child, params, i, count); 2748 bindLayoutAnimation(child); 2749 if (cache) { 2750 child.setDrawingCacheEnabled(true); 2751 if (buildCache) { 2752 child.buildDrawingCache(true); 2753 } 2754 } 2755 } 2756 } 2757 2758 final LayoutAnimationController controller = mLayoutAnimationController; 2759 if (controller.willOverlap()) { 2760 mGroupFlags |= FLAG_OPTIMIZE_INVALIDATE; 2761 } 2762 2763 controller.start(); 2764 2765 mGroupFlags &= ~FLAG_RUN_ANIMATION; 2766 mGroupFlags &= ~FLAG_ANIMATION_DONE; 2767 2768 if (cache) { 2769 mGroupFlags |= FLAG_CHILDREN_DRAWN_WITH_CACHE; 2770 } 2771 2772 if (mAnimationListener != null) { 2773 mAnimationListener.onAnimationStart(controller.getAnimation()); 2774 } 2775 } 2776 2777 int saveCount = 0; 2778 final boolean clipToPadding = (flags & CLIP_TO_PADDING_MASK) == CLIP_TO_PADDING_MASK; 2779 if (clipToPadding) { 2780 saveCount = canvas.save(); 2781 canvas.clipRect(mScrollX + mPaddingLeft, mScrollY + mPaddingTop, 2782 mScrollX + mRight - mLeft - mPaddingRight, 2783 mScrollY + mBottom - mTop - mPaddingBottom); 2784 2785 } 2786 2787 // We will draw our child's animation, let's reset the flag 2788 mPrivateFlags &= ~DRAW_ANIMATION; 2789 mGroupFlags &= ~FLAG_INVALIDATE_REQUIRED; 2790 2791 boolean more = false; 2792 final long drawingTime = getDrawingTime(); 2793 2794 if ((flags & FLAG_USE_CHILD_DRAWING_ORDER) == 0) { 2795 for (int i = 0; i < count; i++) { 2796 final View child = children[i]; 2797 if ((child.mViewFlags & VISIBILITY_MASK) == VISIBLE || child.getAnimation() != null) { 2798 more |= drawChild(canvas, child, drawingTime); 2799 } 2800 } 2801 } else { 2802 for (int i = 0; i < count; i++) { 2803 final View child = children[getChildDrawingOrder(count, i)]; 2804 if ((child.mViewFlags & VISIBILITY_MASK) == VISIBLE || child.getAnimation() != null) { 2805 more |= drawChild(canvas, child, drawingTime); 2806 } 2807 } 2808 } 2809 2810 // Draw any disappearing views that have animations 2811 if (mDisappearingChildren != null) { 2812 final ArrayList<View> disappearingChildren = mDisappearingChildren; 2813 final int disappearingCount = disappearingChildren.size() - 1; 2814 // Go backwards -- we may delete as animations finish 2815 for (int i = disappearingCount; i >= 0; i--) { 2816 final View child = disappearingChildren.get(i); 2817 more |= drawChild(canvas, child, drawingTime); 2818 } 2819 } 2820 2821 if (debugDraw()) { 2822 onDebugDraw(canvas); 2823 } 2824 2825 if (clipToPadding) { 2826 canvas.restoreToCount(saveCount); 2827 } 2828 2829 // mGroupFlags might have been updated by drawChild() 2830 flags = mGroupFlags; 2831 2832 if ((flags & FLAG_INVALIDATE_REQUIRED) == FLAG_INVALIDATE_REQUIRED) { 2833 invalidate(true); 2834 } 2835 2836 if ((flags & FLAG_ANIMATION_DONE) == 0 && (flags & FLAG_NOTIFY_ANIMATION_LISTENER) == 0 && 2837 mLayoutAnimationController.isDone() && !more) { 2838 // We want to erase the drawing cache and notify the listener after the 2839 // next frame is drawn because one extra invalidate() is caused by 2840 // drawChild() after the animation is over 2841 mGroupFlags |= FLAG_NOTIFY_ANIMATION_LISTENER; 2842 final Runnable end = new Runnable() { 2843 public void run() { 2844 notifyAnimationListener(); 2845 } 2846 }; 2847 post(end); 2848 } 2849 } 2850 2851 /** 2852 * Returns the index of the child to draw for this iteration. Override this 2853 * if you want to change the drawing order of children. By default, it 2854 * returns i. 2855 * <p> 2856 * NOTE: In order for this method to be called, you must enable child ordering 2857 * first by calling {@link #setChildrenDrawingOrderEnabled(boolean)}. 2858 * 2859 * @param i The current iteration. 2860 * @return The index of the child to draw this iteration. 2861 * 2862 * @see #setChildrenDrawingOrderEnabled(boolean) 2863 * @see #isChildrenDrawingOrderEnabled() 2864 */ 2865 protected int getChildDrawingOrder(int childCount, int i) { 2866 return i; 2867 } 2868 2869 private void notifyAnimationListener() { 2870 mGroupFlags &= ~FLAG_NOTIFY_ANIMATION_LISTENER; 2871 mGroupFlags |= FLAG_ANIMATION_DONE; 2872 2873 if (mAnimationListener != null) { 2874 final Runnable end = new Runnable() { 2875 public void run() { 2876 mAnimationListener.onAnimationEnd(mLayoutAnimationController.getAnimation()); 2877 } 2878 }; 2879 post(end); 2880 } 2881 2882 if ((mGroupFlags & FLAG_ANIMATION_CACHE) == FLAG_ANIMATION_CACHE) { 2883 mGroupFlags &= ~FLAG_CHILDREN_DRAWN_WITH_CACHE; 2884 if ((mPersistentDrawingCache & PERSISTENT_ANIMATION_CACHE) == 0) { 2885 setChildrenDrawingCacheEnabled(false); 2886 } 2887 } 2888 2889 invalidate(true); 2890 } 2891 2892 /** 2893 * This method is used to cause children of this ViewGroup to restore or recreate their 2894 * display lists. It is called by getDisplayList() when the parent ViewGroup does not need 2895 * to recreate its own display list, which would happen if it went through the normal 2896 * draw/dispatchDraw mechanisms. 2897 * 2898 * @hide 2899 */ 2900 @Override 2901 protected void dispatchGetDisplayList() { 2902 final int count = mChildrenCount; 2903 final View[] children = mChildren; 2904 for (int i = 0; i < count; i++) { 2905 final View child = children[i]; 2906 if (((child.mViewFlags & VISIBILITY_MASK) == VISIBLE || child.getAnimation() != null) && 2907 child.hasStaticLayer()) { 2908 child.mRecreateDisplayList = (child.mPrivateFlags & INVALIDATED) == INVALIDATED; 2909 child.mPrivateFlags &= ~INVALIDATED; 2910 child.getDisplayList(); 2911 child.mRecreateDisplayList = false; 2912 } 2913 } 2914 } 2915 2916 /** 2917 * Draw one child of this View Group. This method is responsible for getting 2918 * the canvas in the right state. This includes clipping, translating so 2919 * that the child's scrolled origin is at 0, 0, and applying any animation 2920 * transformations. 2921 * 2922 * @param canvas The canvas on which to draw the child 2923 * @param child Who to draw 2924 * @param drawingTime The time at which draw is occurring 2925 * @return True if an invalidate() was issued 2926 */ 2927 protected boolean drawChild(Canvas canvas, View child, long drawingTime) { 2928 return child.draw(canvas, this, drawingTime); 2929 } 2930 2931 /** 2932 * 2933 * @param enabled True if children should be drawn with layers, false otherwise. 2934 * 2935 * @hide 2936 */ 2937 public void setChildrenLayersEnabled(boolean enabled) { 2938 if (enabled != mDrawLayers) { 2939 mDrawLayers = enabled; 2940 invalidate(true); 2941 2942 boolean flushLayers = !enabled; 2943 AttachInfo info = mAttachInfo; 2944 if (info != null && info.mHardwareRenderer != null && 2945 info.mHardwareRenderer.isEnabled()) { 2946 if (!info.mHardwareRenderer.validate()) { 2947 flushLayers = false; 2948 } 2949 } else { 2950 flushLayers = false; 2951 } 2952 2953 // We need to invalidate any child with a layer. For instance, 2954 // if a child is backed by a hardware layer and we disable layers 2955 // the child is marked as not dirty (flags cleared the last time 2956 // the child was drawn inside its layer.) However, that child might 2957 // never have created its own display list or have an obsolete 2958 // display list. By invalidating the child we ensure the display 2959 // list is in sync with the content of the hardware layer. 2960 for (int i = 0; i < mChildrenCount; i++) { 2961 View child = mChildren[i]; 2962 if (child.mLayerType != LAYER_TYPE_NONE) { 2963 if (flushLayers) child.flushLayer(); 2964 child.invalidate(true); 2965 } 2966 } 2967 } 2968 } 2969 2970 /** 2971 * By default, children are clipped to their bounds before drawing. This 2972 * allows view groups to override this behavior for animations, etc. 2973 * 2974 * @param clipChildren true to clip children to their bounds, 2975 * false otherwise 2976 * @attr ref android.R.styleable#ViewGroup_clipChildren 2977 */ 2978 public void setClipChildren(boolean clipChildren) { 2979 boolean previousValue = (mGroupFlags & FLAG_CLIP_CHILDREN) == FLAG_CLIP_CHILDREN; 2980 if (clipChildren != previousValue) { 2981 setBooleanFlag(FLAG_CLIP_CHILDREN, clipChildren); 2982 for (int i = 0; i < mChildrenCount; ++i) { 2983 View child = getChildAt(i); 2984 if (child.mDisplayList != null) { 2985 child.mDisplayList.setClipChildren(clipChildren); 2986 } 2987 } 2988 } 2989 } 2990 2991 /** 2992 * By default, children are clipped to the padding of the ViewGroup. This 2993 * allows view groups to override this behavior 2994 * 2995 * @param clipToPadding true to clip children to the padding of the 2996 * group, false otherwise 2997 * @attr ref android.R.styleable#ViewGroup_clipToPadding 2998 */ 2999 public void setClipToPadding(boolean clipToPadding) { 3000 setBooleanFlag(FLAG_CLIP_TO_PADDING, clipToPadding); 3001 } 3002 3003 /** 3004 * {@inheritDoc} 3005 */ 3006 @Override 3007 public void dispatchSetSelected(boolean selected) { 3008 final View[] children = mChildren; 3009 final int count = mChildrenCount; 3010 for (int i = 0; i < count; i++) { 3011 children[i].setSelected(selected); 3012 } 3013 } 3014 3015 /** 3016 * {@inheritDoc} 3017 */ 3018 @Override 3019 public void dispatchSetActivated(boolean activated) { 3020 final View[] children = mChildren; 3021 final int count = mChildrenCount; 3022 for (int i = 0; i < count; i++) { 3023 children[i].setActivated(activated); 3024 } 3025 } 3026 3027 @Override 3028 protected void dispatchSetPressed(boolean pressed) { 3029 final View[] children = mChildren; 3030 final int count = mChildrenCount; 3031 for (int i = 0; i < count; i++) { 3032 final View child = children[i]; 3033 // Children that are clickable on their own should not 3034 // show a pressed state when their parent view does. 3035 // Clearing a pressed state always propagates. 3036 if (!pressed || (!child.isClickable() && !child.isLongClickable())) { 3037 child.setPressed(pressed); 3038 } 3039 } 3040 } 3041 3042 /** 3043 * When this property is set to true, this ViewGroup supports static transformations on 3044 * children; this causes 3045 * {@link #getChildStaticTransformation(View, android.view.animation.Transformation)} to be 3046 * invoked when a child is drawn. 3047 * 3048 * Any subclass overriding 3049 * {@link #getChildStaticTransformation(View, android.view.animation.Transformation)} should 3050 * set this property to true. 3051 * 3052 * @param enabled True to enable static transformations on children, false otherwise. 3053 * 3054 * @see #FLAG_SUPPORT_STATIC_TRANSFORMATIONS 3055 */ 3056 protected void setStaticTransformationsEnabled(boolean enabled) { 3057 setBooleanFlag(FLAG_SUPPORT_STATIC_TRANSFORMATIONS, enabled); 3058 } 3059 3060 /** 3061 * Sets <code>t</code> to be the static transformation of the child, if set, returning a 3062 * boolean to indicate whether a static transform was set. The default implementation 3063 * simply returns <code>false</code>; subclasses may override this method for different 3064 * behavior. 3065 * 3066 * @param child The child view whose static transform is being requested 3067 * @param t The Transformation which will hold the result 3068 * @return true if the transformation was set, false otherwise 3069 * @see #setStaticTransformationsEnabled(boolean) 3070 */ 3071 protected boolean getChildStaticTransformation(View child, Transformation t) { 3072 return false; 3073 } 3074 3075 /** 3076 * {@hide} 3077 */ 3078 @Override 3079 protected View findViewTraversal(int id) { 3080 if (id == mID) { 3081 return this; 3082 } 3083 3084 final View[] where = mChildren; 3085 final int len = mChildrenCount; 3086 3087 for (int i = 0; i < len; i++) { 3088 View v = where[i]; 3089 3090 if ((v.mPrivateFlags & IS_ROOT_NAMESPACE) == 0) { 3091 v = v.findViewById(id); 3092 3093 if (v != null) { 3094 return v; 3095 } 3096 } 3097 } 3098 3099 return null; 3100 } 3101 3102 /** 3103 * {@hide} 3104 */ 3105 @Override 3106 protected View findViewWithTagTraversal(Object tag) { 3107 if (tag != null && tag.equals(mTag)) { 3108 return this; 3109 } 3110 3111 final View[] where = mChildren; 3112 final int len = mChildrenCount; 3113 3114 for (int i = 0; i < len; i++) { 3115 View v = where[i]; 3116 3117 if ((v.mPrivateFlags & IS_ROOT_NAMESPACE) == 0) { 3118 v = v.findViewWithTag(tag); 3119 3120 if (v != null) { 3121 return v; 3122 } 3123 } 3124 } 3125 3126 return null; 3127 } 3128 3129 /** 3130 * {@hide} 3131 */ 3132 @Override 3133 protected View findViewByPredicateTraversal(Predicate<View> predicate, View childToSkip) { 3134 if (predicate.apply(this)) { 3135 return this; 3136 } 3137 3138 final View[] where = mChildren; 3139 final int len = mChildrenCount; 3140 3141 for (int i = 0; i < len; i++) { 3142 View v = where[i]; 3143 3144 if (v != childToSkip && (v.mPrivateFlags & IS_ROOT_NAMESPACE) == 0) { 3145 v = v.findViewByPredicate(predicate); 3146 3147 if (v != null) { 3148 return v; 3149 } 3150 } 3151 } 3152 3153 return null; 3154 } 3155 3156 /** 3157 * <p>Adds a child view. If no layout parameters are already set on the child, the 3158 * default parameters for this ViewGroup are set on the child.</p> 3159 * 3160 * <p><strong>Note:</strong> do not invoke this method from 3161 * {@link #draw(android.graphics.Canvas)}, {@link #onDraw(android.graphics.Canvas)}, 3162 * {@link #dispatchDraw(android.graphics.Canvas)} or any related method.</p> 3163 * 3164 * @param child the child view to add 3165 * 3166 * @see #generateDefaultLayoutParams() 3167 */ 3168 public void addView(View child) { 3169 addView(child, -1); 3170 } 3171 3172 /** 3173 * Adds a child view. If no layout parameters are already set on the child, the 3174 * default parameters for this ViewGroup are set on the child. 3175 * 3176 * <p><strong>Note:</strong> do not invoke this method from 3177 * {@link #draw(android.graphics.Canvas)}, {@link #onDraw(android.graphics.Canvas)}, 3178 * {@link #dispatchDraw(android.graphics.Canvas)} or any related method.</p> 3179 * 3180 * @param child the child view to add 3181 * @param index the position at which to add the child 3182 * 3183 * @see #generateDefaultLayoutParams() 3184 */ 3185 public void addView(View child, int index) { 3186 LayoutParams params = child.getLayoutParams(); 3187 if (params == null) { 3188 params = generateDefaultLayoutParams(); 3189 if (params == null) { 3190 throw new IllegalArgumentException("generateDefaultLayoutParams() cannot return null"); 3191 } 3192 } 3193 addView(child, index, params); 3194 } 3195 3196 /** 3197 * Adds a child view with this ViewGroup's default layout parameters and the 3198 * specified width and height. 3199 * 3200 * <p><strong>Note:</strong> do not invoke this method from 3201 * {@link #draw(android.graphics.Canvas)}, {@link #onDraw(android.graphics.Canvas)}, 3202 * {@link #dispatchDraw(android.graphics.Canvas)} or any related method.</p> 3203 * 3204 * @param child the child view to add 3205 */ 3206 public void addView(View child, int width, int height) { 3207 final LayoutParams params = generateDefaultLayoutParams(); 3208 params.width = width; 3209 params.height = height; 3210 addView(child, -1, params); 3211 } 3212 3213 /** 3214 * Adds a child view with the specified layout parameters. 3215 * 3216 * <p><strong>Note:</strong> do not invoke this method from 3217 * {@link #draw(android.graphics.Canvas)}, {@link #onDraw(android.graphics.Canvas)}, 3218 * {@link #dispatchDraw(android.graphics.Canvas)} or any related method.</p> 3219 * 3220 * @param child the child view to add 3221 * @param params the layout parameters to set on the child 3222 */ 3223 public void addView(View child, LayoutParams params) { 3224 addView(child, -1, params); 3225 } 3226 3227 /** 3228 * Adds a child view with the specified layout parameters. 3229 * 3230 * <p><strong>Note:</strong> do not invoke this method from 3231 * {@link #draw(android.graphics.Canvas)}, {@link #onDraw(android.graphics.Canvas)}, 3232 * {@link #dispatchDraw(android.graphics.Canvas)} or any related method.</p> 3233 * 3234 * @param child the child view to add 3235 * @param index the position at which to add the child 3236 * @param params the layout parameters to set on the child 3237 */ 3238 public void addView(View child, int index, LayoutParams params) { 3239 if (DBG) { 3240 System.out.println(this + " addView"); 3241 } 3242 3243 // addViewInner() will call child.requestLayout() when setting the new LayoutParams 3244 // therefore, we call requestLayout() on ourselves before, so that the child's request 3245 // will be blocked at our level 3246 requestLayout(); 3247 invalidate(true); 3248 addViewInner(child, index, params, false); 3249 } 3250 3251 /** 3252 * {@inheritDoc} 3253 */ 3254 public void updateViewLayout(View view, ViewGroup.LayoutParams params) { 3255 if (!checkLayoutParams(params)) { 3256 throw new IllegalArgumentException("Invalid LayoutParams supplied to " + this); 3257 } 3258 if (view.mParent != this) { 3259 throw new IllegalArgumentException("Given view not a child of " + this); 3260 } 3261 view.setLayoutParams(params); 3262 } 3263 3264 /** 3265 * {@inheritDoc} 3266 */ 3267 protected boolean checkLayoutParams(ViewGroup.LayoutParams p) { 3268 return p != null; 3269 } 3270 3271 /** 3272 * Interface definition for a callback to be invoked when the hierarchy 3273 * within this view changed. The hierarchy changes whenever a child is added 3274 * to or removed from this view. 3275 */ 3276 public interface OnHierarchyChangeListener { 3277 /** 3278 * Called when a new child is added to a parent view. 3279 * 3280 * @param parent the view in which a child was added 3281 * @param child the new child view added in the hierarchy 3282 */ 3283 void onChildViewAdded(View parent, View child); 3284 3285 /** 3286 * Called when a child is removed from a parent view. 3287 * 3288 * @param parent the view from which the child was removed 3289 * @param child the child removed from the hierarchy 3290 */ 3291 void onChildViewRemoved(View parent, View child); 3292 } 3293 3294 /** 3295 * Register a callback to be invoked when a child is added to or removed 3296 * from this view. 3297 * 3298 * @param listener the callback to invoke on hierarchy change 3299 */ 3300 public void setOnHierarchyChangeListener(OnHierarchyChangeListener listener) { 3301 mOnHierarchyChangeListener = listener; 3302 } 3303 3304 /** 3305 * @hide 3306 */ 3307 protected void onViewAdded(View child) { 3308 if (mOnHierarchyChangeListener != null) { 3309 mOnHierarchyChangeListener.onChildViewAdded(this, child); 3310 } 3311 } 3312 3313 /** 3314 * @hide 3315 */ 3316 protected void onViewRemoved(View child) { 3317 if (mOnHierarchyChangeListener != null) { 3318 mOnHierarchyChangeListener.onChildViewRemoved(this, child); 3319 } 3320 } 3321 3322 /** 3323 * Adds a view during layout. This is useful if in your onLayout() method, 3324 * you need to add more views (as does the list view for example). 3325 * 3326 * If index is negative, it means put it at the end of the list. 3327 * 3328 * @param child the view to add to the group 3329 * @param index the index at which the child must be added 3330 * @param params the layout parameters to associate with the child 3331 * @return true if the child was added, false otherwise 3332 */ 3333 protected boolean addViewInLayout(View child, int index, LayoutParams params) { 3334 return addViewInLayout(child, index, params, false); 3335 } 3336 3337 /** 3338 * Adds a view during layout. This is useful if in your onLayout() method, 3339 * you need to add more views (as does the list view for example). 3340 * 3341 * If index is negative, it means put it at the end of the list. 3342 * 3343 * @param child the view to add to the group 3344 * @param index the index at which the child must be added 3345 * @param params the layout parameters to associate with the child 3346 * @param preventRequestLayout if true, calling this method will not trigger a 3347 * layout request on child 3348 * @return true if the child was added, false otherwise 3349 */ 3350 protected boolean addViewInLayout(View child, int index, LayoutParams params, 3351 boolean preventRequestLayout) { 3352 child.mParent = null; 3353 addViewInner(child, index, params, preventRequestLayout); 3354 child.mPrivateFlags = (child.mPrivateFlags & ~DIRTY_MASK) | DRAWN; 3355 return true; 3356 } 3357 3358 /** 3359 * Prevents the specified child to be laid out during the next layout pass. 3360 * 3361 * @param child the child on which to perform the cleanup 3362 */ 3363 protected void cleanupLayoutState(View child) { 3364 child.mPrivateFlags &= ~View.FORCE_LAYOUT; 3365 } 3366 3367 private void addViewInner(View child, int index, LayoutParams params, 3368 boolean preventRequestLayout) { 3369 3370 if (mTransition != null) { 3371 // Don't prevent other add transitions from completing, but cancel remove 3372 // transitions to let them complete the process before we add to the container 3373 mTransition.cancel(LayoutTransition.DISAPPEARING); 3374 } 3375 3376 if (child.getParent() != null) { 3377 throw new IllegalStateException("The specified child already has a parent. " + 3378 "You must call removeView() on the child's parent first."); 3379 } 3380 3381 if (mTransition != null) { 3382 mTransition.addChild(this, child); 3383 } 3384 3385 if (!checkLayoutParams(params)) { 3386 params = generateLayoutParams(params); 3387 } 3388 3389 if (preventRequestLayout) { 3390 child.mLayoutParams = params; 3391 } else { 3392 child.setLayoutParams(params); 3393 } 3394 3395 if (index < 0) { 3396 index = mChildrenCount; 3397 } 3398 3399 addInArray(child, index); 3400 3401 // tell our children 3402 if (preventRequestLayout) { 3403 child.assignParent(this); 3404 } else { 3405 child.mParent = this; 3406 } 3407 3408 if (child.hasFocus()) { 3409 requestChildFocus(child, child.findFocus()); 3410 } 3411 3412 AttachInfo ai = mAttachInfo; 3413 if (ai != null && (mGroupFlags & FLAG_PREVENT_DISPATCH_ATTACHED_TO_WINDOW) == 0) { 3414 boolean lastKeepOn = ai.mKeepScreenOn; 3415 ai.mKeepScreenOn = false; 3416 child.dispatchAttachedToWindow(mAttachInfo, (mViewFlags&VISIBILITY_MASK)); 3417 if (ai.mKeepScreenOn) { 3418 needGlobalAttributesUpdate(true); 3419 } 3420 ai.mKeepScreenOn = lastKeepOn; 3421 } 3422 3423 onViewAdded(child); 3424 3425 if ((child.mViewFlags & DUPLICATE_PARENT_STATE) == DUPLICATE_PARENT_STATE) { 3426 mGroupFlags |= FLAG_NOTIFY_CHILDREN_ON_DRAWABLE_STATE_CHANGE; 3427 } 3428 3429 if (child.hasTransientState()) { 3430 childHasTransientStateChanged(child, true); 3431 } 3432 } 3433 3434 private void addInArray(View child, int index) { 3435 View[] children = mChildren; 3436 final int count = mChildrenCount; 3437 final int size = children.length; 3438 if (index == count) { 3439 if (size == count) { 3440 mChildren = new View[size + ARRAY_CAPACITY_INCREMENT]; 3441 System.arraycopy(children, 0, mChildren, 0, size); 3442 children = mChildren; 3443 } 3444 children[mChildrenCount++] = child; 3445 } else if (index < count) { 3446 if (size == count) { 3447 mChildren = new View[size + ARRAY_CAPACITY_INCREMENT]; 3448 System.arraycopy(children, 0, mChildren, 0, index); 3449 System.arraycopy(children, index, mChildren, index + 1, count - index); 3450 children = mChildren; 3451 } else { 3452 System.arraycopy(children, index, children, index + 1, count - index); 3453 } 3454 children[index] = child; 3455 mChildrenCount++; 3456 if (mLastTouchDownIndex >= index) { 3457 mLastTouchDownIndex++; 3458 } 3459 } else { 3460 throw new IndexOutOfBoundsException("index=" + index + " count=" + count); 3461 } 3462 } 3463 3464 // This method also sets the child's mParent to null 3465 private void removeFromArray(int index) { 3466 final View[] children = mChildren; 3467 if (!(mTransitioningViews != null && mTransitioningViews.contains(children[index]))) { 3468 children[index].mParent = null; 3469 } 3470 final int count = mChildrenCount; 3471 if (index == count - 1) { 3472 children[--mChildrenCount] = null; 3473 } else if (index >= 0 && index < count) { 3474 System.arraycopy(children, index + 1, children, index, count - index - 1); 3475 children[--mChildrenCount] = null; 3476 } else { 3477 throw new IndexOutOfBoundsException(); 3478 } 3479 if (mLastTouchDownIndex == index) { 3480 mLastTouchDownTime = 0; 3481 mLastTouchDownIndex = -1; 3482 } else if (mLastTouchDownIndex > index) { 3483 mLastTouchDownIndex--; 3484 } 3485 } 3486 3487 // This method also sets the children's mParent to null 3488 private void removeFromArray(int start, int count) { 3489 final View[] children = mChildren; 3490 final int childrenCount = mChildrenCount; 3491 3492 start = Math.max(0, start); 3493 final int end = Math.min(childrenCount, start + count); 3494 3495 if (start == end) { 3496 return; 3497 } 3498 3499 if (end == childrenCount) { 3500 for (int i = start; i < end; i++) { 3501 children[i].mParent = null; 3502 children[i] = null; 3503 } 3504 } else { 3505 for (int i = start; i < end; i++) { 3506 children[i].mParent = null; 3507 } 3508 3509 // Since we're looping above, we might as well do the copy, but is arraycopy() 3510 // faster than the extra 2 bounds checks we would do in the loop? 3511 System.arraycopy(children, end, children, start, childrenCount - end); 3512 3513 for (int i = childrenCount - (end - start); i < childrenCount; i++) { 3514 children[i] = null; 3515 } 3516 } 3517 3518 mChildrenCount -= (end - start); 3519 } 3520 3521 private void bindLayoutAnimation(View child) { 3522 Animation a = mLayoutAnimationController.getAnimationForView(child); 3523 child.setAnimation(a); 3524 } 3525 3526 /** 3527 * Subclasses should override this method to set layout animation 3528 * parameters on the supplied child. 3529 * 3530 * @param child the child to associate with animation parameters 3531 * @param params the child's layout parameters which hold the animation 3532 * parameters 3533 * @param index the index of the child in the view group 3534 * @param count the number of children in the view group 3535 */ 3536 protected void attachLayoutAnimationParameters(View child, 3537 LayoutParams params, int index, int count) { 3538 LayoutAnimationController.AnimationParameters animationParams = 3539 params.layoutAnimationParameters; 3540 if (animationParams == null) { 3541 animationParams = new LayoutAnimationController.AnimationParameters(); 3542 params.layoutAnimationParameters = animationParams; 3543 } 3544 3545 animationParams.count = count; 3546 animationParams.index = index; 3547 } 3548 3549 /** 3550 * {@inheritDoc} 3551 * 3552 * <p><strong>Note:</strong> do not invoke this method from 3553 * {@link #draw(android.graphics.Canvas)}, {@link #onDraw(android.graphics.Canvas)}, 3554 * {@link #dispatchDraw(android.graphics.Canvas)} or any related method.</p> 3555 */ 3556 public void removeView(View view) { 3557 removeViewInternal(view); 3558 requestLayout(); 3559 invalidate(true); 3560 } 3561 3562 /** 3563 * Removes a view during layout. This is useful if in your onLayout() method, 3564 * you need to remove more views. 3565 * 3566 * <p><strong>Note:</strong> do not invoke this method from 3567 * {@link #draw(android.graphics.Canvas)}, {@link #onDraw(android.graphics.Canvas)}, 3568 * {@link #dispatchDraw(android.graphics.Canvas)} or any related method.</p> 3569 * 3570 * @param view the view to remove from the group 3571 */ 3572 public void removeViewInLayout(View view) { 3573 removeViewInternal(view); 3574 } 3575 3576 /** 3577 * Removes a range of views during layout. This is useful if in your onLayout() method, 3578 * you need to remove more views. 3579 * 3580 * <p><strong>Note:</strong> do not invoke this method from 3581 * {@link #draw(android.graphics.Canvas)}, {@link #onDraw(android.graphics.Canvas)}, 3582 * {@link #dispatchDraw(android.graphics.Canvas)} or any related method.</p> 3583 * 3584 * @param start the index of the first view to remove from the group 3585 * @param count the number of views to remove from the group 3586 */ 3587 public void removeViewsInLayout(int start, int count) { 3588 removeViewsInternal(start, count); 3589 } 3590 3591 /** 3592 * Removes the view at the specified position in the group. 3593 * 3594 * <p><strong>Note:</strong> do not invoke this method from 3595 * {@link #draw(android.graphics.Canvas)}, {@link #onDraw(android.graphics.Canvas)}, 3596 * {@link #dispatchDraw(android.graphics.Canvas)} or any related method.</p> 3597 * 3598 * @param index the position in the group of the view to remove 3599 */ 3600 public void removeViewAt(int index) { 3601 removeViewInternal(index, getChildAt(index)); 3602 requestLayout(); 3603 invalidate(true); 3604 } 3605 3606 /** 3607 * Removes the specified range of views from the group. 3608 * 3609 * <p><strong>Note:</strong> do not invoke this method from 3610 * {@link #draw(android.graphics.Canvas)}, {@link #onDraw(android.graphics.Canvas)}, 3611 * {@link #dispatchDraw(android.graphics.Canvas)} or any related method.</p> 3612 * 3613 * @param start the first position in the group of the range of views to remove 3614 * @param count the number of views to remove 3615 */ 3616 public void removeViews(int start, int count) { 3617 removeViewsInternal(start, count); 3618 requestLayout(); 3619 invalidate(true); 3620 } 3621 3622 private void removeViewInternal(View view) { 3623 final int index = indexOfChild(view); 3624 if (index >= 0) { 3625 removeViewInternal(index, view); 3626 } 3627 } 3628 3629 private void removeViewInternal(int index, View view) { 3630 3631 if (mTransition != null) { 3632 mTransition.removeChild(this, view); 3633 } 3634 3635 boolean clearChildFocus = false; 3636 if (view == mFocused) { 3637 view.unFocus(); 3638 clearChildFocus = true; 3639 } 3640 3641 view.clearAccessibilityFocus(); 3642 3643 cancelTouchTarget(view); 3644 cancelHoverTarget(view); 3645 3646 if (view.getAnimation() != null || 3647 (mTransitioningViews != null && mTransitioningViews.contains(view))) { 3648 addDisappearingView(view); 3649 } else if (view.mAttachInfo != null) { 3650 view.dispatchDetachedFromWindow(); 3651 } 3652 3653 if (view.hasTransientState()) { 3654 childHasTransientStateChanged(view, false); 3655 } 3656 3657 onViewRemoved(view); 3658 3659 needGlobalAttributesUpdate(false); 3660 3661 removeFromArray(index); 3662 3663 if (clearChildFocus) { 3664 clearChildFocus(view); 3665 ensureInputFocusOnFirstFocusable(); 3666 } 3667 3668 if (view.isAccessibilityFocused()) { 3669 view.clearAccessibilityFocus(); 3670 } 3671 } 3672 3673 /** 3674 * Sets the LayoutTransition object for this ViewGroup. If the LayoutTransition object is 3675 * not null, changes in layout which occur because of children being added to or removed from 3676 * the ViewGroup will be animated according to the animations defined in that LayoutTransition 3677 * object. By default, the transition object is null (so layout changes are not animated). 3678 * 3679 * @param transition The LayoutTransition object that will animated changes in layout. A value 3680 * of <code>null</code> means no transition will run on layout changes. 3681 * @attr ref android.R.styleable#ViewGroup_animateLayoutChanges 3682 */ 3683 public void setLayoutTransition(LayoutTransition transition) { 3684 if (mTransition != null) { 3685 mTransition.removeTransitionListener(mLayoutTransitionListener); 3686 } 3687 mTransition = transition; 3688 if (mTransition != null) { 3689 mTransition.addTransitionListener(mLayoutTransitionListener); 3690 } 3691 } 3692 3693 /** 3694 * Gets the LayoutTransition object for this ViewGroup. If the LayoutTransition object is 3695 * not null, changes in layout which occur because of children being added to or removed from 3696 * the ViewGroup will be animated according to the animations defined in that LayoutTransition 3697 * object. By default, the transition object is null (so layout changes are not animated). 3698 * 3699 * @return LayoutTranstion The LayoutTransition object that will animated changes in layout. 3700 * A value of <code>null</code> means no transition will run on layout changes. 3701 */ 3702 public LayoutTransition getLayoutTransition() { 3703 return mTransition; 3704 } 3705 3706 private void removeViewsInternal(int start, int count) { 3707 final View focused = mFocused; 3708 final boolean detach = mAttachInfo != null; 3709 View clearChildFocus = null; 3710 3711 final View[] children = mChildren; 3712 final int end = start + count; 3713 3714 for (int i = start; i < end; i++) { 3715 final View view = children[i]; 3716 3717 if (mTransition != null) { 3718 mTransition.removeChild(this, view); 3719 } 3720 3721 if (view == focused) { 3722 view.unFocus(); 3723 clearChildFocus = view; 3724 } 3725 3726 view.clearAccessibilityFocus(); 3727 3728 cancelTouchTarget(view); 3729 cancelHoverTarget(view); 3730 3731 if (view.getAnimation() != null || 3732 (mTransitioningViews != null && mTransitioningViews.contains(view))) { 3733 addDisappearingView(view); 3734 } else if (detach) { 3735 view.dispatchDetachedFromWindow(); 3736 } 3737 3738 if (view.hasTransientState()) { 3739 childHasTransientStateChanged(view, false); 3740 } 3741 3742 needGlobalAttributesUpdate(false); 3743 3744 onViewRemoved(view); 3745 } 3746 3747 removeFromArray(start, count); 3748 3749 if (clearChildFocus != null) { 3750 clearChildFocus(clearChildFocus); 3751 ensureInputFocusOnFirstFocusable(); 3752 } 3753 } 3754 3755 /** 3756 * Call this method to remove all child views from the 3757 * ViewGroup. 3758 * 3759 * <p><strong>Note:</strong> do not invoke this method from 3760 * {@link #draw(android.graphics.Canvas)}, {@link #onDraw(android.graphics.Canvas)}, 3761 * {@link #dispatchDraw(android.graphics.Canvas)} or any related method.</p> 3762 */ 3763 public void removeAllViews() { 3764 removeAllViewsInLayout(); 3765 requestLayout(); 3766 invalidate(true); 3767 } 3768 3769 /** 3770 * Called by a ViewGroup subclass to remove child views from itself, 3771 * when it must first know its size on screen before it can calculate how many 3772 * child views it will render. An example is a Gallery or a ListView, which 3773 * may "have" 50 children, but actually only render the number of children 3774 * that can currently fit inside the object on screen. Do not call 3775 * this method unless you are extending ViewGroup and understand the 3776 * view measuring and layout pipeline. 3777 * 3778 * <p><strong>Note:</strong> do not invoke this method from 3779 * {@link #draw(android.graphics.Canvas)}, {@link #onDraw(android.graphics.Canvas)}, 3780 * {@link #dispatchDraw(android.graphics.Canvas)} or any related method.</p> 3781 */ 3782 public void removeAllViewsInLayout() { 3783 final int count = mChildrenCount; 3784 if (count <= 0) { 3785 return; 3786 } 3787 3788 final View[] children = mChildren; 3789 mChildrenCount = 0; 3790 3791 final View focused = mFocused; 3792 final boolean detach = mAttachInfo != null; 3793 View clearChildFocus = null; 3794 3795 needGlobalAttributesUpdate(false); 3796 3797 for (int i = count - 1; i >= 0; i--) { 3798 final View view = children[i]; 3799 3800 if (mTransition != null) { 3801 mTransition.removeChild(this, view); 3802 } 3803 3804 if (view == focused) { 3805 view.unFocus(); 3806 clearChildFocus = view; 3807 } 3808 3809 view.clearAccessibilityFocus(); 3810 3811 cancelTouchTarget(view); 3812 cancelHoverTarget(view); 3813 3814 if (view.getAnimation() != null || 3815 (mTransitioningViews != null && mTransitioningViews.contains(view))) { 3816 addDisappearingView(view); 3817 } else if (detach) { 3818 view.dispatchDetachedFromWindow(); 3819 } 3820 3821 if (view.hasTransientState()) { 3822 childHasTransientStateChanged(view, false); 3823 } 3824 3825 onViewRemoved(view); 3826 3827 view.mParent = null; 3828 children[i] = null; 3829 } 3830 3831 if (clearChildFocus != null) { 3832 clearChildFocus(clearChildFocus); 3833 ensureInputFocusOnFirstFocusable(); 3834 } 3835 } 3836 3837 /** 3838 * Finishes the removal of a detached view. This method will dispatch the detached from 3839 * window event and notify the hierarchy change listener. 3840 * 3841 * @param child the child to be definitely removed from the view hierarchy 3842 * @param animate if true and the view has an animation, the view is placed in the 3843 * disappearing views list, otherwise, it is detached from the window 3844 * 3845 * @see #attachViewToParent(View, int, android.view.ViewGroup.LayoutParams) 3846 * @see #detachAllViewsFromParent() 3847 * @see #detachViewFromParent(View) 3848 * @see #detachViewFromParent(int) 3849 */ 3850 protected void removeDetachedView(View child, boolean animate) { 3851 if (mTransition != null) { 3852 mTransition.removeChild(this, child); 3853 } 3854 3855 if (child == mFocused) { 3856 child.clearFocus(); 3857 } 3858 3859 child.clearAccessibilityFocus(); 3860 3861 cancelTouchTarget(child); 3862 cancelHoverTarget(child); 3863 3864 if ((animate && child.getAnimation() != null) || 3865 (mTransitioningViews != null && mTransitioningViews.contains(child))) { 3866 addDisappearingView(child); 3867 } else if (child.mAttachInfo != null) { 3868 child.dispatchDetachedFromWindow(); 3869 } 3870 3871 if (child.hasTransientState()) { 3872 childHasTransientStateChanged(child, false); 3873 } 3874 3875 onViewRemoved(child); 3876 } 3877 3878 /** 3879 * Attaches a view to this view group. Attaching a view assigns this group as the parent, 3880 * sets the layout parameters and puts the view in the list of children so it can be retrieved 3881 * by calling {@link #getChildAt(int)}. 3882 * 3883 * This method should be called only for view which were detached from their parent. 3884 * 3885 * @param child the child to attach 3886 * @param index the index at which the child should be attached 3887 * @param params the layout parameters of the child 3888 * 3889 * @see #removeDetachedView(View, boolean) 3890 * @see #detachAllViewsFromParent() 3891 * @see #detachViewFromParent(View) 3892 * @see #detachViewFromParent(int) 3893 */ 3894 protected void attachViewToParent(View child, int index, LayoutParams params) { 3895 child.mLayoutParams = params; 3896 3897 if (index < 0) { 3898 index = mChildrenCount; 3899 } 3900 3901 addInArray(child, index); 3902 3903 child.mParent = this; 3904 child.mPrivateFlags = (child.mPrivateFlags & ~DIRTY_MASK & ~DRAWING_CACHE_VALID) | 3905 DRAWN | INVALIDATED; 3906 this.mPrivateFlags |= INVALIDATED; 3907 3908 if (child.hasFocus()) { 3909 requestChildFocus(child, child.findFocus()); 3910 } 3911 } 3912 3913 /** 3914 * Detaches a view from its parent. Detaching a view should be temporary and followed 3915 * either by a call to {@link #attachViewToParent(View, int, android.view.ViewGroup.LayoutParams)} 3916 * or a call to {@link #removeDetachedView(View, boolean)}. When a view is detached, 3917 * its parent is null and cannot be retrieved by a call to {@link #getChildAt(int)}. 3918 * 3919 * @param child the child to detach 3920 * 3921 * @see #detachViewFromParent(int) 3922 * @see #detachViewsFromParent(int, int) 3923 * @see #detachAllViewsFromParent() 3924 * @see #attachViewToParent(View, int, android.view.ViewGroup.LayoutParams) 3925 * @see #removeDetachedView(View, boolean) 3926 */ 3927 protected void detachViewFromParent(View child) { 3928 removeFromArray(indexOfChild(child)); 3929 } 3930 3931 /** 3932 * Detaches a view from its parent. Detaching a view should be temporary and followed 3933 * either by a call to {@link #attachViewToParent(View, int, android.view.ViewGroup.LayoutParams)} 3934 * or a call to {@link #removeDetachedView(View, boolean)}. When a view is detached, 3935 * its parent is null and cannot be retrieved by a call to {@link #getChildAt(int)}. 3936 * 3937 * @param index the index of the child to detach 3938 * 3939 * @see #detachViewFromParent(View) 3940 * @see #detachAllViewsFromParent() 3941 * @see #detachViewsFromParent(int, int) 3942 * @see #attachViewToParent(View, int, android.view.ViewGroup.LayoutParams) 3943 * @see #removeDetachedView(View, boolean) 3944 */ 3945 protected void detachViewFromParent(int index) { 3946 removeFromArray(index); 3947 } 3948 3949 /** 3950 * Detaches a range of view from their parent. Detaching a view should be temporary and followed 3951 * either by a call to {@link #attachViewToParent(View, int, android.view.ViewGroup.LayoutParams)} 3952 * or a call to {@link #removeDetachedView(View, boolean)}. When a view is detached, its 3953 * parent is null and cannot be retrieved by a call to {@link #getChildAt(int)}. 3954 * 3955 * @param start the first index of the childrend range to detach 3956 * @param count the number of children to detach 3957 * 3958 * @see #detachViewFromParent(View) 3959 * @see #detachViewFromParent(int) 3960 * @see #detachAllViewsFromParent() 3961 * @see #attachViewToParent(View, int, android.view.ViewGroup.LayoutParams) 3962 * @see #removeDetachedView(View, boolean) 3963 */ 3964 protected void detachViewsFromParent(int start, int count) { 3965 removeFromArray(start, count); 3966 } 3967 3968 /** 3969 * Detaches all views from the parent. Detaching a view should be temporary and followed 3970 * either by a call to {@link #attachViewToParent(View, int, android.view.ViewGroup.LayoutParams)} 3971 * or a call to {@link #removeDetachedView(View, boolean)}. When a view is detached, 3972 * its parent is null and cannot be retrieved by a call to {@link #getChildAt(int)}. 3973 * 3974 * @see #detachViewFromParent(View) 3975 * @see #detachViewFromParent(int) 3976 * @see #detachViewsFromParent(int, int) 3977 * @see #attachViewToParent(View, int, android.view.ViewGroup.LayoutParams) 3978 * @see #removeDetachedView(View, boolean) 3979 */ 3980 protected void detachAllViewsFromParent() { 3981 final int count = mChildrenCount; 3982 if (count <= 0) { 3983 return; 3984 } 3985 3986 final View[] children = mChildren; 3987 mChildrenCount = 0; 3988 3989 for (int i = count - 1; i >= 0; i--) { 3990 children[i].mParent = null; 3991 children[i] = null; 3992 } 3993 } 3994 3995 /** 3996 * Don't call or override this method. It is used for the implementation of 3997 * the view hierarchy. 3998 */ 3999 public final void invalidateChild(View child, final Rect dirty) { 4000 ViewParent parent = this; 4001 4002 final AttachInfo attachInfo = mAttachInfo; 4003 if (attachInfo != null) { 4004 // If the child is drawing an animation, we want to copy this flag onto 4005 // ourselves and the parent to make sure the invalidate request goes 4006 // through 4007 final boolean drawAnimation = (child.mPrivateFlags & DRAW_ANIMATION) == DRAW_ANIMATION; 4008 4009 // Check whether the child that requests the invalidate is fully opaque 4010 // Views being animated or transformed are not considered opaque because we may 4011 // be invalidating their old position and need the parent to paint behind them. 4012 Matrix childMatrix = child.getMatrix(); 4013 final boolean isOpaque = child.isOpaque() && !drawAnimation && 4014 child.getAnimation() == null && childMatrix.isIdentity(); 4015 // Mark the child as dirty, using the appropriate flag 4016 // Make sure we do not set both flags at the same time 4017 int opaqueFlag = isOpaque ? DIRTY_OPAQUE : DIRTY; 4018 4019 if (child.mLayerType != LAYER_TYPE_NONE) { 4020 mPrivateFlags |= INVALIDATED; 4021 mPrivateFlags &= ~DRAWING_CACHE_VALID; 4022 child.mLocalDirtyRect.union(dirty); 4023 } 4024 4025 final int[] location = attachInfo.mInvalidateChildLocation; 4026 location[CHILD_LEFT_INDEX] = child.mLeft; 4027 location[CHILD_TOP_INDEX] = child.mTop; 4028 if (!childMatrix.isIdentity()) { 4029 RectF boundingRect = attachInfo.mTmpTransformRect; 4030 boundingRect.set(dirty); 4031 //boundingRect.inset(-0.5f, -0.5f); 4032 childMatrix.mapRect(boundingRect); 4033 dirty.set((int) (boundingRect.left - 0.5f), 4034 (int) (boundingRect.top - 0.5f), 4035 (int) (boundingRect.right + 0.5f), 4036 (int) (boundingRect.bottom + 0.5f)); 4037 } 4038 4039 do { 4040 View view = null; 4041 if (parent instanceof View) { 4042 view = (View) parent; 4043 } 4044 4045 if (drawAnimation) { 4046 if (view != null) { 4047 view.mPrivateFlags |= DRAW_ANIMATION; 4048 } else if (parent instanceof ViewRootImpl) { 4049 ((ViewRootImpl) parent).mIsAnimating = true; 4050 } 4051 } 4052 4053 // If the parent is dirty opaque or not dirty, mark it dirty with the opaque 4054 // flag coming from the child that initiated the invalidate 4055 if (view != null) { 4056 if ((view.mViewFlags & FADING_EDGE_MASK) != 0 && 4057 view.getSolidColor() == 0) { 4058 opaqueFlag = DIRTY; 4059 } 4060 if ((view.mPrivateFlags & DIRTY_MASK) != DIRTY) { 4061 view.mPrivateFlags = (view.mPrivateFlags & ~DIRTY_MASK) | opaqueFlag; 4062 } 4063 } 4064 4065 parent = parent.invalidateChildInParent(location, dirty); 4066 if (view != null) { 4067 // Account for transform on current parent 4068 Matrix m = view.getMatrix(); 4069 if (!m.isIdentity()) { 4070 RectF boundingRect = attachInfo.mTmpTransformRect; 4071 boundingRect.set(dirty); 4072 m.mapRect(boundingRect); 4073 dirty.set((int) (boundingRect.left - 0.5f), 4074 (int) (boundingRect.top - 0.5f), 4075 (int) (boundingRect.right + 0.5f), 4076 (int) (boundingRect.bottom + 0.5f)); 4077 } 4078 } 4079 } while (parent != null); 4080 } 4081 } 4082 4083 /** 4084 * Don't call or override this method. It is used for the implementation of 4085 * the view hierarchy. 4086 * 4087 * This implementation returns null if this ViewGroup does not have a parent, 4088 * if this ViewGroup is already fully invalidated or if the dirty rectangle 4089 * does not intersect with this ViewGroup's bounds. 4090 */ 4091 public ViewParent invalidateChildInParent(final int[] location, final Rect dirty) { 4092 if ((mPrivateFlags & DRAWN) == DRAWN || 4093 (mPrivateFlags & DRAWING_CACHE_VALID) == DRAWING_CACHE_VALID) { 4094 if ((mGroupFlags & (FLAG_OPTIMIZE_INVALIDATE | FLAG_ANIMATION_DONE)) != 4095 FLAG_OPTIMIZE_INVALIDATE) { 4096 dirty.offset(location[CHILD_LEFT_INDEX] - mScrollX, 4097 location[CHILD_TOP_INDEX] - mScrollY); 4098 4099 final int left = mLeft; 4100 final int top = mTop; 4101 4102 if ((mGroupFlags & FLAG_CLIP_CHILDREN) != FLAG_CLIP_CHILDREN || 4103 dirty.intersect(0, 0, mRight - left, mBottom - top) || 4104 (mPrivateFlags & DRAW_ANIMATION) == DRAW_ANIMATION) { 4105 mPrivateFlags &= ~DRAWING_CACHE_VALID; 4106 4107 location[CHILD_LEFT_INDEX] = left; 4108 location[CHILD_TOP_INDEX] = top; 4109 4110 if (mLayerType != LAYER_TYPE_NONE) { 4111 mPrivateFlags |= INVALIDATED; 4112 mLocalDirtyRect.union(dirty); 4113 } 4114 4115 return mParent; 4116 } 4117 } else { 4118 mPrivateFlags &= ~DRAWN & ~DRAWING_CACHE_VALID; 4119 4120 location[CHILD_LEFT_INDEX] = mLeft; 4121 location[CHILD_TOP_INDEX] = mTop; 4122 if ((mGroupFlags & FLAG_CLIP_CHILDREN) == FLAG_CLIP_CHILDREN) { 4123 dirty.set(0, 0, mRight - mLeft, mBottom - mTop); 4124 } else { 4125 // in case the dirty rect extends outside the bounds of this container 4126 dirty.union(0, 0, mRight - mLeft, mBottom - mTop); 4127 } 4128 4129 if (mLayerType != LAYER_TYPE_NONE) { 4130 mPrivateFlags |= INVALIDATED; 4131 mLocalDirtyRect.union(dirty); 4132 } 4133 4134 return mParent; 4135 } 4136 } 4137 4138 return null; 4139 } 4140 4141 /** 4142 * Quick invalidation method called by View.invalidateViewProperty. This doesn't set the 4143 * DRAWN flags and doesn't handle the Animation logic that the default invalidation methods 4144 * do; all we want to do here is schedule a traversal with the appropriate dirty rect. 4145 * 4146 * @hide 4147 */ 4148 public void invalidateChildFast(View child, final Rect dirty) { 4149 ViewParent parent = this; 4150 4151 final AttachInfo attachInfo = mAttachInfo; 4152 if (attachInfo != null) { 4153 if (child.mLayerType != LAYER_TYPE_NONE) { 4154 child.mLocalDirtyRect.union(dirty); 4155 } 4156 4157 int left = child.mLeft; 4158 int top = child.mTop; 4159 if (!child.getMatrix().isIdentity()) { 4160 child.transformRect(dirty); 4161 } 4162 4163 do { 4164 if (parent instanceof ViewGroup) { 4165 ViewGroup parentVG = (ViewGroup) parent; 4166 if (parentVG.mLayerType != LAYER_TYPE_NONE) { 4167 // Layered parents should be recreated, not just re-issued 4168 parentVG.invalidate(); 4169 parent = null; 4170 } else { 4171 parent = parentVG.invalidateChildInParentFast(left, top, dirty); 4172 left = parentVG.mLeft; 4173 top = parentVG.mTop; 4174 } 4175 } else { 4176 // Reached the top; this calls into the usual invalidate method in 4177 // ViewRootImpl, which schedules a traversal 4178 final int[] location = attachInfo.mInvalidateChildLocation; 4179 location[0] = left; 4180 location[1] = top; 4181 parent = parent.invalidateChildInParent(location, dirty); 4182 } 4183 } while (parent != null); 4184 } 4185 } 4186 4187 /** 4188 * Quick invalidation method that simply transforms the dirty rect into the parent's 4189 * coordinate system, pruning the invalidation if the parent has already been invalidated. 4190 */ 4191 private ViewParent invalidateChildInParentFast(int left, int top, final Rect dirty) { 4192 if ((mPrivateFlags & DRAWN) == DRAWN || 4193 (mPrivateFlags & DRAWING_CACHE_VALID) == DRAWING_CACHE_VALID) { 4194 dirty.offset(left - mScrollX, top - mScrollY); 4195 4196 if ((mGroupFlags & FLAG_CLIP_CHILDREN) == 0 || 4197 dirty.intersect(0, 0, mRight - mLeft, mBottom - mTop)) { 4198 4199 if (mLayerType != LAYER_TYPE_NONE) { 4200 mLocalDirtyRect.union(dirty); 4201 } 4202 if (!getMatrix().isIdentity()) { 4203 transformRect(dirty); 4204 } 4205 4206 return mParent; 4207 } 4208 } 4209 4210 return null; 4211 } 4212 4213 /** 4214 * Offset a rectangle that is in a descendant's coordinate 4215 * space into our coordinate space. 4216 * @param descendant A descendant of this view 4217 * @param rect A rectangle defined in descendant's coordinate space. 4218 */ 4219 public final void offsetDescendantRectToMyCoords(View descendant, Rect rect) { 4220 offsetRectBetweenParentAndChild(descendant, rect, true, false); 4221 } 4222 4223 /** 4224 * Offset a rectangle that is in our coordinate space into an ancestor's 4225 * coordinate space. 4226 * @param descendant A descendant of this view 4227 * @param rect A rectangle defined in descendant's coordinate space. 4228 */ 4229 public final void offsetRectIntoDescendantCoords(View descendant, Rect rect) { 4230 offsetRectBetweenParentAndChild(descendant, rect, false, false); 4231 } 4232 4233 /** 4234 * Helper method that offsets a rect either from parent to descendant or 4235 * descendant to parent. 4236 */ 4237 void offsetRectBetweenParentAndChild(View descendant, Rect rect, 4238 boolean offsetFromChildToParent, boolean clipToBounds) { 4239 4240 // already in the same coord system :) 4241 if (descendant == this) { 4242 return; 4243 } 4244 4245 ViewParent theParent = descendant.mParent; 4246 4247 // search and offset up to the parent 4248 while ((theParent != null) 4249 && (theParent instanceof View) 4250 && (theParent != this)) { 4251 4252 if (offsetFromChildToParent) { 4253 rect.offset(descendant.mLeft - descendant.mScrollX, 4254 descendant.mTop - descendant.mScrollY); 4255 if (clipToBounds) { 4256 View p = (View) theParent; 4257 rect.intersect(0, 0, p.mRight - p.mLeft, p.mBottom - p.mTop); 4258 } 4259 } else { 4260 if (clipToBounds) { 4261 View p = (View) theParent; 4262 rect.intersect(0, 0, p.mRight - p.mLeft, p.mBottom - p.mTop); 4263 } 4264 rect.offset(descendant.mScrollX - descendant.mLeft, 4265 descendant.mScrollY - descendant.mTop); 4266 } 4267 4268 descendant = (View) theParent; 4269 theParent = descendant.mParent; 4270 } 4271 4272 // now that we are up to this view, need to offset one more time 4273 // to get into our coordinate space 4274 if (theParent == this) { 4275 if (offsetFromChildToParent) { 4276 rect.offset(descendant.mLeft - descendant.mScrollX, 4277 descendant.mTop - descendant.mScrollY); 4278 } else { 4279 rect.offset(descendant.mScrollX - descendant.mLeft, 4280 descendant.mScrollY - descendant.mTop); 4281 } 4282 } else { 4283 throw new IllegalArgumentException("parameter must be a descendant of this view"); 4284 } 4285 } 4286 4287 /** 4288 * Offset the vertical location of all children of this view by the specified number of pixels. 4289 * 4290 * @param offset the number of pixels to offset 4291 * 4292 * @hide 4293 */ 4294 public void offsetChildrenTopAndBottom(int offset) { 4295 final int count = mChildrenCount; 4296 final View[] children = mChildren; 4297 4298 for (int i = 0; i < count; i++) { 4299 final View v = children[i]; 4300 v.mTop += offset; 4301 v.mBottom += offset; 4302 if (v.mDisplayList != null) { 4303 v.mDisplayList.offsetTopBottom(offset); 4304 invalidateViewProperty(false, false); 4305 } 4306 } 4307 } 4308 4309 /** 4310 * {@inheritDoc} 4311 */ 4312 public boolean getChildVisibleRect(View child, Rect r, android.graphics.Point offset) { 4313 // It doesn't make a whole lot of sense to call this on a view that isn't attached, 4314 // but for some simple tests it can be useful. If we don't have attach info this 4315 // will allocate memory. 4316 final RectF rect = mAttachInfo != null ? mAttachInfo.mTmpTransformRect : new RectF(); 4317 rect.set(r); 4318 4319 if (!child.hasIdentityMatrix()) { 4320 child.getMatrix().mapRect(rect); 4321 } 4322 4323 int dx = child.mLeft - mScrollX; 4324 int dy = child.mTop - mScrollY; 4325 4326 rect.offset(dx, dy); 4327 4328 if (offset != null) { 4329 if (!child.hasIdentityMatrix()) { 4330 float[] position = mAttachInfo != null ? mAttachInfo.mTmpTransformLocation 4331 : new float[2]; 4332 position[0] = offset.x; 4333 position[1] = offset.y; 4334 child.getMatrix().mapPoints(position); 4335 offset.x = (int) (position[0] + 0.5f); 4336 offset.y = (int) (position[1] + 0.5f); 4337 } 4338 offset.x += dx; 4339 offset.y += dy; 4340 } 4341 4342 if (rect.intersect(0, 0, mRight - mLeft, mBottom - mTop)) { 4343 if (mParent == null) return true; 4344 r.set((int) (rect.left + 0.5f), (int) (rect.top + 0.5f), 4345 (int) (rect.right + 0.5f), (int) (rect.bottom + 0.5f)); 4346 return mParent.getChildVisibleRect(this, r, offset); 4347 } 4348 4349 return false; 4350 } 4351 4352 /** 4353 * {@inheritDoc} 4354 */ 4355 @Override 4356 public final void layout(int l, int t, int r, int b) { 4357 if (mTransition == null || !mTransition.isChangingLayout()) { 4358 if (mTransition != null) { 4359 mTransition.layoutChange(this); 4360 } 4361 super.layout(l, t, r, b); 4362 } else { 4363 // record the fact that we noop'd it; request layout when transition finishes 4364 mLayoutSuppressed = true; 4365 } 4366 } 4367 4368 /** 4369 * {@inheritDoc} 4370 */ 4371 @Override 4372 protected abstract void onLayout(boolean changed, 4373 int l, int t, int r, int b); 4374 4375 /** 4376 * Indicates whether the view group has the ability to animate its children 4377 * after the first layout. 4378 * 4379 * @return true if the children can be animated, false otherwise 4380 */ 4381 protected boolean canAnimate() { 4382 return mLayoutAnimationController != null; 4383 } 4384 4385 /** 4386 * Runs the layout animation. Calling this method triggers a relayout of 4387 * this view group. 4388 */ 4389 public void startLayoutAnimation() { 4390 if (mLayoutAnimationController != null) { 4391 mGroupFlags |= FLAG_RUN_ANIMATION; 4392 requestLayout(); 4393 } 4394 } 4395 4396 /** 4397 * Schedules the layout animation to be played after the next layout pass 4398 * of this view group. This can be used to restart the layout animation 4399 * when the content of the view group changes or when the activity is 4400 * paused and resumed. 4401 */ 4402 public void scheduleLayoutAnimation() { 4403 mGroupFlags |= FLAG_RUN_ANIMATION; 4404 } 4405 4406 /** 4407 * Sets the layout animation controller used to animate the group's 4408 * children after the first layout. 4409 * 4410 * @param controller the animation controller 4411 */ 4412 public void setLayoutAnimation(LayoutAnimationController controller) { 4413 mLayoutAnimationController = controller; 4414 if (mLayoutAnimationController != null) { 4415 mGroupFlags |= FLAG_RUN_ANIMATION; 4416 } 4417 } 4418 4419 /** 4420 * Returns the layout animation controller used to animate the group's 4421 * children. 4422 * 4423 * @return the current animation controller 4424 */ 4425 public LayoutAnimationController getLayoutAnimation() { 4426 return mLayoutAnimationController; 4427 } 4428 4429 /** 4430 * Indicates whether the children's drawing cache is used during a layout 4431 * animation. By default, the drawing cache is enabled but this will prevent 4432 * nested layout animations from working. To nest animations, you must disable 4433 * the cache. 4434 * 4435 * @return true if the animation cache is enabled, false otherwise 4436 * 4437 * @see #setAnimationCacheEnabled(boolean) 4438 * @see View#setDrawingCacheEnabled(boolean) 4439 */ 4440 @ViewDebug.ExportedProperty 4441 public boolean isAnimationCacheEnabled() { 4442 return (mGroupFlags & FLAG_ANIMATION_CACHE) == FLAG_ANIMATION_CACHE; 4443 } 4444 4445 /** 4446 * Enables or disables the children's drawing cache during a layout animation. 4447 * By default, the drawing cache is enabled but this will prevent nested 4448 * layout animations from working. To nest animations, you must disable the 4449 * cache. 4450 * 4451 * @param enabled true to enable the animation cache, false otherwise 4452 * 4453 * @see #isAnimationCacheEnabled() 4454 * @see View#setDrawingCacheEnabled(boolean) 4455 */ 4456 public void setAnimationCacheEnabled(boolean enabled) { 4457 setBooleanFlag(FLAG_ANIMATION_CACHE, enabled); 4458 } 4459 4460 /** 4461 * Indicates whether this ViewGroup will always try to draw its children using their 4462 * drawing cache. By default this property is enabled. 4463 * 4464 * @return true if the animation cache is enabled, false otherwise 4465 * 4466 * @see #setAlwaysDrawnWithCacheEnabled(boolean) 4467 * @see #setChildrenDrawnWithCacheEnabled(boolean) 4468 * @see View#setDrawingCacheEnabled(boolean) 4469 */ 4470 @ViewDebug.ExportedProperty(category = "drawing") 4471 public boolean isAlwaysDrawnWithCacheEnabled() { 4472 return (mGroupFlags & FLAG_ALWAYS_DRAWN_WITH_CACHE) == FLAG_ALWAYS_DRAWN_WITH_CACHE; 4473 } 4474 4475 /** 4476 * Indicates whether this ViewGroup will always try to draw its children using their 4477 * drawing cache. This property can be set to true when the cache rendering is 4478 * slightly different from the children's normal rendering. Renderings can be different, 4479 * for instance, when the cache's quality is set to low. 4480 * 4481 * When this property is disabled, the ViewGroup will use the drawing cache of its 4482 * children only when asked to. It's usually the task of subclasses to tell ViewGroup 4483 * when to start using the drawing cache and when to stop using it. 4484 * 4485 * @param always true to always draw with the drawing cache, false otherwise 4486 * 4487 * @see #isAlwaysDrawnWithCacheEnabled() 4488 * @see #setChildrenDrawnWithCacheEnabled(boolean) 4489 * @see View#setDrawingCacheEnabled(boolean) 4490 * @see View#setDrawingCacheQuality(int) 4491 */ 4492 public void setAlwaysDrawnWithCacheEnabled(boolean always) { 4493 setBooleanFlag(FLAG_ALWAYS_DRAWN_WITH_CACHE, always); 4494 } 4495 4496 /** 4497 * Indicates whether the ViewGroup is currently drawing its children using 4498 * their drawing cache. 4499 * 4500 * @return true if children should be drawn with their cache, false otherwise 4501 * 4502 * @see #setAlwaysDrawnWithCacheEnabled(boolean) 4503 * @see #setChildrenDrawnWithCacheEnabled(boolean) 4504 */ 4505 @ViewDebug.ExportedProperty(category = "drawing") 4506 protected boolean isChildrenDrawnWithCacheEnabled() { 4507 return (mGroupFlags & FLAG_CHILDREN_DRAWN_WITH_CACHE) == FLAG_CHILDREN_DRAWN_WITH_CACHE; 4508 } 4509 4510 /** 4511 * Tells the ViewGroup to draw its children using their drawing cache. This property 4512 * is ignored when {@link #isAlwaysDrawnWithCacheEnabled()} is true. A child's drawing cache 4513 * will be used only if it has been enabled. 4514 * 4515 * Subclasses should call this method to start and stop using the drawing cache when 4516 * they perform performance sensitive operations, like scrolling or animating. 4517 * 4518 * @param enabled true if children should be drawn with their cache, false otherwise 4519 * 4520 * @see #setAlwaysDrawnWithCacheEnabled(boolean) 4521 * @see #isChildrenDrawnWithCacheEnabled() 4522 */ 4523 protected void setChildrenDrawnWithCacheEnabled(boolean enabled) { 4524 setBooleanFlag(FLAG_CHILDREN_DRAWN_WITH_CACHE, enabled); 4525 } 4526 4527 /** 4528 * Indicates whether the ViewGroup is drawing its children in the order defined by 4529 * {@link #getChildDrawingOrder(int, int)}. 4530 * 4531 * @return true if children drawing order is defined by {@link #getChildDrawingOrder(int, int)}, 4532 * false otherwise 4533 * 4534 * @see #setChildrenDrawingOrderEnabled(boolean) 4535 * @see #getChildDrawingOrder(int, int) 4536 */ 4537 @ViewDebug.ExportedProperty(category = "drawing") 4538 protected boolean isChildrenDrawingOrderEnabled() { 4539 return (mGroupFlags & FLAG_USE_CHILD_DRAWING_ORDER) == FLAG_USE_CHILD_DRAWING_ORDER; 4540 } 4541 4542 /** 4543 * Tells the ViewGroup whether to draw its children in the order defined by the method 4544 * {@link #getChildDrawingOrder(int, int)}. 4545 * 4546 * @param enabled true if the order of the children when drawing is determined by 4547 * {@link #getChildDrawingOrder(int, int)}, false otherwise 4548 * 4549 * @see #isChildrenDrawingOrderEnabled() 4550 * @see #getChildDrawingOrder(int, int) 4551 */ 4552 protected void setChildrenDrawingOrderEnabled(boolean enabled) { 4553 setBooleanFlag(FLAG_USE_CHILD_DRAWING_ORDER, enabled); 4554 } 4555 4556 private void setBooleanFlag(int flag, boolean value) { 4557 if (value) { 4558 mGroupFlags |= flag; 4559 } else { 4560 mGroupFlags &= ~flag; 4561 } 4562 } 4563 4564 /** 4565 * Returns an integer indicating what types of drawing caches are kept in memory. 4566 * 4567 * @see #setPersistentDrawingCache(int) 4568 * @see #setAnimationCacheEnabled(boolean) 4569 * 4570 * @return one or a combination of {@link #PERSISTENT_NO_CACHE}, 4571 * {@link #PERSISTENT_ANIMATION_CACHE}, {@link #PERSISTENT_SCROLLING_CACHE} 4572 * and {@link #PERSISTENT_ALL_CACHES} 4573 */ 4574 @ViewDebug.ExportedProperty(category = "drawing", mapping = { 4575 @ViewDebug.IntToString(from = PERSISTENT_NO_CACHE, to = "NONE"), 4576 @ViewDebug.IntToString(from = PERSISTENT_ANIMATION_CACHE, to = "ANIMATION"), 4577 @ViewDebug.IntToString(from = PERSISTENT_SCROLLING_CACHE, to = "SCROLLING"), 4578 @ViewDebug.IntToString(from = PERSISTENT_ALL_CACHES, to = "ALL") 4579 }) 4580 public int getPersistentDrawingCache() { 4581 return mPersistentDrawingCache; 4582 } 4583 4584 /** 4585 * Indicates what types of drawing caches should be kept in memory after 4586 * they have been created. 4587 * 4588 * @see #getPersistentDrawingCache() 4589 * @see #setAnimationCacheEnabled(boolean) 4590 * 4591 * @param drawingCacheToKeep one or a combination of {@link #PERSISTENT_NO_CACHE}, 4592 * {@link #PERSISTENT_ANIMATION_CACHE}, {@link #PERSISTENT_SCROLLING_CACHE} 4593 * and {@link #PERSISTENT_ALL_CACHES} 4594 */ 4595 public void setPersistentDrawingCache(int drawingCacheToKeep) { 4596 mPersistentDrawingCache = drawingCacheToKeep & PERSISTENT_ALL_CACHES; 4597 } 4598 4599 /** 4600 * Returns the basis of alignment during layout operations on this view group: 4601 * either {@link #CLIP_BOUNDS} or {@link #OPTICAL_BOUNDS}. 4602 * 4603 * @return the layout mode to use during layout operations 4604 * 4605 * @see #setLayoutMode(int) 4606 * 4607 * @hide 4608 */ 4609 public int getLayoutMode() { 4610 return mLayoutMode; 4611 } 4612 4613 /** 4614 * Sets the basis of alignment during the layout of this view group. 4615 * Valid values are either {@link #CLIP_BOUNDS} or {@link #OPTICAL_BOUNDS}. 4616 * <p> 4617 * The default is {@link #CLIP_BOUNDS}. 4618 * 4619 * @param layoutMode the layout mode to use during layout operations 4620 * 4621 * @see #getLayoutMode() 4622 * 4623 * @hide 4624 */ 4625 public void setLayoutMode(int layoutMode) { 4626 if (mLayoutMode != layoutMode) { 4627 mLayoutMode = layoutMode; 4628 requestLayout(); 4629 } 4630 } 4631 4632 /** 4633 * Returns a new set of layout parameters based on the supplied attributes set. 4634 * 4635 * @param attrs the attributes to build the layout parameters from 4636 * 4637 * @return an instance of {@link android.view.ViewGroup.LayoutParams} or one 4638 * of its descendants 4639 */ 4640 public LayoutParams generateLayoutParams(AttributeSet attrs) { 4641 return new LayoutParams(getContext(), attrs); 4642 } 4643 4644 /** 4645 * Returns a safe set of layout parameters based on the supplied layout params. 4646 * When a ViewGroup is passed a View whose layout params do not pass the test of 4647 * {@link #checkLayoutParams(android.view.ViewGroup.LayoutParams)}, this method 4648 * is invoked. This method should return a new set of layout params suitable for 4649 * this ViewGroup, possibly by copying the appropriate attributes from the 4650 * specified set of layout params. 4651 * 4652 * @param p The layout parameters to convert into a suitable set of layout parameters 4653 * for this ViewGroup. 4654 * 4655 * @return an instance of {@link android.view.ViewGroup.LayoutParams} or one 4656 * of its descendants 4657 */ 4658 protected LayoutParams generateLayoutParams(ViewGroup.LayoutParams p) { 4659 return p; 4660 } 4661 4662 /** 4663 * Returns a set of default layout parameters. These parameters are requested 4664 * when the View passed to {@link #addView(View)} has no layout parameters 4665 * already set. If null is returned, an exception is thrown from addView. 4666 * 4667 * @return a set of default layout parameters or null 4668 */ 4669 protected LayoutParams generateDefaultLayoutParams() { 4670 return new LayoutParams(LayoutParams.WRAP_CONTENT, LayoutParams.WRAP_CONTENT); 4671 } 4672 4673 /** 4674 * {@inheritDoc} 4675 */ 4676 @Override 4677 protected void debug(int depth) { 4678 super.debug(depth); 4679 String output; 4680 4681 if (mFocused != null) { 4682 output = debugIndent(depth); 4683 output += "mFocused"; 4684 Log.d(VIEW_LOG_TAG, output); 4685 } 4686 if (mChildrenCount != 0) { 4687 output = debugIndent(depth); 4688 output += "{"; 4689 Log.d(VIEW_LOG_TAG, output); 4690 } 4691 int count = mChildrenCount; 4692 for (int i = 0; i < count; i++) { 4693 View child = mChildren[i]; 4694 child.debug(depth + 1); 4695 } 4696 4697 if (mChildrenCount != 0) { 4698 output = debugIndent(depth); 4699 output += "}"; 4700 Log.d(VIEW_LOG_TAG, output); 4701 } 4702 } 4703 4704 /** 4705 * Returns the position in the group of the specified child view. 4706 * 4707 * @param child the view for which to get the position 4708 * @return a positive integer representing the position of the view in the 4709 * group, or -1 if the view does not exist in the group 4710 */ 4711 public int indexOfChild(View child) { 4712 final int count = mChildrenCount; 4713 final View[] children = mChildren; 4714 for (int i = 0; i < count; i++) { 4715 if (children[i] == child) { 4716 return i; 4717 } 4718 } 4719 return -1; 4720 } 4721 4722 /** 4723 * Returns the number of children in the group. 4724 * 4725 * @return a positive integer representing the number of children in 4726 * the group 4727 */ 4728 public int getChildCount() { 4729 return mChildrenCount; 4730 } 4731 4732 /** 4733 * Returns the view at the specified position in the group. 4734 * 4735 * @param index the position at which to get the view from 4736 * @return the view at the specified position or null if the position 4737 * does not exist within the group 4738 */ 4739 public View getChildAt(int index) { 4740 if (index < 0 || index >= mChildrenCount) { 4741 return null; 4742 } 4743 return mChildren[index]; 4744 } 4745 4746 /** 4747 * Ask all of the children of this view to measure themselves, taking into 4748 * account both the MeasureSpec requirements for this view and its padding. 4749 * We skip children that are in the GONE state The heavy lifting is done in 4750 * getChildMeasureSpec. 4751 * 4752 * @param widthMeasureSpec The width requirements for this view 4753 * @param heightMeasureSpec The height requirements for this view 4754 */ 4755 protected void measureChildren(int widthMeasureSpec, int heightMeasureSpec) { 4756 final int size = mChildrenCount; 4757 final View[] children = mChildren; 4758 for (int i = 0; i < size; ++i) { 4759 final View child = children[i]; 4760 if ((child.mViewFlags & VISIBILITY_MASK) != GONE) { 4761 measureChild(child, widthMeasureSpec, heightMeasureSpec); 4762 } 4763 } 4764 } 4765 4766 /** 4767 * Ask one of the children of this view to measure itself, taking into 4768 * account both the MeasureSpec requirements for this view and its padding. 4769 * The heavy lifting is done in getChildMeasureSpec. 4770 * 4771 * @param child The child to measure 4772 * @param parentWidthMeasureSpec The width requirements for this view 4773 * @param parentHeightMeasureSpec The height requirements for this view 4774 */ 4775 protected void measureChild(View child, int parentWidthMeasureSpec, 4776 int parentHeightMeasureSpec) { 4777 final LayoutParams lp = child.getLayoutParams(); 4778 4779 final int childWidthMeasureSpec = getChildMeasureSpec(parentWidthMeasureSpec, 4780 mPaddingLeft + mPaddingRight, lp.width); 4781 final int childHeightMeasureSpec = getChildMeasureSpec(parentHeightMeasureSpec, 4782 mPaddingTop + mPaddingBottom, lp.height); 4783 4784 child.measure(childWidthMeasureSpec, childHeightMeasureSpec); 4785 } 4786 4787 /** 4788 * Ask one of the children of this view to measure itself, taking into 4789 * account both the MeasureSpec requirements for this view and its padding 4790 * and margins. The child must have MarginLayoutParams The heavy lifting is 4791 * done in getChildMeasureSpec. 4792 * 4793 * @param child The child to measure 4794 * @param parentWidthMeasureSpec The width requirements for this view 4795 * @param widthUsed Extra space that has been used up by the parent 4796 * horizontally (possibly by other children of the parent) 4797 * @param parentHeightMeasureSpec The height requirements for this view 4798 * @param heightUsed Extra space that has been used up by the parent 4799 * vertically (possibly by other children of the parent) 4800 */ 4801 protected void measureChildWithMargins(View child, 4802 int parentWidthMeasureSpec, int widthUsed, 4803 int parentHeightMeasureSpec, int heightUsed) { 4804 final MarginLayoutParams lp = (MarginLayoutParams) child.getLayoutParams(); 4805 4806 final int childWidthMeasureSpec = getChildMeasureSpec(parentWidthMeasureSpec, 4807 mPaddingLeft + mPaddingRight + lp.leftMargin + lp.rightMargin 4808 + widthUsed, lp.width); 4809 final int childHeightMeasureSpec = getChildMeasureSpec(parentHeightMeasureSpec, 4810 mPaddingTop + mPaddingBottom + lp.topMargin + lp.bottomMargin 4811 + heightUsed, lp.height); 4812 4813 child.measure(childWidthMeasureSpec, childHeightMeasureSpec); 4814 } 4815 4816 /** 4817 * Does the hard part of measureChildren: figuring out the MeasureSpec to 4818 * pass to a particular child. This method figures out the right MeasureSpec 4819 * for one dimension (height or width) of one child view. 4820 * 4821 * The goal is to combine information from our MeasureSpec with the 4822 * LayoutParams of the child to get the best possible results. For example, 4823 * if the this view knows its size (because its MeasureSpec has a mode of 4824 * EXACTLY), and the child has indicated in its LayoutParams that it wants 4825 * to be the same size as the parent, the parent should ask the child to 4826 * layout given an exact size. 4827 * 4828 * @param spec The requirements for this view 4829 * @param padding The padding of this view for the current dimension and 4830 * margins, if applicable 4831 * @param childDimension How big the child wants to be in the current 4832 * dimension 4833 * @return a MeasureSpec integer for the child 4834 */ 4835 public static int getChildMeasureSpec(int spec, int padding, int childDimension) { 4836 int specMode = MeasureSpec.getMode(spec); 4837 int specSize = MeasureSpec.getSize(spec); 4838 4839 int size = Math.max(0, specSize - padding); 4840 4841 int resultSize = 0; 4842 int resultMode = 0; 4843 4844 switch (specMode) { 4845 // Parent has imposed an exact size on us 4846 case MeasureSpec.EXACTLY: 4847 if (childDimension >= 0) { 4848 resultSize = childDimension; 4849 resultMode = MeasureSpec.EXACTLY; 4850 } else if (childDimension == LayoutParams.MATCH_PARENT) { 4851 // Child wants to be our size. So be it. 4852 resultSize = size; 4853 resultMode = MeasureSpec.EXACTLY; 4854 } else if (childDimension == LayoutParams.WRAP_CONTENT) { 4855 // Child wants to determine its own size. It can't be 4856 // bigger than us. 4857 resultSize = size; 4858 resultMode = MeasureSpec.AT_MOST; 4859 } 4860 break; 4861 4862 // Parent has imposed a maximum size on us 4863 case MeasureSpec.AT_MOST: 4864 if (childDimension >= 0) { 4865 // Child wants a specific size... so be it 4866 resultSize = childDimension; 4867 resultMode = MeasureSpec.EXACTLY; 4868 } else if (childDimension == LayoutParams.MATCH_PARENT) { 4869 // Child wants to be our size, but our size is not fixed. 4870 // Constrain child to not be bigger than us. 4871 resultSize = size; 4872 resultMode = MeasureSpec.AT_MOST; 4873 } else if (childDimension == LayoutParams.WRAP_CONTENT) { 4874 // Child wants to determine its own size. It can't be 4875 // bigger than us. 4876 resultSize = size; 4877 resultMode = MeasureSpec.AT_MOST; 4878 } 4879 break; 4880 4881 // Parent asked to see how big we want to be 4882 case MeasureSpec.UNSPECIFIED: 4883 if (childDimension >= 0) { 4884 // Child wants a specific size... let him have it 4885 resultSize = childDimension; 4886 resultMode = MeasureSpec.EXACTLY; 4887 } else if (childDimension == LayoutParams.MATCH_PARENT) { 4888 // Child wants to be our size... find out how big it should 4889 // be 4890 resultSize = 0; 4891 resultMode = MeasureSpec.UNSPECIFIED; 4892 } else if (childDimension == LayoutParams.WRAP_CONTENT) { 4893 // Child wants to determine its own size.... find out how 4894 // big it should be 4895 resultSize = 0; 4896 resultMode = MeasureSpec.UNSPECIFIED; 4897 } 4898 break; 4899 } 4900 return MeasureSpec.makeMeasureSpec(resultSize, resultMode); 4901 } 4902 4903 4904 /** 4905 * Removes any pending animations for views that have been removed. Call 4906 * this if you don't want animations for exiting views to stack up. 4907 */ 4908 public void clearDisappearingChildren() { 4909 if (mDisappearingChildren != null) { 4910 mDisappearingChildren.clear(); 4911 invalidate(); 4912 } 4913 } 4914 4915 /** 4916 * Add a view which is removed from mChildren but still needs animation 4917 * 4918 * @param v View to add 4919 */ 4920 private void addDisappearingView(View v) { 4921 ArrayList<View> disappearingChildren = mDisappearingChildren; 4922 4923 if (disappearingChildren == null) { 4924 disappearingChildren = mDisappearingChildren = new ArrayList<View>(); 4925 } 4926 4927 disappearingChildren.add(v); 4928 } 4929 4930 /** 4931 * Cleanup a view when its animation is done. This may mean removing it from 4932 * the list of disappearing views. 4933 * 4934 * @param view The view whose animation has finished 4935 * @param animation The animation, cannot be null 4936 */ 4937 void finishAnimatingView(final View view, Animation animation) { 4938 final ArrayList<View> disappearingChildren = mDisappearingChildren; 4939 if (disappearingChildren != null) { 4940 if (disappearingChildren.contains(view)) { 4941 disappearingChildren.remove(view); 4942 4943 if (view.mAttachInfo != null) { 4944 view.dispatchDetachedFromWindow(); 4945 } 4946 4947 view.clearAnimation(); 4948 mGroupFlags |= FLAG_INVALIDATE_REQUIRED; 4949 } 4950 } 4951 4952 if (animation != null && !animation.getFillAfter()) { 4953 view.clearAnimation(); 4954 } 4955 4956 if ((view.mPrivateFlags & ANIMATION_STARTED) == ANIMATION_STARTED) { 4957 view.onAnimationEnd(); 4958 // Should be performed by onAnimationEnd() but this avoid an infinite loop, 4959 // so we'd rather be safe than sorry 4960 view.mPrivateFlags &= ~ANIMATION_STARTED; 4961 // Draw one more frame after the animation is done 4962 mGroupFlags |= FLAG_INVALIDATE_REQUIRED; 4963 } 4964 } 4965 4966 /** 4967 * Utility function called by View during invalidation to determine whether a view that 4968 * is invisible or gone should still be invalidated because it is being transitioned (and 4969 * therefore still needs to be drawn). 4970 */ 4971 boolean isViewTransitioning(View view) { 4972 return (mTransitioningViews != null && mTransitioningViews.contains(view)); 4973 } 4974 4975 /** 4976 * This method tells the ViewGroup that the given View object, which should have this 4977 * ViewGroup as its parent, 4978 * should be kept around (re-displayed when the ViewGroup draws its children) even if it 4979 * is removed from its parent. This allows animations, such as those used by 4980 * {@link android.app.Fragment} and {@link android.animation.LayoutTransition} to animate 4981 * the removal of views. A call to this method should always be accompanied by a later call 4982 * to {@link #endViewTransition(View)}, such as after an animation on the View has finished, 4983 * so that the View finally gets removed. 4984 * 4985 * @param view The View object to be kept visible even if it gets removed from its parent. 4986 */ 4987 public void startViewTransition(View view) { 4988 if (view.mParent == this) { 4989 if (mTransitioningViews == null) { 4990 mTransitioningViews = new ArrayList<View>(); 4991 } 4992 mTransitioningViews.add(view); 4993 } 4994 } 4995 4996 /** 4997 * This method should always be called following an earlier call to 4998 * {@link #startViewTransition(View)}. The given View is finally removed from its parent 4999 * and will no longer be displayed. Note that this method does not perform the functionality 5000 * of removing a view from its parent; it just discontinues the display of a View that 5001 * has previously been removed. 5002 * 5003 * @return view The View object that has been removed but is being kept around in the visible 5004 * hierarchy by an earlier call to {@link #startViewTransition(View)}. 5005 */ 5006 public void endViewTransition(View view) { 5007 if (mTransitioningViews != null) { 5008 mTransitioningViews.remove(view); 5009 final ArrayList<View> disappearingChildren = mDisappearingChildren; 5010 if (disappearingChildren != null && disappearingChildren.contains(view)) { 5011 disappearingChildren.remove(view); 5012 if (mVisibilityChangingChildren != null && 5013 mVisibilityChangingChildren.contains(view)) { 5014 mVisibilityChangingChildren.remove(view); 5015 } else { 5016 if (view.mAttachInfo != null) { 5017 view.dispatchDetachedFromWindow(); 5018 } 5019 if (view.mParent != null) { 5020 view.mParent = null; 5021 } 5022 } 5023 invalidate(); 5024 } 5025 } 5026 } 5027 5028 private LayoutTransition.TransitionListener mLayoutTransitionListener = 5029 new LayoutTransition.TransitionListener() { 5030 @Override 5031 public void startTransition(LayoutTransition transition, ViewGroup container, 5032 View view, int transitionType) { 5033 // We only care about disappearing items, since we need special logic to keep 5034 // those items visible after they've been 'removed' 5035 if (transitionType == LayoutTransition.DISAPPEARING) { 5036 startViewTransition(view); 5037 } 5038 } 5039 5040 @Override 5041 public void endTransition(LayoutTransition transition, ViewGroup container, 5042 View view, int transitionType) { 5043 if (mLayoutSuppressed && !transition.isChangingLayout()) { 5044 requestLayout(); 5045 mLayoutSuppressed = false; 5046 } 5047 if (transitionType == LayoutTransition.DISAPPEARING && mTransitioningViews != null) { 5048 endViewTransition(view); 5049 } 5050 } 5051 }; 5052 5053 /** 5054 * {@inheritDoc} 5055 */ 5056 @Override 5057 public boolean gatherTransparentRegion(Region region) { 5058 // If no transparent regions requested, we are always opaque. 5059 final boolean meOpaque = (mPrivateFlags & View.REQUEST_TRANSPARENT_REGIONS) == 0; 5060 if (meOpaque && region == null) { 5061 // The caller doesn't care about the region, so stop now. 5062 return true; 5063 } 5064 super.gatherTransparentRegion(region); 5065 final View[] children = mChildren; 5066 final int count = mChildrenCount; 5067 boolean noneOfTheChildrenAreTransparent = true; 5068 for (int i = 0; i < count; i++) { 5069 final View child = children[i]; 5070 if ((child.mViewFlags & VISIBILITY_MASK) == VISIBLE || child.getAnimation() != null) { 5071 if (!child.gatherTransparentRegion(region)) { 5072 noneOfTheChildrenAreTransparent = false; 5073 } 5074 } 5075 } 5076 return meOpaque || noneOfTheChildrenAreTransparent; 5077 } 5078 5079 /** 5080 * {@inheritDoc} 5081 */ 5082 public void requestTransparentRegion(View child) { 5083 if (child != null) { 5084 child.mPrivateFlags |= View.REQUEST_TRANSPARENT_REGIONS; 5085 if (mParent != null) { 5086 mParent.requestTransparentRegion(this); 5087 } 5088 } 5089 } 5090 5091 5092 @Override 5093 protected boolean fitSystemWindows(Rect insets) { 5094 boolean done = super.fitSystemWindows(insets); 5095 if (!done) { 5096 final int count = mChildrenCount; 5097 final View[] children = mChildren; 5098 for (int i = 0; i < count; i++) { 5099 done = children[i].fitSystemWindows(insets); 5100 if (done) { 5101 break; 5102 } 5103 } 5104 } 5105 return done; 5106 } 5107 5108 /** 5109 * Returns the animation listener to which layout animation events are 5110 * sent. 5111 * 5112 * @return an {@link android.view.animation.Animation.AnimationListener} 5113 */ 5114 public Animation.AnimationListener getLayoutAnimationListener() { 5115 return mAnimationListener; 5116 } 5117 5118 @Override 5119 protected void drawableStateChanged() { 5120 super.drawableStateChanged(); 5121 5122 if ((mGroupFlags & FLAG_NOTIFY_CHILDREN_ON_DRAWABLE_STATE_CHANGE) != 0) { 5123 if ((mGroupFlags & FLAG_ADD_STATES_FROM_CHILDREN) != 0) { 5124 throw new IllegalStateException("addStateFromChildren cannot be enabled if a" 5125 + " child has duplicateParentState set to true"); 5126 } 5127 5128 final View[] children = mChildren; 5129 final int count = mChildrenCount; 5130 5131 for (int i = 0; i < count; i++) { 5132 final View child = children[i]; 5133 if ((child.mViewFlags & DUPLICATE_PARENT_STATE) != 0) { 5134 child.refreshDrawableState(); 5135 } 5136 } 5137 } 5138 } 5139 5140 @Override 5141 public void jumpDrawablesToCurrentState() { 5142 super.jumpDrawablesToCurrentState(); 5143 final View[] children = mChildren; 5144 final int count = mChildrenCount; 5145 for (int i = 0; i < count; i++) { 5146 children[i].jumpDrawablesToCurrentState(); 5147 } 5148 } 5149 5150 @Override 5151 protected int[] onCreateDrawableState(int extraSpace) { 5152 if ((mGroupFlags & FLAG_ADD_STATES_FROM_CHILDREN) == 0) { 5153 return super.onCreateDrawableState(extraSpace); 5154 } 5155 5156 int need = 0; 5157 int n = getChildCount(); 5158 for (int i = 0; i < n; i++) { 5159 int[] childState = getChildAt(i).getDrawableState(); 5160 5161 if (childState != null) { 5162 need += childState.length; 5163 } 5164 } 5165 5166 int[] state = super.onCreateDrawableState(extraSpace + need); 5167 5168 for (int i = 0; i < n; i++) { 5169 int[] childState = getChildAt(i).getDrawableState(); 5170 5171 if (childState != null) { 5172 state = mergeDrawableStates(state, childState); 5173 } 5174 } 5175 5176 return state; 5177 } 5178 5179 /** 5180 * Sets whether this ViewGroup's drawable states also include 5181 * its children's drawable states. This is used, for example, to 5182 * make a group appear to be focused when its child EditText or button 5183 * is focused. 5184 */ 5185 public void setAddStatesFromChildren(boolean addsStates) { 5186 if (addsStates) { 5187 mGroupFlags |= FLAG_ADD_STATES_FROM_CHILDREN; 5188 } else { 5189 mGroupFlags &= ~FLAG_ADD_STATES_FROM_CHILDREN; 5190 } 5191 5192 refreshDrawableState(); 5193 } 5194 5195 /** 5196 * Returns whether this ViewGroup's drawable states also include 5197 * its children's drawable states. This is used, for example, to 5198 * make a group appear to be focused when its child EditText or button 5199 * is focused. 5200 */ 5201 public boolean addStatesFromChildren() { 5202 return (mGroupFlags & FLAG_ADD_STATES_FROM_CHILDREN) != 0; 5203 } 5204 5205 /** 5206 * If {link #addStatesFromChildren} is true, refreshes this group's 5207 * drawable state (to include the states from its children). 5208 */ 5209 public void childDrawableStateChanged(View child) { 5210 if ((mGroupFlags & FLAG_ADD_STATES_FROM_CHILDREN) != 0) { 5211 refreshDrawableState(); 5212 } 5213 } 5214 5215 /** 5216 * Specifies the animation listener to which layout animation events must 5217 * be sent. Only 5218 * {@link android.view.animation.Animation.AnimationListener#onAnimationStart(Animation)} 5219 * and 5220 * {@link android.view.animation.Animation.AnimationListener#onAnimationEnd(Animation)} 5221 * are invoked. 5222 * 5223 * @param animationListener the layout animation listener 5224 */ 5225 public void setLayoutAnimationListener(Animation.AnimationListener animationListener) { 5226 mAnimationListener = animationListener; 5227 } 5228 5229 /** 5230 * This method is called by LayoutTransition when there are 'changing' animations that need 5231 * to start after the layout/setup phase. The request is forwarded to the ViewAncestor, who 5232 * starts all pending transitions prior to the drawing phase in the current traversal. 5233 * 5234 * @param transition The LayoutTransition to be started on the next traversal. 5235 * 5236 * @hide 5237 */ 5238 public void requestTransitionStart(LayoutTransition transition) { 5239 ViewRootImpl viewAncestor = getViewRootImpl(); 5240 if (viewAncestor != null) { 5241 viewAncestor.requestTransitionStart(transition); 5242 } 5243 } 5244 5245 @Override 5246 public void onResolvedLayoutDirectionReset() { 5247 // Take care of resetting the children resolution too 5248 final int count = getChildCount(); 5249 for (int i = 0; i < count; i++) { 5250 final View child = getChildAt(i); 5251 if (child.getLayoutDirection() == LAYOUT_DIRECTION_INHERIT) { 5252 child.resetResolvedLayoutDirection(); 5253 } 5254 } 5255 } 5256 5257 @Override 5258 public void onResolvedTextDirectionReset() { 5259 // Take care of resetting the children resolution too 5260 final int count = getChildCount(); 5261 for (int i = 0; i < count; i++) { 5262 final View child = getChildAt(i); 5263 if (child.getTextDirection() == TEXT_DIRECTION_INHERIT) { 5264 child.resetResolvedTextDirection(); 5265 } 5266 } 5267 } 5268 5269 @Override 5270 public void onResolvedTextAlignmentReset() { 5271 // Take care of resetting the children resolution too 5272 final int count = getChildCount(); 5273 for (int i = 0; i < count; i++) { 5274 final View child = getChildAt(i); 5275 if (child.getTextAlignment() == TEXT_ALIGNMENT_INHERIT) { 5276 child.resetResolvedTextAlignment(); 5277 } 5278 } 5279 } 5280 5281 /** 5282 * Return true if the pressed state should be delayed for children or descendants of this 5283 * ViewGroup. Generally, this should be done for containers that can scroll, such as a List. 5284 * This prevents the pressed state from appearing when the user is actually trying to scroll 5285 * the content. 5286 * 5287 * The default implementation returns true for compatibility reasons. Subclasses that do 5288 * not scroll should generally override this method and return false. 5289 */ 5290 public boolean shouldDelayChildPressedState() { 5291 return true; 5292 } 5293 5294 /** @hide */ 5295 protected void onSetLayoutParams(View child, LayoutParams layoutParams) { 5296 } 5297 5298 /** 5299 * LayoutParams are used by views to tell their parents how they want to be 5300 * laid out. See 5301 * {@link android.R.styleable#ViewGroup_Layout ViewGroup Layout Attributes} 5302 * for a list of all child view attributes that this class supports. 5303 * 5304 * <p> 5305 * The base LayoutParams class just describes how big the view wants to be 5306 * for both width and height. For each dimension, it can specify one of: 5307 * <ul> 5308 * <li>FILL_PARENT (renamed MATCH_PARENT in API Level 8 and higher), which 5309 * means that the view wants to be as big as its parent (minus padding) 5310 * <li> WRAP_CONTENT, which means that the view wants to be just big enough 5311 * to enclose its content (plus padding) 5312 * <li> an exact number 5313 * </ul> 5314 * There are subclasses of LayoutParams for different subclasses of 5315 * ViewGroup. For example, AbsoluteLayout has its own subclass of 5316 * LayoutParams which adds an X and Y value.</p> 5317 * 5318 * <div class="special reference"> 5319 * <h3>Developer Guides</h3> 5320 * <p>For more information about creating user interface layouts, read the 5321 * <a href="{@docRoot}guide/topics/ui/declaring-layout.html">XML Layouts</a> developer 5322 * guide.</p></div> 5323 * 5324 * @attr ref android.R.styleable#ViewGroup_Layout_layout_height 5325 * @attr ref android.R.styleable#ViewGroup_Layout_layout_width 5326 */ 5327 public static class LayoutParams { 5328 /** 5329 * Special value for the height or width requested by a View. 5330 * FILL_PARENT means that the view wants to be as big as its parent, 5331 * minus the parent's padding, if any. This value is deprecated 5332 * starting in API Level 8 and replaced by {@link #MATCH_PARENT}. 5333 */ 5334 @SuppressWarnings({"UnusedDeclaration"}) 5335 @Deprecated 5336 public static final int FILL_PARENT = -1; 5337 5338 /** 5339 * Special value for the height or width requested by a View. 5340 * MATCH_PARENT means that the view wants to be as big as its parent, 5341 * minus the parent's padding, if any. Introduced in API Level 8. 5342 */ 5343 public static final int MATCH_PARENT = -1; 5344 5345 /** 5346 * Special value for the height or width requested by a View. 5347 * WRAP_CONTENT means that the view wants to be just large enough to fit 5348 * its own internal content, taking its own padding into account. 5349 */ 5350 public static final int WRAP_CONTENT = -2; 5351 5352 /** 5353 * Information about how wide the view wants to be. Can be one of the 5354 * constants FILL_PARENT (replaced by MATCH_PARENT , 5355 * in API Level 8) or WRAP_CONTENT. or an exact size. 5356 */ 5357 @ViewDebug.ExportedProperty(category = "layout", mapping = { 5358 @ViewDebug.IntToString(from = MATCH_PARENT, to = "MATCH_PARENT"), 5359 @ViewDebug.IntToString(from = WRAP_CONTENT, to = "WRAP_CONTENT") 5360 }) 5361 public int width; 5362 5363 /** 5364 * Information about how tall the view wants to be. Can be one of the 5365 * constants FILL_PARENT (replaced by MATCH_PARENT , 5366 * in API Level 8) or WRAP_CONTENT. or an exact size. 5367 */ 5368 @ViewDebug.ExportedProperty(category = "layout", mapping = { 5369 @ViewDebug.IntToString(from = MATCH_PARENT, to = "MATCH_PARENT"), 5370 @ViewDebug.IntToString(from = WRAP_CONTENT, to = "WRAP_CONTENT") 5371 }) 5372 public int height; 5373 5374 /** 5375 * Used to animate layouts. 5376 */ 5377 public LayoutAnimationController.AnimationParameters layoutAnimationParameters; 5378 5379 /** 5380 * Creates a new set of layout parameters. The values are extracted from 5381 * the supplied attributes set and context. The XML attributes mapped 5382 * to this set of layout parameters are: 5383 * 5384 * <ul> 5385 * <li><code>layout_width</code>: the width, either an exact value, 5386 * {@link #WRAP_CONTENT}, or {@link #FILL_PARENT} (replaced by 5387 * {@link #MATCH_PARENT} in API Level 8)</li> 5388 * <li><code>layout_height</code>: the height, either an exact value, 5389 * {@link #WRAP_CONTENT}, or {@link #FILL_PARENT} (replaced by 5390 * {@link #MATCH_PARENT} in API Level 8)</li> 5391 * </ul> 5392 * 5393 * @param c the application environment 5394 * @param attrs the set of attributes from which to extract the layout 5395 * parameters' values 5396 */ 5397 public LayoutParams(Context c, AttributeSet attrs) { 5398 TypedArray a = c.obtainStyledAttributes(attrs, R.styleable.ViewGroup_Layout); 5399 setBaseAttributes(a, 5400 R.styleable.ViewGroup_Layout_layout_width, 5401 R.styleable.ViewGroup_Layout_layout_height); 5402 a.recycle(); 5403 } 5404 5405 /** 5406 * Creates a new set of layout parameters with the specified width 5407 * and height. 5408 * 5409 * @param width the width, either {@link #WRAP_CONTENT}, 5410 * {@link #FILL_PARENT} (replaced by {@link #MATCH_PARENT} in 5411 * API Level 8), or a fixed size in pixels 5412 * @param height the height, either {@link #WRAP_CONTENT}, 5413 * {@link #FILL_PARENT} (replaced by {@link #MATCH_PARENT} in 5414 * API Level 8), or a fixed size in pixels 5415 */ 5416 public LayoutParams(int width, int height) { 5417 this.width = width; 5418 this.height = height; 5419 } 5420 5421 /** 5422 * Copy constructor. Clones the width and height values of the source. 5423 * 5424 * @param source The layout params to copy from. 5425 */ 5426 public LayoutParams(LayoutParams source) { 5427 this.width = source.width; 5428 this.height = source.height; 5429 } 5430 5431 /** 5432 * Used internally by MarginLayoutParams. 5433 * @hide 5434 */ 5435 LayoutParams() { 5436 } 5437 5438 /** 5439 * Extracts the <code>width</code> and <code>height</code> layout parameters 5440 * from the supplied TypedArray, <code>a</code>, and assigns them 5441 * to the appropriate fields. If, <code>a</code>, does not contain an 5442 * entry for either attribute, the value, {@link ViewGroup.LayoutParams#WRAP_CONTENT}, 5443 * is used as a default. 5444 * 5445 * @param a the style attributes to extract the parameters from 5446 * @param widthAttr the identifier of the width attribute 5447 * @param heightAttr the identifier of the height attribute 5448 */ 5449 protected void setBaseAttributes(TypedArray a, int widthAttr, int heightAttr) { 5450 width = a.getLayoutDimension(widthAttr, WRAP_CONTENT); 5451 height = a.getLayoutDimension(heightAttr, WRAP_CONTENT); 5452 } 5453 5454 /** 5455 * Resolve layout parameters depending on the layout direction. Subclasses that care about 5456 * layoutDirection changes should override this method. The default implementation does 5457 * nothing. 5458 * 5459 * @param layoutDirection the direction of the layout 5460 * 5461 * {@link View#LAYOUT_DIRECTION_LTR} 5462 * {@link View#LAYOUT_DIRECTION_RTL} 5463 */ 5464 public void onResolveLayoutDirection(int layoutDirection) { 5465 } 5466 5467 /** 5468 * Returns a String representation of this set of layout parameters. 5469 * 5470 * @param output the String to prepend to the internal representation 5471 * @return a String with the following format: output + 5472 * "ViewGroup.LayoutParams={ width=WIDTH, height=HEIGHT }" 5473 * 5474 * @hide 5475 */ 5476 public String debug(String output) { 5477 return output + "ViewGroup.LayoutParams={ width=" 5478 + sizeToString(width) + ", height=" + sizeToString(height) + " }"; 5479 } 5480 5481 /** 5482 * Use {@code canvas} to draw suitable debugging annotations for these LayoutParameters. 5483 * 5484 * @param view the view that contains these layout parameters 5485 * @param canvas the canvas on which to draw 5486 * 5487 * @hide 5488 */ 5489 public void onDebugDraw(View view, Canvas canvas) { 5490 } 5491 5492 /** 5493 * Converts the specified size to a readable String. 5494 * 5495 * @param size the size to convert 5496 * @return a String instance representing the supplied size 5497 * 5498 * @hide 5499 */ 5500 protected static String sizeToString(int size) { 5501 if (size == WRAP_CONTENT) { 5502 return "wrap-content"; 5503 } 5504 if (size == MATCH_PARENT) { 5505 return "match-parent"; 5506 } 5507 return String.valueOf(size); 5508 } 5509 } 5510 5511 /** 5512 * Per-child layout information for layouts that support margins. 5513 * See 5514 * {@link android.R.styleable#ViewGroup_MarginLayout ViewGroup Margin Layout Attributes} 5515 * for a list of all child view attributes that this class supports. 5516 */ 5517 public static class MarginLayoutParams extends ViewGroup.LayoutParams { 5518 /** 5519 * The left margin in pixels of the child. 5520 * Call {@link ViewGroup#setLayoutParams(LayoutParams)} after reassigning a new value 5521 * to this field. 5522 */ 5523 @ViewDebug.ExportedProperty(category = "layout") 5524 public int leftMargin; 5525 5526 /** 5527 * The top margin in pixels of the child. 5528 * Call {@link ViewGroup#setLayoutParams(LayoutParams)} after reassigning a new value 5529 * to this field. 5530 */ 5531 @ViewDebug.ExportedProperty(category = "layout") 5532 public int topMargin; 5533 5534 /** 5535 * The right margin in pixels of the child. 5536 * Call {@link ViewGroup#setLayoutParams(LayoutParams)} after reassigning a new value 5537 * to this field. 5538 */ 5539 @ViewDebug.ExportedProperty(category = "layout") 5540 public int rightMargin; 5541 5542 /** 5543 * The bottom margin in pixels of the child. 5544 * Call {@link ViewGroup#setLayoutParams(LayoutParams)} after reassigning a new value 5545 * to this field. 5546 */ 5547 @ViewDebug.ExportedProperty(category = "layout") 5548 public int bottomMargin; 5549 5550 /** 5551 * The start margin in pixels of the child. 5552 * Call {@link ViewGroup#setLayoutParams(LayoutParams)} after reassigning a new value 5553 * to this field. 5554 */ 5555 @ViewDebug.ExportedProperty(category = "layout") 5556 public int startMargin = DEFAULT_RELATIVE; 5557 5558 /** 5559 * The end margin in pixels of the child. 5560 * Call {@link ViewGroup#setLayoutParams(LayoutParams)} after reassigning a new value 5561 * to this field. 5562 */ 5563 @ViewDebug.ExportedProperty(category = "layout") 5564 public int endMargin = DEFAULT_RELATIVE; 5565 5566 /** 5567 * The default start and end margin. 5568 */ 5569 static private final int DEFAULT_RELATIVE = Integer.MIN_VALUE; 5570 5571 /** 5572 * Creates a new set of layout parameters. The values are extracted from 5573 * the supplied attributes set and context. 5574 * 5575 * @param c the application environment 5576 * @param attrs the set of attributes from which to extract the layout 5577 * parameters' values 5578 */ 5579 public MarginLayoutParams(Context c, AttributeSet attrs) { 5580 super(); 5581 5582 TypedArray a = c.obtainStyledAttributes(attrs, R.styleable.ViewGroup_MarginLayout); 5583 setBaseAttributes(a, 5584 R.styleable.ViewGroup_MarginLayout_layout_width, 5585 R.styleable.ViewGroup_MarginLayout_layout_height); 5586 5587 int margin = a.getDimensionPixelSize( 5588 com.android.internal.R.styleable.ViewGroup_MarginLayout_layout_margin, -1); 5589 if (margin >= 0) { 5590 leftMargin = margin; 5591 topMargin = margin; 5592 rightMargin= margin; 5593 bottomMargin = margin; 5594 } else { 5595 leftMargin = a.getDimensionPixelSize( 5596 R.styleable.ViewGroup_MarginLayout_layout_marginLeft, 0); 5597 topMargin = a.getDimensionPixelSize( 5598 R.styleable.ViewGroup_MarginLayout_layout_marginTop, 0); 5599 rightMargin = a.getDimensionPixelSize( 5600 R.styleable.ViewGroup_MarginLayout_layout_marginRight, 0); 5601 bottomMargin = a.getDimensionPixelSize( 5602 R.styleable.ViewGroup_MarginLayout_layout_marginBottom, 0); 5603 startMargin = a.getDimensionPixelSize( 5604 R.styleable.ViewGroup_MarginLayout_layout_marginStart, DEFAULT_RELATIVE); 5605 endMargin = a.getDimensionPixelSize( 5606 R.styleable.ViewGroup_MarginLayout_layout_marginEnd, DEFAULT_RELATIVE); 5607 } 5608 5609 a.recycle(); 5610 } 5611 5612 /** 5613 * {@inheritDoc} 5614 */ 5615 public MarginLayoutParams(int width, int height) { 5616 super(width, height); 5617 } 5618 5619 /** 5620 * Copy constructor. Clones the width, height and margin values of the source. 5621 * 5622 * @param source The layout params to copy from. 5623 */ 5624 public MarginLayoutParams(MarginLayoutParams source) { 5625 this.width = source.width; 5626 this.height = source.height; 5627 5628 this.leftMargin = source.leftMargin; 5629 this.topMargin = source.topMargin; 5630 this.rightMargin = source.rightMargin; 5631 this.bottomMargin = source.bottomMargin; 5632 this.startMargin = source.startMargin; 5633 this.endMargin = source.endMargin; 5634 } 5635 5636 /** 5637 * {@inheritDoc} 5638 */ 5639 public MarginLayoutParams(LayoutParams source) { 5640 super(source); 5641 } 5642 5643 /** 5644 * Sets the margins, in pixels. A call to {@link android.view.View#requestLayout()} needs 5645 * to be done so that the new margins are taken into account. Left and right margins may be 5646 * overriden by {@link android.view.View#requestLayout()} depending on layout direction. 5647 * 5648 * @param left the left margin size 5649 * @param top the top margin size 5650 * @param right the right margin size 5651 * @param bottom the bottom margin size 5652 * 5653 * @attr ref android.R.styleable#ViewGroup_MarginLayout_layout_marginLeft 5654 * @attr ref android.R.styleable#ViewGroup_MarginLayout_layout_marginTop 5655 * @attr ref android.R.styleable#ViewGroup_MarginLayout_layout_marginRight 5656 * @attr ref android.R.styleable#ViewGroup_MarginLayout_layout_marginBottom 5657 */ 5658 public void setMargins(int left, int top, int right, int bottom) { 5659 leftMargin = left; 5660 topMargin = top; 5661 rightMargin = right; 5662 bottomMargin = bottom; 5663 } 5664 5665 /** 5666 * Sets the relative margins, in pixels. A call to {@link android.view.View#requestLayout()} 5667 * needs to be done so that the new relative margins are taken into account. Left and right 5668 * margins may be overriden by {@link android.view.View#requestLayout()} depending on layout 5669 * direction. 5670 * 5671 * @param start the start margin size 5672 * @param top the top margin size 5673 * @param end the right margin size 5674 * @param bottom the bottom margin size 5675 * 5676 * @attr ref android.R.styleable#ViewGroup_MarginLayout_layout_marginStart 5677 * @attr ref android.R.styleable#ViewGroup_MarginLayout_layout_marginTop 5678 * @attr ref android.R.styleable#ViewGroup_MarginLayout_layout_marginEnd 5679 * @attr ref android.R.styleable#ViewGroup_MarginLayout_layout_marginBottom 5680 * 5681 * @hide 5682 */ 5683 public void setMarginsRelative(int start, int top, int end, int bottom) { 5684 startMargin = start; 5685 topMargin = top; 5686 endMargin = end; 5687 bottomMargin = bottom; 5688 } 5689 5690 /** 5691 * Returns the start margin in pixels. 5692 * 5693 * @attr ref android.R.styleable#ViewGroup_MarginLayout_layout_marginStart 5694 * 5695 * @return the start margin in pixels. 5696 */ 5697 public int getMarginStart() { 5698 return startMargin; 5699 } 5700 5701 /** 5702 * Returns the end margin in pixels. 5703 * 5704 * @attr ref android.R.styleable#ViewGroup_MarginLayout_layout_marginEnd 5705 * 5706 * @return the end margin in pixels. 5707 */ 5708 public int getMarginEnd() { 5709 return endMargin; 5710 } 5711 5712 /** 5713 * Check if margins are relative. 5714 * 5715 * @attr ref android.R.styleable#ViewGroup_MarginLayout_layout_marginStart 5716 * @attr ref android.R.styleable#ViewGroup_MarginLayout_layout_marginEnd 5717 * 5718 * @return true if either marginStart or marginEnd has been set 5719 */ 5720 public boolean isMarginRelative() { 5721 return (startMargin != DEFAULT_RELATIVE) || (endMargin != DEFAULT_RELATIVE); 5722 } 5723 5724 /** 5725 * This will be called by {@link android.view.View#requestLayout()}. Left and Right margins 5726 * may be overridden depending on layout direction. 5727 */ 5728 @Override 5729 public void onResolveLayoutDirection(int layoutDirection) { 5730 switch(layoutDirection) { 5731 case View.LAYOUT_DIRECTION_RTL: 5732 leftMargin = (endMargin > DEFAULT_RELATIVE) ? endMargin : leftMargin; 5733 rightMargin = (startMargin > DEFAULT_RELATIVE) ? startMargin : rightMargin; 5734 break; 5735 case View.LAYOUT_DIRECTION_LTR: 5736 default: 5737 leftMargin = (startMargin > DEFAULT_RELATIVE) ? startMargin : leftMargin; 5738 rightMargin = (endMargin > DEFAULT_RELATIVE) ? endMargin : rightMargin; 5739 break; 5740 } 5741 } 5742 5743 /** 5744 * @hide 5745 */ 5746 @Override 5747 public void onDebugDraw(View view, Canvas canvas) { 5748 drawRect(canvas, 5749 view.getLeft() - leftMargin, 5750 view.getTop() - topMargin, 5751 view.getRight() + rightMargin, 5752 view.getBottom() + bottomMargin, Color.MAGENTA); 5753 } 5754 } 5755 5756 /* Describes a touched view and the ids of the pointers that it has captured. 5757 * 5758 * This code assumes that pointer ids are always in the range 0..31 such that 5759 * it can use a bitfield to track which pointer ids are present. 5760 * As it happens, the lower layers of the input dispatch pipeline also use the 5761 * same trick so the assumption should be safe here... 5762 */ 5763 private static final class TouchTarget { 5764 private static final int MAX_RECYCLED = 32; 5765 private static final Object sRecycleLock = new Object(); 5766 private static TouchTarget sRecycleBin; 5767 private static int sRecycledCount; 5768 5769 public static final int ALL_POINTER_IDS = -1; // all ones 5770 5771 // The touched child view. 5772 public View child; 5773 5774 // The combined bit mask of pointer ids for all pointers captured by the target. 5775 public int pointerIdBits; 5776 5777 // The next target in the target list. 5778 public TouchTarget next; 5779 5780 private TouchTarget() { 5781 } 5782 5783 public static TouchTarget obtain(View child, int pointerIdBits) { 5784 final TouchTarget target; 5785 synchronized (sRecycleLock) { 5786 if (sRecycleBin == null) { 5787 target = new TouchTarget(); 5788 } else { 5789 target = sRecycleBin; 5790 sRecycleBin = target.next; 5791 sRecycledCount--; 5792 target.next = null; 5793 } 5794 } 5795 target.child = child; 5796 target.pointerIdBits = pointerIdBits; 5797 return target; 5798 } 5799 5800 public void recycle() { 5801 synchronized (sRecycleLock) { 5802 if (sRecycledCount < MAX_RECYCLED) { 5803 next = sRecycleBin; 5804 sRecycleBin = this; 5805 sRecycledCount += 1; 5806 } else { 5807 next = null; 5808 } 5809 child = null; 5810 } 5811 } 5812 } 5813 5814 /* Describes a hovered view. */ 5815 private static final class HoverTarget { 5816 private static final int MAX_RECYCLED = 32; 5817 private static final Object sRecycleLock = new Object(); 5818 private static HoverTarget sRecycleBin; 5819 private static int sRecycledCount; 5820 5821 // The hovered child view. 5822 public View child; 5823 5824 // The next target in the target list. 5825 public HoverTarget next; 5826 5827 private HoverTarget() { 5828 } 5829 5830 public static HoverTarget obtain(View child) { 5831 final HoverTarget target; 5832 synchronized (sRecycleLock) { 5833 if (sRecycleBin == null) { 5834 target = new HoverTarget(); 5835 } else { 5836 target = sRecycleBin; 5837 sRecycleBin = target.next; 5838 sRecycledCount--; 5839 target.next = null; 5840 } 5841 } 5842 target.child = child; 5843 return target; 5844 } 5845 5846 public void recycle() { 5847 synchronized (sRecycleLock) { 5848 if (sRecycledCount < MAX_RECYCLED) { 5849 next = sRecycleBin; 5850 sRecycleBin = this; 5851 sRecycledCount += 1; 5852 } else { 5853 next = null; 5854 } 5855 child = null; 5856 } 5857 } 5858 } 5859 5860 /** 5861 * Pooled class that orderes the children of a ViewGroup from start 5862 * to end based on how they are laid out and the layout direction. 5863 */ 5864 static class ChildListForAccessibility { 5865 5866 private static final int MAX_POOL_SIZE = 32; 5867 5868 private static final Object sPoolLock = new Object(); 5869 5870 private static ChildListForAccessibility sPool; 5871 5872 private static int sPoolSize; 5873 5874 private boolean mIsPooled; 5875 5876 private ChildListForAccessibility mNext; 5877 5878 private final ArrayList<View> mChildren = new ArrayList<View>(); 5879 5880 private final ArrayList<ViewLocationHolder> mHolders = new ArrayList<ViewLocationHolder>(); 5881 5882 public static ChildListForAccessibility obtain(ViewGroup parent, boolean sort) { 5883 ChildListForAccessibility list = null; 5884 synchronized (sPoolLock) { 5885 if (sPool != null) { 5886 list = sPool; 5887 sPool = list.mNext; 5888 list.mNext = null; 5889 list.mIsPooled = false; 5890 sPoolSize--; 5891 } else { 5892 list = new ChildListForAccessibility(); 5893 } 5894 list.init(parent, sort); 5895 return list; 5896 } 5897 } 5898 5899 public void recycle() { 5900 if (mIsPooled) { 5901 throw new IllegalStateException("Instance already recycled."); 5902 } 5903 clear(); 5904 synchronized (sPoolLock) { 5905 if (sPoolSize < MAX_POOL_SIZE) { 5906 mNext = sPool; 5907 mIsPooled = true; 5908 sPool = this; 5909 sPoolSize++; 5910 } 5911 } 5912 } 5913 5914 public int getChildCount() { 5915 return mChildren.size(); 5916 } 5917 5918 public View getChildAt(int index) { 5919 return mChildren.get(index); 5920 } 5921 5922 public int getChildIndex(View child) { 5923 return mChildren.indexOf(child); 5924 } 5925 5926 private void init(ViewGroup parent, boolean sort) { 5927 ArrayList<View> children = mChildren; 5928 final int childCount = parent.getChildCount(); 5929 for (int i = 0; i < childCount; i++) { 5930 View child = parent.getChildAt(i); 5931 children.add(child); 5932 } 5933 if (sort) { 5934 ArrayList<ViewLocationHolder> holders = mHolders; 5935 for (int i = 0; i < childCount; i++) { 5936 View child = children.get(i); 5937 ViewLocationHolder holder = ViewLocationHolder.obtain(parent, child); 5938 holders.add(holder); 5939 } 5940 Collections.sort(holders); 5941 for (int i = 0; i < childCount; i++) { 5942 ViewLocationHolder holder = holders.get(i); 5943 children.set(i, holder.mView); 5944 holder.recycle(); 5945 } 5946 holders.clear(); 5947 } 5948 } 5949 5950 private void clear() { 5951 mChildren.clear(); 5952 } 5953 } 5954 5955 /** 5956 * Pooled class that holds a View and its location with respect to 5957 * a specified root. This enables sorting of views based on their 5958 * coordinates without recomputing the position relative to the root 5959 * on every comparison. 5960 */ 5961 static class ViewLocationHolder implements Comparable<ViewLocationHolder> { 5962 5963 private static final int MAX_POOL_SIZE = 32; 5964 5965 private static final Object sPoolLock = new Object(); 5966 5967 private static ViewLocationHolder sPool; 5968 5969 private static int sPoolSize; 5970 5971 private boolean mIsPooled; 5972 5973 private ViewLocationHolder mNext; 5974 5975 private final Rect mLocation = new Rect(); 5976 5977 public View mView; 5978 5979 private int mLayoutDirection; 5980 5981 public static ViewLocationHolder obtain(ViewGroup root, View view) { 5982 ViewLocationHolder holder = null; 5983 synchronized (sPoolLock) { 5984 if (sPool != null) { 5985 holder = sPool; 5986 sPool = holder.mNext; 5987 holder.mNext = null; 5988 holder.mIsPooled = false; 5989 sPoolSize--; 5990 } else { 5991 holder = new ViewLocationHolder(); 5992 } 5993 holder.init(root, view); 5994 return holder; 5995 } 5996 } 5997 5998 public void recycle() { 5999 if (mIsPooled) { 6000 throw new IllegalStateException("Instance already recycled."); 6001 } 6002 clear(); 6003 synchronized (sPoolLock) { 6004 if (sPoolSize < MAX_POOL_SIZE) { 6005 mNext = sPool; 6006 mIsPooled = true; 6007 sPool = this; 6008 sPoolSize++; 6009 } 6010 } 6011 } 6012 6013 @Override 6014 public int compareTo(ViewLocationHolder another) { 6015 // This instance is greater than an invalid argument. 6016 if (another == null) { 6017 return 1; 6018 } 6019 if (getClass() != another.getClass()) { 6020 return 1; 6021 } 6022 // First is above second. 6023 if (mLocation.bottom - another.mLocation.top <= 0) { 6024 return -1; 6025 } 6026 // First is below second. 6027 if (mLocation.top - another.mLocation.bottom >= 0) { 6028 return 1; 6029 } 6030 // LTR 6031 if (mLayoutDirection == LAYOUT_DIRECTION_LTR) { 6032 final int leftDifference = mLocation.left - another.mLocation.left; 6033 // First more to the left than second. 6034 if (leftDifference != 0) { 6035 return leftDifference; 6036 } 6037 } else { // RTL 6038 final int rightDifference = mLocation.right - another.mLocation.right; 6039 // First more to the right than second. 6040 if (rightDifference != 0) { 6041 return -rightDifference; 6042 } 6043 } 6044 // Break tie by top. 6045 final int topDiference = mLocation.top - another.mLocation.top; 6046 if (topDiference != 0) { 6047 return topDiference; 6048 } 6049 // Break tie by height. 6050 final int heightDiference = mLocation.height() - another.mLocation.height(); 6051 if (heightDiference != 0) { 6052 return -heightDiference; 6053 } 6054 // Break tie by width. 6055 final int widthDiference = mLocation.width() - another.mLocation.width(); 6056 if (widthDiference != 0) { 6057 return -widthDiference; 6058 } 6059 // Just break the tie somehow. The accessibliity ids are unique 6060 // and stable, hence this is deterministic tie breaking. 6061 return mView.getAccessibilityViewId() - another.mView.getAccessibilityViewId(); 6062 } 6063 6064 private void init(ViewGroup root, View view) { 6065 Rect viewLocation = mLocation; 6066 view.getDrawingRect(viewLocation); 6067 root.offsetDescendantRectToMyCoords(view, viewLocation); 6068 mView = view; 6069 mLayoutDirection = root.getResolvedLayoutDirection(); 6070 } 6071 6072 private void clear() { 6073 mView = null; 6074 mLocation.set(0, 0, 0, 0); 6075 } 6076 } 6077 6078 private static Paint getDebugPaint() { 6079 if (sDebugPaint == null) { 6080 sDebugPaint = new Paint(); 6081 sDebugPaint.setAntiAlias(false); 6082 } 6083 return sDebugPaint; 6084 } 6085 6086 private static float[] getDebugLines(int x1, int y1, int x2, int y2) { 6087 if (sDebugLines== null) { 6088 sDebugLines = new float[16]; 6089 } 6090 6091 x2--; 6092 y2--; 6093 6094 sDebugLines[0] = x1; 6095 sDebugLines[1] = y1; 6096 sDebugLines[2] = x2; 6097 sDebugLines[3] = y1; 6098 6099 sDebugLines[4] = x2; 6100 sDebugLines[5] = y1; 6101 sDebugLines[6] = x2; 6102 sDebugLines[7] = y2 + 1; 6103 6104 sDebugLines[8] = x2 + 1; 6105 sDebugLines[9] = y2; 6106 sDebugLines[10] = x1; 6107 sDebugLines[11] = y2; 6108 6109 sDebugLines[12] = x1; 6110 sDebugLines[13] = y2; 6111 sDebugLines[14] = x1; 6112 sDebugLines[15] = y1; 6113 6114 return sDebugLines; 6115 } 6116} 6117