ViewGroup.java revision 2440e670de0294bdf64592849613db9b8f00ee11
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 @ViewDebug.ExportedProperty(flagMapping = { 174 @ViewDebug.FlagToString(mask = FLAG_CLIP_CHILDREN, equals = FLAG_CLIP_CHILDREN, 175 name = "CLIP_CHILDREN"), 176 @ViewDebug.FlagToString(mask = FLAG_CLIP_TO_PADDING, equals = FLAG_CLIP_TO_PADDING, 177 name = "CLIP_TO_PADDING"), 178 @ViewDebug.FlagToString(mask = FLAG_PADDING_NOT_NULL, equals = FLAG_PADDING_NOT_NULL, 179 name = "PADDING_NOT_NULL") 180 }) 181 protected int mGroupFlags; 182 183 /* 184 * The layout mode: either {@link #CLIP_BOUNDS} or {@link #OPTICAL_BOUNDS} 185 */ 186 private int mLayoutMode = CLIP_BOUNDS; 187 188 /** 189 * NOTE: If you change the flags below make sure to reflect the changes 190 * the DisplayList class 191 */ 192 193 // When set, ViewGroup invalidates only the child's rectangle 194 // Set by default 195 static final int FLAG_CLIP_CHILDREN = 0x1; 196 197 // When set, ViewGroup excludes the padding area from the invalidate rectangle 198 // Set by default 199 private static final int FLAG_CLIP_TO_PADDING = 0x2; 200 201 // When set, dispatchDraw() will invoke invalidate(); this is set by drawChild() when 202 // a child needs to be invalidated and FLAG_OPTIMIZE_INVALIDATE is set 203 static final int FLAG_INVALIDATE_REQUIRED = 0x4; 204 205 // When set, dispatchDraw() will run the layout animation and unset the flag 206 private static final int FLAG_RUN_ANIMATION = 0x8; 207 208 // When set, there is either no layout animation on the ViewGroup or the layout 209 // animation is over 210 // Set by default 211 static final int FLAG_ANIMATION_DONE = 0x10; 212 213 // If set, this ViewGroup has padding; if unset there is no padding and we don't need 214 // to clip it, even if FLAG_CLIP_TO_PADDING is set 215 private static final int FLAG_PADDING_NOT_NULL = 0x20; 216 217 // When set, this ViewGroup caches its children in a Bitmap before starting a layout animation 218 // Set by default 219 private static final int FLAG_ANIMATION_CACHE = 0x40; 220 221 // When set, this ViewGroup converts calls to invalidate(Rect) to invalidate() during a 222 // layout animation; this avoid clobbering the hierarchy 223 // Automatically set when the layout animation starts, depending on the animation's 224 // characteristics 225 static final int FLAG_OPTIMIZE_INVALIDATE = 0x80; 226 227 // When set, the next call to drawChild() will clear mChildTransformation's matrix 228 static final int FLAG_CLEAR_TRANSFORMATION = 0x100; 229 230 // When set, this ViewGroup invokes mAnimationListener.onAnimationEnd() and removes 231 // the children's Bitmap caches if necessary 232 // This flag is set when the layout animation is over (after FLAG_ANIMATION_DONE is set) 233 private static final int FLAG_NOTIFY_ANIMATION_LISTENER = 0x200; 234 235 /** 236 * When set, the drawing method will call {@link #getChildDrawingOrder(int, int)} 237 * to get the index of the child to draw for that iteration. 238 * 239 * @hide 240 */ 241 protected static final int FLAG_USE_CHILD_DRAWING_ORDER = 0x400; 242 243 /** 244 * When set, this ViewGroup supports static transformations on children; this causes 245 * {@link #getChildStaticTransformation(View, android.view.animation.Transformation)} to be 246 * invoked when a child is drawn. 247 * 248 * Any subclass overriding 249 * {@link #getChildStaticTransformation(View, android.view.animation.Transformation)} should 250 * set this flags in {@link #mGroupFlags}. 251 * 252 * {@hide} 253 */ 254 protected static final int FLAG_SUPPORT_STATIC_TRANSFORMATIONS = 0x800; 255 256 // When the previous drawChild() invocation used an alpha value that was lower than 257 // 1.0 and set it in mCachePaint 258 static final int FLAG_ALPHA_LOWER_THAN_ONE = 0x1000; 259 260 /** 261 * When set, this ViewGroup's drawable states also include those 262 * of its children. 263 */ 264 private static final int FLAG_ADD_STATES_FROM_CHILDREN = 0x2000; 265 266 /** 267 * When set, this ViewGroup tries to always draw its children using their drawing cache. 268 */ 269 static final int FLAG_ALWAYS_DRAWN_WITH_CACHE = 0x4000; 270 271 /** 272 * When set, and if FLAG_ALWAYS_DRAWN_WITH_CACHE is not set, this ViewGroup will try to 273 * draw its children with their drawing cache. 274 */ 275 static final int FLAG_CHILDREN_DRAWN_WITH_CACHE = 0x8000; 276 277 /** 278 * When set, this group will go through its list of children to notify them of 279 * any drawable state change. 280 */ 281 private static final int FLAG_NOTIFY_CHILDREN_ON_DRAWABLE_STATE_CHANGE = 0x10000; 282 283 private static final int FLAG_MASK_FOCUSABILITY = 0x60000; 284 285 /** 286 * This view will get focus before any of its descendants. 287 */ 288 public static final int FOCUS_BEFORE_DESCENDANTS = 0x20000; 289 290 /** 291 * This view will get focus only if none of its descendants want it. 292 */ 293 public static final int FOCUS_AFTER_DESCENDANTS = 0x40000; 294 295 /** 296 * This view will block any of its descendants from getting focus, even 297 * if they are focusable. 298 */ 299 public static final int FOCUS_BLOCK_DESCENDANTS = 0x60000; 300 301 /** 302 * Used to map between enum in attrubutes and flag values. 303 */ 304 private static final int[] DESCENDANT_FOCUSABILITY_FLAGS = 305 {FOCUS_BEFORE_DESCENDANTS, FOCUS_AFTER_DESCENDANTS, 306 FOCUS_BLOCK_DESCENDANTS}; 307 308 /** 309 * When set, this ViewGroup should not intercept touch events. 310 * {@hide} 311 */ 312 protected static final int FLAG_DISALLOW_INTERCEPT = 0x80000; 313 314 /** 315 * When set, this ViewGroup will split MotionEvents to multiple child Views when appropriate. 316 */ 317 private static final int FLAG_SPLIT_MOTION_EVENTS = 0x200000; 318 319 /** 320 * When set, this ViewGroup will not dispatch onAttachedToWindow calls 321 * to children when adding new views. This is used to prevent multiple 322 * onAttached calls when a ViewGroup adds children in its own onAttached method. 323 */ 324 private static final int FLAG_PREVENT_DISPATCH_ATTACHED_TO_WINDOW = 0x400000; 325 326 /** 327 * Indicates which types of drawing caches are to be kept in memory. 328 * This field should be made private, so it is hidden from the SDK. 329 * {@hide} 330 */ 331 protected int mPersistentDrawingCache; 332 333 /** 334 * Used to indicate that no drawing cache should be kept in memory. 335 */ 336 public static final int PERSISTENT_NO_CACHE = 0x0; 337 338 /** 339 * Used to indicate that the animation drawing cache should be kept in memory. 340 */ 341 public static final int PERSISTENT_ANIMATION_CACHE = 0x1; 342 343 /** 344 * Used to indicate that the scrolling drawing cache should be kept in memory. 345 */ 346 public static final int PERSISTENT_SCROLLING_CACHE = 0x2; 347 348 /** 349 * Used to indicate that all drawing caches should be kept in memory. 350 */ 351 public static final int PERSISTENT_ALL_CACHES = 0x3; 352 353 // Layout Modes 354 355 /** 356 * This constant is a {@link #setLayoutMode(int) layoutMode}. 357 * Clip bounds are the raw values of {@link #getLeft() left}, {@link #getTop() top}, 358 * {@link #getRight() right} and {@link #getBottom() bottom}. 359 * 360 * @hide 361 */ 362 public static final int CLIP_BOUNDS = 0; 363 364 /** 365 * This constant is a {@link #setLayoutMode(int) layoutMode}. 366 * Optical bounds describe where a widget appears to be. They sit inside the clip 367 * bounds which need to cover a larger area to allow other effects, 368 * such as shadows and glows, to be drawn. 369 * 370 * @hide 371 */ 372 public static final int OPTICAL_BOUNDS = 1; 373 374 /** 375 * We clip to padding when FLAG_CLIP_TO_PADDING and FLAG_PADDING_NOT_NULL 376 * are set at the same time. 377 */ 378 protected static final int CLIP_TO_PADDING_MASK = FLAG_CLIP_TO_PADDING | FLAG_PADDING_NOT_NULL; 379 380 // Index of the child's left position in the mLocation array 381 private static final int CHILD_LEFT_INDEX = 0; 382 // Index of the child's top position in the mLocation array 383 private static final int CHILD_TOP_INDEX = 1; 384 385 // Child views of this ViewGroup 386 private View[] mChildren; 387 // Number of valid children in the mChildren array, the rest should be null or not 388 // considered as children 389 390 private boolean mLayoutSuppressed = false; 391 392 private int mChildrenCount; 393 394 private static final int ARRAY_INITIAL_CAPACITY = 12; 395 private static final int ARRAY_CAPACITY_INCREMENT = 12; 396 397 private static Paint sDebugPaint; 398 private static float[] sDebugLines; 399 400 // Used to draw cached views 401 Paint mCachePaint; 402 403 // Used to animate add/remove changes in layout 404 private LayoutTransition mTransition; 405 406 // The set of views that are currently being transitioned. This list is used to track views 407 // being removed that should not actually be removed from the parent yet because they are 408 // being animated. 409 private ArrayList<View> mTransitioningViews; 410 411 // List of children changing visibility. This is used to potentially keep rendering 412 // views during a transition when they otherwise would have become gone/invisible 413 private ArrayList<View> mVisibilityChangingChildren; 414 415 // Indicates how many of this container's child subtrees contain transient state 416 @ViewDebug.ExportedProperty(category = "layout") 417 private int mChildCountWithTransientState = 0; 418 419 public ViewGroup(Context context) { 420 super(context); 421 initViewGroup(); 422 } 423 424 public ViewGroup(Context context, AttributeSet attrs) { 425 super(context, attrs); 426 initViewGroup(); 427 initFromAttributes(context, attrs); 428 } 429 430 public ViewGroup(Context context, AttributeSet attrs, int defStyle) { 431 super(context, attrs, defStyle); 432 initViewGroup(); 433 initFromAttributes(context, attrs); 434 } 435 436 private boolean debugDraw() { 437 return mAttachInfo != null && mAttachInfo.mDebugLayout; 438 } 439 440 private void initViewGroup() { 441 // ViewGroup doesn't draw by default 442 if (!debugDraw()) { 443 setFlags(WILL_NOT_DRAW, DRAW_MASK); 444 } 445 mGroupFlags |= FLAG_CLIP_CHILDREN; 446 mGroupFlags |= FLAG_CLIP_TO_PADDING; 447 mGroupFlags |= FLAG_ANIMATION_DONE; 448 mGroupFlags |= FLAG_ANIMATION_CACHE; 449 mGroupFlags |= FLAG_ALWAYS_DRAWN_WITH_CACHE; 450 451 if (mContext.getApplicationInfo().targetSdkVersion >= Build.VERSION_CODES.HONEYCOMB) { 452 mGroupFlags |= FLAG_SPLIT_MOTION_EVENTS; 453 } 454 455 setDescendantFocusability(FOCUS_BEFORE_DESCENDANTS); 456 457 mChildren = new View[ARRAY_INITIAL_CAPACITY]; 458 mChildrenCount = 0; 459 460 mPersistentDrawingCache = PERSISTENT_SCROLLING_CACHE; 461 } 462 463 private void initFromAttributes(Context context, AttributeSet attrs) { 464 TypedArray a = context.obtainStyledAttributes(attrs, 465 R.styleable.ViewGroup); 466 467 final int N = a.getIndexCount(); 468 for (int i = 0; i < N; i++) { 469 int attr = a.getIndex(i); 470 switch (attr) { 471 case R.styleable.ViewGroup_clipChildren: 472 setClipChildren(a.getBoolean(attr, true)); 473 break; 474 case R.styleable.ViewGroup_clipToPadding: 475 setClipToPadding(a.getBoolean(attr, true)); 476 break; 477 case R.styleable.ViewGroup_animationCache: 478 setAnimationCacheEnabled(a.getBoolean(attr, true)); 479 break; 480 case R.styleable.ViewGroup_persistentDrawingCache: 481 setPersistentDrawingCache(a.getInt(attr, PERSISTENT_SCROLLING_CACHE)); 482 break; 483 case R.styleable.ViewGroup_addStatesFromChildren: 484 setAddStatesFromChildren(a.getBoolean(attr, false)); 485 break; 486 case R.styleable.ViewGroup_alwaysDrawnWithCache: 487 setAlwaysDrawnWithCacheEnabled(a.getBoolean(attr, true)); 488 break; 489 case R.styleable.ViewGroup_layoutAnimation: 490 int id = a.getResourceId(attr, -1); 491 if (id > 0) { 492 setLayoutAnimation(AnimationUtils.loadLayoutAnimation(mContext, id)); 493 } 494 break; 495 case R.styleable.ViewGroup_descendantFocusability: 496 setDescendantFocusability(DESCENDANT_FOCUSABILITY_FLAGS[a.getInt(attr, 0)]); 497 break; 498 case R.styleable.ViewGroup_splitMotionEvents: 499 setMotionEventSplittingEnabled(a.getBoolean(attr, false)); 500 break; 501 case R.styleable.ViewGroup_animateLayoutChanges: 502 boolean animateLayoutChanges = a.getBoolean(attr, false); 503 if (animateLayoutChanges) { 504 setLayoutTransition(new LayoutTransition()); 505 } 506 break; 507 } 508 } 509 510 a.recycle(); 511 } 512 513 /** 514 * Gets the descendant focusability of this view group. The descendant 515 * focusability defines the relationship between this view group and its 516 * descendants when looking for a view to take focus in 517 * {@link #requestFocus(int, android.graphics.Rect)}. 518 * 519 * @return one of {@link #FOCUS_BEFORE_DESCENDANTS}, {@link #FOCUS_AFTER_DESCENDANTS}, 520 * {@link #FOCUS_BLOCK_DESCENDANTS}. 521 */ 522 @ViewDebug.ExportedProperty(category = "focus", mapping = { 523 @ViewDebug.IntToString(from = FOCUS_BEFORE_DESCENDANTS, to = "FOCUS_BEFORE_DESCENDANTS"), 524 @ViewDebug.IntToString(from = FOCUS_AFTER_DESCENDANTS, to = "FOCUS_AFTER_DESCENDANTS"), 525 @ViewDebug.IntToString(from = FOCUS_BLOCK_DESCENDANTS, to = "FOCUS_BLOCK_DESCENDANTS") 526 }) 527 public int getDescendantFocusability() { 528 return mGroupFlags & FLAG_MASK_FOCUSABILITY; 529 } 530 531 /** 532 * Set the descendant focusability of this view group. This defines the relationship 533 * between this view group and its descendants when looking for a view to 534 * take focus in {@link #requestFocus(int, android.graphics.Rect)}. 535 * 536 * @param focusability one of {@link #FOCUS_BEFORE_DESCENDANTS}, {@link #FOCUS_AFTER_DESCENDANTS}, 537 * {@link #FOCUS_BLOCK_DESCENDANTS}. 538 */ 539 public void setDescendantFocusability(int focusability) { 540 switch (focusability) { 541 case FOCUS_BEFORE_DESCENDANTS: 542 case FOCUS_AFTER_DESCENDANTS: 543 case FOCUS_BLOCK_DESCENDANTS: 544 break; 545 default: 546 throw new IllegalArgumentException("must be one of FOCUS_BEFORE_DESCENDANTS, " 547 + "FOCUS_AFTER_DESCENDANTS, FOCUS_BLOCK_DESCENDANTS"); 548 } 549 mGroupFlags &= ~FLAG_MASK_FOCUSABILITY; 550 mGroupFlags |= (focusability & FLAG_MASK_FOCUSABILITY); 551 } 552 553 /** 554 * {@inheritDoc} 555 */ 556 @Override 557 void handleFocusGainInternal(int direction, Rect previouslyFocusedRect) { 558 if (mFocused != null) { 559 mFocused.unFocus(); 560 mFocused = null; 561 } 562 super.handleFocusGainInternal(direction, previouslyFocusedRect); 563 } 564 565 /** 566 * {@inheritDoc} 567 */ 568 public void requestChildFocus(View child, View focused) { 569 if (DBG) { 570 System.out.println(this + " requestChildFocus()"); 571 } 572 if (getDescendantFocusability() == FOCUS_BLOCK_DESCENDANTS) { 573 return; 574 } 575 576 // Unfocus us, if necessary 577 super.unFocus(); 578 579 // We had a previous notion of who had focus. Clear it. 580 if (mFocused != child) { 581 if (mFocused != null) { 582 mFocused.unFocus(); 583 } 584 585 mFocused = child; 586 } 587 if (mParent != null) { 588 mParent.requestChildFocus(this, focused); 589 } 590 } 591 592 /** 593 * {@inheritDoc} 594 */ 595 public void focusableViewAvailable(View v) { 596 if (mParent != null 597 // shortcut: don't report a new focusable view if we block our descendants from 598 // getting focus 599 && (getDescendantFocusability() != FOCUS_BLOCK_DESCENDANTS) 600 // shortcut: don't report a new focusable view if we already are focused 601 // (and we don't prefer our descendants) 602 // 603 // note: knowing that mFocused is non-null is not a good enough reason 604 // to break the traversal since in that case we'd actually have to find 605 // the focused view and make sure it wasn't FOCUS_AFTER_DESCENDANTS and 606 // an ancestor of v; this will get checked for at ViewAncestor 607 && !(isFocused() && getDescendantFocusability() != FOCUS_AFTER_DESCENDANTS)) { 608 mParent.focusableViewAvailable(v); 609 } 610 } 611 612 /** 613 * {@inheritDoc} 614 */ 615 public boolean showContextMenuForChild(View originalView) { 616 return mParent != null && mParent.showContextMenuForChild(originalView); 617 } 618 619 /** 620 * {@inheritDoc} 621 */ 622 public ActionMode startActionModeForChild(View originalView, ActionMode.Callback callback) { 623 return mParent != null ? mParent.startActionModeForChild(originalView, callback) : null; 624 } 625 626 /** 627 * Find the nearest view in the specified direction that wants to take 628 * focus. 629 * 630 * @param focused The view that currently has focus 631 * @param direction One of FOCUS_UP, FOCUS_DOWN, FOCUS_LEFT, and 632 * FOCUS_RIGHT, or 0 for not applicable. 633 */ 634 public View focusSearch(View focused, int direction) { 635 if (isRootNamespace()) { 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 View focused = mFocused; 769 mFocused = null; 770 focused.clearFocus(); 771 } 772 } 773 774 /** 775 * {@inheritDoc} 776 */ 777 @Override 778 void unFocus() { 779 if (DBG) { 780 System.out.println(this + " unFocus()"); 781 } 782 if (mFocused == null) { 783 super.unFocus(); 784 } else { 785 mFocused.unFocus(); 786 mFocused = null; 787 } 788 } 789 790 /** 791 * Returns the focused child of this view, if any. The child may have focus 792 * or contain focus. 793 * 794 * @return the focused child or null. 795 */ 796 public View getFocusedChild() { 797 return mFocused; 798 } 799 800 /** 801 * Returns true if this view has or contains focus 802 * 803 * @return true if this view has or contains focus 804 */ 805 @Override 806 public boolean hasFocus() { 807 return (mPrivateFlags & FOCUSED) != 0 || mFocused != null; 808 } 809 810 /* 811 * (non-Javadoc) 812 * 813 * @see android.view.View#findFocus() 814 */ 815 @Override 816 public View findFocus() { 817 if (DBG) { 818 System.out.println("Find focus in " + this + ": flags=" 819 + isFocused() + ", child=" + mFocused); 820 } 821 822 if (isFocused()) { 823 return this; 824 } 825 826 if (mFocused != null) { 827 return mFocused.findFocus(); 828 } 829 return null; 830 } 831 832 /** 833 * {@inheritDoc} 834 */ 835 @Override 836 public boolean hasFocusable() { 837 if ((mViewFlags & VISIBILITY_MASK) != VISIBLE) { 838 return false; 839 } 840 841 if (isFocusable()) { 842 return true; 843 } 844 845 final int descendantFocusability = getDescendantFocusability(); 846 if (descendantFocusability != FOCUS_BLOCK_DESCENDANTS) { 847 final int count = mChildrenCount; 848 final View[] children = mChildren; 849 850 for (int i = 0; i < count; i++) { 851 final View child = children[i]; 852 if (child.hasFocusable()) { 853 return true; 854 } 855 } 856 } 857 858 return false; 859 } 860 861 /** 862 * {@inheritDoc} 863 */ 864 @Override 865 public void addFocusables(ArrayList<View> views, int direction, int focusableMode) { 866 final int focusableCount = views.size(); 867 868 final int descendantFocusability = getDescendantFocusability(); 869 870 if (descendantFocusability != FOCUS_BLOCK_DESCENDANTS) { 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 super.addFocusables(views, direction, focusableMode); 890 } 891 } 892 893 @Override 894 public void findViewsWithText(ArrayList<View> outViews, CharSequence text, int flags) { 895 super.findViewsWithText(outViews, text, flags); 896 final int childrenCount = mChildrenCount; 897 final View[] children = mChildren; 898 for (int i = 0; i < childrenCount; i++) { 899 View child = children[i]; 900 if ((child.mViewFlags & VISIBILITY_MASK) == VISIBLE 901 && (child.mPrivateFlags & IS_ROOT_NAMESPACE) == 0) { 902 child.findViewsWithText(outViews, text, flags); 903 } 904 } 905 } 906 907 @Override 908 View findViewByAccessibilityIdTraversal(int accessibilityId) { 909 View foundView = super.findViewByAccessibilityIdTraversal(accessibilityId); 910 if (foundView != null) { 911 return foundView; 912 } 913 final int childrenCount = mChildrenCount; 914 final View[] children = mChildren; 915 for (int i = 0; i < childrenCount; i++) { 916 View child = children[i]; 917 foundView = child.findViewByAccessibilityIdTraversal(accessibilityId); 918 if (foundView != null) { 919 return foundView; 920 } 921 } 922 return null; 923 } 924 925 /** 926 * {@inheritDoc} 927 */ 928 @Override 929 public void dispatchWindowFocusChanged(boolean hasFocus) { 930 super.dispatchWindowFocusChanged(hasFocus); 931 final int count = mChildrenCount; 932 final View[] children = mChildren; 933 for (int i = 0; i < count; i++) { 934 children[i].dispatchWindowFocusChanged(hasFocus); 935 } 936 } 937 938 /** 939 * {@inheritDoc} 940 */ 941 @Override 942 public void addTouchables(ArrayList<View> views) { 943 super.addTouchables(views); 944 945 final int count = mChildrenCount; 946 final View[] children = mChildren; 947 948 for (int i = 0; i < count; i++) { 949 final View child = children[i]; 950 if ((child.mViewFlags & VISIBILITY_MASK) == VISIBLE) { 951 child.addTouchables(views); 952 } 953 } 954 } 955 956 /** 957 * @hide 958 */ 959 @Override 960 public void makeOptionalFitsSystemWindows() { 961 super.makeOptionalFitsSystemWindows(); 962 final int count = mChildrenCount; 963 final View[] children = mChildren; 964 for (int i = 0; i < count; i++) { 965 children[i].makeOptionalFitsSystemWindows(); 966 } 967 } 968 969 /** 970 * {@inheritDoc} 971 */ 972 @Override 973 public void dispatchDisplayHint(int hint) { 974 super.dispatchDisplayHint(hint); 975 final int count = mChildrenCount; 976 final View[] children = mChildren; 977 for (int i = 0; i < count; i++) { 978 children[i].dispatchDisplayHint(hint); 979 } 980 } 981 982 /** 983 * Called when a view's visibility has changed. Notify the parent to take any appropriate 984 * action. 985 * 986 * @param child The view whose visibility has changed 987 * @param oldVisibility The previous visibility value (GONE, INVISIBLE, or VISIBLE). 988 * @param newVisibility The new visibility value (GONE, INVISIBLE, or VISIBLE). 989 * @hide 990 */ 991 protected void onChildVisibilityChanged(View child, int oldVisibility, int newVisibility) { 992 if (mTransition != null) { 993 if (newVisibility == VISIBLE) { 994 mTransition.showChild(this, child, oldVisibility); 995 } else { 996 mTransition.hideChild(this, child, newVisibility); 997 if (mTransitioningViews != null && mTransitioningViews.contains(child)) { 998 // Only track this on disappearing views - appearing views are already visible 999 // and don't need special handling during drawChild() 1000 if (mVisibilityChangingChildren == null) { 1001 mVisibilityChangingChildren = new ArrayList<View>(); 1002 } 1003 mVisibilityChangingChildren.add(child); 1004 addDisappearingView(child); 1005 } 1006 } 1007 } 1008 1009 // in all cases, for drags 1010 if (mCurrentDrag != null) { 1011 if (newVisibility == VISIBLE) { 1012 notifyChildOfDrag(child); 1013 } 1014 } 1015 } 1016 1017 /** 1018 * {@inheritDoc} 1019 */ 1020 @Override 1021 protected void dispatchVisibilityChanged(View changedView, int visibility) { 1022 super.dispatchVisibilityChanged(changedView, visibility); 1023 final int count = mChildrenCount; 1024 final View[] children = mChildren; 1025 for (int i = 0; i < count; i++) { 1026 children[i].dispatchVisibilityChanged(changedView, visibility); 1027 } 1028 } 1029 1030 /** 1031 * {@inheritDoc} 1032 */ 1033 @Override 1034 public void dispatchWindowVisibilityChanged(int visibility) { 1035 super.dispatchWindowVisibilityChanged(visibility); 1036 final int count = mChildrenCount; 1037 final View[] children = mChildren; 1038 for (int i = 0; i < count; i++) { 1039 children[i].dispatchWindowVisibilityChanged(visibility); 1040 } 1041 } 1042 1043 /** 1044 * {@inheritDoc} 1045 */ 1046 @Override 1047 public void dispatchConfigurationChanged(Configuration newConfig) { 1048 super.dispatchConfigurationChanged(newConfig); 1049 final int count = mChildrenCount; 1050 final View[] children = mChildren; 1051 for (int i = 0; i < count; i++) { 1052 children[i].dispatchConfigurationChanged(newConfig); 1053 } 1054 } 1055 1056 /** 1057 * {@inheritDoc} 1058 */ 1059 public void recomputeViewAttributes(View child) { 1060 if (mAttachInfo != null && !mAttachInfo.mRecomputeGlobalAttributes) { 1061 ViewParent parent = mParent; 1062 if (parent != null) parent.recomputeViewAttributes(this); 1063 } 1064 } 1065 1066 @Override 1067 void dispatchCollectViewAttributes(AttachInfo attachInfo, int visibility) { 1068 if ((visibility & VISIBILITY_MASK) == VISIBLE) { 1069 super.dispatchCollectViewAttributes(attachInfo, visibility); 1070 final int count = mChildrenCount; 1071 final View[] children = mChildren; 1072 for (int i = 0; i < count; i++) { 1073 final View child = children[i]; 1074 child.dispatchCollectViewAttributes(attachInfo, 1075 visibility | (child.mViewFlags&VISIBILITY_MASK)); 1076 } 1077 } 1078 } 1079 1080 /** 1081 * {@inheritDoc} 1082 */ 1083 public void bringChildToFront(View child) { 1084 int index = indexOfChild(child); 1085 if (index >= 0) { 1086 removeFromArray(index); 1087 addInArray(child, mChildrenCount); 1088 child.mParent = this; 1089 } 1090 } 1091 1092 /** 1093 * {@inheritDoc} 1094 */ 1095 // TODO: Write real docs 1096 @Override 1097 public boolean dispatchDragEvent(DragEvent event) { 1098 boolean retval = false; 1099 final float tx = event.mX; 1100 final float ty = event.mY; 1101 1102 ViewRootImpl root = getViewRootImpl(); 1103 1104 // Dispatch down the view hierarchy 1105 switch (event.mAction) { 1106 case DragEvent.ACTION_DRAG_STARTED: { 1107 // clear state to recalculate which views we drag over 1108 mCurrentDragView = null; 1109 1110 // Set up our tracking of drag-started notifications 1111 mCurrentDrag = DragEvent.obtain(event); 1112 if (mDragNotifiedChildren == null) { 1113 mDragNotifiedChildren = new HashSet<View>(); 1114 } else { 1115 mDragNotifiedChildren.clear(); 1116 } 1117 1118 // Now dispatch down to our children, caching the responses 1119 mChildAcceptsDrag = false; 1120 final int count = mChildrenCount; 1121 final View[] children = mChildren; 1122 for (int i = 0; i < count; i++) { 1123 final View child = children[i]; 1124 child.mPrivateFlags2 &= ~View.DRAG_MASK; 1125 if (child.getVisibility() == VISIBLE) { 1126 final boolean handled = notifyChildOfDrag(children[i]); 1127 if (handled) { 1128 mChildAcceptsDrag = true; 1129 } 1130 } 1131 } 1132 1133 // Return HANDLED if one of our children can accept the drag 1134 if (mChildAcceptsDrag) { 1135 retval = true; 1136 } 1137 } break; 1138 1139 case DragEvent.ACTION_DRAG_ENDED: { 1140 // Release the bookkeeping now that the drag lifecycle has ended 1141 if (mDragNotifiedChildren != null) { 1142 for (View child : mDragNotifiedChildren) { 1143 // If a child was notified about an ongoing drag, it's told that it's over 1144 child.dispatchDragEvent(event); 1145 child.mPrivateFlags2 &= ~View.DRAG_MASK; 1146 child.refreshDrawableState(); 1147 } 1148 1149 mDragNotifiedChildren.clear(); 1150 mCurrentDrag.recycle(); 1151 mCurrentDrag = null; 1152 } 1153 1154 // We consider drag-ended to have been handled if one of our children 1155 // had offered to handle the drag. 1156 if (mChildAcceptsDrag) { 1157 retval = true; 1158 } 1159 } break; 1160 1161 case DragEvent.ACTION_DRAG_LOCATION: { 1162 // Find the [possibly new] drag target 1163 final View target = findFrontmostDroppableChildAt(event.mX, event.mY, mLocalPoint); 1164 1165 // If we've changed apparent drag target, tell the view root which view 1166 // we're over now [for purposes of the eventual drag-recipient-changed 1167 // notifications to the framework] and tell the new target that the drag 1168 // has entered its bounds. The root will see setDragFocus() calls all 1169 // the way down to the final leaf view that is handling the LOCATION event 1170 // before reporting the new potential recipient to the framework. 1171 if (mCurrentDragView != target) { 1172 root.setDragFocus(target); 1173 1174 final int action = event.mAction; 1175 // If we've dragged off of a child view, send it the EXITED message 1176 if (mCurrentDragView != null) { 1177 final View view = mCurrentDragView; 1178 event.mAction = DragEvent.ACTION_DRAG_EXITED; 1179 view.dispatchDragEvent(event); 1180 view.mPrivateFlags2 &= ~View.DRAG_HOVERED; 1181 view.refreshDrawableState(); 1182 } 1183 mCurrentDragView = target; 1184 1185 // If we've dragged over a new child view, send it the ENTERED message 1186 if (target != null) { 1187 event.mAction = DragEvent.ACTION_DRAG_ENTERED; 1188 target.dispatchDragEvent(event); 1189 target.mPrivateFlags2 |= View.DRAG_HOVERED; 1190 target.refreshDrawableState(); 1191 } 1192 event.mAction = action; // restore the event's original state 1193 } 1194 1195 // Dispatch the actual drag location notice, localized into its coordinates 1196 if (target != null) { 1197 event.mX = mLocalPoint.x; 1198 event.mY = mLocalPoint.y; 1199 1200 retval = target.dispatchDragEvent(event); 1201 1202 event.mX = tx; 1203 event.mY = ty; 1204 } 1205 } break; 1206 1207 /* Entered / exited dispatch 1208 * 1209 * DRAG_ENTERED is not dispatched downwards from ViewGroup. The reason for this is 1210 * that we're about to get the corresponding LOCATION event, which we will use to 1211 * determine which of our children is the new target; at that point we will 1212 * push a DRAG_ENTERED down to the new target child [which may itself be a ViewGroup]. 1213 * 1214 * DRAG_EXITED *is* dispatched all the way down immediately: once we know the 1215 * drag has left this ViewGroup, we know by definition that every contained subview 1216 * is also no longer under the drag point. 1217 */ 1218 1219 case DragEvent.ACTION_DRAG_EXITED: { 1220 if (mCurrentDragView != null) { 1221 final View view = mCurrentDragView; 1222 view.dispatchDragEvent(event); 1223 view.mPrivateFlags2 &= ~View.DRAG_HOVERED; 1224 view.refreshDrawableState(); 1225 1226 mCurrentDragView = null; 1227 } 1228 } break; 1229 1230 case DragEvent.ACTION_DROP: { 1231 if (ViewDebug.DEBUG_DRAG) Log.d(View.VIEW_LOG_TAG, "Drop event: " + event); 1232 View target = findFrontmostDroppableChildAt(event.mX, event.mY, mLocalPoint); 1233 if (target != null) { 1234 if (ViewDebug.DEBUG_DRAG) Log.d(View.VIEW_LOG_TAG, " dispatch drop to " + target); 1235 event.mX = mLocalPoint.x; 1236 event.mY = mLocalPoint.y; 1237 retval = target.dispatchDragEvent(event); 1238 event.mX = tx; 1239 event.mY = ty; 1240 } else { 1241 if (ViewDebug.DEBUG_DRAG) { 1242 Log.d(View.VIEW_LOG_TAG, " not dropped on an accepting view"); 1243 } 1244 } 1245 } break; 1246 } 1247 1248 // If none of our children could handle the event, try here 1249 if (!retval) { 1250 // Call up to the View implementation that dispatches to installed listeners 1251 retval = super.dispatchDragEvent(event); 1252 } 1253 return retval; 1254 } 1255 1256 // Find the frontmost child view that lies under the given point, and calculate 1257 // the position within its own local coordinate system. 1258 View findFrontmostDroppableChildAt(float x, float y, PointF outLocalPoint) { 1259 final int count = mChildrenCount; 1260 final View[] children = mChildren; 1261 for (int i = count - 1; i >= 0; i--) { 1262 final View child = children[i]; 1263 if (!child.canAcceptDrag()) { 1264 continue; 1265 } 1266 1267 if (isTransformedTouchPointInView(x, y, child, outLocalPoint)) { 1268 return child; 1269 } 1270 } 1271 return null; 1272 } 1273 1274 boolean notifyChildOfDrag(View child) { 1275 if (ViewDebug.DEBUG_DRAG) { 1276 Log.d(View.VIEW_LOG_TAG, "Sending drag-started to view: " + child); 1277 } 1278 1279 boolean canAccept = false; 1280 if (! mDragNotifiedChildren.contains(child)) { 1281 mDragNotifiedChildren.add(child); 1282 canAccept = child.dispatchDragEvent(mCurrentDrag); 1283 if (canAccept && !child.canAcceptDrag()) { 1284 child.mPrivateFlags2 |= View.DRAG_CAN_ACCEPT; 1285 child.refreshDrawableState(); 1286 } 1287 } 1288 return canAccept; 1289 } 1290 1291 @Override 1292 public void dispatchWindowSystemUiVisiblityChanged(int visible) { 1293 super.dispatchWindowSystemUiVisiblityChanged(visible); 1294 1295 final int count = mChildrenCount; 1296 final View[] children = mChildren; 1297 for (int i=0; i <count; i++) { 1298 final View child = children[i]; 1299 child.dispatchWindowSystemUiVisiblityChanged(visible); 1300 } 1301 } 1302 1303 @Override 1304 public void dispatchSystemUiVisibilityChanged(int visible) { 1305 super.dispatchSystemUiVisibilityChanged(visible); 1306 1307 final int count = mChildrenCount; 1308 final View[] children = mChildren; 1309 for (int i=0; i <count; i++) { 1310 final View child = children[i]; 1311 child.dispatchSystemUiVisibilityChanged(visible); 1312 } 1313 } 1314 1315 @Override 1316 boolean updateLocalSystemUiVisibility(int localValue, int localChanges) { 1317 boolean changed = super.updateLocalSystemUiVisibility(localValue, localChanges); 1318 1319 final int count = mChildrenCount; 1320 final View[] children = mChildren; 1321 for (int i=0; i <count; i++) { 1322 final View child = children[i]; 1323 changed |= child.updateLocalSystemUiVisibility(localValue, localChanges); 1324 } 1325 return changed; 1326 } 1327 1328 /** 1329 * {@inheritDoc} 1330 */ 1331 @Override 1332 public boolean dispatchKeyEventPreIme(KeyEvent event) { 1333 if ((mPrivateFlags & (FOCUSED | HAS_BOUNDS)) == (FOCUSED | HAS_BOUNDS)) { 1334 return super.dispatchKeyEventPreIme(event); 1335 } else if (mFocused != null && (mFocused.mPrivateFlags & HAS_BOUNDS) == HAS_BOUNDS) { 1336 return mFocused.dispatchKeyEventPreIme(event); 1337 } 1338 return false; 1339 } 1340 1341 /** 1342 * {@inheritDoc} 1343 */ 1344 @Override 1345 public boolean dispatchKeyEvent(KeyEvent event) { 1346 if (mInputEventConsistencyVerifier != null) { 1347 mInputEventConsistencyVerifier.onKeyEvent(event, 1); 1348 } 1349 1350 if ((mPrivateFlags & (FOCUSED | HAS_BOUNDS)) == (FOCUSED | HAS_BOUNDS)) { 1351 if (super.dispatchKeyEvent(event)) { 1352 return true; 1353 } 1354 } else if (mFocused != null && (mFocused.mPrivateFlags & HAS_BOUNDS) == HAS_BOUNDS) { 1355 if (mFocused.dispatchKeyEvent(event)) { 1356 return true; 1357 } 1358 } 1359 1360 if (mInputEventConsistencyVerifier != null) { 1361 mInputEventConsistencyVerifier.onUnhandledEvent(event, 1); 1362 } 1363 return false; 1364 } 1365 1366 /** 1367 * {@inheritDoc} 1368 */ 1369 @Override 1370 public boolean dispatchKeyShortcutEvent(KeyEvent event) { 1371 if ((mPrivateFlags & (FOCUSED | HAS_BOUNDS)) == (FOCUSED | HAS_BOUNDS)) { 1372 return super.dispatchKeyShortcutEvent(event); 1373 } else if (mFocused != null && (mFocused.mPrivateFlags & HAS_BOUNDS) == HAS_BOUNDS) { 1374 return mFocused.dispatchKeyShortcutEvent(event); 1375 } 1376 return false; 1377 } 1378 1379 /** 1380 * {@inheritDoc} 1381 */ 1382 @Override 1383 public boolean dispatchTrackballEvent(MotionEvent event) { 1384 if (mInputEventConsistencyVerifier != null) { 1385 mInputEventConsistencyVerifier.onTrackballEvent(event, 1); 1386 } 1387 1388 if ((mPrivateFlags & (FOCUSED | HAS_BOUNDS)) == (FOCUSED | HAS_BOUNDS)) { 1389 if (super.dispatchTrackballEvent(event)) { 1390 return true; 1391 } 1392 } else if (mFocused != null && (mFocused.mPrivateFlags & HAS_BOUNDS) == HAS_BOUNDS) { 1393 if (mFocused.dispatchTrackballEvent(event)) { 1394 return true; 1395 } 1396 } 1397 1398 if (mInputEventConsistencyVerifier != null) { 1399 mInputEventConsistencyVerifier.onUnhandledEvent(event, 1); 1400 } 1401 return false; 1402 } 1403 1404 /** 1405 * {@inheritDoc} 1406 */ 1407 @SuppressWarnings({"ConstantConditions"}) 1408 @Override 1409 protected boolean dispatchHoverEvent(MotionEvent event) { 1410 final int action = event.getAction(); 1411 1412 // First check whether the view group wants to intercept the hover event. 1413 final boolean interceptHover = onInterceptHoverEvent(event); 1414 event.setAction(action); // restore action in case it was changed 1415 1416 MotionEvent eventNoHistory = event; 1417 boolean handled = false; 1418 1419 // Send events to the hovered children and build a new list of hover targets until 1420 // one is found that handles the event. 1421 HoverTarget firstOldHoverTarget = mFirstHoverTarget; 1422 mFirstHoverTarget = null; 1423 if (!interceptHover && action != MotionEvent.ACTION_HOVER_EXIT) { 1424 final float x = event.getX(); 1425 final float y = event.getY(); 1426 final int childrenCount = mChildrenCount; 1427 if (childrenCount != 0) { 1428 final View[] children = mChildren; 1429 HoverTarget lastHoverTarget = null; 1430 for (int i = childrenCount - 1; i >= 0; i--) { 1431 final View child = children[i]; 1432 if (!canViewReceivePointerEvents(child) 1433 || !isTransformedTouchPointInView(x, y, child, null)) { 1434 continue; 1435 } 1436 1437 // Obtain a hover target for this child. Dequeue it from the 1438 // old hover target list if the child was previously hovered. 1439 HoverTarget hoverTarget = firstOldHoverTarget; 1440 final boolean wasHovered; 1441 for (HoverTarget predecessor = null; ;) { 1442 if (hoverTarget == null) { 1443 hoverTarget = HoverTarget.obtain(child); 1444 wasHovered = false; 1445 break; 1446 } 1447 1448 if (hoverTarget.child == child) { 1449 if (predecessor != null) { 1450 predecessor.next = hoverTarget.next; 1451 } else { 1452 firstOldHoverTarget = hoverTarget.next; 1453 } 1454 hoverTarget.next = null; 1455 wasHovered = true; 1456 break; 1457 } 1458 1459 predecessor = hoverTarget; 1460 hoverTarget = hoverTarget.next; 1461 } 1462 1463 // Enqueue the hover target onto the new hover target list. 1464 if (lastHoverTarget != null) { 1465 lastHoverTarget.next = hoverTarget; 1466 } else { 1467 lastHoverTarget = hoverTarget; 1468 mFirstHoverTarget = hoverTarget; 1469 } 1470 1471 // Dispatch the event to the child. 1472 if (action == MotionEvent.ACTION_HOVER_ENTER) { 1473 if (!wasHovered) { 1474 // Send the enter as is. 1475 handled |= dispatchTransformedGenericPointerEvent( 1476 event, child); // enter 1477 } 1478 } else if (action == MotionEvent.ACTION_HOVER_MOVE) { 1479 if (!wasHovered) { 1480 // Synthesize an enter from a move. 1481 eventNoHistory = obtainMotionEventNoHistoryOrSelf(eventNoHistory); 1482 eventNoHistory.setAction(MotionEvent.ACTION_HOVER_ENTER); 1483 handled |= dispatchTransformedGenericPointerEvent( 1484 eventNoHistory, child); // enter 1485 eventNoHistory.setAction(action); 1486 1487 handled |= dispatchTransformedGenericPointerEvent( 1488 eventNoHistory, child); // move 1489 } else { 1490 // Send the move as is. 1491 handled |= dispatchTransformedGenericPointerEvent(event, child); 1492 } 1493 } 1494 if (handled) { 1495 break; 1496 } 1497 } 1498 } 1499 } 1500 1501 // Send exit events to all previously hovered children that are no longer hovered. 1502 while (firstOldHoverTarget != null) { 1503 final View child = firstOldHoverTarget.child; 1504 1505 // Exit the old hovered child. 1506 if (action == MotionEvent.ACTION_HOVER_EXIT) { 1507 // Send the exit as is. 1508 handled |= dispatchTransformedGenericPointerEvent( 1509 event, child); // exit 1510 } else { 1511 // Synthesize an exit from a move or enter. 1512 // Ignore the result because hover focus has moved to a different view. 1513 if (action == MotionEvent.ACTION_HOVER_MOVE) { 1514 dispatchTransformedGenericPointerEvent( 1515 event, child); // move 1516 } 1517 eventNoHistory = obtainMotionEventNoHistoryOrSelf(eventNoHistory); 1518 eventNoHistory.setAction(MotionEvent.ACTION_HOVER_EXIT); 1519 dispatchTransformedGenericPointerEvent( 1520 eventNoHistory, child); // exit 1521 eventNoHistory.setAction(action); 1522 } 1523 1524 final HoverTarget nextOldHoverTarget = firstOldHoverTarget.next; 1525 firstOldHoverTarget.recycle(); 1526 firstOldHoverTarget = nextOldHoverTarget; 1527 } 1528 1529 // Send events to the view group itself if no children have handled it. 1530 boolean newHoveredSelf = !handled; 1531 if (newHoveredSelf == mHoveredSelf) { 1532 if (newHoveredSelf) { 1533 // Send event to the view group as before. 1534 handled |= super.dispatchHoverEvent(event); 1535 } 1536 } else { 1537 if (mHoveredSelf) { 1538 // Exit the view group. 1539 if (action == MotionEvent.ACTION_HOVER_EXIT) { 1540 // Send the exit as is. 1541 handled |= super.dispatchHoverEvent(event); // exit 1542 } else { 1543 // Synthesize an exit from a move or enter. 1544 // Ignore the result because hover focus is moving to a different view. 1545 if (action == MotionEvent.ACTION_HOVER_MOVE) { 1546 super.dispatchHoverEvent(event); // move 1547 } 1548 eventNoHistory = obtainMotionEventNoHistoryOrSelf(eventNoHistory); 1549 eventNoHistory.setAction(MotionEvent.ACTION_HOVER_EXIT); 1550 super.dispatchHoverEvent(eventNoHistory); // exit 1551 eventNoHistory.setAction(action); 1552 } 1553 mHoveredSelf = false; 1554 } 1555 1556 if (newHoveredSelf) { 1557 // Enter the view group. 1558 if (action == MotionEvent.ACTION_HOVER_ENTER) { 1559 // Send the enter as is. 1560 handled |= super.dispatchHoverEvent(event); // enter 1561 mHoveredSelf = true; 1562 } else if (action == MotionEvent.ACTION_HOVER_MOVE) { 1563 // Synthesize an enter from a move. 1564 eventNoHistory = obtainMotionEventNoHistoryOrSelf(eventNoHistory); 1565 eventNoHistory.setAction(MotionEvent.ACTION_HOVER_ENTER); 1566 handled |= super.dispatchHoverEvent(eventNoHistory); // enter 1567 eventNoHistory.setAction(action); 1568 1569 handled |= super.dispatchHoverEvent(eventNoHistory); // move 1570 mHoveredSelf = true; 1571 } 1572 } 1573 } 1574 1575 // Recycle the copy of the event that we made. 1576 if (eventNoHistory != event) { 1577 eventNoHistory.recycle(); 1578 } 1579 1580 // Done. 1581 return handled; 1582 } 1583 1584 private void exitHoverTargets() { 1585 if (mHoveredSelf || mFirstHoverTarget != null) { 1586 final long now = SystemClock.uptimeMillis(); 1587 MotionEvent event = MotionEvent.obtain(now, now, 1588 MotionEvent.ACTION_HOVER_EXIT, 0.0f, 0.0f, 0); 1589 event.setSource(InputDevice.SOURCE_TOUCHSCREEN); 1590 dispatchHoverEvent(event); 1591 event.recycle(); 1592 } 1593 } 1594 1595 private void cancelHoverTarget(View view) { 1596 HoverTarget predecessor = null; 1597 HoverTarget target = mFirstHoverTarget; 1598 while (target != null) { 1599 final HoverTarget next = target.next; 1600 if (target.child == view) { 1601 if (predecessor == null) { 1602 mFirstHoverTarget = next; 1603 } else { 1604 predecessor.next = next; 1605 } 1606 target.recycle(); 1607 1608 final long now = SystemClock.uptimeMillis(); 1609 MotionEvent event = MotionEvent.obtain(now, now, 1610 MotionEvent.ACTION_HOVER_EXIT, 0.0f, 0.0f, 0); 1611 event.setSource(InputDevice.SOURCE_TOUCHSCREEN); 1612 view.dispatchHoverEvent(event); 1613 event.recycle(); 1614 return; 1615 } 1616 predecessor = target; 1617 target = next; 1618 } 1619 } 1620 1621 /** @hide */ 1622 @Override 1623 protected boolean hasHoveredChild() { 1624 return mFirstHoverTarget != null; 1625 } 1626 1627 @Override 1628 public void addChildrenForAccessibility(ArrayList<View> childrenForAccessibility) { 1629 ChildListForAccessibility children = ChildListForAccessibility.obtain(this, true); 1630 try { 1631 final int childrenCount = children.getChildCount(); 1632 for (int i = 0; i < childrenCount; i++) { 1633 View child = children.getChildAt(i); 1634 if ((child.mViewFlags & VISIBILITY_MASK) == VISIBLE) { 1635 if (child.includeForAccessibility()) { 1636 childrenForAccessibility.add(child); 1637 } else { 1638 child.addChildrenForAccessibility(childrenForAccessibility); 1639 } 1640 } 1641 } 1642 } finally { 1643 children.recycle(); 1644 } 1645 } 1646 1647 /** 1648 * @hide 1649 */ 1650 @Override 1651 public void childAccessibilityStateChanged(View child) { 1652 if (mParent != null) { 1653 mParent.childAccessibilityStateChanged(child); 1654 } 1655 } 1656 1657 /** 1658 * Implement this method to intercept hover events before they are handled 1659 * by child views. 1660 * <p> 1661 * This method is called before dispatching a hover event to a child of 1662 * the view group or to the view group's own {@link #onHoverEvent} to allow 1663 * the view group a chance to intercept the hover event. 1664 * This method can also be used to watch all pointer motions that occur within 1665 * the bounds of the view group even when the pointer is hovering over 1666 * a child of the view group rather than over the view group itself. 1667 * </p><p> 1668 * The view group can prevent its children from receiving hover events by 1669 * implementing this method and returning <code>true</code> to indicate 1670 * that it would like to intercept hover events. The view group must 1671 * continuously return <code>true</code> from {@link #onInterceptHoverEvent} 1672 * for as long as it wishes to continue intercepting hover events from 1673 * its children. 1674 * </p><p> 1675 * Interception preserves the invariant that at most one view can be 1676 * hovered at a time by transferring hover focus from the currently hovered 1677 * child to the view group or vice-versa as needed. 1678 * </p><p> 1679 * If this method returns <code>true</code> and a child is already hovered, then the 1680 * child view will first receive a hover exit event and then the view group 1681 * itself will receive a hover enter event in {@link #onHoverEvent}. 1682 * Likewise, if this method had previously returned <code>true</code> to intercept hover 1683 * events and instead returns <code>false</code> while the pointer is hovering 1684 * within the bounds of one of a child, then the view group will first receive a 1685 * hover exit event in {@link #onHoverEvent} and then the hovered child will 1686 * receive a hover enter event. 1687 * </p><p> 1688 * The default implementation always returns false. 1689 * </p> 1690 * 1691 * @param event The motion event that describes the hover. 1692 * @return True if the view group would like to intercept the hover event 1693 * and prevent its children from receiving it. 1694 */ 1695 public boolean onInterceptHoverEvent(MotionEvent event) { 1696 return false; 1697 } 1698 1699 private static MotionEvent obtainMotionEventNoHistoryOrSelf(MotionEvent event) { 1700 if (event.getHistorySize() == 0) { 1701 return event; 1702 } 1703 return MotionEvent.obtainNoHistory(event); 1704 } 1705 1706 /** 1707 * {@inheritDoc} 1708 */ 1709 @Override 1710 protected boolean dispatchGenericPointerEvent(MotionEvent event) { 1711 // Send the event to the child under the pointer. 1712 final int childrenCount = mChildrenCount; 1713 if (childrenCount != 0) { 1714 final View[] children = mChildren; 1715 final float x = event.getX(); 1716 final float y = event.getY(); 1717 1718 for (int i = childrenCount - 1; i >= 0; i--) { 1719 final View child = children[i]; 1720 if (!canViewReceivePointerEvents(child) 1721 || !isTransformedTouchPointInView(x, y, child, null)) { 1722 continue; 1723 } 1724 1725 if (dispatchTransformedGenericPointerEvent(event, child)) { 1726 return true; 1727 } 1728 } 1729 } 1730 1731 // No child handled the event. Send it to this view group. 1732 return super.dispatchGenericPointerEvent(event); 1733 } 1734 1735 /** 1736 * {@inheritDoc} 1737 */ 1738 @Override 1739 protected boolean dispatchGenericFocusedEvent(MotionEvent event) { 1740 // Send the event to the focused child or to this view group if it has focus. 1741 if ((mPrivateFlags & (FOCUSED | HAS_BOUNDS)) == (FOCUSED | HAS_BOUNDS)) { 1742 return super.dispatchGenericFocusedEvent(event); 1743 } else if (mFocused != null && (mFocused.mPrivateFlags & HAS_BOUNDS) == HAS_BOUNDS) { 1744 return mFocused.dispatchGenericMotionEvent(event); 1745 } 1746 return false; 1747 } 1748 1749 /** 1750 * Dispatches a generic pointer event to a child, taking into account 1751 * transformations that apply to the child. 1752 * 1753 * @param event The event to send. 1754 * @param child The view to send the event to. 1755 * @return {@code true} if the child handled the event. 1756 */ 1757 private boolean dispatchTransformedGenericPointerEvent(MotionEvent event, View child) { 1758 final float offsetX = mScrollX - child.mLeft; 1759 final float offsetY = mScrollY - child.mTop; 1760 1761 boolean handled; 1762 if (!child.hasIdentityMatrix()) { 1763 MotionEvent transformedEvent = MotionEvent.obtain(event); 1764 transformedEvent.offsetLocation(offsetX, offsetY); 1765 transformedEvent.transform(child.getInverseMatrix()); 1766 handled = child.dispatchGenericMotionEvent(transformedEvent); 1767 transformedEvent.recycle(); 1768 } else { 1769 event.offsetLocation(offsetX, offsetY); 1770 handled = child.dispatchGenericMotionEvent(event); 1771 event.offsetLocation(-offsetX, -offsetY); 1772 } 1773 return handled; 1774 } 1775 1776 /** 1777 * {@inheritDoc} 1778 */ 1779 @Override 1780 public boolean dispatchTouchEvent(MotionEvent ev) { 1781 if (mInputEventConsistencyVerifier != null) { 1782 mInputEventConsistencyVerifier.onTouchEvent(ev, 1); 1783 } 1784 1785 boolean handled = false; 1786 if (onFilterTouchEventForSecurity(ev)) { 1787 final int action = ev.getAction(); 1788 final int actionMasked = action & MotionEvent.ACTION_MASK; 1789 1790 // Handle an initial down. 1791 if (actionMasked == MotionEvent.ACTION_DOWN) { 1792 // Throw away all previous state when starting a new touch gesture. 1793 // The framework may have dropped the up or cancel event for the previous gesture 1794 // due to an app switch, ANR, or some other state change. 1795 cancelAndClearTouchTargets(ev); 1796 resetTouchState(); 1797 } 1798 1799 // Check for interception. 1800 final boolean intercepted; 1801 if (actionMasked == MotionEvent.ACTION_DOWN 1802 || mFirstTouchTarget != null) { 1803 final boolean disallowIntercept = (mGroupFlags & FLAG_DISALLOW_INTERCEPT) != 0; 1804 if (!disallowIntercept) { 1805 intercepted = onInterceptTouchEvent(ev); 1806 ev.setAction(action); // restore action in case it was changed 1807 } else { 1808 intercepted = false; 1809 } 1810 } else { 1811 // There are no touch targets and this action is not an initial down 1812 // so this view group continues to intercept touches. 1813 intercepted = true; 1814 } 1815 1816 // Check for cancelation. 1817 final boolean canceled = resetCancelNextUpFlag(this) 1818 || actionMasked == MotionEvent.ACTION_CANCEL; 1819 1820 // Update list of touch targets for pointer down, if needed. 1821 final boolean split = (mGroupFlags & FLAG_SPLIT_MOTION_EVENTS) != 0; 1822 TouchTarget newTouchTarget = null; 1823 boolean alreadyDispatchedToNewTouchTarget = false; 1824 if (!canceled && !intercepted) { 1825 if (actionMasked == MotionEvent.ACTION_DOWN 1826 || (split && actionMasked == MotionEvent.ACTION_POINTER_DOWN) 1827 || actionMasked == MotionEvent.ACTION_HOVER_MOVE) { 1828 final int actionIndex = ev.getActionIndex(); // always 0 for down 1829 final int idBitsToAssign = split ? 1 << ev.getPointerId(actionIndex) 1830 : TouchTarget.ALL_POINTER_IDS; 1831 1832 // Clean up earlier touch targets for this pointer id in case they 1833 // have become out of sync. 1834 removePointersFromTouchTargets(idBitsToAssign); 1835 1836 final int childrenCount = mChildrenCount; 1837 if (childrenCount != 0) { 1838 // Find a child that can receive the event. 1839 // Scan children from front to back. 1840 final View[] children = mChildren; 1841 final float x = ev.getX(actionIndex); 1842 final float y = ev.getY(actionIndex); 1843 1844 for (int i = childrenCount - 1; i >= 0; i--) { 1845 final View child = children[i]; 1846 if (!canViewReceivePointerEvents(child) 1847 || !isTransformedTouchPointInView(x, y, child, null)) { 1848 continue; 1849 } 1850 1851 newTouchTarget = getTouchTarget(child); 1852 if (newTouchTarget != null) { 1853 // Child is already receiving touch within its bounds. 1854 // Give it the new pointer in addition to the ones it is handling. 1855 newTouchTarget.pointerIdBits |= idBitsToAssign; 1856 break; 1857 } 1858 1859 resetCancelNextUpFlag(child); 1860 if (dispatchTransformedTouchEvent(ev, false, child, idBitsToAssign)) { 1861 // Child wants to receive touch within its bounds. 1862 mLastTouchDownTime = ev.getDownTime(); 1863 mLastTouchDownIndex = i; 1864 mLastTouchDownX = ev.getX(); 1865 mLastTouchDownY = ev.getY(); 1866 newTouchTarget = addTouchTarget(child, idBitsToAssign); 1867 alreadyDispatchedToNewTouchTarget = true; 1868 break; 1869 } 1870 } 1871 } 1872 1873 if (newTouchTarget == null && mFirstTouchTarget != null) { 1874 // Did not find a child to receive the event. 1875 // Assign the pointer to the least recently added target. 1876 newTouchTarget = mFirstTouchTarget; 1877 while (newTouchTarget.next != null) { 1878 newTouchTarget = newTouchTarget.next; 1879 } 1880 newTouchTarget.pointerIdBits |= idBitsToAssign; 1881 } 1882 } 1883 } 1884 1885 // Dispatch to touch targets. 1886 if (mFirstTouchTarget == null) { 1887 // No touch targets so treat this as an ordinary view. 1888 handled = dispatchTransformedTouchEvent(ev, canceled, null, 1889 TouchTarget.ALL_POINTER_IDS); 1890 } else { 1891 // Dispatch to touch targets, excluding the new touch target if we already 1892 // dispatched to it. Cancel touch targets if necessary. 1893 TouchTarget predecessor = null; 1894 TouchTarget target = mFirstTouchTarget; 1895 while (target != null) { 1896 final TouchTarget next = target.next; 1897 if (alreadyDispatchedToNewTouchTarget && target == newTouchTarget) { 1898 handled = true; 1899 } else { 1900 final boolean cancelChild = resetCancelNextUpFlag(target.child) 1901 || intercepted; 1902 if (dispatchTransformedTouchEvent(ev, cancelChild, 1903 target.child, target.pointerIdBits)) { 1904 handled = true; 1905 } 1906 if (cancelChild) { 1907 if (predecessor == null) { 1908 mFirstTouchTarget = next; 1909 } else { 1910 predecessor.next = next; 1911 } 1912 target.recycle(); 1913 target = next; 1914 continue; 1915 } 1916 } 1917 predecessor = target; 1918 target = next; 1919 } 1920 } 1921 1922 // Update list of touch targets for pointer up or cancel, if needed. 1923 if (canceled 1924 || actionMasked == MotionEvent.ACTION_UP 1925 || actionMasked == MotionEvent.ACTION_HOVER_MOVE) { 1926 resetTouchState(); 1927 } else if (split && actionMasked == MotionEvent.ACTION_POINTER_UP) { 1928 final int actionIndex = ev.getActionIndex(); 1929 final int idBitsToRemove = 1 << ev.getPointerId(actionIndex); 1930 removePointersFromTouchTargets(idBitsToRemove); 1931 } 1932 } 1933 1934 if (!handled && mInputEventConsistencyVerifier != null) { 1935 mInputEventConsistencyVerifier.onUnhandledEvent(ev, 1); 1936 } 1937 return handled; 1938 } 1939 1940 /** 1941 * Resets all touch state in preparation for a new cycle. 1942 */ 1943 private void resetTouchState() { 1944 clearTouchTargets(); 1945 resetCancelNextUpFlag(this); 1946 mGroupFlags &= ~FLAG_DISALLOW_INTERCEPT; 1947 } 1948 1949 /** 1950 * Resets the cancel next up flag. 1951 * Returns true if the flag was previously set. 1952 */ 1953 private static boolean resetCancelNextUpFlag(View view) { 1954 if ((view.mPrivateFlags & CANCEL_NEXT_UP_EVENT) != 0) { 1955 view.mPrivateFlags &= ~CANCEL_NEXT_UP_EVENT; 1956 return true; 1957 } 1958 return false; 1959 } 1960 1961 /** 1962 * Clears all touch targets. 1963 */ 1964 private void clearTouchTargets() { 1965 TouchTarget target = mFirstTouchTarget; 1966 if (target != null) { 1967 do { 1968 TouchTarget next = target.next; 1969 target.recycle(); 1970 target = next; 1971 } while (target != null); 1972 mFirstTouchTarget = null; 1973 } 1974 } 1975 1976 /** 1977 * Cancels and clears all touch targets. 1978 */ 1979 private void cancelAndClearTouchTargets(MotionEvent event) { 1980 if (mFirstTouchTarget != null) { 1981 boolean syntheticEvent = false; 1982 if (event == null) { 1983 final long now = SystemClock.uptimeMillis(); 1984 event = MotionEvent.obtain(now, now, 1985 MotionEvent.ACTION_CANCEL, 0.0f, 0.0f, 0); 1986 event.setSource(InputDevice.SOURCE_TOUCHSCREEN); 1987 syntheticEvent = true; 1988 } 1989 1990 for (TouchTarget target = mFirstTouchTarget; target != null; target = target.next) { 1991 resetCancelNextUpFlag(target.child); 1992 dispatchTransformedTouchEvent(event, true, target.child, target.pointerIdBits); 1993 } 1994 clearTouchTargets(); 1995 1996 if (syntheticEvent) { 1997 event.recycle(); 1998 } 1999 } 2000 } 2001 2002 /** 2003 * Gets the touch target for specified child view. 2004 * Returns null if not found. 2005 */ 2006 private TouchTarget getTouchTarget(View child) { 2007 for (TouchTarget target = mFirstTouchTarget; target != null; target = target.next) { 2008 if (target.child == child) { 2009 return target; 2010 } 2011 } 2012 return null; 2013 } 2014 2015 /** 2016 * Adds a touch target for specified child to the beginning of the list. 2017 * Assumes the target child is not already present. 2018 */ 2019 private TouchTarget addTouchTarget(View child, int pointerIdBits) { 2020 TouchTarget target = TouchTarget.obtain(child, pointerIdBits); 2021 target.next = mFirstTouchTarget; 2022 mFirstTouchTarget = target; 2023 return target; 2024 } 2025 2026 /** 2027 * Removes the pointer ids from consideration. 2028 */ 2029 private void removePointersFromTouchTargets(int pointerIdBits) { 2030 TouchTarget predecessor = null; 2031 TouchTarget target = mFirstTouchTarget; 2032 while (target != null) { 2033 final TouchTarget next = target.next; 2034 if ((target.pointerIdBits & pointerIdBits) != 0) { 2035 target.pointerIdBits &= ~pointerIdBits; 2036 if (target.pointerIdBits == 0) { 2037 if (predecessor == null) { 2038 mFirstTouchTarget = next; 2039 } else { 2040 predecessor.next = next; 2041 } 2042 target.recycle(); 2043 target = next; 2044 continue; 2045 } 2046 } 2047 predecessor = target; 2048 target = next; 2049 } 2050 } 2051 2052 private void cancelTouchTarget(View view) { 2053 TouchTarget predecessor = null; 2054 TouchTarget target = mFirstTouchTarget; 2055 while (target != null) { 2056 final TouchTarget next = target.next; 2057 if (target.child == view) { 2058 if (predecessor == null) { 2059 mFirstTouchTarget = next; 2060 } else { 2061 predecessor.next = next; 2062 } 2063 target.recycle(); 2064 2065 final long now = SystemClock.uptimeMillis(); 2066 MotionEvent event = MotionEvent.obtain(now, now, 2067 MotionEvent.ACTION_CANCEL, 0.0f, 0.0f, 0); 2068 event.setSource(InputDevice.SOURCE_TOUCHSCREEN); 2069 view.dispatchTouchEvent(event); 2070 event.recycle(); 2071 return; 2072 } 2073 predecessor = target; 2074 target = next; 2075 } 2076 } 2077 2078 /** 2079 * Returns true if a child view can receive pointer events. 2080 * @hide 2081 */ 2082 private static boolean canViewReceivePointerEvents(View child) { 2083 return (child.mViewFlags & VISIBILITY_MASK) == VISIBLE 2084 || child.getAnimation() != null; 2085 } 2086 2087 /** 2088 * Returns true if a child view contains the specified point when transformed 2089 * into its coordinate space. 2090 * Child must not be null. 2091 * @hide 2092 */ 2093 protected boolean isTransformedTouchPointInView(float x, float y, View child, 2094 PointF outLocalPoint) { 2095 float localX = x + mScrollX - child.mLeft; 2096 float localY = y + mScrollY - child.mTop; 2097 if (! child.hasIdentityMatrix() && mAttachInfo != null) { 2098 final float[] localXY = mAttachInfo.mTmpTransformLocation; 2099 localXY[0] = localX; 2100 localXY[1] = localY; 2101 child.getInverseMatrix().mapPoints(localXY); 2102 localX = localXY[0]; 2103 localY = localXY[1]; 2104 } 2105 final boolean isInView = child.pointInView(localX, localY); 2106 if (isInView && outLocalPoint != null) { 2107 outLocalPoint.set(localX, localY); 2108 } 2109 return isInView; 2110 } 2111 2112 /** 2113 * Transforms a motion event into the coordinate space of a particular child view, 2114 * filters out irrelevant pointer ids, and overrides its action if necessary. 2115 * If child is null, assumes the MotionEvent will be sent to this ViewGroup instead. 2116 */ 2117 private boolean dispatchTransformedTouchEvent(MotionEvent event, boolean cancel, 2118 View child, int desiredPointerIdBits) { 2119 final boolean handled; 2120 2121 // Canceling motions is a special case. We don't need to perform any transformations 2122 // or filtering. The important part is the action, not the contents. 2123 final int oldAction = event.getAction(); 2124 if (cancel || oldAction == MotionEvent.ACTION_CANCEL) { 2125 event.setAction(MotionEvent.ACTION_CANCEL); 2126 if (child == null) { 2127 handled = super.dispatchTouchEvent(event); 2128 } else { 2129 handled = child.dispatchTouchEvent(event); 2130 } 2131 event.setAction(oldAction); 2132 return handled; 2133 } 2134 2135 // Calculate the number of pointers to deliver. 2136 final int oldPointerIdBits = event.getPointerIdBits(); 2137 final int newPointerIdBits = oldPointerIdBits & desiredPointerIdBits; 2138 2139 // If for some reason we ended up in an inconsistent state where it looks like we 2140 // might produce a motion event with no pointers in it, then drop the event. 2141 if (newPointerIdBits == 0) { 2142 return false; 2143 } 2144 2145 // If the number of pointers is the same and we don't need to perform any fancy 2146 // irreversible transformations, then we can reuse the motion event for this 2147 // dispatch as long as we are careful to revert any changes we make. 2148 // Otherwise we need to make a copy. 2149 final MotionEvent transformedEvent; 2150 if (newPointerIdBits == oldPointerIdBits) { 2151 if (child == null || child.hasIdentityMatrix()) { 2152 if (child == null) { 2153 handled = super.dispatchTouchEvent(event); 2154 } else { 2155 final float offsetX = mScrollX - child.mLeft; 2156 final float offsetY = mScrollY - child.mTop; 2157 event.offsetLocation(offsetX, offsetY); 2158 2159 handled = child.dispatchTouchEvent(event); 2160 2161 event.offsetLocation(-offsetX, -offsetY); 2162 } 2163 return handled; 2164 } 2165 transformedEvent = MotionEvent.obtain(event); 2166 } else { 2167 transformedEvent = event.split(newPointerIdBits); 2168 } 2169 2170 // Perform any necessary transformations and dispatch. 2171 if (child == null) { 2172 handled = super.dispatchTouchEvent(transformedEvent); 2173 } else { 2174 final float offsetX = mScrollX - child.mLeft; 2175 final float offsetY = mScrollY - child.mTop; 2176 transformedEvent.offsetLocation(offsetX, offsetY); 2177 if (! child.hasIdentityMatrix()) { 2178 transformedEvent.transform(child.getInverseMatrix()); 2179 } 2180 2181 handled = child.dispatchTouchEvent(transformedEvent); 2182 } 2183 2184 // Done. 2185 transformedEvent.recycle(); 2186 return handled; 2187 } 2188 2189 /** 2190 * Enable or disable the splitting of MotionEvents to multiple children during touch event 2191 * dispatch. This behavior is enabled by default for applications that target an 2192 * SDK version of {@link Build.VERSION_CODES#HONEYCOMB} or newer. 2193 * 2194 * <p>When this option is enabled MotionEvents may be split and dispatched to different child 2195 * views depending on where each pointer initially went down. This allows for user interactions 2196 * such as scrolling two panes of content independently, chording of buttons, and performing 2197 * independent gestures on different pieces of content. 2198 * 2199 * @param split <code>true</code> to allow MotionEvents to be split and dispatched to multiple 2200 * child views. <code>false</code> to only allow one child view to be the target of 2201 * any MotionEvent received by this ViewGroup. 2202 */ 2203 public void setMotionEventSplittingEnabled(boolean split) { 2204 // TODO Applications really shouldn't change this setting mid-touch event, 2205 // but perhaps this should handle that case and send ACTION_CANCELs to any child views 2206 // with gestures in progress when this is changed. 2207 if (split) { 2208 mGroupFlags |= FLAG_SPLIT_MOTION_EVENTS; 2209 } else { 2210 mGroupFlags &= ~FLAG_SPLIT_MOTION_EVENTS; 2211 } 2212 } 2213 2214 /** 2215 * Returns true if MotionEvents dispatched to this ViewGroup can be split to multiple children. 2216 * @return true if MotionEvents dispatched to this ViewGroup can be split to multiple children. 2217 */ 2218 public boolean isMotionEventSplittingEnabled() { 2219 return (mGroupFlags & FLAG_SPLIT_MOTION_EVENTS) == FLAG_SPLIT_MOTION_EVENTS; 2220 } 2221 2222 /** 2223 * {@inheritDoc} 2224 */ 2225 public void requestDisallowInterceptTouchEvent(boolean disallowIntercept) { 2226 2227 if (disallowIntercept == ((mGroupFlags & FLAG_DISALLOW_INTERCEPT) != 0)) { 2228 // We're already in this state, assume our ancestors are too 2229 return; 2230 } 2231 2232 if (disallowIntercept) { 2233 mGroupFlags |= FLAG_DISALLOW_INTERCEPT; 2234 } else { 2235 mGroupFlags &= ~FLAG_DISALLOW_INTERCEPT; 2236 } 2237 2238 // Pass it up to our parent 2239 if (mParent != null) { 2240 mParent.requestDisallowInterceptTouchEvent(disallowIntercept); 2241 } 2242 } 2243 2244 /** 2245 * Implement this method to intercept all touch screen motion events. This 2246 * allows you to watch events as they are dispatched to your children, and 2247 * take ownership of the current gesture at any point. 2248 * 2249 * <p>Using this function takes some care, as it has a fairly complicated 2250 * interaction with {@link View#onTouchEvent(MotionEvent) 2251 * View.onTouchEvent(MotionEvent)}, and using it requires implementing 2252 * that method as well as this one in the correct way. Events will be 2253 * received in the following order: 2254 * 2255 * <ol> 2256 * <li> You will receive the down event here. 2257 * <li> The down event will be handled either by a child of this view 2258 * group, or given to your own onTouchEvent() method to handle; this means 2259 * you should implement onTouchEvent() to return true, so you will 2260 * continue to see the rest of the gesture (instead of looking for 2261 * a parent view to handle it). Also, by returning true from 2262 * onTouchEvent(), you will not receive any following 2263 * events in onInterceptTouchEvent() and all touch processing must 2264 * happen in onTouchEvent() like normal. 2265 * <li> For as long as you return false from this function, each following 2266 * event (up to and including the final up) will be delivered first here 2267 * and then to the target's onTouchEvent(). 2268 * <li> If you return true from here, you will not receive any 2269 * following events: the target view will receive the same event but 2270 * with the action {@link MotionEvent#ACTION_CANCEL}, and all further 2271 * events will be delivered to your onTouchEvent() method and no longer 2272 * appear here. 2273 * </ol> 2274 * 2275 * @param ev The motion event being dispatched down the hierarchy. 2276 * @return Return true to steal motion events from the children and have 2277 * them dispatched to this ViewGroup through onTouchEvent(). 2278 * The current target will receive an ACTION_CANCEL event, and no further 2279 * messages will be delivered here. 2280 */ 2281 public boolean onInterceptTouchEvent(MotionEvent ev) { 2282 return false; 2283 } 2284 2285 /** 2286 * {@inheritDoc} 2287 * 2288 * Looks for a view to give focus to respecting the setting specified by 2289 * {@link #getDescendantFocusability()}. 2290 * 2291 * Uses {@link #onRequestFocusInDescendants(int, android.graphics.Rect)} to 2292 * find focus within the children of this group when appropriate. 2293 * 2294 * @see #FOCUS_BEFORE_DESCENDANTS 2295 * @see #FOCUS_AFTER_DESCENDANTS 2296 * @see #FOCUS_BLOCK_DESCENDANTS 2297 * @see #onRequestFocusInDescendants(int, android.graphics.Rect) 2298 */ 2299 @Override 2300 public boolean requestFocus(int direction, Rect previouslyFocusedRect) { 2301 if (DBG) { 2302 System.out.println(this + " ViewGroup.requestFocus direction=" 2303 + direction); 2304 } 2305 int descendantFocusability = getDescendantFocusability(); 2306 2307 switch (descendantFocusability) { 2308 case FOCUS_BLOCK_DESCENDANTS: 2309 return super.requestFocus(direction, previouslyFocusedRect); 2310 case FOCUS_BEFORE_DESCENDANTS: { 2311 final boolean took = super.requestFocus(direction, previouslyFocusedRect); 2312 return took ? took : onRequestFocusInDescendants(direction, previouslyFocusedRect); 2313 } 2314 case FOCUS_AFTER_DESCENDANTS: { 2315 final boolean took = onRequestFocusInDescendants(direction, previouslyFocusedRect); 2316 return took ? took : super.requestFocus(direction, previouslyFocusedRect); 2317 } 2318 default: 2319 throw new IllegalStateException("descendant focusability must be " 2320 + "one of FOCUS_BEFORE_DESCENDANTS, FOCUS_AFTER_DESCENDANTS, FOCUS_BLOCK_DESCENDANTS " 2321 + "but is " + descendantFocusability); 2322 } 2323 } 2324 2325 /** 2326 * Look for a descendant to call {@link View#requestFocus} on. 2327 * Called by {@link ViewGroup#requestFocus(int, android.graphics.Rect)} 2328 * when it wants to request focus within its children. Override this to 2329 * customize how your {@link ViewGroup} requests focus within its children. 2330 * @param direction One of FOCUS_UP, FOCUS_DOWN, FOCUS_LEFT, and FOCUS_RIGHT 2331 * @param previouslyFocusedRect The rectangle (in this View's coordinate system) 2332 * to give a finer grained hint about where focus is coming from. May be null 2333 * if there is no hint. 2334 * @return Whether focus was taken. 2335 */ 2336 @SuppressWarnings({"ConstantConditions"}) 2337 protected boolean onRequestFocusInDescendants(int direction, 2338 Rect previouslyFocusedRect) { 2339 int index; 2340 int increment; 2341 int end; 2342 int count = mChildrenCount; 2343 if ((direction & FOCUS_FORWARD) != 0) { 2344 index = 0; 2345 increment = 1; 2346 end = count; 2347 } else { 2348 index = count - 1; 2349 increment = -1; 2350 end = -1; 2351 } 2352 final View[] children = mChildren; 2353 for (int i = index; i != end; i += increment) { 2354 View child = children[i]; 2355 if ((child.mViewFlags & VISIBILITY_MASK) == VISIBLE) { 2356 if (child.requestFocus(direction, previouslyFocusedRect)) { 2357 return true; 2358 } 2359 } 2360 } 2361 return false; 2362 } 2363 2364 /** 2365 * {@inheritDoc} 2366 * 2367 * @hide 2368 */ 2369 @Override 2370 public void dispatchStartTemporaryDetach() { 2371 super.dispatchStartTemporaryDetach(); 2372 final int count = mChildrenCount; 2373 final View[] children = mChildren; 2374 for (int i = 0; i < count; i++) { 2375 children[i].dispatchStartTemporaryDetach(); 2376 } 2377 } 2378 2379 /** 2380 * {@inheritDoc} 2381 * 2382 * @hide 2383 */ 2384 @Override 2385 public void dispatchFinishTemporaryDetach() { 2386 super.dispatchFinishTemporaryDetach(); 2387 final int count = mChildrenCount; 2388 final View[] children = mChildren; 2389 for (int i = 0; i < count; i++) { 2390 children[i].dispatchFinishTemporaryDetach(); 2391 } 2392 } 2393 2394 /** 2395 * {@inheritDoc} 2396 */ 2397 @Override 2398 void dispatchAttachedToWindow(AttachInfo info, int visibility) { 2399 mGroupFlags |= FLAG_PREVENT_DISPATCH_ATTACHED_TO_WINDOW; 2400 super.dispatchAttachedToWindow(info, visibility); 2401 mGroupFlags &= ~FLAG_PREVENT_DISPATCH_ATTACHED_TO_WINDOW; 2402 2403 final int count = mChildrenCount; 2404 final View[] children = mChildren; 2405 for (int i = 0; i < count; i++) { 2406 final View child = children[i]; 2407 child.dispatchAttachedToWindow(info, 2408 visibility | (child.mViewFlags&VISIBILITY_MASK)); 2409 } 2410 } 2411 2412 @Override 2413 void dispatchScreenStateChanged(int screenState) { 2414 super.dispatchScreenStateChanged(screenState); 2415 2416 final int count = mChildrenCount; 2417 final View[] children = mChildren; 2418 for (int i = 0; i < count; i++) { 2419 children[i].dispatchScreenStateChanged(screenState); 2420 } 2421 } 2422 2423 @Override 2424 boolean dispatchPopulateAccessibilityEventInternal(AccessibilityEvent event) { 2425 boolean handled = false; 2426 if (includeForAccessibility()) { 2427 handled = super.dispatchPopulateAccessibilityEventInternal(event); 2428 if (handled) { 2429 return handled; 2430 } 2431 } 2432 // Let our children have a shot in populating the event. 2433 ChildListForAccessibility children = ChildListForAccessibility.obtain(this, true); 2434 try { 2435 final int childCount = children.getChildCount(); 2436 for (int i = 0; i < childCount; i++) { 2437 View child = children.getChildAt(i); 2438 if ((child.mViewFlags & VISIBILITY_MASK) == VISIBLE) { 2439 handled = child.dispatchPopulateAccessibilityEvent(event); 2440 if (handled) { 2441 return handled; 2442 } 2443 } 2444 } 2445 } finally { 2446 children.recycle(); 2447 } 2448 return false; 2449 } 2450 2451 @Override 2452 void onInitializeAccessibilityNodeInfoInternal(AccessibilityNodeInfo info) { 2453 super.onInitializeAccessibilityNodeInfoInternal(info); 2454 if (mAttachInfo != null) { 2455 ArrayList<View> childrenForAccessibility = mAttachInfo.mTempArrayList; 2456 childrenForAccessibility.clear(); 2457 addChildrenForAccessibility(childrenForAccessibility); 2458 final int childrenForAccessibilityCount = childrenForAccessibility.size(); 2459 for (int i = 0; i < childrenForAccessibilityCount; i++) { 2460 View child = childrenForAccessibility.get(i); 2461 info.addChild(child); 2462 } 2463 childrenForAccessibility.clear(); 2464 } 2465 } 2466 2467 @Override 2468 void onInitializeAccessibilityEventInternal(AccessibilityEvent event) { 2469 super.onInitializeAccessibilityEventInternal(event); 2470 event.setClassName(ViewGroup.class.getName()); 2471 } 2472 2473 /** 2474 * @hide 2475 */ 2476 @Override 2477 public void resetAccessibilityStateChanged() { 2478 super.resetAccessibilityStateChanged(); 2479 View[] children = mChildren; 2480 final int childCount = mChildrenCount; 2481 for (int i = 0; i < childCount; i++) { 2482 View child = children[i]; 2483 child.resetAccessibilityStateChanged(); 2484 } 2485 } 2486 2487 /** 2488 * {@inheritDoc} 2489 */ 2490 @Override 2491 void dispatchDetachedFromWindow() { 2492 // If we still have a touch target, we are still in the process of 2493 // dispatching motion events to a child; we need to get rid of that 2494 // child to avoid dispatching events to it after the window is torn 2495 // down. To make sure we keep the child in a consistent state, we 2496 // first send it an ACTION_CANCEL motion event. 2497 cancelAndClearTouchTargets(null); 2498 2499 // Similarly, set ACTION_EXIT to all hover targets and clear them. 2500 exitHoverTargets(); 2501 2502 // In case view is detached while transition is running 2503 mLayoutSuppressed = false; 2504 2505 // Tear down our drag tracking 2506 mDragNotifiedChildren = null; 2507 if (mCurrentDrag != null) { 2508 mCurrentDrag.recycle(); 2509 mCurrentDrag = null; 2510 } 2511 2512 final int count = mChildrenCount; 2513 final View[] children = mChildren; 2514 for (int i = 0; i < count; i++) { 2515 children[i].dispatchDetachedFromWindow(); 2516 } 2517 super.dispatchDetachedFromWindow(); 2518 } 2519 2520 @Override 2521 void internalSetPadding(int left, int top, int right, int bottom) { 2522 super.internalSetPadding(left, top, right, bottom); 2523 2524 if ((mPaddingLeft | mPaddingTop | mPaddingRight | mPaddingBottom) != 0) { 2525 mGroupFlags |= FLAG_PADDING_NOT_NULL; 2526 } else { 2527 mGroupFlags &= ~FLAG_PADDING_NOT_NULL; 2528 } 2529 } 2530 2531 /** 2532 * {@inheritDoc} 2533 */ 2534 @Override 2535 protected void dispatchSaveInstanceState(SparseArray<Parcelable> container) { 2536 super.dispatchSaveInstanceState(container); 2537 final int count = mChildrenCount; 2538 final View[] children = mChildren; 2539 for (int i = 0; i < count; i++) { 2540 View c = children[i]; 2541 if ((c.mViewFlags & PARENT_SAVE_DISABLED_MASK) != PARENT_SAVE_DISABLED) { 2542 c.dispatchSaveInstanceState(container); 2543 } 2544 } 2545 } 2546 2547 /** 2548 * Perform dispatching of a {@link #saveHierarchyState(android.util.SparseArray)} freeze()} 2549 * to only this view, not to its children. For use when overriding 2550 * {@link #dispatchSaveInstanceState(android.util.SparseArray)} dispatchFreeze()} to allow 2551 * subclasses to freeze their own state but not the state of their children. 2552 * 2553 * @param container the container 2554 */ 2555 protected void dispatchFreezeSelfOnly(SparseArray<Parcelable> container) { 2556 super.dispatchSaveInstanceState(container); 2557 } 2558 2559 /** 2560 * {@inheritDoc} 2561 */ 2562 @Override 2563 protected void dispatchRestoreInstanceState(SparseArray<Parcelable> container) { 2564 super.dispatchRestoreInstanceState(container); 2565 final int count = mChildrenCount; 2566 final View[] children = mChildren; 2567 for (int i = 0; i < count; i++) { 2568 View c = children[i]; 2569 if ((c.mViewFlags & PARENT_SAVE_DISABLED_MASK) != PARENT_SAVE_DISABLED) { 2570 c.dispatchRestoreInstanceState(container); 2571 } 2572 } 2573 } 2574 2575 /** 2576 * Perform dispatching of a {@link #restoreHierarchyState(android.util.SparseArray)} 2577 * to only this view, not to its children. For use when overriding 2578 * {@link #dispatchRestoreInstanceState(android.util.SparseArray)} to allow 2579 * subclasses to thaw their own state but not the state of their children. 2580 * 2581 * @param container the container 2582 */ 2583 protected void dispatchThawSelfOnly(SparseArray<Parcelable> container) { 2584 super.dispatchRestoreInstanceState(container); 2585 } 2586 2587 /** 2588 * Enables or disables the drawing cache for each child of this view group. 2589 * 2590 * @param enabled true to enable the cache, false to dispose of it 2591 */ 2592 protected void setChildrenDrawingCacheEnabled(boolean enabled) { 2593 if (enabled || (mPersistentDrawingCache & PERSISTENT_ALL_CACHES) != PERSISTENT_ALL_CACHES) { 2594 final View[] children = mChildren; 2595 final int count = mChildrenCount; 2596 for (int i = 0; i < count; i++) { 2597 children[i].setDrawingCacheEnabled(enabled); 2598 } 2599 } 2600 } 2601 2602 @Override 2603 protected void onAnimationStart() { 2604 super.onAnimationStart(); 2605 2606 // When this ViewGroup's animation starts, build the cache for the children 2607 if ((mGroupFlags & FLAG_ANIMATION_CACHE) == FLAG_ANIMATION_CACHE) { 2608 final int count = mChildrenCount; 2609 final View[] children = mChildren; 2610 final boolean buildCache = !isHardwareAccelerated(); 2611 2612 for (int i = 0; i < count; i++) { 2613 final View child = children[i]; 2614 if ((child.mViewFlags & VISIBILITY_MASK) == VISIBLE) { 2615 child.setDrawingCacheEnabled(true); 2616 if (buildCache) { 2617 child.buildDrawingCache(true); 2618 } 2619 } 2620 } 2621 2622 mGroupFlags |= FLAG_CHILDREN_DRAWN_WITH_CACHE; 2623 } 2624 } 2625 2626 @Override 2627 protected void onAnimationEnd() { 2628 super.onAnimationEnd(); 2629 2630 // When this ViewGroup's animation ends, destroy the cache of the children 2631 if ((mGroupFlags & FLAG_ANIMATION_CACHE) == FLAG_ANIMATION_CACHE) { 2632 mGroupFlags &= ~FLAG_CHILDREN_DRAWN_WITH_CACHE; 2633 2634 if ((mPersistentDrawingCache & PERSISTENT_ANIMATION_CACHE) == 0) { 2635 setChildrenDrawingCacheEnabled(false); 2636 } 2637 } 2638 } 2639 2640 @Override 2641 Bitmap createSnapshot(Bitmap.Config quality, int backgroundColor, boolean skipChildren) { 2642 int count = mChildrenCount; 2643 int[] visibilities = null; 2644 2645 if (skipChildren) { 2646 visibilities = new int[count]; 2647 for (int i = 0; i < count; i++) { 2648 View child = getChildAt(i); 2649 visibilities[i] = child.getVisibility(); 2650 if (visibilities[i] == View.VISIBLE) { 2651 child.setVisibility(INVISIBLE); 2652 } 2653 } 2654 } 2655 2656 Bitmap b = super.createSnapshot(quality, backgroundColor, skipChildren); 2657 2658 if (skipChildren) { 2659 for (int i = 0; i < count; i++) { 2660 getChildAt(i).setVisibility(visibilities[i]); 2661 } 2662 } 2663 2664 return b; 2665 } 2666 2667 private static void drawRect(Canvas canvas, int x1, int y1, int x2, int y2, int color) { 2668 Paint paint = getDebugPaint(); 2669 paint.setColor(color); 2670 2671 canvas.drawLines(getDebugLines(x1, y1, x2, y2), paint); 2672 } 2673 2674 /** 2675 * @hide 2676 */ 2677 protected void onDebugDrawMargins(Canvas canvas) { 2678 for (int i = 0; i < getChildCount(); i++) { 2679 View c = getChildAt(i); 2680 c.getLayoutParams().onDebugDraw(c, canvas); 2681 } 2682 } 2683 2684 /** 2685 * @hide 2686 */ 2687 protected void onDebugDraw(Canvas canvas) { 2688 // Draw optical bounds 2689 if (getLayoutMode() == OPTICAL_BOUNDS) { 2690 for (int i = 0; i < getChildCount(); i++) { 2691 View c = getChildAt(i); 2692 Insets insets = c.getOpticalInsets(); 2693 drawRect(canvas, 2694 c.getLeft() + insets.left, 2695 c.getTop() + insets.top, 2696 c.getRight() - insets.right, 2697 c.getBottom() - insets.bottom, Color.RED); 2698 } 2699 } 2700 2701 // Draw margins 2702 onDebugDrawMargins(canvas); 2703 2704 // Draw bounds 2705 for (int i = 0; i < getChildCount(); i++) { 2706 View c = getChildAt(i); 2707 drawRect(canvas, c.getLeft(), c.getTop(), c.getRight(), c.getBottom(), Color.BLUE); 2708 } 2709 } 2710 2711 /** 2712 * {@inheritDoc} 2713 */ 2714 @Override 2715 protected void dispatchDraw(Canvas canvas) { 2716 final int count = mChildrenCount; 2717 final View[] children = mChildren; 2718 int flags = mGroupFlags; 2719 2720 if ((flags & FLAG_RUN_ANIMATION) != 0 && canAnimate()) { 2721 final boolean cache = (mGroupFlags & FLAG_ANIMATION_CACHE) == FLAG_ANIMATION_CACHE; 2722 2723 final boolean buildCache = !isHardwareAccelerated(); 2724 for (int i = 0; i < count; i++) { 2725 final View child = children[i]; 2726 if ((child.mViewFlags & VISIBILITY_MASK) == VISIBLE) { 2727 final LayoutParams params = child.getLayoutParams(); 2728 attachLayoutAnimationParameters(child, params, i, count); 2729 bindLayoutAnimation(child); 2730 if (cache) { 2731 child.setDrawingCacheEnabled(true); 2732 if (buildCache) { 2733 child.buildDrawingCache(true); 2734 } 2735 } 2736 } 2737 } 2738 2739 final LayoutAnimationController controller = mLayoutAnimationController; 2740 if (controller.willOverlap()) { 2741 mGroupFlags |= FLAG_OPTIMIZE_INVALIDATE; 2742 } 2743 2744 controller.start(); 2745 2746 mGroupFlags &= ~FLAG_RUN_ANIMATION; 2747 mGroupFlags &= ~FLAG_ANIMATION_DONE; 2748 2749 if (cache) { 2750 mGroupFlags |= FLAG_CHILDREN_DRAWN_WITH_CACHE; 2751 } 2752 2753 if (mAnimationListener != null) { 2754 mAnimationListener.onAnimationStart(controller.getAnimation()); 2755 } 2756 } 2757 2758 int saveCount = 0; 2759 final boolean clipToPadding = (flags & CLIP_TO_PADDING_MASK) == CLIP_TO_PADDING_MASK; 2760 if (clipToPadding) { 2761 saveCount = canvas.save(); 2762 canvas.clipRect(mScrollX + mPaddingLeft, mScrollY + mPaddingTop, 2763 mScrollX + mRight - mLeft - mPaddingRight, 2764 mScrollY + mBottom - mTop - mPaddingBottom); 2765 2766 } 2767 2768 // We will draw our child's animation, let's reset the flag 2769 mPrivateFlags &= ~DRAW_ANIMATION; 2770 mGroupFlags &= ~FLAG_INVALIDATE_REQUIRED; 2771 2772 boolean more = false; 2773 final long drawingTime = getDrawingTime(); 2774 2775 if ((flags & FLAG_USE_CHILD_DRAWING_ORDER) == 0) { 2776 for (int i = 0; i < count; i++) { 2777 final View child = children[i]; 2778 if ((child.mViewFlags & VISIBILITY_MASK) == VISIBLE || child.getAnimation() != null) { 2779 more |= drawChild(canvas, child, drawingTime); 2780 } 2781 } 2782 } else { 2783 for (int i = 0; i < count; i++) { 2784 final View child = children[getChildDrawingOrder(count, i)]; 2785 if ((child.mViewFlags & VISIBILITY_MASK) == VISIBLE || child.getAnimation() != null) { 2786 more |= drawChild(canvas, child, drawingTime); 2787 } 2788 } 2789 } 2790 2791 // Draw any disappearing views that have animations 2792 if (mDisappearingChildren != null) { 2793 final ArrayList<View> disappearingChildren = mDisappearingChildren; 2794 final int disappearingCount = disappearingChildren.size() - 1; 2795 // Go backwards -- we may delete as animations finish 2796 for (int i = disappearingCount; i >= 0; i--) { 2797 final View child = disappearingChildren.get(i); 2798 more |= drawChild(canvas, child, drawingTime); 2799 } 2800 } 2801 2802 if (debugDraw()) { 2803 onDebugDraw(canvas); 2804 } 2805 2806 if (clipToPadding) { 2807 canvas.restoreToCount(saveCount); 2808 } 2809 2810 // mGroupFlags might have been updated by drawChild() 2811 flags = mGroupFlags; 2812 2813 if ((flags & FLAG_INVALIDATE_REQUIRED) == FLAG_INVALIDATE_REQUIRED) { 2814 invalidate(true); 2815 } 2816 2817 if ((flags & FLAG_ANIMATION_DONE) == 0 && (flags & FLAG_NOTIFY_ANIMATION_LISTENER) == 0 && 2818 mLayoutAnimationController.isDone() && !more) { 2819 // We want to erase the drawing cache and notify the listener after the 2820 // next frame is drawn because one extra invalidate() is caused by 2821 // drawChild() after the animation is over 2822 mGroupFlags |= FLAG_NOTIFY_ANIMATION_LISTENER; 2823 final Runnable end = new Runnable() { 2824 public void run() { 2825 notifyAnimationListener(); 2826 } 2827 }; 2828 post(end); 2829 } 2830 } 2831 2832 /** 2833 * Returns the index of the child to draw for this iteration. Override this 2834 * if you want to change the drawing order of children. By default, it 2835 * returns i. 2836 * <p> 2837 * NOTE: In order for this method to be called, you must enable child ordering 2838 * first by calling {@link #setChildrenDrawingOrderEnabled(boolean)}. 2839 * 2840 * @param i The current iteration. 2841 * @return The index of the child to draw this iteration. 2842 * 2843 * @see #setChildrenDrawingOrderEnabled(boolean) 2844 * @see #isChildrenDrawingOrderEnabled() 2845 */ 2846 protected int getChildDrawingOrder(int childCount, int i) { 2847 return i; 2848 } 2849 2850 private void notifyAnimationListener() { 2851 mGroupFlags &= ~FLAG_NOTIFY_ANIMATION_LISTENER; 2852 mGroupFlags |= FLAG_ANIMATION_DONE; 2853 2854 if (mAnimationListener != null) { 2855 final Runnable end = new Runnable() { 2856 public void run() { 2857 mAnimationListener.onAnimationEnd(mLayoutAnimationController.getAnimation()); 2858 } 2859 }; 2860 post(end); 2861 } 2862 2863 if ((mGroupFlags & FLAG_ANIMATION_CACHE) == FLAG_ANIMATION_CACHE) { 2864 mGroupFlags &= ~FLAG_CHILDREN_DRAWN_WITH_CACHE; 2865 if ((mPersistentDrawingCache & PERSISTENT_ANIMATION_CACHE) == 0) { 2866 setChildrenDrawingCacheEnabled(false); 2867 } 2868 } 2869 2870 invalidate(true); 2871 } 2872 2873 /** 2874 * This method is used to cause children of this ViewGroup to restore or recreate their 2875 * display lists. It is called by getDisplayList() when the parent ViewGroup does not need 2876 * to recreate its own display list, which would happen if it went through the normal 2877 * draw/dispatchDraw mechanisms. 2878 * 2879 * @hide 2880 */ 2881 @Override 2882 protected void dispatchGetDisplayList() { 2883 final int count = mChildrenCount; 2884 final View[] children = mChildren; 2885 for (int i = 0; i < count; i++) { 2886 final View child = children[i]; 2887 if (((child.mViewFlags & VISIBILITY_MASK) == VISIBLE || child.getAnimation() != null) && 2888 child.hasStaticLayer()) { 2889 child.mRecreateDisplayList = (child.mPrivateFlags & INVALIDATED) == INVALIDATED; 2890 child.mPrivateFlags &= ~INVALIDATED; 2891 child.getDisplayList(); 2892 child.mRecreateDisplayList = false; 2893 } 2894 } 2895 } 2896 2897 /** 2898 * Draw one child of this View Group. This method is responsible for getting 2899 * the canvas in the right state. This includes clipping, translating so 2900 * that the child's scrolled origin is at 0, 0, and applying any animation 2901 * transformations. 2902 * 2903 * @param canvas The canvas on which to draw the child 2904 * @param child Who to draw 2905 * @param drawingTime The time at which draw is occurring 2906 * @return True if an invalidate() was issued 2907 */ 2908 protected boolean drawChild(Canvas canvas, View child, long drawingTime) { 2909 return child.draw(canvas, this, drawingTime); 2910 } 2911 2912 /** 2913 * By default, children are clipped to their bounds before drawing. This 2914 * allows view groups to override this behavior for animations, etc. 2915 * 2916 * @param clipChildren true to clip children to their bounds, 2917 * false otherwise 2918 * @attr ref android.R.styleable#ViewGroup_clipChildren 2919 */ 2920 public void setClipChildren(boolean clipChildren) { 2921 boolean previousValue = (mGroupFlags & FLAG_CLIP_CHILDREN) == FLAG_CLIP_CHILDREN; 2922 if (clipChildren != previousValue) { 2923 setBooleanFlag(FLAG_CLIP_CHILDREN, clipChildren); 2924 for (int i = 0; i < mChildrenCount; ++i) { 2925 View child = getChildAt(i); 2926 if (child.mDisplayList != null) { 2927 child.mDisplayList.setClipChildren(clipChildren); 2928 } 2929 } 2930 } 2931 } 2932 2933 /** 2934 * By default, children are clipped to the padding of the ViewGroup. This 2935 * allows view groups to override this behavior 2936 * 2937 * @param clipToPadding true to clip children to the padding of the 2938 * group, false otherwise 2939 * @attr ref android.R.styleable#ViewGroup_clipToPadding 2940 */ 2941 public void setClipToPadding(boolean clipToPadding) { 2942 setBooleanFlag(FLAG_CLIP_TO_PADDING, clipToPadding); 2943 } 2944 2945 /** 2946 * {@inheritDoc} 2947 */ 2948 @Override 2949 public void dispatchSetSelected(boolean selected) { 2950 final View[] children = mChildren; 2951 final int count = mChildrenCount; 2952 for (int i = 0; i < count; i++) { 2953 children[i].setSelected(selected); 2954 } 2955 } 2956 2957 /** 2958 * {@inheritDoc} 2959 */ 2960 @Override 2961 public void dispatchSetActivated(boolean activated) { 2962 final View[] children = mChildren; 2963 final int count = mChildrenCount; 2964 for (int i = 0; i < count; i++) { 2965 children[i].setActivated(activated); 2966 } 2967 } 2968 2969 @Override 2970 protected void dispatchSetPressed(boolean pressed) { 2971 final View[] children = mChildren; 2972 final int count = mChildrenCount; 2973 for (int i = 0; i < count; i++) { 2974 final View child = children[i]; 2975 // Children that are clickable on their own should not 2976 // show a pressed state when their parent view does. 2977 // Clearing a pressed state always propagates. 2978 if (!pressed || (!child.isClickable() && !child.isLongClickable())) { 2979 child.setPressed(pressed); 2980 } 2981 } 2982 } 2983 2984 /** 2985 * When this property is set to true, this ViewGroup supports static transformations on 2986 * children; this causes 2987 * {@link #getChildStaticTransformation(View, android.view.animation.Transformation)} to be 2988 * invoked when a child is drawn. 2989 * 2990 * Any subclass overriding 2991 * {@link #getChildStaticTransformation(View, android.view.animation.Transformation)} should 2992 * set this property to true. 2993 * 2994 * @param enabled True to enable static transformations on children, false otherwise. 2995 * 2996 * @see #getChildStaticTransformation(View, android.view.animation.Transformation) 2997 */ 2998 protected void setStaticTransformationsEnabled(boolean enabled) { 2999 setBooleanFlag(FLAG_SUPPORT_STATIC_TRANSFORMATIONS, enabled); 3000 } 3001 3002 /** 3003 * Sets <code>t</code> to be the static transformation of the child, if set, returning a 3004 * boolean to indicate whether a static transform was set. The default implementation 3005 * simply returns <code>false</code>; subclasses may override this method for different 3006 * behavior. {@link #setStaticTransformationsEnabled(boolean)} must be set to true 3007 * for this method to be called. 3008 * 3009 * @param child The child view whose static transform is being requested 3010 * @param t The Transformation which will hold the result 3011 * @return true if the transformation was set, false otherwise 3012 * @see #setStaticTransformationsEnabled(boolean) 3013 */ 3014 protected boolean getChildStaticTransformation(View child, Transformation t) { 3015 return false; 3016 } 3017 3018 /** 3019 * {@hide} 3020 */ 3021 @Override 3022 protected View findViewTraversal(int id) { 3023 if (id == mID) { 3024 return this; 3025 } 3026 3027 final View[] where = mChildren; 3028 final int len = mChildrenCount; 3029 3030 for (int i = 0; i < len; i++) { 3031 View v = where[i]; 3032 3033 if ((v.mPrivateFlags & IS_ROOT_NAMESPACE) == 0) { 3034 v = v.findViewById(id); 3035 3036 if (v != null) { 3037 return v; 3038 } 3039 } 3040 } 3041 3042 return null; 3043 } 3044 3045 /** 3046 * {@hide} 3047 */ 3048 @Override 3049 protected View findViewWithTagTraversal(Object tag) { 3050 if (tag != null && tag.equals(mTag)) { 3051 return this; 3052 } 3053 3054 final View[] where = mChildren; 3055 final int len = mChildrenCount; 3056 3057 for (int i = 0; i < len; i++) { 3058 View v = where[i]; 3059 3060 if ((v.mPrivateFlags & IS_ROOT_NAMESPACE) == 0) { 3061 v = v.findViewWithTag(tag); 3062 3063 if (v != null) { 3064 return v; 3065 } 3066 } 3067 } 3068 3069 return null; 3070 } 3071 3072 /** 3073 * {@hide} 3074 */ 3075 @Override 3076 protected View findViewByPredicateTraversal(Predicate<View> predicate, View childToSkip) { 3077 if (predicate.apply(this)) { 3078 return this; 3079 } 3080 3081 final View[] where = mChildren; 3082 final int len = mChildrenCount; 3083 3084 for (int i = 0; i < len; i++) { 3085 View v = where[i]; 3086 3087 if (v != childToSkip && (v.mPrivateFlags & IS_ROOT_NAMESPACE) == 0) { 3088 v = v.findViewByPredicate(predicate); 3089 3090 if (v != null) { 3091 return v; 3092 } 3093 } 3094 } 3095 3096 return null; 3097 } 3098 3099 /** 3100 * <p>Adds a child view. If no layout parameters are already set on the child, the 3101 * default parameters for this ViewGroup are set on the child.</p> 3102 * 3103 * <p><strong>Note:</strong> do not invoke this method from 3104 * {@link #draw(android.graphics.Canvas)}, {@link #onDraw(android.graphics.Canvas)}, 3105 * {@link #dispatchDraw(android.graphics.Canvas)} or any related method.</p> 3106 * 3107 * @param child the child view to add 3108 * 3109 * @see #generateDefaultLayoutParams() 3110 */ 3111 public void addView(View child) { 3112 addView(child, -1); 3113 } 3114 3115 /** 3116 * Adds a child view. If no layout parameters are already set on the child, the 3117 * default parameters for this ViewGroup are set on the child. 3118 * 3119 * <p><strong>Note:</strong> do not invoke this method from 3120 * {@link #draw(android.graphics.Canvas)}, {@link #onDraw(android.graphics.Canvas)}, 3121 * {@link #dispatchDraw(android.graphics.Canvas)} or any related method.</p> 3122 * 3123 * @param child the child view to add 3124 * @param index the position at which to add the child 3125 * 3126 * @see #generateDefaultLayoutParams() 3127 */ 3128 public void addView(View child, int index) { 3129 LayoutParams params = child.getLayoutParams(); 3130 if (params == null) { 3131 params = generateDefaultLayoutParams(); 3132 if (params == null) { 3133 throw new IllegalArgumentException("generateDefaultLayoutParams() cannot return null"); 3134 } 3135 } 3136 addView(child, index, params); 3137 } 3138 3139 /** 3140 * Adds a child view with this ViewGroup's default layout parameters and the 3141 * specified width and height. 3142 * 3143 * <p><strong>Note:</strong> do not invoke this method from 3144 * {@link #draw(android.graphics.Canvas)}, {@link #onDraw(android.graphics.Canvas)}, 3145 * {@link #dispatchDraw(android.graphics.Canvas)} or any related method.</p> 3146 * 3147 * @param child the child view to add 3148 */ 3149 public void addView(View child, int width, int height) { 3150 final LayoutParams params = generateDefaultLayoutParams(); 3151 params.width = width; 3152 params.height = height; 3153 addView(child, -1, params); 3154 } 3155 3156 /** 3157 * Adds a child view with the specified layout parameters. 3158 * 3159 * <p><strong>Note:</strong> do not invoke this method from 3160 * {@link #draw(android.graphics.Canvas)}, {@link #onDraw(android.graphics.Canvas)}, 3161 * {@link #dispatchDraw(android.graphics.Canvas)} or any related method.</p> 3162 * 3163 * @param child the child view to add 3164 * @param params the layout parameters to set on the child 3165 */ 3166 public void addView(View child, LayoutParams params) { 3167 addView(child, -1, params); 3168 } 3169 3170 /** 3171 * Adds a child view with the specified layout parameters. 3172 * 3173 * <p><strong>Note:</strong> do not invoke this method from 3174 * {@link #draw(android.graphics.Canvas)}, {@link #onDraw(android.graphics.Canvas)}, 3175 * {@link #dispatchDraw(android.graphics.Canvas)} or any related method.</p> 3176 * 3177 * @param child the child view to add 3178 * @param index the position at which to add the child 3179 * @param params the layout parameters to set on the child 3180 */ 3181 public void addView(View child, int index, LayoutParams params) { 3182 if (DBG) { 3183 System.out.println(this + " addView"); 3184 } 3185 3186 // addViewInner() will call child.requestLayout() when setting the new LayoutParams 3187 // therefore, we call requestLayout() on ourselves before, so that the child's request 3188 // will be blocked at our level 3189 requestLayout(); 3190 invalidate(true); 3191 addViewInner(child, index, params, false); 3192 } 3193 3194 /** 3195 * {@inheritDoc} 3196 */ 3197 public void updateViewLayout(View view, ViewGroup.LayoutParams params) { 3198 if (!checkLayoutParams(params)) { 3199 throw new IllegalArgumentException("Invalid LayoutParams supplied to " + this); 3200 } 3201 if (view.mParent != this) { 3202 throw new IllegalArgumentException("Given view not a child of " + this); 3203 } 3204 view.setLayoutParams(params); 3205 } 3206 3207 /** 3208 * {@inheritDoc} 3209 */ 3210 protected boolean checkLayoutParams(ViewGroup.LayoutParams p) { 3211 return p != null; 3212 } 3213 3214 /** 3215 * Interface definition for a callback to be invoked when the hierarchy 3216 * within this view changed. The hierarchy changes whenever a child is added 3217 * to or removed from this view. 3218 */ 3219 public interface OnHierarchyChangeListener { 3220 /** 3221 * Called when a new child is added to a parent view. 3222 * 3223 * @param parent the view in which a child was added 3224 * @param child the new child view added in the hierarchy 3225 */ 3226 void onChildViewAdded(View parent, View child); 3227 3228 /** 3229 * Called when a child is removed from a parent view. 3230 * 3231 * @param parent the view from which the child was removed 3232 * @param child the child removed from the hierarchy 3233 */ 3234 void onChildViewRemoved(View parent, View child); 3235 } 3236 3237 /** 3238 * Register a callback to be invoked when a child is added to or removed 3239 * from this view. 3240 * 3241 * @param listener the callback to invoke on hierarchy change 3242 */ 3243 public void setOnHierarchyChangeListener(OnHierarchyChangeListener listener) { 3244 mOnHierarchyChangeListener = listener; 3245 } 3246 3247 /** 3248 * @hide 3249 */ 3250 protected void onViewAdded(View child) { 3251 if (mOnHierarchyChangeListener != null) { 3252 mOnHierarchyChangeListener.onChildViewAdded(this, child); 3253 } 3254 } 3255 3256 /** 3257 * @hide 3258 */ 3259 protected void onViewRemoved(View child) { 3260 if (mOnHierarchyChangeListener != null) { 3261 mOnHierarchyChangeListener.onChildViewRemoved(this, child); 3262 } 3263 } 3264 3265 /** 3266 * Adds a view during layout. This is useful if in your onLayout() method, 3267 * you need to add more views (as does the list view for example). 3268 * 3269 * If index is negative, it means put it at the end of the list. 3270 * 3271 * @param child the view to add to the group 3272 * @param index the index at which the child must be added 3273 * @param params the layout parameters to associate with the child 3274 * @return true if the child was added, false otherwise 3275 */ 3276 protected boolean addViewInLayout(View child, int index, LayoutParams params) { 3277 return addViewInLayout(child, index, params, false); 3278 } 3279 3280 /** 3281 * Adds a view during layout. This is useful if in your onLayout() method, 3282 * you need to add more views (as does the list view for example). 3283 * 3284 * If index is negative, it means put it at the end of the list. 3285 * 3286 * @param child the view to add to the group 3287 * @param index the index at which the child must be added 3288 * @param params the layout parameters to associate with the child 3289 * @param preventRequestLayout if true, calling this method will not trigger a 3290 * layout request on child 3291 * @return true if the child was added, false otherwise 3292 */ 3293 protected boolean addViewInLayout(View child, int index, LayoutParams params, 3294 boolean preventRequestLayout) { 3295 child.mParent = null; 3296 addViewInner(child, index, params, preventRequestLayout); 3297 child.mPrivateFlags = (child.mPrivateFlags & ~DIRTY_MASK) | DRAWN; 3298 return true; 3299 } 3300 3301 /** 3302 * Prevents the specified child to be laid out during the next layout pass. 3303 * 3304 * @param child the child on which to perform the cleanup 3305 */ 3306 protected void cleanupLayoutState(View child) { 3307 child.mPrivateFlags &= ~View.FORCE_LAYOUT; 3308 } 3309 3310 private void addViewInner(View child, int index, LayoutParams params, 3311 boolean preventRequestLayout) { 3312 3313 if (mTransition != null) { 3314 // Don't prevent other add transitions from completing, but cancel remove 3315 // transitions to let them complete the process before we add to the container 3316 mTransition.cancel(LayoutTransition.DISAPPEARING); 3317 } 3318 3319 if (child.getParent() != null) { 3320 throw new IllegalStateException("The specified child already has a parent. " + 3321 "You must call removeView() on the child's parent first."); 3322 } 3323 3324 if (mTransition != null) { 3325 mTransition.addChild(this, child); 3326 } 3327 3328 if (!checkLayoutParams(params)) { 3329 params = generateLayoutParams(params); 3330 } 3331 3332 if (preventRequestLayout) { 3333 child.mLayoutParams = params; 3334 } else { 3335 child.setLayoutParams(params); 3336 } 3337 3338 if (index < 0) { 3339 index = mChildrenCount; 3340 } 3341 3342 addInArray(child, index); 3343 3344 // tell our children 3345 if (preventRequestLayout) { 3346 child.assignParent(this); 3347 } else { 3348 child.mParent = this; 3349 } 3350 3351 if (child.hasFocus()) { 3352 requestChildFocus(child, child.findFocus()); 3353 } 3354 3355 AttachInfo ai = mAttachInfo; 3356 if (ai != null && (mGroupFlags & FLAG_PREVENT_DISPATCH_ATTACHED_TO_WINDOW) == 0) { 3357 boolean lastKeepOn = ai.mKeepScreenOn; 3358 ai.mKeepScreenOn = false; 3359 child.dispatchAttachedToWindow(mAttachInfo, (mViewFlags&VISIBILITY_MASK)); 3360 if (ai.mKeepScreenOn) { 3361 needGlobalAttributesUpdate(true); 3362 } 3363 ai.mKeepScreenOn = lastKeepOn; 3364 } 3365 3366 onViewAdded(child); 3367 3368 if ((child.mViewFlags & DUPLICATE_PARENT_STATE) == DUPLICATE_PARENT_STATE) { 3369 mGroupFlags |= FLAG_NOTIFY_CHILDREN_ON_DRAWABLE_STATE_CHANGE; 3370 } 3371 3372 if (child.hasTransientState()) { 3373 childHasTransientStateChanged(child, true); 3374 } 3375 } 3376 3377 private void addInArray(View child, int index) { 3378 View[] children = mChildren; 3379 final int count = mChildrenCount; 3380 final int size = children.length; 3381 if (index == count) { 3382 if (size == count) { 3383 mChildren = new View[size + ARRAY_CAPACITY_INCREMENT]; 3384 System.arraycopy(children, 0, mChildren, 0, size); 3385 children = mChildren; 3386 } 3387 children[mChildrenCount++] = child; 3388 } else if (index < count) { 3389 if (size == count) { 3390 mChildren = new View[size + ARRAY_CAPACITY_INCREMENT]; 3391 System.arraycopy(children, 0, mChildren, 0, index); 3392 System.arraycopy(children, index, mChildren, index + 1, count - index); 3393 children = mChildren; 3394 } else { 3395 System.arraycopy(children, index, children, index + 1, count - index); 3396 } 3397 children[index] = child; 3398 mChildrenCount++; 3399 if (mLastTouchDownIndex >= index) { 3400 mLastTouchDownIndex++; 3401 } 3402 } else { 3403 throw new IndexOutOfBoundsException("index=" + index + " count=" + count); 3404 } 3405 } 3406 3407 // This method also sets the child's mParent to null 3408 private void removeFromArray(int index) { 3409 final View[] children = mChildren; 3410 if (!(mTransitioningViews != null && mTransitioningViews.contains(children[index]))) { 3411 children[index].mParent = null; 3412 } 3413 final int count = mChildrenCount; 3414 if (index == count - 1) { 3415 children[--mChildrenCount] = null; 3416 } else if (index >= 0 && index < count) { 3417 System.arraycopy(children, index + 1, children, index, count - index - 1); 3418 children[--mChildrenCount] = null; 3419 } else { 3420 throw new IndexOutOfBoundsException(); 3421 } 3422 if (mLastTouchDownIndex == index) { 3423 mLastTouchDownTime = 0; 3424 mLastTouchDownIndex = -1; 3425 } else if (mLastTouchDownIndex > index) { 3426 mLastTouchDownIndex--; 3427 } 3428 } 3429 3430 // This method also sets the children's mParent to null 3431 private void removeFromArray(int start, int count) { 3432 final View[] children = mChildren; 3433 final int childrenCount = mChildrenCount; 3434 3435 start = Math.max(0, start); 3436 final int end = Math.min(childrenCount, start + count); 3437 3438 if (start == end) { 3439 return; 3440 } 3441 3442 if (end == childrenCount) { 3443 for (int i = start; i < end; i++) { 3444 children[i].mParent = null; 3445 children[i] = null; 3446 } 3447 } else { 3448 for (int i = start; i < end; i++) { 3449 children[i].mParent = null; 3450 } 3451 3452 // Since we're looping above, we might as well do the copy, but is arraycopy() 3453 // faster than the extra 2 bounds checks we would do in the loop? 3454 System.arraycopy(children, end, children, start, childrenCount - end); 3455 3456 for (int i = childrenCount - (end - start); i < childrenCount; i++) { 3457 children[i] = null; 3458 } 3459 } 3460 3461 mChildrenCount -= (end - start); 3462 } 3463 3464 private void bindLayoutAnimation(View child) { 3465 Animation a = mLayoutAnimationController.getAnimationForView(child); 3466 child.setAnimation(a); 3467 } 3468 3469 /** 3470 * Subclasses should override this method to set layout animation 3471 * parameters on the supplied child. 3472 * 3473 * @param child the child to associate with animation parameters 3474 * @param params the child's layout parameters which hold the animation 3475 * parameters 3476 * @param index the index of the child in the view group 3477 * @param count the number of children in the view group 3478 */ 3479 protected void attachLayoutAnimationParameters(View child, 3480 LayoutParams params, int index, int count) { 3481 LayoutAnimationController.AnimationParameters animationParams = 3482 params.layoutAnimationParameters; 3483 if (animationParams == null) { 3484 animationParams = new LayoutAnimationController.AnimationParameters(); 3485 params.layoutAnimationParameters = animationParams; 3486 } 3487 3488 animationParams.count = count; 3489 animationParams.index = index; 3490 } 3491 3492 /** 3493 * {@inheritDoc} 3494 * 3495 * <p><strong>Note:</strong> do not invoke this method from 3496 * {@link #draw(android.graphics.Canvas)}, {@link #onDraw(android.graphics.Canvas)}, 3497 * {@link #dispatchDraw(android.graphics.Canvas)} or any related method.</p> 3498 */ 3499 public void removeView(View view) { 3500 removeViewInternal(view); 3501 requestLayout(); 3502 invalidate(true); 3503 } 3504 3505 /** 3506 * Removes a view during layout. This is useful if in your onLayout() method, 3507 * you need to remove more views. 3508 * 3509 * <p><strong>Note:</strong> do not invoke this method from 3510 * {@link #draw(android.graphics.Canvas)}, {@link #onDraw(android.graphics.Canvas)}, 3511 * {@link #dispatchDraw(android.graphics.Canvas)} or any related method.</p> 3512 * 3513 * @param view the view to remove from the group 3514 */ 3515 public void removeViewInLayout(View view) { 3516 removeViewInternal(view); 3517 } 3518 3519 /** 3520 * Removes a range of views during layout. This is useful if in your onLayout() method, 3521 * you need to remove more views. 3522 * 3523 * <p><strong>Note:</strong> do not invoke this method from 3524 * {@link #draw(android.graphics.Canvas)}, {@link #onDraw(android.graphics.Canvas)}, 3525 * {@link #dispatchDraw(android.graphics.Canvas)} or any related method.</p> 3526 * 3527 * @param start the index of the first view to remove from the group 3528 * @param count the number of views to remove from the group 3529 */ 3530 public void removeViewsInLayout(int start, int count) { 3531 removeViewsInternal(start, count); 3532 } 3533 3534 /** 3535 * Removes the view at the specified position in the group. 3536 * 3537 * <p><strong>Note:</strong> do not invoke this method from 3538 * {@link #draw(android.graphics.Canvas)}, {@link #onDraw(android.graphics.Canvas)}, 3539 * {@link #dispatchDraw(android.graphics.Canvas)} or any related method.</p> 3540 * 3541 * @param index the position in the group of the view to remove 3542 */ 3543 public void removeViewAt(int index) { 3544 removeViewInternal(index, getChildAt(index)); 3545 requestLayout(); 3546 invalidate(true); 3547 } 3548 3549 /** 3550 * Removes the specified range of views from the group. 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 * @param start the first position in the group of the range of views to remove 3557 * @param count the number of views to remove 3558 */ 3559 public void removeViews(int start, int count) { 3560 removeViewsInternal(start, count); 3561 requestLayout(); 3562 invalidate(true); 3563 } 3564 3565 private void removeViewInternal(View view) { 3566 final int index = indexOfChild(view); 3567 if (index >= 0) { 3568 removeViewInternal(index, view); 3569 } 3570 } 3571 3572 private void removeViewInternal(int index, View view) { 3573 3574 if (mTransition != null) { 3575 mTransition.removeChild(this, view); 3576 } 3577 3578 boolean clearChildFocus = false; 3579 if (view == mFocused) { 3580 view.unFocus(); 3581 clearChildFocus = true; 3582 } 3583 3584 view.clearAccessibilityFocus(); 3585 3586 cancelTouchTarget(view); 3587 cancelHoverTarget(view); 3588 3589 if (view.getAnimation() != null || 3590 (mTransitioningViews != null && mTransitioningViews.contains(view))) { 3591 addDisappearingView(view); 3592 } else if (view.mAttachInfo != null) { 3593 view.dispatchDetachedFromWindow(); 3594 } 3595 3596 if (view.hasTransientState()) { 3597 childHasTransientStateChanged(view, false); 3598 } 3599 3600 onViewRemoved(view); 3601 3602 needGlobalAttributesUpdate(false); 3603 3604 removeFromArray(index); 3605 3606 if (clearChildFocus) { 3607 clearChildFocus(view); 3608 ensureInputFocusOnFirstFocusable(); 3609 } 3610 3611 if (view.isAccessibilityFocused()) { 3612 view.clearAccessibilityFocus(); 3613 } 3614 } 3615 3616 /** 3617 * Sets the LayoutTransition object for this ViewGroup. If the LayoutTransition object is 3618 * not null, changes in layout which occur because of children being added to or removed from 3619 * the ViewGroup will be animated according to the animations defined in that LayoutTransition 3620 * object. By default, the transition object is null (so layout changes are not animated). 3621 * 3622 * @param transition The LayoutTransition object that will animated changes in layout. A value 3623 * of <code>null</code> means no transition will run on layout changes. 3624 * @attr ref android.R.styleable#ViewGroup_animateLayoutChanges 3625 */ 3626 public void setLayoutTransition(LayoutTransition transition) { 3627 if (mTransition != null) { 3628 mTransition.removeTransitionListener(mLayoutTransitionListener); 3629 } 3630 mTransition = transition; 3631 if (mTransition != null) { 3632 mTransition.addTransitionListener(mLayoutTransitionListener); 3633 } 3634 } 3635 3636 /** 3637 * Gets the LayoutTransition object for this ViewGroup. If the LayoutTransition object is 3638 * not null, changes in layout which occur because of children being added to or removed from 3639 * the ViewGroup will be animated according to the animations defined in that LayoutTransition 3640 * object. By default, the transition object is null (so layout changes are not animated). 3641 * 3642 * @return LayoutTranstion The LayoutTransition object that will animated changes in layout. 3643 * A value of <code>null</code> means no transition will run on layout changes. 3644 */ 3645 public LayoutTransition getLayoutTransition() { 3646 return mTransition; 3647 } 3648 3649 private void removeViewsInternal(int start, int count) { 3650 final View focused = mFocused; 3651 final boolean detach = mAttachInfo != null; 3652 View clearChildFocus = null; 3653 3654 final View[] children = mChildren; 3655 final int end = start + count; 3656 3657 for (int i = start; i < end; i++) { 3658 final View view = children[i]; 3659 3660 if (mTransition != null) { 3661 mTransition.removeChild(this, view); 3662 } 3663 3664 if (view == focused) { 3665 view.unFocus(); 3666 clearChildFocus = view; 3667 } 3668 3669 view.clearAccessibilityFocus(); 3670 3671 cancelTouchTarget(view); 3672 cancelHoverTarget(view); 3673 3674 if (view.getAnimation() != null || 3675 (mTransitioningViews != null && mTransitioningViews.contains(view))) { 3676 addDisappearingView(view); 3677 } else if (detach) { 3678 view.dispatchDetachedFromWindow(); 3679 } 3680 3681 if (view.hasTransientState()) { 3682 childHasTransientStateChanged(view, false); 3683 } 3684 3685 needGlobalAttributesUpdate(false); 3686 3687 onViewRemoved(view); 3688 } 3689 3690 removeFromArray(start, count); 3691 3692 if (clearChildFocus != null) { 3693 clearChildFocus(clearChildFocus); 3694 ensureInputFocusOnFirstFocusable(); 3695 } 3696 } 3697 3698 /** 3699 * Call this method to remove all child views from the 3700 * ViewGroup. 3701 * 3702 * <p><strong>Note:</strong> do not invoke this method from 3703 * {@link #draw(android.graphics.Canvas)}, {@link #onDraw(android.graphics.Canvas)}, 3704 * {@link #dispatchDraw(android.graphics.Canvas)} or any related method.</p> 3705 */ 3706 public void removeAllViews() { 3707 removeAllViewsInLayout(); 3708 requestLayout(); 3709 invalidate(true); 3710 } 3711 3712 /** 3713 * Called by a ViewGroup subclass to remove child views from itself, 3714 * when it must first know its size on screen before it can calculate how many 3715 * child views it will render. An example is a Gallery or a ListView, which 3716 * may "have" 50 children, but actually only render the number of children 3717 * that can currently fit inside the object on screen. Do not call 3718 * this method unless you are extending ViewGroup and understand the 3719 * view measuring and layout pipeline. 3720 * 3721 * <p><strong>Note:</strong> do not invoke this method from 3722 * {@link #draw(android.graphics.Canvas)}, {@link #onDraw(android.graphics.Canvas)}, 3723 * {@link #dispatchDraw(android.graphics.Canvas)} or any related method.</p> 3724 */ 3725 public void removeAllViewsInLayout() { 3726 final int count = mChildrenCount; 3727 if (count <= 0) { 3728 return; 3729 } 3730 3731 final View[] children = mChildren; 3732 mChildrenCount = 0; 3733 3734 final View focused = mFocused; 3735 final boolean detach = mAttachInfo != null; 3736 View clearChildFocus = null; 3737 3738 needGlobalAttributesUpdate(false); 3739 3740 for (int i = count - 1; i >= 0; i--) { 3741 final View view = children[i]; 3742 3743 if (mTransition != null) { 3744 mTransition.removeChild(this, view); 3745 } 3746 3747 if (view == focused) { 3748 view.unFocus(); 3749 clearChildFocus = view; 3750 } 3751 3752 view.clearAccessibilityFocus(); 3753 3754 cancelTouchTarget(view); 3755 cancelHoverTarget(view); 3756 3757 if (view.getAnimation() != null || 3758 (mTransitioningViews != null && mTransitioningViews.contains(view))) { 3759 addDisappearingView(view); 3760 } else if (detach) { 3761 view.dispatchDetachedFromWindow(); 3762 } 3763 3764 if (view.hasTransientState()) { 3765 childHasTransientStateChanged(view, false); 3766 } 3767 3768 onViewRemoved(view); 3769 3770 view.mParent = null; 3771 children[i] = null; 3772 } 3773 3774 if (clearChildFocus != null) { 3775 clearChildFocus(clearChildFocus); 3776 ensureInputFocusOnFirstFocusable(); 3777 } 3778 } 3779 3780 /** 3781 * Finishes the removal of a detached view. This method will dispatch the detached from 3782 * window event and notify the hierarchy change listener. 3783 * 3784 * @param child the child to be definitely removed from the view hierarchy 3785 * @param animate if true and the view has an animation, the view is placed in the 3786 * disappearing views list, otherwise, it is detached from the window 3787 * 3788 * @see #attachViewToParent(View, int, android.view.ViewGroup.LayoutParams) 3789 * @see #detachAllViewsFromParent() 3790 * @see #detachViewFromParent(View) 3791 * @see #detachViewFromParent(int) 3792 */ 3793 protected void removeDetachedView(View child, boolean animate) { 3794 if (mTransition != null) { 3795 mTransition.removeChild(this, child); 3796 } 3797 3798 if (child == mFocused) { 3799 child.clearFocus(); 3800 } 3801 3802 child.clearAccessibilityFocus(); 3803 3804 cancelTouchTarget(child); 3805 cancelHoverTarget(child); 3806 3807 if ((animate && child.getAnimation() != null) || 3808 (mTransitioningViews != null && mTransitioningViews.contains(child))) { 3809 addDisappearingView(child); 3810 } else if (child.mAttachInfo != null) { 3811 child.dispatchDetachedFromWindow(); 3812 } 3813 3814 if (child.hasTransientState()) { 3815 childHasTransientStateChanged(child, false); 3816 } 3817 3818 onViewRemoved(child); 3819 } 3820 3821 /** 3822 * Attaches a view to this view group. Attaching a view assigns this group as the parent, 3823 * sets the layout parameters and puts the view in the list of children so it can be retrieved 3824 * by calling {@link #getChildAt(int)}. 3825 * 3826 * This method should be called only for view which were detached from their parent. 3827 * 3828 * @param child the child to attach 3829 * @param index the index at which the child should be attached 3830 * @param params the layout parameters of the child 3831 * 3832 * @see #removeDetachedView(View, boolean) 3833 * @see #detachAllViewsFromParent() 3834 * @see #detachViewFromParent(View) 3835 * @see #detachViewFromParent(int) 3836 */ 3837 protected void attachViewToParent(View child, int index, LayoutParams params) { 3838 child.mLayoutParams = params; 3839 3840 if (index < 0) { 3841 index = mChildrenCount; 3842 } 3843 3844 addInArray(child, index); 3845 3846 child.mParent = this; 3847 child.mPrivateFlags = (child.mPrivateFlags & ~DIRTY_MASK & ~DRAWING_CACHE_VALID) | 3848 DRAWN | INVALIDATED; 3849 this.mPrivateFlags |= INVALIDATED; 3850 3851 if (child.hasFocus()) { 3852 requestChildFocus(child, child.findFocus()); 3853 } 3854 } 3855 3856 /** 3857 * Detaches a view from its parent. Detaching a view should be temporary and followed 3858 * either by a call to {@link #attachViewToParent(View, int, android.view.ViewGroup.LayoutParams)} 3859 * or a call to {@link #removeDetachedView(View, boolean)}. When a view is detached, 3860 * its parent is null and cannot be retrieved by a call to {@link #getChildAt(int)}. 3861 * 3862 * @param child the child to detach 3863 * 3864 * @see #detachViewFromParent(int) 3865 * @see #detachViewsFromParent(int, int) 3866 * @see #detachAllViewsFromParent() 3867 * @see #attachViewToParent(View, int, android.view.ViewGroup.LayoutParams) 3868 * @see #removeDetachedView(View, boolean) 3869 */ 3870 protected void detachViewFromParent(View child) { 3871 removeFromArray(indexOfChild(child)); 3872 } 3873 3874 /** 3875 * Detaches a view from its parent. Detaching a view should be temporary and followed 3876 * either by a call to {@link #attachViewToParent(View, int, android.view.ViewGroup.LayoutParams)} 3877 * or a call to {@link #removeDetachedView(View, boolean)}. When a view is detached, 3878 * its parent is null and cannot be retrieved by a call to {@link #getChildAt(int)}. 3879 * 3880 * @param index the index of the child to detach 3881 * 3882 * @see #detachViewFromParent(View) 3883 * @see #detachAllViewsFromParent() 3884 * @see #detachViewsFromParent(int, int) 3885 * @see #attachViewToParent(View, int, android.view.ViewGroup.LayoutParams) 3886 * @see #removeDetachedView(View, boolean) 3887 */ 3888 protected void detachViewFromParent(int index) { 3889 removeFromArray(index); 3890 } 3891 3892 /** 3893 * Detaches a range of view from their parent. Detaching a view should be temporary and followed 3894 * either by a call to {@link #attachViewToParent(View, int, android.view.ViewGroup.LayoutParams)} 3895 * or a call to {@link #removeDetachedView(View, boolean)}. When a view is detached, its 3896 * parent is null and cannot be retrieved by a call to {@link #getChildAt(int)}. 3897 * 3898 * @param start the first index of the childrend range to detach 3899 * @param count the number of children to detach 3900 * 3901 * @see #detachViewFromParent(View) 3902 * @see #detachViewFromParent(int) 3903 * @see #detachAllViewsFromParent() 3904 * @see #attachViewToParent(View, int, android.view.ViewGroup.LayoutParams) 3905 * @see #removeDetachedView(View, boolean) 3906 */ 3907 protected void detachViewsFromParent(int start, int count) { 3908 removeFromArray(start, count); 3909 } 3910 3911 /** 3912 * Detaches all views from the parent. Detaching a view should be temporary and followed 3913 * either by a call to {@link #attachViewToParent(View, int, android.view.ViewGroup.LayoutParams)} 3914 * or a call to {@link #removeDetachedView(View, boolean)}. When a view is detached, 3915 * its parent is null and cannot be retrieved by a call to {@link #getChildAt(int)}. 3916 * 3917 * @see #detachViewFromParent(View) 3918 * @see #detachViewFromParent(int) 3919 * @see #detachViewsFromParent(int, int) 3920 * @see #attachViewToParent(View, int, android.view.ViewGroup.LayoutParams) 3921 * @see #removeDetachedView(View, boolean) 3922 */ 3923 protected void detachAllViewsFromParent() { 3924 final int count = mChildrenCount; 3925 if (count <= 0) { 3926 return; 3927 } 3928 3929 final View[] children = mChildren; 3930 mChildrenCount = 0; 3931 3932 for (int i = count - 1; i >= 0; i--) { 3933 children[i].mParent = null; 3934 children[i] = null; 3935 } 3936 } 3937 3938 /** 3939 * Don't call or override this method. It is used for the implementation of 3940 * the view hierarchy. 3941 */ 3942 public final void invalidateChild(View child, final Rect dirty) { 3943 ViewParent parent = this; 3944 3945 final AttachInfo attachInfo = mAttachInfo; 3946 if (attachInfo != null) { 3947 // If the child is drawing an animation, we want to copy this flag onto 3948 // ourselves and the parent to make sure the invalidate request goes 3949 // through 3950 final boolean drawAnimation = (child.mPrivateFlags & DRAW_ANIMATION) == DRAW_ANIMATION; 3951 3952 // Check whether the child that requests the invalidate is fully opaque 3953 // Views being animated or transformed are not considered opaque because we may 3954 // be invalidating their old position and need the parent to paint behind them. 3955 Matrix childMatrix = child.getMatrix(); 3956 final boolean isOpaque = child.isOpaque() && !drawAnimation && 3957 child.getAnimation() == null && childMatrix.isIdentity(); 3958 // Mark the child as dirty, using the appropriate flag 3959 // Make sure we do not set both flags at the same time 3960 int opaqueFlag = isOpaque ? DIRTY_OPAQUE : DIRTY; 3961 3962 if (child.mLayerType != LAYER_TYPE_NONE) { 3963 mPrivateFlags |= INVALIDATED; 3964 mPrivateFlags &= ~DRAWING_CACHE_VALID; 3965 child.mLocalDirtyRect.union(dirty); 3966 } 3967 3968 final int[] location = attachInfo.mInvalidateChildLocation; 3969 location[CHILD_LEFT_INDEX] = child.mLeft; 3970 location[CHILD_TOP_INDEX] = child.mTop; 3971 if (!childMatrix.isIdentity() || 3972 (mGroupFlags & ViewGroup.FLAG_SUPPORT_STATIC_TRANSFORMATIONS) != 0) { 3973 RectF boundingRect = attachInfo.mTmpTransformRect; 3974 boundingRect.set(dirty); 3975 Matrix transformMatrix; 3976 if ((mGroupFlags & ViewGroup.FLAG_SUPPORT_STATIC_TRANSFORMATIONS) != 0) { 3977 Transformation t = attachInfo.mTmpTransformation; 3978 boolean transformed = getChildStaticTransformation(child, t); 3979 if (transformed) { 3980 transformMatrix = attachInfo.mTmpMatrix; 3981 transformMatrix.set(t.getMatrix()); 3982 if (!childMatrix.isIdentity()) { 3983 transformMatrix.preConcat(childMatrix); 3984 } 3985 } else { 3986 transformMatrix = childMatrix; 3987 } 3988 } else { 3989 transformMatrix = childMatrix; 3990 } 3991 transformMatrix.mapRect(boundingRect); 3992 dirty.set((int) (boundingRect.left - 0.5f), 3993 (int) (boundingRect.top - 0.5f), 3994 (int) (boundingRect.right + 0.5f), 3995 (int) (boundingRect.bottom + 0.5f)); 3996 } 3997 3998 do { 3999 View view = null; 4000 if (parent instanceof View) { 4001 view = (View) parent; 4002 } 4003 4004 if (drawAnimation) { 4005 if (view != null) { 4006 view.mPrivateFlags |= DRAW_ANIMATION; 4007 } else if (parent instanceof ViewRootImpl) { 4008 ((ViewRootImpl) parent).mIsAnimating = true; 4009 } 4010 } 4011 4012 // If the parent is dirty opaque or not dirty, mark it dirty with the opaque 4013 // flag coming from the child that initiated the invalidate 4014 if (view != null) { 4015 if ((view.mViewFlags & FADING_EDGE_MASK) != 0 && 4016 view.getSolidColor() == 0) { 4017 opaqueFlag = DIRTY; 4018 } 4019 if ((view.mPrivateFlags & DIRTY_MASK) != DIRTY) { 4020 view.mPrivateFlags = (view.mPrivateFlags & ~DIRTY_MASK) | opaqueFlag; 4021 } 4022 } 4023 4024 parent = parent.invalidateChildInParent(location, dirty); 4025 if (view != null) { 4026 // Account for transform on current parent 4027 Matrix m = view.getMatrix(); 4028 if (!m.isIdentity()) { 4029 RectF boundingRect = attachInfo.mTmpTransformRect; 4030 boundingRect.set(dirty); 4031 m.mapRect(boundingRect); 4032 dirty.set((int) (boundingRect.left - 0.5f), 4033 (int) (boundingRect.top - 0.5f), 4034 (int) (boundingRect.right + 0.5f), 4035 (int) (boundingRect.bottom + 0.5f)); 4036 } 4037 } 4038 } while (parent != null); 4039 } 4040 } 4041 4042 /** 4043 * Don't call or override this method. It is used for the implementation of 4044 * the view hierarchy. 4045 * 4046 * This implementation returns null if this ViewGroup does not have a parent, 4047 * if this ViewGroup is already fully invalidated or if the dirty rectangle 4048 * does not intersect with this ViewGroup's bounds. 4049 */ 4050 public ViewParent invalidateChildInParent(final int[] location, final Rect dirty) { 4051 if ((mPrivateFlags & DRAWN) == DRAWN || 4052 (mPrivateFlags & DRAWING_CACHE_VALID) == DRAWING_CACHE_VALID) { 4053 if ((mGroupFlags & (FLAG_OPTIMIZE_INVALIDATE | FLAG_ANIMATION_DONE)) != 4054 FLAG_OPTIMIZE_INVALIDATE) { 4055 dirty.offset(location[CHILD_LEFT_INDEX] - mScrollX, 4056 location[CHILD_TOP_INDEX] - mScrollY); 4057 4058 final int left = mLeft; 4059 final int top = mTop; 4060 4061 if ((mGroupFlags & FLAG_CLIP_CHILDREN) == FLAG_CLIP_CHILDREN) { 4062 if (!dirty.intersect(0, 0, mRight - left, mBottom - top)) { 4063 dirty.setEmpty(); 4064 } 4065 } 4066 mPrivateFlags &= ~DRAWING_CACHE_VALID; 4067 4068 location[CHILD_LEFT_INDEX] = left; 4069 location[CHILD_TOP_INDEX] = top; 4070 4071 if (mLayerType != LAYER_TYPE_NONE) { 4072 mPrivateFlags |= INVALIDATED; 4073 mLocalDirtyRect.union(dirty); 4074 } 4075 4076 return mParent; 4077 4078 } else { 4079 mPrivateFlags &= ~DRAWN & ~DRAWING_CACHE_VALID; 4080 4081 location[CHILD_LEFT_INDEX] = mLeft; 4082 location[CHILD_TOP_INDEX] = mTop; 4083 if ((mGroupFlags & FLAG_CLIP_CHILDREN) == FLAG_CLIP_CHILDREN) { 4084 dirty.set(0, 0, mRight - mLeft, mBottom - mTop); 4085 } else { 4086 // in case the dirty rect extends outside the bounds of this container 4087 dirty.union(0, 0, mRight - mLeft, mBottom - mTop); 4088 } 4089 4090 if (mLayerType != LAYER_TYPE_NONE) { 4091 mPrivateFlags |= INVALIDATED; 4092 mLocalDirtyRect.union(dirty); 4093 } 4094 4095 return mParent; 4096 } 4097 } 4098 4099 return null; 4100 } 4101 4102 /** 4103 * Quick invalidation method called by View.invalidateViewProperty. This doesn't set the 4104 * DRAWN flags and doesn't handle the Animation logic that the default invalidation methods 4105 * do; all we want to do here is schedule a traversal with the appropriate dirty rect. 4106 * 4107 * @hide 4108 */ 4109 public void invalidateChildFast(View child, final Rect dirty) { 4110 ViewParent parent = this; 4111 4112 final AttachInfo attachInfo = mAttachInfo; 4113 if (attachInfo != null) { 4114 if (child.mLayerType != LAYER_TYPE_NONE) { 4115 child.mLocalDirtyRect.union(dirty); 4116 } 4117 4118 int left = child.mLeft; 4119 int top = child.mTop; 4120 if (!child.getMatrix().isIdentity()) { 4121 child.transformRect(dirty); 4122 } 4123 4124 do { 4125 if (parent instanceof ViewGroup) { 4126 ViewGroup parentVG = (ViewGroup) parent; 4127 if (parentVG.mLayerType != LAYER_TYPE_NONE) { 4128 // Layered parents should be recreated, not just re-issued 4129 parentVG.invalidate(); 4130 parent = null; 4131 } else { 4132 parent = parentVG.invalidateChildInParentFast(left, top, dirty); 4133 left = parentVG.mLeft; 4134 top = parentVG.mTop; 4135 } 4136 } else { 4137 // Reached the top; this calls into the usual invalidate method in 4138 // ViewRootImpl, which schedules a traversal 4139 final int[] location = attachInfo.mInvalidateChildLocation; 4140 location[0] = left; 4141 location[1] = top; 4142 parent = parent.invalidateChildInParent(location, dirty); 4143 } 4144 } while (parent != null); 4145 } 4146 } 4147 4148 /** 4149 * Quick invalidation method that simply transforms the dirty rect into the parent's 4150 * coordinate system, pruning the invalidation if the parent has already been invalidated. 4151 */ 4152 private ViewParent invalidateChildInParentFast(int left, int top, final Rect dirty) { 4153 if ((mPrivateFlags & DRAWN) == DRAWN || 4154 (mPrivateFlags & DRAWING_CACHE_VALID) == DRAWING_CACHE_VALID) { 4155 dirty.offset(left - mScrollX, top - mScrollY); 4156 4157 if ((mGroupFlags & FLAG_CLIP_CHILDREN) == 0 || 4158 dirty.intersect(0, 0, mRight - mLeft, mBottom - mTop)) { 4159 4160 if (mLayerType != LAYER_TYPE_NONE) { 4161 mLocalDirtyRect.union(dirty); 4162 } 4163 if (!getMatrix().isIdentity()) { 4164 transformRect(dirty); 4165 } 4166 4167 return mParent; 4168 } 4169 } 4170 4171 return null; 4172 } 4173 4174 /** 4175 * Offset a rectangle that is in a descendant's coordinate 4176 * space into our coordinate space. 4177 * @param descendant A descendant of this view 4178 * @param rect A rectangle defined in descendant's coordinate space. 4179 */ 4180 public final void offsetDescendantRectToMyCoords(View descendant, Rect rect) { 4181 offsetRectBetweenParentAndChild(descendant, rect, true, false); 4182 } 4183 4184 /** 4185 * Offset a rectangle that is in our coordinate space into an ancestor's 4186 * coordinate space. 4187 * @param descendant A descendant of this view 4188 * @param rect A rectangle defined in descendant's coordinate space. 4189 */ 4190 public final void offsetRectIntoDescendantCoords(View descendant, Rect rect) { 4191 offsetRectBetweenParentAndChild(descendant, rect, false, false); 4192 } 4193 4194 /** 4195 * Helper method that offsets a rect either from parent to descendant or 4196 * descendant to parent. 4197 */ 4198 void offsetRectBetweenParentAndChild(View descendant, Rect rect, 4199 boolean offsetFromChildToParent, boolean clipToBounds) { 4200 4201 // already in the same coord system :) 4202 if (descendant == this) { 4203 return; 4204 } 4205 4206 ViewParent theParent = descendant.mParent; 4207 4208 // search and offset up to the parent 4209 while ((theParent != null) 4210 && (theParent instanceof View) 4211 && (theParent != this)) { 4212 4213 if (offsetFromChildToParent) { 4214 rect.offset(descendant.mLeft - descendant.mScrollX, 4215 descendant.mTop - descendant.mScrollY); 4216 if (clipToBounds) { 4217 View p = (View) theParent; 4218 rect.intersect(0, 0, p.mRight - p.mLeft, p.mBottom - p.mTop); 4219 } 4220 } else { 4221 if (clipToBounds) { 4222 View p = (View) theParent; 4223 rect.intersect(0, 0, p.mRight - p.mLeft, p.mBottom - p.mTop); 4224 } 4225 rect.offset(descendant.mScrollX - descendant.mLeft, 4226 descendant.mScrollY - descendant.mTop); 4227 } 4228 4229 descendant = (View) theParent; 4230 theParent = descendant.mParent; 4231 } 4232 4233 // now that we are up to this view, need to offset one more time 4234 // to get into our coordinate space 4235 if (theParent == this) { 4236 if (offsetFromChildToParent) { 4237 rect.offset(descendant.mLeft - descendant.mScrollX, 4238 descendant.mTop - descendant.mScrollY); 4239 } else { 4240 rect.offset(descendant.mScrollX - descendant.mLeft, 4241 descendant.mScrollY - descendant.mTop); 4242 } 4243 } else { 4244 throw new IllegalArgumentException("parameter must be a descendant of this view"); 4245 } 4246 } 4247 4248 /** 4249 * Offset the vertical location of all children of this view by the specified number of pixels. 4250 * 4251 * @param offset the number of pixels to offset 4252 * 4253 * @hide 4254 */ 4255 public void offsetChildrenTopAndBottom(int offset) { 4256 final int count = mChildrenCount; 4257 final View[] children = mChildren; 4258 4259 for (int i = 0; i < count; i++) { 4260 final View v = children[i]; 4261 v.mTop += offset; 4262 v.mBottom += offset; 4263 if (v.mDisplayList != null) { 4264 v.mDisplayList.offsetTopBottom(offset); 4265 invalidateViewProperty(false, false); 4266 } 4267 } 4268 } 4269 4270 /** 4271 * {@inheritDoc} 4272 */ 4273 public boolean getChildVisibleRect(View child, Rect r, android.graphics.Point offset) { 4274 // It doesn't make a whole lot of sense to call this on a view that isn't attached, 4275 // but for some simple tests it can be useful. If we don't have attach info this 4276 // will allocate memory. 4277 final RectF rect = mAttachInfo != null ? mAttachInfo.mTmpTransformRect : new RectF(); 4278 rect.set(r); 4279 4280 if (!child.hasIdentityMatrix()) { 4281 child.getMatrix().mapRect(rect); 4282 } 4283 4284 int dx = child.mLeft - mScrollX; 4285 int dy = child.mTop - mScrollY; 4286 4287 rect.offset(dx, dy); 4288 4289 if (offset != null) { 4290 if (!child.hasIdentityMatrix()) { 4291 float[] position = mAttachInfo != null ? mAttachInfo.mTmpTransformLocation 4292 : new float[2]; 4293 position[0] = offset.x; 4294 position[1] = offset.y; 4295 child.getMatrix().mapPoints(position); 4296 offset.x = (int) (position[0] + 0.5f); 4297 offset.y = (int) (position[1] + 0.5f); 4298 } 4299 offset.x += dx; 4300 offset.y += dy; 4301 } 4302 4303 if (rect.intersect(0, 0, mRight - mLeft, mBottom - mTop)) { 4304 if (mParent == null) return true; 4305 r.set((int) (rect.left + 0.5f), (int) (rect.top + 0.5f), 4306 (int) (rect.right + 0.5f), (int) (rect.bottom + 0.5f)); 4307 return mParent.getChildVisibleRect(this, r, offset); 4308 } 4309 4310 return false; 4311 } 4312 4313 /** 4314 * {@inheritDoc} 4315 */ 4316 @Override 4317 public final void layout(int l, int t, int r, int b) { 4318 if (mTransition == null || !mTransition.isChangingLayout()) { 4319 if (mTransition != null) { 4320 mTransition.layoutChange(this); 4321 } 4322 super.layout(l, t, r, b); 4323 } else { 4324 // record the fact that we noop'd it; request layout when transition finishes 4325 mLayoutSuppressed = true; 4326 } 4327 } 4328 4329 /** 4330 * {@inheritDoc} 4331 */ 4332 @Override 4333 protected abstract void onLayout(boolean changed, 4334 int l, int t, int r, int b); 4335 4336 /** 4337 * Indicates whether the view group has the ability to animate its children 4338 * after the first layout. 4339 * 4340 * @return true if the children can be animated, false otherwise 4341 */ 4342 protected boolean canAnimate() { 4343 return mLayoutAnimationController != null; 4344 } 4345 4346 /** 4347 * Runs the layout animation. Calling this method triggers a relayout of 4348 * this view group. 4349 */ 4350 public void startLayoutAnimation() { 4351 if (mLayoutAnimationController != null) { 4352 mGroupFlags |= FLAG_RUN_ANIMATION; 4353 requestLayout(); 4354 } 4355 } 4356 4357 /** 4358 * Schedules the layout animation to be played after the next layout pass 4359 * of this view group. This can be used to restart the layout animation 4360 * when the content of the view group changes or when the activity is 4361 * paused and resumed. 4362 */ 4363 public void scheduleLayoutAnimation() { 4364 mGroupFlags |= FLAG_RUN_ANIMATION; 4365 } 4366 4367 /** 4368 * Sets the layout animation controller used to animate the group's 4369 * children after the first layout. 4370 * 4371 * @param controller the animation controller 4372 */ 4373 public void setLayoutAnimation(LayoutAnimationController controller) { 4374 mLayoutAnimationController = controller; 4375 if (mLayoutAnimationController != null) { 4376 mGroupFlags |= FLAG_RUN_ANIMATION; 4377 } 4378 } 4379 4380 /** 4381 * Returns the layout animation controller used to animate the group's 4382 * children. 4383 * 4384 * @return the current animation controller 4385 */ 4386 public LayoutAnimationController getLayoutAnimation() { 4387 return mLayoutAnimationController; 4388 } 4389 4390 /** 4391 * Indicates whether the children's drawing cache is used during a layout 4392 * animation. By default, the drawing cache is enabled but this will prevent 4393 * nested layout animations from working. To nest animations, you must disable 4394 * the cache. 4395 * 4396 * @return true if the animation cache is enabled, false otherwise 4397 * 4398 * @see #setAnimationCacheEnabled(boolean) 4399 * @see View#setDrawingCacheEnabled(boolean) 4400 */ 4401 @ViewDebug.ExportedProperty 4402 public boolean isAnimationCacheEnabled() { 4403 return (mGroupFlags & FLAG_ANIMATION_CACHE) == FLAG_ANIMATION_CACHE; 4404 } 4405 4406 /** 4407 * Enables or disables the children's drawing cache during a layout animation. 4408 * By default, the drawing cache is enabled but this will prevent nested 4409 * layout animations from working. To nest animations, you must disable the 4410 * cache. 4411 * 4412 * @param enabled true to enable the animation cache, false otherwise 4413 * 4414 * @see #isAnimationCacheEnabled() 4415 * @see View#setDrawingCacheEnabled(boolean) 4416 */ 4417 public void setAnimationCacheEnabled(boolean enabled) { 4418 setBooleanFlag(FLAG_ANIMATION_CACHE, enabled); 4419 } 4420 4421 /** 4422 * Indicates whether this ViewGroup will always try to draw its children using their 4423 * drawing cache. By default this property is enabled. 4424 * 4425 * @return true if the animation cache is enabled, false otherwise 4426 * 4427 * @see #setAlwaysDrawnWithCacheEnabled(boolean) 4428 * @see #setChildrenDrawnWithCacheEnabled(boolean) 4429 * @see View#setDrawingCacheEnabled(boolean) 4430 */ 4431 @ViewDebug.ExportedProperty(category = "drawing") 4432 public boolean isAlwaysDrawnWithCacheEnabled() { 4433 return (mGroupFlags & FLAG_ALWAYS_DRAWN_WITH_CACHE) == FLAG_ALWAYS_DRAWN_WITH_CACHE; 4434 } 4435 4436 /** 4437 * Indicates whether this ViewGroup will always try to draw its children using their 4438 * drawing cache. This property can be set to true when the cache rendering is 4439 * slightly different from the children's normal rendering. Renderings can be different, 4440 * for instance, when the cache's quality is set to low. 4441 * 4442 * When this property is disabled, the ViewGroup will use the drawing cache of its 4443 * children only when asked to. It's usually the task of subclasses to tell ViewGroup 4444 * when to start using the drawing cache and when to stop using it. 4445 * 4446 * @param always true to always draw with the drawing cache, false otherwise 4447 * 4448 * @see #isAlwaysDrawnWithCacheEnabled() 4449 * @see #setChildrenDrawnWithCacheEnabled(boolean) 4450 * @see View#setDrawingCacheEnabled(boolean) 4451 * @see View#setDrawingCacheQuality(int) 4452 */ 4453 public void setAlwaysDrawnWithCacheEnabled(boolean always) { 4454 setBooleanFlag(FLAG_ALWAYS_DRAWN_WITH_CACHE, always); 4455 } 4456 4457 /** 4458 * Indicates whether the ViewGroup is currently drawing its children using 4459 * their drawing cache. 4460 * 4461 * @return true if children should be drawn with their cache, false otherwise 4462 * 4463 * @see #setAlwaysDrawnWithCacheEnabled(boolean) 4464 * @see #setChildrenDrawnWithCacheEnabled(boolean) 4465 */ 4466 @ViewDebug.ExportedProperty(category = "drawing") 4467 protected boolean isChildrenDrawnWithCacheEnabled() { 4468 return (mGroupFlags & FLAG_CHILDREN_DRAWN_WITH_CACHE) == FLAG_CHILDREN_DRAWN_WITH_CACHE; 4469 } 4470 4471 /** 4472 * Tells the ViewGroup to draw its children using their drawing cache. This property 4473 * is ignored when {@link #isAlwaysDrawnWithCacheEnabled()} is true. A child's drawing cache 4474 * will be used only if it has been enabled. 4475 * 4476 * Subclasses should call this method to start and stop using the drawing cache when 4477 * they perform performance sensitive operations, like scrolling or animating. 4478 * 4479 * @param enabled true if children should be drawn with their cache, false otherwise 4480 * 4481 * @see #setAlwaysDrawnWithCacheEnabled(boolean) 4482 * @see #isChildrenDrawnWithCacheEnabled() 4483 */ 4484 protected void setChildrenDrawnWithCacheEnabled(boolean enabled) { 4485 setBooleanFlag(FLAG_CHILDREN_DRAWN_WITH_CACHE, enabled); 4486 } 4487 4488 /** 4489 * Indicates whether the ViewGroup is drawing its children in the order defined by 4490 * {@link #getChildDrawingOrder(int, int)}. 4491 * 4492 * @return true if children drawing order is defined by {@link #getChildDrawingOrder(int, int)}, 4493 * false otherwise 4494 * 4495 * @see #setChildrenDrawingOrderEnabled(boolean) 4496 * @see #getChildDrawingOrder(int, int) 4497 */ 4498 @ViewDebug.ExportedProperty(category = "drawing") 4499 protected boolean isChildrenDrawingOrderEnabled() { 4500 return (mGroupFlags & FLAG_USE_CHILD_DRAWING_ORDER) == FLAG_USE_CHILD_DRAWING_ORDER; 4501 } 4502 4503 /** 4504 * Tells the ViewGroup whether to draw its children in the order defined by the method 4505 * {@link #getChildDrawingOrder(int, int)}. 4506 * 4507 * @param enabled true if the order of the children when drawing is determined by 4508 * {@link #getChildDrawingOrder(int, int)}, false otherwise 4509 * 4510 * @see #isChildrenDrawingOrderEnabled() 4511 * @see #getChildDrawingOrder(int, int) 4512 */ 4513 protected void setChildrenDrawingOrderEnabled(boolean enabled) { 4514 setBooleanFlag(FLAG_USE_CHILD_DRAWING_ORDER, enabled); 4515 } 4516 4517 private void setBooleanFlag(int flag, boolean value) { 4518 if (value) { 4519 mGroupFlags |= flag; 4520 } else { 4521 mGroupFlags &= ~flag; 4522 } 4523 } 4524 4525 /** 4526 * Returns an integer indicating what types of drawing caches are kept in memory. 4527 * 4528 * @see #setPersistentDrawingCache(int) 4529 * @see #setAnimationCacheEnabled(boolean) 4530 * 4531 * @return one or a combination of {@link #PERSISTENT_NO_CACHE}, 4532 * {@link #PERSISTENT_ANIMATION_CACHE}, {@link #PERSISTENT_SCROLLING_CACHE} 4533 * and {@link #PERSISTENT_ALL_CACHES} 4534 */ 4535 @ViewDebug.ExportedProperty(category = "drawing", mapping = { 4536 @ViewDebug.IntToString(from = PERSISTENT_NO_CACHE, to = "NONE"), 4537 @ViewDebug.IntToString(from = PERSISTENT_ANIMATION_CACHE, to = "ANIMATION"), 4538 @ViewDebug.IntToString(from = PERSISTENT_SCROLLING_CACHE, to = "SCROLLING"), 4539 @ViewDebug.IntToString(from = PERSISTENT_ALL_CACHES, to = "ALL") 4540 }) 4541 public int getPersistentDrawingCache() { 4542 return mPersistentDrawingCache; 4543 } 4544 4545 /** 4546 * Indicates what types of drawing caches should be kept in memory after 4547 * they have been created. 4548 * 4549 * @see #getPersistentDrawingCache() 4550 * @see #setAnimationCacheEnabled(boolean) 4551 * 4552 * @param drawingCacheToKeep one or a combination of {@link #PERSISTENT_NO_CACHE}, 4553 * {@link #PERSISTENT_ANIMATION_CACHE}, {@link #PERSISTENT_SCROLLING_CACHE} 4554 * and {@link #PERSISTENT_ALL_CACHES} 4555 */ 4556 public void setPersistentDrawingCache(int drawingCacheToKeep) { 4557 mPersistentDrawingCache = drawingCacheToKeep & PERSISTENT_ALL_CACHES; 4558 } 4559 4560 /** 4561 * Returns the basis of alignment during layout operations on this view group: 4562 * either {@link #CLIP_BOUNDS} or {@link #OPTICAL_BOUNDS}. 4563 * 4564 * @return the layout mode to use during layout operations 4565 * 4566 * @see #setLayoutMode(int) 4567 * 4568 * @hide 4569 */ 4570 public int getLayoutMode() { 4571 return mLayoutMode; 4572 } 4573 4574 /** 4575 * Sets the basis of alignment during the layout of this view group. 4576 * Valid values are either {@link #CLIP_BOUNDS} or {@link #OPTICAL_BOUNDS}. 4577 * <p> 4578 * The default is {@link #CLIP_BOUNDS}. 4579 * 4580 * @param layoutMode the layout mode to use during layout operations 4581 * 4582 * @see #getLayoutMode() 4583 * 4584 * @hide 4585 */ 4586 public void setLayoutMode(int layoutMode) { 4587 if (mLayoutMode != layoutMode) { 4588 mLayoutMode = layoutMode; 4589 requestLayout(); 4590 } 4591 } 4592 4593 /** 4594 * Returns a new set of layout parameters based on the supplied attributes set. 4595 * 4596 * @param attrs the attributes to build the layout parameters from 4597 * 4598 * @return an instance of {@link android.view.ViewGroup.LayoutParams} or one 4599 * of its descendants 4600 */ 4601 public LayoutParams generateLayoutParams(AttributeSet attrs) { 4602 return new LayoutParams(getContext(), attrs); 4603 } 4604 4605 /** 4606 * Returns a safe set of layout parameters based on the supplied layout params. 4607 * When a ViewGroup is passed a View whose layout params do not pass the test of 4608 * {@link #checkLayoutParams(android.view.ViewGroup.LayoutParams)}, this method 4609 * is invoked. This method should return a new set of layout params suitable for 4610 * this ViewGroup, possibly by copying the appropriate attributes from the 4611 * specified set of layout params. 4612 * 4613 * @param p The layout parameters to convert into a suitable set of layout parameters 4614 * for this ViewGroup. 4615 * 4616 * @return an instance of {@link android.view.ViewGroup.LayoutParams} or one 4617 * of its descendants 4618 */ 4619 protected LayoutParams generateLayoutParams(ViewGroup.LayoutParams p) { 4620 return p; 4621 } 4622 4623 /** 4624 * Returns a set of default layout parameters. These parameters are requested 4625 * when the View passed to {@link #addView(View)} has no layout parameters 4626 * already set. If null is returned, an exception is thrown from addView. 4627 * 4628 * @return a set of default layout parameters or null 4629 */ 4630 protected LayoutParams generateDefaultLayoutParams() { 4631 return new LayoutParams(LayoutParams.WRAP_CONTENT, LayoutParams.WRAP_CONTENT); 4632 } 4633 4634 /** 4635 * {@inheritDoc} 4636 */ 4637 @Override 4638 protected void debug(int depth) { 4639 super.debug(depth); 4640 String output; 4641 4642 if (mFocused != null) { 4643 output = debugIndent(depth); 4644 output += "mFocused"; 4645 Log.d(VIEW_LOG_TAG, output); 4646 } 4647 if (mChildrenCount != 0) { 4648 output = debugIndent(depth); 4649 output += "{"; 4650 Log.d(VIEW_LOG_TAG, output); 4651 } 4652 int count = mChildrenCount; 4653 for (int i = 0; i < count; i++) { 4654 View child = mChildren[i]; 4655 child.debug(depth + 1); 4656 } 4657 4658 if (mChildrenCount != 0) { 4659 output = debugIndent(depth); 4660 output += "}"; 4661 Log.d(VIEW_LOG_TAG, output); 4662 } 4663 } 4664 4665 /** 4666 * Returns the position in the group of the specified child view. 4667 * 4668 * @param child the view for which to get the position 4669 * @return a positive integer representing the position of the view in the 4670 * group, or -1 if the view does not exist in the group 4671 */ 4672 public int indexOfChild(View child) { 4673 final int count = mChildrenCount; 4674 final View[] children = mChildren; 4675 for (int i = 0; i < count; i++) { 4676 if (children[i] == child) { 4677 return i; 4678 } 4679 } 4680 return -1; 4681 } 4682 4683 /** 4684 * Returns the number of children in the group. 4685 * 4686 * @return a positive integer representing the number of children in 4687 * the group 4688 */ 4689 public int getChildCount() { 4690 return mChildrenCount; 4691 } 4692 4693 /** 4694 * Returns the view at the specified position in the group. 4695 * 4696 * @param index the position at which to get the view from 4697 * @return the view at the specified position or null if the position 4698 * does not exist within the group 4699 */ 4700 public View getChildAt(int index) { 4701 if (index < 0 || index >= mChildrenCount) { 4702 return null; 4703 } 4704 return mChildren[index]; 4705 } 4706 4707 /** 4708 * Ask all of the children of this view to measure themselves, taking into 4709 * account both the MeasureSpec requirements for this view and its padding. 4710 * We skip children that are in the GONE state The heavy lifting is done in 4711 * getChildMeasureSpec. 4712 * 4713 * @param widthMeasureSpec The width requirements for this view 4714 * @param heightMeasureSpec The height requirements for this view 4715 */ 4716 protected void measureChildren(int widthMeasureSpec, int heightMeasureSpec) { 4717 final int size = mChildrenCount; 4718 final View[] children = mChildren; 4719 for (int i = 0; i < size; ++i) { 4720 final View child = children[i]; 4721 if ((child.mViewFlags & VISIBILITY_MASK) != GONE) { 4722 measureChild(child, widthMeasureSpec, heightMeasureSpec); 4723 } 4724 } 4725 } 4726 4727 /** 4728 * Ask one of the children of this view to measure itself, taking into 4729 * account both the MeasureSpec requirements for this view and its padding. 4730 * The heavy lifting is done in getChildMeasureSpec. 4731 * 4732 * @param child The child to measure 4733 * @param parentWidthMeasureSpec The width requirements for this view 4734 * @param parentHeightMeasureSpec The height requirements for this view 4735 */ 4736 protected void measureChild(View child, int parentWidthMeasureSpec, 4737 int parentHeightMeasureSpec) { 4738 final LayoutParams lp = child.getLayoutParams(); 4739 4740 final int childWidthMeasureSpec = getChildMeasureSpec(parentWidthMeasureSpec, 4741 mPaddingLeft + mPaddingRight, lp.width); 4742 final int childHeightMeasureSpec = getChildMeasureSpec(parentHeightMeasureSpec, 4743 mPaddingTop + mPaddingBottom, lp.height); 4744 4745 child.measure(childWidthMeasureSpec, childHeightMeasureSpec); 4746 } 4747 4748 /** 4749 * Ask one of the children of this view to measure itself, taking into 4750 * account both the MeasureSpec requirements for this view and its padding 4751 * and margins. The child must have MarginLayoutParams The heavy lifting is 4752 * done in getChildMeasureSpec. 4753 * 4754 * @param child The child to measure 4755 * @param parentWidthMeasureSpec The width requirements for this view 4756 * @param widthUsed Extra space that has been used up by the parent 4757 * horizontally (possibly by other children of the parent) 4758 * @param parentHeightMeasureSpec The height requirements for this view 4759 * @param heightUsed Extra space that has been used up by the parent 4760 * vertically (possibly by other children of the parent) 4761 */ 4762 protected void measureChildWithMargins(View child, 4763 int parentWidthMeasureSpec, int widthUsed, 4764 int parentHeightMeasureSpec, int heightUsed) { 4765 final MarginLayoutParams lp = (MarginLayoutParams) child.getLayoutParams(); 4766 4767 final int childWidthMeasureSpec = getChildMeasureSpec(parentWidthMeasureSpec, 4768 mPaddingLeft + mPaddingRight + lp.leftMargin + lp.rightMargin 4769 + widthUsed, lp.width); 4770 final int childHeightMeasureSpec = getChildMeasureSpec(parentHeightMeasureSpec, 4771 mPaddingTop + mPaddingBottom + lp.topMargin + lp.bottomMargin 4772 + heightUsed, lp.height); 4773 4774 child.measure(childWidthMeasureSpec, childHeightMeasureSpec); 4775 } 4776 4777 /** 4778 * Does the hard part of measureChildren: figuring out the MeasureSpec to 4779 * pass to a particular child. This method figures out the right MeasureSpec 4780 * for one dimension (height or width) of one child view. 4781 * 4782 * The goal is to combine information from our MeasureSpec with the 4783 * LayoutParams of the child to get the best possible results. For example, 4784 * if the this view knows its size (because its MeasureSpec has a mode of 4785 * EXACTLY), and the child has indicated in its LayoutParams that it wants 4786 * to be the same size as the parent, the parent should ask the child to 4787 * layout given an exact size. 4788 * 4789 * @param spec The requirements for this view 4790 * @param padding The padding of this view for the current dimension and 4791 * margins, if applicable 4792 * @param childDimension How big the child wants to be in the current 4793 * dimension 4794 * @return a MeasureSpec integer for the child 4795 */ 4796 public static int getChildMeasureSpec(int spec, int padding, int childDimension) { 4797 int specMode = MeasureSpec.getMode(spec); 4798 int specSize = MeasureSpec.getSize(spec); 4799 4800 int size = Math.max(0, specSize - padding); 4801 4802 int resultSize = 0; 4803 int resultMode = 0; 4804 4805 switch (specMode) { 4806 // Parent has imposed an exact size on us 4807 case MeasureSpec.EXACTLY: 4808 if (childDimension >= 0) { 4809 resultSize = childDimension; 4810 resultMode = MeasureSpec.EXACTLY; 4811 } else if (childDimension == LayoutParams.MATCH_PARENT) { 4812 // Child wants to be our size. So be it. 4813 resultSize = size; 4814 resultMode = MeasureSpec.EXACTLY; 4815 } else if (childDimension == LayoutParams.WRAP_CONTENT) { 4816 // Child wants to determine its own size. It can't be 4817 // bigger than us. 4818 resultSize = size; 4819 resultMode = MeasureSpec.AT_MOST; 4820 } 4821 break; 4822 4823 // Parent has imposed a maximum size on us 4824 case MeasureSpec.AT_MOST: 4825 if (childDimension >= 0) { 4826 // Child wants a specific size... so be it 4827 resultSize = childDimension; 4828 resultMode = MeasureSpec.EXACTLY; 4829 } else if (childDimension == LayoutParams.MATCH_PARENT) { 4830 // Child wants to be our size, but our size is not fixed. 4831 // Constrain child to not be bigger than us. 4832 resultSize = size; 4833 resultMode = MeasureSpec.AT_MOST; 4834 } else if (childDimension == LayoutParams.WRAP_CONTENT) { 4835 // Child wants to determine its own size. It can't be 4836 // bigger than us. 4837 resultSize = size; 4838 resultMode = MeasureSpec.AT_MOST; 4839 } 4840 break; 4841 4842 // Parent asked to see how big we want to be 4843 case MeasureSpec.UNSPECIFIED: 4844 if (childDimension >= 0) { 4845 // Child wants a specific size... let him have it 4846 resultSize = childDimension; 4847 resultMode = MeasureSpec.EXACTLY; 4848 } else if (childDimension == LayoutParams.MATCH_PARENT) { 4849 // Child wants to be our size... find out how big it should 4850 // be 4851 resultSize = 0; 4852 resultMode = MeasureSpec.UNSPECIFIED; 4853 } else if (childDimension == LayoutParams.WRAP_CONTENT) { 4854 // Child wants to determine its own size.... find out how 4855 // big it should be 4856 resultSize = 0; 4857 resultMode = MeasureSpec.UNSPECIFIED; 4858 } 4859 break; 4860 } 4861 return MeasureSpec.makeMeasureSpec(resultSize, resultMode); 4862 } 4863 4864 4865 /** 4866 * Removes any pending animations for views that have been removed. Call 4867 * this if you don't want animations for exiting views to stack up. 4868 */ 4869 public void clearDisappearingChildren() { 4870 if (mDisappearingChildren != null) { 4871 mDisappearingChildren.clear(); 4872 invalidate(); 4873 } 4874 } 4875 4876 /** 4877 * Add a view which is removed from mChildren but still needs animation 4878 * 4879 * @param v View to add 4880 */ 4881 private void addDisappearingView(View v) { 4882 ArrayList<View> disappearingChildren = mDisappearingChildren; 4883 4884 if (disappearingChildren == null) { 4885 disappearingChildren = mDisappearingChildren = new ArrayList<View>(); 4886 } 4887 4888 disappearingChildren.add(v); 4889 } 4890 4891 /** 4892 * Cleanup a view when its animation is done. This may mean removing it from 4893 * the list of disappearing views. 4894 * 4895 * @param view The view whose animation has finished 4896 * @param animation The animation, cannot be null 4897 */ 4898 void finishAnimatingView(final View view, Animation animation) { 4899 final ArrayList<View> disappearingChildren = mDisappearingChildren; 4900 if (disappearingChildren != null) { 4901 if (disappearingChildren.contains(view)) { 4902 disappearingChildren.remove(view); 4903 4904 if (view.mAttachInfo != null) { 4905 view.dispatchDetachedFromWindow(); 4906 } 4907 4908 view.clearAnimation(); 4909 mGroupFlags |= FLAG_INVALIDATE_REQUIRED; 4910 } 4911 } 4912 4913 if (animation != null && !animation.getFillAfter()) { 4914 view.clearAnimation(); 4915 } 4916 4917 if ((view.mPrivateFlags & ANIMATION_STARTED) == ANIMATION_STARTED) { 4918 view.onAnimationEnd(); 4919 // Should be performed by onAnimationEnd() but this avoid an infinite loop, 4920 // so we'd rather be safe than sorry 4921 view.mPrivateFlags &= ~ANIMATION_STARTED; 4922 // Draw one more frame after the animation is done 4923 mGroupFlags |= FLAG_INVALIDATE_REQUIRED; 4924 } 4925 } 4926 4927 /** 4928 * Utility function called by View during invalidation to determine whether a view that 4929 * is invisible or gone should still be invalidated because it is being transitioned (and 4930 * therefore still needs to be drawn). 4931 */ 4932 boolean isViewTransitioning(View view) { 4933 return (mTransitioningViews != null && mTransitioningViews.contains(view)); 4934 } 4935 4936 /** 4937 * This method tells the ViewGroup that the given View object, which should have this 4938 * ViewGroup as its parent, 4939 * should be kept around (re-displayed when the ViewGroup draws its children) even if it 4940 * is removed from its parent. This allows animations, such as those used by 4941 * {@link android.app.Fragment} and {@link android.animation.LayoutTransition} to animate 4942 * the removal of views. A call to this method should always be accompanied by a later call 4943 * to {@link #endViewTransition(View)}, such as after an animation on the View has finished, 4944 * so that the View finally gets removed. 4945 * 4946 * @param view The View object to be kept visible even if it gets removed from its parent. 4947 */ 4948 public void startViewTransition(View view) { 4949 if (view.mParent == this) { 4950 if (mTransitioningViews == null) { 4951 mTransitioningViews = new ArrayList<View>(); 4952 } 4953 mTransitioningViews.add(view); 4954 } 4955 } 4956 4957 /** 4958 * This method should always be called following an earlier call to 4959 * {@link #startViewTransition(View)}. The given View is finally removed from its parent 4960 * and will no longer be displayed. Note that this method does not perform the functionality 4961 * of removing a view from its parent; it just discontinues the display of a View that 4962 * has previously been removed. 4963 * 4964 * @return view The View object that has been removed but is being kept around in the visible 4965 * hierarchy by an earlier call to {@link #startViewTransition(View)}. 4966 */ 4967 public void endViewTransition(View view) { 4968 if (mTransitioningViews != null) { 4969 mTransitioningViews.remove(view); 4970 final ArrayList<View> disappearingChildren = mDisappearingChildren; 4971 if (disappearingChildren != null && disappearingChildren.contains(view)) { 4972 disappearingChildren.remove(view); 4973 if (mVisibilityChangingChildren != null && 4974 mVisibilityChangingChildren.contains(view)) { 4975 mVisibilityChangingChildren.remove(view); 4976 } else { 4977 if (view.mAttachInfo != null) { 4978 view.dispatchDetachedFromWindow(); 4979 } 4980 if (view.mParent != null) { 4981 view.mParent = null; 4982 } 4983 } 4984 invalidate(); 4985 } 4986 } 4987 } 4988 4989 private LayoutTransition.TransitionListener mLayoutTransitionListener = 4990 new LayoutTransition.TransitionListener() { 4991 @Override 4992 public void startTransition(LayoutTransition transition, ViewGroup container, 4993 View view, int transitionType) { 4994 // We only care about disappearing items, since we need special logic to keep 4995 // those items visible after they've been 'removed' 4996 if (transitionType == LayoutTransition.DISAPPEARING) { 4997 startViewTransition(view); 4998 } 4999 } 5000 5001 @Override 5002 public void endTransition(LayoutTransition transition, ViewGroup container, 5003 View view, int transitionType) { 5004 if (mLayoutSuppressed && !transition.isChangingLayout()) { 5005 requestLayout(); 5006 mLayoutSuppressed = false; 5007 } 5008 if (transitionType == LayoutTransition.DISAPPEARING && mTransitioningViews != null) { 5009 endViewTransition(view); 5010 } 5011 } 5012 }; 5013 5014 /** 5015 * {@inheritDoc} 5016 */ 5017 @Override 5018 public boolean gatherTransparentRegion(Region region) { 5019 // If no transparent regions requested, we are always opaque. 5020 final boolean meOpaque = (mPrivateFlags & View.REQUEST_TRANSPARENT_REGIONS) == 0; 5021 if (meOpaque && region == null) { 5022 // The caller doesn't care about the region, so stop now. 5023 return true; 5024 } 5025 super.gatherTransparentRegion(region); 5026 final View[] children = mChildren; 5027 final int count = mChildrenCount; 5028 boolean noneOfTheChildrenAreTransparent = true; 5029 for (int i = 0; i < count; i++) { 5030 final View child = children[i]; 5031 if ((child.mViewFlags & VISIBILITY_MASK) == VISIBLE || child.getAnimation() != null) { 5032 if (!child.gatherTransparentRegion(region)) { 5033 noneOfTheChildrenAreTransparent = false; 5034 } 5035 } 5036 } 5037 return meOpaque || noneOfTheChildrenAreTransparent; 5038 } 5039 5040 /** 5041 * {@inheritDoc} 5042 */ 5043 public void requestTransparentRegion(View child) { 5044 if (child != null) { 5045 child.mPrivateFlags |= View.REQUEST_TRANSPARENT_REGIONS; 5046 if (mParent != null) { 5047 mParent.requestTransparentRegion(this); 5048 } 5049 } 5050 } 5051 5052 5053 @Override 5054 protected boolean fitSystemWindows(Rect insets) { 5055 boolean done = super.fitSystemWindows(insets); 5056 if (!done) { 5057 final int count = mChildrenCount; 5058 final View[] children = mChildren; 5059 for (int i = 0; i < count; i++) { 5060 done = children[i].fitSystemWindows(insets); 5061 if (done) { 5062 break; 5063 } 5064 } 5065 } 5066 return done; 5067 } 5068 5069 /** 5070 * Returns the animation listener to which layout animation events are 5071 * sent. 5072 * 5073 * @return an {@link android.view.animation.Animation.AnimationListener} 5074 */ 5075 public Animation.AnimationListener getLayoutAnimationListener() { 5076 return mAnimationListener; 5077 } 5078 5079 @Override 5080 protected void drawableStateChanged() { 5081 super.drawableStateChanged(); 5082 5083 if ((mGroupFlags & FLAG_NOTIFY_CHILDREN_ON_DRAWABLE_STATE_CHANGE) != 0) { 5084 if ((mGroupFlags & FLAG_ADD_STATES_FROM_CHILDREN) != 0) { 5085 throw new IllegalStateException("addStateFromChildren cannot be enabled if a" 5086 + " child has duplicateParentState set to true"); 5087 } 5088 5089 final View[] children = mChildren; 5090 final int count = mChildrenCount; 5091 5092 for (int i = 0; i < count; i++) { 5093 final View child = children[i]; 5094 if ((child.mViewFlags & DUPLICATE_PARENT_STATE) != 0) { 5095 child.refreshDrawableState(); 5096 } 5097 } 5098 } 5099 } 5100 5101 @Override 5102 public void jumpDrawablesToCurrentState() { 5103 super.jumpDrawablesToCurrentState(); 5104 final View[] children = mChildren; 5105 final int count = mChildrenCount; 5106 for (int i = 0; i < count; i++) { 5107 children[i].jumpDrawablesToCurrentState(); 5108 } 5109 } 5110 5111 @Override 5112 protected int[] onCreateDrawableState(int extraSpace) { 5113 if ((mGroupFlags & FLAG_ADD_STATES_FROM_CHILDREN) == 0) { 5114 return super.onCreateDrawableState(extraSpace); 5115 } 5116 5117 int need = 0; 5118 int n = getChildCount(); 5119 for (int i = 0; i < n; i++) { 5120 int[] childState = getChildAt(i).getDrawableState(); 5121 5122 if (childState != null) { 5123 need += childState.length; 5124 } 5125 } 5126 5127 int[] state = super.onCreateDrawableState(extraSpace + need); 5128 5129 for (int i = 0; i < n; i++) { 5130 int[] childState = getChildAt(i).getDrawableState(); 5131 5132 if (childState != null) { 5133 state = mergeDrawableStates(state, childState); 5134 } 5135 } 5136 5137 return state; 5138 } 5139 5140 /** 5141 * Sets whether this ViewGroup's drawable states also include 5142 * its children's drawable states. This is used, for example, to 5143 * make a group appear to be focused when its child EditText or button 5144 * is focused. 5145 */ 5146 public void setAddStatesFromChildren(boolean addsStates) { 5147 if (addsStates) { 5148 mGroupFlags |= FLAG_ADD_STATES_FROM_CHILDREN; 5149 } else { 5150 mGroupFlags &= ~FLAG_ADD_STATES_FROM_CHILDREN; 5151 } 5152 5153 refreshDrawableState(); 5154 } 5155 5156 /** 5157 * Returns whether this ViewGroup's drawable states also include 5158 * its children's drawable states. This is used, for example, to 5159 * make a group appear to be focused when its child EditText or button 5160 * is focused. 5161 */ 5162 public boolean addStatesFromChildren() { 5163 return (mGroupFlags & FLAG_ADD_STATES_FROM_CHILDREN) != 0; 5164 } 5165 5166 /** 5167 * If {@link #addStatesFromChildren} is true, refreshes this group's 5168 * drawable state (to include the states from its children). 5169 */ 5170 public void childDrawableStateChanged(View child) { 5171 if ((mGroupFlags & FLAG_ADD_STATES_FROM_CHILDREN) != 0) { 5172 refreshDrawableState(); 5173 } 5174 } 5175 5176 /** 5177 * Specifies the animation listener to which layout animation events must 5178 * be sent. Only 5179 * {@link android.view.animation.Animation.AnimationListener#onAnimationStart(Animation)} 5180 * and 5181 * {@link android.view.animation.Animation.AnimationListener#onAnimationEnd(Animation)} 5182 * are invoked. 5183 * 5184 * @param animationListener the layout animation listener 5185 */ 5186 public void setLayoutAnimationListener(Animation.AnimationListener animationListener) { 5187 mAnimationListener = animationListener; 5188 } 5189 5190 /** 5191 * This method is called by LayoutTransition when there are 'changing' animations that need 5192 * to start after the layout/setup phase. The request is forwarded to the ViewAncestor, who 5193 * starts all pending transitions prior to the drawing phase in the current traversal. 5194 * 5195 * @param transition The LayoutTransition to be started on the next traversal. 5196 * 5197 * @hide 5198 */ 5199 public void requestTransitionStart(LayoutTransition transition) { 5200 ViewRootImpl viewAncestor = getViewRootImpl(); 5201 if (viewAncestor != null) { 5202 viewAncestor.requestTransitionStart(transition); 5203 } 5204 } 5205 5206 @Override 5207 public void onResolvedLayoutDirectionReset() { 5208 // Take care of resetting the children resolution too 5209 final int count = getChildCount(); 5210 for (int i = 0; i < count; i++) { 5211 final View child = getChildAt(i); 5212 if (child.getLayoutDirection() == LAYOUT_DIRECTION_INHERIT) { 5213 child.resetResolvedLayoutDirection(); 5214 } 5215 } 5216 } 5217 5218 @Override 5219 public void onResolvedTextDirectionReset() { 5220 // Take care of resetting the children resolution too 5221 final int count = getChildCount(); 5222 for (int i = 0; i < count; i++) { 5223 final View child = getChildAt(i); 5224 if (child.getTextDirection() == TEXT_DIRECTION_INHERIT) { 5225 child.resetResolvedTextDirection(); 5226 } 5227 } 5228 } 5229 5230 @Override 5231 public void onResolvedTextAlignmentReset() { 5232 // Take care of resetting the children resolution too 5233 final int count = getChildCount(); 5234 for (int i = 0; i < count; i++) { 5235 final View child = getChildAt(i); 5236 if (child.getTextAlignment() == TEXT_ALIGNMENT_INHERIT) { 5237 child.resetResolvedTextAlignment(); 5238 } 5239 } 5240 } 5241 5242 /** 5243 * Return true if the pressed state should be delayed for children or descendants of this 5244 * ViewGroup. Generally, this should be done for containers that can scroll, such as a List. 5245 * This prevents the pressed state from appearing when the user is actually trying to scroll 5246 * the content. 5247 * 5248 * The default implementation returns true for compatibility reasons. Subclasses that do 5249 * not scroll should generally override this method and return false. 5250 */ 5251 public boolean shouldDelayChildPressedState() { 5252 return true; 5253 } 5254 5255 /** @hide */ 5256 protected void onSetLayoutParams(View child, LayoutParams layoutParams) { 5257 } 5258 5259 /** 5260 * LayoutParams are used by views to tell their parents how they want to be 5261 * laid out. See 5262 * {@link android.R.styleable#ViewGroup_Layout ViewGroup Layout Attributes} 5263 * for a list of all child view attributes that this class supports. 5264 * 5265 * <p> 5266 * The base LayoutParams class just describes how big the view wants to be 5267 * for both width and height. For each dimension, it can specify one of: 5268 * <ul> 5269 * <li>FILL_PARENT (renamed MATCH_PARENT in API Level 8 and higher), which 5270 * means that the view wants to be as big as its parent (minus padding) 5271 * <li> WRAP_CONTENT, which means that the view wants to be just big enough 5272 * to enclose its content (plus padding) 5273 * <li> an exact number 5274 * </ul> 5275 * There are subclasses of LayoutParams for different subclasses of 5276 * ViewGroup. For example, AbsoluteLayout has its own subclass of 5277 * LayoutParams which adds an X and Y value.</p> 5278 * 5279 * <div class="special reference"> 5280 * <h3>Developer Guides</h3> 5281 * <p>For more information about creating user interface layouts, read the 5282 * <a href="{@docRoot}guide/topics/ui/declaring-layout.html">XML Layouts</a> developer 5283 * guide.</p></div> 5284 * 5285 * @attr ref android.R.styleable#ViewGroup_Layout_layout_height 5286 * @attr ref android.R.styleable#ViewGroup_Layout_layout_width 5287 */ 5288 public static class LayoutParams { 5289 /** 5290 * Special value for the height or width requested by a View. 5291 * FILL_PARENT means that the view wants to be as big as its parent, 5292 * minus the parent's padding, if any. This value is deprecated 5293 * starting in API Level 8 and replaced by {@link #MATCH_PARENT}. 5294 */ 5295 @SuppressWarnings({"UnusedDeclaration"}) 5296 @Deprecated 5297 public static final int FILL_PARENT = -1; 5298 5299 /** 5300 * Special value for the height or width requested by a View. 5301 * MATCH_PARENT means that the view wants to be as big as its parent, 5302 * minus the parent's padding, if any. Introduced in API Level 8. 5303 */ 5304 public static final int MATCH_PARENT = -1; 5305 5306 /** 5307 * Special value for the height or width requested by a View. 5308 * WRAP_CONTENT means that the view wants to be just large enough to fit 5309 * its own internal content, taking its own padding into account. 5310 */ 5311 public static final int WRAP_CONTENT = -2; 5312 5313 /** 5314 * Information about how wide the view wants to be. Can be one of the 5315 * constants FILL_PARENT (replaced by MATCH_PARENT , 5316 * in API Level 8) or WRAP_CONTENT. or an exact size. 5317 */ 5318 @ViewDebug.ExportedProperty(category = "layout", mapping = { 5319 @ViewDebug.IntToString(from = MATCH_PARENT, to = "MATCH_PARENT"), 5320 @ViewDebug.IntToString(from = WRAP_CONTENT, to = "WRAP_CONTENT") 5321 }) 5322 public int width; 5323 5324 /** 5325 * Information about how tall the view wants to be. Can be one of the 5326 * constants FILL_PARENT (replaced by MATCH_PARENT , 5327 * in API Level 8) or WRAP_CONTENT. or an exact size. 5328 */ 5329 @ViewDebug.ExportedProperty(category = "layout", mapping = { 5330 @ViewDebug.IntToString(from = MATCH_PARENT, to = "MATCH_PARENT"), 5331 @ViewDebug.IntToString(from = WRAP_CONTENT, to = "WRAP_CONTENT") 5332 }) 5333 public int height; 5334 5335 /** 5336 * Used to animate layouts. 5337 */ 5338 public LayoutAnimationController.AnimationParameters layoutAnimationParameters; 5339 5340 /** 5341 * Creates a new set of layout parameters. The values are extracted from 5342 * the supplied attributes set and context. The XML attributes mapped 5343 * to this set of layout parameters are: 5344 * 5345 * <ul> 5346 * <li><code>layout_width</code>: the width, either an exact value, 5347 * {@link #WRAP_CONTENT}, or {@link #FILL_PARENT} (replaced by 5348 * {@link #MATCH_PARENT} in API Level 8)</li> 5349 * <li><code>layout_height</code>: the height, either an exact value, 5350 * {@link #WRAP_CONTENT}, or {@link #FILL_PARENT} (replaced by 5351 * {@link #MATCH_PARENT} in API Level 8)</li> 5352 * </ul> 5353 * 5354 * @param c the application environment 5355 * @param attrs the set of attributes from which to extract the layout 5356 * parameters' values 5357 */ 5358 public LayoutParams(Context c, AttributeSet attrs) { 5359 TypedArray a = c.obtainStyledAttributes(attrs, R.styleable.ViewGroup_Layout); 5360 setBaseAttributes(a, 5361 R.styleable.ViewGroup_Layout_layout_width, 5362 R.styleable.ViewGroup_Layout_layout_height); 5363 a.recycle(); 5364 } 5365 5366 /** 5367 * Creates a new set of layout parameters with the specified width 5368 * and height. 5369 * 5370 * @param width the width, either {@link #WRAP_CONTENT}, 5371 * {@link #FILL_PARENT} (replaced by {@link #MATCH_PARENT} in 5372 * API Level 8), or a fixed size in pixels 5373 * @param height the height, either {@link #WRAP_CONTENT}, 5374 * {@link #FILL_PARENT} (replaced by {@link #MATCH_PARENT} in 5375 * API Level 8), or a fixed size in pixels 5376 */ 5377 public LayoutParams(int width, int height) { 5378 this.width = width; 5379 this.height = height; 5380 } 5381 5382 /** 5383 * Copy constructor. Clones the width and height values of the source. 5384 * 5385 * @param source The layout params to copy from. 5386 */ 5387 public LayoutParams(LayoutParams source) { 5388 this.width = source.width; 5389 this.height = source.height; 5390 } 5391 5392 /** 5393 * Used internally by MarginLayoutParams. 5394 * @hide 5395 */ 5396 LayoutParams() { 5397 } 5398 5399 /** 5400 * Extracts the <code>width</code> and <code>height</code> layout parameters 5401 * from the supplied TypedArray, <code>a</code>, and assigns them 5402 * to the appropriate fields. If, <code>a</code>, does not contain an 5403 * entry for either attribute, the value, {@link ViewGroup.LayoutParams#WRAP_CONTENT}, 5404 * is used as a default. 5405 * 5406 * @param a the style attributes to extract the parameters from 5407 * @param widthAttr the identifier of the width attribute 5408 * @param heightAttr the identifier of the height attribute 5409 */ 5410 protected void setBaseAttributes(TypedArray a, int widthAttr, int heightAttr) { 5411 width = a.getLayoutDimension(widthAttr, WRAP_CONTENT); 5412 height = a.getLayoutDimension(heightAttr, WRAP_CONTENT); 5413 } 5414 5415 /** 5416 * Resolve layout parameters depending on the layout direction. Subclasses that care about 5417 * layoutDirection changes should override this method. The default implementation does 5418 * nothing. 5419 * 5420 * @param layoutDirection the direction of the layout 5421 * 5422 * {@link View#LAYOUT_DIRECTION_LTR} 5423 * {@link View#LAYOUT_DIRECTION_RTL} 5424 */ 5425 public void onResolveLayoutDirection(int layoutDirection) { 5426 } 5427 5428 /** 5429 * Returns a String representation of this set of layout parameters. 5430 * 5431 * @param output the String to prepend to the internal representation 5432 * @return a String with the following format: output + 5433 * "ViewGroup.LayoutParams={ width=WIDTH, height=HEIGHT }" 5434 * 5435 * @hide 5436 */ 5437 public String debug(String output) { 5438 return output + "ViewGroup.LayoutParams={ width=" 5439 + sizeToString(width) + ", height=" + sizeToString(height) + " }"; 5440 } 5441 5442 /** 5443 * Use {@code canvas} to draw suitable debugging annotations for these LayoutParameters. 5444 * 5445 * @param view the view that contains these layout parameters 5446 * @param canvas the canvas on which to draw 5447 * 5448 * @hide 5449 */ 5450 public void onDebugDraw(View view, Canvas canvas) { 5451 } 5452 5453 /** 5454 * Converts the specified size to a readable String. 5455 * 5456 * @param size the size to convert 5457 * @return a String instance representing the supplied size 5458 * 5459 * @hide 5460 */ 5461 protected static String sizeToString(int size) { 5462 if (size == WRAP_CONTENT) { 5463 return "wrap-content"; 5464 } 5465 if (size == MATCH_PARENT) { 5466 return "match-parent"; 5467 } 5468 return String.valueOf(size); 5469 } 5470 } 5471 5472 /** 5473 * Per-child layout information for layouts that support margins. 5474 * See 5475 * {@link android.R.styleable#ViewGroup_MarginLayout ViewGroup Margin Layout Attributes} 5476 * for a list of all child view attributes that this class supports. 5477 */ 5478 public static class MarginLayoutParams extends ViewGroup.LayoutParams { 5479 /** 5480 * The left margin in pixels of the child. 5481 * Call {@link ViewGroup#setLayoutParams(LayoutParams)} after reassigning a new value 5482 * to this field. 5483 */ 5484 @ViewDebug.ExportedProperty(category = "layout") 5485 public int leftMargin; 5486 5487 /** 5488 * The top margin in pixels of the child. 5489 * Call {@link ViewGroup#setLayoutParams(LayoutParams)} after reassigning a new value 5490 * to this field. 5491 */ 5492 @ViewDebug.ExportedProperty(category = "layout") 5493 public int topMargin; 5494 5495 /** 5496 * The right margin in pixels of the child. 5497 * Call {@link ViewGroup#setLayoutParams(LayoutParams)} after reassigning a new value 5498 * to this field. 5499 */ 5500 @ViewDebug.ExportedProperty(category = "layout") 5501 public int rightMargin; 5502 5503 /** 5504 * The bottom margin in pixels of the child. 5505 * Call {@link ViewGroup#setLayoutParams(LayoutParams)} after reassigning a new value 5506 * to this field. 5507 */ 5508 @ViewDebug.ExportedProperty(category = "layout") 5509 public int bottomMargin; 5510 5511 /** 5512 * The start margin in pixels of the child. 5513 * Call {@link ViewGroup#setLayoutParams(LayoutParams)} after reassigning a new value 5514 * to this field. 5515 */ 5516 @ViewDebug.ExportedProperty(category = "layout") 5517 public int startMargin = DEFAULT_RELATIVE; 5518 5519 /** 5520 * The end margin in pixels of the child. 5521 * Call {@link ViewGroup#setLayoutParams(LayoutParams)} after reassigning a new value 5522 * to this field. 5523 */ 5524 @ViewDebug.ExportedProperty(category = "layout") 5525 public int endMargin = DEFAULT_RELATIVE; 5526 5527 /** 5528 * The default start and end margin. 5529 * @hide 5530 */ 5531 public static final int DEFAULT_RELATIVE = Integer.MIN_VALUE; 5532 5533 private int initialLeftMargin; 5534 private int initialRightMargin; 5535 5536 private static int LAYOUT_DIRECTION_UNDEFINED = -1; 5537 5538 // Layout direction undefined by default 5539 private int layoutDirection = LAYOUT_DIRECTION_UNDEFINED; 5540 5541 /** 5542 * Creates a new set of layout parameters. The values are extracted from 5543 * the supplied attributes set and context. 5544 * 5545 * @param c the application environment 5546 * @param attrs the set of attributes from which to extract the layout 5547 * parameters' values 5548 */ 5549 public MarginLayoutParams(Context c, AttributeSet attrs) { 5550 super(); 5551 5552 TypedArray a = c.obtainStyledAttributes(attrs, R.styleable.ViewGroup_MarginLayout); 5553 setBaseAttributes(a, 5554 R.styleable.ViewGroup_MarginLayout_layout_width, 5555 R.styleable.ViewGroup_MarginLayout_layout_height); 5556 5557 int margin = a.getDimensionPixelSize( 5558 com.android.internal.R.styleable.ViewGroup_MarginLayout_layout_margin, -1); 5559 if (margin >= 0) { 5560 leftMargin = margin; 5561 topMargin = margin; 5562 rightMargin= margin; 5563 bottomMargin = margin; 5564 } else { 5565 leftMargin = a.getDimensionPixelSize( 5566 R.styleable.ViewGroup_MarginLayout_layout_marginLeft, 0); 5567 topMargin = a.getDimensionPixelSize( 5568 R.styleable.ViewGroup_MarginLayout_layout_marginTop, 0); 5569 rightMargin = a.getDimensionPixelSize( 5570 R.styleable.ViewGroup_MarginLayout_layout_marginRight, 0); 5571 bottomMargin = a.getDimensionPixelSize( 5572 R.styleable.ViewGroup_MarginLayout_layout_marginBottom, 0); 5573 startMargin = a.getDimensionPixelSize( 5574 R.styleable.ViewGroup_MarginLayout_layout_marginStart, DEFAULT_RELATIVE); 5575 endMargin = a.getDimensionPixelSize( 5576 R.styleable.ViewGroup_MarginLayout_layout_marginEnd, DEFAULT_RELATIVE); 5577 } 5578 5579 initialLeftMargin = leftMargin; 5580 initialRightMargin = rightMargin; 5581 5582 a.recycle(); 5583 } 5584 5585 /** 5586 * {@inheritDoc} 5587 */ 5588 public MarginLayoutParams(int width, int height) { 5589 super(width, height); 5590 } 5591 5592 /** 5593 * Copy constructor. Clones the width, height and margin values of the source. 5594 * 5595 * @param source The layout params to copy from. 5596 */ 5597 public MarginLayoutParams(MarginLayoutParams source) { 5598 this.width = source.width; 5599 this.height = source.height; 5600 5601 this.leftMargin = source.leftMargin; 5602 this.topMargin = source.topMargin; 5603 this.rightMargin = source.rightMargin; 5604 this.bottomMargin = source.bottomMargin; 5605 this.startMargin = source.startMargin; 5606 this.endMargin = source.endMargin; 5607 5608 this.initialLeftMargin = source.leftMargin; 5609 this.initialRightMargin = source.rightMargin; 5610 5611 setLayoutDirection(source.layoutDirection); 5612 } 5613 5614 /** 5615 * {@inheritDoc} 5616 */ 5617 public MarginLayoutParams(LayoutParams source) { 5618 super(source); 5619 } 5620 5621 /** 5622 * Sets the margins, in pixels. A call to {@link android.view.View#requestLayout()} needs 5623 * to be done so that the new margins are taken into account. Left and right margins may be 5624 * overriden by {@link android.view.View#requestLayout()} depending on layout direction. 5625 * 5626 * @param left the left margin size 5627 * @param top the top margin size 5628 * @param right the right margin size 5629 * @param bottom the bottom margin size 5630 * 5631 * @attr ref android.R.styleable#ViewGroup_MarginLayout_layout_marginLeft 5632 * @attr ref android.R.styleable#ViewGroup_MarginLayout_layout_marginTop 5633 * @attr ref android.R.styleable#ViewGroup_MarginLayout_layout_marginRight 5634 * @attr ref android.R.styleable#ViewGroup_MarginLayout_layout_marginBottom 5635 */ 5636 public void setMargins(int left, int top, int right, int bottom) { 5637 leftMargin = left; 5638 topMargin = top; 5639 rightMargin = right; 5640 bottomMargin = bottom; 5641 initialLeftMargin = left; 5642 initialRightMargin = right; 5643 } 5644 5645 /** 5646 * Sets the relative margins, in pixels. A call to {@link android.view.View#requestLayout()} 5647 * needs to be done so that the new relative margins are taken into account. Left and right 5648 * margins may be overriden by {@link android.view.View#requestLayout()} depending on layout 5649 * direction. 5650 * 5651 * @param start the start margin size 5652 * @param top the top margin size 5653 * @param end the right margin size 5654 * @param bottom the bottom margin size 5655 * 5656 * @attr ref android.R.styleable#ViewGroup_MarginLayout_layout_marginStart 5657 * @attr ref android.R.styleable#ViewGroup_MarginLayout_layout_marginTop 5658 * @attr ref android.R.styleable#ViewGroup_MarginLayout_layout_marginEnd 5659 * @attr ref android.R.styleable#ViewGroup_MarginLayout_layout_marginBottom 5660 * 5661 * @hide 5662 */ 5663 public void setMarginsRelative(int start, int top, int end, int bottom) { 5664 startMargin = start; 5665 topMargin = top; 5666 endMargin = end; 5667 bottomMargin = bottom; 5668 initialLeftMargin = 0; 5669 initialRightMargin = 0; 5670 } 5671 5672 /** 5673 * Returns the start margin in pixels. 5674 * 5675 * @attr ref android.R.styleable#ViewGroup_MarginLayout_layout_marginStart 5676 * 5677 * @return the start margin in pixels. 5678 */ 5679 public int getMarginStart() { 5680 if (startMargin != DEFAULT_RELATIVE) return startMargin; 5681 switch(layoutDirection) { 5682 case View.LAYOUT_DIRECTION_RTL: 5683 return rightMargin; 5684 case View.LAYOUT_DIRECTION_LTR: 5685 default: 5686 return leftMargin; 5687 } 5688 } 5689 5690 /** 5691 * Returns the end margin in pixels. 5692 * 5693 * @attr ref android.R.styleable#ViewGroup_MarginLayout_layout_marginEnd 5694 * 5695 * @return the end margin in pixels. 5696 */ 5697 public int getMarginEnd() { 5698 if (endMargin != DEFAULT_RELATIVE) return endMargin; 5699 switch(layoutDirection) { 5700 case View.LAYOUT_DIRECTION_RTL: 5701 return leftMargin; 5702 case View.LAYOUT_DIRECTION_LTR: 5703 default: 5704 return rightMargin; 5705 } 5706 } 5707 5708 /** 5709 * Check if margins are relative. 5710 * 5711 * @attr ref android.R.styleable#ViewGroup_MarginLayout_layout_marginStart 5712 * @attr ref android.R.styleable#ViewGroup_MarginLayout_layout_marginEnd 5713 * 5714 * @return true if either marginStart or marginEnd has been set. 5715 */ 5716 public boolean isMarginRelative() { 5717 return (startMargin != DEFAULT_RELATIVE) || (endMargin != DEFAULT_RELATIVE); 5718 } 5719 5720 /** 5721 * Set the layout direction 5722 * @param layoutDirection the layout direction. 5723 * Should be either {@link View#LAYOUT_DIRECTION_LTR} 5724 * or {@link View#LAYOUT_DIRECTION_RTL}. 5725 */ 5726 public void setLayoutDirection(int layoutDirection) { 5727 if (layoutDirection != View.LAYOUT_DIRECTION_LTR && 5728 layoutDirection != View.LAYOUT_DIRECTION_RTL) return; 5729 this.layoutDirection = layoutDirection; 5730 } 5731 5732 /** 5733 * Retuns the layout direction. Can be either {@link View#LAYOUT_DIRECTION_LTR} or 5734 * {@link View#LAYOUT_DIRECTION_RTL}. 5735 * 5736 * @return the layout direction. 5737 */ 5738 public int getLayoutDirection() { 5739 return layoutDirection; 5740 } 5741 5742 /** 5743 * This will be called by {@link android.view.View#requestLayout()}. Left and Right margins 5744 * may be overridden depending on layout direction. 5745 */ 5746 @Override 5747 public void onResolveLayoutDirection(int layoutDirection) { 5748 setLayoutDirection(layoutDirection); 5749 5750 if (!isMarginRelative()) return; 5751 5752 switch(layoutDirection) { 5753 case View.LAYOUT_DIRECTION_RTL: 5754 leftMargin = (endMargin > DEFAULT_RELATIVE) ? endMargin : initialLeftMargin; 5755 rightMargin = (startMargin > DEFAULT_RELATIVE) ? startMargin : initialRightMargin; 5756 break; 5757 case View.LAYOUT_DIRECTION_LTR: 5758 default: 5759 leftMargin = (startMargin > DEFAULT_RELATIVE) ? startMargin : initialLeftMargin; 5760 rightMargin = (endMargin > DEFAULT_RELATIVE) ? endMargin : initialRightMargin; 5761 break; 5762 } 5763 } 5764 5765 protected boolean isLayoutRtl() { 5766 return (layoutDirection == View.LAYOUT_DIRECTION_RTL); 5767 } 5768 5769 /** 5770 * @hide 5771 */ 5772 @Override 5773 public void onDebugDraw(View view, Canvas canvas) { 5774 drawRect(canvas, 5775 view.getLeft() - leftMargin, 5776 view.getTop() - topMargin, 5777 view.getRight() + rightMargin, 5778 view.getBottom() + bottomMargin, Color.MAGENTA); 5779 } 5780 } 5781 5782 /* Describes a touched view and the ids of the pointers that it has captured. 5783 * 5784 * This code assumes that pointer ids are always in the range 0..31 such that 5785 * it can use a bitfield to track which pointer ids are present. 5786 * As it happens, the lower layers of the input dispatch pipeline also use the 5787 * same trick so the assumption should be safe here... 5788 */ 5789 private static final class TouchTarget { 5790 private static final int MAX_RECYCLED = 32; 5791 private static final Object sRecycleLock = new Object(); 5792 private static TouchTarget sRecycleBin; 5793 private static int sRecycledCount; 5794 5795 public static final int ALL_POINTER_IDS = -1; // all ones 5796 5797 // The touched child view. 5798 public View child; 5799 5800 // The combined bit mask of pointer ids for all pointers captured by the target. 5801 public int pointerIdBits; 5802 5803 // The next target in the target list. 5804 public TouchTarget next; 5805 5806 private TouchTarget() { 5807 } 5808 5809 public static TouchTarget obtain(View child, int pointerIdBits) { 5810 final TouchTarget target; 5811 synchronized (sRecycleLock) { 5812 if (sRecycleBin == null) { 5813 target = new TouchTarget(); 5814 } else { 5815 target = sRecycleBin; 5816 sRecycleBin = target.next; 5817 sRecycledCount--; 5818 target.next = null; 5819 } 5820 } 5821 target.child = child; 5822 target.pointerIdBits = pointerIdBits; 5823 return target; 5824 } 5825 5826 public void recycle() { 5827 synchronized (sRecycleLock) { 5828 if (sRecycledCount < MAX_RECYCLED) { 5829 next = sRecycleBin; 5830 sRecycleBin = this; 5831 sRecycledCount += 1; 5832 } else { 5833 next = null; 5834 } 5835 child = null; 5836 } 5837 } 5838 } 5839 5840 /* Describes a hovered view. */ 5841 private static final class HoverTarget { 5842 private static final int MAX_RECYCLED = 32; 5843 private static final Object sRecycleLock = new Object(); 5844 private static HoverTarget sRecycleBin; 5845 private static int sRecycledCount; 5846 5847 // The hovered child view. 5848 public View child; 5849 5850 // The next target in the target list. 5851 public HoverTarget next; 5852 5853 private HoverTarget() { 5854 } 5855 5856 public static HoverTarget obtain(View child) { 5857 final HoverTarget target; 5858 synchronized (sRecycleLock) { 5859 if (sRecycleBin == null) { 5860 target = new HoverTarget(); 5861 } else { 5862 target = sRecycleBin; 5863 sRecycleBin = target.next; 5864 sRecycledCount--; 5865 target.next = null; 5866 } 5867 } 5868 target.child = child; 5869 return target; 5870 } 5871 5872 public void recycle() { 5873 synchronized (sRecycleLock) { 5874 if (sRecycledCount < MAX_RECYCLED) { 5875 next = sRecycleBin; 5876 sRecycleBin = this; 5877 sRecycledCount += 1; 5878 } else { 5879 next = null; 5880 } 5881 child = null; 5882 } 5883 } 5884 } 5885 5886 /** 5887 * Pooled class that orderes the children of a ViewGroup from start 5888 * to end based on how they are laid out and the layout direction. 5889 */ 5890 static class ChildListForAccessibility { 5891 5892 private static final int MAX_POOL_SIZE = 32; 5893 5894 private static final Object sPoolLock = new Object(); 5895 5896 private static ChildListForAccessibility sPool; 5897 5898 private static int sPoolSize; 5899 5900 private boolean mIsPooled; 5901 5902 private ChildListForAccessibility mNext; 5903 5904 private final ArrayList<View> mChildren = new ArrayList<View>(); 5905 5906 private final ArrayList<ViewLocationHolder> mHolders = new ArrayList<ViewLocationHolder>(); 5907 5908 public static ChildListForAccessibility obtain(ViewGroup parent, boolean sort) { 5909 ChildListForAccessibility list = null; 5910 synchronized (sPoolLock) { 5911 if (sPool != null) { 5912 list = sPool; 5913 sPool = list.mNext; 5914 list.mNext = null; 5915 list.mIsPooled = false; 5916 sPoolSize--; 5917 } else { 5918 list = new ChildListForAccessibility(); 5919 } 5920 list.init(parent, sort); 5921 return list; 5922 } 5923 } 5924 5925 public void recycle() { 5926 if (mIsPooled) { 5927 throw new IllegalStateException("Instance already recycled."); 5928 } 5929 clear(); 5930 synchronized (sPoolLock) { 5931 if (sPoolSize < MAX_POOL_SIZE) { 5932 mNext = sPool; 5933 mIsPooled = true; 5934 sPool = this; 5935 sPoolSize++; 5936 } 5937 } 5938 } 5939 5940 public int getChildCount() { 5941 return mChildren.size(); 5942 } 5943 5944 public View getChildAt(int index) { 5945 return mChildren.get(index); 5946 } 5947 5948 public int getChildIndex(View child) { 5949 return mChildren.indexOf(child); 5950 } 5951 5952 private void init(ViewGroup parent, boolean sort) { 5953 ArrayList<View> children = mChildren; 5954 final int childCount = parent.getChildCount(); 5955 for (int i = 0; i < childCount; i++) { 5956 View child = parent.getChildAt(i); 5957 children.add(child); 5958 } 5959 if (sort) { 5960 ArrayList<ViewLocationHolder> holders = mHolders; 5961 for (int i = 0; i < childCount; i++) { 5962 View child = children.get(i); 5963 ViewLocationHolder holder = ViewLocationHolder.obtain(parent, child); 5964 holders.add(holder); 5965 } 5966 Collections.sort(holders); 5967 for (int i = 0; i < childCount; i++) { 5968 ViewLocationHolder holder = holders.get(i); 5969 children.set(i, holder.mView); 5970 holder.recycle(); 5971 } 5972 holders.clear(); 5973 } 5974 } 5975 5976 private void clear() { 5977 mChildren.clear(); 5978 } 5979 } 5980 5981 /** 5982 * Pooled class that holds a View and its location with respect to 5983 * a specified root. This enables sorting of views based on their 5984 * coordinates without recomputing the position relative to the root 5985 * on every comparison. 5986 */ 5987 static class ViewLocationHolder implements Comparable<ViewLocationHolder> { 5988 5989 private static final int MAX_POOL_SIZE = 32; 5990 5991 private static final Object sPoolLock = new Object(); 5992 5993 private static ViewLocationHolder sPool; 5994 5995 private static int sPoolSize; 5996 5997 private boolean mIsPooled; 5998 5999 private ViewLocationHolder mNext; 6000 6001 private final Rect mLocation = new Rect(); 6002 6003 public View mView; 6004 6005 private int mLayoutDirection; 6006 6007 public static ViewLocationHolder obtain(ViewGroup root, View view) { 6008 ViewLocationHolder holder = null; 6009 synchronized (sPoolLock) { 6010 if (sPool != null) { 6011 holder = sPool; 6012 sPool = holder.mNext; 6013 holder.mNext = null; 6014 holder.mIsPooled = false; 6015 sPoolSize--; 6016 } else { 6017 holder = new ViewLocationHolder(); 6018 } 6019 holder.init(root, view); 6020 return holder; 6021 } 6022 } 6023 6024 public void recycle() { 6025 if (mIsPooled) { 6026 throw new IllegalStateException("Instance already recycled."); 6027 } 6028 clear(); 6029 synchronized (sPoolLock) { 6030 if (sPoolSize < MAX_POOL_SIZE) { 6031 mNext = sPool; 6032 mIsPooled = true; 6033 sPool = this; 6034 sPoolSize++; 6035 } 6036 } 6037 } 6038 6039 @Override 6040 public int compareTo(ViewLocationHolder another) { 6041 // This instance is greater than an invalid argument. 6042 if (another == null) { 6043 return 1; 6044 } 6045 if (getClass() != another.getClass()) { 6046 return 1; 6047 } 6048 // First is above second. 6049 if (mLocation.bottom - another.mLocation.top <= 0) { 6050 return -1; 6051 } 6052 // First is below second. 6053 if (mLocation.top - another.mLocation.bottom >= 0) { 6054 return 1; 6055 } 6056 // LTR 6057 if (mLayoutDirection == LAYOUT_DIRECTION_LTR) { 6058 final int leftDifference = mLocation.left - another.mLocation.left; 6059 // First more to the left than second. 6060 if (leftDifference != 0) { 6061 return leftDifference; 6062 } 6063 } else { // RTL 6064 final int rightDifference = mLocation.right - another.mLocation.right; 6065 // First more to the right than second. 6066 if (rightDifference != 0) { 6067 return -rightDifference; 6068 } 6069 } 6070 // Break tie by top. 6071 final int topDiference = mLocation.top - another.mLocation.top; 6072 if (topDiference != 0) { 6073 return topDiference; 6074 } 6075 // Break tie by height. 6076 final int heightDiference = mLocation.height() - another.mLocation.height(); 6077 if (heightDiference != 0) { 6078 return -heightDiference; 6079 } 6080 // Break tie by width. 6081 final int widthDiference = mLocation.width() - another.mLocation.width(); 6082 if (widthDiference != 0) { 6083 return -widthDiference; 6084 } 6085 // Just break the tie somehow. The accessibliity ids are unique 6086 // and stable, hence this is deterministic tie breaking. 6087 return mView.getAccessibilityViewId() - another.mView.getAccessibilityViewId(); 6088 } 6089 6090 private void init(ViewGroup root, View view) { 6091 Rect viewLocation = mLocation; 6092 view.getDrawingRect(viewLocation); 6093 root.offsetDescendantRectToMyCoords(view, viewLocation); 6094 mView = view; 6095 mLayoutDirection = root.getResolvedLayoutDirection(); 6096 } 6097 6098 private void clear() { 6099 mView = null; 6100 mLocation.set(0, 0, 0, 0); 6101 } 6102 } 6103 6104 private static Paint getDebugPaint() { 6105 if (sDebugPaint == null) { 6106 sDebugPaint = new Paint(); 6107 sDebugPaint.setAntiAlias(false); 6108 } 6109 return sDebugPaint; 6110 } 6111 6112 private static float[] getDebugLines(int x1, int y1, int x2, int y2) { 6113 if (sDebugLines== null) { 6114 sDebugLines = new float[16]; 6115 } 6116 6117 x2--; 6118 y2--; 6119 6120 sDebugLines[0] = x1; 6121 sDebugLines[1] = y1; 6122 sDebugLines[2] = x2; 6123 sDebugLines[3] = y1; 6124 6125 sDebugLines[4] = x2; 6126 sDebugLines[5] = y1; 6127 sDebugLines[6] = x2; 6128 sDebugLines[7] = y2 + 1; 6129 6130 sDebugLines[8] = x2 + 1; 6131 sDebugLines[9] = y2; 6132 sDebugLines[10] = x1; 6133 sDebugLines[11] = y2; 6134 6135 sDebugLines[12] = x1; 6136 sDebugLines[13] = y2; 6137 sDebugLines[14] = x1; 6138 sDebugLines[15] = y1; 6139 6140 return sDebugLines; 6141 } 6142} 6143