ViewGroup.java revision dcf59629beed8182759a1068ab8ee997935bef82
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 & PFLAG_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 & PFLAG_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.PFLAG2_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.PFLAG2_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.PFLAG2_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.PFLAG2_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 & (PFLAG_FOCUSED | PFLAG_HAS_BOUNDS)) 1334 == (PFLAG_FOCUSED | PFLAG_HAS_BOUNDS)) { 1335 return super.dispatchKeyEventPreIme(event); 1336 } else if (mFocused != null && (mFocused.mPrivateFlags & PFLAG_HAS_BOUNDS) 1337 == PFLAG_HAS_BOUNDS) { 1338 return mFocused.dispatchKeyEventPreIme(event); 1339 } 1340 return false; 1341 } 1342 1343 /** 1344 * {@inheritDoc} 1345 */ 1346 @Override 1347 public boolean dispatchKeyEvent(KeyEvent event) { 1348 if (mInputEventConsistencyVerifier != null) { 1349 mInputEventConsistencyVerifier.onKeyEvent(event, 1); 1350 } 1351 1352 if ((mPrivateFlags & (PFLAG_FOCUSED | PFLAG_HAS_BOUNDS)) 1353 == (PFLAG_FOCUSED | PFLAG_HAS_BOUNDS)) { 1354 if (super.dispatchKeyEvent(event)) { 1355 return true; 1356 } 1357 } else if (mFocused != null && (mFocused.mPrivateFlags & PFLAG_HAS_BOUNDS) 1358 == PFLAG_HAS_BOUNDS) { 1359 if (mFocused.dispatchKeyEvent(event)) { 1360 return true; 1361 } 1362 } 1363 1364 if (mInputEventConsistencyVerifier != null) { 1365 mInputEventConsistencyVerifier.onUnhandledEvent(event, 1); 1366 } 1367 return false; 1368 } 1369 1370 /** 1371 * {@inheritDoc} 1372 */ 1373 @Override 1374 public boolean dispatchKeyShortcutEvent(KeyEvent event) { 1375 if ((mPrivateFlags & (PFLAG_FOCUSED | PFLAG_HAS_BOUNDS)) 1376 == (PFLAG_FOCUSED | PFLAG_HAS_BOUNDS)) { 1377 return super.dispatchKeyShortcutEvent(event); 1378 } else if (mFocused != null && (mFocused.mPrivateFlags & PFLAG_HAS_BOUNDS) 1379 == PFLAG_HAS_BOUNDS) { 1380 return mFocused.dispatchKeyShortcutEvent(event); 1381 } 1382 return false; 1383 } 1384 1385 /** 1386 * {@inheritDoc} 1387 */ 1388 @Override 1389 public boolean dispatchTrackballEvent(MotionEvent event) { 1390 if (mInputEventConsistencyVerifier != null) { 1391 mInputEventConsistencyVerifier.onTrackballEvent(event, 1); 1392 } 1393 1394 if ((mPrivateFlags & (PFLAG_FOCUSED | PFLAG_HAS_BOUNDS)) 1395 == (PFLAG_FOCUSED | PFLAG_HAS_BOUNDS)) { 1396 if (super.dispatchTrackballEvent(event)) { 1397 return true; 1398 } 1399 } else if (mFocused != null && (mFocused.mPrivateFlags & PFLAG_HAS_BOUNDS) 1400 == PFLAG_HAS_BOUNDS) { 1401 if (mFocused.dispatchTrackballEvent(event)) { 1402 return true; 1403 } 1404 } 1405 1406 if (mInputEventConsistencyVerifier != null) { 1407 mInputEventConsistencyVerifier.onUnhandledEvent(event, 1); 1408 } 1409 return false; 1410 } 1411 1412 /** 1413 * {@inheritDoc} 1414 */ 1415 @SuppressWarnings({"ConstantConditions"}) 1416 @Override 1417 protected boolean dispatchHoverEvent(MotionEvent event) { 1418 final int action = event.getAction(); 1419 1420 // First check whether the view group wants to intercept the hover event. 1421 final boolean interceptHover = onInterceptHoverEvent(event); 1422 event.setAction(action); // restore action in case it was changed 1423 1424 MotionEvent eventNoHistory = event; 1425 boolean handled = false; 1426 1427 // Send events to the hovered children and build a new list of hover targets until 1428 // one is found that handles the event. 1429 HoverTarget firstOldHoverTarget = mFirstHoverTarget; 1430 mFirstHoverTarget = null; 1431 if (!interceptHover && action != MotionEvent.ACTION_HOVER_EXIT) { 1432 final float x = event.getX(); 1433 final float y = event.getY(); 1434 final int childrenCount = mChildrenCount; 1435 if (childrenCount != 0) { 1436 final View[] children = mChildren; 1437 HoverTarget lastHoverTarget = null; 1438 for (int i = childrenCount - 1; i >= 0; i--) { 1439 final View child = children[i]; 1440 if (!canViewReceivePointerEvents(child) 1441 || !isTransformedTouchPointInView(x, y, child, null)) { 1442 continue; 1443 } 1444 1445 // Obtain a hover target for this child. Dequeue it from the 1446 // old hover target list if the child was previously hovered. 1447 HoverTarget hoverTarget = firstOldHoverTarget; 1448 final boolean wasHovered; 1449 for (HoverTarget predecessor = null; ;) { 1450 if (hoverTarget == null) { 1451 hoverTarget = HoverTarget.obtain(child); 1452 wasHovered = false; 1453 break; 1454 } 1455 1456 if (hoverTarget.child == child) { 1457 if (predecessor != null) { 1458 predecessor.next = hoverTarget.next; 1459 } else { 1460 firstOldHoverTarget = hoverTarget.next; 1461 } 1462 hoverTarget.next = null; 1463 wasHovered = true; 1464 break; 1465 } 1466 1467 predecessor = hoverTarget; 1468 hoverTarget = hoverTarget.next; 1469 } 1470 1471 // Enqueue the hover target onto the new hover target list. 1472 if (lastHoverTarget != null) { 1473 lastHoverTarget.next = hoverTarget; 1474 } else { 1475 lastHoverTarget = hoverTarget; 1476 mFirstHoverTarget = hoverTarget; 1477 } 1478 1479 // Dispatch the event to the child. 1480 if (action == MotionEvent.ACTION_HOVER_ENTER) { 1481 if (!wasHovered) { 1482 // Send the enter as is. 1483 handled |= dispatchTransformedGenericPointerEvent( 1484 event, child); // enter 1485 } 1486 } else if (action == MotionEvent.ACTION_HOVER_MOVE) { 1487 if (!wasHovered) { 1488 // Synthesize an enter from a move. 1489 eventNoHistory = obtainMotionEventNoHistoryOrSelf(eventNoHistory); 1490 eventNoHistory.setAction(MotionEvent.ACTION_HOVER_ENTER); 1491 handled |= dispatchTransformedGenericPointerEvent( 1492 eventNoHistory, child); // enter 1493 eventNoHistory.setAction(action); 1494 1495 handled |= dispatchTransformedGenericPointerEvent( 1496 eventNoHistory, child); // move 1497 } else { 1498 // Send the move as is. 1499 handled |= dispatchTransformedGenericPointerEvent(event, child); 1500 } 1501 } 1502 if (handled) { 1503 break; 1504 } 1505 } 1506 } 1507 } 1508 1509 // Send exit events to all previously hovered children that are no longer hovered. 1510 while (firstOldHoverTarget != null) { 1511 final View child = firstOldHoverTarget.child; 1512 1513 // Exit the old hovered child. 1514 if (action == MotionEvent.ACTION_HOVER_EXIT) { 1515 // Send the exit as is. 1516 handled |= dispatchTransformedGenericPointerEvent( 1517 event, child); // exit 1518 } else { 1519 // Synthesize an exit from a move or enter. 1520 // Ignore the result because hover focus has moved to a different view. 1521 if (action == MotionEvent.ACTION_HOVER_MOVE) { 1522 dispatchTransformedGenericPointerEvent( 1523 event, child); // move 1524 } 1525 eventNoHistory = obtainMotionEventNoHistoryOrSelf(eventNoHistory); 1526 eventNoHistory.setAction(MotionEvent.ACTION_HOVER_EXIT); 1527 dispatchTransformedGenericPointerEvent( 1528 eventNoHistory, child); // exit 1529 eventNoHistory.setAction(action); 1530 } 1531 1532 final HoverTarget nextOldHoverTarget = firstOldHoverTarget.next; 1533 firstOldHoverTarget.recycle(); 1534 firstOldHoverTarget = nextOldHoverTarget; 1535 } 1536 1537 // Send events to the view group itself if no children have handled it. 1538 boolean newHoveredSelf = !handled; 1539 if (newHoveredSelf == mHoveredSelf) { 1540 if (newHoveredSelf) { 1541 // Send event to the view group as before. 1542 handled |= super.dispatchHoverEvent(event); 1543 } 1544 } else { 1545 if (mHoveredSelf) { 1546 // Exit the view group. 1547 if (action == MotionEvent.ACTION_HOVER_EXIT) { 1548 // Send the exit as is. 1549 handled |= super.dispatchHoverEvent(event); // exit 1550 } else { 1551 // Synthesize an exit from a move or enter. 1552 // Ignore the result because hover focus is moving to a different view. 1553 if (action == MotionEvent.ACTION_HOVER_MOVE) { 1554 super.dispatchHoverEvent(event); // move 1555 } 1556 eventNoHistory = obtainMotionEventNoHistoryOrSelf(eventNoHistory); 1557 eventNoHistory.setAction(MotionEvent.ACTION_HOVER_EXIT); 1558 super.dispatchHoverEvent(eventNoHistory); // exit 1559 eventNoHistory.setAction(action); 1560 } 1561 mHoveredSelf = false; 1562 } 1563 1564 if (newHoveredSelf) { 1565 // Enter the view group. 1566 if (action == MotionEvent.ACTION_HOVER_ENTER) { 1567 // Send the enter as is. 1568 handled |= super.dispatchHoverEvent(event); // enter 1569 mHoveredSelf = true; 1570 } else if (action == MotionEvent.ACTION_HOVER_MOVE) { 1571 // Synthesize an enter from a move. 1572 eventNoHistory = obtainMotionEventNoHistoryOrSelf(eventNoHistory); 1573 eventNoHistory.setAction(MotionEvent.ACTION_HOVER_ENTER); 1574 handled |= super.dispatchHoverEvent(eventNoHistory); // enter 1575 eventNoHistory.setAction(action); 1576 1577 handled |= super.dispatchHoverEvent(eventNoHistory); // move 1578 mHoveredSelf = true; 1579 } 1580 } 1581 } 1582 1583 // Recycle the copy of the event that we made. 1584 if (eventNoHistory != event) { 1585 eventNoHistory.recycle(); 1586 } 1587 1588 // Done. 1589 return handled; 1590 } 1591 1592 private void exitHoverTargets() { 1593 if (mHoveredSelf || mFirstHoverTarget != null) { 1594 final long now = SystemClock.uptimeMillis(); 1595 MotionEvent event = MotionEvent.obtain(now, now, 1596 MotionEvent.ACTION_HOVER_EXIT, 0.0f, 0.0f, 0); 1597 event.setSource(InputDevice.SOURCE_TOUCHSCREEN); 1598 dispatchHoverEvent(event); 1599 event.recycle(); 1600 } 1601 } 1602 1603 private void cancelHoverTarget(View view) { 1604 HoverTarget predecessor = null; 1605 HoverTarget target = mFirstHoverTarget; 1606 while (target != null) { 1607 final HoverTarget next = target.next; 1608 if (target.child == view) { 1609 if (predecessor == null) { 1610 mFirstHoverTarget = next; 1611 } else { 1612 predecessor.next = next; 1613 } 1614 target.recycle(); 1615 1616 final long now = SystemClock.uptimeMillis(); 1617 MotionEvent event = MotionEvent.obtain(now, now, 1618 MotionEvent.ACTION_HOVER_EXIT, 0.0f, 0.0f, 0); 1619 event.setSource(InputDevice.SOURCE_TOUCHSCREEN); 1620 view.dispatchHoverEvent(event); 1621 event.recycle(); 1622 return; 1623 } 1624 predecessor = target; 1625 target = next; 1626 } 1627 } 1628 1629 /** @hide */ 1630 @Override 1631 protected boolean hasHoveredChild() { 1632 return mFirstHoverTarget != null; 1633 } 1634 1635 @Override 1636 public void addChildrenForAccessibility(ArrayList<View> childrenForAccessibility) { 1637 ChildListForAccessibility children = ChildListForAccessibility.obtain(this, true); 1638 try { 1639 final int childrenCount = children.getChildCount(); 1640 for (int i = 0; i < childrenCount; i++) { 1641 View child = children.getChildAt(i); 1642 if ((child.mViewFlags & VISIBILITY_MASK) == VISIBLE) { 1643 if (child.includeForAccessibility()) { 1644 childrenForAccessibility.add(child); 1645 } else { 1646 child.addChildrenForAccessibility(childrenForAccessibility); 1647 } 1648 } 1649 } 1650 } finally { 1651 children.recycle(); 1652 } 1653 } 1654 1655 /** 1656 * @hide 1657 */ 1658 @Override 1659 public void childAccessibilityStateChanged(View child) { 1660 if (mParent != null) { 1661 mParent.childAccessibilityStateChanged(child); 1662 } 1663 } 1664 1665 /** 1666 * Implement this method to intercept hover events before they are handled 1667 * by child views. 1668 * <p> 1669 * This method is called before dispatching a hover event to a child of 1670 * the view group or to the view group's own {@link #onHoverEvent} to allow 1671 * the view group a chance to intercept the hover event. 1672 * This method can also be used to watch all pointer motions that occur within 1673 * the bounds of the view group even when the pointer is hovering over 1674 * a child of the view group rather than over the view group itself. 1675 * </p><p> 1676 * The view group can prevent its children from receiving hover events by 1677 * implementing this method and returning <code>true</code> to indicate 1678 * that it would like to intercept hover events. The view group must 1679 * continuously return <code>true</code> from {@link #onInterceptHoverEvent} 1680 * for as long as it wishes to continue intercepting hover events from 1681 * its children. 1682 * </p><p> 1683 * Interception preserves the invariant that at most one view can be 1684 * hovered at a time by transferring hover focus from the currently hovered 1685 * child to the view group or vice-versa as needed. 1686 * </p><p> 1687 * If this method returns <code>true</code> and a child is already hovered, then the 1688 * child view will first receive a hover exit event and then the view group 1689 * itself will receive a hover enter event in {@link #onHoverEvent}. 1690 * Likewise, if this method had previously returned <code>true</code> to intercept hover 1691 * events and instead returns <code>false</code> while the pointer is hovering 1692 * within the bounds of one of a child, then the view group will first receive a 1693 * hover exit event in {@link #onHoverEvent} and then the hovered child will 1694 * receive a hover enter event. 1695 * </p><p> 1696 * The default implementation always returns false. 1697 * </p> 1698 * 1699 * @param event The motion event that describes the hover. 1700 * @return True if the view group would like to intercept the hover event 1701 * and prevent its children from receiving it. 1702 */ 1703 public boolean onInterceptHoverEvent(MotionEvent event) { 1704 return false; 1705 } 1706 1707 private static MotionEvent obtainMotionEventNoHistoryOrSelf(MotionEvent event) { 1708 if (event.getHistorySize() == 0) { 1709 return event; 1710 } 1711 return MotionEvent.obtainNoHistory(event); 1712 } 1713 1714 /** 1715 * {@inheritDoc} 1716 */ 1717 @Override 1718 protected boolean dispatchGenericPointerEvent(MotionEvent event) { 1719 // Send the event to the child under the pointer. 1720 final int childrenCount = mChildrenCount; 1721 if (childrenCount != 0) { 1722 final View[] children = mChildren; 1723 final float x = event.getX(); 1724 final float y = event.getY(); 1725 1726 final boolean customOrder = isChildrenDrawingOrderEnabled(); 1727 for (int i = childrenCount - 1; i >= 0; i--) { 1728 final int childIndex = customOrder ? getChildDrawingOrder(childrenCount, i) : i; 1729 final View child = children[childIndex]; 1730 if (!canViewReceivePointerEvents(child) 1731 || !isTransformedTouchPointInView(x, y, child, null)) { 1732 continue; 1733 } 1734 1735 if (dispatchTransformedGenericPointerEvent(event, child)) { 1736 return true; 1737 } 1738 } 1739 } 1740 1741 // No child handled the event. Send it to this view group. 1742 return super.dispatchGenericPointerEvent(event); 1743 } 1744 1745 /** 1746 * {@inheritDoc} 1747 */ 1748 @Override 1749 protected boolean dispatchGenericFocusedEvent(MotionEvent event) { 1750 // Send the event to the focused child or to this view group if it has focus. 1751 if ((mPrivateFlags & (PFLAG_FOCUSED | PFLAG_HAS_BOUNDS)) 1752 == (PFLAG_FOCUSED | PFLAG_HAS_BOUNDS)) { 1753 return super.dispatchGenericFocusedEvent(event); 1754 } else if (mFocused != null && (mFocused.mPrivateFlags & PFLAG_HAS_BOUNDS) 1755 == PFLAG_HAS_BOUNDS) { 1756 return mFocused.dispatchGenericMotionEvent(event); 1757 } 1758 return false; 1759 } 1760 1761 /** 1762 * Dispatches a generic pointer event to a child, taking into account 1763 * transformations that apply to the child. 1764 * 1765 * @param event The event to send. 1766 * @param child The view to send the event to. 1767 * @return {@code true} if the child handled the event. 1768 */ 1769 private boolean dispatchTransformedGenericPointerEvent(MotionEvent event, View child) { 1770 final float offsetX = mScrollX - child.mLeft; 1771 final float offsetY = mScrollY - child.mTop; 1772 1773 boolean handled; 1774 if (!child.hasIdentityMatrix()) { 1775 MotionEvent transformedEvent = MotionEvent.obtain(event); 1776 transformedEvent.offsetLocation(offsetX, offsetY); 1777 transformedEvent.transform(child.getInverseMatrix()); 1778 handled = child.dispatchGenericMotionEvent(transformedEvent); 1779 transformedEvent.recycle(); 1780 } else { 1781 event.offsetLocation(offsetX, offsetY); 1782 handled = child.dispatchGenericMotionEvent(event); 1783 event.offsetLocation(-offsetX, -offsetY); 1784 } 1785 return handled; 1786 } 1787 1788 /** 1789 * {@inheritDoc} 1790 */ 1791 @Override 1792 public boolean dispatchTouchEvent(MotionEvent ev) { 1793 if (mInputEventConsistencyVerifier != null) { 1794 mInputEventConsistencyVerifier.onTouchEvent(ev, 1); 1795 } 1796 1797 boolean handled = false; 1798 if (onFilterTouchEventForSecurity(ev)) { 1799 final int action = ev.getAction(); 1800 final int actionMasked = action & MotionEvent.ACTION_MASK; 1801 1802 // Handle an initial down. 1803 if (actionMasked == MotionEvent.ACTION_DOWN) { 1804 // Throw away all previous state when starting a new touch gesture. 1805 // The framework may have dropped the up or cancel event for the previous gesture 1806 // due to an app switch, ANR, or some other state change. 1807 cancelAndClearTouchTargets(ev); 1808 resetTouchState(); 1809 } 1810 1811 // Check for interception. 1812 final boolean intercepted; 1813 if (actionMasked == MotionEvent.ACTION_DOWN 1814 || mFirstTouchTarget != null) { 1815 final boolean disallowIntercept = (mGroupFlags & FLAG_DISALLOW_INTERCEPT) != 0; 1816 if (!disallowIntercept) { 1817 intercepted = onInterceptTouchEvent(ev); 1818 ev.setAction(action); // restore action in case it was changed 1819 } else { 1820 intercepted = false; 1821 } 1822 } else { 1823 // There are no touch targets and this action is not an initial down 1824 // so this view group continues to intercept touches. 1825 intercepted = true; 1826 } 1827 1828 // Check for cancelation. 1829 final boolean canceled = resetCancelNextUpFlag(this) 1830 || actionMasked == MotionEvent.ACTION_CANCEL; 1831 1832 // Update list of touch targets for pointer down, if needed. 1833 final boolean split = (mGroupFlags & FLAG_SPLIT_MOTION_EVENTS) != 0; 1834 TouchTarget newTouchTarget = null; 1835 boolean alreadyDispatchedToNewTouchTarget = false; 1836 if (!canceled && !intercepted) { 1837 if (actionMasked == MotionEvent.ACTION_DOWN 1838 || (split && actionMasked == MotionEvent.ACTION_POINTER_DOWN) 1839 || actionMasked == MotionEvent.ACTION_HOVER_MOVE) { 1840 final int actionIndex = ev.getActionIndex(); // always 0 for down 1841 final int idBitsToAssign = split ? 1 << ev.getPointerId(actionIndex) 1842 : TouchTarget.ALL_POINTER_IDS; 1843 1844 // Clean up earlier touch targets for this pointer id in case they 1845 // have become out of sync. 1846 removePointersFromTouchTargets(idBitsToAssign); 1847 1848 final int childrenCount = mChildrenCount; 1849 if (childrenCount != 0) { 1850 // Find a child that can receive the event. 1851 // Scan children from front to back. 1852 final View[] children = mChildren; 1853 final float x = ev.getX(actionIndex); 1854 final float y = ev.getY(actionIndex); 1855 1856 final boolean customOrder = isChildrenDrawingOrderEnabled(); 1857 for (int i = childrenCount - 1; i >= 0; i--) { 1858 final int childIndex = customOrder ? 1859 getChildDrawingOrder(childrenCount, i) : i; 1860 final View child = children[childIndex]; 1861 if (!canViewReceivePointerEvents(child) 1862 || !isTransformedTouchPointInView(x, y, child, null)) { 1863 continue; 1864 } 1865 1866 newTouchTarget = getTouchTarget(child); 1867 if (newTouchTarget != null) { 1868 // Child is already receiving touch within its bounds. 1869 // Give it the new pointer in addition to the ones it is handling. 1870 newTouchTarget.pointerIdBits |= idBitsToAssign; 1871 break; 1872 } 1873 1874 resetCancelNextUpFlag(child); 1875 if (dispatchTransformedTouchEvent(ev, false, child, idBitsToAssign)) { 1876 // Child wants to receive touch within its bounds. 1877 mLastTouchDownTime = ev.getDownTime(); 1878 mLastTouchDownIndex = childIndex; 1879 mLastTouchDownX = ev.getX(); 1880 mLastTouchDownY = ev.getY(); 1881 newTouchTarget = addTouchTarget(child, idBitsToAssign); 1882 alreadyDispatchedToNewTouchTarget = true; 1883 break; 1884 } 1885 } 1886 } 1887 1888 if (newTouchTarget == null && mFirstTouchTarget != null) { 1889 // Did not find a child to receive the event. 1890 // Assign the pointer to the least recently added target. 1891 newTouchTarget = mFirstTouchTarget; 1892 while (newTouchTarget.next != null) { 1893 newTouchTarget = newTouchTarget.next; 1894 } 1895 newTouchTarget.pointerIdBits |= idBitsToAssign; 1896 } 1897 } 1898 } 1899 1900 // Dispatch to touch targets. 1901 if (mFirstTouchTarget == null) { 1902 // No touch targets so treat this as an ordinary view. 1903 handled = dispatchTransformedTouchEvent(ev, canceled, null, 1904 TouchTarget.ALL_POINTER_IDS); 1905 } else { 1906 // Dispatch to touch targets, excluding the new touch target if we already 1907 // dispatched to it. Cancel touch targets if necessary. 1908 TouchTarget predecessor = null; 1909 TouchTarget target = mFirstTouchTarget; 1910 while (target != null) { 1911 final TouchTarget next = target.next; 1912 if (alreadyDispatchedToNewTouchTarget && target == newTouchTarget) { 1913 handled = true; 1914 } else { 1915 final boolean cancelChild = resetCancelNextUpFlag(target.child) 1916 || intercepted; 1917 if (dispatchTransformedTouchEvent(ev, cancelChild, 1918 target.child, target.pointerIdBits)) { 1919 handled = true; 1920 } 1921 if (cancelChild) { 1922 if (predecessor == null) { 1923 mFirstTouchTarget = next; 1924 } else { 1925 predecessor.next = next; 1926 } 1927 target.recycle(); 1928 target = next; 1929 continue; 1930 } 1931 } 1932 predecessor = target; 1933 target = next; 1934 } 1935 } 1936 1937 // Update list of touch targets for pointer up or cancel, if needed. 1938 if (canceled 1939 || actionMasked == MotionEvent.ACTION_UP 1940 || actionMasked == MotionEvent.ACTION_HOVER_MOVE) { 1941 resetTouchState(); 1942 } else if (split && actionMasked == MotionEvent.ACTION_POINTER_UP) { 1943 final int actionIndex = ev.getActionIndex(); 1944 final int idBitsToRemove = 1 << ev.getPointerId(actionIndex); 1945 removePointersFromTouchTargets(idBitsToRemove); 1946 } 1947 } 1948 1949 if (!handled && mInputEventConsistencyVerifier != null) { 1950 mInputEventConsistencyVerifier.onUnhandledEvent(ev, 1); 1951 } 1952 return handled; 1953 } 1954 1955 /** 1956 * Resets all touch state in preparation for a new cycle. 1957 */ 1958 private void resetTouchState() { 1959 clearTouchTargets(); 1960 resetCancelNextUpFlag(this); 1961 mGroupFlags &= ~FLAG_DISALLOW_INTERCEPT; 1962 } 1963 1964 /** 1965 * Resets the cancel next up flag. 1966 * Returns true if the flag was previously set. 1967 */ 1968 private static boolean resetCancelNextUpFlag(View view) { 1969 if ((view.mPrivateFlags & PFLAG_CANCEL_NEXT_UP_EVENT) != 0) { 1970 view.mPrivateFlags &= ~PFLAG_CANCEL_NEXT_UP_EVENT; 1971 return true; 1972 } 1973 return false; 1974 } 1975 1976 /** 1977 * Clears all touch targets. 1978 */ 1979 private void clearTouchTargets() { 1980 TouchTarget target = mFirstTouchTarget; 1981 if (target != null) { 1982 do { 1983 TouchTarget next = target.next; 1984 target.recycle(); 1985 target = next; 1986 } while (target != null); 1987 mFirstTouchTarget = null; 1988 } 1989 } 1990 1991 /** 1992 * Cancels and clears all touch targets. 1993 */ 1994 private void cancelAndClearTouchTargets(MotionEvent event) { 1995 if (mFirstTouchTarget != null) { 1996 boolean syntheticEvent = false; 1997 if (event == null) { 1998 final long now = SystemClock.uptimeMillis(); 1999 event = MotionEvent.obtain(now, now, 2000 MotionEvent.ACTION_CANCEL, 0.0f, 0.0f, 0); 2001 event.setSource(InputDevice.SOURCE_TOUCHSCREEN); 2002 syntheticEvent = true; 2003 } 2004 2005 for (TouchTarget target = mFirstTouchTarget; target != null; target = target.next) { 2006 resetCancelNextUpFlag(target.child); 2007 dispatchTransformedTouchEvent(event, true, target.child, target.pointerIdBits); 2008 } 2009 clearTouchTargets(); 2010 2011 if (syntheticEvent) { 2012 event.recycle(); 2013 } 2014 } 2015 } 2016 2017 /** 2018 * Gets the touch target for specified child view. 2019 * Returns null if not found. 2020 */ 2021 private TouchTarget getTouchTarget(View child) { 2022 for (TouchTarget target = mFirstTouchTarget; target != null; target = target.next) { 2023 if (target.child == child) { 2024 return target; 2025 } 2026 } 2027 return null; 2028 } 2029 2030 /** 2031 * Adds a touch target for specified child to the beginning of the list. 2032 * Assumes the target child is not already present. 2033 */ 2034 private TouchTarget addTouchTarget(View child, int pointerIdBits) { 2035 TouchTarget target = TouchTarget.obtain(child, pointerIdBits); 2036 target.next = mFirstTouchTarget; 2037 mFirstTouchTarget = target; 2038 return target; 2039 } 2040 2041 /** 2042 * Removes the pointer ids from consideration. 2043 */ 2044 private void removePointersFromTouchTargets(int pointerIdBits) { 2045 TouchTarget predecessor = null; 2046 TouchTarget target = mFirstTouchTarget; 2047 while (target != null) { 2048 final TouchTarget next = target.next; 2049 if ((target.pointerIdBits & pointerIdBits) != 0) { 2050 target.pointerIdBits &= ~pointerIdBits; 2051 if (target.pointerIdBits == 0) { 2052 if (predecessor == null) { 2053 mFirstTouchTarget = next; 2054 } else { 2055 predecessor.next = next; 2056 } 2057 target.recycle(); 2058 target = next; 2059 continue; 2060 } 2061 } 2062 predecessor = target; 2063 target = next; 2064 } 2065 } 2066 2067 private void cancelTouchTarget(View view) { 2068 TouchTarget predecessor = null; 2069 TouchTarget target = mFirstTouchTarget; 2070 while (target != null) { 2071 final TouchTarget next = target.next; 2072 if (target.child == view) { 2073 if (predecessor == null) { 2074 mFirstTouchTarget = next; 2075 } else { 2076 predecessor.next = next; 2077 } 2078 target.recycle(); 2079 2080 final long now = SystemClock.uptimeMillis(); 2081 MotionEvent event = MotionEvent.obtain(now, now, 2082 MotionEvent.ACTION_CANCEL, 0.0f, 0.0f, 0); 2083 event.setSource(InputDevice.SOURCE_TOUCHSCREEN); 2084 view.dispatchTouchEvent(event); 2085 event.recycle(); 2086 return; 2087 } 2088 predecessor = target; 2089 target = next; 2090 } 2091 } 2092 2093 /** 2094 * Returns true if a child view can receive pointer events. 2095 * @hide 2096 */ 2097 private static boolean canViewReceivePointerEvents(View child) { 2098 return (child.mViewFlags & VISIBILITY_MASK) == VISIBLE 2099 || child.getAnimation() != null; 2100 } 2101 2102 /** 2103 * Returns true if a child view contains the specified point when transformed 2104 * into its coordinate space. 2105 * Child must not be null. 2106 * @hide 2107 */ 2108 protected boolean isTransformedTouchPointInView(float x, float y, View child, 2109 PointF outLocalPoint) { 2110 float localX = x + mScrollX - child.mLeft; 2111 float localY = y + mScrollY - child.mTop; 2112 if (! child.hasIdentityMatrix() && mAttachInfo != null) { 2113 final float[] localXY = mAttachInfo.mTmpTransformLocation; 2114 localXY[0] = localX; 2115 localXY[1] = localY; 2116 child.getInverseMatrix().mapPoints(localXY); 2117 localX = localXY[0]; 2118 localY = localXY[1]; 2119 } 2120 final boolean isInView = child.pointInView(localX, localY); 2121 if (isInView && outLocalPoint != null) { 2122 outLocalPoint.set(localX, localY); 2123 } 2124 return isInView; 2125 } 2126 2127 /** 2128 * Transforms a motion event into the coordinate space of a particular child view, 2129 * filters out irrelevant pointer ids, and overrides its action if necessary. 2130 * If child is null, assumes the MotionEvent will be sent to this ViewGroup instead. 2131 */ 2132 private boolean dispatchTransformedTouchEvent(MotionEvent event, boolean cancel, 2133 View child, int desiredPointerIdBits) { 2134 final boolean handled; 2135 2136 // Canceling motions is a special case. We don't need to perform any transformations 2137 // or filtering. The important part is the action, not the contents. 2138 final int oldAction = event.getAction(); 2139 if (cancel || oldAction == MotionEvent.ACTION_CANCEL) { 2140 event.setAction(MotionEvent.ACTION_CANCEL); 2141 if (child == null) { 2142 handled = super.dispatchTouchEvent(event); 2143 } else { 2144 handled = child.dispatchTouchEvent(event); 2145 } 2146 event.setAction(oldAction); 2147 return handled; 2148 } 2149 2150 // Calculate the number of pointers to deliver. 2151 final int oldPointerIdBits = event.getPointerIdBits(); 2152 final int newPointerIdBits = oldPointerIdBits & desiredPointerIdBits; 2153 2154 // If for some reason we ended up in an inconsistent state where it looks like we 2155 // might produce a motion event with no pointers in it, then drop the event. 2156 if (newPointerIdBits == 0) { 2157 return false; 2158 } 2159 2160 // If the number of pointers is the same and we don't need to perform any fancy 2161 // irreversible transformations, then we can reuse the motion event for this 2162 // dispatch as long as we are careful to revert any changes we make. 2163 // Otherwise we need to make a copy. 2164 final MotionEvent transformedEvent; 2165 if (newPointerIdBits == oldPointerIdBits) { 2166 if (child == null || child.hasIdentityMatrix()) { 2167 if (child == null) { 2168 handled = super.dispatchTouchEvent(event); 2169 } else { 2170 final float offsetX = mScrollX - child.mLeft; 2171 final float offsetY = mScrollY - child.mTop; 2172 event.offsetLocation(offsetX, offsetY); 2173 2174 handled = child.dispatchTouchEvent(event); 2175 2176 event.offsetLocation(-offsetX, -offsetY); 2177 } 2178 return handled; 2179 } 2180 transformedEvent = MotionEvent.obtain(event); 2181 } else { 2182 transformedEvent = event.split(newPointerIdBits); 2183 } 2184 2185 // Perform any necessary transformations and dispatch. 2186 if (child == null) { 2187 handled = super.dispatchTouchEvent(transformedEvent); 2188 } else { 2189 final float offsetX = mScrollX - child.mLeft; 2190 final float offsetY = mScrollY - child.mTop; 2191 transformedEvent.offsetLocation(offsetX, offsetY); 2192 if (! child.hasIdentityMatrix()) { 2193 transformedEvent.transform(child.getInverseMatrix()); 2194 } 2195 2196 handled = child.dispatchTouchEvent(transformedEvent); 2197 } 2198 2199 // Done. 2200 transformedEvent.recycle(); 2201 return handled; 2202 } 2203 2204 /** 2205 * Enable or disable the splitting of MotionEvents to multiple children during touch event 2206 * dispatch. This behavior is enabled by default for applications that target an 2207 * SDK version of {@link Build.VERSION_CODES#HONEYCOMB} or newer. 2208 * 2209 * <p>When this option is enabled MotionEvents may be split and dispatched to different child 2210 * views depending on where each pointer initially went down. This allows for user interactions 2211 * such as scrolling two panes of content independently, chording of buttons, and performing 2212 * independent gestures on different pieces of content. 2213 * 2214 * @param split <code>true</code> to allow MotionEvents to be split and dispatched to multiple 2215 * child views. <code>false</code> to only allow one child view to be the target of 2216 * any MotionEvent received by this ViewGroup. 2217 */ 2218 public void setMotionEventSplittingEnabled(boolean split) { 2219 // TODO Applications really shouldn't change this setting mid-touch event, 2220 // but perhaps this should handle that case and send ACTION_CANCELs to any child views 2221 // with gestures in progress when this is changed. 2222 if (split) { 2223 mGroupFlags |= FLAG_SPLIT_MOTION_EVENTS; 2224 } else { 2225 mGroupFlags &= ~FLAG_SPLIT_MOTION_EVENTS; 2226 } 2227 } 2228 2229 /** 2230 * Returns true if MotionEvents dispatched to this ViewGroup can be split to multiple children. 2231 * @return true if MotionEvents dispatched to this ViewGroup can be split to multiple children. 2232 */ 2233 public boolean isMotionEventSplittingEnabled() { 2234 return (mGroupFlags & FLAG_SPLIT_MOTION_EVENTS) == FLAG_SPLIT_MOTION_EVENTS; 2235 } 2236 2237 /** 2238 * {@inheritDoc} 2239 */ 2240 public void requestDisallowInterceptTouchEvent(boolean disallowIntercept) { 2241 2242 if (disallowIntercept == ((mGroupFlags & FLAG_DISALLOW_INTERCEPT) != 0)) { 2243 // We're already in this state, assume our ancestors are too 2244 return; 2245 } 2246 2247 if (disallowIntercept) { 2248 mGroupFlags |= FLAG_DISALLOW_INTERCEPT; 2249 } else { 2250 mGroupFlags &= ~FLAG_DISALLOW_INTERCEPT; 2251 } 2252 2253 // Pass it up to our parent 2254 if (mParent != null) { 2255 mParent.requestDisallowInterceptTouchEvent(disallowIntercept); 2256 } 2257 } 2258 2259 /** 2260 * Implement this method to intercept all touch screen motion events. This 2261 * allows you to watch events as they are dispatched to your children, and 2262 * take ownership of the current gesture at any point. 2263 * 2264 * <p>Using this function takes some care, as it has a fairly complicated 2265 * interaction with {@link View#onTouchEvent(MotionEvent) 2266 * View.onTouchEvent(MotionEvent)}, and using it requires implementing 2267 * that method as well as this one in the correct way. Events will be 2268 * received in the following order: 2269 * 2270 * <ol> 2271 * <li> You will receive the down event here. 2272 * <li> The down event will be handled either by a child of this view 2273 * group, or given to your own onTouchEvent() method to handle; this means 2274 * you should implement onTouchEvent() to return true, so you will 2275 * continue to see the rest of the gesture (instead of looking for 2276 * a parent view to handle it). Also, by returning true from 2277 * onTouchEvent(), you will not receive any following 2278 * events in onInterceptTouchEvent() and all touch processing must 2279 * happen in onTouchEvent() like normal. 2280 * <li> For as long as you return false from this function, each following 2281 * event (up to and including the final up) will be delivered first here 2282 * and then to the target's onTouchEvent(). 2283 * <li> If you return true from here, you will not receive any 2284 * following events: the target view will receive the same event but 2285 * with the action {@link MotionEvent#ACTION_CANCEL}, and all further 2286 * events will be delivered to your onTouchEvent() method and no longer 2287 * appear here. 2288 * </ol> 2289 * 2290 * @param ev The motion event being dispatched down the hierarchy. 2291 * @return Return true to steal motion events from the children and have 2292 * them dispatched to this ViewGroup through onTouchEvent(). 2293 * The current target will receive an ACTION_CANCEL event, and no further 2294 * messages will be delivered here. 2295 */ 2296 public boolean onInterceptTouchEvent(MotionEvent ev) { 2297 return false; 2298 } 2299 2300 /** 2301 * {@inheritDoc} 2302 * 2303 * Looks for a view to give focus to respecting the setting specified by 2304 * {@link #getDescendantFocusability()}. 2305 * 2306 * Uses {@link #onRequestFocusInDescendants(int, android.graphics.Rect)} to 2307 * find focus within the children of this group when appropriate. 2308 * 2309 * @see #FOCUS_BEFORE_DESCENDANTS 2310 * @see #FOCUS_AFTER_DESCENDANTS 2311 * @see #FOCUS_BLOCK_DESCENDANTS 2312 * @see #onRequestFocusInDescendants(int, android.graphics.Rect) 2313 */ 2314 @Override 2315 public boolean requestFocus(int direction, Rect previouslyFocusedRect) { 2316 if (DBG) { 2317 System.out.println(this + " ViewGroup.requestFocus direction=" 2318 + direction); 2319 } 2320 int descendantFocusability = getDescendantFocusability(); 2321 2322 switch (descendantFocusability) { 2323 case FOCUS_BLOCK_DESCENDANTS: 2324 return super.requestFocus(direction, previouslyFocusedRect); 2325 case FOCUS_BEFORE_DESCENDANTS: { 2326 final boolean took = super.requestFocus(direction, previouslyFocusedRect); 2327 return took ? took : onRequestFocusInDescendants(direction, previouslyFocusedRect); 2328 } 2329 case FOCUS_AFTER_DESCENDANTS: { 2330 final boolean took = onRequestFocusInDescendants(direction, previouslyFocusedRect); 2331 return took ? took : super.requestFocus(direction, previouslyFocusedRect); 2332 } 2333 default: 2334 throw new IllegalStateException("descendant focusability must be " 2335 + "one of FOCUS_BEFORE_DESCENDANTS, FOCUS_AFTER_DESCENDANTS, FOCUS_BLOCK_DESCENDANTS " 2336 + "but is " + descendantFocusability); 2337 } 2338 } 2339 2340 /** 2341 * Look for a descendant to call {@link View#requestFocus} on. 2342 * Called by {@link ViewGroup#requestFocus(int, android.graphics.Rect)} 2343 * when it wants to request focus within its children. Override this to 2344 * customize how your {@link ViewGroup} requests focus within its children. 2345 * @param direction One of FOCUS_UP, FOCUS_DOWN, FOCUS_LEFT, and FOCUS_RIGHT 2346 * @param previouslyFocusedRect The rectangle (in this View's coordinate system) 2347 * to give a finer grained hint about where focus is coming from. May be null 2348 * if there is no hint. 2349 * @return Whether focus was taken. 2350 */ 2351 @SuppressWarnings({"ConstantConditions"}) 2352 protected boolean onRequestFocusInDescendants(int direction, 2353 Rect previouslyFocusedRect) { 2354 int index; 2355 int increment; 2356 int end; 2357 int count = mChildrenCount; 2358 if ((direction & FOCUS_FORWARD) != 0) { 2359 index = 0; 2360 increment = 1; 2361 end = count; 2362 } else { 2363 index = count - 1; 2364 increment = -1; 2365 end = -1; 2366 } 2367 final View[] children = mChildren; 2368 for (int i = index; i != end; i += increment) { 2369 View child = children[i]; 2370 if ((child.mViewFlags & VISIBILITY_MASK) == VISIBLE) { 2371 if (child.requestFocus(direction, previouslyFocusedRect)) { 2372 return true; 2373 } 2374 } 2375 } 2376 return false; 2377 } 2378 2379 /** 2380 * {@inheritDoc} 2381 * 2382 * @hide 2383 */ 2384 @Override 2385 public void dispatchStartTemporaryDetach() { 2386 super.dispatchStartTemporaryDetach(); 2387 final int count = mChildrenCount; 2388 final View[] children = mChildren; 2389 for (int i = 0; i < count; i++) { 2390 children[i].dispatchStartTemporaryDetach(); 2391 } 2392 } 2393 2394 /** 2395 * {@inheritDoc} 2396 * 2397 * @hide 2398 */ 2399 @Override 2400 public void dispatchFinishTemporaryDetach() { 2401 super.dispatchFinishTemporaryDetach(); 2402 final int count = mChildrenCount; 2403 final View[] children = mChildren; 2404 for (int i = 0; i < count; i++) { 2405 children[i].dispatchFinishTemporaryDetach(); 2406 } 2407 } 2408 2409 /** 2410 * {@inheritDoc} 2411 */ 2412 @Override 2413 void dispatchAttachedToWindow(AttachInfo info, int visibility) { 2414 mGroupFlags |= FLAG_PREVENT_DISPATCH_ATTACHED_TO_WINDOW; 2415 super.dispatchAttachedToWindow(info, visibility); 2416 mGroupFlags &= ~FLAG_PREVENT_DISPATCH_ATTACHED_TO_WINDOW; 2417 2418 final int count = mChildrenCount; 2419 final View[] children = mChildren; 2420 for (int i = 0; i < count; i++) { 2421 final View child = children[i]; 2422 child.dispatchAttachedToWindow(info, 2423 visibility | (child.mViewFlags&VISIBILITY_MASK)); 2424 } 2425 } 2426 2427 @Override 2428 void dispatchScreenStateChanged(int screenState) { 2429 super.dispatchScreenStateChanged(screenState); 2430 2431 final int count = mChildrenCount; 2432 final View[] children = mChildren; 2433 for (int i = 0; i < count; i++) { 2434 children[i].dispatchScreenStateChanged(screenState); 2435 } 2436 } 2437 2438 @Override 2439 boolean dispatchPopulateAccessibilityEventInternal(AccessibilityEvent event) { 2440 boolean handled = false; 2441 if (includeForAccessibility()) { 2442 handled = super.dispatchPopulateAccessibilityEventInternal(event); 2443 if (handled) { 2444 return handled; 2445 } 2446 } 2447 // Let our children have a shot in populating the event. 2448 ChildListForAccessibility children = ChildListForAccessibility.obtain(this, true); 2449 try { 2450 final int childCount = children.getChildCount(); 2451 for (int i = 0; i < childCount; i++) { 2452 View child = children.getChildAt(i); 2453 if ((child.mViewFlags & VISIBILITY_MASK) == VISIBLE) { 2454 handled = child.dispatchPopulateAccessibilityEvent(event); 2455 if (handled) { 2456 return handled; 2457 } 2458 } 2459 } 2460 } finally { 2461 children.recycle(); 2462 } 2463 return false; 2464 } 2465 2466 @Override 2467 void onInitializeAccessibilityNodeInfoInternal(AccessibilityNodeInfo info) { 2468 super.onInitializeAccessibilityNodeInfoInternal(info); 2469 if (mAttachInfo != null) { 2470 ArrayList<View> childrenForAccessibility = mAttachInfo.mTempArrayList; 2471 childrenForAccessibility.clear(); 2472 addChildrenForAccessibility(childrenForAccessibility); 2473 final int childrenForAccessibilityCount = childrenForAccessibility.size(); 2474 for (int i = 0; i < childrenForAccessibilityCount; i++) { 2475 View child = childrenForAccessibility.get(i); 2476 info.addChild(child); 2477 } 2478 childrenForAccessibility.clear(); 2479 } 2480 } 2481 2482 @Override 2483 void onInitializeAccessibilityEventInternal(AccessibilityEvent event) { 2484 super.onInitializeAccessibilityEventInternal(event); 2485 event.setClassName(ViewGroup.class.getName()); 2486 } 2487 2488 /** 2489 * @hide 2490 */ 2491 @Override 2492 public void resetAccessibilityStateChanged() { 2493 super.resetAccessibilityStateChanged(); 2494 View[] children = mChildren; 2495 final int childCount = mChildrenCount; 2496 for (int i = 0; i < childCount; i++) { 2497 View child = children[i]; 2498 child.resetAccessibilityStateChanged(); 2499 } 2500 } 2501 2502 /** 2503 * {@inheritDoc} 2504 */ 2505 @Override 2506 void dispatchDetachedFromWindow() { 2507 // If we still have a touch target, we are still in the process of 2508 // dispatching motion events to a child; we need to get rid of that 2509 // child to avoid dispatching events to it after the window is torn 2510 // down. To make sure we keep the child in a consistent state, we 2511 // first send it an ACTION_CANCEL motion event. 2512 cancelAndClearTouchTargets(null); 2513 2514 // Similarly, set ACTION_EXIT to all hover targets and clear them. 2515 exitHoverTargets(); 2516 2517 // In case view is detached while transition is running 2518 mLayoutSuppressed = false; 2519 2520 // Tear down our drag tracking 2521 mDragNotifiedChildren = null; 2522 if (mCurrentDrag != null) { 2523 mCurrentDrag.recycle(); 2524 mCurrentDrag = null; 2525 } 2526 2527 final int count = mChildrenCount; 2528 final View[] children = mChildren; 2529 for (int i = 0; i < count; i++) { 2530 children[i].dispatchDetachedFromWindow(); 2531 } 2532 super.dispatchDetachedFromWindow(); 2533 } 2534 2535 /** 2536 * @hide 2537 */ 2538 @Override 2539 protected void internalSetPadding(int left, int top, int right, int bottom) { 2540 super.internalSetPadding(left, top, right, bottom); 2541 2542 if ((mPaddingLeft | mPaddingTop | mPaddingRight | mPaddingBottom) != 0) { 2543 mGroupFlags |= FLAG_PADDING_NOT_NULL; 2544 } else { 2545 mGroupFlags &= ~FLAG_PADDING_NOT_NULL; 2546 } 2547 } 2548 2549 /** 2550 * {@inheritDoc} 2551 */ 2552 @Override 2553 protected void dispatchSaveInstanceState(SparseArray<Parcelable> container) { 2554 super.dispatchSaveInstanceState(container); 2555 final int count = mChildrenCount; 2556 final View[] children = mChildren; 2557 for (int i = 0; i < count; i++) { 2558 View c = children[i]; 2559 if ((c.mViewFlags & PARENT_SAVE_DISABLED_MASK) != PARENT_SAVE_DISABLED) { 2560 c.dispatchSaveInstanceState(container); 2561 } 2562 } 2563 } 2564 2565 /** 2566 * Perform dispatching of a {@link #saveHierarchyState(android.util.SparseArray)} freeze()} 2567 * to only this view, not to its children. For use when overriding 2568 * {@link #dispatchSaveInstanceState(android.util.SparseArray)} dispatchFreeze()} to allow 2569 * subclasses to freeze their own state but not the state of their children. 2570 * 2571 * @param container the container 2572 */ 2573 protected void dispatchFreezeSelfOnly(SparseArray<Parcelable> container) { 2574 super.dispatchSaveInstanceState(container); 2575 } 2576 2577 /** 2578 * {@inheritDoc} 2579 */ 2580 @Override 2581 protected void dispatchRestoreInstanceState(SparseArray<Parcelable> container) { 2582 super.dispatchRestoreInstanceState(container); 2583 final int count = mChildrenCount; 2584 final View[] children = mChildren; 2585 for (int i = 0; i < count; i++) { 2586 View c = children[i]; 2587 if ((c.mViewFlags & PARENT_SAVE_DISABLED_MASK) != PARENT_SAVE_DISABLED) { 2588 c.dispatchRestoreInstanceState(container); 2589 } 2590 } 2591 } 2592 2593 /** 2594 * Perform dispatching of a {@link #restoreHierarchyState(android.util.SparseArray)} 2595 * to only this view, not to its children. For use when overriding 2596 * {@link #dispatchRestoreInstanceState(android.util.SparseArray)} to allow 2597 * subclasses to thaw their own state but not the state of their children. 2598 * 2599 * @param container the container 2600 */ 2601 protected void dispatchThawSelfOnly(SparseArray<Parcelable> container) { 2602 super.dispatchRestoreInstanceState(container); 2603 } 2604 2605 /** 2606 * Enables or disables the drawing cache for each child of this view group. 2607 * 2608 * @param enabled true to enable the cache, false to dispose of it 2609 */ 2610 protected void setChildrenDrawingCacheEnabled(boolean enabled) { 2611 if (enabled || (mPersistentDrawingCache & PERSISTENT_ALL_CACHES) != PERSISTENT_ALL_CACHES) { 2612 final View[] children = mChildren; 2613 final int count = mChildrenCount; 2614 for (int i = 0; i < count; i++) { 2615 children[i].setDrawingCacheEnabled(enabled); 2616 } 2617 } 2618 } 2619 2620 @Override 2621 protected void onAnimationStart() { 2622 super.onAnimationStart(); 2623 2624 // When this ViewGroup's animation starts, build the cache for the children 2625 if ((mGroupFlags & FLAG_ANIMATION_CACHE) == FLAG_ANIMATION_CACHE) { 2626 final int count = mChildrenCount; 2627 final View[] children = mChildren; 2628 final boolean buildCache = !isHardwareAccelerated(); 2629 2630 for (int i = 0; i < count; i++) { 2631 final View child = children[i]; 2632 if ((child.mViewFlags & VISIBILITY_MASK) == VISIBLE) { 2633 child.setDrawingCacheEnabled(true); 2634 if (buildCache) { 2635 child.buildDrawingCache(true); 2636 } 2637 } 2638 } 2639 2640 mGroupFlags |= FLAG_CHILDREN_DRAWN_WITH_CACHE; 2641 } 2642 } 2643 2644 @Override 2645 protected void onAnimationEnd() { 2646 super.onAnimationEnd(); 2647 2648 // When this ViewGroup's animation ends, destroy the cache of the children 2649 if ((mGroupFlags & FLAG_ANIMATION_CACHE) == FLAG_ANIMATION_CACHE) { 2650 mGroupFlags &= ~FLAG_CHILDREN_DRAWN_WITH_CACHE; 2651 2652 if ((mPersistentDrawingCache & PERSISTENT_ANIMATION_CACHE) == 0) { 2653 setChildrenDrawingCacheEnabled(false); 2654 } 2655 } 2656 } 2657 2658 @Override 2659 Bitmap createSnapshot(Bitmap.Config quality, int backgroundColor, boolean skipChildren) { 2660 int count = mChildrenCount; 2661 int[] visibilities = null; 2662 2663 if (skipChildren) { 2664 visibilities = new int[count]; 2665 for (int i = 0; i < count; i++) { 2666 View child = getChildAt(i); 2667 visibilities[i] = child.getVisibility(); 2668 if (visibilities[i] == View.VISIBLE) { 2669 child.setVisibility(INVISIBLE); 2670 } 2671 } 2672 } 2673 2674 Bitmap b = super.createSnapshot(quality, backgroundColor, skipChildren); 2675 2676 if (skipChildren) { 2677 for (int i = 0; i < count; i++) { 2678 getChildAt(i).setVisibility(visibilities[i]); 2679 } 2680 } 2681 2682 return b; 2683 } 2684 2685 private static void drawRect(Canvas canvas, int x1, int y1, int x2, int y2, int color) { 2686 Paint paint = getDebugPaint(); 2687 paint.setColor(color); 2688 2689 canvas.drawLines(getDebugLines(x1, y1, x2, y2), paint); 2690 } 2691 2692 /** 2693 * @hide 2694 */ 2695 protected void onDebugDrawMargins(Canvas canvas) { 2696 for (int i = 0; i < getChildCount(); i++) { 2697 View c = getChildAt(i); 2698 c.getLayoutParams().onDebugDraw(c, canvas); 2699 } 2700 } 2701 2702 /** 2703 * @hide 2704 */ 2705 protected void onDebugDraw(Canvas canvas) { 2706 // Draw optical bounds 2707 if (getLayoutMode() == OPTICAL_BOUNDS) { 2708 for (int i = 0; i < getChildCount(); i++) { 2709 View c = getChildAt(i); 2710 Insets insets = c.getOpticalInsets(); 2711 drawRect(canvas, 2712 c.getLeft() + insets.left, 2713 c.getTop() + insets.top, 2714 c.getRight() - insets.right, 2715 c.getBottom() - insets.bottom, Color.RED); 2716 } 2717 } 2718 2719 // Draw margins 2720 onDebugDrawMargins(canvas); 2721 2722 // Draw bounds 2723 for (int i = 0; i < getChildCount(); i++) { 2724 View c = getChildAt(i); 2725 drawRect(canvas, c.getLeft(), c.getTop(), c.getRight(), c.getBottom(), Color.BLUE); 2726 } 2727 } 2728 2729 /** 2730 * {@inheritDoc} 2731 */ 2732 @Override 2733 protected void dispatchDraw(Canvas canvas) { 2734 final int count = mChildrenCount; 2735 final View[] children = mChildren; 2736 int flags = mGroupFlags; 2737 2738 if ((flags & FLAG_RUN_ANIMATION) != 0 && canAnimate()) { 2739 final boolean cache = (mGroupFlags & FLAG_ANIMATION_CACHE) == FLAG_ANIMATION_CACHE; 2740 2741 final boolean buildCache = !isHardwareAccelerated(); 2742 for (int i = 0; i < count; i++) { 2743 final View child = children[i]; 2744 if ((child.mViewFlags & VISIBILITY_MASK) == VISIBLE) { 2745 final LayoutParams params = child.getLayoutParams(); 2746 attachLayoutAnimationParameters(child, params, i, count); 2747 bindLayoutAnimation(child); 2748 if (cache) { 2749 child.setDrawingCacheEnabled(true); 2750 if (buildCache) { 2751 child.buildDrawingCache(true); 2752 } 2753 } 2754 } 2755 } 2756 2757 final LayoutAnimationController controller = mLayoutAnimationController; 2758 if (controller.willOverlap()) { 2759 mGroupFlags |= FLAG_OPTIMIZE_INVALIDATE; 2760 } 2761 2762 controller.start(); 2763 2764 mGroupFlags &= ~FLAG_RUN_ANIMATION; 2765 mGroupFlags &= ~FLAG_ANIMATION_DONE; 2766 2767 if (cache) { 2768 mGroupFlags |= FLAG_CHILDREN_DRAWN_WITH_CACHE; 2769 } 2770 2771 if (mAnimationListener != null) { 2772 mAnimationListener.onAnimationStart(controller.getAnimation()); 2773 } 2774 } 2775 2776 int saveCount = 0; 2777 final boolean clipToPadding = (flags & CLIP_TO_PADDING_MASK) == CLIP_TO_PADDING_MASK; 2778 if (clipToPadding) { 2779 saveCount = canvas.save(); 2780 canvas.clipRect(mScrollX + mPaddingLeft, mScrollY + mPaddingTop, 2781 mScrollX + mRight - mLeft - mPaddingRight, 2782 mScrollY + mBottom - mTop - mPaddingBottom); 2783 2784 } 2785 2786 // We will draw our child's animation, let's reset the flag 2787 mPrivateFlags &= ~PFLAG_DRAW_ANIMATION; 2788 mGroupFlags &= ~FLAG_INVALIDATE_REQUIRED; 2789 2790 boolean more = false; 2791 final long drawingTime = getDrawingTime(); 2792 2793 if ((flags & FLAG_USE_CHILD_DRAWING_ORDER) == 0) { 2794 for (int i = 0; i < count; i++) { 2795 final View child = children[i]; 2796 if ((child.mViewFlags & VISIBILITY_MASK) == VISIBLE || child.getAnimation() != null) { 2797 more |= drawChild(canvas, child, drawingTime); 2798 } 2799 } 2800 } else { 2801 for (int i = 0; i < count; i++) { 2802 final View child = children[getChildDrawingOrder(count, i)]; 2803 if ((child.mViewFlags & VISIBILITY_MASK) == VISIBLE || child.getAnimation() != null) { 2804 more |= drawChild(canvas, child, drawingTime); 2805 } 2806 } 2807 } 2808 2809 // Draw any disappearing views that have animations 2810 if (mDisappearingChildren != null) { 2811 final ArrayList<View> disappearingChildren = mDisappearingChildren; 2812 final int disappearingCount = disappearingChildren.size() - 1; 2813 // Go backwards -- we may delete as animations finish 2814 for (int i = disappearingCount; i >= 0; i--) { 2815 final View child = disappearingChildren.get(i); 2816 more |= drawChild(canvas, child, drawingTime); 2817 } 2818 } 2819 2820 if (debugDraw()) { 2821 onDebugDraw(canvas); 2822 } 2823 2824 if (clipToPadding) { 2825 canvas.restoreToCount(saveCount); 2826 } 2827 2828 // mGroupFlags might have been updated by drawChild() 2829 flags = mGroupFlags; 2830 2831 if ((flags & FLAG_INVALIDATE_REQUIRED) == FLAG_INVALIDATE_REQUIRED) { 2832 invalidate(true); 2833 } 2834 2835 if ((flags & FLAG_ANIMATION_DONE) == 0 && (flags & FLAG_NOTIFY_ANIMATION_LISTENER) == 0 && 2836 mLayoutAnimationController.isDone() && !more) { 2837 // We want to erase the drawing cache and notify the listener after the 2838 // next frame is drawn because one extra invalidate() is caused by 2839 // drawChild() after the animation is over 2840 mGroupFlags |= FLAG_NOTIFY_ANIMATION_LISTENER; 2841 final Runnable end = new Runnable() { 2842 public void run() { 2843 notifyAnimationListener(); 2844 } 2845 }; 2846 post(end); 2847 } 2848 } 2849 2850 /** 2851 * Returns the index of the child to draw for this iteration. Override this 2852 * if you want to change the drawing order of children. By default, it 2853 * returns i. 2854 * <p> 2855 * NOTE: In order for this method to be called, you must enable child ordering 2856 * first by calling {@link #setChildrenDrawingOrderEnabled(boolean)}. 2857 * 2858 * @param i The current iteration. 2859 * @return The index of the child to draw this iteration. 2860 * 2861 * @see #setChildrenDrawingOrderEnabled(boolean) 2862 * @see #isChildrenDrawingOrderEnabled() 2863 */ 2864 protected int getChildDrawingOrder(int childCount, int i) { 2865 return i; 2866 } 2867 2868 private void notifyAnimationListener() { 2869 mGroupFlags &= ~FLAG_NOTIFY_ANIMATION_LISTENER; 2870 mGroupFlags |= FLAG_ANIMATION_DONE; 2871 2872 if (mAnimationListener != null) { 2873 final Runnable end = new Runnable() { 2874 public void run() { 2875 mAnimationListener.onAnimationEnd(mLayoutAnimationController.getAnimation()); 2876 } 2877 }; 2878 post(end); 2879 } 2880 2881 if ((mGroupFlags & FLAG_ANIMATION_CACHE) == FLAG_ANIMATION_CACHE) { 2882 mGroupFlags &= ~FLAG_CHILDREN_DRAWN_WITH_CACHE; 2883 if ((mPersistentDrawingCache & PERSISTENT_ANIMATION_CACHE) == 0) { 2884 setChildrenDrawingCacheEnabled(false); 2885 } 2886 } 2887 2888 invalidate(true); 2889 } 2890 2891 /** 2892 * This method is used to cause children of this ViewGroup to restore or recreate their 2893 * display lists. It is called by getDisplayList() when the parent ViewGroup does not need 2894 * to recreate its own display list, which would happen if it went through the normal 2895 * draw/dispatchDraw mechanisms. 2896 * 2897 * @hide 2898 */ 2899 @Override 2900 protected void dispatchGetDisplayList() { 2901 final int count = mChildrenCount; 2902 final View[] children = mChildren; 2903 for (int i = 0; i < count; i++) { 2904 final View child = children[i]; 2905 if (((child.mViewFlags & VISIBILITY_MASK) == VISIBLE || child.getAnimation() != null) && 2906 child.hasStaticLayer()) { 2907 child.mRecreateDisplayList = (child.mPrivateFlags & PFLAG_INVALIDATED) 2908 == PFLAG_INVALIDATED; 2909 child.mPrivateFlags &= ~PFLAG_INVALIDATED; 2910 child.getDisplayList(); 2911 child.mRecreateDisplayList = false; 2912 } 2913 } 2914 } 2915 2916 /** 2917 * Draw one child of this View Group. This method is responsible for getting 2918 * the canvas in the right state. This includes clipping, translating so 2919 * that the child's scrolled origin is at 0, 0, and applying any animation 2920 * transformations. 2921 * 2922 * @param canvas The canvas on which to draw the child 2923 * @param child Who to draw 2924 * @param drawingTime The time at which draw is occurring 2925 * @return True if an invalidate() was issued 2926 */ 2927 protected boolean drawChild(Canvas canvas, View child, long drawingTime) { 2928 return child.draw(canvas, this, drawingTime); 2929 } 2930 2931 /** 2932 * By default, children are clipped to their bounds before drawing. This 2933 * allows view groups to override this behavior for animations, etc. 2934 * 2935 * @param clipChildren true to clip children to their bounds, 2936 * false otherwise 2937 * @attr ref android.R.styleable#ViewGroup_clipChildren 2938 */ 2939 public void setClipChildren(boolean clipChildren) { 2940 boolean previousValue = (mGroupFlags & FLAG_CLIP_CHILDREN) == FLAG_CLIP_CHILDREN; 2941 if (clipChildren != previousValue) { 2942 setBooleanFlag(FLAG_CLIP_CHILDREN, clipChildren); 2943 for (int i = 0; i < mChildrenCount; ++i) { 2944 View child = getChildAt(i); 2945 if (child.mDisplayList != null) { 2946 child.mDisplayList.setClipChildren(clipChildren); 2947 } 2948 } 2949 } 2950 } 2951 2952 /** 2953 * By default, children are clipped to the padding of the ViewGroup. This 2954 * allows view groups to override this behavior 2955 * 2956 * @param clipToPadding true to clip children to the padding of the 2957 * group, false otherwise 2958 * @attr ref android.R.styleable#ViewGroup_clipToPadding 2959 */ 2960 public void setClipToPadding(boolean clipToPadding) { 2961 setBooleanFlag(FLAG_CLIP_TO_PADDING, clipToPadding); 2962 } 2963 2964 /** 2965 * {@inheritDoc} 2966 */ 2967 @Override 2968 public void dispatchSetSelected(boolean selected) { 2969 final View[] children = mChildren; 2970 final int count = mChildrenCount; 2971 for (int i = 0; i < count; i++) { 2972 children[i].setSelected(selected); 2973 } 2974 } 2975 2976 /** 2977 * {@inheritDoc} 2978 */ 2979 @Override 2980 public void dispatchSetActivated(boolean activated) { 2981 final View[] children = mChildren; 2982 final int count = mChildrenCount; 2983 for (int i = 0; i < count; i++) { 2984 children[i].setActivated(activated); 2985 } 2986 } 2987 2988 @Override 2989 protected void dispatchSetPressed(boolean pressed) { 2990 final View[] children = mChildren; 2991 final int count = mChildrenCount; 2992 for (int i = 0; i < count; i++) { 2993 final View child = children[i]; 2994 // Children that are clickable on their own should not 2995 // show a pressed state when their parent view does. 2996 // Clearing a pressed state always propagates. 2997 if (!pressed || (!child.isClickable() && !child.isLongClickable())) { 2998 child.setPressed(pressed); 2999 } 3000 } 3001 } 3002 3003 /** 3004 * When this property is set to true, this ViewGroup supports static transformations on 3005 * children; this causes 3006 * {@link #getChildStaticTransformation(View, android.view.animation.Transformation)} to be 3007 * invoked when a child is drawn. 3008 * 3009 * Any subclass overriding 3010 * {@link #getChildStaticTransformation(View, android.view.animation.Transformation)} should 3011 * set this property to true. 3012 * 3013 * @param enabled True to enable static transformations on children, false otherwise. 3014 * 3015 * @see #getChildStaticTransformation(View, android.view.animation.Transformation) 3016 */ 3017 protected void setStaticTransformationsEnabled(boolean enabled) { 3018 setBooleanFlag(FLAG_SUPPORT_STATIC_TRANSFORMATIONS, enabled); 3019 } 3020 3021 /** 3022 * Sets <code>t</code> to be the static transformation of the child, if set, returning a 3023 * boolean to indicate whether a static transform was set. The default implementation 3024 * simply returns <code>false</code>; subclasses may override this method for different 3025 * behavior. {@link #setStaticTransformationsEnabled(boolean)} must be set to true 3026 * for this method to be called. 3027 * 3028 * @param child The child view whose static transform is being requested 3029 * @param t The Transformation which will hold the result 3030 * @return true if the transformation was set, false otherwise 3031 * @see #setStaticTransformationsEnabled(boolean) 3032 */ 3033 protected boolean getChildStaticTransformation(View child, Transformation t) { 3034 return false; 3035 } 3036 3037 /** 3038 * {@hide} 3039 */ 3040 @Override 3041 protected View findViewTraversal(int id) { 3042 if (id == mID) { 3043 return this; 3044 } 3045 3046 final View[] where = mChildren; 3047 final int len = mChildrenCount; 3048 3049 for (int i = 0; i < len; i++) { 3050 View v = where[i]; 3051 3052 if ((v.mPrivateFlags & PFLAG_IS_ROOT_NAMESPACE) == 0) { 3053 v = v.findViewById(id); 3054 3055 if (v != null) { 3056 return v; 3057 } 3058 } 3059 } 3060 3061 return null; 3062 } 3063 3064 /** 3065 * {@hide} 3066 */ 3067 @Override 3068 protected View findViewWithTagTraversal(Object tag) { 3069 if (tag != null && tag.equals(mTag)) { 3070 return this; 3071 } 3072 3073 final View[] where = mChildren; 3074 final int len = mChildrenCount; 3075 3076 for (int i = 0; i < len; i++) { 3077 View v = where[i]; 3078 3079 if ((v.mPrivateFlags & PFLAG_IS_ROOT_NAMESPACE) == 0) { 3080 v = v.findViewWithTag(tag); 3081 3082 if (v != null) { 3083 return v; 3084 } 3085 } 3086 } 3087 3088 return null; 3089 } 3090 3091 /** 3092 * {@hide} 3093 */ 3094 @Override 3095 protected View findViewByPredicateTraversal(Predicate<View> predicate, View childToSkip) { 3096 if (predicate.apply(this)) { 3097 return this; 3098 } 3099 3100 final View[] where = mChildren; 3101 final int len = mChildrenCount; 3102 3103 for (int i = 0; i < len; i++) { 3104 View v = where[i]; 3105 3106 if (v != childToSkip && (v.mPrivateFlags & PFLAG_IS_ROOT_NAMESPACE) == 0) { 3107 v = v.findViewByPredicate(predicate); 3108 3109 if (v != null) { 3110 return v; 3111 } 3112 } 3113 } 3114 3115 return null; 3116 } 3117 3118 /** 3119 * <p>Adds a child view. If no layout parameters are already set on the child, the 3120 * default parameters for this ViewGroup are set on the child.</p> 3121 * 3122 * <p><strong>Note:</strong> do not invoke this method from 3123 * {@link #draw(android.graphics.Canvas)}, {@link #onDraw(android.graphics.Canvas)}, 3124 * {@link #dispatchDraw(android.graphics.Canvas)} or any related method.</p> 3125 * 3126 * @param child the child view to add 3127 * 3128 * @see #generateDefaultLayoutParams() 3129 */ 3130 public void addView(View child) { 3131 addView(child, -1); 3132 } 3133 3134 /** 3135 * Adds a child view. If no layout parameters are already set on the child, the 3136 * default parameters for this ViewGroup are set on the child. 3137 * 3138 * <p><strong>Note:</strong> do not invoke this method from 3139 * {@link #draw(android.graphics.Canvas)}, {@link #onDraw(android.graphics.Canvas)}, 3140 * {@link #dispatchDraw(android.graphics.Canvas)} or any related method.</p> 3141 * 3142 * @param child the child view to add 3143 * @param index the position at which to add the child 3144 * 3145 * @see #generateDefaultLayoutParams() 3146 */ 3147 public void addView(View child, int index) { 3148 LayoutParams params = child.getLayoutParams(); 3149 if (params == null) { 3150 params = generateDefaultLayoutParams(); 3151 if (params == null) { 3152 throw new IllegalArgumentException("generateDefaultLayoutParams() cannot return null"); 3153 } 3154 } 3155 addView(child, index, params); 3156 } 3157 3158 /** 3159 * Adds a child view with this ViewGroup's default layout parameters and the 3160 * specified width and height. 3161 * 3162 * <p><strong>Note:</strong> do not invoke this method from 3163 * {@link #draw(android.graphics.Canvas)}, {@link #onDraw(android.graphics.Canvas)}, 3164 * {@link #dispatchDraw(android.graphics.Canvas)} or any related method.</p> 3165 * 3166 * @param child the child view to add 3167 */ 3168 public void addView(View child, int width, int height) { 3169 final LayoutParams params = generateDefaultLayoutParams(); 3170 params.width = width; 3171 params.height = height; 3172 addView(child, -1, params); 3173 } 3174 3175 /** 3176 * Adds a child view with the specified layout parameters. 3177 * 3178 * <p><strong>Note:</strong> do not invoke this method from 3179 * {@link #draw(android.graphics.Canvas)}, {@link #onDraw(android.graphics.Canvas)}, 3180 * {@link #dispatchDraw(android.graphics.Canvas)} or any related method.</p> 3181 * 3182 * @param child the child view to add 3183 * @param params the layout parameters to set on the child 3184 */ 3185 public void addView(View child, LayoutParams params) { 3186 addView(child, -1, params); 3187 } 3188 3189 /** 3190 * Adds a child view with the specified layout parameters. 3191 * 3192 * <p><strong>Note:</strong> do not invoke this method from 3193 * {@link #draw(android.graphics.Canvas)}, {@link #onDraw(android.graphics.Canvas)}, 3194 * {@link #dispatchDraw(android.graphics.Canvas)} or any related method.</p> 3195 * 3196 * @param child the child view to add 3197 * @param index the position at which to add the child 3198 * @param params the layout parameters to set on the child 3199 */ 3200 public void addView(View child, int index, LayoutParams params) { 3201 if (DBG) { 3202 System.out.println(this + " addView"); 3203 } 3204 3205 // addViewInner() will call child.requestLayout() when setting the new LayoutParams 3206 // therefore, we call requestLayout() on ourselves before, so that the child's request 3207 // will be blocked at our level 3208 requestLayout(); 3209 invalidate(true); 3210 addViewInner(child, index, params, false); 3211 } 3212 3213 /** 3214 * {@inheritDoc} 3215 */ 3216 public void updateViewLayout(View view, ViewGroup.LayoutParams params) { 3217 if (!checkLayoutParams(params)) { 3218 throw new IllegalArgumentException("Invalid LayoutParams supplied to " + this); 3219 } 3220 if (view.mParent != this) { 3221 throw new IllegalArgumentException("Given view not a child of " + this); 3222 } 3223 view.setLayoutParams(params); 3224 } 3225 3226 /** 3227 * {@inheritDoc} 3228 */ 3229 protected boolean checkLayoutParams(ViewGroup.LayoutParams p) { 3230 return p != null; 3231 } 3232 3233 /** 3234 * Interface definition for a callback to be invoked when the hierarchy 3235 * within this view changed. The hierarchy changes whenever a child is added 3236 * to or removed from this view. 3237 */ 3238 public interface OnHierarchyChangeListener { 3239 /** 3240 * Called when a new child is added to a parent view. 3241 * 3242 * @param parent the view in which a child was added 3243 * @param child the new child view added in the hierarchy 3244 */ 3245 void onChildViewAdded(View parent, View child); 3246 3247 /** 3248 * Called when a child is removed from a parent view. 3249 * 3250 * @param parent the view from which the child was removed 3251 * @param child the child removed from the hierarchy 3252 */ 3253 void onChildViewRemoved(View parent, View child); 3254 } 3255 3256 /** 3257 * Register a callback to be invoked when a child is added to or removed 3258 * from this view. 3259 * 3260 * @param listener the callback to invoke on hierarchy change 3261 */ 3262 public void setOnHierarchyChangeListener(OnHierarchyChangeListener listener) { 3263 mOnHierarchyChangeListener = listener; 3264 } 3265 3266 /** 3267 * @hide 3268 */ 3269 protected void onViewAdded(View child) { 3270 if (mOnHierarchyChangeListener != null) { 3271 mOnHierarchyChangeListener.onChildViewAdded(this, child); 3272 } 3273 } 3274 3275 /** 3276 * @hide 3277 */ 3278 protected void onViewRemoved(View child) { 3279 if (mOnHierarchyChangeListener != null) { 3280 mOnHierarchyChangeListener.onChildViewRemoved(this, child); 3281 } 3282 } 3283 3284 /** 3285 * Adds a view during layout. This is useful if in your onLayout() method, 3286 * you need to add more views (as does the list view for example). 3287 * 3288 * If index is negative, it means put it at the end of the list. 3289 * 3290 * @param child the view to add to the group 3291 * @param index the index at which the child must be added 3292 * @param params the layout parameters to associate with the child 3293 * @return true if the child was added, false otherwise 3294 */ 3295 protected boolean addViewInLayout(View child, int index, LayoutParams params) { 3296 return addViewInLayout(child, index, params, false); 3297 } 3298 3299 /** 3300 * Adds a view during layout. This is useful if in your onLayout() method, 3301 * you need to add more views (as does the list view for example). 3302 * 3303 * If index is negative, it means put it at the end of the list. 3304 * 3305 * @param child the view to add to the group 3306 * @param index the index at which the child must be added 3307 * @param params the layout parameters to associate with the child 3308 * @param preventRequestLayout if true, calling this method will not trigger a 3309 * layout request on child 3310 * @return true if the child was added, false otherwise 3311 */ 3312 protected boolean addViewInLayout(View child, int index, LayoutParams params, 3313 boolean preventRequestLayout) { 3314 child.mParent = null; 3315 addViewInner(child, index, params, preventRequestLayout); 3316 child.mPrivateFlags = (child.mPrivateFlags & ~PFLAG_DIRTY_MASK) | PFLAG_DRAWN; 3317 return true; 3318 } 3319 3320 /** 3321 * Prevents the specified child to be laid out during the next layout pass. 3322 * 3323 * @param child the child on which to perform the cleanup 3324 */ 3325 protected void cleanupLayoutState(View child) { 3326 child.mPrivateFlags &= ~View.PFLAG_FORCE_LAYOUT; 3327 } 3328 3329 private void addViewInner(View child, int index, LayoutParams params, 3330 boolean preventRequestLayout) { 3331 3332 if (mTransition != null) { 3333 // Don't prevent other add transitions from completing, but cancel remove 3334 // transitions to let them complete the process before we add to the container 3335 mTransition.cancel(LayoutTransition.DISAPPEARING); 3336 } 3337 3338 if (child.getParent() != null) { 3339 throw new IllegalStateException("The specified child already has a parent. " + 3340 "You must call removeView() on the child's parent first."); 3341 } 3342 3343 if (mTransition != null) { 3344 mTransition.addChild(this, child); 3345 } 3346 3347 if (!checkLayoutParams(params)) { 3348 params = generateLayoutParams(params); 3349 } 3350 3351 if (preventRequestLayout) { 3352 child.mLayoutParams = params; 3353 } else { 3354 child.setLayoutParams(params); 3355 } 3356 3357 if (index < 0) { 3358 index = mChildrenCount; 3359 } 3360 3361 addInArray(child, index); 3362 3363 // tell our children 3364 if (preventRequestLayout) { 3365 child.assignParent(this); 3366 } else { 3367 child.mParent = this; 3368 } 3369 3370 if (child.hasFocus()) { 3371 requestChildFocus(child, child.findFocus()); 3372 } 3373 3374 AttachInfo ai = mAttachInfo; 3375 if (ai != null && (mGroupFlags & FLAG_PREVENT_DISPATCH_ATTACHED_TO_WINDOW) == 0) { 3376 boolean lastKeepOn = ai.mKeepScreenOn; 3377 ai.mKeepScreenOn = false; 3378 child.dispatchAttachedToWindow(mAttachInfo, (mViewFlags&VISIBILITY_MASK)); 3379 if (ai.mKeepScreenOn) { 3380 needGlobalAttributesUpdate(true); 3381 } 3382 ai.mKeepScreenOn = lastKeepOn; 3383 } 3384 3385 if (child.isLayoutDirectionInherited()) { 3386 child.resetResolvedLayoutDirection(); 3387 child.resolveRtlPropertiesIfNeeded(); 3388 } 3389 3390 onViewAdded(child); 3391 3392 if ((child.mViewFlags & DUPLICATE_PARENT_STATE) == DUPLICATE_PARENT_STATE) { 3393 mGroupFlags |= FLAG_NOTIFY_CHILDREN_ON_DRAWABLE_STATE_CHANGE; 3394 } 3395 3396 if (child.hasTransientState()) { 3397 childHasTransientStateChanged(child, true); 3398 } 3399 } 3400 3401 private void addInArray(View child, int index) { 3402 View[] children = mChildren; 3403 final int count = mChildrenCount; 3404 final int size = children.length; 3405 if (index == count) { 3406 if (size == count) { 3407 mChildren = new View[size + ARRAY_CAPACITY_INCREMENT]; 3408 System.arraycopy(children, 0, mChildren, 0, size); 3409 children = mChildren; 3410 } 3411 children[mChildrenCount++] = child; 3412 } else if (index < count) { 3413 if (size == count) { 3414 mChildren = new View[size + ARRAY_CAPACITY_INCREMENT]; 3415 System.arraycopy(children, 0, mChildren, 0, index); 3416 System.arraycopy(children, index, mChildren, index + 1, count - index); 3417 children = mChildren; 3418 } else { 3419 System.arraycopy(children, index, children, index + 1, count - index); 3420 } 3421 children[index] = child; 3422 mChildrenCount++; 3423 if (mLastTouchDownIndex >= index) { 3424 mLastTouchDownIndex++; 3425 } 3426 } else { 3427 throw new IndexOutOfBoundsException("index=" + index + " count=" + count); 3428 } 3429 } 3430 3431 // This method also sets the child's mParent to null 3432 private void removeFromArray(int index) { 3433 final View[] children = mChildren; 3434 if (!(mTransitioningViews != null && mTransitioningViews.contains(children[index]))) { 3435 children[index].mParent = null; 3436 } 3437 final int count = mChildrenCount; 3438 if (index == count - 1) { 3439 children[--mChildrenCount] = null; 3440 } else if (index >= 0 && index < count) { 3441 System.arraycopy(children, index + 1, children, index, count - index - 1); 3442 children[--mChildrenCount] = null; 3443 } else { 3444 throw new IndexOutOfBoundsException(); 3445 } 3446 if (mLastTouchDownIndex == index) { 3447 mLastTouchDownTime = 0; 3448 mLastTouchDownIndex = -1; 3449 } else if (mLastTouchDownIndex > index) { 3450 mLastTouchDownIndex--; 3451 } 3452 } 3453 3454 // This method also sets the children's mParent to null 3455 private void removeFromArray(int start, int count) { 3456 final View[] children = mChildren; 3457 final int childrenCount = mChildrenCount; 3458 3459 start = Math.max(0, start); 3460 final int end = Math.min(childrenCount, start + count); 3461 3462 if (start == end) { 3463 return; 3464 } 3465 3466 if (end == childrenCount) { 3467 for (int i = start; i < end; i++) { 3468 children[i].mParent = null; 3469 children[i] = null; 3470 } 3471 } else { 3472 for (int i = start; i < end; i++) { 3473 children[i].mParent = null; 3474 } 3475 3476 // Since we're looping above, we might as well do the copy, but is arraycopy() 3477 // faster than the extra 2 bounds checks we would do in the loop? 3478 System.arraycopy(children, end, children, start, childrenCount - end); 3479 3480 for (int i = childrenCount - (end - start); i < childrenCount; i++) { 3481 children[i] = null; 3482 } 3483 } 3484 3485 mChildrenCount -= (end - start); 3486 } 3487 3488 private void bindLayoutAnimation(View child) { 3489 Animation a = mLayoutAnimationController.getAnimationForView(child); 3490 child.setAnimation(a); 3491 } 3492 3493 /** 3494 * Subclasses should override this method to set layout animation 3495 * parameters on the supplied child. 3496 * 3497 * @param child the child to associate with animation parameters 3498 * @param params the child's layout parameters which hold the animation 3499 * parameters 3500 * @param index the index of the child in the view group 3501 * @param count the number of children in the view group 3502 */ 3503 protected void attachLayoutAnimationParameters(View child, 3504 LayoutParams params, int index, int count) { 3505 LayoutAnimationController.AnimationParameters animationParams = 3506 params.layoutAnimationParameters; 3507 if (animationParams == null) { 3508 animationParams = new LayoutAnimationController.AnimationParameters(); 3509 params.layoutAnimationParameters = animationParams; 3510 } 3511 3512 animationParams.count = count; 3513 animationParams.index = index; 3514 } 3515 3516 /** 3517 * {@inheritDoc} 3518 * 3519 * <p><strong>Note:</strong> do not invoke this method from 3520 * {@link #draw(android.graphics.Canvas)}, {@link #onDraw(android.graphics.Canvas)}, 3521 * {@link #dispatchDraw(android.graphics.Canvas)} or any related method.</p> 3522 */ 3523 public void removeView(View view) { 3524 removeViewInternal(view); 3525 requestLayout(); 3526 invalidate(true); 3527 } 3528 3529 /** 3530 * Removes a view during layout. This is useful if in your onLayout() method, 3531 * you need to remove more views. 3532 * 3533 * <p><strong>Note:</strong> do not invoke this method from 3534 * {@link #draw(android.graphics.Canvas)}, {@link #onDraw(android.graphics.Canvas)}, 3535 * {@link #dispatchDraw(android.graphics.Canvas)} or any related method.</p> 3536 * 3537 * @param view the view to remove from the group 3538 */ 3539 public void removeViewInLayout(View view) { 3540 removeViewInternal(view); 3541 } 3542 3543 /** 3544 * Removes a range of views during layout. This is useful if in your onLayout() method, 3545 * you need to remove more views. 3546 * 3547 * <p><strong>Note:</strong> do not invoke this method from 3548 * {@link #draw(android.graphics.Canvas)}, {@link #onDraw(android.graphics.Canvas)}, 3549 * {@link #dispatchDraw(android.graphics.Canvas)} or any related method.</p> 3550 * 3551 * @param start the index of the first view to remove from the group 3552 * @param count the number of views to remove from the group 3553 */ 3554 public void removeViewsInLayout(int start, int count) { 3555 removeViewsInternal(start, count); 3556 } 3557 3558 /** 3559 * Removes the view at the specified position in the group. 3560 * 3561 * <p><strong>Note:</strong> do not invoke this method from 3562 * {@link #draw(android.graphics.Canvas)}, {@link #onDraw(android.graphics.Canvas)}, 3563 * {@link #dispatchDraw(android.graphics.Canvas)} or any related method.</p> 3564 * 3565 * @param index the position in the group of the view to remove 3566 */ 3567 public void removeViewAt(int index) { 3568 removeViewInternal(index, getChildAt(index)); 3569 requestLayout(); 3570 invalidate(true); 3571 } 3572 3573 /** 3574 * Removes the specified range of views from the group. 3575 * 3576 * <p><strong>Note:</strong> do not invoke this method from 3577 * {@link #draw(android.graphics.Canvas)}, {@link #onDraw(android.graphics.Canvas)}, 3578 * {@link #dispatchDraw(android.graphics.Canvas)} or any related method.</p> 3579 * 3580 * @param start the first position in the group of the range of views to remove 3581 * @param count the number of views to remove 3582 */ 3583 public void removeViews(int start, int count) { 3584 removeViewsInternal(start, count); 3585 requestLayout(); 3586 invalidate(true); 3587 } 3588 3589 private void removeViewInternal(View view) { 3590 final int index = indexOfChild(view); 3591 if (index >= 0) { 3592 removeViewInternal(index, view); 3593 } 3594 } 3595 3596 private void removeViewInternal(int index, View view) { 3597 3598 if (mTransition != null) { 3599 mTransition.removeChild(this, view); 3600 } 3601 3602 boolean clearChildFocus = false; 3603 if (view == mFocused) { 3604 view.unFocus(); 3605 clearChildFocus = true; 3606 } 3607 3608 view.clearAccessibilityFocus(); 3609 3610 cancelTouchTarget(view); 3611 cancelHoverTarget(view); 3612 3613 if (view.getAnimation() != null || 3614 (mTransitioningViews != null && mTransitioningViews.contains(view))) { 3615 addDisappearingView(view); 3616 } else if (view.mAttachInfo != null) { 3617 view.dispatchDetachedFromWindow(); 3618 } 3619 3620 if (view.hasTransientState()) { 3621 childHasTransientStateChanged(view, false); 3622 } 3623 3624 view.resetRtlProperties(); 3625 3626 onViewRemoved(view); 3627 3628 needGlobalAttributesUpdate(false); 3629 3630 removeFromArray(index); 3631 3632 if (clearChildFocus) { 3633 clearChildFocus(view); 3634 ensureInputFocusOnFirstFocusable(); 3635 } 3636 3637 if (view.isAccessibilityFocused()) { 3638 view.clearAccessibilityFocus(); 3639 } 3640 } 3641 3642 /** 3643 * Sets the LayoutTransition object for this ViewGroup. If the LayoutTransition object is 3644 * not null, changes in layout which occur because of children being added to or removed from 3645 * the ViewGroup will be animated according to the animations defined in that LayoutTransition 3646 * object. By default, the transition object is null (so layout changes are not animated). 3647 * 3648 * @param transition The LayoutTransition object that will animated changes in layout. A value 3649 * of <code>null</code> means no transition will run on layout changes. 3650 * @attr ref android.R.styleable#ViewGroup_animateLayoutChanges 3651 */ 3652 public void setLayoutTransition(LayoutTransition transition) { 3653 if (mTransition != null) { 3654 mTransition.removeTransitionListener(mLayoutTransitionListener); 3655 } 3656 mTransition = transition; 3657 if (mTransition != null) { 3658 mTransition.addTransitionListener(mLayoutTransitionListener); 3659 } 3660 } 3661 3662 /** 3663 * Gets the LayoutTransition object for this ViewGroup. If the LayoutTransition object is 3664 * not null, changes in layout which occur because of children being added to or removed from 3665 * the ViewGroup will be animated according to the animations defined in that LayoutTransition 3666 * object. By default, the transition object is null (so layout changes are not animated). 3667 * 3668 * @return LayoutTranstion The LayoutTransition object that will animated changes in layout. 3669 * A value of <code>null</code> means no transition will run on layout changes. 3670 */ 3671 public LayoutTransition getLayoutTransition() { 3672 return mTransition; 3673 } 3674 3675 private void removeViewsInternal(int start, int count) { 3676 final View focused = mFocused; 3677 final boolean detach = mAttachInfo != null; 3678 View clearChildFocus = null; 3679 3680 final View[] children = mChildren; 3681 final int end = start + count; 3682 3683 for (int i = start; i < end; i++) { 3684 final View view = children[i]; 3685 3686 if (mTransition != null) { 3687 mTransition.removeChild(this, view); 3688 } 3689 3690 if (view == focused) { 3691 view.unFocus(); 3692 clearChildFocus = view; 3693 } 3694 3695 view.clearAccessibilityFocus(); 3696 3697 cancelTouchTarget(view); 3698 cancelHoverTarget(view); 3699 3700 if (view.getAnimation() != null || 3701 (mTransitioningViews != null && mTransitioningViews.contains(view))) { 3702 addDisappearingView(view); 3703 } else if (detach) { 3704 view.dispatchDetachedFromWindow(); 3705 } 3706 3707 if (view.hasTransientState()) { 3708 childHasTransientStateChanged(view, false); 3709 } 3710 3711 needGlobalAttributesUpdate(false); 3712 3713 onViewRemoved(view); 3714 } 3715 3716 removeFromArray(start, count); 3717 3718 if (clearChildFocus != null) { 3719 clearChildFocus(clearChildFocus); 3720 ensureInputFocusOnFirstFocusable(); 3721 } 3722 } 3723 3724 /** 3725 * Call this method to remove all child views from the 3726 * ViewGroup. 3727 * 3728 * <p><strong>Note:</strong> do not invoke this method from 3729 * {@link #draw(android.graphics.Canvas)}, {@link #onDraw(android.graphics.Canvas)}, 3730 * {@link #dispatchDraw(android.graphics.Canvas)} or any related method.</p> 3731 */ 3732 public void removeAllViews() { 3733 removeAllViewsInLayout(); 3734 requestLayout(); 3735 invalidate(true); 3736 } 3737 3738 /** 3739 * Called by a ViewGroup subclass to remove child views from itself, 3740 * when it must first know its size on screen before it can calculate how many 3741 * child views it will render. An example is a Gallery or a ListView, which 3742 * may "have" 50 children, but actually only render the number of children 3743 * that can currently fit inside the object on screen. Do not call 3744 * this method unless you are extending ViewGroup and understand the 3745 * view measuring and layout pipeline. 3746 * 3747 * <p><strong>Note:</strong> do not invoke this method from 3748 * {@link #draw(android.graphics.Canvas)}, {@link #onDraw(android.graphics.Canvas)}, 3749 * {@link #dispatchDraw(android.graphics.Canvas)} or any related method.</p> 3750 */ 3751 public void removeAllViewsInLayout() { 3752 final int count = mChildrenCount; 3753 if (count <= 0) { 3754 return; 3755 } 3756 3757 final View[] children = mChildren; 3758 mChildrenCount = 0; 3759 3760 final View focused = mFocused; 3761 final boolean detach = mAttachInfo != null; 3762 View clearChildFocus = null; 3763 3764 needGlobalAttributesUpdate(false); 3765 3766 for (int i = count - 1; i >= 0; i--) { 3767 final View view = children[i]; 3768 3769 if (mTransition != null) { 3770 mTransition.removeChild(this, view); 3771 } 3772 3773 if (view == focused) { 3774 view.unFocus(); 3775 clearChildFocus = view; 3776 } 3777 3778 view.clearAccessibilityFocus(); 3779 3780 cancelTouchTarget(view); 3781 cancelHoverTarget(view); 3782 3783 if (view.getAnimation() != null || 3784 (mTransitioningViews != null && mTransitioningViews.contains(view))) { 3785 addDisappearingView(view); 3786 } else if (detach) { 3787 view.dispatchDetachedFromWindow(); 3788 } 3789 3790 if (view.hasTransientState()) { 3791 childHasTransientStateChanged(view, false); 3792 } 3793 3794 onViewRemoved(view); 3795 3796 view.mParent = null; 3797 children[i] = null; 3798 } 3799 3800 if (clearChildFocus != null) { 3801 clearChildFocus(clearChildFocus); 3802 ensureInputFocusOnFirstFocusable(); 3803 } 3804 } 3805 3806 /** 3807 * Finishes the removal of a detached view. This method will dispatch the detached from 3808 * window event and notify the hierarchy change listener. 3809 * <p> 3810 * This method is intended to be lightweight and makes no assumptions about whether the 3811 * parent or child should be redrawn. Proper use of this method will include also making 3812 * any appropriate {@link #requestLayout()} or {@link #invalidate()} calls. 3813 * For example, callers can {@link #post(Runnable) post} a {@link Runnable} 3814 * which performs a {@link #requestLayout()} on the next frame, after all detach/remove 3815 * calls are finished, causing layout to be run prior to redrawing the view hierarchy. 3816 * 3817 * @param child the child to be definitely removed from the view hierarchy 3818 * @param animate if true and the view has an animation, the view is placed in the 3819 * disappearing views list, otherwise, it is detached from the window 3820 * 3821 * @see #attachViewToParent(View, int, android.view.ViewGroup.LayoutParams) 3822 * @see #detachAllViewsFromParent() 3823 * @see #detachViewFromParent(View) 3824 * @see #detachViewFromParent(int) 3825 */ 3826 protected void removeDetachedView(View child, boolean animate) { 3827 if (mTransition != null) { 3828 mTransition.removeChild(this, child); 3829 } 3830 3831 if (child == mFocused) { 3832 child.clearFocus(); 3833 } 3834 3835 child.clearAccessibilityFocus(); 3836 3837 cancelTouchTarget(child); 3838 cancelHoverTarget(child); 3839 3840 if ((animate && child.getAnimation() != null) || 3841 (mTransitioningViews != null && mTransitioningViews.contains(child))) { 3842 addDisappearingView(child); 3843 } else if (child.mAttachInfo != null) { 3844 child.dispatchDetachedFromWindow(); 3845 } 3846 3847 if (child.hasTransientState()) { 3848 childHasTransientStateChanged(child, false); 3849 } 3850 3851 onViewRemoved(child); 3852 } 3853 3854 /** 3855 * Attaches a view to this view group. Attaching a view assigns this group as the parent, 3856 * sets the layout parameters and puts the view in the list of children so that 3857 * it can be retrieved by calling {@link #getChildAt(int)}. 3858 * <p> 3859 * This method is intended to be lightweight and makes no assumptions about whether the 3860 * parent or child should be redrawn. Proper use of this method will include also making 3861 * any appropriate {@link #requestLayout()} or {@link #invalidate()} calls. 3862 * For example, callers can {@link #post(Runnable) post} a {@link Runnable} 3863 * which performs a {@link #requestLayout()} on the next frame, after all detach/attach 3864 * calls are finished, causing layout to be run prior to redrawing the view hierarchy. 3865 * <p> 3866 * This method should be called only for views which were detached from their parent. 3867 * 3868 * @param child the child to attach 3869 * @param index the index at which the child should be attached 3870 * @param params the layout parameters of the child 3871 * 3872 * @see #removeDetachedView(View, boolean) 3873 * @see #detachAllViewsFromParent() 3874 * @see #detachViewFromParent(View) 3875 * @see #detachViewFromParent(int) 3876 */ 3877 protected void attachViewToParent(View child, int index, LayoutParams params) { 3878 child.mLayoutParams = params; 3879 3880 if (index < 0) { 3881 index = mChildrenCount; 3882 } 3883 3884 addInArray(child, index); 3885 3886 child.mParent = this; 3887 child.mPrivateFlags = (child.mPrivateFlags & ~PFLAG_DIRTY_MASK 3888 & ~PFLAG_DRAWING_CACHE_VALID) 3889 | PFLAG_DRAWN | PFLAG_INVALIDATED; 3890 this.mPrivateFlags |= PFLAG_INVALIDATED; 3891 3892 if (child.hasFocus()) { 3893 requestChildFocus(child, child.findFocus()); 3894 } 3895 } 3896 3897 /** 3898 * Detaches a view from its parent. Detaching a view should be followed 3899 * either by a call to 3900 * {@link #attachViewToParent(View, int, android.view.ViewGroup.LayoutParams)} 3901 * or a call to {@link #removeDetachedView(View, boolean)}. Detachment should only be 3902 * temporary; reattachment or removal should happen within the same drawing cycle as 3903 * detachment. When a view is detached, its parent is null and cannot be retrieved by a 3904 * call to {@link #getChildAt(int)}. 3905 * 3906 * @param child the child to detach 3907 * 3908 * @see #detachViewFromParent(int) 3909 * @see #detachViewsFromParent(int, int) 3910 * @see #detachAllViewsFromParent() 3911 * @see #attachViewToParent(View, int, android.view.ViewGroup.LayoutParams) 3912 * @see #removeDetachedView(View, boolean) 3913 */ 3914 protected void detachViewFromParent(View child) { 3915 removeFromArray(indexOfChild(child)); 3916 } 3917 3918 /** 3919 * Detaches a view from its parent. Detaching a view should be followed 3920 * either by a call to 3921 * {@link #attachViewToParent(View, int, android.view.ViewGroup.LayoutParams)} 3922 * or a call to {@link #removeDetachedView(View, boolean)}. Detachment should only be 3923 * temporary; reattachment or removal should happen within the same drawing cycle as 3924 * detachment. When a view is detached, its parent is null and cannot be retrieved by a 3925 * call to {@link #getChildAt(int)}. 3926 * 3927 * @param index the index of the child to detach 3928 * 3929 * @see #detachViewFromParent(View) 3930 * @see #detachAllViewsFromParent() 3931 * @see #detachViewsFromParent(int, int) 3932 * @see #attachViewToParent(View, int, android.view.ViewGroup.LayoutParams) 3933 * @see #removeDetachedView(View, boolean) 3934 */ 3935 protected void detachViewFromParent(int index) { 3936 removeFromArray(index); 3937 } 3938 3939 /** 3940 * Detaches a range of views from their parents. Detaching a view should be followed 3941 * either by a call to 3942 * {@link #attachViewToParent(View, int, android.view.ViewGroup.LayoutParams)} 3943 * or a call to {@link #removeDetachedView(View, boolean)}. Detachment should only be 3944 * temporary; reattachment or removal should happen within the same drawing cycle as 3945 * detachment. When a view is detached, its parent is null and cannot be retrieved by a 3946 * call to {@link #getChildAt(int)}. 3947 * 3948 * @param start the first index of the childrend range to detach 3949 * @param count the number of children to detach 3950 * 3951 * @see #detachViewFromParent(View) 3952 * @see #detachViewFromParent(int) 3953 * @see #detachAllViewsFromParent() 3954 * @see #attachViewToParent(View, int, android.view.ViewGroup.LayoutParams) 3955 * @see #removeDetachedView(View, boolean) 3956 */ 3957 protected void detachViewsFromParent(int start, int count) { 3958 removeFromArray(start, count); 3959 } 3960 3961 /** 3962 * Detaches all views from the parent. Detaching a view should be followed 3963 * either by a call to 3964 * {@link #attachViewToParent(View, int, android.view.ViewGroup.LayoutParams)} 3965 * or a call to {@link #removeDetachedView(View, boolean)}. Detachment should only be 3966 * temporary; reattachment or removal should happen within the same drawing cycle as 3967 * detachment. When a view is detached, its parent is null and cannot be retrieved by a 3968 * call to {@link #getChildAt(int)}. 3969 * 3970 * @see #detachViewFromParent(View) 3971 * @see #detachViewFromParent(int) 3972 * @see #detachViewsFromParent(int, int) 3973 * @see #attachViewToParent(View, int, android.view.ViewGroup.LayoutParams) 3974 * @see #removeDetachedView(View, boolean) 3975 */ 3976 protected void detachAllViewsFromParent() { 3977 final int count = mChildrenCount; 3978 if (count <= 0) { 3979 return; 3980 } 3981 3982 final View[] children = mChildren; 3983 mChildrenCount = 0; 3984 3985 for (int i = count - 1; i >= 0; i--) { 3986 children[i].mParent = null; 3987 children[i] = null; 3988 } 3989 } 3990 3991 /** 3992 * Don't call or override this method. It is used for the implementation of 3993 * the view hierarchy. 3994 */ 3995 public final void invalidateChild(View child, final Rect dirty) { 3996 ViewParent parent = this; 3997 3998 final AttachInfo attachInfo = mAttachInfo; 3999 if (attachInfo != null) { 4000 // If the child is drawing an animation, we want to copy this flag onto 4001 // ourselves and the parent to make sure the invalidate request goes 4002 // through 4003 final boolean drawAnimation = (child.mPrivateFlags & PFLAG_DRAW_ANIMATION) 4004 == PFLAG_DRAW_ANIMATION; 4005 4006 // Check whether the child that requests the invalidate is fully opaque 4007 // Views being animated or transformed are not considered opaque because we may 4008 // be invalidating their old position and need the parent to paint behind them. 4009 Matrix childMatrix = child.getMatrix(); 4010 final boolean isOpaque = child.isOpaque() && !drawAnimation && 4011 child.getAnimation() == null && childMatrix.isIdentity(); 4012 // Mark the child as dirty, using the appropriate flag 4013 // Make sure we do not set both flags at the same time 4014 int opaqueFlag = isOpaque ? PFLAG_DIRTY_OPAQUE : PFLAG_DIRTY; 4015 4016 if (child.mLayerType != LAYER_TYPE_NONE) { 4017 mPrivateFlags |= PFLAG_INVALIDATED; 4018 mPrivateFlags &= ~PFLAG_DRAWING_CACHE_VALID; 4019 child.mLocalDirtyRect.union(dirty); 4020 } 4021 4022 final int[] location = attachInfo.mInvalidateChildLocation; 4023 location[CHILD_LEFT_INDEX] = child.mLeft; 4024 location[CHILD_TOP_INDEX] = child.mTop; 4025 if (!childMatrix.isIdentity() || 4026 (mGroupFlags & ViewGroup.FLAG_SUPPORT_STATIC_TRANSFORMATIONS) != 0) { 4027 RectF boundingRect = attachInfo.mTmpTransformRect; 4028 boundingRect.set(dirty); 4029 Matrix transformMatrix; 4030 if ((mGroupFlags & ViewGroup.FLAG_SUPPORT_STATIC_TRANSFORMATIONS) != 0) { 4031 Transformation t = attachInfo.mTmpTransformation; 4032 boolean transformed = getChildStaticTransformation(child, t); 4033 if (transformed) { 4034 transformMatrix = attachInfo.mTmpMatrix; 4035 transformMatrix.set(t.getMatrix()); 4036 if (!childMatrix.isIdentity()) { 4037 transformMatrix.preConcat(childMatrix); 4038 } 4039 } else { 4040 transformMatrix = childMatrix; 4041 } 4042 } else { 4043 transformMatrix = childMatrix; 4044 } 4045 transformMatrix.mapRect(boundingRect); 4046 dirty.set((int) (boundingRect.left - 0.5f), 4047 (int) (boundingRect.top - 0.5f), 4048 (int) (boundingRect.right + 0.5f), 4049 (int) (boundingRect.bottom + 0.5f)); 4050 } 4051 4052 do { 4053 View view = null; 4054 if (parent instanceof View) { 4055 view = (View) parent; 4056 } 4057 4058 if (drawAnimation) { 4059 if (view != null) { 4060 view.mPrivateFlags |= PFLAG_DRAW_ANIMATION; 4061 } else if (parent instanceof ViewRootImpl) { 4062 ((ViewRootImpl) parent).mIsAnimating = true; 4063 } 4064 } 4065 4066 // If the parent is dirty opaque or not dirty, mark it dirty with the opaque 4067 // flag coming from the child that initiated the invalidate 4068 if (view != null) { 4069 if ((view.mViewFlags & FADING_EDGE_MASK) != 0 && 4070 view.getSolidColor() == 0) { 4071 opaqueFlag = PFLAG_DIRTY; 4072 } 4073 if ((view.mPrivateFlags & PFLAG_DIRTY_MASK) != PFLAG_DIRTY) { 4074 view.mPrivateFlags = (view.mPrivateFlags & ~PFLAG_DIRTY_MASK) | opaqueFlag; 4075 } 4076 } 4077 4078 parent = parent.invalidateChildInParent(location, dirty); 4079 if (view != null) { 4080 // Account for transform on current parent 4081 Matrix m = view.getMatrix(); 4082 if (!m.isIdentity()) { 4083 RectF boundingRect = attachInfo.mTmpTransformRect; 4084 boundingRect.set(dirty); 4085 m.mapRect(boundingRect); 4086 dirty.set((int) (boundingRect.left - 0.5f), 4087 (int) (boundingRect.top - 0.5f), 4088 (int) (boundingRect.right + 0.5f), 4089 (int) (boundingRect.bottom + 0.5f)); 4090 } 4091 } 4092 } while (parent != null); 4093 } 4094 } 4095 4096 /** 4097 * Don't call or override this method. It is used for the implementation of 4098 * the view hierarchy. 4099 * 4100 * This implementation returns null if this ViewGroup does not have a parent, 4101 * if this ViewGroup is already fully invalidated or if the dirty rectangle 4102 * does not intersect with this ViewGroup's bounds. 4103 */ 4104 public ViewParent invalidateChildInParent(final int[] location, final Rect dirty) { 4105 if ((mPrivateFlags & PFLAG_DRAWN) == PFLAG_DRAWN || 4106 (mPrivateFlags & PFLAG_DRAWING_CACHE_VALID) == PFLAG_DRAWING_CACHE_VALID) { 4107 if ((mGroupFlags & (FLAG_OPTIMIZE_INVALIDATE | FLAG_ANIMATION_DONE)) != 4108 FLAG_OPTIMIZE_INVALIDATE) { 4109 dirty.offset(location[CHILD_LEFT_INDEX] - mScrollX, 4110 location[CHILD_TOP_INDEX] - mScrollY); 4111 4112 final int left = mLeft; 4113 final int top = mTop; 4114 4115 if ((mGroupFlags & FLAG_CLIP_CHILDREN) == FLAG_CLIP_CHILDREN) { 4116 if (!dirty.intersect(0, 0, mRight - left, mBottom - top)) { 4117 dirty.setEmpty(); 4118 } 4119 } 4120 mPrivateFlags &= ~PFLAG_DRAWING_CACHE_VALID; 4121 4122 location[CHILD_LEFT_INDEX] = left; 4123 location[CHILD_TOP_INDEX] = top; 4124 4125 if (mLayerType != LAYER_TYPE_NONE) { 4126 mPrivateFlags |= PFLAG_INVALIDATED; 4127 mLocalDirtyRect.union(dirty); 4128 } 4129 4130 return mParent; 4131 4132 } else { 4133 mPrivateFlags &= ~PFLAG_DRAWN & ~PFLAG_DRAWING_CACHE_VALID; 4134 4135 location[CHILD_LEFT_INDEX] = mLeft; 4136 location[CHILD_TOP_INDEX] = mTop; 4137 if ((mGroupFlags & FLAG_CLIP_CHILDREN) == FLAG_CLIP_CHILDREN) { 4138 dirty.set(0, 0, mRight - mLeft, mBottom - mTop); 4139 } else { 4140 // in case the dirty rect extends outside the bounds of this container 4141 dirty.union(0, 0, mRight - mLeft, mBottom - mTop); 4142 } 4143 4144 if (mLayerType != LAYER_TYPE_NONE) { 4145 mPrivateFlags |= PFLAG_INVALIDATED; 4146 mLocalDirtyRect.union(dirty); 4147 } 4148 4149 return mParent; 4150 } 4151 } 4152 4153 return null; 4154 } 4155 4156 /** 4157 * Quick invalidation method called by View.invalidateViewProperty. This doesn't set the 4158 * DRAWN flags and doesn't handle the Animation logic that the default invalidation methods 4159 * do; all we want to do here is schedule a traversal with the appropriate dirty rect. 4160 * 4161 * @hide 4162 */ 4163 public void invalidateChildFast(View child, final Rect dirty) { 4164 ViewParent parent = this; 4165 4166 final AttachInfo attachInfo = mAttachInfo; 4167 if (attachInfo != null) { 4168 if (child.mLayerType != LAYER_TYPE_NONE) { 4169 child.mLocalDirtyRect.union(dirty); 4170 } 4171 4172 int left = child.mLeft; 4173 int top = child.mTop; 4174 if (!child.getMatrix().isIdentity()) { 4175 child.transformRect(dirty); 4176 } 4177 4178 do { 4179 if (parent instanceof ViewGroup) { 4180 ViewGroup parentVG = (ViewGroup) parent; 4181 if (parentVG.mLayerType != LAYER_TYPE_NONE) { 4182 // Layered parents should be recreated, not just re-issued 4183 parentVG.invalidate(); 4184 parent = null; 4185 } else { 4186 parent = parentVG.invalidateChildInParentFast(left, top, dirty); 4187 left = parentVG.mLeft; 4188 top = parentVG.mTop; 4189 } 4190 } else { 4191 // Reached the top; this calls into the usual invalidate method in 4192 // ViewRootImpl, which schedules a traversal 4193 final int[] location = attachInfo.mInvalidateChildLocation; 4194 location[0] = left; 4195 location[1] = top; 4196 parent = parent.invalidateChildInParent(location, dirty); 4197 } 4198 } while (parent != null); 4199 } 4200 } 4201 4202 /** 4203 * Quick invalidation method that simply transforms the dirty rect into the parent's 4204 * coordinate system, pruning the invalidation if the parent has already been invalidated. 4205 */ 4206 private ViewParent invalidateChildInParentFast(int left, int top, final Rect dirty) { 4207 if ((mPrivateFlags & PFLAG_DRAWN) == PFLAG_DRAWN || 4208 (mPrivateFlags & PFLAG_DRAWING_CACHE_VALID) == PFLAG_DRAWING_CACHE_VALID) { 4209 dirty.offset(left - mScrollX, top - mScrollY); 4210 4211 if ((mGroupFlags & FLAG_CLIP_CHILDREN) == 0 || 4212 dirty.intersect(0, 0, mRight - mLeft, mBottom - mTop)) { 4213 4214 if (mLayerType != LAYER_TYPE_NONE) { 4215 mLocalDirtyRect.union(dirty); 4216 } 4217 if (!getMatrix().isIdentity()) { 4218 transformRect(dirty); 4219 } 4220 4221 return mParent; 4222 } 4223 } 4224 4225 return null; 4226 } 4227 4228 /** 4229 * Offset a rectangle that is in a descendant's coordinate 4230 * space into our coordinate space. 4231 * @param descendant A descendant of this view 4232 * @param rect A rectangle defined in descendant's coordinate space. 4233 */ 4234 public final void offsetDescendantRectToMyCoords(View descendant, Rect rect) { 4235 offsetRectBetweenParentAndChild(descendant, rect, true, false); 4236 } 4237 4238 /** 4239 * Offset a rectangle that is in our coordinate space into an ancestor's 4240 * coordinate space. 4241 * @param descendant A descendant of this view 4242 * @param rect A rectangle defined in descendant's coordinate space. 4243 */ 4244 public final void offsetRectIntoDescendantCoords(View descendant, Rect rect) { 4245 offsetRectBetweenParentAndChild(descendant, rect, false, false); 4246 } 4247 4248 /** 4249 * Helper method that offsets a rect either from parent to descendant or 4250 * descendant to parent. 4251 */ 4252 void offsetRectBetweenParentAndChild(View descendant, Rect rect, 4253 boolean offsetFromChildToParent, boolean clipToBounds) { 4254 4255 // already in the same coord system :) 4256 if (descendant == this) { 4257 return; 4258 } 4259 4260 ViewParent theParent = descendant.mParent; 4261 4262 // search and offset up to the parent 4263 while ((theParent != null) 4264 && (theParent instanceof View) 4265 && (theParent != this)) { 4266 4267 if (offsetFromChildToParent) { 4268 rect.offset(descendant.mLeft - descendant.mScrollX, 4269 descendant.mTop - descendant.mScrollY); 4270 if (clipToBounds) { 4271 View p = (View) theParent; 4272 rect.intersect(0, 0, p.mRight - p.mLeft, p.mBottom - p.mTop); 4273 } 4274 } else { 4275 if (clipToBounds) { 4276 View p = (View) theParent; 4277 rect.intersect(0, 0, p.mRight - p.mLeft, p.mBottom - p.mTop); 4278 } 4279 rect.offset(descendant.mScrollX - descendant.mLeft, 4280 descendant.mScrollY - descendant.mTop); 4281 } 4282 4283 descendant = (View) theParent; 4284 theParent = descendant.mParent; 4285 } 4286 4287 // now that we are up to this view, need to offset one more time 4288 // to get into our coordinate space 4289 if (theParent == this) { 4290 if (offsetFromChildToParent) { 4291 rect.offset(descendant.mLeft - descendant.mScrollX, 4292 descendant.mTop - descendant.mScrollY); 4293 } else { 4294 rect.offset(descendant.mScrollX - descendant.mLeft, 4295 descendant.mScrollY - descendant.mTop); 4296 } 4297 } else { 4298 throw new IllegalArgumentException("parameter must be a descendant of this view"); 4299 } 4300 } 4301 4302 /** 4303 * Offset the vertical location of all children of this view by the specified number of pixels. 4304 * 4305 * @param offset the number of pixels to offset 4306 * 4307 * @hide 4308 */ 4309 public void offsetChildrenTopAndBottom(int offset) { 4310 final int count = mChildrenCount; 4311 final View[] children = mChildren; 4312 4313 for (int i = 0; i < count; i++) { 4314 final View v = children[i]; 4315 v.mTop += offset; 4316 v.mBottom += offset; 4317 if (v.mDisplayList != null) { 4318 v.mDisplayList.offsetTopBottom(offset); 4319 invalidateViewProperty(false, false); 4320 } 4321 } 4322 } 4323 4324 /** 4325 * {@inheritDoc} 4326 */ 4327 public boolean getChildVisibleRect(View child, Rect r, android.graphics.Point offset) { 4328 // It doesn't make a whole lot of sense to call this on a view that isn't attached, 4329 // but for some simple tests it can be useful. If we don't have attach info this 4330 // will allocate memory. 4331 final RectF rect = mAttachInfo != null ? mAttachInfo.mTmpTransformRect : new RectF(); 4332 rect.set(r); 4333 4334 if (!child.hasIdentityMatrix()) { 4335 child.getMatrix().mapRect(rect); 4336 } 4337 4338 int dx = child.mLeft - mScrollX; 4339 int dy = child.mTop - mScrollY; 4340 4341 rect.offset(dx, dy); 4342 4343 if (offset != null) { 4344 if (!child.hasIdentityMatrix()) { 4345 float[] position = mAttachInfo != null ? mAttachInfo.mTmpTransformLocation 4346 : new float[2]; 4347 position[0] = offset.x; 4348 position[1] = offset.y; 4349 child.getMatrix().mapPoints(position); 4350 offset.x = (int) (position[0] + 0.5f); 4351 offset.y = (int) (position[1] + 0.5f); 4352 } 4353 offset.x += dx; 4354 offset.y += dy; 4355 } 4356 4357 if (rect.intersect(0, 0, mRight - mLeft, mBottom - mTop)) { 4358 if (mParent == null) return true; 4359 r.set((int) (rect.left + 0.5f), (int) (rect.top + 0.5f), 4360 (int) (rect.right + 0.5f), (int) (rect.bottom + 0.5f)); 4361 return mParent.getChildVisibleRect(this, r, offset); 4362 } 4363 4364 return false; 4365 } 4366 4367 /** 4368 * {@inheritDoc} 4369 */ 4370 @Override 4371 public final void layout(int l, int t, int r, int b) { 4372 if (mTransition == null || !mTransition.isChangingLayout()) { 4373 if (mTransition != null) { 4374 mTransition.layoutChange(this); 4375 } 4376 super.layout(l, t, r, b); 4377 } else { 4378 // record the fact that we noop'd it; request layout when transition finishes 4379 mLayoutSuppressed = true; 4380 } 4381 } 4382 4383 /** 4384 * {@inheritDoc} 4385 */ 4386 @Override 4387 protected abstract void onLayout(boolean changed, 4388 int l, int t, int r, int b); 4389 4390 /** 4391 * Indicates whether the view group has the ability to animate its children 4392 * after the first layout. 4393 * 4394 * @return true if the children can be animated, false otherwise 4395 */ 4396 protected boolean canAnimate() { 4397 return mLayoutAnimationController != null; 4398 } 4399 4400 /** 4401 * Runs the layout animation. Calling this method triggers a relayout of 4402 * this view group. 4403 */ 4404 public void startLayoutAnimation() { 4405 if (mLayoutAnimationController != null) { 4406 mGroupFlags |= FLAG_RUN_ANIMATION; 4407 requestLayout(); 4408 } 4409 } 4410 4411 /** 4412 * Schedules the layout animation to be played after the next layout pass 4413 * of this view group. This can be used to restart the layout animation 4414 * when the content of the view group changes or when the activity is 4415 * paused and resumed. 4416 */ 4417 public void scheduleLayoutAnimation() { 4418 mGroupFlags |= FLAG_RUN_ANIMATION; 4419 } 4420 4421 /** 4422 * Sets the layout animation controller used to animate the group's 4423 * children after the first layout. 4424 * 4425 * @param controller the animation controller 4426 */ 4427 public void setLayoutAnimation(LayoutAnimationController controller) { 4428 mLayoutAnimationController = controller; 4429 if (mLayoutAnimationController != null) { 4430 mGroupFlags |= FLAG_RUN_ANIMATION; 4431 } 4432 } 4433 4434 /** 4435 * Returns the layout animation controller used to animate the group's 4436 * children. 4437 * 4438 * @return the current animation controller 4439 */ 4440 public LayoutAnimationController getLayoutAnimation() { 4441 return mLayoutAnimationController; 4442 } 4443 4444 /** 4445 * Indicates whether the children's drawing cache is used during a layout 4446 * animation. By default, the drawing cache is enabled but this will prevent 4447 * nested layout animations from working. To nest animations, you must disable 4448 * the cache. 4449 * 4450 * @return true if the animation cache is enabled, false otherwise 4451 * 4452 * @see #setAnimationCacheEnabled(boolean) 4453 * @see View#setDrawingCacheEnabled(boolean) 4454 */ 4455 @ViewDebug.ExportedProperty 4456 public boolean isAnimationCacheEnabled() { 4457 return (mGroupFlags & FLAG_ANIMATION_CACHE) == FLAG_ANIMATION_CACHE; 4458 } 4459 4460 /** 4461 * Enables or disables the children's drawing cache during a layout animation. 4462 * By default, the drawing cache is enabled but this will prevent nested 4463 * layout animations from working. To nest animations, you must disable the 4464 * cache. 4465 * 4466 * @param enabled true to enable the animation cache, false otherwise 4467 * 4468 * @see #isAnimationCacheEnabled() 4469 * @see View#setDrawingCacheEnabled(boolean) 4470 */ 4471 public void setAnimationCacheEnabled(boolean enabled) { 4472 setBooleanFlag(FLAG_ANIMATION_CACHE, enabled); 4473 } 4474 4475 /** 4476 * Indicates whether this ViewGroup will always try to draw its children using their 4477 * drawing cache. By default this property is enabled. 4478 * 4479 * @return true if the animation cache is enabled, false otherwise 4480 * 4481 * @see #setAlwaysDrawnWithCacheEnabled(boolean) 4482 * @see #setChildrenDrawnWithCacheEnabled(boolean) 4483 * @see View#setDrawingCacheEnabled(boolean) 4484 */ 4485 @ViewDebug.ExportedProperty(category = "drawing") 4486 public boolean isAlwaysDrawnWithCacheEnabled() { 4487 return (mGroupFlags & FLAG_ALWAYS_DRAWN_WITH_CACHE) == FLAG_ALWAYS_DRAWN_WITH_CACHE; 4488 } 4489 4490 /** 4491 * Indicates whether this ViewGroup will always try to draw its children using their 4492 * drawing cache. This property can be set to true when the cache rendering is 4493 * slightly different from the children's normal rendering. Renderings can be different, 4494 * for instance, when the cache's quality is set to low. 4495 * 4496 * When this property is disabled, the ViewGroup will use the drawing cache of its 4497 * children only when asked to. It's usually the task of subclasses to tell ViewGroup 4498 * when to start using the drawing cache and when to stop using it. 4499 * 4500 * @param always true to always draw with the drawing cache, false otherwise 4501 * 4502 * @see #isAlwaysDrawnWithCacheEnabled() 4503 * @see #setChildrenDrawnWithCacheEnabled(boolean) 4504 * @see View#setDrawingCacheEnabled(boolean) 4505 * @see View#setDrawingCacheQuality(int) 4506 */ 4507 public void setAlwaysDrawnWithCacheEnabled(boolean always) { 4508 setBooleanFlag(FLAG_ALWAYS_DRAWN_WITH_CACHE, always); 4509 } 4510 4511 /** 4512 * Indicates whether the ViewGroup is currently drawing its children using 4513 * their drawing cache. 4514 * 4515 * @return true if children should be drawn with their cache, false otherwise 4516 * 4517 * @see #setAlwaysDrawnWithCacheEnabled(boolean) 4518 * @see #setChildrenDrawnWithCacheEnabled(boolean) 4519 */ 4520 @ViewDebug.ExportedProperty(category = "drawing") 4521 protected boolean isChildrenDrawnWithCacheEnabled() { 4522 return (mGroupFlags & FLAG_CHILDREN_DRAWN_WITH_CACHE) == FLAG_CHILDREN_DRAWN_WITH_CACHE; 4523 } 4524 4525 /** 4526 * Tells the ViewGroup to draw its children using their drawing cache. This property 4527 * is ignored when {@link #isAlwaysDrawnWithCacheEnabled()} is true. A child's drawing cache 4528 * will be used only if it has been enabled. 4529 * 4530 * Subclasses should call this method to start and stop using the drawing cache when 4531 * they perform performance sensitive operations, like scrolling or animating. 4532 * 4533 * @param enabled true if children should be drawn with their cache, false otherwise 4534 * 4535 * @see #setAlwaysDrawnWithCacheEnabled(boolean) 4536 * @see #isChildrenDrawnWithCacheEnabled() 4537 */ 4538 protected void setChildrenDrawnWithCacheEnabled(boolean enabled) { 4539 setBooleanFlag(FLAG_CHILDREN_DRAWN_WITH_CACHE, enabled); 4540 } 4541 4542 /** 4543 * Indicates whether the ViewGroup is drawing its children in the order defined by 4544 * {@link #getChildDrawingOrder(int, int)}. 4545 * 4546 * @return true if children drawing order is defined by {@link #getChildDrawingOrder(int, int)}, 4547 * false otherwise 4548 * 4549 * @see #setChildrenDrawingOrderEnabled(boolean) 4550 * @see #getChildDrawingOrder(int, int) 4551 */ 4552 @ViewDebug.ExportedProperty(category = "drawing") 4553 protected boolean isChildrenDrawingOrderEnabled() { 4554 return (mGroupFlags & FLAG_USE_CHILD_DRAWING_ORDER) == FLAG_USE_CHILD_DRAWING_ORDER; 4555 } 4556 4557 /** 4558 * Tells the ViewGroup whether to draw its children in the order defined by the method 4559 * {@link #getChildDrawingOrder(int, int)}. 4560 * 4561 * @param enabled true if the order of the children when drawing is determined by 4562 * {@link #getChildDrawingOrder(int, int)}, false otherwise 4563 * 4564 * @see #isChildrenDrawingOrderEnabled() 4565 * @see #getChildDrawingOrder(int, int) 4566 */ 4567 protected void setChildrenDrawingOrderEnabled(boolean enabled) { 4568 setBooleanFlag(FLAG_USE_CHILD_DRAWING_ORDER, enabled); 4569 } 4570 4571 private void setBooleanFlag(int flag, boolean value) { 4572 if (value) { 4573 mGroupFlags |= flag; 4574 } else { 4575 mGroupFlags &= ~flag; 4576 } 4577 } 4578 4579 /** 4580 * Returns an integer indicating what types of drawing caches are kept in memory. 4581 * 4582 * @see #setPersistentDrawingCache(int) 4583 * @see #setAnimationCacheEnabled(boolean) 4584 * 4585 * @return one or a combination of {@link #PERSISTENT_NO_CACHE}, 4586 * {@link #PERSISTENT_ANIMATION_CACHE}, {@link #PERSISTENT_SCROLLING_CACHE} 4587 * and {@link #PERSISTENT_ALL_CACHES} 4588 */ 4589 @ViewDebug.ExportedProperty(category = "drawing", mapping = { 4590 @ViewDebug.IntToString(from = PERSISTENT_NO_CACHE, to = "NONE"), 4591 @ViewDebug.IntToString(from = PERSISTENT_ANIMATION_CACHE, to = "ANIMATION"), 4592 @ViewDebug.IntToString(from = PERSISTENT_SCROLLING_CACHE, to = "SCROLLING"), 4593 @ViewDebug.IntToString(from = PERSISTENT_ALL_CACHES, to = "ALL") 4594 }) 4595 public int getPersistentDrawingCache() { 4596 return mPersistentDrawingCache; 4597 } 4598 4599 /** 4600 * Indicates what types of drawing caches should be kept in memory after 4601 * they have been created. 4602 * 4603 * @see #getPersistentDrawingCache() 4604 * @see #setAnimationCacheEnabled(boolean) 4605 * 4606 * @param drawingCacheToKeep one or a combination of {@link #PERSISTENT_NO_CACHE}, 4607 * {@link #PERSISTENT_ANIMATION_CACHE}, {@link #PERSISTENT_SCROLLING_CACHE} 4608 * and {@link #PERSISTENT_ALL_CACHES} 4609 */ 4610 public void setPersistentDrawingCache(int drawingCacheToKeep) { 4611 mPersistentDrawingCache = drawingCacheToKeep & PERSISTENT_ALL_CACHES; 4612 } 4613 4614 /** 4615 * Returns the basis of alignment during layout operations on this view group: 4616 * either {@link #CLIP_BOUNDS} or {@link #OPTICAL_BOUNDS}. 4617 * 4618 * @return the layout mode to use during layout operations 4619 * 4620 * @see #setLayoutMode(int) 4621 * 4622 * @hide 4623 */ 4624 public int getLayoutMode() { 4625 return mLayoutMode; 4626 } 4627 4628 /** 4629 * Sets the basis of alignment during the layout of this view group. 4630 * Valid values are either {@link #CLIP_BOUNDS} or {@link #OPTICAL_BOUNDS}. 4631 * <p> 4632 * The default is {@link #CLIP_BOUNDS}. 4633 * 4634 * @param layoutMode the layout mode to use during layout operations 4635 * 4636 * @see #getLayoutMode() 4637 * 4638 * @hide 4639 */ 4640 public void setLayoutMode(int layoutMode) { 4641 if (mLayoutMode != layoutMode) { 4642 mLayoutMode = layoutMode; 4643 requestLayout(); 4644 } 4645 } 4646 4647 /** 4648 * Returns a new set of layout parameters based on the supplied attributes set. 4649 * 4650 * @param attrs the attributes to build the layout parameters from 4651 * 4652 * @return an instance of {@link android.view.ViewGroup.LayoutParams} or one 4653 * of its descendants 4654 */ 4655 public LayoutParams generateLayoutParams(AttributeSet attrs) { 4656 return new LayoutParams(getContext(), attrs); 4657 } 4658 4659 /** 4660 * Returns a safe set of layout parameters based on the supplied layout params. 4661 * When a ViewGroup is passed a View whose layout params do not pass the test of 4662 * {@link #checkLayoutParams(android.view.ViewGroup.LayoutParams)}, this method 4663 * is invoked. This method should return a new set of layout params suitable for 4664 * this ViewGroup, possibly by copying the appropriate attributes from the 4665 * specified set of layout params. 4666 * 4667 * @param p The layout parameters to convert into a suitable set of layout parameters 4668 * for this ViewGroup. 4669 * 4670 * @return an instance of {@link android.view.ViewGroup.LayoutParams} or one 4671 * of its descendants 4672 */ 4673 protected LayoutParams generateLayoutParams(ViewGroup.LayoutParams p) { 4674 return p; 4675 } 4676 4677 /** 4678 * Returns a set of default layout parameters. These parameters are requested 4679 * when the View passed to {@link #addView(View)} has no layout parameters 4680 * already set. If null is returned, an exception is thrown from addView. 4681 * 4682 * @return a set of default layout parameters or null 4683 */ 4684 protected LayoutParams generateDefaultLayoutParams() { 4685 return new LayoutParams(LayoutParams.WRAP_CONTENT, LayoutParams.WRAP_CONTENT); 4686 } 4687 4688 /** 4689 * {@inheritDoc} 4690 */ 4691 @Override 4692 protected void debug(int depth) { 4693 super.debug(depth); 4694 String output; 4695 4696 if (mFocused != null) { 4697 output = debugIndent(depth); 4698 output += "mFocused"; 4699 Log.d(VIEW_LOG_TAG, output); 4700 } 4701 if (mChildrenCount != 0) { 4702 output = debugIndent(depth); 4703 output += "{"; 4704 Log.d(VIEW_LOG_TAG, output); 4705 } 4706 int count = mChildrenCount; 4707 for (int i = 0; i < count; i++) { 4708 View child = mChildren[i]; 4709 child.debug(depth + 1); 4710 } 4711 4712 if (mChildrenCount != 0) { 4713 output = debugIndent(depth); 4714 output += "}"; 4715 Log.d(VIEW_LOG_TAG, output); 4716 } 4717 } 4718 4719 /** 4720 * Returns the position in the group of the specified child view. 4721 * 4722 * @param child the view for which to get the position 4723 * @return a positive integer representing the position of the view in the 4724 * group, or -1 if the view does not exist in the group 4725 */ 4726 public int indexOfChild(View child) { 4727 final int count = mChildrenCount; 4728 final View[] children = mChildren; 4729 for (int i = 0; i < count; i++) { 4730 if (children[i] == child) { 4731 return i; 4732 } 4733 } 4734 return -1; 4735 } 4736 4737 /** 4738 * Returns the number of children in the group. 4739 * 4740 * @return a positive integer representing the number of children in 4741 * the group 4742 */ 4743 public int getChildCount() { 4744 return mChildrenCount; 4745 } 4746 4747 /** 4748 * Returns the view at the specified position in the group. 4749 * 4750 * @param index the position at which to get the view from 4751 * @return the view at the specified position or null if the position 4752 * does not exist within the group 4753 */ 4754 public View getChildAt(int index) { 4755 if (index < 0 || index >= mChildrenCount) { 4756 return null; 4757 } 4758 return mChildren[index]; 4759 } 4760 4761 /** 4762 * Ask all of the children of this view to measure themselves, taking into 4763 * account both the MeasureSpec requirements for this view and its padding. 4764 * We skip children that are in the GONE state The heavy lifting is done in 4765 * getChildMeasureSpec. 4766 * 4767 * @param widthMeasureSpec The width requirements for this view 4768 * @param heightMeasureSpec The height requirements for this view 4769 */ 4770 protected void measureChildren(int widthMeasureSpec, int heightMeasureSpec) { 4771 final int size = mChildrenCount; 4772 final View[] children = mChildren; 4773 for (int i = 0; i < size; ++i) { 4774 final View child = children[i]; 4775 if ((child.mViewFlags & VISIBILITY_MASK) != GONE) { 4776 measureChild(child, widthMeasureSpec, heightMeasureSpec); 4777 } 4778 } 4779 } 4780 4781 /** 4782 * Ask one of the children of this view to measure itself, taking into 4783 * account both the MeasureSpec requirements for this view and its padding. 4784 * The heavy lifting is done in getChildMeasureSpec. 4785 * 4786 * @param child The child to measure 4787 * @param parentWidthMeasureSpec The width requirements for this view 4788 * @param parentHeightMeasureSpec The height requirements for this view 4789 */ 4790 protected void measureChild(View child, int parentWidthMeasureSpec, 4791 int parentHeightMeasureSpec) { 4792 final LayoutParams lp = child.getLayoutParams(); 4793 4794 final int childWidthMeasureSpec = getChildMeasureSpec(parentWidthMeasureSpec, 4795 mPaddingLeft + mPaddingRight, lp.width); 4796 final int childHeightMeasureSpec = getChildMeasureSpec(parentHeightMeasureSpec, 4797 mPaddingTop + mPaddingBottom, lp.height); 4798 4799 child.measure(childWidthMeasureSpec, childHeightMeasureSpec); 4800 } 4801 4802 /** 4803 * Ask one of the children of this view to measure itself, taking into 4804 * account both the MeasureSpec requirements for this view and its padding 4805 * and margins. The child must have MarginLayoutParams The heavy lifting is 4806 * done in getChildMeasureSpec. 4807 * 4808 * @param child The child to measure 4809 * @param parentWidthMeasureSpec The width requirements for this view 4810 * @param widthUsed Extra space that has been used up by the parent 4811 * horizontally (possibly by other children of the parent) 4812 * @param parentHeightMeasureSpec The height requirements for this view 4813 * @param heightUsed Extra space that has been used up by the parent 4814 * vertically (possibly by other children of the parent) 4815 */ 4816 protected void measureChildWithMargins(View child, 4817 int parentWidthMeasureSpec, int widthUsed, 4818 int parentHeightMeasureSpec, int heightUsed) { 4819 final MarginLayoutParams lp = (MarginLayoutParams) child.getLayoutParams(); 4820 final int layoutDirection = getLayoutDirection(); 4821 lp.resolveLayoutDirection(layoutDirection); 4822 4823 final int childWidthMeasureSpec = getChildMeasureSpec(parentWidthMeasureSpec, 4824 mPaddingLeft + mPaddingRight + lp.leftMargin + lp.rightMargin 4825 + widthUsed, lp.width); 4826 final int childHeightMeasureSpec = getChildMeasureSpec(parentHeightMeasureSpec, 4827 mPaddingTop + mPaddingBottom + lp.topMargin + lp.bottomMargin 4828 + heightUsed, lp.height); 4829 4830 child.measure(childWidthMeasureSpec, childHeightMeasureSpec); 4831 } 4832 4833 /** 4834 * Does the hard part of measureChildren: figuring out the MeasureSpec to 4835 * pass to a particular child. This method figures out the right MeasureSpec 4836 * for one dimension (height or width) of one child view. 4837 * 4838 * The goal is to combine information from our MeasureSpec with the 4839 * LayoutParams of the child to get the best possible results. For example, 4840 * if the this view knows its size (because its MeasureSpec has a mode of 4841 * EXACTLY), and the child has indicated in its LayoutParams that it wants 4842 * to be the same size as the parent, the parent should ask the child to 4843 * layout given an exact size. 4844 * 4845 * @param spec The requirements for this view 4846 * @param padding The padding of this view for the current dimension and 4847 * margins, if applicable 4848 * @param childDimension How big the child wants to be in the current 4849 * dimension 4850 * @return a MeasureSpec integer for the child 4851 */ 4852 public static int getChildMeasureSpec(int spec, int padding, int childDimension) { 4853 int specMode = MeasureSpec.getMode(spec); 4854 int specSize = MeasureSpec.getSize(spec); 4855 4856 int size = Math.max(0, specSize - padding); 4857 4858 int resultSize = 0; 4859 int resultMode = 0; 4860 4861 switch (specMode) { 4862 // Parent has imposed an exact size on us 4863 case MeasureSpec.EXACTLY: 4864 if (childDimension >= 0) { 4865 resultSize = childDimension; 4866 resultMode = MeasureSpec.EXACTLY; 4867 } else if (childDimension == LayoutParams.MATCH_PARENT) { 4868 // Child wants to be our size. So be it. 4869 resultSize = size; 4870 resultMode = MeasureSpec.EXACTLY; 4871 } else if (childDimension == LayoutParams.WRAP_CONTENT) { 4872 // Child wants to determine its own size. It can't be 4873 // bigger than us. 4874 resultSize = size; 4875 resultMode = MeasureSpec.AT_MOST; 4876 } 4877 break; 4878 4879 // Parent has imposed a maximum size on us 4880 case MeasureSpec.AT_MOST: 4881 if (childDimension >= 0) { 4882 // Child wants a specific size... so be it 4883 resultSize = childDimension; 4884 resultMode = MeasureSpec.EXACTLY; 4885 } else if (childDimension == LayoutParams.MATCH_PARENT) { 4886 // Child wants to be our size, but our size is not fixed. 4887 // Constrain child to not be bigger than us. 4888 resultSize = size; 4889 resultMode = MeasureSpec.AT_MOST; 4890 } else if (childDimension == LayoutParams.WRAP_CONTENT) { 4891 // Child wants to determine its own size. It can't be 4892 // bigger than us. 4893 resultSize = size; 4894 resultMode = MeasureSpec.AT_MOST; 4895 } 4896 break; 4897 4898 // Parent asked to see how big we want to be 4899 case MeasureSpec.UNSPECIFIED: 4900 if (childDimension >= 0) { 4901 // Child wants a specific size... let him have it 4902 resultSize = childDimension; 4903 resultMode = MeasureSpec.EXACTLY; 4904 } else if (childDimension == LayoutParams.MATCH_PARENT) { 4905 // Child wants to be our size... find out how big it should 4906 // be 4907 resultSize = 0; 4908 resultMode = MeasureSpec.UNSPECIFIED; 4909 } else if (childDimension == LayoutParams.WRAP_CONTENT) { 4910 // Child wants to determine its own size.... find out how 4911 // big it should be 4912 resultSize = 0; 4913 resultMode = MeasureSpec.UNSPECIFIED; 4914 } 4915 break; 4916 } 4917 return MeasureSpec.makeMeasureSpec(resultSize, resultMode); 4918 } 4919 4920 4921 /** 4922 * Removes any pending animations for views that have been removed. Call 4923 * this if you don't want animations for exiting views to stack up. 4924 */ 4925 public void clearDisappearingChildren() { 4926 if (mDisappearingChildren != null) { 4927 mDisappearingChildren.clear(); 4928 invalidate(); 4929 } 4930 } 4931 4932 /** 4933 * Add a view which is removed from mChildren but still needs animation 4934 * 4935 * @param v View to add 4936 */ 4937 private void addDisappearingView(View v) { 4938 ArrayList<View> disappearingChildren = mDisappearingChildren; 4939 4940 if (disappearingChildren == null) { 4941 disappearingChildren = mDisappearingChildren = new ArrayList<View>(); 4942 } 4943 4944 disappearingChildren.add(v); 4945 } 4946 4947 /** 4948 * Cleanup a view when its animation is done. This may mean removing it from 4949 * the list of disappearing views. 4950 * 4951 * @param view The view whose animation has finished 4952 * @param animation The animation, cannot be null 4953 */ 4954 void finishAnimatingView(final View view, Animation animation) { 4955 final ArrayList<View> disappearingChildren = mDisappearingChildren; 4956 if (disappearingChildren != null) { 4957 if (disappearingChildren.contains(view)) { 4958 disappearingChildren.remove(view); 4959 4960 if (view.mAttachInfo != null) { 4961 view.dispatchDetachedFromWindow(); 4962 } 4963 4964 view.clearAnimation(); 4965 mGroupFlags |= FLAG_INVALIDATE_REQUIRED; 4966 } 4967 } 4968 4969 if (animation != null && !animation.getFillAfter()) { 4970 view.clearAnimation(); 4971 } 4972 4973 if ((view.mPrivateFlags & PFLAG_ANIMATION_STARTED) == PFLAG_ANIMATION_STARTED) { 4974 view.onAnimationEnd(); 4975 // Should be performed by onAnimationEnd() but this avoid an infinite loop, 4976 // so we'd rather be safe than sorry 4977 view.mPrivateFlags &= ~PFLAG_ANIMATION_STARTED; 4978 // Draw one more frame after the animation is done 4979 mGroupFlags |= FLAG_INVALIDATE_REQUIRED; 4980 } 4981 } 4982 4983 /** 4984 * Utility function called by View during invalidation to determine whether a view that 4985 * is invisible or gone should still be invalidated because it is being transitioned (and 4986 * therefore still needs to be drawn). 4987 */ 4988 boolean isViewTransitioning(View view) { 4989 return (mTransitioningViews != null && mTransitioningViews.contains(view)); 4990 } 4991 4992 /** 4993 * This method tells the ViewGroup that the given View object, which should have this 4994 * ViewGroup as its parent, 4995 * should be kept around (re-displayed when the ViewGroup draws its children) even if it 4996 * is removed from its parent. This allows animations, such as those used by 4997 * {@link android.app.Fragment} and {@link android.animation.LayoutTransition} to animate 4998 * the removal of views. A call to this method should always be accompanied by a later call 4999 * to {@link #endViewTransition(View)}, such as after an animation on the View has finished, 5000 * so that the View finally gets removed. 5001 * 5002 * @param view The View object to be kept visible even if it gets removed from its parent. 5003 */ 5004 public void startViewTransition(View view) { 5005 if (view.mParent == this) { 5006 if (mTransitioningViews == null) { 5007 mTransitioningViews = new ArrayList<View>(); 5008 } 5009 mTransitioningViews.add(view); 5010 } 5011 } 5012 5013 /** 5014 * This method should always be called following an earlier call to 5015 * {@link #startViewTransition(View)}. The given View is finally removed from its parent 5016 * and will no longer be displayed. Note that this method does not perform the functionality 5017 * of removing a view from its parent; it just discontinues the display of a View that 5018 * has previously been removed. 5019 * 5020 * @return view The View object that has been removed but is being kept around in the visible 5021 * hierarchy by an earlier call to {@link #startViewTransition(View)}. 5022 */ 5023 public void endViewTransition(View view) { 5024 if (mTransitioningViews != null) { 5025 mTransitioningViews.remove(view); 5026 final ArrayList<View> disappearingChildren = mDisappearingChildren; 5027 if (disappearingChildren != null && disappearingChildren.contains(view)) { 5028 disappearingChildren.remove(view); 5029 if (mVisibilityChangingChildren != null && 5030 mVisibilityChangingChildren.contains(view)) { 5031 mVisibilityChangingChildren.remove(view); 5032 } else { 5033 if (view.mAttachInfo != null) { 5034 view.dispatchDetachedFromWindow(); 5035 } 5036 if (view.mParent != null) { 5037 view.mParent = null; 5038 } 5039 } 5040 invalidate(); 5041 } 5042 } 5043 } 5044 5045 private LayoutTransition.TransitionListener mLayoutTransitionListener = 5046 new LayoutTransition.TransitionListener() { 5047 @Override 5048 public void startTransition(LayoutTransition transition, ViewGroup container, 5049 View view, int transitionType) { 5050 // We only care about disappearing items, since we need special logic to keep 5051 // those items visible after they've been 'removed' 5052 if (transitionType == LayoutTransition.DISAPPEARING) { 5053 startViewTransition(view); 5054 } 5055 } 5056 5057 @Override 5058 public void endTransition(LayoutTransition transition, ViewGroup container, 5059 View view, int transitionType) { 5060 if (mLayoutSuppressed && !transition.isChangingLayout()) { 5061 requestLayout(); 5062 mLayoutSuppressed = false; 5063 } 5064 if (transitionType == LayoutTransition.DISAPPEARING && mTransitioningViews != null) { 5065 endViewTransition(view); 5066 } 5067 } 5068 }; 5069 5070 /** 5071 * {@inheritDoc} 5072 */ 5073 @Override 5074 public boolean gatherTransparentRegion(Region region) { 5075 // If no transparent regions requested, we are always opaque. 5076 final boolean meOpaque = (mPrivateFlags & View.PFLAG_REQUEST_TRANSPARENT_REGIONS) == 0; 5077 if (meOpaque && region == null) { 5078 // The caller doesn't care about the region, so stop now. 5079 return true; 5080 } 5081 super.gatherTransparentRegion(region); 5082 final View[] children = mChildren; 5083 final int count = mChildrenCount; 5084 boolean noneOfTheChildrenAreTransparent = true; 5085 for (int i = 0; i < count; i++) { 5086 final View child = children[i]; 5087 if ((child.mViewFlags & VISIBILITY_MASK) == VISIBLE || child.getAnimation() != null) { 5088 if (!child.gatherTransparentRegion(region)) { 5089 noneOfTheChildrenAreTransparent = false; 5090 } 5091 } 5092 } 5093 return meOpaque || noneOfTheChildrenAreTransparent; 5094 } 5095 5096 /** 5097 * {@inheritDoc} 5098 */ 5099 public void requestTransparentRegion(View child) { 5100 if (child != null) { 5101 child.mPrivateFlags |= View.PFLAG_REQUEST_TRANSPARENT_REGIONS; 5102 if (mParent != null) { 5103 mParent.requestTransparentRegion(this); 5104 } 5105 } 5106 } 5107 5108 5109 @Override 5110 protected boolean fitSystemWindows(Rect insets) { 5111 boolean done = super.fitSystemWindows(insets); 5112 if (!done) { 5113 final int count = mChildrenCount; 5114 final View[] children = mChildren; 5115 for (int i = 0; i < count; i++) { 5116 done = children[i].fitSystemWindows(insets); 5117 if (done) { 5118 break; 5119 } 5120 } 5121 } 5122 return done; 5123 } 5124 5125 /** 5126 * Returns the animation listener to which layout animation events are 5127 * sent. 5128 * 5129 * @return an {@link android.view.animation.Animation.AnimationListener} 5130 */ 5131 public Animation.AnimationListener getLayoutAnimationListener() { 5132 return mAnimationListener; 5133 } 5134 5135 @Override 5136 protected void drawableStateChanged() { 5137 super.drawableStateChanged(); 5138 5139 if ((mGroupFlags & FLAG_NOTIFY_CHILDREN_ON_DRAWABLE_STATE_CHANGE) != 0) { 5140 if ((mGroupFlags & FLAG_ADD_STATES_FROM_CHILDREN) != 0) { 5141 throw new IllegalStateException("addStateFromChildren cannot be enabled if a" 5142 + " child has duplicateParentState set to true"); 5143 } 5144 5145 final View[] children = mChildren; 5146 final int count = mChildrenCount; 5147 5148 for (int i = 0; i < count; i++) { 5149 final View child = children[i]; 5150 if ((child.mViewFlags & DUPLICATE_PARENT_STATE) != 0) { 5151 child.refreshDrawableState(); 5152 } 5153 } 5154 } 5155 } 5156 5157 @Override 5158 public void jumpDrawablesToCurrentState() { 5159 super.jumpDrawablesToCurrentState(); 5160 final View[] children = mChildren; 5161 final int count = mChildrenCount; 5162 for (int i = 0; i < count; i++) { 5163 children[i].jumpDrawablesToCurrentState(); 5164 } 5165 } 5166 5167 @Override 5168 protected int[] onCreateDrawableState(int extraSpace) { 5169 if ((mGroupFlags & FLAG_ADD_STATES_FROM_CHILDREN) == 0) { 5170 return super.onCreateDrawableState(extraSpace); 5171 } 5172 5173 int need = 0; 5174 int n = getChildCount(); 5175 for (int i = 0; i < n; i++) { 5176 int[] childState = getChildAt(i).getDrawableState(); 5177 5178 if (childState != null) { 5179 need += childState.length; 5180 } 5181 } 5182 5183 int[] state = super.onCreateDrawableState(extraSpace + need); 5184 5185 for (int i = 0; i < n; i++) { 5186 int[] childState = getChildAt(i).getDrawableState(); 5187 5188 if (childState != null) { 5189 state = mergeDrawableStates(state, childState); 5190 } 5191 } 5192 5193 return state; 5194 } 5195 5196 /** 5197 * Sets whether this ViewGroup's drawable states also include 5198 * its children's drawable states. This is used, for example, to 5199 * make a group appear to be focused when its child EditText or button 5200 * is focused. 5201 */ 5202 public void setAddStatesFromChildren(boolean addsStates) { 5203 if (addsStates) { 5204 mGroupFlags |= FLAG_ADD_STATES_FROM_CHILDREN; 5205 } else { 5206 mGroupFlags &= ~FLAG_ADD_STATES_FROM_CHILDREN; 5207 } 5208 5209 refreshDrawableState(); 5210 } 5211 5212 /** 5213 * Returns whether this ViewGroup's drawable states also include 5214 * its children's drawable states. This is used, for example, to 5215 * make a group appear to be focused when its child EditText or button 5216 * is focused. 5217 */ 5218 public boolean addStatesFromChildren() { 5219 return (mGroupFlags & FLAG_ADD_STATES_FROM_CHILDREN) != 0; 5220 } 5221 5222 /** 5223 * If {@link #addStatesFromChildren} is true, refreshes this group's 5224 * drawable state (to include the states from its children). 5225 */ 5226 public void childDrawableStateChanged(View child) { 5227 if ((mGroupFlags & FLAG_ADD_STATES_FROM_CHILDREN) != 0) { 5228 refreshDrawableState(); 5229 } 5230 } 5231 5232 /** 5233 * Specifies the animation listener to which layout animation events must 5234 * be sent. Only 5235 * {@link android.view.animation.Animation.AnimationListener#onAnimationStart(Animation)} 5236 * and 5237 * {@link android.view.animation.Animation.AnimationListener#onAnimationEnd(Animation)} 5238 * are invoked. 5239 * 5240 * @param animationListener the layout animation listener 5241 */ 5242 public void setLayoutAnimationListener(Animation.AnimationListener animationListener) { 5243 mAnimationListener = animationListener; 5244 } 5245 5246 /** 5247 * This method is called by LayoutTransition when there are 'changing' animations that need 5248 * to start after the layout/setup phase. The request is forwarded to the ViewAncestor, who 5249 * starts all pending transitions prior to the drawing phase in the current traversal. 5250 * 5251 * @param transition The LayoutTransition to be started on the next traversal. 5252 * 5253 * @hide 5254 */ 5255 public void requestTransitionStart(LayoutTransition transition) { 5256 ViewRootImpl viewAncestor = getViewRootImpl(); 5257 if (viewAncestor != null) { 5258 viewAncestor.requestTransitionStart(transition); 5259 } 5260 } 5261 5262 /** 5263 * @hide 5264 */ 5265 @Override 5266 public void resolveRtlPropertiesIfNeeded() { 5267 super.resolveRtlPropertiesIfNeeded(); 5268 int count = getChildCount(); 5269 for (int i = 0; i < count; i++) { 5270 final View child = getChildAt(i); 5271 if (child.isLayoutDirectionInherited()) { 5272 child.resolveRtlPropertiesIfNeeded(); 5273 } 5274 } 5275 } 5276 5277 /** 5278 * @hide 5279 */ 5280 @Override 5281 public boolean resolveLayoutDirection() { 5282 final boolean result = super.resolveLayoutDirection(); 5283 if (result) { 5284 int count = getChildCount(); 5285 for (int i = 0; i < count; i++) { 5286 final View child = getChildAt(i); 5287 if (child.isLayoutDirectionInherited()) { 5288 child.resolveLayoutDirection(); 5289 } 5290 } 5291 } 5292 return result; 5293 } 5294 5295 /** 5296 * @hide 5297 */ 5298 @Override 5299 public boolean resolveTextDirection() { 5300 final boolean result = super.resolveTextDirection(); 5301 if (result) { 5302 int count = getChildCount(); 5303 for (int i = 0; i < count; i++) { 5304 final View child = getChildAt(i); 5305 if (child.isTextDirectionInherited()) { 5306 child.resolveTextDirection(); 5307 } 5308 } 5309 } 5310 return result; 5311 } 5312 5313 /** 5314 * @hide 5315 */ 5316 @Override 5317 public boolean resolveTextAlignment() { 5318 final boolean result = super.resolveTextAlignment(); 5319 if (result) { 5320 int count = getChildCount(); 5321 for (int i = 0; i < count; i++) { 5322 final View child = getChildAt(i); 5323 if (child.isTextAlignmentInherited()) { 5324 child.resolveTextAlignment(); 5325 } 5326 } 5327 } 5328 return result; 5329 } 5330 5331 /** 5332 * @hide 5333 */ 5334 @Override 5335 public void resolvePadding() { 5336 super.resolvePadding(); 5337 int count = getChildCount(); 5338 for (int i = 0; i < count; i++) { 5339 final View child = getChildAt(i); 5340 if (child.isLayoutDirectionInherited()) { 5341 child.resolvePadding(); 5342 } 5343 } 5344 } 5345 5346 /** 5347 * @hide 5348 */ 5349 @Override 5350 protected void resolveDrawables() { 5351 super.resolveDrawables(); 5352 int count = getChildCount(); 5353 for (int i = 0; i < count; i++) { 5354 final View child = getChildAt(i); 5355 if (child.isLayoutDirectionInherited()) { 5356 child.resolveDrawables(); 5357 } 5358 } 5359 } 5360 5361 /** 5362 * @hide 5363 */ 5364 @Override 5365 public void resetRtlProperties() { 5366 super.resetRtlProperties(); 5367 int count = getChildCount(); 5368 for (int i = 0; i < count; i++) { 5369 final View child = getChildAt(i); 5370 if (child.isLayoutDirectionInherited()) { 5371 child.resetRtlProperties(); 5372 } 5373 } 5374 } 5375 5376 /** 5377 * @hide 5378 */ 5379 @Override 5380 public void resetResolvedLayoutDirection() { 5381 super.resetResolvedLayoutDirection(); 5382 5383 int count = getChildCount(); 5384 for (int i = 0; i < count; i++) { 5385 final View child = getChildAt(i); 5386 if (child.isLayoutDirectionInherited()) { 5387 child.resetResolvedLayoutDirection(); 5388 } 5389 } 5390 } 5391 5392 /** 5393 * @hide 5394 */ 5395 @Override 5396 public void resetResolvedTextDirection() { 5397 super.resetResolvedTextDirection(); 5398 5399 int count = getChildCount(); 5400 for (int i = 0; i < count; i++) { 5401 final View child = getChildAt(i); 5402 if (child.isTextDirectionInherited()) { 5403 child.resetResolvedTextDirection(); 5404 } 5405 } 5406 } 5407 5408 /** 5409 * @hide 5410 */ 5411 @Override 5412 public void resetResolvedTextAlignment() { 5413 super.resetResolvedTextAlignment(); 5414 5415 int count = getChildCount(); 5416 for (int i = 0; i < count; i++) { 5417 final View child = getChildAt(i); 5418 if (child.isTextAlignmentInherited()) { 5419 child.resetResolvedTextAlignment(); 5420 } 5421 } 5422 } 5423 5424 /** 5425 * @hide 5426 */ 5427 @Override 5428 public void resetResolvedPadding() { 5429 super.resetResolvedPadding(); 5430 5431 int count = getChildCount(); 5432 for (int i = 0; i < count; i++) { 5433 final View child = getChildAt(i); 5434 if (child.isLayoutDirectionInherited()) { 5435 child.resetResolvedPadding(); 5436 } 5437 } 5438 } 5439 5440 /** 5441 * @hide 5442 */ 5443 @Override 5444 protected void resetResolvedDrawables() { 5445 super.resetResolvedDrawables(); 5446 5447 int count = getChildCount(); 5448 for (int i = 0; i < count; i++) { 5449 final View child = getChildAt(i); 5450 if (child.isLayoutDirectionInherited()) { 5451 child.resetResolvedDrawables(); 5452 } 5453 } 5454 } 5455 5456 /** 5457 * Return true if the pressed state should be delayed for children or descendants of this 5458 * ViewGroup. Generally, this should be done for containers that can scroll, such as a List. 5459 * This prevents the pressed state from appearing when the user is actually trying to scroll 5460 * the content. 5461 * 5462 * The default implementation returns true for compatibility reasons. Subclasses that do 5463 * not scroll should generally override this method and return false. 5464 */ 5465 public boolean shouldDelayChildPressedState() { 5466 return true; 5467 } 5468 5469 /** @hide */ 5470 protected void onSetLayoutParams(View child, LayoutParams layoutParams) { 5471 } 5472 5473 /** 5474 * LayoutParams are used by views to tell their parents how they want to be 5475 * laid out. See 5476 * {@link android.R.styleable#ViewGroup_Layout ViewGroup Layout Attributes} 5477 * for a list of all child view attributes that this class supports. 5478 * 5479 * <p> 5480 * The base LayoutParams class just describes how big the view wants to be 5481 * for both width and height. For each dimension, it can specify one of: 5482 * <ul> 5483 * <li>FILL_PARENT (renamed MATCH_PARENT in API Level 8 and higher), which 5484 * means that the view wants to be as big as its parent (minus padding) 5485 * <li> WRAP_CONTENT, which means that the view wants to be just big enough 5486 * to enclose its content (plus padding) 5487 * <li> an exact number 5488 * </ul> 5489 * There are subclasses of LayoutParams for different subclasses of 5490 * ViewGroup. For example, AbsoluteLayout has its own subclass of 5491 * LayoutParams which adds an X and Y value.</p> 5492 * 5493 * <div class="special reference"> 5494 * <h3>Developer Guides</h3> 5495 * <p>For more information about creating user interface layouts, read the 5496 * <a href="{@docRoot}guide/topics/ui/declaring-layout.html">XML Layouts</a> developer 5497 * guide.</p></div> 5498 * 5499 * @attr ref android.R.styleable#ViewGroup_Layout_layout_height 5500 * @attr ref android.R.styleable#ViewGroup_Layout_layout_width 5501 */ 5502 public static class LayoutParams { 5503 /** 5504 * Special value for the height or width requested by a View. 5505 * FILL_PARENT means that the view wants to be as big as its parent, 5506 * minus the parent's padding, if any. This value is deprecated 5507 * starting in API Level 8 and replaced by {@link #MATCH_PARENT}. 5508 */ 5509 @SuppressWarnings({"UnusedDeclaration"}) 5510 @Deprecated 5511 public static final int FILL_PARENT = -1; 5512 5513 /** 5514 * Special value for the height or width requested by a View. 5515 * MATCH_PARENT means that the view wants to be as big as its parent, 5516 * minus the parent's padding, if any. Introduced in API Level 8. 5517 */ 5518 public static final int MATCH_PARENT = -1; 5519 5520 /** 5521 * Special value for the height or width requested by a View. 5522 * WRAP_CONTENT means that the view wants to be just large enough to fit 5523 * its own internal content, taking its own padding into account. 5524 */ 5525 public static final int WRAP_CONTENT = -2; 5526 5527 /** 5528 * Information about how wide the view wants to be. Can be one of the 5529 * constants FILL_PARENT (replaced by MATCH_PARENT , 5530 * in API Level 8) or WRAP_CONTENT. or an exact size. 5531 */ 5532 @ViewDebug.ExportedProperty(category = "layout", mapping = { 5533 @ViewDebug.IntToString(from = MATCH_PARENT, to = "MATCH_PARENT"), 5534 @ViewDebug.IntToString(from = WRAP_CONTENT, to = "WRAP_CONTENT") 5535 }) 5536 public int width; 5537 5538 /** 5539 * Information about how tall the view wants to be. Can be one of the 5540 * constants FILL_PARENT (replaced by MATCH_PARENT , 5541 * in API Level 8) or WRAP_CONTENT. or an exact size. 5542 */ 5543 @ViewDebug.ExportedProperty(category = "layout", mapping = { 5544 @ViewDebug.IntToString(from = MATCH_PARENT, to = "MATCH_PARENT"), 5545 @ViewDebug.IntToString(from = WRAP_CONTENT, to = "WRAP_CONTENT") 5546 }) 5547 public int height; 5548 5549 /** 5550 * Used to animate layouts. 5551 */ 5552 public LayoutAnimationController.AnimationParameters layoutAnimationParameters; 5553 5554 /** 5555 * Creates a new set of layout parameters. The values are extracted from 5556 * the supplied attributes set and context. The XML attributes mapped 5557 * to this set of layout parameters are: 5558 * 5559 * <ul> 5560 * <li><code>layout_width</code>: the width, either an exact value, 5561 * {@link #WRAP_CONTENT}, or {@link #FILL_PARENT} (replaced by 5562 * {@link #MATCH_PARENT} in API Level 8)</li> 5563 * <li><code>layout_height</code>: the height, either an exact value, 5564 * {@link #WRAP_CONTENT}, or {@link #FILL_PARENT} (replaced by 5565 * {@link #MATCH_PARENT} in API Level 8)</li> 5566 * </ul> 5567 * 5568 * @param c the application environment 5569 * @param attrs the set of attributes from which to extract the layout 5570 * parameters' values 5571 */ 5572 public LayoutParams(Context c, AttributeSet attrs) { 5573 TypedArray a = c.obtainStyledAttributes(attrs, R.styleable.ViewGroup_Layout); 5574 setBaseAttributes(a, 5575 R.styleable.ViewGroup_Layout_layout_width, 5576 R.styleable.ViewGroup_Layout_layout_height); 5577 a.recycle(); 5578 } 5579 5580 /** 5581 * Creates a new set of layout parameters with the specified width 5582 * and height. 5583 * 5584 * @param width the width, either {@link #WRAP_CONTENT}, 5585 * {@link #FILL_PARENT} (replaced by {@link #MATCH_PARENT} in 5586 * API Level 8), or a fixed size in pixels 5587 * @param height the height, either {@link #WRAP_CONTENT}, 5588 * {@link #FILL_PARENT} (replaced by {@link #MATCH_PARENT} in 5589 * API Level 8), or a fixed size in pixels 5590 */ 5591 public LayoutParams(int width, int height) { 5592 this.width = width; 5593 this.height = height; 5594 } 5595 5596 /** 5597 * Copy constructor. Clones the width and height values of the source. 5598 * 5599 * @param source The layout params to copy from. 5600 */ 5601 public LayoutParams(LayoutParams source) { 5602 this.width = source.width; 5603 this.height = source.height; 5604 } 5605 5606 /** 5607 * Used internally by MarginLayoutParams. 5608 * @hide 5609 */ 5610 LayoutParams() { 5611 } 5612 5613 /** 5614 * Extracts the layout parameters from the supplied attributes. 5615 * 5616 * @param a the style attributes to extract the parameters from 5617 * @param widthAttr the identifier of the width attribute 5618 * @param heightAttr the identifier of the height attribute 5619 */ 5620 protected void setBaseAttributes(TypedArray a, int widthAttr, int heightAttr) { 5621 width = a.getLayoutDimension(widthAttr, "layout_width"); 5622 height = a.getLayoutDimension(heightAttr, "layout_height"); 5623 } 5624 5625 /** 5626 * Resolve layout parameters depending on the layout direction. Subclasses that care about 5627 * layoutDirection changes should override this method. The default implementation does 5628 * nothing. 5629 * 5630 * @param layoutDirection the direction of the layout 5631 * 5632 * {@link View#LAYOUT_DIRECTION_LTR} 5633 * {@link View#LAYOUT_DIRECTION_RTL} 5634 */ 5635 public void resolveLayoutDirection(int layoutDirection) { 5636 } 5637 5638 /** 5639 * Returns a String representation of this set of layout parameters. 5640 * 5641 * @param output the String to prepend to the internal representation 5642 * @return a String with the following format: output + 5643 * "ViewGroup.LayoutParams={ width=WIDTH, height=HEIGHT }" 5644 * 5645 * @hide 5646 */ 5647 public String debug(String output) { 5648 return output + "ViewGroup.LayoutParams={ width=" 5649 + sizeToString(width) + ", height=" + sizeToString(height) + " }"; 5650 } 5651 5652 /** 5653 * Use {@code canvas} to draw suitable debugging annotations for these LayoutParameters. 5654 * 5655 * @param view the view that contains these layout parameters 5656 * @param canvas the canvas on which to draw 5657 * 5658 * @hide 5659 */ 5660 public void onDebugDraw(View view, Canvas canvas) { 5661 } 5662 5663 /** 5664 * Converts the specified size to a readable String. 5665 * 5666 * @param size the size to convert 5667 * @return a String instance representing the supplied size 5668 * 5669 * @hide 5670 */ 5671 protected static String sizeToString(int size) { 5672 if (size == WRAP_CONTENT) { 5673 return "wrap-content"; 5674 } 5675 if (size == MATCH_PARENT) { 5676 return "match-parent"; 5677 } 5678 return String.valueOf(size); 5679 } 5680 } 5681 5682 /** 5683 * Per-child layout information for layouts that support margins. 5684 * See 5685 * {@link android.R.styleable#ViewGroup_MarginLayout ViewGroup Margin Layout Attributes} 5686 * for a list of all child view attributes that this class supports. 5687 */ 5688 public static class MarginLayoutParams extends ViewGroup.LayoutParams { 5689 /** 5690 * The left margin in pixels of the child. 5691 * Call {@link ViewGroup#setLayoutParams(LayoutParams)} after reassigning a new value 5692 * to this field. 5693 */ 5694 @ViewDebug.ExportedProperty(category = "layout") 5695 public int leftMargin; 5696 5697 /** 5698 * The top margin in pixels of the child. 5699 * Call {@link ViewGroup#setLayoutParams(LayoutParams)} after reassigning a new value 5700 * to this field. 5701 */ 5702 @ViewDebug.ExportedProperty(category = "layout") 5703 public int topMargin; 5704 5705 /** 5706 * The right margin in pixels of the child. 5707 * Call {@link ViewGroup#setLayoutParams(LayoutParams)} after reassigning a new value 5708 * to this field. 5709 */ 5710 @ViewDebug.ExportedProperty(category = "layout") 5711 public int rightMargin; 5712 5713 /** 5714 * The bottom margin in pixels of the child. 5715 * Call {@link ViewGroup#setLayoutParams(LayoutParams)} after reassigning a new value 5716 * to this field. 5717 */ 5718 @ViewDebug.ExportedProperty(category = "layout") 5719 public int bottomMargin; 5720 5721 /** 5722 * The start margin in pixels of the child. 5723 * Call {@link ViewGroup#setLayoutParams(LayoutParams)} after reassigning a new value 5724 * to this field. 5725 */ 5726 @ViewDebug.ExportedProperty(category = "layout") 5727 private int startMargin = DEFAULT_RELATIVE; 5728 5729 /** 5730 * The end margin in pixels of the child. 5731 * Call {@link ViewGroup#setLayoutParams(LayoutParams)} after reassigning a new value 5732 * to this field. 5733 */ 5734 @ViewDebug.ExportedProperty(category = "layout") 5735 private int endMargin = DEFAULT_RELATIVE; 5736 5737 /** 5738 * The default start and end margin. 5739 * @hide 5740 */ 5741 public static final int DEFAULT_RELATIVE = Integer.MIN_VALUE; 5742 5743 private int initialLeftMargin; 5744 private int initialRightMargin; 5745 5746 private static int LAYOUT_DIRECTION_UNDEFINED = -1; 5747 5748 // Layout direction undefined by default 5749 private int layoutDirection = LAYOUT_DIRECTION_UNDEFINED; 5750 5751 /** 5752 * Creates a new set of layout parameters. The values are extracted from 5753 * the supplied attributes set and context. 5754 * 5755 * @param c the application environment 5756 * @param attrs the set of attributes from which to extract the layout 5757 * parameters' values 5758 */ 5759 public MarginLayoutParams(Context c, AttributeSet attrs) { 5760 super(); 5761 5762 TypedArray a = c.obtainStyledAttributes(attrs, R.styleable.ViewGroup_MarginLayout); 5763 setBaseAttributes(a, 5764 R.styleable.ViewGroup_MarginLayout_layout_width, 5765 R.styleable.ViewGroup_MarginLayout_layout_height); 5766 5767 int margin = a.getDimensionPixelSize( 5768 com.android.internal.R.styleable.ViewGroup_MarginLayout_layout_margin, -1); 5769 if (margin >= 0) { 5770 leftMargin = margin; 5771 topMargin = margin; 5772 rightMargin= margin; 5773 bottomMargin = margin; 5774 } else { 5775 leftMargin = a.getDimensionPixelSize( 5776 R.styleable.ViewGroup_MarginLayout_layout_marginLeft, 0); 5777 topMargin = a.getDimensionPixelSize( 5778 R.styleable.ViewGroup_MarginLayout_layout_marginTop, 0); 5779 rightMargin = a.getDimensionPixelSize( 5780 R.styleable.ViewGroup_MarginLayout_layout_marginRight, 0); 5781 bottomMargin = a.getDimensionPixelSize( 5782 R.styleable.ViewGroup_MarginLayout_layout_marginBottom, 0); 5783 startMargin = a.getDimensionPixelSize( 5784 R.styleable.ViewGroup_MarginLayout_layout_marginStart, DEFAULT_RELATIVE); 5785 endMargin = a.getDimensionPixelSize( 5786 R.styleable.ViewGroup_MarginLayout_layout_marginEnd, DEFAULT_RELATIVE); 5787 } 5788 5789 initialLeftMargin = leftMargin; 5790 initialRightMargin = rightMargin; 5791 5792 a.recycle(); 5793 } 5794 5795 /** 5796 * {@inheritDoc} 5797 */ 5798 public MarginLayoutParams(int width, int height) { 5799 super(width, height); 5800 } 5801 5802 /** 5803 * Copy constructor. Clones the width, height and margin values of the source. 5804 * 5805 * @param source The layout params to copy from. 5806 */ 5807 public MarginLayoutParams(MarginLayoutParams source) { 5808 this.width = source.width; 5809 this.height = source.height; 5810 5811 this.leftMargin = source.leftMargin; 5812 this.topMargin = source.topMargin; 5813 this.rightMargin = source.rightMargin; 5814 this.bottomMargin = source.bottomMargin; 5815 this.startMargin = source.startMargin; 5816 this.endMargin = source.endMargin; 5817 5818 this.initialLeftMargin = source.leftMargin; 5819 this.initialRightMargin = source.rightMargin; 5820 5821 setLayoutDirection(source.layoutDirection); 5822 } 5823 5824 /** 5825 * {@inheritDoc} 5826 */ 5827 public MarginLayoutParams(LayoutParams source) { 5828 super(source); 5829 } 5830 5831 /** 5832 * Sets the margins, in pixels. A call to {@link android.view.View#requestLayout()} needs 5833 * to be done so that the new margins are taken into account. Left and right margins may be 5834 * overriden by {@link android.view.View#requestLayout()} depending on layout direction. 5835 * 5836 * @param left the left margin size 5837 * @param top the top margin size 5838 * @param right the right margin size 5839 * @param bottom the bottom margin size 5840 * 5841 * @attr ref android.R.styleable#ViewGroup_MarginLayout_layout_marginLeft 5842 * @attr ref android.R.styleable#ViewGroup_MarginLayout_layout_marginTop 5843 * @attr ref android.R.styleable#ViewGroup_MarginLayout_layout_marginRight 5844 * @attr ref android.R.styleable#ViewGroup_MarginLayout_layout_marginBottom 5845 */ 5846 public void setMargins(int left, int top, int right, int bottom) { 5847 leftMargin = left; 5848 topMargin = top; 5849 rightMargin = right; 5850 bottomMargin = bottom; 5851 initialLeftMargin = left; 5852 initialRightMargin = right; 5853 } 5854 5855 /** 5856 * Sets the relative margins, in pixels. A call to {@link android.view.View#requestLayout()} 5857 * needs to be done so that the new relative margins are taken into account. Left and right 5858 * margins may be overriden by {@link android.view.View#requestLayout()} depending on layout 5859 * direction. 5860 * 5861 * @param start the start margin size 5862 * @param top the top margin size 5863 * @param end the right margin size 5864 * @param bottom the bottom margin size 5865 * 5866 * @attr ref android.R.styleable#ViewGroup_MarginLayout_layout_marginStart 5867 * @attr ref android.R.styleable#ViewGroup_MarginLayout_layout_marginTop 5868 * @attr ref android.R.styleable#ViewGroup_MarginLayout_layout_marginEnd 5869 * @attr ref android.R.styleable#ViewGroup_MarginLayout_layout_marginBottom 5870 * 5871 * @hide 5872 */ 5873 public void setMarginsRelative(int start, int top, int end, int bottom) { 5874 startMargin = start; 5875 topMargin = top; 5876 endMargin = end; 5877 bottomMargin = bottom; 5878 initialLeftMargin = 0; 5879 initialRightMargin = 0; 5880 } 5881 5882 /** 5883 * Sets the relative start margin. 5884 * 5885 * @param start the start margin size 5886 * 5887 * @attr ref android.R.styleable#ViewGroup_MarginLayout_layout_marginStart 5888 */ 5889 public void setMarginStart(int start) { 5890 startMargin = start; 5891 } 5892 5893 /** 5894 * Returns the start margin in pixels. 5895 * 5896 * @attr ref android.R.styleable#ViewGroup_MarginLayout_layout_marginStart 5897 * 5898 * @return the start margin in pixels. 5899 */ 5900 public int getMarginStart() { 5901 if (startMargin != DEFAULT_RELATIVE) return startMargin; 5902 switch(layoutDirection) { 5903 case View.LAYOUT_DIRECTION_RTL: 5904 return rightMargin; 5905 case View.LAYOUT_DIRECTION_LTR: 5906 default: 5907 return leftMargin; 5908 } 5909 } 5910 5911 /** 5912 * Sets the relative end margin. 5913 * 5914 * @param end the end margin size 5915 * 5916 * @attr ref android.R.styleable#ViewGroup_MarginLayout_layout_marginEnd 5917 */ 5918 public void setMarginEnd(int end) { 5919 endMargin = end; 5920 } 5921 5922 /** 5923 * Returns the end margin in pixels. 5924 * 5925 * @attr ref android.R.styleable#ViewGroup_MarginLayout_layout_marginEnd 5926 * 5927 * @return the end margin in pixels. 5928 */ 5929 public int getMarginEnd() { 5930 if (endMargin != DEFAULT_RELATIVE) return endMargin; 5931 switch(layoutDirection) { 5932 case View.LAYOUT_DIRECTION_RTL: 5933 return leftMargin; 5934 case View.LAYOUT_DIRECTION_LTR: 5935 default: 5936 return rightMargin; 5937 } 5938 } 5939 5940 /** 5941 * Check if margins are relative. 5942 * 5943 * @attr ref android.R.styleable#ViewGroup_MarginLayout_layout_marginStart 5944 * @attr ref android.R.styleable#ViewGroup_MarginLayout_layout_marginEnd 5945 * 5946 * @return true if either marginStart or marginEnd has been set. 5947 */ 5948 public boolean isMarginRelative() { 5949 return (startMargin != DEFAULT_RELATIVE) || (endMargin != DEFAULT_RELATIVE); 5950 } 5951 5952 /** 5953 * Set the layout direction 5954 * @param layoutDirection the layout direction. 5955 * Should be either {@link View#LAYOUT_DIRECTION_LTR} 5956 * or {@link View#LAYOUT_DIRECTION_RTL}. 5957 */ 5958 public void setLayoutDirection(int layoutDirection) { 5959 if (layoutDirection != View.LAYOUT_DIRECTION_LTR && 5960 layoutDirection != View.LAYOUT_DIRECTION_RTL) return; 5961 this.layoutDirection = layoutDirection; 5962 } 5963 5964 /** 5965 * Retuns the layout direction. Can be either {@link View#LAYOUT_DIRECTION_LTR} or 5966 * {@link View#LAYOUT_DIRECTION_RTL}. 5967 * 5968 * @return the layout direction. 5969 */ 5970 public int getLayoutDirection() { 5971 return layoutDirection; 5972 } 5973 5974 /** 5975 * This will be called by {@link android.view.View#requestLayout()}. Left and Right margins 5976 * may be overridden depending on layout direction. 5977 */ 5978 @Override 5979 public void resolveLayoutDirection(int layoutDirection) { 5980 setLayoutDirection(layoutDirection); 5981 5982 if (!isMarginRelative()) return; 5983 5984 switch(layoutDirection) { 5985 case View.LAYOUT_DIRECTION_RTL: 5986 leftMargin = (endMargin > DEFAULT_RELATIVE) ? endMargin : initialLeftMargin; 5987 rightMargin = (startMargin > DEFAULT_RELATIVE) ? startMargin : initialRightMargin; 5988 break; 5989 case View.LAYOUT_DIRECTION_LTR: 5990 default: 5991 leftMargin = (startMargin > DEFAULT_RELATIVE) ? startMargin : initialLeftMargin; 5992 rightMargin = (endMargin > DEFAULT_RELATIVE) ? endMargin : initialRightMargin; 5993 break; 5994 } 5995 } 5996 5997 /** 5998 * @hide 5999 */ 6000 public boolean isLayoutRtl() { 6001 return (layoutDirection == View.LAYOUT_DIRECTION_RTL); 6002 } 6003 6004 /** 6005 * @hide 6006 */ 6007 @Override 6008 public void onDebugDraw(View view, Canvas canvas) { 6009 drawRect(canvas, 6010 view.getLeft() - leftMargin, 6011 view.getTop() - topMargin, 6012 view.getRight() + rightMargin, 6013 view.getBottom() + bottomMargin, Color.MAGENTA); 6014 } 6015 } 6016 6017 /* Describes a touched view and the ids of the pointers that it has captured. 6018 * 6019 * This code assumes that pointer ids are always in the range 0..31 such that 6020 * it can use a bitfield to track which pointer ids are present. 6021 * As it happens, the lower layers of the input dispatch pipeline also use the 6022 * same trick so the assumption should be safe here... 6023 */ 6024 private static final class TouchTarget { 6025 private static final int MAX_RECYCLED = 32; 6026 private static final Object sRecycleLock = new Object(); 6027 private static TouchTarget sRecycleBin; 6028 private static int sRecycledCount; 6029 6030 public static final int ALL_POINTER_IDS = -1; // all ones 6031 6032 // The touched child view. 6033 public View child; 6034 6035 // The combined bit mask of pointer ids for all pointers captured by the target. 6036 public int pointerIdBits; 6037 6038 // The next target in the target list. 6039 public TouchTarget next; 6040 6041 private TouchTarget() { 6042 } 6043 6044 public static TouchTarget obtain(View child, int pointerIdBits) { 6045 final TouchTarget target; 6046 synchronized (sRecycleLock) { 6047 if (sRecycleBin == null) { 6048 target = new TouchTarget(); 6049 } else { 6050 target = sRecycleBin; 6051 sRecycleBin = target.next; 6052 sRecycledCount--; 6053 target.next = null; 6054 } 6055 } 6056 target.child = child; 6057 target.pointerIdBits = pointerIdBits; 6058 return target; 6059 } 6060 6061 public void recycle() { 6062 synchronized (sRecycleLock) { 6063 if (sRecycledCount < MAX_RECYCLED) { 6064 next = sRecycleBin; 6065 sRecycleBin = this; 6066 sRecycledCount += 1; 6067 } else { 6068 next = null; 6069 } 6070 child = null; 6071 } 6072 } 6073 } 6074 6075 /* Describes a hovered view. */ 6076 private static final class HoverTarget { 6077 private static final int MAX_RECYCLED = 32; 6078 private static final Object sRecycleLock = new Object(); 6079 private static HoverTarget sRecycleBin; 6080 private static int sRecycledCount; 6081 6082 // The hovered child view. 6083 public View child; 6084 6085 // The next target in the target list. 6086 public HoverTarget next; 6087 6088 private HoverTarget() { 6089 } 6090 6091 public static HoverTarget obtain(View child) { 6092 final HoverTarget target; 6093 synchronized (sRecycleLock) { 6094 if (sRecycleBin == null) { 6095 target = new HoverTarget(); 6096 } else { 6097 target = sRecycleBin; 6098 sRecycleBin = target.next; 6099 sRecycledCount--; 6100 target.next = null; 6101 } 6102 } 6103 target.child = child; 6104 return target; 6105 } 6106 6107 public void recycle() { 6108 synchronized (sRecycleLock) { 6109 if (sRecycledCount < MAX_RECYCLED) { 6110 next = sRecycleBin; 6111 sRecycleBin = this; 6112 sRecycledCount += 1; 6113 } else { 6114 next = null; 6115 } 6116 child = null; 6117 } 6118 } 6119 } 6120 6121 /** 6122 * Pooled class that orderes the children of a ViewGroup from start 6123 * to end based on how they are laid out and the layout direction. 6124 */ 6125 static class ChildListForAccessibility { 6126 6127 private static final int MAX_POOL_SIZE = 32; 6128 6129 private static final Object sPoolLock = new Object(); 6130 6131 private static ChildListForAccessibility sPool; 6132 6133 private static int sPoolSize; 6134 6135 private boolean mIsPooled; 6136 6137 private ChildListForAccessibility mNext; 6138 6139 private final ArrayList<View> mChildren = new ArrayList<View>(); 6140 6141 private final ArrayList<ViewLocationHolder> mHolders = new ArrayList<ViewLocationHolder>(); 6142 6143 public static ChildListForAccessibility obtain(ViewGroup parent, boolean sort) { 6144 ChildListForAccessibility list = null; 6145 synchronized (sPoolLock) { 6146 if (sPool != null) { 6147 list = sPool; 6148 sPool = list.mNext; 6149 list.mNext = null; 6150 list.mIsPooled = false; 6151 sPoolSize--; 6152 } else { 6153 list = new ChildListForAccessibility(); 6154 } 6155 list.init(parent, sort); 6156 return list; 6157 } 6158 } 6159 6160 public void recycle() { 6161 if (mIsPooled) { 6162 throw new IllegalStateException("Instance already recycled."); 6163 } 6164 clear(); 6165 synchronized (sPoolLock) { 6166 if (sPoolSize < MAX_POOL_SIZE) { 6167 mNext = sPool; 6168 mIsPooled = true; 6169 sPool = this; 6170 sPoolSize++; 6171 } 6172 } 6173 } 6174 6175 public int getChildCount() { 6176 return mChildren.size(); 6177 } 6178 6179 public View getChildAt(int index) { 6180 return mChildren.get(index); 6181 } 6182 6183 public int getChildIndex(View child) { 6184 return mChildren.indexOf(child); 6185 } 6186 6187 private void init(ViewGroup parent, boolean sort) { 6188 ArrayList<View> children = mChildren; 6189 final int childCount = parent.getChildCount(); 6190 for (int i = 0; i < childCount; i++) { 6191 View child = parent.getChildAt(i); 6192 children.add(child); 6193 } 6194 if (sort) { 6195 ArrayList<ViewLocationHolder> holders = mHolders; 6196 for (int i = 0; i < childCount; i++) { 6197 View child = children.get(i); 6198 ViewLocationHolder holder = ViewLocationHolder.obtain(parent, child); 6199 holders.add(holder); 6200 } 6201 Collections.sort(holders); 6202 for (int i = 0; i < childCount; i++) { 6203 ViewLocationHolder holder = holders.get(i); 6204 children.set(i, holder.mView); 6205 holder.recycle(); 6206 } 6207 holders.clear(); 6208 } 6209 } 6210 6211 private void clear() { 6212 mChildren.clear(); 6213 } 6214 } 6215 6216 /** 6217 * Pooled class that holds a View and its location with respect to 6218 * a specified root. This enables sorting of views based on their 6219 * coordinates without recomputing the position relative to the root 6220 * on every comparison. 6221 */ 6222 static class ViewLocationHolder implements Comparable<ViewLocationHolder> { 6223 6224 private static final int MAX_POOL_SIZE = 32; 6225 6226 private static final Object sPoolLock = new Object(); 6227 6228 private static ViewLocationHolder sPool; 6229 6230 private static int sPoolSize; 6231 6232 private boolean mIsPooled; 6233 6234 private ViewLocationHolder mNext; 6235 6236 private final Rect mLocation = new Rect(); 6237 6238 public View mView; 6239 6240 private int mLayoutDirection; 6241 6242 public static ViewLocationHolder obtain(ViewGroup root, View view) { 6243 ViewLocationHolder holder = null; 6244 synchronized (sPoolLock) { 6245 if (sPool != null) { 6246 holder = sPool; 6247 sPool = holder.mNext; 6248 holder.mNext = null; 6249 holder.mIsPooled = false; 6250 sPoolSize--; 6251 } else { 6252 holder = new ViewLocationHolder(); 6253 } 6254 holder.init(root, view); 6255 return holder; 6256 } 6257 } 6258 6259 public void recycle() { 6260 if (mIsPooled) { 6261 throw new IllegalStateException("Instance already recycled."); 6262 } 6263 clear(); 6264 synchronized (sPoolLock) { 6265 if (sPoolSize < MAX_POOL_SIZE) { 6266 mNext = sPool; 6267 mIsPooled = true; 6268 sPool = this; 6269 sPoolSize++; 6270 } 6271 } 6272 } 6273 6274 @Override 6275 public int compareTo(ViewLocationHolder another) { 6276 // This instance is greater than an invalid argument. 6277 if (another == null) { 6278 return 1; 6279 } 6280 if (getClass() != another.getClass()) { 6281 return 1; 6282 } 6283 // First is above second. 6284 if (mLocation.bottom - another.mLocation.top <= 0) { 6285 return -1; 6286 } 6287 // First is below second. 6288 if (mLocation.top - another.mLocation.bottom >= 0) { 6289 return 1; 6290 } 6291 // LTR 6292 if (mLayoutDirection == LAYOUT_DIRECTION_LTR) { 6293 final int leftDifference = mLocation.left - another.mLocation.left; 6294 // First more to the left than second. 6295 if (leftDifference != 0) { 6296 return leftDifference; 6297 } 6298 } else { // RTL 6299 final int rightDifference = mLocation.right - another.mLocation.right; 6300 // First more to the right than second. 6301 if (rightDifference != 0) { 6302 return -rightDifference; 6303 } 6304 } 6305 // Break tie by top. 6306 final int topDiference = mLocation.top - another.mLocation.top; 6307 if (topDiference != 0) { 6308 return topDiference; 6309 } 6310 // Break tie by height. 6311 final int heightDiference = mLocation.height() - another.mLocation.height(); 6312 if (heightDiference != 0) { 6313 return -heightDiference; 6314 } 6315 // Break tie by width. 6316 final int widthDiference = mLocation.width() - another.mLocation.width(); 6317 if (widthDiference != 0) { 6318 return -widthDiference; 6319 } 6320 // Just break the tie somehow. The accessibliity ids are unique 6321 // and stable, hence this is deterministic tie breaking. 6322 return mView.getAccessibilityViewId() - another.mView.getAccessibilityViewId(); 6323 } 6324 6325 private void init(ViewGroup root, View view) { 6326 Rect viewLocation = mLocation; 6327 view.getDrawingRect(viewLocation); 6328 root.offsetDescendantRectToMyCoords(view, viewLocation); 6329 mView = view; 6330 mLayoutDirection = root.getLayoutDirection(); 6331 } 6332 6333 private void clear() { 6334 mView = null; 6335 mLocation.set(0, 0, 0, 0); 6336 } 6337 } 6338 6339 private static Paint getDebugPaint() { 6340 if (sDebugPaint == null) { 6341 sDebugPaint = new Paint(); 6342 sDebugPaint.setAntiAlias(false); 6343 } 6344 return sDebugPaint; 6345 } 6346 6347 private static float[] getDebugLines(int x1, int y1, int x2, int y2) { 6348 if (sDebugLines== null) { 6349 sDebugLines = new float[16]; 6350 } 6351 6352 x2--; 6353 y2--; 6354 6355 sDebugLines[0] = x1; 6356 sDebugLines[1] = y1; 6357 sDebugLines[2] = x2; 6358 sDebugLines[3] = y1; 6359 6360 sDebugLines[4] = x2; 6361 sDebugLines[5] = y1; 6362 sDebugLines[6] = x2; 6363 sDebugLines[7] = y2 + 1; 6364 6365 sDebugLines[8] = x2 + 1; 6366 sDebugLines[9] = y2; 6367 sDebugLines[10] = x1; 6368 sDebugLines[11] = y2; 6369 6370 sDebugLines[12] = x1; 6371 sDebugLines[13] = y2; 6372 sDebugLines[14] = x1; 6373 sDebugLines[15] = y1; 6374 6375 return sDebugLines; 6376 } 6377} 6378