ViewGroup.java revision 8a7259bdc2bd70b7d26998b1c552ab45e69cebb1
1/* 2 * Copyright (C) 2006 The Android Open Source Project 3 * 4 * Licensed under the Apache License, Version 2.0 (the "License"); 5 * you may not use this file except in compliance with the License. 6 * You may obtain a copy of the License at 7 * 8 * http://www.apache.org/licenses/LICENSE-2.0 9 * 10 * Unless required by applicable law or agreed to in writing, software 11 * distributed under the License is distributed on an "AS IS" BASIS, 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 13 * See the License for the specific language governing permissions and 14 * limitations under the License. 15 */ 16 17package android.view; 18 19import android.animation.LayoutTransition; 20import android.content.Context; 21import android.content.res.Configuration; 22import android.content.res.TypedArray; 23import android.graphics.Bitmap; 24import android.graphics.Canvas; 25import android.graphics.Matrix; 26import android.graphics.Paint; 27import android.graphics.PointF; 28import android.graphics.Rect; 29import android.graphics.RectF; 30import android.graphics.Region; 31import android.os.Build; 32import android.os.Parcelable; 33import android.os.SystemClock; 34import android.util.AttributeSet; 35import android.util.Log; 36import android.util.SparseArray; 37import android.view.accessibility.AccessibilityEvent; 38import android.view.accessibility.AccessibilityNodeInfo; 39import android.view.animation.Animation; 40import android.view.animation.AnimationUtils; 41import android.view.animation.LayoutAnimationController; 42import android.view.animation.Transformation; 43 44import com.android.internal.R; 45import com.android.internal.util.Predicate; 46 47import java.util.ArrayList; 48import java.util.HashSet; 49 50/** 51 * <p> 52 * A <code>ViewGroup</code> is a special view that can contain other views 53 * (called children.) The view group is the base class for layouts and views 54 * containers. This class also defines the 55 * {@link android.view.ViewGroup.LayoutParams} class which serves as the base 56 * class for layouts parameters. 57 * </p> 58 * 59 * <p> 60 * Also see {@link LayoutParams} for layout attributes. 61 * </p> 62 * 63 * <div class="special reference"> 64 * <h3>Developer Guides</h3> 65 * <p>For more information about creating user interface layouts, read the 66 * <a href="{@docRoot}guide/topics/ui/declaring-layout.html">XML Layouts</a> developer 67 * guide.</p></div> 68 * 69 * @attr ref android.R.styleable#ViewGroup_clipChildren 70 * @attr ref android.R.styleable#ViewGroup_clipToPadding 71 * @attr ref android.R.styleable#ViewGroup_layoutAnimation 72 * @attr ref android.R.styleable#ViewGroup_animationCache 73 * @attr ref android.R.styleable#ViewGroup_persistentDrawingCache 74 * @attr ref android.R.styleable#ViewGroup_alwaysDrawnWithCache 75 * @attr ref android.R.styleable#ViewGroup_addStatesFromChildren 76 * @attr ref android.R.styleable#ViewGroup_descendantFocusability 77 * @attr ref android.R.styleable#ViewGroup_animateLayoutChanges 78 */ 79public abstract class ViewGroup extends View implements ViewParent, ViewManager { 80 private static final String TAG = "ViewGroup"; 81 82 private static final boolean DBG = false; 83 84 /** 85 * Views which have been hidden or removed which need to be animated on 86 * their way out. 87 * This field should be made private, so it is hidden from the SDK. 88 * {@hide} 89 */ 90 protected ArrayList<View> mDisappearingChildren; 91 92 /** 93 * Listener used to propagate events indicating when children are added 94 * and/or removed from a view group. 95 * This field should be made private, so it is hidden from the SDK. 96 * {@hide} 97 */ 98 protected OnHierarchyChangeListener mOnHierarchyChangeListener; 99 100 // The view contained within this ViewGroup that has or contains focus. 101 private View mFocused; 102 103 /** 104 * A Transformation used when drawing children, to 105 * apply on the child being drawn. 106 */ 107 final Transformation mChildTransformation = new Transformation(); 108 109 /** 110 * Used to track the current invalidation region. 111 */ 112 RectF mInvalidateRegion; 113 114 /** 115 * A Transformation used to calculate a correct 116 * invalidation area when the application is autoscaled. 117 */ 118 Transformation mInvalidationTransformation; 119 120 // View currently under an ongoing drag 121 private View mCurrentDragView; 122 123 // Metadata about the ongoing drag 124 private DragEvent mCurrentDrag; 125 private HashSet<View> mDragNotifiedChildren; 126 127 // Does this group have a child that can accept the current drag payload? 128 private boolean mChildAcceptsDrag; 129 130 // Used during drag dispatch 131 private final PointF mLocalPoint = new PointF(); 132 133 // Layout animation 134 private LayoutAnimationController mLayoutAnimationController; 135 private Animation.AnimationListener mAnimationListener; 136 137 // First touch target in the linked list of touch targets. 138 private TouchTarget mFirstTouchTarget; 139 140 // For debugging only. You can see these in hierarchyviewer. 141 @SuppressWarnings({"FieldCanBeLocal", "UnusedDeclaration"}) 142 @ViewDebug.ExportedProperty(category = "events") 143 private long mLastTouchDownTime; 144 @ViewDebug.ExportedProperty(category = "events") 145 private int mLastTouchDownIndex = -1; 146 @SuppressWarnings({"FieldCanBeLocal", "UnusedDeclaration"}) 147 @ViewDebug.ExportedProperty(category = "events") 148 private float mLastTouchDownX; 149 @SuppressWarnings({"FieldCanBeLocal", "UnusedDeclaration"}) 150 @ViewDebug.ExportedProperty(category = "events") 151 private float mLastTouchDownY; 152 153 // First hover target in the linked list of hover targets. 154 // The hover targets are children which have received ACTION_HOVER_ENTER. 155 // They might not have actually handled the hover event, but we will 156 // continue sending hover events to them as long as the pointer remains over 157 // their bounds and the view group does not intercept hover. 158 private HoverTarget mFirstHoverTarget; 159 160 // True if the view group itself received a hover event. 161 // It might not have actually handled the hover event. 162 private boolean mHoveredSelf; 163 164 /** 165 * Internal flags. 166 * 167 * This field should be made private, so it is hidden from the SDK. 168 * {@hide} 169 */ 170 protected int mGroupFlags; 171 172 /** 173 * NOTE: If you change the flags below make sure to reflect the changes 174 * the DisplayList class 175 */ 176 177 // When set, ViewGroup invalidates only the child's rectangle 178 // Set by default 179 static final int FLAG_CLIP_CHILDREN = 0x1; 180 181 // When set, ViewGroup excludes the padding area from the invalidate rectangle 182 // Set by default 183 private static final int FLAG_CLIP_TO_PADDING = 0x2; 184 185 // When set, dispatchDraw() will invoke invalidate(); this is set by drawChild() when 186 // a child needs to be invalidated and FLAG_OPTIMIZE_INVALIDATE is set 187 static final int FLAG_INVALIDATE_REQUIRED = 0x4; 188 189 // When set, dispatchDraw() will run the layout animation and unset the flag 190 private static final int FLAG_RUN_ANIMATION = 0x8; 191 192 // When set, there is either no layout animation on the ViewGroup or the layout 193 // animation is over 194 // Set by default 195 static final int FLAG_ANIMATION_DONE = 0x10; 196 197 // If set, this ViewGroup has padding; if unset there is no padding and we don't need 198 // to clip it, even if FLAG_CLIP_TO_PADDING is set 199 private static final int FLAG_PADDING_NOT_NULL = 0x20; 200 201 // When set, this ViewGroup caches its children in a Bitmap before starting a layout animation 202 // Set by default 203 private static final int FLAG_ANIMATION_CACHE = 0x40; 204 205 // When set, this ViewGroup converts calls to invalidate(Rect) to invalidate() during a 206 // layout animation; this avoid clobbering the hierarchy 207 // Automatically set when the layout animation starts, depending on the animation's 208 // characteristics 209 static final int FLAG_OPTIMIZE_INVALIDATE = 0x80; 210 211 // When set, the next call to drawChild() will clear mChildTransformation's matrix 212 static final int FLAG_CLEAR_TRANSFORMATION = 0x100; 213 214 // When set, this ViewGroup invokes mAnimationListener.onAnimationEnd() and removes 215 // the children's Bitmap caches if necessary 216 // This flag is set when the layout animation is over (after FLAG_ANIMATION_DONE is set) 217 private static final int FLAG_NOTIFY_ANIMATION_LISTENER = 0x200; 218 219 /** 220 * When set, the drawing method will call {@link #getChildDrawingOrder(int, int)} 221 * to get the index of the child to draw for that iteration. 222 * 223 * @hide 224 */ 225 protected static final int FLAG_USE_CHILD_DRAWING_ORDER = 0x400; 226 227 /** 228 * When set, this ViewGroup supports static transformations on children; this causes 229 * {@link #getChildStaticTransformation(View, android.view.animation.Transformation)} to be 230 * invoked when a child is drawn. 231 * 232 * Any subclass overriding 233 * {@link #getChildStaticTransformation(View, android.view.animation.Transformation)} should 234 * set this flags in {@link #mGroupFlags}. 235 * 236 * {@hide} 237 */ 238 protected static final int FLAG_SUPPORT_STATIC_TRANSFORMATIONS = 0x800; 239 240 // When the previous drawChild() invocation used an alpha value that was lower than 241 // 1.0 and set it in mCachePaint 242 static final int FLAG_ALPHA_LOWER_THAN_ONE = 0x1000; 243 244 /** 245 * When set, this ViewGroup's drawable states also include those 246 * of its children. 247 */ 248 private static final int FLAG_ADD_STATES_FROM_CHILDREN = 0x2000; 249 250 /** 251 * When set, this ViewGroup tries to always draw its children using their drawing cache. 252 */ 253 static final int FLAG_ALWAYS_DRAWN_WITH_CACHE = 0x4000; 254 255 /** 256 * When set, and if FLAG_ALWAYS_DRAWN_WITH_CACHE is not set, this ViewGroup will try to 257 * draw its children with their drawing cache. 258 */ 259 static final int FLAG_CHILDREN_DRAWN_WITH_CACHE = 0x8000; 260 261 /** 262 * When set, this group will go through its list of children to notify them of 263 * any drawable state change. 264 */ 265 private static final int FLAG_NOTIFY_CHILDREN_ON_DRAWABLE_STATE_CHANGE = 0x10000; 266 267 private static final int FLAG_MASK_FOCUSABILITY = 0x60000; 268 269 /** 270 * This view will get focus before any of its descendants. 271 */ 272 public static final int FOCUS_BEFORE_DESCENDANTS = 0x20000; 273 274 /** 275 * This view will get focus only if none of its descendants want it. 276 */ 277 public static final int FOCUS_AFTER_DESCENDANTS = 0x40000; 278 279 /** 280 * This view will block any of its descendants from getting focus, even 281 * if they are focusable. 282 */ 283 public static final int FOCUS_BLOCK_DESCENDANTS = 0x60000; 284 285 /** 286 * Used to map between enum in attrubutes and flag values. 287 */ 288 private static final int[] DESCENDANT_FOCUSABILITY_FLAGS = 289 {FOCUS_BEFORE_DESCENDANTS, FOCUS_AFTER_DESCENDANTS, 290 FOCUS_BLOCK_DESCENDANTS}; 291 292 /** 293 * When set, this ViewGroup should not intercept touch events. 294 * {@hide} 295 */ 296 protected static final int FLAG_DISALLOW_INTERCEPT = 0x80000; 297 298 /** 299 * When set, this ViewGroup will split MotionEvents to multiple child Views when appropriate. 300 */ 301 private static final int FLAG_SPLIT_MOTION_EVENTS = 0x200000; 302 303 /** 304 * When set, this ViewGroup will not dispatch onAttachedToWindow calls 305 * to children when adding new views. This is used to prevent multiple 306 * onAttached calls when a ViewGroup adds children in its own onAttached method. 307 */ 308 private static final int FLAG_PREVENT_DISPATCH_ATTACHED_TO_WINDOW = 0x400000; 309 310 /** 311 * Indicates which types of drawing caches are to be kept in memory. 312 * This field should be made private, so it is hidden from the SDK. 313 * {@hide} 314 */ 315 protected int mPersistentDrawingCache; 316 317 /** 318 * Used to indicate that no drawing cache should be kept in memory. 319 */ 320 public static final int PERSISTENT_NO_CACHE = 0x0; 321 322 /** 323 * Used to indicate that the animation drawing cache should be kept in memory. 324 */ 325 public static final int PERSISTENT_ANIMATION_CACHE = 0x1; 326 327 /** 328 * Used to indicate that the scrolling drawing cache should be kept in memory. 329 */ 330 public static final int PERSISTENT_SCROLLING_CACHE = 0x2; 331 332 /** 333 * Used to indicate that all drawing caches should be kept in memory. 334 */ 335 public static final int PERSISTENT_ALL_CACHES = 0x3; 336 337 /** 338 * We clip to padding when FLAG_CLIP_TO_PADDING and FLAG_PADDING_NOT_NULL 339 * are set at the same time. 340 */ 341 protected static final int CLIP_TO_PADDING_MASK = FLAG_CLIP_TO_PADDING | FLAG_PADDING_NOT_NULL; 342 343 // Index of the child's left position in the mLocation array 344 private static final int CHILD_LEFT_INDEX = 0; 345 // Index of the child's top position in the mLocation array 346 private static final int CHILD_TOP_INDEX = 1; 347 348 // Child views of this ViewGroup 349 private View[] mChildren; 350 // Number of valid children in the mChildren array, the rest should be null or not 351 // considered as children 352 353 private boolean mLayoutSuppressed = false; 354 355 private int mChildrenCount; 356 357 private static final int ARRAY_INITIAL_CAPACITY = 12; 358 private static final int ARRAY_CAPACITY_INCREMENT = 12; 359 360 // Used to draw cached views 361 Paint mCachePaint; 362 363 // Used to animate add/remove changes in layout 364 private LayoutTransition mTransition; 365 366 // The set of views that are currently being transitioned. This list is used to track views 367 // being removed that should not actually be removed from the parent yet because they are 368 // being animated. 369 private ArrayList<View> mTransitioningViews; 370 371 // List of children changing visibility. This is used to potentially keep rendering 372 // views during a transition when they otherwise would have become gone/invisible 373 private ArrayList<View> mVisibilityChangingChildren; 374 375 // Indicates whether this container will use its children layers to draw 376 @ViewDebug.ExportedProperty(category = "drawing") 377 boolean mDrawLayers = true; 378 379 // Indicates how many of this container's child subtrees contain transient state 380 @ViewDebug.ExportedProperty(category = "layout") 381 private int mChildCountWithTransientState = 0; 382 383 public ViewGroup(Context context) { 384 super(context); 385 initViewGroup(); 386 } 387 388 public ViewGroup(Context context, AttributeSet attrs) { 389 super(context, attrs); 390 initViewGroup(); 391 initFromAttributes(context, attrs); 392 } 393 394 public ViewGroup(Context context, AttributeSet attrs, int defStyle) { 395 super(context, attrs, defStyle); 396 initViewGroup(); 397 initFromAttributes(context, attrs); 398 } 399 400 private void initViewGroup() { 401 // ViewGroup doesn't draw by default 402 setFlags(WILL_NOT_DRAW, DRAW_MASK); 403 mGroupFlags |= FLAG_CLIP_CHILDREN; 404 mGroupFlags |= FLAG_CLIP_TO_PADDING; 405 mGroupFlags |= FLAG_ANIMATION_DONE; 406 mGroupFlags |= FLAG_ANIMATION_CACHE; 407 mGroupFlags |= FLAG_ALWAYS_DRAWN_WITH_CACHE; 408 409 if (mContext.getApplicationInfo().targetSdkVersion >= Build.VERSION_CODES.HONEYCOMB) { 410 mGroupFlags |= FLAG_SPLIT_MOTION_EVENTS; 411 } 412 413 setDescendantFocusability(FOCUS_BEFORE_DESCENDANTS); 414 415 mChildren = new View[ARRAY_INITIAL_CAPACITY]; 416 mChildrenCount = 0; 417 418 mPersistentDrawingCache = PERSISTENT_SCROLLING_CACHE; 419 } 420 421 private void initFromAttributes(Context context, AttributeSet attrs) { 422 TypedArray a = context.obtainStyledAttributes(attrs, 423 R.styleable.ViewGroup); 424 425 final int N = a.getIndexCount(); 426 for (int i = 0; i < N; i++) { 427 int attr = a.getIndex(i); 428 switch (attr) { 429 case R.styleable.ViewGroup_clipChildren: 430 setClipChildren(a.getBoolean(attr, true)); 431 break; 432 case R.styleable.ViewGroup_clipToPadding: 433 setClipToPadding(a.getBoolean(attr, true)); 434 break; 435 case R.styleable.ViewGroup_animationCache: 436 setAnimationCacheEnabled(a.getBoolean(attr, true)); 437 break; 438 case R.styleable.ViewGroup_persistentDrawingCache: 439 setPersistentDrawingCache(a.getInt(attr, PERSISTENT_SCROLLING_CACHE)); 440 break; 441 case R.styleable.ViewGroup_addStatesFromChildren: 442 setAddStatesFromChildren(a.getBoolean(attr, false)); 443 break; 444 case R.styleable.ViewGroup_alwaysDrawnWithCache: 445 setAlwaysDrawnWithCacheEnabled(a.getBoolean(attr, true)); 446 break; 447 case R.styleable.ViewGroup_layoutAnimation: 448 int id = a.getResourceId(attr, -1); 449 if (id > 0) { 450 setLayoutAnimation(AnimationUtils.loadLayoutAnimation(mContext, id)); 451 } 452 break; 453 case R.styleable.ViewGroup_descendantFocusability: 454 setDescendantFocusability(DESCENDANT_FOCUSABILITY_FLAGS[a.getInt(attr, 0)]); 455 break; 456 case R.styleable.ViewGroup_splitMotionEvents: 457 setMotionEventSplittingEnabled(a.getBoolean(attr, false)); 458 break; 459 case R.styleable.ViewGroup_animateLayoutChanges: 460 boolean animateLayoutChanges = a.getBoolean(attr, false); 461 if (animateLayoutChanges) { 462 setLayoutTransition(new LayoutTransition()); 463 } 464 break; 465 } 466 } 467 468 a.recycle(); 469 } 470 471 /** 472 * Gets the descendant focusability of this view group. The descendant 473 * focusability defines the relationship between this view group and its 474 * descendants when looking for a view to take focus in 475 * {@link #requestFocus(int, android.graphics.Rect)}. 476 * 477 * @return one of {@link #FOCUS_BEFORE_DESCENDANTS}, {@link #FOCUS_AFTER_DESCENDANTS}, 478 * {@link #FOCUS_BLOCK_DESCENDANTS}. 479 */ 480 @ViewDebug.ExportedProperty(category = "focus", mapping = { 481 @ViewDebug.IntToString(from = FOCUS_BEFORE_DESCENDANTS, to = "FOCUS_BEFORE_DESCENDANTS"), 482 @ViewDebug.IntToString(from = FOCUS_AFTER_DESCENDANTS, to = "FOCUS_AFTER_DESCENDANTS"), 483 @ViewDebug.IntToString(from = FOCUS_BLOCK_DESCENDANTS, to = "FOCUS_BLOCK_DESCENDANTS") 484 }) 485 public int getDescendantFocusability() { 486 return mGroupFlags & FLAG_MASK_FOCUSABILITY; 487 } 488 489 /** 490 * Set the descendant focusability of this view group. This defines the relationship 491 * between this view group and its descendants when looking for a view to 492 * take focus in {@link #requestFocus(int, android.graphics.Rect)}. 493 * 494 * @param focusability one of {@link #FOCUS_BEFORE_DESCENDANTS}, {@link #FOCUS_AFTER_DESCENDANTS}, 495 * {@link #FOCUS_BLOCK_DESCENDANTS}. 496 */ 497 public void setDescendantFocusability(int focusability) { 498 switch (focusability) { 499 case FOCUS_BEFORE_DESCENDANTS: 500 case FOCUS_AFTER_DESCENDANTS: 501 case FOCUS_BLOCK_DESCENDANTS: 502 break; 503 default: 504 throw new IllegalArgumentException("must be one of FOCUS_BEFORE_DESCENDANTS, " 505 + "FOCUS_AFTER_DESCENDANTS, FOCUS_BLOCK_DESCENDANTS"); 506 } 507 mGroupFlags &= ~FLAG_MASK_FOCUSABILITY; 508 mGroupFlags |= (focusability & FLAG_MASK_FOCUSABILITY); 509 } 510 511 /** 512 * {@inheritDoc} 513 */ 514 @Override 515 void handleFocusGainInternal(int direction, Rect previouslyFocusedRect) { 516 if (mFocused != null) { 517 mFocused.unFocus(); 518 mFocused = null; 519 } 520 super.handleFocusGainInternal(direction, previouslyFocusedRect); 521 } 522 523 /** 524 * {@inheritDoc} 525 */ 526 public void requestChildFocus(View child, View focused) { 527 if (DBG) { 528 System.out.println(this + " requestChildFocus()"); 529 } 530 if (getDescendantFocusability() == FOCUS_BLOCK_DESCENDANTS) { 531 return; 532 } 533 534 // Unfocus us, if necessary 535 super.unFocus(); 536 537 // We had a previous notion of who had focus. Clear it. 538 if (mFocused != child) { 539 if (mFocused != null) { 540 mFocused.unFocus(); 541 } 542 543 mFocused = child; 544 } 545 if (mParent != null) { 546 mParent.requestChildFocus(this, focused); 547 } 548 } 549 550 /** 551 * {@inheritDoc} 552 */ 553 public void focusableViewAvailable(View v) { 554 if (mParent != null 555 // shortcut: don't report a new focusable view if we block our descendants from 556 // getting focus 557 && (getDescendantFocusability() != FOCUS_BLOCK_DESCENDANTS) 558 // shortcut: don't report a new focusable view if we already are focused 559 // (and we don't prefer our descendants) 560 // 561 // note: knowing that mFocused is non-null is not a good enough reason 562 // to break the traversal since in that case we'd actually have to find 563 // the focused view and make sure it wasn't FOCUS_AFTER_DESCENDANTS and 564 // an ancestor of v; this will get checked for at ViewAncestor 565 && !(isFocused() && getDescendantFocusability() != FOCUS_AFTER_DESCENDANTS)) { 566 mParent.focusableViewAvailable(v); 567 } 568 } 569 570 /** 571 * {@inheritDoc} 572 */ 573 public boolean showContextMenuForChild(View originalView) { 574 return mParent != null && mParent.showContextMenuForChild(originalView); 575 } 576 577 /** 578 * {@inheritDoc} 579 */ 580 public ActionMode startActionModeForChild(View originalView, ActionMode.Callback callback) { 581 return mParent != null ? mParent.startActionModeForChild(originalView, callback) : null; 582 } 583 584 /** 585 * Find the nearest view in the specified direction that wants to take 586 * focus. 587 * 588 * @param focused The view that currently has focus 589 * @param direction One of FOCUS_UP, FOCUS_DOWN, FOCUS_LEFT, and 590 * FOCUS_RIGHT, or 0 for not applicable. 591 */ 592 public View focusSearch(View focused, int direction) { 593 if (isRootNamespace()) { 594 // root namespace means we should consider ourselves the top of the 595 // tree for focus searching; otherwise we could be focus searching 596 // into other tabs. see LocalActivityManager and TabHost for more info 597 return FocusFinder.getInstance().findNextFocus(this, focused, direction); 598 } else if (mParent != null) { 599 return mParent.focusSearch(focused, direction); 600 } 601 return null; 602 } 603 604 /** 605 * {@inheritDoc} 606 */ 607 public boolean requestChildRectangleOnScreen(View child, Rect rectangle, boolean immediate) { 608 return false; 609 } 610 611 /** 612 * {@inheritDoc} 613 */ 614 public boolean requestSendAccessibilityEvent(View child, AccessibilityEvent event) { 615 ViewParent parent = getParent(); 616 if (parent == null) { 617 return false; 618 } 619 final boolean propagate = onRequestSendAccessibilityEvent(child, event); 620 //noinspection SimplifiableIfStatement 621 if (!propagate) { 622 return false; 623 } 624 return parent.requestSendAccessibilityEvent(this, event); 625 } 626 627 /** 628 * Called when a child has requested sending an {@link AccessibilityEvent} and 629 * gives an opportunity to its parent to augment the event. 630 * <p> 631 * If an {@link android.view.View.AccessibilityDelegate} has been specified via calling 632 * {@link android.view.View#setAccessibilityDelegate(android.view.View.AccessibilityDelegate)} its 633 * {@link android.view.View.AccessibilityDelegate#onRequestSendAccessibilityEvent(ViewGroup, View, AccessibilityEvent)} 634 * is responsible for handling this call. 635 * </p> 636 * 637 * @param child The child which requests sending the event. 638 * @param event The event to be sent. 639 * @return True if the event should be sent. 640 * 641 * @see #requestSendAccessibilityEvent(View, AccessibilityEvent) 642 */ 643 public boolean onRequestSendAccessibilityEvent(View child, AccessibilityEvent event) { 644 if (mAccessibilityDelegate != null) { 645 return mAccessibilityDelegate.onRequestSendAccessibilityEvent(this, child, event); 646 } else { 647 return onRequestSendAccessibilityEventInternal(child, event); 648 } 649 } 650 651 /** 652 * @see #onRequestSendAccessibilityEvent(View, AccessibilityEvent) 653 * 654 * Note: Called from the default {@link View.AccessibilityDelegate}. 655 */ 656 boolean onRequestSendAccessibilityEventInternal(View child, AccessibilityEvent event) { 657 return true; 658 } 659 660 /** 661 * Called when a child view has changed whether or not it is tracking transient state. 662 * 663 * @hide 664 */ 665 public void childHasTransientStateChanged(View child, boolean childHasTransientState) { 666 final boolean oldHasTransientState = hasTransientState(); 667 if (childHasTransientState) { 668 mChildCountWithTransientState++; 669 } else { 670 mChildCountWithTransientState--; 671 } 672 673 final boolean newHasTransientState = hasTransientState(); 674 if (mParent != null && oldHasTransientState != newHasTransientState) { 675 try { 676 mParent.childHasTransientStateChanged(this, newHasTransientState); 677 } catch (AbstractMethodError e) { 678 Log.e(TAG, mParent.getClass().getSimpleName() + 679 " does not fully implement ViewParent", e); 680 } 681 } 682 } 683 684 /** 685 * @hide 686 */ 687 @Override 688 public boolean hasTransientState() { 689 return mChildCountWithTransientState > 0 || super.hasTransientState(); 690 } 691 692 /** 693 * {@inheritDoc} 694 */ 695 @Override 696 public boolean dispatchUnhandledMove(View focused, int direction) { 697 return mFocused != null && 698 mFocused.dispatchUnhandledMove(focused, direction); 699 } 700 701 /** 702 * {@inheritDoc} 703 */ 704 public void clearChildFocus(View child) { 705 if (DBG) { 706 System.out.println(this + " clearChildFocus()"); 707 } 708 709 mFocused = null; 710 if (mParent != null) { 711 mParent.clearChildFocus(this); 712 } 713 } 714 715 /** 716 * {@inheritDoc} 717 */ 718 @Override 719 public void clearFocus() { 720 if (DBG) { 721 System.out.println(this + " clearFocus()"); 722 } 723 if (mFocused == null) { 724 super.clearFocus(); 725 } else { 726 mFocused.clearFocus(); 727 mFocused = null; 728 } 729 } 730 731 /** 732 * {@inheritDoc} 733 */ 734 @Override 735 void unFocus() { 736 if (DBG) { 737 System.out.println(this + " unFocus()"); 738 } 739 if (mFocused == null) { 740 super.unFocus(); 741 } else { 742 mFocused.unFocus(); 743 mFocused = null; 744 } 745 } 746 747 /** 748 * Returns the focused child of this view, if any. The child may have focus 749 * or contain focus. 750 * 751 * @return the focused child or null. 752 */ 753 public View getFocusedChild() { 754 return mFocused; 755 } 756 757 /** 758 * Returns true if this view has or contains focus 759 * 760 * @return true if this view has or contains focus 761 */ 762 @Override 763 public boolean hasFocus() { 764 return (mPrivateFlags & FOCUSED) != 0 || mFocused != null; 765 } 766 767 /* 768 * (non-Javadoc) 769 * 770 * @see android.view.View#findFocus() 771 */ 772 @Override 773 public View findFocus() { 774 if (DBG) { 775 System.out.println("Find focus in " + this + ": flags=" 776 + isFocused() + ", child=" + mFocused); 777 } 778 779 if (isFocused()) { 780 return this; 781 } 782 783 if (mFocused != null) { 784 return mFocused.findFocus(); 785 } 786 return null; 787 } 788 789 /** 790 * {@inheritDoc} 791 */ 792 @Override 793 public boolean hasFocusable() { 794 if ((mViewFlags & VISIBILITY_MASK) != VISIBLE) { 795 return false; 796 } 797 798 if (isFocusable()) { 799 return true; 800 } 801 802 final int descendantFocusability = getDescendantFocusability(); 803 if (descendantFocusability != FOCUS_BLOCK_DESCENDANTS) { 804 final int count = mChildrenCount; 805 final View[] children = mChildren; 806 807 for (int i = 0; i < count; i++) { 808 final View child = children[i]; 809 if (child.hasFocusable()) { 810 return true; 811 } 812 } 813 } 814 815 return false; 816 } 817 818 /** 819 * {@inheritDoc} 820 */ 821 @Override 822 public void addFocusables(ArrayList<View> views, int direction) { 823 addFocusables(views, direction, FOCUSABLES_TOUCH_MODE); 824 } 825 826 /** 827 * {@inheritDoc} 828 */ 829 @Override 830 public void addFocusables(ArrayList<View> views, int direction, int focusableMode) { 831 final int focusableCount = views.size(); 832 833 final int descendantFocusability = getDescendantFocusability(); 834 835 if (descendantFocusability != FOCUS_BLOCK_DESCENDANTS) { 836 final int count = mChildrenCount; 837 final View[] children = mChildren; 838 839 for (int i = 0; i < count; i++) { 840 final View child = children[i]; 841 if ((child.mViewFlags & VISIBILITY_MASK) == VISIBLE) { 842 child.addFocusables(views, direction, focusableMode); 843 } 844 } 845 } 846 847 // we add ourselves (if focusable) in all cases except for when we are 848 // FOCUS_AFTER_DESCENDANTS and there are some descendants focusable. this is 849 // to avoid the focus search finding layouts when a more precise search 850 // among the focusable children would be more interesting. 851 if ( 852 descendantFocusability != FOCUS_AFTER_DESCENDANTS || 853 // No focusable descendants 854 (focusableCount == views.size())) { 855 super.addFocusables(views, direction, focusableMode); 856 } 857 } 858 859 @Override 860 public void findViewsWithText(ArrayList<View> outViews, CharSequence text, int flags) { 861 super.findViewsWithText(outViews, text, flags); 862 final int childrenCount = mChildrenCount; 863 final View[] children = mChildren; 864 for (int i = 0; i < childrenCount; i++) { 865 View child = children[i]; 866 if ((child.mViewFlags & VISIBILITY_MASK) == VISIBLE 867 && (child.mPrivateFlags & IS_ROOT_NAMESPACE) == 0) { 868 child.findViewsWithText(outViews, text, flags); 869 } 870 } 871 } 872 873 @Override 874 View findViewByAccessibilityIdTraversal(int accessibilityId) { 875 View foundView = super.findViewByAccessibilityIdTraversal(accessibilityId); 876 if (foundView != null) { 877 return foundView; 878 } 879 final int childrenCount = mChildrenCount; 880 final View[] children = mChildren; 881 for (int i = 0; i < childrenCount; i++) { 882 View child = children[i]; 883 foundView = child.findViewByAccessibilityIdTraversal(accessibilityId); 884 if (foundView != null) { 885 return foundView; 886 } 887 } 888 return null; 889 } 890 891 /** 892 * {@inheritDoc} 893 */ 894 @Override 895 public void dispatchWindowFocusChanged(boolean hasFocus) { 896 super.dispatchWindowFocusChanged(hasFocus); 897 final int count = mChildrenCount; 898 final View[] children = mChildren; 899 for (int i = 0; i < count; i++) { 900 children[i].dispatchWindowFocusChanged(hasFocus); 901 } 902 } 903 904 /** 905 * {@inheritDoc} 906 */ 907 @Override 908 public void addTouchables(ArrayList<View> views) { 909 super.addTouchables(views); 910 911 final int count = mChildrenCount; 912 final View[] children = mChildren; 913 914 for (int i = 0; i < count; i++) { 915 final View child = children[i]; 916 if ((child.mViewFlags & VISIBILITY_MASK) == VISIBLE) { 917 child.addTouchables(views); 918 } 919 } 920 } 921 922 /** 923 * {@inheritDoc} 924 */ 925 @Override 926 public void dispatchDisplayHint(int hint) { 927 super.dispatchDisplayHint(hint); 928 final int count = mChildrenCount; 929 final View[] children = mChildren; 930 for (int i = 0; i < count; i++) { 931 children[i].dispatchDisplayHint(hint); 932 } 933 } 934 935 /** 936 * Called when a view's visibility has changed. Notify the parent to take any appropriate 937 * action. 938 * 939 * @param child The view whose visibility has changed 940 * @param oldVisibility The previous visibility value (GONE, INVISIBLE, or VISIBLE). 941 * @param newVisibility The new visibility value (GONE, INVISIBLE, or VISIBLE). 942 * @hide 943 */ 944 protected void onChildVisibilityChanged(View child, int oldVisibility, int newVisibility) { 945 if (mTransition != null) { 946 if (newVisibility == VISIBLE) { 947 mTransition.showChild(this, child, oldVisibility); 948 } else { 949 mTransition.hideChild(this, child, newVisibility); 950 // Only track this on disappearing views - appearing views are already visible 951 // and don't need special handling during drawChild() 952 if (mVisibilityChangingChildren == null) { 953 mVisibilityChangingChildren = new ArrayList<View>(); 954 } 955 mVisibilityChangingChildren.add(child); 956 if (mTransitioningViews != null && mTransitioningViews.contains(child)) { 957 addDisappearingView(child); 958 } 959 } 960 } 961 962 // in all cases, for drags 963 if (mCurrentDrag != null) { 964 if (newVisibility == VISIBLE) { 965 notifyChildOfDrag(child); 966 } 967 } 968 } 969 970 /** 971 * {@inheritDoc} 972 */ 973 @Override 974 protected void dispatchVisibilityChanged(View changedView, int visibility) { 975 super.dispatchVisibilityChanged(changedView, visibility); 976 final int count = mChildrenCount; 977 final View[] children = mChildren; 978 for (int i = 0; i < count; i++) { 979 children[i].dispatchVisibilityChanged(changedView, visibility); 980 } 981 } 982 983 /** 984 * {@inheritDoc} 985 */ 986 @Override 987 public void dispatchWindowVisibilityChanged(int visibility) { 988 super.dispatchWindowVisibilityChanged(visibility); 989 final int count = mChildrenCount; 990 final View[] children = mChildren; 991 for (int i = 0; i < count; i++) { 992 children[i].dispatchWindowVisibilityChanged(visibility); 993 } 994 } 995 996 /** 997 * {@inheritDoc} 998 */ 999 @Override 1000 public void dispatchConfigurationChanged(Configuration newConfig) { 1001 super.dispatchConfigurationChanged(newConfig); 1002 final int count = mChildrenCount; 1003 final View[] children = mChildren; 1004 for (int i = 0; i < count; i++) { 1005 children[i].dispatchConfigurationChanged(newConfig); 1006 } 1007 } 1008 1009 /** 1010 * {@inheritDoc} 1011 */ 1012 public void recomputeViewAttributes(View child) { 1013 if (mAttachInfo != null && !mAttachInfo.mRecomputeGlobalAttributes) { 1014 ViewParent parent = mParent; 1015 if (parent != null) parent.recomputeViewAttributes(this); 1016 } 1017 } 1018 1019 @Override 1020 void dispatchCollectViewAttributes(int visibility) { 1021 visibility |= mViewFlags&VISIBILITY_MASK; 1022 super.dispatchCollectViewAttributes(visibility); 1023 final int count = mChildrenCount; 1024 final View[] children = mChildren; 1025 for (int i = 0; i < count; i++) { 1026 children[i].dispatchCollectViewAttributes(visibility); 1027 } 1028 } 1029 1030 /** 1031 * {@inheritDoc} 1032 */ 1033 public void bringChildToFront(View child) { 1034 int index = indexOfChild(child); 1035 if (index >= 0) { 1036 removeFromArray(index); 1037 addInArray(child, mChildrenCount); 1038 child.mParent = this; 1039 } 1040 } 1041 1042 /** 1043 * {@inheritDoc} 1044 */ 1045 // TODO: Write real docs 1046 @Override 1047 public boolean dispatchDragEvent(DragEvent event) { 1048 boolean retval = false; 1049 final float tx = event.mX; 1050 final float ty = event.mY; 1051 1052 ViewRootImpl root = getViewRootImpl(); 1053 1054 // Dispatch down the view hierarchy 1055 switch (event.mAction) { 1056 case DragEvent.ACTION_DRAG_STARTED: { 1057 // clear state to recalculate which views we drag over 1058 mCurrentDragView = null; 1059 1060 // Set up our tracking of drag-started notifications 1061 mCurrentDrag = DragEvent.obtain(event); 1062 if (mDragNotifiedChildren == null) { 1063 mDragNotifiedChildren = new HashSet<View>(); 1064 } else { 1065 mDragNotifiedChildren.clear(); 1066 } 1067 1068 // Now dispatch down to our children, caching the responses 1069 mChildAcceptsDrag = false; 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.mPrivateFlags2 &= ~View.DRAG_MASK; 1075 if (child.getVisibility() == VISIBLE) { 1076 final boolean handled = notifyChildOfDrag(children[i]); 1077 if (handled) { 1078 mChildAcceptsDrag = true; 1079 } 1080 } 1081 } 1082 1083 // Return HANDLED if one of our children can accept the drag 1084 if (mChildAcceptsDrag) { 1085 retval = true; 1086 } 1087 } break; 1088 1089 case DragEvent.ACTION_DRAG_ENDED: { 1090 // Release the bookkeeping now that the drag lifecycle has ended 1091 if (mDragNotifiedChildren != null) { 1092 for (View child : mDragNotifiedChildren) { 1093 // If a child was notified about an ongoing drag, it's told that it's over 1094 child.dispatchDragEvent(event); 1095 child.mPrivateFlags2 &= ~View.DRAG_MASK; 1096 child.refreshDrawableState(); 1097 } 1098 1099 mDragNotifiedChildren.clear(); 1100 mCurrentDrag.recycle(); 1101 mCurrentDrag = null; 1102 } 1103 1104 // We consider drag-ended to have been handled if one of our children 1105 // had offered to handle the drag. 1106 if (mChildAcceptsDrag) { 1107 retval = true; 1108 } 1109 } break; 1110 1111 case DragEvent.ACTION_DRAG_LOCATION: { 1112 // Find the [possibly new] drag target 1113 final View target = findFrontmostDroppableChildAt(event.mX, event.mY, mLocalPoint); 1114 1115 // If we've changed apparent drag target, tell the view root which view 1116 // we're over now [for purposes of the eventual drag-recipient-changed 1117 // notifications to the framework] and tell the new target that the drag 1118 // has entered its bounds. The root will see setDragFocus() calls all 1119 // the way down to the final leaf view that is handling the LOCATION event 1120 // before reporting the new potential recipient to the framework. 1121 if (mCurrentDragView != target) { 1122 root.setDragFocus(target); 1123 1124 final int action = event.mAction; 1125 // If we've dragged off of a child view, send it the EXITED message 1126 if (mCurrentDragView != null) { 1127 final View view = mCurrentDragView; 1128 event.mAction = DragEvent.ACTION_DRAG_EXITED; 1129 view.dispatchDragEvent(event); 1130 view.mPrivateFlags2 &= ~View.DRAG_HOVERED; 1131 view.refreshDrawableState(); 1132 } 1133 mCurrentDragView = target; 1134 1135 // If we've dragged over a new child view, send it the ENTERED message 1136 if (target != null) { 1137 event.mAction = DragEvent.ACTION_DRAG_ENTERED; 1138 target.dispatchDragEvent(event); 1139 target.mPrivateFlags2 |= View.DRAG_HOVERED; 1140 target.refreshDrawableState(); 1141 } 1142 event.mAction = action; // restore the event's original state 1143 } 1144 1145 // Dispatch the actual drag location notice, localized into its coordinates 1146 if (target != null) { 1147 event.mX = mLocalPoint.x; 1148 event.mY = mLocalPoint.y; 1149 1150 retval = target.dispatchDragEvent(event); 1151 1152 event.mX = tx; 1153 event.mY = ty; 1154 } 1155 } break; 1156 1157 /* Entered / exited dispatch 1158 * 1159 * DRAG_ENTERED is not dispatched downwards from ViewGroup. The reason for this is 1160 * that we're about to get the corresponding LOCATION event, which we will use to 1161 * determine which of our children is the new target; at that point we will 1162 * push a DRAG_ENTERED down to the new target child [which may itself be a ViewGroup]. 1163 * 1164 * DRAG_EXITED *is* dispatched all the way down immediately: once we know the 1165 * drag has left this ViewGroup, we know by definition that every contained subview 1166 * is also no longer under the drag point. 1167 */ 1168 1169 case DragEvent.ACTION_DRAG_EXITED: { 1170 if (mCurrentDragView != null) { 1171 final View view = mCurrentDragView; 1172 view.dispatchDragEvent(event); 1173 view.mPrivateFlags2 &= ~View.DRAG_HOVERED; 1174 view.refreshDrawableState(); 1175 1176 mCurrentDragView = null; 1177 } 1178 } break; 1179 1180 case DragEvent.ACTION_DROP: { 1181 if (ViewDebug.DEBUG_DRAG) Log.d(View.VIEW_LOG_TAG, "Drop event: " + event); 1182 View target = findFrontmostDroppableChildAt(event.mX, event.mY, mLocalPoint); 1183 if (target != null) { 1184 if (ViewDebug.DEBUG_DRAG) Log.d(View.VIEW_LOG_TAG, " dispatch drop to " + target); 1185 event.mX = mLocalPoint.x; 1186 event.mY = mLocalPoint.y; 1187 retval = target.dispatchDragEvent(event); 1188 event.mX = tx; 1189 event.mY = ty; 1190 } else { 1191 if (ViewDebug.DEBUG_DRAG) { 1192 Log.d(View.VIEW_LOG_TAG, " not dropped on an accepting view"); 1193 } 1194 } 1195 } break; 1196 } 1197 1198 // If none of our children could handle the event, try here 1199 if (!retval) { 1200 // Call up to the View implementation that dispatches to installed listeners 1201 retval = super.dispatchDragEvent(event); 1202 } 1203 return retval; 1204 } 1205 1206 // Find the frontmost child view that lies under the given point, and calculate 1207 // the position within its own local coordinate system. 1208 View findFrontmostDroppableChildAt(float x, float y, PointF outLocalPoint) { 1209 final int count = mChildrenCount; 1210 final View[] children = mChildren; 1211 for (int i = count - 1; i >= 0; i--) { 1212 final View child = children[i]; 1213 if (!child.canAcceptDrag()) { 1214 continue; 1215 } 1216 1217 if (isTransformedTouchPointInView(x, y, child, outLocalPoint)) { 1218 return child; 1219 } 1220 } 1221 return null; 1222 } 1223 1224 boolean notifyChildOfDrag(View child) { 1225 if (ViewDebug.DEBUG_DRAG) { 1226 Log.d(View.VIEW_LOG_TAG, "Sending drag-started to view: " + child); 1227 } 1228 1229 boolean canAccept = false; 1230 if (! mDragNotifiedChildren.contains(child)) { 1231 mDragNotifiedChildren.add(child); 1232 canAccept = child.dispatchDragEvent(mCurrentDrag); 1233 if (canAccept && !child.canAcceptDrag()) { 1234 child.mPrivateFlags2 |= View.DRAG_CAN_ACCEPT; 1235 child.refreshDrawableState(); 1236 } 1237 } 1238 return canAccept; 1239 } 1240 1241 @Override 1242 public void dispatchSystemUiVisibilityChanged(int visible) { 1243 super.dispatchSystemUiVisibilityChanged(visible); 1244 1245 final int count = mChildrenCount; 1246 final View[] children = mChildren; 1247 for (int i=0; i <count; i++) { 1248 final View child = children[i]; 1249 child.dispatchSystemUiVisibilityChanged(visible); 1250 } 1251 } 1252 1253 @Override 1254 void updateLocalSystemUiVisibility(int localValue, int localChanges) { 1255 super.updateLocalSystemUiVisibility(localValue, localChanges); 1256 1257 final int count = mChildrenCount; 1258 final View[] children = mChildren; 1259 for (int i=0; i <count; i++) { 1260 final View child = children[i]; 1261 child.updateLocalSystemUiVisibility(localValue, localChanges); 1262 } 1263 } 1264 1265 /** 1266 * {@inheritDoc} 1267 */ 1268 @Override 1269 public boolean dispatchKeyEventPreIme(KeyEvent event) { 1270 if ((mPrivateFlags & (FOCUSED | HAS_BOUNDS)) == (FOCUSED | HAS_BOUNDS)) { 1271 return super.dispatchKeyEventPreIme(event); 1272 } else if (mFocused != null && (mFocused.mPrivateFlags & HAS_BOUNDS) == HAS_BOUNDS) { 1273 return mFocused.dispatchKeyEventPreIme(event); 1274 } 1275 return false; 1276 } 1277 1278 /** 1279 * {@inheritDoc} 1280 */ 1281 @Override 1282 public boolean dispatchKeyEvent(KeyEvent event) { 1283 if (mInputEventConsistencyVerifier != null) { 1284 mInputEventConsistencyVerifier.onKeyEvent(event, 1); 1285 } 1286 1287 if ((mPrivateFlags & (FOCUSED | HAS_BOUNDS)) == (FOCUSED | HAS_BOUNDS)) { 1288 if (super.dispatchKeyEvent(event)) { 1289 return true; 1290 } 1291 } else if (mFocused != null && (mFocused.mPrivateFlags & HAS_BOUNDS) == HAS_BOUNDS) { 1292 if (mFocused.dispatchKeyEvent(event)) { 1293 return true; 1294 } 1295 } 1296 1297 if (mInputEventConsistencyVerifier != null) { 1298 mInputEventConsistencyVerifier.onUnhandledEvent(event, 1); 1299 } 1300 return false; 1301 } 1302 1303 /** 1304 * {@inheritDoc} 1305 */ 1306 @Override 1307 public boolean dispatchKeyShortcutEvent(KeyEvent event) { 1308 if ((mPrivateFlags & (FOCUSED | HAS_BOUNDS)) == (FOCUSED | HAS_BOUNDS)) { 1309 return super.dispatchKeyShortcutEvent(event); 1310 } else if (mFocused != null && (mFocused.mPrivateFlags & HAS_BOUNDS) == HAS_BOUNDS) { 1311 return mFocused.dispatchKeyShortcutEvent(event); 1312 } 1313 return false; 1314 } 1315 1316 /** 1317 * {@inheritDoc} 1318 */ 1319 @Override 1320 public boolean dispatchTrackballEvent(MotionEvent event) { 1321 if (mInputEventConsistencyVerifier != null) { 1322 mInputEventConsistencyVerifier.onTrackballEvent(event, 1); 1323 } 1324 1325 if ((mPrivateFlags & (FOCUSED | HAS_BOUNDS)) == (FOCUSED | HAS_BOUNDS)) { 1326 if (super.dispatchTrackballEvent(event)) { 1327 return true; 1328 } 1329 } else if (mFocused != null && (mFocused.mPrivateFlags & HAS_BOUNDS) == HAS_BOUNDS) { 1330 if (mFocused.dispatchTrackballEvent(event)) { 1331 return true; 1332 } 1333 } 1334 1335 if (mInputEventConsistencyVerifier != null) { 1336 mInputEventConsistencyVerifier.onUnhandledEvent(event, 1); 1337 } 1338 return false; 1339 } 1340 1341 /** 1342 * {@inheritDoc} 1343 */ 1344 @SuppressWarnings({"ConstantConditions"}) 1345 @Override 1346 protected boolean dispatchHoverEvent(MotionEvent event) { 1347 final int action = event.getAction(); 1348 1349 // First check whether the view group wants to intercept the hover event. 1350 final boolean interceptHover = onInterceptHoverEvent(event); 1351 event.setAction(action); // restore action in case it was changed 1352 1353 MotionEvent eventNoHistory = event; 1354 boolean handled = false; 1355 1356 // Send events to the hovered children and build a new list of hover targets until 1357 // one is found that handles the event. 1358 HoverTarget firstOldHoverTarget = mFirstHoverTarget; 1359 mFirstHoverTarget = null; 1360 if (!interceptHover && action != MotionEvent.ACTION_HOVER_EXIT) { 1361 final float x = event.getX(); 1362 final float y = event.getY(); 1363 final int childrenCount = mChildrenCount; 1364 if (childrenCount != 0) { 1365 final View[] children = mChildren; 1366 HoverTarget lastHoverTarget = null; 1367 for (int i = childrenCount - 1; i >= 0; i--) { 1368 final View child = children[i]; 1369 if (!canViewReceivePointerEvents(child) 1370 || !isTransformedTouchPointInView(x, y, child, null)) { 1371 continue; 1372 } 1373 1374 // Obtain a hover target for this child. Dequeue it from the 1375 // old hover target list if the child was previously hovered. 1376 HoverTarget hoverTarget = firstOldHoverTarget; 1377 final boolean wasHovered; 1378 for (HoverTarget predecessor = null; ;) { 1379 if (hoverTarget == null) { 1380 hoverTarget = HoverTarget.obtain(child); 1381 wasHovered = false; 1382 break; 1383 } 1384 1385 if (hoverTarget.child == child) { 1386 if (predecessor != null) { 1387 predecessor.next = hoverTarget.next; 1388 } else { 1389 firstOldHoverTarget = hoverTarget.next; 1390 } 1391 hoverTarget.next = null; 1392 wasHovered = true; 1393 break; 1394 } 1395 1396 predecessor = hoverTarget; 1397 hoverTarget = hoverTarget.next; 1398 } 1399 1400 // Enqueue the hover target onto the new hover target list. 1401 if (lastHoverTarget != null) { 1402 lastHoverTarget.next = hoverTarget; 1403 } else { 1404 lastHoverTarget = hoverTarget; 1405 mFirstHoverTarget = hoverTarget; 1406 } 1407 1408 // Dispatch the event to the child. 1409 if (action == MotionEvent.ACTION_HOVER_ENTER) { 1410 if (!wasHovered) { 1411 // Send the enter as is. 1412 handled |= dispatchTransformedGenericPointerEvent( 1413 event, child); // enter 1414 } 1415 } else if (action == MotionEvent.ACTION_HOVER_MOVE) { 1416 if (!wasHovered) { 1417 // Synthesize an enter from a move. 1418 eventNoHistory = obtainMotionEventNoHistoryOrSelf(eventNoHistory); 1419 eventNoHistory.setAction(MotionEvent.ACTION_HOVER_ENTER); 1420 handled |= dispatchTransformedGenericPointerEvent( 1421 eventNoHistory, child); // enter 1422 eventNoHistory.setAction(action); 1423 1424 handled |= dispatchTransformedGenericPointerEvent( 1425 eventNoHistory, child); // move 1426 } else { 1427 // Send the move as is. 1428 handled |= dispatchTransformedGenericPointerEvent(event, child); 1429 } 1430 } 1431 if (handled) { 1432 break; 1433 } 1434 } 1435 } 1436 } 1437 1438 // Send exit events to all previously hovered children that are no longer hovered. 1439 while (firstOldHoverTarget != null) { 1440 final View child = firstOldHoverTarget.child; 1441 1442 // Exit the old hovered child. 1443 if (action == MotionEvent.ACTION_HOVER_EXIT) { 1444 // Send the exit as is. 1445 handled |= dispatchTransformedGenericPointerEvent( 1446 event, child); // exit 1447 } else { 1448 // Synthesize an exit from a move or enter. 1449 // Ignore the result because hover focus has moved to a different view. 1450 if (action == MotionEvent.ACTION_HOVER_MOVE) { 1451 dispatchTransformedGenericPointerEvent( 1452 event, child); // move 1453 } 1454 eventNoHistory = obtainMotionEventNoHistoryOrSelf(eventNoHistory); 1455 eventNoHistory.setAction(MotionEvent.ACTION_HOVER_EXIT); 1456 dispatchTransformedGenericPointerEvent( 1457 eventNoHistory, child); // exit 1458 eventNoHistory.setAction(action); 1459 } 1460 1461 final HoverTarget nextOldHoverTarget = firstOldHoverTarget.next; 1462 firstOldHoverTarget.recycle(); 1463 firstOldHoverTarget = nextOldHoverTarget; 1464 } 1465 1466 // Send events to the view group itself if no children have handled it. 1467 boolean newHoveredSelf = !handled; 1468 if (newHoveredSelf == mHoveredSelf) { 1469 if (newHoveredSelf) { 1470 // Send event to the view group as before. 1471 handled |= super.dispatchHoverEvent(event); 1472 } 1473 } else { 1474 if (mHoveredSelf) { 1475 // Exit the view group. 1476 if (action == MotionEvent.ACTION_HOVER_EXIT) { 1477 // Send the exit as is. 1478 handled |= super.dispatchHoverEvent(event); // exit 1479 } else { 1480 // Synthesize an exit from a move or enter. 1481 // Ignore the result because hover focus is moving to a different view. 1482 if (action == MotionEvent.ACTION_HOVER_MOVE) { 1483 super.dispatchHoverEvent(event); // move 1484 } 1485 eventNoHistory = obtainMotionEventNoHistoryOrSelf(eventNoHistory); 1486 eventNoHistory.setAction(MotionEvent.ACTION_HOVER_EXIT); 1487 super.dispatchHoverEvent(eventNoHistory); // exit 1488 eventNoHistory.setAction(action); 1489 } 1490 mHoveredSelf = false; 1491 } 1492 1493 if (newHoveredSelf) { 1494 // Enter the view group. 1495 if (action == MotionEvent.ACTION_HOVER_ENTER) { 1496 // Send the enter as is. 1497 handled |= super.dispatchHoverEvent(event); // enter 1498 mHoveredSelf = true; 1499 } else if (action == MotionEvent.ACTION_HOVER_MOVE) { 1500 // Synthesize an enter from a move. 1501 eventNoHistory = obtainMotionEventNoHistoryOrSelf(eventNoHistory); 1502 eventNoHistory.setAction(MotionEvent.ACTION_HOVER_ENTER); 1503 handled |= super.dispatchHoverEvent(eventNoHistory); // enter 1504 eventNoHistory.setAction(action); 1505 1506 handled |= super.dispatchHoverEvent(eventNoHistory); // move 1507 mHoveredSelf = true; 1508 } 1509 } 1510 } 1511 1512 // Recycle the copy of the event that we made. 1513 if (eventNoHistory != event) { 1514 eventNoHistory.recycle(); 1515 } 1516 1517 // Done. 1518 return handled; 1519 } 1520 1521 /** @hide */ 1522 @Override 1523 protected boolean hasHoveredChild() { 1524 return mFirstHoverTarget != null; 1525 } 1526 1527 /** 1528 * Implement this method to intercept hover events before they are handled 1529 * by child views. 1530 * <p> 1531 * This method is called before dispatching a hover event to a child of 1532 * the view group or to the view group's own {@link #onHoverEvent} to allow 1533 * the view group a chance to intercept the hover event. 1534 * This method can also be used to watch all pointer motions that occur within 1535 * the bounds of the view group even when the pointer is hovering over 1536 * a child of the view group rather than over the view group itself. 1537 * </p><p> 1538 * The view group can prevent its children from receiving hover events by 1539 * implementing this method and returning <code>true</code> to indicate 1540 * that it would like to intercept hover events. The view group must 1541 * continuously return <code>true</code> from {@link #onInterceptHoverEvent} 1542 * for as long as it wishes to continue intercepting hover events from 1543 * its children. 1544 * </p><p> 1545 * Interception preserves the invariant that at most one view can be 1546 * hovered at a time by transferring hover focus from the currently hovered 1547 * child to the view group or vice-versa as needed. 1548 * </p><p> 1549 * If this method returns <code>true</code> and a child is already hovered, then the 1550 * child view will first receive a hover exit event and then the view group 1551 * itself will receive a hover enter event in {@link #onHoverEvent}. 1552 * Likewise, if this method had previously returned <code>true</code> to intercept hover 1553 * events and instead returns <code>false</code> while the pointer is hovering 1554 * within the bounds of one of a child, then the view group will first receive a 1555 * hover exit event in {@link #onHoverEvent} and then the hovered child will 1556 * receive a hover enter event. 1557 * </p><p> 1558 * The default implementation always returns false. 1559 * </p> 1560 * 1561 * @param event The motion event that describes the hover. 1562 * @return True if the view group would like to intercept the hover event 1563 * and prevent its children from receiving it. 1564 */ 1565 public boolean onInterceptHoverEvent(MotionEvent event) { 1566 return false; 1567 } 1568 1569 private static MotionEvent obtainMotionEventNoHistoryOrSelf(MotionEvent event) { 1570 if (event.getHistorySize() == 0) { 1571 return event; 1572 } 1573 return MotionEvent.obtainNoHistory(event); 1574 } 1575 1576 /** 1577 * {@inheritDoc} 1578 */ 1579 @Override 1580 protected boolean dispatchGenericPointerEvent(MotionEvent event) { 1581 // Send the event to the child under the pointer. 1582 final int childrenCount = mChildrenCount; 1583 if (childrenCount != 0) { 1584 final View[] children = mChildren; 1585 final float x = event.getX(); 1586 final float y = event.getY(); 1587 1588 for (int i = childrenCount - 1; i >= 0; i--) { 1589 final View child = children[i]; 1590 if (!canViewReceivePointerEvents(child) 1591 || !isTransformedTouchPointInView(x, y, child, null)) { 1592 continue; 1593 } 1594 1595 if (dispatchTransformedGenericPointerEvent(event, child)) { 1596 return true; 1597 } 1598 } 1599 } 1600 1601 // No child handled the event. Send it to this view group. 1602 return super.dispatchGenericPointerEvent(event); 1603 } 1604 1605 /** 1606 * {@inheritDoc} 1607 */ 1608 @Override 1609 protected boolean dispatchGenericFocusedEvent(MotionEvent event) { 1610 // Send the event to the focused child or to this view group if it has focus. 1611 if ((mPrivateFlags & (FOCUSED | HAS_BOUNDS)) == (FOCUSED | HAS_BOUNDS)) { 1612 return super.dispatchGenericFocusedEvent(event); 1613 } else if (mFocused != null && (mFocused.mPrivateFlags & HAS_BOUNDS) == HAS_BOUNDS) { 1614 return mFocused.dispatchGenericMotionEvent(event); 1615 } 1616 return false; 1617 } 1618 1619 /** 1620 * Dispatches a generic pointer event to a child, taking into account 1621 * transformations that apply to the child. 1622 * 1623 * @param event The event to send. 1624 * @param child The view to send the event to. 1625 * @return {@code true} if the child handled the event. 1626 */ 1627 private boolean dispatchTransformedGenericPointerEvent(MotionEvent event, View child) { 1628 final float offsetX = mScrollX - child.mLeft; 1629 final float offsetY = mScrollY - child.mTop; 1630 1631 boolean handled; 1632 if (!child.hasIdentityMatrix()) { 1633 MotionEvent transformedEvent = MotionEvent.obtain(event); 1634 transformedEvent.offsetLocation(offsetX, offsetY); 1635 transformedEvent.transform(child.getInverseMatrix()); 1636 handled = child.dispatchGenericMotionEvent(transformedEvent); 1637 transformedEvent.recycle(); 1638 } else { 1639 event.offsetLocation(offsetX, offsetY); 1640 handled = child.dispatchGenericMotionEvent(event); 1641 event.offsetLocation(-offsetX, -offsetY); 1642 } 1643 return handled; 1644 } 1645 1646 /** 1647 * {@inheritDoc} 1648 */ 1649 @Override 1650 public boolean dispatchTouchEvent(MotionEvent ev) { 1651 if (mInputEventConsistencyVerifier != null) { 1652 mInputEventConsistencyVerifier.onTouchEvent(ev, 1); 1653 } 1654 1655 boolean handled = false; 1656 if (onFilterTouchEventForSecurity(ev)) { 1657 final int action = ev.getAction(); 1658 final int actionMasked = action & MotionEvent.ACTION_MASK; 1659 1660 // Handle an initial down. 1661 if (actionMasked == MotionEvent.ACTION_DOWN) { 1662 // Throw away all previous state when starting a new touch gesture. 1663 // The framework may have dropped the up or cancel event for the previous gesture 1664 // due to an app switch, ANR, or some other state change. 1665 cancelAndClearTouchTargets(ev); 1666 resetTouchState(); 1667 } 1668 1669 // Check for interception. 1670 final boolean intercepted; 1671 if (actionMasked == MotionEvent.ACTION_DOWN 1672 || mFirstTouchTarget != null) { 1673 final boolean disallowIntercept = (mGroupFlags & FLAG_DISALLOW_INTERCEPT) != 0; 1674 if (!disallowIntercept) { 1675 intercepted = onInterceptTouchEvent(ev); 1676 ev.setAction(action); // restore action in case it was changed 1677 } else { 1678 intercepted = false; 1679 } 1680 } else { 1681 // There are no touch targets and this action is not an initial down 1682 // so this view group continues to intercept touches. 1683 intercepted = true; 1684 } 1685 1686 // Check for cancelation. 1687 final boolean canceled = resetCancelNextUpFlag(this) 1688 || actionMasked == MotionEvent.ACTION_CANCEL; 1689 1690 // Update list of touch targets for pointer down, if needed. 1691 final boolean split = (mGroupFlags & FLAG_SPLIT_MOTION_EVENTS) != 0; 1692 TouchTarget newTouchTarget = null; 1693 boolean alreadyDispatchedToNewTouchTarget = false; 1694 if (!canceled && !intercepted) { 1695 if (actionMasked == MotionEvent.ACTION_DOWN 1696 || (split && actionMasked == MotionEvent.ACTION_POINTER_DOWN) 1697 || actionMasked == MotionEvent.ACTION_HOVER_MOVE) { 1698 final int actionIndex = ev.getActionIndex(); // always 0 for down 1699 final int idBitsToAssign = split ? 1 << ev.getPointerId(actionIndex) 1700 : TouchTarget.ALL_POINTER_IDS; 1701 1702 // Clean up earlier touch targets for this pointer id in case they 1703 // have become out of sync. 1704 removePointersFromTouchTargets(idBitsToAssign); 1705 1706 final int childrenCount = mChildrenCount; 1707 if (childrenCount != 0) { 1708 // Find a child that can receive the event. 1709 // Scan children from front to back. 1710 final View[] children = mChildren; 1711 final float x = ev.getX(actionIndex); 1712 final float y = ev.getY(actionIndex); 1713 1714 for (int i = childrenCount - 1; i >= 0; i--) { 1715 final View child = children[i]; 1716 if (!canViewReceivePointerEvents(child) 1717 || !isTransformedTouchPointInView(x, y, child, null)) { 1718 continue; 1719 } 1720 1721 newTouchTarget = getTouchTarget(child); 1722 if (newTouchTarget != null) { 1723 // Child is already receiving touch within its bounds. 1724 // Give it the new pointer in addition to the ones it is handling. 1725 newTouchTarget.pointerIdBits |= idBitsToAssign; 1726 break; 1727 } 1728 1729 resetCancelNextUpFlag(child); 1730 if (dispatchTransformedTouchEvent(ev, false, child, idBitsToAssign)) { 1731 // Child wants to receive touch within its bounds. 1732 mLastTouchDownTime = ev.getDownTime(); 1733 mLastTouchDownIndex = i; 1734 mLastTouchDownX = ev.getX(); 1735 mLastTouchDownY = ev.getY(); 1736 newTouchTarget = addTouchTarget(child, idBitsToAssign); 1737 alreadyDispatchedToNewTouchTarget = true; 1738 break; 1739 } 1740 } 1741 } 1742 1743 if (newTouchTarget == null && mFirstTouchTarget != null) { 1744 // Did not find a child to receive the event. 1745 // Assign the pointer to the least recently added target. 1746 newTouchTarget = mFirstTouchTarget; 1747 while (newTouchTarget.next != null) { 1748 newTouchTarget = newTouchTarget.next; 1749 } 1750 newTouchTarget.pointerIdBits |= idBitsToAssign; 1751 } 1752 } 1753 } 1754 1755 // Dispatch to touch targets. 1756 if (mFirstTouchTarget == null) { 1757 // No touch targets so treat this as an ordinary view. 1758 handled = dispatchTransformedTouchEvent(ev, canceled, null, 1759 TouchTarget.ALL_POINTER_IDS); 1760 } else { 1761 // Dispatch to touch targets, excluding the new touch target if we already 1762 // dispatched to it. Cancel touch targets if necessary. 1763 TouchTarget predecessor = null; 1764 TouchTarget target = mFirstTouchTarget; 1765 while (target != null) { 1766 final TouchTarget next = target.next; 1767 if (alreadyDispatchedToNewTouchTarget && target == newTouchTarget) { 1768 handled = true; 1769 } else { 1770 final boolean cancelChild = resetCancelNextUpFlag(target.child) 1771 || intercepted; 1772 if (dispatchTransformedTouchEvent(ev, cancelChild, 1773 target.child, target.pointerIdBits)) { 1774 handled = true; 1775 } 1776 if (cancelChild) { 1777 if (predecessor == null) { 1778 mFirstTouchTarget = next; 1779 } else { 1780 predecessor.next = next; 1781 } 1782 target.recycle(); 1783 target = next; 1784 continue; 1785 } 1786 } 1787 predecessor = target; 1788 target = next; 1789 } 1790 } 1791 1792 // Update list of touch targets for pointer up or cancel, if needed. 1793 if (canceled 1794 || actionMasked == MotionEvent.ACTION_UP 1795 || actionMasked == MotionEvent.ACTION_HOVER_MOVE) { 1796 resetTouchState(); 1797 } else if (split && actionMasked == MotionEvent.ACTION_POINTER_UP) { 1798 final int actionIndex = ev.getActionIndex(); 1799 final int idBitsToRemove = 1 << ev.getPointerId(actionIndex); 1800 removePointersFromTouchTargets(idBitsToRemove); 1801 } 1802 } 1803 1804 if (!handled && mInputEventConsistencyVerifier != null) { 1805 mInputEventConsistencyVerifier.onUnhandledEvent(ev, 1); 1806 } 1807 return handled; 1808 } 1809 1810 /** 1811 * Resets all touch state in preparation for a new cycle. 1812 */ 1813 private void resetTouchState() { 1814 clearTouchTargets(); 1815 resetCancelNextUpFlag(this); 1816 mGroupFlags &= ~FLAG_DISALLOW_INTERCEPT; 1817 } 1818 1819 /** 1820 * Resets the cancel next up flag. 1821 * Returns true if the flag was previously set. 1822 */ 1823 private boolean resetCancelNextUpFlag(View view) { 1824 if ((view.mPrivateFlags & CANCEL_NEXT_UP_EVENT) != 0) { 1825 view.mPrivateFlags &= ~CANCEL_NEXT_UP_EVENT; 1826 return true; 1827 } 1828 return false; 1829 } 1830 1831 /** 1832 * Clears all touch targets. 1833 */ 1834 private void clearTouchTargets() { 1835 TouchTarget target = mFirstTouchTarget; 1836 if (target != null) { 1837 do { 1838 TouchTarget next = target.next; 1839 target.recycle(); 1840 target = next; 1841 } while (target != null); 1842 mFirstTouchTarget = null; 1843 } 1844 } 1845 1846 /** 1847 * Cancels and clears all touch targets. 1848 */ 1849 private void cancelAndClearTouchTargets(MotionEvent event) { 1850 if (mFirstTouchTarget != null) { 1851 boolean syntheticEvent = false; 1852 if (event == null) { 1853 final long now = SystemClock.uptimeMillis(); 1854 event = MotionEvent.obtain(now, now, 1855 MotionEvent.ACTION_CANCEL, 0.0f, 0.0f, 0); 1856 event.setSource(InputDevice.SOURCE_TOUCHSCREEN); 1857 syntheticEvent = true; 1858 } 1859 1860 for (TouchTarget target = mFirstTouchTarget; target != null; target = target.next) { 1861 resetCancelNextUpFlag(target.child); 1862 dispatchTransformedTouchEvent(event, true, target.child, target.pointerIdBits); 1863 } 1864 clearTouchTargets(); 1865 1866 if (syntheticEvent) { 1867 event.recycle(); 1868 } 1869 } 1870 } 1871 1872 /** 1873 * Gets the touch target for specified child view. 1874 * Returns null if not found. 1875 */ 1876 private TouchTarget getTouchTarget(View child) { 1877 for (TouchTarget target = mFirstTouchTarget; target != null; target = target.next) { 1878 if (target.child == child) { 1879 return target; 1880 } 1881 } 1882 return null; 1883 } 1884 1885 /** 1886 * Adds a touch target for specified child to the beginning of the list. 1887 * Assumes the target child is not already present. 1888 */ 1889 private TouchTarget addTouchTarget(View child, int pointerIdBits) { 1890 TouchTarget target = TouchTarget.obtain(child, pointerIdBits); 1891 target.next = mFirstTouchTarget; 1892 mFirstTouchTarget = target; 1893 return target; 1894 } 1895 1896 /** 1897 * Removes the pointer ids from consideration. 1898 */ 1899 private void removePointersFromTouchTargets(int pointerIdBits) { 1900 TouchTarget predecessor = null; 1901 TouchTarget target = mFirstTouchTarget; 1902 while (target != null) { 1903 final TouchTarget next = target.next; 1904 if ((target.pointerIdBits & pointerIdBits) != 0) { 1905 target.pointerIdBits &= ~pointerIdBits; 1906 if (target.pointerIdBits == 0) { 1907 if (predecessor == null) { 1908 mFirstTouchTarget = next; 1909 } else { 1910 predecessor.next = next; 1911 } 1912 target.recycle(); 1913 target = next; 1914 continue; 1915 } 1916 } 1917 predecessor = target; 1918 target = next; 1919 } 1920 } 1921 1922 /** 1923 * Returns true if a child view can receive pointer events. 1924 * @hide 1925 */ 1926 private static boolean canViewReceivePointerEvents(View child) { 1927 return (child.mViewFlags & VISIBILITY_MASK) == VISIBLE 1928 || child.getAnimation() != null; 1929 } 1930 1931 /** 1932 * Returns true if a child view contains the specified point when transformed 1933 * into its coordinate space. 1934 * Child must not be null. 1935 * @hide 1936 */ 1937 protected boolean isTransformedTouchPointInView(float x, float y, View child, 1938 PointF outLocalPoint) { 1939 float localX = x + mScrollX - child.mLeft; 1940 float localY = y + mScrollY - child.mTop; 1941 if (! child.hasIdentityMatrix() && mAttachInfo != null) { 1942 final float[] localXY = mAttachInfo.mTmpTransformLocation; 1943 localXY[0] = localX; 1944 localXY[1] = localY; 1945 child.getInverseMatrix().mapPoints(localXY); 1946 localX = localXY[0]; 1947 localY = localXY[1]; 1948 } 1949 final boolean isInView = child.pointInView(localX, localY); 1950 if (isInView && outLocalPoint != null) { 1951 outLocalPoint.set(localX, localY); 1952 } 1953 return isInView; 1954 } 1955 1956 /** 1957 * Transforms a motion event into the coordinate space of a particular child view, 1958 * filters out irrelevant pointer ids, and overrides its action if necessary. 1959 * If child is null, assumes the MotionEvent will be sent to this ViewGroup instead. 1960 */ 1961 private boolean dispatchTransformedTouchEvent(MotionEvent event, boolean cancel, 1962 View child, int desiredPointerIdBits) { 1963 final boolean handled; 1964 1965 // Canceling motions is a special case. We don't need to perform any transformations 1966 // or filtering. The important part is the action, not the contents. 1967 final int oldAction = event.getAction(); 1968 if (cancel || oldAction == MotionEvent.ACTION_CANCEL) { 1969 event.setAction(MotionEvent.ACTION_CANCEL); 1970 if (child == null) { 1971 handled = super.dispatchTouchEvent(event); 1972 } else { 1973 handled = child.dispatchTouchEvent(event); 1974 } 1975 event.setAction(oldAction); 1976 return handled; 1977 } 1978 1979 // Calculate the number of pointers to deliver. 1980 final int oldPointerIdBits = event.getPointerIdBits(); 1981 final int newPointerIdBits = oldPointerIdBits & desiredPointerIdBits; 1982 1983 // If for some reason we ended up in an inconsistent state where it looks like we 1984 // might produce a motion event with no pointers in it, then drop the event. 1985 if (newPointerIdBits == 0) { 1986 return false; 1987 } 1988 1989 // If the number of pointers is the same and we don't need to perform any fancy 1990 // irreversible transformations, then we can reuse the motion event for this 1991 // dispatch as long as we are careful to revert any changes we make. 1992 // Otherwise we need to make a copy. 1993 final MotionEvent transformedEvent; 1994 if (newPointerIdBits == oldPointerIdBits) { 1995 if (child == null || child.hasIdentityMatrix()) { 1996 if (child == null) { 1997 handled = super.dispatchTouchEvent(event); 1998 } else { 1999 final float offsetX = mScrollX - child.mLeft; 2000 final float offsetY = mScrollY - child.mTop; 2001 event.offsetLocation(offsetX, offsetY); 2002 2003 handled = child.dispatchTouchEvent(event); 2004 2005 event.offsetLocation(-offsetX, -offsetY); 2006 } 2007 return handled; 2008 } 2009 transformedEvent = MotionEvent.obtain(event); 2010 } else { 2011 transformedEvent = event.split(newPointerIdBits); 2012 } 2013 2014 // Perform any necessary transformations and dispatch. 2015 if (child == null) { 2016 handled = super.dispatchTouchEvent(transformedEvent); 2017 } else { 2018 final float offsetX = mScrollX - child.mLeft; 2019 final float offsetY = mScrollY - child.mTop; 2020 transformedEvent.offsetLocation(offsetX, offsetY); 2021 if (! child.hasIdentityMatrix()) { 2022 transformedEvent.transform(child.getInverseMatrix()); 2023 } 2024 2025 handled = child.dispatchTouchEvent(transformedEvent); 2026 } 2027 2028 // Done. 2029 transformedEvent.recycle(); 2030 return handled; 2031 } 2032 2033 /** 2034 * Enable or disable the splitting of MotionEvents to multiple children during touch event 2035 * dispatch. This behavior is enabled by default for applications that target an 2036 * SDK version of {@link Build.VERSION_CODES#HONEYCOMB} or newer. 2037 * 2038 * <p>When this option is enabled MotionEvents may be split and dispatched to different child 2039 * views depending on where each pointer initially went down. This allows for user interactions 2040 * such as scrolling two panes of content independently, chording of buttons, and performing 2041 * independent gestures on different pieces of content. 2042 * 2043 * @param split <code>true</code> to allow MotionEvents to be split and dispatched to multiple 2044 * child views. <code>false</code> to only allow one child view to be the target of 2045 * any MotionEvent received by this ViewGroup. 2046 */ 2047 public void setMotionEventSplittingEnabled(boolean split) { 2048 // TODO Applications really shouldn't change this setting mid-touch event, 2049 // but perhaps this should handle that case and send ACTION_CANCELs to any child views 2050 // with gestures in progress when this is changed. 2051 if (split) { 2052 mGroupFlags |= FLAG_SPLIT_MOTION_EVENTS; 2053 } else { 2054 mGroupFlags &= ~FLAG_SPLIT_MOTION_EVENTS; 2055 } 2056 } 2057 2058 /** 2059 * Returns true if MotionEvents dispatched to this ViewGroup can be split to multiple children. 2060 * @return true if MotionEvents dispatched to this ViewGroup can be split to multiple children. 2061 */ 2062 public boolean isMotionEventSplittingEnabled() { 2063 return (mGroupFlags & FLAG_SPLIT_MOTION_EVENTS) == FLAG_SPLIT_MOTION_EVENTS; 2064 } 2065 2066 /** 2067 * {@inheritDoc} 2068 */ 2069 public void requestDisallowInterceptTouchEvent(boolean disallowIntercept) { 2070 2071 if (disallowIntercept == ((mGroupFlags & FLAG_DISALLOW_INTERCEPT) != 0)) { 2072 // We're already in this state, assume our ancestors are too 2073 return; 2074 } 2075 2076 if (disallowIntercept) { 2077 mGroupFlags |= FLAG_DISALLOW_INTERCEPT; 2078 } else { 2079 mGroupFlags &= ~FLAG_DISALLOW_INTERCEPT; 2080 } 2081 2082 // Pass it up to our parent 2083 if (mParent != null) { 2084 mParent.requestDisallowInterceptTouchEvent(disallowIntercept); 2085 } 2086 } 2087 2088 /** 2089 * Implement this method to intercept all touch screen motion events. This 2090 * allows you to watch events as they are dispatched to your children, and 2091 * take ownership of the current gesture at any point. 2092 * 2093 * <p>Using this function takes some care, as it has a fairly complicated 2094 * interaction with {@link View#onTouchEvent(MotionEvent) 2095 * View.onTouchEvent(MotionEvent)}, and using it requires implementing 2096 * that method as well as this one in the correct way. Events will be 2097 * received in the following order: 2098 * 2099 * <ol> 2100 * <li> You will receive the down event here. 2101 * <li> The down event will be handled either by a child of this view 2102 * group, or given to your own onTouchEvent() method to handle; this means 2103 * you should implement onTouchEvent() to return true, so you will 2104 * continue to see the rest of the gesture (instead of looking for 2105 * a parent view to handle it). Also, by returning true from 2106 * onTouchEvent(), you will not receive any following 2107 * events in onInterceptTouchEvent() and all touch processing must 2108 * happen in onTouchEvent() like normal. 2109 * <li> For as long as you return false from this function, each following 2110 * event (up to and including the final up) will be delivered first here 2111 * and then to the target's onTouchEvent(). 2112 * <li> If you return true from here, you will not receive any 2113 * following events: the target view will receive the same event but 2114 * with the action {@link MotionEvent#ACTION_CANCEL}, and all further 2115 * events will be delivered to your onTouchEvent() method and no longer 2116 * appear here. 2117 * </ol> 2118 * 2119 * @param ev The motion event being dispatched down the hierarchy. 2120 * @return Return true to steal motion events from the children and have 2121 * them dispatched to this ViewGroup through onTouchEvent(). 2122 * The current target will receive an ACTION_CANCEL event, and no further 2123 * messages will be delivered here. 2124 */ 2125 public boolean onInterceptTouchEvent(MotionEvent ev) { 2126 return false; 2127 } 2128 2129 /** 2130 * {@inheritDoc} 2131 * 2132 * Looks for a view to give focus to respecting the setting specified by 2133 * {@link #getDescendantFocusability()}. 2134 * 2135 * Uses {@link #onRequestFocusInDescendants(int, android.graphics.Rect)} to 2136 * find focus within the children of this group when appropriate. 2137 * 2138 * @see #FOCUS_BEFORE_DESCENDANTS 2139 * @see #FOCUS_AFTER_DESCENDANTS 2140 * @see #FOCUS_BLOCK_DESCENDANTS 2141 * @see #onRequestFocusInDescendants(int, android.graphics.Rect) 2142 */ 2143 @Override 2144 public boolean requestFocus(int direction, Rect previouslyFocusedRect) { 2145 if (DBG) { 2146 System.out.println(this + " ViewGroup.requestFocus direction=" 2147 + direction); 2148 } 2149 int descendantFocusability = getDescendantFocusability(); 2150 2151 switch (descendantFocusability) { 2152 case FOCUS_BLOCK_DESCENDANTS: 2153 return super.requestFocus(direction, previouslyFocusedRect); 2154 case FOCUS_BEFORE_DESCENDANTS: { 2155 final boolean took = super.requestFocus(direction, previouslyFocusedRect); 2156 return took ? took : onRequestFocusInDescendants(direction, previouslyFocusedRect); 2157 } 2158 case FOCUS_AFTER_DESCENDANTS: { 2159 final boolean took = onRequestFocusInDescendants(direction, previouslyFocusedRect); 2160 return took ? took : super.requestFocus(direction, previouslyFocusedRect); 2161 } 2162 default: 2163 throw new IllegalStateException("descendant focusability must be " 2164 + "one of FOCUS_BEFORE_DESCENDANTS, FOCUS_AFTER_DESCENDANTS, FOCUS_BLOCK_DESCENDANTS " 2165 + "but is " + descendantFocusability); 2166 } 2167 } 2168 2169 /** 2170 * Look for a descendant to call {@link View#requestFocus} on. 2171 * Called by {@link ViewGroup#requestFocus(int, android.graphics.Rect)} 2172 * when it wants to request focus within its children. Override this to 2173 * customize how your {@link ViewGroup} requests focus within its children. 2174 * @param direction One of FOCUS_UP, FOCUS_DOWN, FOCUS_LEFT, and FOCUS_RIGHT 2175 * @param previouslyFocusedRect The rectangle (in this View's coordinate system) 2176 * to give a finer grained hint about where focus is coming from. May be null 2177 * if there is no hint. 2178 * @return Whether focus was taken. 2179 */ 2180 @SuppressWarnings({"ConstantConditions"}) 2181 protected boolean onRequestFocusInDescendants(int direction, 2182 Rect previouslyFocusedRect) { 2183 int index; 2184 int increment; 2185 int end; 2186 int count = mChildrenCount; 2187 if ((direction & FOCUS_FORWARD) != 0) { 2188 index = 0; 2189 increment = 1; 2190 end = count; 2191 } else { 2192 index = count - 1; 2193 increment = -1; 2194 end = -1; 2195 } 2196 final View[] children = mChildren; 2197 for (int i = index; i != end; i += increment) { 2198 View child = children[i]; 2199 if ((child.mViewFlags & VISIBILITY_MASK) == VISIBLE) { 2200 if (child.requestFocus(direction, previouslyFocusedRect)) { 2201 return true; 2202 } 2203 } 2204 } 2205 return false; 2206 } 2207 2208 /** 2209 * {@inheritDoc} 2210 * 2211 * @hide 2212 */ 2213 @Override 2214 public void dispatchStartTemporaryDetach() { 2215 super.dispatchStartTemporaryDetach(); 2216 final int count = mChildrenCount; 2217 final View[] children = mChildren; 2218 for (int i = 0; i < count; i++) { 2219 children[i].dispatchStartTemporaryDetach(); 2220 } 2221 } 2222 2223 /** 2224 * {@inheritDoc} 2225 * 2226 * @hide 2227 */ 2228 @Override 2229 public void dispatchFinishTemporaryDetach() { 2230 super.dispatchFinishTemporaryDetach(); 2231 final int count = mChildrenCount; 2232 final View[] children = mChildren; 2233 for (int i = 0; i < count; i++) { 2234 children[i].dispatchFinishTemporaryDetach(); 2235 } 2236 } 2237 2238 /** 2239 * {@inheritDoc} 2240 */ 2241 @Override 2242 void dispatchAttachedToWindow(AttachInfo info, int visibility) { 2243 mGroupFlags |= FLAG_PREVENT_DISPATCH_ATTACHED_TO_WINDOW; 2244 super.dispatchAttachedToWindow(info, visibility); 2245 mGroupFlags &= ~FLAG_PREVENT_DISPATCH_ATTACHED_TO_WINDOW; 2246 2247 visibility |= mViewFlags & VISIBILITY_MASK; 2248 2249 final int count = mChildrenCount; 2250 final View[] children = mChildren; 2251 for (int i = 0; i < count; i++) { 2252 children[i].dispatchAttachedToWindow(info, visibility); 2253 } 2254 } 2255 2256 @Override 2257 boolean dispatchPopulateAccessibilityEventInternal(AccessibilityEvent event) { 2258 boolean handled = super.dispatchPopulateAccessibilityEventInternal(event); 2259 if (handled) { 2260 return handled; 2261 } 2262 // Let our children have a shot in populating the event. 2263 for (int i = 0, count = getChildCount(); i < count; i++) { 2264 View child = getChildAt(i); 2265 if ((child.mViewFlags & VISIBILITY_MASK) == VISIBLE) { 2266 handled = getChildAt(i).dispatchPopulateAccessibilityEvent(event); 2267 if (handled) { 2268 return handled; 2269 } 2270 } 2271 } 2272 return false; 2273 } 2274 2275 @Override 2276 void onInitializeAccessibilityNodeInfoInternal(AccessibilityNodeInfo info) { 2277 super.onInitializeAccessibilityNodeInfoInternal(info); 2278 info.setClassName(ViewGroup.class.getName()); 2279 for (int i = 0, count = mChildrenCount; i < count; i++) { 2280 View child = mChildren[i]; 2281 if ((child.mViewFlags & VISIBILITY_MASK) == VISIBLE 2282 && (child.mPrivateFlags & IS_ROOT_NAMESPACE) == 0) { 2283 info.addChild(child); 2284 } 2285 } 2286 } 2287 2288 @Override 2289 void onInitializeAccessibilityEventInternal(AccessibilityEvent event) { 2290 super.onInitializeAccessibilityEventInternal(event); 2291 event.setClassName(ViewGroup.class.getName()); 2292 } 2293 2294 /** 2295 * {@inheritDoc} 2296 */ 2297 @Override 2298 void dispatchDetachedFromWindow() { 2299 // If we still have a touch target, we are still in the process of 2300 // dispatching motion events to a child; we need to get rid of that 2301 // child to avoid dispatching events to it after the window is torn 2302 // down. To make sure we keep the child in a consistent state, we 2303 // first send it an ACTION_CANCEL motion event. 2304 cancelAndClearTouchTargets(null); 2305 2306 // In case view is detached while transition is running 2307 mLayoutSuppressed = false; 2308 2309 // Tear down our drag tracking 2310 mDragNotifiedChildren = null; 2311 if (mCurrentDrag != null) { 2312 mCurrentDrag.recycle(); 2313 mCurrentDrag = null; 2314 } 2315 2316 final int count = mChildrenCount; 2317 final View[] children = mChildren; 2318 for (int i = 0; i < count; i++) { 2319 children[i].dispatchDetachedFromWindow(); 2320 } 2321 super.dispatchDetachedFromWindow(); 2322 } 2323 2324 /** 2325 * {@inheritDoc} 2326 */ 2327 @Override 2328 public void setPadding(int left, int top, int right, int bottom) { 2329 super.setPadding(left, top, right, bottom); 2330 2331 if ((mPaddingLeft | mPaddingTop | mPaddingRight | mPaddingBottom) != 0) { 2332 mGroupFlags |= FLAG_PADDING_NOT_NULL; 2333 } else { 2334 mGroupFlags &= ~FLAG_PADDING_NOT_NULL; 2335 } 2336 } 2337 2338 /** 2339 * {@inheritDoc} 2340 */ 2341 @Override 2342 protected void dispatchSaveInstanceState(SparseArray<Parcelable> container) { 2343 super.dispatchSaveInstanceState(container); 2344 final int count = mChildrenCount; 2345 final View[] children = mChildren; 2346 for (int i = 0; i < count; i++) { 2347 View c = children[i]; 2348 if ((c.mViewFlags & PARENT_SAVE_DISABLED_MASK) != PARENT_SAVE_DISABLED) { 2349 c.dispatchSaveInstanceState(container); 2350 } 2351 } 2352 } 2353 2354 /** 2355 * Perform dispatching of a {@link #saveHierarchyState(android.util.SparseArray)} freeze()} 2356 * to only this view, not to its children. For use when overriding 2357 * {@link #dispatchSaveInstanceState(android.util.SparseArray)} dispatchFreeze()} to allow 2358 * subclasses to freeze their own state but not the state of their children. 2359 * 2360 * @param container the container 2361 */ 2362 protected void dispatchFreezeSelfOnly(SparseArray<Parcelable> container) { 2363 super.dispatchSaveInstanceState(container); 2364 } 2365 2366 /** 2367 * {@inheritDoc} 2368 */ 2369 @Override 2370 protected void dispatchRestoreInstanceState(SparseArray<Parcelable> container) { 2371 super.dispatchRestoreInstanceState(container); 2372 final int count = mChildrenCount; 2373 final View[] children = mChildren; 2374 for (int i = 0; i < count; i++) { 2375 View c = children[i]; 2376 if ((c.mViewFlags & PARENT_SAVE_DISABLED_MASK) != PARENT_SAVE_DISABLED) { 2377 c.dispatchRestoreInstanceState(container); 2378 } 2379 } 2380 } 2381 2382 /** 2383 * Perform dispatching of a {@link #restoreHierarchyState(android.util.SparseArray)} 2384 * to only this view, not to its children. For use when overriding 2385 * {@link #dispatchRestoreInstanceState(android.util.SparseArray)} to allow 2386 * subclasses to thaw their own state but not the state of their children. 2387 * 2388 * @param container the container 2389 */ 2390 protected void dispatchThawSelfOnly(SparseArray<Parcelable> container) { 2391 super.dispatchRestoreInstanceState(container); 2392 } 2393 2394 /** 2395 * Enables or disables the drawing cache for each child of this view group. 2396 * 2397 * @param enabled true to enable the cache, false to dispose of it 2398 */ 2399 protected void setChildrenDrawingCacheEnabled(boolean enabled) { 2400 if (enabled || (mPersistentDrawingCache & PERSISTENT_ALL_CACHES) != PERSISTENT_ALL_CACHES) { 2401 final View[] children = mChildren; 2402 final int count = mChildrenCount; 2403 for (int i = 0; i < count; i++) { 2404 children[i].setDrawingCacheEnabled(enabled); 2405 } 2406 } 2407 } 2408 2409 @Override 2410 protected void onAnimationStart() { 2411 super.onAnimationStart(); 2412 2413 // When this ViewGroup's animation starts, build the cache for the children 2414 if ((mGroupFlags & FLAG_ANIMATION_CACHE) == FLAG_ANIMATION_CACHE) { 2415 final int count = mChildrenCount; 2416 final View[] children = mChildren; 2417 final boolean buildCache = !isHardwareAccelerated(); 2418 2419 for (int i = 0; i < count; i++) { 2420 final View child = children[i]; 2421 if ((child.mViewFlags & VISIBILITY_MASK) == VISIBLE) { 2422 child.setDrawingCacheEnabled(true); 2423 if (buildCache) { 2424 child.buildDrawingCache(true); 2425 } 2426 } 2427 } 2428 2429 mGroupFlags |= FLAG_CHILDREN_DRAWN_WITH_CACHE; 2430 } 2431 } 2432 2433 @Override 2434 protected void onAnimationEnd() { 2435 super.onAnimationEnd(); 2436 2437 // When this ViewGroup's animation ends, destroy the cache of the children 2438 if ((mGroupFlags & FLAG_ANIMATION_CACHE) == FLAG_ANIMATION_CACHE) { 2439 mGroupFlags &= ~FLAG_CHILDREN_DRAWN_WITH_CACHE; 2440 2441 if ((mPersistentDrawingCache & PERSISTENT_ANIMATION_CACHE) == 0) { 2442 setChildrenDrawingCacheEnabled(false); 2443 } 2444 } 2445 } 2446 2447 @Override 2448 Bitmap createSnapshot(Bitmap.Config quality, int backgroundColor, boolean skipChildren) { 2449 int count = mChildrenCount; 2450 int[] visibilities = null; 2451 2452 if (skipChildren) { 2453 visibilities = new int[count]; 2454 for (int i = 0; i < count; i++) { 2455 View child = getChildAt(i); 2456 visibilities[i] = child.getVisibility(); 2457 if (visibilities[i] == View.VISIBLE) { 2458 child.setVisibility(INVISIBLE); 2459 } 2460 } 2461 } 2462 2463 Bitmap b = super.createSnapshot(quality, backgroundColor, skipChildren); 2464 2465 if (skipChildren) { 2466 for (int i = 0; i < count; i++) { 2467 getChildAt(i).setVisibility(visibilities[i]); 2468 } 2469 } 2470 2471 return b; 2472 } 2473 2474 /** 2475 * {@inheritDoc} 2476 */ 2477 @Override 2478 protected void dispatchDraw(Canvas canvas) { 2479 final int count = mChildrenCount; 2480 final View[] children = mChildren; 2481 int flags = mGroupFlags; 2482 2483 if ((flags & FLAG_RUN_ANIMATION) != 0 && canAnimate()) { 2484 final boolean cache = (mGroupFlags & FLAG_ANIMATION_CACHE) == FLAG_ANIMATION_CACHE; 2485 2486 final boolean buildCache = !isHardwareAccelerated(); 2487 for (int i = 0; i < count; i++) { 2488 final View child = children[i]; 2489 if ((child.mViewFlags & VISIBILITY_MASK) == VISIBLE) { 2490 final LayoutParams params = child.getLayoutParams(); 2491 attachLayoutAnimationParameters(child, params, i, count); 2492 bindLayoutAnimation(child); 2493 if (cache) { 2494 child.setDrawingCacheEnabled(true); 2495 if (buildCache) { 2496 child.buildDrawingCache(true); 2497 } 2498 } 2499 } 2500 } 2501 2502 final LayoutAnimationController controller = mLayoutAnimationController; 2503 if (controller.willOverlap()) { 2504 mGroupFlags |= FLAG_OPTIMIZE_INVALIDATE; 2505 } 2506 2507 controller.start(); 2508 2509 mGroupFlags &= ~FLAG_RUN_ANIMATION; 2510 mGroupFlags &= ~FLAG_ANIMATION_DONE; 2511 2512 if (cache) { 2513 mGroupFlags |= FLAG_CHILDREN_DRAWN_WITH_CACHE; 2514 } 2515 2516 if (mAnimationListener != null) { 2517 mAnimationListener.onAnimationStart(controller.getAnimation()); 2518 } 2519 } 2520 2521 int saveCount = 0; 2522 final boolean clipToPadding = (flags & CLIP_TO_PADDING_MASK) == CLIP_TO_PADDING_MASK; 2523 if (clipToPadding) { 2524 saveCount = canvas.save(); 2525 canvas.clipRect(mScrollX + mPaddingLeft, mScrollY + mPaddingTop, 2526 mScrollX + mRight - mLeft - mPaddingRight, 2527 mScrollY + mBottom - mTop - mPaddingBottom); 2528 2529 } 2530 2531 // We will draw our child's animation, let's reset the flag 2532 mPrivateFlags &= ~DRAW_ANIMATION; 2533 mGroupFlags &= ~FLAG_INVALIDATE_REQUIRED; 2534 2535 boolean more = false; 2536 final long drawingTime = getDrawingTime(); 2537 2538 if ((flags & FLAG_USE_CHILD_DRAWING_ORDER) == 0) { 2539 for (int i = 0; i < count; i++) { 2540 final View child = children[i]; 2541 if ((child.mViewFlags & VISIBILITY_MASK) == VISIBLE || child.getAnimation() != null) { 2542 more |= drawChild(canvas, child, drawingTime); 2543 } 2544 } 2545 } else { 2546 for (int i = 0; i < count; i++) { 2547 final View child = children[getChildDrawingOrder(count, i)]; 2548 if ((child.mViewFlags & VISIBILITY_MASK) == VISIBLE || child.getAnimation() != null) { 2549 more |= drawChild(canvas, child, drawingTime); 2550 } 2551 } 2552 } 2553 2554 // Draw any disappearing views that have animations 2555 if (mDisappearingChildren != null) { 2556 final ArrayList<View> disappearingChildren = mDisappearingChildren; 2557 final int disappearingCount = disappearingChildren.size() - 1; 2558 // Go backwards -- we may delete as animations finish 2559 for (int i = disappearingCount; i >= 0; i--) { 2560 final View child = disappearingChildren.get(i); 2561 more |= drawChild(canvas, child, drawingTime); 2562 } 2563 } 2564 2565 if (clipToPadding) { 2566 canvas.restoreToCount(saveCount); 2567 } 2568 2569 // mGroupFlags might have been updated by drawChild() 2570 flags = mGroupFlags; 2571 2572 if ((flags & FLAG_INVALIDATE_REQUIRED) == FLAG_INVALIDATE_REQUIRED) { 2573 invalidate(true); 2574 } 2575 2576 if ((flags & FLAG_ANIMATION_DONE) == 0 && (flags & FLAG_NOTIFY_ANIMATION_LISTENER) == 0 && 2577 mLayoutAnimationController.isDone() && !more) { 2578 // We want to erase the drawing cache and notify the listener after the 2579 // next frame is drawn because one extra invalidate() is caused by 2580 // drawChild() after the animation is over 2581 mGroupFlags |= FLAG_NOTIFY_ANIMATION_LISTENER; 2582 final Runnable end = new Runnable() { 2583 public void run() { 2584 notifyAnimationListener(); 2585 } 2586 }; 2587 post(end); 2588 } 2589 } 2590 2591 /** 2592 * Returns the index of the child to draw for this iteration. Override this 2593 * if you want to change the drawing order of children. By default, it 2594 * returns i. 2595 * <p> 2596 * NOTE: In order for this method to be called, you must enable child ordering 2597 * first by calling {@link #setChildrenDrawingOrderEnabled(boolean)}. 2598 * 2599 * @param i The current iteration. 2600 * @return The index of the child to draw this iteration. 2601 * 2602 * @see #setChildrenDrawingOrderEnabled(boolean) 2603 * @see #isChildrenDrawingOrderEnabled() 2604 */ 2605 protected int getChildDrawingOrder(int childCount, int i) { 2606 return i; 2607 } 2608 2609 private void notifyAnimationListener() { 2610 mGroupFlags &= ~FLAG_NOTIFY_ANIMATION_LISTENER; 2611 mGroupFlags |= FLAG_ANIMATION_DONE; 2612 2613 if (mAnimationListener != null) { 2614 final Runnable end = new Runnable() { 2615 public void run() { 2616 mAnimationListener.onAnimationEnd(mLayoutAnimationController.getAnimation()); 2617 } 2618 }; 2619 post(end); 2620 } 2621 2622 if ((mGroupFlags & FLAG_ANIMATION_CACHE) == FLAG_ANIMATION_CACHE) { 2623 mGroupFlags &= ~FLAG_CHILDREN_DRAWN_WITH_CACHE; 2624 if ((mPersistentDrawingCache & PERSISTENT_ANIMATION_CACHE) == 0) { 2625 setChildrenDrawingCacheEnabled(false); 2626 } 2627 } 2628 2629 invalidate(true); 2630 } 2631 2632 /** 2633 * This method is used to cause children of this ViewGroup to restore or recreate their 2634 * display lists. It is called by getDisplayList() when the parent ViewGroup does not need 2635 * to recreate its own display list, which would happen if it went through the normal 2636 * draw/dispatchDraw mechanisms. 2637 * 2638 * @hide 2639 */ 2640 @Override 2641 protected void dispatchGetDisplayList() { 2642 final int count = mChildrenCount; 2643 final View[] children = mChildren; 2644 for (int i = 0; i < count; i++) { 2645 final View child = children[i]; 2646 if (((child.mViewFlags & VISIBILITY_MASK) == VISIBLE || child.getAnimation() != null) && 2647 child.hasStaticLayer()) { 2648 child.mRecreateDisplayList = (child.mPrivateFlags & INVALIDATED) == INVALIDATED; 2649 child.mPrivateFlags &= ~INVALIDATED; 2650 child.getDisplayList(); 2651 child.mRecreateDisplayList = false; 2652 } 2653 } 2654 } 2655 2656 /** 2657 * Draw one child of this View Group. This method is responsible for getting 2658 * the canvas in the right state. This includes clipping, translating so 2659 * that the child's scrolled origin is at 0, 0, and applying any animation 2660 * transformations. 2661 * 2662 * @param canvas The canvas on which to draw the child 2663 * @param child Who to draw 2664 * @param drawingTime The time at which draw is occurring 2665 * @return True if an invalidate() was issued 2666 */ 2667 protected boolean drawChild(Canvas canvas, View child, long drawingTime) { 2668 return child.draw(canvas, this, drawingTime); 2669 } 2670 2671 @Override 2672 public void requestLayout() { 2673 if (mChildrenCount > 0 && getAccessibilityNodeProvider() != null) { 2674 throw new IllegalStateException("Views with AccessibilityNodeProvider" 2675 + " can't have children."); 2676 } 2677 super.requestLayout(); 2678 } 2679 2680 /** 2681 * 2682 * @param enabled True if children should be drawn with layers, false otherwise. 2683 * 2684 * @hide 2685 */ 2686 public void setChildrenLayersEnabled(boolean enabled) { 2687 if (enabled != mDrawLayers) { 2688 mDrawLayers = enabled; 2689 invalidate(true); 2690 2691 boolean flushLayers = !enabled; 2692 AttachInfo info = mAttachInfo; 2693 if (info != null && info.mHardwareRenderer != null && 2694 info.mHardwareRenderer.isEnabled()) { 2695 if (!info.mHardwareRenderer.validate()) { 2696 flushLayers = false; 2697 } 2698 } else { 2699 flushLayers = false; 2700 } 2701 2702 // We need to invalidate any child with a layer. For instance, 2703 // if a child is backed by a hardware layer and we disable layers 2704 // the child is marked as not dirty (flags cleared the last time 2705 // the child was drawn inside its layer.) However, that child might 2706 // never have created its own display list or have an obsolete 2707 // display list. By invalidating the child we ensure the display 2708 // list is in sync with the content of the hardware layer. 2709 for (int i = 0; i < mChildrenCount; i++) { 2710 View child = mChildren[i]; 2711 if (child.mLayerType != LAYER_TYPE_NONE) { 2712 if (flushLayers) child.flushLayer(); 2713 child.invalidate(true); 2714 } 2715 } 2716 } 2717 } 2718 2719 /** 2720 * By default, children are clipped to their bounds before drawing. This 2721 * allows view groups to override this behavior for animations, etc. 2722 * 2723 * @param clipChildren true to clip children to their bounds, 2724 * false otherwise 2725 * @attr ref android.R.styleable#ViewGroup_clipChildren 2726 */ 2727 public void setClipChildren(boolean clipChildren) { 2728 setBooleanFlag(FLAG_CLIP_CHILDREN, clipChildren); 2729 } 2730 2731 /** 2732 * By default, children are clipped to the padding of the ViewGroup. This 2733 * allows view groups to override this behavior 2734 * 2735 * @param clipToPadding true to clip children to the padding of the 2736 * group, false otherwise 2737 * @attr ref android.R.styleable#ViewGroup_clipToPadding 2738 */ 2739 public void setClipToPadding(boolean clipToPadding) { 2740 setBooleanFlag(FLAG_CLIP_TO_PADDING, clipToPadding); 2741 } 2742 2743 /** 2744 * {@inheritDoc} 2745 */ 2746 @Override 2747 public void dispatchSetSelected(boolean selected) { 2748 final View[] children = mChildren; 2749 final int count = mChildrenCount; 2750 for (int i = 0; i < count; i++) { 2751 children[i].setSelected(selected); 2752 } 2753 } 2754 2755 /** 2756 * {@inheritDoc} 2757 */ 2758 @Override 2759 public void dispatchSetActivated(boolean activated) { 2760 final View[] children = mChildren; 2761 final int count = mChildrenCount; 2762 for (int i = 0; i < count; i++) { 2763 children[i].setActivated(activated); 2764 } 2765 } 2766 2767 @Override 2768 protected void dispatchSetPressed(boolean pressed) { 2769 final View[] children = mChildren; 2770 final int count = mChildrenCount; 2771 for (int i = 0; i < count; i++) { 2772 final View child = children[i]; 2773 // Children that are clickable on their own should not 2774 // show a pressed state when their parent view does. 2775 // Clearing a pressed state always propagates. 2776 if (!pressed || (!child.isClickable() && !child.isLongClickable())) { 2777 child.setPressed(pressed); 2778 } 2779 } 2780 } 2781 2782 /** 2783 * When this property is set to true, this ViewGroup supports static transformations on 2784 * children; this causes 2785 * {@link #getChildStaticTransformation(View, android.view.animation.Transformation)} to be 2786 * invoked when a child is drawn. 2787 * 2788 * Any subclass overriding 2789 * {@link #getChildStaticTransformation(View, android.view.animation.Transformation)} should 2790 * set this property to true. 2791 * 2792 * @param enabled True to enable static transformations on children, false otherwise. 2793 * 2794 * @see #FLAG_SUPPORT_STATIC_TRANSFORMATIONS 2795 */ 2796 protected void setStaticTransformationsEnabled(boolean enabled) { 2797 setBooleanFlag(FLAG_SUPPORT_STATIC_TRANSFORMATIONS, enabled); 2798 } 2799 2800 /** 2801 * Sets <code>t</code> to be the static transformation of the child, if set, returning a 2802 * boolean to indicate whether a static transform was set. The default implementation 2803 * simply returns <code>false</code>; subclasses may override this method for different 2804 * behavior. 2805 * 2806 * @param child The child view whose static transform is being requested 2807 * @param t The Transformation which will hold the result 2808 * @return true if the transformation was set, false otherwise 2809 * @see #setStaticTransformationsEnabled(boolean) 2810 */ 2811 protected boolean getChildStaticTransformation(View child, Transformation t) { 2812 return false; 2813 } 2814 2815 /** 2816 * {@hide} 2817 */ 2818 @Override 2819 protected View findViewTraversal(int id) { 2820 if (id == mID) { 2821 return this; 2822 } 2823 2824 final View[] where = mChildren; 2825 final int len = mChildrenCount; 2826 2827 for (int i = 0; i < len; i++) { 2828 View v = where[i]; 2829 2830 if ((v.mPrivateFlags & IS_ROOT_NAMESPACE) == 0) { 2831 v = v.findViewById(id); 2832 2833 if (v != null) { 2834 return v; 2835 } 2836 } 2837 } 2838 2839 return null; 2840 } 2841 2842 /** 2843 * {@hide} 2844 */ 2845 @Override 2846 protected View findViewWithTagTraversal(Object tag) { 2847 if (tag != null && tag.equals(mTag)) { 2848 return this; 2849 } 2850 2851 final View[] where = mChildren; 2852 final int len = mChildrenCount; 2853 2854 for (int i = 0; i < len; i++) { 2855 View v = where[i]; 2856 2857 if ((v.mPrivateFlags & IS_ROOT_NAMESPACE) == 0) { 2858 v = v.findViewWithTag(tag); 2859 2860 if (v != null) { 2861 return v; 2862 } 2863 } 2864 } 2865 2866 return null; 2867 } 2868 2869 /** 2870 * {@hide} 2871 */ 2872 @Override 2873 protected View findViewByPredicateTraversal(Predicate<View> predicate, View childToSkip) { 2874 if (predicate.apply(this)) { 2875 return this; 2876 } 2877 2878 final View[] where = mChildren; 2879 final int len = mChildrenCount; 2880 2881 for (int i = 0; i < len; i++) { 2882 View v = where[i]; 2883 2884 if (v != childToSkip && (v.mPrivateFlags & IS_ROOT_NAMESPACE) == 0) { 2885 v = v.findViewByPredicate(predicate); 2886 2887 if (v != null) { 2888 return v; 2889 } 2890 } 2891 } 2892 2893 return null; 2894 } 2895 2896 /** 2897 * Adds a child view. If no layout parameters are already set on the child, the 2898 * default parameters for this ViewGroup are set on the child. 2899 * 2900 * @param child the child view to add 2901 * 2902 * @see #generateDefaultLayoutParams() 2903 */ 2904 public void addView(View child) { 2905 addView(child, -1); 2906 } 2907 2908 /** 2909 * Adds a child view. If no layout parameters are already set on the child, the 2910 * default parameters for this ViewGroup are set on the child. 2911 * 2912 * @param child the child view to add 2913 * @param index the position at which to add the child 2914 * 2915 * @see #generateDefaultLayoutParams() 2916 */ 2917 public void addView(View child, int index) { 2918 LayoutParams params = child.getLayoutParams(); 2919 if (params == null) { 2920 params = generateDefaultLayoutParams(); 2921 if (params == null) { 2922 throw new IllegalArgumentException("generateDefaultLayoutParams() cannot return null"); 2923 } 2924 } 2925 addView(child, index, params); 2926 } 2927 2928 /** 2929 * Adds a child view with this ViewGroup's default layout parameters and the 2930 * specified width and height. 2931 * 2932 * @param child the child view to add 2933 */ 2934 public void addView(View child, int width, int height) { 2935 final LayoutParams params = generateDefaultLayoutParams(); 2936 params.width = width; 2937 params.height = height; 2938 addView(child, -1, params); 2939 } 2940 2941 /** 2942 * Adds a child view with the specified layout parameters. 2943 * 2944 * @param child the child view to add 2945 * @param params the layout parameters to set on the child 2946 */ 2947 public void addView(View child, LayoutParams params) { 2948 addView(child, -1, params); 2949 } 2950 2951 /** 2952 * Adds a child view with the specified layout parameters. 2953 * 2954 * @param child the child view to add 2955 * @param index the position at which to add the child 2956 * @param params the layout parameters to set on the child 2957 */ 2958 public void addView(View child, int index, LayoutParams params) { 2959 if (DBG) { 2960 System.out.println(this + " addView"); 2961 } 2962 2963 // addViewInner() will call child.requestLayout() when setting the new LayoutParams 2964 // therefore, we call requestLayout() on ourselves before, so that the child's request 2965 // will be blocked at our level 2966 requestLayout(); 2967 invalidate(true); 2968 addViewInner(child, index, params, false); 2969 } 2970 2971 /** 2972 * {@inheritDoc} 2973 */ 2974 public void updateViewLayout(View view, ViewGroup.LayoutParams params) { 2975 if (!checkLayoutParams(params)) { 2976 throw new IllegalArgumentException("Invalid LayoutParams supplied to " + this); 2977 } 2978 if (view.mParent != this) { 2979 throw new IllegalArgumentException("Given view not a child of " + this); 2980 } 2981 view.setLayoutParams(params); 2982 } 2983 2984 /** 2985 * {@inheritDoc} 2986 */ 2987 protected boolean checkLayoutParams(ViewGroup.LayoutParams p) { 2988 return p != null; 2989 } 2990 2991 /** 2992 * Interface definition for a callback to be invoked when the hierarchy 2993 * within this view changed. The hierarchy changes whenever a child is added 2994 * to or removed from this view. 2995 */ 2996 public interface OnHierarchyChangeListener { 2997 /** 2998 * Called when a new child is added to a parent view. 2999 * 3000 * @param parent the view in which a child was added 3001 * @param child the new child view added in the hierarchy 3002 */ 3003 void onChildViewAdded(View parent, View child); 3004 3005 /** 3006 * Called when a child is removed from a parent view. 3007 * 3008 * @param parent the view from which the child was removed 3009 * @param child the child removed from the hierarchy 3010 */ 3011 void onChildViewRemoved(View parent, View child); 3012 } 3013 3014 /** 3015 * Register a callback to be invoked when a child is added to or removed 3016 * from this view. 3017 * 3018 * @param listener the callback to invoke on hierarchy change 3019 */ 3020 public void setOnHierarchyChangeListener(OnHierarchyChangeListener listener) { 3021 mOnHierarchyChangeListener = listener; 3022 } 3023 3024 /** 3025 * @hide 3026 */ 3027 protected void onViewAdded(View child) { 3028 if (mOnHierarchyChangeListener != null) { 3029 mOnHierarchyChangeListener.onChildViewAdded(this, child); 3030 } 3031 } 3032 3033 /** 3034 * @hide 3035 */ 3036 protected void onViewRemoved(View child) { 3037 if (mOnHierarchyChangeListener != null) { 3038 mOnHierarchyChangeListener.onChildViewRemoved(this, child); 3039 } 3040 } 3041 3042 /** 3043 * Adds a view during layout. This is useful if in your onLayout() method, 3044 * you need to add more views (as does the list view for example). 3045 * 3046 * If index is negative, it means put it at the end of the list. 3047 * 3048 * @param child the view to add to the group 3049 * @param index the index at which the child must be added 3050 * @param params the layout parameters to associate with the child 3051 * @return true if the child was added, false otherwise 3052 */ 3053 protected boolean addViewInLayout(View child, int index, LayoutParams params) { 3054 return addViewInLayout(child, index, params, false); 3055 } 3056 3057 /** 3058 * Adds a view during layout. This is useful if in your onLayout() method, 3059 * you need to add more views (as does the list view for example). 3060 * 3061 * If index is negative, it means put it at the end of the list. 3062 * 3063 * @param child the view to add to the group 3064 * @param index the index at which the child must be added 3065 * @param params the layout parameters to associate with the child 3066 * @param preventRequestLayout if true, calling this method will not trigger a 3067 * layout request on child 3068 * @return true if the child was added, false otherwise 3069 */ 3070 protected boolean addViewInLayout(View child, int index, LayoutParams params, 3071 boolean preventRequestLayout) { 3072 child.mParent = null; 3073 addViewInner(child, index, params, preventRequestLayout); 3074 child.mPrivateFlags = (child.mPrivateFlags & ~DIRTY_MASK) | DRAWN; 3075 return true; 3076 } 3077 3078 /** 3079 * Prevents the specified child to be laid out during the next layout pass. 3080 * 3081 * @param child the child on which to perform the cleanup 3082 */ 3083 protected void cleanupLayoutState(View child) { 3084 child.mPrivateFlags &= ~View.FORCE_LAYOUT; 3085 } 3086 3087 private void addViewInner(View child, int index, LayoutParams params, 3088 boolean preventRequestLayout) { 3089 3090 if (getAccessibilityNodeProvider() != null) { 3091 throw new IllegalStateException("Views with AccessibilityNodeProvider" 3092 + " can't have children."); 3093 } 3094 3095 if (mTransition != null) { 3096 // Don't prevent other add transitions from completing, but cancel remove 3097 // transitions to let them complete the process before we add to the container 3098 mTransition.cancel(LayoutTransition.DISAPPEARING); 3099 } 3100 3101 if (child.getParent() != null) { 3102 throw new IllegalStateException("The specified child already has a parent. " + 3103 "You must call removeView() on the child's parent first."); 3104 } 3105 3106 if (mTransition != null) { 3107 mTransition.addChild(this, child); 3108 } 3109 3110 if (!checkLayoutParams(params)) { 3111 params = generateLayoutParams(params); 3112 } 3113 3114 if (preventRequestLayout) { 3115 child.mLayoutParams = params; 3116 } else { 3117 child.setLayoutParams(params); 3118 } 3119 3120 if (index < 0) { 3121 index = mChildrenCount; 3122 } 3123 3124 addInArray(child, index); 3125 3126 // tell our children 3127 if (preventRequestLayout) { 3128 child.assignParent(this); 3129 } else { 3130 child.mParent = this; 3131 } 3132 3133 if (child.hasFocus()) { 3134 requestChildFocus(child, child.findFocus()); 3135 } 3136 3137 AttachInfo ai = mAttachInfo; 3138 if (ai != null && (mGroupFlags & FLAG_PREVENT_DISPATCH_ATTACHED_TO_WINDOW) == 0) { 3139 boolean lastKeepOn = ai.mKeepScreenOn; 3140 ai.mKeepScreenOn = false; 3141 child.dispatchAttachedToWindow(mAttachInfo, (mViewFlags&VISIBILITY_MASK)); 3142 if (ai.mKeepScreenOn) { 3143 needGlobalAttributesUpdate(true); 3144 } 3145 ai.mKeepScreenOn = lastKeepOn; 3146 } 3147 3148 onViewAdded(child); 3149 3150 if ((child.mViewFlags & DUPLICATE_PARENT_STATE) == DUPLICATE_PARENT_STATE) { 3151 mGroupFlags |= FLAG_NOTIFY_CHILDREN_ON_DRAWABLE_STATE_CHANGE; 3152 } 3153 3154 if (child.hasTransientState()) { 3155 childHasTransientStateChanged(child, true); 3156 } 3157 } 3158 3159 private void addInArray(View child, int index) { 3160 View[] children = mChildren; 3161 final int count = mChildrenCount; 3162 final int size = children.length; 3163 if (index == count) { 3164 if (size == count) { 3165 mChildren = new View[size + ARRAY_CAPACITY_INCREMENT]; 3166 System.arraycopy(children, 0, mChildren, 0, size); 3167 children = mChildren; 3168 } 3169 children[mChildrenCount++] = child; 3170 } else if (index < count) { 3171 if (size == count) { 3172 mChildren = new View[size + ARRAY_CAPACITY_INCREMENT]; 3173 System.arraycopy(children, 0, mChildren, 0, index); 3174 System.arraycopy(children, index, mChildren, index + 1, count - index); 3175 children = mChildren; 3176 } else { 3177 System.arraycopy(children, index, children, index + 1, count - index); 3178 } 3179 children[index] = child; 3180 mChildrenCount++; 3181 if (mLastTouchDownIndex >= index) { 3182 mLastTouchDownIndex++; 3183 } 3184 } else { 3185 throw new IndexOutOfBoundsException("index=" + index + " count=" + count); 3186 } 3187 } 3188 3189 // This method also sets the child's mParent to null 3190 private void removeFromArray(int index) { 3191 final View[] children = mChildren; 3192 if (!(mTransitioningViews != null && mTransitioningViews.contains(children[index]))) { 3193 children[index].mParent = null; 3194 } 3195 final int count = mChildrenCount; 3196 if (index == count - 1) { 3197 children[--mChildrenCount] = null; 3198 } else if (index >= 0 && index < count) { 3199 System.arraycopy(children, index + 1, children, index, count - index - 1); 3200 children[--mChildrenCount] = null; 3201 } else { 3202 throw new IndexOutOfBoundsException(); 3203 } 3204 if (mLastTouchDownIndex == index) { 3205 mLastTouchDownTime = 0; 3206 mLastTouchDownIndex = -1; 3207 } else if (mLastTouchDownIndex > index) { 3208 mLastTouchDownIndex--; 3209 } 3210 } 3211 3212 // This method also sets the children's mParent to null 3213 private void removeFromArray(int start, int count) { 3214 final View[] children = mChildren; 3215 final int childrenCount = mChildrenCount; 3216 3217 start = Math.max(0, start); 3218 final int end = Math.min(childrenCount, start + count); 3219 3220 if (start == end) { 3221 return; 3222 } 3223 3224 if (end == childrenCount) { 3225 for (int i = start; i < end; i++) { 3226 children[i].mParent = null; 3227 children[i] = null; 3228 } 3229 } else { 3230 for (int i = start; i < end; i++) { 3231 children[i].mParent = null; 3232 } 3233 3234 // Since we're looping above, we might as well do the copy, but is arraycopy() 3235 // faster than the extra 2 bounds checks we would do in the loop? 3236 System.arraycopy(children, end, children, start, childrenCount - end); 3237 3238 for (int i = childrenCount - (end - start); i < childrenCount; i++) { 3239 children[i] = null; 3240 } 3241 } 3242 3243 mChildrenCount -= (end - start); 3244 } 3245 3246 private void bindLayoutAnimation(View child) { 3247 Animation a = mLayoutAnimationController.getAnimationForView(child); 3248 child.setAnimation(a); 3249 } 3250 3251 /** 3252 * Subclasses should override this method to set layout animation 3253 * parameters on the supplied child. 3254 * 3255 * @param child the child to associate with animation parameters 3256 * @param params the child's layout parameters which hold the animation 3257 * parameters 3258 * @param index the index of the child in the view group 3259 * @param count the number of children in the view group 3260 */ 3261 protected void attachLayoutAnimationParameters(View child, 3262 LayoutParams params, int index, int count) { 3263 LayoutAnimationController.AnimationParameters animationParams = 3264 params.layoutAnimationParameters; 3265 if (animationParams == null) { 3266 animationParams = new LayoutAnimationController.AnimationParameters(); 3267 params.layoutAnimationParameters = animationParams; 3268 } 3269 3270 animationParams.count = count; 3271 animationParams.index = index; 3272 } 3273 3274 /** 3275 * {@inheritDoc} 3276 */ 3277 public void removeView(View view) { 3278 removeViewInternal(view); 3279 requestLayout(); 3280 invalidate(true); 3281 } 3282 3283 /** 3284 * Removes a view during layout. This is useful if in your onLayout() method, 3285 * you need to remove more views. 3286 * 3287 * @param view the view to remove from the group 3288 */ 3289 public void removeViewInLayout(View view) { 3290 removeViewInternal(view); 3291 } 3292 3293 /** 3294 * Removes a range of views during layout. This is useful if in your onLayout() method, 3295 * you need to remove more views. 3296 * 3297 * @param start the index of the first view to remove from the group 3298 * @param count the number of views to remove from the group 3299 */ 3300 public void removeViewsInLayout(int start, int count) { 3301 removeViewsInternal(start, count); 3302 } 3303 3304 /** 3305 * Removes the view at the specified position in the group. 3306 * 3307 * @param index the position in the group of the view to remove 3308 */ 3309 public void removeViewAt(int index) { 3310 removeViewInternal(index, getChildAt(index)); 3311 requestLayout(); 3312 invalidate(true); 3313 } 3314 3315 /** 3316 * Removes the specified range of views from the group. 3317 * 3318 * @param start the first position in the group of the range of views to remove 3319 * @param count the number of views to remove 3320 */ 3321 public void removeViews(int start, int count) { 3322 removeViewsInternal(start, count); 3323 requestLayout(); 3324 invalidate(true); 3325 } 3326 3327 private void removeViewInternal(View view) { 3328 final int index = indexOfChild(view); 3329 if (index >= 0) { 3330 removeViewInternal(index, view); 3331 } 3332 } 3333 3334 private void removeViewInternal(int index, View view) { 3335 3336 if (mTransition != null) { 3337 mTransition.removeChild(this, view); 3338 } 3339 3340 boolean clearChildFocus = false; 3341 if (view == mFocused) { 3342 view.clearFocusForRemoval(); 3343 clearChildFocus = true; 3344 } 3345 3346 if (view.getAnimation() != null || 3347 (mTransitioningViews != null && mTransitioningViews.contains(view))) { 3348 addDisappearingView(view); 3349 } else if (view.mAttachInfo != null) { 3350 view.dispatchDetachedFromWindow(); 3351 } 3352 3353 if (view.hasTransientState()) { 3354 childHasTransientStateChanged(view, false); 3355 } 3356 3357 onViewRemoved(view); 3358 3359 needGlobalAttributesUpdate(false); 3360 3361 removeFromArray(index); 3362 3363 if (clearChildFocus) { 3364 clearChildFocus(view); 3365 } 3366 } 3367 3368 /** 3369 * Sets the LayoutTransition object for this ViewGroup. If the LayoutTransition object is 3370 * not null, changes in layout which occur because of children being added to or removed from 3371 * the ViewGroup will be animated according to the animations defined in that LayoutTransition 3372 * object. By default, the transition object is null (so layout changes are not animated). 3373 * 3374 * @param transition The LayoutTransition object that will animated changes in layout. A value 3375 * of <code>null</code> means no transition will run on layout changes. 3376 * @attr ref android.R.styleable#ViewGroup_animateLayoutChanges 3377 */ 3378 public void setLayoutTransition(LayoutTransition transition) { 3379 if (mTransition != null) { 3380 mTransition.removeTransitionListener(mLayoutTransitionListener); 3381 } 3382 mTransition = transition; 3383 if (mTransition != null) { 3384 mTransition.addTransitionListener(mLayoutTransitionListener); 3385 } 3386 } 3387 3388 /** 3389 * Gets the LayoutTransition object for this ViewGroup. If the LayoutTransition object is 3390 * not null, changes in layout which occur because of children being added to or removed from 3391 * the ViewGroup will be animated according to the animations defined in that LayoutTransition 3392 * object. By default, the transition object is null (so layout changes are not animated). 3393 * 3394 * @return LayoutTranstion The LayoutTransition object that will animated changes in layout. 3395 * A value of <code>null</code> means no transition will run on layout changes. 3396 */ 3397 public LayoutTransition getLayoutTransition() { 3398 return mTransition; 3399 } 3400 3401 private void removeViewsInternal(int start, int count) { 3402 final View focused = mFocused; 3403 final boolean detach = mAttachInfo != null; 3404 View clearChildFocus = null; 3405 3406 final View[] children = mChildren; 3407 final int end = start + count; 3408 3409 for (int i = start; i < end; i++) { 3410 final View view = children[i]; 3411 3412 if (mTransition != null) { 3413 mTransition.removeChild(this, view); 3414 } 3415 3416 if (view == focused) { 3417 view.clearFocusForRemoval(); 3418 clearChildFocus = view; 3419 } 3420 3421 if (view.getAnimation() != null || 3422 (mTransitioningViews != null && mTransitioningViews.contains(view))) { 3423 addDisappearingView(view); 3424 } else if (detach) { 3425 view.dispatchDetachedFromWindow(); 3426 } 3427 3428 if (view.hasTransientState()) { 3429 childHasTransientStateChanged(view, false); 3430 } 3431 3432 needGlobalAttributesUpdate(false); 3433 3434 onViewRemoved(view); 3435 } 3436 3437 removeFromArray(start, count); 3438 3439 if (clearChildFocus != null) { 3440 clearChildFocus(clearChildFocus); 3441 } 3442 } 3443 3444 /** 3445 * Call this method to remove all child views from the 3446 * ViewGroup. 3447 */ 3448 public void removeAllViews() { 3449 removeAllViewsInLayout(); 3450 requestLayout(); 3451 invalidate(true); 3452 } 3453 3454 /** 3455 * Called by a ViewGroup subclass to remove child views from itself, 3456 * when it must first know its size on screen before it can calculate how many 3457 * child views it will render. An example is a Gallery or a ListView, which 3458 * may "have" 50 children, but actually only render the number of children 3459 * that can currently fit inside the object on screen. Do not call 3460 * this method unless you are extending ViewGroup and understand the 3461 * view measuring and layout pipeline. 3462 */ 3463 public void removeAllViewsInLayout() { 3464 final int count = mChildrenCount; 3465 if (count <= 0) { 3466 return; 3467 } 3468 3469 final View[] children = mChildren; 3470 mChildrenCount = 0; 3471 3472 final View focused = mFocused; 3473 final boolean detach = mAttachInfo != null; 3474 View clearChildFocus = null; 3475 3476 needGlobalAttributesUpdate(false); 3477 3478 for (int i = count - 1; i >= 0; i--) { 3479 final View view = children[i]; 3480 3481 if (mTransition != null) { 3482 mTransition.removeChild(this, view); 3483 } 3484 3485 if (view == focused) { 3486 view.clearFocusForRemoval(); 3487 clearChildFocus = view; 3488 } 3489 3490 if (view.getAnimation() != null || 3491 (mTransitioningViews != null && mTransitioningViews.contains(view))) { 3492 addDisappearingView(view); 3493 } else if (detach) { 3494 view.dispatchDetachedFromWindow(); 3495 } 3496 3497 if (view.hasTransientState()) { 3498 childHasTransientStateChanged(view, false); 3499 } 3500 3501 onViewRemoved(view); 3502 3503 view.mParent = null; 3504 children[i] = null; 3505 } 3506 3507 if (clearChildFocus != null) { 3508 clearChildFocus(clearChildFocus); 3509 } 3510 } 3511 3512 /** 3513 * Finishes the removal of a detached view. This method will dispatch the detached from 3514 * window event and notify the hierarchy change listener. 3515 * 3516 * @param child the child to be definitely removed from the view hierarchy 3517 * @param animate if true and the view has an animation, the view is placed in the 3518 * disappearing views list, otherwise, it is detached from the window 3519 * 3520 * @see #attachViewToParent(View, int, android.view.ViewGroup.LayoutParams) 3521 * @see #detachAllViewsFromParent() 3522 * @see #detachViewFromParent(View) 3523 * @see #detachViewFromParent(int) 3524 */ 3525 protected void removeDetachedView(View child, boolean animate) { 3526 if (mTransition != null) { 3527 mTransition.removeChild(this, child); 3528 } 3529 3530 if (child == mFocused) { 3531 child.clearFocus(); 3532 } 3533 3534 if ((animate && child.getAnimation() != null) || 3535 (mTransitioningViews != null && mTransitioningViews.contains(child))) { 3536 addDisappearingView(child); 3537 } else if (child.mAttachInfo != null) { 3538 child.dispatchDetachedFromWindow(); 3539 } 3540 3541 if (child.hasTransientState()) { 3542 childHasTransientStateChanged(child, false); 3543 } 3544 3545 onViewRemoved(child); 3546 } 3547 3548 /** 3549 * Attaches a view to this view group. Attaching a view assigns this group as the parent, 3550 * sets the layout parameters and puts the view in the list of children so it can be retrieved 3551 * by calling {@link #getChildAt(int)}. 3552 * 3553 * This method should be called only for view which were detached from their parent. 3554 * 3555 * @param child the child to attach 3556 * @param index the index at which the child should be attached 3557 * @param params the layout parameters of the child 3558 * 3559 * @see #removeDetachedView(View, boolean) 3560 * @see #detachAllViewsFromParent() 3561 * @see #detachViewFromParent(View) 3562 * @see #detachViewFromParent(int) 3563 */ 3564 protected void attachViewToParent(View child, int index, LayoutParams params) { 3565 child.mLayoutParams = params; 3566 3567 if (index < 0) { 3568 index = mChildrenCount; 3569 } 3570 3571 addInArray(child, index); 3572 3573 child.mParent = this; 3574 child.mPrivateFlags = (child.mPrivateFlags & ~DIRTY_MASK & ~DRAWING_CACHE_VALID) | 3575 DRAWN | INVALIDATED; 3576 this.mPrivateFlags |= INVALIDATED; 3577 3578 if (child.hasFocus()) { 3579 requestChildFocus(child, child.findFocus()); 3580 } 3581 } 3582 3583 /** 3584 * Detaches a view from its parent. Detaching a view should be temporary and followed 3585 * either by a call to {@link #attachViewToParent(View, int, android.view.ViewGroup.LayoutParams)} 3586 * or a call to {@link #removeDetachedView(View, boolean)}. When a view is detached, 3587 * its parent is null and cannot be retrieved by a call to {@link #getChildAt(int)}. 3588 * 3589 * @param child the child to detach 3590 * 3591 * @see #detachViewFromParent(int) 3592 * @see #detachViewsFromParent(int, int) 3593 * @see #detachAllViewsFromParent() 3594 * @see #attachViewToParent(View, int, android.view.ViewGroup.LayoutParams) 3595 * @see #removeDetachedView(View, boolean) 3596 */ 3597 protected void detachViewFromParent(View child) { 3598 removeFromArray(indexOfChild(child)); 3599 } 3600 3601 /** 3602 * Detaches a view from its parent. Detaching a view should be temporary and followed 3603 * either by a call to {@link #attachViewToParent(View, int, android.view.ViewGroup.LayoutParams)} 3604 * or a call to {@link #removeDetachedView(View, boolean)}. When a view is detached, 3605 * its parent is null and cannot be retrieved by a call to {@link #getChildAt(int)}. 3606 * 3607 * @param index the index of the child to detach 3608 * 3609 * @see #detachViewFromParent(View) 3610 * @see #detachAllViewsFromParent() 3611 * @see #detachViewsFromParent(int, int) 3612 * @see #attachViewToParent(View, int, android.view.ViewGroup.LayoutParams) 3613 * @see #removeDetachedView(View, boolean) 3614 */ 3615 protected void detachViewFromParent(int index) { 3616 removeFromArray(index); 3617 } 3618 3619 /** 3620 * Detaches a range of view from their parent. Detaching a view should be temporary and followed 3621 * either by a call to {@link #attachViewToParent(View, int, android.view.ViewGroup.LayoutParams)} 3622 * or a call to {@link #removeDetachedView(View, boolean)}. When a view is detached, its 3623 * parent is null and cannot be retrieved by a call to {@link #getChildAt(int)}. 3624 * 3625 * @param start the first index of the childrend range to detach 3626 * @param count the number of children to detach 3627 * 3628 * @see #detachViewFromParent(View) 3629 * @see #detachViewFromParent(int) 3630 * @see #detachAllViewsFromParent() 3631 * @see #attachViewToParent(View, int, android.view.ViewGroup.LayoutParams) 3632 * @see #removeDetachedView(View, boolean) 3633 */ 3634 protected void detachViewsFromParent(int start, int count) { 3635 removeFromArray(start, count); 3636 } 3637 3638 /** 3639 * Detaches all views from the parent. Detaching a view should be temporary and followed 3640 * either by a call to {@link #attachViewToParent(View, int, android.view.ViewGroup.LayoutParams)} 3641 * or a call to {@link #removeDetachedView(View, boolean)}. When a view is detached, 3642 * its parent is null and cannot be retrieved by a call to {@link #getChildAt(int)}. 3643 * 3644 * @see #detachViewFromParent(View) 3645 * @see #detachViewFromParent(int) 3646 * @see #detachViewsFromParent(int, int) 3647 * @see #attachViewToParent(View, int, android.view.ViewGroup.LayoutParams) 3648 * @see #removeDetachedView(View, boolean) 3649 */ 3650 protected void detachAllViewsFromParent() { 3651 final int count = mChildrenCount; 3652 if (count <= 0) { 3653 return; 3654 } 3655 3656 final View[] children = mChildren; 3657 mChildrenCount = 0; 3658 3659 for (int i = count - 1; i >= 0; i--) { 3660 children[i].mParent = null; 3661 children[i] = null; 3662 } 3663 } 3664 3665 /** 3666 * Don't call or override this method. It is used for the implementation of 3667 * the view hierarchy. 3668 */ 3669 public final void invalidateChild(View child, final Rect dirty) { 3670 if (ViewDebug.TRACE_HIERARCHY) { 3671 ViewDebug.trace(this, ViewDebug.HierarchyTraceType.INVALIDATE_CHILD); 3672 } 3673 3674 ViewParent parent = this; 3675 3676 final AttachInfo attachInfo = mAttachInfo; 3677 if (attachInfo != null) { 3678 // If the child is drawing an animation, we want to copy this flag onto 3679 // ourselves and the parent to make sure the invalidate request goes 3680 // through 3681 final boolean drawAnimation = (child.mPrivateFlags & DRAW_ANIMATION) == DRAW_ANIMATION; 3682 3683 //noinspection PointlessBooleanExpression 3684 if (!HardwareRenderer.RENDER_DIRTY_REGIONS) { 3685 if (dirty == null) { 3686 if (child.mLayerType != LAYER_TYPE_NONE) { 3687 mPrivateFlags |= INVALIDATED; 3688 mPrivateFlags &= ~DRAWING_CACHE_VALID; 3689 child.mLocalDirtyRect.setEmpty(); 3690 } 3691 do { 3692 View view = null; 3693 if (parent instanceof View) { 3694 view = (View) parent; 3695 if (view.mLayerType != LAYER_TYPE_NONE) { 3696 view.mLocalDirtyRect.setEmpty(); 3697 if (view.getParent() instanceof View) { 3698 final View grandParent = (View) view.getParent(); 3699 grandParent.mPrivateFlags |= INVALIDATED; 3700 grandParent.mPrivateFlags &= ~DRAWING_CACHE_VALID; 3701 } 3702 } 3703 if ((view.mPrivateFlags & DIRTY_MASK) != 0) { 3704 // already marked dirty - we're done 3705 break; 3706 } 3707 } 3708 3709 if (drawAnimation) { 3710 if (view != null) { 3711 view.mPrivateFlags |= DRAW_ANIMATION; 3712 } else if (parent instanceof ViewRootImpl) { 3713 ((ViewRootImpl) parent).mIsAnimating = true; 3714 } 3715 } 3716 3717 if (parent instanceof ViewRootImpl) { 3718 ((ViewRootImpl) parent).invalidate(); 3719 parent = null; 3720 } else if (view != null) { 3721 if ((view.mPrivateFlags & DRAWN) == DRAWN || 3722 (view.mPrivateFlags & DRAWING_CACHE_VALID) == DRAWING_CACHE_VALID) { 3723 view.mPrivateFlags &= ~DRAWING_CACHE_VALID; 3724 view.mPrivateFlags |= DIRTY; 3725 parent = view.mParent; 3726 } else { 3727 parent = null; 3728 } 3729 } 3730 } while (parent != null); 3731 } 3732 3733 return; 3734 } 3735 3736 // Check whether the child that requests the invalidate is fully opaque 3737 // Views being animated or transformed are not considered opaque because we may 3738 // be invalidating their old position and need the parent to paint behind them. 3739 Matrix childMatrix = child.getMatrix(); 3740 final boolean isOpaque = child.isOpaque() && !drawAnimation && 3741 child.getAnimation() == null && childMatrix.isIdentity(); 3742 // Mark the child as dirty, using the appropriate flag 3743 // Make sure we do not set both flags at the same time 3744 int opaqueFlag = isOpaque ? DIRTY_OPAQUE : DIRTY; 3745 3746 if (child.mLayerType != LAYER_TYPE_NONE) { 3747 mPrivateFlags |= INVALIDATED; 3748 mPrivateFlags &= ~DRAWING_CACHE_VALID; 3749 child.mLocalDirtyRect.union(dirty); 3750 } 3751 3752 final int[] location = attachInfo.mInvalidateChildLocation; 3753 location[CHILD_LEFT_INDEX] = child.mLeft; 3754 location[CHILD_TOP_INDEX] = child.mTop; 3755 if (!childMatrix.isIdentity()) { 3756 RectF boundingRect = attachInfo.mTmpTransformRect; 3757 boundingRect.set(dirty); 3758 //boundingRect.inset(-0.5f, -0.5f); 3759 childMatrix.mapRect(boundingRect); 3760 dirty.set((int) (boundingRect.left - 0.5f), 3761 (int) (boundingRect.top - 0.5f), 3762 (int) (boundingRect.right + 0.5f), 3763 (int) (boundingRect.bottom + 0.5f)); 3764 } 3765 3766 do { 3767 View view = null; 3768 if (parent instanceof View) { 3769 view = (View) parent; 3770 if (view.mLayerType != LAYER_TYPE_NONE && 3771 view.getParent() instanceof View) { 3772 final View grandParent = (View) view.getParent(); 3773 grandParent.mPrivateFlags |= INVALIDATED; 3774 grandParent.mPrivateFlags &= ~DRAWING_CACHE_VALID; 3775 } 3776 } 3777 3778 if (drawAnimation) { 3779 if (view != null) { 3780 view.mPrivateFlags |= DRAW_ANIMATION; 3781 } else if (parent instanceof ViewRootImpl) { 3782 ((ViewRootImpl) parent).mIsAnimating = true; 3783 } 3784 } 3785 3786 // If the parent is dirty opaque or not dirty, mark it dirty with the opaque 3787 // flag coming from the child that initiated the invalidate 3788 if (view != null) { 3789 if ((view.mViewFlags & FADING_EDGE_MASK) != 0 && 3790 view.getSolidColor() == 0) { 3791 opaqueFlag = DIRTY; 3792 } 3793 if ((view.mPrivateFlags & DIRTY_MASK) != DIRTY) { 3794 view.mPrivateFlags = (view.mPrivateFlags & ~DIRTY_MASK) | opaqueFlag; 3795 } 3796 } 3797 3798 parent = parent.invalidateChildInParent(location, dirty); 3799 if (view != null) { 3800 // Account for transform on current parent 3801 Matrix m = view.getMatrix(); 3802 if (!m.isIdentity()) { 3803 RectF boundingRect = attachInfo.mTmpTransformRect; 3804 boundingRect.set(dirty); 3805 m.mapRect(boundingRect); 3806 dirty.set((int) (boundingRect.left - 0.5f), 3807 (int) (boundingRect.top - 0.5f), 3808 (int) (boundingRect.right + 0.5f), 3809 (int) (boundingRect.bottom + 0.5f)); 3810 } 3811 } 3812 } while (parent != null); 3813 } 3814 } 3815 3816 /** 3817 * Don't call or override this method. It is used for the implementation of 3818 * the view hierarchy. 3819 * 3820 * This implementation returns null if this ViewGroup does not have a parent, 3821 * if this ViewGroup is already fully invalidated or if the dirty rectangle 3822 * does not intersect with this ViewGroup's bounds. 3823 */ 3824 public ViewParent invalidateChildInParent(final int[] location, final Rect dirty) { 3825 if (ViewDebug.TRACE_HIERARCHY) { 3826 ViewDebug.trace(this, ViewDebug.HierarchyTraceType.INVALIDATE_CHILD_IN_PARENT); 3827 } 3828 3829 if ((mPrivateFlags & DRAWN) == DRAWN || 3830 (mPrivateFlags & DRAWING_CACHE_VALID) == DRAWING_CACHE_VALID) { 3831 if ((mGroupFlags & (FLAG_OPTIMIZE_INVALIDATE | FLAG_ANIMATION_DONE)) != 3832 FLAG_OPTIMIZE_INVALIDATE) { 3833 dirty.offset(location[CHILD_LEFT_INDEX] - mScrollX, 3834 location[CHILD_TOP_INDEX] - mScrollY); 3835 3836 final int left = mLeft; 3837 final int top = mTop; 3838 3839 if ((mGroupFlags & FLAG_CLIP_CHILDREN) != FLAG_CLIP_CHILDREN || 3840 dirty.intersect(0, 0, mRight - left, mBottom - top) || 3841 (mPrivateFlags & DRAW_ANIMATION) == DRAW_ANIMATION) { 3842 mPrivateFlags &= ~DRAWING_CACHE_VALID; 3843 3844 location[CHILD_LEFT_INDEX] = left; 3845 location[CHILD_TOP_INDEX] = top; 3846 3847 if (mLayerType != LAYER_TYPE_NONE) { 3848 mLocalDirtyRect.union(dirty); 3849 } 3850 3851 return mParent; 3852 } 3853 } else { 3854 mPrivateFlags &= ~DRAWN & ~DRAWING_CACHE_VALID; 3855 3856 location[CHILD_LEFT_INDEX] = mLeft; 3857 location[CHILD_TOP_INDEX] = mTop; 3858 if ((mGroupFlags & FLAG_CLIP_CHILDREN) == FLAG_CLIP_CHILDREN) { 3859 dirty.set(0, 0, mRight - mLeft, mBottom - mTop); 3860 } else { 3861 // in case the dirty rect extends outside the bounds of this container 3862 dirty.union(0, 0, mRight - mLeft, mBottom - mTop); 3863 } 3864 3865 if (mLayerType != LAYER_TYPE_NONE) { 3866 mLocalDirtyRect.union(dirty); 3867 } 3868 3869 return mParent; 3870 } 3871 } 3872 3873 return null; 3874 } 3875 3876 /** 3877 * Offset a rectangle that is in a descendant's coordinate 3878 * space into our coordinate space. 3879 * @param descendant A descendant of this view 3880 * @param rect A rectangle defined in descendant's coordinate space. 3881 */ 3882 public final void offsetDescendantRectToMyCoords(View descendant, Rect rect) { 3883 offsetRectBetweenParentAndChild(descendant, rect, true, false); 3884 } 3885 3886 /** 3887 * Offset a rectangle that is in our coordinate space into an ancestor's 3888 * coordinate space. 3889 * @param descendant A descendant of this view 3890 * @param rect A rectangle defined in descendant's coordinate space. 3891 */ 3892 public final void offsetRectIntoDescendantCoords(View descendant, Rect rect) { 3893 offsetRectBetweenParentAndChild(descendant, rect, false, false); 3894 } 3895 3896 /** 3897 * Helper method that offsets a rect either from parent to descendant or 3898 * descendant to parent. 3899 */ 3900 void offsetRectBetweenParentAndChild(View descendant, Rect rect, 3901 boolean offsetFromChildToParent, boolean clipToBounds) { 3902 3903 // already in the same coord system :) 3904 if (descendant == this) { 3905 return; 3906 } 3907 3908 ViewParent theParent = descendant.mParent; 3909 3910 // search and offset up to the parent 3911 while ((theParent != null) 3912 && (theParent instanceof View) 3913 && (theParent != this)) { 3914 3915 if (offsetFromChildToParent) { 3916 rect.offset(descendant.mLeft - descendant.mScrollX, 3917 descendant.mTop - descendant.mScrollY); 3918 if (clipToBounds) { 3919 View p = (View) theParent; 3920 rect.intersect(0, 0, p.mRight - p.mLeft, p.mBottom - p.mTop); 3921 } 3922 } else { 3923 if (clipToBounds) { 3924 View p = (View) theParent; 3925 rect.intersect(0, 0, p.mRight - p.mLeft, p.mBottom - p.mTop); 3926 } 3927 rect.offset(descendant.mScrollX - descendant.mLeft, 3928 descendant.mScrollY - descendant.mTop); 3929 } 3930 3931 descendant = (View) theParent; 3932 theParent = descendant.mParent; 3933 } 3934 3935 // now that we are up to this view, need to offset one more time 3936 // to get into our coordinate space 3937 if (theParent == this) { 3938 if (offsetFromChildToParent) { 3939 rect.offset(descendant.mLeft - descendant.mScrollX, 3940 descendant.mTop - descendant.mScrollY); 3941 } else { 3942 rect.offset(descendant.mScrollX - descendant.mLeft, 3943 descendant.mScrollY - descendant.mTop); 3944 } 3945 } else { 3946 throw new IllegalArgumentException("parameter must be a descendant of this view"); 3947 } 3948 } 3949 3950 /** 3951 * Offset the vertical location of all children of this view by the specified number of pixels. 3952 * 3953 * @param offset the number of pixels to offset 3954 * 3955 * @hide 3956 */ 3957 public void offsetChildrenTopAndBottom(int offset) { 3958 final int count = mChildrenCount; 3959 final View[] children = mChildren; 3960 3961 for (int i = 0; i < count; i++) { 3962 final View v = children[i]; 3963 v.mTop += offset; 3964 v.mBottom += offset; 3965 } 3966 } 3967 3968 /** 3969 * {@inheritDoc} 3970 */ 3971 public boolean getChildVisibleRect(View child, Rect r, android.graphics.Point offset) { 3972 // It doesn't make a whole lot of sense to call this on a view that isn't attached, 3973 // but for some simple tests it can be useful. If we don't have attach info this 3974 // will allocate memory. 3975 final RectF rect = mAttachInfo != null ? mAttachInfo.mTmpTransformRect : new RectF(); 3976 rect.set(r); 3977 3978 if (!child.hasIdentityMatrix()) { 3979 child.getMatrix().mapRect(rect); 3980 } 3981 3982 int dx = child.mLeft - mScrollX; 3983 int dy = child.mTop - mScrollY; 3984 3985 rect.offset(dx, dy); 3986 3987 if (offset != null) { 3988 if (!child.hasIdentityMatrix()) { 3989 float[] position = mAttachInfo != null ? mAttachInfo.mTmpTransformLocation 3990 : new float[2]; 3991 position[0] = offset.x; 3992 position[1] = offset.y; 3993 child.getMatrix().mapPoints(position); 3994 offset.x = (int) (position[0] + 0.5f); 3995 offset.y = (int) (position[1] + 0.5f); 3996 } 3997 offset.x += dx; 3998 offset.y += dy; 3999 } 4000 4001 if (rect.intersect(0, 0, mRight - mLeft, mBottom - mTop)) { 4002 if (mParent == null) return true; 4003 r.set((int) (rect.left + 0.5f), (int) (rect.top + 0.5f), 4004 (int) (rect.right + 0.5f), (int) (rect.bottom + 0.5f)); 4005 return mParent.getChildVisibleRect(this, r, offset); 4006 } 4007 4008 return false; 4009 } 4010 4011 /** 4012 * {@inheritDoc} 4013 */ 4014 @Override 4015 public final void layout(int l, int t, int r, int b) { 4016 if (mTransition == null || !mTransition.isChangingLayout()) { 4017 super.layout(l, t, r, b); 4018 } else { 4019 // record the fact that we noop'd it; request layout when transition finishes 4020 mLayoutSuppressed = true; 4021 } 4022 } 4023 4024 /** 4025 * {@inheritDoc} 4026 */ 4027 @Override 4028 protected abstract void onLayout(boolean changed, 4029 int l, int t, int r, int b); 4030 4031 /** 4032 * Indicates whether the view group has the ability to animate its children 4033 * after the first layout. 4034 * 4035 * @return true if the children can be animated, false otherwise 4036 */ 4037 protected boolean canAnimate() { 4038 return mLayoutAnimationController != null; 4039 } 4040 4041 /** 4042 * Runs the layout animation. Calling this method triggers a relayout of 4043 * this view group. 4044 */ 4045 public void startLayoutAnimation() { 4046 if (mLayoutAnimationController != null) { 4047 mGroupFlags |= FLAG_RUN_ANIMATION; 4048 requestLayout(); 4049 } 4050 } 4051 4052 /** 4053 * Schedules the layout animation to be played after the next layout pass 4054 * of this view group. This can be used to restart the layout animation 4055 * when the content of the view group changes or when the activity is 4056 * paused and resumed. 4057 */ 4058 public void scheduleLayoutAnimation() { 4059 mGroupFlags |= FLAG_RUN_ANIMATION; 4060 } 4061 4062 /** 4063 * Sets the layout animation controller used to animate the group's 4064 * children after the first layout. 4065 * 4066 * @param controller the animation controller 4067 */ 4068 public void setLayoutAnimation(LayoutAnimationController controller) { 4069 mLayoutAnimationController = controller; 4070 if (mLayoutAnimationController != null) { 4071 mGroupFlags |= FLAG_RUN_ANIMATION; 4072 } 4073 } 4074 4075 /** 4076 * Returns the layout animation controller used to animate the group's 4077 * children. 4078 * 4079 * @return the current animation controller 4080 */ 4081 public LayoutAnimationController getLayoutAnimation() { 4082 return mLayoutAnimationController; 4083 } 4084 4085 /** 4086 * Indicates whether the children's drawing cache is used during a layout 4087 * animation. By default, the drawing cache is enabled but this will prevent 4088 * nested layout animations from working. To nest animations, you must disable 4089 * the cache. 4090 * 4091 * @return true if the animation cache is enabled, false otherwise 4092 * 4093 * @see #setAnimationCacheEnabled(boolean) 4094 * @see View#setDrawingCacheEnabled(boolean) 4095 */ 4096 @ViewDebug.ExportedProperty 4097 public boolean isAnimationCacheEnabled() { 4098 return (mGroupFlags & FLAG_ANIMATION_CACHE) == FLAG_ANIMATION_CACHE; 4099 } 4100 4101 /** 4102 * Enables or disables the children's drawing cache during a layout animation. 4103 * By default, the drawing cache is enabled but this will prevent nested 4104 * layout animations from working. To nest animations, you must disable the 4105 * cache. 4106 * 4107 * @param enabled true to enable the animation cache, false otherwise 4108 * 4109 * @see #isAnimationCacheEnabled() 4110 * @see View#setDrawingCacheEnabled(boolean) 4111 */ 4112 public void setAnimationCacheEnabled(boolean enabled) { 4113 setBooleanFlag(FLAG_ANIMATION_CACHE, enabled); 4114 } 4115 4116 /** 4117 * Indicates whether this ViewGroup will always try to draw its children using their 4118 * drawing cache. By default this property is enabled. 4119 * 4120 * @return true if the animation cache is enabled, false otherwise 4121 * 4122 * @see #setAlwaysDrawnWithCacheEnabled(boolean) 4123 * @see #setChildrenDrawnWithCacheEnabled(boolean) 4124 * @see View#setDrawingCacheEnabled(boolean) 4125 */ 4126 @ViewDebug.ExportedProperty(category = "drawing") 4127 public boolean isAlwaysDrawnWithCacheEnabled() { 4128 return (mGroupFlags & FLAG_ALWAYS_DRAWN_WITH_CACHE) == FLAG_ALWAYS_DRAWN_WITH_CACHE; 4129 } 4130 4131 /** 4132 * Indicates whether this ViewGroup will always try to draw its children using their 4133 * drawing cache. This property can be set to true when the cache rendering is 4134 * slightly different from the children's normal rendering. Renderings can be different, 4135 * for instance, when the cache's quality is set to low. 4136 * 4137 * When this property is disabled, the ViewGroup will use the drawing cache of its 4138 * children only when asked to. It's usually the task of subclasses to tell ViewGroup 4139 * when to start using the drawing cache and when to stop using it. 4140 * 4141 * @param always true to always draw with the drawing cache, false otherwise 4142 * 4143 * @see #isAlwaysDrawnWithCacheEnabled() 4144 * @see #setChildrenDrawnWithCacheEnabled(boolean) 4145 * @see View#setDrawingCacheEnabled(boolean) 4146 * @see View#setDrawingCacheQuality(int) 4147 */ 4148 public void setAlwaysDrawnWithCacheEnabled(boolean always) { 4149 setBooleanFlag(FLAG_ALWAYS_DRAWN_WITH_CACHE, always); 4150 } 4151 4152 /** 4153 * Indicates whether the ViewGroup is currently drawing its children using 4154 * their drawing cache. 4155 * 4156 * @return true if children should be drawn with their cache, false otherwise 4157 * 4158 * @see #setAlwaysDrawnWithCacheEnabled(boolean) 4159 * @see #setChildrenDrawnWithCacheEnabled(boolean) 4160 */ 4161 @ViewDebug.ExportedProperty(category = "drawing") 4162 protected boolean isChildrenDrawnWithCacheEnabled() { 4163 return (mGroupFlags & FLAG_CHILDREN_DRAWN_WITH_CACHE) == FLAG_CHILDREN_DRAWN_WITH_CACHE; 4164 } 4165 4166 /** 4167 * Tells the ViewGroup to draw its children using their drawing cache. This property 4168 * is ignored when {@link #isAlwaysDrawnWithCacheEnabled()} is true. A child's drawing cache 4169 * will be used only if it has been enabled. 4170 * 4171 * Subclasses should call this method to start and stop using the drawing cache when 4172 * they perform performance sensitive operations, like scrolling or animating. 4173 * 4174 * @param enabled true if children should be drawn with their cache, false otherwise 4175 * 4176 * @see #setAlwaysDrawnWithCacheEnabled(boolean) 4177 * @see #isChildrenDrawnWithCacheEnabled() 4178 */ 4179 protected void setChildrenDrawnWithCacheEnabled(boolean enabled) { 4180 setBooleanFlag(FLAG_CHILDREN_DRAWN_WITH_CACHE, enabled); 4181 } 4182 4183 /** 4184 * Indicates whether the ViewGroup is drawing its children in the order defined by 4185 * {@link #getChildDrawingOrder(int, int)}. 4186 * 4187 * @return true if children drawing order is defined by {@link #getChildDrawingOrder(int, int)}, 4188 * false otherwise 4189 * 4190 * @see #setChildrenDrawingOrderEnabled(boolean) 4191 * @see #getChildDrawingOrder(int, int) 4192 */ 4193 @ViewDebug.ExportedProperty(category = "drawing") 4194 protected boolean isChildrenDrawingOrderEnabled() { 4195 return (mGroupFlags & FLAG_USE_CHILD_DRAWING_ORDER) == FLAG_USE_CHILD_DRAWING_ORDER; 4196 } 4197 4198 /** 4199 * Tells the ViewGroup whether to draw its children in the order defined by the method 4200 * {@link #getChildDrawingOrder(int, int)}. 4201 * 4202 * @param enabled true if the order of the children when drawing is determined by 4203 * {@link #getChildDrawingOrder(int, int)}, false otherwise 4204 * 4205 * @see #isChildrenDrawingOrderEnabled() 4206 * @see #getChildDrawingOrder(int, int) 4207 */ 4208 protected void setChildrenDrawingOrderEnabled(boolean enabled) { 4209 setBooleanFlag(FLAG_USE_CHILD_DRAWING_ORDER, enabled); 4210 } 4211 4212 private void setBooleanFlag(int flag, boolean value) { 4213 if (value) { 4214 mGroupFlags |= flag; 4215 } else { 4216 mGroupFlags &= ~flag; 4217 } 4218 } 4219 4220 /** 4221 * Returns an integer indicating what types of drawing caches are kept in memory. 4222 * 4223 * @see #setPersistentDrawingCache(int) 4224 * @see #setAnimationCacheEnabled(boolean) 4225 * 4226 * @return one or a combination of {@link #PERSISTENT_NO_CACHE}, 4227 * {@link #PERSISTENT_ANIMATION_CACHE}, {@link #PERSISTENT_SCROLLING_CACHE} 4228 * and {@link #PERSISTENT_ALL_CACHES} 4229 */ 4230 @ViewDebug.ExportedProperty(category = "drawing", mapping = { 4231 @ViewDebug.IntToString(from = PERSISTENT_NO_CACHE, to = "NONE"), 4232 @ViewDebug.IntToString(from = PERSISTENT_ANIMATION_CACHE, to = "ANIMATION"), 4233 @ViewDebug.IntToString(from = PERSISTENT_SCROLLING_CACHE, to = "SCROLLING"), 4234 @ViewDebug.IntToString(from = PERSISTENT_ALL_CACHES, to = "ALL") 4235 }) 4236 public int getPersistentDrawingCache() { 4237 return mPersistentDrawingCache; 4238 } 4239 4240 /** 4241 * Indicates what types of drawing caches should be kept in memory after 4242 * they have been created. 4243 * 4244 * @see #getPersistentDrawingCache() 4245 * @see #setAnimationCacheEnabled(boolean) 4246 * 4247 * @param drawingCacheToKeep one or a combination of {@link #PERSISTENT_NO_CACHE}, 4248 * {@link #PERSISTENT_ANIMATION_CACHE}, {@link #PERSISTENT_SCROLLING_CACHE} 4249 * and {@link #PERSISTENT_ALL_CACHES} 4250 */ 4251 public void setPersistentDrawingCache(int drawingCacheToKeep) { 4252 mPersistentDrawingCache = drawingCacheToKeep & PERSISTENT_ALL_CACHES; 4253 } 4254 4255 /** 4256 * Returns a new set of layout parameters based on the supplied attributes set. 4257 * 4258 * @param attrs the attributes to build the layout parameters from 4259 * 4260 * @return an instance of {@link android.view.ViewGroup.LayoutParams} or one 4261 * of its descendants 4262 */ 4263 public LayoutParams generateLayoutParams(AttributeSet attrs) { 4264 return new LayoutParams(getContext(), attrs); 4265 } 4266 4267 /** 4268 * Returns a safe set of layout parameters based on the supplied layout params. 4269 * When a ViewGroup is passed a View whose layout params do not pass the test of 4270 * {@link #checkLayoutParams(android.view.ViewGroup.LayoutParams)}, this method 4271 * is invoked. This method should return a new set of layout params suitable for 4272 * this ViewGroup, possibly by copying the appropriate attributes from the 4273 * specified set of layout params. 4274 * 4275 * @param p The layout parameters to convert into a suitable set of layout parameters 4276 * for this ViewGroup. 4277 * 4278 * @return an instance of {@link android.view.ViewGroup.LayoutParams} or one 4279 * of its descendants 4280 */ 4281 protected LayoutParams generateLayoutParams(ViewGroup.LayoutParams p) { 4282 return p; 4283 } 4284 4285 /** 4286 * Returns a set of default layout parameters. These parameters are requested 4287 * when the View passed to {@link #addView(View)} has no layout parameters 4288 * already set. If null is returned, an exception is thrown from addView. 4289 * 4290 * @return a set of default layout parameters or null 4291 */ 4292 protected LayoutParams generateDefaultLayoutParams() { 4293 return new LayoutParams(LayoutParams.WRAP_CONTENT, LayoutParams.WRAP_CONTENT); 4294 } 4295 4296 /** 4297 * @hide 4298 */ 4299 @Override 4300 protected boolean dispatchConsistencyCheck(int consistency) { 4301 boolean result = super.dispatchConsistencyCheck(consistency); 4302 4303 final int count = mChildrenCount; 4304 final View[] children = mChildren; 4305 for (int i = 0; i < count; i++) { 4306 if (!children[i].dispatchConsistencyCheck(consistency)) result = false; 4307 } 4308 4309 return result; 4310 } 4311 4312 /** 4313 * @hide 4314 */ 4315 @Override 4316 protected boolean onConsistencyCheck(int consistency) { 4317 boolean result = super.onConsistencyCheck(consistency); 4318 4319 final boolean checkLayout = (consistency & ViewDebug.CONSISTENCY_LAYOUT) != 0; 4320 final boolean checkDrawing = (consistency & ViewDebug.CONSISTENCY_DRAWING) != 0; 4321 4322 if (checkLayout) { 4323 final int count = mChildrenCount; 4324 final View[] children = mChildren; 4325 for (int i = 0; i < count; i++) { 4326 if (children[i].getParent() != this) { 4327 result = false; 4328 android.util.Log.d(ViewDebug.CONSISTENCY_LOG_TAG, 4329 "View " + children[i] + " has no parent/a parent that is not " + this); 4330 } 4331 } 4332 } 4333 4334 if (checkDrawing) { 4335 // If this group is dirty, check that the parent is dirty as well 4336 if ((mPrivateFlags & DIRTY_MASK) != 0) { 4337 final ViewParent parent = getParent(); 4338 if (parent != null && !(parent instanceof ViewRootImpl)) { 4339 if ((((View) parent).mPrivateFlags & DIRTY_MASK) == 0) { 4340 result = false; 4341 android.util.Log.d(ViewDebug.CONSISTENCY_LOG_TAG, 4342 "ViewGroup " + this + " is dirty but its parent is not: " + this); 4343 } 4344 } 4345 } 4346 } 4347 4348 return result; 4349 } 4350 4351 /** 4352 * {@inheritDoc} 4353 */ 4354 @Override 4355 protected void debug(int depth) { 4356 super.debug(depth); 4357 String output; 4358 4359 if (mFocused != null) { 4360 output = debugIndent(depth); 4361 output += "mFocused"; 4362 Log.d(VIEW_LOG_TAG, output); 4363 } 4364 if (mChildrenCount != 0) { 4365 output = debugIndent(depth); 4366 output += "{"; 4367 Log.d(VIEW_LOG_TAG, output); 4368 } 4369 int count = mChildrenCount; 4370 for (int i = 0; i < count; i++) { 4371 View child = mChildren[i]; 4372 child.debug(depth + 1); 4373 } 4374 4375 if (mChildrenCount != 0) { 4376 output = debugIndent(depth); 4377 output += "}"; 4378 Log.d(VIEW_LOG_TAG, output); 4379 } 4380 } 4381 4382 /** 4383 * Returns the position in the group of the specified child view. 4384 * 4385 * @param child the view for which to get the position 4386 * @return a positive integer representing the position of the view in the 4387 * group, or -1 if the view does not exist in the group 4388 */ 4389 public int indexOfChild(View child) { 4390 final int count = mChildrenCount; 4391 final View[] children = mChildren; 4392 for (int i = 0; i < count; i++) { 4393 if (children[i] == child) { 4394 return i; 4395 } 4396 } 4397 return -1; 4398 } 4399 4400 /** 4401 * Returns the number of children in the group. 4402 * 4403 * @return a positive integer representing the number of children in 4404 * the group 4405 */ 4406 public int getChildCount() { 4407 return mChildrenCount; 4408 } 4409 4410 /** 4411 * Returns the view at the specified position in the group. 4412 * 4413 * @param index the position at which to get the view from 4414 * @return the view at the specified position or null if the position 4415 * does not exist within the group 4416 */ 4417 public View getChildAt(int index) { 4418 if (index < 0 || index >= mChildrenCount) { 4419 return null; 4420 } 4421 return mChildren[index]; 4422 } 4423 4424 /** 4425 * Ask all of the children of this view to measure themselves, taking into 4426 * account both the MeasureSpec requirements for this view and its padding. 4427 * We skip children that are in the GONE state The heavy lifting is done in 4428 * getChildMeasureSpec. 4429 * 4430 * @param widthMeasureSpec The width requirements for this view 4431 * @param heightMeasureSpec The height requirements for this view 4432 */ 4433 protected void measureChildren(int widthMeasureSpec, int heightMeasureSpec) { 4434 final int size = mChildrenCount; 4435 final View[] children = mChildren; 4436 for (int i = 0; i < size; ++i) { 4437 final View child = children[i]; 4438 if ((child.mViewFlags & VISIBILITY_MASK) != GONE) { 4439 measureChild(child, widthMeasureSpec, heightMeasureSpec); 4440 } 4441 } 4442 } 4443 4444 /** 4445 * Ask one of the children of this view to measure itself, taking into 4446 * account both the MeasureSpec requirements for this view and its padding. 4447 * The heavy lifting is done in getChildMeasureSpec. 4448 * 4449 * @param child The child to measure 4450 * @param parentWidthMeasureSpec The width requirements for this view 4451 * @param parentHeightMeasureSpec The height requirements for this view 4452 */ 4453 protected void measureChild(View child, int parentWidthMeasureSpec, 4454 int parentHeightMeasureSpec) { 4455 final LayoutParams lp = child.getLayoutParams(); 4456 4457 final int childWidthMeasureSpec = getChildMeasureSpec(parentWidthMeasureSpec, 4458 mPaddingLeft + mPaddingRight, lp.width); 4459 final int childHeightMeasureSpec = getChildMeasureSpec(parentHeightMeasureSpec, 4460 mPaddingTop + mPaddingBottom, lp.height); 4461 4462 child.measure(childWidthMeasureSpec, childHeightMeasureSpec); 4463 } 4464 4465 /** 4466 * Ask one of the children of this view to measure itself, taking into 4467 * account both the MeasureSpec requirements for this view and its padding 4468 * and margins. The child must have MarginLayoutParams The heavy lifting is 4469 * done in getChildMeasureSpec. 4470 * 4471 * @param child The child to measure 4472 * @param parentWidthMeasureSpec The width requirements for this view 4473 * @param widthUsed Extra space that has been used up by the parent 4474 * horizontally (possibly by other children of the parent) 4475 * @param parentHeightMeasureSpec The height requirements for this view 4476 * @param heightUsed Extra space that has been used up by the parent 4477 * vertically (possibly by other children of the parent) 4478 */ 4479 protected void measureChildWithMargins(View child, 4480 int parentWidthMeasureSpec, int widthUsed, 4481 int parentHeightMeasureSpec, int heightUsed) { 4482 final MarginLayoutParams lp = (MarginLayoutParams) child.getLayoutParams(); 4483 4484 final int childWidthMeasureSpec = getChildMeasureSpec(parentWidthMeasureSpec, 4485 mPaddingLeft + mPaddingRight + lp.leftMargin + lp.rightMargin 4486 + widthUsed, lp.width); 4487 final int childHeightMeasureSpec = getChildMeasureSpec(parentHeightMeasureSpec, 4488 mPaddingTop + mPaddingBottom + lp.topMargin + lp.bottomMargin 4489 + heightUsed, lp.height); 4490 4491 child.measure(childWidthMeasureSpec, childHeightMeasureSpec); 4492 } 4493 4494 /** 4495 * Does the hard part of measureChildren: figuring out the MeasureSpec to 4496 * pass to a particular child. This method figures out the right MeasureSpec 4497 * for one dimension (height or width) of one child view. 4498 * 4499 * The goal is to combine information from our MeasureSpec with the 4500 * LayoutParams of the child to get the best possible results. For example, 4501 * if the this view knows its size (because its MeasureSpec has a mode of 4502 * EXACTLY), and the child has indicated in its LayoutParams that it wants 4503 * to be the same size as the parent, the parent should ask the child to 4504 * layout given an exact size. 4505 * 4506 * @param spec The requirements for this view 4507 * @param padding The padding of this view for the current dimension and 4508 * margins, if applicable 4509 * @param childDimension How big the child wants to be in the current 4510 * dimension 4511 * @return a MeasureSpec integer for the child 4512 */ 4513 public static int getChildMeasureSpec(int spec, int padding, int childDimension) { 4514 int specMode = MeasureSpec.getMode(spec); 4515 int specSize = MeasureSpec.getSize(spec); 4516 4517 int size = Math.max(0, specSize - padding); 4518 4519 int resultSize = 0; 4520 int resultMode = 0; 4521 4522 switch (specMode) { 4523 // Parent has imposed an exact size on us 4524 case MeasureSpec.EXACTLY: 4525 if (childDimension >= 0) { 4526 resultSize = childDimension; 4527 resultMode = MeasureSpec.EXACTLY; 4528 } else if (childDimension == LayoutParams.MATCH_PARENT) { 4529 // Child wants to be our size. So be it. 4530 resultSize = size; 4531 resultMode = MeasureSpec.EXACTLY; 4532 } else if (childDimension == LayoutParams.WRAP_CONTENT) { 4533 // Child wants to determine its own size. It can't be 4534 // bigger than us. 4535 resultSize = size; 4536 resultMode = MeasureSpec.AT_MOST; 4537 } 4538 break; 4539 4540 // Parent has imposed a maximum size on us 4541 case MeasureSpec.AT_MOST: 4542 if (childDimension >= 0) { 4543 // Child wants a specific size... so be it 4544 resultSize = childDimension; 4545 resultMode = MeasureSpec.EXACTLY; 4546 } else if (childDimension == LayoutParams.MATCH_PARENT) { 4547 // Child wants to be our size, but our size is not fixed. 4548 // Constrain child to not be bigger than us. 4549 resultSize = size; 4550 resultMode = MeasureSpec.AT_MOST; 4551 } else if (childDimension == LayoutParams.WRAP_CONTENT) { 4552 // Child wants to determine its own size. It can't be 4553 // bigger than us. 4554 resultSize = size; 4555 resultMode = MeasureSpec.AT_MOST; 4556 } 4557 break; 4558 4559 // Parent asked to see how big we want to be 4560 case MeasureSpec.UNSPECIFIED: 4561 if (childDimension >= 0) { 4562 // Child wants a specific size... let him have it 4563 resultSize = childDimension; 4564 resultMode = MeasureSpec.EXACTLY; 4565 } else if (childDimension == LayoutParams.MATCH_PARENT) { 4566 // Child wants to be our size... find out how big it should 4567 // be 4568 resultSize = 0; 4569 resultMode = MeasureSpec.UNSPECIFIED; 4570 } else if (childDimension == LayoutParams.WRAP_CONTENT) { 4571 // Child wants to determine its own size.... find out how 4572 // big it should be 4573 resultSize = 0; 4574 resultMode = MeasureSpec.UNSPECIFIED; 4575 } 4576 break; 4577 } 4578 return MeasureSpec.makeMeasureSpec(resultSize, resultMode); 4579 } 4580 4581 4582 /** 4583 * Removes any pending animations for views that have been removed. Call 4584 * this if you don't want animations for exiting views to stack up. 4585 */ 4586 public void clearDisappearingChildren() { 4587 if (mDisappearingChildren != null) { 4588 mDisappearingChildren.clear(); 4589 } 4590 } 4591 4592 /** 4593 * Add a view which is removed from mChildren but still needs animation 4594 * 4595 * @param v View to add 4596 */ 4597 private void addDisappearingView(View v) { 4598 ArrayList<View> disappearingChildren = mDisappearingChildren; 4599 4600 if (disappearingChildren == null) { 4601 disappearingChildren = mDisappearingChildren = new ArrayList<View>(); 4602 } 4603 4604 disappearingChildren.add(v); 4605 } 4606 4607 /** 4608 * Cleanup a view when its animation is done. This may mean removing it from 4609 * the list of disappearing views. 4610 * 4611 * @param view The view whose animation has finished 4612 * @param animation The animation, cannot be null 4613 */ 4614 void finishAnimatingView(final View view, Animation animation) { 4615 final ArrayList<View> disappearingChildren = mDisappearingChildren; 4616 if (disappearingChildren != null) { 4617 if (disappearingChildren.contains(view)) { 4618 disappearingChildren.remove(view); 4619 4620 if (view.mAttachInfo != null) { 4621 view.dispatchDetachedFromWindow(); 4622 } 4623 4624 view.clearAnimation(); 4625 mGroupFlags |= FLAG_INVALIDATE_REQUIRED; 4626 } 4627 } 4628 4629 if (animation != null && !animation.getFillAfter()) { 4630 view.clearAnimation(); 4631 } 4632 4633 if ((view.mPrivateFlags & ANIMATION_STARTED) == ANIMATION_STARTED) { 4634 view.onAnimationEnd(); 4635 // Should be performed by onAnimationEnd() but this avoid an infinite loop, 4636 // so we'd rather be safe than sorry 4637 view.mPrivateFlags &= ~ANIMATION_STARTED; 4638 // Draw one more frame after the animation is done 4639 mGroupFlags |= FLAG_INVALIDATE_REQUIRED; 4640 } 4641 } 4642 4643 /** 4644 * Utility function called by View during invalidation to determine whether a view that 4645 * is invisible or gone should still be invalidated because it is being transitioned (and 4646 * therefore still needs to be drawn). 4647 */ 4648 boolean isViewTransitioning(View view) { 4649 return (mTransitioningViews != null && mTransitioningViews.contains(view)); 4650 } 4651 4652 /** 4653 * This method tells the ViewGroup that the given View object, which should have this 4654 * ViewGroup as its parent, 4655 * should be kept around (re-displayed when the ViewGroup draws its children) even if it 4656 * is removed from its parent. This allows animations, such as those used by 4657 * {@link android.app.Fragment} and {@link android.animation.LayoutTransition} to animate 4658 * the removal of views. A call to this method should always be accompanied by a later call 4659 * to {@link #endViewTransition(View)}, such as after an animation on the View has finished, 4660 * so that the View finally gets removed. 4661 * 4662 * @param view The View object to be kept visible even if it gets removed from its parent. 4663 */ 4664 public void startViewTransition(View view) { 4665 if (view.mParent == this) { 4666 if (mTransitioningViews == null) { 4667 mTransitioningViews = new ArrayList<View>(); 4668 } 4669 mTransitioningViews.add(view); 4670 } 4671 } 4672 4673 /** 4674 * This method should always be called following an earlier call to 4675 * {@link #startViewTransition(View)}. The given View is finally removed from its parent 4676 * and will no longer be displayed. Note that this method does not perform the functionality 4677 * of removing a view from its parent; it just discontinues the display of a View that 4678 * has previously been removed. 4679 * 4680 * @return view The View object that has been removed but is being kept around in the visible 4681 * hierarchy by an earlier call to {@link #startViewTransition(View)}. 4682 */ 4683 public void endViewTransition(View view) { 4684 if (mTransitioningViews != null) { 4685 mTransitioningViews.remove(view); 4686 final ArrayList<View> disappearingChildren = mDisappearingChildren; 4687 if (disappearingChildren != null && disappearingChildren.contains(view)) { 4688 disappearingChildren.remove(view); 4689 if (mVisibilityChangingChildren != null && 4690 mVisibilityChangingChildren.contains(view)) { 4691 mVisibilityChangingChildren.remove(view); 4692 } else { 4693 if (view.mAttachInfo != null) { 4694 view.dispatchDetachedFromWindow(); 4695 } 4696 if (view.mParent != null) { 4697 view.mParent = null; 4698 } 4699 } 4700 mGroupFlags |= FLAG_INVALIDATE_REQUIRED; 4701 } 4702 } 4703 } 4704 4705 private LayoutTransition.TransitionListener mLayoutTransitionListener = 4706 new LayoutTransition.TransitionListener() { 4707 @Override 4708 public void startTransition(LayoutTransition transition, ViewGroup container, 4709 View view, int transitionType) { 4710 // We only care about disappearing items, since we need special logic to keep 4711 // those items visible after they've been 'removed' 4712 if (transitionType == LayoutTransition.DISAPPEARING) { 4713 startViewTransition(view); 4714 } 4715 } 4716 4717 @Override 4718 public void endTransition(LayoutTransition transition, ViewGroup container, 4719 View view, int transitionType) { 4720 if (mLayoutSuppressed && !transition.isChangingLayout()) { 4721 requestLayout(); 4722 mLayoutSuppressed = false; 4723 } 4724 if (transitionType == LayoutTransition.DISAPPEARING && mTransitioningViews != null) { 4725 endViewTransition(view); 4726 } 4727 } 4728 }; 4729 4730 /** 4731 * {@inheritDoc} 4732 */ 4733 @Override 4734 public boolean gatherTransparentRegion(Region region) { 4735 // If no transparent regions requested, we are always opaque. 4736 final boolean meOpaque = (mPrivateFlags & View.REQUEST_TRANSPARENT_REGIONS) == 0; 4737 if (meOpaque && region == null) { 4738 // The caller doesn't care about the region, so stop now. 4739 return true; 4740 } 4741 super.gatherTransparentRegion(region); 4742 final View[] children = mChildren; 4743 final int count = mChildrenCount; 4744 boolean noneOfTheChildrenAreTransparent = true; 4745 for (int i = 0; i < count; i++) { 4746 final View child = children[i]; 4747 if ((child.mViewFlags & VISIBILITY_MASK) == VISIBLE || child.getAnimation() != null) { 4748 if (!child.gatherTransparentRegion(region)) { 4749 noneOfTheChildrenAreTransparent = false; 4750 } 4751 } 4752 } 4753 return meOpaque || noneOfTheChildrenAreTransparent; 4754 } 4755 4756 /** 4757 * {@inheritDoc} 4758 */ 4759 public void requestTransparentRegion(View child) { 4760 if (child != null) { 4761 child.mPrivateFlags |= View.REQUEST_TRANSPARENT_REGIONS; 4762 if (mParent != null) { 4763 mParent.requestTransparentRegion(this); 4764 } 4765 } 4766 } 4767 4768 4769 @Override 4770 protected boolean fitSystemWindows(Rect insets) { 4771 boolean done = super.fitSystemWindows(insets); 4772 if (!done) { 4773 final int count = mChildrenCount; 4774 final View[] children = mChildren; 4775 for (int i = 0; i < count; i++) { 4776 done = children[i].fitSystemWindows(insets); 4777 if (done) { 4778 break; 4779 } 4780 } 4781 } 4782 return done; 4783 } 4784 4785 /** 4786 * Returns the animation listener to which layout animation events are 4787 * sent. 4788 * 4789 * @return an {@link android.view.animation.Animation.AnimationListener} 4790 */ 4791 public Animation.AnimationListener getLayoutAnimationListener() { 4792 return mAnimationListener; 4793 } 4794 4795 @Override 4796 protected void drawableStateChanged() { 4797 super.drawableStateChanged(); 4798 4799 if ((mGroupFlags & FLAG_NOTIFY_CHILDREN_ON_DRAWABLE_STATE_CHANGE) != 0) { 4800 if ((mGroupFlags & FLAG_ADD_STATES_FROM_CHILDREN) != 0) { 4801 throw new IllegalStateException("addStateFromChildren cannot be enabled if a" 4802 + " child has duplicateParentState set to true"); 4803 } 4804 4805 final View[] children = mChildren; 4806 final int count = mChildrenCount; 4807 4808 for (int i = 0; i < count; i++) { 4809 final View child = children[i]; 4810 if ((child.mViewFlags & DUPLICATE_PARENT_STATE) != 0) { 4811 child.refreshDrawableState(); 4812 } 4813 } 4814 } 4815 } 4816 4817 @Override 4818 public void jumpDrawablesToCurrentState() { 4819 super.jumpDrawablesToCurrentState(); 4820 final View[] children = mChildren; 4821 final int count = mChildrenCount; 4822 for (int i = 0; i < count; i++) { 4823 children[i].jumpDrawablesToCurrentState(); 4824 } 4825 } 4826 4827 @Override 4828 protected int[] onCreateDrawableState(int extraSpace) { 4829 if ((mGroupFlags & FLAG_ADD_STATES_FROM_CHILDREN) == 0) { 4830 return super.onCreateDrawableState(extraSpace); 4831 } 4832 4833 int need = 0; 4834 int n = getChildCount(); 4835 for (int i = 0; i < n; i++) { 4836 int[] childState = getChildAt(i).getDrawableState(); 4837 4838 if (childState != null) { 4839 need += childState.length; 4840 } 4841 } 4842 4843 int[] state = super.onCreateDrawableState(extraSpace + need); 4844 4845 for (int i = 0; i < n; i++) { 4846 int[] childState = getChildAt(i).getDrawableState(); 4847 4848 if (childState != null) { 4849 state = mergeDrawableStates(state, childState); 4850 } 4851 } 4852 4853 return state; 4854 } 4855 4856 /** 4857 * Sets whether this ViewGroup's drawable states also include 4858 * its children's drawable states. This is used, for example, to 4859 * make a group appear to be focused when its child EditText or button 4860 * is focused. 4861 */ 4862 public void setAddStatesFromChildren(boolean addsStates) { 4863 if (addsStates) { 4864 mGroupFlags |= FLAG_ADD_STATES_FROM_CHILDREN; 4865 } else { 4866 mGroupFlags &= ~FLAG_ADD_STATES_FROM_CHILDREN; 4867 } 4868 4869 refreshDrawableState(); 4870 } 4871 4872 /** 4873 * Returns whether this ViewGroup's drawable states also include 4874 * its children's drawable states. This is used, for example, to 4875 * make a group appear to be focused when its child EditText or button 4876 * is focused. 4877 */ 4878 public boolean addStatesFromChildren() { 4879 return (mGroupFlags & FLAG_ADD_STATES_FROM_CHILDREN) != 0; 4880 } 4881 4882 /** 4883 * If {link #addStatesFromChildren} is true, refreshes this group's 4884 * drawable state (to include the states from its children). 4885 */ 4886 public void childDrawableStateChanged(View child) { 4887 if ((mGroupFlags & FLAG_ADD_STATES_FROM_CHILDREN) != 0) { 4888 refreshDrawableState(); 4889 } 4890 } 4891 4892 /** 4893 * Specifies the animation listener to which layout animation events must 4894 * be sent. Only 4895 * {@link android.view.animation.Animation.AnimationListener#onAnimationStart(Animation)} 4896 * and 4897 * {@link android.view.animation.Animation.AnimationListener#onAnimationEnd(Animation)} 4898 * are invoked. 4899 * 4900 * @param animationListener the layout animation listener 4901 */ 4902 public void setLayoutAnimationListener(Animation.AnimationListener animationListener) { 4903 mAnimationListener = animationListener; 4904 } 4905 4906 /** 4907 * This method is called by LayoutTransition when there are 'changing' animations that need 4908 * to start after the layout/setup phase. The request is forwarded to the ViewAncestor, who 4909 * starts all pending transitions prior to the drawing phase in the current traversal. 4910 * 4911 * @param transition The LayoutTransition to be started on the next traversal. 4912 * 4913 * @hide 4914 */ 4915 public void requestTransitionStart(LayoutTransition transition) { 4916 ViewRootImpl viewAncestor = getViewRootImpl(); 4917 if (viewAncestor != null) { 4918 viewAncestor.requestTransitionStart(transition); 4919 } 4920 } 4921 4922 @Override 4923 protected void resetResolvedLayoutDirection() { 4924 super.resetResolvedLayoutDirection(); 4925 4926 // Take care of resetting the children resolution too 4927 final int count = getChildCount(); 4928 for (int i = 0; i < count; i++) { 4929 final View child = getChildAt(i); 4930 if (child.getLayoutDirection() == LAYOUT_DIRECTION_INHERIT) { 4931 child.resetResolvedLayoutDirection(); 4932 } 4933 } 4934 } 4935 4936 @Override 4937 public void onResetResolvedTextDirection() { 4938 // Take care of resetting the children resolution too 4939 final int count = getChildCount(); 4940 for (int i = 0; i < count; i++) { 4941 final View child = getChildAt(i); 4942 if (child.getTextDirection() == TEXT_DIRECTION_INHERIT) { 4943 child.resetResolvedTextDirection(); 4944 } 4945 } 4946 } 4947 4948 /** 4949 * Return true if the pressed state should be delayed for children or descendants of this 4950 * ViewGroup. Generally, this should be done for containers that can scroll, such as a List. 4951 * This prevents the pressed state from appearing when the user is actually trying to scroll 4952 * the content. 4953 * 4954 * The default implementation returns true for compatibility reasons. Subclasses that do 4955 * not scroll should generally override this method and return false. 4956 */ 4957 public boolean shouldDelayChildPressedState() { 4958 return true; 4959 } 4960 4961 /** @hide */ 4962 protected void onSetLayoutParams(View child, LayoutParams layoutParams) { 4963 } 4964 4965 /** 4966 * LayoutParams are used by views to tell their parents how they want to be 4967 * laid out. See 4968 * {@link android.R.styleable#ViewGroup_Layout ViewGroup Layout Attributes} 4969 * for a list of all child view attributes that this class supports. 4970 * 4971 * <p> 4972 * The base LayoutParams class just describes how big the view wants to be 4973 * for both width and height. For each dimension, it can specify one of: 4974 * <ul> 4975 * <li>FILL_PARENT (renamed MATCH_PARENT in API Level 8 and higher), which 4976 * means that the view wants to be as big as its parent (minus padding) 4977 * <li> WRAP_CONTENT, which means that the view wants to be just big enough 4978 * to enclose its content (plus padding) 4979 * <li> an exact number 4980 * </ul> 4981 * There are subclasses of LayoutParams for different subclasses of 4982 * ViewGroup. For example, AbsoluteLayout has its own subclass of 4983 * LayoutParams which adds an X and Y value.</p> 4984 * 4985 * <div class="special reference"> 4986 * <h3>Developer Guides</h3> 4987 * <p>For more information about creating user interface layouts, read the 4988 * <a href="{@docRoot}guide/topics/ui/declaring-layout.html">XML Layouts</a> developer 4989 * guide.</p></div> 4990 * 4991 * @attr ref android.R.styleable#ViewGroup_Layout_layout_height 4992 * @attr ref android.R.styleable#ViewGroup_Layout_layout_width 4993 */ 4994 public static class LayoutParams { 4995 /** 4996 * Special value for the height or width requested by a View. 4997 * FILL_PARENT means that the view wants to be as big as its parent, 4998 * minus the parent's padding, if any. This value is deprecated 4999 * starting in API Level 8 and replaced by {@link #MATCH_PARENT}. 5000 */ 5001 @SuppressWarnings({"UnusedDeclaration"}) 5002 @Deprecated 5003 public static final int FILL_PARENT = -1; 5004 5005 /** 5006 * Special value for the height or width requested by a View. 5007 * MATCH_PARENT means that the view wants to be as big as its parent, 5008 * minus the parent's padding, if any. Introduced in API Level 8. 5009 */ 5010 public static final int MATCH_PARENT = -1; 5011 5012 /** 5013 * Special value for the height or width requested by a View. 5014 * WRAP_CONTENT means that the view wants to be just large enough to fit 5015 * its own internal content, taking its own padding into account. 5016 */ 5017 public static final int WRAP_CONTENT = -2; 5018 5019 /** 5020 * Information about how wide the view wants to be. Can be one of the 5021 * constants FILL_PARENT (replaced by MATCH_PARENT , 5022 * in API Level 8) or WRAP_CONTENT. or an exact size. 5023 */ 5024 @ViewDebug.ExportedProperty(category = "layout", mapping = { 5025 @ViewDebug.IntToString(from = MATCH_PARENT, to = "MATCH_PARENT"), 5026 @ViewDebug.IntToString(from = WRAP_CONTENT, to = "WRAP_CONTENT") 5027 }) 5028 public int width; 5029 5030 /** 5031 * Information about how tall the view wants to be. Can be one of the 5032 * constants FILL_PARENT (replaced by MATCH_PARENT , 5033 * in API Level 8) or WRAP_CONTENT. or an exact size. 5034 */ 5035 @ViewDebug.ExportedProperty(category = "layout", mapping = { 5036 @ViewDebug.IntToString(from = MATCH_PARENT, to = "MATCH_PARENT"), 5037 @ViewDebug.IntToString(from = WRAP_CONTENT, to = "WRAP_CONTENT") 5038 }) 5039 public int height; 5040 5041 /** 5042 * Used to animate layouts. 5043 */ 5044 public LayoutAnimationController.AnimationParameters layoutAnimationParameters; 5045 5046 /** 5047 * Creates a new set of layout parameters. The values are extracted from 5048 * the supplied attributes set and context. The XML attributes mapped 5049 * to this set of layout parameters are: 5050 * 5051 * <ul> 5052 * <li><code>layout_width</code>: the width, either an exact value, 5053 * {@link #WRAP_CONTENT}, or {@link #FILL_PARENT} (replaced by 5054 * {@link #MATCH_PARENT} in API Level 8)</li> 5055 * <li><code>layout_height</code>: the height, either an exact value, 5056 * {@link #WRAP_CONTENT}, or {@link #FILL_PARENT} (replaced by 5057 * {@link #MATCH_PARENT} in API Level 8)</li> 5058 * </ul> 5059 * 5060 * @param c the application environment 5061 * @param attrs the set of attributes from which to extract the layout 5062 * parameters' values 5063 */ 5064 public LayoutParams(Context c, AttributeSet attrs) { 5065 TypedArray a = c.obtainStyledAttributes(attrs, R.styleable.ViewGroup_Layout); 5066 setBaseAttributes(a, 5067 R.styleable.ViewGroup_Layout_layout_width, 5068 R.styleable.ViewGroup_Layout_layout_height); 5069 a.recycle(); 5070 } 5071 5072 /** 5073 * Creates a new set of layout parameters with the specified width 5074 * and height. 5075 * 5076 * @param width the width, either {@link #WRAP_CONTENT}, 5077 * {@link #FILL_PARENT} (replaced by {@link #MATCH_PARENT} in 5078 * API Level 8), or a fixed size in pixels 5079 * @param height the height, either {@link #WRAP_CONTENT}, 5080 * {@link #FILL_PARENT} (replaced by {@link #MATCH_PARENT} in 5081 * API Level 8), or a fixed size in pixels 5082 */ 5083 public LayoutParams(int width, int height) { 5084 this.width = width; 5085 this.height = height; 5086 } 5087 5088 /** 5089 * Copy constructor. Clones the width and height values of the source. 5090 * 5091 * @param source The layout params to copy from. 5092 */ 5093 public LayoutParams(LayoutParams source) { 5094 this.width = source.width; 5095 this.height = source.height; 5096 } 5097 5098 /** 5099 * Used internally by MarginLayoutParams. 5100 * @hide 5101 */ 5102 LayoutParams() { 5103 } 5104 5105 /** 5106 * Extracts the layout parameters from the supplied attributes. 5107 * 5108 * @param a the style attributes to extract the parameters from 5109 * @param widthAttr the identifier of the width attribute 5110 * @param heightAttr the identifier of the height attribute 5111 */ 5112 protected void setBaseAttributes(TypedArray a, int widthAttr, int heightAttr) { 5113 width = a.getLayoutDimension(widthAttr, "layout_width"); 5114 height = a.getLayoutDimension(heightAttr, "layout_height"); 5115 } 5116 5117 /** 5118 * Resolve layout parameters depending on the layout direction. Subclasses that care about 5119 * layoutDirection changes should override this method. The default implementation does 5120 * nothing. 5121 * 5122 * @param layoutDirection the direction of the layout 5123 * 5124 * {@link View#LAYOUT_DIRECTION_LTR} 5125 * {@link View#LAYOUT_DIRECTION_RTL} 5126 * 5127 * @hide 5128 */ 5129 protected void resolveWithDirection(int layoutDirection) { 5130 } 5131 5132 /** 5133 * Returns a String representation of this set of layout parameters. 5134 * 5135 * @param output the String to prepend to the internal representation 5136 * @return a String with the following format: output + 5137 * "ViewGroup.LayoutParams={ width=WIDTH, height=HEIGHT }" 5138 * 5139 * @hide 5140 */ 5141 public String debug(String output) { 5142 return output + "ViewGroup.LayoutParams={ width=" 5143 + sizeToString(width) + ", height=" + sizeToString(height) + " }"; 5144 } 5145 5146 /** 5147 * Converts the specified size to a readable String. 5148 * 5149 * @param size the size to convert 5150 * @return a String instance representing the supplied size 5151 * 5152 * @hide 5153 */ 5154 protected static String sizeToString(int size) { 5155 if (size == WRAP_CONTENT) { 5156 return "wrap-content"; 5157 } 5158 if (size == MATCH_PARENT) { 5159 return "match-parent"; 5160 } 5161 return String.valueOf(size); 5162 } 5163 } 5164 5165 /** 5166 * Per-child layout information for layouts that support margins. 5167 * See 5168 * {@link android.R.styleable#ViewGroup_MarginLayout ViewGroup Margin Layout Attributes} 5169 * for a list of all child view attributes that this class supports. 5170 */ 5171 public static class MarginLayoutParams extends ViewGroup.LayoutParams { 5172 /** 5173 * The left margin in pixels of the child. 5174 * Call {@link ViewGroup#setLayoutParams(LayoutParams)} after reassigning a new value 5175 * to this field. 5176 */ 5177 @ViewDebug.ExportedProperty(category = "layout") 5178 public int leftMargin; 5179 5180 /** 5181 * The top margin in pixels of the child. 5182 * Call {@link ViewGroup#setLayoutParams(LayoutParams)} after reassigning a new value 5183 * to this field. 5184 */ 5185 @ViewDebug.ExportedProperty(category = "layout") 5186 public int topMargin; 5187 5188 /** 5189 * The right margin in pixels of the child. 5190 * Call {@link ViewGroup#setLayoutParams(LayoutParams)} after reassigning a new value 5191 * to this field. 5192 */ 5193 @ViewDebug.ExportedProperty(category = "layout") 5194 public int rightMargin; 5195 5196 /** 5197 * The bottom margin in pixels of the child. 5198 * Call {@link ViewGroup#setLayoutParams(LayoutParams)} after reassigning a new value 5199 * to this field. 5200 */ 5201 @ViewDebug.ExportedProperty(category = "layout") 5202 public int bottomMargin; 5203 5204 /** 5205 * The start margin in pixels of the child. 5206 * Call {@link ViewGroup#setLayoutParams(LayoutParams)} after reassigning a new value 5207 * to this field. 5208 */ 5209 @ViewDebug.ExportedProperty(category = "layout") 5210 public int startMargin = DEFAULT_RELATIVE; 5211 5212 /** 5213 * The end margin in pixels of the child. 5214 * Call {@link ViewGroup#setLayoutParams(LayoutParams)} after reassigning a new value 5215 * to this field. 5216 */ 5217 @ViewDebug.ExportedProperty(category = "layout") 5218 public int endMargin = DEFAULT_RELATIVE; 5219 5220 /** 5221 * The default start and end margin. 5222 */ 5223 static private final int DEFAULT_RELATIVE = Integer.MIN_VALUE; 5224 5225 /** 5226 * Creates a new set of layout parameters. The values are extracted from 5227 * the supplied attributes set and context. 5228 * 5229 * @param c the application environment 5230 * @param attrs the set of attributes from which to extract the layout 5231 * parameters' values 5232 */ 5233 public MarginLayoutParams(Context c, AttributeSet attrs) { 5234 super(); 5235 5236 TypedArray a = c.obtainStyledAttributes(attrs, R.styleable.ViewGroup_MarginLayout); 5237 setBaseAttributes(a, 5238 R.styleable.ViewGroup_MarginLayout_layout_width, 5239 R.styleable.ViewGroup_MarginLayout_layout_height); 5240 5241 int margin = a.getDimensionPixelSize( 5242 com.android.internal.R.styleable.ViewGroup_MarginLayout_layout_margin, -1); 5243 if (margin >= 0) { 5244 leftMargin = margin; 5245 topMargin = margin; 5246 rightMargin= margin; 5247 bottomMargin = margin; 5248 } else { 5249 leftMargin = a.getDimensionPixelSize( 5250 R.styleable.ViewGroup_MarginLayout_layout_marginLeft, 0); 5251 topMargin = a.getDimensionPixelSize( 5252 R.styleable.ViewGroup_MarginLayout_layout_marginTop, 0); 5253 rightMargin = a.getDimensionPixelSize( 5254 R.styleable.ViewGroup_MarginLayout_layout_marginRight, 0); 5255 bottomMargin = a.getDimensionPixelSize( 5256 R.styleable.ViewGroup_MarginLayout_layout_marginBottom, 0); 5257 startMargin = a.getDimensionPixelSize( 5258 R.styleable.ViewGroup_MarginLayout_layout_marginStart, DEFAULT_RELATIVE); 5259 endMargin = a.getDimensionPixelSize( 5260 R.styleable.ViewGroup_MarginLayout_layout_marginEnd, DEFAULT_RELATIVE); 5261 } 5262 5263 a.recycle(); 5264 } 5265 5266 /** 5267 * {@inheritDoc} 5268 */ 5269 public MarginLayoutParams(int width, int height) { 5270 super(width, height); 5271 } 5272 5273 /** 5274 * Copy constructor. Clones the width, height and margin values of the source. 5275 * 5276 * @param source The layout params to copy from. 5277 */ 5278 public MarginLayoutParams(MarginLayoutParams source) { 5279 this.width = source.width; 5280 this.height = source.height; 5281 5282 this.leftMargin = source.leftMargin; 5283 this.topMargin = source.topMargin; 5284 this.rightMargin = source.rightMargin; 5285 this.bottomMargin = source.bottomMargin; 5286 this.startMargin = source.startMargin; 5287 this.endMargin = source.endMargin; 5288 } 5289 5290 /** 5291 * {@inheritDoc} 5292 */ 5293 public MarginLayoutParams(LayoutParams source) { 5294 super(source); 5295 } 5296 5297 /** 5298 * Sets the margins, in pixels. A call to {@link android.view.View#requestLayout()} needs 5299 * to be done so that the new margins are taken into account. Left and right margins may be 5300 * overriden by {@link android.view.View#requestLayout()} depending on layout direction. 5301 * 5302 * @param left the left margin size 5303 * @param top the top margin size 5304 * @param right the right margin size 5305 * @param bottom the bottom margin size 5306 * 5307 * @attr ref android.R.styleable#ViewGroup_MarginLayout_layout_marginLeft 5308 * @attr ref android.R.styleable#ViewGroup_MarginLayout_layout_marginTop 5309 * @attr ref android.R.styleable#ViewGroup_MarginLayout_layout_marginRight 5310 * @attr ref android.R.styleable#ViewGroup_MarginLayout_layout_marginBottom 5311 */ 5312 public void setMargins(int left, int top, int right, int bottom) { 5313 leftMargin = left; 5314 topMargin = top; 5315 rightMargin = right; 5316 bottomMargin = bottom; 5317 } 5318 5319 /** 5320 * Sets the relative margins, in pixels. A call to {@link android.view.View#requestLayout()} 5321 * needs to be done so that the new relative margins are taken into account. Left and right 5322 * margins may be overriden by {@link android.view.View#requestLayout()} depending on layout 5323 * direction. 5324 * 5325 * @param start the start margin size 5326 * @param top the top margin size 5327 * @param end the right margin size 5328 * @param bottom the bottom margin size 5329 * 5330 * @attr ref android.R.styleable#ViewGroup_MarginLayout_layout_marginStart 5331 * @attr ref android.R.styleable#ViewGroup_MarginLayout_layout_marginTop 5332 * @attr ref android.R.styleable#ViewGroup_MarginLayout_layout_marginEnd 5333 * @attr ref android.R.styleable#ViewGroup_MarginLayout_layout_marginBottom 5334 * 5335 * @hide 5336 */ 5337 public void setMarginsRelative(int start, int top, int end, int bottom) { 5338 startMargin = start; 5339 topMargin = top; 5340 endMargin = end; 5341 bottomMargin = bottom; 5342 } 5343 5344 /** 5345 * Returns the start margin in pixels. 5346 * 5347 * @attr ref android.R.styleable#ViewGroup_MarginLayout_layout_marginStart 5348 * 5349 * @return the start margin in pixels. 5350 */ 5351 public int getMarginStart() { 5352 return startMargin; 5353 } 5354 5355 /** 5356 * Returns the end margin in pixels. 5357 * 5358 * @attr ref android.R.styleable#ViewGroup_MarginLayout_layout_marginEnd 5359 * 5360 * @return the end margin in pixels. 5361 */ 5362 public int getMarginEnd() { 5363 return endMargin; 5364 } 5365 5366 /** 5367 * Check if margins are relative. 5368 * 5369 * @attr ref android.R.styleable#ViewGroup_MarginLayout_layout_marginStart 5370 * @attr ref android.R.styleable#ViewGroup_MarginLayout_layout_marginEnd 5371 * 5372 * @return true if either marginStart or marginEnd has been set 5373 */ 5374 public boolean isMarginRelative() { 5375 return (startMargin != DEFAULT_RELATIVE) || (endMargin != DEFAULT_RELATIVE); 5376 } 5377 5378 /** 5379 * This will be called by {@link android.view.View#requestLayout()}. Left and Right margins 5380 * maybe overriden depending on layout direction. 5381 * 5382 * @hide 5383 */ 5384 @Override 5385 protected void resolveWithDirection(int layoutDirection) { 5386 switch(layoutDirection) { 5387 case View.LAYOUT_DIRECTION_RTL: 5388 leftMargin = (endMargin > DEFAULT_RELATIVE) ? endMargin : leftMargin; 5389 rightMargin = (startMargin > DEFAULT_RELATIVE) ? startMargin : rightMargin; 5390 break; 5391 case View.LAYOUT_DIRECTION_LTR: 5392 default: 5393 leftMargin = (startMargin > DEFAULT_RELATIVE) ? startMargin : leftMargin; 5394 rightMargin = (endMargin > DEFAULT_RELATIVE) ? endMargin : rightMargin; 5395 break; 5396 } 5397 } 5398 } 5399 5400 /* Describes a touched view and the ids of the pointers that it has captured. 5401 * 5402 * This code assumes that pointer ids are always in the range 0..31 such that 5403 * it can use a bitfield to track which pointer ids are present. 5404 * As it happens, the lower layers of the input dispatch pipeline also use the 5405 * same trick so the assumption should be safe here... 5406 */ 5407 private static final class TouchTarget { 5408 private static final int MAX_RECYCLED = 32; 5409 private static final Object sRecycleLock = new Object(); 5410 private static TouchTarget sRecycleBin; 5411 private static int sRecycledCount; 5412 5413 public static final int ALL_POINTER_IDS = -1; // all ones 5414 5415 // The touched child view. 5416 public View child; 5417 5418 // The combined bit mask of pointer ids for all pointers captured by the target. 5419 public int pointerIdBits; 5420 5421 // The next target in the target list. 5422 public TouchTarget next; 5423 5424 private TouchTarget() { 5425 } 5426 5427 public static TouchTarget obtain(View child, int pointerIdBits) { 5428 final TouchTarget target; 5429 synchronized (sRecycleLock) { 5430 if (sRecycleBin == null) { 5431 target = new TouchTarget(); 5432 } else { 5433 target = sRecycleBin; 5434 sRecycleBin = target.next; 5435 sRecycledCount--; 5436 target.next = null; 5437 } 5438 } 5439 target.child = child; 5440 target.pointerIdBits = pointerIdBits; 5441 return target; 5442 } 5443 5444 public void recycle() { 5445 synchronized (sRecycleLock) { 5446 if (sRecycledCount < MAX_RECYCLED) { 5447 next = sRecycleBin; 5448 sRecycleBin = this; 5449 sRecycledCount += 1; 5450 } else { 5451 next = null; 5452 } 5453 child = null; 5454 } 5455 } 5456 } 5457 5458 /* Describes a hovered view. */ 5459 private static final class HoverTarget { 5460 private static final int MAX_RECYCLED = 32; 5461 private static final Object sRecycleLock = new Object(); 5462 private static HoverTarget sRecycleBin; 5463 private static int sRecycledCount; 5464 5465 // The hovered child view. 5466 public View child; 5467 5468 // The next target in the target list. 5469 public HoverTarget next; 5470 5471 private HoverTarget() { 5472 } 5473 5474 public static HoverTarget obtain(View child) { 5475 final HoverTarget target; 5476 synchronized (sRecycleLock) { 5477 if (sRecycleBin == null) { 5478 target = new HoverTarget(); 5479 } else { 5480 target = sRecycleBin; 5481 sRecycleBin = target.next; 5482 sRecycledCount--; 5483 target.next = null; 5484 } 5485 } 5486 target.child = child; 5487 return target; 5488 } 5489 5490 public void recycle() { 5491 synchronized (sRecycleLock) { 5492 if (sRecycledCount < MAX_RECYCLED) { 5493 next = sRecycleBin; 5494 sRecycleBin = this; 5495 sRecycledCount += 1; 5496 } else { 5497 next = null; 5498 } 5499 child = null; 5500 } 5501 } 5502 } 5503} 5504