ViewGroup.java revision 57cadf2a97a81e5bea49bac573249076ebd95a93
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 * @hide 924 */ 925 @Override 926 public void makeOptionalFitsSystemWindows() { 927 super.makeOptionalFitsSystemWindows(); 928 final int count = mChildrenCount; 929 final View[] children = mChildren; 930 for (int i = 0; i < count; i++) { 931 children[i].makeOptionalFitsSystemWindows(); 932 } 933 } 934 935 /** 936 * {@inheritDoc} 937 */ 938 @Override 939 public void dispatchDisplayHint(int hint) { 940 super.dispatchDisplayHint(hint); 941 final int count = mChildrenCount; 942 final View[] children = mChildren; 943 for (int i = 0; i < count; i++) { 944 children[i].dispatchDisplayHint(hint); 945 } 946 } 947 948 /** 949 * Called when a view's visibility has changed. Notify the parent to take any appropriate 950 * action. 951 * 952 * @param child The view whose visibility has changed 953 * @param oldVisibility The previous visibility value (GONE, INVISIBLE, or VISIBLE). 954 * @param newVisibility The new visibility value (GONE, INVISIBLE, or VISIBLE). 955 * @hide 956 */ 957 protected void onChildVisibilityChanged(View child, int oldVisibility, int newVisibility) { 958 if (mTransition != null) { 959 if (newVisibility == VISIBLE) { 960 mTransition.showChild(this, child, oldVisibility); 961 } else { 962 mTransition.hideChild(this, child, newVisibility); 963 // Only track this on disappearing views - appearing views are already visible 964 // and don't need special handling during drawChild() 965 if (mVisibilityChangingChildren == null) { 966 mVisibilityChangingChildren = new ArrayList<View>(); 967 } 968 mVisibilityChangingChildren.add(child); 969 if (mTransitioningViews != null && mTransitioningViews.contains(child)) { 970 addDisappearingView(child); 971 } 972 } 973 } 974 975 // in all cases, for drags 976 if (mCurrentDrag != null) { 977 if (newVisibility == VISIBLE) { 978 notifyChildOfDrag(child); 979 } 980 } 981 } 982 983 /** 984 * {@inheritDoc} 985 */ 986 @Override 987 protected void dispatchVisibilityChanged(View changedView, int visibility) { 988 super.dispatchVisibilityChanged(changedView, visibility); 989 final int count = mChildrenCount; 990 final View[] children = mChildren; 991 for (int i = 0; i < count; i++) { 992 children[i].dispatchVisibilityChanged(changedView, visibility); 993 } 994 } 995 996 /** 997 * {@inheritDoc} 998 */ 999 @Override 1000 public void dispatchWindowVisibilityChanged(int visibility) { 1001 super.dispatchWindowVisibilityChanged(visibility); 1002 final int count = mChildrenCount; 1003 final View[] children = mChildren; 1004 for (int i = 0; i < count; i++) { 1005 children[i].dispatchWindowVisibilityChanged(visibility); 1006 } 1007 } 1008 1009 /** 1010 * {@inheritDoc} 1011 */ 1012 @Override 1013 public void dispatchConfigurationChanged(Configuration newConfig) { 1014 super.dispatchConfigurationChanged(newConfig); 1015 final int count = mChildrenCount; 1016 final View[] children = mChildren; 1017 for (int i = 0; i < count; i++) { 1018 children[i].dispatchConfigurationChanged(newConfig); 1019 } 1020 } 1021 1022 /** 1023 * {@inheritDoc} 1024 */ 1025 public void recomputeViewAttributes(View child) { 1026 if (mAttachInfo != null && !mAttachInfo.mRecomputeGlobalAttributes) { 1027 ViewParent parent = mParent; 1028 if (parent != null) parent.recomputeViewAttributes(this); 1029 } 1030 } 1031 1032 @Override 1033 void dispatchCollectViewAttributes(AttachInfo attachInfo, int visibility) { 1034 if ((visibility & VISIBILITY_MASK) == VISIBLE) { 1035 super.dispatchCollectViewAttributes(attachInfo, visibility); 1036 final int count = mChildrenCount; 1037 final View[] children = mChildren; 1038 for (int i = 0; i < count; i++) { 1039 final View child = children[i]; 1040 child.dispatchCollectViewAttributes(attachInfo, 1041 visibility | (child.mViewFlags&VISIBILITY_MASK)); 1042 } 1043 } 1044 } 1045 1046 /** 1047 * {@inheritDoc} 1048 */ 1049 public void bringChildToFront(View child) { 1050 int index = indexOfChild(child); 1051 if (index >= 0) { 1052 removeFromArray(index); 1053 addInArray(child, mChildrenCount); 1054 child.mParent = this; 1055 } 1056 } 1057 1058 /** 1059 * {@inheritDoc} 1060 */ 1061 // TODO: Write real docs 1062 @Override 1063 public boolean dispatchDragEvent(DragEvent event) { 1064 boolean retval = false; 1065 final float tx = event.mX; 1066 final float ty = event.mY; 1067 1068 ViewRootImpl root = getViewRootImpl(); 1069 1070 // Dispatch down the view hierarchy 1071 switch (event.mAction) { 1072 case DragEvent.ACTION_DRAG_STARTED: { 1073 // clear state to recalculate which views we drag over 1074 mCurrentDragView = null; 1075 1076 // Set up our tracking of drag-started notifications 1077 mCurrentDrag = DragEvent.obtain(event); 1078 if (mDragNotifiedChildren == null) { 1079 mDragNotifiedChildren = new HashSet<View>(); 1080 } else { 1081 mDragNotifiedChildren.clear(); 1082 } 1083 1084 // Now dispatch down to our children, caching the responses 1085 mChildAcceptsDrag = false; 1086 final int count = mChildrenCount; 1087 final View[] children = mChildren; 1088 for (int i = 0; i < count; i++) { 1089 final View child = children[i]; 1090 child.mPrivateFlags2 &= ~View.DRAG_MASK; 1091 if (child.getVisibility() == VISIBLE) { 1092 final boolean handled = notifyChildOfDrag(children[i]); 1093 if (handled) { 1094 mChildAcceptsDrag = true; 1095 } 1096 } 1097 } 1098 1099 // Return HANDLED if one of our children can accept the drag 1100 if (mChildAcceptsDrag) { 1101 retval = true; 1102 } 1103 } break; 1104 1105 case DragEvent.ACTION_DRAG_ENDED: { 1106 // Release the bookkeeping now that the drag lifecycle has ended 1107 if (mDragNotifiedChildren != null) { 1108 for (View child : mDragNotifiedChildren) { 1109 // If a child was notified about an ongoing drag, it's told that it's over 1110 child.dispatchDragEvent(event); 1111 child.mPrivateFlags2 &= ~View.DRAG_MASK; 1112 child.refreshDrawableState(); 1113 } 1114 1115 mDragNotifiedChildren.clear(); 1116 mCurrentDrag.recycle(); 1117 mCurrentDrag = null; 1118 } 1119 1120 // We consider drag-ended to have been handled if one of our children 1121 // had offered to handle the drag. 1122 if (mChildAcceptsDrag) { 1123 retval = true; 1124 } 1125 } break; 1126 1127 case DragEvent.ACTION_DRAG_LOCATION: { 1128 // Find the [possibly new] drag target 1129 final View target = findFrontmostDroppableChildAt(event.mX, event.mY, mLocalPoint); 1130 1131 // If we've changed apparent drag target, tell the view root which view 1132 // we're over now [for purposes of the eventual drag-recipient-changed 1133 // notifications to the framework] and tell the new target that the drag 1134 // has entered its bounds. The root will see setDragFocus() calls all 1135 // the way down to the final leaf view that is handling the LOCATION event 1136 // before reporting the new potential recipient to the framework. 1137 if (mCurrentDragView != target) { 1138 root.setDragFocus(target); 1139 1140 final int action = event.mAction; 1141 // If we've dragged off of a child view, send it the EXITED message 1142 if (mCurrentDragView != null) { 1143 final View view = mCurrentDragView; 1144 event.mAction = DragEvent.ACTION_DRAG_EXITED; 1145 view.dispatchDragEvent(event); 1146 view.mPrivateFlags2 &= ~View.DRAG_HOVERED; 1147 view.refreshDrawableState(); 1148 } 1149 mCurrentDragView = target; 1150 1151 // If we've dragged over a new child view, send it the ENTERED message 1152 if (target != null) { 1153 event.mAction = DragEvent.ACTION_DRAG_ENTERED; 1154 target.dispatchDragEvent(event); 1155 target.mPrivateFlags2 |= View.DRAG_HOVERED; 1156 target.refreshDrawableState(); 1157 } 1158 event.mAction = action; // restore the event's original state 1159 } 1160 1161 // Dispatch the actual drag location notice, localized into its coordinates 1162 if (target != null) { 1163 event.mX = mLocalPoint.x; 1164 event.mY = mLocalPoint.y; 1165 1166 retval = target.dispatchDragEvent(event); 1167 1168 event.mX = tx; 1169 event.mY = ty; 1170 } 1171 } break; 1172 1173 /* Entered / exited dispatch 1174 * 1175 * DRAG_ENTERED is not dispatched downwards from ViewGroup. The reason for this is 1176 * that we're about to get the corresponding LOCATION event, which we will use to 1177 * determine which of our children is the new target; at that point we will 1178 * push a DRAG_ENTERED down to the new target child [which may itself be a ViewGroup]. 1179 * 1180 * DRAG_EXITED *is* dispatched all the way down immediately: once we know the 1181 * drag has left this ViewGroup, we know by definition that every contained subview 1182 * is also no longer under the drag point. 1183 */ 1184 1185 case DragEvent.ACTION_DRAG_EXITED: { 1186 if (mCurrentDragView != null) { 1187 final View view = mCurrentDragView; 1188 view.dispatchDragEvent(event); 1189 view.mPrivateFlags2 &= ~View.DRAG_HOVERED; 1190 view.refreshDrawableState(); 1191 1192 mCurrentDragView = null; 1193 } 1194 } break; 1195 1196 case DragEvent.ACTION_DROP: { 1197 if (ViewDebug.DEBUG_DRAG) Log.d(View.VIEW_LOG_TAG, "Drop event: " + event); 1198 View target = findFrontmostDroppableChildAt(event.mX, event.mY, mLocalPoint); 1199 if (target != null) { 1200 if (ViewDebug.DEBUG_DRAG) Log.d(View.VIEW_LOG_TAG, " dispatch drop to " + target); 1201 event.mX = mLocalPoint.x; 1202 event.mY = mLocalPoint.y; 1203 retval = target.dispatchDragEvent(event); 1204 event.mX = tx; 1205 event.mY = ty; 1206 } else { 1207 if (ViewDebug.DEBUG_DRAG) { 1208 Log.d(View.VIEW_LOG_TAG, " not dropped on an accepting view"); 1209 } 1210 } 1211 } break; 1212 } 1213 1214 // If none of our children could handle the event, try here 1215 if (!retval) { 1216 // Call up to the View implementation that dispatches to installed listeners 1217 retval = super.dispatchDragEvent(event); 1218 } 1219 return retval; 1220 } 1221 1222 // Find the frontmost child view that lies under the given point, and calculate 1223 // the position within its own local coordinate system. 1224 View findFrontmostDroppableChildAt(float x, float y, PointF outLocalPoint) { 1225 final int count = mChildrenCount; 1226 final View[] children = mChildren; 1227 for (int i = count - 1; i >= 0; i--) { 1228 final View child = children[i]; 1229 if (!child.canAcceptDrag()) { 1230 continue; 1231 } 1232 1233 if (isTransformedTouchPointInView(x, y, child, outLocalPoint)) { 1234 return child; 1235 } 1236 } 1237 return null; 1238 } 1239 1240 boolean notifyChildOfDrag(View child) { 1241 if (ViewDebug.DEBUG_DRAG) { 1242 Log.d(View.VIEW_LOG_TAG, "Sending drag-started to view: " + child); 1243 } 1244 1245 boolean canAccept = false; 1246 if (! mDragNotifiedChildren.contains(child)) { 1247 mDragNotifiedChildren.add(child); 1248 canAccept = child.dispatchDragEvent(mCurrentDrag); 1249 if (canAccept && !child.canAcceptDrag()) { 1250 child.mPrivateFlags2 |= View.DRAG_CAN_ACCEPT; 1251 child.refreshDrawableState(); 1252 } 1253 } 1254 return canAccept; 1255 } 1256 1257 @Override 1258 public void dispatchWindowSystemUiVisiblityChanged(int visible) { 1259 super.dispatchWindowSystemUiVisiblityChanged(visible); 1260 1261 final int count = mChildrenCount; 1262 final View[] children = mChildren; 1263 for (int i=0; i <count; i++) { 1264 final View child = children[i]; 1265 child.dispatchWindowSystemUiVisiblityChanged(visible); 1266 } 1267 } 1268 1269 @Override 1270 public void dispatchSystemUiVisibilityChanged(int visible) { 1271 super.dispatchSystemUiVisibilityChanged(visible); 1272 1273 final int count = mChildrenCount; 1274 final View[] children = mChildren; 1275 for (int i=0; i <count; i++) { 1276 final View child = children[i]; 1277 child.dispatchSystemUiVisibilityChanged(visible); 1278 } 1279 } 1280 1281 @Override 1282 void updateLocalSystemUiVisibility(int localValue, int localChanges) { 1283 super.updateLocalSystemUiVisibility(localValue, localChanges); 1284 1285 final int count = mChildrenCount; 1286 final View[] children = mChildren; 1287 for (int i=0; i <count; i++) { 1288 final View child = children[i]; 1289 child.updateLocalSystemUiVisibility(localValue, localChanges); 1290 } 1291 } 1292 1293 /** 1294 * {@inheritDoc} 1295 */ 1296 @Override 1297 public boolean dispatchKeyEventPreIme(KeyEvent event) { 1298 if ((mPrivateFlags & (FOCUSED | HAS_BOUNDS)) == (FOCUSED | HAS_BOUNDS)) { 1299 return super.dispatchKeyEventPreIme(event); 1300 } else if (mFocused != null && (mFocused.mPrivateFlags & HAS_BOUNDS) == HAS_BOUNDS) { 1301 return mFocused.dispatchKeyEventPreIme(event); 1302 } 1303 return false; 1304 } 1305 1306 /** 1307 * {@inheritDoc} 1308 */ 1309 @Override 1310 public boolean dispatchKeyEvent(KeyEvent event) { 1311 if (mInputEventConsistencyVerifier != null) { 1312 mInputEventConsistencyVerifier.onKeyEvent(event, 1); 1313 } 1314 1315 if ((mPrivateFlags & (FOCUSED | HAS_BOUNDS)) == (FOCUSED | HAS_BOUNDS)) { 1316 if (super.dispatchKeyEvent(event)) { 1317 return true; 1318 } 1319 } else if (mFocused != null && (mFocused.mPrivateFlags & HAS_BOUNDS) == HAS_BOUNDS) { 1320 if (mFocused.dispatchKeyEvent(event)) { 1321 return true; 1322 } 1323 } 1324 1325 if (mInputEventConsistencyVerifier != null) { 1326 mInputEventConsistencyVerifier.onUnhandledEvent(event, 1); 1327 } 1328 return false; 1329 } 1330 1331 /** 1332 * {@inheritDoc} 1333 */ 1334 @Override 1335 public boolean dispatchKeyShortcutEvent(KeyEvent event) { 1336 if ((mPrivateFlags & (FOCUSED | HAS_BOUNDS)) == (FOCUSED | HAS_BOUNDS)) { 1337 return super.dispatchKeyShortcutEvent(event); 1338 } else if (mFocused != null && (mFocused.mPrivateFlags & HAS_BOUNDS) == HAS_BOUNDS) { 1339 return mFocused.dispatchKeyShortcutEvent(event); 1340 } 1341 return false; 1342 } 1343 1344 /** 1345 * {@inheritDoc} 1346 */ 1347 @Override 1348 public boolean dispatchTrackballEvent(MotionEvent event) { 1349 if (mInputEventConsistencyVerifier != null) { 1350 mInputEventConsistencyVerifier.onTrackballEvent(event, 1); 1351 } 1352 1353 if ((mPrivateFlags & (FOCUSED | HAS_BOUNDS)) == (FOCUSED | HAS_BOUNDS)) { 1354 if (super.dispatchTrackballEvent(event)) { 1355 return true; 1356 } 1357 } else if (mFocused != null && (mFocused.mPrivateFlags & HAS_BOUNDS) == HAS_BOUNDS) { 1358 if (mFocused.dispatchTrackballEvent(event)) { 1359 return true; 1360 } 1361 } 1362 1363 if (mInputEventConsistencyVerifier != null) { 1364 mInputEventConsistencyVerifier.onUnhandledEvent(event, 1); 1365 } 1366 return false; 1367 } 1368 1369 /** 1370 * {@inheritDoc} 1371 */ 1372 @SuppressWarnings({"ConstantConditions"}) 1373 @Override 1374 protected boolean dispatchHoverEvent(MotionEvent event) { 1375 final int action = event.getAction(); 1376 1377 // First check whether the view group wants to intercept the hover event. 1378 final boolean interceptHover = onInterceptHoverEvent(event); 1379 event.setAction(action); // restore action in case it was changed 1380 1381 MotionEvent eventNoHistory = event; 1382 boolean handled = false; 1383 1384 // Send events to the hovered children and build a new list of hover targets until 1385 // one is found that handles the event. 1386 HoverTarget firstOldHoverTarget = mFirstHoverTarget; 1387 mFirstHoverTarget = null; 1388 if (!interceptHover && action != MotionEvent.ACTION_HOVER_EXIT) { 1389 final float x = event.getX(); 1390 final float y = event.getY(); 1391 final int childrenCount = mChildrenCount; 1392 if (childrenCount != 0) { 1393 final View[] children = mChildren; 1394 HoverTarget lastHoverTarget = null; 1395 for (int i = childrenCount - 1; i >= 0; i--) { 1396 final View child = children[i]; 1397 if (!canViewReceivePointerEvents(child) 1398 || !isTransformedTouchPointInView(x, y, child, null)) { 1399 continue; 1400 } 1401 1402 // Obtain a hover target for this child. Dequeue it from the 1403 // old hover target list if the child was previously hovered. 1404 HoverTarget hoverTarget = firstOldHoverTarget; 1405 final boolean wasHovered; 1406 for (HoverTarget predecessor = null; ;) { 1407 if (hoverTarget == null) { 1408 hoverTarget = HoverTarget.obtain(child); 1409 wasHovered = false; 1410 break; 1411 } 1412 1413 if (hoverTarget.child == child) { 1414 if (predecessor != null) { 1415 predecessor.next = hoverTarget.next; 1416 } else { 1417 firstOldHoverTarget = hoverTarget.next; 1418 } 1419 hoverTarget.next = null; 1420 wasHovered = true; 1421 break; 1422 } 1423 1424 predecessor = hoverTarget; 1425 hoverTarget = hoverTarget.next; 1426 } 1427 1428 // Enqueue the hover target onto the new hover target list. 1429 if (lastHoverTarget != null) { 1430 lastHoverTarget.next = hoverTarget; 1431 } else { 1432 lastHoverTarget = hoverTarget; 1433 mFirstHoverTarget = hoverTarget; 1434 } 1435 1436 // Dispatch the event to the child. 1437 if (action == MotionEvent.ACTION_HOVER_ENTER) { 1438 if (!wasHovered) { 1439 // Send the enter as is. 1440 handled |= dispatchTransformedGenericPointerEvent( 1441 event, child); // enter 1442 } 1443 } else if (action == MotionEvent.ACTION_HOVER_MOVE) { 1444 if (!wasHovered) { 1445 // Synthesize an enter from a move. 1446 eventNoHistory = obtainMotionEventNoHistoryOrSelf(eventNoHistory); 1447 eventNoHistory.setAction(MotionEvent.ACTION_HOVER_ENTER); 1448 handled |= dispatchTransformedGenericPointerEvent( 1449 eventNoHistory, child); // enter 1450 eventNoHistory.setAction(action); 1451 1452 handled |= dispatchTransformedGenericPointerEvent( 1453 eventNoHistory, child); // move 1454 } else { 1455 // Send the move as is. 1456 handled |= dispatchTransformedGenericPointerEvent(event, child); 1457 } 1458 } 1459 if (handled) { 1460 break; 1461 } 1462 } 1463 } 1464 } 1465 1466 // Send exit events to all previously hovered children that are no longer hovered. 1467 while (firstOldHoverTarget != null) { 1468 final View child = firstOldHoverTarget.child; 1469 1470 // Exit the old hovered child. 1471 if (action == MotionEvent.ACTION_HOVER_EXIT) { 1472 // Send the exit as is. 1473 handled |= dispatchTransformedGenericPointerEvent( 1474 event, child); // exit 1475 } else { 1476 // Synthesize an exit from a move or enter. 1477 // Ignore the result because hover focus has moved to a different view. 1478 if (action == MotionEvent.ACTION_HOVER_MOVE) { 1479 dispatchTransformedGenericPointerEvent( 1480 event, child); // move 1481 } 1482 eventNoHistory = obtainMotionEventNoHistoryOrSelf(eventNoHistory); 1483 eventNoHistory.setAction(MotionEvent.ACTION_HOVER_EXIT); 1484 dispatchTransformedGenericPointerEvent( 1485 eventNoHistory, child); // exit 1486 eventNoHistory.setAction(action); 1487 } 1488 1489 final HoverTarget nextOldHoverTarget = firstOldHoverTarget.next; 1490 firstOldHoverTarget.recycle(); 1491 firstOldHoverTarget = nextOldHoverTarget; 1492 } 1493 1494 // Send events to the view group itself if no children have handled it. 1495 boolean newHoveredSelf = !handled; 1496 if (newHoveredSelf == mHoveredSelf) { 1497 if (newHoveredSelf) { 1498 // Send event to the view group as before. 1499 handled |= super.dispatchHoverEvent(event); 1500 } 1501 } else { 1502 if (mHoveredSelf) { 1503 // Exit the view group. 1504 if (action == MotionEvent.ACTION_HOVER_EXIT) { 1505 // Send the exit as is. 1506 handled |= super.dispatchHoverEvent(event); // exit 1507 } else { 1508 // Synthesize an exit from a move or enter. 1509 // Ignore the result because hover focus is moving to a different view. 1510 if (action == MotionEvent.ACTION_HOVER_MOVE) { 1511 super.dispatchHoverEvent(event); // move 1512 } 1513 eventNoHistory = obtainMotionEventNoHistoryOrSelf(eventNoHistory); 1514 eventNoHistory.setAction(MotionEvent.ACTION_HOVER_EXIT); 1515 super.dispatchHoverEvent(eventNoHistory); // exit 1516 eventNoHistory.setAction(action); 1517 } 1518 mHoveredSelf = false; 1519 } 1520 1521 if (newHoveredSelf) { 1522 // Enter the view group. 1523 if (action == MotionEvent.ACTION_HOVER_ENTER) { 1524 // Send the enter as is. 1525 handled |= super.dispatchHoverEvent(event); // enter 1526 mHoveredSelf = true; 1527 } else if (action == MotionEvent.ACTION_HOVER_MOVE) { 1528 // Synthesize an enter from a move. 1529 eventNoHistory = obtainMotionEventNoHistoryOrSelf(eventNoHistory); 1530 eventNoHistory.setAction(MotionEvent.ACTION_HOVER_ENTER); 1531 handled |= super.dispatchHoverEvent(eventNoHistory); // enter 1532 eventNoHistory.setAction(action); 1533 1534 handled |= super.dispatchHoverEvent(eventNoHistory); // move 1535 mHoveredSelf = true; 1536 } 1537 } 1538 } 1539 1540 // Recycle the copy of the event that we made. 1541 if (eventNoHistory != event) { 1542 eventNoHistory.recycle(); 1543 } 1544 1545 // Done. 1546 return handled; 1547 } 1548 1549 /** @hide */ 1550 @Override 1551 protected boolean hasHoveredChild() { 1552 return mFirstHoverTarget != null; 1553 } 1554 1555 /** 1556 * Implement this method to intercept hover events before they are handled 1557 * by child views. 1558 * <p> 1559 * This method is called before dispatching a hover event to a child of 1560 * the view group or to the view group's own {@link #onHoverEvent} to allow 1561 * the view group a chance to intercept the hover event. 1562 * This method can also be used to watch all pointer motions that occur within 1563 * the bounds of the view group even when the pointer is hovering over 1564 * a child of the view group rather than over the view group itself. 1565 * </p><p> 1566 * The view group can prevent its children from receiving hover events by 1567 * implementing this method and returning <code>true</code> to indicate 1568 * that it would like to intercept hover events. The view group must 1569 * continuously return <code>true</code> from {@link #onInterceptHoverEvent} 1570 * for as long as it wishes to continue intercepting hover events from 1571 * its children. 1572 * </p><p> 1573 * Interception preserves the invariant that at most one view can be 1574 * hovered at a time by transferring hover focus from the currently hovered 1575 * child to the view group or vice-versa as needed. 1576 * </p><p> 1577 * If this method returns <code>true</code> and a child is already hovered, then the 1578 * child view will first receive a hover exit event and then the view group 1579 * itself will receive a hover enter event in {@link #onHoverEvent}. 1580 * Likewise, if this method had previously returned <code>true</code> to intercept hover 1581 * events and instead returns <code>false</code> while the pointer is hovering 1582 * within the bounds of one of a child, then the view group will first receive a 1583 * hover exit event in {@link #onHoverEvent} and then the hovered child will 1584 * receive a hover enter event. 1585 * </p><p> 1586 * The default implementation always returns false. 1587 * </p> 1588 * 1589 * @param event The motion event that describes the hover. 1590 * @return True if the view group would like to intercept the hover event 1591 * and prevent its children from receiving it. 1592 */ 1593 public boolean onInterceptHoverEvent(MotionEvent event) { 1594 return false; 1595 } 1596 1597 private static MotionEvent obtainMotionEventNoHistoryOrSelf(MotionEvent event) { 1598 if (event.getHistorySize() == 0) { 1599 return event; 1600 } 1601 return MotionEvent.obtainNoHistory(event); 1602 } 1603 1604 /** 1605 * {@inheritDoc} 1606 */ 1607 @Override 1608 protected boolean dispatchGenericPointerEvent(MotionEvent event) { 1609 // Send the event to the child under the pointer. 1610 final int childrenCount = mChildrenCount; 1611 if (childrenCount != 0) { 1612 final View[] children = mChildren; 1613 final float x = event.getX(); 1614 final float y = event.getY(); 1615 1616 for (int i = childrenCount - 1; i >= 0; i--) { 1617 final View child = children[i]; 1618 if (!canViewReceivePointerEvents(child) 1619 || !isTransformedTouchPointInView(x, y, child, null)) { 1620 continue; 1621 } 1622 1623 if (dispatchTransformedGenericPointerEvent(event, child)) { 1624 return true; 1625 } 1626 } 1627 } 1628 1629 // No child handled the event. Send it to this view group. 1630 return super.dispatchGenericPointerEvent(event); 1631 } 1632 1633 /** 1634 * {@inheritDoc} 1635 */ 1636 @Override 1637 protected boolean dispatchGenericFocusedEvent(MotionEvent event) { 1638 // Send the event to the focused child or to this view group if it has focus. 1639 if ((mPrivateFlags & (FOCUSED | HAS_BOUNDS)) == (FOCUSED | HAS_BOUNDS)) { 1640 return super.dispatchGenericFocusedEvent(event); 1641 } else if (mFocused != null && (mFocused.mPrivateFlags & HAS_BOUNDS) == HAS_BOUNDS) { 1642 return mFocused.dispatchGenericMotionEvent(event); 1643 } 1644 return false; 1645 } 1646 1647 /** 1648 * Dispatches a generic pointer event to a child, taking into account 1649 * transformations that apply to the child. 1650 * 1651 * @param event The event to send. 1652 * @param child The view to send the event to. 1653 * @return {@code true} if the child handled the event. 1654 */ 1655 private boolean dispatchTransformedGenericPointerEvent(MotionEvent event, View child) { 1656 final float offsetX = mScrollX - child.mLeft; 1657 final float offsetY = mScrollY - child.mTop; 1658 1659 boolean handled; 1660 if (!child.hasIdentityMatrix()) { 1661 MotionEvent transformedEvent = MotionEvent.obtain(event); 1662 transformedEvent.offsetLocation(offsetX, offsetY); 1663 transformedEvent.transform(child.getInverseMatrix()); 1664 handled = child.dispatchGenericMotionEvent(transformedEvent); 1665 transformedEvent.recycle(); 1666 } else { 1667 event.offsetLocation(offsetX, offsetY); 1668 handled = child.dispatchGenericMotionEvent(event); 1669 event.offsetLocation(-offsetX, -offsetY); 1670 } 1671 return handled; 1672 } 1673 1674 /** 1675 * {@inheritDoc} 1676 */ 1677 @Override 1678 public boolean dispatchTouchEvent(MotionEvent ev) { 1679 if (mInputEventConsistencyVerifier != null) { 1680 mInputEventConsistencyVerifier.onTouchEvent(ev, 1); 1681 } 1682 1683 boolean handled = false; 1684 if (onFilterTouchEventForSecurity(ev)) { 1685 final int action = ev.getAction(); 1686 final int actionMasked = action & MotionEvent.ACTION_MASK; 1687 1688 // Handle an initial down. 1689 if (actionMasked == MotionEvent.ACTION_DOWN) { 1690 // Throw away all previous state when starting a new touch gesture. 1691 // The framework may have dropped the up or cancel event for the previous gesture 1692 // due to an app switch, ANR, or some other state change. 1693 cancelAndClearTouchTargets(ev); 1694 resetTouchState(); 1695 } 1696 1697 // Check for interception. 1698 final boolean intercepted; 1699 if (actionMasked == MotionEvent.ACTION_DOWN 1700 || mFirstTouchTarget != null) { 1701 final boolean disallowIntercept = (mGroupFlags & FLAG_DISALLOW_INTERCEPT) != 0; 1702 if (!disallowIntercept) { 1703 intercepted = onInterceptTouchEvent(ev); 1704 ev.setAction(action); // restore action in case it was changed 1705 } else { 1706 intercepted = false; 1707 } 1708 } else { 1709 // There are no touch targets and this action is not an initial down 1710 // so this view group continues to intercept touches. 1711 intercepted = true; 1712 } 1713 1714 // Check for cancelation. 1715 final boolean canceled = resetCancelNextUpFlag(this) 1716 || actionMasked == MotionEvent.ACTION_CANCEL; 1717 1718 // Update list of touch targets for pointer down, if needed. 1719 final boolean split = (mGroupFlags & FLAG_SPLIT_MOTION_EVENTS) != 0; 1720 TouchTarget newTouchTarget = null; 1721 boolean alreadyDispatchedToNewTouchTarget = false; 1722 if (!canceled && !intercepted) { 1723 if (actionMasked == MotionEvent.ACTION_DOWN 1724 || (split && actionMasked == MotionEvent.ACTION_POINTER_DOWN) 1725 || actionMasked == MotionEvent.ACTION_HOVER_MOVE) { 1726 final int actionIndex = ev.getActionIndex(); // always 0 for down 1727 final int idBitsToAssign = split ? 1 << ev.getPointerId(actionIndex) 1728 : TouchTarget.ALL_POINTER_IDS; 1729 1730 // Clean up earlier touch targets for this pointer id in case they 1731 // have become out of sync. 1732 removePointersFromTouchTargets(idBitsToAssign); 1733 1734 final int childrenCount = mChildrenCount; 1735 if (childrenCount != 0) { 1736 // Find a child that can receive the event. 1737 // Scan children from front to back. 1738 final View[] children = mChildren; 1739 final float x = ev.getX(actionIndex); 1740 final float y = ev.getY(actionIndex); 1741 1742 for (int i = childrenCount - 1; i >= 0; i--) { 1743 final View child = children[i]; 1744 if (!canViewReceivePointerEvents(child) 1745 || !isTransformedTouchPointInView(x, y, child, null)) { 1746 continue; 1747 } 1748 1749 newTouchTarget = getTouchTarget(child); 1750 if (newTouchTarget != null) { 1751 // Child is already receiving touch within its bounds. 1752 // Give it the new pointer in addition to the ones it is handling. 1753 newTouchTarget.pointerIdBits |= idBitsToAssign; 1754 break; 1755 } 1756 1757 resetCancelNextUpFlag(child); 1758 if (dispatchTransformedTouchEvent(ev, false, child, idBitsToAssign)) { 1759 // Child wants to receive touch within its bounds. 1760 mLastTouchDownTime = ev.getDownTime(); 1761 mLastTouchDownIndex = i; 1762 mLastTouchDownX = ev.getX(); 1763 mLastTouchDownY = ev.getY(); 1764 newTouchTarget = addTouchTarget(child, idBitsToAssign); 1765 alreadyDispatchedToNewTouchTarget = true; 1766 break; 1767 } 1768 } 1769 } 1770 1771 if (newTouchTarget == null && mFirstTouchTarget != null) { 1772 // Did not find a child to receive the event. 1773 // Assign the pointer to the least recently added target. 1774 newTouchTarget = mFirstTouchTarget; 1775 while (newTouchTarget.next != null) { 1776 newTouchTarget = newTouchTarget.next; 1777 } 1778 newTouchTarget.pointerIdBits |= idBitsToAssign; 1779 } 1780 } 1781 } 1782 1783 // Dispatch to touch targets. 1784 if (mFirstTouchTarget == null) { 1785 // No touch targets so treat this as an ordinary view. 1786 handled = dispatchTransformedTouchEvent(ev, canceled, null, 1787 TouchTarget.ALL_POINTER_IDS); 1788 } else { 1789 // Dispatch to touch targets, excluding the new touch target if we already 1790 // dispatched to it. Cancel touch targets if necessary. 1791 TouchTarget predecessor = null; 1792 TouchTarget target = mFirstTouchTarget; 1793 while (target != null) { 1794 final TouchTarget next = target.next; 1795 if (alreadyDispatchedToNewTouchTarget && target == newTouchTarget) { 1796 handled = true; 1797 } else { 1798 final boolean cancelChild = resetCancelNextUpFlag(target.child) 1799 || intercepted; 1800 if (dispatchTransformedTouchEvent(ev, cancelChild, 1801 target.child, target.pointerIdBits)) { 1802 handled = true; 1803 } 1804 if (cancelChild) { 1805 if (predecessor == null) { 1806 mFirstTouchTarget = next; 1807 } else { 1808 predecessor.next = next; 1809 } 1810 target.recycle(); 1811 target = next; 1812 continue; 1813 } 1814 } 1815 predecessor = target; 1816 target = next; 1817 } 1818 } 1819 1820 // Update list of touch targets for pointer up or cancel, if needed. 1821 if (canceled 1822 || actionMasked == MotionEvent.ACTION_UP 1823 || actionMasked == MotionEvent.ACTION_HOVER_MOVE) { 1824 resetTouchState(); 1825 } else if (split && actionMasked == MotionEvent.ACTION_POINTER_UP) { 1826 final int actionIndex = ev.getActionIndex(); 1827 final int idBitsToRemove = 1 << ev.getPointerId(actionIndex); 1828 removePointersFromTouchTargets(idBitsToRemove); 1829 } 1830 } 1831 1832 if (!handled && mInputEventConsistencyVerifier != null) { 1833 mInputEventConsistencyVerifier.onUnhandledEvent(ev, 1); 1834 } 1835 return handled; 1836 } 1837 1838 /** 1839 * Resets all touch state in preparation for a new cycle. 1840 */ 1841 private void resetTouchState() { 1842 clearTouchTargets(); 1843 resetCancelNextUpFlag(this); 1844 mGroupFlags &= ~FLAG_DISALLOW_INTERCEPT; 1845 } 1846 1847 /** 1848 * Resets the cancel next up flag. 1849 * Returns true if the flag was previously set. 1850 */ 1851 private static boolean resetCancelNextUpFlag(View view) { 1852 if ((view.mPrivateFlags & CANCEL_NEXT_UP_EVENT) != 0) { 1853 view.mPrivateFlags &= ~CANCEL_NEXT_UP_EVENT; 1854 return true; 1855 } 1856 return false; 1857 } 1858 1859 /** 1860 * Clears all touch targets. 1861 */ 1862 private void clearTouchTargets() { 1863 TouchTarget target = mFirstTouchTarget; 1864 if (target != null) { 1865 do { 1866 TouchTarget next = target.next; 1867 target.recycle(); 1868 target = next; 1869 } while (target != null); 1870 mFirstTouchTarget = null; 1871 } 1872 } 1873 1874 /** 1875 * Cancels and clears all touch targets. 1876 */ 1877 private void cancelAndClearTouchTargets(MotionEvent event) { 1878 if (mFirstTouchTarget != null) { 1879 boolean syntheticEvent = false; 1880 if (event == null) { 1881 final long now = SystemClock.uptimeMillis(); 1882 event = MotionEvent.obtain(now, now, 1883 MotionEvent.ACTION_CANCEL, 0.0f, 0.0f, 0); 1884 event.setSource(InputDevice.SOURCE_TOUCHSCREEN); 1885 syntheticEvent = true; 1886 } 1887 1888 for (TouchTarget target = mFirstTouchTarget; target != null; target = target.next) { 1889 resetCancelNextUpFlag(target.child); 1890 dispatchTransformedTouchEvent(event, true, target.child, target.pointerIdBits); 1891 } 1892 clearTouchTargets(); 1893 1894 if (syntheticEvent) { 1895 event.recycle(); 1896 } 1897 } 1898 } 1899 1900 /** 1901 * Gets the touch target for specified child view. 1902 * Returns null if not found. 1903 */ 1904 private TouchTarget getTouchTarget(View child) { 1905 for (TouchTarget target = mFirstTouchTarget; target != null; target = target.next) { 1906 if (target.child == child) { 1907 return target; 1908 } 1909 } 1910 return null; 1911 } 1912 1913 /** 1914 * Adds a touch target for specified child to the beginning of the list. 1915 * Assumes the target child is not already present. 1916 */ 1917 private TouchTarget addTouchTarget(View child, int pointerIdBits) { 1918 TouchTarget target = TouchTarget.obtain(child, pointerIdBits); 1919 target.next = mFirstTouchTarget; 1920 mFirstTouchTarget = target; 1921 return target; 1922 } 1923 1924 /** 1925 * Removes the pointer ids from consideration. 1926 */ 1927 private void removePointersFromTouchTargets(int pointerIdBits) { 1928 TouchTarget predecessor = null; 1929 TouchTarget target = mFirstTouchTarget; 1930 while (target != null) { 1931 final TouchTarget next = target.next; 1932 if ((target.pointerIdBits & pointerIdBits) != 0) { 1933 target.pointerIdBits &= ~pointerIdBits; 1934 if (target.pointerIdBits == 0) { 1935 if (predecessor == null) { 1936 mFirstTouchTarget = next; 1937 } else { 1938 predecessor.next = next; 1939 } 1940 target.recycle(); 1941 target = next; 1942 continue; 1943 } 1944 } 1945 predecessor = target; 1946 target = next; 1947 } 1948 } 1949 1950 /** 1951 * Returns true if a child view can receive pointer events. 1952 * @hide 1953 */ 1954 private static boolean canViewReceivePointerEvents(View child) { 1955 return (child.mViewFlags & VISIBILITY_MASK) == VISIBLE 1956 || child.getAnimation() != null; 1957 } 1958 1959 /** 1960 * Returns true if a child view contains the specified point when transformed 1961 * into its coordinate space. 1962 * Child must not be null. 1963 * @hide 1964 */ 1965 protected boolean isTransformedTouchPointInView(float x, float y, View child, 1966 PointF outLocalPoint) { 1967 float localX = x + mScrollX - child.mLeft; 1968 float localY = y + mScrollY - child.mTop; 1969 if (! child.hasIdentityMatrix() && mAttachInfo != null) { 1970 final float[] localXY = mAttachInfo.mTmpTransformLocation; 1971 localXY[0] = localX; 1972 localXY[1] = localY; 1973 child.getInverseMatrix().mapPoints(localXY); 1974 localX = localXY[0]; 1975 localY = localXY[1]; 1976 } 1977 final boolean isInView = child.pointInView(localX, localY); 1978 if (isInView && outLocalPoint != null) { 1979 outLocalPoint.set(localX, localY); 1980 } 1981 return isInView; 1982 } 1983 1984 /** 1985 * Transforms a motion event into the coordinate space of a particular child view, 1986 * filters out irrelevant pointer ids, and overrides its action if necessary. 1987 * If child is null, assumes the MotionEvent will be sent to this ViewGroup instead. 1988 */ 1989 private boolean dispatchTransformedTouchEvent(MotionEvent event, boolean cancel, 1990 View child, int desiredPointerIdBits) { 1991 final boolean handled; 1992 1993 // Canceling motions is a special case. We don't need to perform any transformations 1994 // or filtering. The important part is the action, not the contents. 1995 final int oldAction = event.getAction(); 1996 if (cancel || oldAction == MotionEvent.ACTION_CANCEL) { 1997 event.setAction(MotionEvent.ACTION_CANCEL); 1998 if (child == null) { 1999 handled = super.dispatchTouchEvent(event); 2000 } else { 2001 handled = child.dispatchTouchEvent(event); 2002 } 2003 event.setAction(oldAction); 2004 return handled; 2005 } 2006 2007 // Calculate the number of pointers to deliver. 2008 final int oldPointerIdBits = event.getPointerIdBits(); 2009 final int newPointerIdBits = oldPointerIdBits & desiredPointerIdBits; 2010 2011 // If for some reason we ended up in an inconsistent state where it looks like we 2012 // might produce a motion event with no pointers in it, then drop the event. 2013 if (newPointerIdBits == 0) { 2014 return false; 2015 } 2016 2017 // If the number of pointers is the same and we don't need to perform any fancy 2018 // irreversible transformations, then we can reuse the motion event for this 2019 // dispatch as long as we are careful to revert any changes we make. 2020 // Otherwise we need to make a copy. 2021 final MotionEvent transformedEvent; 2022 if (newPointerIdBits == oldPointerIdBits) { 2023 if (child == null || child.hasIdentityMatrix()) { 2024 if (child == null) { 2025 handled = super.dispatchTouchEvent(event); 2026 } else { 2027 final float offsetX = mScrollX - child.mLeft; 2028 final float offsetY = mScrollY - child.mTop; 2029 event.offsetLocation(offsetX, offsetY); 2030 2031 handled = child.dispatchTouchEvent(event); 2032 2033 event.offsetLocation(-offsetX, -offsetY); 2034 } 2035 return handled; 2036 } 2037 transformedEvent = MotionEvent.obtain(event); 2038 } else { 2039 transformedEvent = event.split(newPointerIdBits); 2040 } 2041 2042 // Perform any necessary transformations and dispatch. 2043 if (child == null) { 2044 handled = super.dispatchTouchEvent(transformedEvent); 2045 } else { 2046 final float offsetX = mScrollX - child.mLeft; 2047 final float offsetY = mScrollY - child.mTop; 2048 transformedEvent.offsetLocation(offsetX, offsetY); 2049 if (! child.hasIdentityMatrix()) { 2050 transformedEvent.transform(child.getInverseMatrix()); 2051 } 2052 2053 handled = child.dispatchTouchEvent(transformedEvent); 2054 } 2055 2056 // Done. 2057 transformedEvent.recycle(); 2058 return handled; 2059 } 2060 2061 /** 2062 * Enable or disable the splitting of MotionEvents to multiple children during touch event 2063 * dispatch. This behavior is enabled by default for applications that target an 2064 * SDK version of {@link Build.VERSION_CODES#HONEYCOMB} or newer. 2065 * 2066 * <p>When this option is enabled MotionEvents may be split and dispatched to different child 2067 * views depending on where each pointer initially went down. This allows for user interactions 2068 * such as scrolling two panes of content independently, chording of buttons, and performing 2069 * independent gestures on different pieces of content. 2070 * 2071 * @param split <code>true</code> to allow MotionEvents to be split and dispatched to multiple 2072 * child views. <code>false</code> to only allow one child view to be the target of 2073 * any MotionEvent received by this ViewGroup. 2074 */ 2075 public void setMotionEventSplittingEnabled(boolean split) { 2076 // TODO Applications really shouldn't change this setting mid-touch event, 2077 // but perhaps this should handle that case and send ACTION_CANCELs to any child views 2078 // with gestures in progress when this is changed. 2079 if (split) { 2080 mGroupFlags |= FLAG_SPLIT_MOTION_EVENTS; 2081 } else { 2082 mGroupFlags &= ~FLAG_SPLIT_MOTION_EVENTS; 2083 } 2084 } 2085 2086 /** 2087 * Returns true if MotionEvents dispatched to this ViewGroup can be split to multiple children. 2088 * @return true if MotionEvents dispatched to this ViewGroup can be split to multiple children. 2089 */ 2090 public boolean isMotionEventSplittingEnabled() { 2091 return (mGroupFlags & FLAG_SPLIT_MOTION_EVENTS) == FLAG_SPLIT_MOTION_EVENTS; 2092 } 2093 2094 /** 2095 * {@inheritDoc} 2096 */ 2097 public void requestDisallowInterceptTouchEvent(boolean disallowIntercept) { 2098 2099 if (disallowIntercept == ((mGroupFlags & FLAG_DISALLOW_INTERCEPT) != 0)) { 2100 // We're already in this state, assume our ancestors are too 2101 return; 2102 } 2103 2104 if (disallowIntercept) { 2105 mGroupFlags |= FLAG_DISALLOW_INTERCEPT; 2106 } else { 2107 mGroupFlags &= ~FLAG_DISALLOW_INTERCEPT; 2108 } 2109 2110 // Pass it up to our parent 2111 if (mParent != null) { 2112 mParent.requestDisallowInterceptTouchEvent(disallowIntercept); 2113 } 2114 } 2115 2116 /** 2117 * Implement this method to intercept all touch screen motion events. This 2118 * allows you to watch events as they are dispatched to your children, and 2119 * take ownership of the current gesture at any point. 2120 * 2121 * <p>Using this function takes some care, as it has a fairly complicated 2122 * interaction with {@link View#onTouchEvent(MotionEvent) 2123 * View.onTouchEvent(MotionEvent)}, and using it requires implementing 2124 * that method as well as this one in the correct way. Events will be 2125 * received in the following order: 2126 * 2127 * <ol> 2128 * <li> You will receive the down event here. 2129 * <li> The down event will be handled either by a child of this view 2130 * group, or given to your own onTouchEvent() method to handle; this means 2131 * you should implement onTouchEvent() to return true, so you will 2132 * continue to see the rest of the gesture (instead of looking for 2133 * a parent view to handle it). Also, by returning true from 2134 * onTouchEvent(), you will not receive any following 2135 * events in onInterceptTouchEvent() and all touch processing must 2136 * happen in onTouchEvent() like normal. 2137 * <li> For as long as you return false from this function, each following 2138 * event (up to and including the final up) will be delivered first here 2139 * and then to the target's onTouchEvent(). 2140 * <li> If you return true from here, you will not receive any 2141 * following events: the target view will receive the same event but 2142 * with the action {@link MotionEvent#ACTION_CANCEL}, and all further 2143 * events will be delivered to your onTouchEvent() method and no longer 2144 * appear here. 2145 * </ol> 2146 * 2147 * @param ev The motion event being dispatched down the hierarchy. 2148 * @return Return true to steal motion events from the children and have 2149 * them dispatched to this ViewGroup through onTouchEvent(). 2150 * The current target will receive an ACTION_CANCEL event, and no further 2151 * messages will be delivered here. 2152 */ 2153 public boolean onInterceptTouchEvent(MotionEvent ev) { 2154 return false; 2155 } 2156 2157 /** 2158 * {@inheritDoc} 2159 * 2160 * Looks for a view to give focus to respecting the setting specified by 2161 * {@link #getDescendantFocusability()}. 2162 * 2163 * Uses {@link #onRequestFocusInDescendants(int, android.graphics.Rect)} to 2164 * find focus within the children of this group when appropriate. 2165 * 2166 * @see #FOCUS_BEFORE_DESCENDANTS 2167 * @see #FOCUS_AFTER_DESCENDANTS 2168 * @see #FOCUS_BLOCK_DESCENDANTS 2169 * @see #onRequestFocusInDescendants(int, android.graphics.Rect) 2170 */ 2171 @Override 2172 public boolean requestFocus(int direction, Rect previouslyFocusedRect) { 2173 if (DBG) { 2174 System.out.println(this + " ViewGroup.requestFocus direction=" 2175 + direction); 2176 } 2177 int descendantFocusability = getDescendantFocusability(); 2178 2179 switch (descendantFocusability) { 2180 case FOCUS_BLOCK_DESCENDANTS: 2181 return super.requestFocus(direction, previouslyFocusedRect); 2182 case FOCUS_BEFORE_DESCENDANTS: { 2183 final boolean took = super.requestFocus(direction, previouslyFocusedRect); 2184 return took ? took : onRequestFocusInDescendants(direction, previouslyFocusedRect); 2185 } 2186 case FOCUS_AFTER_DESCENDANTS: { 2187 final boolean took = onRequestFocusInDescendants(direction, previouslyFocusedRect); 2188 return took ? took : super.requestFocus(direction, previouslyFocusedRect); 2189 } 2190 default: 2191 throw new IllegalStateException("descendant focusability must be " 2192 + "one of FOCUS_BEFORE_DESCENDANTS, FOCUS_AFTER_DESCENDANTS, FOCUS_BLOCK_DESCENDANTS " 2193 + "but is " + descendantFocusability); 2194 } 2195 } 2196 2197 /** 2198 * Look for a descendant to call {@link View#requestFocus} on. 2199 * Called by {@link ViewGroup#requestFocus(int, android.graphics.Rect)} 2200 * when it wants to request focus within its children. Override this to 2201 * customize how your {@link ViewGroup} requests focus within its children. 2202 * @param direction One of FOCUS_UP, FOCUS_DOWN, FOCUS_LEFT, and FOCUS_RIGHT 2203 * @param previouslyFocusedRect The rectangle (in this View's coordinate system) 2204 * to give a finer grained hint about where focus is coming from. May be null 2205 * if there is no hint. 2206 * @return Whether focus was taken. 2207 */ 2208 @SuppressWarnings({"ConstantConditions"}) 2209 protected boolean onRequestFocusInDescendants(int direction, 2210 Rect previouslyFocusedRect) { 2211 int index; 2212 int increment; 2213 int end; 2214 int count = mChildrenCount; 2215 if ((direction & FOCUS_FORWARD) != 0) { 2216 index = 0; 2217 increment = 1; 2218 end = count; 2219 } else { 2220 index = count - 1; 2221 increment = -1; 2222 end = -1; 2223 } 2224 final View[] children = mChildren; 2225 for (int i = index; i != end; i += increment) { 2226 View child = children[i]; 2227 if ((child.mViewFlags & VISIBILITY_MASK) == VISIBLE) { 2228 if (child.requestFocus(direction, previouslyFocusedRect)) { 2229 return true; 2230 } 2231 } 2232 } 2233 return false; 2234 } 2235 2236 /** 2237 * {@inheritDoc} 2238 * 2239 * @hide 2240 */ 2241 @Override 2242 public void dispatchStartTemporaryDetach() { 2243 super.dispatchStartTemporaryDetach(); 2244 final int count = mChildrenCount; 2245 final View[] children = mChildren; 2246 for (int i = 0; i < count; i++) { 2247 children[i].dispatchStartTemporaryDetach(); 2248 } 2249 } 2250 2251 /** 2252 * {@inheritDoc} 2253 * 2254 * @hide 2255 */ 2256 @Override 2257 public void dispatchFinishTemporaryDetach() { 2258 super.dispatchFinishTemporaryDetach(); 2259 final int count = mChildrenCount; 2260 final View[] children = mChildren; 2261 for (int i = 0; i < count; i++) { 2262 children[i].dispatchFinishTemporaryDetach(); 2263 } 2264 } 2265 2266 /** 2267 * {@inheritDoc} 2268 */ 2269 @Override 2270 void dispatchAttachedToWindow(AttachInfo info, int visibility) { 2271 mGroupFlags |= FLAG_PREVENT_DISPATCH_ATTACHED_TO_WINDOW; 2272 super.dispatchAttachedToWindow(info, visibility); 2273 mGroupFlags &= ~FLAG_PREVENT_DISPATCH_ATTACHED_TO_WINDOW; 2274 2275 final int count = mChildrenCount; 2276 final View[] children = mChildren; 2277 for (int i = 0; i < count; i++) { 2278 final View child = children[i]; 2279 child.dispatchAttachedToWindow(info, 2280 visibility | (child.mViewFlags&VISIBILITY_MASK)); 2281 } 2282 } 2283 2284 @Override 2285 void dispatchScreenStateChanged(int screenState) { 2286 super.dispatchScreenStateChanged(screenState); 2287 2288 final int count = mChildrenCount; 2289 final View[] children = mChildren; 2290 for (int i = 0; i < count; i++) { 2291 children[i].dispatchScreenStateChanged(screenState); 2292 } 2293 } 2294 2295 @Override 2296 boolean dispatchPopulateAccessibilityEventInternal(AccessibilityEvent event) { 2297 boolean handled = super.dispatchPopulateAccessibilityEventInternal(event); 2298 if (handled) { 2299 return handled; 2300 } 2301 // Let our children have a shot in populating the event. 2302 for (int i = 0, count = getChildCount(); i < count; i++) { 2303 View child = getChildAt(i); 2304 if ((child.mViewFlags & VISIBILITY_MASK) == VISIBLE) { 2305 handled = getChildAt(i).dispatchPopulateAccessibilityEvent(event); 2306 if (handled) { 2307 return handled; 2308 } 2309 } 2310 } 2311 return false; 2312 } 2313 2314 @Override 2315 void onInitializeAccessibilityNodeInfoInternal(AccessibilityNodeInfo info) { 2316 super.onInitializeAccessibilityNodeInfoInternal(info); 2317 info.setClassName(ViewGroup.class.getName()); 2318 for (int i = 0, count = mChildrenCount; i < count; i++) { 2319 View child = mChildren[i]; 2320 if ((child.mViewFlags & VISIBILITY_MASK) == VISIBLE 2321 && (child.mPrivateFlags & IS_ROOT_NAMESPACE) == 0) { 2322 info.addChild(child); 2323 } 2324 } 2325 } 2326 2327 @Override 2328 void onInitializeAccessibilityEventInternal(AccessibilityEvent event) { 2329 super.onInitializeAccessibilityEventInternal(event); 2330 event.setClassName(ViewGroup.class.getName()); 2331 } 2332 2333 /** 2334 * {@inheritDoc} 2335 */ 2336 @Override 2337 void dispatchDetachedFromWindow() { 2338 // If we still have a touch target, we are still in the process of 2339 // dispatching motion events to a child; we need to get rid of that 2340 // child to avoid dispatching events to it after the window is torn 2341 // down. To make sure we keep the child in a consistent state, we 2342 // first send it an ACTION_CANCEL motion event. 2343 cancelAndClearTouchTargets(null); 2344 2345 // In case view is detached while transition is running 2346 mLayoutSuppressed = false; 2347 2348 // Tear down our drag tracking 2349 mDragNotifiedChildren = null; 2350 if (mCurrentDrag != null) { 2351 mCurrentDrag.recycle(); 2352 mCurrentDrag = null; 2353 } 2354 2355 final int count = mChildrenCount; 2356 final View[] children = mChildren; 2357 for (int i = 0; i < count; i++) { 2358 children[i].dispatchDetachedFromWindow(); 2359 } 2360 super.dispatchDetachedFromWindow(); 2361 } 2362 2363 /** 2364 * {@inheritDoc} 2365 */ 2366 @Override 2367 public void setPadding(int left, int top, int right, int bottom) { 2368 super.setPadding(left, top, right, bottom); 2369 2370 if ((mPaddingLeft | mPaddingTop | mPaddingRight | mPaddingBottom) != 0) { 2371 mGroupFlags |= FLAG_PADDING_NOT_NULL; 2372 } else { 2373 mGroupFlags &= ~FLAG_PADDING_NOT_NULL; 2374 } 2375 } 2376 2377 /** 2378 * {@inheritDoc} 2379 */ 2380 @Override 2381 protected void dispatchSaveInstanceState(SparseArray<Parcelable> container) { 2382 super.dispatchSaveInstanceState(container); 2383 final int count = mChildrenCount; 2384 final View[] children = mChildren; 2385 for (int i = 0; i < count; i++) { 2386 View c = children[i]; 2387 if ((c.mViewFlags & PARENT_SAVE_DISABLED_MASK) != PARENT_SAVE_DISABLED) { 2388 c.dispatchSaveInstanceState(container); 2389 } 2390 } 2391 } 2392 2393 /** 2394 * Perform dispatching of a {@link #saveHierarchyState(android.util.SparseArray)} freeze()} 2395 * to only this view, not to its children. For use when overriding 2396 * {@link #dispatchSaveInstanceState(android.util.SparseArray)} dispatchFreeze()} to allow 2397 * subclasses to freeze their own state but not the state of their children. 2398 * 2399 * @param container the container 2400 */ 2401 protected void dispatchFreezeSelfOnly(SparseArray<Parcelable> container) { 2402 super.dispatchSaveInstanceState(container); 2403 } 2404 2405 /** 2406 * {@inheritDoc} 2407 */ 2408 @Override 2409 protected void dispatchRestoreInstanceState(SparseArray<Parcelable> container) { 2410 super.dispatchRestoreInstanceState(container); 2411 final int count = mChildrenCount; 2412 final View[] children = mChildren; 2413 for (int i = 0; i < count; i++) { 2414 View c = children[i]; 2415 if ((c.mViewFlags & PARENT_SAVE_DISABLED_MASK) != PARENT_SAVE_DISABLED) { 2416 c.dispatchRestoreInstanceState(container); 2417 } 2418 } 2419 } 2420 2421 /** 2422 * Perform dispatching of a {@link #restoreHierarchyState(android.util.SparseArray)} 2423 * to only this view, not to its children. For use when overriding 2424 * {@link #dispatchRestoreInstanceState(android.util.SparseArray)} to allow 2425 * subclasses to thaw their own state but not the state of their children. 2426 * 2427 * @param container the container 2428 */ 2429 protected void dispatchThawSelfOnly(SparseArray<Parcelable> container) { 2430 super.dispatchRestoreInstanceState(container); 2431 } 2432 2433 /** 2434 * Enables or disables the drawing cache for each child of this view group. 2435 * 2436 * @param enabled true to enable the cache, false to dispose of it 2437 */ 2438 protected void setChildrenDrawingCacheEnabled(boolean enabled) { 2439 if (enabled || (mPersistentDrawingCache & PERSISTENT_ALL_CACHES) != PERSISTENT_ALL_CACHES) { 2440 final View[] children = mChildren; 2441 final int count = mChildrenCount; 2442 for (int i = 0; i < count; i++) { 2443 children[i].setDrawingCacheEnabled(enabled); 2444 } 2445 } 2446 } 2447 2448 @Override 2449 protected void onAnimationStart() { 2450 super.onAnimationStart(); 2451 2452 // When this ViewGroup's animation starts, build the cache for the children 2453 if ((mGroupFlags & FLAG_ANIMATION_CACHE) == FLAG_ANIMATION_CACHE) { 2454 final int count = mChildrenCount; 2455 final View[] children = mChildren; 2456 final boolean buildCache = !isHardwareAccelerated(); 2457 2458 for (int i = 0; i < count; i++) { 2459 final View child = children[i]; 2460 if ((child.mViewFlags & VISIBILITY_MASK) == VISIBLE) { 2461 child.setDrawingCacheEnabled(true); 2462 if (buildCache) { 2463 child.buildDrawingCache(true); 2464 } 2465 } 2466 } 2467 2468 mGroupFlags |= FLAG_CHILDREN_DRAWN_WITH_CACHE; 2469 } 2470 } 2471 2472 @Override 2473 protected void onAnimationEnd() { 2474 super.onAnimationEnd(); 2475 2476 // When this ViewGroup's animation ends, destroy the cache of the children 2477 if ((mGroupFlags & FLAG_ANIMATION_CACHE) == FLAG_ANIMATION_CACHE) { 2478 mGroupFlags &= ~FLAG_CHILDREN_DRAWN_WITH_CACHE; 2479 2480 if ((mPersistentDrawingCache & PERSISTENT_ANIMATION_CACHE) == 0) { 2481 setChildrenDrawingCacheEnabled(false); 2482 } 2483 } 2484 } 2485 2486 @Override 2487 Bitmap createSnapshot(Bitmap.Config quality, int backgroundColor, boolean skipChildren) { 2488 int count = mChildrenCount; 2489 int[] visibilities = null; 2490 2491 if (skipChildren) { 2492 visibilities = new int[count]; 2493 for (int i = 0; i < count; i++) { 2494 View child = getChildAt(i); 2495 visibilities[i] = child.getVisibility(); 2496 if (visibilities[i] == View.VISIBLE) { 2497 child.setVisibility(INVISIBLE); 2498 } 2499 } 2500 } 2501 2502 Bitmap b = super.createSnapshot(quality, backgroundColor, skipChildren); 2503 2504 if (skipChildren) { 2505 for (int i = 0; i < count; i++) { 2506 getChildAt(i).setVisibility(visibilities[i]); 2507 } 2508 } 2509 2510 return b; 2511 } 2512 2513 /** 2514 * {@inheritDoc} 2515 */ 2516 @Override 2517 protected void dispatchDraw(Canvas canvas) { 2518 final int count = mChildrenCount; 2519 final View[] children = mChildren; 2520 int flags = mGroupFlags; 2521 2522 if ((flags & FLAG_RUN_ANIMATION) != 0 && canAnimate()) { 2523 final boolean cache = (mGroupFlags & FLAG_ANIMATION_CACHE) == FLAG_ANIMATION_CACHE; 2524 2525 final boolean buildCache = !isHardwareAccelerated(); 2526 for (int i = 0; i < count; i++) { 2527 final View child = children[i]; 2528 if ((child.mViewFlags & VISIBILITY_MASK) == VISIBLE) { 2529 final LayoutParams params = child.getLayoutParams(); 2530 attachLayoutAnimationParameters(child, params, i, count); 2531 bindLayoutAnimation(child); 2532 if (cache) { 2533 child.setDrawingCacheEnabled(true); 2534 if (buildCache) { 2535 child.buildDrawingCache(true); 2536 } 2537 } 2538 } 2539 } 2540 2541 final LayoutAnimationController controller = mLayoutAnimationController; 2542 if (controller.willOverlap()) { 2543 mGroupFlags |= FLAG_OPTIMIZE_INVALIDATE; 2544 } 2545 2546 controller.start(); 2547 2548 mGroupFlags &= ~FLAG_RUN_ANIMATION; 2549 mGroupFlags &= ~FLAG_ANIMATION_DONE; 2550 2551 if (cache) { 2552 mGroupFlags |= FLAG_CHILDREN_DRAWN_WITH_CACHE; 2553 } 2554 2555 if (mAnimationListener != null) { 2556 mAnimationListener.onAnimationStart(controller.getAnimation()); 2557 } 2558 } 2559 2560 int saveCount = 0; 2561 final boolean clipToPadding = (flags & CLIP_TO_PADDING_MASK) == CLIP_TO_PADDING_MASK; 2562 if (clipToPadding) { 2563 saveCount = canvas.save(); 2564 canvas.clipRect(mScrollX + mPaddingLeft, mScrollY + mPaddingTop, 2565 mScrollX + mRight - mLeft - mPaddingRight, 2566 mScrollY + mBottom - mTop - mPaddingBottom); 2567 2568 } 2569 2570 // We will draw our child's animation, let's reset the flag 2571 mPrivateFlags &= ~DRAW_ANIMATION; 2572 mGroupFlags &= ~FLAG_INVALIDATE_REQUIRED; 2573 2574 boolean more = false; 2575 final long drawingTime = getDrawingTime(); 2576 2577 if ((flags & FLAG_USE_CHILD_DRAWING_ORDER) == 0) { 2578 for (int i = 0; i < count; i++) { 2579 final View child = children[i]; 2580 if ((child.mViewFlags & VISIBILITY_MASK) == VISIBLE || child.getAnimation() != null) { 2581 more |= drawChild(canvas, child, drawingTime); 2582 } 2583 } 2584 } else { 2585 for (int i = 0; i < count; i++) { 2586 final View child = children[getChildDrawingOrder(count, i)]; 2587 if ((child.mViewFlags & VISIBILITY_MASK) == VISIBLE || child.getAnimation() != null) { 2588 more |= drawChild(canvas, child, drawingTime); 2589 } 2590 } 2591 } 2592 2593 // Draw any disappearing views that have animations 2594 if (mDisappearingChildren != null) { 2595 final ArrayList<View> disappearingChildren = mDisappearingChildren; 2596 final int disappearingCount = disappearingChildren.size() - 1; 2597 // Go backwards -- we may delete as animations finish 2598 for (int i = disappearingCount; i >= 0; i--) { 2599 final View child = disappearingChildren.get(i); 2600 more |= drawChild(canvas, child, drawingTime); 2601 } 2602 } 2603 2604 if (clipToPadding) { 2605 canvas.restoreToCount(saveCount); 2606 } 2607 2608 // mGroupFlags might have been updated by drawChild() 2609 flags = mGroupFlags; 2610 2611 if ((flags & FLAG_INVALIDATE_REQUIRED) == FLAG_INVALIDATE_REQUIRED) { 2612 invalidate(true); 2613 } 2614 2615 if ((flags & FLAG_ANIMATION_DONE) == 0 && (flags & FLAG_NOTIFY_ANIMATION_LISTENER) == 0 && 2616 mLayoutAnimationController.isDone() && !more) { 2617 // We want to erase the drawing cache and notify the listener after the 2618 // next frame is drawn because one extra invalidate() is caused by 2619 // drawChild() after the animation is over 2620 mGroupFlags |= FLAG_NOTIFY_ANIMATION_LISTENER; 2621 final Runnable end = new Runnable() { 2622 public void run() { 2623 notifyAnimationListener(); 2624 } 2625 }; 2626 post(end); 2627 } 2628 } 2629 2630 /** 2631 * Returns the index of the child to draw for this iteration. Override this 2632 * if you want to change the drawing order of children. By default, it 2633 * returns i. 2634 * <p> 2635 * NOTE: In order for this method to be called, you must enable child ordering 2636 * first by calling {@link #setChildrenDrawingOrderEnabled(boolean)}. 2637 * 2638 * @param i The current iteration. 2639 * @return The index of the child to draw this iteration. 2640 * 2641 * @see #setChildrenDrawingOrderEnabled(boolean) 2642 * @see #isChildrenDrawingOrderEnabled() 2643 */ 2644 protected int getChildDrawingOrder(int childCount, int i) { 2645 return i; 2646 } 2647 2648 private void notifyAnimationListener() { 2649 mGroupFlags &= ~FLAG_NOTIFY_ANIMATION_LISTENER; 2650 mGroupFlags |= FLAG_ANIMATION_DONE; 2651 2652 if (mAnimationListener != null) { 2653 final Runnable end = new Runnable() { 2654 public void run() { 2655 mAnimationListener.onAnimationEnd(mLayoutAnimationController.getAnimation()); 2656 } 2657 }; 2658 post(end); 2659 } 2660 2661 if ((mGroupFlags & FLAG_ANIMATION_CACHE) == FLAG_ANIMATION_CACHE) { 2662 mGroupFlags &= ~FLAG_CHILDREN_DRAWN_WITH_CACHE; 2663 if ((mPersistentDrawingCache & PERSISTENT_ANIMATION_CACHE) == 0) { 2664 setChildrenDrawingCacheEnabled(false); 2665 } 2666 } 2667 2668 invalidate(true); 2669 } 2670 2671 /** 2672 * This method is used to cause children of this ViewGroup to restore or recreate their 2673 * display lists. It is called by getDisplayList() when the parent ViewGroup does not need 2674 * to recreate its own display list, which would happen if it went through the normal 2675 * draw/dispatchDraw mechanisms. 2676 * 2677 * @hide 2678 */ 2679 @Override 2680 protected void dispatchGetDisplayList() { 2681 final int count = mChildrenCount; 2682 final View[] children = mChildren; 2683 for (int i = 0; i < count; i++) { 2684 final View child = children[i]; 2685 if (((child.mViewFlags & VISIBILITY_MASK) == VISIBLE || child.getAnimation() != null) && 2686 child.hasStaticLayer()) { 2687 child.mRecreateDisplayList = (child.mPrivateFlags & INVALIDATED) == INVALIDATED; 2688 child.mPrivateFlags &= ~INVALIDATED; 2689 child.getDisplayList(); 2690 child.mRecreateDisplayList = false; 2691 } 2692 } 2693 } 2694 2695 /** 2696 * Draw one child of this View Group. This method is responsible for getting 2697 * the canvas in the right state. This includes clipping, translating so 2698 * that the child's scrolled origin is at 0, 0, and applying any animation 2699 * transformations. 2700 * 2701 * @param canvas The canvas on which to draw the child 2702 * @param child Who to draw 2703 * @param drawingTime The time at which draw is occurring 2704 * @return True if an invalidate() was issued 2705 */ 2706 protected boolean drawChild(Canvas canvas, View child, long drawingTime) { 2707 return child.draw(canvas, this, drawingTime); 2708 } 2709 2710 /** 2711 * 2712 * @param enabled True if children should be drawn with layers, false otherwise. 2713 * 2714 * @hide 2715 */ 2716 public void setChildrenLayersEnabled(boolean enabled) { 2717 if (enabled != mDrawLayers) { 2718 mDrawLayers = enabled; 2719 invalidate(true); 2720 2721 boolean flushLayers = !enabled; 2722 AttachInfo info = mAttachInfo; 2723 if (info != null && info.mHardwareRenderer != null && 2724 info.mHardwareRenderer.isEnabled()) { 2725 if (!info.mHardwareRenderer.validate()) { 2726 flushLayers = false; 2727 } 2728 } else { 2729 flushLayers = false; 2730 } 2731 2732 // We need to invalidate any child with a layer. For instance, 2733 // if a child is backed by a hardware layer and we disable layers 2734 // the child is marked as not dirty (flags cleared the last time 2735 // the child was drawn inside its layer.) However, that child might 2736 // never have created its own display list or have an obsolete 2737 // display list. By invalidating the child we ensure the display 2738 // list is in sync with the content of the hardware layer. 2739 for (int i = 0; i < mChildrenCount; i++) { 2740 View child = mChildren[i]; 2741 if (child.mLayerType != LAYER_TYPE_NONE) { 2742 if (flushLayers) child.flushLayer(); 2743 child.invalidate(true); 2744 } 2745 } 2746 } 2747 } 2748 2749 /** 2750 * By default, children are clipped to their bounds before drawing. This 2751 * allows view groups to override this behavior for animations, etc. 2752 * 2753 * @param clipChildren true to clip children to their bounds, 2754 * false otherwise 2755 * @attr ref android.R.styleable#ViewGroup_clipChildren 2756 */ 2757 public void setClipChildren(boolean clipChildren) { 2758 boolean previousValue = (mGroupFlags & FLAG_CLIP_CHILDREN) == FLAG_CLIP_CHILDREN; 2759 if (clipChildren != previousValue) { 2760 setBooleanFlag(FLAG_CLIP_CHILDREN, clipChildren); 2761 if (USE_DISPLAY_LIST_PROPERTIES) { 2762 for (int i = 0; i < mChildrenCount; ++i) { 2763 View child = getChildAt(i); 2764 if (child.mDisplayList != null) { 2765 child.mDisplayList.setClipChildren(clipChildren); 2766 } 2767 } 2768 } 2769 } 2770 } 2771 2772 /** 2773 * By default, children are clipped to the padding of the ViewGroup. This 2774 * allows view groups to override this behavior 2775 * 2776 * @param clipToPadding true to clip children to the padding of the 2777 * group, false otherwise 2778 * @attr ref android.R.styleable#ViewGroup_clipToPadding 2779 */ 2780 public void setClipToPadding(boolean clipToPadding) { 2781 setBooleanFlag(FLAG_CLIP_TO_PADDING, clipToPadding); 2782 } 2783 2784 /** 2785 * {@inheritDoc} 2786 */ 2787 @Override 2788 public void dispatchSetSelected(boolean selected) { 2789 final View[] children = mChildren; 2790 final int count = mChildrenCount; 2791 for (int i = 0; i < count; i++) { 2792 children[i].setSelected(selected); 2793 } 2794 } 2795 2796 /** 2797 * {@inheritDoc} 2798 */ 2799 @Override 2800 public void dispatchSetActivated(boolean activated) { 2801 final View[] children = mChildren; 2802 final int count = mChildrenCount; 2803 for (int i = 0; i < count; i++) { 2804 children[i].setActivated(activated); 2805 } 2806 } 2807 2808 @Override 2809 protected void dispatchSetPressed(boolean pressed) { 2810 final View[] children = mChildren; 2811 final int count = mChildrenCount; 2812 for (int i = 0; i < count; i++) { 2813 final View child = children[i]; 2814 // Children that are clickable on their own should not 2815 // show a pressed state when their parent view does. 2816 // Clearing a pressed state always propagates. 2817 if (!pressed || (!child.isClickable() && !child.isLongClickable())) { 2818 child.setPressed(pressed); 2819 } 2820 } 2821 } 2822 2823 /** 2824 * When this property is set to true, this ViewGroup supports static transformations on 2825 * children; this causes 2826 * {@link #getChildStaticTransformation(View, android.view.animation.Transformation)} to be 2827 * invoked when a child is drawn. 2828 * 2829 * Any subclass overriding 2830 * {@link #getChildStaticTransformation(View, android.view.animation.Transformation)} should 2831 * set this property to true. 2832 * 2833 * @param enabled True to enable static transformations on children, false otherwise. 2834 * 2835 * @see #FLAG_SUPPORT_STATIC_TRANSFORMATIONS 2836 */ 2837 protected void setStaticTransformationsEnabled(boolean enabled) { 2838 setBooleanFlag(FLAG_SUPPORT_STATIC_TRANSFORMATIONS, enabled); 2839 } 2840 2841 /** 2842 * Sets <code>t</code> to be the static transformation of the child, if set, returning a 2843 * boolean to indicate whether a static transform was set. The default implementation 2844 * simply returns <code>false</code>; subclasses may override this method for different 2845 * behavior. 2846 * 2847 * @param child The child view whose static transform is being requested 2848 * @param t The Transformation which will hold the result 2849 * @return true if the transformation was set, false otherwise 2850 * @see #setStaticTransformationsEnabled(boolean) 2851 */ 2852 protected boolean getChildStaticTransformation(View child, Transformation t) { 2853 return false; 2854 } 2855 2856 /** 2857 * {@hide} 2858 */ 2859 @Override 2860 protected View findViewTraversal(int id) { 2861 if (id == mID) { 2862 return this; 2863 } 2864 2865 final View[] where = mChildren; 2866 final int len = mChildrenCount; 2867 2868 for (int i = 0; i < len; i++) { 2869 View v = where[i]; 2870 2871 if ((v.mPrivateFlags & IS_ROOT_NAMESPACE) == 0) { 2872 v = v.findViewById(id); 2873 2874 if (v != null) { 2875 return v; 2876 } 2877 } 2878 } 2879 2880 return null; 2881 } 2882 2883 /** 2884 * {@hide} 2885 */ 2886 @Override 2887 protected View findViewWithTagTraversal(Object tag) { 2888 if (tag != null && tag.equals(mTag)) { 2889 return this; 2890 } 2891 2892 final View[] where = mChildren; 2893 final int len = mChildrenCount; 2894 2895 for (int i = 0; i < len; i++) { 2896 View v = where[i]; 2897 2898 if ((v.mPrivateFlags & IS_ROOT_NAMESPACE) == 0) { 2899 v = v.findViewWithTag(tag); 2900 2901 if (v != null) { 2902 return v; 2903 } 2904 } 2905 } 2906 2907 return null; 2908 } 2909 2910 /** 2911 * {@hide} 2912 */ 2913 @Override 2914 protected View findViewByPredicateTraversal(Predicate<View> predicate, View childToSkip) { 2915 if (predicate.apply(this)) { 2916 return this; 2917 } 2918 2919 final View[] where = mChildren; 2920 final int len = mChildrenCount; 2921 2922 for (int i = 0; i < len; i++) { 2923 View v = where[i]; 2924 2925 if (v != childToSkip && (v.mPrivateFlags & IS_ROOT_NAMESPACE) == 0) { 2926 v = v.findViewByPredicate(predicate); 2927 2928 if (v != null) { 2929 return v; 2930 } 2931 } 2932 } 2933 2934 return null; 2935 } 2936 2937 /** 2938 * Adds a child view. If no layout parameters are already set on the child, the 2939 * default parameters for this ViewGroup are set on the child. 2940 * 2941 * @param child the child view to add 2942 * 2943 * @see #generateDefaultLayoutParams() 2944 */ 2945 public void addView(View child) { 2946 addView(child, -1); 2947 } 2948 2949 /** 2950 * Adds a child view. If no layout parameters are already set on the child, the 2951 * default parameters for this ViewGroup are set on the child. 2952 * 2953 * @param child the child view to add 2954 * @param index the position at which to add the child 2955 * 2956 * @see #generateDefaultLayoutParams() 2957 */ 2958 public void addView(View child, int index) { 2959 LayoutParams params = child.getLayoutParams(); 2960 if (params == null) { 2961 params = generateDefaultLayoutParams(); 2962 if (params == null) { 2963 throw new IllegalArgumentException("generateDefaultLayoutParams() cannot return null"); 2964 } 2965 } 2966 addView(child, index, params); 2967 } 2968 2969 /** 2970 * Adds a child view with this ViewGroup's default layout parameters and the 2971 * specified width and height. 2972 * 2973 * @param child the child view to add 2974 */ 2975 public void addView(View child, int width, int height) { 2976 final LayoutParams params = generateDefaultLayoutParams(); 2977 params.width = width; 2978 params.height = height; 2979 addView(child, -1, params); 2980 } 2981 2982 /** 2983 * Adds a child view with the specified layout parameters. 2984 * 2985 * @param child the child view to add 2986 * @param params the layout parameters to set on the child 2987 */ 2988 public void addView(View child, LayoutParams params) { 2989 addView(child, -1, params); 2990 } 2991 2992 /** 2993 * Adds a child view with the specified layout parameters. 2994 * 2995 * @param child the child view to add 2996 * @param index the position at which to add the child 2997 * @param params the layout parameters to set on the child 2998 */ 2999 public void addView(View child, int index, LayoutParams params) { 3000 if (DBG) { 3001 System.out.println(this + " addView"); 3002 } 3003 3004 // addViewInner() will call child.requestLayout() when setting the new LayoutParams 3005 // therefore, we call requestLayout() on ourselves before, so that the child's request 3006 // will be blocked at our level 3007 requestLayout(); 3008 invalidate(true); 3009 addViewInner(child, index, params, false); 3010 } 3011 3012 /** 3013 * {@inheritDoc} 3014 */ 3015 public void updateViewLayout(View view, ViewGroup.LayoutParams params) { 3016 if (!checkLayoutParams(params)) { 3017 throw new IllegalArgumentException("Invalid LayoutParams supplied to " + this); 3018 } 3019 if (view.mParent != this) { 3020 throw new IllegalArgumentException("Given view not a child of " + this); 3021 } 3022 view.setLayoutParams(params); 3023 } 3024 3025 /** 3026 * {@inheritDoc} 3027 */ 3028 protected boolean checkLayoutParams(ViewGroup.LayoutParams p) { 3029 return p != null; 3030 } 3031 3032 /** 3033 * Interface definition for a callback to be invoked when the hierarchy 3034 * within this view changed. The hierarchy changes whenever a child is added 3035 * to or removed from this view. 3036 */ 3037 public interface OnHierarchyChangeListener { 3038 /** 3039 * Called when a new child is added to a parent view. 3040 * 3041 * @param parent the view in which a child was added 3042 * @param child the new child view added in the hierarchy 3043 */ 3044 void onChildViewAdded(View parent, View child); 3045 3046 /** 3047 * Called when a child is removed from a parent view. 3048 * 3049 * @param parent the view from which the child was removed 3050 * @param child the child removed from the hierarchy 3051 */ 3052 void onChildViewRemoved(View parent, View child); 3053 } 3054 3055 /** 3056 * Register a callback to be invoked when a child is added to or removed 3057 * from this view. 3058 * 3059 * @param listener the callback to invoke on hierarchy change 3060 */ 3061 public void setOnHierarchyChangeListener(OnHierarchyChangeListener listener) { 3062 mOnHierarchyChangeListener = listener; 3063 } 3064 3065 /** 3066 * @hide 3067 */ 3068 protected void onViewAdded(View child) { 3069 if (mOnHierarchyChangeListener != null) { 3070 mOnHierarchyChangeListener.onChildViewAdded(this, child); 3071 } 3072 } 3073 3074 /** 3075 * @hide 3076 */ 3077 protected void onViewRemoved(View child) { 3078 if (mOnHierarchyChangeListener != null) { 3079 mOnHierarchyChangeListener.onChildViewRemoved(this, child); 3080 } 3081 } 3082 3083 /** 3084 * Adds a view during layout. This is useful if in your onLayout() method, 3085 * you need to add more views (as does the list view for example). 3086 * 3087 * If index is negative, it means put it at the end of the list. 3088 * 3089 * @param child the view to add to the group 3090 * @param index the index at which the child must be added 3091 * @param params the layout parameters to associate with the child 3092 * @return true if the child was added, false otherwise 3093 */ 3094 protected boolean addViewInLayout(View child, int index, LayoutParams params) { 3095 return addViewInLayout(child, index, params, false); 3096 } 3097 3098 /** 3099 * Adds a view during layout. This is useful if in your onLayout() method, 3100 * you need to add more views (as does the list view for example). 3101 * 3102 * If index is negative, it means put it at the end of the list. 3103 * 3104 * @param child the view to add to the group 3105 * @param index the index at which the child must be added 3106 * @param params the layout parameters to associate with the child 3107 * @param preventRequestLayout if true, calling this method will not trigger a 3108 * layout request on child 3109 * @return true if the child was added, false otherwise 3110 */ 3111 protected boolean addViewInLayout(View child, int index, LayoutParams params, 3112 boolean preventRequestLayout) { 3113 child.mParent = null; 3114 addViewInner(child, index, params, preventRequestLayout); 3115 child.mPrivateFlags = (child.mPrivateFlags & ~DIRTY_MASK) | DRAWN; 3116 return true; 3117 } 3118 3119 /** 3120 * Prevents the specified child to be laid out during the next layout pass. 3121 * 3122 * @param child the child on which to perform the cleanup 3123 */ 3124 protected void cleanupLayoutState(View child) { 3125 child.mPrivateFlags &= ~View.FORCE_LAYOUT; 3126 } 3127 3128 private void addViewInner(View child, int index, LayoutParams params, 3129 boolean preventRequestLayout) { 3130 3131 if (mTransition != null) { 3132 // Don't prevent other add transitions from completing, but cancel remove 3133 // transitions to let them complete the process before we add to the container 3134 mTransition.cancel(LayoutTransition.DISAPPEARING); 3135 } 3136 3137 if (child.getParent() != null) { 3138 throw new IllegalStateException("The specified child already has a parent. " + 3139 "You must call removeView() on the child's parent first."); 3140 } 3141 3142 if (mTransition != null) { 3143 mTransition.addChild(this, child); 3144 } 3145 3146 if (!checkLayoutParams(params)) { 3147 params = generateLayoutParams(params); 3148 } 3149 3150 if (preventRequestLayout) { 3151 child.mLayoutParams = params; 3152 } else { 3153 child.setLayoutParams(params); 3154 } 3155 3156 if (index < 0) { 3157 index = mChildrenCount; 3158 } 3159 3160 addInArray(child, index); 3161 3162 // tell our children 3163 if (preventRequestLayout) { 3164 child.assignParent(this); 3165 } else { 3166 child.mParent = this; 3167 } 3168 3169 if (child.hasFocus()) { 3170 requestChildFocus(child, child.findFocus()); 3171 } 3172 3173 AttachInfo ai = mAttachInfo; 3174 if (ai != null && (mGroupFlags & FLAG_PREVENT_DISPATCH_ATTACHED_TO_WINDOW) == 0) { 3175 boolean lastKeepOn = ai.mKeepScreenOn; 3176 ai.mKeepScreenOn = false; 3177 child.dispatchAttachedToWindow(mAttachInfo, (mViewFlags&VISIBILITY_MASK)); 3178 if (ai.mKeepScreenOn) { 3179 needGlobalAttributesUpdate(true); 3180 } 3181 ai.mKeepScreenOn = lastKeepOn; 3182 } 3183 3184 onViewAdded(child); 3185 3186 if ((child.mViewFlags & DUPLICATE_PARENT_STATE) == DUPLICATE_PARENT_STATE) { 3187 mGroupFlags |= FLAG_NOTIFY_CHILDREN_ON_DRAWABLE_STATE_CHANGE; 3188 } 3189 3190 if (child.hasTransientState()) { 3191 childHasTransientStateChanged(child, true); 3192 } 3193 } 3194 3195 private void addInArray(View child, int index) { 3196 View[] children = mChildren; 3197 final int count = mChildrenCount; 3198 final int size = children.length; 3199 if (index == count) { 3200 if (size == count) { 3201 mChildren = new View[size + ARRAY_CAPACITY_INCREMENT]; 3202 System.arraycopy(children, 0, mChildren, 0, size); 3203 children = mChildren; 3204 } 3205 children[mChildrenCount++] = child; 3206 } else if (index < count) { 3207 if (size == count) { 3208 mChildren = new View[size + ARRAY_CAPACITY_INCREMENT]; 3209 System.arraycopy(children, 0, mChildren, 0, index); 3210 System.arraycopy(children, index, mChildren, index + 1, count - index); 3211 children = mChildren; 3212 } else { 3213 System.arraycopy(children, index, children, index + 1, count - index); 3214 } 3215 children[index] = child; 3216 mChildrenCount++; 3217 if (mLastTouchDownIndex >= index) { 3218 mLastTouchDownIndex++; 3219 } 3220 } else { 3221 throw new IndexOutOfBoundsException("index=" + index + " count=" + count); 3222 } 3223 } 3224 3225 // This method also sets the child's mParent to null 3226 private void removeFromArray(int index) { 3227 final View[] children = mChildren; 3228 if (!(mTransitioningViews != null && mTransitioningViews.contains(children[index]))) { 3229 children[index].mParent = null; 3230 } 3231 final int count = mChildrenCount; 3232 if (index == count - 1) { 3233 children[--mChildrenCount] = null; 3234 } else if (index >= 0 && index < count) { 3235 System.arraycopy(children, index + 1, children, index, count - index - 1); 3236 children[--mChildrenCount] = null; 3237 } else { 3238 throw new IndexOutOfBoundsException(); 3239 } 3240 if (mLastTouchDownIndex == index) { 3241 mLastTouchDownTime = 0; 3242 mLastTouchDownIndex = -1; 3243 } else if (mLastTouchDownIndex > index) { 3244 mLastTouchDownIndex--; 3245 } 3246 } 3247 3248 // This method also sets the children's mParent to null 3249 private void removeFromArray(int start, int count) { 3250 final View[] children = mChildren; 3251 final int childrenCount = mChildrenCount; 3252 3253 start = Math.max(0, start); 3254 final int end = Math.min(childrenCount, start + count); 3255 3256 if (start == end) { 3257 return; 3258 } 3259 3260 if (end == childrenCount) { 3261 for (int i = start; i < end; i++) { 3262 children[i].mParent = null; 3263 children[i] = null; 3264 } 3265 } else { 3266 for (int i = start; i < end; i++) { 3267 children[i].mParent = null; 3268 } 3269 3270 // Since we're looping above, we might as well do the copy, but is arraycopy() 3271 // faster than the extra 2 bounds checks we would do in the loop? 3272 System.arraycopy(children, end, children, start, childrenCount - end); 3273 3274 for (int i = childrenCount - (end - start); i < childrenCount; i++) { 3275 children[i] = null; 3276 } 3277 } 3278 3279 mChildrenCount -= (end - start); 3280 } 3281 3282 private void bindLayoutAnimation(View child) { 3283 Animation a = mLayoutAnimationController.getAnimationForView(child); 3284 child.setAnimation(a); 3285 } 3286 3287 /** 3288 * Subclasses should override this method to set layout animation 3289 * parameters on the supplied child. 3290 * 3291 * @param child the child to associate with animation parameters 3292 * @param params the child's layout parameters which hold the animation 3293 * parameters 3294 * @param index the index of the child in the view group 3295 * @param count the number of children in the view group 3296 */ 3297 protected void attachLayoutAnimationParameters(View child, 3298 LayoutParams params, int index, int count) { 3299 LayoutAnimationController.AnimationParameters animationParams = 3300 params.layoutAnimationParameters; 3301 if (animationParams == null) { 3302 animationParams = new LayoutAnimationController.AnimationParameters(); 3303 params.layoutAnimationParameters = animationParams; 3304 } 3305 3306 animationParams.count = count; 3307 animationParams.index = index; 3308 } 3309 3310 /** 3311 * {@inheritDoc} 3312 */ 3313 public void removeView(View view) { 3314 removeViewInternal(view); 3315 requestLayout(); 3316 invalidate(true); 3317 } 3318 3319 /** 3320 * Removes a view during layout. This is useful if in your onLayout() method, 3321 * you need to remove more views. 3322 * 3323 * @param view the view to remove from the group 3324 */ 3325 public void removeViewInLayout(View view) { 3326 removeViewInternal(view); 3327 } 3328 3329 /** 3330 * Removes a range of views during layout. This is useful if in your onLayout() method, 3331 * you need to remove more views. 3332 * 3333 * @param start the index of the first view to remove from the group 3334 * @param count the number of views to remove from the group 3335 */ 3336 public void removeViewsInLayout(int start, int count) { 3337 removeViewsInternal(start, count); 3338 } 3339 3340 /** 3341 * Removes the view at the specified position in the group. 3342 * 3343 * @param index the position in the group of the view to remove 3344 */ 3345 public void removeViewAt(int index) { 3346 removeViewInternal(index, getChildAt(index)); 3347 requestLayout(); 3348 invalidate(true); 3349 } 3350 3351 /** 3352 * Removes the specified range of views from the group. 3353 * 3354 * @param start the first position in the group of the range of views to remove 3355 * @param count the number of views to remove 3356 */ 3357 public void removeViews(int start, int count) { 3358 removeViewsInternal(start, count); 3359 requestLayout(); 3360 invalidate(true); 3361 } 3362 3363 private void removeViewInternal(View view) { 3364 final int index = indexOfChild(view); 3365 if (index >= 0) { 3366 removeViewInternal(index, view); 3367 } 3368 } 3369 3370 private void removeViewInternal(int index, View view) { 3371 3372 if (mTransition != null) { 3373 mTransition.removeChild(this, view); 3374 } 3375 3376 boolean clearChildFocus = false; 3377 if (view == mFocused) { 3378 view.unFocus(); 3379 clearChildFocus = true; 3380 } 3381 3382 if (view.getAnimation() != null || 3383 (mTransitioningViews != null && mTransitioningViews.contains(view))) { 3384 addDisappearingView(view); 3385 } else if (view.mAttachInfo != null) { 3386 view.dispatchDetachedFromWindow(); 3387 } 3388 3389 if (view.hasTransientState()) { 3390 childHasTransientStateChanged(view, false); 3391 } 3392 3393 onViewRemoved(view); 3394 3395 needGlobalAttributesUpdate(false); 3396 3397 removeFromArray(index); 3398 3399 if (clearChildFocus) { 3400 clearChildFocus(view); 3401 ensureInputFocusOnFirstFocusable(); 3402 } 3403 } 3404 3405 /** 3406 * Sets the LayoutTransition object for this ViewGroup. If the LayoutTransition object is 3407 * not null, changes in layout which occur because of children being added to or removed from 3408 * the ViewGroup will be animated according to the animations defined in that LayoutTransition 3409 * object. By default, the transition object is null (so layout changes are not animated). 3410 * 3411 * @param transition The LayoutTransition object that will animated changes in layout. A value 3412 * of <code>null</code> means no transition will run on layout changes. 3413 * @attr ref android.R.styleable#ViewGroup_animateLayoutChanges 3414 */ 3415 public void setLayoutTransition(LayoutTransition transition) { 3416 if (mTransition != null) { 3417 mTransition.removeTransitionListener(mLayoutTransitionListener); 3418 } 3419 mTransition = transition; 3420 if (mTransition != null) { 3421 mTransition.addTransitionListener(mLayoutTransitionListener); 3422 } 3423 } 3424 3425 /** 3426 * Gets the LayoutTransition object for this ViewGroup. If the LayoutTransition object is 3427 * not null, changes in layout which occur because of children being added to or removed from 3428 * the ViewGroup will be animated according to the animations defined in that LayoutTransition 3429 * object. By default, the transition object is null (so layout changes are not animated). 3430 * 3431 * @return LayoutTranstion The LayoutTransition object that will animated changes in layout. 3432 * A value of <code>null</code> means no transition will run on layout changes. 3433 */ 3434 public LayoutTransition getLayoutTransition() { 3435 return mTransition; 3436 } 3437 3438 private void removeViewsInternal(int start, int count) { 3439 final View focused = mFocused; 3440 final boolean detach = mAttachInfo != null; 3441 View clearChildFocus = null; 3442 3443 final View[] children = mChildren; 3444 final int end = start + count; 3445 3446 for (int i = start; i < end; i++) { 3447 final View view = children[i]; 3448 3449 if (mTransition != null) { 3450 mTransition.removeChild(this, view); 3451 } 3452 3453 if (view == focused) { 3454 view.unFocus(); 3455 clearChildFocus = view; 3456 } 3457 3458 if (view.getAnimation() != null || 3459 (mTransitioningViews != null && mTransitioningViews.contains(view))) { 3460 addDisappearingView(view); 3461 } else if (detach) { 3462 view.dispatchDetachedFromWindow(); 3463 } 3464 3465 if (view.hasTransientState()) { 3466 childHasTransientStateChanged(view, false); 3467 } 3468 3469 needGlobalAttributesUpdate(false); 3470 3471 onViewRemoved(view); 3472 } 3473 3474 removeFromArray(start, count); 3475 3476 if (clearChildFocus != null) { 3477 clearChildFocus(clearChildFocus); 3478 ensureInputFocusOnFirstFocusable(); 3479 } 3480 } 3481 3482 /** 3483 * Call this method to remove all child views from the 3484 * ViewGroup. 3485 */ 3486 public void removeAllViews() { 3487 removeAllViewsInLayout(); 3488 requestLayout(); 3489 invalidate(true); 3490 } 3491 3492 /** 3493 * Called by a ViewGroup subclass to remove child views from itself, 3494 * when it must first know its size on screen before it can calculate how many 3495 * child views it will render. An example is a Gallery or a ListView, which 3496 * may "have" 50 children, but actually only render the number of children 3497 * that can currently fit inside the object on screen. Do not call 3498 * this method unless you are extending ViewGroup and understand the 3499 * view measuring and layout pipeline. 3500 */ 3501 public void removeAllViewsInLayout() { 3502 final int count = mChildrenCount; 3503 if (count <= 0) { 3504 return; 3505 } 3506 3507 final View[] children = mChildren; 3508 mChildrenCount = 0; 3509 3510 final View focused = mFocused; 3511 final boolean detach = mAttachInfo != null; 3512 View clearChildFocus = null; 3513 3514 needGlobalAttributesUpdate(false); 3515 3516 for (int i = count - 1; i >= 0; i--) { 3517 final View view = children[i]; 3518 3519 if (mTransition != null) { 3520 mTransition.removeChild(this, view); 3521 } 3522 3523 if (view == focused) { 3524 view.unFocus(); 3525 clearChildFocus = view; 3526 } 3527 3528 if (view.getAnimation() != null || 3529 (mTransitioningViews != null && mTransitioningViews.contains(view))) { 3530 addDisappearingView(view); 3531 } else if (detach) { 3532 view.dispatchDetachedFromWindow(); 3533 } 3534 3535 if (view.hasTransientState()) { 3536 childHasTransientStateChanged(view, false); 3537 } 3538 3539 onViewRemoved(view); 3540 3541 view.mParent = null; 3542 children[i] = null; 3543 } 3544 3545 if (clearChildFocus != null) { 3546 clearChildFocus(clearChildFocus); 3547 ensureInputFocusOnFirstFocusable(); 3548 } 3549 } 3550 3551 /** 3552 * Finishes the removal of a detached view. This method will dispatch the detached from 3553 * window event and notify the hierarchy change listener. 3554 * 3555 * @param child the child to be definitely removed from the view hierarchy 3556 * @param animate if true and the view has an animation, the view is placed in the 3557 * disappearing views list, otherwise, it is detached from the window 3558 * 3559 * @see #attachViewToParent(View, int, android.view.ViewGroup.LayoutParams) 3560 * @see #detachAllViewsFromParent() 3561 * @see #detachViewFromParent(View) 3562 * @see #detachViewFromParent(int) 3563 */ 3564 protected void removeDetachedView(View child, boolean animate) { 3565 if (mTransition != null) { 3566 mTransition.removeChild(this, child); 3567 } 3568 3569 if (child == mFocused) { 3570 child.clearFocus(); 3571 } 3572 3573 if ((animate && child.getAnimation() != null) || 3574 (mTransitioningViews != null && mTransitioningViews.contains(child))) { 3575 addDisappearingView(child); 3576 } else if (child.mAttachInfo != null) { 3577 child.dispatchDetachedFromWindow(); 3578 } 3579 3580 if (child.hasTransientState()) { 3581 childHasTransientStateChanged(child, false); 3582 } 3583 3584 onViewRemoved(child); 3585 } 3586 3587 /** 3588 * Attaches a view to this view group. Attaching a view assigns this group as the parent, 3589 * sets the layout parameters and puts the view in the list of children so it can be retrieved 3590 * by calling {@link #getChildAt(int)}. 3591 * 3592 * This method should be called only for view which were detached from their parent. 3593 * 3594 * @param child the child to attach 3595 * @param index the index at which the child should be attached 3596 * @param params the layout parameters of the child 3597 * 3598 * @see #removeDetachedView(View, boolean) 3599 * @see #detachAllViewsFromParent() 3600 * @see #detachViewFromParent(View) 3601 * @see #detachViewFromParent(int) 3602 */ 3603 protected void attachViewToParent(View child, int index, LayoutParams params) { 3604 child.mLayoutParams = params; 3605 3606 if (index < 0) { 3607 index = mChildrenCount; 3608 } 3609 3610 addInArray(child, index); 3611 3612 child.mParent = this; 3613 child.mPrivateFlags = (child.mPrivateFlags & ~DIRTY_MASK & ~DRAWING_CACHE_VALID) | 3614 DRAWN | INVALIDATED; 3615 this.mPrivateFlags |= INVALIDATED; 3616 3617 if (child.hasFocus()) { 3618 requestChildFocus(child, child.findFocus()); 3619 } 3620 } 3621 3622 /** 3623 * Detaches a view from its parent. Detaching a view should be temporary and followed 3624 * either by a call to {@link #attachViewToParent(View, int, android.view.ViewGroup.LayoutParams)} 3625 * or a call to {@link #removeDetachedView(View, boolean)}. When a view is detached, 3626 * its parent is null and cannot be retrieved by a call to {@link #getChildAt(int)}. 3627 * 3628 * @param child the child to detach 3629 * 3630 * @see #detachViewFromParent(int) 3631 * @see #detachViewsFromParent(int, int) 3632 * @see #detachAllViewsFromParent() 3633 * @see #attachViewToParent(View, int, android.view.ViewGroup.LayoutParams) 3634 * @see #removeDetachedView(View, boolean) 3635 */ 3636 protected void detachViewFromParent(View child) { 3637 removeFromArray(indexOfChild(child)); 3638 } 3639 3640 /** 3641 * Detaches a view from its parent. Detaching a view should be temporary and followed 3642 * either by a call to {@link #attachViewToParent(View, int, android.view.ViewGroup.LayoutParams)} 3643 * or a call to {@link #removeDetachedView(View, boolean)}. When a view is detached, 3644 * its parent is null and cannot be retrieved by a call to {@link #getChildAt(int)}. 3645 * 3646 * @param index the index of the child to detach 3647 * 3648 * @see #detachViewFromParent(View) 3649 * @see #detachAllViewsFromParent() 3650 * @see #detachViewsFromParent(int, int) 3651 * @see #attachViewToParent(View, int, android.view.ViewGroup.LayoutParams) 3652 * @see #removeDetachedView(View, boolean) 3653 */ 3654 protected void detachViewFromParent(int index) { 3655 removeFromArray(index); 3656 } 3657 3658 /** 3659 * Detaches a range of view from their parent. Detaching a view should be temporary and followed 3660 * either by a call to {@link #attachViewToParent(View, int, android.view.ViewGroup.LayoutParams)} 3661 * or a call to {@link #removeDetachedView(View, boolean)}. When a view is detached, its 3662 * parent is null and cannot be retrieved by a call to {@link #getChildAt(int)}. 3663 * 3664 * @param start the first index of the childrend range to detach 3665 * @param count the number of children to detach 3666 * 3667 * @see #detachViewFromParent(View) 3668 * @see #detachViewFromParent(int) 3669 * @see #detachAllViewsFromParent() 3670 * @see #attachViewToParent(View, int, android.view.ViewGroup.LayoutParams) 3671 * @see #removeDetachedView(View, boolean) 3672 */ 3673 protected void detachViewsFromParent(int start, int count) { 3674 removeFromArray(start, count); 3675 } 3676 3677 /** 3678 * Detaches all views from the parent. Detaching a view should be temporary and followed 3679 * either by a call to {@link #attachViewToParent(View, int, android.view.ViewGroup.LayoutParams)} 3680 * or a call to {@link #removeDetachedView(View, boolean)}. When a view is detached, 3681 * its parent is null and cannot be retrieved by a call to {@link #getChildAt(int)}. 3682 * 3683 * @see #detachViewFromParent(View) 3684 * @see #detachViewFromParent(int) 3685 * @see #detachViewsFromParent(int, int) 3686 * @see #attachViewToParent(View, int, android.view.ViewGroup.LayoutParams) 3687 * @see #removeDetachedView(View, boolean) 3688 */ 3689 protected void detachAllViewsFromParent() { 3690 final int count = mChildrenCount; 3691 if (count <= 0) { 3692 return; 3693 } 3694 3695 final View[] children = mChildren; 3696 mChildrenCount = 0; 3697 3698 for (int i = count - 1; i >= 0; i--) { 3699 children[i].mParent = null; 3700 children[i] = null; 3701 } 3702 } 3703 3704 /** 3705 * Don't call or override this method. It is used for the implementation of 3706 * the view hierarchy. 3707 */ 3708 public final void invalidateChild(View child, final Rect dirty) { 3709 if (ViewDebug.TRACE_HIERARCHY) { 3710 ViewDebug.trace(this, ViewDebug.HierarchyTraceType.INVALIDATE_CHILD); 3711 } 3712 3713 ViewParent parent = this; 3714 3715 final AttachInfo attachInfo = mAttachInfo; 3716 if (attachInfo != null) { 3717 // If the child is drawing an animation, we want to copy this flag onto 3718 // ourselves and the parent to make sure the invalidate request goes 3719 // through 3720 final boolean drawAnimation = (child.mPrivateFlags & DRAW_ANIMATION) == DRAW_ANIMATION; 3721 3722 //noinspection PointlessBooleanExpression 3723 if (!HardwareRenderer.RENDER_DIRTY_REGIONS) { 3724 if (dirty == null) { 3725 if (child.mLayerType != LAYER_TYPE_NONE) { 3726 mPrivateFlags |= INVALIDATED; 3727 mPrivateFlags &= ~DRAWING_CACHE_VALID; 3728 child.mLocalDirtyRect.setEmpty(); 3729 } 3730 do { 3731 View view = null; 3732 if (parent instanceof View) { 3733 view = (View) parent; 3734 if (view.mLayerType != LAYER_TYPE_NONE) { 3735 view.mLocalDirtyRect.setEmpty(); 3736 if (view.getParent() instanceof View) { 3737 final View grandParent = (View) view.getParent(); 3738 grandParent.mPrivateFlags |= INVALIDATED; 3739 grandParent.mPrivateFlags &= ~DRAWING_CACHE_VALID; 3740 } 3741 } 3742 if ((view.mPrivateFlags & DIRTY_MASK) != 0) { 3743 // already marked dirty - we're done 3744 break; 3745 } 3746 } 3747 3748 if (drawAnimation) { 3749 if (view != null) { 3750 view.mPrivateFlags |= DRAW_ANIMATION; 3751 } else if (parent instanceof ViewRootImpl) { 3752 ((ViewRootImpl) parent).mIsAnimating = true; 3753 } 3754 } 3755 3756 if (parent instanceof ViewRootImpl) { 3757 ((ViewRootImpl) parent).invalidate(); 3758 parent = null; 3759 } else if (view != null) { 3760 if ((view.mPrivateFlags & DRAWN) == DRAWN || 3761 (view.mPrivateFlags & DRAWING_CACHE_VALID) == DRAWING_CACHE_VALID) { 3762 view.mPrivateFlags &= ~DRAWING_CACHE_VALID; 3763 view.mPrivateFlags |= DIRTY; 3764 parent = view.mParent; 3765 } else { 3766 parent = null; 3767 } 3768 } 3769 } while (parent != null); 3770 } 3771 3772 return; 3773 } 3774 3775 // Check whether the child that requests the invalidate is fully opaque 3776 // Views being animated or transformed are not considered opaque because we may 3777 // be invalidating their old position and need the parent to paint behind them. 3778 Matrix childMatrix = child.getMatrix(); 3779 final boolean isOpaque = child.isOpaque() && !drawAnimation && 3780 child.getAnimation() == null && childMatrix.isIdentity(); 3781 // Mark the child as dirty, using the appropriate flag 3782 // Make sure we do not set both flags at the same time 3783 int opaqueFlag = isOpaque ? DIRTY_OPAQUE : DIRTY; 3784 3785 if (child.mLayerType != LAYER_TYPE_NONE) { 3786 mPrivateFlags |= INVALIDATED; 3787 mPrivateFlags &= ~DRAWING_CACHE_VALID; 3788 child.mLocalDirtyRect.union(dirty); 3789 } 3790 3791 final int[] location = attachInfo.mInvalidateChildLocation; 3792 location[CHILD_LEFT_INDEX] = child.mLeft; 3793 location[CHILD_TOP_INDEX] = child.mTop; 3794 if (!childMatrix.isIdentity()) { 3795 RectF boundingRect = attachInfo.mTmpTransformRect; 3796 boundingRect.set(dirty); 3797 //boundingRect.inset(-0.5f, -0.5f); 3798 childMatrix.mapRect(boundingRect); 3799 dirty.set((int) (boundingRect.left - 0.5f), 3800 (int) (boundingRect.top - 0.5f), 3801 (int) (boundingRect.right + 0.5f), 3802 (int) (boundingRect.bottom + 0.5f)); 3803 } 3804 3805 do { 3806 View view = null; 3807 if (parent instanceof View) { 3808 view = (View) parent; 3809 if (view.mLayerType != LAYER_TYPE_NONE && 3810 view.getParent() instanceof View) { 3811 final View grandParent = (View) view.getParent(); 3812 grandParent.mPrivateFlags |= INVALIDATED; 3813 grandParent.mPrivateFlags &= ~DRAWING_CACHE_VALID; 3814 } 3815 } 3816 3817 if (drawAnimation) { 3818 if (view != null) { 3819 view.mPrivateFlags |= DRAW_ANIMATION; 3820 } else if (parent instanceof ViewRootImpl) { 3821 ((ViewRootImpl) parent).mIsAnimating = true; 3822 } 3823 } 3824 3825 // If the parent is dirty opaque or not dirty, mark it dirty with the opaque 3826 // flag coming from the child that initiated the invalidate 3827 if (view != null) { 3828 if ((view.mViewFlags & FADING_EDGE_MASK) != 0 && 3829 view.getSolidColor() == 0) { 3830 opaqueFlag = DIRTY; 3831 } 3832 if ((view.mPrivateFlags & DIRTY_MASK) != DIRTY) { 3833 view.mPrivateFlags = (view.mPrivateFlags & ~DIRTY_MASK) | opaqueFlag; 3834 } 3835 } 3836 3837 parent = parent.invalidateChildInParent(location, dirty); 3838 if (view != null) { 3839 // Account for transform on current parent 3840 Matrix m = view.getMatrix(); 3841 if (!m.isIdentity()) { 3842 RectF boundingRect = attachInfo.mTmpTransformRect; 3843 boundingRect.set(dirty); 3844 m.mapRect(boundingRect); 3845 dirty.set((int) (boundingRect.left - 0.5f), 3846 (int) (boundingRect.top - 0.5f), 3847 (int) (boundingRect.right + 0.5f), 3848 (int) (boundingRect.bottom + 0.5f)); 3849 } 3850 } 3851 } while (parent != null); 3852 } 3853 } 3854 3855 /** 3856 * Don't call or override this method. It is used for the implementation of 3857 * the view hierarchy. 3858 * 3859 * This implementation returns null if this ViewGroup does not have a parent, 3860 * if this ViewGroup is already fully invalidated or if the dirty rectangle 3861 * does not intersect with this ViewGroup's bounds. 3862 */ 3863 public ViewParent invalidateChildInParent(final int[] location, final Rect dirty) { 3864 if (ViewDebug.TRACE_HIERARCHY) { 3865 ViewDebug.trace(this, ViewDebug.HierarchyTraceType.INVALIDATE_CHILD_IN_PARENT); 3866 } 3867 3868 if ((mPrivateFlags & DRAWN) == DRAWN || 3869 (mPrivateFlags & DRAWING_CACHE_VALID) == DRAWING_CACHE_VALID) { 3870 if ((mGroupFlags & (FLAG_OPTIMIZE_INVALIDATE | FLAG_ANIMATION_DONE)) != 3871 FLAG_OPTIMIZE_INVALIDATE) { 3872 dirty.offset(location[CHILD_LEFT_INDEX] - mScrollX, 3873 location[CHILD_TOP_INDEX] - mScrollY); 3874 3875 final int left = mLeft; 3876 final int top = mTop; 3877 3878 if ((mGroupFlags & FLAG_CLIP_CHILDREN) != FLAG_CLIP_CHILDREN || 3879 dirty.intersect(0, 0, mRight - left, mBottom - top) || 3880 (mPrivateFlags & DRAW_ANIMATION) == DRAW_ANIMATION) { 3881 mPrivateFlags &= ~DRAWING_CACHE_VALID; 3882 3883 location[CHILD_LEFT_INDEX] = left; 3884 location[CHILD_TOP_INDEX] = top; 3885 3886 if (mLayerType != LAYER_TYPE_NONE) { 3887 mLocalDirtyRect.union(dirty); 3888 } 3889 3890 return mParent; 3891 } 3892 } else { 3893 mPrivateFlags &= ~DRAWN & ~DRAWING_CACHE_VALID; 3894 3895 location[CHILD_LEFT_INDEX] = mLeft; 3896 location[CHILD_TOP_INDEX] = mTop; 3897 if ((mGroupFlags & FLAG_CLIP_CHILDREN) == FLAG_CLIP_CHILDREN) { 3898 dirty.set(0, 0, mRight - mLeft, mBottom - mTop); 3899 } else { 3900 // in case the dirty rect extends outside the bounds of this container 3901 dirty.union(0, 0, mRight - mLeft, mBottom - mTop); 3902 } 3903 3904 if (mLayerType != LAYER_TYPE_NONE) { 3905 mLocalDirtyRect.union(dirty); 3906 } 3907 3908 return mParent; 3909 } 3910 } 3911 3912 return null; 3913 } 3914 3915 /** 3916 * Quick invalidation method called by View.invalidateViewProperty. This doesn't set the 3917 * DRAWN flags and doesn't handle the Animation logic that the default invalidation methods 3918 * do; all we want to do here is schedule a traversal with the appropriate dirty rect. 3919 * 3920 * @hide 3921 */ 3922 public void invalidateChildFast(View child, final Rect dirty) { 3923 ViewParent parent = this; 3924 3925 final AttachInfo attachInfo = mAttachInfo; 3926 if (attachInfo != null) { 3927 if (child.mLayerType != LAYER_TYPE_NONE) { 3928 child.mLocalDirtyRect.union(dirty); 3929 } 3930 3931 int left = child.mLeft; 3932 int top = child.mTop; 3933 if (!child.getMatrix().isIdentity()) { 3934 child.transformRect(dirty); 3935 } 3936 3937 do { 3938 if (parent instanceof ViewGroup) { 3939 ViewGroup parentVG = (ViewGroup) parent; 3940 if (parentVG.mLayerType != LAYER_TYPE_NONE) { 3941 // Layered parents should be recreated, not just re-issued 3942 parentVG.invalidate(); 3943 parent = null; 3944 } else { 3945 parent = parentVG.invalidateChildInParentFast(left, top, dirty); 3946 left = parentVG.mLeft; 3947 top = parentVG.mTop; 3948 } 3949 } else { 3950 // Reached the top; this calls into the usual invalidate method in 3951 // ViewRootImpl, which schedules a traversal 3952 final int[] location = attachInfo.mInvalidateChildLocation; 3953 location[0] = left; 3954 location[1] = top; 3955 parent = parent.invalidateChildInParent(location, dirty); 3956 } 3957 } while (parent != null); 3958 } 3959 } 3960 3961 /** 3962 * Quick invalidation method that simply transforms the dirty rect into the parent's 3963 * coordinate system, pruning the invalidation if the parent has already been invalidated. 3964 */ 3965 private ViewParent invalidateChildInParentFast(int left, int top, final Rect dirty) { 3966 if ((mPrivateFlags & DRAWN) == DRAWN || 3967 (mPrivateFlags & DRAWING_CACHE_VALID) == DRAWING_CACHE_VALID) { 3968 dirty.offset(left - mScrollX, top - mScrollY); 3969 3970 if ((mGroupFlags & FLAG_CLIP_CHILDREN) == 0 || 3971 dirty.intersect(0, 0, mRight - mLeft, mBottom - mTop)) { 3972 3973 if (mLayerType != LAYER_TYPE_NONE) { 3974 mLocalDirtyRect.union(dirty); 3975 } 3976 if (!getMatrix().isIdentity()) { 3977 transformRect(dirty); 3978 } 3979 3980 return mParent; 3981 } 3982 } 3983 3984 return null; 3985 } 3986 3987 /** 3988 * Offset a rectangle that is in a descendant's coordinate 3989 * space into our coordinate space. 3990 * @param descendant A descendant of this view 3991 * @param rect A rectangle defined in descendant's coordinate space. 3992 */ 3993 public final void offsetDescendantRectToMyCoords(View descendant, Rect rect) { 3994 offsetRectBetweenParentAndChild(descendant, rect, true, false); 3995 } 3996 3997 /** 3998 * Offset a rectangle that is in our coordinate space into an ancestor's 3999 * coordinate space. 4000 * @param descendant A descendant of this view 4001 * @param rect A rectangle defined in descendant's coordinate space. 4002 */ 4003 public final void offsetRectIntoDescendantCoords(View descendant, Rect rect) { 4004 offsetRectBetweenParentAndChild(descendant, rect, false, false); 4005 } 4006 4007 /** 4008 * Helper method that offsets a rect either from parent to descendant or 4009 * descendant to parent. 4010 */ 4011 void offsetRectBetweenParentAndChild(View descendant, Rect rect, 4012 boolean offsetFromChildToParent, boolean clipToBounds) { 4013 4014 // already in the same coord system :) 4015 if (descendant == this) { 4016 return; 4017 } 4018 4019 ViewParent theParent = descendant.mParent; 4020 4021 // search and offset up to the parent 4022 while ((theParent != null) 4023 && (theParent instanceof View) 4024 && (theParent != this)) { 4025 4026 if (offsetFromChildToParent) { 4027 rect.offset(descendant.mLeft - descendant.mScrollX, 4028 descendant.mTop - descendant.mScrollY); 4029 if (clipToBounds) { 4030 View p = (View) theParent; 4031 rect.intersect(0, 0, p.mRight - p.mLeft, p.mBottom - p.mTop); 4032 } 4033 } else { 4034 if (clipToBounds) { 4035 View p = (View) theParent; 4036 rect.intersect(0, 0, p.mRight - p.mLeft, p.mBottom - p.mTop); 4037 } 4038 rect.offset(descendant.mScrollX - descendant.mLeft, 4039 descendant.mScrollY - descendant.mTop); 4040 } 4041 4042 descendant = (View) theParent; 4043 theParent = descendant.mParent; 4044 } 4045 4046 // now that we are up to this view, need to offset one more time 4047 // to get into our coordinate space 4048 if (theParent == this) { 4049 if (offsetFromChildToParent) { 4050 rect.offset(descendant.mLeft - descendant.mScrollX, 4051 descendant.mTop - descendant.mScrollY); 4052 } else { 4053 rect.offset(descendant.mScrollX - descendant.mLeft, 4054 descendant.mScrollY - descendant.mTop); 4055 } 4056 } else { 4057 throw new IllegalArgumentException("parameter must be a descendant of this view"); 4058 } 4059 } 4060 4061 /** 4062 * Offset the vertical location of all children of this view by the specified number of pixels. 4063 * 4064 * @param offset the number of pixels to offset 4065 * 4066 * @hide 4067 */ 4068 public void offsetChildrenTopAndBottom(int offset) { 4069 final int count = mChildrenCount; 4070 final View[] children = mChildren; 4071 4072 for (int i = 0; i < count; i++) { 4073 final View v = children[i]; 4074 v.mTop += offset; 4075 v.mBottom += offset; 4076 if (USE_DISPLAY_LIST_PROPERTIES && v.mDisplayList != null) { 4077 v.mDisplayList.offsetTopBottom(offset); 4078 invalidateViewProperty(false, false); 4079 } 4080 } 4081 } 4082 4083 /** 4084 * {@inheritDoc} 4085 */ 4086 public boolean getChildVisibleRect(View child, Rect r, android.graphics.Point offset) { 4087 // It doesn't make a whole lot of sense to call this on a view that isn't attached, 4088 // but for some simple tests it can be useful. If we don't have attach info this 4089 // will allocate memory. 4090 final RectF rect = mAttachInfo != null ? mAttachInfo.mTmpTransformRect : new RectF(); 4091 rect.set(r); 4092 4093 if (!child.hasIdentityMatrix()) { 4094 child.getMatrix().mapRect(rect); 4095 } 4096 4097 int dx = child.mLeft - mScrollX; 4098 int dy = child.mTop - mScrollY; 4099 4100 rect.offset(dx, dy); 4101 4102 if (offset != null) { 4103 if (!child.hasIdentityMatrix()) { 4104 float[] position = mAttachInfo != null ? mAttachInfo.mTmpTransformLocation 4105 : new float[2]; 4106 position[0] = offset.x; 4107 position[1] = offset.y; 4108 child.getMatrix().mapPoints(position); 4109 offset.x = (int) (position[0] + 0.5f); 4110 offset.y = (int) (position[1] + 0.5f); 4111 } 4112 offset.x += dx; 4113 offset.y += dy; 4114 } 4115 4116 if (rect.intersect(0, 0, mRight - mLeft, mBottom - mTop)) { 4117 if (mParent == null) return true; 4118 r.set((int) (rect.left + 0.5f), (int) (rect.top + 0.5f), 4119 (int) (rect.right + 0.5f), (int) (rect.bottom + 0.5f)); 4120 return mParent.getChildVisibleRect(this, r, offset); 4121 } 4122 4123 return false; 4124 } 4125 4126 /** 4127 * {@inheritDoc} 4128 */ 4129 @Override 4130 public final void layout(int l, int t, int r, int b) { 4131 if (mTransition == null || !mTransition.isChangingLayout()) { 4132 super.layout(l, t, r, b); 4133 } else { 4134 // record the fact that we noop'd it; request layout when transition finishes 4135 mLayoutSuppressed = true; 4136 } 4137 } 4138 4139 /** 4140 * {@inheritDoc} 4141 */ 4142 @Override 4143 protected abstract void onLayout(boolean changed, 4144 int l, int t, int r, int b); 4145 4146 /** 4147 * Indicates whether the view group has the ability to animate its children 4148 * after the first layout. 4149 * 4150 * @return true if the children can be animated, false otherwise 4151 */ 4152 protected boolean canAnimate() { 4153 return mLayoutAnimationController != null; 4154 } 4155 4156 /** 4157 * Runs the layout animation. Calling this method triggers a relayout of 4158 * this view group. 4159 */ 4160 public void startLayoutAnimation() { 4161 if (mLayoutAnimationController != null) { 4162 mGroupFlags |= FLAG_RUN_ANIMATION; 4163 requestLayout(); 4164 } 4165 } 4166 4167 /** 4168 * Schedules the layout animation to be played after the next layout pass 4169 * of this view group. This can be used to restart the layout animation 4170 * when the content of the view group changes or when the activity is 4171 * paused and resumed. 4172 */ 4173 public void scheduleLayoutAnimation() { 4174 mGroupFlags |= FLAG_RUN_ANIMATION; 4175 } 4176 4177 /** 4178 * Sets the layout animation controller used to animate the group's 4179 * children after the first layout. 4180 * 4181 * @param controller the animation controller 4182 */ 4183 public void setLayoutAnimation(LayoutAnimationController controller) { 4184 mLayoutAnimationController = controller; 4185 if (mLayoutAnimationController != null) { 4186 mGroupFlags |= FLAG_RUN_ANIMATION; 4187 } 4188 } 4189 4190 /** 4191 * Returns the layout animation controller used to animate the group's 4192 * children. 4193 * 4194 * @return the current animation controller 4195 */ 4196 public LayoutAnimationController getLayoutAnimation() { 4197 return mLayoutAnimationController; 4198 } 4199 4200 /** 4201 * Indicates whether the children's drawing cache is used during a layout 4202 * animation. By default, the drawing cache is enabled but this will prevent 4203 * nested layout animations from working. To nest animations, you must disable 4204 * the cache. 4205 * 4206 * @return true if the animation cache is enabled, false otherwise 4207 * 4208 * @see #setAnimationCacheEnabled(boolean) 4209 * @see View#setDrawingCacheEnabled(boolean) 4210 */ 4211 @ViewDebug.ExportedProperty 4212 public boolean isAnimationCacheEnabled() { 4213 return (mGroupFlags & FLAG_ANIMATION_CACHE) == FLAG_ANIMATION_CACHE; 4214 } 4215 4216 /** 4217 * Enables or disables the children's drawing cache during a layout animation. 4218 * By default, the drawing cache is enabled but this will prevent nested 4219 * layout animations from working. To nest animations, you must disable the 4220 * cache. 4221 * 4222 * @param enabled true to enable the animation cache, false otherwise 4223 * 4224 * @see #isAnimationCacheEnabled() 4225 * @see View#setDrawingCacheEnabled(boolean) 4226 */ 4227 public void setAnimationCacheEnabled(boolean enabled) { 4228 setBooleanFlag(FLAG_ANIMATION_CACHE, enabled); 4229 } 4230 4231 /** 4232 * Indicates whether this ViewGroup will always try to draw its children using their 4233 * drawing cache. By default this property is enabled. 4234 * 4235 * @return true if the animation cache is enabled, false otherwise 4236 * 4237 * @see #setAlwaysDrawnWithCacheEnabled(boolean) 4238 * @see #setChildrenDrawnWithCacheEnabled(boolean) 4239 * @see View#setDrawingCacheEnabled(boolean) 4240 */ 4241 @ViewDebug.ExportedProperty(category = "drawing") 4242 public boolean isAlwaysDrawnWithCacheEnabled() { 4243 return (mGroupFlags & FLAG_ALWAYS_DRAWN_WITH_CACHE) == FLAG_ALWAYS_DRAWN_WITH_CACHE; 4244 } 4245 4246 /** 4247 * Indicates whether this ViewGroup will always try to draw its children using their 4248 * drawing cache. This property can be set to true when the cache rendering is 4249 * slightly different from the children's normal rendering. Renderings can be different, 4250 * for instance, when the cache's quality is set to low. 4251 * 4252 * When this property is disabled, the ViewGroup will use the drawing cache of its 4253 * children only when asked to. It's usually the task of subclasses to tell ViewGroup 4254 * when to start using the drawing cache and when to stop using it. 4255 * 4256 * @param always true to always draw with the drawing cache, false otherwise 4257 * 4258 * @see #isAlwaysDrawnWithCacheEnabled() 4259 * @see #setChildrenDrawnWithCacheEnabled(boolean) 4260 * @see View#setDrawingCacheEnabled(boolean) 4261 * @see View#setDrawingCacheQuality(int) 4262 */ 4263 public void setAlwaysDrawnWithCacheEnabled(boolean always) { 4264 setBooleanFlag(FLAG_ALWAYS_DRAWN_WITH_CACHE, always); 4265 } 4266 4267 /** 4268 * Indicates whether the ViewGroup is currently drawing its children using 4269 * their drawing cache. 4270 * 4271 * @return true if children should be drawn with their cache, false otherwise 4272 * 4273 * @see #setAlwaysDrawnWithCacheEnabled(boolean) 4274 * @see #setChildrenDrawnWithCacheEnabled(boolean) 4275 */ 4276 @ViewDebug.ExportedProperty(category = "drawing") 4277 protected boolean isChildrenDrawnWithCacheEnabled() { 4278 return (mGroupFlags & FLAG_CHILDREN_DRAWN_WITH_CACHE) == FLAG_CHILDREN_DRAWN_WITH_CACHE; 4279 } 4280 4281 /** 4282 * Tells the ViewGroup to draw its children using their drawing cache. This property 4283 * is ignored when {@link #isAlwaysDrawnWithCacheEnabled()} is true. A child's drawing cache 4284 * will be used only if it has been enabled. 4285 * 4286 * Subclasses should call this method to start and stop using the drawing cache when 4287 * they perform performance sensitive operations, like scrolling or animating. 4288 * 4289 * @param enabled true if children should be drawn with their cache, false otherwise 4290 * 4291 * @see #setAlwaysDrawnWithCacheEnabled(boolean) 4292 * @see #isChildrenDrawnWithCacheEnabled() 4293 */ 4294 protected void setChildrenDrawnWithCacheEnabled(boolean enabled) { 4295 setBooleanFlag(FLAG_CHILDREN_DRAWN_WITH_CACHE, enabled); 4296 } 4297 4298 /** 4299 * Indicates whether the ViewGroup is drawing its children in the order defined by 4300 * {@link #getChildDrawingOrder(int, int)}. 4301 * 4302 * @return true if children drawing order is defined by {@link #getChildDrawingOrder(int, int)}, 4303 * false otherwise 4304 * 4305 * @see #setChildrenDrawingOrderEnabled(boolean) 4306 * @see #getChildDrawingOrder(int, int) 4307 */ 4308 @ViewDebug.ExportedProperty(category = "drawing") 4309 protected boolean isChildrenDrawingOrderEnabled() { 4310 return (mGroupFlags & FLAG_USE_CHILD_DRAWING_ORDER) == FLAG_USE_CHILD_DRAWING_ORDER; 4311 } 4312 4313 /** 4314 * Tells the ViewGroup whether to draw its children in the order defined by the method 4315 * {@link #getChildDrawingOrder(int, int)}. 4316 * 4317 * @param enabled true if the order of the children when drawing is determined by 4318 * {@link #getChildDrawingOrder(int, int)}, false otherwise 4319 * 4320 * @see #isChildrenDrawingOrderEnabled() 4321 * @see #getChildDrawingOrder(int, int) 4322 */ 4323 protected void setChildrenDrawingOrderEnabled(boolean enabled) { 4324 setBooleanFlag(FLAG_USE_CHILD_DRAWING_ORDER, enabled); 4325 } 4326 4327 private void setBooleanFlag(int flag, boolean value) { 4328 if (value) { 4329 mGroupFlags |= flag; 4330 } else { 4331 mGroupFlags &= ~flag; 4332 } 4333 } 4334 4335 /** 4336 * Returns an integer indicating what types of drawing caches are kept in memory. 4337 * 4338 * @see #setPersistentDrawingCache(int) 4339 * @see #setAnimationCacheEnabled(boolean) 4340 * 4341 * @return one or a combination of {@link #PERSISTENT_NO_CACHE}, 4342 * {@link #PERSISTENT_ANIMATION_CACHE}, {@link #PERSISTENT_SCROLLING_CACHE} 4343 * and {@link #PERSISTENT_ALL_CACHES} 4344 */ 4345 @ViewDebug.ExportedProperty(category = "drawing", mapping = { 4346 @ViewDebug.IntToString(from = PERSISTENT_NO_CACHE, to = "NONE"), 4347 @ViewDebug.IntToString(from = PERSISTENT_ANIMATION_CACHE, to = "ANIMATION"), 4348 @ViewDebug.IntToString(from = PERSISTENT_SCROLLING_CACHE, to = "SCROLLING"), 4349 @ViewDebug.IntToString(from = PERSISTENT_ALL_CACHES, to = "ALL") 4350 }) 4351 public int getPersistentDrawingCache() { 4352 return mPersistentDrawingCache; 4353 } 4354 4355 /** 4356 * Indicates what types of drawing caches should be kept in memory after 4357 * they have been created. 4358 * 4359 * @see #getPersistentDrawingCache() 4360 * @see #setAnimationCacheEnabled(boolean) 4361 * 4362 * @param drawingCacheToKeep one or a combination of {@link #PERSISTENT_NO_CACHE}, 4363 * {@link #PERSISTENT_ANIMATION_CACHE}, {@link #PERSISTENT_SCROLLING_CACHE} 4364 * and {@link #PERSISTENT_ALL_CACHES} 4365 */ 4366 public void setPersistentDrawingCache(int drawingCacheToKeep) { 4367 mPersistentDrawingCache = drawingCacheToKeep & PERSISTENT_ALL_CACHES; 4368 } 4369 4370 /** 4371 * Returns a new set of layout parameters based on the supplied attributes set. 4372 * 4373 * @param attrs the attributes to build the layout parameters from 4374 * 4375 * @return an instance of {@link android.view.ViewGroup.LayoutParams} or one 4376 * of its descendants 4377 */ 4378 public LayoutParams generateLayoutParams(AttributeSet attrs) { 4379 return new LayoutParams(getContext(), attrs); 4380 } 4381 4382 /** 4383 * Returns a safe set of layout parameters based on the supplied layout params. 4384 * When a ViewGroup is passed a View whose layout params do not pass the test of 4385 * {@link #checkLayoutParams(android.view.ViewGroup.LayoutParams)}, this method 4386 * is invoked. This method should return a new set of layout params suitable for 4387 * this ViewGroup, possibly by copying the appropriate attributes from the 4388 * specified set of layout params. 4389 * 4390 * @param p The layout parameters to convert into a suitable set of layout parameters 4391 * for this ViewGroup. 4392 * 4393 * @return an instance of {@link android.view.ViewGroup.LayoutParams} or one 4394 * of its descendants 4395 */ 4396 protected LayoutParams generateLayoutParams(ViewGroup.LayoutParams p) { 4397 return p; 4398 } 4399 4400 /** 4401 * Returns a set of default layout parameters. These parameters are requested 4402 * when the View passed to {@link #addView(View)} has no layout parameters 4403 * already set. If null is returned, an exception is thrown from addView. 4404 * 4405 * @return a set of default layout parameters or null 4406 */ 4407 protected LayoutParams generateDefaultLayoutParams() { 4408 return new LayoutParams(LayoutParams.WRAP_CONTENT, LayoutParams.WRAP_CONTENT); 4409 } 4410 4411 /** 4412 * @hide 4413 */ 4414 @Override 4415 protected boolean dispatchConsistencyCheck(int consistency) { 4416 boolean result = super.dispatchConsistencyCheck(consistency); 4417 4418 final int count = mChildrenCount; 4419 final View[] children = mChildren; 4420 for (int i = 0; i < count; i++) { 4421 if (!children[i].dispatchConsistencyCheck(consistency)) result = false; 4422 } 4423 4424 return result; 4425 } 4426 4427 /** 4428 * @hide 4429 */ 4430 @Override 4431 protected boolean onConsistencyCheck(int consistency) { 4432 boolean result = super.onConsistencyCheck(consistency); 4433 4434 final boolean checkLayout = (consistency & ViewDebug.CONSISTENCY_LAYOUT) != 0; 4435 final boolean checkDrawing = (consistency & ViewDebug.CONSISTENCY_DRAWING) != 0; 4436 4437 if (checkLayout) { 4438 final int count = mChildrenCount; 4439 final View[] children = mChildren; 4440 for (int i = 0; i < count; i++) { 4441 if (children[i].getParent() != this) { 4442 result = false; 4443 android.util.Log.d(ViewDebug.CONSISTENCY_LOG_TAG, 4444 "View " + children[i] + " has no parent/a parent that is not " + this); 4445 } 4446 } 4447 } 4448 4449 if (checkDrawing) { 4450 // If this group is dirty, check that the parent is dirty as well 4451 if ((mPrivateFlags & DIRTY_MASK) != 0) { 4452 final ViewParent parent = getParent(); 4453 if (parent != null && !(parent instanceof ViewRootImpl)) { 4454 if ((((View) parent).mPrivateFlags & DIRTY_MASK) == 0) { 4455 result = false; 4456 android.util.Log.d(ViewDebug.CONSISTENCY_LOG_TAG, 4457 "ViewGroup " + this + " is dirty but its parent is not: " + this); 4458 } 4459 } 4460 } 4461 } 4462 4463 return result; 4464 } 4465 4466 /** 4467 * {@inheritDoc} 4468 */ 4469 @Override 4470 protected void debug(int depth) { 4471 super.debug(depth); 4472 String output; 4473 4474 if (mFocused != null) { 4475 output = debugIndent(depth); 4476 output += "mFocused"; 4477 Log.d(VIEW_LOG_TAG, output); 4478 } 4479 if (mChildrenCount != 0) { 4480 output = debugIndent(depth); 4481 output += "{"; 4482 Log.d(VIEW_LOG_TAG, output); 4483 } 4484 int count = mChildrenCount; 4485 for (int i = 0; i < count; i++) { 4486 View child = mChildren[i]; 4487 child.debug(depth + 1); 4488 } 4489 4490 if (mChildrenCount != 0) { 4491 output = debugIndent(depth); 4492 output += "}"; 4493 Log.d(VIEW_LOG_TAG, output); 4494 } 4495 } 4496 4497 /** 4498 * Returns the position in the group of the specified child view. 4499 * 4500 * @param child the view for which to get the position 4501 * @return a positive integer representing the position of the view in the 4502 * group, or -1 if the view does not exist in the group 4503 */ 4504 public int indexOfChild(View child) { 4505 final int count = mChildrenCount; 4506 final View[] children = mChildren; 4507 for (int i = 0; i < count; i++) { 4508 if (children[i] == child) { 4509 return i; 4510 } 4511 } 4512 return -1; 4513 } 4514 4515 /** 4516 * Returns the number of children in the group. 4517 * 4518 * @return a positive integer representing the number of children in 4519 * the group 4520 */ 4521 public int getChildCount() { 4522 return mChildrenCount; 4523 } 4524 4525 /** 4526 * Returns the view at the specified position in the group. 4527 * 4528 * @param index the position at which to get the view from 4529 * @return the view at the specified position or null if the position 4530 * does not exist within the group 4531 */ 4532 public View getChildAt(int index) { 4533 if (index < 0 || index >= mChildrenCount) { 4534 return null; 4535 } 4536 return mChildren[index]; 4537 } 4538 4539 /** 4540 * Ask all of the children of this view to measure themselves, taking into 4541 * account both the MeasureSpec requirements for this view and its padding. 4542 * We skip children that are in the GONE state The heavy lifting is done in 4543 * getChildMeasureSpec. 4544 * 4545 * @param widthMeasureSpec The width requirements for this view 4546 * @param heightMeasureSpec The height requirements for this view 4547 */ 4548 protected void measureChildren(int widthMeasureSpec, int heightMeasureSpec) { 4549 final int size = mChildrenCount; 4550 final View[] children = mChildren; 4551 for (int i = 0; i < size; ++i) { 4552 final View child = children[i]; 4553 if ((child.mViewFlags & VISIBILITY_MASK) != GONE) { 4554 measureChild(child, widthMeasureSpec, heightMeasureSpec); 4555 } 4556 } 4557 } 4558 4559 /** 4560 * Ask one of the children of this view to measure itself, taking into 4561 * account both the MeasureSpec requirements for this view and its padding. 4562 * The heavy lifting is done in getChildMeasureSpec. 4563 * 4564 * @param child The child to measure 4565 * @param parentWidthMeasureSpec The width requirements for this view 4566 * @param parentHeightMeasureSpec The height requirements for this view 4567 */ 4568 protected void measureChild(View child, int parentWidthMeasureSpec, 4569 int parentHeightMeasureSpec) { 4570 final LayoutParams lp = child.getLayoutParams(); 4571 4572 final int childWidthMeasureSpec = getChildMeasureSpec(parentWidthMeasureSpec, 4573 mPaddingLeft + mPaddingRight, lp.width); 4574 final int childHeightMeasureSpec = getChildMeasureSpec(parentHeightMeasureSpec, 4575 mPaddingTop + mPaddingBottom, lp.height); 4576 4577 child.measure(childWidthMeasureSpec, childHeightMeasureSpec); 4578 } 4579 4580 /** 4581 * Ask one of the children of this view to measure itself, taking into 4582 * account both the MeasureSpec requirements for this view and its padding 4583 * and margins. The child must have MarginLayoutParams The heavy lifting is 4584 * done in getChildMeasureSpec. 4585 * 4586 * @param child The child to measure 4587 * @param parentWidthMeasureSpec The width requirements for this view 4588 * @param widthUsed Extra space that has been used up by the parent 4589 * horizontally (possibly by other children of the parent) 4590 * @param parentHeightMeasureSpec The height requirements for this view 4591 * @param heightUsed Extra space that has been used up by the parent 4592 * vertically (possibly by other children of the parent) 4593 */ 4594 protected void measureChildWithMargins(View child, 4595 int parentWidthMeasureSpec, int widthUsed, 4596 int parentHeightMeasureSpec, int heightUsed) { 4597 final MarginLayoutParams lp = (MarginLayoutParams) child.getLayoutParams(); 4598 4599 final int childWidthMeasureSpec = getChildMeasureSpec(parentWidthMeasureSpec, 4600 mPaddingLeft + mPaddingRight + lp.leftMargin + lp.rightMargin 4601 + widthUsed, lp.width); 4602 final int childHeightMeasureSpec = getChildMeasureSpec(parentHeightMeasureSpec, 4603 mPaddingTop + mPaddingBottom + lp.topMargin + lp.bottomMargin 4604 + heightUsed, lp.height); 4605 4606 child.measure(childWidthMeasureSpec, childHeightMeasureSpec); 4607 } 4608 4609 /** 4610 * Does the hard part of measureChildren: figuring out the MeasureSpec to 4611 * pass to a particular child. This method figures out the right MeasureSpec 4612 * for one dimension (height or width) of one child view. 4613 * 4614 * The goal is to combine information from our MeasureSpec with the 4615 * LayoutParams of the child to get the best possible results. For example, 4616 * if the this view knows its size (because its MeasureSpec has a mode of 4617 * EXACTLY), and the child has indicated in its LayoutParams that it wants 4618 * to be the same size as the parent, the parent should ask the child to 4619 * layout given an exact size. 4620 * 4621 * @param spec The requirements for this view 4622 * @param padding The padding of this view for the current dimension and 4623 * margins, if applicable 4624 * @param childDimension How big the child wants to be in the current 4625 * dimension 4626 * @return a MeasureSpec integer for the child 4627 */ 4628 public static int getChildMeasureSpec(int spec, int padding, int childDimension) { 4629 int specMode = MeasureSpec.getMode(spec); 4630 int specSize = MeasureSpec.getSize(spec); 4631 4632 int size = Math.max(0, specSize - padding); 4633 4634 int resultSize = 0; 4635 int resultMode = 0; 4636 4637 switch (specMode) { 4638 // Parent has imposed an exact size on us 4639 case MeasureSpec.EXACTLY: 4640 if (childDimension >= 0) { 4641 resultSize = childDimension; 4642 resultMode = MeasureSpec.EXACTLY; 4643 } else if (childDimension == LayoutParams.MATCH_PARENT) { 4644 // Child wants to be our size. So be it. 4645 resultSize = size; 4646 resultMode = MeasureSpec.EXACTLY; 4647 } else if (childDimension == LayoutParams.WRAP_CONTENT) { 4648 // Child wants to determine its own size. It can't be 4649 // bigger than us. 4650 resultSize = size; 4651 resultMode = MeasureSpec.AT_MOST; 4652 } 4653 break; 4654 4655 // Parent has imposed a maximum size on us 4656 case MeasureSpec.AT_MOST: 4657 if (childDimension >= 0) { 4658 // Child wants a specific size... so be it 4659 resultSize = childDimension; 4660 resultMode = MeasureSpec.EXACTLY; 4661 } else if (childDimension == LayoutParams.MATCH_PARENT) { 4662 // Child wants to be our size, but our size is not fixed. 4663 // Constrain child to not be bigger than us. 4664 resultSize = size; 4665 resultMode = MeasureSpec.AT_MOST; 4666 } else if (childDimension == LayoutParams.WRAP_CONTENT) { 4667 // Child wants to determine its own size. It can't be 4668 // bigger than us. 4669 resultSize = size; 4670 resultMode = MeasureSpec.AT_MOST; 4671 } 4672 break; 4673 4674 // Parent asked to see how big we want to be 4675 case MeasureSpec.UNSPECIFIED: 4676 if (childDimension >= 0) { 4677 // Child wants a specific size... let him have it 4678 resultSize = childDimension; 4679 resultMode = MeasureSpec.EXACTLY; 4680 } else if (childDimension == LayoutParams.MATCH_PARENT) { 4681 // Child wants to be our size... find out how big it should 4682 // be 4683 resultSize = 0; 4684 resultMode = MeasureSpec.UNSPECIFIED; 4685 } else if (childDimension == LayoutParams.WRAP_CONTENT) { 4686 // Child wants to determine its own size.... find out how 4687 // big it should be 4688 resultSize = 0; 4689 resultMode = MeasureSpec.UNSPECIFIED; 4690 } 4691 break; 4692 } 4693 return MeasureSpec.makeMeasureSpec(resultSize, resultMode); 4694 } 4695 4696 4697 /** 4698 * Removes any pending animations for views that have been removed. Call 4699 * this if you don't want animations for exiting views to stack up. 4700 */ 4701 public void clearDisappearingChildren() { 4702 if (mDisappearingChildren != null) { 4703 mDisappearingChildren.clear(); 4704 invalidate(); 4705 } 4706 } 4707 4708 /** 4709 * Add a view which is removed from mChildren but still needs animation 4710 * 4711 * @param v View to add 4712 */ 4713 private void addDisappearingView(View v) { 4714 ArrayList<View> disappearingChildren = mDisappearingChildren; 4715 4716 if (disappearingChildren == null) { 4717 disappearingChildren = mDisappearingChildren = new ArrayList<View>(); 4718 } 4719 4720 disappearingChildren.add(v); 4721 } 4722 4723 /** 4724 * Cleanup a view when its animation is done. This may mean removing it from 4725 * the list of disappearing views. 4726 * 4727 * @param view The view whose animation has finished 4728 * @param animation The animation, cannot be null 4729 */ 4730 void finishAnimatingView(final View view, Animation animation) { 4731 final ArrayList<View> disappearingChildren = mDisappearingChildren; 4732 if (disappearingChildren != null) { 4733 if (disappearingChildren.contains(view)) { 4734 disappearingChildren.remove(view); 4735 4736 if (view.mAttachInfo != null) { 4737 view.dispatchDetachedFromWindow(); 4738 } 4739 4740 view.clearAnimation(); 4741 mGroupFlags |= FLAG_INVALIDATE_REQUIRED; 4742 } 4743 } 4744 4745 if (animation != null && !animation.getFillAfter()) { 4746 view.clearAnimation(); 4747 } 4748 4749 if ((view.mPrivateFlags & ANIMATION_STARTED) == ANIMATION_STARTED) { 4750 view.onAnimationEnd(); 4751 // Should be performed by onAnimationEnd() but this avoid an infinite loop, 4752 // so we'd rather be safe than sorry 4753 view.mPrivateFlags &= ~ANIMATION_STARTED; 4754 // Draw one more frame after the animation is done 4755 mGroupFlags |= FLAG_INVALIDATE_REQUIRED; 4756 } 4757 } 4758 4759 /** 4760 * Utility function called by View during invalidation to determine whether a view that 4761 * is invisible or gone should still be invalidated because it is being transitioned (and 4762 * therefore still needs to be drawn). 4763 */ 4764 boolean isViewTransitioning(View view) { 4765 return (mTransitioningViews != null && mTransitioningViews.contains(view)); 4766 } 4767 4768 /** 4769 * This method tells the ViewGroup that the given View object, which should have this 4770 * ViewGroup as its parent, 4771 * should be kept around (re-displayed when the ViewGroup draws its children) even if it 4772 * is removed from its parent. This allows animations, such as those used by 4773 * {@link android.app.Fragment} and {@link android.animation.LayoutTransition} to animate 4774 * the removal of views. A call to this method should always be accompanied by a later call 4775 * to {@link #endViewTransition(View)}, such as after an animation on the View has finished, 4776 * so that the View finally gets removed. 4777 * 4778 * @param view The View object to be kept visible even if it gets removed from its parent. 4779 */ 4780 public void startViewTransition(View view) { 4781 if (view.mParent == this) { 4782 if (mTransitioningViews == null) { 4783 mTransitioningViews = new ArrayList<View>(); 4784 } 4785 mTransitioningViews.add(view); 4786 } 4787 } 4788 4789 /** 4790 * This method should always be called following an earlier call to 4791 * {@link #startViewTransition(View)}. The given View is finally removed from its parent 4792 * and will no longer be displayed. Note that this method does not perform the functionality 4793 * of removing a view from its parent; it just discontinues the display of a View that 4794 * has previously been removed. 4795 * 4796 * @return view The View object that has been removed but is being kept around in the visible 4797 * hierarchy by an earlier call to {@link #startViewTransition(View)}. 4798 */ 4799 public void endViewTransition(View view) { 4800 if (mTransitioningViews != null) { 4801 mTransitioningViews.remove(view); 4802 final ArrayList<View> disappearingChildren = mDisappearingChildren; 4803 if (disappearingChildren != null && disappearingChildren.contains(view)) { 4804 disappearingChildren.remove(view); 4805 if (mVisibilityChangingChildren != null && 4806 mVisibilityChangingChildren.contains(view)) { 4807 mVisibilityChangingChildren.remove(view); 4808 } else { 4809 if (view.mAttachInfo != null) { 4810 view.dispatchDetachedFromWindow(); 4811 } 4812 if (view.mParent != null) { 4813 view.mParent = null; 4814 } 4815 } 4816 invalidate(); 4817 } 4818 } 4819 } 4820 4821 private LayoutTransition.TransitionListener mLayoutTransitionListener = 4822 new LayoutTransition.TransitionListener() { 4823 @Override 4824 public void startTransition(LayoutTransition transition, ViewGroup container, 4825 View view, int transitionType) { 4826 // We only care about disappearing items, since we need special logic to keep 4827 // those items visible after they've been 'removed' 4828 if (transitionType == LayoutTransition.DISAPPEARING) { 4829 startViewTransition(view); 4830 } 4831 } 4832 4833 @Override 4834 public void endTransition(LayoutTransition transition, ViewGroup container, 4835 View view, int transitionType) { 4836 if (mLayoutSuppressed && !transition.isChangingLayout()) { 4837 requestLayout(); 4838 mLayoutSuppressed = false; 4839 } 4840 if (transitionType == LayoutTransition.DISAPPEARING && mTransitioningViews != null) { 4841 endViewTransition(view); 4842 } 4843 } 4844 }; 4845 4846 /** 4847 * {@inheritDoc} 4848 */ 4849 @Override 4850 public boolean gatherTransparentRegion(Region region) { 4851 // If no transparent regions requested, we are always opaque. 4852 final boolean meOpaque = (mPrivateFlags & View.REQUEST_TRANSPARENT_REGIONS) == 0; 4853 if (meOpaque && region == null) { 4854 // The caller doesn't care about the region, so stop now. 4855 return true; 4856 } 4857 super.gatherTransparentRegion(region); 4858 final View[] children = mChildren; 4859 final int count = mChildrenCount; 4860 boolean noneOfTheChildrenAreTransparent = true; 4861 for (int i = 0; i < count; i++) { 4862 final View child = children[i]; 4863 if ((child.mViewFlags & VISIBILITY_MASK) == VISIBLE || child.getAnimation() != null) { 4864 if (!child.gatherTransparentRegion(region)) { 4865 noneOfTheChildrenAreTransparent = false; 4866 } 4867 } 4868 } 4869 return meOpaque || noneOfTheChildrenAreTransparent; 4870 } 4871 4872 /** 4873 * {@inheritDoc} 4874 */ 4875 public void requestTransparentRegion(View child) { 4876 if (child != null) { 4877 child.mPrivateFlags |= View.REQUEST_TRANSPARENT_REGIONS; 4878 if (mParent != null) { 4879 mParent.requestTransparentRegion(this); 4880 } 4881 } 4882 } 4883 4884 4885 @Override 4886 protected boolean fitSystemWindows(Rect insets) { 4887 boolean done = super.fitSystemWindows(insets); 4888 if (!done) { 4889 final int count = mChildrenCount; 4890 final View[] children = mChildren; 4891 for (int i = 0; i < count; i++) { 4892 done = children[i].fitSystemWindows(insets); 4893 if (done) { 4894 break; 4895 } 4896 } 4897 } 4898 return done; 4899 } 4900 4901 /** 4902 * Returns the animation listener to which layout animation events are 4903 * sent. 4904 * 4905 * @return an {@link android.view.animation.Animation.AnimationListener} 4906 */ 4907 public Animation.AnimationListener getLayoutAnimationListener() { 4908 return mAnimationListener; 4909 } 4910 4911 @Override 4912 protected void drawableStateChanged() { 4913 super.drawableStateChanged(); 4914 4915 if ((mGroupFlags & FLAG_NOTIFY_CHILDREN_ON_DRAWABLE_STATE_CHANGE) != 0) { 4916 if ((mGroupFlags & FLAG_ADD_STATES_FROM_CHILDREN) != 0) { 4917 throw new IllegalStateException("addStateFromChildren cannot be enabled if a" 4918 + " child has duplicateParentState set to true"); 4919 } 4920 4921 final View[] children = mChildren; 4922 final int count = mChildrenCount; 4923 4924 for (int i = 0; i < count; i++) { 4925 final View child = children[i]; 4926 if ((child.mViewFlags & DUPLICATE_PARENT_STATE) != 0) { 4927 child.refreshDrawableState(); 4928 } 4929 } 4930 } 4931 } 4932 4933 @Override 4934 public void jumpDrawablesToCurrentState() { 4935 super.jumpDrawablesToCurrentState(); 4936 final View[] children = mChildren; 4937 final int count = mChildrenCount; 4938 for (int i = 0; i < count; i++) { 4939 children[i].jumpDrawablesToCurrentState(); 4940 } 4941 } 4942 4943 @Override 4944 protected int[] onCreateDrawableState(int extraSpace) { 4945 if ((mGroupFlags & FLAG_ADD_STATES_FROM_CHILDREN) == 0) { 4946 return super.onCreateDrawableState(extraSpace); 4947 } 4948 4949 int need = 0; 4950 int n = getChildCount(); 4951 for (int i = 0; i < n; i++) { 4952 int[] childState = getChildAt(i).getDrawableState(); 4953 4954 if (childState != null) { 4955 need += childState.length; 4956 } 4957 } 4958 4959 int[] state = super.onCreateDrawableState(extraSpace + need); 4960 4961 for (int i = 0; i < n; i++) { 4962 int[] childState = getChildAt(i).getDrawableState(); 4963 4964 if (childState != null) { 4965 state = mergeDrawableStates(state, childState); 4966 } 4967 } 4968 4969 return state; 4970 } 4971 4972 /** 4973 * Sets whether this ViewGroup's drawable states also include 4974 * its children's drawable states. This is used, for example, to 4975 * make a group appear to be focused when its child EditText or button 4976 * is focused. 4977 */ 4978 public void setAddStatesFromChildren(boolean addsStates) { 4979 if (addsStates) { 4980 mGroupFlags |= FLAG_ADD_STATES_FROM_CHILDREN; 4981 } else { 4982 mGroupFlags &= ~FLAG_ADD_STATES_FROM_CHILDREN; 4983 } 4984 4985 refreshDrawableState(); 4986 } 4987 4988 /** 4989 * Returns whether this ViewGroup's drawable states also include 4990 * its children's drawable states. This is used, for example, to 4991 * make a group appear to be focused when its child EditText or button 4992 * is focused. 4993 */ 4994 public boolean addStatesFromChildren() { 4995 return (mGroupFlags & FLAG_ADD_STATES_FROM_CHILDREN) != 0; 4996 } 4997 4998 /** 4999 * If {link #addStatesFromChildren} is true, refreshes this group's 5000 * drawable state (to include the states from its children). 5001 */ 5002 public void childDrawableStateChanged(View child) { 5003 if ((mGroupFlags & FLAG_ADD_STATES_FROM_CHILDREN) != 0) { 5004 refreshDrawableState(); 5005 } 5006 } 5007 5008 /** 5009 * Specifies the animation listener to which layout animation events must 5010 * be sent. Only 5011 * {@link android.view.animation.Animation.AnimationListener#onAnimationStart(Animation)} 5012 * and 5013 * {@link android.view.animation.Animation.AnimationListener#onAnimationEnd(Animation)} 5014 * are invoked. 5015 * 5016 * @param animationListener the layout animation listener 5017 */ 5018 public void setLayoutAnimationListener(Animation.AnimationListener animationListener) { 5019 mAnimationListener = animationListener; 5020 } 5021 5022 /** 5023 * This method is called by LayoutTransition when there are 'changing' animations that need 5024 * to start after the layout/setup phase. The request is forwarded to the ViewAncestor, who 5025 * starts all pending transitions prior to the drawing phase in the current traversal. 5026 * 5027 * @param transition The LayoutTransition to be started on the next traversal. 5028 * 5029 * @hide 5030 */ 5031 public void requestTransitionStart(LayoutTransition transition) { 5032 ViewRootImpl viewAncestor = getViewRootImpl(); 5033 if (viewAncestor != null) { 5034 viewAncestor.requestTransitionStart(transition); 5035 } 5036 } 5037 5038 @Override 5039 public void onResolvedLayoutDirectionReset() { 5040 // Take care of resetting the children resolution too 5041 final int count = getChildCount(); 5042 for (int i = 0; i < count; i++) { 5043 final View child = getChildAt(i); 5044 if (child.getLayoutDirection() == LAYOUT_DIRECTION_INHERIT) { 5045 child.resetResolvedLayoutDirection(); 5046 } 5047 } 5048 } 5049 5050 @Override 5051 public void onResolvedTextDirectionReset() { 5052 // Take care of resetting the children resolution too 5053 final int count = getChildCount(); 5054 for (int i = 0; i < count; i++) { 5055 final View child = getChildAt(i); 5056 if (child.getTextDirection() == TEXT_DIRECTION_INHERIT) { 5057 child.resetResolvedTextDirection(); 5058 } 5059 } 5060 } 5061 5062 @Override 5063 public void onResolvedTextAlignmentReset() { 5064 // Take care of resetting the children resolution too 5065 final int count = getChildCount(); 5066 for (int i = 0; i < count; i++) { 5067 final View child = getChildAt(i); 5068 if (child.getTextAlignment() == TEXT_ALIGNMENT_INHERIT) { 5069 child.resetResolvedTextAlignment(); 5070 } 5071 } 5072 } 5073 5074 /** 5075 * Return true if the pressed state should be delayed for children or descendants of this 5076 * ViewGroup. Generally, this should be done for containers that can scroll, such as a List. 5077 * This prevents the pressed state from appearing when the user is actually trying to scroll 5078 * the content. 5079 * 5080 * The default implementation returns true for compatibility reasons. Subclasses that do 5081 * not scroll should generally override this method and return false. 5082 */ 5083 public boolean shouldDelayChildPressedState() { 5084 return true; 5085 } 5086 5087 /** @hide */ 5088 protected void onSetLayoutParams(View child, LayoutParams layoutParams) { 5089 } 5090 5091 /** 5092 * LayoutParams are used by views to tell their parents how they want to be 5093 * laid out. See 5094 * {@link android.R.styleable#ViewGroup_Layout ViewGroup Layout Attributes} 5095 * for a list of all child view attributes that this class supports. 5096 * 5097 * <p> 5098 * The base LayoutParams class just describes how big the view wants to be 5099 * for both width and height. For each dimension, it can specify one of: 5100 * <ul> 5101 * <li>FILL_PARENT (renamed MATCH_PARENT in API Level 8 and higher), which 5102 * means that the view wants to be as big as its parent (minus padding) 5103 * <li> WRAP_CONTENT, which means that the view wants to be just big enough 5104 * to enclose its content (plus padding) 5105 * <li> an exact number 5106 * </ul> 5107 * There are subclasses of LayoutParams for different subclasses of 5108 * ViewGroup. For example, AbsoluteLayout has its own subclass of 5109 * LayoutParams which adds an X and Y value.</p> 5110 * 5111 * <div class="special reference"> 5112 * <h3>Developer Guides</h3> 5113 * <p>For more information about creating user interface layouts, read the 5114 * <a href="{@docRoot}guide/topics/ui/declaring-layout.html">XML Layouts</a> developer 5115 * guide.</p></div> 5116 * 5117 * @attr ref android.R.styleable#ViewGroup_Layout_layout_height 5118 * @attr ref android.R.styleable#ViewGroup_Layout_layout_width 5119 */ 5120 public static class LayoutParams { 5121 /** 5122 * Special value for the height or width requested by a View. 5123 * FILL_PARENT means that the view wants to be as big as its parent, 5124 * minus the parent's padding, if any. This value is deprecated 5125 * starting in API Level 8 and replaced by {@link #MATCH_PARENT}. 5126 */ 5127 @SuppressWarnings({"UnusedDeclaration"}) 5128 @Deprecated 5129 public static final int FILL_PARENT = -1; 5130 5131 /** 5132 * Special value for the height or width requested by a View. 5133 * MATCH_PARENT means that the view wants to be as big as its parent, 5134 * minus the parent's padding, if any. Introduced in API Level 8. 5135 */ 5136 public static final int MATCH_PARENT = -1; 5137 5138 /** 5139 * Special value for the height or width requested by a View. 5140 * WRAP_CONTENT means that the view wants to be just large enough to fit 5141 * its own internal content, taking its own padding into account. 5142 */ 5143 public static final int WRAP_CONTENT = -2; 5144 5145 /** 5146 * Information about how wide the view wants to be. Can be one of the 5147 * constants FILL_PARENT (replaced by MATCH_PARENT , 5148 * in API Level 8) or WRAP_CONTENT. or an exact size. 5149 */ 5150 @ViewDebug.ExportedProperty(category = "layout", mapping = { 5151 @ViewDebug.IntToString(from = MATCH_PARENT, to = "MATCH_PARENT"), 5152 @ViewDebug.IntToString(from = WRAP_CONTENT, to = "WRAP_CONTENT") 5153 }) 5154 public int width; 5155 5156 /** 5157 * Information about how tall the view wants to be. Can be one of the 5158 * constants FILL_PARENT (replaced by MATCH_PARENT , 5159 * in API Level 8) or WRAP_CONTENT. or an exact size. 5160 */ 5161 @ViewDebug.ExportedProperty(category = "layout", mapping = { 5162 @ViewDebug.IntToString(from = MATCH_PARENT, to = "MATCH_PARENT"), 5163 @ViewDebug.IntToString(from = WRAP_CONTENT, to = "WRAP_CONTENT") 5164 }) 5165 public int height; 5166 5167 /** 5168 * Used to animate layouts. 5169 */ 5170 public LayoutAnimationController.AnimationParameters layoutAnimationParameters; 5171 5172 /** 5173 * Creates a new set of layout parameters. The values are extracted from 5174 * the supplied attributes set and context. The XML attributes mapped 5175 * to this set of layout parameters are: 5176 * 5177 * <ul> 5178 * <li><code>layout_width</code>: the width, either an exact value, 5179 * {@link #WRAP_CONTENT}, or {@link #FILL_PARENT} (replaced by 5180 * {@link #MATCH_PARENT} in API Level 8)</li> 5181 * <li><code>layout_height</code>: the height, either an exact value, 5182 * {@link #WRAP_CONTENT}, or {@link #FILL_PARENT} (replaced by 5183 * {@link #MATCH_PARENT} in API Level 8)</li> 5184 * </ul> 5185 * 5186 * @param c the application environment 5187 * @param attrs the set of attributes from which to extract the layout 5188 * parameters' values 5189 */ 5190 public LayoutParams(Context c, AttributeSet attrs) { 5191 TypedArray a = c.obtainStyledAttributes(attrs, R.styleable.ViewGroup_Layout); 5192 setBaseAttributes(a, 5193 R.styleable.ViewGroup_Layout_layout_width, 5194 R.styleable.ViewGroup_Layout_layout_height); 5195 a.recycle(); 5196 } 5197 5198 /** 5199 * Creates a new set of layout parameters with the specified width 5200 * and height. 5201 * 5202 * @param width the width, either {@link #WRAP_CONTENT}, 5203 * {@link #FILL_PARENT} (replaced by {@link #MATCH_PARENT} in 5204 * API Level 8), or a fixed size in pixels 5205 * @param height the height, either {@link #WRAP_CONTENT}, 5206 * {@link #FILL_PARENT} (replaced by {@link #MATCH_PARENT} in 5207 * API Level 8), or a fixed size in pixels 5208 */ 5209 public LayoutParams(int width, int height) { 5210 this.width = width; 5211 this.height = height; 5212 } 5213 5214 /** 5215 * Copy constructor. Clones the width and height values of the source. 5216 * 5217 * @param source The layout params to copy from. 5218 */ 5219 public LayoutParams(LayoutParams source) { 5220 this.width = source.width; 5221 this.height = source.height; 5222 } 5223 5224 /** 5225 * Used internally by MarginLayoutParams. 5226 * @hide 5227 */ 5228 LayoutParams() { 5229 } 5230 5231 /** 5232 * Extracts the layout parameters from the supplied attributes. 5233 * 5234 * @param a the style attributes to extract the parameters from 5235 * @param widthAttr the identifier of the width attribute 5236 * @param heightAttr the identifier of the height attribute 5237 */ 5238 protected void setBaseAttributes(TypedArray a, int widthAttr, int heightAttr) { 5239 width = a.getLayoutDimension(widthAttr, "layout_width"); 5240 height = a.getLayoutDimension(heightAttr, "layout_height"); 5241 } 5242 5243 /** 5244 * Resolve layout parameters depending on the layout direction. Subclasses that care about 5245 * layoutDirection changes should override this method. The default implementation does 5246 * nothing. 5247 * 5248 * @param layoutDirection the direction of the layout 5249 * 5250 * {@link View#LAYOUT_DIRECTION_LTR} 5251 * {@link View#LAYOUT_DIRECTION_RTL} 5252 */ 5253 public void onResolveLayoutDirection(int layoutDirection) { 5254 } 5255 5256 /** 5257 * Returns a String representation of this set of layout parameters. 5258 * 5259 * @param output the String to prepend to the internal representation 5260 * @return a String with the following format: output + 5261 * "ViewGroup.LayoutParams={ width=WIDTH, height=HEIGHT }" 5262 * 5263 * @hide 5264 */ 5265 public String debug(String output) { 5266 return output + "ViewGroup.LayoutParams={ width=" 5267 + sizeToString(width) + ", height=" + sizeToString(height) + " }"; 5268 } 5269 5270 /** 5271 * Converts the specified size to a readable String. 5272 * 5273 * @param size the size to convert 5274 * @return a String instance representing the supplied size 5275 * 5276 * @hide 5277 */ 5278 protected static String sizeToString(int size) { 5279 if (size == WRAP_CONTENT) { 5280 return "wrap-content"; 5281 } 5282 if (size == MATCH_PARENT) { 5283 return "match-parent"; 5284 } 5285 return String.valueOf(size); 5286 } 5287 } 5288 5289 /** 5290 * Per-child layout information for layouts that support margins. 5291 * See 5292 * {@link android.R.styleable#ViewGroup_MarginLayout ViewGroup Margin Layout Attributes} 5293 * for a list of all child view attributes that this class supports. 5294 */ 5295 public static class MarginLayoutParams extends ViewGroup.LayoutParams { 5296 /** 5297 * The left margin in pixels of the child. 5298 * Call {@link ViewGroup#setLayoutParams(LayoutParams)} after reassigning a new value 5299 * to this field. 5300 */ 5301 @ViewDebug.ExportedProperty(category = "layout") 5302 public int leftMargin; 5303 5304 /** 5305 * The top margin in pixels of the child. 5306 * Call {@link ViewGroup#setLayoutParams(LayoutParams)} after reassigning a new value 5307 * to this field. 5308 */ 5309 @ViewDebug.ExportedProperty(category = "layout") 5310 public int topMargin; 5311 5312 /** 5313 * The right margin in pixels of the child. 5314 * Call {@link ViewGroup#setLayoutParams(LayoutParams)} after reassigning a new value 5315 * to this field. 5316 */ 5317 @ViewDebug.ExportedProperty(category = "layout") 5318 public int rightMargin; 5319 5320 /** 5321 * The bottom margin in pixels of the child. 5322 * Call {@link ViewGroup#setLayoutParams(LayoutParams)} after reassigning a new value 5323 * to this field. 5324 */ 5325 @ViewDebug.ExportedProperty(category = "layout") 5326 public int bottomMargin; 5327 5328 /** 5329 * The start margin in pixels of the child. 5330 * Call {@link ViewGroup#setLayoutParams(LayoutParams)} after reassigning a new value 5331 * to this field. 5332 */ 5333 @ViewDebug.ExportedProperty(category = "layout") 5334 public int startMargin = DEFAULT_RELATIVE; 5335 5336 /** 5337 * The end margin in pixels of the child. 5338 * Call {@link ViewGroup#setLayoutParams(LayoutParams)} after reassigning a new value 5339 * to this field. 5340 */ 5341 @ViewDebug.ExportedProperty(category = "layout") 5342 public int endMargin = DEFAULT_RELATIVE; 5343 5344 /** 5345 * The default start and end margin. 5346 */ 5347 static private final int DEFAULT_RELATIVE = Integer.MIN_VALUE; 5348 5349 /** 5350 * Creates a new set of layout parameters. The values are extracted from 5351 * the supplied attributes set and context. 5352 * 5353 * @param c the application environment 5354 * @param attrs the set of attributes from which to extract the layout 5355 * parameters' values 5356 */ 5357 public MarginLayoutParams(Context c, AttributeSet attrs) { 5358 super(); 5359 5360 TypedArray a = c.obtainStyledAttributes(attrs, R.styleable.ViewGroup_MarginLayout); 5361 setBaseAttributes(a, 5362 R.styleable.ViewGroup_MarginLayout_layout_width, 5363 R.styleable.ViewGroup_MarginLayout_layout_height); 5364 5365 int margin = a.getDimensionPixelSize( 5366 com.android.internal.R.styleable.ViewGroup_MarginLayout_layout_margin, -1); 5367 if (margin >= 0) { 5368 leftMargin = margin; 5369 topMargin = margin; 5370 rightMargin= margin; 5371 bottomMargin = margin; 5372 } else { 5373 leftMargin = a.getDimensionPixelSize( 5374 R.styleable.ViewGroup_MarginLayout_layout_marginLeft, 0); 5375 topMargin = a.getDimensionPixelSize( 5376 R.styleable.ViewGroup_MarginLayout_layout_marginTop, 0); 5377 rightMargin = a.getDimensionPixelSize( 5378 R.styleable.ViewGroup_MarginLayout_layout_marginRight, 0); 5379 bottomMargin = a.getDimensionPixelSize( 5380 R.styleable.ViewGroup_MarginLayout_layout_marginBottom, 0); 5381 startMargin = a.getDimensionPixelSize( 5382 R.styleable.ViewGroup_MarginLayout_layout_marginStart, DEFAULT_RELATIVE); 5383 endMargin = a.getDimensionPixelSize( 5384 R.styleable.ViewGroup_MarginLayout_layout_marginEnd, DEFAULT_RELATIVE); 5385 } 5386 5387 a.recycle(); 5388 } 5389 5390 /** 5391 * {@inheritDoc} 5392 */ 5393 public MarginLayoutParams(int width, int height) { 5394 super(width, height); 5395 } 5396 5397 /** 5398 * Copy constructor. Clones the width, height and margin values of the source. 5399 * 5400 * @param source The layout params to copy from. 5401 */ 5402 public MarginLayoutParams(MarginLayoutParams source) { 5403 this.width = source.width; 5404 this.height = source.height; 5405 5406 this.leftMargin = source.leftMargin; 5407 this.topMargin = source.topMargin; 5408 this.rightMargin = source.rightMargin; 5409 this.bottomMargin = source.bottomMargin; 5410 this.startMargin = source.startMargin; 5411 this.endMargin = source.endMargin; 5412 } 5413 5414 /** 5415 * {@inheritDoc} 5416 */ 5417 public MarginLayoutParams(LayoutParams source) { 5418 super(source); 5419 } 5420 5421 /** 5422 * Sets the margins, in pixels. A call to {@link android.view.View#requestLayout()} needs 5423 * to be done so that the new margins are taken into account. Left and right margins may be 5424 * overriden by {@link android.view.View#requestLayout()} depending on layout direction. 5425 * 5426 * @param left the left margin size 5427 * @param top the top margin size 5428 * @param right the right margin size 5429 * @param bottom the bottom margin size 5430 * 5431 * @attr ref android.R.styleable#ViewGroup_MarginLayout_layout_marginLeft 5432 * @attr ref android.R.styleable#ViewGroup_MarginLayout_layout_marginTop 5433 * @attr ref android.R.styleable#ViewGroup_MarginLayout_layout_marginRight 5434 * @attr ref android.R.styleable#ViewGroup_MarginLayout_layout_marginBottom 5435 */ 5436 public void setMargins(int left, int top, int right, int bottom) { 5437 leftMargin = left; 5438 topMargin = top; 5439 rightMargin = right; 5440 bottomMargin = bottom; 5441 } 5442 5443 /** 5444 * Sets the relative margins, in pixels. A call to {@link android.view.View#requestLayout()} 5445 * needs to be done so that the new relative margins are taken into account. Left and right 5446 * margins may be overriden by {@link android.view.View#requestLayout()} depending on layout 5447 * direction. 5448 * 5449 * @param start the start margin size 5450 * @param top the top margin size 5451 * @param end the right margin size 5452 * @param bottom the bottom margin size 5453 * 5454 * @attr ref android.R.styleable#ViewGroup_MarginLayout_layout_marginStart 5455 * @attr ref android.R.styleable#ViewGroup_MarginLayout_layout_marginTop 5456 * @attr ref android.R.styleable#ViewGroup_MarginLayout_layout_marginEnd 5457 * @attr ref android.R.styleable#ViewGroup_MarginLayout_layout_marginBottom 5458 * 5459 * @hide 5460 */ 5461 public void setMarginsRelative(int start, int top, int end, int bottom) { 5462 startMargin = start; 5463 topMargin = top; 5464 endMargin = end; 5465 bottomMargin = bottom; 5466 } 5467 5468 /** 5469 * Returns the start margin in pixels. 5470 * 5471 * @attr ref android.R.styleable#ViewGroup_MarginLayout_layout_marginStart 5472 * 5473 * @return the start margin in pixels. 5474 */ 5475 public int getMarginStart() { 5476 return startMargin; 5477 } 5478 5479 /** 5480 * Returns the end margin in pixels. 5481 * 5482 * @attr ref android.R.styleable#ViewGroup_MarginLayout_layout_marginEnd 5483 * 5484 * @return the end margin in pixels. 5485 */ 5486 public int getMarginEnd() { 5487 return endMargin; 5488 } 5489 5490 /** 5491 * Check if margins are relative. 5492 * 5493 * @attr ref android.R.styleable#ViewGroup_MarginLayout_layout_marginStart 5494 * @attr ref android.R.styleable#ViewGroup_MarginLayout_layout_marginEnd 5495 * 5496 * @return true if either marginStart or marginEnd has been set 5497 */ 5498 public boolean isMarginRelative() { 5499 return (startMargin != DEFAULT_RELATIVE) || (endMargin != DEFAULT_RELATIVE); 5500 } 5501 5502 /** 5503 * This will be called by {@link android.view.View#requestLayout()}. Left and Right margins 5504 * may be overridden depending on layout direction. 5505 */ 5506 @Override 5507 public void onResolveLayoutDirection(int layoutDirection) { 5508 switch(layoutDirection) { 5509 case View.LAYOUT_DIRECTION_RTL: 5510 leftMargin = (endMargin > DEFAULT_RELATIVE) ? endMargin : leftMargin; 5511 rightMargin = (startMargin > DEFAULT_RELATIVE) ? startMargin : rightMargin; 5512 break; 5513 case View.LAYOUT_DIRECTION_LTR: 5514 default: 5515 leftMargin = (startMargin > DEFAULT_RELATIVE) ? startMargin : leftMargin; 5516 rightMargin = (endMargin > DEFAULT_RELATIVE) ? endMargin : rightMargin; 5517 break; 5518 } 5519 } 5520 } 5521 5522 /* Describes a touched view and the ids of the pointers that it has captured. 5523 * 5524 * This code assumes that pointer ids are always in the range 0..31 such that 5525 * it can use a bitfield to track which pointer ids are present. 5526 * As it happens, the lower layers of the input dispatch pipeline also use the 5527 * same trick so the assumption should be safe here... 5528 */ 5529 private static final class TouchTarget { 5530 private static final int MAX_RECYCLED = 32; 5531 private static final Object sRecycleLock = new Object(); 5532 private static TouchTarget sRecycleBin; 5533 private static int sRecycledCount; 5534 5535 public static final int ALL_POINTER_IDS = -1; // all ones 5536 5537 // The touched child view. 5538 public View child; 5539 5540 // The combined bit mask of pointer ids for all pointers captured by the target. 5541 public int pointerIdBits; 5542 5543 // The next target in the target list. 5544 public TouchTarget next; 5545 5546 private TouchTarget() { 5547 } 5548 5549 public static TouchTarget obtain(View child, int pointerIdBits) { 5550 final TouchTarget target; 5551 synchronized (sRecycleLock) { 5552 if (sRecycleBin == null) { 5553 target = new TouchTarget(); 5554 } else { 5555 target = sRecycleBin; 5556 sRecycleBin = target.next; 5557 sRecycledCount--; 5558 target.next = null; 5559 } 5560 } 5561 target.child = child; 5562 target.pointerIdBits = pointerIdBits; 5563 return target; 5564 } 5565 5566 public void recycle() { 5567 synchronized (sRecycleLock) { 5568 if (sRecycledCount < MAX_RECYCLED) { 5569 next = sRecycleBin; 5570 sRecycleBin = this; 5571 sRecycledCount += 1; 5572 } else { 5573 next = null; 5574 } 5575 child = null; 5576 } 5577 } 5578 } 5579 5580 /* Describes a hovered view. */ 5581 private static final class HoverTarget { 5582 private static final int MAX_RECYCLED = 32; 5583 private static final Object sRecycleLock = new Object(); 5584 private static HoverTarget sRecycleBin; 5585 private static int sRecycledCount; 5586 5587 // The hovered child view. 5588 public View child; 5589 5590 // The next target in the target list. 5591 public HoverTarget next; 5592 5593 private HoverTarget() { 5594 } 5595 5596 public static HoverTarget obtain(View child) { 5597 final HoverTarget target; 5598 synchronized (sRecycleLock) { 5599 if (sRecycleBin == null) { 5600 target = new HoverTarget(); 5601 } else { 5602 target = sRecycleBin; 5603 sRecycleBin = target.next; 5604 sRecycledCount--; 5605 target.next = null; 5606 } 5607 } 5608 target.child = child; 5609 return target; 5610 } 5611 5612 public void recycle() { 5613 synchronized (sRecycleLock) { 5614 if (sRecycledCount < MAX_RECYCLED) { 5615 next = sRecycleBin; 5616 sRecycleBin = this; 5617 sRecycledCount += 1; 5618 } else { 5619 next = null; 5620 } 5621 child = null; 5622 } 5623 } 5624 } 5625} 5626