ViewGroup.java revision 6e42470f928bbf60c9fd3d17a2a69a4b96cec170
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 81 private static final boolean DBG = false; 82 83 /** 84 * Views which have been hidden or removed which need to be animated on 85 * their way out. 86 * This field should be made private, so it is hidden from the SDK. 87 * {@hide} 88 */ 89 protected ArrayList<View> mDisappearingChildren; 90 91 /** 92 * Listener used to propagate events indicating when children are added 93 * and/or removed from a view group. 94 * This field should be made private, so it is hidden from the SDK. 95 * {@hide} 96 */ 97 protected OnHierarchyChangeListener mOnHierarchyChangeListener; 98 99 // The view contained within this ViewGroup that has or contains focus. 100 private View mFocused; 101 102 /** 103 * A Transformation used when drawing children, to 104 * apply on the child being drawn. 105 */ 106 private final Transformation mChildTransformation = new Transformation(); 107 108 /** 109 * Used to track the current invalidation region. 110 */ 111 private RectF mInvalidateRegion; 112 113 /** 114 * A Transformation used to calculate a correct 115 * invalidation area when the application is autoscaled. 116 */ 117 private Transformation mInvalidationTransformation; 118 119 // View currently under an ongoing drag 120 private View mCurrentDragView; 121 122 // Metadata about the ongoing drag 123 private DragEvent mCurrentDrag; 124 private HashSet<View> mDragNotifiedChildren; 125 126 // Does this group have a child that can accept the current drag payload? 127 private boolean mChildAcceptsDrag; 128 129 // Used during drag dispatch 130 private final PointF mLocalPoint = new PointF(); 131 132 // Layout animation 133 private LayoutAnimationController mLayoutAnimationController; 134 private Animation.AnimationListener mAnimationListener; 135 136 // First touch target in the linked list of touch targets. 137 private TouchTarget mFirstTouchTarget; 138 139 // For debugging only. You can see these in hierarchyviewer. 140 @SuppressWarnings({"FieldCanBeLocal", "UnusedDeclaration"}) 141 @ViewDebug.ExportedProperty(category = "events") 142 private long mLastTouchDownTime; 143 @ViewDebug.ExportedProperty(category = "events") 144 private int mLastTouchDownIndex = -1; 145 @SuppressWarnings({"FieldCanBeLocal", "UnusedDeclaration"}) 146 @ViewDebug.ExportedProperty(category = "events") 147 private float mLastTouchDownX; 148 @SuppressWarnings({"FieldCanBeLocal", "UnusedDeclaration"}) 149 @ViewDebug.ExportedProperty(category = "events") 150 private float mLastTouchDownY; 151 152 // First hover target in the linked list of hover targets. 153 // The hover targets are children which have received ACTION_HOVER_ENTER. 154 // They might not have actually handled the hover event, but we will 155 // continue sending hover events to them as long as the pointer remains over 156 // their bounds and the view group does not intercept hover. 157 private HoverTarget mFirstHoverTarget; 158 159 // True if the view group itself received a hover event. 160 // It might not have actually handled the hover event. 161 private boolean mHoveredSelf; 162 163 /** 164 * Internal flags. 165 * 166 * This field should be made private, so it is hidden from the SDK. 167 * {@hide} 168 */ 169 protected int mGroupFlags; 170 171 // When set, ViewGroup invalidates only the child's rectangle 172 // Set by default 173 private static final int FLAG_CLIP_CHILDREN = 0x1; 174 175 // When set, ViewGroup excludes the padding area from the invalidate rectangle 176 // Set by default 177 private static final int FLAG_CLIP_TO_PADDING = 0x2; 178 179 // When set, dispatchDraw() will invoke invalidate(); this is set by drawChild() when 180 // a child needs to be invalidated and FLAG_OPTIMIZE_INVALIDATE is set 181 private static final int FLAG_INVALIDATE_REQUIRED = 0x4; 182 183 // When set, dispatchDraw() will run the layout animation and unset the flag 184 private static final int FLAG_RUN_ANIMATION = 0x8; 185 186 // When set, there is either no layout animation on the ViewGroup or the layout 187 // animation is over 188 // Set by default 189 private static final int FLAG_ANIMATION_DONE = 0x10; 190 191 // If set, this ViewGroup has padding; if unset there is no padding and we don't need 192 // to clip it, even if FLAG_CLIP_TO_PADDING is set 193 private static final int FLAG_PADDING_NOT_NULL = 0x20; 194 195 // When set, this ViewGroup caches its children in a Bitmap before starting a layout animation 196 // Set by default 197 private static final int FLAG_ANIMATION_CACHE = 0x40; 198 199 // When set, this ViewGroup converts calls to invalidate(Rect) to invalidate() during a 200 // layout animation; this avoid clobbering the hierarchy 201 // Automatically set when the layout animation starts, depending on the animation's 202 // characteristics 203 private static final int FLAG_OPTIMIZE_INVALIDATE = 0x80; 204 205 // When set, the next call to drawChild() will clear mChildTransformation's matrix 206 private static final int FLAG_CLEAR_TRANSFORMATION = 0x100; 207 208 // When set, this ViewGroup invokes mAnimationListener.onAnimationEnd() and removes 209 // the children's Bitmap caches if necessary 210 // This flag is set when the layout animation is over (after FLAG_ANIMATION_DONE is set) 211 private static final int FLAG_NOTIFY_ANIMATION_LISTENER = 0x200; 212 213 /** 214 * When set, the drawing method will call {@link #getChildDrawingOrder(int, int)} 215 * to get the index of the child to draw for that iteration. 216 * 217 * @hide 218 */ 219 protected static final int FLAG_USE_CHILD_DRAWING_ORDER = 0x400; 220 221 /** 222 * When set, this ViewGroup supports static transformations on children; this causes 223 * {@link #getChildStaticTransformation(View, android.view.animation.Transformation)} to be 224 * invoked when a child is drawn. 225 * 226 * Any subclass overriding 227 * {@link #getChildStaticTransformation(View, android.view.animation.Transformation)} should 228 * set this flags in {@link #mGroupFlags}. 229 * 230 * {@hide} 231 */ 232 protected static final int FLAG_SUPPORT_STATIC_TRANSFORMATIONS = 0x800; 233 234 // When the previous drawChild() invocation used an alpha value that was lower than 235 // 1.0 and set it in mCachePaint 236 private static final int FLAG_ALPHA_LOWER_THAN_ONE = 0x1000; 237 238 /** 239 * When set, this ViewGroup's drawable states also include those 240 * of its children. 241 */ 242 private static final int FLAG_ADD_STATES_FROM_CHILDREN = 0x2000; 243 244 /** 245 * When set, this ViewGroup tries to always draw its children using their drawing cache. 246 */ 247 private static final int FLAG_ALWAYS_DRAWN_WITH_CACHE = 0x4000; 248 249 /** 250 * When set, and if FLAG_ALWAYS_DRAWN_WITH_CACHE is not set, this ViewGroup will try to 251 * draw its children with their drawing cache. 252 */ 253 private static final int FLAG_CHILDREN_DRAWN_WITH_CACHE = 0x8000; 254 255 /** 256 * When set, this group will go through its list of children to notify them of 257 * any drawable state change. 258 */ 259 private static final int FLAG_NOTIFY_CHILDREN_ON_DRAWABLE_STATE_CHANGE = 0x10000; 260 261 private static final int FLAG_MASK_FOCUSABILITY = 0x60000; 262 263 /** 264 * This view will get focus before any of its descendants. 265 */ 266 public static final int FOCUS_BEFORE_DESCENDANTS = 0x20000; 267 268 /** 269 * This view will get focus only if none of its descendants want it. 270 */ 271 public static final int FOCUS_AFTER_DESCENDANTS = 0x40000; 272 273 /** 274 * This view will block any of its descendants from getting focus, even 275 * if they are focusable. 276 */ 277 public static final int FOCUS_BLOCK_DESCENDANTS = 0x60000; 278 279 /** 280 * Used to map between enum in attrubutes and flag values. 281 */ 282 private static final int[] DESCENDANT_FOCUSABILITY_FLAGS = 283 {FOCUS_BEFORE_DESCENDANTS, FOCUS_AFTER_DESCENDANTS, 284 FOCUS_BLOCK_DESCENDANTS}; 285 286 /** 287 * When set, this ViewGroup should not intercept touch events. 288 * {@hide} 289 */ 290 protected static final int FLAG_DISALLOW_INTERCEPT = 0x80000; 291 292 /** 293 * When set, this ViewGroup will split MotionEvents to multiple child Views when appropriate. 294 */ 295 private static final int FLAG_SPLIT_MOTION_EVENTS = 0x200000; 296 297 /** 298 * When set, this ViewGroup will not dispatch onAttachedToWindow calls 299 * to children when adding new views. This is used to prevent multiple 300 * onAttached calls when a ViewGroup adds children in its own onAttached method. 301 */ 302 private static final int FLAG_PREVENT_DISPATCH_ATTACHED_TO_WINDOW = 0x400000; 303 304 /** 305 * Indicates which types of drawing caches are to be kept in memory. 306 * This field should be made private, so it is hidden from the SDK. 307 * {@hide} 308 */ 309 protected int mPersistentDrawingCache; 310 311 /** 312 * Used to indicate that no drawing cache should be kept in memory. 313 */ 314 public static final int PERSISTENT_NO_CACHE = 0x0; 315 316 /** 317 * Used to indicate that the animation drawing cache should be kept in memory. 318 */ 319 public static final int PERSISTENT_ANIMATION_CACHE = 0x1; 320 321 /** 322 * Used to indicate that the scrolling drawing cache should be kept in memory. 323 */ 324 public static final int PERSISTENT_SCROLLING_CACHE = 0x2; 325 326 /** 327 * Used to indicate that all drawing caches should be kept in memory. 328 */ 329 public static final int PERSISTENT_ALL_CACHES = 0x3; 330 331 /** 332 * We clip to padding when FLAG_CLIP_TO_PADDING and FLAG_PADDING_NOT_NULL 333 * are set at the same time. 334 */ 335 protected static final int CLIP_TO_PADDING_MASK = FLAG_CLIP_TO_PADDING | FLAG_PADDING_NOT_NULL; 336 337 // Index of the child's left position in the mLocation array 338 private static final int CHILD_LEFT_INDEX = 0; 339 // Index of the child's top position in the mLocation array 340 private static final int CHILD_TOP_INDEX = 1; 341 342 // Child views of this ViewGroup 343 private View[] mChildren; 344 // Number of valid children in the mChildren array, the rest should be null or not 345 // considered as children 346 347 private boolean mLayoutSuppressed = false; 348 349 private int mChildrenCount; 350 351 private static final int ARRAY_INITIAL_CAPACITY = 12; 352 private static final int ARRAY_CAPACITY_INCREMENT = 12; 353 354 // Used to draw cached views 355 private Paint mCachePaint; 356 357 // Used to animate add/remove changes in layout 358 private LayoutTransition mTransition; 359 360 // The set of views that are currently being transitioned. This list is used to track views 361 // being removed that should not actually be removed from the parent yet because they are 362 // being animated. 363 private ArrayList<View> mTransitioningViews; 364 365 // List of children changing visibility. This is used to potentially keep rendering 366 // views during a transition when they otherwise would have become gone/invisible 367 private ArrayList<View> mVisibilityChangingChildren; 368 369 // Indicates whether this container will use its children layers to draw 370 @ViewDebug.ExportedProperty(category = "drawing") 371 private boolean mDrawLayers = true; 372 373 public ViewGroup(Context context) { 374 super(context); 375 initViewGroup(); 376 } 377 378 public ViewGroup(Context context, AttributeSet attrs) { 379 super(context, attrs); 380 initViewGroup(); 381 initFromAttributes(context, attrs); 382 } 383 384 public ViewGroup(Context context, AttributeSet attrs, int defStyle) { 385 super(context, attrs, defStyle); 386 initViewGroup(); 387 initFromAttributes(context, attrs); 388 } 389 390 private void initViewGroup() { 391 // ViewGroup doesn't draw by default 392 setFlags(WILL_NOT_DRAW, DRAW_MASK); 393 mGroupFlags |= FLAG_CLIP_CHILDREN; 394 mGroupFlags |= FLAG_CLIP_TO_PADDING; 395 mGroupFlags |= FLAG_ANIMATION_DONE; 396 mGroupFlags |= FLAG_ANIMATION_CACHE; 397 mGroupFlags |= FLAG_ALWAYS_DRAWN_WITH_CACHE; 398 399 if (mContext.getApplicationInfo().targetSdkVersion >= Build.VERSION_CODES.HONEYCOMB) { 400 mGroupFlags |= FLAG_SPLIT_MOTION_EVENTS; 401 } 402 403 setDescendantFocusability(FOCUS_BEFORE_DESCENDANTS); 404 405 mChildren = new View[ARRAY_INITIAL_CAPACITY]; 406 mChildrenCount = 0; 407 408 mPersistentDrawingCache = PERSISTENT_SCROLLING_CACHE; 409 } 410 411 private void initFromAttributes(Context context, AttributeSet attrs) { 412 TypedArray a = context.obtainStyledAttributes(attrs, 413 R.styleable.ViewGroup); 414 415 final int N = a.getIndexCount(); 416 for (int i = 0; i < N; i++) { 417 int attr = a.getIndex(i); 418 switch (attr) { 419 case R.styleable.ViewGroup_clipChildren: 420 setClipChildren(a.getBoolean(attr, true)); 421 break; 422 case R.styleable.ViewGroup_clipToPadding: 423 setClipToPadding(a.getBoolean(attr, true)); 424 break; 425 case R.styleable.ViewGroup_animationCache: 426 setAnimationCacheEnabled(a.getBoolean(attr, true)); 427 break; 428 case R.styleable.ViewGroup_persistentDrawingCache: 429 setPersistentDrawingCache(a.getInt(attr, PERSISTENT_SCROLLING_CACHE)); 430 break; 431 case R.styleable.ViewGroup_addStatesFromChildren: 432 setAddStatesFromChildren(a.getBoolean(attr, false)); 433 break; 434 case R.styleable.ViewGroup_alwaysDrawnWithCache: 435 setAlwaysDrawnWithCacheEnabled(a.getBoolean(attr, true)); 436 break; 437 case R.styleable.ViewGroup_layoutAnimation: 438 int id = a.getResourceId(attr, -1); 439 if (id > 0) { 440 setLayoutAnimation(AnimationUtils.loadLayoutAnimation(mContext, id)); 441 } 442 break; 443 case R.styleable.ViewGroup_descendantFocusability: 444 setDescendantFocusability(DESCENDANT_FOCUSABILITY_FLAGS[a.getInt(attr, 0)]); 445 break; 446 case R.styleable.ViewGroup_splitMotionEvents: 447 setMotionEventSplittingEnabled(a.getBoolean(attr, false)); 448 break; 449 case R.styleable.ViewGroup_animateLayoutChanges: 450 boolean animateLayoutChanges = a.getBoolean(attr, false); 451 if (animateLayoutChanges) { 452 setLayoutTransition(new LayoutTransition()); 453 } 454 break; 455 } 456 } 457 458 a.recycle(); 459 } 460 461 /** 462 * Gets the descendant focusability of this view group. The descendant 463 * focusability defines the relationship between this view group and its 464 * descendants when looking for a view to take focus in 465 * {@link #requestFocus(int, android.graphics.Rect)}. 466 * 467 * @return one of {@link #FOCUS_BEFORE_DESCENDANTS}, {@link #FOCUS_AFTER_DESCENDANTS}, 468 * {@link #FOCUS_BLOCK_DESCENDANTS}. 469 */ 470 @ViewDebug.ExportedProperty(category = "focus", mapping = { 471 @ViewDebug.IntToString(from = FOCUS_BEFORE_DESCENDANTS, to = "FOCUS_BEFORE_DESCENDANTS"), 472 @ViewDebug.IntToString(from = FOCUS_AFTER_DESCENDANTS, to = "FOCUS_AFTER_DESCENDANTS"), 473 @ViewDebug.IntToString(from = FOCUS_BLOCK_DESCENDANTS, to = "FOCUS_BLOCK_DESCENDANTS") 474 }) 475 public int getDescendantFocusability() { 476 return mGroupFlags & FLAG_MASK_FOCUSABILITY; 477 } 478 479 /** 480 * Set the descendant focusability of this view group. This defines the relationship 481 * between this view group and its descendants when looking for a view to 482 * take focus in {@link #requestFocus(int, android.graphics.Rect)}. 483 * 484 * @param focusability one of {@link #FOCUS_BEFORE_DESCENDANTS}, {@link #FOCUS_AFTER_DESCENDANTS}, 485 * {@link #FOCUS_BLOCK_DESCENDANTS}. 486 */ 487 public void setDescendantFocusability(int focusability) { 488 switch (focusability) { 489 case FOCUS_BEFORE_DESCENDANTS: 490 case FOCUS_AFTER_DESCENDANTS: 491 case FOCUS_BLOCK_DESCENDANTS: 492 break; 493 default: 494 throw new IllegalArgumentException("must be one of FOCUS_BEFORE_DESCENDANTS, " 495 + "FOCUS_AFTER_DESCENDANTS, FOCUS_BLOCK_DESCENDANTS"); 496 } 497 mGroupFlags &= ~FLAG_MASK_FOCUSABILITY; 498 mGroupFlags |= (focusability & FLAG_MASK_FOCUSABILITY); 499 } 500 501 /** 502 * {@inheritDoc} 503 */ 504 @Override 505 void handleFocusGainInternal(int direction, Rect previouslyFocusedRect) { 506 if (mFocused != null) { 507 mFocused.unFocus(); 508 mFocused = null; 509 } 510 super.handleFocusGainInternal(direction, previouslyFocusedRect); 511 } 512 513 /** 514 * {@inheritDoc} 515 */ 516 public void requestChildFocus(View child, View focused) { 517 if (DBG) { 518 System.out.println(this + " requestChildFocus()"); 519 } 520 if (getDescendantFocusability() == FOCUS_BLOCK_DESCENDANTS) { 521 return; 522 } 523 524 // Unfocus us, if necessary 525 super.unFocus(); 526 527 // We had a previous notion of who had focus. Clear it. 528 if (mFocused != child) { 529 if (mFocused != null) { 530 mFocused.unFocus(); 531 } 532 533 mFocused = child; 534 } 535 if (mParent != null) { 536 mParent.requestChildFocus(this, focused); 537 } 538 } 539 540 /** 541 * {@inheritDoc} 542 */ 543 public void focusableViewAvailable(View v) { 544 if (mParent != null 545 // shortcut: don't report a new focusable view if we block our descendants from 546 // getting focus 547 && (getDescendantFocusability() != FOCUS_BLOCK_DESCENDANTS) 548 // shortcut: don't report a new focusable view if we already are focused 549 // (and we don't prefer our descendants) 550 // 551 // note: knowing that mFocused is non-null is not a good enough reason 552 // to break the traversal since in that case we'd actually have to find 553 // the focused view and make sure it wasn't FOCUS_AFTER_DESCENDANTS and 554 // an ancestor of v; this will get checked for at ViewAncestor 555 && !(isFocused() && getDescendantFocusability() != FOCUS_AFTER_DESCENDANTS)) { 556 mParent.focusableViewAvailable(v); 557 } 558 } 559 560 /** 561 * {@inheritDoc} 562 */ 563 public boolean showContextMenuForChild(View originalView) { 564 return mParent != null && mParent.showContextMenuForChild(originalView); 565 } 566 567 /** 568 * {@inheritDoc} 569 */ 570 public ActionMode startActionModeForChild(View originalView, ActionMode.Callback callback) { 571 return mParent != null ? mParent.startActionModeForChild(originalView, callback) : null; 572 } 573 574 /** 575 * Find the nearest view in the specified direction that wants to take 576 * focus. 577 * 578 * @param focused The view that currently has focus 579 * @param direction One of FOCUS_UP, FOCUS_DOWN, FOCUS_LEFT, and 580 * FOCUS_RIGHT, or 0 for not applicable. 581 */ 582 public View focusSearch(View focused, int direction) { 583 if (isRootNamespace()) { 584 // root namespace means we should consider ourselves the top of the 585 // tree for focus searching; otherwise we could be focus searching 586 // into other tabs. see LocalActivityManager and TabHost for more info 587 return FocusFinder.getInstance().findNextFocus(this, focused, direction); 588 } else if (mParent != null) { 589 return mParent.focusSearch(focused, direction); 590 } 591 return null; 592 } 593 594 /** 595 * {@inheritDoc} 596 */ 597 public boolean requestChildRectangleOnScreen(View child, Rect rectangle, boolean immediate) { 598 return false; 599 } 600 601 /** 602 * {@inheritDoc} 603 */ 604 public boolean requestSendAccessibilityEvent(View child, AccessibilityEvent event) { 605 ViewParent parent = getParent(); 606 if (parent == null) { 607 return false; 608 } 609 final boolean propagate = onRequestSendAccessibilityEvent(child, event); 610 //noinspection SimplifiableIfStatement 611 if (!propagate) { 612 return false; 613 } 614 return parent.requestSendAccessibilityEvent(this, event); 615 } 616 617 /** 618 * Called when a child has requested sending an {@link AccessibilityEvent} and 619 * gives an opportunity to its parent to augment the event. 620 * <p> 621 * If an {@link android.view.View.AccessibilityDelegate} has been specified via calling 622 * {@link android.view.View#setAccessibilityDelegate(android.view.View.AccessibilityDelegate)} its 623 * {@link android.view.View.AccessibilityDelegate#onRequestSendAccessibilityEvent(ViewGroup, View, AccessibilityEvent)} 624 * is responsible for handling this call. 625 * </p> 626 * 627 * @param child The child which requests sending the event. 628 * @param event The event to be sent. 629 * @return True if the event should be sent. 630 * 631 * @see #requestSendAccessibilityEvent(View, AccessibilityEvent) 632 */ 633 public boolean onRequestSendAccessibilityEvent(View child, AccessibilityEvent event) { 634 if (mAccessibilityDelegate != null) { 635 return mAccessibilityDelegate.onRequestSendAccessibilityEvent(this, child, event); 636 } else { 637 return onRequestSendAccessibilityEventInternal(child, event); 638 } 639 } 640 641 /** 642 * @see #onRequestSendAccessibilityEvent(View, AccessibilityEvent) 643 * 644 * Note: Called from the default {@link View.AccessibilityDelegate}. 645 */ 646 boolean onRequestSendAccessibilityEventInternal(View child, AccessibilityEvent event) { 647 return true; 648 } 649 650 /** 651 * {@inheritDoc} 652 */ 653 @Override 654 public boolean dispatchUnhandledMove(View focused, int direction) { 655 return mFocused != null && 656 mFocused.dispatchUnhandledMove(focused, direction); 657 } 658 659 /** 660 * {@inheritDoc} 661 */ 662 public void clearChildFocus(View child) { 663 if (DBG) { 664 System.out.println(this + " clearChildFocus()"); 665 } 666 667 mFocused = null; 668 if (mParent != null) { 669 mParent.clearChildFocus(this); 670 } 671 } 672 673 /** 674 * {@inheritDoc} 675 */ 676 @Override 677 public void clearFocus() { 678 super.clearFocus(); 679 680 // clear any child focus if it exists 681 if (mFocused != null) { 682 mFocused.clearFocus(); 683 } 684 } 685 686 /** 687 * {@inheritDoc} 688 */ 689 @Override 690 void unFocus() { 691 if (DBG) { 692 System.out.println(this + " unFocus()"); 693 } 694 695 super.unFocus(); 696 if (mFocused != null) { 697 mFocused.unFocus(); 698 } 699 mFocused = null; 700 } 701 702 /** 703 * Returns the focused child of this view, if any. The child may have focus 704 * or contain focus. 705 * 706 * @return the focused child or null. 707 */ 708 public View getFocusedChild() { 709 return mFocused; 710 } 711 712 /** 713 * Returns true if this view has or contains focus 714 * 715 * @return true if this view has or contains focus 716 */ 717 @Override 718 public boolean hasFocus() { 719 return (mPrivateFlags & FOCUSED) != 0 || mFocused != null; 720 } 721 722 /* 723 * (non-Javadoc) 724 * 725 * @see android.view.View#findFocus() 726 */ 727 @Override 728 public View findFocus() { 729 if (DBG) { 730 System.out.println("Find focus in " + this + ": flags=" 731 + isFocused() + ", child=" + mFocused); 732 } 733 734 if (isFocused()) { 735 return this; 736 } 737 738 if (mFocused != null) { 739 return mFocused.findFocus(); 740 } 741 return null; 742 } 743 744 /** 745 * {@inheritDoc} 746 */ 747 @Override 748 public boolean hasFocusable() { 749 if ((mViewFlags & VISIBILITY_MASK) != VISIBLE) { 750 return false; 751 } 752 753 if (isFocusable()) { 754 return true; 755 } 756 757 final int descendantFocusability = getDescendantFocusability(); 758 if (descendantFocusability != FOCUS_BLOCK_DESCENDANTS) { 759 final int count = mChildrenCount; 760 final View[] children = mChildren; 761 762 for (int i = 0; i < count; i++) { 763 final View child = children[i]; 764 if (child.hasFocusable()) { 765 return true; 766 } 767 } 768 } 769 770 return false; 771 } 772 773 /** 774 * {@inheritDoc} 775 */ 776 @Override 777 public void addFocusables(ArrayList<View> views, int direction) { 778 addFocusables(views, direction, FOCUSABLES_TOUCH_MODE); 779 } 780 781 /** 782 * {@inheritDoc} 783 */ 784 @Override 785 public void addFocusables(ArrayList<View> views, int direction, int focusableMode) { 786 final int focusableCount = views.size(); 787 788 final int descendantFocusability = getDescendantFocusability(); 789 790 if (descendantFocusability != FOCUS_BLOCK_DESCENDANTS) { 791 final int count = mChildrenCount; 792 final View[] children = mChildren; 793 794 for (int i = 0; i < count; i++) { 795 final View child = children[i]; 796 if ((child.mViewFlags & VISIBILITY_MASK) == VISIBLE) { 797 child.addFocusables(views, direction, focusableMode); 798 } 799 } 800 } 801 802 // we add ourselves (if focusable) in all cases except for when we are 803 // FOCUS_AFTER_DESCENDANTS and there are some descendants focusable. this is 804 // to avoid the focus search finding layouts when a more precise search 805 // among the focusable children would be more interesting. 806 if ( 807 descendantFocusability != FOCUS_AFTER_DESCENDANTS || 808 // No focusable descendants 809 (focusableCount == views.size())) { 810 super.addFocusables(views, direction, focusableMode); 811 } 812 } 813 814 @Override 815 public void findViewsWithText(ArrayList<View> outViews, CharSequence text, int flags) { 816 super.findViewsWithText(outViews, text, flags); 817 final int childrenCount = mChildrenCount; 818 final View[] children = mChildren; 819 for (int i = 0; i < childrenCount; i++) { 820 View child = children[i]; 821 if ((child.mViewFlags & VISIBILITY_MASK) == VISIBLE 822 && (child.mPrivateFlags & IS_ROOT_NAMESPACE) == 0) { 823 child.findViewsWithText(outViews, text, flags); 824 } 825 } 826 } 827 828 @Override 829 View findViewByAccessibilityIdTraversal(int accessibilityId) { 830 View foundView = super.findViewByAccessibilityIdTraversal(accessibilityId); 831 if (foundView != null) { 832 return foundView; 833 } 834 final int childrenCount = mChildrenCount; 835 final View[] children = mChildren; 836 for (int i = 0; i < childrenCount; i++) { 837 View child = children[i]; 838 foundView = child.findViewByAccessibilityIdTraversal(accessibilityId); 839 if (foundView != null) { 840 return foundView; 841 } 842 } 843 return null; 844 } 845 846 /** 847 * {@inheritDoc} 848 */ 849 @Override 850 public void dispatchWindowFocusChanged(boolean hasFocus) { 851 super.dispatchWindowFocusChanged(hasFocus); 852 final int count = mChildrenCount; 853 final View[] children = mChildren; 854 for (int i = 0; i < count; i++) { 855 children[i].dispatchWindowFocusChanged(hasFocus); 856 } 857 } 858 859 /** 860 * {@inheritDoc} 861 */ 862 @Override 863 public void addTouchables(ArrayList<View> views) { 864 super.addTouchables(views); 865 866 final int count = mChildrenCount; 867 final View[] children = mChildren; 868 869 for (int i = 0; i < count; i++) { 870 final View child = children[i]; 871 if ((child.mViewFlags & VISIBILITY_MASK) == VISIBLE) { 872 child.addTouchables(views); 873 } 874 } 875 } 876 877 /** 878 * {@inheritDoc} 879 */ 880 @Override 881 public void dispatchDisplayHint(int hint) { 882 super.dispatchDisplayHint(hint); 883 final int count = mChildrenCount; 884 final View[] children = mChildren; 885 for (int i = 0; i < count; i++) { 886 children[i].dispatchDisplayHint(hint); 887 } 888 } 889 890 /** 891 * @hide 892 * @param child 893 * @param visibility 894 */ 895 protected void onChildVisibilityChanged(View child, int visibility) { 896 if (mTransition != null) { 897 if (visibility == VISIBLE) { 898 mTransition.showChild(this, child); 899 } else { 900 mTransition.hideChild(this, child); 901 } 902 if (visibility != VISIBLE) { 903 // Only track this on disappearing views - appearing views are already visible 904 // and don't need special handling during drawChild() 905 if (mVisibilityChangingChildren == null) { 906 mVisibilityChangingChildren = new ArrayList<View>(); 907 } 908 mVisibilityChangingChildren.add(child); 909 if (mTransitioningViews != null && mTransitioningViews.contains(child)) { 910 addDisappearingView(child); 911 } 912 } 913 } 914 915 // in all cases, for drags 916 if (mCurrentDrag != null) { 917 if (visibility == VISIBLE) { 918 notifyChildOfDrag(child); 919 } 920 } 921 } 922 923 /** 924 * {@inheritDoc} 925 */ 926 @Override 927 protected void dispatchVisibilityChanged(View changedView, int visibility) { 928 super.dispatchVisibilityChanged(changedView, visibility); 929 final int count = mChildrenCount; 930 final View[] children = mChildren; 931 for (int i = 0; i < count; i++) { 932 children[i].dispatchVisibilityChanged(changedView, visibility); 933 } 934 } 935 936 /** 937 * {@inheritDoc} 938 */ 939 @Override 940 public void dispatchWindowVisibilityChanged(int visibility) { 941 super.dispatchWindowVisibilityChanged(visibility); 942 final int count = mChildrenCount; 943 final View[] children = mChildren; 944 for (int i = 0; i < count; i++) { 945 children[i].dispatchWindowVisibilityChanged(visibility); 946 } 947 } 948 949 /** 950 * {@inheritDoc} 951 */ 952 @Override 953 public void dispatchConfigurationChanged(Configuration newConfig) { 954 super.dispatchConfigurationChanged(newConfig); 955 final int count = mChildrenCount; 956 final View[] children = mChildren; 957 for (int i = 0; i < count; i++) { 958 children[i].dispatchConfigurationChanged(newConfig); 959 } 960 } 961 962 /** 963 * {@inheritDoc} 964 */ 965 public void recomputeViewAttributes(View child) { 966 if (mAttachInfo != null && !mAttachInfo.mRecomputeGlobalAttributes) { 967 ViewParent parent = mParent; 968 if (parent != null) parent.recomputeViewAttributes(this); 969 } 970 } 971 972 @Override 973 void dispatchCollectViewAttributes(int visibility) { 974 visibility |= mViewFlags&VISIBILITY_MASK; 975 super.dispatchCollectViewAttributes(visibility); 976 final int count = mChildrenCount; 977 final View[] children = mChildren; 978 for (int i = 0; i < count; i++) { 979 children[i].dispatchCollectViewAttributes(visibility); 980 } 981 } 982 983 /** 984 * {@inheritDoc} 985 */ 986 public void bringChildToFront(View child) { 987 int index = indexOfChild(child); 988 if (index >= 0) { 989 removeFromArray(index); 990 addInArray(child, mChildrenCount); 991 child.mParent = this; 992 } 993 } 994 995 /** 996 * {@inheritDoc} 997 * 998 * !!! TODO: write real docs 999 */ 1000 @Override 1001 public boolean dispatchDragEvent(DragEvent event) { 1002 boolean retval = false; 1003 final float tx = event.mX; 1004 final float ty = event.mY; 1005 1006 ViewRootImpl root = getViewRootImpl(); 1007 1008 // Dispatch down the view hierarchy 1009 switch (event.mAction) { 1010 case DragEvent.ACTION_DRAG_STARTED: { 1011 // clear state to recalculate which views we drag over 1012 mCurrentDragView = null; 1013 1014 // Set up our tracking of drag-started notifications 1015 mCurrentDrag = DragEvent.obtain(event); 1016 if (mDragNotifiedChildren == null) { 1017 mDragNotifiedChildren = new HashSet<View>(); 1018 } else { 1019 mDragNotifiedChildren.clear(); 1020 } 1021 1022 // Now dispatch down to our children, caching the responses 1023 mChildAcceptsDrag = false; 1024 final int count = mChildrenCount; 1025 final View[] children = mChildren; 1026 for (int i = 0; i < count; i++) { 1027 final View child = children[i]; 1028 child.mPrivateFlags2 &= ~View.DRAG_MASK; 1029 if (child.getVisibility() == VISIBLE) { 1030 final boolean handled = notifyChildOfDrag(children[i]); 1031 if (handled) { 1032 mChildAcceptsDrag = true; 1033 } 1034 } 1035 } 1036 1037 // Return HANDLED if one of our children can accept the drag 1038 if (mChildAcceptsDrag) { 1039 retval = true; 1040 } 1041 } break; 1042 1043 case DragEvent.ACTION_DRAG_ENDED: { 1044 // Release the bookkeeping now that the drag lifecycle has ended 1045 if (mDragNotifiedChildren != null) { 1046 for (View child : mDragNotifiedChildren) { 1047 // If a child was notified about an ongoing drag, it's told that it's over 1048 child.dispatchDragEvent(event); 1049 child.mPrivateFlags2 &= ~View.DRAG_MASK; 1050 child.refreshDrawableState(); 1051 } 1052 1053 mDragNotifiedChildren.clear(); 1054 mCurrentDrag.recycle(); 1055 mCurrentDrag = null; 1056 } 1057 1058 // We consider drag-ended to have been handled if one of our children 1059 // had offered to handle the drag. 1060 if (mChildAcceptsDrag) { 1061 retval = true; 1062 } 1063 } break; 1064 1065 case DragEvent.ACTION_DRAG_LOCATION: { 1066 // Find the [possibly new] drag target 1067 final View target = findFrontmostDroppableChildAt(event.mX, event.mY, mLocalPoint); 1068 1069 // If we've changed apparent drag target, tell the view root which view 1070 // we're over now [for purposes of the eventual drag-recipient-changed 1071 // notifications to the framework] and tell the new target that the drag 1072 // has entered its bounds. The root will see setDragFocus() calls all 1073 // the way down to the final leaf view that is handling the LOCATION event 1074 // before reporting the new potential recipient to the framework. 1075 if (mCurrentDragView != target) { 1076 root.setDragFocus(target); 1077 1078 final int action = event.mAction; 1079 // If we've dragged off of a child view, send it the EXITED message 1080 if (mCurrentDragView != null) { 1081 final View view = mCurrentDragView; 1082 event.mAction = DragEvent.ACTION_DRAG_EXITED; 1083 view.dispatchDragEvent(event); 1084 view.mPrivateFlags2 &= ~View.DRAG_HOVERED; 1085 view.refreshDrawableState(); 1086 } 1087 mCurrentDragView = target; 1088 1089 // If we've dragged over a new child view, send it the ENTERED message 1090 if (target != null) { 1091 event.mAction = DragEvent.ACTION_DRAG_ENTERED; 1092 target.dispatchDragEvent(event); 1093 target.mPrivateFlags2 |= View.DRAG_HOVERED; 1094 target.refreshDrawableState(); 1095 } 1096 event.mAction = action; // restore the event's original state 1097 } 1098 1099 // Dispatch the actual drag location notice, localized into its coordinates 1100 if (target != null) { 1101 event.mX = mLocalPoint.x; 1102 event.mY = mLocalPoint.y; 1103 1104 retval = target.dispatchDragEvent(event); 1105 1106 event.mX = tx; 1107 event.mY = ty; 1108 } 1109 } break; 1110 1111 /* Entered / exited dispatch 1112 * 1113 * DRAG_ENTERED is not dispatched downwards from ViewGroup. The reason for this is 1114 * that we're about to get the corresponding LOCATION event, which we will use to 1115 * determine which of our children is the new target; at that point we will 1116 * push a DRAG_ENTERED down to the new target child [which may itself be a ViewGroup]. 1117 * 1118 * DRAG_EXITED *is* dispatched all the way down immediately: once we know the 1119 * drag has left this ViewGroup, we know by definition that every contained subview 1120 * is also no longer under the drag point. 1121 */ 1122 1123 case DragEvent.ACTION_DRAG_EXITED: { 1124 if (mCurrentDragView != null) { 1125 final View view = mCurrentDragView; 1126 view.dispatchDragEvent(event); 1127 view.mPrivateFlags2 &= ~View.DRAG_HOVERED; 1128 view.refreshDrawableState(); 1129 1130 mCurrentDragView = null; 1131 } 1132 } break; 1133 1134 case DragEvent.ACTION_DROP: { 1135 if (ViewDebug.DEBUG_DRAG) Log.d(View.VIEW_LOG_TAG, "Drop event: " + event); 1136 View target = findFrontmostDroppableChildAt(event.mX, event.mY, mLocalPoint); 1137 if (target != null) { 1138 if (ViewDebug.DEBUG_DRAG) Log.d(View.VIEW_LOG_TAG, " dispatch drop to " + target); 1139 event.mX = mLocalPoint.x; 1140 event.mY = mLocalPoint.y; 1141 retval = target.dispatchDragEvent(event); 1142 event.mX = tx; 1143 event.mY = ty; 1144 } else { 1145 if (ViewDebug.DEBUG_DRAG) { 1146 Log.d(View.VIEW_LOG_TAG, " not dropped on an accepting view"); 1147 } 1148 } 1149 } break; 1150 } 1151 1152 // If none of our children could handle the event, try here 1153 if (!retval) { 1154 // Call up to the View implementation that dispatches to installed listeners 1155 retval = super.dispatchDragEvent(event); 1156 } 1157 return retval; 1158 } 1159 1160 // Find the frontmost child view that lies under the given point, and calculate 1161 // the position within its own local coordinate system. 1162 View findFrontmostDroppableChildAt(float x, float y, PointF outLocalPoint) { 1163 final int count = mChildrenCount; 1164 final View[] children = mChildren; 1165 for (int i = count - 1; i >= 0; i--) { 1166 final View child = children[i]; 1167 if (!child.canAcceptDrag()) { 1168 continue; 1169 } 1170 1171 if (isTransformedTouchPointInView(x, y, child, outLocalPoint)) { 1172 return child; 1173 } 1174 } 1175 return null; 1176 } 1177 1178 boolean notifyChildOfDrag(View child) { 1179 if (ViewDebug.DEBUG_DRAG) { 1180 Log.d(View.VIEW_LOG_TAG, "Sending drag-started to view: " + child); 1181 } 1182 1183 boolean canAccept = false; 1184 if (! mDragNotifiedChildren.contains(child)) { 1185 mDragNotifiedChildren.add(child); 1186 canAccept = child.dispatchDragEvent(mCurrentDrag); 1187 if (canAccept && !child.canAcceptDrag()) { 1188 child.mPrivateFlags2 |= View.DRAG_CAN_ACCEPT; 1189 child.refreshDrawableState(); 1190 } 1191 } 1192 return canAccept; 1193 } 1194 1195 @Override 1196 public void dispatchSystemUiVisibilityChanged(int visible) { 1197 super.dispatchSystemUiVisibilityChanged(visible); 1198 1199 final int count = mChildrenCount; 1200 final View[] children = mChildren; 1201 for (int i=0; i <count; i++) { 1202 final View child = children[i]; 1203 child.dispatchSystemUiVisibilityChanged(visible); 1204 } 1205 } 1206 1207 @Override 1208 void updateLocalSystemUiVisibility(int localValue, int localChanges) { 1209 super.updateLocalSystemUiVisibility(localValue, localChanges); 1210 1211 final int count = mChildrenCount; 1212 final View[] children = mChildren; 1213 for (int i=0; i <count; i++) { 1214 final View child = children[i]; 1215 child.updateLocalSystemUiVisibility(localValue, localChanges); 1216 } 1217 } 1218 1219 /** 1220 * {@inheritDoc} 1221 */ 1222 @Override 1223 public boolean dispatchKeyEventPreIme(KeyEvent event) { 1224 if ((mPrivateFlags & (FOCUSED | HAS_BOUNDS)) == (FOCUSED | HAS_BOUNDS)) { 1225 return super.dispatchKeyEventPreIme(event); 1226 } else if (mFocused != null && (mFocused.mPrivateFlags & HAS_BOUNDS) == HAS_BOUNDS) { 1227 return mFocused.dispatchKeyEventPreIme(event); 1228 } 1229 return false; 1230 } 1231 1232 /** 1233 * {@inheritDoc} 1234 */ 1235 @Override 1236 public boolean dispatchKeyEvent(KeyEvent event) { 1237 if (mInputEventConsistencyVerifier != null) { 1238 mInputEventConsistencyVerifier.onKeyEvent(event, 1); 1239 } 1240 1241 if ((mPrivateFlags & (FOCUSED | HAS_BOUNDS)) == (FOCUSED | HAS_BOUNDS)) { 1242 if (super.dispatchKeyEvent(event)) { 1243 return true; 1244 } 1245 } else if (mFocused != null && (mFocused.mPrivateFlags & HAS_BOUNDS) == HAS_BOUNDS) { 1246 if (mFocused.dispatchKeyEvent(event)) { 1247 return true; 1248 } 1249 } 1250 1251 if (mInputEventConsistencyVerifier != null) { 1252 mInputEventConsistencyVerifier.onUnhandledEvent(event, 1); 1253 } 1254 return false; 1255 } 1256 1257 /** 1258 * {@inheritDoc} 1259 */ 1260 @Override 1261 public boolean dispatchKeyShortcutEvent(KeyEvent event) { 1262 if ((mPrivateFlags & (FOCUSED | HAS_BOUNDS)) == (FOCUSED | HAS_BOUNDS)) { 1263 return super.dispatchKeyShortcutEvent(event); 1264 } else if (mFocused != null && (mFocused.mPrivateFlags & HAS_BOUNDS) == HAS_BOUNDS) { 1265 return mFocused.dispatchKeyShortcutEvent(event); 1266 } 1267 return false; 1268 } 1269 1270 /** 1271 * {@inheritDoc} 1272 */ 1273 @Override 1274 public boolean dispatchTrackballEvent(MotionEvent event) { 1275 if (mInputEventConsistencyVerifier != null) { 1276 mInputEventConsistencyVerifier.onTrackballEvent(event, 1); 1277 } 1278 1279 if ((mPrivateFlags & (FOCUSED | HAS_BOUNDS)) == (FOCUSED | HAS_BOUNDS)) { 1280 if (super.dispatchTrackballEvent(event)) { 1281 return true; 1282 } 1283 } else if (mFocused != null && (mFocused.mPrivateFlags & HAS_BOUNDS) == HAS_BOUNDS) { 1284 if (mFocused.dispatchTrackballEvent(event)) { 1285 return true; 1286 } 1287 } 1288 1289 if (mInputEventConsistencyVerifier != null) { 1290 mInputEventConsistencyVerifier.onUnhandledEvent(event, 1); 1291 } 1292 return false; 1293 } 1294 1295 /** 1296 * {@inheritDoc} 1297 */ 1298 @SuppressWarnings({"ConstantConditions"}) 1299 @Override 1300 protected boolean dispatchHoverEvent(MotionEvent event) { 1301 final int action = event.getAction(); 1302 1303 // First check whether the view group wants to intercept the hover event. 1304 final boolean interceptHover = onInterceptHoverEvent(event); 1305 event.setAction(action); // restore action in case it was changed 1306 1307 MotionEvent eventNoHistory = event; 1308 boolean handled = false; 1309 1310 // Send events to the hovered children and build a new list of hover targets until 1311 // one is found that handles the event. 1312 HoverTarget firstOldHoverTarget = mFirstHoverTarget; 1313 mFirstHoverTarget = null; 1314 if (!interceptHover && action != MotionEvent.ACTION_HOVER_EXIT) { 1315 final float x = event.getX(); 1316 final float y = event.getY(); 1317 final int childrenCount = mChildrenCount; 1318 if (childrenCount != 0) { 1319 final View[] children = mChildren; 1320 HoverTarget lastHoverTarget = null; 1321 for (int i = childrenCount - 1; i >= 0; i--) { 1322 final View child = children[i]; 1323 if (!canViewReceivePointerEvents(child) 1324 || !isTransformedTouchPointInView(x, y, child, null)) { 1325 continue; 1326 } 1327 1328 // Obtain a hover target for this child. Dequeue it from the 1329 // old hover target list if the child was previously hovered. 1330 HoverTarget hoverTarget = firstOldHoverTarget; 1331 final boolean wasHovered; 1332 for (HoverTarget predecessor = null; ;) { 1333 if (hoverTarget == null) { 1334 hoverTarget = HoverTarget.obtain(child); 1335 wasHovered = false; 1336 break; 1337 } 1338 1339 if (hoverTarget.child == child) { 1340 if (predecessor != null) { 1341 predecessor.next = hoverTarget.next; 1342 } else { 1343 firstOldHoverTarget = hoverTarget.next; 1344 } 1345 hoverTarget.next = null; 1346 wasHovered = true; 1347 break; 1348 } 1349 1350 predecessor = hoverTarget; 1351 hoverTarget = hoverTarget.next; 1352 } 1353 1354 // Enqueue the hover target onto the new hover target list. 1355 if (lastHoverTarget != null) { 1356 lastHoverTarget.next = hoverTarget; 1357 } else { 1358 lastHoverTarget = hoverTarget; 1359 mFirstHoverTarget = hoverTarget; 1360 } 1361 1362 // Dispatch the event to the child. 1363 if (action == MotionEvent.ACTION_HOVER_ENTER) { 1364 if (!wasHovered) { 1365 // Send the enter as is. 1366 handled |= dispatchTransformedGenericPointerEvent( 1367 event, child); // enter 1368 } 1369 } else if (action == MotionEvent.ACTION_HOVER_MOVE) { 1370 if (!wasHovered) { 1371 // Synthesize an enter from a move. 1372 eventNoHistory = obtainMotionEventNoHistoryOrSelf(eventNoHistory); 1373 eventNoHistory.setAction(MotionEvent.ACTION_HOVER_ENTER); 1374 handled |= dispatchTransformedGenericPointerEvent( 1375 eventNoHistory, child); // enter 1376 eventNoHistory.setAction(action); 1377 1378 handled |= dispatchTransformedGenericPointerEvent( 1379 eventNoHistory, child); // move 1380 } else { 1381 // Send the move as is. 1382 handled |= dispatchTransformedGenericPointerEvent(event, child); 1383 } 1384 } 1385 if (handled) { 1386 break; 1387 } 1388 } 1389 } 1390 } 1391 1392 // Send exit events to all previously hovered children that are no longer hovered. 1393 while (firstOldHoverTarget != null) { 1394 final View child = firstOldHoverTarget.child; 1395 1396 // Exit the old hovered child. 1397 if (action == MotionEvent.ACTION_HOVER_EXIT) { 1398 // Send the exit as is. 1399 handled |= dispatchTransformedGenericPointerEvent( 1400 event, child); // exit 1401 } else { 1402 // Synthesize an exit from a move or enter. 1403 // Ignore the result because hover focus has moved to a different view. 1404 if (action == MotionEvent.ACTION_HOVER_MOVE) { 1405 dispatchTransformedGenericPointerEvent( 1406 event, child); // move 1407 } 1408 eventNoHistory = obtainMotionEventNoHistoryOrSelf(eventNoHistory); 1409 eventNoHistory.setAction(MotionEvent.ACTION_HOVER_EXIT); 1410 dispatchTransformedGenericPointerEvent( 1411 eventNoHistory, child); // exit 1412 eventNoHistory.setAction(action); 1413 } 1414 1415 final HoverTarget nextOldHoverTarget = firstOldHoverTarget.next; 1416 firstOldHoverTarget.recycle(); 1417 firstOldHoverTarget = nextOldHoverTarget; 1418 } 1419 1420 // Send events to the view group itself if no children have handled it. 1421 boolean newHoveredSelf = !handled; 1422 if (newHoveredSelf == mHoveredSelf) { 1423 if (newHoveredSelf) { 1424 // Send event to the view group as before. 1425 handled |= super.dispatchHoverEvent(event); 1426 } 1427 } else { 1428 if (mHoveredSelf) { 1429 // Exit the view group. 1430 if (action == MotionEvent.ACTION_HOVER_EXIT) { 1431 // Send the exit as is. 1432 handled |= super.dispatchHoverEvent(event); // exit 1433 } else { 1434 // Synthesize an exit from a move or enter. 1435 // Ignore the result because hover focus is moving to a different view. 1436 if (action == MotionEvent.ACTION_HOVER_MOVE) { 1437 super.dispatchHoverEvent(event); // move 1438 } 1439 eventNoHistory = obtainMotionEventNoHistoryOrSelf(eventNoHistory); 1440 eventNoHistory.setAction(MotionEvent.ACTION_HOVER_EXIT); 1441 super.dispatchHoverEvent(eventNoHistory); // exit 1442 eventNoHistory.setAction(action); 1443 } 1444 mHoveredSelf = false; 1445 } 1446 1447 if (newHoveredSelf) { 1448 // Enter the view group. 1449 if (action == MotionEvent.ACTION_HOVER_ENTER) { 1450 // Send the enter as is. 1451 handled |= super.dispatchHoverEvent(event); // enter 1452 mHoveredSelf = true; 1453 } else if (action == MotionEvent.ACTION_HOVER_MOVE) { 1454 // Synthesize an enter from a move. 1455 eventNoHistory = obtainMotionEventNoHistoryOrSelf(eventNoHistory); 1456 eventNoHistory.setAction(MotionEvent.ACTION_HOVER_ENTER); 1457 handled |= super.dispatchHoverEvent(eventNoHistory); // enter 1458 eventNoHistory.setAction(action); 1459 1460 handled |= super.dispatchHoverEvent(eventNoHistory); // move 1461 mHoveredSelf = true; 1462 } 1463 } 1464 } 1465 1466 // Recycle the copy of the event that we made. 1467 if (eventNoHistory != event) { 1468 eventNoHistory.recycle(); 1469 } 1470 1471 // Done. 1472 return handled; 1473 } 1474 1475 /** @hide */ 1476 @Override 1477 protected boolean hasHoveredChild() { 1478 return mFirstHoverTarget != null; 1479 } 1480 1481 /** 1482 * Implement this method to intercept hover events before they are handled 1483 * by child views. 1484 * <p> 1485 * This method is called before dispatching a hover event to a child of 1486 * the view group or to the view group's own {@link #onHoverEvent} to allow 1487 * the view group a chance to intercept the hover event. 1488 * This method can also be used to watch all pointer motions that occur within 1489 * the bounds of the view group even when the pointer is hovering over 1490 * a child of the view group rather than over the view group itself. 1491 * </p><p> 1492 * The view group can prevent its children from receiving hover events by 1493 * implementing this method and returning <code>true</code> to indicate 1494 * that it would like to intercept hover events. The view group must 1495 * continuously return <code>true</code> from {@link #onInterceptHoverEvent} 1496 * for as long as it wishes to continue intercepting hover events from 1497 * its children. 1498 * </p><p> 1499 * Interception preserves the invariant that at most one view can be 1500 * hovered at a time by transferring hover focus from the currently hovered 1501 * child to the view group or vice-versa as needed. 1502 * </p><p> 1503 * If this method returns <code>true</code> and a child is already hovered, then the 1504 * child view will first receive a hover exit event and then the view group 1505 * itself will receive a hover enter event in {@link #onHoverEvent}. 1506 * Likewise, if this method had previously returned <code>true</code> to intercept hover 1507 * events and instead returns <code>false</code> while the pointer is hovering 1508 * within the bounds of one of a child, then the view group will first receive a 1509 * hover exit event in {@link #onHoverEvent} and then the hovered child will 1510 * receive a hover enter event. 1511 * </p><p> 1512 * The default implementation always returns false. 1513 * </p> 1514 * 1515 * @param event The motion event that describes the hover. 1516 * @return True if the view group would like to intercept the hover event 1517 * and prevent its children from receiving it. 1518 */ 1519 public boolean onInterceptHoverEvent(MotionEvent event) { 1520 return false; 1521 } 1522 1523 private static MotionEvent obtainMotionEventNoHistoryOrSelf(MotionEvent event) { 1524 if (event.getHistorySize() == 0) { 1525 return event; 1526 } 1527 return MotionEvent.obtainNoHistory(event); 1528 } 1529 1530 /** 1531 * {@inheritDoc} 1532 */ 1533 @Override 1534 protected boolean dispatchGenericPointerEvent(MotionEvent event) { 1535 // Send the event to the child under the pointer. 1536 final int childrenCount = mChildrenCount; 1537 if (childrenCount != 0) { 1538 final View[] children = mChildren; 1539 final float x = event.getX(); 1540 final float y = event.getY(); 1541 1542 for (int i = childrenCount - 1; i >= 0; i--) { 1543 final View child = children[i]; 1544 if (!canViewReceivePointerEvents(child) 1545 || !isTransformedTouchPointInView(x, y, child, null)) { 1546 continue; 1547 } 1548 1549 if (dispatchTransformedGenericPointerEvent(event, child)) { 1550 return true; 1551 } 1552 } 1553 } 1554 1555 // No child handled the event. Send it to this view group. 1556 return super.dispatchGenericPointerEvent(event); 1557 } 1558 1559 /** 1560 * {@inheritDoc} 1561 */ 1562 @Override 1563 protected boolean dispatchGenericFocusedEvent(MotionEvent event) { 1564 // Send the event to the focused child or to this view group if it has focus. 1565 if ((mPrivateFlags & (FOCUSED | HAS_BOUNDS)) == (FOCUSED | HAS_BOUNDS)) { 1566 return super.dispatchGenericFocusedEvent(event); 1567 } else if (mFocused != null && (mFocused.mPrivateFlags & HAS_BOUNDS) == HAS_BOUNDS) { 1568 return mFocused.dispatchGenericMotionEvent(event); 1569 } 1570 return false; 1571 } 1572 1573 /** 1574 * Dispatches a generic pointer event to a child, taking into account 1575 * transformations that apply to the child. 1576 * 1577 * @param event The event to send. 1578 * @param child The view to send the event to. 1579 * @return {@code true} if the child handled the event. 1580 */ 1581 private boolean dispatchTransformedGenericPointerEvent(MotionEvent event, View child) { 1582 final float offsetX = mScrollX - child.mLeft; 1583 final float offsetY = mScrollY - child.mTop; 1584 1585 boolean handled; 1586 if (!child.hasIdentityMatrix()) { 1587 MotionEvent transformedEvent = MotionEvent.obtain(event); 1588 transformedEvent.offsetLocation(offsetX, offsetY); 1589 transformedEvent.transform(child.getInverseMatrix()); 1590 handled = child.dispatchGenericMotionEvent(transformedEvent); 1591 transformedEvent.recycle(); 1592 } else { 1593 event.offsetLocation(offsetX, offsetY); 1594 handled = child.dispatchGenericMotionEvent(event); 1595 event.offsetLocation(-offsetX, -offsetY); 1596 } 1597 return handled; 1598 } 1599 1600 /** 1601 * {@inheritDoc} 1602 */ 1603 @Override 1604 public boolean dispatchTouchEvent(MotionEvent ev) { 1605 if (mInputEventConsistencyVerifier != null) { 1606 mInputEventConsistencyVerifier.onTouchEvent(ev, 1); 1607 } 1608 1609 boolean handled = false; 1610 if (onFilterTouchEventForSecurity(ev)) { 1611 final int action = ev.getAction(); 1612 final int actionMasked = action & MotionEvent.ACTION_MASK; 1613 1614 // Handle an initial down. 1615 if (actionMasked == MotionEvent.ACTION_DOWN) { 1616 // Throw away all previous state when starting a new touch gesture. 1617 // The framework may have dropped the up or cancel event for the previous gesture 1618 // due to an app switch, ANR, or some other state change. 1619 cancelAndClearTouchTargets(ev); 1620 resetTouchState(); 1621 } 1622 1623 // Check for interception. 1624 final boolean intercepted; 1625 if (actionMasked == MotionEvent.ACTION_DOWN 1626 || mFirstTouchTarget != null) { 1627 final boolean disallowIntercept = (mGroupFlags & FLAG_DISALLOW_INTERCEPT) != 0; 1628 if (!disallowIntercept) { 1629 intercepted = onInterceptTouchEvent(ev); 1630 ev.setAction(action); // restore action in case it was changed 1631 } else { 1632 intercepted = false; 1633 } 1634 } else { 1635 // There are no touch targets and this action is not an initial down 1636 // so this view group continues to intercept touches. 1637 intercepted = true; 1638 } 1639 1640 // Check for cancelation. 1641 final boolean canceled = resetCancelNextUpFlag(this) 1642 || actionMasked == MotionEvent.ACTION_CANCEL; 1643 1644 // Update list of touch targets for pointer down, if needed. 1645 final boolean split = (mGroupFlags & FLAG_SPLIT_MOTION_EVENTS) != 0; 1646 TouchTarget newTouchTarget = null; 1647 boolean alreadyDispatchedToNewTouchTarget = false; 1648 if (!canceled && !intercepted) { 1649 if (actionMasked == MotionEvent.ACTION_DOWN 1650 || (split && actionMasked == MotionEvent.ACTION_POINTER_DOWN) 1651 || actionMasked == MotionEvent.ACTION_HOVER_MOVE) { 1652 final int actionIndex = ev.getActionIndex(); // always 0 for down 1653 final int idBitsToAssign = split ? 1 << ev.getPointerId(actionIndex) 1654 : TouchTarget.ALL_POINTER_IDS; 1655 1656 // Clean up earlier touch targets for this pointer id in case they 1657 // have become out of sync. 1658 removePointersFromTouchTargets(idBitsToAssign); 1659 1660 final int childrenCount = mChildrenCount; 1661 if (childrenCount != 0) { 1662 // Find a child that can receive the event. 1663 // Scan children from front to back. 1664 final View[] children = mChildren; 1665 final float x = ev.getX(actionIndex); 1666 final float y = ev.getY(actionIndex); 1667 1668 for (int i = childrenCount - 1; i >= 0; i--) { 1669 final View child = children[i]; 1670 if (!canViewReceivePointerEvents(child) 1671 || !isTransformedTouchPointInView(x, y, child, null)) { 1672 continue; 1673 } 1674 1675 newTouchTarget = getTouchTarget(child); 1676 if (newTouchTarget != null) { 1677 // Child is already receiving touch within its bounds. 1678 // Give it the new pointer in addition to the ones it is handling. 1679 newTouchTarget.pointerIdBits |= idBitsToAssign; 1680 break; 1681 } 1682 1683 resetCancelNextUpFlag(child); 1684 if (dispatchTransformedTouchEvent(ev, false, child, idBitsToAssign)) { 1685 // Child wants to receive touch within its bounds. 1686 mLastTouchDownTime = ev.getDownTime(); 1687 mLastTouchDownIndex = i; 1688 mLastTouchDownX = ev.getX(); 1689 mLastTouchDownY = ev.getY(); 1690 newTouchTarget = addTouchTarget(child, idBitsToAssign); 1691 alreadyDispatchedToNewTouchTarget = true; 1692 break; 1693 } 1694 } 1695 } 1696 1697 if (newTouchTarget == null && mFirstTouchTarget != null) { 1698 // Did not find a child to receive the event. 1699 // Assign the pointer to the least recently added target. 1700 newTouchTarget = mFirstTouchTarget; 1701 while (newTouchTarget.next != null) { 1702 newTouchTarget = newTouchTarget.next; 1703 } 1704 newTouchTarget.pointerIdBits |= idBitsToAssign; 1705 } 1706 } 1707 } 1708 1709 // Dispatch to touch targets. 1710 if (mFirstTouchTarget == null) { 1711 // No touch targets so treat this as an ordinary view. 1712 handled = dispatchTransformedTouchEvent(ev, canceled, null, 1713 TouchTarget.ALL_POINTER_IDS); 1714 } else { 1715 // Dispatch to touch targets, excluding the new touch target if we already 1716 // dispatched to it. Cancel touch targets if necessary. 1717 TouchTarget predecessor = null; 1718 TouchTarget target = mFirstTouchTarget; 1719 while (target != null) { 1720 final TouchTarget next = target.next; 1721 if (alreadyDispatchedToNewTouchTarget && target == newTouchTarget) { 1722 handled = true; 1723 } else { 1724 final boolean cancelChild = resetCancelNextUpFlag(target.child) 1725 || intercepted; 1726 if (dispatchTransformedTouchEvent(ev, cancelChild, 1727 target.child, target.pointerIdBits)) { 1728 handled = true; 1729 } 1730 if (cancelChild) { 1731 if (predecessor == null) { 1732 mFirstTouchTarget = next; 1733 } else { 1734 predecessor.next = next; 1735 } 1736 target.recycle(); 1737 target = next; 1738 continue; 1739 } 1740 } 1741 predecessor = target; 1742 target = next; 1743 } 1744 } 1745 1746 // Update list of touch targets for pointer up or cancel, if needed. 1747 if (canceled 1748 || actionMasked == MotionEvent.ACTION_UP 1749 || actionMasked == MotionEvent.ACTION_HOVER_MOVE) { 1750 resetTouchState(); 1751 } else if (split && actionMasked == MotionEvent.ACTION_POINTER_UP) { 1752 final int actionIndex = ev.getActionIndex(); 1753 final int idBitsToRemove = 1 << ev.getPointerId(actionIndex); 1754 removePointersFromTouchTargets(idBitsToRemove); 1755 } 1756 } 1757 1758 if (!handled && mInputEventConsistencyVerifier != null) { 1759 mInputEventConsistencyVerifier.onUnhandledEvent(ev, 1); 1760 } 1761 return handled; 1762 } 1763 1764 /** 1765 * Resets all touch state in preparation for a new cycle. 1766 */ 1767 private void resetTouchState() { 1768 clearTouchTargets(); 1769 resetCancelNextUpFlag(this); 1770 mGroupFlags &= ~FLAG_DISALLOW_INTERCEPT; 1771 } 1772 1773 /** 1774 * Resets the cancel next up flag. 1775 * Returns true if the flag was previously set. 1776 */ 1777 private boolean resetCancelNextUpFlag(View view) { 1778 if ((view.mPrivateFlags & CANCEL_NEXT_UP_EVENT) != 0) { 1779 view.mPrivateFlags &= ~CANCEL_NEXT_UP_EVENT; 1780 return true; 1781 } 1782 return false; 1783 } 1784 1785 /** 1786 * Clears all touch targets. 1787 */ 1788 private void clearTouchTargets() { 1789 TouchTarget target = mFirstTouchTarget; 1790 if (target != null) { 1791 do { 1792 TouchTarget next = target.next; 1793 target.recycle(); 1794 target = next; 1795 } while (target != null); 1796 mFirstTouchTarget = null; 1797 } 1798 } 1799 1800 /** 1801 * Cancels and clears all touch targets. 1802 */ 1803 private void cancelAndClearTouchTargets(MotionEvent event) { 1804 if (mFirstTouchTarget != null) { 1805 boolean syntheticEvent = false; 1806 if (event == null) { 1807 final long now = SystemClock.uptimeMillis(); 1808 event = MotionEvent.obtain(now, now, 1809 MotionEvent.ACTION_CANCEL, 0.0f, 0.0f, 0); 1810 event.setSource(InputDevice.SOURCE_TOUCHSCREEN); 1811 syntheticEvent = true; 1812 } 1813 1814 for (TouchTarget target = mFirstTouchTarget; target != null; target = target.next) { 1815 resetCancelNextUpFlag(target.child); 1816 dispatchTransformedTouchEvent(event, true, target.child, target.pointerIdBits); 1817 } 1818 clearTouchTargets(); 1819 1820 if (syntheticEvent) { 1821 event.recycle(); 1822 } 1823 } 1824 } 1825 1826 /** 1827 * Gets the touch target for specified child view. 1828 * Returns null if not found. 1829 */ 1830 private TouchTarget getTouchTarget(View child) { 1831 for (TouchTarget target = mFirstTouchTarget; target != null; target = target.next) { 1832 if (target.child == child) { 1833 return target; 1834 } 1835 } 1836 return null; 1837 } 1838 1839 /** 1840 * Adds a touch target for specified child to the beginning of the list. 1841 * Assumes the target child is not already present. 1842 */ 1843 private TouchTarget addTouchTarget(View child, int pointerIdBits) { 1844 TouchTarget target = TouchTarget.obtain(child, pointerIdBits); 1845 target.next = mFirstTouchTarget; 1846 mFirstTouchTarget = target; 1847 return target; 1848 } 1849 1850 /** 1851 * Removes the pointer ids from consideration. 1852 */ 1853 private void removePointersFromTouchTargets(int pointerIdBits) { 1854 TouchTarget predecessor = null; 1855 TouchTarget target = mFirstTouchTarget; 1856 while (target != null) { 1857 final TouchTarget next = target.next; 1858 if ((target.pointerIdBits & pointerIdBits) != 0) { 1859 target.pointerIdBits &= ~pointerIdBits; 1860 if (target.pointerIdBits == 0) { 1861 if (predecessor == null) { 1862 mFirstTouchTarget = next; 1863 } else { 1864 predecessor.next = next; 1865 } 1866 target.recycle(); 1867 target = next; 1868 continue; 1869 } 1870 } 1871 predecessor = target; 1872 target = next; 1873 } 1874 } 1875 1876 /** 1877 * Returns true if a child view can receive pointer events. 1878 * @hide 1879 */ 1880 private static boolean canViewReceivePointerEvents(View child) { 1881 return (child.mViewFlags & VISIBILITY_MASK) == VISIBLE 1882 || child.getAnimation() != null; 1883 } 1884 1885 /** 1886 * Returns true if a child view contains the specified point when transformed 1887 * into its coordinate space. 1888 * Child must not be null. 1889 * @hide 1890 */ 1891 protected boolean isTransformedTouchPointInView(float x, float y, View child, 1892 PointF outLocalPoint) { 1893 float localX = x + mScrollX - child.mLeft; 1894 float localY = y + mScrollY - child.mTop; 1895 if (! child.hasIdentityMatrix() && mAttachInfo != null) { 1896 final float[] localXY = mAttachInfo.mTmpTransformLocation; 1897 localXY[0] = localX; 1898 localXY[1] = localY; 1899 child.getInverseMatrix().mapPoints(localXY); 1900 localX = localXY[0]; 1901 localY = localXY[1]; 1902 } 1903 final boolean isInView = child.pointInView(localX, localY); 1904 if (isInView && outLocalPoint != null) { 1905 outLocalPoint.set(localX, localY); 1906 } 1907 return isInView; 1908 } 1909 1910 /** 1911 * Transforms a motion event into the coordinate space of a particular child view, 1912 * filters out irrelevant pointer ids, and overrides its action if necessary. 1913 * If child is null, assumes the MotionEvent will be sent to this ViewGroup instead. 1914 */ 1915 private boolean dispatchTransformedTouchEvent(MotionEvent event, boolean cancel, 1916 View child, int desiredPointerIdBits) { 1917 final boolean handled; 1918 1919 // Canceling motions is a special case. We don't need to perform any transformations 1920 // or filtering. The important part is the action, not the contents. 1921 final int oldAction = event.getAction(); 1922 if (cancel || oldAction == MotionEvent.ACTION_CANCEL) { 1923 event.setAction(MotionEvent.ACTION_CANCEL); 1924 if (child == null) { 1925 handled = super.dispatchTouchEvent(event); 1926 } else { 1927 handled = child.dispatchTouchEvent(event); 1928 } 1929 event.setAction(oldAction); 1930 return handled; 1931 } 1932 1933 // Calculate the number of pointers to deliver. 1934 final int oldPointerIdBits = event.getPointerIdBits(); 1935 final int newPointerIdBits = oldPointerIdBits & desiredPointerIdBits; 1936 1937 // If for some reason we ended up in an inconsistent state where it looks like we 1938 // might produce a motion event with no pointers in it, then drop the event. 1939 if (newPointerIdBits == 0) { 1940 return false; 1941 } 1942 1943 // If the number of pointers is the same and we don't need to perform any fancy 1944 // irreversible transformations, then we can reuse the motion event for this 1945 // dispatch as long as we are careful to revert any changes we make. 1946 // Otherwise we need to make a copy. 1947 final MotionEvent transformedEvent; 1948 if (newPointerIdBits == oldPointerIdBits) { 1949 if (child == null || child.hasIdentityMatrix()) { 1950 if (child == null) { 1951 handled = super.dispatchTouchEvent(event); 1952 } else { 1953 final float offsetX = mScrollX - child.mLeft; 1954 final float offsetY = mScrollY - child.mTop; 1955 event.offsetLocation(offsetX, offsetY); 1956 1957 handled = child.dispatchTouchEvent(event); 1958 1959 event.offsetLocation(-offsetX, -offsetY); 1960 } 1961 return handled; 1962 } 1963 transformedEvent = MotionEvent.obtain(event); 1964 } else { 1965 transformedEvent = event.split(newPointerIdBits); 1966 } 1967 1968 // Perform any necessary transformations and dispatch. 1969 if (child == null) { 1970 handled = super.dispatchTouchEvent(transformedEvent); 1971 } else { 1972 final float offsetX = mScrollX - child.mLeft; 1973 final float offsetY = mScrollY - child.mTop; 1974 transformedEvent.offsetLocation(offsetX, offsetY); 1975 if (! child.hasIdentityMatrix()) { 1976 transformedEvent.transform(child.getInverseMatrix()); 1977 } 1978 1979 handled = child.dispatchTouchEvent(transformedEvent); 1980 } 1981 1982 // Done. 1983 transformedEvent.recycle(); 1984 return handled; 1985 } 1986 1987 /** 1988 * Enable or disable the splitting of MotionEvents to multiple children during touch event 1989 * dispatch. This behavior is enabled by default for applications that target an 1990 * SDK version of {@link Build.VERSION_CODES#HONEYCOMB} or newer. 1991 * 1992 * <p>When this option is enabled MotionEvents may be split and dispatched to different child 1993 * views depending on where each pointer initially went down. This allows for user interactions 1994 * such as scrolling two panes of content independently, chording of buttons, and performing 1995 * independent gestures on different pieces of content. 1996 * 1997 * @param split <code>true</code> to allow MotionEvents to be split and dispatched to multiple 1998 * child views. <code>false</code> to only allow one child view to be the target of 1999 * any MotionEvent received by this ViewGroup. 2000 */ 2001 public void setMotionEventSplittingEnabled(boolean split) { 2002 // TODO Applications really shouldn't change this setting mid-touch event, 2003 // but perhaps this should handle that case and send ACTION_CANCELs to any child views 2004 // with gestures in progress when this is changed. 2005 if (split) { 2006 mGroupFlags |= FLAG_SPLIT_MOTION_EVENTS; 2007 } else { 2008 mGroupFlags &= ~FLAG_SPLIT_MOTION_EVENTS; 2009 } 2010 } 2011 2012 /** 2013 * Returns true if MotionEvents dispatched to this ViewGroup can be split to multiple children. 2014 * @return true if MotionEvents dispatched to this ViewGroup can be split to multiple children. 2015 */ 2016 public boolean isMotionEventSplittingEnabled() { 2017 return (mGroupFlags & FLAG_SPLIT_MOTION_EVENTS) == FLAG_SPLIT_MOTION_EVENTS; 2018 } 2019 2020 /** 2021 * {@inheritDoc} 2022 */ 2023 public void requestDisallowInterceptTouchEvent(boolean disallowIntercept) { 2024 2025 if (disallowIntercept == ((mGroupFlags & FLAG_DISALLOW_INTERCEPT) != 0)) { 2026 // We're already in this state, assume our ancestors are too 2027 return; 2028 } 2029 2030 if (disallowIntercept) { 2031 mGroupFlags |= FLAG_DISALLOW_INTERCEPT; 2032 } else { 2033 mGroupFlags &= ~FLAG_DISALLOW_INTERCEPT; 2034 } 2035 2036 // Pass it up to our parent 2037 if (mParent != null) { 2038 mParent.requestDisallowInterceptTouchEvent(disallowIntercept); 2039 } 2040 } 2041 2042 /** 2043 * Implement this method to intercept all touch screen motion events. This 2044 * allows you to watch events as they are dispatched to your children, and 2045 * take ownership of the current gesture at any point. 2046 * 2047 * <p>Using this function takes some care, as it has a fairly complicated 2048 * interaction with {@link View#onTouchEvent(MotionEvent) 2049 * View.onTouchEvent(MotionEvent)}, and using it requires implementing 2050 * that method as well as this one in the correct way. Events will be 2051 * received in the following order: 2052 * 2053 * <ol> 2054 * <li> You will receive the down event here. 2055 * <li> The down event will be handled either by a child of this view 2056 * group, or given to your own onTouchEvent() method to handle; this means 2057 * you should implement onTouchEvent() to return true, so you will 2058 * continue to see the rest of the gesture (instead of looking for 2059 * a parent view to handle it). Also, by returning true from 2060 * onTouchEvent(), you will not receive any following 2061 * events in onInterceptTouchEvent() and all touch processing must 2062 * happen in onTouchEvent() like normal. 2063 * <li> For as long as you return false from this function, each following 2064 * event (up to and including the final up) will be delivered first here 2065 * and then to the target's onTouchEvent(). 2066 * <li> If you return true from here, you will not receive any 2067 * following events: the target view will receive the same event but 2068 * with the action {@link MotionEvent#ACTION_CANCEL}, and all further 2069 * events will be delivered to your onTouchEvent() method and no longer 2070 * appear here. 2071 * </ol> 2072 * 2073 * @param ev The motion event being dispatched down the hierarchy. 2074 * @return Return true to steal motion events from the children and have 2075 * them dispatched to this ViewGroup through onTouchEvent(). 2076 * The current target will receive an ACTION_CANCEL event, and no further 2077 * messages will be delivered here. 2078 */ 2079 public boolean onInterceptTouchEvent(MotionEvent ev) { 2080 return false; 2081 } 2082 2083 /** 2084 * {@inheritDoc} 2085 * 2086 * Looks for a view to give focus to respecting the setting specified by 2087 * {@link #getDescendantFocusability()}. 2088 * 2089 * Uses {@link #onRequestFocusInDescendants(int, android.graphics.Rect)} to 2090 * find focus within the children of this group when appropriate. 2091 * 2092 * @see #FOCUS_BEFORE_DESCENDANTS 2093 * @see #FOCUS_AFTER_DESCENDANTS 2094 * @see #FOCUS_BLOCK_DESCENDANTS 2095 * @see #onRequestFocusInDescendants(int, android.graphics.Rect) 2096 */ 2097 @Override 2098 public boolean requestFocus(int direction, Rect previouslyFocusedRect) { 2099 if (DBG) { 2100 System.out.println(this + " ViewGroup.requestFocus direction=" 2101 + direction); 2102 } 2103 int descendantFocusability = getDescendantFocusability(); 2104 2105 switch (descendantFocusability) { 2106 case FOCUS_BLOCK_DESCENDANTS: 2107 return super.requestFocus(direction, previouslyFocusedRect); 2108 case FOCUS_BEFORE_DESCENDANTS: { 2109 final boolean took = super.requestFocus(direction, previouslyFocusedRect); 2110 return took ? took : onRequestFocusInDescendants(direction, previouslyFocusedRect); 2111 } 2112 case FOCUS_AFTER_DESCENDANTS: { 2113 final boolean took = onRequestFocusInDescendants(direction, previouslyFocusedRect); 2114 return took ? took : super.requestFocus(direction, previouslyFocusedRect); 2115 } 2116 default: 2117 throw new IllegalStateException("descendant focusability must be " 2118 + "one of FOCUS_BEFORE_DESCENDANTS, FOCUS_AFTER_DESCENDANTS, FOCUS_BLOCK_DESCENDANTS " 2119 + "but is " + descendantFocusability); 2120 } 2121 } 2122 2123 /** 2124 * Look for a descendant to call {@link View#requestFocus} on. 2125 * Called by {@link ViewGroup#requestFocus(int, android.graphics.Rect)} 2126 * when it wants to request focus within its children. Override this to 2127 * customize how your {@link ViewGroup} requests focus within its children. 2128 * @param direction One of FOCUS_UP, FOCUS_DOWN, FOCUS_LEFT, and FOCUS_RIGHT 2129 * @param previouslyFocusedRect The rectangle (in this View's coordinate system) 2130 * to give a finer grained hint about where focus is coming from. May be null 2131 * if there is no hint. 2132 * @return Whether focus was taken. 2133 */ 2134 @SuppressWarnings({"ConstantConditions"}) 2135 protected boolean onRequestFocusInDescendants(int direction, 2136 Rect previouslyFocusedRect) { 2137 int index; 2138 int increment; 2139 int end; 2140 int count = mChildrenCount; 2141 if ((direction & FOCUS_FORWARD) != 0) { 2142 index = 0; 2143 increment = 1; 2144 end = count; 2145 } else { 2146 index = count - 1; 2147 increment = -1; 2148 end = -1; 2149 } 2150 final View[] children = mChildren; 2151 for (int i = index; i != end; i += increment) { 2152 View child = children[i]; 2153 if ((child.mViewFlags & VISIBILITY_MASK) == VISIBLE) { 2154 if (child.requestFocus(direction, previouslyFocusedRect)) { 2155 return true; 2156 } 2157 } 2158 } 2159 return false; 2160 } 2161 2162 /** 2163 * {@inheritDoc} 2164 * 2165 * @hide 2166 */ 2167 @Override 2168 public void dispatchStartTemporaryDetach() { 2169 super.dispatchStartTemporaryDetach(); 2170 final int count = mChildrenCount; 2171 final View[] children = mChildren; 2172 for (int i = 0; i < count; i++) { 2173 children[i].dispatchStartTemporaryDetach(); 2174 } 2175 } 2176 2177 /** 2178 * {@inheritDoc} 2179 * 2180 * @hide 2181 */ 2182 @Override 2183 public void dispatchFinishTemporaryDetach() { 2184 super.dispatchFinishTemporaryDetach(); 2185 final int count = mChildrenCount; 2186 final View[] children = mChildren; 2187 for (int i = 0; i < count; i++) { 2188 children[i].dispatchFinishTemporaryDetach(); 2189 } 2190 } 2191 2192 /** 2193 * {@inheritDoc} 2194 */ 2195 @Override 2196 void dispatchAttachedToWindow(AttachInfo info, int visibility) { 2197 mGroupFlags |= FLAG_PREVENT_DISPATCH_ATTACHED_TO_WINDOW; 2198 super.dispatchAttachedToWindow(info, visibility); 2199 mGroupFlags &= ~FLAG_PREVENT_DISPATCH_ATTACHED_TO_WINDOW; 2200 2201 visibility |= mViewFlags & VISIBILITY_MASK; 2202 2203 final int count = mChildrenCount; 2204 final View[] children = mChildren; 2205 for (int i = 0; i < count; i++) { 2206 children[i].dispatchAttachedToWindow(info, visibility); 2207 } 2208 } 2209 2210 @Override 2211 boolean dispatchPopulateAccessibilityEventInternal(AccessibilityEvent event) { 2212 boolean handled = super.dispatchPopulateAccessibilityEventInternal(event); 2213 if (handled) { 2214 return handled; 2215 } 2216 // Let our children have a shot in populating the event. 2217 for (int i = 0, count = getChildCount(); i < count; i++) { 2218 View child = getChildAt(i); 2219 if ((child.mViewFlags & VISIBILITY_MASK) == VISIBLE) { 2220 handled = getChildAt(i).dispatchPopulateAccessibilityEvent(event); 2221 if (handled) { 2222 return handled; 2223 } 2224 } 2225 } 2226 return false; 2227 } 2228 2229 @Override 2230 void onInitializeAccessibilityNodeInfoInternal(AccessibilityNodeInfo info) { 2231 super.onInitializeAccessibilityNodeInfoInternal(info); 2232 for (int i = 0, count = mChildrenCount; i < count; i++) { 2233 View child = mChildren[i]; 2234 if ((child.mViewFlags & VISIBILITY_MASK) == VISIBLE 2235 && (child.mPrivateFlags & IS_ROOT_NAMESPACE) == 0) { 2236 info.addChild(child); 2237 } 2238 } 2239 } 2240 2241 /** 2242 * {@inheritDoc} 2243 */ 2244 @Override 2245 void dispatchDetachedFromWindow() { 2246 // If we still have a touch target, we are still in the process of 2247 // dispatching motion events to a child; we need to get rid of that 2248 // child to avoid dispatching events to it after the window is torn 2249 // down. To make sure we keep the child in a consistent state, we 2250 // first send it an ACTION_CANCEL motion event. 2251 cancelAndClearTouchTargets(null); 2252 2253 // In case view is detached while transition is running 2254 mLayoutSuppressed = false; 2255 2256 // Tear down our drag tracking 2257 mDragNotifiedChildren = null; 2258 if (mCurrentDrag != null) { 2259 mCurrentDrag.recycle(); 2260 mCurrentDrag = null; 2261 } 2262 2263 final int count = mChildrenCount; 2264 final View[] children = mChildren; 2265 for (int i = 0; i < count; i++) { 2266 children[i].dispatchDetachedFromWindow(); 2267 } 2268 super.dispatchDetachedFromWindow(); 2269 } 2270 2271 /** 2272 * {@inheritDoc} 2273 */ 2274 @Override 2275 public void setPadding(int left, int top, int right, int bottom) { 2276 super.setPadding(left, top, right, bottom); 2277 2278 if ((mPaddingLeft | mPaddingTop | mPaddingRight | mPaddingBottom) != 0) { 2279 mGroupFlags |= FLAG_PADDING_NOT_NULL; 2280 } else { 2281 mGroupFlags &= ~FLAG_PADDING_NOT_NULL; 2282 } 2283 } 2284 2285 /** 2286 * {@inheritDoc} 2287 */ 2288 @Override 2289 protected void dispatchSaveInstanceState(SparseArray<Parcelable> container) { 2290 super.dispatchSaveInstanceState(container); 2291 final int count = mChildrenCount; 2292 final View[] children = mChildren; 2293 for (int i = 0; i < count; i++) { 2294 View c = children[i]; 2295 if ((c.mViewFlags & PARENT_SAVE_DISABLED_MASK) != PARENT_SAVE_DISABLED) { 2296 c.dispatchSaveInstanceState(container); 2297 } 2298 } 2299 } 2300 2301 /** 2302 * Perform dispatching of a {@link #saveHierarchyState(android.util.SparseArray)} freeze()} 2303 * to only this view, not to its children. For use when overriding 2304 * {@link #dispatchSaveInstanceState(android.util.SparseArray)} dispatchFreeze()} to allow 2305 * subclasses to freeze their own state but not the state of their children. 2306 * 2307 * @param container the container 2308 */ 2309 protected void dispatchFreezeSelfOnly(SparseArray<Parcelable> container) { 2310 super.dispatchSaveInstanceState(container); 2311 } 2312 2313 /** 2314 * {@inheritDoc} 2315 */ 2316 @Override 2317 protected void dispatchRestoreInstanceState(SparseArray<Parcelable> container) { 2318 super.dispatchRestoreInstanceState(container); 2319 final int count = mChildrenCount; 2320 final View[] children = mChildren; 2321 for (int i = 0; i < count; i++) { 2322 View c = children[i]; 2323 if ((c.mViewFlags & PARENT_SAVE_DISABLED_MASK) != PARENT_SAVE_DISABLED) { 2324 c.dispatchRestoreInstanceState(container); 2325 } 2326 } 2327 } 2328 2329 /** 2330 * Perform dispatching of a {@link #restoreHierarchyState(android.util.SparseArray)} 2331 * to only this view, not to its children. For use when overriding 2332 * {@link #dispatchRestoreInstanceState(android.util.SparseArray)} to allow 2333 * subclasses to thaw their own state but not the state of their children. 2334 * 2335 * @param container the container 2336 */ 2337 protected void dispatchThawSelfOnly(SparseArray<Parcelable> container) { 2338 super.dispatchRestoreInstanceState(container); 2339 } 2340 2341 /** 2342 * Enables or disables the drawing cache for each child of this view group. 2343 * 2344 * @param enabled true to enable the cache, false to dispose of it 2345 */ 2346 protected void setChildrenDrawingCacheEnabled(boolean enabled) { 2347 if (enabled || (mPersistentDrawingCache & PERSISTENT_ALL_CACHES) != PERSISTENT_ALL_CACHES) { 2348 final View[] children = mChildren; 2349 final int count = mChildrenCount; 2350 for (int i = 0; i < count; i++) { 2351 children[i].setDrawingCacheEnabled(enabled); 2352 } 2353 } 2354 } 2355 2356 @Override 2357 protected void onAnimationStart() { 2358 super.onAnimationStart(); 2359 2360 // When this ViewGroup's animation starts, build the cache for the children 2361 if ((mGroupFlags & FLAG_ANIMATION_CACHE) == FLAG_ANIMATION_CACHE) { 2362 final int count = mChildrenCount; 2363 final View[] children = mChildren; 2364 final boolean buildCache = !isHardwareAccelerated(); 2365 2366 for (int i = 0; i < count; i++) { 2367 final View child = children[i]; 2368 if ((child.mViewFlags & VISIBILITY_MASK) == VISIBLE) { 2369 child.setDrawingCacheEnabled(true); 2370 if (buildCache) { 2371 child.buildDrawingCache(true); 2372 } 2373 } 2374 } 2375 2376 mGroupFlags |= FLAG_CHILDREN_DRAWN_WITH_CACHE; 2377 } 2378 } 2379 2380 @Override 2381 protected void onAnimationEnd() { 2382 super.onAnimationEnd(); 2383 2384 // When this ViewGroup's animation ends, destroy the cache of the children 2385 if ((mGroupFlags & FLAG_ANIMATION_CACHE) == FLAG_ANIMATION_CACHE) { 2386 mGroupFlags &= ~FLAG_CHILDREN_DRAWN_WITH_CACHE; 2387 2388 if ((mPersistentDrawingCache & PERSISTENT_ANIMATION_CACHE) == 0) { 2389 setChildrenDrawingCacheEnabled(false); 2390 } 2391 } 2392 } 2393 2394 @Override 2395 Bitmap createSnapshot(Bitmap.Config quality, int backgroundColor, boolean skipChildren) { 2396 int count = mChildrenCount; 2397 int[] visibilities = null; 2398 2399 if (skipChildren) { 2400 visibilities = new int[count]; 2401 for (int i = 0; i < count; i++) { 2402 View child = getChildAt(i); 2403 visibilities[i] = child.getVisibility(); 2404 if (visibilities[i] == View.VISIBLE) { 2405 child.setVisibility(INVISIBLE); 2406 } 2407 } 2408 } 2409 2410 Bitmap b = super.createSnapshot(quality, backgroundColor, skipChildren); 2411 2412 if (skipChildren) { 2413 for (int i = 0; i < count; i++) { 2414 getChildAt(i).setVisibility(visibilities[i]); 2415 } 2416 } 2417 2418 return b; 2419 } 2420 2421 /** 2422 * {@inheritDoc} 2423 */ 2424 @Override 2425 protected void dispatchDraw(Canvas canvas) { 2426 final int count = mChildrenCount; 2427 final View[] children = mChildren; 2428 int flags = mGroupFlags; 2429 2430 if ((flags & FLAG_RUN_ANIMATION) != 0 && canAnimate()) { 2431 final boolean cache = (mGroupFlags & FLAG_ANIMATION_CACHE) == FLAG_ANIMATION_CACHE; 2432 2433 final boolean buildCache = !isHardwareAccelerated(); 2434 for (int i = 0; i < count; i++) { 2435 final View child = children[i]; 2436 if ((child.mViewFlags & VISIBILITY_MASK) == VISIBLE) { 2437 final LayoutParams params = child.getLayoutParams(); 2438 attachLayoutAnimationParameters(child, params, i, count); 2439 bindLayoutAnimation(child); 2440 if (cache) { 2441 child.setDrawingCacheEnabled(true); 2442 if (buildCache) { 2443 child.buildDrawingCache(true); 2444 } 2445 } 2446 } 2447 } 2448 2449 final LayoutAnimationController controller = mLayoutAnimationController; 2450 if (controller.willOverlap()) { 2451 mGroupFlags |= FLAG_OPTIMIZE_INVALIDATE; 2452 } 2453 2454 controller.start(); 2455 2456 mGroupFlags &= ~FLAG_RUN_ANIMATION; 2457 mGroupFlags &= ~FLAG_ANIMATION_DONE; 2458 2459 if (cache) { 2460 mGroupFlags |= FLAG_CHILDREN_DRAWN_WITH_CACHE; 2461 } 2462 2463 if (mAnimationListener != null) { 2464 mAnimationListener.onAnimationStart(controller.getAnimation()); 2465 } 2466 } 2467 2468 int saveCount = 0; 2469 final boolean clipToPadding = (flags & CLIP_TO_PADDING_MASK) == CLIP_TO_PADDING_MASK; 2470 if (clipToPadding) { 2471 saveCount = canvas.save(); 2472 canvas.clipRect(mScrollX + mPaddingLeft, mScrollY + mPaddingTop, 2473 mScrollX + mRight - mLeft - mPaddingRight, 2474 mScrollY + mBottom - mTop - mPaddingBottom); 2475 2476 } 2477 2478 // We will draw our child's animation, let's reset the flag 2479 mPrivateFlags &= ~DRAW_ANIMATION; 2480 mGroupFlags &= ~FLAG_INVALIDATE_REQUIRED; 2481 2482 boolean more = false; 2483 final long drawingTime = getDrawingTime(); 2484 2485 if ((flags & FLAG_USE_CHILD_DRAWING_ORDER) == 0) { 2486 for (int i = 0; i < count; i++) { 2487 final View child = children[i]; 2488 if ((child.mViewFlags & VISIBILITY_MASK) == VISIBLE || child.getAnimation() != null) { 2489 more |= drawChild(canvas, child, drawingTime); 2490 } 2491 } 2492 } else { 2493 for (int i = 0; i < count; i++) { 2494 final View child = children[getChildDrawingOrder(count, i)]; 2495 if ((child.mViewFlags & VISIBILITY_MASK) == VISIBLE || child.getAnimation() != null) { 2496 more |= drawChild(canvas, child, drawingTime); 2497 } 2498 } 2499 } 2500 2501 // Draw any disappearing views that have animations 2502 if (mDisappearingChildren != null) { 2503 final ArrayList<View> disappearingChildren = mDisappearingChildren; 2504 final int disappearingCount = disappearingChildren.size() - 1; 2505 // Go backwards -- we may delete as animations finish 2506 for (int i = disappearingCount; i >= 0; i--) { 2507 final View child = disappearingChildren.get(i); 2508 more |= drawChild(canvas, child, drawingTime); 2509 } 2510 } 2511 2512 if (clipToPadding) { 2513 canvas.restoreToCount(saveCount); 2514 } 2515 2516 // mGroupFlags might have been updated by drawChild() 2517 flags = mGroupFlags; 2518 2519 if ((flags & FLAG_INVALIDATE_REQUIRED) == FLAG_INVALIDATE_REQUIRED) { 2520 invalidate(true); 2521 } 2522 2523 if ((flags & FLAG_ANIMATION_DONE) == 0 && (flags & FLAG_NOTIFY_ANIMATION_LISTENER) == 0 && 2524 mLayoutAnimationController.isDone() && !more) { 2525 // We want to erase the drawing cache and notify the listener after the 2526 // next frame is drawn because one extra invalidate() is caused by 2527 // drawChild() after the animation is over 2528 mGroupFlags |= FLAG_NOTIFY_ANIMATION_LISTENER; 2529 final Runnable end = new Runnable() { 2530 public void run() { 2531 notifyAnimationListener(); 2532 } 2533 }; 2534 post(end); 2535 } 2536 } 2537 2538 /** 2539 * Returns the index of the child to draw for this iteration. Override this 2540 * if you want to change the drawing order of children. By default, it 2541 * returns i. 2542 * <p> 2543 * NOTE: In order for this method to be called, you must enable child ordering 2544 * first by calling {@link #setChildrenDrawingOrderEnabled(boolean)}. 2545 * 2546 * @param i The current iteration. 2547 * @return The index of the child to draw this iteration. 2548 * 2549 * @see #setChildrenDrawingOrderEnabled(boolean) 2550 * @see #isChildrenDrawingOrderEnabled() 2551 */ 2552 protected int getChildDrawingOrder(int childCount, int i) { 2553 return i; 2554 } 2555 2556 private void notifyAnimationListener() { 2557 mGroupFlags &= ~FLAG_NOTIFY_ANIMATION_LISTENER; 2558 mGroupFlags |= FLAG_ANIMATION_DONE; 2559 2560 if (mAnimationListener != null) { 2561 final Runnable end = new Runnable() { 2562 public void run() { 2563 mAnimationListener.onAnimationEnd(mLayoutAnimationController.getAnimation()); 2564 } 2565 }; 2566 post(end); 2567 } 2568 2569 if ((mGroupFlags & FLAG_ANIMATION_CACHE) == FLAG_ANIMATION_CACHE) { 2570 mGroupFlags &= ~FLAG_CHILDREN_DRAWN_WITH_CACHE; 2571 if ((mPersistentDrawingCache & PERSISTENT_ANIMATION_CACHE) == 0) { 2572 setChildrenDrawingCacheEnabled(false); 2573 } 2574 } 2575 2576 invalidate(true); 2577 } 2578 2579 /** 2580 * This method is used to cause children of this ViewGroup to restore or recreate their 2581 * display lists. It is called by getDisplayList() when the parent ViewGroup does not need 2582 * to recreate its own display list, which would happen if it went through the normal 2583 * draw/dispatchDraw mechanisms. 2584 * 2585 * @hide 2586 */ 2587 @Override 2588 protected void dispatchGetDisplayList() { 2589 final int count = mChildrenCount; 2590 final View[] children = mChildren; 2591 for (int i = 0; i < count; i++) { 2592 final View child = children[i]; 2593 if (((child.mViewFlags & VISIBILITY_MASK) == VISIBLE || child.getAnimation() != null) && 2594 child.hasStaticLayer()) { 2595 child.mRecreateDisplayList = (child.mPrivateFlags & INVALIDATED) == INVALIDATED; 2596 child.mPrivateFlags &= ~INVALIDATED; 2597 child.getDisplayList(); 2598 child.mRecreateDisplayList = false; 2599 } 2600 } 2601 } 2602 2603 /** 2604 * Draw one child of this View Group. This method is responsible for getting 2605 * the canvas in the right state. This includes clipping, translating so 2606 * that the child's scrolled origin is at 0, 0, and applying any animation 2607 * transformations. 2608 * 2609 * @param canvas The canvas on which to draw the child 2610 * @param child Who to draw 2611 * @param drawingTime The time at which draw is occuring 2612 * @return True if an invalidate() was issued 2613 */ 2614 protected boolean drawChild(Canvas canvas, View child, long drawingTime) { 2615 boolean more = false; 2616 2617 final int cl = child.mLeft; 2618 final int ct = child.mTop; 2619 final int cr = child.mRight; 2620 final int cb = child.mBottom; 2621 2622 final boolean childHasIdentityMatrix = child.hasIdentityMatrix(); 2623 2624 final int flags = mGroupFlags; 2625 2626 if ((flags & FLAG_CLEAR_TRANSFORMATION) == FLAG_CLEAR_TRANSFORMATION) { 2627 mChildTransformation.clear(); 2628 mGroupFlags &= ~FLAG_CLEAR_TRANSFORMATION; 2629 } 2630 2631 Transformation transformToApply = null; 2632 Transformation invalidationTransform; 2633 final Animation a = child.getAnimation(); 2634 boolean concatMatrix = false; 2635 2636 boolean scalingRequired = false; 2637 boolean caching; 2638 int layerType = mDrawLayers ? child.getLayerType() : LAYER_TYPE_NONE; 2639 2640 final boolean hardwareAccelerated = canvas.isHardwareAccelerated(); 2641 if ((flags & FLAG_CHILDREN_DRAWN_WITH_CACHE) == FLAG_CHILDREN_DRAWN_WITH_CACHE || 2642 (flags & FLAG_ALWAYS_DRAWN_WITH_CACHE) == FLAG_ALWAYS_DRAWN_WITH_CACHE) { 2643 caching = true; 2644 if (mAttachInfo != null) scalingRequired = mAttachInfo.mScalingRequired; 2645 } else { 2646 caching = (layerType != LAYER_TYPE_NONE) || hardwareAccelerated; 2647 } 2648 2649 if (a != null) { 2650 final boolean initialized = a.isInitialized(); 2651 if (!initialized) { 2652 a.initialize(cr - cl, cb - ct, getWidth(), getHeight()); 2653 a.initializeInvalidateRegion(0, 0, cr - cl, cb - ct); 2654 child.onAnimationStart(); 2655 } 2656 2657 more = a.getTransformation(drawingTime, mChildTransformation, 2658 scalingRequired ? mAttachInfo.mApplicationScale : 1f); 2659 if (scalingRequired && mAttachInfo.mApplicationScale != 1f) { 2660 if (mInvalidationTransformation == null) { 2661 mInvalidationTransformation = new Transformation(); 2662 } 2663 invalidationTransform = mInvalidationTransformation; 2664 a.getTransformation(drawingTime, invalidationTransform, 1f); 2665 } else { 2666 invalidationTransform = mChildTransformation; 2667 } 2668 transformToApply = mChildTransformation; 2669 2670 concatMatrix = a.willChangeTransformationMatrix(); 2671 2672 if (more) { 2673 if (!a.willChangeBounds()) { 2674 if ((flags & (FLAG_OPTIMIZE_INVALIDATE | FLAG_ANIMATION_DONE)) == 2675 FLAG_OPTIMIZE_INVALIDATE) { 2676 mGroupFlags |= FLAG_INVALIDATE_REQUIRED; 2677 } else if ((flags & FLAG_INVALIDATE_REQUIRED) == 0) { 2678 // The child need to draw an animation, potentially offscreen, so 2679 // make sure we do not cancel invalidate requests 2680 mPrivateFlags |= DRAW_ANIMATION; 2681 invalidate(cl, ct, cr, cb); 2682 } 2683 } else { 2684 if (mInvalidateRegion == null) { 2685 mInvalidateRegion = new RectF(); 2686 } 2687 final RectF region = mInvalidateRegion; 2688 a.getInvalidateRegion(0, 0, cr - cl, cb - ct, region, invalidationTransform); 2689 2690 // The child need to draw an animation, potentially offscreen, so 2691 // make sure we do not cancel invalidate requests 2692 mPrivateFlags |= DRAW_ANIMATION; 2693 2694 final int left = cl + (int) region.left; 2695 final int top = ct + (int) region.top; 2696 invalidate(left, top, left + (int) (region.width() + .5f), 2697 top + (int) (region.height() + .5f)); 2698 } 2699 } 2700 } else if ((flags & FLAG_SUPPORT_STATIC_TRANSFORMATIONS) == 2701 FLAG_SUPPORT_STATIC_TRANSFORMATIONS) { 2702 final boolean hasTransform = getChildStaticTransformation(child, mChildTransformation); 2703 if (hasTransform) { 2704 final int transformType = mChildTransformation.getTransformationType(); 2705 transformToApply = transformType != Transformation.TYPE_IDENTITY ? 2706 mChildTransformation : null; 2707 concatMatrix = (transformType & Transformation.TYPE_MATRIX) != 0; 2708 } 2709 } 2710 2711 concatMatrix |= !childHasIdentityMatrix; 2712 2713 // Sets the flag as early as possible to allow draw() implementations 2714 // to call invalidate() successfully when doing animations 2715 child.mPrivateFlags |= DRAWN; 2716 2717 if (!concatMatrix && canvas.quickReject(cl, ct, cr, cb, Canvas.EdgeType.BW) && 2718 (child.mPrivateFlags & DRAW_ANIMATION) == 0) { 2719 return more; 2720 } 2721 2722 float alpha = child.getAlpha(); 2723 // Bail out early if the view does not need to be drawn 2724 if (alpha <= ViewConfiguration.ALPHA_THRESHOLD && (child.mPrivateFlags & ALPHA_SET) == 0 && 2725 !(child instanceof SurfaceView)) { 2726 return more; 2727 } 2728 2729 if (hardwareAccelerated) { 2730 // Clear INVALIDATED flag to allow invalidation to occur during rendering, but 2731 // retain the flag's value temporarily in the mRecreateDisplayList flag 2732 child.mRecreateDisplayList = (child.mPrivateFlags & INVALIDATED) == INVALIDATED; 2733 child.mPrivateFlags &= ~INVALIDATED; 2734 } 2735 2736 child.computeScroll(); 2737 2738 final int sx = child.mScrollX; 2739 final int sy = child.mScrollY; 2740 2741 DisplayList displayList = null; 2742 Bitmap cache = null; 2743 boolean hasDisplayList = false; 2744 if (caching) { 2745 if (!hardwareAccelerated) { 2746 if (layerType != LAYER_TYPE_NONE) { 2747 layerType = LAYER_TYPE_SOFTWARE; 2748 child.buildDrawingCache(true); 2749 } 2750 cache = child.getDrawingCache(true); 2751 } else { 2752 switch (layerType) { 2753 case LAYER_TYPE_SOFTWARE: 2754 child.buildDrawingCache(true); 2755 cache = child.getDrawingCache(true); 2756 break; 2757 case LAYER_TYPE_NONE: 2758 // Delay getting the display list until animation-driven alpha values are 2759 // set up and possibly passed on to the view 2760 hasDisplayList = child.canHaveDisplayList(); 2761 break; 2762 } 2763 } 2764 } 2765 2766 final boolean hasNoCache = cache == null || hasDisplayList; 2767 final boolean offsetForScroll = cache == null && !hasDisplayList && 2768 layerType != LAYER_TYPE_HARDWARE; 2769 2770 final int restoreTo = canvas.save(); 2771 if (offsetForScroll) { 2772 canvas.translate(cl - sx, ct - sy); 2773 } else { 2774 canvas.translate(cl, ct); 2775 if (scalingRequired) { 2776 // mAttachInfo cannot be null, otherwise scalingRequired == false 2777 final float scale = 1.0f / mAttachInfo.mApplicationScale; 2778 canvas.scale(scale, scale); 2779 } 2780 } 2781 2782 if (transformToApply != null || alpha < 1.0f || !child.hasIdentityMatrix()) { 2783 if (transformToApply != null || !childHasIdentityMatrix) { 2784 int transX = 0; 2785 int transY = 0; 2786 2787 if (offsetForScroll) { 2788 transX = -sx; 2789 transY = -sy; 2790 } 2791 2792 if (transformToApply != null) { 2793 if (concatMatrix) { 2794 // Undo the scroll translation, apply the transformation matrix, 2795 // then redo the scroll translate to get the correct result. 2796 canvas.translate(-transX, -transY); 2797 canvas.concat(transformToApply.getMatrix()); 2798 canvas.translate(transX, transY); 2799 mGroupFlags |= FLAG_CLEAR_TRANSFORMATION; 2800 } 2801 2802 float transformAlpha = transformToApply.getAlpha(); 2803 if (transformAlpha < 1.0f) { 2804 alpha *= transformToApply.getAlpha(); 2805 mGroupFlags |= FLAG_CLEAR_TRANSFORMATION; 2806 } 2807 } 2808 2809 if (!childHasIdentityMatrix) { 2810 canvas.translate(-transX, -transY); 2811 canvas.concat(child.getMatrix()); 2812 canvas.translate(transX, transY); 2813 } 2814 } 2815 2816 if (alpha < 1.0f) { 2817 mGroupFlags |= FLAG_CLEAR_TRANSFORMATION; 2818 if (hasNoCache) { 2819 final int multipliedAlpha = (int) (255 * alpha); 2820 if (!child.onSetAlpha(multipliedAlpha)) { 2821 int layerFlags = Canvas.HAS_ALPHA_LAYER_SAVE_FLAG; 2822 if ((flags & FLAG_CLIP_CHILDREN) == FLAG_CLIP_CHILDREN || 2823 layerType != LAYER_TYPE_NONE) { 2824 layerFlags |= Canvas.CLIP_TO_LAYER_SAVE_FLAG; 2825 } 2826 if (layerType == LAYER_TYPE_NONE) { 2827 final int scrollX = hasDisplayList ? 0 : sx; 2828 final int scrollY = hasDisplayList ? 0 : sy; 2829 canvas.saveLayerAlpha(scrollX, scrollY, scrollX + cr - cl, 2830 scrollY + cb - ct, multipliedAlpha, layerFlags); 2831 } 2832 } else { 2833 // Alpha is handled by the child directly, clobber the layer's alpha 2834 child.mPrivateFlags |= ALPHA_SET; 2835 } 2836 } 2837 } 2838 } else if ((child.mPrivateFlags & ALPHA_SET) == ALPHA_SET) { 2839 child.onSetAlpha(255); 2840 child.mPrivateFlags &= ~ALPHA_SET; 2841 } 2842 2843 if ((flags & FLAG_CLIP_CHILDREN) == FLAG_CLIP_CHILDREN) { 2844 if (offsetForScroll) { 2845 canvas.clipRect(sx, sy, sx + (cr - cl), sy + (cb - ct)); 2846 } else { 2847 if (!scalingRequired || cache == null) { 2848 canvas.clipRect(0, 0, cr - cl, cb - ct); 2849 } else { 2850 canvas.clipRect(0, 0, cache.getWidth(), cache.getHeight()); 2851 } 2852 } 2853 } 2854 2855 if (hasDisplayList) { 2856 displayList = child.getDisplayList(); 2857 if (!displayList.isValid()) { 2858 // Uncommon, but possible. If a view is removed from the hierarchy during the call 2859 // to getDisplayList(), the display list will be marked invalid and we should not 2860 // try to use it again. 2861 displayList = null; 2862 hasDisplayList = false; 2863 } 2864 } 2865 2866 if (hasNoCache) { 2867 boolean layerRendered = false; 2868 if (layerType == LAYER_TYPE_HARDWARE) { 2869 final HardwareLayer layer = child.getHardwareLayer(); 2870 if (layer != null && layer.isValid()) { 2871 child.mLayerPaint.setAlpha((int) (alpha * 255)); 2872 ((HardwareCanvas) canvas).drawHardwareLayer(layer, 0, 0, child.mLayerPaint); 2873 layerRendered = true; 2874 } else { 2875 final int scrollX = hasDisplayList ? 0 : sx; 2876 final int scrollY = hasDisplayList ? 0 : sy; 2877 canvas.saveLayer(scrollX, scrollY, 2878 scrollX + cr - cl, scrollY + cb - ct, child.mLayerPaint, 2879 Canvas.HAS_ALPHA_LAYER_SAVE_FLAG | Canvas.CLIP_TO_LAYER_SAVE_FLAG); 2880 } 2881 } 2882 2883 if (!layerRendered) { 2884 if (!hasDisplayList) { 2885 // Fast path for layouts with no backgrounds 2886 if ((child.mPrivateFlags & SKIP_DRAW) == SKIP_DRAW) { 2887 if (ViewDebug.TRACE_HIERARCHY) { 2888 ViewDebug.trace(this, ViewDebug.HierarchyTraceType.DRAW); 2889 } 2890 child.mPrivateFlags &= ~DIRTY_MASK; 2891 child.dispatchDraw(canvas); 2892 } else { 2893 child.draw(canvas); 2894 } 2895 } else { 2896 child.mPrivateFlags &= ~DIRTY_MASK; 2897 ((HardwareCanvas) canvas).drawDisplayList(displayList, cr - cl, cb - ct, null); 2898 } 2899 } 2900 } else if (cache != null) { 2901 child.mPrivateFlags &= ~DIRTY_MASK; 2902 Paint cachePaint; 2903 2904 if (layerType == LAYER_TYPE_NONE) { 2905 cachePaint = mCachePaint; 2906 if (cachePaint == null) { 2907 cachePaint = new Paint(); 2908 cachePaint.setDither(false); 2909 mCachePaint = cachePaint; 2910 } 2911 if (alpha < 1.0f) { 2912 cachePaint.setAlpha((int) (alpha * 255)); 2913 mGroupFlags |= FLAG_ALPHA_LOWER_THAN_ONE; 2914 } else if ((flags & FLAG_ALPHA_LOWER_THAN_ONE) == FLAG_ALPHA_LOWER_THAN_ONE) { 2915 cachePaint.setAlpha(255); 2916 mGroupFlags &= ~FLAG_ALPHA_LOWER_THAN_ONE; 2917 } 2918 } else { 2919 cachePaint = child.mLayerPaint; 2920 cachePaint.setAlpha((int) (alpha * 255)); 2921 } 2922 canvas.drawBitmap(cache, 0.0f, 0.0f, cachePaint); 2923 } 2924 2925 canvas.restoreToCount(restoreTo); 2926 2927 if (a != null && !more) { 2928 if (!hardwareAccelerated && !a.getFillAfter()) { 2929 child.onSetAlpha(255); 2930 } 2931 finishAnimatingView(child, a); 2932 } 2933 2934 if (more && hardwareAccelerated) { 2935 // invalidation is the trigger to recreate display lists, so if we're using 2936 // display lists to render, force an invalidate to allow the animation to 2937 // continue drawing another frame 2938 invalidate(true); 2939 if (a.hasAlpha() && (child.mPrivateFlags & ALPHA_SET) == ALPHA_SET) { 2940 // alpha animations should cause the child to recreate its display list 2941 child.invalidate(true); 2942 } 2943 } 2944 2945 child.mRecreateDisplayList = false; 2946 2947 return more; 2948 } 2949 2950 /** 2951 * 2952 * @param enabled True if children should be drawn with layers, false otherwise. 2953 * 2954 * @hide 2955 */ 2956 public void setChildrenLayersEnabled(boolean enabled) { 2957 if (enabled != mDrawLayers) { 2958 mDrawLayers = enabled; 2959 invalidate(true); 2960 2961 // We need to invalidate any child with a layer. For instance, 2962 // if a child is backed by a hardware layer and we disable layers 2963 // the child is marked as not dirty (flags cleared the last time 2964 // the child was drawn inside its layer.) However, that child might 2965 // never have created its own display list or have an obsolete 2966 // display list. By invalidating the child we ensure the display 2967 // list is in sync with the content of the hardware layer. 2968 for (int i = 0; i < mChildrenCount; i++) { 2969 View child = mChildren[i]; 2970 if (child.mLayerType != LAYER_TYPE_NONE) { 2971 child.invalidate(true); 2972 } 2973 } 2974 } 2975 } 2976 2977 /** 2978 * By default, children are clipped to their bounds before drawing. This 2979 * allows view groups to override this behavior for animations, etc. 2980 * 2981 * @param clipChildren true to clip children to their bounds, 2982 * false otherwise 2983 * @attr ref android.R.styleable#ViewGroup_clipChildren 2984 */ 2985 public void setClipChildren(boolean clipChildren) { 2986 setBooleanFlag(FLAG_CLIP_CHILDREN, clipChildren); 2987 } 2988 2989 /** 2990 * By default, children are clipped to the padding of the ViewGroup. This 2991 * allows view groups to override this behavior 2992 * 2993 * @param clipToPadding true to clip children to the padding of the 2994 * group, false otherwise 2995 * @attr ref android.R.styleable#ViewGroup_clipToPadding 2996 */ 2997 public void setClipToPadding(boolean clipToPadding) { 2998 setBooleanFlag(FLAG_CLIP_TO_PADDING, clipToPadding); 2999 } 3000 3001 /** 3002 * {@inheritDoc} 3003 */ 3004 @Override 3005 public void dispatchSetSelected(boolean selected) { 3006 final View[] children = mChildren; 3007 final int count = mChildrenCount; 3008 for (int i = 0; i < count; i++) { 3009 children[i].setSelected(selected); 3010 } 3011 } 3012 3013 /** 3014 * {@inheritDoc} 3015 */ 3016 @Override 3017 public void dispatchSetActivated(boolean activated) { 3018 final View[] children = mChildren; 3019 final int count = mChildrenCount; 3020 for (int i = 0; i < count; i++) { 3021 children[i].setActivated(activated); 3022 } 3023 } 3024 3025 @Override 3026 protected void dispatchSetPressed(boolean pressed) { 3027 final View[] children = mChildren; 3028 final int count = mChildrenCount; 3029 for (int i = 0; i < count; i++) { 3030 children[i].setPressed(pressed); 3031 } 3032 } 3033 3034 /** 3035 * When this property is set to true, this ViewGroup supports static transformations on 3036 * children; this causes 3037 * {@link #getChildStaticTransformation(View, android.view.animation.Transformation)} to be 3038 * invoked when a child is drawn. 3039 * 3040 * Any subclass overriding 3041 * {@link #getChildStaticTransformation(View, android.view.animation.Transformation)} should 3042 * set this property to true. 3043 * 3044 * @param enabled True to enable static transformations on children, false otherwise. 3045 * 3046 * @see #FLAG_SUPPORT_STATIC_TRANSFORMATIONS 3047 */ 3048 protected void setStaticTransformationsEnabled(boolean enabled) { 3049 setBooleanFlag(FLAG_SUPPORT_STATIC_TRANSFORMATIONS, enabled); 3050 } 3051 3052 /** 3053 * {@inheritDoc} 3054 * 3055 * @see #setStaticTransformationsEnabled(boolean) 3056 */ 3057 protected boolean getChildStaticTransformation(View child, Transformation t) { 3058 return false; 3059 } 3060 3061 /** 3062 * {@hide} 3063 */ 3064 @Override 3065 protected View findViewTraversal(int id) { 3066 if (id == mID) { 3067 return this; 3068 } 3069 3070 final View[] where = mChildren; 3071 final int len = mChildrenCount; 3072 3073 for (int i = 0; i < len; i++) { 3074 View v = where[i]; 3075 3076 if ((v.mPrivateFlags & IS_ROOT_NAMESPACE) == 0) { 3077 v = v.findViewById(id); 3078 3079 if (v != null) { 3080 return v; 3081 } 3082 } 3083 } 3084 3085 return null; 3086 } 3087 3088 /** 3089 * {@hide} 3090 */ 3091 @Override 3092 protected View findViewWithTagTraversal(Object tag) { 3093 if (tag != null && tag.equals(mTag)) { 3094 return this; 3095 } 3096 3097 final View[] where = mChildren; 3098 final int len = mChildrenCount; 3099 3100 for (int i = 0; i < len; i++) { 3101 View v = where[i]; 3102 3103 if ((v.mPrivateFlags & IS_ROOT_NAMESPACE) == 0) { 3104 v = v.findViewWithTag(tag); 3105 3106 if (v != null) { 3107 return v; 3108 } 3109 } 3110 } 3111 3112 return null; 3113 } 3114 3115 /** 3116 * {@hide} 3117 */ 3118 @Override 3119 protected View findViewByPredicateTraversal(Predicate<View> predicate, View childToSkip) { 3120 if (predicate.apply(this)) { 3121 return this; 3122 } 3123 3124 final View[] where = mChildren; 3125 final int len = mChildrenCount; 3126 3127 for (int i = 0; i < len; i++) { 3128 View v = where[i]; 3129 3130 if (v != childToSkip && (v.mPrivateFlags & IS_ROOT_NAMESPACE) == 0) { 3131 v = v.findViewByPredicate(predicate); 3132 3133 if (v != null) { 3134 return v; 3135 } 3136 } 3137 } 3138 3139 return null; 3140 } 3141 3142 /** 3143 * Adds a child view. If no layout parameters are already set on the child, the 3144 * default parameters for this ViewGroup are set on the child. 3145 * 3146 * @param child the child view to add 3147 * 3148 * @see #generateDefaultLayoutParams() 3149 */ 3150 public void addView(View child) { 3151 addView(child, -1); 3152 } 3153 3154 /** 3155 * Adds a child view. If no layout parameters are already set on the child, the 3156 * default parameters for this ViewGroup are set on the child. 3157 * 3158 * @param child the child view to add 3159 * @param index the position at which to add the child 3160 * 3161 * @see #generateDefaultLayoutParams() 3162 */ 3163 public void addView(View child, int index) { 3164 LayoutParams params = child.getLayoutParams(); 3165 if (params == null) { 3166 params = generateDefaultLayoutParams(); 3167 if (params == null) { 3168 throw new IllegalArgumentException("generateDefaultLayoutParams() cannot return null"); 3169 } 3170 } 3171 addView(child, index, params); 3172 } 3173 3174 /** 3175 * Adds a child view with this ViewGroup's default layout parameters and the 3176 * specified width and height. 3177 * 3178 * @param child the child view to add 3179 */ 3180 public void addView(View child, int width, int height) { 3181 final LayoutParams params = generateDefaultLayoutParams(); 3182 params.width = width; 3183 params.height = height; 3184 addView(child, -1, params); 3185 } 3186 3187 /** 3188 * Adds a child view with the specified layout parameters. 3189 * 3190 * @param child the child view to add 3191 * @param params the layout parameters to set on the child 3192 */ 3193 public void addView(View child, LayoutParams params) { 3194 addView(child, -1, params); 3195 } 3196 3197 /** 3198 * Adds a child view with the specified layout parameters. 3199 * 3200 * @param child the child view to add 3201 * @param index the position at which to add the child 3202 * @param params the layout parameters to set on the child 3203 */ 3204 public void addView(View child, int index, LayoutParams params) { 3205 if (DBG) { 3206 System.out.println(this + " addView"); 3207 } 3208 3209 // addViewInner() will call child.requestLayout() when setting the new LayoutParams 3210 // therefore, we call requestLayout() on ourselves before, so that the child's request 3211 // will be blocked at our level 3212 requestLayout(); 3213 invalidate(true); 3214 addViewInner(child, index, params, false); 3215 } 3216 3217 /** 3218 * {@inheritDoc} 3219 */ 3220 public void updateViewLayout(View view, ViewGroup.LayoutParams params) { 3221 if (!checkLayoutParams(params)) { 3222 throw new IllegalArgumentException("Invalid LayoutParams supplied to " + this); 3223 } 3224 if (view.mParent != this) { 3225 throw new IllegalArgumentException("Given view not a child of " + this); 3226 } 3227 view.setLayoutParams(params); 3228 } 3229 3230 /** 3231 * {@inheritDoc} 3232 */ 3233 protected boolean checkLayoutParams(ViewGroup.LayoutParams p) { 3234 return p != null; 3235 } 3236 3237 /** 3238 * Interface definition for a callback to be invoked when the hierarchy 3239 * within this view changed. The hierarchy changes whenever a child is added 3240 * to or removed from this view. 3241 */ 3242 public interface OnHierarchyChangeListener { 3243 /** 3244 * Called when a new child is added to a parent view. 3245 * 3246 * @param parent the view in which a child was added 3247 * @param child the new child view added in the hierarchy 3248 */ 3249 void onChildViewAdded(View parent, View child); 3250 3251 /** 3252 * Called when a child is removed from a parent view. 3253 * 3254 * @param parent the view from which the child was removed 3255 * @param child the child removed from the hierarchy 3256 */ 3257 void onChildViewRemoved(View parent, View child); 3258 } 3259 3260 /** 3261 * Register a callback to be invoked when a child is added to or removed 3262 * from this view. 3263 * 3264 * @param listener the callback to invoke on hierarchy change 3265 */ 3266 public void setOnHierarchyChangeListener(OnHierarchyChangeListener listener) { 3267 mOnHierarchyChangeListener = listener; 3268 } 3269 3270 /** 3271 * @hide 3272 */ 3273 protected void onViewAdded(View child) { 3274 if (mOnHierarchyChangeListener != null) { 3275 mOnHierarchyChangeListener.onChildViewAdded(this, child); 3276 } 3277 } 3278 3279 /** 3280 * @hide 3281 */ 3282 protected void onViewRemoved(View child) { 3283 if (mOnHierarchyChangeListener != null) { 3284 mOnHierarchyChangeListener.onChildViewRemoved(this, child); 3285 } 3286 } 3287 3288 /** 3289 * Adds a view during layout. This is useful if in your onLayout() method, 3290 * you need to add more views (as does the list view for example). 3291 * 3292 * If index is negative, it means put it at the end of the list. 3293 * 3294 * @param child the view to add to the group 3295 * @param index the index at which the child must be added 3296 * @param params the layout parameters to associate with the child 3297 * @return true if the child was added, false otherwise 3298 */ 3299 protected boolean addViewInLayout(View child, int index, LayoutParams params) { 3300 return addViewInLayout(child, index, params, false); 3301 } 3302 3303 /** 3304 * Adds a view during layout. This is useful if in your onLayout() method, 3305 * you need to add more views (as does the list view for example). 3306 * 3307 * If index is negative, it means put it at the end of the list. 3308 * 3309 * @param child the view to add to the group 3310 * @param index the index at which the child must be added 3311 * @param params the layout parameters to associate with the child 3312 * @param preventRequestLayout if true, calling this method will not trigger a 3313 * layout request on child 3314 * @return true if the child was added, false otherwise 3315 */ 3316 protected boolean addViewInLayout(View child, int index, LayoutParams params, 3317 boolean preventRequestLayout) { 3318 child.mParent = null; 3319 addViewInner(child, index, params, preventRequestLayout); 3320 child.mPrivateFlags = (child.mPrivateFlags & ~DIRTY_MASK) | DRAWN; 3321 return true; 3322 } 3323 3324 /** 3325 * Prevents the specified child to be laid out during the next layout pass. 3326 * 3327 * @param child the child on which to perform the cleanup 3328 */ 3329 protected void cleanupLayoutState(View child) { 3330 child.mPrivateFlags &= ~View.FORCE_LAYOUT; 3331 } 3332 3333 private void addViewInner(View child, int index, LayoutParams params, 3334 boolean preventRequestLayout) { 3335 3336 if (mTransition != null) { 3337 // Don't prevent other add transitions from completing, but cancel remove 3338 // transitions to let them complete the process before we add to the container 3339 mTransition.cancel(LayoutTransition.DISAPPEARING); 3340 } 3341 3342 if (child.getParent() != null) { 3343 throw new IllegalStateException("The specified child already has a parent. " + 3344 "You must call removeView() on the child's parent first."); 3345 } 3346 3347 if (mTransition != null) { 3348 mTransition.addChild(this, child); 3349 } 3350 3351 if (!checkLayoutParams(params)) { 3352 params = generateLayoutParams(params); 3353 } 3354 3355 if (preventRequestLayout) { 3356 child.mLayoutParams = params; 3357 } else { 3358 child.setLayoutParams(params); 3359 } 3360 3361 if (index < 0) { 3362 index = mChildrenCount; 3363 } 3364 3365 addInArray(child, index); 3366 3367 // tell our children 3368 if (preventRequestLayout) { 3369 child.assignParent(this); 3370 } else { 3371 child.mParent = this; 3372 } 3373 3374 if (child.hasFocus()) { 3375 requestChildFocus(child, child.findFocus()); 3376 } 3377 3378 AttachInfo ai = mAttachInfo; 3379 if (ai != null && (mGroupFlags & FLAG_PREVENT_DISPATCH_ATTACHED_TO_WINDOW) == 0) { 3380 boolean lastKeepOn = ai.mKeepScreenOn; 3381 ai.mKeepScreenOn = false; 3382 child.dispatchAttachedToWindow(mAttachInfo, (mViewFlags&VISIBILITY_MASK)); 3383 if (ai.mKeepScreenOn) { 3384 needGlobalAttributesUpdate(true); 3385 } 3386 ai.mKeepScreenOn = lastKeepOn; 3387 } 3388 3389 onViewAdded(child); 3390 3391 if ((child.mViewFlags & DUPLICATE_PARENT_STATE) == DUPLICATE_PARENT_STATE) { 3392 mGroupFlags |= FLAG_NOTIFY_CHILDREN_ON_DRAWABLE_STATE_CHANGE; 3393 } 3394 } 3395 3396 private void addInArray(View child, int index) { 3397 View[] children = mChildren; 3398 final int count = mChildrenCount; 3399 final int size = children.length; 3400 if (index == count) { 3401 if (size == count) { 3402 mChildren = new View[size + ARRAY_CAPACITY_INCREMENT]; 3403 System.arraycopy(children, 0, mChildren, 0, size); 3404 children = mChildren; 3405 } 3406 children[mChildrenCount++] = child; 3407 } else if (index < count) { 3408 if (size == count) { 3409 mChildren = new View[size + ARRAY_CAPACITY_INCREMENT]; 3410 System.arraycopy(children, 0, mChildren, 0, index); 3411 System.arraycopy(children, index, mChildren, index + 1, count - index); 3412 children = mChildren; 3413 } else { 3414 System.arraycopy(children, index, children, index + 1, count - index); 3415 } 3416 children[index] = child; 3417 mChildrenCount++; 3418 if (mLastTouchDownIndex >= index) { 3419 mLastTouchDownIndex++; 3420 } 3421 } else { 3422 throw new IndexOutOfBoundsException("index=" + index + " count=" + count); 3423 } 3424 } 3425 3426 // This method also sets the child's mParent to null 3427 private void removeFromArray(int index) { 3428 final View[] children = mChildren; 3429 if (!(mTransitioningViews != null && mTransitioningViews.contains(children[index]))) { 3430 children[index].mParent = null; 3431 } 3432 final int count = mChildrenCount; 3433 if (index == count - 1) { 3434 children[--mChildrenCount] = null; 3435 } else if (index >= 0 && index < count) { 3436 System.arraycopy(children, index + 1, children, index, count - index - 1); 3437 children[--mChildrenCount] = null; 3438 } else { 3439 throw new IndexOutOfBoundsException(); 3440 } 3441 if (mLastTouchDownIndex == index) { 3442 mLastTouchDownTime = 0; 3443 mLastTouchDownIndex = -1; 3444 } else if (mLastTouchDownIndex > index) { 3445 mLastTouchDownIndex--; 3446 } 3447 } 3448 3449 // This method also sets the children's mParent to null 3450 private void removeFromArray(int start, int count) { 3451 final View[] children = mChildren; 3452 final int childrenCount = mChildrenCount; 3453 3454 start = Math.max(0, start); 3455 final int end = Math.min(childrenCount, start + count); 3456 3457 if (start == end) { 3458 return; 3459 } 3460 3461 if (end == childrenCount) { 3462 for (int i = start; i < end; i++) { 3463 children[i].mParent = null; 3464 children[i] = null; 3465 } 3466 } else { 3467 for (int i = start; i < end; i++) { 3468 children[i].mParent = null; 3469 } 3470 3471 // Since we're looping above, we might as well do the copy, but is arraycopy() 3472 // faster than the extra 2 bounds checks we would do in the loop? 3473 System.arraycopy(children, end, children, start, childrenCount - end); 3474 3475 for (int i = childrenCount - (end - start); i < childrenCount; i++) { 3476 children[i] = null; 3477 } 3478 } 3479 3480 mChildrenCount -= (end - start); 3481 } 3482 3483 private void bindLayoutAnimation(View child) { 3484 Animation a = mLayoutAnimationController.getAnimationForView(child); 3485 child.setAnimation(a); 3486 } 3487 3488 /** 3489 * Subclasses should override this method to set layout animation 3490 * parameters on the supplied child. 3491 * 3492 * @param child the child to associate with animation parameters 3493 * @param params the child's layout parameters which hold the animation 3494 * parameters 3495 * @param index the index of the child in the view group 3496 * @param count the number of children in the view group 3497 */ 3498 protected void attachLayoutAnimationParameters(View child, 3499 LayoutParams params, int index, int count) { 3500 LayoutAnimationController.AnimationParameters animationParams = 3501 params.layoutAnimationParameters; 3502 if (animationParams == null) { 3503 animationParams = new LayoutAnimationController.AnimationParameters(); 3504 params.layoutAnimationParameters = animationParams; 3505 } 3506 3507 animationParams.count = count; 3508 animationParams.index = index; 3509 } 3510 3511 /** 3512 * {@inheritDoc} 3513 */ 3514 public void removeView(View view) { 3515 removeViewInternal(view); 3516 requestLayout(); 3517 invalidate(true); 3518 } 3519 3520 /** 3521 * Removes a view during layout. This is useful if in your onLayout() method, 3522 * you need to remove more views. 3523 * 3524 * @param view the view to remove from the group 3525 */ 3526 public void removeViewInLayout(View view) { 3527 removeViewInternal(view); 3528 } 3529 3530 /** 3531 * Removes a range of views during layout. This is useful if in your onLayout() method, 3532 * you need to remove more views. 3533 * 3534 * @param start the index of the first view to remove from the group 3535 * @param count the number of views to remove from the group 3536 */ 3537 public void removeViewsInLayout(int start, int count) { 3538 removeViewsInternal(start, count); 3539 } 3540 3541 /** 3542 * Removes the view at the specified position in the group. 3543 * 3544 * @param index the position in the group of the view to remove 3545 */ 3546 public void removeViewAt(int index) { 3547 removeViewInternal(index, getChildAt(index)); 3548 requestLayout(); 3549 invalidate(true); 3550 } 3551 3552 /** 3553 * Removes the specified range of views from the group. 3554 * 3555 * @param start the first position in the group of the range of views to remove 3556 * @param count the number of views to remove 3557 */ 3558 public void removeViews(int start, int count) { 3559 removeViewsInternal(start, count); 3560 requestLayout(); 3561 invalidate(true); 3562 } 3563 3564 private void removeViewInternal(View view) { 3565 final int index = indexOfChild(view); 3566 if (index >= 0) { 3567 removeViewInternal(index, view); 3568 } 3569 } 3570 3571 private void removeViewInternal(int index, View view) { 3572 3573 if (mTransition != null) { 3574 mTransition.removeChild(this, view); 3575 } 3576 3577 boolean clearChildFocus = false; 3578 if (view == mFocused) { 3579 view.clearFocusForRemoval(); 3580 clearChildFocus = true; 3581 } 3582 3583 if (view.getAnimation() != null || 3584 (mTransitioningViews != null && mTransitioningViews.contains(view))) { 3585 addDisappearingView(view); 3586 } else if (view.mAttachInfo != null) { 3587 view.dispatchDetachedFromWindow(); 3588 } 3589 3590 onViewRemoved(view); 3591 3592 needGlobalAttributesUpdate(false); 3593 3594 removeFromArray(index); 3595 3596 if (clearChildFocus) { 3597 clearChildFocus(view); 3598 } 3599 } 3600 3601 /** 3602 * Sets the LayoutTransition object for this ViewGroup. If the LayoutTransition object is 3603 * not null, changes in layout which occur because of children being added to or removed from 3604 * the ViewGroup will be animated according to the animations defined in that LayoutTransition 3605 * object. By default, the transition object is null (so layout changes are not animated). 3606 * 3607 * @param transition The LayoutTransition object that will animated changes in layout. A value 3608 * of <code>null</code> means no transition will run on layout changes. 3609 * @attr ref android.R.styleable#ViewGroup_animateLayoutChanges 3610 */ 3611 public void setLayoutTransition(LayoutTransition transition) { 3612 if (mTransition != null) { 3613 mTransition.removeTransitionListener(mLayoutTransitionListener); 3614 } 3615 mTransition = transition; 3616 if (mTransition != null) { 3617 mTransition.addTransitionListener(mLayoutTransitionListener); 3618 } 3619 } 3620 3621 /** 3622 * Gets the LayoutTransition object for this ViewGroup. If the LayoutTransition object is 3623 * not null, changes in layout which occur because of children being added to or removed from 3624 * the ViewGroup will be animated according to the animations defined in that LayoutTransition 3625 * object. By default, the transition object is null (so layout changes are not animated). 3626 * 3627 * @return LayoutTranstion The LayoutTransition object that will animated changes in layout. 3628 * A value of <code>null</code> means no transition will run on layout changes. 3629 */ 3630 public LayoutTransition getLayoutTransition() { 3631 return mTransition; 3632 } 3633 3634 private void removeViewsInternal(int start, int count) { 3635 final View focused = mFocused; 3636 final boolean detach = mAttachInfo != null; 3637 View clearChildFocus = null; 3638 3639 final View[] children = mChildren; 3640 final int end = start + count; 3641 3642 for (int i = start; i < end; i++) { 3643 final View view = children[i]; 3644 3645 if (mTransition != null) { 3646 mTransition.removeChild(this, view); 3647 } 3648 3649 if (view == focused) { 3650 view.clearFocusForRemoval(); 3651 clearChildFocus = view; 3652 } 3653 3654 if (view.getAnimation() != null || 3655 (mTransitioningViews != null && mTransitioningViews.contains(view))) { 3656 addDisappearingView(view); 3657 } else if (detach) { 3658 view.dispatchDetachedFromWindow(); 3659 } 3660 3661 needGlobalAttributesUpdate(false); 3662 3663 onViewRemoved(view); 3664 } 3665 3666 removeFromArray(start, count); 3667 3668 if (clearChildFocus != null) { 3669 clearChildFocus(clearChildFocus); 3670 } 3671 } 3672 3673 /** 3674 * Call this method to remove all child views from the 3675 * ViewGroup. 3676 */ 3677 public void removeAllViews() { 3678 removeAllViewsInLayout(); 3679 requestLayout(); 3680 invalidate(true); 3681 } 3682 3683 /** 3684 * Called by a ViewGroup subclass to remove child views from itself, 3685 * when it must first know its size on screen before it can calculate how many 3686 * child views it will render. An example is a Gallery or a ListView, which 3687 * may "have" 50 children, but actually only render the number of children 3688 * that can currently fit inside the object on screen. Do not call 3689 * this method unless you are extending ViewGroup and understand the 3690 * view measuring and layout pipeline. 3691 */ 3692 public void removeAllViewsInLayout() { 3693 final int count = mChildrenCount; 3694 if (count <= 0) { 3695 return; 3696 } 3697 3698 final View[] children = mChildren; 3699 mChildrenCount = 0; 3700 3701 final View focused = mFocused; 3702 final boolean detach = mAttachInfo != null; 3703 View clearChildFocus = null; 3704 3705 needGlobalAttributesUpdate(false); 3706 3707 for (int i = count - 1; i >= 0; i--) { 3708 final View view = children[i]; 3709 3710 if (mTransition != null) { 3711 mTransition.removeChild(this, view); 3712 } 3713 3714 if (view == focused) { 3715 view.clearFocusForRemoval(); 3716 clearChildFocus = view; 3717 } 3718 3719 if (view.getAnimation() != null || 3720 (mTransitioningViews != null && mTransitioningViews.contains(view))) { 3721 addDisappearingView(view); 3722 } else if (detach) { 3723 view.dispatchDetachedFromWindow(); 3724 } 3725 3726 onViewRemoved(view); 3727 3728 view.mParent = null; 3729 children[i] = null; 3730 } 3731 3732 if (clearChildFocus != null) { 3733 clearChildFocus(clearChildFocus); 3734 } 3735 } 3736 3737 /** 3738 * Finishes the removal of a detached view. This method will dispatch the detached from 3739 * window event and notify the hierarchy change listener. 3740 * 3741 * @param child the child to be definitely removed from the view hierarchy 3742 * @param animate if true and the view has an animation, the view is placed in the 3743 * disappearing views list, otherwise, it is detached from the window 3744 * 3745 * @see #attachViewToParent(View, int, android.view.ViewGroup.LayoutParams) 3746 * @see #detachAllViewsFromParent() 3747 * @see #detachViewFromParent(View) 3748 * @see #detachViewFromParent(int) 3749 */ 3750 protected void removeDetachedView(View child, boolean animate) { 3751 if (mTransition != null) { 3752 mTransition.removeChild(this, child); 3753 } 3754 3755 if (child == mFocused) { 3756 child.clearFocus(); 3757 } 3758 3759 if ((animate && child.getAnimation() != null) || 3760 (mTransitioningViews != null && mTransitioningViews.contains(child))) { 3761 addDisappearingView(child); 3762 } else if (child.mAttachInfo != null) { 3763 child.dispatchDetachedFromWindow(); 3764 } 3765 3766 onViewRemoved(child); 3767 } 3768 3769 /** 3770 * Attaches a view to this view group. Attaching a view assigns this group as the parent, 3771 * sets the layout parameters and puts the view in the list of children so it can be retrieved 3772 * by calling {@link #getChildAt(int)}. 3773 * 3774 * This method should be called only for view which were detached from their parent. 3775 * 3776 * @param child the child to attach 3777 * @param index the index at which the child should be attached 3778 * @param params the layout parameters of the child 3779 * 3780 * @see #removeDetachedView(View, boolean) 3781 * @see #detachAllViewsFromParent() 3782 * @see #detachViewFromParent(View) 3783 * @see #detachViewFromParent(int) 3784 */ 3785 protected void attachViewToParent(View child, int index, LayoutParams params) { 3786 child.mLayoutParams = params; 3787 3788 if (index < 0) { 3789 index = mChildrenCount; 3790 } 3791 3792 addInArray(child, index); 3793 3794 child.mParent = this; 3795 child.mPrivateFlags = (child.mPrivateFlags & ~DIRTY_MASK & ~DRAWING_CACHE_VALID) | 3796 DRAWN | INVALIDATED; 3797 this.mPrivateFlags |= INVALIDATED; 3798 3799 if (child.hasFocus()) { 3800 requestChildFocus(child, child.findFocus()); 3801 } 3802 } 3803 3804 /** 3805 * Detaches a view from its parent. Detaching a view should be temporary and followed 3806 * either by a call to {@link #attachViewToParent(View, int, android.view.ViewGroup.LayoutParams)} 3807 * or a call to {@link #removeDetachedView(View, boolean)}. When a view is detached, 3808 * its parent is null and cannot be retrieved by a call to {@link #getChildAt(int)}. 3809 * 3810 * @param child the child to detach 3811 * 3812 * @see #detachViewFromParent(int) 3813 * @see #detachViewsFromParent(int, int) 3814 * @see #detachAllViewsFromParent() 3815 * @see #attachViewToParent(View, int, android.view.ViewGroup.LayoutParams) 3816 * @see #removeDetachedView(View, boolean) 3817 */ 3818 protected void detachViewFromParent(View child) { 3819 removeFromArray(indexOfChild(child)); 3820 } 3821 3822 /** 3823 * Detaches a view from its parent. Detaching a view should be temporary and followed 3824 * either by a call to {@link #attachViewToParent(View, int, android.view.ViewGroup.LayoutParams)} 3825 * or a call to {@link #removeDetachedView(View, boolean)}. When a view is detached, 3826 * its parent is null and cannot be retrieved by a call to {@link #getChildAt(int)}. 3827 * 3828 * @param index the index of the child to detach 3829 * 3830 * @see #detachViewFromParent(View) 3831 * @see #detachAllViewsFromParent() 3832 * @see #detachViewsFromParent(int, int) 3833 * @see #attachViewToParent(View, int, android.view.ViewGroup.LayoutParams) 3834 * @see #removeDetachedView(View, boolean) 3835 */ 3836 protected void detachViewFromParent(int index) { 3837 removeFromArray(index); 3838 } 3839 3840 /** 3841 * Detaches a range of view from their parent. Detaching a view should be temporary and followed 3842 * either by a call to {@link #attachViewToParent(View, int, android.view.ViewGroup.LayoutParams)} 3843 * or a call to {@link #removeDetachedView(View, boolean)}. When a view is detached, its 3844 * parent is null and cannot be retrieved by a call to {@link #getChildAt(int)}. 3845 * 3846 * @param start the first index of the childrend range to detach 3847 * @param count the number of children to detach 3848 * 3849 * @see #detachViewFromParent(View) 3850 * @see #detachViewFromParent(int) 3851 * @see #detachAllViewsFromParent() 3852 * @see #attachViewToParent(View, int, android.view.ViewGroup.LayoutParams) 3853 * @see #removeDetachedView(View, boolean) 3854 */ 3855 protected void detachViewsFromParent(int start, int count) { 3856 removeFromArray(start, count); 3857 } 3858 3859 /** 3860 * Detaches all views from the parent. Detaching a view should be temporary and followed 3861 * either by a call to {@link #attachViewToParent(View, int, android.view.ViewGroup.LayoutParams)} 3862 * or a call to {@link #removeDetachedView(View, boolean)}. When a view is detached, 3863 * its parent is null and cannot be retrieved by a call to {@link #getChildAt(int)}. 3864 * 3865 * @see #detachViewFromParent(View) 3866 * @see #detachViewFromParent(int) 3867 * @see #detachViewsFromParent(int, int) 3868 * @see #attachViewToParent(View, int, android.view.ViewGroup.LayoutParams) 3869 * @see #removeDetachedView(View, boolean) 3870 */ 3871 protected void detachAllViewsFromParent() { 3872 final int count = mChildrenCount; 3873 if (count <= 0) { 3874 return; 3875 } 3876 3877 final View[] children = mChildren; 3878 mChildrenCount = 0; 3879 3880 for (int i = count - 1; i >= 0; i--) { 3881 children[i].mParent = null; 3882 children[i] = null; 3883 } 3884 } 3885 3886 /** 3887 * Don't call or override this method. It is used for the implementation of 3888 * the view hierarchy. 3889 */ 3890 public final void invalidateChild(View child, final Rect dirty) { 3891 if (ViewDebug.TRACE_HIERARCHY) { 3892 ViewDebug.trace(this, ViewDebug.HierarchyTraceType.INVALIDATE_CHILD); 3893 } 3894 3895 ViewParent parent = this; 3896 3897 final AttachInfo attachInfo = mAttachInfo; 3898 if (attachInfo != null) { 3899 // If the child is drawing an animation, we want to copy this flag onto 3900 // ourselves and the parent to make sure the invalidate request goes 3901 // through 3902 final boolean drawAnimation = (child.mPrivateFlags & DRAW_ANIMATION) == DRAW_ANIMATION; 3903 3904 if (dirty == null) { 3905 if (child.mLayerType != LAYER_TYPE_NONE) { 3906 mPrivateFlags |= INVALIDATED; 3907 mPrivateFlags &= ~DRAWING_CACHE_VALID; 3908 child.mLocalDirtyRect.setEmpty(); 3909 } 3910 do { 3911 View view = null; 3912 if (parent instanceof View) { 3913 view = (View) parent; 3914 if (view.mLayerType != LAYER_TYPE_NONE) { 3915 view.mLocalDirtyRect.setEmpty(); 3916 if (view.getParent() instanceof View) { 3917 final View grandParent = (View) view.getParent(); 3918 grandParent.mPrivateFlags |= INVALIDATED; 3919 grandParent.mPrivateFlags &= ~DRAWING_CACHE_VALID; 3920 } 3921 } 3922 if ((view.mPrivateFlags & DIRTY_MASK) != 0) { 3923 // already marked dirty - we're done 3924 break; 3925 } 3926 } 3927 3928 if (drawAnimation) { 3929 if (view != null) { 3930 view.mPrivateFlags |= DRAW_ANIMATION; 3931 } else if (parent instanceof ViewRootImpl) { 3932 ((ViewRootImpl) parent).mIsAnimating = true; 3933 } 3934 } 3935 3936 if (parent instanceof ViewRootImpl) { 3937 ((ViewRootImpl) parent).invalidate(); 3938 parent = null; 3939 } else if (view != null) { 3940 if ((view.mPrivateFlags & DRAWN) == DRAWN || 3941 (view.mPrivateFlags & DRAWING_CACHE_VALID) == DRAWING_CACHE_VALID) { 3942 view.mPrivateFlags &= ~DRAWING_CACHE_VALID; 3943 view.mPrivateFlags |= DIRTY; 3944 parent = view.mParent; 3945 } else { 3946 parent = null; 3947 } 3948 } 3949 } while (parent != null); 3950 } else { 3951 // Check whether the child that requests the invalidate is fully opaque 3952 final boolean isOpaque = child.isOpaque() && !drawAnimation && 3953 child.getAnimation() == null; 3954 // Mark the child as dirty, using the appropriate flag 3955 // Make sure we do not set both flags at the same time 3956 int opaqueFlag = isOpaque ? DIRTY_OPAQUE : DIRTY; 3957 3958 if (child.mLayerType != LAYER_TYPE_NONE) { 3959 mPrivateFlags |= INVALIDATED; 3960 mPrivateFlags &= ~DRAWING_CACHE_VALID; 3961 child.mLocalDirtyRect.union(dirty); 3962 } 3963 3964 final int[] location = attachInfo.mInvalidateChildLocation; 3965 location[CHILD_LEFT_INDEX] = child.mLeft; 3966 location[CHILD_TOP_INDEX] = child.mTop; 3967 Matrix childMatrix = child.getMatrix(); 3968 if (!childMatrix.isIdentity()) { 3969 RectF boundingRect = attachInfo.mTmpTransformRect; 3970 boundingRect.set(dirty); 3971 //boundingRect.inset(-0.5f, -0.5f); 3972 childMatrix.mapRect(boundingRect); 3973 dirty.set((int) (boundingRect.left - 0.5f), 3974 (int) (boundingRect.top - 0.5f), 3975 (int) (boundingRect.right + 0.5f), 3976 (int) (boundingRect.bottom + 0.5f)); 3977 } 3978 3979 do { 3980 View view = null; 3981 if (parent instanceof View) { 3982 view = (View) parent; 3983 if (view.mLayerType != LAYER_TYPE_NONE && 3984 view.getParent() instanceof View) { 3985 final View grandParent = (View) view.getParent(); 3986 grandParent.mPrivateFlags |= INVALIDATED; 3987 grandParent.mPrivateFlags &= ~DRAWING_CACHE_VALID; 3988 } 3989 } 3990 3991 if (drawAnimation) { 3992 if (view != null) { 3993 view.mPrivateFlags |= DRAW_ANIMATION; 3994 } else if (parent instanceof ViewRootImpl) { 3995 ((ViewRootImpl) parent).mIsAnimating = true; 3996 } 3997 } 3998 3999 // If the parent is dirty opaque or not dirty, mark it dirty with the opaque 4000 // flag coming from the child that initiated the invalidate 4001 if (view != null) { 4002 if ((view.mViewFlags & FADING_EDGE_MASK) != 0 && 4003 view.getSolidColor() == 0) { 4004 opaqueFlag = DIRTY; 4005 } 4006 if ((view.mPrivateFlags & DIRTY_MASK) != DIRTY) { 4007 view.mPrivateFlags = (view.mPrivateFlags & ~DIRTY_MASK) | opaqueFlag; 4008 } 4009 } 4010 4011 parent = parent.invalidateChildInParent(location, dirty); 4012 if (view != null) { 4013 // Account for transform on current parent 4014 Matrix m = view.getMatrix(); 4015 if (!m.isIdentity()) { 4016 RectF boundingRect = attachInfo.mTmpTransformRect; 4017 boundingRect.set(dirty); 4018 m.mapRect(boundingRect); 4019 dirty.set((int) boundingRect.left, (int) boundingRect.top, 4020 (int) (boundingRect.right + 0.5f), 4021 (int) (boundingRect.bottom + 0.5f)); 4022 } 4023 } 4024 } while (parent != null); 4025 } 4026 } 4027 } 4028 4029 /** 4030 * Don't call or override this method. It is used for the implementation of 4031 * the view hierarchy. 4032 * 4033 * This implementation returns null if this ViewGroup does not have a parent, 4034 * if this ViewGroup is already fully invalidated or if the dirty rectangle 4035 * does not intersect with this ViewGroup's bounds. 4036 */ 4037 public ViewParent invalidateChildInParent(final int[] location, final Rect dirty) { 4038 if (ViewDebug.TRACE_HIERARCHY) { 4039 ViewDebug.trace(this, ViewDebug.HierarchyTraceType.INVALIDATE_CHILD_IN_PARENT); 4040 } 4041 4042 if ((mPrivateFlags & DRAWN) == DRAWN || 4043 (mPrivateFlags & DRAWING_CACHE_VALID) == DRAWING_CACHE_VALID) { 4044 if ((mGroupFlags & (FLAG_OPTIMIZE_INVALIDATE | FLAG_ANIMATION_DONE)) != 4045 FLAG_OPTIMIZE_INVALIDATE) { 4046 dirty.offset(location[CHILD_LEFT_INDEX] - mScrollX, 4047 location[CHILD_TOP_INDEX] - mScrollY); 4048 4049 final int left = mLeft; 4050 final int top = mTop; 4051 4052 if ((mGroupFlags & FLAG_CLIP_CHILDREN) != FLAG_CLIP_CHILDREN || 4053 dirty.intersect(0, 0, mRight - left, mBottom - top) || 4054 (mPrivateFlags & DRAW_ANIMATION) == DRAW_ANIMATION) { 4055 mPrivateFlags &= ~DRAWING_CACHE_VALID; 4056 4057 location[CHILD_LEFT_INDEX] = left; 4058 location[CHILD_TOP_INDEX] = top; 4059 4060 if (mLayerType != LAYER_TYPE_NONE) { 4061 mLocalDirtyRect.union(dirty); 4062 } 4063 4064 return mParent; 4065 } 4066 } else { 4067 mPrivateFlags &= ~DRAWN & ~DRAWING_CACHE_VALID; 4068 4069 location[CHILD_LEFT_INDEX] = mLeft; 4070 location[CHILD_TOP_INDEX] = mTop; 4071 if ((mGroupFlags & FLAG_CLIP_CHILDREN) == FLAG_CLIP_CHILDREN) { 4072 dirty.set(0, 0, mRight - mLeft, mBottom - mTop); 4073 } else { 4074 // in case the dirty rect extends outside the bounds of this container 4075 dirty.union(0, 0, mRight - mLeft, mBottom - mTop); 4076 } 4077 4078 if (mLayerType != LAYER_TYPE_NONE) { 4079 mLocalDirtyRect.union(dirty); 4080 } 4081 4082 return mParent; 4083 } 4084 } 4085 4086 return null; 4087 } 4088 4089 /** 4090 * Offset a rectangle that is in a descendant's coordinate 4091 * space into our coordinate space. 4092 * @param descendant A descendant of this view 4093 * @param rect A rectangle defined in descendant's coordinate space. 4094 */ 4095 public final void offsetDescendantRectToMyCoords(View descendant, Rect rect) { 4096 offsetRectBetweenParentAndChild(descendant, rect, true, false); 4097 } 4098 4099 /** 4100 * Offset a rectangle that is in our coordinate space into an ancestor's 4101 * coordinate space. 4102 * @param descendant A descendant of this view 4103 * @param rect A rectangle defined in descendant's coordinate space. 4104 */ 4105 public final void offsetRectIntoDescendantCoords(View descendant, Rect rect) { 4106 offsetRectBetweenParentAndChild(descendant, rect, false, false); 4107 } 4108 4109 /** 4110 * Helper method that offsets a rect either from parent to descendant or 4111 * descendant to parent. 4112 */ 4113 void offsetRectBetweenParentAndChild(View descendant, Rect rect, 4114 boolean offsetFromChildToParent, boolean clipToBounds) { 4115 4116 // already in the same coord system :) 4117 if (descendant == this) { 4118 return; 4119 } 4120 4121 ViewParent theParent = descendant.mParent; 4122 4123 // search and offset up to the parent 4124 while ((theParent != null) 4125 && (theParent instanceof View) 4126 && (theParent != this)) { 4127 4128 if (offsetFromChildToParent) { 4129 rect.offset(descendant.mLeft - descendant.mScrollX, 4130 descendant.mTop - descendant.mScrollY); 4131 if (clipToBounds) { 4132 View p = (View) theParent; 4133 rect.intersect(0, 0, p.mRight - p.mLeft, p.mBottom - p.mTop); 4134 } 4135 } else { 4136 if (clipToBounds) { 4137 View p = (View) theParent; 4138 rect.intersect(0, 0, p.mRight - p.mLeft, p.mBottom - p.mTop); 4139 } 4140 rect.offset(descendant.mScrollX - descendant.mLeft, 4141 descendant.mScrollY - descendant.mTop); 4142 } 4143 4144 descendant = (View) theParent; 4145 theParent = descendant.mParent; 4146 } 4147 4148 // now that we are up to this view, need to offset one more time 4149 // to get into our coordinate space 4150 if (theParent == this) { 4151 if (offsetFromChildToParent) { 4152 rect.offset(descendant.mLeft - descendant.mScrollX, 4153 descendant.mTop - descendant.mScrollY); 4154 } else { 4155 rect.offset(descendant.mScrollX - descendant.mLeft, 4156 descendant.mScrollY - descendant.mTop); 4157 } 4158 } else { 4159 throw new IllegalArgumentException("parameter must be a descendant of this view"); 4160 } 4161 } 4162 4163 /** 4164 * Offset the vertical location of all children of this view by the specified number of pixels. 4165 * 4166 * @param offset the number of pixels to offset 4167 * 4168 * @hide 4169 */ 4170 public void offsetChildrenTopAndBottom(int offset) { 4171 final int count = mChildrenCount; 4172 final View[] children = mChildren; 4173 4174 for (int i = 0; i < count; i++) { 4175 final View v = children[i]; 4176 v.mTop += offset; 4177 v.mBottom += offset; 4178 } 4179 } 4180 4181 /** 4182 * {@inheritDoc} 4183 */ 4184 public boolean getChildVisibleRect(View child, Rect r, android.graphics.Point offset) { 4185 int dx = child.mLeft - mScrollX; 4186 int dy = child.mTop - mScrollY; 4187 if (offset != null) { 4188 offset.x += dx; 4189 offset.y += dy; 4190 } 4191 r.offset(dx, dy); 4192 return r.intersect(0, 0, mRight - mLeft, mBottom - mTop) && 4193 (mParent == null || mParent.getChildVisibleRect(this, r, offset)); 4194 } 4195 4196 /** 4197 * {@inheritDoc} 4198 */ 4199 @Override 4200 public final void layout(int l, int t, int r, int b) { 4201 if (mTransition == null || !mTransition.isChangingLayout()) { 4202 super.layout(l, t, r, b); 4203 } else { 4204 // record the fact that we noop'd it; request layout when transition finishes 4205 mLayoutSuppressed = true; 4206 } 4207 } 4208 4209 /** 4210 * {@inheritDoc} 4211 */ 4212 @Override 4213 protected abstract void onLayout(boolean changed, 4214 int l, int t, int r, int b); 4215 4216 /** 4217 * Indicates whether the view group has the ability to animate its children 4218 * after the first layout. 4219 * 4220 * @return true if the children can be animated, false otherwise 4221 */ 4222 protected boolean canAnimate() { 4223 return mLayoutAnimationController != null; 4224 } 4225 4226 /** 4227 * Runs the layout animation. Calling this method triggers a relayout of 4228 * this view group. 4229 */ 4230 public void startLayoutAnimation() { 4231 if (mLayoutAnimationController != null) { 4232 mGroupFlags |= FLAG_RUN_ANIMATION; 4233 requestLayout(); 4234 } 4235 } 4236 4237 /** 4238 * Schedules the layout animation to be played after the next layout pass 4239 * of this view group. This can be used to restart the layout animation 4240 * when the content of the view group changes or when the activity is 4241 * paused and resumed. 4242 */ 4243 public void scheduleLayoutAnimation() { 4244 mGroupFlags |= FLAG_RUN_ANIMATION; 4245 } 4246 4247 /** 4248 * Sets the layout animation controller used to animate the group's 4249 * children after the first layout. 4250 * 4251 * @param controller the animation controller 4252 */ 4253 public void setLayoutAnimation(LayoutAnimationController controller) { 4254 mLayoutAnimationController = controller; 4255 if (mLayoutAnimationController != null) { 4256 mGroupFlags |= FLAG_RUN_ANIMATION; 4257 } 4258 } 4259 4260 /** 4261 * Returns the layout animation controller used to animate the group's 4262 * children. 4263 * 4264 * @return the current animation controller 4265 */ 4266 public LayoutAnimationController getLayoutAnimation() { 4267 return mLayoutAnimationController; 4268 } 4269 4270 /** 4271 * Indicates whether the children's drawing cache is used during a layout 4272 * animation. By default, the drawing cache is enabled but this will prevent 4273 * nested layout animations from working. To nest animations, you must disable 4274 * the cache. 4275 * 4276 * @return true if the animation cache is enabled, false otherwise 4277 * 4278 * @see #setAnimationCacheEnabled(boolean) 4279 * @see View#setDrawingCacheEnabled(boolean) 4280 */ 4281 @ViewDebug.ExportedProperty 4282 public boolean isAnimationCacheEnabled() { 4283 return (mGroupFlags & FLAG_ANIMATION_CACHE) == FLAG_ANIMATION_CACHE; 4284 } 4285 4286 /** 4287 * Enables or disables the children's drawing cache during a layout animation. 4288 * By default, the drawing cache is enabled but this will prevent nested 4289 * layout animations from working. To nest animations, you must disable the 4290 * cache. 4291 * 4292 * @param enabled true to enable the animation cache, false otherwise 4293 * 4294 * @see #isAnimationCacheEnabled() 4295 * @see View#setDrawingCacheEnabled(boolean) 4296 */ 4297 public void setAnimationCacheEnabled(boolean enabled) { 4298 setBooleanFlag(FLAG_ANIMATION_CACHE, enabled); 4299 } 4300 4301 /** 4302 * Indicates whether this ViewGroup will always try to draw its children using their 4303 * drawing cache. By default this property is enabled. 4304 * 4305 * @return true if the animation cache is enabled, false otherwise 4306 * 4307 * @see #setAlwaysDrawnWithCacheEnabled(boolean) 4308 * @see #setChildrenDrawnWithCacheEnabled(boolean) 4309 * @see View#setDrawingCacheEnabled(boolean) 4310 */ 4311 @ViewDebug.ExportedProperty(category = "drawing") 4312 public boolean isAlwaysDrawnWithCacheEnabled() { 4313 return (mGroupFlags & FLAG_ALWAYS_DRAWN_WITH_CACHE) == FLAG_ALWAYS_DRAWN_WITH_CACHE; 4314 } 4315 4316 /** 4317 * Indicates whether this ViewGroup will always try to draw its children using their 4318 * drawing cache. This property can be set to true when the cache rendering is 4319 * slightly different from the children's normal rendering. Renderings can be different, 4320 * for instance, when the cache's quality is set to low. 4321 * 4322 * When this property is disabled, the ViewGroup will use the drawing cache of its 4323 * children only when asked to. It's usually the task of subclasses to tell ViewGroup 4324 * when to start using the drawing cache and when to stop using it. 4325 * 4326 * @param always true to always draw with the drawing cache, false otherwise 4327 * 4328 * @see #isAlwaysDrawnWithCacheEnabled() 4329 * @see #setChildrenDrawnWithCacheEnabled(boolean) 4330 * @see View#setDrawingCacheEnabled(boolean) 4331 * @see View#setDrawingCacheQuality(int) 4332 */ 4333 public void setAlwaysDrawnWithCacheEnabled(boolean always) { 4334 setBooleanFlag(FLAG_ALWAYS_DRAWN_WITH_CACHE, always); 4335 } 4336 4337 /** 4338 * Indicates whether the ViewGroup is currently drawing its children using 4339 * their drawing cache. 4340 * 4341 * @return true if children should be drawn with their cache, false otherwise 4342 * 4343 * @see #setAlwaysDrawnWithCacheEnabled(boolean) 4344 * @see #setChildrenDrawnWithCacheEnabled(boolean) 4345 */ 4346 @ViewDebug.ExportedProperty(category = "drawing") 4347 protected boolean isChildrenDrawnWithCacheEnabled() { 4348 return (mGroupFlags & FLAG_CHILDREN_DRAWN_WITH_CACHE) == FLAG_CHILDREN_DRAWN_WITH_CACHE; 4349 } 4350 4351 /** 4352 * Tells the ViewGroup to draw its children using their drawing cache. This property 4353 * is ignored when {@link #isAlwaysDrawnWithCacheEnabled()} is true. A child's drawing cache 4354 * will be used only if it has been enabled. 4355 * 4356 * Subclasses should call this method to start and stop using the drawing cache when 4357 * they perform performance sensitive operations, like scrolling or animating. 4358 * 4359 * @param enabled true if children should be drawn with their cache, false otherwise 4360 * 4361 * @see #setAlwaysDrawnWithCacheEnabled(boolean) 4362 * @see #isChildrenDrawnWithCacheEnabled() 4363 */ 4364 protected void setChildrenDrawnWithCacheEnabled(boolean enabled) { 4365 setBooleanFlag(FLAG_CHILDREN_DRAWN_WITH_CACHE, enabled); 4366 } 4367 4368 /** 4369 * Indicates whether the ViewGroup is drawing its children in the order defined by 4370 * {@link #getChildDrawingOrder(int, int)}. 4371 * 4372 * @return true if children drawing order is defined by {@link #getChildDrawingOrder(int, int)}, 4373 * false otherwise 4374 * 4375 * @see #setChildrenDrawingOrderEnabled(boolean) 4376 * @see #getChildDrawingOrder(int, int) 4377 */ 4378 @ViewDebug.ExportedProperty(category = "drawing") 4379 protected boolean isChildrenDrawingOrderEnabled() { 4380 return (mGroupFlags & FLAG_USE_CHILD_DRAWING_ORDER) == FLAG_USE_CHILD_DRAWING_ORDER; 4381 } 4382 4383 /** 4384 * Tells the ViewGroup whether to draw its children in the order defined by the method 4385 * {@link #getChildDrawingOrder(int, int)}. 4386 * 4387 * @param enabled true if the order of the children when drawing is determined by 4388 * {@link #getChildDrawingOrder(int, int)}, false otherwise 4389 * 4390 * @see #isChildrenDrawingOrderEnabled() 4391 * @see #getChildDrawingOrder(int, int) 4392 */ 4393 protected void setChildrenDrawingOrderEnabled(boolean enabled) { 4394 setBooleanFlag(FLAG_USE_CHILD_DRAWING_ORDER, enabled); 4395 } 4396 4397 private void setBooleanFlag(int flag, boolean value) { 4398 if (value) { 4399 mGroupFlags |= flag; 4400 } else { 4401 mGroupFlags &= ~flag; 4402 } 4403 } 4404 4405 /** 4406 * Returns an integer indicating what types of drawing caches are kept in memory. 4407 * 4408 * @see #setPersistentDrawingCache(int) 4409 * @see #setAnimationCacheEnabled(boolean) 4410 * 4411 * @return one or a combination of {@link #PERSISTENT_NO_CACHE}, 4412 * {@link #PERSISTENT_ANIMATION_CACHE}, {@link #PERSISTENT_SCROLLING_CACHE} 4413 * and {@link #PERSISTENT_ALL_CACHES} 4414 */ 4415 @ViewDebug.ExportedProperty(category = "drawing", mapping = { 4416 @ViewDebug.IntToString(from = PERSISTENT_NO_CACHE, to = "NONE"), 4417 @ViewDebug.IntToString(from = PERSISTENT_ANIMATION_CACHE, to = "ANIMATION"), 4418 @ViewDebug.IntToString(from = PERSISTENT_SCROLLING_CACHE, to = "SCROLLING"), 4419 @ViewDebug.IntToString(from = PERSISTENT_ALL_CACHES, to = "ALL") 4420 }) 4421 public int getPersistentDrawingCache() { 4422 return mPersistentDrawingCache; 4423 } 4424 4425 /** 4426 * Indicates what types of drawing caches should be kept in memory after 4427 * they have been created. 4428 * 4429 * @see #getPersistentDrawingCache() 4430 * @see #setAnimationCacheEnabled(boolean) 4431 * 4432 * @param drawingCacheToKeep one or a combination of {@link #PERSISTENT_NO_CACHE}, 4433 * {@link #PERSISTENT_ANIMATION_CACHE}, {@link #PERSISTENT_SCROLLING_CACHE} 4434 * and {@link #PERSISTENT_ALL_CACHES} 4435 */ 4436 public void setPersistentDrawingCache(int drawingCacheToKeep) { 4437 mPersistentDrawingCache = drawingCacheToKeep & PERSISTENT_ALL_CACHES; 4438 } 4439 4440 /** 4441 * Returns a new set of layout parameters based on the supplied attributes set. 4442 * 4443 * @param attrs the attributes to build the layout parameters from 4444 * 4445 * @return an instance of {@link android.view.ViewGroup.LayoutParams} or one 4446 * of its descendants 4447 */ 4448 public LayoutParams generateLayoutParams(AttributeSet attrs) { 4449 return new LayoutParams(getContext(), attrs); 4450 } 4451 4452 /** 4453 * Returns a safe set of layout parameters based on the supplied layout params. 4454 * When a ViewGroup is passed a View whose layout params do not pass the test of 4455 * {@link #checkLayoutParams(android.view.ViewGroup.LayoutParams)}, this method 4456 * is invoked. This method should return a new set of layout params suitable for 4457 * this ViewGroup, possibly by copying the appropriate attributes from the 4458 * specified set of layout params. 4459 * 4460 * @param p The layout parameters to convert into a suitable set of layout parameters 4461 * for this ViewGroup. 4462 * 4463 * @return an instance of {@link android.view.ViewGroup.LayoutParams} or one 4464 * of its descendants 4465 */ 4466 protected LayoutParams generateLayoutParams(ViewGroup.LayoutParams p) { 4467 return p; 4468 } 4469 4470 /** 4471 * Returns a set of default layout parameters. These parameters are requested 4472 * when the View passed to {@link #addView(View)} has no layout parameters 4473 * already set. If null is returned, an exception is thrown from addView. 4474 * 4475 * @return a set of default layout parameters or null 4476 */ 4477 protected LayoutParams generateDefaultLayoutParams() { 4478 return new LayoutParams(LayoutParams.WRAP_CONTENT, LayoutParams.WRAP_CONTENT); 4479 } 4480 4481 /** 4482 * @hide 4483 */ 4484 @Override 4485 protected boolean dispatchConsistencyCheck(int consistency) { 4486 boolean result = super.dispatchConsistencyCheck(consistency); 4487 4488 final int count = mChildrenCount; 4489 final View[] children = mChildren; 4490 for (int i = 0; i < count; i++) { 4491 if (!children[i].dispatchConsistencyCheck(consistency)) result = false; 4492 } 4493 4494 return result; 4495 } 4496 4497 /** 4498 * @hide 4499 */ 4500 @Override 4501 protected boolean onConsistencyCheck(int consistency) { 4502 boolean result = super.onConsistencyCheck(consistency); 4503 4504 final boolean checkLayout = (consistency & ViewDebug.CONSISTENCY_LAYOUT) != 0; 4505 final boolean checkDrawing = (consistency & ViewDebug.CONSISTENCY_DRAWING) != 0; 4506 4507 if (checkLayout) { 4508 final int count = mChildrenCount; 4509 final View[] children = mChildren; 4510 for (int i = 0; i < count; i++) { 4511 if (children[i].getParent() != this) { 4512 result = false; 4513 android.util.Log.d(ViewDebug.CONSISTENCY_LOG_TAG, 4514 "View " + children[i] + " has no parent/a parent that is not " + this); 4515 } 4516 } 4517 } 4518 4519 if (checkDrawing) { 4520 // If this group is dirty, check that the parent is dirty as well 4521 if ((mPrivateFlags & DIRTY_MASK) != 0) { 4522 final ViewParent parent = getParent(); 4523 if (parent != null && !(parent instanceof ViewRootImpl)) { 4524 if ((((View) parent).mPrivateFlags & DIRTY_MASK) == 0) { 4525 result = false; 4526 android.util.Log.d(ViewDebug.CONSISTENCY_LOG_TAG, 4527 "ViewGroup " + this + " is dirty but its parent is not: " + this); 4528 } 4529 } 4530 } 4531 } 4532 4533 return result; 4534 } 4535 4536 /** 4537 * {@inheritDoc} 4538 */ 4539 @Override 4540 protected void debug(int depth) { 4541 super.debug(depth); 4542 String output; 4543 4544 if (mFocused != null) { 4545 output = debugIndent(depth); 4546 output += "mFocused"; 4547 Log.d(VIEW_LOG_TAG, output); 4548 } 4549 if (mChildrenCount != 0) { 4550 output = debugIndent(depth); 4551 output += "{"; 4552 Log.d(VIEW_LOG_TAG, output); 4553 } 4554 int count = mChildrenCount; 4555 for (int i = 0; i < count; i++) { 4556 View child = mChildren[i]; 4557 child.debug(depth + 1); 4558 } 4559 4560 if (mChildrenCount != 0) { 4561 output = debugIndent(depth); 4562 output += "}"; 4563 Log.d(VIEW_LOG_TAG, output); 4564 } 4565 } 4566 4567 /** 4568 * Returns the position in the group of the specified child view. 4569 * 4570 * @param child the view for which to get the position 4571 * @return a positive integer representing the position of the view in the 4572 * group, or -1 if the view does not exist in the group 4573 */ 4574 public int indexOfChild(View child) { 4575 final int count = mChildrenCount; 4576 final View[] children = mChildren; 4577 for (int i = 0; i < count; i++) { 4578 if (children[i] == child) { 4579 return i; 4580 } 4581 } 4582 return -1; 4583 } 4584 4585 /** 4586 * Returns the number of children in the group. 4587 * 4588 * @return a positive integer representing the number of children in 4589 * the group 4590 */ 4591 public int getChildCount() { 4592 return mChildrenCount; 4593 } 4594 4595 /** 4596 * Returns the view at the specified position in the group. 4597 * 4598 * @param index the position at which to get the view from 4599 * @return the view at the specified position or null if the position 4600 * does not exist within the group 4601 */ 4602 public View getChildAt(int index) { 4603 if (index < 0 || index >= mChildrenCount) { 4604 return null; 4605 } 4606 return mChildren[index]; 4607 } 4608 4609 /** 4610 * Ask all of the children of this view to measure themselves, taking into 4611 * account both the MeasureSpec requirements for this view and its padding. 4612 * We skip children that are in the GONE state The heavy lifting is done in 4613 * getChildMeasureSpec. 4614 * 4615 * @param widthMeasureSpec The width requirements for this view 4616 * @param heightMeasureSpec The height requirements for this view 4617 */ 4618 protected void measureChildren(int widthMeasureSpec, int heightMeasureSpec) { 4619 final int size = mChildrenCount; 4620 final View[] children = mChildren; 4621 for (int i = 0; i < size; ++i) { 4622 final View child = children[i]; 4623 if ((child.mViewFlags & VISIBILITY_MASK) != GONE) { 4624 measureChild(child, widthMeasureSpec, heightMeasureSpec); 4625 } 4626 } 4627 } 4628 4629 /** 4630 * Ask one of the children of this view to measure itself, taking into 4631 * account both the MeasureSpec requirements for this view and its padding. 4632 * The heavy lifting is done in getChildMeasureSpec. 4633 * 4634 * @param child The child to measure 4635 * @param parentWidthMeasureSpec The width requirements for this view 4636 * @param parentHeightMeasureSpec The height requirements for this view 4637 */ 4638 protected void measureChild(View child, int parentWidthMeasureSpec, 4639 int parentHeightMeasureSpec) { 4640 final LayoutParams lp = child.getLayoutParams(); 4641 4642 final int childWidthMeasureSpec = getChildMeasureSpec(parentWidthMeasureSpec, 4643 mPaddingLeft + mPaddingRight, lp.width); 4644 final int childHeightMeasureSpec = getChildMeasureSpec(parentHeightMeasureSpec, 4645 mPaddingTop + mPaddingBottom, lp.height); 4646 4647 child.measure(childWidthMeasureSpec, childHeightMeasureSpec); 4648 } 4649 4650 /** 4651 * Ask one of the children of this view to measure itself, taking into 4652 * account both the MeasureSpec requirements for this view and its padding 4653 * and margins. The child must have MarginLayoutParams The heavy lifting is 4654 * done in getChildMeasureSpec. 4655 * 4656 * @param child The child to measure 4657 * @param parentWidthMeasureSpec The width requirements for this view 4658 * @param widthUsed Extra space that has been used up by the parent 4659 * horizontally (possibly by other children of the parent) 4660 * @param parentHeightMeasureSpec The height requirements for this view 4661 * @param heightUsed Extra space that has been used up by the parent 4662 * vertically (possibly by other children of the parent) 4663 */ 4664 protected void measureChildWithMargins(View child, 4665 int parentWidthMeasureSpec, int widthUsed, 4666 int parentHeightMeasureSpec, int heightUsed) { 4667 final MarginLayoutParams lp = (MarginLayoutParams) child.getLayoutParams(); 4668 4669 final int childWidthMeasureSpec = getChildMeasureSpec(parentWidthMeasureSpec, 4670 mPaddingLeft + mPaddingRight + lp.leftMargin + lp.rightMargin 4671 + widthUsed, lp.width); 4672 final int childHeightMeasureSpec = getChildMeasureSpec(parentHeightMeasureSpec, 4673 mPaddingTop + mPaddingBottom + lp.topMargin + lp.bottomMargin 4674 + heightUsed, lp.height); 4675 4676 child.measure(childWidthMeasureSpec, childHeightMeasureSpec); 4677 } 4678 4679 /** 4680 * Does the hard part of measureChildren: figuring out the MeasureSpec to 4681 * pass to a particular child. This method figures out the right MeasureSpec 4682 * for one dimension (height or width) of one child view. 4683 * 4684 * The goal is to combine information from our MeasureSpec with the 4685 * LayoutParams of the child to get the best possible results. For example, 4686 * if the this view knows its size (because its MeasureSpec has a mode of 4687 * EXACTLY), and the child has indicated in its LayoutParams that it wants 4688 * to be the same size as the parent, the parent should ask the child to 4689 * layout given an exact size. 4690 * 4691 * @param spec The requirements for this view 4692 * @param padding The padding of this view for the current dimension and 4693 * margins, if applicable 4694 * @param childDimension How big the child wants to be in the current 4695 * dimension 4696 * @return a MeasureSpec integer for the child 4697 */ 4698 public static int getChildMeasureSpec(int spec, int padding, int childDimension) { 4699 int specMode = MeasureSpec.getMode(spec); 4700 int specSize = MeasureSpec.getSize(spec); 4701 4702 int size = Math.max(0, specSize - padding); 4703 4704 int resultSize = 0; 4705 int resultMode = 0; 4706 4707 switch (specMode) { 4708 // Parent has imposed an exact size on us 4709 case MeasureSpec.EXACTLY: 4710 if (childDimension >= 0) { 4711 resultSize = childDimension; 4712 resultMode = MeasureSpec.EXACTLY; 4713 } else if (childDimension == LayoutParams.MATCH_PARENT) { 4714 // Child wants to be our size. So be it. 4715 resultSize = size; 4716 resultMode = MeasureSpec.EXACTLY; 4717 } else if (childDimension == LayoutParams.WRAP_CONTENT) { 4718 // Child wants to determine its own size. It can't be 4719 // bigger than us. 4720 resultSize = size; 4721 resultMode = MeasureSpec.AT_MOST; 4722 } 4723 break; 4724 4725 // Parent has imposed a maximum size on us 4726 case MeasureSpec.AT_MOST: 4727 if (childDimension >= 0) { 4728 // Child wants a specific size... so be it 4729 resultSize = childDimension; 4730 resultMode = MeasureSpec.EXACTLY; 4731 } else if (childDimension == LayoutParams.MATCH_PARENT) { 4732 // Child wants to be our size, but our size is not fixed. 4733 // Constrain child to not be bigger than us. 4734 resultSize = size; 4735 resultMode = MeasureSpec.AT_MOST; 4736 } else if (childDimension == LayoutParams.WRAP_CONTENT) { 4737 // Child wants to determine its own size. It can't be 4738 // bigger than us. 4739 resultSize = size; 4740 resultMode = MeasureSpec.AT_MOST; 4741 } 4742 break; 4743 4744 // Parent asked to see how big we want to be 4745 case MeasureSpec.UNSPECIFIED: 4746 if (childDimension >= 0) { 4747 // Child wants a specific size... let him have it 4748 resultSize = childDimension; 4749 resultMode = MeasureSpec.EXACTLY; 4750 } else if (childDimension == LayoutParams.MATCH_PARENT) { 4751 // Child wants to be our size... find out how big it should 4752 // be 4753 resultSize = 0; 4754 resultMode = MeasureSpec.UNSPECIFIED; 4755 } else if (childDimension == LayoutParams.WRAP_CONTENT) { 4756 // Child wants to determine its own size.... find out how 4757 // big it should be 4758 resultSize = 0; 4759 resultMode = MeasureSpec.UNSPECIFIED; 4760 } 4761 break; 4762 } 4763 return MeasureSpec.makeMeasureSpec(resultSize, resultMode); 4764 } 4765 4766 4767 /** 4768 * Removes any pending animations for views that have been removed. Call 4769 * this if you don't want animations for exiting views to stack up. 4770 */ 4771 public void clearDisappearingChildren() { 4772 if (mDisappearingChildren != null) { 4773 mDisappearingChildren.clear(); 4774 } 4775 } 4776 4777 /** 4778 * Add a view which is removed from mChildren but still needs animation 4779 * 4780 * @param v View to add 4781 */ 4782 private void addDisappearingView(View v) { 4783 ArrayList<View> disappearingChildren = mDisappearingChildren; 4784 4785 if (disappearingChildren == null) { 4786 disappearingChildren = mDisappearingChildren = new ArrayList<View>(); 4787 } 4788 4789 disappearingChildren.add(v); 4790 } 4791 4792 /** 4793 * Cleanup a view when its animation is done. This may mean removing it from 4794 * the list of disappearing views. 4795 * 4796 * @param view The view whose animation has finished 4797 * @param animation The animation, cannot be null 4798 */ 4799 private void finishAnimatingView(final View view, Animation animation) { 4800 final ArrayList<View> disappearingChildren = mDisappearingChildren; 4801 if (disappearingChildren != null) { 4802 if (disappearingChildren.contains(view)) { 4803 disappearingChildren.remove(view); 4804 4805 if (view.mAttachInfo != null) { 4806 view.dispatchDetachedFromWindow(); 4807 } 4808 4809 view.clearAnimation(); 4810 mGroupFlags |= FLAG_INVALIDATE_REQUIRED; 4811 } 4812 } 4813 4814 if (animation != null && !animation.getFillAfter()) { 4815 view.clearAnimation(); 4816 } 4817 4818 if ((view.mPrivateFlags & ANIMATION_STARTED) == ANIMATION_STARTED) { 4819 view.onAnimationEnd(); 4820 // Should be performed by onAnimationEnd() but this avoid an infinite loop, 4821 // so we'd rather be safe than sorry 4822 view.mPrivateFlags &= ~ANIMATION_STARTED; 4823 // Draw one more frame after the animation is done 4824 mGroupFlags |= FLAG_INVALIDATE_REQUIRED; 4825 } 4826 } 4827 4828 /** 4829 * Utility function called by View during invalidation to determine whether a view that 4830 * is invisible or gone should still be invalidated because it is being transitioned (and 4831 * therefore still needs to be drawn). 4832 */ 4833 boolean isViewTransitioning(View view) { 4834 return (mTransitioningViews != null && mTransitioningViews.contains(view)); 4835 } 4836 4837 /** 4838 * This method tells the ViewGroup that the given View object, which should have this 4839 * ViewGroup as its parent, 4840 * should be kept around (re-displayed when the ViewGroup draws its children) even if it 4841 * is removed from its parent. This allows animations, such as those used by 4842 * {@link android.app.Fragment} and {@link android.animation.LayoutTransition} to animate 4843 * the removal of views. A call to this method should always be accompanied by a later call 4844 * to {@link #endViewTransition(View)}, such as after an animation on the View has finished, 4845 * so that the View finally gets removed. 4846 * 4847 * @param view The View object to be kept visible even if it gets removed from its parent. 4848 */ 4849 public void startViewTransition(View view) { 4850 if (view.mParent == this) { 4851 if (mTransitioningViews == null) { 4852 mTransitioningViews = new ArrayList<View>(); 4853 } 4854 mTransitioningViews.add(view); 4855 } 4856 } 4857 4858 /** 4859 * This method should always be called following an earlier call to 4860 * {@link #startViewTransition(View)}. The given View is finally removed from its parent 4861 * and will no longer be displayed. Note that this method does not perform the functionality 4862 * of removing a view from its parent; it just discontinues the display of a View that 4863 * has previously been removed. 4864 * 4865 * @return view The View object that has been removed but is being kept around in the visible 4866 * hierarchy by an earlier call to {@link #startViewTransition(View)}. 4867 */ 4868 public void endViewTransition(View view) { 4869 if (mTransitioningViews != null) { 4870 mTransitioningViews.remove(view); 4871 final ArrayList<View> disappearingChildren = mDisappearingChildren; 4872 if (disappearingChildren != null && disappearingChildren.contains(view)) { 4873 disappearingChildren.remove(view); 4874 if (mVisibilityChangingChildren != null && 4875 mVisibilityChangingChildren.contains(view)) { 4876 mVisibilityChangingChildren.remove(view); 4877 } else { 4878 if (view.mAttachInfo != null) { 4879 view.dispatchDetachedFromWindow(); 4880 } 4881 if (view.mParent != null) { 4882 view.mParent = null; 4883 } 4884 } 4885 mGroupFlags |= FLAG_INVALIDATE_REQUIRED; 4886 } 4887 } 4888 } 4889 4890 private LayoutTransition.TransitionListener mLayoutTransitionListener = 4891 new LayoutTransition.TransitionListener() { 4892 @Override 4893 public void startTransition(LayoutTransition transition, ViewGroup container, 4894 View view, int transitionType) { 4895 // We only care about disappearing items, since we need special logic to keep 4896 // those items visible after they've been 'removed' 4897 if (transitionType == LayoutTransition.DISAPPEARING) { 4898 startViewTransition(view); 4899 } 4900 } 4901 4902 @Override 4903 public void endTransition(LayoutTransition transition, ViewGroup container, 4904 View view, int transitionType) { 4905 if (mLayoutSuppressed && !transition.isChangingLayout()) { 4906 requestLayout(); 4907 mLayoutSuppressed = false; 4908 } 4909 if (transitionType == LayoutTransition.DISAPPEARING && mTransitioningViews != null) { 4910 endViewTransition(view); 4911 } 4912 } 4913 }; 4914 4915 /** 4916 * {@inheritDoc} 4917 */ 4918 @Override 4919 public boolean gatherTransparentRegion(Region region) { 4920 // If no transparent regions requested, we are always opaque. 4921 final boolean meOpaque = (mPrivateFlags & View.REQUEST_TRANSPARENT_REGIONS) == 0; 4922 if (meOpaque && region == null) { 4923 // The caller doesn't care about the region, so stop now. 4924 return true; 4925 } 4926 super.gatherTransparentRegion(region); 4927 final View[] children = mChildren; 4928 final int count = mChildrenCount; 4929 boolean noneOfTheChildrenAreTransparent = true; 4930 for (int i = 0; i < count; i++) { 4931 final View child = children[i]; 4932 if ((child.mViewFlags & VISIBILITY_MASK) == VISIBLE || child.getAnimation() != null) { 4933 if (!child.gatherTransparentRegion(region)) { 4934 noneOfTheChildrenAreTransparent = false; 4935 } 4936 } 4937 } 4938 return meOpaque || noneOfTheChildrenAreTransparent; 4939 } 4940 4941 /** 4942 * {@inheritDoc} 4943 */ 4944 public void requestTransparentRegion(View child) { 4945 if (child != null) { 4946 child.mPrivateFlags |= View.REQUEST_TRANSPARENT_REGIONS; 4947 if (mParent != null) { 4948 mParent.requestTransparentRegion(this); 4949 } 4950 } 4951 } 4952 4953 4954 @Override 4955 protected boolean fitSystemWindows(Rect insets) { 4956 boolean done = super.fitSystemWindows(insets); 4957 if (!done) { 4958 final int count = mChildrenCount; 4959 final View[] children = mChildren; 4960 for (int i = 0; i < count; i++) { 4961 done = children[i].fitSystemWindows(insets); 4962 if (done) { 4963 break; 4964 } 4965 } 4966 } 4967 return done; 4968 } 4969 4970 /** 4971 * Returns the animation listener to which layout animation events are 4972 * sent. 4973 * 4974 * @return an {@link android.view.animation.Animation.AnimationListener} 4975 */ 4976 public Animation.AnimationListener getLayoutAnimationListener() { 4977 return mAnimationListener; 4978 } 4979 4980 @Override 4981 protected void drawableStateChanged() { 4982 super.drawableStateChanged(); 4983 4984 if ((mGroupFlags & FLAG_NOTIFY_CHILDREN_ON_DRAWABLE_STATE_CHANGE) != 0) { 4985 if ((mGroupFlags & FLAG_ADD_STATES_FROM_CHILDREN) != 0) { 4986 throw new IllegalStateException("addStateFromChildren cannot be enabled if a" 4987 + " child has duplicateParentState set to true"); 4988 } 4989 4990 final View[] children = mChildren; 4991 final int count = mChildrenCount; 4992 4993 for (int i = 0; i < count; i++) { 4994 final View child = children[i]; 4995 if ((child.mViewFlags & DUPLICATE_PARENT_STATE) != 0) { 4996 child.refreshDrawableState(); 4997 } 4998 } 4999 } 5000 } 5001 5002 @Override 5003 public void jumpDrawablesToCurrentState() { 5004 super.jumpDrawablesToCurrentState(); 5005 final View[] children = mChildren; 5006 final int count = mChildrenCount; 5007 for (int i = 0; i < count; i++) { 5008 children[i].jumpDrawablesToCurrentState(); 5009 } 5010 } 5011 5012 @Override 5013 protected int[] onCreateDrawableState(int extraSpace) { 5014 if ((mGroupFlags & FLAG_ADD_STATES_FROM_CHILDREN) == 0) { 5015 return super.onCreateDrawableState(extraSpace); 5016 } 5017 5018 int need = 0; 5019 int n = getChildCount(); 5020 for (int i = 0; i < n; i++) { 5021 int[] childState = getChildAt(i).getDrawableState(); 5022 5023 if (childState != null) { 5024 need += childState.length; 5025 } 5026 } 5027 5028 int[] state = super.onCreateDrawableState(extraSpace + need); 5029 5030 for (int i = 0; i < n; i++) { 5031 int[] childState = getChildAt(i).getDrawableState(); 5032 5033 if (childState != null) { 5034 state = mergeDrawableStates(state, childState); 5035 } 5036 } 5037 5038 return state; 5039 } 5040 5041 /** 5042 * Sets whether this ViewGroup's drawable states also include 5043 * its children's drawable states. This is used, for example, to 5044 * make a group appear to be focused when its child EditText or button 5045 * is focused. 5046 */ 5047 public void setAddStatesFromChildren(boolean addsStates) { 5048 if (addsStates) { 5049 mGroupFlags |= FLAG_ADD_STATES_FROM_CHILDREN; 5050 } else { 5051 mGroupFlags &= ~FLAG_ADD_STATES_FROM_CHILDREN; 5052 } 5053 5054 refreshDrawableState(); 5055 } 5056 5057 /** 5058 * Returns whether this ViewGroup's drawable states also include 5059 * its children's drawable states. This is used, for example, to 5060 * make a group appear to be focused when its child EditText or button 5061 * is focused. 5062 */ 5063 public boolean addStatesFromChildren() { 5064 return (mGroupFlags & FLAG_ADD_STATES_FROM_CHILDREN) != 0; 5065 } 5066 5067 /** 5068 * If {link #addStatesFromChildren} is true, refreshes this group's 5069 * drawable state (to include the states from its children). 5070 */ 5071 public void childDrawableStateChanged(View child) { 5072 if ((mGroupFlags & FLAG_ADD_STATES_FROM_CHILDREN) != 0) { 5073 refreshDrawableState(); 5074 } 5075 } 5076 5077 /** 5078 * Specifies the animation listener to which layout animation events must 5079 * be sent. Only 5080 * {@link android.view.animation.Animation.AnimationListener#onAnimationStart(Animation)} 5081 * and 5082 * {@link android.view.animation.Animation.AnimationListener#onAnimationEnd(Animation)} 5083 * are invoked. 5084 * 5085 * @param animationListener the layout animation listener 5086 */ 5087 public void setLayoutAnimationListener(Animation.AnimationListener animationListener) { 5088 mAnimationListener = animationListener; 5089 } 5090 5091 /** 5092 * This method is called by LayoutTransition when there are 'changing' animations that need 5093 * to start after the layout/setup phase. The request is forwarded to the ViewAncestor, who 5094 * starts all pending transitions prior to the drawing phase in the current traversal. 5095 * 5096 * @param transition The LayoutTransition to be started on the next traversal. 5097 * 5098 * @hide 5099 */ 5100 public void requestTransitionStart(LayoutTransition transition) { 5101 ViewRootImpl viewAncestor = getViewRootImpl(); 5102 if (viewAncestor != null) { 5103 viewAncestor.requestTransitionStart(transition); 5104 } 5105 } 5106 5107 @Override 5108 protected void resetResolvedLayoutDirection() { 5109 super.resetResolvedLayoutDirection(); 5110 5111 // Take care of resetting the children resolution too 5112 final int count = getChildCount(); 5113 for (int i = 0; i < count; i++) { 5114 final View child = getChildAt(i); 5115 if (child.getLayoutDirection() == LAYOUT_DIRECTION_INHERIT) { 5116 child.resetResolvedLayoutDirection(); 5117 } 5118 } 5119 } 5120 5121 @Override 5122 protected void resetResolvedTextDirection() { 5123 super.resetResolvedTextDirection(); 5124 5125 // Take care of resetting the children resolution too 5126 final int count = getChildCount(); 5127 for (int i = 0; i < count; i++) { 5128 final View child = getChildAt(i); 5129 if (child.getTextDirection() == TEXT_DIRECTION_INHERIT) { 5130 child.resetResolvedTextDirection(); 5131 } 5132 } 5133 } 5134 5135 /** 5136 * Return true if the pressed state should be delayed for children or descendants of this 5137 * ViewGroup. Generally, this should be done for containers that can scroll, such as a List. 5138 * This prevents the pressed state from appearing when the user is actually trying to scroll 5139 * the content. 5140 * 5141 * The default implementation returns true for compatibility reasons. Subclasses that do 5142 * not scroll should generally override this method and return false. 5143 */ 5144 public boolean shouldDelayChildPressedState() { 5145 return true; 5146 } 5147 5148 /** 5149 * LayoutParams are used by views to tell their parents how they want to be 5150 * laid out. See 5151 * {@link android.R.styleable#ViewGroup_Layout ViewGroup Layout Attributes} 5152 * for a list of all child view attributes that this class supports. 5153 * 5154 * <p> 5155 * The base LayoutParams class just describes how big the view wants to be 5156 * for both width and height. For each dimension, it can specify one of: 5157 * <ul> 5158 * <li>FILL_PARENT (renamed MATCH_PARENT in API Level 8 and higher), which 5159 * means that the view wants to be as big as its parent (minus padding) 5160 * <li> WRAP_CONTENT, which means that the view wants to be just big enough 5161 * to enclose its content (plus padding) 5162 * <li> an exact number 5163 * </ul> 5164 * There are subclasses of LayoutParams for different subclasses of 5165 * ViewGroup. For example, AbsoluteLayout has its own subclass of 5166 * LayoutParams which adds an X and Y value.</p> 5167 * 5168 * <div class="special reference"> 5169 * <h3>Developer Guides</h3> 5170 * <p>For more information about creating user interface layouts, read the 5171 * <a href="{@docRoot}guide/topics/ui/declaring-layout.html">XML Layouts</a> developer 5172 * guide.</p></div> 5173 * 5174 * @attr ref android.R.styleable#ViewGroup_Layout_layout_height 5175 * @attr ref android.R.styleable#ViewGroup_Layout_layout_width 5176 */ 5177 public static class LayoutParams { 5178 /** 5179 * Special value for the height or width requested by a View. 5180 * FILL_PARENT means that the view wants to be as big as its parent, 5181 * minus the parent's padding, if any. This value is deprecated 5182 * starting in API Level 8 and replaced by {@link #MATCH_PARENT}. 5183 */ 5184 @SuppressWarnings({"UnusedDeclaration"}) 5185 @Deprecated 5186 public static final int FILL_PARENT = -1; 5187 5188 /** 5189 * Special value for the height or width requested by a View. 5190 * MATCH_PARENT means that the view wants to be as big as its parent, 5191 * minus the parent's padding, if any. Introduced in API Level 8. 5192 */ 5193 public static final int MATCH_PARENT = -1; 5194 5195 /** 5196 * Special value for the height or width requested by a View. 5197 * WRAP_CONTENT means that the view wants to be just large enough to fit 5198 * its own internal content, taking its own padding into account. 5199 */ 5200 public static final int WRAP_CONTENT = -2; 5201 5202 /** 5203 * Information about how wide the view wants to be. Can be one of the 5204 * constants FILL_PARENT (replaced by MATCH_PARENT , 5205 * in API Level 8) or WRAP_CONTENT. or an exact size. 5206 */ 5207 @ViewDebug.ExportedProperty(category = "layout", mapping = { 5208 @ViewDebug.IntToString(from = MATCH_PARENT, to = "MATCH_PARENT"), 5209 @ViewDebug.IntToString(from = WRAP_CONTENT, to = "WRAP_CONTENT") 5210 }) 5211 public int width; 5212 5213 /** 5214 * Information about how tall the view wants to be. Can be one of the 5215 * constants FILL_PARENT (replaced by MATCH_PARENT , 5216 * in API Level 8) or WRAP_CONTENT. or an exact size. 5217 */ 5218 @ViewDebug.ExportedProperty(category = "layout", mapping = { 5219 @ViewDebug.IntToString(from = MATCH_PARENT, to = "MATCH_PARENT"), 5220 @ViewDebug.IntToString(from = WRAP_CONTENT, to = "WRAP_CONTENT") 5221 }) 5222 public int height; 5223 5224 /** 5225 * Used to animate layouts. 5226 */ 5227 public LayoutAnimationController.AnimationParameters layoutAnimationParameters; 5228 5229 /** 5230 * Creates a new set of layout parameters. The values are extracted from 5231 * the supplied attributes set and context. The XML attributes mapped 5232 * to this set of layout parameters are: 5233 * 5234 * <ul> 5235 * <li><code>layout_width</code>: the width, either an exact value, 5236 * {@link #WRAP_CONTENT}, or {@link #FILL_PARENT} (replaced by 5237 * {@link #MATCH_PARENT} in API Level 8)</li> 5238 * <li><code>layout_height</code>: the height, either an exact value, 5239 * {@link #WRAP_CONTENT}, or {@link #FILL_PARENT} (replaced by 5240 * {@link #MATCH_PARENT} in API Level 8)</li> 5241 * </ul> 5242 * 5243 * @param c the application environment 5244 * @param attrs the set of attributes from which to extract the layout 5245 * parameters' values 5246 */ 5247 public LayoutParams(Context c, AttributeSet attrs) { 5248 TypedArray a = c.obtainStyledAttributes(attrs, R.styleable.ViewGroup_Layout); 5249 setBaseAttributes(a, 5250 R.styleable.ViewGroup_Layout_layout_width, 5251 R.styleable.ViewGroup_Layout_layout_height); 5252 a.recycle(); 5253 } 5254 5255 /** 5256 * Creates a new set of layout parameters with the specified width 5257 * and height. 5258 * 5259 * @param width the width, either {@link #WRAP_CONTENT}, 5260 * {@link #FILL_PARENT} (replaced by {@link #MATCH_PARENT} in 5261 * API Level 8), or a fixed size in pixels 5262 * @param height the height, either {@link #WRAP_CONTENT}, 5263 * {@link #FILL_PARENT} (replaced by {@link #MATCH_PARENT} in 5264 * API Level 8), or a fixed size in pixels 5265 */ 5266 public LayoutParams(int width, int height) { 5267 this.width = width; 5268 this.height = height; 5269 } 5270 5271 /** 5272 * Copy constructor. Clones the width and height values of the source. 5273 * 5274 * @param source The layout params to copy from. 5275 */ 5276 public LayoutParams(LayoutParams source) { 5277 this.width = source.width; 5278 this.height = source.height; 5279 } 5280 5281 /** 5282 * Used internally by MarginLayoutParams. 5283 * @hide 5284 */ 5285 LayoutParams() { 5286 } 5287 5288 /** 5289 * Extracts the layout parameters from the supplied attributes. 5290 * 5291 * @param a the style attributes to extract the parameters from 5292 * @param widthAttr the identifier of the width attribute 5293 * @param heightAttr the identifier of the height attribute 5294 */ 5295 protected void setBaseAttributes(TypedArray a, int widthAttr, int heightAttr) { 5296 width = a.getLayoutDimension(widthAttr, "layout_width"); 5297 height = a.getLayoutDimension(heightAttr, "layout_height"); 5298 } 5299 5300 /** 5301 * Resolve layout parameters depending on the layout direction. Subclasses that care about 5302 * layoutDirection changes should override this method. The default implementation does 5303 * nothing. 5304 * 5305 * @param layoutDirection the direction of the layout 5306 * 5307 * {@link View#LAYOUT_DIRECTION_LTR} 5308 * {@link View#LAYOUT_DIRECTION_RTL} 5309 * 5310 * @hide 5311 */ 5312 protected void resolveWithDirection(int layoutDirection) { 5313 } 5314 5315 /** 5316 * Returns a String representation of this set of layout parameters. 5317 * 5318 * @param output the String to prepend to the internal representation 5319 * @return a String with the following format: output + 5320 * "ViewGroup.LayoutParams={ width=WIDTH, height=HEIGHT }" 5321 * 5322 * @hide 5323 */ 5324 public String debug(String output) { 5325 return output + "ViewGroup.LayoutParams={ width=" 5326 + sizeToString(width) + ", height=" + sizeToString(height) + " }"; 5327 } 5328 5329 /** 5330 * Converts the specified size to a readable String. 5331 * 5332 * @param size the size to convert 5333 * @return a String instance representing the supplied size 5334 * 5335 * @hide 5336 */ 5337 protected static String sizeToString(int size) { 5338 if (size == WRAP_CONTENT) { 5339 return "wrap-content"; 5340 } 5341 if (size == MATCH_PARENT) { 5342 return "match-parent"; 5343 } 5344 return String.valueOf(size); 5345 } 5346 } 5347 5348 /** 5349 * Per-child layout information for layouts that support margins. 5350 * See 5351 * {@link android.R.styleable#ViewGroup_MarginLayout ViewGroup Margin Layout Attributes} 5352 * for a list of all child view attributes that this class supports. 5353 */ 5354 public static class MarginLayoutParams extends ViewGroup.LayoutParams { 5355 /** 5356 * The left margin in pixels of the child. Whenever this value is changed, a call to 5357 * {@link android.view.View#requestLayout()} needs to be done. 5358 */ 5359 @ViewDebug.ExportedProperty(category = "layout") 5360 public int leftMargin; 5361 5362 /** 5363 * The top margin in pixels of the child. Whenever this value is changed, a call to 5364 * {@link android.view.View#requestLayout()} needs to be done. 5365 */ 5366 @ViewDebug.ExportedProperty(category = "layout") 5367 public int topMargin; 5368 5369 /** 5370 * The right margin in pixels of the child. Whenever this value is changed, a call to 5371 * {@link android.view.View#requestLayout()} needs to be done. 5372 */ 5373 @ViewDebug.ExportedProperty(category = "layout") 5374 public int rightMargin; 5375 5376 /** 5377 * The bottom margin in pixels of the child. Whenever this value is changed, a call to 5378 * {@link android.view.View#requestLayout()} needs to be done. 5379 */ 5380 @ViewDebug.ExportedProperty(category = "layout") 5381 public int bottomMargin; 5382 5383 /** 5384 * The start margin in pixels of the child. 5385 * 5386 * @hide 5387 * 5388 */ 5389 @ViewDebug.ExportedProperty(category = "layout") 5390 protected int startMargin = DEFAULT_RELATIVE; 5391 5392 /** 5393 * The end margin in pixels of the child. 5394 * 5395 * @hide 5396 */ 5397 @ViewDebug.ExportedProperty(category = "layout") 5398 protected int endMargin = DEFAULT_RELATIVE; 5399 5400 /** 5401 * The default start and end margin. 5402 */ 5403 static private final int DEFAULT_RELATIVE = Integer.MIN_VALUE; 5404 5405 /** 5406 * Creates a new set of layout parameters. The values are extracted from 5407 * the supplied attributes set and context. 5408 * 5409 * @param c the application environment 5410 * @param attrs the set of attributes from which to extract the layout 5411 * parameters' values 5412 */ 5413 public MarginLayoutParams(Context c, AttributeSet attrs) { 5414 super(); 5415 5416 TypedArray a = c.obtainStyledAttributes(attrs, R.styleable.ViewGroup_MarginLayout); 5417 setBaseAttributes(a, 5418 R.styleable.ViewGroup_MarginLayout_layout_width, 5419 R.styleable.ViewGroup_MarginLayout_layout_height); 5420 5421 int margin = a.getDimensionPixelSize( 5422 com.android.internal.R.styleable.ViewGroup_MarginLayout_layout_margin, -1); 5423 if (margin >= 0) { 5424 leftMargin = margin; 5425 topMargin = margin; 5426 rightMargin= margin; 5427 bottomMargin = margin; 5428 } else { 5429 leftMargin = a.getDimensionPixelSize( 5430 R.styleable.ViewGroup_MarginLayout_layout_marginLeft, 0); 5431 topMargin = a.getDimensionPixelSize( 5432 R.styleable.ViewGroup_MarginLayout_layout_marginTop, 0); 5433 rightMargin = a.getDimensionPixelSize( 5434 R.styleable.ViewGroup_MarginLayout_layout_marginRight, 0); 5435 bottomMargin = a.getDimensionPixelSize( 5436 R.styleable.ViewGroup_MarginLayout_layout_marginBottom, 0); 5437 startMargin = a.getDimensionPixelSize( 5438 R.styleable.ViewGroup_MarginLayout_layout_marginStart, DEFAULT_RELATIVE); 5439 endMargin = a.getDimensionPixelSize( 5440 R.styleable.ViewGroup_MarginLayout_layout_marginEnd, DEFAULT_RELATIVE); 5441 } 5442 5443 a.recycle(); 5444 } 5445 5446 /** 5447 * {@inheritDoc} 5448 */ 5449 public MarginLayoutParams(int width, int height) { 5450 super(width, height); 5451 } 5452 5453 /** 5454 * Copy constructor. Clones the width, height and margin values of the source. 5455 * 5456 * @param source The layout params to copy from. 5457 */ 5458 public MarginLayoutParams(MarginLayoutParams source) { 5459 this.width = source.width; 5460 this.height = source.height; 5461 5462 this.leftMargin = source.leftMargin; 5463 this.topMargin = source.topMargin; 5464 this.rightMargin = source.rightMargin; 5465 this.bottomMargin = source.bottomMargin; 5466 this.startMargin = source.startMargin; 5467 this.endMargin = source.endMargin; 5468 } 5469 5470 /** 5471 * {@inheritDoc} 5472 */ 5473 public MarginLayoutParams(LayoutParams source) { 5474 super(source); 5475 } 5476 5477 /** 5478 * Sets the margins, in pixels. A call to {@link android.view.View#requestLayout()} needs 5479 * to be done so that the new margins are taken into account. Left and right margins may be 5480 * overriden by {@link android.view.View#requestLayout()} depending on layout direction. 5481 * 5482 * @param left the left margin size 5483 * @param top the top margin size 5484 * @param right the right margin size 5485 * @param bottom the bottom margin size 5486 * 5487 * @attr ref android.R.styleable#ViewGroup_MarginLayout_layout_marginLeft 5488 * @attr ref android.R.styleable#ViewGroup_MarginLayout_layout_marginTop 5489 * @attr ref android.R.styleable#ViewGroup_MarginLayout_layout_marginRight 5490 * @attr ref android.R.styleable#ViewGroup_MarginLayout_layout_marginBottom 5491 */ 5492 public void setMargins(int left, int top, int right, int bottom) { 5493 leftMargin = left; 5494 topMargin = top; 5495 rightMargin = right; 5496 bottomMargin = bottom; 5497 } 5498 5499 /** 5500 * Sets the relative margins, in pixels. A call to {@link android.view.View#requestLayout()} 5501 * needs to be done so that the new relative margins are taken into account. Left and right 5502 * margins may be overriden by {@link android.view.View#requestLayout()} depending on layout 5503 * direction. 5504 * 5505 * @param start the start margin size 5506 * @param top the top margin size 5507 * @param end the right margin size 5508 * @param bottom the bottom margin size 5509 * 5510 * @attr ref android.R.styleable#ViewGroup_MarginLayout_layout_marginStart 5511 * @attr ref android.R.styleable#ViewGroup_MarginLayout_layout_marginTop 5512 * @attr ref android.R.styleable#ViewGroup_MarginLayout_layout_marginEnd 5513 * @attr ref android.R.styleable#ViewGroup_MarginLayout_layout_marginBottom 5514 * 5515 * @hide 5516 */ 5517 public void setMarginsRelative(int start, int top, int end, int bottom) { 5518 startMargin = start; 5519 topMargin = top; 5520 endMargin = end; 5521 bottomMargin = bottom; 5522 } 5523 5524 /** 5525 * Returns the start margin in pixels. 5526 * 5527 * @attr ref android.R.styleable#ViewGroup_MarginLayout_layout_marginStart 5528 * 5529 * @return the start margin in pixels. 5530 * 5531 * @hide 5532 */ 5533 public int getMarginStart() { 5534 return startMargin; 5535 } 5536 5537 /** 5538 * Returns the end margin in pixels. 5539 * 5540 * @attr ref android.R.styleable#ViewGroup_MarginLayout_layout_marginEnd 5541 * 5542 * @return the end margin in pixels. 5543 * 5544 * @hide 5545 */ 5546 public int getMarginEnd() { 5547 return endMargin; 5548 } 5549 5550 /** 5551 * Check if margins are relative. 5552 * 5553 * @attr ref android.R.styleable#ViewGroup_MarginLayout_layout_marginStart 5554 * @attr ref android.R.styleable#ViewGroup_MarginLayout_layout_marginEnd 5555 * 5556 * @return true if either marginStart or marginEnd has been set 5557 * 5558 * @hide 5559 */ 5560 public boolean isMarginRelative() { 5561 return (startMargin != DEFAULT_RELATIVE) || (endMargin != DEFAULT_RELATIVE); 5562 } 5563 5564 /** 5565 * This will be called by {@link android.view.View#requestLayout()}. Left and Right margins 5566 * maybe overriden depending on layout direction. 5567 * 5568 * @hide 5569 */ 5570 @Override 5571 protected void resolveWithDirection(int layoutDirection) { 5572 switch(layoutDirection) { 5573 case View.LAYOUT_DIRECTION_RTL: 5574 leftMargin = (endMargin > DEFAULT_RELATIVE) ? endMargin : leftMargin; 5575 rightMargin = (startMargin > DEFAULT_RELATIVE) ? startMargin : rightMargin; 5576 break; 5577 case View.LAYOUT_DIRECTION_LTR: 5578 default: 5579 leftMargin = (startMargin > DEFAULT_RELATIVE) ? startMargin : leftMargin; 5580 rightMargin = (endMargin > DEFAULT_RELATIVE) ? endMargin : rightMargin; 5581 break; 5582 } 5583 } 5584 } 5585 5586 /* Describes a touched view and the ids of the pointers that it has captured. 5587 * 5588 * This code assumes that pointer ids are always in the range 0..31 such that 5589 * it can use a bitfield to track which pointer ids are present. 5590 * As it happens, the lower layers of the input dispatch pipeline also use the 5591 * same trick so the assumption should be safe here... 5592 */ 5593 private static final class TouchTarget { 5594 private static final int MAX_RECYCLED = 32; 5595 private static final Object sRecycleLock = new Object(); 5596 private static TouchTarget sRecycleBin; 5597 private static int sRecycledCount; 5598 5599 public static final int ALL_POINTER_IDS = -1; // all ones 5600 5601 // The touched child view. 5602 public View child; 5603 5604 // The combined bit mask of pointer ids for all pointers captured by the target. 5605 public int pointerIdBits; 5606 5607 // The next target in the target list. 5608 public TouchTarget next; 5609 5610 private TouchTarget() { 5611 } 5612 5613 public static TouchTarget obtain(View child, int pointerIdBits) { 5614 final TouchTarget target; 5615 synchronized (sRecycleLock) { 5616 if (sRecycleBin == null) { 5617 target = new TouchTarget(); 5618 } else { 5619 target = sRecycleBin; 5620 sRecycleBin = target.next; 5621 sRecycledCount--; 5622 target.next = null; 5623 } 5624 } 5625 target.child = child; 5626 target.pointerIdBits = pointerIdBits; 5627 return target; 5628 } 5629 5630 public void recycle() { 5631 synchronized (sRecycleLock) { 5632 if (sRecycledCount < MAX_RECYCLED) { 5633 next = sRecycleBin; 5634 sRecycleBin = this; 5635 sRecycledCount += 1; 5636 } else { 5637 next = null; 5638 } 5639 child = null; 5640 } 5641 } 5642 } 5643 5644 /* Describes a hovered view. */ 5645 private static final class HoverTarget { 5646 private static final int MAX_RECYCLED = 32; 5647 private static final Object sRecycleLock = new Object(); 5648 private static HoverTarget sRecycleBin; 5649 private static int sRecycledCount; 5650 5651 // The hovered child view. 5652 public View child; 5653 5654 // The next target in the target list. 5655 public HoverTarget next; 5656 5657 private HoverTarget() { 5658 } 5659 5660 public static HoverTarget obtain(View child) { 5661 final HoverTarget target; 5662 synchronized (sRecycleLock) { 5663 if (sRecycleBin == null) { 5664 target = new HoverTarget(); 5665 } else { 5666 target = sRecycleBin; 5667 sRecycleBin = target.next; 5668 sRecycledCount--; 5669 target.next = null; 5670 } 5671 } 5672 target.child = child; 5673 return target; 5674 } 5675 5676 public void recycle() { 5677 synchronized (sRecycleLock) { 5678 if (sRecycledCount < MAX_RECYCLED) { 5679 next = sRecycleBin; 5680 sRecycleBin = this; 5681 sRecycledCount += 1; 5682 } else { 5683 next = null; 5684 } 5685 child = null; 5686 } 5687 } 5688 } 5689} 5690