ViewGroup.java revision 167bc821ddfee3d6d3b1c0ea10636be7c6eb591a
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 com.android.internal.R; 21 22import android.content.Context; 23import android.content.res.Configuration; 24import android.content.res.TypedArray; 25import android.graphics.Bitmap; 26import android.graphics.Canvas; 27import android.graphics.Matrix; 28import android.graphics.Paint; 29import android.graphics.Rect; 30import android.graphics.RectF; 31import android.graphics.Region; 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.animation.Animation; 39import android.view.animation.AnimationUtils; 40import android.view.animation.LayoutAnimationController; 41import android.view.animation.Transformation; 42 43import java.util.ArrayList; 44 45/** 46 * <p> 47 * A <code>ViewGroup</code> is a special view that can contain other views 48 * (called children.) The view group is the base class for layouts and views 49 * containers. This class also defines the 50 * {@link android.view.ViewGroup.LayoutParams} class which serves as the base 51 * class for layouts parameters. 52 * </p> 53 * 54 * <p> 55 * Also see {@link LayoutParams} for layout attributes. 56 * </p> 57 * 58 * @attr ref android.R.styleable#ViewGroup_clipChildren 59 * @attr ref android.R.styleable#ViewGroup_clipToPadding 60 * @attr ref android.R.styleable#ViewGroup_layoutAnimation 61 * @attr ref android.R.styleable#ViewGroup_animationCache 62 * @attr ref android.R.styleable#ViewGroup_persistentDrawingCache 63 * @attr ref android.R.styleable#ViewGroup_alwaysDrawnWithCache 64 * @attr ref android.R.styleable#ViewGroup_addStatesFromChildren 65 * @attr ref android.R.styleable#ViewGroup_descendantFocusability 66 * @attr ref android.R.styleable#ViewGroup_animateLayoutChanges 67 */ 68public abstract class ViewGroup extends View implements ViewParent, ViewManager { 69 70 private static final boolean DBG = false; 71 72 /** 73 * Views which have been hidden or removed which need to be animated on 74 * their way out. 75 * This field should be made private, so it is hidden from the SDK. 76 * {@hide} 77 */ 78 protected ArrayList<View> mDisappearingChildren; 79 80 /** 81 * Listener used to propagate events indicating when children are added 82 * and/or removed from a view group. 83 * This field should be made private, so it is hidden from the SDK. 84 * {@hide} 85 */ 86 protected OnHierarchyChangeListener mOnHierarchyChangeListener; 87 88 // The view contained within this ViewGroup that has or contains focus. 89 private View mFocused; 90 91 /** 92 * A Transformation used when drawing children, to 93 * apply on the child being drawn. 94 */ 95 private final Transformation mChildTransformation = new Transformation(); 96 97 /** 98 * Used to track the current invalidation region. 99 */ 100 private RectF mInvalidateRegion; 101 102 /** 103 * A Transformation used to calculate a correct 104 * invalidation area when the application is autoscaled. 105 */ 106 private Transformation mInvalidationTransformation; 107 108 // Target of Motion events 109 private View mMotionTarget; 110 111 // Targets of MotionEvents in split mode 112 private SplitMotionTargets mSplitMotionTargets; 113 114 // Layout animation 115 private LayoutAnimationController mLayoutAnimationController; 116 private Animation.AnimationListener mAnimationListener; 117 118 /** 119 * Internal flags. 120 * 121 * This field should be made private, so it is hidden from the SDK. 122 * {@hide} 123 */ 124 protected int mGroupFlags; 125 126 // When set, ViewGroup invalidates only the child's rectangle 127 // Set by default 128 private static final int FLAG_CLIP_CHILDREN = 0x1; 129 130 // When set, ViewGroup excludes the padding area from the invalidate rectangle 131 // Set by default 132 private static final int FLAG_CLIP_TO_PADDING = 0x2; 133 134 // When set, dispatchDraw() will invoke invalidate(); this is set by drawChild() when 135 // a child needs to be invalidated and FLAG_OPTIMIZE_INVALIDATE is set 136 private static final int FLAG_INVALIDATE_REQUIRED = 0x4; 137 138 // When set, dispatchDraw() will run the layout animation and unset the flag 139 private static final int FLAG_RUN_ANIMATION = 0x8; 140 141 // When set, there is either no layout animation on the ViewGroup or the layout 142 // animation is over 143 // Set by default 144 private static final int FLAG_ANIMATION_DONE = 0x10; 145 146 // If set, this ViewGroup has padding; if unset there is no padding and we don't need 147 // to clip it, even if FLAG_CLIP_TO_PADDING is set 148 private static final int FLAG_PADDING_NOT_NULL = 0x20; 149 150 // When set, this ViewGroup caches its children in a Bitmap before starting a layout animation 151 // Set by default 152 private static final int FLAG_ANIMATION_CACHE = 0x40; 153 154 // When set, this ViewGroup converts calls to invalidate(Rect) to invalidate() during a 155 // layout animation; this avoid clobbering the hierarchy 156 // Automatically set when the layout animation starts, depending on the animation's 157 // characteristics 158 private static final int FLAG_OPTIMIZE_INVALIDATE = 0x80; 159 160 // When set, the next call to drawChild() will clear mChildTransformation's matrix 161 private static final int FLAG_CLEAR_TRANSFORMATION = 0x100; 162 163 // When set, this ViewGroup invokes mAnimationListener.onAnimationEnd() and removes 164 // the children's Bitmap caches if necessary 165 // This flag is set when the layout animation is over (after FLAG_ANIMATION_DONE is set) 166 private static final int FLAG_NOTIFY_ANIMATION_LISTENER = 0x200; 167 168 /** 169 * When set, the drawing method will call {@link #getChildDrawingOrder(int, int)} 170 * to get the index of the child to draw for that iteration. 171 * 172 * @hide 173 */ 174 protected static final int FLAG_USE_CHILD_DRAWING_ORDER = 0x400; 175 176 /** 177 * When set, this ViewGroup supports static transformations on children; this causes 178 * {@link #getChildStaticTransformation(View, android.view.animation.Transformation)} to be 179 * invoked when a child is drawn. 180 * 181 * Any subclass overriding 182 * {@link #getChildStaticTransformation(View, android.view.animation.Transformation)} should 183 * set this flags in {@link #mGroupFlags}. 184 * 185 * {@hide} 186 */ 187 protected static final int FLAG_SUPPORT_STATIC_TRANSFORMATIONS = 0x800; 188 189 // When the previous drawChild() invocation used an alpha value that was lower than 190 // 1.0 and set it in mCachePaint 191 private static final int FLAG_ALPHA_LOWER_THAN_ONE = 0x1000; 192 193 /** 194 * When set, this ViewGroup's drawable states also include those 195 * of its children. 196 */ 197 private static final int FLAG_ADD_STATES_FROM_CHILDREN = 0x2000; 198 199 /** 200 * When set, this ViewGroup tries to always draw its children using their drawing cache. 201 */ 202 private static final int FLAG_ALWAYS_DRAWN_WITH_CACHE = 0x4000; 203 204 /** 205 * When set, and if FLAG_ALWAYS_DRAWN_WITH_CACHE is not set, this ViewGroup will try to 206 * draw its children with their drawing cache. 207 */ 208 private static final int FLAG_CHILDREN_DRAWN_WITH_CACHE = 0x8000; 209 210 /** 211 * When set, this group will go through its list of children to notify them of 212 * any drawable state change. 213 */ 214 private static final int FLAG_NOTIFY_CHILDREN_ON_DRAWABLE_STATE_CHANGE = 0x10000; 215 216 private static final int FLAG_MASK_FOCUSABILITY = 0x60000; 217 218 /** 219 * This view will get focus before any of its descendants. 220 */ 221 public static final int FOCUS_BEFORE_DESCENDANTS = 0x20000; 222 223 /** 224 * This view will get focus only if none of its descendants want it. 225 */ 226 public static final int FOCUS_AFTER_DESCENDANTS = 0x40000; 227 228 /** 229 * This view will block any of its descendants from getting focus, even 230 * if they are focusable. 231 */ 232 public static final int FOCUS_BLOCK_DESCENDANTS = 0x60000; 233 234 /** 235 * Used to map between enum in attrubutes and flag values. 236 */ 237 private static final int[] DESCENDANT_FOCUSABILITY_FLAGS = 238 {FOCUS_BEFORE_DESCENDANTS, FOCUS_AFTER_DESCENDANTS, 239 FOCUS_BLOCK_DESCENDANTS}; 240 241 /** 242 * When set, this ViewGroup should not intercept touch events. 243 * {@hide} 244 */ 245 protected static final int FLAG_DISALLOW_INTERCEPT = 0x80000; 246 247 /** 248 * When set, this ViewGroup will split MotionEvents to multiple child Views when appropriate. 249 */ 250 private static final int FLAG_SPLIT_MOTION_EVENTS = 0x100000; 251 252 /** 253 * Indicates which types of drawing caches are to be kept in memory. 254 * This field should be made private, so it is hidden from the SDK. 255 * {@hide} 256 */ 257 protected int mPersistentDrawingCache; 258 259 /** 260 * Used to indicate that no drawing cache should be kept in memory. 261 */ 262 public static final int PERSISTENT_NO_CACHE = 0x0; 263 264 /** 265 * Used to indicate that the animation drawing cache should be kept in memory. 266 */ 267 public static final int PERSISTENT_ANIMATION_CACHE = 0x1; 268 269 /** 270 * Used to indicate that the scrolling drawing cache should be kept in memory. 271 */ 272 public static final int PERSISTENT_SCROLLING_CACHE = 0x2; 273 274 /** 275 * Used to indicate that all drawing caches should be kept in memory. 276 */ 277 public static final int PERSISTENT_ALL_CACHES = 0x3; 278 279 /** 280 * We clip to padding when FLAG_CLIP_TO_PADDING and FLAG_PADDING_NOT_NULL 281 * are set at the same time. 282 */ 283 protected static final int CLIP_TO_PADDING_MASK = FLAG_CLIP_TO_PADDING | FLAG_PADDING_NOT_NULL; 284 285 // Index of the child's left position in the mLocation array 286 private static final int CHILD_LEFT_INDEX = 0; 287 // Index of the child's top position in the mLocation array 288 private static final int CHILD_TOP_INDEX = 1; 289 290 // Child views of this ViewGroup 291 private View[] mChildren; 292 // Number of valid children in the mChildren array, the rest should be null or not 293 // considered as children 294 private int mChildrenCount; 295 296 private static final int ARRAY_INITIAL_CAPACITY = 12; 297 private static final int ARRAY_CAPACITY_INCREMENT = 12; 298 299 // Used to draw cached views 300 private final Paint mCachePaint = new Paint(); 301 302 // Used to animate add/remove changes in layout 303 private LayoutTransition mTransition; 304 305 // The set of views that are currently being transitioned. This list is used to track views 306 // being removed that should not actually be removed from the parent yet because they are 307 // being animated. 308 private ArrayList<View> mTransitioningViews; 309 310 public ViewGroup(Context context) { 311 super(context); 312 initViewGroup(); 313 } 314 315 public ViewGroup(Context context, AttributeSet attrs) { 316 super(context, attrs); 317 initViewGroup(); 318 initFromAttributes(context, attrs); 319 } 320 321 public ViewGroup(Context context, AttributeSet attrs, int defStyle) { 322 super(context, attrs, defStyle); 323 initViewGroup(); 324 initFromAttributes(context, attrs); 325 } 326 327 private void initViewGroup() { 328 // ViewGroup doesn't draw by default 329 setFlags(WILL_NOT_DRAW, DRAW_MASK); 330 mGroupFlags |= FLAG_CLIP_CHILDREN; 331 mGroupFlags |= FLAG_CLIP_TO_PADDING; 332 mGroupFlags |= FLAG_ANIMATION_DONE; 333 mGroupFlags |= FLAG_ANIMATION_CACHE; 334 mGroupFlags |= FLAG_ALWAYS_DRAWN_WITH_CACHE; 335 336 setDescendantFocusability(FOCUS_BEFORE_DESCENDANTS); 337 338 mChildren = new View[ARRAY_INITIAL_CAPACITY]; 339 mChildrenCount = 0; 340 341 mCachePaint.setDither(false); 342 343 mPersistentDrawingCache = PERSISTENT_SCROLLING_CACHE; 344 } 345 346 private void initFromAttributes(Context context, AttributeSet attrs) { 347 TypedArray a = context.obtainStyledAttributes(attrs, 348 R.styleable.ViewGroup); 349 350 final int N = a.getIndexCount(); 351 for (int i = 0; i < N; i++) { 352 int attr = a.getIndex(i); 353 switch (attr) { 354 case R.styleable.ViewGroup_clipChildren: 355 setClipChildren(a.getBoolean(attr, true)); 356 break; 357 case R.styleable.ViewGroup_clipToPadding: 358 setClipToPadding(a.getBoolean(attr, true)); 359 break; 360 case R.styleable.ViewGroup_animationCache: 361 setAnimationCacheEnabled(a.getBoolean(attr, true)); 362 break; 363 case R.styleable.ViewGroup_persistentDrawingCache: 364 setPersistentDrawingCache(a.getInt(attr, PERSISTENT_SCROLLING_CACHE)); 365 break; 366 case R.styleable.ViewGroup_addStatesFromChildren: 367 setAddStatesFromChildren(a.getBoolean(attr, false)); 368 break; 369 case R.styleable.ViewGroup_alwaysDrawnWithCache: 370 setAlwaysDrawnWithCacheEnabled(a.getBoolean(attr, true)); 371 break; 372 case R.styleable.ViewGroup_layoutAnimation: 373 int id = a.getResourceId(attr, -1); 374 if (id > 0) { 375 setLayoutAnimation(AnimationUtils.loadLayoutAnimation(mContext, id)); 376 } 377 break; 378 case R.styleable.ViewGroup_descendantFocusability: 379 setDescendantFocusability(DESCENDANT_FOCUSABILITY_FLAGS[a.getInt(attr, 0)]); 380 break; 381 case R.styleable.ViewGroup_splitMotionEvents: 382 setMotionEventSplittingEnabled(a.getBoolean(attr, false)); 383 break; 384 case R.styleable.ViewGroup_animateLayoutChanges: 385 boolean animateLayoutChanges = a.getBoolean(attr, false); 386 if (animateLayoutChanges) { 387 setLayoutTransition(new LayoutTransition()); 388 } 389 break; 390 } 391 } 392 393 a.recycle(); 394 } 395 396 /** 397 * Gets the descendant focusability of this view group. The descendant 398 * focusability defines the relationship between this view group and its 399 * descendants when looking for a view to take focus in 400 * {@link #requestFocus(int, android.graphics.Rect)}. 401 * 402 * @return one of {@link #FOCUS_BEFORE_DESCENDANTS}, {@link #FOCUS_AFTER_DESCENDANTS}, 403 * {@link #FOCUS_BLOCK_DESCENDANTS}. 404 */ 405 @ViewDebug.ExportedProperty(category = "focus", mapping = { 406 @ViewDebug.IntToString(from = FOCUS_BEFORE_DESCENDANTS, to = "FOCUS_BEFORE_DESCENDANTS"), 407 @ViewDebug.IntToString(from = FOCUS_AFTER_DESCENDANTS, to = "FOCUS_AFTER_DESCENDANTS"), 408 @ViewDebug.IntToString(from = FOCUS_BLOCK_DESCENDANTS, to = "FOCUS_BLOCK_DESCENDANTS") 409 }) 410 public int getDescendantFocusability() { 411 return mGroupFlags & FLAG_MASK_FOCUSABILITY; 412 } 413 414 /** 415 * Set the descendant focusability of this view group. This defines the relationship 416 * between this view group and its descendants when looking for a view to 417 * take focus in {@link #requestFocus(int, android.graphics.Rect)}. 418 * 419 * @param focusability one of {@link #FOCUS_BEFORE_DESCENDANTS}, {@link #FOCUS_AFTER_DESCENDANTS}, 420 * {@link #FOCUS_BLOCK_DESCENDANTS}. 421 */ 422 public void setDescendantFocusability(int focusability) { 423 switch (focusability) { 424 case FOCUS_BEFORE_DESCENDANTS: 425 case FOCUS_AFTER_DESCENDANTS: 426 case FOCUS_BLOCK_DESCENDANTS: 427 break; 428 default: 429 throw new IllegalArgumentException("must be one of FOCUS_BEFORE_DESCENDANTS, " 430 + "FOCUS_AFTER_DESCENDANTS, FOCUS_BLOCK_DESCENDANTS"); 431 } 432 mGroupFlags &= ~FLAG_MASK_FOCUSABILITY; 433 mGroupFlags |= (focusability & FLAG_MASK_FOCUSABILITY); 434 } 435 436 /** 437 * {@inheritDoc} 438 */ 439 @Override 440 void handleFocusGainInternal(int direction, Rect previouslyFocusedRect) { 441 if (mFocused != null) { 442 mFocused.unFocus(); 443 mFocused = null; 444 } 445 super.handleFocusGainInternal(direction, previouslyFocusedRect); 446 } 447 448 /** 449 * {@inheritDoc} 450 */ 451 public void requestChildFocus(View child, View focused) { 452 if (DBG) { 453 System.out.println(this + " requestChildFocus()"); 454 } 455 if (getDescendantFocusability() == FOCUS_BLOCK_DESCENDANTS) { 456 return; 457 } 458 459 // Unfocus us, if necessary 460 super.unFocus(); 461 462 // We had a previous notion of who had focus. Clear it. 463 if (mFocused != child) { 464 if (mFocused != null) { 465 mFocused.unFocus(); 466 } 467 468 mFocused = child; 469 } 470 if (mParent != null) { 471 mParent.requestChildFocus(this, focused); 472 } 473 } 474 475 /** 476 * {@inheritDoc} 477 */ 478 public void focusableViewAvailable(View v) { 479 if (mParent != null 480 // shortcut: don't report a new focusable view if we block our descendants from 481 // getting focus 482 && (getDescendantFocusability() != FOCUS_BLOCK_DESCENDANTS) 483 // shortcut: don't report a new focusable view if we already are focused 484 // (and we don't prefer our descendants) 485 // 486 // note: knowing that mFocused is non-null is not a good enough reason 487 // to break the traversal since in that case we'd actually have to find 488 // the focused view and make sure it wasn't FOCUS_AFTER_DESCENDANTS and 489 // an ancestor of v; this will get checked for at ViewRoot 490 && !(isFocused() && getDescendantFocusability() != FOCUS_AFTER_DESCENDANTS)) { 491 mParent.focusableViewAvailable(v); 492 } 493 } 494 495 /** 496 * {@inheritDoc} 497 */ 498 public boolean showContextMenuForChild(View originalView) { 499 return mParent != null && mParent.showContextMenuForChild(originalView); 500 } 501 502 /** 503 * {@inheritDoc} 504 */ 505 public ActionMode startActionModeForChild(View originalView, ActionMode.Callback callback) { 506 return mParent != null ? mParent.startActionModeForChild(originalView, callback) : null; 507 } 508 509 /** 510 * Find the nearest view in the specified direction that wants to take 511 * focus. 512 * 513 * @param focused The view that currently has focus 514 * @param direction One of FOCUS_UP, FOCUS_DOWN, FOCUS_LEFT, and 515 * FOCUS_RIGHT, or 0 for not applicable. 516 */ 517 public View focusSearch(View focused, int direction) { 518 if (isRootNamespace()) { 519 // root namespace means we should consider ourselves the top of the 520 // tree for focus searching; otherwise we could be focus searching 521 // into other tabs. see LocalActivityManager and TabHost for more info 522 return FocusFinder.getInstance().findNextFocus(this, focused, direction); 523 } else if (mParent != null) { 524 return mParent.focusSearch(focused, direction); 525 } 526 return null; 527 } 528 529 /** 530 * {@inheritDoc} 531 */ 532 public boolean requestChildRectangleOnScreen(View child, Rect rectangle, boolean immediate) { 533 return false; 534 } 535 536 /** 537 * {@inheritDoc} 538 */ 539 @Override 540 public boolean dispatchUnhandledMove(View focused, int direction) { 541 return mFocused != null && 542 mFocused.dispatchUnhandledMove(focused, direction); 543 } 544 545 /** 546 * {@inheritDoc} 547 */ 548 public void clearChildFocus(View child) { 549 if (DBG) { 550 System.out.println(this + " clearChildFocus()"); 551 } 552 553 mFocused = null; 554 if (mParent != null) { 555 mParent.clearChildFocus(this); 556 } 557 } 558 559 /** 560 * {@inheritDoc} 561 */ 562 @Override 563 public void clearFocus() { 564 super.clearFocus(); 565 566 // clear any child focus if it exists 567 if (mFocused != null) { 568 mFocused.clearFocus(); 569 } 570 } 571 572 /** 573 * {@inheritDoc} 574 */ 575 @Override 576 void unFocus() { 577 if (DBG) { 578 System.out.println(this + " unFocus()"); 579 } 580 581 super.unFocus(); 582 if (mFocused != null) { 583 mFocused.unFocus(); 584 } 585 mFocused = null; 586 } 587 588 /** 589 * Returns the focused child of this view, if any. The child may have focus 590 * or contain focus. 591 * 592 * @return the focused child or null. 593 */ 594 public View getFocusedChild() { 595 return mFocused; 596 } 597 598 /** 599 * Returns true if this view has or contains focus 600 * 601 * @return true if this view has or contains focus 602 */ 603 @Override 604 public boolean hasFocus() { 605 return (mPrivateFlags & FOCUSED) != 0 || mFocused != null; 606 } 607 608 /* 609 * (non-Javadoc) 610 * 611 * @see android.view.View#findFocus() 612 */ 613 @Override 614 public View findFocus() { 615 if (DBG) { 616 System.out.println("Find focus in " + this + ": flags=" 617 + isFocused() + ", child=" + mFocused); 618 } 619 620 if (isFocused()) { 621 return this; 622 } 623 624 if (mFocused != null) { 625 return mFocused.findFocus(); 626 } 627 return null; 628 } 629 630 /** 631 * {@inheritDoc} 632 */ 633 @Override 634 public boolean hasFocusable() { 635 if ((mViewFlags & VISIBILITY_MASK) != VISIBLE) { 636 return false; 637 } 638 639 if (isFocusable()) { 640 return true; 641 } 642 643 final int descendantFocusability = getDescendantFocusability(); 644 if (descendantFocusability != FOCUS_BLOCK_DESCENDANTS) { 645 final int count = mChildrenCount; 646 final View[] children = mChildren; 647 648 for (int i = 0; i < count; i++) { 649 final View child = children[i]; 650 if (child.hasFocusable()) { 651 return true; 652 } 653 } 654 } 655 656 return false; 657 } 658 659 /** 660 * {@inheritDoc} 661 */ 662 @Override 663 public void addFocusables(ArrayList<View> views, int direction) { 664 addFocusables(views, direction, FOCUSABLES_TOUCH_MODE); 665 } 666 667 /** 668 * {@inheritDoc} 669 */ 670 @Override 671 public void addFocusables(ArrayList<View> views, int direction, int focusableMode) { 672 final int focusableCount = views.size(); 673 674 final int descendantFocusability = getDescendantFocusability(); 675 676 if (descendantFocusability != FOCUS_BLOCK_DESCENDANTS) { 677 final int count = mChildrenCount; 678 final View[] children = mChildren; 679 680 for (int i = 0; i < count; i++) { 681 final View child = children[i]; 682 if ((child.mViewFlags & VISIBILITY_MASK) == VISIBLE) { 683 child.addFocusables(views, direction, focusableMode); 684 } 685 } 686 } 687 688 // we add ourselves (if focusable) in all cases except for when we are 689 // FOCUS_AFTER_DESCENDANTS and there are some descendants focusable. this is 690 // to avoid the focus search finding layouts when a more precise search 691 // among the focusable children would be more interesting. 692 if ( 693 descendantFocusability != FOCUS_AFTER_DESCENDANTS || 694 // No focusable descendants 695 (focusableCount == views.size())) { 696 super.addFocusables(views, direction, focusableMode); 697 } 698 } 699 700 /** 701 * {@inheritDoc} 702 */ 703 @Override 704 public void dispatchWindowFocusChanged(boolean hasFocus) { 705 super.dispatchWindowFocusChanged(hasFocus); 706 final int count = mChildrenCount; 707 final View[] children = mChildren; 708 for (int i = 0; i < count; i++) { 709 children[i].dispatchWindowFocusChanged(hasFocus); 710 } 711 } 712 713 /** 714 * {@inheritDoc} 715 */ 716 @Override 717 public void addTouchables(ArrayList<View> views) { 718 super.addTouchables(views); 719 720 final int count = mChildrenCount; 721 final View[] children = mChildren; 722 723 for (int i = 0; i < count; i++) { 724 final View child = children[i]; 725 if ((child.mViewFlags & VISIBILITY_MASK) == VISIBLE) { 726 child.addTouchables(views); 727 } 728 } 729 } 730 731 /** 732 * {@inheritDoc} 733 */ 734 @Override 735 public void dispatchDisplayHint(int hint) { 736 super.dispatchDisplayHint(hint); 737 final int count = mChildrenCount; 738 final View[] children = mChildren; 739 for (int i = 0; i < count; i++) { 740 children[i].dispatchDisplayHint(hint); 741 } 742 } 743 744 /** 745 * {@inheritDoc} 746 */ 747 @Override 748 protected void dispatchVisibilityChanged(View changedView, int visibility) { 749 super.dispatchVisibilityChanged(changedView, visibility); 750 final int count = mChildrenCount; 751 final View[] children = mChildren; 752 for (int i = 0; i < count; i++) { 753 children[i].dispatchVisibilityChanged(changedView, visibility); 754 } 755 } 756 757 /** 758 * {@inheritDoc} 759 */ 760 @Override 761 public void dispatchWindowVisibilityChanged(int visibility) { 762 super.dispatchWindowVisibilityChanged(visibility); 763 final int count = mChildrenCount; 764 final View[] children = mChildren; 765 for (int i = 0; i < count; i++) { 766 children[i].dispatchWindowVisibilityChanged(visibility); 767 } 768 } 769 770 /** 771 * {@inheritDoc} 772 */ 773 @Override 774 public void dispatchConfigurationChanged(Configuration newConfig) { 775 super.dispatchConfigurationChanged(newConfig); 776 final int count = mChildrenCount; 777 final View[] children = mChildren; 778 for (int i = 0; i < count; i++) { 779 children[i].dispatchConfigurationChanged(newConfig); 780 } 781 } 782 783 /** 784 * {@inheritDoc} 785 */ 786 public void recomputeViewAttributes(View child) { 787 ViewParent parent = mParent; 788 if (parent != null) parent.recomputeViewAttributes(this); 789 } 790 791 @Override 792 void dispatchCollectViewAttributes(int visibility) { 793 visibility |= mViewFlags&VISIBILITY_MASK; 794 super.dispatchCollectViewAttributes(visibility); 795 final int count = mChildrenCount; 796 final View[] children = mChildren; 797 for (int i = 0; i < count; i++) { 798 children[i].dispatchCollectViewAttributes(visibility); 799 } 800 } 801 802 /** 803 * {@inheritDoc} 804 */ 805 public void bringChildToFront(View child) { 806 int index = indexOfChild(child); 807 if (index >= 0) { 808 removeFromArray(index); 809 addInArray(child, mChildrenCount); 810 child.mParent = this; 811 } 812 } 813 814 /** 815 * {@inheritDoc} 816 */ 817 @Override 818 public boolean dispatchKeyEventPreIme(KeyEvent event) { 819 if ((mPrivateFlags & (FOCUSED | HAS_BOUNDS)) == (FOCUSED | HAS_BOUNDS)) { 820 return super.dispatchKeyEventPreIme(event); 821 } else if (mFocused != null && (mFocused.mPrivateFlags & HAS_BOUNDS) == HAS_BOUNDS) { 822 return mFocused.dispatchKeyEventPreIme(event); 823 } 824 return false; 825 } 826 827 /** 828 * {@inheritDoc} 829 */ 830 @Override 831 public boolean dispatchKeyEvent(KeyEvent event) { 832 if ((mPrivateFlags & (FOCUSED | HAS_BOUNDS)) == (FOCUSED | HAS_BOUNDS)) { 833 return super.dispatchKeyEvent(event); 834 } else if (mFocused != null && (mFocused.mPrivateFlags & HAS_BOUNDS) == HAS_BOUNDS) { 835 return mFocused.dispatchKeyEvent(event); 836 } 837 return false; 838 } 839 840 /** 841 * {@inheritDoc} 842 */ 843 @Override 844 public boolean dispatchKeyShortcutEvent(KeyEvent event) { 845 if ((mPrivateFlags & (FOCUSED | HAS_BOUNDS)) == (FOCUSED | HAS_BOUNDS)) { 846 return super.dispatchKeyShortcutEvent(event); 847 } else if (mFocused != null && (mFocused.mPrivateFlags & HAS_BOUNDS) == HAS_BOUNDS) { 848 return mFocused.dispatchKeyShortcutEvent(event); 849 } 850 return false; 851 } 852 853 /** 854 * {@inheritDoc} 855 */ 856 @Override 857 public boolean dispatchTrackballEvent(MotionEvent event) { 858 if ((mPrivateFlags & (FOCUSED | HAS_BOUNDS)) == (FOCUSED | HAS_BOUNDS)) { 859 return super.dispatchTrackballEvent(event); 860 } else if (mFocused != null && (mFocused.mPrivateFlags & HAS_BOUNDS) == HAS_BOUNDS) { 861 return mFocused.dispatchTrackballEvent(event); 862 } 863 return false; 864 } 865 866 /** 867 * {@inheritDoc} 868 */ 869 @Override 870 public boolean dispatchTouchEvent(MotionEvent ev) { 871 if (!onFilterTouchEventForSecurity(ev)) { 872 return false; 873 } 874 875 if ((mGroupFlags & FLAG_SPLIT_MOTION_EVENTS) == FLAG_SPLIT_MOTION_EVENTS) { 876 if (mSplitMotionTargets == null) { 877 mSplitMotionTargets = new SplitMotionTargets(); 878 } 879 return dispatchSplitTouchEvent(ev); 880 } 881 882 final int action = ev.getAction(); 883 final float xf = ev.getX(); 884 final float yf = ev.getY(); 885 final float scrolledXFloat = xf + mScrollX; 886 final float scrolledYFloat = yf + mScrollY; 887 888 boolean disallowIntercept = (mGroupFlags & FLAG_DISALLOW_INTERCEPT) != 0; 889 890 if (action == MotionEvent.ACTION_DOWN) { 891 if (mMotionTarget != null) { 892 // this is weird, we got a pen down, but we thought it was 893 // already down! 894 // XXX: We should probably send an ACTION_UP to the current 895 // target. 896 mMotionTarget = null; 897 } 898 // If we're disallowing intercept or if we're allowing and we didn't 899 // intercept 900 if (disallowIntercept || !onInterceptTouchEvent(ev)) { 901 // reset this event's action (just to protect ourselves) 902 ev.setAction(MotionEvent.ACTION_DOWN); 903 // We know we want to dispatch the event down, find a child 904 // who can handle it, start with the front-most child. 905 final View[] children = mChildren; 906 final int count = mChildrenCount; 907 for (int i = count - 1; i >= 0; i--) { 908 final View child = children[i]; 909 if ((child.mViewFlags & VISIBILITY_MASK) == VISIBLE 910 || child.getAnimation() != null) { 911 // Single dispatch always picks its target based on the initial down 912 // event's position - index 0 913 if (dispatchTouchEventIfInView(child, ev, 0)) { 914 mMotionTarget = child; 915 return true; 916 } 917 } 918 } 919 } 920 } 921 922 boolean isUpOrCancel = (action == MotionEvent.ACTION_UP) || 923 (action == MotionEvent.ACTION_CANCEL); 924 925 if (isUpOrCancel) { 926 // Note, we've already copied the previous state to our local 927 // variable, so this takes effect on the next event 928 mGroupFlags &= ~FLAG_DISALLOW_INTERCEPT; 929 } 930 931 // The event wasn't an ACTION_DOWN, dispatch it to our target if 932 // we have one. 933 final View target = mMotionTarget; 934 if (target == null) { 935 // We don't have a target, this means we're handling the 936 // event as a regular view. 937 ev.setLocation(xf, yf); 938 if ((mPrivateFlags & CANCEL_NEXT_UP_EVENT) != 0) { 939 ev.setAction(MotionEvent.ACTION_CANCEL); 940 mPrivateFlags &= ~CANCEL_NEXT_UP_EVENT; 941 } 942 return super.dispatchTouchEvent(ev); 943 } 944 945 // Calculate the offset point into the target's local coordinates 946 float xc = scrolledXFloat - (float) target.mLeft; 947 float yc = scrolledYFloat - (float) target.mTop; 948 if (!target.hasIdentityMatrix() && mAttachInfo != null) { 949 // non-identity matrix: transform the point into the view's coordinates 950 final float[] localXY = mAttachInfo.mTmpTransformLocation; 951 localXY[0] = xc; 952 localXY[1] = yc; 953 target.getInverseMatrix().mapPoints(localXY); 954 xc = localXY[0]; 955 yc = localXY[1]; 956 } 957 958 // if have a target, see if we're allowed to and want to intercept its 959 // events 960 if (!disallowIntercept && onInterceptTouchEvent(ev)) { 961 mPrivateFlags &= ~CANCEL_NEXT_UP_EVENT; 962 ev.setAction(MotionEvent.ACTION_CANCEL); 963 ev.setLocation(xc, yc); 964 if (!target.dispatchTouchEvent(ev)) { 965 // target didn't handle ACTION_CANCEL. not much we can do 966 // but they should have. 967 } 968 // clear the target 969 mMotionTarget = null; 970 // Don't dispatch this event to our own view, because we already 971 // saw it when intercepting; we just want to give the following 972 // event to the normal onTouchEvent(). 973 return true; 974 } 975 976 if (isUpOrCancel) { 977 mMotionTarget = null; 978 } 979 980 // finally offset the event to the target's coordinate system and 981 // dispatch the event. 982 ev.setLocation(xc, yc); 983 984 if ((target.mPrivateFlags & CANCEL_NEXT_UP_EVENT) != 0) { 985 ev.setAction(MotionEvent.ACTION_CANCEL); 986 target.mPrivateFlags &= ~CANCEL_NEXT_UP_EVENT; 987 mMotionTarget = null; 988 } 989 990 if (target.dispatchTouchEvent(ev)) { 991 return true; 992 } else { 993 ev.setLocation(xf, yf); 994 } 995 return false; 996 } 997 998 /** 999 * This method detects whether the pointer location at <code>pointerIndex</code> within 1000 * <code>ev</code> is inside the specified view. If so, the transformed event is dispatched to 1001 * <code>child</code>. 1002 * 1003 * @param child View to hit test against 1004 * @param ev MotionEvent to test 1005 * @param pointerIndex Index of the pointer within <code>ev</code> to test 1006 * @return <code>false</code> if the hit test failed, or the result of 1007 * <code>child.dispatchTouchEvent</code> 1008 */ 1009 private boolean dispatchTouchEventIfInView(View child, MotionEvent ev, int pointerIndex) { 1010 final float x = ev.getX(pointerIndex); 1011 final float y = ev.getY(pointerIndex); 1012 final float scrolledX = x + mScrollX; 1013 final float scrolledY = y + mScrollY; 1014 float localX = scrolledX - child.mLeft; 1015 float localY = scrolledY - child.mTop; 1016 if (!child.hasIdentityMatrix() && mAttachInfo != null) { 1017 // non-identity matrix: transform the point into the view's coordinates 1018 final float[] localXY = mAttachInfo.mTmpTransformLocation; 1019 localXY[0] = localX; 1020 localXY[1] = localY; 1021 child.getInverseMatrix().mapPoints(localXY); 1022 localX = localXY[0]; 1023 localY = localXY[1]; 1024 } 1025 if (localX >= 0 && localY >= 0 && localX < (child.mRight - child.mLeft) && 1026 localY < (child.mBottom - child.mTop)) { 1027 // It would be safer to clone the event here but we don't for performance. 1028 // There are many subtle interactions in touch event dispatch; change at your own risk. 1029 child.mPrivateFlags &= ~CANCEL_NEXT_UP_EVENT; 1030 ev.offsetLocation(localX - x, localY - y); 1031 if (child.dispatchTouchEvent(ev)) { 1032 return true; 1033 } else { 1034 ev.offsetLocation(x - localX, y - localY); 1035 return false; 1036 } 1037 } 1038 return false; 1039 } 1040 1041 private boolean dispatchSplitTouchEvent(MotionEvent ev) { 1042 final SplitMotionTargets targets = mSplitMotionTargets; 1043 final int action = ev.getAction(); 1044 final int maskedAction = ev.getActionMasked(); 1045 float xf = ev.getX(); 1046 float yf = ev.getY(); 1047 float scrolledXFloat = xf + mScrollX; 1048 float scrolledYFloat = yf + mScrollY; 1049 1050 boolean disallowIntercept = (mGroupFlags & FLAG_DISALLOW_INTERCEPT) != 0; 1051 1052 if (maskedAction == MotionEvent.ACTION_DOWN || 1053 maskedAction == MotionEvent.ACTION_POINTER_DOWN) { 1054 final int actionIndex = ev.getActionIndex(); 1055 final int actionId = ev.getPointerId(actionIndex); 1056 1057 // Clear out any current target for this ID. 1058 // XXX: We should probably send an ACTION_UP to the current 1059 // target if present. 1060 targets.removeById(actionId); 1061 1062 // If we're disallowing intercept or if we're allowing and we didn't 1063 // intercept 1064 if (disallowIntercept || !onInterceptTouchEvent(ev)) { 1065 // reset this event's action (just to protect ourselves) 1066 ev.setAction(action); 1067 // We know we want to dispatch the event down, try to find a child 1068 // who can handle it, start with the front-most child. 1069 final long downTime = ev.getEventTime(); 1070 final View[] children = mChildren; 1071 final int count = mChildrenCount; 1072 for (int i = count - 1; i >= 0; i--) { 1073 final View child = children[i]; 1074 if ((child.mViewFlags & VISIBILITY_MASK) == VISIBLE 1075 || child.getAnimation() != null) { 1076 final MotionEvent childEvent = 1077 targets.filterMotionEventForChild(ev, child, downTime); 1078 if (childEvent != null) { 1079 try { 1080 final int childActionIndex = childEvent.findPointerIndex(actionId); 1081 if (dispatchTouchEventIfInView(child, childEvent, 1082 childActionIndex)) { 1083 targets.add(actionId, child, downTime); 1084 1085 return true; 1086 } 1087 } finally { 1088 childEvent.recycle(); 1089 } 1090 } 1091 } 1092 } 1093 1094 // Didn't find a new target. Do we have a "primary" target to send to? 1095 final SplitMotionTargets.TargetInfo primaryTargetInfo = targets.getPrimaryTarget(); 1096 if (primaryTargetInfo != null) { 1097 final View primaryTarget = primaryTargetInfo.view; 1098 final MotionEvent childEvent = targets.filterMotionEventForChild(ev, 1099 primaryTarget, primaryTargetInfo.downTime); 1100 if (childEvent != null) { 1101 try { 1102 // Calculate the offset point into the target's local coordinates 1103 float xc = scrolledXFloat - (float) primaryTarget.mLeft; 1104 float yc = scrolledYFloat - (float) primaryTarget.mTop; 1105 if (!primaryTarget.hasIdentityMatrix() && mAttachInfo != null) { 1106 // non-identity matrix: transform the point into the view's 1107 // coordinates 1108 final float[] localXY = mAttachInfo.mTmpTransformLocation; 1109 localXY[0] = xc; 1110 localXY[1] = yc; 1111 primaryTarget.getInverseMatrix().mapPoints(localXY); 1112 xc = localXY[0]; 1113 yc = localXY[1]; 1114 } 1115 childEvent.setLocation(xc, yc); 1116 if (primaryTarget.dispatchTouchEvent(childEvent)) { 1117 targets.add(actionId, primaryTarget, primaryTargetInfo.downTime); 1118 return true; 1119 } 1120 } finally { 1121 childEvent.recycle(); 1122 } 1123 } 1124 } 1125 } 1126 } 1127 1128 boolean isUpOrCancel = (action == MotionEvent.ACTION_UP) || 1129 (action == MotionEvent.ACTION_CANCEL); 1130 1131 if (isUpOrCancel) { 1132 // Note, we've already copied the previous state to our local 1133 // variable, so this takes effect on the next event 1134 mGroupFlags &= ~FLAG_DISALLOW_INTERCEPT; 1135 } 1136 1137 if (targets.isEmpty()) { 1138 // We don't have any targets, this means we're handling the 1139 // event as a regular view. 1140 ev.setLocation(xf, yf); 1141 if ((mPrivateFlags & CANCEL_NEXT_UP_EVENT) != 0) { 1142 ev.setAction(MotionEvent.ACTION_CANCEL); 1143 mPrivateFlags &= ~CANCEL_NEXT_UP_EVENT; 1144 } 1145 return super.dispatchTouchEvent(ev); 1146 } 1147 1148 // if we have targets, see if we're allowed to and want to intercept their 1149 // events 1150 int uniqueTargetCount = targets.getUniqueTargetCount(); 1151 if (!disallowIntercept && onInterceptTouchEvent(ev)) { 1152 mPrivateFlags &= ~CANCEL_NEXT_UP_EVENT; 1153 1154 for (int uniqueIndex = 0; uniqueIndex < uniqueTargetCount; uniqueIndex++) { 1155 final View target = targets.getUniqueTargetAt(uniqueIndex).view; 1156 1157 // Calculate the offset point into the target's local coordinates 1158 float xc = scrolledXFloat - (float) target.mLeft; 1159 float yc = scrolledYFloat - (float) target.mTop; 1160 if (!target.hasIdentityMatrix() && mAttachInfo != null) { 1161 // non-identity matrix: transform the point into the view's coordinates 1162 final float[] localXY = mAttachInfo.mTmpTransformLocation; 1163 localXY[0] = xc; 1164 localXY[1] = yc; 1165 target.getInverseMatrix().mapPoints(localXY); 1166 xc = localXY[0]; 1167 yc = localXY[1]; 1168 } 1169 1170 ev.setAction(MotionEvent.ACTION_CANCEL); 1171 ev.setLocation(xc, yc); 1172 if (!target.dispatchTouchEvent(ev)) { 1173 // target didn't handle ACTION_CANCEL. not much we can do 1174 // but they should have. 1175 } 1176 } 1177 targets.clear(); 1178 // Don't dispatch this event to our own view, because we already 1179 // saw it when intercepting; we just want to give the following 1180 // event to the normal onTouchEvent(). 1181 return true; 1182 } 1183 1184 boolean handled = false; 1185 for (int uniqueIndex = 0; uniqueIndex < uniqueTargetCount; uniqueIndex++) { 1186 final SplitMotionTargets.TargetInfo targetInfo = targets.getUniqueTargetAt(uniqueIndex); 1187 final View target = targetInfo.view; 1188 1189 final MotionEvent targetEvent = 1190 targets.filterMotionEventForChild(ev, target, targetInfo.downTime); 1191 if (targetEvent == null) { 1192 continue; 1193 } 1194 1195 try { 1196 // Calculate the offset point into the target's local coordinates 1197 xf = targetEvent.getX(); 1198 yf = targetEvent.getY(); 1199 scrolledXFloat = xf + mScrollX; 1200 scrolledYFloat = yf + mScrollY; 1201 float xc = scrolledXFloat - (float) target.mLeft; 1202 float yc = scrolledYFloat - (float) target.mTop; 1203 if (!target.hasIdentityMatrix() && mAttachInfo != null) { 1204 // non-identity matrix: transform the point into the view's coordinates 1205 final float[] localXY = mAttachInfo.mTmpTransformLocation; 1206 localXY[0] = xc; 1207 localXY[1] = yc; 1208 target.getInverseMatrix().mapPoints(localXY); 1209 xc = localXY[0]; 1210 yc = localXY[1]; 1211 } 1212 1213 // finally offset the event to the target's coordinate system and 1214 // dispatch the event. 1215 targetEvent.setLocation(xc, yc); 1216 1217 if ((target.mPrivateFlags & CANCEL_NEXT_UP_EVENT) != 0) { 1218 targetEvent.setAction(MotionEvent.ACTION_CANCEL); 1219 target.mPrivateFlags &= ~CANCEL_NEXT_UP_EVENT; 1220 targets.removeView(target); 1221 uniqueIndex--; 1222 uniqueTargetCount--; 1223 } 1224 1225 handled |= target.dispatchTouchEvent(targetEvent); 1226 } finally { 1227 targetEvent.recycle(); 1228 } 1229 } 1230 1231 if (maskedAction == MotionEvent.ACTION_POINTER_UP) { 1232 final int removeId = ev.getPointerId(ev.getActionIndex()); 1233 targets.removeById(removeId); 1234 } 1235 1236 if (isUpOrCancel) { 1237 targets.clear(); 1238 } 1239 1240 return handled; 1241 } 1242 1243 /** 1244 * Enable or disable the splitting of MotionEvents to multiple children during touch event 1245 * dispatch. This behavior is disabled by default. 1246 * 1247 * <p>When this option is enabled MotionEvents may be split and dispatched to different child 1248 * views depending on where each pointer initially went down. This allows for user interactions 1249 * such as scrolling two panes of content independently, chording of buttons, and performing 1250 * independent gestures on different pieces of content. 1251 * 1252 * @param split <code>true</code> to allow MotionEvents to be split and dispatched to multiple 1253 * child views. <code>false</code> to only allow one child view to be the target of 1254 * any MotionEvent received by this ViewGroup. 1255 */ 1256 public void setMotionEventSplittingEnabled(boolean split) { 1257 // TODO Applications really shouldn't change this setting mid-touch event, 1258 // but perhaps this should handle that case and send ACTION_CANCELs to any child views 1259 // with gestures in progress when this is changed. 1260 if (split) { 1261 mGroupFlags |= FLAG_SPLIT_MOTION_EVENTS; 1262 } else { 1263 mGroupFlags &= ~FLAG_SPLIT_MOTION_EVENTS; 1264 mSplitMotionTargets = null; 1265 } 1266 } 1267 1268 /** 1269 * @return true if MotionEvents dispatched to this ViewGroup can be split to multiple children. 1270 */ 1271 public boolean isMotionEventSplittingEnabled() { 1272 return (mGroupFlags & FLAG_SPLIT_MOTION_EVENTS) == FLAG_SPLIT_MOTION_EVENTS; 1273 } 1274 1275 /** 1276 * {@inheritDoc} 1277 */ 1278 public void requestDisallowInterceptTouchEvent(boolean disallowIntercept) { 1279 1280 if (disallowIntercept == ((mGroupFlags & FLAG_DISALLOW_INTERCEPT) != 0)) { 1281 // We're already in this state, assume our ancestors are too 1282 return; 1283 } 1284 1285 if (disallowIntercept) { 1286 mGroupFlags |= FLAG_DISALLOW_INTERCEPT; 1287 } else { 1288 mGroupFlags &= ~FLAG_DISALLOW_INTERCEPT; 1289 } 1290 1291 // Pass it up to our parent 1292 if (mParent != null) { 1293 mParent.requestDisallowInterceptTouchEvent(disallowIntercept); 1294 } 1295 } 1296 1297 /** 1298 * Implement this method to intercept all touch screen motion events. This 1299 * allows you to watch events as they are dispatched to your children, and 1300 * take ownership of the current gesture at any point. 1301 * 1302 * <p>Using this function takes some care, as it has a fairly complicated 1303 * interaction with {@link View#onTouchEvent(MotionEvent) 1304 * View.onTouchEvent(MotionEvent)}, and using it requires implementing 1305 * that method as well as this one in the correct way. Events will be 1306 * received in the following order: 1307 * 1308 * <ol> 1309 * <li> You will receive the down event here. 1310 * <li> The down event will be handled either by a child of this view 1311 * group, or given to your own onTouchEvent() method to handle; this means 1312 * you should implement onTouchEvent() to return true, so you will 1313 * continue to see the rest of the gesture (instead of looking for 1314 * a parent view to handle it). Also, by returning true from 1315 * onTouchEvent(), you will not receive any following 1316 * events in onInterceptTouchEvent() and all touch processing must 1317 * happen in onTouchEvent() like normal. 1318 * <li> For as long as you return false from this function, each following 1319 * event (up to and including the final up) will be delivered first here 1320 * and then to the target's onTouchEvent(). 1321 * <li> If you return true from here, you will not receive any 1322 * following events: the target view will receive the same event but 1323 * with the action {@link MotionEvent#ACTION_CANCEL}, and all further 1324 * events will be delivered to your onTouchEvent() method and no longer 1325 * appear here. 1326 * </ol> 1327 * 1328 * @param ev The motion event being dispatched down the hierarchy. 1329 * @return Return true to steal motion events from the children and have 1330 * them dispatched to this ViewGroup through onTouchEvent(). 1331 * The current target will receive an ACTION_CANCEL event, and no further 1332 * messages will be delivered here. 1333 */ 1334 public boolean onInterceptTouchEvent(MotionEvent ev) { 1335 return false; 1336 } 1337 1338 /** 1339 * {@inheritDoc} 1340 * 1341 * Looks for a view to give focus to respecting the setting specified by 1342 * {@link #getDescendantFocusability()}. 1343 * 1344 * Uses {@link #onRequestFocusInDescendants(int, android.graphics.Rect)} to 1345 * find focus within the children of this group when appropriate. 1346 * 1347 * @see #FOCUS_BEFORE_DESCENDANTS 1348 * @see #FOCUS_AFTER_DESCENDANTS 1349 * @see #FOCUS_BLOCK_DESCENDANTS 1350 * @see #onRequestFocusInDescendants 1351 */ 1352 @Override 1353 public boolean requestFocus(int direction, Rect previouslyFocusedRect) { 1354 if (DBG) { 1355 System.out.println(this + " ViewGroup.requestFocus direction=" 1356 + direction); 1357 } 1358 int descendantFocusability = getDescendantFocusability(); 1359 1360 switch (descendantFocusability) { 1361 case FOCUS_BLOCK_DESCENDANTS: 1362 return super.requestFocus(direction, previouslyFocusedRect); 1363 case FOCUS_BEFORE_DESCENDANTS: { 1364 final boolean took = super.requestFocus(direction, previouslyFocusedRect); 1365 return took ? took : onRequestFocusInDescendants(direction, previouslyFocusedRect); 1366 } 1367 case FOCUS_AFTER_DESCENDANTS: { 1368 final boolean took = onRequestFocusInDescendants(direction, previouslyFocusedRect); 1369 return took ? took : super.requestFocus(direction, previouslyFocusedRect); 1370 } 1371 default: 1372 throw new IllegalStateException("descendant focusability must be " 1373 + "one of FOCUS_BEFORE_DESCENDANTS, FOCUS_AFTER_DESCENDANTS, FOCUS_BLOCK_DESCENDANTS " 1374 + "but is " + descendantFocusability); 1375 } 1376 } 1377 1378 /** 1379 * Look for a descendant to call {@link View#requestFocus} on. 1380 * Called by {@link ViewGroup#requestFocus(int, android.graphics.Rect)} 1381 * when it wants to request focus within its children. Override this to 1382 * customize how your {@link ViewGroup} requests focus within its children. 1383 * @param direction One of FOCUS_UP, FOCUS_DOWN, FOCUS_LEFT, and FOCUS_RIGHT 1384 * @param previouslyFocusedRect The rectangle (in this View's coordinate system) 1385 * to give a finer grained hint about where focus is coming from. May be null 1386 * if there is no hint. 1387 * @return Whether focus was taken. 1388 */ 1389 @SuppressWarnings({"ConstantConditions"}) 1390 protected boolean onRequestFocusInDescendants(int direction, 1391 Rect previouslyFocusedRect) { 1392 int index; 1393 int increment; 1394 int end; 1395 int count = mChildrenCount; 1396 if ((direction & FOCUS_FORWARD) != 0) { 1397 index = 0; 1398 increment = 1; 1399 end = count; 1400 } else { 1401 index = count - 1; 1402 increment = -1; 1403 end = -1; 1404 } 1405 final View[] children = mChildren; 1406 for (int i = index; i != end; i += increment) { 1407 View child = children[i]; 1408 if ((child.mViewFlags & VISIBILITY_MASK) == VISIBLE) { 1409 if (child.requestFocus(direction, previouslyFocusedRect)) { 1410 return true; 1411 } 1412 } 1413 } 1414 return false; 1415 } 1416 1417 /** 1418 * {@inheritDoc} 1419 * 1420 * @hide 1421 */ 1422 @Override 1423 public void dispatchStartTemporaryDetach() { 1424 super.dispatchStartTemporaryDetach(); 1425 final int count = mChildrenCount; 1426 final View[] children = mChildren; 1427 for (int i = 0; i < count; i++) { 1428 children[i].dispatchStartTemporaryDetach(); 1429 } 1430 } 1431 1432 /** 1433 * {@inheritDoc} 1434 * 1435 * @hide 1436 */ 1437 @Override 1438 public void dispatchFinishTemporaryDetach() { 1439 super.dispatchFinishTemporaryDetach(); 1440 final int count = mChildrenCount; 1441 final View[] children = mChildren; 1442 for (int i = 0; i < count; i++) { 1443 children[i].dispatchFinishTemporaryDetach(); 1444 } 1445 } 1446 1447 /** 1448 * {@inheritDoc} 1449 */ 1450 @Override 1451 void dispatchAttachedToWindow(AttachInfo info, int visibility) { 1452 super.dispatchAttachedToWindow(info, visibility); 1453 visibility |= mViewFlags & VISIBILITY_MASK; 1454 final int count = mChildrenCount; 1455 final View[] children = mChildren; 1456 for (int i = 0; i < count; i++) { 1457 children[i].dispatchAttachedToWindow(info, visibility); 1458 } 1459 } 1460 1461 @Override 1462 public boolean dispatchPopulateAccessibilityEvent(AccessibilityEvent event) { 1463 boolean populated = false; 1464 for (int i = 0, count = getChildCount(); i < count; i++) { 1465 populated |= getChildAt(i).dispatchPopulateAccessibilityEvent(event); 1466 } 1467 return populated; 1468 } 1469 1470 /** 1471 * {@inheritDoc} 1472 */ 1473 @Override 1474 void dispatchDetachedFromWindow() { 1475 // If we still have a motion target, we are still in the process of 1476 // dispatching motion events to a child; we need to get rid of that 1477 // child to avoid dispatching events to it after the window is torn 1478 // down. To make sure we keep the child in a consistent state, we 1479 // first send it an ACTION_CANCEL motion event. 1480 if (mMotionTarget != null) { 1481 final long now = SystemClock.uptimeMillis(); 1482 final MotionEvent event = MotionEvent.obtain(now, now, 1483 MotionEvent.ACTION_CANCEL, 0.0f, 0.0f, 0); 1484 mMotionTarget.dispatchTouchEvent(event); 1485 event.recycle(); 1486 mMotionTarget = null; 1487 } 1488 1489 final int count = mChildrenCount; 1490 final View[] children = mChildren; 1491 for (int i = 0; i < count; i++) { 1492 children[i].dispatchDetachedFromWindow(); 1493 } 1494 super.dispatchDetachedFromWindow(); 1495 } 1496 1497 /** 1498 * {@inheritDoc} 1499 */ 1500 @Override 1501 public void setPadding(int left, int top, int right, int bottom) { 1502 super.setPadding(left, top, right, bottom); 1503 1504 if ((mPaddingLeft | mPaddingTop | mPaddingRight | mPaddingRight) != 0) { 1505 mGroupFlags |= FLAG_PADDING_NOT_NULL; 1506 } else { 1507 mGroupFlags &= ~FLAG_PADDING_NOT_NULL; 1508 } 1509 } 1510 1511 /** 1512 * {@inheritDoc} 1513 */ 1514 @Override 1515 protected void dispatchSaveInstanceState(SparseArray<Parcelable> container) { 1516 super.dispatchSaveInstanceState(container); 1517 final int count = mChildrenCount; 1518 final View[] children = mChildren; 1519 for (int i = 0; i < count; i++) { 1520 View c = children[i]; 1521 if ((c.mViewFlags & PARENT_SAVE_DISABLED_MASK) != PARENT_SAVE_DISABLED) { 1522 c.dispatchSaveInstanceState(container); 1523 } 1524 } 1525 } 1526 1527 /** 1528 * Perform dispatching of a {@link #saveHierarchyState freeze()} to only this view, 1529 * not to its children. For use when overriding 1530 * {@link #dispatchSaveInstanceState dispatchFreeze()} to allow subclasses to freeze 1531 * their own state but not the state of their children. 1532 * 1533 * @param container the container 1534 */ 1535 protected void dispatchFreezeSelfOnly(SparseArray<Parcelable> container) { 1536 super.dispatchSaveInstanceState(container); 1537 } 1538 1539 /** 1540 * {@inheritDoc} 1541 */ 1542 @Override 1543 protected void dispatchRestoreInstanceState(SparseArray<Parcelable> container) { 1544 super.dispatchRestoreInstanceState(container); 1545 final int count = mChildrenCount; 1546 final View[] children = mChildren; 1547 for (int i = 0; i < count; i++) { 1548 View c = children[i]; 1549 if ((c.mViewFlags & PARENT_SAVE_DISABLED_MASK) != PARENT_SAVE_DISABLED) { 1550 c.dispatchRestoreInstanceState(container); 1551 } 1552 } 1553 } 1554 1555 /** 1556 * Perform dispatching of a {@link #restoreHierarchyState thaw()} to only this view, 1557 * not to its children. For use when overriding 1558 * {@link #dispatchRestoreInstanceState dispatchThaw()} to allow subclasses to thaw 1559 * their own state but not the state of their children. 1560 * 1561 * @param container the container 1562 */ 1563 protected void dispatchThawSelfOnly(SparseArray<Parcelable> container) { 1564 super.dispatchRestoreInstanceState(container); 1565 } 1566 1567 /** 1568 * Enables or disables the drawing cache for each child of this view group. 1569 * 1570 * @param enabled true to enable the cache, false to dispose of it 1571 */ 1572 protected void setChildrenDrawingCacheEnabled(boolean enabled) { 1573 if (enabled || (mPersistentDrawingCache & PERSISTENT_ALL_CACHES) != PERSISTENT_ALL_CACHES) { 1574 final View[] children = mChildren; 1575 final int count = mChildrenCount; 1576 for (int i = 0; i < count; i++) { 1577 children[i].setDrawingCacheEnabled(enabled); 1578 } 1579 } 1580 } 1581 1582 @Override 1583 protected void onAnimationStart() { 1584 super.onAnimationStart(); 1585 1586 // When this ViewGroup's animation starts, build the cache for the children 1587 if ((mGroupFlags & FLAG_ANIMATION_CACHE) == FLAG_ANIMATION_CACHE) { 1588 final int count = mChildrenCount; 1589 final View[] children = mChildren; 1590 1591 for (int i = 0; i < count; i++) { 1592 final View child = children[i]; 1593 if ((child.mViewFlags & VISIBILITY_MASK) == VISIBLE) { 1594 child.setDrawingCacheEnabled(true); 1595 child.buildDrawingCache(true); 1596 } 1597 } 1598 1599 mGroupFlags |= FLAG_CHILDREN_DRAWN_WITH_CACHE; 1600 } 1601 } 1602 1603 @Override 1604 protected void onAnimationEnd() { 1605 super.onAnimationEnd(); 1606 1607 // When this ViewGroup's animation ends, destroy the cache of the children 1608 if ((mGroupFlags & FLAG_ANIMATION_CACHE) == FLAG_ANIMATION_CACHE) { 1609 mGroupFlags &= ~FLAG_CHILDREN_DRAWN_WITH_CACHE; 1610 1611 if ((mPersistentDrawingCache & PERSISTENT_ANIMATION_CACHE) == 0) { 1612 setChildrenDrawingCacheEnabled(false); 1613 } 1614 } 1615 } 1616 1617 @Override 1618 Bitmap createSnapshot(Bitmap.Config quality, int backgroundColor, boolean skipChildren) { 1619 int count = mChildrenCount; 1620 int[] visibilities = null; 1621 1622 if (skipChildren) { 1623 visibilities = new int[count]; 1624 for (int i = 0; i < count; i++) { 1625 View child = getChildAt(i); 1626 visibilities[i] = child.getVisibility(); 1627 if (visibilities[i] == View.VISIBLE) { 1628 child.setVisibility(INVISIBLE); 1629 } 1630 } 1631 } 1632 1633 Bitmap b = super.createSnapshot(quality, backgroundColor, skipChildren); 1634 1635 if (skipChildren) { 1636 for (int i = 0; i < count; i++) { 1637 getChildAt(i).setVisibility(visibilities[i]); 1638 } 1639 } 1640 1641 return b; 1642 } 1643 1644 /** 1645 * {@inheritDoc} 1646 */ 1647 @Override 1648 protected void dispatchDraw(Canvas canvas) { 1649 final int count = mChildrenCount; 1650 final View[] children = mChildren; 1651 int flags = mGroupFlags; 1652 1653 if ((flags & FLAG_RUN_ANIMATION) != 0 && canAnimate()) { 1654 final boolean cache = (mGroupFlags & FLAG_ANIMATION_CACHE) == FLAG_ANIMATION_CACHE; 1655 1656 for (int i = 0; i < count; i++) { 1657 final View child = children[i]; 1658 if ((child.mViewFlags & VISIBILITY_MASK) == VISIBLE) { 1659 final LayoutParams params = child.getLayoutParams(); 1660 attachLayoutAnimationParameters(child, params, i, count); 1661 bindLayoutAnimation(child); 1662 if (cache) { 1663 child.setDrawingCacheEnabled(true); 1664 child.buildDrawingCache(true); 1665 } 1666 } 1667 } 1668 1669 final LayoutAnimationController controller = mLayoutAnimationController; 1670 if (controller.willOverlap()) { 1671 mGroupFlags |= FLAG_OPTIMIZE_INVALIDATE; 1672 } 1673 1674 controller.start(); 1675 1676 mGroupFlags &= ~FLAG_RUN_ANIMATION; 1677 mGroupFlags &= ~FLAG_ANIMATION_DONE; 1678 1679 if (cache) { 1680 mGroupFlags |= FLAG_CHILDREN_DRAWN_WITH_CACHE; 1681 } 1682 1683 if (mAnimationListener != null) { 1684 mAnimationListener.onAnimationStart(controller.getAnimation()); 1685 } 1686 } 1687 1688 int saveCount = 0; 1689 final boolean clipToPadding = (flags & CLIP_TO_PADDING_MASK) == CLIP_TO_PADDING_MASK; 1690 if (clipToPadding) { 1691 saveCount = canvas.save(); 1692 canvas.clipRect(mScrollX + mPaddingLeft, mScrollY + mPaddingTop, 1693 mScrollX + mRight - mLeft - mPaddingRight, 1694 mScrollY + mBottom - mTop - mPaddingBottom); 1695 1696 } 1697 1698 // We will draw our child's animation, let's reset the flag 1699 mPrivateFlags &= ~DRAW_ANIMATION; 1700 mGroupFlags &= ~FLAG_INVALIDATE_REQUIRED; 1701 1702 boolean more = false; 1703 final long drawingTime = getDrawingTime(); 1704 1705 if ((flags & FLAG_USE_CHILD_DRAWING_ORDER) == 0) { 1706 for (int i = 0; i < count; i++) { 1707 final View child = children[i]; 1708 if ((child.mViewFlags & VISIBILITY_MASK) == VISIBLE || child.getAnimation() != null) { 1709 more |= drawChild(canvas, child, drawingTime); 1710 } 1711 } 1712 } else { 1713 for (int i = 0; i < count; i++) { 1714 final View child = children[getChildDrawingOrder(count, i)]; 1715 if ((child.mViewFlags & VISIBILITY_MASK) == VISIBLE || child.getAnimation() != null) { 1716 more |= drawChild(canvas, child, drawingTime); 1717 } 1718 } 1719 } 1720 1721 // Draw any disappearing views that have animations 1722 if (mDisappearingChildren != null) { 1723 final ArrayList<View> disappearingChildren = mDisappearingChildren; 1724 final int disappearingCount = disappearingChildren.size() - 1; 1725 // Go backwards -- we may delete as animations finish 1726 for (int i = disappearingCount; i >= 0; i--) { 1727 final View child = disappearingChildren.get(i); 1728 more |= drawChild(canvas, child, drawingTime); 1729 } 1730 } 1731 1732 if (clipToPadding) { 1733 canvas.restoreToCount(saveCount); 1734 } 1735 1736 // mGroupFlags might have been updated by drawChild() 1737 flags = mGroupFlags; 1738 1739 if ((flags & FLAG_INVALIDATE_REQUIRED) == FLAG_INVALIDATE_REQUIRED) { 1740 invalidate(); 1741 } 1742 1743 if ((flags & FLAG_ANIMATION_DONE) == 0 && (flags & FLAG_NOTIFY_ANIMATION_LISTENER) == 0 && 1744 mLayoutAnimationController.isDone() && !more) { 1745 // We want to erase the drawing cache and notify the listener after the 1746 // next frame is drawn because one extra invalidate() is caused by 1747 // drawChild() after the animation is over 1748 mGroupFlags |= FLAG_NOTIFY_ANIMATION_LISTENER; 1749 final Runnable end = new Runnable() { 1750 public void run() { 1751 notifyAnimationListener(); 1752 } 1753 }; 1754 post(end); 1755 } 1756 } 1757 1758 /** 1759 * Returns the index of the child to draw for this iteration. Override this 1760 * if you want to change the drawing order of children. By default, it 1761 * returns i. 1762 * <p> 1763 * NOTE: In order for this method to be called, you must enable child ordering 1764 * first by calling {@link #setChildrenDrawingOrderEnabled(boolean)}. 1765 * 1766 * @param i The current iteration. 1767 * @return The index of the child to draw this iteration. 1768 * 1769 * @see #setChildrenDrawingOrderEnabled(boolean) 1770 * @see #isChildrenDrawingOrderEnabled() 1771 */ 1772 protected int getChildDrawingOrder(int childCount, int i) { 1773 return i; 1774 } 1775 1776 private void notifyAnimationListener() { 1777 mGroupFlags &= ~FLAG_NOTIFY_ANIMATION_LISTENER; 1778 mGroupFlags |= FLAG_ANIMATION_DONE; 1779 1780 if (mAnimationListener != null) { 1781 final Runnable end = new Runnable() { 1782 public void run() { 1783 mAnimationListener.onAnimationEnd(mLayoutAnimationController.getAnimation()); 1784 } 1785 }; 1786 post(end); 1787 } 1788 1789 if ((mGroupFlags & FLAG_ANIMATION_CACHE) == FLAG_ANIMATION_CACHE) { 1790 mGroupFlags &= ~FLAG_CHILDREN_DRAWN_WITH_CACHE; 1791 if ((mPersistentDrawingCache & PERSISTENT_ANIMATION_CACHE) == 0) { 1792 setChildrenDrawingCacheEnabled(false); 1793 } 1794 } 1795 1796 invalidate(); 1797 } 1798 1799 /** 1800 * Draw one child of this View Group. This method is responsible for getting 1801 * the canvas in the right state. This includes clipping, translating so 1802 * that the child's scrolled origin is at 0, 0, and applying any animation 1803 * transformations. 1804 * 1805 * @param canvas The canvas on which to draw the child 1806 * @param child Who to draw 1807 * @param drawingTime The time at which draw is occuring 1808 * @return True if an invalidate() was issued 1809 */ 1810 protected boolean drawChild(Canvas canvas, View child, long drawingTime) { 1811 boolean more = false; 1812 1813 final int cl = child.mLeft; 1814 final int ct = child.mTop; 1815 final int cr = child.mRight; 1816 final int cb = child.mBottom; 1817 1818 final int flags = mGroupFlags; 1819 1820 if ((flags & FLAG_CLEAR_TRANSFORMATION) == FLAG_CLEAR_TRANSFORMATION) { 1821 mChildTransformation.clear(); 1822 mGroupFlags &= ~FLAG_CLEAR_TRANSFORMATION; 1823 } 1824 1825 Transformation transformToApply = null; 1826 Transformation invalidationTransform; 1827 final Animation a = child.getAnimation(); 1828 boolean concatMatrix = false; 1829 1830 boolean scalingRequired = false; 1831 boolean caching = false; 1832 if (!canvas.isHardwareAccelerated() && 1833 (flags & FLAG_CHILDREN_DRAWN_WITH_CACHE) == FLAG_CHILDREN_DRAWN_WITH_CACHE || 1834 (flags & FLAG_ALWAYS_DRAWN_WITH_CACHE) == FLAG_ALWAYS_DRAWN_WITH_CACHE) { 1835 caching = true; 1836 if (mAttachInfo != null) scalingRequired = mAttachInfo.mScalingRequired; 1837 } 1838 1839 if (a != null) { 1840 final boolean initialized = a.isInitialized(); 1841 if (!initialized) { 1842 a.initialize(cr - cl, cb - ct, getWidth(), getHeight()); 1843 a.initializeInvalidateRegion(0, 0, cr - cl, cb - ct); 1844 child.onAnimationStart(); 1845 } 1846 1847 more = a.getTransformation(drawingTime, mChildTransformation, 1848 scalingRequired ? mAttachInfo.mApplicationScale : 1f); 1849 if (scalingRequired && mAttachInfo.mApplicationScale != 1f) { 1850 if (mInvalidationTransformation == null) { 1851 mInvalidationTransformation = new Transformation(); 1852 } 1853 invalidationTransform = mInvalidationTransformation; 1854 a.getTransformation(drawingTime, invalidationTransform, 1f); 1855 } else { 1856 invalidationTransform = mChildTransformation; 1857 } 1858 transformToApply = mChildTransformation; 1859 1860 concatMatrix = a.willChangeTransformationMatrix(); 1861 1862 if (more) { 1863 if (!a.willChangeBounds()) { 1864 if ((flags & (FLAG_OPTIMIZE_INVALIDATE | FLAG_ANIMATION_DONE)) == 1865 FLAG_OPTIMIZE_INVALIDATE) { 1866 mGroupFlags |= FLAG_INVALIDATE_REQUIRED; 1867 } else if ((flags & FLAG_INVALIDATE_REQUIRED) == 0) { 1868 // The child need to draw an animation, potentially offscreen, so 1869 // make sure we do not cancel invalidate requests 1870 mPrivateFlags |= DRAW_ANIMATION; 1871 invalidate(cl, ct, cr, cb); 1872 } 1873 } else { 1874 if (mInvalidateRegion == null) { 1875 mInvalidateRegion = new RectF(); 1876 } 1877 final RectF region = mInvalidateRegion; 1878 a.getInvalidateRegion(0, 0, cr - cl, cb - ct, region, invalidationTransform); 1879 1880 // The child need to draw an animation, potentially offscreen, so 1881 // make sure we do not cancel invalidate requests 1882 mPrivateFlags |= DRAW_ANIMATION; 1883 1884 final int left = cl + (int) region.left; 1885 final int top = ct + (int) region.top; 1886 invalidate(left, top, left + (int) region.width(), top + (int) region.height()); 1887 } 1888 } 1889 } else if ((flags & FLAG_SUPPORT_STATIC_TRANSFORMATIONS) == 1890 FLAG_SUPPORT_STATIC_TRANSFORMATIONS) { 1891 final boolean hasTransform = getChildStaticTransformation(child, mChildTransformation); 1892 if (hasTransform) { 1893 final int transformType = mChildTransformation.getTransformationType(); 1894 transformToApply = transformType != Transformation.TYPE_IDENTITY ? 1895 mChildTransformation : null; 1896 concatMatrix = (transformType & Transformation.TYPE_MATRIX) != 0; 1897 } 1898 } 1899 1900 concatMatrix |= !child.hasIdentityMatrix(); 1901 1902 // Sets the flag as early as possible to allow draw() implementations 1903 // to call invalidate() successfully when doing animations 1904 child.mPrivateFlags |= DRAWN; 1905 1906 if (!concatMatrix && canvas.quickReject(cl, ct, cr, cb, Canvas.EdgeType.BW) && 1907 (child.mPrivateFlags & DRAW_ANIMATION) == 0) { 1908 return more; 1909 } 1910 1911 child.computeScroll(); 1912 1913 final int sx = child.mScrollX; 1914 final int sy = child.mScrollY; 1915 1916 Bitmap cache = null; 1917 if (caching) { 1918 cache = child.getDrawingCache(true); 1919 } 1920 1921 final boolean hasNoCache = cache == null; 1922 1923 final int restoreTo = canvas.save(); 1924 if (hasNoCache) { 1925 canvas.translate(cl - sx, ct - sy); 1926 } else { 1927 canvas.translate(cl, ct); 1928 if (scalingRequired) { 1929 // mAttachInfo cannot be null, otherwise scalingRequired == false 1930 final float scale = 1.0f / mAttachInfo.mApplicationScale; 1931 canvas.scale(scale, scale); 1932 } 1933 } 1934 1935 float alpha = child.getAlpha(); 1936 1937 if (transformToApply != null || alpha < 1.0f || !child.hasIdentityMatrix()) { 1938 int transX = 0; 1939 int transY = 0; 1940 1941 if (hasNoCache) { 1942 transX = -sx; 1943 transY = -sy; 1944 } 1945 1946 if (transformToApply != null) { 1947 if (concatMatrix) { 1948 // Undo the scroll translation, apply the transformation matrix, 1949 // then redo the scroll translate to get the correct result. 1950 canvas.translate(-transX, -transY); 1951 canvas.concat(transformToApply.getMatrix()); 1952 canvas.translate(transX, transY); 1953 mGroupFlags |= FLAG_CLEAR_TRANSFORMATION; 1954 } 1955 1956 float transformAlpha = transformToApply.getAlpha(); 1957 if (transformAlpha < 1.0f) { 1958 alpha *= transformToApply.getAlpha(); 1959 mGroupFlags |= FLAG_CLEAR_TRANSFORMATION; 1960 } 1961 } 1962 1963 if (!child.hasIdentityMatrix()) { 1964 canvas.translate(-transX, -transY); 1965 canvas.concat(child.getMatrix()); 1966 canvas.translate(transX, transY); 1967 } 1968 1969 if (alpha < 1.0f) { 1970 mGroupFlags |= FLAG_CLEAR_TRANSFORMATION; 1971 1972 if (hasNoCache) { 1973 final int multipliedAlpha = (int) (255 * alpha); 1974 if (!child.onSetAlpha(multipliedAlpha)) { 1975 canvas.saveLayerAlpha(sx, sy, sx + cr - cl, sy + cb - ct, multipliedAlpha, 1976 Canvas.HAS_ALPHA_LAYER_SAVE_FLAG | Canvas.CLIP_TO_LAYER_SAVE_FLAG); 1977 } else { 1978 child.mPrivateFlags |= ALPHA_SET; 1979 } 1980 } 1981 } 1982 } else if ((child.mPrivateFlags & ALPHA_SET) == ALPHA_SET) { 1983 child.onSetAlpha(255); 1984 child.mPrivateFlags &= ~ALPHA_SET; 1985 } 1986 1987 if ((flags & FLAG_CLIP_CHILDREN) == FLAG_CLIP_CHILDREN) { 1988 if (hasNoCache) { 1989 canvas.clipRect(sx, sy, sx + (cr - cl), sy + (cb - ct)); 1990 } else { 1991 if (!scalingRequired) { 1992 canvas.clipRect(0, 0, cr - cl, cb - ct); 1993 } else { 1994 canvas.clipRect(0, 0, cache.getWidth(), cache.getHeight()); 1995 } 1996 } 1997 } 1998 1999 if (hasNoCache) { 2000 // Fast path for layouts with no backgrounds 2001 if ((child.mPrivateFlags & SKIP_DRAW) == SKIP_DRAW) { 2002 if (ViewDebug.TRACE_HIERARCHY) { 2003 ViewDebug.trace(this, ViewDebug.HierarchyTraceType.DRAW); 2004 } 2005 child.mPrivateFlags &= ~DIRTY_MASK; 2006 child.dispatchDraw(canvas); 2007 } else { 2008 child.draw(canvas); 2009 } 2010 } else { 2011 final Paint cachePaint = mCachePaint; 2012 if (alpha < 1.0f) { 2013 cachePaint.setAlpha((int) (alpha * 255)); 2014 mGroupFlags |= FLAG_ALPHA_LOWER_THAN_ONE; 2015 } else if ((flags & FLAG_ALPHA_LOWER_THAN_ONE) == FLAG_ALPHA_LOWER_THAN_ONE) { 2016 cachePaint.setAlpha(255); 2017 mGroupFlags &= ~FLAG_ALPHA_LOWER_THAN_ONE; 2018 } 2019 canvas.drawBitmap(cache, 0.0f, 0.0f, cachePaint); 2020 } 2021 2022 canvas.restoreToCount(restoreTo); 2023 2024 if (a != null && !more) { 2025 child.onSetAlpha(255); 2026 finishAnimatingView(child, a); 2027 } 2028 2029 return more; 2030 } 2031 2032 /** 2033 * By default, children are clipped to their bounds before drawing. This 2034 * allows view groups to override this behavior for animations, etc. 2035 * 2036 * @param clipChildren true to clip children to their bounds, 2037 * false otherwise 2038 * @attr ref android.R.styleable#ViewGroup_clipChildren 2039 */ 2040 public void setClipChildren(boolean clipChildren) { 2041 setBooleanFlag(FLAG_CLIP_CHILDREN, clipChildren); 2042 } 2043 2044 /** 2045 * By default, children are clipped to the padding of the ViewGroup. This 2046 * allows view groups to override this behavior 2047 * 2048 * @param clipToPadding true to clip children to the padding of the 2049 * group, false otherwise 2050 * @attr ref android.R.styleable#ViewGroup_clipToPadding 2051 */ 2052 public void setClipToPadding(boolean clipToPadding) { 2053 setBooleanFlag(FLAG_CLIP_TO_PADDING, clipToPadding); 2054 } 2055 2056 /** 2057 * {@inheritDoc} 2058 */ 2059 @Override 2060 public void dispatchSetSelected(boolean selected) { 2061 final View[] children = mChildren; 2062 final int count = mChildrenCount; 2063 for (int i = 0; i < count; i++) { 2064 2065 children[i].setSelected(selected); 2066 } 2067 } 2068 2069 @Override 2070 protected void dispatchSetPressed(boolean pressed) { 2071 final View[] children = mChildren; 2072 final int count = mChildrenCount; 2073 for (int i = 0; i < count; i++) { 2074 children[i].setPressed(pressed); 2075 } 2076 } 2077 2078 /** 2079 * When this property is set to true, this ViewGroup supports static transformations on 2080 * children; this causes 2081 * {@link #getChildStaticTransformation(View, android.view.animation.Transformation)} to be 2082 * invoked when a child is drawn. 2083 * 2084 * Any subclass overriding 2085 * {@link #getChildStaticTransformation(View, android.view.animation.Transformation)} should 2086 * set this property to true. 2087 * 2088 * @param enabled True to enable static transformations on children, false otherwise. 2089 * 2090 * @see #FLAG_SUPPORT_STATIC_TRANSFORMATIONS 2091 */ 2092 protected void setStaticTransformationsEnabled(boolean enabled) { 2093 setBooleanFlag(FLAG_SUPPORT_STATIC_TRANSFORMATIONS, enabled); 2094 } 2095 2096 /** 2097 * {@inheritDoc} 2098 * 2099 * @see #setStaticTransformationsEnabled(boolean) 2100 */ 2101 protected boolean getChildStaticTransformation(View child, Transformation t) { 2102 return false; 2103 } 2104 2105 /** 2106 * {@hide} 2107 */ 2108 @Override 2109 protected View findViewTraversal(int id) { 2110 if (id == mID) { 2111 return this; 2112 } 2113 2114 final View[] where = mChildren; 2115 final int len = mChildrenCount; 2116 2117 for (int i = 0; i < len; i++) { 2118 View v = where[i]; 2119 2120 if ((v.mPrivateFlags & IS_ROOT_NAMESPACE) == 0) { 2121 v = v.findViewById(id); 2122 2123 if (v != null) { 2124 return v; 2125 } 2126 } 2127 } 2128 2129 return null; 2130 } 2131 2132 /** 2133 * {@hide} 2134 */ 2135 @Override 2136 protected View findViewWithTagTraversal(Object tag) { 2137 if (tag != null && tag.equals(mTag)) { 2138 return this; 2139 } 2140 2141 final View[] where = mChildren; 2142 final int len = mChildrenCount; 2143 2144 for (int i = 0; i < len; i++) { 2145 View v = where[i]; 2146 2147 if ((v.mPrivateFlags & IS_ROOT_NAMESPACE) == 0) { 2148 v = v.findViewWithTag(tag); 2149 2150 if (v != null) { 2151 return v; 2152 } 2153 } 2154 } 2155 2156 return null; 2157 } 2158 2159 /** 2160 * Adds a child view. If no layout parameters are already set on the child, the 2161 * default parameters for this ViewGroup are set on the child. 2162 * 2163 * @param child the child view to add 2164 * 2165 * @see #generateDefaultLayoutParams() 2166 */ 2167 public void addView(View child) { 2168 addView(child, -1); 2169 } 2170 2171 /** 2172 * Adds a child view. If no layout parameters are already set on the child, the 2173 * default parameters for this ViewGroup are set on the child. 2174 * 2175 * @param child the child view to add 2176 * @param index the position at which to add the child 2177 * 2178 * @see #generateDefaultLayoutParams() 2179 */ 2180 public void addView(View child, int index) { 2181 LayoutParams params = child.getLayoutParams(); 2182 if (params == null) { 2183 params = generateDefaultLayoutParams(); 2184 if (params == null) { 2185 throw new IllegalArgumentException("generateDefaultLayoutParams() cannot return null"); 2186 } 2187 } 2188 addView(child, index, params); 2189 } 2190 2191 /** 2192 * Adds a child view with this ViewGroup's default layout parameters and the 2193 * specified width and height. 2194 * 2195 * @param child the child view to add 2196 */ 2197 public void addView(View child, int width, int height) { 2198 final LayoutParams params = generateDefaultLayoutParams(); 2199 params.width = width; 2200 params.height = height; 2201 addView(child, -1, params); 2202 } 2203 2204 /** 2205 * Adds a child view with the specified layout parameters. 2206 * 2207 * @param child the child view to add 2208 * @param params the layout parameters to set on the child 2209 */ 2210 public void addView(View child, LayoutParams params) { 2211 addView(child, -1, params); 2212 } 2213 2214 /** 2215 * Adds a child view with the specified layout parameters. 2216 * 2217 * @param child the child view to add 2218 * @param index the position at which to add the child 2219 * @param params the layout parameters to set on the child 2220 */ 2221 public void addView(View child, int index, LayoutParams params) { 2222 if (DBG) { 2223 System.out.println(this + " addView"); 2224 } 2225 2226 // addViewInner() will call child.requestLayout() when setting the new LayoutParams 2227 // therefore, we call requestLayout() on ourselves before, so that the child's request 2228 // will be blocked at our level 2229 requestLayout(); 2230 invalidate(); 2231 addViewInner(child, index, params, false); 2232 } 2233 2234 /** 2235 * {@inheritDoc} 2236 */ 2237 public void updateViewLayout(View view, ViewGroup.LayoutParams params) { 2238 if (!checkLayoutParams(params)) { 2239 throw new IllegalArgumentException("Invalid LayoutParams supplied to " + this); 2240 } 2241 if (view.mParent != this) { 2242 throw new IllegalArgumentException("Given view not a child of " + this); 2243 } 2244 view.setLayoutParams(params); 2245 } 2246 2247 /** 2248 * {@inheritDoc} 2249 */ 2250 protected boolean checkLayoutParams(ViewGroup.LayoutParams p) { 2251 return p != null; 2252 } 2253 2254 /** 2255 * Interface definition for a callback to be invoked when the hierarchy 2256 * within this view changed. The hierarchy changes whenever a child is added 2257 * to or removed from this view. 2258 */ 2259 public interface OnHierarchyChangeListener { 2260 /** 2261 * Called when a new child is added to a parent view. 2262 * 2263 * @param parent the view in which a child was added 2264 * @param child the new child view added in the hierarchy 2265 */ 2266 void onChildViewAdded(View parent, View child); 2267 2268 /** 2269 * Called when a child is removed from a parent view. 2270 * 2271 * @param parent the view from which the child was removed 2272 * @param child the child removed from the hierarchy 2273 */ 2274 void onChildViewRemoved(View parent, View child); 2275 } 2276 2277 /** 2278 * Register a callback to be invoked when a child is added to or removed 2279 * from this view. 2280 * 2281 * @param listener the callback to invoke on hierarchy change 2282 */ 2283 public void setOnHierarchyChangeListener(OnHierarchyChangeListener listener) { 2284 mOnHierarchyChangeListener = listener; 2285 } 2286 2287 /** 2288 * Adds a view during layout. This is useful if in your onLayout() method, 2289 * you need to add more views (as does the list view for example). 2290 * 2291 * If index is negative, it means put it at the end of the list. 2292 * 2293 * @param child the view to add to the group 2294 * @param index the index at which the child must be added 2295 * @param params the layout parameters to associate with the child 2296 * @return true if the child was added, false otherwise 2297 */ 2298 protected boolean addViewInLayout(View child, int index, LayoutParams params) { 2299 return addViewInLayout(child, index, params, false); 2300 } 2301 2302 /** 2303 * Adds a view during layout. This is useful if in your onLayout() method, 2304 * you need to add more views (as does the list view for example). 2305 * 2306 * If index is negative, it means put it at the end of the list. 2307 * 2308 * @param child the view to add to the group 2309 * @param index the index at which the child must be added 2310 * @param params the layout parameters to associate with the child 2311 * @param preventRequestLayout if true, calling this method will not trigger a 2312 * layout request on child 2313 * @return true if the child was added, false otherwise 2314 */ 2315 protected boolean addViewInLayout(View child, int index, LayoutParams params, 2316 boolean preventRequestLayout) { 2317 child.mParent = null; 2318 addViewInner(child, index, params, preventRequestLayout); 2319 child.mPrivateFlags = (child.mPrivateFlags & ~DIRTY_MASK) | DRAWN; 2320 return true; 2321 } 2322 2323 /** 2324 * Prevents the specified child to be laid out during the next layout pass. 2325 * 2326 * @param child the child on which to perform the cleanup 2327 */ 2328 protected void cleanupLayoutState(View child) { 2329 child.mPrivateFlags &= ~View.FORCE_LAYOUT; 2330 } 2331 2332 private void addViewInner(View child, int index, LayoutParams params, 2333 boolean preventRequestLayout) { 2334 2335 if (child.getParent() != null) { 2336 throw new IllegalStateException("The specified child already has a parent. " + 2337 "You must call removeView() on the child's parent first."); 2338 } 2339 2340 if (mTransition != null) { 2341 mTransition.childAdd(this, child); 2342 } 2343 2344 if (!checkLayoutParams(params)) { 2345 params = generateLayoutParams(params); 2346 } 2347 2348 if (preventRequestLayout) { 2349 child.mLayoutParams = params; 2350 } else { 2351 child.setLayoutParams(params); 2352 } 2353 2354 if (index < 0) { 2355 index = mChildrenCount; 2356 } 2357 2358 addInArray(child, index); 2359 2360 // tell our children 2361 if (preventRequestLayout) { 2362 child.assignParent(this); 2363 } else { 2364 child.mParent = this; 2365 } 2366 2367 if (child.hasFocus()) { 2368 requestChildFocus(child, child.findFocus()); 2369 } 2370 2371 AttachInfo ai = mAttachInfo; 2372 if (ai != null) { 2373 boolean lastKeepOn = ai.mKeepScreenOn; 2374 ai.mKeepScreenOn = false; 2375 child.dispatchAttachedToWindow(mAttachInfo, (mViewFlags&VISIBILITY_MASK)); 2376 if (ai.mKeepScreenOn) { 2377 needGlobalAttributesUpdate(true); 2378 } 2379 ai.mKeepScreenOn = lastKeepOn; 2380 } 2381 2382 if (mOnHierarchyChangeListener != null) { 2383 mOnHierarchyChangeListener.onChildViewAdded(this, child); 2384 } 2385 2386 if ((child.mViewFlags & DUPLICATE_PARENT_STATE) == DUPLICATE_PARENT_STATE) { 2387 mGroupFlags |= FLAG_NOTIFY_CHILDREN_ON_DRAWABLE_STATE_CHANGE; 2388 } 2389 } 2390 2391 private void addInArray(View child, int index) { 2392 View[] children = mChildren; 2393 final int count = mChildrenCount; 2394 final int size = children.length; 2395 if (index == count) { 2396 if (size == count) { 2397 mChildren = new View[size + ARRAY_CAPACITY_INCREMENT]; 2398 System.arraycopy(children, 0, mChildren, 0, size); 2399 children = mChildren; 2400 } 2401 children[mChildrenCount++] = child; 2402 } else if (index < count) { 2403 if (size == count) { 2404 mChildren = new View[size + ARRAY_CAPACITY_INCREMENT]; 2405 System.arraycopy(children, 0, mChildren, 0, index); 2406 System.arraycopy(children, index, mChildren, index + 1, count - index); 2407 children = mChildren; 2408 } else { 2409 System.arraycopy(children, index, children, index + 1, count - index); 2410 } 2411 children[index] = child; 2412 mChildrenCount++; 2413 } else { 2414 throw new IndexOutOfBoundsException("index=" + index + " count=" + count); 2415 } 2416 } 2417 2418 // This method also sets the child's mParent to null 2419 private void removeFromArray(int index) { 2420 final View[] children = mChildren; 2421 if (!(mTransitioningViews != null && mTransitioningViews.contains(children[index]))) { 2422 children[index].mParent = null; 2423 } 2424 final int count = mChildrenCount; 2425 if (index == count - 1) { 2426 children[--mChildrenCount] = null; 2427 } else if (index >= 0 && index < count) { 2428 System.arraycopy(children, index + 1, children, index, count - index - 1); 2429 children[--mChildrenCount] = null; 2430 } else { 2431 throw new IndexOutOfBoundsException(); 2432 } 2433 } 2434 2435 // This method also sets the children's mParent to null 2436 private void removeFromArray(int start, int count) { 2437 final View[] children = mChildren; 2438 final int childrenCount = mChildrenCount; 2439 2440 start = Math.max(0, start); 2441 final int end = Math.min(childrenCount, start + count); 2442 2443 if (start == end) { 2444 return; 2445 } 2446 2447 if (end == childrenCount) { 2448 for (int i = start; i < end; i++) { 2449 children[i].mParent = null; 2450 children[i] = null; 2451 } 2452 } else { 2453 for (int i = start; i < end; i++) { 2454 children[i].mParent = null; 2455 } 2456 2457 // Since we're looping above, we might as well do the copy, but is arraycopy() 2458 // faster than the extra 2 bounds checks we would do in the loop? 2459 System.arraycopy(children, end, children, start, childrenCount - end); 2460 2461 for (int i = childrenCount - (end - start); i < childrenCount; i++) { 2462 children[i] = null; 2463 } 2464 } 2465 2466 mChildrenCount -= (end - start); 2467 } 2468 2469 private void bindLayoutAnimation(View child) { 2470 Animation a = mLayoutAnimationController.getAnimationForView(child); 2471 child.setAnimation(a); 2472 } 2473 2474 /** 2475 * Subclasses should override this method to set layout animation 2476 * parameters on the supplied child. 2477 * 2478 * @param child the child to associate with animation parameters 2479 * @param params the child's layout parameters which hold the animation 2480 * parameters 2481 * @param index the index of the child in the view group 2482 * @param count the number of children in the view group 2483 */ 2484 protected void attachLayoutAnimationParameters(View child, 2485 LayoutParams params, int index, int count) { 2486 LayoutAnimationController.AnimationParameters animationParams = 2487 params.layoutAnimationParameters; 2488 if (animationParams == null) { 2489 animationParams = new LayoutAnimationController.AnimationParameters(); 2490 params.layoutAnimationParameters = animationParams; 2491 } 2492 2493 animationParams.count = count; 2494 animationParams.index = index; 2495 } 2496 2497 /** 2498 * {@inheritDoc} 2499 */ 2500 public void removeView(View view) { 2501 removeViewInternal(view); 2502 requestLayout(); 2503 invalidate(); 2504 } 2505 2506 /** 2507 * Removes a view during layout. This is useful if in your onLayout() method, 2508 * you need to remove more views. 2509 * 2510 * @param view the view to remove from the group 2511 */ 2512 public void removeViewInLayout(View view) { 2513 removeViewInternal(view); 2514 } 2515 2516 /** 2517 * Removes a range of views during layout. This is useful if in your onLayout() method, 2518 * you need to remove more views. 2519 * 2520 * @param start the index of the first view to remove from the group 2521 * @param count the number of views to remove from the group 2522 */ 2523 public void removeViewsInLayout(int start, int count) { 2524 removeViewsInternal(start, count); 2525 } 2526 2527 /** 2528 * Removes the view at the specified position in the group. 2529 * 2530 * @param index the position in the group of the view to remove 2531 */ 2532 public void removeViewAt(int index) { 2533 removeViewInternal(index, getChildAt(index)); 2534 requestLayout(); 2535 invalidate(); 2536 } 2537 2538 /** 2539 * Removes the specified range of views from the group. 2540 * 2541 * @param start the first position in the group of the range of views to remove 2542 * @param count the number of views to remove 2543 */ 2544 public void removeViews(int start, int count) { 2545 removeViewsInternal(start, count); 2546 requestLayout(); 2547 invalidate(); 2548 } 2549 2550 private void removeViewInternal(View view) { 2551 final int index = indexOfChild(view); 2552 if (index >= 0) { 2553 removeViewInternal(index, view); 2554 } 2555 } 2556 2557 private void removeViewInternal(int index, View view) { 2558 2559 if (mTransition != null) { 2560 mTransition.childRemove(this, view); 2561 } 2562 2563 boolean clearChildFocus = false; 2564 if (view == mFocused) { 2565 view.clearFocusForRemoval(); 2566 clearChildFocus = true; 2567 } 2568 2569 if (view.getAnimation() != null || 2570 (mTransitioningViews != null && mTransitioningViews.contains(view))) { 2571 addDisappearingView(view); 2572 } else if (view.mAttachInfo != null) { 2573 view.dispatchDetachedFromWindow(); 2574 } 2575 2576 if (mOnHierarchyChangeListener != null) { 2577 mOnHierarchyChangeListener.onChildViewRemoved(this, view); 2578 } 2579 2580 needGlobalAttributesUpdate(false); 2581 2582 removeFromArray(index); 2583 2584 if (clearChildFocus) { 2585 clearChildFocus(view); 2586 } 2587 } 2588 2589 /** 2590 * Sets the LayoutTransition object for this ViewGroup. If the LayoutTransition object is 2591 * not null, changes in layout which occur because of children being added to or removed from 2592 * the ViewGroup will be animated according to the animations defined in that LayoutTransition 2593 * object. By default, the transition object is null (so layout changes are not animated). 2594 * 2595 * @param transition The LayoutTransition object that will animated changes in layout. A value 2596 * of <code>null</code> means no transition will run on layout changes. 2597 * @attr ref android.R.styleable#ViewGroup_animateLayoutChanges 2598 */ 2599 public void setLayoutTransition(LayoutTransition transition) { 2600 if (mTransition != null) { 2601 mTransition.removeTransitionListener(mLayoutTransitionListener); 2602 } 2603 mTransition = transition; 2604 if (mTransition != null) { 2605 mTransition.addTransitionListener(mLayoutTransitionListener); 2606 } 2607 } 2608 2609 /** 2610 * Gets the LayoutTransition object for this ViewGroup. If the LayoutTransition object is 2611 * not null, changes in layout which occur because of children being added to or removed from 2612 * the ViewGroup will be animated according to the animations defined in that LayoutTransition 2613 * object. By default, the transition object is null (so layout changes are not animated). 2614 * 2615 * @return LayoutTranstion The LayoutTransition object that will animated changes in layout. 2616 * A value of <code>null</code> means no transition will run on layout changes. 2617 */ 2618 public LayoutTransition getLayoutTransition() { 2619 return mTransition; 2620 } 2621 2622 private void removeViewsInternal(int start, int count) { 2623 final OnHierarchyChangeListener onHierarchyChangeListener = mOnHierarchyChangeListener; 2624 final boolean notifyListener = onHierarchyChangeListener != null; 2625 final View focused = mFocused; 2626 final boolean detach = mAttachInfo != null; 2627 View clearChildFocus = null; 2628 2629 final View[] children = mChildren; 2630 final int end = start + count; 2631 2632 for (int i = start; i < end; i++) { 2633 final View view = children[i]; 2634 2635 if (mTransition != null) { 2636 mTransition.childRemove(this, view); 2637 } 2638 2639 if (view == focused) { 2640 view.clearFocusForRemoval(); 2641 clearChildFocus = view; 2642 } 2643 2644 if (view.getAnimation() != null || 2645 (mTransitioningViews != null && mTransitioningViews.contains(view))) { 2646 addDisappearingView(view); 2647 } else if (detach) { 2648 view.dispatchDetachedFromWindow(); 2649 } 2650 2651 needGlobalAttributesUpdate(false); 2652 2653 if (notifyListener) { 2654 onHierarchyChangeListener.onChildViewRemoved(this, view); 2655 } 2656 } 2657 2658 removeFromArray(start, count); 2659 2660 if (clearChildFocus != null) { 2661 clearChildFocus(clearChildFocus); 2662 } 2663 } 2664 2665 /** 2666 * Call this method to remove all child views from the 2667 * ViewGroup. 2668 */ 2669 public void removeAllViews() { 2670 removeAllViewsInLayout(); 2671 requestLayout(); 2672 invalidate(); 2673 } 2674 2675 /** 2676 * Called by a ViewGroup subclass to remove child views from itself, 2677 * when it must first know its size on screen before it can calculate how many 2678 * child views it will render. An example is a Gallery or a ListView, which 2679 * may "have" 50 children, but actually only render the number of children 2680 * that can currently fit inside the object on screen. Do not call 2681 * this method unless you are extending ViewGroup and understand the 2682 * view measuring and layout pipeline. 2683 */ 2684 public void removeAllViewsInLayout() { 2685 final int count = mChildrenCount; 2686 if (count <= 0) { 2687 return; 2688 } 2689 2690 final View[] children = mChildren; 2691 mChildrenCount = 0; 2692 2693 final OnHierarchyChangeListener listener = mOnHierarchyChangeListener; 2694 final boolean notify = listener != null; 2695 final View focused = mFocused; 2696 final boolean detach = mAttachInfo != null; 2697 View clearChildFocus = null; 2698 2699 needGlobalAttributesUpdate(false); 2700 2701 for (int i = count - 1; i >= 0; i--) { 2702 final View view = children[i]; 2703 2704 if (mTransition != null) { 2705 mTransition.childRemove(this, view); 2706 } 2707 2708 if (view == focused) { 2709 view.clearFocusForRemoval(); 2710 clearChildFocus = view; 2711 } 2712 2713 if (view.getAnimation() != null || 2714 (mTransitioningViews != null && mTransitioningViews.contains(view))) { 2715 addDisappearingView(view); 2716 } else if (detach) { 2717 view.dispatchDetachedFromWindow(); 2718 } 2719 2720 if (notify) { 2721 listener.onChildViewRemoved(this, view); 2722 } 2723 2724 view.mParent = null; 2725 children[i] = null; 2726 } 2727 2728 if (clearChildFocus != null) { 2729 clearChildFocus(clearChildFocus); 2730 } 2731 } 2732 2733 /** 2734 * Finishes the removal of a detached view. This method will dispatch the detached from 2735 * window event and notify the hierarchy change listener. 2736 * 2737 * @param child the child to be definitely removed from the view hierarchy 2738 * @param animate if true and the view has an animation, the view is placed in the 2739 * disappearing views list, otherwise, it is detached from the window 2740 * 2741 * @see #attachViewToParent(View, int, android.view.ViewGroup.LayoutParams) 2742 * @see #detachAllViewsFromParent() 2743 * @see #detachViewFromParent(View) 2744 * @see #detachViewFromParent(int) 2745 */ 2746 protected void removeDetachedView(View child, boolean animate) { 2747 if (mTransition != null) { 2748 mTransition.childRemove(this, child); 2749 } 2750 2751 if (child == mFocused) { 2752 child.clearFocus(); 2753 } 2754 2755 if ((animate && child.getAnimation() != null) || 2756 (mTransitioningViews != null && mTransitioningViews.contains(child))) { 2757 addDisappearingView(child); 2758 } else if (child.mAttachInfo != null) { 2759 child.dispatchDetachedFromWindow(); 2760 } 2761 2762 if (mOnHierarchyChangeListener != null) { 2763 mOnHierarchyChangeListener.onChildViewRemoved(this, child); 2764 } 2765 } 2766 2767 /** 2768 * Attaches a view to this view group. Attaching a view assigns this group as the parent, 2769 * sets the layout parameters and puts the view in the list of children so it can be retrieved 2770 * by calling {@link #getChildAt(int)}. 2771 * 2772 * This method should be called only for view which were detached from their parent. 2773 * 2774 * @param child the child to attach 2775 * @param index the index at which the child should be attached 2776 * @param params the layout parameters of the child 2777 * 2778 * @see #removeDetachedView(View, boolean) 2779 * @see #detachAllViewsFromParent() 2780 * @see #detachViewFromParent(View) 2781 * @see #detachViewFromParent(int) 2782 */ 2783 protected void attachViewToParent(View child, int index, LayoutParams params) { 2784 child.mLayoutParams = params; 2785 2786 if (index < 0) { 2787 index = mChildrenCount; 2788 } 2789 2790 addInArray(child, index); 2791 2792 child.mParent = this; 2793 child.mPrivateFlags = (child.mPrivateFlags & ~DIRTY_MASK & ~DRAWING_CACHE_VALID) | DRAWN; 2794 2795 if (child.hasFocus()) { 2796 requestChildFocus(child, child.findFocus()); 2797 } 2798 } 2799 2800 /** 2801 * Detaches a view from its parent. Detaching a view should be temporary and followed 2802 * either by a call to {@link #attachViewToParent(View, int, android.view.ViewGroup.LayoutParams)} 2803 * or a call to {@link #removeDetachedView(View, boolean)}. When a view is detached, 2804 * its parent is null and cannot be retrieved by a call to {@link #getChildAt(int)}. 2805 * 2806 * @param child the child to detach 2807 * 2808 * @see #detachViewFromParent(int) 2809 * @see #detachViewsFromParent(int, int) 2810 * @see #detachAllViewsFromParent() 2811 * @see #attachViewToParent(View, int, android.view.ViewGroup.LayoutParams) 2812 * @see #removeDetachedView(View, boolean) 2813 */ 2814 protected void detachViewFromParent(View child) { 2815 removeFromArray(indexOfChild(child)); 2816 } 2817 2818 /** 2819 * Detaches a view from its parent. Detaching a view should be temporary and followed 2820 * either by a call to {@link #attachViewToParent(View, int, android.view.ViewGroup.LayoutParams)} 2821 * or a call to {@link #removeDetachedView(View, boolean)}. When a view is detached, 2822 * its parent is null and cannot be retrieved by a call to {@link #getChildAt(int)}. 2823 * 2824 * @param index the index of the child to detach 2825 * 2826 * @see #detachViewFromParent(View) 2827 * @see #detachAllViewsFromParent() 2828 * @see #detachViewsFromParent(int, int) 2829 * @see #attachViewToParent(View, int, android.view.ViewGroup.LayoutParams) 2830 * @see #removeDetachedView(View, boolean) 2831 */ 2832 protected void detachViewFromParent(int index) { 2833 removeFromArray(index); 2834 } 2835 2836 /** 2837 * Detaches a range of view from their parent. Detaching a view should be temporary and followed 2838 * either by a call to {@link #attachViewToParent(View, int, android.view.ViewGroup.LayoutParams)} 2839 * or a call to {@link #removeDetachedView(View, boolean)}. When a view is detached, its 2840 * parent is null and cannot be retrieved by a call to {@link #getChildAt(int)}. 2841 * 2842 * @param start the first index of the childrend range to detach 2843 * @param count the number of children to detach 2844 * 2845 * @see #detachViewFromParent(View) 2846 * @see #detachViewFromParent(int) 2847 * @see #detachAllViewsFromParent() 2848 * @see #attachViewToParent(View, int, android.view.ViewGroup.LayoutParams) 2849 * @see #removeDetachedView(View, boolean) 2850 */ 2851 protected void detachViewsFromParent(int start, int count) { 2852 removeFromArray(start, count); 2853 } 2854 2855 /** 2856 * Detaches all views from the parent. Detaching a view should be temporary and followed 2857 * either by a call to {@link #attachViewToParent(View, int, android.view.ViewGroup.LayoutParams)} 2858 * or a call to {@link #removeDetachedView(View, boolean)}. When a view is detached, 2859 * its parent is null and cannot be retrieved by a call to {@link #getChildAt(int)}. 2860 * 2861 * @see #detachViewFromParent(View) 2862 * @see #detachViewFromParent(int) 2863 * @see #detachViewsFromParent(int, int) 2864 * @see #attachViewToParent(View, int, android.view.ViewGroup.LayoutParams) 2865 * @see #removeDetachedView(View, boolean) 2866 */ 2867 protected void detachAllViewsFromParent() { 2868 final int count = mChildrenCount; 2869 if (count <= 0) { 2870 return; 2871 } 2872 2873 final View[] children = mChildren; 2874 mChildrenCount = 0; 2875 2876 for (int i = count - 1; i >= 0; i--) { 2877 children[i].mParent = null; 2878 children[i] = null; 2879 } 2880 } 2881 2882 /** 2883 * Don't call or override this method. It is used for the implementation of 2884 * the view hierarchy. 2885 */ 2886 public final void invalidateChild(View child, final Rect dirty) { 2887 if (ViewDebug.TRACE_HIERARCHY) { 2888 ViewDebug.trace(this, ViewDebug.HierarchyTraceType.INVALIDATE_CHILD); 2889 } 2890 2891 ViewParent parent = this; 2892 2893 final AttachInfo attachInfo = mAttachInfo; 2894 if (attachInfo != null) { 2895 final int[] location = attachInfo.mInvalidateChildLocation; 2896 location[CHILD_LEFT_INDEX] = child.mLeft; 2897 location[CHILD_TOP_INDEX] = child.mTop; 2898 Matrix childMatrix = child.getMatrix(); 2899 if (!childMatrix.isIdentity()) { 2900 RectF boundingRect = attachInfo.mTmpTransformRect; 2901 boundingRect.set(dirty); 2902 childMatrix.mapRect(boundingRect); 2903 dirty.set((int) boundingRect.left, (int) boundingRect.top, 2904 (int) (boundingRect.right + 0.5f), 2905 (int) (boundingRect.bottom + 0.5f)); 2906 } 2907 2908 // If the child is drawing an animation, we want to copy this flag onto 2909 // ourselves and the parent to make sure the invalidate request goes 2910 // through 2911 final boolean drawAnimation = (child.mPrivateFlags & DRAW_ANIMATION) == DRAW_ANIMATION; 2912 2913 // Check whether the child that requests the invalidate is fully opaque 2914 final boolean isOpaque = child.isOpaque() && !drawAnimation && 2915 child.getAnimation() != null; 2916 // Mark the child as dirty, using the appropriate flag 2917 // Make sure we do not set both flags at the same time 2918 final int opaqueFlag = isOpaque ? DIRTY_OPAQUE : DIRTY; 2919 2920 do { 2921 View view = null; 2922 if (parent instanceof View) { 2923 view = (View) parent; 2924 } 2925 2926 if (drawAnimation) { 2927 if (view != null) { 2928 view.mPrivateFlags |= DRAW_ANIMATION; 2929 } else if (parent instanceof ViewRoot) { 2930 ((ViewRoot) parent).mIsAnimating = true; 2931 } 2932 } 2933 2934 // If the parent is dirty opaque or not dirty, mark it dirty with the opaque 2935 // flag coming from the child that initiated the invalidate 2936 if (view != null && (view.mPrivateFlags & DIRTY_MASK) != DIRTY) { 2937 view.mPrivateFlags = (view.mPrivateFlags & ~DIRTY_MASK) | opaqueFlag; 2938 } 2939 2940 parent = parent.invalidateChildInParent(location, dirty); 2941 if (view != null) { 2942 // Account for transform on current parent 2943 Matrix m = view.getMatrix(); 2944 if (!m.isIdentity()) { 2945 RectF boundingRect = attachInfo.mTmpTransformRect; 2946 boundingRect.set(dirty); 2947 m.mapRect(boundingRect); 2948 dirty.set((int) boundingRect.left, (int) boundingRect.top, 2949 (int) (boundingRect.right + 0.5f), 2950 (int) (boundingRect.bottom + 0.5f)); 2951 } 2952 } 2953 } while (parent != null); 2954 } 2955 } 2956 2957 /** 2958 * Don't call or override this method. It is used for the implementation of 2959 * the view hierarchy. 2960 * 2961 * This implementation returns null if this ViewGroup does not have a parent, 2962 * if this ViewGroup is already fully invalidated or if the dirty rectangle 2963 * does not intersect with this ViewGroup's bounds. 2964 */ 2965 public ViewParent invalidateChildInParent(final int[] location, final Rect dirty) { 2966 if (ViewDebug.TRACE_HIERARCHY) { 2967 ViewDebug.trace(this, ViewDebug.HierarchyTraceType.INVALIDATE_CHILD_IN_PARENT); 2968 } 2969 2970 if ((mPrivateFlags & DRAWN) == DRAWN) { 2971 if ((mGroupFlags & (FLAG_OPTIMIZE_INVALIDATE | FLAG_ANIMATION_DONE)) != 2972 FLAG_OPTIMIZE_INVALIDATE) { 2973 dirty.offset(location[CHILD_LEFT_INDEX] - mScrollX, 2974 location[CHILD_TOP_INDEX] - mScrollY); 2975 2976 final int left = mLeft; 2977 final int top = mTop; 2978 2979 if (dirty.intersect(0, 0, mRight - left, mBottom - top) || 2980 (mPrivateFlags & DRAW_ANIMATION) == DRAW_ANIMATION) { 2981 mPrivateFlags &= ~DRAWING_CACHE_VALID; 2982 2983 location[CHILD_LEFT_INDEX] = left; 2984 location[CHILD_TOP_INDEX] = top; 2985 2986 return mParent; 2987 } 2988 } else { 2989 mPrivateFlags &= ~DRAWN & ~DRAWING_CACHE_VALID; 2990 2991 location[CHILD_LEFT_INDEX] = mLeft; 2992 location[CHILD_TOP_INDEX] = mTop; 2993 2994 dirty.set(0, 0, mRight - location[CHILD_LEFT_INDEX], 2995 mBottom - location[CHILD_TOP_INDEX]); 2996 2997 return mParent; 2998 } 2999 } 3000 3001 return null; 3002 } 3003 3004 /** 3005 * Offset a rectangle that is in a descendant's coordinate 3006 * space into our coordinate space. 3007 * @param descendant A descendant of this view 3008 * @param rect A rectangle defined in descendant's coordinate space. 3009 */ 3010 public final void offsetDescendantRectToMyCoords(View descendant, Rect rect) { 3011 offsetRectBetweenParentAndChild(descendant, rect, true, false); 3012 } 3013 3014 /** 3015 * Offset a rectangle that is in our coordinate space into an ancestor's 3016 * coordinate space. 3017 * @param descendant A descendant of this view 3018 * @param rect A rectangle defined in descendant's coordinate space. 3019 */ 3020 public final void offsetRectIntoDescendantCoords(View descendant, Rect rect) { 3021 offsetRectBetweenParentAndChild(descendant, rect, false, false); 3022 } 3023 3024 /** 3025 * Helper method that offsets a rect either from parent to descendant or 3026 * descendant to parent. 3027 */ 3028 void offsetRectBetweenParentAndChild(View descendant, Rect rect, 3029 boolean offsetFromChildToParent, boolean clipToBounds) { 3030 3031 // already in the same coord system :) 3032 if (descendant == this) { 3033 return; 3034 } 3035 3036 ViewParent theParent = descendant.mParent; 3037 3038 // search and offset up to the parent 3039 while ((theParent != null) 3040 && (theParent instanceof View) 3041 && (theParent != this)) { 3042 3043 if (offsetFromChildToParent) { 3044 rect.offset(descendant.mLeft - descendant.mScrollX, 3045 descendant.mTop - descendant.mScrollY); 3046 if (clipToBounds) { 3047 View p = (View) theParent; 3048 rect.intersect(0, 0, p.mRight - p.mLeft, p.mBottom - p.mTop); 3049 } 3050 } else { 3051 if (clipToBounds) { 3052 View p = (View) theParent; 3053 rect.intersect(0, 0, p.mRight - p.mLeft, p.mBottom - p.mTop); 3054 } 3055 rect.offset(descendant.mScrollX - descendant.mLeft, 3056 descendant.mScrollY - descendant.mTop); 3057 } 3058 3059 descendant = (View) theParent; 3060 theParent = descendant.mParent; 3061 } 3062 3063 // now that we are up to this view, need to offset one more time 3064 // to get into our coordinate space 3065 if (theParent == this) { 3066 if (offsetFromChildToParent) { 3067 rect.offset(descendant.mLeft - descendant.mScrollX, 3068 descendant.mTop - descendant.mScrollY); 3069 } else { 3070 rect.offset(descendant.mScrollX - descendant.mLeft, 3071 descendant.mScrollY - descendant.mTop); 3072 } 3073 } else { 3074 throw new IllegalArgumentException("parameter must be a descendant of this view"); 3075 } 3076 } 3077 3078 /** 3079 * Offset the vertical location of all children of this view by the specified number of pixels. 3080 * 3081 * @param offset the number of pixels to offset 3082 * 3083 * @hide 3084 */ 3085 public void offsetChildrenTopAndBottom(int offset) { 3086 final int count = mChildrenCount; 3087 final View[] children = mChildren; 3088 3089 for (int i = 0; i < count; i++) { 3090 final View v = children[i]; 3091 v.mTop += offset; 3092 v.mBottom += offset; 3093 } 3094 } 3095 3096 /** 3097 * {@inheritDoc} 3098 */ 3099 public boolean getChildVisibleRect(View child, Rect r, android.graphics.Point offset) { 3100 int dx = child.mLeft - mScrollX; 3101 int dy = child.mTop - mScrollY; 3102 if (offset != null) { 3103 offset.x += dx; 3104 offset.y += dy; 3105 } 3106 r.offset(dx, dy); 3107 return r.intersect(0, 0, mRight - mLeft, mBottom - mTop) && 3108 (mParent == null || mParent.getChildVisibleRect(this, r, offset)); 3109 } 3110 3111 /** 3112 * {@inheritDoc} 3113 */ 3114 @Override 3115 protected abstract void onLayout(boolean changed, 3116 int l, int t, int r, int b); 3117 3118 /** 3119 * Indicates whether the view group has the ability to animate its children 3120 * after the first layout. 3121 * 3122 * @return true if the children can be animated, false otherwise 3123 */ 3124 protected boolean canAnimate() { 3125 return mLayoutAnimationController != null; 3126 } 3127 3128 /** 3129 * Runs the layout animation. Calling this method triggers a relayout of 3130 * this view group. 3131 */ 3132 public void startLayoutAnimation() { 3133 if (mLayoutAnimationController != null) { 3134 mGroupFlags |= FLAG_RUN_ANIMATION; 3135 requestLayout(); 3136 } 3137 } 3138 3139 /** 3140 * Schedules the layout animation to be played after the next layout pass 3141 * of this view group. This can be used to restart the layout animation 3142 * when the content of the view group changes or when the activity is 3143 * paused and resumed. 3144 */ 3145 public void scheduleLayoutAnimation() { 3146 mGroupFlags |= FLAG_RUN_ANIMATION; 3147 } 3148 3149 /** 3150 * Sets the layout animation controller used to animate the group's 3151 * children after the first layout. 3152 * 3153 * @param controller the animation controller 3154 */ 3155 public void setLayoutAnimation(LayoutAnimationController controller) { 3156 mLayoutAnimationController = controller; 3157 if (mLayoutAnimationController != null) { 3158 mGroupFlags |= FLAG_RUN_ANIMATION; 3159 } 3160 } 3161 3162 /** 3163 * Returns the layout animation controller used to animate the group's 3164 * children. 3165 * 3166 * @return the current animation controller 3167 */ 3168 public LayoutAnimationController getLayoutAnimation() { 3169 return mLayoutAnimationController; 3170 } 3171 3172 /** 3173 * Indicates whether the children's drawing cache is used during a layout 3174 * animation. By default, the drawing cache is enabled but this will prevent 3175 * nested layout animations from working. To nest animations, you must disable 3176 * the cache. 3177 * 3178 * @return true if the animation cache is enabled, false otherwise 3179 * 3180 * @see #setAnimationCacheEnabled(boolean) 3181 * @see View#setDrawingCacheEnabled(boolean) 3182 */ 3183 @ViewDebug.ExportedProperty 3184 public boolean isAnimationCacheEnabled() { 3185 return (mGroupFlags & FLAG_ANIMATION_CACHE) == FLAG_ANIMATION_CACHE; 3186 } 3187 3188 /** 3189 * Enables or disables the children's drawing cache during a layout animation. 3190 * By default, the drawing cache is enabled but this will prevent nested 3191 * layout animations from working. To nest animations, you must disable the 3192 * cache. 3193 * 3194 * @param enabled true to enable the animation cache, false otherwise 3195 * 3196 * @see #isAnimationCacheEnabled() 3197 * @see View#setDrawingCacheEnabled(boolean) 3198 */ 3199 public void setAnimationCacheEnabled(boolean enabled) { 3200 setBooleanFlag(FLAG_ANIMATION_CACHE, enabled); 3201 } 3202 3203 /** 3204 * Indicates whether this ViewGroup will always try to draw its children using their 3205 * drawing cache. By default this property is enabled. 3206 * 3207 * @return true if the animation cache is enabled, false otherwise 3208 * 3209 * @see #setAlwaysDrawnWithCacheEnabled(boolean) 3210 * @see #setChildrenDrawnWithCacheEnabled(boolean) 3211 * @see View#setDrawingCacheEnabled(boolean) 3212 */ 3213 @ViewDebug.ExportedProperty(category = "drawing") 3214 public boolean isAlwaysDrawnWithCacheEnabled() { 3215 return (mGroupFlags & FLAG_ALWAYS_DRAWN_WITH_CACHE) == FLAG_ALWAYS_DRAWN_WITH_CACHE; 3216 } 3217 3218 /** 3219 * Indicates whether this ViewGroup will always try to draw its children using their 3220 * drawing cache. This property can be set to true when the cache rendering is 3221 * slightly different from the children's normal rendering. Renderings can be different, 3222 * for instance, when the cache's quality is set to low. 3223 * 3224 * When this property is disabled, the ViewGroup will use the drawing cache of its 3225 * children only when asked to. It's usually the task of subclasses to tell ViewGroup 3226 * when to start using the drawing cache and when to stop using it. 3227 * 3228 * @param always true to always draw with the drawing cache, false otherwise 3229 * 3230 * @see #isAlwaysDrawnWithCacheEnabled() 3231 * @see #setChildrenDrawnWithCacheEnabled(boolean) 3232 * @see View#setDrawingCacheEnabled(boolean) 3233 * @see View#setDrawingCacheQuality(int) 3234 */ 3235 public void setAlwaysDrawnWithCacheEnabled(boolean always) { 3236 setBooleanFlag(FLAG_ALWAYS_DRAWN_WITH_CACHE, always); 3237 } 3238 3239 /** 3240 * Indicates whether the ViewGroup is currently drawing its children using 3241 * their drawing cache. 3242 * 3243 * @return true if children should be drawn with their cache, false otherwise 3244 * 3245 * @see #setAlwaysDrawnWithCacheEnabled(boolean) 3246 * @see #setChildrenDrawnWithCacheEnabled(boolean) 3247 */ 3248 @ViewDebug.ExportedProperty(category = "drawing") 3249 protected boolean isChildrenDrawnWithCacheEnabled() { 3250 return (mGroupFlags & FLAG_CHILDREN_DRAWN_WITH_CACHE) == FLAG_CHILDREN_DRAWN_WITH_CACHE; 3251 } 3252 3253 /** 3254 * Tells the ViewGroup to draw its children using their drawing cache. This property 3255 * is ignored when {@link #isAlwaysDrawnWithCacheEnabled()} is true. A child's drawing cache 3256 * will be used only if it has been enabled. 3257 * 3258 * Subclasses should call this method to start and stop using the drawing cache when 3259 * they perform performance sensitive operations, like scrolling or animating. 3260 * 3261 * @param enabled true if children should be drawn with their cache, false otherwise 3262 * 3263 * @see #setAlwaysDrawnWithCacheEnabled(boolean) 3264 * @see #isChildrenDrawnWithCacheEnabled() 3265 */ 3266 protected void setChildrenDrawnWithCacheEnabled(boolean enabled) { 3267 setBooleanFlag(FLAG_CHILDREN_DRAWN_WITH_CACHE, enabled); 3268 } 3269 3270 /** 3271 * Indicates whether the ViewGroup is drawing its children in the order defined by 3272 * {@link #getChildDrawingOrder(int, int)}. 3273 * 3274 * @return true if children drawing order is defined by {@link #getChildDrawingOrder(int, int)}, 3275 * false otherwise 3276 * 3277 * @see #setChildrenDrawingOrderEnabled(boolean) 3278 * @see #getChildDrawingOrder(int, int) 3279 */ 3280 @ViewDebug.ExportedProperty(category = "drawing") 3281 protected boolean isChildrenDrawingOrderEnabled() { 3282 return (mGroupFlags & FLAG_USE_CHILD_DRAWING_ORDER) == FLAG_USE_CHILD_DRAWING_ORDER; 3283 } 3284 3285 /** 3286 * Tells the ViewGroup whether to draw its children in the order defined by the method 3287 * {@link #getChildDrawingOrder(int, int)}. 3288 * 3289 * @param enabled true if the order of the children when drawing is determined by 3290 * {@link #getChildDrawingOrder(int, int)}, false otherwise 3291 * 3292 * @see #isChildrenDrawingOrderEnabled() 3293 * @see #getChildDrawingOrder(int, int) 3294 */ 3295 protected void setChildrenDrawingOrderEnabled(boolean enabled) { 3296 setBooleanFlag(FLAG_USE_CHILD_DRAWING_ORDER, enabled); 3297 } 3298 3299 private void setBooleanFlag(int flag, boolean value) { 3300 if (value) { 3301 mGroupFlags |= flag; 3302 } else { 3303 mGroupFlags &= ~flag; 3304 } 3305 } 3306 3307 /** 3308 * Returns an integer indicating what types of drawing caches are kept in memory. 3309 * 3310 * @see #setPersistentDrawingCache(int) 3311 * @see #setAnimationCacheEnabled(boolean) 3312 * 3313 * @return one or a combination of {@link #PERSISTENT_NO_CACHE}, 3314 * {@link #PERSISTENT_ANIMATION_CACHE}, {@link #PERSISTENT_SCROLLING_CACHE} 3315 * and {@link #PERSISTENT_ALL_CACHES} 3316 */ 3317 @ViewDebug.ExportedProperty(category = "drawing", mapping = { 3318 @ViewDebug.IntToString(from = PERSISTENT_NO_CACHE, to = "NONE"), 3319 @ViewDebug.IntToString(from = PERSISTENT_ANIMATION_CACHE, to = "ANIMATION"), 3320 @ViewDebug.IntToString(from = PERSISTENT_SCROLLING_CACHE, to = "SCROLLING"), 3321 @ViewDebug.IntToString(from = PERSISTENT_ALL_CACHES, to = "ALL") 3322 }) 3323 public int getPersistentDrawingCache() { 3324 return mPersistentDrawingCache; 3325 } 3326 3327 /** 3328 * Indicates what types of drawing caches should be kept in memory after 3329 * they have been created. 3330 * 3331 * @see #getPersistentDrawingCache() 3332 * @see #setAnimationCacheEnabled(boolean) 3333 * 3334 * @param drawingCacheToKeep one or a combination of {@link #PERSISTENT_NO_CACHE}, 3335 * {@link #PERSISTENT_ANIMATION_CACHE}, {@link #PERSISTENT_SCROLLING_CACHE} 3336 * and {@link #PERSISTENT_ALL_CACHES} 3337 */ 3338 public void setPersistentDrawingCache(int drawingCacheToKeep) { 3339 mPersistentDrawingCache = drawingCacheToKeep & PERSISTENT_ALL_CACHES; 3340 } 3341 3342 /** 3343 * Returns a new set of layout parameters based on the supplied attributes set. 3344 * 3345 * @param attrs the attributes to build the layout parameters from 3346 * 3347 * @return an instance of {@link android.view.ViewGroup.LayoutParams} or one 3348 * of its descendants 3349 */ 3350 public LayoutParams generateLayoutParams(AttributeSet attrs) { 3351 return new LayoutParams(getContext(), attrs); 3352 } 3353 3354 /** 3355 * Returns a safe set of layout parameters based on the supplied layout params. 3356 * When a ViewGroup is passed a View whose layout params do not pass the test of 3357 * {@link #checkLayoutParams(android.view.ViewGroup.LayoutParams)}, this method 3358 * is invoked. This method should return a new set of layout params suitable for 3359 * this ViewGroup, possibly by copying the appropriate attributes from the 3360 * specified set of layout params. 3361 * 3362 * @param p The layout parameters to convert into a suitable set of layout parameters 3363 * for this ViewGroup. 3364 * 3365 * @return an instance of {@link android.view.ViewGroup.LayoutParams} or one 3366 * of its descendants 3367 */ 3368 protected LayoutParams generateLayoutParams(ViewGroup.LayoutParams p) { 3369 return p; 3370 } 3371 3372 /** 3373 * Returns a set of default layout parameters. These parameters are requested 3374 * when the View passed to {@link #addView(View)} has no layout parameters 3375 * already set. If null is returned, an exception is thrown from addView. 3376 * 3377 * @return a set of default layout parameters or null 3378 */ 3379 protected LayoutParams generateDefaultLayoutParams() { 3380 return new LayoutParams(LayoutParams.WRAP_CONTENT, LayoutParams.WRAP_CONTENT); 3381 } 3382 3383 /** 3384 * @hide 3385 */ 3386 @Override 3387 protected boolean dispatchConsistencyCheck(int consistency) { 3388 boolean result = super.dispatchConsistencyCheck(consistency); 3389 3390 final int count = mChildrenCount; 3391 final View[] children = mChildren; 3392 for (int i = 0; i < count; i++) { 3393 if (!children[i].dispatchConsistencyCheck(consistency)) result = false; 3394 } 3395 3396 return result; 3397 } 3398 3399 /** 3400 * @hide 3401 */ 3402 @Override 3403 protected boolean onConsistencyCheck(int consistency) { 3404 boolean result = super.onConsistencyCheck(consistency); 3405 3406 final boolean checkLayout = (consistency & ViewDebug.CONSISTENCY_LAYOUT) != 0; 3407 final boolean checkDrawing = (consistency & ViewDebug.CONSISTENCY_DRAWING) != 0; 3408 3409 if (checkLayout) { 3410 final int count = mChildrenCount; 3411 final View[] children = mChildren; 3412 for (int i = 0; i < count; i++) { 3413 if (children[i].getParent() != this) { 3414 result = false; 3415 android.util.Log.d(ViewDebug.CONSISTENCY_LOG_TAG, 3416 "View " + children[i] + " has no parent/a parent that is not " + this); 3417 } 3418 } 3419 } 3420 3421 if (checkDrawing) { 3422 // If this group is dirty, check that the parent is dirty as well 3423 if ((mPrivateFlags & DIRTY_MASK) != 0) { 3424 final ViewParent parent = getParent(); 3425 if (parent != null && !(parent instanceof ViewRoot)) { 3426 if ((((View) parent).mPrivateFlags & DIRTY_MASK) == 0) { 3427 result = false; 3428 android.util.Log.d(ViewDebug.CONSISTENCY_LOG_TAG, 3429 "ViewGroup " + this + " is dirty but its parent is not: " + this); 3430 } 3431 } 3432 } 3433 } 3434 3435 return result; 3436 } 3437 3438 /** 3439 * {@inheritDoc} 3440 */ 3441 @Override 3442 protected void debug(int depth) { 3443 super.debug(depth); 3444 String output; 3445 3446 if (mFocused != null) { 3447 output = debugIndent(depth); 3448 output += "mFocused"; 3449 Log.d(VIEW_LOG_TAG, output); 3450 } 3451 if (mChildrenCount != 0) { 3452 output = debugIndent(depth); 3453 output += "{"; 3454 Log.d(VIEW_LOG_TAG, output); 3455 } 3456 int count = mChildrenCount; 3457 for (int i = 0; i < count; i++) { 3458 View child = mChildren[i]; 3459 child.debug(depth + 1); 3460 } 3461 3462 if (mChildrenCount != 0) { 3463 output = debugIndent(depth); 3464 output += "}"; 3465 Log.d(VIEW_LOG_TAG, output); 3466 } 3467 } 3468 3469 /** 3470 * Returns the position in the group of the specified child view. 3471 * 3472 * @param child the view for which to get the position 3473 * @return a positive integer representing the position of the view in the 3474 * group, or -1 if the view does not exist in the group 3475 */ 3476 public int indexOfChild(View child) { 3477 final int count = mChildrenCount; 3478 final View[] children = mChildren; 3479 for (int i = 0; i < count; i++) { 3480 if (children[i] == child) { 3481 return i; 3482 } 3483 } 3484 return -1; 3485 } 3486 3487 /** 3488 * Returns the number of children in the group. 3489 * 3490 * @return a positive integer representing the number of children in 3491 * the group 3492 */ 3493 public int getChildCount() { 3494 return mChildrenCount; 3495 } 3496 3497 /** 3498 * Returns the view at the specified position in the group. 3499 * 3500 * @param index the position at which to get the view from 3501 * @return the view at the specified position or null if the position 3502 * does not exist within the group 3503 */ 3504 public View getChildAt(int index) { 3505 try { 3506 return mChildren[index]; 3507 } catch (IndexOutOfBoundsException ex) { 3508 return null; 3509 } 3510 } 3511 3512 /** 3513 * Ask all of the children of this view to measure themselves, taking into 3514 * account both the MeasureSpec requirements for this view and its padding. 3515 * We skip children that are in the GONE state The heavy lifting is done in 3516 * getChildMeasureSpec. 3517 * 3518 * @param widthMeasureSpec The width requirements for this view 3519 * @param heightMeasureSpec The height requirements for this view 3520 */ 3521 protected void measureChildren(int widthMeasureSpec, int heightMeasureSpec) { 3522 final int size = mChildrenCount; 3523 final View[] children = mChildren; 3524 for (int i = 0; i < size; ++i) { 3525 final View child = children[i]; 3526 if ((child.mViewFlags & VISIBILITY_MASK) != GONE) { 3527 measureChild(child, widthMeasureSpec, heightMeasureSpec); 3528 } 3529 } 3530 } 3531 3532 /** 3533 * Ask one of the children of this view to measure itself, taking into 3534 * account both the MeasureSpec requirements for this view and its padding. 3535 * The heavy lifting is done in getChildMeasureSpec. 3536 * 3537 * @param child The child to measure 3538 * @param parentWidthMeasureSpec The width requirements for this view 3539 * @param parentHeightMeasureSpec The height requirements for this view 3540 */ 3541 protected void measureChild(View child, int parentWidthMeasureSpec, 3542 int parentHeightMeasureSpec) { 3543 final LayoutParams lp = child.getLayoutParams(); 3544 3545 final int childWidthMeasureSpec = getChildMeasureSpec(parentWidthMeasureSpec, 3546 mPaddingLeft + mPaddingRight, lp.width); 3547 final int childHeightMeasureSpec = getChildMeasureSpec(parentHeightMeasureSpec, 3548 mPaddingTop + mPaddingBottom, lp.height); 3549 3550 child.measure(childWidthMeasureSpec, childHeightMeasureSpec); 3551 } 3552 3553 /** 3554 * Ask one of the children of this view to measure itself, taking into 3555 * account both the MeasureSpec requirements for this view and its padding 3556 * and margins. The child must have MarginLayoutParams The heavy lifting is 3557 * done in getChildMeasureSpec. 3558 * 3559 * @param child The child to measure 3560 * @param parentWidthMeasureSpec The width requirements for this view 3561 * @param widthUsed Extra space that has been used up by the parent 3562 * horizontally (possibly by other children of the parent) 3563 * @param parentHeightMeasureSpec The height requirements for this view 3564 * @param heightUsed Extra space that has been used up by the parent 3565 * vertically (possibly by other children of the parent) 3566 */ 3567 protected void measureChildWithMargins(View child, 3568 int parentWidthMeasureSpec, int widthUsed, 3569 int parentHeightMeasureSpec, int heightUsed) { 3570 final MarginLayoutParams lp = (MarginLayoutParams) child.getLayoutParams(); 3571 3572 final int childWidthMeasureSpec = getChildMeasureSpec(parentWidthMeasureSpec, 3573 mPaddingLeft + mPaddingRight + lp.leftMargin + lp.rightMargin 3574 + widthUsed, lp.width); 3575 final int childHeightMeasureSpec = getChildMeasureSpec(parentHeightMeasureSpec, 3576 mPaddingTop + mPaddingBottom + lp.topMargin + lp.bottomMargin 3577 + heightUsed, lp.height); 3578 3579 child.measure(childWidthMeasureSpec, childHeightMeasureSpec); 3580 } 3581 3582 /** 3583 * Does the hard part of measureChildren: figuring out the MeasureSpec to 3584 * pass to a particular child. This method figures out the right MeasureSpec 3585 * for one dimension (height or width) of one child view. 3586 * 3587 * The goal is to combine information from our MeasureSpec with the 3588 * LayoutParams of the child to get the best possible results. For example, 3589 * if the this view knows its size (because its MeasureSpec has a mode of 3590 * EXACTLY), and the child has indicated in its LayoutParams that it wants 3591 * to be the same size as the parent, the parent should ask the child to 3592 * layout given an exact size. 3593 * 3594 * @param spec The requirements for this view 3595 * @param padding The padding of this view for the current dimension and 3596 * margins, if applicable 3597 * @param childDimension How big the child wants to be in the current 3598 * dimension 3599 * @return a MeasureSpec integer for the child 3600 */ 3601 public static int getChildMeasureSpec(int spec, int padding, int childDimension) { 3602 int specMode = MeasureSpec.getMode(spec); 3603 int specSize = MeasureSpec.getSize(spec); 3604 3605 int size = Math.max(0, specSize - padding); 3606 3607 int resultSize = 0; 3608 int resultMode = 0; 3609 3610 switch (specMode) { 3611 // Parent has imposed an exact size on us 3612 case MeasureSpec.EXACTLY: 3613 if (childDimension >= 0) { 3614 resultSize = childDimension; 3615 resultMode = MeasureSpec.EXACTLY; 3616 } else if (childDimension == LayoutParams.MATCH_PARENT) { 3617 // Child wants to be our size. So be it. 3618 resultSize = size; 3619 resultMode = MeasureSpec.EXACTLY; 3620 } else if (childDimension == LayoutParams.WRAP_CONTENT) { 3621 // Child wants to determine its own size. It can't be 3622 // bigger than us. 3623 resultSize = size; 3624 resultMode = MeasureSpec.AT_MOST; 3625 } 3626 break; 3627 3628 // Parent has imposed a maximum size on us 3629 case MeasureSpec.AT_MOST: 3630 if (childDimension >= 0) { 3631 // Child wants a specific size... so be it 3632 resultSize = childDimension; 3633 resultMode = MeasureSpec.EXACTLY; 3634 } else if (childDimension == LayoutParams.MATCH_PARENT) { 3635 // Child wants to be our size, but our size is not fixed. 3636 // Constrain child to not be bigger than us. 3637 resultSize = size; 3638 resultMode = MeasureSpec.AT_MOST; 3639 } else if (childDimension == LayoutParams.WRAP_CONTENT) { 3640 // Child wants to determine its own size. It can't be 3641 // bigger than us. 3642 resultSize = size; 3643 resultMode = MeasureSpec.AT_MOST; 3644 } 3645 break; 3646 3647 // Parent asked to see how big we want to be 3648 case MeasureSpec.UNSPECIFIED: 3649 if (childDimension >= 0) { 3650 // Child wants a specific size... let him have it 3651 resultSize = childDimension; 3652 resultMode = MeasureSpec.EXACTLY; 3653 } else if (childDimension == LayoutParams.MATCH_PARENT) { 3654 // Child wants to be our size... find out how big it should 3655 // be 3656 resultSize = 0; 3657 resultMode = MeasureSpec.UNSPECIFIED; 3658 } else if (childDimension == LayoutParams.WRAP_CONTENT) { 3659 // Child wants to determine its own size.... find out how 3660 // big it should be 3661 resultSize = 0; 3662 resultMode = MeasureSpec.UNSPECIFIED; 3663 } 3664 break; 3665 } 3666 return MeasureSpec.makeMeasureSpec(resultSize, resultMode); 3667 } 3668 3669 3670 /** 3671 * Removes any pending animations for views that have been removed. Call 3672 * this if you don't want animations for exiting views to stack up. 3673 */ 3674 public void clearDisappearingChildren() { 3675 if (mDisappearingChildren != null) { 3676 mDisappearingChildren.clear(); 3677 } 3678 } 3679 3680 /** 3681 * Add a view which is removed from mChildren but still needs animation 3682 * 3683 * @param v View to add 3684 */ 3685 private void addDisappearingView(View v) { 3686 ArrayList<View> disappearingChildren = mDisappearingChildren; 3687 3688 if (disappearingChildren == null) { 3689 disappearingChildren = mDisappearingChildren = new ArrayList<View>(); 3690 } 3691 3692 disappearingChildren.add(v); 3693 } 3694 3695 /** 3696 * Cleanup a view when its animation is done. This may mean removing it from 3697 * the list of disappearing views. 3698 * 3699 * @param view The view whose animation has finished 3700 * @param animation The animation, cannot be null 3701 */ 3702 private void finishAnimatingView(final View view, Animation animation) { 3703 final ArrayList<View> disappearingChildren = mDisappearingChildren; 3704 if (disappearingChildren != null) { 3705 if (disappearingChildren.contains(view)) { 3706 disappearingChildren.remove(view); 3707 3708 if (view.mAttachInfo != null) { 3709 view.dispatchDetachedFromWindow(); 3710 } 3711 3712 view.clearAnimation(); 3713 mGroupFlags |= FLAG_INVALIDATE_REQUIRED; 3714 } 3715 } 3716 3717 if (animation != null && !animation.getFillAfter()) { 3718 view.clearAnimation(); 3719 } 3720 3721 if ((view.mPrivateFlags & ANIMATION_STARTED) == ANIMATION_STARTED) { 3722 view.onAnimationEnd(); 3723 // Should be performed by onAnimationEnd() but this avoid an infinite loop, 3724 // so we'd rather be safe than sorry 3725 view.mPrivateFlags &= ~ANIMATION_STARTED; 3726 // Draw one more frame after the animation is done 3727 mGroupFlags |= FLAG_INVALIDATE_REQUIRED; 3728 } 3729 } 3730 3731 /** 3732 * This method tells the ViewGroup that the given View object, which should have this 3733 * ViewGroup as its parent, 3734 * should be kept around (re-displayed when the ViewGroup draws its children) even if it 3735 * is removed from its parent. This allows animations, such as those used by 3736 * {@link android.app.Fragment} and {@link android.animation.LayoutTransition} to animate 3737 * the removal of views. A call to this method should always be accompanied by a later call 3738 * to {@link #endViewTransition(View)}, such as after an animation on the View has finished, 3739 * so that the View finally gets removed. 3740 * 3741 * @param view The View object to be kept visible even if it gets removed from its parent. 3742 */ 3743 public void startViewTransition(View view) { 3744 if (view.mParent == this) { 3745 if (mTransitioningViews == null) { 3746 mTransitioningViews = new ArrayList<View>(); 3747 } 3748 mTransitioningViews.add(view); 3749 } 3750 } 3751 3752 /** 3753 * This method should always be called following an earlier call to 3754 * {@link #startViewTransition(View)}. The given View is finally removed from its parent 3755 * and will no longer be displayed. Note that this method does not perform the functionality 3756 * of removing a view from its parent; it just discontinues the display of a View that 3757 * has previously been removed. 3758 * 3759 * @return view The View object that has been removed but is being kept around in the visible 3760 * hierarchy by an earlier call to {@link #startViewTransition(View)}. 3761 */ 3762 public void endViewTransition(View view) { 3763 if (mTransitioningViews != null) { 3764 mTransitioningViews.remove(view); 3765 final ArrayList<View> disappearingChildren = mDisappearingChildren; 3766 if (disappearingChildren != null && disappearingChildren.contains(view)) { 3767 disappearingChildren.remove(view); 3768 if (view.mAttachInfo != null) { 3769 view.dispatchDetachedFromWindow(); 3770 } 3771 if (view.mParent != null) { 3772 view.mParent = null; 3773 } 3774 mGroupFlags |= FLAG_INVALIDATE_REQUIRED; 3775 } 3776 } 3777 } 3778 3779 private LayoutTransition.TransitionListener mLayoutTransitionListener = 3780 new LayoutTransition.TransitionListener() { 3781 @Override 3782 public void startTransition(LayoutTransition transition, ViewGroup container, 3783 View view, int transitionType) { 3784 // We only care about disappearing items, since we need special logic to keep 3785 // those items visible after they've been 'removed' 3786 if (transitionType == LayoutTransition.DISAPPEARING) { 3787 startViewTransition(view); 3788 } 3789 } 3790 3791 @Override 3792 public void endTransition(LayoutTransition transition, ViewGroup container, 3793 View view, int transitionType) { 3794 if (transitionType == LayoutTransition.DISAPPEARING && mTransitioningViews != null) { 3795 endViewTransition(view); 3796 } 3797 } 3798 }; 3799 3800 /** 3801 * {@inheritDoc} 3802 */ 3803 @Override 3804 public boolean gatherTransparentRegion(Region region) { 3805 // If no transparent regions requested, we are always opaque. 3806 final boolean meOpaque = (mPrivateFlags & View.REQUEST_TRANSPARENT_REGIONS) == 0; 3807 if (meOpaque && region == null) { 3808 // The caller doesn't care about the region, so stop now. 3809 return true; 3810 } 3811 super.gatherTransparentRegion(region); 3812 final View[] children = mChildren; 3813 final int count = mChildrenCount; 3814 boolean noneOfTheChildrenAreTransparent = true; 3815 for (int i = 0; i < count; i++) { 3816 final View child = children[i]; 3817 if ((child.mViewFlags & VISIBILITY_MASK) != GONE || child.getAnimation() != null) { 3818 if (!child.gatherTransparentRegion(region)) { 3819 noneOfTheChildrenAreTransparent = false; 3820 } 3821 } 3822 } 3823 return meOpaque || noneOfTheChildrenAreTransparent; 3824 } 3825 3826 /** 3827 * {@inheritDoc} 3828 */ 3829 public void requestTransparentRegion(View child) { 3830 if (child != null) { 3831 child.mPrivateFlags |= View.REQUEST_TRANSPARENT_REGIONS; 3832 if (mParent != null) { 3833 mParent.requestTransparentRegion(this); 3834 } 3835 } 3836 } 3837 3838 3839 @Override 3840 protected boolean fitSystemWindows(Rect insets) { 3841 boolean done = super.fitSystemWindows(insets); 3842 if (!done) { 3843 final int count = mChildrenCount; 3844 final View[] children = mChildren; 3845 for (int i = 0; i < count; i++) { 3846 done = children[i].fitSystemWindows(insets); 3847 if (done) { 3848 break; 3849 } 3850 } 3851 } 3852 return done; 3853 } 3854 3855 /** 3856 * Returns the animation listener to which layout animation events are 3857 * sent. 3858 * 3859 * @return an {@link android.view.animation.Animation.AnimationListener} 3860 */ 3861 public Animation.AnimationListener getLayoutAnimationListener() { 3862 return mAnimationListener; 3863 } 3864 3865 @Override 3866 protected void drawableStateChanged() { 3867 super.drawableStateChanged(); 3868 3869 if ((mGroupFlags & FLAG_NOTIFY_CHILDREN_ON_DRAWABLE_STATE_CHANGE) != 0) { 3870 if ((mGroupFlags & FLAG_ADD_STATES_FROM_CHILDREN) != 0) { 3871 throw new IllegalStateException("addStateFromChildren cannot be enabled if a" 3872 + " child has duplicateParentState set to true"); 3873 } 3874 3875 final View[] children = mChildren; 3876 final int count = mChildrenCount; 3877 3878 for (int i = 0; i < count; i++) { 3879 final View child = children[i]; 3880 if ((child.mViewFlags & DUPLICATE_PARENT_STATE) != 0) { 3881 child.refreshDrawableState(); 3882 } 3883 } 3884 } 3885 } 3886 3887 @Override 3888 protected int[] onCreateDrawableState(int extraSpace) { 3889 if ((mGroupFlags & FLAG_ADD_STATES_FROM_CHILDREN) == 0) { 3890 return super.onCreateDrawableState(extraSpace); 3891 } 3892 3893 int need = 0; 3894 int n = getChildCount(); 3895 for (int i = 0; i < n; i++) { 3896 int[] childState = getChildAt(i).getDrawableState(); 3897 3898 if (childState != null) { 3899 need += childState.length; 3900 } 3901 } 3902 3903 int[] state = super.onCreateDrawableState(extraSpace + need); 3904 3905 for (int i = 0; i < n; i++) { 3906 int[] childState = getChildAt(i).getDrawableState(); 3907 3908 if (childState != null) { 3909 state = mergeDrawableStates(state, childState); 3910 } 3911 } 3912 3913 return state; 3914 } 3915 3916 /** 3917 * Sets whether this ViewGroup's drawable states also include 3918 * its children's drawable states. This is used, for example, to 3919 * make a group appear to be focused when its child EditText or button 3920 * is focused. 3921 */ 3922 public void setAddStatesFromChildren(boolean addsStates) { 3923 if (addsStates) { 3924 mGroupFlags |= FLAG_ADD_STATES_FROM_CHILDREN; 3925 } else { 3926 mGroupFlags &= ~FLAG_ADD_STATES_FROM_CHILDREN; 3927 } 3928 3929 refreshDrawableState(); 3930 } 3931 3932 /** 3933 * Returns whether this ViewGroup's drawable states also include 3934 * its children's drawable states. This is used, for example, to 3935 * make a group appear to be focused when its child EditText or button 3936 * is focused. 3937 */ 3938 public boolean addStatesFromChildren() { 3939 return (mGroupFlags & FLAG_ADD_STATES_FROM_CHILDREN) != 0; 3940 } 3941 3942 /** 3943 * If {link #addStatesFromChildren} is true, refreshes this group's 3944 * drawable state (to include the states from its children). 3945 */ 3946 public void childDrawableStateChanged(View child) { 3947 if ((mGroupFlags & FLAG_ADD_STATES_FROM_CHILDREN) != 0) { 3948 refreshDrawableState(); 3949 } 3950 } 3951 3952 /** 3953 * Specifies the animation listener to which layout animation events must 3954 * be sent. Only 3955 * {@link android.view.animation.Animation.AnimationListener#onAnimationStart(Animation)} 3956 * and 3957 * {@link android.view.animation.Animation.AnimationListener#onAnimationEnd(Animation)} 3958 * are invoked. 3959 * 3960 * @param animationListener the layout animation listener 3961 */ 3962 public void setLayoutAnimationListener(Animation.AnimationListener animationListener) { 3963 mAnimationListener = animationListener; 3964 } 3965 3966 /** 3967 * LayoutParams are used by views to tell their parents how they want to be 3968 * laid out. See 3969 * {@link android.R.styleable#ViewGroup_Layout ViewGroup Layout Attributes} 3970 * for a list of all child view attributes that this class supports. 3971 * 3972 * <p> 3973 * The base LayoutParams class just describes how big the view wants to be 3974 * for both width and height. For each dimension, it can specify one of: 3975 * <ul> 3976 * <li>FILL_PARENT (renamed MATCH_PARENT in API Level 8 and higher), which 3977 * means that the view wants to be as big as its parent (minus padding) 3978 * <li> WRAP_CONTENT, which means that the view wants to be just big enough 3979 * to enclose its content (plus padding) 3980 * <li> an exact number 3981 * </ul> 3982 * There are subclasses of LayoutParams for different subclasses of 3983 * ViewGroup. For example, AbsoluteLayout has its own subclass of 3984 * LayoutParams which adds an X and Y value. 3985 * 3986 * @attr ref android.R.styleable#ViewGroup_Layout_layout_height 3987 * @attr ref android.R.styleable#ViewGroup_Layout_layout_width 3988 */ 3989 public static class LayoutParams { 3990 /** 3991 * Special value for the height or width requested by a View. 3992 * FILL_PARENT means that the view wants to be as big as its parent, 3993 * minus the parent's padding, if any. This value is deprecated 3994 * starting in API Level 8 and replaced by {@link #MATCH_PARENT}. 3995 */ 3996 @SuppressWarnings({"UnusedDeclaration"}) 3997 @Deprecated 3998 public static final int FILL_PARENT = -1; 3999 4000 /** 4001 * Special value for the height or width requested by a View. 4002 * MATCH_PARENT means that the view wants to be as big as its parent, 4003 * minus the parent's padding, if any. Introduced in API Level 8. 4004 */ 4005 public static final int MATCH_PARENT = -1; 4006 4007 /** 4008 * Special value for the height or width requested by a View. 4009 * WRAP_CONTENT means that the view wants to be just large enough to fit 4010 * its own internal content, taking its own padding into account. 4011 */ 4012 public static final int WRAP_CONTENT = -2; 4013 4014 /** 4015 * Information about how wide the view wants to be. Can be one of the 4016 * constants FILL_PARENT (replaced by MATCH_PARENT , 4017 * in API Level 8) or WRAP_CONTENT. or an exact size. 4018 */ 4019 @ViewDebug.ExportedProperty(category = "layout", mapping = { 4020 @ViewDebug.IntToString(from = MATCH_PARENT, to = "MATCH_PARENT"), 4021 @ViewDebug.IntToString(from = WRAP_CONTENT, to = "WRAP_CONTENT") 4022 }) 4023 public int width; 4024 4025 /** 4026 * Information about how tall the view wants to be. Can be one of the 4027 * constants FILL_PARENT (replaced by MATCH_PARENT , 4028 * in API Level 8) or WRAP_CONTENT. or an exact size. 4029 */ 4030 @ViewDebug.ExportedProperty(category = "layout", mapping = { 4031 @ViewDebug.IntToString(from = MATCH_PARENT, to = "MATCH_PARENT"), 4032 @ViewDebug.IntToString(from = WRAP_CONTENT, to = "WRAP_CONTENT") 4033 }) 4034 public int height; 4035 4036 /** 4037 * Used to animate layouts. 4038 */ 4039 public LayoutAnimationController.AnimationParameters layoutAnimationParameters; 4040 4041 /** 4042 * Creates a new set of layout parameters. The values are extracted from 4043 * the supplied attributes set and context. The XML attributes mapped 4044 * to this set of layout parameters are: 4045 * 4046 * <ul> 4047 * <li><code>layout_width</code>: the width, either an exact value, 4048 * {@link #WRAP_CONTENT}, or {@link #FILL_PARENT} (replaced by 4049 * {@link #MATCH_PARENT} in API Level 8)</li> 4050 * <li><code>layout_height</code>: the height, either an exact value, 4051 * {@link #WRAP_CONTENT}, or {@link #FILL_PARENT} (replaced by 4052 * {@link #MATCH_PARENT} in API Level 8)</li> 4053 * </ul> 4054 * 4055 * @param c the application environment 4056 * @param attrs the set of attributes from which to extract the layout 4057 * parameters' values 4058 */ 4059 public LayoutParams(Context c, AttributeSet attrs) { 4060 TypedArray a = c.obtainStyledAttributes(attrs, R.styleable.ViewGroup_Layout); 4061 setBaseAttributes(a, 4062 R.styleable.ViewGroup_Layout_layout_width, 4063 R.styleable.ViewGroup_Layout_layout_height); 4064 a.recycle(); 4065 } 4066 4067 /** 4068 * Creates a new set of layout parameters with the specified width 4069 * and height. 4070 * 4071 * @param width the width, either {@link #WRAP_CONTENT}, 4072 * {@link #FILL_PARENT} (replaced by {@link #MATCH_PARENT} in 4073 * API Level 8), or a fixed size in pixels 4074 * @param height the height, either {@link #WRAP_CONTENT}, 4075 * {@link #FILL_PARENT} (replaced by {@link #MATCH_PARENT} in 4076 * API Level 8), or a fixed size in pixels 4077 */ 4078 public LayoutParams(int width, int height) { 4079 this.width = width; 4080 this.height = height; 4081 } 4082 4083 /** 4084 * Copy constructor. Clones the width and height values of the source. 4085 * 4086 * @param source The layout params to copy from. 4087 */ 4088 public LayoutParams(LayoutParams source) { 4089 this.width = source.width; 4090 this.height = source.height; 4091 } 4092 4093 /** 4094 * Used internally by MarginLayoutParams. 4095 * @hide 4096 */ 4097 LayoutParams() { 4098 } 4099 4100 /** 4101 * Extracts the layout parameters from the supplied attributes. 4102 * 4103 * @param a the style attributes to extract the parameters from 4104 * @param widthAttr the identifier of the width attribute 4105 * @param heightAttr the identifier of the height attribute 4106 */ 4107 protected void setBaseAttributes(TypedArray a, int widthAttr, int heightAttr) { 4108 width = a.getLayoutDimension(widthAttr, "layout_width"); 4109 height = a.getLayoutDimension(heightAttr, "layout_height"); 4110 } 4111 4112 /** 4113 * Returns a String representation of this set of layout parameters. 4114 * 4115 * @param output the String to prepend to the internal representation 4116 * @return a String with the following format: output + 4117 * "ViewGroup.LayoutParams={ width=WIDTH, height=HEIGHT }" 4118 * 4119 * @hide 4120 */ 4121 public String debug(String output) { 4122 return output + "ViewGroup.LayoutParams={ width=" 4123 + sizeToString(width) + ", height=" + sizeToString(height) + " }"; 4124 } 4125 4126 /** 4127 * Converts the specified size to a readable String. 4128 * 4129 * @param size the size to convert 4130 * @return a String instance representing the supplied size 4131 * 4132 * @hide 4133 */ 4134 protected static String sizeToString(int size) { 4135 if (size == WRAP_CONTENT) { 4136 return "wrap-content"; 4137 } 4138 if (size == MATCH_PARENT) { 4139 return "match-parent"; 4140 } 4141 return String.valueOf(size); 4142 } 4143 } 4144 4145 /** 4146 * Per-child layout information for layouts that support margins. 4147 * See 4148 * {@link android.R.styleable#ViewGroup_MarginLayout ViewGroup Margin Layout Attributes} 4149 * for a list of all child view attributes that this class supports. 4150 */ 4151 public static class MarginLayoutParams extends ViewGroup.LayoutParams { 4152 /** 4153 * The left margin in pixels of the child. 4154 */ 4155 @ViewDebug.ExportedProperty(category = "layout") 4156 public int leftMargin; 4157 4158 /** 4159 * The top margin in pixels of the child. 4160 */ 4161 @ViewDebug.ExportedProperty(category = "layout") 4162 public int topMargin; 4163 4164 /** 4165 * The right margin in pixels of the child. 4166 */ 4167 @ViewDebug.ExportedProperty(category = "layout") 4168 public int rightMargin; 4169 4170 /** 4171 * The bottom margin in pixels of the child. 4172 */ 4173 @ViewDebug.ExportedProperty(category = "layout") 4174 public int bottomMargin; 4175 4176 /** 4177 * Creates a new set of layout parameters. The values are extracted from 4178 * the supplied attributes set and context. 4179 * 4180 * @param c the application environment 4181 * @param attrs the set of attributes from which to extract the layout 4182 * parameters' values 4183 */ 4184 public MarginLayoutParams(Context c, AttributeSet attrs) { 4185 super(); 4186 4187 TypedArray a = c.obtainStyledAttributes(attrs, R.styleable.ViewGroup_MarginLayout); 4188 setBaseAttributes(a, 4189 R.styleable.ViewGroup_MarginLayout_layout_width, 4190 R.styleable.ViewGroup_MarginLayout_layout_height); 4191 4192 int margin = a.getDimensionPixelSize( 4193 com.android.internal.R.styleable.ViewGroup_MarginLayout_layout_margin, -1); 4194 if (margin >= 0) { 4195 leftMargin = margin; 4196 topMargin = margin; 4197 rightMargin= margin; 4198 bottomMargin = margin; 4199 } else { 4200 leftMargin = a.getDimensionPixelSize( 4201 R.styleable.ViewGroup_MarginLayout_layout_marginLeft, 0); 4202 topMargin = a.getDimensionPixelSize( 4203 R.styleable.ViewGroup_MarginLayout_layout_marginTop, 0); 4204 rightMargin = a.getDimensionPixelSize( 4205 R.styleable.ViewGroup_MarginLayout_layout_marginRight, 0); 4206 bottomMargin = a.getDimensionPixelSize( 4207 R.styleable.ViewGroup_MarginLayout_layout_marginBottom, 0); 4208 } 4209 4210 a.recycle(); 4211 } 4212 4213 /** 4214 * {@inheritDoc} 4215 */ 4216 public MarginLayoutParams(int width, int height) { 4217 super(width, height); 4218 } 4219 4220 /** 4221 * Copy constructor. Clones the width, height and margin values of the source. 4222 * 4223 * @param source The layout params to copy from. 4224 */ 4225 public MarginLayoutParams(MarginLayoutParams source) { 4226 this.width = source.width; 4227 this.height = source.height; 4228 4229 this.leftMargin = source.leftMargin; 4230 this.topMargin = source.topMargin; 4231 this.rightMargin = source.rightMargin; 4232 this.bottomMargin = source.bottomMargin; 4233 } 4234 4235 /** 4236 * {@inheritDoc} 4237 */ 4238 public MarginLayoutParams(LayoutParams source) { 4239 super(source); 4240 } 4241 4242 /** 4243 * Sets the margins, in pixels. 4244 * 4245 * @param left the left margin size 4246 * @param top the top margin size 4247 * @param right the right margin size 4248 * @param bottom the bottom margin size 4249 * 4250 * @attr ref android.R.styleable#ViewGroup_MarginLayout_layout_marginLeft 4251 * @attr ref android.R.styleable#ViewGroup_MarginLayout_layout_marginTop 4252 * @attr ref android.R.styleable#ViewGroup_MarginLayout_layout_marginRight 4253 * @attr ref android.R.styleable#ViewGroup_MarginLayout_layout_marginBottom 4254 */ 4255 public void setMargins(int left, int top, int right, int bottom) { 4256 leftMargin = left; 4257 topMargin = top; 4258 rightMargin = right; 4259 bottomMargin = bottom; 4260 } 4261 } 4262 4263 private static class SplitMotionTargets { 4264 private SparseArray<View> mTargets; 4265 private TargetInfo[] mUniqueTargets; 4266 private int mUniqueTargetCount; 4267 private MotionEvent.PointerCoords[] mPointerCoords; 4268 private int[] mPointerIds; 4269 4270 private static final int INITIAL_UNIQUE_MOTION_TARGETS_SIZE = 5; 4271 private static final int INITIAL_BUCKET_SIZE = 5; 4272 4273 public SplitMotionTargets() { 4274 mTargets = new SparseArray<View>(); 4275 mUniqueTargets = new TargetInfo[INITIAL_UNIQUE_MOTION_TARGETS_SIZE]; 4276 mPointerIds = new int[INITIAL_BUCKET_SIZE]; 4277 mPointerCoords = new MotionEvent.PointerCoords[INITIAL_BUCKET_SIZE]; 4278 for (int i = 0; i < INITIAL_BUCKET_SIZE; i++) { 4279 mPointerCoords[i] = new MotionEvent.PointerCoords(); 4280 } 4281 } 4282 4283 public void clear() { 4284 mTargets.clear(); 4285 final int count = mUniqueTargetCount; 4286 for (int i = 0; i < count; i++) { 4287 mUniqueTargets[i].recycle(); 4288 mUniqueTargets[i] = null; 4289 } 4290 mUniqueTargetCount = 0; 4291 } 4292 4293 public void add(int pointerId, View target, long downTime) { 4294 mTargets.put(pointerId, target); 4295 4296 final int uniqueCount = mUniqueTargetCount; 4297 boolean addUnique = true; 4298 for (int i = 0; i < uniqueCount; i++) { 4299 if (mUniqueTargets[i].view == target) { 4300 addUnique = false; 4301 } 4302 } 4303 if (addUnique) { 4304 if (mUniqueTargets.length == uniqueCount) { 4305 TargetInfo[] newTargets = 4306 new TargetInfo[uniqueCount + INITIAL_UNIQUE_MOTION_TARGETS_SIZE]; 4307 System.arraycopy(mUniqueTargets, 0, newTargets, 0, uniqueCount); 4308 mUniqueTargets = newTargets; 4309 } 4310 mUniqueTargets[uniqueCount] = TargetInfo.obtain(target, downTime); 4311 mUniqueTargetCount++; 4312 } 4313 } 4314 4315 public int getIdCount() { 4316 return mTargets.size(); 4317 } 4318 4319 public int getUniqueTargetCount() { 4320 return mUniqueTargetCount; 4321 } 4322 4323 public TargetInfo getUniqueTargetAt(int index) { 4324 return mUniqueTargets[index]; 4325 } 4326 4327 public View get(int id) { 4328 return mTargets.get(id); 4329 } 4330 4331 public int indexOfTarget(View target) { 4332 return mTargets.indexOfValue(target); 4333 } 4334 4335 public View targetAt(int index) { 4336 return mTargets.valueAt(index); 4337 } 4338 4339 public TargetInfo getPrimaryTarget() { 4340 if (!isEmpty()) { 4341 // Find the longest-lived target 4342 long firstTime = Long.MAX_VALUE; 4343 int firstIndex = 0; 4344 final int uniqueCount = mUniqueTargetCount; 4345 for (int i = 0; i < uniqueCount; i++) { 4346 TargetInfo info = mUniqueTargets[i]; 4347 if (info.downTime < firstTime) { 4348 firstTime = info.downTime; 4349 firstIndex = i; 4350 } 4351 } 4352 return mUniqueTargets[firstIndex]; 4353 } 4354 return null; 4355 } 4356 4357 public boolean isEmpty() { 4358 return mUniqueTargetCount == 0; 4359 } 4360 4361 public void removeById(int id) { 4362 final int index = mTargets.indexOfKey(id); 4363 removeAt(index); 4364 } 4365 4366 public void removeView(View view) { 4367 int i = 0; 4368 while (i < mTargets.size()) { 4369 if (mTargets.valueAt(i) == view) { 4370 mTargets.removeAt(i); 4371 } else { 4372 i++; 4373 } 4374 } 4375 removeUnique(view); 4376 } 4377 4378 public void removeAt(int index) { 4379 if (index < 0 || index >= mTargets.size()) { 4380 return; 4381 } 4382 4383 final View removeView = mTargets.valueAt(index); 4384 mTargets.removeAt(index); 4385 if (mTargets.indexOfValue(removeView) < 0) { 4386 removeUnique(removeView); 4387 } 4388 } 4389 4390 private void removeUnique(View removeView) { 4391 TargetInfo[] unique = mUniqueTargets; 4392 int uniqueCount = mUniqueTargetCount; 4393 for (int i = 0; i < uniqueCount; i++) { 4394 if (unique[i].view == removeView) { 4395 unique[i].recycle(); 4396 unique[i] = unique[--uniqueCount]; 4397 unique[uniqueCount] = null; 4398 break; 4399 } 4400 } 4401 4402 mUniqueTargetCount = uniqueCount; 4403 } 4404 4405 /** 4406 * Return a new (obtain()ed) MotionEvent containing only data for pointers that should 4407 * be dispatched to child. Don't forget to recycle it! 4408 */ 4409 public MotionEvent filterMotionEventForChild(MotionEvent ev, View child, long downTime) { 4410 int action = ev.getAction(); 4411 final int maskedAction = action & MotionEvent.ACTION_MASK; 4412 4413 // Only send pointer up events if this child was the target. Drop it otherwise. 4414 if (maskedAction == MotionEvent.ACTION_POINTER_UP && 4415 get(ev.getPointerId(ev.getActionIndex())) != child) { 4416 return null; 4417 } 4418 4419 int pointerCount = 0; 4420 final int idCount = getIdCount(); 4421 for (int i = 0; i < idCount; i++) { 4422 if (targetAt(i) == child) { 4423 pointerCount++; 4424 } 4425 } 4426 4427 int actionId = -1; 4428 boolean needsNewIndex = false; // True if we should fill in the action's masked index 4429 4430 // If we have a down event, it wasn't counted above. 4431 if (maskedAction == MotionEvent.ACTION_DOWN) { 4432 pointerCount++; 4433 actionId = ev.getPointerId(0); 4434 } else if (maskedAction == MotionEvent.ACTION_POINTER_DOWN) { 4435 pointerCount++; 4436 4437 actionId = ev.getPointerId(ev.getActionIndex()); 4438 4439 if (indexOfTarget(child) < 0) { 4440 // The new action should be ACTION_DOWN if this child isn't currently getting 4441 // any events. 4442 action = MotionEvent.ACTION_DOWN; 4443 } else { 4444 // Fill in the index portion of the action later. 4445 needsNewIndex = true; 4446 } 4447 } else if (maskedAction == MotionEvent.ACTION_POINTER_UP) { 4448 actionId = ev.getPointerId(ev.getActionIndex()); 4449 if (pointerCount == 1) { 4450 // The new action should be ACTION_UP if there's only one pointer left for 4451 // this target. 4452 action = MotionEvent.ACTION_UP; 4453 } else { 4454 // Fill in the index portion of the action later. 4455 needsNewIndex = true; 4456 } 4457 } 4458 4459 if (pointerCount == 0) { 4460 return null; 4461 } 4462 4463 // Fill the buckets with pointer data! 4464 final int eventPointerCount = ev.getPointerCount(); 4465 int bucketIndex = 0; 4466 int newActionIndex = -1; 4467 for (int evp = 0; evp < eventPointerCount; evp++) { 4468 final int id = ev.getPointerId(evp); 4469 4470 // Add this pointer to the bucket if it is new or targeted at child 4471 if (id == actionId || get(id) == child) { 4472 // Expand scratch arrays if needed 4473 if (mPointerCoords.length <= bucketIndex) { 4474 int[] pointerIds = new int[pointerCount]; 4475 MotionEvent.PointerCoords[] pointerCoords = 4476 new MotionEvent.PointerCoords[pointerCount]; 4477 for (int i = mPointerCoords.length; i < pointerCoords.length; i++) { 4478 pointerCoords[i] = new MotionEvent.PointerCoords(); 4479 } 4480 4481 System.arraycopy(mPointerCoords, 0, 4482 pointerCoords, 0, mPointerCoords.length); 4483 System.arraycopy(mPointerIds, 0, pointerIds, 0, mPointerIds.length); 4484 4485 mPointerCoords = pointerCoords; 4486 mPointerIds = pointerIds; 4487 } 4488 4489 mPointerIds[bucketIndex] = id; 4490 ev.getPointerCoords(evp, mPointerCoords[bucketIndex]); 4491 4492 if (needsNewIndex && id == actionId) { 4493 newActionIndex = bucketIndex; 4494 } 4495 4496 bucketIndex++; 4497 } 4498 } 4499 4500 // Encode the new action index if we have one 4501 if (newActionIndex >= 0) { 4502 action = (action & MotionEvent.ACTION_MASK) | 4503 (newActionIndex << MotionEvent.ACTION_POINTER_INDEX_SHIFT); 4504 } 4505 4506 return MotionEvent.obtain(downTime, ev.getEventTime(), 4507 action, pointerCount, mPointerIds, mPointerCoords, ev.getMetaState(), 4508 ev.getXPrecision(), ev.getYPrecision(), ev.getDeviceId(), ev.getEdgeFlags(), 4509 ev.getSource(), ev.getFlags()); 4510 } 4511 4512 static class TargetInfo { 4513 public View view; 4514 public long downTime; 4515 4516 private TargetInfo mNextRecycled; 4517 4518 private static TargetInfo sRecycleBin; 4519 private static int sRecycledCount; 4520 4521 private static int MAX_RECYCLED = 15; 4522 4523 private TargetInfo() { 4524 } 4525 4526 public static TargetInfo obtain(View v, long time) { 4527 TargetInfo info; 4528 if (sRecycleBin == null) { 4529 info = new TargetInfo(); 4530 } else { 4531 info = sRecycleBin; 4532 sRecycleBin = info.mNextRecycled; 4533 sRecycledCount--; 4534 } 4535 info.view = v; 4536 info.downTime = time; 4537 return info; 4538 } 4539 4540 public void recycle() { 4541 if (sRecycledCount >= MAX_RECYCLED) { 4542 return; 4543 } 4544 mNextRecycled = sRecycleBin; 4545 sRecycleBin = this; 4546 sRecycledCount++; 4547 } 4548 } 4549 } 4550} 4551